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axmol/3rdparty/simdjson/simdjson.cpp

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/* auto-generated on 2024-03-10 13:24:07 -0400. Do not edit! */
/* including simdjson.cpp: */
/* begin file simdjson.cpp */
#define SIMDJSON_SRC_SIMDJSON_CPP
/* including base.h: #include <base.h> */
/* begin file base.h */
#ifndef SIMDJSON_SRC_BASE_H
#define SIMDJSON_SRC_BASE_H
/* including simdjson/base.h: #include <simdjson/base.h> */
/* begin file simdjson/base.h */
/**
* @file Base declarations for all simdjson headers
* @private
*/
#ifndef SIMDJSON_BASE_H
#define SIMDJSON_BASE_H
/* including simdjson/common_defs.h: #include "simdjson/common_defs.h" */
/* begin file simdjson/common_defs.h */
#ifndef SIMDJSON_COMMON_DEFS_H
#define SIMDJSON_COMMON_DEFS_H
#include <cassert>
/* including simdjson/compiler_check.h: #include "simdjson/compiler_check.h" */
/* begin file simdjson/compiler_check.h */
#ifndef SIMDJSON_COMPILER_CHECK_H
#define SIMDJSON_COMPILER_CHECK_H
#ifndef __cplusplus
#error simdjson requires a C++ compiler
#endif
#ifndef SIMDJSON_CPLUSPLUS
#if defined(_MSVC_LANG) && !defined(__clang__)
#define SIMDJSON_CPLUSPLUS (_MSC_VER == 1900 ? 201103L : _MSVC_LANG)
#else
#define SIMDJSON_CPLUSPLUS __cplusplus
#endif
#endif
// C++ 17
#if !defined(SIMDJSON_CPLUSPLUS17) && (SIMDJSON_CPLUSPLUS >= 201703L)
#define SIMDJSON_CPLUSPLUS17 1
#endif
// C++ 14
#if !defined(SIMDJSON_CPLUSPLUS14) && (SIMDJSON_CPLUSPLUS >= 201402L)
#define SIMDJSON_CPLUSPLUS14 1
#endif
// C++ 11
#if !defined(SIMDJSON_CPLUSPLUS11) && (SIMDJSON_CPLUSPLUS >= 201103L)
#define SIMDJSON_CPLUSPLUS11 1
#endif
#ifndef SIMDJSON_CPLUSPLUS11
#error simdjson requires a compiler compliant with the C++11 standard
#endif
#ifndef SIMDJSON_IF_CONSTEXPR
#if SIMDJSON_CPLUSPLUS17
#define SIMDJSON_IF_CONSTEXPR if constexpr
#else
#define SIMDJSON_IF_CONSTEXPR if
#endif
#endif
#endif // SIMDJSON_COMPILER_CHECK_H
/* end file simdjson/compiler_check.h */
/* including simdjson/portability.h: #include "simdjson/portability.h" */
/* begin file simdjson/portability.h */
#ifndef SIMDJSON_PORTABILITY_H
#define SIMDJSON_PORTABILITY_H
#include <cstddef>
#include <cstdint>
#include <cstdlib>
#include <cfloat>
#include <cassert>
#ifndef _WIN32
// strcasecmp, strncasecmp
#include <strings.h>
#endif
#ifdef _MSC_VER
#define SIMDJSON_VISUAL_STUDIO 1
/**
* We want to differentiate carefully between
* clang under visual studio and regular visual
* studio.
*
* Under clang for Windows, we enable:
* * target pragmas so that part and only part of the
* code gets compiled for advanced instructions.
*
*/
#ifdef __clang__
// clang under visual studio
#define SIMDJSON_CLANG_VISUAL_STUDIO 1
#else
// just regular visual studio (best guess)
#define SIMDJSON_REGULAR_VISUAL_STUDIO 1
#endif // __clang__
#endif // _MSC_VER
#if defined(__x86_64__) || defined(_M_AMD64)
#define SIMDJSON_IS_X86_64 1
#elif defined(__aarch64__) || defined(_M_ARM64)
#define SIMDJSON_IS_ARM64 1
#elif defined(__riscv) && __riscv_xlen == 64
#define SIMDJSON_IS_RISCV64 1
#elif defined(__loongarch_lp64)
#define SIMDJSON_IS_LOONGARCH64 1
#elif defined(__PPC64__) || defined(_M_PPC64)
#if defined(__ALTIVEC__)
#define SIMDJSON_IS_PPC64_VMX 1
#endif // defined(__ALTIVEC__)
#else
#define SIMDJSON_IS_32BITS 1
#if defined(_M_IX86) || defined(__i386__)
#define SIMDJSON_IS_X86_32BITS 1
#elif defined(__arm__) || defined(_M_ARM)
#define SIMDJSON_IS_ARM_32BITS 1
#elif defined(__PPC__) || defined(_M_PPC)
#define SIMDJSON_IS_PPC_32BITS 1
#endif
#endif // defined(__x86_64__) || defined(_M_AMD64)
#ifndef SIMDJSON_IS_32BITS
#define SIMDJSON_IS_32BITS 0
#endif
#if SIMDJSON_IS_32BITS
#ifndef SIMDJSON_NO_PORTABILITY_WARNING
// In the future, we should allow programmers
// to get warning.
#endif // SIMDJSON_NO_PORTABILITY_WARNING
#endif // SIMDJSON_IS_32BITS
#define SIMDJSON_CAT_IMPLEMENTATION_(a,...) a ## __VA_ARGS__
#define SIMDJSON_CAT(a,...) SIMDJSON_CAT_IMPLEMENTATION_(a, __VA_ARGS__)
#define SIMDJSON_STRINGIFY_IMPLEMENTATION_(a,...) #a SIMDJSON_STRINGIFY(__VA_ARGS__)
#define SIMDJSON_STRINGIFY(a,...) SIMDJSON_CAT_IMPLEMENTATION_(a, __VA_ARGS__)
// this is almost standard?
#undef SIMDJSON_STRINGIFY_IMPLEMENTATION_
#undef SIMDJSON_STRINGIFY
#define SIMDJSON_STRINGIFY_IMPLEMENTATION_(a) #a
#define SIMDJSON_STRINGIFY(a) SIMDJSON_STRINGIFY_IMPLEMENTATION_(a)
// Our fast kernels require 64-bit systems.
//
// On 32-bit x86, we lack 64-bit popcnt, lzcnt, blsr instructions.
// Furthermore, the number of SIMD registers is reduced.
//
// On 32-bit ARM, we would have smaller registers.
//
// The simdjson users should still have the fallback kernel. It is
// slower, but it should run everywhere.
//
// Enable valid runtime implementations, and select SIMDJSON_BUILTIN_IMPLEMENTATION
//
// We are going to use runtime dispatch.
#if SIMDJSON_IS_X86_64
#ifdef __clang__
// clang does not have GCC push pop
// warning: clang attribute push can't be used within a namespace in clang up
// til 8.0 so SIMDJSON_TARGET_REGION and SIMDJSON_UNTARGET_REGION must be *outside* of a
// namespace.
#define SIMDJSON_TARGET_REGION(T) \
_Pragma(SIMDJSON_STRINGIFY( \
clang attribute push(__attribute__((target(T))), apply_to = function)))
#define SIMDJSON_UNTARGET_REGION _Pragma("clang attribute pop")
#elif defined(__GNUC__)
// GCC is easier
#define SIMDJSON_TARGET_REGION(T) \
_Pragma("GCC push_options") _Pragma(SIMDJSON_STRINGIFY(GCC target(T)))
#define SIMDJSON_UNTARGET_REGION _Pragma("GCC pop_options")
#endif // clang then gcc
#endif // x86
// Default target region macros don't do anything.
#ifndef SIMDJSON_TARGET_REGION
#define SIMDJSON_TARGET_REGION(T)
#define SIMDJSON_UNTARGET_REGION
#endif
// Is threading enabled?
#if defined(_REENTRANT) || defined(_MT)
#ifndef SIMDJSON_THREADS_ENABLED
#define SIMDJSON_THREADS_ENABLED
#endif
#endif
// workaround for large stack sizes under -O0.
// https://github.com/simdjson/simdjson/issues/691
#ifdef __APPLE__
#ifndef __OPTIMIZE__
// Apple systems have small stack sizes in secondary threads.
// Lack of compiler optimization may generate high stack usage.
// Users may want to disable threads for safety, but only when
// in debug mode which we detect by the fact that the __OPTIMIZE__
// macro is not defined.
#undef SIMDJSON_THREADS_ENABLED
#endif
#endif
#if defined(__clang__)
#define SIMDJSON_NO_SANITIZE_UNDEFINED __attribute__((no_sanitize("undefined")))
#elif defined(__GNUC__)
#define SIMDJSON_NO_SANITIZE_UNDEFINED __attribute__((no_sanitize_undefined))
#else
#define SIMDJSON_NO_SANITIZE_UNDEFINED
#endif
#if defined(__clang__) || defined(__GNUC__)
#if defined(__has_feature)
# if __has_feature(memory_sanitizer)
#define SIMDJSON_NO_SANITIZE_MEMORY __attribute__((no_sanitize("memory")))
# endif // if __has_feature(memory_sanitizer)
#endif // defined(__has_feature)
#endif
// make sure it is defined as 'nothing' if it is unapplicable.
#ifndef SIMDJSON_NO_SANITIZE_MEMORY
#define SIMDJSON_NO_SANITIZE_MEMORY
#endif
#if SIMDJSON_VISUAL_STUDIO
// This is one case where we do not distinguish between
// regular visual studio and clang under visual studio.
// clang under Windows has _stricmp (like visual studio) but not strcasecmp (as clang normally has)
#define simdjson_strcasecmp _stricmp
#define simdjson_strncasecmp _strnicmp
#else
// The strcasecmp, strncasecmp, and strcasestr functions do not work with multibyte strings (e.g. UTF-8).
// So they are only useful for ASCII in our context.
// https://www.gnu.org/software/libunistring/manual/libunistring.html#char-_002a-strings
#define simdjson_strcasecmp strcasecmp
#define simdjson_strncasecmp strncasecmp
#endif
#if defined(NDEBUG) || defined(__OPTIMIZE__) || (defined(_MSC_VER) && !defined(_DEBUG))
// If NDEBUG is set, or __OPTIMIZE__ is set, or we are under MSVC in release mode,
// then do away with asserts and use __assume.
#if SIMDJSON_VISUAL_STUDIO
#define SIMDJSON_UNREACHABLE() __assume(0)
#define SIMDJSON_ASSUME(COND) __assume(COND)
#else
#define SIMDJSON_UNREACHABLE() __builtin_unreachable();
#define SIMDJSON_ASSUME(COND) do { if (!(COND)) __builtin_unreachable(); } while (0)
#endif
#else // defined(NDEBUG) || defined(__OPTIMIZE__) || (defined(_MSC_VER) && !defined(_DEBUG))
// This should only ever be enabled in debug mode.
#define SIMDJSON_UNREACHABLE() assert(0);
#define SIMDJSON_ASSUME(COND) assert(COND)
#endif
#endif // SIMDJSON_PORTABILITY_H
/* end file simdjson/portability.h */
namespace simdjson {
namespace internal {
/**
* @private
* Our own implementation of the C++17 to_chars function.
* Defined in src/to_chars
*/
char *to_chars(char *first, const char *last, double value);
/**
* @private
* A number parsing routine.
* Defined in src/from_chars
*/
double from_chars(const char *first) noexcept;
double from_chars(const char *first, const char* end) noexcept;
}
#ifndef SIMDJSON_EXCEPTIONS
#if __cpp_exceptions
#define SIMDJSON_EXCEPTIONS 1
#else
#define SIMDJSON_EXCEPTIONS 0
#endif
#endif
} // namespace simdjson
#if defined(__GNUC__)
// Marks a block with a name so that MCA analysis can see it.
#define SIMDJSON_BEGIN_DEBUG_BLOCK(name) __asm volatile("# LLVM-MCA-BEGIN " #name);
#define SIMDJSON_END_DEBUG_BLOCK(name) __asm volatile("# LLVM-MCA-END " #name);
#define SIMDJSON_DEBUG_BLOCK(name, block) BEGIN_DEBUG_BLOCK(name); block; END_DEBUG_BLOCK(name);
#else
#define SIMDJSON_BEGIN_DEBUG_BLOCK(name)
#define SIMDJSON_END_DEBUG_BLOCK(name)
#define SIMDJSON_DEBUG_BLOCK(name, block)
#endif
// Align to N-byte boundary
#define SIMDJSON_ROUNDUP_N(a, n) (((a) + ((n)-1)) & ~((n)-1))
#define SIMDJSON_ROUNDDOWN_N(a, n) ((a) & ~((n)-1))
#define SIMDJSON_ISALIGNED_N(ptr, n) (((uintptr_t)(ptr) & ((n)-1)) == 0)
#if SIMDJSON_REGULAR_VISUAL_STUDIO
#define simdjson_really_inline __forceinline
#define simdjson_never_inline __declspec(noinline)
#define simdjson_unused
#define simdjson_warn_unused
#ifndef simdjson_likely
#define simdjson_likely(x) x
#endif
#ifndef simdjson_unlikely
#define simdjson_unlikely(x) x
#endif
#define SIMDJSON_PUSH_DISABLE_WARNINGS __pragma(warning( push ))
#define SIMDJSON_PUSH_DISABLE_ALL_WARNINGS __pragma(warning( push, 0 ))
#define SIMDJSON_DISABLE_VS_WARNING(WARNING_NUMBER) __pragma(warning( disable : WARNING_NUMBER ))
// Get rid of Intellisense-only warnings (Code Analysis)
// Though __has_include is C++17, it is supported in Visual Studio 2017 or better (_MSC_VER>=1910).
#ifdef __has_include
#if __has_include(<CppCoreCheck\Warnings.h>)
#include <CppCoreCheck\Warnings.h>
#define SIMDJSON_DISABLE_UNDESIRED_WARNINGS SIMDJSON_DISABLE_VS_WARNING(ALL_CPPCORECHECK_WARNINGS)
#endif
#endif
#ifndef SIMDJSON_DISABLE_UNDESIRED_WARNINGS
#define SIMDJSON_DISABLE_UNDESIRED_WARNINGS
#endif
#define SIMDJSON_DISABLE_DEPRECATED_WARNING SIMDJSON_DISABLE_VS_WARNING(4996)
#define SIMDJSON_DISABLE_STRICT_OVERFLOW_WARNING
#define SIMDJSON_POP_DISABLE_WARNINGS __pragma(warning( pop ))
#define SIMDJSON_PUSH_DISABLE_UNUSED_WARNINGS
#define SIMDJSON_POP_DISABLE_UNUSED_WARNINGS
#else // SIMDJSON_REGULAR_VISUAL_STUDIO
#define simdjson_really_inline inline __attribute__((always_inline))
#define simdjson_never_inline inline __attribute__((noinline))
#define simdjson_unused __attribute__((unused))
#define simdjson_warn_unused __attribute__((warn_unused_result))
#ifndef simdjson_likely
#define simdjson_likely(x) __builtin_expect(!!(x), 1)
#endif
#ifndef simdjson_unlikely
#define simdjson_unlikely(x) __builtin_expect(!!(x), 0)
#endif
#define SIMDJSON_PUSH_DISABLE_WARNINGS _Pragma("GCC diagnostic push")
// gcc doesn't seem to disable all warnings with all and extra, add warnings here as necessary
// We do it separately for clang since it has different warnings.
#ifdef __clang__
// clang is missing -Wmaybe-uninitialized.
#define SIMDJSON_PUSH_DISABLE_ALL_WARNINGS SIMDJSON_PUSH_DISABLE_WARNINGS \
SIMDJSON_DISABLE_GCC_WARNING(-Weffc++) \
SIMDJSON_DISABLE_GCC_WARNING(-Wall) \
SIMDJSON_DISABLE_GCC_WARNING(-Wconversion) \
SIMDJSON_DISABLE_GCC_WARNING(-Wextra) \
SIMDJSON_DISABLE_GCC_WARNING(-Wattributes) \
SIMDJSON_DISABLE_GCC_WARNING(-Wimplicit-fallthrough) \
SIMDJSON_DISABLE_GCC_WARNING(-Wnon-virtual-dtor) \
SIMDJSON_DISABLE_GCC_WARNING(-Wreturn-type) \
SIMDJSON_DISABLE_GCC_WARNING(-Wshadow) \
SIMDJSON_DISABLE_GCC_WARNING(-Wunused-parameter) \
SIMDJSON_DISABLE_GCC_WARNING(-Wunused-variable)
#else // __clang__
#define SIMDJSON_PUSH_DISABLE_ALL_WARNINGS SIMDJSON_PUSH_DISABLE_WARNINGS \
SIMDJSON_DISABLE_GCC_WARNING(-Weffc++) \
SIMDJSON_DISABLE_GCC_WARNING(-Wall) \
SIMDJSON_DISABLE_GCC_WARNING(-Wconversion) \
SIMDJSON_DISABLE_GCC_WARNING(-Wextra) \
SIMDJSON_DISABLE_GCC_WARNING(-Wattributes) \
SIMDJSON_DISABLE_GCC_WARNING(-Wimplicit-fallthrough) \
SIMDJSON_DISABLE_GCC_WARNING(-Wnon-virtual-dtor) \
SIMDJSON_DISABLE_GCC_WARNING(-Wreturn-type) \
SIMDJSON_DISABLE_GCC_WARNING(-Wshadow) \
SIMDJSON_DISABLE_GCC_WARNING(-Wunused-parameter) \
SIMDJSON_DISABLE_GCC_WARNING(-Wunused-variable) \
SIMDJSON_DISABLE_GCC_WARNING(-Wmaybe-uninitialized) \
SIMDJSON_DISABLE_GCC_WARNING(-Wformat-security)
#endif // __clang__
#define SIMDJSON_PRAGMA(P) _Pragma(#P)
#define SIMDJSON_DISABLE_GCC_WARNING(WARNING) SIMDJSON_PRAGMA(GCC diagnostic ignored #WARNING)
#if SIMDJSON_CLANG_VISUAL_STUDIO
#define SIMDJSON_DISABLE_UNDESIRED_WARNINGS SIMDJSON_DISABLE_GCC_WARNING(-Wmicrosoft-include)
#else
#define SIMDJSON_DISABLE_UNDESIRED_WARNINGS
#endif
#define SIMDJSON_DISABLE_DEPRECATED_WARNING SIMDJSON_DISABLE_GCC_WARNING(-Wdeprecated-declarations)
#define SIMDJSON_DISABLE_STRICT_OVERFLOW_WARNING SIMDJSON_DISABLE_GCC_WARNING(-Wstrict-overflow)
#define SIMDJSON_POP_DISABLE_WARNINGS _Pragma("GCC diagnostic pop")
#define SIMDJSON_PUSH_DISABLE_UNUSED_WARNINGS SIMDJSON_PUSH_DISABLE_WARNINGS \
SIMDJSON_DISABLE_GCC_WARNING(-Wunused)
#define SIMDJSON_POP_DISABLE_UNUSED_WARNINGS SIMDJSON_POP_DISABLE_WARNINGS
#endif // MSC_VER
#if defined(simdjson_inline)
// Prefer the user's definition of simdjson_inline; don't define it ourselves.
#elif defined(__GNUC__) && !defined(__OPTIMIZE__)
// If optimizations are disabled, forcing inlining can lead to significant
// code bloat and high compile times. Don't use simdjson_really_inline for
// unoptimized builds.
#define simdjson_inline inline
#else
// Force inlining for most simdjson functions.
#define simdjson_inline simdjson_really_inline
#endif
#if SIMDJSON_VISUAL_STUDIO
/**
* Windows users need to do some extra work when building
* or using a dynamic library (DLL). When building, we need
* to set SIMDJSON_DLLIMPORTEXPORT to __declspec(dllexport).
* When *using* the DLL, the user needs to set
* SIMDJSON_DLLIMPORTEXPORT __declspec(dllimport).
*
* Static libraries not need require such work.
*
* It does not matter here whether you are using
* the regular visual studio or clang under visual
* studio, you still need to handle these issues.
*
* Non-Windows systems do not have this complexity.
*/
#if SIMDJSON_BUILDING_WINDOWS_DYNAMIC_LIBRARY
// We set SIMDJSON_BUILDING_WINDOWS_DYNAMIC_LIBRARY when we build a DLL under Windows.
// It should never happen that both SIMDJSON_BUILDING_WINDOWS_DYNAMIC_LIBRARY and
// SIMDJSON_USING_WINDOWS_DYNAMIC_LIBRARY are set.
#define SIMDJSON_DLLIMPORTEXPORT __declspec(dllexport)
#elif SIMDJSON_USING_WINDOWS_DYNAMIC_LIBRARY
// Windows user who call a dynamic library should set SIMDJSON_USING_WINDOWS_DYNAMIC_LIBRARY to 1.
#define SIMDJSON_DLLIMPORTEXPORT __declspec(dllimport)
#else
// We assume by default static linkage
#define SIMDJSON_DLLIMPORTEXPORT
#endif
/**
* Workaround for the vcpkg package manager. Only vcpkg should
* ever touch the next line. The SIMDJSON_USING_LIBRARY macro is otherwise unused.
*/
#if SIMDJSON_USING_LIBRARY
#define SIMDJSON_DLLIMPORTEXPORT __declspec(dllimport)
#endif
/**
* End of workaround for the vcpkg package manager.
*/
#else
#define SIMDJSON_DLLIMPORTEXPORT
#endif
// C++17 requires string_view.
#if SIMDJSON_CPLUSPLUS17
#define SIMDJSON_HAS_STRING_VIEW
#include <string_view> // by the standard, this has to be safe.
#endif
// This macro (__cpp_lib_string_view) has to be defined
// for C++17 and better, but if it is otherwise defined,
// we are going to assume that string_view is available
// even if we do not have C++17 support.
#ifdef __cpp_lib_string_view
#define SIMDJSON_HAS_STRING_VIEW
#endif
// Some systems have string_view even if we do not have C++17 support,
// and even if __cpp_lib_string_view is undefined, it is the case
// with Apple clang version 11.
// We must handle it. *This is important.*
#ifndef SIMDJSON_HAS_STRING_VIEW
#if defined __has_include
// do not combine the next #if with the previous one (unsafe)
#if __has_include (<string_view>)
// now it is safe to trigger the include
#include <string_view> // though the file is there, it does not follow that we got the implementation
#if defined(_LIBCPP_STRING_VIEW)
// Ah! So we under libc++ which under its Library Fundamentals Technical Specification, which preceded C++17,
// included string_view.
// This means that we have string_view *even though* we may not have C++17.
#define SIMDJSON_HAS_STRING_VIEW
#endif // _LIBCPP_STRING_VIEW
#endif // __has_include (<string_view>)
#endif // defined __has_include
#endif // def SIMDJSON_HAS_STRING_VIEW
// end of complicated but important routine to try to detect string_view.
//
// Backfill std::string_view using nonstd::string_view on systems where
// we expect that string_view is missing. Important: if we get this wrong,
// we will end up with two string_view definitions and potential trouble.
// That is why we work so hard above to avoid it.
//
#ifndef SIMDJSON_HAS_STRING_VIEW
SIMDJSON_PUSH_DISABLE_ALL_WARNINGS
/* including simdjson/nonstd/string_view.hpp: #include "simdjson/nonstd/string_view.hpp" */
/* begin file simdjson/nonstd/string_view.hpp */
// Copyright 2017-2020 by Martin Moene
//
// string-view lite, a C++17-like string_view for C++98 and later.
// For more information see https://github.com/martinmoene/string-view-lite
//
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
// #pragma once // We remove #pragma once here as it generates a warning in some cases. We rely on the include guard.
#ifndef NONSTD_SV_LITE_H_INCLUDED
#define NONSTD_SV_LITE_H_INCLUDED
#define string_view_lite_MAJOR 1
#define string_view_lite_MINOR 7
#define string_view_lite_PATCH 0
#define string_view_lite_VERSION nssv_STRINGIFY(string_view_lite_MAJOR) "." nssv_STRINGIFY(string_view_lite_MINOR) "." nssv_STRINGIFY(string_view_lite_PATCH)
#define nssv_STRINGIFY( x ) nssv_STRINGIFY_( x )
#define nssv_STRINGIFY_( x ) #x
// string-view lite configuration:
#define nssv_STRING_VIEW_DEFAULT 0
#define nssv_STRING_VIEW_NONSTD 1
#define nssv_STRING_VIEW_STD 2
// tweak header support:
#ifdef __has_include
# if __has_include(<nonstd/string_view.tweak.hpp>)
# include <nonstd/string_view.tweak.hpp>
# endif
#define nssv_HAVE_TWEAK_HEADER 1
#else
#define nssv_HAVE_TWEAK_HEADER 0
//# pragma message("string_view.hpp: Note: Tweak header not supported.")
#endif
// string_view selection and configuration:
#if !defined( nssv_CONFIG_SELECT_STRING_VIEW )
# define nssv_CONFIG_SELECT_STRING_VIEW ( nssv_HAVE_STD_STRING_VIEW ? nssv_STRING_VIEW_STD : nssv_STRING_VIEW_NONSTD )
#endif
#ifndef nssv_CONFIG_STD_SV_OPERATOR
# define nssv_CONFIG_STD_SV_OPERATOR 0
#endif
#ifndef nssv_CONFIG_USR_SV_OPERATOR
# define nssv_CONFIG_USR_SV_OPERATOR 1
#endif
#ifdef nssv_CONFIG_CONVERSION_STD_STRING
# define nssv_CONFIG_CONVERSION_STD_STRING_CLASS_METHODS nssv_CONFIG_CONVERSION_STD_STRING
# define nssv_CONFIG_CONVERSION_STD_STRING_FREE_FUNCTIONS nssv_CONFIG_CONVERSION_STD_STRING
#endif
#ifndef nssv_CONFIG_CONVERSION_STD_STRING_CLASS_METHODS
# define nssv_CONFIG_CONVERSION_STD_STRING_CLASS_METHODS 1
#endif
#ifndef nssv_CONFIG_CONVERSION_STD_STRING_FREE_FUNCTIONS
# define nssv_CONFIG_CONVERSION_STD_STRING_FREE_FUNCTIONS 1
#endif
#ifndef nssv_CONFIG_NO_STREAM_INSERTION
# define nssv_CONFIG_NO_STREAM_INSERTION 0
#endif
#ifndef nssv_CONFIG_CONSTEXPR11_STD_SEARCH
# define nssv_CONFIG_CONSTEXPR11_STD_SEARCH 1
#endif
// Control presence of exception handling (try and auto discover):
#ifndef nssv_CONFIG_NO_EXCEPTIONS
# if defined(_MSC_VER)
# include <cstddef> // for _HAS_EXCEPTIONS
# endif
# if defined(__cpp_exceptions) || defined(__EXCEPTIONS) || (_HAS_EXCEPTIONS)
# define nssv_CONFIG_NO_EXCEPTIONS 0
# else
# define nssv_CONFIG_NO_EXCEPTIONS 1
# endif
#endif
// C++ language version detection (C++23 is speculative):
// Note: VC14.0/1900 (VS2015) lacks too much from C++14.
#ifndef nssv_CPLUSPLUS
# if defined(_MSVC_LANG ) && !defined(__clang__)
# define nssv_CPLUSPLUS (_MSC_VER == 1900 ? 201103L : _MSVC_LANG )
# else
# define nssv_CPLUSPLUS __cplusplus
# endif
#endif
#define nssv_CPP98_OR_GREATER ( nssv_CPLUSPLUS >= 199711L )
#define nssv_CPP11_OR_GREATER ( nssv_CPLUSPLUS >= 201103L )
#define nssv_CPP11_OR_GREATER_ ( nssv_CPLUSPLUS >= 201103L )
#define nssv_CPP14_OR_GREATER ( nssv_CPLUSPLUS >= 201402L )
#define nssv_CPP17_OR_GREATER ( nssv_CPLUSPLUS >= 201703L )
#define nssv_CPP20_OR_GREATER ( nssv_CPLUSPLUS >= 202002L )
#define nssv_CPP23_OR_GREATER ( nssv_CPLUSPLUS >= 202300L )
// use C++17 std::string_view if available and requested:
#if nssv_CPP17_OR_GREATER && defined(__has_include )
# if __has_include( <string_view> )
# define nssv_HAVE_STD_STRING_VIEW 1
# else
# define nssv_HAVE_STD_STRING_VIEW 0
# endif
#else
# define nssv_HAVE_STD_STRING_VIEW 0
#endif
#define nssv_USES_STD_STRING_VIEW ( (nssv_CONFIG_SELECT_STRING_VIEW == nssv_STRING_VIEW_STD) || ((nssv_CONFIG_SELECT_STRING_VIEW == nssv_STRING_VIEW_DEFAULT) && nssv_HAVE_STD_STRING_VIEW) )
#define nssv_HAVE_STARTS_WITH ( nssv_CPP20_OR_GREATER || !nssv_USES_STD_STRING_VIEW )
#define nssv_HAVE_ENDS_WITH nssv_HAVE_STARTS_WITH
//
// Use C++17 std::string_view:
//
#if nssv_USES_STD_STRING_VIEW
#include <string_view>
// Extensions for std::string:
#if nssv_CONFIG_CONVERSION_STD_STRING_FREE_FUNCTIONS
namespace nonstd {
template< class CharT, class Traits, class Allocator = std::allocator<CharT> >
std::basic_string<CharT, Traits, Allocator>
to_string( std::basic_string_view<CharT, Traits> v, Allocator const & a = Allocator() )
{
return std::basic_string<CharT,Traits, Allocator>( v.begin(), v.end(), a );
}
template< class CharT, class Traits, class Allocator >
std::basic_string_view<CharT, Traits>
to_string_view( std::basic_string<CharT, Traits, Allocator> const & s )
{
return std::basic_string_view<CharT, Traits>( s.data(), s.size() );
}
// Literal operators sv and _sv:
#if nssv_CONFIG_STD_SV_OPERATOR
using namespace std::literals::string_view_literals;
#endif
#if nssv_CONFIG_USR_SV_OPERATOR
inline namespace literals {
inline namespace string_view_literals {
constexpr std::string_view operator "" _sv( const char* str, size_t len ) noexcept // (1)
{
return std::string_view{ str, len };
}
constexpr std::u16string_view operator "" _sv( const char16_t* str, size_t len ) noexcept // (2)
{
return std::u16string_view{ str, len };
}
constexpr std::u32string_view operator "" _sv( const char32_t* str, size_t len ) noexcept // (3)
{
return std::u32string_view{ str, len };
}
constexpr std::wstring_view operator "" _sv( const wchar_t* str, size_t len ) noexcept // (4)
{
return std::wstring_view{ str, len };
}
}} // namespace literals::string_view_literals
#endif // nssv_CONFIG_USR_SV_OPERATOR
} // namespace nonstd
#endif // nssv_CONFIG_CONVERSION_STD_STRING_FREE_FUNCTIONS
namespace nonstd {
using std::string_view;
using std::wstring_view;
using std::u16string_view;
using std::u32string_view;
using std::basic_string_view;
// literal "sv" and "_sv", see above
using std::operator==;
using std::operator!=;
using std::operator<;
using std::operator<=;
using std::operator>;
using std::operator>=;
using std::operator<<;
} // namespace nonstd
#else // nssv_HAVE_STD_STRING_VIEW
//
// Before C++17: use string_view lite:
//
// Compiler versions:
//
// MSVC++ 6.0 _MSC_VER == 1200 nssv_COMPILER_MSVC_VERSION == 60 (Visual Studio 6.0)
// MSVC++ 7.0 _MSC_VER == 1300 nssv_COMPILER_MSVC_VERSION == 70 (Visual Studio .NET 2002)
// MSVC++ 7.1 _MSC_VER == 1310 nssv_COMPILER_MSVC_VERSION == 71 (Visual Studio .NET 2003)
// MSVC++ 8.0 _MSC_VER == 1400 nssv_COMPILER_MSVC_VERSION == 80 (Visual Studio 2005)
// MSVC++ 9.0 _MSC_VER == 1500 nssv_COMPILER_MSVC_VERSION == 90 (Visual Studio 2008)
// MSVC++ 10.0 _MSC_VER == 1600 nssv_COMPILER_MSVC_VERSION == 100 (Visual Studio 2010)
// MSVC++ 11.0 _MSC_VER == 1700 nssv_COMPILER_MSVC_VERSION == 110 (Visual Studio 2012)
// MSVC++ 12.0 _MSC_VER == 1800 nssv_COMPILER_MSVC_VERSION == 120 (Visual Studio 2013)
// MSVC++ 14.0 _MSC_VER == 1900 nssv_COMPILER_MSVC_VERSION == 140 (Visual Studio 2015)
// MSVC++ 14.1 _MSC_VER >= 1910 nssv_COMPILER_MSVC_VERSION == 141 (Visual Studio 2017)
// MSVC++ 14.2 _MSC_VER >= 1920 nssv_COMPILER_MSVC_VERSION == 142 (Visual Studio 2019)
#if defined(_MSC_VER ) && !defined(__clang__)
# define nssv_COMPILER_MSVC_VER (_MSC_VER )
# define nssv_COMPILER_MSVC_VERSION (_MSC_VER / 10 - 10 * ( 5 + (_MSC_VER < 1900 ) ) )
#else
# define nssv_COMPILER_MSVC_VER 0
# define nssv_COMPILER_MSVC_VERSION 0
#endif
#define nssv_COMPILER_VERSION( major, minor, patch ) ( 10 * ( 10 * (major) + (minor) ) + (patch) )
#if defined( __apple_build_version__ )
# define nssv_COMPILER_APPLECLANG_VERSION nssv_COMPILER_VERSION(__clang_major__, __clang_minor__, __clang_patchlevel__)
# define nssv_COMPILER_CLANG_VERSION 0
#elif defined( __clang__ )
# define nssv_COMPILER_APPLECLANG_VERSION 0
# define nssv_COMPILER_CLANG_VERSION nssv_COMPILER_VERSION(__clang_major__, __clang_minor__, __clang_patchlevel__)
#else
# define nssv_COMPILER_APPLECLANG_VERSION 0
# define nssv_COMPILER_CLANG_VERSION 0
#endif
#if defined(__GNUC__) && !defined(__clang__)
# define nssv_COMPILER_GNUC_VERSION nssv_COMPILER_VERSION(__GNUC__, __GNUC_MINOR__, __GNUC_PATCHLEVEL__)
#else
# define nssv_COMPILER_GNUC_VERSION 0
#endif
// half-open range [lo..hi):
#define nssv_BETWEEN( v, lo, hi ) ( (lo) <= (v) && (v) < (hi) )
// Presence of language and library features:
#ifdef _HAS_CPP0X
# define nssv_HAS_CPP0X _HAS_CPP0X
#else
# define nssv_HAS_CPP0X 0
#endif
// Unless defined otherwise below, consider VC14 as C++11 for string-view-lite:
#if nssv_COMPILER_MSVC_VER >= 1900
# undef nssv_CPP11_OR_GREATER
# define nssv_CPP11_OR_GREATER 1
#endif
#define nssv_CPP11_90 (nssv_CPP11_OR_GREATER_ || nssv_COMPILER_MSVC_VER >= 1500)
#define nssv_CPP11_100 (nssv_CPP11_OR_GREATER_ || nssv_COMPILER_MSVC_VER >= 1600)
#define nssv_CPP11_110 (nssv_CPP11_OR_GREATER_ || nssv_COMPILER_MSVC_VER >= 1700)
#define nssv_CPP11_120 (nssv_CPP11_OR_GREATER_ || nssv_COMPILER_MSVC_VER >= 1800)
#define nssv_CPP11_140 (nssv_CPP11_OR_GREATER_ || nssv_COMPILER_MSVC_VER >= 1900)
#define nssv_CPP11_141 (nssv_CPP11_OR_GREATER_ || nssv_COMPILER_MSVC_VER >= 1910)
#define nssv_CPP14_000 (nssv_CPP14_OR_GREATER)
#define nssv_CPP17_000 (nssv_CPP17_OR_GREATER)
// Presence of C++11 language features:
#define nssv_HAVE_CONSTEXPR_11 nssv_CPP11_140
#define nssv_HAVE_EXPLICIT_CONVERSION nssv_CPP11_140
#define nssv_HAVE_INLINE_NAMESPACE nssv_CPP11_140
#define nssv_HAVE_IS_DEFAULT nssv_CPP11_140
#define nssv_HAVE_IS_DELETE nssv_CPP11_140
#define nssv_HAVE_NOEXCEPT nssv_CPP11_140
#define nssv_HAVE_NULLPTR nssv_CPP11_100
#define nssv_HAVE_REF_QUALIFIER nssv_CPP11_140
#define nssv_HAVE_UNICODE_LITERALS nssv_CPP11_140
#define nssv_HAVE_USER_DEFINED_LITERALS nssv_CPP11_140
#define nssv_HAVE_WCHAR16_T nssv_CPP11_100
#define nssv_HAVE_WCHAR32_T nssv_CPP11_100
#if ! ( ( nssv_CPP11_OR_GREATER && nssv_COMPILER_CLANG_VERSION ) || nssv_BETWEEN( nssv_COMPILER_CLANG_VERSION, 300, 400 ) )
# define nssv_HAVE_STD_DEFINED_LITERALS nssv_CPP11_140
#else
# define nssv_HAVE_STD_DEFINED_LITERALS 0
#endif
// Presence of C++14 language features:
#define nssv_HAVE_CONSTEXPR_14 nssv_CPP14_000
// Presence of C++17 language features:
#define nssv_HAVE_NODISCARD nssv_CPP17_000
// Presence of C++ library features:
#define nssv_HAVE_STD_HASH nssv_CPP11_120
// Presence of compiler intrinsics:
// Providing char-type specializations for compare() and length() that
// use compiler intrinsics can improve compile- and run-time performance.
//
// The challenge is in using the right combinations of builtin availability
// and its constexpr-ness.
//
// | compiler | __builtin_memcmp (constexpr) | memcmp (constexpr) |
// |----------|------------------------------|---------------------|
// | clang | 4.0 (>= 4.0 ) | any (? ) |
// | clang-a | 9.0 (>= 9.0 ) | any (? ) |
// | gcc | any (constexpr) | any (? ) |
// | msvc | >= 14.2 C++17 (>= 14.2 ) | any (? ) |
#define nssv_HAVE_BUILTIN_VER ( (nssv_CPP17_000 && nssv_COMPILER_MSVC_VERSION >= 142) || nssv_COMPILER_GNUC_VERSION > 0 || nssv_COMPILER_CLANG_VERSION >= 400 || nssv_COMPILER_APPLECLANG_VERSION >= 900 )
#define nssv_HAVE_BUILTIN_CE ( nssv_HAVE_BUILTIN_VER )
#define nssv_HAVE_BUILTIN_MEMCMP ( (nssv_HAVE_CONSTEXPR_14 && nssv_HAVE_BUILTIN_CE) || !nssv_HAVE_CONSTEXPR_14 )
#define nssv_HAVE_BUILTIN_STRLEN ( (nssv_HAVE_CONSTEXPR_11 && nssv_HAVE_BUILTIN_CE) || !nssv_HAVE_CONSTEXPR_11 )
#ifdef __has_builtin
# define nssv_HAVE_BUILTIN( x ) __has_builtin( x )
#else
# define nssv_HAVE_BUILTIN( x ) 0
#endif
#if nssv_HAVE_BUILTIN(__builtin_memcmp) || nssv_HAVE_BUILTIN_VER
# define nssv_BUILTIN_MEMCMP __builtin_memcmp
#else
# define nssv_BUILTIN_MEMCMP memcmp
#endif
#if nssv_HAVE_BUILTIN(__builtin_strlen) || nssv_HAVE_BUILTIN_VER
# define nssv_BUILTIN_STRLEN __builtin_strlen
#else
# define nssv_BUILTIN_STRLEN strlen
#endif
// C++ feature usage:
#if nssv_HAVE_CONSTEXPR_11
# define nssv_constexpr constexpr
#else
# define nssv_constexpr /*constexpr*/
#endif
#if nssv_HAVE_CONSTEXPR_14
# define nssv_constexpr14 constexpr
#else
# define nssv_constexpr14 /*constexpr*/
#endif
#if nssv_HAVE_EXPLICIT_CONVERSION
# define nssv_explicit explicit
#else
# define nssv_explicit /*explicit*/
#endif
#if nssv_HAVE_INLINE_NAMESPACE
# define nssv_inline_ns inline
#else
# define nssv_inline_ns /*inline*/
#endif
#if nssv_HAVE_NOEXCEPT
# define nssv_noexcept noexcept
#else
# define nssv_noexcept /*noexcept*/
#endif
//#if nssv_HAVE_REF_QUALIFIER
//# define nssv_ref_qual &
//# define nssv_refref_qual &&
//#else
//# define nssv_ref_qual /*&*/
//# define nssv_refref_qual /*&&*/
//#endif
#if nssv_HAVE_NULLPTR
# define nssv_nullptr nullptr
#else
# define nssv_nullptr NULL
#endif
#if nssv_HAVE_NODISCARD
# define nssv_nodiscard [[nodiscard]]
#else
# define nssv_nodiscard /*[[nodiscard]]*/
#endif
// Additional includes:
#include <algorithm>
#include <cassert>
#include <iterator>
#include <limits>
#include <string> // std::char_traits<>
#if ! nssv_CONFIG_NO_STREAM_INSERTION
# include <ostream>
#endif
#if ! nssv_CONFIG_NO_EXCEPTIONS
# include <stdexcept>
#endif
#if nssv_CPP11_OR_GREATER
# include <type_traits>
#endif
// Clang, GNUC, MSVC warning suppression macros:
#if defined(__clang__)
# pragma clang diagnostic ignored "-Wreserved-user-defined-literal"
# pragma clang diagnostic push
# pragma clang diagnostic ignored "-Wuser-defined-literals"
#elif nssv_COMPILER_GNUC_VERSION >= 480
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Wliteral-suffix"
#endif // __clang__
#if nssv_COMPILER_MSVC_VERSION >= 140
# define nssv_SUPPRESS_MSGSL_WARNING(expr) [[gsl::suppress(expr)]]
# define nssv_SUPPRESS_MSVC_WARNING(code, descr) __pragma(warning(suppress: code) )
# define nssv_DISABLE_MSVC_WARNINGS(codes) __pragma(warning(push)) __pragma(warning(disable: codes))
#else
# define nssv_SUPPRESS_MSGSL_WARNING(expr)
# define nssv_SUPPRESS_MSVC_WARNING(code, descr)
# define nssv_DISABLE_MSVC_WARNINGS(codes)
#endif
#if defined(__clang__)
# define nssv_RESTORE_WARNINGS() _Pragma("clang diagnostic pop")
#elif nssv_COMPILER_GNUC_VERSION >= 480
# define nssv_RESTORE_WARNINGS() _Pragma("GCC diagnostic pop")
#elif nssv_COMPILER_MSVC_VERSION >= 140
# define nssv_RESTORE_WARNINGS() __pragma(warning(pop ))
#else
# define nssv_RESTORE_WARNINGS()
#endif
// Suppress the following MSVC (GSL) warnings:
// - C4455, non-gsl : 'operator ""sv': literal suffix identifiers that do not
// start with an underscore are reserved
// - C26472, gsl::t.1 : don't use a static_cast for arithmetic conversions;
// use brace initialization, gsl::narrow_cast or gsl::narow
// - C26481: gsl::b.1 : don't use pointer arithmetic. Use span instead
nssv_DISABLE_MSVC_WARNINGS( 4455 26481 26472 )
//nssv_DISABLE_CLANG_WARNINGS( "-Wuser-defined-literals" )
//nssv_DISABLE_GNUC_WARNINGS( -Wliteral-suffix )
namespace nonstd { namespace sv_lite {
//
// basic_string_view declaration:
//
template
<
class CharT,
class Traits = std::char_traits<CharT>
>
class basic_string_view;
namespace detail {
// support constexpr comparison in C++14;
// for C++17 and later, use provided traits:
template< typename CharT >
inline nssv_constexpr14 int compare( CharT const * s1, CharT const * s2, std::size_t count )
{
while ( count-- != 0 )
{
if ( *s1 < *s2 ) return -1;
if ( *s1 > *s2 ) return +1;
++s1; ++s2;
}
return 0;
}
#if nssv_HAVE_BUILTIN_MEMCMP
// specialization of compare() for char, see also generic compare() above:
inline nssv_constexpr14 int compare( char const * s1, char const * s2, std::size_t count )
{
return nssv_BUILTIN_MEMCMP( s1, s2, count );
}
#endif
#if nssv_HAVE_BUILTIN_STRLEN
// specialization of length() for char, see also generic length() further below:
inline nssv_constexpr std::size_t length( char const * s )
{
return nssv_BUILTIN_STRLEN( s );
}
#endif
#if defined(__OPTIMIZE__)
// gcc, clang provide __OPTIMIZE__
// Expect tail call optimization to make length() non-recursive:
template< typename CharT >
inline nssv_constexpr std::size_t length( CharT * s, std::size_t result = 0 )
{
return *s == '\0' ? result : length( s + 1, result + 1 );
}
#else // OPTIMIZE
// non-recursive:
template< typename CharT >
inline nssv_constexpr14 std::size_t length( CharT * s )
{
std::size_t result = 0;
while ( *s++ != '\0' )
{
++result;
}
return result;
}
#endif // OPTIMIZE
#if nssv_CPP11_OR_GREATER && ! nssv_CPP17_OR_GREATER
#if defined(__OPTIMIZE__)
// gcc, clang provide __OPTIMIZE__
// Expect tail call optimization to make search() non-recursive:
template< class CharT, class Traits = std::char_traits<CharT> >
constexpr const CharT* search( basic_string_view<CharT, Traits> haystack, basic_string_view<CharT, Traits> needle )
{
return haystack.starts_with( needle ) ? haystack.begin() :
haystack.empty() ? haystack.end() : search( haystack.substr(1), needle );
}
#else // OPTIMIZE
// non-recursive:
#if nssv_CONFIG_CONSTEXPR11_STD_SEARCH
template< class CharT, class Traits = std::char_traits<CharT> >
constexpr const CharT* search( basic_string_view<CharT, Traits> haystack, basic_string_view<CharT, Traits> needle )
{
return std::search( haystack.begin(), haystack.end(), needle.begin(), needle.end() );
}
#else // nssv_CONFIG_CONSTEXPR11_STD_SEARCH
template< class CharT, class Traits = std::char_traits<CharT> >
nssv_constexpr14 const CharT* search( basic_string_view<CharT, Traits> haystack, basic_string_view<CharT, Traits> needle )
{
while ( needle.size() <= haystack.size() )
{
if ( haystack.starts_with(needle) )
{
return haystack.cbegin();
}
haystack = basic_string_view<CharT, Traits>{ haystack.begin() + 1, haystack.size() - 1U };
}
return haystack.cend();
}
#endif // nssv_CONFIG_CONSTEXPR11_STD_SEARCH
#endif // OPTIMIZE
#endif // nssv_CPP11_OR_GREATER && ! nssv_CPP17_OR_GREATER
} // namespace detail
//
// basic_string_view:
//
template
<
class CharT,
class Traits /* = std::char_traits<CharT> */
>
class basic_string_view
{
public:
// Member types:
typedef Traits traits_type;
typedef CharT value_type;
typedef CharT * pointer;
typedef CharT const * const_pointer;
typedef CharT & reference;
typedef CharT const & const_reference;
typedef const_pointer iterator;
typedef const_pointer const_iterator;
typedef std::reverse_iterator< const_iterator > reverse_iterator;
typedef std::reverse_iterator< const_iterator > const_reverse_iterator;
typedef std::size_t size_type;
typedef std::ptrdiff_t difference_type;
// 24.4.2.1 Construction and assignment:
nssv_constexpr basic_string_view() nssv_noexcept
: data_( nssv_nullptr )
, size_( 0 )
{}
#if nssv_CPP11_OR_GREATER
nssv_constexpr basic_string_view( basic_string_view const & other ) nssv_noexcept = default;
#else
nssv_constexpr basic_string_view( basic_string_view const & other ) nssv_noexcept
: data_( other.data_)
, size_( other.size_)
{}
#endif
nssv_constexpr basic_string_view( CharT const * s, size_type count ) nssv_noexcept // non-standard noexcept
: data_( s )
, size_( count )
{}
nssv_constexpr basic_string_view( CharT const * s) nssv_noexcept // non-standard noexcept
: data_( s )
#if nssv_CPP17_OR_GREATER
, size_( Traits::length(s) )
#elif nssv_CPP11_OR_GREATER
, size_( detail::length(s) )
#else
, size_( Traits::length(s) )
#endif
{}
#if nssv_HAVE_NULLPTR
# if nssv_HAVE_IS_DELETE
nssv_constexpr basic_string_view( std::nullptr_t ) nssv_noexcept = delete;
# else
private: nssv_constexpr basic_string_view( std::nullptr_t ) nssv_noexcept; public:
# endif
#endif
// Assignment:
#if nssv_CPP11_OR_GREATER
nssv_constexpr14 basic_string_view & operator=( basic_string_view const & other ) nssv_noexcept = default;
#else
nssv_constexpr14 basic_string_view & operator=( basic_string_view const & other ) nssv_noexcept
{
data_ = other.data_;
size_ = other.size_;
return *this;
}
#endif
// 24.4.2.2 Iterator support:
nssv_constexpr const_iterator begin() const nssv_noexcept { return data_; }
nssv_constexpr const_iterator end() const nssv_noexcept { return data_ + size_; }
nssv_constexpr const_iterator cbegin() const nssv_noexcept { return begin(); }
nssv_constexpr const_iterator cend() const nssv_noexcept { return end(); }
nssv_constexpr const_reverse_iterator rbegin() const nssv_noexcept { return const_reverse_iterator( end() ); }
nssv_constexpr const_reverse_iterator rend() const nssv_noexcept { return const_reverse_iterator( begin() ); }
nssv_constexpr const_reverse_iterator crbegin() const nssv_noexcept { return rbegin(); }
nssv_constexpr const_reverse_iterator crend() const nssv_noexcept { return rend(); }
// 24.4.2.3 Capacity:
nssv_constexpr size_type size() const nssv_noexcept { return size_; }
nssv_constexpr size_type length() const nssv_noexcept { return size_; }
nssv_constexpr size_type max_size() const nssv_noexcept { return (std::numeric_limits< size_type >::max)(); }
// since C++20
nssv_nodiscard nssv_constexpr bool empty() const nssv_noexcept
{
return 0 == size_;
}
// 24.4.2.4 Element access:
nssv_constexpr const_reference operator[]( size_type pos ) const
{
return data_at( pos );
}
nssv_constexpr14 const_reference at( size_type pos ) const
{
#if nssv_CONFIG_NO_EXCEPTIONS
assert( pos < size() );
#else
if ( pos >= size() )
{
throw std::out_of_range("nonstd::string_view::at()");
}
#endif
return data_at( pos );
}
nssv_constexpr const_reference front() const { return data_at( 0 ); }
nssv_constexpr const_reference back() const { return data_at( size() - 1 ); }
nssv_constexpr const_pointer data() const nssv_noexcept { return data_; }
// 24.4.2.5 Modifiers:
nssv_constexpr14 void remove_prefix( size_type n )
{
assert( n <= size() );
data_ += n;
size_ -= n;
}
nssv_constexpr14 void remove_suffix( size_type n )
{
assert( n <= size() );
size_ -= n;
}
nssv_constexpr14 void swap( basic_string_view & other ) nssv_noexcept
{
const basic_string_view tmp(other);
other = *this;
*this = tmp;
}
// 24.4.2.6 String operations:
size_type copy( CharT * dest, size_type n, size_type pos = 0 ) const
{
#if nssv_CONFIG_NO_EXCEPTIONS
assert( pos <= size() );
#else
if ( pos > size() )
{
throw std::out_of_range("nonstd::string_view::copy()");
}
#endif
const size_type rlen = (std::min)( n, size() - pos );
(void) Traits::copy( dest, data() + pos, rlen );
return rlen;
}
nssv_constexpr14 basic_string_view substr( size_type pos = 0, size_type n = npos ) const
{
#if nssv_CONFIG_NO_EXCEPTIONS
assert( pos <= size() );
#else
if ( pos > size() )
{
throw std::out_of_range("nonstd::string_view::substr()");
}
#endif
return basic_string_view( data() + pos, (std::min)( n, size() - pos ) );
}
// compare(), 6x:
nssv_constexpr14 int compare( basic_string_view other ) const nssv_noexcept // (1)
{
#if nssv_CPP17_OR_GREATER
if ( const int result = Traits::compare( data(), other.data(), (std::min)( size(), other.size() ) ) )
#else
if ( const int result = detail::compare( data(), other.data(), (std::min)( size(), other.size() ) ) )
#endif
{
return result;
}
return size() == other.size() ? 0 : size() < other.size() ? -1 : 1;
}
nssv_constexpr int compare( size_type pos1, size_type n1, basic_string_view other ) const // (2)
{
return substr( pos1, n1 ).compare( other );
}
nssv_constexpr int compare( size_type pos1, size_type n1, basic_string_view other, size_type pos2, size_type n2 ) const // (3)
{
return substr( pos1, n1 ).compare( other.substr( pos2, n2 ) );
}
nssv_constexpr int compare( CharT const * s ) const // (4)
{
return compare( basic_string_view( s ) );
}
nssv_constexpr int compare( size_type pos1, size_type n1, CharT const * s ) const // (5)
{
return substr( pos1, n1 ).compare( basic_string_view( s ) );
}
nssv_constexpr int compare( size_type pos1, size_type n1, CharT const * s, size_type n2 ) const // (6)
{
return substr( pos1, n1 ).compare( basic_string_view( s, n2 ) );
}
// 24.4.2.7 Searching:
// starts_with(), 3x, since C++20:
nssv_constexpr bool starts_with( basic_string_view v ) const nssv_noexcept // (1)
{
return size() >= v.size() && compare( 0, v.size(), v ) == 0;
}
nssv_constexpr bool starts_with( CharT c ) const nssv_noexcept // (2)
{
return starts_with( basic_string_view( &c, 1 ) );
}
nssv_constexpr bool starts_with( CharT const * s ) const // (3)
{
return starts_with( basic_string_view( s ) );
}
// ends_with(), 3x, since C++20:
nssv_constexpr bool ends_with( basic_string_view v ) const nssv_noexcept // (1)
{
return size() >= v.size() && compare( size() - v.size(), npos, v ) == 0;
}
nssv_constexpr bool ends_with( CharT c ) const nssv_noexcept // (2)
{
return ends_with( basic_string_view( &c, 1 ) );
}
nssv_constexpr bool ends_with( CharT const * s ) const // (3)
{
return ends_with( basic_string_view( s ) );
}
// find(), 4x:
nssv_constexpr14 size_type find( basic_string_view v, size_type pos = 0 ) const nssv_noexcept // (1)
{
return assert( v.size() == 0 || v.data() != nssv_nullptr )
, pos >= size()
? npos : to_pos(
#if nssv_CPP11_OR_GREATER && ! nssv_CPP17_OR_GREATER
detail::search( substr(pos), v )
#else
std::search( cbegin() + pos, cend(), v.cbegin(), v.cend(), Traits::eq )
#endif
);
}
nssv_constexpr size_type find( CharT c, size_type pos = 0 ) const nssv_noexcept // (2)
{
return find( basic_string_view( &c, 1 ), pos );
}
nssv_constexpr size_type find( CharT const * s, size_type pos, size_type n ) const // (3)
{
return find( basic_string_view( s, n ), pos );
}
nssv_constexpr size_type find( CharT const * s, size_type pos = 0 ) const // (4)
{
return find( basic_string_view( s ), pos );
}
// rfind(), 4x:
nssv_constexpr14 size_type rfind( basic_string_view v, size_type pos = npos ) const nssv_noexcept // (1)
{
if ( size() < v.size() )
{
return npos;
}
if ( v.empty() )
{
return (std::min)( size(), pos );
}
const_iterator last = cbegin() + (std::min)( size() - v.size(), pos ) + v.size();
const_iterator result = std::find_end( cbegin(), last, v.cbegin(), v.cend(), Traits::eq );
return result != last ? size_type( result - cbegin() ) : npos;
}
nssv_constexpr14 size_type rfind( CharT c, size_type pos = npos ) const nssv_noexcept // (2)
{
return rfind( basic_string_view( &c, 1 ), pos );
}
nssv_constexpr14 size_type rfind( CharT const * s, size_type pos, size_type n ) const // (3)
{
return rfind( basic_string_view( s, n ), pos );
}
nssv_constexpr14 size_type rfind( CharT const * s, size_type pos = npos ) const // (4)
{
return rfind( basic_string_view( s ), pos );
}
// find_first_of(), 4x:
nssv_constexpr size_type find_first_of( basic_string_view v, size_type pos = 0 ) const nssv_noexcept // (1)
{
return pos >= size()
? npos
: to_pos( std::find_first_of( cbegin() + pos, cend(), v.cbegin(), v.cend(), Traits::eq ) );
}
nssv_constexpr size_type find_first_of( CharT c, size_type pos = 0 ) const nssv_noexcept // (2)
{
return find_first_of( basic_string_view( &c, 1 ), pos );
}
nssv_constexpr size_type find_first_of( CharT const * s, size_type pos, size_type n ) const // (3)
{
return find_first_of( basic_string_view( s, n ), pos );
}
nssv_constexpr size_type find_first_of( CharT const * s, size_type pos = 0 ) const // (4)
{
return find_first_of( basic_string_view( s ), pos );
}
// find_last_of(), 4x:
nssv_constexpr size_type find_last_of( basic_string_view v, size_type pos = npos ) const nssv_noexcept // (1)
{
return empty()
? npos
: pos >= size()
? find_last_of( v, size() - 1 )
: to_pos( std::find_first_of( const_reverse_iterator( cbegin() + pos + 1 ), crend(), v.cbegin(), v.cend(), Traits::eq ) );
}
nssv_constexpr size_type find_last_of( CharT c, size_type pos = npos ) const nssv_noexcept // (2)
{
return find_last_of( basic_string_view( &c, 1 ), pos );
}
nssv_constexpr size_type find_last_of( CharT const * s, size_type pos, size_type count ) const // (3)
{
return find_last_of( basic_string_view( s, count ), pos );
}
nssv_constexpr size_type find_last_of( CharT const * s, size_type pos = npos ) const // (4)
{
return find_last_of( basic_string_view( s ), pos );
}
// find_first_not_of(), 4x:
nssv_constexpr size_type find_first_not_of( basic_string_view v, size_type pos = 0 ) const nssv_noexcept // (1)
{
return pos >= size()
? npos
: to_pos( std::find_if( cbegin() + pos, cend(), not_in_view( v ) ) );
}
nssv_constexpr size_type find_first_not_of( CharT c, size_type pos = 0 ) const nssv_noexcept // (2)
{
return find_first_not_of( basic_string_view( &c, 1 ), pos );
}
nssv_constexpr size_type find_first_not_of( CharT const * s, size_type pos, size_type count ) const // (3)
{
return find_first_not_of( basic_string_view( s, count ), pos );
}
nssv_constexpr size_type find_first_not_of( CharT const * s, size_type pos = 0 ) const // (4)
{
return find_first_not_of( basic_string_view( s ), pos );
}
// find_last_not_of(), 4x:
nssv_constexpr size_type find_last_not_of( basic_string_view v, size_type pos = npos ) const nssv_noexcept // (1)
{
return empty()
? npos
: pos >= size()
? find_last_not_of( v, size() - 1 )
: to_pos( std::find_if( const_reverse_iterator( cbegin() + pos + 1 ), crend(), not_in_view( v ) ) );
}
nssv_constexpr size_type find_last_not_of( CharT c, size_type pos = npos ) const nssv_noexcept // (2)
{
return find_last_not_of( basic_string_view( &c, 1 ), pos );
}
nssv_constexpr size_type find_last_not_of( CharT const * s, size_type pos, size_type count ) const // (3)
{
return find_last_not_of( basic_string_view( s, count ), pos );
}
nssv_constexpr size_type find_last_not_of( CharT const * s, size_type pos = npos ) const // (4)
{
return find_last_not_of( basic_string_view( s ), pos );
}
// Constants:
#if nssv_CPP17_OR_GREATER
static nssv_constexpr size_type npos = size_type(-1);
#elif nssv_CPP11_OR_GREATER
enum : size_type { npos = size_type(-1) };
#else
enum { npos = size_type(-1) };
#endif
private:
struct not_in_view
{
const basic_string_view v;
nssv_constexpr explicit not_in_view( basic_string_view v_ ) : v( v_ ) {}
nssv_constexpr bool operator()( CharT c ) const
{
return npos == v.find_first_of( c );
}
};
nssv_constexpr size_type to_pos( const_iterator it ) const
{
return it == cend() ? npos : size_type( it - cbegin() );
}
nssv_constexpr size_type to_pos( const_reverse_iterator it ) const
{
return it == crend() ? npos : size_type( crend() - it - 1 );
}
nssv_constexpr const_reference data_at( size_type pos ) const
{
#if nssv_BETWEEN( nssv_COMPILER_GNUC_VERSION, 1, 500 )
return data_[pos];
#else
return assert( pos < size() ), data_[pos];
#endif
}
private:
const_pointer data_;
size_type size_;
public:
#if nssv_CONFIG_CONVERSION_STD_STRING_CLASS_METHODS
template< class Allocator >
basic_string_view( std::basic_string<CharT, Traits, Allocator> const & s ) nssv_noexcept
: data_( s.data() )
, size_( s.size() )
{}
#if nssv_HAVE_EXPLICIT_CONVERSION
template< class Allocator >
explicit operator std::basic_string<CharT, Traits, Allocator>() const
{
return to_string( Allocator() );
}
#endif // nssv_HAVE_EXPLICIT_CONVERSION
#if nssv_CPP11_OR_GREATER
template< class Allocator = std::allocator<CharT> >
std::basic_string<CharT, Traits, Allocator>
to_string( Allocator const & a = Allocator() ) const
{
return std::basic_string<CharT, Traits, Allocator>( begin(), end(), a );
}
#else
std::basic_string<CharT, Traits>
to_string() const
{
return std::basic_string<CharT, Traits>( begin(), end() );
}
template< class Allocator >
std::basic_string<CharT, Traits, Allocator>
to_string( Allocator const & a ) const
{
return std::basic_string<CharT, Traits, Allocator>( begin(), end(), a );
}
#endif // nssv_CPP11_OR_GREATER
#endif // nssv_CONFIG_CONVERSION_STD_STRING_CLASS_METHODS
};
//
// Non-member functions:
//
// 24.4.3 Non-member comparison functions:
// lexicographically compare two string views (function template):
template< class CharT, class Traits >
nssv_constexpr bool operator== (
basic_string_view <CharT, Traits> lhs,
basic_string_view <CharT, Traits> rhs ) nssv_noexcept
{ return lhs.size() == rhs.size() && lhs.compare( rhs ) == 0; }
template< class CharT, class Traits >
nssv_constexpr bool operator!= (
basic_string_view <CharT, Traits> lhs,
basic_string_view <CharT, Traits> rhs ) nssv_noexcept
{ return !( lhs == rhs ); }
template< class CharT, class Traits >
nssv_constexpr bool operator< (
basic_string_view <CharT, Traits> lhs,
basic_string_view <CharT, Traits> rhs ) nssv_noexcept
{ return lhs.compare( rhs ) < 0; }
template< class CharT, class Traits >
nssv_constexpr bool operator<= (
basic_string_view <CharT, Traits> lhs,
basic_string_view <CharT, Traits> rhs ) nssv_noexcept
{ return lhs.compare( rhs ) <= 0; }
template< class CharT, class Traits >
nssv_constexpr bool operator> (
basic_string_view <CharT, Traits> lhs,
basic_string_view <CharT, Traits> rhs ) nssv_noexcept
{ return lhs.compare( rhs ) > 0; }
template< class CharT, class Traits >
nssv_constexpr bool operator>= (
basic_string_view <CharT, Traits> lhs,
basic_string_view <CharT, Traits> rhs ) nssv_noexcept
{ return lhs.compare( rhs ) >= 0; }
// Let S be basic_string_view<CharT, Traits>, and sv be an instance of S.
// Implementations shall provide sufficient additional overloads marked
// constexpr and noexcept so that an object t with an implicit conversion
// to S can be compared according to Table 67.
#if ! nssv_CPP11_OR_GREATER || nssv_BETWEEN( nssv_COMPILER_MSVC_VERSION, 100, 141 )
// accommodate for older compilers:
// ==
template< class CharT, class Traits>
nssv_constexpr bool operator==(
basic_string_view<CharT, Traits> lhs,
CharT const * rhs ) nssv_noexcept
{ return lhs.size() == detail::length( rhs ) && lhs.compare( rhs ) == 0; }
template< class CharT, class Traits>
nssv_constexpr bool operator==(
CharT const * lhs,
basic_string_view<CharT, Traits> rhs ) nssv_noexcept
{ return detail::length( lhs ) == rhs.size() && rhs.compare( lhs ) == 0; }
template< class CharT, class Traits>
nssv_constexpr bool operator==(
basic_string_view<CharT, Traits> lhs,
std::basic_string<CharT, Traits> rhs ) nssv_noexcept
{ return lhs.size() == rhs.size() && lhs.compare( rhs ) == 0; }
template< class CharT, class Traits>
nssv_constexpr bool operator==(
std::basic_string<CharT, Traits> rhs,
basic_string_view<CharT, Traits> lhs ) nssv_noexcept
{ return lhs.size() == rhs.size() && lhs.compare( rhs ) == 0; }
// !=
template< class CharT, class Traits>
nssv_constexpr bool operator!=(
basic_string_view<CharT, Traits> lhs,
CharT const * rhs ) nssv_noexcept
{ return !( lhs == rhs ); }
template< class CharT, class Traits>
nssv_constexpr bool operator!=(
CharT const * lhs,
basic_string_view<CharT, Traits> rhs ) nssv_noexcept
{ return !( lhs == rhs ); }
template< class CharT, class Traits>
nssv_constexpr bool operator!=(
basic_string_view<CharT, Traits> lhs,
std::basic_string<CharT, Traits> rhs ) nssv_noexcept
{ return !( lhs == rhs ); }
template< class CharT, class Traits>
nssv_constexpr bool operator!=(
std::basic_string<CharT, Traits> rhs,
basic_string_view<CharT, Traits> lhs ) nssv_noexcept
{ return !( lhs == rhs ); }
// <
template< class CharT, class Traits>
nssv_constexpr bool operator<(
basic_string_view<CharT, Traits> lhs,
CharT const * rhs ) nssv_noexcept
{ return lhs.compare( rhs ) < 0; }
template< class CharT, class Traits>
nssv_constexpr bool operator<(
CharT const * lhs,
basic_string_view<CharT, Traits> rhs ) nssv_noexcept
{ return rhs.compare( lhs ) > 0; }
template< class CharT, class Traits>
nssv_constexpr bool operator<(
basic_string_view<CharT, Traits> lhs,
std::basic_string<CharT, Traits> rhs ) nssv_noexcept
{ return lhs.compare( rhs ) < 0; }
template< class CharT, class Traits>
nssv_constexpr bool operator<(
std::basic_string<CharT, Traits> rhs,
basic_string_view<CharT, Traits> lhs ) nssv_noexcept
{ return rhs.compare( lhs ) > 0; }
// <=
template< class CharT, class Traits>
nssv_constexpr bool operator<=(
basic_string_view<CharT, Traits> lhs,
CharT const * rhs ) nssv_noexcept
{ return lhs.compare( rhs ) <= 0; }
template< class CharT, class Traits>
nssv_constexpr bool operator<=(
CharT const * lhs,
basic_string_view<CharT, Traits> rhs ) nssv_noexcept
{ return rhs.compare( lhs ) >= 0; }
template< class CharT, class Traits>
nssv_constexpr bool operator<=(
basic_string_view<CharT, Traits> lhs,
std::basic_string<CharT, Traits> rhs ) nssv_noexcept
{ return lhs.compare( rhs ) <= 0; }
template< class CharT, class Traits>
nssv_constexpr bool operator<=(
std::basic_string<CharT, Traits> rhs,
basic_string_view<CharT, Traits> lhs ) nssv_noexcept
{ return rhs.compare( lhs ) >= 0; }
// >
template< class CharT, class Traits>
nssv_constexpr bool operator>(
basic_string_view<CharT, Traits> lhs,
CharT const * rhs ) nssv_noexcept
{ return lhs.compare( rhs ) > 0; }
template< class CharT, class Traits>
nssv_constexpr bool operator>(
CharT const * lhs,
basic_string_view<CharT, Traits> rhs ) nssv_noexcept
{ return rhs.compare( lhs ) < 0; }
template< class CharT, class Traits>
nssv_constexpr bool operator>(
basic_string_view<CharT, Traits> lhs,
std::basic_string<CharT, Traits> rhs ) nssv_noexcept
{ return lhs.compare( rhs ) > 0; }
template< class CharT, class Traits>
nssv_constexpr bool operator>(
std::basic_string<CharT, Traits> rhs,
basic_string_view<CharT, Traits> lhs ) nssv_noexcept
{ return rhs.compare( lhs ) < 0; }
// >=
template< class CharT, class Traits>
nssv_constexpr bool operator>=(
basic_string_view<CharT, Traits> lhs,
CharT const * rhs ) nssv_noexcept
{ return lhs.compare( rhs ) >= 0; }
template< class CharT, class Traits>
nssv_constexpr bool operator>=(
CharT const * lhs,
basic_string_view<CharT, Traits> rhs ) nssv_noexcept
{ return rhs.compare( lhs ) <= 0; }
template< class CharT, class Traits>
nssv_constexpr bool operator>=(
basic_string_view<CharT, Traits> lhs,
std::basic_string<CharT, Traits> rhs ) nssv_noexcept
{ return lhs.compare( rhs ) >= 0; }
template< class CharT, class Traits>
nssv_constexpr bool operator>=(
std::basic_string<CharT, Traits> rhs,
basic_string_view<CharT, Traits> lhs ) nssv_noexcept
{ return rhs.compare( lhs ) <= 0; }
#else // newer compilers:
#define nssv_BASIC_STRING_VIEW_I(T,U) typename std::decay< basic_string_view<T,U> >::type
#if defined(_MSC_VER) // issue 40
# define nssv_MSVC_ORDER(x) , int=x
#else
# define nssv_MSVC_ORDER(x) /*, int=x*/
#endif
// ==
template< class CharT, class Traits nssv_MSVC_ORDER(1) >
nssv_constexpr bool operator==(
basic_string_view <CharT, Traits> lhs,
nssv_BASIC_STRING_VIEW_I(CharT, Traits) rhs ) nssv_noexcept
{ return lhs.size() == rhs.size() && lhs.compare( rhs ) == 0; }
template< class CharT, class Traits nssv_MSVC_ORDER(2) >
nssv_constexpr bool operator==(
nssv_BASIC_STRING_VIEW_I(CharT, Traits) lhs,
basic_string_view <CharT, Traits> rhs ) nssv_noexcept
{ return lhs.size() == rhs.size() && lhs.compare( rhs ) == 0; }
// !=
template< class CharT, class Traits nssv_MSVC_ORDER(1) >
nssv_constexpr bool operator!= (
basic_string_view < CharT, Traits > lhs,
nssv_BASIC_STRING_VIEW_I( CharT, Traits ) rhs ) nssv_noexcept
{ return !( lhs == rhs ); }
template< class CharT, class Traits nssv_MSVC_ORDER(2) >
nssv_constexpr bool operator!= (
nssv_BASIC_STRING_VIEW_I( CharT, Traits ) lhs,
basic_string_view < CharT, Traits > rhs ) nssv_noexcept
{ return !( lhs == rhs ); }
// <
template< class CharT, class Traits nssv_MSVC_ORDER(1) >
nssv_constexpr bool operator< (
basic_string_view < CharT, Traits > lhs,
nssv_BASIC_STRING_VIEW_I( CharT, Traits ) rhs ) nssv_noexcept
{ return lhs.compare( rhs ) < 0; }
template< class CharT, class Traits nssv_MSVC_ORDER(2) >
nssv_constexpr bool operator< (
nssv_BASIC_STRING_VIEW_I( CharT, Traits ) lhs,
basic_string_view < CharT, Traits > rhs ) nssv_noexcept
{ return lhs.compare( rhs ) < 0; }
// <=
template< class CharT, class Traits nssv_MSVC_ORDER(1) >
nssv_constexpr bool operator<= (
basic_string_view < CharT, Traits > lhs,
nssv_BASIC_STRING_VIEW_I( CharT, Traits ) rhs ) nssv_noexcept
{ return lhs.compare( rhs ) <= 0; }
template< class CharT, class Traits nssv_MSVC_ORDER(2) >
nssv_constexpr bool operator<= (
nssv_BASIC_STRING_VIEW_I( CharT, Traits ) lhs,
basic_string_view < CharT, Traits > rhs ) nssv_noexcept
{ return lhs.compare( rhs ) <= 0; }
// >
template< class CharT, class Traits nssv_MSVC_ORDER(1) >
nssv_constexpr bool operator> (
basic_string_view < CharT, Traits > lhs,
nssv_BASIC_STRING_VIEW_I( CharT, Traits ) rhs ) nssv_noexcept
{ return lhs.compare( rhs ) > 0; }
template< class CharT, class Traits nssv_MSVC_ORDER(2) >
nssv_constexpr bool operator> (
nssv_BASIC_STRING_VIEW_I( CharT, Traits ) lhs,
basic_string_view < CharT, Traits > rhs ) nssv_noexcept
{ return lhs.compare( rhs ) > 0; }
// >=
template< class CharT, class Traits nssv_MSVC_ORDER(1) >
nssv_constexpr bool operator>= (
basic_string_view < CharT, Traits > lhs,
nssv_BASIC_STRING_VIEW_I( CharT, Traits ) rhs ) nssv_noexcept
{ return lhs.compare( rhs ) >= 0; }
template< class CharT, class Traits nssv_MSVC_ORDER(2) >
nssv_constexpr bool operator>= (
nssv_BASIC_STRING_VIEW_I( CharT, Traits ) lhs,
basic_string_view < CharT, Traits > rhs ) nssv_noexcept
{ return lhs.compare( rhs ) >= 0; }
#undef nssv_MSVC_ORDER
#undef nssv_BASIC_STRING_VIEW_I
#endif // compiler-dependent approach to comparisons
// 24.4.4 Inserters and extractors:
#if ! nssv_CONFIG_NO_STREAM_INSERTION
namespace detail {
template< class Stream >
void write_padding( Stream & os, std::streamsize n )
{
for ( std::streamsize i = 0; i < n; ++i )
os.rdbuf()->sputc( os.fill() );
}
template< class Stream, class View >
Stream & write_to_stream( Stream & os, View const & sv )
{
typename Stream::sentry sentry( os );
if ( !sentry )
return os;
const std::streamsize length = static_cast<std::streamsize>( sv.length() );
// Whether, and how, to pad:
const bool pad = ( length < os.width() );
const bool left_pad = pad && ( os.flags() & std::ios_base::adjustfield ) == std::ios_base::right;
if ( left_pad )
write_padding( os, os.width() - length );
// Write span characters:
os.rdbuf()->sputn( sv.begin(), length );
if ( pad && !left_pad )
write_padding( os, os.width() - length );
// Reset output stream width:
os.width( 0 );
return os;
}
} // namespace detail
template< class CharT, class Traits >
std::basic_ostream<CharT, Traits> &
operator<<(
std::basic_ostream<CharT, Traits>& os,
basic_string_view <CharT, Traits> sv )
{
return detail::write_to_stream( os, sv );
}
#endif // nssv_CONFIG_NO_STREAM_INSERTION
// Several typedefs for common character types are provided:
typedef basic_string_view<char> string_view;
typedef basic_string_view<wchar_t> wstring_view;
#if nssv_HAVE_WCHAR16_T
typedef basic_string_view<char16_t> u16string_view;
typedef basic_string_view<char32_t> u32string_view;
#endif
}} // namespace nonstd::sv_lite
//
// 24.4.6 Suffix for basic_string_view literals:
//
#if nssv_HAVE_USER_DEFINED_LITERALS
namespace nonstd {
nssv_inline_ns namespace literals {
nssv_inline_ns namespace string_view_literals {
#if nssv_CONFIG_STD_SV_OPERATOR && nssv_HAVE_STD_DEFINED_LITERALS
nssv_constexpr nonstd::sv_lite::string_view operator "" sv( const char* str, size_t len ) nssv_noexcept // (1)
{
return nonstd::sv_lite::string_view{ str, len };
}
nssv_constexpr nonstd::sv_lite::u16string_view operator "" sv( const char16_t* str, size_t len ) nssv_noexcept // (2)
{
return nonstd::sv_lite::u16string_view{ str, len };
}
nssv_constexpr nonstd::sv_lite::u32string_view operator "" sv( const char32_t* str, size_t len ) nssv_noexcept // (3)
{
return nonstd::sv_lite::u32string_view{ str, len };
}
nssv_constexpr nonstd::sv_lite::wstring_view operator "" sv( const wchar_t* str, size_t len ) nssv_noexcept // (4)
{
return nonstd::sv_lite::wstring_view{ str, len };
}
#endif // nssv_CONFIG_STD_SV_OPERATOR && nssv_HAVE_STD_DEFINED_LITERALS
#if nssv_CONFIG_USR_SV_OPERATOR
nssv_constexpr nonstd::sv_lite::string_view operator "" _sv( const char* str, size_t len ) nssv_noexcept // (1)
{
return nonstd::sv_lite::string_view{ str, len };
}
nssv_constexpr nonstd::sv_lite::u16string_view operator "" _sv( const char16_t* str, size_t len ) nssv_noexcept // (2)
{
return nonstd::sv_lite::u16string_view{ str, len };
}
nssv_constexpr nonstd::sv_lite::u32string_view operator "" _sv( const char32_t* str, size_t len ) nssv_noexcept // (3)
{
return nonstd::sv_lite::u32string_view{ str, len };
}
nssv_constexpr nonstd::sv_lite::wstring_view operator "" _sv( const wchar_t* str, size_t len ) nssv_noexcept // (4)
{
return nonstd::sv_lite::wstring_view{ str, len };
}
#endif // nssv_CONFIG_USR_SV_OPERATOR
}}} // namespace nonstd::literals::string_view_literals
#endif
//
// Extensions for std::string:
//
#if nssv_CONFIG_CONVERSION_STD_STRING_FREE_FUNCTIONS
namespace nonstd {
namespace sv_lite {
// Exclude MSVC 14 (19.00): it yields ambiguous to_string():
#if nssv_CPP11_OR_GREATER && nssv_COMPILER_MSVC_VERSION != 140
template< class CharT, class Traits, class Allocator = std::allocator<CharT> >
std::basic_string<CharT, Traits, Allocator>
to_string( basic_string_view<CharT, Traits> v, Allocator const & a = Allocator() )
{
return std::basic_string<CharT,Traits, Allocator>( v.begin(), v.end(), a );
}
#else
template< class CharT, class Traits >
std::basic_string<CharT, Traits>
to_string( basic_string_view<CharT, Traits> v )
{
return std::basic_string<CharT, Traits>( v.begin(), v.end() );
}
template< class CharT, class Traits, class Allocator >
std::basic_string<CharT, Traits, Allocator>
to_string( basic_string_view<CharT, Traits> v, Allocator const & a )
{
return std::basic_string<CharT, Traits, Allocator>( v.begin(), v.end(), a );
}
#endif // nssv_CPP11_OR_GREATER
template< class CharT, class Traits, class Allocator >
basic_string_view<CharT, Traits>
to_string_view( std::basic_string<CharT, Traits, Allocator> const & s )
{
return basic_string_view<CharT, Traits>( s.data(), s.size() );
}
}} // namespace nonstd::sv_lite
#endif // nssv_CONFIG_CONVERSION_STD_STRING_FREE_FUNCTIONS
//
// make types and algorithms available in namespace nonstd:
//
namespace nonstd {
using sv_lite::basic_string_view;
using sv_lite::string_view;
using sv_lite::wstring_view;
#if nssv_HAVE_WCHAR16_T
using sv_lite::u16string_view;
#endif
#if nssv_HAVE_WCHAR32_T
using sv_lite::u32string_view;
#endif
// literal "sv"
using sv_lite::operator==;
using sv_lite::operator!=;
using sv_lite::operator<;
using sv_lite::operator<=;
using sv_lite::operator>;
using sv_lite::operator>=;
#if ! nssv_CONFIG_NO_STREAM_INSERTION
using sv_lite::operator<<;
#endif
#if nssv_CONFIG_CONVERSION_STD_STRING_FREE_FUNCTIONS
using sv_lite::to_string;
using sv_lite::to_string_view;
#endif
} // namespace nonstd
// 24.4.5 Hash support (C++11):
// Note: The hash value of a string view object is equal to the hash value of
// the corresponding string object.
#if nssv_HAVE_STD_HASH
#include <functional>
namespace std {
template<>
struct hash< nonstd::string_view >
{
public:
std::size_t operator()( nonstd::string_view v ) const nssv_noexcept
{
return std::hash<std::string>()( std::string( v.data(), v.size() ) );
}
};
template<>
struct hash< nonstd::wstring_view >
{
public:
std::size_t operator()( nonstd::wstring_view v ) const nssv_noexcept
{
return std::hash<std::wstring>()( std::wstring( v.data(), v.size() ) );
}
};
template<>
struct hash< nonstd::u16string_view >
{
public:
std::size_t operator()( nonstd::u16string_view v ) const nssv_noexcept
{
return std::hash<std::u16string>()( std::u16string( v.data(), v.size() ) );
}
};
template<>
struct hash< nonstd::u32string_view >
{
public:
std::size_t operator()( nonstd::u32string_view v ) const nssv_noexcept
{
return std::hash<std::u32string>()( std::u32string( v.data(), v.size() ) );
}
};
} // namespace std
#endif // nssv_HAVE_STD_HASH
nssv_RESTORE_WARNINGS()
#endif // nssv_HAVE_STD_STRING_VIEW
#endif // NONSTD_SV_LITE_H_INCLUDED
/* end file simdjson/nonstd/string_view.hpp */
SIMDJSON_POP_DISABLE_WARNINGS
namespace std {
using string_view = nonstd::string_view;
}
#endif // SIMDJSON_HAS_STRING_VIEW
#undef SIMDJSON_HAS_STRING_VIEW // We are not going to need this macro anymore.
/// If EXPR is an error, returns it.
#define SIMDJSON_TRY(EXPR) { auto _err = (EXPR); if (_err) { return _err; } }
// Unless the programmer has already set SIMDJSON_DEVELOPMENT_CHECKS,
// we want to set it under debug builds. We detect a debug build
// under Visual Studio when the _DEBUG macro is set. Under the other
// compilers, we use the fact that they define __OPTIMIZE__ whenever
// they allow optimizations.
// It is possible that this could miss some cases where SIMDJSON_DEVELOPMENT_CHECKS
// is helpful, but the programmer can set the macro SIMDJSON_DEVELOPMENT_CHECKS.
// It could also wrongly set SIMDJSON_DEVELOPMENT_CHECKS (e.g., if the programmer
// sets _DEBUG in a release build under Visual Studio, or if some compiler fails to
// set the __OPTIMIZE__ macro).
#ifndef SIMDJSON_DEVELOPMENT_CHECKS
#ifdef _MSC_VER
// Visual Studio seems to set _DEBUG for debug builds.
#ifdef _DEBUG
#define SIMDJSON_DEVELOPMENT_CHECKS 1
#endif // _DEBUG
#else // _MSC_VER
// All other compilers appear to set __OPTIMIZE__ to a positive integer
// when the compiler is optimizing.
#ifndef __OPTIMIZE__
#define SIMDJSON_DEVELOPMENT_CHECKS 1
#endif // __OPTIMIZE__
#endif // _MSC_VER
#endif // SIMDJSON_DEVELOPMENT_CHECKS
// The SIMDJSON_CHECK_EOF macro is a feature flag for the "don't require padding"
// feature.
#if SIMDJSON_CPLUSPLUS17
// if we have C++, then fallthrough is a default attribute
# define simdjson_fallthrough [[fallthrough]]
// check if we have __attribute__ support
#elif defined(__has_attribute)
// check if we have the __fallthrough__ attribute
#if __has_attribute(__fallthrough__)
// we are good to go:
# define simdjson_fallthrough __attribute__((__fallthrough__))
#endif // __has_attribute(__fallthrough__)
#endif // SIMDJSON_CPLUSPLUS17
// on some systems, we simply do not have support for fallthrough, so use a default:
#ifndef simdjson_fallthrough
# define simdjson_fallthrough do {} while (0) /* fallthrough */
#endif // simdjson_fallthrough
#if SIMDJSON_DEVELOPMENT_CHECKS
#define SIMDJSON_DEVELOPMENT_ASSERT(expr) do { assert ((expr)); } while (0)
#else
#define SIMDJSON_DEVELOPMENT_ASSERT(expr) do { } while (0)
#endif
#ifndef SIMDJSON_UTF8VALIDATION
#define SIMDJSON_UTF8VALIDATION 1
#endif
#ifdef __has_include
// How do we detect that a compiler supports vbmi2?
// For sure if the following header is found, we are ok?
#if __has_include(<avx512vbmi2intrin.h>)
#define SIMDJSON_COMPILER_SUPPORTS_VBMI2 1
#endif
#endif
#ifdef _MSC_VER
#if _MSC_VER >= 1920
// Visual Studio 2019 and up support VBMI2 under x64 even if the header
// avx512vbmi2intrin.h is not found.
#define SIMDJSON_COMPILER_SUPPORTS_VBMI2 1
#endif
#endif
// By default, we allow AVX512.
#ifndef SIMDJSON_AVX512_ALLOWED
#define SIMDJSON_AVX512_ALLOWED 1
#endif
#endif // SIMDJSON_COMMON_DEFS_H
/* end file simdjson/common_defs.h */
/* skipped duplicate #include "simdjson/compiler_check.h" */
/* including simdjson/error.h: #include "simdjson/error.h" */
/* begin file simdjson/error.h */
#ifndef SIMDJSON_ERROR_H
#define SIMDJSON_ERROR_H
/* skipped duplicate #include "simdjson/base.h" */
#include <string>
#include <ostream>
namespace simdjson {
/**
* All possible errors returned by simdjson. These error codes are subject to change
* and not all simdjson kernel returns the same error code given the same input: it is not
* well defined which error a given input should produce.
*
* Only SUCCESS evaluates to false as a Boolean. All other error codes will evaluate
* to true as a Boolean.
*/
enum error_code {
SUCCESS = 0, ///< No error
CAPACITY, ///< This parser can't support a document that big
MEMALLOC, ///< Error allocating memory, most likely out of memory
TAPE_ERROR, ///< Something went wrong, this is a generic error
DEPTH_ERROR, ///< Your document exceeds the user-specified depth limitation
STRING_ERROR, ///< Problem while parsing a string
T_ATOM_ERROR, ///< Problem while parsing an atom starting with the letter 't'
F_ATOM_ERROR, ///< Problem while parsing an atom starting with the letter 'f'
N_ATOM_ERROR, ///< Problem while parsing an atom starting with the letter 'n'
NUMBER_ERROR, ///< Problem while parsing a number
BIGINT_ERROR, ///< The integer value exceeds 64 bits
UTF8_ERROR, ///< the input is not valid UTF-8
UNINITIALIZED, ///< unknown error, or uninitialized document
EMPTY, ///< no structural element found
UNESCAPED_CHARS, ///< found unescaped characters in a string.
UNCLOSED_STRING, ///< missing quote at the end
UNSUPPORTED_ARCHITECTURE, ///< unsupported architecture
INCORRECT_TYPE, ///< JSON element has a different type than user expected
NUMBER_OUT_OF_RANGE, ///< JSON number does not fit in 64 bits
INDEX_OUT_OF_BOUNDS, ///< JSON array index too large
NO_SUCH_FIELD, ///< JSON field not found in object
IO_ERROR, ///< Error reading a file
INVALID_JSON_POINTER, ///< Invalid JSON pointer reference
INVALID_URI_FRAGMENT, ///< Invalid URI fragment
UNEXPECTED_ERROR, ///< indicative of a bug in simdjson
PARSER_IN_USE, ///< parser is already in use.
OUT_OF_ORDER_ITERATION, ///< tried to iterate an array or object out of order (checked when SIMDJSON_DEVELOPMENT_CHECKS=1)
INSUFFICIENT_PADDING, ///< The JSON doesn't have enough padding for simdjson to safely parse it.
INCOMPLETE_ARRAY_OR_OBJECT, ///< The document ends early.
SCALAR_DOCUMENT_AS_VALUE, ///< A scalar document is treated as a value.
OUT_OF_BOUNDS, ///< Attempted to access location outside of document.
TRAILING_CONTENT, ///< Unexpected trailing content in the JSON input
NUM_ERROR_CODES
};
/**
* It is the convention throughout the code that the macro SIMDJSON_DEVELOPMENT_CHECKS determines whether
* we check for OUT_OF_ORDER_ITERATION. The logic behind it is that these errors only occurs when the code
* that was written while breaking some simdjson::ondemand requirement. They should not occur in released
* code after these issues were fixed.
*/
/**
* Get the error message for the given error code.
*
* dom::parser parser;
* dom::element doc;
* auto error = parser.parse("foo",3).get(doc);
* if (error) { printf("Error: %s\n", error_message(error)); }
*
* @return The error message.
*/
inline const char *error_message(error_code error) noexcept;
/**
* Write the error message to the output stream
*/
inline std::ostream& operator<<(std::ostream& out, error_code error) noexcept;
/**
* Exception thrown when an exception-supporting simdjson method is called
*/
struct simdjson_error : public std::exception {
/**
* Create an exception from a simdjson error code.
* @param error The error code
*/
simdjson_error(error_code error) noexcept : _error{error} { }
/** The error message */
const char *what() const noexcept { return error_message(error()); }
/** The error code */
error_code error() const noexcept { return _error; }
private:
/** The error code that was used */
error_code _error;
};
namespace internal {
/**
* The result of a simdjson operation that could fail.
*
* Gives the option of reading error codes, or throwing an exception by casting to the desired result.
*
* This is a base class for implementations that want to add functions to the result type for
* chaining.
*
* Override like:
*
* struct simdjson_result<T> : public internal::simdjson_result_base<T> {
* simdjson_result() noexcept : internal::simdjson_result_base<T>() {}
* simdjson_result(error_code error) noexcept : internal::simdjson_result_base<T>(error) {}
* simdjson_result(T &&value) noexcept : internal::simdjson_result_base<T>(std::forward(value)) {}
* simdjson_result(T &&value, error_code error) noexcept : internal::simdjson_result_base<T>(value, error) {}
* // Your extra methods here
* }
*
* Then any method returning simdjson_result<T> will be chainable with your methods.
*/
template<typename T>
struct simdjson_result_base : protected std::pair<T, error_code> {
/**
* Create a new empty result with error = UNINITIALIZED.
*/
simdjson_inline simdjson_result_base() noexcept;
/**
* Create a new error result.
*/
simdjson_inline simdjson_result_base(error_code error) noexcept;
/**
* Create a new successful result.
*/
simdjson_inline simdjson_result_base(T &&value) noexcept;
/**
* Create a new result with both things (use if you don't want to branch when creating the result).
*/
simdjson_inline simdjson_result_base(T &&value, error_code error) noexcept;
/**
* Move the value and the error to the provided variables.
*
* @param value The variable to assign the value to. May not be set if there is an error.
* @param error The variable to assign the error to. Set to SUCCESS if there is no error.
*/
simdjson_inline void tie(T &value, error_code &error) && noexcept;
/**
* Move the value to the provided variable.
*
* @param value The variable to assign the value to. May not be set if there is an error.
*/
simdjson_inline error_code get(T &value) && noexcept;
/**
* The error.
*/
simdjson_inline error_code error() const noexcept;
#if SIMDJSON_EXCEPTIONS
/**
* Get the result value.
*
* @throw simdjson_error if there was an error.
*/
simdjson_inline T& value() & noexcept(false);
/**
* Take the result value (move it).
*
* @throw simdjson_error if there was an error.
*/
simdjson_inline T&& value() && noexcept(false);
/**
* Take the result value (move it).
*
* @throw simdjson_error if there was an error.
*/
simdjson_inline T&& take_value() && noexcept(false);
/**
* Cast to the value (will throw on error).
*
* @throw simdjson_error if there was an error.
*/
simdjson_inline operator T&&() && noexcept(false);
#endif // SIMDJSON_EXCEPTIONS
/**
* Get the result value. This function is safe if and only
* the error() method returns a value that evaluates to false.
*/
simdjson_inline const T& value_unsafe() const& noexcept;
/**
* Take the result value (move it). This function is safe if and only
* the error() method returns a value that evaluates to false.
*/
simdjson_inline T&& value_unsafe() && noexcept;
}; // struct simdjson_result_base
} // namespace internal
/**
* The result of a simdjson operation that could fail.
*
* Gives the option of reading error codes, or throwing an exception by casting to the desired result.
*/
template<typename T>
struct simdjson_result : public internal::simdjson_result_base<T> {
/**
* @private Create a new empty result with error = UNINITIALIZED.
*/
simdjson_inline simdjson_result() noexcept;
/**
* @private Create a new successful result.
*/
simdjson_inline simdjson_result(T &&value) noexcept;
/**
* @private Create a new error result.
*/
simdjson_inline simdjson_result(error_code error_code) noexcept;
/**
* @private Create a new result with both things (use if you don't want to branch when creating the result).
*/
simdjson_inline simdjson_result(T &&value, error_code error) noexcept;
/**
* Move the value and the error to the provided variables.
*
* @param value The variable to assign the value to. May not be set if there is an error.
* @param error The variable to assign the error to. Set to SUCCESS if there is no error.
*/
simdjson_inline void tie(T &value, error_code &error) && noexcept;
/**
* Move the value to the provided variable.
*
* @param value The variable to assign the value to. May not be set if there is an error.
*/
simdjson_warn_unused simdjson_inline error_code get(T &value) && noexcept;
/**
* The error.
*/
simdjson_inline error_code error() const noexcept;
#if SIMDJSON_EXCEPTIONS
/**
* Get the result value.
*
* @throw simdjson_error if there was an error.
*/
simdjson_inline T& value() & noexcept(false);
/**
* Take the result value (move it).
*
* @throw simdjson_error if there was an error.
*/
simdjson_inline T&& value() && noexcept(false);
/**
* Take the result value (move it).
*
* @throw simdjson_error if there was an error.
*/
simdjson_inline T&& take_value() && noexcept(false);
/**
* Cast to the value (will throw on error).
*
* @throw simdjson_error if there was an error.
*/
simdjson_inline operator T&&() && noexcept(false);
#endif // SIMDJSON_EXCEPTIONS
/**
* Get the result value. This function is safe if and only
* the error() method returns a value that evaluates to false.
*/
simdjson_inline const T& value_unsafe() const& noexcept;
/**
* Take the result value (move it). This function is safe if and only
* the error() method returns a value that evaluates to false.
*/
simdjson_inline T&& value_unsafe() && noexcept;
}; // struct simdjson_result
#if SIMDJSON_EXCEPTIONS
template<typename T>
inline std::ostream& operator<<(std::ostream& out, simdjson_result<T> value) { return out << value.value(); }
#endif // SIMDJSON_EXCEPTIONS
#ifndef SIMDJSON_DISABLE_DEPRECATED_API
/**
* @deprecated This is an alias and will be removed, use error_code instead
*/
using ErrorValues [[deprecated("This is an alias and will be removed, use error_code instead")]] = error_code;
/**
* @deprecated Error codes should be stored and returned as `error_code`, use `error_message()` instead.
*/
[[deprecated("Error codes should be stored and returned as `error_code`, use `error_message()` instead.")]]
inline const std::string error_message(int error) noexcept;
#endif // SIMDJSON_DISABLE_DEPRECATED_API
} // namespace simdjson
#endif // SIMDJSON_ERROR_H
/* end file simdjson/error.h */
/* skipped duplicate #include "simdjson/portability.h" */
/**
* @brief The top level simdjson namespace, containing everything the library provides.
*/
namespace simdjson {
SIMDJSON_PUSH_DISABLE_UNUSED_WARNINGS
/** The maximum document size supported by simdjson. */
constexpr size_t SIMDJSON_MAXSIZE_BYTES = 0xFFFFFFFF;
/**
* The amount of padding needed in a buffer to parse JSON.
*
* The input buf should be readable up to buf + SIMDJSON_PADDING
* this is a stopgap; there should be a better description of the
* main loop and its behavior that abstracts over this
* See https://github.com/simdjson/simdjson/issues/174
*/
constexpr size_t SIMDJSON_PADDING = 64;
/**
* By default, simdjson supports this many nested objects and arrays.
*
* This is the default for parser::max_depth().
*/
constexpr size_t DEFAULT_MAX_DEPTH = 1024;
SIMDJSON_POP_DISABLE_UNUSED_WARNINGS
class implementation;
struct padded_string;
class padded_string_view;
enum class stage1_mode;
namespace internal {
template<typename T>
class atomic_ptr;
class dom_parser_implementation;
class escape_json_string;
class tape_ref;
struct value128;
enum class tape_type;
} // namespace internal
} // namespace simdjson
#endif // SIMDJSON_BASE_H
/* end file simdjson/base.h */
#endif // SIMDJSON_SRC_BASE_H
/* end file base.h */
SIMDJSON_PUSH_DISABLE_UNUSED_WARNINGS
/* including to_chars.cpp: #include <to_chars.cpp> */
/* begin file to_chars.cpp */
#ifndef SIMDJSON_SRC_TO_CHARS_CPP
#define SIMDJSON_SRC_TO_CHARS_CPP
/* skipped duplicate #include <base.h> */
#include <cstring>
#include <cstdint>
#include <array>
#include <cmath>
namespace simdjson {
namespace internal {
/*!
implements the Grisu2 algorithm for binary to decimal floating-point
conversion.
Adapted from JSON for Modern C++
This implementation is a slightly modified version of the reference
implementation which may be obtained from
http://florian.loitsch.com/publications (bench.tar.gz).
The code is distributed under the MIT license, Copyright (c) 2009 Florian
Loitsch. For a detailed description of the algorithm see: [1] Loitsch, "Printing
Floating-Point Numbers Quickly and Accurately with Integers", Proceedings of the
ACM SIGPLAN 2010 Conference on Programming Language Design and Implementation,
PLDI 2010 [2] Burger, Dybvig, "Printing Floating-Point Numbers Quickly and
Accurately", Proceedings of the ACM SIGPLAN 1996 Conference on Programming
Language Design and Implementation, PLDI 1996
*/
namespace dtoa_impl {
template <typename Target, typename Source>
Target reinterpret_bits(const Source source) {
static_assert(sizeof(Target) == sizeof(Source), "size mismatch");
Target target;
std::memcpy(&target, &source, sizeof(Source));
return target;
}
struct diyfp // f * 2^e
{
static constexpr int kPrecision = 64; // = q
std::uint64_t f = 0;
int e = 0;
constexpr diyfp(std::uint64_t f_, int e_) noexcept : f(f_), e(e_) {}
/*!
@brief returns x - y
@pre x.e == y.e and x.f >= y.f
*/
static diyfp sub(const diyfp &x, const diyfp &y) noexcept {
return {x.f - y.f, x.e};
}
/*!
@brief returns x * y
@note The result is rounded. (Only the upper q bits are returned.)
*/
static diyfp mul(const diyfp &x, const diyfp &y) noexcept {
static_assert(kPrecision == 64, "internal error");
// Computes:
// f = round((x.f * y.f) / 2^q)
// e = x.e + y.e + q
// Emulate the 64-bit * 64-bit multiplication:
//
// p = u * v
// = (u_lo + 2^32 u_hi) (v_lo + 2^32 v_hi)
// = (u_lo v_lo ) + 2^32 ((u_lo v_hi ) + (u_hi v_lo )) +
// 2^64 (u_hi v_hi ) = (p0 ) + 2^32 ((p1 ) + (p2 ))
// + 2^64 (p3 ) = (p0_lo + 2^32 p0_hi) + 2^32 ((p1_lo +
// 2^32 p1_hi) + (p2_lo + 2^32 p2_hi)) + 2^64 (p3 ) =
// (p0_lo ) + 2^32 (p0_hi + p1_lo + p2_lo ) + 2^64 (p1_hi +
// p2_hi + p3) = (p0_lo ) + 2^32 (Q ) + 2^64 (H ) = (p0_lo ) +
// 2^32 (Q_lo + 2^32 Q_hi ) + 2^64 (H )
//
// (Since Q might be larger than 2^32 - 1)
//
// = (p0_lo + 2^32 Q_lo) + 2^64 (Q_hi + H)
//
// (Q_hi + H does not overflow a 64-bit int)
//
// = p_lo + 2^64 p_hi
const std::uint64_t u_lo = x.f & 0xFFFFFFFFu;
const std::uint64_t u_hi = x.f >> 32u;
const std::uint64_t v_lo = y.f & 0xFFFFFFFFu;
const std::uint64_t v_hi = y.f >> 32u;
const std::uint64_t p0 = u_lo * v_lo;
const std::uint64_t p1 = u_lo * v_hi;
const std::uint64_t p2 = u_hi * v_lo;
const std::uint64_t p3 = u_hi * v_hi;
const std::uint64_t p0_hi = p0 >> 32u;
const std::uint64_t p1_lo = p1 & 0xFFFFFFFFu;
const std::uint64_t p1_hi = p1 >> 32u;
const std::uint64_t p2_lo = p2 & 0xFFFFFFFFu;
const std::uint64_t p2_hi = p2 >> 32u;
std::uint64_t Q = p0_hi + p1_lo + p2_lo;
// The full product might now be computed as
//
// p_hi = p3 + p2_hi + p1_hi + (Q >> 32)
// p_lo = p0_lo + (Q << 32)
//
// But in this particular case here, the full p_lo is not required.
// Effectively we only need to add the highest bit in p_lo to p_hi (and
// Q_hi + 1 does not overflow).
Q += std::uint64_t{1} << (64u - 32u - 1u); // round, ties up
const std::uint64_t h = p3 + p2_hi + p1_hi + (Q >> 32u);
return {h, x.e + y.e + 64};
}
/*!
@brief normalize x such that the significand is >= 2^(q-1)
@pre x.f != 0
*/
static diyfp normalize(diyfp x) noexcept {
while ((x.f >> 63u) == 0) {
x.f <<= 1u;
x.e--;
}
return x;
}
/*!
@brief normalize x such that the result has the exponent E
@pre e >= x.e and the upper e - x.e bits of x.f must be zero.
*/
static diyfp normalize_to(const diyfp &x,
const int target_exponent) noexcept {
const int delta = x.e - target_exponent;
return {x.f << delta, target_exponent};
}
};
struct boundaries {
diyfp w;
diyfp minus;
diyfp plus;
};
/*!
Compute the (normalized) diyfp representing the input number 'value' and its
boundaries.
@pre value must be finite and positive
*/
template <typename FloatType> boundaries compute_boundaries(FloatType value) {
// Convert the IEEE representation into a diyfp.
//
// If v is denormal:
// value = 0.F * 2^(1 - bias) = ( F) * 2^(1 - bias - (p-1))
// If v is normalized:
// value = 1.F * 2^(E - bias) = (2^(p-1) + F) * 2^(E - bias - (p-1))
static_assert(std::numeric_limits<FloatType>::is_iec559,
"internal error: dtoa_short requires an IEEE-754 "
"floating-point implementation");
constexpr int kPrecision =
std::numeric_limits<FloatType>::digits; // = p (includes the hidden bit)
constexpr int kBias =
std::numeric_limits<FloatType>::max_exponent - 1 + (kPrecision - 1);
constexpr int kMinExp = 1 - kBias;
constexpr std::uint64_t kHiddenBit = std::uint64_t{1}
<< (kPrecision - 1); // = 2^(p-1)
using bits_type = typename std::conditional<kPrecision == 24, std::uint32_t,
std::uint64_t>::type;
const std::uint64_t bits = reinterpret_bits<bits_type>(value);
const std::uint64_t E = bits >> (kPrecision - 1);
const std::uint64_t F = bits & (kHiddenBit - 1);
const bool is_denormal = E == 0;
const diyfp v = is_denormal
? diyfp(F, kMinExp)
: diyfp(F + kHiddenBit, static_cast<int>(E) - kBias);
// Compute the boundaries m- and m+ of the floating-point value
// v = f * 2^e.
//
// Determine v- and v+, the floating-point predecessor and successor if v,
// respectively.
//
// v- = v - 2^e if f != 2^(p-1) or e == e_min (A)
// = v - 2^(e-1) if f == 2^(p-1) and e > e_min (B)
//
// v+ = v + 2^e
//
// Let m- = (v- + v) / 2 and m+ = (v + v+) / 2. All real numbers _strictly_
// between m- and m+ round to v, regardless of how the input rounding
// algorithm breaks ties.
//
// ---+-------------+-------------+-------------+-------------+--- (A)
// v- m- v m+ v+
//
// -----------------+------+------+-------------+-------------+--- (B)
// v- m- v m+ v+
const bool lower_boundary_is_closer = F == 0 && E > 1;
const diyfp m_plus = diyfp(2 * v.f + 1, v.e - 1);
const diyfp m_minus = lower_boundary_is_closer
? diyfp(4 * v.f - 1, v.e - 2) // (B)
: diyfp(2 * v.f - 1, v.e - 1); // (A)
// Determine the normalized w+ = m+.
const diyfp w_plus = diyfp::normalize(m_plus);
// Determine w- = m- such that e_(w-) = e_(w+).
const diyfp w_minus = diyfp::normalize_to(m_minus, w_plus.e);
return {diyfp::normalize(v), w_minus, w_plus};
}
// Given normalized diyfp w, Grisu needs to find a (normalized) cached
// power-of-ten c, such that the exponent of the product c * w = f * 2^e lies
// within a certain range [alpha, gamma] (Definition 3.2 from [1])
//
// alpha <= e = e_c + e_w + q <= gamma
//
// or
//
// f_c * f_w * 2^alpha <= f_c 2^(e_c) * f_w 2^(e_w) * 2^q
// <= f_c * f_w * 2^gamma
//
// Since c and w are normalized, i.e. 2^(q-1) <= f < 2^q, this implies
//
// 2^(q-1) * 2^(q-1) * 2^alpha <= c * w * 2^q < 2^q * 2^q * 2^gamma
//
// or
//
// 2^(q - 2 + alpha) <= c * w < 2^(q + gamma)
//
// The choice of (alpha,gamma) determines the size of the table and the form of
// the digit generation procedure. Using (alpha,gamma)=(-60,-32) works out well
// in practice:
//
// The idea is to cut the number c * w = f * 2^e into two parts, which can be
// processed independently: An integral part p1, and a fractional part p2:
//
// f * 2^e = ( (f div 2^-e) * 2^-e + (f mod 2^-e) ) * 2^e
// = (f div 2^-e) + (f mod 2^-e) * 2^e
// = p1 + p2 * 2^e
//
// The conversion of p1 into decimal form requires a series of divisions and
// modulos by (a power of) 10. These operations are faster for 32-bit than for
// 64-bit integers, so p1 should ideally fit into a 32-bit integer. This can be
// achieved by choosing
//
// -e >= 32 or e <= -32 := gamma
//
// In order to convert the fractional part
//
// p2 * 2^e = p2 / 2^-e = d[-1] / 10^1 + d[-2] / 10^2 + ...
//
// into decimal form, the fraction is repeatedly multiplied by 10 and the digits
// d[-i] are extracted in order:
//
// (10 * p2) div 2^-e = d[-1]
// (10 * p2) mod 2^-e = d[-2] / 10^1 + ...
//
// The multiplication by 10 must not overflow. It is sufficient to choose
//
// 10 * p2 < 16 * p2 = 2^4 * p2 <= 2^64.
//
// Since p2 = f mod 2^-e < 2^-e,
//
// -e <= 60 or e >= -60 := alpha
constexpr int kAlpha = -60;
constexpr int kGamma = -32;
struct cached_power // c = f * 2^e ~= 10^k
{
std::uint64_t f;
int e;
int k;
};
/*!
For a normalized diyfp w = f * 2^e, this function returns a (normalized) cached
power-of-ten c = f_c * 2^e_c, such that the exponent of the product w * c
satisfies (Definition 3.2 from [1])
alpha <= e_c + e + q <= gamma.
*/
inline cached_power get_cached_power_for_binary_exponent(int e) {
// Now
//
// alpha <= e_c + e + q <= gamma (1)
// ==> f_c * 2^alpha <= c * 2^e * 2^q
//
// and since the c's are normalized, 2^(q-1) <= f_c,
//
// ==> 2^(q - 1 + alpha) <= c * 2^(e + q)
// ==> 2^(alpha - e - 1) <= c
//
// If c were an exact power of ten, i.e. c = 10^k, one may determine k as
//
// k = ceil( log_10( 2^(alpha - e - 1) ) )
// = ceil( (alpha - e - 1) * log_10(2) )
//
// From the paper:
// "In theory the result of the procedure could be wrong since c is rounded,
// and the computation itself is approximated [...]. In practice, however,
// this simple function is sufficient."
//
// For IEEE double precision floating-point numbers converted into
// normalized diyfp's w = f * 2^e, with q = 64,
//
// e >= -1022 (min IEEE exponent)
// -52 (p - 1)
// -52 (p - 1, possibly normalize denormal IEEE numbers)
// -11 (normalize the diyfp)
// = -1137
//
// and
//
// e <= +1023 (max IEEE exponent)
// -52 (p - 1)
// -11 (normalize the diyfp)
// = 960
//
// This binary exponent range [-1137,960] results in a decimal exponent
// range [-307,324]. One does not need to store a cached power for each
// k in this range. For each such k it suffices to find a cached power
// such that the exponent of the product lies in [alpha,gamma].
// This implies that the difference of the decimal exponents of adjacent
// table entries must be less than or equal to
//
// floor( (gamma - alpha) * log_10(2) ) = 8.
//
// (A smaller distance gamma-alpha would require a larger table.)
// NB:
// Actually this function returns c, such that -60 <= e_c + e + 64 <= -34.
constexpr int kCachedPowersMinDecExp = -300;
constexpr int kCachedPowersDecStep = 8;
static constexpr std::array<cached_power, 79> kCachedPowers = {{
{0xAB70FE17C79AC6CA, -1060, -300}, {0xFF77B1FCBEBCDC4F, -1034, -292},
{0xBE5691EF416BD60C, -1007, -284}, {0x8DD01FAD907FFC3C, -980, -276},
{0xD3515C2831559A83, -954, -268}, {0x9D71AC8FADA6C9B5, -927, -260},
{0xEA9C227723EE8BCB, -901, -252}, {0xAECC49914078536D, -874, -244},
{0x823C12795DB6CE57, -847, -236}, {0xC21094364DFB5637, -821, -228},
{0x9096EA6F3848984F, -794, -220}, {0xD77485CB25823AC7, -768, -212},
{0xA086CFCD97BF97F4, -741, -204}, {0xEF340A98172AACE5, -715, -196},
{0xB23867FB2A35B28E, -688, -188}, {0x84C8D4DFD2C63F3B, -661, -180},
{0xC5DD44271AD3CDBA, -635, -172}, {0x936B9FCEBB25C996, -608, -164},
{0xDBAC6C247D62A584, -582, -156}, {0xA3AB66580D5FDAF6, -555, -148},
{0xF3E2F893DEC3F126, -529, -140}, {0xB5B5ADA8AAFF80B8, -502, -132},
{0x87625F056C7C4A8B, -475, -124}, {0xC9BCFF6034C13053, -449, -116},
{0x964E858C91BA2655, -422, -108}, {0xDFF9772470297EBD, -396, -100},
{0xA6DFBD9FB8E5B88F, -369, -92}, {0xF8A95FCF88747D94, -343, -84},
{0xB94470938FA89BCF, -316, -76}, {0x8A08F0F8BF0F156B, -289, -68},
{0xCDB02555653131B6, -263, -60}, {0x993FE2C6D07B7FAC, -236, -52},
{0xE45C10C42A2B3B06, -210, -44}, {0xAA242499697392D3, -183, -36},
{0xFD87B5F28300CA0E, -157, -28}, {0xBCE5086492111AEB, -130, -20},
{0x8CBCCC096F5088CC, -103, -12}, {0xD1B71758E219652C, -77, -4},
{0x9C40000000000000, -50, 4}, {0xE8D4A51000000000, -24, 12},
{0xAD78EBC5AC620000, 3, 20}, {0x813F3978F8940984, 30, 28},
{0xC097CE7BC90715B3, 56, 36}, {0x8F7E32CE7BEA5C70, 83, 44},
{0xD5D238A4ABE98068, 109, 52}, {0x9F4F2726179A2245, 136, 60},
{0xED63A231D4C4FB27, 162, 68}, {0xB0DE65388CC8ADA8, 189, 76},
{0x83C7088E1AAB65DB, 216, 84}, {0xC45D1DF942711D9A, 242, 92},
{0x924D692CA61BE758, 269, 100}, {0xDA01EE641A708DEA, 295, 108},
{0xA26DA3999AEF774A, 322, 116}, {0xF209787BB47D6B85, 348, 124},
{0xB454E4A179DD1877, 375, 132}, {0x865B86925B9BC5C2, 402, 140},
{0xC83553C5C8965D3D, 428, 148}, {0x952AB45CFA97A0B3, 455, 156},
{0xDE469FBD99A05FE3, 481, 164}, {0xA59BC234DB398C25, 508, 172},
{0xF6C69A72A3989F5C, 534, 180}, {0xB7DCBF5354E9BECE, 561, 188},
{0x88FCF317F22241E2, 588, 196}, {0xCC20CE9BD35C78A5, 614, 204},
{0x98165AF37B2153DF, 641, 212}, {0xE2A0B5DC971F303A, 667, 220},
{0xA8D9D1535CE3B396, 694, 228}, {0xFB9B7CD9A4A7443C, 720, 236},
{0xBB764C4CA7A44410, 747, 244}, {0x8BAB8EEFB6409C1A, 774, 252},
{0xD01FEF10A657842C, 800, 260}, {0x9B10A4E5E9913129, 827, 268},
{0xE7109BFBA19C0C9D, 853, 276}, {0xAC2820D9623BF429, 880, 284},
{0x80444B5E7AA7CF85, 907, 292}, {0xBF21E44003ACDD2D, 933, 300},
{0x8E679C2F5E44FF8F, 960, 308}, {0xD433179D9C8CB841, 986, 316},
{0x9E19DB92B4E31BA9, 1013, 324},
}};
// This computation gives exactly the same results for k as
// k = ceil((kAlpha - e - 1) * 0.30102999566398114)
// for |e| <= 1500, but doesn't require floating-point operations.
// NB: log_10(2) ~= 78913 / 2^18
const int f = kAlpha - e - 1;
const int k = (f * 78913) / (1 << 18) + static_cast<int>(f > 0);
const int index = (-kCachedPowersMinDecExp + k + (kCachedPowersDecStep - 1)) /
kCachedPowersDecStep;
const cached_power cached = kCachedPowers[static_cast<std::size_t>(index)];
return cached;
}
/*!
For n != 0, returns k, such that pow10 := 10^(k-1) <= n < 10^k.
For n == 0, returns 1 and sets pow10 := 1.
*/
inline int find_largest_pow10(const std::uint32_t n, std::uint32_t &pow10) {
// LCOV_EXCL_START
if (n >= 1000000000) {
pow10 = 1000000000;
return 10;
}
// LCOV_EXCL_STOP
else if (n >= 100000000) {
pow10 = 100000000;
return 9;
} else if (n >= 10000000) {
pow10 = 10000000;
return 8;
} else if (n >= 1000000) {
pow10 = 1000000;
return 7;
} else if (n >= 100000) {
pow10 = 100000;
return 6;
} else if (n >= 10000) {
pow10 = 10000;
return 5;
} else if (n >= 1000) {
pow10 = 1000;
return 4;
} else if (n >= 100) {
pow10 = 100;
return 3;
} else if (n >= 10) {
pow10 = 10;
return 2;
} else {
pow10 = 1;
return 1;
}
}
inline void grisu2_round(char *buf, int len, std::uint64_t dist,
std::uint64_t delta, std::uint64_t rest,
std::uint64_t ten_k) {
// <--------------------------- delta ---->
// <---- dist --------->
// --------------[------------------+-------------------]--------------
// M- w M+
//
// ten_k
// <------>
// <---- rest ---->
// --------------[------------------+----+--------------]--------------
// w V
// = buf * 10^k
//
// ten_k represents a unit-in-the-last-place in the decimal representation
// stored in buf.
// Decrement buf by ten_k while this takes buf closer to w.
// The tests are written in this order to avoid overflow in unsigned
// integer arithmetic.
while (rest < dist && delta - rest >= ten_k &&
(rest + ten_k < dist || dist - rest > rest + ten_k - dist)) {
buf[len - 1]--;
rest += ten_k;
}
}
/*!
Generates V = buffer * 10^decimal_exponent, such that M- <= V <= M+.
M- and M+ must be normalized and share the same exponent -60 <= e <= -32.
*/
inline void grisu2_digit_gen(char *buffer, int &length, int &decimal_exponent,
diyfp M_minus, diyfp w, diyfp M_plus) {
static_assert(kAlpha >= -60, "internal error");
static_assert(kGamma <= -32, "internal error");
// Generates the digits (and the exponent) of a decimal floating-point
// number V = buffer * 10^decimal_exponent in the range [M-, M+]. The diyfp's
// w, M- and M+ share the same exponent e, which satisfies alpha <= e <=
// gamma.
//
// <--------------------------- delta ---->
// <---- dist --------->
// --------------[------------------+-------------------]--------------
// M- w M+
//
// Grisu2 generates the digits of M+ from left to right and stops as soon as
// V is in [M-,M+].
std::uint64_t delta =
diyfp::sub(M_plus, M_minus)
.f; // (significand of (M+ - M-), implicit exponent is e)
std::uint64_t dist =
diyfp::sub(M_plus, w)
.f; // (significand of (M+ - w ), implicit exponent is e)
// Split M+ = f * 2^e into two parts p1 and p2 (note: e < 0):
//
// M+ = f * 2^e
// = ((f div 2^-e) * 2^-e + (f mod 2^-e)) * 2^e
// = ((p1 ) * 2^-e + (p2 )) * 2^e
// = p1 + p2 * 2^e
const diyfp one(std::uint64_t{1} << -M_plus.e, M_plus.e);
auto p1 = static_cast<std::uint32_t>(
M_plus.f >>
-one.e); // p1 = f div 2^-e (Since -e >= 32, p1 fits into a 32-bit int.)
std::uint64_t p2 = M_plus.f & (one.f - 1); // p2 = f mod 2^-e
// 1)
//
// Generate the digits of the integral part p1 = d[n-1]...d[1]d[0]
std::uint32_t pow10;
const int k = find_largest_pow10(p1, pow10);
// 10^(k-1) <= p1 < 10^k, pow10 = 10^(k-1)
//
// p1 = (p1 div 10^(k-1)) * 10^(k-1) + (p1 mod 10^(k-1))
// = (d[k-1] ) * 10^(k-1) + (p1 mod 10^(k-1))
//
// M+ = p1 + p2 * 2^e
// = d[k-1] * 10^(k-1) + (p1 mod 10^(k-1)) + p2 * 2^e
// = d[k-1] * 10^(k-1) + ((p1 mod 10^(k-1)) * 2^-e + p2) * 2^e
// = d[k-1] * 10^(k-1) + ( rest) * 2^e
//
// Now generate the digits d[n] of p1 from left to right (n = k-1,...,0)
//
// p1 = d[k-1]...d[n] * 10^n + d[n-1]...d[0]
//
// but stop as soon as
//
// rest * 2^e = (d[n-1]...d[0] * 2^-e + p2) * 2^e <= delta * 2^e
int n = k;
while (n > 0) {
// Invariants:
// M+ = buffer * 10^n + (p1 + p2 * 2^e) (buffer = 0 for n = k)
// pow10 = 10^(n-1) <= p1 < 10^n
//
const std::uint32_t d = p1 / pow10; // d = p1 div 10^(n-1)
const std::uint32_t r = p1 % pow10; // r = p1 mod 10^(n-1)
//
// M+ = buffer * 10^n + (d * 10^(n-1) + r) + p2 * 2^e
// = (buffer * 10 + d) * 10^(n-1) + (r + p2 * 2^e)
//
buffer[length++] = static_cast<char>('0' + d); // buffer := buffer * 10 + d
//
// M+ = buffer * 10^(n-1) + (r + p2 * 2^e)
//
p1 = r;
n--;
//
// M+ = buffer * 10^n + (p1 + p2 * 2^e)
// pow10 = 10^n
//
// Now check if enough digits have been generated.
// Compute
//
// p1 + p2 * 2^e = (p1 * 2^-e + p2) * 2^e = rest * 2^e
//
// Note:
// Since rest and delta share the same exponent e, it suffices to
// compare the significands.
const std::uint64_t rest = (std::uint64_t{p1} << -one.e) + p2;
if (rest <= delta) {
// V = buffer * 10^n, with M- <= V <= M+.
decimal_exponent += n;
// We may now just stop. But instead look if the buffer could be
// decremented to bring V closer to w.
//
// pow10 = 10^n is now 1 ulp in the decimal representation V.
// The rounding procedure works with diyfp's with an implicit
// exponent of e.
//
// 10^n = (10^n * 2^-e) * 2^e = ulp * 2^e
//
const std::uint64_t ten_n = std::uint64_t{pow10} << -one.e;
grisu2_round(buffer, length, dist, delta, rest, ten_n);
return;
}
pow10 /= 10;
//
// pow10 = 10^(n-1) <= p1 < 10^n
// Invariants restored.
}
// 2)
//
// The digits of the integral part have been generated:
//
// M+ = d[k-1]...d[1]d[0] + p2 * 2^e
// = buffer + p2 * 2^e
//
// Now generate the digits of the fractional part p2 * 2^e.
//
// Note:
// No decimal point is generated: the exponent is adjusted instead.
//
// p2 actually represents the fraction
//
// p2 * 2^e
// = p2 / 2^-e
// = d[-1] / 10^1 + d[-2] / 10^2 + ...
//
// Now generate the digits d[-m] of p1 from left to right (m = 1,2,...)
//
// p2 * 2^e = d[-1]d[-2]...d[-m] * 10^-m
// + 10^-m * (d[-m-1] / 10^1 + d[-m-2] / 10^2 + ...)
//
// using
//
// 10^m * p2 = ((10^m * p2) div 2^-e) * 2^-e + ((10^m * p2) mod 2^-e)
// = ( d) * 2^-e + ( r)
//
// or
// 10^m * p2 * 2^e = d + r * 2^e
//
// i.e.
//
// M+ = buffer + p2 * 2^e
// = buffer + 10^-m * (d + r * 2^e)
// = (buffer * 10^m + d) * 10^-m + 10^-m * r * 2^e
//
// and stop as soon as 10^-m * r * 2^e <= delta * 2^e
int m = 0;
for (;;) {
// Invariant:
// M+ = buffer * 10^-m + 10^-m * (d[-m-1] / 10 + d[-m-2] / 10^2 + ...)
// * 2^e
// = buffer * 10^-m + 10^-m * (p2 )
// * 2^e = buffer * 10^-m + 10^-m * (1/10 * (10 * p2) ) * 2^e =
// buffer * 10^-m + 10^-m * (1/10 * ((10*p2 div 2^-e) * 2^-e +
// (10*p2 mod 2^-e)) * 2^e
//
p2 *= 10;
const std::uint64_t d = p2 >> -one.e; // d = (10 * p2) div 2^-e
const std::uint64_t r = p2 & (one.f - 1); // r = (10 * p2) mod 2^-e
//
// M+ = buffer * 10^-m + 10^-m * (1/10 * (d * 2^-e + r) * 2^e
// = buffer * 10^-m + 10^-m * (1/10 * (d + r * 2^e))
// = (buffer * 10 + d) * 10^(-m-1) + 10^(-m-1) * r * 2^e
//
buffer[length++] = static_cast<char>('0' + d); // buffer := buffer * 10 + d
//
// M+ = buffer * 10^(-m-1) + 10^(-m-1) * r * 2^e
//
p2 = r;
m++;
//
// M+ = buffer * 10^-m + 10^-m * p2 * 2^e
// Invariant restored.
// Check if enough digits have been generated.
//
// 10^-m * p2 * 2^e <= delta * 2^e
// p2 * 2^e <= 10^m * delta * 2^e
// p2 <= 10^m * delta
delta *= 10;
dist *= 10;
if (p2 <= delta) {
break;
}
}
// V = buffer * 10^-m, with M- <= V <= M+.
decimal_exponent -= m;
// 1 ulp in the decimal representation is now 10^-m.
// Since delta and dist are now scaled by 10^m, we need to do the
// same with ulp in order to keep the units in sync.
//
// 10^m * 10^-m = 1 = 2^-e * 2^e = ten_m * 2^e
//
const std::uint64_t ten_m = one.f;
grisu2_round(buffer, length, dist, delta, p2, ten_m);
// By construction this algorithm generates the shortest possible decimal
// number (Loitsch, Theorem 6.2) which rounds back to w.
// For an input number of precision p, at least
//
// N = 1 + ceil(p * log_10(2))
//
// decimal digits are sufficient to identify all binary floating-point
// numbers (Matula, "In-and-Out conversions").
// This implies that the algorithm does not produce more than N decimal
// digits.
//
// N = 17 for p = 53 (IEEE double precision)
// N = 9 for p = 24 (IEEE single precision)
}
/*!
v = buf * 10^decimal_exponent
len is the length of the buffer (number of decimal digits)
The buffer must be large enough, i.e. >= max_digits10.
*/
inline void grisu2(char *buf, int &len, int &decimal_exponent, diyfp m_minus,
diyfp v, diyfp m_plus) {
// --------(-----------------------+-----------------------)-------- (A)
// m- v m+
//
// --------------------(-----------+-----------------------)-------- (B)
// m- v m+
//
// First scale v (and m- and m+) such that the exponent is in the range
// [alpha, gamma].
const cached_power cached = get_cached_power_for_binary_exponent(m_plus.e);
const diyfp c_minus_k(cached.f, cached.e); // = c ~= 10^-k
// The exponent of the products is = v.e + c_minus_k.e + q and is in the range
// [alpha,gamma]
const diyfp w = diyfp::mul(v, c_minus_k);
const diyfp w_minus = diyfp::mul(m_minus, c_minus_k);
const diyfp w_plus = diyfp::mul(m_plus, c_minus_k);
// ----(---+---)---------------(---+---)---------------(---+---)----
// w- w w+
// = c*m- = c*v = c*m+
//
// diyfp::mul rounds its result and c_minus_k is approximated too. w, w- and
// w+ are now off by a small amount.
// In fact:
//
// w - v * 10^k < 1 ulp
//
// To account for this inaccuracy, add resp. subtract 1 ulp.
//
// --------+---[---------------(---+---)---------------]---+--------
// w- M- w M+ w+
//
// Now any number in [M-, M+] (bounds included) will round to w when input,
// regardless of how the input rounding algorithm breaks ties.
//
// And digit_gen generates the shortest possible such number in [M-, M+].
// Note that this does not mean that Grisu2 always generates the shortest
// possible number in the interval (m-, m+).
const diyfp M_minus(w_minus.f + 1, w_minus.e);
const diyfp M_plus(w_plus.f - 1, w_plus.e);
decimal_exponent = -cached.k; // = -(-k) = k
grisu2_digit_gen(buf, len, decimal_exponent, M_minus, w, M_plus);
}
/*!
v = buf * 10^decimal_exponent
len is the length of the buffer (number of decimal digits)
The buffer must be large enough, i.e. >= max_digits10.
*/
template <typename FloatType>
void grisu2(char *buf, int &len, int &decimal_exponent, FloatType value) {
static_assert(diyfp::kPrecision >= std::numeric_limits<FloatType>::digits + 3,
"internal error: not enough precision");
// If the neighbors (and boundaries) of 'value' are always computed for
// double-precision numbers, all float's can be recovered using strtod (and
// strtof). However, the resulting decimal representations are not exactly
// "short".
//
// The documentation for 'std::to_chars'
// (https://en.cppreference.com/w/cpp/utility/to_chars) says "value is
// converted to a string as if by std::sprintf in the default ("C") locale"
// and since sprintf promotes float's to double's, I think this is exactly
// what 'std::to_chars' does. On the other hand, the documentation for
// 'std::to_chars' requires that "parsing the representation using the
// corresponding std::from_chars function recovers value exactly". That
// indicates that single precision floating-point numbers should be recovered
// using 'std::strtof'.
//
// NB: If the neighbors are computed for single-precision numbers, there is a
// single float
// (7.0385307e-26f) which can't be recovered using strtod. The resulting
// double precision value is off by 1 ulp.
#if 0
const boundaries w = compute_boundaries(static_cast<double>(value));
#else
const boundaries w = compute_boundaries(value);
#endif
grisu2(buf, len, decimal_exponent, w.minus, w.w, w.plus);
}
/*!
@brief appends a decimal representation of e to buf
@return a pointer to the element following the exponent.
@pre -1000 < e < 1000
*/
inline char *append_exponent(char *buf, int e) {
if (e < 0) {
e = -e;
*buf++ = '-';
} else {
*buf++ = '+';
}
auto k = static_cast<std::uint32_t>(e);
if (k < 10) {
// Always print at least two digits in the exponent.
// This is for compatibility with printf("%g").
*buf++ = '0';
*buf++ = static_cast<char>('0' + k);
} else if (k < 100) {
*buf++ = static_cast<char>('0' + k / 10);
k %= 10;
*buf++ = static_cast<char>('0' + k);
} else {
*buf++ = static_cast<char>('0' + k / 100);
k %= 100;
*buf++ = static_cast<char>('0' + k / 10);
k %= 10;
*buf++ = static_cast<char>('0' + k);
}
return buf;
}
/*!
@brief prettify v = buf * 10^decimal_exponent
If v is in the range [10^min_exp, 10^max_exp) it will be printed in fixed-point
notation. Otherwise it will be printed in exponential notation.
@pre min_exp < 0
@pre max_exp > 0
*/
inline char *format_buffer(char *buf, int len, int decimal_exponent,
int min_exp, int max_exp) {
const int k = len;
const int n = len + decimal_exponent;
// v = buf * 10^(n-k)
// k is the length of the buffer (number of decimal digits)
// n is the position of the decimal point relative to the start of the buffer.
if (k <= n && n <= max_exp) {
// digits[000]
// len <= max_exp + 2
std::memset(buf + k, '0', static_cast<size_t>(n) - static_cast<size_t>(k));
// Make it look like a floating-point number (#362, #378)
buf[n + 0] = '.';
buf[n + 1] = '0';
return buf + (static_cast<size_t>(n)) + 2;
}
if (0 < n && n <= max_exp) {
// dig.its
// len <= max_digits10 + 1
std::memmove(buf + (static_cast<size_t>(n) + 1), buf + n,
static_cast<size_t>(k) - static_cast<size_t>(n));
buf[n] = '.';
return buf + (static_cast<size_t>(k) + 1U);
}
if (min_exp < n && n <= 0) {
// 0.[000]digits
// len <= 2 + (-min_exp - 1) + max_digits10
std::memmove(buf + (2 + static_cast<size_t>(-n)), buf,
static_cast<size_t>(k));
buf[0] = '0';
buf[1] = '.';
std::memset(buf + 2, '0', static_cast<size_t>(-n));
return buf + (2U + static_cast<size_t>(-n) + static_cast<size_t>(k));
}
if (k == 1) {
// dE+123
// len <= 1 + 5
buf += 1;
} else {
// d.igitsE+123
// len <= max_digits10 + 1 + 5
std::memmove(buf + 2, buf + 1, static_cast<size_t>(k) - 1);
buf[1] = '.';
buf += 1 + static_cast<size_t>(k);
}
*buf++ = 'e';
return append_exponent(buf, n - 1);
}
} // namespace dtoa_impl
/*!
The format of the resulting decimal representation is similar to printf's %g
format. Returns an iterator pointing past-the-end of the decimal representation.
@note The input number must be finite, i.e. NaN's and Inf's are not supported.
@note The buffer must be large enough.
@note The result is NOT null-terminated.
*/
char *to_chars(char *first, const char *last, double value) {
static_cast<void>(last); // maybe unused - fix warning
bool negative = std::signbit(value);
if (negative) {
value = -value;
*first++ = '-';
}
if (value == 0) // +-0
{
*first++ = '0';
// Make it look like a floating-point number (#362, #378)
*first++ = '.';
*first++ = '0';
return first;
}
// Compute v = buffer * 10^decimal_exponent.
// The decimal digits are stored in the buffer, which needs to be interpreted
// as an unsigned decimal integer.
// len is the length of the buffer, i.e. the number of decimal digits.
int len = 0;
int decimal_exponent = 0;
dtoa_impl::grisu2(first, len, decimal_exponent, value);
// Format the buffer like printf("%.*g", prec, value)
constexpr int kMinExp = -4;
constexpr int kMaxExp = std::numeric_limits<double>::digits10;
return dtoa_impl::format_buffer(first, len, decimal_exponent, kMinExp,
kMaxExp);
}
} // namespace internal
} // namespace simdjson
#endif // SIMDJSON_SRC_TO_CHARS_CPP
/* end file to_chars.cpp */
/* including from_chars.cpp: #include <from_chars.cpp> */
/* begin file from_chars.cpp */
#ifndef SIMDJSON_SRC_FROM_CHARS_CPP
#define SIMDJSON_SRC_FROM_CHARS_CPP
/* skipped duplicate #include <base.h> */
#include <cstdint>
#include <cstring>
#include <limits>
namespace simdjson {
namespace internal {
/**
* The code in the internal::from_chars function is meant to handle the floating-point number parsing
* when we have more than 19 digits in the decimal mantissa. This should only be seen
* in adversarial scenarios: we do not expect production systems to even produce
* such floating-point numbers.
*
* The parser is based on work by Nigel Tao (at https://github.com/google/wuffs/)
* who credits Ken Thompson for the design (via a reference to the Go source
* code). See
* https://github.com/google/wuffs/blob/aa46859ea40c72516deffa1b146121952d6dfd3b/internal/cgen/base/floatconv-submodule-data.c
* https://github.com/google/wuffs/blob/46cd8105f47ca07ae2ba8e6a7818ef9c0df6c152/internal/cgen/base/floatconv-submodule-code.c
* It is probably not very fast but it is a fallback that should almost never be
* called in real life. Google Wuffs is published under APL 2.0.
**/
namespace {
constexpr uint32_t max_digits = 768;
constexpr int32_t decimal_point_range = 2047;
} // namespace
struct adjusted_mantissa {
uint64_t mantissa;
int power2;
adjusted_mantissa() : mantissa(0), power2(0) {}
};
struct decimal {
uint32_t num_digits;
int32_t decimal_point;
bool negative;
bool truncated;
uint8_t digits[max_digits];
};
template <typename T> struct binary_format {
static constexpr int mantissa_explicit_bits();
static constexpr int minimum_exponent();
static constexpr int infinite_power();
static constexpr int sign_index();
};
template <> constexpr int binary_format<double>::mantissa_explicit_bits() {
return 52;
}
template <> constexpr int binary_format<double>::minimum_exponent() {
return -1023;
}
template <> constexpr int binary_format<double>::infinite_power() {
return 0x7FF;
}
template <> constexpr int binary_format<double>::sign_index() { return 63; }
bool is_integer(char c) noexcept { return (c >= '0' && c <= '9'); }
// This should always succeed since it follows a call to parse_number.
decimal parse_decimal(const char *&p) noexcept {
decimal answer;
answer.num_digits = 0;
answer.decimal_point = 0;
answer.truncated = false;
answer.negative = (*p == '-');
if ((*p == '-') || (*p == '+')) {
++p;
}
while (*p == '0') {
++p;
}
while (is_integer(*p)) {
if (answer.num_digits < max_digits) {
answer.digits[answer.num_digits] = uint8_t(*p - '0');
}
answer.num_digits++;
++p;
}
if (*p == '.') {
++p;
const char *first_after_period = p;
// if we have not yet encountered a zero, we have to skip it as well
if (answer.num_digits == 0) {
// skip zeros
while (*p == '0') {
++p;
}
}
while (is_integer(*p)) {
if (answer.num_digits < max_digits) {
answer.digits[answer.num_digits] = uint8_t(*p - '0');
}
answer.num_digits++;
++p;
}
answer.decimal_point = int32_t(first_after_period - p);
}
if(answer.num_digits > 0) {
const char *preverse = p - 1;
int32_t trailing_zeros = 0;
while ((*preverse == '0') || (*preverse == '.')) {
if(*preverse == '0') { trailing_zeros++; };
--preverse;
}
answer.decimal_point += int32_t(answer.num_digits);
answer.num_digits -= uint32_t(trailing_zeros);
}
if(answer.num_digits > max_digits ) {
answer.num_digits = max_digits;
answer.truncated = true;
}
if (('e' == *p) || ('E' == *p)) {
++p;
bool neg_exp = false;
if ('-' == *p) {
neg_exp = true;
++p;
} else if ('+' == *p) {
++p;
}
int32_t exp_number = 0; // exponential part
while (is_integer(*p)) {
uint8_t digit = uint8_t(*p - '0');
if (exp_number < 0x10000) {
exp_number = 10 * exp_number + digit;
}
++p;
}
answer.decimal_point += (neg_exp ? -exp_number : exp_number);
}
return answer;
}
// This should always succeed since it follows a call to parse_number.
// Will not read at or beyond the "end" pointer.
decimal parse_decimal(const char *&p, const char * end) noexcept {
decimal answer;
answer.num_digits = 0;
answer.decimal_point = 0;
answer.truncated = false;
if(p == end) { return answer; } // should never happen
answer.negative = (*p == '-');
if ((*p == '-') || (*p == '+')) {
++p;
}
while ((p != end) && (*p == '0')) {
++p;
}
while ((p != end) && is_integer(*p)) {
if (answer.num_digits < max_digits) {
answer.digits[answer.num_digits] = uint8_t(*p - '0');
}
answer.num_digits++;
++p;
}
if ((p != end) && (*p == '.')) {
++p;
if(p == end) { return answer; } // should never happen
const char *first_after_period = p;
// if we have not yet encountered a zero, we have to skip it as well
if (answer.num_digits == 0) {
// skip zeros
while (*p == '0') {
++p;
}
}
while ((p != end) && is_integer(*p)) {
if (answer.num_digits < max_digits) {
answer.digits[answer.num_digits] = uint8_t(*p - '0');
}
answer.num_digits++;
++p;
}
answer.decimal_point = int32_t(first_after_period - p);
}
if(answer.num_digits > 0) {
const char *preverse = p - 1;
int32_t trailing_zeros = 0;
while ((*preverse == '0') || (*preverse == '.')) {
if(*preverse == '0') { trailing_zeros++; };
--preverse;
}
answer.decimal_point += int32_t(answer.num_digits);
answer.num_digits -= uint32_t(trailing_zeros);
}
if(answer.num_digits > max_digits ) {
answer.num_digits = max_digits;
answer.truncated = true;
}
if ((p != end) && (('e' == *p) || ('E' == *p))) {
++p;
if(p == end) { return answer; } // should never happen
bool neg_exp = false;
if ('-' == *p) {
neg_exp = true;
++p;
} else if ('+' == *p) {
++p;
}
int32_t exp_number = 0; // exponential part
while ((p != end) && is_integer(*p)) {
uint8_t digit = uint8_t(*p - '0');
if (exp_number < 0x10000) {
exp_number = 10 * exp_number + digit;
}
++p;
}
answer.decimal_point += (neg_exp ? -exp_number : exp_number);
}
return answer;
}
namespace {
// remove all final zeroes
inline void trim(decimal &h) {
while ((h.num_digits > 0) && (h.digits[h.num_digits - 1] == 0)) {
h.num_digits--;
}
}
uint32_t number_of_digits_decimal_left_shift(decimal &h, uint32_t shift) {
shift &= 63;
const static uint16_t number_of_digits_decimal_left_shift_table[65] = {
0x0000, 0x0800, 0x0801, 0x0803, 0x1006, 0x1009, 0x100D, 0x1812, 0x1817,
0x181D, 0x2024, 0x202B, 0x2033, 0x203C, 0x2846, 0x2850, 0x285B, 0x3067,
0x3073, 0x3080, 0x388E, 0x389C, 0x38AB, 0x38BB, 0x40CC, 0x40DD, 0x40EF,
0x4902, 0x4915, 0x4929, 0x513E, 0x5153, 0x5169, 0x5180, 0x5998, 0x59B0,
0x59C9, 0x61E3, 0x61FD, 0x6218, 0x6A34, 0x6A50, 0x6A6D, 0x6A8B, 0x72AA,
0x72C9, 0x72E9, 0x7B0A, 0x7B2B, 0x7B4D, 0x8370, 0x8393, 0x83B7, 0x83DC,
0x8C02, 0x8C28, 0x8C4F, 0x9477, 0x949F, 0x94C8, 0x9CF2, 0x051C, 0x051C,
0x051C, 0x051C,
};
uint32_t x_a = number_of_digits_decimal_left_shift_table[shift];
uint32_t x_b = number_of_digits_decimal_left_shift_table[shift + 1];
uint32_t num_new_digits = x_a >> 11;
uint32_t pow5_a = 0x7FF & x_a;
uint32_t pow5_b = 0x7FF & x_b;
const static uint8_t
number_of_digits_decimal_left_shift_table_powers_of_5[0x051C] = {
5, 2, 5, 1, 2, 5, 6, 2, 5, 3, 1, 2, 5, 1, 5, 6, 2, 5, 7, 8, 1, 2, 5,
3, 9, 0, 6, 2, 5, 1, 9, 5, 3, 1, 2, 5, 9, 7, 6, 5, 6, 2, 5, 4, 8, 8,
2, 8, 1, 2, 5, 2, 4, 4, 1, 4, 0, 6, 2, 5, 1, 2, 2, 0, 7, 0, 3, 1, 2,
5, 6, 1, 0, 3, 5, 1, 5, 6, 2, 5, 3, 0, 5, 1, 7, 5, 7, 8, 1, 2, 5, 1,
5, 2, 5, 8, 7, 8, 9, 0, 6, 2, 5, 7, 6, 2, 9, 3, 9, 4, 5, 3, 1, 2, 5,
3, 8, 1, 4, 6, 9, 7, 2, 6, 5, 6, 2, 5, 1, 9, 0, 7, 3, 4, 8, 6, 3, 2,
8, 1, 2, 5, 9, 5, 3, 6, 7, 4, 3, 1, 6, 4, 0, 6, 2, 5, 4, 7, 6, 8, 3,
7, 1, 5, 8, 2, 0, 3, 1, 2, 5, 2, 3, 8, 4, 1, 8, 5, 7, 9, 1, 0, 1, 5,
6, 2, 5, 1, 1, 9, 2, 0, 9, 2, 8, 9, 5, 5, 0, 7, 8, 1, 2, 5, 5, 9, 6,
0, 4, 6, 4, 4, 7, 7, 5, 3, 9, 0, 6, 2, 5, 2, 9, 8, 0, 2, 3, 2, 2, 3,
8, 7, 6, 9, 5, 3, 1, 2, 5, 1, 4, 9, 0, 1, 1, 6, 1, 1, 9, 3, 8, 4, 7,
6, 5, 6, 2, 5, 7, 4, 5, 0, 5, 8, 0, 5, 9, 6, 9, 2, 3, 8, 2, 8, 1, 2,
5, 3, 7, 2, 5, 2, 9, 0, 2, 9, 8, 4, 6, 1, 9, 1, 4, 0, 6, 2, 5, 1, 8,
6, 2, 6, 4, 5, 1, 4, 9, 2, 3, 0, 9, 5, 7, 0, 3, 1, 2, 5, 9, 3, 1, 3,
2, 2, 5, 7, 4, 6, 1, 5, 4, 7, 8, 5, 1, 5, 6, 2, 5, 4, 6, 5, 6, 6, 1,
2, 8, 7, 3, 0, 7, 7, 3, 9, 2, 5, 7, 8, 1, 2, 5, 2, 3, 2, 8, 3, 0, 6,
4, 3, 6, 5, 3, 8, 6, 9, 6, 2, 8, 9, 0, 6, 2, 5, 1, 1, 6, 4, 1, 5, 3,
2, 1, 8, 2, 6, 9, 3, 4, 8, 1, 4, 4, 5, 3, 1, 2, 5, 5, 8, 2, 0, 7, 6,
6, 0, 9, 1, 3, 4, 6, 7, 4, 0, 7, 2, 2, 6, 5, 6, 2, 5, 2, 9, 1, 0, 3,
8, 3, 0, 4, 5, 6, 7, 3, 3, 7, 0, 3, 6, 1, 3, 2, 8, 1, 2, 5, 1, 4, 5,
5, 1, 9, 1, 5, 2, 2, 8, 3, 6, 6, 8, 5, 1, 8, 0, 6, 6, 4, 0, 6, 2, 5,
7, 2, 7, 5, 9, 5, 7, 6, 1, 4, 1, 8, 3, 4, 2, 5, 9, 0, 3, 3, 2, 0, 3,
1, 2, 5, 3, 6, 3, 7, 9, 7, 8, 8, 0, 7, 0, 9, 1, 7, 1, 2, 9, 5, 1, 6,
6, 0, 1, 5, 6, 2, 5, 1, 8, 1, 8, 9, 8, 9, 4, 0, 3, 5, 4, 5, 8, 5, 6,
4, 7, 5, 8, 3, 0, 0, 7, 8, 1, 2, 5, 9, 0, 9, 4, 9, 4, 7, 0, 1, 7, 7,
2, 9, 2, 8, 2, 3, 7, 9, 1, 5, 0, 3, 9, 0, 6, 2, 5, 4, 5, 4, 7, 4, 7,
3, 5, 0, 8, 8, 6, 4, 6, 4, 1, 1, 8, 9, 5, 7, 5, 1, 9, 5, 3, 1, 2, 5,
2, 2, 7, 3, 7, 3, 6, 7, 5, 4, 4, 3, 2, 3, 2, 0, 5, 9, 4, 7, 8, 7, 5,
9, 7, 6, 5, 6, 2, 5, 1, 1, 3, 6, 8, 6, 8, 3, 7, 7, 2, 1, 6, 1, 6, 0,
2, 9, 7, 3, 9, 3, 7, 9, 8, 8, 2, 8, 1, 2, 5, 5, 6, 8, 4, 3, 4, 1, 8,
8, 6, 0, 8, 0, 8, 0, 1, 4, 8, 6, 9, 6, 8, 9, 9, 4, 1, 4, 0, 6, 2, 5,
2, 8, 4, 2, 1, 7, 0, 9, 4, 3, 0, 4, 0, 4, 0, 0, 7, 4, 3, 4, 8, 4, 4,
9, 7, 0, 7, 0, 3, 1, 2, 5, 1, 4, 2, 1, 0, 8, 5, 4, 7, 1, 5, 2, 0, 2,
0, 0, 3, 7, 1, 7, 4, 2, 2, 4, 8, 5, 3, 5, 1, 5, 6, 2, 5, 7, 1, 0, 5,
4, 2, 7, 3, 5, 7, 6, 0, 1, 0, 0, 1, 8, 5, 8, 7, 1, 1, 2, 4, 2, 6, 7,
5, 7, 8, 1, 2, 5, 3, 5, 5, 2, 7, 1, 3, 6, 7, 8, 8, 0, 0, 5, 0, 0, 9,
2, 9, 3, 5, 5, 6, 2, 1, 3, 3, 7, 8, 9, 0, 6, 2, 5, 1, 7, 7, 6, 3, 5,
6, 8, 3, 9, 4, 0, 0, 2, 5, 0, 4, 6, 4, 6, 7, 7, 8, 1, 0, 6, 6, 8, 9,
4, 5, 3, 1, 2, 5, 8, 8, 8, 1, 7, 8, 4, 1, 9, 7, 0, 0, 1, 2, 5, 2, 3,
2, 3, 3, 8, 9, 0, 5, 3, 3, 4, 4, 7, 2, 6, 5, 6, 2, 5, 4, 4, 4, 0, 8,
9, 2, 0, 9, 8, 5, 0, 0, 6, 2, 6, 1, 6, 1, 6, 9, 4, 5, 2, 6, 6, 7, 2,
3, 6, 3, 2, 8, 1, 2, 5, 2, 2, 2, 0, 4, 4, 6, 0, 4, 9, 2, 5, 0, 3, 1,
3, 0, 8, 0, 8, 4, 7, 2, 6, 3, 3, 3, 6, 1, 8, 1, 6, 4, 0, 6, 2, 5, 1,
1, 1, 0, 2, 2, 3, 0, 2, 4, 6, 2, 5, 1, 5, 6, 5, 4, 0, 4, 2, 3, 6, 3,
1, 6, 6, 8, 0, 9, 0, 8, 2, 0, 3, 1, 2, 5, 5, 5, 5, 1, 1, 1, 5, 1, 2,
3, 1, 2, 5, 7, 8, 2, 7, 0, 2, 1, 1, 8, 1, 5, 8, 3, 4, 0, 4, 5, 4, 1,
0, 1, 5, 6, 2, 5, 2, 7, 7, 5, 5, 5, 7, 5, 6, 1, 5, 6, 2, 8, 9, 1, 3,
5, 1, 0, 5, 9, 0, 7, 9, 1, 7, 0, 2, 2, 7, 0, 5, 0, 7, 8, 1, 2, 5, 1,
3, 8, 7, 7, 7, 8, 7, 8, 0, 7, 8, 1, 4, 4, 5, 6, 7, 5, 5, 2, 9, 5, 3,
9, 5, 8, 5, 1, 1, 3, 5, 2, 5, 3, 9, 0, 6, 2, 5, 6, 9, 3, 8, 8, 9, 3,
9, 0, 3, 9, 0, 7, 2, 2, 8, 3, 7, 7, 6, 4, 7, 6, 9, 7, 9, 2, 5, 5, 6,
7, 6, 2, 6, 9, 5, 3, 1, 2, 5, 3, 4, 6, 9, 4, 4, 6, 9, 5, 1, 9, 5, 3,
6, 1, 4, 1, 8, 8, 8, 2, 3, 8, 4, 8, 9, 6, 2, 7, 8, 3, 8, 1, 3, 4, 7,
6, 5, 6, 2, 5, 1, 7, 3, 4, 7, 2, 3, 4, 7, 5, 9, 7, 6, 8, 0, 7, 0, 9,
4, 4, 1, 1, 9, 2, 4, 4, 8, 1, 3, 9, 1, 9, 0, 6, 7, 3, 8, 2, 8, 1, 2,
5, 8, 6, 7, 3, 6, 1, 7, 3, 7, 9, 8, 8, 4, 0, 3, 5, 4, 7, 2, 0, 5, 9,
6, 2, 2, 4, 0, 6, 9, 5, 9, 5, 3, 3, 6, 9, 1, 4, 0, 6, 2, 5,
};
const uint8_t *pow5 =
&number_of_digits_decimal_left_shift_table_powers_of_5[pow5_a];
uint32_t i = 0;
uint32_t n = pow5_b - pow5_a;
for (; i < n; i++) {
if (i >= h.num_digits) {
return num_new_digits - 1;
} else if (h.digits[i] == pow5[i]) {
continue;
} else if (h.digits[i] < pow5[i]) {
return num_new_digits - 1;
} else {
return num_new_digits;
}
}
return num_new_digits;
}
} // end of anonymous namespace
uint64_t round(decimal &h) {
if ((h.num_digits == 0) || (h.decimal_point < 0)) {
return 0;
} else if (h.decimal_point > 18) {
return UINT64_MAX;
}
// at this point, we know that h.decimal_point >= 0
uint32_t dp = uint32_t(h.decimal_point);
uint64_t n = 0;
for (uint32_t i = 0; i < dp; i++) {
n = (10 * n) + ((i < h.num_digits) ? h.digits[i] : 0);
}
bool round_up = false;
if (dp < h.num_digits) {
round_up = h.digits[dp] >= 5; // normally, we round up
// but we may need to round to even!
if ((h.digits[dp] == 5) && (dp + 1 == h.num_digits)) {
round_up = h.truncated || ((dp > 0) && (1 & h.digits[dp - 1]));
}
}
if (round_up) {
n++;
}
return n;
}
// computes h * 2^-shift
void decimal_left_shift(decimal &h, uint32_t shift) {
if (h.num_digits == 0) {
return;
}
uint32_t num_new_digits = number_of_digits_decimal_left_shift(h, shift);
int32_t read_index = int32_t(h.num_digits - 1);
uint32_t write_index = h.num_digits - 1 + num_new_digits;
uint64_t n = 0;
while (read_index >= 0) {
n += uint64_t(h.digits[read_index]) << shift;
uint64_t quotient = n / 10;
uint64_t remainder = n - (10 * quotient);
if (write_index < max_digits) {
h.digits[write_index] = uint8_t(remainder);
} else if (remainder > 0) {
h.truncated = true;
}
n = quotient;
write_index--;
read_index--;
}
while (n > 0) {
uint64_t quotient = n / 10;
uint64_t remainder = n - (10 * quotient);
if (write_index < max_digits) {
h.digits[write_index] = uint8_t(remainder);
} else if (remainder > 0) {
h.truncated = true;
}
n = quotient;
write_index--;
}
h.num_digits += num_new_digits;
if (h.num_digits > max_digits) {
h.num_digits = max_digits;
}
h.decimal_point += int32_t(num_new_digits);
trim(h);
}
// computes h * 2^shift
void decimal_right_shift(decimal &h, uint32_t shift) {
uint32_t read_index = 0;
uint32_t write_index = 0;
uint64_t n = 0;
while ((n >> shift) == 0) {
if (read_index < h.num_digits) {
n = (10 * n) + h.digits[read_index++];
} else if (n == 0) {
return;
} else {
while ((n >> shift) == 0) {
n = 10 * n;
read_index++;
}
break;
}
}
h.decimal_point -= int32_t(read_index - 1);
if (h.decimal_point < -decimal_point_range) { // it is zero
h.num_digits = 0;
h.decimal_point = 0;
h.negative = false;
h.truncated = false;
return;
}
uint64_t mask = (uint64_t(1) << shift) - 1;
while (read_index < h.num_digits) {
uint8_t new_digit = uint8_t(n >> shift);
n = (10 * (n & mask)) + h.digits[read_index++];
h.digits[write_index++] = new_digit;
}
while (n > 0) {
uint8_t new_digit = uint8_t(n >> shift);
n = 10 * (n & mask);
if (write_index < max_digits) {
h.digits[write_index++] = new_digit;
} else if (new_digit > 0) {
h.truncated = true;
}
}
h.num_digits = write_index;
trim(h);
}
template <typename binary> adjusted_mantissa compute_float(decimal &d) {
adjusted_mantissa answer;
if (d.num_digits == 0) {
// should be zero
answer.power2 = 0;
answer.mantissa = 0;
return answer;
}
// At this point, going further, we can assume that d.num_digits > 0.
// We want to guard against excessive decimal point values because
// they can result in long running times. Indeed, we do
// shifts by at most 60 bits. We have that log(10**400)/log(2**60) ~= 22
// which is fine, but log(10**299995)/log(2**60) ~= 16609 which is not
// fine (runs for a long time).
//
if(d.decimal_point < -324) {
// We have something smaller than 1e-324 which is always zero
// in binary64 and binary32.
// It should be zero.
answer.power2 = 0;
answer.mantissa = 0;
return answer;
} else if(d.decimal_point >= 310) {
// We have something at least as large as 0.1e310 which is
// always infinite.
answer.power2 = binary::infinite_power();
answer.mantissa = 0;
return answer;
}
static const uint32_t max_shift = 60;
static const uint32_t num_powers = 19;
static const uint8_t powers[19] = {
0, 3, 6, 9, 13, 16, 19, 23, 26, 29, //
33, 36, 39, 43, 46, 49, 53, 56, 59, //
};
int32_t exp2 = 0;
while (d.decimal_point > 0) {
uint32_t n = uint32_t(d.decimal_point);
uint32_t shift = (n < num_powers) ? powers[n] : max_shift;
decimal_right_shift(d, shift);
if (d.decimal_point < -decimal_point_range) {
// should be zero
answer.power2 = 0;
answer.mantissa = 0;
return answer;
}
exp2 += int32_t(shift);
}
// We shift left toward [1/2 ... 1].
while (d.decimal_point <= 0) {
uint32_t shift;
if (d.decimal_point == 0) {
if (d.digits[0] >= 5) {
break;
}
shift = (d.digits[0] < 2) ? 2 : 1;
} else {
uint32_t n = uint32_t(-d.decimal_point);
shift = (n < num_powers) ? powers[n] : max_shift;
}
decimal_left_shift(d, shift);
if (d.decimal_point > decimal_point_range) {
// we want to get infinity:
answer.power2 = 0xFF;
answer.mantissa = 0;
return answer;
}
exp2 -= int32_t(shift);
}
// We are now in the range [1/2 ... 1] but the binary format uses [1 ... 2].
exp2--;
constexpr int32_t minimum_exponent = binary::minimum_exponent();
while ((minimum_exponent + 1) > exp2) {
uint32_t n = uint32_t((minimum_exponent + 1) - exp2);
if (n > max_shift) {
n = max_shift;
}
decimal_right_shift(d, n);
exp2 += int32_t(n);
}
if ((exp2 - minimum_exponent) >= binary::infinite_power()) {
answer.power2 = binary::infinite_power();
answer.mantissa = 0;
return answer;
}
const int mantissa_size_in_bits = binary::mantissa_explicit_bits() + 1;
decimal_left_shift(d, mantissa_size_in_bits);
uint64_t mantissa = round(d);
// It is possible that we have an overflow, in which case we need
// to shift back.
if (mantissa >= (uint64_t(1) << mantissa_size_in_bits)) {
decimal_right_shift(d, 1);
exp2 += 1;
mantissa = round(d);
if ((exp2 - minimum_exponent) >= binary::infinite_power()) {
answer.power2 = binary::infinite_power();
answer.mantissa = 0;
return answer;
}
}
answer.power2 = exp2 - binary::minimum_exponent();
if (mantissa < (uint64_t(1) << binary::mantissa_explicit_bits())) {
answer.power2--;
}
answer.mantissa =
mantissa & ((uint64_t(1) << binary::mantissa_explicit_bits()) - 1);
return answer;
}
template <typename binary>
adjusted_mantissa parse_long_mantissa(const char *first) {
decimal d = parse_decimal(first);
return compute_float<binary>(d);
}
template <typename binary>
adjusted_mantissa parse_long_mantissa(const char *first, const char *end) {
decimal d = parse_decimal(first, end);
return compute_float<binary>(d);
}
double from_chars(const char *first) noexcept {
bool negative = first[0] == '-';
if (negative) {
first++;
}
adjusted_mantissa am = parse_long_mantissa<binary_format<double>>(first);
uint64_t word = am.mantissa;
word |= uint64_t(am.power2)
<< binary_format<double>::mantissa_explicit_bits();
word = negative ? word | (uint64_t(1) << binary_format<double>::sign_index())
: word;
double value;
std::memcpy(&value, &word, sizeof(double));
return value;
}
double from_chars(const char *first, const char *end) noexcept {
bool negative = first[0] == '-';
if (negative) {
first++;
}
adjusted_mantissa am = parse_long_mantissa<binary_format<double>>(first, end);
uint64_t word = am.mantissa;
word |= uint64_t(am.power2)
<< binary_format<double>::mantissa_explicit_bits();
word = negative ? word | (uint64_t(1) << binary_format<double>::sign_index())
: word;
double value;
std::memcpy(&value, &word, sizeof(double));
return value;
}
} // internal
} // simdjson
#endif // SIMDJSON_SRC_FROM_CHARS_CPP
/* end file from_chars.cpp */
/* including internal/error_tables.cpp: #include <internal/error_tables.cpp> */
/* begin file internal/error_tables.cpp */
#ifndef SIMDJSON_SRC_ERROR_TABLES_CPP
#define SIMDJSON_SRC_ERROR_TABLES_CPP
/* including simdjson/internal/jsoncharutils_tables.h: #include <simdjson/internal/jsoncharutils_tables.h> */
/* begin file simdjson/internal/jsoncharutils_tables.h */
#ifndef SIMDJSON_INTERNAL_JSONCHARUTILS_TABLES_H
#define SIMDJSON_INTERNAL_JSONCHARUTILS_TABLES_H
/* skipped duplicate #include "simdjson/base.h" */
#ifdef JSON_TEST_STRINGS
void found_string(const uint8_t *buf, const uint8_t *parsed_begin,
const uint8_t *parsed_end);
void found_bad_string(const uint8_t *buf);
#endif
namespace simdjson {
namespace internal {
// structural chars here are
// they are { 0x7b } 0x7d : 0x3a [ 0x5b ] 0x5d , 0x2c (and NULL)
// we are also interested in the four whitespace characters
// space 0x20, linefeed 0x0a, horizontal tab 0x09 and carriage return 0x0d
extern SIMDJSON_DLLIMPORTEXPORT const bool structural_or_whitespace_negated[256];
extern SIMDJSON_DLLIMPORTEXPORT const bool structural_or_whitespace[256];
extern SIMDJSON_DLLIMPORTEXPORT const uint32_t digit_to_val32[886];
} // namespace internal
} // namespace simdjson
#endif // SIMDJSON_INTERNAL_JSONCHARUTILS_TABLES_H
/* end file simdjson/internal/jsoncharutils_tables.h */
/* including simdjson/error-inl.h: #include <simdjson/error-inl.h> */
/* begin file simdjson/error-inl.h */
#ifndef SIMDJSON_ERROR_INL_H
#define SIMDJSON_ERROR_INL_H
/* skipped duplicate #include "simdjson/error.h" */
#include <iostream>
namespace simdjson {
namespace internal {
// We store the error code so we can validate the error message is associated with the right code
struct error_code_info {
error_code code;
const char* message; // do not use a fancy std::string where a simple C string will do (no alloc, no destructor)
};
// These MUST match the codes in error_code. We check this constraint in basictests.
extern SIMDJSON_DLLIMPORTEXPORT const error_code_info error_codes[];
} // namespace internal
inline const char *error_message(error_code error) noexcept {
// If you're using error_code, we're trusting you got it from the enum.
return internal::error_codes[int(error)].message;
}
// deprecated function
#ifndef SIMDJSON_DISABLE_DEPRECATED_API
inline const std::string error_message(int error) noexcept {
if (error < 0 || error >= error_code::NUM_ERROR_CODES) {
return internal::error_codes[UNEXPECTED_ERROR].message;
}
return internal::error_codes[error].message;
}
#endif // SIMDJSON_DISABLE_DEPRECATED_API
inline std::ostream& operator<<(std::ostream& out, error_code error) noexcept {
return out << error_message(error);
}
namespace internal {
//
// internal::simdjson_result_base<T> inline implementation
//
template<typename T>
simdjson_inline void simdjson_result_base<T>::tie(T &value, error_code &error) && noexcept {
error = this->second;
if (!error) {
value = std::forward<simdjson_result_base<T>>(*this).first;
}
}
template<typename T>
simdjson_warn_unused simdjson_inline error_code simdjson_result_base<T>::get(T &value) && noexcept {
error_code error;
std::forward<simdjson_result_base<T>>(*this).tie(value, error);
return error;
}
template<typename T>
simdjson_inline error_code simdjson_result_base<T>::error() const noexcept {
return this->second;
}
#if SIMDJSON_EXCEPTIONS
template<typename T>
simdjson_inline T& simdjson_result_base<T>::value() & noexcept(false) {
if (error()) { throw simdjson_error(error()); }
return this->first;
}
template<typename T>
simdjson_inline T&& simdjson_result_base<T>::value() && noexcept(false) {
return std::forward<simdjson_result_base<T>>(*this).take_value();
}
template<typename T>
simdjson_inline T&& simdjson_result_base<T>::take_value() && noexcept(false) {
if (error()) { throw simdjson_error(error()); }
return std::forward<T>(this->first);
}
template<typename T>
simdjson_inline simdjson_result_base<T>::operator T&&() && noexcept(false) {
return std::forward<simdjson_result_base<T>>(*this).take_value();
}
#endif // SIMDJSON_EXCEPTIONS
template<typename T>
simdjson_inline const T& simdjson_result_base<T>::value_unsafe() const& noexcept {
return this->first;
}
template<typename T>
simdjson_inline T&& simdjson_result_base<T>::value_unsafe() && noexcept {
return std::forward<T>(this->first);
}
template<typename T>
simdjson_inline simdjson_result_base<T>::simdjson_result_base(T &&value, error_code error) noexcept
: std::pair<T, error_code>(std::forward<T>(value), error) {}
template<typename T>
simdjson_inline simdjson_result_base<T>::simdjson_result_base(error_code error) noexcept
: simdjson_result_base(T{}, error) {}
template<typename T>
simdjson_inline simdjson_result_base<T>::simdjson_result_base(T &&value) noexcept
: simdjson_result_base(std::forward<T>(value), SUCCESS) {}
template<typename T>
simdjson_inline simdjson_result_base<T>::simdjson_result_base() noexcept
: simdjson_result_base(T{}, UNINITIALIZED) {}
} // namespace internal
///
/// simdjson_result<T> inline implementation
///
template<typename T>
simdjson_inline void simdjson_result<T>::tie(T &value, error_code &error) && noexcept {
std::forward<internal::simdjson_result_base<T>>(*this).tie(value, error);
}
template<typename T>
simdjson_warn_unused simdjson_inline error_code simdjson_result<T>::get(T &value) && noexcept {
return std::forward<internal::simdjson_result_base<T>>(*this).get(value);
}
template<typename T>
simdjson_inline error_code simdjson_result<T>::error() const noexcept {
return internal::simdjson_result_base<T>::error();
}
#if SIMDJSON_EXCEPTIONS
template<typename T>
simdjson_inline T& simdjson_result<T>::value() & noexcept(false) {
return internal::simdjson_result_base<T>::value();
}
template<typename T>
simdjson_inline T&& simdjson_result<T>::value() && noexcept(false) {
return std::forward<internal::simdjson_result_base<T>>(*this).value();
}
template<typename T>
simdjson_inline T&& simdjson_result<T>::take_value() && noexcept(false) {
return std::forward<internal::simdjson_result_base<T>>(*this).take_value();
}
template<typename T>
simdjson_inline simdjson_result<T>::operator T&&() && noexcept(false) {
return std::forward<internal::simdjson_result_base<T>>(*this).take_value();
}
#endif // SIMDJSON_EXCEPTIONS
template<typename T>
simdjson_inline const T& simdjson_result<T>::value_unsafe() const& noexcept {
return internal::simdjson_result_base<T>::value_unsafe();
}
template<typename T>
simdjson_inline T&& simdjson_result<T>::value_unsafe() && noexcept {
return std::forward<internal::simdjson_result_base<T>>(*this).value_unsafe();
}
template<typename T>
simdjson_inline simdjson_result<T>::simdjson_result(T &&value, error_code error) noexcept
: internal::simdjson_result_base<T>(std::forward<T>(value), error) {}
template<typename T>
simdjson_inline simdjson_result<T>::simdjson_result(error_code error) noexcept
: internal::simdjson_result_base<T>(error) {}
template<typename T>
simdjson_inline simdjson_result<T>::simdjson_result(T &&value) noexcept
: internal::simdjson_result_base<T>(std::forward<T>(value)) {}
template<typename T>
simdjson_inline simdjson_result<T>::simdjson_result() noexcept
: internal::simdjson_result_base<T>() {}
} // namespace simdjson
#endif // SIMDJSON_ERROR_INL_H
/* end file simdjson/error-inl.h */
namespace simdjson {
namespace internal {
SIMDJSON_DLLIMPORTEXPORT const error_code_info error_codes[] {
{ SUCCESS, "SUCCESS: No error" },
{ CAPACITY, "CAPACITY: This parser can't support a document that big" },
{ MEMALLOC, "MEMALLOC: Error allocating memory, we're most likely out of memory" },
{ TAPE_ERROR, "TAPE_ERROR: The JSON document has an improper structure: missing or superfluous commas, braces, missing keys, etc." },
{ DEPTH_ERROR, "DEPTH_ERROR: The JSON document was too deep (too many nested objects and arrays)" },
{ STRING_ERROR, "STRING_ERROR: Problem while parsing a string" },
{ T_ATOM_ERROR, "T_ATOM_ERROR: Problem while parsing an atom starting with the letter 't'" },
{ F_ATOM_ERROR, "F_ATOM_ERROR: Problem while parsing an atom starting with the letter 'f'" },
{ N_ATOM_ERROR, "N_ATOM_ERROR: Problem while parsing an atom starting with the letter 'n'" },
{ NUMBER_ERROR, "NUMBER_ERROR: Problem while parsing a number" },
{ BIGINT_ERROR, "BIGINT_ERROR: Big integer value that cannot be represented using 64 bits" },
{ UTF8_ERROR, "UTF8_ERROR: The input is not valid UTF-8" },
{ UNINITIALIZED, "UNINITIALIZED: Uninitialized" },
{ EMPTY, "EMPTY: no JSON found" },
{ UNESCAPED_CHARS, "UNESCAPED_CHARS: Within strings, some characters must be escaped, we found unescaped characters" },
{ UNCLOSED_STRING, "UNCLOSED_STRING: A string is opened, but never closed." },
{ UNSUPPORTED_ARCHITECTURE, "UNSUPPORTED_ARCHITECTURE: simdjson does not have an implementation supported by this CPU architecture. Please report this error to the core team as it should never happen." },
{ INCORRECT_TYPE, "INCORRECT_TYPE: The JSON element does not have the requested type." },
{ NUMBER_OUT_OF_RANGE, "NUMBER_OUT_OF_RANGE: The JSON number is too large or too small to fit within the requested type." },
{ INDEX_OUT_OF_BOUNDS, "INDEX_OUT_OF_BOUNDS: Attempted to access an element of a JSON array that is beyond its length." },
{ NO_SUCH_FIELD, "NO_SUCH_FIELD: The JSON field referenced does not exist in this object." },
{ IO_ERROR, "IO_ERROR: Error reading the file." },
{ INVALID_JSON_POINTER, "INVALID_JSON_POINTER: Invalid JSON pointer syntax." },
{ INVALID_URI_FRAGMENT, "INVALID_URI_FRAGMENT: Invalid URI fragment syntax." },
{ UNEXPECTED_ERROR, "UNEXPECTED_ERROR: Unexpected error, consider reporting this problem as you may have found a bug in simdjson" },
{ PARSER_IN_USE, "PARSER_IN_USE: Cannot parse a new document while a document is still in use." },
{ OUT_OF_ORDER_ITERATION, "OUT_OF_ORDER_ITERATION: Objects and arrays can only be iterated when they are first encountered." },
{ INSUFFICIENT_PADDING, "INSUFFICIENT_PADDING: simdjson requires the input JSON string to have at least SIMDJSON_PADDING extra bytes allocated, beyond the string's length. Consider using the simdjson::padded_string class if needed." },
{ INCOMPLETE_ARRAY_OR_OBJECT, "INCOMPLETE_ARRAY_OR_OBJECT: JSON document ended early in the middle of an object or array." },
{ SCALAR_DOCUMENT_AS_VALUE, "SCALAR_DOCUMENT_AS_VALUE: A JSON document made of a scalar (number, Boolean, null or string) is treated as a value. Use get_bool(), get_double(), etc. on the document instead. "},
{ OUT_OF_BOUNDS, "OUT_OF_BOUNDS: Attempt to access location outside of document."},
{ TRAILING_CONTENT, "TRAILING_CONTENT: Unexpected trailing content in the JSON input."}
}; // error_messages[]
} // namespace internal
} // namespace simdjson
#endif // SIMDJSON_SRC_ERROR_TABLES_CPP
/* end file internal/error_tables.cpp */
/* including internal/jsoncharutils_tables.cpp: #include <internal/jsoncharutils_tables.cpp> */
/* begin file internal/jsoncharutils_tables.cpp */
#ifndef SIMDJSON_SRC_JSONCHARUTILS_TABLES_CPP
#define SIMDJSON_SRC_JSONCHARUTILS_TABLES_CPP
/* skipped duplicate #include <simdjson/base.h> */
namespace simdjson {
namespace internal {
// structural chars here are
// they are { 0x7b } 0x7d : 0x3a [ 0x5b ] 0x5d , 0x2c (and NULL)
// we are also interested in the four whitespace characters
// space 0x20, linefeed 0x0a, horizontal tab 0x09 and carriage return 0x0d
SIMDJSON_DLLIMPORTEXPORT const bool structural_or_whitespace_negated[256] = {
1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1};
SIMDJSON_DLLIMPORTEXPORT const bool structural_or_whitespace[256] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
SIMDJSON_DLLIMPORTEXPORT const uint32_t digit_to_val32[886] = {
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0x0, 0x1, 0x2, 0x3, 0x4, 0x5,
0x6, 0x7, 0x8, 0x9, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xa,
0xb, 0xc, 0xd, 0xe, 0xf, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xa, 0xb, 0xc, 0xd, 0xe,
0xf, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0x0, 0x10, 0x20, 0x30, 0x40, 0x50,
0x60, 0x70, 0x80, 0x90, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xa0,
0xb0, 0xc0, 0xd0, 0xe0, 0xf0, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xa0, 0xb0, 0xc0, 0xd0, 0xe0,
0xf0, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0x0, 0x100, 0x200, 0x300, 0x400, 0x500,
0x600, 0x700, 0x800, 0x900, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xa00,
0xb00, 0xc00, 0xd00, 0xe00, 0xf00, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xa00, 0xb00, 0xc00, 0xd00, 0xe00,
0xf00, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0x0, 0x1000, 0x2000, 0x3000, 0x4000, 0x5000,
0x6000, 0x7000, 0x8000, 0x9000, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xa000,
0xb000, 0xc000, 0xd000, 0xe000, 0xf000, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xa000, 0xb000, 0xc000, 0xd000, 0xe000,
0xf000, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF,
0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF};
} // namespace internal
} // namespace simdjson
#endif // SIMDJSON_SRC_JSONCHARUTILS_TABLES_CPP
/* end file internal/jsoncharutils_tables.cpp */
/* including internal/numberparsing_tables.cpp: #include <internal/numberparsing_tables.cpp> */
/* begin file internal/numberparsing_tables.cpp */
#ifndef SIMDJSON_SRC_NUMBERPARSING_TABLES_CPP
#define SIMDJSON_SRC_NUMBERPARSING_TABLES_CPP
/* skipped duplicate #include <simdjson/base.h> */
/* including simdjson/internal/numberparsing_tables.h: #include <simdjson/internal/numberparsing_tables.h> */
/* begin file simdjson/internal/numberparsing_tables.h */
#ifndef SIMDJSON_INTERNAL_NUMBERPARSING_TABLES_H
#define SIMDJSON_INTERNAL_NUMBERPARSING_TABLES_H
/* skipped duplicate #include "simdjson/base.h" */
namespace simdjson {
namespace internal {
/**
* The smallest non-zero float (binary64) is 2^-1074.
* We take as input numbers of the form w x 10^q where w < 2^64.
* We have that w * 10^-343 < 2^(64-344) 5^-343 < 2^-1076.
* However, we have that
* (2^64-1) * 10^-342 = (2^64-1) * 2^-342 * 5^-342 > 2^-1074.
* Thus it is possible for a number of the form w * 10^-342 where
* w is a 64-bit value to be a non-zero floating-point number.
*********
* Any number of form w * 10^309 where w>= 1 is going to be
* infinite in binary64 so we never need to worry about powers
* of 5 greater than 308.
*/
constexpr int smallest_power = -342;
constexpr int largest_power = 308;
/**
* Represents a 128-bit value.
* low: least significant 64 bits.
* high: most significant 64 bits.
*/
struct value128 {
uint64_t low;
uint64_t high;
};
// Precomputed powers of ten from 10^0 to 10^22. These
// can be represented exactly using the double type.
extern SIMDJSON_DLLIMPORTEXPORT const double power_of_ten[];
/**
* When mapping numbers from decimal to binary,
* we go from w * 10^q to m * 2^p but we have
* 10^q = 5^q * 2^q, so effectively
* we are trying to match
* w * 2^q * 5^q to m * 2^p. Thus the powers of two
* are not a concern since they can be represented
* exactly using the binary notation, only the powers of five
* affect the binary significand.
*/
// The truncated powers of five from 5^-342 all the way to 5^308
// The mantissa is truncated to 128 bits, and
// never rounded up. Uses about 10KB.
extern SIMDJSON_DLLIMPORTEXPORT const uint64_t power_of_five_128[];
} // namespace internal
} // namespace simdjson
#endif // SIMDJSON_INTERNAL_NUMBERPARSING_TABLES_H
/* end file simdjson/internal/numberparsing_tables.h */
// Precomputed powers of ten from 10^0 to 10^22. These
// can be represented exactly using the double type.
SIMDJSON_DLLIMPORTEXPORT const double simdjson::internal::power_of_ten[] = {
1e0, 1e1, 1e2, 1e3, 1e4, 1e5, 1e6, 1e7, 1e8, 1e9, 1e10, 1e11,
1e12, 1e13, 1e14, 1e15, 1e16, 1e17, 1e18, 1e19, 1e20, 1e21, 1e22};
/**
* When mapping numbers from decimal to binary,
* we go from w * 10^q to m * 2^p but we have
* 10^q = 5^q * 2^q, so effectively
* we are trying to match
* w * 2^q * 5^q to m * 2^p. Thus the powers of two
* are not a concern since they can be represented
* exactly using the binary notation, only the powers of five
* affect the binary significand.
*/
// The truncated powers of five from 5^-342 all the way to 5^308
// The mantissa is truncated to 128 bits, and
// never rounded up. Uses about 10KB.
SIMDJSON_DLLIMPORTEXPORT const uint64_t simdjson::internal::power_of_five_128[]= {
0xeef453d6923bd65a,0x113faa2906a13b3f,
0x9558b4661b6565f8,0x4ac7ca59a424c507,
0xbaaee17fa23ebf76,0x5d79bcf00d2df649,
0xe95a99df8ace6f53,0xf4d82c2c107973dc,
0x91d8a02bb6c10594,0x79071b9b8a4be869,
0xb64ec836a47146f9,0x9748e2826cdee284,
0xe3e27a444d8d98b7,0xfd1b1b2308169b25,
0x8e6d8c6ab0787f72,0xfe30f0f5e50e20f7,
0xb208ef855c969f4f,0xbdbd2d335e51a935,
0xde8b2b66b3bc4723,0xad2c788035e61382,
0x8b16fb203055ac76,0x4c3bcb5021afcc31,
0xaddcb9e83c6b1793,0xdf4abe242a1bbf3d,
0xd953e8624b85dd78,0xd71d6dad34a2af0d,
0x87d4713d6f33aa6b,0x8672648c40e5ad68,
0xa9c98d8ccb009506,0x680efdaf511f18c2,
0xd43bf0effdc0ba48,0x212bd1b2566def2,
0x84a57695fe98746d,0x14bb630f7604b57,
0xa5ced43b7e3e9188,0x419ea3bd35385e2d,
0xcf42894a5dce35ea,0x52064cac828675b9,
0x818995ce7aa0e1b2,0x7343efebd1940993,
0xa1ebfb4219491a1f,0x1014ebe6c5f90bf8,
0xca66fa129f9b60a6,0xd41a26e077774ef6,
0xfd00b897478238d0,0x8920b098955522b4,
0x9e20735e8cb16382,0x55b46e5f5d5535b0,
0xc5a890362fddbc62,0xeb2189f734aa831d,
0xf712b443bbd52b7b,0xa5e9ec7501d523e4,
0x9a6bb0aa55653b2d,0x47b233c92125366e,
0xc1069cd4eabe89f8,0x999ec0bb696e840a,
0xf148440a256e2c76,0xc00670ea43ca250d,
0x96cd2a865764dbca,0x380406926a5e5728,
0xbc807527ed3e12bc,0xc605083704f5ecf2,
0xeba09271e88d976b,0xf7864a44c633682e,
0x93445b8731587ea3,0x7ab3ee6afbe0211d,
0xb8157268fdae9e4c,0x5960ea05bad82964,
0xe61acf033d1a45df,0x6fb92487298e33bd,
0x8fd0c16206306bab,0xa5d3b6d479f8e056,
0xb3c4f1ba87bc8696,0x8f48a4899877186c,
0xe0b62e2929aba83c,0x331acdabfe94de87,
0x8c71dcd9ba0b4925,0x9ff0c08b7f1d0b14,
0xaf8e5410288e1b6f,0x7ecf0ae5ee44dd9,
0xdb71e91432b1a24a,0xc9e82cd9f69d6150,
0x892731ac9faf056e,0xbe311c083a225cd2,
0xab70fe17c79ac6ca,0x6dbd630a48aaf406,
0xd64d3d9db981787d,0x92cbbccdad5b108,
0x85f0468293f0eb4e,0x25bbf56008c58ea5,
0xa76c582338ed2621,0xaf2af2b80af6f24e,
0xd1476e2c07286faa,0x1af5af660db4aee1,
0x82cca4db847945ca,0x50d98d9fc890ed4d,
0xa37fce126597973c,0xe50ff107bab528a0,
0xcc5fc196fefd7d0c,0x1e53ed49a96272c8,
0xff77b1fcbebcdc4f,0x25e8e89c13bb0f7a,
0x9faacf3df73609b1,0x77b191618c54e9ac,
0xc795830d75038c1d,0xd59df5b9ef6a2417,
0xf97ae3d0d2446f25,0x4b0573286b44ad1d,
0x9becce62836ac577,0x4ee367f9430aec32,
0xc2e801fb244576d5,0x229c41f793cda73f,
0xf3a20279ed56d48a,0x6b43527578c1110f,
0x9845418c345644d6,0x830a13896b78aaa9,
0xbe5691ef416bd60c,0x23cc986bc656d553,
0xedec366b11c6cb8f,0x2cbfbe86b7ec8aa8,
0x94b3a202eb1c3f39,0x7bf7d71432f3d6a9,
0xb9e08a83a5e34f07,0xdaf5ccd93fb0cc53,
0xe858ad248f5c22c9,0xd1b3400f8f9cff68,
0x91376c36d99995be,0x23100809b9c21fa1,
0xb58547448ffffb2d,0xabd40a0c2832a78a,
0xe2e69915b3fff9f9,0x16c90c8f323f516c,
0x8dd01fad907ffc3b,0xae3da7d97f6792e3,
0xb1442798f49ffb4a,0x99cd11cfdf41779c,
0xdd95317f31c7fa1d,0x40405643d711d583,
0x8a7d3eef7f1cfc52,0x482835ea666b2572,
0xad1c8eab5ee43b66,0xda3243650005eecf,
0xd863b256369d4a40,0x90bed43e40076a82,
0x873e4f75e2224e68,0x5a7744a6e804a291,
0xa90de3535aaae202,0x711515d0a205cb36,
0xd3515c2831559a83,0xd5a5b44ca873e03,
0x8412d9991ed58091,0xe858790afe9486c2,
0xa5178fff668ae0b6,0x626e974dbe39a872,
0xce5d73ff402d98e3,0xfb0a3d212dc8128f,
0x80fa687f881c7f8e,0x7ce66634bc9d0b99,
0xa139029f6a239f72,0x1c1fffc1ebc44e80,
0xc987434744ac874e,0xa327ffb266b56220,
0xfbe9141915d7a922,0x4bf1ff9f0062baa8,
0x9d71ac8fada6c9b5,0x6f773fc3603db4a9,
0xc4ce17b399107c22,0xcb550fb4384d21d3,
0xf6019da07f549b2b,0x7e2a53a146606a48,
0x99c102844f94e0fb,0x2eda7444cbfc426d,
0xc0314325637a1939,0xfa911155fefb5308,
0xf03d93eebc589f88,0x793555ab7eba27ca,
0x96267c7535b763b5,0x4bc1558b2f3458de,
0xbbb01b9283253ca2,0x9eb1aaedfb016f16,
0xea9c227723ee8bcb,0x465e15a979c1cadc,
0x92a1958a7675175f,0xbfacd89ec191ec9,
0xb749faed14125d36,0xcef980ec671f667b,
0xe51c79a85916f484,0x82b7e12780e7401a,
0x8f31cc0937ae58d2,0xd1b2ecb8b0908810,
0xb2fe3f0b8599ef07,0x861fa7e6dcb4aa15,
0xdfbdcece67006ac9,0x67a791e093e1d49a,
0x8bd6a141006042bd,0xe0c8bb2c5c6d24e0,
0xaecc49914078536d,0x58fae9f773886e18,
0xda7f5bf590966848,0xaf39a475506a899e,
0x888f99797a5e012d,0x6d8406c952429603,
0xaab37fd7d8f58178,0xc8e5087ba6d33b83,
0xd5605fcdcf32e1d6,0xfb1e4a9a90880a64,
0x855c3be0a17fcd26,0x5cf2eea09a55067f,
0xa6b34ad8c9dfc06f,0xf42faa48c0ea481e,
0xd0601d8efc57b08b,0xf13b94daf124da26,
0x823c12795db6ce57,0x76c53d08d6b70858,
0xa2cb1717b52481ed,0x54768c4b0c64ca6e,
0xcb7ddcdda26da268,0xa9942f5dcf7dfd09,
0xfe5d54150b090b02,0xd3f93b35435d7c4c,
0x9efa548d26e5a6e1,0xc47bc5014a1a6daf,
0xc6b8e9b0709f109a,0x359ab6419ca1091b,
0xf867241c8cc6d4c0,0xc30163d203c94b62,
0x9b407691d7fc44f8,0x79e0de63425dcf1d,
0xc21094364dfb5636,0x985915fc12f542e4,
0xf294b943e17a2bc4,0x3e6f5b7b17b2939d,
0x979cf3ca6cec5b5a,0xa705992ceecf9c42,
0xbd8430bd08277231,0x50c6ff782a838353,
0xece53cec4a314ebd,0xa4f8bf5635246428,
0x940f4613ae5ed136,0x871b7795e136be99,
0xb913179899f68584,0x28e2557b59846e3f,
0xe757dd7ec07426e5,0x331aeada2fe589cf,
0x9096ea6f3848984f,0x3ff0d2c85def7621,
0xb4bca50b065abe63,0xfed077a756b53a9,
0xe1ebce4dc7f16dfb,0xd3e8495912c62894,
0x8d3360f09cf6e4bd,0x64712dd7abbbd95c,
0xb080392cc4349dec,0xbd8d794d96aacfb3,
0xdca04777f541c567,0xecf0d7a0fc5583a0,
0x89e42caaf9491b60,0xf41686c49db57244,
0xac5d37d5b79b6239,0x311c2875c522ced5,
0xd77485cb25823ac7,0x7d633293366b828b,
0x86a8d39ef77164bc,0xae5dff9c02033197,
0xa8530886b54dbdeb,0xd9f57f830283fdfc,
0xd267caa862a12d66,0xd072df63c324fd7b,
0x8380dea93da4bc60,0x4247cb9e59f71e6d,
0xa46116538d0deb78,0x52d9be85f074e608,
0xcd795be870516656,0x67902e276c921f8b,
0x806bd9714632dff6,0xba1cd8a3db53b6,
0xa086cfcd97bf97f3,0x80e8a40eccd228a4,
0xc8a883c0fdaf7df0,0x6122cd128006b2cd,
0xfad2a4b13d1b5d6c,0x796b805720085f81,
0x9cc3a6eec6311a63,0xcbe3303674053bb0,
0xc3f490aa77bd60fc,0xbedbfc4411068a9c,
0xf4f1b4d515acb93b,0xee92fb5515482d44,
0x991711052d8bf3c5,0x751bdd152d4d1c4a,
0xbf5cd54678eef0b6,0xd262d45a78a0635d,
0xef340a98172aace4,0x86fb897116c87c34,
0x9580869f0e7aac0e,0xd45d35e6ae3d4da0,
0xbae0a846d2195712,0x8974836059cca109,
0xe998d258869facd7,0x2bd1a438703fc94b,
0x91ff83775423cc06,0x7b6306a34627ddcf,
0xb67f6455292cbf08,0x1a3bc84c17b1d542,
0xe41f3d6a7377eeca,0x20caba5f1d9e4a93,
0x8e938662882af53e,0x547eb47b7282ee9c,
0xb23867fb2a35b28d,0xe99e619a4f23aa43,
0xdec681f9f4c31f31,0x6405fa00e2ec94d4,
0x8b3c113c38f9f37e,0xde83bc408dd3dd04,
0xae0b158b4738705e,0x9624ab50b148d445,
0xd98ddaee19068c76,0x3badd624dd9b0957,
0x87f8a8d4cfa417c9,0xe54ca5d70a80e5d6,
0xa9f6d30a038d1dbc,0x5e9fcf4ccd211f4c,
0xd47487cc8470652b,0x7647c3200069671f,
0x84c8d4dfd2c63f3b,0x29ecd9f40041e073,
0xa5fb0a17c777cf09,0xf468107100525890,
0xcf79cc9db955c2cc,0x7182148d4066eeb4,
0x81ac1fe293d599bf,0xc6f14cd848405530,
0xa21727db38cb002f,0xb8ada00e5a506a7c,
0xca9cf1d206fdc03b,0xa6d90811f0e4851c,
0xfd442e4688bd304a,0x908f4a166d1da663,
0x9e4a9cec15763e2e,0x9a598e4e043287fe,
0xc5dd44271ad3cdba,0x40eff1e1853f29fd,
0xf7549530e188c128,0xd12bee59e68ef47c,
0x9a94dd3e8cf578b9,0x82bb74f8301958ce,
0xc13a148e3032d6e7,0xe36a52363c1faf01,
0xf18899b1bc3f8ca1,0xdc44e6c3cb279ac1,
0x96f5600f15a7b7e5,0x29ab103a5ef8c0b9,
0xbcb2b812db11a5de,0x7415d448f6b6f0e7,
0xebdf661791d60f56,0x111b495b3464ad21,
0x936b9fcebb25c995,0xcab10dd900beec34,
0xb84687c269ef3bfb,0x3d5d514f40eea742,
0xe65829b3046b0afa,0xcb4a5a3112a5112,
0x8ff71a0fe2c2e6dc,0x47f0e785eaba72ab,
0xb3f4e093db73a093,0x59ed216765690f56,
0xe0f218b8d25088b8,0x306869c13ec3532c,
0x8c974f7383725573,0x1e414218c73a13fb,
0xafbd2350644eeacf,0xe5d1929ef90898fa,
0xdbac6c247d62a583,0xdf45f746b74abf39,
0x894bc396ce5da772,0x6b8bba8c328eb783,
0xab9eb47c81f5114f,0x66ea92f3f326564,
0xd686619ba27255a2,0xc80a537b0efefebd,
0x8613fd0145877585,0xbd06742ce95f5f36,
0xa798fc4196e952e7,0x2c48113823b73704,
0xd17f3b51fca3a7a0,0xf75a15862ca504c5,
0x82ef85133de648c4,0x9a984d73dbe722fb,
0xa3ab66580d5fdaf5,0xc13e60d0d2e0ebba,
0xcc963fee10b7d1b3,0x318df905079926a8,
0xffbbcfe994e5c61f,0xfdf17746497f7052,
0x9fd561f1fd0f9bd3,0xfeb6ea8bedefa633,
0xc7caba6e7c5382c8,0xfe64a52ee96b8fc0,
0xf9bd690a1b68637b,0x3dfdce7aa3c673b0,
0x9c1661a651213e2d,0x6bea10ca65c084e,
0xc31bfa0fe5698db8,0x486e494fcff30a62,
0xf3e2f893dec3f126,0x5a89dba3c3efccfa,
0x986ddb5c6b3a76b7,0xf89629465a75e01c,
0xbe89523386091465,0xf6bbb397f1135823,
0xee2ba6c0678b597f,0x746aa07ded582e2c,
0x94db483840b717ef,0xa8c2a44eb4571cdc,
0xba121a4650e4ddeb,0x92f34d62616ce413,
0xe896a0d7e51e1566,0x77b020baf9c81d17,
0x915e2486ef32cd60,0xace1474dc1d122e,
0xb5b5ada8aaff80b8,0xd819992132456ba,
0xe3231912d5bf60e6,0x10e1fff697ed6c69,
0x8df5efabc5979c8f,0xca8d3ffa1ef463c1,
0xb1736b96b6fd83b3,0xbd308ff8a6b17cb2,
0xddd0467c64bce4a0,0xac7cb3f6d05ddbde,
0x8aa22c0dbef60ee4,0x6bcdf07a423aa96b,
0xad4ab7112eb3929d,0x86c16c98d2c953c6,
0xd89d64d57a607744,0xe871c7bf077ba8b7,
0x87625f056c7c4a8b,0x11471cd764ad4972,
0xa93af6c6c79b5d2d,0xd598e40d3dd89bcf,
0xd389b47879823479,0x4aff1d108d4ec2c3,
0x843610cb4bf160cb,0xcedf722a585139ba,
0xa54394fe1eedb8fe,0xc2974eb4ee658828,
0xce947a3da6a9273e,0x733d226229feea32,
0x811ccc668829b887,0x806357d5a3f525f,
0xa163ff802a3426a8,0xca07c2dcb0cf26f7,
0xc9bcff6034c13052,0xfc89b393dd02f0b5,
0xfc2c3f3841f17c67,0xbbac2078d443ace2,
0x9d9ba7832936edc0,0xd54b944b84aa4c0d,
0xc5029163f384a931,0xa9e795e65d4df11,
0xf64335bcf065d37d,0x4d4617b5ff4a16d5,
0x99ea0196163fa42e,0x504bced1bf8e4e45,
0xc06481fb9bcf8d39,0xe45ec2862f71e1d6,
0xf07da27a82c37088,0x5d767327bb4e5a4c,
0x964e858c91ba2655,0x3a6a07f8d510f86f,
0xbbe226efb628afea,0x890489f70a55368b,
0xeadab0aba3b2dbe5,0x2b45ac74ccea842e,
0x92c8ae6b464fc96f,0x3b0b8bc90012929d,
0xb77ada0617e3bbcb,0x9ce6ebb40173744,
0xe55990879ddcaabd,0xcc420a6a101d0515,
0x8f57fa54c2a9eab6,0x9fa946824a12232d,
0xb32df8e9f3546564,0x47939822dc96abf9,
0xdff9772470297ebd,0x59787e2b93bc56f7,
0x8bfbea76c619ef36,0x57eb4edb3c55b65a,
0xaefae51477a06b03,0xede622920b6b23f1,
0xdab99e59958885c4,0xe95fab368e45eced,
0x88b402f7fd75539b,0x11dbcb0218ebb414,
0xaae103b5fcd2a881,0xd652bdc29f26a119,
0xd59944a37c0752a2,0x4be76d3346f0495f,
0x857fcae62d8493a5,0x6f70a4400c562ddb,
0xa6dfbd9fb8e5b88e,0xcb4ccd500f6bb952,
0xd097ad07a71f26b2,0x7e2000a41346a7a7,
0x825ecc24c873782f,0x8ed400668c0c28c8,
0xa2f67f2dfa90563b,0x728900802f0f32fa,
0xcbb41ef979346bca,0x4f2b40a03ad2ffb9,
0xfea126b7d78186bc,0xe2f610c84987bfa8,
0x9f24b832e6b0f436,0xdd9ca7d2df4d7c9,
0xc6ede63fa05d3143,0x91503d1c79720dbb,
0xf8a95fcf88747d94,0x75a44c6397ce912a,
0x9b69dbe1b548ce7c,0xc986afbe3ee11aba,
0xc24452da229b021b,0xfbe85badce996168,
0xf2d56790ab41c2a2,0xfae27299423fb9c3,
0x97c560ba6b0919a5,0xdccd879fc967d41a,
0xbdb6b8e905cb600f,0x5400e987bbc1c920,
0xed246723473e3813,0x290123e9aab23b68,
0x9436c0760c86e30b,0xf9a0b6720aaf6521,
0xb94470938fa89bce,0xf808e40e8d5b3e69,
0xe7958cb87392c2c2,0xb60b1d1230b20e04,
0x90bd77f3483bb9b9,0xb1c6f22b5e6f48c2,
0xb4ecd5f01a4aa828,0x1e38aeb6360b1af3,
0xe2280b6c20dd5232,0x25c6da63c38de1b0,
0x8d590723948a535f,0x579c487e5a38ad0e,
0xb0af48ec79ace837,0x2d835a9df0c6d851,
0xdcdb1b2798182244,0xf8e431456cf88e65,
0x8a08f0f8bf0f156b,0x1b8e9ecb641b58ff,
0xac8b2d36eed2dac5,0xe272467e3d222f3f,
0xd7adf884aa879177,0x5b0ed81dcc6abb0f,
0x86ccbb52ea94baea,0x98e947129fc2b4e9,
0xa87fea27a539e9a5,0x3f2398d747b36224,
0xd29fe4b18e88640e,0x8eec7f0d19a03aad,
0x83a3eeeef9153e89,0x1953cf68300424ac,
0xa48ceaaab75a8e2b,0x5fa8c3423c052dd7,
0xcdb02555653131b6,0x3792f412cb06794d,
0x808e17555f3ebf11,0xe2bbd88bbee40bd0,
0xa0b19d2ab70e6ed6,0x5b6aceaeae9d0ec4,
0xc8de047564d20a8b,0xf245825a5a445275,
0xfb158592be068d2e,0xeed6e2f0f0d56712,
0x9ced737bb6c4183d,0x55464dd69685606b,
0xc428d05aa4751e4c,0xaa97e14c3c26b886,
0xf53304714d9265df,0xd53dd99f4b3066a8,
0x993fe2c6d07b7fab,0xe546a8038efe4029,
0xbf8fdb78849a5f96,0xde98520472bdd033,
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0xbb127c53b17ec159,0x5560c018580d5d52,
0xe9d71b689dde71af,0xaab8f01e6e10b4a6,
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0xb6b00d69bb55c8d1,0x3d607b97c5fd0d22,
0xe45c10c42a2b3b05,0x8cb89a7db77c506a,
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0xb267ed1940f1c61c,0x55f038b237591ed3,
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0x84ec3c97da624ab4,0xbd5af13bef0b113e,
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0xcfb11ead453994ba,0x67de18eda5814af2,
0x81ceb32c4b43fcf4,0x80eacf948770ced7,
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0x9abe14cd44753b52,0xc4926a9672793580,
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0xf1c90080baf72cb1,0x5324c68b12dd6800,
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0xbce5086492111aea,0x88f4bb1ca6bd0000,
0xec1e4a7db69561a5,0x2b31e9e3d0700000,
0x9392ee8e921d5d07,0x3aff322e62600000,
0xb877aa3236a4b449,0x9befeb9fad487c3,
0xe69594bec44de15b,0x4c2ebe687989a9b4,
0x901d7cf73ab0acd9,0xf9d37014bf60a11,
0xb424dc35095cd80f,0x538484c19ef38c95,
0xe12e13424bb40e13,0x2865a5f206b06fba,
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0x89705f4136b4a597,0x31680a88f8953031,
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0x8637bd05af6c69b5,0xa63f9a49c2c1b110,
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0xd1b71758e219652b,0xd3c36113404ea4a9,
0x83126e978d4fdf3b,0x645a1cac083126ea,
0xa3d70a3d70a3d70a,0x3d70a3d70a3d70a4,
0xcccccccccccccccc,0xcccccccccccccccd,
0x8000000000000000,0x0,
0xa000000000000000,0x0,
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0xfa00000000000000,0x0,
0x9c40000000000000,0x0,
0xc350000000000000,0x0,
0xf424000000000000,0x0,
0x9896800000000000,0x0,
0xbebc200000000000,0x0,
0xee6b280000000000,0x0,
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0xba43b74000000000,0x0,
0xe8d4a51000000000,0x0,
0x9184e72a00000000,0x0,
0xb5e620f480000000,0x0,
0xe35fa931a0000000,0x0,
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0xb1a2bc2ec5000000,0x0,
0xde0b6b3a76400000,0x0,
0x8ac7230489e80000,0x0,
0xad78ebc5ac620000,0x0,
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0x878678326eac9000,0x0,
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0xd3c21bcecceda100,0x0,
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0xa56fa5b99019a5c8,0x0,
0xcecb8f27f4200f3a,0x0,
0x813f3978f8940984,0x4000000000000000,
0xa18f07d736b90be5,0x5000000000000000,
0xc9f2c9cd04674ede,0xa400000000000000,
0xfc6f7c4045812296,0x4d00000000000000,
0x9dc5ada82b70b59d,0xf020000000000000,
0xc5371912364ce305,0x6c28000000000000,
0xf684df56c3e01bc6,0xc732000000000000,
0x9a130b963a6c115c,0x3c7f400000000000,
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0xf0bdc21abb48db20,0x1e86d40000000000,
0x96769950b50d88f4,0x1314448000000000,
0xbc143fa4e250eb31,0x17d955a000000000,
0xeb194f8e1ae525fd,0x5dcfab0800000000,
0x92efd1b8d0cf37be,0x5aa1cae500000000,
0xb7abc627050305ad,0xf14a3d9e40000000,
0xe596b7b0c643c719,0x6d9ccd05d0000000,
0x8f7e32ce7bea5c6f,0xe4820023a2000000,
0xb35dbf821ae4f38b,0xdda2802c8a800000,
0xe0352f62a19e306e,0xd50b2037ad200000,
0x8c213d9da502de45,0x4526f422cc340000,
0xaf298d050e4395d6,0x9670b12b7f410000,
0xdaf3f04651d47b4c,0x3c0cdd765f114000,
0x88d8762bf324cd0f,0xa5880a69fb6ac800,
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0x85a36366eb71f041,0x47a6da2b7f864750,
0xa70c3c40a64e6c51,0x999090b65f67d924,
0xd0cf4b50cfe20765,0xfff4b4e3f741cf6d,
0x82818f1281ed449f,0xbff8f10e7a8921a4,
0xa321f2d7226895c7,0xaff72d52192b6a0d,
0xcbea6f8ceb02bb39,0x9bf4f8a69f764490,
0xfee50b7025c36a08,0x2f236d04753d5b4,
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0xf8ebad2b84e0d58b,0xd2e0898765a7deb2,
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0xc2781f49ffcfa6d5,0x3cbf6b71c76b25fb,
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0x97edd871cfda3a56,0x97758bf0e3cbb5ac,
0xbde94e8e43d0c8ec,0x3d52eeed1cbea317,
0xed63a231d4c4fb27,0x4ca7aaa863ee4bdd,
0x945e455f24fb1cf8,0x8fe8caa93e74ef6a,
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0xe7d34c64a9c85d44,0x60dbbca87196b616,
0x90e40fbeea1d3a4a,0xbc8955e946fe31cd,
0xb51d13aea4a488dd,0x6babab6398bdbe41,
0xe264589a4dcdab14,0xc696963c7eed2dd1,
0x8d7eb76070a08aec,0xfc1e1de5cf543ca2,
0xb0de65388cc8ada8,0x3b25a55f43294bcb,
0xdd15fe86affad912,0x49ef0eb713f39ebe,
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0xacb92ed9397bf996,0x49c2c37f07965404,
0xd7e77a8f87daf7fb,0xdc33745ec97be906,
0x86f0ac99b4e8dafd,0x69a028bb3ded71a3,
0xa8acd7c0222311bc,0xc40832ea0d68ce0c,
0xd2d80db02aabd62b,0xf50a3fa490c30190,
0x83c7088e1aab65db,0x792667c6da79e0fa,
0xa4b8cab1a1563f52,0x577001b891185938,
0xcde6fd5e09abcf26,0xed4c0226b55e6f86,
0x80b05e5ac60b6178,0x544f8158315b05b4,
0xa0dc75f1778e39d6,0x696361ae3db1c721,
0xc913936dd571c84c,0x3bc3a19cd1e38e9,
0xfb5878494ace3a5f,0x4ab48a04065c723,
0x9d174b2dcec0e47b,0x62eb0d64283f9c76,
0xc45d1df942711d9a,0x3ba5d0bd324f8394,
0xf5746577930d6500,0xca8f44ec7ee36479,
0x9968bf6abbe85f20,0x7e998b13cf4e1ecb,
0xbfc2ef456ae276e8,0x9e3fedd8c321a67e,
0xefb3ab16c59b14a2,0xc5cfe94ef3ea101e,
0x95d04aee3b80ece5,0xbba1f1d158724a12,
0xbb445da9ca61281f,0x2a8a6e45ae8edc97,
0xea1575143cf97226,0xf52d09d71a3293bd,
0x924d692ca61be758,0x593c2626705f9c56,
0xb6e0c377cfa2e12e,0x6f8b2fb00c77836c,
0xe498f455c38b997a,0xb6dfb9c0f956447,
0x8edf98b59a373fec,0x4724bd4189bd5eac,
0xb2977ee300c50fe7,0x58edec91ec2cb657,
0xdf3d5e9bc0f653e1,0x2f2967b66737e3ed,
0x8b865b215899f46c,0xbd79e0d20082ee74,
0xae67f1e9aec07187,0xecd8590680a3aa11,
0xda01ee641a708de9,0xe80e6f4820cc9495,
0x884134fe908658b2,0x3109058d147fdcdd,
0xaa51823e34a7eede,0xbd4b46f0599fd415,
0xd4e5e2cdc1d1ea96,0x6c9e18ac7007c91a,
0x850fadc09923329e,0x3e2cf6bc604ddb0,
0xa6539930bf6bff45,0x84db8346b786151c,
0xcfe87f7cef46ff16,0xe612641865679a63,
0x81f14fae158c5f6e,0x4fcb7e8f3f60c07e,
0xa26da3999aef7749,0xe3be5e330f38f09d,
0xcb090c8001ab551c,0x5cadf5bfd3072cc5,
0xfdcb4fa002162a63,0x73d9732fc7c8f7f6,
0x9e9f11c4014dda7e,0x2867e7fddcdd9afa,
0xc646d63501a1511d,0xb281e1fd541501b8,
0xf7d88bc24209a565,0x1f225a7ca91a4226,
0x9ae757596946075f,0x3375788de9b06958,
0xc1a12d2fc3978937,0x52d6b1641c83ae,
0xf209787bb47d6b84,0xc0678c5dbd23a49a,
0x9745eb4d50ce6332,0xf840b7ba963646e0,
0xbd176620a501fbff,0xb650e5a93bc3d898,
0xec5d3fa8ce427aff,0xa3e51f138ab4cebe,
0x93ba47c980e98cdf,0xc66f336c36b10137,
0xb8a8d9bbe123f017,0xb80b0047445d4184,
0xe6d3102ad96cec1d,0xa60dc059157491e5,
0x9043ea1ac7e41392,0x87c89837ad68db2f,
0xb454e4a179dd1877,0x29babe4598c311fb,
0xe16a1dc9d8545e94,0xf4296dd6fef3d67a,
0x8ce2529e2734bb1d,0x1899e4a65f58660c,
0xb01ae745b101e9e4,0x5ec05dcff72e7f8f,
0xdc21a1171d42645d,0x76707543f4fa1f73,
0x899504ae72497eba,0x6a06494a791c53a8,
0xabfa45da0edbde69,0x487db9d17636892,
0xd6f8d7509292d603,0x45a9d2845d3c42b6,
0x865b86925b9bc5c2,0xb8a2392ba45a9b2,
0xa7f26836f282b732,0x8e6cac7768d7141e,
0xd1ef0244af2364ff,0x3207d795430cd926,
0x8335616aed761f1f,0x7f44e6bd49e807b8,
0xa402b9c5a8d3a6e7,0x5f16206c9c6209a6,
0xcd036837130890a1,0x36dba887c37a8c0f,
0x802221226be55a64,0xc2494954da2c9789,
0xa02aa96b06deb0fd,0xf2db9baa10b7bd6c,
0xc83553c5c8965d3d,0x6f92829494e5acc7,
0xfa42a8b73abbf48c,0xcb772339ba1f17f9,
0x9c69a97284b578d7,0xff2a760414536efb,
0xc38413cf25e2d70d,0xfef5138519684aba,
0xf46518c2ef5b8cd1,0x7eb258665fc25d69,
0x98bf2f79d5993802,0xef2f773ffbd97a61,
0xbeeefb584aff8603,0xaafb550ffacfd8fa,
0xeeaaba2e5dbf6784,0x95ba2a53f983cf38,
0x952ab45cfa97a0b2,0xdd945a747bf26183,
0xba756174393d88df,0x94f971119aeef9e4,
0xe912b9d1478ceb17,0x7a37cd5601aab85d,
0x91abb422ccb812ee,0xac62e055c10ab33a,
0xb616a12b7fe617aa,0x577b986b314d6009,
0xe39c49765fdf9d94,0xed5a7e85fda0b80b,
0x8e41ade9fbebc27d,0x14588f13be847307,
0xb1d219647ae6b31c,0x596eb2d8ae258fc8,
0xde469fbd99a05fe3,0x6fca5f8ed9aef3bb,
0x8aec23d680043bee,0x25de7bb9480d5854,
0xada72ccc20054ae9,0xaf561aa79a10ae6a,
0xd910f7ff28069da4,0x1b2ba1518094da04,
0x87aa9aff79042286,0x90fb44d2f05d0842,
0xa99541bf57452b28,0x353a1607ac744a53,
0xd3fa922f2d1675f2,0x42889b8997915ce8,
0x847c9b5d7c2e09b7,0x69956135febada11,
0xa59bc234db398c25,0x43fab9837e699095,
0xcf02b2c21207ef2e,0x94f967e45e03f4bb,
0x8161afb94b44f57d,0x1d1be0eebac278f5,
0xa1ba1ba79e1632dc,0x6462d92a69731732,
0xca28a291859bbf93,0x7d7b8f7503cfdcfe,
0xfcb2cb35e702af78,0x5cda735244c3d43e,
0x9defbf01b061adab,0x3a0888136afa64a7,
0xc56baec21c7a1916,0x88aaa1845b8fdd0,
0xf6c69a72a3989f5b,0x8aad549e57273d45,
0x9a3c2087a63f6399,0x36ac54e2f678864b,
0xc0cb28a98fcf3c7f,0x84576a1bb416a7dd,
0xf0fdf2d3f3c30b9f,0x656d44a2a11c51d5,
0x969eb7c47859e743,0x9f644ae5a4b1b325,
0xbc4665b596706114,0x873d5d9f0dde1fee,
0xeb57ff22fc0c7959,0xa90cb506d155a7ea,
0x9316ff75dd87cbd8,0x9a7f12442d588f2,
0xb7dcbf5354e9bece,0xc11ed6d538aeb2f,
0xe5d3ef282a242e81,0x8f1668c8a86da5fa,
0x8fa475791a569d10,0xf96e017d694487bc,
0xb38d92d760ec4455,0x37c981dcc395a9ac,
0xe070f78d3927556a,0x85bbe253f47b1417,
0x8c469ab843b89562,0x93956d7478ccec8e,
0xaf58416654a6babb,0x387ac8d1970027b2,
0xdb2e51bfe9d0696a,0x6997b05fcc0319e,
0x88fcf317f22241e2,0x441fece3bdf81f03,
0xab3c2fddeeaad25a,0xd527e81cad7626c3,
0xd60b3bd56a5586f1,0x8a71e223d8d3b074,
0x85c7056562757456,0xf6872d5667844e49,
0xa738c6bebb12d16c,0xb428f8ac016561db,
0xd106f86e69d785c7,0xe13336d701beba52,
0x82a45b450226b39c,0xecc0024661173473,
0xa34d721642b06084,0x27f002d7f95d0190,
0xcc20ce9bd35c78a5,0x31ec038df7b441f4,
0xff290242c83396ce,0x7e67047175a15271,
0x9f79a169bd203e41,0xf0062c6e984d386,
0xc75809c42c684dd1,0x52c07b78a3e60868,
0xf92e0c3537826145,0xa7709a56ccdf8a82,
0x9bbcc7a142b17ccb,0x88a66076400bb691,
0xc2abf989935ddbfe,0x6acff893d00ea435,
0xf356f7ebf83552fe,0x583f6b8c4124d43,
0x98165af37b2153de,0xc3727a337a8b704a,
0xbe1bf1b059e9a8d6,0x744f18c0592e4c5c,
0xeda2ee1c7064130c,0x1162def06f79df73,
0x9485d4d1c63e8be7,0x8addcb5645ac2ba8,
0xb9a74a0637ce2ee1,0x6d953e2bd7173692,
0xe8111c87c5c1ba99,0xc8fa8db6ccdd0437,
0x910ab1d4db9914a0,0x1d9c9892400a22a2,
0xb54d5e4a127f59c8,0x2503beb6d00cab4b,
0xe2a0b5dc971f303a,0x2e44ae64840fd61d,
0x8da471a9de737e24,0x5ceaecfed289e5d2,
0xb10d8e1456105dad,0x7425a83e872c5f47,
0xdd50f1996b947518,0xd12f124e28f77719,
0x8a5296ffe33cc92f,0x82bd6b70d99aaa6f,
0xace73cbfdc0bfb7b,0x636cc64d1001550b,
0xd8210befd30efa5a,0x3c47f7e05401aa4e,
0x8714a775e3e95c78,0x65acfaec34810a71,
0xa8d9d1535ce3b396,0x7f1839a741a14d0d,
0xd31045a8341ca07c,0x1ede48111209a050,
0x83ea2b892091e44d,0x934aed0aab460432,
0xa4e4b66b68b65d60,0xf81da84d5617853f,
0xce1de40642e3f4b9,0x36251260ab9d668e,
0x80d2ae83e9ce78f3,0xc1d72b7c6b426019,
0xa1075a24e4421730,0xb24cf65b8612f81f,
0xc94930ae1d529cfc,0xdee033f26797b627,
0xfb9b7cd9a4a7443c,0x169840ef017da3b1,
0x9d412e0806e88aa5,0x8e1f289560ee864e,
0xc491798a08a2ad4e,0xf1a6f2bab92a27e2,
0xf5b5d7ec8acb58a2,0xae10af696774b1db,
0x9991a6f3d6bf1765,0xacca6da1e0a8ef29,
0xbff610b0cc6edd3f,0x17fd090a58d32af3,
0xeff394dcff8a948e,0xddfc4b4cef07f5b0,
0x95f83d0a1fb69cd9,0x4abdaf101564f98e,
0xbb764c4ca7a4440f,0x9d6d1ad41abe37f1,
0xea53df5fd18d5513,0x84c86189216dc5ed,
0x92746b9be2f8552c,0x32fd3cf5b4e49bb4,
0xb7118682dbb66a77,0x3fbc8c33221dc2a1,
0xe4d5e82392a40515,0xfabaf3feaa5334a,
0x8f05b1163ba6832d,0x29cb4d87f2a7400e,
0xb2c71d5bca9023f8,0x743e20e9ef511012,
0xdf78e4b2bd342cf6,0x914da9246b255416,
0x8bab8eefb6409c1a,0x1ad089b6c2f7548e,
0xae9672aba3d0c320,0xa184ac2473b529b1,
0xda3c0f568cc4f3e8,0xc9e5d72d90a2741e,
0x8865899617fb1871,0x7e2fa67c7a658892,
0xaa7eebfb9df9de8d,0xddbb901b98feeab7,
0xd51ea6fa85785631,0x552a74227f3ea565,
0x8533285c936b35de,0xd53a88958f87275f,
0xa67ff273b8460356,0x8a892abaf368f137,
0xd01fef10a657842c,0x2d2b7569b0432d85,
0x8213f56a67f6b29b,0x9c3b29620e29fc73,
0xa298f2c501f45f42,0x8349f3ba91b47b8f,
0xcb3f2f7642717713,0x241c70a936219a73,
0xfe0efb53d30dd4d7,0xed238cd383aa0110,
0x9ec95d1463e8a506,0xf4363804324a40aa,
0xc67bb4597ce2ce48,0xb143c6053edcd0d5,
0xf81aa16fdc1b81da,0xdd94b7868e94050a,
0x9b10a4e5e9913128,0xca7cf2b4191c8326,
0xc1d4ce1f63f57d72,0xfd1c2f611f63a3f0,
0xf24a01a73cf2dccf,0xbc633b39673c8cec,
0x976e41088617ca01,0xd5be0503e085d813,
0xbd49d14aa79dbc82,0x4b2d8644d8a74e18,
0xec9c459d51852ba2,0xddf8e7d60ed1219e,
0x93e1ab8252f33b45,0xcabb90e5c942b503,
0xb8da1662e7b00a17,0x3d6a751f3b936243,
0xe7109bfba19c0c9d,0xcc512670a783ad4,
0x906a617d450187e2,0x27fb2b80668b24c5,
0xb484f9dc9641e9da,0xb1f9f660802dedf6,
0xe1a63853bbd26451,0x5e7873f8a0396973,
0x8d07e33455637eb2,0xdb0b487b6423e1e8,
0xb049dc016abc5e5f,0x91ce1a9a3d2cda62,
0xdc5c5301c56b75f7,0x7641a140cc7810fb,
0x89b9b3e11b6329ba,0xa9e904c87fcb0a9d,
0xac2820d9623bf429,0x546345fa9fbdcd44,
0xd732290fbacaf133,0xa97c177947ad4095,
0x867f59a9d4bed6c0,0x49ed8eabcccc485d,
0xa81f301449ee8c70,0x5c68f256bfff5a74,
0xd226fc195c6a2f8c,0x73832eec6fff3111,
0x83585d8fd9c25db7,0xc831fd53c5ff7eab,
0xa42e74f3d032f525,0xba3e7ca8b77f5e55,
0xcd3a1230c43fb26f,0x28ce1bd2e55f35eb,
0x80444b5e7aa7cf85,0x7980d163cf5b81b3,
0xa0555e361951c366,0xd7e105bcc332621f,
0xc86ab5c39fa63440,0x8dd9472bf3fefaa7,
0xfa856334878fc150,0xb14f98f6f0feb951,
0x9c935e00d4b9d8d2,0x6ed1bf9a569f33d3,
0xc3b8358109e84f07,0xa862f80ec4700c8,
0xf4a642e14c6262c8,0xcd27bb612758c0fa,
0x98e7e9cccfbd7dbd,0x8038d51cb897789c,
0xbf21e44003acdd2c,0xe0470a63e6bd56c3,
0xeeea5d5004981478,0x1858ccfce06cac74,
0x95527a5202df0ccb,0xf37801e0c43ebc8,
0xbaa718e68396cffd,0xd30560258f54e6ba,
0xe950df20247c83fd,0x47c6b82ef32a2069,
0x91d28b7416cdd27e,0x4cdc331d57fa5441,
0xb6472e511c81471d,0xe0133fe4adf8e952,
0xe3d8f9e563a198e5,0x58180fddd97723a6,
0x8e679c2f5e44ff8f,0x570f09eaa7ea7648,};
#endif // SIMDJSON_SRC_NUMBERPARSING_TABLES_CPP
/* end file internal/numberparsing_tables.cpp */
/* including internal/simdprune_tables.cpp: #include <internal/simdprune_tables.cpp> */
/* begin file internal/simdprune_tables.cpp */
#ifndef SIMDJSON_SRC_SIMDPRUNE_TABLES_CPP
#define SIMDJSON_SRC_SIMDPRUNE_TABLES_CPP
/* including simdjson/implementation_detection.h: #include <simdjson/implementation_detection.h> */
/* begin file simdjson/implementation_detection.h */
#ifndef SIMDJSON_IMPLEMENTATION_DETECTION_H
#define SIMDJSON_IMPLEMENTATION_DETECTION_H
/* skipped duplicate #include "simdjson/base.h" */
// 0 is reserved, because undefined SIMDJSON_IMPLEMENTATION equals 0 in preprocessor macros.
#define SIMDJSON_IMPLEMENTATION_ID_arm64 1
#define SIMDJSON_IMPLEMENTATION_ID_fallback 2
#define SIMDJSON_IMPLEMENTATION_ID_haswell 3
#define SIMDJSON_IMPLEMENTATION_ID_icelake 4
#define SIMDJSON_IMPLEMENTATION_ID_ppc64 5
#define SIMDJSON_IMPLEMENTATION_ID_westmere 6
#define SIMDJSON_IMPLEMENTATION_ID_FOR(IMPL) SIMDJSON_CAT(SIMDJSON_IMPLEMENTATION_ID_, IMPL)
#define SIMDJSON_IMPLEMENTATION_ID SIMDJSON_IMPLEMENTATION_ID_FOR(SIMDJSON_IMPLEMENTATION)
#define SIMDJSON_IMPLEMENTATION_IS(IMPL) SIMDJSON_IMPLEMENTATION_ID == SIMDJSON_IMPLEMENTATION_ID_FOR(IMPL)
//
// First, figure out which implementations can be run. Doing it here makes it so we don't have to worry about the order
// in which we include them.
//
#ifndef SIMDJSON_IMPLEMENTATION_ARM64
#define SIMDJSON_IMPLEMENTATION_ARM64 (SIMDJSON_IS_ARM64)
#endif
#define SIMDJSON_CAN_ALWAYS_RUN_ARM64 SIMDJSON_IMPLEMENTATION_ARM64 && SIMDJSON_IS_ARM64
// Default Icelake to on if this is x86-64. Even if we're not compiled for it, it could be selected
// at runtime.
#ifndef SIMDJSON_IMPLEMENTATION_ICELAKE
#define SIMDJSON_IMPLEMENTATION_ICELAKE ((SIMDJSON_IS_X86_64) && (SIMDJSON_AVX512_ALLOWED) && (SIMDJSON_COMPILER_SUPPORTS_VBMI2))
#endif
#ifdef _MSC_VER
// To see why (__BMI__) && (__PCLMUL__) && (__LZCNT__) are not part of this next line, see
// https://github.com/simdjson/simdjson/issues/1247
#define SIMDJSON_CAN_ALWAYS_RUN_ICELAKE ((SIMDJSON_IMPLEMENTATION_ICELAKE) && (__AVX2__) && (__AVX512F__) && (__AVX512DQ__) && (__AVX512CD__) && (__AVX512BW__) && (__AVX512VL__) && (__AVX512VBMI2__))
#else
#define SIMDJSON_CAN_ALWAYS_RUN_ICELAKE ((SIMDJSON_IMPLEMENTATION_ICELAKE) && (__AVX2__) && (__BMI__) && (__PCLMUL__) && (__LZCNT__) && (__AVX512F__) && (__AVX512DQ__) && (__AVX512CD__) && (__AVX512BW__) && (__AVX512VL__) && (__AVX512VBMI2__))
#endif
// Default Haswell to on if this is x86-64. Even if we're not compiled for it, it could be selected
// at runtime.
#ifndef SIMDJSON_IMPLEMENTATION_HASWELL
#if SIMDJSON_CAN_ALWAYS_RUN_ICELAKE
// if icelake is always available, never enable haswell.
#define SIMDJSON_IMPLEMENTATION_HASWELL 0
#else
#define SIMDJSON_IMPLEMENTATION_HASWELL SIMDJSON_IS_X86_64
#endif
#endif
#ifdef _MSC_VER
// To see why (__BMI__) && (__PCLMUL__) && (__LZCNT__) are not part of this next line, see
// https://github.com/simdjson/simdjson/issues/1247
#define SIMDJSON_CAN_ALWAYS_RUN_HASWELL ((SIMDJSON_IMPLEMENTATION_HASWELL) && (SIMDJSON_IS_X86_64) && (__AVX2__))
#else
#define SIMDJSON_CAN_ALWAYS_RUN_HASWELL ((SIMDJSON_IMPLEMENTATION_HASWELL) && (SIMDJSON_IS_X86_64) && (__AVX2__) && (__BMI__) && (__PCLMUL__) && (__LZCNT__))
#endif
// Default Westmere to on if this is x86-64.
#ifndef SIMDJSON_IMPLEMENTATION_WESTMERE
#if SIMDJSON_CAN_ALWAYS_RUN_ICELAKE || SIMDJSON_CAN_ALWAYS_RUN_HASWELL
// if icelake or haswell are always available, never enable westmere.
#define SIMDJSON_IMPLEMENTATION_WESTMERE 0
#else
#define SIMDJSON_IMPLEMENTATION_WESTMERE SIMDJSON_IS_X86_64
#endif
#endif
#define SIMDJSON_CAN_ALWAYS_RUN_WESTMERE (SIMDJSON_IMPLEMENTATION_WESTMERE && SIMDJSON_IS_X86_64 && __SSE4_2__ && __PCLMUL__)
#ifndef SIMDJSON_IMPLEMENTATION_PPC64
#define SIMDJSON_IMPLEMENTATION_PPC64 (SIMDJSON_IS_PPC64 && SIMDJSON_IS_PPC64_VMX)
#endif
#define SIMDJSON_CAN_ALWAYS_RUN_PPC64 SIMDJSON_IMPLEMENTATION_PPC64 && SIMDJSON_IS_PPC64 && SIMDJSON_IS_PPC64_VMX
// Default Fallback to on unless a builtin implementation has already been selected.
#ifndef SIMDJSON_IMPLEMENTATION_FALLBACK
#if SIMDJSON_CAN_ALWAYS_RUN_ARM64 || SIMDJSON_CAN_ALWAYS_RUN_ICELAKE || SIMDJSON_CAN_ALWAYS_RUN_HASWELL || SIMDJSON_CAN_ALWAYS_RUN_WESTMERE || SIMDJSON_CAN_ALWAYS_RUN_PPC64
// if anything at all except fallback can always run, then disable fallback.
#define SIMDJSON_IMPLEMENTATION_FALLBACK 0
#else
#define SIMDJSON_IMPLEMENTATION_FALLBACK 1
#endif
#endif
#define SIMDJSON_CAN_ALWAYS_RUN_FALLBACK SIMDJSON_IMPLEMENTATION_FALLBACK
// Determine the best builtin implementation
#ifndef SIMDJSON_BUILTIN_IMPLEMENTATION
#if SIMDJSON_CAN_ALWAYS_RUN_ICELAKE
#define SIMDJSON_BUILTIN_IMPLEMENTATION icelake
#elif SIMDJSON_CAN_ALWAYS_RUN_HASWELL
#define SIMDJSON_BUILTIN_IMPLEMENTATION haswell
#elif SIMDJSON_CAN_ALWAYS_RUN_WESTMERE
#define SIMDJSON_BUILTIN_IMPLEMENTATION westmere
#elif SIMDJSON_CAN_ALWAYS_RUN_ARM64
#define SIMDJSON_BUILTIN_IMPLEMENTATION arm64
#elif SIMDJSON_CAN_ALWAYS_RUN_PPC64
#define SIMDJSON_BUILTIN_IMPLEMENTATION ppc64
#elif SIMDJSON_CAN_ALWAYS_RUN_FALLBACK
#define SIMDJSON_BUILTIN_IMPLEMENTATION fallback
#else
#error "All possible implementations (including fallback) have been disabled! simdjson will not run."
#endif
#endif // SIMDJSON_BUILTIN_IMPLEMENTATION
#define SIMDJSON_BUILTIN_IMPLEMENTATION_ID SIMDJSON_IMPLEMENTATION_ID_FOR(SIMDJSON_BUILTIN_IMPLEMENTATION)
#define SIMDJSON_BUILTIN_IMPLEMENTATION_IS(IMPL) SIMDJSON_BUILTIN_IMPLEMENTATION_ID == SIMDJSON_IMPLEMENTATION_ID_FOR(IMPL)
#endif // SIMDJSON_IMPLEMENTATION_DETECTION_H
/* end file simdjson/implementation_detection.h */
#if SIMDJSON_IMPLEMENTATION_ARM64 || SIMDJSON_IMPLEMENTATION_ICELAKE || SIMDJSON_IMPLEMENTATION_HASWELL || SIMDJSON_IMPLEMENTATION_WESTMERE || SIMDJSON_IMPLEMENTATION_PPC64
#include <cstdint>
namespace simdjson { // table modified and copied from
namespace internal { // http://graphics.stanford.edu/~seander/bithacks.html#CountBitsSetTable
SIMDJSON_DLLIMPORTEXPORT const unsigned char BitsSetTable256mul2[256] = {
0, 2, 2, 4, 2, 4, 4, 6, 2, 4, 4, 6, 4, 6, 6, 8, 2, 4, 4,
6, 4, 6, 6, 8, 4, 6, 6, 8, 6, 8, 8, 10, 2, 4, 4, 6, 4, 6,
6, 8, 4, 6, 6, 8, 6, 8, 8, 10, 4, 6, 6, 8, 6, 8, 8, 10, 6,
8, 8, 10, 8, 10, 10, 12, 2, 4, 4, 6, 4, 6, 6, 8, 4, 6, 6, 8,
6, 8, 8, 10, 4, 6, 6, 8, 6, 8, 8, 10, 6, 8, 8, 10, 8, 10, 10,
12, 4, 6, 6, 8, 6, 8, 8, 10, 6, 8, 8, 10, 8, 10, 10, 12, 6, 8,
8, 10, 8, 10, 10, 12, 8, 10, 10, 12, 10, 12, 12, 14, 2, 4, 4, 6, 4,
6, 6, 8, 4, 6, 6, 8, 6, 8, 8, 10, 4, 6, 6, 8, 6, 8, 8, 10,
6, 8, 8, 10, 8, 10, 10, 12, 4, 6, 6, 8, 6, 8, 8, 10, 6, 8, 8,
10, 8, 10, 10, 12, 6, 8, 8, 10, 8, 10, 10, 12, 8, 10, 10, 12, 10, 12,
12, 14, 4, 6, 6, 8, 6, 8, 8, 10, 6, 8, 8, 10, 8, 10, 10, 12, 6,
8, 8, 10, 8, 10, 10, 12, 8, 10, 10, 12, 10, 12, 12, 14, 6, 8, 8, 10,
8, 10, 10, 12, 8, 10, 10, 12, 10, 12, 12, 14, 8, 10, 10, 12, 10, 12, 12,
14, 10, 12, 12, 14, 12, 14, 14, 16};
SIMDJSON_DLLIMPORTEXPORT const uint8_t pshufb_combine_table[272] = {
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b,
0x0c, 0x0d, 0x0e, 0x0f, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x08,
0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0xff, 0x00, 0x01, 0x02, 0x03,
0x04, 0x05, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0xff, 0xff,
0x00, 0x01, 0x02, 0x03, 0x04, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e,
0x0f, 0xff, 0xff, 0xff, 0x00, 0x01, 0x02, 0x03, 0x08, 0x09, 0x0a, 0x0b,
0x0c, 0x0d, 0x0e, 0x0f, 0xff, 0xff, 0xff, 0xff, 0x00, 0x01, 0x02, 0x08,
0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0xff, 0xff, 0xff, 0xff, 0xff,
0x00, 0x01, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0x00, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e,
0x0f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x08, 0x09, 0x0a, 0x0b,
0x0c, 0x0d, 0x0e, 0x0f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
};
// 256 * 8 bytes = 2kB, easily fits in cache.
SIMDJSON_DLLIMPORTEXPORT const uint64_t thintable_epi8[256] = {
0x0706050403020100, 0x0007060504030201, 0x0007060504030200,
0x0000070605040302, 0x0007060504030100, 0x0000070605040301,
0x0000070605040300, 0x0000000706050403, 0x0007060504020100,
0x0000070605040201, 0x0000070605040200, 0x0000000706050402,
0x0000070605040100, 0x0000000706050401, 0x0000000706050400,
0x0000000007060504, 0x0007060503020100, 0x0000070605030201,
0x0000070605030200, 0x0000000706050302, 0x0000070605030100,
0x0000000706050301, 0x0000000706050300, 0x0000000007060503,
0x0000070605020100, 0x0000000706050201, 0x0000000706050200,
0x0000000007060502, 0x0000000706050100, 0x0000000007060501,
0x0000000007060500, 0x0000000000070605, 0x0007060403020100,
0x0000070604030201, 0x0000070604030200, 0x0000000706040302,
0x0000070604030100, 0x0000000706040301, 0x0000000706040300,
0x0000000007060403, 0x0000070604020100, 0x0000000706040201,
0x0000000706040200, 0x0000000007060402, 0x0000000706040100,
0x0000000007060401, 0x0000000007060400, 0x0000000000070604,
0x0000070603020100, 0x0000000706030201, 0x0000000706030200,
0x0000000007060302, 0x0000000706030100, 0x0000000007060301,
0x0000000007060300, 0x0000000000070603, 0x0000000706020100,
0x0000000007060201, 0x0000000007060200, 0x0000000000070602,
0x0000000007060100, 0x0000000000070601, 0x0000000000070600,
0x0000000000000706, 0x0007050403020100, 0x0000070504030201,
0x0000070504030200, 0x0000000705040302, 0x0000070504030100,
0x0000000705040301, 0x0000000705040300, 0x0000000007050403,
0x0000070504020100, 0x0000000705040201, 0x0000000705040200,
0x0000000007050402, 0x0000000705040100, 0x0000000007050401,
0x0000000007050400, 0x0000000000070504, 0x0000070503020100,
0x0000000705030201, 0x0000000705030200, 0x0000000007050302,
0x0000000705030100, 0x0000000007050301, 0x0000000007050300,
0x0000000000070503, 0x0000000705020100, 0x0000000007050201,
0x0000000007050200, 0x0000000000070502, 0x0000000007050100,
0x0000000000070501, 0x0000000000070500, 0x0000000000000705,
0x0000070403020100, 0x0000000704030201, 0x0000000704030200,
0x0000000007040302, 0x0000000704030100, 0x0000000007040301,
0x0000000007040300, 0x0000000000070403, 0x0000000704020100,
0x0000000007040201, 0x0000000007040200, 0x0000000000070402,
0x0000000007040100, 0x0000000000070401, 0x0000000000070400,
0x0000000000000704, 0x0000000703020100, 0x0000000007030201,
0x0000000007030200, 0x0000000000070302, 0x0000000007030100,
0x0000000000070301, 0x0000000000070300, 0x0000000000000703,
0x0000000007020100, 0x0000000000070201, 0x0000000000070200,
0x0000000000000702, 0x0000000000070100, 0x0000000000000701,
0x0000000000000700, 0x0000000000000007, 0x0006050403020100,
0x0000060504030201, 0x0000060504030200, 0x0000000605040302,
0x0000060504030100, 0x0000000605040301, 0x0000000605040300,
0x0000000006050403, 0x0000060504020100, 0x0000000605040201,
0x0000000605040200, 0x0000000006050402, 0x0000000605040100,
0x0000000006050401, 0x0000000006050400, 0x0000000000060504,
0x0000060503020100, 0x0000000605030201, 0x0000000605030200,
0x0000000006050302, 0x0000000605030100, 0x0000000006050301,
0x0000000006050300, 0x0000000000060503, 0x0000000605020100,
0x0000000006050201, 0x0000000006050200, 0x0000000000060502,
0x0000000006050100, 0x0000000000060501, 0x0000000000060500,
0x0000000000000605, 0x0000060403020100, 0x0000000604030201,
0x0000000604030200, 0x0000000006040302, 0x0000000604030100,
0x0000000006040301, 0x0000000006040300, 0x0000000000060403,
0x0000000604020100, 0x0000000006040201, 0x0000000006040200,
0x0000000000060402, 0x0000000006040100, 0x0000000000060401,
0x0000000000060400, 0x0000000000000604, 0x0000000603020100,
0x0000000006030201, 0x0000000006030200, 0x0000000000060302,
0x0000000006030100, 0x0000000000060301, 0x0000000000060300,
0x0000000000000603, 0x0000000006020100, 0x0000000000060201,
0x0000000000060200, 0x0000000000000602, 0x0000000000060100,
0x0000000000000601, 0x0000000000000600, 0x0000000000000006,
0x0000050403020100, 0x0000000504030201, 0x0000000504030200,
0x0000000005040302, 0x0000000504030100, 0x0000000005040301,
0x0000000005040300, 0x0000000000050403, 0x0000000504020100,
0x0000000005040201, 0x0000000005040200, 0x0000000000050402,
0x0000000005040100, 0x0000000000050401, 0x0000000000050400,
0x0000000000000504, 0x0000000503020100, 0x0000000005030201,
0x0000000005030200, 0x0000000000050302, 0x0000000005030100,
0x0000000000050301, 0x0000000000050300, 0x0000000000000503,
0x0000000005020100, 0x0000000000050201, 0x0000000000050200,
0x0000000000000502, 0x0000000000050100, 0x0000000000000501,
0x0000000000000500, 0x0000000000000005, 0x0000000403020100,
0x0000000004030201, 0x0000000004030200, 0x0000000000040302,
0x0000000004030100, 0x0000000000040301, 0x0000000000040300,
0x0000000000000403, 0x0000000004020100, 0x0000000000040201,
0x0000000000040200, 0x0000000000000402, 0x0000000000040100,
0x0000000000000401, 0x0000000000000400, 0x0000000000000004,
0x0000000003020100, 0x0000000000030201, 0x0000000000030200,
0x0000000000000302, 0x0000000000030100, 0x0000000000000301,
0x0000000000000300, 0x0000000000000003, 0x0000000000020100,
0x0000000000000201, 0x0000000000000200, 0x0000000000000002,
0x0000000000000100, 0x0000000000000001, 0x0000000000000000,
0x0000000000000000,
}; //static uint64_t thintable_epi8[256]
} // namespace internal
} // namespace simdjson
#endif // SIMDJSON_IMPLEMENTATION_ARM64 || SIMDJSON_IMPLEMENTATION_ICELAKE || SIMDJSON_IMPLEMENTATION_HASWELL || SIMDJSON_IMPLEMENTATION_WESTMERE || SIMDJSON_IMPLEMENTATION_PPC64
#endif // SIMDJSON_SRC_SIMDPRUNE_TABLES_CPP
/* end file internal/simdprune_tables.cpp */
/* including simdjson/generic/dependencies.h: #include <simdjson/generic/dependencies.h> */
/* begin file simdjson/generic/dependencies.h */
#ifdef SIMDJSON_CONDITIONAL_INCLUDE
#error simdjson/generic/dependencies.h must be included before defining SIMDJSON_CONDITIONAL_INCLUDE!
#endif
#ifndef SIMDJSON_GENERIC_DEPENDENCIES_H
#define SIMDJSON_GENERIC_DEPENDENCIES_H
// Internal headers needed for generics.
// All includes referencing simdjson headers *not* under simdjson/generic must be here!
// Otherwise, amalgamation will fail.
/* skipped duplicate #include "simdjson/base.h" */
/* including simdjson/implementation.h: #include "simdjson/implementation.h" */
/* begin file simdjson/implementation.h */
#ifndef SIMDJSON_IMPLEMENTATION_H
#define SIMDJSON_IMPLEMENTATION_H
/* including simdjson/internal/atomic_ptr.h: #include "simdjson/internal/atomic_ptr.h" */
/* begin file simdjson/internal/atomic_ptr.h */
#ifndef SIMDJSON_INTERNAL_ATOMIC_PTR_H
#define SIMDJSON_INTERNAL_ATOMIC_PTR_H
/* skipped duplicate #include "simdjson/base.h" */
#include <atomic>
namespace simdjson {
namespace internal {
template<typename T>
class atomic_ptr {
public:
atomic_ptr(T *_ptr) : ptr{_ptr} {}
operator const T*() const { return ptr.load(); }
const T& operator*() const { return *ptr; }
const T* operator->() const { return ptr.load(); }
operator T*() { return ptr.load(); }
T& operator*() { return *ptr; }
T* operator->() { return ptr.load(); }
atomic_ptr& operator=(T *_ptr) { ptr = _ptr; return *this; }
private:
std::atomic<T*> ptr;
};
} // namespace internal
} // namespace simdjson
#endif // SIMDJSON_INTERNAL_ATOMIC_PTR_H
/* end file simdjson/internal/atomic_ptr.h */
/* including simdjson/internal/dom_parser_implementation.h: #include "simdjson/internal/dom_parser_implementation.h" */
/* begin file simdjson/internal/dom_parser_implementation.h */
#ifndef SIMDJSON_INTERNAL_DOM_PARSER_IMPLEMENTATION_H
#define SIMDJSON_INTERNAL_DOM_PARSER_IMPLEMENTATION_H
/* skipped duplicate #include "simdjson/base.h" */
/* skipped duplicate #include "simdjson/error.h" */
#include <memory>
namespace simdjson {
namespace dom {
class document;
} // namespace dom
/**
* This enum is used with the dom_parser_implementation::stage1 function.
* 1) The regular mode expects a fully formed JSON document.
* 2) The streaming_partial mode expects a possibly truncated
* input within a stream on JSON documents.
* 3) The stream_final mode allows us to truncate final
* unterminated strings. It is useful in conjunction with streaming_partial.
*/
enum class stage1_mode { regular, streaming_partial, streaming_final};
/**
* Returns true if mode == streaming_partial or mode == streaming_final
*/
inline bool is_streaming(stage1_mode mode) {
// performance note: it is probably faster to check that mode is different
// from regular than checking that it is either streaming_partial or streaming_final.
return (mode != stage1_mode::regular);
// return (mode == stage1_mode::streaming_partial || mode == stage1_mode::streaming_final);
}
namespace internal {
/**
* An implementation of simdjson's DOM parser for a particular CPU architecture.
*
* This class is expected to be accessed only by pointer, and never move in memory (though the
* pointer can move).
*/
class dom_parser_implementation {
public:
/**
* @private For internal implementation use
*
* Run a full JSON parse on a single document (stage1 + stage2).
*
* Guaranteed only to be called when capacity > document length.
*
* Overridden by each implementation.
*
* @param buf The json document to parse. *MUST* be allocated up to len + SIMDJSON_PADDING bytes.
* @param len The length of the json document.
* @return The error code, or SUCCESS if there was no error.
*/
simdjson_warn_unused virtual error_code parse(const uint8_t *buf, size_t len, dom::document &doc) noexcept = 0;
/**
* @private For internal implementation use
*
* Stage 1 of the document parser.
*
* Guaranteed only to be called when capacity > document length.
*
* Overridden by each implementation.
*
* @param buf The json document to parse.
* @param len The length of the json document.
* @param streaming Whether this is being called by parser::parse_many.
* @return The error code, or SUCCESS if there was no error.
*/
simdjson_warn_unused virtual error_code stage1(const uint8_t *buf, size_t len, stage1_mode streaming) noexcept = 0;
/**
* @private For internal implementation use
*
* Stage 2 of the document parser.
*
* Called after stage1().
*
* Overridden by each implementation.
*
* @param doc The document to output to.
* @return The error code, or SUCCESS if there was no error.
*/
simdjson_warn_unused virtual error_code stage2(dom::document &doc) noexcept = 0;
/**
* @private For internal implementation use
*
* Stage 2 of the document parser for parser::parse_many.
*
* Guaranteed only to be called after stage1().
* Overridden by each implementation.
*
* @param doc The document to output to.
* @return The error code, SUCCESS if there was no error, or EMPTY if all documents have been parsed.
*/
simdjson_warn_unused virtual error_code stage2_next(dom::document &doc) noexcept = 0;
/**
* Unescape a valid UTF-8 string from src to dst, stopping at a final unescaped quote. There
* must be an unescaped quote terminating the string. It returns the final output
* position as pointer. In case of error (e.g., the string has bad escaped codes),
* then null_nullptrptr is returned. It is assumed that the output buffer is large
* enough. E.g., if src points at 'joe"', then dst needs to have four free bytes +
* SIMDJSON_PADDING bytes.
*
* Overridden by each implementation.
*
* @param str pointer to the beginning of a valid UTF-8 JSON string, must end with an unescaped quote.
* @param dst pointer to a destination buffer, it must point a region in memory of sufficient size.
* @param allow_replacement whether we allow a replacement character when the UTF-8 contains unmatched surrogate pairs.
* @return end of the of the written region (exclusive) or nullptr in case of error.
*/
simdjson_warn_unused virtual uint8_t *parse_string(const uint8_t *src, uint8_t *dst, bool allow_replacement) const noexcept = 0;
/**
* Unescape a NON-valid UTF-8 string from src to dst, stopping at a final unescaped quote. There
* must be an unescaped quote terminating the string. It returns the final output
* position as pointer. In case of error (e.g., the string has bad escaped codes),
* then null_nullptrptr is returned. It is assumed that the output buffer is large
* enough. E.g., if src points at 'joe"', then dst needs to have four free bytes +
* SIMDJSON_PADDING bytes.
*
* Overridden by each implementation.
*
* @param str pointer to the beginning of a possibly invalid UTF-8 JSON string, must end with an unescaped quote.
* @param dst pointer to a destination buffer, it must point a region in memory of sufficient size.
* @return end of the of the written region (exclusive) or nullptr in case of error.
*/
simdjson_warn_unused virtual uint8_t *parse_wobbly_string(const uint8_t *src, uint8_t *dst) const noexcept = 0;
/**
* Change the capacity of this parser.
*
* The capacity can never exceed SIMDJSON_MAXSIZE_BYTES (e.g., 4 GB)
* and an CAPACITY error is returned if it is attempted.
*
* Generally used for reallocation.
*
* @param capacity The new capacity.
* @param max_depth The new max_depth.
* @return The error code, or SUCCESS if there was no error.
*/
virtual error_code set_capacity(size_t capacity) noexcept = 0;
/**
* Change the max depth of this parser.
*
* Generally used for reallocation.
*
* @param capacity The new capacity.
* @param max_depth The new max_depth.
* @return The error code, or SUCCESS if there was no error.
*/
virtual error_code set_max_depth(size_t max_depth) noexcept = 0;
/**
* Deallocate this parser.
*/
virtual ~dom_parser_implementation() = default;
/** Number of structural indices passed from stage 1 to stage 2 */
uint32_t n_structural_indexes{0};
/** Structural indices passed from stage 1 to stage 2 */
std::unique_ptr<uint32_t[]> structural_indexes{};
/** Next structural index to parse */
uint32_t next_structural_index{0};
/**
* The largest document this parser can support without reallocating.
*
* @return Current capacity, in bytes.
*/
simdjson_inline size_t capacity() const noexcept;
/**
* The maximum level of nested object and arrays supported by this parser.
*
* @return Maximum depth, in bytes.
*/
simdjson_inline size_t max_depth() const noexcept;
/**
* Ensure this parser has enough memory to process JSON documents up to `capacity` bytes in length
* and `max_depth` depth.
*
* @param capacity The new capacity.
* @param max_depth The new max_depth. Defaults to DEFAULT_MAX_DEPTH.
* @return The error, if there is one.
*/
simdjson_warn_unused inline error_code allocate(size_t capacity, size_t max_depth) noexcept;
protected:
/**
* The maximum document length this parser supports.
*
* Buffers are large enough to handle any document up to this length.
*/
size_t _capacity{0};
/**
* The maximum depth (number of nested objects and arrays) supported by this parser.
*
* Defaults to DEFAULT_MAX_DEPTH.
*/
size_t _max_depth{0};
// Declaring these so that subclasses can use them to implement their constructors.
simdjson_inline dom_parser_implementation() noexcept;
simdjson_inline dom_parser_implementation(dom_parser_implementation &&other) noexcept;
simdjson_inline dom_parser_implementation &operator=(dom_parser_implementation &&other) noexcept;
simdjson_inline dom_parser_implementation(const dom_parser_implementation &) noexcept = delete;
simdjson_inline dom_parser_implementation &operator=(const dom_parser_implementation &other) noexcept = delete;
}; // class dom_parser_implementation
simdjson_inline dom_parser_implementation::dom_parser_implementation() noexcept = default;
simdjson_inline dom_parser_implementation::dom_parser_implementation(dom_parser_implementation &&other) noexcept = default;
simdjson_inline dom_parser_implementation &dom_parser_implementation::operator=(dom_parser_implementation &&other) noexcept = default;
simdjson_inline size_t dom_parser_implementation::capacity() const noexcept {
return _capacity;
}
simdjson_inline size_t dom_parser_implementation::max_depth() const noexcept {
return _max_depth;
}
simdjson_warn_unused
inline error_code dom_parser_implementation::allocate(size_t capacity, size_t max_depth) noexcept {
if (this->max_depth() != max_depth) {
error_code err = set_max_depth(max_depth);
if (err) { return err; }
}
if (_capacity != capacity) {
error_code err = set_capacity(capacity);
if (err) { return err; }
}
return SUCCESS;
}
} // namespace internal
} // namespace simdjson
#endif // SIMDJSON_INTERNAL_DOM_PARSER_IMPLEMENTATION_H
/* end file simdjson/internal/dom_parser_implementation.h */
#include <memory>
namespace simdjson {
/**
* Validate the UTF-8 string.
*
* @param buf the string to validate.
* @param len the length of the string in bytes.
* @return true if the string is valid UTF-8.
*/
simdjson_warn_unused bool validate_utf8(const char * buf, size_t len) noexcept;
/**
* Validate the UTF-8 string.
*
* @param sv the string_view to validate.
* @return true if the string is valid UTF-8.
*/
simdjson_inline simdjson_warn_unused bool validate_utf8(const std::string_view sv) noexcept {
return validate_utf8(sv.data(), sv.size());
}
/**
* Validate the UTF-8 string.
*
* @param p the string to validate.
* @return true if the string is valid UTF-8.
*/
simdjson_inline simdjson_warn_unused bool validate_utf8(const std::string& s) noexcept {
return validate_utf8(s.data(), s.size());
}
/**
* An implementation of simdjson for a particular CPU architecture.
*
* Also used to maintain the currently active implementation. The active implementation is
* automatically initialized on first use to the most advanced implementation supported by the host.
*/
class implementation {
public:
/**
* The name of this implementation.
*
* const implementation *impl = simdjson::get_active_implementation();
* cout << "simdjson is optimized for " << impl->name() << "(" << impl->description() << ")" << endl;
*
* @return the name of the implementation, e.g. "haswell", "westmere", "arm64".
*/
virtual const std::string &name() const { return _name; }
/**
* The description of this implementation.
*
* const implementation *impl = simdjson::get_active_implementation();
* cout << "simdjson is optimized for " << impl->name() << "(" << impl->description() << ")" << endl;
*
* @return the description of the implementation, e.g. "Intel/AMD AVX2", "Intel/AMD SSE4.2", "ARM NEON".
*/
virtual const std::string &description() const { return _description; }
/**
* The instruction sets this implementation is compiled against
* and the current CPU match. This function may poll the current CPU/system
* and should therefore not be called too often if performance is a concern.
*
* @return true if the implementation can be safely used on the current system (determined at runtime).
*/
bool supported_by_runtime_system() const;
/**
* @private For internal implementation use
*
* The instruction sets this implementation is compiled against.
*
* @return a mask of all required `internal::instruction_set::` values.
*/
virtual uint32_t required_instruction_sets() const { return _required_instruction_sets; }
/**
* @private For internal implementation use
*
* const implementation *impl = simdjson::get_active_implementation();
* cout << "simdjson is optimized for " << impl->name() << "(" << impl->description() << ")" << endl;
*
* @param capacity The largest document that will be passed to the parser.
* @param max_depth The maximum JSON object/array nesting this parser is expected to handle.
* @param dst The place to put the resulting parser implementation.
* @return the error code, or SUCCESS if there was no error.
*/
virtual error_code create_dom_parser_implementation(
size_t capacity,
size_t max_depth,
std::unique_ptr<internal::dom_parser_implementation> &dst
) const noexcept = 0;
/**
* @private For internal implementation use
*
* Minify the input string assuming that it represents a JSON string, does not parse or validate.
*
* Overridden by each implementation.
*
* @param buf the json document to minify.
* @param len the length of the json document.
* @param dst the buffer to write the minified document to. *MUST* be allocated up to len + SIMDJSON_PADDING bytes.
* @param dst_len the number of bytes written. Output only.
* @return the error code, or SUCCESS if there was no error.
*/
simdjson_warn_unused virtual error_code minify(const uint8_t *buf, size_t len, uint8_t *dst, size_t &dst_len) const noexcept = 0;
/**
* Validate the UTF-8 string.
*
* Overridden by each implementation.
*
* @param buf the string to validate.
* @param len the length of the string in bytes.
* @return true if and only if the string is valid UTF-8.
*/
simdjson_warn_unused virtual bool validate_utf8(const char *buf, size_t len) const noexcept = 0;
protected:
/** @private Construct an implementation with the given name and description. For subclasses. */
simdjson_inline implementation(
std::string_view name,
std::string_view description,
uint32_t required_instruction_sets
) :
_name(name),
_description(description),
_required_instruction_sets(required_instruction_sets)
{
}
virtual ~implementation()=default;
private:
/**
* The name of this implementation.
*/
const std::string _name;
/**
* The description of this implementation.
*/
const std::string _description;
/**
* Instruction sets required for this implementation.
*/
const uint32_t _required_instruction_sets;
};
/** @private */
namespace internal {
/**
* The list of available implementations compiled into simdjson.
*/
class available_implementation_list {
public:
/** Get the list of available implementations compiled into simdjson */
simdjson_inline available_implementation_list() {}
/** Number of implementations */
size_t size() const noexcept;
/** STL const begin() iterator */
const implementation * const *begin() const noexcept;
/** STL const end() iterator */
const implementation * const *end() const noexcept;
/**
* Get the implementation with the given name.
*
* Case sensitive.
*
* const implementation *impl = simdjson::get_available_implementations()["westmere"];
* if (!impl) { exit(1); }
* if (!imp->supported_by_runtime_system()) { exit(1); }
* simdjson::get_active_implementation() = impl;
*
* @param name the implementation to find, e.g. "westmere", "haswell", "arm64"
* @return the implementation, or nullptr if the parse failed.
*/
const implementation * operator[](const std::string_view &name) const noexcept {
for (const implementation * impl : *this) {
if (impl->name() == name) { return impl; }
}
return nullptr;
}
/**
* Detect the most advanced implementation supported by the current host.
*
* This is used to initialize the implementation on startup.
*
* const implementation *impl = simdjson::available_implementation::detect_best_supported();
* simdjson::get_active_implementation() = impl;
*
* @return the most advanced supported implementation for the current host, or an
* implementation that returns UNSUPPORTED_ARCHITECTURE if there is no supported
* implementation. Will never return nullptr.
*/
const implementation *detect_best_supported() const noexcept;
};
} // namespace internal
/**
* The list of available implementations compiled into simdjson.
*/
extern SIMDJSON_DLLIMPORTEXPORT const internal::available_implementation_list& get_available_implementations();
/**
* The active implementation.
*
* Automatically initialized on first use to the most advanced implementation supported by this hardware.
*/
extern SIMDJSON_DLLIMPORTEXPORT internal::atomic_ptr<const implementation>& get_active_implementation();
} // namespace simdjson
#endif // SIMDJSON_IMPLEMENTATION_H
/* end file simdjson/implementation.h */
/* skipped duplicate #include "simdjson/implementation_detection.h" */
/* including simdjson/internal/instruction_set.h: #include "simdjson/internal/instruction_set.h" */
/* begin file simdjson/internal/instruction_set.h */
/* From
https://github.com/endorno/pytorch/blob/master/torch/lib/TH/generic/simd/simd.h
Highly modified.
Copyright (c) 2016- Facebook, Inc (Adam Paszke)
Copyright (c) 2014- Facebook, Inc (Soumith Chintala)
Copyright (c) 2011-2014 Idiap Research Institute (Ronan Collobert)
Copyright (c) 2012-2014 Deepmind Technologies (Koray Kavukcuoglu)
Copyright (c) 2011-2012 NEC Laboratories America (Koray Kavukcuoglu)
Copyright (c) 2011-2013 NYU (Clement Farabet)
Copyright (c) 2006-2010 NEC Laboratories America (Ronan Collobert, Leon Bottou,
Iain Melvin, Jason Weston) Copyright (c) 2006 Idiap Research Institute
(Samy Bengio) Copyright (c) 2001-2004 Idiap Research Institute (Ronan Collobert,
Samy Bengio, Johnny Mariethoz)
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. Neither the names of Facebook, Deepmind Technologies, NYU, NEC Laboratories
America and IDIAP Research Institute nor the names of its contributors may be
used to endorse or promote products derived from this software without
specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef SIMDJSON_INTERNAL_INSTRUCTION_SET_H
#define SIMDJSON_INTERNAL_INSTRUCTION_SET_H
namespace simdjson {
namespace internal {
enum instruction_set {
DEFAULT = 0x0,
NEON = 0x1,
AVX2 = 0x4,
SSE42 = 0x8,
PCLMULQDQ = 0x10,
BMI1 = 0x20,
BMI2 = 0x40,
ALTIVEC = 0x80,
AVX512F = 0x100,
AVX512DQ = 0x200,
AVX512IFMA = 0x400,
AVX512PF = 0x800,
AVX512ER = 0x1000,
AVX512CD = 0x2000,
AVX512BW = 0x4000,
AVX512VL = 0x8000,
AVX512VBMI2 = 0x10000
};
} // namespace internal
} // namespace simdjson
#endif // SIMDJSON_INTERNAL_INSTRUCTION_SET_H
/* end file simdjson/internal/instruction_set.h */
/* skipped duplicate #include "simdjson/internal/dom_parser_implementation.h" */
/* skipped duplicate #include "simdjson/internal/jsoncharutils_tables.h" */
/* skipped duplicate #include "simdjson/internal/numberparsing_tables.h" */
/* including simdjson/internal/simdprune_tables.h: #include "simdjson/internal/simdprune_tables.h" */
/* begin file simdjson/internal/simdprune_tables.h */
#ifndef SIMDJSON_INTERNAL_SIMDPRUNE_TABLES_H
#define SIMDJSON_INTERNAL_SIMDPRUNE_TABLES_H
/* skipped duplicate #include "simdjson/base.h" */
#include <cstdint>
namespace simdjson { // table modified and copied from
namespace internal { // http://graphics.stanford.edu/~seander/bithacks.html#CountBitsSetTable
extern SIMDJSON_DLLIMPORTEXPORT const unsigned char BitsSetTable256mul2[256];
extern SIMDJSON_DLLIMPORTEXPORT const uint8_t pshufb_combine_table[272];
// 256 * 8 bytes = 2kB, easily fits in cache.
extern SIMDJSON_DLLIMPORTEXPORT const uint64_t thintable_epi8[256];
} // namespace internal
} // namespace simdjson
#endif // SIMDJSON_INTERNAL_SIMDPRUNE_TABLES_H
/* end file simdjson/internal/simdprune_tables.h */
#endif // SIMDJSON_GENERIC_DEPENDENCIES_H
/* end file simdjson/generic/dependencies.h */
/* including generic/dependencies.h: #include <generic/dependencies.h> */
/* begin file generic/dependencies.h */
#ifdef SIMDJSON_CONDITIONAL_INCLUDE
#error generic/dependencies.h must be included before defining SIMDJSON_CONDITIONAL_INCLUDE!
#endif
#ifndef SIMDJSON_SRC_GENERIC_DEPENDENCIES_H
#define SIMDJSON_SRC_GENERIC_DEPENDENCIES_H
/* skipped duplicate #include <base.h> */
#endif // SIMDJSON_SRC_GENERIC_DEPENDENCIES_H
/* end file generic/dependencies.h */
/* including generic/stage1/dependencies.h: #include <generic/stage1/dependencies.h> */
/* begin file generic/stage1/dependencies.h */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_DEPENDENCIES_H
#define SIMDJSON_SRC_GENERIC_STAGE1_DEPENDENCIES_H
#endif // SIMDJSON_SRC_GENERIC_STAGE1_DEPENDENCIES_H
/* end file generic/stage1/dependencies.h */
/* including generic/stage2/dependencies.h: #include <generic/stage2/dependencies.h> */
/* begin file generic/stage2/dependencies.h */
#ifndef SIMDJSON_SRC_GENERIC_STAGE2_DEPENDENCIES_H
#define SIMDJSON_SRC_GENERIC_STAGE2_DEPENDENCIES_H
/* including simdjson/dom/document.h: #include <simdjson/dom/document.h> */
/* begin file simdjson/dom/document.h */
#ifndef SIMDJSON_DOM_DOCUMENT_H
#define SIMDJSON_DOM_DOCUMENT_H
/* including simdjson/dom/base.h: #include "simdjson/dom/base.h" */
/* begin file simdjson/dom/base.h */
#ifndef SIMDJSON_DOM_BASE_H
#define SIMDJSON_DOM_BASE_H
/* skipped duplicate #include "simdjson/base.h" */
namespace simdjson {
/**
* @brief A DOM API on top of the simdjson parser.
*/
namespace dom {
/** The default batch size for parser.parse_many() and parser.load_many() */
static constexpr size_t DEFAULT_BATCH_SIZE = 1000000;
/**
* Some adversary might try to set the batch size to 0 or 1, which might cause problems.
* We set a minimum of 32B since anything else is highly likely to be an error. In practice,
* most users will want a much larger batch size.
*
* All non-negative MINIMAL_BATCH_SIZE values should be 'safe' except that, obviously, no JSON
* document can ever span 0 or 1 byte and that very large values would create memory allocation issues.
*/
static constexpr size_t MINIMAL_BATCH_SIZE = 32;
/**
* It is wasteful to allocate memory for tiny documents (e.g., 4 bytes).
*/
static constexpr size_t MINIMAL_DOCUMENT_CAPACITY = 32;
class array;
class document;
class document_stream;
class element;
class key_value_pair;
class object;
class parser;
#ifdef SIMDJSON_THREADS_ENABLED
struct stage1_worker;
#endif // SIMDJSON_THREADS_ENABLED
} // namespace dom
namespace internal {
template<typename T>
class string_builder;
class tape_ref;
} // namespace internal
} // namespace simdjson
#endif // SIMDJSON_DOM_BASE_H
/* end file simdjson/dom/base.h */
#include <memory>
namespace simdjson {
namespace dom {
/**
* A parsed JSON document.
*
* This class cannot be copied, only moved, to avoid unintended allocations.
*/
class document {
public:
/**
* Create a document container with zero capacity.
*
* The parser will allocate capacity as needed.
*/
document() noexcept = default;
~document() noexcept = default;
/**
* Take another document's buffers.
*
* @param other The document to take. Its capacity is zeroed and it is invalidated.
*/
document(document &&other) noexcept = default;
/** @private */
document(const document &) = delete; // Disallow copying
/**
* Take another document's buffers.
*
* @param other The document to take. Its capacity is zeroed.
*/
document &operator=(document &&other) noexcept = default;
/** @private */
document &operator=(const document &) = delete; // Disallow copying
/**
* Get the root element of this document as a JSON array.
*/
element root() const noexcept;
/**
* @private Dump the raw tape for debugging.
*
* @param os the stream to output to.
* @return false if the tape is likely wrong (e.g., you did not parse a valid JSON).
*/
bool dump_raw_tape(std::ostream &os) const noexcept;
/** @private Structural values. */
std::unique_ptr<uint64_t[]> tape{};
/** @private String values.
*
* Should be at least byte_capacity.
*/
std::unique_ptr<uint8_t[]> string_buf{};
/** @private Allocate memory to support
* input JSON documents of up to len bytes.
*
* When calling this function, you lose
* all the data.
*
* The memory allocation is strict: you
* can you use this function to increase
* or lower the amount of allocated memory.
* Passsing zero clears the memory.
*/
error_code allocate(size_t len) noexcept;
/** @private Capacity in bytes, in terms
* of how many bytes of input JSON we can
* support.
*/
size_t capacity() const noexcept;
private:
size_t allocated_capacity{0};
friend class parser;
}; // class document
} // namespace dom
} // namespace simdjson
#endif // SIMDJSON_DOM_DOCUMENT_H
/* end file simdjson/dom/document.h */
/* including simdjson/internal/tape_type.h: #include <simdjson/internal/tape_type.h> */
/* begin file simdjson/internal/tape_type.h */
#ifndef SIMDJSON_INTERNAL_TAPE_TYPE_H
#define SIMDJSON_INTERNAL_TAPE_TYPE_H
namespace simdjson {
namespace internal {
/**
* The possible types in the tape.
*/
enum class tape_type {
ROOT = 'r',
START_ARRAY = '[',
START_OBJECT = '{',
END_ARRAY = ']',
END_OBJECT = '}',
STRING = '"',
INT64 = 'l',
UINT64 = 'u',
DOUBLE = 'd',
TRUE_VALUE = 't',
FALSE_VALUE = 'f',
NULL_VALUE = 'n'
}; // enum class tape_type
} // namespace internal
} // namespace simdjson
#endif // SIMDJSON_INTERNAL_TAPE_TYPE_H
/* end file simdjson/internal/tape_type.h */
#endif // SIMDJSON_SRC_GENERIC_STAGE2_DEPENDENCIES_H
/* end file generic/stage2/dependencies.h */
/* including implementation.cpp: #include <implementation.cpp> */
/* begin file implementation.cpp */
#ifndef SIMDJSON_SRC_IMPLEMENTATION_CPP
#define SIMDJSON_SRC_IMPLEMENTATION_CPP
/* skipped duplicate #include <base.h> */
/* skipped duplicate #include <simdjson/generic/dependencies.h> */
/* skipped duplicate #include <simdjson/implementation.h> */
/* including internal/isadetection.h: #include <internal/isadetection.h> */
/* begin file internal/isadetection.h */
/* From
https://github.com/endorno/pytorch/blob/master/torch/lib/TH/generic/simd/simd.h
Highly modified.
Copyright (c) 2016- Facebook, Inc (Adam Paszke)
Copyright (c) 2014- Facebook, Inc (Soumith Chintala)
Copyright (c) 2011-2014 Idiap Research Institute (Ronan Collobert)
Copyright (c) 2012-2014 Deepmind Technologies (Koray Kavukcuoglu)
Copyright (c) 2011-2012 NEC Laboratories America (Koray Kavukcuoglu)
Copyright (c) 2011-2013 NYU (Clement Farabet)
Copyright (c) 2006-2010 NEC Laboratories America (Ronan Collobert, Leon Bottou,
Iain Melvin, Jason Weston) Copyright (c) 2006 Idiap Research Institute
(Samy Bengio) Copyright (c) 2001-2004 Idiap Research Institute (Ronan Collobert,
Samy Bengio, Johnny Mariethoz)
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. Neither the names of Facebook, Deepmind Technologies, NYU, NEC Laboratories
America and IDIAP Research Institute nor the names of its contributors may be
used to endorse or promote products derived from this software without
specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef SIMDJSON_INTERNAL_ISADETECTION_H
#define SIMDJSON_INTERNAL_ISADETECTION_H
/* skipped duplicate #include "simdjson/internal/instruction_set.h" */
#include <cstdint>
#include <cstdlib>
#if defined(_MSC_VER)
#include <intrin.h>
#elif defined(HAVE_GCC_GET_CPUID) && defined(USE_GCC_GET_CPUID)
#include <cpuid.h>
#endif
namespace simdjson {
namespace internal {
#if defined(__PPC64__)
static inline uint32_t detect_supported_architectures() {
return instruction_set::ALTIVEC;
}
#elif defined(__aarch64__) || defined(_M_ARM64)
static inline uint32_t detect_supported_architectures() {
return instruction_set::NEON;
}
#elif defined(__x86_64__) || defined(_M_AMD64) // x64
namespace {
// Can be found on Intel ISA Reference for CPUID
constexpr uint32_t cpuid_avx2_bit = 1 << 5; ///< @private Bit 5 of EBX for EAX=0x7
constexpr uint32_t cpuid_bmi1_bit = 1 << 3; ///< @private bit 3 of EBX for EAX=0x7
constexpr uint32_t cpuid_bmi2_bit = 1 << 8; ///< @private bit 8 of EBX for EAX=0x7
constexpr uint32_t cpuid_avx512f_bit = 1 << 16; ///< @private bit 16 of EBX for EAX=0x7
constexpr uint32_t cpuid_avx512dq_bit = 1 << 17; ///< @private bit 17 of EBX for EAX=0x7
constexpr uint32_t cpuid_avx512ifma_bit = 1 << 21; ///< @private bit 21 of EBX for EAX=0x7
constexpr uint32_t cpuid_avx512pf_bit = 1 << 26; ///< @private bit 26 of EBX for EAX=0x7
constexpr uint32_t cpuid_avx512er_bit = 1 << 27; ///< @private bit 27 of EBX for EAX=0x7
constexpr uint32_t cpuid_avx512cd_bit = 1 << 28; ///< @private bit 28 of EBX for EAX=0x7
constexpr uint32_t cpuid_avx512bw_bit = 1 << 30; ///< @private bit 30 of EBX for EAX=0x7
constexpr uint32_t cpuid_avx512vl_bit = 1U << 31; ///< @private bit 31 of EBX for EAX=0x7
constexpr uint32_t cpuid_avx512vbmi2_bit = 1 << 6; ///< @private bit 6 of ECX for EAX=0x7
constexpr uint64_t cpuid_avx256_saved = uint64_t(1) << 2; ///< @private bit 2 = AVX
constexpr uint64_t cpuid_avx512_saved = uint64_t(7) << 5; ///< @private bits 5,6,7 = opmask, ZMM_hi256, hi16_ZMM
constexpr uint32_t cpuid_sse42_bit = 1 << 20; ///< @private bit 20 of ECX for EAX=0x1
constexpr uint32_t cpuid_osxsave = (uint32_t(1) << 26) | (uint32_t(1) << 27); ///< @private bits 26+27 of ECX for EAX=0x1
constexpr uint32_t cpuid_pclmulqdq_bit = 1 << 1; ///< @private bit 1 of ECX for EAX=0x1
}
static inline void cpuid(uint32_t *eax, uint32_t *ebx, uint32_t *ecx,
uint32_t *edx) {
#if defined(_MSC_VER)
int cpu_info[4];
__cpuidex(cpu_info, *eax, *ecx);
*eax = cpu_info[0];
*ebx = cpu_info[1];
*ecx = cpu_info[2];
*edx = cpu_info[3];
#elif defined(HAVE_GCC_GET_CPUID) && defined(USE_GCC_GET_CPUID)
uint32_t level = *eax;
__get_cpuid(level, eax, ebx, ecx, edx);
#else
uint32_t a = *eax, b, c = *ecx, d;
asm volatile("cpuid\n\t" : "+a"(a), "=b"(b), "+c"(c), "=d"(d));
*eax = a;
*ebx = b;
*ecx = c;
*edx = d;
#endif
}
static inline uint64_t xgetbv() {
#if defined(_MSC_VER)
return _xgetbv(0);
#else
uint32_t xcr0_lo, xcr0_hi;
asm volatile("xgetbv\n\t" : "=a" (xcr0_lo), "=d" (xcr0_hi) : "c" (0));
return xcr0_lo | (uint64_t(xcr0_hi) << 32);
#endif
}
static inline uint32_t detect_supported_architectures() {
uint32_t eax, ebx, ecx, edx;
uint32_t host_isa = 0x0;
// EBX for EAX=0x1
eax = 0x1;
ecx = 0x0;
cpuid(&eax, &ebx, &ecx, &edx);
if (ecx & cpuid_sse42_bit) {
host_isa |= instruction_set::SSE42;
} else {
return host_isa; // everything after is redundant
}
if (ecx & cpuid_pclmulqdq_bit) {
host_isa |= instruction_set::PCLMULQDQ;
}
if ((ecx & cpuid_osxsave) != cpuid_osxsave) {
return host_isa;
}
// xgetbv for checking if the OS saves registers
uint64_t xcr0 = xgetbv();
if ((xcr0 & cpuid_avx256_saved) == 0) {
return host_isa;
}
// ECX for EAX=0x7
eax = 0x7;
ecx = 0x0;
cpuid(&eax, &ebx, &ecx, &edx);
if (ebx & cpuid_avx2_bit) {
host_isa |= instruction_set::AVX2;
}
if (ebx & cpuid_bmi1_bit) {
host_isa |= instruction_set::BMI1;
}
if (ebx & cpuid_bmi2_bit) {
host_isa |= instruction_set::BMI2;
}
if (!((xcr0 & cpuid_avx512_saved) == cpuid_avx512_saved)) {
return host_isa;
}
if (ebx & cpuid_avx512f_bit) {
host_isa |= instruction_set::AVX512F;
}
if (ebx & cpuid_avx512dq_bit) {
host_isa |= instruction_set::AVX512DQ;
}
if (ebx & cpuid_avx512ifma_bit) {
host_isa |= instruction_set::AVX512IFMA;
}
if (ebx & cpuid_avx512pf_bit) {
host_isa |= instruction_set::AVX512PF;
}
if (ebx & cpuid_avx512er_bit) {
host_isa |= instruction_set::AVX512ER;
}
if (ebx & cpuid_avx512cd_bit) {
host_isa |= instruction_set::AVX512CD;
}
if (ebx & cpuid_avx512bw_bit) {
host_isa |= instruction_set::AVX512BW;
}
if (ebx & cpuid_avx512vl_bit) {
host_isa |= instruction_set::AVX512VL;
}
if (ecx & cpuid_avx512vbmi2_bit) {
host_isa |= instruction_set::AVX512VBMI2;
}
return host_isa;
}
#else // fallback
static inline uint32_t detect_supported_architectures() {
return instruction_set::DEFAULT;
}
#endif // end SIMD extension detection code
} // namespace internal
} // namespace simdjson
#endif // SIMDJSON_INTERNAL_ISADETECTION_H
/* end file internal/isadetection.h */
#include <initializer_list>
namespace simdjson {
bool implementation::supported_by_runtime_system() const {
uint32_t required_instruction_sets = this->required_instruction_sets();
uint32_t supported_instruction_sets = internal::detect_supported_architectures();
return ((supported_instruction_sets & required_instruction_sets) == required_instruction_sets);
}
} // namespace simdjson
/* defining SIMDJSON_CONDITIONAL_INCLUDE */
#define SIMDJSON_CONDITIONAL_INCLUDE
#if SIMDJSON_IMPLEMENTATION_ARM64
/* including simdjson/arm64/implementation.h: #include <simdjson/arm64/implementation.h> */
/* begin file simdjson/arm64/implementation.h */
#ifndef SIMDJSON_ARM64_IMPLEMENTATION_H
#define SIMDJSON_ARM64_IMPLEMENTATION_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/implementation.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/instruction_set.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace arm64 {
/**
* @private
*/
class implementation final : public simdjson::implementation {
public:
simdjson_inline implementation() : simdjson::implementation("arm64", "ARM NEON", internal::instruction_set::NEON) {}
simdjson_warn_unused error_code create_dom_parser_implementation(
size_t capacity,
size_t max_length,
std::unique_ptr<internal::dom_parser_implementation>& dst
) const noexcept final;
simdjson_warn_unused error_code minify(const uint8_t *buf, size_t len, uint8_t *dst, size_t &dst_len) const noexcept final;
simdjson_warn_unused bool validate_utf8(const char *buf, size_t len) const noexcept final;
};
} // namespace arm64
} // namespace simdjson
#endif // SIMDJSON_ARM64_IMPLEMENTATION_H
/* end file simdjson/arm64/implementation.h */
namespace simdjson {
namespace internal {
static const arm64::implementation* get_arm64_singleton() {
static const arm64::implementation arm64_singleton{};
return &arm64_singleton;
}
} // namespace internal
} // namespace simdjson
#endif // SIMDJSON_IMPLEMENTATION_ARM64
#if SIMDJSON_IMPLEMENTATION_FALLBACK
/* including simdjson/fallback/implementation.h: #include <simdjson/fallback/implementation.h> */
/* begin file simdjson/fallback/implementation.h */
#ifndef SIMDJSON_FALLBACK_IMPLEMENTATION_H
#define SIMDJSON_FALLBACK_IMPLEMENTATION_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/fallback/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/implementation.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace fallback {
/**
* @private
*/
class implementation final : public simdjson::implementation {
public:
simdjson_inline implementation() : simdjson::implementation(
"fallback",
"Generic fallback implementation",
0
) {}
simdjson_warn_unused error_code create_dom_parser_implementation(
size_t capacity,
size_t max_length,
std::unique_ptr<simdjson::internal::dom_parser_implementation>& dst
) const noexcept final;
simdjson_warn_unused error_code minify(const uint8_t *buf, size_t len, uint8_t *dst, size_t &dst_len) const noexcept final;
simdjson_warn_unused bool validate_utf8(const char *buf, size_t len) const noexcept final;
};
} // namespace fallback
} // namespace simdjson
#endif // SIMDJSON_FALLBACK_IMPLEMENTATION_H
/* end file simdjson/fallback/implementation.h */
namespace simdjson {
namespace internal {
static const fallback::implementation* get_fallback_singleton() {
static const fallback::implementation fallback_singleton{};
return &fallback_singleton;
}
} // namespace internal
} // namespace simdjson
#endif // SIMDJSON_IMPLEMENTATION_FALLBACK
#if SIMDJSON_IMPLEMENTATION_HASWELL
/* including simdjson/haswell/implementation.h: #include <simdjson/haswell/implementation.h> */
/* begin file simdjson/haswell/implementation.h */
#ifndef SIMDJSON_HASWELL_IMPLEMENTATION_H
#define SIMDJSON_HASWELL_IMPLEMENTATION_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/haswell/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/implementation.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/instruction_set.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
// The constructor may be executed on any host, so we take care not to use SIMDJSON_TARGET_HASWELL
namespace simdjson {
namespace haswell {
/**
* @private
*/
class implementation final : public simdjson::implementation {
public:
simdjson_inline implementation() : simdjson::implementation(
"haswell",
"Intel/AMD AVX2",
internal::instruction_set::AVX2 | internal::instruction_set::PCLMULQDQ | internal::instruction_set::BMI1 | internal::instruction_set::BMI2
) {}
simdjson_warn_unused error_code create_dom_parser_implementation(
size_t capacity,
size_t max_length,
std::unique_ptr<internal::dom_parser_implementation>& dst
) const noexcept final;
simdjson_warn_unused error_code minify(const uint8_t *buf, size_t len, uint8_t *dst, size_t &dst_len) const noexcept final;
simdjson_warn_unused bool validate_utf8(const char *buf, size_t len) const noexcept final;
};
} // namespace haswell
} // namespace simdjson
#endif // SIMDJSON_HASWELL_IMPLEMENTATION_H
/* end file simdjson/haswell/implementation.h */
namespace simdjson {
namespace internal {
static const haswell::implementation* get_haswell_singleton() {
static const haswell::implementation haswell_singleton{};
return &haswell_singleton;
}
} // namespace internal
} // namespace simdjson
#endif
#if SIMDJSON_IMPLEMENTATION_ICELAKE
/* including simdjson/icelake/implementation.h: #include <simdjson/icelake/implementation.h> */
/* begin file simdjson/icelake/implementation.h */
#ifndef SIMDJSON_ICELAKE_IMPLEMENTATION_H
#define SIMDJSON_ICELAKE_IMPLEMENTATION_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/icelake/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/implementation.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/instruction_set.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
// The constructor may be executed on any host, so we take care not to use SIMDJSON_TARGET_ICELAKE
namespace simdjson {
namespace icelake {
/**
* @private
*/
class implementation final : public simdjson::implementation {
public:
simdjson_inline implementation() : simdjson::implementation(
"icelake",
"Intel/AMD AVX512",
internal::instruction_set::AVX2 | internal::instruction_set::PCLMULQDQ | internal::instruction_set::BMI1 | internal::instruction_set::BMI2 | internal::instruction_set::AVX512F | internal::instruction_set::AVX512DQ | internal::instruction_set::AVX512CD | internal::instruction_set::AVX512BW | internal::instruction_set::AVX512VL | internal::instruction_set::AVX512VBMI2
) {}
simdjson_warn_unused error_code create_dom_parser_implementation(
size_t capacity,
size_t max_length,
std::unique_ptr<internal::dom_parser_implementation>& dst
) const noexcept final;
simdjson_warn_unused error_code minify(const uint8_t *buf, size_t len, uint8_t *dst, size_t &dst_len) const noexcept final;
simdjson_warn_unused bool validate_utf8(const char *buf, size_t len) const noexcept final;
};
} // namespace icelake
} // namespace simdjson
#endif // SIMDJSON_ICELAKE_IMPLEMENTATION_H
/* end file simdjson/icelake/implementation.h */
namespace simdjson {
namespace internal {
static const icelake::implementation* get_icelake_singleton() {
static const icelake::implementation icelake_singleton{};
return &icelake_singleton;
}
} // namespace internal
} // namespace simdjson
#endif
#if SIMDJSON_IMPLEMENTATION_PPC64
/* including simdjson/ppc64/implementation.h: #include <simdjson/ppc64/implementation.h> */
/* begin file simdjson/ppc64/implementation.h */
#ifndef SIMDJSON_PPC64_IMPLEMENTATION_H
#define SIMDJSON_PPC64_IMPLEMENTATION_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/ppc64/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/implementation.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/instruction_set.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
/**
* Implementation for ALTIVEC (PPC64).
*/
namespace ppc64 {
/**
* @private
*/
class implementation final : public simdjson::implementation {
public:
simdjson_inline implementation()
: simdjson::implementation("ppc64", "PPC64 ALTIVEC",
internal::instruction_set::ALTIVEC) {}
simdjson_warn_unused error_code create_dom_parser_implementation(
size_t capacity, size_t max_length,
std::unique_ptr<internal::dom_parser_implementation> &dst)
const noexcept final;
simdjson_warn_unused error_code minify(const uint8_t *buf, size_t len,
uint8_t *dst,
size_t &dst_len) const noexcept final;
simdjson_warn_unused bool validate_utf8(const char *buf,
size_t len) const noexcept final;
};
} // namespace ppc64
} // namespace simdjson
#endif // SIMDJSON_PPC64_IMPLEMENTATION_H
/* end file simdjson/ppc64/implementation.h */
namespace simdjson {
namespace internal {
static const ppc64::implementation* get_ppc64_singleton() {
static const ppc64::implementation ppc64_singleton{};
return &ppc64_singleton;
}
} // namespace internal
} // namespace simdjson
#endif // SIMDJSON_IMPLEMENTATION_PPC64
#if SIMDJSON_IMPLEMENTATION_WESTMERE
/* including simdjson/westmere/implementation.h: #include <simdjson/westmere/implementation.h> */
/* begin file simdjson/westmere/implementation.h */
#ifndef SIMDJSON_WESTMERE_IMPLEMENTATION_H
#define SIMDJSON_WESTMERE_IMPLEMENTATION_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/westmere/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/implementation.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/instruction_set.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
// The constructor may be executed on any host, so we take care not to use SIMDJSON_TARGET_WESTMERE
namespace simdjson {
namespace westmere {
/**
* @private
*/
class implementation final : public simdjson::implementation {
public:
simdjson_inline implementation() : simdjson::implementation("westmere", "Intel/AMD SSE4.2", internal::instruction_set::SSE42 | internal::instruction_set::PCLMULQDQ) {}
simdjson_warn_unused error_code create_dom_parser_implementation(
size_t capacity,
size_t max_length,
std::unique_ptr<internal::dom_parser_implementation>& dst
) const noexcept final;
simdjson_warn_unused error_code minify(const uint8_t *buf, size_t len, uint8_t *dst, size_t &dst_len) const noexcept final;
simdjson_warn_unused bool validate_utf8(const char *buf, size_t len) const noexcept final;
};
} // namespace westmere
} // namespace simdjson
#endif // SIMDJSON_WESTMERE_IMPLEMENTATION_H
/* end file simdjson/westmere/implementation.h */
namespace simdjson {
namespace internal {
static const simdjson::westmere::implementation* get_westmere_singleton() {
static const simdjson::westmere::implementation westmere_singleton{};
return &westmere_singleton;
}
} // namespace internal
} // namespace simdjson
#endif // SIMDJSON_IMPLEMENTATION_WESTMERE
/* undefining SIMDJSON_CONDITIONAL_INCLUDE */
#undef SIMDJSON_CONDITIONAL_INCLUDE
namespace simdjson {
namespace internal {
// When there is a single implementation, we should not pay a price
// for dispatching to the best implementation. We should just use the
// one we have. This is a compile-time check.
#define SIMDJSON_SINGLE_IMPLEMENTATION (SIMDJSON_IMPLEMENTATION_ICELAKE \
+ SIMDJSON_IMPLEMENTATION_HASWELL + SIMDJSON_IMPLEMENTATION_WESTMERE \
+ SIMDJSON_IMPLEMENTATION_ARM64 + SIMDJSON_IMPLEMENTATION_PPC64 \
+ SIMDJSON_IMPLEMENTATION_FALLBACK == 1)
#if SIMDJSON_SINGLE_IMPLEMENTATION
static const implementation* get_single_implementation() {
return
#if SIMDJSON_IMPLEMENTATION_ICELAKE
get_icelake_singleton();
#endif
#if SIMDJSON_IMPLEMENTATION_HASWELL
get_haswell_singleton();
#endif
#if SIMDJSON_IMPLEMENTATION_WESTMERE
get_westmere_singleton();
#endif
#if SIMDJSON_IMPLEMENTATION_ARM64
get_arm64_singleton();
#endif
#if SIMDJSON_IMPLEMENTATION_PPC64
get_ppc64_singleton();
#endif
#if SIMDJSON_IMPLEMENTATION_FALLBACK
get_fallback_singleton();
#endif
}
#endif
// Static array of known implementations. We're hoping these get baked into the executable
// without requiring a static initializer.
/**
* @private Detects best supported implementation on first use, and sets it
*/
class detect_best_supported_implementation_on_first_use final : public implementation {
public:
const std::string &name() const noexcept final { return set_best()->name(); }
const std::string &description() const noexcept final { return set_best()->description(); }
uint32_t required_instruction_sets() const noexcept final { return set_best()->required_instruction_sets(); }
simdjson_warn_unused error_code create_dom_parser_implementation(
size_t capacity,
size_t max_length,
std::unique_ptr<internal::dom_parser_implementation>& dst
) const noexcept final {
return set_best()->create_dom_parser_implementation(capacity, max_length, dst);
}
simdjson_warn_unused error_code minify(const uint8_t *buf, size_t len, uint8_t *dst, size_t &dst_len) const noexcept final {
return set_best()->minify(buf, len, dst, dst_len);
}
simdjson_warn_unused bool validate_utf8(const char * buf, size_t len) const noexcept final override {
return set_best()->validate_utf8(buf, len);
}
simdjson_inline detect_best_supported_implementation_on_first_use() noexcept : implementation("best_supported_detector", "Detects the best supported implementation and sets it", 0) {}
private:
const implementation *set_best() const noexcept;
};
static const std::initializer_list<const implementation *>& get_available_implementation_pointers() {
static const std::initializer_list<const implementation *> available_implementation_pointers {
#if SIMDJSON_IMPLEMENTATION_ICELAKE
get_icelake_singleton(),
#endif
#if SIMDJSON_IMPLEMENTATION_HASWELL
get_haswell_singleton(),
#endif
#if SIMDJSON_IMPLEMENTATION_WESTMERE
get_westmere_singleton(),
#endif
#if SIMDJSON_IMPLEMENTATION_ARM64
get_arm64_singleton(),
#endif
#if SIMDJSON_IMPLEMENTATION_PPC64
get_ppc64_singleton(),
#endif
#if SIMDJSON_IMPLEMENTATION_FALLBACK
get_fallback_singleton(),
#endif
}; // available_implementation_pointers
return available_implementation_pointers;
}
// So we can return UNSUPPORTED_ARCHITECTURE from the parser when there is no support
class unsupported_implementation final : public implementation {
public:
simdjson_warn_unused error_code create_dom_parser_implementation(
size_t,
size_t,
std::unique_ptr<internal::dom_parser_implementation>&
) const noexcept final {
return UNSUPPORTED_ARCHITECTURE;
}
simdjson_warn_unused error_code minify(const uint8_t *, size_t, uint8_t *, size_t &) const noexcept final override {
return UNSUPPORTED_ARCHITECTURE;
}
simdjson_warn_unused bool validate_utf8(const char *, size_t) const noexcept final override {
return false; // Just refuse to validate. Given that we have a fallback implementation
// it seems unlikely that unsupported_implementation will ever be used. If it is used,
// then it will flag all strings as invalid. The alternative is to return an error_code
// from which the user has to figure out whether the string is valid UTF-8... which seems
// like a lot of work just to handle the very unlikely case that we have an unsupported
// implementation. And, when it does happen (that we have an unsupported implementation),
// what are the chances that the programmer has a fallback? Given that *we* provide the
// fallback, it implies that the programmer would need a fallback for our fallback.
}
unsupported_implementation() : implementation("unsupported", "Unsupported CPU (no detected SIMD instructions)", 0) {}
};
const unsupported_implementation* get_unsupported_singleton() {
static const unsupported_implementation unsupported_singleton{};
return &unsupported_singleton;
}
size_t available_implementation_list::size() const noexcept {
return internal::get_available_implementation_pointers().size();
}
const implementation * const *available_implementation_list::begin() const noexcept {
return internal::get_available_implementation_pointers().begin();
}
const implementation * const *available_implementation_list::end() const noexcept {
return internal::get_available_implementation_pointers().end();
}
const implementation *available_implementation_list::detect_best_supported() const noexcept {
// They are prelisted in priority order, so we just go down the list
uint32_t supported_instruction_sets = internal::detect_supported_architectures();
for (const implementation *impl : internal::get_available_implementation_pointers()) {
uint32_t required_instruction_sets = impl->required_instruction_sets();
if ((supported_instruction_sets & required_instruction_sets) == required_instruction_sets) { return impl; }
}
return get_unsupported_singleton(); // this should never happen?
}
const implementation *detect_best_supported_implementation_on_first_use::set_best() const noexcept {
SIMDJSON_PUSH_DISABLE_WARNINGS
SIMDJSON_DISABLE_DEPRECATED_WARNING // Disable CRT_SECURE warning on MSVC: manually verified this is safe
char *force_implementation_name = getenv("SIMDJSON_FORCE_IMPLEMENTATION");
SIMDJSON_POP_DISABLE_WARNINGS
if (force_implementation_name) {
auto force_implementation = get_available_implementations()[force_implementation_name];
if (force_implementation) {
return get_active_implementation() = force_implementation;
} else {
// Note: abort() and stderr usage within the library is forbidden.
return get_active_implementation() = get_unsupported_singleton();
}
}
return get_active_implementation() = get_available_implementations().detect_best_supported();
}
} // namespace internal
SIMDJSON_DLLIMPORTEXPORT const internal::available_implementation_list& get_available_implementations() {
static const internal::available_implementation_list available_implementations{};
return available_implementations;
}
SIMDJSON_DLLIMPORTEXPORT internal::atomic_ptr<const implementation>& get_active_implementation() {
#if SIMDJSON_SINGLE_IMPLEMENTATION
// We immediately select the only implementation we have, skipping the
// detect_best_supported_implementation_on_first_use_singleton.
static internal::atomic_ptr<const implementation> active_implementation{internal::get_single_implementation()};
return active_implementation;
#else
static const internal::detect_best_supported_implementation_on_first_use detect_best_supported_implementation_on_first_use_singleton;
static internal::atomic_ptr<const implementation> active_implementation{&detect_best_supported_implementation_on_first_use_singleton};
return active_implementation;
#endif
}
simdjson_warn_unused error_code minify(const char *buf, size_t len, char *dst, size_t &dst_len) noexcept {
return get_active_implementation()->minify(reinterpret_cast<const uint8_t *>(buf), len, reinterpret_cast<uint8_t *>(dst), dst_len);
}
simdjson_warn_unused bool validate_utf8(const char *buf, size_t len) noexcept {
return get_active_implementation()->validate_utf8(buf, len);
}
const implementation * builtin_implementation() {
static const implementation * builtin_impl = get_available_implementations()[SIMDJSON_STRINGIFY(SIMDJSON_BUILTIN_IMPLEMENTATION)];
assert(builtin_impl);
return builtin_impl;
}
} // namespace simdjson
#endif // SIMDJSON_SRC_IMPLEMENTATION_CPP
/* end file implementation.cpp */
/* defining SIMDJSON_CONDITIONAL_INCLUDE */
#define SIMDJSON_CONDITIONAL_INCLUDE
#if SIMDJSON_IMPLEMENTATION_ARM64
/* including arm64.cpp: #include <arm64.cpp> */
/* begin file arm64.cpp */
#ifndef SIMDJSON_SRC_ARM64_CPP
#define SIMDJSON_SRC_ARM64_CPP
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include <base.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
/* including simdjson/arm64.h: #include <simdjson/arm64.h> */
/* begin file simdjson/arm64.h */
#ifndef SIMDJSON_ARM64_H
#define SIMDJSON_ARM64_H
/* including simdjson/arm64/begin.h: #include "simdjson/arm64/begin.h" */
/* begin file simdjson/arm64/begin.h */
/* defining SIMDJSON_IMPLEMENTATION to "arm64" */
#define SIMDJSON_IMPLEMENTATION arm64
/* including simdjson/arm64/base.h: #include "simdjson/arm64/base.h" */
/* begin file simdjson/arm64/base.h */
#ifndef SIMDJSON_ARM64_BASE_H
#define SIMDJSON_ARM64_BASE_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
/**
* Implementation for NEON (ARMv8).
*/
namespace arm64 {
class implementation;
namespace {
namespace simd {
template <typename T> struct simd8;
template <typename T> struct simd8x64;
} // namespace simd
} // unnamed namespace
} // namespace arm64
} // namespace simdjson
#endif // SIMDJSON_ARM64_BASE_H
/* end file simdjson/arm64/base.h */
/* including simdjson/arm64/intrinsics.h: #include "simdjson/arm64/intrinsics.h" */
/* begin file simdjson/arm64/intrinsics.h */
#ifndef SIMDJSON_ARM64_INTRINSICS_H
#define SIMDJSON_ARM64_INTRINSICS_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/arm64/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
// This should be the correct header whether
// you use visual studio or other compilers.
#include <arm_neon.h>
static_assert(sizeof(uint8x16_t) <= simdjson::SIMDJSON_PADDING, "insufficient padding for arm64");
#endif // SIMDJSON_ARM64_INTRINSICS_H
/* end file simdjson/arm64/intrinsics.h */
/* including simdjson/arm64/bitmanipulation.h: #include "simdjson/arm64/bitmanipulation.h" */
/* begin file simdjson/arm64/bitmanipulation.h */
#ifndef SIMDJSON_ARM64_BITMANIPULATION_H
#define SIMDJSON_ARM64_BITMANIPULATION_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/arm64/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/arm64/intrinsics.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace arm64 {
namespace {
// We sometimes call trailing_zero on inputs that are zero,
// but the algorithms do not end up using the returned value.
// Sadly, sanitizers are not smart enough to figure it out.
SIMDJSON_NO_SANITIZE_UNDEFINED
// This function can be used safely even if not all bytes have been
// initialized.
// See issue https://github.com/simdjson/simdjson/issues/1965
SIMDJSON_NO_SANITIZE_MEMORY
simdjson_inline int trailing_zeroes(uint64_t input_num) {
#ifdef SIMDJSON_REGULAR_VISUAL_STUDIO
unsigned long ret;
// Search the mask data from least significant bit (LSB)
// to the most significant bit (MSB) for a set bit (1).
_BitScanForward64(&ret, input_num);
return (int)ret;
#else // SIMDJSON_REGULAR_VISUAL_STUDIO
return __builtin_ctzll(input_num);
#endif // SIMDJSON_REGULAR_VISUAL_STUDIO
}
/* result might be undefined when input_num is zero */
simdjson_inline uint64_t clear_lowest_bit(uint64_t input_num) {
return input_num & (input_num-1);
}
/* result might be undefined when input_num is zero */
simdjson_inline int leading_zeroes(uint64_t input_num) {
#ifdef SIMDJSON_REGULAR_VISUAL_STUDIO
unsigned long leading_zero = 0;
// Search the mask data from most significant bit (MSB)
// to least significant bit (LSB) for a set bit (1).
if (_BitScanReverse64(&leading_zero, input_num))
return (int)(63 - leading_zero);
else
return 64;
#else
return __builtin_clzll(input_num);
#endif// SIMDJSON_REGULAR_VISUAL_STUDIO
}
/* result might be undefined when input_num is zero */
simdjson_inline int count_ones(uint64_t input_num) {
return vaddv_u8(vcnt_u8(vcreate_u8(input_num)));
}
#if defined(__GNUC__) // catches clang and gcc
/**
* ARM has a fast 64-bit "bit reversal function" that is handy. However,
* it is not generally available as an intrinsic function under Visual
* Studio (though this might be changing). Even under clang/gcc, we
* apparently need to invoke inline assembly.
*/
/*
* We use SIMDJSON_PREFER_REVERSE_BITS as a hint that algorithms that
* work well with bit reversal may use it.
*/
#define SIMDJSON_PREFER_REVERSE_BITS 1
/* reverse the bits */
simdjson_inline uint64_t reverse_bits(uint64_t input_num) {
uint64_t rev_bits;
__asm("rbit %0, %1" : "=r"(rev_bits) : "r"(input_num));
return rev_bits;
}
/**
* Flips bit at index 63 - lz. Thus if you have 'leading_zeroes' leading zeroes,
* then this will set to zero the leading bit. It is possible for leading_zeroes to be
* greating or equal to 63 in which case we trigger undefined behavior, but the output
* of such undefined behavior is never used.
**/
SIMDJSON_NO_SANITIZE_UNDEFINED
simdjson_inline uint64_t zero_leading_bit(uint64_t rev_bits, int leading_zeroes) {
return rev_bits ^ (uint64_t(0x8000000000000000) >> leading_zeroes);
}
#endif
simdjson_inline bool add_overflow(uint64_t value1, uint64_t value2, uint64_t *result) {
#ifdef SIMDJSON_REGULAR_VISUAL_STUDIO
*result = value1 + value2;
return *result < value1;
#else
return __builtin_uaddll_overflow(value1, value2,
reinterpret_cast<unsigned long long *>(result));
#endif
}
} // unnamed namespace
} // namespace arm64
} // namespace simdjson
#endif // SIMDJSON_ARM64_BITMANIPULATION_H
/* end file simdjson/arm64/bitmanipulation.h */
/* including simdjson/arm64/bitmask.h: #include "simdjson/arm64/bitmask.h" */
/* begin file simdjson/arm64/bitmask.h */
#ifndef SIMDJSON_ARM64_BITMASK_H
#define SIMDJSON_ARM64_BITMASK_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/arm64/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace arm64 {
namespace {
//
// Perform a "cumulative bitwise xor," flipping bits each time a 1 is encountered.
//
// For example, prefix_xor(00100100) == 00011100
//
simdjson_inline uint64_t prefix_xor(uint64_t bitmask) {
/////////////
// We could do this with PMULL, but it is apparently slow.
//
//#ifdef __ARM_FEATURE_CRYPTO // some ARM processors lack this extension
//return vmull_p64(-1ULL, bitmask);
//#else
// Analysis by @sebpop:
// When diffing the assembly for src/stage1_find_marks.cpp I see that the eors are all spread out
// in between other vector code, so effectively the extra cycles of the sequence do not matter
// because the GPR units are idle otherwise and the critical path is on the FP side.
// Also the PMULL requires two extra fmovs: GPR->FP (3 cycles in N1, 5 cycles in A72 )
// and FP->GPR (2 cycles on N1 and 5 cycles on A72.)
///////////
bitmask ^= bitmask << 1;
bitmask ^= bitmask << 2;
bitmask ^= bitmask << 4;
bitmask ^= bitmask << 8;
bitmask ^= bitmask << 16;
bitmask ^= bitmask << 32;
return bitmask;
}
} // unnamed namespace
} // namespace arm64
} // namespace simdjson
#endif
/* end file simdjson/arm64/bitmask.h */
/* including simdjson/arm64/numberparsing_defs.h: #include "simdjson/arm64/numberparsing_defs.h" */
/* begin file simdjson/arm64/numberparsing_defs.h */
#ifndef SIMDJSON_ARM64_NUMBERPARSING_DEFS_H
#define SIMDJSON_ARM64_NUMBERPARSING_DEFS_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/arm64/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/arm64/intrinsics.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/numberparsing_tables.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#include <cstring>
#if _M_ARM64
// __umulh requires intrin.h
#include <intrin.h>
#endif // _M_ARM64
namespace simdjson {
namespace arm64 {
namespace numberparsing {
// we don't have SSE, so let us use a scalar function
// credit: https://johnnylee-sde.github.io/Fast-numeric-string-to-int/
/** @private */
static simdjson_inline uint32_t parse_eight_digits_unrolled(const uint8_t *chars) {
uint64_t val;
std::memcpy(&val, chars, sizeof(uint64_t));
val = (val & 0x0F0F0F0F0F0F0F0F) * 2561 >> 8;
val = (val & 0x00FF00FF00FF00FF) * 6553601 >> 16;
return uint32_t((val & 0x0000FFFF0000FFFF) * 42949672960001 >> 32);
}
simdjson_inline internal::value128 full_multiplication(uint64_t value1, uint64_t value2) {
internal::value128 answer;
#if SIMDJSON_REGULAR_VISUAL_STUDIO || SIMDJSON_IS_32BITS
#ifdef _M_ARM64
// ARM64 has native support for 64-bit multiplications, no need to emultate
answer.high = __umulh(value1, value2);
answer.low = value1 * value2;
#else
answer.low = _umul128(value1, value2, &answer.high); // _umul128 not available on ARM64
#endif // _M_ARM64
#else // SIMDJSON_REGULAR_VISUAL_STUDIO || SIMDJSON_IS_32BITS
__uint128_t r = (static_cast<__uint128_t>(value1)) * value2;
answer.low = uint64_t(r);
answer.high = uint64_t(r >> 64);
#endif
return answer;
}
} // namespace numberparsing
} // namespace arm64
} // namespace simdjson
#define SIMDJSON_SWAR_NUMBER_PARSING 1
#endif // SIMDJSON_ARM64_NUMBERPARSING_DEFS_H
/* end file simdjson/arm64/numberparsing_defs.h */
/* including simdjson/arm64/simd.h: #include "simdjson/arm64/simd.h" */
/* begin file simdjson/arm64/simd.h */
#ifndef SIMDJSON_ARM64_SIMD_H
#define SIMDJSON_ARM64_SIMD_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/arm64/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/arm64/bitmanipulation.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/simdprune_tables.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace arm64 {
namespace {
namespace simd {
#ifdef SIMDJSON_REGULAR_VISUAL_STUDIO
namespace {
// Start of private section with Visual Studio workaround
#ifndef simdjson_make_uint8x16_t
#define simdjson_make_uint8x16_t(x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11, x12, \
x13, x14, x15, x16) \
([=]() { \
uint8_t array[16] = {x1, x2, x3, x4, x5, x6, x7, x8, \
x9, x10, x11, x12, x13, x14, x15, x16}; \
return vld1q_u8(array); \
}())
#endif
#ifndef simdjson_make_int8x16_t
#define simdjson_make_int8x16_t(x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11, x12, \
x13, x14, x15, x16) \
([=]() { \
int8_t array[16] = {x1, x2, x3, x4, x5, x6, x7, x8, \
x9, x10, x11, x12, x13, x14, x15, x16}; \
return vld1q_s8(array); \
}())
#endif
#ifndef simdjson_make_uint8x8_t
#define simdjson_make_uint8x8_t(x1, x2, x3, x4, x5, x6, x7, x8) \
([=]() { \
uint8_t array[8] = {x1, x2, x3, x4, x5, x6, x7, x8}; \
return vld1_u8(array); \
}())
#endif
#ifndef simdjson_make_int8x8_t
#define simdjson_make_int8x8_t(x1, x2, x3, x4, x5, x6, x7, x8) \
([=]() { \
int8_t array[8] = {x1, x2, x3, x4, x5, x6, x7, x8}; \
return vld1_s8(array); \
}())
#endif
#ifndef simdjson_make_uint16x8_t
#define simdjson_make_uint16x8_t(x1, x2, x3, x4, x5, x6, x7, x8) \
([=]() { \
uint16_t array[8] = {x1, x2, x3, x4, x5, x6, x7, x8}; \
return vld1q_u16(array); \
}())
#endif
#ifndef simdjson_make_int16x8_t
#define simdjson_make_int16x8_t(x1, x2, x3, x4, x5, x6, x7, x8) \
([=]() { \
int16_t array[8] = {x1, x2, x3, x4, x5, x6, x7, x8}; \
return vld1q_s16(array); \
}())
#endif
// End of private section with Visual Studio workaround
} // namespace
#endif // SIMDJSON_REGULAR_VISUAL_STUDIO
template<typename T>
struct simd8;
//
// Base class of simd8<uint8_t> and simd8<bool>, both of which use uint8x16_t internally.
//
template<typename T, typename Mask=simd8<bool>>
struct base_u8 {
uint8x16_t value;
static const int SIZE = sizeof(value);
// Conversion from/to SIMD register
simdjson_inline base_u8(const uint8x16_t _value) : value(_value) {}
simdjson_inline operator const uint8x16_t&() const { return this->value; }
simdjson_inline operator uint8x16_t&() { return this->value; }
// Bit operations
simdjson_inline simd8<T> operator|(const simd8<T> other) const { return vorrq_u8(*this, other); }
simdjson_inline simd8<T> operator&(const simd8<T> other) const { return vandq_u8(*this, other); }
simdjson_inline simd8<T> operator^(const simd8<T> other) const { return veorq_u8(*this, other); }
simdjson_inline simd8<T> bit_andnot(const simd8<T> other) const { return vbicq_u8(*this, other); }
simdjson_inline simd8<T> operator~() const { return *this ^ 0xFFu; }
simdjson_inline simd8<T>& operator|=(const simd8<T> other) { auto this_cast = static_cast<simd8<T>*>(this); *this_cast = *this_cast | other; return *this_cast; }
simdjson_inline simd8<T>& operator&=(const simd8<T> other) { auto this_cast = static_cast<simd8<T>*>(this); *this_cast = *this_cast & other; return *this_cast; }
simdjson_inline simd8<T>& operator^=(const simd8<T> other) { auto this_cast = static_cast<simd8<T>*>(this); *this_cast = *this_cast ^ other; return *this_cast; }
friend simdjson_inline Mask operator==(const simd8<T> lhs, const simd8<T> rhs) { return vceqq_u8(lhs, rhs); }
template<int N=1>
simdjson_inline simd8<T> prev(const simd8<T> prev_chunk) const {
return vextq_u8(prev_chunk, *this, 16 - N);
}
};
// SIMD byte mask type (returned by things like eq and gt)
template<>
struct simd8<bool>: base_u8<bool> {
typedef uint16_t bitmask_t;
typedef uint32_t bitmask2_t;
static simdjson_inline simd8<bool> splat(bool _value) { return vmovq_n_u8(uint8_t(-(!!_value))); }
simdjson_inline simd8(const uint8x16_t _value) : base_u8<bool>(_value) {}
// False constructor
simdjson_inline simd8() : simd8(vdupq_n_u8(0)) {}
// Splat constructor
simdjson_inline simd8(bool _value) : simd8(splat(_value)) {}
// We return uint32_t instead of uint16_t because that seems to be more efficient for most
// purposes (cutting it down to uint16_t costs performance in some compilers).
simdjson_inline uint32_t to_bitmask() const {
#ifdef SIMDJSON_REGULAR_VISUAL_STUDIO
const uint8x16_t bit_mask = simdjson_make_uint8x16_t(0x01, 0x02, 0x4, 0x8, 0x10, 0x20, 0x40, 0x80,
0x01, 0x02, 0x4, 0x8, 0x10, 0x20, 0x40, 0x80);
#else
const uint8x16_t bit_mask = {0x01, 0x02, 0x4, 0x8, 0x10, 0x20, 0x40, 0x80,
0x01, 0x02, 0x4, 0x8, 0x10, 0x20, 0x40, 0x80};
#endif
auto minput = *this & bit_mask;
uint8x16_t tmp = vpaddq_u8(minput, minput);
tmp = vpaddq_u8(tmp, tmp);
tmp = vpaddq_u8(tmp, tmp);
return vgetq_lane_u16(vreinterpretq_u16_u8(tmp), 0);
}
simdjson_inline bool any() const { return vmaxvq_u8(*this) != 0; }
};
// Unsigned bytes
template<>
struct simd8<uint8_t>: base_u8<uint8_t> {
static simdjson_inline uint8x16_t splat(uint8_t _value) { return vmovq_n_u8(_value); }
static simdjson_inline uint8x16_t zero() { return vdupq_n_u8(0); }
static simdjson_inline uint8x16_t load(const uint8_t* values) { return vld1q_u8(values); }
simdjson_inline simd8(const uint8x16_t _value) : base_u8<uint8_t>(_value) {}
// Zero constructor
simdjson_inline simd8() : simd8(zero()) {}
// Array constructor
simdjson_inline simd8(const uint8_t values[16]) : simd8(load(values)) {}
// Splat constructor
simdjson_inline simd8(uint8_t _value) : simd8(splat(_value)) {}
// Member-by-member initialization
#ifdef SIMDJSON_REGULAR_VISUAL_STUDIO
simdjson_inline simd8(
uint8_t v0, uint8_t v1, uint8_t v2, uint8_t v3, uint8_t v4, uint8_t v5, uint8_t v6, uint8_t v7,
uint8_t v8, uint8_t v9, uint8_t v10, uint8_t v11, uint8_t v12, uint8_t v13, uint8_t v14, uint8_t v15
) : simd8(simdjson_make_uint8x16_t(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
)) {}
#else
simdjson_inline simd8(
uint8_t v0, uint8_t v1, uint8_t v2, uint8_t v3, uint8_t v4, uint8_t v5, uint8_t v6, uint8_t v7,
uint8_t v8, uint8_t v9, uint8_t v10, uint8_t v11, uint8_t v12, uint8_t v13, uint8_t v14, uint8_t v15
) : simd8(uint8x16_t{
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
}) {}
#endif
// Repeat 16 values as many times as necessary (usually for lookup tables)
simdjson_inline static simd8<uint8_t> repeat_16(
uint8_t v0, uint8_t v1, uint8_t v2, uint8_t v3, uint8_t v4, uint8_t v5, uint8_t v6, uint8_t v7,
uint8_t v8, uint8_t v9, uint8_t v10, uint8_t v11, uint8_t v12, uint8_t v13, uint8_t v14, uint8_t v15
) {
return simd8<uint8_t>(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
);
}
// Store to array
simdjson_inline void store(uint8_t dst[16]) const { return vst1q_u8(dst, *this); }
// Saturated math
simdjson_inline simd8<uint8_t> saturating_add(const simd8<uint8_t> other) const { return vqaddq_u8(*this, other); }
simdjson_inline simd8<uint8_t> saturating_sub(const simd8<uint8_t> other) const { return vqsubq_u8(*this, other); }
// Addition/subtraction are the same for signed and unsigned
simdjson_inline simd8<uint8_t> operator+(const simd8<uint8_t> other) const { return vaddq_u8(*this, other); }
simdjson_inline simd8<uint8_t> operator-(const simd8<uint8_t> other) const { return vsubq_u8(*this, other); }
simdjson_inline simd8<uint8_t>& operator+=(const simd8<uint8_t> other) { *this = *this + other; return *this; }
simdjson_inline simd8<uint8_t>& operator-=(const simd8<uint8_t> other) { *this = *this - other; return *this; }
// Order-specific operations
simdjson_inline uint8_t max_val() const { return vmaxvq_u8(*this); }
simdjson_inline uint8_t min_val() const { return vminvq_u8(*this); }
simdjson_inline simd8<uint8_t> max_val(const simd8<uint8_t> other) const { return vmaxq_u8(*this, other); }
simdjson_inline simd8<uint8_t> min_val(const simd8<uint8_t> other) const { return vminq_u8(*this, other); }
simdjson_inline simd8<bool> operator<=(const simd8<uint8_t> other) const { return vcleq_u8(*this, other); }
simdjson_inline simd8<bool> operator>=(const simd8<uint8_t> other) const { return vcgeq_u8(*this, other); }
simdjson_inline simd8<bool> operator<(const simd8<uint8_t> other) const { return vcltq_u8(*this, other); }
simdjson_inline simd8<bool> operator>(const simd8<uint8_t> other) const { return vcgtq_u8(*this, other); }
// Same as >, but instead of guaranteeing all 1's == true, false = 0 and true = nonzero. For ARM, returns all 1's.
simdjson_inline simd8<uint8_t> gt_bits(const simd8<uint8_t> other) const { return simd8<uint8_t>(*this > other); }
// Same as <, but instead of guaranteeing all 1's == true, false = 0 and true = nonzero. For ARM, returns all 1's.
simdjson_inline simd8<uint8_t> lt_bits(const simd8<uint8_t> other) const { return simd8<uint8_t>(*this < other); }
// Bit-specific operations
simdjson_inline simd8<bool> any_bits_set(simd8<uint8_t> bits) const { return vtstq_u8(*this, bits); }
simdjson_inline bool any_bits_set_anywhere() const { return this->max_val() != 0; }
simdjson_inline bool any_bits_set_anywhere(simd8<uint8_t> bits) const { return (*this & bits).any_bits_set_anywhere(); }
template<int N>
simdjson_inline simd8<uint8_t> shr() const { return vshrq_n_u8(*this, N); }
template<int N>
simdjson_inline simd8<uint8_t> shl() const { return vshlq_n_u8(*this, N); }
// Perform a lookup assuming the value is between 0 and 16 (undefined behavior for out of range values)
template<typename L>
simdjson_inline simd8<L> lookup_16(simd8<L> lookup_table) const {
return lookup_table.apply_lookup_16_to(*this);
}
// Copies to 'output" all bytes corresponding to a 0 in the mask (interpreted as a bitset).
// Passing a 0 value for mask would be equivalent to writing out every byte to output.
// Only the first 16 - count_ones(mask) bytes of the result are significant but 16 bytes
// get written.
// Design consideration: it seems like a function with the
// signature simd8<L> compress(uint16_t mask) would be
// sensible, but the AVX ISA makes this kind of approach difficult.
template<typename L>
simdjson_inline void compress(uint16_t mask, L * output) const {
using internal::thintable_epi8;
using internal::BitsSetTable256mul2;
using internal::pshufb_combine_table;
// this particular implementation was inspired by work done by @animetosho
// we do it in two steps, first 8 bytes and then second 8 bytes
uint8_t mask1 = uint8_t(mask); // least significant 8 bits
uint8_t mask2 = uint8_t(mask >> 8); // most significant 8 bits
// next line just loads the 64-bit values thintable_epi8[mask1] and
// thintable_epi8[mask2] into a 128-bit register, using only
// two instructions on most compilers.
uint64x2_t shufmask64 = {thintable_epi8[mask1], thintable_epi8[mask2]};
uint8x16_t shufmask = vreinterpretq_u8_u64(shufmask64);
// we increment by 0x08 the second half of the mask
#ifdef SIMDJSON_REGULAR_VISUAL_STUDIO
uint8x16_t inc = simdjson_make_uint8x16_t(0, 0, 0, 0, 0, 0, 0, 0, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08);
#else
uint8x16_t inc = {0, 0, 0, 0, 0, 0, 0, 0, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08};
#endif
shufmask = vaddq_u8(shufmask, inc);
// this is the version "nearly pruned"
uint8x16_t pruned = vqtbl1q_u8(*this, shufmask);
// we still need to put the two halves together.
// we compute the popcount of the first half:
int pop1 = BitsSetTable256mul2[mask1];
// then load the corresponding mask, what it does is to write
// only the first pop1 bytes from the first 8 bytes, and then
// it fills in with the bytes from the second 8 bytes + some filling
// at the end.
uint8x16_t compactmask = vld1q_u8(reinterpret_cast<const uint8_t *>(pshufb_combine_table + pop1 * 8));
uint8x16_t answer = vqtbl1q_u8(pruned, compactmask);
vst1q_u8(reinterpret_cast<uint8_t*>(output), answer);
}
// Copies all bytes corresponding to a 0 in the low half of the mask (interpreted as a
// bitset) to output1, then those corresponding to a 0 in the high half to output2.
template<typename L>
simdjson_inline void compress_halves(uint16_t mask, L *output1, L *output2) const {
using internal::thintable_epi8;
uint8_t mask1 = uint8_t(mask); // least significant 8 bits
uint8_t mask2 = uint8_t(mask >> 8); // most significant 8 bits
uint8x8_t compactmask1 = vcreate_u8(thintable_epi8[mask1]);
uint8x8_t compactmask2 = vcreate_u8(thintable_epi8[mask2]);
// we increment by 0x08 the second half of the mask
#ifdef SIMDJSON_REGULAR_VISUAL_STUDIO
uint8x8_t inc = simdjson_make_uint8x8_t(0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08);
#else
uint8x8_t inc = {0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08};
#endif
compactmask2 = vadd_u8(compactmask2, inc);
// store each result (with the second store possibly overlapping the first)
vst1_u8((uint8_t*)output1, vqtbl1_u8(*this, compactmask1));
vst1_u8((uint8_t*)output2, vqtbl1_u8(*this, compactmask2));
}
template<typename L>
simdjson_inline simd8<L> lookup_16(
L replace0, L replace1, L replace2, L replace3,
L replace4, L replace5, L replace6, L replace7,
L replace8, L replace9, L replace10, L replace11,
L replace12, L replace13, L replace14, L replace15) const {
return lookup_16(simd8<L>::repeat_16(
replace0, replace1, replace2, replace3,
replace4, replace5, replace6, replace7,
replace8, replace9, replace10, replace11,
replace12, replace13, replace14, replace15
));
}
template<typename T>
simdjson_inline simd8<uint8_t> apply_lookup_16_to(const simd8<T> original) {
return vqtbl1q_u8(*this, simd8<uint8_t>(original));
}
};
// Signed bytes
template<>
struct simd8<int8_t> {
int8x16_t value;
static simdjson_inline simd8<int8_t> splat(int8_t _value) { return vmovq_n_s8(_value); }
static simdjson_inline simd8<int8_t> zero() { return vdupq_n_s8(0); }
static simdjson_inline simd8<int8_t> load(const int8_t values[16]) { return vld1q_s8(values); }
// Conversion from/to SIMD register
simdjson_inline simd8(const int8x16_t _value) : value{_value} {}
simdjson_inline operator const int8x16_t&() const { return this->value; }
simdjson_inline operator int8x16_t&() { return this->value; }
// Zero constructor
simdjson_inline simd8() : simd8(zero()) {}
// Splat constructor
simdjson_inline simd8(int8_t _value) : simd8(splat(_value)) {}
// Array constructor
simdjson_inline simd8(const int8_t* values) : simd8(load(values)) {}
// Member-by-member initialization
#ifdef SIMDJSON_REGULAR_VISUAL_STUDIO
simdjson_inline simd8(
int8_t v0, int8_t v1, int8_t v2, int8_t v3, int8_t v4, int8_t v5, int8_t v6, int8_t v7,
int8_t v8, int8_t v9, int8_t v10, int8_t v11, int8_t v12, int8_t v13, int8_t v14, int8_t v15
) : simd8(simdjson_make_int8x16_t(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
)) {}
#else
simdjson_inline simd8(
int8_t v0, int8_t v1, int8_t v2, int8_t v3, int8_t v4, int8_t v5, int8_t v6, int8_t v7,
int8_t v8, int8_t v9, int8_t v10, int8_t v11, int8_t v12, int8_t v13, int8_t v14, int8_t v15
) : simd8(int8x16_t{
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
}) {}
#endif
// Repeat 16 values as many times as necessary (usually for lookup tables)
simdjson_inline static simd8<int8_t> repeat_16(
int8_t v0, int8_t v1, int8_t v2, int8_t v3, int8_t v4, int8_t v5, int8_t v6, int8_t v7,
int8_t v8, int8_t v9, int8_t v10, int8_t v11, int8_t v12, int8_t v13, int8_t v14, int8_t v15
) {
return simd8<int8_t>(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
);
}
// Store to array
simdjson_inline void store(int8_t dst[16]) const { return vst1q_s8(dst, *this); }
// Explicit conversion to/from unsigned
//
// Under Visual Studio/ARM64 uint8x16_t and int8x16_t are apparently the same type.
// In theory, we could check this occurrence with std::same_as and std::enabled_if but it is C++14
// and relatively ugly and hard to read.
#ifndef SIMDJSON_REGULAR_VISUAL_STUDIO
simdjson_inline explicit simd8(const uint8x16_t other): simd8(vreinterpretq_s8_u8(other)) {}
#endif
simdjson_inline explicit operator simd8<uint8_t>() const { return vreinterpretq_u8_s8(this->value); }
// Math
simdjson_inline simd8<int8_t> operator+(const simd8<int8_t> other) const { return vaddq_s8(*this, other); }
simdjson_inline simd8<int8_t> operator-(const simd8<int8_t> other) const { return vsubq_s8(*this, other); }
simdjson_inline simd8<int8_t>& operator+=(const simd8<int8_t> other) { *this = *this + other; return *this; }
simdjson_inline simd8<int8_t>& operator-=(const simd8<int8_t> other) { *this = *this - other; return *this; }
// Order-sensitive comparisons
simdjson_inline simd8<int8_t> max_val(const simd8<int8_t> other) const { return vmaxq_s8(*this, other); }
simdjson_inline simd8<int8_t> min_val(const simd8<int8_t> other) const { return vminq_s8(*this, other); }
simdjson_inline simd8<bool> operator>(const simd8<int8_t> other) const { return vcgtq_s8(*this, other); }
simdjson_inline simd8<bool> operator<(const simd8<int8_t> other) const { return vcltq_s8(*this, other); }
simdjson_inline simd8<bool> operator==(const simd8<int8_t> other) const { return vceqq_s8(*this, other); }
template<int N=1>
simdjson_inline simd8<int8_t> prev(const simd8<int8_t> prev_chunk) const {
return vextq_s8(prev_chunk, *this, 16 - N);
}
// Perform a lookup assuming no value is larger than 16
template<typename L>
simdjson_inline simd8<L> lookup_16(simd8<L> lookup_table) const {
return lookup_table.apply_lookup_16_to(*this);
}
template<typename L>
simdjson_inline simd8<L> lookup_16(
L replace0, L replace1, L replace2, L replace3,
L replace4, L replace5, L replace6, L replace7,
L replace8, L replace9, L replace10, L replace11,
L replace12, L replace13, L replace14, L replace15) const {
return lookup_16(simd8<L>::repeat_16(
replace0, replace1, replace2, replace3,
replace4, replace5, replace6, replace7,
replace8, replace9, replace10, replace11,
replace12, replace13, replace14, replace15
));
}
template<typename T>
simdjson_inline simd8<int8_t> apply_lookup_16_to(const simd8<T> original) {
return vqtbl1q_s8(*this, simd8<uint8_t>(original));
}
};
template<typename T>
struct simd8x64 {
static constexpr int NUM_CHUNKS = 64 / sizeof(simd8<T>);
static_assert(NUM_CHUNKS == 4, "ARM kernel should use four registers per 64-byte block.");
const simd8<T> chunks[NUM_CHUNKS];
simd8x64(const simd8x64<T>& o) = delete; // no copy allowed
simd8x64<T>& operator=(const simd8<T>& other) = delete; // no assignment allowed
simd8x64() = delete; // no default constructor allowed
simdjson_inline simd8x64(const simd8<T> chunk0, const simd8<T> chunk1, const simd8<T> chunk2, const simd8<T> chunk3) : chunks{chunk0, chunk1, chunk2, chunk3} {}
simdjson_inline simd8x64(const T ptr[64]) : chunks{simd8<T>::load(ptr), simd8<T>::load(ptr+16), simd8<T>::load(ptr+32), simd8<T>::load(ptr+48)} {}
simdjson_inline void store(T ptr[64]) const {
this->chunks[0].store(ptr+sizeof(simd8<T>)*0);
this->chunks[1].store(ptr+sizeof(simd8<T>)*1);
this->chunks[2].store(ptr+sizeof(simd8<T>)*2);
this->chunks[3].store(ptr+sizeof(simd8<T>)*3);
}
simdjson_inline simd8<T> reduce_or() const {
return (this->chunks[0] | this->chunks[1]) | (this->chunks[2] | this->chunks[3]);
}
simdjson_inline uint64_t compress(uint64_t mask, T * output) const {
uint64_t popcounts = vget_lane_u64(vreinterpret_u64_u8(vcnt_u8(vcreate_u8(~mask))), 0);
// compute the prefix sum of the popcounts of each byte
uint64_t offsets = popcounts * 0x0101010101010101;
this->chunks[0].compress_halves(uint16_t(mask), output, &output[popcounts & 0xFF]);
this->chunks[1].compress_halves(uint16_t(mask >> 16), &output[(offsets >> 8) & 0xFF], &output[(offsets >> 16) & 0xFF]);
this->chunks[2].compress_halves(uint16_t(mask >> 32), &output[(offsets >> 24) & 0xFF], &output[(offsets >> 32) & 0xFF]);
this->chunks[3].compress_halves(uint16_t(mask >> 48), &output[(offsets >> 40) & 0xFF], &output[(offsets >> 48) & 0xFF]);
return offsets >> 56;
}
simdjson_inline uint64_t to_bitmask() const {
#ifdef SIMDJSON_REGULAR_VISUAL_STUDIO
const uint8x16_t bit_mask = simdjson_make_uint8x16_t(
0x01, 0x02, 0x4, 0x8, 0x10, 0x20, 0x40, 0x80,
0x01, 0x02, 0x4, 0x8, 0x10, 0x20, 0x40, 0x80
);
#else
const uint8x16_t bit_mask = {
0x01, 0x02, 0x4, 0x8, 0x10, 0x20, 0x40, 0x80,
0x01, 0x02, 0x4, 0x8, 0x10, 0x20, 0x40, 0x80
};
#endif
// Add each of the elements next to each other, successively, to stuff each 8 byte mask into one.
uint8x16_t sum0 = vpaddq_u8(this->chunks[0] & bit_mask, this->chunks[1] & bit_mask);
uint8x16_t sum1 = vpaddq_u8(this->chunks[2] & bit_mask, this->chunks[3] & bit_mask);
sum0 = vpaddq_u8(sum0, sum1);
sum0 = vpaddq_u8(sum0, sum0);
return vgetq_lane_u64(vreinterpretq_u64_u8(sum0), 0);
}
simdjson_inline uint64_t eq(const T m) const {
const simd8<T> mask = simd8<T>::splat(m);
return simd8x64<bool>(
this->chunks[0] == mask,
this->chunks[1] == mask,
this->chunks[2] == mask,
this->chunks[3] == mask
).to_bitmask();
}
simdjson_inline uint64_t lteq(const T m) const {
const simd8<T> mask = simd8<T>::splat(m);
return simd8x64<bool>(
this->chunks[0] <= mask,
this->chunks[1] <= mask,
this->chunks[2] <= mask,
this->chunks[3] <= mask
).to_bitmask();
}
}; // struct simd8x64<T>
} // namespace simd
} // unnamed namespace
} // namespace arm64
} // namespace simdjson
#endif // SIMDJSON_ARM64_SIMD_H
/* end file simdjson/arm64/simd.h */
/* including simdjson/arm64/stringparsing_defs.h: #include "simdjson/arm64/stringparsing_defs.h" */
/* begin file simdjson/arm64/stringparsing_defs.h */
#ifndef SIMDJSON_ARM64_STRINGPARSING_DEFS_H
#define SIMDJSON_ARM64_STRINGPARSING_DEFS_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/arm64/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/arm64/simd.h" */
/* amalgamation skipped (editor-only): #include "simdjson/arm64/bitmanipulation.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace arm64 {
namespace {
using namespace simd;
// Holds backslashes and quotes locations.
struct backslash_and_quote {
public:
static constexpr uint32_t BYTES_PROCESSED = 32;
simdjson_inline static backslash_and_quote copy_and_find(const uint8_t *src, uint8_t *dst);
simdjson_inline bool has_quote_first() { return ((bs_bits - 1) & quote_bits) != 0; }
simdjson_inline bool has_backslash() { return bs_bits != 0; }
simdjson_inline int quote_index() { return trailing_zeroes(quote_bits); }
simdjson_inline int backslash_index() { return trailing_zeroes(bs_bits); }
uint32_t bs_bits;
uint32_t quote_bits;
}; // struct backslash_and_quote
simdjson_inline backslash_and_quote backslash_and_quote::copy_and_find(const uint8_t *src, uint8_t *dst) {
// this can read up to 31 bytes beyond the buffer size, but we require
// SIMDJSON_PADDING of padding
static_assert(SIMDJSON_PADDING >= (BYTES_PROCESSED - 1), "backslash and quote finder must process fewer than SIMDJSON_PADDING bytes");
simd8<uint8_t> v0(src);
simd8<uint8_t> v1(src + sizeof(v0));
v0.store(dst);
v1.store(dst + sizeof(v0));
// Getting a 64-bit bitmask is much cheaper than multiple 16-bit bitmasks on ARM; therefore, we
// smash them together into a 64-byte mask and get the bitmask from there.
uint64_t bs_and_quote = simd8x64<bool>(v0 == '\\', v1 == '\\', v0 == '"', v1 == '"').to_bitmask();
return {
uint32_t(bs_and_quote), // bs_bits
uint32_t(bs_and_quote >> 32) // quote_bits
};
}
} // unnamed namespace
} // namespace arm64
} // namespace simdjson
#endif // SIMDJSON_ARM64_STRINGPARSING_DEFS_H
/* end file simdjson/arm64/stringparsing_defs.h */
#define SIMDJSON_SKIP_BACKSLASH_SHORT_CIRCUIT 1
/* end file simdjson/arm64/begin.h */
/* including simdjson/generic/amalgamated.h for arm64: #include "simdjson/generic/amalgamated.h" */
/* begin file simdjson/generic/amalgamated.h for arm64 */
#if defined(SIMDJSON_CONDITIONAL_INCLUDE) && !defined(SIMDJSON_GENERIC_DEPENDENCIES_H)
#error simdjson/generic/dependencies.h must be included before simdjson/generic/amalgamated.h!
#endif
/* including simdjson/generic/base.h for arm64: #include "simdjson/generic/base.h" */
/* begin file simdjson/generic/base.h for arm64 */
#ifndef SIMDJSON_GENERIC_BASE_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_GENERIC_BASE_H */
/* amalgamation skipped (editor-only): #include "simdjson/base.h" */
/* amalgamation skipped (editor-only): // If we haven't got an implementation yet, we're in the editor, editing a generic file! Just */
/* amalgamation skipped (editor-only): // use the most advanced one we can so the most possible stuff can be tested. */
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_IMPLEMENTATION */
/* amalgamation skipped (editor-only): #include "simdjson/implementation_detection.h" */
/* amalgamation skipped (editor-only): #if SIMDJSON_IMPLEMENTATION_ICELAKE */
/* amalgamation skipped (editor-only): #include "simdjson/icelake/begin.h" */
/* amalgamation skipped (editor-only): #elif SIMDJSON_IMPLEMENTATION_HASWELL */
/* amalgamation skipped (editor-only): #include "simdjson/haswell/begin.h" */
/* amalgamation skipped (editor-only): #elif SIMDJSON_IMPLEMENTATION_WESTMERE */
/* amalgamation skipped (editor-only): #include "simdjson/westmere/begin.h" */
/* amalgamation skipped (editor-only): #elif SIMDJSON_IMPLEMENTATION_ARM64 */
/* amalgamation skipped (editor-only): #include "simdjson/arm64/begin.h" */
/* amalgamation skipped (editor-only): #elif SIMDJSON_IMPLEMENTATION_PPC64 */
/* amalgamation skipped (editor-only): #include "simdjson/ppc64/begin.h" */
/* amalgamation skipped (editor-only): #elif SIMDJSON_IMPLEMENTATION_FALLBACK */
/* amalgamation skipped (editor-only): #include "simdjson/fallback/begin.h" */
/* amalgamation skipped (editor-only): #else */
/* amalgamation skipped (editor-only): #error "All possible implementations (including fallback) have been disabled! simdjson will not run." */
/* amalgamation skipped (editor-only): #endif */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_IMPLEMENTATION */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace arm64 {
struct open_container;
class dom_parser_implementation;
/**
* The type of a JSON number
*/
enum class number_type {
floating_point_number=1, /// a binary64 number
signed_integer, /// a signed integer that fits in a 64-bit word using two's complement
unsigned_integer, /// a positive integer larger or equal to 1<<63
big_integer /// a big integer that does not fit in a 64-bit word
};
} // namespace arm64
} // namespace simdjson
#endif // SIMDJSON_GENERIC_BASE_H
/* end file simdjson/generic/base.h for arm64 */
/* including simdjson/generic/jsoncharutils.h for arm64: #include "simdjson/generic/jsoncharutils.h" */
/* begin file simdjson/generic/jsoncharutils.h for arm64 */
#ifndef SIMDJSON_GENERIC_JSONCHARUTILS_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_GENERIC_JSONCHARUTILS_H */
/* amalgamation skipped (editor-only): #include "simdjson/generic/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/jsoncharutils_tables.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/numberparsing_tables.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace arm64 {
namespace {
namespace jsoncharutils {
// return non-zero if not a structural or whitespace char
// zero otherwise
simdjson_inline uint32_t is_not_structural_or_whitespace(uint8_t c) {
return internal::structural_or_whitespace_negated[c];
}
simdjson_inline uint32_t is_structural_or_whitespace(uint8_t c) {
return internal::structural_or_whitespace[c];
}
// returns a value with the high 16 bits set if not valid
// otherwise returns the conversion of the 4 hex digits at src into the bottom
// 16 bits of the 32-bit return register
//
// see
// https://lemire.me/blog/2019/04/17/parsing-short-hexadecimal-strings-efficiently/
static inline uint32_t hex_to_u32_nocheck(
const uint8_t *src) { // strictly speaking, static inline is a C-ism
uint32_t v1 = internal::digit_to_val32[630 + src[0]];
uint32_t v2 = internal::digit_to_val32[420 + src[1]];
uint32_t v3 = internal::digit_to_val32[210 + src[2]];
uint32_t v4 = internal::digit_to_val32[0 + src[3]];
return v1 | v2 | v3 | v4;
}
// given a code point cp, writes to c
// the utf-8 code, outputting the length in
// bytes, if the length is zero, the code point
// is invalid
//
// This can possibly be made faster using pdep
// and clz and table lookups, but JSON documents
// have few escaped code points, and the following
// function looks cheap.
//
// Note: we assume that surrogates are treated separately
//
simdjson_inline size_t codepoint_to_utf8(uint32_t cp, uint8_t *c) {
if (cp <= 0x7F) {
c[0] = uint8_t(cp);
return 1; // ascii
}
if (cp <= 0x7FF) {
c[0] = uint8_t((cp >> 6) + 192);
c[1] = uint8_t((cp & 63) + 128);
return 2; // universal plane
// Surrogates are treated elsewhere...
//} //else if (0xd800 <= cp && cp <= 0xdfff) {
// return 0; // surrogates // could put assert here
} else if (cp <= 0xFFFF) {
c[0] = uint8_t((cp >> 12) + 224);
c[1] = uint8_t(((cp >> 6) & 63) + 128);
c[2] = uint8_t((cp & 63) + 128);
return 3;
} else if (cp <= 0x10FFFF) { // if you know you have a valid code point, this
// is not needed
c[0] = uint8_t((cp >> 18) + 240);
c[1] = uint8_t(((cp >> 12) & 63) + 128);
c[2] = uint8_t(((cp >> 6) & 63) + 128);
c[3] = uint8_t((cp & 63) + 128);
return 4;
}
// will return 0 when the code point was too large.
return 0; // bad r
}
#if SIMDJSON_IS_32BITS // _umul128 for x86, arm
// this is a slow emulation routine for 32-bit
//
static simdjson_inline uint64_t __emulu(uint32_t x, uint32_t y) {
return x * (uint64_t)y;
}
static simdjson_inline uint64_t _umul128(uint64_t ab, uint64_t cd, uint64_t *hi) {
uint64_t ad = __emulu((uint32_t)(ab >> 32), (uint32_t)cd);
uint64_t bd = __emulu((uint32_t)ab, (uint32_t)cd);
uint64_t adbc = ad + __emulu((uint32_t)ab, (uint32_t)(cd >> 32));
uint64_t adbc_carry = !!(adbc < ad);
uint64_t lo = bd + (adbc << 32);
*hi = __emulu((uint32_t)(ab >> 32), (uint32_t)(cd >> 32)) + (adbc >> 32) +
(adbc_carry << 32) + !!(lo < bd);
return lo;
}
#endif
} // namespace jsoncharutils
} // unnamed namespace
} // namespace arm64
} // namespace simdjson
#endif // SIMDJSON_GENERIC_JSONCHARUTILS_H
/* end file simdjson/generic/jsoncharutils.h for arm64 */
/* including simdjson/generic/atomparsing.h for arm64: #include "simdjson/generic/atomparsing.h" */
/* begin file simdjson/generic/atomparsing.h for arm64 */
#ifndef SIMDJSON_GENERIC_ATOMPARSING_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_GENERIC_ATOMPARSING_H */
/* amalgamation skipped (editor-only): #include "simdjson/generic/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/generic/jsoncharutils.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#include <cstring>
namespace simdjson {
namespace arm64 {
namespace {
/// @private
namespace atomparsing {
// The string_to_uint32 is exclusively used to map literal strings to 32-bit values.
// We use memcpy instead of a pointer cast to avoid undefined behaviors since we cannot
// be certain that the character pointer will be properly aligned.
// You might think that using memcpy makes this function expensive, but you'd be wrong.
// All decent optimizing compilers (GCC, clang, Visual Studio) will compile string_to_uint32("false");
// to the compile-time constant 1936482662.
simdjson_inline uint32_t string_to_uint32(const char* str) { uint32_t val; std::memcpy(&val, str, sizeof(uint32_t)); return val; }
// Again in str4ncmp we use a memcpy to avoid undefined behavior. The memcpy may appear expensive.
// Yet all decent optimizing compilers will compile memcpy to a single instruction, just about.
simdjson_warn_unused
simdjson_inline uint32_t str4ncmp(const uint8_t *src, const char* atom) {
uint32_t srcval; // we want to avoid unaligned 32-bit loads (undefined in C/C++)
static_assert(sizeof(uint32_t) <= SIMDJSON_PADDING, "SIMDJSON_PADDING must be larger than 4 bytes");
std::memcpy(&srcval, src, sizeof(uint32_t));
return srcval ^ string_to_uint32(atom);
}
simdjson_warn_unused
simdjson_inline bool is_valid_true_atom(const uint8_t *src) {
return (str4ncmp(src, "true") | jsoncharutils::is_not_structural_or_whitespace(src[4])) == 0;
}
simdjson_warn_unused
simdjson_inline bool is_valid_true_atom(const uint8_t *src, size_t len) {
if (len > 4) { return is_valid_true_atom(src); }
else if (len == 4) { return !str4ncmp(src, "true"); }
else { return false; }
}
simdjson_warn_unused
simdjson_inline bool is_valid_false_atom(const uint8_t *src) {
return (str4ncmp(src+1, "alse") | jsoncharutils::is_not_structural_or_whitespace(src[5])) == 0;
}
simdjson_warn_unused
simdjson_inline bool is_valid_false_atom(const uint8_t *src, size_t len) {
if (len > 5) { return is_valid_false_atom(src); }
else if (len == 5) { return !str4ncmp(src+1, "alse"); }
else { return false; }
}
simdjson_warn_unused
simdjson_inline bool is_valid_null_atom(const uint8_t *src) {
return (str4ncmp(src, "null") | jsoncharutils::is_not_structural_or_whitespace(src[4])) == 0;
}
simdjson_warn_unused
simdjson_inline bool is_valid_null_atom(const uint8_t *src, size_t len) {
if (len > 4) { return is_valid_null_atom(src); }
else if (len == 4) { return !str4ncmp(src, "null"); }
else { return false; }
}
} // namespace atomparsing
} // unnamed namespace
} // namespace arm64
} // namespace simdjson
#endif // SIMDJSON_GENERIC_ATOMPARSING_H
/* end file simdjson/generic/atomparsing.h for arm64 */
/* including simdjson/generic/dom_parser_implementation.h for arm64: #include "simdjson/generic/dom_parser_implementation.h" */
/* begin file simdjson/generic/dom_parser_implementation.h for arm64 */
#ifndef SIMDJSON_GENERIC_DOM_PARSER_IMPLEMENTATION_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_GENERIC_DOM_PARSER_IMPLEMENTATION_H */
/* amalgamation skipped (editor-only): #include "simdjson/generic/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/dom_parser_implementation.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace arm64 {
// expectation: sizeof(open_container) = 64/8.
struct open_container {
uint32_t tape_index; // where, on the tape, does the scope ([,{) begins
uint32_t count; // how many elements in the scope
}; // struct open_container
static_assert(sizeof(open_container) == 64/8, "Open container must be 64 bits");
class dom_parser_implementation final : public internal::dom_parser_implementation {
public:
/** Tape location of each open { or [ */
std::unique_ptr<open_container[]> open_containers{};
/** Whether each open container is a [ or { */
std::unique_ptr<bool[]> is_array{};
/** Buffer passed to stage 1 */
const uint8_t *buf{};
/** Length passed to stage 1 */
size_t len{0};
/** Document passed to stage 2 */
dom::document *doc{};
inline dom_parser_implementation() noexcept;
inline dom_parser_implementation(dom_parser_implementation &&other) noexcept;
inline dom_parser_implementation &operator=(dom_parser_implementation &&other) noexcept;
dom_parser_implementation(const dom_parser_implementation &) = delete;
dom_parser_implementation &operator=(const dom_parser_implementation &) = delete;
simdjson_warn_unused error_code parse(const uint8_t *buf, size_t len, dom::document &doc) noexcept final;
simdjson_warn_unused error_code stage1(const uint8_t *buf, size_t len, stage1_mode partial) noexcept final;
simdjson_warn_unused error_code stage2(dom::document &doc) noexcept final;
simdjson_warn_unused error_code stage2_next(dom::document &doc) noexcept final;
simdjson_warn_unused uint8_t *parse_string(const uint8_t *src, uint8_t *dst, bool allow_replacement) const noexcept final;
simdjson_warn_unused uint8_t *parse_wobbly_string(const uint8_t *src, uint8_t *dst) const noexcept final;
inline simdjson_warn_unused error_code set_capacity(size_t capacity) noexcept final;
inline simdjson_warn_unused error_code set_max_depth(size_t max_depth) noexcept final;
private:
simdjson_inline simdjson_warn_unused error_code set_capacity_stage1(size_t capacity);
};
} // namespace arm64
} // namespace simdjson
namespace simdjson {
namespace arm64 {
inline dom_parser_implementation::dom_parser_implementation() noexcept = default;
inline dom_parser_implementation::dom_parser_implementation(dom_parser_implementation &&other) noexcept = default;
inline dom_parser_implementation &dom_parser_implementation::operator=(dom_parser_implementation &&other) noexcept = default;
// Leaving these here so they can be inlined if so desired
inline simdjson_warn_unused error_code dom_parser_implementation::set_capacity(size_t capacity) noexcept {
if(capacity > SIMDJSON_MAXSIZE_BYTES) { return CAPACITY; }
// Stage 1 index output
size_t max_structures = SIMDJSON_ROUNDUP_N(capacity, 64) + 2 + 7;
structural_indexes.reset( new (std::nothrow) uint32_t[max_structures] );
if (!structural_indexes) { _capacity = 0; return MEMALLOC; }
structural_indexes[0] = 0;
n_structural_indexes = 0;
_capacity = capacity;
return SUCCESS;
}
inline simdjson_warn_unused error_code dom_parser_implementation::set_max_depth(size_t max_depth) noexcept {
// Stage 2 stacks
open_containers.reset(new (std::nothrow) open_container[max_depth]);
is_array.reset(new (std::nothrow) bool[max_depth]);
if (!is_array || !open_containers) { _max_depth = 0; return MEMALLOC; }
_max_depth = max_depth;
return SUCCESS;
}
} // namespace arm64
} // namespace simdjson
#endif // SIMDJSON_GENERIC_DOM_PARSER_IMPLEMENTATION_H
/* end file simdjson/generic/dom_parser_implementation.h for arm64 */
/* including simdjson/generic/implementation_simdjson_result_base.h for arm64: #include "simdjson/generic/implementation_simdjson_result_base.h" */
/* begin file simdjson/generic/implementation_simdjson_result_base.h for arm64 */
#ifndef SIMDJSON_GENERIC_IMPLEMENTATION_SIMDJSON_RESULT_BASE_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_GENERIC_IMPLEMENTATION_SIMDJSON_RESULT_BASE_H */
/* amalgamation skipped (editor-only): #include "simdjson/generic/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace arm64 {
// This is a near copy of include/error.h's implementation_simdjson_result_base, except it doesn't use std::pair
// so we can avoid inlining errors
// TODO reconcile these!
/**
* The result of a simdjson operation that could fail.
*
* Gives the option of reading error codes, or throwing an exception by casting to the desired result.
*
* This is a base class for implementations that want to add functions to the result type for
* chaining.
*
* Override like:
*
* struct simdjson_result<T> : public internal::implementation_simdjson_result_base<T> {
* simdjson_result() noexcept : internal::implementation_simdjson_result_base<T>() {}
* simdjson_result(error_code error) noexcept : internal::implementation_simdjson_result_base<T>(error) {}
* simdjson_result(T &&value) noexcept : internal::implementation_simdjson_result_base<T>(std::forward(value)) {}
* simdjson_result(T &&value, error_code error) noexcept : internal::implementation_simdjson_result_base<T>(value, error) {}
* // Your extra methods here
* }
*
* Then any method returning simdjson_result<T> will be chainable with your methods.
*/
template<typename T>
struct implementation_simdjson_result_base {
/**
* Create a new empty result with error = UNINITIALIZED.
*/
simdjson_inline implementation_simdjson_result_base() noexcept = default;
/**
* Create a new error result.
*/
simdjson_inline implementation_simdjson_result_base(error_code error) noexcept;
/**
* Create a new successful result.
*/
simdjson_inline implementation_simdjson_result_base(T &&value) noexcept;
/**
* Create a new result with both things (use if you don't want to branch when creating the result).
*/
simdjson_inline implementation_simdjson_result_base(T &&value, error_code error) noexcept;
/**
* Move the value and the error to the provided variables.
*
* @param value The variable to assign the value to. May not be set if there is an error.
* @param error The variable to assign the error to. Set to SUCCESS if there is no error.
*/
simdjson_inline void tie(T &value, error_code &error) && noexcept;
/**
* Move the value to the provided variable.
*
* @param value The variable to assign the value to. May not be set if there is an error.
*/
simdjson_inline error_code get(T &value) && noexcept;
/**
* The error.
*/
simdjson_inline error_code error() const noexcept;
#if SIMDJSON_EXCEPTIONS
/**
* Get the result value.
*
* @throw simdjson_error if there was an error.
*/
simdjson_inline T& value() & noexcept(false);
/**
* Take the result value (move it).
*
* @throw simdjson_error if there was an error.
*/
simdjson_inline T&& value() && noexcept(false);
/**
* Take the result value (move it).
*
* @throw simdjson_error if there was an error.
*/
simdjson_inline T&& take_value() && noexcept(false);
/**
* Cast to the value (will throw on error).
*
* @throw simdjson_error if there was an error.
*/
simdjson_inline operator T&&() && noexcept(false);
#endif // SIMDJSON_EXCEPTIONS
/**
* Get the result value. This function is safe if and only
* the error() method returns a value that evaluates to false.
*/
simdjson_inline const T& value_unsafe() const& noexcept;
/**
* Get the result value. This function is safe if and only
* the error() method returns a value that evaluates to false.
*/
simdjson_inline T& value_unsafe() & noexcept;
/**
* Take the result value (move it). This function is safe if and only
* the error() method returns a value that evaluates to false.
*/
simdjson_inline T&& value_unsafe() && noexcept;
protected:
/** users should never directly access first and second. **/
T first{}; /** Users should never directly access 'first'. **/
error_code second{UNINITIALIZED}; /** Users should never directly access 'second'. **/
}; // struct implementation_simdjson_result_base
} // namespace arm64
} // namespace simdjson
#endif // SIMDJSON_GENERIC_IMPLEMENTATION_SIMDJSON_RESULT_BASE_H
/* end file simdjson/generic/implementation_simdjson_result_base.h for arm64 */
/* including simdjson/generic/numberparsing.h for arm64: #include "simdjson/generic/numberparsing.h" */
/* begin file simdjson/generic/numberparsing.h for arm64 */
#ifndef SIMDJSON_GENERIC_NUMBERPARSING_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_GENERIC_NUMBERPARSING_H */
/* amalgamation skipped (editor-only): #include "simdjson/generic/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/generic/jsoncharutils.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/numberparsing_tables.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#include <limits>
#include <ostream>
#include <cstring>
namespace simdjson {
namespace arm64 {
namespace numberparsing {
#ifdef JSON_TEST_NUMBERS
#define INVALID_NUMBER(SRC) (found_invalid_number((SRC)), NUMBER_ERROR)
#define WRITE_INTEGER(VALUE, SRC, WRITER) (found_integer((VALUE), (SRC)), (WRITER).append_s64((VALUE)))
#define WRITE_UNSIGNED(VALUE, SRC, WRITER) (found_unsigned_integer((VALUE), (SRC)), (WRITER).append_u64((VALUE)))
#define WRITE_DOUBLE(VALUE, SRC, WRITER) (found_float((VALUE), (SRC)), (WRITER).append_double((VALUE)))
#define BIGINT_NUMBER(SRC) (found_invalid_number((SRC)), BIGINT_ERROR)
#else
#define INVALID_NUMBER(SRC) (NUMBER_ERROR)
#define WRITE_INTEGER(VALUE, SRC, WRITER) (WRITER).append_s64((VALUE))
#define WRITE_UNSIGNED(VALUE, SRC, WRITER) (WRITER).append_u64((VALUE))
#define WRITE_DOUBLE(VALUE, SRC, WRITER) (WRITER).append_double((VALUE))
#define BIGINT_NUMBER(SRC) (BIGINT_ERROR)
#endif
namespace {
// Convert a mantissa, an exponent and a sign bit into an ieee64 double.
// The real_exponent needs to be in [0, 2046] (technically real_exponent = 2047 would be acceptable).
// The mantissa should be in [0,1<<53). The bit at index (1ULL << 52) while be zeroed.
simdjson_inline double to_double(uint64_t mantissa, uint64_t real_exponent, bool negative) {
double d;
mantissa &= ~(1ULL << 52);
mantissa |= real_exponent << 52;
mantissa |= ((static_cast<uint64_t>(negative)) << 63);
std::memcpy(&d, &mantissa, sizeof(d));
return d;
}
// Attempts to compute i * 10^(power) exactly; and if "negative" is
// true, negate the result.
// This function will only work in some cases, when it does not work, success is
// set to false. This should work *most of the time* (like 99% of the time).
// We assume that power is in the [smallest_power,
// largest_power] interval: the caller is responsible for this check.
simdjson_inline bool compute_float_64(int64_t power, uint64_t i, bool negative, double &d) {
// we start with a fast path
// It was described in
// Clinger WD. How to read floating point numbers accurately.
// ACM SIGPLAN Notices. 1990
#ifndef FLT_EVAL_METHOD
#error "FLT_EVAL_METHOD should be defined, please include cfloat."
#endif
#if (FLT_EVAL_METHOD != 1) && (FLT_EVAL_METHOD != 0)
// We cannot be certain that x/y is rounded to nearest.
if (0 <= power && power <= 22 && i <= 9007199254740991)
#else
if (-22 <= power && power <= 22 && i <= 9007199254740991)
#endif
{
// convert the integer into a double. This is lossless since
// 0 <= i <= 2^53 - 1.
d = double(i);
//
// The general idea is as follows.
// If 0 <= s < 2^53 and if 10^0 <= p <= 10^22 then
// 1) Both s and p can be represented exactly as 64-bit floating-point
// values
// (binary64).
// 2) Because s and p can be represented exactly as floating-point values,
// then s * p
// and s / p will produce correctly rounded values.
//
if (power < 0) {
d = d / simdjson::internal::power_of_ten[-power];
} else {
d = d * simdjson::internal::power_of_ten[power];
}
if (negative) {
d = -d;
}
return true;
}
// When 22 < power && power < 22 + 16, we could
// hope for another, secondary fast path. It was
// described by David M. Gay in "Correctly rounded
// binary-decimal and decimal-binary conversions." (1990)
// If you need to compute i * 10^(22 + x) for x < 16,
// first compute i * 10^x, if you know that result is exact
// (e.g., when i * 10^x < 2^53),
// then you can still proceed and do (i * 10^x) * 10^22.
// Is this worth your time?
// You need 22 < power *and* power < 22 + 16 *and* (i * 10^(x-22) < 2^53)
// for this second fast path to work.
// If you you have 22 < power *and* power < 22 + 16, and then you
// optimistically compute "i * 10^(x-22)", there is still a chance that you
// have wasted your time if i * 10^(x-22) >= 2^53. It makes the use cases of
// this optimization maybe less common than we would like. Source:
// http://www.exploringbinary.com/fast-path-decimal-to-floating-point-conversion/
// also used in RapidJSON: https://rapidjson.org/strtod_8h_source.html
// The fast path has now failed, so we are failing back on the slower path.
// In the slow path, we need to adjust i so that it is > 1<<63 which is always
// possible, except if i == 0, so we handle i == 0 separately.
if(i == 0) {
d = negative ? -0.0 : 0.0;
return true;
}
// The exponent is 1024 + 63 + power
// + floor(log(5**power)/log(2)).
// The 1024 comes from the ieee64 standard.
// The 63 comes from the fact that we use a 64-bit word.
//
// Computing floor(log(5**power)/log(2)) could be
// slow. Instead we use a fast function.
//
// For power in (-400,350), we have that
// (((152170 + 65536) * power ) >> 16);
// is equal to
// floor(log(5**power)/log(2)) + power when power >= 0
// and it is equal to
// ceil(log(5**-power)/log(2)) + power when power < 0
//
// The 65536 is (1<<16) and corresponds to
// (65536 * power) >> 16 ---> power
//
// ((152170 * power ) >> 16) is equal to
// floor(log(5**power)/log(2))
//
// Note that this is not magic: 152170/(1<<16) is
// approximatively equal to log(5)/log(2).
// The 1<<16 value is a power of two; we could use a
// larger power of 2 if we wanted to.
//
int64_t exponent = (((152170 + 65536) * power) >> 16) + 1024 + 63;
// We want the most significant bit of i to be 1. Shift if needed.
int lz = leading_zeroes(i);
i <<= lz;
// We are going to need to do some 64-bit arithmetic to get a precise product.
// We use a table lookup approach.
// It is safe because
// power >= smallest_power
// and power <= largest_power
// We recover the mantissa of the power, it has a leading 1. It is always
// rounded down.
//
// We want the most significant 64 bits of the product. We know
// this will be non-zero because the most significant bit of i is
// 1.
const uint32_t index = 2 * uint32_t(power - simdjson::internal::smallest_power);
// Optimization: It may be that materializing the index as a variable might confuse some compilers and prevent effective complex-addressing loads. (Done for code clarity.)
//
// The full_multiplication function computes the 128-bit product of two 64-bit words
// with a returned value of type value128 with a "low component" corresponding to the
// 64-bit least significant bits of the product and with a "high component" corresponding
// to the 64-bit most significant bits of the product.
simdjson::internal::value128 firstproduct = full_multiplication(i, simdjson::internal::power_of_five_128[index]);
// Both i and power_of_five_128[index] have their most significant bit set to 1 which
// implies that the either the most or the second most significant bit of the product
// is 1. We pack values in this manner for efficiency reasons: it maximizes the use
// we make of the product. It also makes it easy to reason about the product: there
// is 0 or 1 leading zero in the product.
// Unless the least significant 9 bits of the high (64-bit) part of the full
// product are all 1s, then we know that the most significant 55 bits are
// exact and no further work is needed. Having 55 bits is necessary because
// we need 53 bits for the mantissa but we have to have one rounding bit and
// we can waste a bit if the most significant bit of the product is zero.
if((firstproduct.high & 0x1FF) == 0x1FF) {
// We want to compute i * 5^q, but only care about the top 55 bits at most.
// Consider the scenario where q>=0. Then 5^q may not fit in 64-bits. Doing
// the full computation is wasteful. So we do what is called a "truncated
// multiplication".
// We take the most significant 64-bits, and we put them in
// power_of_five_128[index]. Usually, that's good enough to approximate i * 5^q
// to the desired approximation using one multiplication. Sometimes it does not suffice.
// Then we store the next most significant 64 bits in power_of_five_128[index + 1], and
// then we get a better approximation to i * 5^q.
//
// That's for when q>=0. The logic for q<0 is somewhat similar but it is somewhat
// more complicated.
//
// There is an extra layer of complexity in that we need more than 55 bits of
// accuracy in the round-to-even scenario.
//
// The full_multiplication function computes the 128-bit product of two 64-bit words
// with a returned value of type value128 with a "low component" corresponding to the
// 64-bit least significant bits of the product and with a "high component" corresponding
// to the 64-bit most significant bits of the product.
simdjson::internal::value128 secondproduct = full_multiplication(i, simdjson::internal::power_of_five_128[index + 1]);
firstproduct.low += secondproduct.high;
if(secondproduct.high > firstproduct.low) { firstproduct.high++; }
// As it has been proven by Noble Mushtak and Daniel Lemire in "Fast Number Parsing Without
// Fallback" (https://arxiv.org/abs/2212.06644), at this point we are sure that the product
// is sufficiently accurate, and more computation is not needed.
}
uint64_t lower = firstproduct.low;
uint64_t upper = firstproduct.high;
// The final mantissa should be 53 bits with a leading 1.
// We shift it so that it occupies 54 bits with a leading 1.
///////
uint64_t upperbit = upper >> 63;
uint64_t mantissa = upper >> (upperbit + 9);
lz += int(1 ^ upperbit);
// Here we have mantissa < (1<<54).
int64_t real_exponent = exponent - lz;
if (simdjson_unlikely(real_exponent <= 0)) { // we have a subnormal?
// Here have that real_exponent <= 0 so -real_exponent >= 0
if(-real_exponent + 1 >= 64) { // if we have more than 64 bits below the minimum exponent, you have a zero for sure.
d = negative ? -0.0 : 0.0;
return true;
}
// next line is safe because -real_exponent + 1 < 0
mantissa >>= -real_exponent + 1;
// Thankfully, we can't have both "round-to-even" and subnormals because
// "round-to-even" only occurs for powers close to 0.
mantissa += (mantissa & 1); // round up
mantissa >>= 1;
// There is a weird scenario where we don't have a subnormal but just.
// Suppose we start with 2.2250738585072013e-308, we end up
// with 0x3fffffffffffff x 2^-1023-53 which is technically subnormal
// whereas 0x40000000000000 x 2^-1023-53 is normal. Now, we need to round
// up 0x3fffffffffffff x 2^-1023-53 and once we do, we are no longer
// subnormal, but we can only know this after rounding.
// So we only declare a subnormal if we are smaller than the threshold.
real_exponent = (mantissa < (uint64_t(1) << 52)) ? 0 : 1;
d = to_double(mantissa, real_exponent, negative);
return true;
}
// We have to round to even. The "to even" part
// is only a problem when we are right in between two floats
// which we guard against.
// If we have lots of trailing zeros, we may fall right between two
// floating-point values.
//
// The round-to-even cases take the form of a number 2m+1 which is in (2^53,2^54]
// times a power of two. That is, it is right between a number with binary significand
// m and another number with binary significand m+1; and it must be the case
// that it cannot be represented by a float itself.
//
// We must have that w * 10 ^q == (2m+1) * 2^p for some power of two 2^p.
// Recall that 10^q = 5^q * 2^q.
// When q >= 0, we must have that (2m+1) is divible by 5^q, so 5^q <= 2^54. We have that
// 5^23 <= 2^54 and it is the last power of five to qualify, so q <= 23.
// When q<0, we have w >= (2m+1) x 5^{-q}. We must have that w<2^{64} so
// (2m+1) x 5^{-q} < 2^{64}. We have that 2m+1>2^{53}. Hence, we must have
// 2^{53} x 5^{-q} < 2^{64}.
// Hence we have 5^{-q} < 2^{11}$ or q>= -4.
//
// We require lower <= 1 and not lower == 0 because we could not prove that
// that lower == 0 is implied; but we could prove that lower <= 1 is a necessary and sufficient test.
if (simdjson_unlikely((lower <= 1) && (power >= -4) && (power <= 23) && ((mantissa & 3) == 1))) {
if((mantissa << (upperbit + 64 - 53 - 2)) == upper) {
mantissa &= ~1; // flip it so that we do not round up
}
}
mantissa += mantissa & 1;
mantissa >>= 1;
// Here we have mantissa < (1<<53), unless there was an overflow
if (mantissa >= (1ULL << 53)) {
//////////
// This will happen when parsing values such as 7.2057594037927933e+16
////////
mantissa = (1ULL << 52);
real_exponent++;
}
mantissa &= ~(1ULL << 52);
// we have to check that real_exponent is in range, otherwise we bail out
if (simdjson_unlikely(real_exponent > 2046)) {
// We have an infinite value!!! We could actually throw an error here if we could.
return false;
}
d = to_double(mantissa, real_exponent, negative);
return true;
}
// We call a fallback floating-point parser that might be slow. Note
// it will accept JSON numbers, but the JSON spec. is more restrictive so
// before you call parse_float_fallback, you need to have validated the input
// string with the JSON grammar.
// It will return an error (false) if the parsed number is infinite.
// The string parsing itself always succeeds. We know that there is at least
// one digit.
static bool parse_float_fallback(const uint8_t *ptr, double *outDouble) {
*outDouble = simdjson::internal::from_chars(reinterpret_cast<const char *>(ptr));
// We do not accept infinite values.
// Detecting finite values in a portable manner is ridiculously hard, ideally
// we would want to do:
// return !std::isfinite(*outDouble);
// but that mysteriously fails under legacy/old libc++ libraries, see
// https://github.com/simdjson/simdjson/issues/1286
//
// Therefore, fall back to this solution (the extra parens are there
// to handle that max may be a macro on windows).
return !(*outDouble > (std::numeric_limits<double>::max)() || *outDouble < std::numeric_limits<double>::lowest());
}
static bool parse_float_fallback(const uint8_t *ptr, const uint8_t *end_ptr, double *outDouble) {
*outDouble = simdjson::internal::from_chars(reinterpret_cast<const char *>(ptr), reinterpret_cast<const char *>(end_ptr));
// We do not accept infinite values.
// Detecting finite values in a portable manner is ridiculously hard, ideally
// we would want to do:
// return !std::isfinite(*outDouble);
// but that mysteriously fails under legacy/old libc++ libraries, see
// https://github.com/simdjson/simdjson/issues/1286
//
// Therefore, fall back to this solution (the extra parens are there
// to handle that max may be a macro on windows).
return !(*outDouble > (std::numeric_limits<double>::max)() || *outDouble < std::numeric_limits<double>::lowest());
}
// check quickly whether the next 8 chars are made of digits
// at a glance, it looks better than Mula's
// http://0x80.pl/articles/swar-digits-validate.html
simdjson_inline bool is_made_of_eight_digits_fast(const uint8_t *chars) {
uint64_t val;
// this can read up to 7 bytes beyond the buffer size, but we require
// SIMDJSON_PADDING of padding
static_assert(7 <= SIMDJSON_PADDING, "SIMDJSON_PADDING must be bigger than 7");
std::memcpy(&val, chars, 8);
// a branchy method might be faster:
// return (( val & 0xF0F0F0F0F0F0F0F0 ) == 0x3030303030303030)
// && (( (val + 0x0606060606060606) & 0xF0F0F0F0F0F0F0F0 ) ==
// 0x3030303030303030);
return (((val & 0xF0F0F0F0F0F0F0F0) |
(((val + 0x0606060606060606) & 0xF0F0F0F0F0F0F0F0) >> 4)) ==
0x3333333333333333);
}
template<typename I>
SIMDJSON_NO_SANITIZE_UNDEFINED // We deliberately allow overflow here and check later
simdjson_inline bool parse_digit(const uint8_t c, I &i) {
const uint8_t digit = static_cast<uint8_t>(c - '0');
if (digit > 9) {
return false;
}
// PERF NOTE: multiplication by 10 is cheaper than arbitrary integer multiplication
i = 10 * i + digit; // might overflow, we will handle the overflow later
return true;
}
simdjson_inline bool is_digit(const uint8_t c) {
return static_cast<uint8_t>(c - '0') <= 9;
}
simdjson_inline error_code parse_decimal_after_separator(simdjson_unused const uint8_t *const src, const uint8_t *&p, uint64_t &i, int64_t &exponent) {
// we continue with the fiction that we have an integer. If the
// floating point number is representable as x * 10^z for some integer
// z that fits in 53 bits, then we will be able to convert back the
// the integer into a float in a lossless manner.
const uint8_t *const first_after_period = p;
#ifdef SIMDJSON_SWAR_NUMBER_PARSING
#if SIMDJSON_SWAR_NUMBER_PARSING
// this helps if we have lots of decimals!
// this turns out to be frequent enough.
if (is_made_of_eight_digits_fast(p)) {
i = i * 100000000 + parse_eight_digits_unrolled(p);
p += 8;
}
#endif // SIMDJSON_SWAR_NUMBER_PARSING
#endif // #ifdef SIMDJSON_SWAR_NUMBER_PARSING
// Unrolling the first digit makes a small difference on some implementations (e.g. westmere)
if (parse_digit(*p, i)) { ++p; }
while (parse_digit(*p, i)) { p++; }
exponent = first_after_period - p;
// Decimal without digits (123.) is illegal
if (exponent == 0) {
return INVALID_NUMBER(src);
}
return SUCCESS;
}
simdjson_inline error_code parse_exponent(simdjson_unused const uint8_t *const src, const uint8_t *&p, int64_t &exponent) {
// Exp Sign: -123.456e[-]78
bool neg_exp = ('-' == *p);
if (neg_exp || '+' == *p) { p++; } // Skip + as well
// Exponent: -123.456e-[78]
auto start_exp = p;
int64_t exp_number = 0;
while (parse_digit(*p, exp_number)) { ++p; }
// It is possible for parse_digit to overflow.
// In particular, it could overflow to INT64_MIN, and we cannot do - INT64_MIN.
// Thus we *must* check for possible overflow before we negate exp_number.
// Performance notes: it may seem like combining the two "simdjson_unlikely checks" below into
// a single simdjson_unlikely path would be faster. The reasoning is sound, but the compiler may
// not oblige and may, in fact, generate two distinct paths in any case. It might be
// possible to do uint64_t(p - start_exp - 1) >= 18 but it could end up trading off
// instructions for a simdjson_likely branch, an unconclusive gain.
// If there were no digits, it's an error.
if (simdjson_unlikely(p == start_exp)) {
return INVALID_NUMBER(src);
}
// We have a valid positive exponent in exp_number at this point, except that
// it may have overflowed.
// If there were more than 18 digits, we may have overflowed the integer. We have to do
// something!!!!
if (simdjson_unlikely(p > start_exp+18)) {
// Skip leading zeroes: 1e000000000000000000001 is technically valid and does not overflow
while (*start_exp == '0') { start_exp++; }
// 19 digits could overflow int64_t and is kind of absurd anyway. We don't
// support exponents smaller than -999,999,999,999,999,999 and bigger
// than 999,999,999,999,999,999.
// We can truncate.
// Note that 999999999999999999 is assuredly too large. The maximal ieee64 value before
// infinity is ~1.8e308. The smallest subnormal is ~5e-324. So, actually, we could
// truncate at 324.
// Note that there is no reason to fail per se at this point in time.
// E.g., 0e999999999999999999999 is a fine number.
if (p > start_exp+18) { exp_number = 999999999999999999; }
}
// At this point, we know that exp_number is a sane, positive, signed integer.
// It is <= 999,999,999,999,999,999. As long as 'exponent' is in
// [-8223372036854775808, 8223372036854775808], we won't overflow. Because 'exponent'
// is bounded in magnitude by the size of the JSON input, we are fine in this universe.
// To sum it up: the next line should never overflow.
exponent += (neg_exp ? -exp_number : exp_number);
return SUCCESS;
}
simdjson_inline bool check_if_integer(const uint8_t *const src, size_t max_length) {
const uint8_t *const srcend = src + max_length;
bool negative = (*src == '-'); // we can always read at least one character after the '-'
const uint8_t *p = src + uint8_t(negative);
if(p == srcend) { return false; }
if(*p == '0') {
++p;
if(p == srcend) { return true; }
if(jsoncharutils::is_not_structural_or_whitespace(*p)) { return false; }
return true;
}
while(p != srcend && is_digit(*p)) { ++p; }
if(p == srcend) { return true; }
if(jsoncharutils::is_not_structural_or_whitespace(*p)) { return false; }
return true;
}
simdjson_inline size_t significant_digits(const uint8_t * start_digits, size_t digit_count) {
// It is possible that the integer had an overflow.
// We have to handle the case where we have 0.0000somenumber.
const uint8_t *start = start_digits;
while ((*start == '0') || (*start == '.')) { ++start; }
// we over-decrement by one when there is a '.'
return digit_count - size_t(start - start_digits);
}
} // unnamed namespace
/** @private */
static error_code slow_float_parsing(simdjson_unused const uint8_t * src, double* answer) {
if (parse_float_fallback(src, answer)) {
return SUCCESS;
}
return INVALID_NUMBER(src);
}
/** @private */
template<typename W>
simdjson_inline error_code write_float(const uint8_t *const src, bool negative, uint64_t i, const uint8_t * start_digits, size_t digit_count, int64_t exponent, W &writer) {
// If we frequently had to deal with long strings of digits,
// we could extend our code by using a 128-bit integer instead
// of a 64-bit integer. However, this is uncommon in practice.
//
// 9999999999999999999 < 2**64 so we can accommodate 19 digits.
// If we have a decimal separator, then digit_count - 1 is the number of digits, but we
// may not have a decimal separator!
if (simdjson_unlikely(digit_count > 19 && significant_digits(start_digits, digit_count) > 19)) {
// Ok, chances are good that we had an overflow!
// this is almost never going to get called!!!
// we start anew, going slowly!!!
// This will happen in the following examples:
// 10000000000000000000000000000000000000000000e+308
// 3.1415926535897932384626433832795028841971693993751
//
// NOTE: We do not pass a reference to the to slow_float_parsing. If we passed our writer
// reference to it, it would force it to be stored in memory, preventing the compiler from
// picking it apart and putting into registers. i.e. if we pass it as reference,
// it gets slow.
double d;
error_code error = slow_float_parsing(src, &d);
writer.append_double(d);
return error;
}
// NOTE: it's weird that the simdjson_unlikely() only wraps half the if, but it seems to get slower any other
// way we've tried: https://github.com/simdjson/simdjson/pull/990#discussion_r448497331
// To future reader: we'd love if someone found a better way, or at least could explain this result!
if (simdjson_unlikely(exponent < simdjson::internal::smallest_power) || (exponent > simdjson::internal::largest_power)) {
//
// Important: smallest_power is such that it leads to a zero value.
// Observe that 18446744073709551615e-343 == 0, i.e. (2**64 - 1) e -343 is zero
// so something x 10^-343 goes to zero, but not so with something x 10^-342.
static_assert(simdjson::internal::smallest_power <= -342, "smallest_power is not small enough");
//
if((exponent < simdjson::internal::smallest_power) || (i == 0)) {
// E.g. Parse "-0.0e-999" into the same value as "-0.0". See https://en.wikipedia.org/wiki/Signed_zero
WRITE_DOUBLE(negative ? -0.0 : 0.0, src, writer);
return SUCCESS;
} else { // (exponent > largest_power) and (i != 0)
// We have, for sure, an infinite value and simdjson refuses to parse infinite values.
return INVALID_NUMBER(src);
}
}
double d;
if (!compute_float_64(exponent, i, negative, d)) {
// we are almost never going to get here.
if (!parse_float_fallback(src, &d)) { return INVALID_NUMBER(src); }
}
WRITE_DOUBLE(d, src, writer);
return SUCCESS;
}
// parse the number at src
// define JSON_TEST_NUMBERS for unit testing
//
// It is assumed that the number is followed by a structural ({,},],[) character
// or a white space character. If that is not the case (e.g., when the JSON
// document is made of a single number), then it is necessary to copy the
// content and append a space before calling this function.
//
// Our objective is accurate parsing (ULP of 0) at high speed.
template<typename W>
simdjson_inline error_code parse_number(const uint8_t *const src, W &writer);
// for performance analysis, it is sometimes useful to skip parsing
#ifdef SIMDJSON_SKIPNUMBERPARSING
template<typename W>
simdjson_inline error_code parse_number(const uint8_t *const, W &writer) {
writer.append_s64(0); // always write zero
return SUCCESS; // always succeeds
}
simdjson_unused simdjson_inline simdjson_result<uint64_t> parse_unsigned(const uint8_t * const src) noexcept { return 0; }
simdjson_unused simdjson_inline simdjson_result<int64_t> parse_integer(const uint8_t * const src) noexcept { return 0; }
simdjson_unused simdjson_inline simdjson_result<double> parse_double(const uint8_t * const src) noexcept { return 0; }
simdjson_unused simdjson_inline simdjson_result<uint64_t> parse_unsigned_in_string(const uint8_t * const src) noexcept { return 0; }
simdjson_unused simdjson_inline simdjson_result<int64_t> parse_integer_in_string(const uint8_t * const src) noexcept { return 0; }
simdjson_unused simdjson_inline simdjson_result<double> parse_double_in_string(const uint8_t * const src) noexcept { return 0; }
simdjson_unused simdjson_inline bool is_negative(const uint8_t * src) noexcept { return false; }
simdjson_unused simdjson_inline simdjson_result<bool> is_integer(const uint8_t * src) noexcept { return false; }
simdjson_unused simdjson_inline simdjson_result<number_type> get_number_type(const uint8_t * src) noexcept { return number_type::signed_integer; }
#else
// parse the number at src
// define JSON_TEST_NUMBERS for unit testing
//
// It is assumed that the number is followed by a structural ({,},],[) character
// or a white space character. If that is not the case (e.g., when the JSON
// document is made of a single number), then it is necessary to copy the
// content and append a space before calling this function.
//
// Our objective is accurate parsing (ULP of 0) at high speed.
template<typename W>
simdjson_inline error_code parse_number(const uint8_t *const src, W &writer) {
//
// Check for minus sign
//
bool negative = (*src == '-');
const uint8_t *p = src + uint8_t(negative);
//
// Parse the integer part.
//
// PERF NOTE: we don't use is_made_of_eight_digits_fast because large integers like 123456789 are rare
const uint8_t *const start_digits = p;
uint64_t i = 0;
while (parse_digit(*p, i)) { p++; }
// If there were no digits, or if the integer starts with 0 and has more than one digit, it's an error.
// Optimization note: size_t is expected to be unsigned.
size_t digit_count = size_t(p - start_digits);
if (digit_count == 0 || ('0' == *start_digits && digit_count > 1)) { return INVALID_NUMBER(src); }
//
// Handle floats if there is a . or e (or both)
//
int64_t exponent = 0;
bool is_float = false;
if ('.' == *p) {
is_float = true;
++p;
SIMDJSON_TRY( parse_decimal_after_separator(src, p, i, exponent) );
digit_count = int(p - start_digits); // used later to guard against overflows
}
if (('e' == *p) || ('E' == *p)) {
is_float = true;
++p;
SIMDJSON_TRY( parse_exponent(src, p, exponent) );
}
if (is_float) {
const bool dirty_end = jsoncharutils::is_not_structural_or_whitespace(*p);
SIMDJSON_TRY( write_float(src, negative, i, start_digits, digit_count, exponent, writer) );
if (dirty_end) { return INVALID_NUMBER(src); }
return SUCCESS;
}
// The longest negative 64-bit number is 19 digits.
// The longest positive 64-bit number is 20 digits.
// We do it this way so we don't trigger this branch unless we must.
size_t longest_digit_count = negative ? 19 : 20;
if (digit_count > longest_digit_count) { return BIGINT_NUMBER(src); }
if (digit_count == longest_digit_count) {
if (negative) {
// Anything negative above INT64_MAX+1 is invalid
if (i > uint64_t(INT64_MAX)+1) { return BIGINT_NUMBER(src); }
WRITE_INTEGER(~i+1, src, writer);
if (jsoncharutils::is_not_structural_or_whitespace(*p)) { return INVALID_NUMBER(src); }
return SUCCESS;
// Positive overflow check:
// - A 20 digit number starting with 2-9 is overflow, because 18,446,744,073,709,551,615 is the
// biggest uint64_t.
// - A 20 digit number starting with 1 is overflow if it is less than INT64_MAX.
// If we got here, it's a 20 digit number starting with the digit "1".
// - If a 20 digit number starting with 1 overflowed (i*10+digit), the result will be smaller
// than 1,553,255,926,290,448,384.
// - That is smaller than the smallest possible 20-digit number the user could write:
// 10,000,000,000,000,000,000.
// - Therefore, if the number is positive and lower than that, it's overflow.
// - The value we are looking at is less than or equal to INT64_MAX.
//
} else if (src[0] != uint8_t('1') || i <= uint64_t(INT64_MAX)) { return INVALID_NUMBER(src); }
}
// Write unsigned if it does not fit in a signed integer.
if (i > uint64_t(INT64_MAX)) {
WRITE_UNSIGNED(i, src, writer);
} else {
WRITE_INTEGER(negative ? (~i+1) : i, src, writer);
}
if (jsoncharutils::is_not_structural_or_whitespace(*p)) { return INVALID_NUMBER(src); }
return SUCCESS;
}
// Inlineable functions
namespace {
// This table can be used to characterize the final character of an integer
// string. For JSON structural character and allowable white space characters,
// we return SUCCESS. For 'e', '.' and 'E', we return INCORRECT_TYPE. Otherwise
// we return NUMBER_ERROR.
// Optimization note: we could easily reduce the size of the table by half (to 128)
// at the cost of an extra branch.
// Optimization note: we want the values to use at most 8 bits (not, e.g., 32 bits):
static_assert(error_code(uint8_t(NUMBER_ERROR))== NUMBER_ERROR, "bad NUMBER_ERROR cast");
static_assert(error_code(uint8_t(SUCCESS))== SUCCESS, "bad NUMBER_ERROR cast");
static_assert(error_code(uint8_t(INCORRECT_TYPE))== INCORRECT_TYPE, "bad NUMBER_ERROR cast");
const uint8_t integer_string_finisher[256] = {
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, SUCCESS,
SUCCESS, NUMBER_ERROR, NUMBER_ERROR, SUCCESS, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, SUCCESS, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, SUCCESS,
NUMBER_ERROR, INCORRECT_TYPE, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, SUCCESS, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, INCORRECT_TYPE,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, SUCCESS, NUMBER_ERROR, SUCCESS, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, INCORRECT_TYPE, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, SUCCESS, NUMBER_ERROR,
SUCCESS, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR};
// Parse any number from 0 to 18,446,744,073,709,551,615
simdjson_unused simdjson_inline simdjson_result<uint64_t> parse_unsigned(const uint8_t * const src) noexcept {
const uint8_t *p = src;
//
// Parse the integer part.
//
// PERF NOTE: we don't use is_made_of_eight_digits_fast because large integers like 123456789 are rare
const uint8_t *const start_digits = p;
uint64_t i = 0;
while (parse_digit(*p, i)) { p++; }
// If there were no digits, or if the integer starts with 0 and has more than one digit, it's an error.
// Optimization note: size_t is expected to be unsigned.
size_t digit_count = size_t(p - start_digits);
// The longest positive 64-bit number is 20 digits.
// We do it this way so we don't trigger this branch unless we must.
// Optimization note: the compiler can probably merge
// ((digit_count == 0) || (digit_count > 20))
// into a single branch since digit_count is unsigned.
if ((digit_count == 0) || (digit_count > 20)) { return INCORRECT_TYPE; }
// Here digit_count > 0.
if (('0' == *start_digits) && (digit_count > 1)) { return NUMBER_ERROR; }
// We can do the following...
// if (!jsoncharutils::is_structural_or_whitespace(*p)) {
// return (*p == '.' || *p == 'e' || *p == 'E') ? INCORRECT_TYPE : NUMBER_ERROR;
// }
// as a single table lookup:
if (integer_string_finisher[*p] != SUCCESS) { return error_code(integer_string_finisher[*p]); }
if (digit_count == 20) {
// Positive overflow check:
// - A 20 digit number starting with 2-9 is overflow, because 18,446,744,073,709,551,615 is the
// biggest uint64_t.
// - A 20 digit number starting with 1 is overflow if it is less than INT64_MAX.
// If we got here, it's a 20 digit number starting with the digit "1".
// - If a 20 digit number starting with 1 overflowed (i*10+digit), the result will be smaller
// than 1,553,255,926,290,448,384.
// - That is smaller than the smallest possible 20-digit number the user could write:
// 10,000,000,000,000,000,000.
// - Therefore, if the number is positive and lower than that, it's overflow.
// - The value we are looking at is less than or equal to INT64_MAX.
//
if (src[0] != uint8_t('1') || i <= uint64_t(INT64_MAX)) { return INCORRECT_TYPE; }
}
return i;
}
// Parse any number from 0 to 18,446,744,073,709,551,615
// Never read at src_end or beyond
simdjson_unused simdjson_inline simdjson_result<uint64_t> parse_unsigned(const uint8_t * const src, const uint8_t * const src_end) noexcept {
const uint8_t *p = src;
//
// Parse the integer part.
//
// PERF NOTE: we don't use is_made_of_eight_digits_fast because large integers like 123456789 are rare
const uint8_t *const start_digits = p;
uint64_t i = 0;
while ((p != src_end) && parse_digit(*p, i)) { p++; }
// If there were no digits, or if the integer starts with 0 and has more than one digit, it's an error.
// Optimization note: size_t is expected to be unsigned.
size_t digit_count = size_t(p - start_digits);
// The longest positive 64-bit number is 20 digits.
// We do it this way so we don't trigger this branch unless we must.
// Optimization note: the compiler can probably merge
// ((digit_count == 0) || (digit_count > 20))
// into a single branch since digit_count is unsigned.
if ((digit_count == 0) || (digit_count > 20)) { return INCORRECT_TYPE; }
// Here digit_count > 0.
if (('0' == *start_digits) && (digit_count > 1)) { return NUMBER_ERROR; }
// We can do the following...
// if (!jsoncharutils::is_structural_or_whitespace(*p)) {
// return (*p == '.' || *p == 'e' || *p == 'E') ? INCORRECT_TYPE : NUMBER_ERROR;
// }
// as a single table lookup:
if ((p != src_end) && integer_string_finisher[*p] != SUCCESS) { return error_code(integer_string_finisher[*p]); }
if (digit_count == 20) {
// Positive overflow check:
// - A 20 digit number starting with 2-9 is overflow, because 18,446,744,073,709,551,615 is the
// biggest uint64_t.
// - A 20 digit number starting with 1 is overflow if it is less than INT64_MAX.
// If we got here, it's a 20 digit number starting with the digit "1".
// - If a 20 digit number starting with 1 overflowed (i*10+digit), the result will be smaller
// than 1,553,255,926,290,448,384.
// - That is smaller than the smallest possible 20-digit number the user could write:
// 10,000,000,000,000,000,000.
// - Therefore, if the number is positive and lower than that, it's overflow.
// - The value we are looking at is less than or equal to INT64_MAX.
//
if (src[0] != uint8_t('1') || i <= uint64_t(INT64_MAX)) { return INCORRECT_TYPE; }
}
return i;
}
// Parse any number from 0 to 18,446,744,073,709,551,615
simdjson_unused simdjson_inline simdjson_result<uint64_t> parse_unsigned_in_string(const uint8_t * const src) noexcept {
const uint8_t *p = src + 1;
//
// Parse the integer part.
//
// PERF NOTE: we don't use is_made_of_eight_digits_fast because large integers like 123456789 are rare
const uint8_t *const start_digits = p;
uint64_t i = 0;
while (parse_digit(*p, i)) { p++; }
// If there were no digits, or if the integer starts with 0 and has more than one digit, it's an error.
// Optimization note: size_t is expected to be unsigned.
size_t digit_count = size_t(p - start_digits);
// The longest positive 64-bit number is 20 digits.
// We do it this way so we don't trigger this branch unless we must.
// Optimization note: the compiler can probably merge
// ((digit_count == 0) || (digit_count > 20))
// into a single branch since digit_count is unsigned.
if ((digit_count == 0) || (digit_count > 20)) { return INCORRECT_TYPE; }
// Here digit_count > 0.
if (('0' == *start_digits) && (digit_count > 1)) { return NUMBER_ERROR; }
// We can do the following...
// if (!jsoncharutils::is_structural_or_whitespace(*p)) {
// return (*p == '.' || *p == 'e' || *p == 'E') ? INCORRECT_TYPE : NUMBER_ERROR;
// }
// as a single table lookup:
if (*p != '"') { return NUMBER_ERROR; }
if (digit_count == 20) {
// Positive overflow check:
// - A 20 digit number starting with 2-9 is overflow, because 18,446,744,073,709,551,615 is the
// biggest uint64_t.
// - A 20 digit number starting with 1 is overflow if it is less than INT64_MAX.
// If we got here, it's a 20 digit number starting with the digit "1".
// - If a 20 digit number starting with 1 overflowed (i*10+digit), the result will be smaller
// than 1,553,255,926,290,448,384.
// - That is smaller than the smallest possible 20-digit number the user could write:
// 10,000,000,000,000,000,000.
// - Therefore, if the number is positive and lower than that, it's overflow.
// - The value we are looking at is less than or equal to INT64_MAX.
//
// Note: we use src[1] and not src[0] because src[0] is the quote character in this
// instance.
if (src[1] != uint8_t('1') || i <= uint64_t(INT64_MAX)) { return INCORRECT_TYPE; }
}
return i;
}
// Parse any number from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
simdjson_unused simdjson_inline simdjson_result<int64_t> parse_integer(const uint8_t *src) noexcept {
//
// Check for minus sign
//
bool negative = (*src == '-');
const uint8_t *p = src + uint8_t(negative);
//
// Parse the integer part.
//
// PERF NOTE: we don't use is_made_of_eight_digits_fast because large integers like 123456789 are rare
const uint8_t *const start_digits = p;
uint64_t i = 0;
while (parse_digit(*p, i)) { p++; }
// If there were no digits, or if the integer starts with 0 and has more than one digit, it's an error.
// Optimization note: size_t is expected to be unsigned.
size_t digit_count = size_t(p - start_digits);
// We go from
// -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
// so we can never represent numbers that have more than 19 digits.
size_t longest_digit_count = 19;
// Optimization note: the compiler can probably merge
// ((digit_count == 0) || (digit_count > longest_digit_count))
// into a single branch since digit_count is unsigned.
if ((digit_count == 0) || (digit_count > longest_digit_count)) { return INCORRECT_TYPE; }
// Here digit_count > 0.
if (('0' == *start_digits) && (digit_count > 1)) { return NUMBER_ERROR; }
// We can do the following...
// if (!jsoncharutils::is_structural_or_whitespace(*p)) {
// return (*p == '.' || *p == 'e' || *p == 'E') ? INCORRECT_TYPE : NUMBER_ERROR;
// }
// as a single table lookup:
if(integer_string_finisher[*p] != SUCCESS) { return error_code(integer_string_finisher[*p]); }
// Negative numbers have can go down to - INT64_MAX - 1 whereas positive numbers are limited to INT64_MAX.
// Performance note: This check is only needed when digit_count == longest_digit_count but it is
// so cheap that we might as well always make it.
if(i > uint64_t(INT64_MAX) + uint64_t(negative)) { return INCORRECT_TYPE; }
return negative ? (~i+1) : i;
}
// Parse any number from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
// Never read at src_end or beyond
simdjson_unused simdjson_inline simdjson_result<int64_t> parse_integer(const uint8_t * const src, const uint8_t * const src_end) noexcept {
//
// Check for minus sign
//
if(src == src_end) { return NUMBER_ERROR; }
bool negative = (*src == '-');
const uint8_t *p = src + uint8_t(negative);
//
// Parse the integer part.
//
// PERF NOTE: we don't use is_made_of_eight_digits_fast because large integers like 123456789 are rare
const uint8_t *const start_digits = p;
uint64_t i = 0;
while ((p != src_end) && parse_digit(*p, i)) { p++; }
// If there were no digits, or if the integer starts with 0 and has more than one digit, it's an error.
// Optimization note: size_t is expected to be unsigned.
size_t digit_count = size_t(p - start_digits);
// We go from
// -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
// so we can never represent numbers that have more than 19 digits.
size_t longest_digit_count = 19;
// Optimization note: the compiler can probably merge
// ((digit_count == 0) || (digit_count > longest_digit_count))
// into a single branch since digit_count is unsigned.
if ((digit_count == 0) || (digit_count > longest_digit_count)) { return INCORRECT_TYPE; }
// Here digit_count > 0.
if (('0' == *start_digits) && (digit_count > 1)) { return NUMBER_ERROR; }
// We can do the following...
// if (!jsoncharutils::is_structural_or_whitespace(*p)) {
// return (*p == '.' || *p == 'e' || *p == 'E') ? INCORRECT_TYPE : NUMBER_ERROR;
// }
// as a single table lookup:
if((p != src_end) && integer_string_finisher[*p] != SUCCESS) { return error_code(integer_string_finisher[*p]); }
// Negative numbers have can go down to - INT64_MAX - 1 whereas positive numbers are limited to INT64_MAX.
// Performance note: This check is only needed when digit_count == longest_digit_count but it is
// so cheap that we might as well always make it.
if(i > uint64_t(INT64_MAX) + uint64_t(negative)) { return INCORRECT_TYPE; }
return negative ? (~i+1) : i;
}
// Parse any number from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
simdjson_unused simdjson_inline simdjson_result<int64_t> parse_integer_in_string(const uint8_t *src) noexcept {
//
// Check for minus sign
//
bool negative = (*(src + 1) == '-');
src += uint8_t(negative) + 1;
//
// Parse the integer part.
//
// PERF NOTE: we don't use is_made_of_eight_digits_fast because large integers like 123456789 are rare
const uint8_t *const start_digits = src;
uint64_t i = 0;
while (parse_digit(*src, i)) { src++; }
// If there were no digits, or if the integer starts with 0 and has more than one digit, it's an error.
// Optimization note: size_t is expected to be unsigned.
size_t digit_count = size_t(src - start_digits);
// We go from
// -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
// so we can never represent numbers that have more than 19 digits.
size_t longest_digit_count = 19;
// Optimization note: the compiler can probably merge
// ((digit_count == 0) || (digit_count > longest_digit_count))
// into a single branch since digit_count is unsigned.
if ((digit_count == 0) || (digit_count > longest_digit_count)) { return INCORRECT_TYPE; }
// Here digit_count > 0.
if (('0' == *start_digits) && (digit_count > 1)) { return NUMBER_ERROR; }
// We can do the following...
// if (!jsoncharutils::is_structural_or_whitespace(*src)) {
// return (*src == '.' || *src == 'e' || *src == 'E') ? INCORRECT_TYPE : NUMBER_ERROR;
// }
// as a single table lookup:
if(*src != '"') { return NUMBER_ERROR; }
// Negative numbers have can go down to - INT64_MAX - 1 whereas positive numbers are limited to INT64_MAX.
// Performance note: This check is only needed when digit_count == longest_digit_count but it is
// so cheap that we might as well always make it.
if(i > uint64_t(INT64_MAX) + uint64_t(negative)) { return INCORRECT_TYPE; }
return negative ? (~i+1) : i;
}
simdjson_unused simdjson_inline simdjson_result<double> parse_double(const uint8_t * src) noexcept {
//
// Check for minus sign
//
bool negative = (*src == '-');
src += uint8_t(negative);
//
// Parse the integer part.
//
uint64_t i = 0;
const uint8_t *p = src;
p += parse_digit(*p, i);
bool leading_zero = (i == 0);
while (parse_digit(*p, i)) { p++; }
// no integer digits, or 0123 (zero must be solo)
if ( p == src ) { return INCORRECT_TYPE; }
if ( (leading_zero && p != src+1)) { return NUMBER_ERROR; }
//
// Parse the decimal part.
//
int64_t exponent = 0;
bool overflow;
if (simdjson_likely(*p == '.')) {
p++;
const uint8_t *start_decimal_digits = p;
if (!parse_digit(*p, i)) { return NUMBER_ERROR; } // no decimal digits
p++;
while (parse_digit(*p, i)) { p++; }
exponent = -(p - start_decimal_digits);
// Overflow check. More than 19 digits (minus the decimal) may be overflow.
overflow = p-src-1 > 19;
if (simdjson_unlikely(overflow && leading_zero)) {
// Skip leading 0.00000 and see if it still overflows
const uint8_t *start_digits = src + 2;
while (*start_digits == '0') { start_digits++; }
overflow = p-start_digits > 19;
}
} else {
overflow = p-src > 19;
}
//
// Parse the exponent
//
if (*p == 'e' || *p == 'E') {
p++;
bool exp_neg = *p == '-';
p += exp_neg || *p == '+';
uint64_t exp = 0;
const uint8_t *start_exp_digits = p;
while (parse_digit(*p, exp)) { p++; }
// no exp digits, or 20+ exp digits
if (p-start_exp_digits == 0 || p-start_exp_digits > 19) { return NUMBER_ERROR; }
exponent += exp_neg ? 0-exp : exp;
}
if (jsoncharutils::is_not_structural_or_whitespace(*p)) { return NUMBER_ERROR; }
overflow = overflow || exponent < simdjson::internal::smallest_power || exponent > simdjson::internal::largest_power;
//
// Assemble (or slow-parse) the float
//
double d;
if (simdjson_likely(!overflow)) {
if (compute_float_64(exponent, i, negative, d)) { return d; }
}
if (!parse_float_fallback(src - uint8_t(negative), &d)) {
return NUMBER_ERROR;
}
return d;
}
simdjson_unused simdjson_inline bool is_negative(const uint8_t * src) noexcept {
return (*src == '-');
}
simdjson_unused simdjson_inline simdjson_result<bool> is_integer(const uint8_t * src) noexcept {
bool negative = (*src == '-');
src += uint8_t(negative);
const uint8_t *p = src;
while(static_cast<uint8_t>(*p - '0') <= 9) { p++; }
if ( p == src ) { return NUMBER_ERROR; }
if (jsoncharutils::is_structural_or_whitespace(*p)) { return true; }
return false;
}
simdjson_unused simdjson_inline simdjson_result<number_type> get_number_type(const uint8_t * src) noexcept {
bool negative = (*src == '-');
src += uint8_t(negative);
const uint8_t *p = src;
while(static_cast<uint8_t>(*p - '0') <= 9) { p++; }
size_t digit_count = size_t(p - src);
if ( p == src ) { return NUMBER_ERROR; }
if (jsoncharutils::is_structural_or_whitespace(*p)) {
static const uint8_t * smaller_big_integer = reinterpret_cast<const uint8_t *>("9223372036854775808");
// We have an integer.
if(simdjson_unlikely(digit_count > 20)) {
return number_type::big_integer;
}
// If the number is negative and valid, it must be a signed integer.
if(negative) {
if (simdjson_unlikely(digit_count > 19)) return number_type::big_integer;
if (simdjson_unlikely(digit_count == 19 && memcmp(src, smaller_big_integer, 19) > 0)) {
return number_type::big_integer;
}
return number_type::signed_integer;
}
// Let us check if we have a big integer (>=2**64).
static const uint8_t * two_to_sixtyfour = reinterpret_cast<const uint8_t *>("18446744073709551616");
if((digit_count > 20) || (digit_count == 20 && memcmp(src, two_to_sixtyfour, 20) >= 0)) {
return number_type::big_integer;
}
// The number is positive and smaller than 18446744073709551616 (or 2**64).
// We want values larger or equal to 9223372036854775808 to be unsigned
// integers, and the other values to be signed integers.
if((digit_count == 20) || (digit_count >= 19 && memcmp(src, smaller_big_integer, 19) >= 0)) {
return number_type::unsigned_integer;
}
return number_type::signed_integer;
}
// Hopefully, we have 'e' or 'E' or '.'.
return number_type::floating_point_number;
}
// Never read at src_end or beyond
simdjson_unused simdjson_inline simdjson_result<double> parse_double(const uint8_t * src, const uint8_t * const src_end) noexcept {
if(src == src_end) { return NUMBER_ERROR; }
//
// Check for minus sign
//
bool negative = (*src == '-');
src += uint8_t(negative);
//
// Parse the integer part.
//
uint64_t i = 0;
const uint8_t *p = src;
if(p == src_end) { return NUMBER_ERROR; }
p += parse_digit(*p, i);
bool leading_zero = (i == 0);
while ((p != src_end) && parse_digit(*p, i)) { p++; }
// no integer digits, or 0123 (zero must be solo)
if ( p == src ) { return INCORRECT_TYPE; }
if ( (leading_zero && p != src+1)) { return NUMBER_ERROR; }
//
// Parse the decimal part.
//
int64_t exponent = 0;
bool overflow;
if (simdjson_likely((p != src_end) && (*p == '.'))) {
p++;
const uint8_t *start_decimal_digits = p;
if ((p == src_end) || !parse_digit(*p, i)) { return NUMBER_ERROR; } // no decimal digits
p++;
while ((p != src_end) && parse_digit(*p, i)) { p++; }
exponent = -(p - start_decimal_digits);
// Overflow check. More than 19 digits (minus the decimal) may be overflow.
overflow = p-src-1 > 19;
if (simdjson_unlikely(overflow && leading_zero)) {
// Skip leading 0.00000 and see if it still overflows
const uint8_t *start_digits = src + 2;
while (*start_digits == '0') { start_digits++; }
overflow = start_digits-src > 19;
}
} else {
overflow = p-src > 19;
}
//
// Parse the exponent
//
if ((p != src_end) && (*p == 'e' || *p == 'E')) {
p++;
if(p == src_end) { return NUMBER_ERROR; }
bool exp_neg = *p == '-';
p += exp_neg || *p == '+';
uint64_t exp = 0;
const uint8_t *start_exp_digits = p;
while ((p != src_end) && parse_digit(*p, exp)) { p++; }
// no exp digits, or 20+ exp digits
if (p-start_exp_digits == 0 || p-start_exp_digits > 19) { return NUMBER_ERROR; }
exponent += exp_neg ? 0-exp : exp;
}
if ((p != src_end) && jsoncharutils::is_not_structural_or_whitespace(*p)) { return NUMBER_ERROR; }
overflow = overflow || exponent < simdjson::internal::smallest_power || exponent > simdjson::internal::largest_power;
//
// Assemble (or slow-parse) the float
//
double d;
if (simdjson_likely(!overflow)) {
if (compute_float_64(exponent, i, negative, d)) { return d; }
}
if (!parse_float_fallback(src - uint8_t(negative), src_end, &d)) {
return NUMBER_ERROR;
}
return d;
}
simdjson_unused simdjson_inline simdjson_result<double> parse_double_in_string(const uint8_t * src) noexcept {
//
// Check for minus sign
//
bool negative = (*(src + 1) == '-');
src += uint8_t(negative) + 1;
//
// Parse the integer part.
//
uint64_t i = 0;
const uint8_t *p = src;
p += parse_digit(*p, i);
bool leading_zero = (i == 0);
while (parse_digit(*p, i)) { p++; }
// no integer digits, or 0123 (zero must be solo)
if ( p == src ) { return INCORRECT_TYPE; }
if ( (leading_zero && p != src+1)) { return NUMBER_ERROR; }
//
// Parse the decimal part.
//
int64_t exponent = 0;
bool overflow;
if (simdjson_likely(*p == '.')) {
p++;
const uint8_t *start_decimal_digits = p;
if (!parse_digit(*p, i)) { return NUMBER_ERROR; } // no decimal digits
p++;
while (parse_digit(*p, i)) { p++; }
exponent = -(p - start_decimal_digits);
// Overflow check. More than 19 digits (minus the decimal) may be overflow.
overflow = p-src-1 > 19;
if (simdjson_unlikely(overflow && leading_zero)) {
// Skip leading 0.00000 and see if it still overflows
const uint8_t *start_digits = src + 2;
while (*start_digits == '0') { start_digits++; }
overflow = p-start_digits > 19;
}
} else {
overflow = p-src > 19;
}
//
// Parse the exponent
//
if (*p == 'e' || *p == 'E') {
p++;
bool exp_neg = *p == '-';
p += exp_neg || *p == '+';
uint64_t exp = 0;
const uint8_t *start_exp_digits = p;
while (parse_digit(*p, exp)) { p++; }
// no exp digits, or 20+ exp digits
if (p-start_exp_digits == 0 || p-start_exp_digits > 19) { return NUMBER_ERROR; }
exponent += exp_neg ? 0-exp : exp;
}
if (*p != '"') { return NUMBER_ERROR; }
overflow = overflow || exponent < simdjson::internal::smallest_power || exponent > simdjson::internal::largest_power;
//
// Assemble (or slow-parse) the float
//
double d;
if (simdjson_likely(!overflow)) {
if (compute_float_64(exponent, i, negative, d)) { return d; }
}
if (!parse_float_fallback(src - uint8_t(negative), &d)) {
return NUMBER_ERROR;
}
return d;
}
} // unnamed namespace
#endif // SIMDJSON_SKIPNUMBERPARSING
} // namespace numberparsing
inline std::ostream& operator<<(std::ostream& out, number_type type) noexcept {
switch (type) {
case number_type::signed_integer: out << "integer in [-9223372036854775808,9223372036854775808)"; break;
case number_type::unsigned_integer: out << "unsigned integer in [9223372036854775808,18446744073709551616)"; break;
case number_type::floating_point_number: out << "floating-point number (binary64)"; break;
case number_type::big_integer: out << "big integer"; break;
default: SIMDJSON_UNREACHABLE();
}
return out;
}
} // namespace arm64
} // namespace simdjson
#endif // SIMDJSON_GENERIC_NUMBERPARSING_H
/* end file simdjson/generic/numberparsing.h for arm64 */
/* including simdjson/generic/implementation_simdjson_result_base-inl.h for arm64: #include "simdjson/generic/implementation_simdjson_result_base-inl.h" */
/* begin file simdjson/generic/implementation_simdjson_result_base-inl.h for arm64 */
#ifndef SIMDJSON_GENERIC_IMPLEMENTATION_SIMDJSON_RESULT_BASE_INL_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_GENERIC_IMPLEMENTATION_SIMDJSON_RESULT_BASE_INL_H */
/* amalgamation skipped (editor-only): #include "simdjson/generic/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/generic/implementation_simdjson_result_base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace arm64 {
//
// internal::implementation_simdjson_result_base<T> inline implementation
//
template<typename T>
simdjson_inline void implementation_simdjson_result_base<T>::tie(T &value, error_code &error) && noexcept {
error = this->second;
if (!error) {
value = std::forward<implementation_simdjson_result_base<T>>(*this).first;
}
}
template<typename T>
simdjson_warn_unused simdjson_inline error_code implementation_simdjson_result_base<T>::get(T &value) && noexcept {
error_code error;
std::forward<implementation_simdjson_result_base<T>>(*this).tie(value, error);
return error;
}
template<typename T>
simdjson_inline error_code implementation_simdjson_result_base<T>::error() const noexcept {
return this->second;
}
#if SIMDJSON_EXCEPTIONS
template<typename T>
simdjson_inline T& implementation_simdjson_result_base<T>::value() & noexcept(false) {
if (error()) { throw simdjson_error(error()); }
return this->first;
}
template<typename T>
simdjson_inline T&& implementation_simdjson_result_base<T>::value() && noexcept(false) {
return std::forward<implementation_simdjson_result_base<T>>(*this).take_value();
}
template<typename T>
simdjson_inline T&& implementation_simdjson_result_base<T>::take_value() && noexcept(false) {
if (error()) { throw simdjson_error(error()); }
return std::forward<T>(this->first);
}
template<typename T>
simdjson_inline implementation_simdjson_result_base<T>::operator T&&() && noexcept(false) {
return std::forward<implementation_simdjson_result_base<T>>(*this).take_value();
}
#endif // SIMDJSON_EXCEPTIONS
template<typename T>
simdjson_inline const T& implementation_simdjson_result_base<T>::value_unsafe() const& noexcept {
return this->first;
}
template<typename T>
simdjson_inline T& implementation_simdjson_result_base<T>::value_unsafe() & noexcept {
return this->first;
}
template<typename T>
simdjson_inline T&& implementation_simdjson_result_base<T>::value_unsafe() && noexcept {
return std::forward<T>(this->first);
}
template<typename T>
simdjson_inline implementation_simdjson_result_base<T>::implementation_simdjson_result_base(T &&value, error_code error) noexcept
: first{std::forward<T>(value)}, second{error} {}
template<typename T>
simdjson_inline implementation_simdjson_result_base<T>::implementation_simdjson_result_base(error_code error) noexcept
: implementation_simdjson_result_base(T{}, error) {}
template<typename T>
simdjson_inline implementation_simdjson_result_base<T>::implementation_simdjson_result_base(T &&value) noexcept
: implementation_simdjson_result_base(std::forward<T>(value), SUCCESS) {}
} // namespace arm64
} // namespace simdjson
#endif // SIMDJSON_GENERIC_IMPLEMENTATION_SIMDJSON_RESULT_BASE_INL_H
/* end file simdjson/generic/implementation_simdjson_result_base-inl.h for arm64 */
/* end file simdjson/generic/amalgamated.h for arm64 */
/* including simdjson/arm64/end.h: #include "simdjson/arm64/end.h" */
/* begin file simdjson/arm64/end.h */
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/arm64/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#undef SIMDJSON_SKIP_BACKSLASH_SHORT_CIRCUIT
/* undefining SIMDJSON_IMPLEMENTATION from "arm64" */
#undef SIMDJSON_IMPLEMENTATION
/* end file simdjson/arm64/end.h */
#endif // SIMDJSON_ARM64_H
/* end file simdjson/arm64.h */
/* including simdjson/arm64/implementation.h: #include <simdjson/arm64/implementation.h> */
/* begin file simdjson/arm64/implementation.h */
#ifndef SIMDJSON_ARM64_IMPLEMENTATION_H
#define SIMDJSON_ARM64_IMPLEMENTATION_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/implementation.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/instruction_set.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace arm64 {
/**
* @private
*/
class implementation final : public simdjson::implementation {
public:
simdjson_inline implementation() : simdjson::implementation("arm64", "ARM NEON", internal::instruction_set::NEON) {}
simdjson_warn_unused error_code create_dom_parser_implementation(
size_t capacity,
size_t max_length,
std::unique_ptr<internal::dom_parser_implementation>& dst
) const noexcept final;
simdjson_warn_unused error_code minify(const uint8_t *buf, size_t len, uint8_t *dst, size_t &dst_len) const noexcept final;
simdjson_warn_unused bool validate_utf8(const char *buf, size_t len) const noexcept final;
};
} // namespace arm64
} // namespace simdjson
#endif // SIMDJSON_ARM64_IMPLEMENTATION_H
/* end file simdjson/arm64/implementation.h */
/* including simdjson/arm64/begin.h: #include <simdjson/arm64/begin.h> */
/* begin file simdjson/arm64/begin.h */
/* defining SIMDJSON_IMPLEMENTATION to "arm64" */
#define SIMDJSON_IMPLEMENTATION arm64
/* including simdjson/arm64/base.h: #include "simdjson/arm64/base.h" */
/* begin file simdjson/arm64/base.h */
#ifndef SIMDJSON_ARM64_BASE_H
#define SIMDJSON_ARM64_BASE_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
/**
* Implementation for NEON (ARMv8).
*/
namespace arm64 {
class implementation;
namespace {
namespace simd {
template <typename T> struct simd8;
template <typename T> struct simd8x64;
} // namespace simd
} // unnamed namespace
} // namespace arm64
} // namespace simdjson
#endif // SIMDJSON_ARM64_BASE_H
/* end file simdjson/arm64/base.h */
/* including simdjson/arm64/intrinsics.h: #include "simdjson/arm64/intrinsics.h" */
/* begin file simdjson/arm64/intrinsics.h */
#ifndef SIMDJSON_ARM64_INTRINSICS_H
#define SIMDJSON_ARM64_INTRINSICS_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/arm64/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
// This should be the correct header whether
// you use visual studio or other compilers.
#include <arm_neon.h>
static_assert(sizeof(uint8x16_t) <= simdjson::SIMDJSON_PADDING, "insufficient padding for arm64");
#endif // SIMDJSON_ARM64_INTRINSICS_H
/* end file simdjson/arm64/intrinsics.h */
/* including simdjson/arm64/bitmanipulation.h: #include "simdjson/arm64/bitmanipulation.h" */
/* begin file simdjson/arm64/bitmanipulation.h */
#ifndef SIMDJSON_ARM64_BITMANIPULATION_H
#define SIMDJSON_ARM64_BITMANIPULATION_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/arm64/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/arm64/intrinsics.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace arm64 {
namespace {
// We sometimes call trailing_zero on inputs that are zero,
// but the algorithms do not end up using the returned value.
// Sadly, sanitizers are not smart enough to figure it out.
SIMDJSON_NO_SANITIZE_UNDEFINED
// This function can be used safely even if not all bytes have been
// initialized.
// See issue https://github.com/simdjson/simdjson/issues/1965
SIMDJSON_NO_SANITIZE_MEMORY
simdjson_inline int trailing_zeroes(uint64_t input_num) {
#ifdef SIMDJSON_REGULAR_VISUAL_STUDIO
unsigned long ret;
// Search the mask data from least significant bit (LSB)
// to the most significant bit (MSB) for a set bit (1).
_BitScanForward64(&ret, input_num);
return (int)ret;
#else // SIMDJSON_REGULAR_VISUAL_STUDIO
return __builtin_ctzll(input_num);
#endif // SIMDJSON_REGULAR_VISUAL_STUDIO
}
/* result might be undefined when input_num is zero */
simdjson_inline uint64_t clear_lowest_bit(uint64_t input_num) {
return input_num & (input_num-1);
}
/* result might be undefined when input_num is zero */
simdjson_inline int leading_zeroes(uint64_t input_num) {
#ifdef SIMDJSON_REGULAR_VISUAL_STUDIO
unsigned long leading_zero = 0;
// Search the mask data from most significant bit (MSB)
// to least significant bit (LSB) for a set bit (1).
if (_BitScanReverse64(&leading_zero, input_num))
return (int)(63 - leading_zero);
else
return 64;
#else
return __builtin_clzll(input_num);
#endif// SIMDJSON_REGULAR_VISUAL_STUDIO
}
/* result might be undefined when input_num is zero */
simdjson_inline int count_ones(uint64_t input_num) {
return vaddv_u8(vcnt_u8(vcreate_u8(input_num)));
}
#if defined(__GNUC__) // catches clang and gcc
/**
* ARM has a fast 64-bit "bit reversal function" that is handy. However,
* it is not generally available as an intrinsic function under Visual
* Studio (though this might be changing). Even under clang/gcc, we
* apparently need to invoke inline assembly.
*/
/*
* We use SIMDJSON_PREFER_REVERSE_BITS as a hint that algorithms that
* work well with bit reversal may use it.
*/
#define SIMDJSON_PREFER_REVERSE_BITS 1
/* reverse the bits */
simdjson_inline uint64_t reverse_bits(uint64_t input_num) {
uint64_t rev_bits;
__asm("rbit %0, %1" : "=r"(rev_bits) : "r"(input_num));
return rev_bits;
}
/**
* Flips bit at index 63 - lz. Thus if you have 'leading_zeroes' leading zeroes,
* then this will set to zero the leading bit. It is possible for leading_zeroes to be
* greating or equal to 63 in which case we trigger undefined behavior, but the output
* of such undefined behavior is never used.
**/
SIMDJSON_NO_SANITIZE_UNDEFINED
simdjson_inline uint64_t zero_leading_bit(uint64_t rev_bits, int leading_zeroes) {
return rev_bits ^ (uint64_t(0x8000000000000000) >> leading_zeroes);
}
#endif
simdjson_inline bool add_overflow(uint64_t value1, uint64_t value2, uint64_t *result) {
#ifdef SIMDJSON_REGULAR_VISUAL_STUDIO
*result = value1 + value2;
return *result < value1;
#else
return __builtin_uaddll_overflow(value1, value2,
reinterpret_cast<unsigned long long *>(result));
#endif
}
} // unnamed namespace
} // namespace arm64
} // namespace simdjson
#endif // SIMDJSON_ARM64_BITMANIPULATION_H
/* end file simdjson/arm64/bitmanipulation.h */
/* including simdjson/arm64/bitmask.h: #include "simdjson/arm64/bitmask.h" */
/* begin file simdjson/arm64/bitmask.h */
#ifndef SIMDJSON_ARM64_BITMASK_H
#define SIMDJSON_ARM64_BITMASK_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/arm64/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace arm64 {
namespace {
//
// Perform a "cumulative bitwise xor," flipping bits each time a 1 is encountered.
//
// For example, prefix_xor(00100100) == 00011100
//
simdjson_inline uint64_t prefix_xor(uint64_t bitmask) {
/////////////
// We could do this with PMULL, but it is apparently slow.
//
//#ifdef __ARM_FEATURE_CRYPTO // some ARM processors lack this extension
//return vmull_p64(-1ULL, bitmask);
//#else
// Analysis by @sebpop:
// When diffing the assembly for src/stage1_find_marks.cpp I see that the eors are all spread out
// in between other vector code, so effectively the extra cycles of the sequence do not matter
// because the GPR units are idle otherwise and the critical path is on the FP side.
// Also the PMULL requires two extra fmovs: GPR->FP (3 cycles in N1, 5 cycles in A72 )
// and FP->GPR (2 cycles on N1 and 5 cycles on A72.)
///////////
bitmask ^= bitmask << 1;
bitmask ^= bitmask << 2;
bitmask ^= bitmask << 4;
bitmask ^= bitmask << 8;
bitmask ^= bitmask << 16;
bitmask ^= bitmask << 32;
return bitmask;
}
} // unnamed namespace
} // namespace arm64
} // namespace simdjson
#endif
/* end file simdjson/arm64/bitmask.h */
/* including simdjson/arm64/numberparsing_defs.h: #include "simdjson/arm64/numberparsing_defs.h" */
/* begin file simdjson/arm64/numberparsing_defs.h */
#ifndef SIMDJSON_ARM64_NUMBERPARSING_DEFS_H
#define SIMDJSON_ARM64_NUMBERPARSING_DEFS_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/arm64/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/arm64/intrinsics.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/numberparsing_tables.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#include <cstring>
#if _M_ARM64
// __umulh requires intrin.h
#include <intrin.h>
#endif // _M_ARM64
namespace simdjson {
namespace arm64 {
namespace numberparsing {
// we don't have SSE, so let us use a scalar function
// credit: https://johnnylee-sde.github.io/Fast-numeric-string-to-int/
/** @private */
static simdjson_inline uint32_t parse_eight_digits_unrolled(const uint8_t *chars) {
uint64_t val;
std::memcpy(&val, chars, sizeof(uint64_t));
val = (val & 0x0F0F0F0F0F0F0F0F) * 2561 >> 8;
val = (val & 0x00FF00FF00FF00FF) * 6553601 >> 16;
return uint32_t((val & 0x0000FFFF0000FFFF) * 42949672960001 >> 32);
}
simdjson_inline internal::value128 full_multiplication(uint64_t value1, uint64_t value2) {
internal::value128 answer;
#if SIMDJSON_REGULAR_VISUAL_STUDIO || SIMDJSON_IS_32BITS
#ifdef _M_ARM64
// ARM64 has native support for 64-bit multiplications, no need to emultate
answer.high = __umulh(value1, value2);
answer.low = value1 * value2;
#else
answer.low = _umul128(value1, value2, &answer.high); // _umul128 not available on ARM64
#endif // _M_ARM64
#else // SIMDJSON_REGULAR_VISUAL_STUDIO || SIMDJSON_IS_32BITS
__uint128_t r = (static_cast<__uint128_t>(value1)) * value2;
answer.low = uint64_t(r);
answer.high = uint64_t(r >> 64);
#endif
return answer;
}
} // namespace numberparsing
} // namespace arm64
} // namespace simdjson
#define SIMDJSON_SWAR_NUMBER_PARSING 1
#endif // SIMDJSON_ARM64_NUMBERPARSING_DEFS_H
/* end file simdjson/arm64/numberparsing_defs.h */
/* including simdjson/arm64/simd.h: #include "simdjson/arm64/simd.h" */
/* begin file simdjson/arm64/simd.h */
#ifndef SIMDJSON_ARM64_SIMD_H
#define SIMDJSON_ARM64_SIMD_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/arm64/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/arm64/bitmanipulation.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/simdprune_tables.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace arm64 {
namespace {
namespace simd {
#ifdef SIMDJSON_REGULAR_VISUAL_STUDIO
namespace {
// Start of private section with Visual Studio workaround
#ifndef simdjson_make_uint8x16_t
#define simdjson_make_uint8x16_t(x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11, x12, \
x13, x14, x15, x16) \
([=]() { \
uint8_t array[16] = {x1, x2, x3, x4, x5, x6, x7, x8, \
x9, x10, x11, x12, x13, x14, x15, x16}; \
return vld1q_u8(array); \
}())
#endif
#ifndef simdjson_make_int8x16_t
#define simdjson_make_int8x16_t(x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11, x12, \
x13, x14, x15, x16) \
([=]() { \
int8_t array[16] = {x1, x2, x3, x4, x5, x6, x7, x8, \
x9, x10, x11, x12, x13, x14, x15, x16}; \
return vld1q_s8(array); \
}())
#endif
#ifndef simdjson_make_uint8x8_t
#define simdjson_make_uint8x8_t(x1, x2, x3, x4, x5, x6, x7, x8) \
([=]() { \
uint8_t array[8] = {x1, x2, x3, x4, x5, x6, x7, x8}; \
return vld1_u8(array); \
}())
#endif
#ifndef simdjson_make_int8x8_t
#define simdjson_make_int8x8_t(x1, x2, x3, x4, x5, x6, x7, x8) \
([=]() { \
int8_t array[8] = {x1, x2, x3, x4, x5, x6, x7, x8}; \
return vld1_s8(array); \
}())
#endif
#ifndef simdjson_make_uint16x8_t
#define simdjson_make_uint16x8_t(x1, x2, x3, x4, x5, x6, x7, x8) \
([=]() { \
uint16_t array[8] = {x1, x2, x3, x4, x5, x6, x7, x8}; \
return vld1q_u16(array); \
}())
#endif
#ifndef simdjson_make_int16x8_t
#define simdjson_make_int16x8_t(x1, x2, x3, x4, x5, x6, x7, x8) \
([=]() { \
int16_t array[8] = {x1, x2, x3, x4, x5, x6, x7, x8}; \
return vld1q_s16(array); \
}())
#endif
// End of private section with Visual Studio workaround
} // namespace
#endif // SIMDJSON_REGULAR_VISUAL_STUDIO
template<typename T>
struct simd8;
//
// Base class of simd8<uint8_t> and simd8<bool>, both of which use uint8x16_t internally.
//
template<typename T, typename Mask=simd8<bool>>
struct base_u8 {
uint8x16_t value;
static const int SIZE = sizeof(value);
// Conversion from/to SIMD register
simdjson_inline base_u8(const uint8x16_t _value) : value(_value) {}
simdjson_inline operator const uint8x16_t&() const { return this->value; }
simdjson_inline operator uint8x16_t&() { return this->value; }
// Bit operations
simdjson_inline simd8<T> operator|(const simd8<T> other) const { return vorrq_u8(*this, other); }
simdjson_inline simd8<T> operator&(const simd8<T> other) const { return vandq_u8(*this, other); }
simdjson_inline simd8<T> operator^(const simd8<T> other) const { return veorq_u8(*this, other); }
simdjson_inline simd8<T> bit_andnot(const simd8<T> other) const { return vbicq_u8(*this, other); }
simdjson_inline simd8<T> operator~() const { return *this ^ 0xFFu; }
simdjson_inline simd8<T>& operator|=(const simd8<T> other) { auto this_cast = static_cast<simd8<T>*>(this); *this_cast = *this_cast | other; return *this_cast; }
simdjson_inline simd8<T>& operator&=(const simd8<T> other) { auto this_cast = static_cast<simd8<T>*>(this); *this_cast = *this_cast & other; return *this_cast; }
simdjson_inline simd8<T>& operator^=(const simd8<T> other) { auto this_cast = static_cast<simd8<T>*>(this); *this_cast = *this_cast ^ other; return *this_cast; }
friend simdjson_inline Mask operator==(const simd8<T> lhs, const simd8<T> rhs) { return vceqq_u8(lhs, rhs); }
template<int N=1>
simdjson_inline simd8<T> prev(const simd8<T> prev_chunk) const {
return vextq_u8(prev_chunk, *this, 16 - N);
}
};
// SIMD byte mask type (returned by things like eq and gt)
template<>
struct simd8<bool>: base_u8<bool> {
typedef uint16_t bitmask_t;
typedef uint32_t bitmask2_t;
static simdjson_inline simd8<bool> splat(bool _value) { return vmovq_n_u8(uint8_t(-(!!_value))); }
simdjson_inline simd8(const uint8x16_t _value) : base_u8<bool>(_value) {}
// False constructor
simdjson_inline simd8() : simd8(vdupq_n_u8(0)) {}
// Splat constructor
simdjson_inline simd8(bool _value) : simd8(splat(_value)) {}
// We return uint32_t instead of uint16_t because that seems to be more efficient for most
// purposes (cutting it down to uint16_t costs performance in some compilers).
simdjson_inline uint32_t to_bitmask() const {
#ifdef SIMDJSON_REGULAR_VISUAL_STUDIO
const uint8x16_t bit_mask = simdjson_make_uint8x16_t(0x01, 0x02, 0x4, 0x8, 0x10, 0x20, 0x40, 0x80,
0x01, 0x02, 0x4, 0x8, 0x10, 0x20, 0x40, 0x80);
#else
const uint8x16_t bit_mask = {0x01, 0x02, 0x4, 0x8, 0x10, 0x20, 0x40, 0x80,
0x01, 0x02, 0x4, 0x8, 0x10, 0x20, 0x40, 0x80};
#endif
auto minput = *this & bit_mask;
uint8x16_t tmp = vpaddq_u8(minput, minput);
tmp = vpaddq_u8(tmp, tmp);
tmp = vpaddq_u8(tmp, tmp);
return vgetq_lane_u16(vreinterpretq_u16_u8(tmp), 0);
}
simdjson_inline bool any() const { return vmaxvq_u8(*this) != 0; }
};
// Unsigned bytes
template<>
struct simd8<uint8_t>: base_u8<uint8_t> {
static simdjson_inline uint8x16_t splat(uint8_t _value) { return vmovq_n_u8(_value); }
static simdjson_inline uint8x16_t zero() { return vdupq_n_u8(0); }
static simdjson_inline uint8x16_t load(const uint8_t* values) { return vld1q_u8(values); }
simdjson_inline simd8(const uint8x16_t _value) : base_u8<uint8_t>(_value) {}
// Zero constructor
simdjson_inline simd8() : simd8(zero()) {}
// Array constructor
simdjson_inline simd8(const uint8_t values[16]) : simd8(load(values)) {}
// Splat constructor
simdjson_inline simd8(uint8_t _value) : simd8(splat(_value)) {}
// Member-by-member initialization
#ifdef SIMDJSON_REGULAR_VISUAL_STUDIO
simdjson_inline simd8(
uint8_t v0, uint8_t v1, uint8_t v2, uint8_t v3, uint8_t v4, uint8_t v5, uint8_t v6, uint8_t v7,
uint8_t v8, uint8_t v9, uint8_t v10, uint8_t v11, uint8_t v12, uint8_t v13, uint8_t v14, uint8_t v15
) : simd8(simdjson_make_uint8x16_t(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
)) {}
#else
simdjson_inline simd8(
uint8_t v0, uint8_t v1, uint8_t v2, uint8_t v3, uint8_t v4, uint8_t v5, uint8_t v6, uint8_t v7,
uint8_t v8, uint8_t v9, uint8_t v10, uint8_t v11, uint8_t v12, uint8_t v13, uint8_t v14, uint8_t v15
) : simd8(uint8x16_t{
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
}) {}
#endif
// Repeat 16 values as many times as necessary (usually for lookup tables)
simdjson_inline static simd8<uint8_t> repeat_16(
uint8_t v0, uint8_t v1, uint8_t v2, uint8_t v3, uint8_t v4, uint8_t v5, uint8_t v6, uint8_t v7,
uint8_t v8, uint8_t v9, uint8_t v10, uint8_t v11, uint8_t v12, uint8_t v13, uint8_t v14, uint8_t v15
) {
return simd8<uint8_t>(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
);
}
// Store to array
simdjson_inline void store(uint8_t dst[16]) const { return vst1q_u8(dst, *this); }
// Saturated math
simdjson_inline simd8<uint8_t> saturating_add(const simd8<uint8_t> other) const { return vqaddq_u8(*this, other); }
simdjson_inline simd8<uint8_t> saturating_sub(const simd8<uint8_t> other) const { return vqsubq_u8(*this, other); }
// Addition/subtraction are the same for signed and unsigned
simdjson_inline simd8<uint8_t> operator+(const simd8<uint8_t> other) const { return vaddq_u8(*this, other); }
simdjson_inline simd8<uint8_t> operator-(const simd8<uint8_t> other) const { return vsubq_u8(*this, other); }
simdjson_inline simd8<uint8_t>& operator+=(const simd8<uint8_t> other) { *this = *this + other; return *this; }
simdjson_inline simd8<uint8_t>& operator-=(const simd8<uint8_t> other) { *this = *this - other; return *this; }
// Order-specific operations
simdjson_inline uint8_t max_val() const { return vmaxvq_u8(*this); }
simdjson_inline uint8_t min_val() const { return vminvq_u8(*this); }
simdjson_inline simd8<uint8_t> max_val(const simd8<uint8_t> other) const { return vmaxq_u8(*this, other); }
simdjson_inline simd8<uint8_t> min_val(const simd8<uint8_t> other) const { return vminq_u8(*this, other); }
simdjson_inline simd8<bool> operator<=(const simd8<uint8_t> other) const { return vcleq_u8(*this, other); }
simdjson_inline simd8<bool> operator>=(const simd8<uint8_t> other) const { return vcgeq_u8(*this, other); }
simdjson_inline simd8<bool> operator<(const simd8<uint8_t> other) const { return vcltq_u8(*this, other); }
simdjson_inline simd8<bool> operator>(const simd8<uint8_t> other) const { return vcgtq_u8(*this, other); }
// Same as >, but instead of guaranteeing all 1's == true, false = 0 and true = nonzero. For ARM, returns all 1's.
simdjson_inline simd8<uint8_t> gt_bits(const simd8<uint8_t> other) const { return simd8<uint8_t>(*this > other); }
// Same as <, but instead of guaranteeing all 1's == true, false = 0 and true = nonzero. For ARM, returns all 1's.
simdjson_inline simd8<uint8_t> lt_bits(const simd8<uint8_t> other) const { return simd8<uint8_t>(*this < other); }
// Bit-specific operations
simdjson_inline simd8<bool> any_bits_set(simd8<uint8_t> bits) const { return vtstq_u8(*this, bits); }
simdjson_inline bool any_bits_set_anywhere() const { return this->max_val() != 0; }
simdjson_inline bool any_bits_set_anywhere(simd8<uint8_t> bits) const { return (*this & bits).any_bits_set_anywhere(); }
template<int N>
simdjson_inline simd8<uint8_t> shr() const { return vshrq_n_u8(*this, N); }
template<int N>
simdjson_inline simd8<uint8_t> shl() const { return vshlq_n_u8(*this, N); }
// Perform a lookup assuming the value is between 0 and 16 (undefined behavior for out of range values)
template<typename L>
simdjson_inline simd8<L> lookup_16(simd8<L> lookup_table) const {
return lookup_table.apply_lookup_16_to(*this);
}
// Copies to 'output" all bytes corresponding to a 0 in the mask (interpreted as a bitset).
// Passing a 0 value for mask would be equivalent to writing out every byte to output.
// Only the first 16 - count_ones(mask) bytes of the result are significant but 16 bytes
// get written.
// Design consideration: it seems like a function with the
// signature simd8<L> compress(uint16_t mask) would be
// sensible, but the AVX ISA makes this kind of approach difficult.
template<typename L>
simdjson_inline void compress(uint16_t mask, L * output) const {
using internal::thintable_epi8;
using internal::BitsSetTable256mul2;
using internal::pshufb_combine_table;
// this particular implementation was inspired by work done by @animetosho
// we do it in two steps, first 8 bytes and then second 8 bytes
uint8_t mask1 = uint8_t(mask); // least significant 8 bits
uint8_t mask2 = uint8_t(mask >> 8); // most significant 8 bits
// next line just loads the 64-bit values thintable_epi8[mask1] and
// thintable_epi8[mask2] into a 128-bit register, using only
// two instructions on most compilers.
uint64x2_t shufmask64 = {thintable_epi8[mask1], thintable_epi8[mask2]};
uint8x16_t shufmask = vreinterpretq_u8_u64(shufmask64);
// we increment by 0x08 the second half of the mask
#ifdef SIMDJSON_REGULAR_VISUAL_STUDIO
uint8x16_t inc = simdjson_make_uint8x16_t(0, 0, 0, 0, 0, 0, 0, 0, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08);
#else
uint8x16_t inc = {0, 0, 0, 0, 0, 0, 0, 0, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08};
#endif
shufmask = vaddq_u8(shufmask, inc);
// this is the version "nearly pruned"
uint8x16_t pruned = vqtbl1q_u8(*this, shufmask);
// we still need to put the two halves together.
// we compute the popcount of the first half:
int pop1 = BitsSetTable256mul2[mask1];
// then load the corresponding mask, what it does is to write
// only the first pop1 bytes from the first 8 bytes, and then
// it fills in with the bytes from the second 8 bytes + some filling
// at the end.
uint8x16_t compactmask = vld1q_u8(reinterpret_cast<const uint8_t *>(pshufb_combine_table + pop1 * 8));
uint8x16_t answer = vqtbl1q_u8(pruned, compactmask);
vst1q_u8(reinterpret_cast<uint8_t*>(output), answer);
}
// Copies all bytes corresponding to a 0 in the low half of the mask (interpreted as a
// bitset) to output1, then those corresponding to a 0 in the high half to output2.
template<typename L>
simdjson_inline void compress_halves(uint16_t mask, L *output1, L *output2) const {
using internal::thintable_epi8;
uint8_t mask1 = uint8_t(mask); // least significant 8 bits
uint8_t mask2 = uint8_t(mask >> 8); // most significant 8 bits
uint8x8_t compactmask1 = vcreate_u8(thintable_epi8[mask1]);
uint8x8_t compactmask2 = vcreate_u8(thintable_epi8[mask2]);
// we increment by 0x08 the second half of the mask
#ifdef SIMDJSON_REGULAR_VISUAL_STUDIO
uint8x8_t inc = simdjson_make_uint8x8_t(0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08);
#else
uint8x8_t inc = {0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08};
#endif
compactmask2 = vadd_u8(compactmask2, inc);
// store each result (with the second store possibly overlapping the first)
vst1_u8((uint8_t*)output1, vqtbl1_u8(*this, compactmask1));
vst1_u8((uint8_t*)output2, vqtbl1_u8(*this, compactmask2));
}
template<typename L>
simdjson_inline simd8<L> lookup_16(
L replace0, L replace1, L replace2, L replace3,
L replace4, L replace5, L replace6, L replace7,
L replace8, L replace9, L replace10, L replace11,
L replace12, L replace13, L replace14, L replace15) const {
return lookup_16(simd8<L>::repeat_16(
replace0, replace1, replace2, replace3,
replace4, replace5, replace6, replace7,
replace8, replace9, replace10, replace11,
replace12, replace13, replace14, replace15
));
}
template<typename T>
simdjson_inline simd8<uint8_t> apply_lookup_16_to(const simd8<T> original) {
return vqtbl1q_u8(*this, simd8<uint8_t>(original));
}
};
// Signed bytes
template<>
struct simd8<int8_t> {
int8x16_t value;
static simdjson_inline simd8<int8_t> splat(int8_t _value) { return vmovq_n_s8(_value); }
static simdjson_inline simd8<int8_t> zero() { return vdupq_n_s8(0); }
static simdjson_inline simd8<int8_t> load(const int8_t values[16]) { return vld1q_s8(values); }
// Conversion from/to SIMD register
simdjson_inline simd8(const int8x16_t _value) : value{_value} {}
simdjson_inline operator const int8x16_t&() const { return this->value; }
simdjson_inline operator int8x16_t&() { return this->value; }
// Zero constructor
simdjson_inline simd8() : simd8(zero()) {}
// Splat constructor
simdjson_inline simd8(int8_t _value) : simd8(splat(_value)) {}
// Array constructor
simdjson_inline simd8(const int8_t* values) : simd8(load(values)) {}
// Member-by-member initialization
#ifdef SIMDJSON_REGULAR_VISUAL_STUDIO
simdjson_inline simd8(
int8_t v0, int8_t v1, int8_t v2, int8_t v3, int8_t v4, int8_t v5, int8_t v6, int8_t v7,
int8_t v8, int8_t v9, int8_t v10, int8_t v11, int8_t v12, int8_t v13, int8_t v14, int8_t v15
) : simd8(simdjson_make_int8x16_t(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
)) {}
#else
simdjson_inline simd8(
int8_t v0, int8_t v1, int8_t v2, int8_t v3, int8_t v4, int8_t v5, int8_t v6, int8_t v7,
int8_t v8, int8_t v9, int8_t v10, int8_t v11, int8_t v12, int8_t v13, int8_t v14, int8_t v15
) : simd8(int8x16_t{
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
}) {}
#endif
// Repeat 16 values as many times as necessary (usually for lookup tables)
simdjson_inline static simd8<int8_t> repeat_16(
int8_t v0, int8_t v1, int8_t v2, int8_t v3, int8_t v4, int8_t v5, int8_t v6, int8_t v7,
int8_t v8, int8_t v9, int8_t v10, int8_t v11, int8_t v12, int8_t v13, int8_t v14, int8_t v15
) {
return simd8<int8_t>(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
);
}
// Store to array
simdjson_inline void store(int8_t dst[16]) const { return vst1q_s8(dst, *this); }
// Explicit conversion to/from unsigned
//
// Under Visual Studio/ARM64 uint8x16_t and int8x16_t are apparently the same type.
// In theory, we could check this occurrence with std::same_as and std::enabled_if but it is C++14
// and relatively ugly and hard to read.
#ifndef SIMDJSON_REGULAR_VISUAL_STUDIO
simdjson_inline explicit simd8(const uint8x16_t other): simd8(vreinterpretq_s8_u8(other)) {}
#endif
simdjson_inline explicit operator simd8<uint8_t>() const { return vreinterpretq_u8_s8(this->value); }
// Math
simdjson_inline simd8<int8_t> operator+(const simd8<int8_t> other) const { return vaddq_s8(*this, other); }
simdjson_inline simd8<int8_t> operator-(const simd8<int8_t> other) const { return vsubq_s8(*this, other); }
simdjson_inline simd8<int8_t>& operator+=(const simd8<int8_t> other) { *this = *this + other; return *this; }
simdjson_inline simd8<int8_t>& operator-=(const simd8<int8_t> other) { *this = *this - other; return *this; }
// Order-sensitive comparisons
simdjson_inline simd8<int8_t> max_val(const simd8<int8_t> other) const { return vmaxq_s8(*this, other); }
simdjson_inline simd8<int8_t> min_val(const simd8<int8_t> other) const { return vminq_s8(*this, other); }
simdjson_inline simd8<bool> operator>(const simd8<int8_t> other) const { return vcgtq_s8(*this, other); }
simdjson_inline simd8<bool> operator<(const simd8<int8_t> other) const { return vcltq_s8(*this, other); }
simdjson_inline simd8<bool> operator==(const simd8<int8_t> other) const { return vceqq_s8(*this, other); }
template<int N=1>
simdjson_inline simd8<int8_t> prev(const simd8<int8_t> prev_chunk) const {
return vextq_s8(prev_chunk, *this, 16 - N);
}
// Perform a lookup assuming no value is larger than 16
template<typename L>
simdjson_inline simd8<L> lookup_16(simd8<L> lookup_table) const {
return lookup_table.apply_lookup_16_to(*this);
}
template<typename L>
simdjson_inline simd8<L> lookup_16(
L replace0, L replace1, L replace2, L replace3,
L replace4, L replace5, L replace6, L replace7,
L replace8, L replace9, L replace10, L replace11,
L replace12, L replace13, L replace14, L replace15) const {
return lookup_16(simd8<L>::repeat_16(
replace0, replace1, replace2, replace3,
replace4, replace5, replace6, replace7,
replace8, replace9, replace10, replace11,
replace12, replace13, replace14, replace15
));
}
template<typename T>
simdjson_inline simd8<int8_t> apply_lookup_16_to(const simd8<T> original) {
return vqtbl1q_s8(*this, simd8<uint8_t>(original));
}
};
template<typename T>
struct simd8x64 {
static constexpr int NUM_CHUNKS = 64 / sizeof(simd8<T>);
static_assert(NUM_CHUNKS == 4, "ARM kernel should use four registers per 64-byte block.");
const simd8<T> chunks[NUM_CHUNKS];
simd8x64(const simd8x64<T>& o) = delete; // no copy allowed
simd8x64<T>& operator=(const simd8<T>& other) = delete; // no assignment allowed
simd8x64() = delete; // no default constructor allowed
simdjson_inline simd8x64(const simd8<T> chunk0, const simd8<T> chunk1, const simd8<T> chunk2, const simd8<T> chunk3) : chunks{chunk0, chunk1, chunk2, chunk3} {}
simdjson_inline simd8x64(const T ptr[64]) : chunks{simd8<T>::load(ptr), simd8<T>::load(ptr+16), simd8<T>::load(ptr+32), simd8<T>::load(ptr+48)} {}
simdjson_inline void store(T ptr[64]) const {
this->chunks[0].store(ptr+sizeof(simd8<T>)*0);
this->chunks[1].store(ptr+sizeof(simd8<T>)*1);
this->chunks[2].store(ptr+sizeof(simd8<T>)*2);
this->chunks[3].store(ptr+sizeof(simd8<T>)*3);
}
simdjson_inline simd8<T> reduce_or() const {
return (this->chunks[0] | this->chunks[1]) | (this->chunks[2] | this->chunks[3]);
}
simdjson_inline uint64_t compress(uint64_t mask, T * output) const {
uint64_t popcounts = vget_lane_u64(vreinterpret_u64_u8(vcnt_u8(vcreate_u8(~mask))), 0);
// compute the prefix sum of the popcounts of each byte
uint64_t offsets = popcounts * 0x0101010101010101;
this->chunks[0].compress_halves(uint16_t(mask), output, &output[popcounts & 0xFF]);
this->chunks[1].compress_halves(uint16_t(mask >> 16), &output[(offsets >> 8) & 0xFF], &output[(offsets >> 16) & 0xFF]);
this->chunks[2].compress_halves(uint16_t(mask >> 32), &output[(offsets >> 24) & 0xFF], &output[(offsets >> 32) & 0xFF]);
this->chunks[3].compress_halves(uint16_t(mask >> 48), &output[(offsets >> 40) & 0xFF], &output[(offsets >> 48) & 0xFF]);
return offsets >> 56;
}
simdjson_inline uint64_t to_bitmask() const {
#ifdef SIMDJSON_REGULAR_VISUAL_STUDIO
const uint8x16_t bit_mask = simdjson_make_uint8x16_t(
0x01, 0x02, 0x4, 0x8, 0x10, 0x20, 0x40, 0x80,
0x01, 0x02, 0x4, 0x8, 0x10, 0x20, 0x40, 0x80
);
#else
const uint8x16_t bit_mask = {
0x01, 0x02, 0x4, 0x8, 0x10, 0x20, 0x40, 0x80,
0x01, 0x02, 0x4, 0x8, 0x10, 0x20, 0x40, 0x80
};
#endif
// Add each of the elements next to each other, successively, to stuff each 8 byte mask into one.
uint8x16_t sum0 = vpaddq_u8(this->chunks[0] & bit_mask, this->chunks[1] & bit_mask);
uint8x16_t sum1 = vpaddq_u8(this->chunks[2] & bit_mask, this->chunks[3] & bit_mask);
sum0 = vpaddq_u8(sum0, sum1);
sum0 = vpaddq_u8(sum0, sum0);
return vgetq_lane_u64(vreinterpretq_u64_u8(sum0), 0);
}
simdjson_inline uint64_t eq(const T m) const {
const simd8<T> mask = simd8<T>::splat(m);
return simd8x64<bool>(
this->chunks[0] == mask,
this->chunks[1] == mask,
this->chunks[2] == mask,
this->chunks[3] == mask
).to_bitmask();
}
simdjson_inline uint64_t lteq(const T m) const {
const simd8<T> mask = simd8<T>::splat(m);
return simd8x64<bool>(
this->chunks[0] <= mask,
this->chunks[1] <= mask,
this->chunks[2] <= mask,
this->chunks[3] <= mask
).to_bitmask();
}
}; // struct simd8x64<T>
} // namespace simd
} // unnamed namespace
} // namespace arm64
} // namespace simdjson
#endif // SIMDJSON_ARM64_SIMD_H
/* end file simdjson/arm64/simd.h */
/* including simdjson/arm64/stringparsing_defs.h: #include "simdjson/arm64/stringparsing_defs.h" */
/* begin file simdjson/arm64/stringparsing_defs.h */
#ifndef SIMDJSON_ARM64_STRINGPARSING_DEFS_H
#define SIMDJSON_ARM64_STRINGPARSING_DEFS_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/arm64/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/arm64/simd.h" */
/* amalgamation skipped (editor-only): #include "simdjson/arm64/bitmanipulation.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace arm64 {
namespace {
using namespace simd;
// Holds backslashes and quotes locations.
struct backslash_and_quote {
public:
static constexpr uint32_t BYTES_PROCESSED = 32;
simdjson_inline static backslash_and_quote copy_and_find(const uint8_t *src, uint8_t *dst);
simdjson_inline bool has_quote_first() { return ((bs_bits - 1) & quote_bits) != 0; }
simdjson_inline bool has_backslash() { return bs_bits != 0; }
simdjson_inline int quote_index() { return trailing_zeroes(quote_bits); }
simdjson_inline int backslash_index() { return trailing_zeroes(bs_bits); }
uint32_t bs_bits;
uint32_t quote_bits;
}; // struct backslash_and_quote
simdjson_inline backslash_and_quote backslash_and_quote::copy_and_find(const uint8_t *src, uint8_t *dst) {
// this can read up to 31 bytes beyond the buffer size, but we require
// SIMDJSON_PADDING of padding
static_assert(SIMDJSON_PADDING >= (BYTES_PROCESSED - 1), "backslash and quote finder must process fewer than SIMDJSON_PADDING bytes");
simd8<uint8_t> v0(src);
simd8<uint8_t> v1(src + sizeof(v0));
v0.store(dst);
v1.store(dst + sizeof(v0));
// Getting a 64-bit bitmask is much cheaper than multiple 16-bit bitmasks on ARM; therefore, we
// smash them together into a 64-byte mask and get the bitmask from there.
uint64_t bs_and_quote = simd8x64<bool>(v0 == '\\', v1 == '\\', v0 == '"', v1 == '"').to_bitmask();
return {
uint32_t(bs_and_quote), // bs_bits
uint32_t(bs_and_quote >> 32) // quote_bits
};
}
} // unnamed namespace
} // namespace arm64
} // namespace simdjson
#endif // SIMDJSON_ARM64_STRINGPARSING_DEFS_H
/* end file simdjson/arm64/stringparsing_defs.h */
#define SIMDJSON_SKIP_BACKSLASH_SHORT_CIRCUIT 1
/* end file simdjson/arm64/begin.h */
/* including generic/amalgamated.h for arm64: #include <generic/amalgamated.h> */
/* begin file generic/amalgamated.h for arm64 */
#if defined(SIMDJSON_CONDITIONAL_INCLUDE) && !defined(SIMDJSON_SRC_GENERIC_DEPENDENCIES_H)
#error generic/dependencies.h must be included before generic/amalgamated.h!
#endif
/* including generic/base.h for arm64: #include <generic/base.h> */
/* begin file generic/base.h for arm64 */
#ifndef SIMDJSON_SRC_GENERIC_BASE_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_BASE_H */
/* amalgamation skipped (editor-only): #include <base.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/base.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace arm64 {
namespace {
struct json_character_block;
} // unnamed namespace
} // namespace arm64
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_BASE_H
/* end file generic/base.h for arm64 */
/* including generic/dom_parser_implementation.h for arm64: #include <generic/dom_parser_implementation.h> */
/* begin file generic/dom_parser_implementation.h for arm64 */
#ifndef SIMDJSON_SRC_GENERIC_DOM_PARSER_IMPLEMENTATION_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_DOM_PARSER_IMPLEMENTATION_H */
/* amalgamation skipped (editor-only): #include <generic/base.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/dom_parser_implementation.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
// Interface a dom parser implementation must fulfill
namespace simdjson {
namespace arm64 {
namespace {
simdjson_inline simd8<uint8_t> must_be_2_3_continuation(const simd8<uint8_t> prev2, const simd8<uint8_t> prev3);
simdjson_inline bool is_ascii(const simd8x64<uint8_t>& input);
} // unnamed namespace
} // namespace arm64
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_DOM_PARSER_IMPLEMENTATION_H
/* end file generic/dom_parser_implementation.h for arm64 */
/* including generic/json_character_block.h for arm64: #include <generic/json_character_block.h> */
/* begin file generic/json_character_block.h for arm64 */
#ifndef SIMDJSON_SRC_GENERIC_JSON_CHARACTER_BLOCK_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_JSON_CHARACTER_BLOCK_H */
/* amalgamation skipped (editor-only): #include <generic/base.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace arm64 {
namespace {
struct json_character_block {
static simdjson_inline json_character_block classify(const simd::simd8x64<uint8_t>& in);
simdjson_inline uint64_t whitespace() const noexcept { return _whitespace; }
simdjson_inline uint64_t op() const noexcept { return _op; }
simdjson_inline uint64_t scalar() const noexcept { return ~(op() | whitespace()); }
uint64_t _whitespace;
uint64_t _op;
};
} // unnamed namespace
} // namespace arm64
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_JSON_CHARACTER_BLOCK_H
/* end file generic/json_character_block.h for arm64 */
/* end file generic/amalgamated.h for arm64 */
/* including generic/stage1/amalgamated.h for arm64: #include <generic/stage1/amalgamated.h> */
/* begin file generic/stage1/amalgamated.h for arm64 */
// Stuff other things depend on
/* including generic/stage1/base.h for arm64: #include <generic/stage1/base.h> */
/* begin file generic/stage1/base.h for arm64 */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_BASE_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_BASE_H */
/* amalgamation skipped (editor-only): #include <generic/base.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace arm64 {
namespace {
namespace stage1 {
class bit_indexer;
template<size_t STEP_SIZE>
struct buf_block_reader;
struct json_block;
class json_minifier;
class json_scanner;
struct json_string_block;
class json_string_scanner;
class json_structural_indexer;
} // namespace stage1
namespace utf8_validation {
struct utf8_checker;
} // namespace utf8_validation
using utf8_validation::utf8_checker;
} // unnamed namespace
} // namespace arm64
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE1_BASE_H
/* end file generic/stage1/base.h for arm64 */
/* including generic/stage1/buf_block_reader.h for arm64: #include <generic/stage1/buf_block_reader.h> */
/* begin file generic/stage1/buf_block_reader.h for arm64 */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_BUF_BLOCK_READER_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_BUF_BLOCK_READER_H */
/* amalgamation skipped (editor-only): #include <generic/stage1/base.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#include <cstring>
namespace simdjson {
namespace arm64 {
namespace {
namespace stage1 {
// Walks through a buffer in block-sized increments, loading the last part with spaces
template<size_t STEP_SIZE>
struct buf_block_reader {
public:
simdjson_inline buf_block_reader(const uint8_t *_buf, size_t _len);
simdjson_inline size_t block_index();
simdjson_inline bool has_full_block() const;
simdjson_inline const uint8_t *full_block() const;
/**
* Get the last block, padded with spaces.
*
* There will always be a last block, with at least 1 byte, unless len == 0 (in which case this
* function fills the buffer with spaces and returns 0. In particular, if len == STEP_SIZE there
* will be 0 full_blocks and 1 remainder block with STEP_SIZE bytes and no spaces for padding.
*
* @return the number of effective characters in the last block.
*/
simdjson_inline size_t get_remainder(uint8_t *dst) const;
simdjson_inline void advance();
private:
const uint8_t *buf;
const size_t len;
const size_t lenminusstep;
size_t idx;
};
// Routines to print masks and text for debugging bitmask operations
simdjson_unused static char * format_input_text_64(const uint8_t *text) {
static char buf[sizeof(simd8x64<uint8_t>) + 1];
for (size_t i=0; i<sizeof(simd8x64<uint8_t>); i++) {
buf[i] = int8_t(text[i]) < ' ' ? '_' : int8_t(text[i]);
}
buf[sizeof(simd8x64<uint8_t>)] = '\0';
return buf;
}
// Routines to print masks and text for debugging bitmask operations
simdjson_unused static char * format_input_text(const simd8x64<uint8_t>& in) {
static char buf[sizeof(simd8x64<uint8_t>) + 1];
in.store(reinterpret_cast<uint8_t*>(buf));
for (size_t i=0; i<sizeof(simd8x64<uint8_t>); i++) {
if (buf[i] < ' ') { buf[i] = '_'; }
}
buf[sizeof(simd8x64<uint8_t>)] = '\0';
return buf;
}
simdjson_unused static char * format_input_text(const simd8x64<uint8_t>& in, uint64_t mask) {
static char buf[sizeof(simd8x64<uint8_t>) + 1];
in.store(reinterpret_cast<uint8_t*>(buf));
for (size_t i=0; i<sizeof(simd8x64<uint8_t>); i++) {
if (buf[i] <= ' ') { buf[i] = '_'; }
if (!(mask & (size_t(1) << i))) { buf[i] = ' '; }
}
buf[sizeof(simd8x64<uint8_t>)] = '\0';
return buf;
}
simdjson_unused static char * format_mask(uint64_t mask) {
static char buf[sizeof(simd8x64<uint8_t>) + 1];
for (size_t i=0; i<64; i++) {
buf[i] = (mask & (size_t(1) << i)) ? 'X' : ' ';
}
buf[64] = '\0';
return buf;
}
template<size_t STEP_SIZE>
simdjson_inline buf_block_reader<STEP_SIZE>::buf_block_reader(const uint8_t *_buf, size_t _len) : buf{_buf}, len{_len}, lenminusstep{len < STEP_SIZE ? 0 : len - STEP_SIZE}, idx{0} {}
template<size_t STEP_SIZE>
simdjson_inline size_t buf_block_reader<STEP_SIZE>::block_index() { return idx; }
template<size_t STEP_SIZE>
simdjson_inline bool buf_block_reader<STEP_SIZE>::has_full_block() const {
return idx < lenminusstep;
}
template<size_t STEP_SIZE>
simdjson_inline const uint8_t *buf_block_reader<STEP_SIZE>::full_block() const {
return &buf[idx];
}
template<size_t STEP_SIZE>
simdjson_inline size_t buf_block_reader<STEP_SIZE>::get_remainder(uint8_t *dst) const {
if(len == idx) { return 0; } // memcpy(dst, null, 0) will trigger an error with some sanitizers
std::memset(dst, 0x20, STEP_SIZE); // std::memset STEP_SIZE because it's more efficient to write out 8 or 16 bytes at once.
std::memcpy(dst, buf + idx, len - idx);
return len - idx;
}
template<size_t STEP_SIZE>
simdjson_inline void buf_block_reader<STEP_SIZE>::advance() {
idx += STEP_SIZE;
}
} // namespace stage1
} // unnamed namespace
} // namespace arm64
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE1_BUF_BLOCK_READER_H
/* end file generic/stage1/buf_block_reader.h for arm64 */
/* including generic/stage1/json_escape_scanner.h for arm64: #include <generic/stage1/json_escape_scanner.h> */
/* begin file generic/stage1/json_escape_scanner.h for arm64 */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_JSON_ESCAPE_SCANNER_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_JSON_ESCAPE_SCANNER_H */
/* amalgamation skipped (editor-only): #include <generic/stage1/base.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/buf_block_reader.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace arm64 {
namespace {
namespace stage1 {
/**
* Scans for escape characters in JSON, taking care with multiple backslashes (\\n vs. \n).
*/
struct json_escape_scanner {
/** The actual escape characters (the backslashes themselves). */
uint64_t next_is_escaped = 0ULL;
struct escaped_and_escape {
/**
* Mask of escaped characters.
*
* ```
* \n \\n \\\n \\\\n \
* 0100100010100101000
* n \ \ n \ \
* ```
*/
uint64_t escaped;
/**
* Mask of escape characters.
*
* ```
* \n \\n \\\n \\\\n \
* 1001000101001010001
* \ \ \ \ \ \ \
* ```
*/
uint64_t escape;
};
/**
* Get a mask of both escape and escaped characters (the characters following a backslash).
*
* @param potential_escape A mask of the character that can escape others (but could be
* escaped itself). e.g. block.eq('\\')
*/
simdjson_really_inline escaped_and_escape next(uint64_t backslash) noexcept {
#if !SIMDJSON_SKIP_BACKSLASH_SHORT_CIRCUIT
if (!backslash) { return {next_escaped_without_backslashes(), 0}; }
#endif
// | | Mask (shows characters instead of 1's) | Depth | Instructions |
// |--------------------------------|----------------------------------------|-------|---------------------|
// | string | `\\n_\\\n___\\\n___\\\\___\\\\__\\\` | | |
// | | ` even odd even odd odd` | | |
// | potential_escape | ` \ \\\ \\\ \\\\ \\\\ \\\` | 1 | 1 (backslash & ~first_is_escaped)
// | escape_and_terminal_code | ` \n \ \n \ \n \ \ \ \ \ \` | 5 | 5 (next_escape_and_terminal_code())
// | escaped | `\ \ n \ n \ \ \ \ \ ` X | 6 | 7 (escape_and_terminal_code ^ (potential_escape | first_is_escaped))
// | escape | ` \ \ \ \ \ \ \ \ \ \` | 6 | 8 (escape_and_terminal_code & backslash)
// | first_is_escaped | `\ ` | 7 (*) | 9 (escape >> 63) ()
// (*) this is not needed until the next iteration
uint64_t escape_and_terminal_code = next_escape_and_terminal_code(backslash & ~this->next_is_escaped);
uint64_t escaped = escape_and_terminal_code ^ (backslash | this->next_is_escaped);
uint64_t escape = escape_and_terminal_code & backslash;
this->next_is_escaped = escape >> 63;
return {escaped, escape};
}
private:
static constexpr const uint64_t ODD_BITS = 0xAAAAAAAAAAAAAAAAULL;
simdjson_really_inline uint64_t next_escaped_without_backslashes() noexcept {
uint64_t escaped = this->next_is_escaped;
this->next_is_escaped = 0;
return escaped;
}
/**
* Returns a mask of the next escape characters (masking out escaped backslashes), along with
* any non-backslash escape codes.
*
* \n \\n \\\n \\\\n returns:
* \n \ \ \n \ \
* 11 100 1011 10100
*
* You are expected to mask out the first bit yourself if the previous block had a trailing
* escape.
*
* & the result with potential_escape to get just the escape characters.
* ^ the result with (potential_escape | first_is_escaped) to get escaped characters.
*/
static simdjson_really_inline uint64_t next_escape_and_terminal_code(uint64_t potential_escape) noexcept {
// If we were to just shift and mask out any odd bits, we'd actually get a *half* right answer:
// any even-aligned backslash runs would be correct! Odd-aligned backslash runs would be
// inverted (\\\ would be 010 instead of 101).
//
// ```
// string: | ____\\\\_\\\\_____ |
// maybe_escaped | ODD | \ \ \ \ |
// even-aligned ^^^ ^^^^ odd-aligned
// ```
//
// Taking that into account, our basic strategy is:
//
// 1. Use subtraction to produce a mask with 1's for even-aligned runs and 0's for
// odd-aligned runs.
// 2. XOR all odd bits, which masks out the odd bits in even-aligned runs, and brings IN the
// odd bits in odd-aligned runs.
// 3. & with backslash to clean up any stray bits.
// runs are set to 0, and then XORing with "odd":
//
// | | Mask (shows characters instead of 1's) | Instructions |
// |--------------------------------|----------------------------------------|---------------------|
// | string | `\\n_\\\n___\\\n___\\\\___\\\\__\\\` |
// | | ` even odd even odd odd` |
// | maybe_escaped | ` n \\n \\n \\\_ \\\_ \\` X | 1 (potential_escape << 1)
// | maybe_escaped_and_odd | ` \n_ \\n _ \\\n_ _ \\\__ _\\\_ \\\` | 1 (maybe_escaped | odd)
// | even_series_codes_and_odd | ` n_\\\ _ n_ _\\\\ _ _ ` | 1 (maybe_escaped_and_odd - potential_escape)
// | escape_and_terminal_code | ` \n \ \n \ \n \ \ \ \ \ \` | 1 (^ odd)
//
// Escaped characters are characters following an escape.
uint64_t maybe_escaped = potential_escape << 1;
// To distinguish odd from even escape sequences, therefore, we turn on any *starting*
// escapes that are on an odd byte. (We actually bring in all odd bits, for speed.)
// - Odd runs of backslashes are 0000, and the code at the end ("n" in \n or \\n) is 1.
// - Odd runs of backslashes are 1111, and the code at the end ("n" in \n or \\n) is 0.
// - All other odd bytes are 1, and even bytes are 0.
uint64_t maybe_escaped_and_odd_bits = maybe_escaped | ODD_BITS;
uint64_t even_series_codes_and_odd_bits = maybe_escaped_and_odd_bits - potential_escape;
// Now we flip all odd bytes back with xor. This:
// - Makes odd runs of backslashes go from 0000 to 1010
// - Makes even runs of backslashes go from 1111 to 1010
// - Sets actually-escaped codes to 1 (the n in \n and \\n: \n = 11, \\n = 100)
// - Resets all other bytes to 0
return even_series_codes_and_odd_bits ^ ODD_BITS;
}
};
} // namespace stage1
} // unnamed namespace
} // namespace arm64
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE1_JSON_STRING_SCANNER_H
/* end file generic/stage1/json_escape_scanner.h for arm64 */
/* including generic/stage1/json_string_scanner.h for arm64: #include <generic/stage1/json_string_scanner.h> */
/* begin file generic/stage1/json_string_scanner.h for arm64 */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_JSON_STRING_SCANNER_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_JSON_STRING_SCANNER_H */
/* amalgamation skipped (editor-only): #include <generic/stage1/base.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/json_escape_scanner.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace arm64 {
namespace {
namespace stage1 {
struct json_string_block {
// We spell out the constructors in the hope of resolving inlining issues with Visual Studio 2017
simdjson_really_inline json_string_block(uint64_t escaped, uint64_t quote, uint64_t in_string) :
_escaped(escaped), _quote(quote), _in_string(in_string) {}
// Escaped characters (characters following an escape() character)
simdjson_really_inline uint64_t escaped() const { return _escaped; }
// Real (non-backslashed) quotes
simdjson_really_inline uint64_t quote() const { return _quote; }
// Only characters inside the string (not including the quotes)
simdjson_really_inline uint64_t string_content() const { return _in_string & ~_quote; }
// Return a mask of whether the given characters are inside a string (only works on non-quotes)
simdjson_really_inline uint64_t non_quote_inside_string(uint64_t mask) const { return mask & _in_string; }
// Return a mask of whether the given characters are inside a string (only works on non-quotes)
simdjson_really_inline uint64_t non_quote_outside_string(uint64_t mask) const { return mask & ~_in_string; }
// Tail of string (everything except the start quote)
simdjson_really_inline uint64_t string_tail() const { return _in_string ^ _quote; }
// escaped characters (backslashed--does not include the hex characters after \u)
uint64_t _escaped;
// real quotes (non-escaped ones)
uint64_t _quote;
// string characters (includes start quote but not end quote)
uint64_t _in_string;
};
// Scans blocks for string characters, storing the state necessary to do so
class json_string_scanner {
public:
simdjson_really_inline json_string_block next(const simd::simd8x64<uint8_t>& in);
// Returns either UNCLOSED_STRING or SUCCESS
simdjson_really_inline error_code finish();
private:
// Scans for escape characters
json_escape_scanner escape_scanner{};
// Whether the last iteration was still inside a string (all 1's = true, all 0's = false).
uint64_t prev_in_string = 0ULL;
};
//
// Return a mask of all string characters plus end quotes.
//
// prev_escaped is overflow saying whether the next character is escaped.
// prev_in_string is overflow saying whether we're still in a string.
//
// Backslash sequences outside of quotes will be detected in stage 2.
//
simdjson_really_inline json_string_block json_string_scanner::next(const simd::simd8x64<uint8_t>& in) {
const uint64_t backslash = in.eq('\\');
const uint64_t escaped = escape_scanner.next(backslash).escaped;
const uint64_t quote = in.eq('"') & ~escaped;
//
// prefix_xor flips on bits inside the string (and flips off the end quote).
//
// Then we xor with prev_in_string: if we were in a string already, its effect is flipped
// (characters inside strings are outside, and characters outside strings are inside).
//
const uint64_t in_string = prefix_xor(quote) ^ prev_in_string;
//
// Check if we're still in a string at the end of the box so the next block will know
//
prev_in_string = uint64_t(static_cast<int64_t>(in_string) >> 63);
// Use ^ to turn the beginning quote off, and the end quote on.
// We are returning a function-local object so either we get a move constructor
// or we get copy elision.
return json_string_block(escaped, quote, in_string);
}
simdjson_really_inline error_code json_string_scanner::finish() {
if (prev_in_string) {
return UNCLOSED_STRING;
}
return SUCCESS;
}
} // namespace stage1
} // unnamed namespace
} // namespace arm64
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE1_JSON_STRING_SCANNER_H
/* end file generic/stage1/json_string_scanner.h for arm64 */
/* including generic/stage1/utf8_lookup4_algorithm.h for arm64: #include <generic/stage1/utf8_lookup4_algorithm.h> */
/* begin file generic/stage1/utf8_lookup4_algorithm.h for arm64 */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_UTF8_LOOKUP4_ALGORITHM_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_UTF8_LOOKUP4_ALGORITHM_H */
/* amalgamation skipped (editor-only): #include <generic/stage1/base.h> */
/* amalgamation skipped (editor-only): #include <generic/dom_parser_implementation.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace arm64 {
namespace {
namespace utf8_validation {
using namespace simd;
simdjson_inline simd8<uint8_t> check_special_cases(const simd8<uint8_t> input, const simd8<uint8_t> prev1) {
// Bit 0 = Too Short (lead byte/ASCII followed by lead byte/ASCII)
// Bit 1 = Too Long (ASCII followed by continuation)
// Bit 2 = Overlong 3-byte
// Bit 4 = Surrogate
// Bit 5 = Overlong 2-byte
// Bit 7 = Two Continuations
constexpr const uint8_t TOO_SHORT = 1<<0; // 11______ 0_______
// 11______ 11______
constexpr const uint8_t TOO_LONG = 1<<1; // 0_______ 10______
constexpr const uint8_t OVERLONG_3 = 1<<2; // 11100000 100_____
constexpr const uint8_t SURROGATE = 1<<4; // 11101101 101_____
constexpr const uint8_t OVERLONG_2 = 1<<5; // 1100000_ 10______
constexpr const uint8_t TWO_CONTS = 1<<7; // 10______ 10______
constexpr const uint8_t TOO_LARGE = 1<<3; // 11110100 1001____
// 11110100 101_____
// 11110101 1001____
// 11110101 101_____
// 1111011_ 1001____
// 1111011_ 101_____
// 11111___ 1001____
// 11111___ 101_____
constexpr const uint8_t TOO_LARGE_1000 = 1<<6;
// 11110101 1000____
// 1111011_ 1000____
// 11111___ 1000____
constexpr const uint8_t OVERLONG_4 = 1<<6; // 11110000 1000____
const simd8<uint8_t> byte_1_high = prev1.shr<4>().lookup_16<uint8_t>(
// 0_______ ________ <ASCII in byte 1>
TOO_LONG, TOO_LONG, TOO_LONG, TOO_LONG,
TOO_LONG, TOO_LONG, TOO_LONG, TOO_LONG,
// 10______ ________ <continuation in byte 1>
TWO_CONTS, TWO_CONTS, TWO_CONTS, TWO_CONTS,
// 1100____ ________ <two byte lead in byte 1>
TOO_SHORT | OVERLONG_2,
// 1101____ ________ <two byte lead in byte 1>
TOO_SHORT,
// 1110____ ________ <three byte lead in byte 1>
TOO_SHORT | OVERLONG_3 | SURROGATE,
// 1111____ ________ <four+ byte lead in byte 1>
TOO_SHORT | TOO_LARGE | TOO_LARGE_1000 | OVERLONG_4
);
constexpr const uint8_t CARRY = TOO_SHORT | TOO_LONG | TWO_CONTS; // These all have ____ in byte 1 .
const simd8<uint8_t> byte_1_low = (prev1 & 0x0F).lookup_16<uint8_t>(
// ____0000 ________
CARRY | OVERLONG_3 | OVERLONG_2 | OVERLONG_4,
// ____0001 ________
CARRY | OVERLONG_2,
// ____001_ ________
CARRY,
CARRY,
// ____0100 ________
CARRY | TOO_LARGE,
// ____0101 ________
CARRY | TOO_LARGE | TOO_LARGE_1000,
// ____011_ ________
CARRY | TOO_LARGE | TOO_LARGE_1000,
CARRY | TOO_LARGE | TOO_LARGE_1000,
// ____1___ ________
CARRY | TOO_LARGE | TOO_LARGE_1000,
CARRY | TOO_LARGE | TOO_LARGE_1000,
CARRY | TOO_LARGE | TOO_LARGE_1000,
CARRY | TOO_LARGE | TOO_LARGE_1000,
CARRY | TOO_LARGE | TOO_LARGE_1000,
// ____1101 ________
CARRY | TOO_LARGE | TOO_LARGE_1000 | SURROGATE,
CARRY | TOO_LARGE | TOO_LARGE_1000,
CARRY | TOO_LARGE | TOO_LARGE_1000
);
const simd8<uint8_t> byte_2_high = input.shr<4>().lookup_16<uint8_t>(
// ________ 0_______ <ASCII in byte 2>
TOO_SHORT, TOO_SHORT, TOO_SHORT, TOO_SHORT,
TOO_SHORT, TOO_SHORT, TOO_SHORT, TOO_SHORT,
// ________ 1000____
TOO_LONG | OVERLONG_2 | TWO_CONTS | OVERLONG_3 | TOO_LARGE_1000 | OVERLONG_4,
// ________ 1001____
TOO_LONG | OVERLONG_2 | TWO_CONTS | OVERLONG_3 | TOO_LARGE,
// ________ 101_____
TOO_LONG | OVERLONG_2 | TWO_CONTS | SURROGATE | TOO_LARGE,
TOO_LONG | OVERLONG_2 | TWO_CONTS | SURROGATE | TOO_LARGE,
// ________ 11______
TOO_SHORT, TOO_SHORT, TOO_SHORT, TOO_SHORT
);
return (byte_1_high & byte_1_low & byte_2_high);
}
simdjson_inline simd8<uint8_t> check_multibyte_lengths(const simd8<uint8_t> input,
const simd8<uint8_t> prev_input, const simd8<uint8_t> sc) {
simd8<uint8_t> prev2 = input.prev<2>(prev_input);
simd8<uint8_t> prev3 = input.prev<3>(prev_input);
simd8<uint8_t> must23 = must_be_2_3_continuation(prev2, prev3);
simd8<uint8_t> must23_80 = must23 & uint8_t(0x80);
return must23_80 ^ sc;
}
//
// Return nonzero if there are incomplete multibyte characters at the end of the block:
// e.g. if there is a 4-byte character, but it's 3 bytes from the end.
//
simdjson_inline simd8<uint8_t> is_incomplete(const simd8<uint8_t> input) {
// If the previous input's last 3 bytes match this, they're too short (they ended at EOF):
// ... 1111____ 111_____ 11______
#if SIMDJSON_IMPLEMENTATION_ICELAKE
static const uint8_t max_array[64] = {
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 0xf0u-1, 0xe0u-1, 0xc0u-1
};
#else
static const uint8_t max_array[32] = {
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 0xf0u-1, 0xe0u-1, 0xc0u-1
};
#endif
const simd8<uint8_t> max_value(&max_array[sizeof(max_array)-sizeof(simd8<uint8_t>)]);
return input.gt_bits(max_value);
}
struct utf8_checker {
// If this is nonzero, there has been a UTF-8 error.
simd8<uint8_t> error;
// The last input we received
simd8<uint8_t> prev_input_block;
// Whether the last input we received was incomplete (used for ASCII fast path)
simd8<uint8_t> prev_incomplete;
//
// Check whether the current bytes are valid UTF-8.
//
simdjson_inline void check_utf8_bytes(const simd8<uint8_t> input, const simd8<uint8_t> prev_input) {
// Flip prev1...prev3 so we can easily determine if they are 2+, 3+ or 4+ lead bytes
// (2, 3, 4-byte leads become large positive numbers instead of small negative numbers)
simd8<uint8_t> prev1 = input.prev<1>(prev_input);
simd8<uint8_t> sc = check_special_cases(input, prev1);
this->error |= check_multibyte_lengths(input, prev_input, sc);
}
// The only problem that can happen at EOF is that a multibyte character is too short
// or a byte value too large in the last bytes: check_special_cases only checks for bytes
// too large in the first of two bytes.
simdjson_inline void check_eof() {
// If the previous block had incomplete UTF-8 characters at the end, an ASCII block can't
// possibly finish them.
this->error |= this->prev_incomplete;
}
simdjson_inline void check_next_input(const simd8x64<uint8_t>& input) {
if(simdjson_likely(is_ascii(input))) {
this->error |= this->prev_incomplete;
} else {
// you might think that a for-loop would work, but under Visual Studio, it is not good enough.
static_assert((simd8x64<uint8_t>::NUM_CHUNKS == 1)
||(simd8x64<uint8_t>::NUM_CHUNKS == 2)
|| (simd8x64<uint8_t>::NUM_CHUNKS == 4),
"We support one, two or four chunks per 64-byte block.");
SIMDJSON_IF_CONSTEXPR (simd8x64<uint8_t>::NUM_CHUNKS == 1) {
this->check_utf8_bytes(input.chunks[0], this->prev_input_block);
} else SIMDJSON_IF_CONSTEXPR (simd8x64<uint8_t>::NUM_CHUNKS == 2) {
this->check_utf8_bytes(input.chunks[0], this->prev_input_block);
this->check_utf8_bytes(input.chunks[1], input.chunks[0]);
} else SIMDJSON_IF_CONSTEXPR (simd8x64<uint8_t>::NUM_CHUNKS == 4) {
this->check_utf8_bytes(input.chunks[0], this->prev_input_block);
this->check_utf8_bytes(input.chunks[1], input.chunks[0]);
this->check_utf8_bytes(input.chunks[2], input.chunks[1]);
this->check_utf8_bytes(input.chunks[3], input.chunks[2]);
}
this->prev_incomplete = is_incomplete(input.chunks[simd8x64<uint8_t>::NUM_CHUNKS-1]);
this->prev_input_block = input.chunks[simd8x64<uint8_t>::NUM_CHUNKS-1];
}
}
// do not forget to call check_eof!
simdjson_inline error_code errors() {
return this->error.any_bits_set_anywhere() ? error_code::UTF8_ERROR : error_code::SUCCESS;
}
}; // struct utf8_checker
} // namespace utf8_validation
} // unnamed namespace
} // namespace arm64
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE1_UTF8_LOOKUP4_ALGORITHM_H
/* end file generic/stage1/utf8_lookup4_algorithm.h for arm64 */
/* including generic/stage1/json_scanner.h for arm64: #include <generic/stage1/json_scanner.h> */
/* begin file generic/stage1/json_scanner.h for arm64 */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_JSON_SCANNER_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_JSON_SCANNER_H */
/* amalgamation skipped (editor-only): #include <generic/stage1/base.h> */
/* amalgamation skipped (editor-only): #include <generic/json_character_block.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/json_string_scanner.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace arm64 {
namespace {
namespace stage1 {
/**
* A block of scanned json, with information on operators and scalars.
*
* We seek to identify pseudo-structural characters. Anything that is inside
* a string must be omitted (hence & ~_string.string_tail()).
* Otherwise, pseudo-structural characters come in two forms.
* 1. We have the structural characters ([,],{,},:, comma). The
* term 'structural character' is from the JSON RFC.
* 2. We have the 'scalar pseudo-structural characters'.
* Scalars are quotes, and any character except structural characters and white space.
*
* To identify the scalar pseudo-structural characters, we must look at what comes
* before them: it must be a space, a quote or a structural characters.
* Starting with simdjson v0.3, we identify them by
* negation: we identify everything that is followed by a non-quote scalar,
* and we negate that. Whatever remains must be a 'scalar pseudo-structural character'.
*/
struct json_block {
public:
// We spell out the constructors in the hope of resolving inlining issues with Visual Studio 2017
simdjson_inline json_block(json_string_block&& string, json_character_block characters, uint64_t follows_potential_nonquote_scalar) :
_string(std::move(string)), _characters(characters), _follows_potential_nonquote_scalar(follows_potential_nonquote_scalar) {}
simdjson_inline json_block(json_string_block string, json_character_block characters, uint64_t follows_potential_nonquote_scalar) :
_string(string), _characters(characters), _follows_potential_nonquote_scalar(follows_potential_nonquote_scalar) {}
/**
* The start of structurals.
* In simdjson prior to v0.3, these were called the pseudo-structural characters.
**/
simdjson_inline uint64_t structural_start() const noexcept { return potential_structural_start() & ~_string.string_tail(); }
/** All JSON whitespace (i.e. not in a string) */
simdjson_inline uint64_t whitespace() const noexcept { return non_quote_outside_string(_characters.whitespace()); }
// Helpers
/** Whether the given characters are inside a string (only works on non-quotes) */
simdjson_inline uint64_t non_quote_inside_string(uint64_t mask) const noexcept { return _string.non_quote_inside_string(mask); }
/** Whether the given characters are outside a string (only works on non-quotes) */
simdjson_inline uint64_t non_quote_outside_string(uint64_t mask) const noexcept { return _string.non_quote_outside_string(mask); }
// string and escape characters
json_string_block _string;
// whitespace, structural characters ('operators'), scalars
json_character_block _characters;
// whether the previous character was a scalar
uint64_t _follows_potential_nonquote_scalar;
private:
// Potential structurals (i.e. disregarding strings)
/**
* structural elements ([,],{,},:, comma) plus scalar starts like 123, true and "abc".
* They may reside inside a string.
**/
simdjson_inline uint64_t potential_structural_start() const noexcept { return _characters.op() | potential_scalar_start(); }
/**
* The start of non-operator runs, like 123, true and "abc".
* It main reside inside a string.
**/
simdjson_inline uint64_t potential_scalar_start() const noexcept {
// The term "scalar" refers to anything except structural characters and white space
// (so letters, numbers, quotes).
// Whenever it is preceded by something that is not a structural element ({,},[,],:, ") nor a white-space
// then we know that it is irrelevant structurally.
return _characters.scalar() & ~follows_potential_scalar();
}
/**
* Whether the given character is immediately after a non-operator like 123, true.
* The characters following a quote are not included.
*/
simdjson_inline uint64_t follows_potential_scalar() const noexcept {
// _follows_potential_nonquote_scalar: is defined as marking any character that follows a character
// that is not a structural element ({,},[,],:, comma) nor a quote (") and that is not a
// white space.
// It is understood that within quoted region, anything at all could be marked (irrelevant).
return _follows_potential_nonquote_scalar;
}
};
/**
* Scans JSON for important bits: structural characters or 'operators', strings, and scalars.
*
* The scanner starts by calculating two distinct things:
* - string characters (taking \" into account)
* - structural characters or 'operators' ([]{},:, comma)
* and scalars (runs of non-operators like 123, true and "abc")
*
* To minimize data dependency (a key component of the scanner's speed), it finds these in parallel:
* in particular, the operator/scalar bit will find plenty of things that are actually part of
* strings. When we're done, json_block will fuse the two together by masking out tokens that are
* part of a string.
*/
class json_scanner {
public:
json_scanner() = default;
simdjson_inline json_block next(const simd::simd8x64<uint8_t>& in);
// Returns either UNCLOSED_STRING or SUCCESS
simdjson_inline error_code finish();
private:
// Whether the last character of the previous iteration is part of a scalar token
// (anything except whitespace or a structural character/'operator').
uint64_t prev_scalar = 0ULL;
json_string_scanner string_scanner{};
};
//
// Check if the current character immediately follows a matching character.
//
// For example, this checks for quotes with backslashes in front of them:
//
// const uint64_t backslashed_quote = in.eq('"') & immediately_follows(in.eq('\'), prev_backslash);
//
simdjson_inline uint64_t follows(const uint64_t match, uint64_t &overflow) {
const uint64_t result = match << 1 | overflow;
overflow = match >> 63;
return result;
}
simdjson_inline json_block json_scanner::next(const simd::simd8x64<uint8_t>& in) {
json_string_block strings = string_scanner.next(in);
// identifies the white-space and the structural characters
json_character_block characters = json_character_block::classify(in);
// The term "scalar" refers to anything except structural characters and white space
// (so letters, numbers, quotes).
// We want follows_scalar to mark anything that follows a non-quote scalar (so letters and numbers).
//
// A terminal quote should either be followed by a structural character (comma, brace, bracket, colon)
// or nothing. However, we still want ' "a string"true ' to mark the 't' of 'true' as a potential
// pseudo-structural character just like we would if we had ' "a string" true '; otherwise we
// may need to add an extra check when parsing strings.
//
// Performance: there are many ways to skin this cat.
const uint64_t nonquote_scalar = characters.scalar() & ~strings.quote();
uint64_t follows_nonquote_scalar = follows(nonquote_scalar, prev_scalar);
// We are returning a function-local object so either we get a move constructor
// or we get copy elision.
return json_block(
strings,// strings is a function-local object so either it moves or the copy is elided.
characters,
follows_nonquote_scalar
);
}
simdjson_inline error_code json_scanner::finish() {
return string_scanner.finish();
}
} // namespace stage1
} // unnamed namespace
} // namespace arm64
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE1_JSON_SCANNER_H
/* end file generic/stage1/json_scanner.h for arm64 */
// All other declarations
/* including generic/stage1/find_next_document_index.h for arm64: #include <generic/stage1/find_next_document_index.h> */
/* begin file generic/stage1/find_next_document_index.h for arm64 */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_FIND_NEXT_DOCUMENT_INDEX_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_FIND_NEXT_DOCUMENT_INDEX_H */
/* amalgamation skipped (editor-only): #include <generic/stage1/base.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/dom_parser_implementation.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace arm64 {
namespace {
namespace stage1 {
/**
* This algorithm is used to quickly identify the last structural position that
* makes up a complete document.
*
* It does this by going backwards and finding the last *document boundary* (a
* place where one value follows another without a comma between them). If the
* last document (the characters after the boundary) has an equal number of
* start and end brackets, it is considered complete.
*
* Simply put, we iterate over the structural characters, starting from
* the end. We consider that we found the end of a JSON document when the
* first element of the pair is NOT one of these characters: '{' '[' ':' ','
* and when the second element is NOT one of these characters: '}' ']' ':' ','.
*
* This simple comparison works most of the time, but it does not cover cases
* where the batch's structural indexes contain a perfect amount of documents.
* In such a case, we do not have access to the structural index which follows
* the last document, therefore, we do not have access to the second element in
* the pair, and that means we cannot identify the last document. To fix this
* issue, we keep a count of the open and closed curly/square braces we found
* while searching for the pair. When we find a pair AND the count of open and
* closed curly/square braces is the same, we know that we just passed a
* complete document, therefore the last json buffer location is the end of the
* batch.
*/
simdjson_inline uint32_t find_next_document_index(dom_parser_implementation &parser) {
// Variant: do not count separately, just figure out depth
if(parser.n_structural_indexes == 0) { return 0; }
auto arr_cnt = 0;
auto obj_cnt = 0;
for (auto i = parser.n_structural_indexes - 1; i > 0; i--) {
auto idxb = parser.structural_indexes[i];
switch (parser.buf[idxb]) {
case ':':
case ',':
continue;
case '}':
obj_cnt--;
continue;
case ']':
arr_cnt--;
continue;
case '{':
obj_cnt++;
break;
case '[':
arr_cnt++;
break;
}
auto idxa = parser.structural_indexes[i - 1];
switch (parser.buf[idxa]) {
case '{':
case '[':
case ':':
case ',':
continue;
}
// Last document is complete, so the next document will appear after!
if (!arr_cnt && !obj_cnt) {
return parser.n_structural_indexes;
}
// Last document is incomplete; mark the document at i + 1 as the next one
return i;
}
// If we made it to the end, we want to finish counting to see if we have a full document.
switch (parser.buf[parser.structural_indexes[0]]) {
case '}':
obj_cnt--;
break;
case ']':
arr_cnt--;
break;
case '{':
obj_cnt++;
break;
case '[':
arr_cnt++;
break;
}
if (!arr_cnt && !obj_cnt) {
// We have a complete document.
return parser.n_structural_indexes;
}
return 0;
}
} // namespace stage1
} // unnamed namespace
} // namespace arm64
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE1_FIND_NEXT_DOCUMENT_INDEX_H
/* end file generic/stage1/find_next_document_index.h for arm64 */
/* including generic/stage1/json_minifier.h for arm64: #include <generic/stage1/json_minifier.h> */
/* begin file generic/stage1/json_minifier.h for arm64 */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_JSON_MINIFIER_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_JSON_MINIFIER_H */
/* amalgamation skipped (editor-only): #include <generic/stage1/base.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/json_scanner.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/buf_block_reader.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
// This file contains the common code every implementation uses in stage1
// It is intended to be included multiple times and compiled multiple times
// We assume the file in which it is included already includes
// "simdjson/stage1.h" (this simplifies amalgation)
namespace simdjson {
namespace arm64 {
namespace {
namespace stage1 {
class json_minifier {
public:
template<size_t STEP_SIZE>
static error_code minify(const uint8_t *buf, size_t len, uint8_t *dst, size_t &dst_len) noexcept;
private:
simdjson_inline json_minifier(uint8_t *_dst)
: dst{_dst}
{}
template<size_t STEP_SIZE>
simdjson_inline void step(const uint8_t *block_buf, buf_block_reader<STEP_SIZE> &reader) noexcept;
simdjson_inline void next(const simd::simd8x64<uint8_t>& in, const json_block& block);
simdjson_inline error_code finish(uint8_t *dst_start, size_t &dst_len);
json_scanner scanner{};
uint8_t *dst;
};
simdjson_inline void json_minifier::next(const simd::simd8x64<uint8_t>& in, const json_block& block) {
uint64_t mask = block.whitespace();
dst += in.compress(mask, dst);
}
simdjson_inline error_code json_minifier::finish(uint8_t *dst_start, size_t &dst_len) {
error_code error = scanner.finish();
if (error) { dst_len = 0; return error; }
dst_len = dst - dst_start;
return SUCCESS;
}
template<>
simdjson_inline void json_minifier::step<128>(const uint8_t *block_buf, buf_block_reader<128> &reader) noexcept {
simd::simd8x64<uint8_t> in_1(block_buf);
simd::simd8x64<uint8_t> in_2(block_buf+64);
json_block block_1 = scanner.next(in_1);
json_block block_2 = scanner.next(in_2);
this->next(in_1, block_1);
this->next(in_2, block_2);
reader.advance();
}
template<>
simdjson_inline void json_minifier::step<64>(const uint8_t *block_buf, buf_block_reader<64> &reader) noexcept {
simd::simd8x64<uint8_t> in_1(block_buf);
json_block block_1 = scanner.next(in_1);
this->next(block_buf, block_1);
reader.advance();
}
template<size_t STEP_SIZE>
error_code json_minifier::minify(const uint8_t *buf, size_t len, uint8_t *dst, size_t &dst_len) noexcept {
buf_block_reader<STEP_SIZE> reader(buf, len);
json_minifier minifier(dst);
// Index the first n-1 blocks
while (reader.has_full_block()) {
minifier.step<STEP_SIZE>(reader.full_block(), reader);
}
// Index the last (remainder) block, padded with spaces
uint8_t block[STEP_SIZE];
size_t remaining_bytes = reader.get_remainder(block);
if (remaining_bytes > 0) {
// We do not want to write directly to the output stream. Rather, we write
// to a local buffer (for safety).
uint8_t out_block[STEP_SIZE];
uint8_t * const guarded_dst{minifier.dst};
minifier.dst = out_block;
minifier.step<STEP_SIZE>(block, reader);
size_t to_write = minifier.dst - out_block;
// In some cases, we could be enticed to consider the padded spaces
// as part of the string. This is fine as long as we do not write more
// than we consumed.
if(to_write > remaining_bytes) { to_write = remaining_bytes; }
memcpy(guarded_dst, out_block, to_write);
minifier.dst = guarded_dst + to_write;
}
return minifier.finish(dst, dst_len);
}
} // namespace stage1
} // unnamed namespace
} // namespace arm64
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE1_JSON_MINIFIER_H
/* end file generic/stage1/json_minifier.h for arm64 */
/* including generic/stage1/json_structural_indexer.h for arm64: #include <generic/stage1/json_structural_indexer.h> */
/* begin file generic/stage1/json_structural_indexer.h for arm64 */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_JSON_STRUCTURAL_INDEXER_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_JSON_STRUCTURAL_INDEXER_H */
/* amalgamation skipped (editor-only): #include <generic/stage1/base.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/utf8_lookup4_algorithm.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/buf_block_reader.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/json_string_scanner.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/json_scanner.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/json_minifier.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/find_next_document_index.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
// This file contains the common code every implementation uses in stage1
// It is intended to be included multiple times and compiled multiple times
// We assume the file in which it is included already includes
// "simdjson/stage1.h" (this simplifies amalgation)
namespace simdjson {
namespace arm64 {
namespace {
namespace stage1 {
class bit_indexer {
public:
uint32_t *tail;
simdjson_inline bit_indexer(uint32_t *index_buf) : tail(index_buf) {}
#if SIMDJSON_PREFER_REVERSE_BITS
/**
* ARM lacks a fast trailing zero instruction, but it has a fast
* bit reversal instruction and a fast leading zero instruction.
* Thus it may be profitable to reverse the bits (once) and then
* to rely on a sequence of instructions that call the leading
* zero instruction.
*
* Performance notes:
* The chosen routine is not optimal in terms of data dependency
* since zero_leading_bit might require two instructions. However,
* it tends to minimize the total number of instructions which is
* beneficial.
*/
simdjson_inline void write_index(uint32_t idx, uint64_t& rev_bits, int i) {
int lz = leading_zeroes(rev_bits);
this->tail[i] = static_cast<uint32_t>(idx) + lz;
rev_bits = zero_leading_bit(rev_bits, lz);
}
#else
/**
* Under recent x64 systems, we often have both a fast trailing zero
* instruction and a fast 'clear-lower-bit' instruction so the following
* algorithm can be competitive.
*/
simdjson_inline void write_index(uint32_t idx, uint64_t& bits, int i) {
this->tail[i] = idx + trailing_zeroes(bits);
bits = clear_lowest_bit(bits);
}
#endif // SIMDJSON_PREFER_REVERSE_BITS
template <int START, int N>
simdjson_inline int write_indexes(uint32_t idx, uint64_t& bits) {
write_index(idx, bits, START);
SIMDJSON_IF_CONSTEXPR (N > 1) {
write_indexes<(N-1>0?START+1:START), (N-1>=0?N-1:1)>(idx, bits);
}
return START+N;
}
template <int START, int END, int STEP>
simdjson_inline int write_indexes_stepped(uint32_t idx, uint64_t& bits, int cnt) {
write_indexes<START, STEP>(idx, bits);
SIMDJSON_IF_CONSTEXPR ((START+STEP) < END) {
if (simdjson_unlikely((START+STEP) < cnt)) {
write_indexes_stepped<(START+STEP<END?START+STEP:END), END, STEP>(idx, bits, cnt);
}
}
return ((END-START) % STEP) == 0 ? END : (END-START) - ((END-START) % STEP) + STEP;
}
// flatten out values in 'bits' assuming that they are are to have values of idx
// plus their position in the bitvector, and store these indexes at
// base_ptr[base] incrementing base as we go
// will potentially store extra values beyond end of valid bits, so base_ptr
// needs to be large enough to handle this
//
// If the kernel sets SIMDJSON_GENERIC_JSON_STRUCTURAL_INDEXER_CUSTOM_BIT_INDEXER, then it
// will provide its own version of the code.
#ifdef SIMDJSON_GENERIC_JSON_STRUCTURAL_INDEXER_CUSTOM_BIT_INDEXER
simdjson_inline void write(uint32_t idx, uint64_t bits);
#else
simdjson_inline void write(uint32_t idx, uint64_t bits) {
// In some instances, the next branch is expensive because it is mispredicted.
// Unfortunately, in other cases,
// it helps tremendously.
if (bits == 0)
return;
int cnt = static_cast<int>(count_ones(bits));
#if SIMDJSON_PREFER_REVERSE_BITS
bits = reverse_bits(bits);
#endif
#ifdef SIMDJSON_STRUCTURAL_INDEXER_STEP
static constexpr const int STEP = SIMDJSON_STRUCTURAL_INDEXER_STEP;
#else
static constexpr const int STEP = 4;
#endif
static constexpr const int STEP_UNTIL = 24;
write_indexes_stepped<0, STEP_UNTIL, STEP>(idx, bits, cnt);
SIMDJSON_IF_CONSTEXPR (STEP_UNTIL < 64) {
if (simdjson_unlikely(STEP_UNTIL < cnt)) {
for (int i=STEP_UNTIL; i<cnt; i++) {
write_index(idx, bits, i);
}
}
}
this->tail += cnt;
}
#endif // SIMDJSON_GENERIC_JSON_STRUCTURAL_INDEXER_CUSTOM_BIT_INDEXER
};
class json_structural_indexer {
public:
/**
* Find the important bits of JSON in a 128-byte chunk, and add them to structural_indexes.
*
* @param partial Setting the partial parameter to true allows the find_structural_bits to
* tolerate unclosed strings. The caller should still ensure that the input is valid UTF-8. If
* you are processing substrings, you may want to call on a function like trimmed_length_safe_utf8.
*/
template<size_t STEP_SIZE>
static error_code index(const uint8_t *buf, size_t len, dom_parser_implementation &parser, stage1_mode partial) noexcept;
private:
simdjson_inline json_structural_indexer(uint32_t *structural_indexes);
template<size_t STEP_SIZE>
simdjson_inline void step(const uint8_t *block, buf_block_reader<STEP_SIZE> &reader) noexcept;
simdjson_inline void next(const simd::simd8x64<uint8_t>& in, const json_block& block, size_t idx);
simdjson_inline error_code finish(dom_parser_implementation &parser, size_t idx, size_t len, stage1_mode partial);
json_scanner scanner{};
utf8_checker checker{};
bit_indexer indexer;
uint64_t prev_structurals = 0;
uint64_t unescaped_chars_error = 0;
};
simdjson_inline json_structural_indexer::json_structural_indexer(uint32_t *structural_indexes) : indexer{structural_indexes} {}
// Skip the last character if it is partial
simdjson_inline size_t trim_partial_utf8(const uint8_t *buf, size_t len) {
if (simdjson_unlikely(len < 3)) {
switch (len) {
case 2:
if (buf[len-1] >= 0xc0) { return len-1; } // 2-, 3- and 4-byte characters with only 1 byte left
if (buf[len-2] >= 0xe0) { return len-2; } // 3- and 4-byte characters with only 2 bytes left
return len;
case 1:
if (buf[len-1] >= 0xc0) { return len-1; } // 2-, 3- and 4-byte characters with only 1 byte left
return len;
case 0:
return len;
}
}
if (buf[len-1] >= 0xc0) { return len-1; } // 2-, 3- and 4-byte characters with only 1 byte left
if (buf[len-2] >= 0xe0) { return len-2; } // 3- and 4-byte characters with only 1 byte left
if (buf[len-3] >= 0xf0) { return len-3; } // 4-byte characters with only 3 bytes left
return len;
}
//
// PERF NOTES:
// We pipe 2 inputs through these stages:
// 1. Load JSON into registers. This takes a long time and is highly parallelizable, so we load
// 2 inputs' worth at once so that by the time step 2 is looking for them input, it's available.
// 2. Scan the JSON for critical data: strings, scalars and operators. This is the critical path.
// The output of step 1 depends entirely on this information. These functions don't quite use
// up enough CPU: the second half of the functions is highly serial, only using 1 execution core
// at a time. The second input's scans has some dependency on the first ones finishing it, but
// they can make a lot of progress before they need that information.
// 3. Step 1 does not use enough capacity, so we run some extra stuff while we're waiting for that
// to finish: utf-8 checks and generating the output from the last iteration.
//
// The reason we run 2 inputs at a time, is steps 2 and 3 are *still* not enough to soak up all
// available capacity with just one input. Running 2 at a time seems to give the CPU a good enough
// workout.
//
template<size_t STEP_SIZE>
error_code json_structural_indexer::index(const uint8_t *buf, size_t len, dom_parser_implementation &parser, stage1_mode partial) noexcept {
if (simdjson_unlikely(len > parser.capacity())) { return CAPACITY; }
// We guard the rest of the code so that we can assume that len > 0 throughout.
if (len == 0) { return EMPTY; }
if (is_streaming(partial)) {
len = trim_partial_utf8(buf, len);
// If you end up with an empty window after trimming
// the partial UTF-8 bytes, then chances are good that you
// have an UTF-8 formatting error.
if(len == 0) { return UTF8_ERROR; }
}
buf_block_reader<STEP_SIZE> reader(buf, len);
json_structural_indexer indexer(parser.structural_indexes.get());
// Read all but the last block
while (reader.has_full_block()) {
indexer.step<STEP_SIZE>(reader.full_block(), reader);
}
// Take care of the last block (will always be there unless file is empty which is
// not supposed to happen.)
uint8_t block[STEP_SIZE];
if (simdjson_unlikely(reader.get_remainder(block) == 0)) { return UNEXPECTED_ERROR; }
indexer.step<STEP_SIZE>(block, reader);
return indexer.finish(parser, reader.block_index(), len, partial);
}
template<>
simdjson_inline void json_structural_indexer::step<128>(const uint8_t *block, buf_block_reader<128> &reader) noexcept {
simd::simd8x64<uint8_t> in_1(block);
simd::simd8x64<uint8_t> in_2(block+64);
json_block block_1 = scanner.next(in_1);
json_block block_2 = scanner.next(in_2);
this->next(in_1, block_1, reader.block_index());
this->next(in_2, block_2, reader.block_index()+64);
reader.advance();
}
template<>
simdjson_inline void json_structural_indexer::step<64>(const uint8_t *block, buf_block_reader<64> &reader) noexcept {
simd::simd8x64<uint8_t> in_1(block);
json_block block_1 = scanner.next(in_1);
this->next(in_1, block_1, reader.block_index());
reader.advance();
}
simdjson_inline void json_structural_indexer::next(const simd::simd8x64<uint8_t>& in, const json_block& block, size_t idx) {
uint64_t unescaped = in.lteq(0x1F);
#if SIMDJSON_UTF8VALIDATION
checker.check_next_input(in);
#endif
indexer.write(uint32_t(idx-64), prev_structurals); // Output *last* iteration's structurals to the parser
prev_structurals = block.structural_start();
unescaped_chars_error |= block.non_quote_inside_string(unescaped);
}
simdjson_inline error_code json_structural_indexer::finish(dom_parser_implementation &parser, size_t idx, size_t len, stage1_mode partial) {
// Write out the final iteration's structurals
indexer.write(uint32_t(idx-64), prev_structurals);
error_code error = scanner.finish();
// We deliberately break down the next expression so that it is
// human readable.
const bool should_we_exit = is_streaming(partial) ?
((error != SUCCESS) && (error != UNCLOSED_STRING)) // when partial we tolerate UNCLOSED_STRING
: (error != SUCCESS); // if partial is false, we must have SUCCESS
const bool have_unclosed_string = (error == UNCLOSED_STRING);
if (simdjson_unlikely(should_we_exit)) { return error; }
if (unescaped_chars_error) {
return UNESCAPED_CHARS;
}
parser.n_structural_indexes = uint32_t(indexer.tail - parser.structural_indexes.get());
/***
* The On Demand API requires special padding.
*
* This is related to https://github.com/simdjson/simdjson/issues/906
* Basically, we want to make sure that if the parsing continues beyond the last (valid)
* structural character, it quickly stops.
* Only three structural characters can be repeated without triggering an error in JSON: [,] and }.
* We repeat the padding character (at 'len'). We don't know what it is, but if the parsing
* continues, then it must be [,] or }.
* Suppose it is ] or }. We backtrack to the first character, what could it be that would
* not trigger an error? It could be ] or } but no, because you can't start a document that way.
* It can't be a comma, a colon or any simple value. So the only way we could continue is
* if the repeated character is [. But if so, the document must start with [. But if the document
* starts with [, it should end with ]. If we enforce that rule, then we would get
* ][[ which is invalid.
*
* This is illustrated with the test array_iterate_unclosed_error() on the following input:
* R"({ "a": [,,)"
**/
parser.structural_indexes[parser.n_structural_indexes] = uint32_t(len); // used later in partial == stage1_mode::streaming_final
parser.structural_indexes[parser.n_structural_indexes + 1] = uint32_t(len);
parser.structural_indexes[parser.n_structural_indexes + 2] = 0;
parser.next_structural_index = 0;
// a valid JSON file cannot have zero structural indexes - we should have found something
if (simdjson_unlikely(parser.n_structural_indexes == 0u)) {
return EMPTY;
}
if (simdjson_unlikely(parser.structural_indexes[parser.n_structural_indexes - 1] > len)) {
return UNEXPECTED_ERROR;
}
if (partial == stage1_mode::streaming_partial) {
// If we have an unclosed string, then the last structural
// will be the quote and we want to make sure to omit it.
if(have_unclosed_string) {
parser.n_structural_indexes--;
// a valid JSON file cannot have zero structural indexes - we should have found something
if (simdjson_unlikely(parser.n_structural_indexes == 0u)) { return CAPACITY; }
}
// We truncate the input to the end of the last complete document (or zero).
auto new_structural_indexes = find_next_document_index(parser);
if (new_structural_indexes == 0 && parser.n_structural_indexes > 0) {
if(parser.structural_indexes[0] == 0) {
// If the buffer is partial and we started at index 0 but the document is
// incomplete, it's too big to parse.
return CAPACITY;
} else {
// It is possible that the document could be parsed, we just had a lot
// of white space.
parser.n_structural_indexes = 0;
return EMPTY;
}
}
parser.n_structural_indexes = new_structural_indexes;
} else if (partial == stage1_mode::streaming_final) {
if(have_unclosed_string) { parser.n_structural_indexes--; }
// We truncate the input to the end of the last complete document (or zero).
// Because partial == stage1_mode::streaming_final, it means that we may
// silently ignore trailing garbage. Though it sounds bad, we do it
// deliberately because many people who have streams of JSON documents
// will truncate them for processing. E.g., imagine that you are uncompressing
// the data from a size file or receiving it in chunks from the network. You
// may not know where exactly the last document will be. Meanwhile the
// document_stream instances allow people to know the JSON documents they are
// parsing (see the iterator.source() method).
parser.n_structural_indexes = find_next_document_index(parser);
// We store the initial n_structural_indexes so that the client can see
// whether we used truncation. If initial_n_structural_indexes == parser.n_structural_indexes,
// then this will query parser.structural_indexes[parser.n_structural_indexes] which is len,
// otherwise, it will copy some prior index.
parser.structural_indexes[parser.n_structural_indexes + 1] = parser.structural_indexes[parser.n_structural_indexes];
// This next line is critical, do not change it unless you understand what you are
// doing.
parser.structural_indexes[parser.n_structural_indexes] = uint32_t(len);
if (simdjson_unlikely(parser.n_structural_indexes == 0u)) {
// We tolerate an unclosed string at the very end of the stream. Indeed, users
// often load their data in bulk without being careful and they want us to ignore
// the trailing garbage.
return EMPTY;
}
}
checker.check_eof();
return checker.errors();
}
} // namespace stage1
} // unnamed namespace
} // namespace arm64
} // namespace simdjson
// Clear CUSTOM_BIT_INDEXER so other implementations can set it if they need to.
#undef SIMDJSON_GENERIC_JSON_STRUCTURAL_INDEXER_CUSTOM_BIT_INDEXER
#endif // SIMDJSON_SRC_GENERIC_STAGE1_JSON_STRUCTURAL_INDEXER_H
/* end file generic/stage1/json_structural_indexer.h for arm64 */
/* including generic/stage1/utf8_validator.h for arm64: #include <generic/stage1/utf8_validator.h> */
/* begin file generic/stage1/utf8_validator.h for arm64 */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_UTF8_VALIDATOR_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_UTF8_VALIDATOR_H */
/* amalgamation skipped (editor-only): #include <generic/stage1/base.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/buf_block_reader.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/utf8_lookup4_algorithm.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace arm64 {
namespace {
namespace stage1 {
/**
* Validates that the string is actual UTF-8.
*/
template<class checker>
bool generic_validate_utf8(const uint8_t * input, size_t length) {
checker c{};
buf_block_reader<64> reader(input, length);
while (reader.has_full_block()) {
simd::simd8x64<uint8_t> in(reader.full_block());
c.check_next_input(in);
reader.advance();
}
uint8_t block[64]{};
reader.get_remainder(block);
simd::simd8x64<uint8_t> in(block);
c.check_next_input(in);
reader.advance();
c.check_eof();
return c.errors() == error_code::SUCCESS;
}
bool generic_validate_utf8(const char * input, size_t length) {
return generic_validate_utf8<utf8_checker>(reinterpret_cast<const uint8_t *>(input),length);
}
} // namespace stage1
} // unnamed namespace
} // namespace arm64
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE1_UTF8_VALIDATOR_H
/* end file generic/stage1/utf8_validator.h for arm64 */
/* end file generic/stage1/amalgamated.h for arm64 */
/* including generic/stage2/amalgamated.h for arm64: #include <generic/stage2/amalgamated.h> */
/* begin file generic/stage2/amalgamated.h for arm64 */
// Stuff other things depend on
/* including generic/stage2/base.h for arm64: #include <generic/stage2/base.h> */
/* begin file generic/stage2/base.h for arm64 */
#ifndef SIMDJSON_SRC_GENERIC_STAGE2_BASE_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE2_BASE_H */
/* amalgamation skipped (editor-only): #include <generic/base.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace arm64 {
namespace {
namespace stage2 {
class json_iterator;
class structural_iterator;
struct tape_builder;
struct tape_writer;
} // namespace stage2
} // unnamed namespace
} // namespace arm64
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE2_BASE_H
/* end file generic/stage2/base.h for arm64 */
/* including generic/stage2/tape_writer.h for arm64: #include <generic/stage2/tape_writer.h> */
/* begin file generic/stage2/tape_writer.h for arm64 */
#ifndef SIMDJSON_SRC_GENERIC_STAGE2_TAPE_WRITER_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE2_TAPE_WRITER_H */
/* amalgamation skipped (editor-only): #include <generic/stage2/base.h> */
/* amalgamation skipped (editor-only): #include <simdjson/internal/tape_type.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#include <cstring>
namespace simdjson {
namespace arm64 {
namespace {
namespace stage2 {
struct tape_writer {
/** The next place to write to tape */
uint64_t *next_tape_loc;
/** Write a signed 64-bit value to tape. */
simdjson_inline void append_s64(int64_t value) noexcept;
/** Write an unsigned 64-bit value to tape. */
simdjson_inline void append_u64(uint64_t value) noexcept;
/** Write a double value to tape. */
simdjson_inline void append_double(double value) noexcept;
/**
* Append a tape entry (an 8-bit type,and 56 bits worth of value).
*/
simdjson_inline void append(uint64_t val, internal::tape_type t) noexcept;
/**
* Skip the current tape entry without writing.
*
* Used to skip the start of the container, since we'll come back later to fill it in when the
* container ends.
*/
simdjson_inline void skip() noexcept;
/**
* Skip the number of tape entries necessary to write a large u64 or i64.
*/
simdjson_inline void skip_large_integer() noexcept;
/**
* Skip the number of tape entries necessary to write a double.
*/
simdjson_inline void skip_double() noexcept;
/**
* Write a value to a known location on tape.
*
* Used to go back and write out the start of a container after the container ends.
*/
simdjson_inline static void write(uint64_t &tape_loc, uint64_t val, internal::tape_type t) noexcept;
private:
/**
* Append both the tape entry, and a supplementary value following it. Used for types that need
* all 64 bits, such as double and uint64_t.
*/
template<typename T>
simdjson_inline void append2(uint64_t val, T val2, internal::tape_type t) noexcept;
}; // struct tape_writer
simdjson_inline void tape_writer::append_s64(int64_t value) noexcept {
append2(0, value, internal::tape_type::INT64);
}
simdjson_inline void tape_writer::append_u64(uint64_t value) noexcept {
append(0, internal::tape_type::UINT64);
*next_tape_loc = value;
next_tape_loc++;
}
/** Write a double value to tape. */
simdjson_inline void tape_writer::append_double(double value) noexcept {
append2(0, value, internal::tape_type::DOUBLE);
}
simdjson_inline void tape_writer::skip() noexcept {
next_tape_loc++;
}
simdjson_inline void tape_writer::skip_large_integer() noexcept {
next_tape_loc += 2;
}
simdjson_inline void tape_writer::skip_double() noexcept {
next_tape_loc += 2;
}
simdjson_inline void tape_writer::append(uint64_t val, internal::tape_type t) noexcept {
*next_tape_loc = val | ((uint64_t(char(t))) << 56);
next_tape_loc++;
}
template<typename T>
simdjson_inline void tape_writer::append2(uint64_t val, T val2, internal::tape_type t) noexcept {
append(val, t);
static_assert(sizeof(val2) == sizeof(*next_tape_loc), "Type is not 64 bits!");
memcpy(next_tape_loc, &val2, sizeof(val2));
next_tape_loc++;
}
simdjson_inline void tape_writer::write(uint64_t &tape_loc, uint64_t val, internal::tape_type t) noexcept {
tape_loc = val | ((uint64_t(char(t))) << 56);
}
} // namespace stage2
} // unnamed namespace
} // namespace arm64
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE2_TAPE_WRITER_H
/* end file generic/stage2/tape_writer.h for arm64 */
/* including generic/stage2/logger.h for arm64: #include <generic/stage2/logger.h> */
/* begin file generic/stage2/logger.h for arm64 */
#ifndef SIMDJSON_SRC_GENERIC_STAGE2_LOGGER_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE2_LOGGER_H */
/* amalgamation skipped (editor-only): #include <generic/stage2/base.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#include <cstring>
// This is for an internal-only stage 2 specific logger.
// Set LOG_ENABLED = true to log what stage 2 is doing!
namespace simdjson {
namespace arm64 {
namespace {
namespace logger {
static constexpr const char * DASHES = "----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------";
#if SIMDJSON_VERBOSE_LOGGING
static constexpr const bool LOG_ENABLED = true;
#else
static constexpr const bool LOG_ENABLED = false;
#endif
static constexpr const int LOG_EVENT_LEN = 20;
static constexpr const int LOG_BUFFER_LEN = 30;
static constexpr const int LOG_SMALL_BUFFER_LEN = 10;
static constexpr const int LOG_INDEX_LEN = 5;
static int log_depth; // Not threadsafe. Log only.
// Helper to turn unprintable or newline characters into spaces
static simdjson_inline char printable_char(char c) {
if (c >= 0x20) {
return c;
} else {
return ' ';
}
}
// Print the header and set up log_start
static simdjson_inline void log_start() {
if (LOG_ENABLED) {
log_depth = 0;
printf("\n");
printf("| %-*s | %-*s | %-*s | %-*s | Detail |\n", LOG_EVENT_LEN, "Event", LOG_BUFFER_LEN, "Buffer", LOG_SMALL_BUFFER_LEN, "Next", 5, "Next#");
printf("|%.*s|%.*s|%.*s|%.*s|--------|\n", LOG_EVENT_LEN+2, DASHES, LOG_BUFFER_LEN+2, DASHES, LOG_SMALL_BUFFER_LEN+2, DASHES, 5+2, DASHES);
}
}
simdjson_unused static simdjson_inline void log_string(const char *message) {
if (LOG_ENABLED) {
printf("%s\n", message);
}
}
// Logs a single line from the stage 2 DOM parser
template<typename S>
static simdjson_inline void log_line(S &structurals, const char *title_prefix, const char *title, const char *detail) {
if (LOG_ENABLED) {
printf("| %*s%s%-*s ", log_depth*2, "", title_prefix, LOG_EVENT_LEN - log_depth*2 - int(strlen(title_prefix)), title);
auto current_index = structurals.at_beginning() ? nullptr : structurals.next_structural-1;
auto next_index = structurals.next_structural;
auto current = current_index ? &structurals.buf[*current_index] : reinterpret_cast<const uint8_t*>(" ");
auto next = &structurals.buf[*next_index];
{
// Print the next N characters in the buffer.
printf("| ");
// Otherwise, print the characters starting from the buffer position.
// Print spaces for unprintable or newline characters.
for (int i=0;i<LOG_BUFFER_LEN;i++) {
printf("%c", printable_char(current[i]));
}
printf(" ");
// Print the next N characters in the buffer.
printf("| ");
// Otherwise, print the characters starting from the buffer position.
// Print spaces for unprintable or newline characters.
for (int i=0;i<LOG_SMALL_BUFFER_LEN;i++) {
printf("%c", printable_char(next[i]));
}
printf(" ");
}
if (current_index) {
printf("| %*u ", LOG_INDEX_LEN, *current_index);
} else {
printf("| %-*s ", LOG_INDEX_LEN, "");
}
// printf("| %*u ", LOG_INDEX_LEN, structurals.next_tape_index());
printf("| %-s ", detail);
printf("|\n");
}
}
} // namespace logger
} // unnamed namespace
} // namespace arm64
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE2_LOGGER_H
/* end file generic/stage2/logger.h for arm64 */
// All other declarations
/* including generic/stage2/json_iterator.h for arm64: #include <generic/stage2/json_iterator.h> */
/* begin file generic/stage2/json_iterator.h for arm64 */
#ifndef SIMDJSON_SRC_GENERIC_STAGE2_JSON_ITERATOR_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE2_JSON_ITERATOR_H */
/* amalgamation skipped (editor-only): #include <generic/stage2/base.h> */
/* amalgamation skipped (editor-only): #include <generic/stage2/logger.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/dom_parser_implementation.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace arm64 {
namespace {
namespace stage2 {
class json_iterator {
public:
const uint8_t* const buf;
uint32_t *next_structural;
dom_parser_implementation &dom_parser;
uint32_t depth{0};
/**
* Walk the JSON document.
*
* The visitor receives callbacks when values are encountered. All callbacks pass the iterator as
* the first parameter; some callbacks have other parameters as well:
*
* - visit_document_start() - at the beginning.
* - visit_document_end() - at the end (if things were successful).
*
* - visit_array_start() - at the start `[` of a non-empty array.
* - visit_array_end() - at the end `]` of a non-empty array.
* - visit_empty_array() - when an empty array is encountered.
*
* - visit_object_end() - at the start `]` of a non-empty object.
* - visit_object_start() - at the end `]` of a non-empty object.
* - visit_empty_object() - when an empty object is encountered.
* - visit_key(const uint8_t *key) - when a key in an object field is encountered. key is
* guaranteed to point at the first quote of the string (`"key"`).
* - visit_primitive(const uint8_t *value) - when a value is a string, number, boolean or null.
* - visit_root_primitive(iter, uint8_t *value) - when the top-level value is a string, number, boolean or null.
*
* - increment_count(iter) - each time a value is found in an array or object.
*/
template<bool STREAMING, typename V>
simdjson_warn_unused simdjson_inline error_code walk_document(V &visitor) noexcept;
/**
* Create an iterator capable of walking a JSON document.
*
* The document must have already passed through stage 1.
*/
simdjson_inline json_iterator(dom_parser_implementation &_dom_parser, size_t start_structural_index);
/**
* Look at the next token.
*
* Tokens can be strings, numbers, booleans, null, or operators (`[{]},:`)).
*
* They may include invalid JSON as well (such as `1.2.3` or `ture`).
*/
simdjson_inline const uint8_t *peek() const noexcept;
/**
* Advance to the next token.
*
* Tokens can be strings, numbers, booleans, null, or operators (`[{]},:`)).
*
* They may include invalid JSON as well (such as `1.2.3` or `ture`).
*/
simdjson_inline const uint8_t *advance() noexcept;
/**
* Get the remaining length of the document, from the start of the current token.
*/
simdjson_inline size_t remaining_len() const noexcept;
/**
* Check if we are at the end of the document.
*
* If this is true, there are no more tokens.
*/
simdjson_inline bool at_eof() const noexcept;
/**
* Check if we are at the beginning of the document.
*/
simdjson_inline bool at_beginning() const noexcept;
simdjson_inline uint8_t last_structural() const noexcept;
/**
* Log that a value has been found.
*
* Set LOG_ENABLED=true in logger.h to see logging.
*/
simdjson_inline void log_value(const char *type) const noexcept;
/**
* Log the start of a multipart value.
*
* Set LOG_ENABLED=true in logger.h to see logging.
*/
simdjson_inline void log_start_value(const char *type) const noexcept;
/**
* Log the end of a multipart value.
*
* Set LOG_ENABLED=true in logger.h to see logging.
*/
simdjson_inline void log_end_value(const char *type) const noexcept;
/**
* Log an error.
*
* Set LOG_ENABLED=true in logger.h to see logging.
*/
simdjson_inline void log_error(const char *error) const noexcept;
template<typename V>
simdjson_warn_unused simdjson_inline error_code visit_root_primitive(V &visitor, const uint8_t *value) noexcept;
template<typename V>
simdjson_warn_unused simdjson_inline error_code visit_primitive(V &visitor, const uint8_t *value) noexcept;
};
template<bool STREAMING, typename V>
simdjson_warn_unused simdjson_inline error_code json_iterator::walk_document(V &visitor) noexcept {
logger::log_start();
//
// Start the document
//
if (at_eof()) { return EMPTY; }
log_start_value("document");
SIMDJSON_TRY( visitor.visit_document_start(*this) );
//
// Read first value
//
{
auto value = advance();
// Make sure the outer object or array is closed before continuing; otherwise, there are ways we
// could get into memory corruption. See https://github.com/simdjson/simdjson/issues/906
if (!STREAMING) {
switch (*value) {
case '{': if (last_structural() != '}') { log_value("starting brace unmatched"); return TAPE_ERROR; }; break;
case '[': if (last_structural() != ']') { log_value("starting bracket unmatched"); return TAPE_ERROR; }; break;
}
}
switch (*value) {
case '{': if (*peek() == '}') { advance(); log_value("empty object"); SIMDJSON_TRY( visitor.visit_empty_object(*this) ); break; } goto object_begin;
case '[': if (*peek() == ']') { advance(); log_value("empty array"); SIMDJSON_TRY( visitor.visit_empty_array(*this) ); break; } goto array_begin;
default: SIMDJSON_TRY( visitor.visit_root_primitive(*this, value) ); break;
}
}
goto document_end;
//
// Object parser states
//
object_begin:
log_start_value("object");
depth++;
if (depth >= dom_parser.max_depth()) { log_error("Exceeded max depth!"); return DEPTH_ERROR; }
dom_parser.is_array[depth] = false;
SIMDJSON_TRY( visitor.visit_object_start(*this) );
{
auto key = advance();
if (*key != '"') { log_error("Object does not start with a key"); return TAPE_ERROR; }
SIMDJSON_TRY( visitor.increment_count(*this) );
SIMDJSON_TRY( visitor.visit_key(*this, key) );
}
object_field:
if (simdjson_unlikely( *advance() != ':' )) { log_error("Missing colon after key in object"); return TAPE_ERROR; }
{
auto value = advance();
switch (*value) {
case '{': if (*peek() == '}') { advance(); log_value("empty object"); SIMDJSON_TRY( visitor.visit_empty_object(*this) ); break; } goto object_begin;
case '[': if (*peek() == ']') { advance(); log_value("empty array"); SIMDJSON_TRY( visitor.visit_empty_array(*this) ); break; } goto array_begin;
default: SIMDJSON_TRY( visitor.visit_primitive(*this, value) ); break;
}
}
object_continue:
switch (*advance()) {
case ',':
SIMDJSON_TRY( visitor.increment_count(*this) );
{
auto key = advance();
if (simdjson_unlikely( *key != '"' )) { log_error("Key string missing at beginning of field in object"); return TAPE_ERROR; }
SIMDJSON_TRY( visitor.visit_key(*this, key) );
}
goto object_field;
case '}': log_end_value("object"); SIMDJSON_TRY( visitor.visit_object_end(*this) ); goto scope_end;
default: log_error("No comma between object fields"); return TAPE_ERROR;
}
scope_end:
depth--;
if (depth == 0) { goto document_end; }
if (dom_parser.is_array[depth]) { goto array_continue; }
goto object_continue;
//
// Array parser states
//
array_begin:
log_start_value("array");
depth++;
if (depth >= dom_parser.max_depth()) { log_error("Exceeded max depth!"); return DEPTH_ERROR; }
dom_parser.is_array[depth] = true;
SIMDJSON_TRY( visitor.visit_array_start(*this) );
SIMDJSON_TRY( visitor.increment_count(*this) );
array_value:
{
auto value = advance();
switch (*value) {
case '{': if (*peek() == '}') { advance(); log_value("empty object"); SIMDJSON_TRY( visitor.visit_empty_object(*this) ); break; } goto object_begin;
case '[': if (*peek() == ']') { advance(); log_value("empty array"); SIMDJSON_TRY( visitor.visit_empty_array(*this) ); break; } goto array_begin;
default: SIMDJSON_TRY( visitor.visit_primitive(*this, value) ); break;
}
}
array_continue:
switch (*advance()) {
case ',': SIMDJSON_TRY( visitor.increment_count(*this) ); goto array_value;
case ']': log_end_value("array"); SIMDJSON_TRY( visitor.visit_array_end(*this) ); goto scope_end;
default: log_error("Missing comma between array values"); return TAPE_ERROR;
}
document_end:
log_end_value("document");
SIMDJSON_TRY( visitor.visit_document_end(*this) );
dom_parser.next_structural_index = uint32_t(next_structural - &dom_parser.structural_indexes[0]);
// If we didn't make it to the end, it's an error
if ( !STREAMING && dom_parser.next_structural_index != dom_parser.n_structural_indexes ) {
log_error("More than one JSON value at the root of the document, or extra characters at the end of the JSON!");
return TAPE_ERROR;
}
return SUCCESS;
} // walk_document()
simdjson_inline json_iterator::json_iterator(dom_parser_implementation &_dom_parser, size_t start_structural_index)
: buf{_dom_parser.buf},
next_structural{&_dom_parser.structural_indexes[start_structural_index]},
dom_parser{_dom_parser} {
}
simdjson_inline const uint8_t *json_iterator::peek() const noexcept {
return &buf[*(next_structural)];
}
simdjson_inline const uint8_t *json_iterator::advance() noexcept {
return &buf[*(next_structural++)];
}
simdjson_inline size_t json_iterator::remaining_len() const noexcept {
return dom_parser.len - *(next_structural-1);
}
simdjson_inline bool json_iterator::at_eof() const noexcept {
return next_structural == &dom_parser.structural_indexes[dom_parser.n_structural_indexes];
}
simdjson_inline bool json_iterator::at_beginning() const noexcept {
return next_structural == dom_parser.structural_indexes.get();
}
simdjson_inline uint8_t json_iterator::last_structural() const noexcept {
return buf[dom_parser.structural_indexes[dom_parser.n_structural_indexes - 1]];
}
simdjson_inline void json_iterator::log_value(const char *type) const noexcept {
logger::log_line(*this, "", type, "");
}
simdjson_inline void json_iterator::log_start_value(const char *type) const noexcept {
logger::log_line(*this, "+", type, "");
if (logger::LOG_ENABLED) { logger::log_depth++; }
}
simdjson_inline void json_iterator::log_end_value(const char *type) const noexcept {
if (logger::LOG_ENABLED) { logger::log_depth--; }
logger::log_line(*this, "-", type, "");
}
simdjson_inline void json_iterator::log_error(const char *error) const noexcept {
logger::log_line(*this, "", "ERROR", error);
}
template<typename V>
simdjson_warn_unused simdjson_inline error_code json_iterator::visit_root_primitive(V &visitor, const uint8_t *value) noexcept {
switch (*value) {
case '"': return visitor.visit_root_string(*this, value);
case 't': return visitor.visit_root_true_atom(*this, value);
case 'f': return visitor.visit_root_false_atom(*this, value);
case 'n': return visitor.visit_root_null_atom(*this, value);
case '-':
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
return visitor.visit_root_number(*this, value);
default:
log_error("Document starts with a non-value character");
return TAPE_ERROR;
}
}
template<typename V>
simdjson_warn_unused simdjson_inline error_code json_iterator::visit_primitive(V &visitor, const uint8_t *value) noexcept {
// Use the fact that most scalars are going to be either strings or numbers.
if(*value == '"') {
return visitor.visit_string(*this, value);
} else if (((*value - '0') < 10) || (*value == '-')) {
return visitor.visit_number(*this, value);
}
// true, false, null are uncommon.
switch (*value) {
case 't': return visitor.visit_true_atom(*this, value);
case 'f': return visitor.visit_false_atom(*this, value);
case 'n': return visitor.visit_null_atom(*this, value);
default:
log_error("Non-value found when value was expected!");
return TAPE_ERROR;
}
}
} // namespace stage2
} // unnamed namespace
} // namespace arm64
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE2_JSON_ITERATOR_H
/* end file generic/stage2/json_iterator.h for arm64 */
/* including generic/stage2/stringparsing.h for arm64: #include <generic/stage2/stringparsing.h> */
/* begin file generic/stage2/stringparsing.h for arm64 */
#ifndef SIMDJSON_SRC_GENERIC_STAGE2_STRINGPARSING_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE2_STRINGPARSING_H */
/* amalgamation skipped (editor-only): #include <generic/stage2/base.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/jsoncharutils.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
// This file contains the common code every implementation uses
// It is intended to be included multiple times and compiled multiple times
namespace simdjson {
namespace arm64 {
namespace {
/// @private
namespace stringparsing {
// begin copypasta
// These chars yield themselves: " \ /
// b -> backspace, f -> formfeed, n -> newline, r -> cr, t -> horizontal tab
// u not handled in this table as it's complex
static const uint8_t escape_map[256] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x0.
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0x22, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x2f,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x4.
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x5c, 0, 0, 0, // 0x5.
0, 0, 0x08, 0, 0, 0, 0x0c, 0, 0, 0, 0, 0, 0, 0, 0x0a, 0, // 0x6.
0, 0, 0x0d, 0, 0x09, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x7.
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
};
// handle a unicode codepoint
// write appropriate values into dest
// src will advance 6 bytes or 12 bytes
// dest will advance a variable amount (return via pointer)
// return true if the unicode codepoint was valid
// We work in little-endian then swap at write time
simdjson_warn_unused
simdjson_inline bool handle_unicode_codepoint(const uint8_t **src_ptr,
uint8_t **dst_ptr, bool allow_replacement) {
// Use the default Unicode Character 'REPLACEMENT CHARACTER' (U+FFFD)
constexpr uint32_t substitution_code_point = 0xfffd;
// jsoncharutils::hex_to_u32_nocheck fills high 16 bits of the return value with 1s if the
// conversion is not valid; we defer the check for this to inside the
// multilingual plane check.
uint32_t code_point = jsoncharutils::hex_to_u32_nocheck(*src_ptr + 2);
*src_ptr += 6;
// If we found a high surrogate, we must
// check for low surrogate for characters
// outside the Basic
// Multilingual Plane.
if (code_point >= 0xd800 && code_point < 0xdc00) {
const uint8_t *src_data = *src_ptr;
/* Compiler optimizations convert this to a single 16-bit load and compare on most platforms */
if (((src_data[0] << 8) | src_data[1]) != ((static_cast<uint8_t> ('\\') << 8) | static_cast<uint8_t> ('u'))) {
if(!allow_replacement) { return false; }
code_point = substitution_code_point;
} else {
uint32_t code_point_2 = jsoncharutils::hex_to_u32_nocheck(src_data + 2);
// We have already checked that the high surrogate is valid and
// (code_point - 0xd800) < 1024.
//
// Check that code_point_2 is in the range 0xdc00..0xdfff
// and that code_point_2 was parsed from valid hex.
uint32_t low_bit = code_point_2 - 0xdc00;
if (low_bit >> 10) {
if(!allow_replacement) { return false; }
code_point = substitution_code_point;
} else {
code_point = (((code_point - 0xd800) << 10) | low_bit) + 0x10000;
*src_ptr += 6;
}
}
} else if (code_point >= 0xdc00 && code_point <= 0xdfff) {
// If we encounter a low surrogate (not preceded by a high surrogate)
// then we have an error.
if(!allow_replacement) { return false; }
code_point = substitution_code_point;
}
size_t offset = jsoncharutils::codepoint_to_utf8(code_point, *dst_ptr);
*dst_ptr += offset;
return offset > 0;
}
// handle a unicode codepoint using the wobbly convention
// https://simonsapin.github.io/wtf-8/
// write appropriate values into dest
// src will advance 6 bytes or 12 bytes
// dest will advance a variable amount (return via pointer)
// return true if the unicode codepoint was valid
// We work in little-endian then swap at write time
simdjson_warn_unused
simdjson_inline bool handle_unicode_codepoint_wobbly(const uint8_t **src_ptr,
uint8_t **dst_ptr) {
// It is not ideal that this function is nearly identical to handle_unicode_codepoint.
//
// jsoncharutils::hex_to_u32_nocheck fills high 16 bits of the return value with 1s if the
// conversion is not valid; we defer the check for this to inside the
// multilingual plane check.
uint32_t code_point = jsoncharutils::hex_to_u32_nocheck(*src_ptr + 2);
*src_ptr += 6;
// If we found a high surrogate, we must
// check for low surrogate for characters
// outside the Basic
// Multilingual Plane.
if (code_point >= 0xd800 && code_point < 0xdc00) {
const uint8_t *src_data = *src_ptr;
/* Compiler optimizations convert this to a single 16-bit load and compare on most platforms */
if (((src_data[0] << 8) | src_data[1]) == ((static_cast<uint8_t> ('\\') << 8) | static_cast<uint8_t> ('u'))) {
uint32_t code_point_2 = jsoncharutils::hex_to_u32_nocheck(src_data + 2);
uint32_t low_bit = code_point_2 - 0xdc00;
if ((low_bit >> 10) == 0) {
code_point =
(((code_point - 0xd800) << 10) | low_bit) + 0x10000;
*src_ptr += 6;
}
}
}
size_t offset = jsoncharutils::codepoint_to_utf8(code_point, *dst_ptr);
*dst_ptr += offset;
return offset > 0;
}
/**
* Unescape a valid UTF-8 string from src to dst, stopping at a final unescaped quote. There
* must be an unescaped quote terminating the string. It returns the final output
* position as pointer. In case of error (e.g., the string has bad escaped codes),
* then null_nullptrptr is returned. It is assumed that the output buffer is large
* enough. E.g., if src points at 'joe"', then dst needs to have four free bytes +
* SIMDJSON_PADDING bytes.
*/
simdjson_warn_unused simdjson_inline uint8_t *parse_string(const uint8_t *src, uint8_t *dst, bool allow_replacement) {
while (1) {
// Copy the next n bytes, and find the backslash and quote in them.
auto bs_quote = backslash_and_quote::copy_and_find(src, dst);
// If the next thing is the end quote, copy and return
if (bs_quote.has_quote_first()) {
// we encountered quotes first. Move dst to point to quotes and exit
return dst + bs_quote.quote_index();
}
if (bs_quote.has_backslash()) {
/* find out where the backspace is */
auto bs_dist = bs_quote.backslash_index();
uint8_t escape_char = src[bs_dist + 1];
/* we encountered backslash first. Handle backslash */
if (escape_char == 'u') {
/* move src/dst up to the start; they will be further adjusted
within the unicode codepoint handling code. */
src += bs_dist;
dst += bs_dist;
if (!handle_unicode_codepoint(&src, &dst, allow_replacement)) {
return nullptr;
}
} else {
/* simple 1:1 conversion. Will eat bs_dist+2 characters in input and
* write bs_dist+1 characters to output
* note this may reach beyond the part of the buffer we've actually
* seen. I think this is ok */
uint8_t escape_result = escape_map[escape_char];
if (escape_result == 0u) {
return nullptr; /* bogus escape value is an error */
}
dst[bs_dist] = escape_result;
src += bs_dist + 2;
dst += bs_dist + 1;
}
} else {
/* they are the same. Since they can't co-occur, it means we
* encountered neither. */
src += backslash_and_quote::BYTES_PROCESSED;
dst += backslash_and_quote::BYTES_PROCESSED;
}
}
}
simdjson_warn_unused simdjson_inline uint8_t *parse_wobbly_string(const uint8_t *src, uint8_t *dst) {
// It is not ideal that this function is nearly identical to parse_string.
while (1) {
// Copy the next n bytes, and find the backslash and quote in them.
auto bs_quote = backslash_and_quote::copy_and_find(src, dst);
// If the next thing is the end quote, copy and return
if (bs_quote.has_quote_first()) {
// we encountered quotes first. Move dst to point to quotes and exit
return dst + bs_quote.quote_index();
}
if (bs_quote.has_backslash()) {
/* find out where the backspace is */
auto bs_dist = bs_quote.backslash_index();
uint8_t escape_char = src[bs_dist + 1];
/* we encountered backslash first. Handle backslash */
if (escape_char == 'u') {
/* move src/dst up to the start; they will be further adjusted
within the unicode codepoint handling code. */
src += bs_dist;
dst += bs_dist;
if (!handle_unicode_codepoint_wobbly(&src, &dst)) {
return nullptr;
}
} else {
/* simple 1:1 conversion. Will eat bs_dist+2 characters in input and
* write bs_dist+1 characters to output
* note this may reach beyond the part of the buffer we've actually
* seen. I think this is ok */
uint8_t escape_result = escape_map[escape_char];
if (escape_result == 0u) {
return nullptr; /* bogus escape value is an error */
}
dst[bs_dist] = escape_result;
src += bs_dist + 2;
dst += bs_dist + 1;
}
} else {
/* they are the same. Since they can't co-occur, it means we
* encountered neither. */
src += backslash_and_quote::BYTES_PROCESSED;
dst += backslash_and_quote::BYTES_PROCESSED;
}
}
}
} // namespace stringparsing
} // unnamed namespace
} // namespace arm64
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE2_STRINGPARSING_H
/* end file generic/stage2/stringparsing.h for arm64 */
/* including generic/stage2/structural_iterator.h for arm64: #include <generic/stage2/structural_iterator.h> */
/* begin file generic/stage2/structural_iterator.h for arm64 */
#ifndef SIMDJSON_SRC_GENERIC_STAGE2_STRUCTURAL_ITERATOR_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE2_STRUCTURAL_ITERATOR_H */
/* amalgamation skipped (editor-only): #include <generic/stage2/base.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/dom_parser_implementation.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace arm64 {
namespace {
namespace stage2 {
class structural_iterator {
public:
const uint8_t* const buf;
uint32_t *next_structural;
dom_parser_implementation &dom_parser;
// Start a structural
simdjson_inline structural_iterator(dom_parser_implementation &_dom_parser, size_t start_structural_index)
: buf{_dom_parser.buf},
next_structural{&_dom_parser.structural_indexes[start_structural_index]},
dom_parser{_dom_parser} {
}
// Get the buffer position of the current structural character
simdjson_inline const uint8_t* current() {
return &buf[*(next_structural-1)];
}
// Get the current structural character
simdjson_inline char current_char() {
return buf[*(next_structural-1)];
}
// Get the next structural character without advancing
simdjson_inline char peek_next_char() {
return buf[*next_structural];
}
simdjson_inline const uint8_t* peek() {
return &buf[*next_structural];
}
simdjson_inline const uint8_t* advance() {
return &buf[*(next_structural++)];
}
simdjson_inline char advance_char() {
return buf[*(next_structural++)];
}
simdjson_inline size_t remaining_len() {
return dom_parser.len - *(next_structural-1);
}
simdjson_inline bool at_end() {
return next_structural == &dom_parser.structural_indexes[dom_parser.n_structural_indexes];
}
simdjson_inline bool at_beginning() {
return next_structural == dom_parser.structural_indexes.get();
}
};
} // namespace stage2
} // unnamed namespace
} // namespace arm64
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE2_STRUCTURAL_ITERATOR_H
/* end file generic/stage2/structural_iterator.h for arm64 */
/* including generic/stage2/tape_builder.h for arm64: #include <generic/stage2/tape_builder.h> */
/* begin file generic/stage2/tape_builder.h for arm64 */
#ifndef SIMDJSON_SRC_GENERIC_STAGE2_TAPE_BUILDER_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE2_TAPE_BUILDER_H */
/* amalgamation skipped (editor-only): #include <generic/stage2/base.h> */
/* amalgamation skipped (editor-only): #include <generic/stage2/json_iterator.h> */
/* amalgamation skipped (editor-only): #include <generic/stage2/stringparsing.h> */
/* amalgamation skipped (editor-only): #include <generic/stage2/tape_writer.h> */
/* amalgamation skipped (editor-only): #include <simdjson/dom/document.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/atomparsing.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/dom_parser_implementation.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/numberparsing.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace arm64 {
namespace {
namespace stage2 {
struct tape_builder {
template<bool STREAMING>
simdjson_warn_unused static simdjson_inline error_code parse_document(
dom_parser_implementation &dom_parser,
dom::document &doc) noexcept;
/** Called when a non-empty document starts. */
simdjson_warn_unused simdjson_inline error_code visit_document_start(json_iterator &iter) noexcept;
/** Called when a non-empty document ends without error. */
simdjson_warn_unused simdjson_inline error_code visit_document_end(json_iterator &iter) noexcept;
/** Called when a non-empty array starts. */
simdjson_warn_unused simdjson_inline error_code visit_array_start(json_iterator &iter) noexcept;
/** Called when a non-empty array ends. */
simdjson_warn_unused simdjson_inline error_code visit_array_end(json_iterator &iter) noexcept;
/** Called when an empty array is found. */
simdjson_warn_unused simdjson_inline error_code visit_empty_array(json_iterator &iter) noexcept;
/** Called when a non-empty object starts. */
simdjson_warn_unused simdjson_inline error_code visit_object_start(json_iterator &iter) noexcept;
/**
* Called when a key in a field is encountered.
*
* primitive, visit_object_start, visit_empty_object, visit_array_start, or visit_empty_array
* will be called after this with the field value.
*/
simdjson_warn_unused simdjson_inline error_code visit_key(json_iterator &iter, const uint8_t *key) noexcept;
/** Called when a non-empty object ends. */
simdjson_warn_unused simdjson_inline error_code visit_object_end(json_iterator &iter) noexcept;
/** Called when an empty object is found. */
simdjson_warn_unused simdjson_inline error_code visit_empty_object(json_iterator &iter) noexcept;
/**
* Called when a string, number, boolean or null is found.
*/
simdjson_warn_unused simdjson_inline error_code visit_primitive(json_iterator &iter, const uint8_t *value) noexcept;
/**
* Called when a string, number, boolean or null is found at the top level of a document (i.e.
* when there is no array or object and the entire document is a single string, number, boolean or
* null.
*
* This is separate from primitive() because simdjson's normal primitive parsing routines assume
* there is at least one more token after the value, which is only true in an array or object.
*/
simdjson_warn_unused simdjson_inline error_code visit_root_primitive(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_string(json_iterator &iter, const uint8_t *value, bool key = false) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_number(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_true_atom(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_false_atom(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_null_atom(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_root_string(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_root_number(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_root_true_atom(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_root_false_atom(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_root_null_atom(json_iterator &iter, const uint8_t *value) noexcept;
/** Called each time a new field or element in an array or object is found. */
simdjson_warn_unused simdjson_inline error_code increment_count(json_iterator &iter) noexcept;
/** Next location to write to tape */
tape_writer tape;
private:
/** Next write location in the string buf for stage 2 parsing */
uint8_t *current_string_buf_loc;
simdjson_inline tape_builder(dom::document &doc) noexcept;
simdjson_inline uint32_t next_tape_index(json_iterator &iter) const noexcept;
simdjson_inline void start_container(json_iterator &iter) noexcept;
simdjson_warn_unused simdjson_inline error_code end_container(json_iterator &iter, internal::tape_type start, internal::tape_type end) noexcept;
simdjson_warn_unused simdjson_inline error_code empty_container(json_iterator &iter, internal::tape_type start, internal::tape_type end) noexcept;
simdjson_inline uint8_t *on_start_string(json_iterator &iter) noexcept;
simdjson_inline void on_end_string(uint8_t *dst) noexcept;
}; // struct tape_builder
template<bool STREAMING>
simdjson_warn_unused simdjson_inline error_code tape_builder::parse_document(
dom_parser_implementation &dom_parser,
dom::document &doc) noexcept {
dom_parser.doc = &doc;
json_iterator iter(dom_parser, STREAMING ? dom_parser.next_structural_index : 0);
tape_builder builder(doc);
return iter.walk_document<STREAMING>(builder);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_root_primitive(json_iterator &iter, const uint8_t *value) noexcept {
return iter.visit_root_primitive(*this, value);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_primitive(json_iterator &iter, const uint8_t *value) noexcept {
return iter.visit_primitive(*this, value);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_empty_object(json_iterator &iter) noexcept {
return empty_container(iter, internal::tape_type::START_OBJECT, internal::tape_type::END_OBJECT);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_empty_array(json_iterator &iter) noexcept {
return empty_container(iter, internal::tape_type::START_ARRAY, internal::tape_type::END_ARRAY);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_document_start(json_iterator &iter) noexcept {
start_container(iter);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_object_start(json_iterator &iter) noexcept {
start_container(iter);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_array_start(json_iterator &iter) noexcept {
start_container(iter);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_object_end(json_iterator &iter) noexcept {
return end_container(iter, internal::tape_type::START_OBJECT, internal::tape_type::END_OBJECT);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_array_end(json_iterator &iter) noexcept {
return end_container(iter, internal::tape_type::START_ARRAY, internal::tape_type::END_ARRAY);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_document_end(json_iterator &iter) noexcept {
constexpr uint32_t start_tape_index = 0;
tape.append(start_tape_index, internal::tape_type::ROOT);
tape_writer::write(iter.dom_parser.doc->tape[start_tape_index], next_tape_index(iter), internal::tape_type::ROOT);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_key(json_iterator &iter, const uint8_t *key) noexcept {
return visit_string(iter, key, true);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::increment_count(json_iterator &iter) noexcept {
iter.dom_parser.open_containers[iter.depth].count++; // we have a key value pair in the object at parser.dom_parser.depth - 1
return SUCCESS;
}
simdjson_inline tape_builder::tape_builder(dom::document &doc) noexcept : tape{doc.tape.get()}, current_string_buf_loc{doc.string_buf.get()} {}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_string(json_iterator &iter, const uint8_t *value, bool key) noexcept {
iter.log_value(key ? "key" : "string");
uint8_t *dst = on_start_string(iter);
dst = stringparsing::parse_string(value+1, dst, false); // We do not allow replacement when the escape characters are invalid.
if (dst == nullptr) {
iter.log_error("Invalid escape in string");
return STRING_ERROR;
}
on_end_string(dst);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_root_string(json_iterator &iter, const uint8_t *value) noexcept {
return visit_string(iter, value);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_number(json_iterator &iter, const uint8_t *value) noexcept {
iter.log_value("number");
return numberparsing::parse_number(value, tape);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_root_number(json_iterator &iter, const uint8_t *value) noexcept {
//
// We need to make a copy to make sure that the string is space terminated.
// This is not about padding the input, which should already padded up
// to len + SIMDJSON_PADDING. However, we have no control at this stage
// on how the padding was done. What if the input string was padded with nulls?
// It is quite common for an input string to have an extra null character (C string).
// We do not want to allow 9\0 (where \0 is the null character) inside a JSON
// document, but the string "9\0" by itself is fine. So we make a copy and
// pad the input with spaces when we know that there is just one input element.
// This copy is relatively expensive, but it will almost never be called in
// practice unless you are in the strange scenario where you have many JSON
// documents made of single atoms.
//
std::unique_ptr<uint8_t[]>copy(new (std::nothrow) uint8_t[iter.remaining_len() + SIMDJSON_PADDING]);
if (copy.get() == nullptr) { return MEMALLOC; }
std::memcpy(copy.get(), value, iter.remaining_len());
std::memset(copy.get() + iter.remaining_len(), ' ', SIMDJSON_PADDING);
error_code error = visit_number(iter, copy.get());
return error;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_true_atom(json_iterator &iter, const uint8_t *value) noexcept {
iter.log_value("true");
if (!atomparsing::is_valid_true_atom(value)) { return T_ATOM_ERROR; }
tape.append(0, internal::tape_type::TRUE_VALUE);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_root_true_atom(json_iterator &iter, const uint8_t *value) noexcept {
iter.log_value("true");
if (!atomparsing::is_valid_true_atom(value, iter.remaining_len())) { return T_ATOM_ERROR; }
tape.append(0, internal::tape_type::TRUE_VALUE);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_false_atom(json_iterator &iter, const uint8_t *value) noexcept {
iter.log_value("false");
if (!atomparsing::is_valid_false_atom(value)) { return F_ATOM_ERROR; }
tape.append(0, internal::tape_type::FALSE_VALUE);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_root_false_atom(json_iterator &iter, const uint8_t *value) noexcept {
iter.log_value("false");
if (!atomparsing::is_valid_false_atom(value, iter.remaining_len())) { return F_ATOM_ERROR; }
tape.append(0, internal::tape_type::FALSE_VALUE);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_null_atom(json_iterator &iter, const uint8_t *value) noexcept {
iter.log_value("null");
if (!atomparsing::is_valid_null_atom(value)) { return N_ATOM_ERROR; }
tape.append(0, internal::tape_type::NULL_VALUE);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_root_null_atom(json_iterator &iter, const uint8_t *value) noexcept {
iter.log_value("null");
if (!atomparsing::is_valid_null_atom(value, iter.remaining_len())) { return N_ATOM_ERROR; }
tape.append(0, internal::tape_type::NULL_VALUE);
return SUCCESS;
}
// private:
simdjson_inline uint32_t tape_builder::next_tape_index(json_iterator &iter) const noexcept {
return uint32_t(tape.next_tape_loc - iter.dom_parser.doc->tape.get());
}
simdjson_warn_unused simdjson_inline error_code tape_builder::empty_container(json_iterator &iter, internal::tape_type start, internal::tape_type end) noexcept {
auto start_index = next_tape_index(iter);
tape.append(start_index+2, start);
tape.append(start_index, end);
return SUCCESS;
}
simdjson_inline void tape_builder::start_container(json_iterator &iter) noexcept {
iter.dom_parser.open_containers[iter.depth].tape_index = next_tape_index(iter);
iter.dom_parser.open_containers[iter.depth].count = 0;
tape.skip(); // We don't actually *write* the start element until the end.
}
simdjson_warn_unused simdjson_inline error_code tape_builder::end_container(json_iterator &iter, internal::tape_type start, internal::tape_type end) noexcept {
// Write the ending tape element, pointing at the start location
const uint32_t start_tape_index = iter.dom_parser.open_containers[iter.depth].tape_index;
tape.append(start_tape_index, end);
// Write the start tape element, pointing at the end location (and including count)
// count can overflow if it exceeds 24 bits... so we saturate
// the convention being that a cnt of 0xffffff or more is undetermined in value (>= 0xffffff).
const uint32_t count = iter.dom_parser.open_containers[iter.depth].count;
const uint32_t cntsat = count > 0xFFFFFF ? 0xFFFFFF : count;
tape_writer::write(iter.dom_parser.doc->tape[start_tape_index], next_tape_index(iter) | (uint64_t(cntsat) << 32), start);
return SUCCESS;
}
simdjson_inline uint8_t *tape_builder::on_start_string(json_iterator &iter) noexcept {
// we advance the point, accounting for the fact that we have a NULL termination
tape.append(current_string_buf_loc - iter.dom_parser.doc->string_buf.get(), internal::tape_type::STRING);
return current_string_buf_loc + sizeof(uint32_t);
}
simdjson_inline void tape_builder::on_end_string(uint8_t *dst) noexcept {
uint32_t str_length = uint32_t(dst - (current_string_buf_loc + sizeof(uint32_t)));
// TODO check for overflow in case someone has a crazy string (>=4GB?)
// But only add the overflow check when the document itself exceeds 4GB
// Currently unneeded because we refuse to parse docs larger or equal to 4GB.
memcpy(current_string_buf_loc, &str_length, sizeof(uint32_t));
// NULL termination is still handy if you expect all your strings to
// be NULL terminated? It comes at a small cost
*dst = 0;
current_string_buf_loc = dst + 1;
}
} // namespace stage2
} // unnamed namespace
} // namespace arm64
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE2_TAPE_BUILDER_H
/* end file generic/stage2/tape_builder.h for arm64 */
/* end file generic/stage2/amalgamated.h for arm64 */
//
// Stage 1
//
namespace simdjson {
namespace arm64 {
simdjson_warn_unused error_code implementation::create_dom_parser_implementation(
size_t capacity,
size_t max_depth,
std::unique_ptr<internal::dom_parser_implementation>& dst
) const noexcept {
dst.reset( new (std::nothrow) dom_parser_implementation() );
if (!dst) { return MEMALLOC; }
if (auto err = dst->set_capacity(capacity))
return err;
if (auto err = dst->set_max_depth(max_depth))
return err;
return SUCCESS;
}
namespace {
using namespace simd;
simdjson_inline json_character_block json_character_block::classify(const simd::simd8x64<uint8_t>& in) {
// Functional programming causes trouble with Visual Studio.
// Keeping this version in comments since it is much nicer:
// auto v = in.map<uint8_t>([&](simd8<uint8_t> chunk) {
// auto nib_lo = chunk & 0xf;
// auto nib_hi = chunk.shr<4>();
// auto shuf_lo = nib_lo.lookup_16<uint8_t>(16, 0, 0, 0, 0, 0, 0, 0, 0, 8, 12, 1, 2, 9, 0, 0);
// auto shuf_hi = nib_hi.lookup_16<uint8_t>(8, 0, 18, 4, 0, 1, 0, 1, 0, 0, 0, 3, 2, 1, 0, 0);
// return shuf_lo & shuf_hi;
// });
const simd8<uint8_t> table1(16, 0, 0, 0, 0, 0, 0, 0, 0, 8, 12, 1, 2, 9, 0, 0);
const simd8<uint8_t> table2(8, 0, 18, 4, 0, 1, 0, 1, 0, 0, 0, 3, 2, 1, 0, 0);
simd8x64<uint8_t> v(
(in.chunks[0] & 0xf).lookup_16(table1) & (in.chunks[0].shr<4>()).lookup_16(table2),
(in.chunks[1] & 0xf).lookup_16(table1) & (in.chunks[1].shr<4>()).lookup_16(table2),
(in.chunks[2] & 0xf).lookup_16(table1) & (in.chunks[2].shr<4>()).lookup_16(table2),
(in.chunks[3] & 0xf).lookup_16(table1) & (in.chunks[3].shr<4>()).lookup_16(table2)
);
// We compute whitespace and op separately. If the code later only use one or the
// other, given the fact that all functions are aggressively inlined, we can
// hope that useless computations will be omitted. This is namely case when
// minifying (we only need whitespace). *However* if we only need spaces,
// it is likely that we will still compute 'v' above with two lookup_16: one
// could do it a bit cheaper. This is in contrast with the x64 implementations
// where we can, efficiently, do the white space and structural matching
// separately. One reason for this difference is that on ARM NEON, the table
// lookups either zero or leave unchanged the characters exceeding 0xF whereas
// on x64, the equivalent instruction (pshufb) automatically applies a mask,
// ignoring the 4 most significant bits. Thus the x64 implementation is
// optimized differently. This being said, if you use this code strictly
// just for minification (or just to identify the structural characters),
// there is a small untaken optimization opportunity here. We deliberately
// do not pick it up.
uint64_t op = simd8x64<bool>(
v.chunks[0].any_bits_set(0x7),
v.chunks[1].any_bits_set(0x7),
v.chunks[2].any_bits_set(0x7),
v.chunks[3].any_bits_set(0x7)
).to_bitmask();
uint64_t whitespace = simd8x64<bool>(
v.chunks[0].any_bits_set(0x18),
v.chunks[1].any_bits_set(0x18),
v.chunks[2].any_bits_set(0x18),
v.chunks[3].any_bits_set(0x18)
).to_bitmask();
return { whitespace, op };
}
simdjson_inline bool is_ascii(const simd8x64<uint8_t>& input) {
simd8<uint8_t> bits = input.reduce_or();
return bits.max_val() < 0x80u;
}
simdjson_unused simdjson_inline simd8<bool> must_be_continuation(const simd8<uint8_t> prev1, const simd8<uint8_t> prev2, const simd8<uint8_t> prev3) {
simd8<bool> is_second_byte = prev1 >= uint8_t(0xc0u);
simd8<bool> is_third_byte = prev2 >= uint8_t(0xe0u);
simd8<bool> is_fourth_byte = prev3 >= uint8_t(0xf0u);
// Use ^ instead of | for is_*_byte, because ^ is commutative, and the caller is using ^ as well.
// This will work fine because we only have to report errors for cases with 0-1 lead bytes.
// Multiple lead bytes implies 2 overlapping multibyte characters, and if that happens, there is
// guaranteed to be at least *one* lead byte that is part of only 1 other multibyte character.
// The error will be detected there.
return is_second_byte ^ is_third_byte ^ is_fourth_byte;
}
simdjson_inline simd8<uint8_t> must_be_2_3_continuation(const simd8<uint8_t> prev2, const simd8<uint8_t> prev3) {
simd8<uint8_t> is_third_byte = prev2.saturating_sub(0xe0u-0x80); // Only 111_____ will be >= 0x80
simd8<uint8_t> is_fourth_byte = prev3.saturating_sub(0xf0u-0x80); // Only 1111____ will be >= 0x80
return is_third_byte | is_fourth_byte;
}
} // unnamed namespace
} // namespace arm64
} // namespace simdjson
//
// Stage 2
//
//
// Implementation-specific overrides
//
namespace simdjson {
namespace arm64 {
simdjson_warn_unused error_code implementation::minify(const uint8_t *buf, size_t len, uint8_t *dst, size_t &dst_len) const noexcept {
return arm64::stage1::json_minifier::minify<64>(buf, len, dst, dst_len);
}
simdjson_warn_unused error_code dom_parser_implementation::stage1(const uint8_t *_buf, size_t _len, stage1_mode streaming) noexcept {
this->buf = _buf;
this->len = _len;
return arm64::stage1::json_structural_indexer::index<64>(buf, len, *this, streaming);
}
simdjson_warn_unused bool implementation::validate_utf8(const char *buf, size_t len) const noexcept {
return arm64::stage1::generic_validate_utf8(buf,len);
}
simdjson_warn_unused error_code dom_parser_implementation::stage2(dom::document &_doc) noexcept {
return stage2::tape_builder::parse_document<false>(*this, _doc);
}
simdjson_warn_unused error_code dom_parser_implementation::stage2_next(dom::document &_doc) noexcept {
return stage2::tape_builder::parse_document<true>(*this, _doc);
}
simdjson_warn_unused uint8_t *dom_parser_implementation::parse_string(const uint8_t *src, uint8_t *dst, bool allow_replacement) const noexcept {
return arm64::stringparsing::parse_string(src, dst, allow_replacement);
}
simdjson_warn_unused uint8_t *dom_parser_implementation::parse_wobbly_string(const uint8_t *src, uint8_t *dst) const noexcept {
return arm64::stringparsing::parse_wobbly_string(src, dst);
}
simdjson_warn_unused error_code dom_parser_implementation::parse(const uint8_t *_buf, size_t _len, dom::document &_doc) noexcept {
auto error = stage1(_buf, _len, stage1_mode::regular);
if (error) { return error; }
return stage2(_doc);
}
} // namespace arm64
} // namespace simdjson
/* including simdjson/arm64/end.h: #include <simdjson/arm64/end.h> */
/* begin file simdjson/arm64/end.h */
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/arm64/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#undef SIMDJSON_SKIP_BACKSLASH_SHORT_CIRCUIT
/* undefining SIMDJSON_IMPLEMENTATION from "arm64" */
#undef SIMDJSON_IMPLEMENTATION
/* end file simdjson/arm64/end.h */
#endif // SIMDJSON_SRC_ARM64_CPP
/* end file arm64.cpp */
#endif
#if SIMDJSON_IMPLEMENTATION_HASWELL
/* including haswell.cpp: #include <haswell.cpp> */
/* begin file haswell.cpp */
#ifndef SIMDJSON_SRC_HASWELL_CPP
#define SIMDJSON_SRC_HASWELL_CPP
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include <base.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
/* including simdjson/haswell.h: #include <simdjson/haswell.h> */
/* begin file simdjson/haswell.h */
#ifndef SIMDJSON_HASWELL_H
#define SIMDJSON_HASWELL_H
/* including simdjson/haswell/begin.h: #include "simdjson/haswell/begin.h" */
/* begin file simdjson/haswell/begin.h */
/* defining SIMDJSON_IMPLEMENTATION to "haswell" */
#define SIMDJSON_IMPLEMENTATION haswell
/* including simdjson/haswell/base.h: #include "simdjson/haswell/base.h" */
/* begin file simdjson/haswell/base.h */
#ifndef SIMDJSON_HASWELL_BASE_H
#define SIMDJSON_HASWELL_BASE_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
// The constructor may be executed on any host, so we take care not to use SIMDJSON_TARGET_HASWELL
namespace simdjson {
/**
* Implementation for Haswell (Intel AVX2).
*/
namespace haswell {
class implementation;
namespace {
namespace simd {
template <typename T> struct simd8;
template <typename T> struct simd8x64;
} // namespace simd
} // unnamed namespace
} // namespace haswell
} // namespace simdjson
#endif // SIMDJSON_HASWELL_BASE_H
/* end file simdjson/haswell/base.h */
/* including simdjson/haswell/intrinsics.h: #include "simdjson/haswell/intrinsics.h" */
/* begin file simdjson/haswell/intrinsics.h */
#ifndef SIMDJSON_HASWELL_INTRINSICS_H
#define SIMDJSON_HASWELL_INTRINSICS_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/haswell/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#if SIMDJSON_VISUAL_STUDIO
// under clang within visual studio, this will include <x86intrin.h>
#include <intrin.h> // visual studio or clang
#else
#include <x86intrin.h> // elsewhere
#endif // SIMDJSON_VISUAL_STUDIO
#if SIMDJSON_CLANG_VISUAL_STUDIO
/**
* You are not supposed, normally, to include these
* headers directly. Instead you should either include intrin.h
* or x86intrin.h. However, when compiling with clang
* under Windows (i.e., when _MSC_VER is set), these headers
* only get included *if* the corresponding features are detected
* from macros:
* e.g., if __AVX2__ is set... in turn, we normally set these
* macros by compiling against the corresponding architecture
* (e.g., arch:AVX2, -mavx2, etc.) which compiles the whole
* software with these advanced instructions. In simdjson, we
* want to compile the whole program for a generic target,
* and only target our specific kernels. As a workaround,
* we directly include the needed headers. These headers would
* normally guard against such usage, but we carefully included
* <x86intrin.h> (or <intrin.h>) before, so the headers
* are fooled.
*/
#include <bmiintrin.h> // for _blsr_u64
#include <lzcntintrin.h> // for __lzcnt64
#include <immintrin.h> // for most things (AVX2, AVX512, _popcnt64)
#include <smmintrin.h>
#include <tmmintrin.h>
#include <avxintrin.h>
#include <avx2intrin.h>
#include <wmmintrin.h> // for _mm_clmulepi64_si128
// unfortunately, we may not get _blsr_u64, but, thankfully, clang
// has it as a macro.
#ifndef _blsr_u64
// we roll our own
#define _blsr_u64(n) ((n - 1) & n)
#endif // _blsr_u64
#endif // SIMDJSON_CLANG_VISUAL_STUDIO
static_assert(sizeof(__m256i) <= simdjson::SIMDJSON_PADDING, "insufficient padding for haswell kernel.");
#endif // SIMDJSON_HASWELL_INTRINSICS_H
/* end file simdjson/haswell/intrinsics.h */
#if !SIMDJSON_CAN_ALWAYS_RUN_HASWELL
SIMDJSON_TARGET_REGION("avx2,bmi,pclmul,lzcnt,popcnt")
#endif
/* including simdjson/haswell/bitmanipulation.h: #include "simdjson/haswell/bitmanipulation.h" */
/* begin file simdjson/haswell/bitmanipulation.h */
#ifndef SIMDJSON_HASWELL_BITMANIPULATION_H
#define SIMDJSON_HASWELL_BITMANIPULATION_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/haswell/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/haswell/intrinsics.h" */
/* amalgamation skipped (editor-only): #include "simdjson/haswell/bitmask.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace haswell {
namespace {
// We sometimes call trailing_zero on inputs that are zero,
// but the algorithms do not end up using the returned value.
// Sadly, sanitizers are not smart enough to figure it out.
SIMDJSON_NO_SANITIZE_UNDEFINED
// This function can be used safely even if not all bytes have been
// initialized.
// See issue https://github.com/simdjson/simdjson/issues/1965
SIMDJSON_NO_SANITIZE_MEMORY
simdjson_inline int trailing_zeroes(uint64_t input_num) {
#if SIMDJSON_REGULAR_VISUAL_STUDIO
return (int)_tzcnt_u64(input_num);
#else // SIMDJSON_REGULAR_VISUAL_STUDIO
////////
// You might expect the next line to be equivalent to
// return (int)_tzcnt_u64(input_num);
// but the generated code differs and might be less efficient?
////////
return __builtin_ctzll(input_num);
#endif // SIMDJSON_REGULAR_VISUAL_STUDIO
}
/* result might be undefined when input_num is zero */
simdjson_inline uint64_t clear_lowest_bit(uint64_t input_num) {
return _blsr_u64(input_num);
}
/* result might be undefined when input_num is zero */
simdjson_inline int leading_zeroes(uint64_t input_num) {
return int(_lzcnt_u64(input_num));
}
#if SIMDJSON_REGULAR_VISUAL_STUDIO
simdjson_inline unsigned __int64 count_ones(uint64_t input_num) {
// note: we do not support legacy 32-bit Windows in this kernel
return __popcnt64(input_num);// Visual Studio wants two underscores
}
#else
simdjson_inline long long int count_ones(uint64_t input_num) {
return _popcnt64(input_num);
}
#endif
simdjson_inline bool add_overflow(uint64_t value1, uint64_t value2,
uint64_t *result) {
#if SIMDJSON_REGULAR_VISUAL_STUDIO
return _addcarry_u64(0, value1, value2,
reinterpret_cast<unsigned __int64 *>(result));
#else
return __builtin_uaddll_overflow(value1, value2,
reinterpret_cast<unsigned long long *>(result));
#endif
}
} // unnamed namespace
} // namespace haswell
} // namespace simdjson
#endif // SIMDJSON_HASWELL_BITMANIPULATION_H
/* end file simdjson/haswell/bitmanipulation.h */
/* including simdjson/haswell/bitmask.h: #include "simdjson/haswell/bitmask.h" */
/* begin file simdjson/haswell/bitmask.h */
#ifndef SIMDJSON_HASWELL_BITMASK_H
#define SIMDJSON_HASWELL_BITMASK_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/haswell/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/haswell/intrinsics.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace haswell {
namespace {
//
// Perform a "cumulative bitwise xor," flipping bits each time a 1 is encountered.
//
// For example, prefix_xor(00100100) == 00011100
//
simdjson_inline uint64_t prefix_xor(const uint64_t bitmask) {
// There should be no such thing with a processor supporting avx2
// but not clmul.
__m128i all_ones = _mm_set1_epi8('\xFF');
__m128i result = _mm_clmulepi64_si128(_mm_set_epi64x(0ULL, bitmask), all_ones, 0);
return _mm_cvtsi128_si64(result);
}
} // unnamed namespace
} // namespace haswell
} // namespace simdjson
#endif // SIMDJSON_HASWELL_BITMASK_H
/* end file simdjson/haswell/bitmask.h */
/* including simdjson/haswell/numberparsing_defs.h: #include "simdjson/haswell/numberparsing_defs.h" */
/* begin file simdjson/haswell/numberparsing_defs.h */
#ifndef SIMDJSON_HASWELL_NUMBERPARSING_DEFS_H
#define SIMDJSON_HASWELL_NUMBERPARSING_DEFS_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/haswell/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/haswell/intrinsics.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/internal/numberparsing_tables.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace haswell {
namespace numberparsing {
/** @private */
static simdjson_inline uint32_t parse_eight_digits_unrolled(const uint8_t *chars) {
// this actually computes *16* values so we are being wasteful.
const __m128i ascii0 = _mm_set1_epi8('0');
const __m128i mul_1_10 =
_mm_setr_epi8(10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1);
const __m128i mul_1_100 = _mm_setr_epi16(100, 1, 100, 1, 100, 1, 100, 1);
const __m128i mul_1_10000 =
_mm_setr_epi16(10000, 1, 10000, 1, 10000, 1, 10000, 1);
const __m128i input = _mm_sub_epi8(
_mm_loadu_si128(reinterpret_cast<const __m128i *>(chars)), ascii0);
const __m128i t1 = _mm_maddubs_epi16(input, mul_1_10);
const __m128i t2 = _mm_madd_epi16(t1, mul_1_100);
const __m128i t3 = _mm_packus_epi32(t2, t2);
const __m128i t4 = _mm_madd_epi16(t3, mul_1_10000);
return _mm_cvtsi128_si32(
t4); // only captures the sum of the first 8 digits, drop the rest
}
/** @private */
simdjson_inline internal::value128 full_multiplication(uint64_t value1, uint64_t value2) {
internal::value128 answer;
#if SIMDJSON_REGULAR_VISUAL_STUDIO || SIMDJSON_IS_32BITS
#ifdef _M_ARM64
// ARM64 has native support for 64-bit multiplications, no need to emultate
answer.high = __umulh(value1, value2);
answer.low = value1 * value2;
#else
answer.low = _umul128(value1, value2, &answer.high); // _umul128 not available on ARM64
#endif // _M_ARM64
#else // SIMDJSON_REGULAR_VISUAL_STUDIO || SIMDJSON_IS_32BITS
__uint128_t r = (static_cast<__uint128_t>(value1)) * value2;
answer.low = uint64_t(r);
answer.high = uint64_t(r >> 64);
#endif
return answer;
}
} // namespace numberparsing
} // namespace haswell
} // namespace simdjson
#define SIMDJSON_SWAR_NUMBER_PARSING 1
#endif // SIMDJSON_HASWELL_NUMBERPARSING_DEFS_H
/* end file simdjson/haswell/numberparsing_defs.h */
/* including simdjson/haswell/simd.h: #include "simdjson/haswell/simd.h" */
/* begin file simdjson/haswell/simd.h */
#ifndef SIMDJSON_HASWELL_SIMD_H
#define SIMDJSON_HASWELL_SIMD_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/haswell/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/haswell/intrinsics.h" */
/* amalgamation skipped (editor-only): #include "simdjson/haswell/bitmanipulation.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/simdprune_tables.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace haswell {
namespace {
namespace simd {
// Forward-declared so they can be used by splat and friends.
template<typename Child>
struct base {
__m256i value;
// Zero constructor
simdjson_inline base() : value{__m256i()} {}
// Conversion from SIMD register
simdjson_inline base(const __m256i _value) : value(_value) {}
// Conversion to SIMD register
simdjson_inline operator const __m256i&() const { return this->value; }
simdjson_inline operator __m256i&() { return this->value; }
// Bit operations
simdjson_inline Child operator|(const Child other) const { return _mm256_or_si256(*this, other); }
simdjson_inline Child operator&(const Child other) const { return _mm256_and_si256(*this, other); }
simdjson_inline Child operator^(const Child other) const { return _mm256_xor_si256(*this, other); }
simdjson_inline Child bit_andnot(const Child other) const { return _mm256_andnot_si256(other, *this); }
simdjson_inline Child& operator|=(const Child other) { auto this_cast = static_cast<Child*>(this); *this_cast = *this_cast | other; return *this_cast; }
simdjson_inline Child& operator&=(const Child other) { auto this_cast = static_cast<Child*>(this); *this_cast = *this_cast & other; return *this_cast; }
simdjson_inline Child& operator^=(const Child other) { auto this_cast = static_cast<Child*>(this); *this_cast = *this_cast ^ other; return *this_cast; }
};
// Forward-declared so they can be used by splat and friends.
template<typename T>
struct simd8;
template<typename T, typename Mask=simd8<bool>>
struct base8: base<simd8<T>> {
typedef uint32_t bitmask_t;
typedef uint64_t bitmask2_t;
simdjson_inline base8() : base<simd8<T>>() {}
simdjson_inline base8(const __m256i _value) : base<simd8<T>>(_value) {}
friend simdjson_really_inline Mask operator==(const simd8<T> lhs, const simd8<T> rhs) { return _mm256_cmpeq_epi8(lhs, rhs); }
static const int SIZE = sizeof(base<T>::value);
template<int N=1>
simdjson_inline simd8<T> prev(const simd8<T> prev_chunk) const {
return _mm256_alignr_epi8(*this, _mm256_permute2x128_si256(prev_chunk, *this, 0x21), 16 - N);
}
};
// SIMD byte mask type (returned by things like eq and gt)
template<>
struct simd8<bool>: base8<bool> {
static simdjson_inline simd8<bool> splat(bool _value) { return _mm256_set1_epi8(uint8_t(-(!!_value))); }
simdjson_inline simd8<bool>() : base8() {}
simdjson_inline simd8<bool>(const __m256i _value) : base8<bool>(_value) {}
// Splat constructor
simdjson_inline simd8<bool>(bool _value) : base8<bool>(splat(_value)) {}
simdjson_inline int to_bitmask() const { return _mm256_movemask_epi8(*this); }
simdjson_inline bool any() const { return !_mm256_testz_si256(*this, *this); }
simdjson_inline simd8<bool> operator~() const { return *this ^ true; }
};
template<typename T>
struct base8_numeric: base8<T> {
static simdjson_inline simd8<T> splat(T _value) { return _mm256_set1_epi8(_value); }
static simdjson_inline simd8<T> zero() { return _mm256_setzero_si256(); }
static simdjson_inline simd8<T> load(const T values[32]) {
return _mm256_loadu_si256(reinterpret_cast<const __m256i *>(values));
}
// Repeat 16 values as many times as necessary (usually for lookup tables)
static simdjson_inline simd8<T> repeat_16(
T v0, T v1, T v2, T v3, T v4, T v5, T v6, T v7,
T v8, T v9, T v10, T v11, T v12, T v13, T v14, T v15
) {
return simd8<T>(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15,
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
);
}
simdjson_inline base8_numeric() : base8<T>() {}
simdjson_inline base8_numeric(const __m256i _value) : base8<T>(_value) {}
// Store to array
simdjson_inline void store(T dst[32]) const { return _mm256_storeu_si256(reinterpret_cast<__m256i *>(dst), *this); }
// Addition/subtraction are the same for signed and unsigned
simdjson_inline simd8<T> operator+(const simd8<T> other) const { return _mm256_add_epi8(*this, other); }
simdjson_inline simd8<T> operator-(const simd8<T> other) const { return _mm256_sub_epi8(*this, other); }
simdjson_inline simd8<T>& operator+=(const simd8<T> other) { *this = *this + other; return *static_cast<simd8<T>*>(this); }
simdjson_inline simd8<T>& operator-=(const simd8<T> other) { *this = *this - other; return *static_cast<simd8<T>*>(this); }
// Override to distinguish from bool version
simdjson_inline simd8<T> operator~() const { return *this ^ 0xFFu; }
// Perform a lookup assuming the value is between 0 and 16 (undefined behavior for out of range values)
template<typename L>
simdjson_inline simd8<L> lookup_16(simd8<L> lookup_table) const {
return _mm256_shuffle_epi8(lookup_table, *this);
}
// Copies to 'output" all bytes corresponding to a 0 in the mask (interpreted as a bitset).
// Passing a 0 value for mask would be equivalent to writing out every byte to output.
// Only the first 32 - count_ones(mask) bytes of the result are significant but 32 bytes
// get written.
// Design consideration: it seems like a function with the
// signature simd8<L> compress(uint32_t mask) would be
// sensible, but the AVX ISA makes this kind of approach difficult.
template<typename L>
simdjson_inline void compress(uint32_t mask, L * output) const {
using internal::thintable_epi8;
using internal::BitsSetTable256mul2;
using internal::pshufb_combine_table;
// this particular implementation was inspired by work done by @animetosho
// we do it in four steps, first 8 bytes and then second 8 bytes...
uint8_t mask1 = uint8_t(mask); // least significant 8 bits
uint8_t mask2 = uint8_t(mask >> 8); // second least significant 8 bits
uint8_t mask3 = uint8_t(mask >> 16); // ...
uint8_t mask4 = uint8_t(mask >> 24); // ...
// next line just loads the 64-bit values thintable_epi8[mask1] and
// thintable_epi8[mask2] into a 128-bit register, using only
// two instructions on most compilers.
__m256i shufmask = _mm256_set_epi64x(thintable_epi8[mask4], thintable_epi8[mask3],
thintable_epi8[mask2], thintable_epi8[mask1]);
// we increment by 0x08 the second half of the mask and so forth
shufmask =
_mm256_add_epi8(shufmask, _mm256_set_epi32(0x18181818, 0x18181818,
0x10101010, 0x10101010, 0x08080808, 0x08080808, 0, 0));
// this is the version "nearly pruned"
__m256i pruned = _mm256_shuffle_epi8(*this, shufmask);
// we still need to put the pieces back together.
// we compute the popcount of the first words:
int pop1 = BitsSetTable256mul2[mask1];
int pop3 = BitsSetTable256mul2[mask3];
// then load the corresponding mask
// could be done with _mm256_loadu2_m128i but many standard libraries omit this intrinsic.
__m256i v256 = _mm256_castsi128_si256(
_mm_loadu_si128(reinterpret_cast<const __m128i *>(pshufb_combine_table + pop1 * 8)));
__m256i compactmask = _mm256_insertf128_si256(v256,
_mm_loadu_si128(reinterpret_cast<const __m128i *>(pshufb_combine_table + pop3 * 8)), 1);
__m256i almostthere = _mm256_shuffle_epi8(pruned, compactmask);
// We just need to write out the result.
// This is the tricky bit that is hard to do
// if we want to return a SIMD register, since there
// is no single-instruction approach to recombine
// the two 128-bit lanes with an offset.
__m128i v128;
v128 = _mm256_castsi256_si128(almostthere);
_mm_storeu_si128( reinterpret_cast<__m128i *>(output), v128);
v128 = _mm256_extractf128_si256(almostthere, 1);
_mm_storeu_si128( reinterpret_cast<__m128i *>(output + 16 - count_ones(mask & 0xFFFF)), v128);
}
template<typename L>
simdjson_inline simd8<L> lookup_16(
L replace0, L replace1, L replace2, L replace3,
L replace4, L replace5, L replace6, L replace7,
L replace8, L replace9, L replace10, L replace11,
L replace12, L replace13, L replace14, L replace15) const {
return lookup_16(simd8<L>::repeat_16(
replace0, replace1, replace2, replace3,
replace4, replace5, replace6, replace7,
replace8, replace9, replace10, replace11,
replace12, replace13, replace14, replace15
));
}
};
// Signed bytes
template<>
struct simd8<int8_t> : base8_numeric<int8_t> {
simdjson_inline simd8() : base8_numeric<int8_t>() {}
simdjson_inline simd8(const __m256i _value) : base8_numeric<int8_t>(_value) {}
// Splat constructor
simdjson_inline simd8(int8_t _value) : simd8(splat(_value)) {}
// Array constructor
simdjson_inline simd8(const int8_t values[32]) : simd8(load(values)) {}
// Member-by-member initialization
simdjson_inline simd8(
int8_t v0, int8_t v1, int8_t v2, int8_t v3, int8_t v4, int8_t v5, int8_t v6, int8_t v7,
int8_t v8, int8_t v9, int8_t v10, int8_t v11, int8_t v12, int8_t v13, int8_t v14, int8_t v15,
int8_t v16, int8_t v17, int8_t v18, int8_t v19, int8_t v20, int8_t v21, int8_t v22, int8_t v23,
int8_t v24, int8_t v25, int8_t v26, int8_t v27, int8_t v28, int8_t v29, int8_t v30, int8_t v31
) : simd8(_mm256_setr_epi8(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15,
v16,v17,v18,v19,v20,v21,v22,v23,
v24,v25,v26,v27,v28,v29,v30,v31
)) {}
// Repeat 16 values as many times as necessary (usually for lookup tables)
simdjson_inline static simd8<int8_t> repeat_16(
int8_t v0, int8_t v1, int8_t v2, int8_t v3, int8_t v4, int8_t v5, int8_t v6, int8_t v7,
int8_t v8, int8_t v9, int8_t v10, int8_t v11, int8_t v12, int8_t v13, int8_t v14, int8_t v15
) {
return simd8<int8_t>(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15,
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
);
}
// Order-sensitive comparisons
simdjson_inline simd8<int8_t> max_val(const simd8<int8_t> other) const { return _mm256_max_epi8(*this, other); }
simdjson_inline simd8<int8_t> min_val(const simd8<int8_t> other) const { return _mm256_min_epi8(*this, other); }
simdjson_inline simd8<bool> operator>(const simd8<int8_t> other) const { return _mm256_cmpgt_epi8(*this, other); }
simdjson_inline simd8<bool> operator<(const simd8<int8_t> other) const { return _mm256_cmpgt_epi8(other, *this); }
};
// Unsigned bytes
template<>
struct simd8<uint8_t>: base8_numeric<uint8_t> {
simdjson_inline simd8() : base8_numeric<uint8_t>() {}
simdjson_inline simd8(const __m256i _value) : base8_numeric<uint8_t>(_value) {}
// Splat constructor
simdjson_inline simd8(uint8_t _value) : simd8(splat(_value)) {}
// Array constructor
simdjson_inline simd8(const uint8_t values[32]) : simd8(load(values)) {}
// Member-by-member initialization
simdjson_inline simd8(
uint8_t v0, uint8_t v1, uint8_t v2, uint8_t v3, uint8_t v4, uint8_t v5, uint8_t v6, uint8_t v7,
uint8_t v8, uint8_t v9, uint8_t v10, uint8_t v11, uint8_t v12, uint8_t v13, uint8_t v14, uint8_t v15,
uint8_t v16, uint8_t v17, uint8_t v18, uint8_t v19, uint8_t v20, uint8_t v21, uint8_t v22, uint8_t v23,
uint8_t v24, uint8_t v25, uint8_t v26, uint8_t v27, uint8_t v28, uint8_t v29, uint8_t v30, uint8_t v31
) : simd8(_mm256_setr_epi8(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15,
v16,v17,v18,v19,v20,v21,v22,v23,
v24,v25,v26,v27,v28,v29,v30,v31
)) {}
// Repeat 16 values as many times as necessary (usually for lookup tables)
simdjson_inline static simd8<uint8_t> repeat_16(
uint8_t v0, uint8_t v1, uint8_t v2, uint8_t v3, uint8_t v4, uint8_t v5, uint8_t v6, uint8_t v7,
uint8_t v8, uint8_t v9, uint8_t v10, uint8_t v11, uint8_t v12, uint8_t v13, uint8_t v14, uint8_t v15
) {
return simd8<uint8_t>(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15,
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
);
}
// Saturated math
simdjson_inline simd8<uint8_t> saturating_add(const simd8<uint8_t> other) const { return _mm256_adds_epu8(*this, other); }
simdjson_inline simd8<uint8_t> saturating_sub(const simd8<uint8_t> other) const { return _mm256_subs_epu8(*this, other); }
// Order-specific operations
simdjson_inline simd8<uint8_t> max_val(const simd8<uint8_t> other) const { return _mm256_max_epu8(*this, other); }
simdjson_inline simd8<uint8_t> min_val(const simd8<uint8_t> other) const { return _mm256_min_epu8(other, *this); }
// Same as >, but only guarantees true is nonzero (< guarantees true = -1)
simdjson_inline simd8<uint8_t> gt_bits(const simd8<uint8_t> other) const { return this->saturating_sub(other); }
// Same as <, but only guarantees true is nonzero (< guarantees true = -1)
simdjson_inline simd8<uint8_t> lt_bits(const simd8<uint8_t> other) const { return other.saturating_sub(*this); }
simdjson_inline simd8<bool> operator<=(const simd8<uint8_t> other) const { return other.max_val(*this) == other; }
simdjson_inline simd8<bool> operator>=(const simd8<uint8_t> other) const { return other.min_val(*this) == other; }
simdjson_inline simd8<bool> operator>(const simd8<uint8_t> other) const { return this->gt_bits(other).any_bits_set(); }
simdjson_inline simd8<bool> operator<(const simd8<uint8_t> other) const { return this->lt_bits(other).any_bits_set(); }
// Bit-specific operations
simdjson_inline simd8<bool> bits_not_set() const { return *this == uint8_t(0); }
simdjson_inline simd8<bool> bits_not_set(simd8<uint8_t> bits) const { return (*this & bits).bits_not_set(); }
simdjson_inline simd8<bool> any_bits_set() const { return ~this->bits_not_set(); }
simdjson_inline simd8<bool> any_bits_set(simd8<uint8_t> bits) const { return ~this->bits_not_set(bits); }
simdjson_inline bool is_ascii() const { return _mm256_movemask_epi8(*this) == 0; }
simdjson_inline bool bits_not_set_anywhere() const { return _mm256_testz_si256(*this, *this); }
simdjson_inline bool any_bits_set_anywhere() const { return !bits_not_set_anywhere(); }
simdjson_inline bool bits_not_set_anywhere(simd8<uint8_t> bits) const { return _mm256_testz_si256(*this, bits); }
simdjson_inline bool any_bits_set_anywhere(simd8<uint8_t> bits) const { return !bits_not_set_anywhere(bits); }
template<int N>
simdjson_inline simd8<uint8_t> shr() const { return simd8<uint8_t>(_mm256_srli_epi16(*this, N)) & uint8_t(0xFFu >> N); }
template<int N>
simdjson_inline simd8<uint8_t> shl() const { return simd8<uint8_t>(_mm256_slli_epi16(*this, N)) & uint8_t(0xFFu << N); }
// Get one of the bits and make a bitmask out of it.
// e.g. value.get_bit<7>() gets the high bit
template<int N>
simdjson_inline int get_bit() const { return _mm256_movemask_epi8(_mm256_slli_epi16(*this, 7-N)); }
};
template<typename T>
struct simd8x64 {
static constexpr int NUM_CHUNKS = 64 / sizeof(simd8<T>);
static_assert(NUM_CHUNKS == 2, "Haswell kernel should use two registers per 64-byte block.");
const simd8<T> chunks[NUM_CHUNKS];
simd8x64(const simd8x64<T>& o) = delete; // no copy allowed
simd8x64<T>& operator=(const simd8<T>& other) = delete; // no assignment allowed
simd8x64() = delete; // no default constructor allowed
simdjson_inline simd8x64(const simd8<T> chunk0, const simd8<T> chunk1) : chunks{chunk0, chunk1} {}
simdjson_inline simd8x64(const T ptr[64]) : chunks{simd8<T>::load(ptr), simd8<T>::load(ptr+32)} {}
simdjson_inline uint64_t compress(uint64_t mask, T * output) const {
uint32_t mask1 = uint32_t(mask);
uint32_t mask2 = uint32_t(mask >> 32);
this->chunks[0].compress(mask1, output);
this->chunks[1].compress(mask2, output + 32 - count_ones(mask1));
return 64 - count_ones(mask);
}
simdjson_inline void store(T ptr[64]) const {
this->chunks[0].store(ptr+sizeof(simd8<T>)*0);
this->chunks[1].store(ptr+sizeof(simd8<T>)*1);
}
simdjson_inline uint64_t to_bitmask() const {
uint64_t r_lo = uint32_t(this->chunks[0].to_bitmask());
uint64_t r_hi = this->chunks[1].to_bitmask();
return r_lo | (r_hi << 32);
}
simdjson_inline simd8<T> reduce_or() const {
return this->chunks[0] | this->chunks[1];
}
simdjson_inline simd8x64<T> bit_or(const T m) const {
const simd8<T> mask = simd8<T>::splat(m);
return simd8x64<T>(
this->chunks[0] | mask,
this->chunks[1] | mask
);
}
simdjson_inline uint64_t eq(const T m) const {
const simd8<T> mask = simd8<T>::splat(m);
return simd8x64<bool>(
this->chunks[0] == mask,
this->chunks[1] == mask
).to_bitmask();
}
simdjson_inline uint64_t eq(const simd8x64<uint8_t> &other) const {
return simd8x64<bool>(
this->chunks[0] == other.chunks[0],
this->chunks[1] == other.chunks[1]
).to_bitmask();
}
simdjson_inline uint64_t lteq(const T m) const {
const simd8<T> mask = simd8<T>::splat(m);
return simd8x64<bool>(
this->chunks[0] <= mask,
this->chunks[1] <= mask
).to_bitmask();
}
}; // struct simd8x64<T>
} // namespace simd
} // unnamed namespace
} // namespace haswell
} // namespace simdjson
#endif // SIMDJSON_HASWELL_SIMD_H
/* end file simdjson/haswell/simd.h */
/* including simdjson/haswell/stringparsing_defs.h: #include "simdjson/haswell/stringparsing_defs.h" */
/* begin file simdjson/haswell/stringparsing_defs.h */
#ifndef SIMDJSON_HASWELL_STRINGPARSING_DEFS_H
#define SIMDJSON_HASWELL_STRINGPARSING_DEFS_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/haswell/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/haswell/simd.h" */
/* amalgamation skipped (editor-only): #include "simdjson/haswell/bitmanipulation.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace haswell {
namespace {
using namespace simd;
// Holds backslashes and quotes locations.
struct backslash_and_quote {
public:
static constexpr uint32_t BYTES_PROCESSED = 32;
simdjson_inline static backslash_and_quote copy_and_find(const uint8_t *src, uint8_t *dst);
simdjson_inline bool has_quote_first() { return ((bs_bits - 1) & quote_bits) != 0; }
simdjson_inline bool has_backslash() { return ((quote_bits - 1) & bs_bits) != 0; }
simdjson_inline int quote_index() { return trailing_zeroes(quote_bits); }
simdjson_inline int backslash_index() { return trailing_zeroes(bs_bits); }
uint32_t bs_bits;
uint32_t quote_bits;
}; // struct backslash_and_quote
simdjson_inline backslash_and_quote backslash_and_quote::copy_and_find(const uint8_t *src, uint8_t *dst) {
// this can read up to 15 bytes beyond the buffer size, but we require
// SIMDJSON_PADDING of padding
static_assert(SIMDJSON_PADDING >= (BYTES_PROCESSED - 1), "backslash and quote finder must process fewer than SIMDJSON_PADDING bytes");
simd8<uint8_t> v(src);
// store to dest unconditionally - we can overwrite the bits we don't like later
v.store(dst);
return {
static_cast<uint32_t>((v == '\\').to_bitmask()), // bs_bits
static_cast<uint32_t>((v == '"').to_bitmask()), // quote_bits
};
}
} // unnamed namespace
} // namespace haswell
} // namespace simdjson
#endif // SIMDJSON_HASWELL_STRINGPARSING_DEFS_H
/* end file simdjson/haswell/stringparsing_defs.h */
/* end file simdjson/haswell/begin.h */
/* including simdjson/generic/amalgamated.h for haswell: #include "simdjson/generic/amalgamated.h" */
/* begin file simdjson/generic/amalgamated.h for haswell */
#if defined(SIMDJSON_CONDITIONAL_INCLUDE) && !defined(SIMDJSON_GENERIC_DEPENDENCIES_H)
#error simdjson/generic/dependencies.h must be included before simdjson/generic/amalgamated.h!
#endif
/* including simdjson/generic/base.h for haswell: #include "simdjson/generic/base.h" */
/* begin file simdjson/generic/base.h for haswell */
#ifndef SIMDJSON_GENERIC_BASE_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_GENERIC_BASE_H */
/* amalgamation skipped (editor-only): #include "simdjson/base.h" */
/* amalgamation skipped (editor-only): // If we haven't got an implementation yet, we're in the editor, editing a generic file! Just */
/* amalgamation skipped (editor-only): // use the most advanced one we can so the most possible stuff can be tested. */
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_IMPLEMENTATION */
/* amalgamation skipped (editor-only): #include "simdjson/implementation_detection.h" */
/* amalgamation skipped (editor-only): #if SIMDJSON_IMPLEMENTATION_ICELAKE */
/* amalgamation skipped (editor-only): #include "simdjson/icelake/begin.h" */
/* amalgamation skipped (editor-only): #elif SIMDJSON_IMPLEMENTATION_HASWELL */
/* amalgamation skipped (editor-only): #include "simdjson/haswell/begin.h" */
/* amalgamation skipped (editor-only): #elif SIMDJSON_IMPLEMENTATION_WESTMERE */
/* amalgamation skipped (editor-only): #include "simdjson/westmere/begin.h" */
/* amalgamation skipped (editor-only): #elif SIMDJSON_IMPLEMENTATION_ARM64 */
/* amalgamation skipped (editor-only): #include "simdjson/arm64/begin.h" */
/* amalgamation skipped (editor-only): #elif SIMDJSON_IMPLEMENTATION_PPC64 */
/* amalgamation skipped (editor-only): #include "simdjson/ppc64/begin.h" */
/* amalgamation skipped (editor-only): #elif SIMDJSON_IMPLEMENTATION_FALLBACK */
/* amalgamation skipped (editor-only): #include "simdjson/fallback/begin.h" */
/* amalgamation skipped (editor-only): #else */
/* amalgamation skipped (editor-only): #error "All possible implementations (including fallback) have been disabled! simdjson will not run." */
/* amalgamation skipped (editor-only): #endif */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_IMPLEMENTATION */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace haswell {
struct open_container;
class dom_parser_implementation;
/**
* The type of a JSON number
*/
enum class number_type {
floating_point_number=1, /// a binary64 number
signed_integer, /// a signed integer that fits in a 64-bit word using two's complement
unsigned_integer, /// a positive integer larger or equal to 1<<63
big_integer /// a big integer that does not fit in a 64-bit word
};
} // namespace haswell
} // namespace simdjson
#endif // SIMDJSON_GENERIC_BASE_H
/* end file simdjson/generic/base.h for haswell */
/* including simdjson/generic/jsoncharutils.h for haswell: #include "simdjson/generic/jsoncharutils.h" */
/* begin file simdjson/generic/jsoncharutils.h for haswell */
#ifndef SIMDJSON_GENERIC_JSONCHARUTILS_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_GENERIC_JSONCHARUTILS_H */
/* amalgamation skipped (editor-only): #include "simdjson/generic/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/jsoncharutils_tables.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/numberparsing_tables.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace haswell {
namespace {
namespace jsoncharutils {
// return non-zero if not a structural or whitespace char
// zero otherwise
simdjson_inline uint32_t is_not_structural_or_whitespace(uint8_t c) {
return internal::structural_or_whitespace_negated[c];
}
simdjson_inline uint32_t is_structural_or_whitespace(uint8_t c) {
return internal::structural_or_whitespace[c];
}
// returns a value with the high 16 bits set if not valid
// otherwise returns the conversion of the 4 hex digits at src into the bottom
// 16 bits of the 32-bit return register
//
// see
// https://lemire.me/blog/2019/04/17/parsing-short-hexadecimal-strings-efficiently/
static inline uint32_t hex_to_u32_nocheck(
const uint8_t *src) { // strictly speaking, static inline is a C-ism
uint32_t v1 = internal::digit_to_val32[630 + src[0]];
uint32_t v2 = internal::digit_to_val32[420 + src[1]];
uint32_t v3 = internal::digit_to_val32[210 + src[2]];
uint32_t v4 = internal::digit_to_val32[0 + src[3]];
return v1 | v2 | v3 | v4;
}
// given a code point cp, writes to c
// the utf-8 code, outputting the length in
// bytes, if the length is zero, the code point
// is invalid
//
// This can possibly be made faster using pdep
// and clz and table lookups, but JSON documents
// have few escaped code points, and the following
// function looks cheap.
//
// Note: we assume that surrogates are treated separately
//
simdjson_inline size_t codepoint_to_utf8(uint32_t cp, uint8_t *c) {
if (cp <= 0x7F) {
c[0] = uint8_t(cp);
return 1; // ascii
}
if (cp <= 0x7FF) {
c[0] = uint8_t((cp >> 6) + 192);
c[1] = uint8_t((cp & 63) + 128);
return 2; // universal plane
// Surrogates are treated elsewhere...
//} //else if (0xd800 <= cp && cp <= 0xdfff) {
// return 0; // surrogates // could put assert here
} else if (cp <= 0xFFFF) {
c[0] = uint8_t((cp >> 12) + 224);
c[1] = uint8_t(((cp >> 6) & 63) + 128);
c[2] = uint8_t((cp & 63) + 128);
return 3;
} else if (cp <= 0x10FFFF) { // if you know you have a valid code point, this
// is not needed
c[0] = uint8_t((cp >> 18) + 240);
c[1] = uint8_t(((cp >> 12) & 63) + 128);
c[2] = uint8_t(((cp >> 6) & 63) + 128);
c[3] = uint8_t((cp & 63) + 128);
return 4;
}
// will return 0 when the code point was too large.
return 0; // bad r
}
#if SIMDJSON_IS_32BITS // _umul128 for x86, arm
// this is a slow emulation routine for 32-bit
//
static simdjson_inline uint64_t __emulu(uint32_t x, uint32_t y) {
return x * (uint64_t)y;
}
static simdjson_inline uint64_t _umul128(uint64_t ab, uint64_t cd, uint64_t *hi) {
uint64_t ad = __emulu((uint32_t)(ab >> 32), (uint32_t)cd);
uint64_t bd = __emulu((uint32_t)ab, (uint32_t)cd);
uint64_t adbc = ad + __emulu((uint32_t)ab, (uint32_t)(cd >> 32));
uint64_t adbc_carry = !!(adbc < ad);
uint64_t lo = bd + (adbc << 32);
*hi = __emulu((uint32_t)(ab >> 32), (uint32_t)(cd >> 32)) + (adbc >> 32) +
(adbc_carry << 32) + !!(lo < bd);
return lo;
}
#endif
} // namespace jsoncharutils
} // unnamed namespace
} // namespace haswell
} // namespace simdjson
#endif // SIMDJSON_GENERIC_JSONCHARUTILS_H
/* end file simdjson/generic/jsoncharutils.h for haswell */
/* including simdjson/generic/atomparsing.h for haswell: #include "simdjson/generic/atomparsing.h" */
/* begin file simdjson/generic/atomparsing.h for haswell */
#ifndef SIMDJSON_GENERIC_ATOMPARSING_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_GENERIC_ATOMPARSING_H */
/* amalgamation skipped (editor-only): #include "simdjson/generic/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/generic/jsoncharutils.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#include <cstring>
namespace simdjson {
namespace haswell {
namespace {
/// @private
namespace atomparsing {
// The string_to_uint32 is exclusively used to map literal strings to 32-bit values.
// We use memcpy instead of a pointer cast to avoid undefined behaviors since we cannot
// be certain that the character pointer will be properly aligned.
// You might think that using memcpy makes this function expensive, but you'd be wrong.
// All decent optimizing compilers (GCC, clang, Visual Studio) will compile string_to_uint32("false");
// to the compile-time constant 1936482662.
simdjson_inline uint32_t string_to_uint32(const char* str) { uint32_t val; std::memcpy(&val, str, sizeof(uint32_t)); return val; }
// Again in str4ncmp we use a memcpy to avoid undefined behavior. The memcpy may appear expensive.
// Yet all decent optimizing compilers will compile memcpy to a single instruction, just about.
simdjson_warn_unused
simdjson_inline uint32_t str4ncmp(const uint8_t *src, const char* atom) {
uint32_t srcval; // we want to avoid unaligned 32-bit loads (undefined in C/C++)
static_assert(sizeof(uint32_t) <= SIMDJSON_PADDING, "SIMDJSON_PADDING must be larger than 4 bytes");
std::memcpy(&srcval, src, sizeof(uint32_t));
return srcval ^ string_to_uint32(atom);
}
simdjson_warn_unused
simdjson_inline bool is_valid_true_atom(const uint8_t *src) {
return (str4ncmp(src, "true") | jsoncharutils::is_not_structural_or_whitespace(src[4])) == 0;
}
simdjson_warn_unused
simdjson_inline bool is_valid_true_atom(const uint8_t *src, size_t len) {
if (len > 4) { return is_valid_true_atom(src); }
else if (len == 4) { return !str4ncmp(src, "true"); }
else { return false; }
}
simdjson_warn_unused
simdjson_inline bool is_valid_false_atom(const uint8_t *src) {
return (str4ncmp(src+1, "alse") | jsoncharutils::is_not_structural_or_whitespace(src[5])) == 0;
}
simdjson_warn_unused
simdjson_inline bool is_valid_false_atom(const uint8_t *src, size_t len) {
if (len > 5) { return is_valid_false_atom(src); }
else if (len == 5) { return !str4ncmp(src+1, "alse"); }
else { return false; }
}
simdjson_warn_unused
simdjson_inline bool is_valid_null_atom(const uint8_t *src) {
return (str4ncmp(src, "null") | jsoncharutils::is_not_structural_or_whitespace(src[4])) == 0;
}
simdjson_warn_unused
simdjson_inline bool is_valid_null_atom(const uint8_t *src, size_t len) {
if (len > 4) { return is_valid_null_atom(src); }
else if (len == 4) { return !str4ncmp(src, "null"); }
else { return false; }
}
} // namespace atomparsing
} // unnamed namespace
} // namespace haswell
} // namespace simdjson
#endif // SIMDJSON_GENERIC_ATOMPARSING_H
/* end file simdjson/generic/atomparsing.h for haswell */
/* including simdjson/generic/dom_parser_implementation.h for haswell: #include "simdjson/generic/dom_parser_implementation.h" */
/* begin file simdjson/generic/dom_parser_implementation.h for haswell */
#ifndef SIMDJSON_GENERIC_DOM_PARSER_IMPLEMENTATION_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_GENERIC_DOM_PARSER_IMPLEMENTATION_H */
/* amalgamation skipped (editor-only): #include "simdjson/generic/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/dom_parser_implementation.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace haswell {
// expectation: sizeof(open_container) = 64/8.
struct open_container {
uint32_t tape_index; // where, on the tape, does the scope ([,{) begins
uint32_t count; // how many elements in the scope
}; // struct open_container
static_assert(sizeof(open_container) == 64/8, "Open container must be 64 bits");
class dom_parser_implementation final : public internal::dom_parser_implementation {
public:
/** Tape location of each open { or [ */
std::unique_ptr<open_container[]> open_containers{};
/** Whether each open container is a [ or { */
std::unique_ptr<bool[]> is_array{};
/** Buffer passed to stage 1 */
const uint8_t *buf{};
/** Length passed to stage 1 */
size_t len{0};
/** Document passed to stage 2 */
dom::document *doc{};
inline dom_parser_implementation() noexcept;
inline dom_parser_implementation(dom_parser_implementation &&other) noexcept;
inline dom_parser_implementation &operator=(dom_parser_implementation &&other) noexcept;
dom_parser_implementation(const dom_parser_implementation &) = delete;
dom_parser_implementation &operator=(const dom_parser_implementation &) = delete;
simdjson_warn_unused error_code parse(const uint8_t *buf, size_t len, dom::document &doc) noexcept final;
simdjson_warn_unused error_code stage1(const uint8_t *buf, size_t len, stage1_mode partial) noexcept final;
simdjson_warn_unused error_code stage2(dom::document &doc) noexcept final;
simdjson_warn_unused error_code stage2_next(dom::document &doc) noexcept final;
simdjson_warn_unused uint8_t *parse_string(const uint8_t *src, uint8_t *dst, bool allow_replacement) const noexcept final;
simdjson_warn_unused uint8_t *parse_wobbly_string(const uint8_t *src, uint8_t *dst) const noexcept final;
inline simdjson_warn_unused error_code set_capacity(size_t capacity) noexcept final;
inline simdjson_warn_unused error_code set_max_depth(size_t max_depth) noexcept final;
private:
simdjson_inline simdjson_warn_unused error_code set_capacity_stage1(size_t capacity);
};
} // namespace haswell
} // namespace simdjson
namespace simdjson {
namespace haswell {
inline dom_parser_implementation::dom_parser_implementation() noexcept = default;
inline dom_parser_implementation::dom_parser_implementation(dom_parser_implementation &&other) noexcept = default;
inline dom_parser_implementation &dom_parser_implementation::operator=(dom_parser_implementation &&other) noexcept = default;
// Leaving these here so they can be inlined if so desired
inline simdjson_warn_unused error_code dom_parser_implementation::set_capacity(size_t capacity) noexcept {
if(capacity > SIMDJSON_MAXSIZE_BYTES) { return CAPACITY; }
// Stage 1 index output
size_t max_structures = SIMDJSON_ROUNDUP_N(capacity, 64) + 2 + 7;
structural_indexes.reset( new (std::nothrow) uint32_t[max_structures] );
if (!structural_indexes) { _capacity = 0; return MEMALLOC; }
structural_indexes[0] = 0;
n_structural_indexes = 0;
_capacity = capacity;
return SUCCESS;
}
inline simdjson_warn_unused error_code dom_parser_implementation::set_max_depth(size_t max_depth) noexcept {
// Stage 2 stacks
open_containers.reset(new (std::nothrow) open_container[max_depth]);
is_array.reset(new (std::nothrow) bool[max_depth]);
if (!is_array || !open_containers) { _max_depth = 0; return MEMALLOC; }
_max_depth = max_depth;
return SUCCESS;
}
} // namespace haswell
} // namespace simdjson
#endif // SIMDJSON_GENERIC_DOM_PARSER_IMPLEMENTATION_H
/* end file simdjson/generic/dom_parser_implementation.h for haswell */
/* including simdjson/generic/implementation_simdjson_result_base.h for haswell: #include "simdjson/generic/implementation_simdjson_result_base.h" */
/* begin file simdjson/generic/implementation_simdjson_result_base.h for haswell */
#ifndef SIMDJSON_GENERIC_IMPLEMENTATION_SIMDJSON_RESULT_BASE_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_GENERIC_IMPLEMENTATION_SIMDJSON_RESULT_BASE_H */
/* amalgamation skipped (editor-only): #include "simdjson/generic/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace haswell {
// This is a near copy of include/error.h's implementation_simdjson_result_base, except it doesn't use std::pair
// so we can avoid inlining errors
// TODO reconcile these!
/**
* The result of a simdjson operation that could fail.
*
* Gives the option of reading error codes, or throwing an exception by casting to the desired result.
*
* This is a base class for implementations that want to add functions to the result type for
* chaining.
*
* Override like:
*
* struct simdjson_result<T> : public internal::implementation_simdjson_result_base<T> {
* simdjson_result() noexcept : internal::implementation_simdjson_result_base<T>() {}
* simdjson_result(error_code error) noexcept : internal::implementation_simdjson_result_base<T>(error) {}
* simdjson_result(T &&value) noexcept : internal::implementation_simdjson_result_base<T>(std::forward(value)) {}
* simdjson_result(T &&value, error_code error) noexcept : internal::implementation_simdjson_result_base<T>(value, error) {}
* // Your extra methods here
* }
*
* Then any method returning simdjson_result<T> will be chainable with your methods.
*/
template<typename T>
struct implementation_simdjson_result_base {
/**
* Create a new empty result with error = UNINITIALIZED.
*/
simdjson_inline implementation_simdjson_result_base() noexcept = default;
/**
* Create a new error result.
*/
simdjson_inline implementation_simdjson_result_base(error_code error) noexcept;
/**
* Create a new successful result.
*/
simdjson_inline implementation_simdjson_result_base(T &&value) noexcept;
/**
* Create a new result with both things (use if you don't want to branch when creating the result).
*/
simdjson_inline implementation_simdjson_result_base(T &&value, error_code error) noexcept;
/**
* Move the value and the error to the provided variables.
*
* @param value The variable to assign the value to. May not be set if there is an error.
* @param error The variable to assign the error to. Set to SUCCESS if there is no error.
*/
simdjson_inline void tie(T &value, error_code &error) && noexcept;
/**
* Move the value to the provided variable.
*
* @param value The variable to assign the value to. May not be set if there is an error.
*/
simdjson_inline error_code get(T &value) && noexcept;
/**
* The error.
*/
simdjson_inline error_code error() const noexcept;
#if SIMDJSON_EXCEPTIONS
/**
* Get the result value.
*
* @throw simdjson_error if there was an error.
*/
simdjson_inline T& value() & noexcept(false);
/**
* Take the result value (move it).
*
* @throw simdjson_error if there was an error.
*/
simdjson_inline T&& value() && noexcept(false);
/**
* Take the result value (move it).
*
* @throw simdjson_error if there was an error.
*/
simdjson_inline T&& take_value() && noexcept(false);
/**
* Cast to the value (will throw on error).
*
* @throw simdjson_error if there was an error.
*/
simdjson_inline operator T&&() && noexcept(false);
#endif // SIMDJSON_EXCEPTIONS
/**
* Get the result value. This function is safe if and only
* the error() method returns a value that evaluates to false.
*/
simdjson_inline const T& value_unsafe() const& noexcept;
/**
* Get the result value. This function is safe if and only
* the error() method returns a value that evaluates to false.
*/
simdjson_inline T& value_unsafe() & noexcept;
/**
* Take the result value (move it). This function is safe if and only
* the error() method returns a value that evaluates to false.
*/
simdjson_inline T&& value_unsafe() && noexcept;
protected:
/** users should never directly access first and second. **/
T first{}; /** Users should never directly access 'first'. **/
error_code second{UNINITIALIZED}; /** Users should never directly access 'second'. **/
}; // struct implementation_simdjson_result_base
} // namespace haswell
} // namespace simdjson
#endif // SIMDJSON_GENERIC_IMPLEMENTATION_SIMDJSON_RESULT_BASE_H
/* end file simdjson/generic/implementation_simdjson_result_base.h for haswell */
/* including simdjson/generic/numberparsing.h for haswell: #include "simdjson/generic/numberparsing.h" */
/* begin file simdjson/generic/numberparsing.h for haswell */
#ifndef SIMDJSON_GENERIC_NUMBERPARSING_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_GENERIC_NUMBERPARSING_H */
/* amalgamation skipped (editor-only): #include "simdjson/generic/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/generic/jsoncharutils.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/numberparsing_tables.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#include <limits>
#include <ostream>
#include <cstring>
namespace simdjson {
namespace haswell {
namespace numberparsing {
#ifdef JSON_TEST_NUMBERS
#define INVALID_NUMBER(SRC) (found_invalid_number((SRC)), NUMBER_ERROR)
#define WRITE_INTEGER(VALUE, SRC, WRITER) (found_integer((VALUE), (SRC)), (WRITER).append_s64((VALUE)))
#define WRITE_UNSIGNED(VALUE, SRC, WRITER) (found_unsigned_integer((VALUE), (SRC)), (WRITER).append_u64((VALUE)))
#define WRITE_DOUBLE(VALUE, SRC, WRITER) (found_float((VALUE), (SRC)), (WRITER).append_double((VALUE)))
#define BIGINT_NUMBER(SRC) (found_invalid_number((SRC)), BIGINT_ERROR)
#else
#define INVALID_NUMBER(SRC) (NUMBER_ERROR)
#define WRITE_INTEGER(VALUE, SRC, WRITER) (WRITER).append_s64((VALUE))
#define WRITE_UNSIGNED(VALUE, SRC, WRITER) (WRITER).append_u64((VALUE))
#define WRITE_DOUBLE(VALUE, SRC, WRITER) (WRITER).append_double((VALUE))
#define BIGINT_NUMBER(SRC) (BIGINT_ERROR)
#endif
namespace {
// Convert a mantissa, an exponent and a sign bit into an ieee64 double.
// The real_exponent needs to be in [0, 2046] (technically real_exponent = 2047 would be acceptable).
// The mantissa should be in [0,1<<53). The bit at index (1ULL << 52) while be zeroed.
simdjson_inline double to_double(uint64_t mantissa, uint64_t real_exponent, bool negative) {
double d;
mantissa &= ~(1ULL << 52);
mantissa |= real_exponent << 52;
mantissa |= ((static_cast<uint64_t>(negative)) << 63);
std::memcpy(&d, &mantissa, sizeof(d));
return d;
}
// Attempts to compute i * 10^(power) exactly; and if "negative" is
// true, negate the result.
// This function will only work in some cases, when it does not work, success is
// set to false. This should work *most of the time* (like 99% of the time).
// We assume that power is in the [smallest_power,
// largest_power] interval: the caller is responsible for this check.
simdjson_inline bool compute_float_64(int64_t power, uint64_t i, bool negative, double &d) {
// we start with a fast path
// It was described in
// Clinger WD. How to read floating point numbers accurately.
// ACM SIGPLAN Notices. 1990
#ifndef FLT_EVAL_METHOD
#error "FLT_EVAL_METHOD should be defined, please include cfloat."
#endif
#if (FLT_EVAL_METHOD != 1) && (FLT_EVAL_METHOD != 0)
// We cannot be certain that x/y is rounded to nearest.
if (0 <= power && power <= 22 && i <= 9007199254740991)
#else
if (-22 <= power && power <= 22 && i <= 9007199254740991)
#endif
{
// convert the integer into a double. This is lossless since
// 0 <= i <= 2^53 - 1.
d = double(i);
//
// The general idea is as follows.
// If 0 <= s < 2^53 and if 10^0 <= p <= 10^22 then
// 1) Both s and p can be represented exactly as 64-bit floating-point
// values
// (binary64).
// 2) Because s and p can be represented exactly as floating-point values,
// then s * p
// and s / p will produce correctly rounded values.
//
if (power < 0) {
d = d / simdjson::internal::power_of_ten[-power];
} else {
d = d * simdjson::internal::power_of_ten[power];
}
if (negative) {
d = -d;
}
return true;
}
// When 22 < power && power < 22 + 16, we could
// hope for another, secondary fast path. It was
// described by David M. Gay in "Correctly rounded
// binary-decimal and decimal-binary conversions." (1990)
// If you need to compute i * 10^(22 + x) for x < 16,
// first compute i * 10^x, if you know that result is exact
// (e.g., when i * 10^x < 2^53),
// then you can still proceed and do (i * 10^x) * 10^22.
// Is this worth your time?
// You need 22 < power *and* power < 22 + 16 *and* (i * 10^(x-22) < 2^53)
// for this second fast path to work.
// If you you have 22 < power *and* power < 22 + 16, and then you
// optimistically compute "i * 10^(x-22)", there is still a chance that you
// have wasted your time if i * 10^(x-22) >= 2^53. It makes the use cases of
// this optimization maybe less common than we would like. Source:
// http://www.exploringbinary.com/fast-path-decimal-to-floating-point-conversion/
// also used in RapidJSON: https://rapidjson.org/strtod_8h_source.html
// The fast path has now failed, so we are failing back on the slower path.
// In the slow path, we need to adjust i so that it is > 1<<63 which is always
// possible, except if i == 0, so we handle i == 0 separately.
if(i == 0) {
d = negative ? -0.0 : 0.0;
return true;
}
// The exponent is 1024 + 63 + power
// + floor(log(5**power)/log(2)).
// The 1024 comes from the ieee64 standard.
// The 63 comes from the fact that we use a 64-bit word.
//
// Computing floor(log(5**power)/log(2)) could be
// slow. Instead we use a fast function.
//
// For power in (-400,350), we have that
// (((152170 + 65536) * power ) >> 16);
// is equal to
// floor(log(5**power)/log(2)) + power when power >= 0
// and it is equal to
// ceil(log(5**-power)/log(2)) + power when power < 0
//
// The 65536 is (1<<16) and corresponds to
// (65536 * power) >> 16 ---> power
//
// ((152170 * power ) >> 16) is equal to
// floor(log(5**power)/log(2))
//
// Note that this is not magic: 152170/(1<<16) is
// approximatively equal to log(5)/log(2).
// The 1<<16 value is a power of two; we could use a
// larger power of 2 if we wanted to.
//
int64_t exponent = (((152170 + 65536) * power) >> 16) + 1024 + 63;
// We want the most significant bit of i to be 1. Shift if needed.
int lz = leading_zeroes(i);
i <<= lz;
// We are going to need to do some 64-bit arithmetic to get a precise product.
// We use a table lookup approach.
// It is safe because
// power >= smallest_power
// and power <= largest_power
// We recover the mantissa of the power, it has a leading 1. It is always
// rounded down.
//
// We want the most significant 64 bits of the product. We know
// this will be non-zero because the most significant bit of i is
// 1.
const uint32_t index = 2 * uint32_t(power - simdjson::internal::smallest_power);
// Optimization: It may be that materializing the index as a variable might confuse some compilers and prevent effective complex-addressing loads. (Done for code clarity.)
//
// The full_multiplication function computes the 128-bit product of two 64-bit words
// with a returned value of type value128 with a "low component" corresponding to the
// 64-bit least significant bits of the product and with a "high component" corresponding
// to the 64-bit most significant bits of the product.
simdjson::internal::value128 firstproduct = full_multiplication(i, simdjson::internal::power_of_five_128[index]);
// Both i and power_of_five_128[index] have their most significant bit set to 1 which
// implies that the either the most or the second most significant bit of the product
// is 1. We pack values in this manner for efficiency reasons: it maximizes the use
// we make of the product. It also makes it easy to reason about the product: there
// is 0 or 1 leading zero in the product.
// Unless the least significant 9 bits of the high (64-bit) part of the full
// product are all 1s, then we know that the most significant 55 bits are
// exact and no further work is needed. Having 55 bits is necessary because
// we need 53 bits for the mantissa but we have to have one rounding bit and
// we can waste a bit if the most significant bit of the product is zero.
if((firstproduct.high & 0x1FF) == 0x1FF) {
// We want to compute i * 5^q, but only care about the top 55 bits at most.
// Consider the scenario where q>=0. Then 5^q may not fit in 64-bits. Doing
// the full computation is wasteful. So we do what is called a "truncated
// multiplication".
// We take the most significant 64-bits, and we put them in
// power_of_five_128[index]. Usually, that's good enough to approximate i * 5^q
// to the desired approximation using one multiplication. Sometimes it does not suffice.
// Then we store the next most significant 64 bits in power_of_five_128[index + 1], and
// then we get a better approximation to i * 5^q.
//
// That's for when q>=0. The logic for q<0 is somewhat similar but it is somewhat
// more complicated.
//
// There is an extra layer of complexity in that we need more than 55 bits of
// accuracy in the round-to-even scenario.
//
// The full_multiplication function computes the 128-bit product of two 64-bit words
// with a returned value of type value128 with a "low component" corresponding to the
// 64-bit least significant bits of the product and with a "high component" corresponding
// to the 64-bit most significant bits of the product.
simdjson::internal::value128 secondproduct = full_multiplication(i, simdjson::internal::power_of_five_128[index + 1]);
firstproduct.low += secondproduct.high;
if(secondproduct.high > firstproduct.low) { firstproduct.high++; }
// As it has been proven by Noble Mushtak and Daniel Lemire in "Fast Number Parsing Without
// Fallback" (https://arxiv.org/abs/2212.06644), at this point we are sure that the product
// is sufficiently accurate, and more computation is not needed.
}
uint64_t lower = firstproduct.low;
uint64_t upper = firstproduct.high;
// The final mantissa should be 53 bits with a leading 1.
// We shift it so that it occupies 54 bits with a leading 1.
///////
uint64_t upperbit = upper >> 63;
uint64_t mantissa = upper >> (upperbit + 9);
lz += int(1 ^ upperbit);
// Here we have mantissa < (1<<54).
int64_t real_exponent = exponent - lz;
if (simdjson_unlikely(real_exponent <= 0)) { // we have a subnormal?
// Here have that real_exponent <= 0 so -real_exponent >= 0
if(-real_exponent + 1 >= 64) { // if we have more than 64 bits below the minimum exponent, you have a zero for sure.
d = negative ? -0.0 : 0.0;
return true;
}
// next line is safe because -real_exponent + 1 < 0
mantissa >>= -real_exponent + 1;
// Thankfully, we can't have both "round-to-even" and subnormals because
// "round-to-even" only occurs for powers close to 0.
mantissa += (mantissa & 1); // round up
mantissa >>= 1;
// There is a weird scenario where we don't have a subnormal but just.
// Suppose we start with 2.2250738585072013e-308, we end up
// with 0x3fffffffffffff x 2^-1023-53 which is technically subnormal
// whereas 0x40000000000000 x 2^-1023-53 is normal. Now, we need to round
// up 0x3fffffffffffff x 2^-1023-53 and once we do, we are no longer
// subnormal, but we can only know this after rounding.
// So we only declare a subnormal if we are smaller than the threshold.
real_exponent = (mantissa < (uint64_t(1) << 52)) ? 0 : 1;
d = to_double(mantissa, real_exponent, negative);
return true;
}
// We have to round to even. The "to even" part
// is only a problem when we are right in between two floats
// which we guard against.
// If we have lots of trailing zeros, we may fall right between two
// floating-point values.
//
// The round-to-even cases take the form of a number 2m+1 which is in (2^53,2^54]
// times a power of two. That is, it is right between a number with binary significand
// m and another number with binary significand m+1; and it must be the case
// that it cannot be represented by a float itself.
//
// We must have that w * 10 ^q == (2m+1) * 2^p for some power of two 2^p.
// Recall that 10^q = 5^q * 2^q.
// When q >= 0, we must have that (2m+1) is divible by 5^q, so 5^q <= 2^54. We have that
// 5^23 <= 2^54 and it is the last power of five to qualify, so q <= 23.
// When q<0, we have w >= (2m+1) x 5^{-q}. We must have that w<2^{64} so
// (2m+1) x 5^{-q} < 2^{64}. We have that 2m+1>2^{53}. Hence, we must have
// 2^{53} x 5^{-q} < 2^{64}.
// Hence we have 5^{-q} < 2^{11}$ or q>= -4.
//
// We require lower <= 1 and not lower == 0 because we could not prove that
// that lower == 0 is implied; but we could prove that lower <= 1 is a necessary and sufficient test.
if (simdjson_unlikely((lower <= 1) && (power >= -4) && (power <= 23) && ((mantissa & 3) == 1))) {
if((mantissa << (upperbit + 64 - 53 - 2)) == upper) {
mantissa &= ~1; // flip it so that we do not round up
}
}
mantissa += mantissa & 1;
mantissa >>= 1;
// Here we have mantissa < (1<<53), unless there was an overflow
if (mantissa >= (1ULL << 53)) {
//////////
// This will happen when parsing values such as 7.2057594037927933e+16
////////
mantissa = (1ULL << 52);
real_exponent++;
}
mantissa &= ~(1ULL << 52);
// we have to check that real_exponent is in range, otherwise we bail out
if (simdjson_unlikely(real_exponent > 2046)) {
// We have an infinite value!!! We could actually throw an error here if we could.
return false;
}
d = to_double(mantissa, real_exponent, negative);
return true;
}
// We call a fallback floating-point parser that might be slow. Note
// it will accept JSON numbers, but the JSON spec. is more restrictive so
// before you call parse_float_fallback, you need to have validated the input
// string with the JSON grammar.
// It will return an error (false) if the parsed number is infinite.
// The string parsing itself always succeeds. We know that there is at least
// one digit.
static bool parse_float_fallback(const uint8_t *ptr, double *outDouble) {
*outDouble = simdjson::internal::from_chars(reinterpret_cast<const char *>(ptr));
// We do not accept infinite values.
// Detecting finite values in a portable manner is ridiculously hard, ideally
// we would want to do:
// return !std::isfinite(*outDouble);
// but that mysteriously fails under legacy/old libc++ libraries, see
// https://github.com/simdjson/simdjson/issues/1286
//
// Therefore, fall back to this solution (the extra parens are there
// to handle that max may be a macro on windows).
return !(*outDouble > (std::numeric_limits<double>::max)() || *outDouble < std::numeric_limits<double>::lowest());
}
static bool parse_float_fallback(const uint8_t *ptr, const uint8_t *end_ptr, double *outDouble) {
*outDouble = simdjson::internal::from_chars(reinterpret_cast<const char *>(ptr), reinterpret_cast<const char *>(end_ptr));
// We do not accept infinite values.
// Detecting finite values in a portable manner is ridiculously hard, ideally
// we would want to do:
// return !std::isfinite(*outDouble);
// but that mysteriously fails under legacy/old libc++ libraries, see
// https://github.com/simdjson/simdjson/issues/1286
//
// Therefore, fall back to this solution (the extra parens are there
// to handle that max may be a macro on windows).
return !(*outDouble > (std::numeric_limits<double>::max)() || *outDouble < std::numeric_limits<double>::lowest());
}
// check quickly whether the next 8 chars are made of digits
// at a glance, it looks better than Mula's
// http://0x80.pl/articles/swar-digits-validate.html
simdjson_inline bool is_made_of_eight_digits_fast(const uint8_t *chars) {
uint64_t val;
// this can read up to 7 bytes beyond the buffer size, but we require
// SIMDJSON_PADDING of padding
static_assert(7 <= SIMDJSON_PADDING, "SIMDJSON_PADDING must be bigger than 7");
std::memcpy(&val, chars, 8);
// a branchy method might be faster:
// return (( val & 0xF0F0F0F0F0F0F0F0 ) == 0x3030303030303030)
// && (( (val + 0x0606060606060606) & 0xF0F0F0F0F0F0F0F0 ) ==
// 0x3030303030303030);
return (((val & 0xF0F0F0F0F0F0F0F0) |
(((val + 0x0606060606060606) & 0xF0F0F0F0F0F0F0F0) >> 4)) ==
0x3333333333333333);
}
template<typename I>
SIMDJSON_NO_SANITIZE_UNDEFINED // We deliberately allow overflow here and check later
simdjson_inline bool parse_digit(const uint8_t c, I &i) {
const uint8_t digit = static_cast<uint8_t>(c - '0');
if (digit > 9) {
return false;
}
// PERF NOTE: multiplication by 10 is cheaper than arbitrary integer multiplication
i = 10 * i + digit; // might overflow, we will handle the overflow later
return true;
}
simdjson_inline bool is_digit(const uint8_t c) {
return static_cast<uint8_t>(c - '0') <= 9;
}
simdjson_inline error_code parse_decimal_after_separator(simdjson_unused const uint8_t *const src, const uint8_t *&p, uint64_t &i, int64_t &exponent) {
// we continue with the fiction that we have an integer. If the
// floating point number is representable as x * 10^z for some integer
// z that fits in 53 bits, then we will be able to convert back the
// the integer into a float in a lossless manner.
const uint8_t *const first_after_period = p;
#ifdef SIMDJSON_SWAR_NUMBER_PARSING
#if SIMDJSON_SWAR_NUMBER_PARSING
// this helps if we have lots of decimals!
// this turns out to be frequent enough.
if (is_made_of_eight_digits_fast(p)) {
i = i * 100000000 + parse_eight_digits_unrolled(p);
p += 8;
}
#endif // SIMDJSON_SWAR_NUMBER_PARSING
#endif // #ifdef SIMDJSON_SWAR_NUMBER_PARSING
// Unrolling the first digit makes a small difference on some implementations (e.g. westmere)
if (parse_digit(*p, i)) { ++p; }
while (parse_digit(*p, i)) { p++; }
exponent = first_after_period - p;
// Decimal without digits (123.) is illegal
if (exponent == 0) {
return INVALID_NUMBER(src);
}
return SUCCESS;
}
simdjson_inline error_code parse_exponent(simdjson_unused const uint8_t *const src, const uint8_t *&p, int64_t &exponent) {
// Exp Sign: -123.456e[-]78
bool neg_exp = ('-' == *p);
if (neg_exp || '+' == *p) { p++; } // Skip + as well
// Exponent: -123.456e-[78]
auto start_exp = p;
int64_t exp_number = 0;
while (parse_digit(*p, exp_number)) { ++p; }
// It is possible for parse_digit to overflow.
// In particular, it could overflow to INT64_MIN, and we cannot do - INT64_MIN.
// Thus we *must* check for possible overflow before we negate exp_number.
// Performance notes: it may seem like combining the two "simdjson_unlikely checks" below into
// a single simdjson_unlikely path would be faster. The reasoning is sound, but the compiler may
// not oblige and may, in fact, generate two distinct paths in any case. It might be
// possible to do uint64_t(p - start_exp - 1) >= 18 but it could end up trading off
// instructions for a simdjson_likely branch, an unconclusive gain.
// If there were no digits, it's an error.
if (simdjson_unlikely(p == start_exp)) {
return INVALID_NUMBER(src);
}
// We have a valid positive exponent in exp_number at this point, except that
// it may have overflowed.
// If there were more than 18 digits, we may have overflowed the integer. We have to do
// something!!!!
if (simdjson_unlikely(p > start_exp+18)) {
// Skip leading zeroes: 1e000000000000000000001 is technically valid and does not overflow
while (*start_exp == '0') { start_exp++; }
// 19 digits could overflow int64_t and is kind of absurd anyway. We don't
// support exponents smaller than -999,999,999,999,999,999 and bigger
// than 999,999,999,999,999,999.
// We can truncate.
// Note that 999999999999999999 is assuredly too large. The maximal ieee64 value before
// infinity is ~1.8e308. The smallest subnormal is ~5e-324. So, actually, we could
// truncate at 324.
// Note that there is no reason to fail per se at this point in time.
// E.g., 0e999999999999999999999 is a fine number.
if (p > start_exp+18) { exp_number = 999999999999999999; }
}
// At this point, we know that exp_number is a sane, positive, signed integer.
// It is <= 999,999,999,999,999,999. As long as 'exponent' is in
// [-8223372036854775808, 8223372036854775808], we won't overflow. Because 'exponent'
// is bounded in magnitude by the size of the JSON input, we are fine in this universe.
// To sum it up: the next line should never overflow.
exponent += (neg_exp ? -exp_number : exp_number);
return SUCCESS;
}
simdjson_inline bool check_if_integer(const uint8_t *const src, size_t max_length) {
const uint8_t *const srcend = src + max_length;
bool negative = (*src == '-'); // we can always read at least one character after the '-'
const uint8_t *p = src + uint8_t(negative);
if(p == srcend) { return false; }
if(*p == '0') {
++p;
if(p == srcend) { return true; }
if(jsoncharutils::is_not_structural_or_whitespace(*p)) { return false; }
return true;
}
while(p != srcend && is_digit(*p)) { ++p; }
if(p == srcend) { return true; }
if(jsoncharutils::is_not_structural_or_whitespace(*p)) { return false; }
return true;
}
simdjson_inline size_t significant_digits(const uint8_t * start_digits, size_t digit_count) {
// It is possible that the integer had an overflow.
// We have to handle the case where we have 0.0000somenumber.
const uint8_t *start = start_digits;
while ((*start == '0') || (*start == '.')) { ++start; }
// we over-decrement by one when there is a '.'
return digit_count - size_t(start - start_digits);
}
} // unnamed namespace
/** @private */
static error_code slow_float_parsing(simdjson_unused const uint8_t * src, double* answer) {
if (parse_float_fallback(src, answer)) {
return SUCCESS;
}
return INVALID_NUMBER(src);
}
/** @private */
template<typename W>
simdjson_inline error_code write_float(const uint8_t *const src, bool negative, uint64_t i, const uint8_t * start_digits, size_t digit_count, int64_t exponent, W &writer) {
// If we frequently had to deal with long strings of digits,
// we could extend our code by using a 128-bit integer instead
// of a 64-bit integer. However, this is uncommon in practice.
//
// 9999999999999999999 < 2**64 so we can accommodate 19 digits.
// If we have a decimal separator, then digit_count - 1 is the number of digits, but we
// may not have a decimal separator!
if (simdjson_unlikely(digit_count > 19 && significant_digits(start_digits, digit_count) > 19)) {
// Ok, chances are good that we had an overflow!
// this is almost never going to get called!!!
// we start anew, going slowly!!!
// This will happen in the following examples:
// 10000000000000000000000000000000000000000000e+308
// 3.1415926535897932384626433832795028841971693993751
//
// NOTE: We do not pass a reference to the to slow_float_parsing. If we passed our writer
// reference to it, it would force it to be stored in memory, preventing the compiler from
// picking it apart and putting into registers. i.e. if we pass it as reference,
// it gets slow.
double d;
error_code error = slow_float_parsing(src, &d);
writer.append_double(d);
return error;
}
// NOTE: it's weird that the simdjson_unlikely() only wraps half the if, but it seems to get slower any other
// way we've tried: https://github.com/simdjson/simdjson/pull/990#discussion_r448497331
// To future reader: we'd love if someone found a better way, or at least could explain this result!
if (simdjson_unlikely(exponent < simdjson::internal::smallest_power) || (exponent > simdjson::internal::largest_power)) {
//
// Important: smallest_power is such that it leads to a zero value.
// Observe that 18446744073709551615e-343 == 0, i.e. (2**64 - 1) e -343 is zero
// so something x 10^-343 goes to zero, but not so with something x 10^-342.
static_assert(simdjson::internal::smallest_power <= -342, "smallest_power is not small enough");
//
if((exponent < simdjson::internal::smallest_power) || (i == 0)) {
// E.g. Parse "-0.0e-999" into the same value as "-0.0". See https://en.wikipedia.org/wiki/Signed_zero
WRITE_DOUBLE(negative ? -0.0 : 0.0, src, writer);
return SUCCESS;
} else { // (exponent > largest_power) and (i != 0)
// We have, for sure, an infinite value and simdjson refuses to parse infinite values.
return INVALID_NUMBER(src);
}
}
double d;
if (!compute_float_64(exponent, i, negative, d)) {
// we are almost never going to get here.
if (!parse_float_fallback(src, &d)) { return INVALID_NUMBER(src); }
}
WRITE_DOUBLE(d, src, writer);
return SUCCESS;
}
// parse the number at src
// define JSON_TEST_NUMBERS for unit testing
//
// It is assumed that the number is followed by a structural ({,},],[) character
// or a white space character. If that is not the case (e.g., when the JSON
// document is made of a single number), then it is necessary to copy the
// content and append a space before calling this function.
//
// Our objective is accurate parsing (ULP of 0) at high speed.
template<typename W>
simdjson_inline error_code parse_number(const uint8_t *const src, W &writer);
// for performance analysis, it is sometimes useful to skip parsing
#ifdef SIMDJSON_SKIPNUMBERPARSING
template<typename W>
simdjson_inline error_code parse_number(const uint8_t *const, W &writer) {
writer.append_s64(0); // always write zero
return SUCCESS; // always succeeds
}
simdjson_unused simdjson_inline simdjson_result<uint64_t> parse_unsigned(const uint8_t * const src) noexcept { return 0; }
simdjson_unused simdjson_inline simdjson_result<int64_t> parse_integer(const uint8_t * const src) noexcept { return 0; }
simdjson_unused simdjson_inline simdjson_result<double> parse_double(const uint8_t * const src) noexcept { return 0; }
simdjson_unused simdjson_inline simdjson_result<uint64_t> parse_unsigned_in_string(const uint8_t * const src) noexcept { return 0; }
simdjson_unused simdjson_inline simdjson_result<int64_t> parse_integer_in_string(const uint8_t * const src) noexcept { return 0; }
simdjson_unused simdjson_inline simdjson_result<double> parse_double_in_string(const uint8_t * const src) noexcept { return 0; }
simdjson_unused simdjson_inline bool is_negative(const uint8_t * src) noexcept { return false; }
simdjson_unused simdjson_inline simdjson_result<bool> is_integer(const uint8_t * src) noexcept { return false; }
simdjson_unused simdjson_inline simdjson_result<number_type> get_number_type(const uint8_t * src) noexcept { return number_type::signed_integer; }
#else
// parse the number at src
// define JSON_TEST_NUMBERS for unit testing
//
// It is assumed that the number is followed by a structural ({,},],[) character
// or a white space character. If that is not the case (e.g., when the JSON
// document is made of a single number), then it is necessary to copy the
// content and append a space before calling this function.
//
// Our objective is accurate parsing (ULP of 0) at high speed.
template<typename W>
simdjson_inline error_code parse_number(const uint8_t *const src, W &writer) {
//
// Check for minus sign
//
bool negative = (*src == '-');
const uint8_t *p = src + uint8_t(negative);
//
// Parse the integer part.
//
// PERF NOTE: we don't use is_made_of_eight_digits_fast because large integers like 123456789 are rare
const uint8_t *const start_digits = p;
uint64_t i = 0;
while (parse_digit(*p, i)) { p++; }
// If there were no digits, or if the integer starts with 0 and has more than one digit, it's an error.
// Optimization note: size_t is expected to be unsigned.
size_t digit_count = size_t(p - start_digits);
if (digit_count == 0 || ('0' == *start_digits && digit_count > 1)) { return INVALID_NUMBER(src); }
//
// Handle floats if there is a . or e (or both)
//
int64_t exponent = 0;
bool is_float = false;
if ('.' == *p) {
is_float = true;
++p;
SIMDJSON_TRY( parse_decimal_after_separator(src, p, i, exponent) );
digit_count = int(p - start_digits); // used later to guard against overflows
}
if (('e' == *p) || ('E' == *p)) {
is_float = true;
++p;
SIMDJSON_TRY( parse_exponent(src, p, exponent) );
}
if (is_float) {
const bool dirty_end = jsoncharutils::is_not_structural_or_whitespace(*p);
SIMDJSON_TRY( write_float(src, negative, i, start_digits, digit_count, exponent, writer) );
if (dirty_end) { return INVALID_NUMBER(src); }
return SUCCESS;
}
// The longest negative 64-bit number is 19 digits.
// The longest positive 64-bit number is 20 digits.
// We do it this way so we don't trigger this branch unless we must.
size_t longest_digit_count = negative ? 19 : 20;
if (digit_count > longest_digit_count) { return BIGINT_NUMBER(src); }
if (digit_count == longest_digit_count) {
if (negative) {
// Anything negative above INT64_MAX+1 is invalid
if (i > uint64_t(INT64_MAX)+1) { return BIGINT_NUMBER(src); }
WRITE_INTEGER(~i+1, src, writer);
if (jsoncharutils::is_not_structural_or_whitespace(*p)) { return INVALID_NUMBER(src); }
return SUCCESS;
// Positive overflow check:
// - A 20 digit number starting with 2-9 is overflow, because 18,446,744,073,709,551,615 is the
// biggest uint64_t.
// - A 20 digit number starting with 1 is overflow if it is less than INT64_MAX.
// If we got here, it's a 20 digit number starting with the digit "1".
// - If a 20 digit number starting with 1 overflowed (i*10+digit), the result will be smaller
// than 1,553,255,926,290,448,384.
// - That is smaller than the smallest possible 20-digit number the user could write:
// 10,000,000,000,000,000,000.
// - Therefore, if the number is positive and lower than that, it's overflow.
// - The value we are looking at is less than or equal to INT64_MAX.
//
} else if (src[0] != uint8_t('1') || i <= uint64_t(INT64_MAX)) { return INVALID_NUMBER(src); }
}
// Write unsigned if it does not fit in a signed integer.
if (i > uint64_t(INT64_MAX)) {
WRITE_UNSIGNED(i, src, writer);
} else {
WRITE_INTEGER(negative ? (~i+1) : i, src, writer);
}
if (jsoncharutils::is_not_structural_or_whitespace(*p)) { return INVALID_NUMBER(src); }
return SUCCESS;
}
// Inlineable functions
namespace {
// This table can be used to characterize the final character of an integer
// string. For JSON structural character and allowable white space characters,
// we return SUCCESS. For 'e', '.' and 'E', we return INCORRECT_TYPE. Otherwise
// we return NUMBER_ERROR.
// Optimization note: we could easily reduce the size of the table by half (to 128)
// at the cost of an extra branch.
// Optimization note: we want the values to use at most 8 bits (not, e.g., 32 bits):
static_assert(error_code(uint8_t(NUMBER_ERROR))== NUMBER_ERROR, "bad NUMBER_ERROR cast");
static_assert(error_code(uint8_t(SUCCESS))== SUCCESS, "bad NUMBER_ERROR cast");
static_assert(error_code(uint8_t(INCORRECT_TYPE))== INCORRECT_TYPE, "bad NUMBER_ERROR cast");
const uint8_t integer_string_finisher[256] = {
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, SUCCESS,
SUCCESS, NUMBER_ERROR, NUMBER_ERROR, SUCCESS, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, SUCCESS, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, SUCCESS,
NUMBER_ERROR, INCORRECT_TYPE, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, SUCCESS, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, INCORRECT_TYPE,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, SUCCESS, NUMBER_ERROR, SUCCESS, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, INCORRECT_TYPE, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, SUCCESS, NUMBER_ERROR,
SUCCESS, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR};
// Parse any number from 0 to 18,446,744,073,709,551,615
simdjson_unused simdjson_inline simdjson_result<uint64_t> parse_unsigned(const uint8_t * const src) noexcept {
const uint8_t *p = src;
//
// Parse the integer part.
//
// PERF NOTE: we don't use is_made_of_eight_digits_fast because large integers like 123456789 are rare
const uint8_t *const start_digits = p;
uint64_t i = 0;
while (parse_digit(*p, i)) { p++; }
// If there were no digits, or if the integer starts with 0 and has more than one digit, it's an error.
// Optimization note: size_t is expected to be unsigned.
size_t digit_count = size_t(p - start_digits);
// The longest positive 64-bit number is 20 digits.
// We do it this way so we don't trigger this branch unless we must.
// Optimization note: the compiler can probably merge
// ((digit_count == 0) || (digit_count > 20))
// into a single branch since digit_count is unsigned.
if ((digit_count == 0) || (digit_count > 20)) { return INCORRECT_TYPE; }
// Here digit_count > 0.
if (('0' == *start_digits) && (digit_count > 1)) { return NUMBER_ERROR; }
// We can do the following...
// if (!jsoncharutils::is_structural_or_whitespace(*p)) {
// return (*p == '.' || *p == 'e' || *p == 'E') ? INCORRECT_TYPE : NUMBER_ERROR;
// }
// as a single table lookup:
if (integer_string_finisher[*p] != SUCCESS) { return error_code(integer_string_finisher[*p]); }
if (digit_count == 20) {
// Positive overflow check:
// - A 20 digit number starting with 2-9 is overflow, because 18,446,744,073,709,551,615 is the
// biggest uint64_t.
// - A 20 digit number starting with 1 is overflow if it is less than INT64_MAX.
// If we got here, it's a 20 digit number starting with the digit "1".
// - If a 20 digit number starting with 1 overflowed (i*10+digit), the result will be smaller
// than 1,553,255,926,290,448,384.
// - That is smaller than the smallest possible 20-digit number the user could write:
// 10,000,000,000,000,000,000.
// - Therefore, if the number is positive and lower than that, it's overflow.
// - The value we are looking at is less than or equal to INT64_MAX.
//
if (src[0] != uint8_t('1') || i <= uint64_t(INT64_MAX)) { return INCORRECT_TYPE; }
}
return i;
}
// Parse any number from 0 to 18,446,744,073,709,551,615
// Never read at src_end or beyond
simdjson_unused simdjson_inline simdjson_result<uint64_t> parse_unsigned(const uint8_t * const src, const uint8_t * const src_end) noexcept {
const uint8_t *p = src;
//
// Parse the integer part.
//
// PERF NOTE: we don't use is_made_of_eight_digits_fast because large integers like 123456789 are rare
const uint8_t *const start_digits = p;
uint64_t i = 0;
while ((p != src_end) && parse_digit(*p, i)) { p++; }
// If there were no digits, or if the integer starts with 0 and has more than one digit, it's an error.
// Optimization note: size_t is expected to be unsigned.
size_t digit_count = size_t(p - start_digits);
// The longest positive 64-bit number is 20 digits.
// We do it this way so we don't trigger this branch unless we must.
// Optimization note: the compiler can probably merge
// ((digit_count == 0) || (digit_count > 20))
// into a single branch since digit_count is unsigned.
if ((digit_count == 0) || (digit_count > 20)) { return INCORRECT_TYPE; }
// Here digit_count > 0.
if (('0' == *start_digits) && (digit_count > 1)) { return NUMBER_ERROR; }
// We can do the following...
// if (!jsoncharutils::is_structural_or_whitespace(*p)) {
// return (*p == '.' || *p == 'e' || *p == 'E') ? INCORRECT_TYPE : NUMBER_ERROR;
// }
// as a single table lookup:
if ((p != src_end) && integer_string_finisher[*p] != SUCCESS) { return error_code(integer_string_finisher[*p]); }
if (digit_count == 20) {
// Positive overflow check:
// - A 20 digit number starting with 2-9 is overflow, because 18,446,744,073,709,551,615 is the
// biggest uint64_t.
// - A 20 digit number starting with 1 is overflow if it is less than INT64_MAX.
// If we got here, it's a 20 digit number starting with the digit "1".
// - If a 20 digit number starting with 1 overflowed (i*10+digit), the result will be smaller
// than 1,553,255,926,290,448,384.
// - That is smaller than the smallest possible 20-digit number the user could write:
// 10,000,000,000,000,000,000.
// - Therefore, if the number is positive and lower than that, it's overflow.
// - The value we are looking at is less than or equal to INT64_MAX.
//
if (src[0] != uint8_t('1') || i <= uint64_t(INT64_MAX)) { return INCORRECT_TYPE; }
}
return i;
}
// Parse any number from 0 to 18,446,744,073,709,551,615
simdjson_unused simdjson_inline simdjson_result<uint64_t> parse_unsigned_in_string(const uint8_t * const src) noexcept {
const uint8_t *p = src + 1;
//
// Parse the integer part.
//
// PERF NOTE: we don't use is_made_of_eight_digits_fast because large integers like 123456789 are rare
const uint8_t *const start_digits = p;
uint64_t i = 0;
while (parse_digit(*p, i)) { p++; }
// If there were no digits, or if the integer starts with 0 and has more than one digit, it's an error.
// Optimization note: size_t is expected to be unsigned.
size_t digit_count = size_t(p - start_digits);
// The longest positive 64-bit number is 20 digits.
// We do it this way so we don't trigger this branch unless we must.
// Optimization note: the compiler can probably merge
// ((digit_count == 0) || (digit_count > 20))
// into a single branch since digit_count is unsigned.
if ((digit_count == 0) || (digit_count > 20)) { return INCORRECT_TYPE; }
// Here digit_count > 0.
if (('0' == *start_digits) && (digit_count > 1)) { return NUMBER_ERROR; }
// We can do the following...
// if (!jsoncharutils::is_structural_or_whitespace(*p)) {
// return (*p == '.' || *p == 'e' || *p == 'E') ? INCORRECT_TYPE : NUMBER_ERROR;
// }
// as a single table lookup:
if (*p != '"') { return NUMBER_ERROR; }
if (digit_count == 20) {
// Positive overflow check:
// - A 20 digit number starting with 2-9 is overflow, because 18,446,744,073,709,551,615 is the
// biggest uint64_t.
// - A 20 digit number starting with 1 is overflow if it is less than INT64_MAX.
// If we got here, it's a 20 digit number starting with the digit "1".
// - If a 20 digit number starting with 1 overflowed (i*10+digit), the result will be smaller
// than 1,553,255,926,290,448,384.
// - That is smaller than the smallest possible 20-digit number the user could write:
// 10,000,000,000,000,000,000.
// - Therefore, if the number is positive and lower than that, it's overflow.
// - The value we are looking at is less than or equal to INT64_MAX.
//
// Note: we use src[1] and not src[0] because src[0] is the quote character in this
// instance.
if (src[1] != uint8_t('1') || i <= uint64_t(INT64_MAX)) { return INCORRECT_TYPE; }
}
return i;
}
// Parse any number from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
simdjson_unused simdjson_inline simdjson_result<int64_t> parse_integer(const uint8_t *src) noexcept {
//
// Check for minus sign
//
bool negative = (*src == '-');
const uint8_t *p = src + uint8_t(negative);
//
// Parse the integer part.
//
// PERF NOTE: we don't use is_made_of_eight_digits_fast because large integers like 123456789 are rare
const uint8_t *const start_digits = p;
uint64_t i = 0;
while (parse_digit(*p, i)) { p++; }
// If there were no digits, or if the integer starts with 0 and has more than one digit, it's an error.
// Optimization note: size_t is expected to be unsigned.
size_t digit_count = size_t(p - start_digits);
// We go from
// -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
// so we can never represent numbers that have more than 19 digits.
size_t longest_digit_count = 19;
// Optimization note: the compiler can probably merge
// ((digit_count == 0) || (digit_count > longest_digit_count))
// into a single branch since digit_count is unsigned.
if ((digit_count == 0) || (digit_count > longest_digit_count)) { return INCORRECT_TYPE; }
// Here digit_count > 0.
if (('0' == *start_digits) && (digit_count > 1)) { return NUMBER_ERROR; }
// We can do the following...
// if (!jsoncharutils::is_structural_or_whitespace(*p)) {
// return (*p == '.' || *p == 'e' || *p == 'E') ? INCORRECT_TYPE : NUMBER_ERROR;
// }
// as a single table lookup:
if(integer_string_finisher[*p] != SUCCESS) { return error_code(integer_string_finisher[*p]); }
// Negative numbers have can go down to - INT64_MAX - 1 whereas positive numbers are limited to INT64_MAX.
// Performance note: This check is only needed when digit_count == longest_digit_count but it is
// so cheap that we might as well always make it.
if(i > uint64_t(INT64_MAX) + uint64_t(negative)) { return INCORRECT_TYPE; }
return negative ? (~i+1) : i;
}
// Parse any number from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
// Never read at src_end or beyond
simdjson_unused simdjson_inline simdjson_result<int64_t> parse_integer(const uint8_t * const src, const uint8_t * const src_end) noexcept {
//
// Check for minus sign
//
if(src == src_end) { return NUMBER_ERROR; }
bool negative = (*src == '-');
const uint8_t *p = src + uint8_t(negative);
//
// Parse the integer part.
//
// PERF NOTE: we don't use is_made_of_eight_digits_fast because large integers like 123456789 are rare
const uint8_t *const start_digits = p;
uint64_t i = 0;
while ((p != src_end) && parse_digit(*p, i)) { p++; }
// If there were no digits, or if the integer starts with 0 and has more than one digit, it's an error.
// Optimization note: size_t is expected to be unsigned.
size_t digit_count = size_t(p - start_digits);
// We go from
// -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
// so we can never represent numbers that have more than 19 digits.
size_t longest_digit_count = 19;
// Optimization note: the compiler can probably merge
// ((digit_count == 0) || (digit_count > longest_digit_count))
// into a single branch since digit_count is unsigned.
if ((digit_count == 0) || (digit_count > longest_digit_count)) { return INCORRECT_TYPE; }
// Here digit_count > 0.
if (('0' == *start_digits) && (digit_count > 1)) { return NUMBER_ERROR; }
// We can do the following...
// if (!jsoncharutils::is_structural_or_whitespace(*p)) {
// return (*p == '.' || *p == 'e' || *p == 'E') ? INCORRECT_TYPE : NUMBER_ERROR;
// }
// as a single table lookup:
if((p != src_end) && integer_string_finisher[*p] != SUCCESS) { return error_code(integer_string_finisher[*p]); }
// Negative numbers have can go down to - INT64_MAX - 1 whereas positive numbers are limited to INT64_MAX.
// Performance note: This check is only needed when digit_count == longest_digit_count but it is
// so cheap that we might as well always make it.
if(i > uint64_t(INT64_MAX) + uint64_t(negative)) { return INCORRECT_TYPE; }
return negative ? (~i+1) : i;
}
// Parse any number from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
simdjson_unused simdjson_inline simdjson_result<int64_t> parse_integer_in_string(const uint8_t *src) noexcept {
//
// Check for minus sign
//
bool negative = (*(src + 1) == '-');
src += uint8_t(negative) + 1;
//
// Parse the integer part.
//
// PERF NOTE: we don't use is_made_of_eight_digits_fast because large integers like 123456789 are rare
const uint8_t *const start_digits = src;
uint64_t i = 0;
while (parse_digit(*src, i)) { src++; }
// If there were no digits, or if the integer starts with 0 and has more than one digit, it's an error.
// Optimization note: size_t is expected to be unsigned.
size_t digit_count = size_t(src - start_digits);
// We go from
// -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
// so we can never represent numbers that have more than 19 digits.
size_t longest_digit_count = 19;
// Optimization note: the compiler can probably merge
// ((digit_count == 0) || (digit_count > longest_digit_count))
// into a single branch since digit_count is unsigned.
if ((digit_count == 0) || (digit_count > longest_digit_count)) { return INCORRECT_TYPE; }
// Here digit_count > 0.
if (('0' == *start_digits) && (digit_count > 1)) { return NUMBER_ERROR; }
// We can do the following...
// if (!jsoncharutils::is_structural_or_whitespace(*src)) {
// return (*src == '.' || *src == 'e' || *src == 'E') ? INCORRECT_TYPE : NUMBER_ERROR;
// }
// as a single table lookup:
if(*src != '"') { return NUMBER_ERROR; }
// Negative numbers have can go down to - INT64_MAX - 1 whereas positive numbers are limited to INT64_MAX.
// Performance note: This check is only needed when digit_count == longest_digit_count but it is
// so cheap that we might as well always make it.
if(i > uint64_t(INT64_MAX) + uint64_t(negative)) { return INCORRECT_TYPE; }
return negative ? (~i+1) : i;
}
simdjson_unused simdjson_inline simdjson_result<double> parse_double(const uint8_t * src) noexcept {
//
// Check for minus sign
//
bool negative = (*src == '-');
src += uint8_t(negative);
//
// Parse the integer part.
//
uint64_t i = 0;
const uint8_t *p = src;
p += parse_digit(*p, i);
bool leading_zero = (i == 0);
while (parse_digit(*p, i)) { p++; }
// no integer digits, or 0123 (zero must be solo)
if ( p == src ) { return INCORRECT_TYPE; }
if ( (leading_zero && p != src+1)) { return NUMBER_ERROR; }
//
// Parse the decimal part.
//
int64_t exponent = 0;
bool overflow;
if (simdjson_likely(*p == '.')) {
p++;
const uint8_t *start_decimal_digits = p;
if (!parse_digit(*p, i)) { return NUMBER_ERROR; } // no decimal digits
p++;
while (parse_digit(*p, i)) { p++; }
exponent = -(p - start_decimal_digits);
// Overflow check. More than 19 digits (minus the decimal) may be overflow.
overflow = p-src-1 > 19;
if (simdjson_unlikely(overflow && leading_zero)) {
// Skip leading 0.00000 and see if it still overflows
const uint8_t *start_digits = src + 2;
while (*start_digits == '0') { start_digits++; }
overflow = p-start_digits > 19;
}
} else {
overflow = p-src > 19;
}
//
// Parse the exponent
//
if (*p == 'e' || *p == 'E') {
p++;
bool exp_neg = *p == '-';
p += exp_neg || *p == '+';
uint64_t exp = 0;
const uint8_t *start_exp_digits = p;
while (parse_digit(*p, exp)) { p++; }
// no exp digits, or 20+ exp digits
if (p-start_exp_digits == 0 || p-start_exp_digits > 19) { return NUMBER_ERROR; }
exponent += exp_neg ? 0-exp : exp;
}
if (jsoncharutils::is_not_structural_or_whitespace(*p)) { return NUMBER_ERROR; }
overflow = overflow || exponent < simdjson::internal::smallest_power || exponent > simdjson::internal::largest_power;
//
// Assemble (or slow-parse) the float
//
double d;
if (simdjson_likely(!overflow)) {
if (compute_float_64(exponent, i, negative, d)) { return d; }
}
if (!parse_float_fallback(src - uint8_t(negative), &d)) {
return NUMBER_ERROR;
}
return d;
}
simdjson_unused simdjson_inline bool is_negative(const uint8_t * src) noexcept {
return (*src == '-');
}
simdjson_unused simdjson_inline simdjson_result<bool> is_integer(const uint8_t * src) noexcept {
bool negative = (*src == '-');
src += uint8_t(negative);
const uint8_t *p = src;
while(static_cast<uint8_t>(*p - '0') <= 9) { p++; }
if ( p == src ) { return NUMBER_ERROR; }
if (jsoncharutils::is_structural_or_whitespace(*p)) { return true; }
return false;
}
simdjson_unused simdjson_inline simdjson_result<number_type> get_number_type(const uint8_t * src) noexcept {
bool negative = (*src == '-');
src += uint8_t(negative);
const uint8_t *p = src;
while(static_cast<uint8_t>(*p - '0') <= 9) { p++; }
size_t digit_count = size_t(p - src);
if ( p == src ) { return NUMBER_ERROR; }
if (jsoncharutils::is_structural_or_whitespace(*p)) {
static const uint8_t * smaller_big_integer = reinterpret_cast<const uint8_t *>("9223372036854775808");
// We have an integer.
if(simdjson_unlikely(digit_count > 20)) {
return number_type::big_integer;
}
// If the number is negative and valid, it must be a signed integer.
if(negative) {
if (simdjson_unlikely(digit_count > 19)) return number_type::big_integer;
if (simdjson_unlikely(digit_count == 19 && memcmp(src, smaller_big_integer, 19) > 0)) {
return number_type::big_integer;
}
return number_type::signed_integer;
}
// Let us check if we have a big integer (>=2**64).
static const uint8_t * two_to_sixtyfour = reinterpret_cast<const uint8_t *>("18446744073709551616");
if((digit_count > 20) || (digit_count == 20 && memcmp(src, two_to_sixtyfour, 20) >= 0)) {
return number_type::big_integer;
}
// The number is positive and smaller than 18446744073709551616 (or 2**64).
// We want values larger or equal to 9223372036854775808 to be unsigned
// integers, and the other values to be signed integers.
if((digit_count == 20) || (digit_count >= 19 && memcmp(src, smaller_big_integer, 19) >= 0)) {
return number_type::unsigned_integer;
}
return number_type::signed_integer;
}
// Hopefully, we have 'e' or 'E' or '.'.
return number_type::floating_point_number;
}
// Never read at src_end or beyond
simdjson_unused simdjson_inline simdjson_result<double> parse_double(const uint8_t * src, const uint8_t * const src_end) noexcept {
if(src == src_end) { return NUMBER_ERROR; }
//
// Check for minus sign
//
bool negative = (*src == '-');
src += uint8_t(negative);
//
// Parse the integer part.
//
uint64_t i = 0;
const uint8_t *p = src;
if(p == src_end) { return NUMBER_ERROR; }
p += parse_digit(*p, i);
bool leading_zero = (i == 0);
while ((p != src_end) && parse_digit(*p, i)) { p++; }
// no integer digits, or 0123 (zero must be solo)
if ( p == src ) { return INCORRECT_TYPE; }
if ( (leading_zero && p != src+1)) { return NUMBER_ERROR; }
//
// Parse the decimal part.
//
int64_t exponent = 0;
bool overflow;
if (simdjson_likely((p != src_end) && (*p == '.'))) {
p++;
const uint8_t *start_decimal_digits = p;
if ((p == src_end) || !parse_digit(*p, i)) { return NUMBER_ERROR; } // no decimal digits
p++;
while ((p != src_end) && parse_digit(*p, i)) { p++; }
exponent = -(p - start_decimal_digits);
// Overflow check. More than 19 digits (minus the decimal) may be overflow.
overflow = p-src-1 > 19;
if (simdjson_unlikely(overflow && leading_zero)) {
// Skip leading 0.00000 and see if it still overflows
const uint8_t *start_digits = src + 2;
while (*start_digits == '0') { start_digits++; }
overflow = start_digits-src > 19;
}
} else {
overflow = p-src > 19;
}
//
// Parse the exponent
//
if ((p != src_end) && (*p == 'e' || *p == 'E')) {
p++;
if(p == src_end) { return NUMBER_ERROR; }
bool exp_neg = *p == '-';
p += exp_neg || *p == '+';
uint64_t exp = 0;
const uint8_t *start_exp_digits = p;
while ((p != src_end) && parse_digit(*p, exp)) { p++; }
// no exp digits, or 20+ exp digits
if (p-start_exp_digits == 0 || p-start_exp_digits > 19) { return NUMBER_ERROR; }
exponent += exp_neg ? 0-exp : exp;
}
if ((p != src_end) && jsoncharutils::is_not_structural_or_whitespace(*p)) { return NUMBER_ERROR; }
overflow = overflow || exponent < simdjson::internal::smallest_power || exponent > simdjson::internal::largest_power;
//
// Assemble (or slow-parse) the float
//
double d;
if (simdjson_likely(!overflow)) {
if (compute_float_64(exponent, i, negative, d)) { return d; }
}
if (!parse_float_fallback(src - uint8_t(negative), src_end, &d)) {
return NUMBER_ERROR;
}
return d;
}
simdjson_unused simdjson_inline simdjson_result<double> parse_double_in_string(const uint8_t * src) noexcept {
//
// Check for minus sign
//
bool negative = (*(src + 1) == '-');
src += uint8_t(negative) + 1;
//
// Parse the integer part.
//
uint64_t i = 0;
const uint8_t *p = src;
p += parse_digit(*p, i);
bool leading_zero = (i == 0);
while (parse_digit(*p, i)) { p++; }
// no integer digits, or 0123 (zero must be solo)
if ( p == src ) { return INCORRECT_TYPE; }
if ( (leading_zero && p != src+1)) { return NUMBER_ERROR; }
//
// Parse the decimal part.
//
int64_t exponent = 0;
bool overflow;
if (simdjson_likely(*p == '.')) {
p++;
const uint8_t *start_decimal_digits = p;
if (!parse_digit(*p, i)) { return NUMBER_ERROR; } // no decimal digits
p++;
while (parse_digit(*p, i)) { p++; }
exponent = -(p - start_decimal_digits);
// Overflow check. More than 19 digits (minus the decimal) may be overflow.
overflow = p-src-1 > 19;
if (simdjson_unlikely(overflow && leading_zero)) {
// Skip leading 0.00000 and see if it still overflows
const uint8_t *start_digits = src + 2;
while (*start_digits == '0') { start_digits++; }
overflow = p-start_digits > 19;
}
} else {
overflow = p-src > 19;
}
//
// Parse the exponent
//
if (*p == 'e' || *p == 'E') {
p++;
bool exp_neg = *p == '-';
p += exp_neg || *p == '+';
uint64_t exp = 0;
const uint8_t *start_exp_digits = p;
while (parse_digit(*p, exp)) { p++; }
// no exp digits, or 20+ exp digits
if (p-start_exp_digits == 0 || p-start_exp_digits > 19) { return NUMBER_ERROR; }
exponent += exp_neg ? 0-exp : exp;
}
if (*p != '"') { return NUMBER_ERROR; }
overflow = overflow || exponent < simdjson::internal::smallest_power || exponent > simdjson::internal::largest_power;
//
// Assemble (or slow-parse) the float
//
double d;
if (simdjson_likely(!overflow)) {
if (compute_float_64(exponent, i, negative, d)) { return d; }
}
if (!parse_float_fallback(src - uint8_t(negative), &d)) {
return NUMBER_ERROR;
}
return d;
}
} // unnamed namespace
#endif // SIMDJSON_SKIPNUMBERPARSING
} // namespace numberparsing
inline std::ostream& operator<<(std::ostream& out, number_type type) noexcept {
switch (type) {
case number_type::signed_integer: out << "integer in [-9223372036854775808,9223372036854775808)"; break;
case number_type::unsigned_integer: out << "unsigned integer in [9223372036854775808,18446744073709551616)"; break;
case number_type::floating_point_number: out << "floating-point number (binary64)"; break;
case number_type::big_integer: out << "big integer"; break;
default: SIMDJSON_UNREACHABLE();
}
return out;
}
} // namespace haswell
} // namespace simdjson
#endif // SIMDJSON_GENERIC_NUMBERPARSING_H
/* end file simdjson/generic/numberparsing.h for haswell */
/* including simdjson/generic/implementation_simdjson_result_base-inl.h for haswell: #include "simdjson/generic/implementation_simdjson_result_base-inl.h" */
/* begin file simdjson/generic/implementation_simdjson_result_base-inl.h for haswell */
#ifndef SIMDJSON_GENERIC_IMPLEMENTATION_SIMDJSON_RESULT_BASE_INL_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_GENERIC_IMPLEMENTATION_SIMDJSON_RESULT_BASE_INL_H */
/* amalgamation skipped (editor-only): #include "simdjson/generic/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/generic/implementation_simdjson_result_base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace haswell {
//
// internal::implementation_simdjson_result_base<T> inline implementation
//
template<typename T>
simdjson_inline void implementation_simdjson_result_base<T>::tie(T &value, error_code &error) && noexcept {
error = this->second;
if (!error) {
value = std::forward<implementation_simdjson_result_base<T>>(*this).first;
}
}
template<typename T>
simdjson_warn_unused simdjson_inline error_code implementation_simdjson_result_base<T>::get(T &value) && noexcept {
error_code error;
std::forward<implementation_simdjson_result_base<T>>(*this).tie(value, error);
return error;
}
template<typename T>
simdjson_inline error_code implementation_simdjson_result_base<T>::error() const noexcept {
return this->second;
}
#if SIMDJSON_EXCEPTIONS
template<typename T>
simdjson_inline T& implementation_simdjson_result_base<T>::value() & noexcept(false) {
if (error()) { throw simdjson_error(error()); }
return this->first;
}
template<typename T>
simdjson_inline T&& implementation_simdjson_result_base<T>::value() && noexcept(false) {
return std::forward<implementation_simdjson_result_base<T>>(*this).take_value();
}
template<typename T>
simdjson_inline T&& implementation_simdjson_result_base<T>::take_value() && noexcept(false) {
if (error()) { throw simdjson_error(error()); }
return std::forward<T>(this->first);
}
template<typename T>
simdjson_inline implementation_simdjson_result_base<T>::operator T&&() && noexcept(false) {
return std::forward<implementation_simdjson_result_base<T>>(*this).take_value();
}
#endif // SIMDJSON_EXCEPTIONS
template<typename T>
simdjson_inline const T& implementation_simdjson_result_base<T>::value_unsafe() const& noexcept {
return this->first;
}
template<typename T>
simdjson_inline T& implementation_simdjson_result_base<T>::value_unsafe() & noexcept {
return this->first;
}
template<typename T>
simdjson_inline T&& implementation_simdjson_result_base<T>::value_unsafe() && noexcept {
return std::forward<T>(this->first);
}
template<typename T>
simdjson_inline implementation_simdjson_result_base<T>::implementation_simdjson_result_base(T &&value, error_code error) noexcept
: first{std::forward<T>(value)}, second{error} {}
template<typename T>
simdjson_inline implementation_simdjson_result_base<T>::implementation_simdjson_result_base(error_code error) noexcept
: implementation_simdjson_result_base(T{}, error) {}
template<typename T>
simdjson_inline implementation_simdjson_result_base<T>::implementation_simdjson_result_base(T &&value) noexcept
: implementation_simdjson_result_base(std::forward<T>(value), SUCCESS) {}
} // namespace haswell
} // namespace simdjson
#endif // SIMDJSON_GENERIC_IMPLEMENTATION_SIMDJSON_RESULT_BASE_INL_H
/* end file simdjson/generic/implementation_simdjson_result_base-inl.h for haswell */
/* end file simdjson/generic/amalgamated.h for haswell */
/* including simdjson/haswell/end.h: #include "simdjson/haswell/end.h" */
/* begin file simdjson/haswell/end.h */
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/haswell/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#if !SIMDJSON_CAN_ALWAYS_RUN_HASWELL
SIMDJSON_UNTARGET_REGION
#endif
/* undefining SIMDJSON_IMPLEMENTATION from "haswell" */
#undef SIMDJSON_IMPLEMENTATION
/* end file simdjson/haswell/end.h */
#endif // SIMDJSON_HASWELL_H
/* end file simdjson/haswell.h */
/* including simdjson/haswell/implementation.h: #include <simdjson/haswell/implementation.h> */
/* begin file simdjson/haswell/implementation.h */
#ifndef SIMDJSON_HASWELL_IMPLEMENTATION_H
#define SIMDJSON_HASWELL_IMPLEMENTATION_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/haswell/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/implementation.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/instruction_set.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
// The constructor may be executed on any host, so we take care not to use SIMDJSON_TARGET_HASWELL
namespace simdjson {
namespace haswell {
/**
* @private
*/
class implementation final : public simdjson::implementation {
public:
simdjson_inline implementation() : simdjson::implementation(
"haswell",
"Intel/AMD AVX2",
internal::instruction_set::AVX2 | internal::instruction_set::PCLMULQDQ | internal::instruction_set::BMI1 | internal::instruction_set::BMI2
) {}
simdjson_warn_unused error_code create_dom_parser_implementation(
size_t capacity,
size_t max_length,
std::unique_ptr<internal::dom_parser_implementation>& dst
) const noexcept final;
simdjson_warn_unused error_code minify(const uint8_t *buf, size_t len, uint8_t *dst, size_t &dst_len) const noexcept final;
simdjson_warn_unused bool validate_utf8(const char *buf, size_t len) const noexcept final;
};
} // namespace haswell
} // namespace simdjson
#endif // SIMDJSON_HASWELL_IMPLEMENTATION_H
/* end file simdjson/haswell/implementation.h */
/* including simdjson/haswell/begin.h: #include <simdjson/haswell/begin.h> */
/* begin file simdjson/haswell/begin.h */
/* defining SIMDJSON_IMPLEMENTATION to "haswell" */
#define SIMDJSON_IMPLEMENTATION haswell
/* including simdjson/haswell/base.h: #include "simdjson/haswell/base.h" */
/* begin file simdjson/haswell/base.h */
#ifndef SIMDJSON_HASWELL_BASE_H
#define SIMDJSON_HASWELL_BASE_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
// The constructor may be executed on any host, so we take care not to use SIMDJSON_TARGET_HASWELL
namespace simdjson {
/**
* Implementation for Haswell (Intel AVX2).
*/
namespace haswell {
class implementation;
namespace {
namespace simd {
template <typename T> struct simd8;
template <typename T> struct simd8x64;
} // namespace simd
} // unnamed namespace
} // namespace haswell
} // namespace simdjson
#endif // SIMDJSON_HASWELL_BASE_H
/* end file simdjson/haswell/base.h */
/* including simdjson/haswell/intrinsics.h: #include "simdjson/haswell/intrinsics.h" */
/* begin file simdjson/haswell/intrinsics.h */
#ifndef SIMDJSON_HASWELL_INTRINSICS_H
#define SIMDJSON_HASWELL_INTRINSICS_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/haswell/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#if SIMDJSON_VISUAL_STUDIO
// under clang within visual studio, this will include <x86intrin.h>
#include <intrin.h> // visual studio or clang
#else
#include <x86intrin.h> // elsewhere
#endif // SIMDJSON_VISUAL_STUDIO
#if SIMDJSON_CLANG_VISUAL_STUDIO
/**
* You are not supposed, normally, to include these
* headers directly. Instead you should either include intrin.h
* or x86intrin.h. However, when compiling with clang
* under Windows (i.e., when _MSC_VER is set), these headers
* only get included *if* the corresponding features are detected
* from macros:
* e.g., if __AVX2__ is set... in turn, we normally set these
* macros by compiling against the corresponding architecture
* (e.g., arch:AVX2, -mavx2, etc.) which compiles the whole
* software with these advanced instructions. In simdjson, we
* want to compile the whole program for a generic target,
* and only target our specific kernels. As a workaround,
* we directly include the needed headers. These headers would
* normally guard against such usage, but we carefully included
* <x86intrin.h> (or <intrin.h>) before, so the headers
* are fooled.
*/
#include <bmiintrin.h> // for _blsr_u64
#include <lzcntintrin.h> // for __lzcnt64
#include <immintrin.h> // for most things (AVX2, AVX512, _popcnt64)
#include <smmintrin.h>
#include <tmmintrin.h>
#include <avxintrin.h>
#include <avx2intrin.h>
#include <wmmintrin.h> // for _mm_clmulepi64_si128
// unfortunately, we may not get _blsr_u64, but, thankfully, clang
// has it as a macro.
#ifndef _blsr_u64
// we roll our own
#define _blsr_u64(n) ((n - 1) & n)
#endif // _blsr_u64
#endif // SIMDJSON_CLANG_VISUAL_STUDIO
static_assert(sizeof(__m256i) <= simdjson::SIMDJSON_PADDING, "insufficient padding for haswell kernel.");
#endif // SIMDJSON_HASWELL_INTRINSICS_H
/* end file simdjson/haswell/intrinsics.h */
#if !SIMDJSON_CAN_ALWAYS_RUN_HASWELL
SIMDJSON_TARGET_REGION("avx2,bmi,pclmul,lzcnt,popcnt")
#endif
/* including simdjson/haswell/bitmanipulation.h: #include "simdjson/haswell/bitmanipulation.h" */
/* begin file simdjson/haswell/bitmanipulation.h */
#ifndef SIMDJSON_HASWELL_BITMANIPULATION_H
#define SIMDJSON_HASWELL_BITMANIPULATION_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/haswell/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/haswell/intrinsics.h" */
/* amalgamation skipped (editor-only): #include "simdjson/haswell/bitmask.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace haswell {
namespace {
// We sometimes call trailing_zero on inputs that are zero,
// but the algorithms do not end up using the returned value.
// Sadly, sanitizers are not smart enough to figure it out.
SIMDJSON_NO_SANITIZE_UNDEFINED
// This function can be used safely even if not all bytes have been
// initialized.
// See issue https://github.com/simdjson/simdjson/issues/1965
SIMDJSON_NO_SANITIZE_MEMORY
simdjson_inline int trailing_zeroes(uint64_t input_num) {
#if SIMDJSON_REGULAR_VISUAL_STUDIO
return (int)_tzcnt_u64(input_num);
#else // SIMDJSON_REGULAR_VISUAL_STUDIO
////////
// You might expect the next line to be equivalent to
// return (int)_tzcnt_u64(input_num);
// but the generated code differs and might be less efficient?
////////
return __builtin_ctzll(input_num);
#endif // SIMDJSON_REGULAR_VISUAL_STUDIO
}
/* result might be undefined when input_num is zero */
simdjson_inline uint64_t clear_lowest_bit(uint64_t input_num) {
return _blsr_u64(input_num);
}
/* result might be undefined when input_num is zero */
simdjson_inline int leading_zeroes(uint64_t input_num) {
return int(_lzcnt_u64(input_num));
}
#if SIMDJSON_REGULAR_VISUAL_STUDIO
simdjson_inline unsigned __int64 count_ones(uint64_t input_num) {
// note: we do not support legacy 32-bit Windows in this kernel
return __popcnt64(input_num);// Visual Studio wants two underscores
}
#else
simdjson_inline long long int count_ones(uint64_t input_num) {
return _popcnt64(input_num);
}
#endif
simdjson_inline bool add_overflow(uint64_t value1, uint64_t value2,
uint64_t *result) {
#if SIMDJSON_REGULAR_VISUAL_STUDIO
return _addcarry_u64(0, value1, value2,
reinterpret_cast<unsigned __int64 *>(result));
#else
return __builtin_uaddll_overflow(value1, value2,
reinterpret_cast<unsigned long long *>(result));
#endif
}
} // unnamed namespace
} // namespace haswell
} // namespace simdjson
#endif // SIMDJSON_HASWELL_BITMANIPULATION_H
/* end file simdjson/haswell/bitmanipulation.h */
/* including simdjson/haswell/bitmask.h: #include "simdjson/haswell/bitmask.h" */
/* begin file simdjson/haswell/bitmask.h */
#ifndef SIMDJSON_HASWELL_BITMASK_H
#define SIMDJSON_HASWELL_BITMASK_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/haswell/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/haswell/intrinsics.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace haswell {
namespace {
//
// Perform a "cumulative bitwise xor," flipping bits each time a 1 is encountered.
//
// For example, prefix_xor(00100100) == 00011100
//
simdjson_inline uint64_t prefix_xor(const uint64_t bitmask) {
// There should be no such thing with a processor supporting avx2
// but not clmul.
__m128i all_ones = _mm_set1_epi8('\xFF');
__m128i result = _mm_clmulepi64_si128(_mm_set_epi64x(0ULL, bitmask), all_ones, 0);
return _mm_cvtsi128_si64(result);
}
} // unnamed namespace
} // namespace haswell
} // namespace simdjson
#endif // SIMDJSON_HASWELL_BITMASK_H
/* end file simdjson/haswell/bitmask.h */
/* including simdjson/haswell/numberparsing_defs.h: #include "simdjson/haswell/numberparsing_defs.h" */
/* begin file simdjson/haswell/numberparsing_defs.h */
#ifndef SIMDJSON_HASWELL_NUMBERPARSING_DEFS_H
#define SIMDJSON_HASWELL_NUMBERPARSING_DEFS_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/haswell/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/haswell/intrinsics.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/internal/numberparsing_tables.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace haswell {
namespace numberparsing {
/** @private */
static simdjson_inline uint32_t parse_eight_digits_unrolled(const uint8_t *chars) {
// this actually computes *16* values so we are being wasteful.
const __m128i ascii0 = _mm_set1_epi8('0');
const __m128i mul_1_10 =
_mm_setr_epi8(10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1);
const __m128i mul_1_100 = _mm_setr_epi16(100, 1, 100, 1, 100, 1, 100, 1);
const __m128i mul_1_10000 =
_mm_setr_epi16(10000, 1, 10000, 1, 10000, 1, 10000, 1);
const __m128i input = _mm_sub_epi8(
_mm_loadu_si128(reinterpret_cast<const __m128i *>(chars)), ascii0);
const __m128i t1 = _mm_maddubs_epi16(input, mul_1_10);
const __m128i t2 = _mm_madd_epi16(t1, mul_1_100);
const __m128i t3 = _mm_packus_epi32(t2, t2);
const __m128i t4 = _mm_madd_epi16(t3, mul_1_10000);
return _mm_cvtsi128_si32(
t4); // only captures the sum of the first 8 digits, drop the rest
}
/** @private */
simdjson_inline internal::value128 full_multiplication(uint64_t value1, uint64_t value2) {
internal::value128 answer;
#if SIMDJSON_REGULAR_VISUAL_STUDIO || SIMDJSON_IS_32BITS
#ifdef _M_ARM64
// ARM64 has native support for 64-bit multiplications, no need to emultate
answer.high = __umulh(value1, value2);
answer.low = value1 * value2;
#else
answer.low = _umul128(value1, value2, &answer.high); // _umul128 not available on ARM64
#endif // _M_ARM64
#else // SIMDJSON_REGULAR_VISUAL_STUDIO || SIMDJSON_IS_32BITS
__uint128_t r = (static_cast<__uint128_t>(value1)) * value2;
answer.low = uint64_t(r);
answer.high = uint64_t(r >> 64);
#endif
return answer;
}
} // namespace numberparsing
} // namespace haswell
} // namespace simdjson
#define SIMDJSON_SWAR_NUMBER_PARSING 1
#endif // SIMDJSON_HASWELL_NUMBERPARSING_DEFS_H
/* end file simdjson/haswell/numberparsing_defs.h */
/* including simdjson/haswell/simd.h: #include "simdjson/haswell/simd.h" */
/* begin file simdjson/haswell/simd.h */
#ifndef SIMDJSON_HASWELL_SIMD_H
#define SIMDJSON_HASWELL_SIMD_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/haswell/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/haswell/intrinsics.h" */
/* amalgamation skipped (editor-only): #include "simdjson/haswell/bitmanipulation.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/simdprune_tables.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace haswell {
namespace {
namespace simd {
// Forward-declared so they can be used by splat and friends.
template<typename Child>
struct base {
__m256i value;
// Zero constructor
simdjson_inline base() : value{__m256i()} {}
// Conversion from SIMD register
simdjson_inline base(const __m256i _value) : value(_value) {}
// Conversion to SIMD register
simdjson_inline operator const __m256i&() const { return this->value; }
simdjson_inline operator __m256i&() { return this->value; }
// Bit operations
simdjson_inline Child operator|(const Child other) const { return _mm256_or_si256(*this, other); }
simdjson_inline Child operator&(const Child other) const { return _mm256_and_si256(*this, other); }
simdjson_inline Child operator^(const Child other) const { return _mm256_xor_si256(*this, other); }
simdjson_inline Child bit_andnot(const Child other) const { return _mm256_andnot_si256(other, *this); }
simdjson_inline Child& operator|=(const Child other) { auto this_cast = static_cast<Child*>(this); *this_cast = *this_cast | other; return *this_cast; }
simdjson_inline Child& operator&=(const Child other) { auto this_cast = static_cast<Child*>(this); *this_cast = *this_cast & other; return *this_cast; }
simdjson_inline Child& operator^=(const Child other) { auto this_cast = static_cast<Child*>(this); *this_cast = *this_cast ^ other; return *this_cast; }
};
// Forward-declared so they can be used by splat and friends.
template<typename T>
struct simd8;
template<typename T, typename Mask=simd8<bool>>
struct base8: base<simd8<T>> {
typedef uint32_t bitmask_t;
typedef uint64_t bitmask2_t;
simdjson_inline base8() : base<simd8<T>>() {}
simdjson_inline base8(const __m256i _value) : base<simd8<T>>(_value) {}
friend simdjson_really_inline Mask operator==(const simd8<T> lhs, const simd8<T> rhs) { return _mm256_cmpeq_epi8(lhs, rhs); }
static const int SIZE = sizeof(base<T>::value);
template<int N=1>
simdjson_inline simd8<T> prev(const simd8<T> prev_chunk) const {
return _mm256_alignr_epi8(*this, _mm256_permute2x128_si256(prev_chunk, *this, 0x21), 16 - N);
}
};
// SIMD byte mask type (returned by things like eq and gt)
template<>
struct simd8<bool>: base8<bool> {
static simdjson_inline simd8<bool> splat(bool _value) { return _mm256_set1_epi8(uint8_t(-(!!_value))); }
simdjson_inline simd8<bool>() : base8() {}
simdjson_inline simd8<bool>(const __m256i _value) : base8<bool>(_value) {}
// Splat constructor
simdjson_inline simd8<bool>(bool _value) : base8<bool>(splat(_value)) {}
simdjson_inline int to_bitmask() const { return _mm256_movemask_epi8(*this); }
simdjson_inline bool any() const { return !_mm256_testz_si256(*this, *this); }
simdjson_inline simd8<bool> operator~() const { return *this ^ true; }
};
template<typename T>
struct base8_numeric: base8<T> {
static simdjson_inline simd8<T> splat(T _value) { return _mm256_set1_epi8(_value); }
static simdjson_inline simd8<T> zero() { return _mm256_setzero_si256(); }
static simdjson_inline simd8<T> load(const T values[32]) {
return _mm256_loadu_si256(reinterpret_cast<const __m256i *>(values));
}
// Repeat 16 values as many times as necessary (usually for lookup tables)
static simdjson_inline simd8<T> repeat_16(
T v0, T v1, T v2, T v3, T v4, T v5, T v6, T v7,
T v8, T v9, T v10, T v11, T v12, T v13, T v14, T v15
) {
return simd8<T>(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15,
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
);
}
simdjson_inline base8_numeric() : base8<T>() {}
simdjson_inline base8_numeric(const __m256i _value) : base8<T>(_value) {}
// Store to array
simdjson_inline void store(T dst[32]) const { return _mm256_storeu_si256(reinterpret_cast<__m256i *>(dst), *this); }
// Addition/subtraction are the same for signed and unsigned
simdjson_inline simd8<T> operator+(const simd8<T> other) const { return _mm256_add_epi8(*this, other); }
simdjson_inline simd8<T> operator-(const simd8<T> other) const { return _mm256_sub_epi8(*this, other); }
simdjson_inline simd8<T>& operator+=(const simd8<T> other) { *this = *this + other; return *static_cast<simd8<T>*>(this); }
simdjson_inline simd8<T>& operator-=(const simd8<T> other) { *this = *this - other; return *static_cast<simd8<T>*>(this); }
// Override to distinguish from bool version
simdjson_inline simd8<T> operator~() const { return *this ^ 0xFFu; }
// Perform a lookup assuming the value is between 0 and 16 (undefined behavior for out of range values)
template<typename L>
simdjson_inline simd8<L> lookup_16(simd8<L> lookup_table) const {
return _mm256_shuffle_epi8(lookup_table, *this);
}
// Copies to 'output" all bytes corresponding to a 0 in the mask (interpreted as a bitset).
// Passing a 0 value for mask would be equivalent to writing out every byte to output.
// Only the first 32 - count_ones(mask) bytes of the result are significant but 32 bytes
// get written.
// Design consideration: it seems like a function with the
// signature simd8<L> compress(uint32_t mask) would be
// sensible, but the AVX ISA makes this kind of approach difficult.
template<typename L>
simdjson_inline void compress(uint32_t mask, L * output) const {
using internal::thintable_epi8;
using internal::BitsSetTable256mul2;
using internal::pshufb_combine_table;
// this particular implementation was inspired by work done by @animetosho
// we do it in four steps, first 8 bytes and then second 8 bytes...
uint8_t mask1 = uint8_t(mask); // least significant 8 bits
uint8_t mask2 = uint8_t(mask >> 8); // second least significant 8 bits
uint8_t mask3 = uint8_t(mask >> 16); // ...
uint8_t mask4 = uint8_t(mask >> 24); // ...
// next line just loads the 64-bit values thintable_epi8[mask1] and
// thintable_epi8[mask2] into a 128-bit register, using only
// two instructions on most compilers.
__m256i shufmask = _mm256_set_epi64x(thintable_epi8[mask4], thintable_epi8[mask3],
thintable_epi8[mask2], thintable_epi8[mask1]);
// we increment by 0x08 the second half of the mask and so forth
shufmask =
_mm256_add_epi8(shufmask, _mm256_set_epi32(0x18181818, 0x18181818,
0x10101010, 0x10101010, 0x08080808, 0x08080808, 0, 0));
// this is the version "nearly pruned"
__m256i pruned = _mm256_shuffle_epi8(*this, shufmask);
// we still need to put the pieces back together.
// we compute the popcount of the first words:
int pop1 = BitsSetTable256mul2[mask1];
int pop3 = BitsSetTable256mul2[mask3];
// then load the corresponding mask
// could be done with _mm256_loadu2_m128i but many standard libraries omit this intrinsic.
__m256i v256 = _mm256_castsi128_si256(
_mm_loadu_si128(reinterpret_cast<const __m128i *>(pshufb_combine_table + pop1 * 8)));
__m256i compactmask = _mm256_insertf128_si256(v256,
_mm_loadu_si128(reinterpret_cast<const __m128i *>(pshufb_combine_table + pop3 * 8)), 1);
__m256i almostthere = _mm256_shuffle_epi8(pruned, compactmask);
// We just need to write out the result.
// This is the tricky bit that is hard to do
// if we want to return a SIMD register, since there
// is no single-instruction approach to recombine
// the two 128-bit lanes with an offset.
__m128i v128;
v128 = _mm256_castsi256_si128(almostthere);
_mm_storeu_si128( reinterpret_cast<__m128i *>(output), v128);
v128 = _mm256_extractf128_si256(almostthere, 1);
_mm_storeu_si128( reinterpret_cast<__m128i *>(output + 16 - count_ones(mask & 0xFFFF)), v128);
}
template<typename L>
simdjson_inline simd8<L> lookup_16(
L replace0, L replace1, L replace2, L replace3,
L replace4, L replace5, L replace6, L replace7,
L replace8, L replace9, L replace10, L replace11,
L replace12, L replace13, L replace14, L replace15) const {
return lookup_16(simd8<L>::repeat_16(
replace0, replace1, replace2, replace3,
replace4, replace5, replace6, replace7,
replace8, replace9, replace10, replace11,
replace12, replace13, replace14, replace15
));
}
};
// Signed bytes
template<>
struct simd8<int8_t> : base8_numeric<int8_t> {
simdjson_inline simd8() : base8_numeric<int8_t>() {}
simdjson_inline simd8(const __m256i _value) : base8_numeric<int8_t>(_value) {}
// Splat constructor
simdjson_inline simd8(int8_t _value) : simd8(splat(_value)) {}
// Array constructor
simdjson_inline simd8(const int8_t values[32]) : simd8(load(values)) {}
// Member-by-member initialization
simdjson_inline simd8(
int8_t v0, int8_t v1, int8_t v2, int8_t v3, int8_t v4, int8_t v5, int8_t v6, int8_t v7,
int8_t v8, int8_t v9, int8_t v10, int8_t v11, int8_t v12, int8_t v13, int8_t v14, int8_t v15,
int8_t v16, int8_t v17, int8_t v18, int8_t v19, int8_t v20, int8_t v21, int8_t v22, int8_t v23,
int8_t v24, int8_t v25, int8_t v26, int8_t v27, int8_t v28, int8_t v29, int8_t v30, int8_t v31
) : simd8(_mm256_setr_epi8(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15,
v16,v17,v18,v19,v20,v21,v22,v23,
v24,v25,v26,v27,v28,v29,v30,v31
)) {}
// Repeat 16 values as many times as necessary (usually for lookup tables)
simdjson_inline static simd8<int8_t> repeat_16(
int8_t v0, int8_t v1, int8_t v2, int8_t v3, int8_t v4, int8_t v5, int8_t v6, int8_t v7,
int8_t v8, int8_t v9, int8_t v10, int8_t v11, int8_t v12, int8_t v13, int8_t v14, int8_t v15
) {
return simd8<int8_t>(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15,
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
);
}
// Order-sensitive comparisons
simdjson_inline simd8<int8_t> max_val(const simd8<int8_t> other) const { return _mm256_max_epi8(*this, other); }
simdjson_inline simd8<int8_t> min_val(const simd8<int8_t> other) const { return _mm256_min_epi8(*this, other); }
simdjson_inline simd8<bool> operator>(const simd8<int8_t> other) const { return _mm256_cmpgt_epi8(*this, other); }
simdjson_inline simd8<bool> operator<(const simd8<int8_t> other) const { return _mm256_cmpgt_epi8(other, *this); }
};
// Unsigned bytes
template<>
struct simd8<uint8_t>: base8_numeric<uint8_t> {
simdjson_inline simd8() : base8_numeric<uint8_t>() {}
simdjson_inline simd8(const __m256i _value) : base8_numeric<uint8_t>(_value) {}
// Splat constructor
simdjson_inline simd8(uint8_t _value) : simd8(splat(_value)) {}
// Array constructor
simdjson_inline simd8(const uint8_t values[32]) : simd8(load(values)) {}
// Member-by-member initialization
simdjson_inline simd8(
uint8_t v0, uint8_t v1, uint8_t v2, uint8_t v3, uint8_t v4, uint8_t v5, uint8_t v6, uint8_t v7,
uint8_t v8, uint8_t v9, uint8_t v10, uint8_t v11, uint8_t v12, uint8_t v13, uint8_t v14, uint8_t v15,
uint8_t v16, uint8_t v17, uint8_t v18, uint8_t v19, uint8_t v20, uint8_t v21, uint8_t v22, uint8_t v23,
uint8_t v24, uint8_t v25, uint8_t v26, uint8_t v27, uint8_t v28, uint8_t v29, uint8_t v30, uint8_t v31
) : simd8(_mm256_setr_epi8(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15,
v16,v17,v18,v19,v20,v21,v22,v23,
v24,v25,v26,v27,v28,v29,v30,v31
)) {}
// Repeat 16 values as many times as necessary (usually for lookup tables)
simdjson_inline static simd8<uint8_t> repeat_16(
uint8_t v0, uint8_t v1, uint8_t v2, uint8_t v3, uint8_t v4, uint8_t v5, uint8_t v6, uint8_t v7,
uint8_t v8, uint8_t v9, uint8_t v10, uint8_t v11, uint8_t v12, uint8_t v13, uint8_t v14, uint8_t v15
) {
return simd8<uint8_t>(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15,
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
);
}
// Saturated math
simdjson_inline simd8<uint8_t> saturating_add(const simd8<uint8_t> other) const { return _mm256_adds_epu8(*this, other); }
simdjson_inline simd8<uint8_t> saturating_sub(const simd8<uint8_t> other) const { return _mm256_subs_epu8(*this, other); }
// Order-specific operations
simdjson_inline simd8<uint8_t> max_val(const simd8<uint8_t> other) const { return _mm256_max_epu8(*this, other); }
simdjson_inline simd8<uint8_t> min_val(const simd8<uint8_t> other) const { return _mm256_min_epu8(other, *this); }
// Same as >, but only guarantees true is nonzero (< guarantees true = -1)
simdjson_inline simd8<uint8_t> gt_bits(const simd8<uint8_t> other) const { return this->saturating_sub(other); }
// Same as <, but only guarantees true is nonzero (< guarantees true = -1)
simdjson_inline simd8<uint8_t> lt_bits(const simd8<uint8_t> other) const { return other.saturating_sub(*this); }
simdjson_inline simd8<bool> operator<=(const simd8<uint8_t> other) const { return other.max_val(*this) == other; }
simdjson_inline simd8<bool> operator>=(const simd8<uint8_t> other) const { return other.min_val(*this) == other; }
simdjson_inline simd8<bool> operator>(const simd8<uint8_t> other) const { return this->gt_bits(other).any_bits_set(); }
simdjson_inline simd8<bool> operator<(const simd8<uint8_t> other) const { return this->lt_bits(other).any_bits_set(); }
// Bit-specific operations
simdjson_inline simd8<bool> bits_not_set() const { return *this == uint8_t(0); }
simdjson_inline simd8<bool> bits_not_set(simd8<uint8_t> bits) const { return (*this & bits).bits_not_set(); }
simdjson_inline simd8<bool> any_bits_set() const { return ~this->bits_not_set(); }
simdjson_inline simd8<bool> any_bits_set(simd8<uint8_t> bits) const { return ~this->bits_not_set(bits); }
simdjson_inline bool is_ascii() const { return _mm256_movemask_epi8(*this) == 0; }
simdjson_inline bool bits_not_set_anywhere() const { return _mm256_testz_si256(*this, *this); }
simdjson_inline bool any_bits_set_anywhere() const { return !bits_not_set_anywhere(); }
simdjson_inline bool bits_not_set_anywhere(simd8<uint8_t> bits) const { return _mm256_testz_si256(*this, bits); }
simdjson_inline bool any_bits_set_anywhere(simd8<uint8_t> bits) const { return !bits_not_set_anywhere(bits); }
template<int N>
simdjson_inline simd8<uint8_t> shr() const { return simd8<uint8_t>(_mm256_srli_epi16(*this, N)) & uint8_t(0xFFu >> N); }
template<int N>
simdjson_inline simd8<uint8_t> shl() const { return simd8<uint8_t>(_mm256_slli_epi16(*this, N)) & uint8_t(0xFFu << N); }
// Get one of the bits and make a bitmask out of it.
// e.g. value.get_bit<7>() gets the high bit
template<int N>
simdjson_inline int get_bit() const { return _mm256_movemask_epi8(_mm256_slli_epi16(*this, 7-N)); }
};
template<typename T>
struct simd8x64 {
static constexpr int NUM_CHUNKS = 64 / sizeof(simd8<T>);
static_assert(NUM_CHUNKS == 2, "Haswell kernel should use two registers per 64-byte block.");
const simd8<T> chunks[NUM_CHUNKS];
simd8x64(const simd8x64<T>& o) = delete; // no copy allowed
simd8x64<T>& operator=(const simd8<T>& other) = delete; // no assignment allowed
simd8x64() = delete; // no default constructor allowed
simdjson_inline simd8x64(const simd8<T> chunk0, const simd8<T> chunk1) : chunks{chunk0, chunk1} {}
simdjson_inline simd8x64(const T ptr[64]) : chunks{simd8<T>::load(ptr), simd8<T>::load(ptr+32)} {}
simdjson_inline uint64_t compress(uint64_t mask, T * output) const {
uint32_t mask1 = uint32_t(mask);
uint32_t mask2 = uint32_t(mask >> 32);
this->chunks[0].compress(mask1, output);
this->chunks[1].compress(mask2, output + 32 - count_ones(mask1));
return 64 - count_ones(mask);
}
simdjson_inline void store(T ptr[64]) const {
this->chunks[0].store(ptr+sizeof(simd8<T>)*0);
this->chunks[1].store(ptr+sizeof(simd8<T>)*1);
}
simdjson_inline uint64_t to_bitmask() const {
uint64_t r_lo = uint32_t(this->chunks[0].to_bitmask());
uint64_t r_hi = this->chunks[1].to_bitmask();
return r_lo | (r_hi << 32);
}
simdjson_inline simd8<T> reduce_or() const {
return this->chunks[0] | this->chunks[1];
}
simdjson_inline simd8x64<T> bit_or(const T m) const {
const simd8<T> mask = simd8<T>::splat(m);
return simd8x64<T>(
this->chunks[0] | mask,
this->chunks[1] | mask
);
}
simdjson_inline uint64_t eq(const T m) const {
const simd8<T> mask = simd8<T>::splat(m);
return simd8x64<bool>(
this->chunks[0] == mask,
this->chunks[1] == mask
).to_bitmask();
}
simdjson_inline uint64_t eq(const simd8x64<uint8_t> &other) const {
return simd8x64<bool>(
this->chunks[0] == other.chunks[0],
this->chunks[1] == other.chunks[1]
).to_bitmask();
}
simdjson_inline uint64_t lteq(const T m) const {
const simd8<T> mask = simd8<T>::splat(m);
return simd8x64<bool>(
this->chunks[0] <= mask,
this->chunks[1] <= mask
).to_bitmask();
}
}; // struct simd8x64<T>
} // namespace simd
} // unnamed namespace
} // namespace haswell
} // namespace simdjson
#endif // SIMDJSON_HASWELL_SIMD_H
/* end file simdjson/haswell/simd.h */
/* including simdjson/haswell/stringparsing_defs.h: #include "simdjson/haswell/stringparsing_defs.h" */
/* begin file simdjson/haswell/stringparsing_defs.h */
#ifndef SIMDJSON_HASWELL_STRINGPARSING_DEFS_H
#define SIMDJSON_HASWELL_STRINGPARSING_DEFS_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/haswell/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/haswell/simd.h" */
/* amalgamation skipped (editor-only): #include "simdjson/haswell/bitmanipulation.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace haswell {
namespace {
using namespace simd;
// Holds backslashes and quotes locations.
struct backslash_and_quote {
public:
static constexpr uint32_t BYTES_PROCESSED = 32;
simdjson_inline static backslash_and_quote copy_and_find(const uint8_t *src, uint8_t *dst);
simdjson_inline bool has_quote_first() { return ((bs_bits - 1) & quote_bits) != 0; }
simdjson_inline bool has_backslash() { return ((quote_bits - 1) & bs_bits) != 0; }
simdjson_inline int quote_index() { return trailing_zeroes(quote_bits); }
simdjson_inline int backslash_index() { return trailing_zeroes(bs_bits); }
uint32_t bs_bits;
uint32_t quote_bits;
}; // struct backslash_and_quote
simdjson_inline backslash_and_quote backslash_and_quote::copy_and_find(const uint8_t *src, uint8_t *dst) {
// this can read up to 15 bytes beyond the buffer size, but we require
// SIMDJSON_PADDING of padding
static_assert(SIMDJSON_PADDING >= (BYTES_PROCESSED - 1), "backslash and quote finder must process fewer than SIMDJSON_PADDING bytes");
simd8<uint8_t> v(src);
// store to dest unconditionally - we can overwrite the bits we don't like later
v.store(dst);
return {
static_cast<uint32_t>((v == '\\').to_bitmask()), // bs_bits
static_cast<uint32_t>((v == '"').to_bitmask()), // quote_bits
};
}
} // unnamed namespace
} // namespace haswell
} // namespace simdjson
#endif // SIMDJSON_HASWELL_STRINGPARSING_DEFS_H
/* end file simdjson/haswell/stringparsing_defs.h */
/* end file simdjson/haswell/begin.h */
/* including generic/amalgamated.h for haswell: #include <generic/amalgamated.h> */
/* begin file generic/amalgamated.h for haswell */
#if defined(SIMDJSON_CONDITIONAL_INCLUDE) && !defined(SIMDJSON_SRC_GENERIC_DEPENDENCIES_H)
#error generic/dependencies.h must be included before generic/amalgamated.h!
#endif
/* including generic/base.h for haswell: #include <generic/base.h> */
/* begin file generic/base.h for haswell */
#ifndef SIMDJSON_SRC_GENERIC_BASE_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_BASE_H */
/* amalgamation skipped (editor-only): #include <base.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/base.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace haswell {
namespace {
struct json_character_block;
} // unnamed namespace
} // namespace haswell
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_BASE_H
/* end file generic/base.h for haswell */
/* including generic/dom_parser_implementation.h for haswell: #include <generic/dom_parser_implementation.h> */
/* begin file generic/dom_parser_implementation.h for haswell */
#ifndef SIMDJSON_SRC_GENERIC_DOM_PARSER_IMPLEMENTATION_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_DOM_PARSER_IMPLEMENTATION_H */
/* amalgamation skipped (editor-only): #include <generic/base.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/dom_parser_implementation.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
// Interface a dom parser implementation must fulfill
namespace simdjson {
namespace haswell {
namespace {
simdjson_inline simd8<uint8_t> must_be_2_3_continuation(const simd8<uint8_t> prev2, const simd8<uint8_t> prev3);
simdjson_inline bool is_ascii(const simd8x64<uint8_t>& input);
} // unnamed namespace
} // namespace haswell
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_DOM_PARSER_IMPLEMENTATION_H
/* end file generic/dom_parser_implementation.h for haswell */
/* including generic/json_character_block.h for haswell: #include <generic/json_character_block.h> */
/* begin file generic/json_character_block.h for haswell */
#ifndef SIMDJSON_SRC_GENERIC_JSON_CHARACTER_BLOCK_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_JSON_CHARACTER_BLOCK_H */
/* amalgamation skipped (editor-only): #include <generic/base.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace haswell {
namespace {
struct json_character_block {
static simdjson_inline json_character_block classify(const simd::simd8x64<uint8_t>& in);
simdjson_inline uint64_t whitespace() const noexcept { return _whitespace; }
simdjson_inline uint64_t op() const noexcept { return _op; }
simdjson_inline uint64_t scalar() const noexcept { return ~(op() | whitespace()); }
uint64_t _whitespace;
uint64_t _op;
};
} // unnamed namespace
} // namespace haswell
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_JSON_CHARACTER_BLOCK_H
/* end file generic/json_character_block.h for haswell */
/* end file generic/amalgamated.h for haswell */
/* including generic/stage1/amalgamated.h for haswell: #include <generic/stage1/amalgamated.h> */
/* begin file generic/stage1/amalgamated.h for haswell */
// Stuff other things depend on
/* including generic/stage1/base.h for haswell: #include <generic/stage1/base.h> */
/* begin file generic/stage1/base.h for haswell */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_BASE_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_BASE_H */
/* amalgamation skipped (editor-only): #include <generic/base.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace haswell {
namespace {
namespace stage1 {
class bit_indexer;
template<size_t STEP_SIZE>
struct buf_block_reader;
struct json_block;
class json_minifier;
class json_scanner;
struct json_string_block;
class json_string_scanner;
class json_structural_indexer;
} // namespace stage1
namespace utf8_validation {
struct utf8_checker;
} // namespace utf8_validation
using utf8_validation::utf8_checker;
} // unnamed namespace
} // namespace haswell
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE1_BASE_H
/* end file generic/stage1/base.h for haswell */
/* including generic/stage1/buf_block_reader.h for haswell: #include <generic/stage1/buf_block_reader.h> */
/* begin file generic/stage1/buf_block_reader.h for haswell */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_BUF_BLOCK_READER_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_BUF_BLOCK_READER_H */
/* amalgamation skipped (editor-only): #include <generic/stage1/base.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#include <cstring>
namespace simdjson {
namespace haswell {
namespace {
namespace stage1 {
// Walks through a buffer in block-sized increments, loading the last part with spaces
template<size_t STEP_SIZE>
struct buf_block_reader {
public:
simdjson_inline buf_block_reader(const uint8_t *_buf, size_t _len);
simdjson_inline size_t block_index();
simdjson_inline bool has_full_block() const;
simdjson_inline const uint8_t *full_block() const;
/**
* Get the last block, padded with spaces.
*
* There will always be a last block, with at least 1 byte, unless len == 0 (in which case this
* function fills the buffer with spaces and returns 0. In particular, if len == STEP_SIZE there
* will be 0 full_blocks and 1 remainder block with STEP_SIZE bytes and no spaces for padding.
*
* @return the number of effective characters in the last block.
*/
simdjson_inline size_t get_remainder(uint8_t *dst) const;
simdjson_inline void advance();
private:
const uint8_t *buf;
const size_t len;
const size_t lenminusstep;
size_t idx;
};
// Routines to print masks and text for debugging bitmask operations
simdjson_unused static char * format_input_text_64(const uint8_t *text) {
static char buf[sizeof(simd8x64<uint8_t>) + 1];
for (size_t i=0; i<sizeof(simd8x64<uint8_t>); i++) {
buf[i] = int8_t(text[i]) < ' ' ? '_' : int8_t(text[i]);
}
buf[sizeof(simd8x64<uint8_t>)] = '\0';
return buf;
}
// Routines to print masks and text for debugging bitmask operations
simdjson_unused static char * format_input_text(const simd8x64<uint8_t>& in) {
static char buf[sizeof(simd8x64<uint8_t>) + 1];
in.store(reinterpret_cast<uint8_t*>(buf));
for (size_t i=0; i<sizeof(simd8x64<uint8_t>); i++) {
if (buf[i] < ' ') { buf[i] = '_'; }
}
buf[sizeof(simd8x64<uint8_t>)] = '\0';
return buf;
}
simdjson_unused static char * format_input_text(const simd8x64<uint8_t>& in, uint64_t mask) {
static char buf[sizeof(simd8x64<uint8_t>) + 1];
in.store(reinterpret_cast<uint8_t*>(buf));
for (size_t i=0; i<sizeof(simd8x64<uint8_t>); i++) {
if (buf[i] <= ' ') { buf[i] = '_'; }
if (!(mask & (size_t(1) << i))) { buf[i] = ' '; }
}
buf[sizeof(simd8x64<uint8_t>)] = '\0';
return buf;
}
simdjson_unused static char * format_mask(uint64_t mask) {
static char buf[sizeof(simd8x64<uint8_t>) + 1];
for (size_t i=0; i<64; i++) {
buf[i] = (mask & (size_t(1) << i)) ? 'X' : ' ';
}
buf[64] = '\0';
return buf;
}
template<size_t STEP_SIZE>
simdjson_inline buf_block_reader<STEP_SIZE>::buf_block_reader(const uint8_t *_buf, size_t _len) : buf{_buf}, len{_len}, lenminusstep{len < STEP_SIZE ? 0 : len - STEP_SIZE}, idx{0} {}
template<size_t STEP_SIZE>
simdjson_inline size_t buf_block_reader<STEP_SIZE>::block_index() { return idx; }
template<size_t STEP_SIZE>
simdjson_inline bool buf_block_reader<STEP_SIZE>::has_full_block() const {
return idx < lenminusstep;
}
template<size_t STEP_SIZE>
simdjson_inline const uint8_t *buf_block_reader<STEP_SIZE>::full_block() const {
return &buf[idx];
}
template<size_t STEP_SIZE>
simdjson_inline size_t buf_block_reader<STEP_SIZE>::get_remainder(uint8_t *dst) const {
if(len == idx) { return 0; } // memcpy(dst, null, 0) will trigger an error with some sanitizers
std::memset(dst, 0x20, STEP_SIZE); // std::memset STEP_SIZE because it's more efficient to write out 8 or 16 bytes at once.
std::memcpy(dst, buf + idx, len - idx);
return len - idx;
}
template<size_t STEP_SIZE>
simdjson_inline void buf_block_reader<STEP_SIZE>::advance() {
idx += STEP_SIZE;
}
} // namespace stage1
} // unnamed namespace
} // namespace haswell
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE1_BUF_BLOCK_READER_H
/* end file generic/stage1/buf_block_reader.h for haswell */
/* including generic/stage1/json_escape_scanner.h for haswell: #include <generic/stage1/json_escape_scanner.h> */
/* begin file generic/stage1/json_escape_scanner.h for haswell */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_JSON_ESCAPE_SCANNER_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_JSON_ESCAPE_SCANNER_H */
/* amalgamation skipped (editor-only): #include <generic/stage1/base.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/buf_block_reader.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace haswell {
namespace {
namespace stage1 {
/**
* Scans for escape characters in JSON, taking care with multiple backslashes (\\n vs. \n).
*/
struct json_escape_scanner {
/** The actual escape characters (the backslashes themselves). */
uint64_t next_is_escaped = 0ULL;
struct escaped_and_escape {
/**
* Mask of escaped characters.
*
* ```
* \n \\n \\\n \\\\n \
* 0100100010100101000
* n \ \ n \ \
* ```
*/
uint64_t escaped;
/**
* Mask of escape characters.
*
* ```
* \n \\n \\\n \\\\n \
* 1001000101001010001
* \ \ \ \ \ \ \
* ```
*/
uint64_t escape;
};
/**
* Get a mask of both escape and escaped characters (the characters following a backslash).
*
* @param potential_escape A mask of the character that can escape others (but could be
* escaped itself). e.g. block.eq('\\')
*/
simdjson_really_inline escaped_and_escape next(uint64_t backslash) noexcept {
#if !SIMDJSON_SKIP_BACKSLASH_SHORT_CIRCUIT
if (!backslash) { return {next_escaped_without_backslashes(), 0}; }
#endif
// | | Mask (shows characters instead of 1's) | Depth | Instructions |
// |--------------------------------|----------------------------------------|-------|---------------------|
// | string | `\\n_\\\n___\\\n___\\\\___\\\\__\\\` | | |
// | | ` even odd even odd odd` | | |
// | potential_escape | ` \ \\\ \\\ \\\\ \\\\ \\\` | 1 | 1 (backslash & ~first_is_escaped)
// | escape_and_terminal_code | ` \n \ \n \ \n \ \ \ \ \ \` | 5 | 5 (next_escape_and_terminal_code())
// | escaped | `\ \ n \ n \ \ \ \ \ ` X | 6 | 7 (escape_and_terminal_code ^ (potential_escape | first_is_escaped))
// | escape | ` \ \ \ \ \ \ \ \ \ \` | 6 | 8 (escape_and_terminal_code & backslash)
// | first_is_escaped | `\ ` | 7 (*) | 9 (escape >> 63) ()
// (*) this is not needed until the next iteration
uint64_t escape_and_terminal_code = next_escape_and_terminal_code(backslash & ~this->next_is_escaped);
uint64_t escaped = escape_and_terminal_code ^ (backslash | this->next_is_escaped);
uint64_t escape = escape_and_terminal_code & backslash;
this->next_is_escaped = escape >> 63;
return {escaped, escape};
}
private:
static constexpr const uint64_t ODD_BITS = 0xAAAAAAAAAAAAAAAAULL;
simdjson_really_inline uint64_t next_escaped_without_backslashes() noexcept {
uint64_t escaped = this->next_is_escaped;
this->next_is_escaped = 0;
return escaped;
}
/**
* Returns a mask of the next escape characters (masking out escaped backslashes), along with
* any non-backslash escape codes.
*
* \n \\n \\\n \\\\n returns:
* \n \ \ \n \ \
* 11 100 1011 10100
*
* You are expected to mask out the first bit yourself if the previous block had a trailing
* escape.
*
* & the result with potential_escape to get just the escape characters.
* ^ the result with (potential_escape | first_is_escaped) to get escaped characters.
*/
static simdjson_really_inline uint64_t next_escape_and_terminal_code(uint64_t potential_escape) noexcept {
// If we were to just shift and mask out any odd bits, we'd actually get a *half* right answer:
// any even-aligned backslash runs would be correct! Odd-aligned backslash runs would be
// inverted (\\\ would be 010 instead of 101).
//
// ```
// string: | ____\\\\_\\\\_____ |
// maybe_escaped | ODD | \ \ \ \ |
// even-aligned ^^^ ^^^^ odd-aligned
// ```
//
// Taking that into account, our basic strategy is:
//
// 1. Use subtraction to produce a mask with 1's for even-aligned runs and 0's for
// odd-aligned runs.
// 2. XOR all odd bits, which masks out the odd bits in even-aligned runs, and brings IN the
// odd bits in odd-aligned runs.
// 3. & with backslash to clean up any stray bits.
// runs are set to 0, and then XORing with "odd":
//
// | | Mask (shows characters instead of 1's) | Instructions |
// |--------------------------------|----------------------------------------|---------------------|
// | string | `\\n_\\\n___\\\n___\\\\___\\\\__\\\` |
// | | ` even odd even odd odd` |
// | maybe_escaped | ` n \\n \\n \\\_ \\\_ \\` X | 1 (potential_escape << 1)
// | maybe_escaped_and_odd | ` \n_ \\n _ \\\n_ _ \\\__ _\\\_ \\\` | 1 (maybe_escaped | odd)
// | even_series_codes_and_odd | ` n_\\\ _ n_ _\\\\ _ _ ` | 1 (maybe_escaped_and_odd - potential_escape)
// | escape_and_terminal_code | ` \n \ \n \ \n \ \ \ \ \ \` | 1 (^ odd)
//
// Escaped characters are characters following an escape.
uint64_t maybe_escaped = potential_escape << 1;
// To distinguish odd from even escape sequences, therefore, we turn on any *starting*
// escapes that are on an odd byte. (We actually bring in all odd bits, for speed.)
// - Odd runs of backslashes are 0000, and the code at the end ("n" in \n or \\n) is 1.
// - Odd runs of backslashes are 1111, and the code at the end ("n" in \n or \\n) is 0.
// - All other odd bytes are 1, and even bytes are 0.
uint64_t maybe_escaped_and_odd_bits = maybe_escaped | ODD_BITS;
uint64_t even_series_codes_and_odd_bits = maybe_escaped_and_odd_bits - potential_escape;
// Now we flip all odd bytes back with xor. This:
// - Makes odd runs of backslashes go from 0000 to 1010
// - Makes even runs of backslashes go from 1111 to 1010
// - Sets actually-escaped codes to 1 (the n in \n and \\n: \n = 11, \\n = 100)
// - Resets all other bytes to 0
return even_series_codes_and_odd_bits ^ ODD_BITS;
}
};
} // namespace stage1
} // unnamed namespace
} // namespace haswell
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE1_JSON_STRING_SCANNER_H
/* end file generic/stage1/json_escape_scanner.h for haswell */
/* including generic/stage1/json_string_scanner.h for haswell: #include <generic/stage1/json_string_scanner.h> */
/* begin file generic/stage1/json_string_scanner.h for haswell */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_JSON_STRING_SCANNER_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_JSON_STRING_SCANNER_H */
/* amalgamation skipped (editor-only): #include <generic/stage1/base.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/json_escape_scanner.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace haswell {
namespace {
namespace stage1 {
struct json_string_block {
// We spell out the constructors in the hope of resolving inlining issues with Visual Studio 2017
simdjson_really_inline json_string_block(uint64_t escaped, uint64_t quote, uint64_t in_string) :
_escaped(escaped), _quote(quote), _in_string(in_string) {}
// Escaped characters (characters following an escape() character)
simdjson_really_inline uint64_t escaped() const { return _escaped; }
// Real (non-backslashed) quotes
simdjson_really_inline uint64_t quote() const { return _quote; }
// Only characters inside the string (not including the quotes)
simdjson_really_inline uint64_t string_content() const { return _in_string & ~_quote; }
// Return a mask of whether the given characters are inside a string (only works on non-quotes)
simdjson_really_inline uint64_t non_quote_inside_string(uint64_t mask) const { return mask & _in_string; }
// Return a mask of whether the given characters are inside a string (only works on non-quotes)
simdjson_really_inline uint64_t non_quote_outside_string(uint64_t mask) const { return mask & ~_in_string; }
// Tail of string (everything except the start quote)
simdjson_really_inline uint64_t string_tail() const { return _in_string ^ _quote; }
// escaped characters (backslashed--does not include the hex characters after \u)
uint64_t _escaped;
// real quotes (non-escaped ones)
uint64_t _quote;
// string characters (includes start quote but not end quote)
uint64_t _in_string;
};
// Scans blocks for string characters, storing the state necessary to do so
class json_string_scanner {
public:
simdjson_really_inline json_string_block next(const simd::simd8x64<uint8_t>& in);
// Returns either UNCLOSED_STRING or SUCCESS
simdjson_really_inline error_code finish();
private:
// Scans for escape characters
json_escape_scanner escape_scanner{};
// Whether the last iteration was still inside a string (all 1's = true, all 0's = false).
uint64_t prev_in_string = 0ULL;
};
//
// Return a mask of all string characters plus end quotes.
//
// prev_escaped is overflow saying whether the next character is escaped.
// prev_in_string is overflow saying whether we're still in a string.
//
// Backslash sequences outside of quotes will be detected in stage 2.
//
simdjson_really_inline json_string_block json_string_scanner::next(const simd::simd8x64<uint8_t>& in) {
const uint64_t backslash = in.eq('\\');
const uint64_t escaped = escape_scanner.next(backslash).escaped;
const uint64_t quote = in.eq('"') & ~escaped;
//
// prefix_xor flips on bits inside the string (and flips off the end quote).
//
// Then we xor with prev_in_string: if we were in a string already, its effect is flipped
// (characters inside strings are outside, and characters outside strings are inside).
//
const uint64_t in_string = prefix_xor(quote) ^ prev_in_string;
//
// Check if we're still in a string at the end of the box so the next block will know
//
prev_in_string = uint64_t(static_cast<int64_t>(in_string) >> 63);
// Use ^ to turn the beginning quote off, and the end quote on.
// We are returning a function-local object so either we get a move constructor
// or we get copy elision.
return json_string_block(escaped, quote, in_string);
}
simdjson_really_inline error_code json_string_scanner::finish() {
if (prev_in_string) {
return UNCLOSED_STRING;
}
return SUCCESS;
}
} // namespace stage1
} // unnamed namespace
} // namespace haswell
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE1_JSON_STRING_SCANNER_H
/* end file generic/stage1/json_string_scanner.h for haswell */
/* including generic/stage1/utf8_lookup4_algorithm.h for haswell: #include <generic/stage1/utf8_lookup4_algorithm.h> */
/* begin file generic/stage1/utf8_lookup4_algorithm.h for haswell */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_UTF8_LOOKUP4_ALGORITHM_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_UTF8_LOOKUP4_ALGORITHM_H */
/* amalgamation skipped (editor-only): #include <generic/stage1/base.h> */
/* amalgamation skipped (editor-only): #include <generic/dom_parser_implementation.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace haswell {
namespace {
namespace utf8_validation {
using namespace simd;
simdjson_inline simd8<uint8_t> check_special_cases(const simd8<uint8_t> input, const simd8<uint8_t> prev1) {
// Bit 0 = Too Short (lead byte/ASCII followed by lead byte/ASCII)
// Bit 1 = Too Long (ASCII followed by continuation)
// Bit 2 = Overlong 3-byte
// Bit 4 = Surrogate
// Bit 5 = Overlong 2-byte
// Bit 7 = Two Continuations
constexpr const uint8_t TOO_SHORT = 1<<0; // 11______ 0_______
// 11______ 11______
constexpr const uint8_t TOO_LONG = 1<<1; // 0_______ 10______
constexpr const uint8_t OVERLONG_3 = 1<<2; // 11100000 100_____
constexpr const uint8_t SURROGATE = 1<<4; // 11101101 101_____
constexpr const uint8_t OVERLONG_2 = 1<<5; // 1100000_ 10______
constexpr const uint8_t TWO_CONTS = 1<<7; // 10______ 10______
constexpr const uint8_t TOO_LARGE = 1<<3; // 11110100 1001____
// 11110100 101_____
// 11110101 1001____
// 11110101 101_____
// 1111011_ 1001____
// 1111011_ 101_____
// 11111___ 1001____
// 11111___ 101_____
constexpr const uint8_t TOO_LARGE_1000 = 1<<6;
// 11110101 1000____
// 1111011_ 1000____
// 11111___ 1000____
constexpr const uint8_t OVERLONG_4 = 1<<6; // 11110000 1000____
const simd8<uint8_t> byte_1_high = prev1.shr<4>().lookup_16<uint8_t>(
// 0_______ ________ <ASCII in byte 1>
TOO_LONG, TOO_LONG, TOO_LONG, TOO_LONG,
TOO_LONG, TOO_LONG, TOO_LONG, TOO_LONG,
// 10______ ________ <continuation in byte 1>
TWO_CONTS, TWO_CONTS, TWO_CONTS, TWO_CONTS,
// 1100____ ________ <two byte lead in byte 1>
TOO_SHORT | OVERLONG_2,
// 1101____ ________ <two byte lead in byte 1>
TOO_SHORT,
// 1110____ ________ <three byte lead in byte 1>
TOO_SHORT | OVERLONG_3 | SURROGATE,
// 1111____ ________ <four+ byte lead in byte 1>
TOO_SHORT | TOO_LARGE | TOO_LARGE_1000 | OVERLONG_4
);
constexpr const uint8_t CARRY = TOO_SHORT | TOO_LONG | TWO_CONTS; // These all have ____ in byte 1 .
const simd8<uint8_t> byte_1_low = (prev1 & 0x0F).lookup_16<uint8_t>(
// ____0000 ________
CARRY | OVERLONG_3 | OVERLONG_2 | OVERLONG_4,
// ____0001 ________
CARRY | OVERLONG_2,
// ____001_ ________
CARRY,
CARRY,
// ____0100 ________
CARRY | TOO_LARGE,
// ____0101 ________
CARRY | TOO_LARGE | TOO_LARGE_1000,
// ____011_ ________
CARRY | TOO_LARGE | TOO_LARGE_1000,
CARRY | TOO_LARGE | TOO_LARGE_1000,
// ____1___ ________
CARRY | TOO_LARGE | TOO_LARGE_1000,
CARRY | TOO_LARGE | TOO_LARGE_1000,
CARRY | TOO_LARGE | TOO_LARGE_1000,
CARRY | TOO_LARGE | TOO_LARGE_1000,
CARRY | TOO_LARGE | TOO_LARGE_1000,
// ____1101 ________
CARRY | TOO_LARGE | TOO_LARGE_1000 | SURROGATE,
CARRY | TOO_LARGE | TOO_LARGE_1000,
CARRY | TOO_LARGE | TOO_LARGE_1000
);
const simd8<uint8_t> byte_2_high = input.shr<4>().lookup_16<uint8_t>(
// ________ 0_______ <ASCII in byte 2>
TOO_SHORT, TOO_SHORT, TOO_SHORT, TOO_SHORT,
TOO_SHORT, TOO_SHORT, TOO_SHORT, TOO_SHORT,
// ________ 1000____
TOO_LONG | OVERLONG_2 | TWO_CONTS | OVERLONG_3 | TOO_LARGE_1000 | OVERLONG_4,
// ________ 1001____
TOO_LONG | OVERLONG_2 | TWO_CONTS | OVERLONG_3 | TOO_LARGE,
// ________ 101_____
TOO_LONG | OVERLONG_2 | TWO_CONTS | SURROGATE | TOO_LARGE,
TOO_LONG | OVERLONG_2 | TWO_CONTS | SURROGATE | TOO_LARGE,
// ________ 11______
TOO_SHORT, TOO_SHORT, TOO_SHORT, TOO_SHORT
);
return (byte_1_high & byte_1_low & byte_2_high);
}
simdjson_inline simd8<uint8_t> check_multibyte_lengths(const simd8<uint8_t> input,
const simd8<uint8_t> prev_input, const simd8<uint8_t> sc) {
simd8<uint8_t> prev2 = input.prev<2>(prev_input);
simd8<uint8_t> prev3 = input.prev<3>(prev_input);
simd8<uint8_t> must23 = must_be_2_3_continuation(prev2, prev3);
simd8<uint8_t> must23_80 = must23 & uint8_t(0x80);
return must23_80 ^ sc;
}
//
// Return nonzero if there are incomplete multibyte characters at the end of the block:
// e.g. if there is a 4-byte character, but it's 3 bytes from the end.
//
simdjson_inline simd8<uint8_t> is_incomplete(const simd8<uint8_t> input) {
// If the previous input's last 3 bytes match this, they're too short (they ended at EOF):
// ... 1111____ 111_____ 11______
#if SIMDJSON_IMPLEMENTATION_ICELAKE
static const uint8_t max_array[64] = {
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 0xf0u-1, 0xe0u-1, 0xc0u-1
};
#else
static const uint8_t max_array[32] = {
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 0xf0u-1, 0xe0u-1, 0xc0u-1
};
#endif
const simd8<uint8_t> max_value(&max_array[sizeof(max_array)-sizeof(simd8<uint8_t>)]);
return input.gt_bits(max_value);
}
struct utf8_checker {
// If this is nonzero, there has been a UTF-8 error.
simd8<uint8_t> error;
// The last input we received
simd8<uint8_t> prev_input_block;
// Whether the last input we received was incomplete (used for ASCII fast path)
simd8<uint8_t> prev_incomplete;
//
// Check whether the current bytes are valid UTF-8.
//
simdjson_inline void check_utf8_bytes(const simd8<uint8_t> input, const simd8<uint8_t> prev_input) {
// Flip prev1...prev3 so we can easily determine if they are 2+, 3+ or 4+ lead bytes
// (2, 3, 4-byte leads become large positive numbers instead of small negative numbers)
simd8<uint8_t> prev1 = input.prev<1>(prev_input);
simd8<uint8_t> sc = check_special_cases(input, prev1);
this->error |= check_multibyte_lengths(input, prev_input, sc);
}
// The only problem that can happen at EOF is that a multibyte character is too short
// or a byte value too large in the last bytes: check_special_cases only checks for bytes
// too large in the first of two bytes.
simdjson_inline void check_eof() {
// If the previous block had incomplete UTF-8 characters at the end, an ASCII block can't
// possibly finish them.
this->error |= this->prev_incomplete;
}
simdjson_inline void check_next_input(const simd8x64<uint8_t>& input) {
if(simdjson_likely(is_ascii(input))) {
this->error |= this->prev_incomplete;
} else {
// you might think that a for-loop would work, but under Visual Studio, it is not good enough.
static_assert((simd8x64<uint8_t>::NUM_CHUNKS == 1)
||(simd8x64<uint8_t>::NUM_CHUNKS == 2)
|| (simd8x64<uint8_t>::NUM_CHUNKS == 4),
"We support one, two or four chunks per 64-byte block.");
SIMDJSON_IF_CONSTEXPR (simd8x64<uint8_t>::NUM_CHUNKS == 1) {
this->check_utf8_bytes(input.chunks[0], this->prev_input_block);
} else SIMDJSON_IF_CONSTEXPR (simd8x64<uint8_t>::NUM_CHUNKS == 2) {
this->check_utf8_bytes(input.chunks[0], this->prev_input_block);
this->check_utf8_bytes(input.chunks[1], input.chunks[0]);
} else SIMDJSON_IF_CONSTEXPR (simd8x64<uint8_t>::NUM_CHUNKS == 4) {
this->check_utf8_bytes(input.chunks[0], this->prev_input_block);
this->check_utf8_bytes(input.chunks[1], input.chunks[0]);
this->check_utf8_bytes(input.chunks[2], input.chunks[1]);
this->check_utf8_bytes(input.chunks[3], input.chunks[2]);
}
this->prev_incomplete = is_incomplete(input.chunks[simd8x64<uint8_t>::NUM_CHUNKS-1]);
this->prev_input_block = input.chunks[simd8x64<uint8_t>::NUM_CHUNKS-1];
}
}
// do not forget to call check_eof!
simdjson_inline error_code errors() {
return this->error.any_bits_set_anywhere() ? error_code::UTF8_ERROR : error_code::SUCCESS;
}
}; // struct utf8_checker
} // namespace utf8_validation
} // unnamed namespace
} // namespace haswell
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE1_UTF8_LOOKUP4_ALGORITHM_H
/* end file generic/stage1/utf8_lookup4_algorithm.h for haswell */
/* including generic/stage1/json_scanner.h for haswell: #include <generic/stage1/json_scanner.h> */
/* begin file generic/stage1/json_scanner.h for haswell */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_JSON_SCANNER_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_JSON_SCANNER_H */
/* amalgamation skipped (editor-only): #include <generic/stage1/base.h> */
/* amalgamation skipped (editor-only): #include <generic/json_character_block.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/json_string_scanner.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace haswell {
namespace {
namespace stage1 {
/**
* A block of scanned json, with information on operators and scalars.
*
* We seek to identify pseudo-structural characters. Anything that is inside
* a string must be omitted (hence & ~_string.string_tail()).
* Otherwise, pseudo-structural characters come in two forms.
* 1. We have the structural characters ([,],{,},:, comma). The
* term 'structural character' is from the JSON RFC.
* 2. We have the 'scalar pseudo-structural characters'.
* Scalars are quotes, and any character except structural characters and white space.
*
* To identify the scalar pseudo-structural characters, we must look at what comes
* before them: it must be a space, a quote or a structural characters.
* Starting with simdjson v0.3, we identify them by
* negation: we identify everything that is followed by a non-quote scalar,
* and we negate that. Whatever remains must be a 'scalar pseudo-structural character'.
*/
struct json_block {
public:
// We spell out the constructors in the hope of resolving inlining issues with Visual Studio 2017
simdjson_inline json_block(json_string_block&& string, json_character_block characters, uint64_t follows_potential_nonquote_scalar) :
_string(std::move(string)), _characters(characters), _follows_potential_nonquote_scalar(follows_potential_nonquote_scalar) {}
simdjson_inline json_block(json_string_block string, json_character_block characters, uint64_t follows_potential_nonquote_scalar) :
_string(string), _characters(characters), _follows_potential_nonquote_scalar(follows_potential_nonquote_scalar) {}
/**
* The start of structurals.
* In simdjson prior to v0.3, these were called the pseudo-structural characters.
**/
simdjson_inline uint64_t structural_start() const noexcept { return potential_structural_start() & ~_string.string_tail(); }
/** All JSON whitespace (i.e. not in a string) */
simdjson_inline uint64_t whitespace() const noexcept { return non_quote_outside_string(_characters.whitespace()); }
// Helpers
/** Whether the given characters are inside a string (only works on non-quotes) */
simdjson_inline uint64_t non_quote_inside_string(uint64_t mask) const noexcept { return _string.non_quote_inside_string(mask); }
/** Whether the given characters are outside a string (only works on non-quotes) */
simdjson_inline uint64_t non_quote_outside_string(uint64_t mask) const noexcept { return _string.non_quote_outside_string(mask); }
// string and escape characters
json_string_block _string;
// whitespace, structural characters ('operators'), scalars
json_character_block _characters;
// whether the previous character was a scalar
uint64_t _follows_potential_nonquote_scalar;
private:
// Potential structurals (i.e. disregarding strings)
/**
* structural elements ([,],{,},:, comma) plus scalar starts like 123, true and "abc".
* They may reside inside a string.
**/
simdjson_inline uint64_t potential_structural_start() const noexcept { return _characters.op() | potential_scalar_start(); }
/**
* The start of non-operator runs, like 123, true and "abc".
* It main reside inside a string.
**/
simdjson_inline uint64_t potential_scalar_start() const noexcept {
// The term "scalar" refers to anything except structural characters and white space
// (so letters, numbers, quotes).
// Whenever it is preceded by something that is not a structural element ({,},[,],:, ") nor a white-space
// then we know that it is irrelevant structurally.
return _characters.scalar() & ~follows_potential_scalar();
}
/**
* Whether the given character is immediately after a non-operator like 123, true.
* The characters following a quote are not included.
*/
simdjson_inline uint64_t follows_potential_scalar() const noexcept {
// _follows_potential_nonquote_scalar: is defined as marking any character that follows a character
// that is not a structural element ({,},[,],:, comma) nor a quote (") and that is not a
// white space.
// It is understood that within quoted region, anything at all could be marked (irrelevant).
return _follows_potential_nonquote_scalar;
}
};
/**
* Scans JSON for important bits: structural characters or 'operators', strings, and scalars.
*
* The scanner starts by calculating two distinct things:
* - string characters (taking \" into account)
* - structural characters or 'operators' ([]{},:, comma)
* and scalars (runs of non-operators like 123, true and "abc")
*
* To minimize data dependency (a key component of the scanner's speed), it finds these in parallel:
* in particular, the operator/scalar bit will find plenty of things that are actually part of
* strings. When we're done, json_block will fuse the two together by masking out tokens that are
* part of a string.
*/
class json_scanner {
public:
json_scanner() = default;
simdjson_inline json_block next(const simd::simd8x64<uint8_t>& in);
// Returns either UNCLOSED_STRING or SUCCESS
simdjson_inline error_code finish();
private:
// Whether the last character of the previous iteration is part of a scalar token
// (anything except whitespace or a structural character/'operator').
uint64_t prev_scalar = 0ULL;
json_string_scanner string_scanner{};
};
//
// Check if the current character immediately follows a matching character.
//
// For example, this checks for quotes with backslashes in front of them:
//
// const uint64_t backslashed_quote = in.eq('"') & immediately_follows(in.eq('\'), prev_backslash);
//
simdjson_inline uint64_t follows(const uint64_t match, uint64_t &overflow) {
const uint64_t result = match << 1 | overflow;
overflow = match >> 63;
return result;
}
simdjson_inline json_block json_scanner::next(const simd::simd8x64<uint8_t>& in) {
json_string_block strings = string_scanner.next(in);
// identifies the white-space and the structural characters
json_character_block characters = json_character_block::classify(in);
// The term "scalar" refers to anything except structural characters and white space
// (so letters, numbers, quotes).
// We want follows_scalar to mark anything that follows a non-quote scalar (so letters and numbers).
//
// A terminal quote should either be followed by a structural character (comma, brace, bracket, colon)
// or nothing. However, we still want ' "a string"true ' to mark the 't' of 'true' as a potential
// pseudo-structural character just like we would if we had ' "a string" true '; otherwise we
// may need to add an extra check when parsing strings.
//
// Performance: there are many ways to skin this cat.
const uint64_t nonquote_scalar = characters.scalar() & ~strings.quote();
uint64_t follows_nonquote_scalar = follows(nonquote_scalar, prev_scalar);
// We are returning a function-local object so either we get a move constructor
// or we get copy elision.
return json_block(
strings,// strings is a function-local object so either it moves or the copy is elided.
characters,
follows_nonquote_scalar
);
}
simdjson_inline error_code json_scanner::finish() {
return string_scanner.finish();
}
} // namespace stage1
} // unnamed namespace
} // namespace haswell
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE1_JSON_SCANNER_H
/* end file generic/stage1/json_scanner.h for haswell */
// All other declarations
/* including generic/stage1/find_next_document_index.h for haswell: #include <generic/stage1/find_next_document_index.h> */
/* begin file generic/stage1/find_next_document_index.h for haswell */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_FIND_NEXT_DOCUMENT_INDEX_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_FIND_NEXT_DOCUMENT_INDEX_H */
/* amalgamation skipped (editor-only): #include <generic/stage1/base.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/dom_parser_implementation.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace haswell {
namespace {
namespace stage1 {
/**
* This algorithm is used to quickly identify the last structural position that
* makes up a complete document.
*
* It does this by going backwards and finding the last *document boundary* (a
* place where one value follows another without a comma between them). If the
* last document (the characters after the boundary) has an equal number of
* start and end brackets, it is considered complete.
*
* Simply put, we iterate over the structural characters, starting from
* the end. We consider that we found the end of a JSON document when the
* first element of the pair is NOT one of these characters: '{' '[' ':' ','
* and when the second element is NOT one of these characters: '}' ']' ':' ','.
*
* This simple comparison works most of the time, but it does not cover cases
* where the batch's structural indexes contain a perfect amount of documents.
* In such a case, we do not have access to the structural index which follows
* the last document, therefore, we do not have access to the second element in
* the pair, and that means we cannot identify the last document. To fix this
* issue, we keep a count of the open and closed curly/square braces we found
* while searching for the pair. When we find a pair AND the count of open and
* closed curly/square braces is the same, we know that we just passed a
* complete document, therefore the last json buffer location is the end of the
* batch.
*/
simdjson_inline uint32_t find_next_document_index(dom_parser_implementation &parser) {
// Variant: do not count separately, just figure out depth
if(parser.n_structural_indexes == 0) { return 0; }
auto arr_cnt = 0;
auto obj_cnt = 0;
for (auto i = parser.n_structural_indexes - 1; i > 0; i--) {
auto idxb = parser.structural_indexes[i];
switch (parser.buf[idxb]) {
case ':':
case ',':
continue;
case '}':
obj_cnt--;
continue;
case ']':
arr_cnt--;
continue;
case '{':
obj_cnt++;
break;
case '[':
arr_cnt++;
break;
}
auto idxa = parser.structural_indexes[i - 1];
switch (parser.buf[idxa]) {
case '{':
case '[':
case ':':
case ',':
continue;
}
// Last document is complete, so the next document will appear after!
if (!arr_cnt && !obj_cnt) {
return parser.n_structural_indexes;
}
// Last document is incomplete; mark the document at i + 1 as the next one
return i;
}
// If we made it to the end, we want to finish counting to see if we have a full document.
switch (parser.buf[parser.structural_indexes[0]]) {
case '}':
obj_cnt--;
break;
case ']':
arr_cnt--;
break;
case '{':
obj_cnt++;
break;
case '[':
arr_cnt++;
break;
}
if (!arr_cnt && !obj_cnt) {
// We have a complete document.
return parser.n_structural_indexes;
}
return 0;
}
} // namespace stage1
} // unnamed namespace
} // namespace haswell
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE1_FIND_NEXT_DOCUMENT_INDEX_H
/* end file generic/stage1/find_next_document_index.h for haswell */
/* including generic/stage1/json_minifier.h for haswell: #include <generic/stage1/json_minifier.h> */
/* begin file generic/stage1/json_minifier.h for haswell */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_JSON_MINIFIER_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_JSON_MINIFIER_H */
/* amalgamation skipped (editor-only): #include <generic/stage1/base.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/json_scanner.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/buf_block_reader.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
// This file contains the common code every implementation uses in stage1
// It is intended to be included multiple times and compiled multiple times
// We assume the file in which it is included already includes
// "simdjson/stage1.h" (this simplifies amalgation)
namespace simdjson {
namespace haswell {
namespace {
namespace stage1 {
class json_minifier {
public:
template<size_t STEP_SIZE>
static error_code minify(const uint8_t *buf, size_t len, uint8_t *dst, size_t &dst_len) noexcept;
private:
simdjson_inline json_minifier(uint8_t *_dst)
: dst{_dst}
{}
template<size_t STEP_SIZE>
simdjson_inline void step(const uint8_t *block_buf, buf_block_reader<STEP_SIZE> &reader) noexcept;
simdjson_inline void next(const simd::simd8x64<uint8_t>& in, const json_block& block);
simdjson_inline error_code finish(uint8_t *dst_start, size_t &dst_len);
json_scanner scanner{};
uint8_t *dst;
};
simdjson_inline void json_minifier::next(const simd::simd8x64<uint8_t>& in, const json_block& block) {
uint64_t mask = block.whitespace();
dst += in.compress(mask, dst);
}
simdjson_inline error_code json_minifier::finish(uint8_t *dst_start, size_t &dst_len) {
error_code error = scanner.finish();
if (error) { dst_len = 0; return error; }
dst_len = dst - dst_start;
return SUCCESS;
}
template<>
simdjson_inline void json_minifier::step<128>(const uint8_t *block_buf, buf_block_reader<128> &reader) noexcept {
simd::simd8x64<uint8_t> in_1(block_buf);
simd::simd8x64<uint8_t> in_2(block_buf+64);
json_block block_1 = scanner.next(in_1);
json_block block_2 = scanner.next(in_2);
this->next(in_1, block_1);
this->next(in_2, block_2);
reader.advance();
}
template<>
simdjson_inline void json_minifier::step<64>(const uint8_t *block_buf, buf_block_reader<64> &reader) noexcept {
simd::simd8x64<uint8_t> in_1(block_buf);
json_block block_1 = scanner.next(in_1);
this->next(block_buf, block_1);
reader.advance();
}
template<size_t STEP_SIZE>
error_code json_minifier::minify(const uint8_t *buf, size_t len, uint8_t *dst, size_t &dst_len) noexcept {
buf_block_reader<STEP_SIZE> reader(buf, len);
json_minifier minifier(dst);
// Index the first n-1 blocks
while (reader.has_full_block()) {
minifier.step<STEP_SIZE>(reader.full_block(), reader);
}
// Index the last (remainder) block, padded with spaces
uint8_t block[STEP_SIZE];
size_t remaining_bytes = reader.get_remainder(block);
if (remaining_bytes > 0) {
// We do not want to write directly to the output stream. Rather, we write
// to a local buffer (for safety).
uint8_t out_block[STEP_SIZE];
uint8_t * const guarded_dst{minifier.dst};
minifier.dst = out_block;
minifier.step<STEP_SIZE>(block, reader);
size_t to_write = minifier.dst - out_block;
// In some cases, we could be enticed to consider the padded spaces
// as part of the string. This is fine as long as we do not write more
// than we consumed.
if(to_write > remaining_bytes) { to_write = remaining_bytes; }
memcpy(guarded_dst, out_block, to_write);
minifier.dst = guarded_dst + to_write;
}
return minifier.finish(dst, dst_len);
}
} // namespace stage1
} // unnamed namespace
} // namespace haswell
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE1_JSON_MINIFIER_H
/* end file generic/stage1/json_minifier.h for haswell */
/* including generic/stage1/json_structural_indexer.h for haswell: #include <generic/stage1/json_structural_indexer.h> */
/* begin file generic/stage1/json_structural_indexer.h for haswell */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_JSON_STRUCTURAL_INDEXER_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_JSON_STRUCTURAL_INDEXER_H */
/* amalgamation skipped (editor-only): #include <generic/stage1/base.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/utf8_lookup4_algorithm.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/buf_block_reader.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/json_string_scanner.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/json_scanner.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/json_minifier.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/find_next_document_index.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
// This file contains the common code every implementation uses in stage1
// It is intended to be included multiple times and compiled multiple times
// We assume the file in which it is included already includes
// "simdjson/stage1.h" (this simplifies amalgation)
namespace simdjson {
namespace haswell {
namespace {
namespace stage1 {
class bit_indexer {
public:
uint32_t *tail;
simdjson_inline bit_indexer(uint32_t *index_buf) : tail(index_buf) {}
#if SIMDJSON_PREFER_REVERSE_BITS
/**
* ARM lacks a fast trailing zero instruction, but it has a fast
* bit reversal instruction and a fast leading zero instruction.
* Thus it may be profitable to reverse the bits (once) and then
* to rely on a sequence of instructions that call the leading
* zero instruction.
*
* Performance notes:
* The chosen routine is not optimal in terms of data dependency
* since zero_leading_bit might require two instructions. However,
* it tends to minimize the total number of instructions which is
* beneficial.
*/
simdjson_inline void write_index(uint32_t idx, uint64_t& rev_bits, int i) {
int lz = leading_zeroes(rev_bits);
this->tail[i] = static_cast<uint32_t>(idx) + lz;
rev_bits = zero_leading_bit(rev_bits, lz);
}
#else
/**
* Under recent x64 systems, we often have both a fast trailing zero
* instruction and a fast 'clear-lower-bit' instruction so the following
* algorithm can be competitive.
*/
simdjson_inline void write_index(uint32_t idx, uint64_t& bits, int i) {
this->tail[i] = idx + trailing_zeroes(bits);
bits = clear_lowest_bit(bits);
}
#endif // SIMDJSON_PREFER_REVERSE_BITS
template <int START, int N>
simdjson_inline int write_indexes(uint32_t idx, uint64_t& bits) {
write_index(idx, bits, START);
SIMDJSON_IF_CONSTEXPR (N > 1) {
write_indexes<(N-1>0?START+1:START), (N-1>=0?N-1:1)>(idx, bits);
}
return START+N;
}
template <int START, int END, int STEP>
simdjson_inline int write_indexes_stepped(uint32_t idx, uint64_t& bits, int cnt) {
write_indexes<START, STEP>(idx, bits);
SIMDJSON_IF_CONSTEXPR ((START+STEP) < END) {
if (simdjson_unlikely((START+STEP) < cnt)) {
write_indexes_stepped<(START+STEP<END?START+STEP:END), END, STEP>(idx, bits, cnt);
}
}
return ((END-START) % STEP) == 0 ? END : (END-START) - ((END-START) % STEP) + STEP;
}
// flatten out values in 'bits' assuming that they are are to have values of idx
// plus their position in the bitvector, and store these indexes at
// base_ptr[base] incrementing base as we go
// will potentially store extra values beyond end of valid bits, so base_ptr
// needs to be large enough to handle this
//
// If the kernel sets SIMDJSON_GENERIC_JSON_STRUCTURAL_INDEXER_CUSTOM_BIT_INDEXER, then it
// will provide its own version of the code.
#ifdef SIMDJSON_GENERIC_JSON_STRUCTURAL_INDEXER_CUSTOM_BIT_INDEXER
simdjson_inline void write(uint32_t idx, uint64_t bits);
#else
simdjson_inline void write(uint32_t idx, uint64_t bits) {
// In some instances, the next branch is expensive because it is mispredicted.
// Unfortunately, in other cases,
// it helps tremendously.
if (bits == 0)
return;
int cnt = static_cast<int>(count_ones(bits));
#if SIMDJSON_PREFER_REVERSE_BITS
bits = reverse_bits(bits);
#endif
#ifdef SIMDJSON_STRUCTURAL_INDEXER_STEP
static constexpr const int STEP = SIMDJSON_STRUCTURAL_INDEXER_STEP;
#else
static constexpr const int STEP = 4;
#endif
static constexpr const int STEP_UNTIL = 24;
write_indexes_stepped<0, STEP_UNTIL, STEP>(idx, bits, cnt);
SIMDJSON_IF_CONSTEXPR (STEP_UNTIL < 64) {
if (simdjson_unlikely(STEP_UNTIL < cnt)) {
for (int i=STEP_UNTIL; i<cnt; i++) {
write_index(idx, bits, i);
}
}
}
this->tail += cnt;
}
#endif // SIMDJSON_GENERIC_JSON_STRUCTURAL_INDEXER_CUSTOM_BIT_INDEXER
};
class json_structural_indexer {
public:
/**
* Find the important bits of JSON in a 128-byte chunk, and add them to structural_indexes.
*
* @param partial Setting the partial parameter to true allows the find_structural_bits to
* tolerate unclosed strings. The caller should still ensure that the input is valid UTF-8. If
* you are processing substrings, you may want to call on a function like trimmed_length_safe_utf8.
*/
template<size_t STEP_SIZE>
static error_code index(const uint8_t *buf, size_t len, dom_parser_implementation &parser, stage1_mode partial) noexcept;
private:
simdjson_inline json_structural_indexer(uint32_t *structural_indexes);
template<size_t STEP_SIZE>
simdjson_inline void step(const uint8_t *block, buf_block_reader<STEP_SIZE> &reader) noexcept;
simdjson_inline void next(const simd::simd8x64<uint8_t>& in, const json_block& block, size_t idx);
simdjson_inline error_code finish(dom_parser_implementation &parser, size_t idx, size_t len, stage1_mode partial);
json_scanner scanner{};
utf8_checker checker{};
bit_indexer indexer;
uint64_t prev_structurals = 0;
uint64_t unescaped_chars_error = 0;
};
simdjson_inline json_structural_indexer::json_structural_indexer(uint32_t *structural_indexes) : indexer{structural_indexes} {}
// Skip the last character if it is partial
simdjson_inline size_t trim_partial_utf8(const uint8_t *buf, size_t len) {
if (simdjson_unlikely(len < 3)) {
switch (len) {
case 2:
if (buf[len-1] >= 0xc0) { return len-1; } // 2-, 3- and 4-byte characters with only 1 byte left
if (buf[len-2] >= 0xe0) { return len-2; } // 3- and 4-byte characters with only 2 bytes left
return len;
case 1:
if (buf[len-1] >= 0xc0) { return len-1; } // 2-, 3- and 4-byte characters with only 1 byte left
return len;
case 0:
return len;
}
}
if (buf[len-1] >= 0xc0) { return len-1; } // 2-, 3- and 4-byte characters with only 1 byte left
if (buf[len-2] >= 0xe0) { return len-2; } // 3- and 4-byte characters with only 1 byte left
if (buf[len-3] >= 0xf0) { return len-3; } // 4-byte characters with only 3 bytes left
return len;
}
//
// PERF NOTES:
// We pipe 2 inputs through these stages:
// 1. Load JSON into registers. This takes a long time and is highly parallelizable, so we load
// 2 inputs' worth at once so that by the time step 2 is looking for them input, it's available.
// 2. Scan the JSON for critical data: strings, scalars and operators. This is the critical path.
// The output of step 1 depends entirely on this information. These functions don't quite use
// up enough CPU: the second half of the functions is highly serial, only using 1 execution core
// at a time. The second input's scans has some dependency on the first ones finishing it, but
// they can make a lot of progress before they need that information.
// 3. Step 1 does not use enough capacity, so we run some extra stuff while we're waiting for that
// to finish: utf-8 checks and generating the output from the last iteration.
//
// The reason we run 2 inputs at a time, is steps 2 and 3 are *still* not enough to soak up all
// available capacity with just one input. Running 2 at a time seems to give the CPU a good enough
// workout.
//
template<size_t STEP_SIZE>
error_code json_structural_indexer::index(const uint8_t *buf, size_t len, dom_parser_implementation &parser, stage1_mode partial) noexcept {
if (simdjson_unlikely(len > parser.capacity())) { return CAPACITY; }
// We guard the rest of the code so that we can assume that len > 0 throughout.
if (len == 0) { return EMPTY; }
if (is_streaming(partial)) {
len = trim_partial_utf8(buf, len);
// If you end up with an empty window after trimming
// the partial UTF-8 bytes, then chances are good that you
// have an UTF-8 formatting error.
if(len == 0) { return UTF8_ERROR; }
}
buf_block_reader<STEP_SIZE> reader(buf, len);
json_structural_indexer indexer(parser.structural_indexes.get());
// Read all but the last block
while (reader.has_full_block()) {
indexer.step<STEP_SIZE>(reader.full_block(), reader);
}
// Take care of the last block (will always be there unless file is empty which is
// not supposed to happen.)
uint8_t block[STEP_SIZE];
if (simdjson_unlikely(reader.get_remainder(block) == 0)) { return UNEXPECTED_ERROR; }
indexer.step<STEP_SIZE>(block, reader);
return indexer.finish(parser, reader.block_index(), len, partial);
}
template<>
simdjson_inline void json_structural_indexer::step<128>(const uint8_t *block, buf_block_reader<128> &reader) noexcept {
simd::simd8x64<uint8_t> in_1(block);
simd::simd8x64<uint8_t> in_2(block+64);
json_block block_1 = scanner.next(in_1);
json_block block_2 = scanner.next(in_2);
this->next(in_1, block_1, reader.block_index());
this->next(in_2, block_2, reader.block_index()+64);
reader.advance();
}
template<>
simdjson_inline void json_structural_indexer::step<64>(const uint8_t *block, buf_block_reader<64> &reader) noexcept {
simd::simd8x64<uint8_t> in_1(block);
json_block block_1 = scanner.next(in_1);
this->next(in_1, block_1, reader.block_index());
reader.advance();
}
simdjson_inline void json_structural_indexer::next(const simd::simd8x64<uint8_t>& in, const json_block& block, size_t idx) {
uint64_t unescaped = in.lteq(0x1F);
#if SIMDJSON_UTF8VALIDATION
checker.check_next_input(in);
#endif
indexer.write(uint32_t(idx-64), prev_structurals); // Output *last* iteration's structurals to the parser
prev_structurals = block.structural_start();
unescaped_chars_error |= block.non_quote_inside_string(unescaped);
}
simdjson_inline error_code json_structural_indexer::finish(dom_parser_implementation &parser, size_t idx, size_t len, stage1_mode partial) {
// Write out the final iteration's structurals
indexer.write(uint32_t(idx-64), prev_structurals);
error_code error = scanner.finish();
// We deliberately break down the next expression so that it is
// human readable.
const bool should_we_exit = is_streaming(partial) ?
((error != SUCCESS) && (error != UNCLOSED_STRING)) // when partial we tolerate UNCLOSED_STRING
: (error != SUCCESS); // if partial is false, we must have SUCCESS
const bool have_unclosed_string = (error == UNCLOSED_STRING);
if (simdjson_unlikely(should_we_exit)) { return error; }
if (unescaped_chars_error) {
return UNESCAPED_CHARS;
}
parser.n_structural_indexes = uint32_t(indexer.tail - parser.structural_indexes.get());
/***
* The On Demand API requires special padding.
*
* This is related to https://github.com/simdjson/simdjson/issues/906
* Basically, we want to make sure that if the parsing continues beyond the last (valid)
* structural character, it quickly stops.
* Only three structural characters can be repeated without triggering an error in JSON: [,] and }.
* We repeat the padding character (at 'len'). We don't know what it is, but if the parsing
* continues, then it must be [,] or }.
* Suppose it is ] or }. We backtrack to the first character, what could it be that would
* not trigger an error? It could be ] or } but no, because you can't start a document that way.
* It can't be a comma, a colon or any simple value. So the only way we could continue is
* if the repeated character is [. But if so, the document must start with [. But if the document
* starts with [, it should end with ]. If we enforce that rule, then we would get
* ][[ which is invalid.
*
* This is illustrated with the test array_iterate_unclosed_error() on the following input:
* R"({ "a": [,,)"
**/
parser.structural_indexes[parser.n_structural_indexes] = uint32_t(len); // used later in partial == stage1_mode::streaming_final
parser.structural_indexes[parser.n_structural_indexes + 1] = uint32_t(len);
parser.structural_indexes[parser.n_structural_indexes + 2] = 0;
parser.next_structural_index = 0;
// a valid JSON file cannot have zero structural indexes - we should have found something
if (simdjson_unlikely(parser.n_structural_indexes == 0u)) {
return EMPTY;
}
if (simdjson_unlikely(parser.structural_indexes[parser.n_structural_indexes - 1] > len)) {
return UNEXPECTED_ERROR;
}
if (partial == stage1_mode::streaming_partial) {
// If we have an unclosed string, then the last structural
// will be the quote and we want to make sure to omit it.
if(have_unclosed_string) {
parser.n_structural_indexes--;
// a valid JSON file cannot have zero structural indexes - we should have found something
if (simdjson_unlikely(parser.n_structural_indexes == 0u)) { return CAPACITY; }
}
// We truncate the input to the end of the last complete document (or zero).
auto new_structural_indexes = find_next_document_index(parser);
if (new_structural_indexes == 0 && parser.n_structural_indexes > 0) {
if(parser.structural_indexes[0] == 0) {
// If the buffer is partial and we started at index 0 but the document is
// incomplete, it's too big to parse.
return CAPACITY;
} else {
// It is possible that the document could be parsed, we just had a lot
// of white space.
parser.n_structural_indexes = 0;
return EMPTY;
}
}
parser.n_structural_indexes = new_structural_indexes;
} else if (partial == stage1_mode::streaming_final) {
if(have_unclosed_string) { parser.n_structural_indexes--; }
// We truncate the input to the end of the last complete document (or zero).
// Because partial == stage1_mode::streaming_final, it means that we may
// silently ignore trailing garbage. Though it sounds bad, we do it
// deliberately because many people who have streams of JSON documents
// will truncate them for processing. E.g., imagine that you are uncompressing
// the data from a size file or receiving it in chunks from the network. You
// may not know where exactly the last document will be. Meanwhile the
// document_stream instances allow people to know the JSON documents they are
// parsing (see the iterator.source() method).
parser.n_structural_indexes = find_next_document_index(parser);
// We store the initial n_structural_indexes so that the client can see
// whether we used truncation. If initial_n_structural_indexes == parser.n_structural_indexes,
// then this will query parser.structural_indexes[parser.n_structural_indexes] which is len,
// otherwise, it will copy some prior index.
parser.structural_indexes[parser.n_structural_indexes + 1] = parser.structural_indexes[parser.n_structural_indexes];
// This next line is critical, do not change it unless you understand what you are
// doing.
parser.structural_indexes[parser.n_structural_indexes] = uint32_t(len);
if (simdjson_unlikely(parser.n_structural_indexes == 0u)) {
// We tolerate an unclosed string at the very end of the stream. Indeed, users
// often load their data in bulk without being careful and they want us to ignore
// the trailing garbage.
return EMPTY;
}
}
checker.check_eof();
return checker.errors();
}
} // namespace stage1
} // unnamed namespace
} // namespace haswell
} // namespace simdjson
// Clear CUSTOM_BIT_INDEXER so other implementations can set it if they need to.
#undef SIMDJSON_GENERIC_JSON_STRUCTURAL_INDEXER_CUSTOM_BIT_INDEXER
#endif // SIMDJSON_SRC_GENERIC_STAGE1_JSON_STRUCTURAL_INDEXER_H
/* end file generic/stage1/json_structural_indexer.h for haswell */
/* including generic/stage1/utf8_validator.h for haswell: #include <generic/stage1/utf8_validator.h> */
/* begin file generic/stage1/utf8_validator.h for haswell */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_UTF8_VALIDATOR_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_UTF8_VALIDATOR_H */
/* amalgamation skipped (editor-only): #include <generic/stage1/base.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/buf_block_reader.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/utf8_lookup4_algorithm.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace haswell {
namespace {
namespace stage1 {
/**
* Validates that the string is actual UTF-8.
*/
template<class checker>
bool generic_validate_utf8(const uint8_t * input, size_t length) {
checker c{};
buf_block_reader<64> reader(input, length);
while (reader.has_full_block()) {
simd::simd8x64<uint8_t> in(reader.full_block());
c.check_next_input(in);
reader.advance();
}
uint8_t block[64]{};
reader.get_remainder(block);
simd::simd8x64<uint8_t> in(block);
c.check_next_input(in);
reader.advance();
c.check_eof();
return c.errors() == error_code::SUCCESS;
}
bool generic_validate_utf8(const char * input, size_t length) {
return generic_validate_utf8<utf8_checker>(reinterpret_cast<const uint8_t *>(input),length);
}
} // namespace stage1
} // unnamed namespace
} // namespace haswell
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE1_UTF8_VALIDATOR_H
/* end file generic/stage1/utf8_validator.h for haswell */
/* end file generic/stage1/amalgamated.h for haswell */
/* including generic/stage2/amalgamated.h for haswell: #include <generic/stage2/amalgamated.h> */
/* begin file generic/stage2/amalgamated.h for haswell */
// Stuff other things depend on
/* including generic/stage2/base.h for haswell: #include <generic/stage2/base.h> */
/* begin file generic/stage2/base.h for haswell */
#ifndef SIMDJSON_SRC_GENERIC_STAGE2_BASE_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE2_BASE_H */
/* amalgamation skipped (editor-only): #include <generic/base.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace haswell {
namespace {
namespace stage2 {
class json_iterator;
class structural_iterator;
struct tape_builder;
struct tape_writer;
} // namespace stage2
} // unnamed namespace
} // namespace haswell
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE2_BASE_H
/* end file generic/stage2/base.h for haswell */
/* including generic/stage2/tape_writer.h for haswell: #include <generic/stage2/tape_writer.h> */
/* begin file generic/stage2/tape_writer.h for haswell */
#ifndef SIMDJSON_SRC_GENERIC_STAGE2_TAPE_WRITER_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE2_TAPE_WRITER_H */
/* amalgamation skipped (editor-only): #include <generic/stage2/base.h> */
/* amalgamation skipped (editor-only): #include <simdjson/internal/tape_type.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#include <cstring>
namespace simdjson {
namespace haswell {
namespace {
namespace stage2 {
struct tape_writer {
/** The next place to write to tape */
uint64_t *next_tape_loc;
/** Write a signed 64-bit value to tape. */
simdjson_inline void append_s64(int64_t value) noexcept;
/** Write an unsigned 64-bit value to tape. */
simdjson_inline void append_u64(uint64_t value) noexcept;
/** Write a double value to tape. */
simdjson_inline void append_double(double value) noexcept;
/**
* Append a tape entry (an 8-bit type,and 56 bits worth of value).
*/
simdjson_inline void append(uint64_t val, internal::tape_type t) noexcept;
/**
* Skip the current tape entry without writing.
*
* Used to skip the start of the container, since we'll come back later to fill it in when the
* container ends.
*/
simdjson_inline void skip() noexcept;
/**
* Skip the number of tape entries necessary to write a large u64 or i64.
*/
simdjson_inline void skip_large_integer() noexcept;
/**
* Skip the number of tape entries necessary to write a double.
*/
simdjson_inline void skip_double() noexcept;
/**
* Write a value to a known location on tape.
*
* Used to go back and write out the start of a container after the container ends.
*/
simdjson_inline static void write(uint64_t &tape_loc, uint64_t val, internal::tape_type t) noexcept;
private:
/**
* Append both the tape entry, and a supplementary value following it. Used for types that need
* all 64 bits, such as double and uint64_t.
*/
template<typename T>
simdjson_inline void append2(uint64_t val, T val2, internal::tape_type t) noexcept;
}; // struct tape_writer
simdjson_inline void tape_writer::append_s64(int64_t value) noexcept {
append2(0, value, internal::tape_type::INT64);
}
simdjson_inline void tape_writer::append_u64(uint64_t value) noexcept {
append(0, internal::tape_type::UINT64);
*next_tape_loc = value;
next_tape_loc++;
}
/** Write a double value to tape. */
simdjson_inline void tape_writer::append_double(double value) noexcept {
append2(0, value, internal::tape_type::DOUBLE);
}
simdjson_inline void tape_writer::skip() noexcept {
next_tape_loc++;
}
simdjson_inline void tape_writer::skip_large_integer() noexcept {
next_tape_loc += 2;
}
simdjson_inline void tape_writer::skip_double() noexcept {
next_tape_loc += 2;
}
simdjson_inline void tape_writer::append(uint64_t val, internal::tape_type t) noexcept {
*next_tape_loc = val | ((uint64_t(char(t))) << 56);
next_tape_loc++;
}
template<typename T>
simdjson_inline void tape_writer::append2(uint64_t val, T val2, internal::tape_type t) noexcept {
append(val, t);
static_assert(sizeof(val2) == sizeof(*next_tape_loc), "Type is not 64 bits!");
memcpy(next_tape_loc, &val2, sizeof(val2));
next_tape_loc++;
}
simdjson_inline void tape_writer::write(uint64_t &tape_loc, uint64_t val, internal::tape_type t) noexcept {
tape_loc = val | ((uint64_t(char(t))) << 56);
}
} // namespace stage2
} // unnamed namespace
} // namespace haswell
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE2_TAPE_WRITER_H
/* end file generic/stage2/tape_writer.h for haswell */
/* including generic/stage2/logger.h for haswell: #include <generic/stage2/logger.h> */
/* begin file generic/stage2/logger.h for haswell */
#ifndef SIMDJSON_SRC_GENERIC_STAGE2_LOGGER_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE2_LOGGER_H */
/* amalgamation skipped (editor-only): #include <generic/stage2/base.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#include <cstring>
// This is for an internal-only stage 2 specific logger.
// Set LOG_ENABLED = true to log what stage 2 is doing!
namespace simdjson {
namespace haswell {
namespace {
namespace logger {
static constexpr const char * DASHES = "----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------";
#if SIMDJSON_VERBOSE_LOGGING
static constexpr const bool LOG_ENABLED = true;
#else
static constexpr const bool LOG_ENABLED = false;
#endif
static constexpr const int LOG_EVENT_LEN = 20;
static constexpr const int LOG_BUFFER_LEN = 30;
static constexpr const int LOG_SMALL_BUFFER_LEN = 10;
static constexpr const int LOG_INDEX_LEN = 5;
static int log_depth; // Not threadsafe. Log only.
// Helper to turn unprintable or newline characters into spaces
static simdjson_inline char printable_char(char c) {
if (c >= 0x20) {
return c;
} else {
return ' ';
}
}
// Print the header and set up log_start
static simdjson_inline void log_start() {
if (LOG_ENABLED) {
log_depth = 0;
printf("\n");
printf("| %-*s | %-*s | %-*s | %-*s | Detail |\n", LOG_EVENT_LEN, "Event", LOG_BUFFER_LEN, "Buffer", LOG_SMALL_BUFFER_LEN, "Next", 5, "Next#");
printf("|%.*s|%.*s|%.*s|%.*s|--------|\n", LOG_EVENT_LEN+2, DASHES, LOG_BUFFER_LEN+2, DASHES, LOG_SMALL_BUFFER_LEN+2, DASHES, 5+2, DASHES);
}
}
simdjson_unused static simdjson_inline void log_string(const char *message) {
if (LOG_ENABLED) {
printf("%s\n", message);
}
}
// Logs a single line from the stage 2 DOM parser
template<typename S>
static simdjson_inline void log_line(S &structurals, const char *title_prefix, const char *title, const char *detail) {
if (LOG_ENABLED) {
printf("| %*s%s%-*s ", log_depth*2, "", title_prefix, LOG_EVENT_LEN - log_depth*2 - int(strlen(title_prefix)), title);
auto current_index = structurals.at_beginning() ? nullptr : structurals.next_structural-1;
auto next_index = structurals.next_structural;
auto current = current_index ? &structurals.buf[*current_index] : reinterpret_cast<const uint8_t*>(" ");
auto next = &structurals.buf[*next_index];
{
// Print the next N characters in the buffer.
printf("| ");
// Otherwise, print the characters starting from the buffer position.
// Print spaces for unprintable or newline characters.
for (int i=0;i<LOG_BUFFER_LEN;i++) {
printf("%c", printable_char(current[i]));
}
printf(" ");
// Print the next N characters in the buffer.
printf("| ");
// Otherwise, print the characters starting from the buffer position.
// Print spaces for unprintable or newline characters.
for (int i=0;i<LOG_SMALL_BUFFER_LEN;i++) {
printf("%c", printable_char(next[i]));
}
printf(" ");
}
if (current_index) {
printf("| %*u ", LOG_INDEX_LEN, *current_index);
} else {
printf("| %-*s ", LOG_INDEX_LEN, "");
}
// printf("| %*u ", LOG_INDEX_LEN, structurals.next_tape_index());
printf("| %-s ", detail);
printf("|\n");
}
}
} // namespace logger
} // unnamed namespace
} // namespace haswell
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE2_LOGGER_H
/* end file generic/stage2/logger.h for haswell */
// All other declarations
/* including generic/stage2/json_iterator.h for haswell: #include <generic/stage2/json_iterator.h> */
/* begin file generic/stage2/json_iterator.h for haswell */
#ifndef SIMDJSON_SRC_GENERIC_STAGE2_JSON_ITERATOR_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE2_JSON_ITERATOR_H */
/* amalgamation skipped (editor-only): #include <generic/stage2/base.h> */
/* amalgamation skipped (editor-only): #include <generic/stage2/logger.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/dom_parser_implementation.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace haswell {
namespace {
namespace stage2 {
class json_iterator {
public:
const uint8_t* const buf;
uint32_t *next_structural;
dom_parser_implementation &dom_parser;
uint32_t depth{0};
/**
* Walk the JSON document.
*
* The visitor receives callbacks when values are encountered. All callbacks pass the iterator as
* the first parameter; some callbacks have other parameters as well:
*
* - visit_document_start() - at the beginning.
* - visit_document_end() - at the end (if things were successful).
*
* - visit_array_start() - at the start `[` of a non-empty array.
* - visit_array_end() - at the end `]` of a non-empty array.
* - visit_empty_array() - when an empty array is encountered.
*
* - visit_object_end() - at the start `]` of a non-empty object.
* - visit_object_start() - at the end `]` of a non-empty object.
* - visit_empty_object() - when an empty object is encountered.
* - visit_key(const uint8_t *key) - when a key in an object field is encountered. key is
* guaranteed to point at the first quote of the string (`"key"`).
* - visit_primitive(const uint8_t *value) - when a value is a string, number, boolean or null.
* - visit_root_primitive(iter, uint8_t *value) - when the top-level value is a string, number, boolean or null.
*
* - increment_count(iter) - each time a value is found in an array or object.
*/
template<bool STREAMING, typename V>
simdjson_warn_unused simdjson_inline error_code walk_document(V &visitor) noexcept;
/**
* Create an iterator capable of walking a JSON document.
*
* The document must have already passed through stage 1.
*/
simdjson_inline json_iterator(dom_parser_implementation &_dom_parser, size_t start_structural_index);
/**
* Look at the next token.
*
* Tokens can be strings, numbers, booleans, null, or operators (`[{]},:`)).
*
* They may include invalid JSON as well (such as `1.2.3` or `ture`).
*/
simdjson_inline const uint8_t *peek() const noexcept;
/**
* Advance to the next token.
*
* Tokens can be strings, numbers, booleans, null, or operators (`[{]},:`)).
*
* They may include invalid JSON as well (such as `1.2.3` or `ture`).
*/
simdjson_inline const uint8_t *advance() noexcept;
/**
* Get the remaining length of the document, from the start of the current token.
*/
simdjson_inline size_t remaining_len() const noexcept;
/**
* Check if we are at the end of the document.
*
* If this is true, there are no more tokens.
*/
simdjson_inline bool at_eof() const noexcept;
/**
* Check if we are at the beginning of the document.
*/
simdjson_inline bool at_beginning() const noexcept;
simdjson_inline uint8_t last_structural() const noexcept;
/**
* Log that a value has been found.
*
* Set LOG_ENABLED=true in logger.h to see logging.
*/
simdjson_inline void log_value(const char *type) const noexcept;
/**
* Log the start of a multipart value.
*
* Set LOG_ENABLED=true in logger.h to see logging.
*/
simdjson_inline void log_start_value(const char *type) const noexcept;
/**
* Log the end of a multipart value.
*
* Set LOG_ENABLED=true in logger.h to see logging.
*/
simdjson_inline void log_end_value(const char *type) const noexcept;
/**
* Log an error.
*
* Set LOG_ENABLED=true in logger.h to see logging.
*/
simdjson_inline void log_error(const char *error) const noexcept;
template<typename V>
simdjson_warn_unused simdjson_inline error_code visit_root_primitive(V &visitor, const uint8_t *value) noexcept;
template<typename V>
simdjson_warn_unused simdjson_inline error_code visit_primitive(V &visitor, const uint8_t *value) noexcept;
};
template<bool STREAMING, typename V>
simdjson_warn_unused simdjson_inline error_code json_iterator::walk_document(V &visitor) noexcept {
logger::log_start();
//
// Start the document
//
if (at_eof()) { return EMPTY; }
log_start_value("document");
SIMDJSON_TRY( visitor.visit_document_start(*this) );
//
// Read first value
//
{
auto value = advance();
// Make sure the outer object or array is closed before continuing; otherwise, there are ways we
// could get into memory corruption. See https://github.com/simdjson/simdjson/issues/906
if (!STREAMING) {
switch (*value) {
case '{': if (last_structural() != '}') { log_value("starting brace unmatched"); return TAPE_ERROR; }; break;
case '[': if (last_structural() != ']') { log_value("starting bracket unmatched"); return TAPE_ERROR; }; break;
}
}
switch (*value) {
case '{': if (*peek() == '}') { advance(); log_value("empty object"); SIMDJSON_TRY( visitor.visit_empty_object(*this) ); break; } goto object_begin;
case '[': if (*peek() == ']') { advance(); log_value("empty array"); SIMDJSON_TRY( visitor.visit_empty_array(*this) ); break; } goto array_begin;
default: SIMDJSON_TRY( visitor.visit_root_primitive(*this, value) ); break;
}
}
goto document_end;
//
// Object parser states
//
object_begin:
log_start_value("object");
depth++;
if (depth >= dom_parser.max_depth()) { log_error("Exceeded max depth!"); return DEPTH_ERROR; }
dom_parser.is_array[depth] = false;
SIMDJSON_TRY( visitor.visit_object_start(*this) );
{
auto key = advance();
if (*key != '"') { log_error("Object does not start with a key"); return TAPE_ERROR; }
SIMDJSON_TRY( visitor.increment_count(*this) );
SIMDJSON_TRY( visitor.visit_key(*this, key) );
}
object_field:
if (simdjson_unlikely( *advance() != ':' )) { log_error("Missing colon after key in object"); return TAPE_ERROR; }
{
auto value = advance();
switch (*value) {
case '{': if (*peek() == '}') { advance(); log_value("empty object"); SIMDJSON_TRY( visitor.visit_empty_object(*this) ); break; } goto object_begin;
case '[': if (*peek() == ']') { advance(); log_value("empty array"); SIMDJSON_TRY( visitor.visit_empty_array(*this) ); break; } goto array_begin;
default: SIMDJSON_TRY( visitor.visit_primitive(*this, value) ); break;
}
}
object_continue:
switch (*advance()) {
case ',':
SIMDJSON_TRY( visitor.increment_count(*this) );
{
auto key = advance();
if (simdjson_unlikely( *key != '"' )) { log_error("Key string missing at beginning of field in object"); return TAPE_ERROR; }
SIMDJSON_TRY( visitor.visit_key(*this, key) );
}
goto object_field;
case '}': log_end_value("object"); SIMDJSON_TRY( visitor.visit_object_end(*this) ); goto scope_end;
default: log_error("No comma between object fields"); return TAPE_ERROR;
}
scope_end:
depth--;
if (depth == 0) { goto document_end; }
if (dom_parser.is_array[depth]) { goto array_continue; }
goto object_continue;
//
// Array parser states
//
array_begin:
log_start_value("array");
depth++;
if (depth >= dom_parser.max_depth()) { log_error("Exceeded max depth!"); return DEPTH_ERROR; }
dom_parser.is_array[depth] = true;
SIMDJSON_TRY( visitor.visit_array_start(*this) );
SIMDJSON_TRY( visitor.increment_count(*this) );
array_value:
{
auto value = advance();
switch (*value) {
case '{': if (*peek() == '}') { advance(); log_value("empty object"); SIMDJSON_TRY( visitor.visit_empty_object(*this) ); break; } goto object_begin;
case '[': if (*peek() == ']') { advance(); log_value("empty array"); SIMDJSON_TRY( visitor.visit_empty_array(*this) ); break; } goto array_begin;
default: SIMDJSON_TRY( visitor.visit_primitive(*this, value) ); break;
}
}
array_continue:
switch (*advance()) {
case ',': SIMDJSON_TRY( visitor.increment_count(*this) ); goto array_value;
case ']': log_end_value("array"); SIMDJSON_TRY( visitor.visit_array_end(*this) ); goto scope_end;
default: log_error("Missing comma between array values"); return TAPE_ERROR;
}
document_end:
log_end_value("document");
SIMDJSON_TRY( visitor.visit_document_end(*this) );
dom_parser.next_structural_index = uint32_t(next_structural - &dom_parser.structural_indexes[0]);
// If we didn't make it to the end, it's an error
if ( !STREAMING && dom_parser.next_structural_index != dom_parser.n_structural_indexes ) {
log_error("More than one JSON value at the root of the document, or extra characters at the end of the JSON!");
return TAPE_ERROR;
}
return SUCCESS;
} // walk_document()
simdjson_inline json_iterator::json_iterator(dom_parser_implementation &_dom_parser, size_t start_structural_index)
: buf{_dom_parser.buf},
next_structural{&_dom_parser.structural_indexes[start_structural_index]},
dom_parser{_dom_parser} {
}
simdjson_inline const uint8_t *json_iterator::peek() const noexcept {
return &buf[*(next_structural)];
}
simdjson_inline const uint8_t *json_iterator::advance() noexcept {
return &buf[*(next_structural++)];
}
simdjson_inline size_t json_iterator::remaining_len() const noexcept {
return dom_parser.len - *(next_structural-1);
}
simdjson_inline bool json_iterator::at_eof() const noexcept {
return next_structural == &dom_parser.structural_indexes[dom_parser.n_structural_indexes];
}
simdjson_inline bool json_iterator::at_beginning() const noexcept {
return next_structural == dom_parser.structural_indexes.get();
}
simdjson_inline uint8_t json_iterator::last_structural() const noexcept {
return buf[dom_parser.structural_indexes[dom_parser.n_structural_indexes - 1]];
}
simdjson_inline void json_iterator::log_value(const char *type) const noexcept {
logger::log_line(*this, "", type, "");
}
simdjson_inline void json_iterator::log_start_value(const char *type) const noexcept {
logger::log_line(*this, "+", type, "");
if (logger::LOG_ENABLED) { logger::log_depth++; }
}
simdjson_inline void json_iterator::log_end_value(const char *type) const noexcept {
if (logger::LOG_ENABLED) { logger::log_depth--; }
logger::log_line(*this, "-", type, "");
}
simdjson_inline void json_iterator::log_error(const char *error) const noexcept {
logger::log_line(*this, "", "ERROR", error);
}
template<typename V>
simdjson_warn_unused simdjson_inline error_code json_iterator::visit_root_primitive(V &visitor, const uint8_t *value) noexcept {
switch (*value) {
case '"': return visitor.visit_root_string(*this, value);
case 't': return visitor.visit_root_true_atom(*this, value);
case 'f': return visitor.visit_root_false_atom(*this, value);
case 'n': return visitor.visit_root_null_atom(*this, value);
case '-':
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
return visitor.visit_root_number(*this, value);
default:
log_error("Document starts with a non-value character");
return TAPE_ERROR;
}
}
template<typename V>
simdjson_warn_unused simdjson_inline error_code json_iterator::visit_primitive(V &visitor, const uint8_t *value) noexcept {
// Use the fact that most scalars are going to be either strings or numbers.
if(*value == '"') {
return visitor.visit_string(*this, value);
} else if (((*value - '0') < 10) || (*value == '-')) {
return visitor.visit_number(*this, value);
}
// true, false, null are uncommon.
switch (*value) {
case 't': return visitor.visit_true_atom(*this, value);
case 'f': return visitor.visit_false_atom(*this, value);
case 'n': return visitor.visit_null_atom(*this, value);
default:
log_error("Non-value found when value was expected!");
return TAPE_ERROR;
}
}
} // namespace stage2
} // unnamed namespace
} // namespace haswell
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE2_JSON_ITERATOR_H
/* end file generic/stage2/json_iterator.h for haswell */
/* including generic/stage2/stringparsing.h for haswell: #include <generic/stage2/stringparsing.h> */
/* begin file generic/stage2/stringparsing.h for haswell */
#ifndef SIMDJSON_SRC_GENERIC_STAGE2_STRINGPARSING_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE2_STRINGPARSING_H */
/* amalgamation skipped (editor-only): #include <generic/stage2/base.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/jsoncharutils.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
// This file contains the common code every implementation uses
// It is intended to be included multiple times and compiled multiple times
namespace simdjson {
namespace haswell {
namespace {
/// @private
namespace stringparsing {
// begin copypasta
// These chars yield themselves: " \ /
// b -> backspace, f -> formfeed, n -> newline, r -> cr, t -> horizontal tab
// u not handled in this table as it's complex
static const uint8_t escape_map[256] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x0.
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0x22, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x2f,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x4.
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x5c, 0, 0, 0, // 0x5.
0, 0, 0x08, 0, 0, 0, 0x0c, 0, 0, 0, 0, 0, 0, 0, 0x0a, 0, // 0x6.
0, 0, 0x0d, 0, 0x09, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x7.
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
};
// handle a unicode codepoint
// write appropriate values into dest
// src will advance 6 bytes or 12 bytes
// dest will advance a variable amount (return via pointer)
// return true if the unicode codepoint was valid
// We work in little-endian then swap at write time
simdjson_warn_unused
simdjson_inline bool handle_unicode_codepoint(const uint8_t **src_ptr,
uint8_t **dst_ptr, bool allow_replacement) {
// Use the default Unicode Character 'REPLACEMENT CHARACTER' (U+FFFD)
constexpr uint32_t substitution_code_point = 0xfffd;
// jsoncharutils::hex_to_u32_nocheck fills high 16 bits of the return value with 1s if the
// conversion is not valid; we defer the check for this to inside the
// multilingual plane check.
uint32_t code_point = jsoncharutils::hex_to_u32_nocheck(*src_ptr + 2);
*src_ptr += 6;
// If we found a high surrogate, we must
// check for low surrogate for characters
// outside the Basic
// Multilingual Plane.
if (code_point >= 0xd800 && code_point < 0xdc00) {
const uint8_t *src_data = *src_ptr;
/* Compiler optimizations convert this to a single 16-bit load and compare on most platforms */
if (((src_data[0] << 8) | src_data[1]) != ((static_cast<uint8_t> ('\\') << 8) | static_cast<uint8_t> ('u'))) {
if(!allow_replacement) { return false; }
code_point = substitution_code_point;
} else {
uint32_t code_point_2 = jsoncharutils::hex_to_u32_nocheck(src_data + 2);
// We have already checked that the high surrogate is valid and
// (code_point - 0xd800) < 1024.
//
// Check that code_point_2 is in the range 0xdc00..0xdfff
// and that code_point_2 was parsed from valid hex.
uint32_t low_bit = code_point_2 - 0xdc00;
if (low_bit >> 10) {
if(!allow_replacement) { return false; }
code_point = substitution_code_point;
} else {
code_point = (((code_point - 0xd800) << 10) | low_bit) + 0x10000;
*src_ptr += 6;
}
}
} else if (code_point >= 0xdc00 && code_point <= 0xdfff) {
// If we encounter a low surrogate (not preceded by a high surrogate)
// then we have an error.
if(!allow_replacement) { return false; }
code_point = substitution_code_point;
}
size_t offset = jsoncharutils::codepoint_to_utf8(code_point, *dst_ptr);
*dst_ptr += offset;
return offset > 0;
}
// handle a unicode codepoint using the wobbly convention
// https://simonsapin.github.io/wtf-8/
// write appropriate values into dest
// src will advance 6 bytes or 12 bytes
// dest will advance a variable amount (return via pointer)
// return true if the unicode codepoint was valid
// We work in little-endian then swap at write time
simdjson_warn_unused
simdjson_inline bool handle_unicode_codepoint_wobbly(const uint8_t **src_ptr,
uint8_t **dst_ptr) {
// It is not ideal that this function is nearly identical to handle_unicode_codepoint.
//
// jsoncharutils::hex_to_u32_nocheck fills high 16 bits of the return value with 1s if the
// conversion is not valid; we defer the check for this to inside the
// multilingual plane check.
uint32_t code_point = jsoncharutils::hex_to_u32_nocheck(*src_ptr + 2);
*src_ptr += 6;
// If we found a high surrogate, we must
// check for low surrogate for characters
// outside the Basic
// Multilingual Plane.
if (code_point >= 0xd800 && code_point < 0xdc00) {
const uint8_t *src_data = *src_ptr;
/* Compiler optimizations convert this to a single 16-bit load and compare on most platforms */
if (((src_data[0] << 8) | src_data[1]) == ((static_cast<uint8_t> ('\\') << 8) | static_cast<uint8_t> ('u'))) {
uint32_t code_point_2 = jsoncharutils::hex_to_u32_nocheck(src_data + 2);
uint32_t low_bit = code_point_2 - 0xdc00;
if ((low_bit >> 10) == 0) {
code_point =
(((code_point - 0xd800) << 10) | low_bit) + 0x10000;
*src_ptr += 6;
}
}
}
size_t offset = jsoncharutils::codepoint_to_utf8(code_point, *dst_ptr);
*dst_ptr += offset;
return offset > 0;
}
/**
* Unescape a valid UTF-8 string from src to dst, stopping at a final unescaped quote. There
* must be an unescaped quote terminating the string. It returns the final output
* position as pointer. In case of error (e.g., the string has bad escaped codes),
* then null_nullptrptr is returned. It is assumed that the output buffer is large
* enough. E.g., if src points at 'joe"', then dst needs to have four free bytes +
* SIMDJSON_PADDING bytes.
*/
simdjson_warn_unused simdjson_inline uint8_t *parse_string(const uint8_t *src, uint8_t *dst, bool allow_replacement) {
while (1) {
// Copy the next n bytes, and find the backslash and quote in them.
auto bs_quote = backslash_and_quote::copy_and_find(src, dst);
// If the next thing is the end quote, copy and return
if (bs_quote.has_quote_first()) {
// we encountered quotes first. Move dst to point to quotes and exit
return dst + bs_quote.quote_index();
}
if (bs_quote.has_backslash()) {
/* find out where the backspace is */
auto bs_dist = bs_quote.backslash_index();
uint8_t escape_char = src[bs_dist + 1];
/* we encountered backslash first. Handle backslash */
if (escape_char == 'u') {
/* move src/dst up to the start; they will be further adjusted
within the unicode codepoint handling code. */
src += bs_dist;
dst += bs_dist;
if (!handle_unicode_codepoint(&src, &dst, allow_replacement)) {
return nullptr;
}
} else {
/* simple 1:1 conversion. Will eat bs_dist+2 characters in input and
* write bs_dist+1 characters to output
* note this may reach beyond the part of the buffer we've actually
* seen. I think this is ok */
uint8_t escape_result = escape_map[escape_char];
if (escape_result == 0u) {
return nullptr; /* bogus escape value is an error */
}
dst[bs_dist] = escape_result;
src += bs_dist + 2;
dst += bs_dist + 1;
}
} else {
/* they are the same. Since they can't co-occur, it means we
* encountered neither. */
src += backslash_and_quote::BYTES_PROCESSED;
dst += backslash_and_quote::BYTES_PROCESSED;
}
}
}
simdjson_warn_unused simdjson_inline uint8_t *parse_wobbly_string(const uint8_t *src, uint8_t *dst) {
// It is not ideal that this function is nearly identical to parse_string.
while (1) {
// Copy the next n bytes, and find the backslash and quote in them.
auto bs_quote = backslash_and_quote::copy_and_find(src, dst);
// If the next thing is the end quote, copy and return
if (bs_quote.has_quote_first()) {
// we encountered quotes first. Move dst to point to quotes and exit
return dst + bs_quote.quote_index();
}
if (bs_quote.has_backslash()) {
/* find out where the backspace is */
auto bs_dist = bs_quote.backslash_index();
uint8_t escape_char = src[bs_dist + 1];
/* we encountered backslash first. Handle backslash */
if (escape_char == 'u') {
/* move src/dst up to the start; they will be further adjusted
within the unicode codepoint handling code. */
src += bs_dist;
dst += bs_dist;
if (!handle_unicode_codepoint_wobbly(&src, &dst)) {
return nullptr;
}
} else {
/* simple 1:1 conversion. Will eat bs_dist+2 characters in input and
* write bs_dist+1 characters to output
* note this may reach beyond the part of the buffer we've actually
* seen. I think this is ok */
uint8_t escape_result = escape_map[escape_char];
if (escape_result == 0u) {
return nullptr; /* bogus escape value is an error */
}
dst[bs_dist] = escape_result;
src += bs_dist + 2;
dst += bs_dist + 1;
}
} else {
/* they are the same. Since they can't co-occur, it means we
* encountered neither. */
src += backslash_and_quote::BYTES_PROCESSED;
dst += backslash_and_quote::BYTES_PROCESSED;
}
}
}
} // namespace stringparsing
} // unnamed namespace
} // namespace haswell
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE2_STRINGPARSING_H
/* end file generic/stage2/stringparsing.h for haswell */
/* including generic/stage2/structural_iterator.h for haswell: #include <generic/stage2/structural_iterator.h> */
/* begin file generic/stage2/structural_iterator.h for haswell */
#ifndef SIMDJSON_SRC_GENERIC_STAGE2_STRUCTURAL_ITERATOR_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE2_STRUCTURAL_ITERATOR_H */
/* amalgamation skipped (editor-only): #include <generic/stage2/base.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/dom_parser_implementation.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace haswell {
namespace {
namespace stage2 {
class structural_iterator {
public:
const uint8_t* const buf;
uint32_t *next_structural;
dom_parser_implementation &dom_parser;
// Start a structural
simdjson_inline structural_iterator(dom_parser_implementation &_dom_parser, size_t start_structural_index)
: buf{_dom_parser.buf},
next_structural{&_dom_parser.structural_indexes[start_structural_index]},
dom_parser{_dom_parser} {
}
// Get the buffer position of the current structural character
simdjson_inline const uint8_t* current() {
return &buf[*(next_structural-1)];
}
// Get the current structural character
simdjson_inline char current_char() {
return buf[*(next_structural-1)];
}
// Get the next structural character without advancing
simdjson_inline char peek_next_char() {
return buf[*next_structural];
}
simdjson_inline const uint8_t* peek() {
return &buf[*next_structural];
}
simdjson_inline const uint8_t* advance() {
return &buf[*(next_structural++)];
}
simdjson_inline char advance_char() {
return buf[*(next_structural++)];
}
simdjson_inline size_t remaining_len() {
return dom_parser.len - *(next_structural-1);
}
simdjson_inline bool at_end() {
return next_structural == &dom_parser.structural_indexes[dom_parser.n_structural_indexes];
}
simdjson_inline bool at_beginning() {
return next_structural == dom_parser.structural_indexes.get();
}
};
} // namespace stage2
} // unnamed namespace
} // namespace haswell
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE2_STRUCTURAL_ITERATOR_H
/* end file generic/stage2/structural_iterator.h for haswell */
/* including generic/stage2/tape_builder.h for haswell: #include <generic/stage2/tape_builder.h> */
/* begin file generic/stage2/tape_builder.h for haswell */
#ifndef SIMDJSON_SRC_GENERIC_STAGE2_TAPE_BUILDER_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE2_TAPE_BUILDER_H */
/* amalgamation skipped (editor-only): #include <generic/stage2/base.h> */
/* amalgamation skipped (editor-only): #include <generic/stage2/json_iterator.h> */
/* amalgamation skipped (editor-only): #include <generic/stage2/stringparsing.h> */
/* amalgamation skipped (editor-only): #include <generic/stage2/tape_writer.h> */
/* amalgamation skipped (editor-only): #include <simdjson/dom/document.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/atomparsing.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/dom_parser_implementation.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/numberparsing.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace haswell {
namespace {
namespace stage2 {
struct tape_builder {
template<bool STREAMING>
simdjson_warn_unused static simdjson_inline error_code parse_document(
dom_parser_implementation &dom_parser,
dom::document &doc) noexcept;
/** Called when a non-empty document starts. */
simdjson_warn_unused simdjson_inline error_code visit_document_start(json_iterator &iter) noexcept;
/** Called when a non-empty document ends without error. */
simdjson_warn_unused simdjson_inline error_code visit_document_end(json_iterator &iter) noexcept;
/** Called when a non-empty array starts. */
simdjson_warn_unused simdjson_inline error_code visit_array_start(json_iterator &iter) noexcept;
/** Called when a non-empty array ends. */
simdjson_warn_unused simdjson_inline error_code visit_array_end(json_iterator &iter) noexcept;
/** Called when an empty array is found. */
simdjson_warn_unused simdjson_inline error_code visit_empty_array(json_iterator &iter) noexcept;
/** Called when a non-empty object starts. */
simdjson_warn_unused simdjson_inline error_code visit_object_start(json_iterator &iter) noexcept;
/**
* Called when a key in a field is encountered.
*
* primitive, visit_object_start, visit_empty_object, visit_array_start, or visit_empty_array
* will be called after this with the field value.
*/
simdjson_warn_unused simdjson_inline error_code visit_key(json_iterator &iter, const uint8_t *key) noexcept;
/** Called when a non-empty object ends. */
simdjson_warn_unused simdjson_inline error_code visit_object_end(json_iterator &iter) noexcept;
/** Called when an empty object is found. */
simdjson_warn_unused simdjson_inline error_code visit_empty_object(json_iterator &iter) noexcept;
/**
* Called when a string, number, boolean or null is found.
*/
simdjson_warn_unused simdjson_inline error_code visit_primitive(json_iterator &iter, const uint8_t *value) noexcept;
/**
* Called when a string, number, boolean or null is found at the top level of a document (i.e.
* when there is no array or object and the entire document is a single string, number, boolean or
* null.
*
* This is separate from primitive() because simdjson's normal primitive parsing routines assume
* there is at least one more token after the value, which is only true in an array or object.
*/
simdjson_warn_unused simdjson_inline error_code visit_root_primitive(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_string(json_iterator &iter, const uint8_t *value, bool key = false) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_number(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_true_atom(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_false_atom(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_null_atom(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_root_string(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_root_number(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_root_true_atom(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_root_false_atom(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_root_null_atom(json_iterator &iter, const uint8_t *value) noexcept;
/** Called each time a new field or element in an array or object is found. */
simdjson_warn_unused simdjson_inline error_code increment_count(json_iterator &iter) noexcept;
/** Next location to write to tape */
tape_writer tape;
private:
/** Next write location in the string buf for stage 2 parsing */
uint8_t *current_string_buf_loc;
simdjson_inline tape_builder(dom::document &doc) noexcept;
simdjson_inline uint32_t next_tape_index(json_iterator &iter) const noexcept;
simdjson_inline void start_container(json_iterator &iter) noexcept;
simdjson_warn_unused simdjson_inline error_code end_container(json_iterator &iter, internal::tape_type start, internal::tape_type end) noexcept;
simdjson_warn_unused simdjson_inline error_code empty_container(json_iterator &iter, internal::tape_type start, internal::tape_type end) noexcept;
simdjson_inline uint8_t *on_start_string(json_iterator &iter) noexcept;
simdjson_inline void on_end_string(uint8_t *dst) noexcept;
}; // struct tape_builder
template<bool STREAMING>
simdjson_warn_unused simdjson_inline error_code tape_builder::parse_document(
dom_parser_implementation &dom_parser,
dom::document &doc) noexcept {
dom_parser.doc = &doc;
json_iterator iter(dom_parser, STREAMING ? dom_parser.next_structural_index : 0);
tape_builder builder(doc);
return iter.walk_document<STREAMING>(builder);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_root_primitive(json_iterator &iter, const uint8_t *value) noexcept {
return iter.visit_root_primitive(*this, value);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_primitive(json_iterator &iter, const uint8_t *value) noexcept {
return iter.visit_primitive(*this, value);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_empty_object(json_iterator &iter) noexcept {
return empty_container(iter, internal::tape_type::START_OBJECT, internal::tape_type::END_OBJECT);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_empty_array(json_iterator &iter) noexcept {
return empty_container(iter, internal::tape_type::START_ARRAY, internal::tape_type::END_ARRAY);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_document_start(json_iterator &iter) noexcept {
start_container(iter);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_object_start(json_iterator &iter) noexcept {
start_container(iter);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_array_start(json_iterator &iter) noexcept {
start_container(iter);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_object_end(json_iterator &iter) noexcept {
return end_container(iter, internal::tape_type::START_OBJECT, internal::tape_type::END_OBJECT);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_array_end(json_iterator &iter) noexcept {
return end_container(iter, internal::tape_type::START_ARRAY, internal::tape_type::END_ARRAY);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_document_end(json_iterator &iter) noexcept {
constexpr uint32_t start_tape_index = 0;
tape.append(start_tape_index, internal::tape_type::ROOT);
tape_writer::write(iter.dom_parser.doc->tape[start_tape_index], next_tape_index(iter), internal::tape_type::ROOT);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_key(json_iterator &iter, const uint8_t *key) noexcept {
return visit_string(iter, key, true);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::increment_count(json_iterator &iter) noexcept {
iter.dom_parser.open_containers[iter.depth].count++; // we have a key value pair in the object at parser.dom_parser.depth - 1
return SUCCESS;
}
simdjson_inline tape_builder::tape_builder(dom::document &doc) noexcept : tape{doc.tape.get()}, current_string_buf_loc{doc.string_buf.get()} {}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_string(json_iterator &iter, const uint8_t *value, bool key) noexcept {
iter.log_value(key ? "key" : "string");
uint8_t *dst = on_start_string(iter);
dst = stringparsing::parse_string(value+1, dst, false); // We do not allow replacement when the escape characters are invalid.
if (dst == nullptr) {
iter.log_error("Invalid escape in string");
return STRING_ERROR;
}
on_end_string(dst);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_root_string(json_iterator &iter, const uint8_t *value) noexcept {
return visit_string(iter, value);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_number(json_iterator &iter, const uint8_t *value) noexcept {
iter.log_value("number");
return numberparsing::parse_number(value, tape);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_root_number(json_iterator &iter, const uint8_t *value) noexcept {
//
// We need to make a copy to make sure that the string is space terminated.
// This is not about padding the input, which should already padded up
// to len + SIMDJSON_PADDING. However, we have no control at this stage
// on how the padding was done. What if the input string was padded with nulls?
// It is quite common for an input string to have an extra null character (C string).
// We do not want to allow 9\0 (where \0 is the null character) inside a JSON
// document, but the string "9\0" by itself is fine. So we make a copy and
// pad the input with spaces when we know that there is just one input element.
// This copy is relatively expensive, but it will almost never be called in
// practice unless you are in the strange scenario where you have many JSON
// documents made of single atoms.
//
std::unique_ptr<uint8_t[]>copy(new (std::nothrow) uint8_t[iter.remaining_len() + SIMDJSON_PADDING]);
if (copy.get() == nullptr) { return MEMALLOC; }
std::memcpy(copy.get(), value, iter.remaining_len());
std::memset(copy.get() + iter.remaining_len(), ' ', SIMDJSON_PADDING);
error_code error = visit_number(iter, copy.get());
return error;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_true_atom(json_iterator &iter, const uint8_t *value) noexcept {
iter.log_value("true");
if (!atomparsing::is_valid_true_atom(value)) { return T_ATOM_ERROR; }
tape.append(0, internal::tape_type::TRUE_VALUE);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_root_true_atom(json_iterator &iter, const uint8_t *value) noexcept {
iter.log_value("true");
if (!atomparsing::is_valid_true_atom(value, iter.remaining_len())) { return T_ATOM_ERROR; }
tape.append(0, internal::tape_type::TRUE_VALUE);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_false_atom(json_iterator &iter, const uint8_t *value) noexcept {
iter.log_value("false");
if (!atomparsing::is_valid_false_atom(value)) { return F_ATOM_ERROR; }
tape.append(0, internal::tape_type::FALSE_VALUE);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_root_false_atom(json_iterator &iter, const uint8_t *value) noexcept {
iter.log_value("false");
if (!atomparsing::is_valid_false_atom(value, iter.remaining_len())) { return F_ATOM_ERROR; }
tape.append(0, internal::tape_type::FALSE_VALUE);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_null_atom(json_iterator &iter, const uint8_t *value) noexcept {
iter.log_value("null");
if (!atomparsing::is_valid_null_atom(value)) { return N_ATOM_ERROR; }
tape.append(0, internal::tape_type::NULL_VALUE);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_root_null_atom(json_iterator &iter, const uint8_t *value) noexcept {
iter.log_value("null");
if (!atomparsing::is_valid_null_atom(value, iter.remaining_len())) { return N_ATOM_ERROR; }
tape.append(0, internal::tape_type::NULL_VALUE);
return SUCCESS;
}
// private:
simdjson_inline uint32_t tape_builder::next_tape_index(json_iterator &iter) const noexcept {
return uint32_t(tape.next_tape_loc - iter.dom_parser.doc->tape.get());
}
simdjson_warn_unused simdjson_inline error_code tape_builder::empty_container(json_iterator &iter, internal::tape_type start, internal::tape_type end) noexcept {
auto start_index = next_tape_index(iter);
tape.append(start_index+2, start);
tape.append(start_index, end);
return SUCCESS;
}
simdjson_inline void tape_builder::start_container(json_iterator &iter) noexcept {
iter.dom_parser.open_containers[iter.depth].tape_index = next_tape_index(iter);
iter.dom_parser.open_containers[iter.depth].count = 0;
tape.skip(); // We don't actually *write* the start element until the end.
}
simdjson_warn_unused simdjson_inline error_code tape_builder::end_container(json_iterator &iter, internal::tape_type start, internal::tape_type end) noexcept {
// Write the ending tape element, pointing at the start location
const uint32_t start_tape_index = iter.dom_parser.open_containers[iter.depth].tape_index;
tape.append(start_tape_index, end);
// Write the start tape element, pointing at the end location (and including count)
// count can overflow if it exceeds 24 bits... so we saturate
// the convention being that a cnt of 0xffffff or more is undetermined in value (>= 0xffffff).
const uint32_t count = iter.dom_parser.open_containers[iter.depth].count;
const uint32_t cntsat = count > 0xFFFFFF ? 0xFFFFFF : count;
tape_writer::write(iter.dom_parser.doc->tape[start_tape_index], next_tape_index(iter) | (uint64_t(cntsat) << 32), start);
return SUCCESS;
}
simdjson_inline uint8_t *tape_builder::on_start_string(json_iterator &iter) noexcept {
// we advance the point, accounting for the fact that we have a NULL termination
tape.append(current_string_buf_loc - iter.dom_parser.doc->string_buf.get(), internal::tape_type::STRING);
return current_string_buf_loc + sizeof(uint32_t);
}
simdjson_inline void tape_builder::on_end_string(uint8_t *dst) noexcept {
uint32_t str_length = uint32_t(dst - (current_string_buf_loc + sizeof(uint32_t)));
// TODO check for overflow in case someone has a crazy string (>=4GB?)
// But only add the overflow check when the document itself exceeds 4GB
// Currently unneeded because we refuse to parse docs larger or equal to 4GB.
memcpy(current_string_buf_loc, &str_length, sizeof(uint32_t));
// NULL termination is still handy if you expect all your strings to
// be NULL terminated? It comes at a small cost
*dst = 0;
current_string_buf_loc = dst + 1;
}
} // namespace stage2
} // unnamed namespace
} // namespace haswell
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE2_TAPE_BUILDER_H
/* end file generic/stage2/tape_builder.h for haswell */
/* end file generic/stage2/amalgamated.h for haswell */
//
// Stage 1
//
namespace simdjson {
namespace haswell {
simdjson_warn_unused error_code implementation::create_dom_parser_implementation(
size_t capacity,
size_t max_depth,
std::unique_ptr<internal::dom_parser_implementation>& dst
) const noexcept {
dst.reset( new (std::nothrow) dom_parser_implementation() );
if (!dst) { return MEMALLOC; }
if (auto err = dst->set_capacity(capacity))
return err;
if (auto err = dst->set_max_depth(max_depth))
return err;
return SUCCESS;
}
namespace {
using namespace simd;
// This identifies structural characters (comma, colon, braces, brackets),
// and ASCII white-space ('\r','\n','\t',' ').
simdjson_inline json_character_block json_character_block::classify(const simd::simd8x64<uint8_t>& in) {
// These lookups rely on the fact that anything < 127 will match the lower 4 bits, which is why
// we can't use the generic lookup_16.
const auto whitespace_table = simd8<uint8_t>::repeat_16(' ', 100, 100, 100, 17, 100, 113, 2, 100, '\t', '\n', 112, 100, '\r', 100, 100);
// The 6 operators (:,[]{}) have these values:
//
// , 2C
// : 3A
// [ 5B
// { 7B
// ] 5D
// } 7D
//
// If you use | 0x20 to turn [ and ] into { and }, the lower 4 bits of each character is unique.
// We exploit this, using a simd 4-bit lookup to tell us which character match against, and then
// match it (against | 0x20).
//
// To prevent recognizing other characters, everything else gets compared with 0, which cannot
// match due to the | 0x20.
//
// NOTE: Due to the | 0x20, this ALSO treats <FF> and <SUB> (control characters 0C and 1A) like ,
// and :. This gets caught in stage 2, which checks the actual character to ensure the right
// operators are in the right places.
const auto op_table = simd8<uint8_t>::repeat_16(
0, 0, 0, 0,
0, 0, 0, 0,
0, 0, ':', '{', // : = 3A, [ = 5B, { = 7B
',', '}', 0, 0 // , = 2C, ] = 5D, } = 7D
);
// We compute whitespace and op separately. If later code only uses one or the
// other, given the fact that all functions are aggressively inlined, we can
// hope that useless computations will be omitted. This is namely case when
// minifying (we only need whitespace).
const uint64_t whitespace = in.eq({
_mm256_shuffle_epi8(whitespace_table, in.chunks[0]),
_mm256_shuffle_epi8(whitespace_table, in.chunks[1])
});
// Turn [ and ] into { and }
const simd8x64<uint8_t> curlified{
in.chunks[0] | 0x20,
in.chunks[1] | 0x20
};
const uint64_t op = curlified.eq({
_mm256_shuffle_epi8(op_table, in.chunks[0]),
_mm256_shuffle_epi8(op_table, in.chunks[1])
});
return { whitespace, op };
}
simdjson_inline bool is_ascii(const simd8x64<uint8_t>& input) {
return input.reduce_or().is_ascii();
}
simdjson_unused simdjson_inline simd8<bool> must_be_continuation(const simd8<uint8_t> prev1, const simd8<uint8_t> prev2, const simd8<uint8_t> prev3) {
simd8<uint8_t> is_second_byte = prev1.saturating_sub(0xc0u-1); // Only 11______ will be > 0
simd8<uint8_t> is_third_byte = prev2.saturating_sub(0xe0u-1); // Only 111_____ will be > 0
simd8<uint8_t> is_fourth_byte = prev3.saturating_sub(0xf0u-1); // Only 1111____ will be > 0
// Caller requires a bool (all 1's). All values resulting from the subtraction will be <= 64, so signed comparison is fine.
return simd8<int8_t>(is_second_byte | is_third_byte | is_fourth_byte) > int8_t(0);
}
simdjson_inline simd8<uint8_t> must_be_2_3_continuation(const simd8<uint8_t> prev2, const simd8<uint8_t> prev3) {
simd8<uint8_t> is_third_byte = prev2.saturating_sub(0xe0u-0x80); // Only 111_____ will be >= 0x80
simd8<uint8_t> is_fourth_byte = prev3.saturating_sub(0xf0u-0x80); // Only 1111____ will be >= 0x80
return is_third_byte | is_fourth_byte;
}
} // unnamed namespace
} // namespace haswell
} // namespace simdjson
//
// Stage 2
//
//
// Implementation-specific overrides
//
namespace simdjson {
namespace haswell {
simdjson_warn_unused error_code implementation::minify(const uint8_t *buf, size_t len, uint8_t *dst, size_t &dst_len) const noexcept {
return haswell::stage1::json_minifier::minify<128>(buf, len, dst, dst_len);
}
simdjson_warn_unused error_code dom_parser_implementation::stage1(const uint8_t *_buf, size_t _len, stage1_mode streaming) noexcept {
this->buf = _buf;
this->len = _len;
return haswell::stage1::json_structural_indexer::index<128>(_buf, _len, *this, streaming);
}
simdjson_warn_unused bool implementation::validate_utf8(const char *buf, size_t len) const noexcept {
return haswell::stage1::generic_validate_utf8(buf,len);
}
simdjson_warn_unused error_code dom_parser_implementation::stage2(dom::document &_doc) noexcept {
return stage2::tape_builder::parse_document<false>(*this, _doc);
}
simdjson_warn_unused error_code dom_parser_implementation::stage2_next(dom::document &_doc) noexcept {
return stage2::tape_builder::parse_document<true>(*this, _doc);
}
simdjson_warn_unused uint8_t *dom_parser_implementation::parse_string(const uint8_t *src, uint8_t *dst, bool replacement_char) const noexcept {
return haswell::stringparsing::parse_string(src, dst, replacement_char);
}
simdjson_warn_unused uint8_t *dom_parser_implementation::parse_wobbly_string(const uint8_t *src, uint8_t *dst) const noexcept {
return haswell::stringparsing::parse_wobbly_string(src, dst);
}
simdjson_warn_unused error_code dom_parser_implementation::parse(const uint8_t *_buf, size_t _len, dom::document &_doc) noexcept {
auto error = stage1(_buf, _len, stage1_mode::regular);
if (error) { return error; }
return stage2(_doc);
}
} // namespace haswell
} // namespace simdjson
/* including simdjson/haswell/end.h: #include <simdjson/haswell/end.h> */
/* begin file simdjson/haswell/end.h */
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/haswell/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#if !SIMDJSON_CAN_ALWAYS_RUN_HASWELL
SIMDJSON_UNTARGET_REGION
#endif
/* undefining SIMDJSON_IMPLEMENTATION from "haswell" */
#undef SIMDJSON_IMPLEMENTATION
/* end file simdjson/haswell/end.h */
#endif // SIMDJSON_SRC_HASWELL_CPP
/* end file haswell.cpp */
#endif
#if SIMDJSON_IMPLEMENTATION_ICELAKE
/* including icelake.cpp: #include <icelake.cpp> */
/* begin file icelake.cpp */
#ifndef SIMDJSON_SRC_ICELAKE_CPP
#define SIMDJSON_SRC_ICELAKE_CPP
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include <base.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
/* including simdjson/icelake.h: #include <simdjson/icelake.h> */
/* begin file simdjson/icelake.h */
#ifndef SIMDJSON_ICELAKE_H
#define SIMDJSON_ICELAKE_H
/* including simdjson/icelake/begin.h: #include "simdjson/icelake/begin.h" */
/* begin file simdjson/icelake/begin.h */
/* defining SIMDJSON_IMPLEMENTATION to "icelake" */
#define SIMDJSON_IMPLEMENTATION icelake
/* including simdjson/icelake/base.h: #include "simdjson/icelake/base.h" */
/* begin file simdjson/icelake/base.h */
#ifndef SIMDJSON_ICELAKE_BASE_H
#define SIMDJSON_ICELAKE_BASE_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
// The constructor may be executed on any host, so we take care not to use SIMDJSON_TARGET_ICELAKE
namespace simdjson {
/**
* Implementation for Icelake (Intel AVX512).
*/
namespace icelake {
class implementation;
} // namespace icelake
} // namespace simdjson
#endif // SIMDJSON_ICELAKE_BASE_H
/* end file simdjson/icelake/base.h */
/* including simdjson/icelake/intrinsics.h: #include "simdjson/icelake/intrinsics.h" */
/* begin file simdjson/icelake/intrinsics.h */
#ifndef SIMDJSON_ICELAKE_INTRINSICS_H
#define SIMDJSON_ICELAKE_INTRINSICS_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/icelake/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#if SIMDJSON_VISUAL_STUDIO
// under clang within visual studio, this will include <x86intrin.h>
#include <intrin.h> // visual studio or clang
#else
#include <x86intrin.h> // elsewhere
#endif // SIMDJSON_VISUAL_STUDIO
#if SIMDJSON_CLANG_VISUAL_STUDIO
/**
* You are not supposed, normally, to include these
* headers directly. Instead you should either include intrin.h
* or x86intrin.h. However, when compiling with clang
* under Windows (i.e., when _MSC_VER is set), these headers
* only get included *if* the corresponding features are detected
* from macros:
* e.g., if __AVX2__ is set... in turn, we normally set these
* macros by compiling against the corresponding architecture
* (e.g., arch:AVX2, -mavx2, etc.) which compiles the whole
* software with these advanced instructions. In simdjson, we
* want to compile the whole program for a generic target,
* and only target our specific kernels. As a workaround,
* we directly include the needed headers. These headers would
* normally guard against such usage, but we carefully included
* <x86intrin.h> (or <intrin.h>) before, so the headers
* are fooled.
*/
#include <bmiintrin.h> // for _blsr_u64
#include <lzcntintrin.h> // for __lzcnt64
#include <immintrin.h> // for most things (AVX2, AVX512, _popcnt64)
#include <smmintrin.h>
#include <tmmintrin.h>
#include <avxintrin.h>
#include <avx2intrin.h>
#include <wmmintrin.h> // for _mm_clmulepi64_si128
// Important: we need the AVX-512 headers:
#include <avx512fintrin.h>
#include <avx512dqintrin.h>
#include <avx512cdintrin.h>
#include <avx512bwintrin.h>
#include <avx512vlintrin.h>
#include <avx512vbmiintrin.h>
#include <avx512vbmi2intrin.h>
// unfortunately, we may not get _blsr_u64, but, thankfully, clang
// has it as a macro.
#ifndef _blsr_u64
// we roll our own
#define _blsr_u64(n) ((n - 1) & n)
#endif // _blsr_u64
#endif // SIMDJSON_CLANG_VISUAL_STUDIO
static_assert(sizeof(__m512i) <= simdjson::SIMDJSON_PADDING, "insufficient padding for icelake");
#endif // SIMDJSON_ICELAKE_INTRINSICS_H
/* end file simdjson/icelake/intrinsics.h */
#if !SIMDJSON_CAN_ALWAYS_RUN_ICELAKE
SIMDJSON_TARGET_REGION("avx512f,avx512dq,avx512cd,avx512bw,avx512vbmi,avx512vbmi2,avx512vl,avx2,bmi,pclmul,lzcnt,popcnt")
#endif
/* including simdjson/icelake/bitmanipulation.h: #include "simdjson/icelake/bitmanipulation.h" */
/* begin file simdjson/icelake/bitmanipulation.h */
#ifndef SIMDJSON_ICELAKE_BITMANIPULATION_H
#define SIMDJSON_ICELAKE_BITMANIPULATION_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/icelake/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/icelake/intrinsics.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace icelake {
namespace {
// We sometimes call trailing_zero on inputs that are zero,
// but the algorithms do not end up using the returned value.
// Sadly, sanitizers are not smart enough to figure it out.
SIMDJSON_NO_SANITIZE_UNDEFINED
// This function can be used safely even if not all bytes have been
// initialized.
// See issue https://github.com/simdjson/simdjson/issues/1965
SIMDJSON_NO_SANITIZE_MEMORY
simdjson_inline int trailing_zeroes(uint64_t input_num) {
#if SIMDJSON_REGULAR_VISUAL_STUDIO
return (int)_tzcnt_u64(input_num);
#else // SIMDJSON_REGULAR_VISUAL_STUDIO
////////
// You might expect the next line to be equivalent to
// return (int)_tzcnt_u64(input_num);
// but the generated code differs and might be less efficient?
////////
return __builtin_ctzll(input_num);
#endif // SIMDJSON_REGULAR_VISUAL_STUDIO
}
/* result might be undefined when input_num is zero */
simdjson_inline uint64_t clear_lowest_bit(uint64_t input_num) {
return _blsr_u64(input_num);
}
/* result might be undefined when input_num is zero */
simdjson_inline int leading_zeroes(uint64_t input_num) {
return int(_lzcnt_u64(input_num));
}
#if SIMDJSON_REGULAR_VISUAL_STUDIO
simdjson_inline unsigned __int64 count_ones(uint64_t input_num) {
// note: we do not support legacy 32-bit Windows
return __popcnt64(input_num);// Visual Studio wants two underscores
}
#else
simdjson_inline long long int count_ones(uint64_t input_num) {
return _popcnt64(input_num);
}
#endif
simdjson_inline bool add_overflow(uint64_t value1, uint64_t value2,
uint64_t *result) {
#if SIMDJSON_REGULAR_VISUAL_STUDIO
return _addcarry_u64(0, value1, value2,
reinterpret_cast<unsigned __int64 *>(result));
#else
return __builtin_uaddll_overflow(value1, value2,
reinterpret_cast<unsigned long long *>(result));
#endif
}
} // unnamed namespace
} // namespace icelake
} // namespace simdjson
#endif // SIMDJSON_ICELAKE_BITMANIPULATION_H
/* end file simdjson/icelake/bitmanipulation.h */
/* including simdjson/icelake/bitmask.h: #include "simdjson/icelake/bitmask.h" */
/* begin file simdjson/icelake/bitmask.h */
#ifndef SIMDJSON_ICELAKE_BITMASK_H
#define SIMDJSON_ICELAKE_BITMASK_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/icelake/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/icelake/intrinsics.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace icelake {
namespace {
//
// Perform a "cumulative bitwise xor," flipping bits each time a 1 is encountered.
//
// For example, prefix_xor(00100100) == 00011100
//
simdjson_inline uint64_t prefix_xor(const uint64_t bitmask) {
// There should be no such thing with a processor supporting avx2
// but not clmul.
__m128i all_ones = _mm_set1_epi8('\xFF');
__m128i result = _mm_clmulepi64_si128(_mm_set_epi64x(0ULL, bitmask), all_ones, 0);
return _mm_cvtsi128_si64(result);
}
} // unnamed namespace
} // namespace icelake
} // namespace simdjson
#endif // SIMDJSON_ICELAKE_BITMASK_H
/* end file simdjson/icelake/bitmask.h */
/* including simdjson/icelake/simd.h: #include "simdjson/icelake/simd.h" */
/* begin file simdjson/icelake/simd.h */
#ifndef SIMDJSON_ICELAKE_SIMD_H
#define SIMDJSON_ICELAKE_SIMD_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/icelake/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/icelake/intrinsics.h" */
/* amalgamation skipped (editor-only): #include "simdjson/icelake/bitmanipulation.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/simdprune_tables.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#if defined(__GNUC__) && !defined(__clang__)
#if __GNUC__ == 8
#define SIMDJSON_GCC8 1
#endif // __GNUC__ == 8
#endif // defined(__GNUC__) && !defined(__clang__)
#if SIMDJSON_GCC8
/**
* GCC 8 fails to provide _mm512_set_epi8. We roll our own.
*/
inline __m512i _mm512_set_epi8(uint8_t a0, uint8_t a1, uint8_t a2, uint8_t a3, uint8_t a4, uint8_t a5, uint8_t a6, uint8_t a7, uint8_t a8, uint8_t a9, uint8_t a10, uint8_t a11, uint8_t a12, uint8_t a13, uint8_t a14, uint8_t a15, uint8_t a16, uint8_t a17, uint8_t a18, uint8_t a19, uint8_t a20, uint8_t a21, uint8_t a22, uint8_t a23, uint8_t a24, uint8_t a25, uint8_t a26, uint8_t a27, uint8_t a28, uint8_t a29, uint8_t a30, uint8_t a31, uint8_t a32, uint8_t a33, uint8_t a34, uint8_t a35, uint8_t a36, uint8_t a37, uint8_t a38, uint8_t a39, uint8_t a40, uint8_t a41, uint8_t a42, uint8_t a43, uint8_t a44, uint8_t a45, uint8_t a46, uint8_t a47, uint8_t a48, uint8_t a49, uint8_t a50, uint8_t a51, uint8_t a52, uint8_t a53, uint8_t a54, uint8_t a55, uint8_t a56, uint8_t a57, uint8_t a58, uint8_t a59, uint8_t a60, uint8_t a61, uint8_t a62, uint8_t a63) {
return _mm512_set_epi64(uint64_t(a7) + (uint64_t(a6) << 8) + (uint64_t(a5) << 16) + (uint64_t(a4) << 24) + (uint64_t(a3) << 32) + (uint64_t(a2) << 40) + (uint64_t(a1) << 48) + (uint64_t(a0) << 56),
uint64_t(a15) + (uint64_t(a14) << 8) + (uint64_t(a13) << 16) + (uint64_t(a12) << 24) + (uint64_t(a11) << 32) + (uint64_t(a10) << 40) + (uint64_t(a9) << 48) + (uint64_t(a8) << 56),
uint64_t(a23) + (uint64_t(a22) << 8) + (uint64_t(a21) << 16) + (uint64_t(a20) << 24) + (uint64_t(a19) << 32) + (uint64_t(a18) << 40) + (uint64_t(a17) << 48) + (uint64_t(a16) << 56),
uint64_t(a31) + (uint64_t(a30) << 8) + (uint64_t(a29) << 16) + (uint64_t(a28) << 24) + (uint64_t(a27) << 32) + (uint64_t(a26) << 40) + (uint64_t(a25) << 48) + (uint64_t(a24) << 56),
uint64_t(a39) + (uint64_t(a38) << 8) + (uint64_t(a37) << 16) + (uint64_t(a36) << 24) + (uint64_t(a35) << 32) + (uint64_t(a34) << 40) + (uint64_t(a33) << 48) + (uint64_t(a32) << 56),
uint64_t(a47) + (uint64_t(a46) << 8) + (uint64_t(a45) << 16) + (uint64_t(a44) << 24) + (uint64_t(a43) << 32) + (uint64_t(a42) << 40) + (uint64_t(a41) << 48) + (uint64_t(a40) << 56),
uint64_t(a55) + (uint64_t(a54) << 8) + (uint64_t(a53) << 16) + (uint64_t(a52) << 24) + (uint64_t(a51) << 32) + (uint64_t(a50) << 40) + (uint64_t(a49) << 48) + (uint64_t(a48) << 56),
uint64_t(a63) + (uint64_t(a62) << 8) + (uint64_t(a61) << 16) + (uint64_t(a60) << 24) + (uint64_t(a59) << 32) + (uint64_t(a58) << 40) + (uint64_t(a57) << 48) + (uint64_t(a56) << 56));
}
#endif // SIMDJSON_GCC8
namespace simdjson {
namespace icelake {
namespace {
namespace simd {
// Forward-declared so they can be used by splat and friends.
template<typename Child>
struct base {
__m512i value;
// Zero constructor
simdjson_inline base() : value{__m512i()} {}
// Conversion from SIMD register
simdjson_inline base(const __m512i _value) : value(_value) {}
// Conversion to SIMD register
simdjson_inline operator const __m512i&() const { return this->value; }
simdjson_inline operator __m512i&() { return this->value; }
// Bit operations
simdjson_inline Child operator|(const Child other) const { return _mm512_or_si512(*this, other); }
simdjson_inline Child operator&(const Child other) const { return _mm512_and_si512(*this, other); }
simdjson_inline Child operator^(const Child other) const { return _mm512_xor_si512(*this, other); }
simdjson_inline Child bit_andnot(const Child other) const { return _mm512_andnot_si512(other, *this); }
simdjson_inline Child& operator|=(const Child other) { auto this_cast = static_cast<Child*>(this); *this_cast = *this_cast | other; return *this_cast; }
simdjson_inline Child& operator&=(const Child other) { auto this_cast = static_cast<Child*>(this); *this_cast = *this_cast & other; return *this_cast; }
simdjson_inline Child& operator^=(const Child other) { auto this_cast = static_cast<Child*>(this); *this_cast = *this_cast ^ other; return *this_cast; }
};
// Forward-declared so they can be used by splat and friends.
template<typename T>
struct simd8;
template<typename T, typename Mask=simd8<bool>>
struct base8: base<simd8<T>> {
typedef uint32_t bitmask_t;
typedef uint64_t bitmask2_t;
simdjson_inline base8() : base<simd8<T>>() {}
simdjson_inline base8(const __m512i _value) : base<simd8<T>>(_value) {}
friend simdjson_really_inline uint64_t operator==(const simd8<T> lhs, const simd8<T> rhs) {
return _mm512_cmpeq_epi8_mask(lhs, rhs);
}
static const int SIZE = sizeof(base<T>::value);
template<int N=1>
simdjson_inline simd8<T> prev(const simd8<T> prev_chunk) const {
// workaround for compilers unable to figure out that 16 - N is a constant (GCC 8)
constexpr int shift = 16 - N;
return _mm512_alignr_epi8(*this, _mm512_permutex2var_epi64(prev_chunk, _mm512_set_epi64(13, 12, 11, 10, 9, 8, 7, 6), *this), shift);
}
};
// SIMD byte mask type (returned by things like eq and gt)
template<>
struct simd8<bool>: base8<bool> {
static simdjson_inline simd8<bool> splat(bool _value) { return _mm512_set1_epi8(uint8_t(-(!!_value))); }
simdjson_inline simd8<bool>() : base8() {}
simdjson_inline simd8<bool>(const __m512i _value) : base8<bool>(_value) {}
// Splat constructor
simdjson_inline simd8<bool>(bool _value) : base8<bool>(splat(_value)) {}
simdjson_inline bool any() const { return !!_mm512_test_epi8_mask (*this, *this); }
simdjson_inline simd8<bool> operator~() const { return *this ^ true; }
};
template<typename T>
struct base8_numeric: base8<T> {
static simdjson_inline simd8<T> splat(T _value) { return _mm512_set1_epi8(_value); }
static simdjson_inline simd8<T> zero() { return _mm512_setzero_si512(); }
static simdjson_inline simd8<T> load(const T values[64]) {
return _mm512_loadu_si512(reinterpret_cast<const __m512i *>(values));
}
// Repeat 16 values as many times as necessary (usually for lookup tables)
static simdjson_inline simd8<T> repeat_16(
T v0, T v1, T v2, T v3, T v4, T v5, T v6, T v7,
T v8, T v9, T v10, T v11, T v12, T v13, T v14, T v15
) {
return simd8<T>(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15,
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15,
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15,
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
);
}
simdjson_inline base8_numeric() : base8<T>() {}
simdjson_inline base8_numeric(const __m512i _value) : base8<T>(_value) {}
// Store to array
simdjson_inline void store(T dst[64]) const { return _mm512_storeu_si512(reinterpret_cast<__m512i *>(dst), *this); }
// Addition/subtraction are the same for signed and unsigned
simdjson_inline simd8<T> operator+(const simd8<T> other) const { return _mm512_add_epi8(*this, other); }
simdjson_inline simd8<T> operator-(const simd8<T> other) const { return _mm512_sub_epi8(*this, other); }
simdjson_inline simd8<T>& operator+=(const simd8<T> other) { *this = *this + other; return *static_cast<simd8<T>*>(this); }
simdjson_inline simd8<T>& operator-=(const simd8<T> other) { *this = *this - other; return *static_cast<simd8<T>*>(this); }
// Override to distinguish from bool version
simdjson_inline simd8<T> operator~() const { return *this ^ 0xFFu; }
// Perform a lookup assuming the value is between 0 and 16 (undefined behavior for out of range values)
template<typename L>
simdjson_inline simd8<L> lookup_16(simd8<L> lookup_table) const {
return _mm512_shuffle_epi8(lookup_table, *this);
}
// Copies to 'output" all bytes corresponding to a 0 in the mask (interpreted as a bitset).
// Passing a 0 value for mask would be equivalent to writing out every byte to output.
// Only the first 32 - count_ones(mask) bytes of the result are significant but 32 bytes
// get written.
// Design consideration: it seems like a function with the
// signature simd8<L> compress(uint32_t mask) would be
// sensible, but the AVX ISA makes this kind of approach difficult.
template<typename L>
simdjson_inline void compress(uint64_t mask, L * output) const {
_mm512_mask_compressstoreu_epi8 (output,~mask,*this);
}
template<typename L>
simdjson_inline simd8<L> lookup_16(
L replace0, L replace1, L replace2, L replace3,
L replace4, L replace5, L replace6, L replace7,
L replace8, L replace9, L replace10, L replace11,
L replace12, L replace13, L replace14, L replace15) const {
return lookup_16(simd8<L>::repeat_16(
replace0, replace1, replace2, replace3,
replace4, replace5, replace6, replace7,
replace8, replace9, replace10, replace11,
replace12, replace13, replace14, replace15
));
}
};
// Signed bytes
template<>
struct simd8<int8_t> : base8_numeric<int8_t> {
simdjson_inline simd8() : base8_numeric<int8_t>() {}
simdjson_inline simd8(const __m512i _value) : base8_numeric<int8_t>(_value) {}
// Splat constructor
simdjson_inline simd8(int8_t _value) : simd8(splat(_value)) {}
// Array constructor
simdjson_inline simd8(const int8_t values[64]) : simd8(load(values)) {}
// Member-by-member initialization
simdjson_inline simd8(
int8_t v0, int8_t v1, int8_t v2, int8_t v3, int8_t v4, int8_t v5, int8_t v6, int8_t v7,
int8_t v8, int8_t v9, int8_t v10, int8_t v11, int8_t v12, int8_t v13, int8_t v14, int8_t v15,
int8_t v16, int8_t v17, int8_t v18, int8_t v19, int8_t v20, int8_t v21, int8_t v22, int8_t v23,
int8_t v24, int8_t v25, int8_t v26, int8_t v27, int8_t v28, int8_t v29, int8_t v30, int8_t v31,
int8_t v32, int8_t v33, int8_t v34, int8_t v35, int8_t v36, int8_t v37, int8_t v38, int8_t v39,
int8_t v40, int8_t v41, int8_t v42, int8_t v43, int8_t v44, int8_t v45, int8_t v46, int8_t v47,
int8_t v48, int8_t v49, int8_t v50, int8_t v51, int8_t v52, int8_t v53, int8_t v54, int8_t v55,
int8_t v56, int8_t v57, int8_t v58, int8_t v59, int8_t v60, int8_t v61, int8_t v62, int8_t v63
) : simd8(_mm512_set_epi8(
v63, v62, v61, v60, v59, v58, v57, v56,
v55, v54, v53, v52, v51, v50, v49, v48,
v47, v46, v45, v44, v43, v42, v41, v40,
v39, v38, v37, v36, v35, v34, v33, v32,
v31, v30, v29, v28, v27, v26, v25, v24,
v23, v22, v21, v20, v19, v18, v17, v16,
v15, v14, v13, v12, v11, v10, v9, v8,
v7, v6, v5, v4, v3, v2, v1, v0
)) {}
// Repeat 16 values as many times as necessary (usually for lookup tables)
simdjson_inline static simd8<int8_t> repeat_16(
int8_t v0, int8_t v1, int8_t v2, int8_t v3, int8_t v4, int8_t v5, int8_t v6, int8_t v7,
int8_t v8, int8_t v9, int8_t v10, int8_t v11, int8_t v12, int8_t v13, int8_t v14, int8_t v15
) {
return simd8<int8_t>(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15,
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15,
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15,
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
);
}
// Order-sensitive comparisons
simdjson_inline simd8<int8_t> max_val(const simd8<int8_t> other) const { return _mm512_max_epi8(*this, other); }
simdjson_inline simd8<int8_t> min_val(const simd8<int8_t> other) const { return _mm512_min_epi8(*this, other); }
simdjson_inline simd8<bool> operator>(const simd8<int8_t> other) const { return _mm512_maskz_abs_epi8(_mm512_cmpgt_epi8_mask(*this, other),_mm512_set1_epi8(uint8_t(0x80))); }
simdjson_inline simd8<bool> operator<(const simd8<int8_t> other) const { return _mm512_maskz_abs_epi8(_mm512_cmpgt_epi8_mask(other, *this),_mm512_set1_epi8(uint8_t(0x80))); }
};
// Unsigned bytes
template<>
struct simd8<uint8_t>: base8_numeric<uint8_t> {
simdjson_inline simd8() : base8_numeric<uint8_t>() {}
simdjson_inline simd8(const __m512i _value) : base8_numeric<uint8_t>(_value) {}
// Splat constructor
simdjson_inline simd8(uint8_t _value) : simd8(splat(_value)) {}
// Array constructor
simdjson_inline simd8(const uint8_t values[64]) : simd8(load(values)) {}
// Member-by-member initialization
simdjson_inline simd8(
uint8_t v0, uint8_t v1, uint8_t v2, uint8_t v3, uint8_t v4, uint8_t v5, uint8_t v6, uint8_t v7,
uint8_t v8, uint8_t v9, uint8_t v10, uint8_t v11, uint8_t v12, uint8_t v13, uint8_t v14, uint8_t v15,
uint8_t v16, uint8_t v17, uint8_t v18, uint8_t v19, uint8_t v20, uint8_t v21, uint8_t v22, uint8_t v23,
uint8_t v24, uint8_t v25, uint8_t v26, uint8_t v27, uint8_t v28, uint8_t v29, uint8_t v30, uint8_t v31,
uint8_t v32, uint8_t v33, uint8_t v34, uint8_t v35, uint8_t v36, uint8_t v37, uint8_t v38, uint8_t v39,
uint8_t v40, uint8_t v41, uint8_t v42, uint8_t v43, uint8_t v44, uint8_t v45, uint8_t v46, uint8_t v47,
uint8_t v48, uint8_t v49, uint8_t v50, uint8_t v51, uint8_t v52, uint8_t v53, uint8_t v54, uint8_t v55,
uint8_t v56, uint8_t v57, uint8_t v58, uint8_t v59, uint8_t v60, uint8_t v61, uint8_t v62, uint8_t v63
) : simd8(_mm512_set_epi8(
v63, v62, v61, v60, v59, v58, v57, v56,
v55, v54, v53, v52, v51, v50, v49, v48,
v47, v46, v45, v44, v43, v42, v41, v40,
v39, v38, v37, v36, v35, v34, v33, v32,
v31, v30, v29, v28, v27, v26, v25, v24,
v23, v22, v21, v20, v19, v18, v17, v16,
v15, v14, v13, v12, v11, v10, v9, v8,
v7, v6, v5, v4, v3, v2, v1, v0
)) {}
// Repeat 16 values as many times as necessary (usually for lookup tables)
simdjson_inline static simd8<uint8_t> repeat_16(
uint8_t v0, uint8_t v1, uint8_t v2, uint8_t v3, uint8_t v4, uint8_t v5, uint8_t v6, uint8_t v7,
uint8_t v8, uint8_t v9, uint8_t v10, uint8_t v11, uint8_t v12, uint8_t v13, uint8_t v14, uint8_t v15
) {
return simd8<uint8_t>(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15,
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15,
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15,
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
);
}
// Saturated math
simdjson_inline simd8<uint8_t> saturating_add(const simd8<uint8_t> other) const { return _mm512_adds_epu8(*this, other); }
simdjson_inline simd8<uint8_t> saturating_sub(const simd8<uint8_t> other) const { return _mm512_subs_epu8(*this, other); }
// Order-specific operations
simdjson_inline simd8<uint8_t> max_val(const simd8<uint8_t> other) const { return _mm512_max_epu8(*this, other); }
simdjson_inline simd8<uint8_t> min_val(const simd8<uint8_t> other) const { return _mm512_min_epu8(other, *this); }
// Same as >, but only guarantees true is nonzero (< guarantees true = -1)
simdjson_inline simd8<uint8_t> gt_bits(const simd8<uint8_t> other) const { return this->saturating_sub(other); }
// Same as <, but only guarantees true is nonzero (< guarantees true = -1)
simdjson_inline simd8<uint8_t> lt_bits(const simd8<uint8_t> other) const { return other.saturating_sub(*this); }
simdjson_inline uint64_t operator<=(const simd8<uint8_t> other) const { return other.max_val(*this) == other; }
simdjson_inline uint64_t operator>=(const simd8<uint8_t> other) const { return other.min_val(*this) == other; }
simdjson_inline simd8<bool> operator>(const simd8<uint8_t> other) const { return this->gt_bits(other).any_bits_set(); }
simdjson_inline simd8<bool> operator<(const simd8<uint8_t> other) const { return this->lt_bits(other).any_bits_set(); }
// Bit-specific operations
simdjson_inline simd8<bool> bits_not_set() const { return _mm512_mask_blend_epi8(*this == uint8_t(0), _mm512_set1_epi8(0), _mm512_set1_epi8(-1)); }
simdjson_inline simd8<bool> bits_not_set(simd8<uint8_t> bits) const { return (*this & bits).bits_not_set(); }
simdjson_inline simd8<bool> any_bits_set() const { return ~this->bits_not_set(); }
simdjson_inline simd8<bool> any_bits_set(simd8<uint8_t> bits) const { return ~this->bits_not_set(bits); }
simdjson_inline bool is_ascii() const { return _mm512_movepi8_mask(*this) == 0; }
simdjson_inline bool bits_not_set_anywhere() const {
return !_mm512_test_epi8_mask(*this, *this);
}
simdjson_inline bool any_bits_set_anywhere() const { return !bits_not_set_anywhere(); }
simdjson_inline bool bits_not_set_anywhere(simd8<uint8_t> bits) const { return !_mm512_test_epi8_mask(*this, bits); }
simdjson_inline bool any_bits_set_anywhere(simd8<uint8_t> bits) const { return !bits_not_set_anywhere(bits); }
template<int N>
simdjson_inline simd8<uint8_t> shr() const { return simd8<uint8_t>(_mm512_srli_epi16(*this, N)) & uint8_t(0xFFu >> N); }
template<int N>
simdjson_inline simd8<uint8_t> shl() const { return simd8<uint8_t>(_mm512_slli_epi16(*this, N)) & uint8_t(0xFFu << N); }
// Get one of the bits and make a bitmask out of it.
// e.g. value.get_bit<7>() gets the high bit
template<int N>
simdjson_inline uint64_t get_bit() const { return _mm512_movepi8_mask(_mm512_slli_epi16(*this, 7-N)); }
};
template<typename T>
struct simd8x64 {
static constexpr int NUM_CHUNKS = 64 / sizeof(simd8<T>);
static_assert(NUM_CHUNKS == 1, "Icelake kernel should use one register per 64-byte block.");
const simd8<T> chunks[NUM_CHUNKS];
simd8x64(const simd8x64<T>& o) = delete; // no copy allowed
simd8x64<T>& operator=(const simd8<T>& other) = delete; // no assignment allowed
simd8x64() = delete; // no default constructor allowed
simdjson_inline simd8x64(const simd8<T> chunk0, const simd8<T> chunk1) : chunks{chunk0, chunk1} {}
simdjson_inline simd8x64(const simd8<T> chunk0) : chunks{chunk0} {}
simdjson_inline simd8x64(const T ptr[64]) : chunks{simd8<T>::load(ptr)} {}
simdjson_inline uint64_t compress(uint64_t mask, T * output) const {
this->chunks[0].compress(mask, output);
return 64 - count_ones(mask);
}
simdjson_inline void store(T ptr[64]) const {
this->chunks[0].store(ptr+sizeof(simd8<T>)*0);
}
simdjson_inline simd8<T> reduce_or() const {
return this->chunks[0];
}
simdjson_inline simd8x64<T> bit_or(const T m) const {
const simd8<T> mask = simd8<T>::splat(m);
return simd8x64<T>(
this->chunks[0] | mask
);
}
simdjson_inline uint64_t eq(const T m) const {
const simd8<T> mask = simd8<T>::splat(m);
return this->chunks[0] == mask;
}
simdjson_inline uint64_t eq(const simd8x64<uint8_t> &other) const {
return this->chunks[0] == other.chunks[0];
}
simdjson_inline uint64_t lteq(const T m) const {
const simd8<T> mask = simd8<T>::splat(m);
return this->chunks[0] <= mask;
}
}; // struct simd8x64<T>
} // namespace simd
} // unnamed namespace
} // namespace icelake
} // namespace simdjson
#endif // SIMDJSON_ICELAKE_SIMD_H
/* end file simdjson/icelake/simd.h */
/* including simdjson/icelake/stringparsing_defs.h: #include "simdjson/icelake/stringparsing_defs.h" */
/* begin file simdjson/icelake/stringparsing_defs.h */
#ifndef SIMDJSON_ICELAKE_STRINGPARSING_DEFS_H
#define SIMDJSON_ICELAKE_STRINGPARSING_DEFS_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/icelake/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/icelake/simd.h" */
/* amalgamation skipped (editor-only): #include "simdjson/icelake/bitmanipulation.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace icelake {
namespace {
using namespace simd;
// Holds backslashes and quotes locations.
struct backslash_and_quote {
public:
static constexpr uint32_t BYTES_PROCESSED = 64;
simdjson_inline static backslash_and_quote copy_and_find(const uint8_t *src, uint8_t *dst);
simdjson_inline bool has_quote_first() { return ((bs_bits - 1) & quote_bits) != 0; }
simdjson_inline bool has_backslash() { return ((quote_bits - 1) & bs_bits) != 0; }
simdjson_inline int quote_index() { return trailing_zeroes(quote_bits); }
simdjson_inline int backslash_index() { return trailing_zeroes(bs_bits); }
uint64_t bs_bits;
uint64_t quote_bits;
}; // struct backslash_and_quote
simdjson_inline backslash_and_quote backslash_and_quote::copy_and_find(const uint8_t *src, uint8_t *dst) {
// this can read up to 15 bytes beyond the buffer size, but we require
// SIMDJSON_PADDING of padding
static_assert(SIMDJSON_PADDING >= (BYTES_PROCESSED - 1), "backslash and quote finder must process fewer than SIMDJSON_PADDING bytes");
simd8<uint8_t> v(src);
// store to dest unconditionally - we can overwrite the bits we don't like later
v.store(dst);
return {
static_cast<uint64_t>(v == '\\'), // bs_bits
static_cast<uint64_t>(v == '"'), // quote_bits
};
}
} // unnamed namespace
} // namespace icelake
} // namespace simdjson
#endif // SIMDJSON_ICELAKE_STRINGPARSING_DEFS_H
/* end file simdjson/icelake/stringparsing_defs.h */
/* including simdjson/icelake/numberparsing_defs.h: #include "simdjson/icelake/numberparsing_defs.h" */
/* begin file simdjson/icelake/numberparsing_defs.h */
#ifndef SIMDJSON_ICELAKE_NUMBERPARSING_DEFS_H
#define SIMDJSON_ICELAKE_NUMBERPARSING_DEFS_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/icelake/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/icelake/intrinsics.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/numberparsing_tables.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace icelake {
namespace numberparsing {
static simdjson_inline uint32_t parse_eight_digits_unrolled(const uint8_t *chars) {
// this actually computes *16* values so we are being wasteful.
const __m128i ascii0 = _mm_set1_epi8('0');
const __m128i mul_1_10 =
_mm_setr_epi8(10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1);
const __m128i mul_1_100 = _mm_setr_epi16(100, 1, 100, 1, 100, 1, 100, 1);
const __m128i mul_1_10000 =
_mm_setr_epi16(10000, 1, 10000, 1, 10000, 1, 10000, 1);
const __m128i input = _mm_sub_epi8(
_mm_loadu_si128(reinterpret_cast<const __m128i *>(chars)), ascii0);
const __m128i t1 = _mm_maddubs_epi16(input, mul_1_10);
const __m128i t2 = _mm_madd_epi16(t1, mul_1_100);
const __m128i t3 = _mm_packus_epi32(t2, t2);
const __m128i t4 = _mm_madd_epi16(t3, mul_1_10000);
return _mm_cvtsi128_si32(
t4); // only captures the sum of the first 8 digits, drop the rest
}
/** @private */
simdjson_inline internal::value128 full_multiplication(uint64_t value1, uint64_t value2) {
internal::value128 answer;
#if SIMDJSON_REGULAR_VISUAL_STUDIO || SIMDJSON_IS_32BITS
#ifdef _M_ARM64
// ARM64 has native support for 64-bit multiplications, no need to emultate
answer.high = __umulh(value1, value2);
answer.low = value1 * value2;
#else
answer.low = _umul128(value1, value2, &answer.high); // _umul128 not available on ARM64
#endif // _M_ARM64
#else // SIMDJSON_REGULAR_VISUAL_STUDIO || SIMDJSON_IS_32BITS
__uint128_t r = (static_cast<__uint128_t>(value1)) * value2;
answer.low = uint64_t(r);
answer.high = uint64_t(r >> 64);
#endif
return answer;
}
} // namespace numberparsing
} // namespace icelake
} // namespace simdjson
#define SIMDJSON_SWAR_NUMBER_PARSING 1
#endif // SIMDJSON_ICELAKE_NUMBERPARSING_DEFS_H
/* end file simdjson/icelake/numberparsing_defs.h */
/* end file simdjson/icelake/begin.h */
/* including simdjson/generic/amalgamated.h for icelake: #include "simdjson/generic/amalgamated.h" */
/* begin file simdjson/generic/amalgamated.h for icelake */
#if defined(SIMDJSON_CONDITIONAL_INCLUDE) && !defined(SIMDJSON_GENERIC_DEPENDENCIES_H)
#error simdjson/generic/dependencies.h must be included before simdjson/generic/amalgamated.h!
#endif
/* including simdjson/generic/base.h for icelake: #include "simdjson/generic/base.h" */
/* begin file simdjson/generic/base.h for icelake */
#ifndef SIMDJSON_GENERIC_BASE_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_GENERIC_BASE_H */
/* amalgamation skipped (editor-only): #include "simdjson/base.h" */
/* amalgamation skipped (editor-only): // If we haven't got an implementation yet, we're in the editor, editing a generic file! Just */
/* amalgamation skipped (editor-only): // use the most advanced one we can so the most possible stuff can be tested. */
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_IMPLEMENTATION */
/* amalgamation skipped (editor-only): #include "simdjson/implementation_detection.h" */
/* amalgamation skipped (editor-only): #if SIMDJSON_IMPLEMENTATION_ICELAKE */
/* amalgamation skipped (editor-only): #include "simdjson/icelake/begin.h" */
/* amalgamation skipped (editor-only): #elif SIMDJSON_IMPLEMENTATION_HASWELL */
/* amalgamation skipped (editor-only): #include "simdjson/haswell/begin.h" */
/* amalgamation skipped (editor-only): #elif SIMDJSON_IMPLEMENTATION_WESTMERE */
/* amalgamation skipped (editor-only): #include "simdjson/westmere/begin.h" */
/* amalgamation skipped (editor-only): #elif SIMDJSON_IMPLEMENTATION_ARM64 */
/* amalgamation skipped (editor-only): #include "simdjson/arm64/begin.h" */
/* amalgamation skipped (editor-only): #elif SIMDJSON_IMPLEMENTATION_PPC64 */
/* amalgamation skipped (editor-only): #include "simdjson/ppc64/begin.h" */
/* amalgamation skipped (editor-only): #elif SIMDJSON_IMPLEMENTATION_FALLBACK */
/* amalgamation skipped (editor-only): #include "simdjson/fallback/begin.h" */
/* amalgamation skipped (editor-only): #else */
/* amalgamation skipped (editor-only): #error "All possible implementations (including fallback) have been disabled! simdjson will not run." */
/* amalgamation skipped (editor-only): #endif */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_IMPLEMENTATION */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace icelake {
struct open_container;
class dom_parser_implementation;
/**
* The type of a JSON number
*/
enum class number_type {
floating_point_number=1, /// a binary64 number
signed_integer, /// a signed integer that fits in a 64-bit word using two's complement
unsigned_integer, /// a positive integer larger or equal to 1<<63
big_integer /// a big integer that does not fit in a 64-bit word
};
} // namespace icelake
} // namespace simdjson
#endif // SIMDJSON_GENERIC_BASE_H
/* end file simdjson/generic/base.h for icelake */
/* including simdjson/generic/jsoncharutils.h for icelake: #include "simdjson/generic/jsoncharutils.h" */
/* begin file simdjson/generic/jsoncharutils.h for icelake */
#ifndef SIMDJSON_GENERIC_JSONCHARUTILS_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_GENERIC_JSONCHARUTILS_H */
/* amalgamation skipped (editor-only): #include "simdjson/generic/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/jsoncharutils_tables.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/numberparsing_tables.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace icelake {
namespace {
namespace jsoncharutils {
// return non-zero if not a structural or whitespace char
// zero otherwise
simdjson_inline uint32_t is_not_structural_or_whitespace(uint8_t c) {
return internal::structural_or_whitespace_negated[c];
}
simdjson_inline uint32_t is_structural_or_whitespace(uint8_t c) {
return internal::structural_or_whitespace[c];
}
// returns a value with the high 16 bits set if not valid
// otherwise returns the conversion of the 4 hex digits at src into the bottom
// 16 bits of the 32-bit return register
//
// see
// https://lemire.me/blog/2019/04/17/parsing-short-hexadecimal-strings-efficiently/
static inline uint32_t hex_to_u32_nocheck(
const uint8_t *src) { // strictly speaking, static inline is a C-ism
uint32_t v1 = internal::digit_to_val32[630 + src[0]];
uint32_t v2 = internal::digit_to_val32[420 + src[1]];
uint32_t v3 = internal::digit_to_val32[210 + src[2]];
uint32_t v4 = internal::digit_to_val32[0 + src[3]];
return v1 | v2 | v3 | v4;
}
// given a code point cp, writes to c
// the utf-8 code, outputting the length in
// bytes, if the length is zero, the code point
// is invalid
//
// This can possibly be made faster using pdep
// and clz and table lookups, but JSON documents
// have few escaped code points, and the following
// function looks cheap.
//
// Note: we assume that surrogates are treated separately
//
simdjson_inline size_t codepoint_to_utf8(uint32_t cp, uint8_t *c) {
if (cp <= 0x7F) {
c[0] = uint8_t(cp);
return 1; // ascii
}
if (cp <= 0x7FF) {
c[0] = uint8_t((cp >> 6) + 192);
c[1] = uint8_t((cp & 63) + 128);
return 2; // universal plane
// Surrogates are treated elsewhere...
//} //else if (0xd800 <= cp && cp <= 0xdfff) {
// return 0; // surrogates // could put assert here
} else if (cp <= 0xFFFF) {
c[0] = uint8_t((cp >> 12) + 224);
c[1] = uint8_t(((cp >> 6) & 63) + 128);
c[2] = uint8_t((cp & 63) + 128);
return 3;
} else if (cp <= 0x10FFFF) { // if you know you have a valid code point, this
// is not needed
c[0] = uint8_t((cp >> 18) + 240);
c[1] = uint8_t(((cp >> 12) & 63) + 128);
c[2] = uint8_t(((cp >> 6) & 63) + 128);
c[3] = uint8_t((cp & 63) + 128);
return 4;
}
// will return 0 when the code point was too large.
return 0; // bad r
}
#if SIMDJSON_IS_32BITS // _umul128 for x86, arm
// this is a slow emulation routine for 32-bit
//
static simdjson_inline uint64_t __emulu(uint32_t x, uint32_t y) {
return x * (uint64_t)y;
}
static simdjson_inline uint64_t _umul128(uint64_t ab, uint64_t cd, uint64_t *hi) {
uint64_t ad = __emulu((uint32_t)(ab >> 32), (uint32_t)cd);
uint64_t bd = __emulu((uint32_t)ab, (uint32_t)cd);
uint64_t adbc = ad + __emulu((uint32_t)ab, (uint32_t)(cd >> 32));
uint64_t adbc_carry = !!(adbc < ad);
uint64_t lo = bd + (adbc << 32);
*hi = __emulu((uint32_t)(ab >> 32), (uint32_t)(cd >> 32)) + (adbc >> 32) +
(adbc_carry << 32) + !!(lo < bd);
return lo;
}
#endif
} // namespace jsoncharutils
} // unnamed namespace
} // namespace icelake
} // namespace simdjson
#endif // SIMDJSON_GENERIC_JSONCHARUTILS_H
/* end file simdjson/generic/jsoncharutils.h for icelake */
/* including simdjson/generic/atomparsing.h for icelake: #include "simdjson/generic/atomparsing.h" */
/* begin file simdjson/generic/atomparsing.h for icelake */
#ifndef SIMDJSON_GENERIC_ATOMPARSING_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_GENERIC_ATOMPARSING_H */
/* amalgamation skipped (editor-only): #include "simdjson/generic/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/generic/jsoncharutils.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#include <cstring>
namespace simdjson {
namespace icelake {
namespace {
/// @private
namespace atomparsing {
// The string_to_uint32 is exclusively used to map literal strings to 32-bit values.
// We use memcpy instead of a pointer cast to avoid undefined behaviors since we cannot
// be certain that the character pointer will be properly aligned.
// You might think that using memcpy makes this function expensive, but you'd be wrong.
// All decent optimizing compilers (GCC, clang, Visual Studio) will compile string_to_uint32("false");
// to the compile-time constant 1936482662.
simdjson_inline uint32_t string_to_uint32(const char* str) { uint32_t val; std::memcpy(&val, str, sizeof(uint32_t)); return val; }
// Again in str4ncmp we use a memcpy to avoid undefined behavior. The memcpy may appear expensive.
// Yet all decent optimizing compilers will compile memcpy to a single instruction, just about.
simdjson_warn_unused
simdjson_inline uint32_t str4ncmp(const uint8_t *src, const char* atom) {
uint32_t srcval; // we want to avoid unaligned 32-bit loads (undefined in C/C++)
static_assert(sizeof(uint32_t) <= SIMDJSON_PADDING, "SIMDJSON_PADDING must be larger than 4 bytes");
std::memcpy(&srcval, src, sizeof(uint32_t));
return srcval ^ string_to_uint32(atom);
}
simdjson_warn_unused
simdjson_inline bool is_valid_true_atom(const uint8_t *src) {
return (str4ncmp(src, "true") | jsoncharutils::is_not_structural_or_whitespace(src[4])) == 0;
}
simdjson_warn_unused
simdjson_inline bool is_valid_true_atom(const uint8_t *src, size_t len) {
if (len > 4) { return is_valid_true_atom(src); }
else if (len == 4) { return !str4ncmp(src, "true"); }
else { return false; }
}
simdjson_warn_unused
simdjson_inline bool is_valid_false_atom(const uint8_t *src) {
return (str4ncmp(src+1, "alse") | jsoncharutils::is_not_structural_or_whitespace(src[5])) == 0;
}
simdjson_warn_unused
simdjson_inline bool is_valid_false_atom(const uint8_t *src, size_t len) {
if (len > 5) { return is_valid_false_atom(src); }
else if (len == 5) { return !str4ncmp(src+1, "alse"); }
else { return false; }
}
simdjson_warn_unused
simdjson_inline bool is_valid_null_atom(const uint8_t *src) {
return (str4ncmp(src, "null") | jsoncharutils::is_not_structural_or_whitespace(src[4])) == 0;
}
simdjson_warn_unused
simdjson_inline bool is_valid_null_atom(const uint8_t *src, size_t len) {
if (len > 4) { return is_valid_null_atom(src); }
else if (len == 4) { return !str4ncmp(src, "null"); }
else { return false; }
}
} // namespace atomparsing
} // unnamed namespace
} // namespace icelake
} // namespace simdjson
#endif // SIMDJSON_GENERIC_ATOMPARSING_H
/* end file simdjson/generic/atomparsing.h for icelake */
/* including simdjson/generic/dom_parser_implementation.h for icelake: #include "simdjson/generic/dom_parser_implementation.h" */
/* begin file simdjson/generic/dom_parser_implementation.h for icelake */
#ifndef SIMDJSON_GENERIC_DOM_PARSER_IMPLEMENTATION_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_GENERIC_DOM_PARSER_IMPLEMENTATION_H */
/* amalgamation skipped (editor-only): #include "simdjson/generic/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/dom_parser_implementation.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace icelake {
// expectation: sizeof(open_container) = 64/8.
struct open_container {
uint32_t tape_index; // where, on the tape, does the scope ([,{) begins
uint32_t count; // how many elements in the scope
}; // struct open_container
static_assert(sizeof(open_container) == 64/8, "Open container must be 64 bits");
class dom_parser_implementation final : public internal::dom_parser_implementation {
public:
/** Tape location of each open { or [ */
std::unique_ptr<open_container[]> open_containers{};
/** Whether each open container is a [ or { */
std::unique_ptr<bool[]> is_array{};
/** Buffer passed to stage 1 */
const uint8_t *buf{};
/** Length passed to stage 1 */
size_t len{0};
/** Document passed to stage 2 */
dom::document *doc{};
inline dom_parser_implementation() noexcept;
inline dom_parser_implementation(dom_parser_implementation &&other) noexcept;
inline dom_parser_implementation &operator=(dom_parser_implementation &&other) noexcept;
dom_parser_implementation(const dom_parser_implementation &) = delete;
dom_parser_implementation &operator=(const dom_parser_implementation &) = delete;
simdjson_warn_unused error_code parse(const uint8_t *buf, size_t len, dom::document &doc) noexcept final;
simdjson_warn_unused error_code stage1(const uint8_t *buf, size_t len, stage1_mode partial) noexcept final;
simdjson_warn_unused error_code stage2(dom::document &doc) noexcept final;
simdjson_warn_unused error_code stage2_next(dom::document &doc) noexcept final;
simdjson_warn_unused uint8_t *parse_string(const uint8_t *src, uint8_t *dst, bool allow_replacement) const noexcept final;
simdjson_warn_unused uint8_t *parse_wobbly_string(const uint8_t *src, uint8_t *dst) const noexcept final;
inline simdjson_warn_unused error_code set_capacity(size_t capacity) noexcept final;
inline simdjson_warn_unused error_code set_max_depth(size_t max_depth) noexcept final;
private:
simdjson_inline simdjson_warn_unused error_code set_capacity_stage1(size_t capacity);
};
} // namespace icelake
} // namespace simdjson
namespace simdjson {
namespace icelake {
inline dom_parser_implementation::dom_parser_implementation() noexcept = default;
inline dom_parser_implementation::dom_parser_implementation(dom_parser_implementation &&other) noexcept = default;
inline dom_parser_implementation &dom_parser_implementation::operator=(dom_parser_implementation &&other) noexcept = default;
// Leaving these here so they can be inlined if so desired
inline simdjson_warn_unused error_code dom_parser_implementation::set_capacity(size_t capacity) noexcept {
if(capacity > SIMDJSON_MAXSIZE_BYTES) { return CAPACITY; }
// Stage 1 index output
size_t max_structures = SIMDJSON_ROUNDUP_N(capacity, 64) + 2 + 7;
structural_indexes.reset( new (std::nothrow) uint32_t[max_structures] );
if (!structural_indexes) { _capacity = 0; return MEMALLOC; }
structural_indexes[0] = 0;
n_structural_indexes = 0;
_capacity = capacity;
return SUCCESS;
}
inline simdjson_warn_unused error_code dom_parser_implementation::set_max_depth(size_t max_depth) noexcept {
// Stage 2 stacks
open_containers.reset(new (std::nothrow) open_container[max_depth]);
is_array.reset(new (std::nothrow) bool[max_depth]);
if (!is_array || !open_containers) { _max_depth = 0; return MEMALLOC; }
_max_depth = max_depth;
return SUCCESS;
}
} // namespace icelake
} // namespace simdjson
#endif // SIMDJSON_GENERIC_DOM_PARSER_IMPLEMENTATION_H
/* end file simdjson/generic/dom_parser_implementation.h for icelake */
/* including simdjson/generic/implementation_simdjson_result_base.h for icelake: #include "simdjson/generic/implementation_simdjson_result_base.h" */
/* begin file simdjson/generic/implementation_simdjson_result_base.h for icelake */
#ifndef SIMDJSON_GENERIC_IMPLEMENTATION_SIMDJSON_RESULT_BASE_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_GENERIC_IMPLEMENTATION_SIMDJSON_RESULT_BASE_H */
/* amalgamation skipped (editor-only): #include "simdjson/generic/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace icelake {
// This is a near copy of include/error.h's implementation_simdjson_result_base, except it doesn't use std::pair
// so we can avoid inlining errors
// TODO reconcile these!
/**
* The result of a simdjson operation that could fail.
*
* Gives the option of reading error codes, or throwing an exception by casting to the desired result.
*
* This is a base class for implementations that want to add functions to the result type for
* chaining.
*
* Override like:
*
* struct simdjson_result<T> : public internal::implementation_simdjson_result_base<T> {
* simdjson_result() noexcept : internal::implementation_simdjson_result_base<T>() {}
* simdjson_result(error_code error) noexcept : internal::implementation_simdjson_result_base<T>(error) {}
* simdjson_result(T &&value) noexcept : internal::implementation_simdjson_result_base<T>(std::forward(value)) {}
* simdjson_result(T &&value, error_code error) noexcept : internal::implementation_simdjson_result_base<T>(value, error) {}
* // Your extra methods here
* }
*
* Then any method returning simdjson_result<T> will be chainable with your methods.
*/
template<typename T>
struct implementation_simdjson_result_base {
/**
* Create a new empty result with error = UNINITIALIZED.
*/
simdjson_inline implementation_simdjson_result_base() noexcept = default;
/**
* Create a new error result.
*/
simdjson_inline implementation_simdjson_result_base(error_code error) noexcept;
/**
* Create a new successful result.
*/
simdjson_inline implementation_simdjson_result_base(T &&value) noexcept;
/**
* Create a new result with both things (use if you don't want to branch when creating the result).
*/
simdjson_inline implementation_simdjson_result_base(T &&value, error_code error) noexcept;
/**
* Move the value and the error to the provided variables.
*
* @param value The variable to assign the value to. May not be set if there is an error.
* @param error The variable to assign the error to. Set to SUCCESS if there is no error.
*/
simdjson_inline void tie(T &value, error_code &error) && noexcept;
/**
* Move the value to the provided variable.
*
* @param value The variable to assign the value to. May not be set if there is an error.
*/
simdjson_inline error_code get(T &value) && noexcept;
/**
* The error.
*/
simdjson_inline error_code error() const noexcept;
#if SIMDJSON_EXCEPTIONS
/**
* Get the result value.
*
* @throw simdjson_error if there was an error.
*/
simdjson_inline T& value() & noexcept(false);
/**
* Take the result value (move it).
*
* @throw simdjson_error if there was an error.
*/
simdjson_inline T&& value() && noexcept(false);
/**
* Take the result value (move it).
*
* @throw simdjson_error if there was an error.
*/
simdjson_inline T&& take_value() && noexcept(false);
/**
* Cast to the value (will throw on error).
*
* @throw simdjson_error if there was an error.
*/
simdjson_inline operator T&&() && noexcept(false);
#endif // SIMDJSON_EXCEPTIONS
/**
* Get the result value. This function is safe if and only
* the error() method returns a value that evaluates to false.
*/
simdjson_inline const T& value_unsafe() const& noexcept;
/**
* Get the result value. This function is safe if and only
* the error() method returns a value that evaluates to false.
*/
simdjson_inline T& value_unsafe() & noexcept;
/**
* Take the result value (move it). This function is safe if and only
* the error() method returns a value that evaluates to false.
*/
simdjson_inline T&& value_unsafe() && noexcept;
protected:
/** users should never directly access first and second. **/
T first{}; /** Users should never directly access 'first'. **/
error_code second{UNINITIALIZED}; /** Users should never directly access 'second'. **/
}; // struct implementation_simdjson_result_base
} // namespace icelake
} // namespace simdjson
#endif // SIMDJSON_GENERIC_IMPLEMENTATION_SIMDJSON_RESULT_BASE_H
/* end file simdjson/generic/implementation_simdjson_result_base.h for icelake */
/* including simdjson/generic/numberparsing.h for icelake: #include "simdjson/generic/numberparsing.h" */
/* begin file simdjson/generic/numberparsing.h for icelake */
#ifndef SIMDJSON_GENERIC_NUMBERPARSING_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_GENERIC_NUMBERPARSING_H */
/* amalgamation skipped (editor-only): #include "simdjson/generic/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/generic/jsoncharutils.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/numberparsing_tables.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#include <limits>
#include <ostream>
#include <cstring>
namespace simdjson {
namespace icelake {
namespace numberparsing {
#ifdef JSON_TEST_NUMBERS
#define INVALID_NUMBER(SRC) (found_invalid_number((SRC)), NUMBER_ERROR)
#define WRITE_INTEGER(VALUE, SRC, WRITER) (found_integer((VALUE), (SRC)), (WRITER).append_s64((VALUE)))
#define WRITE_UNSIGNED(VALUE, SRC, WRITER) (found_unsigned_integer((VALUE), (SRC)), (WRITER).append_u64((VALUE)))
#define WRITE_DOUBLE(VALUE, SRC, WRITER) (found_float((VALUE), (SRC)), (WRITER).append_double((VALUE)))
#define BIGINT_NUMBER(SRC) (found_invalid_number((SRC)), BIGINT_ERROR)
#else
#define INVALID_NUMBER(SRC) (NUMBER_ERROR)
#define WRITE_INTEGER(VALUE, SRC, WRITER) (WRITER).append_s64((VALUE))
#define WRITE_UNSIGNED(VALUE, SRC, WRITER) (WRITER).append_u64((VALUE))
#define WRITE_DOUBLE(VALUE, SRC, WRITER) (WRITER).append_double((VALUE))
#define BIGINT_NUMBER(SRC) (BIGINT_ERROR)
#endif
namespace {
// Convert a mantissa, an exponent and a sign bit into an ieee64 double.
// The real_exponent needs to be in [0, 2046] (technically real_exponent = 2047 would be acceptable).
// The mantissa should be in [0,1<<53). The bit at index (1ULL << 52) while be zeroed.
simdjson_inline double to_double(uint64_t mantissa, uint64_t real_exponent, bool negative) {
double d;
mantissa &= ~(1ULL << 52);
mantissa |= real_exponent << 52;
mantissa |= ((static_cast<uint64_t>(negative)) << 63);
std::memcpy(&d, &mantissa, sizeof(d));
return d;
}
// Attempts to compute i * 10^(power) exactly; and if "negative" is
// true, negate the result.
// This function will only work in some cases, when it does not work, success is
// set to false. This should work *most of the time* (like 99% of the time).
// We assume that power is in the [smallest_power,
// largest_power] interval: the caller is responsible for this check.
simdjson_inline bool compute_float_64(int64_t power, uint64_t i, bool negative, double &d) {
// we start with a fast path
// It was described in
// Clinger WD. How to read floating point numbers accurately.
// ACM SIGPLAN Notices. 1990
#ifndef FLT_EVAL_METHOD
#error "FLT_EVAL_METHOD should be defined, please include cfloat."
#endif
#if (FLT_EVAL_METHOD != 1) && (FLT_EVAL_METHOD != 0)
// We cannot be certain that x/y is rounded to nearest.
if (0 <= power && power <= 22 && i <= 9007199254740991)
#else
if (-22 <= power && power <= 22 && i <= 9007199254740991)
#endif
{
// convert the integer into a double. This is lossless since
// 0 <= i <= 2^53 - 1.
d = double(i);
//
// The general idea is as follows.
// If 0 <= s < 2^53 and if 10^0 <= p <= 10^22 then
// 1) Both s and p can be represented exactly as 64-bit floating-point
// values
// (binary64).
// 2) Because s and p can be represented exactly as floating-point values,
// then s * p
// and s / p will produce correctly rounded values.
//
if (power < 0) {
d = d / simdjson::internal::power_of_ten[-power];
} else {
d = d * simdjson::internal::power_of_ten[power];
}
if (negative) {
d = -d;
}
return true;
}
// When 22 < power && power < 22 + 16, we could
// hope for another, secondary fast path. It was
// described by David M. Gay in "Correctly rounded
// binary-decimal and decimal-binary conversions." (1990)
// If you need to compute i * 10^(22 + x) for x < 16,
// first compute i * 10^x, if you know that result is exact
// (e.g., when i * 10^x < 2^53),
// then you can still proceed and do (i * 10^x) * 10^22.
// Is this worth your time?
// You need 22 < power *and* power < 22 + 16 *and* (i * 10^(x-22) < 2^53)
// for this second fast path to work.
// If you you have 22 < power *and* power < 22 + 16, and then you
// optimistically compute "i * 10^(x-22)", there is still a chance that you
// have wasted your time if i * 10^(x-22) >= 2^53. It makes the use cases of
// this optimization maybe less common than we would like. Source:
// http://www.exploringbinary.com/fast-path-decimal-to-floating-point-conversion/
// also used in RapidJSON: https://rapidjson.org/strtod_8h_source.html
// The fast path has now failed, so we are failing back on the slower path.
// In the slow path, we need to adjust i so that it is > 1<<63 which is always
// possible, except if i == 0, so we handle i == 0 separately.
if(i == 0) {
d = negative ? -0.0 : 0.0;
return true;
}
// The exponent is 1024 + 63 + power
// + floor(log(5**power)/log(2)).
// The 1024 comes from the ieee64 standard.
// The 63 comes from the fact that we use a 64-bit word.
//
// Computing floor(log(5**power)/log(2)) could be
// slow. Instead we use a fast function.
//
// For power in (-400,350), we have that
// (((152170 + 65536) * power ) >> 16);
// is equal to
// floor(log(5**power)/log(2)) + power when power >= 0
// and it is equal to
// ceil(log(5**-power)/log(2)) + power when power < 0
//
// The 65536 is (1<<16) and corresponds to
// (65536 * power) >> 16 ---> power
//
// ((152170 * power ) >> 16) is equal to
// floor(log(5**power)/log(2))
//
// Note that this is not magic: 152170/(1<<16) is
// approximatively equal to log(5)/log(2).
// The 1<<16 value is a power of two; we could use a
// larger power of 2 if we wanted to.
//
int64_t exponent = (((152170 + 65536) * power) >> 16) + 1024 + 63;
// We want the most significant bit of i to be 1. Shift if needed.
int lz = leading_zeroes(i);
i <<= lz;
// We are going to need to do some 64-bit arithmetic to get a precise product.
// We use a table lookup approach.
// It is safe because
// power >= smallest_power
// and power <= largest_power
// We recover the mantissa of the power, it has a leading 1. It is always
// rounded down.
//
// We want the most significant 64 bits of the product. We know
// this will be non-zero because the most significant bit of i is
// 1.
const uint32_t index = 2 * uint32_t(power - simdjson::internal::smallest_power);
// Optimization: It may be that materializing the index as a variable might confuse some compilers and prevent effective complex-addressing loads. (Done for code clarity.)
//
// The full_multiplication function computes the 128-bit product of two 64-bit words
// with a returned value of type value128 with a "low component" corresponding to the
// 64-bit least significant bits of the product and with a "high component" corresponding
// to the 64-bit most significant bits of the product.
simdjson::internal::value128 firstproduct = full_multiplication(i, simdjson::internal::power_of_five_128[index]);
// Both i and power_of_five_128[index] have their most significant bit set to 1 which
// implies that the either the most or the second most significant bit of the product
// is 1. We pack values in this manner for efficiency reasons: it maximizes the use
// we make of the product. It also makes it easy to reason about the product: there
// is 0 or 1 leading zero in the product.
// Unless the least significant 9 bits of the high (64-bit) part of the full
// product are all 1s, then we know that the most significant 55 bits are
// exact and no further work is needed. Having 55 bits is necessary because
// we need 53 bits for the mantissa but we have to have one rounding bit and
// we can waste a bit if the most significant bit of the product is zero.
if((firstproduct.high & 0x1FF) == 0x1FF) {
// We want to compute i * 5^q, but only care about the top 55 bits at most.
// Consider the scenario where q>=0. Then 5^q may not fit in 64-bits. Doing
// the full computation is wasteful. So we do what is called a "truncated
// multiplication".
// We take the most significant 64-bits, and we put them in
// power_of_five_128[index]. Usually, that's good enough to approximate i * 5^q
// to the desired approximation using one multiplication. Sometimes it does not suffice.
// Then we store the next most significant 64 bits in power_of_five_128[index + 1], and
// then we get a better approximation to i * 5^q.
//
// That's for when q>=0. The logic for q<0 is somewhat similar but it is somewhat
// more complicated.
//
// There is an extra layer of complexity in that we need more than 55 bits of
// accuracy in the round-to-even scenario.
//
// The full_multiplication function computes the 128-bit product of two 64-bit words
// with a returned value of type value128 with a "low component" corresponding to the
// 64-bit least significant bits of the product and with a "high component" corresponding
// to the 64-bit most significant bits of the product.
simdjson::internal::value128 secondproduct = full_multiplication(i, simdjson::internal::power_of_five_128[index + 1]);
firstproduct.low += secondproduct.high;
if(secondproduct.high > firstproduct.low) { firstproduct.high++; }
// As it has been proven by Noble Mushtak and Daniel Lemire in "Fast Number Parsing Without
// Fallback" (https://arxiv.org/abs/2212.06644), at this point we are sure that the product
// is sufficiently accurate, and more computation is not needed.
}
uint64_t lower = firstproduct.low;
uint64_t upper = firstproduct.high;
// The final mantissa should be 53 bits with a leading 1.
// We shift it so that it occupies 54 bits with a leading 1.
///////
uint64_t upperbit = upper >> 63;
uint64_t mantissa = upper >> (upperbit + 9);
lz += int(1 ^ upperbit);
// Here we have mantissa < (1<<54).
int64_t real_exponent = exponent - lz;
if (simdjson_unlikely(real_exponent <= 0)) { // we have a subnormal?
// Here have that real_exponent <= 0 so -real_exponent >= 0
if(-real_exponent + 1 >= 64) { // if we have more than 64 bits below the minimum exponent, you have a zero for sure.
d = negative ? -0.0 : 0.0;
return true;
}
// next line is safe because -real_exponent + 1 < 0
mantissa >>= -real_exponent + 1;
// Thankfully, we can't have both "round-to-even" and subnormals because
// "round-to-even" only occurs for powers close to 0.
mantissa += (mantissa & 1); // round up
mantissa >>= 1;
// There is a weird scenario where we don't have a subnormal but just.
// Suppose we start with 2.2250738585072013e-308, we end up
// with 0x3fffffffffffff x 2^-1023-53 which is technically subnormal
// whereas 0x40000000000000 x 2^-1023-53 is normal. Now, we need to round
// up 0x3fffffffffffff x 2^-1023-53 and once we do, we are no longer
// subnormal, but we can only know this after rounding.
// So we only declare a subnormal if we are smaller than the threshold.
real_exponent = (mantissa < (uint64_t(1) << 52)) ? 0 : 1;
d = to_double(mantissa, real_exponent, negative);
return true;
}
// We have to round to even. The "to even" part
// is only a problem when we are right in between two floats
// which we guard against.
// If we have lots of trailing zeros, we may fall right between two
// floating-point values.
//
// The round-to-even cases take the form of a number 2m+1 which is in (2^53,2^54]
// times a power of two. That is, it is right between a number with binary significand
// m and another number with binary significand m+1; and it must be the case
// that it cannot be represented by a float itself.
//
// We must have that w * 10 ^q == (2m+1) * 2^p for some power of two 2^p.
// Recall that 10^q = 5^q * 2^q.
// When q >= 0, we must have that (2m+1) is divible by 5^q, so 5^q <= 2^54. We have that
// 5^23 <= 2^54 and it is the last power of five to qualify, so q <= 23.
// When q<0, we have w >= (2m+1) x 5^{-q}. We must have that w<2^{64} so
// (2m+1) x 5^{-q} < 2^{64}. We have that 2m+1>2^{53}. Hence, we must have
// 2^{53} x 5^{-q} < 2^{64}.
// Hence we have 5^{-q} < 2^{11}$ or q>= -4.
//
// We require lower <= 1 and not lower == 0 because we could not prove that
// that lower == 0 is implied; but we could prove that lower <= 1 is a necessary and sufficient test.
if (simdjson_unlikely((lower <= 1) && (power >= -4) && (power <= 23) && ((mantissa & 3) == 1))) {
if((mantissa << (upperbit + 64 - 53 - 2)) == upper) {
mantissa &= ~1; // flip it so that we do not round up
}
}
mantissa += mantissa & 1;
mantissa >>= 1;
// Here we have mantissa < (1<<53), unless there was an overflow
if (mantissa >= (1ULL << 53)) {
//////////
// This will happen when parsing values such as 7.2057594037927933e+16
////////
mantissa = (1ULL << 52);
real_exponent++;
}
mantissa &= ~(1ULL << 52);
// we have to check that real_exponent is in range, otherwise we bail out
if (simdjson_unlikely(real_exponent > 2046)) {
// We have an infinite value!!! We could actually throw an error here if we could.
return false;
}
d = to_double(mantissa, real_exponent, negative);
return true;
}
// We call a fallback floating-point parser that might be slow. Note
// it will accept JSON numbers, but the JSON spec. is more restrictive so
// before you call parse_float_fallback, you need to have validated the input
// string with the JSON grammar.
// It will return an error (false) if the parsed number is infinite.
// The string parsing itself always succeeds. We know that there is at least
// one digit.
static bool parse_float_fallback(const uint8_t *ptr, double *outDouble) {
*outDouble = simdjson::internal::from_chars(reinterpret_cast<const char *>(ptr));
// We do not accept infinite values.
// Detecting finite values in a portable manner is ridiculously hard, ideally
// we would want to do:
// return !std::isfinite(*outDouble);
// but that mysteriously fails under legacy/old libc++ libraries, see
// https://github.com/simdjson/simdjson/issues/1286
//
// Therefore, fall back to this solution (the extra parens are there
// to handle that max may be a macro on windows).
return !(*outDouble > (std::numeric_limits<double>::max)() || *outDouble < std::numeric_limits<double>::lowest());
}
static bool parse_float_fallback(const uint8_t *ptr, const uint8_t *end_ptr, double *outDouble) {
*outDouble = simdjson::internal::from_chars(reinterpret_cast<const char *>(ptr), reinterpret_cast<const char *>(end_ptr));
// We do not accept infinite values.
// Detecting finite values in a portable manner is ridiculously hard, ideally
// we would want to do:
// return !std::isfinite(*outDouble);
// but that mysteriously fails under legacy/old libc++ libraries, see
// https://github.com/simdjson/simdjson/issues/1286
//
// Therefore, fall back to this solution (the extra parens are there
// to handle that max may be a macro on windows).
return !(*outDouble > (std::numeric_limits<double>::max)() || *outDouble < std::numeric_limits<double>::lowest());
}
// check quickly whether the next 8 chars are made of digits
// at a glance, it looks better than Mula's
// http://0x80.pl/articles/swar-digits-validate.html
simdjson_inline bool is_made_of_eight_digits_fast(const uint8_t *chars) {
uint64_t val;
// this can read up to 7 bytes beyond the buffer size, but we require
// SIMDJSON_PADDING of padding
static_assert(7 <= SIMDJSON_PADDING, "SIMDJSON_PADDING must be bigger than 7");
std::memcpy(&val, chars, 8);
// a branchy method might be faster:
// return (( val & 0xF0F0F0F0F0F0F0F0 ) == 0x3030303030303030)
// && (( (val + 0x0606060606060606) & 0xF0F0F0F0F0F0F0F0 ) ==
// 0x3030303030303030);
return (((val & 0xF0F0F0F0F0F0F0F0) |
(((val + 0x0606060606060606) & 0xF0F0F0F0F0F0F0F0) >> 4)) ==
0x3333333333333333);
}
template<typename I>
SIMDJSON_NO_SANITIZE_UNDEFINED // We deliberately allow overflow here and check later
simdjson_inline bool parse_digit(const uint8_t c, I &i) {
const uint8_t digit = static_cast<uint8_t>(c - '0');
if (digit > 9) {
return false;
}
// PERF NOTE: multiplication by 10 is cheaper than arbitrary integer multiplication
i = 10 * i + digit; // might overflow, we will handle the overflow later
return true;
}
simdjson_inline bool is_digit(const uint8_t c) {
return static_cast<uint8_t>(c - '0') <= 9;
}
simdjson_inline error_code parse_decimal_after_separator(simdjson_unused const uint8_t *const src, const uint8_t *&p, uint64_t &i, int64_t &exponent) {
// we continue with the fiction that we have an integer. If the
// floating point number is representable as x * 10^z for some integer
// z that fits in 53 bits, then we will be able to convert back the
// the integer into a float in a lossless manner.
const uint8_t *const first_after_period = p;
#ifdef SIMDJSON_SWAR_NUMBER_PARSING
#if SIMDJSON_SWAR_NUMBER_PARSING
// this helps if we have lots of decimals!
// this turns out to be frequent enough.
if (is_made_of_eight_digits_fast(p)) {
i = i * 100000000 + parse_eight_digits_unrolled(p);
p += 8;
}
#endif // SIMDJSON_SWAR_NUMBER_PARSING
#endif // #ifdef SIMDJSON_SWAR_NUMBER_PARSING
// Unrolling the first digit makes a small difference on some implementations (e.g. westmere)
if (parse_digit(*p, i)) { ++p; }
while (parse_digit(*p, i)) { p++; }
exponent = first_after_period - p;
// Decimal without digits (123.) is illegal
if (exponent == 0) {
return INVALID_NUMBER(src);
}
return SUCCESS;
}
simdjson_inline error_code parse_exponent(simdjson_unused const uint8_t *const src, const uint8_t *&p, int64_t &exponent) {
// Exp Sign: -123.456e[-]78
bool neg_exp = ('-' == *p);
if (neg_exp || '+' == *p) { p++; } // Skip + as well
// Exponent: -123.456e-[78]
auto start_exp = p;
int64_t exp_number = 0;
while (parse_digit(*p, exp_number)) { ++p; }
// It is possible for parse_digit to overflow.
// In particular, it could overflow to INT64_MIN, and we cannot do - INT64_MIN.
// Thus we *must* check for possible overflow before we negate exp_number.
// Performance notes: it may seem like combining the two "simdjson_unlikely checks" below into
// a single simdjson_unlikely path would be faster. The reasoning is sound, but the compiler may
// not oblige and may, in fact, generate two distinct paths in any case. It might be
// possible to do uint64_t(p - start_exp - 1) >= 18 but it could end up trading off
// instructions for a simdjson_likely branch, an unconclusive gain.
// If there were no digits, it's an error.
if (simdjson_unlikely(p == start_exp)) {
return INVALID_NUMBER(src);
}
// We have a valid positive exponent in exp_number at this point, except that
// it may have overflowed.
// If there were more than 18 digits, we may have overflowed the integer. We have to do
// something!!!!
if (simdjson_unlikely(p > start_exp+18)) {
// Skip leading zeroes: 1e000000000000000000001 is technically valid and does not overflow
while (*start_exp == '0') { start_exp++; }
// 19 digits could overflow int64_t and is kind of absurd anyway. We don't
// support exponents smaller than -999,999,999,999,999,999 and bigger
// than 999,999,999,999,999,999.
// We can truncate.
// Note that 999999999999999999 is assuredly too large. The maximal ieee64 value before
// infinity is ~1.8e308. The smallest subnormal is ~5e-324. So, actually, we could
// truncate at 324.
// Note that there is no reason to fail per se at this point in time.
// E.g., 0e999999999999999999999 is a fine number.
if (p > start_exp+18) { exp_number = 999999999999999999; }
}
// At this point, we know that exp_number is a sane, positive, signed integer.
// It is <= 999,999,999,999,999,999. As long as 'exponent' is in
// [-8223372036854775808, 8223372036854775808], we won't overflow. Because 'exponent'
// is bounded in magnitude by the size of the JSON input, we are fine in this universe.
// To sum it up: the next line should never overflow.
exponent += (neg_exp ? -exp_number : exp_number);
return SUCCESS;
}
simdjson_inline bool check_if_integer(const uint8_t *const src, size_t max_length) {
const uint8_t *const srcend = src + max_length;
bool negative = (*src == '-'); // we can always read at least one character after the '-'
const uint8_t *p = src + uint8_t(negative);
if(p == srcend) { return false; }
if(*p == '0') {
++p;
if(p == srcend) { return true; }
if(jsoncharutils::is_not_structural_or_whitespace(*p)) { return false; }
return true;
}
while(p != srcend && is_digit(*p)) { ++p; }
if(p == srcend) { return true; }
if(jsoncharutils::is_not_structural_or_whitespace(*p)) { return false; }
return true;
}
simdjson_inline size_t significant_digits(const uint8_t * start_digits, size_t digit_count) {
// It is possible that the integer had an overflow.
// We have to handle the case where we have 0.0000somenumber.
const uint8_t *start = start_digits;
while ((*start == '0') || (*start == '.')) { ++start; }
// we over-decrement by one when there is a '.'
return digit_count - size_t(start - start_digits);
}
} // unnamed namespace
/** @private */
static error_code slow_float_parsing(simdjson_unused const uint8_t * src, double* answer) {
if (parse_float_fallback(src, answer)) {
return SUCCESS;
}
return INVALID_NUMBER(src);
}
/** @private */
template<typename W>
simdjson_inline error_code write_float(const uint8_t *const src, bool negative, uint64_t i, const uint8_t * start_digits, size_t digit_count, int64_t exponent, W &writer) {
// If we frequently had to deal with long strings of digits,
// we could extend our code by using a 128-bit integer instead
// of a 64-bit integer. However, this is uncommon in practice.
//
// 9999999999999999999 < 2**64 so we can accommodate 19 digits.
// If we have a decimal separator, then digit_count - 1 is the number of digits, but we
// may not have a decimal separator!
if (simdjson_unlikely(digit_count > 19 && significant_digits(start_digits, digit_count) > 19)) {
// Ok, chances are good that we had an overflow!
// this is almost never going to get called!!!
// we start anew, going slowly!!!
// This will happen in the following examples:
// 10000000000000000000000000000000000000000000e+308
// 3.1415926535897932384626433832795028841971693993751
//
// NOTE: We do not pass a reference to the to slow_float_parsing. If we passed our writer
// reference to it, it would force it to be stored in memory, preventing the compiler from
// picking it apart and putting into registers. i.e. if we pass it as reference,
// it gets slow.
double d;
error_code error = slow_float_parsing(src, &d);
writer.append_double(d);
return error;
}
// NOTE: it's weird that the simdjson_unlikely() only wraps half the if, but it seems to get slower any other
// way we've tried: https://github.com/simdjson/simdjson/pull/990#discussion_r448497331
// To future reader: we'd love if someone found a better way, or at least could explain this result!
if (simdjson_unlikely(exponent < simdjson::internal::smallest_power) || (exponent > simdjson::internal::largest_power)) {
//
// Important: smallest_power is such that it leads to a zero value.
// Observe that 18446744073709551615e-343 == 0, i.e. (2**64 - 1) e -343 is zero
// so something x 10^-343 goes to zero, but not so with something x 10^-342.
static_assert(simdjson::internal::smallest_power <= -342, "smallest_power is not small enough");
//
if((exponent < simdjson::internal::smallest_power) || (i == 0)) {
// E.g. Parse "-0.0e-999" into the same value as "-0.0". See https://en.wikipedia.org/wiki/Signed_zero
WRITE_DOUBLE(negative ? -0.0 : 0.0, src, writer);
return SUCCESS;
} else { // (exponent > largest_power) and (i != 0)
// We have, for sure, an infinite value and simdjson refuses to parse infinite values.
return INVALID_NUMBER(src);
}
}
double d;
if (!compute_float_64(exponent, i, negative, d)) {
// we are almost never going to get here.
if (!parse_float_fallback(src, &d)) { return INVALID_NUMBER(src); }
}
WRITE_DOUBLE(d, src, writer);
return SUCCESS;
}
// parse the number at src
// define JSON_TEST_NUMBERS for unit testing
//
// It is assumed that the number is followed by a structural ({,},],[) character
// or a white space character. If that is not the case (e.g., when the JSON
// document is made of a single number), then it is necessary to copy the
// content and append a space before calling this function.
//
// Our objective is accurate parsing (ULP of 0) at high speed.
template<typename W>
simdjson_inline error_code parse_number(const uint8_t *const src, W &writer);
// for performance analysis, it is sometimes useful to skip parsing
#ifdef SIMDJSON_SKIPNUMBERPARSING
template<typename W>
simdjson_inline error_code parse_number(const uint8_t *const, W &writer) {
writer.append_s64(0); // always write zero
return SUCCESS; // always succeeds
}
simdjson_unused simdjson_inline simdjson_result<uint64_t> parse_unsigned(const uint8_t * const src) noexcept { return 0; }
simdjson_unused simdjson_inline simdjson_result<int64_t> parse_integer(const uint8_t * const src) noexcept { return 0; }
simdjson_unused simdjson_inline simdjson_result<double> parse_double(const uint8_t * const src) noexcept { return 0; }
simdjson_unused simdjson_inline simdjson_result<uint64_t> parse_unsigned_in_string(const uint8_t * const src) noexcept { return 0; }
simdjson_unused simdjson_inline simdjson_result<int64_t> parse_integer_in_string(const uint8_t * const src) noexcept { return 0; }
simdjson_unused simdjson_inline simdjson_result<double> parse_double_in_string(const uint8_t * const src) noexcept { return 0; }
simdjson_unused simdjson_inline bool is_negative(const uint8_t * src) noexcept { return false; }
simdjson_unused simdjson_inline simdjson_result<bool> is_integer(const uint8_t * src) noexcept { return false; }
simdjson_unused simdjson_inline simdjson_result<number_type> get_number_type(const uint8_t * src) noexcept { return number_type::signed_integer; }
#else
// parse the number at src
// define JSON_TEST_NUMBERS for unit testing
//
// It is assumed that the number is followed by a structural ({,},],[) character
// or a white space character. If that is not the case (e.g., when the JSON
// document is made of a single number), then it is necessary to copy the
// content and append a space before calling this function.
//
// Our objective is accurate parsing (ULP of 0) at high speed.
template<typename W>
simdjson_inline error_code parse_number(const uint8_t *const src, W &writer) {
//
// Check for minus sign
//
bool negative = (*src == '-');
const uint8_t *p = src + uint8_t(negative);
//
// Parse the integer part.
//
// PERF NOTE: we don't use is_made_of_eight_digits_fast because large integers like 123456789 are rare
const uint8_t *const start_digits = p;
uint64_t i = 0;
while (parse_digit(*p, i)) { p++; }
// If there were no digits, or if the integer starts with 0 and has more than one digit, it's an error.
// Optimization note: size_t is expected to be unsigned.
size_t digit_count = size_t(p - start_digits);
if (digit_count == 0 || ('0' == *start_digits && digit_count > 1)) { return INVALID_NUMBER(src); }
//
// Handle floats if there is a . or e (or both)
//
int64_t exponent = 0;
bool is_float = false;
if ('.' == *p) {
is_float = true;
++p;
SIMDJSON_TRY( parse_decimal_after_separator(src, p, i, exponent) );
digit_count = int(p - start_digits); // used later to guard against overflows
}
if (('e' == *p) || ('E' == *p)) {
is_float = true;
++p;
SIMDJSON_TRY( parse_exponent(src, p, exponent) );
}
if (is_float) {
const bool dirty_end = jsoncharutils::is_not_structural_or_whitespace(*p);
SIMDJSON_TRY( write_float(src, negative, i, start_digits, digit_count, exponent, writer) );
if (dirty_end) { return INVALID_NUMBER(src); }
return SUCCESS;
}
// The longest negative 64-bit number is 19 digits.
// The longest positive 64-bit number is 20 digits.
// We do it this way so we don't trigger this branch unless we must.
size_t longest_digit_count = negative ? 19 : 20;
if (digit_count > longest_digit_count) { return BIGINT_NUMBER(src); }
if (digit_count == longest_digit_count) {
if (negative) {
// Anything negative above INT64_MAX+1 is invalid
if (i > uint64_t(INT64_MAX)+1) { return BIGINT_NUMBER(src); }
WRITE_INTEGER(~i+1, src, writer);
if (jsoncharutils::is_not_structural_or_whitespace(*p)) { return INVALID_NUMBER(src); }
return SUCCESS;
// Positive overflow check:
// - A 20 digit number starting with 2-9 is overflow, because 18,446,744,073,709,551,615 is the
// biggest uint64_t.
// - A 20 digit number starting with 1 is overflow if it is less than INT64_MAX.
// If we got here, it's a 20 digit number starting with the digit "1".
// - If a 20 digit number starting with 1 overflowed (i*10+digit), the result will be smaller
// than 1,553,255,926,290,448,384.
// - That is smaller than the smallest possible 20-digit number the user could write:
// 10,000,000,000,000,000,000.
// - Therefore, if the number is positive and lower than that, it's overflow.
// - The value we are looking at is less than or equal to INT64_MAX.
//
} else if (src[0] != uint8_t('1') || i <= uint64_t(INT64_MAX)) { return INVALID_NUMBER(src); }
}
// Write unsigned if it does not fit in a signed integer.
if (i > uint64_t(INT64_MAX)) {
WRITE_UNSIGNED(i, src, writer);
} else {
WRITE_INTEGER(negative ? (~i+1) : i, src, writer);
}
if (jsoncharutils::is_not_structural_or_whitespace(*p)) { return INVALID_NUMBER(src); }
return SUCCESS;
}
// Inlineable functions
namespace {
// This table can be used to characterize the final character of an integer
// string. For JSON structural character and allowable white space characters,
// we return SUCCESS. For 'e', '.' and 'E', we return INCORRECT_TYPE. Otherwise
// we return NUMBER_ERROR.
// Optimization note: we could easily reduce the size of the table by half (to 128)
// at the cost of an extra branch.
// Optimization note: we want the values to use at most 8 bits (not, e.g., 32 bits):
static_assert(error_code(uint8_t(NUMBER_ERROR))== NUMBER_ERROR, "bad NUMBER_ERROR cast");
static_assert(error_code(uint8_t(SUCCESS))== SUCCESS, "bad NUMBER_ERROR cast");
static_assert(error_code(uint8_t(INCORRECT_TYPE))== INCORRECT_TYPE, "bad NUMBER_ERROR cast");
const uint8_t integer_string_finisher[256] = {
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, SUCCESS,
SUCCESS, NUMBER_ERROR, NUMBER_ERROR, SUCCESS, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, SUCCESS, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, SUCCESS,
NUMBER_ERROR, INCORRECT_TYPE, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, SUCCESS, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, INCORRECT_TYPE,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, SUCCESS, NUMBER_ERROR, SUCCESS, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, INCORRECT_TYPE, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, SUCCESS, NUMBER_ERROR,
SUCCESS, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR};
// Parse any number from 0 to 18,446,744,073,709,551,615
simdjson_unused simdjson_inline simdjson_result<uint64_t> parse_unsigned(const uint8_t * const src) noexcept {
const uint8_t *p = src;
//
// Parse the integer part.
//
// PERF NOTE: we don't use is_made_of_eight_digits_fast because large integers like 123456789 are rare
const uint8_t *const start_digits = p;
uint64_t i = 0;
while (parse_digit(*p, i)) { p++; }
// If there were no digits, or if the integer starts with 0 and has more than one digit, it's an error.
// Optimization note: size_t is expected to be unsigned.
size_t digit_count = size_t(p - start_digits);
// The longest positive 64-bit number is 20 digits.
// We do it this way so we don't trigger this branch unless we must.
// Optimization note: the compiler can probably merge
// ((digit_count == 0) || (digit_count > 20))
// into a single branch since digit_count is unsigned.
if ((digit_count == 0) || (digit_count > 20)) { return INCORRECT_TYPE; }
// Here digit_count > 0.
if (('0' == *start_digits) && (digit_count > 1)) { return NUMBER_ERROR; }
// We can do the following...
// if (!jsoncharutils::is_structural_or_whitespace(*p)) {
// return (*p == '.' || *p == 'e' || *p == 'E') ? INCORRECT_TYPE : NUMBER_ERROR;
// }
// as a single table lookup:
if (integer_string_finisher[*p] != SUCCESS) { return error_code(integer_string_finisher[*p]); }
if (digit_count == 20) {
// Positive overflow check:
// - A 20 digit number starting with 2-9 is overflow, because 18,446,744,073,709,551,615 is the
// biggest uint64_t.
// - A 20 digit number starting with 1 is overflow if it is less than INT64_MAX.
// If we got here, it's a 20 digit number starting with the digit "1".
// - If a 20 digit number starting with 1 overflowed (i*10+digit), the result will be smaller
// than 1,553,255,926,290,448,384.
// - That is smaller than the smallest possible 20-digit number the user could write:
// 10,000,000,000,000,000,000.
// - Therefore, if the number is positive and lower than that, it's overflow.
// - The value we are looking at is less than or equal to INT64_MAX.
//
if (src[0] != uint8_t('1') || i <= uint64_t(INT64_MAX)) { return INCORRECT_TYPE; }
}
return i;
}
// Parse any number from 0 to 18,446,744,073,709,551,615
// Never read at src_end or beyond
simdjson_unused simdjson_inline simdjson_result<uint64_t> parse_unsigned(const uint8_t * const src, const uint8_t * const src_end) noexcept {
const uint8_t *p = src;
//
// Parse the integer part.
//
// PERF NOTE: we don't use is_made_of_eight_digits_fast because large integers like 123456789 are rare
const uint8_t *const start_digits = p;
uint64_t i = 0;
while ((p != src_end) && parse_digit(*p, i)) { p++; }
// If there were no digits, or if the integer starts with 0 and has more than one digit, it's an error.
// Optimization note: size_t is expected to be unsigned.
size_t digit_count = size_t(p - start_digits);
// The longest positive 64-bit number is 20 digits.
// We do it this way so we don't trigger this branch unless we must.
// Optimization note: the compiler can probably merge
// ((digit_count == 0) || (digit_count > 20))
// into a single branch since digit_count is unsigned.
if ((digit_count == 0) || (digit_count > 20)) { return INCORRECT_TYPE; }
// Here digit_count > 0.
if (('0' == *start_digits) && (digit_count > 1)) { return NUMBER_ERROR; }
// We can do the following...
// if (!jsoncharutils::is_structural_or_whitespace(*p)) {
// return (*p == '.' || *p == 'e' || *p == 'E') ? INCORRECT_TYPE : NUMBER_ERROR;
// }
// as a single table lookup:
if ((p != src_end) && integer_string_finisher[*p] != SUCCESS) { return error_code(integer_string_finisher[*p]); }
if (digit_count == 20) {
// Positive overflow check:
// - A 20 digit number starting with 2-9 is overflow, because 18,446,744,073,709,551,615 is the
// biggest uint64_t.
// - A 20 digit number starting with 1 is overflow if it is less than INT64_MAX.
// If we got here, it's a 20 digit number starting with the digit "1".
// - If a 20 digit number starting with 1 overflowed (i*10+digit), the result will be smaller
// than 1,553,255,926,290,448,384.
// - That is smaller than the smallest possible 20-digit number the user could write:
// 10,000,000,000,000,000,000.
// - Therefore, if the number is positive and lower than that, it's overflow.
// - The value we are looking at is less than or equal to INT64_MAX.
//
if (src[0] != uint8_t('1') || i <= uint64_t(INT64_MAX)) { return INCORRECT_TYPE; }
}
return i;
}
// Parse any number from 0 to 18,446,744,073,709,551,615
simdjson_unused simdjson_inline simdjson_result<uint64_t> parse_unsigned_in_string(const uint8_t * const src) noexcept {
const uint8_t *p = src + 1;
//
// Parse the integer part.
//
// PERF NOTE: we don't use is_made_of_eight_digits_fast because large integers like 123456789 are rare
const uint8_t *const start_digits = p;
uint64_t i = 0;
while (parse_digit(*p, i)) { p++; }
// If there were no digits, or if the integer starts with 0 and has more than one digit, it's an error.
// Optimization note: size_t is expected to be unsigned.
size_t digit_count = size_t(p - start_digits);
// The longest positive 64-bit number is 20 digits.
// We do it this way so we don't trigger this branch unless we must.
// Optimization note: the compiler can probably merge
// ((digit_count == 0) || (digit_count > 20))
// into a single branch since digit_count is unsigned.
if ((digit_count == 0) || (digit_count > 20)) { return INCORRECT_TYPE; }
// Here digit_count > 0.
if (('0' == *start_digits) && (digit_count > 1)) { return NUMBER_ERROR; }
// We can do the following...
// if (!jsoncharutils::is_structural_or_whitespace(*p)) {
// return (*p == '.' || *p == 'e' || *p == 'E') ? INCORRECT_TYPE : NUMBER_ERROR;
// }
// as a single table lookup:
if (*p != '"') { return NUMBER_ERROR; }
if (digit_count == 20) {
// Positive overflow check:
// - A 20 digit number starting with 2-9 is overflow, because 18,446,744,073,709,551,615 is the
// biggest uint64_t.
// - A 20 digit number starting with 1 is overflow if it is less than INT64_MAX.
// If we got here, it's a 20 digit number starting with the digit "1".
// - If a 20 digit number starting with 1 overflowed (i*10+digit), the result will be smaller
// than 1,553,255,926,290,448,384.
// - That is smaller than the smallest possible 20-digit number the user could write:
// 10,000,000,000,000,000,000.
// - Therefore, if the number is positive and lower than that, it's overflow.
// - The value we are looking at is less than or equal to INT64_MAX.
//
// Note: we use src[1] and not src[0] because src[0] is the quote character in this
// instance.
if (src[1] != uint8_t('1') || i <= uint64_t(INT64_MAX)) { return INCORRECT_TYPE; }
}
return i;
}
// Parse any number from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
simdjson_unused simdjson_inline simdjson_result<int64_t> parse_integer(const uint8_t *src) noexcept {
//
// Check for minus sign
//
bool negative = (*src == '-');
const uint8_t *p = src + uint8_t(negative);
//
// Parse the integer part.
//
// PERF NOTE: we don't use is_made_of_eight_digits_fast because large integers like 123456789 are rare
const uint8_t *const start_digits = p;
uint64_t i = 0;
while (parse_digit(*p, i)) { p++; }
// If there were no digits, or if the integer starts with 0 and has more than one digit, it's an error.
// Optimization note: size_t is expected to be unsigned.
size_t digit_count = size_t(p - start_digits);
// We go from
// -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
// so we can never represent numbers that have more than 19 digits.
size_t longest_digit_count = 19;
// Optimization note: the compiler can probably merge
// ((digit_count == 0) || (digit_count > longest_digit_count))
// into a single branch since digit_count is unsigned.
if ((digit_count == 0) || (digit_count > longest_digit_count)) { return INCORRECT_TYPE; }
// Here digit_count > 0.
if (('0' == *start_digits) && (digit_count > 1)) { return NUMBER_ERROR; }
// We can do the following...
// if (!jsoncharutils::is_structural_or_whitespace(*p)) {
// return (*p == '.' || *p == 'e' || *p == 'E') ? INCORRECT_TYPE : NUMBER_ERROR;
// }
// as a single table lookup:
if(integer_string_finisher[*p] != SUCCESS) { return error_code(integer_string_finisher[*p]); }
// Negative numbers have can go down to - INT64_MAX - 1 whereas positive numbers are limited to INT64_MAX.
// Performance note: This check is only needed when digit_count == longest_digit_count but it is
// so cheap that we might as well always make it.
if(i > uint64_t(INT64_MAX) + uint64_t(negative)) { return INCORRECT_TYPE; }
return negative ? (~i+1) : i;
}
// Parse any number from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
// Never read at src_end or beyond
simdjson_unused simdjson_inline simdjson_result<int64_t> parse_integer(const uint8_t * const src, const uint8_t * const src_end) noexcept {
//
// Check for minus sign
//
if(src == src_end) { return NUMBER_ERROR; }
bool negative = (*src == '-');
const uint8_t *p = src + uint8_t(negative);
//
// Parse the integer part.
//
// PERF NOTE: we don't use is_made_of_eight_digits_fast because large integers like 123456789 are rare
const uint8_t *const start_digits = p;
uint64_t i = 0;
while ((p != src_end) && parse_digit(*p, i)) { p++; }
// If there were no digits, or if the integer starts with 0 and has more than one digit, it's an error.
// Optimization note: size_t is expected to be unsigned.
size_t digit_count = size_t(p - start_digits);
// We go from
// -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
// so we can never represent numbers that have more than 19 digits.
size_t longest_digit_count = 19;
// Optimization note: the compiler can probably merge
// ((digit_count == 0) || (digit_count > longest_digit_count))
// into a single branch since digit_count is unsigned.
if ((digit_count == 0) || (digit_count > longest_digit_count)) { return INCORRECT_TYPE; }
// Here digit_count > 0.
if (('0' == *start_digits) && (digit_count > 1)) { return NUMBER_ERROR; }
// We can do the following...
// if (!jsoncharutils::is_structural_or_whitespace(*p)) {
// return (*p == '.' || *p == 'e' || *p == 'E') ? INCORRECT_TYPE : NUMBER_ERROR;
// }
// as a single table lookup:
if((p != src_end) && integer_string_finisher[*p] != SUCCESS) { return error_code(integer_string_finisher[*p]); }
// Negative numbers have can go down to - INT64_MAX - 1 whereas positive numbers are limited to INT64_MAX.
// Performance note: This check is only needed when digit_count == longest_digit_count but it is
// so cheap that we might as well always make it.
if(i > uint64_t(INT64_MAX) + uint64_t(negative)) { return INCORRECT_TYPE; }
return negative ? (~i+1) : i;
}
// Parse any number from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
simdjson_unused simdjson_inline simdjson_result<int64_t> parse_integer_in_string(const uint8_t *src) noexcept {
//
// Check for minus sign
//
bool negative = (*(src + 1) == '-');
src += uint8_t(negative) + 1;
//
// Parse the integer part.
//
// PERF NOTE: we don't use is_made_of_eight_digits_fast because large integers like 123456789 are rare
const uint8_t *const start_digits = src;
uint64_t i = 0;
while (parse_digit(*src, i)) { src++; }
// If there were no digits, or if the integer starts with 0 and has more than one digit, it's an error.
// Optimization note: size_t is expected to be unsigned.
size_t digit_count = size_t(src - start_digits);
// We go from
// -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
// so we can never represent numbers that have more than 19 digits.
size_t longest_digit_count = 19;
// Optimization note: the compiler can probably merge
// ((digit_count == 0) || (digit_count > longest_digit_count))
// into a single branch since digit_count is unsigned.
if ((digit_count == 0) || (digit_count > longest_digit_count)) { return INCORRECT_TYPE; }
// Here digit_count > 0.
if (('0' == *start_digits) && (digit_count > 1)) { return NUMBER_ERROR; }
// We can do the following...
// if (!jsoncharutils::is_structural_or_whitespace(*src)) {
// return (*src == '.' || *src == 'e' || *src == 'E') ? INCORRECT_TYPE : NUMBER_ERROR;
// }
// as a single table lookup:
if(*src != '"') { return NUMBER_ERROR; }
// Negative numbers have can go down to - INT64_MAX - 1 whereas positive numbers are limited to INT64_MAX.
// Performance note: This check is only needed when digit_count == longest_digit_count but it is
// so cheap that we might as well always make it.
if(i > uint64_t(INT64_MAX) + uint64_t(negative)) { return INCORRECT_TYPE; }
return negative ? (~i+1) : i;
}
simdjson_unused simdjson_inline simdjson_result<double> parse_double(const uint8_t * src) noexcept {
//
// Check for minus sign
//
bool negative = (*src == '-');
src += uint8_t(negative);
//
// Parse the integer part.
//
uint64_t i = 0;
const uint8_t *p = src;
p += parse_digit(*p, i);
bool leading_zero = (i == 0);
while (parse_digit(*p, i)) { p++; }
// no integer digits, or 0123 (zero must be solo)
if ( p == src ) { return INCORRECT_TYPE; }
if ( (leading_zero && p != src+1)) { return NUMBER_ERROR; }
//
// Parse the decimal part.
//
int64_t exponent = 0;
bool overflow;
if (simdjson_likely(*p == '.')) {
p++;
const uint8_t *start_decimal_digits = p;
if (!parse_digit(*p, i)) { return NUMBER_ERROR; } // no decimal digits
p++;
while (parse_digit(*p, i)) { p++; }
exponent = -(p - start_decimal_digits);
// Overflow check. More than 19 digits (minus the decimal) may be overflow.
overflow = p-src-1 > 19;
if (simdjson_unlikely(overflow && leading_zero)) {
// Skip leading 0.00000 and see if it still overflows
const uint8_t *start_digits = src + 2;
while (*start_digits == '0') { start_digits++; }
overflow = p-start_digits > 19;
}
} else {
overflow = p-src > 19;
}
//
// Parse the exponent
//
if (*p == 'e' || *p == 'E') {
p++;
bool exp_neg = *p == '-';
p += exp_neg || *p == '+';
uint64_t exp = 0;
const uint8_t *start_exp_digits = p;
while (parse_digit(*p, exp)) { p++; }
// no exp digits, or 20+ exp digits
if (p-start_exp_digits == 0 || p-start_exp_digits > 19) { return NUMBER_ERROR; }
exponent += exp_neg ? 0-exp : exp;
}
if (jsoncharutils::is_not_structural_or_whitespace(*p)) { return NUMBER_ERROR; }
overflow = overflow || exponent < simdjson::internal::smallest_power || exponent > simdjson::internal::largest_power;
//
// Assemble (or slow-parse) the float
//
double d;
if (simdjson_likely(!overflow)) {
if (compute_float_64(exponent, i, negative, d)) { return d; }
}
if (!parse_float_fallback(src - uint8_t(negative), &d)) {
return NUMBER_ERROR;
}
return d;
}
simdjson_unused simdjson_inline bool is_negative(const uint8_t * src) noexcept {
return (*src == '-');
}
simdjson_unused simdjson_inline simdjson_result<bool> is_integer(const uint8_t * src) noexcept {
bool negative = (*src == '-');
src += uint8_t(negative);
const uint8_t *p = src;
while(static_cast<uint8_t>(*p - '0') <= 9) { p++; }
if ( p == src ) { return NUMBER_ERROR; }
if (jsoncharutils::is_structural_or_whitespace(*p)) { return true; }
return false;
}
simdjson_unused simdjson_inline simdjson_result<number_type> get_number_type(const uint8_t * src) noexcept {
bool negative = (*src == '-');
src += uint8_t(negative);
const uint8_t *p = src;
while(static_cast<uint8_t>(*p - '0') <= 9) { p++; }
size_t digit_count = size_t(p - src);
if ( p == src ) { return NUMBER_ERROR; }
if (jsoncharutils::is_structural_or_whitespace(*p)) {
static const uint8_t * smaller_big_integer = reinterpret_cast<const uint8_t *>("9223372036854775808");
// We have an integer.
if(simdjson_unlikely(digit_count > 20)) {
return number_type::big_integer;
}
// If the number is negative and valid, it must be a signed integer.
if(negative) {
if (simdjson_unlikely(digit_count > 19)) return number_type::big_integer;
if (simdjson_unlikely(digit_count == 19 && memcmp(src, smaller_big_integer, 19) > 0)) {
return number_type::big_integer;
}
return number_type::signed_integer;
}
// Let us check if we have a big integer (>=2**64).
static const uint8_t * two_to_sixtyfour = reinterpret_cast<const uint8_t *>("18446744073709551616");
if((digit_count > 20) || (digit_count == 20 && memcmp(src, two_to_sixtyfour, 20) >= 0)) {
return number_type::big_integer;
}
// The number is positive and smaller than 18446744073709551616 (or 2**64).
// We want values larger or equal to 9223372036854775808 to be unsigned
// integers, and the other values to be signed integers.
if((digit_count == 20) || (digit_count >= 19 && memcmp(src, smaller_big_integer, 19) >= 0)) {
return number_type::unsigned_integer;
}
return number_type::signed_integer;
}
// Hopefully, we have 'e' or 'E' or '.'.
return number_type::floating_point_number;
}
// Never read at src_end or beyond
simdjson_unused simdjson_inline simdjson_result<double> parse_double(const uint8_t * src, const uint8_t * const src_end) noexcept {
if(src == src_end) { return NUMBER_ERROR; }
//
// Check for minus sign
//
bool negative = (*src == '-');
src += uint8_t(negative);
//
// Parse the integer part.
//
uint64_t i = 0;
const uint8_t *p = src;
if(p == src_end) { return NUMBER_ERROR; }
p += parse_digit(*p, i);
bool leading_zero = (i == 0);
while ((p != src_end) && parse_digit(*p, i)) { p++; }
// no integer digits, or 0123 (zero must be solo)
if ( p == src ) { return INCORRECT_TYPE; }
if ( (leading_zero && p != src+1)) { return NUMBER_ERROR; }
//
// Parse the decimal part.
//
int64_t exponent = 0;
bool overflow;
if (simdjson_likely((p != src_end) && (*p == '.'))) {
p++;
const uint8_t *start_decimal_digits = p;
if ((p == src_end) || !parse_digit(*p, i)) { return NUMBER_ERROR; } // no decimal digits
p++;
while ((p != src_end) && parse_digit(*p, i)) { p++; }
exponent = -(p - start_decimal_digits);
// Overflow check. More than 19 digits (minus the decimal) may be overflow.
overflow = p-src-1 > 19;
if (simdjson_unlikely(overflow && leading_zero)) {
// Skip leading 0.00000 and see if it still overflows
const uint8_t *start_digits = src + 2;
while (*start_digits == '0') { start_digits++; }
overflow = start_digits-src > 19;
}
} else {
overflow = p-src > 19;
}
//
// Parse the exponent
//
if ((p != src_end) && (*p == 'e' || *p == 'E')) {
p++;
if(p == src_end) { return NUMBER_ERROR; }
bool exp_neg = *p == '-';
p += exp_neg || *p == '+';
uint64_t exp = 0;
const uint8_t *start_exp_digits = p;
while ((p != src_end) && parse_digit(*p, exp)) { p++; }
// no exp digits, or 20+ exp digits
if (p-start_exp_digits == 0 || p-start_exp_digits > 19) { return NUMBER_ERROR; }
exponent += exp_neg ? 0-exp : exp;
}
if ((p != src_end) && jsoncharutils::is_not_structural_or_whitespace(*p)) { return NUMBER_ERROR; }
overflow = overflow || exponent < simdjson::internal::smallest_power || exponent > simdjson::internal::largest_power;
//
// Assemble (or slow-parse) the float
//
double d;
if (simdjson_likely(!overflow)) {
if (compute_float_64(exponent, i, negative, d)) { return d; }
}
if (!parse_float_fallback(src - uint8_t(negative), src_end, &d)) {
return NUMBER_ERROR;
}
return d;
}
simdjson_unused simdjson_inline simdjson_result<double> parse_double_in_string(const uint8_t * src) noexcept {
//
// Check for minus sign
//
bool negative = (*(src + 1) == '-');
src += uint8_t(negative) + 1;
//
// Parse the integer part.
//
uint64_t i = 0;
const uint8_t *p = src;
p += parse_digit(*p, i);
bool leading_zero = (i == 0);
while (parse_digit(*p, i)) { p++; }
// no integer digits, or 0123 (zero must be solo)
if ( p == src ) { return INCORRECT_TYPE; }
if ( (leading_zero && p != src+1)) { return NUMBER_ERROR; }
//
// Parse the decimal part.
//
int64_t exponent = 0;
bool overflow;
if (simdjson_likely(*p == '.')) {
p++;
const uint8_t *start_decimal_digits = p;
if (!parse_digit(*p, i)) { return NUMBER_ERROR; } // no decimal digits
p++;
while (parse_digit(*p, i)) { p++; }
exponent = -(p - start_decimal_digits);
// Overflow check. More than 19 digits (minus the decimal) may be overflow.
overflow = p-src-1 > 19;
if (simdjson_unlikely(overflow && leading_zero)) {
// Skip leading 0.00000 and see if it still overflows
const uint8_t *start_digits = src + 2;
while (*start_digits == '0') { start_digits++; }
overflow = p-start_digits > 19;
}
} else {
overflow = p-src > 19;
}
//
// Parse the exponent
//
if (*p == 'e' || *p == 'E') {
p++;
bool exp_neg = *p == '-';
p += exp_neg || *p == '+';
uint64_t exp = 0;
const uint8_t *start_exp_digits = p;
while (parse_digit(*p, exp)) { p++; }
// no exp digits, or 20+ exp digits
if (p-start_exp_digits == 0 || p-start_exp_digits > 19) { return NUMBER_ERROR; }
exponent += exp_neg ? 0-exp : exp;
}
if (*p != '"') { return NUMBER_ERROR; }
overflow = overflow || exponent < simdjson::internal::smallest_power || exponent > simdjson::internal::largest_power;
//
// Assemble (or slow-parse) the float
//
double d;
if (simdjson_likely(!overflow)) {
if (compute_float_64(exponent, i, negative, d)) { return d; }
}
if (!parse_float_fallback(src - uint8_t(negative), &d)) {
return NUMBER_ERROR;
}
return d;
}
} // unnamed namespace
#endif // SIMDJSON_SKIPNUMBERPARSING
} // namespace numberparsing
inline std::ostream& operator<<(std::ostream& out, number_type type) noexcept {
switch (type) {
case number_type::signed_integer: out << "integer in [-9223372036854775808,9223372036854775808)"; break;
case number_type::unsigned_integer: out << "unsigned integer in [9223372036854775808,18446744073709551616)"; break;
case number_type::floating_point_number: out << "floating-point number (binary64)"; break;
case number_type::big_integer: out << "big integer"; break;
default: SIMDJSON_UNREACHABLE();
}
return out;
}
} // namespace icelake
} // namespace simdjson
#endif // SIMDJSON_GENERIC_NUMBERPARSING_H
/* end file simdjson/generic/numberparsing.h for icelake */
/* including simdjson/generic/implementation_simdjson_result_base-inl.h for icelake: #include "simdjson/generic/implementation_simdjson_result_base-inl.h" */
/* begin file simdjson/generic/implementation_simdjson_result_base-inl.h for icelake */
#ifndef SIMDJSON_GENERIC_IMPLEMENTATION_SIMDJSON_RESULT_BASE_INL_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_GENERIC_IMPLEMENTATION_SIMDJSON_RESULT_BASE_INL_H */
/* amalgamation skipped (editor-only): #include "simdjson/generic/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/generic/implementation_simdjson_result_base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace icelake {
//
// internal::implementation_simdjson_result_base<T> inline implementation
//
template<typename T>
simdjson_inline void implementation_simdjson_result_base<T>::tie(T &value, error_code &error) && noexcept {
error = this->second;
if (!error) {
value = std::forward<implementation_simdjson_result_base<T>>(*this).first;
}
}
template<typename T>
simdjson_warn_unused simdjson_inline error_code implementation_simdjson_result_base<T>::get(T &value) && noexcept {
error_code error;
std::forward<implementation_simdjson_result_base<T>>(*this).tie(value, error);
return error;
}
template<typename T>
simdjson_inline error_code implementation_simdjson_result_base<T>::error() const noexcept {
return this->second;
}
#if SIMDJSON_EXCEPTIONS
template<typename T>
simdjson_inline T& implementation_simdjson_result_base<T>::value() & noexcept(false) {
if (error()) { throw simdjson_error(error()); }
return this->first;
}
template<typename T>
simdjson_inline T&& implementation_simdjson_result_base<T>::value() && noexcept(false) {
return std::forward<implementation_simdjson_result_base<T>>(*this).take_value();
}
template<typename T>
simdjson_inline T&& implementation_simdjson_result_base<T>::take_value() && noexcept(false) {
if (error()) { throw simdjson_error(error()); }
return std::forward<T>(this->first);
}
template<typename T>
simdjson_inline implementation_simdjson_result_base<T>::operator T&&() && noexcept(false) {
return std::forward<implementation_simdjson_result_base<T>>(*this).take_value();
}
#endif // SIMDJSON_EXCEPTIONS
template<typename T>
simdjson_inline const T& implementation_simdjson_result_base<T>::value_unsafe() const& noexcept {
return this->first;
}
template<typename T>
simdjson_inline T& implementation_simdjson_result_base<T>::value_unsafe() & noexcept {
return this->first;
}
template<typename T>
simdjson_inline T&& implementation_simdjson_result_base<T>::value_unsafe() && noexcept {
return std::forward<T>(this->first);
}
template<typename T>
simdjson_inline implementation_simdjson_result_base<T>::implementation_simdjson_result_base(T &&value, error_code error) noexcept
: first{std::forward<T>(value)}, second{error} {}
template<typename T>
simdjson_inline implementation_simdjson_result_base<T>::implementation_simdjson_result_base(error_code error) noexcept
: implementation_simdjson_result_base(T{}, error) {}
template<typename T>
simdjson_inline implementation_simdjson_result_base<T>::implementation_simdjson_result_base(T &&value) noexcept
: implementation_simdjson_result_base(std::forward<T>(value), SUCCESS) {}
} // namespace icelake
} // namespace simdjson
#endif // SIMDJSON_GENERIC_IMPLEMENTATION_SIMDJSON_RESULT_BASE_INL_H
/* end file simdjson/generic/implementation_simdjson_result_base-inl.h for icelake */
/* end file simdjson/generic/amalgamated.h for icelake */
/* including simdjson/icelake/end.h: #include "simdjson/icelake/end.h" */
/* begin file simdjson/icelake/end.h */
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/icelake/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#if !SIMDJSON_CAN_ALWAYS_RUN_ICELAKE
SIMDJSON_UNTARGET_REGION
#endif
/* undefining SIMDJSON_IMPLEMENTATION from "icelake" */
#undef SIMDJSON_IMPLEMENTATION
/* end file simdjson/icelake/end.h */
#endif // SIMDJSON_ICELAKE_H
/* end file simdjson/icelake.h */
/* including simdjson/icelake/implementation.h: #include <simdjson/icelake/implementation.h> */
/* begin file simdjson/icelake/implementation.h */
#ifndef SIMDJSON_ICELAKE_IMPLEMENTATION_H
#define SIMDJSON_ICELAKE_IMPLEMENTATION_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/icelake/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/implementation.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/instruction_set.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
// The constructor may be executed on any host, so we take care not to use SIMDJSON_TARGET_ICELAKE
namespace simdjson {
namespace icelake {
/**
* @private
*/
class implementation final : public simdjson::implementation {
public:
simdjson_inline implementation() : simdjson::implementation(
"icelake",
"Intel/AMD AVX512",
internal::instruction_set::AVX2 | internal::instruction_set::PCLMULQDQ | internal::instruction_set::BMI1 | internal::instruction_set::BMI2 | internal::instruction_set::AVX512F | internal::instruction_set::AVX512DQ | internal::instruction_set::AVX512CD | internal::instruction_set::AVX512BW | internal::instruction_set::AVX512VL | internal::instruction_set::AVX512VBMI2
) {}
simdjson_warn_unused error_code create_dom_parser_implementation(
size_t capacity,
size_t max_length,
std::unique_ptr<internal::dom_parser_implementation>& dst
) const noexcept final;
simdjson_warn_unused error_code minify(const uint8_t *buf, size_t len, uint8_t *dst, size_t &dst_len) const noexcept final;
simdjson_warn_unused bool validate_utf8(const char *buf, size_t len) const noexcept final;
};
} // namespace icelake
} // namespace simdjson
#endif // SIMDJSON_ICELAKE_IMPLEMENTATION_H
/* end file simdjson/icelake/implementation.h */
// defining SIMDJSON_GENERIC_JSON_STRUCTURAL_INDEXER_CUSTOM_BIT_INDEXER allows us to provide our own bit_indexer::write
#define SIMDJSON_GENERIC_JSON_STRUCTURAL_INDEXER_CUSTOM_BIT_INDEXER
/* including simdjson/icelake/begin.h: #include <simdjson/icelake/begin.h> */
/* begin file simdjson/icelake/begin.h */
/* defining SIMDJSON_IMPLEMENTATION to "icelake" */
#define SIMDJSON_IMPLEMENTATION icelake
/* including simdjson/icelake/base.h: #include "simdjson/icelake/base.h" */
/* begin file simdjson/icelake/base.h */
#ifndef SIMDJSON_ICELAKE_BASE_H
#define SIMDJSON_ICELAKE_BASE_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
// The constructor may be executed on any host, so we take care not to use SIMDJSON_TARGET_ICELAKE
namespace simdjson {
/**
* Implementation for Icelake (Intel AVX512).
*/
namespace icelake {
class implementation;
} // namespace icelake
} // namespace simdjson
#endif // SIMDJSON_ICELAKE_BASE_H
/* end file simdjson/icelake/base.h */
/* including simdjson/icelake/intrinsics.h: #include "simdjson/icelake/intrinsics.h" */
/* begin file simdjson/icelake/intrinsics.h */
#ifndef SIMDJSON_ICELAKE_INTRINSICS_H
#define SIMDJSON_ICELAKE_INTRINSICS_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/icelake/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#if SIMDJSON_VISUAL_STUDIO
// under clang within visual studio, this will include <x86intrin.h>
#include <intrin.h> // visual studio or clang
#else
#include <x86intrin.h> // elsewhere
#endif // SIMDJSON_VISUAL_STUDIO
#if SIMDJSON_CLANG_VISUAL_STUDIO
/**
* You are not supposed, normally, to include these
* headers directly. Instead you should either include intrin.h
* or x86intrin.h. However, when compiling with clang
* under Windows (i.e., when _MSC_VER is set), these headers
* only get included *if* the corresponding features are detected
* from macros:
* e.g., if __AVX2__ is set... in turn, we normally set these
* macros by compiling against the corresponding architecture
* (e.g., arch:AVX2, -mavx2, etc.) which compiles the whole
* software with these advanced instructions. In simdjson, we
* want to compile the whole program for a generic target,
* and only target our specific kernels. As a workaround,
* we directly include the needed headers. These headers would
* normally guard against such usage, but we carefully included
* <x86intrin.h> (or <intrin.h>) before, so the headers
* are fooled.
*/
#include <bmiintrin.h> // for _blsr_u64
#include <lzcntintrin.h> // for __lzcnt64
#include <immintrin.h> // for most things (AVX2, AVX512, _popcnt64)
#include <smmintrin.h>
#include <tmmintrin.h>
#include <avxintrin.h>
#include <avx2intrin.h>
#include <wmmintrin.h> // for _mm_clmulepi64_si128
// Important: we need the AVX-512 headers:
#include <avx512fintrin.h>
#include <avx512dqintrin.h>
#include <avx512cdintrin.h>
#include <avx512bwintrin.h>
#include <avx512vlintrin.h>
#include <avx512vbmiintrin.h>
#include <avx512vbmi2intrin.h>
// unfortunately, we may not get _blsr_u64, but, thankfully, clang
// has it as a macro.
#ifndef _blsr_u64
// we roll our own
#define _blsr_u64(n) ((n - 1) & n)
#endif // _blsr_u64
#endif // SIMDJSON_CLANG_VISUAL_STUDIO
static_assert(sizeof(__m512i) <= simdjson::SIMDJSON_PADDING, "insufficient padding for icelake");
#endif // SIMDJSON_ICELAKE_INTRINSICS_H
/* end file simdjson/icelake/intrinsics.h */
#if !SIMDJSON_CAN_ALWAYS_RUN_ICELAKE
SIMDJSON_TARGET_REGION("avx512f,avx512dq,avx512cd,avx512bw,avx512vbmi,avx512vbmi2,avx512vl,avx2,bmi,pclmul,lzcnt,popcnt")
#endif
/* including simdjson/icelake/bitmanipulation.h: #include "simdjson/icelake/bitmanipulation.h" */
/* begin file simdjson/icelake/bitmanipulation.h */
#ifndef SIMDJSON_ICELAKE_BITMANIPULATION_H
#define SIMDJSON_ICELAKE_BITMANIPULATION_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/icelake/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/icelake/intrinsics.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace icelake {
namespace {
// We sometimes call trailing_zero on inputs that are zero,
// but the algorithms do not end up using the returned value.
// Sadly, sanitizers are not smart enough to figure it out.
SIMDJSON_NO_SANITIZE_UNDEFINED
// This function can be used safely even if not all bytes have been
// initialized.
// See issue https://github.com/simdjson/simdjson/issues/1965
SIMDJSON_NO_SANITIZE_MEMORY
simdjson_inline int trailing_zeroes(uint64_t input_num) {
#if SIMDJSON_REGULAR_VISUAL_STUDIO
return (int)_tzcnt_u64(input_num);
#else // SIMDJSON_REGULAR_VISUAL_STUDIO
////////
// You might expect the next line to be equivalent to
// return (int)_tzcnt_u64(input_num);
// but the generated code differs and might be less efficient?
////////
return __builtin_ctzll(input_num);
#endif // SIMDJSON_REGULAR_VISUAL_STUDIO
}
/* result might be undefined when input_num is zero */
simdjson_inline uint64_t clear_lowest_bit(uint64_t input_num) {
return _blsr_u64(input_num);
}
/* result might be undefined when input_num is zero */
simdjson_inline int leading_zeroes(uint64_t input_num) {
return int(_lzcnt_u64(input_num));
}
#if SIMDJSON_REGULAR_VISUAL_STUDIO
simdjson_inline unsigned __int64 count_ones(uint64_t input_num) {
// note: we do not support legacy 32-bit Windows
return __popcnt64(input_num);// Visual Studio wants two underscores
}
#else
simdjson_inline long long int count_ones(uint64_t input_num) {
return _popcnt64(input_num);
}
#endif
simdjson_inline bool add_overflow(uint64_t value1, uint64_t value2,
uint64_t *result) {
#if SIMDJSON_REGULAR_VISUAL_STUDIO
return _addcarry_u64(0, value1, value2,
reinterpret_cast<unsigned __int64 *>(result));
#else
return __builtin_uaddll_overflow(value1, value2,
reinterpret_cast<unsigned long long *>(result));
#endif
}
} // unnamed namespace
} // namespace icelake
} // namespace simdjson
#endif // SIMDJSON_ICELAKE_BITMANIPULATION_H
/* end file simdjson/icelake/bitmanipulation.h */
/* including simdjson/icelake/bitmask.h: #include "simdjson/icelake/bitmask.h" */
/* begin file simdjson/icelake/bitmask.h */
#ifndef SIMDJSON_ICELAKE_BITMASK_H
#define SIMDJSON_ICELAKE_BITMASK_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/icelake/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/icelake/intrinsics.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace icelake {
namespace {
//
// Perform a "cumulative bitwise xor," flipping bits each time a 1 is encountered.
//
// For example, prefix_xor(00100100) == 00011100
//
simdjson_inline uint64_t prefix_xor(const uint64_t bitmask) {
// There should be no such thing with a processor supporting avx2
// but not clmul.
__m128i all_ones = _mm_set1_epi8('\xFF');
__m128i result = _mm_clmulepi64_si128(_mm_set_epi64x(0ULL, bitmask), all_ones, 0);
return _mm_cvtsi128_si64(result);
}
} // unnamed namespace
} // namespace icelake
} // namespace simdjson
#endif // SIMDJSON_ICELAKE_BITMASK_H
/* end file simdjson/icelake/bitmask.h */
/* including simdjson/icelake/simd.h: #include "simdjson/icelake/simd.h" */
/* begin file simdjson/icelake/simd.h */
#ifndef SIMDJSON_ICELAKE_SIMD_H
#define SIMDJSON_ICELAKE_SIMD_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/icelake/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/icelake/intrinsics.h" */
/* amalgamation skipped (editor-only): #include "simdjson/icelake/bitmanipulation.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/simdprune_tables.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#if defined(__GNUC__) && !defined(__clang__)
#if __GNUC__ == 8
#define SIMDJSON_GCC8 1
#endif // __GNUC__ == 8
#endif // defined(__GNUC__) && !defined(__clang__)
#if SIMDJSON_GCC8
/**
* GCC 8 fails to provide _mm512_set_epi8. We roll our own.
*/
inline __m512i _mm512_set_epi8(uint8_t a0, uint8_t a1, uint8_t a2, uint8_t a3, uint8_t a4, uint8_t a5, uint8_t a6, uint8_t a7, uint8_t a8, uint8_t a9, uint8_t a10, uint8_t a11, uint8_t a12, uint8_t a13, uint8_t a14, uint8_t a15, uint8_t a16, uint8_t a17, uint8_t a18, uint8_t a19, uint8_t a20, uint8_t a21, uint8_t a22, uint8_t a23, uint8_t a24, uint8_t a25, uint8_t a26, uint8_t a27, uint8_t a28, uint8_t a29, uint8_t a30, uint8_t a31, uint8_t a32, uint8_t a33, uint8_t a34, uint8_t a35, uint8_t a36, uint8_t a37, uint8_t a38, uint8_t a39, uint8_t a40, uint8_t a41, uint8_t a42, uint8_t a43, uint8_t a44, uint8_t a45, uint8_t a46, uint8_t a47, uint8_t a48, uint8_t a49, uint8_t a50, uint8_t a51, uint8_t a52, uint8_t a53, uint8_t a54, uint8_t a55, uint8_t a56, uint8_t a57, uint8_t a58, uint8_t a59, uint8_t a60, uint8_t a61, uint8_t a62, uint8_t a63) {
return _mm512_set_epi64(uint64_t(a7) + (uint64_t(a6) << 8) + (uint64_t(a5) << 16) + (uint64_t(a4) << 24) + (uint64_t(a3) << 32) + (uint64_t(a2) << 40) + (uint64_t(a1) << 48) + (uint64_t(a0) << 56),
uint64_t(a15) + (uint64_t(a14) << 8) + (uint64_t(a13) << 16) + (uint64_t(a12) << 24) + (uint64_t(a11) << 32) + (uint64_t(a10) << 40) + (uint64_t(a9) << 48) + (uint64_t(a8) << 56),
uint64_t(a23) + (uint64_t(a22) << 8) + (uint64_t(a21) << 16) + (uint64_t(a20) << 24) + (uint64_t(a19) << 32) + (uint64_t(a18) << 40) + (uint64_t(a17) << 48) + (uint64_t(a16) << 56),
uint64_t(a31) + (uint64_t(a30) << 8) + (uint64_t(a29) << 16) + (uint64_t(a28) << 24) + (uint64_t(a27) << 32) + (uint64_t(a26) << 40) + (uint64_t(a25) << 48) + (uint64_t(a24) << 56),
uint64_t(a39) + (uint64_t(a38) << 8) + (uint64_t(a37) << 16) + (uint64_t(a36) << 24) + (uint64_t(a35) << 32) + (uint64_t(a34) << 40) + (uint64_t(a33) << 48) + (uint64_t(a32) << 56),
uint64_t(a47) + (uint64_t(a46) << 8) + (uint64_t(a45) << 16) + (uint64_t(a44) << 24) + (uint64_t(a43) << 32) + (uint64_t(a42) << 40) + (uint64_t(a41) << 48) + (uint64_t(a40) << 56),
uint64_t(a55) + (uint64_t(a54) << 8) + (uint64_t(a53) << 16) + (uint64_t(a52) << 24) + (uint64_t(a51) << 32) + (uint64_t(a50) << 40) + (uint64_t(a49) << 48) + (uint64_t(a48) << 56),
uint64_t(a63) + (uint64_t(a62) << 8) + (uint64_t(a61) << 16) + (uint64_t(a60) << 24) + (uint64_t(a59) << 32) + (uint64_t(a58) << 40) + (uint64_t(a57) << 48) + (uint64_t(a56) << 56));
}
#endif // SIMDJSON_GCC8
namespace simdjson {
namespace icelake {
namespace {
namespace simd {
// Forward-declared so they can be used by splat and friends.
template<typename Child>
struct base {
__m512i value;
// Zero constructor
simdjson_inline base() : value{__m512i()} {}
// Conversion from SIMD register
simdjson_inline base(const __m512i _value) : value(_value) {}
// Conversion to SIMD register
simdjson_inline operator const __m512i&() const { return this->value; }
simdjson_inline operator __m512i&() { return this->value; }
// Bit operations
simdjson_inline Child operator|(const Child other) const { return _mm512_or_si512(*this, other); }
simdjson_inline Child operator&(const Child other) const { return _mm512_and_si512(*this, other); }
simdjson_inline Child operator^(const Child other) const { return _mm512_xor_si512(*this, other); }
simdjson_inline Child bit_andnot(const Child other) const { return _mm512_andnot_si512(other, *this); }
simdjson_inline Child& operator|=(const Child other) { auto this_cast = static_cast<Child*>(this); *this_cast = *this_cast | other; return *this_cast; }
simdjson_inline Child& operator&=(const Child other) { auto this_cast = static_cast<Child*>(this); *this_cast = *this_cast & other; return *this_cast; }
simdjson_inline Child& operator^=(const Child other) { auto this_cast = static_cast<Child*>(this); *this_cast = *this_cast ^ other; return *this_cast; }
};
// Forward-declared so they can be used by splat and friends.
template<typename T>
struct simd8;
template<typename T, typename Mask=simd8<bool>>
struct base8: base<simd8<T>> {
typedef uint32_t bitmask_t;
typedef uint64_t bitmask2_t;
simdjson_inline base8() : base<simd8<T>>() {}
simdjson_inline base8(const __m512i _value) : base<simd8<T>>(_value) {}
friend simdjson_really_inline uint64_t operator==(const simd8<T> lhs, const simd8<T> rhs) {
return _mm512_cmpeq_epi8_mask(lhs, rhs);
}
static const int SIZE = sizeof(base<T>::value);
template<int N=1>
simdjson_inline simd8<T> prev(const simd8<T> prev_chunk) const {
// workaround for compilers unable to figure out that 16 - N is a constant (GCC 8)
constexpr int shift = 16 - N;
return _mm512_alignr_epi8(*this, _mm512_permutex2var_epi64(prev_chunk, _mm512_set_epi64(13, 12, 11, 10, 9, 8, 7, 6), *this), shift);
}
};
// SIMD byte mask type (returned by things like eq and gt)
template<>
struct simd8<bool>: base8<bool> {
static simdjson_inline simd8<bool> splat(bool _value) { return _mm512_set1_epi8(uint8_t(-(!!_value))); }
simdjson_inline simd8<bool>() : base8() {}
simdjson_inline simd8<bool>(const __m512i _value) : base8<bool>(_value) {}
// Splat constructor
simdjson_inline simd8<bool>(bool _value) : base8<bool>(splat(_value)) {}
simdjson_inline bool any() const { return !!_mm512_test_epi8_mask (*this, *this); }
simdjson_inline simd8<bool> operator~() const { return *this ^ true; }
};
template<typename T>
struct base8_numeric: base8<T> {
static simdjson_inline simd8<T> splat(T _value) { return _mm512_set1_epi8(_value); }
static simdjson_inline simd8<T> zero() { return _mm512_setzero_si512(); }
static simdjson_inline simd8<T> load(const T values[64]) {
return _mm512_loadu_si512(reinterpret_cast<const __m512i *>(values));
}
// Repeat 16 values as many times as necessary (usually for lookup tables)
static simdjson_inline simd8<T> repeat_16(
T v0, T v1, T v2, T v3, T v4, T v5, T v6, T v7,
T v8, T v9, T v10, T v11, T v12, T v13, T v14, T v15
) {
return simd8<T>(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15,
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15,
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15,
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
);
}
simdjson_inline base8_numeric() : base8<T>() {}
simdjson_inline base8_numeric(const __m512i _value) : base8<T>(_value) {}
// Store to array
simdjson_inline void store(T dst[64]) const { return _mm512_storeu_si512(reinterpret_cast<__m512i *>(dst), *this); }
// Addition/subtraction are the same for signed and unsigned
simdjson_inline simd8<T> operator+(const simd8<T> other) const { return _mm512_add_epi8(*this, other); }
simdjson_inline simd8<T> operator-(const simd8<T> other) const { return _mm512_sub_epi8(*this, other); }
simdjson_inline simd8<T>& operator+=(const simd8<T> other) { *this = *this + other; return *static_cast<simd8<T>*>(this); }
simdjson_inline simd8<T>& operator-=(const simd8<T> other) { *this = *this - other; return *static_cast<simd8<T>*>(this); }
// Override to distinguish from bool version
simdjson_inline simd8<T> operator~() const { return *this ^ 0xFFu; }
// Perform a lookup assuming the value is between 0 and 16 (undefined behavior for out of range values)
template<typename L>
simdjson_inline simd8<L> lookup_16(simd8<L> lookup_table) const {
return _mm512_shuffle_epi8(lookup_table, *this);
}
// Copies to 'output" all bytes corresponding to a 0 in the mask (interpreted as a bitset).
// Passing a 0 value for mask would be equivalent to writing out every byte to output.
// Only the first 32 - count_ones(mask) bytes of the result are significant but 32 bytes
// get written.
// Design consideration: it seems like a function with the
// signature simd8<L> compress(uint32_t mask) would be
// sensible, but the AVX ISA makes this kind of approach difficult.
template<typename L>
simdjson_inline void compress(uint64_t mask, L * output) const {
_mm512_mask_compressstoreu_epi8 (output,~mask,*this);
}
template<typename L>
simdjson_inline simd8<L> lookup_16(
L replace0, L replace1, L replace2, L replace3,
L replace4, L replace5, L replace6, L replace7,
L replace8, L replace9, L replace10, L replace11,
L replace12, L replace13, L replace14, L replace15) const {
return lookup_16(simd8<L>::repeat_16(
replace0, replace1, replace2, replace3,
replace4, replace5, replace6, replace7,
replace8, replace9, replace10, replace11,
replace12, replace13, replace14, replace15
));
}
};
// Signed bytes
template<>
struct simd8<int8_t> : base8_numeric<int8_t> {
simdjson_inline simd8() : base8_numeric<int8_t>() {}
simdjson_inline simd8(const __m512i _value) : base8_numeric<int8_t>(_value) {}
// Splat constructor
simdjson_inline simd8(int8_t _value) : simd8(splat(_value)) {}
// Array constructor
simdjson_inline simd8(const int8_t values[64]) : simd8(load(values)) {}
// Member-by-member initialization
simdjson_inline simd8(
int8_t v0, int8_t v1, int8_t v2, int8_t v3, int8_t v4, int8_t v5, int8_t v6, int8_t v7,
int8_t v8, int8_t v9, int8_t v10, int8_t v11, int8_t v12, int8_t v13, int8_t v14, int8_t v15,
int8_t v16, int8_t v17, int8_t v18, int8_t v19, int8_t v20, int8_t v21, int8_t v22, int8_t v23,
int8_t v24, int8_t v25, int8_t v26, int8_t v27, int8_t v28, int8_t v29, int8_t v30, int8_t v31,
int8_t v32, int8_t v33, int8_t v34, int8_t v35, int8_t v36, int8_t v37, int8_t v38, int8_t v39,
int8_t v40, int8_t v41, int8_t v42, int8_t v43, int8_t v44, int8_t v45, int8_t v46, int8_t v47,
int8_t v48, int8_t v49, int8_t v50, int8_t v51, int8_t v52, int8_t v53, int8_t v54, int8_t v55,
int8_t v56, int8_t v57, int8_t v58, int8_t v59, int8_t v60, int8_t v61, int8_t v62, int8_t v63
) : simd8(_mm512_set_epi8(
v63, v62, v61, v60, v59, v58, v57, v56,
v55, v54, v53, v52, v51, v50, v49, v48,
v47, v46, v45, v44, v43, v42, v41, v40,
v39, v38, v37, v36, v35, v34, v33, v32,
v31, v30, v29, v28, v27, v26, v25, v24,
v23, v22, v21, v20, v19, v18, v17, v16,
v15, v14, v13, v12, v11, v10, v9, v8,
v7, v6, v5, v4, v3, v2, v1, v0
)) {}
// Repeat 16 values as many times as necessary (usually for lookup tables)
simdjson_inline static simd8<int8_t> repeat_16(
int8_t v0, int8_t v1, int8_t v2, int8_t v3, int8_t v4, int8_t v5, int8_t v6, int8_t v7,
int8_t v8, int8_t v9, int8_t v10, int8_t v11, int8_t v12, int8_t v13, int8_t v14, int8_t v15
) {
return simd8<int8_t>(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15,
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15,
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15,
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
);
}
// Order-sensitive comparisons
simdjson_inline simd8<int8_t> max_val(const simd8<int8_t> other) const { return _mm512_max_epi8(*this, other); }
simdjson_inline simd8<int8_t> min_val(const simd8<int8_t> other) const { return _mm512_min_epi8(*this, other); }
simdjson_inline simd8<bool> operator>(const simd8<int8_t> other) const { return _mm512_maskz_abs_epi8(_mm512_cmpgt_epi8_mask(*this, other),_mm512_set1_epi8(uint8_t(0x80))); }
simdjson_inline simd8<bool> operator<(const simd8<int8_t> other) const { return _mm512_maskz_abs_epi8(_mm512_cmpgt_epi8_mask(other, *this),_mm512_set1_epi8(uint8_t(0x80))); }
};
// Unsigned bytes
template<>
struct simd8<uint8_t>: base8_numeric<uint8_t> {
simdjson_inline simd8() : base8_numeric<uint8_t>() {}
simdjson_inline simd8(const __m512i _value) : base8_numeric<uint8_t>(_value) {}
// Splat constructor
simdjson_inline simd8(uint8_t _value) : simd8(splat(_value)) {}
// Array constructor
simdjson_inline simd8(const uint8_t values[64]) : simd8(load(values)) {}
// Member-by-member initialization
simdjson_inline simd8(
uint8_t v0, uint8_t v1, uint8_t v2, uint8_t v3, uint8_t v4, uint8_t v5, uint8_t v6, uint8_t v7,
uint8_t v8, uint8_t v9, uint8_t v10, uint8_t v11, uint8_t v12, uint8_t v13, uint8_t v14, uint8_t v15,
uint8_t v16, uint8_t v17, uint8_t v18, uint8_t v19, uint8_t v20, uint8_t v21, uint8_t v22, uint8_t v23,
uint8_t v24, uint8_t v25, uint8_t v26, uint8_t v27, uint8_t v28, uint8_t v29, uint8_t v30, uint8_t v31,
uint8_t v32, uint8_t v33, uint8_t v34, uint8_t v35, uint8_t v36, uint8_t v37, uint8_t v38, uint8_t v39,
uint8_t v40, uint8_t v41, uint8_t v42, uint8_t v43, uint8_t v44, uint8_t v45, uint8_t v46, uint8_t v47,
uint8_t v48, uint8_t v49, uint8_t v50, uint8_t v51, uint8_t v52, uint8_t v53, uint8_t v54, uint8_t v55,
uint8_t v56, uint8_t v57, uint8_t v58, uint8_t v59, uint8_t v60, uint8_t v61, uint8_t v62, uint8_t v63
) : simd8(_mm512_set_epi8(
v63, v62, v61, v60, v59, v58, v57, v56,
v55, v54, v53, v52, v51, v50, v49, v48,
v47, v46, v45, v44, v43, v42, v41, v40,
v39, v38, v37, v36, v35, v34, v33, v32,
v31, v30, v29, v28, v27, v26, v25, v24,
v23, v22, v21, v20, v19, v18, v17, v16,
v15, v14, v13, v12, v11, v10, v9, v8,
v7, v6, v5, v4, v3, v2, v1, v0
)) {}
// Repeat 16 values as many times as necessary (usually for lookup tables)
simdjson_inline static simd8<uint8_t> repeat_16(
uint8_t v0, uint8_t v1, uint8_t v2, uint8_t v3, uint8_t v4, uint8_t v5, uint8_t v6, uint8_t v7,
uint8_t v8, uint8_t v9, uint8_t v10, uint8_t v11, uint8_t v12, uint8_t v13, uint8_t v14, uint8_t v15
) {
return simd8<uint8_t>(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15,
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15,
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15,
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
);
}
// Saturated math
simdjson_inline simd8<uint8_t> saturating_add(const simd8<uint8_t> other) const { return _mm512_adds_epu8(*this, other); }
simdjson_inline simd8<uint8_t> saturating_sub(const simd8<uint8_t> other) const { return _mm512_subs_epu8(*this, other); }
// Order-specific operations
simdjson_inline simd8<uint8_t> max_val(const simd8<uint8_t> other) const { return _mm512_max_epu8(*this, other); }
simdjson_inline simd8<uint8_t> min_val(const simd8<uint8_t> other) const { return _mm512_min_epu8(other, *this); }
// Same as >, but only guarantees true is nonzero (< guarantees true = -1)
simdjson_inline simd8<uint8_t> gt_bits(const simd8<uint8_t> other) const { return this->saturating_sub(other); }
// Same as <, but only guarantees true is nonzero (< guarantees true = -1)
simdjson_inline simd8<uint8_t> lt_bits(const simd8<uint8_t> other) const { return other.saturating_sub(*this); }
simdjson_inline uint64_t operator<=(const simd8<uint8_t> other) const { return other.max_val(*this) == other; }
simdjson_inline uint64_t operator>=(const simd8<uint8_t> other) const { return other.min_val(*this) == other; }
simdjson_inline simd8<bool> operator>(const simd8<uint8_t> other) const { return this->gt_bits(other).any_bits_set(); }
simdjson_inline simd8<bool> operator<(const simd8<uint8_t> other) const { return this->lt_bits(other).any_bits_set(); }
// Bit-specific operations
simdjson_inline simd8<bool> bits_not_set() const { return _mm512_mask_blend_epi8(*this == uint8_t(0), _mm512_set1_epi8(0), _mm512_set1_epi8(-1)); }
simdjson_inline simd8<bool> bits_not_set(simd8<uint8_t> bits) const { return (*this & bits).bits_not_set(); }
simdjson_inline simd8<bool> any_bits_set() const { return ~this->bits_not_set(); }
simdjson_inline simd8<bool> any_bits_set(simd8<uint8_t> bits) const { return ~this->bits_not_set(bits); }
simdjson_inline bool is_ascii() const { return _mm512_movepi8_mask(*this) == 0; }
simdjson_inline bool bits_not_set_anywhere() const {
return !_mm512_test_epi8_mask(*this, *this);
}
simdjson_inline bool any_bits_set_anywhere() const { return !bits_not_set_anywhere(); }
simdjson_inline bool bits_not_set_anywhere(simd8<uint8_t> bits) const { return !_mm512_test_epi8_mask(*this, bits); }
simdjson_inline bool any_bits_set_anywhere(simd8<uint8_t> bits) const { return !bits_not_set_anywhere(bits); }
template<int N>
simdjson_inline simd8<uint8_t> shr() const { return simd8<uint8_t>(_mm512_srli_epi16(*this, N)) & uint8_t(0xFFu >> N); }
template<int N>
simdjson_inline simd8<uint8_t> shl() const { return simd8<uint8_t>(_mm512_slli_epi16(*this, N)) & uint8_t(0xFFu << N); }
// Get one of the bits and make a bitmask out of it.
// e.g. value.get_bit<7>() gets the high bit
template<int N>
simdjson_inline uint64_t get_bit() const { return _mm512_movepi8_mask(_mm512_slli_epi16(*this, 7-N)); }
};
template<typename T>
struct simd8x64 {
static constexpr int NUM_CHUNKS = 64 / sizeof(simd8<T>);
static_assert(NUM_CHUNKS == 1, "Icelake kernel should use one register per 64-byte block.");
const simd8<T> chunks[NUM_CHUNKS];
simd8x64(const simd8x64<T>& o) = delete; // no copy allowed
simd8x64<T>& operator=(const simd8<T>& other) = delete; // no assignment allowed
simd8x64() = delete; // no default constructor allowed
simdjson_inline simd8x64(const simd8<T> chunk0, const simd8<T> chunk1) : chunks{chunk0, chunk1} {}
simdjson_inline simd8x64(const simd8<T> chunk0) : chunks{chunk0} {}
simdjson_inline simd8x64(const T ptr[64]) : chunks{simd8<T>::load(ptr)} {}
simdjson_inline uint64_t compress(uint64_t mask, T * output) const {
this->chunks[0].compress(mask, output);
return 64 - count_ones(mask);
}
simdjson_inline void store(T ptr[64]) const {
this->chunks[0].store(ptr+sizeof(simd8<T>)*0);
}
simdjson_inline simd8<T> reduce_or() const {
return this->chunks[0];
}
simdjson_inline simd8x64<T> bit_or(const T m) const {
const simd8<T> mask = simd8<T>::splat(m);
return simd8x64<T>(
this->chunks[0] | mask
);
}
simdjson_inline uint64_t eq(const T m) const {
const simd8<T> mask = simd8<T>::splat(m);
return this->chunks[0] == mask;
}
simdjson_inline uint64_t eq(const simd8x64<uint8_t> &other) const {
return this->chunks[0] == other.chunks[0];
}
simdjson_inline uint64_t lteq(const T m) const {
const simd8<T> mask = simd8<T>::splat(m);
return this->chunks[0] <= mask;
}
}; // struct simd8x64<T>
} // namespace simd
} // unnamed namespace
} // namespace icelake
} // namespace simdjson
#endif // SIMDJSON_ICELAKE_SIMD_H
/* end file simdjson/icelake/simd.h */
/* including simdjson/icelake/stringparsing_defs.h: #include "simdjson/icelake/stringparsing_defs.h" */
/* begin file simdjson/icelake/stringparsing_defs.h */
#ifndef SIMDJSON_ICELAKE_STRINGPARSING_DEFS_H
#define SIMDJSON_ICELAKE_STRINGPARSING_DEFS_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/icelake/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/icelake/simd.h" */
/* amalgamation skipped (editor-only): #include "simdjson/icelake/bitmanipulation.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace icelake {
namespace {
using namespace simd;
// Holds backslashes and quotes locations.
struct backslash_and_quote {
public:
static constexpr uint32_t BYTES_PROCESSED = 64;
simdjson_inline static backslash_and_quote copy_and_find(const uint8_t *src, uint8_t *dst);
simdjson_inline bool has_quote_first() { return ((bs_bits - 1) & quote_bits) != 0; }
simdjson_inline bool has_backslash() { return ((quote_bits - 1) & bs_bits) != 0; }
simdjson_inline int quote_index() { return trailing_zeroes(quote_bits); }
simdjson_inline int backslash_index() { return trailing_zeroes(bs_bits); }
uint64_t bs_bits;
uint64_t quote_bits;
}; // struct backslash_and_quote
simdjson_inline backslash_and_quote backslash_and_quote::copy_and_find(const uint8_t *src, uint8_t *dst) {
// this can read up to 15 bytes beyond the buffer size, but we require
// SIMDJSON_PADDING of padding
static_assert(SIMDJSON_PADDING >= (BYTES_PROCESSED - 1), "backslash and quote finder must process fewer than SIMDJSON_PADDING bytes");
simd8<uint8_t> v(src);
// store to dest unconditionally - we can overwrite the bits we don't like later
v.store(dst);
return {
static_cast<uint64_t>(v == '\\'), // bs_bits
static_cast<uint64_t>(v == '"'), // quote_bits
};
}
} // unnamed namespace
} // namespace icelake
} // namespace simdjson
#endif // SIMDJSON_ICELAKE_STRINGPARSING_DEFS_H
/* end file simdjson/icelake/stringparsing_defs.h */
/* including simdjson/icelake/numberparsing_defs.h: #include "simdjson/icelake/numberparsing_defs.h" */
/* begin file simdjson/icelake/numberparsing_defs.h */
#ifndef SIMDJSON_ICELAKE_NUMBERPARSING_DEFS_H
#define SIMDJSON_ICELAKE_NUMBERPARSING_DEFS_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/icelake/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/icelake/intrinsics.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/numberparsing_tables.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace icelake {
namespace numberparsing {
static simdjson_inline uint32_t parse_eight_digits_unrolled(const uint8_t *chars) {
// this actually computes *16* values so we are being wasteful.
const __m128i ascii0 = _mm_set1_epi8('0');
const __m128i mul_1_10 =
_mm_setr_epi8(10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1);
const __m128i mul_1_100 = _mm_setr_epi16(100, 1, 100, 1, 100, 1, 100, 1);
const __m128i mul_1_10000 =
_mm_setr_epi16(10000, 1, 10000, 1, 10000, 1, 10000, 1);
const __m128i input = _mm_sub_epi8(
_mm_loadu_si128(reinterpret_cast<const __m128i *>(chars)), ascii0);
const __m128i t1 = _mm_maddubs_epi16(input, mul_1_10);
const __m128i t2 = _mm_madd_epi16(t1, mul_1_100);
const __m128i t3 = _mm_packus_epi32(t2, t2);
const __m128i t4 = _mm_madd_epi16(t3, mul_1_10000);
return _mm_cvtsi128_si32(
t4); // only captures the sum of the first 8 digits, drop the rest
}
/** @private */
simdjson_inline internal::value128 full_multiplication(uint64_t value1, uint64_t value2) {
internal::value128 answer;
#if SIMDJSON_REGULAR_VISUAL_STUDIO || SIMDJSON_IS_32BITS
#ifdef _M_ARM64
// ARM64 has native support for 64-bit multiplications, no need to emultate
answer.high = __umulh(value1, value2);
answer.low = value1 * value2;
#else
answer.low = _umul128(value1, value2, &answer.high); // _umul128 not available on ARM64
#endif // _M_ARM64
#else // SIMDJSON_REGULAR_VISUAL_STUDIO || SIMDJSON_IS_32BITS
__uint128_t r = (static_cast<__uint128_t>(value1)) * value2;
answer.low = uint64_t(r);
answer.high = uint64_t(r >> 64);
#endif
return answer;
}
} // namespace numberparsing
} // namespace icelake
} // namespace simdjson
#define SIMDJSON_SWAR_NUMBER_PARSING 1
#endif // SIMDJSON_ICELAKE_NUMBERPARSING_DEFS_H
/* end file simdjson/icelake/numberparsing_defs.h */
/* end file simdjson/icelake/begin.h */
/* including generic/amalgamated.h for icelake: #include <generic/amalgamated.h> */
/* begin file generic/amalgamated.h for icelake */
#if defined(SIMDJSON_CONDITIONAL_INCLUDE) && !defined(SIMDJSON_SRC_GENERIC_DEPENDENCIES_H)
#error generic/dependencies.h must be included before generic/amalgamated.h!
#endif
/* including generic/base.h for icelake: #include <generic/base.h> */
/* begin file generic/base.h for icelake */
#ifndef SIMDJSON_SRC_GENERIC_BASE_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_BASE_H */
/* amalgamation skipped (editor-only): #include <base.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/base.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace icelake {
namespace {
struct json_character_block;
} // unnamed namespace
} // namespace icelake
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_BASE_H
/* end file generic/base.h for icelake */
/* including generic/dom_parser_implementation.h for icelake: #include <generic/dom_parser_implementation.h> */
/* begin file generic/dom_parser_implementation.h for icelake */
#ifndef SIMDJSON_SRC_GENERIC_DOM_PARSER_IMPLEMENTATION_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_DOM_PARSER_IMPLEMENTATION_H */
/* amalgamation skipped (editor-only): #include <generic/base.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/dom_parser_implementation.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
// Interface a dom parser implementation must fulfill
namespace simdjson {
namespace icelake {
namespace {
simdjson_inline simd8<uint8_t> must_be_2_3_continuation(const simd8<uint8_t> prev2, const simd8<uint8_t> prev3);
simdjson_inline bool is_ascii(const simd8x64<uint8_t>& input);
} // unnamed namespace
} // namespace icelake
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_DOM_PARSER_IMPLEMENTATION_H
/* end file generic/dom_parser_implementation.h for icelake */
/* including generic/json_character_block.h for icelake: #include <generic/json_character_block.h> */
/* begin file generic/json_character_block.h for icelake */
#ifndef SIMDJSON_SRC_GENERIC_JSON_CHARACTER_BLOCK_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_JSON_CHARACTER_BLOCK_H */
/* amalgamation skipped (editor-only): #include <generic/base.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace icelake {
namespace {
struct json_character_block {
static simdjson_inline json_character_block classify(const simd::simd8x64<uint8_t>& in);
simdjson_inline uint64_t whitespace() const noexcept { return _whitespace; }
simdjson_inline uint64_t op() const noexcept { return _op; }
simdjson_inline uint64_t scalar() const noexcept { return ~(op() | whitespace()); }
uint64_t _whitespace;
uint64_t _op;
};
} // unnamed namespace
} // namespace icelake
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_JSON_CHARACTER_BLOCK_H
/* end file generic/json_character_block.h for icelake */
/* end file generic/amalgamated.h for icelake */
/* including generic/stage1/amalgamated.h for icelake: #include <generic/stage1/amalgamated.h> */
/* begin file generic/stage1/amalgamated.h for icelake */
// Stuff other things depend on
/* including generic/stage1/base.h for icelake: #include <generic/stage1/base.h> */
/* begin file generic/stage1/base.h for icelake */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_BASE_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_BASE_H */
/* amalgamation skipped (editor-only): #include <generic/base.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace icelake {
namespace {
namespace stage1 {
class bit_indexer;
template<size_t STEP_SIZE>
struct buf_block_reader;
struct json_block;
class json_minifier;
class json_scanner;
struct json_string_block;
class json_string_scanner;
class json_structural_indexer;
} // namespace stage1
namespace utf8_validation {
struct utf8_checker;
} // namespace utf8_validation
using utf8_validation::utf8_checker;
} // unnamed namespace
} // namespace icelake
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE1_BASE_H
/* end file generic/stage1/base.h for icelake */
/* including generic/stage1/buf_block_reader.h for icelake: #include <generic/stage1/buf_block_reader.h> */
/* begin file generic/stage1/buf_block_reader.h for icelake */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_BUF_BLOCK_READER_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_BUF_BLOCK_READER_H */
/* amalgamation skipped (editor-only): #include <generic/stage1/base.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#include <cstring>
namespace simdjson {
namespace icelake {
namespace {
namespace stage1 {
// Walks through a buffer in block-sized increments, loading the last part with spaces
template<size_t STEP_SIZE>
struct buf_block_reader {
public:
simdjson_inline buf_block_reader(const uint8_t *_buf, size_t _len);
simdjson_inline size_t block_index();
simdjson_inline bool has_full_block() const;
simdjson_inline const uint8_t *full_block() const;
/**
* Get the last block, padded with spaces.
*
* There will always be a last block, with at least 1 byte, unless len == 0 (in which case this
* function fills the buffer with spaces and returns 0. In particular, if len == STEP_SIZE there
* will be 0 full_blocks and 1 remainder block with STEP_SIZE bytes and no spaces for padding.
*
* @return the number of effective characters in the last block.
*/
simdjson_inline size_t get_remainder(uint8_t *dst) const;
simdjson_inline void advance();
private:
const uint8_t *buf;
const size_t len;
const size_t lenminusstep;
size_t idx;
};
// Routines to print masks and text for debugging bitmask operations
simdjson_unused static char * format_input_text_64(const uint8_t *text) {
static char buf[sizeof(simd8x64<uint8_t>) + 1];
for (size_t i=0; i<sizeof(simd8x64<uint8_t>); i++) {
buf[i] = int8_t(text[i]) < ' ' ? '_' : int8_t(text[i]);
}
buf[sizeof(simd8x64<uint8_t>)] = '\0';
return buf;
}
// Routines to print masks and text for debugging bitmask operations
simdjson_unused static char * format_input_text(const simd8x64<uint8_t>& in) {
static char buf[sizeof(simd8x64<uint8_t>) + 1];
in.store(reinterpret_cast<uint8_t*>(buf));
for (size_t i=0; i<sizeof(simd8x64<uint8_t>); i++) {
if (buf[i] < ' ') { buf[i] = '_'; }
}
buf[sizeof(simd8x64<uint8_t>)] = '\0';
return buf;
}
simdjson_unused static char * format_input_text(const simd8x64<uint8_t>& in, uint64_t mask) {
static char buf[sizeof(simd8x64<uint8_t>) + 1];
in.store(reinterpret_cast<uint8_t*>(buf));
for (size_t i=0; i<sizeof(simd8x64<uint8_t>); i++) {
if (buf[i] <= ' ') { buf[i] = '_'; }
if (!(mask & (size_t(1) << i))) { buf[i] = ' '; }
}
buf[sizeof(simd8x64<uint8_t>)] = '\0';
return buf;
}
simdjson_unused static char * format_mask(uint64_t mask) {
static char buf[sizeof(simd8x64<uint8_t>) + 1];
for (size_t i=0; i<64; i++) {
buf[i] = (mask & (size_t(1) << i)) ? 'X' : ' ';
}
buf[64] = '\0';
return buf;
}
template<size_t STEP_SIZE>
simdjson_inline buf_block_reader<STEP_SIZE>::buf_block_reader(const uint8_t *_buf, size_t _len) : buf{_buf}, len{_len}, lenminusstep{len < STEP_SIZE ? 0 : len - STEP_SIZE}, idx{0} {}
template<size_t STEP_SIZE>
simdjson_inline size_t buf_block_reader<STEP_SIZE>::block_index() { return idx; }
template<size_t STEP_SIZE>
simdjson_inline bool buf_block_reader<STEP_SIZE>::has_full_block() const {
return idx < lenminusstep;
}
template<size_t STEP_SIZE>
simdjson_inline const uint8_t *buf_block_reader<STEP_SIZE>::full_block() const {
return &buf[idx];
}
template<size_t STEP_SIZE>
simdjson_inline size_t buf_block_reader<STEP_SIZE>::get_remainder(uint8_t *dst) const {
if(len == idx) { return 0; } // memcpy(dst, null, 0) will trigger an error with some sanitizers
std::memset(dst, 0x20, STEP_SIZE); // std::memset STEP_SIZE because it's more efficient to write out 8 or 16 bytes at once.
std::memcpy(dst, buf + idx, len - idx);
return len - idx;
}
template<size_t STEP_SIZE>
simdjson_inline void buf_block_reader<STEP_SIZE>::advance() {
idx += STEP_SIZE;
}
} // namespace stage1
} // unnamed namespace
} // namespace icelake
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE1_BUF_BLOCK_READER_H
/* end file generic/stage1/buf_block_reader.h for icelake */
/* including generic/stage1/json_escape_scanner.h for icelake: #include <generic/stage1/json_escape_scanner.h> */
/* begin file generic/stage1/json_escape_scanner.h for icelake */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_JSON_ESCAPE_SCANNER_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_JSON_ESCAPE_SCANNER_H */
/* amalgamation skipped (editor-only): #include <generic/stage1/base.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/buf_block_reader.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace icelake {
namespace {
namespace stage1 {
/**
* Scans for escape characters in JSON, taking care with multiple backslashes (\\n vs. \n).
*/
struct json_escape_scanner {
/** The actual escape characters (the backslashes themselves). */
uint64_t next_is_escaped = 0ULL;
struct escaped_and_escape {
/**
* Mask of escaped characters.
*
* ```
* \n \\n \\\n \\\\n \
* 0100100010100101000
* n \ \ n \ \
* ```
*/
uint64_t escaped;
/**
* Mask of escape characters.
*
* ```
* \n \\n \\\n \\\\n \
* 1001000101001010001
* \ \ \ \ \ \ \
* ```
*/
uint64_t escape;
};
/**
* Get a mask of both escape and escaped characters (the characters following a backslash).
*
* @param potential_escape A mask of the character that can escape others (but could be
* escaped itself). e.g. block.eq('\\')
*/
simdjson_really_inline escaped_and_escape next(uint64_t backslash) noexcept {
#if !SIMDJSON_SKIP_BACKSLASH_SHORT_CIRCUIT
if (!backslash) { return {next_escaped_without_backslashes(), 0}; }
#endif
// | | Mask (shows characters instead of 1's) | Depth | Instructions |
// |--------------------------------|----------------------------------------|-------|---------------------|
// | string | `\\n_\\\n___\\\n___\\\\___\\\\__\\\` | | |
// | | ` even odd even odd odd` | | |
// | potential_escape | ` \ \\\ \\\ \\\\ \\\\ \\\` | 1 | 1 (backslash & ~first_is_escaped)
// | escape_and_terminal_code | ` \n \ \n \ \n \ \ \ \ \ \` | 5 | 5 (next_escape_and_terminal_code())
// | escaped | `\ \ n \ n \ \ \ \ \ ` X | 6 | 7 (escape_and_terminal_code ^ (potential_escape | first_is_escaped))
// | escape | ` \ \ \ \ \ \ \ \ \ \` | 6 | 8 (escape_and_terminal_code & backslash)
// | first_is_escaped | `\ ` | 7 (*) | 9 (escape >> 63) ()
// (*) this is not needed until the next iteration
uint64_t escape_and_terminal_code = next_escape_and_terminal_code(backslash & ~this->next_is_escaped);
uint64_t escaped = escape_and_terminal_code ^ (backslash | this->next_is_escaped);
uint64_t escape = escape_and_terminal_code & backslash;
this->next_is_escaped = escape >> 63;
return {escaped, escape};
}
private:
static constexpr const uint64_t ODD_BITS = 0xAAAAAAAAAAAAAAAAULL;
simdjson_really_inline uint64_t next_escaped_without_backslashes() noexcept {
uint64_t escaped = this->next_is_escaped;
this->next_is_escaped = 0;
return escaped;
}
/**
* Returns a mask of the next escape characters (masking out escaped backslashes), along with
* any non-backslash escape codes.
*
* \n \\n \\\n \\\\n returns:
* \n \ \ \n \ \
* 11 100 1011 10100
*
* You are expected to mask out the first bit yourself if the previous block had a trailing
* escape.
*
* & the result with potential_escape to get just the escape characters.
* ^ the result with (potential_escape | first_is_escaped) to get escaped characters.
*/
static simdjson_really_inline uint64_t next_escape_and_terminal_code(uint64_t potential_escape) noexcept {
// If we were to just shift and mask out any odd bits, we'd actually get a *half* right answer:
// any even-aligned backslash runs would be correct! Odd-aligned backslash runs would be
// inverted (\\\ would be 010 instead of 101).
//
// ```
// string: | ____\\\\_\\\\_____ |
// maybe_escaped | ODD | \ \ \ \ |
// even-aligned ^^^ ^^^^ odd-aligned
// ```
//
// Taking that into account, our basic strategy is:
//
// 1. Use subtraction to produce a mask with 1's for even-aligned runs and 0's for
// odd-aligned runs.
// 2. XOR all odd bits, which masks out the odd bits in even-aligned runs, and brings IN the
// odd bits in odd-aligned runs.
// 3. & with backslash to clean up any stray bits.
// runs are set to 0, and then XORing with "odd":
//
// | | Mask (shows characters instead of 1's) | Instructions |
// |--------------------------------|----------------------------------------|---------------------|
// | string | `\\n_\\\n___\\\n___\\\\___\\\\__\\\` |
// | | ` even odd even odd odd` |
// | maybe_escaped | ` n \\n \\n \\\_ \\\_ \\` X | 1 (potential_escape << 1)
// | maybe_escaped_and_odd | ` \n_ \\n _ \\\n_ _ \\\__ _\\\_ \\\` | 1 (maybe_escaped | odd)
// | even_series_codes_and_odd | ` n_\\\ _ n_ _\\\\ _ _ ` | 1 (maybe_escaped_and_odd - potential_escape)
// | escape_and_terminal_code | ` \n \ \n \ \n \ \ \ \ \ \` | 1 (^ odd)
//
// Escaped characters are characters following an escape.
uint64_t maybe_escaped = potential_escape << 1;
// To distinguish odd from even escape sequences, therefore, we turn on any *starting*
// escapes that are on an odd byte. (We actually bring in all odd bits, for speed.)
// - Odd runs of backslashes are 0000, and the code at the end ("n" in \n or \\n) is 1.
// - Odd runs of backslashes are 1111, and the code at the end ("n" in \n or \\n) is 0.
// - All other odd bytes are 1, and even bytes are 0.
uint64_t maybe_escaped_and_odd_bits = maybe_escaped | ODD_BITS;
uint64_t even_series_codes_and_odd_bits = maybe_escaped_and_odd_bits - potential_escape;
// Now we flip all odd bytes back with xor. This:
// - Makes odd runs of backslashes go from 0000 to 1010
// - Makes even runs of backslashes go from 1111 to 1010
// - Sets actually-escaped codes to 1 (the n in \n and \\n: \n = 11, \\n = 100)
// - Resets all other bytes to 0
return even_series_codes_and_odd_bits ^ ODD_BITS;
}
};
} // namespace stage1
} // unnamed namespace
} // namespace icelake
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE1_JSON_STRING_SCANNER_H
/* end file generic/stage1/json_escape_scanner.h for icelake */
/* including generic/stage1/json_string_scanner.h for icelake: #include <generic/stage1/json_string_scanner.h> */
/* begin file generic/stage1/json_string_scanner.h for icelake */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_JSON_STRING_SCANNER_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_JSON_STRING_SCANNER_H */
/* amalgamation skipped (editor-only): #include <generic/stage1/base.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/json_escape_scanner.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace icelake {
namespace {
namespace stage1 {
struct json_string_block {
// We spell out the constructors in the hope of resolving inlining issues with Visual Studio 2017
simdjson_really_inline json_string_block(uint64_t escaped, uint64_t quote, uint64_t in_string) :
_escaped(escaped), _quote(quote), _in_string(in_string) {}
// Escaped characters (characters following an escape() character)
simdjson_really_inline uint64_t escaped() const { return _escaped; }
// Real (non-backslashed) quotes
simdjson_really_inline uint64_t quote() const { return _quote; }
// Only characters inside the string (not including the quotes)
simdjson_really_inline uint64_t string_content() const { return _in_string & ~_quote; }
// Return a mask of whether the given characters are inside a string (only works on non-quotes)
simdjson_really_inline uint64_t non_quote_inside_string(uint64_t mask) const { return mask & _in_string; }
// Return a mask of whether the given characters are inside a string (only works on non-quotes)
simdjson_really_inline uint64_t non_quote_outside_string(uint64_t mask) const { return mask & ~_in_string; }
// Tail of string (everything except the start quote)
simdjson_really_inline uint64_t string_tail() const { return _in_string ^ _quote; }
// escaped characters (backslashed--does not include the hex characters after \u)
uint64_t _escaped;
// real quotes (non-escaped ones)
uint64_t _quote;
// string characters (includes start quote but not end quote)
uint64_t _in_string;
};
// Scans blocks for string characters, storing the state necessary to do so
class json_string_scanner {
public:
simdjson_really_inline json_string_block next(const simd::simd8x64<uint8_t>& in);
// Returns either UNCLOSED_STRING or SUCCESS
simdjson_really_inline error_code finish();
private:
// Scans for escape characters
json_escape_scanner escape_scanner{};
// Whether the last iteration was still inside a string (all 1's = true, all 0's = false).
uint64_t prev_in_string = 0ULL;
};
//
// Return a mask of all string characters plus end quotes.
//
// prev_escaped is overflow saying whether the next character is escaped.
// prev_in_string is overflow saying whether we're still in a string.
//
// Backslash sequences outside of quotes will be detected in stage 2.
//
simdjson_really_inline json_string_block json_string_scanner::next(const simd::simd8x64<uint8_t>& in) {
const uint64_t backslash = in.eq('\\');
const uint64_t escaped = escape_scanner.next(backslash).escaped;
const uint64_t quote = in.eq('"') & ~escaped;
//
// prefix_xor flips on bits inside the string (and flips off the end quote).
//
// Then we xor with prev_in_string: if we were in a string already, its effect is flipped
// (characters inside strings are outside, and characters outside strings are inside).
//
const uint64_t in_string = prefix_xor(quote) ^ prev_in_string;
//
// Check if we're still in a string at the end of the box so the next block will know
//
prev_in_string = uint64_t(static_cast<int64_t>(in_string) >> 63);
// Use ^ to turn the beginning quote off, and the end quote on.
// We are returning a function-local object so either we get a move constructor
// or we get copy elision.
return json_string_block(escaped, quote, in_string);
}
simdjson_really_inline error_code json_string_scanner::finish() {
if (prev_in_string) {
return UNCLOSED_STRING;
}
return SUCCESS;
}
} // namespace stage1
} // unnamed namespace
} // namespace icelake
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE1_JSON_STRING_SCANNER_H
/* end file generic/stage1/json_string_scanner.h for icelake */
/* including generic/stage1/utf8_lookup4_algorithm.h for icelake: #include <generic/stage1/utf8_lookup4_algorithm.h> */
/* begin file generic/stage1/utf8_lookup4_algorithm.h for icelake */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_UTF8_LOOKUP4_ALGORITHM_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_UTF8_LOOKUP4_ALGORITHM_H */
/* amalgamation skipped (editor-only): #include <generic/stage1/base.h> */
/* amalgamation skipped (editor-only): #include <generic/dom_parser_implementation.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace icelake {
namespace {
namespace utf8_validation {
using namespace simd;
simdjson_inline simd8<uint8_t> check_special_cases(const simd8<uint8_t> input, const simd8<uint8_t> prev1) {
// Bit 0 = Too Short (lead byte/ASCII followed by lead byte/ASCII)
// Bit 1 = Too Long (ASCII followed by continuation)
// Bit 2 = Overlong 3-byte
// Bit 4 = Surrogate
// Bit 5 = Overlong 2-byte
// Bit 7 = Two Continuations
constexpr const uint8_t TOO_SHORT = 1<<0; // 11______ 0_______
// 11______ 11______
constexpr const uint8_t TOO_LONG = 1<<1; // 0_______ 10______
constexpr const uint8_t OVERLONG_3 = 1<<2; // 11100000 100_____
constexpr const uint8_t SURROGATE = 1<<4; // 11101101 101_____
constexpr const uint8_t OVERLONG_2 = 1<<5; // 1100000_ 10______
constexpr const uint8_t TWO_CONTS = 1<<7; // 10______ 10______
constexpr const uint8_t TOO_LARGE = 1<<3; // 11110100 1001____
// 11110100 101_____
// 11110101 1001____
// 11110101 101_____
// 1111011_ 1001____
// 1111011_ 101_____
// 11111___ 1001____
// 11111___ 101_____
constexpr const uint8_t TOO_LARGE_1000 = 1<<6;
// 11110101 1000____
// 1111011_ 1000____
// 11111___ 1000____
constexpr const uint8_t OVERLONG_4 = 1<<6; // 11110000 1000____
const simd8<uint8_t> byte_1_high = prev1.shr<4>().lookup_16<uint8_t>(
// 0_______ ________ <ASCII in byte 1>
TOO_LONG, TOO_LONG, TOO_LONG, TOO_LONG,
TOO_LONG, TOO_LONG, TOO_LONG, TOO_LONG,
// 10______ ________ <continuation in byte 1>
TWO_CONTS, TWO_CONTS, TWO_CONTS, TWO_CONTS,
// 1100____ ________ <two byte lead in byte 1>
TOO_SHORT | OVERLONG_2,
// 1101____ ________ <two byte lead in byte 1>
TOO_SHORT,
// 1110____ ________ <three byte lead in byte 1>
TOO_SHORT | OVERLONG_3 | SURROGATE,
// 1111____ ________ <four+ byte lead in byte 1>
TOO_SHORT | TOO_LARGE | TOO_LARGE_1000 | OVERLONG_4
);
constexpr const uint8_t CARRY = TOO_SHORT | TOO_LONG | TWO_CONTS; // These all have ____ in byte 1 .
const simd8<uint8_t> byte_1_low = (prev1 & 0x0F).lookup_16<uint8_t>(
// ____0000 ________
CARRY | OVERLONG_3 | OVERLONG_2 | OVERLONG_4,
// ____0001 ________
CARRY | OVERLONG_2,
// ____001_ ________
CARRY,
CARRY,
// ____0100 ________
CARRY | TOO_LARGE,
// ____0101 ________
CARRY | TOO_LARGE | TOO_LARGE_1000,
// ____011_ ________
CARRY | TOO_LARGE | TOO_LARGE_1000,
CARRY | TOO_LARGE | TOO_LARGE_1000,
// ____1___ ________
CARRY | TOO_LARGE | TOO_LARGE_1000,
CARRY | TOO_LARGE | TOO_LARGE_1000,
CARRY | TOO_LARGE | TOO_LARGE_1000,
CARRY | TOO_LARGE | TOO_LARGE_1000,
CARRY | TOO_LARGE | TOO_LARGE_1000,
// ____1101 ________
CARRY | TOO_LARGE | TOO_LARGE_1000 | SURROGATE,
CARRY | TOO_LARGE | TOO_LARGE_1000,
CARRY | TOO_LARGE | TOO_LARGE_1000
);
const simd8<uint8_t> byte_2_high = input.shr<4>().lookup_16<uint8_t>(
// ________ 0_______ <ASCII in byte 2>
TOO_SHORT, TOO_SHORT, TOO_SHORT, TOO_SHORT,
TOO_SHORT, TOO_SHORT, TOO_SHORT, TOO_SHORT,
// ________ 1000____
TOO_LONG | OVERLONG_2 | TWO_CONTS | OVERLONG_3 | TOO_LARGE_1000 | OVERLONG_4,
// ________ 1001____
TOO_LONG | OVERLONG_2 | TWO_CONTS | OVERLONG_3 | TOO_LARGE,
// ________ 101_____
TOO_LONG | OVERLONG_2 | TWO_CONTS | SURROGATE | TOO_LARGE,
TOO_LONG | OVERLONG_2 | TWO_CONTS | SURROGATE | TOO_LARGE,
// ________ 11______
TOO_SHORT, TOO_SHORT, TOO_SHORT, TOO_SHORT
);
return (byte_1_high & byte_1_low & byte_2_high);
}
simdjson_inline simd8<uint8_t> check_multibyte_lengths(const simd8<uint8_t> input,
const simd8<uint8_t> prev_input, const simd8<uint8_t> sc) {
simd8<uint8_t> prev2 = input.prev<2>(prev_input);
simd8<uint8_t> prev3 = input.prev<3>(prev_input);
simd8<uint8_t> must23 = must_be_2_3_continuation(prev2, prev3);
simd8<uint8_t> must23_80 = must23 & uint8_t(0x80);
return must23_80 ^ sc;
}
//
// Return nonzero if there are incomplete multibyte characters at the end of the block:
// e.g. if there is a 4-byte character, but it's 3 bytes from the end.
//
simdjson_inline simd8<uint8_t> is_incomplete(const simd8<uint8_t> input) {
// If the previous input's last 3 bytes match this, they're too short (they ended at EOF):
// ... 1111____ 111_____ 11______
#if SIMDJSON_IMPLEMENTATION_ICELAKE
static const uint8_t max_array[64] = {
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 0xf0u-1, 0xe0u-1, 0xc0u-1
};
#else
static const uint8_t max_array[32] = {
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 0xf0u-1, 0xe0u-1, 0xc0u-1
};
#endif
const simd8<uint8_t> max_value(&max_array[sizeof(max_array)-sizeof(simd8<uint8_t>)]);
return input.gt_bits(max_value);
}
struct utf8_checker {
// If this is nonzero, there has been a UTF-8 error.
simd8<uint8_t> error;
// The last input we received
simd8<uint8_t> prev_input_block;
// Whether the last input we received was incomplete (used for ASCII fast path)
simd8<uint8_t> prev_incomplete;
//
// Check whether the current bytes are valid UTF-8.
//
simdjson_inline void check_utf8_bytes(const simd8<uint8_t> input, const simd8<uint8_t> prev_input) {
// Flip prev1...prev3 so we can easily determine if they are 2+, 3+ or 4+ lead bytes
// (2, 3, 4-byte leads become large positive numbers instead of small negative numbers)
simd8<uint8_t> prev1 = input.prev<1>(prev_input);
simd8<uint8_t> sc = check_special_cases(input, prev1);
this->error |= check_multibyte_lengths(input, prev_input, sc);
}
// The only problem that can happen at EOF is that a multibyte character is too short
// or a byte value too large in the last bytes: check_special_cases only checks for bytes
// too large in the first of two bytes.
simdjson_inline void check_eof() {
// If the previous block had incomplete UTF-8 characters at the end, an ASCII block can't
// possibly finish them.
this->error |= this->prev_incomplete;
}
simdjson_inline void check_next_input(const simd8x64<uint8_t>& input) {
if(simdjson_likely(is_ascii(input))) {
this->error |= this->prev_incomplete;
} else {
// you might think that a for-loop would work, but under Visual Studio, it is not good enough.
static_assert((simd8x64<uint8_t>::NUM_CHUNKS == 1)
||(simd8x64<uint8_t>::NUM_CHUNKS == 2)
|| (simd8x64<uint8_t>::NUM_CHUNKS == 4),
"We support one, two or four chunks per 64-byte block.");
SIMDJSON_IF_CONSTEXPR (simd8x64<uint8_t>::NUM_CHUNKS == 1) {
this->check_utf8_bytes(input.chunks[0], this->prev_input_block);
} else SIMDJSON_IF_CONSTEXPR (simd8x64<uint8_t>::NUM_CHUNKS == 2) {
this->check_utf8_bytes(input.chunks[0], this->prev_input_block);
this->check_utf8_bytes(input.chunks[1], input.chunks[0]);
} else SIMDJSON_IF_CONSTEXPR (simd8x64<uint8_t>::NUM_CHUNKS == 4) {
this->check_utf8_bytes(input.chunks[0], this->prev_input_block);
this->check_utf8_bytes(input.chunks[1], input.chunks[0]);
this->check_utf8_bytes(input.chunks[2], input.chunks[1]);
this->check_utf8_bytes(input.chunks[3], input.chunks[2]);
}
this->prev_incomplete = is_incomplete(input.chunks[simd8x64<uint8_t>::NUM_CHUNKS-1]);
this->prev_input_block = input.chunks[simd8x64<uint8_t>::NUM_CHUNKS-1];
}
}
// do not forget to call check_eof!
simdjson_inline error_code errors() {
return this->error.any_bits_set_anywhere() ? error_code::UTF8_ERROR : error_code::SUCCESS;
}
}; // struct utf8_checker
} // namespace utf8_validation
} // unnamed namespace
} // namespace icelake
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE1_UTF8_LOOKUP4_ALGORITHM_H
/* end file generic/stage1/utf8_lookup4_algorithm.h for icelake */
/* including generic/stage1/json_scanner.h for icelake: #include <generic/stage1/json_scanner.h> */
/* begin file generic/stage1/json_scanner.h for icelake */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_JSON_SCANNER_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_JSON_SCANNER_H */
/* amalgamation skipped (editor-only): #include <generic/stage1/base.h> */
/* amalgamation skipped (editor-only): #include <generic/json_character_block.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/json_string_scanner.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace icelake {
namespace {
namespace stage1 {
/**
* A block of scanned json, with information on operators and scalars.
*
* We seek to identify pseudo-structural characters. Anything that is inside
* a string must be omitted (hence & ~_string.string_tail()).
* Otherwise, pseudo-structural characters come in two forms.
* 1. We have the structural characters ([,],{,},:, comma). The
* term 'structural character' is from the JSON RFC.
* 2. We have the 'scalar pseudo-structural characters'.
* Scalars are quotes, and any character except structural characters and white space.
*
* To identify the scalar pseudo-structural characters, we must look at what comes
* before them: it must be a space, a quote or a structural characters.
* Starting with simdjson v0.3, we identify them by
* negation: we identify everything that is followed by a non-quote scalar,
* and we negate that. Whatever remains must be a 'scalar pseudo-structural character'.
*/
struct json_block {
public:
// We spell out the constructors in the hope of resolving inlining issues with Visual Studio 2017
simdjson_inline json_block(json_string_block&& string, json_character_block characters, uint64_t follows_potential_nonquote_scalar) :
_string(std::move(string)), _characters(characters), _follows_potential_nonquote_scalar(follows_potential_nonquote_scalar) {}
simdjson_inline json_block(json_string_block string, json_character_block characters, uint64_t follows_potential_nonquote_scalar) :
_string(string), _characters(characters), _follows_potential_nonquote_scalar(follows_potential_nonquote_scalar) {}
/**
* The start of structurals.
* In simdjson prior to v0.3, these were called the pseudo-structural characters.
**/
simdjson_inline uint64_t structural_start() const noexcept { return potential_structural_start() & ~_string.string_tail(); }
/** All JSON whitespace (i.e. not in a string) */
simdjson_inline uint64_t whitespace() const noexcept { return non_quote_outside_string(_characters.whitespace()); }
// Helpers
/** Whether the given characters are inside a string (only works on non-quotes) */
simdjson_inline uint64_t non_quote_inside_string(uint64_t mask) const noexcept { return _string.non_quote_inside_string(mask); }
/** Whether the given characters are outside a string (only works on non-quotes) */
simdjson_inline uint64_t non_quote_outside_string(uint64_t mask) const noexcept { return _string.non_quote_outside_string(mask); }
// string and escape characters
json_string_block _string;
// whitespace, structural characters ('operators'), scalars
json_character_block _characters;
// whether the previous character was a scalar
uint64_t _follows_potential_nonquote_scalar;
private:
// Potential structurals (i.e. disregarding strings)
/**
* structural elements ([,],{,},:, comma) plus scalar starts like 123, true and "abc".
* They may reside inside a string.
**/
simdjson_inline uint64_t potential_structural_start() const noexcept { return _characters.op() | potential_scalar_start(); }
/**
* The start of non-operator runs, like 123, true and "abc".
* It main reside inside a string.
**/
simdjson_inline uint64_t potential_scalar_start() const noexcept {
// The term "scalar" refers to anything except structural characters and white space
// (so letters, numbers, quotes).
// Whenever it is preceded by something that is not a structural element ({,},[,],:, ") nor a white-space
// then we know that it is irrelevant structurally.
return _characters.scalar() & ~follows_potential_scalar();
}
/**
* Whether the given character is immediately after a non-operator like 123, true.
* The characters following a quote are not included.
*/
simdjson_inline uint64_t follows_potential_scalar() const noexcept {
// _follows_potential_nonquote_scalar: is defined as marking any character that follows a character
// that is not a structural element ({,},[,],:, comma) nor a quote (") and that is not a
// white space.
// It is understood that within quoted region, anything at all could be marked (irrelevant).
return _follows_potential_nonquote_scalar;
}
};
/**
* Scans JSON for important bits: structural characters or 'operators', strings, and scalars.
*
* The scanner starts by calculating two distinct things:
* - string characters (taking \" into account)
* - structural characters or 'operators' ([]{},:, comma)
* and scalars (runs of non-operators like 123, true and "abc")
*
* To minimize data dependency (a key component of the scanner's speed), it finds these in parallel:
* in particular, the operator/scalar bit will find plenty of things that are actually part of
* strings. When we're done, json_block will fuse the two together by masking out tokens that are
* part of a string.
*/
class json_scanner {
public:
json_scanner() = default;
simdjson_inline json_block next(const simd::simd8x64<uint8_t>& in);
// Returns either UNCLOSED_STRING or SUCCESS
simdjson_inline error_code finish();
private:
// Whether the last character of the previous iteration is part of a scalar token
// (anything except whitespace or a structural character/'operator').
uint64_t prev_scalar = 0ULL;
json_string_scanner string_scanner{};
};
//
// Check if the current character immediately follows a matching character.
//
// For example, this checks for quotes with backslashes in front of them:
//
// const uint64_t backslashed_quote = in.eq('"') & immediately_follows(in.eq('\'), prev_backslash);
//
simdjson_inline uint64_t follows(const uint64_t match, uint64_t &overflow) {
const uint64_t result = match << 1 | overflow;
overflow = match >> 63;
return result;
}
simdjson_inline json_block json_scanner::next(const simd::simd8x64<uint8_t>& in) {
json_string_block strings = string_scanner.next(in);
// identifies the white-space and the structural characters
json_character_block characters = json_character_block::classify(in);
// The term "scalar" refers to anything except structural characters and white space
// (so letters, numbers, quotes).
// We want follows_scalar to mark anything that follows a non-quote scalar (so letters and numbers).
//
// A terminal quote should either be followed by a structural character (comma, brace, bracket, colon)
// or nothing. However, we still want ' "a string"true ' to mark the 't' of 'true' as a potential
// pseudo-structural character just like we would if we had ' "a string" true '; otherwise we
// may need to add an extra check when parsing strings.
//
// Performance: there are many ways to skin this cat.
const uint64_t nonquote_scalar = characters.scalar() & ~strings.quote();
uint64_t follows_nonquote_scalar = follows(nonquote_scalar, prev_scalar);
// We are returning a function-local object so either we get a move constructor
// or we get copy elision.
return json_block(
strings,// strings is a function-local object so either it moves or the copy is elided.
characters,
follows_nonquote_scalar
);
}
simdjson_inline error_code json_scanner::finish() {
return string_scanner.finish();
}
} // namespace stage1
} // unnamed namespace
} // namespace icelake
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE1_JSON_SCANNER_H
/* end file generic/stage1/json_scanner.h for icelake */
// All other declarations
/* including generic/stage1/find_next_document_index.h for icelake: #include <generic/stage1/find_next_document_index.h> */
/* begin file generic/stage1/find_next_document_index.h for icelake */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_FIND_NEXT_DOCUMENT_INDEX_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_FIND_NEXT_DOCUMENT_INDEX_H */
/* amalgamation skipped (editor-only): #include <generic/stage1/base.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/dom_parser_implementation.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace icelake {
namespace {
namespace stage1 {
/**
* This algorithm is used to quickly identify the last structural position that
* makes up a complete document.
*
* It does this by going backwards and finding the last *document boundary* (a
* place where one value follows another without a comma between them). If the
* last document (the characters after the boundary) has an equal number of
* start and end brackets, it is considered complete.
*
* Simply put, we iterate over the structural characters, starting from
* the end. We consider that we found the end of a JSON document when the
* first element of the pair is NOT one of these characters: '{' '[' ':' ','
* and when the second element is NOT one of these characters: '}' ']' ':' ','.
*
* This simple comparison works most of the time, but it does not cover cases
* where the batch's structural indexes contain a perfect amount of documents.
* In such a case, we do not have access to the structural index which follows
* the last document, therefore, we do not have access to the second element in
* the pair, and that means we cannot identify the last document. To fix this
* issue, we keep a count of the open and closed curly/square braces we found
* while searching for the pair. When we find a pair AND the count of open and
* closed curly/square braces is the same, we know that we just passed a
* complete document, therefore the last json buffer location is the end of the
* batch.
*/
simdjson_inline uint32_t find_next_document_index(dom_parser_implementation &parser) {
// Variant: do not count separately, just figure out depth
if(parser.n_structural_indexes == 0) { return 0; }
auto arr_cnt = 0;
auto obj_cnt = 0;
for (auto i = parser.n_structural_indexes - 1; i > 0; i--) {
auto idxb = parser.structural_indexes[i];
switch (parser.buf[idxb]) {
case ':':
case ',':
continue;
case '}':
obj_cnt--;
continue;
case ']':
arr_cnt--;
continue;
case '{':
obj_cnt++;
break;
case '[':
arr_cnt++;
break;
}
auto idxa = parser.structural_indexes[i - 1];
switch (parser.buf[idxa]) {
case '{':
case '[':
case ':':
case ',':
continue;
}
// Last document is complete, so the next document will appear after!
if (!arr_cnt && !obj_cnt) {
return parser.n_structural_indexes;
}
// Last document is incomplete; mark the document at i + 1 as the next one
return i;
}
// If we made it to the end, we want to finish counting to see if we have a full document.
switch (parser.buf[parser.structural_indexes[0]]) {
case '}':
obj_cnt--;
break;
case ']':
arr_cnt--;
break;
case '{':
obj_cnt++;
break;
case '[':
arr_cnt++;
break;
}
if (!arr_cnt && !obj_cnt) {
// We have a complete document.
return parser.n_structural_indexes;
}
return 0;
}
} // namespace stage1
} // unnamed namespace
} // namespace icelake
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE1_FIND_NEXT_DOCUMENT_INDEX_H
/* end file generic/stage1/find_next_document_index.h for icelake */
/* including generic/stage1/json_minifier.h for icelake: #include <generic/stage1/json_minifier.h> */
/* begin file generic/stage1/json_minifier.h for icelake */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_JSON_MINIFIER_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_JSON_MINIFIER_H */
/* amalgamation skipped (editor-only): #include <generic/stage1/base.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/json_scanner.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/buf_block_reader.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
// This file contains the common code every implementation uses in stage1
// It is intended to be included multiple times and compiled multiple times
// We assume the file in which it is included already includes
// "simdjson/stage1.h" (this simplifies amalgation)
namespace simdjson {
namespace icelake {
namespace {
namespace stage1 {
class json_minifier {
public:
template<size_t STEP_SIZE>
static error_code minify(const uint8_t *buf, size_t len, uint8_t *dst, size_t &dst_len) noexcept;
private:
simdjson_inline json_minifier(uint8_t *_dst)
: dst{_dst}
{}
template<size_t STEP_SIZE>
simdjson_inline void step(const uint8_t *block_buf, buf_block_reader<STEP_SIZE> &reader) noexcept;
simdjson_inline void next(const simd::simd8x64<uint8_t>& in, const json_block& block);
simdjson_inline error_code finish(uint8_t *dst_start, size_t &dst_len);
json_scanner scanner{};
uint8_t *dst;
};
simdjson_inline void json_minifier::next(const simd::simd8x64<uint8_t>& in, const json_block& block) {
uint64_t mask = block.whitespace();
dst += in.compress(mask, dst);
}
simdjson_inline error_code json_minifier::finish(uint8_t *dst_start, size_t &dst_len) {
error_code error = scanner.finish();
if (error) { dst_len = 0; return error; }
dst_len = dst - dst_start;
return SUCCESS;
}
template<>
simdjson_inline void json_minifier::step<128>(const uint8_t *block_buf, buf_block_reader<128> &reader) noexcept {
simd::simd8x64<uint8_t> in_1(block_buf);
simd::simd8x64<uint8_t> in_2(block_buf+64);
json_block block_1 = scanner.next(in_1);
json_block block_2 = scanner.next(in_2);
this->next(in_1, block_1);
this->next(in_2, block_2);
reader.advance();
}
template<>
simdjson_inline void json_minifier::step<64>(const uint8_t *block_buf, buf_block_reader<64> &reader) noexcept {
simd::simd8x64<uint8_t> in_1(block_buf);
json_block block_1 = scanner.next(in_1);
this->next(block_buf, block_1);
reader.advance();
}
template<size_t STEP_SIZE>
error_code json_minifier::minify(const uint8_t *buf, size_t len, uint8_t *dst, size_t &dst_len) noexcept {
buf_block_reader<STEP_SIZE> reader(buf, len);
json_minifier minifier(dst);
// Index the first n-1 blocks
while (reader.has_full_block()) {
minifier.step<STEP_SIZE>(reader.full_block(), reader);
}
// Index the last (remainder) block, padded with spaces
uint8_t block[STEP_SIZE];
size_t remaining_bytes = reader.get_remainder(block);
if (remaining_bytes > 0) {
// We do not want to write directly to the output stream. Rather, we write
// to a local buffer (for safety).
uint8_t out_block[STEP_SIZE];
uint8_t * const guarded_dst{minifier.dst};
minifier.dst = out_block;
minifier.step<STEP_SIZE>(block, reader);
size_t to_write = minifier.dst - out_block;
// In some cases, we could be enticed to consider the padded spaces
// as part of the string. This is fine as long as we do not write more
// than we consumed.
if(to_write > remaining_bytes) { to_write = remaining_bytes; }
memcpy(guarded_dst, out_block, to_write);
minifier.dst = guarded_dst + to_write;
}
return minifier.finish(dst, dst_len);
}
} // namespace stage1
} // unnamed namespace
} // namespace icelake
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE1_JSON_MINIFIER_H
/* end file generic/stage1/json_minifier.h for icelake */
/* including generic/stage1/json_structural_indexer.h for icelake: #include <generic/stage1/json_structural_indexer.h> */
/* begin file generic/stage1/json_structural_indexer.h for icelake */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_JSON_STRUCTURAL_INDEXER_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_JSON_STRUCTURAL_INDEXER_H */
/* amalgamation skipped (editor-only): #include <generic/stage1/base.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/utf8_lookup4_algorithm.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/buf_block_reader.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/json_string_scanner.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/json_scanner.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/json_minifier.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/find_next_document_index.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
// This file contains the common code every implementation uses in stage1
// It is intended to be included multiple times and compiled multiple times
// We assume the file in which it is included already includes
// "simdjson/stage1.h" (this simplifies amalgation)
namespace simdjson {
namespace icelake {
namespace {
namespace stage1 {
class bit_indexer {
public:
uint32_t *tail;
simdjson_inline bit_indexer(uint32_t *index_buf) : tail(index_buf) {}
#if SIMDJSON_PREFER_REVERSE_BITS
/**
* ARM lacks a fast trailing zero instruction, but it has a fast
* bit reversal instruction and a fast leading zero instruction.
* Thus it may be profitable to reverse the bits (once) and then
* to rely on a sequence of instructions that call the leading
* zero instruction.
*
* Performance notes:
* The chosen routine is not optimal in terms of data dependency
* since zero_leading_bit might require two instructions. However,
* it tends to minimize the total number of instructions which is
* beneficial.
*/
simdjson_inline void write_index(uint32_t idx, uint64_t& rev_bits, int i) {
int lz = leading_zeroes(rev_bits);
this->tail[i] = static_cast<uint32_t>(idx) + lz;
rev_bits = zero_leading_bit(rev_bits, lz);
}
#else
/**
* Under recent x64 systems, we often have both a fast trailing zero
* instruction and a fast 'clear-lower-bit' instruction so the following
* algorithm can be competitive.
*/
simdjson_inline void write_index(uint32_t idx, uint64_t& bits, int i) {
this->tail[i] = idx + trailing_zeroes(bits);
bits = clear_lowest_bit(bits);
}
#endif // SIMDJSON_PREFER_REVERSE_BITS
template <int START, int N>
simdjson_inline int write_indexes(uint32_t idx, uint64_t& bits) {
write_index(idx, bits, START);
SIMDJSON_IF_CONSTEXPR (N > 1) {
write_indexes<(N-1>0?START+1:START), (N-1>=0?N-1:1)>(idx, bits);
}
return START+N;
}
template <int START, int END, int STEP>
simdjson_inline int write_indexes_stepped(uint32_t idx, uint64_t& bits, int cnt) {
write_indexes<START, STEP>(idx, bits);
SIMDJSON_IF_CONSTEXPR ((START+STEP) < END) {
if (simdjson_unlikely((START+STEP) < cnt)) {
write_indexes_stepped<(START+STEP<END?START+STEP:END), END, STEP>(idx, bits, cnt);
}
}
return ((END-START) % STEP) == 0 ? END : (END-START) - ((END-START) % STEP) + STEP;
}
// flatten out values in 'bits' assuming that they are are to have values of idx
// plus their position in the bitvector, and store these indexes at
// base_ptr[base] incrementing base as we go
// will potentially store extra values beyond end of valid bits, so base_ptr
// needs to be large enough to handle this
//
// If the kernel sets SIMDJSON_GENERIC_JSON_STRUCTURAL_INDEXER_CUSTOM_BIT_INDEXER, then it
// will provide its own version of the code.
#ifdef SIMDJSON_GENERIC_JSON_STRUCTURAL_INDEXER_CUSTOM_BIT_INDEXER
simdjson_inline void write(uint32_t idx, uint64_t bits);
#else
simdjson_inline void write(uint32_t idx, uint64_t bits) {
// In some instances, the next branch is expensive because it is mispredicted.
// Unfortunately, in other cases,
// it helps tremendously.
if (bits == 0)
return;
int cnt = static_cast<int>(count_ones(bits));
#if SIMDJSON_PREFER_REVERSE_BITS
bits = reverse_bits(bits);
#endif
#ifdef SIMDJSON_STRUCTURAL_INDEXER_STEP
static constexpr const int STEP = SIMDJSON_STRUCTURAL_INDEXER_STEP;
#else
static constexpr const int STEP = 4;
#endif
static constexpr const int STEP_UNTIL = 24;
write_indexes_stepped<0, STEP_UNTIL, STEP>(idx, bits, cnt);
SIMDJSON_IF_CONSTEXPR (STEP_UNTIL < 64) {
if (simdjson_unlikely(STEP_UNTIL < cnt)) {
for (int i=STEP_UNTIL; i<cnt; i++) {
write_index(idx, bits, i);
}
}
}
this->tail += cnt;
}
#endif // SIMDJSON_GENERIC_JSON_STRUCTURAL_INDEXER_CUSTOM_BIT_INDEXER
};
class json_structural_indexer {
public:
/**
* Find the important bits of JSON in a 128-byte chunk, and add them to structural_indexes.
*
* @param partial Setting the partial parameter to true allows the find_structural_bits to
* tolerate unclosed strings. The caller should still ensure that the input is valid UTF-8. If
* you are processing substrings, you may want to call on a function like trimmed_length_safe_utf8.
*/
template<size_t STEP_SIZE>
static error_code index(const uint8_t *buf, size_t len, dom_parser_implementation &parser, stage1_mode partial) noexcept;
private:
simdjson_inline json_structural_indexer(uint32_t *structural_indexes);
template<size_t STEP_SIZE>
simdjson_inline void step(const uint8_t *block, buf_block_reader<STEP_SIZE> &reader) noexcept;
simdjson_inline void next(const simd::simd8x64<uint8_t>& in, const json_block& block, size_t idx);
simdjson_inline error_code finish(dom_parser_implementation &parser, size_t idx, size_t len, stage1_mode partial);
json_scanner scanner{};
utf8_checker checker{};
bit_indexer indexer;
uint64_t prev_structurals = 0;
uint64_t unescaped_chars_error = 0;
};
simdjson_inline json_structural_indexer::json_structural_indexer(uint32_t *structural_indexes) : indexer{structural_indexes} {}
// Skip the last character if it is partial
simdjson_inline size_t trim_partial_utf8(const uint8_t *buf, size_t len) {
if (simdjson_unlikely(len < 3)) {
switch (len) {
case 2:
if (buf[len-1] >= 0xc0) { return len-1; } // 2-, 3- and 4-byte characters with only 1 byte left
if (buf[len-2] >= 0xe0) { return len-2; } // 3- and 4-byte characters with only 2 bytes left
return len;
case 1:
if (buf[len-1] >= 0xc0) { return len-1; } // 2-, 3- and 4-byte characters with only 1 byte left
return len;
case 0:
return len;
}
}
if (buf[len-1] >= 0xc0) { return len-1; } // 2-, 3- and 4-byte characters with only 1 byte left
if (buf[len-2] >= 0xe0) { return len-2; } // 3- and 4-byte characters with only 1 byte left
if (buf[len-3] >= 0xf0) { return len-3; } // 4-byte characters with only 3 bytes left
return len;
}
//
// PERF NOTES:
// We pipe 2 inputs through these stages:
// 1. Load JSON into registers. This takes a long time and is highly parallelizable, so we load
// 2 inputs' worth at once so that by the time step 2 is looking for them input, it's available.
// 2. Scan the JSON for critical data: strings, scalars and operators. This is the critical path.
// The output of step 1 depends entirely on this information. These functions don't quite use
// up enough CPU: the second half of the functions is highly serial, only using 1 execution core
// at a time. The second input's scans has some dependency on the first ones finishing it, but
// they can make a lot of progress before they need that information.
// 3. Step 1 does not use enough capacity, so we run some extra stuff while we're waiting for that
// to finish: utf-8 checks and generating the output from the last iteration.
//
// The reason we run 2 inputs at a time, is steps 2 and 3 are *still* not enough to soak up all
// available capacity with just one input. Running 2 at a time seems to give the CPU a good enough
// workout.
//
template<size_t STEP_SIZE>
error_code json_structural_indexer::index(const uint8_t *buf, size_t len, dom_parser_implementation &parser, stage1_mode partial) noexcept {
if (simdjson_unlikely(len > parser.capacity())) { return CAPACITY; }
// We guard the rest of the code so that we can assume that len > 0 throughout.
if (len == 0) { return EMPTY; }
if (is_streaming(partial)) {
len = trim_partial_utf8(buf, len);
// If you end up with an empty window after trimming
// the partial UTF-8 bytes, then chances are good that you
// have an UTF-8 formatting error.
if(len == 0) { return UTF8_ERROR; }
}
buf_block_reader<STEP_SIZE> reader(buf, len);
json_structural_indexer indexer(parser.structural_indexes.get());
// Read all but the last block
while (reader.has_full_block()) {
indexer.step<STEP_SIZE>(reader.full_block(), reader);
}
// Take care of the last block (will always be there unless file is empty which is
// not supposed to happen.)
uint8_t block[STEP_SIZE];
if (simdjson_unlikely(reader.get_remainder(block) == 0)) { return UNEXPECTED_ERROR; }
indexer.step<STEP_SIZE>(block, reader);
return indexer.finish(parser, reader.block_index(), len, partial);
}
template<>
simdjson_inline void json_structural_indexer::step<128>(const uint8_t *block, buf_block_reader<128> &reader) noexcept {
simd::simd8x64<uint8_t> in_1(block);
simd::simd8x64<uint8_t> in_2(block+64);
json_block block_1 = scanner.next(in_1);
json_block block_2 = scanner.next(in_2);
this->next(in_1, block_1, reader.block_index());
this->next(in_2, block_2, reader.block_index()+64);
reader.advance();
}
template<>
simdjson_inline void json_structural_indexer::step<64>(const uint8_t *block, buf_block_reader<64> &reader) noexcept {
simd::simd8x64<uint8_t> in_1(block);
json_block block_1 = scanner.next(in_1);
this->next(in_1, block_1, reader.block_index());
reader.advance();
}
simdjson_inline void json_structural_indexer::next(const simd::simd8x64<uint8_t>& in, const json_block& block, size_t idx) {
uint64_t unescaped = in.lteq(0x1F);
#if SIMDJSON_UTF8VALIDATION
checker.check_next_input(in);
#endif
indexer.write(uint32_t(idx-64), prev_structurals); // Output *last* iteration's structurals to the parser
prev_structurals = block.structural_start();
unescaped_chars_error |= block.non_quote_inside_string(unescaped);
}
simdjson_inline error_code json_structural_indexer::finish(dom_parser_implementation &parser, size_t idx, size_t len, stage1_mode partial) {
// Write out the final iteration's structurals
indexer.write(uint32_t(idx-64), prev_structurals);
error_code error = scanner.finish();
// We deliberately break down the next expression so that it is
// human readable.
const bool should_we_exit = is_streaming(partial) ?
((error != SUCCESS) && (error != UNCLOSED_STRING)) // when partial we tolerate UNCLOSED_STRING
: (error != SUCCESS); // if partial is false, we must have SUCCESS
const bool have_unclosed_string = (error == UNCLOSED_STRING);
if (simdjson_unlikely(should_we_exit)) { return error; }
if (unescaped_chars_error) {
return UNESCAPED_CHARS;
}
parser.n_structural_indexes = uint32_t(indexer.tail - parser.structural_indexes.get());
/***
* The On Demand API requires special padding.
*
* This is related to https://github.com/simdjson/simdjson/issues/906
* Basically, we want to make sure that if the parsing continues beyond the last (valid)
* structural character, it quickly stops.
* Only three structural characters can be repeated without triggering an error in JSON: [,] and }.
* We repeat the padding character (at 'len'). We don't know what it is, but if the parsing
* continues, then it must be [,] or }.
* Suppose it is ] or }. We backtrack to the first character, what could it be that would
* not trigger an error? It could be ] or } but no, because you can't start a document that way.
* It can't be a comma, a colon or any simple value. So the only way we could continue is
* if the repeated character is [. But if so, the document must start with [. But if the document
* starts with [, it should end with ]. If we enforce that rule, then we would get
* ][[ which is invalid.
*
* This is illustrated with the test array_iterate_unclosed_error() on the following input:
* R"({ "a": [,,)"
**/
parser.structural_indexes[parser.n_structural_indexes] = uint32_t(len); // used later in partial == stage1_mode::streaming_final
parser.structural_indexes[parser.n_structural_indexes + 1] = uint32_t(len);
parser.structural_indexes[parser.n_structural_indexes + 2] = 0;
parser.next_structural_index = 0;
// a valid JSON file cannot have zero structural indexes - we should have found something
if (simdjson_unlikely(parser.n_structural_indexes == 0u)) {
return EMPTY;
}
if (simdjson_unlikely(parser.structural_indexes[parser.n_structural_indexes - 1] > len)) {
return UNEXPECTED_ERROR;
}
if (partial == stage1_mode::streaming_partial) {
// If we have an unclosed string, then the last structural
// will be the quote and we want to make sure to omit it.
if(have_unclosed_string) {
parser.n_structural_indexes--;
// a valid JSON file cannot have zero structural indexes - we should have found something
if (simdjson_unlikely(parser.n_structural_indexes == 0u)) { return CAPACITY; }
}
// We truncate the input to the end of the last complete document (or zero).
auto new_structural_indexes = find_next_document_index(parser);
if (new_structural_indexes == 0 && parser.n_structural_indexes > 0) {
if(parser.structural_indexes[0] == 0) {
// If the buffer is partial and we started at index 0 but the document is
// incomplete, it's too big to parse.
return CAPACITY;
} else {
// It is possible that the document could be parsed, we just had a lot
// of white space.
parser.n_structural_indexes = 0;
return EMPTY;
}
}
parser.n_structural_indexes = new_structural_indexes;
} else if (partial == stage1_mode::streaming_final) {
if(have_unclosed_string) { parser.n_structural_indexes--; }
// We truncate the input to the end of the last complete document (or zero).
// Because partial == stage1_mode::streaming_final, it means that we may
// silently ignore trailing garbage. Though it sounds bad, we do it
// deliberately because many people who have streams of JSON documents
// will truncate them for processing. E.g., imagine that you are uncompressing
// the data from a size file or receiving it in chunks from the network. You
// may not know where exactly the last document will be. Meanwhile the
// document_stream instances allow people to know the JSON documents they are
// parsing (see the iterator.source() method).
parser.n_structural_indexes = find_next_document_index(parser);
// We store the initial n_structural_indexes so that the client can see
// whether we used truncation. If initial_n_structural_indexes == parser.n_structural_indexes,
// then this will query parser.structural_indexes[parser.n_structural_indexes] which is len,
// otherwise, it will copy some prior index.
parser.structural_indexes[parser.n_structural_indexes + 1] = parser.structural_indexes[parser.n_structural_indexes];
// This next line is critical, do not change it unless you understand what you are
// doing.
parser.structural_indexes[parser.n_structural_indexes] = uint32_t(len);
if (simdjson_unlikely(parser.n_structural_indexes == 0u)) {
// We tolerate an unclosed string at the very end of the stream. Indeed, users
// often load their data in bulk without being careful and they want us to ignore
// the trailing garbage.
return EMPTY;
}
}
checker.check_eof();
return checker.errors();
}
} // namespace stage1
} // unnamed namespace
} // namespace icelake
} // namespace simdjson
// Clear CUSTOM_BIT_INDEXER so other implementations can set it if they need to.
#undef SIMDJSON_GENERIC_JSON_STRUCTURAL_INDEXER_CUSTOM_BIT_INDEXER
#endif // SIMDJSON_SRC_GENERIC_STAGE1_JSON_STRUCTURAL_INDEXER_H
/* end file generic/stage1/json_structural_indexer.h for icelake */
/* including generic/stage1/utf8_validator.h for icelake: #include <generic/stage1/utf8_validator.h> */
/* begin file generic/stage1/utf8_validator.h for icelake */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_UTF8_VALIDATOR_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_UTF8_VALIDATOR_H */
/* amalgamation skipped (editor-only): #include <generic/stage1/base.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/buf_block_reader.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/utf8_lookup4_algorithm.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace icelake {
namespace {
namespace stage1 {
/**
* Validates that the string is actual UTF-8.
*/
template<class checker>
bool generic_validate_utf8(const uint8_t * input, size_t length) {
checker c{};
buf_block_reader<64> reader(input, length);
while (reader.has_full_block()) {
simd::simd8x64<uint8_t> in(reader.full_block());
c.check_next_input(in);
reader.advance();
}
uint8_t block[64]{};
reader.get_remainder(block);
simd::simd8x64<uint8_t> in(block);
c.check_next_input(in);
reader.advance();
c.check_eof();
return c.errors() == error_code::SUCCESS;
}
bool generic_validate_utf8(const char * input, size_t length) {
return generic_validate_utf8<utf8_checker>(reinterpret_cast<const uint8_t *>(input),length);
}
} // namespace stage1
} // unnamed namespace
} // namespace icelake
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE1_UTF8_VALIDATOR_H
/* end file generic/stage1/utf8_validator.h for icelake */
/* end file generic/stage1/amalgamated.h for icelake */
/* including generic/stage2/amalgamated.h for icelake: #include <generic/stage2/amalgamated.h> */
/* begin file generic/stage2/amalgamated.h for icelake */
// Stuff other things depend on
/* including generic/stage2/base.h for icelake: #include <generic/stage2/base.h> */
/* begin file generic/stage2/base.h for icelake */
#ifndef SIMDJSON_SRC_GENERIC_STAGE2_BASE_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE2_BASE_H */
/* amalgamation skipped (editor-only): #include <generic/base.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace icelake {
namespace {
namespace stage2 {
class json_iterator;
class structural_iterator;
struct tape_builder;
struct tape_writer;
} // namespace stage2
} // unnamed namespace
} // namespace icelake
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE2_BASE_H
/* end file generic/stage2/base.h for icelake */
/* including generic/stage2/tape_writer.h for icelake: #include <generic/stage2/tape_writer.h> */
/* begin file generic/stage2/tape_writer.h for icelake */
#ifndef SIMDJSON_SRC_GENERIC_STAGE2_TAPE_WRITER_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE2_TAPE_WRITER_H */
/* amalgamation skipped (editor-only): #include <generic/stage2/base.h> */
/* amalgamation skipped (editor-only): #include <simdjson/internal/tape_type.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#include <cstring>
namespace simdjson {
namespace icelake {
namespace {
namespace stage2 {
struct tape_writer {
/** The next place to write to tape */
uint64_t *next_tape_loc;
/** Write a signed 64-bit value to tape. */
simdjson_inline void append_s64(int64_t value) noexcept;
/** Write an unsigned 64-bit value to tape. */
simdjson_inline void append_u64(uint64_t value) noexcept;
/** Write a double value to tape. */
simdjson_inline void append_double(double value) noexcept;
/**
* Append a tape entry (an 8-bit type,and 56 bits worth of value).
*/
simdjson_inline void append(uint64_t val, internal::tape_type t) noexcept;
/**
* Skip the current tape entry without writing.
*
* Used to skip the start of the container, since we'll come back later to fill it in when the
* container ends.
*/
simdjson_inline void skip() noexcept;
/**
* Skip the number of tape entries necessary to write a large u64 or i64.
*/
simdjson_inline void skip_large_integer() noexcept;
/**
* Skip the number of tape entries necessary to write a double.
*/
simdjson_inline void skip_double() noexcept;
/**
* Write a value to a known location on tape.
*
* Used to go back and write out the start of a container after the container ends.
*/
simdjson_inline static void write(uint64_t &tape_loc, uint64_t val, internal::tape_type t) noexcept;
private:
/**
* Append both the tape entry, and a supplementary value following it. Used for types that need
* all 64 bits, such as double and uint64_t.
*/
template<typename T>
simdjson_inline void append2(uint64_t val, T val2, internal::tape_type t) noexcept;
}; // struct tape_writer
simdjson_inline void tape_writer::append_s64(int64_t value) noexcept {
append2(0, value, internal::tape_type::INT64);
}
simdjson_inline void tape_writer::append_u64(uint64_t value) noexcept {
append(0, internal::tape_type::UINT64);
*next_tape_loc = value;
next_tape_loc++;
}
/** Write a double value to tape. */
simdjson_inline void tape_writer::append_double(double value) noexcept {
append2(0, value, internal::tape_type::DOUBLE);
}
simdjson_inline void tape_writer::skip() noexcept {
next_tape_loc++;
}
simdjson_inline void tape_writer::skip_large_integer() noexcept {
next_tape_loc += 2;
}
simdjson_inline void tape_writer::skip_double() noexcept {
next_tape_loc += 2;
}
simdjson_inline void tape_writer::append(uint64_t val, internal::tape_type t) noexcept {
*next_tape_loc = val | ((uint64_t(char(t))) << 56);
next_tape_loc++;
}
template<typename T>
simdjson_inline void tape_writer::append2(uint64_t val, T val2, internal::tape_type t) noexcept {
append(val, t);
static_assert(sizeof(val2) == sizeof(*next_tape_loc), "Type is not 64 bits!");
memcpy(next_tape_loc, &val2, sizeof(val2));
next_tape_loc++;
}
simdjson_inline void tape_writer::write(uint64_t &tape_loc, uint64_t val, internal::tape_type t) noexcept {
tape_loc = val | ((uint64_t(char(t))) << 56);
}
} // namespace stage2
} // unnamed namespace
} // namespace icelake
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE2_TAPE_WRITER_H
/* end file generic/stage2/tape_writer.h for icelake */
/* including generic/stage2/logger.h for icelake: #include <generic/stage2/logger.h> */
/* begin file generic/stage2/logger.h for icelake */
#ifndef SIMDJSON_SRC_GENERIC_STAGE2_LOGGER_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE2_LOGGER_H */
/* amalgamation skipped (editor-only): #include <generic/stage2/base.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#include <cstring>
// This is for an internal-only stage 2 specific logger.
// Set LOG_ENABLED = true to log what stage 2 is doing!
namespace simdjson {
namespace icelake {
namespace {
namespace logger {
static constexpr const char * DASHES = "----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------";
#if SIMDJSON_VERBOSE_LOGGING
static constexpr const bool LOG_ENABLED = true;
#else
static constexpr const bool LOG_ENABLED = false;
#endif
static constexpr const int LOG_EVENT_LEN = 20;
static constexpr const int LOG_BUFFER_LEN = 30;
static constexpr const int LOG_SMALL_BUFFER_LEN = 10;
static constexpr const int LOG_INDEX_LEN = 5;
static int log_depth; // Not threadsafe. Log only.
// Helper to turn unprintable or newline characters into spaces
static simdjson_inline char printable_char(char c) {
if (c >= 0x20) {
return c;
} else {
return ' ';
}
}
// Print the header and set up log_start
static simdjson_inline void log_start() {
if (LOG_ENABLED) {
log_depth = 0;
printf("\n");
printf("| %-*s | %-*s | %-*s | %-*s | Detail |\n", LOG_EVENT_LEN, "Event", LOG_BUFFER_LEN, "Buffer", LOG_SMALL_BUFFER_LEN, "Next", 5, "Next#");
printf("|%.*s|%.*s|%.*s|%.*s|--------|\n", LOG_EVENT_LEN+2, DASHES, LOG_BUFFER_LEN+2, DASHES, LOG_SMALL_BUFFER_LEN+2, DASHES, 5+2, DASHES);
}
}
simdjson_unused static simdjson_inline void log_string(const char *message) {
if (LOG_ENABLED) {
printf("%s\n", message);
}
}
// Logs a single line from the stage 2 DOM parser
template<typename S>
static simdjson_inline void log_line(S &structurals, const char *title_prefix, const char *title, const char *detail) {
if (LOG_ENABLED) {
printf("| %*s%s%-*s ", log_depth*2, "", title_prefix, LOG_EVENT_LEN - log_depth*2 - int(strlen(title_prefix)), title);
auto current_index = structurals.at_beginning() ? nullptr : structurals.next_structural-1;
auto next_index = structurals.next_structural;
auto current = current_index ? &structurals.buf[*current_index] : reinterpret_cast<const uint8_t*>(" ");
auto next = &structurals.buf[*next_index];
{
// Print the next N characters in the buffer.
printf("| ");
// Otherwise, print the characters starting from the buffer position.
// Print spaces for unprintable or newline characters.
for (int i=0;i<LOG_BUFFER_LEN;i++) {
printf("%c", printable_char(current[i]));
}
printf(" ");
// Print the next N characters in the buffer.
printf("| ");
// Otherwise, print the characters starting from the buffer position.
// Print spaces for unprintable or newline characters.
for (int i=0;i<LOG_SMALL_BUFFER_LEN;i++) {
printf("%c", printable_char(next[i]));
}
printf(" ");
}
if (current_index) {
printf("| %*u ", LOG_INDEX_LEN, *current_index);
} else {
printf("| %-*s ", LOG_INDEX_LEN, "");
}
// printf("| %*u ", LOG_INDEX_LEN, structurals.next_tape_index());
printf("| %-s ", detail);
printf("|\n");
}
}
} // namespace logger
} // unnamed namespace
} // namespace icelake
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE2_LOGGER_H
/* end file generic/stage2/logger.h for icelake */
// All other declarations
/* including generic/stage2/json_iterator.h for icelake: #include <generic/stage2/json_iterator.h> */
/* begin file generic/stage2/json_iterator.h for icelake */
#ifndef SIMDJSON_SRC_GENERIC_STAGE2_JSON_ITERATOR_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE2_JSON_ITERATOR_H */
/* amalgamation skipped (editor-only): #include <generic/stage2/base.h> */
/* amalgamation skipped (editor-only): #include <generic/stage2/logger.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/dom_parser_implementation.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace icelake {
namespace {
namespace stage2 {
class json_iterator {
public:
const uint8_t* const buf;
uint32_t *next_structural;
dom_parser_implementation &dom_parser;
uint32_t depth{0};
/**
* Walk the JSON document.
*
* The visitor receives callbacks when values are encountered. All callbacks pass the iterator as
* the first parameter; some callbacks have other parameters as well:
*
* - visit_document_start() - at the beginning.
* - visit_document_end() - at the end (if things were successful).
*
* - visit_array_start() - at the start `[` of a non-empty array.
* - visit_array_end() - at the end `]` of a non-empty array.
* - visit_empty_array() - when an empty array is encountered.
*
* - visit_object_end() - at the start `]` of a non-empty object.
* - visit_object_start() - at the end `]` of a non-empty object.
* - visit_empty_object() - when an empty object is encountered.
* - visit_key(const uint8_t *key) - when a key in an object field is encountered. key is
* guaranteed to point at the first quote of the string (`"key"`).
* - visit_primitive(const uint8_t *value) - when a value is a string, number, boolean or null.
* - visit_root_primitive(iter, uint8_t *value) - when the top-level value is a string, number, boolean or null.
*
* - increment_count(iter) - each time a value is found in an array or object.
*/
template<bool STREAMING, typename V>
simdjson_warn_unused simdjson_inline error_code walk_document(V &visitor) noexcept;
/**
* Create an iterator capable of walking a JSON document.
*
* The document must have already passed through stage 1.
*/
simdjson_inline json_iterator(dom_parser_implementation &_dom_parser, size_t start_structural_index);
/**
* Look at the next token.
*
* Tokens can be strings, numbers, booleans, null, or operators (`[{]},:`)).
*
* They may include invalid JSON as well (such as `1.2.3` or `ture`).
*/
simdjson_inline const uint8_t *peek() const noexcept;
/**
* Advance to the next token.
*
* Tokens can be strings, numbers, booleans, null, or operators (`[{]},:`)).
*
* They may include invalid JSON as well (such as `1.2.3` or `ture`).
*/
simdjson_inline const uint8_t *advance() noexcept;
/**
* Get the remaining length of the document, from the start of the current token.
*/
simdjson_inline size_t remaining_len() const noexcept;
/**
* Check if we are at the end of the document.
*
* If this is true, there are no more tokens.
*/
simdjson_inline bool at_eof() const noexcept;
/**
* Check if we are at the beginning of the document.
*/
simdjson_inline bool at_beginning() const noexcept;
simdjson_inline uint8_t last_structural() const noexcept;
/**
* Log that a value has been found.
*
* Set LOG_ENABLED=true in logger.h to see logging.
*/
simdjson_inline void log_value(const char *type) const noexcept;
/**
* Log the start of a multipart value.
*
* Set LOG_ENABLED=true in logger.h to see logging.
*/
simdjson_inline void log_start_value(const char *type) const noexcept;
/**
* Log the end of a multipart value.
*
* Set LOG_ENABLED=true in logger.h to see logging.
*/
simdjson_inline void log_end_value(const char *type) const noexcept;
/**
* Log an error.
*
* Set LOG_ENABLED=true in logger.h to see logging.
*/
simdjson_inline void log_error(const char *error) const noexcept;
template<typename V>
simdjson_warn_unused simdjson_inline error_code visit_root_primitive(V &visitor, const uint8_t *value) noexcept;
template<typename V>
simdjson_warn_unused simdjson_inline error_code visit_primitive(V &visitor, const uint8_t *value) noexcept;
};
template<bool STREAMING, typename V>
simdjson_warn_unused simdjson_inline error_code json_iterator::walk_document(V &visitor) noexcept {
logger::log_start();
//
// Start the document
//
if (at_eof()) { return EMPTY; }
log_start_value("document");
SIMDJSON_TRY( visitor.visit_document_start(*this) );
//
// Read first value
//
{
auto value = advance();
// Make sure the outer object or array is closed before continuing; otherwise, there are ways we
// could get into memory corruption. See https://github.com/simdjson/simdjson/issues/906
if (!STREAMING) {
switch (*value) {
case '{': if (last_structural() != '}') { log_value("starting brace unmatched"); return TAPE_ERROR; }; break;
case '[': if (last_structural() != ']') { log_value("starting bracket unmatched"); return TAPE_ERROR; }; break;
}
}
switch (*value) {
case '{': if (*peek() == '}') { advance(); log_value("empty object"); SIMDJSON_TRY( visitor.visit_empty_object(*this) ); break; } goto object_begin;
case '[': if (*peek() == ']') { advance(); log_value("empty array"); SIMDJSON_TRY( visitor.visit_empty_array(*this) ); break; } goto array_begin;
default: SIMDJSON_TRY( visitor.visit_root_primitive(*this, value) ); break;
}
}
goto document_end;
//
// Object parser states
//
object_begin:
log_start_value("object");
depth++;
if (depth >= dom_parser.max_depth()) { log_error("Exceeded max depth!"); return DEPTH_ERROR; }
dom_parser.is_array[depth] = false;
SIMDJSON_TRY( visitor.visit_object_start(*this) );
{
auto key = advance();
if (*key != '"') { log_error("Object does not start with a key"); return TAPE_ERROR; }
SIMDJSON_TRY( visitor.increment_count(*this) );
SIMDJSON_TRY( visitor.visit_key(*this, key) );
}
object_field:
if (simdjson_unlikely( *advance() != ':' )) { log_error("Missing colon after key in object"); return TAPE_ERROR; }
{
auto value = advance();
switch (*value) {
case '{': if (*peek() == '}') { advance(); log_value("empty object"); SIMDJSON_TRY( visitor.visit_empty_object(*this) ); break; } goto object_begin;
case '[': if (*peek() == ']') { advance(); log_value("empty array"); SIMDJSON_TRY( visitor.visit_empty_array(*this) ); break; } goto array_begin;
default: SIMDJSON_TRY( visitor.visit_primitive(*this, value) ); break;
}
}
object_continue:
switch (*advance()) {
case ',':
SIMDJSON_TRY( visitor.increment_count(*this) );
{
auto key = advance();
if (simdjson_unlikely( *key != '"' )) { log_error("Key string missing at beginning of field in object"); return TAPE_ERROR; }
SIMDJSON_TRY( visitor.visit_key(*this, key) );
}
goto object_field;
case '}': log_end_value("object"); SIMDJSON_TRY( visitor.visit_object_end(*this) ); goto scope_end;
default: log_error("No comma between object fields"); return TAPE_ERROR;
}
scope_end:
depth--;
if (depth == 0) { goto document_end; }
if (dom_parser.is_array[depth]) { goto array_continue; }
goto object_continue;
//
// Array parser states
//
array_begin:
log_start_value("array");
depth++;
if (depth >= dom_parser.max_depth()) { log_error("Exceeded max depth!"); return DEPTH_ERROR; }
dom_parser.is_array[depth] = true;
SIMDJSON_TRY( visitor.visit_array_start(*this) );
SIMDJSON_TRY( visitor.increment_count(*this) );
array_value:
{
auto value = advance();
switch (*value) {
case '{': if (*peek() == '}') { advance(); log_value("empty object"); SIMDJSON_TRY( visitor.visit_empty_object(*this) ); break; } goto object_begin;
case '[': if (*peek() == ']') { advance(); log_value("empty array"); SIMDJSON_TRY( visitor.visit_empty_array(*this) ); break; } goto array_begin;
default: SIMDJSON_TRY( visitor.visit_primitive(*this, value) ); break;
}
}
array_continue:
switch (*advance()) {
case ',': SIMDJSON_TRY( visitor.increment_count(*this) ); goto array_value;
case ']': log_end_value("array"); SIMDJSON_TRY( visitor.visit_array_end(*this) ); goto scope_end;
default: log_error("Missing comma between array values"); return TAPE_ERROR;
}
document_end:
log_end_value("document");
SIMDJSON_TRY( visitor.visit_document_end(*this) );
dom_parser.next_structural_index = uint32_t(next_structural - &dom_parser.structural_indexes[0]);
// If we didn't make it to the end, it's an error
if ( !STREAMING && dom_parser.next_structural_index != dom_parser.n_structural_indexes ) {
log_error("More than one JSON value at the root of the document, or extra characters at the end of the JSON!");
return TAPE_ERROR;
}
return SUCCESS;
} // walk_document()
simdjson_inline json_iterator::json_iterator(dom_parser_implementation &_dom_parser, size_t start_structural_index)
: buf{_dom_parser.buf},
next_structural{&_dom_parser.structural_indexes[start_structural_index]},
dom_parser{_dom_parser} {
}
simdjson_inline const uint8_t *json_iterator::peek() const noexcept {
return &buf[*(next_structural)];
}
simdjson_inline const uint8_t *json_iterator::advance() noexcept {
return &buf[*(next_structural++)];
}
simdjson_inline size_t json_iterator::remaining_len() const noexcept {
return dom_parser.len - *(next_structural-1);
}
simdjson_inline bool json_iterator::at_eof() const noexcept {
return next_structural == &dom_parser.structural_indexes[dom_parser.n_structural_indexes];
}
simdjson_inline bool json_iterator::at_beginning() const noexcept {
return next_structural == dom_parser.structural_indexes.get();
}
simdjson_inline uint8_t json_iterator::last_structural() const noexcept {
return buf[dom_parser.structural_indexes[dom_parser.n_structural_indexes - 1]];
}
simdjson_inline void json_iterator::log_value(const char *type) const noexcept {
logger::log_line(*this, "", type, "");
}
simdjson_inline void json_iterator::log_start_value(const char *type) const noexcept {
logger::log_line(*this, "+", type, "");
if (logger::LOG_ENABLED) { logger::log_depth++; }
}
simdjson_inline void json_iterator::log_end_value(const char *type) const noexcept {
if (logger::LOG_ENABLED) { logger::log_depth--; }
logger::log_line(*this, "-", type, "");
}
simdjson_inline void json_iterator::log_error(const char *error) const noexcept {
logger::log_line(*this, "", "ERROR", error);
}
template<typename V>
simdjson_warn_unused simdjson_inline error_code json_iterator::visit_root_primitive(V &visitor, const uint8_t *value) noexcept {
switch (*value) {
case '"': return visitor.visit_root_string(*this, value);
case 't': return visitor.visit_root_true_atom(*this, value);
case 'f': return visitor.visit_root_false_atom(*this, value);
case 'n': return visitor.visit_root_null_atom(*this, value);
case '-':
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
return visitor.visit_root_number(*this, value);
default:
log_error("Document starts with a non-value character");
return TAPE_ERROR;
}
}
template<typename V>
simdjson_warn_unused simdjson_inline error_code json_iterator::visit_primitive(V &visitor, const uint8_t *value) noexcept {
// Use the fact that most scalars are going to be either strings or numbers.
if(*value == '"') {
return visitor.visit_string(*this, value);
} else if (((*value - '0') < 10) || (*value == '-')) {
return visitor.visit_number(*this, value);
}
// true, false, null are uncommon.
switch (*value) {
case 't': return visitor.visit_true_atom(*this, value);
case 'f': return visitor.visit_false_atom(*this, value);
case 'n': return visitor.visit_null_atom(*this, value);
default:
log_error("Non-value found when value was expected!");
return TAPE_ERROR;
}
}
} // namespace stage2
} // unnamed namespace
} // namespace icelake
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE2_JSON_ITERATOR_H
/* end file generic/stage2/json_iterator.h for icelake */
/* including generic/stage2/stringparsing.h for icelake: #include <generic/stage2/stringparsing.h> */
/* begin file generic/stage2/stringparsing.h for icelake */
#ifndef SIMDJSON_SRC_GENERIC_STAGE2_STRINGPARSING_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE2_STRINGPARSING_H */
/* amalgamation skipped (editor-only): #include <generic/stage2/base.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/jsoncharutils.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
// This file contains the common code every implementation uses
// It is intended to be included multiple times and compiled multiple times
namespace simdjson {
namespace icelake {
namespace {
/// @private
namespace stringparsing {
// begin copypasta
// These chars yield themselves: " \ /
// b -> backspace, f -> formfeed, n -> newline, r -> cr, t -> horizontal tab
// u not handled in this table as it's complex
static const uint8_t escape_map[256] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x0.
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0x22, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x2f,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x4.
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x5c, 0, 0, 0, // 0x5.
0, 0, 0x08, 0, 0, 0, 0x0c, 0, 0, 0, 0, 0, 0, 0, 0x0a, 0, // 0x6.
0, 0, 0x0d, 0, 0x09, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x7.
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
};
// handle a unicode codepoint
// write appropriate values into dest
// src will advance 6 bytes or 12 bytes
// dest will advance a variable amount (return via pointer)
// return true if the unicode codepoint was valid
// We work in little-endian then swap at write time
simdjson_warn_unused
simdjson_inline bool handle_unicode_codepoint(const uint8_t **src_ptr,
uint8_t **dst_ptr, bool allow_replacement) {
// Use the default Unicode Character 'REPLACEMENT CHARACTER' (U+FFFD)
constexpr uint32_t substitution_code_point = 0xfffd;
// jsoncharutils::hex_to_u32_nocheck fills high 16 bits of the return value with 1s if the
// conversion is not valid; we defer the check for this to inside the
// multilingual plane check.
uint32_t code_point = jsoncharutils::hex_to_u32_nocheck(*src_ptr + 2);
*src_ptr += 6;
// If we found a high surrogate, we must
// check for low surrogate for characters
// outside the Basic
// Multilingual Plane.
if (code_point >= 0xd800 && code_point < 0xdc00) {
const uint8_t *src_data = *src_ptr;
/* Compiler optimizations convert this to a single 16-bit load and compare on most platforms */
if (((src_data[0] << 8) | src_data[1]) != ((static_cast<uint8_t> ('\\') << 8) | static_cast<uint8_t> ('u'))) {
if(!allow_replacement) { return false; }
code_point = substitution_code_point;
} else {
uint32_t code_point_2 = jsoncharutils::hex_to_u32_nocheck(src_data + 2);
// We have already checked that the high surrogate is valid and
// (code_point - 0xd800) < 1024.
//
// Check that code_point_2 is in the range 0xdc00..0xdfff
// and that code_point_2 was parsed from valid hex.
uint32_t low_bit = code_point_2 - 0xdc00;
if (low_bit >> 10) {
if(!allow_replacement) { return false; }
code_point = substitution_code_point;
} else {
code_point = (((code_point - 0xd800) << 10) | low_bit) + 0x10000;
*src_ptr += 6;
}
}
} else if (code_point >= 0xdc00 && code_point <= 0xdfff) {
// If we encounter a low surrogate (not preceded by a high surrogate)
// then we have an error.
if(!allow_replacement) { return false; }
code_point = substitution_code_point;
}
size_t offset = jsoncharutils::codepoint_to_utf8(code_point, *dst_ptr);
*dst_ptr += offset;
return offset > 0;
}
// handle a unicode codepoint using the wobbly convention
// https://simonsapin.github.io/wtf-8/
// write appropriate values into dest
// src will advance 6 bytes or 12 bytes
// dest will advance a variable amount (return via pointer)
// return true if the unicode codepoint was valid
// We work in little-endian then swap at write time
simdjson_warn_unused
simdjson_inline bool handle_unicode_codepoint_wobbly(const uint8_t **src_ptr,
uint8_t **dst_ptr) {
// It is not ideal that this function is nearly identical to handle_unicode_codepoint.
//
// jsoncharutils::hex_to_u32_nocheck fills high 16 bits of the return value with 1s if the
// conversion is not valid; we defer the check for this to inside the
// multilingual plane check.
uint32_t code_point = jsoncharutils::hex_to_u32_nocheck(*src_ptr + 2);
*src_ptr += 6;
// If we found a high surrogate, we must
// check for low surrogate for characters
// outside the Basic
// Multilingual Plane.
if (code_point >= 0xd800 && code_point < 0xdc00) {
const uint8_t *src_data = *src_ptr;
/* Compiler optimizations convert this to a single 16-bit load and compare on most platforms */
if (((src_data[0] << 8) | src_data[1]) == ((static_cast<uint8_t> ('\\') << 8) | static_cast<uint8_t> ('u'))) {
uint32_t code_point_2 = jsoncharutils::hex_to_u32_nocheck(src_data + 2);
uint32_t low_bit = code_point_2 - 0xdc00;
if ((low_bit >> 10) == 0) {
code_point =
(((code_point - 0xd800) << 10) | low_bit) + 0x10000;
*src_ptr += 6;
}
}
}
size_t offset = jsoncharutils::codepoint_to_utf8(code_point, *dst_ptr);
*dst_ptr += offset;
return offset > 0;
}
/**
* Unescape a valid UTF-8 string from src to dst, stopping at a final unescaped quote. There
* must be an unescaped quote terminating the string. It returns the final output
* position as pointer. In case of error (e.g., the string has bad escaped codes),
* then null_nullptrptr is returned. It is assumed that the output buffer is large
* enough. E.g., if src points at 'joe"', then dst needs to have four free bytes +
* SIMDJSON_PADDING bytes.
*/
simdjson_warn_unused simdjson_inline uint8_t *parse_string(const uint8_t *src, uint8_t *dst, bool allow_replacement) {
while (1) {
// Copy the next n bytes, and find the backslash and quote in them.
auto bs_quote = backslash_and_quote::copy_and_find(src, dst);
// If the next thing is the end quote, copy and return
if (bs_quote.has_quote_first()) {
// we encountered quotes first. Move dst to point to quotes and exit
return dst + bs_quote.quote_index();
}
if (bs_quote.has_backslash()) {
/* find out where the backspace is */
auto bs_dist = bs_quote.backslash_index();
uint8_t escape_char = src[bs_dist + 1];
/* we encountered backslash first. Handle backslash */
if (escape_char == 'u') {
/* move src/dst up to the start; they will be further adjusted
within the unicode codepoint handling code. */
src += bs_dist;
dst += bs_dist;
if (!handle_unicode_codepoint(&src, &dst, allow_replacement)) {
return nullptr;
}
} else {
/* simple 1:1 conversion. Will eat bs_dist+2 characters in input and
* write bs_dist+1 characters to output
* note this may reach beyond the part of the buffer we've actually
* seen. I think this is ok */
uint8_t escape_result = escape_map[escape_char];
if (escape_result == 0u) {
return nullptr; /* bogus escape value is an error */
}
dst[bs_dist] = escape_result;
src += bs_dist + 2;
dst += bs_dist + 1;
}
} else {
/* they are the same. Since they can't co-occur, it means we
* encountered neither. */
src += backslash_and_quote::BYTES_PROCESSED;
dst += backslash_and_quote::BYTES_PROCESSED;
}
}
}
simdjson_warn_unused simdjson_inline uint8_t *parse_wobbly_string(const uint8_t *src, uint8_t *dst) {
// It is not ideal that this function is nearly identical to parse_string.
while (1) {
// Copy the next n bytes, and find the backslash and quote in them.
auto bs_quote = backslash_and_quote::copy_and_find(src, dst);
// If the next thing is the end quote, copy and return
if (bs_quote.has_quote_first()) {
// we encountered quotes first. Move dst to point to quotes and exit
return dst + bs_quote.quote_index();
}
if (bs_quote.has_backslash()) {
/* find out where the backspace is */
auto bs_dist = bs_quote.backslash_index();
uint8_t escape_char = src[bs_dist + 1];
/* we encountered backslash first. Handle backslash */
if (escape_char == 'u') {
/* move src/dst up to the start; they will be further adjusted
within the unicode codepoint handling code. */
src += bs_dist;
dst += bs_dist;
if (!handle_unicode_codepoint_wobbly(&src, &dst)) {
return nullptr;
}
} else {
/* simple 1:1 conversion. Will eat bs_dist+2 characters in input and
* write bs_dist+1 characters to output
* note this may reach beyond the part of the buffer we've actually
* seen. I think this is ok */
uint8_t escape_result = escape_map[escape_char];
if (escape_result == 0u) {
return nullptr; /* bogus escape value is an error */
}
dst[bs_dist] = escape_result;
src += bs_dist + 2;
dst += bs_dist + 1;
}
} else {
/* they are the same. Since they can't co-occur, it means we
* encountered neither. */
src += backslash_and_quote::BYTES_PROCESSED;
dst += backslash_and_quote::BYTES_PROCESSED;
}
}
}
} // namespace stringparsing
} // unnamed namespace
} // namespace icelake
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE2_STRINGPARSING_H
/* end file generic/stage2/stringparsing.h for icelake */
/* including generic/stage2/structural_iterator.h for icelake: #include <generic/stage2/structural_iterator.h> */
/* begin file generic/stage2/structural_iterator.h for icelake */
#ifndef SIMDJSON_SRC_GENERIC_STAGE2_STRUCTURAL_ITERATOR_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE2_STRUCTURAL_ITERATOR_H */
/* amalgamation skipped (editor-only): #include <generic/stage2/base.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/dom_parser_implementation.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace icelake {
namespace {
namespace stage2 {
class structural_iterator {
public:
const uint8_t* const buf;
uint32_t *next_structural;
dom_parser_implementation &dom_parser;
// Start a structural
simdjson_inline structural_iterator(dom_parser_implementation &_dom_parser, size_t start_structural_index)
: buf{_dom_parser.buf},
next_structural{&_dom_parser.structural_indexes[start_structural_index]},
dom_parser{_dom_parser} {
}
// Get the buffer position of the current structural character
simdjson_inline const uint8_t* current() {
return &buf[*(next_structural-1)];
}
// Get the current structural character
simdjson_inline char current_char() {
return buf[*(next_structural-1)];
}
// Get the next structural character without advancing
simdjson_inline char peek_next_char() {
return buf[*next_structural];
}
simdjson_inline const uint8_t* peek() {
return &buf[*next_structural];
}
simdjson_inline const uint8_t* advance() {
return &buf[*(next_structural++)];
}
simdjson_inline char advance_char() {
return buf[*(next_structural++)];
}
simdjson_inline size_t remaining_len() {
return dom_parser.len - *(next_structural-1);
}
simdjson_inline bool at_end() {
return next_structural == &dom_parser.structural_indexes[dom_parser.n_structural_indexes];
}
simdjson_inline bool at_beginning() {
return next_structural == dom_parser.structural_indexes.get();
}
};
} // namespace stage2
} // unnamed namespace
} // namespace icelake
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE2_STRUCTURAL_ITERATOR_H
/* end file generic/stage2/structural_iterator.h for icelake */
/* including generic/stage2/tape_builder.h for icelake: #include <generic/stage2/tape_builder.h> */
/* begin file generic/stage2/tape_builder.h for icelake */
#ifndef SIMDJSON_SRC_GENERIC_STAGE2_TAPE_BUILDER_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE2_TAPE_BUILDER_H */
/* amalgamation skipped (editor-only): #include <generic/stage2/base.h> */
/* amalgamation skipped (editor-only): #include <generic/stage2/json_iterator.h> */
/* amalgamation skipped (editor-only): #include <generic/stage2/stringparsing.h> */
/* amalgamation skipped (editor-only): #include <generic/stage2/tape_writer.h> */
/* amalgamation skipped (editor-only): #include <simdjson/dom/document.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/atomparsing.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/dom_parser_implementation.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/numberparsing.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace icelake {
namespace {
namespace stage2 {
struct tape_builder {
template<bool STREAMING>
simdjson_warn_unused static simdjson_inline error_code parse_document(
dom_parser_implementation &dom_parser,
dom::document &doc) noexcept;
/** Called when a non-empty document starts. */
simdjson_warn_unused simdjson_inline error_code visit_document_start(json_iterator &iter) noexcept;
/** Called when a non-empty document ends without error. */
simdjson_warn_unused simdjson_inline error_code visit_document_end(json_iterator &iter) noexcept;
/** Called when a non-empty array starts. */
simdjson_warn_unused simdjson_inline error_code visit_array_start(json_iterator &iter) noexcept;
/** Called when a non-empty array ends. */
simdjson_warn_unused simdjson_inline error_code visit_array_end(json_iterator &iter) noexcept;
/** Called when an empty array is found. */
simdjson_warn_unused simdjson_inline error_code visit_empty_array(json_iterator &iter) noexcept;
/** Called when a non-empty object starts. */
simdjson_warn_unused simdjson_inline error_code visit_object_start(json_iterator &iter) noexcept;
/**
* Called when a key in a field is encountered.
*
* primitive, visit_object_start, visit_empty_object, visit_array_start, or visit_empty_array
* will be called after this with the field value.
*/
simdjson_warn_unused simdjson_inline error_code visit_key(json_iterator &iter, const uint8_t *key) noexcept;
/** Called when a non-empty object ends. */
simdjson_warn_unused simdjson_inline error_code visit_object_end(json_iterator &iter) noexcept;
/** Called when an empty object is found. */
simdjson_warn_unused simdjson_inline error_code visit_empty_object(json_iterator &iter) noexcept;
/**
* Called when a string, number, boolean or null is found.
*/
simdjson_warn_unused simdjson_inline error_code visit_primitive(json_iterator &iter, const uint8_t *value) noexcept;
/**
* Called when a string, number, boolean or null is found at the top level of a document (i.e.
* when there is no array or object and the entire document is a single string, number, boolean or
* null.
*
* This is separate from primitive() because simdjson's normal primitive parsing routines assume
* there is at least one more token after the value, which is only true in an array or object.
*/
simdjson_warn_unused simdjson_inline error_code visit_root_primitive(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_string(json_iterator &iter, const uint8_t *value, bool key = false) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_number(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_true_atom(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_false_atom(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_null_atom(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_root_string(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_root_number(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_root_true_atom(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_root_false_atom(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_root_null_atom(json_iterator &iter, const uint8_t *value) noexcept;
/** Called each time a new field or element in an array or object is found. */
simdjson_warn_unused simdjson_inline error_code increment_count(json_iterator &iter) noexcept;
/** Next location to write to tape */
tape_writer tape;
private:
/** Next write location in the string buf for stage 2 parsing */
uint8_t *current_string_buf_loc;
simdjson_inline tape_builder(dom::document &doc) noexcept;
simdjson_inline uint32_t next_tape_index(json_iterator &iter) const noexcept;
simdjson_inline void start_container(json_iterator &iter) noexcept;
simdjson_warn_unused simdjson_inline error_code end_container(json_iterator &iter, internal::tape_type start, internal::tape_type end) noexcept;
simdjson_warn_unused simdjson_inline error_code empty_container(json_iterator &iter, internal::tape_type start, internal::tape_type end) noexcept;
simdjson_inline uint8_t *on_start_string(json_iterator &iter) noexcept;
simdjson_inline void on_end_string(uint8_t *dst) noexcept;
}; // struct tape_builder
template<bool STREAMING>
simdjson_warn_unused simdjson_inline error_code tape_builder::parse_document(
dom_parser_implementation &dom_parser,
dom::document &doc) noexcept {
dom_parser.doc = &doc;
json_iterator iter(dom_parser, STREAMING ? dom_parser.next_structural_index : 0);
tape_builder builder(doc);
return iter.walk_document<STREAMING>(builder);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_root_primitive(json_iterator &iter, const uint8_t *value) noexcept {
return iter.visit_root_primitive(*this, value);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_primitive(json_iterator &iter, const uint8_t *value) noexcept {
return iter.visit_primitive(*this, value);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_empty_object(json_iterator &iter) noexcept {
return empty_container(iter, internal::tape_type::START_OBJECT, internal::tape_type::END_OBJECT);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_empty_array(json_iterator &iter) noexcept {
return empty_container(iter, internal::tape_type::START_ARRAY, internal::tape_type::END_ARRAY);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_document_start(json_iterator &iter) noexcept {
start_container(iter);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_object_start(json_iterator &iter) noexcept {
start_container(iter);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_array_start(json_iterator &iter) noexcept {
start_container(iter);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_object_end(json_iterator &iter) noexcept {
return end_container(iter, internal::tape_type::START_OBJECT, internal::tape_type::END_OBJECT);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_array_end(json_iterator &iter) noexcept {
return end_container(iter, internal::tape_type::START_ARRAY, internal::tape_type::END_ARRAY);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_document_end(json_iterator &iter) noexcept {
constexpr uint32_t start_tape_index = 0;
tape.append(start_tape_index, internal::tape_type::ROOT);
tape_writer::write(iter.dom_parser.doc->tape[start_tape_index], next_tape_index(iter), internal::tape_type::ROOT);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_key(json_iterator &iter, const uint8_t *key) noexcept {
return visit_string(iter, key, true);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::increment_count(json_iterator &iter) noexcept {
iter.dom_parser.open_containers[iter.depth].count++; // we have a key value pair in the object at parser.dom_parser.depth - 1
return SUCCESS;
}
simdjson_inline tape_builder::tape_builder(dom::document &doc) noexcept : tape{doc.tape.get()}, current_string_buf_loc{doc.string_buf.get()} {}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_string(json_iterator &iter, const uint8_t *value, bool key) noexcept {
iter.log_value(key ? "key" : "string");
uint8_t *dst = on_start_string(iter);
dst = stringparsing::parse_string(value+1, dst, false); // We do not allow replacement when the escape characters are invalid.
if (dst == nullptr) {
iter.log_error("Invalid escape in string");
return STRING_ERROR;
}
on_end_string(dst);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_root_string(json_iterator &iter, const uint8_t *value) noexcept {
return visit_string(iter, value);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_number(json_iterator &iter, const uint8_t *value) noexcept {
iter.log_value("number");
return numberparsing::parse_number(value, tape);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_root_number(json_iterator &iter, const uint8_t *value) noexcept {
//
// We need to make a copy to make sure that the string is space terminated.
// This is not about padding the input, which should already padded up
// to len + SIMDJSON_PADDING. However, we have no control at this stage
// on how the padding was done. What if the input string was padded with nulls?
// It is quite common for an input string to have an extra null character (C string).
// We do not want to allow 9\0 (where \0 is the null character) inside a JSON
// document, but the string "9\0" by itself is fine. So we make a copy and
// pad the input with spaces when we know that there is just one input element.
// This copy is relatively expensive, but it will almost never be called in
// practice unless you are in the strange scenario where you have many JSON
// documents made of single atoms.
//
std::unique_ptr<uint8_t[]>copy(new (std::nothrow) uint8_t[iter.remaining_len() + SIMDJSON_PADDING]);
if (copy.get() == nullptr) { return MEMALLOC; }
std::memcpy(copy.get(), value, iter.remaining_len());
std::memset(copy.get() + iter.remaining_len(), ' ', SIMDJSON_PADDING);
error_code error = visit_number(iter, copy.get());
return error;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_true_atom(json_iterator &iter, const uint8_t *value) noexcept {
iter.log_value("true");
if (!atomparsing::is_valid_true_atom(value)) { return T_ATOM_ERROR; }
tape.append(0, internal::tape_type::TRUE_VALUE);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_root_true_atom(json_iterator &iter, const uint8_t *value) noexcept {
iter.log_value("true");
if (!atomparsing::is_valid_true_atom(value, iter.remaining_len())) { return T_ATOM_ERROR; }
tape.append(0, internal::tape_type::TRUE_VALUE);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_false_atom(json_iterator &iter, const uint8_t *value) noexcept {
iter.log_value("false");
if (!atomparsing::is_valid_false_atom(value)) { return F_ATOM_ERROR; }
tape.append(0, internal::tape_type::FALSE_VALUE);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_root_false_atom(json_iterator &iter, const uint8_t *value) noexcept {
iter.log_value("false");
if (!atomparsing::is_valid_false_atom(value, iter.remaining_len())) { return F_ATOM_ERROR; }
tape.append(0, internal::tape_type::FALSE_VALUE);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_null_atom(json_iterator &iter, const uint8_t *value) noexcept {
iter.log_value("null");
if (!atomparsing::is_valid_null_atom(value)) { return N_ATOM_ERROR; }
tape.append(0, internal::tape_type::NULL_VALUE);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_root_null_atom(json_iterator &iter, const uint8_t *value) noexcept {
iter.log_value("null");
if (!atomparsing::is_valid_null_atom(value, iter.remaining_len())) { return N_ATOM_ERROR; }
tape.append(0, internal::tape_type::NULL_VALUE);
return SUCCESS;
}
// private:
simdjson_inline uint32_t tape_builder::next_tape_index(json_iterator &iter) const noexcept {
return uint32_t(tape.next_tape_loc - iter.dom_parser.doc->tape.get());
}
simdjson_warn_unused simdjson_inline error_code tape_builder::empty_container(json_iterator &iter, internal::tape_type start, internal::tape_type end) noexcept {
auto start_index = next_tape_index(iter);
tape.append(start_index+2, start);
tape.append(start_index, end);
return SUCCESS;
}
simdjson_inline void tape_builder::start_container(json_iterator &iter) noexcept {
iter.dom_parser.open_containers[iter.depth].tape_index = next_tape_index(iter);
iter.dom_parser.open_containers[iter.depth].count = 0;
tape.skip(); // We don't actually *write* the start element until the end.
}
simdjson_warn_unused simdjson_inline error_code tape_builder::end_container(json_iterator &iter, internal::tape_type start, internal::tape_type end) noexcept {
// Write the ending tape element, pointing at the start location
const uint32_t start_tape_index = iter.dom_parser.open_containers[iter.depth].tape_index;
tape.append(start_tape_index, end);
// Write the start tape element, pointing at the end location (and including count)
// count can overflow if it exceeds 24 bits... so we saturate
// the convention being that a cnt of 0xffffff or more is undetermined in value (>= 0xffffff).
const uint32_t count = iter.dom_parser.open_containers[iter.depth].count;
const uint32_t cntsat = count > 0xFFFFFF ? 0xFFFFFF : count;
tape_writer::write(iter.dom_parser.doc->tape[start_tape_index], next_tape_index(iter) | (uint64_t(cntsat) << 32), start);
return SUCCESS;
}
simdjson_inline uint8_t *tape_builder::on_start_string(json_iterator &iter) noexcept {
// we advance the point, accounting for the fact that we have a NULL termination
tape.append(current_string_buf_loc - iter.dom_parser.doc->string_buf.get(), internal::tape_type::STRING);
return current_string_buf_loc + sizeof(uint32_t);
}
simdjson_inline void tape_builder::on_end_string(uint8_t *dst) noexcept {
uint32_t str_length = uint32_t(dst - (current_string_buf_loc + sizeof(uint32_t)));
// TODO check for overflow in case someone has a crazy string (>=4GB?)
// But only add the overflow check when the document itself exceeds 4GB
// Currently unneeded because we refuse to parse docs larger or equal to 4GB.
memcpy(current_string_buf_loc, &str_length, sizeof(uint32_t));
// NULL termination is still handy if you expect all your strings to
// be NULL terminated? It comes at a small cost
*dst = 0;
current_string_buf_loc = dst + 1;
}
} // namespace stage2
} // unnamed namespace
} // namespace icelake
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE2_TAPE_BUILDER_H
/* end file generic/stage2/tape_builder.h for icelake */
/* end file generic/stage2/amalgamated.h for icelake */
#undef SIMDJSON_GENERIC_JSON_STRUCTURAL_INDEXER_CUSTOM_BIT_INDEXER
//
// Stage 1
//
namespace simdjson {
namespace icelake {
simdjson_warn_unused error_code implementation::create_dom_parser_implementation(
size_t capacity,
size_t max_depth,
std::unique_ptr<internal::dom_parser_implementation>& dst
) const noexcept {
dst.reset( new (std::nothrow) dom_parser_implementation() );
if (!dst) { return MEMALLOC; }
if (auto err = dst->set_capacity(capacity))
return err;
if (auto err = dst->set_max_depth(max_depth))
return err;
return SUCCESS;
}
namespace {
using namespace simd;
// This identifies structural characters (comma, colon, braces, brackets),
// and ASCII white-space ('\r','\n','\t',' ').
simdjson_inline json_character_block json_character_block::classify(const simd::simd8x64<uint8_t>& in) {
// These lookups rely on the fact that anything < 127 will match the lower 4 bits, which is why
// we can't use the generic lookup_16.
const auto whitespace_table = simd8<uint8_t>::repeat_16(' ', 100, 100, 100, 17, 100, 113, 2, 100, '\t', '\n', 112, 100, '\r', 100, 100);
// The 6 operators (:,[]{}) have these values:
//
// , 2C
// : 3A
// [ 5B
// { 7B
// ] 5D
// } 7D
//
// If you use | 0x20 to turn [ and ] into { and }, the lower 4 bits of each character is unique.
// We exploit this, using a simd 4-bit lookup to tell us which character match against, and then
// match it (against | 0x20).
//
// To prevent recognizing other characters, everything else gets compared with 0, which cannot
// match due to the | 0x20.
//
// NOTE: Due to the | 0x20, this ALSO treats <FF> and <SUB> (control characters 0C and 1A) like ,
// and :. This gets caught in stage 2, which checks the actual character to ensure the right
// operators are in the right places.
const auto op_table = simd8<uint8_t>::repeat_16(
0, 0, 0, 0,
0, 0, 0, 0,
0, 0, ':', '{', // : = 3A, [ = 5B, { = 7B
',', '}', 0, 0 // , = 2C, ] = 5D, } = 7D
);
// We compute whitespace and op separately. If later code only uses one or the
// other, given the fact that all functions are aggressively inlined, we can
// hope that useless computations will be omitted. This is namely case when
// minifying (we only need whitespace).
const uint64_t whitespace = in.eq({
_mm512_shuffle_epi8(whitespace_table, in.chunks[0])
});
// Turn [ and ] into { and }
const simd8x64<uint8_t> curlified{
in.chunks[0] | 0x20
};
const uint64_t op = curlified.eq({
_mm512_shuffle_epi8(op_table, in.chunks[0])
});
return { whitespace, op };
}
simdjson_inline bool is_ascii(const simd8x64<uint8_t>& input) {
return input.reduce_or().is_ascii();
}
simdjson_unused simdjson_inline simd8<bool> must_be_continuation(const simd8<uint8_t> prev1, const simd8<uint8_t> prev2, const simd8<uint8_t> prev3) {
simd8<uint8_t> is_second_byte = prev1.saturating_sub(0xc0u-1); // Only 11______ will be > 0
simd8<uint8_t> is_third_byte = prev2.saturating_sub(0xe0u-1); // Only 111_____ will be > 0
simd8<uint8_t> is_fourth_byte = prev3.saturating_sub(0xf0u-1); // Only 1111____ will be > 0
// Caller requires a bool (all 1's). All values resulting from the subtraction will be <= 64, so signed comparison is fine.
return simd8<int8_t>(is_second_byte | is_third_byte | is_fourth_byte) > int8_t(0);
}
simdjson_inline simd8<uint8_t> must_be_2_3_continuation(const simd8<uint8_t> prev2, const simd8<uint8_t> prev3) {
simd8<uint8_t> is_third_byte = prev2.saturating_sub(0xe0u-0x80); // Only 111_____ will be >= 0x80
simd8<uint8_t> is_fourth_byte = prev3.saturating_sub(0xf0u-0x80); // Only 1111____ will be >= 0x80
return is_third_byte | is_fourth_byte;
}
} // unnamed namespace
} // namespace icelake
} // namespace simdjson
/**
* We provide a custom version of bit_indexer::write using
* naked intrinsics.
* TODO: make this code more elegant.
*/
// Under GCC 12, the intrinsic _mm512_extracti32x4_epi32 may generate 'maybe uninitialized'.
// as a workaround, we disable warnings within the following function.
SIMDJSON_PUSH_DISABLE_ALL_WARNINGS
namespace simdjson { namespace icelake { namespace { namespace stage1 {
simdjson_inline void bit_indexer::write(uint32_t idx, uint64_t bits) {
// In some instances, the next branch is expensive because it is mispredicted.
// Unfortunately, in other cases,
// it helps tremendously.
if (bits == 0) { return; }
const __m512i indexes = _mm512_maskz_compress_epi8(bits, _mm512_set_epi32(
0x3f3e3d3c, 0x3b3a3938, 0x37363534, 0x33323130,
0x2f2e2d2c, 0x2b2a2928, 0x27262524, 0x23222120,
0x1f1e1d1c, 0x1b1a1918, 0x17161514, 0x13121110,
0x0f0e0d0c, 0x0b0a0908, 0x07060504, 0x03020100
));
const __m512i start_index = _mm512_set1_epi32(idx);
const auto count = count_ones(bits);
__m512i t0 = _mm512_cvtepu8_epi32(_mm512_castsi512_si128(indexes));
_mm512_storeu_si512(this->tail, _mm512_add_epi32(t0, start_index));
if(count > 16) {
const __m512i t1 = _mm512_cvtepu8_epi32(_mm512_extracti32x4_epi32(indexes, 1));
_mm512_storeu_si512(this->tail + 16, _mm512_add_epi32(t1, start_index));
if(count > 32) {
const __m512i t2 = _mm512_cvtepu8_epi32(_mm512_extracti32x4_epi32(indexes, 2));
_mm512_storeu_si512(this->tail + 32, _mm512_add_epi32(t2, start_index));
if(count > 48) {
const __m512i t3 = _mm512_cvtepu8_epi32(_mm512_extracti32x4_epi32(indexes, 3));
_mm512_storeu_si512(this->tail + 48, _mm512_add_epi32(t3, start_index));
}
}
}
this->tail += count;
}
}}}}
SIMDJSON_POP_DISABLE_WARNINGS
//
// Stage 2
//
//
// Implementation-specific overrides
//
namespace simdjson {
namespace icelake {
simdjson_warn_unused error_code implementation::minify(const uint8_t *buf, size_t len, uint8_t *dst, size_t &dst_len) const noexcept {
return icelake::stage1::json_minifier::minify<128>(buf, len, dst, dst_len);
}
simdjson_warn_unused error_code dom_parser_implementation::stage1(const uint8_t *_buf, size_t _len, stage1_mode streaming) noexcept {
this->buf = _buf;
this->len = _len;
return icelake::stage1::json_structural_indexer::index<128>(_buf, _len, *this, streaming);
}
simdjson_warn_unused bool implementation::validate_utf8(const char *buf, size_t len) const noexcept {
return icelake::stage1::generic_validate_utf8(buf,len);
}
simdjson_warn_unused error_code dom_parser_implementation::stage2(dom::document &_doc) noexcept {
return stage2::tape_builder::parse_document<false>(*this, _doc);
}
simdjson_warn_unused error_code dom_parser_implementation::stage2_next(dom::document &_doc) noexcept {
return stage2::tape_builder::parse_document<true>(*this, _doc);
}
simdjson_warn_unused uint8_t *dom_parser_implementation::parse_string(const uint8_t *src, uint8_t *dst, bool replacement_char) const noexcept {
return icelake::stringparsing::parse_string(src, dst, replacement_char);
}
simdjson_warn_unused uint8_t *dom_parser_implementation::parse_wobbly_string(const uint8_t *src, uint8_t *dst) const noexcept {
return icelake::stringparsing::parse_wobbly_string(src, dst);
}
simdjson_warn_unused error_code dom_parser_implementation::parse(const uint8_t *_buf, size_t _len, dom::document &_doc) noexcept {
auto error = stage1(_buf, _len, stage1_mode::regular);
if (error) { return error; }
return stage2(_doc);
}
} // namespace icelake
} // namespace simdjson
/* including simdjson/icelake/end.h: #include <simdjson/icelake/end.h> */
/* begin file simdjson/icelake/end.h */
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/icelake/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#if !SIMDJSON_CAN_ALWAYS_RUN_ICELAKE
SIMDJSON_UNTARGET_REGION
#endif
/* undefining SIMDJSON_IMPLEMENTATION from "icelake" */
#undef SIMDJSON_IMPLEMENTATION
/* end file simdjson/icelake/end.h */
#endif // SIMDJSON_SRC_ICELAKE_CPP
/* end file icelake.cpp */
#endif
#if SIMDJSON_IMPLEMENTATION_PPC64
/* including ppc64.cpp: #include <ppc64.cpp> */
/* begin file ppc64.cpp */
#ifndef SIMDJSON_SRC_PPC64_CPP
#define SIMDJSON_SRC_PPC64_CPP
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include <base.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
/* including simdjson/ppc64.h: #include <simdjson/ppc64.h> */
/* begin file simdjson/ppc64.h */
#ifndef SIMDJSON_PPC64_H
#define SIMDJSON_PPC64_H
/* including simdjson/ppc64/begin.h: #include "simdjson/ppc64/begin.h" */
/* begin file simdjson/ppc64/begin.h */
/* defining SIMDJSON_IMPLEMENTATION to "ppc64" */
#define SIMDJSON_IMPLEMENTATION ppc64
/* including simdjson/ppc64/base.h: #include "simdjson/ppc64/base.h" */
/* begin file simdjson/ppc64/base.h */
#ifndef SIMDJSON_PPC64_BASE_H
#define SIMDJSON_PPC64_BASE_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
/**
* Implementation for ALTIVEC (PPC64).
*/
namespace ppc64 {
class implementation;
namespace {
namespace simd {
template <typename T> struct simd8;
template <typename T> struct simd8x64;
} // namespace simd
} // unnamed namespace
} // namespace ppc64
} // namespace simdjson
#endif // SIMDJSON_PPC64_BASE_H
/* end file simdjson/ppc64/base.h */
/* including simdjson/ppc64/intrinsics.h: #include "simdjson/ppc64/intrinsics.h" */
/* begin file simdjson/ppc64/intrinsics.h */
#ifndef SIMDJSON_PPC64_INTRINSICS_H
#define SIMDJSON_PPC64_INTRINSICS_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/ppc64/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
// This should be the correct header whether
// you use visual studio or other compilers.
#include <altivec.h>
// These are defined by altivec.h in GCC toolchain, it is safe to undef them.
#ifdef bool
#undef bool
#endif
#ifdef vector
#undef vector
#endif
static_assert(sizeof(__vector unsigned char) <= simdjson::SIMDJSON_PADDING, "insufficient padding for ppc64");
#endif // SIMDJSON_PPC64_INTRINSICS_H
/* end file simdjson/ppc64/intrinsics.h */
/* including simdjson/ppc64/bitmanipulation.h: #include "simdjson/ppc64/bitmanipulation.h" */
/* begin file simdjson/ppc64/bitmanipulation.h */
#ifndef SIMDJSON_PPC64_BITMANIPULATION_H
#define SIMDJSON_PPC64_BITMANIPULATION_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/ppc64/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace ppc64 {
namespace {
// We sometimes call trailing_zero on inputs that are zero,
// but the algorithms do not end up using the returned value.
// Sadly, sanitizers are not smart enough to figure it out.
SIMDJSON_NO_SANITIZE_UNDEFINED
// This function can be used safely even if not all bytes have been
// initialized.
// See issue https://github.com/simdjson/simdjson/issues/1965
SIMDJSON_NO_SANITIZE_MEMORY
simdjson_inline int trailing_zeroes(uint64_t input_num) {
#if SIMDJSON_REGULAR_VISUAL_STUDIO
unsigned long ret;
// Search the mask data from least significant bit (LSB)
// to the most significant bit (MSB) for a set bit (1).
_BitScanForward64(&ret, input_num);
return (int)ret;
#else // SIMDJSON_REGULAR_VISUAL_STUDIO
return __builtin_ctzll(input_num);
#endif // SIMDJSON_REGULAR_VISUAL_STUDIO
}
/* result might be undefined when input_num is zero */
simdjson_inline uint64_t clear_lowest_bit(uint64_t input_num) {
return input_num & (input_num - 1);
}
/* result might be undefined when input_num is zero */
simdjson_inline int leading_zeroes(uint64_t input_num) {
#if SIMDJSON_REGULAR_VISUAL_STUDIO
unsigned long leading_zero = 0;
// Search the mask data from most significant bit (MSB)
// to least significant bit (LSB) for a set bit (1).
if (_BitScanReverse64(&leading_zero, input_num))
return (int)(63 - leading_zero);
else
return 64;
#else
return __builtin_clzll(input_num);
#endif // SIMDJSON_REGULAR_VISUAL_STUDIO
}
#if SIMDJSON_REGULAR_VISUAL_STUDIO
simdjson_inline int count_ones(uint64_t input_num) {
// note: we do not support legacy 32-bit Windows in this kernel
return __popcnt64(input_num); // Visual Studio wants two underscores
}
#else
simdjson_inline int count_ones(uint64_t input_num) {
return __builtin_popcountll(input_num);
}
#endif
simdjson_inline bool add_overflow(uint64_t value1, uint64_t value2,
uint64_t *result) {
#if SIMDJSON_REGULAR_VISUAL_STUDIO
*result = value1 + value2;
return *result < value1;
#else
return __builtin_uaddll_overflow(value1, value2,
reinterpret_cast<unsigned long long *>(result));
#endif
}
} // unnamed namespace
} // namespace ppc64
} // namespace simdjson
#endif // SIMDJSON_PPC64_BITMANIPULATION_H
/* end file simdjson/ppc64/bitmanipulation.h */
/* including simdjson/ppc64/bitmask.h: #include "simdjson/ppc64/bitmask.h" */
/* begin file simdjson/ppc64/bitmask.h */
#ifndef SIMDJSON_PPC64_BITMASK_H
#define SIMDJSON_PPC64_BITMASK_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/ppc64/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace ppc64 {
namespace {
//
// Perform a "cumulative bitwise xor," flipping bits each time a 1 is
// encountered.
//
// For example, prefix_xor(00100100) == 00011100
//
simdjson_inline uint64_t prefix_xor(uint64_t bitmask) {
// You can use the version below, however gcc sometimes miscompiles
// vec_pmsum_be, it happens somewhere around between 8 and 9th version.
// The performance boost was not noticeable, falling back to a usual
// implementation.
// __vector unsigned long long all_ones = {~0ull, ~0ull};
// __vector unsigned long long mask = {bitmask, 0};
// // Clang and GCC return different values for pmsum for ull so cast it to one.
// // Generally it is not specified by ALTIVEC ISA what is returned by
// // vec_pmsum_be.
// #if defined(__LITTLE_ENDIAN__)
// return (uint64_t)(((__vector unsigned long long)vec_pmsum_be(all_ones, mask))[0]);
// #else
// return (uint64_t)(((__vector unsigned long long)vec_pmsum_be(all_ones, mask))[1]);
// #endif
bitmask ^= bitmask << 1;
bitmask ^= bitmask << 2;
bitmask ^= bitmask << 4;
bitmask ^= bitmask << 8;
bitmask ^= bitmask << 16;
bitmask ^= bitmask << 32;
return bitmask;
}
} // unnamed namespace
} // namespace ppc64
} // namespace simdjson
#endif
/* end file simdjson/ppc64/bitmask.h */
/* including simdjson/ppc64/numberparsing_defs.h: #include "simdjson/ppc64/numberparsing_defs.h" */
/* begin file simdjson/ppc64/numberparsing_defs.h */
#ifndef SIMDJSON_PPC64_NUMBERPARSING_DEFS_H
#define SIMDJSON_PPC64_NUMBERPARSING_DEFS_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/ppc64/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/ppc64/intrinsics.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/numberparsing_tables.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#include <cstring>
#if defined(__linux__)
#include <byteswap.h>
#elif defined(__FreeBSD__)
#include <sys/endian.h>
#endif
namespace simdjson {
namespace ppc64 {
namespace numberparsing {
// we don't have appropriate instructions, so let us use a scalar function
// credit: https://johnnylee-sde.github.io/Fast-numeric-string-to-int/
/** @private */
static simdjson_inline uint32_t parse_eight_digits_unrolled(const uint8_t *chars) {
uint64_t val;
std::memcpy(&val, chars, sizeof(uint64_t));
#ifdef __BIG_ENDIAN__
#if defined(__linux__)
val = bswap_64(val);
#elif defined(__FreeBSD__)
val = bswap64(val);
#endif
#endif
val = (val & 0x0F0F0F0F0F0F0F0F) * 2561 >> 8;
val = (val & 0x00FF00FF00FF00FF) * 6553601 >> 16;
return uint32_t((val & 0x0000FFFF0000FFFF) * 42949672960001 >> 32);
}
/** @private */
simdjson_inline internal::value128 full_multiplication(uint64_t value1, uint64_t value2) {
internal::value128 answer;
#if SIMDJSON_REGULAR_VISUAL_STUDIO || SIMDJSON_IS_32BITS
#ifdef _M_ARM64
// ARM64 has native support for 64-bit multiplications, no need to emultate
answer.high = __umulh(value1, value2);
answer.low = value1 * value2;
#else
answer.low = _umul128(value1, value2, &answer.high); // _umul128 not available on ARM64
#endif // _M_ARM64
#else // SIMDJSON_REGULAR_VISUAL_STUDIO || SIMDJSON_IS_32BITS
__uint128_t r = (static_cast<__uint128_t>(value1)) * value2;
answer.low = uint64_t(r);
answer.high = uint64_t(r >> 64);
#endif
return answer;
}
} // namespace numberparsing
} // namespace ppc64
} // namespace simdjson
#define SIMDJSON_SWAR_NUMBER_PARSING 1
#endif // SIMDJSON_PPC64_NUMBERPARSING_DEFS_H
/* end file simdjson/ppc64/numberparsing_defs.h */
/* including simdjson/ppc64/simd.h: #include "simdjson/ppc64/simd.h" */
/* begin file simdjson/ppc64/simd.h */
#ifndef SIMDJSON_PPC64_SIMD_H
#define SIMDJSON_PPC64_SIMD_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/ppc64/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/ppc64/bitmanipulation.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/simdprune_tables.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#include <type_traits>
namespace simdjson {
namespace ppc64 {
namespace {
namespace simd {
using __m128i = __vector unsigned char;
template <typename Child> struct base {
__m128i value;
// Zero constructor
simdjson_inline base() : value{__m128i()} {}
// Conversion from SIMD register
simdjson_inline base(const __m128i _value) : value(_value) {}
// Conversion to SIMD register
simdjson_inline operator const __m128i &() const {
return this->value;
}
simdjson_inline operator __m128i &() { return this->value; }
// Bit operations
simdjson_inline Child operator|(const Child other) const {
return vec_or(this->value, (__m128i)other);
}
simdjson_inline Child operator&(const Child other) const {
return vec_and(this->value, (__m128i)other);
}
simdjson_inline Child operator^(const Child other) const {
return vec_xor(this->value, (__m128i)other);
}
simdjson_inline Child bit_andnot(const Child other) const {
return vec_andc(this->value, (__m128i)other);
}
simdjson_inline Child &operator|=(const Child other) {
auto this_cast = static_cast<Child*>(this);
*this_cast = *this_cast | other;
return *this_cast;
}
simdjson_inline Child &operator&=(const Child other) {
auto this_cast = static_cast<Child*>(this);
*this_cast = *this_cast & other;
return *this_cast;
}
simdjson_inline Child &operator^=(const Child other) {
auto this_cast = static_cast<Child*>(this);
*this_cast = *this_cast ^ other;
return *this_cast;
}
};
template <typename T, typename Mask = simd8<bool>>
struct base8 : base<simd8<T>> {
typedef uint16_t bitmask_t;
typedef uint32_t bitmask2_t;
simdjson_inline base8() : base<simd8<T>>() {}
simdjson_inline base8(const __m128i _value) : base<simd8<T>>(_value) {}
friend simdjson_inline Mask operator==(const simd8<T> lhs, const simd8<T> rhs) {
return (__m128i)vec_cmpeq(lhs.value, (__m128i)rhs);
}
static const int SIZE = sizeof(base<simd8<T>>::value);
template <int N = 1>
simdjson_inline simd8<T> prev(simd8<T> prev_chunk) const {
__m128i chunk = this->value;
#ifdef __LITTLE_ENDIAN__
chunk = (__m128i)vec_reve(this->value);
prev_chunk = (__m128i)vec_reve((__m128i)prev_chunk);
#endif
chunk = (__m128i)vec_sld((__m128i)prev_chunk, (__m128i)chunk, 16 - N);
#ifdef __LITTLE_ENDIAN__
chunk = (__m128i)vec_reve((__m128i)chunk);
#endif
return chunk;
}
};
// SIMD byte mask type (returned by things like eq and gt)
template <> struct simd8<bool> : base8<bool> {
static simdjson_inline simd8<bool> splat(bool _value) {
return (__m128i)vec_splats((unsigned char)(-(!!_value)));
}
simdjson_inline simd8<bool>() : base8<bool>() {}
simdjson_inline simd8<bool>(const __m128i _value)
: base8<bool>(_value) {}
// Splat constructor
simdjson_inline simd8<bool>(bool _value)
: base8<bool>(splat(_value)) {}
simdjson_inline int to_bitmask() const {
__vector unsigned long long result;
const __m128i perm_mask = {0x78, 0x70, 0x68, 0x60, 0x58, 0x50, 0x48, 0x40,
0x38, 0x30, 0x28, 0x20, 0x18, 0x10, 0x08, 0x00};
result = ((__vector unsigned long long)vec_vbpermq((__m128i)this->value,
(__m128i)perm_mask));
#ifdef __LITTLE_ENDIAN__
return static_cast<int>(result[1]);
#else
return static_cast<int>(result[0]);
#endif
}
simdjson_inline bool any() const {
return !vec_all_eq(this->value, (__m128i)vec_splats(0));
}
simdjson_inline simd8<bool> operator~() const {
return this->value ^ (__m128i)splat(true);
}
};
template <typename T> struct base8_numeric : base8<T> {
static simdjson_inline simd8<T> splat(T value) {
(void)value;
return (__m128i)vec_splats(value);
}
static simdjson_inline simd8<T> zero() { return splat(0); }
static simdjson_inline simd8<T> load(const T values[16]) {
return (__m128i)(vec_vsx_ld(0, reinterpret_cast<const uint8_t *>(values)));
}
// Repeat 16 values as many times as necessary (usually for lookup tables)
static simdjson_inline simd8<T> repeat_16(T v0, T v1, T v2, T v3, T v4,
T v5, T v6, T v7, T v8, T v9,
T v10, T v11, T v12, T v13,
T v14, T v15) {
return simd8<T>(v0, v1, v2, v3, v4, v5, v6, v7, v8, v9, v10, v11, v12, v13,
v14, v15);
}
simdjson_inline base8_numeric() : base8<T>() {}
simdjson_inline base8_numeric(const __m128i _value)
: base8<T>(_value) {}
// Store to array
simdjson_inline void store(T dst[16]) const {
vec_vsx_st(this->value, 0, reinterpret_cast<__m128i *>(dst));
}
// Override to distinguish from bool version
simdjson_inline simd8<T> operator~() const { return *this ^ 0xFFu; }
// Addition/subtraction are the same for signed and unsigned
simdjson_inline simd8<T> operator+(const simd8<T> other) const {
return (__m128i)((__m128i)this->value + (__m128i)other);
}
simdjson_inline simd8<T> operator-(const simd8<T> other) const {
return (__m128i)((__m128i)this->value - (__m128i)other);
}
simdjson_inline simd8<T> &operator+=(const simd8<T> other) {
*this = *this + other;
return *static_cast<simd8<T> *>(this);
}
simdjson_inline simd8<T> &operator-=(const simd8<T> other) {
*this = *this - other;
return *static_cast<simd8<T> *>(this);
}
// Perform a lookup assuming the value is between 0 and 16 (undefined behavior
// for out of range values)
template <typename L>
simdjson_inline simd8<L> lookup_16(simd8<L> lookup_table) const {
return (__m128i)vec_perm((__m128i)lookup_table, (__m128i)lookup_table, this->value);
}
// Copies to 'output" all bytes corresponding to a 0 in the mask (interpreted
// as a bitset). Passing a 0 value for mask would be equivalent to writing out
// every byte to output. Only the first 16 - count_ones(mask) bytes of the
// result are significant but 16 bytes get written. Design consideration: it
// seems like a function with the signature simd8<L> compress(uint32_t mask)
// would be sensible, but the AVX ISA makes this kind of approach difficult.
template <typename L>
simdjson_inline void compress(uint16_t mask, L *output) const {
using internal::BitsSetTable256mul2;
using internal::pshufb_combine_table;
using internal::thintable_epi8;
// this particular implementation was inspired by work done by @animetosho
// we do it in two steps, first 8 bytes and then second 8 bytes
uint8_t mask1 = uint8_t(mask); // least significant 8 bits
uint8_t mask2 = uint8_t(mask >> 8); // most significant 8 bits
// next line just loads the 64-bit values thintable_epi8[mask1] and
// thintable_epi8[mask2] into a 128-bit register, using only
// two instructions on most compilers.
#ifdef __LITTLE_ENDIAN__
__m128i shufmask = (__m128i)(__vector unsigned long long){
thintable_epi8[mask1], thintable_epi8[mask2]};
#else
__m128i shufmask = (__m128i)(__vector unsigned long long){
thintable_epi8[mask2], thintable_epi8[mask1]};
shufmask = (__m128i)vec_reve((__m128i)shufmask);
#endif
// we increment by 0x08 the second half of the mask
shufmask = ((__m128i)shufmask) +
((__m128i)(__vector int){0, 0, 0x08080808, 0x08080808});
// this is the version "nearly pruned"
__m128i pruned = vec_perm(this->value, this->value, shufmask);
// we still need to put the two halves together.
// we compute the popcount of the first half:
int pop1 = BitsSetTable256mul2[mask1];
// then load the corresponding mask, what it does is to write
// only the first pop1 bytes from the first 8 bytes, and then
// it fills in with the bytes from the second 8 bytes + some filling
// at the end.
__m128i compactmask =
vec_vsx_ld(0, reinterpret_cast<const uint8_t *>(pshufb_combine_table + pop1 * 8));
__m128i answer = vec_perm(pruned, (__m128i)vec_splats(0), compactmask);
vec_vsx_st(answer, 0, reinterpret_cast<__m128i *>(output));
}
template <typename L>
simdjson_inline simd8<L>
lookup_16(L replace0, L replace1, L replace2, L replace3, L replace4,
L replace5, L replace6, L replace7, L replace8, L replace9,
L replace10, L replace11, L replace12, L replace13, L replace14,
L replace15) const {
return lookup_16(simd8<L>::repeat_16(
replace0, replace1, replace2, replace3, replace4, replace5, replace6,
replace7, replace8, replace9, replace10, replace11, replace12,
replace13, replace14, replace15));
}
};
// Signed bytes
template <> struct simd8<int8_t> : base8_numeric<int8_t> {
simdjson_inline simd8() : base8_numeric<int8_t>() {}
simdjson_inline simd8(const __m128i _value)
: base8_numeric<int8_t>(_value) {}
// Splat constructor
simdjson_inline simd8(int8_t _value) : simd8(splat(_value)) {}
// Array constructor
simdjson_inline simd8(const int8_t *values) : simd8(load(values)) {}
// Member-by-member initialization
simdjson_inline simd8(int8_t v0, int8_t v1, int8_t v2, int8_t v3,
int8_t v4, int8_t v5, int8_t v6, int8_t v7,
int8_t v8, int8_t v9, int8_t v10, int8_t v11,
int8_t v12, int8_t v13, int8_t v14, int8_t v15)
: simd8((__m128i)(__vector signed char){v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10, v11, v12, v13, v14,
v15}) {}
// Repeat 16 values as many times as necessary (usually for lookup tables)
simdjson_inline static simd8<int8_t>
repeat_16(int8_t v0, int8_t v1, int8_t v2, int8_t v3, int8_t v4, int8_t v5,
int8_t v6, int8_t v7, int8_t v8, int8_t v9, int8_t v10, int8_t v11,
int8_t v12, int8_t v13, int8_t v14, int8_t v15) {
return simd8<int8_t>(v0, v1, v2, v3, v4, v5, v6, v7, v8, v9, v10, v11, v12,
v13, v14, v15);
}
// Order-sensitive comparisons
simdjson_inline simd8<int8_t>
max_val(const simd8<int8_t> other) const {
return (__m128i)vec_max((__vector signed char)this->value,
(__vector signed char)(__m128i)other);
}
simdjson_inline simd8<int8_t>
min_val(const simd8<int8_t> other) const {
return (__m128i)vec_min((__vector signed char)this->value,
(__vector signed char)(__m128i)other);
}
simdjson_inline simd8<bool>
operator>(const simd8<int8_t> other) const {
return (__m128i)vec_cmpgt((__vector signed char)this->value,
(__vector signed char)(__m128i)other);
}
simdjson_inline simd8<bool>
operator<(const simd8<int8_t> other) const {
return (__m128i)vec_cmplt((__vector signed char)this->value,
(__vector signed char)(__m128i)other);
}
};
// Unsigned bytes
template <> struct simd8<uint8_t> : base8_numeric<uint8_t> {
simdjson_inline simd8() : base8_numeric<uint8_t>() {}
simdjson_inline simd8(const __m128i _value)
: base8_numeric<uint8_t>(_value) {}
// Splat constructor
simdjson_inline simd8(uint8_t _value) : simd8(splat(_value)) {}
// Array constructor
simdjson_inline simd8(const uint8_t *values) : simd8(load(values)) {}
// Member-by-member initialization
simdjson_inline
simd8(uint8_t v0, uint8_t v1, uint8_t v2, uint8_t v3, uint8_t v4, uint8_t v5,
uint8_t v6, uint8_t v7, uint8_t v8, uint8_t v9, uint8_t v10,
uint8_t v11, uint8_t v12, uint8_t v13, uint8_t v14, uint8_t v15)
: simd8((__m128i){v0, v1, v2, v3, v4, v5, v6, v7, v8, v9, v10, v11, v12,
v13, v14, v15}) {}
// Repeat 16 values as many times as necessary (usually for lookup tables)
simdjson_inline static simd8<uint8_t>
repeat_16(uint8_t v0, uint8_t v1, uint8_t v2, uint8_t v3, uint8_t v4,
uint8_t v5, uint8_t v6, uint8_t v7, uint8_t v8, uint8_t v9,
uint8_t v10, uint8_t v11, uint8_t v12, uint8_t v13, uint8_t v14,
uint8_t v15) {
return simd8<uint8_t>(v0, v1, v2, v3, v4, v5, v6, v7, v8, v9, v10, v11, v12,
v13, v14, v15);
}
// Saturated math
simdjson_inline simd8<uint8_t>
saturating_add(const simd8<uint8_t> other) const {
return (__m128i)vec_adds(this->value, (__m128i)other);
}
simdjson_inline simd8<uint8_t>
saturating_sub(const simd8<uint8_t> other) const {
return (__m128i)vec_subs(this->value, (__m128i)other);
}
// Order-specific operations
simdjson_inline simd8<uint8_t>
max_val(const simd8<uint8_t> other) const {
return (__m128i)vec_max(this->value, (__m128i)other);
}
simdjson_inline simd8<uint8_t>
min_val(const simd8<uint8_t> other) const {
return (__m128i)vec_min(this->value, (__m128i)other);
}
// Same as >, but only guarantees true is nonzero (< guarantees true = -1)
simdjson_inline simd8<uint8_t>
gt_bits(const simd8<uint8_t> other) const {
return this->saturating_sub(other);
}
// Same as <, but only guarantees true is nonzero (< guarantees true = -1)
simdjson_inline simd8<uint8_t>
lt_bits(const simd8<uint8_t> other) const {
return other.saturating_sub(*this);
}
simdjson_inline simd8<bool>
operator<=(const simd8<uint8_t> other) const {
return other.max_val(*this) == other;
}
simdjson_inline simd8<bool>
operator>=(const simd8<uint8_t> other) const {
return other.min_val(*this) == other;
}
simdjson_inline simd8<bool>
operator>(const simd8<uint8_t> other) const {
return this->gt_bits(other).any_bits_set();
}
simdjson_inline simd8<bool>
operator<(const simd8<uint8_t> other) const {
return this->gt_bits(other).any_bits_set();
}
// Bit-specific operations
simdjson_inline simd8<bool> bits_not_set() const {
return (__m128i)vec_cmpeq(this->value, (__m128i)vec_splats(uint8_t(0)));
}
simdjson_inline simd8<bool> bits_not_set(simd8<uint8_t> bits) const {
return (*this & bits).bits_not_set();
}
simdjson_inline simd8<bool> any_bits_set() const {
return ~this->bits_not_set();
}
simdjson_inline simd8<bool> any_bits_set(simd8<uint8_t> bits) const {
return ~this->bits_not_set(bits);
}
simdjson_inline bool bits_not_set_anywhere() const {
return vec_all_eq(this->value, (__m128i)vec_splats(0));
}
simdjson_inline bool any_bits_set_anywhere() const {
return !bits_not_set_anywhere();
}
simdjson_inline bool bits_not_set_anywhere(simd8<uint8_t> bits) const {
return vec_all_eq(vec_and(this->value, (__m128i)bits),
(__m128i)vec_splats(0));
}
simdjson_inline bool any_bits_set_anywhere(simd8<uint8_t> bits) const {
return !bits_not_set_anywhere(bits);
}
template <int N> simdjson_inline simd8<uint8_t> shr() const {
return simd8<uint8_t>(
(__m128i)vec_sr(this->value, (__m128i)vec_splat_u8(N)));
}
template <int N> simdjson_inline simd8<uint8_t> shl() const {
return simd8<uint8_t>(
(__m128i)vec_sl(this->value, (__m128i)vec_splat_u8(N)));
}
};
template <typename T> struct simd8x64 {
static constexpr int NUM_CHUNKS = 64 / sizeof(simd8<T>);
static_assert(NUM_CHUNKS == 4,
"PPC64 kernel should use four registers per 64-byte block.");
const simd8<T> chunks[NUM_CHUNKS];
simd8x64(const simd8x64<T> &o) = delete; // no copy allowed
simd8x64<T> &
operator=(const simd8<T>& other) = delete; // no assignment allowed
simd8x64() = delete; // no default constructor allowed
simdjson_inline simd8x64(const simd8<T> chunk0, const simd8<T> chunk1,
const simd8<T> chunk2, const simd8<T> chunk3)
: chunks{chunk0, chunk1, chunk2, chunk3} {}
simdjson_inline simd8x64(const T ptr[64])
: chunks{simd8<T>::load(ptr), simd8<T>::load(ptr + 16),
simd8<T>::load(ptr + 32), simd8<T>::load(ptr + 48)} {}
simdjson_inline void store(T ptr[64]) const {
this->chunks[0].store(ptr + sizeof(simd8<T>) * 0);
this->chunks[1].store(ptr + sizeof(simd8<T>) * 1);
this->chunks[2].store(ptr + sizeof(simd8<T>) * 2);
this->chunks[3].store(ptr + sizeof(simd8<T>) * 3);
}
simdjson_inline simd8<T> reduce_or() const {
return (this->chunks[0] | this->chunks[1]) |
(this->chunks[2] | this->chunks[3]);
}
simdjson_inline uint64_t compress(uint64_t mask, T *output) const {
this->chunks[0].compress(uint16_t(mask), output);
this->chunks[1].compress(uint16_t(mask >> 16),
output + 16 - count_ones(mask & 0xFFFF));
this->chunks[2].compress(uint16_t(mask >> 32),
output + 32 - count_ones(mask & 0xFFFFFFFF));
this->chunks[3].compress(uint16_t(mask >> 48),
output + 48 - count_ones(mask & 0xFFFFFFFFFFFF));
return 64 - count_ones(mask);
}
simdjson_inline uint64_t to_bitmask() const {
uint64_t r0 = uint32_t(this->chunks[0].to_bitmask());
uint64_t r1 = this->chunks[1].to_bitmask();
uint64_t r2 = this->chunks[2].to_bitmask();
uint64_t r3 = this->chunks[3].to_bitmask();
return r0 | (r1 << 16) | (r2 << 32) | (r3 << 48);
}
simdjson_inline uint64_t eq(const T m) const {
const simd8<T> mask = simd8<T>::splat(m);
return simd8x64<bool>(this->chunks[0] == mask, this->chunks[1] == mask,
this->chunks[2] == mask, this->chunks[3] == mask)
.to_bitmask();
}
simdjson_inline uint64_t eq(const simd8x64<uint8_t> &other) const {
return simd8x64<bool>(this->chunks[0] == other.chunks[0],
this->chunks[1] == other.chunks[1],
this->chunks[2] == other.chunks[2],
this->chunks[3] == other.chunks[3])
.to_bitmask();
}
simdjson_inline uint64_t lteq(const T m) const {
const simd8<T> mask = simd8<T>::splat(m);
return simd8x64<bool>(this->chunks[0] <= mask, this->chunks[1] <= mask,
this->chunks[2] <= mask, this->chunks[3] <= mask)
.to_bitmask();
}
}; // struct simd8x64<T>
} // namespace simd
} // unnamed namespace
} // namespace ppc64
} // namespace simdjson
#endif // SIMDJSON_PPC64_SIMD_INPUT_H
/* end file simdjson/ppc64/simd.h */
/* including simdjson/ppc64/stringparsing_defs.h: #include "simdjson/ppc64/stringparsing_defs.h" */
/* begin file simdjson/ppc64/stringparsing_defs.h */
#ifndef SIMDJSON_PPC64_STRINGPARSING_DEFS_H
#define SIMDJSON_PPC64_STRINGPARSING_DEFS_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/ppc64/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/ppc64/bitmanipulation.h" */
/* amalgamation skipped (editor-only): #include "simdjson/ppc64/simd.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace ppc64 {
namespace {
using namespace simd;
// Holds backslashes and quotes locations.
struct backslash_and_quote {
public:
static constexpr uint32_t BYTES_PROCESSED = 32;
simdjson_inline static backslash_and_quote
copy_and_find(const uint8_t *src, uint8_t *dst);
simdjson_inline bool has_quote_first() {
return ((bs_bits - 1) & quote_bits) != 0;
}
simdjson_inline bool has_backslash() { return bs_bits != 0; }
simdjson_inline int quote_index() {
return trailing_zeroes(quote_bits);
}
simdjson_inline int backslash_index() {
return trailing_zeroes(bs_bits);
}
uint32_t bs_bits;
uint32_t quote_bits;
}; // struct backslash_and_quote
simdjson_inline backslash_and_quote
backslash_and_quote::copy_and_find(const uint8_t *src, uint8_t *dst) {
// this can read up to 31 bytes beyond the buffer size, but we require
// SIMDJSON_PADDING of padding
static_assert(SIMDJSON_PADDING >= (BYTES_PROCESSED - 1),
"backslash and quote finder must process fewer than "
"SIMDJSON_PADDING bytes");
simd8<uint8_t> v0(src);
simd8<uint8_t> v1(src + sizeof(v0));
v0.store(dst);
v1.store(dst + sizeof(v0));
// Getting a 64-bit bitmask is much cheaper than multiple 16-bit bitmasks on
// PPC; therefore, we smash them together into a 64-byte mask and get the
// bitmask from there.
uint64_t bs_and_quote =
simd8x64<bool>(v0 == '\\', v1 == '\\', v0 == '"', v1 == '"').to_bitmask();
return {
uint32_t(bs_and_quote), // bs_bits
uint32_t(bs_and_quote >> 32) // quote_bits
};
}
} // unnamed namespace
} // namespace ppc64
} // namespace simdjson
#endif // SIMDJSON_PPC64_STRINGPARSING_DEFS_H
/* end file simdjson/ppc64/stringparsing_defs.h */
#define SIMDJSON_SKIP_BACKSLASH_SHORT_CIRCUIT 1
/* end file simdjson/ppc64/begin.h */
/* including simdjson/generic/amalgamated.h for ppc64: #include "simdjson/generic/amalgamated.h" */
/* begin file simdjson/generic/amalgamated.h for ppc64 */
#if defined(SIMDJSON_CONDITIONAL_INCLUDE) && !defined(SIMDJSON_GENERIC_DEPENDENCIES_H)
#error simdjson/generic/dependencies.h must be included before simdjson/generic/amalgamated.h!
#endif
/* including simdjson/generic/base.h for ppc64: #include "simdjson/generic/base.h" */
/* begin file simdjson/generic/base.h for ppc64 */
#ifndef SIMDJSON_GENERIC_BASE_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_GENERIC_BASE_H */
/* amalgamation skipped (editor-only): #include "simdjson/base.h" */
/* amalgamation skipped (editor-only): // If we haven't got an implementation yet, we're in the editor, editing a generic file! Just */
/* amalgamation skipped (editor-only): // use the most advanced one we can so the most possible stuff can be tested. */
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_IMPLEMENTATION */
/* amalgamation skipped (editor-only): #include "simdjson/implementation_detection.h" */
/* amalgamation skipped (editor-only): #if SIMDJSON_IMPLEMENTATION_ICELAKE */
/* amalgamation skipped (editor-only): #include "simdjson/icelake/begin.h" */
/* amalgamation skipped (editor-only): #elif SIMDJSON_IMPLEMENTATION_HASWELL */
/* amalgamation skipped (editor-only): #include "simdjson/haswell/begin.h" */
/* amalgamation skipped (editor-only): #elif SIMDJSON_IMPLEMENTATION_WESTMERE */
/* amalgamation skipped (editor-only): #include "simdjson/westmere/begin.h" */
/* amalgamation skipped (editor-only): #elif SIMDJSON_IMPLEMENTATION_ARM64 */
/* amalgamation skipped (editor-only): #include "simdjson/arm64/begin.h" */
/* amalgamation skipped (editor-only): #elif SIMDJSON_IMPLEMENTATION_PPC64 */
/* amalgamation skipped (editor-only): #include "simdjson/ppc64/begin.h" */
/* amalgamation skipped (editor-only): #elif SIMDJSON_IMPLEMENTATION_FALLBACK */
/* amalgamation skipped (editor-only): #include "simdjson/fallback/begin.h" */
/* amalgamation skipped (editor-only): #else */
/* amalgamation skipped (editor-only): #error "All possible implementations (including fallback) have been disabled! simdjson will not run." */
/* amalgamation skipped (editor-only): #endif */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_IMPLEMENTATION */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace ppc64 {
struct open_container;
class dom_parser_implementation;
/**
* The type of a JSON number
*/
enum class number_type {
floating_point_number=1, /// a binary64 number
signed_integer, /// a signed integer that fits in a 64-bit word using two's complement
unsigned_integer, /// a positive integer larger or equal to 1<<63
big_integer /// a big integer that does not fit in a 64-bit word
};
} // namespace ppc64
} // namespace simdjson
#endif // SIMDJSON_GENERIC_BASE_H
/* end file simdjson/generic/base.h for ppc64 */
/* including simdjson/generic/jsoncharutils.h for ppc64: #include "simdjson/generic/jsoncharutils.h" */
/* begin file simdjson/generic/jsoncharutils.h for ppc64 */
#ifndef SIMDJSON_GENERIC_JSONCHARUTILS_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_GENERIC_JSONCHARUTILS_H */
/* amalgamation skipped (editor-only): #include "simdjson/generic/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/jsoncharutils_tables.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/numberparsing_tables.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace ppc64 {
namespace {
namespace jsoncharutils {
// return non-zero if not a structural or whitespace char
// zero otherwise
simdjson_inline uint32_t is_not_structural_or_whitespace(uint8_t c) {
return internal::structural_or_whitespace_negated[c];
}
simdjson_inline uint32_t is_structural_or_whitespace(uint8_t c) {
return internal::structural_or_whitespace[c];
}
// returns a value with the high 16 bits set if not valid
// otherwise returns the conversion of the 4 hex digits at src into the bottom
// 16 bits of the 32-bit return register
//
// see
// https://lemire.me/blog/2019/04/17/parsing-short-hexadecimal-strings-efficiently/
static inline uint32_t hex_to_u32_nocheck(
const uint8_t *src) { // strictly speaking, static inline is a C-ism
uint32_t v1 = internal::digit_to_val32[630 + src[0]];
uint32_t v2 = internal::digit_to_val32[420 + src[1]];
uint32_t v3 = internal::digit_to_val32[210 + src[2]];
uint32_t v4 = internal::digit_to_val32[0 + src[3]];
return v1 | v2 | v3 | v4;
}
// given a code point cp, writes to c
// the utf-8 code, outputting the length in
// bytes, if the length is zero, the code point
// is invalid
//
// This can possibly be made faster using pdep
// and clz and table lookups, but JSON documents
// have few escaped code points, and the following
// function looks cheap.
//
// Note: we assume that surrogates are treated separately
//
simdjson_inline size_t codepoint_to_utf8(uint32_t cp, uint8_t *c) {
if (cp <= 0x7F) {
c[0] = uint8_t(cp);
return 1; // ascii
}
if (cp <= 0x7FF) {
c[0] = uint8_t((cp >> 6) + 192);
c[1] = uint8_t((cp & 63) + 128);
return 2; // universal plane
// Surrogates are treated elsewhere...
//} //else if (0xd800 <= cp && cp <= 0xdfff) {
// return 0; // surrogates // could put assert here
} else if (cp <= 0xFFFF) {
c[0] = uint8_t((cp >> 12) + 224);
c[1] = uint8_t(((cp >> 6) & 63) + 128);
c[2] = uint8_t((cp & 63) + 128);
return 3;
} else if (cp <= 0x10FFFF) { // if you know you have a valid code point, this
// is not needed
c[0] = uint8_t((cp >> 18) + 240);
c[1] = uint8_t(((cp >> 12) & 63) + 128);
c[2] = uint8_t(((cp >> 6) & 63) + 128);
c[3] = uint8_t((cp & 63) + 128);
return 4;
}
// will return 0 when the code point was too large.
return 0; // bad r
}
#if SIMDJSON_IS_32BITS // _umul128 for x86, arm
// this is a slow emulation routine for 32-bit
//
static simdjson_inline uint64_t __emulu(uint32_t x, uint32_t y) {
return x * (uint64_t)y;
}
static simdjson_inline uint64_t _umul128(uint64_t ab, uint64_t cd, uint64_t *hi) {
uint64_t ad = __emulu((uint32_t)(ab >> 32), (uint32_t)cd);
uint64_t bd = __emulu((uint32_t)ab, (uint32_t)cd);
uint64_t adbc = ad + __emulu((uint32_t)ab, (uint32_t)(cd >> 32));
uint64_t adbc_carry = !!(adbc < ad);
uint64_t lo = bd + (adbc << 32);
*hi = __emulu((uint32_t)(ab >> 32), (uint32_t)(cd >> 32)) + (adbc >> 32) +
(adbc_carry << 32) + !!(lo < bd);
return lo;
}
#endif
} // namespace jsoncharutils
} // unnamed namespace
} // namespace ppc64
} // namespace simdjson
#endif // SIMDJSON_GENERIC_JSONCHARUTILS_H
/* end file simdjson/generic/jsoncharutils.h for ppc64 */
/* including simdjson/generic/atomparsing.h for ppc64: #include "simdjson/generic/atomparsing.h" */
/* begin file simdjson/generic/atomparsing.h for ppc64 */
#ifndef SIMDJSON_GENERIC_ATOMPARSING_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_GENERIC_ATOMPARSING_H */
/* amalgamation skipped (editor-only): #include "simdjson/generic/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/generic/jsoncharutils.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#include <cstring>
namespace simdjson {
namespace ppc64 {
namespace {
/// @private
namespace atomparsing {
// The string_to_uint32 is exclusively used to map literal strings to 32-bit values.
// We use memcpy instead of a pointer cast to avoid undefined behaviors since we cannot
// be certain that the character pointer will be properly aligned.
// You might think that using memcpy makes this function expensive, but you'd be wrong.
// All decent optimizing compilers (GCC, clang, Visual Studio) will compile string_to_uint32("false");
// to the compile-time constant 1936482662.
simdjson_inline uint32_t string_to_uint32(const char* str) { uint32_t val; std::memcpy(&val, str, sizeof(uint32_t)); return val; }
// Again in str4ncmp we use a memcpy to avoid undefined behavior. The memcpy may appear expensive.
// Yet all decent optimizing compilers will compile memcpy to a single instruction, just about.
simdjson_warn_unused
simdjson_inline uint32_t str4ncmp(const uint8_t *src, const char* atom) {
uint32_t srcval; // we want to avoid unaligned 32-bit loads (undefined in C/C++)
static_assert(sizeof(uint32_t) <= SIMDJSON_PADDING, "SIMDJSON_PADDING must be larger than 4 bytes");
std::memcpy(&srcval, src, sizeof(uint32_t));
return srcval ^ string_to_uint32(atom);
}
simdjson_warn_unused
simdjson_inline bool is_valid_true_atom(const uint8_t *src) {
return (str4ncmp(src, "true") | jsoncharutils::is_not_structural_or_whitespace(src[4])) == 0;
}
simdjson_warn_unused
simdjson_inline bool is_valid_true_atom(const uint8_t *src, size_t len) {
if (len > 4) { return is_valid_true_atom(src); }
else if (len == 4) { return !str4ncmp(src, "true"); }
else { return false; }
}
simdjson_warn_unused
simdjson_inline bool is_valid_false_atom(const uint8_t *src) {
return (str4ncmp(src+1, "alse") | jsoncharutils::is_not_structural_or_whitespace(src[5])) == 0;
}
simdjson_warn_unused
simdjson_inline bool is_valid_false_atom(const uint8_t *src, size_t len) {
if (len > 5) { return is_valid_false_atom(src); }
else if (len == 5) { return !str4ncmp(src+1, "alse"); }
else { return false; }
}
simdjson_warn_unused
simdjson_inline bool is_valid_null_atom(const uint8_t *src) {
return (str4ncmp(src, "null") | jsoncharutils::is_not_structural_or_whitespace(src[4])) == 0;
}
simdjson_warn_unused
simdjson_inline bool is_valid_null_atom(const uint8_t *src, size_t len) {
if (len > 4) { return is_valid_null_atom(src); }
else if (len == 4) { return !str4ncmp(src, "null"); }
else { return false; }
}
} // namespace atomparsing
} // unnamed namespace
} // namespace ppc64
} // namespace simdjson
#endif // SIMDJSON_GENERIC_ATOMPARSING_H
/* end file simdjson/generic/atomparsing.h for ppc64 */
/* including simdjson/generic/dom_parser_implementation.h for ppc64: #include "simdjson/generic/dom_parser_implementation.h" */
/* begin file simdjson/generic/dom_parser_implementation.h for ppc64 */
#ifndef SIMDJSON_GENERIC_DOM_PARSER_IMPLEMENTATION_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_GENERIC_DOM_PARSER_IMPLEMENTATION_H */
/* amalgamation skipped (editor-only): #include "simdjson/generic/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/dom_parser_implementation.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace ppc64 {
// expectation: sizeof(open_container) = 64/8.
struct open_container {
uint32_t tape_index; // where, on the tape, does the scope ([,{) begins
uint32_t count; // how many elements in the scope
}; // struct open_container
static_assert(sizeof(open_container) == 64/8, "Open container must be 64 bits");
class dom_parser_implementation final : public internal::dom_parser_implementation {
public:
/** Tape location of each open { or [ */
std::unique_ptr<open_container[]> open_containers{};
/** Whether each open container is a [ or { */
std::unique_ptr<bool[]> is_array{};
/** Buffer passed to stage 1 */
const uint8_t *buf{};
/** Length passed to stage 1 */
size_t len{0};
/** Document passed to stage 2 */
dom::document *doc{};
inline dom_parser_implementation() noexcept;
inline dom_parser_implementation(dom_parser_implementation &&other) noexcept;
inline dom_parser_implementation &operator=(dom_parser_implementation &&other) noexcept;
dom_parser_implementation(const dom_parser_implementation &) = delete;
dom_parser_implementation &operator=(const dom_parser_implementation &) = delete;
simdjson_warn_unused error_code parse(const uint8_t *buf, size_t len, dom::document &doc) noexcept final;
simdjson_warn_unused error_code stage1(const uint8_t *buf, size_t len, stage1_mode partial) noexcept final;
simdjson_warn_unused error_code stage2(dom::document &doc) noexcept final;
simdjson_warn_unused error_code stage2_next(dom::document &doc) noexcept final;
simdjson_warn_unused uint8_t *parse_string(const uint8_t *src, uint8_t *dst, bool allow_replacement) const noexcept final;
simdjson_warn_unused uint8_t *parse_wobbly_string(const uint8_t *src, uint8_t *dst) const noexcept final;
inline simdjson_warn_unused error_code set_capacity(size_t capacity) noexcept final;
inline simdjson_warn_unused error_code set_max_depth(size_t max_depth) noexcept final;
private:
simdjson_inline simdjson_warn_unused error_code set_capacity_stage1(size_t capacity);
};
} // namespace ppc64
} // namespace simdjson
namespace simdjson {
namespace ppc64 {
inline dom_parser_implementation::dom_parser_implementation() noexcept = default;
inline dom_parser_implementation::dom_parser_implementation(dom_parser_implementation &&other) noexcept = default;
inline dom_parser_implementation &dom_parser_implementation::operator=(dom_parser_implementation &&other) noexcept = default;
// Leaving these here so they can be inlined if so desired
inline simdjson_warn_unused error_code dom_parser_implementation::set_capacity(size_t capacity) noexcept {
if(capacity > SIMDJSON_MAXSIZE_BYTES) { return CAPACITY; }
// Stage 1 index output
size_t max_structures = SIMDJSON_ROUNDUP_N(capacity, 64) + 2 + 7;
structural_indexes.reset( new (std::nothrow) uint32_t[max_structures] );
if (!structural_indexes) { _capacity = 0; return MEMALLOC; }
structural_indexes[0] = 0;
n_structural_indexes = 0;
_capacity = capacity;
return SUCCESS;
}
inline simdjson_warn_unused error_code dom_parser_implementation::set_max_depth(size_t max_depth) noexcept {
// Stage 2 stacks
open_containers.reset(new (std::nothrow) open_container[max_depth]);
is_array.reset(new (std::nothrow) bool[max_depth]);
if (!is_array || !open_containers) { _max_depth = 0; return MEMALLOC; }
_max_depth = max_depth;
return SUCCESS;
}
} // namespace ppc64
} // namespace simdjson
#endif // SIMDJSON_GENERIC_DOM_PARSER_IMPLEMENTATION_H
/* end file simdjson/generic/dom_parser_implementation.h for ppc64 */
/* including simdjson/generic/implementation_simdjson_result_base.h for ppc64: #include "simdjson/generic/implementation_simdjson_result_base.h" */
/* begin file simdjson/generic/implementation_simdjson_result_base.h for ppc64 */
#ifndef SIMDJSON_GENERIC_IMPLEMENTATION_SIMDJSON_RESULT_BASE_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_GENERIC_IMPLEMENTATION_SIMDJSON_RESULT_BASE_H */
/* amalgamation skipped (editor-only): #include "simdjson/generic/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace ppc64 {
// This is a near copy of include/error.h's implementation_simdjson_result_base, except it doesn't use std::pair
// so we can avoid inlining errors
// TODO reconcile these!
/**
* The result of a simdjson operation that could fail.
*
* Gives the option of reading error codes, or throwing an exception by casting to the desired result.
*
* This is a base class for implementations that want to add functions to the result type for
* chaining.
*
* Override like:
*
* struct simdjson_result<T> : public internal::implementation_simdjson_result_base<T> {
* simdjson_result() noexcept : internal::implementation_simdjson_result_base<T>() {}
* simdjson_result(error_code error) noexcept : internal::implementation_simdjson_result_base<T>(error) {}
* simdjson_result(T &&value) noexcept : internal::implementation_simdjson_result_base<T>(std::forward(value)) {}
* simdjson_result(T &&value, error_code error) noexcept : internal::implementation_simdjson_result_base<T>(value, error) {}
* // Your extra methods here
* }
*
* Then any method returning simdjson_result<T> will be chainable with your methods.
*/
template<typename T>
struct implementation_simdjson_result_base {
/**
* Create a new empty result with error = UNINITIALIZED.
*/
simdjson_inline implementation_simdjson_result_base() noexcept = default;
/**
* Create a new error result.
*/
simdjson_inline implementation_simdjson_result_base(error_code error) noexcept;
/**
* Create a new successful result.
*/
simdjson_inline implementation_simdjson_result_base(T &&value) noexcept;
/**
* Create a new result with both things (use if you don't want to branch when creating the result).
*/
simdjson_inline implementation_simdjson_result_base(T &&value, error_code error) noexcept;
/**
* Move the value and the error to the provided variables.
*
* @param value The variable to assign the value to. May not be set if there is an error.
* @param error The variable to assign the error to. Set to SUCCESS if there is no error.
*/
simdjson_inline void tie(T &value, error_code &error) && noexcept;
/**
* Move the value to the provided variable.
*
* @param value The variable to assign the value to. May not be set if there is an error.
*/
simdjson_inline error_code get(T &value) && noexcept;
/**
* The error.
*/
simdjson_inline error_code error() const noexcept;
#if SIMDJSON_EXCEPTIONS
/**
* Get the result value.
*
* @throw simdjson_error if there was an error.
*/
simdjson_inline T& value() & noexcept(false);
/**
* Take the result value (move it).
*
* @throw simdjson_error if there was an error.
*/
simdjson_inline T&& value() && noexcept(false);
/**
* Take the result value (move it).
*
* @throw simdjson_error if there was an error.
*/
simdjson_inline T&& take_value() && noexcept(false);
/**
* Cast to the value (will throw on error).
*
* @throw simdjson_error if there was an error.
*/
simdjson_inline operator T&&() && noexcept(false);
#endif // SIMDJSON_EXCEPTIONS
/**
* Get the result value. This function is safe if and only
* the error() method returns a value that evaluates to false.
*/
simdjson_inline const T& value_unsafe() const& noexcept;
/**
* Get the result value. This function is safe if and only
* the error() method returns a value that evaluates to false.
*/
simdjson_inline T& value_unsafe() & noexcept;
/**
* Take the result value (move it). This function is safe if and only
* the error() method returns a value that evaluates to false.
*/
simdjson_inline T&& value_unsafe() && noexcept;
protected:
/** users should never directly access first and second. **/
T first{}; /** Users should never directly access 'first'. **/
error_code second{UNINITIALIZED}; /** Users should never directly access 'second'. **/
}; // struct implementation_simdjson_result_base
} // namespace ppc64
} // namespace simdjson
#endif // SIMDJSON_GENERIC_IMPLEMENTATION_SIMDJSON_RESULT_BASE_H
/* end file simdjson/generic/implementation_simdjson_result_base.h for ppc64 */
/* including simdjson/generic/numberparsing.h for ppc64: #include "simdjson/generic/numberparsing.h" */
/* begin file simdjson/generic/numberparsing.h for ppc64 */
#ifndef SIMDJSON_GENERIC_NUMBERPARSING_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_GENERIC_NUMBERPARSING_H */
/* amalgamation skipped (editor-only): #include "simdjson/generic/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/generic/jsoncharutils.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/numberparsing_tables.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#include <limits>
#include <ostream>
#include <cstring>
namespace simdjson {
namespace ppc64 {
namespace numberparsing {
#ifdef JSON_TEST_NUMBERS
#define INVALID_NUMBER(SRC) (found_invalid_number((SRC)), NUMBER_ERROR)
#define WRITE_INTEGER(VALUE, SRC, WRITER) (found_integer((VALUE), (SRC)), (WRITER).append_s64((VALUE)))
#define WRITE_UNSIGNED(VALUE, SRC, WRITER) (found_unsigned_integer((VALUE), (SRC)), (WRITER).append_u64((VALUE)))
#define WRITE_DOUBLE(VALUE, SRC, WRITER) (found_float((VALUE), (SRC)), (WRITER).append_double((VALUE)))
#define BIGINT_NUMBER(SRC) (found_invalid_number((SRC)), BIGINT_ERROR)
#else
#define INVALID_NUMBER(SRC) (NUMBER_ERROR)
#define WRITE_INTEGER(VALUE, SRC, WRITER) (WRITER).append_s64((VALUE))
#define WRITE_UNSIGNED(VALUE, SRC, WRITER) (WRITER).append_u64((VALUE))
#define WRITE_DOUBLE(VALUE, SRC, WRITER) (WRITER).append_double((VALUE))
#define BIGINT_NUMBER(SRC) (BIGINT_ERROR)
#endif
namespace {
// Convert a mantissa, an exponent and a sign bit into an ieee64 double.
// The real_exponent needs to be in [0, 2046] (technically real_exponent = 2047 would be acceptable).
// The mantissa should be in [0,1<<53). The bit at index (1ULL << 52) while be zeroed.
simdjson_inline double to_double(uint64_t mantissa, uint64_t real_exponent, bool negative) {
double d;
mantissa &= ~(1ULL << 52);
mantissa |= real_exponent << 52;
mantissa |= ((static_cast<uint64_t>(negative)) << 63);
std::memcpy(&d, &mantissa, sizeof(d));
return d;
}
// Attempts to compute i * 10^(power) exactly; and if "negative" is
// true, negate the result.
// This function will only work in some cases, when it does not work, success is
// set to false. This should work *most of the time* (like 99% of the time).
// We assume that power is in the [smallest_power,
// largest_power] interval: the caller is responsible for this check.
simdjson_inline bool compute_float_64(int64_t power, uint64_t i, bool negative, double &d) {
// we start with a fast path
// It was described in
// Clinger WD. How to read floating point numbers accurately.
// ACM SIGPLAN Notices. 1990
#ifndef FLT_EVAL_METHOD
#error "FLT_EVAL_METHOD should be defined, please include cfloat."
#endif
#if (FLT_EVAL_METHOD != 1) && (FLT_EVAL_METHOD != 0)
// We cannot be certain that x/y is rounded to nearest.
if (0 <= power && power <= 22 && i <= 9007199254740991)
#else
if (-22 <= power && power <= 22 && i <= 9007199254740991)
#endif
{
// convert the integer into a double. This is lossless since
// 0 <= i <= 2^53 - 1.
d = double(i);
//
// The general idea is as follows.
// If 0 <= s < 2^53 and if 10^0 <= p <= 10^22 then
// 1) Both s and p can be represented exactly as 64-bit floating-point
// values
// (binary64).
// 2) Because s and p can be represented exactly as floating-point values,
// then s * p
// and s / p will produce correctly rounded values.
//
if (power < 0) {
d = d / simdjson::internal::power_of_ten[-power];
} else {
d = d * simdjson::internal::power_of_ten[power];
}
if (negative) {
d = -d;
}
return true;
}
// When 22 < power && power < 22 + 16, we could
// hope for another, secondary fast path. It was
// described by David M. Gay in "Correctly rounded
// binary-decimal and decimal-binary conversions." (1990)
// If you need to compute i * 10^(22 + x) for x < 16,
// first compute i * 10^x, if you know that result is exact
// (e.g., when i * 10^x < 2^53),
// then you can still proceed and do (i * 10^x) * 10^22.
// Is this worth your time?
// You need 22 < power *and* power < 22 + 16 *and* (i * 10^(x-22) < 2^53)
// for this second fast path to work.
// If you you have 22 < power *and* power < 22 + 16, and then you
// optimistically compute "i * 10^(x-22)", there is still a chance that you
// have wasted your time if i * 10^(x-22) >= 2^53. It makes the use cases of
// this optimization maybe less common than we would like. Source:
// http://www.exploringbinary.com/fast-path-decimal-to-floating-point-conversion/
// also used in RapidJSON: https://rapidjson.org/strtod_8h_source.html
// The fast path has now failed, so we are failing back on the slower path.
// In the slow path, we need to adjust i so that it is > 1<<63 which is always
// possible, except if i == 0, so we handle i == 0 separately.
if(i == 0) {
d = negative ? -0.0 : 0.0;
return true;
}
// The exponent is 1024 + 63 + power
// + floor(log(5**power)/log(2)).
// The 1024 comes from the ieee64 standard.
// The 63 comes from the fact that we use a 64-bit word.
//
// Computing floor(log(5**power)/log(2)) could be
// slow. Instead we use a fast function.
//
// For power in (-400,350), we have that
// (((152170 + 65536) * power ) >> 16);
// is equal to
// floor(log(5**power)/log(2)) + power when power >= 0
// and it is equal to
// ceil(log(5**-power)/log(2)) + power when power < 0
//
// The 65536 is (1<<16) and corresponds to
// (65536 * power) >> 16 ---> power
//
// ((152170 * power ) >> 16) is equal to
// floor(log(5**power)/log(2))
//
// Note that this is not magic: 152170/(1<<16) is
// approximatively equal to log(5)/log(2).
// The 1<<16 value is a power of two; we could use a
// larger power of 2 if we wanted to.
//
int64_t exponent = (((152170 + 65536) * power) >> 16) + 1024 + 63;
// We want the most significant bit of i to be 1. Shift if needed.
int lz = leading_zeroes(i);
i <<= lz;
// We are going to need to do some 64-bit arithmetic to get a precise product.
// We use a table lookup approach.
// It is safe because
// power >= smallest_power
// and power <= largest_power
// We recover the mantissa of the power, it has a leading 1. It is always
// rounded down.
//
// We want the most significant 64 bits of the product. We know
// this will be non-zero because the most significant bit of i is
// 1.
const uint32_t index = 2 * uint32_t(power - simdjson::internal::smallest_power);
// Optimization: It may be that materializing the index as a variable might confuse some compilers and prevent effective complex-addressing loads. (Done for code clarity.)
//
// The full_multiplication function computes the 128-bit product of two 64-bit words
// with a returned value of type value128 with a "low component" corresponding to the
// 64-bit least significant bits of the product and with a "high component" corresponding
// to the 64-bit most significant bits of the product.
simdjson::internal::value128 firstproduct = full_multiplication(i, simdjson::internal::power_of_five_128[index]);
// Both i and power_of_five_128[index] have their most significant bit set to 1 which
// implies that the either the most or the second most significant bit of the product
// is 1. We pack values in this manner for efficiency reasons: it maximizes the use
// we make of the product. It also makes it easy to reason about the product: there
// is 0 or 1 leading zero in the product.
// Unless the least significant 9 bits of the high (64-bit) part of the full
// product are all 1s, then we know that the most significant 55 bits are
// exact and no further work is needed. Having 55 bits is necessary because
// we need 53 bits for the mantissa but we have to have one rounding bit and
// we can waste a bit if the most significant bit of the product is zero.
if((firstproduct.high & 0x1FF) == 0x1FF) {
// We want to compute i * 5^q, but only care about the top 55 bits at most.
// Consider the scenario where q>=0. Then 5^q may not fit in 64-bits. Doing
// the full computation is wasteful. So we do what is called a "truncated
// multiplication".
// We take the most significant 64-bits, and we put them in
// power_of_five_128[index]. Usually, that's good enough to approximate i * 5^q
// to the desired approximation using one multiplication. Sometimes it does not suffice.
// Then we store the next most significant 64 bits in power_of_five_128[index + 1], and
// then we get a better approximation to i * 5^q.
//
// That's for when q>=0. The logic for q<0 is somewhat similar but it is somewhat
// more complicated.
//
// There is an extra layer of complexity in that we need more than 55 bits of
// accuracy in the round-to-even scenario.
//
// The full_multiplication function computes the 128-bit product of two 64-bit words
// with a returned value of type value128 with a "low component" corresponding to the
// 64-bit least significant bits of the product and with a "high component" corresponding
// to the 64-bit most significant bits of the product.
simdjson::internal::value128 secondproduct = full_multiplication(i, simdjson::internal::power_of_five_128[index + 1]);
firstproduct.low += secondproduct.high;
if(secondproduct.high > firstproduct.low) { firstproduct.high++; }
// As it has been proven by Noble Mushtak and Daniel Lemire in "Fast Number Parsing Without
// Fallback" (https://arxiv.org/abs/2212.06644), at this point we are sure that the product
// is sufficiently accurate, and more computation is not needed.
}
uint64_t lower = firstproduct.low;
uint64_t upper = firstproduct.high;
// The final mantissa should be 53 bits with a leading 1.
// We shift it so that it occupies 54 bits with a leading 1.
///////
uint64_t upperbit = upper >> 63;
uint64_t mantissa = upper >> (upperbit + 9);
lz += int(1 ^ upperbit);
// Here we have mantissa < (1<<54).
int64_t real_exponent = exponent - lz;
if (simdjson_unlikely(real_exponent <= 0)) { // we have a subnormal?
// Here have that real_exponent <= 0 so -real_exponent >= 0
if(-real_exponent + 1 >= 64) { // if we have more than 64 bits below the minimum exponent, you have a zero for sure.
d = negative ? -0.0 : 0.0;
return true;
}
// next line is safe because -real_exponent + 1 < 0
mantissa >>= -real_exponent + 1;
// Thankfully, we can't have both "round-to-even" and subnormals because
// "round-to-even" only occurs for powers close to 0.
mantissa += (mantissa & 1); // round up
mantissa >>= 1;
// There is a weird scenario where we don't have a subnormal but just.
// Suppose we start with 2.2250738585072013e-308, we end up
// with 0x3fffffffffffff x 2^-1023-53 which is technically subnormal
// whereas 0x40000000000000 x 2^-1023-53 is normal. Now, we need to round
// up 0x3fffffffffffff x 2^-1023-53 and once we do, we are no longer
// subnormal, but we can only know this after rounding.
// So we only declare a subnormal if we are smaller than the threshold.
real_exponent = (mantissa < (uint64_t(1) << 52)) ? 0 : 1;
d = to_double(mantissa, real_exponent, negative);
return true;
}
// We have to round to even. The "to even" part
// is only a problem when we are right in between two floats
// which we guard against.
// If we have lots of trailing zeros, we may fall right between two
// floating-point values.
//
// The round-to-even cases take the form of a number 2m+1 which is in (2^53,2^54]
// times a power of two. That is, it is right between a number with binary significand
// m and another number with binary significand m+1; and it must be the case
// that it cannot be represented by a float itself.
//
// We must have that w * 10 ^q == (2m+1) * 2^p for some power of two 2^p.
// Recall that 10^q = 5^q * 2^q.
// When q >= 0, we must have that (2m+1) is divible by 5^q, so 5^q <= 2^54. We have that
// 5^23 <= 2^54 and it is the last power of five to qualify, so q <= 23.
// When q<0, we have w >= (2m+1) x 5^{-q}. We must have that w<2^{64} so
// (2m+1) x 5^{-q} < 2^{64}. We have that 2m+1>2^{53}. Hence, we must have
// 2^{53} x 5^{-q} < 2^{64}.
// Hence we have 5^{-q} < 2^{11}$ or q>= -4.
//
// We require lower <= 1 and not lower == 0 because we could not prove that
// that lower == 0 is implied; but we could prove that lower <= 1 is a necessary and sufficient test.
if (simdjson_unlikely((lower <= 1) && (power >= -4) && (power <= 23) && ((mantissa & 3) == 1))) {
if((mantissa << (upperbit + 64 - 53 - 2)) == upper) {
mantissa &= ~1; // flip it so that we do not round up
}
}
mantissa += mantissa & 1;
mantissa >>= 1;
// Here we have mantissa < (1<<53), unless there was an overflow
if (mantissa >= (1ULL << 53)) {
//////////
// This will happen when parsing values such as 7.2057594037927933e+16
////////
mantissa = (1ULL << 52);
real_exponent++;
}
mantissa &= ~(1ULL << 52);
// we have to check that real_exponent is in range, otherwise we bail out
if (simdjson_unlikely(real_exponent > 2046)) {
// We have an infinite value!!! We could actually throw an error here if we could.
return false;
}
d = to_double(mantissa, real_exponent, negative);
return true;
}
// We call a fallback floating-point parser that might be slow. Note
// it will accept JSON numbers, but the JSON spec. is more restrictive so
// before you call parse_float_fallback, you need to have validated the input
// string with the JSON grammar.
// It will return an error (false) if the parsed number is infinite.
// The string parsing itself always succeeds. We know that there is at least
// one digit.
static bool parse_float_fallback(const uint8_t *ptr, double *outDouble) {
*outDouble = simdjson::internal::from_chars(reinterpret_cast<const char *>(ptr));
// We do not accept infinite values.
// Detecting finite values in a portable manner is ridiculously hard, ideally
// we would want to do:
// return !std::isfinite(*outDouble);
// but that mysteriously fails under legacy/old libc++ libraries, see
// https://github.com/simdjson/simdjson/issues/1286
//
// Therefore, fall back to this solution (the extra parens are there
// to handle that max may be a macro on windows).
return !(*outDouble > (std::numeric_limits<double>::max)() || *outDouble < std::numeric_limits<double>::lowest());
}
static bool parse_float_fallback(const uint8_t *ptr, const uint8_t *end_ptr, double *outDouble) {
*outDouble = simdjson::internal::from_chars(reinterpret_cast<const char *>(ptr), reinterpret_cast<const char *>(end_ptr));
// We do not accept infinite values.
// Detecting finite values in a portable manner is ridiculously hard, ideally
// we would want to do:
// return !std::isfinite(*outDouble);
// but that mysteriously fails under legacy/old libc++ libraries, see
// https://github.com/simdjson/simdjson/issues/1286
//
// Therefore, fall back to this solution (the extra parens are there
// to handle that max may be a macro on windows).
return !(*outDouble > (std::numeric_limits<double>::max)() || *outDouble < std::numeric_limits<double>::lowest());
}
// check quickly whether the next 8 chars are made of digits
// at a glance, it looks better than Mula's
// http://0x80.pl/articles/swar-digits-validate.html
simdjson_inline bool is_made_of_eight_digits_fast(const uint8_t *chars) {
uint64_t val;
// this can read up to 7 bytes beyond the buffer size, but we require
// SIMDJSON_PADDING of padding
static_assert(7 <= SIMDJSON_PADDING, "SIMDJSON_PADDING must be bigger than 7");
std::memcpy(&val, chars, 8);
// a branchy method might be faster:
// return (( val & 0xF0F0F0F0F0F0F0F0 ) == 0x3030303030303030)
// && (( (val + 0x0606060606060606) & 0xF0F0F0F0F0F0F0F0 ) ==
// 0x3030303030303030);
return (((val & 0xF0F0F0F0F0F0F0F0) |
(((val + 0x0606060606060606) & 0xF0F0F0F0F0F0F0F0) >> 4)) ==
0x3333333333333333);
}
template<typename I>
SIMDJSON_NO_SANITIZE_UNDEFINED // We deliberately allow overflow here and check later
simdjson_inline bool parse_digit(const uint8_t c, I &i) {
const uint8_t digit = static_cast<uint8_t>(c - '0');
if (digit > 9) {
return false;
}
// PERF NOTE: multiplication by 10 is cheaper than arbitrary integer multiplication
i = 10 * i + digit; // might overflow, we will handle the overflow later
return true;
}
simdjson_inline bool is_digit(const uint8_t c) {
return static_cast<uint8_t>(c - '0') <= 9;
}
simdjson_inline error_code parse_decimal_after_separator(simdjson_unused const uint8_t *const src, const uint8_t *&p, uint64_t &i, int64_t &exponent) {
// we continue with the fiction that we have an integer. If the
// floating point number is representable as x * 10^z for some integer
// z that fits in 53 bits, then we will be able to convert back the
// the integer into a float in a lossless manner.
const uint8_t *const first_after_period = p;
#ifdef SIMDJSON_SWAR_NUMBER_PARSING
#if SIMDJSON_SWAR_NUMBER_PARSING
// this helps if we have lots of decimals!
// this turns out to be frequent enough.
if (is_made_of_eight_digits_fast(p)) {
i = i * 100000000 + parse_eight_digits_unrolled(p);
p += 8;
}
#endif // SIMDJSON_SWAR_NUMBER_PARSING
#endif // #ifdef SIMDJSON_SWAR_NUMBER_PARSING
// Unrolling the first digit makes a small difference on some implementations (e.g. westmere)
if (parse_digit(*p, i)) { ++p; }
while (parse_digit(*p, i)) { p++; }
exponent = first_after_period - p;
// Decimal without digits (123.) is illegal
if (exponent == 0) {
return INVALID_NUMBER(src);
}
return SUCCESS;
}
simdjson_inline error_code parse_exponent(simdjson_unused const uint8_t *const src, const uint8_t *&p, int64_t &exponent) {
// Exp Sign: -123.456e[-]78
bool neg_exp = ('-' == *p);
if (neg_exp || '+' == *p) { p++; } // Skip + as well
// Exponent: -123.456e-[78]
auto start_exp = p;
int64_t exp_number = 0;
while (parse_digit(*p, exp_number)) { ++p; }
// It is possible for parse_digit to overflow.
// In particular, it could overflow to INT64_MIN, and we cannot do - INT64_MIN.
// Thus we *must* check for possible overflow before we negate exp_number.
// Performance notes: it may seem like combining the two "simdjson_unlikely checks" below into
// a single simdjson_unlikely path would be faster. The reasoning is sound, but the compiler may
// not oblige and may, in fact, generate two distinct paths in any case. It might be
// possible to do uint64_t(p - start_exp - 1) >= 18 but it could end up trading off
// instructions for a simdjson_likely branch, an unconclusive gain.
// If there were no digits, it's an error.
if (simdjson_unlikely(p == start_exp)) {
return INVALID_NUMBER(src);
}
// We have a valid positive exponent in exp_number at this point, except that
// it may have overflowed.
// If there were more than 18 digits, we may have overflowed the integer. We have to do
// something!!!!
if (simdjson_unlikely(p > start_exp+18)) {
// Skip leading zeroes: 1e000000000000000000001 is technically valid and does not overflow
while (*start_exp == '0') { start_exp++; }
// 19 digits could overflow int64_t and is kind of absurd anyway. We don't
// support exponents smaller than -999,999,999,999,999,999 and bigger
// than 999,999,999,999,999,999.
// We can truncate.
// Note that 999999999999999999 is assuredly too large. The maximal ieee64 value before
// infinity is ~1.8e308. The smallest subnormal is ~5e-324. So, actually, we could
// truncate at 324.
// Note that there is no reason to fail per se at this point in time.
// E.g., 0e999999999999999999999 is a fine number.
if (p > start_exp+18) { exp_number = 999999999999999999; }
}
// At this point, we know that exp_number is a sane, positive, signed integer.
// It is <= 999,999,999,999,999,999. As long as 'exponent' is in
// [-8223372036854775808, 8223372036854775808], we won't overflow. Because 'exponent'
// is bounded in magnitude by the size of the JSON input, we are fine in this universe.
// To sum it up: the next line should never overflow.
exponent += (neg_exp ? -exp_number : exp_number);
return SUCCESS;
}
simdjson_inline bool check_if_integer(const uint8_t *const src, size_t max_length) {
const uint8_t *const srcend = src + max_length;
bool negative = (*src == '-'); // we can always read at least one character after the '-'
const uint8_t *p = src + uint8_t(negative);
if(p == srcend) { return false; }
if(*p == '0') {
++p;
if(p == srcend) { return true; }
if(jsoncharutils::is_not_structural_or_whitespace(*p)) { return false; }
return true;
}
while(p != srcend && is_digit(*p)) { ++p; }
if(p == srcend) { return true; }
if(jsoncharutils::is_not_structural_or_whitespace(*p)) { return false; }
return true;
}
simdjson_inline size_t significant_digits(const uint8_t * start_digits, size_t digit_count) {
// It is possible that the integer had an overflow.
// We have to handle the case where we have 0.0000somenumber.
const uint8_t *start = start_digits;
while ((*start == '0') || (*start == '.')) { ++start; }
// we over-decrement by one when there is a '.'
return digit_count - size_t(start - start_digits);
}
} // unnamed namespace
/** @private */
static error_code slow_float_parsing(simdjson_unused const uint8_t * src, double* answer) {
if (parse_float_fallback(src, answer)) {
return SUCCESS;
}
return INVALID_NUMBER(src);
}
/** @private */
template<typename W>
simdjson_inline error_code write_float(const uint8_t *const src, bool negative, uint64_t i, const uint8_t * start_digits, size_t digit_count, int64_t exponent, W &writer) {
// If we frequently had to deal with long strings of digits,
// we could extend our code by using a 128-bit integer instead
// of a 64-bit integer. However, this is uncommon in practice.
//
// 9999999999999999999 < 2**64 so we can accommodate 19 digits.
// If we have a decimal separator, then digit_count - 1 is the number of digits, but we
// may not have a decimal separator!
if (simdjson_unlikely(digit_count > 19 && significant_digits(start_digits, digit_count) > 19)) {
// Ok, chances are good that we had an overflow!
// this is almost never going to get called!!!
// we start anew, going slowly!!!
// This will happen in the following examples:
// 10000000000000000000000000000000000000000000e+308
// 3.1415926535897932384626433832795028841971693993751
//
// NOTE: We do not pass a reference to the to slow_float_parsing. If we passed our writer
// reference to it, it would force it to be stored in memory, preventing the compiler from
// picking it apart and putting into registers. i.e. if we pass it as reference,
// it gets slow.
double d;
error_code error = slow_float_parsing(src, &d);
writer.append_double(d);
return error;
}
// NOTE: it's weird that the simdjson_unlikely() only wraps half the if, but it seems to get slower any other
// way we've tried: https://github.com/simdjson/simdjson/pull/990#discussion_r448497331
// To future reader: we'd love if someone found a better way, or at least could explain this result!
if (simdjson_unlikely(exponent < simdjson::internal::smallest_power) || (exponent > simdjson::internal::largest_power)) {
//
// Important: smallest_power is such that it leads to a zero value.
// Observe that 18446744073709551615e-343 == 0, i.e. (2**64 - 1) e -343 is zero
// so something x 10^-343 goes to zero, but not so with something x 10^-342.
static_assert(simdjson::internal::smallest_power <= -342, "smallest_power is not small enough");
//
if((exponent < simdjson::internal::smallest_power) || (i == 0)) {
// E.g. Parse "-0.0e-999" into the same value as "-0.0". See https://en.wikipedia.org/wiki/Signed_zero
WRITE_DOUBLE(negative ? -0.0 : 0.0, src, writer);
return SUCCESS;
} else { // (exponent > largest_power) and (i != 0)
// We have, for sure, an infinite value and simdjson refuses to parse infinite values.
return INVALID_NUMBER(src);
}
}
double d;
if (!compute_float_64(exponent, i, negative, d)) {
// we are almost never going to get here.
if (!parse_float_fallback(src, &d)) { return INVALID_NUMBER(src); }
}
WRITE_DOUBLE(d, src, writer);
return SUCCESS;
}
// parse the number at src
// define JSON_TEST_NUMBERS for unit testing
//
// It is assumed that the number is followed by a structural ({,},],[) character
// or a white space character. If that is not the case (e.g., when the JSON
// document is made of a single number), then it is necessary to copy the
// content and append a space before calling this function.
//
// Our objective is accurate parsing (ULP of 0) at high speed.
template<typename W>
simdjson_inline error_code parse_number(const uint8_t *const src, W &writer);
// for performance analysis, it is sometimes useful to skip parsing
#ifdef SIMDJSON_SKIPNUMBERPARSING
template<typename W>
simdjson_inline error_code parse_number(const uint8_t *const, W &writer) {
writer.append_s64(0); // always write zero
return SUCCESS; // always succeeds
}
simdjson_unused simdjson_inline simdjson_result<uint64_t> parse_unsigned(const uint8_t * const src) noexcept { return 0; }
simdjson_unused simdjson_inline simdjson_result<int64_t> parse_integer(const uint8_t * const src) noexcept { return 0; }
simdjson_unused simdjson_inline simdjson_result<double> parse_double(const uint8_t * const src) noexcept { return 0; }
simdjson_unused simdjson_inline simdjson_result<uint64_t> parse_unsigned_in_string(const uint8_t * const src) noexcept { return 0; }
simdjson_unused simdjson_inline simdjson_result<int64_t> parse_integer_in_string(const uint8_t * const src) noexcept { return 0; }
simdjson_unused simdjson_inline simdjson_result<double> parse_double_in_string(const uint8_t * const src) noexcept { return 0; }
simdjson_unused simdjson_inline bool is_negative(const uint8_t * src) noexcept { return false; }
simdjson_unused simdjson_inline simdjson_result<bool> is_integer(const uint8_t * src) noexcept { return false; }
simdjson_unused simdjson_inline simdjson_result<number_type> get_number_type(const uint8_t * src) noexcept { return number_type::signed_integer; }
#else
// parse the number at src
// define JSON_TEST_NUMBERS for unit testing
//
// It is assumed that the number is followed by a structural ({,},],[) character
// or a white space character. If that is not the case (e.g., when the JSON
// document is made of a single number), then it is necessary to copy the
// content and append a space before calling this function.
//
// Our objective is accurate parsing (ULP of 0) at high speed.
template<typename W>
simdjson_inline error_code parse_number(const uint8_t *const src, W &writer) {
//
// Check for minus sign
//
bool negative = (*src == '-');
const uint8_t *p = src + uint8_t(negative);
//
// Parse the integer part.
//
// PERF NOTE: we don't use is_made_of_eight_digits_fast because large integers like 123456789 are rare
const uint8_t *const start_digits = p;
uint64_t i = 0;
while (parse_digit(*p, i)) { p++; }
// If there were no digits, or if the integer starts with 0 and has more than one digit, it's an error.
// Optimization note: size_t is expected to be unsigned.
size_t digit_count = size_t(p - start_digits);
if (digit_count == 0 || ('0' == *start_digits && digit_count > 1)) { return INVALID_NUMBER(src); }
//
// Handle floats if there is a . or e (or both)
//
int64_t exponent = 0;
bool is_float = false;
if ('.' == *p) {
is_float = true;
++p;
SIMDJSON_TRY( parse_decimal_after_separator(src, p, i, exponent) );
digit_count = int(p - start_digits); // used later to guard against overflows
}
if (('e' == *p) || ('E' == *p)) {
is_float = true;
++p;
SIMDJSON_TRY( parse_exponent(src, p, exponent) );
}
if (is_float) {
const bool dirty_end = jsoncharutils::is_not_structural_or_whitespace(*p);
SIMDJSON_TRY( write_float(src, negative, i, start_digits, digit_count, exponent, writer) );
if (dirty_end) { return INVALID_NUMBER(src); }
return SUCCESS;
}
// The longest negative 64-bit number is 19 digits.
// The longest positive 64-bit number is 20 digits.
// We do it this way so we don't trigger this branch unless we must.
size_t longest_digit_count = negative ? 19 : 20;
if (digit_count > longest_digit_count) { return BIGINT_NUMBER(src); }
if (digit_count == longest_digit_count) {
if (negative) {
// Anything negative above INT64_MAX+1 is invalid
if (i > uint64_t(INT64_MAX)+1) { return BIGINT_NUMBER(src); }
WRITE_INTEGER(~i+1, src, writer);
if (jsoncharutils::is_not_structural_or_whitespace(*p)) { return INVALID_NUMBER(src); }
return SUCCESS;
// Positive overflow check:
// - A 20 digit number starting with 2-9 is overflow, because 18,446,744,073,709,551,615 is the
// biggest uint64_t.
// - A 20 digit number starting with 1 is overflow if it is less than INT64_MAX.
// If we got here, it's a 20 digit number starting with the digit "1".
// - If a 20 digit number starting with 1 overflowed (i*10+digit), the result will be smaller
// than 1,553,255,926,290,448,384.
// - That is smaller than the smallest possible 20-digit number the user could write:
// 10,000,000,000,000,000,000.
// - Therefore, if the number is positive and lower than that, it's overflow.
// - The value we are looking at is less than or equal to INT64_MAX.
//
} else if (src[0] != uint8_t('1') || i <= uint64_t(INT64_MAX)) { return INVALID_NUMBER(src); }
}
// Write unsigned if it does not fit in a signed integer.
if (i > uint64_t(INT64_MAX)) {
WRITE_UNSIGNED(i, src, writer);
} else {
WRITE_INTEGER(negative ? (~i+1) : i, src, writer);
}
if (jsoncharutils::is_not_structural_or_whitespace(*p)) { return INVALID_NUMBER(src); }
return SUCCESS;
}
// Inlineable functions
namespace {
// This table can be used to characterize the final character of an integer
// string. For JSON structural character and allowable white space characters,
// we return SUCCESS. For 'e', '.' and 'E', we return INCORRECT_TYPE. Otherwise
// we return NUMBER_ERROR.
// Optimization note: we could easily reduce the size of the table by half (to 128)
// at the cost of an extra branch.
// Optimization note: we want the values to use at most 8 bits (not, e.g., 32 bits):
static_assert(error_code(uint8_t(NUMBER_ERROR))== NUMBER_ERROR, "bad NUMBER_ERROR cast");
static_assert(error_code(uint8_t(SUCCESS))== SUCCESS, "bad NUMBER_ERROR cast");
static_assert(error_code(uint8_t(INCORRECT_TYPE))== INCORRECT_TYPE, "bad NUMBER_ERROR cast");
const uint8_t integer_string_finisher[256] = {
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, SUCCESS,
SUCCESS, NUMBER_ERROR, NUMBER_ERROR, SUCCESS, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, SUCCESS, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, SUCCESS,
NUMBER_ERROR, INCORRECT_TYPE, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, SUCCESS, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, INCORRECT_TYPE,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, SUCCESS, NUMBER_ERROR, SUCCESS, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, INCORRECT_TYPE, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, SUCCESS, NUMBER_ERROR,
SUCCESS, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR};
// Parse any number from 0 to 18,446,744,073,709,551,615
simdjson_unused simdjson_inline simdjson_result<uint64_t> parse_unsigned(const uint8_t * const src) noexcept {
const uint8_t *p = src;
//
// Parse the integer part.
//
// PERF NOTE: we don't use is_made_of_eight_digits_fast because large integers like 123456789 are rare
const uint8_t *const start_digits = p;
uint64_t i = 0;
while (parse_digit(*p, i)) { p++; }
// If there were no digits, or if the integer starts with 0 and has more than one digit, it's an error.
// Optimization note: size_t is expected to be unsigned.
size_t digit_count = size_t(p - start_digits);
// The longest positive 64-bit number is 20 digits.
// We do it this way so we don't trigger this branch unless we must.
// Optimization note: the compiler can probably merge
// ((digit_count == 0) || (digit_count > 20))
// into a single branch since digit_count is unsigned.
if ((digit_count == 0) || (digit_count > 20)) { return INCORRECT_TYPE; }
// Here digit_count > 0.
if (('0' == *start_digits) && (digit_count > 1)) { return NUMBER_ERROR; }
// We can do the following...
// if (!jsoncharutils::is_structural_or_whitespace(*p)) {
// return (*p == '.' || *p == 'e' || *p == 'E') ? INCORRECT_TYPE : NUMBER_ERROR;
// }
// as a single table lookup:
if (integer_string_finisher[*p] != SUCCESS) { return error_code(integer_string_finisher[*p]); }
if (digit_count == 20) {
// Positive overflow check:
// - A 20 digit number starting with 2-9 is overflow, because 18,446,744,073,709,551,615 is the
// biggest uint64_t.
// - A 20 digit number starting with 1 is overflow if it is less than INT64_MAX.
// If we got here, it's a 20 digit number starting with the digit "1".
// - If a 20 digit number starting with 1 overflowed (i*10+digit), the result will be smaller
// than 1,553,255,926,290,448,384.
// - That is smaller than the smallest possible 20-digit number the user could write:
// 10,000,000,000,000,000,000.
// - Therefore, if the number is positive and lower than that, it's overflow.
// - The value we are looking at is less than or equal to INT64_MAX.
//
if (src[0] != uint8_t('1') || i <= uint64_t(INT64_MAX)) { return INCORRECT_TYPE; }
}
return i;
}
// Parse any number from 0 to 18,446,744,073,709,551,615
// Never read at src_end or beyond
simdjson_unused simdjson_inline simdjson_result<uint64_t> parse_unsigned(const uint8_t * const src, const uint8_t * const src_end) noexcept {
const uint8_t *p = src;
//
// Parse the integer part.
//
// PERF NOTE: we don't use is_made_of_eight_digits_fast because large integers like 123456789 are rare
const uint8_t *const start_digits = p;
uint64_t i = 0;
while ((p != src_end) && parse_digit(*p, i)) { p++; }
// If there were no digits, or if the integer starts with 0 and has more than one digit, it's an error.
// Optimization note: size_t is expected to be unsigned.
size_t digit_count = size_t(p - start_digits);
// The longest positive 64-bit number is 20 digits.
// We do it this way so we don't trigger this branch unless we must.
// Optimization note: the compiler can probably merge
// ((digit_count == 0) || (digit_count > 20))
// into a single branch since digit_count is unsigned.
if ((digit_count == 0) || (digit_count > 20)) { return INCORRECT_TYPE; }
// Here digit_count > 0.
if (('0' == *start_digits) && (digit_count > 1)) { return NUMBER_ERROR; }
// We can do the following...
// if (!jsoncharutils::is_structural_or_whitespace(*p)) {
// return (*p == '.' || *p == 'e' || *p == 'E') ? INCORRECT_TYPE : NUMBER_ERROR;
// }
// as a single table lookup:
if ((p != src_end) && integer_string_finisher[*p] != SUCCESS) { return error_code(integer_string_finisher[*p]); }
if (digit_count == 20) {
// Positive overflow check:
// - A 20 digit number starting with 2-9 is overflow, because 18,446,744,073,709,551,615 is the
// biggest uint64_t.
// - A 20 digit number starting with 1 is overflow if it is less than INT64_MAX.
// If we got here, it's a 20 digit number starting with the digit "1".
// - If a 20 digit number starting with 1 overflowed (i*10+digit), the result will be smaller
// than 1,553,255,926,290,448,384.
// - That is smaller than the smallest possible 20-digit number the user could write:
// 10,000,000,000,000,000,000.
// - Therefore, if the number is positive and lower than that, it's overflow.
// - The value we are looking at is less than or equal to INT64_MAX.
//
if (src[0] != uint8_t('1') || i <= uint64_t(INT64_MAX)) { return INCORRECT_TYPE; }
}
return i;
}
// Parse any number from 0 to 18,446,744,073,709,551,615
simdjson_unused simdjson_inline simdjson_result<uint64_t> parse_unsigned_in_string(const uint8_t * const src) noexcept {
const uint8_t *p = src + 1;
//
// Parse the integer part.
//
// PERF NOTE: we don't use is_made_of_eight_digits_fast because large integers like 123456789 are rare
const uint8_t *const start_digits = p;
uint64_t i = 0;
while (parse_digit(*p, i)) { p++; }
// If there were no digits, or if the integer starts with 0 and has more than one digit, it's an error.
// Optimization note: size_t is expected to be unsigned.
size_t digit_count = size_t(p - start_digits);
// The longest positive 64-bit number is 20 digits.
// We do it this way so we don't trigger this branch unless we must.
// Optimization note: the compiler can probably merge
// ((digit_count == 0) || (digit_count > 20))
// into a single branch since digit_count is unsigned.
if ((digit_count == 0) || (digit_count > 20)) { return INCORRECT_TYPE; }
// Here digit_count > 0.
if (('0' == *start_digits) && (digit_count > 1)) { return NUMBER_ERROR; }
// We can do the following...
// if (!jsoncharutils::is_structural_or_whitespace(*p)) {
// return (*p == '.' || *p == 'e' || *p == 'E') ? INCORRECT_TYPE : NUMBER_ERROR;
// }
// as a single table lookup:
if (*p != '"') { return NUMBER_ERROR; }
if (digit_count == 20) {
// Positive overflow check:
// - A 20 digit number starting with 2-9 is overflow, because 18,446,744,073,709,551,615 is the
// biggest uint64_t.
// - A 20 digit number starting with 1 is overflow if it is less than INT64_MAX.
// If we got here, it's a 20 digit number starting with the digit "1".
// - If a 20 digit number starting with 1 overflowed (i*10+digit), the result will be smaller
// than 1,553,255,926,290,448,384.
// - That is smaller than the smallest possible 20-digit number the user could write:
// 10,000,000,000,000,000,000.
// - Therefore, if the number is positive and lower than that, it's overflow.
// - The value we are looking at is less than or equal to INT64_MAX.
//
// Note: we use src[1] and not src[0] because src[0] is the quote character in this
// instance.
if (src[1] != uint8_t('1') || i <= uint64_t(INT64_MAX)) { return INCORRECT_TYPE; }
}
return i;
}
// Parse any number from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
simdjson_unused simdjson_inline simdjson_result<int64_t> parse_integer(const uint8_t *src) noexcept {
//
// Check for minus sign
//
bool negative = (*src == '-');
const uint8_t *p = src + uint8_t(negative);
//
// Parse the integer part.
//
// PERF NOTE: we don't use is_made_of_eight_digits_fast because large integers like 123456789 are rare
const uint8_t *const start_digits = p;
uint64_t i = 0;
while (parse_digit(*p, i)) { p++; }
// If there were no digits, or if the integer starts with 0 and has more than one digit, it's an error.
// Optimization note: size_t is expected to be unsigned.
size_t digit_count = size_t(p - start_digits);
// We go from
// -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
// so we can never represent numbers that have more than 19 digits.
size_t longest_digit_count = 19;
// Optimization note: the compiler can probably merge
// ((digit_count == 0) || (digit_count > longest_digit_count))
// into a single branch since digit_count is unsigned.
if ((digit_count == 0) || (digit_count > longest_digit_count)) { return INCORRECT_TYPE; }
// Here digit_count > 0.
if (('0' == *start_digits) && (digit_count > 1)) { return NUMBER_ERROR; }
// We can do the following...
// if (!jsoncharutils::is_structural_or_whitespace(*p)) {
// return (*p == '.' || *p == 'e' || *p == 'E') ? INCORRECT_TYPE : NUMBER_ERROR;
// }
// as a single table lookup:
if(integer_string_finisher[*p] != SUCCESS) { return error_code(integer_string_finisher[*p]); }
// Negative numbers have can go down to - INT64_MAX - 1 whereas positive numbers are limited to INT64_MAX.
// Performance note: This check is only needed when digit_count == longest_digit_count but it is
// so cheap that we might as well always make it.
if(i > uint64_t(INT64_MAX) + uint64_t(negative)) { return INCORRECT_TYPE; }
return negative ? (~i+1) : i;
}
// Parse any number from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
// Never read at src_end or beyond
simdjson_unused simdjson_inline simdjson_result<int64_t> parse_integer(const uint8_t * const src, const uint8_t * const src_end) noexcept {
//
// Check for minus sign
//
if(src == src_end) { return NUMBER_ERROR; }
bool negative = (*src == '-');
const uint8_t *p = src + uint8_t(negative);
//
// Parse the integer part.
//
// PERF NOTE: we don't use is_made_of_eight_digits_fast because large integers like 123456789 are rare
const uint8_t *const start_digits = p;
uint64_t i = 0;
while ((p != src_end) && parse_digit(*p, i)) { p++; }
// If there were no digits, or if the integer starts with 0 and has more than one digit, it's an error.
// Optimization note: size_t is expected to be unsigned.
size_t digit_count = size_t(p - start_digits);
// We go from
// -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
// so we can never represent numbers that have more than 19 digits.
size_t longest_digit_count = 19;
// Optimization note: the compiler can probably merge
// ((digit_count == 0) || (digit_count > longest_digit_count))
// into a single branch since digit_count is unsigned.
if ((digit_count == 0) || (digit_count > longest_digit_count)) { return INCORRECT_TYPE; }
// Here digit_count > 0.
if (('0' == *start_digits) && (digit_count > 1)) { return NUMBER_ERROR; }
// We can do the following...
// if (!jsoncharutils::is_structural_or_whitespace(*p)) {
// return (*p == '.' || *p == 'e' || *p == 'E') ? INCORRECT_TYPE : NUMBER_ERROR;
// }
// as a single table lookup:
if((p != src_end) && integer_string_finisher[*p] != SUCCESS) { return error_code(integer_string_finisher[*p]); }
// Negative numbers have can go down to - INT64_MAX - 1 whereas positive numbers are limited to INT64_MAX.
// Performance note: This check is only needed when digit_count == longest_digit_count but it is
// so cheap that we might as well always make it.
if(i > uint64_t(INT64_MAX) + uint64_t(negative)) { return INCORRECT_TYPE; }
return negative ? (~i+1) : i;
}
// Parse any number from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
simdjson_unused simdjson_inline simdjson_result<int64_t> parse_integer_in_string(const uint8_t *src) noexcept {
//
// Check for minus sign
//
bool negative = (*(src + 1) == '-');
src += uint8_t(negative) + 1;
//
// Parse the integer part.
//
// PERF NOTE: we don't use is_made_of_eight_digits_fast because large integers like 123456789 are rare
const uint8_t *const start_digits = src;
uint64_t i = 0;
while (parse_digit(*src, i)) { src++; }
// If there were no digits, or if the integer starts with 0 and has more than one digit, it's an error.
// Optimization note: size_t is expected to be unsigned.
size_t digit_count = size_t(src - start_digits);
// We go from
// -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
// so we can never represent numbers that have more than 19 digits.
size_t longest_digit_count = 19;
// Optimization note: the compiler can probably merge
// ((digit_count == 0) || (digit_count > longest_digit_count))
// into a single branch since digit_count is unsigned.
if ((digit_count == 0) || (digit_count > longest_digit_count)) { return INCORRECT_TYPE; }
// Here digit_count > 0.
if (('0' == *start_digits) && (digit_count > 1)) { return NUMBER_ERROR; }
// We can do the following...
// if (!jsoncharutils::is_structural_or_whitespace(*src)) {
// return (*src == '.' || *src == 'e' || *src == 'E') ? INCORRECT_TYPE : NUMBER_ERROR;
// }
// as a single table lookup:
if(*src != '"') { return NUMBER_ERROR; }
// Negative numbers have can go down to - INT64_MAX - 1 whereas positive numbers are limited to INT64_MAX.
// Performance note: This check is only needed when digit_count == longest_digit_count but it is
// so cheap that we might as well always make it.
if(i > uint64_t(INT64_MAX) + uint64_t(negative)) { return INCORRECT_TYPE; }
return negative ? (~i+1) : i;
}
simdjson_unused simdjson_inline simdjson_result<double> parse_double(const uint8_t * src) noexcept {
//
// Check for minus sign
//
bool negative = (*src == '-');
src += uint8_t(negative);
//
// Parse the integer part.
//
uint64_t i = 0;
const uint8_t *p = src;
p += parse_digit(*p, i);
bool leading_zero = (i == 0);
while (parse_digit(*p, i)) { p++; }
// no integer digits, or 0123 (zero must be solo)
if ( p == src ) { return INCORRECT_TYPE; }
if ( (leading_zero && p != src+1)) { return NUMBER_ERROR; }
//
// Parse the decimal part.
//
int64_t exponent = 0;
bool overflow;
if (simdjson_likely(*p == '.')) {
p++;
const uint8_t *start_decimal_digits = p;
if (!parse_digit(*p, i)) { return NUMBER_ERROR; } // no decimal digits
p++;
while (parse_digit(*p, i)) { p++; }
exponent = -(p - start_decimal_digits);
// Overflow check. More than 19 digits (minus the decimal) may be overflow.
overflow = p-src-1 > 19;
if (simdjson_unlikely(overflow && leading_zero)) {
// Skip leading 0.00000 and see if it still overflows
const uint8_t *start_digits = src + 2;
while (*start_digits == '0') { start_digits++; }
overflow = p-start_digits > 19;
}
} else {
overflow = p-src > 19;
}
//
// Parse the exponent
//
if (*p == 'e' || *p == 'E') {
p++;
bool exp_neg = *p == '-';
p += exp_neg || *p == '+';
uint64_t exp = 0;
const uint8_t *start_exp_digits = p;
while (parse_digit(*p, exp)) { p++; }
// no exp digits, or 20+ exp digits
if (p-start_exp_digits == 0 || p-start_exp_digits > 19) { return NUMBER_ERROR; }
exponent += exp_neg ? 0-exp : exp;
}
if (jsoncharutils::is_not_structural_or_whitespace(*p)) { return NUMBER_ERROR; }
overflow = overflow || exponent < simdjson::internal::smallest_power || exponent > simdjson::internal::largest_power;
//
// Assemble (or slow-parse) the float
//
double d;
if (simdjson_likely(!overflow)) {
if (compute_float_64(exponent, i, negative, d)) { return d; }
}
if (!parse_float_fallback(src - uint8_t(negative), &d)) {
return NUMBER_ERROR;
}
return d;
}
simdjson_unused simdjson_inline bool is_negative(const uint8_t * src) noexcept {
return (*src == '-');
}
simdjson_unused simdjson_inline simdjson_result<bool> is_integer(const uint8_t * src) noexcept {
bool negative = (*src == '-');
src += uint8_t(negative);
const uint8_t *p = src;
while(static_cast<uint8_t>(*p - '0') <= 9) { p++; }
if ( p == src ) { return NUMBER_ERROR; }
if (jsoncharutils::is_structural_or_whitespace(*p)) { return true; }
return false;
}
simdjson_unused simdjson_inline simdjson_result<number_type> get_number_type(const uint8_t * src) noexcept {
bool negative = (*src == '-');
src += uint8_t(negative);
const uint8_t *p = src;
while(static_cast<uint8_t>(*p - '0') <= 9) { p++; }
size_t digit_count = size_t(p - src);
if ( p == src ) { return NUMBER_ERROR; }
if (jsoncharutils::is_structural_or_whitespace(*p)) {
static const uint8_t * smaller_big_integer = reinterpret_cast<const uint8_t *>("9223372036854775808");
// We have an integer.
if(simdjson_unlikely(digit_count > 20)) {
return number_type::big_integer;
}
// If the number is negative and valid, it must be a signed integer.
if(negative) {
if (simdjson_unlikely(digit_count > 19)) return number_type::big_integer;
if (simdjson_unlikely(digit_count == 19 && memcmp(src, smaller_big_integer, 19) > 0)) {
return number_type::big_integer;
}
return number_type::signed_integer;
}
// Let us check if we have a big integer (>=2**64).
static const uint8_t * two_to_sixtyfour = reinterpret_cast<const uint8_t *>("18446744073709551616");
if((digit_count > 20) || (digit_count == 20 && memcmp(src, two_to_sixtyfour, 20) >= 0)) {
return number_type::big_integer;
}
// The number is positive and smaller than 18446744073709551616 (or 2**64).
// We want values larger or equal to 9223372036854775808 to be unsigned
// integers, and the other values to be signed integers.
if((digit_count == 20) || (digit_count >= 19 && memcmp(src, smaller_big_integer, 19) >= 0)) {
return number_type::unsigned_integer;
}
return number_type::signed_integer;
}
// Hopefully, we have 'e' or 'E' or '.'.
return number_type::floating_point_number;
}
// Never read at src_end or beyond
simdjson_unused simdjson_inline simdjson_result<double> parse_double(const uint8_t * src, const uint8_t * const src_end) noexcept {
if(src == src_end) { return NUMBER_ERROR; }
//
// Check for minus sign
//
bool negative = (*src == '-');
src += uint8_t(negative);
//
// Parse the integer part.
//
uint64_t i = 0;
const uint8_t *p = src;
if(p == src_end) { return NUMBER_ERROR; }
p += parse_digit(*p, i);
bool leading_zero = (i == 0);
while ((p != src_end) && parse_digit(*p, i)) { p++; }
// no integer digits, or 0123 (zero must be solo)
if ( p == src ) { return INCORRECT_TYPE; }
if ( (leading_zero && p != src+1)) { return NUMBER_ERROR; }
//
// Parse the decimal part.
//
int64_t exponent = 0;
bool overflow;
if (simdjson_likely((p != src_end) && (*p == '.'))) {
p++;
const uint8_t *start_decimal_digits = p;
if ((p == src_end) || !parse_digit(*p, i)) { return NUMBER_ERROR; } // no decimal digits
p++;
while ((p != src_end) && parse_digit(*p, i)) { p++; }
exponent = -(p - start_decimal_digits);
// Overflow check. More than 19 digits (minus the decimal) may be overflow.
overflow = p-src-1 > 19;
if (simdjson_unlikely(overflow && leading_zero)) {
// Skip leading 0.00000 and see if it still overflows
const uint8_t *start_digits = src + 2;
while (*start_digits == '0') { start_digits++; }
overflow = start_digits-src > 19;
}
} else {
overflow = p-src > 19;
}
//
// Parse the exponent
//
if ((p != src_end) && (*p == 'e' || *p == 'E')) {
p++;
if(p == src_end) { return NUMBER_ERROR; }
bool exp_neg = *p == '-';
p += exp_neg || *p == '+';
uint64_t exp = 0;
const uint8_t *start_exp_digits = p;
while ((p != src_end) && parse_digit(*p, exp)) { p++; }
// no exp digits, or 20+ exp digits
if (p-start_exp_digits == 0 || p-start_exp_digits > 19) { return NUMBER_ERROR; }
exponent += exp_neg ? 0-exp : exp;
}
if ((p != src_end) && jsoncharutils::is_not_structural_or_whitespace(*p)) { return NUMBER_ERROR; }
overflow = overflow || exponent < simdjson::internal::smallest_power || exponent > simdjson::internal::largest_power;
//
// Assemble (or slow-parse) the float
//
double d;
if (simdjson_likely(!overflow)) {
if (compute_float_64(exponent, i, negative, d)) { return d; }
}
if (!parse_float_fallback(src - uint8_t(negative), src_end, &d)) {
return NUMBER_ERROR;
}
return d;
}
simdjson_unused simdjson_inline simdjson_result<double> parse_double_in_string(const uint8_t * src) noexcept {
//
// Check for minus sign
//
bool negative = (*(src + 1) == '-');
src += uint8_t(negative) + 1;
//
// Parse the integer part.
//
uint64_t i = 0;
const uint8_t *p = src;
p += parse_digit(*p, i);
bool leading_zero = (i == 0);
while (parse_digit(*p, i)) { p++; }
// no integer digits, or 0123 (zero must be solo)
if ( p == src ) { return INCORRECT_TYPE; }
if ( (leading_zero && p != src+1)) { return NUMBER_ERROR; }
//
// Parse the decimal part.
//
int64_t exponent = 0;
bool overflow;
if (simdjson_likely(*p == '.')) {
p++;
const uint8_t *start_decimal_digits = p;
if (!parse_digit(*p, i)) { return NUMBER_ERROR; } // no decimal digits
p++;
while (parse_digit(*p, i)) { p++; }
exponent = -(p - start_decimal_digits);
// Overflow check. More than 19 digits (minus the decimal) may be overflow.
overflow = p-src-1 > 19;
if (simdjson_unlikely(overflow && leading_zero)) {
// Skip leading 0.00000 and see if it still overflows
const uint8_t *start_digits = src + 2;
while (*start_digits == '0') { start_digits++; }
overflow = p-start_digits > 19;
}
} else {
overflow = p-src > 19;
}
//
// Parse the exponent
//
if (*p == 'e' || *p == 'E') {
p++;
bool exp_neg = *p == '-';
p += exp_neg || *p == '+';
uint64_t exp = 0;
const uint8_t *start_exp_digits = p;
while (parse_digit(*p, exp)) { p++; }
// no exp digits, or 20+ exp digits
if (p-start_exp_digits == 0 || p-start_exp_digits > 19) { return NUMBER_ERROR; }
exponent += exp_neg ? 0-exp : exp;
}
if (*p != '"') { return NUMBER_ERROR; }
overflow = overflow || exponent < simdjson::internal::smallest_power || exponent > simdjson::internal::largest_power;
//
// Assemble (or slow-parse) the float
//
double d;
if (simdjson_likely(!overflow)) {
if (compute_float_64(exponent, i, negative, d)) { return d; }
}
if (!parse_float_fallback(src - uint8_t(negative), &d)) {
return NUMBER_ERROR;
}
return d;
}
} // unnamed namespace
#endif // SIMDJSON_SKIPNUMBERPARSING
} // namespace numberparsing
inline std::ostream& operator<<(std::ostream& out, number_type type) noexcept {
switch (type) {
case number_type::signed_integer: out << "integer in [-9223372036854775808,9223372036854775808)"; break;
case number_type::unsigned_integer: out << "unsigned integer in [9223372036854775808,18446744073709551616)"; break;
case number_type::floating_point_number: out << "floating-point number (binary64)"; break;
case number_type::big_integer: out << "big integer"; break;
default: SIMDJSON_UNREACHABLE();
}
return out;
}
} // namespace ppc64
} // namespace simdjson
#endif // SIMDJSON_GENERIC_NUMBERPARSING_H
/* end file simdjson/generic/numberparsing.h for ppc64 */
/* including simdjson/generic/implementation_simdjson_result_base-inl.h for ppc64: #include "simdjson/generic/implementation_simdjson_result_base-inl.h" */
/* begin file simdjson/generic/implementation_simdjson_result_base-inl.h for ppc64 */
#ifndef SIMDJSON_GENERIC_IMPLEMENTATION_SIMDJSON_RESULT_BASE_INL_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_GENERIC_IMPLEMENTATION_SIMDJSON_RESULT_BASE_INL_H */
/* amalgamation skipped (editor-only): #include "simdjson/generic/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/generic/implementation_simdjson_result_base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace ppc64 {
//
// internal::implementation_simdjson_result_base<T> inline implementation
//
template<typename T>
simdjson_inline void implementation_simdjson_result_base<T>::tie(T &value, error_code &error) && noexcept {
error = this->second;
if (!error) {
value = std::forward<implementation_simdjson_result_base<T>>(*this).first;
}
}
template<typename T>
simdjson_warn_unused simdjson_inline error_code implementation_simdjson_result_base<T>::get(T &value) && noexcept {
error_code error;
std::forward<implementation_simdjson_result_base<T>>(*this).tie(value, error);
return error;
}
template<typename T>
simdjson_inline error_code implementation_simdjson_result_base<T>::error() const noexcept {
return this->second;
}
#if SIMDJSON_EXCEPTIONS
template<typename T>
simdjson_inline T& implementation_simdjson_result_base<T>::value() & noexcept(false) {
if (error()) { throw simdjson_error(error()); }
return this->first;
}
template<typename T>
simdjson_inline T&& implementation_simdjson_result_base<T>::value() && noexcept(false) {
return std::forward<implementation_simdjson_result_base<T>>(*this).take_value();
}
template<typename T>
simdjson_inline T&& implementation_simdjson_result_base<T>::take_value() && noexcept(false) {
if (error()) { throw simdjson_error(error()); }
return std::forward<T>(this->first);
}
template<typename T>
simdjson_inline implementation_simdjson_result_base<T>::operator T&&() && noexcept(false) {
return std::forward<implementation_simdjson_result_base<T>>(*this).take_value();
}
#endif // SIMDJSON_EXCEPTIONS
template<typename T>
simdjson_inline const T& implementation_simdjson_result_base<T>::value_unsafe() const& noexcept {
return this->first;
}
template<typename T>
simdjson_inline T& implementation_simdjson_result_base<T>::value_unsafe() & noexcept {
return this->first;
}
template<typename T>
simdjson_inline T&& implementation_simdjson_result_base<T>::value_unsafe() && noexcept {
return std::forward<T>(this->first);
}
template<typename T>
simdjson_inline implementation_simdjson_result_base<T>::implementation_simdjson_result_base(T &&value, error_code error) noexcept
: first{std::forward<T>(value)}, second{error} {}
template<typename T>
simdjson_inline implementation_simdjson_result_base<T>::implementation_simdjson_result_base(error_code error) noexcept
: implementation_simdjson_result_base(T{}, error) {}
template<typename T>
simdjson_inline implementation_simdjson_result_base<T>::implementation_simdjson_result_base(T &&value) noexcept
: implementation_simdjson_result_base(std::forward<T>(value), SUCCESS) {}
} // namespace ppc64
} // namespace simdjson
#endif // SIMDJSON_GENERIC_IMPLEMENTATION_SIMDJSON_RESULT_BASE_INL_H
/* end file simdjson/generic/implementation_simdjson_result_base-inl.h for ppc64 */
/* end file simdjson/generic/amalgamated.h for ppc64 */
/* including simdjson/ppc64/end.h: #include "simdjson/ppc64/end.h" */
/* begin file simdjson/ppc64/end.h */
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/ppc64/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#undef SIMDJSON_SKIP_BACKSLASH_SHORT_CIRCUIT
/* undefining SIMDJSON_IMPLEMENTATION from "ppc64" */
#undef SIMDJSON_IMPLEMENTATION
/* end file simdjson/ppc64/end.h */
#endif // SIMDJSON_PPC64_H
/* end file simdjson/ppc64.h */
/* including simdjson/ppc64/implementation.h: #include <simdjson/ppc64/implementation.h> */
/* begin file simdjson/ppc64/implementation.h */
#ifndef SIMDJSON_PPC64_IMPLEMENTATION_H
#define SIMDJSON_PPC64_IMPLEMENTATION_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/ppc64/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/implementation.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/instruction_set.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
/**
* Implementation for ALTIVEC (PPC64).
*/
namespace ppc64 {
/**
* @private
*/
class implementation final : public simdjson::implementation {
public:
simdjson_inline implementation()
: simdjson::implementation("ppc64", "PPC64 ALTIVEC",
internal::instruction_set::ALTIVEC) {}
simdjson_warn_unused error_code create_dom_parser_implementation(
size_t capacity, size_t max_length,
std::unique_ptr<internal::dom_parser_implementation> &dst)
const noexcept final;
simdjson_warn_unused error_code minify(const uint8_t *buf, size_t len,
uint8_t *dst,
size_t &dst_len) const noexcept final;
simdjson_warn_unused bool validate_utf8(const char *buf,
size_t len) const noexcept final;
};
} // namespace ppc64
} // namespace simdjson
#endif // SIMDJSON_PPC64_IMPLEMENTATION_H
/* end file simdjson/ppc64/implementation.h */
/* including simdjson/ppc64/begin.h: #include <simdjson/ppc64/begin.h> */
/* begin file simdjson/ppc64/begin.h */
/* defining SIMDJSON_IMPLEMENTATION to "ppc64" */
#define SIMDJSON_IMPLEMENTATION ppc64
/* including simdjson/ppc64/base.h: #include "simdjson/ppc64/base.h" */
/* begin file simdjson/ppc64/base.h */
#ifndef SIMDJSON_PPC64_BASE_H
#define SIMDJSON_PPC64_BASE_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
/**
* Implementation for ALTIVEC (PPC64).
*/
namespace ppc64 {
class implementation;
namespace {
namespace simd {
template <typename T> struct simd8;
template <typename T> struct simd8x64;
} // namespace simd
} // unnamed namespace
} // namespace ppc64
} // namespace simdjson
#endif // SIMDJSON_PPC64_BASE_H
/* end file simdjson/ppc64/base.h */
/* including simdjson/ppc64/intrinsics.h: #include "simdjson/ppc64/intrinsics.h" */
/* begin file simdjson/ppc64/intrinsics.h */
#ifndef SIMDJSON_PPC64_INTRINSICS_H
#define SIMDJSON_PPC64_INTRINSICS_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/ppc64/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
// This should be the correct header whether
// you use visual studio or other compilers.
#include <altivec.h>
// These are defined by altivec.h in GCC toolchain, it is safe to undef them.
#ifdef bool
#undef bool
#endif
#ifdef vector
#undef vector
#endif
static_assert(sizeof(__vector unsigned char) <= simdjson::SIMDJSON_PADDING, "insufficient padding for ppc64");
#endif // SIMDJSON_PPC64_INTRINSICS_H
/* end file simdjson/ppc64/intrinsics.h */
/* including simdjson/ppc64/bitmanipulation.h: #include "simdjson/ppc64/bitmanipulation.h" */
/* begin file simdjson/ppc64/bitmanipulation.h */
#ifndef SIMDJSON_PPC64_BITMANIPULATION_H
#define SIMDJSON_PPC64_BITMANIPULATION_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/ppc64/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace ppc64 {
namespace {
// We sometimes call trailing_zero on inputs that are zero,
// but the algorithms do not end up using the returned value.
// Sadly, sanitizers are not smart enough to figure it out.
SIMDJSON_NO_SANITIZE_UNDEFINED
// This function can be used safely even if not all bytes have been
// initialized.
// See issue https://github.com/simdjson/simdjson/issues/1965
SIMDJSON_NO_SANITIZE_MEMORY
simdjson_inline int trailing_zeroes(uint64_t input_num) {
#if SIMDJSON_REGULAR_VISUAL_STUDIO
unsigned long ret;
// Search the mask data from least significant bit (LSB)
// to the most significant bit (MSB) for a set bit (1).
_BitScanForward64(&ret, input_num);
return (int)ret;
#else // SIMDJSON_REGULAR_VISUAL_STUDIO
return __builtin_ctzll(input_num);
#endif // SIMDJSON_REGULAR_VISUAL_STUDIO
}
/* result might be undefined when input_num is zero */
simdjson_inline uint64_t clear_lowest_bit(uint64_t input_num) {
return input_num & (input_num - 1);
}
/* result might be undefined when input_num is zero */
simdjson_inline int leading_zeroes(uint64_t input_num) {
#if SIMDJSON_REGULAR_VISUAL_STUDIO
unsigned long leading_zero = 0;
// Search the mask data from most significant bit (MSB)
// to least significant bit (LSB) for a set bit (1).
if (_BitScanReverse64(&leading_zero, input_num))
return (int)(63 - leading_zero);
else
return 64;
#else
return __builtin_clzll(input_num);
#endif // SIMDJSON_REGULAR_VISUAL_STUDIO
}
#if SIMDJSON_REGULAR_VISUAL_STUDIO
simdjson_inline int count_ones(uint64_t input_num) {
// note: we do not support legacy 32-bit Windows in this kernel
return __popcnt64(input_num); // Visual Studio wants two underscores
}
#else
simdjson_inline int count_ones(uint64_t input_num) {
return __builtin_popcountll(input_num);
}
#endif
simdjson_inline bool add_overflow(uint64_t value1, uint64_t value2,
uint64_t *result) {
#if SIMDJSON_REGULAR_VISUAL_STUDIO
*result = value1 + value2;
return *result < value1;
#else
return __builtin_uaddll_overflow(value1, value2,
reinterpret_cast<unsigned long long *>(result));
#endif
}
} // unnamed namespace
} // namespace ppc64
} // namespace simdjson
#endif // SIMDJSON_PPC64_BITMANIPULATION_H
/* end file simdjson/ppc64/bitmanipulation.h */
/* including simdjson/ppc64/bitmask.h: #include "simdjson/ppc64/bitmask.h" */
/* begin file simdjson/ppc64/bitmask.h */
#ifndef SIMDJSON_PPC64_BITMASK_H
#define SIMDJSON_PPC64_BITMASK_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/ppc64/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace ppc64 {
namespace {
//
// Perform a "cumulative bitwise xor," flipping bits each time a 1 is
// encountered.
//
// For example, prefix_xor(00100100) == 00011100
//
simdjson_inline uint64_t prefix_xor(uint64_t bitmask) {
// You can use the version below, however gcc sometimes miscompiles
// vec_pmsum_be, it happens somewhere around between 8 and 9th version.
// The performance boost was not noticeable, falling back to a usual
// implementation.
// __vector unsigned long long all_ones = {~0ull, ~0ull};
// __vector unsigned long long mask = {bitmask, 0};
// // Clang and GCC return different values for pmsum for ull so cast it to one.
// // Generally it is not specified by ALTIVEC ISA what is returned by
// // vec_pmsum_be.
// #if defined(__LITTLE_ENDIAN__)
// return (uint64_t)(((__vector unsigned long long)vec_pmsum_be(all_ones, mask))[0]);
// #else
// return (uint64_t)(((__vector unsigned long long)vec_pmsum_be(all_ones, mask))[1]);
// #endif
bitmask ^= bitmask << 1;
bitmask ^= bitmask << 2;
bitmask ^= bitmask << 4;
bitmask ^= bitmask << 8;
bitmask ^= bitmask << 16;
bitmask ^= bitmask << 32;
return bitmask;
}
} // unnamed namespace
} // namespace ppc64
} // namespace simdjson
#endif
/* end file simdjson/ppc64/bitmask.h */
/* including simdjson/ppc64/numberparsing_defs.h: #include "simdjson/ppc64/numberparsing_defs.h" */
/* begin file simdjson/ppc64/numberparsing_defs.h */
#ifndef SIMDJSON_PPC64_NUMBERPARSING_DEFS_H
#define SIMDJSON_PPC64_NUMBERPARSING_DEFS_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/ppc64/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/ppc64/intrinsics.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/numberparsing_tables.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#include <cstring>
#if defined(__linux__)
#include <byteswap.h>
#elif defined(__FreeBSD__)
#include <sys/endian.h>
#endif
namespace simdjson {
namespace ppc64 {
namespace numberparsing {
// we don't have appropriate instructions, so let us use a scalar function
// credit: https://johnnylee-sde.github.io/Fast-numeric-string-to-int/
/** @private */
static simdjson_inline uint32_t parse_eight_digits_unrolled(const uint8_t *chars) {
uint64_t val;
std::memcpy(&val, chars, sizeof(uint64_t));
#ifdef __BIG_ENDIAN__
#if defined(__linux__)
val = bswap_64(val);
#elif defined(__FreeBSD__)
val = bswap64(val);
#endif
#endif
val = (val & 0x0F0F0F0F0F0F0F0F) * 2561 >> 8;
val = (val & 0x00FF00FF00FF00FF) * 6553601 >> 16;
return uint32_t((val & 0x0000FFFF0000FFFF) * 42949672960001 >> 32);
}
/** @private */
simdjson_inline internal::value128 full_multiplication(uint64_t value1, uint64_t value2) {
internal::value128 answer;
#if SIMDJSON_REGULAR_VISUAL_STUDIO || SIMDJSON_IS_32BITS
#ifdef _M_ARM64
// ARM64 has native support for 64-bit multiplications, no need to emultate
answer.high = __umulh(value1, value2);
answer.low = value1 * value2;
#else
answer.low = _umul128(value1, value2, &answer.high); // _umul128 not available on ARM64
#endif // _M_ARM64
#else // SIMDJSON_REGULAR_VISUAL_STUDIO || SIMDJSON_IS_32BITS
__uint128_t r = (static_cast<__uint128_t>(value1)) * value2;
answer.low = uint64_t(r);
answer.high = uint64_t(r >> 64);
#endif
return answer;
}
} // namespace numberparsing
} // namespace ppc64
} // namespace simdjson
#define SIMDJSON_SWAR_NUMBER_PARSING 1
#endif // SIMDJSON_PPC64_NUMBERPARSING_DEFS_H
/* end file simdjson/ppc64/numberparsing_defs.h */
/* including simdjson/ppc64/simd.h: #include "simdjson/ppc64/simd.h" */
/* begin file simdjson/ppc64/simd.h */
#ifndef SIMDJSON_PPC64_SIMD_H
#define SIMDJSON_PPC64_SIMD_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/ppc64/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/ppc64/bitmanipulation.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/simdprune_tables.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#include <type_traits>
namespace simdjson {
namespace ppc64 {
namespace {
namespace simd {
using __m128i = __vector unsigned char;
template <typename Child> struct base {
__m128i value;
// Zero constructor
simdjson_inline base() : value{__m128i()} {}
// Conversion from SIMD register
simdjson_inline base(const __m128i _value) : value(_value) {}
// Conversion to SIMD register
simdjson_inline operator const __m128i &() const {
return this->value;
}
simdjson_inline operator __m128i &() { return this->value; }
// Bit operations
simdjson_inline Child operator|(const Child other) const {
return vec_or(this->value, (__m128i)other);
}
simdjson_inline Child operator&(const Child other) const {
return vec_and(this->value, (__m128i)other);
}
simdjson_inline Child operator^(const Child other) const {
return vec_xor(this->value, (__m128i)other);
}
simdjson_inline Child bit_andnot(const Child other) const {
return vec_andc(this->value, (__m128i)other);
}
simdjson_inline Child &operator|=(const Child other) {
auto this_cast = static_cast<Child*>(this);
*this_cast = *this_cast | other;
return *this_cast;
}
simdjson_inline Child &operator&=(const Child other) {
auto this_cast = static_cast<Child*>(this);
*this_cast = *this_cast & other;
return *this_cast;
}
simdjson_inline Child &operator^=(const Child other) {
auto this_cast = static_cast<Child*>(this);
*this_cast = *this_cast ^ other;
return *this_cast;
}
};
template <typename T, typename Mask = simd8<bool>>
struct base8 : base<simd8<T>> {
typedef uint16_t bitmask_t;
typedef uint32_t bitmask2_t;
simdjson_inline base8() : base<simd8<T>>() {}
simdjson_inline base8(const __m128i _value) : base<simd8<T>>(_value) {}
friend simdjson_inline Mask operator==(const simd8<T> lhs, const simd8<T> rhs) {
return (__m128i)vec_cmpeq(lhs.value, (__m128i)rhs);
}
static const int SIZE = sizeof(base<simd8<T>>::value);
template <int N = 1>
simdjson_inline simd8<T> prev(simd8<T> prev_chunk) const {
__m128i chunk = this->value;
#ifdef __LITTLE_ENDIAN__
chunk = (__m128i)vec_reve(this->value);
prev_chunk = (__m128i)vec_reve((__m128i)prev_chunk);
#endif
chunk = (__m128i)vec_sld((__m128i)prev_chunk, (__m128i)chunk, 16 - N);
#ifdef __LITTLE_ENDIAN__
chunk = (__m128i)vec_reve((__m128i)chunk);
#endif
return chunk;
}
};
// SIMD byte mask type (returned by things like eq and gt)
template <> struct simd8<bool> : base8<bool> {
static simdjson_inline simd8<bool> splat(bool _value) {
return (__m128i)vec_splats((unsigned char)(-(!!_value)));
}
simdjson_inline simd8<bool>() : base8<bool>() {}
simdjson_inline simd8<bool>(const __m128i _value)
: base8<bool>(_value) {}
// Splat constructor
simdjson_inline simd8<bool>(bool _value)
: base8<bool>(splat(_value)) {}
simdjson_inline int to_bitmask() const {
__vector unsigned long long result;
const __m128i perm_mask = {0x78, 0x70, 0x68, 0x60, 0x58, 0x50, 0x48, 0x40,
0x38, 0x30, 0x28, 0x20, 0x18, 0x10, 0x08, 0x00};
result = ((__vector unsigned long long)vec_vbpermq((__m128i)this->value,
(__m128i)perm_mask));
#ifdef __LITTLE_ENDIAN__
return static_cast<int>(result[1]);
#else
return static_cast<int>(result[0]);
#endif
}
simdjson_inline bool any() const {
return !vec_all_eq(this->value, (__m128i)vec_splats(0));
}
simdjson_inline simd8<bool> operator~() const {
return this->value ^ (__m128i)splat(true);
}
};
template <typename T> struct base8_numeric : base8<T> {
static simdjson_inline simd8<T> splat(T value) {
(void)value;
return (__m128i)vec_splats(value);
}
static simdjson_inline simd8<T> zero() { return splat(0); }
static simdjson_inline simd8<T> load(const T values[16]) {
return (__m128i)(vec_vsx_ld(0, reinterpret_cast<const uint8_t *>(values)));
}
// Repeat 16 values as many times as necessary (usually for lookup tables)
static simdjson_inline simd8<T> repeat_16(T v0, T v1, T v2, T v3, T v4,
T v5, T v6, T v7, T v8, T v9,
T v10, T v11, T v12, T v13,
T v14, T v15) {
return simd8<T>(v0, v1, v2, v3, v4, v5, v6, v7, v8, v9, v10, v11, v12, v13,
v14, v15);
}
simdjson_inline base8_numeric() : base8<T>() {}
simdjson_inline base8_numeric(const __m128i _value)
: base8<T>(_value) {}
// Store to array
simdjson_inline void store(T dst[16]) const {
vec_vsx_st(this->value, 0, reinterpret_cast<__m128i *>(dst));
}
// Override to distinguish from bool version
simdjson_inline simd8<T> operator~() const { return *this ^ 0xFFu; }
// Addition/subtraction are the same for signed and unsigned
simdjson_inline simd8<T> operator+(const simd8<T> other) const {
return (__m128i)((__m128i)this->value + (__m128i)other);
}
simdjson_inline simd8<T> operator-(const simd8<T> other) const {
return (__m128i)((__m128i)this->value - (__m128i)other);
}
simdjson_inline simd8<T> &operator+=(const simd8<T> other) {
*this = *this + other;
return *static_cast<simd8<T> *>(this);
}
simdjson_inline simd8<T> &operator-=(const simd8<T> other) {
*this = *this - other;
return *static_cast<simd8<T> *>(this);
}
// Perform a lookup assuming the value is between 0 and 16 (undefined behavior
// for out of range values)
template <typename L>
simdjson_inline simd8<L> lookup_16(simd8<L> lookup_table) const {
return (__m128i)vec_perm((__m128i)lookup_table, (__m128i)lookup_table, this->value);
}
// Copies to 'output" all bytes corresponding to a 0 in the mask (interpreted
// as a bitset). Passing a 0 value for mask would be equivalent to writing out
// every byte to output. Only the first 16 - count_ones(mask) bytes of the
// result are significant but 16 bytes get written. Design consideration: it
// seems like a function with the signature simd8<L> compress(uint32_t mask)
// would be sensible, but the AVX ISA makes this kind of approach difficult.
template <typename L>
simdjson_inline void compress(uint16_t mask, L *output) const {
using internal::BitsSetTable256mul2;
using internal::pshufb_combine_table;
using internal::thintable_epi8;
// this particular implementation was inspired by work done by @animetosho
// we do it in two steps, first 8 bytes and then second 8 bytes
uint8_t mask1 = uint8_t(mask); // least significant 8 bits
uint8_t mask2 = uint8_t(mask >> 8); // most significant 8 bits
// next line just loads the 64-bit values thintable_epi8[mask1] and
// thintable_epi8[mask2] into a 128-bit register, using only
// two instructions on most compilers.
#ifdef __LITTLE_ENDIAN__
__m128i shufmask = (__m128i)(__vector unsigned long long){
thintable_epi8[mask1], thintable_epi8[mask2]};
#else
__m128i shufmask = (__m128i)(__vector unsigned long long){
thintable_epi8[mask2], thintable_epi8[mask1]};
shufmask = (__m128i)vec_reve((__m128i)shufmask);
#endif
// we increment by 0x08 the second half of the mask
shufmask = ((__m128i)shufmask) +
((__m128i)(__vector int){0, 0, 0x08080808, 0x08080808});
// this is the version "nearly pruned"
__m128i pruned = vec_perm(this->value, this->value, shufmask);
// we still need to put the two halves together.
// we compute the popcount of the first half:
int pop1 = BitsSetTable256mul2[mask1];
// then load the corresponding mask, what it does is to write
// only the first pop1 bytes from the first 8 bytes, and then
// it fills in with the bytes from the second 8 bytes + some filling
// at the end.
__m128i compactmask =
vec_vsx_ld(0, reinterpret_cast<const uint8_t *>(pshufb_combine_table + pop1 * 8));
__m128i answer = vec_perm(pruned, (__m128i)vec_splats(0), compactmask);
vec_vsx_st(answer, 0, reinterpret_cast<__m128i *>(output));
}
template <typename L>
simdjson_inline simd8<L>
lookup_16(L replace0, L replace1, L replace2, L replace3, L replace4,
L replace5, L replace6, L replace7, L replace8, L replace9,
L replace10, L replace11, L replace12, L replace13, L replace14,
L replace15) const {
return lookup_16(simd8<L>::repeat_16(
replace0, replace1, replace2, replace3, replace4, replace5, replace6,
replace7, replace8, replace9, replace10, replace11, replace12,
replace13, replace14, replace15));
}
};
// Signed bytes
template <> struct simd8<int8_t> : base8_numeric<int8_t> {
simdjson_inline simd8() : base8_numeric<int8_t>() {}
simdjson_inline simd8(const __m128i _value)
: base8_numeric<int8_t>(_value) {}
// Splat constructor
simdjson_inline simd8(int8_t _value) : simd8(splat(_value)) {}
// Array constructor
simdjson_inline simd8(const int8_t *values) : simd8(load(values)) {}
// Member-by-member initialization
simdjson_inline simd8(int8_t v0, int8_t v1, int8_t v2, int8_t v3,
int8_t v4, int8_t v5, int8_t v6, int8_t v7,
int8_t v8, int8_t v9, int8_t v10, int8_t v11,
int8_t v12, int8_t v13, int8_t v14, int8_t v15)
: simd8((__m128i)(__vector signed char){v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10, v11, v12, v13, v14,
v15}) {}
// Repeat 16 values as many times as necessary (usually for lookup tables)
simdjson_inline static simd8<int8_t>
repeat_16(int8_t v0, int8_t v1, int8_t v2, int8_t v3, int8_t v4, int8_t v5,
int8_t v6, int8_t v7, int8_t v8, int8_t v9, int8_t v10, int8_t v11,
int8_t v12, int8_t v13, int8_t v14, int8_t v15) {
return simd8<int8_t>(v0, v1, v2, v3, v4, v5, v6, v7, v8, v9, v10, v11, v12,
v13, v14, v15);
}
// Order-sensitive comparisons
simdjson_inline simd8<int8_t>
max_val(const simd8<int8_t> other) const {
return (__m128i)vec_max((__vector signed char)this->value,
(__vector signed char)(__m128i)other);
}
simdjson_inline simd8<int8_t>
min_val(const simd8<int8_t> other) const {
return (__m128i)vec_min((__vector signed char)this->value,
(__vector signed char)(__m128i)other);
}
simdjson_inline simd8<bool>
operator>(const simd8<int8_t> other) const {
return (__m128i)vec_cmpgt((__vector signed char)this->value,
(__vector signed char)(__m128i)other);
}
simdjson_inline simd8<bool>
operator<(const simd8<int8_t> other) const {
return (__m128i)vec_cmplt((__vector signed char)this->value,
(__vector signed char)(__m128i)other);
}
};
// Unsigned bytes
template <> struct simd8<uint8_t> : base8_numeric<uint8_t> {
simdjson_inline simd8() : base8_numeric<uint8_t>() {}
simdjson_inline simd8(const __m128i _value)
: base8_numeric<uint8_t>(_value) {}
// Splat constructor
simdjson_inline simd8(uint8_t _value) : simd8(splat(_value)) {}
// Array constructor
simdjson_inline simd8(const uint8_t *values) : simd8(load(values)) {}
// Member-by-member initialization
simdjson_inline
simd8(uint8_t v0, uint8_t v1, uint8_t v2, uint8_t v3, uint8_t v4, uint8_t v5,
uint8_t v6, uint8_t v7, uint8_t v8, uint8_t v9, uint8_t v10,
uint8_t v11, uint8_t v12, uint8_t v13, uint8_t v14, uint8_t v15)
: simd8((__m128i){v0, v1, v2, v3, v4, v5, v6, v7, v8, v9, v10, v11, v12,
v13, v14, v15}) {}
// Repeat 16 values as many times as necessary (usually for lookup tables)
simdjson_inline static simd8<uint8_t>
repeat_16(uint8_t v0, uint8_t v1, uint8_t v2, uint8_t v3, uint8_t v4,
uint8_t v5, uint8_t v6, uint8_t v7, uint8_t v8, uint8_t v9,
uint8_t v10, uint8_t v11, uint8_t v12, uint8_t v13, uint8_t v14,
uint8_t v15) {
return simd8<uint8_t>(v0, v1, v2, v3, v4, v5, v6, v7, v8, v9, v10, v11, v12,
v13, v14, v15);
}
// Saturated math
simdjson_inline simd8<uint8_t>
saturating_add(const simd8<uint8_t> other) const {
return (__m128i)vec_adds(this->value, (__m128i)other);
}
simdjson_inline simd8<uint8_t>
saturating_sub(const simd8<uint8_t> other) const {
return (__m128i)vec_subs(this->value, (__m128i)other);
}
// Order-specific operations
simdjson_inline simd8<uint8_t>
max_val(const simd8<uint8_t> other) const {
return (__m128i)vec_max(this->value, (__m128i)other);
}
simdjson_inline simd8<uint8_t>
min_val(const simd8<uint8_t> other) const {
return (__m128i)vec_min(this->value, (__m128i)other);
}
// Same as >, but only guarantees true is nonzero (< guarantees true = -1)
simdjson_inline simd8<uint8_t>
gt_bits(const simd8<uint8_t> other) const {
return this->saturating_sub(other);
}
// Same as <, but only guarantees true is nonzero (< guarantees true = -1)
simdjson_inline simd8<uint8_t>
lt_bits(const simd8<uint8_t> other) const {
return other.saturating_sub(*this);
}
simdjson_inline simd8<bool>
operator<=(const simd8<uint8_t> other) const {
return other.max_val(*this) == other;
}
simdjson_inline simd8<bool>
operator>=(const simd8<uint8_t> other) const {
return other.min_val(*this) == other;
}
simdjson_inline simd8<bool>
operator>(const simd8<uint8_t> other) const {
return this->gt_bits(other).any_bits_set();
}
simdjson_inline simd8<bool>
operator<(const simd8<uint8_t> other) const {
return this->gt_bits(other).any_bits_set();
}
// Bit-specific operations
simdjson_inline simd8<bool> bits_not_set() const {
return (__m128i)vec_cmpeq(this->value, (__m128i)vec_splats(uint8_t(0)));
}
simdjson_inline simd8<bool> bits_not_set(simd8<uint8_t> bits) const {
return (*this & bits).bits_not_set();
}
simdjson_inline simd8<bool> any_bits_set() const {
return ~this->bits_not_set();
}
simdjson_inline simd8<bool> any_bits_set(simd8<uint8_t> bits) const {
return ~this->bits_not_set(bits);
}
simdjson_inline bool bits_not_set_anywhere() const {
return vec_all_eq(this->value, (__m128i)vec_splats(0));
}
simdjson_inline bool any_bits_set_anywhere() const {
return !bits_not_set_anywhere();
}
simdjson_inline bool bits_not_set_anywhere(simd8<uint8_t> bits) const {
return vec_all_eq(vec_and(this->value, (__m128i)bits),
(__m128i)vec_splats(0));
}
simdjson_inline bool any_bits_set_anywhere(simd8<uint8_t> bits) const {
return !bits_not_set_anywhere(bits);
}
template <int N> simdjson_inline simd8<uint8_t> shr() const {
return simd8<uint8_t>(
(__m128i)vec_sr(this->value, (__m128i)vec_splat_u8(N)));
}
template <int N> simdjson_inline simd8<uint8_t> shl() const {
return simd8<uint8_t>(
(__m128i)vec_sl(this->value, (__m128i)vec_splat_u8(N)));
}
};
template <typename T> struct simd8x64 {
static constexpr int NUM_CHUNKS = 64 / sizeof(simd8<T>);
static_assert(NUM_CHUNKS == 4,
"PPC64 kernel should use four registers per 64-byte block.");
const simd8<T> chunks[NUM_CHUNKS];
simd8x64(const simd8x64<T> &o) = delete; // no copy allowed
simd8x64<T> &
operator=(const simd8<T>& other) = delete; // no assignment allowed
simd8x64() = delete; // no default constructor allowed
simdjson_inline simd8x64(const simd8<T> chunk0, const simd8<T> chunk1,
const simd8<T> chunk2, const simd8<T> chunk3)
: chunks{chunk0, chunk1, chunk2, chunk3} {}
simdjson_inline simd8x64(const T ptr[64])
: chunks{simd8<T>::load(ptr), simd8<T>::load(ptr + 16),
simd8<T>::load(ptr + 32), simd8<T>::load(ptr + 48)} {}
simdjson_inline void store(T ptr[64]) const {
this->chunks[0].store(ptr + sizeof(simd8<T>) * 0);
this->chunks[1].store(ptr + sizeof(simd8<T>) * 1);
this->chunks[2].store(ptr + sizeof(simd8<T>) * 2);
this->chunks[3].store(ptr + sizeof(simd8<T>) * 3);
}
simdjson_inline simd8<T> reduce_or() const {
return (this->chunks[0] | this->chunks[1]) |
(this->chunks[2] | this->chunks[3]);
}
simdjson_inline uint64_t compress(uint64_t mask, T *output) const {
this->chunks[0].compress(uint16_t(mask), output);
this->chunks[1].compress(uint16_t(mask >> 16),
output + 16 - count_ones(mask & 0xFFFF));
this->chunks[2].compress(uint16_t(mask >> 32),
output + 32 - count_ones(mask & 0xFFFFFFFF));
this->chunks[3].compress(uint16_t(mask >> 48),
output + 48 - count_ones(mask & 0xFFFFFFFFFFFF));
return 64 - count_ones(mask);
}
simdjson_inline uint64_t to_bitmask() const {
uint64_t r0 = uint32_t(this->chunks[0].to_bitmask());
uint64_t r1 = this->chunks[1].to_bitmask();
uint64_t r2 = this->chunks[2].to_bitmask();
uint64_t r3 = this->chunks[3].to_bitmask();
return r0 | (r1 << 16) | (r2 << 32) | (r3 << 48);
}
simdjson_inline uint64_t eq(const T m) const {
const simd8<T> mask = simd8<T>::splat(m);
return simd8x64<bool>(this->chunks[0] == mask, this->chunks[1] == mask,
this->chunks[2] == mask, this->chunks[3] == mask)
.to_bitmask();
}
simdjson_inline uint64_t eq(const simd8x64<uint8_t> &other) const {
return simd8x64<bool>(this->chunks[0] == other.chunks[0],
this->chunks[1] == other.chunks[1],
this->chunks[2] == other.chunks[2],
this->chunks[3] == other.chunks[3])
.to_bitmask();
}
simdjson_inline uint64_t lteq(const T m) const {
const simd8<T> mask = simd8<T>::splat(m);
return simd8x64<bool>(this->chunks[0] <= mask, this->chunks[1] <= mask,
this->chunks[2] <= mask, this->chunks[3] <= mask)
.to_bitmask();
}
}; // struct simd8x64<T>
} // namespace simd
} // unnamed namespace
} // namespace ppc64
} // namespace simdjson
#endif // SIMDJSON_PPC64_SIMD_INPUT_H
/* end file simdjson/ppc64/simd.h */
/* including simdjson/ppc64/stringparsing_defs.h: #include "simdjson/ppc64/stringparsing_defs.h" */
/* begin file simdjson/ppc64/stringparsing_defs.h */
#ifndef SIMDJSON_PPC64_STRINGPARSING_DEFS_H
#define SIMDJSON_PPC64_STRINGPARSING_DEFS_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/ppc64/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/ppc64/bitmanipulation.h" */
/* amalgamation skipped (editor-only): #include "simdjson/ppc64/simd.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace ppc64 {
namespace {
using namespace simd;
// Holds backslashes and quotes locations.
struct backslash_and_quote {
public:
static constexpr uint32_t BYTES_PROCESSED = 32;
simdjson_inline static backslash_and_quote
copy_and_find(const uint8_t *src, uint8_t *dst);
simdjson_inline bool has_quote_first() {
return ((bs_bits - 1) & quote_bits) != 0;
}
simdjson_inline bool has_backslash() { return bs_bits != 0; }
simdjson_inline int quote_index() {
return trailing_zeroes(quote_bits);
}
simdjson_inline int backslash_index() {
return trailing_zeroes(bs_bits);
}
uint32_t bs_bits;
uint32_t quote_bits;
}; // struct backslash_and_quote
simdjson_inline backslash_and_quote
backslash_and_quote::copy_and_find(const uint8_t *src, uint8_t *dst) {
// this can read up to 31 bytes beyond the buffer size, but we require
// SIMDJSON_PADDING of padding
static_assert(SIMDJSON_PADDING >= (BYTES_PROCESSED - 1),
"backslash and quote finder must process fewer than "
"SIMDJSON_PADDING bytes");
simd8<uint8_t> v0(src);
simd8<uint8_t> v1(src + sizeof(v0));
v0.store(dst);
v1.store(dst + sizeof(v0));
// Getting a 64-bit bitmask is much cheaper than multiple 16-bit bitmasks on
// PPC; therefore, we smash them together into a 64-byte mask and get the
// bitmask from there.
uint64_t bs_and_quote =
simd8x64<bool>(v0 == '\\', v1 == '\\', v0 == '"', v1 == '"').to_bitmask();
return {
uint32_t(bs_and_quote), // bs_bits
uint32_t(bs_and_quote >> 32) // quote_bits
};
}
} // unnamed namespace
} // namespace ppc64
} // namespace simdjson
#endif // SIMDJSON_PPC64_STRINGPARSING_DEFS_H
/* end file simdjson/ppc64/stringparsing_defs.h */
#define SIMDJSON_SKIP_BACKSLASH_SHORT_CIRCUIT 1
/* end file simdjson/ppc64/begin.h */
/* including generic/amalgamated.h for ppc64: #include <generic/amalgamated.h> */
/* begin file generic/amalgamated.h for ppc64 */
#if defined(SIMDJSON_CONDITIONAL_INCLUDE) && !defined(SIMDJSON_SRC_GENERIC_DEPENDENCIES_H)
#error generic/dependencies.h must be included before generic/amalgamated.h!
#endif
/* including generic/base.h for ppc64: #include <generic/base.h> */
/* begin file generic/base.h for ppc64 */
#ifndef SIMDJSON_SRC_GENERIC_BASE_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_BASE_H */
/* amalgamation skipped (editor-only): #include <base.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/base.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace ppc64 {
namespace {
struct json_character_block;
} // unnamed namespace
} // namespace ppc64
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_BASE_H
/* end file generic/base.h for ppc64 */
/* including generic/dom_parser_implementation.h for ppc64: #include <generic/dom_parser_implementation.h> */
/* begin file generic/dom_parser_implementation.h for ppc64 */
#ifndef SIMDJSON_SRC_GENERIC_DOM_PARSER_IMPLEMENTATION_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_DOM_PARSER_IMPLEMENTATION_H */
/* amalgamation skipped (editor-only): #include <generic/base.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/dom_parser_implementation.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
// Interface a dom parser implementation must fulfill
namespace simdjson {
namespace ppc64 {
namespace {
simdjson_inline simd8<uint8_t> must_be_2_3_continuation(const simd8<uint8_t> prev2, const simd8<uint8_t> prev3);
simdjson_inline bool is_ascii(const simd8x64<uint8_t>& input);
} // unnamed namespace
} // namespace ppc64
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_DOM_PARSER_IMPLEMENTATION_H
/* end file generic/dom_parser_implementation.h for ppc64 */
/* including generic/json_character_block.h for ppc64: #include <generic/json_character_block.h> */
/* begin file generic/json_character_block.h for ppc64 */
#ifndef SIMDJSON_SRC_GENERIC_JSON_CHARACTER_BLOCK_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_JSON_CHARACTER_BLOCK_H */
/* amalgamation skipped (editor-only): #include <generic/base.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace ppc64 {
namespace {
struct json_character_block {
static simdjson_inline json_character_block classify(const simd::simd8x64<uint8_t>& in);
simdjson_inline uint64_t whitespace() const noexcept { return _whitespace; }
simdjson_inline uint64_t op() const noexcept { return _op; }
simdjson_inline uint64_t scalar() const noexcept { return ~(op() | whitespace()); }
uint64_t _whitespace;
uint64_t _op;
};
} // unnamed namespace
} // namespace ppc64
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_JSON_CHARACTER_BLOCK_H
/* end file generic/json_character_block.h for ppc64 */
/* end file generic/amalgamated.h for ppc64 */
/* including generic/stage1/amalgamated.h for ppc64: #include <generic/stage1/amalgamated.h> */
/* begin file generic/stage1/amalgamated.h for ppc64 */
// Stuff other things depend on
/* including generic/stage1/base.h for ppc64: #include <generic/stage1/base.h> */
/* begin file generic/stage1/base.h for ppc64 */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_BASE_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_BASE_H */
/* amalgamation skipped (editor-only): #include <generic/base.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace ppc64 {
namespace {
namespace stage1 {
class bit_indexer;
template<size_t STEP_SIZE>
struct buf_block_reader;
struct json_block;
class json_minifier;
class json_scanner;
struct json_string_block;
class json_string_scanner;
class json_structural_indexer;
} // namespace stage1
namespace utf8_validation {
struct utf8_checker;
} // namespace utf8_validation
using utf8_validation::utf8_checker;
} // unnamed namespace
} // namespace ppc64
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE1_BASE_H
/* end file generic/stage1/base.h for ppc64 */
/* including generic/stage1/buf_block_reader.h for ppc64: #include <generic/stage1/buf_block_reader.h> */
/* begin file generic/stage1/buf_block_reader.h for ppc64 */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_BUF_BLOCK_READER_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_BUF_BLOCK_READER_H */
/* amalgamation skipped (editor-only): #include <generic/stage1/base.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#include <cstring>
namespace simdjson {
namespace ppc64 {
namespace {
namespace stage1 {
// Walks through a buffer in block-sized increments, loading the last part with spaces
template<size_t STEP_SIZE>
struct buf_block_reader {
public:
simdjson_inline buf_block_reader(const uint8_t *_buf, size_t _len);
simdjson_inline size_t block_index();
simdjson_inline bool has_full_block() const;
simdjson_inline const uint8_t *full_block() const;
/**
* Get the last block, padded with spaces.
*
* There will always be a last block, with at least 1 byte, unless len == 0 (in which case this
* function fills the buffer with spaces and returns 0. In particular, if len == STEP_SIZE there
* will be 0 full_blocks and 1 remainder block with STEP_SIZE bytes and no spaces for padding.
*
* @return the number of effective characters in the last block.
*/
simdjson_inline size_t get_remainder(uint8_t *dst) const;
simdjson_inline void advance();
private:
const uint8_t *buf;
const size_t len;
const size_t lenminusstep;
size_t idx;
};
// Routines to print masks and text for debugging bitmask operations
simdjson_unused static char * format_input_text_64(const uint8_t *text) {
static char buf[sizeof(simd8x64<uint8_t>) + 1];
for (size_t i=0; i<sizeof(simd8x64<uint8_t>); i++) {
buf[i] = int8_t(text[i]) < ' ' ? '_' : int8_t(text[i]);
}
buf[sizeof(simd8x64<uint8_t>)] = '\0';
return buf;
}
// Routines to print masks and text for debugging bitmask operations
simdjson_unused static char * format_input_text(const simd8x64<uint8_t>& in) {
static char buf[sizeof(simd8x64<uint8_t>) + 1];
in.store(reinterpret_cast<uint8_t*>(buf));
for (size_t i=0; i<sizeof(simd8x64<uint8_t>); i++) {
if (buf[i] < ' ') { buf[i] = '_'; }
}
buf[sizeof(simd8x64<uint8_t>)] = '\0';
return buf;
}
simdjson_unused static char * format_input_text(const simd8x64<uint8_t>& in, uint64_t mask) {
static char buf[sizeof(simd8x64<uint8_t>) + 1];
in.store(reinterpret_cast<uint8_t*>(buf));
for (size_t i=0; i<sizeof(simd8x64<uint8_t>); i++) {
if (buf[i] <= ' ') { buf[i] = '_'; }
if (!(mask & (size_t(1) << i))) { buf[i] = ' '; }
}
buf[sizeof(simd8x64<uint8_t>)] = '\0';
return buf;
}
simdjson_unused static char * format_mask(uint64_t mask) {
static char buf[sizeof(simd8x64<uint8_t>) + 1];
for (size_t i=0; i<64; i++) {
buf[i] = (mask & (size_t(1) << i)) ? 'X' : ' ';
}
buf[64] = '\0';
return buf;
}
template<size_t STEP_SIZE>
simdjson_inline buf_block_reader<STEP_SIZE>::buf_block_reader(const uint8_t *_buf, size_t _len) : buf{_buf}, len{_len}, lenminusstep{len < STEP_SIZE ? 0 : len - STEP_SIZE}, idx{0} {}
template<size_t STEP_SIZE>
simdjson_inline size_t buf_block_reader<STEP_SIZE>::block_index() { return idx; }
template<size_t STEP_SIZE>
simdjson_inline bool buf_block_reader<STEP_SIZE>::has_full_block() const {
return idx < lenminusstep;
}
template<size_t STEP_SIZE>
simdjson_inline const uint8_t *buf_block_reader<STEP_SIZE>::full_block() const {
return &buf[idx];
}
template<size_t STEP_SIZE>
simdjson_inline size_t buf_block_reader<STEP_SIZE>::get_remainder(uint8_t *dst) const {
if(len == idx) { return 0; } // memcpy(dst, null, 0) will trigger an error with some sanitizers
std::memset(dst, 0x20, STEP_SIZE); // std::memset STEP_SIZE because it's more efficient to write out 8 or 16 bytes at once.
std::memcpy(dst, buf + idx, len - idx);
return len - idx;
}
template<size_t STEP_SIZE>
simdjson_inline void buf_block_reader<STEP_SIZE>::advance() {
idx += STEP_SIZE;
}
} // namespace stage1
} // unnamed namespace
} // namespace ppc64
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE1_BUF_BLOCK_READER_H
/* end file generic/stage1/buf_block_reader.h for ppc64 */
/* including generic/stage1/json_escape_scanner.h for ppc64: #include <generic/stage1/json_escape_scanner.h> */
/* begin file generic/stage1/json_escape_scanner.h for ppc64 */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_JSON_ESCAPE_SCANNER_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_JSON_ESCAPE_SCANNER_H */
/* amalgamation skipped (editor-only): #include <generic/stage1/base.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/buf_block_reader.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace ppc64 {
namespace {
namespace stage1 {
/**
* Scans for escape characters in JSON, taking care with multiple backslashes (\\n vs. \n).
*/
struct json_escape_scanner {
/** The actual escape characters (the backslashes themselves). */
uint64_t next_is_escaped = 0ULL;
struct escaped_and_escape {
/**
* Mask of escaped characters.
*
* ```
* \n \\n \\\n \\\\n \
* 0100100010100101000
* n \ \ n \ \
* ```
*/
uint64_t escaped;
/**
* Mask of escape characters.
*
* ```
* \n \\n \\\n \\\\n \
* 1001000101001010001
* \ \ \ \ \ \ \
* ```
*/
uint64_t escape;
};
/**
* Get a mask of both escape and escaped characters (the characters following a backslash).
*
* @param potential_escape A mask of the character that can escape others (but could be
* escaped itself). e.g. block.eq('\\')
*/
simdjson_really_inline escaped_and_escape next(uint64_t backslash) noexcept {
#if !SIMDJSON_SKIP_BACKSLASH_SHORT_CIRCUIT
if (!backslash) { return {next_escaped_without_backslashes(), 0}; }
#endif
// | | Mask (shows characters instead of 1's) | Depth | Instructions |
// |--------------------------------|----------------------------------------|-------|---------------------|
// | string | `\\n_\\\n___\\\n___\\\\___\\\\__\\\` | | |
// | | ` even odd even odd odd` | | |
// | potential_escape | ` \ \\\ \\\ \\\\ \\\\ \\\` | 1 | 1 (backslash & ~first_is_escaped)
// | escape_and_terminal_code | ` \n \ \n \ \n \ \ \ \ \ \` | 5 | 5 (next_escape_and_terminal_code())
// | escaped | `\ \ n \ n \ \ \ \ \ ` X | 6 | 7 (escape_and_terminal_code ^ (potential_escape | first_is_escaped))
// | escape | ` \ \ \ \ \ \ \ \ \ \` | 6 | 8 (escape_and_terminal_code & backslash)
// | first_is_escaped | `\ ` | 7 (*) | 9 (escape >> 63) ()
// (*) this is not needed until the next iteration
uint64_t escape_and_terminal_code = next_escape_and_terminal_code(backslash & ~this->next_is_escaped);
uint64_t escaped = escape_and_terminal_code ^ (backslash | this->next_is_escaped);
uint64_t escape = escape_and_terminal_code & backslash;
this->next_is_escaped = escape >> 63;
return {escaped, escape};
}
private:
static constexpr const uint64_t ODD_BITS = 0xAAAAAAAAAAAAAAAAULL;
simdjson_really_inline uint64_t next_escaped_without_backslashes() noexcept {
uint64_t escaped = this->next_is_escaped;
this->next_is_escaped = 0;
return escaped;
}
/**
* Returns a mask of the next escape characters (masking out escaped backslashes), along with
* any non-backslash escape codes.
*
* \n \\n \\\n \\\\n returns:
* \n \ \ \n \ \
* 11 100 1011 10100
*
* You are expected to mask out the first bit yourself if the previous block had a trailing
* escape.
*
* & the result with potential_escape to get just the escape characters.
* ^ the result with (potential_escape | first_is_escaped) to get escaped characters.
*/
static simdjson_really_inline uint64_t next_escape_and_terminal_code(uint64_t potential_escape) noexcept {
// If we were to just shift and mask out any odd bits, we'd actually get a *half* right answer:
// any even-aligned backslash runs would be correct! Odd-aligned backslash runs would be
// inverted (\\\ would be 010 instead of 101).
//
// ```
// string: | ____\\\\_\\\\_____ |
// maybe_escaped | ODD | \ \ \ \ |
// even-aligned ^^^ ^^^^ odd-aligned
// ```
//
// Taking that into account, our basic strategy is:
//
// 1. Use subtraction to produce a mask with 1's for even-aligned runs and 0's for
// odd-aligned runs.
// 2. XOR all odd bits, which masks out the odd bits in even-aligned runs, and brings IN the
// odd bits in odd-aligned runs.
// 3. & with backslash to clean up any stray bits.
// runs are set to 0, and then XORing with "odd":
//
// | | Mask (shows characters instead of 1's) | Instructions |
// |--------------------------------|----------------------------------------|---------------------|
// | string | `\\n_\\\n___\\\n___\\\\___\\\\__\\\` |
// | | ` even odd even odd odd` |
// | maybe_escaped | ` n \\n \\n \\\_ \\\_ \\` X | 1 (potential_escape << 1)
// | maybe_escaped_and_odd | ` \n_ \\n _ \\\n_ _ \\\__ _\\\_ \\\` | 1 (maybe_escaped | odd)
// | even_series_codes_and_odd | ` n_\\\ _ n_ _\\\\ _ _ ` | 1 (maybe_escaped_and_odd - potential_escape)
// | escape_and_terminal_code | ` \n \ \n \ \n \ \ \ \ \ \` | 1 (^ odd)
//
// Escaped characters are characters following an escape.
uint64_t maybe_escaped = potential_escape << 1;
// To distinguish odd from even escape sequences, therefore, we turn on any *starting*
// escapes that are on an odd byte. (We actually bring in all odd bits, for speed.)
// - Odd runs of backslashes are 0000, and the code at the end ("n" in \n or \\n) is 1.
// - Odd runs of backslashes are 1111, and the code at the end ("n" in \n or \\n) is 0.
// - All other odd bytes are 1, and even bytes are 0.
uint64_t maybe_escaped_and_odd_bits = maybe_escaped | ODD_BITS;
uint64_t even_series_codes_and_odd_bits = maybe_escaped_and_odd_bits - potential_escape;
// Now we flip all odd bytes back with xor. This:
// - Makes odd runs of backslashes go from 0000 to 1010
// - Makes even runs of backslashes go from 1111 to 1010
// - Sets actually-escaped codes to 1 (the n in \n and \\n: \n = 11, \\n = 100)
// - Resets all other bytes to 0
return even_series_codes_and_odd_bits ^ ODD_BITS;
}
};
} // namespace stage1
} // unnamed namespace
} // namespace ppc64
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE1_JSON_STRING_SCANNER_H
/* end file generic/stage1/json_escape_scanner.h for ppc64 */
/* including generic/stage1/json_string_scanner.h for ppc64: #include <generic/stage1/json_string_scanner.h> */
/* begin file generic/stage1/json_string_scanner.h for ppc64 */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_JSON_STRING_SCANNER_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_JSON_STRING_SCANNER_H */
/* amalgamation skipped (editor-only): #include <generic/stage1/base.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/json_escape_scanner.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace ppc64 {
namespace {
namespace stage1 {
struct json_string_block {
// We spell out the constructors in the hope of resolving inlining issues with Visual Studio 2017
simdjson_really_inline json_string_block(uint64_t escaped, uint64_t quote, uint64_t in_string) :
_escaped(escaped), _quote(quote), _in_string(in_string) {}
// Escaped characters (characters following an escape() character)
simdjson_really_inline uint64_t escaped() const { return _escaped; }
// Real (non-backslashed) quotes
simdjson_really_inline uint64_t quote() const { return _quote; }
// Only characters inside the string (not including the quotes)
simdjson_really_inline uint64_t string_content() const { return _in_string & ~_quote; }
// Return a mask of whether the given characters are inside a string (only works on non-quotes)
simdjson_really_inline uint64_t non_quote_inside_string(uint64_t mask) const { return mask & _in_string; }
// Return a mask of whether the given characters are inside a string (only works on non-quotes)
simdjson_really_inline uint64_t non_quote_outside_string(uint64_t mask) const { return mask & ~_in_string; }
// Tail of string (everything except the start quote)
simdjson_really_inline uint64_t string_tail() const { return _in_string ^ _quote; }
// escaped characters (backslashed--does not include the hex characters after \u)
uint64_t _escaped;
// real quotes (non-escaped ones)
uint64_t _quote;
// string characters (includes start quote but not end quote)
uint64_t _in_string;
};
// Scans blocks for string characters, storing the state necessary to do so
class json_string_scanner {
public:
simdjson_really_inline json_string_block next(const simd::simd8x64<uint8_t>& in);
// Returns either UNCLOSED_STRING or SUCCESS
simdjson_really_inline error_code finish();
private:
// Scans for escape characters
json_escape_scanner escape_scanner{};
// Whether the last iteration was still inside a string (all 1's = true, all 0's = false).
uint64_t prev_in_string = 0ULL;
};
//
// Return a mask of all string characters plus end quotes.
//
// prev_escaped is overflow saying whether the next character is escaped.
// prev_in_string is overflow saying whether we're still in a string.
//
// Backslash sequences outside of quotes will be detected in stage 2.
//
simdjson_really_inline json_string_block json_string_scanner::next(const simd::simd8x64<uint8_t>& in) {
const uint64_t backslash = in.eq('\\');
const uint64_t escaped = escape_scanner.next(backslash).escaped;
const uint64_t quote = in.eq('"') & ~escaped;
//
// prefix_xor flips on bits inside the string (and flips off the end quote).
//
// Then we xor with prev_in_string: if we were in a string already, its effect is flipped
// (characters inside strings are outside, and characters outside strings are inside).
//
const uint64_t in_string = prefix_xor(quote) ^ prev_in_string;
//
// Check if we're still in a string at the end of the box so the next block will know
//
prev_in_string = uint64_t(static_cast<int64_t>(in_string) >> 63);
// Use ^ to turn the beginning quote off, and the end quote on.
// We are returning a function-local object so either we get a move constructor
// or we get copy elision.
return json_string_block(escaped, quote, in_string);
}
simdjson_really_inline error_code json_string_scanner::finish() {
if (prev_in_string) {
return UNCLOSED_STRING;
}
return SUCCESS;
}
} // namespace stage1
} // unnamed namespace
} // namespace ppc64
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE1_JSON_STRING_SCANNER_H
/* end file generic/stage1/json_string_scanner.h for ppc64 */
/* including generic/stage1/utf8_lookup4_algorithm.h for ppc64: #include <generic/stage1/utf8_lookup4_algorithm.h> */
/* begin file generic/stage1/utf8_lookup4_algorithm.h for ppc64 */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_UTF8_LOOKUP4_ALGORITHM_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_UTF8_LOOKUP4_ALGORITHM_H */
/* amalgamation skipped (editor-only): #include <generic/stage1/base.h> */
/* amalgamation skipped (editor-only): #include <generic/dom_parser_implementation.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace ppc64 {
namespace {
namespace utf8_validation {
using namespace simd;
simdjson_inline simd8<uint8_t> check_special_cases(const simd8<uint8_t> input, const simd8<uint8_t> prev1) {
// Bit 0 = Too Short (lead byte/ASCII followed by lead byte/ASCII)
// Bit 1 = Too Long (ASCII followed by continuation)
// Bit 2 = Overlong 3-byte
// Bit 4 = Surrogate
// Bit 5 = Overlong 2-byte
// Bit 7 = Two Continuations
constexpr const uint8_t TOO_SHORT = 1<<0; // 11______ 0_______
// 11______ 11______
constexpr const uint8_t TOO_LONG = 1<<1; // 0_______ 10______
constexpr const uint8_t OVERLONG_3 = 1<<2; // 11100000 100_____
constexpr const uint8_t SURROGATE = 1<<4; // 11101101 101_____
constexpr const uint8_t OVERLONG_2 = 1<<5; // 1100000_ 10______
constexpr const uint8_t TWO_CONTS = 1<<7; // 10______ 10______
constexpr const uint8_t TOO_LARGE = 1<<3; // 11110100 1001____
// 11110100 101_____
// 11110101 1001____
// 11110101 101_____
// 1111011_ 1001____
// 1111011_ 101_____
// 11111___ 1001____
// 11111___ 101_____
constexpr const uint8_t TOO_LARGE_1000 = 1<<6;
// 11110101 1000____
// 1111011_ 1000____
// 11111___ 1000____
constexpr const uint8_t OVERLONG_4 = 1<<6; // 11110000 1000____
const simd8<uint8_t> byte_1_high = prev1.shr<4>().lookup_16<uint8_t>(
// 0_______ ________ <ASCII in byte 1>
TOO_LONG, TOO_LONG, TOO_LONG, TOO_LONG,
TOO_LONG, TOO_LONG, TOO_LONG, TOO_LONG,
// 10______ ________ <continuation in byte 1>
TWO_CONTS, TWO_CONTS, TWO_CONTS, TWO_CONTS,
// 1100____ ________ <two byte lead in byte 1>
TOO_SHORT | OVERLONG_2,
// 1101____ ________ <two byte lead in byte 1>
TOO_SHORT,
// 1110____ ________ <three byte lead in byte 1>
TOO_SHORT | OVERLONG_3 | SURROGATE,
// 1111____ ________ <four+ byte lead in byte 1>
TOO_SHORT | TOO_LARGE | TOO_LARGE_1000 | OVERLONG_4
);
constexpr const uint8_t CARRY = TOO_SHORT | TOO_LONG | TWO_CONTS; // These all have ____ in byte 1 .
const simd8<uint8_t> byte_1_low = (prev1 & 0x0F).lookup_16<uint8_t>(
// ____0000 ________
CARRY | OVERLONG_3 | OVERLONG_2 | OVERLONG_4,
// ____0001 ________
CARRY | OVERLONG_2,
// ____001_ ________
CARRY,
CARRY,
// ____0100 ________
CARRY | TOO_LARGE,
// ____0101 ________
CARRY | TOO_LARGE | TOO_LARGE_1000,
// ____011_ ________
CARRY | TOO_LARGE | TOO_LARGE_1000,
CARRY | TOO_LARGE | TOO_LARGE_1000,
// ____1___ ________
CARRY | TOO_LARGE | TOO_LARGE_1000,
CARRY | TOO_LARGE | TOO_LARGE_1000,
CARRY | TOO_LARGE | TOO_LARGE_1000,
CARRY | TOO_LARGE | TOO_LARGE_1000,
CARRY | TOO_LARGE | TOO_LARGE_1000,
// ____1101 ________
CARRY | TOO_LARGE | TOO_LARGE_1000 | SURROGATE,
CARRY | TOO_LARGE | TOO_LARGE_1000,
CARRY | TOO_LARGE | TOO_LARGE_1000
);
const simd8<uint8_t> byte_2_high = input.shr<4>().lookup_16<uint8_t>(
// ________ 0_______ <ASCII in byte 2>
TOO_SHORT, TOO_SHORT, TOO_SHORT, TOO_SHORT,
TOO_SHORT, TOO_SHORT, TOO_SHORT, TOO_SHORT,
// ________ 1000____
TOO_LONG | OVERLONG_2 | TWO_CONTS | OVERLONG_3 | TOO_LARGE_1000 | OVERLONG_4,
// ________ 1001____
TOO_LONG | OVERLONG_2 | TWO_CONTS | OVERLONG_3 | TOO_LARGE,
// ________ 101_____
TOO_LONG | OVERLONG_2 | TWO_CONTS | SURROGATE | TOO_LARGE,
TOO_LONG | OVERLONG_2 | TWO_CONTS | SURROGATE | TOO_LARGE,
// ________ 11______
TOO_SHORT, TOO_SHORT, TOO_SHORT, TOO_SHORT
);
return (byte_1_high & byte_1_low & byte_2_high);
}
simdjson_inline simd8<uint8_t> check_multibyte_lengths(const simd8<uint8_t> input,
const simd8<uint8_t> prev_input, const simd8<uint8_t> sc) {
simd8<uint8_t> prev2 = input.prev<2>(prev_input);
simd8<uint8_t> prev3 = input.prev<3>(prev_input);
simd8<uint8_t> must23 = must_be_2_3_continuation(prev2, prev3);
simd8<uint8_t> must23_80 = must23 & uint8_t(0x80);
return must23_80 ^ sc;
}
//
// Return nonzero if there are incomplete multibyte characters at the end of the block:
// e.g. if there is a 4-byte character, but it's 3 bytes from the end.
//
simdjson_inline simd8<uint8_t> is_incomplete(const simd8<uint8_t> input) {
// If the previous input's last 3 bytes match this, they're too short (they ended at EOF):
// ... 1111____ 111_____ 11______
#if SIMDJSON_IMPLEMENTATION_ICELAKE
static const uint8_t max_array[64] = {
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 0xf0u-1, 0xe0u-1, 0xc0u-1
};
#else
static const uint8_t max_array[32] = {
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 0xf0u-1, 0xe0u-1, 0xc0u-1
};
#endif
const simd8<uint8_t> max_value(&max_array[sizeof(max_array)-sizeof(simd8<uint8_t>)]);
return input.gt_bits(max_value);
}
struct utf8_checker {
// If this is nonzero, there has been a UTF-8 error.
simd8<uint8_t> error;
// The last input we received
simd8<uint8_t> prev_input_block;
// Whether the last input we received was incomplete (used for ASCII fast path)
simd8<uint8_t> prev_incomplete;
//
// Check whether the current bytes are valid UTF-8.
//
simdjson_inline void check_utf8_bytes(const simd8<uint8_t> input, const simd8<uint8_t> prev_input) {
// Flip prev1...prev3 so we can easily determine if they are 2+, 3+ or 4+ lead bytes
// (2, 3, 4-byte leads become large positive numbers instead of small negative numbers)
simd8<uint8_t> prev1 = input.prev<1>(prev_input);
simd8<uint8_t> sc = check_special_cases(input, prev1);
this->error |= check_multibyte_lengths(input, prev_input, sc);
}
// The only problem that can happen at EOF is that a multibyte character is too short
// or a byte value too large in the last bytes: check_special_cases only checks for bytes
// too large in the first of two bytes.
simdjson_inline void check_eof() {
// If the previous block had incomplete UTF-8 characters at the end, an ASCII block can't
// possibly finish them.
this->error |= this->prev_incomplete;
}
simdjson_inline void check_next_input(const simd8x64<uint8_t>& input) {
if(simdjson_likely(is_ascii(input))) {
this->error |= this->prev_incomplete;
} else {
// you might think that a for-loop would work, but under Visual Studio, it is not good enough.
static_assert((simd8x64<uint8_t>::NUM_CHUNKS == 1)
||(simd8x64<uint8_t>::NUM_CHUNKS == 2)
|| (simd8x64<uint8_t>::NUM_CHUNKS == 4),
"We support one, two or four chunks per 64-byte block.");
SIMDJSON_IF_CONSTEXPR (simd8x64<uint8_t>::NUM_CHUNKS == 1) {
this->check_utf8_bytes(input.chunks[0], this->prev_input_block);
} else SIMDJSON_IF_CONSTEXPR (simd8x64<uint8_t>::NUM_CHUNKS == 2) {
this->check_utf8_bytes(input.chunks[0], this->prev_input_block);
this->check_utf8_bytes(input.chunks[1], input.chunks[0]);
} else SIMDJSON_IF_CONSTEXPR (simd8x64<uint8_t>::NUM_CHUNKS == 4) {
this->check_utf8_bytes(input.chunks[0], this->prev_input_block);
this->check_utf8_bytes(input.chunks[1], input.chunks[0]);
this->check_utf8_bytes(input.chunks[2], input.chunks[1]);
this->check_utf8_bytes(input.chunks[3], input.chunks[2]);
}
this->prev_incomplete = is_incomplete(input.chunks[simd8x64<uint8_t>::NUM_CHUNKS-1]);
this->prev_input_block = input.chunks[simd8x64<uint8_t>::NUM_CHUNKS-1];
}
}
// do not forget to call check_eof!
simdjson_inline error_code errors() {
return this->error.any_bits_set_anywhere() ? error_code::UTF8_ERROR : error_code::SUCCESS;
}
}; // struct utf8_checker
} // namespace utf8_validation
} // unnamed namespace
} // namespace ppc64
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE1_UTF8_LOOKUP4_ALGORITHM_H
/* end file generic/stage1/utf8_lookup4_algorithm.h for ppc64 */
/* including generic/stage1/json_scanner.h for ppc64: #include <generic/stage1/json_scanner.h> */
/* begin file generic/stage1/json_scanner.h for ppc64 */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_JSON_SCANNER_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_JSON_SCANNER_H */
/* amalgamation skipped (editor-only): #include <generic/stage1/base.h> */
/* amalgamation skipped (editor-only): #include <generic/json_character_block.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/json_string_scanner.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace ppc64 {
namespace {
namespace stage1 {
/**
* A block of scanned json, with information on operators and scalars.
*
* We seek to identify pseudo-structural characters. Anything that is inside
* a string must be omitted (hence & ~_string.string_tail()).
* Otherwise, pseudo-structural characters come in two forms.
* 1. We have the structural characters ([,],{,},:, comma). The
* term 'structural character' is from the JSON RFC.
* 2. We have the 'scalar pseudo-structural characters'.
* Scalars are quotes, and any character except structural characters and white space.
*
* To identify the scalar pseudo-structural characters, we must look at what comes
* before them: it must be a space, a quote or a structural characters.
* Starting with simdjson v0.3, we identify them by
* negation: we identify everything that is followed by a non-quote scalar,
* and we negate that. Whatever remains must be a 'scalar pseudo-structural character'.
*/
struct json_block {
public:
// We spell out the constructors in the hope of resolving inlining issues with Visual Studio 2017
simdjson_inline json_block(json_string_block&& string, json_character_block characters, uint64_t follows_potential_nonquote_scalar) :
_string(std::move(string)), _characters(characters), _follows_potential_nonquote_scalar(follows_potential_nonquote_scalar) {}
simdjson_inline json_block(json_string_block string, json_character_block characters, uint64_t follows_potential_nonquote_scalar) :
_string(string), _characters(characters), _follows_potential_nonquote_scalar(follows_potential_nonquote_scalar) {}
/**
* The start of structurals.
* In simdjson prior to v0.3, these were called the pseudo-structural characters.
**/
simdjson_inline uint64_t structural_start() const noexcept { return potential_structural_start() & ~_string.string_tail(); }
/** All JSON whitespace (i.e. not in a string) */
simdjson_inline uint64_t whitespace() const noexcept { return non_quote_outside_string(_characters.whitespace()); }
// Helpers
/** Whether the given characters are inside a string (only works on non-quotes) */
simdjson_inline uint64_t non_quote_inside_string(uint64_t mask) const noexcept { return _string.non_quote_inside_string(mask); }
/** Whether the given characters are outside a string (only works on non-quotes) */
simdjson_inline uint64_t non_quote_outside_string(uint64_t mask) const noexcept { return _string.non_quote_outside_string(mask); }
// string and escape characters
json_string_block _string;
// whitespace, structural characters ('operators'), scalars
json_character_block _characters;
// whether the previous character was a scalar
uint64_t _follows_potential_nonquote_scalar;
private:
// Potential structurals (i.e. disregarding strings)
/**
* structural elements ([,],{,},:, comma) plus scalar starts like 123, true and "abc".
* They may reside inside a string.
**/
simdjson_inline uint64_t potential_structural_start() const noexcept { return _characters.op() | potential_scalar_start(); }
/**
* The start of non-operator runs, like 123, true and "abc".
* It main reside inside a string.
**/
simdjson_inline uint64_t potential_scalar_start() const noexcept {
// The term "scalar" refers to anything except structural characters and white space
// (so letters, numbers, quotes).
// Whenever it is preceded by something that is not a structural element ({,},[,],:, ") nor a white-space
// then we know that it is irrelevant structurally.
return _characters.scalar() & ~follows_potential_scalar();
}
/**
* Whether the given character is immediately after a non-operator like 123, true.
* The characters following a quote are not included.
*/
simdjson_inline uint64_t follows_potential_scalar() const noexcept {
// _follows_potential_nonquote_scalar: is defined as marking any character that follows a character
// that is not a structural element ({,},[,],:, comma) nor a quote (") and that is not a
// white space.
// It is understood that within quoted region, anything at all could be marked (irrelevant).
return _follows_potential_nonquote_scalar;
}
};
/**
* Scans JSON for important bits: structural characters or 'operators', strings, and scalars.
*
* The scanner starts by calculating two distinct things:
* - string characters (taking \" into account)
* - structural characters or 'operators' ([]{},:, comma)
* and scalars (runs of non-operators like 123, true and "abc")
*
* To minimize data dependency (a key component of the scanner's speed), it finds these in parallel:
* in particular, the operator/scalar bit will find plenty of things that are actually part of
* strings. When we're done, json_block will fuse the two together by masking out tokens that are
* part of a string.
*/
class json_scanner {
public:
json_scanner() = default;
simdjson_inline json_block next(const simd::simd8x64<uint8_t>& in);
// Returns either UNCLOSED_STRING or SUCCESS
simdjson_inline error_code finish();
private:
// Whether the last character of the previous iteration is part of a scalar token
// (anything except whitespace or a structural character/'operator').
uint64_t prev_scalar = 0ULL;
json_string_scanner string_scanner{};
};
//
// Check if the current character immediately follows a matching character.
//
// For example, this checks for quotes with backslashes in front of them:
//
// const uint64_t backslashed_quote = in.eq('"') & immediately_follows(in.eq('\'), prev_backslash);
//
simdjson_inline uint64_t follows(const uint64_t match, uint64_t &overflow) {
const uint64_t result = match << 1 | overflow;
overflow = match >> 63;
return result;
}
simdjson_inline json_block json_scanner::next(const simd::simd8x64<uint8_t>& in) {
json_string_block strings = string_scanner.next(in);
// identifies the white-space and the structural characters
json_character_block characters = json_character_block::classify(in);
// The term "scalar" refers to anything except structural characters and white space
// (so letters, numbers, quotes).
// We want follows_scalar to mark anything that follows a non-quote scalar (so letters and numbers).
//
// A terminal quote should either be followed by a structural character (comma, brace, bracket, colon)
// or nothing. However, we still want ' "a string"true ' to mark the 't' of 'true' as a potential
// pseudo-structural character just like we would if we had ' "a string" true '; otherwise we
// may need to add an extra check when parsing strings.
//
// Performance: there are many ways to skin this cat.
const uint64_t nonquote_scalar = characters.scalar() & ~strings.quote();
uint64_t follows_nonquote_scalar = follows(nonquote_scalar, prev_scalar);
// We are returning a function-local object so either we get a move constructor
// or we get copy elision.
return json_block(
strings,// strings is a function-local object so either it moves or the copy is elided.
characters,
follows_nonquote_scalar
);
}
simdjson_inline error_code json_scanner::finish() {
return string_scanner.finish();
}
} // namespace stage1
} // unnamed namespace
} // namespace ppc64
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE1_JSON_SCANNER_H
/* end file generic/stage1/json_scanner.h for ppc64 */
// All other declarations
/* including generic/stage1/find_next_document_index.h for ppc64: #include <generic/stage1/find_next_document_index.h> */
/* begin file generic/stage1/find_next_document_index.h for ppc64 */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_FIND_NEXT_DOCUMENT_INDEX_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_FIND_NEXT_DOCUMENT_INDEX_H */
/* amalgamation skipped (editor-only): #include <generic/stage1/base.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/dom_parser_implementation.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace ppc64 {
namespace {
namespace stage1 {
/**
* This algorithm is used to quickly identify the last structural position that
* makes up a complete document.
*
* It does this by going backwards and finding the last *document boundary* (a
* place where one value follows another without a comma between them). If the
* last document (the characters after the boundary) has an equal number of
* start and end brackets, it is considered complete.
*
* Simply put, we iterate over the structural characters, starting from
* the end. We consider that we found the end of a JSON document when the
* first element of the pair is NOT one of these characters: '{' '[' ':' ','
* and when the second element is NOT one of these characters: '}' ']' ':' ','.
*
* This simple comparison works most of the time, but it does not cover cases
* where the batch's structural indexes contain a perfect amount of documents.
* In such a case, we do not have access to the structural index which follows
* the last document, therefore, we do not have access to the second element in
* the pair, and that means we cannot identify the last document. To fix this
* issue, we keep a count of the open and closed curly/square braces we found
* while searching for the pair. When we find a pair AND the count of open and
* closed curly/square braces is the same, we know that we just passed a
* complete document, therefore the last json buffer location is the end of the
* batch.
*/
simdjson_inline uint32_t find_next_document_index(dom_parser_implementation &parser) {
// Variant: do not count separately, just figure out depth
if(parser.n_structural_indexes == 0) { return 0; }
auto arr_cnt = 0;
auto obj_cnt = 0;
for (auto i = parser.n_structural_indexes - 1; i > 0; i--) {
auto idxb = parser.structural_indexes[i];
switch (parser.buf[idxb]) {
case ':':
case ',':
continue;
case '}':
obj_cnt--;
continue;
case ']':
arr_cnt--;
continue;
case '{':
obj_cnt++;
break;
case '[':
arr_cnt++;
break;
}
auto idxa = parser.structural_indexes[i - 1];
switch (parser.buf[idxa]) {
case '{':
case '[':
case ':':
case ',':
continue;
}
// Last document is complete, so the next document will appear after!
if (!arr_cnt && !obj_cnt) {
return parser.n_structural_indexes;
}
// Last document is incomplete; mark the document at i + 1 as the next one
return i;
}
// If we made it to the end, we want to finish counting to see if we have a full document.
switch (parser.buf[parser.structural_indexes[0]]) {
case '}':
obj_cnt--;
break;
case ']':
arr_cnt--;
break;
case '{':
obj_cnt++;
break;
case '[':
arr_cnt++;
break;
}
if (!arr_cnt && !obj_cnt) {
// We have a complete document.
return parser.n_structural_indexes;
}
return 0;
}
} // namespace stage1
} // unnamed namespace
} // namespace ppc64
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE1_FIND_NEXT_DOCUMENT_INDEX_H
/* end file generic/stage1/find_next_document_index.h for ppc64 */
/* including generic/stage1/json_minifier.h for ppc64: #include <generic/stage1/json_minifier.h> */
/* begin file generic/stage1/json_minifier.h for ppc64 */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_JSON_MINIFIER_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_JSON_MINIFIER_H */
/* amalgamation skipped (editor-only): #include <generic/stage1/base.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/json_scanner.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/buf_block_reader.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
// This file contains the common code every implementation uses in stage1
// It is intended to be included multiple times and compiled multiple times
// We assume the file in which it is included already includes
// "simdjson/stage1.h" (this simplifies amalgation)
namespace simdjson {
namespace ppc64 {
namespace {
namespace stage1 {
class json_minifier {
public:
template<size_t STEP_SIZE>
static error_code minify(const uint8_t *buf, size_t len, uint8_t *dst, size_t &dst_len) noexcept;
private:
simdjson_inline json_minifier(uint8_t *_dst)
: dst{_dst}
{}
template<size_t STEP_SIZE>
simdjson_inline void step(const uint8_t *block_buf, buf_block_reader<STEP_SIZE> &reader) noexcept;
simdjson_inline void next(const simd::simd8x64<uint8_t>& in, const json_block& block);
simdjson_inline error_code finish(uint8_t *dst_start, size_t &dst_len);
json_scanner scanner{};
uint8_t *dst;
};
simdjson_inline void json_minifier::next(const simd::simd8x64<uint8_t>& in, const json_block& block) {
uint64_t mask = block.whitespace();
dst += in.compress(mask, dst);
}
simdjson_inline error_code json_minifier::finish(uint8_t *dst_start, size_t &dst_len) {
error_code error = scanner.finish();
if (error) { dst_len = 0; return error; }
dst_len = dst - dst_start;
return SUCCESS;
}
template<>
simdjson_inline void json_minifier::step<128>(const uint8_t *block_buf, buf_block_reader<128> &reader) noexcept {
simd::simd8x64<uint8_t> in_1(block_buf);
simd::simd8x64<uint8_t> in_2(block_buf+64);
json_block block_1 = scanner.next(in_1);
json_block block_2 = scanner.next(in_2);
this->next(in_1, block_1);
this->next(in_2, block_2);
reader.advance();
}
template<>
simdjson_inline void json_minifier::step<64>(const uint8_t *block_buf, buf_block_reader<64> &reader) noexcept {
simd::simd8x64<uint8_t> in_1(block_buf);
json_block block_1 = scanner.next(in_1);
this->next(block_buf, block_1);
reader.advance();
}
template<size_t STEP_SIZE>
error_code json_minifier::minify(const uint8_t *buf, size_t len, uint8_t *dst, size_t &dst_len) noexcept {
buf_block_reader<STEP_SIZE> reader(buf, len);
json_minifier minifier(dst);
// Index the first n-1 blocks
while (reader.has_full_block()) {
minifier.step<STEP_SIZE>(reader.full_block(), reader);
}
// Index the last (remainder) block, padded with spaces
uint8_t block[STEP_SIZE];
size_t remaining_bytes = reader.get_remainder(block);
if (remaining_bytes > 0) {
// We do not want to write directly to the output stream. Rather, we write
// to a local buffer (for safety).
uint8_t out_block[STEP_SIZE];
uint8_t * const guarded_dst{minifier.dst};
minifier.dst = out_block;
minifier.step<STEP_SIZE>(block, reader);
size_t to_write = minifier.dst - out_block;
// In some cases, we could be enticed to consider the padded spaces
// as part of the string. This is fine as long as we do not write more
// than we consumed.
if(to_write > remaining_bytes) { to_write = remaining_bytes; }
memcpy(guarded_dst, out_block, to_write);
minifier.dst = guarded_dst + to_write;
}
return minifier.finish(dst, dst_len);
}
} // namespace stage1
} // unnamed namespace
} // namespace ppc64
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE1_JSON_MINIFIER_H
/* end file generic/stage1/json_minifier.h for ppc64 */
/* including generic/stage1/json_structural_indexer.h for ppc64: #include <generic/stage1/json_structural_indexer.h> */
/* begin file generic/stage1/json_structural_indexer.h for ppc64 */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_JSON_STRUCTURAL_INDEXER_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_JSON_STRUCTURAL_INDEXER_H */
/* amalgamation skipped (editor-only): #include <generic/stage1/base.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/utf8_lookup4_algorithm.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/buf_block_reader.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/json_string_scanner.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/json_scanner.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/json_minifier.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/find_next_document_index.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
// This file contains the common code every implementation uses in stage1
// It is intended to be included multiple times and compiled multiple times
// We assume the file in which it is included already includes
// "simdjson/stage1.h" (this simplifies amalgation)
namespace simdjson {
namespace ppc64 {
namespace {
namespace stage1 {
class bit_indexer {
public:
uint32_t *tail;
simdjson_inline bit_indexer(uint32_t *index_buf) : tail(index_buf) {}
#if SIMDJSON_PREFER_REVERSE_BITS
/**
* ARM lacks a fast trailing zero instruction, but it has a fast
* bit reversal instruction and a fast leading zero instruction.
* Thus it may be profitable to reverse the bits (once) and then
* to rely on a sequence of instructions that call the leading
* zero instruction.
*
* Performance notes:
* The chosen routine is not optimal in terms of data dependency
* since zero_leading_bit might require two instructions. However,
* it tends to minimize the total number of instructions which is
* beneficial.
*/
simdjson_inline void write_index(uint32_t idx, uint64_t& rev_bits, int i) {
int lz = leading_zeroes(rev_bits);
this->tail[i] = static_cast<uint32_t>(idx) + lz;
rev_bits = zero_leading_bit(rev_bits, lz);
}
#else
/**
* Under recent x64 systems, we often have both a fast trailing zero
* instruction and a fast 'clear-lower-bit' instruction so the following
* algorithm can be competitive.
*/
simdjson_inline void write_index(uint32_t idx, uint64_t& bits, int i) {
this->tail[i] = idx + trailing_zeroes(bits);
bits = clear_lowest_bit(bits);
}
#endif // SIMDJSON_PREFER_REVERSE_BITS
template <int START, int N>
simdjson_inline int write_indexes(uint32_t idx, uint64_t& bits) {
write_index(idx, bits, START);
SIMDJSON_IF_CONSTEXPR (N > 1) {
write_indexes<(N-1>0?START+1:START), (N-1>=0?N-1:1)>(idx, bits);
}
return START+N;
}
template <int START, int END, int STEP>
simdjson_inline int write_indexes_stepped(uint32_t idx, uint64_t& bits, int cnt) {
write_indexes<START, STEP>(idx, bits);
SIMDJSON_IF_CONSTEXPR ((START+STEP) < END) {
if (simdjson_unlikely((START+STEP) < cnt)) {
write_indexes_stepped<(START+STEP<END?START+STEP:END), END, STEP>(idx, bits, cnt);
}
}
return ((END-START) % STEP) == 0 ? END : (END-START) - ((END-START) % STEP) + STEP;
}
// flatten out values in 'bits' assuming that they are are to have values of idx
// plus their position in the bitvector, and store these indexes at
// base_ptr[base] incrementing base as we go
// will potentially store extra values beyond end of valid bits, so base_ptr
// needs to be large enough to handle this
//
// If the kernel sets SIMDJSON_GENERIC_JSON_STRUCTURAL_INDEXER_CUSTOM_BIT_INDEXER, then it
// will provide its own version of the code.
#ifdef SIMDJSON_GENERIC_JSON_STRUCTURAL_INDEXER_CUSTOM_BIT_INDEXER
simdjson_inline void write(uint32_t idx, uint64_t bits);
#else
simdjson_inline void write(uint32_t idx, uint64_t bits) {
// In some instances, the next branch is expensive because it is mispredicted.
// Unfortunately, in other cases,
// it helps tremendously.
if (bits == 0)
return;
int cnt = static_cast<int>(count_ones(bits));
#if SIMDJSON_PREFER_REVERSE_BITS
bits = reverse_bits(bits);
#endif
#ifdef SIMDJSON_STRUCTURAL_INDEXER_STEP
static constexpr const int STEP = SIMDJSON_STRUCTURAL_INDEXER_STEP;
#else
static constexpr const int STEP = 4;
#endif
static constexpr const int STEP_UNTIL = 24;
write_indexes_stepped<0, STEP_UNTIL, STEP>(idx, bits, cnt);
SIMDJSON_IF_CONSTEXPR (STEP_UNTIL < 64) {
if (simdjson_unlikely(STEP_UNTIL < cnt)) {
for (int i=STEP_UNTIL; i<cnt; i++) {
write_index(idx, bits, i);
}
}
}
this->tail += cnt;
}
#endif // SIMDJSON_GENERIC_JSON_STRUCTURAL_INDEXER_CUSTOM_BIT_INDEXER
};
class json_structural_indexer {
public:
/**
* Find the important bits of JSON in a 128-byte chunk, and add them to structural_indexes.
*
* @param partial Setting the partial parameter to true allows the find_structural_bits to
* tolerate unclosed strings. The caller should still ensure that the input is valid UTF-8. If
* you are processing substrings, you may want to call on a function like trimmed_length_safe_utf8.
*/
template<size_t STEP_SIZE>
static error_code index(const uint8_t *buf, size_t len, dom_parser_implementation &parser, stage1_mode partial) noexcept;
private:
simdjson_inline json_structural_indexer(uint32_t *structural_indexes);
template<size_t STEP_SIZE>
simdjson_inline void step(const uint8_t *block, buf_block_reader<STEP_SIZE> &reader) noexcept;
simdjson_inline void next(const simd::simd8x64<uint8_t>& in, const json_block& block, size_t idx);
simdjson_inline error_code finish(dom_parser_implementation &parser, size_t idx, size_t len, stage1_mode partial);
json_scanner scanner{};
utf8_checker checker{};
bit_indexer indexer;
uint64_t prev_structurals = 0;
uint64_t unescaped_chars_error = 0;
};
simdjson_inline json_structural_indexer::json_structural_indexer(uint32_t *structural_indexes) : indexer{structural_indexes} {}
// Skip the last character if it is partial
simdjson_inline size_t trim_partial_utf8(const uint8_t *buf, size_t len) {
if (simdjson_unlikely(len < 3)) {
switch (len) {
case 2:
if (buf[len-1] >= 0xc0) { return len-1; } // 2-, 3- and 4-byte characters with only 1 byte left
if (buf[len-2] >= 0xe0) { return len-2; } // 3- and 4-byte characters with only 2 bytes left
return len;
case 1:
if (buf[len-1] >= 0xc0) { return len-1; } // 2-, 3- and 4-byte characters with only 1 byte left
return len;
case 0:
return len;
}
}
if (buf[len-1] >= 0xc0) { return len-1; } // 2-, 3- and 4-byte characters with only 1 byte left
if (buf[len-2] >= 0xe0) { return len-2; } // 3- and 4-byte characters with only 1 byte left
if (buf[len-3] >= 0xf0) { return len-3; } // 4-byte characters with only 3 bytes left
return len;
}
//
// PERF NOTES:
// We pipe 2 inputs through these stages:
// 1. Load JSON into registers. This takes a long time and is highly parallelizable, so we load
// 2 inputs' worth at once so that by the time step 2 is looking for them input, it's available.
// 2. Scan the JSON for critical data: strings, scalars and operators. This is the critical path.
// The output of step 1 depends entirely on this information. These functions don't quite use
// up enough CPU: the second half of the functions is highly serial, only using 1 execution core
// at a time. The second input's scans has some dependency on the first ones finishing it, but
// they can make a lot of progress before they need that information.
// 3. Step 1 does not use enough capacity, so we run some extra stuff while we're waiting for that
// to finish: utf-8 checks and generating the output from the last iteration.
//
// The reason we run 2 inputs at a time, is steps 2 and 3 are *still* not enough to soak up all
// available capacity with just one input. Running 2 at a time seems to give the CPU a good enough
// workout.
//
template<size_t STEP_SIZE>
error_code json_structural_indexer::index(const uint8_t *buf, size_t len, dom_parser_implementation &parser, stage1_mode partial) noexcept {
if (simdjson_unlikely(len > parser.capacity())) { return CAPACITY; }
// We guard the rest of the code so that we can assume that len > 0 throughout.
if (len == 0) { return EMPTY; }
if (is_streaming(partial)) {
len = trim_partial_utf8(buf, len);
// If you end up with an empty window after trimming
// the partial UTF-8 bytes, then chances are good that you
// have an UTF-8 formatting error.
if(len == 0) { return UTF8_ERROR; }
}
buf_block_reader<STEP_SIZE> reader(buf, len);
json_structural_indexer indexer(parser.structural_indexes.get());
// Read all but the last block
while (reader.has_full_block()) {
indexer.step<STEP_SIZE>(reader.full_block(), reader);
}
// Take care of the last block (will always be there unless file is empty which is
// not supposed to happen.)
uint8_t block[STEP_SIZE];
if (simdjson_unlikely(reader.get_remainder(block) == 0)) { return UNEXPECTED_ERROR; }
indexer.step<STEP_SIZE>(block, reader);
return indexer.finish(parser, reader.block_index(), len, partial);
}
template<>
simdjson_inline void json_structural_indexer::step<128>(const uint8_t *block, buf_block_reader<128> &reader) noexcept {
simd::simd8x64<uint8_t> in_1(block);
simd::simd8x64<uint8_t> in_2(block+64);
json_block block_1 = scanner.next(in_1);
json_block block_2 = scanner.next(in_2);
this->next(in_1, block_1, reader.block_index());
this->next(in_2, block_2, reader.block_index()+64);
reader.advance();
}
template<>
simdjson_inline void json_structural_indexer::step<64>(const uint8_t *block, buf_block_reader<64> &reader) noexcept {
simd::simd8x64<uint8_t> in_1(block);
json_block block_1 = scanner.next(in_1);
this->next(in_1, block_1, reader.block_index());
reader.advance();
}
simdjson_inline void json_structural_indexer::next(const simd::simd8x64<uint8_t>& in, const json_block& block, size_t idx) {
uint64_t unescaped = in.lteq(0x1F);
#if SIMDJSON_UTF8VALIDATION
checker.check_next_input(in);
#endif
indexer.write(uint32_t(idx-64), prev_structurals); // Output *last* iteration's structurals to the parser
prev_structurals = block.structural_start();
unescaped_chars_error |= block.non_quote_inside_string(unescaped);
}
simdjson_inline error_code json_structural_indexer::finish(dom_parser_implementation &parser, size_t idx, size_t len, stage1_mode partial) {
// Write out the final iteration's structurals
indexer.write(uint32_t(idx-64), prev_structurals);
error_code error = scanner.finish();
// We deliberately break down the next expression so that it is
// human readable.
const bool should_we_exit = is_streaming(partial) ?
((error != SUCCESS) && (error != UNCLOSED_STRING)) // when partial we tolerate UNCLOSED_STRING
: (error != SUCCESS); // if partial is false, we must have SUCCESS
const bool have_unclosed_string = (error == UNCLOSED_STRING);
if (simdjson_unlikely(should_we_exit)) { return error; }
if (unescaped_chars_error) {
return UNESCAPED_CHARS;
}
parser.n_structural_indexes = uint32_t(indexer.tail - parser.structural_indexes.get());
/***
* The On Demand API requires special padding.
*
* This is related to https://github.com/simdjson/simdjson/issues/906
* Basically, we want to make sure that if the parsing continues beyond the last (valid)
* structural character, it quickly stops.
* Only three structural characters can be repeated without triggering an error in JSON: [,] and }.
* We repeat the padding character (at 'len'). We don't know what it is, but if the parsing
* continues, then it must be [,] or }.
* Suppose it is ] or }. We backtrack to the first character, what could it be that would
* not trigger an error? It could be ] or } but no, because you can't start a document that way.
* It can't be a comma, a colon or any simple value. So the only way we could continue is
* if the repeated character is [. But if so, the document must start with [. But if the document
* starts with [, it should end with ]. If we enforce that rule, then we would get
* ][[ which is invalid.
*
* This is illustrated with the test array_iterate_unclosed_error() on the following input:
* R"({ "a": [,,)"
**/
parser.structural_indexes[parser.n_structural_indexes] = uint32_t(len); // used later in partial == stage1_mode::streaming_final
parser.structural_indexes[parser.n_structural_indexes + 1] = uint32_t(len);
parser.structural_indexes[parser.n_structural_indexes + 2] = 0;
parser.next_structural_index = 0;
// a valid JSON file cannot have zero structural indexes - we should have found something
if (simdjson_unlikely(parser.n_structural_indexes == 0u)) {
return EMPTY;
}
if (simdjson_unlikely(parser.structural_indexes[parser.n_structural_indexes - 1] > len)) {
return UNEXPECTED_ERROR;
}
if (partial == stage1_mode::streaming_partial) {
// If we have an unclosed string, then the last structural
// will be the quote and we want to make sure to omit it.
if(have_unclosed_string) {
parser.n_structural_indexes--;
// a valid JSON file cannot have zero structural indexes - we should have found something
if (simdjson_unlikely(parser.n_structural_indexes == 0u)) { return CAPACITY; }
}
// We truncate the input to the end of the last complete document (or zero).
auto new_structural_indexes = find_next_document_index(parser);
if (new_structural_indexes == 0 && parser.n_structural_indexes > 0) {
if(parser.structural_indexes[0] == 0) {
// If the buffer is partial and we started at index 0 but the document is
// incomplete, it's too big to parse.
return CAPACITY;
} else {
// It is possible that the document could be parsed, we just had a lot
// of white space.
parser.n_structural_indexes = 0;
return EMPTY;
}
}
parser.n_structural_indexes = new_structural_indexes;
} else if (partial == stage1_mode::streaming_final) {
if(have_unclosed_string) { parser.n_structural_indexes--; }
// We truncate the input to the end of the last complete document (or zero).
// Because partial == stage1_mode::streaming_final, it means that we may
// silently ignore trailing garbage. Though it sounds bad, we do it
// deliberately because many people who have streams of JSON documents
// will truncate them for processing. E.g., imagine that you are uncompressing
// the data from a size file or receiving it in chunks from the network. You
// may not know where exactly the last document will be. Meanwhile the
// document_stream instances allow people to know the JSON documents they are
// parsing (see the iterator.source() method).
parser.n_structural_indexes = find_next_document_index(parser);
// We store the initial n_structural_indexes so that the client can see
// whether we used truncation. If initial_n_structural_indexes == parser.n_structural_indexes,
// then this will query parser.structural_indexes[parser.n_structural_indexes] which is len,
// otherwise, it will copy some prior index.
parser.structural_indexes[parser.n_structural_indexes + 1] = parser.structural_indexes[parser.n_structural_indexes];
// This next line is critical, do not change it unless you understand what you are
// doing.
parser.structural_indexes[parser.n_structural_indexes] = uint32_t(len);
if (simdjson_unlikely(parser.n_structural_indexes == 0u)) {
// We tolerate an unclosed string at the very end of the stream. Indeed, users
// often load their data in bulk without being careful and they want us to ignore
// the trailing garbage.
return EMPTY;
}
}
checker.check_eof();
return checker.errors();
}
} // namespace stage1
} // unnamed namespace
} // namespace ppc64
} // namespace simdjson
// Clear CUSTOM_BIT_INDEXER so other implementations can set it if they need to.
#undef SIMDJSON_GENERIC_JSON_STRUCTURAL_INDEXER_CUSTOM_BIT_INDEXER
#endif // SIMDJSON_SRC_GENERIC_STAGE1_JSON_STRUCTURAL_INDEXER_H
/* end file generic/stage1/json_structural_indexer.h for ppc64 */
/* including generic/stage1/utf8_validator.h for ppc64: #include <generic/stage1/utf8_validator.h> */
/* begin file generic/stage1/utf8_validator.h for ppc64 */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_UTF8_VALIDATOR_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_UTF8_VALIDATOR_H */
/* amalgamation skipped (editor-only): #include <generic/stage1/base.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/buf_block_reader.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/utf8_lookup4_algorithm.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace ppc64 {
namespace {
namespace stage1 {
/**
* Validates that the string is actual UTF-8.
*/
template<class checker>
bool generic_validate_utf8(const uint8_t * input, size_t length) {
checker c{};
buf_block_reader<64> reader(input, length);
while (reader.has_full_block()) {
simd::simd8x64<uint8_t> in(reader.full_block());
c.check_next_input(in);
reader.advance();
}
uint8_t block[64]{};
reader.get_remainder(block);
simd::simd8x64<uint8_t> in(block);
c.check_next_input(in);
reader.advance();
c.check_eof();
return c.errors() == error_code::SUCCESS;
}
bool generic_validate_utf8(const char * input, size_t length) {
return generic_validate_utf8<utf8_checker>(reinterpret_cast<const uint8_t *>(input),length);
}
} // namespace stage1
} // unnamed namespace
} // namespace ppc64
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE1_UTF8_VALIDATOR_H
/* end file generic/stage1/utf8_validator.h for ppc64 */
/* end file generic/stage1/amalgamated.h for ppc64 */
/* including generic/stage2/amalgamated.h for ppc64: #include <generic/stage2/amalgamated.h> */
/* begin file generic/stage2/amalgamated.h for ppc64 */
// Stuff other things depend on
/* including generic/stage2/base.h for ppc64: #include <generic/stage2/base.h> */
/* begin file generic/stage2/base.h for ppc64 */
#ifndef SIMDJSON_SRC_GENERIC_STAGE2_BASE_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE2_BASE_H */
/* amalgamation skipped (editor-only): #include <generic/base.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace ppc64 {
namespace {
namespace stage2 {
class json_iterator;
class structural_iterator;
struct tape_builder;
struct tape_writer;
} // namespace stage2
} // unnamed namespace
} // namespace ppc64
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE2_BASE_H
/* end file generic/stage2/base.h for ppc64 */
/* including generic/stage2/tape_writer.h for ppc64: #include <generic/stage2/tape_writer.h> */
/* begin file generic/stage2/tape_writer.h for ppc64 */
#ifndef SIMDJSON_SRC_GENERIC_STAGE2_TAPE_WRITER_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE2_TAPE_WRITER_H */
/* amalgamation skipped (editor-only): #include <generic/stage2/base.h> */
/* amalgamation skipped (editor-only): #include <simdjson/internal/tape_type.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#include <cstring>
namespace simdjson {
namespace ppc64 {
namespace {
namespace stage2 {
struct tape_writer {
/** The next place to write to tape */
uint64_t *next_tape_loc;
/** Write a signed 64-bit value to tape. */
simdjson_inline void append_s64(int64_t value) noexcept;
/** Write an unsigned 64-bit value to tape. */
simdjson_inline void append_u64(uint64_t value) noexcept;
/** Write a double value to tape. */
simdjson_inline void append_double(double value) noexcept;
/**
* Append a tape entry (an 8-bit type,and 56 bits worth of value).
*/
simdjson_inline void append(uint64_t val, internal::tape_type t) noexcept;
/**
* Skip the current tape entry without writing.
*
* Used to skip the start of the container, since we'll come back later to fill it in when the
* container ends.
*/
simdjson_inline void skip() noexcept;
/**
* Skip the number of tape entries necessary to write a large u64 or i64.
*/
simdjson_inline void skip_large_integer() noexcept;
/**
* Skip the number of tape entries necessary to write a double.
*/
simdjson_inline void skip_double() noexcept;
/**
* Write a value to a known location on tape.
*
* Used to go back and write out the start of a container after the container ends.
*/
simdjson_inline static void write(uint64_t &tape_loc, uint64_t val, internal::tape_type t) noexcept;
private:
/**
* Append both the tape entry, and a supplementary value following it. Used for types that need
* all 64 bits, such as double and uint64_t.
*/
template<typename T>
simdjson_inline void append2(uint64_t val, T val2, internal::tape_type t) noexcept;
}; // struct tape_writer
simdjson_inline void tape_writer::append_s64(int64_t value) noexcept {
append2(0, value, internal::tape_type::INT64);
}
simdjson_inline void tape_writer::append_u64(uint64_t value) noexcept {
append(0, internal::tape_type::UINT64);
*next_tape_loc = value;
next_tape_loc++;
}
/** Write a double value to tape. */
simdjson_inline void tape_writer::append_double(double value) noexcept {
append2(0, value, internal::tape_type::DOUBLE);
}
simdjson_inline void tape_writer::skip() noexcept {
next_tape_loc++;
}
simdjson_inline void tape_writer::skip_large_integer() noexcept {
next_tape_loc += 2;
}
simdjson_inline void tape_writer::skip_double() noexcept {
next_tape_loc += 2;
}
simdjson_inline void tape_writer::append(uint64_t val, internal::tape_type t) noexcept {
*next_tape_loc = val | ((uint64_t(char(t))) << 56);
next_tape_loc++;
}
template<typename T>
simdjson_inline void tape_writer::append2(uint64_t val, T val2, internal::tape_type t) noexcept {
append(val, t);
static_assert(sizeof(val2) == sizeof(*next_tape_loc), "Type is not 64 bits!");
memcpy(next_tape_loc, &val2, sizeof(val2));
next_tape_loc++;
}
simdjson_inline void tape_writer::write(uint64_t &tape_loc, uint64_t val, internal::tape_type t) noexcept {
tape_loc = val | ((uint64_t(char(t))) << 56);
}
} // namespace stage2
} // unnamed namespace
} // namespace ppc64
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE2_TAPE_WRITER_H
/* end file generic/stage2/tape_writer.h for ppc64 */
/* including generic/stage2/logger.h for ppc64: #include <generic/stage2/logger.h> */
/* begin file generic/stage2/logger.h for ppc64 */
#ifndef SIMDJSON_SRC_GENERIC_STAGE2_LOGGER_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE2_LOGGER_H */
/* amalgamation skipped (editor-only): #include <generic/stage2/base.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#include <cstring>
// This is for an internal-only stage 2 specific logger.
// Set LOG_ENABLED = true to log what stage 2 is doing!
namespace simdjson {
namespace ppc64 {
namespace {
namespace logger {
static constexpr const char * DASHES = "----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------";
#if SIMDJSON_VERBOSE_LOGGING
static constexpr const bool LOG_ENABLED = true;
#else
static constexpr const bool LOG_ENABLED = false;
#endif
static constexpr const int LOG_EVENT_LEN = 20;
static constexpr const int LOG_BUFFER_LEN = 30;
static constexpr const int LOG_SMALL_BUFFER_LEN = 10;
static constexpr const int LOG_INDEX_LEN = 5;
static int log_depth; // Not threadsafe. Log only.
// Helper to turn unprintable or newline characters into spaces
static simdjson_inline char printable_char(char c) {
if (c >= 0x20) {
return c;
} else {
return ' ';
}
}
// Print the header and set up log_start
static simdjson_inline void log_start() {
if (LOG_ENABLED) {
log_depth = 0;
printf("\n");
printf("| %-*s | %-*s | %-*s | %-*s | Detail |\n", LOG_EVENT_LEN, "Event", LOG_BUFFER_LEN, "Buffer", LOG_SMALL_BUFFER_LEN, "Next", 5, "Next#");
printf("|%.*s|%.*s|%.*s|%.*s|--------|\n", LOG_EVENT_LEN+2, DASHES, LOG_BUFFER_LEN+2, DASHES, LOG_SMALL_BUFFER_LEN+2, DASHES, 5+2, DASHES);
}
}
simdjson_unused static simdjson_inline void log_string(const char *message) {
if (LOG_ENABLED) {
printf("%s\n", message);
}
}
// Logs a single line from the stage 2 DOM parser
template<typename S>
static simdjson_inline void log_line(S &structurals, const char *title_prefix, const char *title, const char *detail) {
if (LOG_ENABLED) {
printf("| %*s%s%-*s ", log_depth*2, "", title_prefix, LOG_EVENT_LEN - log_depth*2 - int(strlen(title_prefix)), title);
auto current_index = structurals.at_beginning() ? nullptr : structurals.next_structural-1;
auto next_index = structurals.next_structural;
auto current = current_index ? &structurals.buf[*current_index] : reinterpret_cast<const uint8_t*>(" ");
auto next = &structurals.buf[*next_index];
{
// Print the next N characters in the buffer.
printf("| ");
// Otherwise, print the characters starting from the buffer position.
// Print spaces for unprintable or newline characters.
for (int i=0;i<LOG_BUFFER_LEN;i++) {
printf("%c", printable_char(current[i]));
}
printf(" ");
// Print the next N characters in the buffer.
printf("| ");
// Otherwise, print the characters starting from the buffer position.
// Print spaces for unprintable or newline characters.
for (int i=0;i<LOG_SMALL_BUFFER_LEN;i++) {
printf("%c", printable_char(next[i]));
}
printf(" ");
}
if (current_index) {
printf("| %*u ", LOG_INDEX_LEN, *current_index);
} else {
printf("| %-*s ", LOG_INDEX_LEN, "");
}
// printf("| %*u ", LOG_INDEX_LEN, structurals.next_tape_index());
printf("| %-s ", detail);
printf("|\n");
}
}
} // namespace logger
} // unnamed namespace
} // namespace ppc64
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE2_LOGGER_H
/* end file generic/stage2/logger.h for ppc64 */
// All other declarations
/* including generic/stage2/json_iterator.h for ppc64: #include <generic/stage2/json_iterator.h> */
/* begin file generic/stage2/json_iterator.h for ppc64 */
#ifndef SIMDJSON_SRC_GENERIC_STAGE2_JSON_ITERATOR_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE2_JSON_ITERATOR_H */
/* amalgamation skipped (editor-only): #include <generic/stage2/base.h> */
/* amalgamation skipped (editor-only): #include <generic/stage2/logger.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/dom_parser_implementation.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace ppc64 {
namespace {
namespace stage2 {
class json_iterator {
public:
const uint8_t* const buf;
uint32_t *next_structural;
dom_parser_implementation &dom_parser;
uint32_t depth{0};
/**
* Walk the JSON document.
*
* The visitor receives callbacks when values are encountered. All callbacks pass the iterator as
* the first parameter; some callbacks have other parameters as well:
*
* - visit_document_start() - at the beginning.
* - visit_document_end() - at the end (if things were successful).
*
* - visit_array_start() - at the start `[` of a non-empty array.
* - visit_array_end() - at the end `]` of a non-empty array.
* - visit_empty_array() - when an empty array is encountered.
*
* - visit_object_end() - at the start `]` of a non-empty object.
* - visit_object_start() - at the end `]` of a non-empty object.
* - visit_empty_object() - when an empty object is encountered.
* - visit_key(const uint8_t *key) - when a key in an object field is encountered. key is
* guaranteed to point at the first quote of the string (`"key"`).
* - visit_primitive(const uint8_t *value) - when a value is a string, number, boolean or null.
* - visit_root_primitive(iter, uint8_t *value) - when the top-level value is a string, number, boolean or null.
*
* - increment_count(iter) - each time a value is found in an array or object.
*/
template<bool STREAMING, typename V>
simdjson_warn_unused simdjson_inline error_code walk_document(V &visitor) noexcept;
/**
* Create an iterator capable of walking a JSON document.
*
* The document must have already passed through stage 1.
*/
simdjson_inline json_iterator(dom_parser_implementation &_dom_parser, size_t start_structural_index);
/**
* Look at the next token.
*
* Tokens can be strings, numbers, booleans, null, or operators (`[{]},:`)).
*
* They may include invalid JSON as well (such as `1.2.3` or `ture`).
*/
simdjson_inline const uint8_t *peek() const noexcept;
/**
* Advance to the next token.
*
* Tokens can be strings, numbers, booleans, null, or operators (`[{]},:`)).
*
* They may include invalid JSON as well (such as `1.2.3` or `ture`).
*/
simdjson_inline const uint8_t *advance() noexcept;
/**
* Get the remaining length of the document, from the start of the current token.
*/
simdjson_inline size_t remaining_len() const noexcept;
/**
* Check if we are at the end of the document.
*
* If this is true, there are no more tokens.
*/
simdjson_inline bool at_eof() const noexcept;
/**
* Check if we are at the beginning of the document.
*/
simdjson_inline bool at_beginning() const noexcept;
simdjson_inline uint8_t last_structural() const noexcept;
/**
* Log that a value has been found.
*
* Set LOG_ENABLED=true in logger.h to see logging.
*/
simdjson_inline void log_value(const char *type) const noexcept;
/**
* Log the start of a multipart value.
*
* Set LOG_ENABLED=true in logger.h to see logging.
*/
simdjson_inline void log_start_value(const char *type) const noexcept;
/**
* Log the end of a multipart value.
*
* Set LOG_ENABLED=true in logger.h to see logging.
*/
simdjson_inline void log_end_value(const char *type) const noexcept;
/**
* Log an error.
*
* Set LOG_ENABLED=true in logger.h to see logging.
*/
simdjson_inline void log_error(const char *error) const noexcept;
template<typename V>
simdjson_warn_unused simdjson_inline error_code visit_root_primitive(V &visitor, const uint8_t *value) noexcept;
template<typename V>
simdjson_warn_unused simdjson_inline error_code visit_primitive(V &visitor, const uint8_t *value) noexcept;
};
template<bool STREAMING, typename V>
simdjson_warn_unused simdjson_inline error_code json_iterator::walk_document(V &visitor) noexcept {
logger::log_start();
//
// Start the document
//
if (at_eof()) { return EMPTY; }
log_start_value("document");
SIMDJSON_TRY( visitor.visit_document_start(*this) );
//
// Read first value
//
{
auto value = advance();
// Make sure the outer object or array is closed before continuing; otherwise, there are ways we
// could get into memory corruption. See https://github.com/simdjson/simdjson/issues/906
if (!STREAMING) {
switch (*value) {
case '{': if (last_structural() != '}') { log_value("starting brace unmatched"); return TAPE_ERROR; }; break;
case '[': if (last_structural() != ']') { log_value("starting bracket unmatched"); return TAPE_ERROR; }; break;
}
}
switch (*value) {
case '{': if (*peek() == '}') { advance(); log_value("empty object"); SIMDJSON_TRY( visitor.visit_empty_object(*this) ); break; } goto object_begin;
case '[': if (*peek() == ']') { advance(); log_value("empty array"); SIMDJSON_TRY( visitor.visit_empty_array(*this) ); break; } goto array_begin;
default: SIMDJSON_TRY( visitor.visit_root_primitive(*this, value) ); break;
}
}
goto document_end;
//
// Object parser states
//
object_begin:
log_start_value("object");
depth++;
if (depth >= dom_parser.max_depth()) { log_error("Exceeded max depth!"); return DEPTH_ERROR; }
dom_parser.is_array[depth] = false;
SIMDJSON_TRY( visitor.visit_object_start(*this) );
{
auto key = advance();
if (*key != '"') { log_error("Object does not start with a key"); return TAPE_ERROR; }
SIMDJSON_TRY( visitor.increment_count(*this) );
SIMDJSON_TRY( visitor.visit_key(*this, key) );
}
object_field:
if (simdjson_unlikely( *advance() != ':' )) { log_error("Missing colon after key in object"); return TAPE_ERROR; }
{
auto value = advance();
switch (*value) {
case '{': if (*peek() == '}') { advance(); log_value("empty object"); SIMDJSON_TRY( visitor.visit_empty_object(*this) ); break; } goto object_begin;
case '[': if (*peek() == ']') { advance(); log_value("empty array"); SIMDJSON_TRY( visitor.visit_empty_array(*this) ); break; } goto array_begin;
default: SIMDJSON_TRY( visitor.visit_primitive(*this, value) ); break;
}
}
object_continue:
switch (*advance()) {
case ',':
SIMDJSON_TRY( visitor.increment_count(*this) );
{
auto key = advance();
if (simdjson_unlikely( *key != '"' )) { log_error("Key string missing at beginning of field in object"); return TAPE_ERROR; }
SIMDJSON_TRY( visitor.visit_key(*this, key) );
}
goto object_field;
case '}': log_end_value("object"); SIMDJSON_TRY( visitor.visit_object_end(*this) ); goto scope_end;
default: log_error("No comma between object fields"); return TAPE_ERROR;
}
scope_end:
depth--;
if (depth == 0) { goto document_end; }
if (dom_parser.is_array[depth]) { goto array_continue; }
goto object_continue;
//
// Array parser states
//
array_begin:
log_start_value("array");
depth++;
if (depth >= dom_parser.max_depth()) { log_error("Exceeded max depth!"); return DEPTH_ERROR; }
dom_parser.is_array[depth] = true;
SIMDJSON_TRY( visitor.visit_array_start(*this) );
SIMDJSON_TRY( visitor.increment_count(*this) );
array_value:
{
auto value = advance();
switch (*value) {
case '{': if (*peek() == '}') { advance(); log_value("empty object"); SIMDJSON_TRY( visitor.visit_empty_object(*this) ); break; } goto object_begin;
case '[': if (*peek() == ']') { advance(); log_value("empty array"); SIMDJSON_TRY( visitor.visit_empty_array(*this) ); break; } goto array_begin;
default: SIMDJSON_TRY( visitor.visit_primitive(*this, value) ); break;
}
}
array_continue:
switch (*advance()) {
case ',': SIMDJSON_TRY( visitor.increment_count(*this) ); goto array_value;
case ']': log_end_value("array"); SIMDJSON_TRY( visitor.visit_array_end(*this) ); goto scope_end;
default: log_error("Missing comma between array values"); return TAPE_ERROR;
}
document_end:
log_end_value("document");
SIMDJSON_TRY( visitor.visit_document_end(*this) );
dom_parser.next_structural_index = uint32_t(next_structural - &dom_parser.structural_indexes[0]);
// If we didn't make it to the end, it's an error
if ( !STREAMING && dom_parser.next_structural_index != dom_parser.n_structural_indexes ) {
log_error("More than one JSON value at the root of the document, or extra characters at the end of the JSON!");
return TAPE_ERROR;
}
return SUCCESS;
} // walk_document()
simdjson_inline json_iterator::json_iterator(dom_parser_implementation &_dom_parser, size_t start_structural_index)
: buf{_dom_parser.buf},
next_structural{&_dom_parser.structural_indexes[start_structural_index]},
dom_parser{_dom_parser} {
}
simdjson_inline const uint8_t *json_iterator::peek() const noexcept {
return &buf[*(next_structural)];
}
simdjson_inline const uint8_t *json_iterator::advance() noexcept {
return &buf[*(next_structural++)];
}
simdjson_inline size_t json_iterator::remaining_len() const noexcept {
return dom_parser.len - *(next_structural-1);
}
simdjson_inline bool json_iterator::at_eof() const noexcept {
return next_structural == &dom_parser.structural_indexes[dom_parser.n_structural_indexes];
}
simdjson_inline bool json_iterator::at_beginning() const noexcept {
return next_structural == dom_parser.structural_indexes.get();
}
simdjson_inline uint8_t json_iterator::last_structural() const noexcept {
return buf[dom_parser.structural_indexes[dom_parser.n_structural_indexes - 1]];
}
simdjson_inline void json_iterator::log_value(const char *type) const noexcept {
logger::log_line(*this, "", type, "");
}
simdjson_inline void json_iterator::log_start_value(const char *type) const noexcept {
logger::log_line(*this, "+", type, "");
if (logger::LOG_ENABLED) { logger::log_depth++; }
}
simdjson_inline void json_iterator::log_end_value(const char *type) const noexcept {
if (logger::LOG_ENABLED) { logger::log_depth--; }
logger::log_line(*this, "-", type, "");
}
simdjson_inline void json_iterator::log_error(const char *error) const noexcept {
logger::log_line(*this, "", "ERROR", error);
}
template<typename V>
simdjson_warn_unused simdjson_inline error_code json_iterator::visit_root_primitive(V &visitor, const uint8_t *value) noexcept {
switch (*value) {
case '"': return visitor.visit_root_string(*this, value);
case 't': return visitor.visit_root_true_atom(*this, value);
case 'f': return visitor.visit_root_false_atom(*this, value);
case 'n': return visitor.visit_root_null_atom(*this, value);
case '-':
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
return visitor.visit_root_number(*this, value);
default:
log_error("Document starts with a non-value character");
return TAPE_ERROR;
}
}
template<typename V>
simdjson_warn_unused simdjson_inline error_code json_iterator::visit_primitive(V &visitor, const uint8_t *value) noexcept {
// Use the fact that most scalars are going to be either strings or numbers.
if(*value == '"') {
return visitor.visit_string(*this, value);
} else if (((*value - '0') < 10) || (*value == '-')) {
return visitor.visit_number(*this, value);
}
// true, false, null are uncommon.
switch (*value) {
case 't': return visitor.visit_true_atom(*this, value);
case 'f': return visitor.visit_false_atom(*this, value);
case 'n': return visitor.visit_null_atom(*this, value);
default:
log_error("Non-value found when value was expected!");
return TAPE_ERROR;
}
}
} // namespace stage2
} // unnamed namespace
} // namespace ppc64
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE2_JSON_ITERATOR_H
/* end file generic/stage2/json_iterator.h for ppc64 */
/* including generic/stage2/stringparsing.h for ppc64: #include <generic/stage2/stringparsing.h> */
/* begin file generic/stage2/stringparsing.h for ppc64 */
#ifndef SIMDJSON_SRC_GENERIC_STAGE2_STRINGPARSING_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE2_STRINGPARSING_H */
/* amalgamation skipped (editor-only): #include <generic/stage2/base.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/jsoncharutils.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
// This file contains the common code every implementation uses
// It is intended to be included multiple times and compiled multiple times
namespace simdjson {
namespace ppc64 {
namespace {
/// @private
namespace stringparsing {
// begin copypasta
// These chars yield themselves: " \ /
// b -> backspace, f -> formfeed, n -> newline, r -> cr, t -> horizontal tab
// u not handled in this table as it's complex
static const uint8_t escape_map[256] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x0.
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0x22, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x2f,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x4.
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x5c, 0, 0, 0, // 0x5.
0, 0, 0x08, 0, 0, 0, 0x0c, 0, 0, 0, 0, 0, 0, 0, 0x0a, 0, // 0x6.
0, 0, 0x0d, 0, 0x09, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x7.
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
};
// handle a unicode codepoint
// write appropriate values into dest
// src will advance 6 bytes or 12 bytes
// dest will advance a variable amount (return via pointer)
// return true if the unicode codepoint was valid
// We work in little-endian then swap at write time
simdjson_warn_unused
simdjson_inline bool handle_unicode_codepoint(const uint8_t **src_ptr,
uint8_t **dst_ptr, bool allow_replacement) {
// Use the default Unicode Character 'REPLACEMENT CHARACTER' (U+FFFD)
constexpr uint32_t substitution_code_point = 0xfffd;
// jsoncharutils::hex_to_u32_nocheck fills high 16 bits of the return value with 1s if the
// conversion is not valid; we defer the check for this to inside the
// multilingual plane check.
uint32_t code_point = jsoncharutils::hex_to_u32_nocheck(*src_ptr + 2);
*src_ptr += 6;
// If we found a high surrogate, we must
// check for low surrogate for characters
// outside the Basic
// Multilingual Plane.
if (code_point >= 0xd800 && code_point < 0xdc00) {
const uint8_t *src_data = *src_ptr;
/* Compiler optimizations convert this to a single 16-bit load and compare on most platforms */
if (((src_data[0] << 8) | src_data[1]) != ((static_cast<uint8_t> ('\\') << 8) | static_cast<uint8_t> ('u'))) {
if(!allow_replacement) { return false; }
code_point = substitution_code_point;
} else {
uint32_t code_point_2 = jsoncharutils::hex_to_u32_nocheck(src_data + 2);
// We have already checked that the high surrogate is valid and
// (code_point - 0xd800) < 1024.
//
// Check that code_point_2 is in the range 0xdc00..0xdfff
// and that code_point_2 was parsed from valid hex.
uint32_t low_bit = code_point_2 - 0xdc00;
if (low_bit >> 10) {
if(!allow_replacement) { return false; }
code_point = substitution_code_point;
} else {
code_point = (((code_point - 0xd800) << 10) | low_bit) + 0x10000;
*src_ptr += 6;
}
}
} else if (code_point >= 0xdc00 && code_point <= 0xdfff) {
// If we encounter a low surrogate (not preceded by a high surrogate)
// then we have an error.
if(!allow_replacement) { return false; }
code_point = substitution_code_point;
}
size_t offset = jsoncharutils::codepoint_to_utf8(code_point, *dst_ptr);
*dst_ptr += offset;
return offset > 0;
}
// handle a unicode codepoint using the wobbly convention
// https://simonsapin.github.io/wtf-8/
// write appropriate values into dest
// src will advance 6 bytes or 12 bytes
// dest will advance a variable amount (return via pointer)
// return true if the unicode codepoint was valid
// We work in little-endian then swap at write time
simdjson_warn_unused
simdjson_inline bool handle_unicode_codepoint_wobbly(const uint8_t **src_ptr,
uint8_t **dst_ptr) {
// It is not ideal that this function is nearly identical to handle_unicode_codepoint.
//
// jsoncharutils::hex_to_u32_nocheck fills high 16 bits of the return value with 1s if the
// conversion is not valid; we defer the check for this to inside the
// multilingual plane check.
uint32_t code_point = jsoncharutils::hex_to_u32_nocheck(*src_ptr + 2);
*src_ptr += 6;
// If we found a high surrogate, we must
// check for low surrogate for characters
// outside the Basic
// Multilingual Plane.
if (code_point >= 0xd800 && code_point < 0xdc00) {
const uint8_t *src_data = *src_ptr;
/* Compiler optimizations convert this to a single 16-bit load and compare on most platforms */
if (((src_data[0] << 8) | src_data[1]) == ((static_cast<uint8_t> ('\\') << 8) | static_cast<uint8_t> ('u'))) {
uint32_t code_point_2 = jsoncharutils::hex_to_u32_nocheck(src_data + 2);
uint32_t low_bit = code_point_2 - 0xdc00;
if ((low_bit >> 10) == 0) {
code_point =
(((code_point - 0xd800) << 10) | low_bit) + 0x10000;
*src_ptr += 6;
}
}
}
size_t offset = jsoncharutils::codepoint_to_utf8(code_point, *dst_ptr);
*dst_ptr += offset;
return offset > 0;
}
/**
* Unescape a valid UTF-8 string from src to dst, stopping at a final unescaped quote. There
* must be an unescaped quote terminating the string. It returns the final output
* position as pointer. In case of error (e.g., the string has bad escaped codes),
* then null_nullptrptr is returned. It is assumed that the output buffer is large
* enough. E.g., if src points at 'joe"', then dst needs to have four free bytes +
* SIMDJSON_PADDING bytes.
*/
simdjson_warn_unused simdjson_inline uint8_t *parse_string(const uint8_t *src, uint8_t *dst, bool allow_replacement) {
while (1) {
// Copy the next n bytes, and find the backslash and quote in them.
auto bs_quote = backslash_and_quote::copy_and_find(src, dst);
// If the next thing is the end quote, copy and return
if (bs_quote.has_quote_first()) {
// we encountered quotes first. Move dst to point to quotes and exit
return dst + bs_quote.quote_index();
}
if (bs_quote.has_backslash()) {
/* find out where the backspace is */
auto bs_dist = bs_quote.backslash_index();
uint8_t escape_char = src[bs_dist + 1];
/* we encountered backslash first. Handle backslash */
if (escape_char == 'u') {
/* move src/dst up to the start; they will be further adjusted
within the unicode codepoint handling code. */
src += bs_dist;
dst += bs_dist;
if (!handle_unicode_codepoint(&src, &dst, allow_replacement)) {
return nullptr;
}
} else {
/* simple 1:1 conversion. Will eat bs_dist+2 characters in input and
* write bs_dist+1 characters to output
* note this may reach beyond the part of the buffer we've actually
* seen. I think this is ok */
uint8_t escape_result = escape_map[escape_char];
if (escape_result == 0u) {
return nullptr; /* bogus escape value is an error */
}
dst[bs_dist] = escape_result;
src += bs_dist + 2;
dst += bs_dist + 1;
}
} else {
/* they are the same. Since they can't co-occur, it means we
* encountered neither. */
src += backslash_and_quote::BYTES_PROCESSED;
dst += backslash_and_quote::BYTES_PROCESSED;
}
}
}
simdjson_warn_unused simdjson_inline uint8_t *parse_wobbly_string(const uint8_t *src, uint8_t *dst) {
// It is not ideal that this function is nearly identical to parse_string.
while (1) {
// Copy the next n bytes, and find the backslash and quote in them.
auto bs_quote = backslash_and_quote::copy_and_find(src, dst);
// If the next thing is the end quote, copy and return
if (bs_quote.has_quote_first()) {
// we encountered quotes first. Move dst to point to quotes and exit
return dst + bs_quote.quote_index();
}
if (bs_quote.has_backslash()) {
/* find out where the backspace is */
auto bs_dist = bs_quote.backslash_index();
uint8_t escape_char = src[bs_dist + 1];
/* we encountered backslash first. Handle backslash */
if (escape_char == 'u') {
/* move src/dst up to the start; they will be further adjusted
within the unicode codepoint handling code. */
src += bs_dist;
dst += bs_dist;
if (!handle_unicode_codepoint_wobbly(&src, &dst)) {
return nullptr;
}
} else {
/* simple 1:1 conversion. Will eat bs_dist+2 characters in input and
* write bs_dist+1 characters to output
* note this may reach beyond the part of the buffer we've actually
* seen. I think this is ok */
uint8_t escape_result = escape_map[escape_char];
if (escape_result == 0u) {
return nullptr; /* bogus escape value is an error */
}
dst[bs_dist] = escape_result;
src += bs_dist + 2;
dst += bs_dist + 1;
}
} else {
/* they are the same. Since they can't co-occur, it means we
* encountered neither. */
src += backslash_and_quote::BYTES_PROCESSED;
dst += backslash_and_quote::BYTES_PROCESSED;
}
}
}
} // namespace stringparsing
} // unnamed namespace
} // namespace ppc64
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE2_STRINGPARSING_H
/* end file generic/stage2/stringparsing.h for ppc64 */
/* including generic/stage2/structural_iterator.h for ppc64: #include <generic/stage2/structural_iterator.h> */
/* begin file generic/stage2/structural_iterator.h for ppc64 */
#ifndef SIMDJSON_SRC_GENERIC_STAGE2_STRUCTURAL_ITERATOR_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE2_STRUCTURAL_ITERATOR_H */
/* amalgamation skipped (editor-only): #include <generic/stage2/base.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/dom_parser_implementation.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace ppc64 {
namespace {
namespace stage2 {
class structural_iterator {
public:
const uint8_t* const buf;
uint32_t *next_structural;
dom_parser_implementation &dom_parser;
// Start a structural
simdjson_inline structural_iterator(dom_parser_implementation &_dom_parser, size_t start_structural_index)
: buf{_dom_parser.buf},
next_structural{&_dom_parser.structural_indexes[start_structural_index]},
dom_parser{_dom_parser} {
}
// Get the buffer position of the current structural character
simdjson_inline const uint8_t* current() {
return &buf[*(next_structural-1)];
}
// Get the current structural character
simdjson_inline char current_char() {
return buf[*(next_structural-1)];
}
// Get the next structural character without advancing
simdjson_inline char peek_next_char() {
return buf[*next_structural];
}
simdjson_inline const uint8_t* peek() {
return &buf[*next_structural];
}
simdjson_inline const uint8_t* advance() {
return &buf[*(next_structural++)];
}
simdjson_inline char advance_char() {
return buf[*(next_structural++)];
}
simdjson_inline size_t remaining_len() {
return dom_parser.len - *(next_structural-1);
}
simdjson_inline bool at_end() {
return next_structural == &dom_parser.structural_indexes[dom_parser.n_structural_indexes];
}
simdjson_inline bool at_beginning() {
return next_structural == dom_parser.structural_indexes.get();
}
};
} // namespace stage2
} // unnamed namespace
} // namespace ppc64
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE2_STRUCTURAL_ITERATOR_H
/* end file generic/stage2/structural_iterator.h for ppc64 */
/* including generic/stage2/tape_builder.h for ppc64: #include <generic/stage2/tape_builder.h> */
/* begin file generic/stage2/tape_builder.h for ppc64 */
#ifndef SIMDJSON_SRC_GENERIC_STAGE2_TAPE_BUILDER_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE2_TAPE_BUILDER_H */
/* amalgamation skipped (editor-only): #include <generic/stage2/base.h> */
/* amalgamation skipped (editor-only): #include <generic/stage2/json_iterator.h> */
/* amalgamation skipped (editor-only): #include <generic/stage2/stringparsing.h> */
/* amalgamation skipped (editor-only): #include <generic/stage2/tape_writer.h> */
/* amalgamation skipped (editor-only): #include <simdjson/dom/document.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/atomparsing.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/dom_parser_implementation.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/numberparsing.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace ppc64 {
namespace {
namespace stage2 {
struct tape_builder {
template<bool STREAMING>
simdjson_warn_unused static simdjson_inline error_code parse_document(
dom_parser_implementation &dom_parser,
dom::document &doc) noexcept;
/** Called when a non-empty document starts. */
simdjson_warn_unused simdjson_inline error_code visit_document_start(json_iterator &iter) noexcept;
/** Called when a non-empty document ends without error. */
simdjson_warn_unused simdjson_inline error_code visit_document_end(json_iterator &iter) noexcept;
/** Called when a non-empty array starts. */
simdjson_warn_unused simdjson_inline error_code visit_array_start(json_iterator &iter) noexcept;
/** Called when a non-empty array ends. */
simdjson_warn_unused simdjson_inline error_code visit_array_end(json_iterator &iter) noexcept;
/** Called when an empty array is found. */
simdjson_warn_unused simdjson_inline error_code visit_empty_array(json_iterator &iter) noexcept;
/** Called when a non-empty object starts. */
simdjson_warn_unused simdjson_inline error_code visit_object_start(json_iterator &iter) noexcept;
/**
* Called when a key in a field is encountered.
*
* primitive, visit_object_start, visit_empty_object, visit_array_start, or visit_empty_array
* will be called after this with the field value.
*/
simdjson_warn_unused simdjson_inline error_code visit_key(json_iterator &iter, const uint8_t *key) noexcept;
/** Called when a non-empty object ends. */
simdjson_warn_unused simdjson_inline error_code visit_object_end(json_iterator &iter) noexcept;
/** Called when an empty object is found. */
simdjson_warn_unused simdjson_inline error_code visit_empty_object(json_iterator &iter) noexcept;
/**
* Called when a string, number, boolean or null is found.
*/
simdjson_warn_unused simdjson_inline error_code visit_primitive(json_iterator &iter, const uint8_t *value) noexcept;
/**
* Called when a string, number, boolean or null is found at the top level of a document (i.e.
* when there is no array or object and the entire document is a single string, number, boolean or
* null.
*
* This is separate from primitive() because simdjson's normal primitive parsing routines assume
* there is at least one more token after the value, which is only true in an array or object.
*/
simdjson_warn_unused simdjson_inline error_code visit_root_primitive(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_string(json_iterator &iter, const uint8_t *value, bool key = false) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_number(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_true_atom(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_false_atom(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_null_atom(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_root_string(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_root_number(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_root_true_atom(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_root_false_atom(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_root_null_atom(json_iterator &iter, const uint8_t *value) noexcept;
/** Called each time a new field or element in an array or object is found. */
simdjson_warn_unused simdjson_inline error_code increment_count(json_iterator &iter) noexcept;
/** Next location to write to tape */
tape_writer tape;
private:
/** Next write location in the string buf for stage 2 parsing */
uint8_t *current_string_buf_loc;
simdjson_inline tape_builder(dom::document &doc) noexcept;
simdjson_inline uint32_t next_tape_index(json_iterator &iter) const noexcept;
simdjson_inline void start_container(json_iterator &iter) noexcept;
simdjson_warn_unused simdjson_inline error_code end_container(json_iterator &iter, internal::tape_type start, internal::tape_type end) noexcept;
simdjson_warn_unused simdjson_inline error_code empty_container(json_iterator &iter, internal::tape_type start, internal::tape_type end) noexcept;
simdjson_inline uint8_t *on_start_string(json_iterator &iter) noexcept;
simdjson_inline void on_end_string(uint8_t *dst) noexcept;
}; // struct tape_builder
template<bool STREAMING>
simdjson_warn_unused simdjson_inline error_code tape_builder::parse_document(
dom_parser_implementation &dom_parser,
dom::document &doc) noexcept {
dom_parser.doc = &doc;
json_iterator iter(dom_parser, STREAMING ? dom_parser.next_structural_index : 0);
tape_builder builder(doc);
return iter.walk_document<STREAMING>(builder);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_root_primitive(json_iterator &iter, const uint8_t *value) noexcept {
return iter.visit_root_primitive(*this, value);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_primitive(json_iterator &iter, const uint8_t *value) noexcept {
return iter.visit_primitive(*this, value);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_empty_object(json_iterator &iter) noexcept {
return empty_container(iter, internal::tape_type::START_OBJECT, internal::tape_type::END_OBJECT);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_empty_array(json_iterator &iter) noexcept {
return empty_container(iter, internal::tape_type::START_ARRAY, internal::tape_type::END_ARRAY);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_document_start(json_iterator &iter) noexcept {
start_container(iter);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_object_start(json_iterator &iter) noexcept {
start_container(iter);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_array_start(json_iterator &iter) noexcept {
start_container(iter);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_object_end(json_iterator &iter) noexcept {
return end_container(iter, internal::tape_type::START_OBJECT, internal::tape_type::END_OBJECT);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_array_end(json_iterator &iter) noexcept {
return end_container(iter, internal::tape_type::START_ARRAY, internal::tape_type::END_ARRAY);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_document_end(json_iterator &iter) noexcept {
constexpr uint32_t start_tape_index = 0;
tape.append(start_tape_index, internal::tape_type::ROOT);
tape_writer::write(iter.dom_parser.doc->tape[start_tape_index], next_tape_index(iter), internal::tape_type::ROOT);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_key(json_iterator &iter, const uint8_t *key) noexcept {
return visit_string(iter, key, true);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::increment_count(json_iterator &iter) noexcept {
iter.dom_parser.open_containers[iter.depth].count++; // we have a key value pair in the object at parser.dom_parser.depth - 1
return SUCCESS;
}
simdjson_inline tape_builder::tape_builder(dom::document &doc) noexcept : tape{doc.tape.get()}, current_string_buf_loc{doc.string_buf.get()} {}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_string(json_iterator &iter, const uint8_t *value, bool key) noexcept {
iter.log_value(key ? "key" : "string");
uint8_t *dst = on_start_string(iter);
dst = stringparsing::parse_string(value+1, dst, false); // We do not allow replacement when the escape characters are invalid.
if (dst == nullptr) {
iter.log_error("Invalid escape in string");
return STRING_ERROR;
}
on_end_string(dst);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_root_string(json_iterator &iter, const uint8_t *value) noexcept {
return visit_string(iter, value);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_number(json_iterator &iter, const uint8_t *value) noexcept {
iter.log_value("number");
return numberparsing::parse_number(value, tape);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_root_number(json_iterator &iter, const uint8_t *value) noexcept {
//
// We need to make a copy to make sure that the string is space terminated.
// This is not about padding the input, which should already padded up
// to len + SIMDJSON_PADDING. However, we have no control at this stage
// on how the padding was done. What if the input string was padded with nulls?
// It is quite common for an input string to have an extra null character (C string).
// We do not want to allow 9\0 (where \0 is the null character) inside a JSON
// document, but the string "9\0" by itself is fine. So we make a copy and
// pad the input with spaces when we know that there is just one input element.
// This copy is relatively expensive, but it will almost never be called in
// practice unless you are in the strange scenario where you have many JSON
// documents made of single atoms.
//
std::unique_ptr<uint8_t[]>copy(new (std::nothrow) uint8_t[iter.remaining_len() + SIMDJSON_PADDING]);
if (copy.get() == nullptr) { return MEMALLOC; }
std::memcpy(copy.get(), value, iter.remaining_len());
std::memset(copy.get() + iter.remaining_len(), ' ', SIMDJSON_PADDING);
error_code error = visit_number(iter, copy.get());
return error;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_true_atom(json_iterator &iter, const uint8_t *value) noexcept {
iter.log_value("true");
if (!atomparsing::is_valid_true_atom(value)) { return T_ATOM_ERROR; }
tape.append(0, internal::tape_type::TRUE_VALUE);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_root_true_atom(json_iterator &iter, const uint8_t *value) noexcept {
iter.log_value("true");
if (!atomparsing::is_valid_true_atom(value, iter.remaining_len())) { return T_ATOM_ERROR; }
tape.append(0, internal::tape_type::TRUE_VALUE);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_false_atom(json_iterator &iter, const uint8_t *value) noexcept {
iter.log_value("false");
if (!atomparsing::is_valid_false_atom(value)) { return F_ATOM_ERROR; }
tape.append(0, internal::tape_type::FALSE_VALUE);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_root_false_atom(json_iterator &iter, const uint8_t *value) noexcept {
iter.log_value("false");
if (!atomparsing::is_valid_false_atom(value, iter.remaining_len())) { return F_ATOM_ERROR; }
tape.append(0, internal::tape_type::FALSE_VALUE);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_null_atom(json_iterator &iter, const uint8_t *value) noexcept {
iter.log_value("null");
if (!atomparsing::is_valid_null_atom(value)) { return N_ATOM_ERROR; }
tape.append(0, internal::tape_type::NULL_VALUE);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_root_null_atom(json_iterator &iter, const uint8_t *value) noexcept {
iter.log_value("null");
if (!atomparsing::is_valid_null_atom(value, iter.remaining_len())) { return N_ATOM_ERROR; }
tape.append(0, internal::tape_type::NULL_VALUE);
return SUCCESS;
}
// private:
simdjson_inline uint32_t tape_builder::next_tape_index(json_iterator &iter) const noexcept {
return uint32_t(tape.next_tape_loc - iter.dom_parser.doc->tape.get());
}
simdjson_warn_unused simdjson_inline error_code tape_builder::empty_container(json_iterator &iter, internal::tape_type start, internal::tape_type end) noexcept {
auto start_index = next_tape_index(iter);
tape.append(start_index+2, start);
tape.append(start_index, end);
return SUCCESS;
}
simdjson_inline void tape_builder::start_container(json_iterator &iter) noexcept {
iter.dom_parser.open_containers[iter.depth].tape_index = next_tape_index(iter);
iter.dom_parser.open_containers[iter.depth].count = 0;
tape.skip(); // We don't actually *write* the start element until the end.
}
simdjson_warn_unused simdjson_inline error_code tape_builder::end_container(json_iterator &iter, internal::tape_type start, internal::tape_type end) noexcept {
// Write the ending tape element, pointing at the start location
const uint32_t start_tape_index = iter.dom_parser.open_containers[iter.depth].tape_index;
tape.append(start_tape_index, end);
// Write the start tape element, pointing at the end location (and including count)
// count can overflow if it exceeds 24 bits... so we saturate
// the convention being that a cnt of 0xffffff or more is undetermined in value (>= 0xffffff).
const uint32_t count = iter.dom_parser.open_containers[iter.depth].count;
const uint32_t cntsat = count > 0xFFFFFF ? 0xFFFFFF : count;
tape_writer::write(iter.dom_parser.doc->tape[start_tape_index], next_tape_index(iter) | (uint64_t(cntsat) << 32), start);
return SUCCESS;
}
simdjson_inline uint8_t *tape_builder::on_start_string(json_iterator &iter) noexcept {
// we advance the point, accounting for the fact that we have a NULL termination
tape.append(current_string_buf_loc - iter.dom_parser.doc->string_buf.get(), internal::tape_type::STRING);
return current_string_buf_loc + sizeof(uint32_t);
}
simdjson_inline void tape_builder::on_end_string(uint8_t *dst) noexcept {
uint32_t str_length = uint32_t(dst - (current_string_buf_loc + sizeof(uint32_t)));
// TODO check for overflow in case someone has a crazy string (>=4GB?)
// But only add the overflow check when the document itself exceeds 4GB
// Currently unneeded because we refuse to parse docs larger or equal to 4GB.
memcpy(current_string_buf_loc, &str_length, sizeof(uint32_t));
// NULL termination is still handy if you expect all your strings to
// be NULL terminated? It comes at a small cost
*dst = 0;
current_string_buf_loc = dst + 1;
}
} // namespace stage2
} // unnamed namespace
} // namespace ppc64
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE2_TAPE_BUILDER_H
/* end file generic/stage2/tape_builder.h for ppc64 */
/* end file generic/stage2/amalgamated.h for ppc64 */
//
// Stage 1
//
namespace simdjson {
namespace ppc64 {
simdjson_warn_unused error_code implementation::create_dom_parser_implementation(
size_t capacity,
size_t max_depth,
std::unique_ptr<internal::dom_parser_implementation>& dst
) const noexcept {
dst.reset( new (std::nothrow) dom_parser_implementation() );
if (!dst) { return MEMALLOC; }
if (auto err = dst->set_capacity(capacity))
return err;
if (auto err = dst->set_max_depth(max_depth))
return err;
return SUCCESS;
}
namespace {
using namespace simd;
simdjson_inline json_character_block json_character_block::classify(const simd::simd8x64<uint8_t>& in) {
const simd8<uint8_t> table1(16, 0, 0, 0, 0, 0, 0, 0, 0, 8, 12, 1, 2, 9, 0, 0);
const simd8<uint8_t> table2(8, 0, 18, 4, 0, 1, 0, 1, 0, 0, 0, 3, 2, 1, 0, 0);
simd8x64<uint8_t> v(
(in.chunks[0] & 0xf).lookup_16(table1) & (in.chunks[0].shr<4>()).lookup_16(table2),
(in.chunks[1] & 0xf).lookup_16(table1) & (in.chunks[1].shr<4>()).lookup_16(table2),
(in.chunks[2] & 0xf).lookup_16(table1) & (in.chunks[2].shr<4>()).lookup_16(table2),
(in.chunks[3] & 0xf).lookup_16(table1) & (in.chunks[3].shr<4>()).lookup_16(table2)
);
uint64_t op = simd8x64<bool>(
v.chunks[0].any_bits_set(0x7),
v.chunks[1].any_bits_set(0x7),
v.chunks[2].any_bits_set(0x7),
v.chunks[3].any_bits_set(0x7)
).to_bitmask();
uint64_t whitespace = simd8x64<bool>(
v.chunks[0].any_bits_set(0x18),
v.chunks[1].any_bits_set(0x18),
v.chunks[2].any_bits_set(0x18),
v.chunks[3].any_bits_set(0x18)
).to_bitmask();
return { whitespace, op };
}
simdjson_inline bool is_ascii(const simd8x64<uint8_t>& input) {
// careful: 0x80 is not ascii.
return input.reduce_or().saturating_sub(0x7fu).bits_not_set_anywhere();
}
simdjson_unused simdjson_inline simd8<bool> must_be_continuation(const simd8<uint8_t> prev1, const simd8<uint8_t> prev2, const simd8<uint8_t> prev3) {
simd8<uint8_t> is_second_byte = prev1.saturating_sub(0xc0u-1); // Only 11______ will be > 0
simd8<uint8_t> is_third_byte = prev2.saturating_sub(0xe0u-1); // Only 111_____ will be > 0
simd8<uint8_t> is_fourth_byte = prev3.saturating_sub(0xf0u-1); // Only 1111____ will be > 0
// Caller requires a bool (all 1's). All values resulting from the subtraction will be <= 64, so signed comparison is fine.
return simd8<int8_t>(is_second_byte | is_third_byte | is_fourth_byte) > int8_t(0);
}
simdjson_inline simd8<uint8_t> must_be_2_3_continuation(const simd8<uint8_t> prev2, const simd8<uint8_t> prev3) {
simd8<uint8_t> is_third_byte = prev2.saturating_sub(0xe0u-0x80); // Only 111_____ will be >= 0x80
simd8<uint8_t> is_fourth_byte = prev3.saturating_sub(0xf0u-0x80); // Only 1111____ will be >= 0x80
return is_third_byte | is_fourth_byte;
}
} // unnamed namespace
} // namespace ppc64
} // namespace simdjson
//
// Stage 2
//
//
// Implementation-specific overrides
//
namespace simdjson {
namespace ppc64 {
simdjson_warn_unused error_code implementation::minify(const uint8_t *buf, size_t len, uint8_t *dst, size_t &dst_len) const noexcept {
return ppc64::stage1::json_minifier::minify<64>(buf, len, dst, dst_len);
}
simdjson_warn_unused error_code dom_parser_implementation::stage1(const uint8_t *_buf, size_t _len, stage1_mode streaming) noexcept {
this->buf = _buf;
this->len = _len;
return ppc64::stage1::json_structural_indexer::index<64>(buf, len, *this, streaming);
}
simdjson_warn_unused bool implementation::validate_utf8(const char *buf, size_t len) const noexcept {
return ppc64::stage1::generic_validate_utf8(buf,len);
}
simdjson_warn_unused error_code dom_parser_implementation::stage2(dom::document &_doc) noexcept {
return stage2::tape_builder::parse_document<false>(*this, _doc);
}
simdjson_warn_unused error_code dom_parser_implementation::stage2_next(dom::document &_doc) noexcept {
return stage2::tape_builder::parse_document<true>(*this, _doc);
}
simdjson_warn_unused uint8_t *dom_parser_implementation::parse_string(const uint8_t *src, uint8_t *dst, bool replacement_char) const noexcept {
return ppc64::stringparsing::parse_string(src, dst, replacement_char);
}
simdjson_warn_unused uint8_t *dom_parser_implementation::parse_wobbly_string(const uint8_t *src, uint8_t *dst) const noexcept {
return ppc64::stringparsing::parse_wobbly_string(src, dst);
}
simdjson_warn_unused error_code dom_parser_implementation::parse(const uint8_t *_buf, size_t _len, dom::document &_doc) noexcept {
auto error = stage1(_buf, _len, stage1_mode::regular);
if (error) { return error; }
return stage2(_doc);
}
} // namespace ppc64
} // namespace simdjson
/* including simdjson/ppc64/end.h: #include <simdjson/ppc64/end.h> */
/* begin file simdjson/ppc64/end.h */
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/ppc64/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#undef SIMDJSON_SKIP_BACKSLASH_SHORT_CIRCUIT
/* undefining SIMDJSON_IMPLEMENTATION from "ppc64" */
#undef SIMDJSON_IMPLEMENTATION
/* end file simdjson/ppc64/end.h */
#endif // SIMDJSON_SRC_PPC64_CPP
/* end file ppc64.cpp */
#endif
#if SIMDJSON_IMPLEMENTATION_WESTMERE
/* including westmere.cpp: #include <westmere.cpp> */
/* begin file westmere.cpp */
#ifndef SIMDJSON_SRC_WESTMERE_CPP
#define SIMDJSON_SRC_WESTMERE_CPP
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include <base.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
/* including simdjson/westmere.h: #include <simdjson/westmere.h> */
/* begin file simdjson/westmere.h */
#ifndef SIMDJSON_WESTMERE_H
#define SIMDJSON_WESTMERE_H
/* including simdjson/westmere/begin.h: #include "simdjson/westmere/begin.h" */
/* begin file simdjson/westmere/begin.h */
/* defining SIMDJSON_IMPLEMENTATION to "westmere" */
#define SIMDJSON_IMPLEMENTATION westmere
/* including simdjson/westmere/base.h: #include "simdjson/westmere/base.h" */
/* begin file simdjson/westmere/base.h */
#ifndef SIMDJSON_WESTMERE_BASE_H
#define SIMDJSON_WESTMERE_BASE_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
// The constructor may be executed on any host, so we take care not to use SIMDJSON_TARGET_WESTMERE
namespace simdjson {
/**
* Implementation for Westmere (Intel SSE4.2).
*/
namespace westmere {
class implementation;
namespace {
namespace simd {
template <typename T> struct simd8;
template <typename T> struct simd8x64;
} // namespace simd
} // unnamed namespace
} // namespace westmere
} // namespace simdjson
#endif // SIMDJSON_WESTMERE_BASE_H
/* end file simdjson/westmere/base.h */
/* including simdjson/westmere/intrinsics.h: #include "simdjson/westmere/intrinsics.h" */
/* begin file simdjson/westmere/intrinsics.h */
#ifndef SIMDJSON_WESTMERE_INTRINSICS_H
#define SIMDJSON_WESTMERE_INTRINSICS_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/westmere/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#if SIMDJSON_VISUAL_STUDIO
// under clang within visual studio, this will include <x86intrin.h>
#include <intrin.h> // visual studio or clang
#else
#include <x86intrin.h> // elsewhere
#endif // SIMDJSON_VISUAL_STUDIO
#if SIMDJSON_CLANG_VISUAL_STUDIO
/**
* You are not supposed, normally, to include these
* headers directly. Instead you should either include intrin.h
* or x86intrin.h. However, when compiling with clang
* under Windows (i.e., when _MSC_VER is set), these headers
* only get included *if* the corresponding features are detected
* from macros:
*/
#include <smmintrin.h> // for _mm_alignr_epi8
#include <wmmintrin.h> // for _mm_clmulepi64_si128
#endif
static_assert(sizeof(__m128i) <= simdjson::SIMDJSON_PADDING, "insufficient padding for westmere");
#endif // SIMDJSON_WESTMERE_INTRINSICS_H
/* end file simdjson/westmere/intrinsics.h */
#if !SIMDJSON_CAN_ALWAYS_RUN_WESTMERE
SIMDJSON_TARGET_REGION("sse4.2,pclmul,popcnt")
#endif
/* including simdjson/westmere/bitmanipulation.h: #include "simdjson/westmere/bitmanipulation.h" */
/* begin file simdjson/westmere/bitmanipulation.h */
#ifndef SIMDJSON_WESTMERE_BITMANIPULATION_H
#define SIMDJSON_WESTMERE_BITMANIPULATION_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/westmere/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/westmere/intrinsics.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace westmere {
namespace {
// We sometimes call trailing_zero on inputs that are zero,
// but the algorithms do not end up using the returned value.
// Sadly, sanitizers are not smart enough to figure it out.
SIMDJSON_NO_SANITIZE_UNDEFINED
// This function can be used safely even if not all bytes have been
// initialized.
// See issue https://github.com/simdjson/simdjson/issues/1965
SIMDJSON_NO_SANITIZE_MEMORY
simdjson_inline int trailing_zeroes(uint64_t input_num) {
#if SIMDJSON_REGULAR_VISUAL_STUDIO
unsigned long ret;
// Search the mask data from least significant bit (LSB)
// to the most significant bit (MSB) for a set bit (1).
_BitScanForward64(&ret, input_num);
return (int)ret;
#else // SIMDJSON_REGULAR_VISUAL_STUDIO
return __builtin_ctzll(input_num);
#endif // SIMDJSON_REGULAR_VISUAL_STUDIO
}
/* result might be undefined when input_num is zero */
simdjson_inline uint64_t clear_lowest_bit(uint64_t input_num) {
return input_num & (input_num-1);
}
/* result might be undefined when input_num is zero */
simdjson_inline int leading_zeroes(uint64_t input_num) {
#if SIMDJSON_REGULAR_VISUAL_STUDIO
unsigned long leading_zero = 0;
// Search the mask data from most significant bit (MSB)
// to least significant bit (LSB) for a set bit (1).
if (_BitScanReverse64(&leading_zero, input_num))
return (int)(63 - leading_zero);
else
return 64;
#else
return __builtin_clzll(input_num);
#endif// SIMDJSON_REGULAR_VISUAL_STUDIO
}
#if SIMDJSON_REGULAR_VISUAL_STUDIO
simdjson_inline unsigned __int64 count_ones(uint64_t input_num) {
// note: we do not support legacy 32-bit Windows in this kernel
return __popcnt64(input_num);// Visual Studio wants two underscores
}
#else
simdjson_inline long long int count_ones(uint64_t input_num) {
return _popcnt64(input_num);
}
#endif
simdjson_inline bool add_overflow(uint64_t value1, uint64_t value2,
uint64_t *result) {
#if SIMDJSON_REGULAR_VISUAL_STUDIO
return _addcarry_u64(0, value1, value2,
reinterpret_cast<unsigned __int64 *>(result));
#else
return __builtin_uaddll_overflow(value1, value2,
reinterpret_cast<unsigned long long *>(result));
#endif
}
} // unnamed namespace
} // namespace westmere
} // namespace simdjson
#endif // SIMDJSON_WESTMERE_BITMANIPULATION_H
/* end file simdjson/westmere/bitmanipulation.h */
/* including simdjson/westmere/bitmask.h: #include "simdjson/westmere/bitmask.h" */
/* begin file simdjson/westmere/bitmask.h */
#ifndef SIMDJSON_WESTMERE_BITMASK_H
#define SIMDJSON_WESTMERE_BITMASK_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/westmere/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/westmere/intrinsics.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace westmere {
namespace {
//
// Perform a "cumulative bitwise xor," flipping bits each time a 1 is encountered.
//
// For example, prefix_xor(00100100) == 00011100
//
simdjson_inline uint64_t prefix_xor(const uint64_t bitmask) {
// There should be no such thing with a processing supporting avx2
// but not clmul.
__m128i all_ones = _mm_set1_epi8('\xFF');
__m128i result = _mm_clmulepi64_si128(_mm_set_epi64x(0ULL, bitmask), all_ones, 0);
return _mm_cvtsi128_si64(result);
}
} // unnamed namespace
} // namespace westmere
} // namespace simdjson
#endif // SIMDJSON_WESTMERE_BITMASK_H
/* end file simdjson/westmere/bitmask.h */
/* including simdjson/westmere/numberparsing_defs.h: #include "simdjson/westmere/numberparsing_defs.h" */
/* begin file simdjson/westmere/numberparsing_defs.h */
#ifndef SIMDJSON_WESTMERE_NUMBERPARSING_DEFS_H
#define SIMDJSON_WESTMERE_NUMBERPARSING_DEFS_H
/* including simdjson/westmere/base.h: #include "simdjson/westmere/base.h" */
/* begin file simdjson/westmere/base.h */
#ifndef SIMDJSON_WESTMERE_BASE_H
#define SIMDJSON_WESTMERE_BASE_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
// The constructor may be executed on any host, so we take care not to use SIMDJSON_TARGET_WESTMERE
namespace simdjson {
/**
* Implementation for Westmere (Intel SSE4.2).
*/
namespace westmere {
class implementation;
namespace {
namespace simd {
template <typename T> struct simd8;
template <typename T> struct simd8x64;
} // namespace simd
} // unnamed namespace
} // namespace westmere
} // namespace simdjson
#endif // SIMDJSON_WESTMERE_BASE_H
/* end file simdjson/westmere/base.h */
/* including simdjson/westmere/intrinsics.h: #include "simdjson/westmere/intrinsics.h" */
/* begin file simdjson/westmere/intrinsics.h */
#ifndef SIMDJSON_WESTMERE_INTRINSICS_H
#define SIMDJSON_WESTMERE_INTRINSICS_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/westmere/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#if SIMDJSON_VISUAL_STUDIO
// under clang within visual studio, this will include <x86intrin.h>
#include <intrin.h> // visual studio or clang
#else
#include <x86intrin.h> // elsewhere
#endif // SIMDJSON_VISUAL_STUDIO
#if SIMDJSON_CLANG_VISUAL_STUDIO
/**
* You are not supposed, normally, to include these
* headers directly. Instead you should either include intrin.h
* or x86intrin.h. However, when compiling with clang
* under Windows (i.e., when _MSC_VER is set), these headers
* only get included *if* the corresponding features are detected
* from macros:
*/
#include <smmintrin.h> // for _mm_alignr_epi8
#include <wmmintrin.h> // for _mm_clmulepi64_si128
#endif
static_assert(sizeof(__m128i) <= simdjson::SIMDJSON_PADDING, "insufficient padding for westmere");
#endif // SIMDJSON_WESTMERE_INTRINSICS_H
/* end file simdjson/westmere/intrinsics.h */
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/internal/numberparsing_tables.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace westmere {
namespace numberparsing {
/** @private */
static simdjson_inline uint32_t parse_eight_digits_unrolled(const uint8_t *chars) {
// this actually computes *16* values so we are being wasteful.
const __m128i ascii0 = _mm_set1_epi8('0');
const __m128i mul_1_10 =
_mm_setr_epi8(10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1);
const __m128i mul_1_100 = _mm_setr_epi16(100, 1, 100, 1, 100, 1, 100, 1);
const __m128i mul_1_10000 =
_mm_setr_epi16(10000, 1, 10000, 1, 10000, 1, 10000, 1);
const __m128i input = _mm_sub_epi8(
_mm_loadu_si128(reinterpret_cast<const __m128i *>(chars)), ascii0);
const __m128i t1 = _mm_maddubs_epi16(input, mul_1_10);
const __m128i t2 = _mm_madd_epi16(t1, mul_1_100);
const __m128i t3 = _mm_packus_epi32(t2, t2);
const __m128i t4 = _mm_madd_epi16(t3, mul_1_10000);
return _mm_cvtsi128_si32(
t4); // only captures the sum of the first 8 digits, drop the rest
}
/** @private */
simdjson_inline internal::value128 full_multiplication(uint64_t value1, uint64_t value2) {
internal::value128 answer;
#if SIMDJSON_REGULAR_VISUAL_STUDIO || SIMDJSON_IS_32BITS
#ifdef _M_ARM64
// ARM64 has native support for 64-bit multiplications, no need to emultate
answer.high = __umulh(value1, value2);
answer.low = value1 * value2;
#else
answer.low = _umul128(value1, value2, &answer.high); // _umul128 not available on ARM64
#endif // _M_ARM64
#else // SIMDJSON_REGULAR_VISUAL_STUDIO || SIMDJSON_IS_32BITS
__uint128_t r = (static_cast<__uint128_t>(value1)) * value2;
answer.low = uint64_t(r);
answer.high = uint64_t(r >> 64);
#endif
return answer;
}
} // namespace numberparsing
} // namespace westmere
} // namespace simdjson
#define SIMDJSON_SWAR_NUMBER_PARSING 1
#endif // SIMDJSON_WESTMERE_NUMBERPARSING_DEFS_H
/* end file simdjson/westmere/numberparsing_defs.h */
/* including simdjson/westmere/simd.h: #include "simdjson/westmere/simd.h" */
/* begin file simdjson/westmere/simd.h */
#ifndef SIMDJSON_WESTMERE_SIMD_H
#define SIMDJSON_WESTMERE_SIMD_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/westmere/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/westmere/bitmanipulation.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/simdprune_tables.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace westmere {
namespace {
namespace simd {
template<typename Child>
struct base {
__m128i value;
// Zero constructor
simdjson_inline base() : value{__m128i()} {}
// Conversion from SIMD register
simdjson_inline base(const __m128i _value) : value(_value) {}
// Conversion to SIMD register
simdjson_inline operator const __m128i&() const { return this->value; }
simdjson_inline operator __m128i&() { return this->value; }
// Bit operations
simdjson_inline Child operator|(const Child other) const { return _mm_or_si128(*this, other); }
simdjson_inline Child operator&(const Child other) const { return _mm_and_si128(*this, other); }
simdjson_inline Child operator^(const Child other) const { return _mm_xor_si128(*this, other); }
simdjson_inline Child bit_andnot(const Child other) const { return _mm_andnot_si128(other, *this); }
simdjson_inline Child& operator|=(const Child other) { auto this_cast = static_cast<Child*>(this); *this_cast = *this_cast | other; return *this_cast; }
simdjson_inline Child& operator&=(const Child other) { auto this_cast = static_cast<Child*>(this); *this_cast = *this_cast & other; return *this_cast; }
simdjson_inline Child& operator^=(const Child other) { auto this_cast = static_cast<Child*>(this); *this_cast = *this_cast ^ other; return *this_cast; }
};
template<typename T, typename Mask=simd8<bool>>
struct base8: base<simd8<T>> {
typedef uint16_t bitmask_t;
typedef uint32_t bitmask2_t;
simdjson_inline base8() : base<simd8<T>>() {}
simdjson_inline base8(const __m128i _value) : base<simd8<T>>(_value) {}
friend simdjson_inline Mask operator==(const simd8<T> lhs, const simd8<T> rhs) { return _mm_cmpeq_epi8(lhs, rhs); }
static const int SIZE = sizeof(base<simd8<T>>::value);
template<int N=1>
simdjson_inline simd8<T> prev(const simd8<T> prev_chunk) const {
return _mm_alignr_epi8(*this, prev_chunk, 16 - N);
}
};
// SIMD byte mask type (returned by things like eq and gt)
template<>
struct simd8<bool>: base8<bool> {
static simdjson_inline simd8<bool> splat(bool _value) { return _mm_set1_epi8(uint8_t(-(!!_value))); }
simdjson_inline simd8<bool>() : base8() {}
simdjson_inline simd8<bool>(const __m128i _value) : base8<bool>(_value) {}
// Splat constructor
simdjson_inline simd8<bool>(bool _value) : base8<bool>(splat(_value)) {}
simdjson_inline int to_bitmask() const { return _mm_movemask_epi8(*this); }
simdjson_inline bool any() const { return !_mm_testz_si128(*this, *this); }
simdjson_inline simd8<bool> operator~() const { return *this ^ true; }
};
template<typename T>
struct base8_numeric: base8<T> {
static simdjson_inline simd8<T> splat(T _value) { return _mm_set1_epi8(_value); }
static simdjson_inline simd8<T> zero() { return _mm_setzero_si128(); }
static simdjson_inline simd8<T> load(const T values[16]) {
return _mm_loadu_si128(reinterpret_cast<const __m128i *>(values));
}
// Repeat 16 values as many times as necessary (usually for lookup tables)
static simdjson_inline simd8<T> repeat_16(
T v0, T v1, T v2, T v3, T v4, T v5, T v6, T v7,
T v8, T v9, T v10, T v11, T v12, T v13, T v14, T v15
) {
return simd8<T>(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
);
}
simdjson_inline base8_numeric() : base8<T>() {}
simdjson_inline base8_numeric(const __m128i _value) : base8<T>(_value) {}
// Store to array
simdjson_inline void store(T dst[16]) const { return _mm_storeu_si128(reinterpret_cast<__m128i *>(dst), *this); }
// Override to distinguish from bool version
simdjson_inline simd8<T> operator~() const { return *this ^ 0xFFu; }
// Addition/subtraction are the same for signed and unsigned
simdjson_inline simd8<T> operator+(const simd8<T> other) const { return _mm_add_epi8(*this, other); }
simdjson_inline simd8<T> operator-(const simd8<T> other) const { return _mm_sub_epi8(*this, other); }
simdjson_inline simd8<T>& operator+=(const simd8<T> other) { *this = *this + other; return *static_cast<simd8<T>*>(this); }
simdjson_inline simd8<T>& operator-=(const simd8<T> other) { *this = *this - other; return *static_cast<simd8<T>*>(this); }
// Perform a lookup assuming the value is between 0 and 16 (undefined behavior for out of range values)
template<typename L>
simdjson_inline simd8<L> lookup_16(simd8<L> lookup_table) const {
return _mm_shuffle_epi8(lookup_table, *this);
}
// Copies to 'output" all bytes corresponding to a 0 in the mask (interpreted as a bitset).
// Passing a 0 value for mask would be equivalent to writing out every byte to output.
// Only the first 16 - count_ones(mask) bytes of the result are significant but 16 bytes
// get written.
// Design consideration: it seems like a function with the
// signature simd8<L> compress(uint32_t mask) would be
// sensible, but the AVX ISA makes this kind of approach difficult.
template<typename L>
simdjson_inline void compress(uint16_t mask, L * output) const {
using internal::thintable_epi8;
using internal::BitsSetTable256mul2;
using internal::pshufb_combine_table;
// this particular implementation was inspired by work done by @animetosho
// we do it in two steps, first 8 bytes and then second 8 bytes
uint8_t mask1 = uint8_t(mask); // least significant 8 bits
uint8_t mask2 = uint8_t(mask >> 8); // most significant 8 bits
// next line just loads the 64-bit values thintable_epi8[mask1] and
// thintable_epi8[mask2] into a 128-bit register, using only
// two instructions on most compilers.
__m128i shufmask = _mm_set_epi64x(thintable_epi8[mask2], thintable_epi8[mask1]);
// we increment by 0x08 the second half of the mask
shufmask =
_mm_add_epi8(shufmask, _mm_set_epi32(0x08080808, 0x08080808, 0, 0));
// this is the version "nearly pruned"
__m128i pruned = _mm_shuffle_epi8(*this, shufmask);
// we still need to put the two halves together.
// we compute the popcount of the first half:
int pop1 = BitsSetTable256mul2[mask1];
// then load the corresponding mask, what it does is to write
// only the first pop1 bytes from the first 8 bytes, and then
// it fills in with the bytes from the second 8 bytes + some filling
// at the end.
__m128i compactmask =
_mm_loadu_si128(reinterpret_cast<const __m128i *>(pshufb_combine_table + pop1 * 8));
__m128i answer = _mm_shuffle_epi8(pruned, compactmask);
_mm_storeu_si128(reinterpret_cast<__m128i *>(output), answer);
}
template<typename L>
simdjson_inline simd8<L> lookup_16(
L replace0, L replace1, L replace2, L replace3,
L replace4, L replace5, L replace6, L replace7,
L replace8, L replace9, L replace10, L replace11,
L replace12, L replace13, L replace14, L replace15) const {
return lookup_16(simd8<L>::repeat_16(
replace0, replace1, replace2, replace3,
replace4, replace5, replace6, replace7,
replace8, replace9, replace10, replace11,
replace12, replace13, replace14, replace15
));
}
};
// Signed bytes
template<>
struct simd8<int8_t> : base8_numeric<int8_t> {
simdjson_inline simd8() : base8_numeric<int8_t>() {}
simdjson_inline simd8(const __m128i _value) : base8_numeric<int8_t>(_value) {}
// Splat constructor
simdjson_inline simd8(int8_t _value) : simd8(splat(_value)) {}
// Array constructor
simdjson_inline simd8(const int8_t* values) : simd8(load(values)) {}
// Member-by-member initialization
simdjson_inline simd8(
int8_t v0, int8_t v1, int8_t v2, int8_t v3, int8_t v4, int8_t v5, int8_t v6, int8_t v7,
int8_t v8, int8_t v9, int8_t v10, int8_t v11, int8_t v12, int8_t v13, int8_t v14, int8_t v15
) : simd8(_mm_setr_epi8(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
)) {}
// Repeat 16 values as many times as necessary (usually for lookup tables)
simdjson_inline static simd8<int8_t> repeat_16(
int8_t v0, int8_t v1, int8_t v2, int8_t v3, int8_t v4, int8_t v5, int8_t v6, int8_t v7,
int8_t v8, int8_t v9, int8_t v10, int8_t v11, int8_t v12, int8_t v13, int8_t v14, int8_t v15
) {
return simd8<int8_t>(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
);
}
// Order-sensitive comparisons
simdjson_inline simd8<int8_t> max_val(const simd8<int8_t> other) const { return _mm_max_epi8(*this, other); }
simdjson_inline simd8<int8_t> min_val(const simd8<int8_t> other) const { return _mm_min_epi8(*this, other); }
simdjson_inline simd8<bool> operator>(const simd8<int8_t> other) const { return _mm_cmpgt_epi8(*this, other); }
simdjson_inline simd8<bool> operator<(const simd8<int8_t> other) const { return _mm_cmpgt_epi8(other, *this); }
};
// Unsigned bytes
template<>
struct simd8<uint8_t>: base8_numeric<uint8_t> {
simdjson_inline simd8() : base8_numeric<uint8_t>() {}
simdjson_inline simd8(const __m128i _value) : base8_numeric<uint8_t>(_value) {}
// Splat constructor
simdjson_inline simd8(uint8_t _value) : simd8(splat(_value)) {}
// Array constructor
simdjson_inline simd8(const uint8_t* values) : simd8(load(values)) {}
// Member-by-member initialization
simdjson_inline simd8(
uint8_t v0, uint8_t v1, uint8_t v2, uint8_t v3, uint8_t v4, uint8_t v5, uint8_t v6, uint8_t v7,
uint8_t v8, uint8_t v9, uint8_t v10, uint8_t v11, uint8_t v12, uint8_t v13, uint8_t v14, uint8_t v15
) : simd8(_mm_setr_epi8(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
)) {}
// Repeat 16 values as many times as necessary (usually for lookup tables)
simdjson_inline static simd8<uint8_t> repeat_16(
uint8_t v0, uint8_t v1, uint8_t v2, uint8_t v3, uint8_t v4, uint8_t v5, uint8_t v6, uint8_t v7,
uint8_t v8, uint8_t v9, uint8_t v10, uint8_t v11, uint8_t v12, uint8_t v13, uint8_t v14, uint8_t v15
) {
return simd8<uint8_t>(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
);
}
// Saturated math
simdjson_inline simd8<uint8_t> saturating_add(const simd8<uint8_t> other) const { return _mm_adds_epu8(*this, other); }
simdjson_inline simd8<uint8_t> saturating_sub(const simd8<uint8_t> other) const { return _mm_subs_epu8(*this, other); }
// Order-specific operations
simdjson_inline simd8<uint8_t> max_val(const simd8<uint8_t> other) const { return _mm_max_epu8(*this, other); }
simdjson_inline simd8<uint8_t> min_val(const simd8<uint8_t> other) const { return _mm_min_epu8(*this, other); }
// Same as >, but only guarantees true is nonzero (< guarantees true = -1)
simdjson_inline simd8<uint8_t> gt_bits(const simd8<uint8_t> other) const { return this->saturating_sub(other); }
// Same as <, but only guarantees true is nonzero (< guarantees true = -1)
simdjson_inline simd8<uint8_t> lt_bits(const simd8<uint8_t> other) const { return other.saturating_sub(*this); }
simdjson_inline simd8<bool> operator<=(const simd8<uint8_t> other) const { return other.max_val(*this) == other; }
simdjson_inline simd8<bool> operator>=(const simd8<uint8_t> other) const { return other.min_val(*this) == other; }
simdjson_inline simd8<bool> operator>(const simd8<uint8_t> other) const { return this->gt_bits(other).any_bits_set(); }
simdjson_inline simd8<bool> operator<(const simd8<uint8_t> other) const { return this->gt_bits(other).any_bits_set(); }
// Bit-specific operations
simdjson_inline simd8<bool> bits_not_set() const { return *this == uint8_t(0); }
simdjson_inline simd8<bool> bits_not_set(simd8<uint8_t> bits) const { return (*this & bits).bits_not_set(); }
simdjson_inline simd8<bool> any_bits_set() const { return ~this->bits_not_set(); }
simdjson_inline simd8<bool> any_bits_set(simd8<uint8_t> bits) const { return ~this->bits_not_set(bits); }
simdjson_inline bool is_ascii() const { return _mm_movemask_epi8(*this) == 0; }
simdjson_inline bool bits_not_set_anywhere() const { return _mm_testz_si128(*this, *this); }
simdjson_inline bool any_bits_set_anywhere() const { return !bits_not_set_anywhere(); }
simdjson_inline bool bits_not_set_anywhere(simd8<uint8_t> bits) const { return _mm_testz_si128(*this, bits); }
simdjson_inline bool any_bits_set_anywhere(simd8<uint8_t> bits) const { return !bits_not_set_anywhere(bits); }
template<int N>
simdjson_inline simd8<uint8_t> shr() const { return simd8<uint8_t>(_mm_srli_epi16(*this, N)) & uint8_t(0xFFu >> N); }
template<int N>
simdjson_inline simd8<uint8_t> shl() const { return simd8<uint8_t>(_mm_slli_epi16(*this, N)) & uint8_t(0xFFu << N); }
// Get one of the bits and make a bitmask out of it.
// e.g. value.get_bit<7>() gets the high bit
template<int N>
simdjson_inline int get_bit() const { return _mm_movemask_epi8(_mm_slli_epi16(*this, 7-N)); }
};
template<typename T>
struct simd8x64 {
static constexpr int NUM_CHUNKS = 64 / sizeof(simd8<T>);
static_assert(NUM_CHUNKS == 4, "Westmere kernel should use four registers per 64-byte block.");
const simd8<T> chunks[NUM_CHUNKS];
simd8x64(const simd8x64<T>& o) = delete; // no copy allowed
simd8x64<T>& operator=(const simd8<T>& other) = delete; // no assignment allowed
simd8x64() = delete; // no default constructor allowed
simdjson_inline simd8x64(const simd8<T> chunk0, const simd8<T> chunk1, const simd8<T> chunk2, const simd8<T> chunk3) : chunks{chunk0, chunk1, chunk2, chunk3} {}
simdjson_inline simd8x64(const T ptr[64]) : chunks{simd8<T>::load(ptr), simd8<T>::load(ptr+16), simd8<T>::load(ptr+32), simd8<T>::load(ptr+48)} {}
simdjson_inline void store(T ptr[64]) const {
this->chunks[0].store(ptr+sizeof(simd8<T>)*0);
this->chunks[1].store(ptr+sizeof(simd8<T>)*1);
this->chunks[2].store(ptr+sizeof(simd8<T>)*2);
this->chunks[3].store(ptr+sizeof(simd8<T>)*3);
}
simdjson_inline simd8<T> reduce_or() const {
return (this->chunks[0] | this->chunks[1]) | (this->chunks[2] | this->chunks[3]);
}
simdjson_inline uint64_t compress(uint64_t mask, T * output) const {
this->chunks[0].compress(uint16_t(mask), output);
this->chunks[1].compress(uint16_t(mask >> 16), output + 16 - count_ones(mask & 0xFFFF));
this->chunks[2].compress(uint16_t(mask >> 32), output + 32 - count_ones(mask & 0xFFFFFFFF));
this->chunks[3].compress(uint16_t(mask >> 48), output + 48 - count_ones(mask & 0xFFFFFFFFFFFF));
return 64 - count_ones(mask);
}
simdjson_inline uint64_t to_bitmask() const {
uint64_t r0 = uint32_t(this->chunks[0].to_bitmask() );
uint64_t r1 = this->chunks[1].to_bitmask() ;
uint64_t r2 = this->chunks[2].to_bitmask() ;
uint64_t r3 = this->chunks[3].to_bitmask() ;
return r0 | (r1 << 16) | (r2 << 32) | (r3 << 48);
}
simdjson_inline uint64_t eq(const T m) const {
const simd8<T> mask = simd8<T>::splat(m);
return simd8x64<bool>(
this->chunks[0] == mask,
this->chunks[1] == mask,
this->chunks[2] == mask,
this->chunks[3] == mask
).to_bitmask();
}
simdjson_inline uint64_t eq(const simd8x64<uint8_t> &other) const {
return simd8x64<bool>(
this->chunks[0] == other.chunks[0],
this->chunks[1] == other.chunks[1],
this->chunks[2] == other.chunks[2],
this->chunks[3] == other.chunks[3]
).to_bitmask();
}
simdjson_inline uint64_t lteq(const T m) const {
const simd8<T> mask = simd8<T>::splat(m);
return simd8x64<bool>(
this->chunks[0] <= mask,
this->chunks[1] <= mask,
this->chunks[2] <= mask,
this->chunks[3] <= mask
).to_bitmask();
}
}; // struct simd8x64<T>
} // namespace simd
} // unnamed namespace
} // namespace westmere
} // namespace simdjson
#endif // SIMDJSON_WESTMERE_SIMD_INPUT_H
/* end file simdjson/westmere/simd.h */
/* including simdjson/westmere/stringparsing_defs.h: #include "simdjson/westmere/stringparsing_defs.h" */
/* begin file simdjson/westmere/stringparsing_defs.h */
#ifndef SIMDJSON_WESTMERE_STRINGPARSING_DEFS_H
#define SIMDJSON_WESTMERE_STRINGPARSING_DEFS_H
/* including simdjson/westmere/bitmanipulation.h: #include "simdjson/westmere/bitmanipulation.h" */
/* begin file simdjson/westmere/bitmanipulation.h */
#ifndef SIMDJSON_WESTMERE_BITMANIPULATION_H
#define SIMDJSON_WESTMERE_BITMANIPULATION_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/westmere/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/westmere/intrinsics.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace westmere {
namespace {
// We sometimes call trailing_zero on inputs that are zero,
// but the algorithms do not end up using the returned value.
// Sadly, sanitizers are not smart enough to figure it out.
SIMDJSON_NO_SANITIZE_UNDEFINED
// This function can be used safely even if not all bytes have been
// initialized.
// See issue https://github.com/simdjson/simdjson/issues/1965
SIMDJSON_NO_SANITIZE_MEMORY
simdjson_inline int trailing_zeroes(uint64_t input_num) {
#if SIMDJSON_REGULAR_VISUAL_STUDIO
unsigned long ret;
// Search the mask data from least significant bit (LSB)
// to the most significant bit (MSB) for a set bit (1).
_BitScanForward64(&ret, input_num);
return (int)ret;
#else // SIMDJSON_REGULAR_VISUAL_STUDIO
return __builtin_ctzll(input_num);
#endif // SIMDJSON_REGULAR_VISUAL_STUDIO
}
/* result might be undefined when input_num is zero */
simdjson_inline uint64_t clear_lowest_bit(uint64_t input_num) {
return input_num & (input_num-1);
}
/* result might be undefined when input_num is zero */
simdjson_inline int leading_zeroes(uint64_t input_num) {
#if SIMDJSON_REGULAR_VISUAL_STUDIO
unsigned long leading_zero = 0;
// Search the mask data from most significant bit (MSB)
// to least significant bit (LSB) for a set bit (1).
if (_BitScanReverse64(&leading_zero, input_num))
return (int)(63 - leading_zero);
else
return 64;
#else
return __builtin_clzll(input_num);
#endif// SIMDJSON_REGULAR_VISUAL_STUDIO
}
#if SIMDJSON_REGULAR_VISUAL_STUDIO
simdjson_inline unsigned __int64 count_ones(uint64_t input_num) {
// note: we do not support legacy 32-bit Windows in this kernel
return __popcnt64(input_num);// Visual Studio wants two underscores
}
#else
simdjson_inline long long int count_ones(uint64_t input_num) {
return _popcnt64(input_num);
}
#endif
simdjson_inline bool add_overflow(uint64_t value1, uint64_t value2,
uint64_t *result) {
#if SIMDJSON_REGULAR_VISUAL_STUDIO
return _addcarry_u64(0, value1, value2,
reinterpret_cast<unsigned __int64 *>(result));
#else
return __builtin_uaddll_overflow(value1, value2,
reinterpret_cast<unsigned long long *>(result));
#endif
}
} // unnamed namespace
} // namespace westmere
} // namespace simdjson
#endif // SIMDJSON_WESTMERE_BITMANIPULATION_H
/* end file simdjson/westmere/bitmanipulation.h */
/* including simdjson/westmere/simd.h: #include "simdjson/westmere/simd.h" */
/* begin file simdjson/westmere/simd.h */
#ifndef SIMDJSON_WESTMERE_SIMD_H
#define SIMDJSON_WESTMERE_SIMD_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/westmere/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/westmere/bitmanipulation.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/simdprune_tables.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace westmere {
namespace {
namespace simd {
template<typename Child>
struct base {
__m128i value;
// Zero constructor
simdjson_inline base() : value{__m128i()} {}
// Conversion from SIMD register
simdjson_inline base(const __m128i _value) : value(_value) {}
// Conversion to SIMD register
simdjson_inline operator const __m128i&() const { return this->value; }
simdjson_inline operator __m128i&() { return this->value; }
// Bit operations
simdjson_inline Child operator|(const Child other) const { return _mm_or_si128(*this, other); }
simdjson_inline Child operator&(const Child other) const { return _mm_and_si128(*this, other); }
simdjson_inline Child operator^(const Child other) const { return _mm_xor_si128(*this, other); }
simdjson_inline Child bit_andnot(const Child other) const { return _mm_andnot_si128(other, *this); }
simdjson_inline Child& operator|=(const Child other) { auto this_cast = static_cast<Child*>(this); *this_cast = *this_cast | other; return *this_cast; }
simdjson_inline Child& operator&=(const Child other) { auto this_cast = static_cast<Child*>(this); *this_cast = *this_cast & other; return *this_cast; }
simdjson_inline Child& operator^=(const Child other) { auto this_cast = static_cast<Child*>(this); *this_cast = *this_cast ^ other; return *this_cast; }
};
template<typename T, typename Mask=simd8<bool>>
struct base8: base<simd8<T>> {
typedef uint16_t bitmask_t;
typedef uint32_t bitmask2_t;
simdjson_inline base8() : base<simd8<T>>() {}
simdjson_inline base8(const __m128i _value) : base<simd8<T>>(_value) {}
friend simdjson_inline Mask operator==(const simd8<T> lhs, const simd8<T> rhs) { return _mm_cmpeq_epi8(lhs, rhs); }
static const int SIZE = sizeof(base<simd8<T>>::value);
template<int N=1>
simdjson_inline simd8<T> prev(const simd8<T> prev_chunk) const {
return _mm_alignr_epi8(*this, prev_chunk, 16 - N);
}
};
// SIMD byte mask type (returned by things like eq and gt)
template<>
struct simd8<bool>: base8<bool> {
static simdjson_inline simd8<bool> splat(bool _value) { return _mm_set1_epi8(uint8_t(-(!!_value))); }
simdjson_inline simd8<bool>() : base8() {}
simdjson_inline simd8<bool>(const __m128i _value) : base8<bool>(_value) {}
// Splat constructor
simdjson_inline simd8<bool>(bool _value) : base8<bool>(splat(_value)) {}
simdjson_inline int to_bitmask() const { return _mm_movemask_epi8(*this); }
simdjson_inline bool any() const { return !_mm_testz_si128(*this, *this); }
simdjson_inline simd8<bool> operator~() const { return *this ^ true; }
};
template<typename T>
struct base8_numeric: base8<T> {
static simdjson_inline simd8<T> splat(T _value) { return _mm_set1_epi8(_value); }
static simdjson_inline simd8<T> zero() { return _mm_setzero_si128(); }
static simdjson_inline simd8<T> load(const T values[16]) {
return _mm_loadu_si128(reinterpret_cast<const __m128i *>(values));
}
// Repeat 16 values as many times as necessary (usually for lookup tables)
static simdjson_inline simd8<T> repeat_16(
T v0, T v1, T v2, T v3, T v4, T v5, T v6, T v7,
T v8, T v9, T v10, T v11, T v12, T v13, T v14, T v15
) {
return simd8<T>(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
);
}
simdjson_inline base8_numeric() : base8<T>() {}
simdjson_inline base8_numeric(const __m128i _value) : base8<T>(_value) {}
// Store to array
simdjson_inline void store(T dst[16]) const { return _mm_storeu_si128(reinterpret_cast<__m128i *>(dst), *this); }
// Override to distinguish from bool version
simdjson_inline simd8<T> operator~() const { return *this ^ 0xFFu; }
// Addition/subtraction are the same for signed and unsigned
simdjson_inline simd8<T> operator+(const simd8<T> other) const { return _mm_add_epi8(*this, other); }
simdjson_inline simd8<T> operator-(const simd8<T> other) const { return _mm_sub_epi8(*this, other); }
simdjson_inline simd8<T>& operator+=(const simd8<T> other) { *this = *this + other; return *static_cast<simd8<T>*>(this); }
simdjson_inline simd8<T>& operator-=(const simd8<T> other) { *this = *this - other; return *static_cast<simd8<T>*>(this); }
// Perform a lookup assuming the value is between 0 and 16 (undefined behavior for out of range values)
template<typename L>
simdjson_inline simd8<L> lookup_16(simd8<L> lookup_table) const {
return _mm_shuffle_epi8(lookup_table, *this);
}
// Copies to 'output" all bytes corresponding to a 0 in the mask (interpreted as a bitset).
// Passing a 0 value for mask would be equivalent to writing out every byte to output.
// Only the first 16 - count_ones(mask) bytes of the result are significant but 16 bytes
// get written.
// Design consideration: it seems like a function with the
// signature simd8<L> compress(uint32_t mask) would be
// sensible, but the AVX ISA makes this kind of approach difficult.
template<typename L>
simdjson_inline void compress(uint16_t mask, L * output) const {
using internal::thintable_epi8;
using internal::BitsSetTable256mul2;
using internal::pshufb_combine_table;
// this particular implementation was inspired by work done by @animetosho
// we do it in two steps, first 8 bytes and then second 8 bytes
uint8_t mask1 = uint8_t(mask); // least significant 8 bits
uint8_t mask2 = uint8_t(mask >> 8); // most significant 8 bits
// next line just loads the 64-bit values thintable_epi8[mask1] and
// thintable_epi8[mask2] into a 128-bit register, using only
// two instructions on most compilers.
__m128i shufmask = _mm_set_epi64x(thintable_epi8[mask2], thintable_epi8[mask1]);
// we increment by 0x08 the second half of the mask
shufmask =
_mm_add_epi8(shufmask, _mm_set_epi32(0x08080808, 0x08080808, 0, 0));
// this is the version "nearly pruned"
__m128i pruned = _mm_shuffle_epi8(*this, shufmask);
// we still need to put the two halves together.
// we compute the popcount of the first half:
int pop1 = BitsSetTable256mul2[mask1];
// then load the corresponding mask, what it does is to write
// only the first pop1 bytes from the first 8 bytes, and then
// it fills in with the bytes from the second 8 bytes + some filling
// at the end.
__m128i compactmask =
_mm_loadu_si128(reinterpret_cast<const __m128i *>(pshufb_combine_table + pop1 * 8));
__m128i answer = _mm_shuffle_epi8(pruned, compactmask);
_mm_storeu_si128(reinterpret_cast<__m128i *>(output), answer);
}
template<typename L>
simdjson_inline simd8<L> lookup_16(
L replace0, L replace1, L replace2, L replace3,
L replace4, L replace5, L replace6, L replace7,
L replace8, L replace9, L replace10, L replace11,
L replace12, L replace13, L replace14, L replace15) const {
return lookup_16(simd8<L>::repeat_16(
replace0, replace1, replace2, replace3,
replace4, replace5, replace6, replace7,
replace8, replace9, replace10, replace11,
replace12, replace13, replace14, replace15
));
}
};
// Signed bytes
template<>
struct simd8<int8_t> : base8_numeric<int8_t> {
simdjson_inline simd8() : base8_numeric<int8_t>() {}
simdjson_inline simd8(const __m128i _value) : base8_numeric<int8_t>(_value) {}
// Splat constructor
simdjson_inline simd8(int8_t _value) : simd8(splat(_value)) {}
// Array constructor
simdjson_inline simd8(const int8_t* values) : simd8(load(values)) {}
// Member-by-member initialization
simdjson_inline simd8(
int8_t v0, int8_t v1, int8_t v2, int8_t v3, int8_t v4, int8_t v5, int8_t v6, int8_t v7,
int8_t v8, int8_t v9, int8_t v10, int8_t v11, int8_t v12, int8_t v13, int8_t v14, int8_t v15
) : simd8(_mm_setr_epi8(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
)) {}
// Repeat 16 values as many times as necessary (usually for lookup tables)
simdjson_inline static simd8<int8_t> repeat_16(
int8_t v0, int8_t v1, int8_t v2, int8_t v3, int8_t v4, int8_t v5, int8_t v6, int8_t v7,
int8_t v8, int8_t v9, int8_t v10, int8_t v11, int8_t v12, int8_t v13, int8_t v14, int8_t v15
) {
return simd8<int8_t>(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
);
}
// Order-sensitive comparisons
simdjson_inline simd8<int8_t> max_val(const simd8<int8_t> other) const { return _mm_max_epi8(*this, other); }
simdjson_inline simd8<int8_t> min_val(const simd8<int8_t> other) const { return _mm_min_epi8(*this, other); }
simdjson_inline simd8<bool> operator>(const simd8<int8_t> other) const { return _mm_cmpgt_epi8(*this, other); }
simdjson_inline simd8<bool> operator<(const simd8<int8_t> other) const { return _mm_cmpgt_epi8(other, *this); }
};
// Unsigned bytes
template<>
struct simd8<uint8_t>: base8_numeric<uint8_t> {
simdjson_inline simd8() : base8_numeric<uint8_t>() {}
simdjson_inline simd8(const __m128i _value) : base8_numeric<uint8_t>(_value) {}
// Splat constructor
simdjson_inline simd8(uint8_t _value) : simd8(splat(_value)) {}
// Array constructor
simdjson_inline simd8(const uint8_t* values) : simd8(load(values)) {}
// Member-by-member initialization
simdjson_inline simd8(
uint8_t v0, uint8_t v1, uint8_t v2, uint8_t v3, uint8_t v4, uint8_t v5, uint8_t v6, uint8_t v7,
uint8_t v8, uint8_t v9, uint8_t v10, uint8_t v11, uint8_t v12, uint8_t v13, uint8_t v14, uint8_t v15
) : simd8(_mm_setr_epi8(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
)) {}
// Repeat 16 values as many times as necessary (usually for lookup tables)
simdjson_inline static simd8<uint8_t> repeat_16(
uint8_t v0, uint8_t v1, uint8_t v2, uint8_t v3, uint8_t v4, uint8_t v5, uint8_t v6, uint8_t v7,
uint8_t v8, uint8_t v9, uint8_t v10, uint8_t v11, uint8_t v12, uint8_t v13, uint8_t v14, uint8_t v15
) {
return simd8<uint8_t>(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
);
}
// Saturated math
simdjson_inline simd8<uint8_t> saturating_add(const simd8<uint8_t> other) const { return _mm_adds_epu8(*this, other); }
simdjson_inline simd8<uint8_t> saturating_sub(const simd8<uint8_t> other) const { return _mm_subs_epu8(*this, other); }
// Order-specific operations
simdjson_inline simd8<uint8_t> max_val(const simd8<uint8_t> other) const { return _mm_max_epu8(*this, other); }
simdjson_inline simd8<uint8_t> min_val(const simd8<uint8_t> other) const { return _mm_min_epu8(*this, other); }
// Same as >, but only guarantees true is nonzero (< guarantees true = -1)
simdjson_inline simd8<uint8_t> gt_bits(const simd8<uint8_t> other) const { return this->saturating_sub(other); }
// Same as <, but only guarantees true is nonzero (< guarantees true = -1)
simdjson_inline simd8<uint8_t> lt_bits(const simd8<uint8_t> other) const { return other.saturating_sub(*this); }
simdjson_inline simd8<bool> operator<=(const simd8<uint8_t> other) const { return other.max_val(*this) == other; }
simdjson_inline simd8<bool> operator>=(const simd8<uint8_t> other) const { return other.min_val(*this) == other; }
simdjson_inline simd8<bool> operator>(const simd8<uint8_t> other) const { return this->gt_bits(other).any_bits_set(); }
simdjson_inline simd8<bool> operator<(const simd8<uint8_t> other) const { return this->gt_bits(other).any_bits_set(); }
// Bit-specific operations
simdjson_inline simd8<bool> bits_not_set() const { return *this == uint8_t(0); }
simdjson_inline simd8<bool> bits_not_set(simd8<uint8_t> bits) const { return (*this & bits).bits_not_set(); }
simdjson_inline simd8<bool> any_bits_set() const { return ~this->bits_not_set(); }
simdjson_inline simd8<bool> any_bits_set(simd8<uint8_t> bits) const { return ~this->bits_not_set(bits); }
simdjson_inline bool is_ascii() const { return _mm_movemask_epi8(*this) == 0; }
simdjson_inline bool bits_not_set_anywhere() const { return _mm_testz_si128(*this, *this); }
simdjson_inline bool any_bits_set_anywhere() const { return !bits_not_set_anywhere(); }
simdjson_inline bool bits_not_set_anywhere(simd8<uint8_t> bits) const { return _mm_testz_si128(*this, bits); }
simdjson_inline bool any_bits_set_anywhere(simd8<uint8_t> bits) const { return !bits_not_set_anywhere(bits); }
template<int N>
simdjson_inline simd8<uint8_t> shr() const { return simd8<uint8_t>(_mm_srli_epi16(*this, N)) & uint8_t(0xFFu >> N); }
template<int N>
simdjson_inline simd8<uint8_t> shl() const { return simd8<uint8_t>(_mm_slli_epi16(*this, N)) & uint8_t(0xFFu << N); }
// Get one of the bits and make a bitmask out of it.
// e.g. value.get_bit<7>() gets the high bit
template<int N>
simdjson_inline int get_bit() const { return _mm_movemask_epi8(_mm_slli_epi16(*this, 7-N)); }
};
template<typename T>
struct simd8x64 {
static constexpr int NUM_CHUNKS = 64 / sizeof(simd8<T>);
static_assert(NUM_CHUNKS == 4, "Westmere kernel should use four registers per 64-byte block.");
const simd8<T> chunks[NUM_CHUNKS];
simd8x64(const simd8x64<T>& o) = delete; // no copy allowed
simd8x64<T>& operator=(const simd8<T>& other) = delete; // no assignment allowed
simd8x64() = delete; // no default constructor allowed
simdjson_inline simd8x64(const simd8<T> chunk0, const simd8<T> chunk1, const simd8<T> chunk2, const simd8<T> chunk3) : chunks{chunk0, chunk1, chunk2, chunk3} {}
simdjson_inline simd8x64(const T ptr[64]) : chunks{simd8<T>::load(ptr), simd8<T>::load(ptr+16), simd8<T>::load(ptr+32), simd8<T>::load(ptr+48)} {}
simdjson_inline void store(T ptr[64]) const {
this->chunks[0].store(ptr+sizeof(simd8<T>)*0);
this->chunks[1].store(ptr+sizeof(simd8<T>)*1);
this->chunks[2].store(ptr+sizeof(simd8<T>)*2);
this->chunks[3].store(ptr+sizeof(simd8<T>)*3);
}
simdjson_inline simd8<T> reduce_or() const {
return (this->chunks[0] | this->chunks[1]) | (this->chunks[2] | this->chunks[3]);
}
simdjson_inline uint64_t compress(uint64_t mask, T * output) const {
this->chunks[0].compress(uint16_t(mask), output);
this->chunks[1].compress(uint16_t(mask >> 16), output + 16 - count_ones(mask & 0xFFFF));
this->chunks[2].compress(uint16_t(mask >> 32), output + 32 - count_ones(mask & 0xFFFFFFFF));
this->chunks[3].compress(uint16_t(mask >> 48), output + 48 - count_ones(mask & 0xFFFFFFFFFFFF));
return 64 - count_ones(mask);
}
simdjson_inline uint64_t to_bitmask() const {
uint64_t r0 = uint32_t(this->chunks[0].to_bitmask() );
uint64_t r1 = this->chunks[1].to_bitmask() ;
uint64_t r2 = this->chunks[2].to_bitmask() ;
uint64_t r3 = this->chunks[3].to_bitmask() ;
return r0 | (r1 << 16) | (r2 << 32) | (r3 << 48);
}
simdjson_inline uint64_t eq(const T m) const {
const simd8<T> mask = simd8<T>::splat(m);
return simd8x64<bool>(
this->chunks[0] == mask,
this->chunks[1] == mask,
this->chunks[2] == mask,
this->chunks[3] == mask
).to_bitmask();
}
simdjson_inline uint64_t eq(const simd8x64<uint8_t> &other) const {
return simd8x64<bool>(
this->chunks[0] == other.chunks[0],
this->chunks[1] == other.chunks[1],
this->chunks[2] == other.chunks[2],
this->chunks[3] == other.chunks[3]
).to_bitmask();
}
simdjson_inline uint64_t lteq(const T m) const {
const simd8<T> mask = simd8<T>::splat(m);
return simd8x64<bool>(
this->chunks[0] <= mask,
this->chunks[1] <= mask,
this->chunks[2] <= mask,
this->chunks[3] <= mask
).to_bitmask();
}
}; // struct simd8x64<T>
} // namespace simd
} // unnamed namespace
} // namespace westmere
} // namespace simdjson
#endif // SIMDJSON_WESTMERE_SIMD_INPUT_H
/* end file simdjson/westmere/simd.h */
namespace simdjson {
namespace westmere {
namespace {
using namespace simd;
// Holds backslashes and quotes locations.
struct backslash_and_quote {
public:
static constexpr uint32_t BYTES_PROCESSED = 32;
simdjson_inline static backslash_and_quote copy_and_find(const uint8_t *src, uint8_t *dst);
simdjson_inline bool has_quote_first() { return ((bs_bits - 1) & quote_bits) != 0; }
simdjson_inline bool has_backslash() { return bs_bits != 0; }
simdjson_inline int quote_index() { return trailing_zeroes(quote_bits); }
simdjson_inline int backslash_index() { return trailing_zeroes(bs_bits); }
uint32_t bs_bits;
uint32_t quote_bits;
}; // struct backslash_and_quote
simdjson_inline backslash_and_quote backslash_and_quote::copy_and_find(const uint8_t *src, uint8_t *dst) {
// this can read up to 31 bytes beyond the buffer size, but we require
// SIMDJSON_PADDING of padding
static_assert(SIMDJSON_PADDING >= (BYTES_PROCESSED - 1), "backslash and quote finder must process fewer than SIMDJSON_PADDING bytes");
simd8<uint8_t> v0(src);
simd8<uint8_t> v1(src + 16);
v0.store(dst);
v1.store(dst + 16);
uint64_t bs_and_quote = simd8x64<bool>(v0 == '\\', v1 == '\\', v0 == '"', v1 == '"').to_bitmask();
return {
uint32_t(bs_and_quote), // bs_bits
uint32_t(bs_and_quote >> 32) // quote_bits
};
}
} // unnamed namespace
} // namespace westmere
} // namespace simdjson
#endif // SIMDJSON_WESTMERE_STRINGPARSING_DEFS_H
/* end file simdjson/westmere/stringparsing_defs.h */
/* end file simdjson/westmere/begin.h */
/* including simdjson/generic/amalgamated.h for westmere: #include "simdjson/generic/amalgamated.h" */
/* begin file simdjson/generic/amalgamated.h for westmere */
#if defined(SIMDJSON_CONDITIONAL_INCLUDE) && !defined(SIMDJSON_GENERIC_DEPENDENCIES_H)
#error simdjson/generic/dependencies.h must be included before simdjson/generic/amalgamated.h!
#endif
/* including simdjson/generic/base.h for westmere: #include "simdjson/generic/base.h" */
/* begin file simdjson/generic/base.h for westmere */
#ifndef SIMDJSON_GENERIC_BASE_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_GENERIC_BASE_H */
/* amalgamation skipped (editor-only): #include "simdjson/base.h" */
/* amalgamation skipped (editor-only): // If we haven't got an implementation yet, we're in the editor, editing a generic file! Just */
/* amalgamation skipped (editor-only): // use the most advanced one we can so the most possible stuff can be tested. */
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_IMPLEMENTATION */
/* amalgamation skipped (editor-only): #include "simdjson/implementation_detection.h" */
/* amalgamation skipped (editor-only): #if SIMDJSON_IMPLEMENTATION_ICELAKE */
/* amalgamation skipped (editor-only): #include "simdjson/icelake/begin.h" */
/* amalgamation skipped (editor-only): #elif SIMDJSON_IMPLEMENTATION_HASWELL */
/* amalgamation skipped (editor-only): #include "simdjson/haswell/begin.h" */
/* amalgamation skipped (editor-only): #elif SIMDJSON_IMPLEMENTATION_WESTMERE */
/* amalgamation skipped (editor-only): #include "simdjson/westmere/begin.h" */
/* amalgamation skipped (editor-only): #elif SIMDJSON_IMPLEMENTATION_ARM64 */
/* amalgamation skipped (editor-only): #include "simdjson/arm64/begin.h" */
/* amalgamation skipped (editor-only): #elif SIMDJSON_IMPLEMENTATION_PPC64 */
/* amalgamation skipped (editor-only): #include "simdjson/ppc64/begin.h" */
/* amalgamation skipped (editor-only): #elif SIMDJSON_IMPLEMENTATION_FALLBACK */
/* amalgamation skipped (editor-only): #include "simdjson/fallback/begin.h" */
/* amalgamation skipped (editor-only): #else */
/* amalgamation skipped (editor-only): #error "All possible implementations (including fallback) have been disabled! simdjson will not run." */
/* amalgamation skipped (editor-only): #endif */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_IMPLEMENTATION */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace westmere {
struct open_container;
class dom_parser_implementation;
/**
* The type of a JSON number
*/
enum class number_type {
floating_point_number=1, /// a binary64 number
signed_integer, /// a signed integer that fits in a 64-bit word using two's complement
unsigned_integer, /// a positive integer larger or equal to 1<<63
big_integer /// a big integer that does not fit in a 64-bit word
};
} // namespace westmere
} // namespace simdjson
#endif // SIMDJSON_GENERIC_BASE_H
/* end file simdjson/generic/base.h for westmere */
/* including simdjson/generic/jsoncharutils.h for westmere: #include "simdjson/generic/jsoncharutils.h" */
/* begin file simdjson/generic/jsoncharutils.h for westmere */
#ifndef SIMDJSON_GENERIC_JSONCHARUTILS_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_GENERIC_JSONCHARUTILS_H */
/* amalgamation skipped (editor-only): #include "simdjson/generic/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/jsoncharutils_tables.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/numberparsing_tables.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace westmere {
namespace {
namespace jsoncharutils {
// return non-zero if not a structural or whitespace char
// zero otherwise
simdjson_inline uint32_t is_not_structural_or_whitespace(uint8_t c) {
return internal::structural_or_whitespace_negated[c];
}
simdjson_inline uint32_t is_structural_or_whitespace(uint8_t c) {
return internal::structural_or_whitespace[c];
}
// returns a value with the high 16 bits set if not valid
// otherwise returns the conversion of the 4 hex digits at src into the bottom
// 16 bits of the 32-bit return register
//
// see
// https://lemire.me/blog/2019/04/17/parsing-short-hexadecimal-strings-efficiently/
static inline uint32_t hex_to_u32_nocheck(
const uint8_t *src) { // strictly speaking, static inline is a C-ism
uint32_t v1 = internal::digit_to_val32[630 + src[0]];
uint32_t v2 = internal::digit_to_val32[420 + src[1]];
uint32_t v3 = internal::digit_to_val32[210 + src[2]];
uint32_t v4 = internal::digit_to_val32[0 + src[3]];
return v1 | v2 | v3 | v4;
}
// given a code point cp, writes to c
// the utf-8 code, outputting the length in
// bytes, if the length is zero, the code point
// is invalid
//
// This can possibly be made faster using pdep
// and clz and table lookups, but JSON documents
// have few escaped code points, and the following
// function looks cheap.
//
// Note: we assume that surrogates are treated separately
//
simdjson_inline size_t codepoint_to_utf8(uint32_t cp, uint8_t *c) {
if (cp <= 0x7F) {
c[0] = uint8_t(cp);
return 1; // ascii
}
if (cp <= 0x7FF) {
c[0] = uint8_t((cp >> 6) + 192);
c[1] = uint8_t((cp & 63) + 128);
return 2; // universal plane
// Surrogates are treated elsewhere...
//} //else if (0xd800 <= cp && cp <= 0xdfff) {
// return 0; // surrogates // could put assert here
} else if (cp <= 0xFFFF) {
c[0] = uint8_t((cp >> 12) + 224);
c[1] = uint8_t(((cp >> 6) & 63) + 128);
c[2] = uint8_t((cp & 63) + 128);
return 3;
} else if (cp <= 0x10FFFF) { // if you know you have a valid code point, this
// is not needed
c[0] = uint8_t((cp >> 18) + 240);
c[1] = uint8_t(((cp >> 12) & 63) + 128);
c[2] = uint8_t(((cp >> 6) & 63) + 128);
c[3] = uint8_t((cp & 63) + 128);
return 4;
}
// will return 0 when the code point was too large.
return 0; // bad r
}
#if SIMDJSON_IS_32BITS // _umul128 for x86, arm
// this is a slow emulation routine for 32-bit
//
static simdjson_inline uint64_t __emulu(uint32_t x, uint32_t y) {
return x * (uint64_t)y;
}
static simdjson_inline uint64_t _umul128(uint64_t ab, uint64_t cd, uint64_t *hi) {
uint64_t ad = __emulu((uint32_t)(ab >> 32), (uint32_t)cd);
uint64_t bd = __emulu((uint32_t)ab, (uint32_t)cd);
uint64_t adbc = ad + __emulu((uint32_t)ab, (uint32_t)(cd >> 32));
uint64_t adbc_carry = !!(adbc < ad);
uint64_t lo = bd + (adbc << 32);
*hi = __emulu((uint32_t)(ab >> 32), (uint32_t)(cd >> 32)) + (adbc >> 32) +
(adbc_carry << 32) + !!(lo < bd);
return lo;
}
#endif
} // namespace jsoncharutils
} // unnamed namespace
} // namespace westmere
} // namespace simdjson
#endif // SIMDJSON_GENERIC_JSONCHARUTILS_H
/* end file simdjson/generic/jsoncharutils.h for westmere */
/* including simdjson/generic/atomparsing.h for westmere: #include "simdjson/generic/atomparsing.h" */
/* begin file simdjson/generic/atomparsing.h for westmere */
#ifndef SIMDJSON_GENERIC_ATOMPARSING_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_GENERIC_ATOMPARSING_H */
/* amalgamation skipped (editor-only): #include "simdjson/generic/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/generic/jsoncharutils.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#include <cstring>
namespace simdjson {
namespace westmere {
namespace {
/// @private
namespace atomparsing {
// The string_to_uint32 is exclusively used to map literal strings to 32-bit values.
// We use memcpy instead of a pointer cast to avoid undefined behaviors since we cannot
// be certain that the character pointer will be properly aligned.
// You might think that using memcpy makes this function expensive, but you'd be wrong.
// All decent optimizing compilers (GCC, clang, Visual Studio) will compile string_to_uint32("false");
// to the compile-time constant 1936482662.
simdjson_inline uint32_t string_to_uint32(const char* str) { uint32_t val; std::memcpy(&val, str, sizeof(uint32_t)); return val; }
// Again in str4ncmp we use a memcpy to avoid undefined behavior. The memcpy may appear expensive.
// Yet all decent optimizing compilers will compile memcpy to a single instruction, just about.
simdjson_warn_unused
simdjson_inline uint32_t str4ncmp(const uint8_t *src, const char* atom) {
uint32_t srcval; // we want to avoid unaligned 32-bit loads (undefined in C/C++)
static_assert(sizeof(uint32_t) <= SIMDJSON_PADDING, "SIMDJSON_PADDING must be larger than 4 bytes");
std::memcpy(&srcval, src, sizeof(uint32_t));
return srcval ^ string_to_uint32(atom);
}
simdjson_warn_unused
simdjson_inline bool is_valid_true_atom(const uint8_t *src) {
return (str4ncmp(src, "true") | jsoncharutils::is_not_structural_or_whitespace(src[4])) == 0;
}
simdjson_warn_unused
simdjson_inline bool is_valid_true_atom(const uint8_t *src, size_t len) {
if (len > 4) { return is_valid_true_atom(src); }
else if (len == 4) { return !str4ncmp(src, "true"); }
else { return false; }
}
simdjson_warn_unused
simdjson_inline bool is_valid_false_atom(const uint8_t *src) {
return (str4ncmp(src+1, "alse") | jsoncharutils::is_not_structural_or_whitespace(src[5])) == 0;
}
simdjson_warn_unused
simdjson_inline bool is_valid_false_atom(const uint8_t *src, size_t len) {
if (len > 5) { return is_valid_false_atom(src); }
else if (len == 5) { return !str4ncmp(src+1, "alse"); }
else { return false; }
}
simdjson_warn_unused
simdjson_inline bool is_valid_null_atom(const uint8_t *src) {
return (str4ncmp(src, "null") | jsoncharutils::is_not_structural_or_whitespace(src[4])) == 0;
}
simdjson_warn_unused
simdjson_inline bool is_valid_null_atom(const uint8_t *src, size_t len) {
if (len > 4) { return is_valid_null_atom(src); }
else if (len == 4) { return !str4ncmp(src, "null"); }
else { return false; }
}
} // namespace atomparsing
} // unnamed namespace
} // namespace westmere
} // namespace simdjson
#endif // SIMDJSON_GENERIC_ATOMPARSING_H
/* end file simdjson/generic/atomparsing.h for westmere */
/* including simdjson/generic/dom_parser_implementation.h for westmere: #include "simdjson/generic/dom_parser_implementation.h" */
/* begin file simdjson/generic/dom_parser_implementation.h for westmere */
#ifndef SIMDJSON_GENERIC_DOM_PARSER_IMPLEMENTATION_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_GENERIC_DOM_PARSER_IMPLEMENTATION_H */
/* amalgamation skipped (editor-only): #include "simdjson/generic/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/dom_parser_implementation.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace westmere {
// expectation: sizeof(open_container) = 64/8.
struct open_container {
uint32_t tape_index; // where, on the tape, does the scope ([,{) begins
uint32_t count; // how many elements in the scope
}; // struct open_container
static_assert(sizeof(open_container) == 64/8, "Open container must be 64 bits");
class dom_parser_implementation final : public internal::dom_parser_implementation {
public:
/** Tape location of each open { or [ */
std::unique_ptr<open_container[]> open_containers{};
/** Whether each open container is a [ or { */
std::unique_ptr<bool[]> is_array{};
/** Buffer passed to stage 1 */
const uint8_t *buf{};
/** Length passed to stage 1 */
size_t len{0};
/** Document passed to stage 2 */
dom::document *doc{};
inline dom_parser_implementation() noexcept;
inline dom_parser_implementation(dom_parser_implementation &&other) noexcept;
inline dom_parser_implementation &operator=(dom_parser_implementation &&other) noexcept;
dom_parser_implementation(const dom_parser_implementation &) = delete;
dom_parser_implementation &operator=(const dom_parser_implementation &) = delete;
simdjson_warn_unused error_code parse(const uint8_t *buf, size_t len, dom::document &doc) noexcept final;
simdjson_warn_unused error_code stage1(const uint8_t *buf, size_t len, stage1_mode partial) noexcept final;
simdjson_warn_unused error_code stage2(dom::document &doc) noexcept final;
simdjson_warn_unused error_code stage2_next(dom::document &doc) noexcept final;
simdjson_warn_unused uint8_t *parse_string(const uint8_t *src, uint8_t *dst, bool allow_replacement) const noexcept final;
simdjson_warn_unused uint8_t *parse_wobbly_string(const uint8_t *src, uint8_t *dst) const noexcept final;
inline simdjson_warn_unused error_code set_capacity(size_t capacity) noexcept final;
inline simdjson_warn_unused error_code set_max_depth(size_t max_depth) noexcept final;
private:
simdjson_inline simdjson_warn_unused error_code set_capacity_stage1(size_t capacity);
};
} // namespace westmere
} // namespace simdjson
namespace simdjson {
namespace westmere {
inline dom_parser_implementation::dom_parser_implementation() noexcept = default;
inline dom_parser_implementation::dom_parser_implementation(dom_parser_implementation &&other) noexcept = default;
inline dom_parser_implementation &dom_parser_implementation::operator=(dom_parser_implementation &&other) noexcept = default;
// Leaving these here so they can be inlined if so desired
inline simdjson_warn_unused error_code dom_parser_implementation::set_capacity(size_t capacity) noexcept {
if(capacity > SIMDJSON_MAXSIZE_BYTES) { return CAPACITY; }
// Stage 1 index output
size_t max_structures = SIMDJSON_ROUNDUP_N(capacity, 64) + 2 + 7;
structural_indexes.reset( new (std::nothrow) uint32_t[max_structures] );
if (!structural_indexes) { _capacity = 0; return MEMALLOC; }
structural_indexes[0] = 0;
n_structural_indexes = 0;
_capacity = capacity;
return SUCCESS;
}
inline simdjson_warn_unused error_code dom_parser_implementation::set_max_depth(size_t max_depth) noexcept {
// Stage 2 stacks
open_containers.reset(new (std::nothrow) open_container[max_depth]);
is_array.reset(new (std::nothrow) bool[max_depth]);
if (!is_array || !open_containers) { _max_depth = 0; return MEMALLOC; }
_max_depth = max_depth;
return SUCCESS;
}
} // namespace westmere
} // namespace simdjson
#endif // SIMDJSON_GENERIC_DOM_PARSER_IMPLEMENTATION_H
/* end file simdjson/generic/dom_parser_implementation.h for westmere */
/* including simdjson/generic/implementation_simdjson_result_base.h for westmere: #include "simdjson/generic/implementation_simdjson_result_base.h" */
/* begin file simdjson/generic/implementation_simdjson_result_base.h for westmere */
#ifndef SIMDJSON_GENERIC_IMPLEMENTATION_SIMDJSON_RESULT_BASE_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_GENERIC_IMPLEMENTATION_SIMDJSON_RESULT_BASE_H */
/* amalgamation skipped (editor-only): #include "simdjson/generic/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace westmere {
// This is a near copy of include/error.h's implementation_simdjson_result_base, except it doesn't use std::pair
// so we can avoid inlining errors
// TODO reconcile these!
/**
* The result of a simdjson operation that could fail.
*
* Gives the option of reading error codes, or throwing an exception by casting to the desired result.
*
* This is a base class for implementations that want to add functions to the result type for
* chaining.
*
* Override like:
*
* struct simdjson_result<T> : public internal::implementation_simdjson_result_base<T> {
* simdjson_result() noexcept : internal::implementation_simdjson_result_base<T>() {}
* simdjson_result(error_code error) noexcept : internal::implementation_simdjson_result_base<T>(error) {}
* simdjson_result(T &&value) noexcept : internal::implementation_simdjson_result_base<T>(std::forward(value)) {}
* simdjson_result(T &&value, error_code error) noexcept : internal::implementation_simdjson_result_base<T>(value, error) {}
* // Your extra methods here
* }
*
* Then any method returning simdjson_result<T> will be chainable with your methods.
*/
template<typename T>
struct implementation_simdjson_result_base {
/**
* Create a new empty result with error = UNINITIALIZED.
*/
simdjson_inline implementation_simdjson_result_base() noexcept = default;
/**
* Create a new error result.
*/
simdjson_inline implementation_simdjson_result_base(error_code error) noexcept;
/**
* Create a new successful result.
*/
simdjson_inline implementation_simdjson_result_base(T &&value) noexcept;
/**
* Create a new result with both things (use if you don't want to branch when creating the result).
*/
simdjson_inline implementation_simdjson_result_base(T &&value, error_code error) noexcept;
/**
* Move the value and the error to the provided variables.
*
* @param value The variable to assign the value to. May not be set if there is an error.
* @param error The variable to assign the error to. Set to SUCCESS if there is no error.
*/
simdjson_inline void tie(T &value, error_code &error) && noexcept;
/**
* Move the value to the provided variable.
*
* @param value The variable to assign the value to. May not be set if there is an error.
*/
simdjson_inline error_code get(T &value) && noexcept;
/**
* The error.
*/
simdjson_inline error_code error() const noexcept;
#if SIMDJSON_EXCEPTIONS
/**
* Get the result value.
*
* @throw simdjson_error if there was an error.
*/
simdjson_inline T& value() & noexcept(false);
/**
* Take the result value (move it).
*
* @throw simdjson_error if there was an error.
*/
simdjson_inline T&& value() && noexcept(false);
/**
* Take the result value (move it).
*
* @throw simdjson_error if there was an error.
*/
simdjson_inline T&& take_value() && noexcept(false);
/**
* Cast to the value (will throw on error).
*
* @throw simdjson_error if there was an error.
*/
simdjson_inline operator T&&() && noexcept(false);
#endif // SIMDJSON_EXCEPTIONS
/**
* Get the result value. This function is safe if and only
* the error() method returns a value that evaluates to false.
*/
simdjson_inline const T& value_unsafe() const& noexcept;
/**
* Get the result value. This function is safe if and only
* the error() method returns a value that evaluates to false.
*/
simdjson_inline T& value_unsafe() & noexcept;
/**
* Take the result value (move it). This function is safe if and only
* the error() method returns a value that evaluates to false.
*/
simdjson_inline T&& value_unsafe() && noexcept;
protected:
/** users should never directly access first and second. **/
T first{}; /** Users should never directly access 'first'. **/
error_code second{UNINITIALIZED}; /** Users should never directly access 'second'. **/
}; // struct implementation_simdjson_result_base
} // namespace westmere
} // namespace simdjson
#endif // SIMDJSON_GENERIC_IMPLEMENTATION_SIMDJSON_RESULT_BASE_H
/* end file simdjson/generic/implementation_simdjson_result_base.h for westmere */
/* including simdjson/generic/numberparsing.h for westmere: #include "simdjson/generic/numberparsing.h" */
/* begin file simdjson/generic/numberparsing.h for westmere */
#ifndef SIMDJSON_GENERIC_NUMBERPARSING_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_GENERIC_NUMBERPARSING_H */
/* amalgamation skipped (editor-only): #include "simdjson/generic/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/generic/jsoncharutils.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/numberparsing_tables.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#include <limits>
#include <ostream>
#include <cstring>
namespace simdjson {
namespace westmere {
namespace numberparsing {
#ifdef JSON_TEST_NUMBERS
#define INVALID_NUMBER(SRC) (found_invalid_number((SRC)), NUMBER_ERROR)
#define WRITE_INTEGER(VALUE, SRC, WRITER) (found_integer((VALUE), (SRC)), (WRITER).append_s64((VALUE)))
#define WRITE_UNSIGNED(VALUE, SRC, WRITER) (found_unsigned_integer((VALUE), (SRC)), (WRITER).append_u64((VALUE)))
#define WRITE_DOUBLE(VALUE, SRC, WRITER) (found_float((VALUE), (SRC)), (WRITER).append_double((VALUE)))
#define BIGINT_NUMBER(SRC) (found_invalid_number((SRC)), BIGINT_ERROR)
#else
#define INVALID_NUMBER(SRC) (NUMBER_ERROR)
#define WRITE_INTEGER(VALUE, SRC, WRITER) (WRITER).append_s64((VALUE))
#define WRITE_UNSIGNED(VALUE, SRC, WRITER) (WRITER).append_u64((VALUE))
#define WRITE_DOUBLE(VALUE, SRC, WRITER) (WRITER).append_double((VALUE))
#define BIGINT_NUMBER(SRC) (BIGINT_ERROR)
#endif
namespace {
// Convert a mantissa, an exponent and a sign bit into an ieee64 double.
// The real_exponent needs to be in [0, 2046] (technically real_exponent = 2047 would be acceptable).
// The mantissa should be in [0,1<<53). The bit at index (1ULL << 52) while be zeroed.
simdjson_inline double to_double(uint64_t mantissa, uint64_t real_exponent, bool negative) {
double d;
mantissa &= ~(1ULL << 52);
mantissa |= real_exponent << 52;
mantissa |= ((static_cast<uint64_t>(negative)) << 63);
std::memcpy(&d, &mantissa, sizeof(d));
return d;
}
// Attempts to compute i * 10^(power) exactly; and if "negative" is
// true, negate the result.
// This function will only work in some cases, when it does not work, success is
// set to false. This should work *most of the time* (like 99% of the time).
// We assume that power is in the [smallest_power,
// largest_power] interval: the caller is responsible for this check.
simdjson_inline bool compute_float_64(int64_t power, uint64_t i, bool negative, double &d) {
// we start with a fast path
// It was described in
// Clinger WD. How to read floating point numbers accurately.
// ACM SIGPLAN Notices. 1990
#ifndef FLT_EVAL_METHOD
#error "FLT_EVAL_METHOD should be defined, please include cfloat."
#endif
#if (FLT_EVAL_METHOD != 1) && (FLT_EVAL_METHOD != 0)
// We cannot be certain that x/y is rounded to nearest.
if (0 <= power && power <= 22 && i <= 9007199254740991)
#else
if (-22 <= power && power <= 22 && i <= 9007199254740991)
#endif
{
// convert the integer into a double. This is lossless since
// 0 <= i <= 2^53 - 1.
d = double(i);
//
// The general idea is as follows.
// If 0 <= s < 2^53 and if 10^0 <= p <= 10^22 then
// 1) Both s and p can be represented exactly as 64-bit floating-point
// values
// (binary64).
// 2) Because s and p can be represented exactly as floating-point values,
// then s * p
// and s / p will produce correctly rounded values.
//
if (power < 0) {
d = d / simdjson::internal::power_of_ten[-power];
} else {
d = d * simdjson::internal::power_of_ten[power];
}
if (negative) {
d = -d;
}
return true;
}
// When 22 < power && power < 22 + 16, we could
// hope for another, secondary fast path. It was
// described by David M. Gay in "Correctly rounded
// binary-decimal and decimal-binary conversions." (1990)
// If you need to compute i * 10^(22 + x) for x < 16,
// first compute i * 10^x, if you know that result is exact
// (e.g., when i * 10^x < 2^53),
// then you can still proceed and do (i * 10^x) * 10^22.
// Is this worth your time?
// You need 22 < power *and* power < 22 + 16 *and* (i * 10^(x-22) < 2^53)
// for this second fast path to work.
// If you you have 22 < power *and* power < 22 + 16, and then you
// optimistically compute "i * 10^(x-22)", there is still a chance that you
// have wasted your time if i * 10^(x-22) >= 2^53. It makes the use cases of
// this optimization maybe less common than we would like. Source:
// http://www.exploringbinary.com/fast-path-decimal-to-floating-point-conversion/
// also used in RapidJSON: https://rapidjson.org/strtod_8h_source.html
// The fast path has now failed, so we are failing back on the slower path.
// In the slow path, we need to adjust i so that it is > 1<<63 which is always
// possible, except if i == 0, so we handle i == 0 separately.
if(i == 0) {
d = negative ? -0.0 : 0.0;
return true;
}
// The exponent is 1024 + 63 + power
// + floor(log(5**power)/log(2)).
// The 1024 comes from the ieee64 standard.
// The 63 comes from the fact that we use a 64-bit word.
//
// Computing floor(log(5**power)/log(2)) could be
// slow. Instead we use a fast function.
//
// For power in (-400,350), we have that
// (((152170 + 65536) * power ) >> 16);
// is equal to
// floor(log(5**power)/log(2)) + power when power >= 0
// and it is equal to
// ceil(log(5**-power)/log(2)) + power when power < 0
//
// The 65536 is (1<<16) and corresponds to
// (65536 * power) >> 16 ---> power
//
// ((152170 * power ) >> 16) is equal to
// floor(log(5**power)/log(2))
//
// Note that this is not magic: 152170/(1<<16) is
// approximatively equal to log(5)/log(2).
// The 1<<16 value is a power of two; we could use a
// larger power of 2 if we wanted to.
//
int64_t exponent = (((152170 + 65536) * power) >> 16) + 1024 + 63;
// We want the most significant bit of i to be 1. Shift if needed.
int lz = leading_zeroes(i);
i <<= lz;
// We are going to need to do some 64-bit arithmetic to get a precise product.
// We use a table lookup approach.
// It is safe because
// power >= smallest_power
// and power <= largest_power
// We recover the mantissa of the power, it has a leading 1. It is always
// rounded down.
//
// We want the most significant 64 bits of the product. We know
// this will be non-zero because the most significant bit of i is
// 1.
const uint32_t index = 2 * uint32_t(power - simdjson::internal::smallest_power);
// Optimization: It may be that materializing the index as a variable might confuse some compilers and prevent effective complex-addressing loads. (Done for code clarity.)
//
// The full_multiplication function computes the 128-bit product of two 64-bit words
// with a returned value of type value128 with a "low component" corresponding to the
// 64-bit least significant bits of the product and with a "high component" corresponding
// to the 64-bit most significant bits of the product.
simdjson::internal::value128 firstproduct = full_multiplication(i, simdjson::internal::power_of_five_128[index]);
// Both i and power_of_five_128[index] have their most significant bit set to 1 which
// implies that the either the most or the second most significant bit of the product
// is 1. We pack values in this manner for efficiency reasons: it maximizes the use
// we make of the product. It also makes it easy to reason about the product: there
// is 0 or 1 leading zero in the product.
// Unless the least significant 9 bits of the high (64-bit) part of the full
// product are all 1s, then we know that the most significant 55 bits are
// exact and no further work is needed. Having 55 bits is necessary because
// we need 53 bits for the mantissa but we have to have one rounding bit and
// we can waste a bit if the most significant bit of the product is zero.
if((firstproduct.high & 0x1FF) == 0x1FF) {
// We want to compute i * 5^q, but only care about the top 55 bits at most.
// Consider the scenario where q>=0. Then 5^q may not fit in 64-bits. Doing
// the full computation is wasteful. So we do what is called a "truncated
// multiplication".
// We take the most significant 64-bits, and we put them in
// power_of_five_128[index]. Usually, that's good enough to approximate i * 5^q
// to the desired approximation using one multiplication. Sometimes it does not suffice.
// Then we store the next most significant 64 bits in power_of_five_128[index + 1], and
// then we get a better approximation to i * 5^q.
//
// That's for when q>=0. The logic for q<0 is somewhat similar but it is somewhat
// more complicated.
//
// There is an extra layer of complexity in that we need more than 55 bits of
// accuracy in the round-to-even scenario.
//
// The full_multiplication function computes the 128-bit product of two 64-bit words
// with a returned value of type value128 with a "low component" corresponding to the
// 64-bit least significant bits of the product and with a "high component" corresponding
// to the 64-bit most significant bits of the product.
simdjson::internal::value128 secondproduct = full_multiplication(i, simdjson::internal::power_of_five_128[index + 1]);
firstproduct.low += secondproduct.high;
if(secondproduct.high > firstproduct.low) { firstproduct.high++; }
// As it has been proven by Noble Mushtak and Daniel Lemire in "Fast Number Parsing Without
// Fallback" (https://arxiv.org/abs/2212.06644), at this point we are sure that the product
// is sufficiently accurate, and more computation is not needed.
}
uint64_t lower = firstproduct.low;
uint64_t upper = firstproduct.high;
// The final mantissa should be 53 bits with a leading 1.
// We shift it so that it occupies 54 bits with a leading 1.
///////
uint64_t upperbit = upper >> 63;
uint64_t mantissa = upper >> (upperbit + 9);
lz += int(1 ^ upperbit);
// Here we have mantissa < (1<<54).
int64_t real_exponent = exponent - lz;
if (simdjson_unlikely(real_exponent <= 0)) { // we have a subnormal?
// Here have that real_exponent <= 0 so -real_exponent >= 0
if(-real_exponent + 1 >= 64) { // if we have more than 64 bits below the minimum exponent, you have a zero for sure.
d = negative ? -0.0 : 0.0;
return true;
}
// next line is safe because -real_exponent + 1 < 0
mantissa >>= -real_exponent + 1;
// Thankfully, we can't have both "round-to-even" and subnormals because
// "round-to-even" only occurs for powers close to 0.
mantissa += (mantissa & 1); // round up
mantissa >>= 1;
// There is a weird scenario where we don't have a subnormal but just.
// Suppose we start with 2.2250738585072013e-308, we end up
// with 0x3fffffffffffff x 2^-1023-53 which is technically subnormal
// whereas 0x40000000000000 x 2^-1023-53 is normal. Now, we need to round
// up 0x3fffffffffffff x 2^-1023-53 and once we do, we are no longer
// subnormal, but we can only know this after rounding.
// So we only declare a subnormal if we are smaller than the threshold.
real_exponent = (mantissa < (uint64_t(1) << 52)) ? 0 : 1;
d = to_double(mantissa, real_exponent, negative);
return true;
}
// We have to round to even. The "to even" part
// is only a problem when we are right in between two floats
// which we guard against.
// If we have lots of trailing zeros, we may fall right between two
// floating-point values.
//
// The round-to-even cases take the form of a number 2m+1 which is in (2^53,2^54]
// times a power of two. That is, it is right between a number with binary significand
// m and another number with binary significand m+1; and it must be the case
// that it cannot be represented by a float itself.
//
// We must have that w * 10 ^q == (2m+1) * 2^p for some power of two 2^p.
// Recall that 10^q = 5^q * 2^q.
// When q >= 0, we must have that (2m+1) is divible by 5^q, so 5^q <= 2^54. We have that
// 5^23 <= 2^54 and it is the last power of five to qualify, so q <= 23.
// When q<0, we have w >= (2m+1) x 5^{-q}. We must have that w<2^{64} so
// (2m+1) x 5^{-q} < 2^{64}. We have that 2m+1>2^{53}. Hence, we must have
// 2^{53} x 5^{-q} < 2^{64}.
// Hence we have 5^{-q} < 2^{11}$ or q>= -4.
//
// We require lower <= 1 and not lower == 0 because we could not prove that
// that lower == 0 is implied; but we could prove that lower <= 1 is a necessary and sufficient test.
if (simdjson_unlikely((lower <= 1) && (power >= -4) && (power <= 23) && ((mantissa & 3) == 1))) {
if((mantissa << (upperbit + 64 - 53 - 2)) == upper) {
mantissa &= ~1; // flip it so that we do not round up
}
}
mantissa += mantissa & 1;
mantissa >>= 1;
// Here we have mantissa < (1<<53), unless there was an overflow
if (mantissa >= (1ULL << 53)) {
//////////
// This will happen when parsing values such as 7.2057594037927933e+16
////////
mantissa = (1ULL << 52);
real_exponent++;
}
mantissa &= ~(1ULL << 52);
// we have to check that real_exponent is in range, otherwise we bail out
if (simdjson_unlikely(real_exponent > 2046)) {
// We have an infinite value!!! We could actually throw an error here if we could.
return false;
}
d = to_double(mantissa, real_exponent, negative);
return true;
}
// We call a fallback floating-point parser that might be slow. Note
// it will accept JSON numbers, but the JSON spec. is more restrictive so
// before you call parse_float_fallback, you need to have validated the input
// string with the JSON grammar.
// It will return an error (false) if the parsed number is infinite.
// The string parsing itself always succeeds. We know that there is at least
// one digit.
static bool parse_float_fallback(const uint8_t *ptr, double *outDouble) {
*outDouble = simdjson::internal::from_chars(reinterpret_cast<const char *>(ptr));
// We do not accept infinite values.
// Detecting finite values in a portable manner is ridiculously hard, ideally
// we would want to do:
// return !std::isfinite(*outDouble);
// but that mysteriously fails under legacy/old libc++ libraries, see
// https://github.com/simdjson/simdjson/issues/1286
//
// Therefore, fall back to this solution (the extra parens are there
// to handle that max may be a macro on windows).
return !(*outDouble > (std::numeric_limits<double>::max)() || *outDouble < std::numeric_limits<double>::lowest());
}
static bool parse_float_fallback(const uint8_t *ptr, const uint8_t *end_ptr, double *outDouble) {
*outDouble = simdjson::internal::from_chars(reinterpret_cast<const char *>(ptr), reinterpret_cast<const char *>(end_ptr));
// We do not accept infinite values.
// Detecting finite values in a portable manner is ridiculously hard, ideally
// we would want to do:
// return !std::isfinite(*outDouble);
// but that mysteriously fails under legacy/old libc++ libraries, see
// https://github.com/simdjson/simdjson/issues/1286
//
// Therefore, fall back to this solution (the extra parens are there
// to handle that max may be a macro on windows).
return !(*outDouble > (std::numeric_limits<double>::max)() || *outDouble < std::numeric_limits<double>::lowest());
}
// check quickly whether the next 8 chars are made of digits
// at a glance, it looks better than Mula's
// http://0x80.pl/articles/swar-digits-validate.html
simdjson_inline bool is_made_of_eight_digits_fast(const uint8_t *chars) {
uint64_t val;
// this can read up to 7 bytes beyond the buffer size, but we require
// SIMDJSON_PADDING of padding
static_assert(7 <= SIMDJSON_PADDING, "SIMDJSON_PADDING must be bigger than 7");
std::memcpy(&val, chars, 8);
// a branchy method might be faster:
// return (( val & 0xF0F0F0F0F0F0F0F0 ) == 0x3030303030303030)
// && (( (val + 0x0606060606060606) & 0xF0F0F0F0F0F0F0F0 ) ==
// 0x3030303030303030);
return (((val & 0xF0F0F0F0F0F0F0F0) |
(((val + 0x0606060606060606) & 0xF0F0F0F0F0F0F0F0) >> 4)) ==
0x3333333333333333);
}
template<typename I>
SIMDJSON_NO_SANITIZE_UNDEFINED // We deliberately allow overflow here and check later
simdjson_inline bool parse_digit(const uint8_t c, I &i) {
const uint8_t digit = static_cast<uint8_t>(c - '0');
if (digit > 9) {
return false;
}
// PERF NOTE: multiplication by 10 is cheaper than arbitrary integer multiplication
i = 10 * i + digit; // might overflow, we will handle the overflow later
return true;
}
simdjson_inline bool is_digit(const uint8_t c) {
return static_cast<uint8_t>(c - '0') <= 9;
}
simdjson_inline error_code parse_decimal_after_separator(simdjson_unused const uint8_t *const src, const uint8_t *&p, uint64_t &i, int64_t &exponent) {
// we continue with the fiction that we have an integer. If the
// floating point number is representable as x * 10^z for some integer
// z that fits in 53 bits, then we will be able to convert back the
// the integer into a float in a lossless manner.
const uint8_t *const first_after_period = p;
#ifdef SIMDJSON_SWAR_NUMBER_PARSING
#if SIMDJSON_SWAR_NUMBER_PARSING
// this helps if we have lots of decimals!
// this turns out to be frequent enough.
if (is_made_of_eight_digits_fast(p)) {
i = i * 100000000 + parse_eight_digits_unrolled(p);
p += 8;
}
#endif // SIMDJSON_SWAR_NUMBER_PARSING
#endif // #ifdef SIMDJSON_SWAR_NUMBER_PARSING
// Unrolling the first digit makes a small difference on some implementations (e.g. westmere)
if (parse_digit(*p, i)) { ++p; }
while (parse_digit(*p, i)) { p++; }
exponent = first_after_period - p;
// Decimal without digits (123.) is illegal
if (exponent == 0) {
return INVALID_NUMBER(src);
}
return SUCCESS;
}
simdjson_inline error_code parse_exponent(simdjson_unused const uint8_t *const src, const uint8_t *&p, int64_t &exponent) {
// Exp Sign: -123.456e[-]78
bool neg_exp = ('-' == *p);
if (neg_exp || '+' == *p) { p++; } // Skip + as well
// Exponent: -123.456e-[78]
auto start_exp = p;
int64_t exp_number = 0;
while (parse_digit(*p, exp_number)) { ++p; }
// It is possible for parse_digit to overflow.
// In particular, it could overflow to INT64_MIN, and we cannot do - INT64_MIN.
// Thus we *must* check for possible overflow before we negate exp_number.
// Performance notes: it may seem like combining the two "simdjson_unlikely checks" below into
// a single simdjson_unlikely path would be faster. The reasoning is sound, but the compiler may
// not oblige and may, in fact, generate two distinct paths in any case. It might be
// possible to do uint64_t(p - start_exp - 1) >= 18 but it could end up trading off
// instructions for a simdjson_likely branch, an unconclusive gain.
// If there were no digits, it's an error.
if (simdjson_unlikely(p == start_exp)) {
return INVALID_NUMBER(src);
}
// We have a valid positive exponent in exp_number at this point, except that
// it may have overflowed.
// If there were more than 18 digits, we may have overflowed the integer. We have to do
// something!!!!
if (simdjson_unlikely(p > start_exp+18)) {
// Skip leading zeroes: 1e000000000000000000001 is technically valid and does not overflow
while (*start_exp == '0') { start_exp++; }
// 19 digits could overflow int64_t and is kind of absurd anyway. We don't
// support exponents smaller than -999,999,999,999,999,999 and bigger
// than 999,999,999,999,999,999.
// We can truncate.
// Note that 999999999999999999 is assuredly too large. The maximal ieee64 value before
// infinity is ~1.8e308. The smallest subnormal is ~5e-324. So, actually, we could
// truncate at 324.
// Note that there is no reason to fail per se at this point in time.
// E.g., 0e999999999999999999999 is a fine number.
if (p > start_exp+18) { exp_number = 999999999999999999; }
}
// At this point, we know that exp_number is a sane, positive, signed integer.
// It is <= 999,999,999,999,999,999. As long as 'exponent' is in
// [-8223372036854775808, 8223372036854775808], we won't overflow. Because 'exponent'
// is bounded in magnitude by the size of the JSON input, we are fine in this universe.
// To sum it up: the next line should never overflow.
exponent += (neg_exp ? -exp_number : exp_number);
return SUCCESS;
}
simdjson_inline bool check_if_integer(const uint8_t *const src, size_t max_length) {
const uint8_t *const srcend = src + max_length;
bool negative = (*src == '-'); // we can always read at least one character after the '-'
const uint8_t *p = src + uint8_t(negative);
if(p == srcend) { return false; }
if(*p == '0') {
++p;
if(p == srcend) { return true; }
if(jsoncharutils::is_not_structural_or_whitespace(*p)) { return false; }
return true;
}
while(p != srcend && is_digit(*p)) { ++p; }
if(p == srcend) { return true; }
if(jsoncharutils::is_not_structural_or_whitespace(*p)) { return false; }
return true;
}
simdjson_inline size_t significant_digits(const uint8_t * start_digits, size_t digit_count) {
// It is possible that the integer had an overflow.
// We have to handle the case where we have 0.0000somenumber.
const uint8_t *start = start_digits;
while ((*start == '0') || (*start == '.')) { ++start; }
// we over-decrement by one when there is a '.'
return digit_count - size_t(start - start_digits);
}
} // unnamed namespace
/** @private */
static error_code slow_float_parsing(simdjson_unused const uint8_t * src, double* answer) {
if (parse_float_fallback(src, answer)) {
return SUCCESS;
}
return INVALID_NUMBER(src);
}
/** @private */
template<typename W>
simdjson_inline error_code write_float(const uint8_t *const src, bool negative, uint64_t i, const uint8_t * start_digits, size_t digit_count, int64_t exponent, W &writer) {
// If we frequently had to deal with long strings of digits,
// we could extend our code by using a 128-bit integer instead
// of a 64-bit integer. However, this is uncommon in practice.
//
// 9999999999999999999 < 2**64 so we can accommodate 19 digits.
// If we have a decimal separator, then digit_count - 1 is the number of digits, but we
// may not have a decimal separator!
if (simdjson_unlikely(digit_count > 19 && significant_digits(start_digits, digit_count) > 19)) {
// Ok, chances are good that we had an overflow!
// this is almost never going to get called!!!
// we start anew, going slowly!!!
// This will happen in the following examples:
// 10000000000000000000000000000000000000000000e+308
// 3.1415926535897932384626433832795028841971693993751
//
// NOTE: We do not pass a reference to the to slow_float_parsing. If we passed our writer
// reference to it, it would force it to be stored in memory, preventing the compiler from
// picking it apart and putting into registers. i.e. if we pass it as reference,
// it gets slow.
double d;
error_code error = slow_float_parsing(src, &d);
writer.append_double(d);
return error;
}
// NOTE: it's weird that the simdjson_unlikely() only wraps half the if, but it seems to get slower any other
// way we've tried: https://github.com/simdjson/simdjson/pull/990#discussion_r448497331
// To future reader: we'd love if someone found a better way, or at least could explain this result!
if (simdjson_unlikely(exponent < simdjson::internal::smallest_power) || (exponent > simdjson::internal::largest_power)) {
//
// Important: smallest_power is such that it leads to a zero value.
// Observe that 18446744073709551615e-343 == 0, i.e. (2**64 - 1) e -343 is zero
// so something x 10^-343 goes to zero, but not so with something x 10^-342.
static_assert(simdjson::internal::smallest_power <= -342, "smallest_power is not small enough");
//
if((exponent < simdjson::internal::smallest_power) || (i == 0)) {
// E.g. Parse "-0.0e-999" into the same value as "-0.0". See https://en.wikipedia.org/wiki/Signed_zero
WRITE_DOUBLE(negative ? -0.0 : 0.0, src, writer);
return SUCCESS;
} else { // (exponent > largest_power) and (i != 0)
// We have, for sure, an infinite value and simdjson refuses to parse infinite values.
return INVALID_NUMBER(src);
}
}
double d;
if (!compute_float_64(exponent, i, negative, d)) {
// we are almost never going to get here.
if (!parse_float_fallback(src, &d)) { return INVALID_NUMBER(src); }
}
WRITE_DOUBLE(d, src, writer);
return SUCCESS;
}
// parse the number at src
// define JSON_TEST_NUMBERS for unit testing
//
// It is assumed that the number is followed by a structural ({,},],[) character
// or a white space character. If that is not the case (e.g., when the JSON
// document is made of a single number), then it is necessary to copy the
// content and append a space before calling this function.
//
// Our objective is accurate parsing (ULP of 0) at high speed.
template<typename W>
simdjson_inline error_code parse_number(const uint8_t *const src, W &writer);
// for performance analysis, it is sometimes useful to skip parsing
#ifdef SIMDJSON_SKIPNUMBERPARSING
template<typename W>
simdjson_inline error_code parse_number(const uint8_t *const, W &writer) {
writer.append_s64(0); // always write zero
return SUCCESS; // always succeeds
}
simdjson_unused simdjson_inline simdjson_result<uint64_t> parse_unsigned(const uint8_t * const src) noexcept { return 0; }
simdjson_unused simdjson_inline simdjson_result<int64_t> parse_integer(const uint8_t * const src) noexcept { return 0; }
simdjson_unused simdjson_inline simdjson_result<double> parse_double(const uint8_t * const src) noexcept { return 0; }
simdjson_unused simdjson_inline simdjson_result<uint64_t> parse_unsigned_in_string(const uint8_t * const src) noexcept { return 0; }
simdjson_unused simdjson_inline simdjson_result<int64_t> parse_integer_in_string(const uint8_t * const src) noexcept { return 0; }
simdjson_unused simdjson_inline simdjson_result<double> parse_double_in_string(const uint8_t * const src) noexcept { return 0; }
simdjson_unused simdjson_inline bool is_negative(const uint8_t * src) noexcept { return false; }
simdjson_unused simdjson_inline simdjson_result<bool> is_integer(const uint8_t * src) noexcept { return false; }
simdjson_unused simdjson_inline simdjson_result<number_type> get_number_type(const uint8_t * src) noexcept { return number_type::signed_integer; }
#else
// parse the number at src
// define JSON_TEST_NUMBERS for unit testing
//
// It is assumed that the number is followed by a structural ({,},],[) character
// or a white space character. If that is not the case (e.g., when the JSON
// document is made of a single number), then it is necessary to copy the
// content and append a space before calling this function.
//
// Our objective is accurate parsing (ULP of 0) at high speed.
template<typename W>
simdjson_inline error_code parse_number(const uint8_t *const src, W &writer) {
//
// Check for minus sign
//
bool negative = (*src == '-');
const uint8_t *p = src + uint8_t(negative);
//
// Parse the integer part.
//
// PERF NOTE: we don't use is_made_of_eight_digits_fast because large integers like 123456789 are rare
const uint8_t *const start_digits = p;
uint64_t i = 0;
while (parse_digit(*p, i)) { p++; }
// If there were no digits, or if the integer starts with 0 and has more than one digit, it's an error.
// Optimization note: size_t is expected to be unsigned.
size_t digit_count = size_t(p - start_digits);
if (digit_count == 0 || ('0' == *start_digits && digit_count > 1)) { return INVALID_NUMBER(src); }
//
// Handle floats if there is a . or e (or both)
//
int64_t exponent = 0;
bool is_float = false;
if ('.' == *p) {
is_float = true;
++p;
SIMDJSON_TRY( parse_decimal_after_separator(src, p, i, exponent) );
digit_count = int(p - start_digits); // used later to guard against overflows
}
if (('e' == *p) || ('E' == *p)) {
is_float = true;
++p;
SIMDJSON_TRY( parse_exponent(src, p, exponent) );
}
if (is_float) {
const bool dirty_end = jsoncharutils::is_not_structural_or_whitespace(*p);
SIMDJSON_TRY( write_float(src, negative, i, start_digits, digit_count, exponent, writer) );
if (dirty_end) { return INVALID_NUMBER(src); }
return SUCCESS;
}
// The longest negative 64-bit number is 19 digits.
// The longest positive 64-bit number is 20 digits.
// We do it this way so we don't trigger this branch unless we must.
size_t longest_digit_count = negative ? 19 : 20;
if (digit_count > longest_digit_count) { return BIGINT_NUMBER(src); }
if (digit_count == longest_digit_count) {
if (negative) {
// Anything negative above INT64_MAX+1 is invalid
if (i > uint64_t(INT64_MAX)+1) { return BIGINT_NUMBER(src); }
WRITE_INTEGER(~i+1, src, writer);
if (jsoncharutils::is_not_structural_or_whitespace(*p)) { return INVALID_NUMBER(src); }
return SUCCESS;
// Positive overflow check:
// - A 20 digit number starting with 2-9 is overflow, because 18,446,744,073,709,551,615 is the
// biggest uint64_t.
// - A 20 digit number starting with 1 is overflow if it is less than INT64_MAX.
// If we got here, it's a 20 digit number starting with the digit "1".
// - If a 20 digit number starting with 1 overflowed (i*10+digit), the result will be smaller
// than 1,553,255,926,290,448,384.
// - That is smaller than the smallest possible 20-digit number the user could write:
// 10,000,000,000,000,000,000.
// - Therefore, if the number is positive and lower than that, it's overflow.
// - The value we are looking at is less than or equal to INT64_MAX.
//
} else if (src[0] != uint8_t('1') || i <= uint64_t(INT64_MAX)) { return INVALID_NUMBER(src); }
}
// Write unsigned if it does not fit in a signed integer.
if (i > uint64_t(INT64_MAX)) {
WRITE_UNSIGNED(i, src, writer);
} else {
WRITE_INTEGER(negative ? (~i+1) : i, src, writer);
}
if (jsoncharutils::is_not_structural_or_whitespace(*p)) { return INVALID_NUMBER(src); }
return SUCCESS;
}
// Inlineable functions
namespace {
// This table can be used to characterize the final character of an integer
// string. For JSON structural character and allowable white space characters,
// we return SUCCESS. For 'e', '.' and 'E', we return INCORRECT_TYPE. Otherwise
// we return NUMBER_ERROR.
// Optimization note: we could easily reduce the size of the table by half (to 128)
// at the cost of an extra branch.
// Optimization note: we want the values to use at most 8 bits (not, e.g., 32 bits):
static_assert(error_code(uint8_t(NUMBER_ERROR))== NUMBER_ERROR, "bad NUMBER_ERROR cast");
static_assert(error_code(uint8_t(SUCCESS))== SUCCESS, "bad NUMBER_ERROR cast");
static_assert(error_code(uint8_t(INCORRECT_TYPE))== INCORRECT_TYPE, "bad NUMBER_ERROR cast");
const uint8_t integer_string_finisher[256] = {
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, SUCCESS,
SUCCESS, NUMBER_ERROR, NUMBER_ERROR, SUCCESS, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, SUCCESS, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, SUCCESS,
NUMBER_ERROR, INCORRECT_TYPE, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, SUCCESS, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, INCORRECT_TYPE,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, SUCCESS, NUMBER_ERROR, SUCCESS, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, INCORRECT_TYPE, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, SUCCESS, NUMBER_ERROR,
SUCCESS, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR};
// Parse any number from 0 to 18,446,744,073,709,551,615
simdjson_unused simdjson_inline simdjson_result<uint64_t> parse_unsigned(const uint8_t * const src) noexcept {
const uint8_t *p = src;
//
// Parse the integer part.
//
// PERF NOTE: we don't use is_made_of_eight_digits_fast because large integers like 123456789 are rare
const uint8_t *const start_digits = p;
uint64_t i = 0;
while (parse_digit(*p, i)) { p++; }
// If there were no digits, or if the integer starts with 0 and has more than one digit, it's an error.
// Optimization note: size_t is expected to be unsigned.
size_t digit_count = size_t(p - start_digits);
// The longest positive 64-bit number is 20 digits.
// We do it this way so we don't trigger this branch unless we must.
// Optimization note: the compiler can probably merge
// ((digit_count == 0) || (digit_count > 20))
// into a single branch since digit_count is unsigned.
if ((digit_count == 0) || (digit_count > 20)) { return INCORRECT_TYPE; }
// Here digit_count > 0.
if (('0' == *start_digits) && (digit_count > 1)) { return NUMBER_ERROR; }
// We can do the following...
// if (!jsoncharutils::is_structural_or_whitespace(*p)) {
// return (*p == '.' || *p == 'e' || *p == 'E') ? INCORRECT_TYPE : NUMBER_ERROR;
// }
// as a single table lookup:
if (integer_string_finisher[*p] != SUCCESS) { return error_code(integer_string_finisher[*p]); }
if (digit_count == 20) {
// Positive overflow check:
// - A 20 digit number starting with 2-9 is overflow, because 18,446,744,073,709,551,615 is the
// biggest uint64_t.
// - A 20 digit number starting with 1 is overflow if it is less than INT64_MAX.
// If we got here, it's a 20 digit number starting with the digit "1".
// - If a 20 digit number starting with 1 overflowed (i*10+digit), the result will be smaller
// than 1,553,255,926,290,448,384.
// - That is smaller than the smallest possible 20-digit number the user could write:
// 10,000,000,000,000,000,000.
// - Therefore, if the number is positive and lower than that, it's overflow.
// - The value we are looking at is less than or equal to INT64_MAX.
//
if (src[0] != uint8_t('1') || i <= uint64_t(INT64_MAX)) { return INCORRECT_TYPE; }
}
return i;
}
// Parse any number from 0 to 18,446,744,073,709,551,615
// Never read at src_end or beyond
simdjson_unused simdjson_inline simdjson_result<uint64_t> parse_unsigned(const uint8_t * const src, const uint8_t * const src_end) noexcept {
const uint8_t *p = src;
//
// Parse the integer part.
//
// PERF NOTE: we don't use is_made_of_eight_digits_fast because large integers like 123456789 are rare
const uint8_t *const start_digits = p;
uint64_t i = 0;
while ((p != src_end) && parse_digit(*p, i)) { p++; }
// If there were no digits, or if the integer starts with 0 and has more than one digit, it's an error.
// Optimization note: size_t is expected to be unsigned.
size_t digit_count = size_t(p - start_digits);
// The longest positive 64-bit number is 20 digits.
// We do it this way so we don't trigger this branch unless we must.
// Optimization note: the compiler can probably merge
// ((digit_count == 0) || (digit_count > 20))
// into a single branch since digit_count is unsigned.
if ((digit_count == 0) || (digit_count > 20)) { return INCORRECT_TYPE; }
// Here digit_count > 0.
if (('0' == *start_digits) && (digit_count > 1)) { return NUMBER_ERROR; }
// We can do the following...
// if (!jsoncharutils::is_structural_or_whitespace(*p)) {
// return (*p == '.' || *p == 'e' || *p == 'E') ? INCORRECT_TYPE : NUMBER_ERROR;
// }
// as a single table lookup:
if ((p != src_end) && integer_string_finisher[*p] != SUCCESS) { return error_code(integer_string_finisher[*p]); }
if (digit_count == 20) {
// Positive overflow check:
// - A 20 digit number starting with 2-9 is overflow, because 18,446,744,073,709,551,615 is the
// biggest uint64_t.
// - A 20 digit number starting with 1 is overflow if it is less than INT64_MAX.
// If we got here, it's a 20 digit number starting with the digit "1".
// - If a 20 digit number starting with 1 overflowed (i*10+digit), the result will be smaller
// than 1,553,255,926,290,448,384.
// - That is smaller than the smallest possible 20-digit number the user could write:
// 10,000,000,000,000,000,000.
// - Therefore, if the number is positive and lower than that, it's overflow.
// - The value we are looking at is less than or equal to INT64_MAX.
//
if (src[0] != uint8_t('1') || i <= uint64_t(INT64_MAX)) { return INCORRECT_TYPE; }
}
return i;
}
// Parse any number from 0 to 18,446,744,073,709,551,615
simdjson_unused simdjson_inline simdjson_result<uint64_t> parse_unsigned_in_string(const uint8_t * const src) noexcept {
const uint8_t *p = src + 1;
//
// Parse the integer part.
//
// PERF NOTE: we don't use is_made_of_eight_digits_fast because large integers like 123456789 are rare
const uint8_t *const start_digits = p;
uint64_t i = 0;
while (parse_digit(*p, i)) { p++; }
// If there were no digits, or if the integer starts with 0 and has more than one digit, it's an error.
// Optimization note: size_t is expected to be unsigned.
size_t digit_count = size_t(p - start_digits);
// The longest positive 64-bit number is 20 digits.
// We do it this way so we don't trigger this branch unless we must.
// Optimization note: the compiler can probably merge
// ((digit_count == 0) || (digit_count > 20))
// into a single branch since digit_count is unsigned.
if ((digit_count == 0) || (digit_count > 20)) { return INCORRECT_TYPE; }
// Here digit_count > 0.
if (('0' == *start_digits) && (digit_count > 1)) { return NUMBER_ERROR; }
// We can do the following...
// if (!jsoncharutils::is_structural_or_whitespace(*p)) {
// return (*p == '.' || *p == 'e' || *p == 'E') ? INCORRECT_TYPE : NUMBER_ERROR;
// }
// as a single table lookup:
if (*p != '"') { return NUMBER_ERROR; }
if (digit_count == 20) {
// Positive overflow check:
// - A 20 digit number starting with 2-9 is overflow, because 18,446,744,073,709,551,615 is the
// biggest uint64_t.
// - A 20 digit number starting with 1 is overflow if it is less than INT64_MAX.
// If we got here, it's a 20 digit number starting with the digit "1".
// - If a 20 digit number starting with 1 overflowed (i*10+digit), the result will be smaller
// than 1,553,255,926,290,448,384.
// - That is smaller than the smallest possible 20-digit number the user could write:
// 10,000,000,000,000,000,000.
// - Therefore, if the number is positive and lower than that, it's overflow.
// - The value we are looking at is less than or equal to INT64_MAX.
//
// Note: we use src[1] and not src[0] because src[0] is the quote character in this
// instance.
if (src[1] != uint8_t('1') || i <= uint64_t(INT64_MAX)) { return INCORRECT_TYPE; }
}
return i;
}
// Parse any number from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
simdjson_unused simdjson_inline simdjson_result<int64_t> parse_integer(const uint8_t *src) noexcept {
//
// Check for minus sign
//
bool negative = (*src == '-');
const uint8_t *p = src + uint8_t(negative);
//
// Parse the integer part.
//
// PERF NOTE: we don't use is_made_of_eight_digits_fast because large integers like 123456789 are rare
const uint8_t *const start_digits = p;
uint64_t i = 0;
while (parse_digit(*p, i)) { p++; }
// If there were no digits, or if the integer starts with 0 and has more than one digit, it's an error.
// Optimization note: size_t is expected to be unsigned.
size_t digit_count = size_t(p - start_digits);
// We go from
// -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
// so we can never represent numbers that have more than 19 digits.
size_t longest_digit_count = 19;
// Optimization note: the compiler can probably merge
// ((digit_count == 0) || (digit_count > longest_digit_count))
// into a single branch since digit_count is unsigned.
if ((digit_count == 0) || (digit_count > longest_digit_count)) { return INCORRECT_TYPE; }
// Here digit_count > 0.
if (('0' == *start_digits) && (digit_count > 1)) { return NUMBER_ERROR; }
// We can do the following...
// if (!jsoncharutils::is_structural_or_whitespace(*p)) {
// return (*p == '.' || *p == 'e' || *p == 'E') ? INCORRECT_TYPE : NUMBER_ERROR;
// }
// as a single table lookup:
if(integer_string_finisher[*p] != SUCCESS) { return error_code(integer_string_finisher[*p]); }
// Negative numbers have can go down to - INT64_MAX - 1 whereas positive numbers are limited to INT64_MAX.
// Performance note: This check is only needed when digit_count == longest_digit_count but it is
// so cheap that we might as well always make it.
if(i > uint64_t(INT64_MAX) + uint64_t(negative)) { return INCORRECT_TYPE; }
return negative ? (~i+1) : i;
}
// Parse any number from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
// Never read at src_end or beyond
simdjson_unused simdjson_inline simdjson_result<int64_t> parse_integer(const uint8_t * const src, const uint8_t * const src_end) noexcept {
//
// Check for minus sign
//
if(src == src_end) { return NUMBER_ERROR; }
bool negative = (*src == '-');
const uint8_t *p = src + uint8_t(negative);
//
// Parse the integer part.
//
// PERF NOTE: we don't use is_made_of_eight_digits_fast because large integers like 123456789 are rare
const uint8_t *const start_digits = p;
uint64_t i = 0;
while ((p != src_end) && parse_digit(*p, i)) { p++; }
// If there were no digits, or if the integer starts with 0 and has more than one digit, it's an error.
// Optimization note: size_t is expected to be unsigned.
size_t digit_count = size_t(p - start_digits);
// We go from
// -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
// so we can never represent numbers that have more than 19 digits.
size_t longest_digit_count = 19;
// Optimization note: the compiler can probably merge
// ((digit_count == 0) || (digit_count > longest_digit_count))
// into a single branch since digit_count is unsigned.
if ((digit_count == 0) || (digit_count > longest_digit_count)) { return INCORRECT_TYPE; }
// Here digit_count > 0.
if (('0' == *start_digits) && (digit_count > 1)) { return NUMBER_ERROR; }
// We can do the following...
// if (!jsoncharutils::is_structural_or_whitespace(*p)) {
// return (*p == '.' || *p == 'e' || *p == 'E') ? INCORRECT_TYPE : NUMBER_ERROR;
// }
// as a single table lookup:
if((p != src_end) && integer_string_finisher[*p] != SUCCESS) { return error_code(integer_string_finisher[*p]); }
// Negative numbers have can go down to - INT64_MAX - 1 whereas positive numbers are limited to INT64_MAX.
// Performance note: This check is only needed when digit_count == longest_digit_count but it is
// so cheap that we might as well always make it.
if(i > uint64_t(INT64_MAX) + uint64_t(negative)) { return INCORRECT_TYPE; }
return negative ? (~i+1) : i;
}
// Parse any number from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
simdjson_unused simdjson_inline simdjson_result<int64_t> parse_integer_in_string(const uint8_t *src) noexcept {
//
// Check for minus sign
//
bool negative = (*(src + 1) == '-');
src += uint8_t(negative) + 1;
//
// Parse the integer part.
//
// PERF NOTE: we don't use is_made_of_eight_digits_fast because large integers like 123456789 are rare
const uint8_t *const start_digits = src;
uint64_t i = 0;
while (parse_digit(*src, i)) { src++; }
// If there were no digits, or if the integer starts with 0 and has more than one digit, it's an error.
// Optimization note: size_t is expected to be unsigned.
size_t digit_count = size_t(src - start_digits);
// We go from
// -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
// so we can never represent numbers that have more than 19 digits.
size_t longest_digit_count = 19;
// Optimization note: the compiler can probably merge
// ((digit_count == 0) || (digit_count > longest_digit_count))
// into a single branch since digit_count is unsigned.
if ((digit_count == 0) || (digit_count > longest_digit_count)) { return INCORRECT_TYPE; }
// Here digit_count > 0.
if (('0' == *start_digits) && (digit_count > 1)) { return NUMBER_ERROR; }
// We can do the following...
// if (!jsoncharutils::is_structural_or_whitespace(*src)) {
// return (*src == '.' || *src == 'e' || *src == 'E') ? INCORRECT_TYPE : NUMBER_ERROR;
// }
// as a single table lookup:
if(*src != '"') { return NUMBER_ERROR; }
// Negative numbers have can go down to - INT64_MAX - 1 whereas positive numbers are limited to INT64_MAX.
// Performance note: This check is only needed when digit_count == longest_digit_count but it is
// so cheap that we might as well always make it.
if(i > uint64_t(INT64_MAX) + uint64_t(negative)) { return INCORRECT_TYPE; }
return negative ? (~i+1) : i;
}
simdjson_unused simdjson_inline simdjson_result<double> parse_double(const uint8_t * src) noexcept {
//
// Check for minus sign
//
bool negative = (*src == '-');
src += uint8_t(negative);
//
// Parse the integer part.
//
uint64_t i = 0;
const uint8_t *p = src;
p += parse_digit(*p, i);
bool leading_zero = (i == 0);
while (parse_digit(*p, i)) { p++; }
// no integer digits, or 0123 (zero must be solo)
if ( p == src ) { return INCORRECT_TYPE; }
if ( (leading_zero && p != src+1)) { return NUMBER_ERROR; }
//
// Parse the decimal part.
//
int64_t exponent = 0;
bool overflow;
if (simdjson_likely(*p == '.')) {
p++;
const uint8_t *start_decimal_digits = p;
if (!parse_digit(*p, i)) { return NUMBER_ERROR; } // no decimal digits
p++;
while (parse_digit(*p, i)) { p++; }
exponent = -(p - start_decimal_digits);
// Overflow check. More than 19 digits (minus the decimal) may be overflow.
overflow = p-src-1 > 19;
if (simdjson_unlikely(overflow && leading_zero)) {
// Skip leading 0.00000 and see if it still overflows
const uint8_t *start_digits = src + 2;
while (*start_digits == '0') { start_digits++; }
overflow = p-start_digits > 19;
}
} else {
overflow = p-src > 19;
}
//
// Parse the exponent
//
if (*p == 'e' || *p == 'E') {
p++;
bool exp_neg = *p == '-';
p += exp_neg || *p == '+';
uint64_t exp = 0;
const uint8_t *start_exp_digits = p;
while (parse_digit(*p, exp)) { p++; }
// no exp digits, or 20+ exp digits
if (p-start_exp_digits == 0 || p-start_exp_digits > 19) { return NUMBER_ERROR; }
exponent += exp_neg ? 0-exp : exp;
}
if (jsoncharutils::is_not_structural_or_whitespace(*p)) { return NUMBER_ERROR; }
overflow = overflow || exponent < simdjson::internal::smallest_power || exponent > simdjson::internal::largest_power;
//
// Assemble (or slow-parse) the float
//
double d;
if (simdjson_likely(!overflow)) {
if (compute_float_64(exponent, i, negative, d)) { return d; }
}
if (!parse_float_fallback(src - uint8_t(negative), &d)) {
return NUMBER_ERROR;
}
return d;
}
simdjson_unused simdjson_inline bool is_negative(const uint8_t * src) noexcept {
return (*src == '-');
}
simdjson_unused simdjson_inline simdjson_result<bool> is_integer(const uint8_t * src) noexcept {
bool negative = (*src == '-');
src += uint8_t(negative);
const uint8_t *p = src;
while(static_cast<uint8_t>(*p - '0') <= 9) { p++; }
if ( p == src ) { return NUMBER_ERROR; }
if (jsoncharutils::is_structural_or_whitespace(*p)) { return true; }
return false;
}
simdjson_unused simdjson_inline simdjson_result<number_type> get_number_type(const uint8_t * src) noexcept {
bool negative = (*src == '-');
src += uint8_t(negative);
const uint8_t *p = src;
while(static_cast<uint8_t>(*p - '0') <= 9) { p++; }
size_t digit_count = size_t(p - src);
if ( p == src ) { return NUMBER_ERROR; }
if (jsoncharutils::is_structural_or_whitespace(*p)) {
static const uint8_t * smaller_big_integer = reinterpret_cast<const uint8_t *>("9223372036854775808");
// We have an integer.
if(simdjson_unlikely(digit_count > 20)) {
return number_type::big_integer;
}
// If the number is negative and valid, it must be a signed integer.
if(negative) {
if (simdjson_unlikely(digit_count > 19)) return number_type::big_integer;
if (simdjson_unlikely(digit_count == 19 && memcmp(src, smaller_big_integer, 19) > 0)) {
return number_type::big_integer;
}
return number_type::signed_integer;
}
// Let us check if we have a big integer (>=2**64).
static const uint8_t * two_to_sixtyfour = reinterpret_cast<const uint8_t *>("18446744073709551616");
if((digit_count > 20) || (digit_count == 20 && memcmp(src, two_to_sixtyfour, 20) >= 0)) {
return number_type::big_integer;
}
// The number is positive and smaller than 18446744073709551616 (or 2**64).
// We want values larger or equal to 9223372036854775808 to be unsigned
// integers, and the other values to be signed integers.
if((digit_count == 20) || (digit_count >= 19 && memcmp(src, smaller_big_integer, 19) >= 0)) {
return number_type::unsigned_integer;
}
return number_type::signed_integer;
}
// Hopefully, we have 'e' or 'E' or '.'.
return number_type::floating_point_number;
}
// Never read at src_end or beyond
simdjson_unused simdjson_inline simdjson_result<double> parse_double(const uint8_t * src, const uint8_t * const src_end) noexcept {
if(src == src_end) { return NUMBER_ERROR; }
//
// Check for minus sign
//
bool negative = (*src == '-');
src += uint8_t(negative);
//
// Parse the integer part.
//
uint64_t i = 0;
const uint8_t *p = src;
if(p == src_end) { return NUMBER_ERROR; }
p += parse_digit(*p, i);
bool leading_zero = (i == 0);
while ((p != src_end) && parse_digit(*p, i)) { p++; }
// no integer digits, or 0123 (zero must be solo)
if ( p == src ) { return INCORRECT_TYPE; }
if ( (leading_zero && p != src+1)) { return NUMBER_ERROR; }
//
// Parse the decimal part.
//
int64_t exponent = 0;
bool overflow;
if (simdjson_likely((p != src_end) && (*p == '.'))) {
p++;
const uint8_t *start_decimal_digits = p;
if ((p == src_end) || !parse_digit(*p, i)) { return NUMBER_ERROR; } // no decimal digits
p++;
while ((p != src_end) && parse_digit(*p, i)) { p++; }
exponent = -(p - start_decimal_digits);
// Overflow check. More than 19 digits (minus the decimal) may be overflow.
overflow = p-src-1 > 19;
if (simdjson_unlikely(overflow && leading_zero)) {
// Skip leading 0.00000 and see if it still overflows
const uint8_t *start_digits = src + 2;
while (*start_digits == '0') { start_digits++; }
overflow = start_digits-src > 19;
}
} else {
overflow = p-src > 19;
}
//
// Parse the exponent
//
if ((p != src_end) && (*p == 'e' || *p == 'E')) {
p++;
if(p == src_end) { return NUMBER_ERROR; }
bool exp_neg = *p == '-';
p += exp_neg || *p == '+';
uint64_t exp = 0;
const uint8_t *start_exp_digits = p;
while ((p != src_end) && parse_digit(*p, exp)) { p++; }
// no exp digits, or 20+ exp digits
if (p-start_exp_digits == 0 || p-start_exp_digits > 19) { return NUMBER_ERROR; }
exponent += exp_neg ? 0-exp : exp;
}
if ((p != src_end) && jsoncharutils::is_not_structural_or_whitespace(*p)) { return NUMBER_ERROR; }
overflow = overflow || exponent < simdjson::internal::smallest_power || exponent > simdjson::internal::largest_power;
//
// Assemble (or slow-parse) the float
//
double d;
if (simdjson_likely(!overflow)) {
if (compute_float_64(exponent, i, negative, d)) { return d; }
}
if (!parse_float_fallback(src - uint8_t(negative), src_end, &d)) {
return NUMBER_ERROR;
}
return d;
}
simdjson_unused simdjson_inline simdjson_result<double> parse_double_in_string(const uint8_t * src) noexcept {
//
// Check for minus sign
//
bool negative = (*(src + 1) == '-');
src += uint8_t(negative) + 1;
//
// Parse the integer part.
//
uint64_t i = 0;
const uint8_t *p = src;
p += parse_digit(*p, i);
bool leading_zero = (i == 0);
while (parse_digit(*p, i)) { p++; }
// no integer digits, or 0123 (zero must be solo)
if ( p == src ) { return INCORRECT_TYPE; }
if ( (leading_zero && p != src+1)) { return NUMBER_ERROR; }
//
// Parse the decimal part.
//
int64_t exponent = 0;
bool overflow;
if (simdjson_likely(*p == '.')) {
p++;
const uint8_t *start_decimal_digits = p;
if (!parse_digit(*p, i)) { return NUMBER_ERROR; } // no decimal digits
p++;
while (parse_digit(*p, i)) { p++; }
exponent = -(p - start_decimal_digits);
// Overflow check. More than 19 digits (minus the decimal) may be overflow.
overflow = p-src-1 > 19;
if (simdjson_unlikely(overflow && leading_zero)) {
// Skip leading 0.00000 and see if it still overflows
const uint8_t *start_digits = src + 2;
while (*start_digits == '0') { start_digits++; }
overflow = p-start_digits > 19;
}
} else {
overflow = p-src > 19;
}
//
// Parse the exponent
//
if (*p == 'e' || *p == 'E') {
p++;
bool exp_neg = *p == '-';
p += exp_neg || *p == '+';
uint64_t exp = 0;
const uint8_t *start_exp_digits = p;
while (parse_digit(*p, exp)) { p++; }
// no exp digits, or 20+ exp digits
if (p-start_exp_digits == 0 || p-start_exp_digits > 19) { return NUMBER_ERROR; }
exponent += exp_neg ? 0-exp : exp;
}
if (*p != '"') { return NUMBER_ERROR; }
overflow = overflow || exponent < simdjson::internal::smallest_power || exponent > simdjson::internal::largest_power;
//
// Assemble (or slow-parse) the float
//
double d;
if (simdjson_likely(!overflow)) {
if (compute_float_64(exponent, i, negative, d)) { return d; }
}
if (!parse_float_fallback(src - uint8_t(negative), &d)) {
return NUMBER_ERROR;
}
return d;
}
} // unnamed namespace
#endif // SIMDJSON_SKIPNUMBERPARSING
} // namespace numberparsing
inline std::ostream& operator<<(std::ostream& out, number_type type) noexcept {
switch (type) {
case number_type::signed_integer: out << "integer in [-9223372036854775808,9223372036854775808)"; break;
case number_type::unsigned_integer: out << "unsigned integer in [9223372036854775808,18446744073709551616)"; break;
case number_type::floating_point_number: out << "floating-point number (binary64)"; break;
case number_type::big_integer: out << "big integer"; break;
default: SIMDJSON_UNREACHABLE();
}
return out;
}
} // namespace westmere
} // namespace simdjson
#endif // SIMDJSON_GENERIC_NUMBERPARSING_H
/* end file simdjson/generic/numberparsing.h for westmere */
/* including simdjson/generic/implementation_simdjson_result_base-inl.h for westmere: #include "simdjson/generic/implementation_simdjson_result_base-inl.h" */
/* begin file simdjson/generic/implementation_simdjson_result_base-inl.h for westmere */
#ifndef SIMDJSON_GENERIC_IMPLEMENTATION_SIMDJSON_RESULT_BASE_INL_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_GENERIC_IMPLEMENTATION_SIMDJSON_RESULT_BASE_INL_H */
/* amalgamation skipped (editor-only): #include "simdjson/generic/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/generic/implementation_simdjson_result_base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace westmere {
//
// internal::implementation_simdjson_result_base<T> inline implementation
//
template<typename T>
simdjson_inline void implementation_simdjson_result_base<T>::tie(T &value, error_code &error) && noexcept {
error = this->second;
if (!error) {
value = std::forward<implementation_simdjson_result_base<T>>(*this).first;
}
}
template<typename T>
simdjson_warn_unused simdjson_inline error_code implementation_simdjson_result_base<T>::get(T &value) && noexcept {
error_code error;
std::forward<implementation_simdjson_result_base<T>>(*this).tie(value, error);
return error;
}
template<typename T>
simdjson_inline error_code implementation_simdjson_result_base<T>::error() const noexcept {
return this->second;
}
#if SIMDJSON_EXCEPTIONS
template<typename T>
simdjson_inline T& implementation_simdjson_result_base<T>::value() & noexcept(false) {
if (error()) { throw simdjson_error(error()); }
return this->first;
}
template<typename T>
simdjson_inline T&& implementation_simdjson_result_base<T>::value() && noexcept(false) {
return std::forward<implementation_simdjson_result_base<T>>(*this).take_value();
}
template<typename T>
simdjson_inline T&& implementation_simdjson_result_base<T>::take_value() && noexcept(false) {
if (error()) { throw simdjson_error(error()); }
return std::forward<T>(this->first);
}
template<typename T>
simdjson_inline implementation_simdjson_result_base<T>::operator T&&() && noexcept(false) {
return std::forward<implementation_simdjson_result_base<T>>(*this).take_value();
}
#endif // SIMDJSON_EXCEPTIONS
template<typename T>
simdjson_inline const T& implementation_simdjson_result_base<T>::value_unsafe() const& noexcept {
return this->first;
}
template<typename T>
simdjson_inline T& implementation_simdjson_result_base<T>::value_unsafe() & noexcept {
return this->first;
}
template<typename T>
simdjson_inline T&& implementation_simdjson_result_base<T>::value_unsafe() && noexcept {
return std::forward<T>(this->first);
}
template<typename T>
simdjson_inline implementation_simdjson_result_base<T>::implementation_simdjson_result_base(T &&value, error_code error) noexcept
: first{std::forward<T>(value)}, second{error} {}
template<typename T>
simdjson_inline implementation_simdjson_result_base<T>::implementation_simdjson_result_base(error_code error) noexcept
: implementation_simdjson_result_base(T{}, error) {}
template<typename T>
simdjson_inline implementation_simdjson_result_base<T>::implementation_simdjson_result_base(T &&value) noexcept
: implementation_simdjson_result_base(std::forward<T>(value), SUCCESS) {}
} // namespace westmere
} // namespace simdjson
#endif // SIMDJSON_GENERIC_IMPLEMENTATION_SIMDJSON_RESULT_BASE_INL_H
/* end file simdjson/generic/implementation_simdjson_result_base-inl.h for westmere */
/* end file simdjson/generic/amalgamated.h for westmere */
/* including simdjson/westmere/end.h: #include "simdjson/westmere/end.h" */
/* begin file simdjson/westmere/end.h */
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/westmere/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#if !SIMDJSON_CAN_ALWAYS_RUN_WESTMERE
SIMDJSON_UNTARGET_REGION
#endif
/* undefining SIMDJSON_IMPLEMENTATION from "westmere" */
#undef SIMDJSON_IMPLEMENTATION
/* end file simdjson/westmere/end.h */
#endif // SIMDJSON_WESTMERE_H
/* end file simdjson/westmere.h */
/* including simdjson/westmere/implementation.h: #include <simdjson/westmere/implementation.h> */
/* begin file simdjson/westmere/implementation.h */
#ifndef SIMDJSON_WESTMERE_IMPLEMENTATION_H
#define SIMDJSON_WESTMERE_IMPLEMENTATION_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/westmere/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/implementation.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/instruction_set.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
// The constructor may be executed on any host, so we take care not to use SIMDJSON_TARGET_WESTMERE
namespace simdjson {
namespace westmere {
/**
* @private
*/
class implementation final : public simdjson::implementation {
public:
simdjson_inline implementation() : simdjson::implementation("westmere", "Intel/AMD SSE4.2", internal::instruction_set::SSE42 | internal::instruction_set::PCLMULQDQ) {}
simdjson_warn_unused error_code create_dom_parser_implementation(
size_t capacity,
size_t max_length,
std::unique_ptr<internal::dom_parser_implementation>& dst
) const noexcept final;
simdjson_warn_unused error_code minify(const uint8_t *buf, size_t len, uint8_t *dst, size_t &dst_len) const noexcept final;
simdjson_warn_unused bool validate_utf8(const char *buf, size_t len) const noexcept final;
};
} // namespace westmere
} // namespace simdjson
#endif // SIMDJSON_WESTMERE_IMPLEMENTATION_H
/* end file simdjson/westmere/implementation.h */
/* including simdjson/westmere/begin.h: #include <simdjson/westmere/begin.h> */
/* begin file simdjson/westmere/begin.h */
/* defining SIMDJSON_IMPLEMENTATION to "westmere" */
#define SIMDJSON_IMPLEMENTATION westmere
/* including simdjson/westmere/base.h: #include "simdjson/westmere/base.h" */
/* begin file simdjson/westmere/base.h */
#ifndef SIMDJSON_WESTMERE_BASE_H
#define SIMDJSON_WESTMERE_BASE_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
// The constructor may be executed on any host, so we take care not to use SIMDJSON_TARGET_WESTMERE
namespace simdjson {
/**
* Implementation for Westmere (Intel SSE4.2).
*/
namespace westmere {
class implementation;
namespace {
namespace simd {
template <typename T> struct simd8;
template <typename T> struct simd8x64;
} // namespace simd
} // unnamed namespace
} // namespace westmere
} // namespace simdjson
#endif // SIMDJSON_WESTMERE_BASE_H
/* end file simdjson/westmere/base.h */
/* including simdjson/westmere/intrinsics.h: #include "simdjson/westmere/intrinsics.h" */
/* begin file simdjson/westmere/intrinsics.h */
#ifndef SIMDJSON_WESTMERE_INTRINSICS_H
#define SIMDJSON_WESTMERE_INTRINSICS_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/westmere/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#if SIMDJSON_VISUAL_STUDIO
// under clang within visual studio, this will include <x86intrin.h>
#include <intrin.h> // visual studio or clang
#else
#include <x86intrin.h> // elsewhere
#endif // SIMDJSON_VISUAL_STUDIO
#if SIMDJSON_CLANG_VISUAL_STUDIO
/**
* You are not supposed, normally, to include these
* headers directly. Instead you should either include intrin.h
* or x86intrin.h. However, when compiling with clang
* under Windows (i.e., when _MSC_VER is set), these headers
* only get included *if* the corresponding features are detected
* from macros:
*/
#include <smmintrin.h> // for _mm_alignr_epi8
#include <wmmintrin.h> // for _mm_clmulepi64_si128
#endif
static_assert(sizeof(__m128i) <= simdjson::SIMDJSON_PADDING, "insufficient padding for westmere");
#endif // SIMDJSON_WESTMERE_INTRINSICS_H
/* end file simdjson/westmere/intrinsics.h */
#if !SIMDJSON_CAN_ALWAYS_RUN_WESTMERE
SIMDJSON_TARGET_REGION("sse4.2,pclmul,popcnt")
#endif
/* including simdjson/westmere/bitmanipulation.h: #include "simdjson/westmere/bitmanipulation.h" */
/* begin file simdjson/westmere/bitmanipulation.h */
#ifndef SIMDJSON_WESTMERE_BITMANIPULATION_H
#define SIMDJSON_WESTMERE_BITMANIPULATION_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/westmere/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/westmere/intrinsics.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace westmere {
namespace {
// We sometimes call trailing_zero on inputs that are zero,
// but the algorithms do not end up using the returned value.
// Sadly, sanitizers are not smart enough to figure it out.
SIMDJSON_NO_SANITIZE_UNDEFINED
// This function can be used safely even if not all bytes have been
// initialized.
// See issue https://github.com/simdjson/simdjson/issues/1965
SIMDJSON_NO_SANITIZE_MEMORY
simdjson_inline int trailing_zeroes(uint64_t input_num) {
#if SIMDJSON_REGULAR_VISUAL_STUDIO
unsigned long ret;
// Search the mask data from least significant bit (LSB)
// to the most significant bit (MSB) for a set bit (1).
_BitScanForward64(&ret, input_num);
return (int)ret;
#else // SIMDJSON_REGULAR_VISUAL_STUDIO
return __builtin_ctzll(input_num);
#endif // SIMDJSON_REGULAR_VISUAL_STUDIO
}
/* result might be undefined when input_num is zero */
simdjson_inline uint64_t clear_lowest_bit(uint64_t input_num) {
return input_num & (input_num-1);
}
/* result might be undefined when input_num is zero */
simdjson_inline int leading_zeroes(uint64_t input_num) {
#if SIMDJSON_REGULAR_VISUAL_STUDIO
unsigned long leading_zero = 0;
// Search the mask data from most significant bit (MSB)
// to least significant bit (LSB) for a set bit (1).
if (_BitScanReverse64(&leading_zero, input_num))
return (int)(63 - leading_zero);
else
return 64;
#else
return __builtin_clzll(input_num);
#endif// SIMDJSON_REGULAR_VISUAL_STUDIO
}
#if SIMDJSON_REGULAR_VISUAL_STUDIO
simdjson_inline unsigned __int64 count_ones(uint64_t input_num) {
// note: we do not support legacy 32-bit Windows in this kernel
return __popcnt64(input_num);// Visual Studio wants two underscores
}
#else
simdjson_inline long long int count_ones(uint64_t input_num) {
return _popcnt64(input_num);
}
#endif
simdjson_inline bool add_overflow(uint64_t value1, uint64_t value2,
uint64_t *result) {
#if SIMDJSON_REGULAR_VISUAL_STUDIO
return _addcarry_u64(0, value1, value2,
reinterpret_cast<unsigned __int64 *>(result));
#else
return __builtin_uaddll_overflow(value1, value2,
reinterpret_cast<unsigned long long *>(result));
#endif
}
} // unnamed namespace
} // namespace westmere
} // namespace simdjson
#endif // SIMDJSON_WESTMERE_BITMANIPULATION_H
/* end file simdjson/westmere/bitmanipulation.h */
/* including simdjson/westmere/bitmask.h: #include "simdjson/westmere/bitmask.h" */
/* begin file simdjson/westmere/bitmask.h */
#ifndef SIMDJSON_WESTMERE_BITMASK_H
#define SIMDJSON_WESTMERE_BITMASK_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/westmere/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/westmere/intrinsics.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace westmere {
namespace {
//
// Perform a "cumulative bitwise xor," flipping bits each time a 1 is encountered.
//
// For example, prefix_xor(00100100) == 00011100
//
simdjson_inline uint64_t prefix_xor(const uint64_t bitmask) {
// There should be no such thing with a processing supporting avx2
// but not clmul.
__m128i all_ones = _mm_set1_epi8('\xFF');
__m128i result = _mm_clmulepi64_si128(_mm_set_epi64x(0ULL, bitmask), all_ones, 0);
return _mm_cvtsi128_si64(result);
}
} // unnamed namespace
} // namespace westmere
} // namespace simdjson
#endif // SIMDJSON_WESTMERE_BITMASK_H
/* end file simdjson/westmere/bitmask.h */
/* including simdjson/westmere/numberparsing_defs.h: #include "simdjson/westmere/numberparsing_defs.h" */
/* begin file simdjson/westmere/numberparsing_defs.h */
#ifndef SIMDJSON_WESTMERE_NUMBERPARSING_DEFS_H
#define SIMDJSON_WESTMERE_NUMBERPARSING_DEFS_H
/* including simdjson/westmere/base.h: #include "simdjson/westmere/base.h" */
/* begin file simdjson/westmere/base.h */
#ifndef SIMDJSON_WESTMERE_BASE_H
#define SIMDJSON_WESTMERE_BASE_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
// The constructor may be executed on any host, so we take care not to use SIMDJSON_TARGET_WESTMERE
namespace simdjson {
/**
* Implementation for Westmere (Intel SSE4.2).
*/
namespace westmere {
class implementation;
namespace {
namespace simd {
template <typename T> struct simd8;
template <typename T> struct simd8x64;
} // namespace simd
} // unnamed namespace
} // namespace westmere
} // namespace simdjson
#endif // SIMDJSON_WESTMERE_BASE_H
/* end file simdjson/westmere/base.h */
/* including simdjson/westmere/intrinsics.h: #include "simdjson/westmere/intrinsics.h" */
/* begin file simdjson/westmere/intrinsics.h */
#ifndef SIMDJSON_WESTMERE_INTRINSICS_H
#define SIMDJSON_WESTMERE_INTRINSICS_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/westmere/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#if SIMDJSON_VISUAL_STUDIO
// under clang within visual studio, this will include <x86intrin.h>
#include <intrin.h> // visual studio or clang
#else
#include <x86intrin.h> // elsewhere
#endif // SIMDJSON_VISUAL_STUDIO
#if SIMDJSON_CLANG_VISUAL_STUDIO
/**
* You are not supposed, normally, to include these
* headers directly. Instead you should either include intrin.h
* or x86intrin.h. However, when compiling with clang
* under Windows (i.e., when _MSC_VER is set), these headers
* only get included *if* the corresponding features are detected
* from macros:
*/
#include <smmintrin.h> // for _mm_alignr_epi8
#include <wmmintrin.h> // for _mm_clmulepi64_si128
#endif
static_assert(sizeof(__m128i) <= simdjson::SIMDJSON_PADDING, "insufficient padding for westmere");
#endif // SIMDJSON_WESTMERE_INTRINSICS_H
/* end file simdjson/westmere/intrinsics.h */
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/internal/numberparsing_tables.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace westmere {
namespace numberparsing {
/** @private */
static simdjson_inline uint32_t parse_eight_digits_unrolled(const uint8_t *chars) {
// this actually computes *16* values so we are being wasteful.
const __m128i ascii0 = _mm_set1_epi8('0');
const __m128i mul_1_10 =
_mm_setr_epi8(10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1, 10, 1);
const __m128i mul_1_100 = _mm_setr_epi16(100, 1, 100, 1, 100, 1, 100, 1);
const __m128i mul_1_10000 =
_mm_setr_epi16(10000, 1, 10000, 1, 10000, 1, 10000, 1);
const __m128i input = _mm_sub_epi8(
_mm_loadu_si128(reinterpret_cast<const __m128i *>(chars)), ascii0);
const __m128i t1 = _mm_maddubs_epi16(input, mul_1_10);
const __m128i t2 = _mm_madd_epi16(t1, mul_1_100);
const __m128i t3 = _mm_packus_epi32(t2, t2);
const __m128i t4 = _mm_madd_epi16(t3, mul_1_10000);
return _mm_cvtsi128_si32(
t4); // only captures the sum of the first 8 digits, drop the rest
}
/** @private */
simdjson_inline internal::value128 full_multiplication(uint64_t value1, uint64_t value2) {
internal::value128 answer;
#if SIMDJSON_REGULAR_VISUAL_STUDIO || SIMDJSON_IS_32BITS
#ifdef _M_ARM64
// ARM64 has native support for 64-bit multiplications, no need to emultate
answer.high = __umulh(value1, value2);
answer.low = value1 * value2;
#else
answer.low = _umul128(value1, value2, &answer.high); // _umul128 not available on ARM64
#endif // _M_ARM64
#else // SIMDJSON_REGULAR_VISUAL_STUDIO || SIMDJSON_IS_32BITS
__uint128_t r = (static_cast<__uint128_t>(value1)) * value2;
answer.low = uint64_t(r);
answer.high = uint64_t(r >> 64);
#endif
return answer;
}
} // namespace numberparsing
} // namespace westmere
} // namespace simdjson
#define SIMDJSON_SWAR_NUMBER_PARSING 1
#endif // SIMDJSON_WESTMERE_NUMBERPARSING_DEFS_H
/* end file simdjson/westmere/numberparsing_defs.h */
/* including simdjson/westmere/simd.h: #include "simdjson/westmere/simd.h" */
/* begin file simdjson/westmere/simd.h */
#ifndef SIMDJSON_WESTMERE_SIMD_H
#define SIMDJSON_WESTMERE_SIMD_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/westmere/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/westmere/bitmanipulation.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/simdprune_tables.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace westmere {
namespace {
namespace simd {
template<typename Child>
struct base {
__m128i value;
// Zero constructor
simdjson_inline base() : value{__m128i()} {}
// Conversion from SIMD register
simdjson_inline base(const __m128i _value) : value(_value) {}
// Conversion to SIMD register
simdjson_inline operator const __m128i&() const { return this->value; }
simdjson_inline operator __m128i&() { return this->value; }
// Bit operations
simdjson_inline Child operator|(const Child other) const { return _mm_or_si128(*this, other); }
simdjson_inline Child operator&(const Child other) const { return _mm_and_si128(*this, other); }
simdjson_inline Child operator^(const Child other) const { return _mm_xor_si128(*this, other); }
simdjson_inline Child bit_andnot(const Child other) const { return _mm_andnot_si128(other, *this); }
simdjson_inline Child& operator|=(const Child other) { auto this_cast = static_cast<Child*>(this); *this_cast = *this_cast | other; return *this_cast; }
simdjson_inline Child& operator&=(const Child other) { auto this_cast = static_cast<Child*>(this); *this_cast = *this_cast & other; return *this_cast; }
simdjson_inline Child& operator^=(const Child other) { auto this_cast = static_cast<Child*>(this); *this_cast = *this_cast ^ other; return *this_cast; }
};
template<typename T, typename Mask=simd8<bool>>
struct base8: base<simd8<T>> {
typedef uint16_t bitmask_t;
typedef uint32_t bitmask2_t;
simdjson_inline base8() : base<simd8<T>>() {}
simdjson_inline base8(const __m128i _value) : base<simd8<T>>(_value) {}
friend simdjson_inline Mask operator==(const simd8<T> lhs, const simd8<T> rhs) { return _mm_cmpeq_epi8(lhs, rhs); }
static const int SIZE = sizeof(base<simd8<T>>::value);
template<int N=1>
simdjson_inline simd8<T> prev(const simd8<T> prev_chunk) const {
return _mm_alignr_epi8(*this, prev_chunk, 16 - N);
}
};
// SIMD byte mask type (returned by things like eq and gt)
template<>
struct simd8<bool>: base8<bool> {
static simdjson_inline simd8<bool> splat(bool _value) { return _mm_set1_epi8(uint8_t(-(!!_value))); }
simdjson_inline simd8<bool>() : base8() {}
simdjson_inline simd8<bool>(const __m128i _value) : base8<bool>(_value) {}
// Splat constructor
simdjson_inline simd8<bool>(bool _value) : base8<bool>(splat(_value)) {}
simdjson_inline int to_bitmask() const { return _mm_movemask_epi8(*this); }
simdjson_inline bool any() const { return !_mm_testz_si128(*this, *this); }
simdjson_inline simd8<bool> operator~() const { return *this ^ true; }
};
template<typename T>
struct base8_numeric: base8<T> {
static simdjson_inline simd8<T> splat(T _value) { return _mm_set1_epi8(_value); }
static simdjson_inline simd8<T> zero() { return _mm_setzero_si128(); }
static simdjson_inline simd8<T> load(const T values[16]) {
return _mm_loadu_si128(reinterpret_cast<const __m128i *>(values));
}
// Repeat 16 values as many times as necessary (usually for lookup tables)
static simdjson_inline simd8<T> repeat_16(
T v0, T v1, T v2, T v3, T v4, T v5, T v6, T v7,
T v8, T v9, T v10, T v11, T v12, T v13, T v14, T v15
) {
return simd8<T>(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
);
}
simdjson_inline base8_numeric() : base8<T>() {}
simdjson_inline base8_numeric(const __m128i _value) : base8<T>(_value) {}
// Store to array
simdjson_inline void store(T dst[16]) const { return _mm_storeu_si128(reinterpret_cast<__m128i *>(dst), *this); }
// Override to distinguish from bool version
simdjson_inline simd8<T> operator~() const { return *this ^ 0xFFu; }
// Addition/subtraction are the same for signed and unsigned
simdjson_inline simd8<T> operator+(const simd8<T> other) const { return _mm_add_epi8(*this, other); }
simdjson_inline simd8<T> operator-(const simd8<T> other) const { return _mm_sub_epi8(*this, other); }
simdjson_inline simd8<T>& operator+=(const simd8<T> other) { *this = *this + other; return *static_cast<simd8<T>*>(this); }
simdjson_inline simd8<T>& operator-=(const simd8<T> other) { *this = *this - other; return *static_cast<simd8<T>*>(this); }
// Perform a lookup assuming the value is between 0 and 16 (undefined behavior for out of range values)
template<typename L>
simdjson_inline simd8<L> lookup_16(simd8<L> lookup_table) const {
return _mm_shuffle_epi8(lookup_table, *this);
}
// Copies to 'output" all bytes corresponding to a 0 in the mask (interpreted as a bitset).
// Passing a 0 value for mask would be equivalent to writing out every byte to output.
// Only the first 16 - count_ones(mask) bytes of the result are significant but 16 bytes
// get written.
// Design consideration: it seems like a function with the
// signature simd8<L> compress(uint32_t mask) would be
// sensible, but the AVX ISA makes this kind of approach difficult.
template<typename L>
simdjson_inline void compress(uint16_t mask, L * output) const {
using internal::thintable_epi8;
using internal::BitsSetTable256mul2;
using internal::pshufb_combine_table;
// this particular implementation was inspired by work done by @animetosho
// we do it in two steps, first 8 bytes and then second 8 bytes
uint8_t mask1 = uint8_t(mask); // least significant 8 bits
uint8_t mask2 = uint8_t(mask >> 8); // most significant 8 bits
// next line just loads the 64-bit values thintable_epi8[mask1] and
// thintable_epi8[mask2] into a 128-bit register, using only
// two instructions on most compilers.
__m128i shufmask = _mm_set_epi64x(thintable_epi8[mask2], thintable_epi8[mask1]);
// we increment by 0x08 the second half of the mask
shufmask =
_mm_add_epi8(shufmask, _mm_set_epi32(0x08080808, 0x08080808, 0, 0));
// this is the version "nearly pruned"
__m128i pruned = _mm_shuffle_epi8(*this, shufmask);
// we still need to put the two halves together.
// we compute the popcount of the first half:
int pop1 = BitsSetTable256mul2[mask1];
// then load the corresponding mask, what it does is to write
// only the first pop1 bytes from the first 8 bytes, and then
// it fills in with the bytes from the second 8 bytes + some filling
// at the end.
__m128i compactmask =
_mm_loadu_si128(reinterpret_cast<const __m128i *>(pshufb_combine_table + pop1 * 8));
__m128i answer = _mm_shuffle_epi8(pruned, compactmask);
_mm_storeu_si128(reinterpret_cast<__m128i *>(output), answer);
}
template<typename L>
simdjson_inline simd8<L> lookup_16(
L replace0, L replace1, L replace2, L replace3,
L replace4, L replace5, L replace6, L replace7,
L replace8, L replace9, L replace10, L replace11,
L replace12, L replace13, L replace14, L replace15) const {
return lookup_16(simd8<L>::repeat_16(
replace0, replace1, replace2, replace3,
replace4, replace5, replace6, replace7,
replace8, replace9, replace10, replace11,
replace12, replace13, replace14, replace15
));
}
};
// Signed bytes
template<>
struct simd8<int8_t> : base8_numeric<int8_t> {
simdjson_inline simd8() : base8_numeric<int8_t>() {}
simdjson_inline simd8(const __m128i _value) : base8_numeric<int8_t>(_value) {}
// Splat constructor
simdjson_inline simd8(int8_t _value) : simd8(splat(_value)) {}
// Array constructor
simdjson_inline simd8(const int8_t* values) : simd8(load(values)) {}
// Member-by-member initialization
simdjson_inline simd8(
int8_t v0, int8_t v1, int8_t v2, int8_t v3, int8_t v4, int8_t v5, int8_t v6, int8_t v7,
int8_t v8, int8_t v9, int8_t v10, int8_t v11, int8_t v12, int8_t v13, int8_t v14, int8_t v15
) : simd8(_mm_setr_epi8(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
)) {}
// Repeat 16 values as many times as necessary (usually for lookup tables)
simdjson_inline static simd8<int8_t> repeat_16(
int8_t v0, int8_t v1, int8_t v2, int8_t v3, int8_t v4, int8_t v5, int8_t v6, int8_t v7,
int8_t v8, int8_t v9, int8_t v10, int8_t v11, int8_t v12, int8_t v13, int8_t v14, int8_t v15
) {
return simd8<int8_t>(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
);
}
// Order-sensitive comparisons
simdjson_inline simd8<int8_t> max_val(const simd8<int8_t> other) const { return _mm_max_epi8(*this, other); }
simdjson_inline simd8<int8_t> min_val(const simd8<int8_t> other) const { return _mm_min_epi8(*this, other); }
simdjson_inline simd8<bool> operator>(const simd8<int8_t> other) const { return _mm_cmpgt_epi8(*this, other); }
simdjson_inline simd8<bool> operator<(const simd8<int8_t> other) const { return _mm_cmpgt_epi8(other, *this); }
};
// Unsigned bytes
template<>
struct simd8<uint8_t>: base8_numeric<uint8_t> {
simdjson_inline simd8() : base8_numeric<uint8_t>() {}
simdjson_inline simd8(const __m128i _value) : base8_numeric<uint8_t>(_value) {}
// Splat constructor
simdjson_inline simd8(uint8_t _value) : simd8(splat(_value)) {}
// Array constructor
simdjson_inline simd8(const uint8_t* values) : simd8(load(values)) {}
// Member-by-member initialization
simdjson_inline simd8(
uint8_t v0, uint8_t v1, uint8_t v2, uint8_t v3, uint8_t v4, uint8_t v5, uint8_t v6, uint8_t v7,
uint8_t v8, uint8_t v9, uint8_t v10, uint8_t v11, uint8_t v12, uint8_t v13, uint8_t v14, uint8_t v15
) : simd8(_mm_setr_epi8(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
)) {}
// Repeat 16 values as many times as necessary (usually for lookup tables)
simdjson_inline static simd8<uint8_t> repeat_16(
uint8_t v0, uint8_t v1, uint8_t v2, uint8_t v3, uint8_t v4, uint8_t v5, uint8_t v6, uint8_t v7,
uint8_t v8, uint8_t v9, uint8_t v10, uint8_t v11, uint8_t v12, uint8_t v13, uint8_t v14, uint8_t v15
) {
return simd8<uint8_t>(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
);
}
// Saturated math
simdjson_inline simd8<uint8_t> saturating_add(const simd8<uint8_t> other) const { return _mm_adds_epu8(*this, other); }
simdjson_inline simd8<uint8_t> saturating_sub(const simd8<uint8_t> other) const { return _mm_subs_epu8(*this, other); }
// Order-specific operations
simdjson_inline simd8<uint8_t> max_val(const simd8<uint8_t> other) const { return _mm_max_epu8(*this, other); }
simdjson_inline simd8<uint8_t> min_val(const simd8<uint8_t> other) const { return _mm_min_epu8(*this, other); }
// Same as >, but only guarantees true is nonzero (< guarantees true = -1)
simdjson_inline simd8<uint8_t> gt_bits(const simd8<uint8_t> other) const { return this->saturating_sub(other); }
// Same as <, but only guarantees true is nonzero (< guarantees true = -1)
simdjson_inline simd8<uint8_t> lt_bits(const simd8<uint8_t> other) const { return other.saturating_sub(*this); }
simdjson_inline simd8<bool> operator<=(const simd8<uint8_t> other) const { return other.max_val(*this) == other; }
simdjson_inline simd8<bool> operator>=(const simd8<uint8_t> other) const { return other.min_val(*this) == other; }
simdjson_inline simd8<bool> operator>(const simd8<uint8_t> other) const { return this->gt_bits(other).any_bits_set(); }
simdjson_inline simd8<bool> operator<(const simd8<uint8_t> other) const { return this->gt_bits(other).any_bits_set(); }
// Bit-specific operations
simdjson_inline simd8<bool> bits_not_set() const { return *this == uint8_t(0); }
simdjson_inline simd8<bool> bits_not_set(simd8<uint8_t> bits) const { return (*this & bits).bits_not_set(); }
simdjson_inline simd8<bool> any_bits_set() const { return ~this->bits_not_set(); }
simdjson_inline simd8<bool> any_bits_set(simd8<uint8_t> bits) const { return ~this->bits_not_set(bits); }
simdjson_inline bool is_ascii() const { return _mm_movemask_epi8(*this) == 0; }
simdjson_inline bool bits_not_set_anywhere() const { return _mm_testz_si128(*this, *this); }
simdjson_inline bool any_bits_set_anywhere() const { return !bits_not_set_anywhere(); }
simdjson_inline bool bits_not_set_anywhere(simd8<uint8_t> bits) const { return _mm_testz_si128(*this, bits); }
simdjson_inline bool any_bits_set_anywhere(simd8<uint8_t> bits) const { return !bits_not_set_anywhere(bits); }
template<int N>
simdjson_inline simd8<uint8_t> shr() const { return simd8<uint8_t>(_mm_srli_epi16(*this, N)) & uint8_t(0xFFu >> N); }
template<int N>
simdjson_inline simd8<uint8_t> shl() const { return simd8<uint8_t>(_mm_slli_epi16(*this, N)) & uint8_t(0xFFu << N); }
// Get one of the bits and make a bitmask out of it.
// e.g. value.get_bit<7>() gets the high bit
template<int N>
simdjson_inline int get_bit() const { return _mm_movemask_epi8(_mm_slli_epi16(*this, 7-N)); }
};
template<typename T>
struct simd8x64 {
static constexpr int NUM_CHUNKS = 64 / sizeof(simd8<T>);
static_assert(NUM_CHUNKS == 4, "Westmere kernel should use four registers per 64-byte block.");
const simd8<T> chunks[NUM_CHUNKS];
simd8x64(const simd8x64<T>& o) = delete; // no copy allowed
simd8x64<T>& operator=(const simd8<T>& other) = delete; // no assignment allowed
simd8x64() = delete; // no default constructor allowed
simdjson_inline simd8x64(const simd8<T> chunk0, const simd8<T> chunk1, const simd8<T> chunk2, const simd8<T> chunk3) : chunks{chunk0, chunk1, chunk2, chunk3} {}
simdjson_inline simd8x64(const T ptr[64]) : chunks{simd8<T>::load(ptr), simd8<T>::load(ptr+16), simd8<T>::load(ptr+32), simd8<T>::load(ptr+48)} {}
simdjson_inline void store(T ptr[64]) const {
this->chunks[0].store(ptr+sizeof(simd8<T>)*0);
this->chunks[1].store(ptr+sizeof(simd8<T>)*1);
this->chunks[2].store(ptr+sizeof(simd8<T>)*2);
this->chunks[3].store(ptr+sizeof(simd8<T>)*3);
}
simdjson_inline simd8<T> reduce_or() const {
return (this->chunks[0] | this->chunks[1]) | (this->chunks[2] | this->chunks[3]);
}
simdjson_inline uint64_t compress(uint64_t mask, T * output) const {
this->chunks[0].compress(uint16_t(mask), output);
this->chunks[1].compress(uint16_t(mask >> 16), output + 16 - count_ones(mask & 0xFFFF));
this->chunks[2].compress(uint16_t(mask >> 32), output + 32 - count_ones(mask & 0xFFFFFFFF));
this->chunks[3].compress(uint16_t(mask >> 48), output + 48 - count_ones(mask & 0xFFFFFFFFFFFF));
return 64 - count_ones(mask);
}
simdjson_inline uint64_t to_bitmask() const {
uint64_t r0 = uint32_t(this->chunks[0].to_bitmask() );
uint64_t r1 = this->chunks[1].to_bitmask() ;
uint64_t r2 = this->chunks[2].to_bitmask() ;
uint64_t r3 = this->chunks[3].to_bitmask() ;
return r0 | (r1 << 16) | (r2 << 32) | (r3 << 48);
}
simdjson_inline uint64_t eq(const T m) const {
const simd8<T> mask = simd8<T>::splat(m);
return simd8x64<bool>(
this->chunks[0] == mask,
this->chunks[1] == mask,
this->chunks[2] == mask,
this->chunks[3] == mask
).to_bitmask();
}
simdjson_inline uint64_t eq(const simd8x64<uint8_t> &other) const {
return simd8x64<bool>(
this->chunks[0] == other.chunks[0],
this->chunks[1] == other.chunks[1],
this->chunks[2] == other.chunks[2],
this->chunks[3] == other.chunks[3]
).to_bitmask();
}
simdjson_inline uint64_t lteq(const T m) const {
const simd8<T> mask = simd8<T>::splat(m);
return simd8x64<bool>(
this->chunks[0] <= mask,
this->chunks[1] <= mask,
this->chunks[2] <= mask,
this->chunks[3] <= mask
).to_bitmask();
}
}; // struct simd8x64<T>
} // namespace simd
} // unnamed namespace
} // namespace westmere
} // namespace simdjson
#endif // SIMDJSON_WESTMERE_SIMD_INPUT_H
/* end file simdjson/westmere/simd.h */
/* including simdjson/westmere/stringparsing_defs.h: #include "simdjson/westmere/stringparsing_defs.h" */
/* begin file simdjson/westmere/stringparsing_defs.h */
#ifndef SIMDJSON_WESTMERE_STRINGPARSING_DEFS_H
#define SIMDJSON_WESTMERE_STRINGPARSING_DEFS_H
/* including simdjson/westmere/bitmanipulation.h: #include "simdjson/westmere/bitmanipulation.h" */
/* begin file simdjson/westmere/bitmanipulation.h */
#ifndef SIMDJSON_WESTMERE_BITMANIPULATION_H
#define SIMDJSON_WESTMERE_BITMANIPULATION_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/westmere/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/westmere/intrinsics.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace westmere {
namespace {
// We sometimes call trailing_zero on inputs that are zero,
// but the algorithms do not end up using the returned value.
// Sadly, sanitizers are not smart enough to figure it out.
SIMDJSON_NO_SANITIZE_UNDEFINED
// This function can be used safely even if not all bytes have been
// initialized.
// See issue https://github.com/simdjson/simdjson/issues/1965
SIMDJSON_NO_SANITIZE_MEMORY
simdjson_inline int trailing_zeroes(uint64_t input_num) {
#if SIMDJSON_REGULAR_VISUAL_STUDIO
unsigned long ret;
// Search the mask data from least significant bit (LSB)
// to the most significant bit (MSB) for a set bit (1).
_BitScanForward64(&ret, input_num);
return (int)ret;
#else // SIMDJSON_REGULAR_VISUAL_STUDIO
return __builtin_ctzll(input_num);
#endif // SIMDJSON_REGULAR_VISUAL_STUDIO
}
/* result might be undefined when input_num is zero */
simdjson_inline uint64_t clear_lowest_bit(uint64_t input_num) {
return input_num & (input_num-1);
}
/* result might be undefined when input_num is zero */
simdjson_inline int leading_zeroes(uint64_t input_num) {
#if SIMDJSON_REGULAR_VISUAL_STUDIO
unsigned long leading_zero = 0;
// Search the mask data from most significant bit (MSB)
// to least significant bit (LSB) for a set bit (1).
if (_BitScanReverse64(&leading_zero, input_num))
return (int)(63 - leading_zero);
else
return 64;
#else
return __builtin_clzll(input_num);
#endif// SIMDJSON_REGULAR_VISUAL_STUDIO
}
#if SIMDJSON_REGULAR_VISUAL_STUDIO
simdjson_inline unsigned __int64 count_ones(uint64_t input_num) {
// note: we do not support legacy 32-bit Windows in this kernel
return __popcnt64(input_num);// Visual Studio wants two underscores
}
#else
simdjson_inline long long int count_ones(uint64_t input_num) {
return _popcnt64(input_num);
}
#endif
simdjson_inline bool add_overflow(uint64_t value1, uint64_t value2,
uint64_t *result) {
#if SIMDJSON_REGULAR_VISUAL_STUDIO
return _addcarry_u64(0, value1, value2,
reinterpret_cast<unsigned __int64 *>(result));
#else
return __builtin_uaddll_overflow(value1, value2,
reinterpret_cast<unsigned long long *>(result));
#endif
}
} // unnamed namespace
} // namespace westmere
} // namespace simdjson
#endif // SIMDJSON_WESTMERE_BITMANIPULATION_H
/* end file simdjson/westmere/bitmanipulation.h */
/* including simdjson/westmere/simd.h: #include "simdjson/westmere/simd.h" */
/* begin file simdjson/westmere/simd.h */
#ifndef SIMDJSON_WESTMERE_SIMD_H
#define SIMDJSON_WESTMERE_SIMD_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/westmere/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/westmere/bitmanipulation.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/simdprune_tables.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace westmere {
namespace {
namespace simd {
template<typename Child>
struct base {
__m128i value;
// Zero constructor
simdjson_inline base() : value{__m128i()} {}
// Conversion from SIMD register
simdjson_inline base(const __m128i _value) : value(_value) {}
// Conversion to SIMD register
simdjson_inline operator const __m128i&() const { return this->value; }
simdjson_inline operator __m128i&() { return this->value; }
// Bit operations
simdjson_inline Child operator|(const Child other) const { return _mm_or_si128(*this, other); }
simdjson_inline Child operator&(const Child other) const { return _mm_and_si128(*this, other); }
simdjson_inline Child operator^(const Child other) const { return _mm_xor_si128(*this, other); }
simdjson_inline Child bit_andnot(const Child other) const { return _mm_andnot_si128(other, *this); }
simdjson_inline Child& operator|=(const Child other) { auto this_cast = static_cast<Child*>(this); *this_cast = *this_cast | other; return *this_cast; }
simdjson_inline Child& operator&=(const Child other) { auto this_cast = static_cast<Child*>(this); *this_cast = *this_cast & other; return *this_cast; }
simdjson_inline Child& operator^=(const Child other) { auto this_cast = static_cast<Child*>(this); *this_cast = *this_cast ^ other; return *this_cast; }
};
template<typename T, typename Mask=simd8<bool>>
struct base8: base<simd8<T>> {
typedef uint16_t bitmask_t;
typedef uint32_t bitmask2_t;
simdjson_inline base8() : base<simd8<T>>() {}
simdjson_inline base8(const __m128i _value) : base<simd8<T>>(_value) {}
friend simdjson_inline Mask operator==(const simd8<T> lhs, const simd8<T> rhs) { return _mm_cmpeq_epi8(lhs, rhs); }
static const int SIZE = sizeof(base<simd8<T>>::value);
template<int N=1>
simdjson_inline simd8<T> prev(const simd8<T> prev_chunk) const {
return _mm_alignr_epi8(*this, prev_chunk, 16 - N);
}
};
// SIMD byte mask type (returned by things like eq and gt)
template<>
struct simd8<bool>: base8<bool> {
static simdjson_inline simd8<bool> splat(bool _value) { return _mm_set1_epi8(uint8_t(-(!!_value))); }
simdjson_inline simd8<bool>() : base8() {}
simdjson_inline simd8<bool>(const __m128i _value) : base8<bool>(_value) {}
// Splat constructor
simdjson_inline simd8<bool>(bool _value) : base8<bool>(splat(_value)) {}
simdjson_inline int to_bitmask() const { return _mm_movemask_epi8(*this); }
simdjson_inline bool any() const { return !_mm_testz_si128(*this, *this); }
simdjson_inline simd8<bool> operator~() const { return *this ^ true; }
};
template<typename T>
struct base8_numeric: base8<T> {
static simdjson_inline simd8<T> splat(T _value) { return _mm_set1_epi8(_value); }
static simdjson_inline simd8<T> zero() { return _mm_setzero_si128(); }
static simdjson_inline simd8<T> load(const T values[16]) {
return _mm_loadu_si128(reinterpret_cast<const __m128i *>(values));
}
// Repeat 16 values as many times as necessary (usually for lookup tables)
static simdjson_inline simd8<T> repeat_16(
T v0, T v1, T v2, T v3, T v4, T v5, T v6, T v7,
T v8, T v9, T v10, T v11, T v12, T v13, T v14, T v15
) {
return simd8<T>(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
);
}
simdjson_inline base8_numeric() : base8<T>() {}
simdjson_inline base8_numeric(const __m128i _value) : base8<T>(_value) {}
// Store to array
simdjson_inline void store(T dst[16]) const { return _mm_storeu_si128(reinterpret_cast<__m128i *>(dst), *this); }
// Override to distinguish from bool version
simdjson_inline simd8<T> operator~() const { return *this ^ 0xFFu; }
// Addition/subtraction are the same for signed and unsigned
simdjson_inline simd8<T> operator+(const simd8<T> other) const { return _mm_add_epi8(*this, other); }
simdjson_inline simd8<T> operator-(const simd8<T> other) const { return _mm_sub_epi8(*this, other); }
simdjson_inline simd8<T>& operator+=(const simd8<T> other) { *this = *this + other; return *static_cast<simd8<T>*>(this); }
simdjson_inline simd8<T>& operator-=(const simd8<T> other) { *this = *this - other; return *static_cast<simd8<T>*>(this); }
// Perform a lookup assuming the value is between 0 and 16 (undefined behavior for out of range values)
template<typename L>
simdjson_inline simd8<L> lookup_16(simd8<L> lookup_table) const {
return _mm_shuffle_epi8(lookup_table, *this);
}
// Copies to 'output" all bytes corresponding to a 0 in the mask (interpreted as a bitset).
// Passing a 0 value for mask would be equivalent to writing out every byte to output.
// Only the first 16 - count_ones(mask) bytes of the result are significant but 16 bytes
// get written.
// Design consideration: it seems like a function with the
// signature simd8<L> compress(uint32_t mask) would be
// sensible, but the AVX ISA makes this kind of approach difficult.
template<typename L>
simdjson_inline void compress(uint16_t mask, L * output) const {
using internal::thintable_epi8;
using internal::BitsSetTable256mul2;
using internal::pshufb_combine_table;
// this particular implementation was inspired by work done by @animetosho
// we do it in two steps, first 8 bytes and then second 8 bytes
uint8_t mask1 = uint8_t(mask); // least significant 8 bits
uint8_t mask2 = uint8_t(mask >> 8); // most significant 8 bits
// next line just loads the 64-bit values thintable_epi8[mask1] and
// thintable_epi8[mask2] into a 128-bit register, using only
// two instructions on most compilers.
__m128i shufmask = _mm_set_epi64x(thintable_epi8[mask2], thintable_epi8[mask1]);
// we increment by 0x08 the second half of the mask
shufmask =
_mm_add_epi8(shufmask, _mm_set_epi32(0x08080808, 0x08080808, 0, 0));
// this is the version "nearly pruned"
__m128i pruned = _mm_shuffle_epi8(*this, shufmask);
// we still need to put the two halves together.
// we compute the popcount of the first half:
int pop1 = BitsSetTable256mul2[mask1];
// then load the corresponding mask, what it does is to write
// only the first pop1 bytes from the first 8 bytes, and then
// it fills in with the bytes from the second 8 bytes + some filling
// at the end.
__m128i compactmask =
_mm_loadu_si128(reinterpret_cast<const __m128i *>(pshufb_combine_table + pop1 * 8));
__m128i answer = _mm_shuffle_epi8(pruned, compactmask);
_mm_storeu_si128(reinterpret_cast<__m128i *>(output), answer);
}
template<typename L>
simdjson_inline simd8<L> lookup_16(
L replace0, L replace1, L replace2, L replace3,
L replace4, L replace5, L replace6, L replace7,
L replace8, L replace9, L replace10, L replace11,
L replace12, L replace13, L replace14, L replace15) const {
return lookup_16(simd8<L>::repeat_16(
replace0, replace1, replace2, replace3,
replace4, replace5, replace6, replace7,
replace8, replace9, replace10, replace11,
replace12, replace13, replace14, replace15
));
}
};
// Signed bytes
template<>
struct simd8<int8_t> : base8_numeric<int8_t> {
simdjson_inline simd8() : base8_numeric<int8_t>() {}
simdjson_inline simd8(const __m128i _value) : base8_numeric<int8_t>(_value) {}
// Splat constructor
simdjson_inline simd8(int8_t _value) : simd8(splat(_value)) {}
// Array constructor
simdjson_inline simd8(const int8_t* values) : simd8(load(values)) {}
// Member-by-member initialization
simdjson_inline simd8(
int8_t v0, int8_t v1, int8_t v2, int8_t v3, int8_t v4, int8_t v5, int8_t v6, int8_t v7,
int8_t v8, int8_t v9, int8_t v10, int8_t v11, int8_t v12, int8_t v13, int8_t v14, int8_t v15
) : simd8(_mm_setr_epi8(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
)) {}
// Repeat 16 values as many times as necessary (usually for lookup tables)
simdjson_inline static simd8<int8_t> repeat_16(
int8_t v0, int8_t v1, int8_t v2, int8_t v3, int8_t v4, int8_t v5, int8_t v6, int8_t v7,
int8_t v8, int8_t v9, int8_t v10, int8_t v11, int8_t v12, int8_t v13, int8_t v14, int8_t v15
) {
return simd8<int8_t>(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
);
}
// Order-sensitive comparisons
simdjson_inline simd8<int8_t> max_val(const simd8<int8_t> other) const { return _mm_max_epi8(*this, other); }
simdjson_inline simd8<int8_t> min_val(const simd8<int8_t> other) const { return _mm_min_epi8(*this, other); }
simdjson_inline simd8<bool> operator>(const simd8<int8_t> other) const { return _mm_cmpgt_epi8(*this, other); }
simdjson_inline simd8<bool> operator<(const simd8<int8_t> other) const { return _mm_cmpgt_epi8(other, *this); }
};
// Unsigned bytes
template<>
struct simd8<uint8_t>: base8_numeric<uint8_t> {
simdjson_inline simd8() : base8_numeric<uint8_t>() {}
simdjson_inline simd8(const __m128i _value) : base8_numeric<uint8_t>(_value) {}
// Splat constructor
simdjson_inline simd8(uint8_t _value) : simd8(splat(_value)) {}
// Array constructor
simdjson_inline simd8(const uint8_t* values) : simd8(load(values)) {}
// Member-by-member initialization
simdjson_inline simd8(
uint8_t v0, uint8_t v1, uint8_t v2, uint8_t v3, uint8_t v4, uint8_t v5, uint8_t v6, uint8_t v7,
uint8_t v8, uint8_t v9, uint8_t v10, uint8_t v11, uint8_t v12, uint8_t v13, uint8_t v14, uint8_t v15
) : simd8(_mm_setr_epi8(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
)) {}
// Repeat 16 values as many times as necessary (usually for lookup tables)
simdjson_inline static simd8<uint8_t> repeat_16(
uint8_t v0, uint8_t v1, uint8_t v2, uint8_t v3, uint8_t v4, uint8_t v5, uint8_t v6, uint8_t v7,
uint8_t v8, uint8_t v9, uint8_t v10, uint8_t v11, uint8_t v12, uint8_t v13, uint8_t v14, uint8_t v15
) {
return simd8<uint8_t>(
v0, v1, v2, v3, v4, v5, v6, v7,
v8, v9, v10,v11,v12,v13,v14,v15
);
}
// Saturated math
simdjson_inline simd8<uint8_t> saturating_add(const simd8<uint8_t> other) const { return _mm_adds_epu8(*this, other); }
simdjson_inline simd8<uint8_t> saturating_sub(const simd8<uint8_t> other) const { return _mm_subs_epu8(*this, other); }
// Order-specific operations
simdjson_inline simd8<uint8_t> max_val(const simd8<uint8_t> other) const { return _mm_max_epu8(*this, other); }
simdjson_inline simd8<uint8_t> min_val(const simd8<uint8_t> other) const { return _mm_min_epu8(*this, other); }
// Same as >, but only guarantees true is nonzero (< guarantees true = -1)
simdjson_inline simd8<uint8_t> gt_bits(const simd8<uint8_t> other) const { return this->saturating_sub(other); }
// Same as <, but only guarantees true is nonzero (< guarantees true = -1)
simdjson_inline simd8<uint8_t> lt_bits(const simd8<uint8_t> other) const { return other.saturating_sub(*this); }
simdjson_inline simd8<bool> operator<=(const simd8<uint8_t> other) const { return other.max_val(*this) == other; }
simdjson_inline simd8<bool> operator>=(const simd8<uint8_t> other) const { return other.min_val(*this) == other; }
simdjson_inline simd8<bool> operator>(const simd8<uint8_t> other) const { return this->gt_bits(other).any_bits_set(); }
simdjson_inline simd8<bool> operator<(const simd8<uint8_t> other) const { return this->gt_bits(other).any_bits_set(); }
// Bit-specific operations
simdjson_inline simd8<bool> bits_not_set() const { return *this == uint8_t(0); }
simdjson_inline simd8<bool> bits_not_set(simd8<uint8_t> bits) const { return (*this & bits).bits_not_set(); }
simdjson_inline simd8<bool> any_bits_set() const { return ~this->bits_not_set(); }
simdjson_inline simd8<bool> any_bits_set(simd8<uint8_t> bits) const { return ~this->bits_not_set(bits); }
simdjson_inline bool is_ascii() const { return _mm_movemask_epi8(*this) == 0; }
simdjson_inline bool bits_not_set_anywhere() const { return _mm_testz_si128(*this, *this); }
simdjson_inline bool any_bits_set_anywhere() const { return !bits_not_set_anywhere(); }
simdjson_inline bool bits_not_set_anywhere(simd8<uint8_t> bits) const { return _mm_testz_si128(*this, bits); }
simdjson_inline bool any_bits_set_anywhere(simd8<uint8_t> bits) const { return !bits_not_set_anywhere(bits); }
template<int N>
simdjson_inline simd8<uint8_t> shr() const { return simd8<uint8_t>(_mm_srli_epi16(*this, N)) & uint8_t(0xFFu >> N); }
template<int N>
simdjson_inline simd8<uint8_t> shl() const { return simd8<uint8_t>(_mm_slli_epi16(*this, N)) & uint8_t(0xFFu << N); }
// Get one of the bits and make a bitmask out of it.
// e.g. value.get_bit<7>() gets the high bit
template<int N>
simdjson_inline int get_bit() const { return _mm_movemask_epi8(_mm_slli_epi16(*this, 7-N)); }
};
template<typename T>
struct simd8x64 {
static constexpr int NUM_CHUNKS = 64 / sizeof(simd8<T>);
static_assert(NUM_CHUNKS == 4, "Westmere kernel should use four registers per 64-byte block.");
const simd8<T> chunks[NUM_CHUNKS];
simd8x64(const simd8x64<T>& o) = delete; // no copy allowed
simd8x64<T>& operator=(const simd8<T>& other) = delete; // no assignment allowed
simd8x64() = delete; // no default constructor allowed
simdjson_inline simd8x64(const simd8<T> chunk0, const simd8<T> chunk1, const simd8<T> chunk2, const simd8<T> chunk3) : chunks{chunk0, chunk1, chunk2, chunk3} {}
simdjson_inline simd8x64(const T ptr[64]) : chunks{simd8<T>::load(ptr), simd8<T>::load(ptr+16), simd8<T>::load(ptr+32), simd8<T>::load(ptr+48)} {}
simdjson_inline void store(T ptr[64]) const {
this->chunks[0].store(ptr+sizeof(simd8<T>)*0);
this->chunks[1].store(ptr+sizeof(simd8<T>)*1);
this->chunks[2].store(ptr+sizeof(simd8<T>)*2);
this->chunks[3].store(ptr+sizeof(simd8<T>)*3);
}
simdjson_inline simd8<T> reduce_or() const {
return (this->chunks[0] | this->chunks[1]) | (this->chunks[2] | this->chunks[3]);
}
simdjson_inline uint64_t compress(uint64_t mask, T * output) const {
this->chunks[0].compress(uint16_t(mask), output);
this->chunks[1].compress(uint16_t(mask >> 16), output + 16 - count_ones(mask & 0xFFFF));
this->chunks[2].compress(uint16_t(mask >> 32), output + 32 - count_ones(mask & 0xFFFFFFFF));
this->chunks[3].compress(uint16_t(mask >> 48), output + 48 - count_ones(mask & 0xFFFFFFFFFFFF));
return 64 - count_ones(mask);
}
simdjson_inline uint64_t to_bitmask() const {
uint64_t r0 = uint32_t(this->chunks[0].to_bitmask() );
uint64_t r1 = this->chunks[1].to_bitmask() ;
uint64_t r2 = this->chunks[2].to_bitmask() ;
uint64_t r3 = this->chunks[3].to_bitmask() ;
return r0 | (r1 << 16) | (r2 << 32) | (r3 << 48);
}
simdjson_inline uint64_t eq(const T m) const {
const simd8<T> mask = simd8<T>::splat(m);
return simd8x64<bool>(
this->chunks[0] == mask,
this->chunks[1] == mask,
this->chunks[2] == mask,
this->chunks[3] == mask
).to_bitmask();
}
simdjson_inline uint64_t eq(const simd8x64<uint8_t> &other) const {
return simd8x64<bool>(
this->chunks[0] == other.chunks[0],
this->chunks[1] == other.chunks[1],
this->chunks[2] == other.chunks[2],
this->chunks[3] == other.chunks[3]
).to_bitmask();
}
simdjson_inline uint64_t lteq(const T m) const {
const simd8<T> mask = simd8<T>::splat(m);
return simd8x64<bool>(
this->chunks[0] <= mask,
this->chunks[1] <= mask,
this->chunks[2] <= mask,
this->chunks[3] <= mask
).to_bitmask();
}
}; // struct simd8x64<T>
} // namespace simd
} // unnamed namespace
} // namespace westmere
} // namespace simdjson
#endif // SIMDJSON_WESTMERE_SIMD_INPUT_H
/* end file simdjson/westmere/simd.h */
namespace simdjson {
namespace westmere {
namespace {
using namespace simd;
// Holds backslashes and quotes locations.
struct backslash_and_quote {
public:
static constexpr uint32_t BYTES_PROCESSED = 32;
simdjson_inline static backslash_and_quote copy_and_find(const uint8_t *src, uint8_t *dst);
simdjson_inline bool has_quote_first() { return ((bs_bits - 1) & quote_bits) != 0; }
simdjson_inline bool has_backslash() { return bs_bits != 0; }
simdjson_inline int quote_index() { return trailing_zeroes(quote_bits); }
simdjson_inline int backslash_index() { return trailing_zeroes(bs_bits); }
uint32_t bs_bits;
uint32_t quote_bits;
}; // struct backslash_and_quote
simdjson_inline backslash_and_quote backslash_and_quote::copy_and_find(const uint8_t *src, uint8_t *dst) {
// this can read up to 31 bytes beyond the buffer size, but we require
// SIMDJSON_PADDING of padding
static_assert(SIMDJSON_PADDING >= (BYTES_PROCESSED - 1), "backslash and quote finder must process fewer than SIMDJSON_PADDING bytes");
simd8<uint8_t> v0(src);
simd8<uint8_t> v1(src + 16);
v0.store(dst);
v1.store(dst + 16);
uint64_t bs_and_quote = simd8x64<bool>(v0 == '\\', v1 == '\\', v0 == '"', v1 == '"').to_bitmask();
return {
uint32_t(bs_and_quote), // bs_bits
uint32_t(bs_and_quote >> 32) // quote_bits
};
}
} // unnamed namespace
} // namespace westmere
} // namespace simdjson
#endif // SIMDJSON_WESTMERE_STRINGPARSING_DEFS_H
/* end file simdjson/westmere/stringparsing_defs.h */
/* end file simdjson/westmere/begin.h */
/* including generic/amalgamated.h for westmere: #include <generic/amalgamated.h> */
/* begin file generic/amalgamated.h for westmere */
#if defined(SIMDJSON_CONDITIONAL_INCLUDE) && !defined(SIMDJSON_SRC_GENERIC_DEPENDENCIES_H)
#error generic/dependencies.h must be included before generic/amalgamated.h!
#endif
/* including generic/base.h for westmere: #include <generic/base.h> */
/* begin file generic/base.h for westmere */
#ifndef SIMDJSON_SRC_GENERIC_BASE_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_BASE_H */
/* amalgamation skipped (editor-only): #include <base.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/base.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace westmere {
namespace {
struct json_character_block;
} // unnamed namespace
} // namespace westmere
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_BASE_H
/* end file generic/base.h for westmere */
/* including generic/dom_parser_implementation.h for westmere: #include <generic/dom_parser_implementation.h> */
/* begin file generic/dom_parser_implementation.h for westmere */
#ifndef SIMDJSON_SRC_GENERIC_DOM_PARSER_IMPLEMENTATION_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_DOM_PARSER_IMPLEMENTATION_H */
/* amalgamation skipped (editor-only): #include <generic/base.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/dom_parser_implementation.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
// Interface a dom parser implementation must fulfill
namespace simdjson {
namespace westmere {
namespace {
simdjson_inline simd8<uint8_t> must_be_2_3_continuation(const simd8<uint8_t> prev2, const simd8<uint8_t> prev3);
simdjson_inline bool is_ascii(const simd8x64<uint8_t>& input);
} // unnamed namespace
} // namespace westmere
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_DOM_PARSER_IMPLEMENTATION_H
/* end file generic/dom_parser_implementation.h for westmere */
/* including generic/json_character_block.h for westmere: #include <generic/json_character_block.h> */
/* begin file generic/json_character_block.h for westmere */
#ifndef SIMDJSON_SRC_GENERIC_JSON_CHARACTER_BLOCK_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_JSON_CHARACTER_BLOCK_H */
/* amalgamation skipped (editor-only): #include <generic/base.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace westmere {
namespace {
struct json_character_block {
static simdjson_inline json_character_block classify(const simd::simd8x64<uint8_t>& in);
simdjson_inline uint64_t whitespace() const noexcept { return _whitespace; }
simdjson_inline uint64_t op() const noexcept { return _op; }
simdjson_inline uint64_t scalar() const noexcept { return ~(op() | whitespace()); }
uint64_t _whitespace;
uint64_t _op;
};
} // unnamed namespace
} // namespace westmere
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_JSON_CHARACTER_BLOCK_H
/* end file generic/json_character_block.h for westmere */
/* end file generic/amalgamated.h for westmere */
/* including generic/stage1/amalgamated.h for westmere: #include <generic/stage1/amalgamated.h> */
/* begin file generic/stage1/amalgamated.h for westmere */
// Stuff other things depend on
/* including generic/stage1/base.h for westmere: #include <generic/stage1/base.h> */
/* begin file generic/stage1/base.h for westmere */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_BASE_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_BASE_H */
/* amalgamation skipped (editor-only): #include <generic/base.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace westmere {
namespace {
namespace stage1 {
class bit_indexer;
template<size_t STEP_SIZE>
struct buf_block_reader;
struct json_block;
class json_minifier;
class json_scanner;
struct json_string_block;
class json_string_scanner;
class json_structural_indexer;
} // namespace stage1
namespace utf8_validation {
struct utf8_checker;
} // namespace utf8_validation
using utf8_validation::utf8_checker;
} // unnamed namespace
} // namespace westmere
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE1_BASE_H
/* end file generic/stage1/base.h for westmere */
/* including generic/stage1/buf_block_reader.h for westmere: #include <generic/stage1/buf_block_reader.h> */
/* begin file generic/stage1/buf_block_reader.h for westmere */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_BUF_BLOCK_READER_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_BUF_BLOCK_READER_H */
/* amalgamation skipped (editor-only): #include <generic/stage1/base.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#include <cstring>
namespace simdjson {
namespace westmere {
namespace {
namespace stage1 {
// Walks through a buffer in block-sized increments, loading the last part with spaces
template<size_t STEP_SIZE>
struct buf_block_reader {
public:
simdjson_inline buf_block_reader(const uint8_t *_buf, size_t _len);
simdjson_inline size_t block_index();
simdjson_inline bool has_full_block() const;
simdjson_inline const uint8_t *full_block() const;
/**
* Get the last block, padded with spaces.
*
* There will always be a last block, with at least 1 byte, unless len == 0 (in which case this
* function fills the buffer with spaces and returns 0. In particular, if len == STEP_SIZE there
* will be 0 full_blocks and 1 remainder block with STEP_SIZE bytes and no spaces for padding.
*
* @return the number of effective characters in the last block.
*/
simdjson_inline size_t get_remainder(uint8_t *dst) const;
simdjson_inline void advance();
private:
const uint8_t *buf;
const size_t len;
const size_t lenminusstep;
size_t idx;
};
// Routines to print masks and text for debugging bitmask operations
simdjson_unused static char * format_input_text_64(const uint8_t *text) {
static char buf[sizeof(simd8x64<uint8_t>) + 1];
for (size_t i=0; i<sizeof(simd8x64<uint8_t>); i++) {
buf[i] = int8_t(text[i]) < ' ' ? '_' : int8_t(text[i]);
}
buf[sizeof(simd8x64<uint8_t>)] = '\0';
return buf;
}
// Routines to print masks and text for debugging bitmask operations
simdjson_unused static char * format_input_text(const simd8x64<uint8_t>& in) {
static char buf[sizeof(simd8x64<uint8_t>) + 1];
in.store(reinterpret_cast<uint8_t*>(buf));
for (size_t i=0; i<sizeof(simd8x64<uint8_t>); i++) {
if (buf[i] < ' ') { buf[i] = '_'; }
}
buf[sizeof(simd8x64<uint8_t>)] = '\0';
return buf;
}
simdjson_unused static char * format_input_text(const simd8x64<uint8_t>& in, uint64_t mask) {
static char buf[sizeof(simd8x64<uint8_t>) + 1];
in.store(reinterpret_cast<uint8_t*>(buf));
for (size_t i=0; i<sizeof(simd8x64<uint8_t>); i++) {
if (buf[i] <= ' ') { buf[i] = '_'; }
if (!(mask & (size_t(1) << i))) { buf[i] = ' '; }
}
buf[sizeof(simd8x64<uint8_t>)] = '\0';
return buf;
}
simdjson_unused static char * format_mask(uint64_t mask) {
static char buf[sizeof(simd8x64<uint8_t>) + 1];
for (size_t i=0; i<64; i++) {
buf[i] = (mask & (size_t(1) << i)) ? 'X' : ' ';
}
buf[64] = '\0';
return buf;
}
template<size_t STEP_SIZE>
simdjson_inline buf_block_reader<STEP_SIZE>::buf_block_reader(const uint8_t *_buf, size_t _len) : buf{_buf}, len{_len}, lenminusstep{len < STEP_SIZE ? 0 : len - STEP_SIZE}, idx{0} {}
template<size_t STEP_SIZE>
simdjson_inline size_t buf_block_reader<STEP_SIZE>::block_index() { return idx; }
template<size_t STEP_SIZE>
simdjson_inline bool buf_block_reader<STEP_SIZE>::has_full_block() const {
return idx < lenminusstep;
}
template<size_t STEP_SIZE>
simdjson_inline const uint8_t *buf_block_reader<STEP_SIZE>::full_block() const {
return &buf[idx];
}
template<size_t STEP_SIZE>
simdjson_inline size_t buf_block_reader<STEP_SIZE>::get_remainder(uint8_t *dst) const {
if(len == idx) { return 0; } // memcpy(dst, null, 0) will trigger an error with some sanitizers
std::memset(dst, 0x20, STEP_SIZE); // std::memset STEP_SIZE because it's more efficient to write out 8 or 16 bytes at once.
std::memcpy(dst, buf + idx, len - idx);
return len - idx;
}
template<size_t STEP_SIZE>
simdjson_inline void buf_block_reader<STEP_SIZE>::advance() {
idx += STEP_SIZE;
}
} // namespace stage1
} // unnamed namespace
} // namespace westmere
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE1_BUF_BLOCK_READER_H
/* end file generic/stage1/buf_block_reader.h for westmere */
/* including generic/stage1/json_escape_scanner.h for westmere: #include <generic/stage1/json_escape_scanner.h> */
/* begin file generic/stage1/json_escape_scanner.h for westmere */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_JSON_ESCAPE_SCANNER_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_JSON_ESCAPE_SCANNER_H */
/* amalgamation skipped (editor-only): #include <generic/stage1/base.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/buf_block_reader.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace westmere {
namespace {
namespace stage1 {
/**
* Scans for escape characters in JSON, taking care with multiple backslashes (\\n vs. \n).
*/
struct json_escape_scanner {
/** The actual escape characters (the backslashes themselves). */
uint64_t next_is_escaped = 0ULL;
struct escaped_and_escape {
/**
* Mask of escaped characters.
*
* ```
* \n \\n \\\n \\\\n \
* 0100100010100101000
* n \ \ n \ \
* ```
*/
uint64_t escaped;
/**
* Mask of escape characters.
*
* ```
* \n \\n \\\n \\\\n \
* 1001000101001010001
* \ \ \ \ \ \ \
* ```
*/
uint64_t escape;
};
/**
* Get a mask of both escape and escaped characters (the characters following a backslash).
*
* @param potential_escape A mask of the character that can escape others (but could be
* escaped itself). e.g. block.eq('\\')
*/
simdjson_really_inline escaped_and_escape next(uint64_t backslash) noexcept {
#if !SIMDJSON_SKIP_BACKSLASH_SHORT_CIRCUIT
if (!backslash) { return {next_escaped_without_backslashes(), 0}; }
#endif
// | | Mask (shows characters instead of 1's) | Depth | Instructions |
// |--------------------------------|----------------------------------------|-------|---------------------|
// | string | `\\n_\\\n___\\\n___\\\\___\\\\__\\\` | | |
// | | ` even odd even odd odd` | | |
// | potential_escape | ` \ \\\ \\\ \\\\ \\\\ \\\` | 1 | 1 (backslash & ~first_is_escaped)
// | escape_and_terminal_code | ` \n \ \n \ \n \ \ \ \ \ \` | 5 | 5 (next_escape_and_terminal_code())
// | escaped | `\ \ n \ n \ \ \ \ \ ` X | 6 | 7 (escape_and_terminal_code ^ (potential_escape | first_is_escaped))
// | escape | ` \ \ \ \ \ \ \ \ \ \` | 6 | 8 (escape_and_terminal_code & backslash)
// | first_is_escaped | `\ ` | 7 (*) | 9 (escape >> 63) ()
// (*) this is not needed until the next iteration
uint64_t escape_and_terminal_code = next_escape_and_terminal_code(backslash & ~this->next_is_escaped);
uint64_t escaped = escape_and_terminal_code ^ (backslash | this->next_is_escaped);
uint64_t escape = escape_and_terminal_code & backslash;
this->next_is_escaped = escape >> 63;
return {escaped, escape};
}
private:
static constexpr const uint64_t ODD_BITS = 0xAAAAAAAAAAAAAAAAULL;
simdjson_really_inline uint64_t next_escaped_without_backslashes() noexcept {
uint64_t escaped = this->next_is_escaped;
this->next_is_escaped = 0;
return escaped;
}
/**
* Returns a mask of the next escape characters (masking out escaped backslashes), along with
* any non-backslash escape codes.
*
* \n \\n \\\n \\\\n returns:
* \n \ \ \n \ \
* 11 100 1011 10100
*
* You are expected to mask out the first bit yourself if the previous block had a trailing
* escape.
*
* & the result with potential_escape to get just the escape characters.
* ^ the result with (potential_escape | first_is_escaped) to get escaped characters.
*/
static simdjson_really_inline uint64_t next_escape_and_terminal_code(uint64_t potential_escape) noexcept {
// If we were to just shift and mask out any odd bits, we'd actually get a *half* right answer:
// any even-aligned backslash runs would be correct! Odd-aligned backslash runs would be
// inverted (\\\ would be 010 instead of 101).
//
// ```
// string: | ____\\\\_\\\\_____ |
// maybe_escaped | ODD | \ \ \ \ |
// even-aligned ^^^ ^^^^ odd-aligned
// ```
//
// Taking that into account, our basic strategy is:
//
// 1. Use subtraction to produce a mask with 1's for even-aligned runs and 0's for
// odd-aligned runs.
// 2. XOR all odd bits, which masks out the odd bits in even-aligned runs, and brings IN the
// odd bits in odd-aligned runs.
// 3. & with backslash to clean up any stray bits.
// runs are set to 0, and then XORing with "odd":
//
// | | Mask (shows characters instead of 1's) | Instructions |
// |--------------------------------|----------------------------------------|---------------------|
// | string | `\\n_\\\n___\\\n___\\\\___\\\\__\\\` |
// | | ` even odd even odd odd` |
// | maybe_escaped | ` n \\n \\n \\\_ \\\_ \\` X | 1 (potential_escape << 1)
// | maybe_escaped_and_odd | ` \n_ \\n _ \\\n_ _ \\\__ _\\\_ \\\` | 1 (maybe_escaped | odd)
// | even_series_codes_and_odd | ` n_\\\ _ n_ _\\\\ _ _ ` | 1 (maybe_escaped_and_odd - potential_escape)
// | escape_and_terminal_code | ` \n \ \n \ \n \ \ \ \ \ \` | 1 (^ odd)
//
// Escaped characters are characters following an escape.
uint64_t maybe_escaped = potential_escape << 1;
// To distinguish odd from even escape sequences, therefore, we turn on any *starting*
// escapes that are on an odd byte. (We actually bring in all odd bits, for speed.)
// - Odd runs of backslashes are 0000, and the code at the end ("n" in \n or \\n) is 1.
// - Odd runs of backslashes are 1111, and the code at the end ("n" in \n or \\n) is 0.
// - All other odd bytes are 1, and even bytes are 0.
uint64_t maybe_escaped_and_odd_bits = maybe_escaped | ODD_BITS;
uint64_t even_series_codes_and_odd_bits = maybe_escaped_and_odd_bits - potential_escape;
// Now we flip all odd bytes back with xor. This:
// - Makes odd runs of backslashes go from 0000 to 1010
// - Makes even runs of backslashes go from 1111 to 1010
// - Sets actually-escaped codes to 1 (the n in \n and \\n: \n = 11, \\n = 100)
// - Resets all other bytes to 0
return even_series_codes_and_odd_bits ^ ODD_BITS;
}
};
} // namespace stage1
} // unnamed namespace
} // namespace westmere
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE1_JSON_STRING_SCANNER_H
/* end file generic/stage1/json_escape_scanner.h for westmere */
/* including generic/stage1/json_string_scanner.h for westmere: #include <generic/stage1/json_string_scanner.h> */
/* begin file generic/stage1/json_string_scanner.h for westmere */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_JSON_STRING_SCANNER_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_JSON_STRING_SCANNER_H */
/* amalgamation skipped (editor-only): #include <generic/stage1/base.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/json_escape_scanner.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace westmere {
namespace {
namespace stage1 {
struct json_string_block {
// We spell out the constructors in the hope of resolving inlining issues with Visual Studio 2017
simdjson_really_inline json_string_block(uint64_t escaped, uint64_t quote, uint64_t in_string) :
_escaped(escaped), _quote(quote), _in_string(in_string) {}
// Escaped characters (characters following an escape() character)
simdjson_really_inline uint64_t escaped() const { return _escaped; }
// Real (non-backslashed) quotes
simdjson_really_inline uint64_t quote() const { return _quote; }
// Only characters inside the string (not including the quotes)
simdjson_really_inline uint64_t string_content() const { return _in_string & ~_quote; }
// Return a mask of whether the given characters are inside a string (only works on non-quotes)
simdjson_really_inline uint64_t non_quote_inside_string(uint64_t mask) const { return mask & _in_string; }
// Return a mask of whether the given characters are inside a string (only works on non-quotes)
simdjson_really_inline uint64_t non_quote_outside_string(uint64_t mask) const { return mask & ~_in_string; }
// Tail of string (everything except the start quote)
simdjson_really_inline uint64_t string_tail() const { return _in_string ^ _quote; }
// escaped characters (backslashed--does not include the hex characters after \u)
uint64_t _escaped;
// real quotes (non-escaped ones)
uint64_t _quote;
// string characters (includes start quote but not end quote)
uint64_t _in_string;
};
// Scans blocks for string characters, storing the state necessary to do so
class json_string_scanner {
public:
simdjson_really_inline json_string_block next(const simd::simd8x64<uint8_t>& in);
// Returns either UNCLOSED_STRING or SUCCESS
simdjson_really_inline error_code finish();
private:
// Scans for escape characters
json_escape_scanner escape_scanner{};
// Whether the last iteration was still inside a string (all 1's = true, all 0's = false).
uint64_t prev_in_string = 0ULL;
};
//
// Return a mask of all string characters plus end quotes.
//
// prev_escaped is overflow saying whether the next character is escaped.
// prev_in_string is overflow saying whether we're still in a string.
//
// Backslash sequences outside of quotes will be detected in stage 2.
//
simdjson_really_inline json_string_block json_string_scanner::next(const simd::simd8x64<uint8_t>& in) {
const uint64_t backslash = in.eq('\\');
const uint64_t escaped = escape_scanner.next(backslash).escaped;
const uint64_t quote = in.eq('"') & ~escaped;
//
// prefix_xor flips on bits inside the string (and flips off the end quote).
//
// Then we xor with prev_in_string: if we were in a string already, its effect is flipped
// (characters inside strings are outside, and characters outside strings are inside).
//
const uint64_t in_string = prefix_xor(quote) ^ prev_in_string;
//
// Check if we're still in a string at the end of the box so the next block will know
//
prev_in_string = uint64_t(static_cast<int64_t>(in_string) >> 63);
// Use ^ to turn the beginning quote off, and the end quote on.
// We are returning a function-local object so either we get a move constructor
// or we get copy elision.
return json_string_block(escaped, quote, in_string);
}
simdjson_really_inline error_code json_string_scanner::finish() {
if (prev_in_string) {
return UNCLOSED_STRING;
}
return SUCCESS;
}
} // namespace stage1
} // unnamed namespace
} // namespace westmere
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE1_JSON_STRING_SCANNER_H
/* end file generic/stage1/json_string_scanner.h for westmere */
/* including generic/stage1/utf8_lookup4_algorithm.h for westmere: #include <generic/stage1/utf8_lookup4_algorithm.h> */
/* begin file generic/stage1/utf8_lookup4_algorithm.h for westmere */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_UTF8_LOOKUP4_ALGORITHM_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_UTF8_LOOKUP4_ALGORITHM_H */
/* amalgamation skipped (editor-only): #include <generic/stage1/base.h> */
/* amalgamation skipped (editor-only): #include <generic/dom_parser_implementation.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace westmere {
namespace {
namespace utf8_validation {
using namespace simd;
simdjson_inline simd8<uint8_t> check_special_cases(const simd8<uint8_t> input, const simd8<uint8_t> prev1) {
// Bit 0 = Too Short (lead byte/ASCII followed by lead byte/ASCII)
// Bit 1 = Too Long (ASCII followed by continuation)
// Bit 2 = Overlong 3-byte
// Bit 4 = Surrogate
// Bit 5 = Overlong 2-byte
// Bit 7 = Two Continuations
constexpr const uint8_t TOO_SHORT = 1<<0; // 11______ 0_______
// 11______ 11______
constexpr const uint8_t TOO_LONG = 1<<1; // 0_______ 10______
constexpr const uint8_t OVERLONG_3 = 1<<2; // 11100000 100_____
constexpr const uint8_t SURROGATE = 1<<4; // 11101101 101_____
constexpr const uint8_t OVERLONG_2 = 1<<5; // 1100000_ 10______
constexpr const uint8_t TWO_CONTS = 1<<7; // 10______ 10______
constexpr const uint8_t TOO_LARGE = 1<<3; // 11110100 1001____
// 11110100 101_____
// 11110101 1001____
// 11110101 101_____
// 1111011_ 1001____
// 1111011_ 101_____
// 11111___ 1001____
// 11111___ 101_____
constexpr const uint8_t TOO_LARGE_1000 = 1<<6;
// 11110101 1000____
// 1111011_ 1000____
// 11111___ 1000____
constexpr const uint8_t OVERLONG_4 = 1<<6; // 11110000 1000____
const simd8<uint8_t> byte_1_high = prev1.shr<4>().lookup_16<uint8_t>(
// 0_______ ________ <ASCII in byte 1>
TOO_LONG, TOO_LONG, TOO_LONG, TOO_LONG,
TOO_LONG, TOO_LONG, TOO_LONG, TOO_LONG,
// 10______ ________ <continuation in byte 1>
TWO_CONTS, TWO_CONTS, TWO_CONTS, TWO_CONTS,
// 1100____ ________ <two byte lead in byte 1>
TOO_SHORT | OVERLONG_2,
// 1101____ ________ <two byte lead in byte 1>
TOO_SHORT,
// 1110____ ________ <three byte lead in byte 1>
TOO_SHORT | OVERLONG_3 | SURROGATE,
// 1111____ ________ <four+ byte lead in byte 1>
TOO_SHORT | TOO_LARGE | TOO_LARGE_1000 | OVERLONG_4
);
constexpr const uint8_t CARRY = TOO_SHORT | TOO_LONG | TWO_CONTS; // These all have ____ in byte 1 .
const simd8<uint8_t> byte_1_low = (prev1 & 0x0F).lookup_16<uint8_t>(
// ____0000 ________
CARRY | OVERLONG_3 | OVERLONG_2 | OVERLONG_4,
// ____0001 ________
CARRY | OVERLONG_2,
// ____001_ ________
CARRY,
CARRY,
// ____0100 ________
CARRY | TOO_LARGE,
// ____0101 ________
CARRY | TOO_LARGE | TOO_LARGE_1000,
// ____011_ ________
CARRY | TOO_LARGE | TOO_LARGE_1000,
CARRY | TOO_LARGE | TOO_LARGE_1000,
// ____1___ ________
CARRY | TOO_LARGE | TOO_LARGE_1000,
CARRY | TOO_LARGE | TOO_LARGE_1000,
CARRY | TOO_LARGE | TOO_LARGE_1000,
CARRY | TOO_LARGE | TOO_LARGE_1000,
CARRY | TOO_LARGE | TOO_LARGE_1000,
// ____1101 ________
CARRY | TOO_LARGE | TOO_LARGE_1000 | SURROGATE,
CARRY | TOO_LARGE | TOO_LARGE_1000,
CARRY | TOO_LARGE | TOO_LARGE_1000
);
const simd8<uint8_t> byte_2_high = input.shr<4>().lookup_16<uint8_t>(
// ________ 0_______ <ASCII in byte 2>
TOO_SHORT, TOO_SHORT, TOO_SHORT, TOO_SHORT,
TOO_SHORT, TOO_SHORT, TOO_SHORT, TOO_SHORT,
// ________ 1000____
TOO_LONG | OVERLONG_2 | TWO_CONTS | OVERLONG_3 | TOO_LARGE_1000 | OVERLONG_4,
// ________ 1001____
TOO_LONG | OVERLONG_2 | TWO_CONTS | OVERLONG_3 | TOO_LARGE,
// ________ 101_____
TOO_LONG | OVERLONG_2 | TWO_CONTS | SURROGATE | TOO_LARGE,
TOO_LONG | OVERLONG_2 | TWO_CONTS | SURROGATE | TOO_LARGE,
// ________ 11______
TOO_SHORT, TOO_SHORT, TOO_SHORT, TOO_SHORT
);
return (byte_1_high & byte_1_low & byte_2_high);
}
simdjson_inline simd8<uint8_t> check_multibyte_lengths(const simd8<uint8_t> input,
const simd8<uint8_t> prev_input, const simd8<uint8_t> sc) {
simd8<uint8_t> prev2 = input.prev<2>(prev_input);
simd8<uint8_t> prev3 = input.prev<3>(prev_input);
simd8<uint8_t> must23 = must_be_2_3_continuation(prev2, prev3);
simd8<uint8_t> must23_80 = must23 & uint8_t(0x80);
return must23_80 ^ sc;
}
//
// Return nonzero if there are incomplete multibyte characters at the end of the block:
// e.g. if there is a 4-byte character, but it's 3 bytes from the end.
//
simdjson_inline simd8<uint8_t> is_incomplete(const simd8<uint8_t> input) {
// If the previous input's last 3 bytes match this, they're too short (they ended at EOF):
// ... 1111____ 111_____ 11______
#if SIMDJSON_IMPLEMENTATION_ICELAKE
static const uint8_t max_array[64] = {
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 0xf0u-1, 0xe0u-1, 0xc0u-1
};
#else
static const uint8_t max_array[32] = {
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 0xf0u-1, 0xe0u-1, 0xc0u-1
};
#endif
const simd8<uint8_t> max_value(&max_array[sizeof(max_array)-sizeof(simd8<uint8_t>)]);
return input.gt_bits(max_value);
}
struct utf8_checker {
// If this is nonzero, there has been a UTF-8 error.
simd8<uint8_t> error;
// The last input we received
simd8<uint8_t> prev_input_block;
// Whether the last input we received was incomplete (used for ASCII fast path)
simd8<uint8_t> prev_incomplete;
//
// Check whether the current bytes are valid UTF-8.
//
simdjson_inline void check_utf8_bytes(const simd8<uint8_t> input, const simd8<uint8_t> prev_input) {
// Flip prev1...prev3 so we can easily determine if they are 2+, 3+ or 4+ lead bytes
// (2, 3, 4-byte leads become large positive numbers instead of small negative numbers)
simd8<uint8_t> prev1 = input.prev<1>(prev_input);
simd8<uint8_t> sc = check_special_cases(input, prev1);
this->error |= check_multibyte_lengths(input, prev_input, sc);
}
// The only problem that can happen at EOF is that a multibyte character is too short
// or a byte value too large in the last bytes: check_special_cases only checks for bytes
// too large in the first of two bytes.
simdjson_inline void check_eof() {
// If the previous block had incomplete UTF-8 characters at the end, an ASCII block can't
// possibly finish them.
this->error |= this->prev_incomplete;
}
simdjson_inline void check_next_input(const simd8x64<uint8_t>& input) {
if(simdjson_likely(is_ascii(input))) {
this->error |= this->prev_incomplete;
} else {
// you might think that a for-loop would work, but under Visual Studio, it is not good enough.
static_assert((simd8x64<uint8_t>::NUM_CHUNKS == 1)
||(simd8x64<uint8_t>::NUM_CHUNKS == 2)
|| (simd8x64<uint8_t>::NUM_CHUNKS == 4),
"We support one, two or four chunks per 64-byte block.");
SIMDJSON_IF_CONSTEXPR (simd8x64<uint8_t>::NUM_CHUNKS == 1) {
this->check_utf8_bytes(input.chunks[0], this->prev_input_block);
} else SIMDJSON_IF_CONSTEXPR (simd8x64<uint8_t>::NUM_CHUNKS == 2) {
this->check_utf8_bytes(input.chunks[0], this->prev_input_block);
this->check_utf8_bytes(input.chunks[1], input.chunks[0]);
} else SIMDJSON_IF_CONSTEXPR (simd8x64<uint8_t>::NUM_CHUNKS == 4) {
this->check_utf8_bytes(input.chunks[0], this->prev_input_block);
this->check_utf8_bytes(input.chunks[1], input.chunks[0]);
this->check_utf8_bytes(input.chunks[2], input.chunks[1]);
this->check_utf8_bytes(input.chunks[3], input.chunks[2]);
}
this->prev_incomplete = is_incomplete(input.chunks[simd8x64<uint8_t>::NUM_CHUNKS-1]);
this->prev_input_block = input.chunks[simd8x64<uint8_t>::NUM_CHUNKS-1];
}
}
// do not forget to call check_eof!
simdjson_inline error_code errors() {
return this->error.any_bits_set_anywhere() ? error_code::UTF8_ERROR : error_code::SUCCESS;
}
}; // struct utf8_checker
} // namespace utf8_validation
} // unnamed namespace
} // namespace westmere
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE1_UTF8_LOOKUP4_ALGORITHM_H
/* end file generic/stage1/utf8_lookup4_algorithm.h for westmere */
/* including generic/stage1/json_scanner.h for westmere: #include <generic/stage1/json_scanner.h> */
/* begin file generic/stage1/json_scanner.h for westmere */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_JSON_SCANNER_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_JSON_SCANNER_H */
/* amalgamation skipped (editor-only): #include <generic/stage1/base.h> */
/* amalgamation skipped (editor-only): #include <generic/json_character_block.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/json_string_scanner.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace westmere {
namespace {
namespace stage1 {
/**
* A block of scanned json, with information on operators and scalars.
*
* We seek to identify pseudo-structural characters. Anything that is inside
* a string must be omitted (hence & ~_string.string_tail()).
* Otherwise, pseudo-structural characters come in two forms.
* 1. We have the structural characters ([,],{,},:, comma). The
* term 'structural character' is from the JSON RFC.
* 2. We have the 'scalar pseudo-structural characters'.
* Scalars are quotes, and any character except structural characters and white space.
*
* To identify the scalar pseudo-structural characters, we must look at what comes
* before them: it must be a space, a quote or a structural characters.
* Starting with simdjson v0.3, we identify them by
* negation: we identify everything that is followed by a non-quote scalar,
* and we negate that. Whatever remains must be a 'scalar pseudo-structural character'.
*/
struct json_block {
public:
// We spell out the constructors in the hope of resolving inlining issues with Visual Studio 2017
simdjson_inline json_block(json_string_block&& string, json_character_block characters, uint64_t follows_potential_nonquote_scalar) :
_string(std::move(string)), _characters(characters), _follows_potential_nonquote_scalar(follows_potential_nonquote_scalar) {}
simdjson_inline json_block(json_string_block string, json_character_block characters, uint64_t follows_potential_nonquote_scalar) :
_string(string), _characters(characters), _follows_potential_nonquote_scalar(follows_potential_nonquote_scalar) {}
/**
* The start of structurals.
* In simdjson prior to v0.3, these were called the pseudo-structural characters.
**/
simdjson_inline uint64_t structural_start() const noexcept { return potential_structural_start() & ~_string.string_tail(); }
/** All JSON whitespace (i.e. not in a string) */
simdjson_inline uint64_t whitespace() const noexcept { return non_quote_outside_string(_characters.whitespace()); }
// Helpers
/** Whether the given characters are inside a string (only works on non-quotes) */
simdjson_inline uint64_t non_quote_inside_string(uint64_t mask) const noexcept { return _string.non_quote_inside_string(mask); }
/** Whether the given characters are outside a string (only works on non-quotes) */
simdjson_inline uint64_t non_quote_outside_string(uint64_t mask) const noexcept { return _string.non_quote_outside_string(mask); }
// string and escape characters
json_string_block _string;
// whitespace, structural characters ('operators'), scalars
json_character_block _characters;
// whether the previous character was a scalar
uint64_t _follows_potential_nonquote_scalar;
private:
// Potential structurals (i.e. disregarding strings)
/**
* structural elements ([,],{,},:, comma) plus scalar starts like 123, true and "abc".
* They may reside inside a string.
**/
simdjson_inline uint64_t potential_structural_start() const noexcept { return _characters.op() | potential_scalar_start(); }
/**
* The start of non-operator runs, like 123, true and "abc".
* It main reside inside a string.
**/
simdjson_inline uint64_t potential_scalar_start() const noexcept {
// The term "scalar" refers to anything except structural characters and white space
// (so letters, numbers, quotes).
// Whenever it is preceded by something that is not a structural element ({,},[,],:, ") nor a white-space
// then we know that it is irrelevant structurally.
return _characters.scalar() & ~follows_potential_scalar();
}
/**
* Whether the given character is immediately after a non-operator like 123, true.
* The characters following a quote are not included.
*/
simdjson_inline uint64_t follows_potential_scalar() const noexcept {
// _follows_potential_nonquote_scalar: is defined as marking any character that follows a character
// that is not a structural element ({,},[,],:, comma) nor a quote (") and that is not a
// white space.
// It is understood that within quoted region, anything at all could be marked (irrelevant).
return _follows_potential_nonquote_scalar;
}
};
/**
* Scans JSON for important bits: structural characters or 'operators', strings, and scalars.
*
* The scanner starts by calculating two distinct things:
* - string characters (taking \" into account)
* - structural characters or 'operators' ([]{},:, comma)
* and scalars (runs of non-operators like 123, true and "abc")
*
* To minimize data dependency (a key component of the scanner's speed), it finds these in parallel:
* in particular, the operator/scalar bit will find plenty of things that are actually part of
* strings. When we're done, json_block will fuse the two together by masking out tokens that are
* part of a string.
*/
class json_scanner {
public:
json_scanner() = default;
simdjson_inline json_block next(const simd::simd8x64<uint8_t>& in);
// Returns either UNCLOSED_STRING or SUCCESS
simdjson_inline error_code finish();
private:
// Whether the last character of the previous iteration is part of a scalar token
// (anything except whitespace or a structural character/'operator').
uint64_t prev_scalar = 0ULL;
json_string_scanner string_scanner{};
};
//
// Check if the current character immediately follows a matching character.
//
// For example, this checks for quotes with backslashes in front of them:
//
// const uint64_t backslashed_quote = in.eq('"') & immediately_follows(in.eq('\'), prev_backslash);
//
simdjson_inline uint64_t follows(const uint64_t match, uint64_t &overflow) {
const uint64_t result = match << 1 | overflow;
overflow = match >> 63;
return result;
}
simdjson_inline json_block json_scanner::next(const simd::simd8x64<uint8_t>& in) {
json_string_block strings = string_scanner.next(in);
// identifies the white-space and the structural characters
json_character_block characters = json_character_block::classify(in);
// The term "scalar" refers to anything except structural characters and white space
// (so letters, numbers, quotes).
// We want follows_scalar to mark anything that follows a non-quote scalar (so letters and numbers).
//
// A terminal quote should either be followed by a structural character (comma, brace, bracket, colon)
// or nothing. However, we still want ' "a string"true ' to mark the 't' of 'true' as a potential
// pseudo-structural character just like we would if we had ' "a string" true '; otherwise we
// may need to add an extra check when parsing strings.
//
// Performance: there are many ways to skin this cat.
const uint64_t nonquote_scalar = characters.scalar() & ~strings.quote();
uint64_t follows_nonquote_scalar = follows(nonquote_scalar, prev_scalar);
// We are returning a function-local object so either we get a move constructor
// or we get copy elision.
return json_block(
strings,// strings is a function-local object so either it moves or the copy is elided.
characters,
follows_nonquote_scalar
);
}
simdjson_inline error_code json_scanner::finish() {
return string_scanner.finish();
}
} // namespace stage1
} // unnamed namespace
} // namespace westmere
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE1_JSON_SCANNER_H
/* end file generic/stage1/json_scanner.h for westmere */
// All other declarations
/* including generic/stage1/find_next_document_index.h for westmere: #include <generic/stage1/find_next_document_index.h> */
/* begin file generic/stage1/find_next_document_index.h for westmere */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_FIND_NEXT_DOCUMENT_INDEX_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_FIND_NEXT_DOCUMENT_INDEX_H */
/* amalgamation skipped (editor-only): #include <generic/stage1/base.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/dom_parser_implementation.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace westmere {
namespace {
namespace stage1 {
/**
* This algorithm is used to quickly identify the last structural position that
* makes up a complete document.
*
* It does this by going backwards and finding the last *document boundary* (a
* place where one value follows another without a comma between them). If the
* last document (the characters after the boundary) has an equal number of
* start and end brackets, it is considered complete.
*
* Simply put, we iterate over the structural characters, starting from
* the end. We consider that we found the end of a JSON document when the
* first element of the pair is NOT one of these characters: '{' '[' ':' ','
* and when the second element is NOT one of these characters: '}' ']' ':' ','.
*
* This simple comparison works most of the time, but it does not cover cases
* where the batch's structural indexes contain a perfect amount of documents.
* In such a case, we do not have access to the structural index which follows
* the last document, therefore, we do not have access to the second element in
* the pair, and that means we cannot identify the last document. To fix this
* issue, we keep a count of the open and closed curly/square braces we found
* while searching for the pair. When we find a pair AND the count of open and
* closed curly/square braces is the same, we know that we just passed a
* complete document, therefore the last json buffer location is the end of the
* batch.
*/
simdjson_inline uint32_t find_next_document_index(dom_parser_implementation &parser) {
// Variant: do not count separately, just figure out depth
if(parser.n_structural_indexes == 0) { return 0; }
auto arr_cnt = 0;
auto obj_cnt = 0;
for (auto i = parser.n_structural_indexes - 1; i > 0; i--) {
auto idxb = parser.structural_indexes[i];
switch (parser.buf[idxb]) {
case ':':
case ',':
continue;
case '}':
obj_cnt--;
continue;
case ']':
arr_cnt--;
continue;
case '{':
obj_cnt++;
break;
case '[':
arr_cnt++;
break;
}
auto idxa = parser.structural_indexes[i - 1];
switch (parser.buf[idxa]) {
case '{':
case '[':
case ':':
case ',':
continue;
}
// Last document is complete, so the next document will appear after!
if (!arr_cnt && !obj_cnt) {
return parser.n_structural_indexes;
}
// Last document is incomplete; mark the document at i + 1 as the next one
return i;
}
// If we made it to the end, we want to finish counting to see if we have a full document.
switch (parser.buf[parser.structural_indexes[0]]) {
case '}':
obj_cnt--;
break;
case ']':
arr_cnt--;
break;
case '{':
obj_cnt++;
break;
case '[':
arr_cnt++;
break;
}
if (!arr_cnt && !obj_cnt) {
// We have a complete document.
return parser.n_structural_indexes;
}
return 0;
}
} // namespace stage1
} // unnamed namespace
} // namespace westmere
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE1_FIND_NEXT_DOCUMENT_INDEX_H
/* end file generic/stage1/find_next_document_index.h for westmere */
/* including generic/stage1/json_minifier.h for westmere: #include <generic/stage1/json_minifier.h> */
/* begin file generic/stage1/json_minifier.h for westmere */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_JSON_MINIFIER_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_JSON_MINIFIER_H */
/* amalgamation skipped (editor-only): #include <generic/stage1/base.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/json_scanner.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/buf_block_reader.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
// This file contains the common code every implementation uses in stage1
// It is intended to be included multiple times and compiled multiple times
// We assume the file in which it is included already includes
// "simdjson/stage1.h" (this simplifies amalgation)
namespace simdjson {
namespace westmere {
namespace {
namespace stage1 {
class json_minifier {
public:
template<size_t STEP_SIZE>
static error_code minify(const uint8_t *buf, size_t len, uint8_t *dst, size_t &dst_len) noexcept;
private:
simdjson_inline json_minifier(uint8_t *_dst)
: dst{_dst}
{}
template<size_t STEP_SIZE>
simdjson_inline void step(const uint8_t *block_buf, buf_block_reader<STEP_SIZE> &reader) noexcept;
simdjson_inline void next(const simd::simd8x64<uint8_t>& in, const json_block& block);
simdjson_inline error_code finish(uint8_t *dst_start, size_t &dst_len);
json_scanner scanner{};
uint8_t *dst;
};
simdjson_inline void json_minifier::next(const simd::simd8x64<uint8_t>& in, const json_block& block) {
uint64_t mask = block.whitespace();
dst += in.compress(mask, dst);
}
simdjson_inline error_code json_minifier::finish(uint8_t *dst_start, size_t &dst_len) {
error_code error = scanner.finish();
if (error) { dst_len = 0; return error; }
dst_len = dst - dst_start;
return SUCCESS;
}
template<>
simdjson_inline void json_minifier::step<128>(const uint8_t *block_buf, buf_block_reader<128> &reader) noexcept {
simd::simd8x64<uint8_t> in_1(block_buf);
simd::simd8x64<uint8_t> in_2(block_buf+64);
json_block block_1 = scanner.next(in_1);
json_block block_2 = scanner.next(in_2);
this->next(in_1, block_1);
this->next(in_2, block_2);
reader.advance();
}
template<>
simdjson_inline void json_minifier::step<64>(const uint8_t *block_buf, buf_block_reader<64> &reader) noexcept {
simd::simd8x64<uint8_t> in_1(block_buf);
json_block block_1 = scanner.next(in_1);
this->next(block_buf, block_1);
reader.advance();
}
template<size_t STEP_SIZE>
error_code json_minifier::minify(const uint8_t *buf, size_t len, uint8_t *dst, size_t &dst_len) noexcept {
buf_block_reader<STEP_SIZE> reader(buf, len);
json_minifier minifier(dst);
// Index the first n-1 blocks
while (reader.has_full_block()) {
minifier.step<STEP_SIZE>(reader.full_block(), reader);
}
// Index the last (remainder) block, padded with spaces
uint8_t block[STEP_SIZE];
size_t remaining_bytes = reader.get_remainder(block);
if (remaining_bytes > 0) {
// We do not want to write directly to the output stream. Rather, we write
// to a local buffer (for safety).
uint8_t out_block[STEP_SIZE];
uint8_t * const guarded_dst{minifier.dst};
minifier.dst = out_block;
minifier.step<STEP_SIZE>(block, reader);
size_t to_write = minifier.dst - out_block;
// In some cases, we could be enticed to consider the padded spaces
// as part of the string. This is fine as long as we do not write more
// than we consumed.
if(to_write > remaining_bytes) { to_write = remaining_bytes; }
memcpy(guarded_dst, out_block, to_write);
minifier.dst = guarded_dst + to_write;
}
return minifier.finish(dst, dst_len);
}
} // namespace stage1
} // unnamed namespace
} // namespace westmere
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE1_JSON_MINIFIER_H
/* end file generic/stage1/json_minifier.h for westmere */
/* including generic/stage1/json_structural_indexer.h for westmere: #include <generic/stage1/json_structural_indexer.h> */
/* begin file generic/stage1/json_structural_indexer.h for westmere */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_JSON_STRUCTURAL_INDEXER_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_JSON_STRUCTURAL_INDEXER_H */
/* amalgamation skipped (editor-only): #include <generic/stage1/base.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/utf8_lookup4_algorithm.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/buf_block_reader.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/json_string_scanner.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/json_scanner.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/json_minifier.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/find_next_document_index.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
// This file contains the common code every implementation uses in stage1
// It is intended to be included multiple times and compiled multiple times
// We assume the file in which it is included already includes
// "simdjson/stage1.h" (this simplifies amalgation)
namespace simdjson {
namespace westmere {
namespace {
namespace stage1 {
class bit_indexer {
public:
uint32_t *tail;
simdjson_inline bit_indexer(uint32_t *index_buf) : tail(index_buf) {}
#if SIMDJSON_PREFER_REVERSE_BITS
/**
* ARM lacks a fast trailing zero instruction, but it has a fast
* bit reversal instruction and a fast leading zero instruction.
* Thus it may be profitable to reverse the bits (once) and then
* to rely on a sequence of instructions that call the leading
* zero instruction.
*
* Performance notes:
* The chosen routine is not optimal in terms of data dependency
* since zero_leading_bit might require two instructions. However,
* it tends to minimize the total number of instructions which is
* beneficial.
*/
simdjson_inline void write_index(uint32_t idx, uint64_t& rev_bits, int i) {
int lz = leading_zeroes(rev_bits);
this->tail[i] = static_cast<uint32_t>(idx) + lz;
rev_bits = zero_leading_bit(rev_bits, lz);
}
#else
/**
* Under recent x64 systems, we often have both a fast trailing zero
* instruction and a fast 'clear-lower-bit' instruction so the following
* algorithm can be competitive.
*/
simdjson_inline void write_index(uint32_t idx, uint64_t& bits, int i) {
this->tail[i] = idx + trailing_zeroes(bits);
bits = clear_lowest_bit(bits);
}
#endif // SIMDJSON_PREFER_REVERSE_BITS
template <int START, int N>
simdjson_inline int write_indexes(uint32_t idx, uint64_t& bits) {
write_index(idx, bits, START);
SIMDJSON_IF_CONSTEXPR (N > 1) {
write_indexes<(N-1>0?START+1:START), (N-1>=0?N-1:1)>(idx, bits);
}
return START+N;
}
template <int START, int END, int STEP>
simdjson_inline int write_indexes_stepped(uint32_t idx, uint64_t& bits, int cnt) {
write_indexes<START, STEP>(idx, bits);
SIMDJSON_IF_CONSTEXPR ((START+STEP) < END) {
if (simdjson_unlikely((START+STEP) < cnt)) {
write_indexes_stepped<(START+STEP<END?START+STEP:END), END, STEP>(idx, bits, cnt);
}
}
return ((END-START) % STEP) == 0 ? END : (END-START) - ((END-START) % STEP) + STEP;
}
// flatten out values in 'bits' assuming that they are are to have values of idx
// plus their position in the bitvector, and store these indexes at
// base_ptr[base] incrementing base as we go
// will potentially store extra values beyond end of valid bits, so base_ptr
// needs to be large enough to handle this
//
// If the kernel sets SIMDJSON_GENERIC_JSON_STRUCTURAL_INDEXER_CUSTOM_BIT_INDEXER, then it
// will provide its own version of the code.
#ifdef SIMDJSON_GENERIC_JSON_STRUCTURAL_INDEXER_CUSTOM_BIT_INDEXER
simdjson_inline void write(uint32_t idx, uint64_t bits);
#else
simdjson_inline void write(uint32_t idx, uint64_t bits) {
// In some instances, the next branch is expensive because it is mispredicted.
// Unfortunately, in other cases,
// it helps tremendously.
if (bits == 0)
return;
int cnt = static_cast<int>(count_ones(bits));
#if SIMDJSON_PREFER_REVERSE_BITS
bits = reverse_bits(bits);
#endif
#ifdef SIMDJSON_STRUCTURAL_INDEXER_STEP
static constexpr const int STEP = SIMDJSON_STRUCTURAL_INDEXER_STEP;
#else
static constexpr const int STEP = 4;
#endif
static constexpr const int STEP_UNTIL = 24;
write_indexes_stepped<0, STEP_UNTIL, STEP>(idx, bits, cnt);
SIMDJSON_IF_CONSTEXPR (STEP_UNTIL < 64) {
if (simdjson_unlikely(STEP_UNTIL < cnt)) {
for (int i=STEP_UNTIL; i<cnt; i++) {
write_index(idx, bits, i);
}
}
}
this->tail += cnt;
}
#endif // SIMDJSON_GENERIC_JSON_STRUCTURAL_INDEXER_CUSTOM_BIT_INDEXER
};
class json_structural_indexer {
public:
/**
* Find the important bits of JSON in a 128-byte chunk, and add them to structural_indexes.
*
* @param partial Setting the partial parameter to true allows the find_structural_bits to
* tolerate unclosed strings. The caller should still ensure that the input is valid UTF-8. If
* you are processing substrings, you may want to call on a function like trimmed_length_safe_utf8.
*/
template<size_t STEP_SIZE>
static error_code index(const uint8_t *buf, size_t len, dom_parser_implementation &parser, stage1_mode partial) noexcept;
private:
simdjson_inline json_structural_indexer(uint32_t *structural_indexes);
template<size_t STEP_SIZE>
simdjson_inline void step(const uint8_t *block, buf_block_reader<STEP_SIZE> &reader) noexcept;
simdjson_inline void next(const simd::simd8x64<uint8_t>& in, const json_block& block, size_t idx);
simdjson_inline error_code finish(dom_parser_implementation &parser, size_t idx, size_t len, stage1_mode partial);
json_scanner scanner{};
utf8_checker checker{};
bit_indexer indexer;
uint64_t prev_structurals = 0;
uint64_t unescaped_chars_error = 0;
};
simdjson_inline json_structural_indexer::json_structural_indexer(uint32_t *structural_indexes) : indexer{structural_indexes} {}
// Skip the last character if it is partial
simdjson_inline size_t trim_partial_utf8(const uint8_t *buf, size_t len) {
if (simdjson_unlikely(len < 3)) {
switch (len) {
case 2:
if (buf[len-1] >= 0xc0) { return len-1; } // 2-, 3- and 4-byte characters with only 1 byte left
if (buf[len-2] >= 0xe0) { return len-2; } // 3- and 4-byte characters with only 2 bytes left
return len;
case 1:
if (buf[len-1] >= 0xc0) { return len-1; } // 2-, 3- and 4-byte characters with only 1 byte left
return len;
case 0:
return len;
}
}
if (buf[len-1] >= 0xc0) { return len-1; } // 2-, 3- and 4-byte characters with only 1 byte left
if (buf[len-2] >= 0xe0) { return len-2; } // 3- and 4-byte characters with only 1 byte left
if (buf[len-3] >= 0xf0) { return len-3; } // 4-byte characters with only 3 bytes left
return len;
}
//
// PERF NOTES:
// We pipe 2 inputs through these stages:
// 1. Load JSON into registers. This takes a long time and is highly parallelizable, so we load
// 2 inputs' worth at once so that by the time step 2 is looking for them input, it's available.
// 2. Scan the JSON for critical data: strings, scalars and operators. This is the critical path.
// The output of step 1 depends entirely on this information. These functions don't quite use
// up enough CPU: the second half of the functions is highly serial, only using 1 execution core
// at a time. The second input's scans has some dependency on the first ones finishing it, but
// they can make a lot of progress before they need that information.
// 3. Step 1 does not use enough capacity, so we run some extra stuff while we're waiting for that
// to finish: utf-8 checks and generating the output from the last iteration.
//
// The reason we run 2 inputs at a time, is steps 2 and 3 are *still* not enough to soak up all
// available capacity with just one input. Running 2 at a time seems to give the CPU a good enough
// workout.
//
template<size_t STEP_SIZE>
error_code json_structural_indexer::index(const uint8_t *buf, size_t len, dom_parser_implementation &parser, stage1_mode partial) noexcept {
if (simdjson_unlikely(len > parser.capacity())) { return CAPACITY; }
// We guard the rest of the code so that we can assume that len > 0 throughout.
if (len == 0) { return EMPTY; }
if (is_streaming(partial)) {
len = trim_partial_utf8(buf, len);
// If you end up with an empty window after trimming
// the partial UTF-8 bytes, then chances are good that you
// have an UTF-8 formatting error.
if(len == 0) { return UTF8_ERROR; }
}
buf_block_reader<STEP_SIZE> reader(buf, len);
json_structural_indexer indexer(parser.structural_indexes.get());
// Read all but the last block
while (reader.has_full_block()) {
indexer.step<STEP_SIZE>(reader.full_block(), reader);
}
// Take care of the last block (will always be there unless file is empty which is
// not supposed to happen.)
uint8_t block[STEP_SIZE];
if (simdjson_unlikely(reader.get_remainder(block) == 0)) { return UNEXPECTED_ERROR; }
indexer.step<STEP_SIZE>(block, reader);
return indexer.finish(parser, reader.block_index(), len, partial);
}
template<>
simdjson_inline void json_structural_indexer::step<128>(const uint8_t *block, buf_block_reader<128> &reader) noexcept {
simd::simd8x64<uint8_t> in_1(block);
simd::simd8x64<uint8_t> in_2(block+64);
json_block block_1 = scanner.next(in_1);
json_block block_2 = scanner.next(in_2);
this->next(in_1, block_1, reader.block_index());
this->next(in_2, block_2, reader.block_index()+64);
reader.advance();
}
template<>
simdjson_inline void json_structural_indexer::step<64>(const uint8_t *block, buf_block_reader<64> &reader) noexcept {
simd::simd8x64<uint8_t> in_1(block);
json_block block_1 = scanner.next(in_1);
this->next(in_1, block_1, reader.block_index());
reader.advance();
}
simdjson_inline void json_structural_indexer::next(const simd::simd8x64<uint8_t>& in, const json_block& block, size_t idx) {
uint64_t unescaped = in.lteq(0x1F);
#if SIMDJSON_UTF8VALIDATION
checker.check_next_input(in);
#endif
indexer.write(uint32_t(idx-64), prev_structurals); // Output *last* iteration's structurals to the parser
prev_structurals = block.structural_start();
unescaped_chars_error |= block.non_quote_inside_string(unescaped);
}
simdjson_inline error_code json_structural_indexer::finish(dom_parser_implementation &parser, size_t idx, size_t len, stage1_mode partial) {
// Write out the final iteration's structurals
indexer.write(uint32_t(idx-64), prev_structurals);
error_code error = scanner.finish();
// We deliberately break down the next expression so that it is
// human readable.
const bool should_we_exit = is_streaming(partial) ?
((error != SUCCESS) && (error != UNCLOSED_STRING)) // when partial we tolerate UNCLOSED_STRING
: (error != SUCCESS); // if partial is false, we must have SUCCESS
const bool have_unclosed_string = (error == UNCLOSED_STRING);
if (simdjson_unlikely(should_we_exit)) { return error; }
if (unescaped_chars_error) {
return UNESCAPED_CHARS;
}
parser.n_structural_indexes = uint32_t(indexer.tail - parser.structural_indexes.get());
/***
* The On Demand API requires special padding.
*
* This is related to https://github.com/simdjson/simdjson/issues/906
* Basically, we want to make sure that if the parsing continues beyond the last (valid)
* structural character, it quickly stops.
* Only three structural characters can be repeated without triggering an error in JSON: [,] and }.
* We repeat the padding character (at 'len'). We don't know what it is, but if the parsing
* continues, then it must be [,] or }.
* Suppose it is ] or }. We backtrack to the first character, what could it be that would
* not trigger an error? It could be ] or } but no, because you can't start a document that way.
* It can't be a comma, a colon or any simple value. So the only way we could continue is
* if the repeated character is [. But if so, the document must start with [. But if the document
* starts with [, it should end with ]. If we enforce that rule, then we would get
* ][[ which is invalid.
*
* This is illustrated with the test array_iterate_unclosed_error() on the following input:
* R"({ "a": [,,)"
**/
parser.structural_indexes[parser.n_structural_indexes] = uint32_t(len); // used later in partial == stage1_mode::streaming_final
parser.structural_indexes[parser.n_structural_indexes + 1] = uint32_t(len);
parser.structural_indexes[parser.n_structural_indexes + 2] = 0;
parser.next_structural_index = 0;
// a valid JSON file cannot have zero structural indexes - we should have found something
if (simdjson_unlikely(parser.n_structural_indexes == 0u)) {
return EMPTY;
}
if (simdjson_unlikely(parser.structural_indexes[parser.n_structural_indexes - 1] > len)) {
return UNEXPECTED_ERROR;
}
if (partial == stage1_mode::streaming_partial) {
// If we have an unclosed string, then the last structural
// will be the quote and we want to make sure to omit it.
if(have_unclosed_string) {
parser.n_structural_indexes--;
// a valid JSON file cannot have zero structural indexes - we should have found something
if (simdjson_unlikely(parser.n_structural_indexes == 0u)) { return CAPACITY; }
}
// We truncate the input to the end of the last complete document (or zero).
auto new_structural_indexes = find_next_document_index(parser);
if (new_structural_indexes == 0 && parser.n_structural_indexes > 0) {
if(parser.structural_indexes[0] == 0) {
// If the buffer is partial and we started at index 0 but the document is
// incomplete, it's too big to parse.
return CAPACITY;
} else {
// It is possible that the document could be parsed, we just had a lot
// of white space.
parser.n_structural_indexes = 0;
return EMPTY;
}
}
parser.n_structural_indexes = new_structural_indexes;
} else if (partial == stage1_mode::streaming_final) {
if(have_unclosed_string) { parser.n_structural_indexes--; }
// We truncate the input to the end of the last complete document (or zero).
// Because partial == stage1_mode::streaming_final, it means that we may
// silently ignore trailing garbage. Though it sounds bad, we do it
// deliberately because many people who have streams of JSON documents
// will truncate them for processing. E.g., imagine that you are uncompressing
// the data from a size file or receiving it in chunks from the network. You
// may not know where exactly the last document will be. Meanwhile the
// document_stream instances allow people to know the JSON documents they are
// parsing (see the iterator.source() method).
parser.n_structural_indexes = find_next_document_index(parser);
// We store the initial n_structural_indexes so that the client can see
// whether we used truncation. If initial_n_structural_indexes == parser.n_structural_indexes,
// then this will query parser.structural_indexes[parser.n_structural_indexes] which is len,
// otherwise, it will copy some prior index.
parser.structural_indexes[parser.n_structural_indexes + 1] = parser.structural_indexes[parser.n_structural_indexes];
// This next line is critical, do not change it unless you understand what you are
// doing.
parser.structural_indexes[parser.n_structural_indexes] = uint32_t(len);
if (simdjson_unlikely(parser.n_structural_indexes == 0u)) {
// We tolerate an unclosed string at the very end of the stream. Indeed, users
// often load their data in bulk without being careful and they want us to ignore
// the trailing garbage.
return EMPTY;
}
}
checker.check_eof();
return checker.errors();
}
} // namespace stage1
} // unnamed namespace
} // namespace westmere
} // namespace simdjson
// Clear CUSTOM_BIT_INDEXER so other implementations can set it if they need to.
#undef SIMDJSON_GENERIC_JSON_STRUCTURAL_INDEXER_CUSTOM_BIT_INDEXER
#endif // SIMDJSON_SRC_GENERIC_STAGE1_JSON_STRUCTURAL_INDEXER_H
/* end file generic/stage1/json_structural_indexer.h for westmere */
/* including generic/stage1/utf8_validator.h for westmere: #include <generic/stage1/utf8_validator.h> */
/* begin file generic/stage1/utf8_validator.h for westmere */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_UTF8_VALIDATOR_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_UTF8_VALIDATOR_H */
/* amalgamation skipped (editor-only): #include <generic/stage1/base.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/buf_block_reader.h> */
/* amalgamation skipped (editor-only): #include <generic/stage1/utf8_lookup4_algorithm.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace westmere {
namespace {
namespace stage1 {
/**
* Validates that the string is actual UTF-8.
*/
template<class checker>
bool generic_validate_utf8(const uint8_t * input, size_t length) {
checker c{};
buf_block_reader<64> reader(input, length);
while (reader.has_full_block()) {
simd::simd8x64<uint8_t> in(reader.full_block());
c.check_next_input(in);
reader.advance();
}
uint8_t block[64]{};
reader.get_remainder(block);
simd::simd8x64<uint8_t> in(block);
c.check_next_input(in);
reader.advance();
c.check_eof();
return c.errors() == error_code::SUCCESS;
}
bool generic_validate_utf8(const char * input, size_t length) {
return generic_validate_utf8<utf8_checker>(reinterpret_cast<const uint8_t *>(input),length);
}
} // namespace stage1
} // unnamed namespace
} // namespace westmere
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE1_UTF8_VALIDATOR_H
/* end file generic/stage1/utf8_validator.h for westmere */
/* end file generic/stage1/amalgamated.h for westmere */
/* including generic/stage2/amalgamated.h for westmere: #include <generic/stage2/amalgamated.h> */
/* begin file generic/stage2/amalgamated.h for westmere */
// Stuff other things depend on
/* including generic/stage2/base.h for westmere: #include <generic/stage2/base.h> */
/* begin file generic/stage2/base.h for westmere */
#ifndef SIMDJSON_SRC_GENERIC_STAGE2_BASE_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE2_BASE_H */
/* amalgamation skipped (editor-only): #include <generic/base.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace westmere {
namespace {
namespace stage2 {
class json_iterator;
class structural_iterator;
struct tape_builder;
struct tape_writer;
} // namespace stage2
} // unnamed namespace
} // namespace westmere
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE2_BASE_H
/* end file generic/stage2/base.h for westmere */
/* including generic/stage2/tape_writer.h for westmere: #include <generic/stage2/tape_writer.h> */
/* begin file generic/stage2/tape_writer.h for westmere */
#ifndef SIMDJSON_SRC_GENERIC_STAGE2_TAPE_WRITER_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE2_TAPE_WRITER_H */
/* amalgamation skipped (editor-only): #include <generic/stage2/base.h> */
/* amalgamation skipped (editor-only): #include <simdjson/internal/tape_type.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#include <cstring>
namespace simdjson {
namespace westmere {
namespace {
namespace stage2 {
struct tape_writer {
/** The next place to write to tape */
uint64_t *next_tape_loc;
/** Write a signed 64-bit value to tape. */
simdjson_inline void append_s64(int64_t value) noexcept;
/** Write an unsigned 64-bit value to tape. */
simdjson_inline void append_u64(uint64_t value) noexcept;
/** Write a double value to tape. */
simdjson_inline void append_double(double value) noexcept;
/**
* Append a tape entry (an 8-bit type,and 56 bits worth of value).
*/
simdjson_inline void append(uint64_t val, internal::tape_type t) noexcept;
/**
* Skip the current tape entry without writing.
*
* Used to skip the start of the container, since we'll come back later to fill it in when the
* container ends.
*/
simdjson_inline void skip() noexcept;
/**
* Skip the number of tape entries necessary to write a large u64 or i64.
*/
simdjson_inline void skip_large_integer() noexcept;
/**
* Skip the number of tape entries necessary to write a double.
*/
simdjson_inline void skip_double() noexcept;
/**
* Write a value to a known location on tape.
*
* Used to go back and write out the start of a container after the container ends.
*/
simdjson_inline static void write(uint64_t &tape_loc, uint64_t val, internal::tape_type t) noexcept;
private:
/**
* Append both the tape entry, and a supplementary value following it. Used for types that need
* all 64 bits, such as double and uint64_t.
*/
template<typename T>
simdjson_inline void append2(uint64_t val, T val2, internal::tape_type t) noexcept;
}; // struct tape_writer
simdjson_inline void tape_writer::append_s64(int64_t value) noexcept {
append2(0, value, internal::tape_type::INT64);
}
simdjson_inline void tape_writer::append_u64(uint64_t value) noexcept {
append(0, internal::tape_type::UINT64);
*next_tape_loc = value;
next_tape_loc++;
}
/** Write a double value to tape. */
simdjson_inline void tape_writer::append_double(double value) noexcept {
append2(0, value, internal::tape_type::DOUBLE);
}
simdjson_inline void tape_writer::skip() noexcept {
next_tape_loc++;
}
simdjson_inline void tape_writer::skip_large_integer() noexcept {
next_tape_loc += 2;
}
simdjson_inline void tape_writer::skip_double() noexcept {
next_tape_loc += 2;
}
simdjson_inline void tape_writer::append(uint64_t val, internal::tape_type t) noexcept {
*next_tape_loc = val | ((uint64_t(char(t))) << 56);
next_tape_loc++;
}
template<typename T>
simdjson_inline void tape_writer::append2(uint64_t val, T val2, internal::tape_type t) noexcept {
append(val, t);
static_assert(sizeof(val2) == sizeof(*next_tape_loc), "Type is not 64 bits!");
memcpy(next_tape_loc, &val2, sizeof(val2));
next_tape_loc++;
}
simdjson_inline void tape_writer::write(uint64_t &tape_loc, uint64_t val, internal::tape_type t) noexcept {
tape_loc = val | ((uint64_t(char(t))) << 56);
}
} // namespace stage2
} // unnamed namespace
} // namespace westmere
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE2_TAPE_WRITER_H
/* end file generic/stage2/tape_writer.h for westmere */
/* including generic/stage2/logger.h for westmere: #include <generic/stage2/logger.h> */
/* begin file generic/stage2/logger.h for westmere */
#ifndef SIMDJSON_SRC_GENERIC_STAGE2_LOGGER_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE2_LOGGER_H */
/* amalgamation skipped (editor-only): #include <generic/stage2/base.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#include <cstring>
// This is for an internal-only stage 2 specific logger.
// Set LOG_ENABLED = true to log what stage 2 is doing!
namespace simdjson {
namespace westmere {
namespace {
namespace logger {
static constexpr const char * DASHES = "----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------";
#if SIMDJSON_VERBOSE_LOGGING
static constexpr const bool LOG_ENABLED = true;
#else
static constexpr const bool LOG_ENABLED = false;
#endif
static constexpr const int LOG_EVENT_LEN = 20;
static constexpr const int LOG_BUFFER_LEN = 30;
static constexpr const int LOG_SMALL_BUFFER_LEN = 10;
static constexpr const int LOG_INDEX_LEN = 5;
static int log_depth; // Not threadsafe. Log only.
// Helper to turn unprintable or newline characters into spaces
static simdjson_inline char printable_char(char c) {
if (c >= 0x20) {
return c;
} else {
return ' ';
}
}
// Print the header and set up log_start
static simdjson_inline void log_start() {
if (LOG_ENABLED) {
log_depth = 0;
printf("\n");
printf("| %-*s | %-*s | %-*s | %-*s | Detail |\n", LOG_EVENT_LEN, "Event", LOG_BUFFER_LEN, "Buffer", LOG_SMALL_BUFFER_LEN, "Next", 5, "Next#");
printf("|%.*s|%.*s|%.*s|%.*s|--------|\n", LOG_EVENT_LEN+2, DASHES, LOG_BUFFER_LEN+2, DASHES, LOG_SMALL_BUFFER_LEN+2, DASHES, 5+2, DASHES);
}
}
simdjson_unused static simdjson_inline void log_string(const char *message) {
if (LOG_ENABLED) {
printf("%s\n", message);
}
}
// Logs a single line from the stage 2 DOM parser
template<typename S>
static simdjson_inline void log_line(S &structurals, const char *title_prefix, const char *title, const char *detail) {
if (LOG_ENABLED) {
printf("| %*s%s%-*s ", log_depth*2, "", title_prefix, LOG_EVENT_LEN - log_depth*2 - int(strlen(title_prefix)), title);
auto current_index = structurals.at_beginning() ? nullptr : structurals.next_structural-1;
auto next_index = structurals.next_structural;
auto current = current_index ? &structurals.buf[*current_index] : reinterpret_cast<const uint8_t*>(" ");
auto next = &structurals.buf[*next_index];
{
// Print the next N characters in the buffer.
printf("| ");
// Otherwise, print the characters starting from the buffer position.
// Print spaces for unprintable or newline characters.
for (int i=0;i<LOG_BUFFER_LEN;i++) {
printf("%c", printable_char(current[i]));
}
printf(" ");
// Print the next N characters in the buffer.
printf("| ");
// Otherwise, print the characters starting from the buffer position.
// Print spaces for unprintable or newline characters.
for (int i=0;i<LOG_SMALL_BUFFER_LEN;i++) {
printf("%c", printable_char(next[i]));
}
printf(" ");
}
if (current_index) {
printf("| %*u ", LOG_INDEX_LEN, *current_index);
} else {
printf("| %-*s ", LOG_INDEX_LEN, "");
}
// printf("| %*u ", LOG_INDEX_LEN, structurals.next_tape_index());
printf("| %-s ", detail);
printf("|\n");
}
}
} // namespace logger
} // unnamed namespace
} // namespace westmere
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE2_LOGGER_H
/* end file generic/stage2/logger.h for westmere */
// All other declarations
/* including generic/stage2/json_iterator.h for westmere: #include <generic/stage2/json_iterator.h> */
/* begin file generic/stage2/json_iterator.h for westmere */
#ifndef SIMDJSON_SRC_GENERIC_STAGE2_JSON_ITERATOR_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE2_JSON_ITERATOR_H */
/* amalgamation skipped (editor-only): #include <generic/stage2/base.h> */
/* amalgamation skipped (editor-only): #include <generic/stage2/logger.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/dom_parser_implementation.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace westmere {
namespace {
namespace stage2 {
class json_iterator {
public:
const uint8_t* const buf;
uint32_t *next_structural;
dom_parser_implementation &dom_parser;
uint32_t depth{0};
/**
* Walk the JSON document.
*
* The visitor receives callbacks when values are encountered. All callbacks pass the iterator as
* the first parameter; some callbacks have other parameters as well:
*
* - visit_document_start() - at the beginning.
* - visit_document_end() - at the end (if things were successful).
*
* - visit_array_start() - at the start `[` of a non-empty array.
* - visit_array_end() - at the end `]` of a non-empty array.
* - visit_empty_array() - when an empty array is encountered.
*
* - visit_object_end() - at the start `]` of a non-empty object.
* - visit_object_start() - at the end `]` of a non-empty object.
* - visit_empty_object() - when an empty object is encountered.
* - visit_key(const uint8_t *key) - when a key in an object field is encountered. key is
* guaranteed to point at the first quote of the string (`"key"`).
* - visit_primitive(const uint8_t *value) - when a value is a string, number, boolean or null.
* - visit_root_primitive(iter, uint8_t *value) - when the top-level value is a string, number, boolean or null.
*
* - increment_count(iter) - each time a value is found in an array or object.
*/
template<bool STREAMING, typename V>
simdjson_warn_unused simdjson_inline error_code walk_document(V &visitor) noexcept;
/**
* Create an iterator capable of walking a JSON document.
*
* The document must have already passed through stage 1.
*/
simdjson_inline json_iterator(dom_parser_implementation &_dom_parser, size_t start_structural_index);
/**
* Look at the next token.
*
* Tokens can be strings, numbers, booleans, null, or operators (`[{]},:`)).
*
* They may include invalid JSON as well (such as `1.2.3` or `ture`).
*/
simdjson_inline const uint8_t *peek() const noexcept;
/**
* Advance to the next token.
*
* Tokens can be strings, numbers, booleans, null, or operators (`[{]},:`)).
*
* They may include invalid JSON as well (such as `1.2.3` or `ture`).
*/
simdjson_inline const uint8_t *advance() noexcept;
/**
* Get the remaining length of the document, from the start of the current token.
*/
simdjson_inline size_t remaining_len() const noexcept;
/**
* Check if we are at the end of the document.
*
* If this is true, there are no more tokens.
*/
simdjson_inline bool at_eof() const noexcept;
/**
* Check if we are at the beginning of the document.
*/
simdjson_inline bool at_beginning() const noexcept;
simdjson_inline uint8_t last_structural() const noexcept;
/**
* Log that a value has been found.
*
* Set LOG_ENABLED=true in logger.h to see logging.
*/
simdjson_inline void log_value(const char *type) const noexcept;
/**
* Log the start of a multipart value.
*
* Set LOG_ENABLED=true in logger.h to see logging.
*/
simdjson_inline void log_start_value(const char *type) const noexcept;
/**
* Log the end of a multipart value.
*
* Set LOG_ENABLED=true in logger.h to see logging.
*/
simdjson_inline void log_end_value(const char *type) const noexcept;
/**
* Log an error.
*
* Set LOG_ENABLED=true in logger.h to see logging.
*/
simdjson_inline void log_error(const char *error) const noexcept;
template<typename V>
simdjson_warn_unused simdjson_inline error_code visit_root_primitive(V &visitor, const uint8_t *value) noexcept;
template<typename V>
simdjson_warn_unused simdjson_inline error_code visit_primitive(V &visitor, const uint8_t *value) noexcept;
};
template<bool STREAMING, typename V>
simdjson_warn_unused simdjson_inline error_code json_iterator::walk_document(V &visitor) noexcept {
logger::log_start();
//
// Start the document
//
if (at_eof()) { return EMPTY; }
log_start_value("document");
SIMDJSON_TRY( visitor.visit_document_start(*this) );
//
// Read first value
//
{
auto value = advance();
// Make sure the outer object or array is closed before continuing; otherwise, there are ways we
// could get into memory corruption. See https://github.com/simdjson/simdjson/issues/906
if (!STREAMING) {
switch (*value) {
case '{': if (last_structural() != '}') { log_value("starting brace unmatched"); return TAPE_ERROR; }; break;
case '[': if (last_structural() != ']') { log_value("starting bracket unmatched"); return TAPE_ERROR; }; break;
}
}
switch (*value) {
case '{': if (*peek() == '}') { advance(); log_value("empty object"); SIMDJSON_TRY( visitor.visit_empty_object(*this) ); break; } goto object_begin;
case '[': if (*peek() == ']') { advance(); log_value("empty array"); SIMDJSON_TRY( visitor.visit_empty_array(*this) ); break; } goto array_begin;
default: SIMDJSON_TRY( visitor.visit_root_primitive(*this, value) ); break;
}
}
goto document_end;
//
// Object parser states
//
object_begin:
log_start_value("object");
depth++;
if (depth >= dom_parser.max_depth()) { log_error("Exceeded max depth!"); return DEPTH_ERROR; }
dom_parser.is_array[depth] = false;
SIMDJSON_TRY( visitor.visit_object_start(*this) );
{
auto key = advance();
if (*key != '"') { log_error("Object does not start with a key"); return TAPE_ERROR; }
SIMDJSON_TRY( visitor.increment_count(*this) );
SIMDJSON_TRY( visitor.visit_key(*this, key) );
}
object_field:
if (simdjson_unlikely( *advance() != ':' )) { log_error("Missing colon after key in object"); return TAPE_ERROR; }
{
auto value = advance();
switch (*value) {
case '{': if (*peek() == '}') { advance(); log_value("empty object"); SIMDJSON_TRY( visitor.visit_empty_object(*this) ); break; } goto object_begin;
case '[': if (*peek() == ']') { advance(); log_value("empty array"); SIMDJSON_TRY( visitor.visit_empty_array(*this) ); break; } goto array_begin;
default: SIMDJSON_TRY( visitor.visit_primitive(*this, value) ); break;
}
}
object_continue:
switch (*advance()) {
case ',':
SIMDJSON_TRY( visitor.increment_count(*this) );
{
auto key = advance();
if (simdjson_unlikely( *key != '"' )) { log_error("Key string missing at beginning of field in object"); return TAPE_ERROR; }
SIMDJSON_TRY( visitor.visit_key(*this, key) );
}
goto object_field;
case '}': log_end_value("object"); SIMDJSON_TRY( visitor.visit_object_end(*this) ); goto scope_end;
default: log_error("No comma between object fields"); return TAPE_ERROR;
}
scope_end:
depth--;
if (depth == 0) { goto document_end; }
if (dom_parser.is_array[depth]) { goto array_continue; }
goto object_continue;
//
// Array parser states
//
array_begin:
log_start_value("array");
depth++;
if (depth >= dom_parser.max_depth()) { log_error("Exceeded max depth!"); return DEPTH_ERROR; }
dom_parser.is_array[depth] = true;
SIMDJSON_TRY( visitor.visit_array_start(*this) );
SIMDJSON_TRY( visitor.increment_count(*this) );
array_value:
{
auto value = advance();
switch (*value) {
case '{': if (*peek() == '}') { advance(); log_value("empty object"); SIMDJSON_TRY( visitor.visit_empty_object(*this) ); break; } goto object_begin;
case '[': if (*peek() == ']') { advance(); log_value("empty array"); SIMDJSON_TRY( visitor.visit_empty_array(*this) ); break; } goto array_begin;
default: SIMDJSON_TRY( visitor.visit_primitive(*this, value) ); break;
}
}
array_continue:
switch (*advance()) {
case ',': SIMDJSON_TRY( visitor.increment_count(*this) ); goto array_value;
case ']': log_end_value("array"); SIMDJSON_TRY( visitor.visit_array_end(*this) ); goto scope_end;
default: log_error("Missing comma between array values"); return TAPE_ERROR;
}
document_end:
log_end_value("document");
SIMDJSON_TRY( visitor.visit_document_end(*this) );
dom_parser.next_structural_index = uint32_t(next_structural - &dom_parser.structural_indexes[0]);
// If we didn't make it to the end, it's an error
if ( !STREAMING && dom_parser.next_structural_index != dom_parser.n_structural_indexes ) {
log_error("More than one JSON value at the root of the document, or extra characters at the end of the JSON!");
return TAPE_ERROR;
}
return SUCCESS;
} // walk_document()
simdjson_inline json_iterator::json_iterator(dom_parser_implementation &_dom_parser, size_t start_structural_index)
: buf{_dom_parser.buf},
next_structural{&_dom_parser.structural_indexes[start_structural_index]},
dom_parser{_dom_parser} {
}
simdjson_inline const uint8_t *json_iterator::peek() const noexcept {
return &buf[*(next_structural)];
}
simdjson_inline const uint8_t *json_iterator::advance() noexcept {
return &buf[*(next_structural++)];
}
simdjson_inline size_t json_iterator::remaining_len() const noexcept {
return dom_parser.len - *(next_structural-1);
}
simdjson_inline bool json_iterator::at_eof() const noexcept {
return next_structural == &dom_parser.structural_indexes[dom_parser.n_structural_indexes];
}
simdjson_inline bool json_iterator::at_beginning() const noexcept {
return next_structural == dom_parser.structural_indexes.get();
}
simdjson_inline uint8_t json_iterator::last_structural() const noexcept {
return buf[dom_parser.structural_indexes[dom_parser.n_structural_indexes - 1]];
}
simdjson_inline void json_iterator::log_value(const char *type) const noexcept {
logger::log_line(*this, "", type, "");
}
simdjson_inline void json_iterator::log_start_value(const char *type) const noexcept {
logger::log_line(*this, "+", type, "");
if (logger::LOG_ENABLED) { logger::log_depth++; }
}
simdjson_inline void json_iterator::log_end_value(const char *type) const noexcept {
if (logger::LOG_ENABLED) { logger::log_depth--; }
logger::log_line(*this, "-", type, "");
}
simdjson_inline void json_iterator::log_error(const char *error) const noexcept {
logger::log_line(*this, "", "ERROR", error);
}
template<typename V>
simdjson_warn_unused simdjson_inline error_code json_iterator::visit_root_primitive(V &visitor, const uint8_t *value) noexcept {
switch (*value) {
case '"': return visitor.visit_root_string(*this, value);
case 't': return visitor.visit_root_true_atom(*this, value);
case 'f': return visitor.visit_root_false_atom(*this, value);
case 'n': return visitor.visit_root_null_atom(*this, value);
case '-':
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
return visitor.visit_root_number(*this, value);
default:
log_error("Document starts with a non-value character");
return TAPE_ERROR;
}
}
template<typename V>
simdjson_warn_unused simdjson_inline error_code json_iterator::visit_primitive(V &visitor, const uint8_t *value) noexcept {
// Use the fact that most scalars are going to be either strings or numbers.
if(*value == '"') {
return visitor.visit_string(*this, value);
} else if (((*value - '0') < 10) || (*value == '-')) {
return visitor.visit_number(*this, value);
}
// true, false, null are uncommon.
switch (*value) {
case 't': return visitor.visit_true_atom(*this, value);
case 'f': return visitor.visit_false_atom(*this, value);
case 'n': return visitor.visit_null_atom(*this, value);
default:
log_error("Non-value found when value was expected!");
return TAPE_ERROR;
}
}
} // namespace stage2
} // unnamed namespace
} // namespace westmere
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE2_JSON_ITERATOR_H
/* end file generic/stage2/json_iterator.h for westmere */
/* including generic/stage2/stringparsing.h for westmere: #include <generic/stage2/stringparsing.h> */
/* begin file generic/stage2/stringparsing.h for westmere */
#ifndef SIMDJSON_SRC_GENERIC_STAGE2_STRINGPARSING_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE2_STRINGPARSING_H */
/* amalgamation skipped (editor-only): #include <generic/stage2/base.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/jsoncharutils.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
// This file contains the common code every implementation uses
// It is intended to be included multiple times and compiled multiple times
namespace simdjson {
namespace westmere {
namespace {
/// @private
namespace stringparsing {
// begin copypasta
// These chars yield themselves: " \ /
// b -> backspace, f -> formfeed, n -> newline, r -> cr, t -> horizontal tab
// u not handled in this table as it's complex
static const uint8_t escape_map[256] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x0.
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0x22, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x2f,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x4.
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x5c, 0, 0, 0, // 0x5.
0, 0, 0x08, 0, 0, 0, 0x0c, 0, 0, 0, 0, 0, 0, 0, 0x0a, 0, // 0x6.
0, 0, 0x0d, 0, 0x09, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x7.
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
};
// handle a unicode codepoint
// write appropriate values into dest
// src will advance 6 bytes or 12 bytes
// dest will advance a variable amount (return via pointer)
// return true if the unicode codepoint was valid
// We work in little-endian then swap at write time
simdjson_warn_unused
simdjson_inline bool handle_unicode_codepoint(const uint8_t **src_ptr,
uint8_t **dst_ptr, bool allow_replacement) {
// Use the default Unicode Character 'REPLACEMENT CHARACTER' (U+FFFD)
constexpr uint32_t substitution_code_point = 0xfffd;
// jsoncharutils::hex_to_u32_nocheck fills high 16 bits of the return value with 1s if the
// conversion is not valid; we defer the check for this to inside the
// multilingual plane check.
uint32_t code_point = jsoncharutils::hex_to_u32_nocheck(*src_ptr + 2);
*src_ptr += 6;
// If we found a high surrogate, we must
// check for low surrogate for characters
// outside the Basic
// Multilingual Plane.
if (code_point >= 0xd800 && code_point < 0xdc00) {
const uint8_t *src_data = *src_ptr;
/* Compiler optimizations convert this to a single 16-bit load and compare on most platforms */
if (((src_data[0] << 8) | src_data[1]) != ((static_cast<uint8_t> ('\\') << 8) | static_cast<uint8_t> ('u'))) {
if(!allow_replacement) { return false; }
code_point = substitution_code_point;
} else {
uint32_t code_point_2 = jsoncharutils::hex_to_u32_nocheck(src_data + 2);
// We have already checked that the high surrogate is valid and
// (code_point - 0xd800) < 1024.
//
// Check that code_point_2 is in the range 0xdc00..0xdfff
// and that code_point_2 was parsed from valid hex.
uint32_t low_bit = code_point_2 - 0xdc00;
if (low_bit >> 10) {
if(!allow_replacement) { return false; }
code_point = substitution_code_point;
} else {
code_point = (((code_point - 0xd800) << 10) | low_bit) + 0x10000;
*src_ptr += 6;
}
}
} else if (code_point >= 0xdc00 && code_point <= 0xdfff) {
// If we encounter a low surrogate (not preceded by a high surrogate)
// then we have an error.
if(!allow_replacement) { return false; }
code_point = substitution_code_point;
}
size_t offset = jsoncharutils::codepoint_to_utf8(code_point, *dst_ptr);
*dst_ptr += offset;
return offset > 0;
}
// handle a unicode codepoint using the wobbly convention
// https://simonsapin.github.io/wtf-8/
// write appropriate values into dest
// src will advance 6 bytes or 12 bytes
// dest will advance a variable amount (return via pointer)
// return true if the unicode codepoint was valid
// We work in little-endian then swap at write time
simdjson_warn_unused
simdjson_inline bool handle_unicode_codepoint_wobbly(const uint8_t **src_ptr,
uint8_t **dst_ptr) {
// It is not ideal that this function is nearly identical to handle_unicode_codepoint.
//
// jsoncharutils::hex_to_u32_nocheck fills high 16 bits of the return value with 1s if the
// conversion is not valid; we defer the check for this to inside the
// multilingual plane check.
uint32_t code_point = jsoncharutils::hex_to_u32_nocheck(*src_ptr + 2);
*src_ptr += 6;
// If we found a high surrogate, we must
// check for low surrogate for characters
// outside the Basic
// Multilingual Plane.
if (code_point >= 0xd800 && code_point < 0xdc00) {
const uint8_t *src_data = *src_ptr;
/* Compiler optimizations convert this to a single 16-bit load and compare on most platforms */
if (((src_data[0] << 8) | src_data[1]) == ((static_cast<uint8_t> ('\\') << 8) | static_cast<uint8_t> ('u'))) {
uint32_t code_point_2 = jsoncharutils::hex_to_u32_nocheck(src_data + 2);
uint32_t low_bit = code_point_2 - 0xdc00;
if ((low_bit >> 10) == 0) {
code_point =
(((code_point - 0xd800) << 10) | low_bit) + 0x10000;
*src_ptr += 6;
}
}
}
size_t offset = jsoncharutils::codepoint_to_utf8(code_point, *dst_ptr);
*dst_ptr += offset;
return offset > 0;
}
/**
* Unescape a valid UTF-8 string from src to dst, stopping at a final unescaped quote. There
* must be an unescaped quote terminating the string. It returns the final output
* position as pointer. In case of error (e.g., the string has bad escaped codes),
* then null_nullptrptr is returned. It is assumed that the output buffer is large
* enough. E.g., if src points at 'joe"', then dst needs to have four free bytes +
* SIMDJSON_PADDING bytes.
*/
simdjson_warn_unused simdjson_inline uint8_t *parse_string(const uint8_t *src, uint8_t *dst, bool allow_replacement) {
while (1) {
// Copy the next n bytes, and find the backslash and quote in them.
auto bs_quote = backslash_and_quote::copy_and_find(src, dst);
// If the next thing is the end quote, copy and return
if (bs_quote.has_quote_first()) {
// we encountered quotes first. Move dst to point to quotes and exit
return dst + bs_quote.quote_index();
}
if (bs_quote.has_backslash()) {
/* find out where the backspace is */
auto bs_dist = bs_quote.backslash_index();
uint8_t escape_char = src[bs_dist + 1];
/* we encountered backslash first. Handle backslash */
if (escape_char == 'u') {
/* move src/dst up to the start; they will be further adjusted
within the unicode codepoint handling code. */
src += bs_dist;
dst += bs_dist;
if (!handle_unicode_codepoint(&src, &dst, allow_replacement)) {
return nullptr;
}
} else {
/* simple 1:1 conversion. Will eat bs_dist+2 characters in input and
* write bs_dist+1 characters to output
* note this may reach beyond the part of the buffer we've actually
* seen. I think this is ok */
uint8_t escape_result = escape_map[escape_char];
if (escape_result == 0u) {
return nullptr; /* bogus escape value is an error */
}
dst[bs_dist] = escape_result;
src += bs_dist + 2;
dst += bs_dist + 1;
}
} else {
/* they are the same. Since they can't co-occur, it means we
* encountered neither. */
src += backslash_and_quote::BYTES_PROCESSED;
dst += backslash_and_quote::BYTES_PROCESSED;
}
}
}
simdjson_warn_unused simdjson_inline uint8_t *parse_wobbly_string(const uint8_t *src, uint8_t *dst) {
// It is not ideal that this function is nearly identical to parse_string.
while (1) {
// Copy the next n bytes, and find the backslash and quote in them.
auto bs_quote = backslash_and_quote::copy_and_find(src, dst);
// If the next thing is the end quote, copy and return
if (bs_quote.has_quote_first()) {
// we encountered quotes first. Move dst to point to quotes and exit
return dst + bs_quote.quote_index();
}
if (bs_quote.has_backslash()) {
/* find out where the backspace is */
auto bs_dist = bs_quote.backslash_index();
uint8_t escape_char = src[bs_dist + 1];
/* we encountered backslash first. Handle backslash */
if (escape_char == 'u') {
/* move src/dst up to the start; they will be further adjusted
within the unicode codepoint handling code. */
src += bs_dist;
dst += bs_dist;
if (!handle_unicode_codepoint_wobbly(&src, &dst)) {
return nullptr;
}
} else {
/* simple 1:1 conversion. Will eat bs_dist+2 characters in input and
* write bs_dist+1 characters to output
* note this may reach beyond the part of the buffer we've actually
* seen. I think this is ok */
uint8_t escape_result = escape_map[escape_char];
if (escape_result == 0u) {
return nullptr; /* bogus escape value is an error */
}
dst[bs_dist] = escape_result;
src += bs_dist + 2;
dst += bs_dist + 1;
}
} else {
/* they are the same. Since they can't co-occur, it means we
* encountered neither. */
src += backslash_and_quote::BYTES_PROCESSED;
dst += backslash_and_quote::BYTES_PROCESSED;
}
}
}
} // namespace stringparsing
} // unnamed namespace
} // namespace westmere
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE2_STRINGPARSING_H
/* end file generic/stage2/stringparsing.h for westmere */
/* including generic/stage2/structural_iterator.h for westmere: #include <generic/stage2/structural_iterator.h> */
/* begin file generic/stage2/structural_iterator.h for westmere */
#ifndef SIMDJSON_SRC_GENERIC_STAGE2_STRUCTURAL_ITERATOR_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE2_STRUCTURAL_ITERATOR_H */
/* amalgamation skipped (editor-only): #include <generic/stage2/base.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/dom_parser_implementation.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace westmere {
namespace {
namespace stage2 {
class structural_iterator {
public:
const uint8_t* const buf;
uint32_t *next_structural;
dom_parser_implementation &dom_parser;
// Start a structural
simdjson_inline structural_iterator(dom_parser_implementation &_dom_parser, size_t start_structural_index)
: buf{_dom_parser.buf},
next_structural{&_dom_parser.structural_indexes[start_structural_index]},
dom_parser{_dom_parser} {
}
// Get the buffer position of the current structural character
simdjson_inline const uint8_t* current() {
return &buf[*(next_structural-1)];
}
// Get the current structural character
simdjson_inline char current_char() {
return buf[*(next_structural-1)];
}
// Get the next structural character without advancing
simdjson_inline char peek_next_char() {
return buf[*next_structural];
}
simdjson_inline const uint8_t* peek() {
return &buf[*next_structural];
}
simdjson_inline const uint8_t* advance() {
return &buf[*(next_structural++)];
}
simdjson_inline char advance_char() {
return buf[*(next_structural++)];
}
simdjson_inline size_t remaining_len() {
return dom_parser.len - *(next_structural-1);
}
simdjson_inline bool at_end() {
return next_structural == &dom_parser.structural_indexes[dom_parser.n_structural_indexes];
}
simdjson_inline bool at_beginning() {
return next_structural == dom_parser.structural_indexes.get();
}
};
} // namespace stage2
} // unnamed namespace
} // namespace westmere
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE2_STRUCTURAL_ITERATOR_H
/* end file generic/stage2/structural_iterator.h for westmere */
/* including generic/stage2/tape_builder.h for westmere: #include <generic/stage2/tape_builder.h> */
/* begin file generic/stage2/tape_builder.h for westmere */
#ifndef SIMDJSON_SRC_GENERIC_STAGE2_TAPE_BUILDER_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE2_TAPE_BUILDER_H */
/* amalgamation skipped (editor-only): #include <generic/stage2/base.h> */
/* amalgamation skipped (editor-only): #include <generic/stage2/json_iterator.h> */
/* amalgamation skipped (editor-only): #include <generic/stage2/stringparsing.h> */
/* amalgamation skipped (editor-only): #include <generic/stage2/tape_writer.h> */
/* amalgamation skipped (editor-only): #include <simdjson/dom/document.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/atomparsing.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/dom_parser_implementation.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/numberparsing.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace westmere {
namespace {
namespace stage2 {
struct tape_builder {
template<bool STREAMING>
simdjson_warn_unused static simdjson_inline error_code parse_document(
dom_parser_implementation &dom_parser,
dom::document &doc) noexcept;
/** Called when a non-empty document starts. */
simdjson_warn_unused simdjson_inline error_code visit_document_start(json_iterator &iter) noexcept;
/** Called when a non-empty document ends without error. */
simdjson_warn_unused simdjson_inline error_code visit_document_end(json_iterator &iter) noexcept;
/** Called when a non-empty array starts. */
simdjson_warn_unused simdjson_inline error_code visit_array_start(json_iterator &iter) noexcept;
/** Called when a non-empty array ends. */
simdjson_warn_unused simdjson_inline error_code visit_array_end(json_iterator &iter) noexcept;
/** Called when an empty array is found. */
simdjson_warn_unused simdjson_inline error_code visit_empty_array(json_iterator &iter) noexcept;
/** Called when a non-empty object starts. */
simdjson_warn_unused simdjson_inline error_code visit_object_start(json_iterator &iter) noexcept;
/**
* Called when a key in a field is encountered.
*
* primitive, visit_object_start, visit_empty_object, visit_array_start, or visit_empty_array
* will be called after this with the field value.
*/
simdjson_warn_unused simdjson_inline error_code visit_key(json_iterator &iter, const uint8_t *key) noexcept;
/** Called when a non-empty object ends. */
simdjson_warn_unused simdjson_inline error_code visit_object_end(json_iterator &iter) noexcept;
/** Called when an empty object is found. */
simdjson_warn_unused simdjson_inline error_code visit_empty_object(json_iterator &iter) noexcept;
/**
* Called when a string, number, boolean or null is found.
*/
simdjson_warn_unused simdjson_inline error_code visit_primitive(json_iterator &iter, const uint8_t *value) noexcept;
/**
* Called when a string, number, boolean or null is found at the top level of a document (i.e.
* when there is no array or object and the entire document is a single string, number, boolean or
* null.
*
* This is separate from primitive() because simdjson's normal primitive parsing routines assume
* there is at least one more token after the value, which is only true in an array or object.
*/
simdjson_warn_unused simdjson_inline error_code visit_root_primitive(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_string(json_iterator &iter, const uint8_t *value, bool key = false) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_number(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_true_atom(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_false_atom(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_null_atom(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_root_string(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_root_number(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_root_true_atom(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_root_false_atom(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_root_null_atom(json_iterator &iter, const uint8_t *value) noexcept;
/** Called each time a new field or element in an array or object is found. */
simdjson_warn_unused simdjson_inline error_code increment_count(json_iterator &iter) noexcept;
/** Next location to write to tape */
tape_writer tape;
private:
/** Next write location in the string buf for stage 2 parsing */
uint8_t *current_string_buf_loc;
simdjson_inline tape_builder(dom::document &doc) noexcept;
simdjson_inline uint32_t next_tape_index(json_iterator &iter) const noexcept;
simdjson_inline void start_container(json_iterator &iter) noexcept;
simdjson_warn_unused simdjson_inline error_code end_container(json_iterator &iter, internal::tape_type start, internal::tape_type end) noexcept;
simdjson_warn_unused simdjson_inline error_code empty_container(json_iterator &iter, internal::tape_type start, internal::tape_type end) noexcept;
simdjson_inline uint8_t *on_start_string(json_iterator &iter) noexcept;
simdjson_inline void on_end_string(uint8_t *dst) noexcept;
}; // struct tape_builder
template<bool STREAMING>
simdjson_warn_unused simdjson_inline error_code tape_builder::parse_document(
dom_parser_implementation &dom_parser,
dom::document &doc) noexcept {
dom_parser.doc = &doc;
json_iterator iter(dom_parser, STREAMING ? dom_parser.next_structural_index : 0);
tape_builder builder(doc);
return iter.walk_document<STREAMING>(builder);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_root_primitive(json_iterator &iter, const uint8_t *value) noexcept {
return iter.visit_root_primitive(*this, value);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_primitive(json_iterator &iter, const uint8_t *value) noexcept {
return iter.visit_primitive(*this, value);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_empty_object(json_iterator &iter) noexcept {
return empty_container(iter, internal::tape_type::START_OBJECT, internal::tape_type::END_OBJECT);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_empty_array(json_iterator &iter) noexcept {
return empty_container(iter, internal::tape_type::START_ARRAY, internal::tape_type::END_ARRAY);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_document_start(json_iterator &iter) noexcept {
start_container(iter);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_object_start(json_iterator &iter) noexcept {
start_container(iter);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_array_start(json_iterator &iter) noexcept {
start_container(iter);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_object_end(json_iterator &iter) noexcept {
return end_container(iter, internal::tape_type::START_OBJECT, internal::tape_type::END_OBJECT);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_array_end(json_iterator &iter) noexcept {
return end_container(iter, internal::tape_type::START_ARRAY, internal::tape_type::END_ARRAY);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_document_end(json_iterator &iter) noexcept {
constexpr uint32_t start_tape_index = 0;
tape.append(start_tape_index, internal::tape_type::ROOT);
tape_writer::write(iter.dom_parser.doc->tape[start_tape_index], next_tape_index(iter), internal::tape_type::ROOT);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_key(json_iterator &iter, const uint8_t *key) noexcept {
return visit_string(iter, key, true);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::increment_count(json_iterator &iter) noexcept {
iter.dom_parser.open_containers[iter.depth].count++; // we have a key value pair in the object at parser.dom_parser.depth - 1
return SUCCESS;
}
simdjson_inline tape_builder::tape_builder(dom::document &doc) noexcept : tape{doc.tape.get()}, current_string_buf_loc{doc.string_buf.get()} {}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_string(json_iterator &iter, const uint8_t *value, bool key) noexcept {
iter.log_value(key ? "key" : "string");
uint8_t *dst = on_start_string(iter);
dst = stringparsing::parse_string(value+1, dst, false); // We do not allow replacement when the escape characters are invalid.
if (dst == nullptr) {
iter.log_error("Invalid escape in string");
return STRING_ERROR;
}
on_end_string(dst);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_root_string(json_iterator &iter, const uint8_t *value) noexcept {
return visit_string(iter, value);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_number(json_iterator &iter, const uint8_t *value) noexcept {
iter.log_value("number");
return numberparsing::parse_number(value, tape);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_root_number(json_iterator &iter, const uint8_t *value) noexcept {
//
// We need to make a copy to make sure that the string is space terminated.
// This is not about padding the input, which should already padded up
// to len + SIMDJSON_PADDING. However, we have no control at this stage
// on how the padding was done. What if the input string was padded with nulls?
// It is quite common for an input string to have an extra null character (C string).
// We do not want to allow 9\0 (where \0 is the null character) inside a JSON
// document, but the string "9\0" by itself is fine. So we make a copy and
// pad the input with spaces when we know that there is just one input element.
// This copy is relatively expensive, but it will almost never be called in
// practice unless you are in the strange scenario where you have many JSON
// documents made of single atoms.
//
std::unique_ptr<uint8_t[]>copy(new (std::nothrow) uint8_t[iter.remaining_len() + SIMDJSON_PADDING]);
if (copy.get() == nullptr) { return MEMALLOC; }
std::memcpy(copy.get(), value, iter.remaining_len());
std::memset(copy.get() + iter.remaining_len(), ' ', SIMDJSON_PADDING);
error_code error = visit_number(iter, copy.get());
return error;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_true_atom(json_iterator &iter, const uint8_t *value) noexcept {
iter.log_value("true");
if (!atomparsing::is_valid_true_atom(value)) { return T_ATOM_ERROR; }
tape.append(0, internal::tape_type::TRUE_VALUE);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_root_true_atom(json_iterator &iter, const uint8_t *value) noexcept {
iter.log_value("true");
if (!atomparsing::is_valid_true_atom(value, iter.remaining_len())) { return T_ATOM_ERROR; }
tape.append(0, internal::tape_type::TRUE_VALUE);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_false_atom(json_iterator &iter, const uint8_t *value) noexcept {
iter.log_value("false");
if (!atomparsing::is_valid_false_atom(value)) { return F_ATOM_ERROR; }
tape.append(0, internal::tape_type::FALSE_VALUE);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_root_false_atom(json_iterator &iter, const uint8_t *value) noexcept {
iter.log_value("false");
if (!atomparsing::is_valid_false_atom(value, iter.remaining_len())) { return F_ATOM_ERROR; }
tape.append(0, internal::tape_type::FALSE_VALUE);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_null_atom(json_iterator &iter, const uint8_t *value) noexcept {
iter.log_value("null");
if (!atomparsing::is_valid_null_atom(value)) { return N_ATOM_ERROR; }
tape.append(0, internal::tape_type::NULL_VALUE);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_root_null_atom(json_iterator &iter, const uint8_t *value) noexcept {
iter.log_value("null");
if (!atomparsing::is_valid_null_atom(value, iter.remaining_len())) { return N_ATOM_ERROR; }
tape.append(0, internal::tape_type::NULL_VALUE);
return SUCCESS;
}
// private:
simdjson_inline uint32_t tape_builder::next_tape_index(json_iterator &iter) const noexcept {
return uint32_t(tape.next_tape_loc - iter.dom_parser.doc->tape.get());
}
simdjson_warn_unused simdjson_inline error_code tape_builder::empty_container(json_iterator &iter, internal::tape_type start, internal::tape_type end) noexcept {
auto start_index = next_tape_index(iter);
tape.append(start_index+2, start);
tape.append(start_index, end);
return SUCCESS;
}
simdjson_inline void tape_builder::start_container(json_iterator &iter) noexcept {
iter.dom_parser.open_containers[iter.depth].tape_index = next_tape_index(iter);
iter.dom_parser.open_containers[iter.depth].count = 0;
tape.skip(); // We don't actually *write* the start element until the end.
}
simdjson_warn_unused simdjson_inline error_code tape_builder::end_container(json_iterator &iter, internal::tape_type start, internal::tape_type end) noexcept {
// Write the ending tape element, pointing at the start location
const uint32_t start_tape_index = iter.dom_parser.open_containers[iter.depth].tape_index;
tape.append(start_tape_index, end);
// Write the start tape element, pointing at the end location (and including count)
// count can overflow if it exceeds 24 bits... so we saturate
// the convention being that a cnt of 0xffffff or more is undetermined in value (>= 0xffffff).
const uint32_t count = iter.dom_parser.open_containers[iter.depth].count;
const uint32_t cntsat = count > 0xFFFFFF ? 0xFFFFFF : count;
tape_writer::write(iter.dom_parser.doc->tape[start_tape_index], next_tape_index(iter) | (uint64_t(cntsat) << 32), start);
return SUCCESS;
}
simdjson_inline uint8_t *tape_builder::on_start_string(json_iterator &iter) noexcept {
// we advance the point, accounting for the fact that we have a NULL termination
tape.append(current_string_buf_loc - iter.dom_parser.doc->string_buf.get(), internal::tape_type::STRING);
return current_string_buf_loc + sizeof(uint32_t);
}
simdjson_inline void tape_builder::on_end_string(uint8_t *dst) noexcept {
uint32_t str_length = uint32_t(dst - (current_string_buf_loc + sizeof(uint32_t)));
// TODO check for overflow in case someone has a crazy string (>=4GB?)
// But only add the overflow check when the document itself exceeds 4GB
// Currently unneeded because we refuse to parse docs larger or equal to 4GB.
memcpy(current_string_buf_loc, &str_length, sizeof(uint32_t));
// NULL termination is still handy if you expect all your strings to
// be NULL terminated? It comes at a small cost
*dst = 0;
current_string_buf_loc = dst + 1;
}
} // namespace stage2
} // unnamed namespace
} // namespace westmere
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE2_TAPE_BUILDER_H
/* end file generic/stage2/tape_builder.h for westmere */
/* end file generic/stage2/amalgamated.h for westmere */
//
// Stage 1
//
namespace simdjson {
namespace westmere {
simdjson_warn_unused error_code implementation::create_dom_parser_implementation(
size_t capacity,
size_t max_depth,
std::unique_ptr<internal::dom_parser_implementation>& dst
) const noexcept {
dst.reset( new (std::nothrow) dom_parser_implementation() );
if (!dst) { return MEMALLOC; }
if (auto err = dst->set_capacity(capacity))
return err;
if (auto err = dst->set_max_depth(max_depth))
return err;
return SUCCESS;
}
namespace {
using namespace simd;
simdjson_inline json_character_block json_character_block::classify(const simd::simd8x64<uint8_t>& in) {
// These lookups rely on the fact that anything < 127 will match the lower 4 bits, which is why
// we can't use the generic lookup_16.
auto whitespace_table = simd8<uint8_t>::repeat_16(' ', 100, 100, 100, 17, 100, 113, 2, 100, '\t', '\n', 112, 100, '\r', 100, 100);
// The 6 operators (:,[]{}) have these values:
//
// , 2C
// : 3A
// [ 5B
// { 7B
// ] 5D
// } 7D
//
// If you use | 0x20 to turn [ and ] into { and }, the lower 4 bits of each character is unique.
// We exploit this, using a simd 4-bit lookup to tell us which character match against, and then
// match it (against | 0x20).
//
// To prevent recognizing other characters, everything else gets compared with 0, which cannot
// match due to the | 0x20.
//
// NOTE: Due to the | 0x20, this ALSO treats <FF> and <SUB> (control characters 0C and 1A) like ,
// and :. This gets caught in stage 2, which checks the actual character to ensure the right
// operators are in the right places.
const auto op_table = simd8<uint8_t>::repeat_16(
0, 0, 0, 0,
0, 0, 0, 0,
0, 0, ':', '{', // : = 3A, [ = 5B, { = 7B
',', '}', 0, 0 // , = 2C, ] = 5D, } = 7D
);
// We compute whitespace and op separately. If the code later only use one or the
// other, given the fact that all functions are aggressively inlined, we can
// hope that useless computations will be omitted. This is namely case when
// minifying (we only need whitespace).
const uint64_t whitespace = in.eq({
_mm_shuffle_epi8(whitespace_table, in.chunks[0]),
_mm_shuffle_epi8(whitespace_table, in.chunks[1]),
_mm_shuffle_epi8(whitespace_table, in.chunks[2]),
_mm_shuffle_epi8(whitespace_table, in.chunks[3])
});
// Turn [ and ] into { and }
const simd8x64<uint8_t> curlified{
in.chunks[0] | 0x20,
in.chunks[1] | 0x20,
in.chunks[2] | 0x20,
in.chunks[3] | 0x20
};
const uint64_t op = curlified.eq({
_mm_shuffle_epi8(op_table, in.chunks[0]),
_mm_shuffle_epi8(op_table, in.chunks[1]),
_mm_shuffle_epi8(op_table, in.chunks[2]),
_mm_shuffle_epi8(op_table, in.chunks[3])
});
return { whitespace, op };
}
simdjson_inline bool is_ascii(const simd8x64<uint8_t>& input) {
return input.reduce_or().is_ascii();
}
simdjson_unused simdjson_inline simd8<bool> must_be_continuation(const simd8<uint8_t> prev1, const simd8<uint8_t> prev2, const simd8<uint8_t> prev3) {
simd8<uint8_t> is_second_byte = prev1.saturating_sub(0xc0u-1); // Only 11______ will be > 0
simd8<uint8_t> is_third_byte = prev2.saturating_sub(0xe0u-1); // Only 111_____ will be > 0
simd8<uint8_t> is_fourth_byte = prev3.saturating_sub(0xf0u-1); // Only 1111____ will be > 0
// Caller requires a bool (all 1's). All values resulting from the subtraction will be <= 64, so signed comparison is fine.
return simd8<int8_t>(is_second_byte | is_third_byte | is_fourth_byte) > int8_t(0);
}
simdjson_inline simd8<uint8_t> must_be_2_3_continuation(const simd8<uint8_t> prev2, const simd8<uint8_t> prev3) {
simd8<uint8_t> is_third_byte = prev2.saturating_sub(0xe0u-0x80); // Only 111_____ will be >= 0x80
simd8<uint8_t> is_fourth_byte = prev3.saturating_sub(0xf0u-0x80); // Only 1111____ will be >= 0x80
return is_third_byte | is_fourth_byte;
}
} // unnamed namespace
} // namespace westmere
} // namespace simdjson
//
// Stage 2
//
//
// Implementation-specific overrides
//
namespace simdjson {
namespace westmere {
simdjson_warn_unused error_code implementation::minify(const uint8_t *buf, size_t len, uint8_t *dst, size_t &dst_len) const noexcept {
return westmere::stage1::json_minifier::minify<64>(buf, len, dst, dst_len);
}
simdjson_warn_unused error_code dom_parser_implementation::stage1(const uint8_t *_buf, size_t _len, stage1_mode streaming) noexcept {
this->buf = _buf;
this->len = _len;
return westmere::stage1::json_structural_indexer::index<64>(_buf, _len, *this, streaming);
}
simdjson_warn_unused bool implementation::validate_utf8(const char *buf, size_t len) const noexcept {
return westmere::stage1::generic_validate_utf8(buf,len);
}
simdjson_warn_unused error_code dom_parser_implementation::stage2(dom::document &_doc) noexcept {
return stage2::tape_builder::parse_document<false>(*this, _doc);
}
simdjson_warn_unused error_code dom_parser_implementation::stage2_next(dom::document &_doc) noexcept {
return stage2::tape_builder::parse_document<true>(*this, _doc);
}
simdjson_warn_unused uint8_t *dom_parser_implementation::parse_string(const uint8_t *src, uint8_t *dst, bool replacement_char) const noexcept {
return westmere::stringparsing::parse_string(src, dst, replacement_char);
}
simdjson_warn_unused uint8_t *dom_parser_implementation::parse_wobbly_string(const uint8_t *src, uint8_t *dst) const noexcept {
return westmere::stringparsing::parse_wobbly_string(src, dst);
}
simdjson_warn_unused error_code dom_parser_implementation::parse(const uint8_t *_buf, size_t _len, dom::document &_doc) noexcept {
auto error = stage1(_buf, _len, stage1_mode::regular);
if (error) { return error; }
return stage2(_doc);
}
} // namespace westmere
} // namespace simdjson
/* including simdjson/westmere/end.h: #include <simdjson/westmere/end.h> */
/* begin file simdjson/westmere/end.h */
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/westmere/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#if !SIMDJSON_CAN_ALWAYS_RUN_WESTMERE
SIMDJSON_UNTARGET_REGION
#endif
/* undefining SIMDJSON_IMPLEMENTATION from "westmere" */
#undef SIMDJSON_IMPLEMENTATION
/* end file simdjson/westmere/end.h */
#endif // SIMDJSON_SRC_WESTMERE_CPP
/* end file westmere.cpp */
#endif
#if SIMDJSON_IMPLEMENTATION_FALLBACK
/* including fallback.cpp: #include <fallback.cpp> */
/* begin file fallback.cpp */
#ifndef SIMDJSON_SRC_FALLBACK_CPP
#define SIMDJSON_SRC_FALLBACK_CPP
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include <base.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
/* including simdjson/fallback.h: #include <simdjson/fallback.h> */
/* begin file simdjson/fallback.h */
#ifndef SIMDJSON_FALLBACK_H
#define SIMDJSON_FALLBACK_H
/* including simdjson/fallback/begin.h: #include "simdjson/fallback/begin.h" */
/* begin file simdjson/fallback/begin.h */
/* defining SIMDJSON_IMPLEMENTATION to "fallback" */
#define SIMDJSON_IMPLEMENTATION fallback
/* including simdjson/fallback/base.h: #include "simdjson/fallback/base.h" */
/* begin file simdjson/fallback/base.h */
#ifndef SIMDJSON_FALLBACK_BASE_H
#define SIMDJSON_FALLBACK_BASE_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
/**
* Fallback implementation (runs on any machine).
*/
namespace fallback {
class implementation;
} // namespace fallback
} // namespace simdjson
#endif // SIMDJSON_FALLBACK_BASE_H
/* end file simdjson/fallback/base.h */
/* including simdjson/fallback/bitmanipulation.h: #include "simdjson/fallback/bitmanipulation.h" */
/* begin file simdjson/fallback/bitmanipulation.h */
#ifndef SIMDJSON_FALLBACK_BITMANIPULATION_H
#define SIMDJSON_FALLBACK_BITMANIPULATION_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/fallback/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace fallback {
namespace {
#if defined(_MSC_VER) && !defined(_M_ARM64) && !defined(_M_X64)
static inline unsigned char _BitScanForward64(unsigned long* ret, uint64_t x) {
unsigned long x0 = (unsigned long)x, top, bottom;
_BitScanForward(&top, (unsigned long)(x >> 32));
_BitScanForward(&bottom, x0);
*ret = x0 ? bottom : 32 + top;
return x != 0;
}
static unsigned char _BitScanReverse64(unsigned long* ret, uint64_t x) {
unsigned long x1 = (unsigned long)(x >> 32), top, bottom;
_BitScanReverse(&top, x1);
_BitScanReverse(&bottom, (unsigned long)x);
*ret = x1 ? top + 32 : bottom;
return x != 0;
}
#endif
/* result might be undefined when input_num is zero */
simdjson_inline int leading_zeroes(uint64_t input_num) {
#ifdef _MSC_VER
unsigned long leading_zero = 0;
// Search the mask data from most significant bit (MSB)
// to least significant bit (LSB) for a set bit (1).
if (_BitScanReverse64(&leading_zero, input_num))
return (int)(63 - leading_zero);
else
return 64;
#else
return __builtin_clzll(input_num);
#endif// _MSC_VER
}
} // unnamed namespace
} // namespace fallback
} // namespace simdjson
#endif // SIMDJSON_FALLBACK_BITMANIPULATION_H
/* end file simdjson/fallback/bitmanipulation.h */
/* including simdjson/fallback/stringparsing_defs.h: #include "simdjson/fallback/stringparsing_defs.h" */
/* begin file simdjson/fallback/stringparsing_defs.h */
#ifndef SIMDJSON_FALLBACK_STRINGPARSING_DEFS_H
#define SIMDJSON_FALLBACK_STRINGPARSING_DEFS_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/fallback/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace fallback {
namespace {
// Holds backslashes and quotes locations.
struct backslash_and_quote {
public:
static constexpr uint32_t BYTES_PROCESSED = 1;
simdjson_inline static backslash_and_quote copy_and_find(const uint8_t *src, uint8_t *dst);
simdjson_inline bool has_quote_first() { return c == '"'; }
simdjson_inline bool has_backslash() { return c == '\\'; }
simdjson_inline int quote_index() { return c == '"' ? 0 : 1; }
simdjson_inline int backslash_index() { return c == '\\' ? 0 : 1; }
uint8_t c;
}; // struct backslash_and_quote
simdjson_inline backslash_and_quote backslash_and_quote::copy_and_find(const uint8_t *src, uint8_t *dst) {
// store to dest unconditionally - we can overwrite the bits we don't like later
dst[0] = src[0];
return { src[0] };
}
} // unnamed namespace
} // namespace fallback
} // namespace simdjson
#endif // SIMDJSON_FALLBACK_STRINGPARSING_DEFS_H
/* end file simdjson/fallback/stringparsing_defs.h */
/* including simdjson/fallback/numberparsing_defs.h: #include "simdjson/fallback/numberparsing_defs.h" */
/* begin file simdjson/fallback/numberparsing_defs.h */
#ifndef SIMDJSON_FALLBACK_NUMBERPARSING_DEFS_H
#define SIMDJSON_FALLBACK_NUMBERPARSING_DEFS_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/fallback/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/numberparsing_tables.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#include <cstring>
#ifdef JSON_TEST_NUMBERS // for unit testing
void found_invalid_number(const uint8_t *buf);
void found_integer(int64_t result, const uint8_t *buf);
void found_unsigned_integer(uint64_t result, const uint8_t *buf);
void found_float(double result, const uint8_t *buf);
#endif
namespace simdjson {
namespace fallback {
namespace numberparsing {
// credit: https://johnnylee-sde.github.io/Fast-numeric-string-to-int/
/** @private */
static simdjson_inline uint32_t parse_eight_digits_unrolled(const char *chars) {
uint64_t val;
memcpy(&val, chars, sizeof(uint64_t));
val = (val & 0x0F0F0F0F0F0F0F0F) * 2561 >> 8;
val = (val & 0x00FF00FF00FF00FF) * 6553601 >> 16;
return uint32_t((val & 0x0000FFFF0000FFFF) * 42949672960001 >> 32);
}
/** @private */
static simdjson_inline uint32_t parse_eight_digits_unrolled(const uint8_t *chars) {
return parse_eight_digits_unrolled(reinterpret_cast<const char *>(chars));
}
#if SIMDJSON_IS_32BITS // _umul128 for x86, arm
// this is a slow emulation routine for 32-bit
//
static simdjson_inline uint64_t __emulu(uint32_t x, uint32_t y) {
return x * (uint64_t)y;
}
static simdjson_inline uint64_t _umul128(uint64_t ab, uint64_t cd, uint64_t *hi) {
uint64_t ad = __emulu((uint32_t)(ab >> 32), (uint32_t)cd);
uint64_t bd = __emulu((uint32_t)ab, (uint32_t)cd);
uint64_t adbc = ad + __emulu((uint32_t)ab, (uint32_t)(cd >> 32));
uint64_t adbc_carry = !!(adbc < ad);
uint64_t lo = bd + (adbc << 32);
*hi = __emulu((uint32_t)(ab >> 32), (uint32_t)(cd >> 32)) + (adbc >> 32) +
(adbc_carry << 32) + !!(lo < bd);
return lo;
}
#endif
/** @private */
simdjson_inline internal::value128 full_multiplication(uint64_t value1, uint64_t value2) {
internal::value128 answer;
#if SIMDJSON_REGULAR_VISUAL_STUDIO || SIMDJSON_IS_32BITS
#ifdef _M_ARM64
// ARM64 has native support for 64-bit multiplications, no need to emultate
answer.high = __umulh(value1, value2);
answer.low = value1 * value2;
#else
answer.low = _umul128(value1, value2, &answer.high); // _umul128 not available on ARM64
#endif // _M_ARM64
#else // SIMDJSON_REGULAR_VISUAL_STUDIO || SIMDJSON_IS_32BITS
__uint128_t r = (static_cast<__uint128_t>(value1)) * value2;
answer.low = uint64_t(r);
answer.high = uint64_t(r >> 64);
#endif
return answer;
}
} // namespace numberparsing
} // namespace fallback
} // namespace simdjson
#define SIMDJSON_SWAR_NUMBER_PARSING 1
#endif // SIMDJSON_FALLBACK_NUMBERPARSING_DEFS_H
/* end file simdjson/fallback/numberparsing_defs.h */
/* end file simdjson/fallback/begin.h */
/* including simdjson/generic/amalgamated.h for fallback: #include "simdjson/generic/amalgamated.h" */
/* begin file simdjson/generic/amalgamated.h for fallback */
#if defined(SIMDJSON_CONDITIONAL_INCLUDE) && !defined(SIMDJSON_GENERIC_DEPENDENCIES_H)
#error simdjson/generic/dependencies.h must be included before simdjson/generic/amalgamated.h!
#endif
/* including simdjson/generic/base.h for fallback: #include "simdjson/generic/base.h" */
/* begin file simdjson/generic/base.h for fallback */
#ifndef SIMDJSON_GENERIC_BASE_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_GENERIC_BASE_H */
/* amalgamation skipped (editor-only): #include "simdjson/base.h" */
/* amalgamation skipped (editor-only): // If we haven't got an implementation yet, we're in the editor, editing a generic file! Just */
/* amalgamation skipped (editor-only): // use the most advanced one we can so the most possible stuff can be tested. */
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_IMPLEMENTATION */
/* amalgamation skipped (editor-only): #include "simdjson/implementation_detection.h" */
/* amalgamation skipped (editor-only): #if SIMDJSON_IMPLEMENTATION_ICELAKE */
/* amalgamation skipped (editor-only): #include "simdjson/icelake/begin.h" */
/* amalgamation skipped (editor-only): #elif SIMDJSON_IMPLEMENTATION_HASWELL */
/* amalgamation skipped (editor-only): #include "simdjson/haswell/begin.h" */
/* amalgamation skipped (editor-only): #elif SIMDJSON_IMPLEMENTATION_WESTMERE */
/* amalgamation skipped (editor-only): #include "simdjson/westmere/begin.h" */
/* amalgamation skipped (editor-only): #elif SIMDJSON_IMPLEMENTATION_ARM64 */
/* amalgamation skipped (editor-only): #include "simdjson/arm64/begin.h" */
/* amalgamation skipped (editor-only): #elif SIMDJSON_IMPLEMENTATION_PPC64 */
/* amalgamation skipped (editor-only): #include "simdjson/ppc64/begin.h" */
/* amalgamation skipped (editor-only): #elif SIMDJSON_IMPLEMENTATION_FALLBACK */
/* amalgamation skipped (editor-only): #include "simdjson/fallback/begin.h" */
/* amalgamation skipped (editor-only): #else */
/* amalgamation skipped (editor-only): #error "All possible implementations (including fallback) have been disabled! simdjson will not run." */
/* amalgamation skipped (editor-only): #endif */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_IMPLEMENTATION */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace fallback {
struct open_container;
class dom_parser_implementation;
/**
* The type of a JSON number
*/
enum class number_type {
floating_point_number=1, /// a binary64 number
signed_integer, /// a signed integer that fits in a 64-bit word using two's complement
unsigned_integer, /// a positive integer larger or equal to 1<<63
big_integer /// a big integer that does not fit in a 64-bit word
};
} // namespace fallback
} // namespace simdjson
#endif // SIMDJSON_GENERIC_BASE_H
/* end file simdjson/generic/base.h for fallback */
/* including simdjson/generic/jsoncharutils.h for fallback: #include "simdjson/generic/jsoncharutils.h" */
/* begin file simdjson/generic/jsoncharutils.h for fallback */
#ifndef SIMDJSON_GENERIC_JSONCHARUTILS_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_GENERIC_JSONCHARUTILS_H */
/* amalgamation skipped (editor-only): #include "simdjson/generic/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/jsoncharutils_tables.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/numberparsing_tables.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace fallback {
namespace {
namespace jsoncharutils {
// return non-zero if not a structural or whitespace char
// zero otherwise
simdjson_inline uint32_t is_not_structural_or_whitespace(uint8_t c) {
return internal::structural_or_whitespace_negated[c];
}
simdjson_inline uint32_t is_structural_or_whitespace(uint8_t c) {
return internal::structural_or_whitespace[c];
}
// returns a value with the high 16 bits set if not valid
// otherwise returns the conversion of the 4 hex digits at src into the bottom
// 16 bits of the 32-bit return register
//
// see
// https://lemire.me/blog/2019/04/17/parsing-short-hexadecimal-strings-efficiently/
static inline uint32_t hex_to_u32_nocheck(
const uint8_t *src) { // strictly speaking, static inline is a C-ism
uint32_t v1 = internal::digit_to_val32[630 + src[0]];
uint32_t v2 = internal::digit_to_val32[420 + src[1]];
uint32_t v3 = internal::digit_to_val32[210 + src[2]];
uint32_t v4 = internal::digit_to_val32[0 + src[3]];
return v1 | v2 | v3 | v4;
}
// given a code point cp, writes to c
// the utf-8 code, outputting the length in
// bytes, if the length is zero, the code point
// is invalid
//
// This can possibly be made faster using pdep
// and clz and table lookups, but JSON documents
// have few escaped code points, and the following
// function looks cheap.
//
// Note: we assume that surrogates are treated separately
//
simdjson_inline size_t codepoint_to_utf8(uint32_t cp, uint8_t *c) {
if (cp <= 0x7F) {
c[0] = uint8_t(cp);
return 1; // ascii
}
if (cp <= 0x7FF) {
c[0] = uint8_t((cp >> 6) + 192);
c[1] = uint8_t((cp & 63) + 128);
return 2; // universal plane
// Surrogates are treated elsewhere...
//} //else if (0xd800 <= cp && cp <= 0xdfff) {
// return 0; // surrogates // could put assert here
} else if (cp <= 0xFFFF) {
c[0] = uint8_t((cp >> 12) + 224);
c[1] = uint8_t(((cp >> 6) & 63) + 128);
c[2] = uint8_t((cp & 63) + 128);
return 3;
} else if (cp <= 0x10FFFF) { // if you know you have a valid code point, this
// is not needed
c[0] = uint8_t((cp >> 18) + 240);
c[1] = uint8_t(((cp >> 12) & 63) + 128);
c[2] = uint8_t(((cp >> 6) & 63) + 128);
c[3] = uint8_t((cp & 63) + 128);
return 4;
}
// will return 0 when the code point was too large.
return 0; // bad r
}
#if SIMDJSON_IS_32BITS // _umul128 for x86, arm
// this is a slow emulation routine for 32-bit
//
static simdjson_inline uint64_t __emulu(uint32_t x, uint32_t y) {
return x * (uint64_t)y;
}
static simdjson_inline uint64_t _umul128(uint64_t ab, uint64_t cd, uint64_t *hi) {
uint64_t ad = __emulu((uint32_t)(ab >> 32), (uint32_t)cd);
uint64_t bd = __emulu((uint32_t)ab, (uint32_t)cd);
uint64_t adbc = ad + __emulu((uint32_t)ab, (uint32_t)(cd >> 32));
uint64_t adbc_carry = !!(adbc < ad);
uint64_t lo = bd + (adbc << 32);
*hi = __emulu((uint32_t)(ab >> 32), (uint32_t)(cd >> 32)) + (adbc >> 32) +
(adbc_carry << 32) + !!(lo < bd);
return lo;
}
#endif
} // namespace jsoncharutils
} // unnamed namespace
} // namespace fallback
} // namespace simdjson
#endif // SIMDJSON_GENERIC_JSONCHARUTILS_H
/* end file simdjson/generic/jsoncharutils.h for fallback */
/* including simdjson/generic/atomparsing.h for fallback: #include "simdjson/generic/atomparsing.h" */
/* begin file simdjson/generic/atomparsing.h for fallback */
#ifndef SIMDJSON_GENERIC_ATOMPARSING_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_GENERIC_ATOMPARSING_H */
/* amalgamation skipped (editor-only): #include "simdjson/generic/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/generic/jsoncharutils.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#include <cstring>
namespace simdjson {
namespace fallback {
namespace {
/// @private
namespace atomparsing {
// The string_to_uint32 is exclusively used to map literal strings to 32-bit values.
// We use memcpy instead of a pointer cast to avoid undefined behaviors since we cannot
// be certain that the character pointer will be properly aligned.
// You might think that using memcpy makes this function expensive, but you'd be wrong.
// All decent optimizing compilers (GCC, clang, Visual Studio) will compile string_to_uint32("false");
// to the compile-time constant 1936482662.
simdjson_inline uint32_t string_to_uint32(const char* str) { uint32_t val; std::memcpy(&val, str, sizeof(uint32_t)); return val; }
// Again in str4ncmp we use a memcpy to avoid undefined behavior. The memcpy may appear expensive.
// Yet all decent optimizing compilers will compile memcpy to a single instruction, just about.
simdjson_warn_unused
simdjson_inline uint32_t str4ncmp(const uint8_t *src, const char* atom) {
uint32_t srcval; // we want to avoid unaligned 32-bit loads (undefined in C/C++)
static_assert(sizeof(uint32_t) <= SIMDJSON_PADDING, "SIMDJSON_PADDING must be larger than 4 bytes");
std::memcpy(&srcval, src, sizeof(uint32_t));
return srcval ^ string_to_uint32(atom);
}
simdjson_warn_unused
simdjson_inline bool is_valid_true_atom(const uint8_t *src) {
return (str4ncmp(src, "true") | jsoncharutils::is_not_structural_or_whitespace(src[4])) == 0;
}
simdjson_warn_unused
simdjson_inline bool is_valid_true_atom(const uint8_t *src, size_t len) {
if (len > 4) { return is_valid_true_atom(src); }
else if (len == 4) { return !str4ncmp(src, "true"); }
else { return false; }
}
simdjson_warn_unused
simdjson_inline bool is_valid_false_atom(const uint8_t *src) {
return (str4ncmp(src+1, "alse") | jsoncharutils::is_not_structural_or_whitespace(src[5])) == 0;
}
simdjson_warn_unused
simdjson_inline bool is_valid_false_atom(const uint8_t *src, size_t len) {
if (len > 5) { return is_valid_false_atom(src); }
else if (len == 5) { return !str4ncmp(src+1, "alse"); }
else { return false; }
}
simdjson_warn_unused
simdjson_inline bool is_valid_null_atom(const uint8_t *src) {
return (str4ncmp(src, "null") | jsoncharutils::is_not_structural_or_whitespace(src[4])) == 0;
}
simdjson_warn_unused
simdjson_inline bool is_valid_null_atom(const uint8_t *src, size_t len) {
if (len > 4) { return is_valid_null_atom(src); }
else if (len == 4) { return !str4ncmp(src, "null"); }
else { return false; }
}
} // namespace atomparsing
} // unnamed namespace
} // namespace fallback
} // namespace simdjson
#endif // SIMDJSON_GENERIC_ATOMPARSING_H
/* end file simdjson/generic/atomparsing.h for fallback */
/* including simdjson/generic/dom_parser_implementation.h for fallback: #include "simdjson/generic/dom_parser_implementation.h" */
/* begin file simdjson/generic/dom_parser_implementation.h for fallback */
#ifndef SIMDJSON_GENERIC_DOM_PARSER_IMPLEMENTATION_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_GENERIC_DOM_PARSER_IMPLEMENTATION_H */
/* amalgamation skipped (editor-only): #include "simdjson/generic/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/dom_parser_implementation.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace fallback {
// expectation: sizeof(open_container) = 64/8.
struct open_container {
uint32_t tape_index; // where, on the tape, does the scope ([,{) begins
uint32_t count; // how many elements in the scope
}; // struct open_container
static_assert(sizeof(open_container) == 64/8, "Open container must be 64 bits");
class dom_parser_implementation final : public internal::dom_parser_implementation {
public:
/** Tape location of each open { or [ */
std::unique_ptr<open_container[]> open_containers{};
/** Whether each open container is a [ or { */
std::unique_ptr<bool[]> is_array{};
/** Buffer passed to stage 1 */
const uint8_t *buf{};
/** Length passed to stage 1 */
size_t len{0};
/** Document passed to stage 2 */
dom::document *doc{};
inline dom_parser_implementation() noexcept;
inline dom_parser_implementation(dom_parser_implementation &&other) noexcept;
inline dom_parser_implementation &operator=(dom_parser_implementation &&other) noexcept;
dom_parser_implementation(const dom_parser_implementation &) = delete;
dom_parser_implementation &operator=(const dom_parser_implementation &) = delete;
simdjson_warn_unused error_code parse(const uint8_t *buf, size_t len, dom::document &doc) noexcept final;
simdjson_warn_unused error_code stage1(const uint8_t *buf, size_t len, stage1_mode partial) noexcept final;
simdjson_warn_unused error_code stage2(dom::document &doc) noexcept final;
simdjson_warn_unused error_code stage2_next(dom::document &doc) noexcept final;
simdjson_warn_unused uint8_t *parse_string(const uint8_t *src, uint8_t *dst, bool allow_replacement) const noexcept final;
simdjson_warn_unused uint8_t *parse_wobbly_string(const uint8_t *src, uint8_t *dst) const noexcept final;
inline simdjson_warn_unused error_code set_capacity(size_t capacity) noexcept final;
inline simdjson_warn_unused error_code set_max_depth(size_t max_depth) noexcept final;
private:
simdjson_inline simdjson_warn_unused error_code set_capacity_stage1(size_t capacity);
};
} // namespace fallback
} // namespace simdjson
namespace simdjson {
namespace fallback {
inline dom_parser_implementation::dom_parser_implementation() noexcept = default;
inline dom_parser_implementation::dom_parser_implementation(dom_parser_implementation &&other) noexcept = default;
inline dom_parser_implementation &dom_parser_implementation::operator=(dom_parser_implementation &&other) noexcept = default;
// Leaving these here so they can be inlined if so desired
inline simdjson_warn_unused error_code dom_parser_implementation::set_capacity(size_t capacity) noexcept {
if(capacity > SIMDJSON_MAXSIZE_BYTES) { return CAPACITY; }
// Stage 1 index output
size_t max_structures = SIMDJSON_ROUNDUP_N(capacity, 64) + 2 + 7;
structural_indexes.reset( new (std::nothrow) uint32_t[max_structures] );
if (!structural_indexes) { _capacity = 0; return MEMALLOC; }
structural_indexes[0] = 0;
n_structural_indexes = 0;
_capacity = capacity;
return SUCCESS;
}
inline simdjson_warn_unused error_code dom_parser_implementation::set_max_depth(size_t max_depth) noexcept {
// Stage 2 stacks
open_containers.reset(new (std::nothrow) open_container[max_depth]);
is_array.reset(new (std::nothrow) bool[max_depth]);
if (!is_array || !open_containers) { _max_depth = 0; return MEMALLOC; }
_max_depth = max_depth;
return SUCCESS;
}
} // namespace fallback
} // namespace simdjson
#endif // SIMDJSON_GENERIC_DOM_PARSER_IMPLEMENTATION_H
/* end file simdjson/generic/dom_parser_implementation.h for fallback */
/* including simdjson/generic/implementation_simdjson_result_base.h for fallback: #include "simdjson/generic/implementation_simdjson_result_base.h" */
/* begin file simdjson/generic/implementation_simdjson_result_base.h for fallback */
#ifndef SIMDJSON_GENERIC_IMPLEMENTATION_SIMDJSON_RESULT_BASE_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_GENERIC_IMPLEMENTATION_SIMDJSON_RESULT_BASE_H */
/* amalgamation skipped (editor-only): #include "simdjson/generic/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace fallback {
// This is a near copy of include/error.h's implementation_simdjson_result_base, except it doesn't use std::pair
// so we can avoid inlining errors
// TODO reconcile these!
/**
* The result of a simdjson operation that could fail.
*
* Gives the option of reading error codes, or throwing an exception by casting to the desired result.
*
* This is a base class for implementations that want to add functions to the result type for
* chaining.
*
* Override like:
*
* struct simdjson_result<T> : public internal::implementation_simdjson_result_base<T> {
* simdjson_result() noexcept : internal::implementation_simdjson_result_base<T>() {}
* simdjson_result(error_code error) noexcept : internal::implementation_simdjson_result_base<T>(error) {}
* simdjson_result(T &&value) noexcept : internal::implementation_simdjson_result_base<T>(std::forward(value)) {}
* simdjson_result(T &&value, error_code error) noexcept : internal::implementation_simdjson_result_base<T>(value, error) {}
* // Your extra methods here
* }
*
* Then any method returning simdjson_result<T> will be chainable with your methods.
*/
template<typename T>
struct implementation_simdjson_result_base {
/**
* Create a new empty result with error = UNINITIALIZED.
*/
simdjson_inline implementation_simdjson_result_base() noexcept = default;
/**
* Create a new error result.
*/
simdjson_inline implementation_simdjson_result_base(error_code error) noexcept;
/**
* Create a new successful result.
*/
simdjson_inline implementation_simdjson_result_base(T &&value) noexcept;
/**
* Create a new result with both things (use if you don't want to branch when creating the result).
*/
simdjson_inline implementation_simdjson_result_base(T &&value, error_code error) noexcept;
/**
* Move the value and the error to the provided variables.
*
* @param value The variable to assign the value to. May not be set if there is an error.
* @param error The variable to assign the error to. Set to SUCCESS if there is no error.
*/
simdjson_inline void tie(T &value, error_code &error) && noexcept;
/**
* Move the value to the provided variable.
*
* @param value The variable to assign the value to. May not be set if there is an error.
*/
simdjson_inline error_code get(T &value) && noexcept;
/**
* The error.
*/
simdjson_inline error_code error() const noexcept;
#if SIMDJSON_EXCEPTIONS
/**
* Get the result value.
*
* @throw simdjson_error if there was an error.
*/
simdjson_inline T& value() & noexcept(false);
/**
* Take the result value (move it).
*
* @throw simdjson_error if there was an error.
*/
simdjson_inline T&& value() && noexcept(false);
/**
* Take the result value (move it).
*
* @throw simdjson_error if there was an error.
*/
simdjson_inline T&& take_value() && noexcept(false);
/**
* Cast to the value (will throw on error).
*
* @throw simdjson_error if there was an error.
*/
simdjson_inline operator T&&() && noexcept(false);
#endif // SIMDJSON_EXCEPTIONS
/**
* Get the result value. This function is safe if and only
* the error() method returns a value that evaluates to false.
*/
simdjson_inline const T& value_unsafe() const& noexcept;
/**
* Get the result value. This function is safe if and only
* the error() method returns a value that evaluates to false.
*/
simdjson_inline T& value_unsafe() & noexcept;
/**
* Take the result value (move it). This function is safe if and only
* the error() method returns a value that evaluates to false.
*/
simdjson_inline T&& value_unsafe() && noexcept;
protected:
/** users should never directly access first and second. **/
T first{}; /** Users should never directly access 'first'. **/
error_code second{UNINITIALIZED}; /** Users should never directly access 'second'. **/
}; // struct implementation_simdjson_result_base
} // namespace fallback
} // namespace simdjson
#endif // SIMDJSON_GENERIC_IMPLEMENTATION_SIMDJSON_RESULT_BASE_H
/* end file simdjson/generic/implementation_simdjson_result_base.h for fallback */
/* including simdjson/generic/numberparsing.h for fallback: #include "simdjson/generic/numberparsing.h" */
/* begin file simdjson/generic/numberparsing.h for fallback */
#ifndef SIMDJSON_GENERIC_NUMBERPARSING_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_GENERIC_NUMBERPARSING_H */
/* amalgamation skipped (editor-only): #include "simdjson/generic/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/generic/jsoncharutils.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/numberparsing_tables.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#include <limits>
#include <ostream>
#include <cstring>
namespace simdjson {
namespace fallback {
namespace numberparsing {
#ifdef JSON_TEST_NUMBERS
#define INVALID_NUMBER(SRC) (found_invalid_number((SRC)), NUMBER_ERROR)
#define WRITE_INTEGER(VALUE, SRC, WRITER) (found_integer((VALUE), (SRC)), (WRITER).append_s64((VALUE)))
#define WRITE_UNSIGNED(VALUE, SRC, WRITER) (found_unsigned_integer((VALUE), (SRC)), (WRITER).append_u64((VALUE)))
#define WRITE_DOUBLE(VALUE, SRC, WRITER) (found_float((VALUE), (SRC)), (WRITER).append_double((VALUE)))
#define BIGINT_NUMBER(SRC) (found_invalid_number((SRC)), BIGINT_ERROR)
#else
#define INVALID_NUMBER(SRC) (NUMBER_ERROR)
#define WRITE_INTEGER(VALUE, SRC, WRITER) (WRITER).append_s64((VALUE))
#define WRITE_UNSIGNED(VALUE, SRC, WRITER) (WRITER).append_u64((VALUE))
#define WRITE_DOUBLE(VALUE, SRC, WRITER) (WRITER).append_double((VALUE))
#define BIGINT_NUMBER(SRC) (BIGINT_ERROR)
#endif
namespace {
// Convert a mantissa, an exponent and a sign bit into an ieee64 double.
// The real_exponent needs to be in [0, 2046] (technically real_exponent = 2047 would be acceptable).
// The mantissa should be in [0,1<<53). The bit at index (1ULL << 52) while be zeroed.
simdjson_inline double to_double(uint64_t mantissa, uint64_t real_exponent, bool negative) {
double d;
mantissa &= ~(1ULL << 52);
mantissa |= real_exponent << 52;
mantissa |= ((static_cast<uint64_t>(negative)) << 63);
std::memcpy(&d, &mantissa, sizeof(d));
return d;
}
// Attempts to compute i * 10^(power) exactly; and if "negative" is
// true, negate the result.
// This function will only work in some cases, when it does not work, success is
// set to false. This should work *most of the time* (like 99% of the time).
// We assume that power is in the [smallest_power,
// largest_power] interval: the caller is responsible for this check.
simdjson_inline bool compute_float_64(int64_t power, uint64_t i, bool negative, double &d) {
// we start with a fast path
// It was described in
// Clinger WD. How to read floating point numbers accurately.
// ACM SIGPLAN Notices. 1990
#ifndef FLT_EVAL_METHOD
#error "FLT_EVAL_METHOD should be defined, please include cfloat."
#endif
#if (FLT_EVAL_METHOD != 1) && (FLT_EVAL_METHOD != 0)
// We cannot be certain that x/y is rounded to nearest.
if (0 <= power && power <= 22 && i <= 9007199254740991)
#else
if (-22 <= power && power <= 22 && i <= 9007199254740991)
#endif
{
// convert the integer into a double. This is lossless since
// 0 <= i <= 2^53 - 1.
d = double(i);
//
// The general idea is as follows.
// If 0 <= s < 2^53 and if 10^0 <= p <= 10^22 then
// 1) Both s and p can be represented exactly as 64-bit floating-point
// values
// (binary64).
// 2) Because s and p can be represented exactly as floating-point values,
// then s * p
// and s / p will produce correctly rounded values.
//
if (power < 0) {
d = d / simdjson::internal::power_of_ten[-power];
} else {
d = d * simdjson::internal::power_of_ten[power];
}
if (negative) {
d = -d;
}
return true;
}
// When 22 < power && power < 22 + 16, we could
// hope for another, secondary fast path. It was
// described by David M. Gay in "Correctly rounded
// binary-decimal and decimal-binary conversions." (1990)
// If you need to compute i * 10^(22 + x) for x < 16,
// first compute i * 10^x, if you know that result is exact
// (e.g., when i * 10^x < 2^53),
// then you can still proceed and do (i * 10^x) * 10^22.
// Is this worth your time?
// You need 22 < power *and* power < 22 + 16 *and* (i * 10^(x-22) < 2^53)
// for this second fast path to work.
// If you you have 22 < power *and* power < 22 + 16, and then you
// optimistically compute "i * 10^(x-22)", there is still a chance that you
// have wasted your time if i * 10^(x-22) >= 2^53. It makes the use cases of
// this optimization maybe less common than we would like. Source:
// http://www.exploringbinary.com/fast-path-decimal-to-floating-point-conversion/
// also used in RapidJSON: https://rapidjson.org/strtod_8h_source.html
// The fast path has now failed, so we are failing back on the slower path.
// In the slow path, we need to adjust i so that it is > 1<<63 which is always
// possible, except if i == 0, so we handle i == 0 separately.
if(i == 0) {
d = negative ? -0.0 : 0.0;
return true;
}
// The exponent is 1024 + 63 + power
// + floor(log(5**power)/log(2)).
// The 1024 comes from the ieee64 standard.
// The 63 comes from the fact that we use a 64-bit word.
//
// Computing floor(log(5**power)/log(2)) could be
// slow. Instead we use a fast function.
//
// For power in (-400,350), we have that
// (((152170 + 65536) * power ) >> 16);
// is equal to
// floor(log(5**power)/log(2)) + power when power >= 0
// and it is equal to
// ceil(log(5**-power)/log(2)) + power when power < 0
//
// The 65536 is (1<<16) and corresponds to
// (65536 * power) >> 16 ---> power
//
// ((152170 * power ) >> 16) is equal to
// floor(log(5**power)/log(2))
//
// Note that this is not magic: 152170/(1<<16) is
// approximatively equal to log(5)/log(2).
// The 1<<16 value is a power of two; we could use a
// larger power of 2 if we wanted to.
//
int64_t exponent = (((152170 + 65536) * power) >> 16) + 1024 + 63;
// We want the most significant bit of i to be 1. Shift if needed.
int lz = leading_zeroes(i);
i <<= lz;
// We are going to need to do some 64-bit arithmetic to get a precise product.
// We use a table lookup approach.
// It is safe because
// power >= smallest_power
// and power <= largest_power
// We recover the mantissa of the power, it has a leading 1. It is always
// rounded down.
//
// We want the most significant 64 bits of the product. We know
// this will be non-zero because the most significant bit of i is
// 1.
const uint32_t index = 2 * uint32_t(power - simdjson::internal::smallest_power);
// Optimization: It may be that materializing the index as a variable might confuse some compilers and prevent effective complex-addressing loads. (Done for code clarity.)
//
// The full_multiplication function computes the 128-bit product of two 64-bit words
// with a returned value of type value128 with a "low component" corresponding to the
// 64-bit least significant bits of the product and with a "high component" corresponding
// to the 64-bit most significant bits of the product.
simdjson::internal::value128 firstproduct = full_multiplication(i, simdjson::internal::power_of_five_128[index]);
// Both i and power_of_five_128[index] have their most significant bit set to 1 which
// implies that the either the most or the second most significant bit of the product
// is 1. We pack values in this manner for efficiency reasons: it maximizes the use
// we make of the product. It also makes it easy to reason about the product: there
// is 0 or 1 leading zero in the product.
// Unless the least significant 9 bits of the high (64-bit) part of the full
// product are all 1s, then we know that the most significant 55 bits are
// exact and no further work is needed. Having 55 bits is necessary because
// we need 53 bits for the mantissa but we have to have one rounding bit and
// we can waste a bit if the most significant bit of the product is zero.
if((firstproduct.high & 0x1FF) == 0x1FF) {
// We want to compute i * 5^q, but only care about the top 55 bits at most.
// Consider the scenario where q>=0. Then 5^q may not fit in 64-bits. Doing
// the full computation is wasteful. So we do what is called a "truncated
// multiplication".
// We take the most significant 64-bits, and we put them in
// power_of_five_128[index]. Usually, that's good enough to approximate i * 5^q
// to the desired approximation using one multiplication. Sometimes it does not suffice.
// Then we store the next most significant 64 bits in power_of_five_128[index + 1], and
// then we get a better approximation to i * 5^q.
//
// That's for when q>=0. The logic for q<0 is somewhat similar but it is somewhat
// more complicated.
//
// There is an extra layer of complexity in that we need more than 55 bits of
// accuracy in the round-to-even scenario.
//
// The full_multiplication function computes the 128-bit product of two 64-bit words
// with a returned value of type value128 with a "low component" corresponding to the
// 64-bit least significant bits of the product and with a "high component" corresponding
// to the 64-bit most significant bits of the product.
simdjson::internal::value128 secondproduct = full_multiplication(i, simdjson::internal::power_of_five_128[index + 1]);
firstproduct.low += secondproduct.high;
if(secondproduct.high > firstproduct.low) { firstproduct.high++; }
// As it has been proven by Noble Mushtak and Daniel Lemire in "Fast Number Parsing Without
// Fallback" (https://arxiv.org/abs/2212.06644), at this point we are sure that the product
// is sufficiently accurate, and more computation is not needed.
}
uint64_t lower = firstproduct.low;
uint64_t upper = firstproduct.high;
// The final mantissa should be 53 bits with a leading 1.
// We shift it so that it occupies 54 bits with a leading 1.
///////
uint64_t upperbit = upper >> 63;
uint64_t mantissa = upper >> (upperbit + 9);
lz += int(1 ^ upperbit);
// Here we have mantissa < (1<<54).
int64_t real_exponent = exponent - lz;
if (simdjson_unlikely(real_exponent <= 0)) { // we have a subnormal?
// Here have that real_exponent <= 0 so -real_exponent >= 0
if(-real_exponent + 1 >= 64) { // if we have more than 64 bits below the minimum exponent, you have a zero for sure.
d = negative ? -0.0 : 0.0;
return true;
}
// next line is safe because -real_exponent + 1 < 0
mantissa >>= -real_exponent + 1;
// Thankfully, we can't have both "round-to-even" and subnormals because
// "round-to-even" only occurs for powers close to 0.
mantissa += (mantissa & 1); // round up
mantissa >>= 1;
// There is a weird scenario where we don't have a subnormal but just.
// Suppose we start with 2.2250738585072013e-308, we end up
// with 0x3fffffffffffff x 2^-1023-53 which is technically subnormal
// whereas 0x40000000000000 x 2^-1023-53 is normal. Now, we need to round
// up 0x3fffffffffffff x 2^-1023-53 and once we do, we are no longer
// subnormal, but we can only know this after rounding.
// So we only declare a subnormal if we are smaller than the threshold.
real_exponent = (mantissa < (uint64_t(1) << 52)) ? 0 : 1;
d = to_double(mantissa, real_exponent, negative);
return true;
}
// We have to round to even. The "to even" part
// is only a problem when we are right in between two floats
// which we guard against.
// If we have lots of trailing zeros, we may fall right between two
// floating-point values.
//
// The round-to-even cases take the form of a number 2m+1 which is in (2^53,2^54]
// times a power of two. That is, it is right between a number with binary significand
// m and another number with binary significand m+1; and it must be the case
// that it cannot be represented by a float itself.
//
// We must have that w * 10 ^q == (2m+1) * 2^p for some power of two 2^p.
// Recall that 10^q = 5^q * 2^q.
// When q >= 0, we must have that (2m+1) is divible by 5^q, so 5^q <= 2^54. We have that
// 5^23 <= 2^54 and it is the last power of five to qualify, so q <= 23.
// When q<0, we have w >= (2m+1) x 5^{-q}. We must have that w<2^{64} so
// (2m+1) x 5^{-q} < 2^{64}. We have that 2m+1>2^{53}. Hence, we must have
// 2^{53} x 5^{-q} < 2^{64}.
// Hence we have 5^{-q} < 2^{11}$ or q>= -4.
//
// We require lower <= 1 and not lower == 0 because we could not prove that
// that lower == 0 is implied; but we could prove that lower <= 1 is a necessary and sufficient test.
if (simdjson_unlikely((lower <= 1) && (power >= -4) && (power <= 23) && ((mantissa & 3) == 1))) {
if((mantissa << (upperbit + 64 - 53 - 2)) == upper) {
mantissa &= ~1; // flip it so that we do not round up
}
}
mantissa += mantissa & 1;
mantissa >>= 1;
// Here we have mantissa < (1<<53), unless there was an overflow
if (mantissa >= (1ULL << 53)) {
//////////
// This will happen when parsing values such as 7.2057594037927933e+16
////////
mantissa = (1ULL << 52);
real_exponent++;
}
mantissa &= ~(1ULL << 52);
// we have to check that real_exponent is in range, otherwise we bail out
if (simdjson_unlikely(real_exponent > 2046)) {
// We have an infinite value!!! We could actually throw an error here if we could.
return false;
}
d = to_double(mantissa, real_exponent, negative);
return true;
}
// We call a fallback floating-point parser that might be slow. Note
// it will accept JSON numbers, but the JSON spec. is more restrictive so
// before you call parse_float_fallback, you need to have validated the input
// string with the JSON grammar.
// It will return an error (false) if the parsed number is infinite.
// The string parsing itself always succeeds. We know that there is at least
// one digit.
static bool parse_float_fallback(const uint8_t *ptr, double *outDouble) {
*outDouble = simdjson::internal::from_chars(reinterpret_cast<const char *>(ptr));
// We do not accept infinite values.
// Detecting finite values in a portable manner is ridiculously hard, ideally
// we would want to do:
// return !std::isfinite(*outDouble);
// but that mysteriously fails under legacy/old libc++ libraries, see
// https://github.com/simdjson/simdjson/issues/1286
//
// Therefore, fall back to this solution (the extra parens are there
// to handle that max may be a macro on windows).
return !(*outDouble > (std::numeric_limits<double>::max)() || *outDouble < std::numeric_limits<double>::lowest());
}
static bool parse_float_fallback(const uint8_t *ptr, const uint8_t *end_ptr, double *outDouble) {
*outDouble = simdjson::internal::from_chars(reinterpret_cast<const char *>(ptr), reinterpret_cast<const char *>(end_ptr));
// We do not accept infinite values.
// Detecting finite values in a portable manner is ridiculously hard, ideally
// we would want to do:
// return !std::isfinite(*outDouble);
// but that mysteriously fails under legacy/old libc++ libraries, see
// https://github.com/simdjson/simdjson/issues/1286
//
// Therefore, fall back to this solution (the extra parens are there
// to handle that max may be a macro on windows).
return !(*outDouble > (std::numeric_limits<double>::max)() || *outDouble < std::numeric_limits<double>::lowest());
}
// check quickly whether the next 8 chars are made of digits
// at a glance, it looks better than Mula's
// http://0x80.pl/articles/swar-digits-validate.html
simdjson_inline bool is_made_of_eight_digits_fast(const uint8_t *chars) {
uint64_t val;
// this can read up to 7 bytes beyond the buffer size, but we require
// SIMDJSON_PADDING of padding
static_assert(7 <= SIMDJSON_PADDING, "SIMDJSON_PADDING must be bigger than 7");
std::memcpy(&val, chars, 8);
// a branchy method might be faster:
// return (( val & 0xF0F0F0F0F0F0F0F0 ) == 0x3030303030303030)
// && (( (val + 0x0606060606060606) & 0xF0F0F0F0F0F0F0F0 ) ==
// 0x3030303030303030);
return (((val & 0xF0F0F0F0F0F0F0F0) |
(((val + 0x0606060606060606) & 0xF0F0F0F0F0F0F0F0) >> 4)) ==
0x3333333333333333);
}
template<typename I>
SIMDJSON_NO_SANITIZE_UNDEFINED // We deliberately allow overflow here and check later
simdjson_inline bool parse_digit(const uint8_t c, I &i) {
const uint8_t digit = static_cast<uint8_t>(c - '0');
if (digit > 9) {
return false;
}
// PERF NOTE: multiplication by 10 is cheaper than arbitrary integer multiplication
i = 10 * i + digit; // might overflow, we will handle the overflow later
return true;
}
simdjson_inline bool is_digit(const uint8_t c) {
return static_cast<uint8_t>(c - '0') <= 9;
}
simdjson_inline error_code parse_decimal_after_separator(simdjson_unused const uint8_t *const src, const uint8_t *&p, uint64_t &i, int64_t &exponent) {
// we continue with the fiction that we have an integer. If the
// floating point number is representable as x * 10^z for some integer
// z that fits in 53 bits, then we will be able to convert back the
// the integer into a float in a lossless manner.
const uint8_t *const first_after_period = p;
#ifdef SIMDJSON_SWAR_NUMBER_PARSING
#if SIMDJSON_SWAR_NUMBER_PARSING
// this helps if we have lots of decimals!
// this turns out to be frequent enough.
if (is_made_of_eight_digits_fast(p)) {
i = i * 100000000 + parse_eight_digits_unrolled(p);
p += 8;
}
#endif // SIMDJSON_SWAR_NUMBER_PARSING
#endif // #ifdef SIMDJSON_SWAR_NUMBER_PARSING
// Unrolling the first digit makes a small difference on some implementations (e.g. westmere)
if (parse_digit(*p, i)) { ++p; }
while (parse_digit(*p, i)) { p++; }
exponent = first_after_period - p;
// Decimal without digits (123.) is illegal
if (exponent == 0) {
return INVALID_NUMBER(src);
}
return SUCCESS;
}
simdjson_inline error_code parse_exponent(simdjson_unused const uint8_t *const src, const uint8_t *&p, int64_t &exponent) {
// Exp Sign: -123.456e[-]78
bool neg_exp = ('-' == *p);
if (neg_exp || '+' == *p) { p++; } // Skip + as well
// Exponent: -123.456e-[78]
auto start_exp = p;
int64_t exp_number = 0;
while (parse_digit(*p, exp_number)) { ++p; }
// It is possible for parse_digit to overflow.
// In particular, it could overflow to INT64_MIN, and we cannot do - INT64_MIN.
// Thus we *must* check for possible overflow before we negate exp_number.
// Performance notes: it may seem like combining the two "simdjson_unlikely checks" below into
// a single simdjson_unlikely path would be faster. The reasoning is sound, but the compiler may
// not oblige and may, in fact, generate two distinct paths in any case. It might be
// possible to do uint64_t(p - start_exp - 1) >= 18 but it could end up trading off
// instructions for a simdjson_likely branch, an unconclusive gain.
// If there were no digits, it's an error.
if (simdjson_unlikely(p == start_exp)) {
return INVALID_NUMBER(src);
}
// We have a valid positive exponent in exp_number at this point, except that
// it may have overflowed.
// If there were more than 18 digits, we may have overflowed the integer. We have to do
// something!!!!
if (simdjson_unlikely(p > start_exp+18)) {
// Skip leading zeroes: 1e000000000000000000001 is technically valid and does not overflow
while (*start_exp == '0') { start_exp++; }
// 19 digits could overflow int64_t and is kind of absurd anyway. We don't
// support exponents smaller than -999,999,999,999,999,999 and bigger
// than 999,999,999,999,999,999.
// We can truncate.
// Note that 999999999999999999 is assuredly too large. The maximal ieee64 value before
// infinity is ~1.8e308. The smallest subnormal is ~5e-324. So, actually, we could
// truncate at 324.
// Note that there is no reason to fail per se at this point in time.
// E.g., 0e999999999999999999999 is a fine number.
if (p > start_exp+18) { exp_number = 999999999999999999; }
}
// At this point, we know that exp_number is a sane, positive, signed integer.
// It is <= 999,999,999,999,999,999. As long as 'exponent' is in
// [-8223372036854775808, 8223372036854775808], we won't overflow. Because 'exponent'
// is bounded in magnitude by the size of the JSON input, we are fine in this universe.
// To sum it up: the next line should never overflow.
exponent += (neg_exp ? -exp_number : exp_number);
return SUCCESS;
}
simdjson_inline bool check_if_integer(const uint8_t *const src, size_t max_length) {
const uint8_t *const srcend = src + max_length;
bool negative = (*src == '-'); // we can always read at least one character after the '-'
const uint8_t *p = src + uint8_t(negative);
if(p == srcend) { return false; }
if(*p == '0') {
++p;
if(p == srcend) { return true; }
if(jsoncharutils::is_not_structural_or_whitespace(*p)) { return false; }
return true;
}
while(p != srcend && is_digit(*p)) { ++p; }
if(p == srcend) { return true; }
if(jsoncharutils::is_not_structural_or_whitespace(*p)) { return false; }
return true;
}
simdjson_inline size_t significant_digits(const uint8_t * start_digits, size_t digit_count) {
// It is possible that the integer had an overflow.
// We have to handle the case where we have 0.0000somenumber.
const uint8_t *start = start_digits;
while ((*start == '0') || (*start == '.')) { ++start; }
// we over-decrement by one when there is a '.'
return digit_count - size_t(start - start_digits);
}
} // unnamed namespace
/** @private */
static error_code slow_float_parsing(simdjson_unused const uint8_t * src, double* answer) {
if (parse_float_fallback(src, answer)) {
return SUCCESS;
}
return INVALID_NUMBER(src);
}
/** @private */
template<typename W>
simdjson_inline error_code write_float(const uint8_t *const src, bool negative, uint64_t i, const uint8_t * start_digits, size_t digit_count, int64_t exponent, W &writer) {
// If we frequently had to deal with long strings of digits,
// we could extend our code by using a 128-bit integer instead
// of a 64-bit integer. However, this is uncommon in practice.
//
// 9999999999999999999 < 2**64 so we can accommodate 19 digits.
// If we have a decimal separator, then digit_count - 1 is the number of digits, but we
// may not have a decimal separator!
if (simdjson_unlikely(digit_count > 19 && significant_digits(start_digits, digit_count) > 19)) {
// Ok, chances are good that we had an overflow!
// this is almost never going to get called!!!
// we start anew, going slowly!!!
// This will happen in the following examples:
// 10000000000000000000000000000000000000000000e+308
// 3.1415926535897932384626433832795028841971693993751
//
// NOTE: We do not pass a reference to the to slow_float_parsing. If we passed our writer
// reference to it, it would force it to be stored in memory, preventing the compiler from
// picking it apart and putting into registers. i.e. if we pass it as reference,
// it gets slow.
double d;
error_code error = slow_float_parsing(src, &d);
writer.append_double(d);
return error;
}
// NOTE: it's weird that the simdjson_unlikely() only wraps half the if, but it seems to get slower any other
// way we've tried: https://github.com/simdjson/simdjson/pull/990#discussion_r448497331
// To future reader: we'd love if someone found a better way, or at least could explain this result!
if (simdjson_unlikely(exponent < simdjson::internal::smallest_power) || (exponent > simdjson::internal::largest_power)) {
//
// Important: smallest_power is such that it leads to a zero value.
// Observe that 18446744073709551615e-343 == 0, i.e. (2**64 - 1) e -343 is zero
// so something x 10^-343 goes to zero, but not so with something x 10^-342.
static_assert(simdjson::internal::smallest_power <= -342, "smallest_power is not small enough");
//
if((exponent < simdjson::internal::smallest_power) || (i == 0)) {
// E.g. Parse "-0.0e-999" into the same value as "-0.0". See https://en.wikipedia.org/wiki/Signed_zero
WRITE_DOUBLE(negative ? -0.0 : 0.0, src, writer);
return SUCCESS;
} else { // (exponent > largest_power) and (i != 0)
// We have, for sure, an infinite value and simdjson refuses to parse infinite values.
return INVALID_NUMBER(src);
}
}
double d;
if (!compute_float_64(exponent, i, negative, d)) {
// we are almost never going to get here.
if (!parse_float_fallback(src, &d)) { return INVALID_NUMBER(src); }
}
WRITE_DOUBLE(d, src, writer);
return SUCCESS;
}
// parse the number at src
// define JSON_TEST_NUMBERS for unit testing
//
// It is assumed that the number is followed by a structural ({,},],[) character
// or a white space character. If that is not the case (e.g., when the JSON
// document is made of a single number), then it is necessary to copy the
// content and append a space before calling this function.
//
// Our objective is accurate parsing (ULP of 0) at high speed.
template<typename W>
simdjson_inline error_code parse_number(const uint8_t *const src, W &writer);
// for performance analysis, it is sometimes useful to skip parsing
#ifdef SIMDJSON_SKIPNUMBERPARSING
template<typename W>
simdjson_inline error_code parse_number(const uint8_t *const, W &writer) {
writer.append_s64(0); // always write zero
return SUCCESS; // always succeeds
}
simdjson_unused simdjson_inline simdjson_result<uint64_t> parse_unsigned(const uint8_t * const src) noexcept { return 0; }
simdjson_unused simdjson_inline simdjson_result<int64_t> parse_integer(const uint8_t * const src) noexcept { return 0; }
simdjson_unused simdjson_inline simdjson_result<double> parse_double(const uint8_t * const src) noexcept { return 0; }
simdjson_unused simdjson_inline simdjson_result<uint64_t> parse_unsigned_in_string(const uint8_t * const src) noexcept { return 0; }
simdjson_unused simdjson_inline simdjson_result<int64_t> parse_integer_in_string(const uint8_t * const src) noexcept { return 0; }
simdjson_unused simdjson_inline simdjson_result<double> parse_double_in_string(const uint8_t * const src) noexcept { return 0; }
simdjson_unused simdjson_inline bool is_negative(const uint8_t * src) noexcept { return false; }
simdjson_unused simdjson_inline simdjson_result<bool> is_integer(const uint8_t * src) noexcept { return false; }
simdjson_unused simdjson_inline simdjson_result<number_type> get_number_type(const uint8_t * src) noexcept { return number_type::signed_integer; }
#else
// parse the number at src
// define JSON_TEST_NUMBERS for unit testing
//
// It is assumed that the number is followed by a structural ({,},],[) character
// or a white space character. If that is not the case (e.g., when the JSON
// document is made of a single number), then it is necessary to copy the
// content and append a space before calling this function.
//
// Our objective is accurate parsing (ULP of 0) at high speed.
template<typename W>
simdjson_inline error_code parse_number(const uint8_t *const src, W &writer) {
//
// Check for minus sign
//
bool negative = (*src == '-');
const uint8_t *p = src + uint8_t(negative);
//
// Parse the integer part.
//
// PERF NOTE: we don't use is_made_of_eight_digits_fast because large integers like 123456789 are rare
const uint8_t *const start_digits = p;
uint64_t i = 0;
while (parse_digit(*p, i)) { p++; }
// If there were no digits, or if the integer starts with 0 and has more than one digit, it's an error.
// Optimization note: size_t is expected to be unsigned.
size_t digit_count = size_t(p - start_digits);
if (digit_count == 0 || ('0' == *start_digits && digit_count > 1)) { return INVALID_NUMBER(src); }
//
// Handle floats if there is a . or e (or both)
//
int64_t exponent = 0;
bool is_float = false;
if ('.' == *p) {
is_float = true;
++p;
SIMDJSON_TRY( parse_decimal_after_separator(src, p, i, exponent) );
digit_count = int(p - start_digits); // used later to guard against overflows
}
if (('e' == *p) || ('E' == *p)) {
is_float = true;
++p;
SIMDJSON_TRY( parse_exponent(src, p, exponent) );
}
if (is_float) {
const bool dirty_end = jsoncharutils::is_not_structural_or_whitespace(*p);
SIMDJSON_TRY( write_float(src, negative, i, start_digits, digit_count, exponent, writer) );
if (dirty_end) { return INVALID_NUMBER(src); }
return SUCCESS;
}
// The longest negative 64-bit number is 19 digits.
// The longest positive 64-bit number is 20 digits.
// We do it this way so we don't trigger this branch unless we must.
size_t longest_digit_count = negative ? 19 : 20;
if (digit_count > longest_digit_count) { return BIGINT_NUMBER(src); }
if (digit_count == longest_digit_count) {
if (negative) {
// Anything negative above INT64_MAX+1 is invalid
if (i > uint64_t(INT64_MAX)+1) { return BIGINT_NUMBER(src); }
WRITE_INTEGER(~i+1, src, writer);
if (jsoncharutils::is_not_structural_or_whitespace(*p)) { return INVALID_NUMBER(src); }
return SUCCESS;
// Positive overflow check:
// - A 20 digit number starting with 2-9 is overflow, because 18,446,744,073,709,551,615 is the
// biggest uint64_t.
// - A 20 digit number starting with 1 is overflow if it is less than INT64_MAX.
// If we got here, it's a 20 digit number starting with the digit "1".
// - If a 20 digit number starting with 1 overflowed (i*10+digit), the result will be smaller
// than 1,553,255,926,290,448,384.
// - That is smaller than the smallest possible 20-digit number the user could write:
// 10,000,000,000,000,000,000.
// - Therefore, if the number is positive and lower than that, it's overflow.
// - The value we are looking at is less than or equal to INT64_MAX.
//
} else if (src[0] != uint8_t('1') || i <= uint64_t(INT64_MAX)) { return INVALID_NUMBER(src); }
}
// Write unsigned if it does not fit in a signed integer.
if (i > uint64_t(INT64_MAX)) {
WRITE_UNSIGNED(i, src, writer);
} else {
WRITE_INTEGER(negative ? (~i+1) : i, src, writer);
}
if (jsoncharutils::is_not_structural_or_whitespace(*p)) { return INVALID_NUMBER(src); }
return SUCCESS;
}
// Inlineable functions
namespace {
// This table can be used to characterize the final character of an integer
// string. For JSON structural character and allowable white space characters,
// we return SUCCESS. For 'e', '.' and 'E', we return INCORRECT_TYPE. Otherwise
// we return NUMBER_ERROR.
// Optimization note: we could easily reduce the size of the table by half (to 128)
// at the cost of an extra branch.
// Optimization note: we want the values to use at most 8 bits (not, e.g., 32 bits):
static_assert(error_code(uint8_t(NUMBER_ERROR))== NUMBER_ERROR, "bad NUMBER_ERROR cast");
static_assert(error_code(uint8_t(SUCCESS))== SUCCESS, "bad NUMBER_ERROR cast");
static_assert(error_code(uint8_t(INCORRECT_TYPE))== INCORRECT_TYPE, "bad NUMBER_ERROR cast");
const uint8_t integer_string_finisher[256] = {
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, SUCCESS,
SUCCESS, NUMBER_ERROR, NUMBER_ERROR, SUCCESS, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, SUCCESS, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, SUCCESS,
NUMBER_ERROR, INCORRECT_TYPE, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, SUCCESS, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, INCORRECT_TYPE,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, SUCCESS, NUMBER_ERROR, SUCCESS, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, INCORRECT_TYPE, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, SUCCESS, NUMBER_ERROR,
SUCCESS, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR, NUMBER_ERROR,
NUMBER_ERROR};
// Parse any number from 0 to 18,446,744,073,709,551,615
simdjson_unused simdjson_inline simdjson_result<uint64_t> parse_unsigned(const uint8_t * const src) noexcept {
const uint8_t *p = src;
//
// Parse the integer part.
//
// PERF NOTE: we don't use is_made_of_eight_digits_fast because large integers like 123456789 are rare
const uint8_t *const start_digits = p;
uint64_t i = 0;
while (parse_digit(*p, i)) { p++; }
// If there were no digits, or if the integer starts with 0 and has more than one digit, it's an error.
// Optimization note: size_t is expected to be unsigned.
size_t digit_count = size_t(p - start_digits);
// The longest positive 64-bit number is 20 digits.
// We do it this way so we don't trigger this branch unless we must.
// Optimization note: the compiler can probably merge
// ((digit_count == 0) || (digit_count > 20))
// into a single branch since digit_count is unsigned.
if ((digit_count == 0) || (digit_count > 20)) { return INCORRECT_TYPE; }
// Here digit_count > 0.
if (('0' == *start_digits) && (digit_count > 1)) { return NUMBER_ERROR; }
// We can do the following...
// if (!jsoncharutils::is_structural_or_whitespace(*p)) {
// return (*p == '.' || *p == 'e' || *p == 'E') ? INCORRECT_TYPE : NUMBER_ERROR;
// }
// as a single table lookup:
if (integer_string_finisher[*p] != SUCCESS) { return error_code(integer_string_finisher[*p]); }
if (digit_count == 20) {
// Positive overflow check:
// - A 20 digit number starting with 2-9 is overflow, because 18,446,744,073,709,551,615 is the
// biggest uint64_t.
// - A 20 digit number starting with 1 is overflow if it is less than INT64_MAX.
// If we got here, it's a 20 digit number starting with the digit "1".
// - If a 20 digit number starting with 1 overflowed (i*10+digit), the result will be smaller
// than 1,553,255,926,290,448,384.
// - That is smaller than the smallest possible 20-digit number the user could write:
// 10,000,000,000,000,000,000.
// - Therefore, if the number is positive and lower than that, it's overflow.
// - The value we are looking at is less than or equal to INT64_MAX.
//
if (src[0] != uint8_t('1') || i <= uint64_t(INT64_MAX)) { return INCORRECT_TYPE; }
}
return i;
}
// Parse any number from 0 to 18,446,744,073,709,551,615
// Never read at src_end or beyond
simdjson_unused simdjson_inline simdjson_result<uint64_t> parse_unsigned(const uint8_t * const src, const uint8_t * const src_end) noexcept {
const uint8_t *p = src;
//
// Parse the integer part.
//
// PERF NOTE: we don't use is_made_of_eight_digits_fast because large integers like 123456789 are rare
const uint8_t *const start_digits = p;
uint64_t i = 0;
while ((p != src_end) && parse_digit(*p, i)) { p++; }
// If there were no digits, or if the integer starts with 0 and has more than one digit, it's an error.
// Optimization note: size_t is expected to be unsigned.
size_t digit_count = size_t(p - start_digits);
// The longest positive 64-bit number is 20 digits.
// We do it this way so we don't trigger this branch unless we must.
// Optimization note: the compiler can probably merge
// ((digit_count == 0) || (digit_count > 20))
// into a single branch since digit_count is unsigned.
if ((digit_count == 0) || (digit_count > 20)) { return INCORRECT_TYPE; }
// Here digit_count > 0.
if (('0' == *start_digits) && (digit_count > 1)) { return NUMBER_ERROR; }
// We can do the following...
// if (!jsoncharutils::is_structural_or_whitespace(*p)) {
// return (*p == '.' || *p == 'e' || *p == 'E') ? INCORRECT_TYPE : NUMBER_ERROR;
// }
// as a single table lookup:
if ((p != src_end) && integer_string_finisher[*p] != SUCCESS) { return error_code(integer_string_finisher[*p]); }
if (digit_count == 20) {
// Positive overflow check:
// - A 20 digit number starting with 2-9 is overflow, because 18,446,744,073,709,551,615 is the
// biggest uint64_t.
// - A 20 digit number starting with 1 is overflow if it is less than INT64_MAX.
// If we got here, it's a 20 digit number starting with the digit "1".
// - If a 20 digit number starting with 1 overflowed (i*10+digit), the result will be smaller
// than 1,553,255,926,290,448,384.
// - That is smaller than the smallest possible 20-digit number the user could write:
// 10,000,000,000,000,000,000.
// - Therefore, if the number is positive and lower than that, it's overflow.
// - The value we are looking at is less than or equal to INT64_MAX.
//
if (src[0] != uint8_t('1') || i <= uint64_t(INT64_MAX)) { return INCORRECT_TYPE; }
}
return i;
}
// Parse any number from 0 to 18,446,744,073,709,551,615
simdjson_unused simdjson_inline simdjson_result<uint64_t> parse_unsigned_in_string(const uint8_t * const src) noexcept {
const uint8_t *p = src + 1;
//
// Parse the integer part.
//
// PERF NOTE: we don't use is_made_of_eight_digits_fast because large integers like 123456789 are rare
const uint8_t *const start_digits = p;
uint64_t i = 0;
while (parse_digit(*p, i)) { p++; }
// If there were no digits, or if the integer starts with 0 and has more than one digit, it's an error.
// Optimization note: size_t is expected to be unsigned.
size_t digit_count = size_t(p - start_digits);
// The longest positive 64-bit number is 20 digits.
// We do it this way so we don't trigger this branch unless we must.
// Optimization note: the compiler can probably merge
// ((digit_count == 0) || (digit_count > 20))
// into a single branch since digit_count is unsigned.
if ((digit_count == 0) || (digit_count > 20)) { return INCORRECT_TYPE; }
// Here digit_count > 0.
if (('0' == *start_digits) && (digit_count > 1)) { return NUMBER_ERROR; }
// We can do the following...
// if (!jsoncharutils::is_structural_or_whitespace(*p)) {
// return (*p == '.' || *p == 'e' || *p == 'E') ? INCORRECT_TYPE : NUMBER_ERROR;
// }
// as a single table lookup:
if (*p != '"') { return NUMBER_ERROR; }
if (digit_count == 20) {
// Positive overflow check:
// - A 20 digit number starting with 2-9 is overflow, because 18,446,744,073,709,551,615 is the
// biggest uint64_t.
// - A 20 digit number starting with 1 is overflow if it is less than INT64_MAX.
// If we got here, it's a 20 digit number starting with the digit "1".
// - If a 20 digit number starting with 1 overflowed (i*10+digit), the result will be smaller
// than 1,553,255,926,290,448,384.
// - That is smaller than the smallest possible 20-digit number the user could write:
// 10,000,000,000,000,000,000.
// - Therefore, if the number is positive and lower than that, it's overflow.
// - The value we are looking at is less than or equal to INT64_MAX.
//
// Note: we use src[1] and not src[0] because src[0] is the quote character in this
// instance.
if (src[1] != uint8_t('1') || i <= uint64_t(INT64_MAX)) { return INCORRECT_TYPE; }
}
return i;
}
// Parse any number from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
simdjson_unused simdjson_inline simdjson_result<int64_t> parse_integer(const uint8_t *src) noexcept {
//
// Check for minus sign
//
bool negative = (*src == '-');
const uint8_t *p = src + uint8_t(negative);
//
// Parse the integer part.
//
// PERF NOTE: we don't use is_made_of_eight_digits_fast because large integers like 123456789 are rare
const uint8_t *const start_digits = p;
uint64_t i = 0;
while (parse_digit(*p, i)) { p++; }
// If there were no digits, or if the integer starts with 0 and has more than one digit, it's an error.
// Optimization note: size_t is expected to be unsigned.
size_t digit_count = size_t(p - start_digits);
// We go from
// -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
// so we can never represent numbers that have more than 19 digits.
size_t longest_digit_count = 19;
// Optimization note: the compiler can probably merge
// ((digit_count == 0) || (digit_count > longest_digit_count))
// into a single branch since digit_count is unsigned.
if ((digit_count == 0) || (digit_count > longest_digit_count)) { return INCORRECT_TYPE; }
// Here digit_count > 0.
if (('0' == *start_digits) && (digit_count > 1)) { return NUMBER_ERROR; }
// We can do the following...
// if (!jsoncharutils::is_structural_or_whitespace(*p)) {
// return (*p == '.' || *p == 'e' || *p == 'E') ? INCORRECT_TYPE : NUMBER_ERROR;
// }
// as a single table lookup:
if(integer_string_finisher[*p] != SUCCESS) { return error_code(integer_string_finisher[*p]); }
// Negative numbers have can go down to - INT64_MAX - 1 whereas positive numbers are limited to INT64_MAX.
// Performance note: This check is only needed when digit_count == longest_digit_count but it is
// so cheap that we might as well always make it.
if(i > uint64_t(INT64_MAX) + uint64_t(negative)) { return INCORRECT_TYPE; }
return negative ? (~i+1) : i;
}
// Parse any number from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
// Never read at src_end or beyond
simdjson_unused simdjson_inline simdjson_result<int64_t> parse_integer(const uint8_t * const src, const uint8_t * const src_end) noexcept {
//
// Check for minus sign
//
if(src == src_end) { return NUMBER_ERROR; }
bool negative = (*src == '-');
const uint8_t *p = src + uint8_t(negative);
//
// Parse the integer part.
//
// PERF NOTE: we don't use is_made_of_eight_digits_fast because large integers like 123456789 are rare
const uint8_t *const start_digits = p;
uint64_t i = 0;
while ((p != src_end) && parse_digit(*p, i)) { p++; }
// If there were no digits, or if the integer starts with 0 and has more than one digit, it's an error.
// Optimization note: size_t is expected to be unsigned.
size_t digit_count = size_t(p - start_digits);
// We go from
// -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
// so we can never represent numbers that have more than 19 digits.
size_t longest_digit_count = 19;
// Optimization note: the compiler can probably merge
// ((digit_count == 0) || (digit_count > longest_digit_count))
// into a single branch since digit_count is unsigned.
if ((digit_count == 0) || (digit_count > longest_digit_count)) { return INCORRECT_TYPE; }
// Here digit_count > 0.
if (('0' == *start_digits) && (digit_count > 1)) { return NUMBER_ERROR; }
// We can do the following...
// if (!jsoncharutils::is_structural_or_whitespace(*p)) {
// return (*p == '.' || *p == 'e' || *p == 'E') ? INCORRECT_TYPE : NUMBER_ERROR;
// }
// as a single table lookup:
if((p != src_end) && integer_string_finisher[*p] != SUCCESS) { return error_code(integer_string_finisher[*p]); }
// Negative numbers have can go down to - INT64_MAX - 1 whereas positive numbers are limited to INT64_MAX.
// Performance note: This check is only needed when digit_count == longest_digit_count but it is
// so cheap that we might as well always make it.
if(i > uint64_t(INT64_MAX) + uint64_t(negative)) { return INCORRECT_TYPE; }
return negative ? (~i+1) : i;
}
// Parse any number from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
simdjson_unused simdjson_inline simdjson_result<int64_t> parse_integer_in_string(const uint8_t *src) noexcept {
//
// Check for minus sign
//
bool negative = (*(src + 1) == '-');
src += uint8_t(negative) + 1;
//
// Parse the integer part.
//
// PERF NOTE: we don't use is_made_of_eight_digits_fast because large integers like 123456789 are rare
const uint8_t *const start_digits = src;
uint64_t i = 0;
while (parse_digit(*src, i)) { src++; }
// If there were no digits, or if the integer starts with 0 and has more than one digit, it's an error.
// Optimization note: size_t is expected to be unsigned.
size_t digit_count = size_t(src - start_digits);
// We go from
// -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
// so we can never represent numbers that have more than 19 digits.
size_t longest_digit_count = 19;
// Optimization note: the compiler can probably merge
// ((digit_count == 0) || (digit_count > longest_digit_count))
// into a single branch since digit_count is unsigned.
if ((digit_count == 0) || (digit_count > longest_digit_count)) { return INCORRECT_TYPE; }
// Here digit_count > 0.
if (('0' == *start_digits) && (digit_count > 1)) { return NUMBER_ERROR; }
// We can do the following...
// if (!jsoncharutils::is_structural_or_whitespace(*src)) {
// return (*src == '.' || *src == 'e' || *src == 'E') ? INCORRECT_TYPE : NUMBER_ERROR;
// }
// as a single table lookup:
if(*src != '"') { return NUMBER_ERROR; }
// Negative numbers have can go down to - INT64_MAX - 1 whereas positive numbers are limited to INT64_MAX.
// Performance note: This check is only needed when digit_count == longest_digit_count but it is
// so cheap that we might as well always make it.
if(i > uint64_t(INT64_MAX) + uint64_t(negative)) { return INCORRECT_TYPE; }
return negative ? (~i+1) : i;
}
simdjson_unused simdjson_inline simdjson_result<double> parse_double(const uint8_t * src) noexcept {
//
// Check for minus sign
//
bool negative = (*src == '-');
src += uint8_t(negative);
//
// Parse the integer part.
//
uint64_t i = 0;
const uint8_t *p = src;
p += parse_digit(*p, i);
bool leading_zero = (i == 0);
while (parse_digit(*p, i)) { p++; }
// no integer digits, or 0123 (zero must be solo)
if ( p == src ) { return INCORRECT_TYPE; }
if ( (leading_zero && p != src+1)) { return NUMBER_ERROR; }
//
// Parse the decimal part.
//
int64_t exponent = 0;
bool overflow;
if (simdjson_likely(*p == '.')) {
p++;
const uint8_t *start_decimal_digits = p;
if (!parse_digit(*p, i)) { return NUMBER_ERROR; } // no decimal digits
p++;
while (parse_digit(*p, i)) { p++; }
exponent = -(p - start_decimal_digits);
// Overflow check. More than 19 digits (minus the decimal) may be overflow.
overflow = p-src-1 > 19;
if (simdjson_unlikely(overflow && leading_zero)) {
// Skip leading 0.00000 and see if it still overflows
const uint8_t *start_digits = src + 2;
while (*start_digits == '0') { start_digits++; }
overflow = p-start_digits > 19;
}
} else {
overflow = p-src > 19;
}
//
// Parse the exponent
//
if (*p == 'e' || *p == 'E') {
p++;
bool exp_neg = *p == '-';
p += exp_neg || *p == '+';
uint64_t exp = 0;
const uint8_t *start_exp_digits = p;
while (parse_digit(*p, exp)) { p++; }
// no exp digits, or 20+ exp digits
if (p-start_exp_digits == 0 || p-start_exp_digits > 19) { return NUMBER_ERROR; }
exponent += exp_neg ? 0-exp : exp;
}
if (jsoncharutils::is_not_structural_or_whitespace(*p)) { return NUMBER_ERROR; }
overflow = overflow || exponent < simdjson::internal::smallest_power || exponent > simdjson::internal::largest_power;
//
// Assemble (or slow-parse) the float
//
double d;
if (simdjson_likely(!overflow)) {
if (compute_float_64(exponent, i, negative, d)) { return d; }
}
if (!parse_float_fallback(src - uint8_t(negative), &d)) {
return NUMBER_ERROR;
}
return d;
}
simdjson_unused simdjson_inline bool is_negative(const uint8_t * src) noexcept {
return (*src == '-');
}
simdjson_unused simdjson_inline simdjson_result<bool> is_integer(const uint8_t * src) noexcept {
bool negative = (*src == '-');
src += uint8_t(negative);
const uint8_t *p = src;
while(static_cast<uint8_t>(*p - '0') <= 9) { p++; }
if ( p == src ) { return NUMBER_ERROR; }
if (jsoncharutils::is_structural_or_whitespace(*p)) { return true; }
return false;
}
simdjson_unused simdjson_inline simdjson_result<number_type> get_number_type(const uint8_t * src) noexcept {
bool negative = (*src == '-');
src += uint8_t(negative);
const uint8_t *p = src;
while(static_cast<uint8_t>(*p - '0') <= 9) { p++; }
size_t digit_count = size_t(p - src);
if ( p == src ) { return NUMBER_ERROR; }
if (jsoncharutils::is_structural_or_whitespace(*p)) {
static const uint8_t * smaller_big_integer = reinterpret_cast<const uint8_t *>("9223372036854775808");
// We have an integer.
if(simdjson_unlikely(digit_count > 20)) {
return number_type::big_integer;
}
// If the number is negative and valid, it must be a signed integer.
if(negative) {
if (simdjson_unlikely(digit_count > 19)) return number_type::big_integer;
if (simdjson_unlikely(digit_count == 19 && memcmp(src, smaller_big_integer, 19) > 0)) {
return number_type::big_integer;
}
return number_type::signed_integer;
}
// Let us check if we have a big integer (>=2**64).
static const uint8_t * two_to_sixtyfour = reinterpret_cast<const uint8_t *>("18446744073709551616");
if((digit_count > 20) || (digit_count == 20 && memcmp(src, two_to_sixtyfour, 20) >= 0)) {
return number_type::big_integer;
}
// The number is positive and smaller than 18446744073709551616 (or 2**64).
// We want values larger or equal to 9223372036854775808 to be unsigned
// integers, and the other values to be signed integers.
if((digit_count == 20) || (digit_count >= 19 && memcmp(src, smaller_big_integer, 19) >= 0)) {
return number_type::unsigned_integer;
}
return number_type::signed_integer;
}
// Hopefully, we have 'e' or 'E' or '.'.
return number_type::floating_point_number;
}
// Never read at src_end or beyond
simdjson_unused simdjson_inline simdjson_result<double> parse_double(const uint8_t * src, const uint8_t * const src_end) noexcept {
if(src == src_end) { return NUMBER_ERROR; }
//
// Check for minus sign
//
bool negative = (*src == '-');
src += uint8_t(negative);
//
// Parse the integer part.
//
uint64_t i = 0;
const uint8_t *p = src;
if(p == src_end) { return NUMBER_ERROR; }
p += parse_digit(*p, i);
bool leading_zero = (i == 0);
while ((p != src_end) && parse_digit(*p, i)) { p++; }
// no integer digits, or 0123 (zero must be solo)
if ( p == src ) { return INCORRECT_TYPE; }
if ( (leading_zero && p != src+1)) { return NUMBER_ERROR; }
//
// Parse the decimal part.
//
int64_t exponent = 0;
bool overflow;
if (simdjson_likely((p != src_end) && (*p == '.'))) {
p++;
const uint8_t *start_decimal_digits = p;
if ((p == src_end) || !parse_digit(*p, i)) { return NUMBER_ERROR; } // no decimal digits
p++;
while ((p != src_end) && parse_digit(*p, i)) { p++; }
exponent = -(p - start_decimal_digits);
// Overflow check. More than 19 digits (minus the decimal) may be overflow.
overflow = p-src-1 > 19;
if (simdjson_unlikely(overflow && leading_zero)) {
// Skip leading 0.00000 and see if it still overflows
const uint8_t *start_digits = src + 2;
while (*start_digits == '0') { start_digits++; }
overflow = start_digits-src > 19;
}
} else {
overflow = p-src > 19;
}
//
// Parse the exponent
//
if ((p != src_end) && (*p == 'e' || *p == 'E')) {
p++;
if(p == src_end) { return NUMBER_ERROR; }
bool exp_neg = *p == '-';
p += exp_neg || *p == '+';
uint64_t exp = 0;
const uint8_t *start_exp_digits = p;
while ((p != src_end) && parse_digit(*p, exp)) { p++; }
// no exp digits, or 20+ exp digits
if (p-start_exp_digits == 0 || p-start_exp_digits > 19) { return NUMBER_ERROR; }
exponent += exp_neg ? 0-exp : exp;
}
if ((p != src_end) && jsoncharutils::is_not_structural_or_whitespace(*p)) { return NUMBER_ERROR; }
overflow = overflow || exponent < simdjson::internal::smallest_power || exponent > simdjson::internal::largest_power;
//
// Assemble (or slow-parse) the float
//
double d;
if (simdjson_likely(!overflow)) {
if (compute_float_64(exponent, i, negative, d)) { return d; }
}
if (!parse_float_fallback(src - uint8_t(negative), src_end, &d)) {
return NUMBER_ERROR;
}
return d;
}
simdjson_unused simdjson_inline simdjson_result<double> parse_double_in_string(const uint8_t * src) noexcept {
//
// Check for minus sign
//
bool negative = (*(src + 1) == '-');
src += uint8_t(negative) + 1;
//
// Parse the integer part.
//
uint64_t i = 0;
const uint8_t *p = src;
p += parse_digit(*p, i);
bool leading_zero = (i == 0);
while (parse_digit(*p, i)) { p++; }
// no integer digits, or 0123 (zero must be solo)
if ( p == src ) { return INCORRECT_TYPE; }
if ( (leading_zero && p != src+1)) { return NUMBER_ERROR; }
//
// Parse the decimal part.
//
int64_t exponent = 0;
bool overflow;
if (simdjson_likely(*p == '.')) {
p++;
const uint8_t *start_decimal_digits = p;
if (!parse_digit(*p, i)) { return NUMBER_ERROR; } // no decimal digits
p++;
while (parse_digit(*p, i)) { p++; }
exponent = -(p - start_decimal_digits);
// Overflow check. More than 19 digits (minus the decimal) may be overflow.
overflow = p-src-1 > 19;
if (simdjson_unlikely(overflow && leading_zero)) {
// Skip leading 0.00000 and see if it still overflows
const uint8_t *start_digits = src + 2;
while (*start_digits == '0') { start_digits++; }
overflow = p-start_digits > 19;
}
} else {
overflow = p-src > 19;
}
//
// Parse the exponent
//
if (*p == 'e' || *p == 'E') {
p++;
bool exp_neg = *p == '-';
p += exp_neg || *p == '+';
uint64_t exp = 0;
const uint8_t *start_exp_digits = p;
while (parse_digit(*p, exp)) { p++; }
// no exp digits, or 20+ exp digits
if (p-start_exp_digits == 0 || p-start_exp_digits > 19) { return NUMBER_ERROR; }
exponent += exp_neg ? 0-exp : exp;
}
if (*p != '"') { return NUMBER_ERROR; }
overflow = overflow || exponent < simdjson::internal::smallest_power || exponent > simdjson::internal::largest_power;
//
// Assemble (or slow-parse) the float
//
double d;
if (simdjson_likely(!overflow)) {
if (compute_float_64(exponent, i, negative, d)) { return d; }
}
if (!parse_float_fallback(src - uint8_t(negative), &d)) {
return NUMBER_ERROR;
}
return d;
}
} // unnamed namespace
#endif // SIMDJSON_SKIPNUMBERPARSING
} // namespace numberparsing
inline std::ostream& operator<<(std::ostream& out, number_type type) noexcept {
switch (type) {
case number_type::signed_integer: out << "integer in [-9223372036854775808,9223372036854775808)"; break;
case number_type::unsigned_integer: out << "unsigned integer in [9223372036854775808,18446744073709551616)"; break;
case number_type::floating_point_number: out << "floating-point number (binary64)"; break;
case number_type::big_integer: out << "big integer"; break;
default: SIMDJSON_UNREACHABLE();
}
return out;
}
} // namespace fallback
} // namespace simdjson
#endif // SIMDJSON_GENERIC_NUMBERPARSING_H
/* end file simdjson/generic/numberparsing.h for fallback */
/* including simdjson/generic/implementation_simdjson_result_base-inl.h for fallback: #include "simdjson/generic/implementation_simdjson_result_base-inl.h" */
/* begin file simdjson/generic/implementation_simdjson_result_base-inl.h for fallback */
#ifndef SIMDJSON_GENERIC_IMPLEMENTATION_SIMDJSON_RESULT_BASE_INL_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_GENERIC_IMPLEMENTATION_SIMDJSON_RESULT_BASE_INL_H */
/* amalgamation skipped (editor-only): #include "simdjson/generic/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/generic/implementation_simdjson_result_base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace fallback {
//
// internal::implementation_simdjson_result_base<T> inline implementation
//
template<typename T>
simdjson_inline void implementation_simdjson_result_base<T>::tie(T &value, error_code &error) && noexcept {
error = this->second;
if (!error) {
value = std::forward<implementation_simdjson_result_base<T>>(*this).first;
}
}
template<typename T>
simdjson_warn_unused simdjson_inline error_code implementation_simdjson_result_base<T>::get(T &value) && noexcept {
error_code error;
std::forward<implementation_simdjson_result_base<T>>(*this).tie(value, error);
return error;
}
template<typename T>
simdjson_inline error_code implementation_simdjson_result_base<T>::error() const noexcept {
return this->second;
}
#if SIMDJSON_EXCEPTIONS
template<typename T>
simdjson_inline T& implementation_simdjson_result_base<T>::value() & noexcept(false) {
if (error()) { throw simdjson_error(error()); }
return this->first;
}
template<typename T>
simdjson_inline T&& implementation_simdjson_result_base<T>::value() && noexcept(false) {
return std::forward<implementation_simdjson_result_base<T>>(*this).take_value();
}
template<typename T>
simdjson_inline T&& implementation_simdjson_result_base<T>::take_value() && noexcept(false) {
if (error()) { throw simdjson_error(error()); }
return std::forward<T>(this->first);
}
template<typename T>
simdjson_inline implementation_simdjson_result_base<T>::operator T&&() && noexcept(false) {
return std::forward<implementation_simdjson_result_base<T>>(*this).take_value();
}
#endif // SIMDJSON_EXCEPTIONS
template<typename T>
simdjson_inline const T& implementation_simdjson_result_base<T>::value_unsafe() const& noexcept {
return this->first;
}
template<typename T>
simdjson_inline T& implementation_simdjson_result_base<T>::value_unsafe() & noexcept {
return this->first;
}
template<typename T>
simdjson_inline T&& implementation_simdjson_result_base<T>::value_unsafe() && noexcept {
return std::forward<T>(this->first);
}
template<typename T>
simdjson_inline implementation_simdjson_result_base<T>::implementation_simdjson_result_base(T &&value, error_code error) noexcept
: first{std::forward<T>(value)}, second{error} {}
template<typename T>
simdjson_inline implementation_simdjson_result_base<T>::implementation_simdjson_result_base(error_code error) noexcept
: implementation_simdjson_result_base(T{}, error) {}
template<typename T>
simdjson_inline implementation_simdjson_result_base<T>::implementation_simdjson_result_base(T &&value) noexcept
: implementation_simdjson_result_base(std::forward<T>(value), SUCCESS) {}
} // namespace fallback
} // namespace simdjson
#endif // SIMDJSON_GENERIC_IMPLEMENTATION_SIMDJSON_RESULT_BASE_INL_H
/* end file simdjson/generic/implementation_simdjson_result_base-inl.h for fallback */
/* end file simdjson/generic/amalgamated.h for fallback */
/* including simdjson/fallback/end.h: #include "simdjson/fallback/end.h" */
/* begin file simdjson/fallback/end.h */
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/fallback/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
/* undefining SIMDJSON_IMPLEMENTATION from "fallback" */
#undef SIMDJSON_IMPLEMENTATION
/* end file simdjson/fallback/end.h */
#endif // SIMDJSON_FALLBACK_H
/* end file simdjson/fallback.h */
/* including simdjson/fallback/implementation.h: #include <simdjson/fallback/implementation.h> */
/* begin file simdjson/fallback/implementation.h */
#ifndef SIMDJSON_FALLBACK_IMPLEMENTATION_H
#define SIMDJSON_FALLBACK_IMPLEMENTATION_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/fallback/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/implementation.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace fallback {
/**
* @private
*/
class implementation final : public simdjson::implementation {
public:
simdjson_inline implementation() : simdjson::implementation(
"fallback",
"Generic fallback implementation",
0
) {}
simdjson_warn_unused error_code create_dom_parser_implementation(
size_t capacity,
size_t max_length,
std::unique_ptr<simdjson::internal::dom_parser_implementation>& dst
) const noexcept final;
simdjson_warn_unused error_code minify(const uint8_t *buf, size_t len, uint8_t *dst, size_t &dst_len) const noexcept final;
simdjson_warn_unused bool validate_utf8(const char *buf, size_t len) const noexcept final;
};
} // namespace fallback
} // namespace simdjson
#endif // SIMDJSON_FALLBACK_IMPLEMENTATION_H
/* end file simdjson/fallback/implementation.h */
/* including simdjson/fallback/begin.h: #include <simdjson/fallback/begin.h> */
/* begin file simdjson/fallback/begin.h */
/* defining SIMDJSON_IMPLEMENTATION to "fallback" */
#define SIMDJSON_IMPLEMENTATION fallback
/* including simdjson/fallback/base.h: #include "simdjson/fallback/base.h" */
/* begin file simdjson/fallback/base.h */
#ifndef SIMDJSON_FALLBACK_BASE_H
#define SIMDJSON_FALLBACK_BASE_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
/**
* Fallback implementation (runs on any machine).
*/
namespace fallback {
class implementation;
} // namespace fallback
} // namespace simdjson
#endif // SIMDJSON_FALLBACK_BASE_H
/* end file simdjson/fallback/base.h */
/* including simdjson/fallback/bitmanipulation.h: #include "simdjson/fallback/bitmanipulation.h" */
/* begin file simdjson/fallback/bitmanipulation.h */
#ifndef SIMDJSON_FALLBACK_BITMANIPULATION_H
#define SIMDJSON_FALLBACK_BITMANIPULATION_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/fallback/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace fallback {
namespace {
#if defined(_MSC_VER) && !defined(_M_ARM64) && !defined(_M_X64)
static inline unsigned char _BitScanForward64(unsigned long* ret, uint64_t x) {
unsigned long x0 = (unsigned long)x, top, bottom;
_BitScanForward(&top, (unsigned long)(x >> 32));
_BitScanForward(&bottom, x0);
*ret = x0 ? bottom : 32 + top;
return x != 0;
}
static unsigned char _BitScanReverse64(unsigned long* ret, uint64_t x) {
unsigned long x1 = (unsigned long)(x >> 32), top, bottom;
_BitScanReverse(&top, x1);
_BitScanReverse(&bottom, (unsigned long)x);
*ret = x1 ? top + 32 : bottom;
return x != 0;
}
#endif
/* result might be undefined when input_num is zero */
simdjson_inline int leading_zeroes(uint64_t input_num) {
#ifdef _MSC_VER
unsigned long leading_zero = 0;
// Search the mask data from most significant bit (MSB)
// to least significant bit (LSB) for a set bit (1).
if (_BitScanReverse64(&leading_zero, input_num))
return (int)(63 - leading_zero);
else
return 64;
#else
return __builtin_clzll(input_num);
#endif// _MSC_VER
}
} // unnamed namespace
} // namespace fallback
} // namespace simdjson
#endif // SIMDJSON_FALLBACK_BITMANIPULATION_H
/* end file simdjson/fallback/bitmanipulation.h */
/* including simdjson/fallback/stringparsing_defs.h: #include "simdjson/fallback/stringparsing_defs.h" */
/* begin file simdjson/fallback/stringparsing_defs.h */
#ifndef SIMDJSON_FALLBACK_STRINGPARSING_DEFS_H
#define SIMDJSON_FALLBACK_STRINGPARSING_DEFS_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/fallback/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace fallback {
namespace {
// Holds backslashes and quotes locations.
struct backslash_and_quote {
public:
static constexpr uint32_t BYTES_PROCESSED = 1;
simdjson_inline static backslash_and_quote copy_and_find(const uint8_t *src, uint8_t *dst);
simdjson_inline bool has_quote_first() { return c == '"'; }
simdjson_inline bool has_backslash() { return c == '\\'; }
simdjson_inline int quote_index() { return c == '"' ? 0 : 1; }
simdjson_inline int backslash_index() { return c == '\\' ? 0 : 1; }
uint8_t c;
}; // struct backslash_and_quote
simdjson_inline backslash_and_quote backslash_and_quote::copy_and_find(const uint8_t *src, uint8_t *dst) {
// store to dest unconditionally - we can overwrite the bits we don't like later
dst[0] = src[0];
return { src[0] };
}
} // unnamed namespace
} // namespace fallback
} // namespace simdjson
#endif // SIMDJSON_FALLBACK_STRINGPARSING_DEFS_H
/* end file simdjson/fallback/stringparsing_defs.h */
/* including simdjson/fallback/numberparsing_defs.h: #include "simdjson/fallback/numberparsing_defs.h" */
/* begin file simdjson/fallback/numberparsing_defs.h */
#ifndef SIMDJSON_FALLBACK_NUMBERPARSING_DEFS_H
#define SIMDJSON_FALLBACK_NUMBERPARSING_DEFS_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/fallback/base.h" */
/* amalgamation skipped (editor-only): #include "simdjson/internal/numberparsing_tables.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#include <cstring>
#ifdef JSON_TEST_NUMBERS // for unit testing
void found_invalid_number(const uint8_t *buf);
void found_integer(int64_t result, const uint8_t *buf);
void found_unsigned_integer(uint64_t result, const uint8_t *buf);
void found_float(double result, const uint8_t *buf);
#endif
namespace simdjson {
namespace fallback {
namespace numberparsing {
// credit: https://johnnylee-sde.github.io/Fast-numeric-string-to-int/
/** @private */
static simdjson_inline uint32_t parse_eight_digits_unrolled(const char *chars) {
uint64_t val;
memcpy(&val, chars, sizeof(uint64_t));
val = (val & 0x0F0F0F0F0F0F0F0F) * 2561 >> 8;
val = (val & 0x00FF00FF00FF00FF) * 6553601 >> 16;
return uint32_t((val & 0x0000FFFF0000FFFF) * 42949672960001 >> 32);
}
/** @private */
static simdjson_inline uint32_t parse_eight_digits_unrolled(const uint8_t *chars) {
return parse_eight_digits_unrolled(reinterpret_cast<const char *>(chars));
}
#if SIMDJSON_IS_32BITS // _umul128 for x86, arm
// this is a slow emulation routine for 32-bit
//
static simdjson_inline uint64_t __emulu(uint32_t x, uint32_t y) {
return x * (uint64_t)y;
}
static simdjson_inline uint64_t _umul128(uint64_t ab, uint64_t cd, uint64_t *hi) {
uint64_t ad = __emulu((uint32_t)(ab >> 32), (uint32_t)cd);
uint64_t bd = __emulu((uint32_t)ab, (uint32_t)cd);
uint64_t adbc = ad + __emulu((uint32_t)ab, (uint32_t)(cd >> 32));
uint64_t adbc_carry = !!(adbc < ad);
uint64_t lo = bd + (adbc << 32);
*hi = __emulu((uint32_t)(ab >> 32), (uint32_t)(cd >> 32)) + (adbc >> 32) +
(adbc_carry << 32) + !!(lo < bd);
return lo;
}
#endif
/** @private */
simdjson_inline internal::value128 full_multiplication(uint64_t value1, uint64_t value2) {
internal::value128 answer;
#if SIMDJSON_REGULAR_VISUAL_STUDIO || SIMDJSON_IS_32BITS
#ifdef _M_ARM64
// ARM64 has native support for 64-bit multiplications, no need to emultate
answer.high = __umulh(value1, value2);
answer.low = value1 * value2;
#else
answer.low = _umul128(value1, value2, &answer.high); // _umul128 not available on ARM64
#endif // _M_ARM64
#else // SIMDJSON_REGULAR_VISUAL_STUDIO || SIMDJSON_IS_32BITS
__uint128_t r = (static_cast<__uint128_t>(value1)) * value2;
answer.low = uint64_t(r);
answer.high = uint64_t(r >> 64);
#endif
return answer;
}
} // namespace numberparsing
} // namespace fallback
} // namespace simdjson
#define SIMDJSON_SWAR_NUMBER_PARSING 1
#endif // SIMDJSON_FALLBACK_NUMBERPARSING_DEFS_H
/* end file simdjson/fallback/numberparsing_defs.h */
/* end file simdjson/fallback/begin.h */
/* including generic/stage1/find_next_document_index.h for fallback: #include <generic/stage1/find_next_document_index.h> */
/* begin file generic/stage1/find_next_document_index.h for fallback */
#ifndef SIMDJSON_SRC_GENERIC_STAGE1_FIND_NEXT_DOCUMENT_INDEX_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE1_FIND_NEXT_DOCUMENT_INDEX_H */
/* amalgamation skipped (editor-only): #include <generic/stage1/base.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/dom_parser_implementation.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace fallback {
namespace {
namespace stage1 {
/**
* This algorithm is used to quickly identify the last structural position that
* makes up a complete document.
*
* It does this by going backwards and finding the last *document boundary* (a
* place where one value follows another without a comma between them). If the
* last document (the characters after the boundary) has an equal number of
* start and end brackets, it is considered complete.
*
* Simply put, we iterate over the structural characters, starting from
* the end. We consider that we found the end of a JSON document when the
* first element of the pair is NOT one of these characters: '{' '[' ':' ','
* and when the second element is NOT one of these characters: '}' ']' ':' ','.
*
* This simple comparison works most of the time, but it does not cover cases
* where the batch's structural indexes contain a perfect amount of documents.
* In such a case, we do not have access to the structural index which follows
* the last document, therefore, we do not have access to the second element in
* the pair, and that means we cannot identify the last document. To fix this
* issue, we keep a count of the open and closed curly/square braces we found
* while searching for the pair. When we find a pair AND the count of open and
* closed curly/square braces is the same, we know that we just passed a
* complete document, therefore the last json buffer location is the end of the
* batch.
*/
simdjson_inline uint32_t find_next_document_index(dom_parser_implementation &parser) {
// Variant: do not count separately, just figure out depth
if(parser.n_structural_indexes == 0) { return 0; }
auto arr_cnt = 0;
auto obj_cnt = 0;
for (auto i = parser.n_structural_indexes - 1; i > 0; i--) {
auto idxb = parser.structural_indexes[i];
switch (parser.buf[idxb]) {
case ':':
case ',':
continue;
case '}':
obj_cnt--;
continue;
case ']':
arr_cnt--;
continue;
case '{':
obj_cnt++;
break;
case '[':
arr_cnt++;
break;
}
auto idxa = parser.structural_indexes[i - 1];
switch (parser.buf[idxa]) {
case '{':
case '[':
case ':':
case ',':
continue;
}
// Last document is complete, so the next document will appear after!
if (!arr_cnt && !obj_cnt) {
return parser.n_structural_indexes;
}
// Last document is incomplete; mark the document at i + 1 as the next one
return i;
}
// If we made it to the end, we want to finish counting to see if we have a full document.
switch (parser.buf[parser.structural_indexes[0]]) {
case '}':
obj_cnt--;
break;
case ']':
arr_cnt--;
break;
case '{':
obj_cnt++;
break;
case '[':
arr_cnt++;
break;
}
if (!arr_cnt && !obj_cnt) {
// We have a complete document.
return parser.n_structural_indexes;
}
return 0;
}
} // namespace stage1
} // unnamed namespace
} // namespace fallback
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE1_FIND_NEXT_DOCUMENT_INDEX_H
/* end file generic/stage1/find_next_document_index.h for fallback */
/* including generic/stage2/stringparsing.h for fallback: #include <generic/stage2/stringparsing.h> */
/* begin file generic/stage2/stringparsing.h for fallback */
#ifndef SIMDJSON_SRC_GENERIC_STAGE2_STRINGPARSING_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE2_STRINGPARSING_H */
/* amalgamation skipped (editor-only): #include <generic/stage2/base.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/jsoncharutils.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
// This file contains the common code every implementation uses
// It is intended to be included multiple times and compiled multiple times
namespace simdjson {
namespace fallback {
namespace {
/// @private
namespace stringparsing {
// begin copypasta
// These chars yield themselves: " \ /
// b -> backspace, f -> formfeed, n -> newline, r -> cr, t -> horizontal tab
// u not handled in this table as it's complex
static const uint8_t escape_map[256] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x0.
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0x22, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x2f,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x4.
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x5c, 0, 0, 0, // 0x5.
0, 0, 0x08, 0, 0, 0, 0x0c, 0, 0, 0, 0, 0, 0, 0, 0x0a, 0, // 0x6.
0, 0, 0x0d, 0, 0x09, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x7.
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
};
// handle a unicode codepoint
// write appropriate values into dest
// src will advance 6 bytes or 12 bytes
// dest will advance a variable amount (return via pointer)
// return true if the unicode codepoint was valid
// We work in little-endian then swap at write time
simdjson_warn_unused
simdjson_inline bool handle_unicode_codepoint(const uint8_t **src_ptr,
uint8_t **dst_ptr, bool allow_replacement) {
// Use the default Unicode Character 'REPLACEMENT CHARACTER' (U+FFFD)
constexpr uint32_t substitution_code_point = 0xfffd;
// jsoncharutils::hex_to_u32_nocheck fills high 16 bits of the return value with 1s if the
// conversion is not valid; we defer the check for this to inside the
// multilingual plane check.
uint32_t code_point = jsoncharutils::hex_to_u32_nocheck(*src_ptr + 2);
*src_ptr += 6;
// If we found a high surrogate, we must
// check for low surrogate for characters
// outside the Basic
// Multilingual Plane.
if (code_point >= 0xd800 && code_point < 0xdc00) {
const uint8_t *src_data = *src_ptr;
/* Compiler optimizations convert this to a single 16-bit load and compare on most platforms */
if (((src_data[0] << 8) | src_data[1]) != ((static_cast<uint8_t> ('\\') << 8) | static_cast<uint8_t> ('u'))) {
if(!allow_replacement) { return false; }
code_point = substitution_code_point;
} else {
uint32_t code_point_2 = jsoncharutils::hex_to_u32_nocheck(src_data + 2);
// We have already checked that the high surrogate is valid and
// (code_point - 0xd800) < 1024.
//
// Check that code_point_2 is in the range 0xdc00..0xdfff
// and that code_point_2 was parsed from valid hex.
uint32_t low_bit = code_point_2 - 0xdc00;
if (low_bit >> 10) {
if(!allow_replacement) { return false; }
code_point = substitution_code_point;
} else {
code_point = (((code_point - 0xd800) << 10) | low_bit) + 0x10000;
*src_ptr += 6;
}
}
} else if (code_point >= 0xdc00 && code_point <= 0xdfff) {
// If we encounter a low surrogate (not preceded by a high surrogate)
// then we have an error.
if(!allow_replacement) { return false; }
code_point = substitution_code_point;
}
size_t offset = jsoncharutils::codepoint_to_utf8(code_point, *dst_ptr);
*dst_ptr += offset;
return offset > 0;
}
// handle a unicode codepoint using the wobbly convention
// https://simonsapin.github.io/wtf-8/
// write appropriate values into dest
// src will advance 6 bytes or 12 bytes
// dest will advance a variable amount (return via pointer)
// return true if the unicode codepoint was valid
// We work in little-endian then swap at write time
simdjson_warn_unused
simdjson_inline bool handle_unicode_codepoint_wobbly(const uint8_t **src_ptr,
uint8_t **dst_ptr) {
// It is not ideal that this function is nearly identical to handle_unicode_codepoint.
//
// jsoncharutils::hex_to_u32_nocheck fills high 16 bits of the return value with 1s if the
// conversion is not valid; we defer the check for this to inside the
// multilingual plane check.
uint32_t code_point = jsoncharutils::hex_to_u32_nocheck(*src_ptr + 2);
*src_ptr += 6;
// If we found a high surrogate, we must
// check for low surrogate for characters
// outside the Basic
// Multilingual Plane.
if (code_point >= 0xd800 && code_point < 0xdc00) {
const uint8_t *src_data = *src_ptr;
/* Compiler optimizations convert this to a single 16-bit load and compare on most platforms */
if (((src_data[0] << 8) | src_data[1]) == ((static_cast<uint8_t> ('\\') << 8) | static_cast<uint8_t> ('u'))) {
uint32_t code_point_2 = jsoncharutils::hex_to_u32_nocheck(src_data + 2);
uint32_t low_bit = code_point_2 - 0xdc00;
if ((low_bit >> 10) == 0) {
code_point =
(((code_point - 0xd800) << 10) | low_bit) + 0x10000;
*src_ptr += 6;
}
}
}
size_t offset = jsoncharutils::codepoint_to_utf8(code_point, *dst_ptr);
*dst_ptr += offset;
return offset > 0;
}
/**
* Unescape a valid UTF-8 string from src to dst, stopping at a final unescaped quote. There
* must be an unescaped quote terminating the string. It returns the final output
* position as pointer. In case of error (e.g., the string has bad escaped codes),
* then null_nullptrptr is returned. It is assumed that the output buffer is large
* enough. E.g., if src points at 'joe"', then dst needs to have four free bytes +
* SIMDJSON_PADDING bytes.
*/
simdjson_warn_unused simdjson_inline uint8_t *parse_string(const uint8_t *src, uint8_t *dst, bool allow_replacement) {
while (1) {
// Copy the next n bytes, and find the backslash and quote in them.
auto bs_quote = backslash_and_quote::copy_and_find(src, dst);
// If the next thing is the end quote, copy and return
if (bs_quote.has_quote_first()) {
// we encountered quotes first. Move dst to point to quotes and exit
return dst + bs_quote.quote_index();
}
if (bs_quote.has_backslash()) {
/* find out where the backspace is */
auto bs_dist = bs_quote.backslash_index();
uint8_t escape_char = src[bs_dist + 1];
/* we encountered backslash first. Handle backslash */
if (escape_char == 'u') {
/* move src/dst up to the start; they will be further adjusted
within the unicode codepoint handling code. */
src += bs_dist;
dst += bs_dist;
if (!handle_unicode_codepoint(&src, &dst, allow_replacement)) {
return nullptr;
}
} else {
/* simple 1:1 conversion. Will eat bs_dist+2 characters in input and
* write bs_dist+1 characters to output
* note this may reach beyond the part of the buffer we've actually
* seen. I think this is ok */
uint8_t escape_result = escape_map[escape_char];
if (escape_result == 0u) {
return nullptr; /* bogus escape value is an error */
}
dst[bs_dist] = escape_result;
src += bs_dist + 2;
dst += bs_dist + 1;
}
} else {
/* they are the same. Since they can't co-occur, it means we
* encountered neither. */
src += backslash_and_quote::BYTES_PROCESSED;
dst += backslash_and_quote::BYTES_PROCESSED;
}
}
}
simdjson_warn_unused simdjson_inline uint8_t *parse_wobbly_string(const uint8_t *src, uint8_t *dst) {
// It is not ideal that this function is nearly identical to parse_string.
while (1) {
// Copy the next n bytes, and find the backslash and quote in them.
auto bs_quote = backslash_and_quote::copy_and_find(src, dst);
// If the next thing is the end quote, copy and return
if (bs_quote.has_quote_first()) {
// we encountered quotes first. Move dst to point to quotes and exit
return dst + bs_quote.quote_index();
}
if (bs_quote.has_backslash()) {
/* find out where the backspace is */
auto bs_dist = bs_quote.backslash_index();
uint8_t escape_char = src[bs_dist + 1];
/* we encountered backslash first. Handle backslash */
if (escape_char == 'u') {
/* move src/dst up to the start; they will be further adjusted
within the unicode codepoint handling code. */
src += bs_dist;
dst += bs_dist;
if (!handle_unicode_codepoint_wobbly(&src, &dst)) {
return nullptr;
}
} else {
/* simple 1:1 conversion. Will eat bs_dist+2 characters in input and
* write bs_dist+1 characters to output
* note this may reach beyond the part of the buffer we've actually
* seen. I think this is ok */
uint8_t escape_result = escape_map[escape_char];
if (escape_result == 0u) {
return nullptr; /* bogus escape value is an error */
}
dst[bs_dist] = escape_result;
src += bs_dist + 2;
dst += bs_dist + 1;
}
} else {
/* they are the same. Since they can't co-occur, it means we
* encountered neither. */
src += backslash_and_quote::BYTES_PROCESSED;
dst += backslash_and_quote::BYTES_PROCESSED;
}
}
}
} // namespace stringparsing
} // unnamed namespace
} // namespace fallback
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE2_STRINGPARSING_H
/* end file generic/stage2/stringparsing.h for fallback */
/* including generic/stage2/logger.h for fallback: #include <generic/stage2/logger.h> */
/* begin file generic/stage2/logger.h for fallback */
#ifndef SIMDJSON_SRC_GENERIC_STAGE2_LOGGER_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE2_LOGGER_H */
/* amalgamation skipped (editor-only): #include <generic/stage2/base.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#include <cstring>
// This is for an internal-only stage 2 specific logger.
// Set LOG_ENABLED = true to log what stage 2 is doing!
namespace simdjson {
namespace fallback {
namespace {
namespace logger {
static constexpr const char * DASHES = "----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------";
#if SIMDJSON_VERBOSE_LOGGING
static constexpr const bool LOG_ENABLED = true;
#else
static constexpr const bool LOG_ENABLED = false;
#endif
static constexpr const int LOG_EVENT_LEN = 20;
static constexpr const int LOG_BUFFER_LEN = 30;
static constexpr const int LOG_SMALL_BUFFER_LEN = 10;
static constexpr const int LOG_INDEX_LEN = 5;
static int log_depth; // Not threadsafe. Log only.
// Helper to turn unprintable or newline characters into spaces
static simdjson_inline char printable_char(char c) {
if (c >= 0x20) {
return c;
} else {
return ' ';
}
}
// Print the header and set up log_start
static simdjson_inline void log_start() {
if (LOG_ENABLED) {
log_depth = 0;
printf("\n");
printf("| %-*s | %-*s | %-*s | %-*s | Detail |\n", LOG_EVENT_LEN, "Event", LOG_BUFFER_LEN, "Buffer", LOG_SMALL_BUFFER_LEN, "Next", 5, "Next#");
printf("|%.*s|%.*s|%.*s|%.*s|--------|\n", LOG_EVENT_LEN+2, DASHES, LOG_BUFFER_LEN+2, DASHES, LOG_SMALL_BUFFER_LEN+2, DASHES, 5+2, DASHES);
}
}
simdjson_unused static simdjson_inline void log_string(const char *message) {
if (LOG_ENABLED) {
printf("%s\n", message);
}
}
// Logs a single line from the stage 2 DOM parser
template<typename S>
static simdjson_inline void log_line(S &structurals, const char *title_prefix, const char *title, const char *detail) {
if (LOG_ENABLED) {
printf("| %*s%s%-*s ", log_depth*2, "", title_prefix, LOG_EVENT_LEN - log_depth*2 - int(strlen(title_prefix)), title);
auto current_index = structurals.at_beginning() ? nullptr : structurals.next_structural-1;
auto next_index = structurals.next_structural;
auto current = current_index ? &structurals.buf[*current_index] : reinterpret_cast<const uint8_t*>(" ");
auto next = &structurals.buf[*next_index];
{
// Print the next N characters in the buffer.
printf("| ");
// Otherwise, print the characters starting from the buffer position.
// Print spaces for unprintable or newline characters.
for (int i=0;i<LOG_BUFFER_LEN;i++) {
printf("%c", printable_char(current[i]));
}
printf(" ");
// Print the next N characters in the buffer.
printf("| ");
// Otherwise, print the characters starting from the buffer position.
// Print spaces for unprintable or newline characters.
for (int i=0;i<LOG_SMALL_BUFFER_LEN;i++) {
printf("%c", printable_char(next[i]));
}
printf(" ");
}
if (current_index) {
printf("| %*u ", LOG_INDEX_LEN, *current_index);
} else {
printf("| %-*s ", LOG_INDEX_LEN, "");
}
// printf("| %*u ", LOG_INDEX_LEN, structurals.next_tape_index());
printf("| %-s ", detail);
printf("|\n");
}
}
} // namespace logger
} // unnamed namespace
} // namespace fallback
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE2_LOGGER_H
/* end file generic/stage2/logger.h for fallback */
/* including generic/stage2/json_iterator.h for fallback: #include <generic/stage2/json_iterator.h> */
/* begin file generic/stage2/json_iterator.h for fallback */
#ifndef SIMDJSON_SRC_GENERIC_STAGE2_JSON_ITERATOR_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE2_JSON_ITERATOR_H */
/* amalgamation skipped (editor-only): #include <generic/stage2/base.h> */
/* amalgamation skipped (editor-only): #include <generic/stage2/logger.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/dom_parser_implementation.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace fallback {
namespace {
namespace stage2 {
class json_iterator {
public:
const uint8_t* const buf;
uint32_t *next_structural;
dom_parser_implementation &dom_parser;
uint32_t depth{0};
/**
* Walk the JSON document.
*
* The visitor receives callbacks when values are encountered. All callbacks pass the iterator as
* the first parameter; some callbacks have other parameters as well:
*
* - visit_document_start() - at the beginning.
* - visit_document_end() - at the end (if things were successful).
*
* - visit_array_start() - at the start `[` of a non-empty array.
* - visit_array_end() - at the end `]` of a non-empty array.
* - visit_empty_array() - when an empty array is encountered.
*
* - visit_object_end() - at the start `]` of a non-empty object.
* - visit_object_start() - at the end `]` of a non-empty object.
* - visit_empty_object() - when an empty object is encountered.
* - visit_key(const uint8_t *key) - when a key in an object field is encountered. key is
* guaranteed to point at the first quote of the string (`"key"`).
* - visit_primitive(const uint8_t *value) - when a value is a string, number, boolean or null.
* - visit_root_primitive(iter, uint8_t *value) - when the top-level value is a string, number, boolean or null.
*
* - increment_count(iter) - each time a value is found in an array or object.
*/
template<bool STREAMING, typename V>
simdjson_warn_unused simdjson_inline error_code walk_document(V &visitor) noexcept;
/**
* Create an iterator capable of walking a JSON document.
*
* The document must have already passed through stage 1.
*/
simdjson_inline json_iterator(dom_parser_implementation &_dom_parser, size_t start_structural_index);
/**
* Look at the next token.
*
* Tokens can be strings, numbers, booleans, null, or operators (`[{]},:`)).
*
* They may include invalid JSON as well (such as `1.2.3` or `ture`).
*/
simdjson_inline const uint8_t *peek() const noexcept;
/**
* Advance to the next token.
*
* Tokens can be strings, numbers, booleans, null, or operators (`[{]},:`)).
*
* They may include invalid JSON as well (such as `1.2.3` or `ture`).
*/
simdjson_inline const uint8_t *advance() noexcept;
/**
* Get the remaining length of the document, from the start of the current token.
*/
simdjson_inline size_t remaining_len() const noexcept;
/**
* Check if we are at the end of the document.
*
* If this is true, there are no more tokens.
*/
simdjson_inline bool at_eof() const noexcept;
/**
* Check if we are at the beginning of the document.
*/
simdjson_inline bool at_beginning() const noexcept;
simdjson_inline uint8_t last_structural() const noexcept;
/**
* Log that a value has been found.
*
* Set LOG_ENABLED=true in logger.h to see logging.
*/
simdjson_inline void log_value(const char *type) const noexcept;
/**
* Log the start of a multipart value.
*
* Set LOG_ENABLED=true in logger.h to see logging.
*/
simdjson_inline void log_start_value(const char *type) const noexcept;
/**
* Log the end of a multipart value.
*
* Set LOG_ENABLED=true in logger.h to see logging.
*/
simdjson_inline void log_end_value(const char *type) const noexcept;
/**
* Log an error.
*
* Set LOG_ENABLED=true in logger.h to see logging.
*/
simdjson_inline void log_error(const char *error) const noexcept;
template<typename V>
simdjson_warn_unused simdjson_inline error_code visit_root_primitive(V &visitor, const uint8_t *value) noexcept;
template<typename V>
simdjson_warn_unused simdjson_inline error_code visit_primitive(V &visitor, const uint8_t *value) noexcept;
};
template<bool STREAMING, typename V>
simdjson_warn_unused simdjson_inline error_code json_iterator::walk_document(V &visitor) noexcept {
logger::log_start();
//
// Start the document
//
if (at_eof()) { return EMPTY; }
log_start_value("document");
SIMDJSON_TRY( visitor.visit_document_start(*this) );
//
// Read first value
//
{
auto value = advance();
// Make sure the outer object or array is closed before continuing; otherwise, there are ways we
// could get into memory corruption. See https://github.com/simdjson/simdjson/issues/906
if (!STREAMING) {
switch (*value) {
case '{': if (last_structural() != '}') { log_value("starting brace unmatched"); return TAPE_ERROR; }; break;
case '[': if (last_structural() != ']') { log_value("starting bracket unmatched"); return TAPE_ERROR; }; break;
}
}
switch (*value) {
case '{': if (*peek() == '}') { advance(); log_value("empty object"); SIMDJSON_TRY( visitor.visit_empty_object(*this) ); break; } goto object_begin;
case '[': if (*peek() == ']') { advance(); log_value("empty array"); SIMDJSON_TRY( visitor.visit_empty_array(*this) ); break; } goto array_begin;
default: SIMDJSON_TRY( visitor.visit_root_primitive(*this, value) ); break;
}
}
goto document_end;
//
// Object parser states
//
object_begin:
log_start_value("object");
depth++;
if (depth >= dom_parser.max_depth()) { log_error("Exceeded max depth!"); return DEPTH_ERROR; }
dom_parser.is_array[depth] = false;
SIMDJSON_TRY( visitor.visit_object_start(*this) );
{
auto key = advance();
if (*key != '"') { log_error("Object does not start with a key"); return TAPE_ERROR; }
SIMDJSON_TRY( visitor.increment_count(*this) );
SIMDJSON_TRY( visitor.visit_key(*this, key) );
}
object_field:
if (simdjson_unlikely( *advance() != ':' )) { log_error("Missing colon after key in object"); return TAPE_ERROR; }
{
auto value = advance();
switch (*value) {
case '{': if (*peek() == '}') { advance(); log_value("empty object"); SIMDJSON_TRY( visitor.visit_empty_object(*this) ); break; } goto object_begin;
case '[': if (*peek() == ']') { advance(); log_value("empty array"); SIMDJSON_TRY( visitor.visit_empty_array(*this) ); break; } goto array_begin;
default: SIMDJSON_TRY( visitor.visit_primitive(*this, value) ); break;
}
}
object_continue:
switch (*advance()) {
case ',':
SIMDJSON_TRY( visitor.increment_count(*this) );
{
auto key = advance();
if (simdjson_unlikely( *key != '"' )) { log_error("Key string missing at beginning of field in object"); return TAPE_ERROR; }
SIMDJSON_TRY( visitor.visit_key(*this, key) );
}
goto object_field;
case '}': log_end_value("object"); SIMDJSON_TRY( visitor.visit_object_end(*this) ); goto scope_end;
default: log_error("No comma between object fields"); return TAPE_ERROR;
}
scope_end:
depth--;
if (depth == 0) { goto document_end; }
if (dom_parser.is_array[depth]) { goto array_continue; }
goto object_continue;
//
// Array parser states
//
array_begin:
log_start_value("array");
depth++;
if (depth >= dom_parser.max_depth()) { log_error("Exceeded max depth!"); return DEPTH_ERROR; }
dom_parser.is_array[depth] = true;
SIMDJSON_TRY( visitor.visit_array_start(*this) );
SIMDJSON_TRY( visitor.increment_count(*this) );
array_value:
{
auto value = advance();
switch (*value) {
case '{': if (*peek() == '}') { advance(); log_value("empty object"); SIMDJSON_TRY( visitor.visit_empty_object(*this) ); break; } goto object_begin;
case '[': if (*peek() == ']') { advance(); log_value("empty array"); SIMDJSON_TRY( visitor.visit_empty_array(*this) ); break; } goto array_begin;
default: SIMDJSON_TRY( visitor.visit_primitive(*this, value) ); break;
}
}
array_continue:
switch (*advance()) {
case ',': SIMDJSON_TRY( visitor.increment_count(*this) ); goto array_value;
case ']': log_end_value("array"); SIMDJSON_TRY( visitor.visit_array_end(*this) ); goto scope_end;
default: log_error("Missing comma between array values"); return TAPE_ERROR;
}
document_end:
log_end_value("document");
SIMDJSON_TRY( visitor.visit_document_end(*this) );
dom_parser.next_structural_index = uint32_t(next_structural - &dom_parser.structural_indexes[0]);
// If we didn't make it to the end, it's an error
if ( !STREAMING && dom_parser.next_structural_index != dom_parser.n_structural_indexes ) {
log_error("More than one JSON value at the root of the document, or extra characters at the end of the JSON!");
return TAPE_ERROR;
}
return SUCCESS;
} // walk_document()
simdjson_inline json_iterator::json_iterator(dom_parser_implementation &_dom_parser, size_t start_structural_index)
: buf{_dom_parser.buf},
next_structural{&_dom_parser.structural_indexes[start_structural_index]},
dom_parser{_dom_parser} {
}
simdjson_inline const uint8_t *json_iterator::peek() const noexcept {
return &buf[*(next_structural)];
}
simdjson_inline const uint8_t *json_iterator::advance() noexcept {
return &buf[*(next_structural++)];
}
simdjson_inline size_t json_iterator::remaining_len() const noexcept {
return dom_parser.len - *(next_structural-1);
}
simdjson_inline bool json_iterator::at_eof() const noexcept {
return next_structural == &dom_parser.structural_indexes[dom_parser.n_structural_indexes];
}
simdjson_inline bool json_iterator::at_beginning() const noexcept {
return next_structural == dom_parser.structural_indexes.get();
}
simdjson_inline uint8_t json_iterator::last_structural() const noexcept {
return buf[dom_parser.structural_indexes[dom_parser.n_structural_indexes - 1]];
}
simdjson_inline void json_iterator::log_value(const char *type) const noexcept {
logger::log_line(*this, "", type, "");
}
simdjson_inline void json_iterator::log_start_value(const char *type) const noexcept {
logger::log_line(*this, "+", type, "");
if (logger::LOG_ENABLED) { logger::log_depth++; }
}
simdjson_inline void json_iterator::log_end_value(const char *type) const noexcept {
if (logger::LOG_ENABLED) { logger::log_depth--; }
logger::log_line(*this, "-", type, "");
}
simdjson_inline void json_iterator::log_error(const char *error) const noexcept {
logger::log_line(*this, "", "ERROR", error);
}
template<typename V>
simdjson_warn_unused simdjson_inline error_code json_iterator::visit_root_primitive(V &visitor, const uint8_t *value) noexcept {
switch (*value) {
case '"': return visitor.visit_root_string(*this, value);
case 't': return visitor.visit_root_true_atom(*this, value);
case 'f': return visitor.visit_root_false_atom(*this, value);
case 'n': return visitor.visit_root_null_atom(*this, value);
case '-':
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
return visitor.visit_root_number(*this, value);
default:
log_error("Document starts with a non-value character");
return TAPE_ERROR;
}
}
template<typename V>
simdjson_warn_unused simdjson_inline error_code json_iterator::visit_primitive(V &visitor, const uint8_t *value) noexcept {
// Use the fact that most scalars are going to be either strings or numbers.
if(*value == '"') {
return visitor.visit_string(*this, value);
} else if (((*value - '0') < 10) || (*value == '-')) {
return visitor.visit_number(*this, value);
}
// true, false, null are uncommon.
switch (*value) {
case 't': return visitor.visit_true_atom(*this, value);
case 'f': return visitor.visit_false_atom(*this, value);
case 'n': return visitor.visit_null_atom(*this, value);
default:
log_error("Non-value found when value was expected!");
return TAPE_ERROR;
}
}
} // namespace stage2
} // unnamed namespace
} // namespace fallback
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE2_JSON_ITERATOR_H
/* end file generic/stage2/json_iterator.h for fallback */
/* including generic/stage2/tape_writer.h for fallback: #include <generic/stage2/tape_writer.h> */
/* begin file generic/stage2/tape_writer.h for fallback */
#ifndef SIMDJSON_SRC_GENERIC_STAGE2_TAPE_WRITER_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE2_TAPE_WRITER_H */
/* amalgamation skipped (editor-only): #include <generic/stage2/base.h> */
/* amalgamation skipped (editor-only): #include <simdjson/internal/tape_type.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
#include <cstring>
namespace simdjson {
namespace fallback {
namespace {
namespace stage2 {
struct tape_writer {
/** The next place to write to tape */
uint64_t *next_tape_loc;
/** Write a signed 64-bit value to tape. */
simdjson_inline void append_s64(int64_t value) noexcept;
/** Write an unsigned 64-bit value to tape. */
simdjson_inline void append_u64(uint64_t value) noexcept;
/** Write a double value to tape. */
simdjson_inline void append_double(double value) noexcept;
/**
* Append a tape entry (an 8-bit type,and 56 bits worth of value).
*/
simdjson_inline void append(uint64_t val, internal::tape_type t) noexcept;
/**
* Skip the current tape entry without writing.
*
* Used to skip the start of the container, since we'll come back later to fill it in when the
* container ends.
*/
simdjson_inline void skip() noexcept;
/**
* Skip the number of tape entries necessary to write a large u64 or i64.
*/
simdjson_inline void skip_large_integer() noexcept;
/**
* Skip the number of tape entries necessary to write a double.
*/
simdjson_inline void skip_double() noexcept;
/**
* Write a value to a known location on tape.
*
* Used to go back and write out the start of a container after the container ends.
*/
simdjson_inline static void write(uint64_t &tape_loc, uint64_t val, internal::tape_type t) noexcept;
private:
/**
* Append both the tape entry, and a supplementary value following it. Used for types that need
* all 64 bits, such as double and uint64_t.
*/
template<typename T>
simdjson_inline void append2(uint64_t val, T val2, internal::tape_type t) noexcept;
}; // struct tape_writer
simdjson_inline void tape_writer::append_s64(int64_t value) noexcept {
append2(0, value, internal::tape_type::INT64);
}
simdjson_inline void tape_writer::append_u64(uint64_t value) noexcept {
append(0, internal::tape_type::UINT64);
*next_tape_loc = value;
next_tape_loc++;
}
/** Write a double value to tape. */
simdjson_inline void tape_writer::append_double(double value) noexcept {
append2(0, value, internal::tape_type::DOUBLE);
}
simdjson_inline void tape_writer::skip() noexcept {
next_tape_loc++;
}
simdjson_inline void tape_writer::skip_large_integer() noexcept {
next_tape_loc += 2;
}
simdjson_inline void tape_writer::skip_double() noexcept {
next_tape_loc += 2;
}
simdjson_inline void tape_writer::append(uint64_t val, internal::tape_type t) noexcept {
*next_tape_loc = val | ((uint64_t(char(t))) << 56);
next_tape_loc++;
}
template<typename T>
simdjson_inline void tape_writer::append2(uint64_t val, T val2, internal::tape_type t) noexcept {
append(val, t);
static_assert(sizeof(val2) == sizeof(*next_tape_loc), "Type is not 64 bits!");
memcpy(next_tape_loc, &val2, sizeof(val2));
next_tape_loc++;
}
simdjson_inline void tape_writer::write(uint64_t &tape_loc, uint64_t val, internal::tape_type t) noexcept {
tape_loc = val | ((uint64_t(char(t))) << 56);
}
} // namespace stage2
} // unnamed namespace
} // namespace fallback
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE2_TAPE_WRITER_H
/* end file generic/stage2/tape_writer.h for fallback */
/* including generic/stage2/tape_builder.h for fallback: #include <generic/stage2/tape_builder.h> */
/* begin file generic/stage2/tape_builder.h for fallback */
#ifndef SIMDJSON_SRC_GENERIC_STAGE2_TAPE_BUILDER_H
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #define SIMDJSON_SRC_GENERIC_STAGE2_TAPE_BUILDER_H */
/* amalgamation skipped (editor-only): #include <generic/stage2/base.h> */
/* amalgamation skipped (editor-only): #include <generic/stage2/json_iterator.h> */
/* amalgamation skipped (editor-only): #include <generic/stage2/stringparsing.h> */
/* amalgamation skipped (editor-only): #include <generic/stage2/tape_writer.h> */
/* amalgamation skipped (editor-only): #include <simdjson/dom/document.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/atomparsing.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/dom_parser_implementation.h> */
/* amalgamation skipped (editor-only): #include <simdjson/generic/numberparsing.h> */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
namespace simdjson {
namespace fallback {
namespace {
namespace stage2 {
struct tape_builder {
template<bool STREAMING>
simdjson_warn_unused static simdjson_inline error_code parse_document(
dom_parser_implementation &dom_parser,
dom::document &doc) noexcept;
/** Called when a non-empty document starts. */
simdjson_warn_unused simdjson_inline error_code visit_document_start(json_iterator &iter) noexcept;
/** Called when a non-empty document ends without error. */
simdjson_warn_unused simdjson_inline error_code visit_document_end(json_iterator &iter) noexcept;
/** Called when a non-empty array starts. */
simdjson_warn_unused simdjson_inline error_code visit_array_start(json_iterator &iter) noexcept;
/** Called when a non-empty array ends. */
simdjson_warn_unused simdjson_inline error_code visit_array_end(json_iterator &iter) noexcept;
/** Called when an empty array is found. */
simdjson_warn_unused simdjson_inline error_code visit_empty_array(json_iterator &iter) noexcept;
/** Called when a non-empty object starts. */
simdjson_warn_unused simdjson_inline error_code visit_object_start(json_iterator &iter) noexcept;
/**
* Called when a key in a field is encountered.
*
* primitive, visit_object_start, visit_empty_object, visit_array_start, or visit_empty_array
* will be called after this with the field value.
*/
simdjson_warn_unused simdjson_inline error_code visit_key(json_iterator &iter, const uint8_t *key) noexcept;
/** Called when a non-empty object ends. */
simdjson_warn_unused simdjson_inline error_code visit_object_end(json_iterator &iter) noexcept;
/** Called when an empty object is found. */
simdjson_warn_unused simdjson_inline error_code visit_empty_object(json_iterator &iter) noexcept;
/**
* Called when a string, number, boolean or null is found.
*/
simdjson_warn_unused simdjson_inline error_code visit_primitive(json_iterator &iter, const uint8_t *value) noexcept;
/**
* Called when a string, number, boolean or null is found at the top level of a document (i.e.
* when there is no array or object and the entire document is a single string, number, boolean or
* null.
*
* This is separate from primitive() because simdjson's normal primitive parsing routines assume
* there is at least one more token after the value, which is only true in an array or object.
*/
simdjson_warn_unused simdjson_inline error_code visit_root_primitive(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_string(json_iterator &iter, const uint8_t *value, bool key = false) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_number(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_true_atom(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_false_atom(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_null_atom(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_root_string(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_root_number(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_root_true_atom(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_root_false_atom(json_iterator &iter, const uint8_t *value) noexcept;
simdjson_warn_unused simdjson_inline error_code visit_root_null_atom(json_iterator &iter, const uint8_t *value) noexcept;
/** Called each time a new field or element in an array or object is found. */
simdjson_warn_unused simdjson_inline error_code increment_count(json_iterator &iter) noexcept;
/** Next location to write to tape */
tape_writer tape;
private:
/** Next write location in the string buf for stage 2 parsing */
uint8_t *current_string_buf_loc;
simdjson_inline tape_builder(dom::document &doc) noexcept;
simdjson_inline uint32_t next_tape_index(json_iterator &iter) const noexcept;
simdjson_inline void start_container(json_iterator &iter) noexcept;
simdjson_warn_unused simdjson_inline error_code end_container(json_iterator &iter, internal::tape_type start, internal::tape_type end) noexcept;
simdjson_warn_unused simdjson_inline error_code empty_container(json_iterator &iter, internal::tape_type start, internal::tape_type end) noexcept;
simdjson_inline uint8_t *on_start_string(json_iterator &iter) noexcept;
simdjson_inline void on_end_string(uint8_t *dst) noexcept;
}; // struct tape_builder
template<bool STREAMING>
simdjson_warn_unused simdjson_inline error_code tape_builder::parse_document(
dom_parser_implementation &dom_parser,
dom::document &doc) noexcept {
dom_parser.doc = &doc;
json_iterator iter(dom_parser, STREAMING ? dom_parser.next_structural_index : 0);
tape_builder builder(doc);
return iter.walk_document<STREAMING>(builder);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_root_primitive(json_iterator &iter, const uint8_t *value) noexcept {
return iter.visit_root_primitive(*this, value);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_primitive(json_iterator &iter, const uint8_t *value) noexcept {
return iter.visit_primitive(*this, value);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_empty_object(json_iterator &iter) noexcept {
return empty_container(iter, internal::tape_type::START_OBJECT, internal::tape_type::END_OBJECT);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_empty_array(json_iterator &iter) noexcept {
return empty_container(iter, internal::tape_type::START_ARRAY, internal::tape_type::END_ARRAY);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_document_start(json_iterator &iter) noexcept {
start_container(iter);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_object_start(json_iterator &iter) noexcept {
start_container(iter);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_array_start(json_iterator &iter) noexcept {
start_container(iter);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_object_end(json_iterator &iter) noexcept {
return end_container(iter, internal::tape_type::START_OBJECT, internal::tape_type::END_OBJECT);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_array_end(json_iterator &iter) noexcept {
return end_container(iter, internal::tape_type::START_ARRAY, internal::tape_type::END_ARRAY);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_document_end(json_iterator &iter) noexcept {
constexpr uint32_t start_tape_index = 0;
tape.append(start_tape_index, internal::tape_type::ROOT);
tape_writer::write(iter.dom_parser.doc->tape[start_tape_index], next_tape_index(iter), internal::tape_type::ROOT);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_key(json_iterator &iter, const uint8_t *key) noexcept {
return visit_string(iter, key, true);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::increment_count(json_iterator &iter) noexcept {
iter.dom_parser.open_containers[iter.depth].count++; // we have a key value pair in the object at parser.dom_parser.depth - 1
return SUCCESS;
}
simdjson_inline tape_builder::tape_builder(dom::document &doc) noexcept : tape{doc.tape.get()}, current_string_buf_loc{doc.string_buf.get()} {}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_string(json_iterator &iter, const uint8_t *value, bool key) noexcept {
iter.log_value(key ? "key" : "string");
uint8_t *dst = on_start_string(iter);
dst = stringparsing::parse_string(value+1, dst, false); // We do not allow replacement when the escape characters are invalid.
if (dst == nullptr) {
iter.log_error("Invalid escape in string");
return STRING_ERROR;
}
on_end_string(dst);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_root_string(json_iterator &iter, const uint8_t *value) noexcept {
return visit_string(iter, value);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_number(json_iterator &iter, const uint8_t *value) noexcept {
iter.log_value("number");
return numberparsing::parse_number(value, tape);
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_root_number(json_iterator &iter, const uint8_t *value) noexcept {
//
// We need to make a copy to make sure that the string is space terminated.
// This is not about padding the input, which should already padded up
// to len + SIMDJSON_PADDING. However, we have no control at this stage
// on how the padding was done. What if the input string was padded with nulls?
// It is quite common for an input string to have an extra null character (C string).
// We do not want to allow 9\0 (where \0 is the null character) inside a JSON
// document, but the string "9\0" by itself is fine. So we make a copy and
// pad the input with spaces when we know that there is just one input element.
// This copy is relatively expensive, but it will almost never be called in
// practice unless you are in the strange scenario where you have many JSON
// documents made of single atoms.
//
std::unique_ptr<uint8_t[]>copy(new (std::nothrow) uint8_t[iter.remaining_len() + SIMDJSON_PADDING]);
if (copy.get() == nullptr) { return MEMALLOC; }
std::memcpy(copy.get(), value, iter.remaining_len());
std::memset(copy.get() + iter.remaining_len(), ' ', SIMDJSON_PADDING);
error_code error = visit_number(iter, copy.get());
return error;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_true_atom(json_iterator &iter, const uint8_t *value) noexcept {
iter.log_value("true");
if (!atomparsing::is_valid_true_atom(value)) { return T_ATOM_ERROR; }
tape.append(0, internal::tape_type::TRUE_VALUE);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_root_true_atom(json_iterator &iter, const uint8_t *value) noexcept {
iter.log_value("true");
if (!atomparsing::is_valid_true_atom(value, iter.remaining_len())) { return T_ATOM_ERROR; }
tape.append(0, internal::tape_type::TRUE_VALUE);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_false_atom(json_iterator &iter, const uint8_t *value) noexcept {
iter.log_value("false");
if (!atomparsing::is_valid_false_atom(value)) { return F_ATOM_ERROR; }
tape.append(0, internal::tape_type::FALSE_VALUE);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_root_false_atom(json_iterator &iter, const uint8_t *value) noexcept {
iter.log_value("false");
if (!atomparsing::is_valid_false_atom(value, iter.remaining_len())) { return F_ATOM_ERROR; }
tape.append(0, internal::tape_type::FALSE_VALUE);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_null_atom(json_iterator &iter, const uint8_t *value) noexcept {
iter.log_value("null");
if (!atomparsing::is_valid_null_atom(value)) { return N_ATOM_ERROR; }
tape.append(0, internal::tape_type::NULL_VALUE);
return SUCCESS;
}
simdjson_warn_unused simdjson_inline error_code tape_builder::visit_root_null_atom(json_iterator &iter, const uint8_t *value) noexcept {
iter.log_value("null");
if (!atomparsing::is_valid_null_atom(value, iter.remaining_len())) { return N_ATOM_ERROR; }
tape.append(0, internal::tape_type::NULL_VALUE);
return SUCCESS;
}
// private:
simdjson_inline uint32_t tape_builder::next_tape_index(json_iterator &iter) const noexcept {
return uint32_t(tape.next_tape_loc - iter.dom_parser.doc->tape.get());
}
simdjson_warn_unused simdjson_inline error_code tape_builder::empty_container(json_iterator &iter, internal::tape_type start, internal::tape_type end) noexcept {
auto start_index = next_tape_index(iter);
tape.append(start_index+2, start);
tape.append(start_index, end);
return SUCCESS;
}
simdjson_inline void tape_builder::start_container(json_iterator &iter) noexcept {
iter.dom_parser.open_containers[iter.depth].tape_index = next_tape_index(iter);
iter.dom_parser.open_containers[iter.depth].count = 0;
tape.skip(); // We don't actually *write* the start element until the end.
}
simdjson_warn_unused simdjson_inline error_code tape_builder::end_container(json_iterator &iter, internal::tape_type start, internal::tape_type end) noexcept {
// Write the ending tape element, pointing at the start location
const uint32_t start_tape_index = iter.dom_parser.open_containers[iter.depth].tape_index;
tape.append(start_tape_index, end);
// Write the start tape element, pointing at the end location (and including count)
// count can overflow if it exceeds 24 bits... so we saturate
// the convention being that a cnt of 0xffffff or more is undetermined in value (>= 0xffffff).
const uint32_t count = iter.dom_parser.open_containers[iter.depth].count;
const uint32_t cntsat = count > 0xFFFFFF ? 0xFFFFFF : count;
tape_writer::write(iter.dom_parser.doc->tape[start_tape_index], next_tape_index(iter) | (uint64_t(cntsat) << 32), start);
return SUCCESS;
}
simdjson_inline uint8_t *tape_builder::on_start_string(json_iterator &iter) noexcept {
// we advance the point, accounting for the fact that we have a NULL termination
tape.append(current_string_buf_loc - iter.dom_parser.doc->string_buf.get(), internal::tape_type::STRING);
return current_string_buf_loc + sizeof(uint32_t);
}
simdjson_inline void tape_builder::on_end_string(uint8_t *dst) noexcept {
uint32_t str_length = uint32_t(dst - (current_string_buf_loc + sizeof(uint32_t)));
// TODO check for overflow in case someone has a crazy string (>=4GB?)
// But only add the overflow check when the document itself exceeds 4GB
// Currently unneeded because we refuse to parse docs larger or equal to 4GB.
memcpy(current_string_buf_loc, &str_length, sizeof(uint32_t));
// NULL termination is still handy if you expect all your strings to
// be NULL terminated? It comes at a small cost
*dst = 0;
current_string_buf_loc = dst + 1;
}
} // namespace stage2
} // unnamed namespace
} // namespace fallback
} // namespace simdjson
#endif // SIMDJSON_SRC_GENERIC_STAGE2_TAPE_BUILDER_H
/* end file generic/stage2/tape_builder.h for fallback */
//
// Stage 1
//
namespace simdjson {
namespace fallback {
simdjson_warn_unused error_code implementation::create_dom_parser_implementation(
size_t capacity,
size_t max_depth,
std::unique_ptr<internal::dom_parser_implementation>& dst
) const noexcept {
dst.reset( new (std::nothrow) fallback::dom_parser_implementation() );
if (!dst) { return MEMALLOC; }
if (auto err = dst->set_capacity(capacity))
return err;
if (auto err = dst->set_max_depth(max_depth))
return err;
return SUCCESS;
}
namespace {
namespace stage1 {
class structural_scanner {
public:
simdjson_inline structural_scanner(dom_parser_implementation &_parser, stage1_mode _partial)
: buf{_parser.buf},
next_structural_index{_parser.structural_indexes.get()},
parser{_parser},
len{static_cast<uint32_t>(_parser.len)},
partial{_partial} {
}
simdjson_inline void add_structural() {
*next_structural_index = idx;
next_structural_index++;
}
simdjson_inline bool is_continuation(uint8_t c) {
return (c & 0xc0) == 0x80;
}
simdjson_inline void validate_utf8_character() {
// Continuation
if (simdjson_unlikely((buf[idx] & 0x40) == 0)) {
// extra continuation
error = UTF8_ERROR;
idx++;
return;
}
// 2-byte
if ((buf[idx] & 0x20) == 0) {
// missing continuation
if (simdjson_unlikely(idx+1 > len || !is_continuation(buf[idx+1]))) {
if (idx+1 > len && is_streaming(partial)) { idx = len; return; }
error = UTF8_ERROR;
idx++;
return;
}
// overlong: 1100000_ 10______
if (buf[idx] <= 0xc1) { error = UTF8_ERROR; }
idx += 2;
return;
}
// 3-byte
if ((buf[idx] & 0x10) == 0) {
// missing continuation
if (simdjson_unlikely(idx+2 > len || !is_continuation(buf[idx+1]) || !is_continuation(buf[idx+2]))) {
if (idx+2 > len && is_streaming(partial)) { idx = len; return; }
error = UTF8_ERROR;
idx++;
return;
}
// overlong: 11100000 100_____ ________
if (buf[idx] == 0xe0 && buf[idx+1] <= 0x9f) { error = UTF8_ERROR; }
// surrogates: U+D800-U+DFFF 11101101 101_____
if (buf[idx] == 0xed && buf[idx+1] >= 0xa0) { error = UTF8_ERROR; }
idx += 3;
return;
}
// 4-byte
// missing continuation
if (simdjson_unlikely(idx+3 > len || !is_continuation(buf[idx+1]) || !is_continuation(buf[idx+2]) || !is_continuation(buf[idx+3]))) {
if (idx+2 > len && is_streaming(partial)) { idx = len; return; }
error = UTF8_ERROR;
idx++;
return;
}
// overlong: 11110000 1000____ ________ ________
if (buf[idx] == 0xf0 && buf[idx+1] <= 0x8f) { error = UTF8_ERROR; }
// too large: > U+10FFFF:
// 11110100 (1001|101_)____
// 1111(1___|011_|0101) 10______
// also includes 5, 6, 7 and 8 byte characters:
// 11111___
if (buf[idx] == 0xf4 && buf[idx+1] >= 0x90) { error = UTF8_ERROR; }
if (buf[idx] >= 0xf5) { error = UTF8_ERROR; }
idx += 4;
}
// Returns true if the string is unclosed.
simdjson_inline bool validate_string() {
idx++; // skip first quote
while (idx < len && buf[idx] != '"') {
if (buf[idx] == '\\') {
idx += 2;
} else if (simdjson_unlikely(buf[idx] & 0x80)) {
validate_utf8_character();
} else {
if (buf[idx] < 0x20) { error = UNESCAPED_CHARS; }
idx++;
}
}
if (idx >= len) { return true; }
return false;
}
simdjson_inline bool is_whitespace_or_operator(uint8_t c) {
switch (c) {
case '{': case '}': case '[': case ']': case ',': case ':':
case ' ': case '\r': case '\n': case '\t':
return true;
default:
return false;
}
}
//
// Parse the entire input in STEP_SIZE-byte chunks.
//
simdjson_inline error_code scan() {
bool unclosed_string = false;
for (;idx<len;idx++) {
switch (buf[idx]) {
// String
case '"':
add_structural();
unclosed_string |= validate_string();
break;
// Operator
case '{': case '}': case '[': case ']': case ',': case ':':
add_structural();
break;
// Whitespace
case ' ': case '\r': case '\n': case '\t':
break;
// Primitive or invalid character (invalid characters will be checked in stage 2)
default:
// Anything else, add the structural and go until we find the next one
add_structural();
while (idx+1<len && !is_whitespace_or_operator(buf[idx+1])) {
idx++;
};
break;
}
}
// We pad beyond.
// https://github.com/simdjson/simdjson/issues/906
// See json_structural_indexer.h for an explanation.
*next_structural_index = len; // assumed later in partial == stage1_mode::streaming_final
next_structural_index[1] = len;
next_structural_index[2] = 0;
parser.n_structural_indexes = uint32_t(next_structural_index - parser.structural_indexes.get());
if (simdjson_unlikely(parser.n_structural_indexes == 0)) { return EMPTY; }
parser.next_structural_index = 0;
if (partial == stage1_mode::streaming_partial) {
if(unclosed_string) {
parser.n_structural_indexes--;
if (simdjson_unlikely(parser.n_structural_indexes == 0)) { return CAPACITY; }
}
// We truncate the input to the end of the last complete document (or zero).
auto new_structural_indexes = find_next_document_index(parser);
if (new_structural_indexes == 0 && parser.n_structural_indexes > 0) {
if(parser.structural_indexes[0] == 0) {
// If the buffer is partial and we started at index 0 but the document is
// incomplete, it's too big to parse.
return CAPACITY;
} else {
// It is possible that the document could be parsed, we just had a lot
// of white space.
parser.n_structural_indexes = 0;
return EMPTY;
}
}
parser.n_structural_indexes = new_structural_indexes;
} else if(partial == stage1_mode::streaming_final) {
if(unclosed_string) { parser.n_structural_indexes--; }
// We truncate the input to the end of the last complete document (or zero).
// Because partial == stage1_mode::streaming_final, it means that we may
// silently ignore trailing garbage. Though it sounds bad, we do it
// deliberately because many people who have streams of JSON documents
// will truncate them for processing. E.g., imagine that you are uncompressing
// the data from a size file or receiving it in chunks from the network. You
// may not know where exactly the last document will be. Meanwhile the
// document_stream instances allow people to know the JSON documents they are
// parsing (see the iterator.source() method).
parser.n_structural_indexes = find_next_document_index(parser);
// We store the initial n_structural_indexes so that the client can see
// whether we used truncation. If initial_n_structural_indexes == parser.n_structural_indexes,
// then this will query parser.structural_indexes[parser.n_structural_indexes] which is len,
// otherwise, it will copy some prior index.
parser.structural_indexes[parser.n_structural_indexes + 1] = parser.structural_indexes[parser.n_structural_indexes];
// This next line is critical, do not change it unless you understand what you are
// doing.
parser.structural_indexes[parser.n_structural_indexes] = uint32_t(len);
if (parser.n_structural_indexes == 0) { return EMPTY; }
} else if(unclosed_string) { error = UNCLOSED_STRING; }
return error;
}
private:
const uint8_t *buf;
uint32_t *next_structural_index;
dom_parser_implementation &parser;
uint32_t len;
uint32_t idx{0};
error_code error{SUCCESS};
stage1_mode partial;
}; // structural_scanner
} // namespace stage1
} // unnamed namespace
simdjson_warn_unused error_code dom_parser_implementation::stage1(const uint8_t *_buf, size_t _len, stage1_mode partial) noexcept {
this->buf = _buf;
this->len = _len;
stage1::structural_scanner scanner(*this, partial);
return scanner.scan();
}
// big table for the minifier
static uint8_t jump_table[256 * 3] = {
0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0,
1, 1, 0, 1, 0, 0, 1, 0, 0, 1, 1, 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 1, 1, 0, 1,
1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1,
0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 0, 0,
1, 1, 1, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1,
1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1,
0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0,
1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1,
1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1,
0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0,
1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1,
1, 0, 0, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1,
0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0,
1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1,
1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1,
0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0,
1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1,
1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1,
0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0,
1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1,
1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1,
0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0,
1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1,
1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1,
0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0,
1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1,
1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1,
0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0,
1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1,
1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1,
0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1,
};
simdjson_warn_unused error_code implementation::minify(const uint8_t *buf, size_t len, uint8_t *dst, size_t &dst_len) const noexcept {
size_t i = 0, pos = 0;
uint8_t quote = 0;
uint8_t nonescape = 1;
while (i < len) {
unsigned char c = buf[i];
uint8_t *meta = jump_table + 3 * c;
quote = quote ^ (meta[0] & nonescape);
dst[pos] = c;
pos += meta[2] | quote;
i += 1;
nonescape = uint8_t(~nonescape) | (meta[1]);
}
dst_len = pos; // we intentionally do not work with a reference
// for fear of aliasing
return quote ? UNCLOSED_STRING : SUCCESS;
}
// credit: based on code from Google Fuchsia (Apache Licensed)
simdjson_warn_unused bool implementation::validate_utf8(const char *buf, size_t len) const noexcept {
const uint8_t *data = reinterpret_cast<const uint8_t *>(buf);
uint64_t pos = 0;
uint32_t code_point = 0;
while (pos < len) {
// check of the next 8 bytes are ascii.
uint64_t next_pos = pos + 16;
if (next_pos <= len) { // if it is safe to read 8 more bytes, check that they are ascii
uint64_t v1;
memcpy(&v1, data + pos, sizeof(uint64_t));
uint64_t v2;
memcpy(&v2, data + pos + sizeof(uint64_t), sizeof(uint64_t));
uint64_t v{v1 | v2};
if ((v & 0x8080808080808080) == 0) {
pos = next_pos;
continue;
}
}
unsigned char byte = data[pos];
if (byte < 0x80) {
pos++;
continue;
} else if ((byte & 0xe0) == 0xc0) {
next_pos = pos + 2;
if (next_pos > len) { return false; }
if ((data[pos + 1] & 0xc0) != 0x80) { return false; }
// range check
code_point = (byte & 0x1f) << 6 | (data[pos + 1] & 0x3f);
if (code_point < 0x80 || 0x7ff < code_point) { return false; }
} else if ((byte & 0xf0) == 0xe0) {
next_pos = pos + 3;
if (next_pos > len) { return false; }
if ((data[pos + 1] & 0xc0) != 0x80) { return false; }
if ((data[pos + 2] & 0xc0) != 0x80) { return false; }
// range check
code_point = (byte & 0x0f) << 12 |
(data[pos + 1] & 0x3f) << 6 |
(data[pos + 2] & 0x3f);
if (code_point < 0x800 || 0xffff < code_point ||
(0xd7ff < code_point && code_point < 0xe000)) {
return false;
}
} else if ((byte & 0xf8) == 0xf0) { // 0b11110000
next_pos = pos + 4;
if (next_pos > len) { return false; }
if ((data[pos + 1] & 0xc0) != 0x80) { return false; }
if ((data[pos + 2] & 0xc0) != 0x80) { return false; }
if ((data[pos + 3] & 0xc0) != 0x80) { return false; }
// range check
code_point =
(byte & 0x07) << 18 | (data[pos + 1] & 0x3f) << 12 |
(data[pos + 2] & 0x3f) << 6 | (data[pos + 3] & 0x3f);
if (code_point <= 0xffff || 0x10ffff < code_point) { return false; }
} else {
// we may have a continuation
return false;
}
pos = next_pos;
}
return true;
}
} // namespace fallback
} // namespace simdjson
//
// Stage 2
//
namespace simdjson {
namespace fallback {
simdjson_warn_unused error_code dom_parser_implementation::stage2(dom::document &_doc) noexcept {
return stage2::tape_builder::parse_document<false>(*this, _doc);
}
simdjson_warn_unused error_code dom_parser_implementation::stage2_next(dom::document &_doc) noexcept {
return stage2::tape_builder::parse_document<true>(*this, _doc);
}
simdjson_warn_unused uint8_t *dom_parser_implementation::parse_string(const uint8_t *src, uint8_t *dst, bool replacement_char) const noexcept {
return fallback::stringparsing::parse_string(src, dst, replacement_char);
}
simdjson_warn_unused uint8_t *dom_parser_implementation::parse_wobbly_string(const uint8_t *src, uint8_t *dst) const noexcept {
return fallback::stringparsing::parse_wobbly_string(src, dst);
}
simdjson_warn_unused error_code dom_parser_implementation::parse(const uint8_t *_buf, size_t _len, dom::document &_doc) noexcept {
auto error = stage1(_buf, _len, stage1_mode::regular);
if (error) { return error; }
return stage2(_doc);
}
} // namespace fallback
} // namespace simdjson
/* including simdjson/fallback/end.h: #include <simdjson/fallback/end.h> */
/* begin file simdjson/fallback/end.h */
/* amalgamation skipped (editor-only): #ifndef SIMDJSON_CONDITIONAL_INCLUDE */
/* amalgamation skipped (editor-only): #include "simdjson/fallback/base.h" */
/* amalgamation skipped (editor-only): #endif // SIMDJSON_CONDITIONAL_INCLUDE */
/* undefining SIMDJSON_IMPLEMENTATION from "fallback" */
#undef SIMDJSON_IMPLEMENTATION
/* end file simdjson/fallback/end.h */
#endif // SIMDJSON_SRC_FALLBACK_CPP
/* end file fallback.cpp */
#endif
/* undefining SIMDJSON_CONDITIONAL_INCLUDE */
#undef SIMDJSON_CONDITIONAL_INCLUDE
SIMDJSON_POP_DISABLE_UNUSED_WARNINGS
/* end file simdjson.cpp */
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