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axmol/js/spidermonkey-ios/include/jsval.h

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2012-04-18 03:43:08 +08:00
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: set ts=4 sw=4 et tw=99 ft=cpp:
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla SpiderMonkey JavaScript 1.9 code, released
* June 30, 2010
*
* The Initial Developer of the Original Code is
* the Mozilla Corporation.
*
* Contributor(s):
* Luke Wagner <lw@mozilla.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef jsvalimpl_h__
#define jsvalimpl_h__
/*
* Implementation details for js::Value in jsapi.h.
*/
#include "js/Utility.h"
JS_BEGIN_EXTERN_C
/******************************************************************************/
/* To avoid a circular dependency, pull in the necessary pieces of jsnum.h. */
#define JSDOUBLE_SIGNBIT (((uint64_t) 1) << 63)
#define JSDOUBLE_EXPMASK (((uint64_t) 0x7ff) << 52)
#define JSDOUBLE_MANTMASK ((((uint64_t) 1) << 52) - 1)
#define JSDOUBLE_HI32_SIGNBIT 0x80000000
static JS_ALWAYS_INLINE JSBool
JSDOUBLE_IS_NEGZERO(double d)
{
union {
struct {
#if defined(IS_LITTLE_ENDIAN) && !defined(FPU_IS_ARM_FPA)
uint32_t lo, hi;
#else
uint32_t hi, lo;
#endif
} s;
double d;
} x;
if (d != 0)
return JS_FALSE;
x.d = d;
return (x.s.hi & JSDOUBLE_HI32_SIGNBIT) != 0;
}
static JS_ALWAYS_INLINE JSBool
JSDOUBLE_IS_INT32(double d, int32_t* pi)
{
if (JSDOUBLE_IS_NEGZERO(d))
return JS_FALSE;
return d == (*pi = (int32_t)d);
}
/******************************************************************************/
/*
* Try to get jsvals 64-bit aligned. We could almost assert that all values are
* aligned, but MSVC and GCC occasionally break alignment.
*/
#if defined(__GNUC__) || defined(__xlc__) || defined(__xlC__)
# define JSVAL_ALIGNMENT __attribute__((aligned (8)))
#elif defined(_MSC_VER)
/*
* Structs can be aligned with MSVC, but not if they are used as parameters,
* so we just don't try to align.
*/
# define JSVAL_ALIGNMENT
#elif defined(__SUNPRO_C) || defined(__SUNPRO_CC)
# define JSVAL_ALIGNMENT
#elif defined(__HP_cc) || defined(__HP_aCC)
# define JSVAL_ALIGNMENT
#endif
#if JS_BITS_PER_WORD == 64
# define JSVAL_TAG_SHIFT 47
#endif
/*
* We try to use enums so that printing a jsval_layout in the debugger shows
* nice symbolic type tags, however we can only do this when we can force the
* underlying type of the enum to be the desired size.
*/
#if defined(__cplusplus) && !defined(__SUNPRO_CC) && !defined(__xlC__)
#if defined(_MSC_VER)
# define JS_ENUM_HEADER(id, type) enum id : type
# define JS_ENUM_MEMBER(id, type, value) id = (type)value,
# define JS_LAST_ENUM_MEMBER(id, type, value) id = (type)value
# define JS_ENUM_FOOTER(id)
#else
# define JS_ENUM_HEADER(id, type) enum id
# define JS_ENUM_MEMBER(id, type, value) id = (type)value,
# define JS_LAST_ENUM_MEMBER(id, type, value) id = (type)value
# define JS_ENUM_FOOTER(id) __attribute__((packed))
#endif
/* Remember to propagate changes to the C defines below. */
JS_ENUM_HEADER(JSValueType, uint8_t)
{
JSVAL_TYPE_DOUBLE = 0x00,
JSVAL_TYPE_INT32 = 0x01,
JSVAL_TYPE_UNDEFINED = 0x02,
JSVAL_TYPE_BOOLEAN = 0x03,
JSVAL_TYPE_MAGIC = 0x04,
JSVAL_TYPE_STRING = 0x05,
JSVAL_TYPE_NULL = 0x06,
JSVAL_TYPE_OBJECT = 0x07,
/* These never appear in a jsval; they are only provided as an out-of-band value. */
JSVAL_TYPE_UNKNOWN = 0x20,
JSVAL_TYPE_MISSING = 0x21
} JS_ENUM_FOOTER(JSValueType);
JS_STATIC_ASSERT(sizeof(JSValueType) == 1);
#if JS_BITS_PER_WORD == 32
/* Remember to propagate changes to the C defines below. */
JS_ENUM_HEADER(JSValueTag, uint32_t)
{
JSVAL_TAG_CLEAR = 0xFFFFFF80,
JSVAL_TAG_INT32 = JSVAL_TAG_CLEAR | JSVAL_TYPE_INT32,
JSVAL_TAG_UNDEFINED = JSVAL_TAG_CLEAR | JSVAL_TYPE_UNDEFINED,
JSVAL_TAG_STRING = JSVAL_TAG_CLEAR | JSVAL_TYPE_STRING,
JSVAL_TAG_BOOLEAN = JSVAL_TAG_CLEAR | JSVAL_TYPE_BOOLEAN,
JSVAL_TAG_MAGIC = JSVAL_TAG_CLEAR | JSVAL_TYPE_MAGIC,
JSVAL_TAG_NULL = JSVAL_TAG_CLEAR | JSVAL_TYPE_NULL,
JSVAL_TAG_OBJECT = JSVAL_TAG_CLEAR | JSVAL_TYPE_OBJECT
} JS_ENUM_FOOTER(JSValueTag);
JS_STATIC_ASSERT(sizeof(JSValueTag) == 4);
#elif JS_BITS_PER_WORD == 64
/* Remember to propagate changes to the C defines below. */
JS_ENUM_HEADER(JSValueTag, uint32_t)
{
JSVAL_TAG_MAX_DOUBLE = 0x1FFF0,
JSVAL_TAG_INT32 = JSVAL_TAG_MAX_DOUBLE | JSVAL_TYPE_INT32,
JSVAL_TAG_UNDEFINED = JSVAL_TAG_MAX_DOUBLE | JSVAL_TYPE_UNDEFINED,
JSVAL_TAG_STRING = JSVAL_TAG_MAX_DOUBLE | JSVAL_TYPE_STRING,
JSVAL_TAG_BOOLEAN = JSVAL_TAG_MAX_DOUBLE | JSVAL_TYPE_BOOLEAN,
JSVAL_TAG_MAGIC = JSVAL_TAG_MAX_DOUBLE | JSVAL_TYPE_MAGIC,
JSVAL_TAG_NULL = JSVAL_TAG_MAX_DOUBLE | JSVAL_TYPE_NULL,
JSVAL_TAG_OBJECT = JSVAL_TAG_MAX_DOUBLE | JSVAL_TYPE_OBJECT
} JS_ENUM_FOOTER(JSValueTag);
JS_STATIC_ASSERT(sizeof(JSValueTag) == sizeof(uint32_t));
JS_ENUM_HEADER(JSValueShiftedTag, uint64_t)
{
JSVAL_SHIFTED_TAG_MAX_DOUBLE = ((((uint64_t)JSVAL_TAG_MAX_DOUBLE) << JSVAL_TAG_SHIFT) | 0xFFFFFFFF),
JSVAL_SHIFTED_TAG_INT32 = (((uint64_t)JSVAL_TAG_INT32) << JSVAL_TAG_SHIFT),
JSVAL_SHIFTED_TAG_UNDEFINED = (((uint64_t)JSVAL_TAG_UNDEFINED) << JSVAL_TAG_SHIFT),
JSVAL_SHIFTED_TAG_STRING = (((uint64_t)JSVAL_TAG_STRING) << JSVAL_TAG_SHIFT),
JSVAL_SHIFTED_TAG_BOOLEAN = (((uint64_t)JSVAL_TAG_BOOLEAN) << JSVAL_TAG_SHIFT),
JSVAL_SHIFTED_TAG_MAGIC = (((uint64_t)JSVAL_TAG_MAGIC) << JSVAL_TAG_SHIFT),
JSVAL_SHIFTED_TAG_NULL = (((uint64_t)JSVAL_TAG_NULL) << JSVAL_TAG_SHIFT),
JSVAL_SHIFTED_TAG_OBJECT = (((uint64_t)JSVAL_TAG_OBJECT) << JSVAL_TAG_SHIFT)
} JS_ENUM_FOOTER(JSValueShiftedTag);
JS_STATIC_ASSERT(sizeof(JSValueShiftedTag) == sizeof(uint64_t));
#endif
#else /* defined(__cplusplus) */
typedef uint8_t JSValueType;
#define JSVAL_TYPE_DOUBLE ((uint8_t)0x00)
#define JSVAL_TYPE_INT32 ((uint8_t)0x01)
#define JSVAL_TYPE_UNDEFINED ((uint8_t)0x02)
#define JSVAL_TYPE_BOOLEAN ((uint8_t)0x03)
#define JSVAL_TYPE_MAGIC ((uint8_t)0x04)
#define JSVAL_TYPE_STRING ((uint8_t)0x05)
#define JSVAL_TYPE_NULL ((uint8_t)0x06)
#define JSVAL_TYPE_OBJECT ((uint8_t)0x07)
#define JSVAL_TYPE_UNKNOWN ((uint8_t)0x20)
#if JS_BITS_PER_WORD == 32
typedef uint32_t JSValueTag;
#define JSVAL_TAG_CLEAR ((uint32_t)(0xFFFFFF80))
#define JSVAL_TAG_INT32 ((uint32_t)(JSVAL_TAG_CLEAR | JSVAL_TYPE_INT32))
#define JSVAL_TAG_UNDEFINED ((uint32_t)(JSVAL_TAG_CLEAR | JSVAL_TYPE_UNDEFINED))
#define JSVAL_TAG_STRING ((uint32_t)(JSVAL_TAG_CLEAR | JSVAL_TYPE_STRING))
#define JSVAL_TAG_BOOLEAN ((uint32_t)(JSVAL_TAG_CLEAR | JSVAL_TYPE_BOOLEAN))
#define JSVAL_TAG_MAGIC ((uint32_t)(JSVAL_TAG_CLEAR | JSVAL_TYPE_MAGIC))
#define JSVAL_TAG_NULL ((uint32_t)(JSVAL_TAG_CLEAR | JSVAL_TYPE_NULL))
#define JSVAL_TAG_OBJECT ((uint32_t)(JSVAL_TAG_CLEAR | JSVAL_TYPE_OBJECT))
#elif JS_BITS_PER_WORD == 64
typedef uint32_t JSValueTag;
#define JSVAL_TAG_MAX_DOUBLE ((uint32_t)(0x1FFF0))
#define JSVAL_TAG_INT32 (uint32_t)(JSVAL_TAG_MAX_DOUBLE | JSVAL_TYPE_INT32)
#define JSVAL_TAG_UNDEFINED (uint32_t)(JSVAL_TAG_MAX_DOUBLE | JSVAL_TYPE_UNDEFINED)
#define JSVAL_TAG_STRING (uint32_t)(JSVAL_TAG_MAX_DOUBLE | JSVAL_TYPE_STRING)
#define JSVAL_TAG_BOOLEAN (uint32_t)(JSVAL_TAG_MAX_DOUBLE | JSVAL_TYPE_BOOLEAN)
#define JSVAL_TAG_MAGIC (uint32_t)(JSVAL_TAG_MAX_DOUBLE | JSVAL_TYPE_MAGIC)
#define JSVAL_TAG_NULL (uint32_t)(JSVAL_TAG_MAX_DOUBLE | JSVAL_TYPE_NULL)
#define JSVAL_TAG_OBJECT (uint32_t)(JSVAL_TAG_MAX_DOUBLE | JSVAL_TYPE_OBJECT)
typedef uint64_t JSValueShiftedTag;
#define JSVAL_SHIFTED_TAG_MAX_DOUBLE ((((uint64_t)JSVAL_TAG_MAX_DOUBLE) << JSVAL_TAG_SHIFT) | 0xFFFFFFFF)
#define JSVAL_SHIFTED_TAG_INT32 (((uint64_t)JSVAL_TAG_INT32) << JSVAL_TAG_SHIFT)
#define JSVAL_SHIFTED_TAG_UNDEFINED (((uint64_t)JSVAL_TAG_UNDEFINED) << JSVAL_TAG_SHIFT)
#define JSVAL_SHIFTED_TAG_STRING (((uint64_t)JSVAL_TAG_STRING) << JSVAL_TAG_SHIFT)
#define JSVAL_SHIFTED_TAG_BOOLEAN (((uint64_t)JSVAL_TAG_BOOLEAN) << JSVAL_TAG_SHIFT)
#define JSVAL_SHIFTED_TAG_MAGIC (((uint64_t)JSVAL_TAG_MAGIC) << JSVAL_TAG_SHIFT)
#define JSVAL_SHIFTED_TAG_NULL (((uint64_t)JSVAL_TAG_NULL) << JSVAL_TAG_SHIFT)
#define JSVAL_SHIFTED_TAG_OBJECT (((uint64_t)JSVAL_TAG_OBJECT) << JSVAL_TAG_SHIFT)
#endif /* JS_BITS_PER_WORD */
#endif /* defined(__cplusplus) && !defined(__SUNPRO_CC) */
#define JSVAL_LOWER_INCL_TYPE_OF_OBJ_OR_NULL_SET JSVAL_TYPE_NULL
#define JSVAL_UPPER_EXCL_TYPE_OF_PRIMITIVE_SET JSVAL_TYPE_OBJECT
#define JSVAL_UPPER_INCL_TYPE_OF_NUMBER_SET JSVAL_TYPE_INT32
#define JSVAL_LOWER_INCL_TYPE_OF_PTR_PAYLOAD_SET JSVAL_TYPE_MAGIC
#if JS_BITS_PER_WORD == 32
#define JSVAL_TYPE_TO_TAG(type) ((JSValueTag)(JSVAL_TAG_CLEAR | (type)))
#define JSVAL_LOWER_INCL_TAG_OF_OBJ_OR_NULL_SET JSVAL_TAG_NULL
#define JSVAL_UPPER_EXCL_TAG_OF_PRIMITIVE_SET JSVAL_TAG_OBJECT
#define JSVAL_UPPER_INCL_TAG_OF_NUMBER_SET JSVAL_TAG_INT32
#define JSVAL_LOWER_INCL_TAG_OF_GCTHING_SET JSVAL_TAG_STRING
#elif JS_BITS_PER_WORD == 64
#define JSVAL_PAYLOAD_MASK 0x00007FFFFFFFFFFFLL
#define JSVAL_TAG_MASK 0xFFFF800000000000LL
#define JSVAL_TYPE_TO_TAG(type) ((JSValueTag)(JSVAL_TAG_MAX_DOUBLE | (type)))
#define JSVAL_TYPE_TO_SHIFTED_TAG(type) (((uint64_t)JSVAL_TYPE_TO_TAG(type)) << JSVAL_TAG_SHIFT)
#define JSVAL_LOWER_INCL_SHIFTED_TAG_OF_OBJ_OR_NULL_SET JSVAL_SHIFTED_TAG_NULL
#define JSVAL_UPPER_EXCL_SHIFTED_TAG_OF_PRIMITIVE_SET JSVAL_SHIFTED_TAG_OBJECT
#define JSVAL_UPPER_EXCL_SHIFTED_TAG_OF_NUMBER_SET JSVAL_SHIFTED_TAG_UNDEFINED
#define JSVAL_LOWER_INCL_SHIFTED_TAG_OF_GCTHING_SET JSVAL_SHIFTED_TAG_STRING
#endif /* JS_BITS_PER_WORD */
typedef enum JSWhyMagic
{
JS_ARRAY_HOLE, /* a hole in a dense array */
JS_ARGS_HOLE, /* a hole in the args object's array */
JS_NATIVE_ENUMERATE, /* indicates that a custom enumerate hook forwarded
* to JS_EnumerateState, which really means the object can be
* enumerated like a native object. */
JS_NO_ITER_VALUE, /* there is not a pending iterator value */
JS_GENERATOR_CLOSING, /* exception value thrown when closing a generator */
JS_NO_CONSTANT, /* compiler sentinel value */
JS_THIS_POISON, /* used in debug builds to catch tracing errors */
JS_ARG_POISON, /* used in debug builds to catch tracing errors */
JS_SERIALIZE_NO_NODE, /* an empty subnode in the AST serializer */
JS_LAZY_ARGUMENTS, /* lazy arguments value on the stack */
JS_UNASSIGNED_ARGUMENTS, /* the initial value of callobj.arguments */
JS_IS_CONSTRUCTING, /* magic value passed to natives to indicate construction */
JS_GENERIC_MAGIC /* for local use */
} JSWhyMagic;
#if defined(IS_LITTLE_ENDIAN)
# if JS_BITS_PER_WORD == 32
typedef union jsval_layout
{
uint64_t asBits;
struct {
union {
int32_t i32;
uint32_t u32;
JSBool boo;
JSString *str;
JSObject *obj;
void *ptr;
JSWhyMagic why;
size_t word;
} payload;
JSValueTag tag;
} s;
double asDouble;
void *asPtr;
} JSVAL_ALIGNMENT jsval_layout;
# elif JS_BITS_PER_WORD == 64
typedef union jsval_layout
{
uint64_t asBits;
#if (!defined(_WIN64) && defined(__cplusplus))
/* MSVC does not pack these correctly :-( */
struct {
uint64_t payload47 : 47;
JSValueTag tag : 17;
} debugView;
#endif
struct {
union {
int32_t i32;
uint32_t u32;
JSWhyMagic why;
} payload;
} s;
double asDouble;
void *asPtr;
size_t asWord;
} JSVAL_ALIGNMENT jsval_layout;
# endif /* JS_BITS_PER_WORD */
#else /* defined(IS_LITTLE_ENDIAN) */
# if JS_BITS_PER_WORD == 32
typedef union jsval_layout
{
uint64_t asBits;
struct {
JSValueTag tag;
union {
int32_t i32;
uint32_t u32;
JSBool boo;
JSString *str;
JSObject *obj;
void *ptr;
JSWhyMagic why;
size_t word;
} payload;
} s;
double asDouble;
void *asPtr;
} JSVAL_ALIGNMENT jsval_layout;
# elif JS_BITS_PER_WORD == 64
typedef union jsval_layout
{
uint64_t asBits;
struct {
JSValueTag tag : 17;
uint64_t payload47 : 47;
} debugView;
struct {
uint32_t padding;
union {
int32_t i32;
uint32_t u32;
JSWhyMagic why;
} payload;
} s;
double asDouble;
void *asPtr;
size_t asWord;
} JSVAL_ALIGNMENT jsval_layout;
# endif /* JS_BITS_PER_WORD */
#endif /* defined(IS_LITTLE_ENDIAN) */
JS_STATIC_ASSERT(sizeof(jsval_layout) == 8);
#if JS_BITS_PER_WORD == 32
/*
* N.B. GCC, in some but not all cases, chooses to emit signed comparison of
* JSValueTag even though its underlying type has been forced to be uint32_t.
* Thus, all comparisons should explicitly cast operands to uint32_t.
*/
static JS_ALWAYS_INLINE jsval_layout
BUILD_JSVAL(JSValueTag tag, uint32_t payload)
{
jsval_layout l;
l.asBits = (((uint64_t)(uint32_t)tag) << 32) | payload;
return l;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_DOUBLE_IMPL(jsval_layout l)
{
return (uint32_t)l.s.tag <= (uint32_t)JSVAL_TAG_CLEAR;
}
static JS_ALWAYS_INLINE jsval_layout
DOUBLE_TO_JSVAL_IMPL(double d)
{
jsval_layout l;
l.asDouble = d;
JS_ASSERT(JSVAL_IS_DOUBLE_IMPL(l));
return l;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_INT32_IMPL(jsval_layout l)
{
return l.s.tag == JSVAL_TAG_INT32;
}
static JS_ALWAYS_INLINE int32_t
JSVAL_TO_INT32_IMPL(jsval_layout l)
{
return l.s.payload.i32;
}
static JS_ALWAYS_INLINE jsval_layout
INT32_TO_JSVAL_IMPL(int32_t i)
{
jsval_layout l;
l.s.tag = JSVAL_TAG_INT32;
l.s.payload.i32 = i;
return l;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_NUMBER_IMPL(jsval_layout l)
{
JSValueTag tag = l.s.tag;
JS_ASSERT(tag != JSVAL_TAG_CLEAR);
return (uint32_t)tag <= (uint32_t)JSVAL_UPPER_INCL_TAG_OF_NUMBER_SET;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_UNDEFINED_IMPL(jsval_layout l)
{
return l.s.tag == JSVAL_TAG_UNDEFINED;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_STRING_IMPL(jsval_layout l)
{
return l.s.tag == JSVAL_TAG_STRING;
}
static JS_ALWAYS_INLINE jsval_layout
STRING_TO_JSVAL_IMPL(JSString *str)
{
jsval_layout l;
JS_ASSERT(str);
l.s.tag = JSVAL_TAG_STRING;
l.s.payload.str = str;
return l;
}
static JS_ALWAYS_INLINE JSString *
JSVAL_TO_STRING_IMPL(jsval_layout l)
{
return l.s.payload.str;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_BOOLEAN_IMPL(jsval_layout l)
{
return l.s.tag == JSVAL_TAG_BOOLEAN;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_TO_BOOLEAN_IMPL(jsval_layout l)
{
return l.s.payload.boo;
}
static JS_ALWAYS_INLINE jsval_layout
BOOLEAN_TO_JSVAL_IMPL(JSBool b)
{
jsval_layout l;
JS_ASSERT(b == JS_TRUE || b == JS_FALSE);
l.s.tag = JSVAL_TAG_BOOLEAN;
l.s.payload.boo = b;
return l;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_MAGIC_IMPL(jsval_layout l)
{
return l.s.tag == JSVAL_TAG_MAGIC;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_OBJECT_IMPL(jsval_layout l)
{
return l.s.tag == JSVAL_TAG_OBJECT;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_PRIMITIVE_IMPL(jsval_layout l)
{
return (uint32_t)l.s.tag < (uint32_t)JSVAL_UPPER_EXCL_TAG_OF_PRIMITIVE_SET;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_OBJECT_OR_NULL_IMPL(jsval_layout l)
{
JS_ASSERT((uint32_t)l.s.tag <= (uint32_t)JSVAL_TAG_OBJECT);
return (uint32_t)l.s.tag >= (uint32_t)JSVAL_LOWER_INCL_TAG_OF_OBJ_OR_NULL_SET;
}
static JS_ALWAYS_INLINE JSObject *
JSVAL_TO_OBJECT_IMPL(jsval_layout l)
{
return l.s.payload.obj;
}
static JS_ALWAYS_INLINE jsval_layout
OBJECT_TO_JSVAL_IMPL(JSObject *obj)
{
jsval_layout l;
JS_ASSERT(obj);
l.s.tag = JSVAL_TAG_OBJECT;
l.s.payload.obj = obj;
return l;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_NULL_IMPL(jsval_layout l)
{
return l.s.tag == JSVAL_TAG_NULL;
}
static JS_ALWAYS_INLINE jsval_layout
PRIVATE_PTR_TO_JSVAL_IMPL(void *ptr)
{
jsval_layout l;
JS_ASSERT(((uint32_t)ptr & 1) == 0);
l.s.tag = (JSValueTag)0;
l.s.payload.ptr = ptr;
JS_ASSERT(JSVAL_IS_DOUBLE_IMPL(l));
return l;
}
static JS_ALWAYS_INLINE void *
JSVAL_TO_PRIVATE_PTR_IMPL(jsval_layout l)
{
return l.s.payload.ptr;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_GCTHING_IMPL(jsval_layout l)
{
/* gcc sometimes generates signed < without explicit casts. */
return (uint32_t)l.s.tag >= (uint32_t)JSVAL_LOWER_INCL_TAG_OF_GCTHING_SET;
}
static JS_ALWAYS_INLINE void *
JSVAL_TO_GCTHING_IMPL(jsval_layout l)
{
return l.s.payload.ptr;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_TRACEABLE_IMPL(jsval_layout l)
{
return l.s.tag == JSVAL_TAG_STRING || l.s.tag == JSVAL_TAG_OBJECT;
}
static JS_ALWAYS_INLINE uint32_t
JSVAL_TRACE_KIND_IMPL(jsval_layout l)
{
return (uint32_t)(JSBool)JSVAL_IS_STRING_IMPL(l);
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_SPECIFIC_INT32_IMPL(jsval_layout l, int32_t i32)
{
return l.s.tag == JSVAL_TAG_INT32 && l.s.payload.i32 == i32;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_SPECIFIC_BOOLEAN(jsval_layout l, JSBool b)
{
return (l.s.tag == JSVAL_TAG_BOOLEAN) && (l.s.payload.boo == b);
}
static JS_ALWAYS_INLINE jsval_layout
MAGIC_TO_JSVAL_IMPL(JSWhyMagic why)
{
jsval_layout l;
l.s.tag = JSVAL_TAG_MAGIC;
l.s.payload.why = why;
return l;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_SAME_TYPE_IMPL(jsval_layout lhs, jsval_layout rhs)
{
JSValueTag ltag = lhs.s.tag, rtag = rhs.s.tag;
return ltag == rtag || (ltag < JSVAL_TAG_CLEAR && rtag < JSVAL_TAG_CLEAR);
}
static JS_ALWAYS_INLINE jsval_layout
PRIVATE_UINT32_TO_JSVAL_IMPL(uint32_t ui)
{
jsval_layout l;
l.s.tag = (JSValueTag)0;
l.s.payload.u32 = ui;
JS_ASSERT(JSVAL_IS_DOUBLE_IMPL(l));
return l;
}
static JS_ALWAYS_INLINE uint32_t
JSVAL_TO_PRIVATE_UINT32_IMPL(jsval_layout l)
{
return l.s.payload.u32;
}
static JS_ALWAYS_INLINE JSValueType
JSVAL_EXTRACT_NON_DOUBLE_TYPE_IMPL(jsval_layout l)
{
uint32_t type = l.s.tag & 0xF;
JS_ASSERT(type > JSVAL_TYPE_DOUBLE);
return (JSValueType)type;
}
#elif JS_BITS_PER_WORD == 64
static JS_ALWAYS_INLINE jsval_layout
BUILD_JSVAL(JSValueTag tag, uint64_t payload)
{
jsval_layout l;
l.asBits = (((uint64_t)(uint32_t)tag) << JSVAL_TAG_SHIFT) | payload;
return l;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_DOUBLE_IMPL(jsval_layout l)
{
return l.asBits <= JSVAL_SHIFTED_TAG_MAX_DOUBLE;
}
static JS_ALWAYS_INLINE jsval_layout
DOUBLE_TO_JSVAL_IMPL(double d)
{
jsval_layout l;
l.asDouble = d;
JS_ASSERT(l.asBits <= JSVAL_SHIFTED_TAG_MAX_DOUBLE);
return l;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_INT32_IMPL(jsval_layout l)
{
return (uint32_t)(l.asBits >> JSVAL_TAG_SHIFT) == JSVAL_TAG_INT32;
}
static JS_ALWAYS_INLINE int32_t
JSVAL_TO_INT32_IMPL(jsval_layout l)
{
return (int32_t)l.asBits;
}
static JS_ALWAYS_INLINE jsval_layout
INT32_TO_JSVAL_IMPL(int32_t i32)
{
jsval_layout l;
l.asBits = ((uint64_t)(uint32_t)i32) | JSVAL_SHIFTED_TAG_INT32;
return l;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_NUMBER_IMPL(jsval_layout l)
{
return l.asBits < JSVAL_UPPER_EXCL_SHIFTED_TAG_OF_NUMBER_SET;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_UNDEFINED_IMPL(jsval_layout l)
{
return l.asBits == JSVAL_SHIFTED_TAG_UNDEFINED;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_STRING_IMPL(jsval_layout l)
{
return (uint32_t)(l.asBits >> JSVAL_TAG_SHIFT) == JSVAL_TAG_STRING;
}
static JS_ALWAYS_INLINE jsval_layout
STRING_TO_JSVAL_IMPL(JSString *str)
{
jsval_layout l;
uint64_t strBits = (uint64_t)str;
JS_ASSERT(str);
JS_ASSERT((strBits >> JSVAL_TAG_SHIFT) == 0);
l.asBits = strBits | JSVAL_SHIFTED_TAG_STRING;
return l;
}
static JS_ALWAYS_INLINE JSString *
JSVAL_TO_STRING_IMPL(jsval_layout l)
{
return (JSString *)(l.asBits & JSVAL_PAYLOAD_MASK);
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_BOOLEAN_IMPL(jsval_layout l)
{
return (uint32_t)(l.asBits >> JSVAL_TAG_SHIFT) == JSVAL_TAG_BOOLEAN;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_TO_BOOLEAN_IMPL(jsval_layout l)
{
return (JSBool)l.asBits;
}
static JS_ALWAYS_INLINE jsval_layout
BOOLEAN_TO_JSVAL_IMPL(JSBool b)
{
jsval_layout l;
JS_ASSERT(b == JS_TRUE || b == JS_FALSE);
l.asBits = ((uint64_t)(uint32_t)b) | JSVAL_SHIFTED_TAG_BOOLEAN;
return l;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_MAGIC_IMPL(jsval_layout l)
{
return (l.asBits >> JSVAL_TAG_SHIFT) == JSVAL_TAG_MAGIC;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_PRIMITIVE_IMPL(jsval_layout l)
{
return l.asBits < JSVAL_UPPER_EXCL_SHIFTED_TAG_OF_PRIMITIVE_SET;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_OBJECT_IMPL(jsval_layout l)
{
JS_ASSERT((l.asBits >> JSVAL_TAG_SHIFT) <= JSVAL_SHIFTED_TAG_OBJECT);
return l.asBits >= JSVAL_SHIFTED_TAG_OBJECT;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_OBJECT_OR_NULL_IMPL(jsval_layout l)
{
JS_ASSERT((l.asBits >> JSVAL_TAG_SHIFT) <= JSVAL_TAG_OBJECT);
return l.asBits >= JSVAL_LOWER_INCL_SHIFTED_TAG_OF_OBJ_OR_NULL_SET;
}
static JS_ALWAYS_INLINE JSObject *
JSVAL_TO_OBJECT_IMPL(jsval_layout l)
{
uint64_t ptrBits = l.asBits & JSVAL_PAYLOAD_MASK;
JS_ASSERT((ptrBits & 0x7) == 0);
return (JSObject *)ptrBits;
}
static JS_ALWAYS_INLINE jsval_layout
OBJECT_TO_JSVAL_IMPL(JSObject *obj)
{
jsval_layout l;
uint64_t objBits = (uint64_t)obj;
JS_ASSERT(obj);
JS_ASSERT((objBits >> JSVAL_TAG_SHIFT) == 0);
l.asBits = objBits | JSVAL_SHIFTED_TAG_OBJECT;
return l;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_NULL_IMPL(jsval_layout l)
{
return l.asBits == JSVAL_SHIFTED_TAG_NULL;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_GCTHING_IMPL(jsval_layout l)
{
return l.asBits >= JSVAL_LOWER_INCL_SHIFTED_TAG_OF_GCTHING_SET;
}
static JS_ALWAYS_INLINE void *
JSVAL_TO_GCTHING_IMPL(jsval_layout l)
{
uint64_t ptrBits = l.asBits & JSVAL_PAYLOAD_MASK;
JS_ASSERT((ptrBits & 0x7) == 0);
return (void *)ptrBits;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_TRACEABLE_IMPL(jsval_layout l)
{
return JSVAL_IS_GCTHING_IMPL(l) && !JSVAL_IS_NULL_IMPL(l);
}
static JS_ALWAYS_INLINE uint32_t
JSVAL_TRACE_KIND_IMPL(jsval_layout l)
{
return (uint32_t)(JSBool)!(JSVAL_IS_OBJECT_IMPL(l));
}
static JS_ALWAYS_INLINE jsval_layout
PRIVATE_PTR_TO_JSVAL_IMPL(void *ptr)
{
jsval_layout l;
uint64_t ptrBits = (uint64_t)ptr;
JS_ASSERT((ptrBits & 1) == 0);
l.asBits = ptrBits >> 1;
JS_ASSERT(JSVAL_IS_DOUBLE_IMPL(l));
return l;
}
static JS_ALWAYS_INLINE void *
JSVAL_TO_PRIVATE_PTR_IMPL(jsval_layout l)
{
JS_ASSERT((l.asBits & 0x8000000000000000LL) == 0);
return (void *)(l.asBits << 1);
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_SPECIFIC_INT32_IMPL(jsval_layout l, int32_t i32)
{
return l.asBits == (((uint64_t)(uint32_t)i32) | JSVAL_SHIFTED_TAG_INT32);
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_SPECIFIC_BOOLEAN(jsval_layout l, JSBool b)
{
return l.asBits == (((uint64_t)(uint32_t)b) | JSVAL_SHIFTED_TAG_BOOLEAN);
}
static JS_ALWAYS_INLINE jsval_layout
MAGIC_TO_JSVAL_IMPL(JSWhyMagic why)
{
jsval_layout l;
l.asBits = ((uint64_t)(uint32_t)why) | JSVAL_SHIFTED_TAG_MAGIC;
return l;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_SAME_TYPE_IMPL(jsval_layout lhs, jsval_layout rhs)
{
uint64_t lbits = lhs.asBits, rbits = rhs.asBits;
return (lbits <= JSVAL_SHIFTED_TAG_MAX_DOUBLE && rbits <= JSVAL_SHIFTED_TAG_MAX_DOUBLE) ||
(((lbits ^ rbits) & 0xFFFF800000000000LL) == 0);
}
static JS_ALWAYS_INLINE jsval_layout
PRIVATE_UINT32_TO_JSVAL_IMPL(uint32_t ui)
{
jsval_layout l;
l.asBits = (uint64_t)ui;
JS_ASSERT(JSVAL_IS_DOUBLE_IMPL(l));
return l;
}
static JS_ALWAYS_INLINE uint32_t
JSVAL_TO_PRIVATE_UINT32_IMPL(jsval_layout l)
{
JS_ASSERT((l.asBits >> 32) == 0);
return (uint32_t)l.asBits;
}
static JS_ALWAYS_INLINE JSValueType
JSVAL_EXTRACT_NON_DOUBLE_TYPE_IMPL(jsval_layout l)
{
uint64_t type = (l.asBits >> JSVAL_TAG_SHIFT) & 0xF;
JS_ASSERT(type > JSVAL_TYPE_DOUBLE);
return (JSValueType)type;
}
#endif /* JS_BITS_PER_WORD */
static JS_ALWAYS_INLINE double
JS_CANONICALIZE_NAN(double d)
{
if (JS_UNLIKELY(d != d)) {
jsval_layout l;
l.asBits = 0x7FF8000000000000LL;
return l.asDouble;
}
return d;
}
JS_END_EXTERN_C
#ifdef __cplusplus
static jsval_layout JSVAL_TO_IMPL(JS::Value);
static JS::Value IMPL_TO_JSVAL(jsval_layout);
#endif
#endif /* jsvalimpl_h__ */