mirror of https://github.com/axmolengine/axmol.git
131 lines
4.3 KiB
C++
131 lines
4.3 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
#ifndef jsperf_h___
|
|
#define jsperf_h___
|
|
|
|
#include "jsapi.h"
|
|
|
|
namespace JS {
|
|
|
|
/*
|
|
* JS::PerfMeasurement is a generic way to access detailed performance
|
|
* measurement APIs provided by your operating system. The details of
|
|
* exactly how this works and what can be measured are highly
|
|
* system-specific, but this interface is (one hopes) implementable
|
|
* on top of all of them.
|
|
*
|
|
* To use this API, create a PerfMeasurement object, passing its
|
|
* constructor a bitmask indicating which events you are interested
|
|
* in. Thereafter, Start() zeroes all counters and starts timing;
|
|
* Stop() stops timing again; and the counters for the events you
|
|
* requested are available as data values after calling Stop(). The
|
|
* object may be reused for many measurements.
|
|
*/
|
|
class JS_FRIEND_API(PerfMeasurement)
|
|
{
|
|
protected:
|
|
// Implementation-specific data, if any.
|
|
void* impl;
|
|
|
|
public:
|
|
/*
|
|
* Events that may be measured. Taken directly from the list of
|
|
* "generalized hardware performance event types" in the Linux
|
|
* perf_event API, plus some of the "software events".
|
|
*/
|
|
enum EventMask {
|
|
CPU_CYCLES = 0x00000001,
|
|
INSTRUCTIONS = 0x00000002,
|
|
CACHE_REFERENCES = 0x00000004,
|
|
CACHE_MISSES = 0x00000008,
|
|
BRANCH_INSTRUCTIONS = 0x00000010,
|
|
BRANCH_MISSES = 0x00000020,
|
|
BUS_CYCLES = 0x00000040,
|
|
PAGE_FAULTS = 0x00000080,
|
|
MAJOR_PAGE_FAULTS = 0x00000100,
|
|
CONTEXT_SWITCHES = 0x00000200,
|
|
CPU_MIGRATIONS = 0x00000400,
|
|
|
|
ALL = 0x000007ff,
|
|
NUM_MEASURABLE_EVENTS = 11
|
|
};
|
|
|
|
/*
|
|
* Bitmask of events that will be measured when this object is
|
|
* active (between Start() and Stop()). This may differ from the
|
|
* bitmask passed to the constructor if the platform does not
|
|
* support measuring all of the requested events.
|
|
*/
|
|
const EventMask eventsMeasured;
|
|
|
|
/*
|
|
* Counters for each measurable event.
|
|
* Immediately after one of these objects is created, all of the
|
|
* counters for enabled events will be zero, and all of the
|
|
* counters for disabled events will be uint64_t(-1).
|
|
*/
|
|
uint64_t cpu_cycles;
|
|
uint64_t instructions;
|
|
uint64_t cache_references;
|
|
uint64_t cache_misses;
|
|
uint64_t branch_instructions;
|
|
uint64_t branch_misses;
|
|
uint64_t bus_cycles;
|
|
uint64_t page_faults;
|
|
uint64_t major_page_faults;
|
|
uint64_t context_switches;
|
|
uint64_t cpu_migrations;
|
|
|
|
/*
|
|
* Prepare to measure the indicated set of events. If not all of
|
|
* the requested events can be measured on the current platform,
|
|
* then the eventsMeasured bitmask will only include the subset of
|
|
* |toMeasure| corresponding to the events that can be measured.
|
|
*/
|
|
PerfMeasurement(EventMask toMeasure);
|
|
|
|
/* Done with this set of measurements, tear down OS-level state. */
|
|
~PerfMeasurement();
|
|
|
|
/* Start a measurement cycle. */
|
|
void start();
|
|
|
|
/*
|
|
* End a measurement cycle, and for each enabled counter, add the
|
|
* number of measured events of that type to the appropriate
|
|
* visible variable.
|
|
*/
|
|
void stop();
|
|
|
|
/* Reset all enabled counters to zero. */
|
|
void reset();
|
|
|
|
/*
|
|
* True if this platform supports measuring _something_, i.e. it's
|
|
* not using the stub implementation.
|
|
*/
|
|
static bool canMeasureSomething();
|
|
};
|
|
|
|
/* Inject a Javascript wrapper around the above C++ class into the
|
|
* Javascript object passed as an argument (this will normally be a
|
|
* global object). The JS-visible API is identical to the C++ API.
|
|
*/
|
|
extern JS_FRIEND_API(JSObject*)
|
|
RegisterPerfMeasurement(JSContext *cx, JSObject *global);
|
|
|
|
/*
|
|
* Given a jsval which contains an instance of the aforementioned
|
|
* wrapper class, extract the C++ object. Returns NULL if the
|
|
* jsval is not an instance of the wrapper.
|
|
*/
|
|
extern JS_FRIEND_API(PerfMeasurement*)
|
|
ExtractPerfMeasurement(jsval wrapper);
|
|
|
|
} // namespace JS
|
|
|
|
#endif // jsperf_h___
|