/usr/include/mozjs-24/jsperf.h is in libmozjs-24-dev 24.2.0-3ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 | /* -*- 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 perf_jsperf_h
#define perf_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 /* perf_jsperf_h */
|