зеркало из https://github.com/mozilla/gecko-dev.git
71 строка
2.6 KiB
C++
71 строка
2.6 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_AutoProfilerLabel_h
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#define mozilla_AutoProfilerLabel_h
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#include "mozilla/Attributes.h"
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#include "mozilla/Tuple.h"
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#include "mozilla/Types.h"
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// The Gecko Profiler defines AutoProfilerLabel, an RAII class for
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// pushing/popping frames to/from the ProfilingStack.
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//
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// This file defines a class of the same name that does much the same thing,
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// but which can be used in (and only in) mozglue. A different class is
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// necessary because mozglue cannot directly access sProfilingStack.
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//
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// Note that this class is slightly slower than the other AutoProfilerLabel,
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// and it lacks the macro wrappers. It also is effectively hardwired to use
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// JS::ProfilingCategory::OTHER as the category pair, because that's what
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// the callbacks provided by the profiler use. (Specifying the categories in
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// this file would require #including ProfilingCategory.h in mozglue, which we
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// don't want to do.)
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namespace mozilla {
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// Enter should return a pointer that will be given to Exit.
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typedef void* (*ProfilerLabelEnter)(const char* aLabel,
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const char* aDynamicString, void* aSp);
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typedef void (*ProfilerLabelExit)(void* EntryContext);
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// Register callbacks that do the entry/exit work involving sProfilingStack.
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MFBT_API void RegisterProfilerLabelEnterExit(ProfilerLabelEnter aEnter,
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ProfilerLabelExit aExit);
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// This #ifdef prevents this AutoProfilerLabel from being defined in libxul,
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// which would conflict with the one in the profiler.
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#ifdef IMPL_MFBT
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class MOZ_RAII AutoProfilerLabel {
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public:
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AutoProfilerLabel(const char* aLabel, const char* aDynamicString);
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~AutoProfilerLabel();
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private:
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void* mEntryContext;
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// Number of RegisterProfilerLabelEnterExit calls, to avoid giving an entry
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// context from one generation to the next.
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uint32_t mGeneration;
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};
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using ProfilerLabel = Tuple<void*, uint32_t>;
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bool IsProfilerPresent();
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ProfilerLabel ProfilerLabelBegin(const char* aLabelName,
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const char* aDynamicString, void* aSp);
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void ProfilerLabelEnd(const ProfilerLabel& aLabel);
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inline bool IsValidProfilerLabel(const ProfilerLabel& aLabel) {
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return !!Get<0>(aLabel);
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}
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#endif
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} // namespace mozilla
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#endif // mozilla_AutoProfilerLabel_h
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