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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 mozilla_ThreadStackHelper_h
#define mozilla_ThreadStackHelper_h
#ifdef MOZ_GECKO_PROFILER
# include "js/ProfilingStack.h"
# include "GeckoProfiler.h"
# include "HangDetails.h"
# include "mozilla/Span.h"
# include "nsThread.h"
# include <stddef.h>
# if defined(XP_LINUX)
# include <signal.h>
# include <semaphore.h>
# include <sys/types.h>
# elif defined(XP_WIN)
# include <windows.h>
# elif defined(XP_MACOSX)
# include <mach/mach.h>
# endif
// Support profiling stack and native stack on these platforms.
# if defined(XP_LINUX) || defined(XP_WIN) || defined(XP_MACOSX)
# define MOZ_THREADSTACKHELPER_PROFILING_STACK
# define MOZ_THREADSTACKHELPER_NATIVE_STACK
# endif
// Android x86 builds consistently crash in the Background Hang Reporter. bug
// 1368520.
# if defined(__ANDROID__)
# undef MOZ_THREADSTACKHELPER_PROFILING_STACK
# undef MOZ_THREADSTACKHELPER_NATIVE_STACK
# endif
namespace mozilla {
/**
* ThreadStackHelper is used to retrieve the profiler's "profiling stack" of a
* thread, as an alternative of using the profiler to take a profile.
* The target thread first declares an ThreadStackHelper instance;
* then another thread can call ThreadStackHelper::GetStack to retrieve
* the profiling stack of the target thread at that instant.
*
* Only non-copying labels are included in the stack, which means labels
* with custom text and markers are not included.
*/
class ThreadStackHelper : public ProfilerStackCollector {
private:
HangStack* mStackToFill;
Array<char, nsThread::kRunnableNameBufSize>* mRunnableNameBuffer;
size_t mMaxStackSize;
size_t mMaxBufferSize;
size_t mDesiredStackSize;
size_t mDesiredBufferSize;
bool PrepareStackBuffer(HangStack& aStack);
public:
/**
* Create a ThreadStackHelper instance targeting the current thread.
*/
ThreadStackHelper();
/**
* Retrieve the current interleaved stack of the thread associated with this
* ThreadStackHelper.
*
* @param aStack HangStack instance to be filled.
* @param aRunnableName The name of the current runnable on the target thread.
* @param aStackWalk If true, native stack frames will be collected
* along with profiling stack frames.
*/
void GetStack(HangStack& aStack, nsACString& aRunnableName, bool aStackWalk);
/**
* Retrieve the thread's profiler thread ID.
*/
ProfilerThreadId GetThreadId() const { return mThreadId; }
protected:
/**
* ProfilerStackCollector
*/
virtual void SetIsMainThread() override;
virtual void CollectNativeLeafAddr(void* aAddr) override;
virtual void CollectJitReturnAddr(void* aAddr) override;
virtual void CollectWasmFrame(const char* aLabel) override;
virtual void CollectProfilingStackFrame(
const js::ProfilingStackFrame& aEntry) override;
private:
bool MaybeAppendDynamicStackFrame(mozilla::Span<const char> aBuf);
void TryAppendFrame(mozilla::HangEntry aFrame);
// The profiler's unique thread identifier for the target thread.
ProfilerThreadId mThreadId;
};
} // namespace mozilla
#endif // MOZ_GECKO_PROFILER
#endif // mozilla_ThreadStackHelper_h
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