108 lines
3.4 KiB
C++
108 lines
3.4 KiB
C++
/* 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_ThreadStackHelper_h
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#define mozilla_ThreadStackHelper_h
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#include "js/ProfilingStack.h"
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#include "GeckoProfiler.h"
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#include "HangDetails.h"
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#include "mozilla/Span.h"
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#include "nsThread.h"
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#include <stddef.h>
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#if defined(XP_LINUX)
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# include <signal.h>
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# include <semaphore.h>
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# include <sys/types.h>
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#elif defined(XP_WIN)
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# include <windows.h>
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#elif defined(XP_MACOSX)
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# include <mach/mach.h>
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#endif
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// Support profiling stack and native stack on these platforms.
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#if defined(XP_LINUX) || defined(XP_WIN) || defined(XP_MACOSX)
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# define MOZ_THREADSTACKHELPER_PROFILING_STACK
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# define MOZ_THREADSTACKHELPER_NATIVE_STACK
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#endif
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// There are frequent crashes on Android 32 bit ARM builds during EHABI
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// stackwalking. See bug 1969481.
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#if defined(__ANDROID__) && defined(__arm__)
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# undef MOZ_THREADSTACKHELPER_PROFILING_STACK
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# undef MOZ_THREADSTACKHELPER_NATIVE_STACK
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#endif
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namespace mozilla {
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/**
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* ThreadStackHelper is used to retrieve the profiler's "profiling stack" of a
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* thread, as an alternative of using the profiler to take a profile.
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* The target thread first declares an ThreadStackHelper instance;
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* then another thread can call ThreadStackHelper::GetStack to retrieve
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* the profiling stack of the target thread at that instant.
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*
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* Only non-copying labels are included in the stack, which means labels
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* with custom text and markers are not included.
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*/
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class ThreadStackHelper : public ProfilerStackCollector {
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private:
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HangStack* mStackToFill;
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Array<char, nsThread::kRunnableNameBufSize>* mRunnableNameBuffer;
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size_t mMaxStackSize;
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size_t mMaxBufferSize;
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size_t mDesiredStackSize;
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size_t mDesiredBufferSize;
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bool PrepareStackBuffer(HangStack& aStack);
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public:
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/**
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* Create a ThreadStackHelper instance targeting the current thread.
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*/
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ThreadStackHelper();
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/**
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* Retrieve the current interleaved stack of the thread associated with this
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* ThreadStackHelper.
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*
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* @param aStack HangStack instance to be filled.
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* @param aRunnableName The name of the current runnable on the target thread.
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* @param aStackWalk If true, native stack frames will be collected
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* along with profiling stack frames.
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*/
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void GetStack(HangStack& aStack, nsACString& aRunnableName, bool aStackWalk);
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/**
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* Retrieve the thread's profiler thread ID.
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*/
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ProfilerThreadId GetThreadId() const { return mThreadId; }
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protected:
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/**
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* ProfilerStackCollector
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*/
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virtual void SetIsMainThread() override;
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virtual void CollectNativeLeafAddr(void* aAddr) override;
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virtual void CollectJitReturnAddr(void* aAddr) override;
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virtual void CollectWasmOrSyncJITFrame(JS::ProfilingCategoryPair aCategory,
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const char* aLabel,
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uint32_t aSourceId) override;
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virtual void CollectProfilingStackFrame(
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const js::ProfilingStackFrame& aEntry) override;
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private:
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bool MaybeAppendDynamicStackFrame(mozilla::Span<const char> aBuf);
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void TryAppendFrame(mozilla::HangEntry aFrame);
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// The profiler's unique thread identifier for the target thread.
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ProfilerThreadId mThreadId;
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};
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} // namespace mozilla
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#endif // mozilla_ThreadStackHelper_h
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