зеркало из https://github.com/mozilla/gecko-dev.git
135 строки
4.4 KiB
C++
135 строки
4.4 KiB
C++
/* -*- Mode: C++; tab-width: 8; 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_ThreadStackHelper_h
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#define mozilla_ThreadStackHelper_h
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#include "mozilla/ThreadHangStats.h"
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#include "js/ProfilingStack.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 pseudostack and native stack on these platforms.
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#if defined(XP_LINUX) || defined(XP_WIN) || defined(XP_MACOSX)
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# ifdef MOZ_GECKO_PROFILER
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# define MOZ_THREADSTACKHELPER_PSEUDO
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# define MOZ_THREADSTACKHELPER_NATIVE
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# endif
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#endif
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// NOTE: Currently, due to a problem with LUL stackwalking initialization taking
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// a long time (bug 1365309), we don't perform pseudostack or native stack
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// walking on Linux.
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#if defined(XP_LINUX)
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# undef MOZ_THREADSTACKHELPER_NATIVE
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# undef MOZ_THREADSTACKHELPER_PSEUDO
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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 pseudo-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 pseudo-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
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{
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public:
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typedef Telemetry::HangStack Stack;
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// When a native stack is gathered, this vector holds the raw program counter
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// values that FramePointerStackWalk will return to us after it walks the
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// stack. When gathering the Telemetry payload, Telemetry will take care of
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// mapping these program counters to proper addresses within modules.
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typedef Telemetry::NativeHangStack NativeStack;
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private:
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#ifdef MOZ_THREADSTACKHELPER_PSEUDO
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Stack* mStackToFill;
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const PseudoStack* const mPseudoStack;
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size_t mMaxStackSize;
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size_t mMaxBufferSize;
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#endif
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#ifdef MOZ_THREADSTACKHELPER_NATIVE
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NativeStack* mNativeStackToFill;
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#endif
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bool PrepareStackBuffer(Stack& aStack);
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void FillStackBuffer();
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#ifdef MOZ_THREADSTACKHELPER_PSEUDO
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const char* AppendJSEntry(const js::ProfileEntry* aEntry,
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intptr_t& aAvailableBufferSize,
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const char* aPrevLabel);
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#endif
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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 pseudostack of the thread associated
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* with this ThreadStackHelper.
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*
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* @param aStack Stack instance to be filled.
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* @param aRunnableName The name of the current runnable on the target thread.
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*/
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void GetPseudoStack(Stack& aStack, nsACString& aRunnableName);
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/**
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* Retrieve the current native stack of the thread associated
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* with this ThreadStackHelper.
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*
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* @param aNativeStack NativeStack instance to be filled.
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* @param aRunnableName The name of the current runnable on the target thread.
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*/
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void GetNativeStack(NativeStack& aNativeStack, nsACString& aRunnableName);
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/**
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* Retrieve the current pseudostack and native stack of the thread associated
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* with this ThreadStackHelper. This method only pauses the target thread once
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* to get both stacks.
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*
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* @param aStack Stack instance to be filled with the pseudostack.
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* @param aNativeStack NativeStack instance to be filled with the native stack.
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* @param aRunnableName The name of the current runnable on the target thread.
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*/
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void GetPseudoAndNativeStack(Stack& aStack,
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NativeStack& aNativeStack,
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nsACString& aRunnableName);
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private:
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// Fill in the passed aStack and aNativeStack datastructures with backtraces.
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// If only aStack needs to be collected, nullptr may be passed for
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// aNativeStack, and vice versa.
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void GetStacksInternal(Stack* aStack,
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NativeStack* aNativeStack,
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nsACString& aRunnableName);
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// The profiler's unique thread identifier for the target thread.
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int mThreadId;
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};
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} // namespace mozilla
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#endif // mozilla_ThreadStackHelper_h
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