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| author | Matt A. Tobin <mattatobin@localhost.localdomain> | 2018-02-02 04:16:08 -0500 |
|---|---|---|
| committer | Matt A. Tobin <mattatobin@localhost.localdomain> | 2018-02-02 04:16:08 -0500 |
| commit | 5f8de423f190bbb79a62f804151bc24824fa32d8 (patch) | |
| tree | 10027f336435511475e392454359edea8e25895d /xpcom/threads/ThreadStackHelper.h | |
| parent | 49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff) | |
| download | UXP-5f8de423f190bbb79a62f804151bc24824fa32d8.tar UXP-5f8de423f190bbb79a62f804151bc24824fa32d8.tar.gz UXP-5f8de423f190bbb79a62f804151bc24824fa32d8.tar.lz UXP-5f8de423f190bbb79a62f804151bc24824fa32d8.tar.xz UXP-5f8de423f190bbb79a62f804151bc24824fa32d8.zip | |
Add m-esr52 at 52.6.0
Diffstat (limited to 'xpcom/threads/ThreadStackHelper.h')
| -rw-r--r-- | xpcom/threads/ThreadStackHelper.h | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/xpcom/threads/ThreadStackHelper.h b/xpcom/threads/ThreadStackHelper.h new file mode 100644 index 000000000..9c40ad5e2 --- /dev/null +++ b/xpcom/threads/ThreadStackHelper.h @@ -0,0 +1,147 @@ +/* -*- 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 + +#include "mozilla/ThreadHangStats.h" + +#include "GeckoProfiler.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 pseudostack on these platforms. +#if defined(XP_LINUX) || defined(XP_WIN) || defined(XP_MACOSX) +# ifdef MOZ_ENABLE_PROFILER_SPS +# define MOZ_THREADSTACKHELPER_PSEUDO +# endif +#endif + +#ifdef MOZ_THREADSTACKHELPER_PSEUDO +# define MOZ_THREADSTACKHELPER_NATIVE +# if defined(__i386__) || defined(_M_IX86) +# define MOZ_THREADSTACKHELPER_X86 +# elif defined(__x86_64__) || defined(_M_X64) +# define MOZ_THREADSTACKHELPER_X64 +# elif defined(__arm__) || defined(_M_ARM) +# define MOZ_THREADSTACKHELPER_ARM +# else + // Unsupported architecture +# undef MOZ_THREADSTACKHELPER_NATIVE +# endif +#endif + +namespace mozilla { + +/** + * ThreadStackHelper is used to retrieve the profiler pseudo-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 pseudo-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: + typedef Telemetry::HangStack Stack; + +private: + Stack* mStackToFill; +#ifdef MOZ_THREADSTACKHELPER_PSEUDO + const PseudoStack* const mPseudoStack; +#ifdef MOZ_THREADSTACKHELPER_NATIVE + class ThreadContext; + // Set to non-null if GetStack should get the thread context. + ThreadContext* mContextToFill; + intptr_t mThreadStackBase; +#endif + size_t mMaxStackSize; + size_t mMaxBufferSize; +#endif + + bool PrepareStackBuffer(Stack& aStack); + void FillStackBuffer(); + void FillThreadContext(void* aContext = nullptr); +#ifdef MOZ_THREADSTACKHELPER_PSEUDO + const char* AppendJSEntry(const volatile StackEntry* aEntry, + intptr_t& aAvailableBufferSize, + const char* aPrevLabel); +#endif +#ifdef MOZ_THREADSTACKHELPER_NATIVE + void GetThreadStackBase(); +#endif + +public: + /** + * Initialize ThreadStackHelper. Must be called from main thread. + */ + static void Startup(); + /** + * Uninitialize ThreadStackHelper. Must be called from main thread. + */ + static void Shutdown(); + + /** + * Create a ThreadStackHelper instance targeting the current thread. + */ + ThreadStackHelper(); + + ~ThreadStackHelper(); + + /** + * Retrieve the current pseudostack of the thread associated + * with this ThreadStackHelper. + * + * @param aStack Stack instance to be filled. + */ + void GetStack(Stack& aStack); + + /** + * Retrieve the current native stack of the thread associated + * with this ThreadStackHelper. + * + * @param aNativeStack Stack instance to be filled. + */ + void GetNativeStack(Stack& aStack); + +#if defined(XP_LINUX) +private: + static int sInitialized; + static int sFillStackSignum; + + static void FillStackHandler(int aSignal, siginfo_t* aInfo, void* aContext); + + sem_t mSem; + pid_t mThreadID; + +#elif defined(XP_WIN) +private: + bool mInitialized; + HANDLE mThreadID; + +#elif defined(XP_MACOSX) +private: + thread_act_t mThreadID; + +#endif +}; + +} // namespace mozilla + +#endif // mozilla_ThreadStackHelper_h |