зеркало из https://github.com/mozilla/gecko-dev.git
430 строки
12 KiB
C++
430 строки
12 KiB
C++
// Copyright (c) 2006-2011 The Chromium Authors. All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions
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// are met:
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in
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// the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google, Inc. nor the names of its contributors
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// may be used to endorse or promote products derived from this
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// software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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// OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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// AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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// OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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// SUCH DAMAGE.
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#ifndef TOOLS_PLATFORM_H_
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#define TOOLS_PLATFORM_H_
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#ifdef SPS_STANDALONE
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#define MOZ_COUNT_CTOR(name)
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#define MOZ_COUNT_DTOR(name)
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#endif
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#ifdef ANDROID
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#include <android/log.h>
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#else
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#define __android_log_print(a, ...)
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#endif
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#ifdef XP_UNIX
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#include <pthread.h>
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#endif
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#include <stdint.h>
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#include <math.h>
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#ifndef SPS_STANDALONE
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#include "MainThreadUtils.h"
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#include "mozilla/Mutex.h"
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#include "ThreadResponsiveness.h"
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#endif
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#include "mozilla/TimeStamp.h"
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#include "mozilla/UniquePtr.h"
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#include "mozilla/unused.h"
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#include "PlatformMacros.h"
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#include "v8-support.h"
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#include <vector>
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#include "StackTop.h"
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// We need a definition of gettid(), but glibc doesn't provide a
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// wrapper for it.
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#if defined(__GLIBC__)
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#include <unistd.h>
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#include <sys/syscall.h>
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static inline pid_t gettid()
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{
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return (pid_t) syscall(SYS_gettid);
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}
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#endif
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#ifdef XP_WIN
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#include <windows.h>
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#endif
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#define ASSERT(a) MOZ_ASSERT(a)
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bool moz_profiler_verbose();
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#ifdef ANDROID
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# if defined(__arm__) || defined(__thumb__)
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# define ENABLE_SPS_LEAF_DATA
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# define ENABLE_ARM_LR_SAVING
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# endif
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# define LOG(text) \
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do { if (moz_profiler_verbose()) \
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__android_log_write(ANDROID_LOG_ERROR, "Profiler", text); \
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} while (0)
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# define LOGF(format, ...) \
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do { if (moz_profiler_verbose()) \
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__android_log_print(ANDROID_LOG_ERROR, "Profiler", format, \
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__VA_ARGS__); \
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} while (0)
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#else
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# define LOG(text) \
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do { if (moz_profiler_verbose()) fprintf(stderr, "Profiler: %s\n", text); \
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} while (0)
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# define LOGF(format, ...) \
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do { if (moz_profiler_verbose()) fprintf(stderr, "Profiler: " format \
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"\n", __VA_ARGS__); \
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} while (0)
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#endif
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#if defined(XP_MACOSX) || defined(XP_WIN) || defined(XP_LINUX)
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#define ENABLE_SPS_LEAF_DATA
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#endif
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typedef int32_t Atomic32;
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extern mozilla::TimeStamp sStartTime;
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typedef uint8_t* Address;
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// ----------------------------------------------------------------------------
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// Mutex
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//
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// Mutexes are used for serializing access to non-reentrant sections of code.
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// The implementations of mutex should allow for nested/recursive locking.
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class Mutex {
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public:
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virtual ~Mutex() {}
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// Locks the given mutex. If the mutex is currently unlocked, it becomes
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// locked and owned by the calling thread, and immediately. If the mutex
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// is already locked by another thread, suspends the calling thread until
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// the mutex is unlocked.
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virtual int Lock() = 0;
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// Unlocks the given mutex. The mutex is assumed to be locked and owned by
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// the calling thread on entrance.
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virtual int Unlock() = 0;
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};
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class MutexAutoLock {
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public:
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explicit MutexAutoLock(::Mutex& aMutex)
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: mMutex(&aMutex)
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{
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mMutex->Lock();
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}
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~MutexAutoLock() {
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mMutex->Unlock();
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}
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private:
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Mutex* mMutex;
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};
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// ----------------------------------------------------------------------------
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// OS
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//
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// This class has static methods for the different platform specific
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// functions. Add methods here to cope with differences between the
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// supported platforms.
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class OS {
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public:
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// Sleep for a number of milliseconds.
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static void Sleep(const int milliseconds);
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// Sleep for a number of microseconds.
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static void SleepMicro(const int microseconds);
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// Called on startup to initialize platform specific things
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static void Startup();
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static mozilla::UniquePtr< ::Mutex> CreateMutex(const char* aDesc);
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private:
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static const int msPerSecond = 1000;
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};
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// ----------------------------------------------------------------------------
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// Thread
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//
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// Thread objects are used for creating and running threads. When the start()
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// method is called the new thread starts running the run() method in the new
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// thread. The Thread object should not be deallocated before the thread has
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// terminated.
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class Thread {
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public:
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// Create new thread.
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explicit Thread(const char* name);
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virtual ~Thread();
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// Start new thread by calling the Run() method in the new thread.
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void Start();
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void Join();
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inline const char* name() const {
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return name_;
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}
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// Abstract method for run handler.
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virtual void Run() = 0;
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// The thread name length is limited to 16 based on Linux's implementation of
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// prctl().
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static const int kMaxThreadNameLength = 16;
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#ifdef XP_WIN
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HANDLE thread_;
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typedef DWORD tid_t;
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tid_t thread_id_;
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#else
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typedef ::pid_t tid_t;
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#endif
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#if defined(XP_MACOSX)
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pthread_t thread_;
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#endif
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static tid_t GetCurrentId();
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private:
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void set_name(const char *name);
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char name_[kMaxThreadNameLength];
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int stack_size_;
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DISALLOW_COPY_AND_ASSIGN(Thread);
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};
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// ----------------------------------------------------------------------------
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// HAVE_NATIVE_UNWIND
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//
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// Pseudo backtraces are available on all platforms. Native
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// backtraces are available only on selected platforms. Breakpad is
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// the only supported native unwinder. HAVE_NATIVE_UNWIND is set at
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// build time to indicate whether native unwinding is possible on this
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// platform.
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#undef HAVE_NATIVE_UNWIND
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#if defined(MOZ_PROFILING) \
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&& (defined(SPS_PLAT_amd64_linux) || defined(SPS_PLAT_arm_android) \
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|| (defined(MOZ_WIDGET_ANDROID) && defined(__arm__)) \
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|| defined(SPS_PLAT_x86_linux) \
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|| defined(SPS_OS_windows) \
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|| defined(SPS_OS_darwin))
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# define HAVE_NATIVE_UNWIND
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#endif
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/* Some values extracted at startup from environment variables, that
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control the behaviour of the breakpad unwinder. */
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extern const char* PROFILER_INTERVAL;
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extern const char* PROFILER_ENTRIES;
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extern const char* PROFILER_STACK;
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extern const char* PROFILER_FEATURES;
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void read_profiler_env_vars();
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void profiler_usage();
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// Helper methods to expose modifying profiler behavior
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bool set_profiler_interval(const char*);
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bool set_profiler_entries(const char*);
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bool set_profiler_scan(const char*);
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bool is_native_unwinding_avail();
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void set_tls_stack_top(void* stackTop);
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// ----------------------------------------------------------------------------
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// Sampler
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//
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// A sampler periodically samples the state of the VM and optionally
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// (if used for profiling) the program counter and stack pointer for
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// the thread that created it.
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struct PseudoStack;
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class ThreadProfile;
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// TickSample captures the information collected for each sample.
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class TickSample {
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public:
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TickSample()
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: pc(NULL)
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, sp(NULL)
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, fp(NULL)
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#ifdef ENABLE_ARM_LR_SAVING
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, lr(NULL)
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#endif
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, context(NULL)
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, isSamplingCurrentThread(false)
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, threadProfile(nullptr)
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, rssMemory(0)
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, ussMemory(0)
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{}
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void PopulateContext(void* aContext);
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Address pc; // Instruction pointer.
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Address sp; // Stack pointer.
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Address fp; // Frame pointer.
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#ifdef ENABLE_ARM_LR_SAVING
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Address lr; // ARM link register
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#endif
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void* context; // The context from the signal handler, if available. On
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// Win32 this may contain the windows thread context.
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bool isSamplingCurrentThread;
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ThreadProfile* threadProfile;
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mozilla::TimeStamp timestamp;
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int64_t rssMemory;
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int64_t ussMemory;
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};
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class ThreadInfo;
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class PlatformData;
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class GeckoSampler;
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class SyncProfile;
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class Sampler {
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public:
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// Initialize sampler.
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explicit Sampler(double interval, bool profiling, int entrySize);
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virtual ~Sampler();
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double interval() const { return interval_; }
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// This method is called for each sampling period with the current
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// program counter.
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virtual void Tick(TickSample* sample) = 0;
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// Immediately captures the calling thread's call stack and returns it.
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virtual SyncProfile* GetBacktrace() = 0;
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// Request a save from a signal handler
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virtual void RequestSave() = 0;
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// Process any outstanding request outside a signal handler.
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virtual void HandleSaveRequest() = 0;
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// Delete markers which are no longer part of the profile due to buffer wraparound.
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virtual void DeleteExpiredMarkers() = 0;
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// Start and stop sampler.
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void Start();
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void Stop();
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// Is the sampler used for profiling?
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bool IsProfiling() const { return profiling_; }
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// Whether the sampler is running (that is, consumes resources).
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bool IsActive() const { return active_; }
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// Low overhead way to stop the sampler from ticking
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bool IsPaused() const { return paused_; }
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void SetPaused(bool value) { NoBarrier_Store(&paused_, value); }
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virtual bool ProfileThreads() const = 0;
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int EntrySize() { return entrySize_; }
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// We can't new/delete the type safely without defining it
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// (-Wdelete-incomplete). Use these Alloc/Free functions instead.
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static PlatformData* AllocPlatformData(int aThreadId);
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static void FreePlatformData(PlatformData*);
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// If we move the backtracing code into the platform files we won't
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// need to have these hacks
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#ifdef XP_WIN
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// xxxehsan sucky hack :(
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static uintptr_t GetThreadHandle(PlatformData*);
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#endif
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#ifdef XP_MACOSX
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static pthread_t GetProfiledThread(PlatformData*);
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#endif
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static std::vector<ThreadInfo*> GetRegisteredThreads() {
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return *sRegisteredThreads;
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}
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static bool RegisterCurrentThread(const char* aName,
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PseudoStack* aPseudoStack,
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bool aIsMainThread, void* stackTop);
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static void UnregisterCurrentThread();
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static void Startup();
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// Should only be called on shutdown
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static void Shutdown();
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static GeckoSampler* GetActiveSampler() { return sActiveSampler; }
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static void SetActiveSampler(GeckoSampler* sampler) { sActiveSampler = sampler; }
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static mozilla::UniquePtr<Mutex> sRegisteredThreadsMutex;
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static bool CanNotifyObservers() {
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#ifdef MOZ_WIDGET_GONK
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// We use profile.sh on b2g to manually select threads and options per process.
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return false;
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#elif defined(SPS_OS_android) && !defined(MOZ_WIDGET_GONK)
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// Android ANR reporter uses the profiler off the main thread
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return NS_IsMainThread();
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#else
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MOZ_ASSERT(NS_IsMainThread());
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return true;
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#endif
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}
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protected:
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static std::vector<ThreadInfo*>* sRegisteredThreads;
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static GeckoSampler* sActiveSampler;
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private:
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void SetActive(bool value) { NoBarrier_Store(&active_, value); }
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const double interval_;
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const bool profiling_;
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Atomic32 paused_;
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Atomic32 active_;
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const int entrySize_;
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// Refactor me!
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#if defined(SPS_OS_linux) || defined(SPS_OS_android)
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bool signal_handler_installed_;
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struct sigaction old_sigprof_signal_handler_;
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struct sigaction old_sigsave_signal_handler_;
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bool signal_sender_launched_;
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pthread_t signal_sender_thread_;
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#endif
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};
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#endif /* ndef TOOLS_PLATFORM_H_ */
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