gecko-dev/tools/profiler/platform.h

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// Copyright (c) 2006-2011 The Chromium Authors. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in
// the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google, Inc. nor the names of its contributors
// may be used to endorse or promote products derived from this
// software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
// OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
// AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
// OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
// SUCH DAMAGE.
#ifdef ANDROID
#include <android/log.h>
#else
#define __android_log_print(a, ...)
#endif
#include "mozilla/StandardInteger.h"
#include "mozilla/Util.h"
#include "mozilla/unused.h"
#include "mozilla/TimeStamp.h"
#include "v8-support.h"
#include <vector>
#define ASSERT(a) MOZ_ASSERT(a)
#ifdef ANDROID
#if defined(__arm__) || defined(__thumb__)
#define ENABLE_SPS_LEAF_DATA
#define ENABLE_ARM_LR_SAVING
#endif
#define LOG(text) __android_log_write(ANDROID_LOG_ERROR, "profiler", text)
#define LOGF(format, ...) __android_log_print(ANDROID_LOG_ERROR, "profiler", format, __VA_ARGS__)
#else
#define LOG(text) printf("Profiler: %s\n", text)
#define LOGF(format, ...) printf("Profiler: " format "\n", __VA_ARGS__)
#endif
#if defined(XP_MACOSX) || defined(XP_WIN)
#define ENABLE_SPS_LEAF_DATA
#endif
typedef uint8_t* Address;
// ----------------------------------------------------------------------------
// Mutex
//
// Mutexes are used for serializing access to non-reentrant sections of code.
// The implementations of mutex should allow for nested/recursive locking.
class Mutex {
public:
virtual ~Mutex() {}
// Locks the given mutex. If the mutex is currently unlocked, it becomes
// locked and owned by the calling thread, and immediately. If the mutex
// is already locked by another thread, suspends the calling thread until
// the mutex is unlocked.
virtual int Lock() = 0;
// Unlocks the given mutex. The mutex is assumed to be locked and owned by
// the calling thread on entrance.
virtual int Unlock() = 0;
// Tries to lock the given mutex. Returns whether the mutex was
// successfully locked.
virtual bool TryLock() = 0;
};
// ----------------------------------------------------------------------------
// ScopedLock
//
// Stack-allocated ScopedLocks provide block-scoped locking and
// unlocking of a mutex.
class ScopedLock {
public:
explicit ScopedLock(Mutex* mutex): mutex_(mutex) {
ASSERT(mutex_ != NULL);
mutex_->Lock();
}
~ScopedLock() {
mutex_->Unlock();
}
private:
Mutex* mutex_;
DISALLOW_COPY_AND_ASSIGN(ScopedLock);
};
// ----------------------------------------------------------------------------
// OS
//
// This class has static methods for the different platform specific
// functions. Add methods here to cope with differences between the
// supported platforms.
class OS {
public:
// Sleep for a number of milliseconds.
static void Sleep(const int milliseconds);
// Factory method for creating platform dependent Mutex.
// Please use delete to reclaim the storage for the returned Mutex.
static Mutex* CreateMutex();
// On supported platforms, setup a signal handler which would start
// the profiler.
#if defined(ANDROID)
static void RegisterStartHandler();
#else
static void RegisterStartHandler() {}
#endif
private:
static const int msPerSecond = 1000;
};
// ----------------------------------------------------------------------------
// Thread
//
// Thread objects are used for creating and running threads. When the start()
// method is called the new thread starts running the run() method in the new
// thread. The Thread object should not be deallocated before the thread has
// terminated.
class Thread {
public:
// Create new thread.
explicit Thread(const char* name);
virtual ~Thread();
// Start new thread by calling the Run() method in the new thread.
void Start();
void Join();
inline const char* name() const {
return name_;
}
// Abstract method for run handler.
virtual void Run() = 0;
// The thread name length is limited to 16 based on Linux's implementation of
// prctl().
static const int kMaxThreadNameLength = 16;
class PlatformData;
PlatformData* data() { return data_; }
private:
void set_name(const char *name);
PlatformData* data_;
char name_[kMaxThreadNameLength];
int stack_size_;
DISALLOW_COPY_AND_ASSIGN(Thread);
};
// ----------------------------------------------------------------------------
// Sampler
//
// A sampler periodically samples the state of the VM and optionally
// (if used for profiling) the program counter and stack pointer for
// the thread that created it.
// TickSample captures the information collected for each sample.
class TickSample {
public:
TickSample()
:
pc(NULL),
sp(NULL),
fp(NULL),
#ifdef ENABLE_ARM_LR_SAVING
lr(NULL),
#endif
function(NULL),
context(NULL),
frames_count(0) {}
Address pc; // Instruction pointer.
Address sp; // Stack pointer.
Address fp; // Frame pointer.
#ifdef ENABLE_ARM_LR_SAVING
Address lr; // ARM link register
#endif
Address function; // The last called JS function.
void* context; // The context from the signal handler, if available. On
// Win32 this may contain the windows thread context.
static const int kMaxFramesCount = 64;
Address stack[kMaxFramesCount]; // Call stack.
int frames_count; // Number of captured frames.
mozilla::TimeStamp timestamp;
};
class Sampler {
public:
// Initialize sampler.
explicit Sampler(int interval, bool profiling);
virtual ~Sampler();
int interval() const { return interval_; }
// Performs stack sampling.
virtual void SampleStack(TickSample* sample) = 0;
// This method is called for each sampling period with the current
// program counter.
virtual void Tick(TickSample* sample) = 0;
// Request a save from a signal handler
virtual void RequestSave() = 0;
// Process any outstanding request outside a signal handler.
virtual void HandleSaveRequest() = 0;
// Start and stop sampler.
void Start();
void Stop();
// Is the sampler used for profiling?
bool IsProfiling() const { return profiling_; }
// Whether the sampler is running (that is, consumes resources).
bool IsActive() const { return active_; }
// Low overhead way to stop the sampler from ticking
bool IsPaused() const { return paused_; }
void SetPaused(bool value) { NoBarrier_Store(&paused_, value); }
class PlatformData;
PlatformData* platform_data() { return data_; }
// If we move the backtracing code into the platform files we won't
// need to have these hacks
#ifdef XP_WIN
// xxxehsan sucky hack :(
static uintptr_t GetThreadHandle(PlatformData*);
#endif
#ifdef XP_MACOSX
static pthread_t GetProfiledThread(PlatformData*);
#endif
private:
void SetActive(bool value) { NoBarrier_Store(&active_, value); }
const int interval_;
const bool profiling_;
Atomic32 paused_;
Atomic32 active_;
PlatformData* data_; // Platform specific data.
};