gecko/tools/profiler/platform-macos.cc

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2012-05-21 04:12:37 -07:00
/* 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/. */
#include <dlfcn.h>
#include <unistd.h>
#include <sys/mman.h>
#include <mach/mach_init.h>
#include <mach-o/dyld.h>
#include <mach-o/getsect.h>
#include <AvailabilityMacros.h>
#include <pthread.h>
#include <semaphore.h>
#include <signal.h>
#include <libkern/OSAtomic.h>
#include <mach/mach.h>
#include <mach/semaphore.h>
#include <mach/task.h>
#include <mach/vm_statistics.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/types.h>
#include <sys/sysctl.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "platform.h"
// this port is based off of v8 svn revision 9837
// XXX: this is a very stubbed out implementation
// that only supports a single Sampler
struct SamplerRegistry {
static void AddActiveSampler(Sampler *sampler) {
ASSERT(!SamplerRegistry::sampler);
SamplerRegistry::sampler = sampler;
}
static void RemoveActiveSampler(Sampler *sampler) {
SamplerRegistry::sampler = NULL;
}
static Sampler *sampler;
};
Sampler *SamplerRegistry::sampler = NULL;
// 0 is never a valid thread id on MacOSX since a ptread_t is
// a pointer.
static const pthread_t kNoThread = (pthread_t) 0;
class MacOSMutex : public Mutex {
public:
MacOSMutex() {
pthread_mutexattr_t attr;
pthread_mutexattr_init(&attr);
pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
pthread_mutex_init(&mutex_, &attr);
}
virtual ~MacOSMutex() { pthread_mutex_destroy(&mutex_); }
virtual int Lock() { return pthread_mutex_lock(&mutex_); }
virtual int Unlock() { return pthread_mutex_unlock(&mutex_); }
virtual bool TryLock() {
int result = pthread_mutex_trylock(&mutex_);
// Return false if the lock is busy and locking failed.
if (result == EBUSY) {
return false;
}
ASSERT(result == 0); // Verify no other errors.
return true;
}
private:
pthread_mutex_t mutex_;
};
Mutex* OS::CreateMutex() {
return new MacOSMutex();
}
void OS::Sleep(int milliseconds) {
usleep(1000 * milliseconds);
}
class Thread::PlatformData : public Malloced {
public:
PlatformData() : thread_(kNoThread) {}
pthread_t thread_; // Thread handle for pthread.
};
Thread::Thread(const char* name)
: data_(new PlatformData),
stack_size_(0) {
set_name(name);
}
Thread::~Thread() {
delete data_;
}
static void SetThreadName(const char* name) {
// pthread_setname_np is only available in 10.6 or later, so test
// for it at runtime.
int (*dynamic_pthread_setname_np)(const char*);
*reinterpret_cast<void**>(&dynamic_pthread_setname_np) =
dlsym(RTLD_DEFAULT, "pthread_setname_np");
if (!dynamic_pthread_setname_np)
return;
// Mac OS X does not expose the length limit of the name, so hardcode it.
static const int kMaxNameLength = 63;
USE(kMaxNameLength);
ASSERT(Thread::kMaxThreadNameLength <= kMaxNameLength);
dynamic_pthread_setname_np(name);
}
static void* ThreadEntry(void* arg) {
Thread* thread = reinterpret_cast<Thread*>(arg);
// This is also initialized by the first argument to pthread_create() but we
// don't know which thread will run first (the original thread or the new
// one) so we initialize it here too.
thread->data()->thread_ = pthread_self();
SetThreadName(thread->name());
ASSERT(thread->data()->thread_ != kNoThread);
thread->Run();
return NULL;
}
void Thread::set_name(const char* name) {
strncpy(name_, name, sizeof(name_));
name_[sizeof(name_) - 1] = '\0';
}
void Thread::Start() {
pthread_attr_t* attr_ptr = NULL;
pthread_attr_t attr;
if (stack_size_ > 0) {
pthread_attr_init(&attr);
pthread_attr_setstacksize(&attr, static_cast<size_t>(stack_size_));
attr_ptr = &attr;
}
pthread_create(&data_->thread_, attr_ptr, ThreadEntry, this);
ASSERT(data_->thread_ != kNoThread);
}
void Thread::Join() {
pthread_join(data_->thread_, NULL);
}
class Sampler::PlatformData : public Malloced {
public:
PlatformData() : profiled_thread_(mach_thread_self())
{
profiled_pthread_ = pthread_from_mach_thread_np(profiled_thread_);
}
~PlatformData() {
// Deallocate Mach port for thread.
mach_port_deallocate(mach_task_self(), profiled_thread_);
}
thread_act_t profiled_thread() { return profiled_thread_; }
pthread_t profiled_pthread() { return profiled_pthread_; }
private:
// Note: for profiled_thread_ Mach primitives are used instead of PThread's
// because the latter doesn't provide thread manipulation primitives required.
// For details, consult "Mac OS X Internals" book, Section 7.3.
thread_act_t profiled_thread_;
// we also store the pthread because Mach threads have no concept of stack
// and we want to be able to get the stack size when we need to unwind the
// stack using frame pointers.
pthread_t profiled_pthread_;
};
class SamplerThread : public Thread {
public:
explicit SamplerThread(int interval)
: Thread("SamplerThread"),
interval_(interval) {}
static void AddActiveSampler(Sampler* sampler) {
ScopedLock lock(mutex_);
SamplerRegistry::AddActiveSampler(sampler);
if (instance_ == NULL) {
instance_ = new SamplerThread(sampler->interval());
instance_->Start();
} else {
ASSERT(instance_->interval_ == sampler->interval());
}
}
static void RemoveActiveSampler(Sampler* sampler) {
ScopedLock lock(mutex_);
instance_->Join();
//XXX: unlike v8 we need to remove the active sampler after doing the Join
// because we drop the sampler immediately
SamplerRegistry::RemoveActiveSampler(sampler);
delete instance_;
instance_ = NULL;
/*
if (SamplerRegistry::GetState() == SamplerRegistry::HAS_NO_SAMPLERS) {
RuntimeProfiler::StopRuntimeProfilerThreadBeforeShutdown(instance_);
delete instance_;
instance_ = NULL;
}
*/
}
// Implement Thread::Run().
virtual void Run() {
while (SamplerRegistry::sampler->IsActive()) {
if (!SamplerRegistry::sampler->IsPaused())
SampleContext(SamplerRegistry::sampler);
OS::Sleep(interval_);
}
}
void SampleContext(Sampler* sampler) {
thread_act_t profiled_thread = sampler->platform_data()->profiled_thread();
TickSample sample_obj;
TickSample* sample = &sample_obj;
//TickSample* sample = CpuProfiler::TickSampleEvent(sampler->isolate());
//if (sample == NULL) sample = &sample_obj;
if (KERN_SUCCESS != thread_suspend(profiled_thread)) return;
#if V8_HOST_ARCH_X64
thread_state_flavor_t flavor = x86_THREAD_STATE64;
x86_thread_state64_t state;
mach_msg_type_number_t count = x86_THREAD_STATE64_COUNT;
#if __DARWIN_UNIX03
#define REGISTER_FIELD(name) __r ## name
#else
#define REGISTER_FIELD(name) r ## name
#endif // __DARWIN_UNIX03
#elif V8_HOST_ARCH_IA32
thread_state_flavor_t flavor = i386_THREAD_STATE;
i386_thread_state_t state;
mach_msg_type_number_t count = i386_THREAD_STATE_COUNT;
#if __DARWIN_UNIX03
#define REGISTER_FIELD(name) __e ## name
#else
#define REGISTER_FIELD(name) e ## name
#endif // __DARWIN_UNIX03
#else
#error Unsupported Mac OS X host architecture.
#endif // V8_HOST_ARCH
if (thread_get_state(profiled_thread,
flavor,
reinterpret_cast<natural_t*>(&state),
&count) == KERN_SUCCESS) {
//sample->state = sampler->isolate()->current_vm_state();
sample->pc = reinterpret_cast<Address>(state.REGISTER_FIELD(ip));
sample->sp = reinterpret_cast<Address>(state.REGISTER_FIELD(sp));
sample->fp = reinterpret_cast<Address>(state.REGISTER_FIELD(bp));
sample->timestamp = mozilla::TimeStamp::Now();
sampler->SampleStack(sample);
sampler->Tick(sample);
}
thread_resume(profiled_thread);
}
const int interval_;
//RuntimeProfilerRateLimiter rate_limiter_;
// Protects the process wide state below.
static Mutex* mutex_;
static SamplerThread* instance_;
DISALLOW_COPY_AND_ASSIGN(SamplerThread);
};
#undef REGISTER_FIELD
Mutex* SamplerThread::mutex_ = OS::CreateMutex();
SamplerThread* SamplerThread::instance_ = NULL;
Sampler::Sampler(int interval, bool profiling)
: // isolate_(isolate),
interval_(interval),
profiling_(profiling),
paused_(false),
active_(false) /*,
samples_taken_(0)*/ {
data_ = new PlatformData;
}
Sampler::~Sampler() {
ASSERT(!IsActive());
delete data_;
}
void Sampler::Start() {
ASSERT(!IsActive());
SetActive(true);
SamplerThread::AddActiveSampler(this);
}
void Sampler::Stop() {
ASSERT(IsActive());
SetActive(false);
SamplerThread::RemoveActiveSampler(this);
}
pthread_t
Sampler::GetProfiledThread(Sampler::PlatformData* aData)
{
return aData->profiled_pthread();
}