blob: 6e5491bff11801397e353cb371b1a9762fffb970 [file] [log] [blame]
// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "gin/public/v8_platform.h"
#include "base/bind.h"
#include "base/location.h"
#include "base/sys_info.h"
#include "base/threading/worker_pool.h"
#include "base/trace_event/trace_event.h"
#include "gin/per_isolate_data.h"
namespace gin {
namespace {
base::LazyInstance<V8Platform>::Leaky g_v8_platform = LAZY_INSTANCE_INITIALIZER;
void RunWithLocker(v8::Isolate* isolate, v8::Task* task) {
v8::Locker lock(isolate);
task->Run();
}
class IdleTaskWithLocker : public v8::IdleTask {
public:
IdleTaskWithLocker(v8::Isolate* isolate, v8::IdleTask* task)
: isolate_(isolate), task_(task) {}
~IdleTaskWithLocker() override = default;
// v8::IdleTask implementation.
void Run(double deadline_in_seconds) override {
v8::Locker lock(isolate_);
task_->Run(deadline_in_seconds);
}
private:
v8::Isolate* isolate_;
std::unique_ptr<v8::IdleTask> task_;
DISALLOW_COPY_AND_ASSIGN(IdleTaskWithLocker);
};
} // namespace
// static
V8Platform* V8Platform::Get() { return g_v8_platform.Pointer(); }
V8Platform::V8Platform() {}
V8Platform::~V8Platform() {}
size_t V8Platform::NumberOfAvailableBackgroundThreads() {
// WorkerPool will currently always create additional threads for posted
// background tasks, unless there are threads sitting idle (on posix).
// Indicate that V8 should create no more than the number of cores available,
// reserving one core for the main thread.
const size_t available_cores =
static_cast<size_t>(base::SysInfo::NumberOfProcessors());
if (available_cores > 1) {
return available_cores - 1;
}
return 1;
}
void V8Platform::CallOnBackgroundThread(
v8::Task* task,
v8::Platform::ExpectedRuntime expected_runtime) {
base::WorkerPool::PostTask(
FROM_HERE,
base::Bind(&v8::Task::Run, base::Owned(task)),
expected_runtime == v8::Platform::kLongRunningTask);
}
void V8Platform::CallOnForegroundThread(v8::Isolate* isolate, v8::Task* task) {
PerIsolateData* data = PerIsolateData::From(isolate);
if (data->access_mode() == IsolateHolder::kUseLocker) {
data->task_runner()->PostTask(
FROM_HERE, base::Bind(RunWithLocker, base::Unretained(isolate),
base::Owned(task)));
} else {
data->task_runner()->PostTask(
FROM_HERE, base::Bind(&v8::Task::Run, base::Owned(task)));
}
}
void V8Platform::CallDelayedOnForegroundThread(v8::Isolate* isolate,
v8::Task* task,
double delay_in_seconds) {
PerIsolateData* data = PerIsolateData::From(isolate);
if (data->access_mode() == IsolateHolder::kUseLocker) {
data->task_runner()->PostDelayedTask(
FROM_HERE,
base::Bind(RunWithLocker, base::Unretained(isolate), base::Owned(task)),
base::TimeDelta::FromSecondsD(delay_in_seconds));
} else {
data->task_runner()->PostDelayedTask(
FROM_HERE, base::Bind(&v8::Task::Run, base::Owned(task)),
base::TimeDelta::FromSecondsD(delay_in_seconds));
}
}
void V8Platform::CallIdleOnForegroundThread(v8::Isolate* isolate,
v8::IdleTask* task) {
PerIsolateData* data = PerIsolateData::From(isolate);
DCHECK(data->idle_task_runner());
if (data->access_mode() == IsolateHolder::kUseLocker) {
data->idle_task_runner()->PostIdleTask(
new IdleTaskWithLocker(isolate, task));
} else {
data->idle_task_runner()->PostIdleTask(task);
}
}
bool V8Platform::IdleTasksEnabled(v8::Isolate* isolate) {
return PerIsolateData::From(isolate)->idle_task_runner() != nullptr;
}
double V8Platform::MonotonicallyIncreasingTime() {
return base::TimeTicks::Now().ToInternalValue() /
static_cast<double>(base::Time::kMicrosecondsPerSecond);
}
const uint8_t* V8Platform::GetCategoryGroupEnabled(const char* name) {
return TRACE_EVENT_API_GET_CATEGORY_GROUP_ENABLED(name);
}
const char* V8Platform::GetCategoryGroupName(
const uint8_t* category_enabled_flag) {
return base::trace_event::TraceLog::GetCategoryGroupName(
category_enabled_flag);
}
namespace {
class ConvertableToTraceFormatWrapper
: public base::trace_event::ConvertableToTraceFormat {
public:
explicit ConvertableToTraceFormatWrapper(
std::unique_ptr<v8::ConvertableToTraceFormat>& inner)
: inner_(std::move(inner)) {}
~ConvertableToTraceFormatWrapper() override = default;
void AppendAsTraceFormat(std::string* out) const final {
inner_->AppendAsTraceFormat(out);
}
private:
std::unique_ptr<v8::ConvertableToTraceFormat> inner_;
DISALLOW_COPY_AND_ASSIGN(ConvertableToTraceFormatWrapper);
};
} // namespace
uint64_t V8Platform::AddTraceEvent(
char phase,
const uint8_t* category_enabled_flag,
const char* name,
const char* scope,
uint64_t id,
uint64_t bind_id,
int32_t num_args,
const char** arg_names,
const uint8_t* arg_types,
const uint64_t* arg_values,
std::unique_ptr<v8::ConvertableToTraceFormat>* arg_convertables,
unsigned int flags) {
std::unique_ptr<base::trace_event::ConvertableToTraceFormat> convertables[2];
if (num_args > 0 && arg_types[0] == TRACE_VALUE_TYPE_CONVERTABLE) {
convertables[0].reset(
new ConvertableToTraceFormatWrapper(arg_convertables[0]));
}
if (num_args > 1 && arg_types[1] == TRACE_VALUE_TYPE_CONVERTABLE) {
convertables[1].reset(
new ConvertableToTraceFormatWrapper(arg_convertables[1]));
}
DCHECK_LE(num_args, 2);
base::trace_event::TraceEventHandle handle =
TRACE_EVENT_API_ADD_TRACE_EVENT_WITH_BIND_ID(
phase, category_enabled_flag, name, scope, id, bind_id, num_args,
arg_names, arg_types, (const long long unsigned int*)arg_values,
convertables, flags);
uint64_t result;
memcpy(&result, &handle, sizeof(result));
return result;
}
void V8Platform::UpdateTraceEventDuration(const uint8_t* category_enabled_flag,
const char* name,
uint64_t handle) {
base::trace_event::TraceEventHandle traceEventHandle;
memcpy(&traceEventHandle, &handle, sizeof(handle));
TRACE_EVENT_API_UPDATE_TRACE_EVENT_DURATION(category_enabled_flag, name,
traceEventHandle);
}
namespace {
class EnabledStateObserverImpl final
: public base::trace_event::TraceLog::EnabledStateObserver {
public:
EnabledStateObserverImpl() = default;
void OnTraceLogEnabled() final {
base::AutoLock lock(mutex_);
for (auto o : observers_) {
o->OnTraceEnabled();
}
}
void OnTraceLogDisabled() final {
base::AutoLock lock(mutex_);
for (auto o : observers_) {
o->OnTraceDisabled();
}
}
void AddObserver(v8::Platform::TraceStateObserver* observer) {
base::AutoLock lock(mutex_);
DCHECK(!observers_.count(observer));
observers_.insert(observer);
if (observers_.size() == 1) {
base::trace_event::TraceLog::GetInstance()->AddEnabledStateObserver(this);
}
}
void RemoveObserver(v8::Platform::TraceStateObserver* observer) {
base::AutoLock lock(mutex_);
DCHECK(observers_.count(observer) == 1);
observers_.erase(observer);
if (observers_.empty()) {
base::trace_event::TraceLog::GetInstance()->RemoveEnabledStateObserver(
this);
}
}
private:
base::Lock mutex_;
std::unordered_set<v8::Platform::TraceStateObserver*> observers_;
DISALLOW_COPY_AND_ASSIGN(EnabledStateObserverImpl);
};
base::LazyInstance<EnabledStateObserverImpl>::Leaky g_trace_state_dispatcher =
LAZY_INSTANCE_INITIALIZER;
} // namespace
void V8Platform::AddTraceStateObserver(
v8::Platform::TraceStateObserver* observer) {
g_trace_state_dispatcher.Get().AddObserver(observer);
}
void V8Platform::RemoveTraceStateObserver(
v8::Platform::TraceStateObserver* observer) {
g_trace_state_dispatcher.Get().RemoveObserver(observer);
}
} // namespace gin