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// 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;
} // 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::From(isolate)->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::From(isolate)->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) {
DCHECK(PerIsolateData::From(isolate)->idle_task_runner());
PerIsolateData::From(isolate)->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);
}
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,
unsigned int flags) {
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, NULL,
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 gin
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