blob: 178f66bf4385af65e820eab9401e0342ce818f6c [file] [log] [blame]
/*
* Copyright 2014 Google Inc. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "cobalt/script/javascriptcore/jsc_engine.h"
#include "base/logging.h"
#include "base/memory/singleton.h"
#include "base/message_loop.h"
#include "base/synchronization/lock.h"
#include "base/time.h"
#include "cobalt/base/c_val.h"
#include "cobalt/script/javascriptcore/jsc_global_environment.h"
#include "cobalt/script/javascriptcore/jsc_global_object.h"
#include "third_party/WebKit/Source/JavaScriptCore/runtime/InitializeThreading.h"
#include "third_party/WebKit/Source/WTF/wtf/OSAllocator.h"
namespace cobalt {
namespace script {
namespace javascriptcore {
namespace {
class JSCEngineStats {
public:
JSCEngineStats();
static JSCEngineStats* GetInstance() {
return Singleton<JSCEngineStats,
StaticMemorySingletonTraits<JSCEngineStats> >::get();
}
void JSCEngineCreated() {
base::AutoLock auto_lock(lock_);
++js_engine_count_;
}
void JSCEngineDestroyed() {
base::AutoLock auto_lock(lock_);
--js_engine_count_;
}
size_t UpdateMemoryStatsAndReturnReserved() {
base::AutoLock auto_lock(lock_);
if (js_engine_count_.value() == 0) {
return 0;
}
return OSAllocator::getCurrentBytesAllocated();
}
private:
friend struct StaticMemorySingletonTraits<JSCEngineStats>;
base::Lock lock_;
base::CVal<size_t> js_engine_count_;
};
JSCEngineStats::JSCEngineStats()
: js_engine_count_("Count.JS.Engine", 0,
"Total JavaScript engine registered.") {}
} // namespace
JSCEngine::JSCEngine() {
global_data_ = JSC::JSGlobalData::create(JSC::LargeHeap);
JSCEngineStats::GetInstance()->JSCEngineCreated();
}
JSCEngine::~JSCEngine() {
DCHECK(thread_checker_.CalledOnValidThread());
JSCEngineStats::GetInstance()->JSCEngineDestroyed();
script_object_registry_.ClearEntries();
}
scoped_refptr<GlobalEnvironment> JSCEngine::CreateGlobalEnvironment() {
DCHECK(thread_checker_.CalledOnValidThread());
return new JSCGlobalEnvironment(this);
}
void JSCEngine::CollectGarbage() {
DCHECK(thread_checker_.CalledOnValidThread());
JSC::JSLockHolder lock(global_data_.get());
DCHECK(global_data_->heap.isSafeToCollect());
global_data_->heap.collectAllGarbage();
}
void JSCEngine::ReportExtraMemoryCost(size_t bytes) {
DCHECK(thread_checker_.CalledOnValidThread());
JSC::JSLockHolder lock(global_data_.get());
global_data_->heap.reportExtraMemoryCost(bytes);
}
size_t JSCEngine::UpdateMemoryStatsAndReturnReserved() {
return JSCEngineStats::GetInstance()->UpdateMemoryStatsAndReturnReserved();
}
} // namespace javascriptcore
scoped_ptr<JavaScriptEngine> JavaScriptEngine::CreateEngine() {
// Documentation in InitializeThreading.h states this function should be
// called from the main thread. However, calling it here from the thread each
// engine is created on appears to show no difference in practice.
JSC::initializeThreading();
// There must be at most one JSGlobalData instance created per thread.
scoped_ptr<javascriptcore::JSCEngine> engine(new javascriptcore::JSCEngine());
// Global data should be of Default type - one per thread.
DCHECK(!engine->global_data()->usingAPI());
return engine.PassAs<JavaScriptEngine>();
}
} // namespace script
} // namespace cobalt