blob: 23444fa348456985035dad30ac83861c71f69380 [file] [log] [blame]
/*
* Copyright 2016 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/mozjs/mozjs_engine.h"
#include <algorithm>
#include "base/logging.h"
#include "cobalt/script/mozjs/mozjs_global_object_proxy.h"
#include "third_party/mozjs/js/src/jsapi.h"
namespace cobalt {
namespace script {
namespace mozjs {
namespace {
// After this many bytes have been allocated, the garbage collector will run.
const uint32_t kGarbageCollectionThresholdBytes = 8 * 1024 * 1024;
}
MozjsEngine::MozjsEngine() {
// TODO: Investigate the benefit of helper threads and things like
// parallel compilation.
runtime_ =
JS_NewRuntime(kGarbageCollectionThresholdBytes, JS_NO_HELPER_THREADS);
CHECK(runtime_);
JS_SetRuntimePrivate(runtime_, this);
// Use incremental garbage collection.
JS_SetGCParameter(runtime_, JSGC_MODE, JSGC_MODE_INCREMENTAL);
// Allow Spidermonkey to allocate as much memory as it needs. If this limit
// is set we could limit the memory used by JS and "gracefully" restart,
// for example.
JS_SetGCParameter(runtime_, JSGC_MAX_BYTES, 0xffffffff);
// Callback to be called whenever a JSContext is created or destroyed for this
// JSRuntime.
JS_SetContextCallback(runtime_, &MozjsEngine::ContextCallback);
// Callback to be called during garbage collection during the sweep phase.
JS_SetFinalizeCallback(runtime_, &MozjsEngine::FinalizeCallback);
}
MozjsEngine::~MozjsEngine() {
DCHECK(thread_checker_.CalledOnValidThread());
JS_DestroyRuntime(runtime_);
}
scoped_refptr<GlobalObjectProxy> MozjsEngine::CreateGlobalObjectProxy() {
DCHECK(thread_checker_.CalledOnValidThread());
return new MozjsGlobalObjectProxy(runtime_);
}
void MozjsEngine::CollectGarbage() {
DCHECK(thread_checker_.CalledOnValidThread());
JS_GC(runtime_);
}
void MozjsEngine::ReportExtraMemoryCost(size_t bytes) { NOTIMPLEMENTED(); }
JSBool MozjsEngine::ContextCallback(JSContext* context, unsigned context_op) {
JSRuntime* runtime = JS_GetRuntime(context);
MozjsEngine* engine =
static_cast<MozjsEngine*>(JS_GetRuntimePrivate(runtime));
DCHECK(engine->thread_checker_.CalledOnValidThread());
if (context_op == JSCONTEXT_NEW) {
engine->contexts_.push_back(context);
} else if (context_op == JSCONTEXT_DESTROY) {
ContextVector::iterator it =
std::find(engine->contexts_.begin(), engine->contexts_.end(), context);
if (it != engine->contexts_.end()) {
engine->contexts_.erase(it);
}
}
return true;
}
void MozjsEngine::FinalizeCallback(JSFreeOp* free_op, JSFinalizeStatus status,
JSBool is_compartment) {
MozjsEngine* engine =
static_cast<MozjsEngine*>(JS_GetRuntimePrivate(free_op->runtime()));
DCHECK(engine->thread_checker_.CalledOnValidThread());
if (status == JSFINALIZE_GROUP_START) {
for (int i = 0; i < engine->contexts_.size(); ++i) {
MozjsGlobalObjectProxy* global_environment =
MozjsGlobalObjectProxy::GetFromContext(engine->contexts_[i]);
global_environment->DoSweep();
}
}
}
} // namespace mozjs
scoped_ptr<JavaScriptEngine> JavaScriptEngine::CreateEngine() {
return make_scoped_ptr<JavaScriptEngine>(new mozjs::MozjsEngine());
}
} // namespace script
} // namespace cobalt