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// 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.
#ifndef COBALT_SCRIPT_MOZJS_45_MOZJS_ENGINE_H_
#define COBALT_SCRIPT_MOZJS_45_MOZJS_ENGINE_H_
#include <vector>
#include "base/threading/thread_checker.h"
#include "base/timer.h"
#include "cobalt/script/javascript_engine.h"
#include "third_party/mozjs-45/js/src/jsapi.h"
namespace cobalt {
namespace script {
namespace mozjs {
class MozjsEngine : public JavaScriptEngine {
public:
explicit MozjsEngine(const Options& options);
~MozjsEngine() override;
scoped_refptr<GlobalEnvironment> CreateGlobalEnvironment() override;
void CollectGarbage() override;
void AdjustAmountOfExternalAllocatedMemory(int64_t bytes) override;
bool RegisterErrorHandler(ErrorHandler handler) override;
void SetGcThreshold(int64_t bytes) override;
HeapStatistics GetHeapStatistics() override;
private:
static bool ContextCallback(JSContext* context, unsigned context_op,
void* data);
static void GCCallback(JSRuntime* runtime, JSGCStatus status, void* data);
static void FinalizeCallback(JSFreeOp* free_op, JSFinalizeStatus status,
bool is_compartment, void* data);
base::ThreadChecker thread_checker_;
// Top-level object that represents the JavaScript engine.
JSRuntime* runtime_;
// The sole context created for this JSRuntime.
JSContext* context_ = nullptr;
// The amount of externally allocated memory since the last GC, regardless of
// whether it was forced by us. Once this value exceeds
// |options_.gc_threshold_bytes|, we will force a garbage collection, and set
// this value back to 0. Note that there is no guarantee that the allocations
// that incremented this value will have actually been collected. Also note
// that this value is only incremented, never decremented, as it makes for a
// better force garbage collection heuristic.
int64_t force_gc_heuristic_ = 0;
// Used to handle JavaScript errors.
ErrorHandler error_handler_;
Options options_;
};
} // namespace mozjs
} // namespace script
} // namespace cobalt
#endif // COBALT_SCRIPT_MOZJS_45_MOZJS_ENGINE_H_