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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_WEAK_HEAP_OBJECT_MANAGER_H_
#define COBALT_SCRIPT_MOZJS_WEAK_HEAP_OBJECT_MANAGER_H_
#include "base/hash_tables.h"
namespace cobalt {
namespace script {
namespace mozjs {
class WeakHeapObject;
// WeakHeapObjectManager holds a reference to all WeakHeapObject instances. The
// SweepUnmarkedObjects function should be called during garbage collection
// after the marking phase. The underlying JS::Heap<> handle for any unmarked
// handles will be set to NULL.
class WeakHeapObjectManager {
public:
// Iterates over all WeakHeapObjects and sets their JS::Heap<> handles to NULL
// if the objects to which they hold a reference are about to be finalized.
void SweepUnmarkedObjects();
~WeakHeapObjectManager();
private:
void StartTracking(WeakHeapObject* weak_object);
void StopTracking(WeakHeapObject* weak_object);
// Returns true if the underlying pointer is NULL, which will be the case if
// the object has been swept.
bool MaybeSweep(WeakHeapObject* weak_object);
typedef base::hash_set<WeakHeapObject*> WeakHeapObjects;
WeakHeapObjects weak_objects_;
friend class WeakHeapObject;
};
} // namespace mozjs
} // namespace script
} // namespace cobalt
#endif // COBALT_SCRIPT_MOZJS_WEAK_HEAP_OBJECT_MANAGER_H_