| // 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_REFERENCED_OBJECT_MAP_H_ |
| #define COBALT_SCRIPT_MOZJS_45_REFERENCED_OBJECT_MAP_H_ |
| |
| #include "base/hash_tables.h" |
| #include "base/threading/thread_checker.h" |
| #include "cobalt/script/mozjs-45/weak_heap_object.h" |
| #include "cobalt/script/wrappable.h" |
| #include "third_party/mozjs-45/js/src/jsapi.h" |
| |
| namespace cobalt { |
| namespace script { |
| namespace mozjs { |
| |
| // Maintains a set of JSObjects that are reachable from a given object. This |
| // relationship is registered by mapping a key to a JSObject. The calling code |
| // should ensure that a key uniquely identifies the entity that holds a |
| // reference to the JSObjects. |
| // During garbage collection, supply a key to TraceReferencedObjects to trace |
| // all objects that are registered as being reachable from the object |
| // represented by that key. |
| class ReferencedObjectMap { |
| public: |
| explicit ReferencedObjectMap(JSContext* context); |
| |
| // Reinterpret the pointer as an integer to be used as a key for tracking |
| // referenced objects. |
| static intptr_t GetKeyForWrappable(const Wrappable* wrappable) { |
| return reinterpret_cast<intptr_t>(wrappable); |
| } |
| |
| void AddReferencedObject(intptr_t key, JS::HandleValue referee); |
| void RemoveReferencedObject(intptr_t key, JS::HandleValue referee); |
| |
| // Trace all objects referenced from this WrapperPrivate*. |
| void TraceReferencedObjects(JSTracer* trace, intptr_t key); |
| |
| // Remove any referenced objects that are NULL. It may be the case that a |
| // weak reference to an object was garbage collected, so remove it from the |
| // internal list. |
| void RemoveNullReferences(); |
| |
| private: |
| typedef base::hash_multimap<intptr_t, WeakHeapObject> |
| ReferencedObjectMultiMap; |
| |
| base::ThreadChecker thread_checker_; |
| JSContext* context_; |
| ReferencedObjectMultiMap referenced_objects_; |
| }; |
| |
| } // namespace mozjs |
| } // namespace script |
| } // namespace cobalt |
| |
| #endif // COBALT_SCRIPT_MOZJS_45_REFERENCED_OBJECT_MAP_H_ |