| /* |
| * 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_MOZJS_USER_OBJECT_HOLDER_H_ |
| #define COBALT_SCRIPT_MOZJS_MOZJS_USER_OBJECT_HOLDER_H_ |
| |
| #include "base/hash_tables.h" |
| #include "base/memory/weak_ptr.h" |
| #include "cobalt/base/polymorphic_downcast.h" |
| #include "cobalt/script/mozjs/mozjs_global_environment.h" |
| #include "cobalt/script/mozjs/referenced_object_map.h" |
| #include "cobalt/script/mozjs/wrapper_factory.h" |
| #include "cobalt/script/mozjs/wrapper_private.h" |
| #include "cobalt/script/script_object.h" |
| #include "third_party/mozjs/js/src/jsapi.h" |
| |
| namespace cobalt { |
| namespace script { |
| namespace mozjs { |
| |
| // Template class that implements the ScriptObject template class for lifetime |
| // management of User Objects passed from the bindings layer into Cobalt. See |
| // the definition of ScriptObject for further detail. |
| // This class does not root the underlying JSObject that MozjsUserObjectType |
| // holds a reference to. The object will be traced when any owning objects are |
| // traced. |
| template <typename MozjsUserObjectType> |
| class MozjsUserObjectHolder |
| : public ScriptObject<typename MozjsUserObjectType::BaseType> { |
| public: |
| typedef ScriptObject<typename MozjsUserObjectType::BaseType> BaseClass; |
| |
| MozjsUserObjectHolder() : context_(NULL), wrapper_factory_(NULL) {} |
| |
| MozjsUserObjectHolder(JS::HandleObject object, JSContext* context, |
| WrapperFactory* wrapper_factory) |
| : object_handle_(MozjsUserObjectType(context, object)), |
| context_(context), |
| wrapper_factory_(wrapper_factory) {} |
| |
| void RegisterOwner(Wrappable* owner) OVERRIDE { |
| JS::RootedObject owned_object(context_, js_object()); |
| DLOG_IF(WARNING, !owned_object) |
| << "Owned object has been garbage collected."; |
| if (owned_object) { |
| MozjsGlobalEnvironment* global_environment = |
| MozjsGlobalEnvironment::GetFromContext(context_); |
| intptr_t key = ReferencedObjectMap::GetKeyForWrappable(owner); |
| global_environment->referenced_objects()->AddReferencedObject( |
| key, owned_object); |
| } |
| } |
| |
| void DeregisterOwner(Wrappable* owner) OVERRIDE { |
| // |owner| may be in the process of being destructed, so don't use it. |
| JS::RootedObject owned_object(context_, js_object()); |
| if (owned_object) { |
| MozjsGlobalEnvironment* global_environment = |
| MozjsGlobalEnvironment::GetFromContext(context_); |
| intptr_t key = ReferencedObjectMap::GetKeyForWrappable(owner); |
| global_environment->referenced_objects()->RemoveReferencedObject( |
| key, owned_object); |
| } |
| } |
| |
| const typename MozjsUserObjectType::BaseType* GetScriptObject() |
| const OVERRIDE { |
| return object_handle_ ? &object_handle_.value() : NULL; |
| } |
| |
| scoped_ptr<BaseClass> MakeCopy() const OVERRIDE { |
| DCHECK(object_handle_); |
| JS::RootedObject rooted_object(context_, js_object()); |
| return make_scoped_ptr<BaseClass>( |
| new MozjsUserObjectHolder(rooted_object, context_, wrapper_factory_)); |
| } |
| |
| bool EqualTo(const BaseClass& other) const OVERRIDE { |
| const MozjsUserObjectHolder* mozjs_other = |
| base::polymorphic_downcast<const MozjsUserObjectHolder*>(&other); |
| if (!object_handle_) { |
| return !mozjs_other->object_handle_; |
| } |
| DCHECK(object_handle_); |
| DCHECK(mozjs_other->object_handle_); |
| return object_handle_->handle() == mozjs_other->object_handle_->handle(); |
| } |
| |
| JSObject* js_object() const { |
| DCHECK(object_handle_); |
| return object_handle_->handle(); |
| } |
| |
| private: |
| typedef base::hash_map<const Wrappable*, base::WeakPtr<WrapperPrivate> > |
| WrappableAndPrivateHashMap; |
| |
| JSContext* context_; |
| base::optional<MozjsUserObjectType> object_handle_; |
| WrapperFactory* wrapper_factory_; |
| }; |
| |
| } // namespace mozjs |
| } // namespace script |
| } // namespace cobalt |
| |
| #endif // COBALT_SCRIPT_MOZJS_MOZJS_USER_OBJECT_HOLDER_H_ |