| // Copyright 2014 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "config.h" |
| #include "bindings/core/v8/ScriptWrappable.h" |
| |
| #include "bindings/core/v8/DOMDataStore.h" |
| #include "bindings/core/v8/V8DOMWrapper.h" |
| |
| namespace blink { |
| |
| #if COMPILER(MSVC) |
| __declspec(align(4)) |
| #endif |
| struct SameSizeAsScriptWrappableBase { }; |
| |
| COMPILE_ASSERT(sizeof(ScriptWrappableBase) <= sizeof(SameSizeAsScriptWrappableBase), ScriptWrappableBase_should_stay_small); |
| |
| struct SameSizeAsScriptWrappable : public ScriptWrappableBase { |
| virtual ~SameSizeAsScriptWrappable() { } |
| v8::Object* m_wrapper; |
| }; |
| |
| COMPILE_ASSERT(sizeof(ScriptWrappable) <= sizeof(SameSizeAsScriptWrappable), ScriptWrappable_should_stay_small); |
| |
| namespace { |
| |
| class ScriptWrappableBaseProtector final { |
| WTF_MAKE_NONCOPYABLE(ScriptWrappableBaseProtector); |
| public: |
| ScriptWrappableBaseProtector(ScriptWrappableBase* scriptWrappableBase, const WrapperTypeInfo* wrapperTypeInfo) |
| : m_scriptWrappableBase(scriptWrappableBase), m_wrapperTypeInfo(wrapperTypeInfo) |
| { |
| m_wrapperTypeInfo->refObject(m_scriptWrappableBase); |
| } |
| ~ScriptWrappableBaseProtector() |
| { |
| m_wrapperTypeInfo->derefObject(m_scriptWrappableBase); |
| } |
| |
| private: |
| ScriptWrappableBase* m_scriptWrappableBase; |
| const WrapperTypeInfo* m_wrapperTypeInfo; |
| }; |
| |
| } // namespace |
| |
| v8::Handle<v8::Object> ScriptWrappable::wrap(v8::Handle<v8::Object> creationContext, v8::Isolate* isolate) |
| { |
| const WrapperTypeInfo* wrapperTypeInfo = this->wrapperTypeInfo(); |
| |
| // It's possible that no one except for the new wrapper owns this object at |
| // this moment, so we have to prevent GC to collect this object until the |
| // object gets associated with the wrapper. |
| ScriptWrappableBaseProtector protect(this, wrapperTypeInfo); |
| |
| ASSERT(!DOMDataStore::containsWrapperNonTemplate(this, isolate)); |
| |
| v8::Handle<v8::Object> wrapper = V8DOMWrapper::createWrapper(creationContext, wrapperTypeInfo, toScriptWrappableBase(), isolate); |
| if (UNLIKELY(wrapper.IsEmpty())) |
| return wrapper; |
| |
| wrapperTypeInfo->installConditionallyEnabledProperties(wrapper, isolate); |
| return associateWithWrapper(wrapperTypeInfo, wrapper, isolate); |
| } |
| |
| v8::Handle<v8::Object> ScriptWrappable::associateWithWrapper(const WrapperTypeInfo* wrapperTypeInfo, v8::Handle<v8::Object> wrapper, v8::Isolate* isolate) |
| { |
| return V8DOMWrapper::associateObjectWithWrapperNonTemplate(this, wrapperTypeInfo, wrapper, isolate); |
| } |
| |
| } // namespace blink |