chromium中綁定JavaScript層級中的頂層對象Window到v8中的入口

//chromium中綁定JavaScript 層級中的頂層對象Window到v8中的入口<br />bool V8DOMWindowShell::installDOMWindow(v8::Handle<v8::Context> context, DOMWindow* window)<br />{<br /> //建立一個JS window對象<br /> v8::Handle<v8::Function> windowConstructor = V8DOMWrapper::getConstructor(&V8DOMWindow::info, getHiddenObjectPrototype(context));<br /> v8::Local<v8::Object> jsWindow = SafeAllocation::newInstance(windowConstructor);<br /> // Bail out if allocation failed.<br /> if (jsWindow.IsEmpty())<br /> return false;<br /> //把c++對象DOMWindow打包到JS window對象的內部資料域<br /> V8DOMWrapper::setDOMWrapper(jsWindow, &V8DOMWindow::info, window);<br /> //把c++對象DOMWindow打包到JS window對象的原型的內部資料域<br /> V8DOMWrapper::setDOMWrapper(v8::Handle<v8::Object>::Cast(jsWindow->GetPrototype()), &V8DOMWindow::info, window);<br /> window->ref();<br /> V8DOMWrapper::setJSWrapperForDOMObject(window, v8::Persistent<v8::Object>::New(jsWindow));<br /> v8::Handle<v8::Object> v8RealGlobal = v8::Handle<v8::Object>::Cast(context->Global()->GetPrototype());<br /> //把c++對象DOMWindow打包到JS 全域對象的內部資料域<br /> V8DOMWrapper::setDOMWrapper(v8RealGlobal, &V8DOMWindow::info, window);<br /> //將JS window對象設定為JS全域對象的原型，v8RealGlobal即為jsWindow的shadow object<br /> v8RealGlobal->SetPrototype(jsWindow);<br /> return true;<br />}<br />// Sets contents of a DOM wrapper.<br />static void setDOMWrapper(v8::Handle<v8::Object> object, WrapperTypeInfo* type, void* cptr)<br />{<br /> ASSERT(object->InternalFieldCount() >= 2);<br /> object->SetPointerInInternalField(v8DOMWrapperObjectIndex, cptr);<br /> object->SetPointerInInternalField(v8DOMWrapperTypeIndex, type);<br />}