/* * Copyright (C) 2012 Google Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are * met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following disclaimer * in the documentation and/or other materials provided with the * distribution. * * Neither the name of Google Inc. nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #ifndef V8BindingPerContextData_h #define V8BindingPerContextData_h #include "OwnHandle.h" #include "WrapperTypeInfo.h" #include <v8.h> #include <wtf/HashMap.h> #include <wtf/PassOwnPtr.h> namespace WebCore { class V8BindingPerContextData { public: static PassOwnPtr<V8BindingPerContextData> create(v8::Handle<v8::Context> context) { return adoptPtr(new V8BindingPerContextData(context)); } ~V8BindingPerContextData() { dispose(); } bool init(); // To create JS Wrapper objects, we create a cache of a 'boiler plate' // object, and then simply Clone that object each time we need a new one. // This is faster than going through the full object creation process. v8::Local<v8::Object> createWrapperFromCache(WrapperTypeInfo* type) { v8::Persistent<v8::Object> boilerplate = m_wrapperBoilerplates.get(type); return !boilerplate.IsEmpty() ? boilerplate->Clone() : createWrapperFromCacheSlowCase(type); } v8::Local<v8::Function> constructorForType(WrapperTypeInfo* type) { v8::Persistent<v8::Function> function = m_constructorMap.get(type); if (!function.IsEmpty()) return v8::Local<v8::Function>::New(function); return constructorForTypeSlowCase(type); } private: explicit V8BindingPerContextData(v8::Handle<v8::Context> context) : m_context(context) { } void dispose(); v8::Local<v8::Object> createWrapperFromCacheSlowCase(WrapperTypeInfo*); v8::Local<v8::Function> constructorForTypeSlowCase(WrapperTypeInfo*); // For each possible type of wrapper, we keep a boilerplate object. // The boilerplate is used to create additional wrappers of the same type. typedef WTF::HashMap<WrapperTypeInfo*, v8::Persistent<v8::Object> > WrapperBoilerplateMap; WrapperBoilerplateMap m_wrapperBoilerplates; typedef WTF::HashMap<WrapperTypeInfo*, v8::Persistent<v8::Function> > ConstructorMap; ConstructorMap m_constructorMap; v8::Handle<v8::Context> m_context; OwnHandle<v8::Value> m_objectPrototype; }; } // namespace WebCore #endif // V8BindingPerContextData_h