/* * Copyright (C) 2009 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 V8DOMMap_h #define V8DOMMap_h #include <wtf/HashMap.h> #include <v8.h> namespace WebCore { class Node; #if ENABLE(SVG) class SVGElementInstance; #endif // A table of wrappers with weak pointers. // This table allows us to avoid track wrapped objects for debugging // and for ensuring that we don't double wrap the same object. template<class KeyType, class ValueType> class WeakReferenceMap { public: WeakReferenceMap(v8::WeakReferenceCallback callback) : m_weakReferenceCallback(callback) { } #ifndef NDEBUG virtual ~WeakReferenceMap() { if (m_map.size() > 0) fprintf(stderr, "Leak %d JS wrappers.\n", m_map.size()); } #endif // Get the JS wrapper object of an object. virtual v8::Persistent<ValueType> get(KeyType* obj) { ValueType* wrapper = m_map.get(obj); return wrapper ? v8::Persistent<ValueType>(wrapper) : v8::Persistent<ValueType>(); } virtual void set(KeyType* obj, v8::Persistent<ValueType> wrapper) { ASSERT(!m_map.contains(obj)); wrapper.MakeWeak(obj, m_weakReferenceCallback); m_map.set(obj, *wrapper); } virtual void forget(KeyType* obj) { ASSERT(obj); ValueType* wrapper = m_map.take(obj); if (!wrapper) return; v8::Persistent<ValueType> handle(wrapper); handle.Dispose(); handle.Clear(); } bool contains(KeyType* obj) { return m_map.contains(obj); } HashMap<KeyType*, ValueType*>& impl() { return m_map; } protected: HashMap<KeyType*, ValueType*> m_map; v8::WeakReferenceCallback m_weakReferenceCallback; }; template <class KeyType> class DOMWrapperMap : public WeakReferenceMap<KeyType, v8::Object> { public: DOMWrapperMap(v8::WeakReferenceCallback callback) : WeakReferenceMap<KeyType, v8::Object>(callback) { } }; // Callback when JS wrapper of active DOM object is dead. void weakActiveDOMObjectCallback(v8::Persistent<v8::Value> v8Object, void* domObject); // A map from DOM node to its JS wrapper. DOMWrapperMap<Node>& getDOMNodeMap(); // A map from a DOM object (non-node) to its JS wrapper. This map does not contain the DOM objects which can have pending activity (active dom objects). DOMWrapperMap<void>& getDOMObjectMap(); // A map from a DOM object to its JS wrapper for DOM objects which can have pending activity. DOMWrapperMap<void>& getActiveDOMObjectMap(); // This should be called to remove all DOM objects associated with the current thread when it is tearing down. void removeAllDOMObjectsInCurrentThread(); #if ENABLE(SVG) // A map for SVGElementInstances to its JS wrapper. DOMWrapperMap<SVGElementInstance>& getDOMSVGElementInstanceMap(); // Map of SVG objects with contexts to V8 objects. DOMWrapperMap<void>& getDOMSVGObjectWithContextMap(); #endif } // namespace WebCore #endif // V8DOMMap_h