1 /* 2 * Copyright (C) 2009 Google Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are 6 * met: 7 * 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * * Neither the name of Google Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived from 16 * this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #ifndef DOMData_h 32 #define DOMData_h 33 34 #include "DOMDataStore.h" 35 36 namespace WebCore { 37 38 // DOMData 39 // 40 // DOMData represents the all the DOM wrappers for a given thread. In 41 // particular, DOMData holds wrappers for all the isolated worlds in the 42 // thread. The DOMData for the main thread and the DOMData for child threads 43 // use different subclasses. 44 // 45 class DOMData : public Noncopyable { 46 public: 47 DOMData(); 48 virtual ~DOMData(); 49 50 static DOMData* getCurrent(); 51 virtual DOMDataStore& getStore() = 0; 52 53 template<typename T> 54 static void handleWeakObject(DOMDataStore::DOMWrapperMapType, v8::Persistent<v8::Object>, T* domObject); 55 56 void forgetDelayedObject(void* object) { m_delayedObjectMap.take(object); } 57 58 // This is to ensure that we will deref DOM objects from the owning thread, 59 // not the GC thread. The helper function will be scheduled by the GC 60 // thread to get called from the owning thread. 61 static void derefDelayedObjectsInCurrentThread(void*); 62 void derefDelayedObjects(); 63 64 template<typename T> 65 static void removeObjectsFromWrapperMap(AbstractWeakReferenceMap<T, v8::Object>& domMap); 66 67 ThreadIdentifier owningThread() const { return m_owningThread; } 68 69 private: 70 typedef WTF::HashMap<void*, V8ClassIndex::V8WrapperType> DelayedObjectMap; 71 72 void ensureDeref(V8ClassIndex::V8WrapperType type, void* domObject); 73 static void derefObject(V8ClassIndex::V8WrapperType type, void* domObject); 74 75 template<typename T> 76 class WrapperMapObjectRemover : public WeakReferenceMap<T, v8::Object>::Visitor { 77 public: 78 virtual void visitDOMWrapper(T* domObject, v8::Persistent<v8::Object> v8Object) 79 { 80 V8ClassIndex::V8WrapperType type = V8DOMWrapper::domWrapperType(v8Object); 81 derefObject(type, domObject); 82 v8Object.Dispose(); 83 } 84 }; 85 86 // Stores all the DOM objects that are delayed to be processed when the 87 // owning thread gains control. 88 DelayedObjectMap m_delayedObjectMap; 89 90 // The flag to indicate if the task to do the delayed process has 91 // already been posted. 92 bool m_delayedProcessingScheduled; 93 94 bool m_isMainThread; 95 ThreadIdentifier m_owningThread; 96 }; 97 98 template<typename T> 99 void DOMData::handleWeakObject(DOMDataStore::DOMWrapperMapType mapType, v8::Persistent<v8::Object> v8Object, T* domObject) 100 { 101 ASSERT(WTF::isMainThread()); 102 DOMDataList& list = DOMDataStore::allStores(); 103 for (size_t i = 0; i < list.size(); ++i) { 104 DOMDataStore* store = list[i]; 105 106 DOMDataStore::InternalDOMWrapperMap<T>* domMap = static_cast<DOMDataStore::InternalDOMWrapperMap<T>*>(store->getDOMWrapperMap(mapType)); 107 108 if (domMap->removeIfPresent(domObject, v8Object)) { 109 ASSERT(store->domData()->owningThread() == WTF::currentThread()); 110 store->domData()->derefObject(V8DOMWrapper::domWrapperType(v8Object), domObject); 111 } 112 } 113 } 114 115 template<typename T> 116 void DOMData::removeObjectsFromWrapperMap(AbstractWeakReferenceMap<T, v8::Object>& domMap) 117 { 118 WrapperMapObjectRemover<T> remover; 119 domMap.visit(&remover); 120 domMap.clear(); 121 } 122 123 } // namespace WebCore 124 125 #endif // DOMData_h 126