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+/*
+ * 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 DOMDataStore_h
+#define DOMDataStore_h
+
+#include "DOMObjectsInclude.h"
+
+#include <v8.h>
+#include <wtf/HashMap.h>
+#include <wtf/MainThread.h>
+#include <wtf/Noncopyable.h>
+#include <wtf/OwnPtr.h>
+#include <wtf/StdLibExtras.h>
+#include <wtf/Threading.h>
+#include <wtf/ThreadSpecific.h>
+#include <wtf/Vector.h>
+
+namespace WebCore {
+
+    class DOMData;
+
+    typedef WTF::Vector<DOMDataStore*> DOMDataList;
+
+    // DOMDataStore
+    //
+    // DOMDataStore is the backing store that holds the maps between DOM objects
+    // and JavaScript objects.  In general, each thread can have multiple backing
+    // stores, one per isolated world.
+    //
+    // This class doesn't manage the lifetime of the store.  The data store
+    // lifetime is managed by subclasses.
+    //
+    class DOMDataStore : public Noncopyable {
+    public:
+        enum DOMWrapperMapType {
+            DOMNodeMap,
+            DOMObjectMap,
+            ActiveDOMObjectMap,
+#if ENABLE(SVG)
+            DOMSVGElementInstanceMap,
+            DOMSVGObjectWithContextMap
+#endif
+        };
+
+        template <class KeyType>
+        class InternalDOMWrapperMap : public DOMWrapperMap<KeyType> {
+        public:
+            InternalDOMWrapperMap(DOMData* domData, v8::WeakReferenceCallback callback)
+                : DOMWrapperMap<KeyType>(callback), m_domData(domData) { }
+
+            virtual void forget(KeyType* object)
+            {
+                DOMWrapperMap<KeyType>::forget(object);
+                forgetDelayedObject(m_domData, object);
+            }
+
+            void forgetOnly(KeyType* object) { DOMWrapperMap<KeyType>::forget(object); }
+
+        private:
+            DOMData* m_domData;
+        };
+
+        DOMDataStore(DOMData*);
+        virtual ~DOMDataStore();
+
+        // A list of all DOMDataStore objects.  Traversed during GC to find a thread-specific map that
+        // contains the object - so we can schedule the object to be deleted on the thread which created it.
+        static DOMDataList& allStores();
+        // Mutex to protect against concurrent access of DOMDataList.
+        static WTF::Mutex& allStoresMutex();
+
+        // Helper function to avoid circular includes.
+        static void forgetDelayedObject(DOMData*, void* object);
+
+        DOMData* domData() const { return m_domData; }
+
+        void* getDOMWrapperMap(DOMWrapperMapType);
+
+        InternalDOMWrapperMap<Node>& domNodeMap() { return *m_domNodeMap; }
+        InternalDOMWrapperMap<void>& domObjectMap() { return *m_domObjectMap; }
+        InternalDOMWrapperMap<void>& activeDomObjectMap() { return *m_activeDomObjectMap; }
+#if ENABLE(SVG)
+        InternalDOMWrapperMap<SVGElementInstance>& domSvgElementInstanceMap() { return *m_domSvgElementInstanceMap; }
+        InternalDOMWrapperMap<void>& domSvgObjectWithContextMap() { return *m_domSvgObjectWithContextMap; }
+#endif
+
+        // Need by V8GCController.
+        static void weakActiveDOMObjectCallback(v8::Persistent<v8::Value> v8Object, void* domObject);
+
+    protected:
+        static void weakNodeCallback(v8::Persistent<v8::Value> v8Object, void* domObject);
+        static void weakDOMObjectCallback(v8::Persistent<v8::Value> v8Object, void* domObject);
+#if ENABLE(SVG)
+        static void weakSVGElementInstanceCallback(v8::Persistent<v8::Value> v8Object, void* domObject);
+        // SVG non-node elements may have a reference to a context node which should be notified when the element is change.
+        static void weakSVGObjectWithContextCallback(v8::Persistent<v8::Value> v8Object, void* domObject);
+#endif
+        
+        InternalDOMWrapperMap<Node>* m_domNodeMap;
+        InternalDOMWrapperMap<void>* m_domObjectMap;
+        InternalDOMWrapperMap<void>* m_activeDomObjectMap;
+#if ENABLE(SVG)
+        InternalDOMWrapperMap<SVGElementInstance>* m_domSvgElementInstanceMap;
+        InternalDOMWrapperMap<void>* m_domSvgObjectWithContextMap;
+#endif
+
+    private:
+        // A back-pointer to the DOMData to which we belong.
+        DOMData* m_domData;
+    };
+
+} // namespace WebCore
+
+#endif // DOMDataStore_h