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      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 DOMDataStore_h
     32 #define DOMDataStore_h
     33 
     34 #include "V8DOMMap.h"
     35 #include "V8Node.h"
     36 
     37 #include <v8.h>
     38 #include <wtf/HashMap.h>
     39 #include <wtf/MainThread.h>
     40 #include <wtf/Noncopyable.h>
     41 #include <wtf/OwnPtr.h>
     42 #include <wtf/StdLibExtras.h>
     43 #include <wtf/Threading.h>
     44 #include <wtf/ThreadSpecific.h>
     45 #include <wtf/Vector.h>
     46 
     47 namespace WebCore {
     48 
     49     class DOMData;
     50     class DOMDataStore;
     51 
     52     typedef WTF::Vector<DOMDataStore*> DOMDataList;
     53 
     54     // DOMDataStore
     55     //
     56     // DOMDataStore is the backing store that holds the maps between DOM objects
     57     // and JavaScript objects.  In general, each thread can have multiple backing
     58     // stores, one per isolated world.
     59     //
     60     // This class doesn't manage the lifetime of the store.  The data store
     61     // lifetime is managed by subclasses.
     62     //
     63     class DOMDataStore {
     64         WTF_MAKE_NONCOPYABLE(DOMDataStore);
     65     public:
     66         enum DOMWrapperMapType {
     67             DOMNodeMap,
     68             DOMObjectMap,
     69             ActiveDOMObjectMap,
     70 #if ENABLE(SVG)
     71             DOMSVGElementInstanceMap
     72 #endif
     73         };
     74 
     75         DOMDataStore(DOMData*);
     76         virtual ~DOMDataStore();
     77 
     78         // A list of all DOMDataStore objects in the current V8 instance (thread). Normally, each World has a DOMDataStore.
     79         static DOMDataList& allStores();
     80         // Mutex to protect against concurrent access of DOMDataList.
     81         static WTF::Mutex& allStoresMutex();
     82 
     83         DOMData* domData() const { return m_domData; }
     84 
     85         void* getDOMWrapperMap(DOMWrapperMapType);
     86 
     87         DOMNodeMapping& domNodeMap() { return *m_domNodeMap; }
     88         DOMWrapperMap<void>& domObjectMap() { return *m_domObjectMap; }
     89         DOMWrapperMap<void>& activeDomObjectMap() { return *m_activeDomObjectMap; }
     90 #if ENABLE(SVG)
     91         DOMWrapperMap<SVGElementInstance>& domSvgElementInstanceMap() { return *m_domSvgElementInstanceMap; }
     92 #endif
     93 
     94         // Need by V8GCController.
     95         static void weakActiveDOMObjectCallback(v8::Persistent<v8::Value> v8Object, void* domObject);
     96 
     97     protected:
     98         static void weakNodeCallback(v8::Persistent<v8::Value> v8Object, void* domObject);
     99         static void weakDOMObjectCallback(v8::Persistent<v8::Value> v8Object, void* domObject);
    100 #if ENABLE(SVG)
    101         static void weakSVGElementInstanceCallback(v8::Persistent<v8::Value> v8Object, void* domObject);
    102 #endif
    103 
    104         DOMNodeMapping* m_domNodeMap;
    105         DOMWrapperMap<void>* m_domObjectMap;
    106         DOMWrapperMap<void>* m_activeDomObjectMap;
    107 #if ENABLE(SVG)
    108         DOMWrapperMap<SVGElementInstance>* m_domSvgElementInstanceMap;
    109 #endif
    110 
    111     private:
    112         // A back-pointer to the DOMData to which we belong.
    113         DOMData* m_domData;
    114     };
    115 
    116 } // namespace WebCore
    117 
    118 #endif // DOMDataStore_h
    119