runtime/StructureRareData.h

   1 /*
   2  * Copyright (C) 2013, 2014 Apple 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
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
  14  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  15  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
  17  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  18  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  19  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  20  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  21  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  22  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  23  * THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #ifndef StructureRareData_h
  27 #define StructureRareData_h
  28
  29 #include "ClassInfo.h"
  30 #include "JSCell.h"
  31 #include "JSTypeInfo.h"
  32 #include "PropertyOffset.h"
  33
  34 namespace JSC {
  35
  36 class JSPropertyNameEnumerator;
  37 class Structure;
  38
  39 class StructureRareData final : public JSCell {
  40 public:
  41     typedef JSCell Base;
  42     static const unsigned StructureFlags = Base::StructureFlags | StructureIsImmortal;
  43
  44     static StructureRareData* create(VM&, Structure*);
  45
  46     static const bool needsDestruction = true;
  47     static void destroy(JSCell*);
  48
  49     static void visitChildren(JSCell*, SlotVisitor&);
  50
  51     static Structure* createStructure(VM&, JSGlobalObject*, JSValue prototype);
  52
  53     Structure* previousID() const;
  54     void setPreviousID(VM&, Structure*);
  55     void clearPreviousID();
  56
  57     JSString* objectToStringValue() const;
  58     void setObjectToStringValue(VM&, JSString* value);
  59
  60     JSPropertyNameEnumerator* cachedPropertyNameEnumerator() const;
  61     void setCachedPropertyNameEnumerator(VM&, JSPropertyNameEnumerator*);
  62
  63     DECLARE_EXPORT_INFO;
  64
  65 private:
  66     friend class Structure;
  67
  68     StructureRareData(VM&, Structure*);
  69
  70     WriteBarrier<Structure> m_previous;
  71     WriteBarrier<JSString> m_objectToStringValue;
  72     WriteBarrier<JSPropertyNameEnumerator> m_cachedPropertyNameEnumerator;
  73     WriteBarrier<JSPropertyNameEnumerator> m_cachedGenericPropertyNameEnumerator;
  74
  75     typedef HashMap<PropertyOffset, RefPtr<WatchpointSet>, WTF::IntHash<PropertyOffset>, WTF::UnsignedWithZeroKeyHashTraits<PropertyOffset>> PropertyWatchpointMap;
  76     std::unique_ptr<PropertyWatchpointMap> m_replacementWatchpointSets;
  77 };
  78
  79 } // namespace JSC
  80
  81 #endif // StructureRareData_h