runtime/StructureRareData.h

   1 /*
   2  * Copyright (C) 2013 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
  33 namespace JSC {
  34
  35 class JSPropertyNameIterator;
  36 class Structure;
  37
  38 class StructureRareData : public JSCell {
  39     friend class Structure;
  40 public:
  41     static StructureRareData* create(VM&, Structure*);
  42     static StructureRareData* clone(VM&, const StructureRareData* other);
  43
  44     static void visitChildren(JSCell*, SlotVisitor&);
  45
  46     static Structure* createStructure(VM&, JSGlobalObject*, JSValue prototype);
  47
  48     // Returns true if this StructureRareData should also be cloned when cloning the owner Structure.
  49     bool needsCloning() const { return false; }
  50
  51     Structure* previousID() const;
  52     void setPreviousID(VM&, Structure* transition, Structure*);
  53     void clearPreviousID();
  54
  55     JSString* objectToStringValue() const;
  56     void setObjectToStringValue(VM&, const JSCell* owner, JSString* value);
  57
  58     JSPropertyNameIterator* enumerationCache();
  59     void setEnumerationCache(VM&, const Structure* owner, JSPropertyNameIterator* value);
  60
  61     static JS_EXPORTDATA const ClassInfo s_info;
  62
  63 private:
  64     StructureRareData(VM&, Structure*);
  65     StructureRareData(VM&, const StructureRareData*);
  66
  67     static const unsigned StructureFlags = OverridesVisitChildren | JSCell::StructureFlags;
  68
  69     WriteBarrier<Structure> m_previous;
  70     WriteBarrier<JSString> m_objectToStringValue;
  71     WriteBarrier<JSPropertyNameIterator> m_enumerationCache;
  72 };
  73
  74 } // namespace JSC
  75
  76 #endif // StructureRareData_h