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
33namespace JSC {
34
35class JSPropertyNameIterator;
36class Structure;
37
38class StructureRareData : public JSCell {
39    friend class Structure;
40public:
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*);
53    void clearPreviousID();
54
55    JSString* objectToStringValue() const;
56    void setObjectToStringValue(VM&, JSString* value);
57
58    JSPropertyNameIterator* enumerationCache();
59    void setEnumerationCache(VM&, JSPropertyNameIterator* value);
60
61    DECLARE_EXPORT_INFO;
62
63private:
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
77