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. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#ifndef IntendedStructureChain_h
27#define IntendedStructureChain_h
28
29#include "Structure.h"
30#include <wtf/RefCounted.h>
31
32namespace JSC {
33
34class CodeBlock;
35class JSGlobalObject;
36class StructureChain;
37class VM;
38struct DumpContext;
39
40class IntendedStructureChain : public RefCounted<IntendedStructureChain> {
41public:
42    IntendedStructureChain(JSGlobalObject* globalObject, Structure* head);
43    IntendedStructureChain(CodeBlock* codeBlock, Structure* head, Structure* prototypeStructure);
44    IntendedStructureChain(CodeBlock* codeBlock, Structure* head, StructureChain* chain);
45    IntendedStructureChain(CodeBlock* codeBlock, Structure* head, StructureChain* chain, unsigned count);
46    ~IntendedStructureChain();
47
48    bool isStillValid() const;
49    bool matches(StructureChain*) const;
50    StructureChain* chain(VM&) const;
51    bool mayInterceptStoreTo(VM&, StringImpl* uid);
52    bool isNormalized();
53
54    Structure* head() const { return m_head; }
55
56    size_t size() const { return m_vector.size(); }
57    Structure* at(size_t index) { return m_vector[index]; }
58    Structure* operator[](size_t index) { return at(index); }
59
60    JSObject* terminalPrototype() const;
61
62    Structure* last() const { return m_vector.last(); }
63
64    void visitChildren(SlotVisitor&);
65    void dump(PrintStream&) const;
66    void dumpInContext(PrintStream&, DumpContext*) const;
67
68private:
69    JSGlobalObject* m_globalObject;
70    Structure* m_head;
71    Vector<Structure*> m_vector;
72};
73
74} // namespace JSC
75
76#endif // IntendedStructureChain_h
77