1/*
2 * Copyright (C) 2007, 2008, 2012 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 *
8 * 1.  Redistributions of source code must retain the above copyright
9 *     notice, this list of conditions and the following disclaimer.
10 * 2.  Redistributions in binary form must reproduce the above copyright
11 *     notice, this list of conditions and the following disclaimer in the
12 *     documentation and/or other materials provided with the distribution.
13 * 3.  Neither the name of Apple Inc. ("Apple") nor the names of
14 *     its contributors may be used to endorse or promote products derived
15 *     from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#ifndef JSVariableObject_h
30#define JSVariableObject_h
31
32#include "JSObject.h"
33#include "JSSymbolTableObject.h"
34#include "Register.h"
35#include "SymbolTable.h"
36
37namespace JSC {
38
39class LLIntOffsetsExtractor;
40class Register;
41
42class JSVariableObject : public JSSymbolTableObject {
43    friend class JIT;
44    friend class LLIntOffsetsExtractor;
45
46public:
47    typedef JSSymbolTableObject Base;
48
49    WriteBarrierBase<Unknown>* registers() { return m_registers; }
50    WriteBarrierBase<Unknown>& registerAt(int index) const { return m_registers[index]; }
51
52    WriteBarrierBase<Unknown>* const * addressOfRegisters() const { return &m_registers; }
53    static size_t offsetOfRegisters() { return OBJECT_OFFSETOF(JSVariableObject, m_registers); }
54
55    DECLARE_INFO;
56
57protected:
58    static const unsigned StructureFlags = Base::StructureFlags;
59
60    JSVariableObject(
61        VM& vm,
62        Structure* structure,
63        Register* registers,
64        JSScope* scope,
65        SymbolTable* symbolTable = 0)
66        : Base(vm, structure, scope, symbolTable)
67        , m_registers(reinterpret_cast<WriteBarrierBase<Unknown>*>(registers))
68    {
69    }
70
71    WriteBarrierBase<Unknown>* m_registers; // "r" in the stack.
72};
73
74} // namespace JSC
75
76#endif // JSVariableObject_h
77