1// -*- mode: c++; c-basic-offset: 4 -*-
2/*
3 * Copyright (C) 2008 Apple Inc. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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 *
14 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
22 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#ifndef PutPropertySlot_h
28#define PutPropertySlot_h
29
30#include <wtf/Assertions.h>
31
32namespace JSC {
33
34    class JSObject;
35    class JSFunction;
36
37    class PutPropertySlot {
38    public:
39        enum Type { Uncachable, ExistingProperty, NewProperty };
40
41        PutPropertySlot(bool isStrictMode = false)
42            : m_type(Uncachable)
43            , m_base(0)
44            , m_isStrictMode(isStrictMode)
45        {
46        }
47
48        void setExistingProperty(JSObject* base, PropertyOffset offset)
49        {
50            m_type = ExistingProperty;
51            m_base = base;
52            m_offset = offset;
53        }
54
55        void setNewProperty(JSObject* base, PropertyOffset offset)
56        {
57            m_type = NewProperty;
58            m_base = base;
59            m_offset = offset;
60        }
61
62        Type type() const { return m_type; }
63        JSObject* base() const { return m_base; }
64
65        bool isStrictMode() const { return m_isStrictMode; }
66        bool isCacheable() const { return m_type != Uncachable; }
67        PropertyOffset cachedOffset() const
68        {
69            ASSERT(isCacheable());
70            return m_offset;
71        }
72
73    private:
74        Type m_type;
75        JSObject* m_base;
76        PropertyOffset m_offset;
77        bool m_isStrictMode;
78    };
79
80} // namespace JSC
81
82#endif // PutPropertySlot_h
83