1/*
2 * Copyright (C) 2008 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 Computer, 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 RegisterID_h
30#define RegisterID_h
31
32#include <wtf/Assertions.h>
33#include <wtf/Noncopyable.h>
34#include <wtf/VectorTraits.h>
35
36namespace JSC {
37
38 class RegisterID : public Noncopyable {
39 public:
40 RegisterID()
41 : m_refCount(0)
42 , m_isTemporary(false)
43#ifndef NDEBUG
44 , m_didSetIndex(false)
45#endif
46 {
47 }
48
49 explicit RegisterID(int index)
50 : m_refCount(0)
51 , m_index(index)
52 , m_isTemporary(false)
53#ifndef NDEBUG
54 , m_didSetIndex(true)
55#endif
56 {
57 }
58
59 void setIndex(int index)
60 {
61 ASSERT(!m_refCount);
62#ifndef NDEBUG
63 m_didSetIndex = true;
64#endif
65 m_index = index;
66 }
67
68 void setTemporary()
69 {
70 m_isTemporary = true;
71 }
72
73 int index() const
74 {
75 ASSERT(m_didSetIndex);
76 return m_index;
77 }
78
79 bool isTemporary()
80 {
81 return m_isTemporary;
82 }
83
84 void ref()
85 {
86 ++m_refCount;
87 }
88
89 void deref()
90 {
91 --m_refCount;
92 ASSERT(m_refCount >= 0);
93 }
94
95 int refCount() const
96 {
97 return m_refCount;
98 }
99
100 private:
101
102 int m_refCount;
103 int m_index;
104 bool m_isTemporary;
105#ifndef NDEBUG
106 bool m_didSetIndex;
107#endif
108 };
109
110} // namespace JSC
111
112namespace WTF {
113
114 template<> struct VectorTraits<JSC::RegisterID> : VectorTraitsBase<true, JSC::RegisterID> {
115 static const bool needsInitialization = true;
116 static const bool canInitializeWithMemset = true; // Default initialization just sets everything to 0 or false, so this is safe.
117 };
118
119} // namespace WTF
120
121#endif // RegisterID_h
122

source code of qtscript/src/3rdparty/javascriptcore/JavaScriptCore/bytecompiler/RegisterID.h