1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
|
/*
* Copyright (C) 2012 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef PropertyOffset_h
#define PropertyOffset_h
#include <wtf/Platform.h>
#include <wtf/StdLibExtras.h>
namespace JSC {
typedef int PropertyOffset;
static const PropertyOffset invalidOffset = -1;
static const PropertyOffset firstOutOfLineOffset = 100;
// Declare all of the functions because they tend to do forward calls.
inline void checkOffset(PropertyOffset);
inline void checkOffset(PropertyOffset, int inlineCapacity);
inline void validateOffset(PropertyOffset);
inline void validateOffset(PropertyOffset, int inlineCapacity);
inline bool isValidOffset(PropertyOffset);
inline bool isInlineOffset(PropertyOffset);
inline bool isOutOfLineOffset(PropertyOffset);
inline size_t offsetInInlineStorage(PropertyOffset);
inline size_t offsetInOutOfLineStorage(PropertyOffset);
inline size_t offsetInRespectiveStorage(PropertyOffset);
inline size_t numberOfOutOfLineSlotsForLastOffset(PropertyOffset);
inline size_t numberOfSlotsForLastOffset(PropertyOffset, int inlineCapacity);
inline void checkOffset(PropertyOffset offset)
{
UNUSED_PARAM(offset);
ASSERT(offset >= invalidOffset);
}
inline void checkOffset(PropertyOffset offset, int inlineCapacity)
{
UNUSED_PARAM(offset);
UNUSED_PARAM(inlineCapacity);
ASSERT(offset >= invalidOffset);
ASSERT(offset == invalidOffset
|| offset < inlineCapacity
|| isOutOfLineOffset(offset));
}
inline void validateOffset(PropertyOffset offset)
{
checkOffset(offset);
ASSERT(isValidOffset(offset));
}
inline void validateOffset(PropertyOffset offset, int inlineCapacity)
{
checkOffset(offset, inlineCapacity);
ASSERT(isValidOffset(offset));
}
inline bool isValidOffset(PropertyOffset offset)
{
checkOffset(offset);
return offset != invalidOffset;
}
inline bool isInlineOffset(PropertyOffset offset)
{
checkOffset(offset);
return offset < firstOutOfLineOffset;
}
inline bool isOutOfLineOffset(PropertyOffset offset)
{
checkOffset(offset);
return !isInlineOffset(offset);
}
inline size_t offsetInInlineStorage(PropertyOffset offset)
{
validateOffset(offset);
ASSERT(isInlineOffset(offset));
return offset;
}
inline size_t offsetInOutOfLineStorage(PropertyOffset offset)
{
validateOffset(offset);
ASSERT(isOutOfLineOffset(offset));
return -static_cast<ptrdiff_t>(offset - firstOutOfLineOffset) - 1;
}
inline size_t offsetInRespectiveStorage(PropertyOffset offset)
{
if (isInlineOffset(offset))
return offsetInInlineStorage(offset);
return offsetInOutOfLineStorage(offset);
}
inline size_t numberOfOutOfLineSlotsForLastOffset(PropertyOffset offset)
{
checkOffset(offset);
if (offset < firstOutOfLineOffset)
return 0;
return offset - firstOutOfLineOffset + 1;
}
inline size_t numberOfSlotsForLastOffset(PropertyOffset offset, int inlineCapacity)
{
checkOffset(offset, inlineCapacity);
if (offset < inlineCapacity)
return offset + 1;
return inlineCapacity + numberOfOutOfLineSlotsForLastOffset(offset);
}
inline PropertyOffset offsetForPropertyNumber(int propertyNumber, int inlineCapacity)
{
PropertyOffset offset = propertyNumber;
if (offset >= inlineCapacity) {
offset += firstOutOfLineOffset;
offset -= inlineCapacity;
}
return offset;
}
} // namespace JSC
#endif // PropertyOffset_h
|
