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
|
/*
* Copyright (C) 2014, 2015 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. AND ITS CONTRIBUTORS ``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 ITS 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 StructureIDBlob_h
#define StructureIDBlob_h
#include "CellState.h"
#include "IndexingType.h"
#include "JSTypeInfo.h"
#include "StructureIDTable.h"
namespace JSC {
class StructureIDBlob {
friend class LLIntOffsetsExtractor;
public:
StructureIDBlob()
{
u.doubleWord = 0xbbadbeef;
}
StructureIDBlob(StructureID structureID, IndexingType indexingType, const TypeInfo& typeInfo)
{
u.fields.structureID = structureID;
u.fields.indexingType = indexingType;
u.fields.type = typeInfo.type();
u.fields.inlineTypeFlags = typeInfo.inlineTypeFlags();
u.fields.defaultCellState = CellState::NewWhite;
}
void operator=(const StructureIDBlob& other) { u.doubleWord = other.u.doubleWord; }
StructureID structureID() const { return u.fields.structureID; }
IndexingType indexingType() const { return u.fields.indexingType; }
void setIndexingType(IndexingType indexingType) { u.fields.indexingType = indexingType; }
JSType type() const { return u.fields.type; }
TypeInfo::InlineTypeFlags inlineTypeFlags() const { return u.fields.inlineTypeFlags; }
TypeInfo typeInfo(TypeInfo::OutOfLineTypeFlags outOfLineTypeFlags) const { return TypeInfo(type(), inlineTypeFlags(), outOfLineTypeFlags); }
int32_t blobExcludingStructureID() const { return u.words.word2; }
int64_t blob() const { return u.doubleWord; }
static ptrdiff_t structureIDOffset()
{
return OBJECT_OFFSETOF(StructureIDBlob, u.fields.structureID);
}
static ptrdiff_t indexingTypeOffset()
{
return OBJECT_OFFSETOF(StructureIDBlob, u.fields.indexingType);
}
private:
union {
struct {
StructureID structureID;
IndexingType indexingType;
JSType type;
TypeInfo::InlineTypeFlags inlineTypeFlags;
CellState defaultCellState;
} fields;
struct {
int32_t word1;
int32_t word2;
} words;
int64_t doubleWord;
} u;
};
} // namespace JSC
#endif // StructureIDBlob_h
|
