1/*
2 * Copyright (C) 2014, 2015 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 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#ifndef StructureIDBlob_h
27#define StructureIDBlob_h
28
29#include "CellState.h"
30#include "IndexingType.h"
31#include "JSTypeInfo.h"
32#include "StructureIDTable.h"
33
34namespace JSC {
35
36class StructureIDBlob {
37 friend class LLIntOffsetsExtractor;
38public:
39 StructureIDBlob()
40 {
41 u.doubleWord = 0xbbadbeef;
42 }
43
44 StructureIDBlob(StructureID structureID, IndexingType indexingType, const TypeInfo& typeInfo)
45 {
46 u.fields.structureID = structureID;
47 u.fields.indexingType = indexingType;
48 u.fields.type = typeInfo.type();
49 u.fields.inlineTypeFlags = typeInfo.inlineTypeFlags();
50 u.fields.defaultCellState = CellState::NewWhite;
51 }
52
53 void operator=(const StructureIDBlob& other) { u.doubleWord = other.u.doubleWord; }
54
55 StructureID structureID() const { return u.fields.structureID; }
56 IndexingType indexingType() const { return u.fields.indexingType; }
57 void setIndexingType(IndexingType indexingType) { u.fields.indexingType = indexingType; }
58 JSType type() const { return u.fields.type; }
59 TypeInfo::InlineTypeFlags inlineTypeFlags() const { return u.fields.inlineTypeFlags; }
60
61 TypeInfo typeInfo(TypeInfo::OutOfLineTypeFlags outOfLineTypeFlags) const { return TypeInfo(type(), inlineTypeFlags(), outOfLineTypeFlags); }
62
63 int32_t blobExcludingStructureID() const { return u.words.word2; }
64 int64_t blob() const { return u.doubleWord; }
65
66 static ptrdiff_t structureIDOffset()
67 {
68 return OBJECT_OFFSETOF(StructureIDBlob, u.fields.structureID);
69 }
70
71 static ptrdiff_t indexingTypeOffset()
72 {
73 return OBJECT_OFFSETOF(StructureIDBlob, u.fields.indexingType);
74 }
75
76private:
77 union {
78 struct {
79 StructureID structureID;
80 IndexingType indexingType;
81 JSType type;
82 TypeInfo::InlineTypeFlags inlineTypeFlags;
83 CellState defaultCellState;
84 } fields;
85 struct {
86 int32_t word1;
87 int32_t word2;
88 } words;
89 int64_t doubleWord;
90 } u;
91};
92
93} // namespace JSC
94
95#endif // StructureIDBlob_h
96