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 * 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. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#ifndef StructureStubInfo_h
27#define StructureStubInfo_h
28
29#if ENABLE(JIT)
30
31#include "Instruction.h"
32#include "MacroAssembler.h"
33#include "Opcode.h"
34#include "Structure.h"
35
36namespace JSC {
37
38 enum AccessType {
39 access_get_by_id_self,
40 access_get_by_id_proto,
41 access_get_by_id_chain,
42 access_get_by_id_self_list,
43 access_get_by_id_proto_list,
44 access_put_by_id_transition,
45 access_put_by_id_replace,
46 access_get_by_id,
47 access_put_by_id,
48 access_get_by_id_generic,
49 access_put_by_id_generic,
50 access_get_array_length,
51 access_get_string_length,
52 };
53
54 struct StructureStubInfo {
55 StructureStubInfo(AccessType accessType)
56 : accessType(accessType)
57 , seen(false)
58 {
59 }
60
61 void initGetByIdSelf(Structure* baseObjectStructure)
62 {
63 accessType = access_get_by_id_self;
64
65 u.getByIdSelf.baseObjectStructure = baseObjectStructure;
66 baseObjectStructure->ref();
67 }
68
69 void initGetByIdProto(Structure* baseObjectStructure, Structure* prototypeStructure)
70 {
71 accessType = access_get_by_id_proto;
72
73 u.getByIdProto.baseObjectStructure = baseObjectStructure;
74 baseObjectStructure->ref();
75
76 u.getByIdProto.prototypeStructure = prototypeStructure;
77 prototypeStructure->ref();
78 }
79
80 void initGetByIdChain(Structure* baseObjectStructure, StructureChain* chain)
81 {
82 accessType = access_get_by_id_chain;
83
84 u.getByIdChain.baseObjectStructure = baseObjectStructure;
85 baseObjectStructure->ref();
86
87 u.getByIdChain.chain = chain;
88 chain->ref();
89 }
90
91 void initGetByIdSelfList(PolymorphicAccessStructureList* structureList, int listSize)
92 {
93 accessType = access_get_by_id_self_list;
94
95 u.getByIdProtoList.structureList = structureList;
96 u.getByIdProtoList.listSize = listSize;
97 }
98
99 void initGetByIdProtoList(PolymorphicAccessStructureList* structureList, int listSize)
100 {
101 accessType = access_get_by_id_proto_list;
102
103 u.getByIdProtoList.structureList = structureList;
104 u.getByIdProtoList.listSize = listSize;
105 }
106
107 // PutById*
108
109 void initPutByIdTransition(Structure* previousStructure, Structure* structure, StructureChain* chain)
110 {
111 accessType = access_put_by_id_transition;
112
113 u.putByIdTransition.previousStructure = previousStructure;
114 previousStructure->ref();
115
116 u.putByIdTransition.structure = structure;
117 structure->ref();
118
119 u.putByIdTransition.chain = chain;
120 chain->ref();
121 }
122
123 void initPutByIdReplace(Structure* baseObjectStructure)
124 {
125 accessType = access_put_by_id_replace;
126
127 u.putByIdReplace.baseObjectStructure = baseObjectStructure;
128 baseObjectStructure->ref();
129 }
130
131 void deref();
132
133 bool seenOnce()
134 {
135 return seen;
136 }
137
138 void setSeen()
139 {
140 seen = true;
141 }
142
143 int accessType : 31;
144 int seen : 1;
145
146 union {
147 struct {
148 Structure* baseObjectStructure;
149 } getByIdSelf;
150 struct {
151 Structure* baseObjectStructure;
152 Structure* prototypeStructure;
153 } getByIdProto;
154 struct {
155 Structure* baseObjectStructure;
156 StructureChain* chain;
157 } getByIdChain;
158 struct {
159 PolymorphicAccessStructureList* structureList;
160 int listSize;
161 } getByIdSelfList;
162 struct {
163 PolymorphicAccessStructureList* structureList;
164 int listSize;
165 } getByIdProtoList;
166 struct {
167 Structure* previousStructure;
168 Structure* structure;
169 StructureChain* chain;
170 } putByIdTransition;
171 struct {
172 Structure* baseObjectStructure;
173 } putByIdReplace;
174 } u;
175
176 CodeLocationLabel stubRoutine;
177 CodeLocationCall callReturnLocation;
178 CodeLocationLabel hotPathBegin;
179 };
180
181} // namespace JSC
182
183#endif
184
185#endif // StructureStubInfo_h
186

source code of qtscript/src/3rdparty/javascriptcore/JavaScriptCore/bytecode/StructureStubInfo.h