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 Instruction_h |
30 | #define Instruction_h |
31 | |
32 | #include "MacroAssembler.h" |
33 | #include "Opcode.h" |
34 | #include "Structure.h" |
35 | #include "StructureChain.h" |
36 | #include <wtf/VectorTraits.h> |
37 | |
38 | #define POLYMORPHIC_LIST_CACHE_SIZE 8 |
39 | |
40 | namespace JSC { |
41 | |
42 | // *Sigh*, If the JIT is enabled we need to track the stubRountine (of type CodeLocationLabel), |
43 | // If the JIT is not in use we don't actually need the variable (that said, if the JIT is not in use we don't |
44 | // curently actually use PolymorphicAccessStructureLists, which we should). Anyway, this seems like the best |
45 | // solution for now - will need to something smarter if/when we actually want mixed-mode operation. |
46 | #if ENABLE(JIT) |
47 | typedef CodeLocationLabel PolymorphicAccessStructureListStubRoutineType; |
48 | #else |
49 | typedef void* PolymorphicAccessStructureListStubRoutineType; |
50 | #endif |
51 | |
52 | class JSCell; |
53 | class Structure; |
54 | class StructureChain; |
55 | |
56 | // Structure used by op_get_by_id_self_list and op_get_by_id_proto_list instruction to hold data off the main opcode stream. |
57 | struct PolymorphicAccessStructureList : FastAllocBase { |
58 | struct PolymorphicStubInfo { |
59 | bool isChain; |
60 | PolymorphicAccessStructureListStubRoutineType stubRoutine; |
61 | Structure* base; |
62 | union { |
63 | Structure* proto; |
64 | StructureChain* chain; |
65 | } u; |
66 | |
67 | void set(PolymorphicAccessStructureListStubRoutineType _stubRoutine, Structure* _base) |
68 | { |
69 | stubRoutine = _stubRoutine; |
70 | base = _base; |
71 | u.proto = 0; |
72 | isChain = false; |
73 | } |
74 | |
75 | void set(PolymorphicAccessStructureListStubRoutineType _stubRoutine, Structure* _base, Structure* _proto) |
76 | { |
77 | stubRoutine = _stubRoutine; |
78 | base = _base; |
79 | u.proto = _proto; |
80 | isChain = false; |
81 | } |
82 | |
83 | void set(PolymorphicAccessStructureListStubRoutineType _stubRoutine, Structure* _base, StructureChain* _chain) |
84 | { |
85 | stubRoutine = _stubRoutine; |
86 | base = _base; |
87 | u.chain = _chain; |
88 | isChain = true; |
89 | } |
90 | } list[POLYMORPHIC_LIST_CACHE_SIZE]; |
91 | |
92 | PolymorphicAccessStructureList(PolymorphicAccessStructureListStubRoutineType stubRoutine, Structure* firstBase) |
93 | { |
94 | list[0].set(stubRoutine: stubRoutine, base: firstBase); |
95 | } |
96 | |
97 | PolymorphicAccessStructureList(PolymorphicAccessStructureListStubRoutineType stubRoutine, Structure* firstBase, Structure* firstProto) |
98 | { |
99 | list[0].set(stubRoutine: stubRoutine, base: firstBase, proto: firstProto); |
100 | } |
101 | |
102 | PolymorphicAccessStructureList(PolymorphicAccessStructureListStubRoutineType stubRoutine, Structure* firstBase, StructureChain* firstChain) |
103 | { |
104 | list[0].set(stubRoutine: stubRoutine, base: firstBase, chain: firstChain); |
105 | } |
106 | |
107 | void derefStructures(int count) |
108 | { |
109 | for (int i = 0; i < count; ++i) { |
110 | PolymorphicStubInfo& info = list[i]; |
111 | |
112 | ASSERT(info.base); |
113 | info.base->deref(); |
114 | |
115 | if (info.u.proto) { |
116 | if (info.isChain) |
117 | info.u.chain->deref(); |
118 | else |
119 | info.u.proto->deref(); |
120 | } |
121 | } |
122 | } |
123 | }; |
124 | |
125 | struct Instruction { |
126 | Instruction(Opcode opcode) |
127 | { |
128 | #if !HAVE(COMPUTED_GOTO) |
129 | // We have to initialize one of the pointer members to ensure that |
130 | // the entire struct is initialized, when opcode is not a pointer. |
131 | u.jsCell = 0; |
132 | #endif |
133 | u.opcode = opcode; |
134 | } |
135 | |
136 | Instruction(int operand) |
137 | { |
138 | // We have to initialize one of the pointer members to ensure that |
139 | // the entire struct is initialized in 64-bit. |
140 | u.jsCell = 0; |
141 | u.operand = operand; |
142 | } |
143 | |
144 | Instruction(Structure* structure) { u.structure = structure; } |
145 | Instruction(StructureChain* structureChain) { u.structureChain = structureChain; } |
146 | Instruction(JSCell* jsCell) { u.jsCell = jsCell; } |
147 | Instruction(PolymorphicAccessStructureList* polymorphicStructures) { u.polymorphicStructures = polymorphicStructures; } |
148 | |
149 | union { |
150 | Opcode opcode; |
151 | int operand; |
152 | Structure* structure; |
153 | StructureChain* structureChain; |
154 | JSCell* jsCell; |
155 | PolymorphicAccessStructureList* polymorphicStructures; |
156 | } u; |
157 | }; |
158 | |
159 | } // namespace JSC |
160 | |
161 | namespace WTF { |
162 | |
163 | template<> struct VectorTraits<JSC::Instruction> : VectorTraitsBase<true, JSC::Instruction> { }; |
164 | |
165 | } // namespace WTF |
166 | |
167 | #endif // Instruction_h |
168 | |