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1 // Copyright 2008 the V8 project authors. All rights reserved. | 1 // Copyright 2008 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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113 typedef int32_t instr_t; | 113 typedef int32_t instr_t; |
114 | 114 |
115 | 115 |
116 // The class Instr enables access to individual fields defined in the ARM | 116 // The class Instr enables access to individual fields defined in the ARM |
117 // architecture instruction set encoding as described in figure A3-1. | 117 // architecture instruction set encoding as described in figure A3-1. |
118 // | 118 // |
119 // Example: Test whether the instruction at ptr does set the condition code | 119 // Example: Test whether the instruction at ptr does set the condition code |
120 // bits. | 120 // bits. |
121 // | 121 // |
122 // bool InstructionSetsConditionCodes(byte* ptr) { | 122 // bool InstructionSetsConditionCodes(byte* ptr) { |
123 // Instr *instr = Instr::At(ptr); | 123 // Instr* instr = Instr::At(ptr); |
124 // int type = instr->TypeField(); | 124 // int type = instr->TypeField(); |
125 // return ((type == 0) || (type == 1)) && instr->HasS(); | 125 // return ((type == 0) || (type == 1)) && instr->HasS(); |
126 // } | 126 // } |
127 // | 127 // |
128 class Instr { | 128 class Instr { |
129 public: | 129 public: |
130 enum { | 130 enum { |
131 kInstrSize = 4, | 131 kInstrSize = 4, |
132 kPCReadOffset = 8 | 132 kPCReadOffset = 8 |
133 }; | 133 }; |
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225 | 225 |
226 private: | 226 private: |
227 // We need to prevent the creation of instances of class Instr. | 227 // We need to prevent the creation of instances of class Instr. |
228 DISALLOW_IMPLICIT_CONSTRUCTORS(Instr); | 228 DISALLOW_IMPLICIT_CONSTRUCTORS(Instr); |
229 }; | 229 }; |
230 | 230 |
231 | 231 |
232 } } // namespace assembler::arm | 232 } } // namespace assembler::arm |
233 | 233 |
234 #endif // V8_CONSTANTS_ARM_H_ | 234 #endif // V8_CONSTANTS_ARM_H_ |
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