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1 // Copyright (c) 1994-2006 Sun Microsystems Inc. | 1 // Copyright (c) 1994-2006 Sun Microsystems Inc. |
2 // All Rights Reserved. | 2 // All Rights Reserved. |
3 // | 3 // |
4 // Redistribution and use in source and binary forms, with or without | 4 // Redistribution and use in source and binary forms, with or without |
5 // modification, are permitted provided that the following conditions are | 5 // modification, are permitted provided that the following conditions are |
6 // met: | 6 // met: |
7 // | 7 // |
8 // - Redistributions of source code must retain the above copyright notice, | 8 // - Redistributions of source code must retain the above copyright notice, |
9 // this list of conditions and the following disclaimer. | 9 // this list of conditions and the following disclaimer. |
10 // | 10 // |
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388 | 388 |
389 // Offset from existing memory operand. | 389 // Offset from existing memory operand. |
390 // Offset is added to existing displacement as 32-bit signed values and | 390 // Offset is added to existing displacement as 32-bit signed values and |
391 // this must not overflow. | 391 // this must not overflow. |
392 Operand(const Operand& base, int32_t offset); | 392 Operand(const Operand& base, int32_t offset); |
393 | 393 |
394 // Checks whether either base or index register is the given register. | 394 // Checks whether either base or index register is the given register. |
395 // Does not check the "reg" part of the Operand. | 395 // Does not check the "reg" part of the Operand. |
396 bool AddressUsesRegister(Register reg) const; | 396 bool AddressUsesRegister(Register reg) const; |
397 | 397 |
| 398 // Queries related to the size of the generated instruction. |
| 399 // Whether the generated instruction will have a REX prefix. |
| 400 bool requires_rex() const { return rex_ != 0; } |
| 401 // Size of the ModR/M, SIB and displacement parts of the generated |
| 402 // instruction. |
| 403 int operand_size() const { return len_; } |
| 404 |
398 private: | 405 private: |
399 byte rex_; | 406 byte rex_; |
400 byte buf_[6]; | 407 byte buf_[6]; |
401 // The number of bytes of buf_ in use. | 408 // The number of bytes of buf_ in use. |
402 byte len_; | 409 byte len_; |
403 | 410 |
404 // Set the ModR/M byte without an encoded 'reg' register. The | 411 // Set the ModR/M byte without an encoded 'reg' register. The |
405 // register is encoded later as part of the emit_operand operation. | 412 // register is encoded later as part of the emit_operand operation. |
406 // set_modrm can be called before or after set_sib and set_disp*. | 413 // set_modrm can be called before or after set_sib and set_disp*. |
407 inline void set_modrm(int mod, Register rm); | 414 inline void set_modrm(int mod, Register rm); |
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1575 private: | 1582 private: |
1576 Assembler* assembler_; | 1583 Assembler* assembler_; |
1577 #ifdef DEBUG | 1584 #ifdef DEBUG |
1578 int space_before_; | 1585 int space_before_; |
1579 #endif | 1586 #endif |
1580 }; | 1587 }; |
1581 | 1588 |
1582 } } // namespace v8::internal | 1589 } } // namespace v8::internal |
1583 | 1590 |
1584 #endif // V8_X64_ASSEMBLER_X64_H_ | 1591 #endif // V8_X64_ASSEMBLER_X64_H_ |
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