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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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560 static const int kJSReturnSequenceLength = 13; | 560 static const int kJSReturnSequenceLength = 13; |
561 static const int kShortCallInstructionLength = 5; | 561 static const int kShortCallInstructionLength = 5; |
562 | 562 |
563 // The debug break slot must be able to contain a call instruction. | 563 // The debug break slot must be able to contain a call instruction. |
564 static const int kDebugBreakSlotLength = kCallInstructionLength; | 564 static const int kDebugBreakSlotLength = kCallInstructionLength; |
565 | 565 |
566 // One byte opcode for test eax,0xXXXXXXXX. | 566 // One byte opcode for test eax,0xXXXXXXXX. |
567 static const byte kTestEaxByte = 0xA9; | 567 static const byte kTestEaxByte = 0xA9; |
568 // One byte opcode for test al, 0xXX. | 568 // One byte opcode for test al, 0xXX. |
569 static const byte kTestAlByte = 0xA8; | 569 static const byte kTestAlByte = 0xA8; |
| 570 // One byte opcode for nop. |
| 571 static const byte kNopByte = 0x90; |
| 572 |
| 573 // One byte prefix for a short conditional jump. |
| 574 static const byte kJccShortPrefix = 0x70; |
| 575 static const byte kJncShortOpcode = kJccShortPrefix | not_carry; |
| 576 static const byte kJcShortOpcode = kJccShortPrefix | carry; |
| 577 |
| 578 |
570 | 579 |
571 // --------------------------------------------------------------------------- | 580 // --------------------------------------------------------------------------- |
572 // Code generation | 581 // Code generation |
573 // | 582 // |
574 // Function names correspond one-to-one to x64 instruction mnemonics. | 583 // Function names correspond one-to-one to x64 instruction mnemonics. |
575 // Unless specified otherwise, instructions operate on 64-bit operands. | 584 // Unless specified otherwise, instructions operate on 64-bit operands. |
576 // | 585 // |
577 // If we need versions of an assembly instruction that operate on different | 586 // If we need versions of an assembly instruction that operate on different |
578 // width arguments, we add a single-letter suffix specifying the width. | 587 // width arguments, we add a single-letter suffix specifying the width. |
579 // This is done for the following instructions: mov, cmp, inc, dec, | 588 // This is done for the following instructions: mov, cmp, inc, dec, |
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1564 private: | 1573 private: |
1565 Assembler* assembler_; | 1574 Assembler* assembler_; |
1566 #ifdef DEBUG | 1575 #ifdef DEBUG |
1567 int space_before_; | 1576 int space_before_; |
1568 #endif | 1577 #endif |
1569 }; | 1578 }; |
1570 | 1579 |
1571 } } // namespace v8::internal | 1580 } } // namespace v8::internal |
1572 | 1581 |
1573 #endif // V8_X64_ASSEMBLER_X64_H_ | 1582 #endif // V8_X64_ASSEMBLER_X64_H_ |
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