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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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| 482 // The relocation writer's position must be kGap bytes above the end of | 482 // The relocation writer's position must be kGap bytes above the end of |
| 483 // the generated instructions. This leaves enough space for the | 483 // the generated instructions. This leaves enough space for the |
| 484 // longest possible ia32 instruction, 15 bytes, and the longest possible | 484 // longest possible ia32 instruction, 15 bytes, and the longest possible |
| 485 // relocation information encoding, RelocInfoWriter::kMaxLength == 16. | 485 // relocation information encoding, RelocInfoWriter::kMaxLength == 16. |
| 486 // (There is a 15 byte limit on ia32 instruction length that rules out some | 486 // (There is a 15 byte limit on ia32 instruction length that rules out some |
| 487 // otherwise valid instructions.) | 487 // otherwise valid instructions.) |
| 488 // This allows for a single, fast space check per instruction. | 488 // This allows for a single, fast space check per instruction. |
| 489 static const int kGap = 32; | 489 static const int kGap = 32; |
| 490 | 490 |
| 491 public: | 491 public: |
| 492 using AssemblerBase::FlushICache; |
| 493 using AssemblerBase::FlushICacheWithoutIsolate; |
| 494 |
| 492 // Create an assembler. Instructions and relocation information are emitted | 495 // Create an assembler. Instructions and relocation information are emitted |
| 493 // into a buffer, with the instructions starting from the beginning and the | 496 // into a buffer, with the instructions starting from the beginning and the |
| 494 // relocation information starting from the end of the buffer. See CodeDesc | 497 // relocation information starting from the end of the buffer. See CodeDesc |
| 495 // for a detailed comment on the layout (globals.h). | 498 // for a detailed comment on the layout (globals.h). |
| 496 // | 499 // |
| 497 // If the provided buffer is NULL, the assembler allocates and grows its own | 500 // If the provided buffer is NULL, the assembler allocates and grows its own |
| 498 // buffer, and buffer_size determines the initial buffer size. The buffer is | 501 // buffer, and buffer_size determines the initial buffer size. The buffer is |
| 499 // owned by the assembler and deallocated upon destruction of the assembler. | 502 // owned by the assembler and deallocated upon destruction of the assembler. |
| 500 // | 503 // |
| 501 // If the provided buffer is not NULL, the assembler uses the provided buffer | 504 // If the provided buffer is not NULL, the assembler uses the provided buffer |
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| 1591 private: | 1594 private: |
| 1592 Assembler* assembler_; | 1595 Assembler* assembler_; |
| 1593 #ifdef DEBUG | 1596 #ifdef DEBUG |
| 1594 int space_before_; | 1597 int space_before_; |
| 1595 #endif | 1598 #endif |
| 1596 }; | 1599 }; |
| 1597 | 1600 |
| 1598 } } // namespace v8::internal | 1601 } } // namespace v8::internal |
| 1599 | 1602 |
| 1600 #endif // V8_IA32_ASSEMBLER_IA32_H_ | 1603 #endif // V8_IA32_ASSEMBLER_IA32_H_ |
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