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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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| 1458 // an instruction or relocation information. | 1458 // an instruction or relocation information. |
| 1459 inline bool buffer_overflow() const { | 1459 inline bool buffer_overflow() const { |
| 1460 return pc_ >= reloc_info_writer.pos() - kGap; | 1460 return pc_ >= reloc_info_writer.pos() - kGap; |
| 1461 } | 1461 } |
| 1462 | 1462 |
| 1463 // Get the number of bytes available in the buffer. | 1463 // Get the number of bytes available in the buffer. |
| 1464 inline int available_space() const { return reloc_info_writer.pos() - pc_; } | 1464 inline int available_space() const { return reloc_info_writer.pos() - pc_; } |
| 1465 | 1465 |
| 1466 static bool IsNop(Address addr); | 1466 static bool IsNop(Address addr); |
| 1467 | 1467 |
| 1468 AssemblerPositionsRecorder* positions_recorder() { | |
| 1469 return &positions_recorder_; | |
| 1470 } | |
| 1471 | |
| 1472 int relocation_writer_size() { | 1468 int relocation_writer_size() { |
| 1473 return (buffer_ + buffer_size_) - reloc_info_writer.pos(); | 1469 return (buffer_ + buffer_size_) - reloc_info_writer.pos(); |
| 1474 } | 1470 } |
| 1475 | 1471 |
| 1476 // Avoid overflows for displacements etc. | 1472 // Avoid overflows for displacements etc. |
| 1477 static const int kMaximalBufferSize = 512*MB; | 1473 static const int kMaximalBufferSize = 512*MB; |
| 1478 | 1474 |
| 1479 byte byte_at(int pos) { return buffer_[pos]; } | 1475 byte byte_at(int pos) { return buffer_[pos]; } |
| 1480 void set_byte_at(int pos, byte value) { buffer_[pos] = value; } | 1476 void set_byte_at(int pos, byte value) { buffer_[pos] = value; } |
| 1481 | 1477 |
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| 1567 friend class CodePatcher; | 1563 friend class CodePatcher; |
| 1568 friend class EnsureSpace; | 1564 friend class EnsureSpace; |
| 1569 | 1565 |
| 1570 // Internal reference positions, required for (potential) patching in | 1566 // Internal reference positions, required for (potential) patching in |
| 1571 // GrowBuffer(); contains only those internal references whose labels | 1567 // GrowBuffer(); contains only those internal references whose labels |
| 1572 // are already bound. | 1568 // are already bound. |
| 1573 std::deque<int> internal_reference_positions_; | 1569 std::deque<int> internal_reference_positions_; |
| 1574 | 1570 |
| 1575 // code generation | 1571 // code generation |
| 1576 RelocInfoWriter reloc_info_writer; | 1572 RelocInfoWriter reloc_info_writer; |
| 1577 | |
| 1578 AssemblerPositionsRecorder positions_recorder_; | |
| 1579 friend class AssemblerPositionsRecorder; | |
| 1580 }; | 1573 }; |
| 1581 | 1574 |
| 1582 | 1575 |
| 1583 // Helper class that ensures that there is enough space for generating | 1576 // Helper class that ensures that there is enough space for generating |
| 1584 // instructions and relocation information. The constructor makes | 1577 // instructions and relocation information. The constructor makes |
| 1585 // sure that there is enough space and (in debug mode) the destructor | 1578 // sure that there is enough space and (in debug mode) the destructor |
| 1586 // checks that we did not generate too much. | 1579 // checks that we did not generate too much. |
| 1587 class EnsureSpace BASE_EMBEDDED { | 1580 class EnsureSpace BASE_EMBEDDED { |
| 1588 public: | 1581 public: |
| 1589 explicit EnsureSpace(Assembler* assembler) : assembler_(assembler) { | 1582 explicit EnsureSpace(Assembler* assembler) : assembler_(assembler) { |
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| 1604 Assembler* assembler_; | 1597 Assembler* assembler_; |
| 1605 #ifdef DEBUG | 1598 #ifdef DEBUG |
| 1606 int space_before_; | 1599 int space_before_; |
| 1607 #endif | 1600 #endif |
| 1608 }; | 1601 }; |
| 1609 | 1602 |
| 1610 } // namespace internal | 1603 } // namespace internal |
| 1611 } // namespace v8 | 1604 } // namespace v8 |
| 1612 | 1605 |
| 1613 #endif // V8_IA32_ASSEMBLER_IA32_H_ | 1606 #endif // V8_IA32_ASSEMBLER_IA32_H_ |
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