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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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504 // buffer, and buffer_size determines the initial buffer size. The buffer is | 504 // buffer, and buffer_size determines the initial buffer size. The buffer is |
505 // owned by the assembler and deallocated upon destruction of the assembler. | 505 // owned by the assembler and deallocated upon destruction of the assembler. |
506 // | 506 // |
507 // If the provided buffer is not NULL, the assembler uses the provided buffer | 507 // If the provided buffer is not NULL, the assembler uses the provided buffer |
508 // for code generation and assumes its size to be buffer_size. If the buffer | 508 // for code generation and assumes its size to be buffer_size. If the buffer |
509 // is too small, a fatal error occurs. No deallocation of the buffer is done | 509 // is too small, a fatal error occurs. No deallocation of the buffer is done |
510 // upon destruction of the assembler. | 510 // upon destruction of the assembler. |
511 Assembler(void* buffer, int buffer_size); | 511 Assembler(void* buffer, int buffer_size); |
512 ~Assembler(); | 512 ~Assembler(); |
513 | 513 |
| 514 // Overrides the default provided by FLAG_debug_code. |
| 515 void set_emit_debug_code(bool value) { emit_debug_code_ = value; } |
| 516 |
514 // GetCode emits any pending (non-emitted) code and fills the descriptor | 517 // GetCode emits any pending (non-emitted) code and fills the descriptor |
515 // desc. GetCode() is idempotent; it returns the same result if no other | 518 // desc. GetCode() is idempotent; it returns the same result if no other |
516 // Assembler functions are invoked in between GetCode() calls. | 519 // Assembler functions are invoked in between GetCode() calls. |
517 void GetCode(CodeDesc* desc); | 520 void GetCode(CodeDesc* desc); |
518 | 521 |
519 // Read/Modify the code target in the relative branch/call instruction at pc. | 522 // Read/Modify the code target in the relative branch/call instruction at pc. |
520 // On the x64 architecture, we use relative jumps with a 32-bit displacement | 523 // On the x64 architecture, we use relative jumps with a 32-bit displacement |
521 // to jump to other Code objects in the Code space in the heap. | 524 // to jump to other Code objects in the Code space in the heap. |
522 // Jumps to C functions are done indirectly through a 64-bit register holding | 525 // Jumps to C functions are done indirectly through a 64-bit register holding |
523 // the absolute address of the target. | 526 // the absolute address of the target. |
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1343 inline int available_space() const { | 1346 inline int available_space() const { |
1344 return static_cast<int>(reloc_info_writer.pos() - pc_); | 1347 return static_cast<int>(reloc_info_writer.pos() - pc_); |
1345 } | 1348 } |
1346 | 1349 |
1347 static bool IsNop(Address addr) { return *addr == 0x90; } | 1350 static bool IsNop(Address addr) { return *addr == 0x90; } |
1348 | 1351 |
1349 // Avoid overflows for displacements etc. | 1352 // Avoid overflows for displacements etc. |
1350 static const int kMaximalBufferSize = 512*MB; | 1353 static const int kMaximalBufferSize = 512*MB; |
1351 static const int kMinimalBufferSize = 4*KB; | 1354 static const int kMinimalBufferSize = 4*KB; |
1352 | 1355 |
| 1356 protected: |
| 1357 bool emit_debug_code() const { return emit_debug_code_; } |
| 1358 |
1353 private: | 1359 private: |
1354 byte* addr_at(int pos) { return buffer_ + pos; } | 1360 byte* addr_at(int pos) { return buffer_ + pos; } |
1355 byte byte_at(int pos) { return buffer_[pos]; } | 1361 byte byte_at(int pos) { return buffer_[pos]; } |
1356 void set_byte_at(int pos, byte value) { buffer_[pos] = value; } | 1362 void set_byte_at(int pos, byte value) { buffer_[pos] = value; } |
1357 uint32_t long_at(int pos) { | 1363 uint32_t long_at(int pos) { |
1358 return *reinterpret_cast<uint32_t*>(addr_at(pos)); | 1364 return *reinterpret_cast<uint32_t*>(addr_at(pos)); |
1359 } | 1365 } |
1360 void long_at_put(int pos, uint32_t x) { | 1366 void long_at_put(int pos, uint32_t x) { |
1361 *reinterpret_cast<uint32_t*>(addr_at(pos)) = x; | 1367 *reinterpret_cast<uint32_t*>(addr_at(pos)) = x; |
1362 } | 1368 } |
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1548 | 1554 |
1549 // code generation | 1555 // code generation |
1550 byte* pc_; // the program counter; moves forward | 1556 byte* pc_; // the program counter; moves forward |
1551 RelocInfoWriter reloc_info_writer; | 1557 RelocInfoWriter reloc_info_writer; |
1552 | 1558 |
1553 List< Handle<Code> > code_targets_; | 1559 List< Handle<Code> > code_targets_; |
1554 // push-pop elimination | 1560 // push-pop elimination |
1555 byte* last_pc_; | 1561 byte* last_pc_; |
1556 | 1562 |
1557 PositionsRecorder positions_recorder_; | 1563 PositionsRecorder positions_recorder_; |
| 1564 |
| 1565 bool emit_debug_code_; |
| 1566 |
1558 friend class PositionsRecorder; | 1567 friend class PositionsRecorder; |
1559 }; | 1568 }; |
1560 | 1569 |
1561 | 1570 |
1562 // Helper class that ensures that there is enough space for generating | 1571 // Helper class that ensures that there is enough space for generating |
1563 // instructions and relocation information. The constructor makes | 1572 // instructions and relocation information. The constructor makes |
1564 // sure that there is enough space and (in debug mode) the destructor | 1573 // sure that there is enough space and (in debug mode) the destructor |
1565 // checks that we did not generate too much. | 1574 // checks that we did not generate too much. |
1566 class EnsureSpace BASE_EMBEDDED { | 1575 class EnsureSpace BASE_EMBEDDED { |
1567 public: | 1576 public: |
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1582 private: | 1591 private: |
1583 Assembler* assembler_; | 1592 Assembler* assembler_; |
1584 #ifdef DEBUG | 1593 #ifdef DEBUG |
1585 int space_before_; | 1594 int space_before_; |
1586 #endif | 1595 #endif |
1587 }; | 1596 }; |
1588 | 1597 |
1589 } } // namespace v8::internal | 1598 } } // namespace v8::internal |
1590 | 1599 |
1591 #endif // V8_X64_ASSEMBLER_X64_H_ | 1600 #endif // V8_X64_ASSEMBLER_X64_H_ |
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