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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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427 | 427 |
428 // CpuFeatures keeps track of which features are supported by the target CPU. | 428 // CpuFeatures keeps track of which features are supported by the target CPU. |
429 // Supported features must be enabled by a Scope before use. | 429 // Supported features must be enabled by a Scope before use. |
430 // Example: | 430 // Example: |
431 // if (CpuFeatures::IsSupported(SSE3)) { | 431 // if (CpuFeatures::IsSupported(SSE3)) { |
432 // CpuFeatures::Scope fscope(SSE3); | 432 // CpuFeatures::Scope fscope(SSE3); |
433 // // Generate SSE3 floating point code. | 433 // // Generate SSE3 floating point code. |
434 // } else { | 434 // } else { |
435 // // Generate standard x87 or SSE2 floating point code. | 435 // // Generate standard x87 or SSE2 floating point code. |
436 // } | 436 // } |
437 class CpuFeatures : public AllStatic { | 437 class CpuFeatures { |
438 public: | 438 public: |
439 // Detect features of the target CPU. Set safe defaults if the serializer | 439 // Detect features of the target CPU. Set safe defaults if the serializer |
440 // is enabled (snapshots must be portable). | 440 // is enabled (snapshots must be portable). |
441 static void Probe(bool portable); | 441 void Probe(bool portable); |
| 442 |
442 // Check whether a feature is supported by the target CPU. | 443 // Check whether a feature is supported by the target CPU. |
443 static bool IsSupported(CpuFeature f) { | 444 bool IsSupported(CpuFeature f) const { |
444 if (f == SSE2 && !FLAG_enable_sse2) return false; | 445 if (f == SSE2 && !FLAG_enable_sse2) return false; |
445 if (f == SSE3 && !FLAG_enable_sse3) return false; | 446 if (f == SSE3 && !FLAG_enable_sse3) return false; |
446 if (f == CMOV && !FLAG_enable_cmov) return false; | 447 if (f == CMOV && !FLAG_enable_cmov) return false; |
447 if (f == RDTSC && !FLAG_enable_rdtsc) return false; | 448 if (f == RDTSC && !FLAG_enable_rdtsc) return false; |
448 if (f == SAHF && !FLAG_enable_sahf) return false; | 449 if (f == SAHF && !FLAG_enable_sahf) return false; |
449 return (supported_ & (V8_UINT64_C(1) << f)) != 0; | 450 return (supported_ & (V8_UINT64_C(1) << f)) != 0; |
450 } | 451 } |
451 // Check whether a feature is currently enabled. | 452 // Check whether a feature is currently enabled. |
452 static bool IsEnabled(CpuFeature f) { | 453 bool IsEnabled(CpuFeature f) const { |
453 return (enabled_ & (V8_UINT64_C(1) << f)) != 0; | 454 return (enabled_ & (V8_UINT64_C(1) << f)) != 0; |
454 } | 455 } |
455 // Enable a specified feature within a scope. | 456 // Enable a specified feature within a scope. |
456 class Scope BASE_EMBEDDED { | 457 class Scope BASE_EMBEDDED { |
457 #ifdef DEBUG | 458 #ifdef DEBUG |
458 public: | 459 public: |
459 explicit Scope(CpuFeature f) { | 460 explicit Scope(CpuFeature f) |
| 461 : cpu_features_(Isolate::Current()->cpu_features()), |
| 462 isolate_(Isolate::Current()) { |
460 uint64_t mask = (V8_UINT64_C(1) << f); | 463 uint64_t mask = (V8_UINT64_C(1) << f); |
461 ASSERT(CpuFeatures::IsSupported(f)); | 464 ASSERT(cpu_features_->IsSupported(f)); |
462 ASSERT(!Serializer::enabled() || (found_by_runtime_probing_ & mask) == 0); | 465 ASSERT(!Serializer::enabled() || |
463 old_enabled_ = CpuFeatures::enabled_; | 466 (cpu_features_->found_by_runtime_probing_ & mask) == 0); |
464 CpuFeatures::enabled_ |= mask; | 467 old_enabled_ = cpu_features_->enabled_; |
| 468 cpu_features_->enabled_ |= mask; |
465 } | 469 } |
466 ~Scope() { CpuFeatures::enabled_ = old_enabled_; } | 470 ~Scope() { |
| 471 ASSERT_EQ(Isolate::Current(), isolate_); |
| 472 cpu_features_->enabled_ = old_enabled_; |
| 473 } |
467 private: | 474 private: |
468 uint64_t old_enabled_; | 475 uint64_t old_enabled_; |
| 476 CpuFeatures* cpu_features_; |
| 477 Isolate* isolate_; |
469 #else | 478 #else |
470 public: | 479 public: |
471 explicit Scope(CpuFeature f) {} | 480 explicit Scope(CpuFeature f) {} |
472 #endif | 481 #endif |
473 }; | 482 }; |
474 private: | 483 private: |
| 484 CpuFeatures(); |
| 485 |
475 // Safe defaults include SSE2 and CMOV for X64. It is always available, if | 486 // Safe defaults include SSE2 and CMOV for X64. It is always available, if |
476 // anyone checks, but they shouldn't need to check. | 487 // anyone checks, but they shouldn't need to check. |
| 488 // The required user mode extensions in X64 are (from AMD64 ABI Table A.1): |
| 489 // fpu, tsc, cx8, cmov, mmx, sse, sse2, fxsr, syscall |
477 static const uint64_t kDefaultCpuFeatures = (1 << SSE2 | 1 << CMOV); | 490 static const uint64_t kDefaultCpuFeatures = (1 << SSE2 | 1 << CMOV); |
478 static uint64_t supported_; | 491 |
479 static uint64_t enabled_; | 492 uint64_t supported_; |
480 static uint64_t found_by_runtime_probing_; | 493 uint64_t enabled_; |
| 494 uint64_t found_by_runtime_probing_; |
| 495 |
| 496 friend class Isolate; |
| 497 |
| 498 DISALLOW_COPY_AND_ASSIGN(CpuFeatures); |
481 }; | 499 }; |
482 | 500 |
483 | 501 |
484 class Assembler : public Malloced { | 502 class Assembler : public Malloced { |
485 private: | 503 private: |
486 // We check before assembling an instruction that there is sufficient | 504 // We check before assembling an instruction that there is sufficient |
487 // space to write an instruction and its relocation information. | 505 // space to write an instruction and its relocation information. |
488 // The relocation writer's position must be kGap bytes above the end of | 506 // The relocation writer's position must be kGap bytes above the end of |
489 // the generated instructions. This leaves enough space for the | 507 // the generated instructions. This leaves enough space for the |
490 // longest possible x64 instruction, 15 bytes, and the longest possible | 508 // longest possible x64 instruction, 15 bytes, and the longest possible |
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1542 friend class CodePatcher; | 1560 friend class CodePatcher; |
1543 friend class EnsureSpace; | 1561 friend class EnsureSpace; |
1544 friend class RegExpMacroAssemblerX64; | 1562 friend class RegExpMacroAssemblerX64; |
1545 | 1563 |
1546 // Code buffer: | 1564 // Code buffer: |
1547 // The buffer into which code and relocation info are generated. | 1565 // The buffer into which code and relocation info are generated. |
1548 byte* buffer_; | 1566 byte* buffer_; |
1549 int buffer_size_; | 1567 int buffer_size_; |
1550 // True if the assembler owns the buffer, false if buffer is external. | 1568 // True if the assembler owns the buffer, false if buffer is external. |
1551 bool own_buffer_; | 1569 bool own_buffer_; |
1552 // A previously allocated buffer of kMinimalBufferSize bytes, or NULL. | |
1553 static byte* spare_buffer_; | |
1554 | 1570 |
1555 // code generation | 1571 // code generation |
1556 byte* pc_; // the program counter; moves forward | 1572 byte* pc_; // the program counter; moves forward |
1557 RelocInfoWriter reloc_info_writer; | 1573 RelocInfoWriter reloc_info_writer; |
1558 | 1574 |
1559 List< Handle<Code> > code_targets_; | 1575 List< Handle<Code> > code_targets_; |
1560 // push-pop elimination | 1576 // push-pop elimination |
1561 byte* last_pc_; | 1577 byte* last_pc_; |
1562 | 1578 |
1563 PositionsRecorder positions_recorder_; | 1579 PositionsRecorder positions_recorder_; |
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1591 private: | 1607 private: |
1592 Assembler* assembler_; | 1608 Assembler* assembler_; |
1593 #ifdef DEBUG | 1609 #ifdef DEBUG |
1594 int space_before_; | 1610 int space_before_; |
1595 #endif | 1611 #endif |
1596 }; | 1612 }; |
1597 | 1613 |
1598 } } // namespace v8::internal | 1614 } } // namespace v8::internal |
1599 | 1615 |
1600 #endif // V8_X64_ASSEMBLER_X64_H_ | 1616 #endif // V8_X64_ASSEMBLER_X64_H_ |
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