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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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30 | 30 |
31 // The original source code covered by the above license above has been | 31 // The original source code covered by the above license above has been |
32 // modified significantly by Google Inc. | 32 // modified significantly by Google Inc. |
33 // Copyright 2011 the V8 project authors. All rights reserved. | 33 // Copyright 2011 the V8 project authors. All rights reserved. |
34 | 34 |
35 // A light-weight IA32 Assembler. | 35 // A light-weight IA32 Assembler. |
36 | 36 |
37 #ifndef V8_IA32_ASSEMBLER_IA32_H_ | 37 #ifndef V8_IA32_ASSEMBLER_IA32_H_ |
38 #define V8_IA32_ASSEMBLER_IA32_H_ | 38 #define V8_IA32_ASSEMBLER_IA32_H_ |
39 | 39 |
| 40 #include "isolate.h" |
40 #include "serialize.h" | 41 #include "serialize.h" |
41 | 42 |
42 namespace v8 { | 43 namespace v8 { |
43 namespace internal { | 44 namespace internal { |
44 | 45 |
45 // CPU Registers. | 46 // CPU Registers. |
46 // | 47 // |
47 // 1) We would prefer to use an enum, but enum values are assignment- | 48 // 1) We would prefer to use an enum, but enum values are assignment- |
48 // compatible with int, which has caused code-generation bugs. | 49 // compatible with int, which has caused code-generation bugs. |
49 // | 50 // |
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438 | 439 |
439 // CpuFeatures keeps track of which features are supported by the target CPU. | 440 // CpuFeatures keeps track of which features are supported by the target CPU. |
440 // Supported features must be enabled by a Scope before use. | 441 // Supported features must be enabled by a Scope before use. |
441 // Example: | 442 // Example: |
442 // if (CpuFeatures::IsSupported(SSE2)) { | 443 // if (CpuFeatures::IsSupported(SSE2)) { |
443 // CpuFeatures::Scope fscope(SSE2); | 444 // CpuFeatures::Scope fscope(SSE2); |
444 // // Generate SSE2 floating point code. | 445 // // Generate SSE2 floating point code. |
445 // } else { | 446 // } else { |
446 // // Generate standard x87 floating point code. | 447 // // Generate standard x87 floating point code. |
447 // } | 448 // } |
448 class CpuFeatures : public AllStatic { | 449 class CpuFeatures { |
449 public: | 450 public: |
450 // Detect features of the target CPU. If the portable flag is set, | 451 // Detect features of the target CPU. If the portable flag is set, |
451 // the method sets safe defaults if the serializer is enabled | 452 // the method sets safe defaults if the serializer is enabled |
452 // (snapshots must be portable). | 453 // (snapshots must be portable). |
453 static void Probe(bool portable); | 454 void Probe(bool portable); |
454 static void Clear() { supported_ = 0; } | 455 void Clear() { supported_ = 0; } |
455 | 456 |
456 // Check whether a feature is supported by the target CPU. | 457 // Check whether a feature is supported by the target CPU. |
457 static bool IsSupported(CpuFeature f) { | 458 bool IsSupported(CpuFeature f) const { |
458 if (f == SSE2 && !FLAG_enable_sse2) return false; | 459 if (f == SSE2 && !FLAG_enable_sse2) return false; |
459 if (f == SSE3 && !FLAG_enable_sse3) return false; | 460 if (f == SSE3 && !FLAG_enable_sse3) return false; |
460 if (f == SSE4_1 && !FLAG_enable_sse4_1) return false; | 461 if (f == SSE4_1 && !FLAG_enable_sse4_1) return false; |
461 if (f == CMOV && !FLAG_enable_cmov) return false; | 462 if (f == CMOV && !FLAG_enable_cmov) return false; |
462 if (f == RDTSC && !FLAG_enable_rdtsc) return false; | 463 if (f == RDTSC && !FLAG_enable_rdtsc) return false; |
463 return (supported_ & (static_cast<uint64_t>(1) << f)) != 0; | 464 return (supported_ & (static_cast<uint64_t>(1) << f)) != 0; |
464 } | 465 } |
465 // Check whether a feature is currently enabled. | 466 // Check whether a feature is currently enabled. |
466 static bool IsEnabled(CpuFeature f) { | 467 bool IsEnabled(CpuFeature f) const { |
467 return (enabled_ & (static_cast<uint64_t>(1) << f)) != 0; | 468 return (enabled_ & (static_cast<uint64_t>(1) << f)) != 0; |
468 } | 469 } |
469 // Enable a specified feature within a scope. | 470 // Enable a specified feature within a scope. |
470 class Scope BASE_EMBEDDED { | 471 class Scope BASE_EMBEDDED { |
471 #ifdef DEBUG | 472 #ifdef DEBUG |
472 public: | 473 public: |
473 explicit Scope(CpuFeature f) { | 474 explicit Scope(CpuFeature f) |
| 475 : cpu_features_(Isolate::Current()->cpu_features()), |
| 476 isolate_(Isolate::Current()) { |
474 uint64_t mask = static_cast<uint64_t>(1) << f; | 477 uint64_t mask = static_cast<uint64_t>(1) << f; |
475 ASSERT(CpuFeatures::IsSupported(f)); | 478 ASSERT(cpu_features_->IsSupported(f)); |
476 ASSERT(!Serializer::enabled() || (found_by_runtime_probing_ & mask) == 0); | 479 ASSERT(!Serializer::enabled() || |
477 old_enabled_ = CpuFeatures::enabled_; | 480 (cpu_features_->found_by_runtime_probing_ & mask) == 0); |
478 CpuFeatures::enabled_ |= mask; | 481 old_enabled_ = cpu_features_->enabled_; |
| 482 cpu_features_->enabled_ |= mask; |
479 } | 483 } |
480 ~Scope() { CpuFeatures::enabled_ = old_enabled_; } | 484 ~Scope() { |
| 485 ASSERT_EQ(Isolate::Current(), isolate_); |
| 486 cpu_features_->enabled_ = old_enabled_; |
| 487 } |
481 private: | 488 private: |
482 uint64_t old_enabled_; | 489 uint64_t old_enabled_; |
| 490 CpuFeatures* cpu_features_; |
| 491 Isolate* isolate_; |
483 #else | 492 #else |
484 public: | 493 public: |
485 explicit Scope(CpuFeature f) {} | 494 explicit Scope(CpuFeature f) {} |
486 #endif | 495 #endif |
487 }; | 496 }; |
| 497 |
488 private: | 498 private: |
489 static uint64_t supported_; | 499 CpuFeatures(); |
490 static uint64_t enabled_; | 500 |
491 static uint64_t found_by_runtime_probing_; | 501 uint64_t supported_; |
| 502 uint64_t enabled_; |
| 503 uint64_t found_by_runtime_probing_; |
| 504 |
| 505 friend class Isolate; |
| 506 |
| 507 DISALLOW_COPY_AND_ASSIGN(CpuFeatures); |
492 }; | 508 }; |
493 | 509 |
494 | 510 |
495 class Assembler : public Malloced { | 511 class Assembler : public Malloced { |
496 private: | 512 private: |
497 // We check before assembling an instruction that there is sufficient | 513 // We check before assembling an instruction that there is sufficient |
498 // space to write an instruction and its relocation information. | 514 // space to write an instruction and its relocation information. |
499 // The relocation writer's position must be kGap bytes above the end of | 515 // The relocation writer's position must be kGap bytes above the end of |
500 // the generated instructions. This leaves enough space for the | 516 // the generated instructions. This leaves enough space for the |
501 // longest possible ia32 instruction, 15 bytes, and the longest possible | 517 // longest possible ia32 instruction, 15 bytes, and the longest possible |
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1043 | 1059 |
1044 friend class CodePatcher; | 1060 friend class CodePatcher; |
1045 friend class EnsureSpace; | 1061 friend class EnsureSpace; |
1046 | 1062 |
1047 // Code buffer: | 1063 // Code buffer: |
1048 // The buffer into which code and relocation info are generated. | 1064 // The buffer into which code and relocation info are generated. |
1049 byte* buffer_; | 1065 byte* buffer_; |
1050 int buffer_size_; | 1066 int buffer_size_; |
1051 // True if the assembler owns the buffer, false if buffer is external. | 1067 // True if the assembler owns the buffer, false if buffer is external. |
1052 bool own_buffer_; | 1068 bool own_buffer_; |
1053 // A previously allocated buffer of kMinimalBufferSize bytes, or NULL. | |
1054 static byte* spare_buffer_; | |
1055 | 1069 |
1056 // code generation | 1070 // code generation |
1057 byte* pc_; // the program counter; moves forward | 1071 byte* pc_; // the program counter; moves forward |
1058 RelocInfoWriter reloc_info_writer; | 1072 RelocInfoWriter reloc_info_writer; |
1059 | 1073 |
1060 // push-pop elimination | 1074 // push-pop elimination |
1061 byte* last_pc_; | 1075 byte* last_pc_; |
1062 | 1076 |
1063 PositionsRecorder positions_recorder_; | 1077 PositionsRecorder positions_recorder_; |
1064 | 1078 |
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1091 private: | 1105 private: |
1092 Assembler* assembler_; | 1106 Assembler* assembler_; |
1093 #ifdef DEBUG | 1107 #ifdef DEBUG |
1094 int space_before_; | 1108 int space_before_; |
1095 #endif | 1109 #endif |
1096 }; | 1110 }; |
1097 | 1111 |
1098 } } // namespace v8::internal | 1112 } } // namespace v8::internal |
1099 | 1113 |
1100 #endif // V8_IA32_ASSEMBLER_IA32_H_ | 1114 #endif // V8_IA32_ASSEMBLER_IA32_H_ |
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