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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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386 } | 386 } |
387 | 387 |
388 private: | 388 private: |
389 int32_t offset_; | 389 int32_t offset_; |
390 | 390 |
391 friend class Assembler; | 391 friend class Assembler; |
392 }; | 392 }; |
393 | 393 |
394 | 394 |
395 // CpuFeatures keeps track of which features are supported by the target CPU. | 395 // CpuFeatures keeps track of which features are supported by the target CPU. |
396 // Supported features must be enabled by a Scope before use. | 396 // Supported features must be enabled by a CpuFeatureScope before use. |
397 class CpuFeatures : public AllStatic { | 397 class CpuFeatures : public AllStatic { |
398 public: | 398 public: |
399 // Detect features of the target CPU. Set safe defaults if the serializer | 399 // Detect features of the target CPU. Set safe defaults if the serializer |
400 // is enabled (snapshots must be portable). | 400 // is enabled (snapshots must be portable). |
401 static void Probe(); | 401 static void Probe(); |
402 | 402 |
403 // Check whether a feature is supported by the target CPU. | 403 // Check whether a feature is supported by the target CPU. |
404 static bool IsSupported(CpuFeature f) { | 404 static bool IsSupported(CpuFeature f) { |
405 ASSERT(initialized_); | 405 ASSERT(initialized_); |
406 if (f == FPU && !FLAG_enable_fpu) return false; | 406 if (f == FPU && !FLAG_enable_fpu) return false; |
407 return (supported_ & (1u << f)) != 0; | 407 return (supported_ & (1u << f)) != 0; |
408 } | 408 } |
409 | 409 |
410 | 410 static bool IsFoundByRuntimeProbingOnly(CpuFeature f) { |
411 #ifdef DEBUG | |
412 // Check whether a feature is currently enabled. | |
413 static bool IsEnabled(CpuFeature f) { | |
414 ASSERT(initialized_); | 411 ASSERT(initialized_); |
415 Isolate* isolate = Isolate::UncheckedCurrent(); | 412 return (found_by_runtime_probing_only_ & |
416 if (isolate == NULL) { | 413 (static_cast<uint64_t>(1) << f)) != 0; |
417 // When no isolate is available, work as if we're running in | |
418 // release mode. | |
419 return IsSupported(f); | |
420 } | |
421 unsigned enabled = static_cast<unsigned>(isolate->enabled_cpu_features()); | |
422 return (enabled & (1u << f)) != 0; | |
423 } | 414 } |
424 #endif | |
425 | |
426 // Enable a specified feature within a scope. | |
427 class Scope BASE_EMBEDDED { | |
428 #ifdef DEBUG | |
429 | |
430 public: | |
431 explicit Scope(CpuFeature f) { | |
432 unsigned mask = 1u << f; | |
433 ASSERT(CpuFeatures::IsSupported(f)); | |
434 ASSERT(!Serializer::enabled() || | |
435 (CpuFeatures::found_by_runtime_probing_ & mask) == 0); | |
436 isolate_ = Isolate::UncheckedCurrent(); | |
437 old_enabled_ = 0; | |
438 if (isolate_ != NULL) { | |
439 old_enabled_ = static_cast<unsigned>(isolate_->enabled_cpu_features()); | |
440 isolate_->set_enabled_cpu_features(old_enabled_ | mask); | |
441 } | |
442 } | |
443 ~Scope() { | |
444 ASSERT_EQ(Isolate::UncheckedCurrent(), isolate_); | |
445 if (isolate_ != NULL) { | |
446 isolate_->set_enabled_cpu_features(old_enabled_); | |
447 } | |
448 } | |
449 | |
450 private: | |
451 Isolate* isolate_; | |
452 unsigned old_enabled_; | |
453 #else | |
454 | |
455 public: | |
456 explicit Scope(CpuFeature f) {} | |
457 #endif | |
458 }; | |
459 | 415 |
460 class TryForceFeatureScope BASE_EMBEDDED { | 416 class TryForceFeatureScope BASE_EMBEDDED { |
461 public: | 417 public: |
462 explicit TryForceFeatureScope(CpuFeature f) | 418 explicit TryForceFeatureScope(CpuFeature f) |
463 : old_supported_(CpuFeatures::supported_) { | 419 : old_supported_(CpuFeatures::supported_) { |
464 if (CanForce()) { | 420 if (CanForce()) { |
465 CpuFeatures::supported_ |= (1u << f); | 421 CpuFeatures::supported_ |= (1u << f); |
466 } | 422 } |
467 } | 423 } |
468 | 424 |
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481 } | 437 } |
482 | 438 |
483 const unsigned old_supported_; | 439 const unsigned old_supported_; |
484 }; | 440 }; |
485 | 441 |
486 private: | 442 private: |
487 #ifdef DEBUG | 443 #ifdef DEBUG |
488 static bool initialized_; | 444 static bool initialized_; |
489 #endif | 445 #endif |
490 static unsigned supported_; | 446 static unsigned supported_; |
491 static unsigned found_by_runtime_probing_; | 447 static unsigned found_by_runtime_probing_only_; |
492 | 448 |
493 friend class ExternalReference; | 449 friend class ExternalReference; |
494 DISALLOW_COPY_AND_ASSIGN(CpuFeatures); | 450 DISALLOW_COPY_AND_ASSIGN(CpuFeatures); |
495 }; | 451 }; |
496 | 452 |
497 | 453 |
498 class Assembler : public AssemblerBase { | 454 class Assembler : public AssemblerBase { |
499 public: | 455 public: |
500 // Create an assembler. Instructions and relocation information are emitted | 456 // Create an assembler. Instructions and relocation information are emitted |
501 // into a buffer, with the instructions starting from the beginning and the | 457 // into a buffer, with the instructions starting from the beginning and the |
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1273 class EnsureSpace BASE_EMBEDDED { | 1229 class EnsureSpace BASE_EMBEDDED { |
1274 public: | 1230 public: |
1275 explicit EnsureSpace(Assembler* assembler) { | 1231 explicit EnsureSpace(Assembler* assembler) { |
1276 assembler->CheckBuffer(); | 1232 assembler->CheckBuffer(); |
1277 } | 1233 } |
1278 }; | 1234 }; |
1279 | 1235 |
1280 } } // namespace v8::internal | 1236 } } // namespace v8::internal |
1281 | 1237 |
1282 #endif // V8_ARM_ASSEMBLER_MIPS_H_ | 1238 #endif // V8_ARM_ASSEMBLER_MIPS_H_ |
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