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1 // Copyright 2012 the V8 project authors. All rights reserved. | 1 // Copyright 2012 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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413 // optimized or inlined into optimized code, because we might bailout | 413 // optimized or inlined into optimized code, because we might bailout |
414 // into the unoptimized code again during deoptimization. | 414 // into the unoptimized code again during deoptimization. |
415 class CodeFlusher { | 415 class CodeFlusher { |
416 public: | 416 public: |
417 explicit CodeFlusher(Isolate* isolate) | 417 explicit CodeFlusher(Isolate* isolate) |
418 : isolate_(isolate), | 418 : isolate_(isolate), |
419 jsfunction_candidates_head_(NULL), | 419 jsfunction_candidates_head_(NULL), |
420 shared_function_info_candidates_head_(NULL) {} | 420 shared_function_info_candidates_head_(NULL) {} |
421 | 421 |
422 void AddCandidate(SharedFunctionInfo* shared_info) { | 422 void AddCandidate(SharedFunctionInfo* shared_info) { |
423 SetNextCandidate(shared_info, shared_function_info_candidates_head_); | 423 if (GetNextCandidate(shared_info) == NULL) { |
424 shared_function_info_candidates_head_ = shared_info; | 424 SetNextCandidate(shared_info, shared_function_info_candidates_head_); |
| 425 shared_function_info_candidates_head_ = shared_info; |
| 426 } |
425 } | 427 } |
426 | 428 |
427 void AddCandidate(JSFunction* function) { | 429 void AddCandidate(JSFunction* function) { |
428 ASSERT(function->code() == function->shared()->code()); | 430 ASSERT(function->code() == function->shared()->code()); |
429 SetNextCandidate(function, jsfunction_candidates_head_); | 431 if (GetNextCandidate(function)->IsUndefined()) { |
430 jsfunction_candidates_head_ = function; | 432 SetNextCandidate(function, jsfunction_candidates_head_); |
| 433 jsfunction_candidates_head_ = function; |
| 434 } |
431 } | 435 } |
432 | 436 |
| 437 void EvictCandidate(JSFunction* function); |
| 438 |
433 void ProcessCandidates() { | 439 void ProcessCandidates() { |
434 ProcessSharedFunctionInfoCandidates(); | 440 ProcessSharedFunctionInfoCandidates(); |
435 ProcessJSFunctionCandidates(); | 441 ProcessJSFunctionCandidates(); |
436 } | 442 } |
437 | 443 |
438 private: | 444 private: |
439 void ProcessJSFunctionCandidates(); | 445 void ProcessJSFunctionCandidates(); |
440 void ProcessSharedFunctionInfoCandidates(); | 446 void ProcessSharedFunctionInfoCandidates(); |
441 | 447 |
442 static JSFunction** GetNextCandidateField(JSFunction* candidate) { | |
443 return reinterpret_cast<JSFunction**>( | |
444 candidate->address() + JSFunction::kCodeEntryOffset); | |
445 } | |
446 | |
447 static JSFunction* GetNextCandidate(JSFunction* candidate) { | 448 static JSFunction* GetNextCandidate(JSFunction* candidate) { |
448 return *GetNextCandidateField(candidate); | 449 Object* next_candidate = candidate->next_function_link(); |
| 450 return reinterpret_cast<JSFunction*>(next_candidate); |
449 } | 451 } |
450 | 452 |
451 static void SetNextCandidate(JSFunction* candidate, | 453 static void SetNextCandidate(JSFunction* candidate, |
452 JSFunction* next_candidate) { | 454 JSFunction* next_candidate) { |
453 *GetNextCandidateField(candidate) = next_candidate; | 455 candidate->set_next_function_link(next_candidate); |
454 } | 456 } |
455 | 457 |
456 static SharedFunctionInfo** GetNextCandidateField( | 458 static void ClearNextCandidate(JSFunction* candidate, Object* undefined) { |
457 SharedFunctionInfo* candidate) { | 459 ASSERT(undefined->IsUndefined()); |
458 Code* code = candidate->code(); | 460 candidate->set_next_function_link(undefined, SKIP_WRITE_BARRIER); |
459 return reinterpret_cast<SharedFunctionInfo**>( | |
460 code->address() + Code::kGCMetadataOffset); | |
461 } | 461 } |
462 | 462 |
463 static SharedFunctionInfo* GetNextCandidate(SharedFunctionInfo* candidate) { | 463 static SharedFunctionInfo* GetNextCandidate(SharedFunctionInfo* candidate) { |
464 return reinterpret_cast<SharedFunctionInfo*>( | 464 Object* next_candidate = candidate->code()->gc_metadata(); |
465 candidate->code()->gc_metadata()); | 465 return reinterpret_cast<SharedFunctionInfo*>(next_candidate); |
466 } | 466 } |
467 | 467 |
468 static void SetNextCandidate(SharedFunctionInfo* candidate, | 468 static void SetNextCandidate(SharedFunctionInfo* candidate, |
469 SharedFunctionInfo* next_candidate) { | 469 SharedFunctionInfo* next_candidate) { |
470 candidate->code()->set_gc_metadata(next_candidate); | 470 candidate->code()->set_gc_metadata(next_candidate); |
471 } | 471 } |
472 | 472 |
| 473 static void ClearNextCandidate(SharedFunctionInfo* candidate) { |
| 474 candidate->code()->set_gc_metadata(NULL, SKIP_WRITE_BARRIER); |
| 475 } |
| 476 |
473 Isolate* isolate_; | 477 Isolate* isolate_; |
474 JSFunction* jsfunction_candidates_head_; | 478 JSFunction* jsfunction_candidates_head_; |
475 SharedFunctionInfo* shared_function_info_candidates_head_; | 479 SharedFunctionInfo* shared_function_info_candidates_head_; |
476 | 480 |
477 DISALLOW_COPY_AND_ASSIGN(CodeFlusher); | 481 DISALLOW_COPY_AND_ASSIGN(CodeFlusher); |
478 }; | 482 }; |
479 | 483 |
480 | 484 |
481 // Defined in isolate.h. | 485 // Defined in isolate.h. |
482 class ThreadLocalTop; | 486 class ThreadLocalTop; |
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833 | 837 |
834 friend class Heap; | 838 friend class Heap; |
835 }; | 839 }; |
836 | 840 |
837 | 841 |
838 const char* AllocationSpaceName(AllocationSpace space); | 842 const char* AllocationSpaceName(AllocationSpace space); |
839 | 843 |
840 } } // namespace v8::internal | 844 } } // namespace v8::internal |
841 | 845 |
842 #endif // V8_MARK_COMPACT_H_ | 846 #endif // V8_MARK_COMPACT_H_ |
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