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1 /* | 1 /* |
2 * Copyright (C) 2013 Google Inc. All rights reserved. | 2 * Copyright (C) 2013 Google Inc. 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 | 8 * * Redistributions of source code must retain the above copyright |
9 * notice, this list of conditions and the following disclaimer. | 9 * notice, this list of conditions and the following disclaimer. |
10 * * Redistributions in binary form must reproduce the above | 10 * * Redistributions in binary form must reproduce the above |
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379 BasePage* next() const { return m_next; } | 379 BasePage* next() const { return m_next; } |
380 | 380 |
381 // virtual methods are slow. So performance-sensitive methods | 381 // virtual methods are slow. So performance-sensitive methods |
382 // should be defined as non-virtual methods on NormalPage and LargeObjectPag
e. | 382 // should be defined as non-virtual methods on NormalPage and LargeObjectPag
e. |
383 // The following methods are not performance-sensitive. | 383 // The following methods are not performance-sensitive. |
384 virtual size_t objectPayloadSizeForTesting() = 0; | 384 virtual size_t objectPayloadSizeForTesting() = 0; |
385 virtual bool isEmpty() = 0; | 385 virtual bool isEmpty() = 0; |
386 virtual void removeFromHeap() = 0; | 386 virtual void removeFromHeap() = 0; |
387 virtual void sweep() = 0; | 387 virtual void sweep() = 0; |
388 virtual void makeConsistentForGC() = 0; | 388 virtual void makeConsistentForGC() = 0; |
389 virtual void makeConsistentForMutator() = 0; | |
390 #if defined(ADDRESS_SANITIZER) | 389 #if defined(ADDRESS_SANITIZER) |
391 virtual void poisonUnmarkedObjects() = 0; | 390 virtual void poisonUnmarkedObjects() = 0; |
392 #endif | 391 #endif |
393 // Check if the given address points to an object in this | 392 // Check if the given address points to an object in this |
394 // heap page. If so, find the start of that object and mark it | 393 // heap page. If so, find the start of that object and mark it |
395 // using the given Visitor. Otherwise do nothing. The pointer must | 394 // using the given Visitor. Otherwise do nothing. The pointer must |
396 // be within the same aligned blinkPageSize as the this-pointer. | 395 // be within the same aligned blinkPageSize as the this-pointer. |
397 // | 396 // |
398 // This is used during conservative stack scanning to | 397 // This is used during conservative stack scanning to |
399 // conservatively mark all objects that could be referenced from | 398 // conservatively mark all objects that could be referenced from |
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467 bool containedInObjectPayload(Address address) | 466 bool containedInObjectPayload(Address address) |
468 { | 467 { |
469 return payload() <= address && address < payloadEnd(); | 468 return payload() <= address && address < payloadEnd(); |
470 } | 469 } |
471 | 470 |
472 virtual size_t objectPayloadSizeForTesting() override; | 471 virtual size_t objectPayloadSizeForTesting() override; |
473 virtual bool isEmpty() override; | 472 virtual bool isEmpty() override; |
474 virtual void removeFromHeap() override; | 473 virtual void removeFromHeap() override; |
475 virtual void sweep() override; | 474 virtual void sweep() override; |
476 virtual void makeConsistentForGC() override; | 475 virtual void makeConsistentForGC() override; |
477 virtual void makeConsistentForMutator() override; | |
478 #if defined(ADDRESS_SANITIZER) | 476 #if defined(ADDRESS_SANITIZER) |
479 virtual void poisonUnmarkedObjects() override; | 477 virtual void poisonUnmarkedObjects() override; |
480 #endif | 478 #endif |
481 virtual void checkAndMarkPointer(Visitor*, Address) override; | 479 virtual void checkAndMarkPointer(Visitor*, Address) override; |
482 virtual void markOrphaned() override; | 480 virtual void markOrphaned() override; |
483 #if ENABLE(GC_PROFILING) | 481 #if ENABLE(GC_PROFILING) |
484 const GCInfo* findGCInfo(Address) override; | 482 const GCInfo* findGCInfo(Address) override; |
485 void snapshot(TracedValue*, ThreadState::SnapshotInfo*) override; | 483 void snapshot(TracedValue*, ThreadState::SnapshotInfo*) override; |
486 void incrementMarkedObjectsAge() override; | 484 void incrementMarkedObjectsAge() override; |
487 void countMarkedObjects(ClassAgeCountsMap&) override; | 485 void countMarkedObjects(ClassAgeCountsMap&) override; |
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530 bool containedInObjectPayload(Address address) | 528 bool containedInObjectPayload(Address address) |
531 { | 529 { |
532 return payload() <= address && address < payloadEnd(); | 530 return payload() <= address && address < payloadEnd(); |
533 } | 531 } |
534 | 532 |
535 virtual size_t objectPayloadSizeForTesting() override; | 533 virtual size_t objectPayloadSizeForTesting() override; |
536 virtual bool isEmpty() override; | 534 virtual bool isEmpty() override; |
537 virtual void removeFromHeap() override; | 535 virtual void removeFromHeap() override; |
538 virtual void sweep() override; | 536 virtual void sweep() override; |
539 virtual void makeConsistentForGC() override; | 537 virtual void makeConsistentForGC() override; |
540 virtual void makeConsistentForMutator() override; | |
541 #if defined(ADDRESS_SANITIZER) | 538 #if defined(ADDRESS_SANITIZER) |
542 virtual void poisonUnmarkedObjects() override; | 539 virtual void poisonUnmarkedObjects() override; |
543 #endif | 540 #endif |
544 virtual void checkAndMarkPointer(Visitor*, Address) override; | 541 virtual void checkAndMarkPointer(Visitor*, Address) override; |
545 virtual void markOrphaned() override; | 542 virtual void markOrphaned() override; |
546 | 543 |
547 #if ENABLE(GC_PROFILING) | 544 #if ENABLE(GC_PROFILING) |
548 const GCInfo* findGCInfo(Address) override; | 545 const GCInfo* findGCInfo(Address) override; |
549 void snapshot(TracedValue*, ThreadState::SnapshotInfo*) override; | 546 void snapshot(TracedValue*, ThreadState::SnapshotInfo*) override; |
550 void incrementMarkedObjectsAge() override; | 547 void incrementMarkedObjectsAge() override; |
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689 void snapshot(TracedValue*, ThreadState::SnapshotInfo*); | 686 void snapshot(TracedValue*, ThreadState::SnapshotInfo*); |
690 virtual void snapshotFreeList(TracedValue&) { }; | 687 virtual void snapshotFreeList(TracedValue&) { }; |
691 | 688 |
692 void countMarkedObjects(ClassAgeCountsMap&) const; | 689 void countMarkedObjects(ClassAgeCountsMap&) const; |
693 void countObjectsToSweep(ClassAgeCountsMap&) const; | 690 void countObjectsToSweep(ClassAgeCountsMap&) const; |
694 void incrementMarkedObjectsAge(); | 691 void incrementMarkedObjectsAge(); |
695 #endif | 692 #endif |
696 | 693 |
697 virtual void clearFreeLists() { } | 694 virtual void clearFreeLists() { } |
698 void makeConsistentForGC(); | 695 void makeConsistentForGC(); |
699 void makeConsistentForMutator(); | |
700 #if ENABLE(ASSERT) | 696 #if ENABLE(ASSERT) |
701 virtual bool isConsistentForGC() = 0; | 697 virtual bool isConsistentForGC() = 0; |
702 #endif | 698 #endif |
703 size_t objectPayloadSizeForTesting(); | 699 size_t objectPayloadSizeForTesting(); |
704 void prepareHeapForTermination(); | 700 void prepareHeapForTermination(); |
705 void prepareForSweep(); | 701 void prepareForSweep(); |
706 #if defined(ADDRESS_SANITIZER) | 702 #if defined(ADDRESS_SANITIZER) |
707 void poisonUnmarkedObjects(); | 703 void poisonUnmarkedObjects(); |
708 #endif | 704 #endif |
709 Address lazySweep(size_t, size_t gcInfoIndex); | 705 Address lazySweep(size_t, size_t gcInfoIndex); |
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1300 size_t copySize = previousHeader->payloadSize(); | 1296 size_t copySize = previousHeader->payloadSize(); |
1301 if (copySize > size) | 1297 if (copySize > size) |
1302 copySize = size; | 1298 copySize = size; |
1303 memcpy(address, previous, copySize); | 1299 memcpy(address, previous, copySize); |
1304 return address; | 1300 return address; |
1305 } | 1301 } |
1306 | 1302 |
1307 } // namespace blink | 1303 } // namespace blink |
1308 | 1304 |
1309 #endif // Heap_h | 1305 #endif // Heap_h |
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