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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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558 | 558 |
559 ptr = partitionCookieFreePointerAdjust(ptr); | 559 ptr = partitionCookieFreePointerAdjust(ptr); |
560 ASSERT(partitionPointerIsValid(ptr)); | 560 ASSERT(partitionPointerIsValid(ptr)); |
561 PartitionPage* page = partitionPointerToPage(ptr); | 561 PartitionPage* page = partitionPointerToPage(ptr); |
562 spinLockLock(&root->lock); | 562 spinLockLock(&root->lock); |
563 partitionFreeWithPage(ptr, page); | 563 partitionFreeWithPage(ptr, page); |
564 spinLockUnlock(&root->lock); | 564 spinLockUnlock(&root->lock); |
565 #endif | 565 #endif |
566 } | 566 } |
567 | 567 |
| 568 ALWAYS_INLINE bool partitionAllocSupportsGetSize() |
| 569 { |
| 570 #if defined(MEMORY_TOOL_REPLACES_ALLOCATOR) |
| 571 return false; |
| 572 #else |
| 573 return true; |
| 574 #endif |
| 575 } |
| 576 |
| 577 ALWAYS_INLINE size_t partitionAllocGetSize(void* ptr) |
| 578 { |
| 579 // No need to lock here. Only 'ptr' being freed by another thread could |
| 580 // cause trouble, and the caller is responsible for that not happening. |
| 581 ASSERT(partitionAllocSupportsGetSize()); |
| 582 ptr = partitionCookieFreePointerAdjust(ptr); |
| 583 ASSERT(partitionPointerIsValid(ptr)); |
| 584 PartitionPage* page = partitionPointerToPage(ptr); |
| 585 size_t size = page->bucket->slotSize; |
| 586 return partitionCookieSizeAdjustSubtract(size); |
| 587 } |
| 588 |
568 // N (or more accurately, N - sizeof(void*)) represents the largest size in | 589 // N (or more accurately, N - sizeof(void*)) represents the largest size in |
569 // bytes that will be handled by a SizeSpecificPartitionAllocator. | 590 // bytes that will be handled by a SizeSpecificPartitionAllocator. |
570 // Attempts to partitionAlloc() more than this amount will fail. | 591 // Attempts to partitionAlloc() more than this amount will fail. |
571 template <size_t N> | 592 template <size_t N> |
572 class SizeSpecificPartitionAllocator { | 593 class SizeSpecificPartitionAllocator { |
573 public: | 594 public: |
574 static const size_t kMaxAllocation = N - kAllocationGranularity; | 595 static const size_t kMaxAllocation = N - kAllocationGranularity; |
575 static const size_t kNumBuckets = N / kAllocationGranularity; | 596 static const size_t kNumBuckets = N / kAllocationGranularity; |
576 void init() { partitionAllocInit(&m_partitionRoot, kNumBuckets, kMaxAllocati
on); } | 597 void init() { partitionAllocInit(&m_partitionRoot, kNumBuckets, kMaxAllocati
on); } |
577 bool shutdown() { return partitionAllocShutdown(&m_partitionRoot); } | 598 bool shutdown() { return partitionAllocShutdown(&m_partitionRoot); } |
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595 using WTF::SizeSpecificPartitionAllocator; | 616 using WTF::SizeSpecificPartitionAllocator; |
596 using WTF::PartitionAllocatorGeneric; | 617 using WTF::PartitionAllocatorGeneric; |
597 using WTF::PartitionRoot; | 618 using WTF::PartitionRoot; |
598 using WTF::partitionAllocInit; | 619 using WTF::partitionAllocInit; |
599 using WTF::partitionAllocShutdown; | 620 using WTF::partitionAllocShutdown; |
600 using WTF::partitionAlloc; | 621 using WTF::partitionAlloc; |
601 using WTF::partitionFree; | 622 using WTF::partitionFree; |
602 using WTF::partitionAllocGeneric; | 623 using WTF::partitionAllocGeneric; |
603 using WTF::partitionFreeGeneric; | 624 using WTF::partitionFreeGeneric; |
604 using WTF::partitionReallocGeneric; | 625 using WTF::partitionReallocGeneric; |
| 626 using WTF::partitionAllocSupportsGetSize; |
| 627 using WTF::partitionAllocGetSize; |
605 | 628 |
606 #endif // WTF_PartitionAlloc_h | 629 #endif // WTF_PartitionAlloc_h |
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