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Side by Side Diff: third_party/WebKit/Source/platform/heap/HeapPage.h

Issue 1393863004: Oilpan: always shrink tail-allocated backing storage (reland.) (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Created 5 years, 2 months ago
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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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774 Address allocateObject(size_t allocationSize, size_t gcInfoIndex); 774 Address allocateObject(size_t allocationSize, size_t gcInfoIndex);
775 775
776 void freePage(NormalPage*); 776 void freePage(NormalPage*);
777 777
778 bool coalesce(); 778 bool coalesce();
779 void promptlyFreeObject(HeapObjectHeader*); 779 void promptlyFreeObject(HeapObjectHeader*);
780 bool expandObject(HeapObjectHeader*, size_t); 780 bool expandObject(HeapObjectHeader*, size_t);
781 bool shrinkObject(HeapObjectHeader*, size_t); 781 bool shrinkObject(HeapObjectHeader*, size_t);
782 void decreasePromptlyFreedSize(size_t size) { m_promptlyFreedSize -= size; } 782 void decreasePromptlyFreedSize(size_t size) { m_promptlyFreedSize -= size; }
783 783
784 bool isObjectAllocatedLast(HeapObjectHeader* header)
785 {
786 return header->payloadEnd() == m_currentAllocationPoint;
787 }
788
784 private: 789 private:
785 void allocatePage(); 790 void allocatePage();
786 Address lazySweepPages(size_t, size_t gcInfoIndex) override; 791 Address lazySweepPages(size_t, size_t gcInfoIndex) override;
787 Address outOfLineAllocate(size_t allocationSize, size_t gcInfoIndex); 792 Address outOfLineAllocate(size_t allocationSize, size_t gcInfoIndex);
788 Address currentAllocationPoint() const { return m_currentAllocationPoint; } 793 Address currentAllocationPoint() const { return m_currentAllocationPoint; }
789 size_t remainingAllocationSize() const { return m_remainingAllocationSize; } 794 size_t remainingAllocationSize() const { return m_remainingAllocationSize; }
790 bool hasCurrentAllocationArea() const { return currentAllocationPoint() && r emainingAllocationSize(); } 795 bool hasCurrentAllocationArea() const { return currentAllocationPoint() && r emainingAllocationSize(); }
791 void setAllocationPoint(Address, size_t); 796 void setAllocationPoint(Address, size_t);
792 void updateRemainingAllocationSize(); 797 void updateRemainingAllocationSize();
793 Address allocateFromFreeList(size_t, size_t gcInfoIndex); 798 Address allocateFromFreeList(size_t, size_t gcInfoIndex);
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942 SET_MEMORY_ACCESSIBLE(result, allocationSize - sizeof(HeapObjectHeader)) ; 947 SET_MEMORY_ACCESSIBLE(result, allocationSize - sizeof(HeapObjectHeader)) ;
943 ASSERT(findPageFromAddress(headerAddress + allocationSize - 1)); 948 ASSERT(findPageFromAddress(headerAddress + allocationSize - 1));
944 return result; 949 return result;
945 } 950 }
946 return outOfLineAllocate(allocationSize, gcInfoIndex); 951 return outOfLineAllocate(allocationSize, gcInfoIndex);
947 } 952 }
948 953
949 } // namespace blink 954 } // namespace blink
950 955
951 #endif // HeapPage_h 956 #endif // HeapPage_h
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