2 * Copyright (C) 2011 Apple Inc. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
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15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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27 #include "MarkedBlock.h"
32 #include "ScopeChain.h"
36 MarkedBlock* MarkedBlock::create(JSGlobalData* globalData, size_t cellSize)
38 PageAllocationAligned allocation = PageAllocationAligned::allocate(blockSize, blockSize, OSAllocator::JSGCHeapPages);
39 if (!static_cast<bool>(allocation))
41 return new (allocation.base()) MarkedBlock(allocation, globalData, cellSize);
44 void MarkedBlock::destroy(MarkedBlock* block)
46 for (size_t i = block->firstAtom(); i < block->m_endAtom; i += block->m_atomsPerCell)
47 reinterpret_cast<JSCell*>(&block->atoms()[i])->~JSCell();
48 block->m_allocation.deallocate();
51 MarkedBlock::MarkedBlock(const PageAllocationAligned& allocation, JSGlobalData* globalData, size_t cellSize)
52 : m_nextAtom(firstAtom())
53 , m_allocation(allocation)
54 , m_heap(&globalData->heap)
58 m_atomsPerCell = (cellSize + atomSize - 1) / atomSize;
59 m_endAtom = atomsPerBlock - m_atomsPerCell + 1;
61 Structure* dummyMarkableCellStructure = globalData->dummyMarkableCellStructure.get();
62 for (size_t i = firstAtom(); i < m_endAtom; i += m_atomsPerCell)
63 new (&atoms()[i]) JSCell(*globalData, dummyMarkableCellStructure);
66 void MarkedBlock::sweep()
68 Structure* dummyMarkableCellStructure = m_heap->globalData()->dummyMarkableCellStructure.get();
70 for (size_t i = firstAtom(); i < m_endAtom; i += m_atomsPerCell) {
74 JSCell* cell = reinterpret_cast<JSCell*>(&atoms()[i]);
75 #if ENABLE(JSC_ZOMBIES)
76 if (cell->structure() && cell->structure() != dummyMarkableCellStructure && !cell->isZombie()) {
77 const ClassInfo* info = cell->classInfo();
79 new (cell) JSZombie(*m_heap->globalData(), info, m_heap->globalData()->zombieStructure.get());
84 new (cell) JSCell(*m_heap->globalData(), dummyMarkableCellStructure);