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/*
* Copyright (C) 2011 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "MarkedBlock.h"
#include "JSCell.h"
namespace JSC {
MarkedBlock* MarkedBlock::create(JSGlobalData* globalData)
{
PageAllocationAligned allocation = PageAllocationAligned::allocate(BLOCK_SIZE, BLOCK_SIZE, OSAllocator::JSGCHeapPages);
if (!static_cast<bool>(allocation))
CRASH();
return new (allocation.base()) MarkedBlock(allocation, globalData);
}
void MarkedBlock::destroy(MarkedBlock* block)
{
for (size_t i = 0; i < CELLS_PER_BLOCK; ++i)
reinterpret_cast<JSCell*>(&block->cells[i])->~JSCell();
block->m_allocation.deallocate();
}
MarkedBlock::MarkedBlock(const PageAllocationAligned& allocation, JSGlobalData* globalData)
: m_allocation(allocation)
, m_heap(&globalData->heap)
{
marked.set(CELLS_PER_BLOCK - 1);
Structure* dummyMarkableCellStructure = globalData->dummyMarkableCellStructure.get();
for (size_t i = 0; i < CELLS_PER_BLOCK; ++i)
new (&cells[i]) JSCell(dummyMarkableCellStructure);
}
void MarkedBlock::sweep()
{
#if !ENABLE(JSC_ZOMBIES)
Structure* dummyMarkableCellStructure = m_heap->globalData()->dummyMarkableCellStructure.get();
#endif
for (size_t i = 0; i < CELLS_PER_BLOCK; ++i) {
if (marked.get(i))
continue;
JSCell* cell = reinterpret_cast<JSCell*>(&cells[i]);
#if ENABLE(JSC_ZOMBIES)
if (!cell->isZombie()) {
const ClassInfo* info = cell->classInfo();
cell->~JSCell();
new (cell) JSZombie(info, JSZombie::leakedZombieStructure());
marked.set(i);
}
#else
cell->~JSCell();
new (cell) JSCell(dummyMarkableCellStructure);
#endif
}
}
} // namespace JSC
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