#include "config.h"
#include "MarkedBlock.h"
#include "JSCell.h"
#include "JSObject.h"
#include "JSZombie.h"
#include "ScopeChain.h"
namespace JSC {
MarkedBlock* MarkedBlock::create(JSGlobalData* globalData, size_t cellSize)
{
PageAllocationAligned allocation = PageAllocationAligned::allocate(blockSize, blockSize, OSAllocator::JSGCHeapPages);
if (!static_cast<bool>(allocation))
CRASH();
return new (allocation.base()) MarkedBlock(allocation, globalData, cellSize);
}
void MarkedBlock::destroy(MarkedBlock* block)
{
for (size_t i = block->firstAtom(); i < block->m_endAtom; i += block->m_atomsPerCell)
reinterpret_cast<JSCell*>(&block->atoms()[i])->~JSCell();
block->m_allocation.deallocate();
}
MarkedBlock::MarkedBlock(const PageAllocationAligned& allocation, JSGlobalData* globalData, size_t cellSize)
: m_nextAtom(firstAtom())
, m_allocation(allocation)
, m_heap(&globalData->heap)
, m_prev(0)
, m_next(0)
{
m_atomsPerCell = (cellSize + atomSize - 1) / atomSize;
m_endAtom = atomsPerBlock - m_atomsPerCell + 1;
Structure* dummyMarkableCellStructure = globalData->dummyMarkableCellStructure.get();
for (size_t i = firstAtom(); i < m_endAtom; i += m_atomsPerCell)
new (&atoms()[i]) JSCell(*globalData, dummyMarkableCellStructure, JSCell::CreatingEarlyCell);
}
void MarkedBlock::sweep()
{
Structure* dummyMarkableCellStructure = m_heap->globalData()->dummyMarkableCellStructure.get();
for (size_t i = firstAtom(); i < m_endAtom; i += m_atomsPerCell) {
if (m_marks.get(i))
continue;
JSCell* cell = reinterpret_cast<JSCell*>(&atoms()[i]);
#if ENABLE(JSC_ZOMBIES)
if (cell->structure() && cell->structure() != dummyMarkableCellStructure && !cell->isZombie()) {
const ClassInfo* info = cell->classInfo();
cell->~JSCell();
new (cell) JSZombie(*m_heap->globalData(), info, m_heap->globalData()->zombieStructure.get());
m_marks.set(i);
}
#else
cell->~JSCell();
new (cell) JSCell(*m_heap->globalData(), dummyMarkableCellStructure);
#endif
}
}
}