MarkedBlock* MarkedBlock::create(Heap* heap, size_t cellSize)
{
PageAllocationAligned allocation = PageAllocationAligned::allocate(blockSize, blockSize, OSAllocator::JSGCHeapPages);
if (!static_cast<bool>(allocation))
CRASH();
return new (NotNull, allocation.base()) MarkedBlock(allocation, heap, cellSize);
}
void PageAllocationAligned::deallocate()
{
// Clear base & size before calling release; if this is *inside* allocation
// then we won't be able to clear then after deallocating the memory.
PageAllocationAligned tmp;
std::swap(tmp, *this);
ASSERT(tmp);
ASSERT(!*this);
#if OS(DARWIN)
vm_deallocate(current_task(), reinterpret_cast<vm_address_t>(tmp.base()), tmp.size());
#else
ASSERT(tmp.m_reservation.contains(tmp.base(), tmp.size()));
OSAllocator::decommitAndRelease(tmp.m_reservation.base(), tmp.m_reservation.size());
#endif
}
CheckedBoolean CopiedSpace::tryAllocateOversize(size_t bytes, void** outPtr)
{
ASSERT(isOversize(bytes));
size_t blockSize = WTF::roundUpToMultipleOf(WTF::pageSize(), sizeof(CopiedBlock) + bytes);
PageAllocationAligned allocation = PageAllocationAligned::allocate(blockSize, WTF::pageSize(), OSAllocator::JSGCHeapPages);
if (!static_cast<bool>(allocation)) {
*outPtr = 0;
return false;
}
CopiedBlock* block = new (NotNull, allocation.base()) CopiedBlock(allocation);
m_oversizeBlocks.push(block);
m_oversizeFilter.add(reinterpret_cast<Bits>(block));
*outPtr = allocateFromBlock(block, bytes);
m_heap->didAllocate(blockSize);
return true;
}