#pragma once
#include "BlockDirectory.h"
#include "Subspace.h"
#include "SubspaceAccess.h"
#include <wtf/SinglyLinkedListWithTail.h>
namespace JSC {
class IsoAlignedMemoryAllocator;
class IsoCellSet;
class IsoSubspace : public Subspace {
public:
JS_EXPORT_PRIVATE IsoSubspace(CString name, Heap&, HeapCellType*, size_t size, uint8_t numberOfLowerTierCells);
JS_EXPORT_PRIVATE ~IsoSubspace() override;
size_t cellSize() { return m_directory.cellSize(); }
Allocator allocatorFor(size_t, AllocatorForMode) override;
Allocator allocatorForNonVirtual(size_t, AllocatorForMode);
void* allocate(VM&, size_t, GCDeferralContext*, AllocationFailureMode) override;
void* allocateNonVirtual(VM&, size_t, GCDeferralContext*, AllocationFailureMode);
void sweepLowerTierCell(PreciseAllocation*);
void clearIsoCellSetBit(PreciseAllocation*);
void* tryAllocateFromLowerTier();
void destroyLowerTierFreeList();
void sweep();
template<typename Func> void forEachLowerTierFreeListedPreciseAllocation(const Func&);
private:
friend class IsoCellSet;
void didResizeBits(unsigned newSize) override;
void didRemoveBlock(unsigned blockIndex) override;
void didBeginSweepingToFreeList(MarkedBlock::Handle*) override;
BlockDirectory m_directory;
LocalAllocator m_localAllocator;
std::unique_ptr<IsoAlignedMemoryAllocator> m_isoAlignedMemoryAllocator;
SentinelLinkedList<PreciseAllocation, PackedRawSentinelNode<PreciseAllocation>> m_lowerTierFreeList;
SentinelLinkedList<IsoCellSet, PackedRawSentinelNode<IsoCellSet>> m_cellSets;
};
ALWAYS_INLINE Allocator IsoSubspace::allocatorForNonVirtual(size_t size, AllocatorForMode)
{
RELEASE_ASSERT(WTF::roundUpToMultipleOf<MarkedBlock::atomSize>(size) == cellSize());
return Allocator(&m_localAllocator);
}
#define ISO_SUBSPACE_INIT(heap, heapCellType, type) ("Isolated " #type " Space", (heap), (heapCellType), sizeof(type), type::numberOfLowerTierCells)
template<typename T>
struct isAllocatedFromIsoSubspace {
static constexpr bool value = std::is_same<std::result_of_t<decltype(T::template subspaceFor<T, SubspaceAccess::OnMainThread>)&(VM&)>, IsoSubspace*>::value;
};
}