mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
synced 2024-11-26 21:50:53 +00:00
90 lines
3.5 KiB
C++
90 lines
3.5 KiB
C++
/*
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* Copyright (C) 2017-2018 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include "BlockDirectory.h"
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#include "Subspace.h"
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#include "SubspaceAccess.h"
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#include <wtf/SinglyLinkedListWithTail.h>
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namespace JSC {
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class IsoAlignedMemoryAllocator;
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class IsoCellSet;
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class IsoSubspace : public Subspace {
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public:
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JS_EXPORT_PRIVATE IsoSubspace(CString name, Heap&, HeapCellType*, size_t size, uint8_t numberOfLowerTierCells);
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JS_EXPORT_PRIVATE ~IsoSubspace() override;
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size_t cellSize() { return m_directory.cellSize(); }
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Allocator allocatorFor(size_t, AllocatorForMode) override;
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Allocator allocatorForNonVirtual(size_t, AllocatorForMode);
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void* allocate(VM&, size_t, GCDeferralContext*, AllocationFailureMode) override;
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void* allocateNonVirtual(VM&, size_t, GCDeferralContext*, AllocationFailureMode);
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void sweepLowerTierCell(PreciseAllocation*);
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void clearIsoCellSetBit(PreciseAllocation*);
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void* tryAllocateFromLowerTier();
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void destroyLowerTierFreeList();
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void sweep();
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template<typename Func> void forEachLowerTierFreeListedPreciseAllocation(const Func&);
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private:
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friend class IsoCellSet;
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void didResizeBits(unsigned newSize) override;
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void didRemoveBlock(unsigned blockIndex) override;
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void didBeginSweepingToFreeList(MarkedBlock::Handle*) override;
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BlockDirectory m_directory;
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LocalAllocator m_localAllocator;
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std::unique_ptr<IsoAlignedMemoryAllocator> m_isoAlignedMemoryAllocator;
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SentinelLinkedList<PreciseAllocation, PackedRawSentinelNode<PreciseAllocation>> m_lowerTierFreeList;
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SentinelLinkedList<IsoCellSet, PackedRawSentinelNode<IsoCellSet>> m_cellSets;
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};
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ALWAYS_INLINE Allocator IsoSubspace::allocatorForNonVirtual(size_t size, AllocatorForMode)
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{
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RELEASE_ASSERT(WTF::roundUpToMultipleOf<MarkedBlock::atomSize>(size) == cellSize());
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return Allocator(&m_localAllocator);
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}
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#define ISO_SUBSPACE_INIT(heap, heapCellType, type) ("Isolated " #type " Space", (heap), (heapCellType), sizeof(type), type::numberOfLowerTierCells)
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template<typename T>
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struct isAllocatedFromIsoSubspace {
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static constexpr bool value = std::is_same<std::result_of_t<decltype(T::template subspaceFor<T, SubspaceAccess::OnMainThread>)&(VM&)>, IsoSubspace*>::value;
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};
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} // namespace JSC
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