1/*
2 * Copyright (C) 2017-2018 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#pragma once
27
28#include "BlockDirectory.h"
29#include "Subspace.h"
30#include "SubspaceAccess.h"
31#include <wtf/SinglyLinkedListWithTail.h>
32
33namespace JSC {
34
35class IsoAlignedMemoryAllocator;
36class IsoCellSet;
37
38class IsoSubspace : public Subspace {
39public:
40 JS_EXPORT_PRIVATE IsoSubspace(CString name, Heap&, HeapCellType*, size_t size, uint8_t numberOfLowerTierCells);
41 JS_EXPORT_PRIVATE ~IsoSubspace();
42
43 size_t cellSize() { return m_directory.cellSize(); }
44
45 Allocator allocatorFor(size_t, AllocatorForMode) override;
46 Allocator allocatorForNonVirtual(size_t, AllocatorForMode);
47
48 void* allocate(VM&, size_t, GCDeferralContext*, AllocationFailureMode) override;
49 void* allocateNonVirtual(VM&, size_t, GCDeferralContext*, AllocationFailureMode);
50
51 void sweepLowerTierCell(PreciseAllocation*);
52 void clearIsoCellSetBit(PreciseAllocation*);
53
54 void* tryAllocateFromLowerTier();
55 void destroyLowerTierFreeList();
56
57 void sweep();
58
59private:
60 friend class IsoCellSet;
61
62 void didResizeBits(size_t newSize) override;
63 void didRemoveBlock(size_t blockIndex) override;
64 void didBeginSweepingToFreeList(MarkedBlock::Handle*) override;
65
66 BlockDirectory m_directory;
67 LocalAllocator m_localAllocator;
68 std::unique_ptr<IsoAlignedMemoryAllocator> m_isoAlignedMemoryAllocator;
69 SentinelLinkedList<PreciseAllocation, PackedRawSentinelNode<PreciseAllocation>> m_lowerTierFreeList;
70 SentinelLinkedList<IsoCellSet, PackedRawSentinelNode<IsoCellSet>> m_cellSets;
71};
72
73ALWAYS_INLINE Allocator IsoSubspace::allocatorForNonVirtual(size_t size, AllocatorForMode)
74{
75 RELEASE_ASSERT(WTF::roundUpToMultipleOf<MarkedBlock::atomSize>(size) == cellSize());
76 return Allocator(&m_localAllocator);
77}
78
79#define ISO_SUBSPACE_INIT(heap, heapCellType, type) ("Isolated " #type " Space", (heap), (heapCellType), sizeof(type), type::numberOfLowerTierCells)
80
81template<typename T>
82struct isAllocatedFromIsoSubspace {
83 static constexpr bool value = std::is_same<std::result_of_t<decltype(T::template subspaceFor<T, SubspaceAccess::OnMainThread>)&(VM&)>, IsoSubspace*>::value;
84};
85
86} // namespace JSC
87
88