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 <wtf/SinglyLinkedListWithTail.h>
31
32namespace JSC {
33
34class IsoAlignedMemoryAllocator;
35class IsoCellSet;
36
37class IsoSubspace : public Subspace {
38public:
39 JS_EXPORT_PRIVATE IsoSubspace(CString name, Heap&, HeapCellType*, size_t size);
40 JS_EXPORT_PRIVATE ~IsoSubspace();
41
42 size_t size() const { return m_size; }
43
44 Allocator allocatorFor(size_t, AllocatorForMode) override;
45 Allocator allocatorForNonVirtual(size_t, AllocatorForMode);
46
47 void* allocate(VM&, size_t, GCDeferralContext*, AllocationFailureMode) override;
48 void* allocateNonVirtual(VM&, size_t, GCDeferralContext*, AllocationFailureMode);
49
50private:
51 friend class IsoCellSet;
52
53 void didResizeBits(size_t newSize) override;
54 void didRemoveBlock(size_t blockIndex) override;
55 void didBeginSweepingToFreeList(MarkedBlock::Handle*) override;
56
57 size_t m_size;
58 BlockDirectory m_directory;
59 LocalAllocator m_localAllocator;
60 std::unique_ptr<IsoAlignedMemoryAllocator> m_isoAlignedMemoryAllocator;
61 SentinelLinkedList<IsoCellSet, BasicRawSentinelNode<IsoCellSet>> m_cellSets;
62};
63
64ALWAYS_INLINE Allocator IsoSubspace::allocatorForNonVirtual(size_t size, AllocatorForMode)
65{
66 RELEASE_ASSERT(size == this->size());
67 return Allocator(&m_localAllocator);
68}
69
70#define ISO_SUBSPACE_INIT(heap, heapCellType, type) ("Isolated " #type " Space", (heap), (heapCellType), sizeof(type))
71
72} // namespace JSC
73
74