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 <wtf/PrintStream.h>
29#include <wtf/SinglyLinkedListWithTail.h>
30
31namespace JSC {
32
33class BlockDirectory;
34class Subspace;
35
36class AlignedMemoryAllocator {
37 WTF_MAKE_NONCOPYABLE(AlignedMemoryAllocator);
38 WTF_MAKE_FAST_ALLOCATED;
39public:
40 AlignedMemoryAllocator();
41 virtual ~AlignedMemoryAllocator();
42
43 virtual void* tryAllocateAlignedMemory(size_t alignment, size_t size) = 0;
44 virtual void freeAlignedMemory(void*) = 0;
45
46 virtual void dump(PrintStream&) const = 0;
47
48 void registerDirectory(BlockDirectory*);
49 BlockDirectory* firstDirectory() const { return m_directories.first(); }
50
51 void registerSubspace(Subspace*);
52
53 // Some of derived memory allocators do not have these features because they do not use them.
54 // For example, IsoAlignedMemoryAllocator does not have "realloc" feature since it never extends / shrinks the allocated memory region.
55 virtual void* tryAllocateMemory(size_t) = 0;
56 virtual void freeMemory(void*) = 0;
57 virtual void* tryReallocateMemory(void*, size_t) = 0;
58
59private:
60 SinglyLinkedListWithTail<BlockDirectory> m_directories;
61 SinglyLinkedListWithTail<Subspace> m_subspaces;
62};
63
64} // namespace WTF
65
66