1/*
2 * Copyright (C) 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 "AllocationFailureMode.h"
29#include <climits>
30
31namespace JSC {
32
33class GCDeferralContext;
34class Heap;
35class LocalAllocator;
36
37// This abstracts how we refer to LocalAllocator so that we could eventually support thread-local
38// caches.
39
40class Allocator {
41public:
42 Allocator() { }
43
44 explicit Allocator(LocalAllocator* localAllocator)
45 : m_localAllocator(localAllocator)
46 {
47 }
48
49 void* allocate(Heap&, GCDeferralContext*, AllocationFailureMode) const;
50
51 unsigned cellSize() const;
52
53 LocalAllocator* localAllocator() const { return m_localAllocator; }
54
55 bool operator==(const Allocator& other) const { return m_localAllocator == other.localAllocator(); }
56 bool operator!=(const Allocator& other) const { return !(*this == other); }
57 explicit operator bool() const { return *this != Allocator(); }
58
59private:
60 LocalAllocator* m_localAllocator { nullptr };
61};
62
63} // namespace JSC
64
65