1/*
2 * Copyright (C) 2019 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 "IsoSharedConfig.h"
29#include "IsoSharedPage.h"
30#include "StaticPerProcess.h"
31
32namespace bmalloc {
33
34class AllIsoHeaps;
35
36class VariadicBumpAllocator {
37public:
38 VariadicBumpAllocator() = default;
39
40 VariadicBumpAllocator(char* payloadEnd, unsigned remaining)
41 : m_payloadEnd(payloadEnd)
42 , m_remaining(remaining)
43 {
44 }
45
46 template<unsigned, typename Func>
47 void* allocate(const Func& slowPath);
48
49private:
50 char* m_payloadEnd { nullptr };
51 unsigned m_remaining { 0 };
52};
53
54class IsoSharedHeap : public StaticPerProcess<IsoSharedHeap> {
55public:
56 IsoSharedHeap(std::lock_guard<Mutex>&)
57 {
58 }
59
60 template<unsigned>
61 void* allocateNew(bool abortOnFailure);
62
63private:
64 template<unsigned>
65 void* allocateSlow(bool abortOnFailure);
66
67 IsoSharedPage* m_currentPage { nullptr };
68 VariadicBumpAllocator m_allocator;
69};
70DECLARE_STATIC_PER_PROCESS_STORAGE(IsoSharedHeap);
71
72} // namespace bmalloc
73
74
75