1/*
2 * Copyright (C) 2014-2018 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#ifndef Deallocator_h
27#define Deallocator_h
28
29#include "BExport.h"
30#include "FixedVector.h"
31#include "SmallPage.h"
32#include <mutex>
33
34namespace bmalloc {
35
36class Heap;
37class Mutex;
38
39// Per-cache object deallocator.
40
41class Deallocator {
42public:
43 Deallocator(Heap&);
44 ~Deallocator();
45
46 void deallocate(void*);
47 void scavenge();
48
49 void processObjectLog(std::unique_lock<Mutex>&);
50
51 LineCache& lineCache(std::unique_lock<Mutex>&) { return m_lineCache; }
52
53private:
54 bool deallocateFastCase(void*);
55 BEXPORT void deallocateSlowCase(void*);
56
57 Heap& m_heap;
58 FixedVector<void*, deallocatorLogCapacity> m_objectLog;
59 LineCache m_lineCache; // The Heap removes items from this cache.
60};
61
62inline bool Deallocator::deallocateFastCase(void* object)
63{
64 BASSERT(mightBeLarge(nullptr));
65 if (mightBeLarge(object))
66 return false;
67
68 if (m_objectLog.size() == m_objectLog.capacity())
69 return false;
70
71 m_objectLog.push(object);
72 return true;
73}
74
75inline void Deallocator::deallocate(void* object)
76{
77 if (!deallocateFastCase(object))
78 deallocateSlowCase(object);
79}
80
81} // namespace bmalloc
82
83#endif // Deallocator_h
84