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#include "BAssert.h"
27#include "BInline.h"
28#include "Chunk.h"
29#include "Deallocator.h"
30#include "Environment.h"
31#include "Heap.h"
32#include "Object.h"
33#include "PerProcess.h"
34#include <algorithm>
35#include <cstdlib>
36#include <sys/mman.h>
37
38namespace bmalloc {
39
40Deallocator::Deallocator(Heap& heap)
41 : m_heap(heap)
42{
43 BASSERT(!Environment::get()->isDebugHeapEnabled());
44}
45
46Deallocator::~Deallocator()
47{
48 scavenge();
49}
50
51void Deallocator::scavenge()
52{
53 std::unique_lock<Mutex> lock(Heap::mutex());
54
55 processObjectLog(lock);
56 m_heap.deallocateLineCache(lock, lineCache(lock));
57}
58
59void Deallocator::processObjectLog(std::unique_lock<Mutex>& lock)
60{
61 for (Object object : m_objectLog)
62 m_heap.derefSmallLine(lock, object, lineCache(lock));
63 m_objectLog.clear();
64}
65
66void Deallocator::deallocateSlowCase(void* object)
67{
68 if (!object)
69 return;
70
71 std::unique_lock<Mutex> lock(Heap::mutex());
72 if (m_heap.isLarge(lock, object)) {
73 m_heap.deallocateLarge(lock, object);
74 return;
75 }
76
77 if (m_objectLog.size() == m_objectLog.capacity())
78 processObjectLog(lock);
79
80 m_objectLog.push(object);
81}
82
83} // namespace bmalloc
84