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 | |
38 | namespace bmalloc { |
39 | |
40 | Deallocator::Deallocator(Heap& heap) |
41 | : m_heap(heap) |
42 | { |
43 | BASSERT(!Environment::get()->isDebugHeapEnabled()); |
44 | } |
45 | |
46 | Deallocator::~Deallocator() |
47 | { |
48 | scavenge(); |
49 | } |
50 | |
51 | void Deallocator::scavenge() |
52 | { |
53 | std::unique_lock<Mutex> lock(Heap::mutex()); |
54 | |
55 | processObjectLog(lock); |
56 | m_heap.deallocateLineCache(lock, lineCache(lock)); |
57 | } |
58 | |
59 | void 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 | |
66 | void 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 | |