1/*
2 * Copyright (C) 2017 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 "config.h"
27#include "IsoAlignedMemoryAllocator.h"
28#include "MarkedBlock.h"
29
30namespace JSC {
31
32IsoAlignedMemoryAllocator::IsoAlignedMemoryAllocator()
33{
34}
35
36IsoAlignedMemoryAllocator::~IsoAlignedMemoryAllocator()
37{
38 for (unsigned i = 0; i < m_blocks.size(); ++i) {
39 void* block = m_blocks[i];
40 if (!m_committed[i])
41 WTF::fastCommitAlignedMemory(block, MarkedBlock::blockSize);
42 fastAlignedFree(block);
43 }
44}
45
46void* IsoAlignedMemoryAllocator::tryAllocateAlignedMemory(size_t alignment, size_t size)
47{
48 // Since this is designed specially for IsoSubspace, we know that we will only be asked to
49 // allocate MarkedBlocks.
50 RELEASE_ASSERT(alignment == MarkedBlock::blockSize);
51 RELEASE_ASSERT(size == MarkedBlock::blockSize);
52
53 auto locker = holdLock(m_lock);
54
55 m_firstUncommitted = m_committed.findBit(m_firstUncommitted, false);
56 if (m_firstUncommitted < m_blocks.size()) {
57 m_committed[m_firstUncommitted] = true;
58 void* result = m_blocks[m_firstUncommitted];
59 WTF::fastCommitAlignedMemory(result, MarkedBlock::blockSize);
60 return result;
61 }
62
63 void* result = tryFastAlignedMalloc(MarkedBlock::blockSize, MarkedBlock::blockSize);
64 if (!result)
65 return nullptr;
66 unsigned index = m_blocks.size();
67 m_blocks.append(result);
68 m_blockIndices.add(result, index);
69 if (m_blocks.capacity() != m_committed.size())
70 m_committed.resize(m_blocks.capacity());
71 m_committed[index] = true;
72 return result;
73}
74
75void IsoAlignedMemoryAllocator::freeAlignedMemory(void* basePtr)
76{
77 auto locker = holdLock(m_lock);
78
79 auto iter = m_blockIndices.find(basePtr);
80 RELEASE_ASSERT(iter != m_blockIndices.end());
81 unsigned index = iter->value;
82 m_committed[index] = false;
83 m_firstUncommitted = std::min(index, m_firstUncommitted);
84 WTF::fastDecommitAlignedMemory(basePtr, MarkedBlock::blockSize);
85}
86
87void IsoAlignedMemoryAllocator::dump(PrintStream& out) const
88{
89 out.print("Iso(", RawPointer(this), ")");
90}
91
92void* IsoAlignedMemoryAllocator::tryAllocateMemory(size_t)
93{
94 RELEASE_ASSERT_NOT_REACHED();
95}
96
97void IsoAlignedMemoryAllocator::freeMemory(void*)
98{
99 RELEASE_ASSERT_NOT_REACHED();
100}
101
102void* IsoAlignedMemoryAllocator::tryReallocateMemory(void*, size_t)
103{
104 RELEASE_ASSERT_NOT_REACHED();
105}
106
107} // namespace JSC
108
109