1/*
2 * Copyright (C) 2014-2017 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 "PerProcess.h"
27#include "VMHeap.h"
28#include <thread>
29
30namespace bmalloc {
31
32DEFINE_STATIC_PER_PROCESS_STORAGE(VMHeap);
33
34VMHeap::VMHeap(std::lock_guard<Mutex>&)
35{
36}
37
38LargeRange VMHeap::tryAllocateLargeChunk(size_t alignment, size_t size)
39{
40 // We allocate VM in aligned multiples to increase the chances that
41 // the OS will provide contiguous ranges that we can merge.
42 size_t roundedAlignment = roundUpToMultipleOf<chunkSize>(alignment);
43 if (roundedAlignment < alignment) // Check for overflow
44 return LargeRange();
45 alignment = roundedAlignment;
46
47 size_t roundedSize = roundUpToMultipleOf<chunkSize>(size);
48 if (roundedSize < size) // Check for overflow
49 return LargeRange();
50 size = roundedSize;
51
52 void* memory = tryVMAllocate(alignment, size);
53 if (!memory)
54 return LargeRange();
55
56 Chunk* chunk = static_cast<Chunk*>(memory);
57
58#if BOS(DARWIN)
59 PerProcess<Zone>::get()->addRange(Range(chunk->bytes(), size));
60#endif
61
62 return LargeRange(chunk->bytes(), size, 0, 0);
63}
64
65} // namespace bmalloc
66