1/*
2 * Copyright (C) 2014 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 "FTLDataSection.h"
28
29#if ENABLE(FTL_JIT)
30
31#include <wtf/Assertions.h>
32#include <wtf/DataLog.h>
33#include <wtf/FastMalloc.h>
34
35namespace JSC { namespace FTL {
36
37DataSection::DataSection(size_t size, unsigned alignment)
38    : m_size(size)
39{
40    RELEASE_ASSERT(WTF::bitCount(alignment) == 1);
41
42    const unsigned nativeAlignment = 8;
43
44    alignment = std::max(nativeAlignment, alignment);
45
46    size_t allocatedSize = size + alignment - nativeAlignment;
47    m_allocationBase = fastMalloc(allocatedSize);
48
49    m_base = bitwise_cast<void*>(
50        (bitwise_cast<uintptr_t>(m_allocationBase) + alignment - 1) & ~static_cast<uintptr_t>(alignment - 1));
51
52    RELEASE_ASSERT(!(bitwise_cast<uintptr_t>(m_base) & (alignment - 1)));
53    RELEASE_ASSERT(bitwise_cast<uintptr_t>(m_base) + size <= bitwise_cast<uintptr_t>(m_allocationBase) + allocatedSize);
54}
55
56DataSection::~DataSection()
57{
58    fastFree(m_allocationBase);
59}
60
61} } // namespace JSC::FTL
62
63#endif // ENABLE(FTL_JIT)
64
65