1/*
2 * Copyright (C) 2013 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. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "SuperRegion.h"
28
29#include "Region.h"
30
31namespace JSC {
32
33const uint64_t SuperRegion::s_fixedHeapMemoryPoolSize = 4 * 1024 * static_cast<uint64_t>(MB);
34
35SuperRegion::SuperRegion()
36    : MetaAllocator(Region::s_regionSize, Region::s_regionSize)
37    , m_reservationBase(0)
38{
39#if ENABLE(SUPER_REGION)
40    // Over-allocate so that we can make sure that we're aligned to the size of Regions.
41    m_reservation = PageReservation::reserve(s_fixedHeapMemoryPoolSize + Region::s_regionSize, OSAllocator::JSGCHeapPages);
42    m_reservationBase = getAlignedBase(m_reservation);
43    addFreshFreeSpace(m_reservationBase, s_fixedHeapMemoryPoolSize);
44#else
45    UNUSED_PARAM(m_reservation);
46    UNUSED_PARAM(m_reservationBase);
47#endif
48}
49
50SuperRegion::~SuperRegion()
51{
52#if ENABLE(SUPER_REGION)
53    m_reservation.deallocate();
54#endif
55}
56
57void* SuperRegion::getAlignedBase(PageReservation& reservation)
58{
59    for (char* current = static_cast<char*>(reservation.base()); current < static_cast<char*>(reservation.base()) + Region::s_regionSize; current += pageSize()) {
60        if (!(reinterpret_cast<size_t>(current) & ~Region::s_regionMask))
61            return current;
62    }
63    ASSERT_NOT_REACHED();
64    return 0;
65}
66
67void* SuperRegion::allocateNewSpace(size_t&)
68{
69    return 0;
70}
71
72void SuperRegion::notifyNeedPage(void* page)
73{
74    m_reservation.commit(page, Region::s_regionSize);
75}
76
77void SuperRegion::notifyPageIsFree(void* page)
78{
79    m_reservation.decommit(page, Region::s_regionSize);
80}
81
82} // namespace JSC
83