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 "IsoHeapImpl.h"
27
28#include "AllIsoHeaps.h"
29#include "PerProcess.h"
30#include <climits>
31
32namespace bmalloc {
33
34IsoHeapImplBase::IsoHeapImplBase()
35{
36}
37
38IsoHeapImplBase::~IsoHeapImplBase()
39{
40}
41
42void IsoHeapImplBase::addToAllIsoHeaps()
43{
44 AllIsoHeaps::get()->add(this);
45}
46
47void IsoHeapImplBase::scavengeNow()
48{
49 Vector<DeferredDecommit> deferredDecommits;
50 scavenge(deferredDecommits);
51 finishScavenging(deferredDecommits);
52}
53
54void IsoHeapImplBase::finishScavenging(Vector<DeferredDecommit>& deferredDecommits)
55{
56 std::sort(
57 deferredDecommits.begin(), deferredDecommits.end(),
58 [&] (const DeferredDecommit& a, const DeferredDecommit& b) -> bool {
59 return a.page < b.page;
60 });
61 unsigned runStartIndex = UINT_MAX;
62 char* run = nullptr;
63 size_t size = 0;
64 auto resetRun = [&] (unsigned endIndex) {
65 if (!run) {
66 RELEASE_BASSERT(!size);
67 RELEASE_BASSERT(runStartIndex == UINT_MAX);
68 return;
69 }
70 RELEASE_BASSERT(size);
71 RELEASE_BASSERT(runStartIndex != UINT_MAX);
72 vmDeallocatePhysicalPages(run, size);
73 for (unsigned i = runStartIndex; i < endIndex; ++i) {
74 const DeferredDecommit& value = deferredDecommits[i];
75 value.directory->didDecommit(value.pageIndex);
76 }
77 run = nullptr;
78 size = 0;
79 runStartIndex = UINT_MAX;
80 };
81 for (unsigned i = 0; i < deferredDecommits.size(); ++i) {
82 const DeferredDecommit& value = deferredDecommits[i];
83 char* page = reinterpret_cast<char*>(value.page);
84 RELEASE_BASSERT(page >= run + size);
85 if (page != run + size) {
86 resetRun(i);
87 runStartIndex = i;
88 run = page;
89 }
90 size += IsoPageBase::pageSize;
91 }
92 resetRun(deferredDecommits.size());
93}
94
95} // namespace bmalloc
96
97