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#pragma once
27
28#include "BInline.h"
29#include "EligibilityResult.h"
30#include "IsoAllocator.h"
31#include "IsoHeapImplInlines.h"
32#include "IsoPage.h"
33
34namespace bmalloc {
35
36template<typename Config>
37IsoAllocator<Config>::IsoAllocator(IsoHeapImpl<Config>& heap)
38 : m_heap(&heap)
39{
40}
41
42template<typename Config>
43IsoAllocator<Config>::~IsoAllocator()
44{
45}
46
47template<typename Config>
48void* IsoAllocator<Config>::allocate(bool abortOnFailure)
49{
50 static constexpr bool verbose = false;
51 void* result = m_freeList.allocate<Config>(
52 [&] () -> void* {
53 return allocateSlow(abortOnFailure);
54 });
55 if (verbose)
56 fprintf(stderr, "%p: allocated %p of size %u\n", m_heap, result, Config::objectSize);
57 return result;
58}
59
60template<typename Config>
61BNO_INLINE void* IsoAllocator<Config>::allocateSlow(bool abortOnFailure)
62{
63 std::lock_guard<Mutex> locker(m_heap->lock);
64
65 AllocationMode allocationMode = m_heap->updateAllocationMode();
66 if (allocationMode == AllocationMode::Shared) {
67 if (m_currentPage) {
68 m_currentPage->stopAllocating(m_freeList);
69 m_currentPage = nullptr;
70 m_freeList.clear();
71 }
72 return m_heap->allocateFromShared(locker, abortOnFailure);
73 }
74
75 BASSERT(allocationMode == AllocationMode::Fast);
76
77 EligibilityResult<Config> result = m_heap->takeFirstEligible();
78 if (result.kind != EligibilityKind::Success) {
79 RELEASE_BASSERT(result.kind == EligibilityKind::OutOfMemory);
80 RELEASE_BASSERT(!abortOnFailure);
81 return nullptr;
82 }
83
84 if (m_currentPage)
85 m_currentPage->stopAllocating(m_freeList);
86
87 m_currentPage = result.page;
88 m_freeList = m_currentPage->startAllocating();
89
90 return m_freeList.allocate<Config>([] () { BCRASH(); return nullptr; });
91}
92
93template<typename Config>
94void IsoAllocator<Config>::scavenge()
95{
96 if (m_currentPage) {
97 std::lock_guard<Mutex> locker(m_heap->lock);
98 m_currentPage->stopAllocating(m_freeList);
99 m_currentPage = nullptr;
100 m_freeList.clear();
101 }
102}
103
104} // namespace bmalloc
105
106