1/*
2 * Copyright (C) 2018 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 "IsoSubspacePerVM.h"
28
29#include "JSCInlines.h"
30
31namespace JSC {
32
33class IsoSubspacePerVM::AutoremovingIsoSubspace : public IsoSubspace {
34public:
35 AutoremovingIsoSubspace(IsoSubspacePerVM& perVM, CString name, Heap& heap, HeapCellType* heapCellType, size_t size)
36 : IsoSubspace(name, heap, heapCellType, size)
37 , m_perVM(perVM)
38 {
39 }
40
41 ~AutoremovingIsoSubspace()
42 {
43 auto locker = holdLock(m_perVM.m_lock);
44 m_perVM.m_subspacePerVM.remove(space().heap()->vm());
45 }
46
47private:
48 IsoSubspacePerVM& m_perVM;
49};
50
51IsoSubspacePerVM::IsoSubspacePerVM(Function<SubspaceParameters(VM&)> subspaceParameters)
52 : m_subspaceParameters(WTFMove(subspaceParameters))
53{
54}
55
56IsoSubspacePerVM::~IsoSubspacePerVM()
57{
58 UNREACHABLE_FOR_PLATFORM();
59}
60
61IsoSubspace& IsoSubspacePerVM::forVM(VM& vm)
62{
63 auto locker = holdLock(m_lock);
64 auto result = m_subspacePerVM.add(&vm, nullptr);
65 if (result.isNewEntry) {
66 SubspaceParameters params = m_subspaceParameters(vm);
67 result.iterator->value = new AutoremovingIsoSubspace(*this, params.name, vm.heap, params.heapCellType, params.size);
68 }
69 return *result.iterator->value;
70}
71
72} // namespace JSC
73
74