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#ifndef RecursiveAllocationScope_h
27#define RecursiveAllocationScope_h
28
29#include "Heap.h"
30#include "VM.h"
31
32namespace JSC {
33
34class RecursiveAllocationScope {
35public:
36    RecursiveAllocationScope(Heap& heap)
37        : m_heap(heap)
38#ifndef NDEBUG
39        , m_savedObjectClass(heap.vm()->m_initializingObjectClass)
40#endif
41    {
42#ifndef NDEBUG
43        m_heap.vm()->m_initializingObjectClass = nullptr;
44#endif
45        m_heap.m_deferralDepth++; // Make sure that we don't GC.
46    }
47
48    ~RecursiveAllocationScope()
49    {
50        m_heap.m_deferralDepth--; // Decrement deferal manually so we don't GC when we do so since we are already GCing!.
51#ifndef NDEBUG
52        m_heap.vm()->m_initializingObjectClass = m_savedObjectClass;
53#endif
54    }
55
56private:
57    Heap& m_heap;
58#ifndef NDEBUG
59    const ClassInfo* m_savedObjectClass;
60#endif
61};
62
63}
64
65#endif // RecursiveAllocationScope_h
66