1/*
2 * Copyright (C) 2012, 2015 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 CopyVisitor_h
27#define CopyVisitor_h
28
29#include "CopiedSpace.h"
30#include <wtf/Noncopyable.h>
31
32namespace JSC {
33
34class Heap;
35
36class CopyVisitor {
37 WTF_MAKE_NONCOPYABLE(CopyVisitor);
38public:
39 CopyVisitor(Heap&);
40 ~CopyVisitor();
41
42 void copyFromShared();
43
44 // Low-level API for copying, appropriate for cases where the object's heap references
45 // are discontiguous or if the object occurs frequently enough that you need to focus on
46 // performance. Use this with care as it is easy to shoot yourself in the foot.
47 bool checkIfShouldCopy(void*);
48 void* allocateNewSpace(size_t);
49 void didCopy(void*, size_t);
50
51private:
52 void* allocateNewSpaceSlow(size_t);
53 void visitItem(CopyWorklistItem);
54
55 Heap& m_heap;
56 CopiedAllocator m_copiedAllocator;
57};
58
59} // namespace JSC
60
61#endif
62