1/*
2 * Copyright (C) 2012 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
31namespace JSC {
32
33class GCThreadSharedData;
34class JSCell;
35
36class CopyVisitor {
37public:
38    CopyVisitor(GCThreadSharedData&);
39
40    void copyFromShared();
41
42    void startCopying();
43    void doneCopying();
44
45    // Low-level API for copying, appropriate for cases where the object's heap references
46    // are discontiguous or if the object occurs frequently enough that you need to focus on
47    // performance. Use this with care as it is easy to shoot yourself in the foot.
48    bool checkIfShouldCopy(void*);
49    void* allocateNewSpace(size_t);
50    void didCopy(void*, size_t);
51
52private:
53    void* allocateNewSpaceSlow(size_t);
54    void visitItem(CopyWorklistItem);
55
56    GCThreadSharedData& m_shared;
57    CopiedAllocator m_copiedAllocator;
58};
59
60} // namespace JSC
61
62#endif
63