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 "MarkedBlock.h"
29
30namespace JSC {
31
32class HeapCellType {
33 WTF_MAKE_NONCOPYABLE(HeapCellType);
34 WTF_MAKE_FAST_ALLOCATED;
35public:
36 JS_EXPORT_PRIVATE HeapCellType(CellAttributes);
37 JS_EXPORT_PRIVATE virtual ~HeapCellType();
38
39 const CellAttributes& attributes() const { return m_attributes; }
40
41 // The purpose of overriding this is to specialize the sweep for your destructors. This won't
42 // be called for no-destructor blocks. This must call MarkedBlock::finishSweepKnowingSubspace.
43 virtual void finishSweep(MarkedBlock::Handle&, FreeList*);
44
45 // These get called for large objects.
46 virtual void destroy(VM&, JSCell*);
47
48private:
49 CellAttributes m_attributes;
50};
51
52} // namespace JSC
53
54