jcs.org
Serenity Operating System
1/*
2 * Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice, this
9 * list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
22 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#pragma once
28
29#include <AK/Forward.h>
30#include <AK/Noncopyable.h>
31#include <LibJS/Forward.h>
32
33namespace JS {
34
35class Cell {
36 AK_MAKE_NONCOPYABLE(Cell);
37 AK_MAKE_NONMOVABLE(Cell);
38
39public:
40 virtual ~Cell() {}
41
42 bool is_marked() const { return m_mark; }
43 void set_marked(bool b) { m_mark = b; }
44
45 bool is_live() const { return m_live; }
46 void set_live(bool b) { m_live = b; }
47
48 virtual const char* class_name() const = 0;
49
50 class Visitor {
51 public:
52 virtual void visit(Cell*) = 0;
53 void visit(Value);
54 };
55
56 virtual void visit_children(Visitor&) {}
57
58 Heap& heap() const;
59 Interpreter& interpreter();
60
61protected:
62 Cell() {}
63
64private:
65 bool m_mark { false };
66 bool m_live { true };
67};
68
69const LogStream& operator<<(const LogStream&, const Cell*);
70
71}