1/*
2 * Copyright (C) 2013-2017 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 "CollectionScope.h"
29#include <wtf/HashSet.h>
30#include <wtf/Lock.h>
31#include <wtf/Noncopyable.h>
32#include <wtf/PrintStream.h>
33
34namespace JSC {
35
36class CodeBlock;
37class Heap;
38class JSCell;
39class VM;
40
41// CodeBlockSet tracks all CodeBlocks. Every CodeBlock starts out with one
42// reference coming in from GC. The GC is responsible for freeing CodeBlocks
43// once they hasOneRef() and nobody is running code from that CodeBlock.
44
45class CodeBlockSet {
46 WTF_MAKE_FAST_ALLOCATED;
47 WTF_MAKE_NONCOPYABLE(CodeBlockSet);
48public:
49 CodeBlockSet();
50 ~CodeBlockSet();
51
52 void mark(const AbstractLocker&, CodeBlock* candidateCodeBlock);
53
54 void clearCurrentlyExecuting();
55
56 bool contains(const AbstractLocker&, void* candidateCodeBlock);
57 Lock& getLock() { return m_lock; }
58
59 // Visits each CodeBlock in the heap until the visitor function returns true
60 // to indicate that it is done iterating, or until every CodeBlock has been
61 // visited.
62 template<typename Functor> void iterate(const Functor&);
63 template<typename Functor> void iterate(const AbstractLocker&, const Functor&);
64
65 template<typename Functor> void iterateViaSubspaces(VM&, const Functor&);
66
67 template<typename Functor> void iterateCurrentlyExecuting(const Functor&);
68
69 void dump(PrintStream&) const;
70
71 void add(CodeBlock*);
72 void remove(CodeBlock*);
73
74private:
75 HashSet<CodeBlock*> m_codeBlocks;
76 HashSet<CodeBlock*> m_currentlyExecuting;
77 Lock m_lock;
78};
79
80} // namespace JSC
81