1/*
2 * Copyright (C) 2014, 2016 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#if ENABLE(DFG_JIT)
29
30#include <wtf/Vector.h>
31
32namespace JSC {
33
34class SlotVisitor;
35class VM;
36
37namespace DFG {
38
39class Plan;
40class Scannable;
41
42class Safepoint {
43public:
44 class Result {
45 public:
46 Result()
47 : m_didGetCancelled(false)
48 , m_wasChecked(true)
49 {
50 }
51
52 ~Result();
53
54 bool didGetCancelled();
55
56 private:
57 friend class Safepoint;
58
59 bool m_didGetCancelled;
60 bool m_wasChecked;
61 };
62
63 Safepoint(Plan&, Result&);
64 ~Safepoint();
65
66 void add(Scannable*);
67
68 void begin();
69
70 void checkLivenessAndVisitChildren(SlotVisitor&);
71 bool isKnownToBeLiveDuringGC();
72 void cancel();
73
74 VM* vm() const; // May return null if we've been cancelled.
75
76private:
77 VM* m_vm;
78 Plan& m_plan;
79 Vector<Scannable*> m_scannables;
80 bool m_didCallBegin;
81 Result& m_result;
82};
83
84} } // namespace JSC::DFG
85
86#endif // ENABLE(DFG_JIT)
87