1/*
2 * Copyright (C) 2009, 2011 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#ifndef HeapRootVisitor_h
27#define HeapRootVisitor_h
28
29#include "SlotVisitor.h"
30#include "SlotVisitorInlines.h"
31
32namespace JSC {
33
34 // Privileged class for marking JSValues directly. It is only safe to use
35 // this class to mark direct heap roots that are marked during every GC pass.
36 // All other references should be wrapped in WriteBarriers.
37 class HeapRootVisitor {
38 private:
39 friend class Heap;
40 HeapRootVisitor(SlotVisitor&);
41
42 public:
43 void visit(JSValue*);
44 void visit(JSValue*, size_t);
45 void visit(JSString**);
46 void visit(JSCell**);
47
48 SlotVisitor& visitor();
49
50 private:
51 SlotVisitor& m_visitor;
52 };
53
54 inline HeapRootVisitor::HeapRootVisitor(SlotVisitor& visitor)
55 : m_visitor(visitor)
56 {
57 }
58
59 inline void HeapRootVisitor::visit(JSValue* slot)
60 {
61 m_visitor.appendUnbarrieredValue(slot);
62 }
63
64 inline void HeapRootVisitor::visit(JSValue* slot, size_t count)
65 {
66 for (size_t i = 0; i < count; ++i)
67 m_visitor.appendUnbarrieredValue(&slot[i]);
68 }
69
70 inline void HeapRootVisitor::visit(JSString** slot)
71 {
72 m_visitor.appendUnbarrieredPointer(slot);
73 }
74
75 inline void HeapRootVisitor::visit(JSCell** slot)
76 {
77 m_visitor.appendUnbarrieredPointer(slot);
78 }
79
80 inline SlotVisitor& HeapRootVisitor::visitor()
81 {
82 return m_visitor;
83 }
84
85} // namespace JSC
86
87#endif // HeapRootVisitor_h
88