1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
|
/*
* Copyright (C) 2011 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef HandleSet_h
#define HandleSet_h
#include "Handle.h"
#include "HandleBlock.h"
#include <wtf/DoublyLinkedList.h>
#include <wtf/HashCountedSet.h>
#include <wtf/SentinelLinkedList.h>
#include <wtf/SinglyLinkedList.h>
namespace JSC {
class HandleSet;
class HeapRootVisitor;
class VM;
class JSValue;
class HandleNode {
public:
HandleNode(WTF::SentinelTag);
HandleNode();
HandleSlot slot();
HandleSet* handleSet();
void setPrev(HandleNode*);
HandleNode* prev();
void setNext(HandleNode*);
HandleNode* next();
private:
JSValue m_value;
HandleNode* m_prev;
HandleNode* m_next;
};
class HandleSet {
friend class HandleBlock;
public:
static HandleSet* heapFor(HandleSlot);
HandleSet(VM*);
~HandleSet();
VM* vm();
HandleSlot allocate();
void deallocate(HandleSlot);
void visitStrongHandles(HeapRootVisitor&);
JS_EXPORT_PRIVATE void writeBarrier(HandleSlot, const JSValue&);
unsigned protectedGlobalObjectCount();
template<typename Functor> void forEachStrongHandle(Functor&, const HashCountedSet<JSCell*>& skipSet);
private:
typedef HandleNode Node;
static HandleSlot toHandle(Node*);
static Node* toNode(HandleSlot);
JS_EXPORT_PRIVATE void grow();
#if ENABLE(GC_VALIDATION) || !ASSERT_DISABLED
bool isLiveNode(Node*);
#endif
VM* m_vm;
DoublyLinkedList<HandleBlock> m_blockList;
SentinelLinkedList<Node> m_strongList;
SentinelLinkedList<Node> m_immediateList;
SinglyLinkedList<Node> m_freeList;
};
inline HandleSet* HandleSet::heapFor(HandleSlot handle)
{
return toNode(handle)->handleSet();
}
inline VM* HandleSet::vm()
{
return m_vm;
}
inline HandleSlot HandleSet::toHandle(HandleSet::Node* node)
{
return reinterpret_cast<HandleSlot>(node);
}
inline HandleSet::Node* HandleSet::toNode(HandleSlot handle)
{
return reinterpret_cast<HandleSet::Node*>(handle);
}
inline HandleSlot HandleSet::allocate()
{
if (m_freeList.isEmpty())
grow();
HandleSet::Node* node = m_freeList.pop();
new (NotNull, node) HandleSet::Node();
m_immediateList.push(node);
return toHandle(node);
}
inline void HandleSet::deallocate(HandleSlot handle)
{
HandleSet::Node* node = toNode(handle);
SentinelLinkedList<HandleSet::Node>::remove(node);
m_freeList.push(node);
}
inline HandleNode::HandleNode()
: m_prev(0)
, m_next(0)
{
}
inline HandleNode::HandleNode(WTF::SentinelTag)
: m_prev(0)
, m_next(0)
{
}
inline HandleSlot HandleNode::slot()
{
return &m_value;
}
inline HandleSet* HandleNode::handleSet()
{
return HandleBlock::blockFor(this)->handleSet();
}
inline void HandleNode::setPrev(HandleNode* prev)
{
m_prev = prev;
}
inline HandleNode* HandleNode::prev()
{
return m_prev;
}
inline void HandleNode::setNext(HandleNode* next)
{
m_next = next;
}
inline HandleNode* HandleNode::next()
{
return m_next;
}
template<typename Functor> void HandleSet::forEachStrongHandle(Functor& functor, const HashCountedSet<JSCell*>& skipSet)
{
HandleSet::Node* end = m_strongList.end();
for (HandleSet::Node* node = m_strongList.begin(); node != end; node = node->next()) {
JSValue value = *node->slot();
if (!value || !value.isCell())
continue;
if (skipSet.contains(value.asCell()))
continue;
functor(value.asCell());
}
}
}
#endif
|
