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
|
/*
* Copyright (C) 2017 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. ``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
* 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.
*/
#pragma once
#include <wtf/AutomaticThread.h>
#include <wtf/Box.h>
#include <wtf/Expected.h>
#include <wtf/HashSet.h>
#include <wtf/Lock.h>
#include <wtf/Locker.h>
#include <wtf/RefPtr.h>
#include <wtf/StackBounds.h>
namespace JSC {
class ExecState;
class VM;
class VMTraps {
typedef uint8_t BitField;
public:
enum class Error {
None,
LockUnavailable,
NotJITCode
};
enum EventType {
// Sorted in servicing priority order from highest to lowest.
NeedDebuggerBreak,
NeedTermination,
NeedWatchdogCheck,
NumberOfEventTypes, // This entry must be last in this list.
Invalid
};
class Mask {
public:
enum AllEventTypes { AllEventTypesTag };
Mask(AllEventTypes)
: m_mask(std::numeric_limits<BitField>::max())
{ }
static Mask allEventTypes() { return Mask(AllEventTypesTag); }
template<typename... Arguments>
Mask(Arguments... args)
: m_mask(0)
{
init(args...);
}
BitField bits() const { return m_mask; }
private:
template<typename... Arguments>
void init(EventType eventType, Arguments... args)
{
ASSERT(eventType < NumberOfEventTypes);
m_mask |= (1 << eventType);
init(args...);
}
void init() { }
BitField m_mask;
};
~VMTraps();
VMTraps();
void willDestroyVM();
bool needTrapHandling() { return m_needTrapHandling; }
bool needTrapHandling(Mask mask) { return m_needTrapHandling & mask.bits(); }
void* needTrapHandlingAddress() { return &m_needTrapHandling; }
void notifyGrabAllLocks()
{
if (needTrapHandling())
invalidateCodeBlocksOnStack();
}
JS_EXPORT_PRIVATE void fireTrap(EventType);
void handleTraps(ExecState*, VMTraps::Mask);
void tryInstallTrapBreakpoints(struct SignalContext&, StackBounds);
private:
VM& vm() const;
bool hasTrapForEvent(Locker<Lock>&, EventType eventType, Mask mask)
{
ASSERT(eventType < NumberOfEventTypes);
return (m_trapsBitField & mask.bits() & (1 << eventType));
}
void setTrapForEvent(Locker<Lock>&, EventType eventType)
{
ASSERT(eventType < NumberOfEventTypes);
m_trapsBitField |= (1 << eventType);
}
void clearTrapForEvent(Locker<Lock>&, EventType eventType)
{
ASSERT(eventType < NumberOfEventTypes);
m_trapsBitField &= ~(1 << eventType);
}
EventType takeTopPriorityTrap(Mask);
#if ENABLE(SIGNAL_BASED_VM_TRAPS)
class SignalSender;
friend class SignalSender;
void invalidateCodeBlocksOnStack();
void invalidateCodeBlocksOnStack(ExecState* topCallFrame);
void invalidateCodeBlocksOnStack(Locker<Lock>& codeBlockSetLocker, ExecState* topCallFrame);
void addSignalSender(SignalSender*);
void removeSignalSender(SignalSender*);
#else
void invalidateCodeBlocksOnStack() { }
void invalidateCodeBlocksOnStack(ExecState*) { }
#endif
Box<Lock> m_lock;
RefPtr<AutomaticThreadCondition> m_trapSet;
union {
BitField m_needTrapHandling { 0 };
BitField m_trapsBitField;
};
bool m_needToInvalidatedCodeBlocks { false };
bool m_isShuttingDown { false };
#if ENABLE(SIGNAL_BASED_VM_TRAPS)
RefPtr<SignalSender> m_signalSender;
#endif
friend class LLIntOffsetsExtractor;
friend class SignalSender;
};
} // namespace JSC
|
