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
|
/*
* Copyright 2004-2007 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*
*/
package sun.jvm.hotspot.utilities.soql;
import java.util.*;
import sun.jvm.hotspot.debugger.*;
import sun.jvm.hotspot.oops.*;
import sun.jvm.hotspot.runtime.*;
/**
* Wraps a JavaThread instance in the target VM.
*/
public class JSJavaThread extends JSJavaInstance {
public JSJavaThread(Instance threadOop, JSJavaFactory fac) {
super(threadOop, fac);
// JavaThread retrieved from java.lang.Thread instance may be null.
// This is the case for threads not-started and for zombies. Wherever
// appropriate, check for null instead of resulting in NullPointerException.
this.jthread = OopUtilities.threadOopGetJavaThread(threadOop);
}
public JSJavaThread(JavaThread jt, JSJavaFactory fac) {
super((Instance) jt.getThreadObj(), fac);
this.jthread = jt;
}
public String toString() {
String name = getName();
StringBuffer buf = new StringBuffer();
buf.append("Thread (address=");
buf.append(getOop().getHandle());
buf.append(", name=");
if (name != null) {
buf.append(name);
} else {
buf.append("<unnamed>");
}
buf.append(')');
return buf.toString();
}
protected Object getFieldValue(String name) {
if (name.equals("name")) {
return getName();
} else if (name.equals("frames")) {
return getFrames();
} else if (name.equals("monitors")) {
return getOwnedMonitors();
} else {
return super.getFieldValue(name);
}
}
protected String[] getFieldNames() {
String[] flds = super.getFieldNames();
String[] res = new String[flds.length + 2];
System.arraycopy(flds, 0, res, 0, flds.length);
res[flds.length] = "frames";
res[flds.length + 1] = "monitors";
return res;
}
protected boolean hasField(String name) {
if (name.equals("frames") || name.equals("monitors")) {
return true;
} else {
return super.hasField(name);
}
}
//-- Internals only below this point
private String getName() {
return OopUtilities.threadOopGetName(getOop());
}
private synchronized JSList getFrames() {
if (framesCache == null) {
final List list = new ArrayList(0);
if (jthread != null) {
JavaVFrame jvf = jthread.getLastJavaVFrameDbg();
while (jvf != null) {
list.add(jvf);
jvf = jvf.javaSender();
}
}
framesCache = factory.newJSList(list);
}
return framesCache;
}
private synchronized JSList getOwnedMonitors() {
if (monitorsCache == null) {
final List ownedMonitors = new ArrayList(0);
if (jthread != null) {
List lockedObjects = new ArrayList(); // List<OopHandle>
ObjectMonitor waitingMonitor = jthread.getCurrentWaitingMonitor();
OopHandle waitingObj = null;
if (waitingMonitor != null) {
// save object of current wait() call (if any) for later comparison
waitingObj = waitingMonitor.object();
}
ObjectMonitor pendingMonitor = jthread.getCurrentPendingMonitor();
OopHandle pendingObj = null;
if (pendingMonitor != null) {
// save object of current enter() call (if any) for later comparison
pendingObj = pendingMonitor.object();
}
JavaVFrame frame = jthread.getLastJavaVFrameDbg();
while (frame != null) {
List frameMonitors = frame.getMonitors(); // List<MonitorInfo>
for (Iterator miItr = frameMonitors.iterator(); miItr.hasNext(); ) {
MonitorInfo mi = (MonitorInfo) miItr.next();
if (mi.eliminated() && frame.isCompiledFrame()) {
continue; // skip eliminated monitor
}
OopHandle obj = mi.owner();
if (obj == null) {
// this monitor doesn't have an owning object so skip it
continue;
}
if (obj.equals(waitingObj)) {
// the thread is waiting on this monitor so it isn't really owned
continue;
}
if (obj.equals(pendingObj)) {
// the thread is pending on this monitor so it isn't really owned
continue;
}
boolean found = false;
for (Iterator loItr = lockedObjects.iterator(); loItr.hasNext(); ) {
// check for recursive locks
if (obj.equals(loItr.next())) {
found = true;
break;
}
}
if (found) {
// already have this object so don't include it
continue;
}
// add the owning object to our list
lockedObjects.add(obj);
}
frame = (JavaVFrame) frame.javaSender();
}
// now convert List<OopHandle> to List<Oop>
ObjectHeap heap = VM.getVM().getObjectHeap();
for (Iterator loItr = lockedObjects.iterator(); loItr.hasNext(); ) {
ownedMonitors.add(heap.newOop((OopHandle)loItr.next()));
}
}
monitorsCache = factory.newJSList(ownedMonitors);
}
return monitorsCache;
}
private JavaThread jthread;
private JSList framesCache;
private JSList monitorsCache;
}
|
