1 /*
2 * Copyright 2012 SAP AG. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 /*
25 * @test FieldMonitor.java
26 * @bug 7158988
27 * @key regression
28 * @summary verify jvm does not crash while debugging
29 * @run compile TestPostFieldModification.java
30 * @run main/othervm FieldMonitor
31 * @author axel.siebenborn@sap.com
32 */
33 import java.io.BufferedReader;
34 import java.io.IOException;
35 import java.io.InputStream;
36 import java.io.InputStreamReader;
37 import java.io.OutputStream;
38 import java.io.OutputStreamWriter;
39 import java.io.Reader;
40 import java.io.Writer;
41 import java.util.Iterator;
42 import java.util.List;
43 import java.util.Map;
44
45 import com.sun.jdi.Bootstrap;
46 import com.sun.jdi.Field;
47 import com.sun.jdi.ReferenceType;
48 import com.sun.jdi.VirtualMachine;
49 import com.sun.jdi.connect.Connector;
50 import com.sun.jdi.connect.IllegalConnectorArgumentsException;
51 import com.sun.jdi.connect.LaunchingConnector;
52 import com.sun.jdi.connect.VMStartException;
53 import com.sun.jdi.event.ClassPrepareEvent;
54 import com.sun.jdi.event.Event;
55 import com.sun.jdi.event.EventQueue;
56 import com.sun.jdi.event.EventSet;
57 import com.sun.jdi.event.ModificationWatchpointEvent;
58 import com.sun.jdi.event.VMDeathEvent;
59 import com.sun.jdi.event.VMDisconnectEvent;
60 import com.sun.jdi.request.ClassPrepareRequest;
61 import com.sun.jdi.request.EventRequest;
62 import com.sun.jdi.request.EventRequestManager;
63 import com.sun.jdi.request.ModificationWatchpointRequest;
64
65 public class FieldMonitor {
66
67 public static final String CLASS_NAME = "TestPostFieldModification";
68 public static final String FIELD_NAME = "value";
69 public static final String ARGUMENTS = "-Xshare:off -XX:+PrintGC";
70
71 public static void main(String[] args)
72 throws IOException, InterruptedException {
73
74 StringBuffer sb = new StringBuffer();
75
76 for (int i=0; i < args.length; i++) {
77 sb.append(' ');
78 sb.append(args[i]);
79 }
80 //VirtualMachine vm = launchTarget(sb.toString());
81 VirtualMachine vm = launchTarget(CLASS_NAME);
82
83 System.out.println("Vm launched");
84 // set watch field on already loaded classes
85 List<ReferenceType> referenceTypes = vm
86 .classesByName(CLASS_NAME);
87 for (ReferenceType refType : referenceTypes) {
88 addFieldWatch(vm, refType);
89 }
90 // watch for loaded classes
91 addClassWatch(vm);
92
93 // process events
94 EventQueue eventQueue = vm.eventQueue();
95 // resume the vm
96
97 Process process = vm.process();
98
99
100 // Copy target's output and error to our output and error.
101 Thread outThread = new StreamRedirectThread("out reader", process.getInputStream());
102 Thread errThread = new StreamRedirectThread("error reader", process.getErrorStream());
103
104 errThread.start();
105 outThread.start();
106
107
108 vm.resume();
109 boolean connected = true;
110 while (connected) {
111 EventSet eventSet = eventQueue.remove();
112 for (Event event : eventSet) {
113 if (event instanceof VMDeathEvent
114 || event instanceof VMDisconnectEvent) {
115 // exit
116 connected = false;
117 } else if (event instanceof ClassPrepareEvent) {
118 // watch field on loaded class
119 System.out.println("ClassPrepareEvent");
120 ClassPrepareEvent classPrepEvent = (ClassPrepareEvent) event;
121 ReferenceType refType = classPrepEvent
122 .referenceType();
123 addFieldWatch(vm, refType);
124 } else if (event instanceof ModificationWatchpointEvent) {
125 System.out.println("sleep for 500 ms");
126 Thread.sleep(500);
127 System.out.println("resume...");
128
129 ModificationWatchpointEvent modEvent = (ModificationWatchpointEvent) event;
130 System.out.println("old="
131 + modEvent.valueCurrent());
132 System.out.println("new=" + modEvent.valueToBe());
133 System.out.println();
134 }
135 }
136 eventSet.resume();
137 }
138 // Shutdown begins when event thread terminates
139 try {
140 errThread.join(); // Make sure output is forwarded
141 outThread.join();
142 } catch (InterruptedException exc) {
143 // we don't interrupt
144 }
145 }
146
147 /**
148 * Find a com.sun.jdi.CommandLineLaunch connector
149 */
150 static LaunchingConnector findLaunchingConnector() {
151 List <Connector> connectors = Bootstrap.virtualMachineManager().allConnectors();
152 Iterator <Connector> iter = connectors.iterator();
153 while (iter.hasNext()) {
154 Connector connector = iter.next();
155 if (connector.name().equals("com.sun.jdi.CommandLineLaunch")) {
156 return (LaunchingConnector)connector;
157 }
158 }
159 throw new Error("No launching connector");
160 }
161 /**
162 * Return the launching connector's arguments.
163 */
164 static Map <String,Connector.Argument> connectorArguments(LaunchingConnector connector, String mainArgs) {
165 Map<String,Connector.Argument> arguments = connector.defaultArguments();
166 for (String key : arguments.keySet()) {
167 System.out.println(key);
168 }
169
170 Connector.Argument mainArg = (Connector.Argument)arguments.get("main");
171 if (mainArg == null) {
172 throw new Error("Bad launching connector");
173 }
174 mainArg.setValue(mainArgs);
175
176 Connector.Argument optionsArg = (Connector.Argument)arguments.get("options");
177 if (optionsArg == null) {
178 throw new Error("Bad launching connector");
179 }
180 optionsArg.setValue(ARGUMENTS);
181 return arguments;
182 }
183
184 static VirtualMachine launchTarget(String mainArgs) {
185 LaunchingConnector connector = findLaunchingConnector();
186 Map arguments = connectorArguments(connector, mainArgs);
187 try {
188 return (VirtualMachine) connector.launch(arguments);
189 } catch (IOException exc) {
190 throw new Error("Unable to launch target VM: " + exc);
191 } catch (IllegalConnectorArgumentsException exc) {
192 throw new Error("Internal error: " + exc);
193 } catch (VMStartException exc) {
194 throw new Error("Target VM failed to initialize: " +
195 exc.getMessage());
196 }
197 }
198
199
200 private static void addClassWatch(VirtualMachine vm) {
201 EventRequestManager erm = vm.eventRequestManager();
202 ClassPrepareRequest classPrepareRequest = erm
203 .createClassPrepareRequest();
204 classPrepareRequest.addClassFilter(CLASS_NAME);
205 classPrepareRequest.setEnabled(true);
206 }
207
208
209 private static void addFieldWatch(VirtualMachine vm,
210 ReferenceType refType) {
211 EventRequestManager erm = vm.eventRequestManager();
212 Field field = refType.fieldByName(FIELD_NAME);
213 ModificationWatchpointRequest modificationWatchpointRequest = erm
214 .createModificationWatchpointRequest(field);
215 modificationWatchpointRequest.setSuspendPolicy(EventRequest.SUSPEND_EVENT_THREAD);
216 modificationWatchpointRequest.setEnabled(true);
217 }
218 }
219
220 class StreamRedirectThread extends Thread {
221
222 private final BufferedReader in;
223
224 private static final int BUFFER_SIZE = 2048;
225
226 /**
227 * Set up for copy.
228 * @param name Name of the thread
229 * @param in Stream to copy from
230 * @param out Stream to copy to
231 */
232 StreamRedirectThread(String name, InputStream in) {
233 super(name);
234 this.in = new BufferedReader(new InputStreamReader(in));
235 }
236
237 /**
238 * Copy.
239 */
240 public void run() {
241 try {
242 String line;
243 while ((line = in.readLine ()) != null) {
244 System.out.println ("testvm: " + line);
245 }
246 System.out.flush();
247 } catch(IOException exc) {
248 System.err.println("Child I/O Transfer - " + exc);
249 }
250 }
251 }