--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/test/runtime/7158988/FieldMonitor.java Thu Apr 05 12:17:52 2012 -0400
@@ -0,0 +1,249 @@
+/*
+ * Copyright 2012 SAP AG. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test FieldMonitor.java
+ * @bug 7158988
+ * @summary verify jvm does not crash while debugging
+ * @run shell TestFieldMonitor.sh
+ * @author axel.siebenborn@sap.com
+ */
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.OutputStream;
+import java.io.OutputStreamWriter;
+import java.io.Reader;
+import java.io.Writer;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+
+import com.sun.jdi.Bootstrap;
+import com.sun.jdi.Field;
+import com.sun.jdi.ReferenceType;
+import com.sun.jdi.VirtualMachine;
+import com.sun.jdi.connect.Connector;
+import com.sun.jdi.connect.IllegalConnectorArgumentsException;
+import com.sun.jdi.connect.LaunchingConnector;
+import com.sun.jdi.connect.VMStartException;
+import com.sun.jdi.event.ClassPrepareEvent;
+import com.sun.jdi.event.Event;
+import com.sun.jdi.event.EventQueue;
+import com.sun.jdi.event.EventSet;
+import com.sun.jdi.event.ModificationWatchpointEvent;
+import com.sun.jdi.event.VMDeathEvent;
+import com.sun.jdi.event.VMDisconnectEvent;
+import com.sun.jdi.request.ClassPrepareRequest;
+import com.sun.jdi.request.EventRequest;
+import com.sun.jdi.request.EventRequestManager;
+import com.sun.jdi.request.ModificationWatchpointRequest;
+
+public class FieldMonitor {
+
+ public static final String CLASS_NAME = "TestPostFieldModification";
+ public static final String FIELD_NAME = "value";
+ public static final String ARGUMENTS = "-Xshare:off -XX:+PrintGC";
+
+ public static void main(String[] args)
+ throws IOException, InterruptedException {
+
+ StringBuffer sb = new StringBuffer();
+
+ for (int i=0; i < args.length; i++) {
+ sb.append(' ');
+ sb.append(args[i]);
+ }
+ //VirtualMachine vm = launchTarget(sb.toString());
+ VirtualMachine vm = launchTarget(CLASS_NAME);
+
+ System.out.println("Vm launched");
+ // set watch field on already loaded classes
+ List<ReferenceType> referenceTypes = vm
+ .classesByName(CLASS_NAME);
+ for (ReferenceType refType : referenceTypes) {
+ addFieldWatch(vm, refType);
+ }
+ // watch for loaded classes
+ addClassWatch(vm);
+
+ // process events
+ EventQueue eventQueue = vm.eventQueue();
+ // resume the vm
+
+ Process process = vm.process();
+
+
+ // Copy target's output and error to our output and error.
+ Thread outThread = new StreamRedirectThread("out reader", process.getInputStream());
+ Thread errThread = new StreamRedirectThread("error reader", process.getErrorStream());
+
+ errThread.start();
+ outThread.start();
+
+
+ vm.resume();
+ boolean connected = true;
+ while (connected) {
+ EventSet eventSet = eventQueue.remove();
+ for (Event event : eventSet) {
+ if (event instanceof VMDeathEvent
+ || event instanceof VMDisconnectEvent) {
+ // exit
+ connected = false;
+ } else if (event instanceof ClassPrepareEvent) {
+ // watch field on loaded class
+ System.out.println("ClassPrepareEvent");
+ ClassPrepareEvent classPrepEvent = (ClassPrepareEvent) event;
+ ReferenceType refType = classPrepEvent
+ .referenceType();
+ addFieldWatch(vm, refType);
+ } else if (event instanceof ModificationWatchpointEvent) {
+ System.out.println("sleep for 500 ms");
+ Thread.sleep(500);
+ System.out.println("resume...");
+
+ ModificationWatchpointEvent modEvent = (ModificationWatchpointEvent) event;
+ System.out.println("old="
+ + modEvent.valueCurrent());
+ System.out.println("new=" + modEvent.valueToBe());
+ System.out.println();
+ }
+ }
+ eventSet.resume();
+ }
+ // Shutdown begins when event thread terminates
+ try {
+ errThread.join(); // Make sure output is forwarded
+ outThread.join();
+ } catch (InterruptedException exc) {
+ // we don't interrupt
+ }
+ }
+
+ /**
+ * Find a com.sun.jdi.CommandLineLaunch connector
+ */
+ static LaunchingConnector findLaunchingConnector() {
+ List <Connector> connectors = Bootstrap.virtualMachineManager().allConnectors();
+ Iterator <Connector> iter = connectors.iterator();
+ while (iter.hasNext()) {
+ Connector connector = iter.next();
+ if (connector.name().equals("com.sun.jdi.CommandLineLaunch")) {
+ return (LaunchingConnector)connector;
+ }
+ }
+ throw new Error("No launching connector");
+ }
+ /**
+ * Return the launching connector's arguments.
+ */
+ static Map <String,Connector.Argument> connectorArguments(LaunchingConnector connector, String mainArgs) {
+ Map<String,Connector.Argument> arguments = connector.defaultArguments();
+ for (String key : arguments.keySet()) {
+ System.out.println(key);
+ }
+
+ Connector.Argument mainArg = (Connector.Argument)arguments.get("main");
+ if (mainArg == null) {
+ throw new Error("Bad launching connector");
+ }
+ mainArg.setValue(mainArgs);
+
+ Connector.Argument optionsArg = (Connector.Argument)arguments.get("options");
+ if (optionsArg == null) {
+ throw new Error("Bad launching connector");
+ }
+ optionsArg.setValue(ARGUMENTS);
+ return arguments;
+ }
+
+ static VirtualMachine launchTarget(String mainArgs) {
+ LaunchingConnector connector = findLaunchingConnector();
+ Map arguments = connectorArguments(connector, mainArgs);
+ try {
+ return (VirtualMachine) connector.launch(arguments);
+ } catch (IOException exc) {
+ throw new Error("Unable to launch target VM: " + exc);
+ } catch (IllegalConnectorArgumentsException exc) {
+ throw new Error("Internal error: " + exc);
+ } catch (VMStartException exc) {
+ throw new Error("Target VM failed to initialize: " +
+ exc.getMessage());
+ }
+}
+
+
+ private static void addClassWatch(VirtualMachine vm) {
+ EventRequestManager erm = vm.eventRequestManager();
+ ClassPrepareRequest classPrepareRequest = erm
+ .createClassPrepareRequest();
+ classPrepareRequest.addClassFilter(CLASS_NAME);
+ classPrepareRequest.setEnabled(true);
+ }
+
+
+ private static void addFieldWatch(VirtualMachine vm,
+ ReferenceType refType) {
+ EventRequestManager erm = vm.eventRequestManager();
+ Field field = refType.fieldByName(FIELD_NAME);
+ ModificationWatchpointRequest modificationWatchpointRequest = erm
+ .createModificationWatchpointRequest(field);
+ modificationWatchpointRequest.setSuspendPolicy(EventRequest.SUSPEND_EVENT_THREAD);
+ modificationWatchpointRequest.setEnabled(true);
+ }
+}
+
+class StreamRedirectThread extends Thread {
+
+ private final BufferedReader in;
+
+ private static final int BUFFER_SIZE = 2048;
+
+ /**
+ * Set up for copy.
+ * @param name Name of the thread
+ * @param in Stream to copy from
+ * @param out Stream to copy to
+ */
+ StreamRedirectThread(String name, InputStream in) {
+ super(name);
+ this.in = new BufferedReader(new InputStreamReader(in));
+ }
+
+ /**
+ * Copy.
+ */
+ public void run() {
+ try {
+ String line;
+ while ((line = in.readLine ()) != null) {
+ System.out.println ("testvm: " + line);
+ }
+ System.out.flush();
+ } catch(IOException exc) {
+ System.err.println("Child I/O Transfer - " + exc);
+ }
+ }
+}