Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * 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);

     }

   }

 }