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提交 0acc55f9 编写于 作者: C coleenp
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上级 93c03aa3 29bc09b0
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test/runtime/7158988/TestPostFieldModification.java
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......@@ -21,229 +21,38 @@
* 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
public class TestPostFieldModification {
Process process = vm.process();
public String value; // watch modification of value
public static void main(String[] args){
// 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();
System.out.println("Start threads");
// this thread modifies the field 'value'
new Thread() {
TestPostFieldModification test = new TestPostFieldModification();
public void run() {
test.value="test";
for(int i = 0; i < 10; i++) {
test.value += new String("_test");
}
}
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);
}.start();
// this thread is used to trigger a gc
Thread d = new Thread() {
public void run() {
while(true) {
try {
Thread.sleep(100);
} catch (InterruptedException e) {
}
System.gc();
}
}
System.out.flush();
} catch(IOException exc) {
System.err.println("Child I/O Transfer - " + exc);
}
};
d.setDaemon(true);
d.start();
}
}
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