org.eclipse.debug.examples.core/src/org/eclipse/debug/examples/core/pda/model/PDADebugTarget.java - gerrit/platform/eclipse.platform.debug - Git at Google

 /*******************************************************************************
  * Copyright (c) 2005, 2007 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  *     IBM Corporation - initial API and implementation
  *     Bjorn Freeman-Benson - initial API and implementation
  *******************************************************************************/
 package org.eclipse.debug.examples.core.pda.model;

 import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.InputStreamReader;
 import java.io.PrintWriter;
 import java.net.Socket;
 import java.net.UnknownHostException;
 import java.util.Vector;

 import org.eclipse.core.resources.IMarker;
 import org.eclipse.core.resources.IMarkerDelta;
 import org.eclipse.core.resources.IResource;
 import org.eclipse.core.runtime.CoreException;
 import org.eclipse.core.runtime.IPath;
 import org.eclipse.core.runtime.IProgressMonitor;
 import org.eclipse.core.runtime.IStatus;
 import org.eclipse.core.runtime.Path;
 import org.eclipse.core.runtime.Status;
 import org.eclipse.core.runtime.jobs.Job;
 import org.eclipse.debug.core.DebugException;
 import org.eclipse.debug.core.IBreakpointManager;
 import org.eclipse.debug.core.IBreakpointManagerListener;
 import org.eclipse.debug.core.ILaunch;
 import org.eclipse.debug.core.model.IBreakpoint;
 import org.eclipse.debug.core.model.IDebugTarget;
 import org.eclipse.debug.core.model.IMemoryBlock;
 import org.eclipse.debug.core.model.IProcess;
 import org.eclipse.debug.core.model.IThread;
 import org.eclipse.debug.core.model.IValue;
 import org.eclipse.debug.examples.core.pda.DebugCorePlugin;
 import org.eclipse.debug.examples.core.pda.breakpoints.PDALineBreakpoint;
 import org.eclipse.debug.examples.core.pda.breakpoints.PDARunToLineBreakpoint;


 /**
  * PDA Debug Target
  */
 public class PDADebugTarget extends PDADebugElement implements IDebugTarget, IBreakpointManagerListener, IPDAEventListener {

 	// associated system process (VM)
 	private IProcess fProcess;

 	// containing launch object
 	private ILaunch fLaunch;

 	// sockets to communicate with VM
 	private Socket fRequestSocket;
 	private PrintWriter fRequestWriter;
 	private BufferedReader fRequestReader;
 	private Socket fEventSocket;
 	private BufferedReader fEventReader;

 	// terminated state
 	private boolean fTerminated = false;

 	// threads
 	private IThread[] fThreads;
 	private PDAThread fThread;

 	// event dispatch job
 	private EventDispatchJob fEventDispatch;
 	// event listeners
 	private Vector fEventListeners = new Vector();

 	/**
 	 * Listens to events from the PDA VM and fires corresponding
 	 * debug events.
 	 */
 	class EventDispatchJob extends Job {

 		public EventDispatchJob() {
 			super("PDA Event Dispatch");
 			setSystem(true);
 		}

 		/* (non-Javadoc)
 		 * @see org.eclipse.core.runtime.jobs.Job#run(org.eclipse.core.runtime.IProgressMonitor)
 		 */
 		protected IStatus run(IProgressMonitor monitor) {
 			String event = "";
 			while (!isTerminated() && event != null) {
 				try {
 					event = fEventReader.readLine();
 					if (event != null) {
 						Object[] listeners = fEventListeners.toArray();
 						for (int i = 0; i < listeners.length; i++) {
 							((IPDAEventListener)listeners[i]).handleEvent(event);
 						}
 					}
 				} catch (IOException e) {
 					terminated();
 				}
 			}
 			return Status.OK_STATUS;
 		}

 	}

 	/**
 	 * Registers the given event listener. The listener will be notified of
 	 * events in the program being interpretted. Has no effect if the listener
 	 * is already registered.
 	 *
 	 * @param listener event listener
 	 */
 	public void addEventListener(IPDAEventListener listener) {
 		if (!fEventListeners.contains(listener)) {
 			fEventListeners.add(listener);
 		}
 	}

 	/**
 	 * Deregisters the given event listener. Has no effect if the listener is
 	 * not currently registered.
 	 *
 	 * @param listener event listener
 	 */
 	public void removeEventListener(IPDAEventListener listener) {
 		fEventListeners.remove(listener);
 	}

 	/**
 	 * Constructs a new debug target in the given launch for the
 	 * associated PDA VM process.
 	 *
 	 * @param launch containing launch
 	 * @param process PDA VM
 	 * @param requestPort port to send requests to the VM
 	 * @param eventPort port to read events from
 	 * @exception CoreException if unable to connect to host
 	 */
 	public PDADebugTarget(ILaunch launch, IProcess process, int requestPort, int eventPort) throws CoreException {
 		super(null);
 		fLaunch = launch;
 		fProcess = process;
 		addEventListener(this);
 		try {
 			// give interpreter a chance to start
 			try {
 				Thread.sleep(1000);
 			} catch (InterruptedException e) {
 			}
 			fRequestSocket = new Socket("localhost", requestPort);
 			fRequestWriter = new PrintWriter(fRequestSocket.getOutputStream());
 			fRequestReader = new BufferedReader(new InputStreamReader(fRequestSocket.getInputStream()));
 			// give interpreter a chance to open next socket
 			try {
 				Thread.sleep(1000);
 			} catch (InterruptedException e) {
 			}
 			fEventSocket = new Socket("localhost", eventPort);
 			fEventReader = new BufferedReader(new InputStreamReader(fEventSocket.getInputStream()));
 		} catch (UnknownHostException e) {
 			requestFailed("Unable to connect to PDA VM", e);
 		} catch (IOException e) {
 			requestFailed("Unable to connect to PDA VM", e);
 		}
 		fThread = new PDAThread(this);
 		fThreads = new IThread[] {fThread};
 		fEventDispatch = new EventDispatchJob();
 		fEventDispatch.schedule();
 		IBreakpointManager breakpointManager = getBreakpointManager();
         breakpointManager.addBreakpointListener(this);
 		breakpointManager.addBreakpointManagerListener(this);
 		// initialize error hanlding to suspend on 'unimplemented instructions'
 		// and 'no such label' errors
 		sendRequest("eventstop unimpinstr 1");
 		sendRequest("eventstop nosuchlabel 1");
 	}

     /* (non-Javadoc)
 	 * @see org.eclipse.debug.core.model.IDebugTarget#getProcess()
 	 */
 	public IProcess getProcess() {
 		return fProcess;
 	}
 	/* (non-Javadoc)
 	 * @see org.eclipse.debug.core.model.IDebugTarget#getThreads()
 	 */
 	public IThread[] getThreads() throws DebugException {
 		return fThreads;
 	}
 	/* (non-Javadoc)
 	 * @see org.eclipse.debug.core.model.IDebugTarget#hasThreads()
 	 */
 	public boolean hasThreads() throws DebugException {
 		return true;
 	}
 	/* (non-Javadoc)
 	 * @see org.eclipse.debug.core.model.IDebugTarget#getName()
 	 */
 	public String getName() throws DebugException {
 		return "PDA";
 	}
 	/* (non-Javadoc)
 	 * @see org.eclipse.debug.core.model.IDebugTarget#supportsBreakpoint(org.eclipse.debug.core.model.IBreakpoint)
 	 */
 	public boolean supportsBreakpoint(IBreakpoint breakpoint) {
 		if (!isTerminated() && breakpoint.getModelIdentifier().equals(getModelIdentifier())) {
 			try {
 				String program = getLaunch().getLaunchConfiguration().getAttribute(DebugCorePlugin.ATTR_PDA_PROGRAM, (String)null);
 				if (program != null) {
 					IResource resource = null;
 					if (breakpoint instanceof PDARunToLineBreakpoint) {
 						PDARunToLineBreakpoint rtl = (PDARunToLineBreakpoint) breakpoint;
 						resource = rtl.getSourceFile();
 					} else {
 						IMarker marker = breakpoint.getMarker();
 						if (marker != null) {
 							resource = marker.getResource();
 						}
 					}
 					if (resource != null) {
 						IPath p = new Path(program);
 						return resource.getFullPath().equals(p);
 					}
 				}
 			} catch (CoreException e) {
 			}
 		}
 		return false;
 	}
 	/* (non-Javadoc)
 	 * @see org.eclipse.debug.core.model.IDebugElement#getDebugTarget()
 	 */
 	public IDebugTarget getDebugTarget() {
 		return this;
 	}
 	/* (non-Javadoc)
 	 * @see org.eclipse.debug.core.model.IDebugElement#getLaunch()
 	 */
 	public ILaunch getLaunch() {
 		return fLaunch;
 	}
 	/* (non-Javadoc)
 	 * @see org.eclipse.debug.core.model.ITerminate#canTerminate()
 	 */
 	public boolean canTerminate() {
 		return getProcess().canTerminate();
 	}
 	/* (non-Javadoc)
 	 * @see org.eclipse.debug.core.model.ITerminate#isTerminated()
 	 */
 	public boolean isTerminated() {
 		return fTerminated || getProcess().isTerminated();
 	}
 	/* (non-Javadoc)
 	 * @see org.eclipse.debug.core.model.ITerminate#terminate()
 	 */
 	public void terminate() throws DebugException {
 		getThread().terminate();
 	}
 	/* (non-Javadoc)
 	 * @see org.eclipse.debug.core.model.ISuspendResume#canResume()
 	 */
 	public boolean canResume() {
 		return !isTerminated() && isSuspended();
 	}
 	/* (non-Javadoc)
 	 * @see org.eclipse.debug.core.model.ISuspendResume#canSuspend()
 	 */
 	public boolean canSuspend() {
 		return !isTerminated() && !isSuspended();
 	}
 	/* (non-Javadoc)
 	 * @see org.eclipse.debug.core.model.ISuspendResume#isSuspended()
 	 */
 	public boolean isSuspended() {
 		return !isTerminated() && getThread().isSuspended();
 	}
 	/* (non-Javadoc)
 	 * @see org.eclipse.debug.core.model.ISuspendResume#resume()
 	 */
 	public void resume() throws DebugException {
 		getThread().resume();
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.debug.core.model.ISuspendResume#suspend()
 	 */
 	public void suspend() throws DebugException {
 		getThread().suspend();
 	}
 	/* (non-Javadoc)
 	 * @see org.eclipse.debug.core.IBreakpointListener#breakpointAdded(org.eclipse.debug.core.model.IBreakpoint)
 	 */
 	public void breakpointAdded(IBreakpoint breakpoint) {
 		if (supportsBreakpoint(breakpoint)) {
 			try {
 				if ((breakpoint.isEnabled() && getBreakpointManager().isEnabled()) || !breakpoint.isRegistered()) {
 					PDALineBreakpoint pdaBreakpoint = (PDALineBreakpoint)breakpoint;
 				    pdaBreakpoint.install(this);
 				}
 			} catch (CoreException e) {
 			}
 		}
 	}
 	/* (non-Javadoc)
 	 * @see org.eclipse.debug.core.IBreakpointListener#breakpointRemoved(org.eclipse.debug.core.model.IBreakpoint, org.eclipse.core.resources.IMarkerDelta)
 	 */
 	public void breakpointRemoved(IBreakpoint breakpoint, IMarkerDelta delta) {
 		if (supportsBreakpoint(breakpoint)) {
 			try {
 			    PDALineBreakpoint pdaBreakpoint = (PDALineBreakpoint)breakpoint;
 				pdaBreakpoint.remove(this);
 			} catch (CoreException e) {
 			}
 		}
 	}
 	/* (non-Javadoc)
 	 * @see org.eclipse.debug.core.IBreakpointListener#breakpointChanged(org.eclipse.debug.core.model.IBreakpoint, org.eclipse.core.resources.IMarkerDelta)
 	 */
 	public void breakpointChanged(IBreakpoint breakpoint, IMarkerDelta delta) {
 		if (supportsBreakpoint(breakpoint)) {
 			try {
 				if (breakpoint.isEnabled() && getBreakpointManager().isEnabled()) {
 					breakpointAdded(breakpoint);
 				} else {
 					breakpointRemoved(breakpoint, null);
 				}
 			} catch (CoreException e) {
 			}
 		}
 	}
 	/* (non-Javadoc)
 	 * @see org.eclipse.debug.core.model.IDisconnect#canDisconnect()
 	 */
 	public boolean canDisconnect() {
 		return false;
 	}
 	/* (non-Javadoc)
 	 * @see org.eclipse.debug.core.model.IDisconnect#disconnect()
 	 */
 	public void disconnect() throws DebugException {
 	}
 	/* (non-Javadoc)
 	 * @see org.eclipse.debug.core.model.IDisconnect#isDisconnected()
 	 */
 	public boolean isDisconnected() {
 		return false;
 	}
 	/* (non-Javadoc)
 	 * @see org.eclipse.debug.core.model.IMemoryBlockRetrieval#supportsStorageRetrieval()
 	 */
 	public boolean supportsStorageRetrieval() {
 		return false;
 	}
 	/* (non-Javadoc)
 	 * @see org.eclipse.debug.core.model.IMemoryBlockRetrieval#getMemoryBlock(long, long)
 	 */
 	public IMemoryBlock getMemoryBlock(long startAddress, long length) throws DebugException {
 		return null;
 	}

 	/**
 	 * Notification we have connected to the VM and it has started.
 	 * Resume the VM.
 	 */
 	private void started() {
 		fireCreationEvent();
 		installDeferredBreakpoints();
 		try {
 			resume();
 		} catch (DebugException e) {
 		}
 	}

 	/**
 	 * Install breakpoints that are already registered with the breakpoint
 	 * manager.
 	 */
 	private void installDeferredBreakpoints() {
 		IBreakpoint[] breakpoints = getBreakpointManager().getBreakpoints(getModelIdentifier());
 		for (int i = 0; i < breakpoints.length; i++) {
 			breakpointAdded(breakpoints[i]);
 		}
 	}

 	/**
 	 * Called when this debug target terminates.
 	 */
 	private synchronized void terminated() {
 		fTerminated = true;
 		fThread = null;
 		fThreads = new IThread[0];
 		IBreakpointManager breakpointManager = getBreakpointManager();
         breakpointManager.removeBreakpointListener(this);
 		breakpointManager.removeBreakpointManagerListener(this);
 		fireTerminateEvent();
 		removeEventListener(this);
 	}

 	/**
 	 * Returns the values on the data stack (top down)
 	 *
 	 * @return the values on the data stack (top down)
 	 */
 	public IValue[] getDataStack() throws DebugException {
 		String dataStack = sendRequest("data");
 		if (dataStack != null && dataStack.length() > 0) {
 			String[] values = dataStack.split("\\|");
 			IValue[] theValues = new IValue[values.length];
 			for (int i = 0; i < values.length; i++) {
 				String value = values[values.length - i - 1];
 				theValues[i] = new PDAStackValue(this, value, i);
 			}
 			return theValues;
 		}
 		return new IValue[0];
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.debug.examples.core.pda.model.PDADebugElement#sendRequest(java.lang.String)
 	 */
 	public String sendRequest(String request) throws DebugException {
 		synchronized (fRequestSocket) {
 			fRequestWriter.println(request);
 			fRequestWriter.flush();
 			try {
 				// wait for reply
 				return fRequestReader.readLine();
 			} catch (IOException e) {
 				requestFailed("Request failed: " + request, e);
 			}
 		}
 		return null;
 	}

 	/**
 	 * When the breakpoint manager disables, remove all registered breakpoints
 	 * requests from the VM. When it enables, reinstall them.
 	 */
 	public void breakpointManagerEnablementChanged(boolean enabled) {
 		IBreakpoint[] breakpoints = getBreakpointManager().getBreakpoints(getModelIdentifier());
 		for (int i = 0; i < breakpoints.length; i++) {
 			if (enabled) {
 				breakpointAdded(breakpoints[i]);
 			} else {
 				breakpointRemoved(breakpoints[i], null);
 			}
         }
 	}

 	/**
 	 * Returns whether popping the data stack is currently permitted
 	 *
 	 * @return whether popping the data stack is currently permitted
 	 */
 	public boolean canPop() {
 	    try {
             return !isTerminated() && isSuspended() && getDataStack().length > 0;
         } catch (DebugException e) {
         }
         return false;
 	}

 	/**
 	 * Pops and returns the top of the data stack
 	 *
 	 * @return the top value on the stack
 	 * @throws DebugException if the stack is empty or the request fails
 	 */
 	public IValue pop() throws DebugException {
 	    IValue[] dataStack = getDataStack();
 	    if (dataStack.length > 0) {
 	        sendRequest("popdata");
 	        return dataStack[0];
 	    }
 	    requestFailed("Empty stack", null);
 	    return null;
 	}

 	/**
 	 * Returns whether pushing a value is currently supported.
 	 *
 	 * @return whether pushing a value is currently supported
 	 */
 	public boolean canPush() {
 	    return !isTerminated() && isSuspended();
 	}

 	/**
 	 * Pushes a value onto the stack.
 	 *
 	 * @param value value to push
 	 * @throws DebugException on failure
 	 */
 	public void push(String value) throws DebugException {
 	    sendRequest("pushdata " + value);
 	}

 	/* (non-Javadoc)
 	 * @see org.eclipse.debug.examples.core.pda.model.IPDAEventListener#handleEvent(java.lang.String)
 	 */
 	public void handleEvent(String event) {
 		if (event.equals("started")) {
 			started();
 		} else if (event.equals("terminated")) {
 			terminated();
 		}
 	}

 	/**
 	 * Returns this debug target's single thread, or <code>null</code>
 	 * if terminated.
 	 *
 	 * @return this debug target's single thread, or <code>null</code>
 	 * if terminated
 	 */
 	public synchronized PDAThread getThread() {
 		return fThread;
 	}
 }
	/*******************************************************************************
	* Copyright (c) 2005, 2007 IBM Corporation and others.
	* All rights reserved. This program and the accompanying materials
	* are made available under the terms of the Eclipse Public License v1.0
	* which accompanies this distribution, and is available at
	* http://www.eclipse.org/legal/epl-v10.html
	*
	* Contributors:
	* IBM Corporation - initial API and implementation
	* Bjorn Freeman-Benson - initial API and implementation
	*******************************************************************************/
	package org.eclipse.debug.examples.core.pda.model;

	import java.io.BufferedReader;
	import java.io.IOException;
	import java.io.InputStreamReader;
	import java.io.PrintWriter;
	import java.net.Socket;
	import java.net.UnknownHostException;
	import java.util.Vector;

	import org.eclipse.core.resources.IMarker;
	import org.eclipse.core.resources.IMarkerDelta;
	import org.eclipse.core.resources.IResource;
	import org.eclipse.core.runtime.CoreException;
	import org.eclipse.core.runtime.IPath;
	import org.eclipse.core.runtime.IProgressMonitor;
	import org.eclipse.core.runtime.IStatus;
	import org.eclipse.core.runtime.Path;
	import org.eclipse.core.runtime.Status;
	import org.eclipse.core.runtime.jobs.Job;
	import org.eclipse.debug.core.DebugException;
	import org.eclipse.debug.core.IBreakpointManager;
	import org.eclipse.debug.core.IBreakpointManagerListener;
	import org.eclipse.debug.core.ILaunch;
	import org.eclipse.debug.core.model.IBreakpoint;
	import org.eclipse.debug.core.model.IDebugTarget;
	import org.eclipse.debug.core.model.IMemoryBlock;
	import org.eclipse.debug.core.model.IProcess;
	import org.eclipse.debug.core.model.IThread;
	import org.eclipse.debug.core.model.IValue;
	import org.eclipse.debug.examples.core.pda.DebugCorePlugin;
	import org.eclipse.debug.examples.core.pda.breakpoints.PDALineBreakpoint;
	import org.eclipse.debug.examples.core.pda.breakpoints.PDARunToLineBreakpoint;


	/**
	* PDA Debug Target
	*/
	public class PDADebugTarget extends PDADebugElement implements IDebugTarget, IBreakpointManagerListener, IPDAEventListener {

	// associated system process (VM)
	private IProcess fProcess;

	// containing launch object
	private ILaunch fLaunch;

	// sockets to communicate with VM
	private Socket fRequestSocket;
	private PrintWriter fRequestWriter;
	private BufferedReader fRequestReader;
	private Socket fEventSocket;
	private BufferedReader fEventReader;

	// terminated state
	private boolean fTerminated = false;

	// threads
	private IThread[] fThreads;
	private PDAThread fThread;

	// event dispatch job
	private EventDispatchJob fEventDispatch;
	// event listeners
	private Vector fEventListeners = new Vector();

	/**
	* Listens to events from the PDA VM and fires corresponding
	* debug events.
	*/
	class EventDispatchJob extends Job {

	public EventDispatchJob() {
	super("PDA Event Dispatch");
	setSystem(true);
	}

	/* (non-Javadoc)
	* @see org.eclipse.core.runtime.jobs.Job#run(org.eclipse.core.runtime.IProgressMonitor)
	*/
	protected IStatus run(IProgressMonitor monitor) {
	String event = "";
	while (!isTerminated() && event != null) {
	try {
	event = fEventReader.readLine();
	if (event != null) {
	Object[] listeners = fEventListeners.toArray();
	for (int i = 0; i < listeners.length; i++) {
	((IPDAEventListener)listeners[i]).handleEvent(event);
	}
	}
	} catch (IOException e) {
	terminated();
	}
	}
	return Status.OK_STATUS;
	}

	}

	/**
	* Registers the given event listener. The listener will be notified of
	* events in the program being interpretted. Has no effect if the listener
	* is already registered.
	*
	* @param listener event listener
	*/
	public void addEventListener(IPDAEventListener listener) {
	if (!fEventListeners.contains(listener)) {
	fEventListeners.add(listener);
	}
	}

	/**
	* Deregisters the given event listener. Has no effect if the listener is
	* not currently registered.
	*
	* @param listener event listener
	*/
	public void removeEventListener(IPDAEventListener listener) {
	fEventListeners.remove(listener);
	}

	/**
	* Constructs a new debug target in the given launch for the
	* associated PDA VM process.
	*
	* @param launch containing launch
	* @param process PDA VM
	* @param requestPort port to send requests to the VM
	* @param eventPort port to read events from
	* @exception CoreException if unable to connect to host
	*/
	public PDADebugTarget(ILaunch launch, IProcess process, int requestPort, int eventPort) throws CoreException {
	super(null);
	fLaunch = launch;
	fProcess = process;
	addEventListener(this);
	try {
	// give interpreter a chance to start
	try {
	Thread.sleep(1000);
	} catch (InterruptedException e) {
	}
	fRequestSocket = new Socket("localhost", requestPort);
	fRequestWriter = new PrintWriter(fRequestSocket.getOutputStream());
	fRequestReader = new BufferedReader(new InputStreamReader(fRequestSocket.getInputStream()));
	// give interpreter a chance to open next socket
	try {
	Thread.sleep(1000);
	} catch (InterruptedException e) {
	}
	fEventSocket = new Socket("localhost", eventPort);
	fEventReader = new BufferedReader(new InputStreamReader(fEventSocket.getInputStream()));
	} catch (UnknownHostException e) {
	requestFailed("Unable to connect to PDA VM", e);
	} catch (IOException e) {
	requestFailed("Unable to connect to PDA VM", e);
	}
	fThread = new PDAThread(this);
	fThreads = new IThread[] {fThread};
	fEventDispatch = new EventDispatchJob();
	fEventDispatch.schedule();
	IBreakpointManager breakpointManager = getBreakpointManager();
	breakpointManager.addBreakpointListener(this);
	breakpointManager.addBreakpointManagerListener(this);
	// initialize error hanlding to suspend on 'unimplemented instructions'
	// and 'no such label' errors
	sendRequest("eventstop unimpinstr 1");
	sendRequest("eventstop nosuchlabel 1");
	}

	/* (non-Javadoc)
	* @see org.eclipse.debug.core.model.IDebugTarget#getProcess()
	*/
	public IProcess getProcess() {
	return fProcess;
	}
	/* (non-Javadoc)
	* @see org.eclipse.debug.core.model.IDebugTarget#getThreads()
	*/
	public IThread[] getThreads() throws DebugException {
	return fThreads;
	}
	/* (non-Javadoc)
	* @see org.eclipse.debug.core.model.IDebugTarget#hasThreads()
	*/
	public boolean hasThreads() throws DebugException {
	return true;
	}
	/* (non-Javadoc)
	* @see org.eclipse.debug.core.model.IDebugTarget#getName()
	*/
	public String getName() throws DebugException {
	return "PDA";
	}
	/* (non-Javadoc)
	* @see org.eclipse.debug.core.model.IDebugTarget#supportsBreakpoint(org.eclipse.debug.core.model.IBreakpoint)
	*/
	public boolean supportsBreakpoint(IBreakpoint breakpoint) {
	if (!isTerminated() && breakpoint.getModelIdentifier().equals(getModelIdentifier())) {
	try {
	String program = getLaunch().getLaunchConfiguration().getAttribute(DebugCorePlugin.ATTR_PDA_PROGRAM, (String)null);
	if (program != null) {
	IResource resource = null;
	if (breakpoint instanceof PDARunToLineBreakpoint) {
	PDARunToLineBreakpoint rtl = (PDARunToLineBreakpoint) breakpoint;
	resource = rtl.getSourceFile();
	} else {
	IMarker marker = breakpoint.getMarker();
	if (marker != null) {
	resource = marker.getResource();
	}
	}
	if (resource != null) {
	IPath p = new Path(program);
	return resource.getFullPath().equals(p);
	}
	}
	} catch (CoreException e) {
	}
	}
	return false;
	}
	/* (non-Javadoc)
	* @see org.eclipse.debug.core.model.IDebugElement#getDebugTarget()
	*/
	public IDebugTarget getDebugTarget() {
	return this;
	}
	/* (non-Javadoc)
	* @see org.eclipse.debug.core.model.IDebugElement#getLaunch()
	*/
	public ILaunch getLaunch() {
	return fLaunch;
	}
	/* (non-Javadoc)
	* @see org.eclipse.debug.core.model.ITerminate#canTerminate()
	*/
	public boolean canTerminate() {
	return getProcess().canTerminate();
	}
	/* (non-Javadoc)
	* @see org.eclipse.debug.core.model.ITerminate#isTerminated()
	*/
	public boolean isTerminated() {
	return fTerminated \|\| getProcess().isTerminated();
	}
	/* (non-Javadoc)
	* @see org.eclipse.debug.core.model.ITerminate#terminate()
	*/
	public void terminate() throws DebugException {
	getThread().terminate();
	}
	/* (non-Javadoc)
	* @see org.eclipse.debug.core.model.ISuspendResume#canResume()
	*/
	public boolean canResume() {
	return !isTerminated() && isSuspended();
	}
	/* (non-Javadoc)
	* @see org.eclipse.debug.core.model.ISuspendResume#canSuspend()
	*/
	public boolean canSuspend() {
	return !isTerminated() && !isSuspended();
	}
	/* (non-Javadoc)
	* @see org.eclipse.debug.core.model.ISuspendResume#isSuspended()
	*/
	public boolean isSuspended() {
	return !isTerminated() && getThread().isSuspended();
	}
	/* (non-Javadoc)
	* @see org.eclipse.debug.core.model.ISuspendResume#resume()
	*/
	public void resume() throws DebugException {
	getThread().resume();
	}

	/* (non-Javadoc)
	* @see org.eclipse.debug.core.model.ISuspendResume#suspend()
	*/
	public void suspend() throws DebugException {
	getThread().suspend();
	}
	/* (non-Javadoc)
	* @see org.eclipse.debug.core.IBreakpointListener#breakpointAdded(org.eclipse.debug.core.model.IBreakpoint)
	*/
	public void breakpointAdded(IBreakpoint breakpoint) {
	if (supportsBreakpoint(breakpoint)) {
	try {
	if ((breakpoint.isEnabled() && getBreakpointManager().isEnabled()) \|\| !breakpoint.isRegistered()) {
	PDALineBreakpoint pdaBreakpoint = (PDALineBreakpoint)breakpoint;
	pdaBreakpoint.install(this);
	}
	} catch (CoreException e) {
	}
	}
	}
	/* (non-Javadoc)
	* @see org.eclipse.debug.core.IBreakpointListener#breakpointRemoved(org.eclipse.debug.core.model.IBreakpoint, org.eclipse.core.resources.IMarkerDelta)
	*/
	public void breakpointRemoved(IBreakpoint breakpoint, IMarkerDelta delta) {
	if (supportsBreakpoint(breakpoint)) {
	try {
	PDALineBreakpoint pdaBreakpoint = (PDALineBreakpoint)breakpoint;
	pdaBreakpoint.remove(this);
	} catch (CoreException e) {
	}
	}
	}
	/* (non-Javadoc)
	* @see org.eclipse.debug.core.IBreakpointListener#breakpointChanged(org.eclipse.debug.core.model.IBreakpoint, org.eclipse.core.resources.IMarkerDelta)
	*/
	public void breakpointChanged(IBreakpoint breakpoint, IMarkerDelta delta) {
	if (supportsBreakpoint(breakpoint)) {
	try {
	if (breakpoint.isEnabled() && getBreakpointManager().isEnabled()) {
	breakpointAdded(breakpoint);
	} else {
	breakpointRemoved(breakpoint, null);
	}
	} catch (CoreException e) {
	}
	}
	}
	/* (non-Javadoc)
	* @see org.eclipse.debug.core.model.IDisconnect#canDisconnect()
	*/
	public boolean canDisconnect() {
	return false;
	}
	/* (non-Javadoc)
	* @see org.eclipse.debug.core.model.IDisconnect#disconnect()
	*/
	public void disconnect() throws DebugException {
	}
	/* (non-Javadoc)
	* @see org.eclipse.debug.core.model.IDisconnect#isDisconnected()
	*/
	public boolean isDisconnected() {
	return false;
	}
	/* (non-Javadoc)
	* @see org.eclipse.debug.core.model.IMemoryBlockRetrieval#supportsStorageRetrieval()
	*/
	public boolean supportsStorageRetrieval() {
	return false;
	}
	/* (non-Javadoc)
	* @see org.eclipse.debug.core.model.IMemoryBlockRetrieval#getMemoryBlock(long, long)
	*/
	public IMemoryBlock getMemoryBlock(long startAddress, long length) throws DebugException {
	return null;
	}

	/**
	* Notification we have connected to the VM and it has started.
	* Resume the VM.
	*/
	private void started() {
	fireCreationEvent();
	installDeferredBreakpoints();
	try {
	resume();
	} catch (DebugException e) {
	}
	}

	/**
	* Install breakpoints that are already registered with the breakpoint
	* manager.
	*/
	private void installDeferredBreakpoints() {
	IBreakpoint[] breakpoints = getBreakpointManager().getBreakpoints(getModelIdentifier());
	for (int i = 0; i < breakpoints.length; i++) {
	breakpointAdded(breakpoints[i]);
	}
	}

	/**
	* Called when this debug target terminates.
	*/
	private synchronized void terminated() {
	fTerminated = true;
	fThread = null;
	fThreads = new IThread[0];
	IBreakpointManager breakpointManager = getBreakpointManager();
	breakpointManager.removeBreakpointListener(this);
	breakpointManager.removeBreakpointManagerListener(this);
	fireTerminateEvent();
	removeEventListener(this);
	}

	/**
	* Returns the values on the data stack (top down)
	*
	* @return the values on the data stack (top down)
	*/
	public IValue[] getDataStack() throws DebugException {
	String dataStack = sendRequest("data");
	if (dataStack != null && dataStack.length() > 0) {
	String[] values = dataStack.split("\\\|");
	IValue[] theValues = new IValue[values.length];
	for (int i = 0; i < values.length; i++) {
	String value = values[values.length - i - 1];
	theValues[i] = new PDAStackValue(this, value, i);
	}
	return theValues;
	}
	return new IValue[0];
	}

	/* (non-Javadoc)
	* @see org.eclipse.debug.examples.core.pda.model.PDADebugElement#sendRequest(java.lang.String)
	*/
	public String sendRequest(String request) throws DebugException {
	synchronized (fRequestSocket) {
	fRequestWriter.println(request);
	fRequestWriter.flush();
	try {
	// wait for reply
	return fRequestReader.readLine();
	} catch (IOException e) {
	requestFailed("Request failed: " + request, e);
	}
	}
	return null;
	}

	/**
	* When the breakpoint manager disables, remove all registered breakpoints
	* requests from the VM. When it enables, reinstall them.
	*/
	public void breakpointManagerEnablementChanged(boolean enabled) {
	IBreakpoint[] breakpoints = getBreakpointManager().getBreakpoints(getModelIdentifier());
	for (int i = 0; i < breakpoints.length; i++) {
	if (enabled) {
	breakpointAdded(breakpoints[i]);
	} else {
	breakpointRemoved(breakpoints[i], null);
	}
	}
	}

	/**
	* Returns whether popping the data stack is currently permitted
	*
	* @return whether popping the data stack is currently permitted
	*/
	public boolean canPop() {
	try {
	return !isTerminated() && isSuspended() && getDataStack().length > 0;
	} catch (DebugException e) {
	}
	return false;
	}

	/**
	* Pops and returns the top of the data stack
	*
	* @return the top value on the stack
	* @throws DebugException if the stack is empty or the request fails
	*/
	public IValue pop() throws DebugException {
	IValue[] dataStack = getDataStack();
	if (dataStack.length > 0) {
	sendRequest("popdata");
	return dataStack[0];
	}
	requestFailed("Empty stack", null);
	return null;
	}

	/**
	* Returns whether pushing a value is currently supported.
	*
	* @return whether pushing a value is currently supported
	*/
	public boolean canPush() {
	return !isTerminated() && isSuspended();
	}

	/**
	* Pushes a value onto the stack.
	*
	* @param value value to push
	* @throws DebugException on failure
	*/
	public void push(String value) throws DebugException {
	sendRequest("pushdata " + value);
	}

	/* (non-Javadoc)
	* @see org.eclipse.debug.examples.core.pda.model.IPDAEventListener#handleEvent(java.lang.String)
	*/
	public void handleEvent(String event) {
	if (event.equals("started")) {
	started();
	} else if (event.equals("terminated")) {
	terminated();
	}
	}

	/**
	* Returns this debug target's single thread, or <code>null</code>
	* if terminated.
	*
	* @return this debug target's single thread, or <code>null</code>
	* if terminated
	*/
	public synchronized PDAThread getThread() {
	return fThread;
	}
	}