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Debugger.java
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1614 lines (1371 loc) · 46.3 KB
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/* -*- mode: java; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
Part of the Processing project - http://processing.org
Copyright (c) 2012-19 The Processing Foundation
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License version 2
as published by the Free Software Foundation.
This program 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 for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation, Inc.
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package processing.mode.java.debug;
import com.sun.jdi.*;
import com.sun.jdi.event.*;
import com.sun.jdi.request.*;
import java.awt.Component;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.io.*;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import javax.swing.JMenu;
import javax.swing.JMenuItem;
import javax.swing.JTree; // needed for javadocs
import javax.swing.tree.DefaultMutableTreeNode;
import processing.app.Language;
import processing.app.Messages;
import processing.app.RunnerListenerEdtAdapter;
import processing.app.Sketch;
import processing.app.SketchCode;
import processing.app.ui.Toolkit;
import processing.mode.java.JavaBuild;
import processing.mode.java.JavaEditor;
import processing.mode.java.runner.Runner;
public class Debugger {
/// editor window, acting as main view
protected JavaEditor editor;
protected JMenu debugMenu;
protected JMenuItem debugItem;
protected boolean enabled;
protected VariableInspector inspector;
/// the runtime, contains debuggee VM
protected Runner runtime;
/// debuggee vm has started, VMStartEvent received, main class loaded
protected boolean started = false;
/// currently paused at breakpoint or step
protected boolean paused = false;
/// thread the last breakpoint or step occured in
protected ThreadReference currentThread;
/// name of the main class that's currently being debugged
protected String mainClassName;
/// the debuggee's main class
protected ReferenceType mainClass;
/// holds all loaded classes in the debuggee VM
protected Set<ReferenceType> classes = new LinkedHashSet<>();
/// listeners for class load events
protected List<ClassLoadListener> classLoadListeners = new ArrayList<>();
/// path to the src folder of the current build
protected String srcPath;
/// list of current breakpoints
protected List<LineBreakpoint> breakpoints = new ArrayList<>();
/// the step request we are currently in, or null if not in a step
protected StepRequest requestedStep;
/// maps line number changes at runtime (orig -> changed)
protected Map<LineID, LineID> runtimeLineChanges = new HashMap<>();
/// tab filenames which already have been tracked for runtime changes
protected Set<String> runtimeTabsTracked = new HashSet<>();
/// VM event listener
protected VMEventListener vmEventListener = this::vmEvent;
public Debugger(JavaEditor editor) {
this.editor = editor;
inspector = new VariableInspector(editor);
}
/**
* Creates the debug menu. Includes ActionListeners for the menu items.
*/
public void populateMenu(JMenu modeMenu) {
debugMenu = modeMenu;
JMenuItem item;
debugItem = Toolkit.newJMenuItem(Language.text("menu.debug.enable"), 'D');
debugItem.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
editor.toggleDebug();
}
});
debugMenu.add(debugItem);
debugMenu.addSeparator();
item = Toolkit.newJMenuItem(Language.text("menu.debug.continue"), KeyEvent.VK_U);
item.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
//editor.handleContinue();
continueDebug();
}
});
debugMenu.add(item);
item.setEnabled(false);
item = Toolkit.newJMenuItemExt("menu.debug.step");
item.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
//editor.handleStep(0);
stepOver();
}
});
debugMenu.add(item);
item.setEnabled(false);
item = Toolkit.newJMenuItemExt("menu.debug.step_into");
item.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
//handleStep(ActionEvent.SHIFT_MASK);
stepInto();
}
});
debugMenu.add(item);
item.setEnabled(false);
item = Toolkit.newJMenuItemExt("menu.debug.step_out");
item.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
//handleStep(ActionEvent.ALT_MASK);
stepOut();
}
});
debugMenu.add(item);
item.setEnabled(false);
debugMenu.addSeparator();
item =
Toolkit.newJMenuItem(Language.text("menu.debug.toggle_breakpoint"), 'B');
item.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
Messages.log("Invoked 'Toggle Breakpoint' menu item");
// TODO wouldn't getCaretLine() do the same thing with less effort?
//toggleBreakpoint(editor.getCurrentLineID().lineIdx());
toggleBreakpoint(editor.getTextArea().getCaretLine());
}
});
debugMenu.add(item);
item.setEnabled(false);
}
public void enableMenuItem(boolean enabled) {
debugItem.setEnabled(enabled);
}
public boolean isEnabled() {
return enabled;
}
public void toggleEnabled() {
enabled = !enabled;
if (enabled) {
debugItem.setText(Language.text("menu.debug.disable"));
} else {
debugItem.setText(Language.text("menu.debug.enable"));
}
inspector.setVisible(enabled);
for (Component item : debugMenu.getMenuComponents()) {
if (item instanceof JMenuItem && item != debugItem) {
item.setEnabled(enabled);
}
}
}
/*
public void handleStep(int modifiers) {
if (modifiers == 0) {
Messages.log("Invoked 'Step Over' menu item");
stepOver();
} else if ((modifiers & ActionEvent.SHIFT_MASK) != 0) {
Messages.log("Invoked 'Step Into' menu item");
stepInto();
} else if ((modifiers & ActionEvent.ALT_MASK) != 0) {
Messages.log("Invoked 'Step Out' menu item");
stepOut();
}
}
public void handleContinue() {
Messages.log("Invoked 'Continue' menu item");
continueDebug();
}
*/
public VirtualMachine vm() {
if (runtime != null) {
return runtime.vm();
}
return null;
}
public JavaEditor getEditor() {
return editor;
}
/**
* Retrieve the main class of the debuggee VM.
* @return the main classes {@link ReferenceType}
* or null if the debugger is not started.
*/
public ReferenceType getMainClass() {
if (isStarted()) {
return mainClass;
}
return null;
}
/**
* Get the main and nested {@link ReferenceType}s for the sketch.
* @return a list of main and nested {@link ReferenceType}s,
* empty list if nothing found (e.g. not yet loaded)
*/
public Set<ReferenceType> getClasses() {
return classes;
}
/**
* Add a class load listener. Will be notified when a class is loaded in the
* debuggee VM.
* @param listener the {@link ClassLoadListener}
*/
public void addClassLoadListener(ClassLoadListener listener) {
classLoadListeners.add(listener);
}
/**
* Remove a class load listener. Cease to be notified when classes are
* loaded in the debuggee VM.
* @param listener {@link ClassLoadListener}
*/
public void removeClassLoadListener(ClassLoadListener listener) {
classLoadListeners.remove(listener);
}
public void dispose() {
inspector.dispose();
}
/**
* Start a debugging session. Builds the sketch and launches a VM to run it.
* VM starts suspended. Should produce a VMStartEvent.
*/
public synchronized void startDebug() {
//stopDebug(); // stop any running sessions
if (isStarted()) {
return; // do nothing
}
// we are busy now
editor.statusBusy();
// clear console
editor.clearConsole();
// clear variable inspector (also resets expanded states)
inspector.reset();
// load edits into sketch obj, etc...
editor.prepareRun();
// after prepareRun, since this removes highlights
//editor.activateDebug();
editor.activateRun();
try {
Sketch sketch = editor.getSketch();
JavaBuild build = new JavaBuild(sketch);
log("building sketch: " + sketch.getName());
//LineMapping.addLineNumbers(sketch); // annotate
// mainClassName = build.build(false);
mainClassName = build.build(true);
//LineMapping.removeLineNumbers(sketch); // annotate
log("class: " + mainClassName);
// folder with assembled/preprocessed src
srcPath = build.getSrcFolder().getPath();
log("build src: " + srcPath);
// folder with compiled code (.class files)
log("build bin: " + build.getBinFolder().getPath());
if (mainClassName != null) {
// generate the source line mapping
//lineMap = LineMapping.generateMapping(srcPath + File.separator + mainClassName + ".java");
log("launching debuggee runtime");
runtime = new Runner(build, new RunnerListenerEdtAdapter(editor));
VirtualMachine vm = runtime.debug(null); // non-blocking
if (vm == null) {
loge("error 37: launch failed", null);
}
// start receiving vm events
VMEventReader eventThread = new VMEventReader(vm.eventQueue(), vmEventListener);
eventThread.start();
startTrackingLineChanges();
editor.statusBusy();
}
} catch (Exception e) {
editor.statusError(e);
}
}
/**
* End debugging session. Stops and disconnects VM. Should produce
* VMDisconnectEvent.
*/
public synchronized void stopDebug() {
inspector.lock();
if (runtime != null) {
Messages.log("closing runtime");
for (LineBreakpoint bp : breakpoints) {
bp.detach();
}
runtime.close();
runtime = null;
//build = null;
classes.clear();
// need to clear highlight here because, VMDisconnectedEvent seems to be unreliable. TODO: likely synchronization problem
editor.clearCurrentLine();
}
stopTrackingLineChanges();
started = false;
//editor.deactivateDebug();
editor.deactivateRun();
editor.deactivateContinue();
editor.deactivateStep();
editor.statusEmpty();
}
/** Resume paused debugging session. Resumes VM. */
public synchronized void continueDebug() {
editor.activateContinue();
inspector.lock();
//editor.clearSelection();
//clearHighlight();
editor.clearCurrentLine();
if (!isStarted()) {
startDebug();
} else if (isPaused()) {
runtime.vm().resume();
paused = false;
editor.statusBusy();
}
}
/**
* Step through source code lines.
* @param stepDepth the step depth ({@link StepRequest#STEP_OVER},
* {@link StepRequest#STEP_INTO} or {@link StepRequest#STEP_OUT})
*/
protected void step(int stepDepth) {
if (!isStarted()) {
startDebug();
} else if (isPaused()) {
inspector.lock();
editor.activateStep();
// use global to mark that there is a step request pending
requestedStep = runtime.vm().eventRequestManager().createStepRequest(currentThread, StepRequest.STEP_LINE, stepDepth);
requestedStep.addCountFilter(1); // valid for one step only
requestedStep.enable();
paused = false;
runtime.vm().resume();
editor.statusBusy();
}
}
/** Step over current statement. */
public synchronized void stepOver() {
step(StepRequest.STEP_OVER);
}
/** Step into current statement. */
public synchronized void stepInto() {
step(StepRequest.STEP_INTO);
}
/** Step out of current statement. */
public synchronized void stepOut() {
step(StepRequest.STEP_OUT);
}
// /** Print the current stack trace. */
// public synchronized void printStackTrace() {
// if (isStarted()) {
// printStackTrace(currentThread);
// }
// }
//
//
// /**
// * Print local variables. Outputs type, name and value of each variable.
// */
// public synchronized void printLocals() {
// if (isStarted()) {
// printLocalVariables(currentThread);
// }
// }
//
//
// /**
// * Print fields of current {@code this}-object.
// * Outputs type, name and value of each field.
// */
// public synchronized void printThis() {
// if (isStarted()) {
// printThis(currentThread);
// }
// }
//
//
// /**
// * Print a source code snippet of the current location.
// */
// public synchronized void printSource() {
// if (isStarted()) {
// printSourceLocation(currentThread);
// }
// }
/**
* Set a breakpoint on the current line.
*/
synchronized void setBreakpoint() {
setBreakpoint(editor.getCurrentLineID());
}
/**
* Set a breakpoint on a line in the current tab.
* @param lineIdx the line index (0-based) of the current tab to set the
* breakpoint on
*/
synchronized void setBreakpoint(int lineIdx) {
setBreakpoint(editor.getLineIDInCurrentTab(lineIdx));
}
synchronized public void setBreakpoint(LineID line) {
// do nothing if we are kinda busy
if (isStarted() && !isPaused()) {
return;
}
// do nothing if there already is a breakpoint on this line
if (hasBreakpoint(line)) {
return;
}
breakpoints.add(new LineBreakpoint(line, this));
log("set breakpoint on line " + line);
}
/**
* Remove a breakpoint from the current line (if set).
*/
synchronized void removeBreakpoint() {
removeBreakpoint(editor.getCurrentLineID().lineIdx());
}
/**
* Remove a breakpoint from a line in the current tab.
*
* @param lineIdx the line index (0-based) in the current tab to remove the
* breakpoint from
*/
void removeBreakpoint(int lineIdx) {
// do nothing if we are kinda busy
if (isBusy()) {
return;
}
LineBreakpoint bp = breakpointOnLine(editor.getLineIDInCurrentTab(lineIdx));
if (bp != null) {
bp.remove();
breakpoints.remove(bp);
log("removed breakpoint " + bp);
}
}
/** Remove all breakpoints. */
synchronized void clearBreakpoints() {
// TODO: handle busy-ness correctly
if (isBusy()) {
log("busy");
return;
}
for (LineBreakpoint bp : breakpoints) {
bp.remove();
}
breakpoints.clear();
}
/**
* Clear breakpoints in a specific tab.
* @param tabFilename the tab's file name
*/
synchronized public void clearBreakpoints(String tabFilename) {
// TODO: handle busy-ness correctly
if (isBusy()) {
log("busy");
return;
}
Iterator<LineBreakpoint> i = breakpoints.iterator();
while (i.hasNext()) {
LineBreakpoint bp = i.next();
if (bp.lineID().fileName().equals(tabFilename)) {
bp.remove();
i.remove();
}
}
}
/**
* Get the breakpoint on a certain line, if set.
* @param line the line to get the breakpoint from
* @return the breakpoint, or null if no breakpoint is set on the specified
* line.
*/
LineBreakpoint breakpointOnLine(LineID line) {
for (LineBreakpoint bp : breakpoints) {
if (bp.isOnLine(line)) {
return bp;
}
}
return null;
}
/**
* Toggle a breakpoint on a line in the current tab.
* @param lineIdx the line index (0-based) in the current tab
*/
synchronized public void toggleBreakpoint(int lineIdx) {
LineID line = editor.getLineIDInCurrentTab(lineIdx);
int index = line.lineIdx();
if (hasBreakpoint(line)) {
removeBreakpoint(index);
} else {
// Make sure the line contains actual code before setting the break
// https://github.com/processing/processing/issues/3765
if (editor.getLineText(index).trim().length() != 0) {
setBreakpoint(index);
}
}
}
/**
* Check if there's a breakpoint on a particular line.
* @param line the line id
* @return true if a breakpoint is set on the given line, otherwise false
*/
protected boolean hasBreakpoint(LineID line) {
LineBreakpoint bp = breakpointOnLine(line);
return bp != null;
}
// /** Print a list of currently set breakpoints. */
// public synchronized void listBreakpoints() {
// if (breakpoints.isEmpty()) {
// System.out.println("no breakpoints");
// } else {
// System.out.println("line breakpoints:");
// for (LineBreakpoint bp : breakpoints) {
// System.out.println(bp);
// }
// }
// }
/**
* Retrieve a list of breakpoint in a particular tab.
* @param tabFilename the tab's file name
* @return the list of breakpoints in the given tab
*/
synchronized public List<LineBreakpoint> getBreakpoints(String tabFilename) {
List<LineBreakpoint> list = new ArrayList<>();
for (LineBreakpoint bp : breakpoints) {
if (bp.lineID().fileName().equals(tabFilename)) {
list.add(bp);
}
}
return list;
}
/**
* Callback for VM events. Will be called from another thread.
* ({@link VMEventReader})
* @param es Incoming set of events from VM
*/
public synchronized void vmEvent(EventSet es) {
VirtualMachine vm = vm();
if (vm != null && vm != es.virtualMachine()) {
// This is no longer VM we are interested in,
// we already cleaned up and run different VM now.
return;
}
for (Event e : es) {
log("*** VM Event: " + e);
if (e instanceof VMStartEvent) {
vmStartEvent();
} else if (e instanceof ClassPrepareEvent) {
vmClassPrepareEvent((ClassPrepareEvent) e);
} else if (e instanceof BreakpointEvent) {
vmBreakPointEvent((BreakpointEvent) e);
} else if (e instanceof StepEvent) {
vmStepEvent((StepEvent) e);
} else if (e instanceof VMDisconnectEvent) {
stopDebug();
} else if (e instanceof VMDeathEvent) {
started = false;
editor.statusEmpty();
}
}
}
private void createClassPrepareRequest(String name) {
ClassPrepareRequest classPrepareRequest = runtime.vm().eventRequestManager().createClassPrepareRequest();
classPrepareRequest.addClassFilter(name);
classPrepareRequest.enable();
}
private void vmStartEvent() {
// break on main class load
log("requesting event on main class load: " + mainClassName);
createClassPrepareRequest(mainClassName);
createClassPrepareRequest(mainClassName + "$*");
// break on loading custom classes
for (SketchCode tab : editor.getSketch().getCode()) {
if (tab.isExtension("java")) {
log("requesting event on class load: " + tab.getPrettyName());
String name = tab.getPrettyName();
createClassPrepareRequest(name);
createClassPrepareRequest(name + "$*");
}
}
runtime.vm().resume();
}
private void vmClassPrepareEvent(ClassPrepareEvent ce) {
ReferenceType rt = ce.referenceType();
currentThread = ce.thread();
paused = true; // for now we're paused
if (rt.name().equals(mainClassName)) {
//printType(rt);
mainClass = rt;
classes.add(rt);
log("main class load: " + rt.name());
started = true; // now that main class is loaded, we're started
} else {
classes.add(rt); // save loaded classes
log("class load: {0}" + rt.name());
}
// notify listeners
for (ClassLoadListener listener : classLoadListeners) {
if (listener != null) {
listener.classLoaded(rt);
}
}
paused = false; // resuming now
runtime.vm().resume();
}
private void vmBreakPointEvent(BreakpointEvent be) {
currentThread = be.thread(); // save this thread
updateVariableInspector(currentThread); // this is already on the EDT
final LineID newCurrentLine = locationToLineID(be.location());
java.awt.EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
editor.setCurrentLine(newCurrentLine);
editor.deactivateStep();
editor.deactivateContinue();
}
});
// hit a breakpoint during a step, need to cancel the step.
if (requestedStep != null) {
runtime.vm().eventRequestManager().deleteEventRequest(requestedStep);
requestedStep = null;
}
// fix canvas update issue
// TODO: is this a good solution?
resumeOtherThreads(currentThread);
paused = true;
editor.statusHalted();
}
private void vmStepEvent(StepEvent se) {
currentThread = se.thread();
//printSourceLocation(currentThread);
updateVariableInspector(currentThread); // this is already on the EDT
final LineID newCurrentLine = locationToLineID(se.location());
javax.swing.SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
editor.setCurrentLine(newCurrentLine);
editor.deactivateStep();
editor.deactivateContinue();
}
});
// delete the steprequest that triggered this step so new ones can be placed (only one per thread)
EventRequestManager mgr = runtime.vm().eventRequestManager();
mgr.deleteEventRequest(se.request());
requestedStep = null; // mark that there is no step request pending
paused = true;
editor.statusHalted();
// disallow stepping into invisible lines
if (!locationIsVisible(se.location())) {
// TODO: this leads to stepping, should it run on the EDT?
javax.swing.SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
stepOutIntoViewOrContinue();
}
});
}
}
/**
* Check whether a location corresponds to a code line in the editor.
* @param l the location
* @return true if the location corresponds to a line in the editor
*/
protected boolean locationIsVisible(Location l) {
return locationToLineID(l) != null;
}
/**
* Step out if this results in a visible location, otherwise continue.
*/
protected void stepOutIntoViewOrContinue() {
try {
List<StackFrame> frames = currentThread.frames();
if (frames.size() > 1) {
if (locationIsVisible(frames.get(1).location())) {
//System.out.println("stepping out to: " + locationToString(frames.get(1).location()));
stepOut();
return;
}
}
continueDebug();
} catch (IncompatibleThreadStateException ex) {
logitse(ex);
}
}
/**
* Check whether a debugging session is running. i.e. the debugger is
* connected to a debuggee VM, VMStartEvent has been received and main
* class is loaded.
* @return true if the debugger is started.
*/
public synchronized boolean isStarted() {
return started && runtime != null && runtime.vm() != null;
}
/**
* Check whether the debugger is paused. i.e. it is currently suspended
* at a breakpoint or step.
*
* @return true if the debugger is paused, false otherwise or if not started
* ({@link #isStarted()})
*/
public synchronized boolean isPaused() {
return isStarted() && paused && currentThread != null && currentThread.isSuspended();
}
/**
* Check whether the debugger is currently busy. i.e. running (not
* suspended).
* @return true if the debugger is currently running and not suspended.
*/
public synchronized boolean isBusy() {
return isStarted() && !isPaused();
}
/**
* Print call stack trace of a thread. Only works on suspended threads.
* @param t suspended thread to print stack trace of
*/
protected void printStackTrace(ThreadReference t) {
if (!t.isSuspended()) {
return;
}
try {
System.out.println("stack trace for thread " + t.name() + ":");
int i = 0;
for (StackFrame f : t.frames()) {
// Location l = f.location();
System.out.println(i++ + ": " + f.toString());
}
} catch (IncompatibleThreadStateException ex) {
logitse(ex);
}
}
/**
* Resume all other threads except the one given as parameter. Useful
* e.g. to just keep the thread suspended a breakpoint occurred in.
* @param t the thread not to resume
*/
protected void resumeOtherThreads(ThreadReference t) {
if (!isStarted()) {
return;
}
for (ThreadReference other : vm().allThreads()) {
if (!other.equals(t) && other.isSuspended()) {
other.resume();
}
}
}
/**
* Print info about all current threads. Includes name, status,
* isSuspended, isAtBreakpoint.
*/
public synchronized void printThreads() {
if (!isPaused()) {
return;
}
System.out.println("threads:");
for (ThreadReference t : vm().allThreads()) {
printThread(t);
}
}
/**
* Print info about a thread. Includes name, status, isSuspended,
* isAtBreakpoint.
* @param t the thread to print info about
*/
protected void printThread(ThreadReference t) {
System.out.println(t.name());
System.out.println(" is suspended: " + t.isSuspended());
System.out.println(" is at breakpoint: " + t.isAtBreakpoint());
System.out.println(" status: " + threadStatusToString(t.status()));
}
/**
* Convert a status code returned by {@link ThreadReference#status() }
* to a human readable form.
* @param status {@link ThreadReference#THREAD_STATUS_MONITOR},
* {@link ThreadReference#THREAD_STATUS_NOT_STARTED},
* {@link ThreadReference#THREAD_STATUS_RUNNING},
* {@link ThreadReference#THREAD_STATUS_SLEEPING},
* {@link ThreadReference#THREAD_STATUS_UNKNOWN},
* {@link ThreadReference#THREAD_STATUS_WAIT} or
* {@link ThreadReference#THREAD_STATUS_ZOMBIE}
* @return String containing readable status code.
*/
protected String threadStatusToString(int status) {
switch (status) {
case ThreadReference.THREAD_STATUS_MONITOR:
return "THREAD_STATUS_MONITOR";
case ThreadReference.THREAD_STATUS_NOT_STARTED:
return "THREAD_STATUS_NOT_STARTED";
case ThreadReference.THREAD_STATUS_RUNNING:
return "THREAD_STATUS_RUNNING";
case ThreadReference.THREAD_STATUS_SLEEPING:
return "THREAD_STATUS_SLEEPING";
case ThreadReference.THREAD_STATUS_UNKNOWN:
return "THREAD_STATUS_UNKNOWN";
case ThreadReference.THREAD_STATUS_WAIT:
return "THREAD_STATUS_WAIT";
case ThreadReference.THREAD_STATUS_ZOMBIE:
return "THREAD_STATUS_ZOMBIE";
default:
return "";
}
}
/**
* Print local variables on a suspended thread. Takes the topmost stack
* frame and lists all local variables and their values.
*
* @param t suspended thread
*/
protected void printLocalVariables(ThreadReference t) {
if (!t.isSuspended()) {
return;
}
try {
if (t.frameCount() == 0) {
System.out.println("call stack empty");