/** Evaluates the given script. */
public String eval(String expr) {
String result = "undefined";
if (expr == null) {
return result;
}
ContextData contextData = currentContextData();
if (contextData == null || frameIndex >= contextData.frameCount()) {
return result;
}
StackFrame frame = contextData.getFrame(frameIndex);
if (contextData.eventThreadFlag) {
Context cx = Context.getCurrentContext();
result = do_eval(cx, frame, expr);
} else {
synchronized (monitor) {
if (insideInterruptLoop) {
evalRequest = expr;
evalFrame = frame;
monitor.notify();
do {
try {
monitor.wait();
} catch (InterruptedException exc) {
Thread.currentThread().interrupt();
break;
}
} while (evalRequest != null);
result = evalResult;
}
}
}
return result;
}
/** Called when a script exception has been thrown. */
private void handleExceptionThrown(Context cx, Throwable ex, StackFrame frame) {
if (breakOnExceptions) {
ContextData cd = frame.contextData();
if (cd.lastProcessedException != ex) {
interrupted(cx, frame, ex);
cd.lastProcessedException = ex;
}
}
}
/** Creates a new StackFrame. */
private StackFrame(Context cx, Dim dim, FunctionSource fsource) {
this.dim = dim;
this.contextData = ContextData.get(cx);
this.fsource = fsource;
this.breakpoints = fsource.sourceInfo().breakpoints;
this.lineNumber = fsource.firstLine();
}
/** Called when the stack frame is entered. */
public void onEnter(Context cx, Scriptable scope, Scriptable thisObj, Object[] args) {
contextData.pushFrame(this);
this.scope = scope;
this.thisObj = thisObj;
if (dim.breakOnEnter) {
dim.handleBreakpointHit(this, cx);
}
}
/** Called when the current position has changed. */
public void onLineChange(Context cx, int lineno) {
this.lineNumber = lineno;
if (!breakpoints[lineno] && !dim.breakFlag) {
boolean lineBreak = contextData.breakNextLine;
if (lineBreak && contextData.stopAtFrameDepth >= 0) {
lineBreak = (contextData.frameCount() <= contextData.stopAtFrameDepth);
}
if (!lineBreak) {
return;
}
contextData.stopAtFrameDepth = -1;
contextData.breakNextLine = false;
}
dim.handleBreakpointHit(this, cx);
}
/** Interrupts script execution. */
private void interrupted(Context cx, final StackFrame frame, Throwable scriptException) {
ContextData contextData = frame.contextData();
boolean eventThreadFlag = callback.isGuiEventThread();
contextData.eventThreadFlag = eventThreadFlag;
boolean recursiveEventThreadCall = false;
interruptedCheck:
synchronized (eventThreadMonitor) {
if (eventThreadFlag) {
if (interruptedContextData != null) {
recursiveEventThreadCall = true;
break interruptedCheck;
}
} else {
while (interruptedContextData != null) {
try {
eventThreadMonitor.wait();
} catch (InterruptedException exc) {
return;
}
}
}
interruptedContextData = contextData;
}
if (recursiveEventThreadCall) {
// XXX: For now the following is commented out as on Linux
// too deep recursion of dispatchNextGuiEvent causes GUI lockout.
// Note: it can make GUI unresponsive if long-running script
// will be called on GUI thread while processing another interrupt
if (false) {
// Run event dispatch until gui sets a flag to exit the initial
// call to interrupted.
while (this.returnValue == -1) {
try {
callback.dispatchNextGuiEvent();
} catch (InterruptedException exc) {
}
}
}
return;
}
if (interruptedContextData == null) Kit.codeBug();
try {
do {
int frameCount = contextData.frameCount();
this.frameIndex = frameCount - 1;
final String threadTitle = Thread.currentThread().toString();
final String alertMessage;
if (scriptException == null) {
alertMessage = null;
} else {
alertMessage = scriptException.toString();
}
int returnValue = -1;
if (!eventThreadFlag) {
synchronized (monitor) {
if (insideInterruptLoop) Kit.codeBug();
this.insideInterruptLoop = true;
this.evalRequest = null;
this.returnValue = -1;
callback.enterInterrupt(frame, threadTitle, alertMessage);
try {
for (; ; ) {
try {
monitor.wait();
} catch (InterruptedException exc) {
Thread.currentThread().interrupt();
break;
}
if (evalRequest != null) {
this.evalResult = null;
try {
evalResult = do_eval(cx, evalFrame, evalRequest);
} finally {
evalRequest = null;
evalFrame = null;
monitor.notify();
}
continue;
}
if (this.returnValue != -1) {
returnValue = this.returnValue;
break;
}
}
} finally {
insideInterruptLoop = false;
}
}
} else {
this.returnValue = -1;
callback.enterInterrupt(frame, threadTitle, alertMessage);
while (this.returnValue == -1) {
try {
callback.dispatchNextGuiEvent();
} catch (InterruptedException exc) {
}
}
returnValue = this.returnValue;
}
switch (returnValue) {
case STEP_OVER:
contextData.breakNextLine = true;
contextData.stopAtFrameDepth = contextData.frameCount();
break;
case STEP_INTO:
contextData.breakNextLine = true;
contextData.stopAtFrameDepth = -1;
break;
case STEP_OUT:
if (contextData.frameCount() > 1) {
contextData.breakNextLine = true;
contextData.stopAtFrameDepth = contextData.frameCount() - 1;
}
break;
}
} while (false);
} finally {
synchronized (eventThreadMonitor) {
interruptedContextData = null;
eventThreadMonitor.notifyAll();
}
}
}
/** Called when the stack frame has been left. */
public void onExit(Context cx, boolean byThrow, Object resultOrException) {
if (dim.breakOnReturn && !byThrow) {
dim.handleBreakpointHit(this, cx);
}
contextData.popFrame();
}