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// ExceptionEvent - an exception event for JVMTI
/* Copyright (C) 2007 Free Software Foundation
This file is part of libgcj.
This software is copyrighted work licensed under the terms of the
Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
details. */
package gnu.gcj.jvmti;
import java.util.WeakHashMap;
/**
* Class to create and send JVMTI Exception events
*
* @author Kyle Galloway (kgallowa@redhat.com)
*/
public class ExceptionEvent
{
// Information about where the exception was thrown
private long _throwMeth, _throwLoc;
// Information about where the exception was or can be caught
private long _catchMeth, _catchLoc;
// Thread where the exception occurred
private Thread _thread;
// The exception
private Throwable _ex;
// A hash map of the exceptions we've already seen in a thread's call stack
private static WeakHashMap<Thread, Throwable> _exMap = new WeakHashMap<Thread, Throwable>();
/**
* Constructs a new ExceptionEvent and sends it. If it is not caught
* within the frame where it was thrown (catchMeth and catchLoc are null),
* check_catch will check for a possible catch further up the call stack
* before marking it uncaught.
*
* @param thr the thread where the exception occurred
* @param throwMeth the method of the throw (a jmethodID)
* @param throwLoc the location of the throw (a jlocation)
* @param ex the exception
* @param catchMeth the method of the catch (a jmethodID), null indicates
* that the exception was not caught in the frame where it was thrown
* @param catchLoc the location of the catch (a jlocation), null indicates
* that the exception was not caught in the frame where it was thrown
*/
private ExceptionEvent(Thread thr, long throwMeth, long throwLoc,
Throwable ex, long catchMeth, long catchLoc)
{
this._thread = thr;
this._ex = ex;
this._throwMeth = throwMeth;
this._throwLoc = throwLoc;
this._catchMeth = catchMeth;
this._catchLoc = catchLoc;
}
public static void postExceptionEvent(Thread thr, long throwMeth,
long throwLoc, Throwable ex,
long catchMeth, long catchLoc)
{
// Check to see if there is an entry for this Thread thr in the has map.
// If not, add the thread to the hash map and send an ExceptionEvent.
if (_exMap.containsKey(thr))
{
// Check to see if we are receiving events for the same exception, or a
// new one. If it is not the same exception beign rethrown, send a new
// event.
if (!(_exMap.get(thr) == ex))
{
_exMap.put(thr, ex);
ExceptionEvent event = new ExceptionEvent(thr, throwMeth,
throwLoc, ex, catchMeth,
catchLoc);
event.sendEvent ();
}
}
else
{
_exMap.put(thr, ex);
ExceptionEvent event = new ExceptionEvent(thr, throwMeth,
throwLoc, ex, catchMeth,
catchLoc);
event.sendEvent();
}
}
public native void sendEvent();
public native void checkCatch();
}
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