[Bug general/3913] New: Core exception at: frysk.proc.BitfieldAccessor.getIntField(FryskGui)

[Bug general/3913] New: Core exception at: frysk.proc.BitfieldAccessor.getIntField(FryskGui)

[mcvet at redhat dot com]

Stepping and running through a process with the SourceWindow, and then trying 
to bring up the RegisterWindow results in a core exception:


frysk.proc.BitfieldAccessor.getIntField(FryskGui)
frysk.gui.register.RegisterWindow.stringUsingView(FryskGui)
frysk.gui.register.RegisterWindow.stringUsingView(FryskGui)
frysk.gui.register.RegisterWindow.refreshList(FryskGui)
frysk.gui.register.RegisterWindow.load(FryskGui)
frysk.gui.register.RegisterWindow.finishRegWin(FryskGui)
frysk.gui.register.RegisterWindow$LockObserver.update(FryskGui)
java.util.Observable.notifyObservers(libgcj.so.7rh)
frysk.rt.RunState.updateExecuted(FryskGui)
frysk.proc.Proc$14.add(FryskGui)
frysk.proc.LinuxPtraceTaskState$Attached.handleAddObservation(FryskGui)
frysk.proc.Task.handleAddObservation(FryskGui)
frysk.proc.TaskObservation.handleAdd(FryskGui)
frysk.proc.LinuxPtraceProcState$Attaching.allAttached(FryskGui)
frysk.proc.LinuxPtraceProcState$Attaching$ToMainTask.handleTaskAttachCompleted(FryskGui)
frysk.proc.Proc$4.execute(FryskGui)
frysk.event.EventLoop.runEventLoop(FryskGui)
frysk.event.EventLoop.run(FryskGui)
frysk.gui.Gui$4.run(FryskGui)
java.lang.Thread.run(libgcj.so.7rh)

-- 
           Summary: Core exception at:
                    frysk.proc.BitfieldAccessor.getIntField(FryskGui)
           Product: frysk
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: general
        AssignedTo: frysk-bugzilla at sourceware dot org
        ReportedBy: mcvet at redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=3913

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[Bug general/3913] Core exception at: frysk.proc.BitfieldAccessor.getIntField(FryskGui)

[mcvet at redhat dot com]

------- Additional Comments From mcvet at redhat dot com  2007-01-24 16:30 -------
x86_64

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[Bug general/3913] Core exception at: frysk.proc.BitfieldAccessor.getIntField(FryskGui)

[mcvet at redhat dot com]

------- Additional Comments From mcvet at redhat dot com  2007-01-24 17:59 -------
Thanks to Mark's recent patch, we now know which Exception it was:

java.lang.NullPointerException
   at frysk.proc.BitfieldAccessor.getIntField(FryskGui)
   at frysk.gui.register.RegisterWindow.stringUsingView(FryskGui)
   at frysk.gui.register.RegisterWindow.stringUsingView(FryskGui)
   at frysk.gui.register.RegisterWindow.refreshList(FryskGui)
   at frysk.gui.register.RegisterWindow.load(FryskGui)
   at frysk.gui.register.RegisterWindow.finishRegWin(FryskGui)
   at frysk.gui.register.RegisterWindow$LockObserver.update(FryskGui)
   at java.util.Observable.notifyObservers(libgcj.so.7rh)
   at frysk.rt.RunState.updateExecuted(FryskGui)
   at frysk.proc.Task.notifyInstruction(FryskGui)
   at frysk.proc.LinuxPtraceTaskState$Running.handleTrappedEvent(FryskGui)
   at frysk.proc.Task.processTrappedEvent(FryskGui)
   at frysk.proc.LinuxPtraceHost$PollWaitOnSigChld$5.stopped(FryskGui)
   at frysk.sys.Wait.waitAllNoHang(FryskGui)
   at frysk.proc.LinuxPtraceHost$PollWaitOnSigChld.execute(FryskGui)
   at frysk.event.EventLoop.runEventLoop(FryskGui)
   at frysk.event.EventLoop.run(FryskGui)
   at frysk.gui.Gui$4.run(FryskGui)
   at java.lang.Thread.run(libgcj.so.7rh)


-- 


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[Bug general/3913] Core exception at: frysk.proc.BitfieldAccessor.getIntField(FryskGui)

[mcvet at redhat dot com]

------- Additional Comments From mcvet at redhat dot com  2007-01-24 18:23 -------
Seems to be reproduceable: If #3913 can be reproduced, than an extra step leads 
to this error.

-- 


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[Bug general/3913] Core exception at: frysk.proc.BitfieldAccessor.getIntField(FryskGui)

[mark at klomp dot org]

------- Additional Comments From mark at klomp dot org  2007-01-24 19:32 -------
(In reply to comment #2)
> Thanks to Mark's recent patch, we now know which Exception it was:
> 
> java.lang.NullPointerException
>    at frysk.proc.BitfieldAccessor.getIntField(FryskGui)
>    at frysk.gui.register.RegisterWindow.stringUsingView(FryskGui)
>    at frysk.gui.register.RegisterWindow.stringUsingView(FryskGui)
>    at frysk.gui.register.RegisterWindow.refreshList(FryskGui)

That seems to indicate that value is null. Maybe the following debug info helps
find the real problem, or at least verifies that value is indeed null.

diff -u -r1.34 RegisterWindow.java
--- frysk-gui/frysk/gui/register/RegisterWindow.java    23 Jan 2007 16:47:34
-0000      1.34
+++ frysk-gui/frysk/gui/register/RegisterWindow.java    24 Jan 2007 19:30:31 -0000
@@ -484,6 +484,10 @@
        int bitlength = register.getLength() * 8;
        BigInteger value
          = (BigInteger)model.getValue(iter, (DataColumnObject)cols[11]);
+
+       if (value == null)
+         System.err.println("Whoa! value null with: " + register);
+
        RegisterView view = register.getViews()[0];
 
        // Binary little endian


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[Bug general/3913] Core exception at: frysk.proc.BitfieldAccessor.getIntField(FryskGui)

[mark at klomp dot org]

------- Additional Comments From mark at klomp dot org  2007-01-24 19:33 -------
(In reply to comment #3)
> Seems to be reproduceable: If #3913 can be reproduced, than an extra step leads 
> to this error.

That seems a little recursive. If this bug occurs then it is reproduced?
Could you give some more steps?

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