[kaffe] More Debugging woes

[Dalibor Topic]

--- Fabio Fracassi <fracassi@cs.uni-bonn.de> wrote:
> Somewhere in or during calling an
> NullPointerException gets thrown, but the 
> stacktrace only shows the frames up to HashMap.
> Now my Problem is I can't find out which equals()
> method gets called. It 
> should be java/lang/Object.equals(), but that
> doesen't get called.
> Now my Question is this, How can I find out where
> !exactly! the exception is 
> thrown? How could I step throu the Java code, to
> find out which equals() 
> method does get called?

If in doubt, compile --with-engine=intrp and
--enable-debug, set all debug flags for intrpeter and
exceptions, and run the thing in your debugger. You
should get a reasonable trace of bytecode as it gets
interpreted, and that should help you figuring out
what happens where and why. The downside is that it
can take quite a bit of time.

Or you could disassemble the jit output, of course, if
you know what you're doing ;)

Or you might consider looking at a cool kaffe debugger
http://www.dcs.ed.ac.uk/home/jjc/dl.html

best regards,

dalibor topic

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