Debugging NPE during CanonicalizerPhase

[Gilles Duboscq]

It would be nice to make FrameAccessNode.getDebugProperties a bit more
robust also.


On Wed, Aug 7, 2013 at 12:58 AM, Andreas Woess <Andreas.Woess at jku.at> wrote:

> Looks like a frame slot field in one of your nodes was null at compile
> time and read as a constant value. I'll have a look at your code tomorrow.
>
> We'll add better checks soon.
>
> - andreas
>
> On 07.08.2013 00:35, Stefan Marr wrote:
> > Hi Thomas:
> >
> > On 06 Aug 2013, at 08:56, Thomas Wuerthinger <
> thomas.wuerthinger at oracle.com> wrote:
> >
> >> Can you upload the IGV graph that is produced by the -G:+DumpOnError
> flag? You should have "./mx.sh igv" running in parallel and then export the
> graph as an XML file. Also, what is your stack trace?
> > Well, I would like to, but the NPE getting into the way…
> >
> > Here the two stack traces, once with and once without igv:
> >
> > http://soft.vub.ac.be/~smarr/downloads/truffle/error-with-igv.txt
> > http://soft.vub.ac.be/~smarr/downloads/truffle/error-without-igv.txt
> >
> > That's the result with the very latest code from today.
> > Invocation looks like this:
> > ./mx.sh --vm server --debug build debug && ./mx.sh --debug --vm server
> vm -G:+DumpOnError -Xbootclasspath/a:../som/build/classes som.vm.Universe
> -cp ../som/Smalltalk ../som/Examples/Benchmarks/Loop.som
> >
> > So far, I was only able to confirm that the null constant object really
> appears only in the CanonicalizerPhase.
> > I added checks on the whole graph for everything that happens before the
> pass.
> >
> > One question Michael had, and that I investigate is whether there was
> anything related to TruffleSOM, and I think, the first null constant that
> was a problem was actually not directly related to my code. But I haven't
> had the chance to investigate further yet.
> >
> > Thanks
> > Stefan
> >
> > PS: TruffleSOM can be build and tested like this:
> >
> >   $ git clone https://github.com/smarr/TruffleSOM.git som
> >   $ cd som
> >   $ ant test
> >
>
>