[armedbear-devel] New classwriter no longer preserves Lisp source line numbers

Erik Huelsmann ehuels at gmail.com
Mon Nov 22 20:57:48 UTC 2010

Hi Mark,

On Fri, Nov 19, 2010 at 9:55 AM, Mark Evenson <evenson at panix.com> wrote:
> I just noticed that I no longer see Lisp source line numbers in our
> backtraces.  I'm assuming this is a property of the new classwriter.
> For debugging, this seems like a serious regression as we already
> had a paucity of debug information (no way to inspect the frames,
> no stepped, etc.)  Having the line number of the form associated
> with the stack frame at least gave a bit of a clue as to where to
> look for the source of a condition.
> Is my presumption if the lossage stemming from the new classwriter
> correct?


>  Would it be easy to restore?

Yes. As a matter of fact, I just did. We did add the LineNumberTable
attribute into the class file, but we stuck it on the method itself,
instead of on the Code attribute of the method (where Java expects

Fixed and backported.



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