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Re: Line/column numbers in user supplied exception handlers

From: Dale P. Smith
Subject: Re: Line/column numbers in user supplied exception handlers
Date: Sun, 01 Jul 2001 19:14:02 -0400

"Dale P. Smith" wrote:
> I'm trying to catch exceptions with my own handler and generate error
> messages that include file/line number information.  If you call the
> attached C program with an argument of 0, 1 or 2, you get these
> different outputs:

Well, digging around I found that scm_ithrow() checks for a catch
handler on the scm_dynwinds list.  If it finds none, it calls
scm_handle_by_message(), which eventually prints out the good line and
column number stuff.  It also calls abort() right after that, but only
if the exit() in scm_handle_by_message() doesn't do it's job. :(

If scm_ithrow() *does* find a catch handler, it does a longjmp() to the
handler.  I tried calling handler_message() in my catch handler (it's
what scm_handle_by_message() calls).  Well, that doesn't work either. It
seems that there is some port saving and swapping (probably to handle
nested load's ) going on that basically removes the file context so the
good error printing routines have nothing to work with.  :(

So still no closer.  What can I do?


Dale P. Smith
Treasurer, Cleveland Linux Users Group
Senior Systems Consultant, Altus Technologies Corporation
440-746-9000 x309

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