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Re: GH replacement proposal (includes a bit of Unicode)

From: Marius Vollmer
Subject: Re: GH replacement proposal (includes a bit of Unicode)
Date: Wed, 21 Apr 2004 20:06:34 +0200
User-agent: Gnus/5.1002 (Gnus v5.10.2) Emacs/21.3 (gnu/linux)

address@hidden (Paul Jarc) writes:

>> will cause something like
>>   In procedure subr1 in expression (subr1 #f):
>>   Wrong type argument: #f
>> instead of
>>   In procedure subr2 in expression (subr1 #f):
>>   Wrong type argument in position 1: #f
> Which means, if subr1 calls more than one system functions that could
> fail, I won't know what operation failed or what its arguments were,
> unless I know a lot about subr1. :(

Well, yes.  But you don't get much more information now.  Unless you
know much about subr1, knowing that the first argument to subr2 is
wrong doesn't help much.

> Could Guile provide a portable interface to walk the C stack?

That would be ideal, yes.  We already have something like it for
producing Scheme backtraces: they are done by walking the C stack, but
with help from the C code.

I'm feeling a bit uneasy about this too...

> (And would the innermost part of the C stack still be there after an
> exception?)

Yes, not after the exception but it can be gathered just before
trowing, like we do it now for the Scheme backtrace.

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