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Re: Help needed debugging segfault with Guile 1.8.7
From: |
Peter TB Brett |
Subject: |
Re: Help needed debugging segfault with Guile 1.8.7 |
Date: |
Tue, 30 Nov 2010 19:56:30 +0000 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/23.2 (gnu/linux) |
Linas Vepstas <address@hidden> writes:
> Basically, if you are going to let users enter arbitrary scheme into
> your app, they *will* enter malformed, broken expressions, and you
> have to deal with these. Among other things, you have to give them
> a clue as to what the error was -- some sort of trace, error reporting.
>
> For me, this was implementing a REPL loop look-alike in my app.
> I can't say "work-alike", I think mine *almost* works-alike, but not sure.
>
> It took me a *long* time to figure out I needed the pre-unwind version
> of things, and even then, it took me a fair amount of effort to figure
> out what to put in there.
>
> Having a section showing how to implement a repl-work-alike loop
> in one's app, with reasonable debugging/stack-printing output,
> would be nice to have. Figuring out how to do this one one's
> own requires a lot of tenacity.
Guile 2.x would be hugely more attractive as an extension language if
there were some higher-level interfaces for application developers. In
gEDA, we have to use a ridiculous amount of C code just to set things up
so that user-provided Scheme expressions can't leave the user staring at
a command prompt wondering where the last hour's work disappeared to
(and even that's not as reliable as we'd like).
Ideally, there should be:
- An easily re-usable/embeddable and well-documented REPL, to aid
developers in implementing a "Scheme Interaction Window" or similar
in their apps.
- An high-level API for passing strings for evaluation, that reports
back the results or error information in a way that's easy to deal
with from C.
In a perfect world, these would be part of the same API. ;-) I believe
that these would actually be applicable to the majority of use-cases of
libguile.
Cheers,
Peter
--
Peter Brett <address@hidden>
Remote Sensing Research Group
Surrey Space Centre
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Re: Help needed debugging segfault with Guile 1.8.7, rixed, 2010/11/11
Re: Help needed debugging segfault with Guile 1.8.7, Neil Jerram, 2010/11/11
Re: Help needed debugging segfault with Guile 1.8.7, Ludovic Courtès, 2010/11/11