From: Maxime Devos <maximedevos@telenet.be>
To: Andrew Whatson <whatson@gmail.com>, guile-devel@gnu.org
Subject: Re: [PATCH] Avoid 'frame-local-ref' errors when printing backtrace.
Date: Wed, 21 Sep 2022 12:50:38 +0200 [thread overview]
Message-ID: <56d1283b-ac09-8f62-8657-de99578e1a6c@telenet.be> (raw)
In-Reply-To: <20220920072358.4701-1-whatson@gmail.com>
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On 20-09-2022 09:23, Andrew Whatson wrote:
> => (lambda (binding)
> - (let ((val (frame-local-ref frame (binding-slot binding)
> - (binding-representation binding))))
> + (let* ((slot (binding-slot binding))
> + ;; HACK: Avoid out-of-range from frame-local-ref.
> + ;; Some frames have bindings beyond nlocals. That
> + ;; is probably a bug somewhere else, but at least
> + ;; this workaround allows them to be printed.
> + (val (if (< slot nlocals)
> + (frame-local-ref frame slot
> + (binding-representation binding))
> + ;; else #<unspecified > + )))
I propose to add a link to the bug report in the comments, for future
reference. Also, there is an interest in returning zero values in such
cases: <https://www.mail-archive.com/bug-guile@gnu.org/msg07927.html>
(that patch didn't work out, but the sentiment is still there).
As such, I recommend being explicit:
(if [...]
[...]
*unspecified*)
Greetings,
Maxime.
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next prev parent reply other threads:[~2022-09-21 10:50 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-20 7:23 [PATCH] Avoid 'frame-local-ref' errors when printing backtrace Andrew Whatson
2022-09-21 10:50 ` Maxime Devos [this message]
2022-09-22 13:53 ` Andrew Whatson
2022-09-22 15:10 ` Maxime Devos
2022-10-12 20:34 ` Ludovic Courtès
2022-10-13 3:36 ` Andrew Whatson
2022-10-13 13:09 ` Ludovic Courtès
2023-01-11 5:24 ` Andrew Whatson
2023-01-11 23:03 ` Ludovic Courtès
2023-01-12 2:09 ` Andrew Whatson
2022-11-29 18:06 ` lloda
2022-09-22 13:58 ` Andrew Whatson
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