From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Alan Mackenzie <acm@muc.de>
Cc: Eli Zaretskii <eliz@gnu.org>, larsi@gnus.org, emacs-devel@gnu.org
Subject: Re: Redisplay hook error bactraces [Was: Fontification error backtrace]
Date: Wed, 13 Jul 2022 16:45:12 -0400 [thread overview]
Message-ID: <jwvsfn492et.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <Ys8j1eCDyaig/3g+@ACM> (Alan Mackenzie's message of "Wed, 13 Jul 2022 19:58:13 +0000")
> What you suggest would imply a _lot_ of coding to make it happen. Does
> there exist anywhere any support for copyging a specpdl, and somehow
> making a lisp object out of it? Why do you think that copying the
> specpdl would be less work or less risky than directly generating a
> backtrace, as the current code does?
I don't think it needs to be much coding.
Stashing the full specpdl would be more work, admittedly, but turning
the specpdl into a list via something like `backtrace-frames` is trivial
(we could even easily move `backtrace-frames` to C if we wanted to be
paranoid about running ELisp at that point).
> The advantage of directly generating the backtrace is that all the
> infrastructure is already there. We've got mapbacktrace which
> encapsulates the formats of the specpdl. And debug-early.el, whose two
> functions total 60 lines (including doc strings and comments) and don't
> use any other Lisp whatsoever.
That potentially runs a crapload of code via various hooks, many of
which can be influenced by variables dynamically bound in the context of
the error.
Moving the bulk of the work to a normal context means we can be much
more relaxed about using "fully featured" code, so there'll be much less
resistance to over-engineering :-)
Stefan
next prev parent reply other threads:[~2022-07-13 20:45 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-25 13:42 Why is it so difficult to get a Lisp backtrace? Alan Mackenzie
2022-06-25 15:26 ` Alan Mackenzie
2022-06-25 15:30 ` Stefan Kangas
2022-06-25 15:52 ` Alan Mackenzie
2022-06-25 16:27 ` Stefan Kangas
2022-06-25 15:35 ` Lars Ingebrigtsen
2022-06-25 15:59 ` Alan Mackenzie
2022-06-25 16:51 ` Eli Zaretskii
2022-06-25 19:45 ` Alan Mackenzie
2022-06-26 5:20 ` Eli Zaretskii
2022-06-27 19:48 ` Fontification error backtrace [Was: Why is it so difficult to get a Lisp backtrace?] Alan Mackenzie
2022-06-28 11:43 ` Lars Ingebrigtsen
2022-06-28 11:57 ` Eli Zaretskii
2022-06-28 17:28 ` Alan Mackenzie
2022-06-28 18:17 ` Eli Zaretskii
2022-06-28 19:31 ` Alan Mackenzie
2022-06-29 19:00 ` Eli Zaretskii
2022-07-12 19:48 ` Redisplay hook error bactraces [Was: Fontification error backtrace] Alan Mackenzie
2022-07-13 12:33 ` Eli Zaretskii
2022-07-13 18:41 ` Redisplay hook error backtraces Alan Mackenzie
2022-07-13 19:00 ` Eli Zaretskii
2022-07-13 20:12 ` Alan Mackenzie
2022-07-13 20:49 ` Stefan Monnier
2022-07-14 5:12 ` Eli Zaretskii
2022-07-14 9:01 ` Alan Mackenzie
2022-07-14 9:10 ` Eli Zaretskii
2022-07-14 13:42 ` Alan Mackenzie
2022-07-14 13:59 ` Eli Zaretskii
2022-07-14 16:07 ` Alan Mackenzie
2022-07-14 16:18 ` Stefan Monnier
2022-07-14 19:47 ` Alan Mackenzie
2022-07-14 20:48 ` Stefan Monnier
2022-07-15 5:50 ` Eli Zaretskii
2022-07-15 18:18 ` Alan Mackenzie
2022-07-16 6:03 ` Eli Zaretskii
2022-07-14 17:09 ` Eli Zaretskii
2022-07-14 19:33 ` Alan Mackenzie
2022-07-16 6:12 ` Eli Zaretskii
2022-07-16 15:45 ` Alan Mackenzie
2022-07-13 19:13 ` Redisplay hook error bactraces [Was: Fontification error backtrace] Stefan Monnier
2022-07-13 19:24 ` Eli Zaretskii
2022-07-13 19:58 ` Alan Mackenzie
2022-07-13 20:45 ` Stefan Monnier [this message]
2022-06-30 20:34 ` Fontification error backtrace [Was: Why is it so difficult to get a Lisp backtrace?] Stefan Monnier
2022-07-01 5:39 ` Eli Zaretskii
2022-07-01 15:34 ` Juri Linkov
2022-07-01 16:04 ` Eli Zaretskii
2022-07-01 19:14 ` Juri Linkov
2022-07-01 19:26 ` Stefan Monnier
2022-07-02 5:53 ` Eli Zaretskii
2022-07-02 21:15 ` Stefan Monnier
2022-07-02 20:27 ` Alan Mackenzie
2022-07-02 21:12 ` Stefan Monnier
2022-06-26 8:45 ` Why is it so difficult to get a Lisp backtrace? Stefan Monnier
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