From: martin rudalics <rudalics@gmx.at>
To: Alan Mackenzie <acm@muc.de>
Cc: 44724@debbugs.gnu.org
Subject: bug#44724: Uninitialised variables in syntax.c cause trouble.
Date: Thu, 19 Nov 2020 09:25:50 +0100 [thread overview]
Message-ID: <ce6c38be-1afd-5963-3fab-9585b29d6589@gmx.at> (raw)
In-Reply-To: <20201118202610.GB10071@ACM>
>> Just curious: Did current_buffer == find_start_buffer really succeed
>> in your scenario?
>
> Yes it did. All four comparisons in that block of code succeeded,
> causing a spurious value to be returned by find_defun_start.
Isn't the probability for such a thing to be caused by uninitialized
variables lower than that of the Emacs tagging scheme to fail as a
whole?
> But now I think that that value was a previously valid one which just
> hadn't been updated on buffer changes.
>
> I don't think there's any cache invalidation code associated with this
> cache,
MODIFF == find_start_modiff
> and I think that's why it gave an invalid result.
martin
next prev parent reply other threads:[~2020-11-19 8:25 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-18 17:38 bug#44724: Uninitialised variables in syntax.c cause trouble Alan Mackenzie
2020-11-18 17:57 ` martin rudalics
2020-11-18 20:26 ` Alan Mackenzie
2020-11-19 8:25 ` martin rudalics [this message]
2020-11-19 16:30 ` Alan Mackenzie
2020-11-24 8:02 ` Lars Ingebrigtsen
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