GNU bug report logs - #44724
Uninitialised variables in syntax.c cause trouble.

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From: martin rudalics <rudalics <at> gmx.at>
To: Alan Mackenzie <acm <at> muc.de>
Cc: 44724 <at> debbugs.gnu.org
Subject: bug#44724: Uninitialised variables in syntax.c cause trouble.
Date: Thu, 19 Nov 2020 09:25:50 +0100

>> 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

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