GNU bug report logs - #9948
valgrind warning: Conditional jump or move depends on uninitialised value(s) in redisplay_window

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Package: emacs;

Reported by: Dan Nicolaescu <dann <at> gnu.org>

Date: Thu, 3 Nov 2011 21:58:01 UTC

Severity: minor

Tags: unreproducible

Done: npostavs <at> users.sourceforge.net

Bug is archived. No further changes may be made.

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From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 9948 <at> debbugs.gnu.org
Subject: bug#9948: valgrind warning: Conditional jump or move depends on uninitialised value(s) in redisplay_window
Date: Sun, 06 Nov 2011 22:08:54 -0800

On 11/06/11 22:00, Eli Zaretskii wrote:
> Again, I don't see how any of this could involve an uninitialized
> variable.

I don't either, but the analysis you gave is not complete.
For example:

  SET_TEXT_POS_FROM_MARKER (startp, w->start);

does not set startp to a valid charpos if w->start
points to uninitialized data.

A problem with valgrind is that this sort of analysis
can be very painful to do, if one wants to do it completely.
I found this out the hard way when trying to apply valgrind
to Emacs's garbage collector....
This bug report was last modified 8 years and 319 days ago.

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