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bug#9948: valgrind warning: Conditional jump or move depends on uninitia
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From: |
Paul Eggert |
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Subject: |
bug#9948: valgrind warning: Conditional jump or move depends on uninitialised value(s) in redisplay_window |
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Date: |
Sun, 06 Nov 2011 22:08:54 -0800 |
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User-agent: |
Mozilla/5.0 (X11; Linux i686; rv:7.0.1) Gecko/20110929 Thunderbird/7.0.1 |
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....