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

[Eli Zaretskii]

> From: Dan Nicolaescu <dann@gnu.org>
> Cc: 9948@debbugs.gnu.org
> Date: Thu, 03 Nov 2011 19:30:55 -0400
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> >> From: Dan Nicolaescu <dann@gnu.org>
> >> Date: Thu, 03 Nov 2011 17:55:03 -0400
> >> 
> >>       aggressive =
> >>       scrolling_up
> >>       ? BVAR (current_buffer, scroll_up_aggressively)
> >>       : BVAR (current_buffer, scroll_down_aggressively);
> >>        ^^^^^^^^^^^^^^^^^^
> >>       This one
> >
> > How can this be uninitialized?  This is a buffer-local value of a
> > variable that is initialized to nil on buffer.c.
> 
> The line might be incorrect, are all the variables in that expression
> initialized correctly?

I think so, yes.  The only other variables are:

  . current_buffer -- a global variable that always has some value

  . scrolling_up -- computed in the line above this snippet.  It
    depends on margin_pos, which is initialized at the beginning of
    the parent block.

The BVAR macro doesn't reference any variables except its first
argument.

So I'm really puzzled about this one.  Is there any way to ask
valgrind for a more detailed report?