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bug#16366: 24.3.50; [PATCH] GDB Registers buffer - wrong values fontifie

From: Andrzej P
Subject: bug#16366: 24.3.50; [PATCH] GDB Registers buffer - wrong values fontified
Date: Mon, 06 Jan 2014 00:35:04 +0000

When stepping through a program with the GDB graphical interface, the
values in the Registers buffer are fontified with
'font-lock-warning-face' on the step *after* they have changed.  It
makes more sense to highlight changed values on each step.  I guess
that this is a bug.

To reproduce:

 $ emacs -Q

 M-x gdb

 gdb -i=mi emacs <return> (or something suitable)

 M-x gdb-display-registers-buffer

In GUD buffer:

 (gdb) break main
 (gdb) run
Now step by machine instructions (e.g. 'C-x C-a C-i').  The values of
registers in the Registers buffer change but are fontified only on the
following step.

The reason is that in 'gdb-update', 'gdb-changed-registers' is updated
*after* the buffers are updated.  Switching the order of the two
operations as in the following patch solves the problem.  

=== modified file 'lisp/progmodes/gdb-mi.el'
--- lisp/progmodes/gdb-mi.el    2014-01-01 07:43:34 +0000
+++ lisp/progmodes/gdb-mi.el    2014-01-05 23:08:27 +0000
@@ -1890,10 +1890,11 @@
   ;; gdb-break-list is maintained in breakpoints handler
   (gdb-get-buffer-create 'gdb-breakpoints-buffer)
+  (gdb-get-changed-registers)
   (unless no-proc
     (gdb-emit-signal gdb-buf-publisher 'update))
-  (gdb-get-changed-registers)
   (when (and (boundp 'speedbar-frame) (frame-live-p speedbar-frame))
     (dolist (var gdb-var-list)
       (setcar (nthcdr 5 var) nil))

In GNU Emacs (x86_64-unknown-linux-gnu, GTK+ Version 3.4.2)
 of 2014-01-05 on andrzej-laptop
Bzr revision: 115879 address@hidden
Windowing system distributor `The X.Org Foundation', version 11.0.11103000
System Description:     Trisquel 6.0

Important settings:
  value of $LC_MONETARY: en_GB.UTF-8
  value of $LC_NUMERIC: en_GB.UTF-8
  value of $LC_TIME: en_GB.UTF-8
  value of $LANG: en_GB.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
M-x r e p o r t SPC e m <tab> <return>

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.

Load-path shadows:
None found.

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