GNU bug report logs - #874
Args out of range with new auto-composition implementation

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Message #5 received at submit <at> emacsbugs.donarmstrong.com (full text, mbox):

From: "Juanma Barranquero" <lekktu <at> gmail.com>
To: "Emacs Bug Tracker" <submit <at> debbugs.gnu.org>
Subject: Args out of range with new auto-composition implementation
Date: Wed, 3 Sep 2008 18:21:51 +0200

;;; testbug.el ;;;
(column-number-mode 1)

(defun testbug ()
  (interactive)
  (split-window)
  (other-window 1)
  (pop-to-buffer (get-buffer-create "testbug")))
;;;;;;;;;;;;;;;;;

emacs -Q -l testbug.el
C-h H
M-: (goto-char 276) <RET>   ;; or move the cursor to any auto-composed char
M-x testbug <RET>

  => "Args out of range: 274, 274"

(and the windows are not correctly painted.)

At home's laptop I can reproduce the bug at will; as a weird
datapoint, at work I've only been able to reproduce it when the buffer
is called "*ielm*", even if IELM is *not* loaded.

emacs-devel discussion (including a backtrace):

http://lists.gnu.org/archive/html/emacs-devel/2008-09/msg00045.html

Message #10 received at 874 <at> emacsbugs.donarmstrong.com (full text, mbox):

From: "Juanma Barranquero" <lekktu <at> gmail.com>
To: 874 <at> debbugs.gnu.org
Subject: Re: bug#874: Args out of range with new auto-composition implementation
Date: Thu, 4 Sep 2008 17:25:46 +0200

On Wed, Sep 3, 2008 at 18:21, Juanma Barranquero <lekktu <at> gmail.com> wrote:

> emacs -Q -l testbug.el
> C-h H
> M-: (goto-char 276) <RET>   ;; or move the cursor to any auto-composed char
> M-x testbug <RET>
>
>  => "Args out of range: 274, 274"

Curious. The out of range error is caused by this code in
textprop.c:validate_interval_range

      if (!(BUF_BEGV (b) <= XINT (*begin) && XINT (*begin) <= XINT (*end)
	    && XINT (*end) <= BUF_ZV (b)))
	  args_out_of_range (*begin, *end);

At that point,

  BUF_BEGV (b)  = 1
  BUF_ZV (b)    = 1
  XINT (*begin) = 274
  XINT (*end)   = 274

where *begin and *end point to the position in buffer "HELLO", but b
(and hence object, from which b is extracted) points to the just
created buffer "testbug":

(gdb) p object
$1 = 64949764
(gdb) xbuffer
$2 = (struct buffer *) 0x3df0e00
(unsigned char *) 0x3de6880 "testbug"

so it's no wonder it fails.

Message #17 received at 874-done <at> emacsbugs.donarmstrong.com (full text, mbox):

From: "Juanma Barranquero" <lekktu <at> gmail.com>
To: "Kenichi Handa" <handa <at> m17n.org>
Cc: emacs-devel <at> gnu.org, 874-done <at> debbugs.gnu.org
Subject: Re: Args out of range with new auto-composition implementation
Date: Fri, 12 Sep 2008 10:56:39 +0200

On Fri, Sep 12, 2008 at 08:32, Kenichi Handa <handa <at> m17n.org> wrote:

> Anyway, I've just installed a workaround of not handling
> automatic composition if the current buffer is not
> associated with a window.

That fixes the problem. Thanks.

 Juanma

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