From: Richard Stallman <rms@gnu.org>
To: emacs-devel@gnu.org
Subject: Display bug
Date: Sun, 11 Mar 2007 21:27:57 -0400 [thread overview]
Message-ID: <E1HQZKP-0006ia-Aa@fencepost.gnu.org> (raw)
Since this happens in the CVS trunk, it should be fixed now.
Has anyone looked at this? Please DTRT and ack.
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From: Kenichi Handa <handa@m17n.org>
To: Kenichi Handa <handa@m17n.org>
In-reply-to: <E1HOoEX-0002hK-18@etlken.m17n.org> (message from Kenichi Handa
on Wed, 07 Mar 2007 13:58:37 +0900)
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Date: Wed, 07 Mar 2007 14:37:39 +0900
Cc: nickrob@snap.net.nz, hongyi.zhao@gmail.com, emacs-devel@gnu.org
Subject: Display bug [Re: My Emacs unicode 2 crash again ...]
In article <E1HOoEX-0002hK-18@etlken.m17n.org>, Kenichi Handa <handa@m17n.org> writes:
> It now shows the correct place of calling abort() as below,
> and I can reproduce the bug by compiling Emacs with
> --enable-asserts.
> Breakpoint 1, abort () at emacs.c:431
> (gdb) bt full
> #0 abort () at emacs.c:431
> No locals.
> #1 0x0808a8ec in try_window_id (w=0x8867cc8) at xdisp.c:15132
[...]
> xassert (w->window_end_bytepos >= 0); <-- line 15132
> IF_DEBUG (debug_method_add (w, "A"));
> }
> I'm now trying to find what is wrong.
I found that the same bug can be reproduced even with Emacs
22 (latest CVS HEAD) when it is configured with
- --enable-asserts. Please try to build Emacs that way, and
run this code:
(defun temp ()
(with-temp-buffer
(switch-to-buffer (current-buffer))
(insert "a-\n-\nd\n")
(let ((nbsp (string (decode-char 'ucs #xa0))))
(while t
(goto-char 1)
(replace-string "-" nbsp)
(sit-for 0.1)
(goto-char 1)
(replace-string nbsp "-")
(sit-for 0.1)))))
It just swaps "-" and NBSP repeatedly. As the logic of the
function try_window_id is quite complicated, I still don't
understand what is wrong. Could someone help? FYI,
(gdb) run
[...]
Breakpoint 1, abort () at emacs.c:431
(gdb) up
#1 0x08086b40 in try_window_id (w=0x85df240) at xdisp.c:14983
(gdb) pp w->buffer
#<buffer *temp*>
(gdb) pp current_buffer->name
" *temp*"
(gdb) p *current_buffer->text
$7 = {
beg = 0x85bf3e0 "a-\n-",
gpt = 5,
z = 8,
gpt_byte = 5,
z_byte = 8,
gap_size = 13,
modiff = 6,
chars_modiff = 6,
save_modiff = 1,
overlay_modiff = 1,
beg_unchanged = 1,
end_unchanged = 3,
unchanged_modified = 4,
overlay_unchanged_modified = 1,
intervals = 0x0,
markers = 0x854d948
}
(gdb) p row->end.pos
$8 = {
charpos = 8,
bytepos = 10
}
(gdb) p w->window_end_bytepos
$9 = -2
(gdb)
It seems that the buffer now contains only ASCII
(i.e. "a-\n-\nd\n"), but row points to a data containing
multibyte characters (NBSP in this case).
- ---
Kenichi Handa
handa@m17n.org
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------- End of forwarded message -------
next reply other threads:[~2007-03-12 1:27 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-12 1:27 Richard Stallman [this message]
2007-03-13 22:13 ` Display bug Chong Yidong
-- strict thread matches above, loose matches on Subject: below --
2007-07-14 1:42 display bug Patrick Drechsler
2007-07-14 1:45 ` Patrick Drechsler
2007-07-14 5:17 ` Carsten Dominik
2002-09-12 3:30 Display bug Richard Stallman
2002-09-14 4:56 ` Karl Eichwalder
[not found] <200208261449.g7QEnIc26640@bacall.nnt.com>
2002-08-28 6:51 ` Richard Stallman
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