bug#5858: 24.0.50; bidi aborts: "can't happen" happens

[Ari Roponen]

Hi,

the following code crashes emacs by making code in bidi.c call
abort():

  (let ((bidi-display-reordering t))
    (insert #x650 #x650)                ; ARABIC KASRA
    (redisplay))


The place that calls abort() is in bidi_resolve_neutral():

#0  abort () at emacs.c:430
#1  0x0000000000490abe in bidi_resolve_neutral (bidi_it=0x7fffffff9000)
    at bidi.c:1577
#2  0x000000000049119a in bidi_level_of_next_char (bidi_it=0x7fffffff9000)
    at bidi.c:1713
...

(gdb) up
#1  0x0000000000490abe in bidi_resolve_neutral (bidi_it=0x7fffffff9000)
    at bidi.c:1577
1577                      abort ();             /* can't happen: BNs are 
skipped */
(gdb) l
1572                    next_type = STRONG_R;
1573                    saved_it.next_for_neutral.type = STRONG_R;
1574                    break;
1575                  case WEAK_BN:
1576                    if (!bidi_explicit_dir_char (bidi_it->ch))
1577                      abort ();             /* can't happen: BNs are 
skipped */
1578                    /* FALLTHROUGH */
1579                  case NEUTRAL_B:
1580                    /* Marched all the way to the end of this level run.
1581                       We need to use the eor type, whose information is


In GNU Emacs 24.0.50.3 (x86_64-unknown-linux-gnu, GTK+ Version 2.19.7)
 of 2010-04-07 on arirop
Windowing system distributor `Fedora Project', version 11.0.10799901

-- 
Ari Roponen