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


From: Eli Zaretskii
Subject: bug#5858: 24.0.50; bidi aborts: "can't happen" happens
Date: Thu, 08 Apr 2010 20:42:57 +0300

> From: Ari Roponen <address@hidden>
> Date: Thu, 08 Apr 2010 12:03:55 +0300
> Cc: 
> 
> the following code crashes emacs by making code in bidi.c call
> abort():
> 
>   (let ((bidi-display-reordering t))
>     (insert #x650 #x650)              ; ARABIC KASRA
>     (redisplay))

Heh, a brain-fart from 9 years ago that came back to haunt me...

> 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

Yours is an optimized build, right?  Because, in an unoptimized build,
it's a different call to `abort' that is triggered:

  #1  0x011a3931 in bidi_resolve_neutral (bidi_it=0x82d2f8) at bidi.c:1600
  1600                    abort ();
  (gdb) l
  1595                        bidi_copy_it (bidi_it, &saved_it);
  1596                        return bidi_it->type;
  1597                      }
  1598                    break;
  1599                  default:
  1600                    abort ();  <<<<<<<<<<<<<<<<<
  1601                }
  1602              type = bidi_resolve_neutral_1 
(saved_it.prev_for_neutral.type,

  1603                                             next_type, current_level);
  1604              saved_it.type = type;

Anyway, I think I fixed it (revno 99851); please try again after
updating your tree.  If it still doesn't work, please re-open this
bug.

Thanks for reporting this.






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