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bug#6378: all-completions Segfault


From: Thierry Volpiatto
Subject: bug#6378: all-completions Segfault
Date: Wed, 09 Jun 2010 08:18:27 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (gnu/linux)

Thierry Volpiatto <address@hidden> writes:

> Stefan Monnier <address@hidden> writes:
>
>>> Although I don't understand why the code-path for the vector
>>> version can't be simplified as in the following patch, which also
>>> fixes the problem AFAICT:
>>
>>> diff --git a/src/minibuf.c b/src/minibuf.c
>>> index ad81bfd..c6aae27 100644
>>> --- a/src/minibuf.c
>>> +++ b/src/minibuf.c
>>> @@ -1610,22 +1610,14 @@ with a space are ignored unless STRING itself 
>>> starts with a space.  */)
>>>     }
>>>        else if (type == 2)
>>>     {
>>> -     if (!EQ (bucket, zero))
>>> -       {
>>> -         elt = bucket;
>>> -         eltstring = elt;
>>> -         if (XSYMBOL (bucket)->next)
>>> -           XSETSYMBOL (bucket, XSYMBOL (bucket)->next);
>>> -         else
>>> -           XSETFASTINT (bucket, 0);
>>> -       }
>>> -     else if (++index >= obsize)
>>> -       break;
>>> -     else
>>> -       {
>>> -         bucket = XVECTOR (collection)->contents[index];
>>> -         continue;
>>> -       }
>>> +          if ( index < obsize )
>>> +            {
>>> +              elt = bucket;
>>> +              eltstring = elt;
>>> +              bucket = XVECTOR (collection)->contents[++index];
>>> +            }
>>> +          else
>>> +            break;
>>>     }
>>>        else /* if (type == 3) */
>>>     {
>>
>> IIUC this would only loop through all the buckets, without looping
>> through each bucket's linked list.
>> Compare (length obarray)
>> and     (let ((i 0)) (mapatoms (lambda (_) (incf i)) obarray) i)
>
> Don't know if that related but
>
> (completing-read "test: " [1 2 3 23 24 34 26 40 28])
>
> test: 2 ==> TAB
>
> instead of failing crash emacs.

Program received signal SIGSEGV, Segmentation fault.
0x08151015 in Fall_completions ()

-- 
Thierry Volpiatto
Gpg key: http://pgp.mit.edu/






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