Frama-C-discuss mailing list archives

This page gathers the archives of the old Frama-C-discuss archives, that was hosted by Inria's gforge before its demise at the end of 2020. To search for mails newer than September 2020, please visit the page of the new mailing list on Renater.

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[Frama-c-discuss] Small function on buffer doesn't verify

  • Subject: [Frama-c-discuss] Small function on buffer doesn't verify
  • From: Claude.Marche at inria.fr (Claude Marche)
  • Date: Sun, 16 May 2010 08:51:59 +0200
  • In-reply-to: <1273591300.4338.8.camel@iti27>
  • References: <1273591300.4338.8.camel@iti27>
I can't test it for the moment, but my guess is that Jessie does not 
consider BUFF_SIZE as a true constant. I'm not sure if the C norm 
guarantees that it cannot change. To check if it is the problem, you can 
try adding BUFF_SIZE == 4 as a precondition.

Anyway, the best solution is to keep using #define

Expanding the macro definitions in annotations is not a task of Jessie 
but of Frama-C kernel.
See the FAQ or the manual about the --pp-annot option

- Claude

Boris Hollas wrote:
> Jessie is unable to verify the following code for reasons that I don't
> understand. I get "?" for postcondition, pointer dereferencing,
> arithmetic overflow. Using #define instead of const doesn't work either
> because it seems that Jessie doesn't read #defines.
>
>
> const int BUFF_SIZE = 4;
>
> /*@ requires \valid(msg+(0..BUFF_SIZE));
>     ensures msg[BUFF_SIZE] == '\0';
> */
> int setFoo(char* msg) {
>   msg[BUFF_SIZE] = '\0';
>   msg[BUFF_SIZE-1] = '\0';
>   return 0;
> }
>
>
>
> _______________________________________________
> Frama-c-discuss mailing list
> Frama-c-discuss at lists.gforge.inria.fr
> http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/frama-c-discuss
>