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[Frama-c-discuss] Assigns clause

  • Subject: [Frama-c-discuss] Assigns clause
  • From: virgile.prevosto at (Virgile Prevosto)
  • Date: Wed, 25 Sep 2013 08:56:25 +0200
  • In-reply-to: <>
  • References: <>


2013/9/24 Rovedy Aparecida Busquim e Silva <rovedy at>:
> However, we would like to write a more precise assigns clause for the Interp
> array that has two or three elements according to Itab value.
> In the requires and ensures clauses the Itab value was considered, for
> example:
> requires Itab != 1 ==> \valid_range (Interp,0,2);
> requires Itab == 1 ==> \valid_range (Interp,0,1);
> How to write the assigns clause for the Interp array taking in account the
> Itab value?
The easiest way is to provide behaviors. Note in addition that
\valid_range has been deprecated. You should use
\valid instead:

    requires Itab == 0 || Itab == 1;
    behavior Itab_is_one:
    assumes Itab == 1;
    requires \valid(Interp + (0..1));
    assigns Interp[0..1];
    behavior Itab_is_zero:
    assumes Itab==0;
   requires \valid(Interp+(0..2));
   assigns Interp[0..2];

Best regards,
E tutto per oggi, a la prossima volta