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[Frama-c-discuss] Problem with predicate and location labels

  • Subject: [Frama-c-discuss] Problem with predicate and location labels
  • From: hollas at informatik.htw-dresden.de (Boris Hollas)
  • Date: Fri, 18 Feb 2011 12:42:25 +0100 (CET)
On Thu, 2011-02-17 at 16:16 +0100, BAUDIN Patrick wrote:
Perhaps you needs to defines predicates having pointers as arguments.
>
> For example, contract
> //@ensures x==\old(x) ;
> bar();
>
> can be defined as follow:
> //@predicate bar_spec{L1,L2}(int * p) = \at(*p, L1) == at(*p, L1);
> //@ensures bar_spec{Here,Old}(&x) ;
> bar();
>
With

/*@	predicate unchanged{P,H}(bool* p) =
		\at(*p, P) <==> \at(*p, H);
*/

and

ensures unchanged{P,H}(&this->active)

I get "user error: no label in the context".

-- 
Regards,
Boris