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

Le ven. 18 f?vr. 2011 12:42:25 CET,
"Boris Hollas" <hollas at informatik.htw-dresden.de> a ?crit :

> 
> /*@	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".
> 

I'm not sure of what you mean by ensures unchanged{P,H}(..). In an
ensures clause, the only label you have are Old, Pre, Post and Here. In
the declaration of the predicate, {P,H} are parameters, so that you
can give them any name. On the other hand, when you use the predicate,
you must instantiate these parameters with labels that exist in the
context. That said, the error should be logic label P not found. Could
you give a complete example that reproduce your issue?
-- 
Virgile Prevosto
Ing?nieur-Chercheur, CEA, LIST
Laboratoire de S?ret? des Logiciels
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