PROB: un outil de modélisation formelle

The development of formal models is often a key step when developing safety or mission critical software. In this setting it is vital to formally check and validate these formal models. We present PROB, a toolset for formal models expressed in the B method, which was developed using constraint logic programming technology. PROB allows fully automatic animation of B models, and can be used to systematically check a B model for errors. PROB supports B features such as non-deterministic operations, ANY statements, operations with complex arguments, sets, sequences, functions, lambda abstractions, set comprehensions, constants and properties, and many more. PROB’s animation facilities allow users to gain confidence in their specifications, and unlike other animators, the user does not have to guess the right values for the operation arguments or choice variables. This is achieved by using co-routining and finite domain constraint solving. On top of the animation features, PROB contains a temporal model checker and a constraint-based model checker, both of which can be used to detect various errors in B specifications. MOTS-CLÉS : programmation logique avec contraintes, vérification, méthode B