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Extrapolation-based path invariants for abstraction refinement of fifo systems

par Heussner, Alexander Elmar ;Le Gall, Tristan ;Sutre, Grégoire
Référence Lecture notes in computer science, 5578 LNCS, page (107-124)
Publication Publié, 2009

Article révisé par les pairs

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Résumé :

The technique of counterexample-guided abstraction refinement (Cegar) has been successfully applied in the areas of software and hardware verification. Automatic abstraction refinement is also desirable for the safety verification of complex infinite-state models. This paper investigates Cegar in the context of formal models of network protocols, in our case, the verification of fifo systems. Our main contribution is the introduction of extrapolation-based path invariants for abstraction refinement. We develop a range of algorithms that are based on this novel theoretical notion, and which are parametrized by different extrapolation operators. These are utilized as subroutines in the refinement step of our Cegar semi-algorithm that is based on recognizable partition abstractions. We give sufficient conditions for the termination of Cegar by constraining the extrapolation operator. Our empirical evaluation confirms the benefit of extrapolation-based path invariants. © 2009 Springer Berlin Heidelberg.