Sagar Chaki

Sagar Chaki, Edmund Clarke, Orna Grumberg, Joel Ouaknine, Natasha Sharygina, Tayssir Touili, Helmut Veith, Proceedings of the 5th International Conference on Integrated Formal Methods (IFM), LNCS 3771, page 53-69, November 29-December 2, 2005.

Abstract: In the domain of concurrent software verification, there is an evident need for specification formalisms and efficient algorithms to verify branching-time properties that involve both data and communication. We address this problem by defining a new branching-time temporal logic SE-AΩ which integrates both state-based and action-based properties. SE-AΩ is universal, i.e., preserved by the simulation relation, and thus amenable to counterexample-guided abstraction refinement. We provide a model-checking algorithm for this logic, based upon a compositional abstraction-refinement loop which exploits the natural decomposition of the concurrent system into its components. The abstraction and refinement steps are performed over each component separately, and only the model checking step requires an explicit composition of the abstracted components. For experimental evaluation, we have integrated our algorithm within the ComFoRT reasoning framework and used it to verify a piece of industrial robot control software.