Compositional verification of asynchronous processes via constraint solving

We investigate the foundations of a constraint-based compositional verification method for infinite-state systems. We first consider an asynchronous process calculus which is an abstract formalization of several existing languages based on the blackboard model. For this calculus we define a constraint-based symbolic representation of finite computations of a compositional model based on traces. The constraint system we use combines formulas of integer arithmetics with equalities over uninterpreted functions in which satisfiability is decidable. The translation is inductively defined via a CLP program. Execution traces of a process can be compositionally obtained from the solutions of the answer constraints of the CLP encoding. This way, the task of compositional verification can be reduced to constraint computing and solving.