Transitive Closures of Regular Relations for Verifying Infinite-State Systems

  • Authors:
  • Bengt Jonsson;Marcus Nilsson

  • Affiliations:
  • -;-

  • Venue:
  • TACAS '00 Proceedings of the 6th International Conference on Tools and Algorithms for Construction and Analysis of Systems: Held as Part of the European Joint Conferences on the Theory and Practice of Software, ETAPS 2000
  • Year:
  • 2000

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Abstract

We consider a model for representing infinite-state and parameterized systems, in which states are represented as strings over a finite alphabet. Actions are transformations on strings, in which the change can be characterized by an arbitrary finite-state transducer. This program model is able to represent programs operating on a variety of data structures, such as queues, stacks, integers, and systems with a parameterized linear topology. The main contribution of this paper is an effective derivation of a general and powerful transitive closure operationf or this model. The transitive closure of an actionrepres ents the effect of executing the actionanarb itrary number of times. For example, the transitive closure of an action which transmits a single message to a buffer will be an action which sends an arbitrarily long sequence of messages to the buffer. Using this transitive closure operation, we show how to model and automatically verify safety properties for several types of infinite-state and parameterized systems.