Iterating Octagons

  • Authors:
  • Marius Bozga;Codruţa Gîrlea;Radu Iosif

  • Affiliations:
  • VERIMAG/CNRS, Gières, France 38610;VERIMAG/CNRS, Gières, France 38610;VERIMAG/CNRS, Gières, France 38610

  • Venue:
  • TACAS '09 Proceedings of the 15th International Conference on Tools and Algorithms for the Construction and Analysis of Systems: Held as Part of the Joint European Conferences on Theory and Practice of Software, ETAPS 2009,
  • Year:
  • 2009

Quantified Score

Hi-index 0.00

Visualization

Abstract

In this paper we prove that the transitive closure of a non-deterministic octagonal relation using integer counters can be expressed in Presburger arithmetic. The direct consequence of this fact is that the reachability problem is decidable for flat counter automata with octagonal transition relations. This result improves the previous results of Comon and Jurski [7] and Bozga, Iosif and Lakhnech [6] concerning the computation of transitive closures for difference bound relations. The importance of this result is justified by the wide use of octagons to computing sound abstractions of real-life systems [15]. We have implemented the octagonal transitive closure algorithm in a prototype system for the analysis of counter automata, called FLATA, and we have experimented with a number of test cases.