Efficient Diagnostic Generation for Boolean Equation Systems

  • Authors:
  • Radu Mateescu

  • 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

Boolean Equation Systems (Bess) provide a useful framework for the verification of concurrent finite-state systems. In practice, it is desirable that a Bes resolution also yields diagnosticin formation explaining, preferably in a concise way, the truth value computed for a given variable of the BES. Using a representation of BESs as extended boolean graphs (EBGs), we propose a characterization of full diagnostics (i.e., both examples and counterexamples) as a particular class of subgraphs of the EBG associated to a BES. We provide algorithms that compute examples and counterexamples in linear time and can be straightforwardly used to extend known (global or local) BES resolution algorithms with diagnostic generation facilities.