Formal Verification of UML Statecharts with Real-Time Extensions

  • Authors:
  • Alexandre David;M. Oliver Möller;Wang Yi

  • Affiliations:
  • -;-;-

  • Venue:
  • FASE '02 Proceedings of the 5th International Conference on Fundamental Approaches to Software Engineering
  • Year:
  • 2002

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Abstract

We present a framework for formal verification of a real-time extension of UML statecharts. For clarity, we restrict ourselves to a reasonable subset of the rich UML statechart model and extend this with real-time constructs (clocks, timed guards, and invariants). We equip the obtained formalism, called hierarchical timed automata (HTA), with an operational semantics. We outline a translation of one HTA to a network of flat timed automata, that can serve as input to the real-time model checking tool UPPAAL. This translation can be used to faithfully verify deadlock-freedom, safety, and unbounded response properties of the HTA model. We report on an XML-based implementation of this translation, use the well-known pacemaker example to illustrate our technique, and report run-time data for the formal verification part.