Efficient monitoring of safety properties

  • Authors:
  • Klaus Havelund;Grigore Roşu

  • Affiliations:
  • NASA Ames Research Center, Kestrel Technology, Moffett Field, CA, USA;University of Illinois at Urbana-Champaign, Department of Computer Science, Moffett Field, CA, USA

  • Venue:
  • International Journal on Software Tools for Technology Transfer (STTT) - Special section on tools and algorithms for the construction and analysis of systems
  • Year:
  • 2004

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Abstract

The problem of testing whether a finite execution trace of events generated by an executing program violates a linear temporal logic (LTL) formula occurs naturally in runtime analysis of software. Two efficient algorithms for this problem are presented in this paper, both for checking safety formulae of the form “always P”, where P is a past-time LTL formula. The first algorithm is implemented by rewriting, and the second synthesizes efficient code from formulae. Further optimizations of the second algorithm are suggested, reducing space and time consumption. Special operators suitable for writing succinct specifications are discussed and shown to be equivalent to the standard past-time operators. This work is part of NASA’s PathExplorer project, the objective of which is to construct a flexible framework for efficient monitoring and analysis of program executions.