Linear ranking with reachability

  • Authors:
  • Aaron R. Bradley;Zohar Manna;Henny B. Sipma

  • Affiliations:
  • Computer Science Department, Stanford University, Stanford, CA;Computer Science Department, Stanford University, Stanford, CA;Computer Science Department, Stanford University, Stanford, CA

  • Venue:
  • CAV'05 Proceedings of the 17th international conference on Computer Aided Verification
  • Year:
  • 2005

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Abstract

We present a complete method for synthesizing lexicographic linear ranking functions supported by inductive linear invariants for loops with linear guards and transitions. Proving termination via linear ranking functions often requires invariants; yet invariant generation is expensive. Thus, we describe a technique that discovers just the invariants necessary for proving termination. Finally, we describe an implementation of the method and provide extensive experimental evidence of its effectiveness for proving termination of C loops.