Unbounded Symbolic Execution for Program Verification

  • Joxan Jaffar
  • Jorge A. Navas
  • Andrew E. Santosa
Part of the Lecture Notes in Computer Science book series (LNCS, volume 7186)

Abstract

Symbolic execution with interpolation is emerging as an alternative to cegar for software verification. The performance of both methods relies critically on interpolation in order to obtain the most general abstraction of the current symbolic or abstract state which can be shown to remain error-free. cegar naturally handles unbounded loops because it is based on abstract interpretation. In contrast, symbolic execution requires a special extension for such loops.

In this paper, we present such an extension. Its main characteristic is that it performs eager subsumption, that is, it always attempts to perform abstraction in order to avoid exploring redundant symbolic states. It balances this primary desire for more abstraction with the secondary desire to maintain the strongest loop invariant, for earlier detection of infeasible paths, which entails less abstraction. Occasionally certain abstractions are not permitted because of the reachability of error states; this is the underlying mechanism which then causes selective unrolling, that is, the unrolling of a loop along relevant paths only.

Keywords

Symbolic Execution Symbolic State Constraint Logic Program Predicate Abstraction Loop Invariant 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • Joxan Jaffar
    • 1
  • Jorge A. Navas
    • 1
  • Andrew E. Santosa
    • 2
  1. 1.National University of SingaporeSingapore
  2. 2.University of SydneyAustralia

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