Abstract

We present a tool that implements Owicki-Gries and relyguarantee methods for the compositional verification of multithreaded programs. Our tool computes the requisite auxiliary assertions automatically using an abstraction and refinement procedure. Our procedure is based on a Horn clause encoding of refinement queries and facilitates the discovery of thread-modular proofs when such proofs exist. We present the tool and its evaluation on a collection of benchmarks, including a direct comparison of the effectiveness of the proof rules.

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