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Verifying relations between programs arises as a task in various verificationcontexts such as optimizing transformations, relating new versions of programswith older versions (regression verification), and noninterference. However,relational verification for programs acting on dynamically allocated mutablestate is not well supported by existing tools, which provide a high level ofautomation at the cost of restricting the programs considered. Auto-activetools, on the other hand, require more user interaction but enable verificationof a broader class of programs. This article presents WhyRel, a tool for theauto-active verification of relational properties of pointer programs based onrelational region logic. WhyRel is evaluated through verification case studies,relying on SMT solvers orchestrated by the Why3 platform on which it builds.Case studies include establishing representation independence of ADTs, showingnoninterference, and challenge problems from recent literature.

The WhyRel Prototype for Relational Verification