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Introduction to Automatic Program Verification with Dafny

Learn about using and building an automatic program verifier with Dafny language, focusing on abstraction, dynamic frames, and class invariants. Explore the concepts through a demo of RockBand and RockBand2 exercises. Links to resources included.

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Introduction to Automatic Program Verification with Dafny

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  1. Using and Building an Automatic Program Verifier K. Rustan M. Leino Research in Software Engineering (RiSE) Microsoft Research, Redmond Lecture 4 LASER Summer School 2011 Elba, Italy 8 September 2011

  2. Abstraction, frames demo Counter

  3. Dynamic frames, recap • Conceptually:class C {invariantJ; … } • Explicitly in Dafny:class C {function Valid(): bool … { J }ghostvarRepr: set<object>;constructorInit()modifiesthis;ensures Valid() && fresh(Repr – {this});method Mutate()requires Valid();modifiesRepr;ensures Valid() && fresh(Repr– old(Repr)); }

  4. Dynamic frames idiom demo RockBand, RockBand2

  5. Exercises • List • http://rise4fun.com/Dafny/nAW

  6. Links • Dafny • research.microsoft.com/dafny • rise4fun.com/Dafny/tutorial/guide • rise4fun • rise4fun.com • Verification Corner • research.microsoft.com/verificationcorner

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