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Introduction to Automatic Program Verification with Dafny

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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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Presentation Transcript

  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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