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Dynamic Frame Idioms in Program Verification

Demonstrating the concept of dynamic frames in program verification using Dafny, with examples and exercises from RockBand and RockBand2. Includes links to resources for further exploration.

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Dynamic Frame Idioms in Program Verification

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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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