Deductive Software Verification – The KeY Book

Volume 10001 of the series Lecture Notes in Computer Science pp 289-351


Modular Specification and Verification

  • Daniel GrahlAffiliated withKarlsruhe Institute of Technology
  • , Richard BubelAffiliated withTechnische Universität Darmstadt
  • , Wojciech MostowskiAffiliated withHalmstad Universtiy
  • , Peter H. SchmittAffiliated withKarlsruhe Institute of Technology
  • , Mattias UlbrichAffiliated withKarlsruhe Institute of Technology Email author 
  • , Benjamin WeißAffiliated withKarlsruhe Institute of Technology

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In this chapter, concepts already addressed in previous chapters are reconsidered and extended to cater for modularity. In particular, it is shown how method contracts can be used in proofs (as opposed to being verified themselves). Another central topic is nonfunctional framing information, i.e., information on what locations a method may write to or read from. But, there are also items that are discussed here in depth for the first time: model methods, an abstraction of Java methods that are only used in specification, verification of recursive methods, and object invariants. For any of the arising proof obligations the calculus rules needed to dispatch them are shown.