A Step-Indexed Kripke Model of Hidden State via Recursive Properties on Recursively Defined Metric Spaces

  • Jan Schwinghammer
  • Lars Birkedal
  • Kristian St ø vring
Part of the Lecture Notes in Computer Science book series (LNCS, volume 6604)


Frame and anti-frame rules have been proposed as proof rules for modular reasoning about programs. Frame rules allow one to hide irrelevant parts of the state during verification, whereas the anti-frame rule allows one to hide local state from the context. We give the first sound model for Charguéraud and Pottier’s type and capability system including both frame and anti-frame rules. The model is a possible worlds model based on the operational semantics and step-indexed heap relations, and the worlds are constructed as a recursively defined predicate on a recursively defined metric space.

We also extend the model to account for Pottier’s generalized frame and anti-frame rules, where invariants are generalized to families of invariants indexed over pre-orders. This generalization enables reasoning about some well-bracketed as well as (locally) monotonic uses of local state.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • Jan Schwinghammer
    • 1
  • Lars Birkedal
    • 2
  • Kristian St ø vring
    • 3
  1. 1.Saarland UniversityGermany
  2. 2.ITUniversity of CopenhagenDenmark
  3. 3.DIKUUniversity of CopenhagenDenmark

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