Bad variables under control

  • Authors:
  • Andrzej S. Murawski

  • Affiliations:
  • Oxford University Computing Laboratory, Oxford, UK

  • Venue:
  • CSL'07/EACSL'07 Proceedings of the 21st international conference, and Proceedings of the 16th annuall conference on Computer Science Logic
  • Year:
  • 2007

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Abstract

We give a fully abstract game model for Idealized Algol with non-local control flow. In contrast to most previous papers on game semantics, we do not need to include the bad-variable constructor mkvar to obtain full abstraction. Using the model we show that, unlike in the "control-free" case, the presence of mkvar does affect observational equivalence. We conclude by discussing the effect of mkvar on nondeterministic and probabilistic variants of Idealized Algol.