Homer: A Higher-Order Observational Equivalence Model checkER

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Homer: A Higher-Order Observational Equivalence Model checkER
We present HOMER, an observational-equivalence model checker for the 3rd-order fragment of Idealized Algol (IA) augmented with iteration. It works by first translating terms of the fragment into a precise representation of their game semantics as visibly pushdown automata (VPA). The VPA-translates are then passed to a VPA toolkit (which we have implemented) to test for equivahanks to the fully abstract game semantics, observational equivalence of these IA-terms reduces to the VPA Equivalence Problem. Our checker is thus sound and complete; because it model checks open terms, our approach is also compositional. Further, if the terms are inequivalent, HOMER will produce both a game-semantic and an operational-semantic counter-example, in the form of a play and a separating context respectively. We showcase these features on a number of examples and (where appropriate) compare its performance with similar tools. To the best of our knowledge, HOMER is the first implementation of a model ch...
David Hopkins, C.-H. Luke Ong
Added 25 Nov 2009
Updated 25 Nov 2009
Type Conference
Year 2009
Where CAV
Authors David Hopkins, C.-H. Luke Ong
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