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Deciding inclusion of set constants over infinite non-strict data structures

Published online by Cambridge University Press:  18 July 2007

Manfred Schmidt-Schauss ,
David Sabel  and
Marko Schütz
Manfred Schmidt-Schauss
Affiliation:
Institut für Informatik, Johann Wolfgang Goethe-Universität, Postfach 11 19 32, 60054 Frankfurt, Germany; schauss@ki.informatik.uni-frankfurt.de
David Sabel
Affiliation:
Institut für Informatik, Johann Wolfgang Goethe-Universität, Postfach 11 19 32, 60054 Frankfurt, Germany; schauss@ki.informatik.uni-frankfurt.de
Marko Schütz
Affiliation:
Dept. of Mathematics and Computing Science, University of the South Pacific, Suva, Fiji Islands; schutz_m@usp.ac.fj
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Abstract

Various static analyses of functional programming languages that permit infinite data structures make use of set constants like Top, Inf, and Bot, denoting all terms, all lists not eventually ending in Nil, and all non-terminating programs, respectively. We use a set language that permits union, constructors and recursive definition of set constants with a greatest fixpoint semantics in the set of all, also infinite, computable trees, where all term constructors are non-strict. This paper proves decidability, in particular DEXPTIME-completeness, of inclusion of co-inductively defined sets by using algorithms and results from tree automata and set constraints. The test for set inclusion is required by certain strictness analysis algorithms in lazy functional programming languages and could also be the basis for further set-based analyses.

Keywords

Functional programming languageslambda calculusstrictness analysisset constraintstree automata
Type
Research Article
Information
RAIRO - Theoretical Informatics and Applications , Volume 41 , Issue 2 , April 2007 , pp. 225 - 241
Copyright
© EDP Sciences, 2007

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