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Unfolding for CHR programs

Published online by Cambridge University Press:  08 October 2013

MAURIZIO GABBRIELLI ,
MARIA CHIARA MEO ,
PAOLO TACCHELLA  and
HERBERT WIKLICKY
MAURIZIO GABBRIELLI
Affiliation:
Department of Computer Science/Focus, Università di Bologna/INRIA Mura Anteo Zamboni 7, 40127 Bologna, Italy (email: gabbri@cs.unibo.it)
MARIA CHIARA MEO
Affiliation:
Dipartimento di Economia, Università di Chieti-Pescara Viale Pindaro 42, 65127 Pescara, Italy (email: cmeo@unich.it)
PAOLO TACCHELLA
Affiliation:
Università di Bologna, Mura Anteo Zamboni 7, 40127 Bologna, Italy (email: Paolo.Tacchella@cs.unibo.it)
HERBERT WIKLICKY
Affiliation:
Imperial College London, 180 Queen's Gate, London SW7 2BZ, UK (email: herbert@doc.ic.ac.uk)
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Abstract

Program transformation is an appealing technique which allows to improve run-time efficiency, space-consumption, and more generally to optimize a given program. Essentially, it consists of a sequence of syntactic program manipulations which preserves some kind of semantic equivalence. Unfolding is one of the basic operations used by most program transformation systems and consists of the replacement of a procedure call by its definition. While there is a large body of literature on the transformation and unfolding of sequential programs, very few papers have addressed this issue for concurrent languages. This paper defines an unfolding system for Constraint Handling Rules programs. We define an unfolding rule, show its correctness and discuss some conditions that can be used to delete an unfolded rule while preserving the program meaning. We also prove that, under some suitable conditions, confluence and termination are preserved by the above transformation.

Keywords

CHR (Constraint Handling Rules)program transformationunfoldingconfluencetermination
Type
Regular Papers
Information
Theory and Practice of Logic Programming , Volume 15 , Issue 3 , May 2015 , pp. 264 - 311
Copyright
Copyright © Cambridge University Press 2013 

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