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A complete and terminating execution model for Constraint Handling Rules

Published online by Cambridge University Press:  09 July 2010

HARIOLF BETZ ,
FRANK RAISER  and
THOM FRÜHWIRTH
HARIOLF BETZ
Affiliation:
Faculty of Engineering and Computer Science, Ulm University, Germany (e-mail: firstname.lastname@uni-ulm.de)
FRANK RAISER
Affiliation:
Faculty of Engineering and Computer Science, Ulm University, Germany (e-mail: firstname.lastname@uni-ulm.de)
THOM FRÜHWIRTH
Affiliation:
Faculty of Engineering and Computer Science, Ulm University, Germany (e-mail: firstname.lastname@uni-ulm.de)
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Abstract

We observe that the various formulations of the operational semantics of Constraint Handling Rules proposed over the years fall into a spectrum ranging from the analytical to the pragmatic. While existing analytical formulations facilitate program analysis and formal proofs of program properties, they cannot be implemented as is. We propose a novel operational semantics ω!, which has a strong analytical foundation, while featuring a terminating execution model. We prove its soundness and completeness with respect to existing analytical formulations and we provide an implementation in the form of a source-to-source transformation to CHR with rule priorities.

Keywords

Constraint Handling Rulesoperational semanticsexecution modelpersistent constraints
Type
Regular Papers
Information
Theory and Practice of Logic Programming , Volume 10 , Special Issue 4-6: 26th International Conference on Logic Programming , July 2010 , pp. 597 - 610
Copyright
Copyright © Cambridge University Press 2010

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