An Automatic Composition Algorithm for Functional Logic Programs

María Alpuente, Moreno Falaschi, Ginés Moreno and Germán Vidal

© Springer-Verlag
Proc. of the 27th Annual Conference on Current Trends in Theory and Practice of Informatics (SOFSEM'2000). Springer LNCS 1963, pp. 289-297, 2000

Functional logic languages with a complete operational semantics are based on narrowing, which combines the instantiation of variables with the reduction of expressions. In this paper, we investigate the relationship between partial evaluation and more general transformations based on folding/unfolding. First, we show that the transformations obtained by partial evaluators can be also achieved by folding/unfolding using a particular kind of eurekas which can be mechanically attained. Then, we propose an algorithm (based on folding/unfolding) which starts with the automatic eureka generation and is able to perform program composition, i.e., it is able to produce a single function definition for some nested functions of the original program. This avoids the construction of intermediate data structures that are produced by the inner function and consumed as inputs by the outer function. As opposed to both partial evaluation and (general) fold/unfold transformations, strong correctness of the transformed programs holds w.r.t. goals which contain calls to the "old" function symbols (i.e., from the original program) as well as to the "new" ones (i.e., introduced during the transformation).

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Germán Vidal