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Année 1993

Communications à des congrés, colloques, etc.

Layer sharing : an improved structure–sharing framework. In Proc. of POPL'93, pages 345–356, 1993.
Éric Villemonte de La Clergerie.
[BibTeX] [PS Compressed]
We present in this paper a structure–sharing framework originally developed for a Dynamic Programming interpreter of Logic Programs called DyALog. This mechanism should be of interest for alternative execution models of PROLOG which maintain multiple computation branches and reuse sub–computations in various contexts (computation sharing). This category includes, besides our Dynamic Programming model, the tabular models (OLDT, SLDAL, XWAM), the “magic-set” models, and the independent AND and OR parallelism with solution sharing models. These models raise the problem of storing vast amount of data, motivating us to discard copying mechanisms in favor of structure–sharing mechanisms. Unfortunately, computation sharing requires joining computation branches and possibly renaming some variables, which generally leads to complex structure–sharing mechanisms. The proposed “layer–sharing” framework succeeds however in remaining understandable and easy to implement.

Eric de la Clergerie
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