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arXiv · 1612.07682

Random generation of closed simply-typed $λ$-terms: a synergy between logic programming and Boltzmann samplers

Maciej Bendkowski·Katarzyna Grygiel·Paul Tarau
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Abstract

A natural approach to software quality assurance consists in writing unit tests securing programmer-declared code invariants. Throughout the literature a great body of work has been devoted to tools and techniques automating this labour-intensive process. A prominent example is the successful use of randomness, in particular random typeable $λ$-terms, in testing functional programming compilers such as the Glasgow Haskell Compiler. Unfortunately, due to the intrinsically difficult combinatorial structure of typeable $λ$-terms no effective uniform sampling method is known, setting it as a fundamental open problem in the random software testing approach. In this paper we combine the framework of Boltzmann samplers, a powerful technique of random combinatorial structure generation, with today's Prolog systems offering a synergy between logic variables, unification with occurs check and efficient backtracking. This allows us to develop a novel sampling mechanism able to construct uniformly random closed simply-typed $λ$-terms of up size 120. We apply our techniques to the generation of uniformly random closed simply-typed normal forms and design a parallel execution mechanism pushing forward the achievable term size to 140. Under consideration in Theory and Practice of Logic Programming (TPLP).

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Maciej Bendkowski, Katarzyna Grygiel, Paul Tarau. 2017-09-13. Random generation of closed simply-typed $λ$-terms: a synergy between logic programming and Boltzmann samplers. https://arxiv.org/abs/1612.07682

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