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Type-safe Refactorings for Alloy

Rohit GheyiPaulo BorbaTiago Massoni

Refactorings are usually proposed in an ad hoc way because it is difficult to prove that they are sound with respect to a formal semantics, not guaranteeing the absence of type errors or semantic changes. Consequently, developers using refactoring tools must rely on compilation and tests to ensure type-correctness and semantics preservation, respectively, which may not be satisfactory to critical software development. In this paper, we propose a static semantics for Alloy, which is a formal objectoriented modeling language, in Prototype Verification System (PVS). The static semantics’ formalization can be useful for specifying and proving that transformations in general (not only refactorings) do not introduce type errors, for instance, as we show here.

http://www.lbd.dcc.ufmg.br/colecoes/sbmf/2005/015.pdf

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