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AlloyPE: An SMT-based Proof Engine for Alloy

AlloyPE is a proof engine for system specifications written in Alloy - a declarative first-order relational logic with built-in operators for transitive closure and cardinality. AlloyPE is fully automatic; when it outputs "unsat", the property has been soundly proven, and when it outputs "sat", a sound counterexample has been found. However, it may also time-out or output "unknown" due to the undecidability of the logic. The engine works via a sound translation from the Alloy language to SMT-LIB - the input language of several Satisfiability Modulo Theories (SMT) solvers. The translation is tailored to exploit the increasing capability of modern SMT solvers in handling first-order quantifiers in the unbounded context. In our experiments, we could prove a considerable number of non-trivial system specifications written in Alloy, see the publications below.

 

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We will be happy to share the tool upon your request. Please feel free to send an email to Achraf El Ghazi or Mana Taghdiri.