Decision procedures for algebraic data types with abstractions

P Suter, M Dotta, V Kuncak - Acm Sigplan Notices, 2010 - dl.acm.org
P Suter, M Dotta, V Kuncak
Acm Sigplan Notices, 2010dl.acm.org
We describe a family of decision procedures that extend the decision procedure for
quantifier-free constraints on recursive algebraic data types (term algebras) to support
recursive abstraction functions. Our abstraction functions are catamorphisms (term algebra
homomorphisms) mapping algebraic data type values into values in other decidable
theories (eg sets, multisets, lists, integers, booleans). Each instance of our decision
procedure family is sound; we identify a widely applicable many-to-one condition on …
We describe a family of decision procedures that extend the decision procedure for quantifier-free constraints on recursive algebraic data types (term algebras) to support recursive abstraction functions. Our abstraction functions are catamorphisms (term algebra homomorphisms) mapping algebraic data type values into values in other decidable theories (e.g. sets, multisets, lists, integers, booleans). Each instance of our decision procedure family is sound; we identify a widely applicable many-to-one condition on abstraction functions that implies the completeness. Complete instances of our decision procedure include the following correctness statements: 1) a functional data structure implementation satisfies a recursively specified invariant, 2) such data structure conforms to a contract given in terms of sets, multisets, lists, sizes, or heights, 3) a transformation of a formula (or lambda term) abstract syntax tree changes the set of free variables in the specified way.
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