Reachability Logic in K

This paper presents a language-independent proof system for reachability properties of programs written in non-deterministic (concurrent) languages, referred to as reachability logic. The proof system derives partial-correctness properties with either all-path or one-path semantics, i.e., that states satisfying a given precondition reach states satisfying a given postcondition on all execution paths, respectively on one execution path. Reachability logic takes as axioms any unconditional operational semantics, and is sound (i.e., partially correct) and (relatively) complete, independent of the object language; the soundness has also been mechanized. The proof system is implemented in a tool for semantics-based verification as part of the K framework, and evaluated on a few examples.unpublishednot peer reviewe