By Martin Churchill, Peter D. Mosses, Neil Sculthorpe, and Paolo Torrini

Abstract:

Semantic specifications of programming languages typically have poor modularity. This hinders reuse of parts of the semantics of one language when specifying a different language – even when the two languages have many constructs in common – and evolution of a language may require major reformulation of its semantics. Such drawbacks have discouraged language developers from using formal semantics to document their designs.

In the PLanCompS project, we have developed a component-based approach to semantics. Here, we explain its modularity aspects, and present an illustrative case study: a component-based semantics for Caml Light. We have tested the correctness of the semantics by running programs on an interpreter generated from the semantics, comparing the output with that produced on the standard implementation of the language.

Our approach provides good modularity, facilitates reuse, and should support co-evolution of languages and their formal semantics. It could be particularly useful in connection with domain-specific languages and language-driven software development.

In Transactions on Aspect-Oriented Software Development XII, pages 132 – 179, LNCS 8989, Springer, 2015.

Accompanying material

• Authors’ version of the paper. The final publication is available at Springer.
• A ZIP archive containing:
  • the full specification of Caml Light using funcons;
  • Caml Light test programs, together with funcon terms generated from them;
  • I-MSOS specifications for funcons and value operations, together with Prolog code generated from them; and
  • the tools for generating and running the funcon terms and Prolog code.