A modular, polyvariant and type-based closure analysis

  • Authors:
  • Anindya Banerjee

  • Affiliations:
  • Xinotech Research, Minneapolis, MN

  • Venue:
  • ICFP '97 Proceedings of the second ACM SIGPLAN international conference on Functional programming
  • Year:
  • 1997

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Abstract

We observe that the principal typing property of a type system is the enabling technology for modularity and separate compilation [10]. We use this technology to formulate a modular and polyvariant closure analysis, based on the rank 2 intersection types annotated with control-flow information.Modularity manifests itself in a syntax-directed, annotated-type inference algorithm that can analyse program fragments containing free variables: a principal typing property is used to formalise it. Polyvariance manifests itself in the separation of different behaviours of the same function at its different uses: this is formalised via the rank 2 intersection types. As the rank 2 intersection type discipline types at least all (core) ML programs, our analysis can be used in the separate compilation of such programs.