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Definite Reference Mutability

Author Ana Milanova



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Ana Milanova
  • Dept. of Computer Science, Rensselaer Polytechnic Institute, 110 8th Street, Troy NY, USA

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Ana Milanova. Definite Reference Mutability. In 32nd European Conference on Object-Oriented Programming (ECOOP 2018). Leibniz International Proceedings in Informatics (LIPIcs), Volume 109, pp. 25:1-25:30, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2018)
https://doi.org/10.4230/LIPIcs.ECOOP.2018.25

Abstract

Reference immutability type systems such as Javari and ReIm ensure that a given reference cannot be used to mutate the referenced object. These systems are conservative in the sense that a mutable reference may be mutable due to approximation. In this paper, we present ReM (for definite Re[ference] M[utability]). It separates mutable references into (1) definitely mutable, and (2) maybe mutable, i.e., references whose mutability is due to inherent approximation. In addition, we propose a CFL-reachability system for reference immutability, and prove that it is equivalent to ReIm/ReM, thus building a novel framework for reasoning about correctness of reference immutability type systems. We have implemented ReM and applied it on a large benchmark suite. Our results show that approximately 86.5% of all mutable references are definitely mutable.

Subject Classification

ACM Subject Classification
  • Theory of computation → Program analysis
  • Software and its engineering → General programming languages
Keywords
  • reference immutability
  • type inference
  • CFL-reachability
  • precision

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