Language support for regions

  • Authors:
  • David Gay;Alex Aiken

  • Affiliations:
  • EECS Department, University of California, Berkeley;EECS Department, University of California, Berkeley

  • Venue:
  • Proceedings of the ACM SIGPLAN 2001 conference on Programming language design and implementation
  • Year:
  • 2001

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Abstract

Region-based memory management systems structure memory by grouping objects in regions under program control. Memory is reclaimed by deleting regions, freeing all objects stored therein. Our compiler for C with regions, RC, prevents unsafe region deletions by keeping a count of references to each region. Using type annotations that make the structure of a program's regions more explicit, we reduce the overhead of reference counting from a maximum of 27% to a maximum of 11% on a suite of realistic benchmarks. We generalise these annotations in a region type system whose main novelty is the use of existentially quantified abstract regions to represent pointers to objects whose region is partially or totally unknown. A distribution of RC is available at http://www.cs.berkeley.edu/~dgay/rc.tar.gz.