A slicing-based approach for locating type errors

  • Authors:
  • F. Tip;T. B. Dinesh

  • Affiliations:
  • IBM T. J. Watson Research Center, Yorktown Heights, NY;Pagelets, Inc., Palo Alto, CA

  • Venue:
  • ACM Transactions on Software Engineering and Methodology (TOSEM)
  • Year:
  • 2001

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Abstract

The effectiveness of a type-checking tool strongly depends on the accuracy of the positional information that is associated with type errors. We present an approach where the location associated with an error message e is defined as a slice Pe of the program P being type-checked. We show that this approach yields highly accurate positional information: Pe is a program that contains precisely those program constructs in P that caused error e. Semantically, we have the interesting property that type-checking Pe is guaranteed to produce the same error e. Our approach is completely language-independent and has been implemented for a significant subset of Pascal. We also report on experiments with object-oriented type systems, and with a subset of ML.