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Fixed points and frontiers: a new perspective

Published online by Cambridge University Press:  07 November 2008

Sebastian Hunt  and
Chris Hankin
Sebastian Hunt
Affiliation:
Department of Computing, Imperial College, London
Chris Hankin
Affiliation:
Department of Computing, Imperial College, London
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Abstract

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Abstract interpretation is the collective name for a family of semantics-based techniques for compile-time analysis of programs. One of the most costly operations in automating such analyses is the computation of fixed points. The frontiers algorithm is an elegant method, invented by Chris Clack and Simon Peyton Jones, which addresses this issue.

In this article we present a new approach to the frontiers algorithm based on the insight that frontiers represent upper and lower subsets of a function's argument domain. This insight leads to a new formulation of the frontiers algorithm for higher-order functions, which is considerably more concise than previous versions.

We go on to argue that for many functions, especially in the higher-order case, finding fixed points is an intractable problem unless the sizes of the abstract domains are reduced. We show how the semantic machinery of abstract interpretation allows us to place upper and lower bounds on the values of fixed points in large lattices by working within smaller ones.

Information

Type
Article
Information
Journal of Functional Programming , Volume 1 , Issue 1 , January 1991 , pp. 91 - 120
Copyright
Copyright © Cambridge University Press 1991

References

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