Abstract
Reasoning about program variables as sets of “values” leads to a simple, accurate and intuitively appealing notion of program approximation. This paper presents approach for the compile-time analysis of ML programs. To develop the core ideas of the analysis, we consider a simple untyped call-by-value functional language. Starting with an operational semantics for the language, we develop an approximate “set-based” operational semantics, which formalizes the intuition of treating program variables as sets. The key result of the paper is an O ( n 3 ) algorithm for computing the set based approximation of a program. We then extend this analysis in a natural way to deal with arrays, arithmetic, exceptions and continuations. We briefly describe our experience with an implementation of this analysis for ML programs.
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