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Steering Clear of Triples: Deriving the Control Flow Graph Directly from the Abstract Syntax Tree in C Programs

This article explores the extension of Morgenthaler''s Virtual Control Flow technique, which derives control flow semantics directly from the Abstract Syntax Tree, from the relatively coarse granularity of syntactic C expressions to the finer granularity of basic block expressions, that is, expressions without embedded control flow. We explain why this is a better level of abstraction for program analysis, and discuss the elements of an efficient and elegant solution, motivating the presentation by appealing to a more explicit intermediate form. We present our algorithm, and conclude with remarks about the suitability of Morgenthaler''s version of Virtual Control Flow for customary exhaustive data-flow analysis.