CFA2: a context-free approach to control-flow analysis

  • Authors:
  • Dimitrios Vardoulakis;Olin Shivers

  • Affiliations:
  • Northeastern University;Northeastern University

  • Venue:
  • ESOP'10 Proceedings of the 19th European conference on Programming Languages and Systems
  • Year:
  • 2010

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Abstract

In a functional language, the dominant control-flow mechanism is function call and return. Most higher-order flow analyses, including k-CFA, do not handle call and return well: they remember only a bounded number of pending calls because they approximate programs with control-flow graphs. Call/return mismatch introduces precision-degrading spurious control-flow paths and increases the analysis time. We describe CFA2, the first flow analysis with precise call/return matching in the presence of higher-order functions and tail calls. We formulate CFA2 as an abstract interpretation of programs in continuation passing style and describe a sound and complete summarization algorithm for our abstract semantics. A preliminary evaluation shows that CFA2 gives more accurate data-flow information than 0CFA and 1CFA.