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## Boolean Algebra of Shape Analysis Constraints

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### Abstract

The parametric shape analysis framework of Sagiv, Reps, and Wilhelm [45, 46] uses three-valued structures as dataflow lattice elements to represent sets of states at different program points. The recent work of Yorsh, Reps, Sagiv, Wilhelm [48, 50] introduces a family of formulas in (classical, two-valued) logic that are isomorphic to three-valued structures [46] and represent the same sets of concrete states.
In this paper we introduce a larger syntactic class of formulas that has the same expressive power as the formulas in [48]. The formulas in [48] can be viewed as a normal form of the formulas in our syntactic class; we give an algorithm for transforming our formulas to this normal form. Our formulas make it obvious that the constraints are closed under all boolean operations and therefore form a boolean algebra. Our algorithm also gives a reduction of the entailment and the equivalence problems for these constraints to the satisfiability problem.

### Citation

Viktor Kuncak and Martin Rinard.
Boolean algebra of shape analysis constraints.
In *Verification, Model Checking and Abstract Interpretation*,
volume 2937 of *LNCS*, 2004.### BibTex Entry

@INPROCEEDINGS{KuncakRinard04BooleanAlgebraShapeAnalysisConstraints,
author = {Viktor Kuncak and Martin Rinard},
title = {Boolean Algebra of Shape Analysis Constraints},
booktitle = {Verification, Model Checking and Abstract Interpretation},
series = {LNCS},
volume = {2937},
year = 2004,
localurl = {http://lara.epfl.ch/~kuncak/papers/KuncakRinard04BooleanAlgebraShapeAnalysisConstraints.pdf}
}

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