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The techniques used to implement (non-trivial) interprocedural data flow analyzers can be generally divided into two subsets: the call string approach and the functional approach as presented in [Sharir and Pnueli, 1981]. Both differ in time and space complexity as well as in precision due to properties of the abstract domains and transfer functions. We have developed a data flow analyzer generator PAG which is able to produce interprocedural analyzers for both techniques. We specified two variants of constant propagation working in an ANSI-C compiler; a copy constant propagation that uses distributive transfer function and can be solved precisely, even interprocedurally [Sagiv et al., 1995], and a full constant propagator which includes an interpreter for expressions of the language. We present the practical relevant results applying both analyzers to a fair set of real-world programs and compare the space/time consumption of the analyzers versus their precision.

Experimental Comparison of Call String and Functional Approaches to Interprocedural Analysis