Interprocedural Reachability for Flat Integer Programs

Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 9210)


We study programs with integer data, procedure calls and arbitrary call graphs. We show that, whenever the guards and updates are given by octagonal relations, the reachability problem along control flow paths within some language \(w_1^* \ldots w_d^*\) over program statements is decidable in Nexptime. To achieve this upper bound, we combine a program transformation into the same class of programs but without procedures, with an Np-completeness result for the reachability problem of procedure-less programs. Besides the program, the expression \(w_1^* \ldots w_d^*\) is also mapped onto an expression of a similar form but this time over the transformed program statements. Several arguments involving context-free grammars and their generative process enable us to give tight bounds on the size of the resulting expression. The currently existing gap between Np-hard and Nexptime can be closed to Np-complete when a certain parameter of the analysis is assumed to be constant.


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Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  1. 1.IMDEA Software InstituteMadridSpain
  2. 2.CNRS/VERIMAGGrenobleFrance

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