
Departmental Papers (CIS)
Date of this Version
July 2003
Document Type
Conference Paper
Recommended Citation
Rajeev Alur, Salvatore La Torre, and P. Madhusudan, "Modular Strategies for Infinite Games on Recursive Graphs", Lecture Notes in Computer Science: Computer Aided Verification 2725, 67-79. July 2003. http://dx.doi.org/10.1007/978-3-540-45069-6_6
Abstract
In this paper, we focus on solving games in recursive game graphs that can model the control flow of sequential programs with recursive procedure calls. The winning condition is given as an ω-regular specification over the observable, and, unlike traditional pushdown games, the strategy is required to be modular: resolution of choices within a component should not depend on the context in which the component is invoked, but only on the history within the current invocation of the component. We first consider the case when the specification is given as a deterministic Büchi automaton. We show the problem to be decidable, and present a solution based on two-way alternating tree automata with time complexity that is polynomial in the number of internal nodes, exponential in the specification and exponential in the number of exits of the components. We show that the problem is EXPTIME-complete in general, and NP-complete for fixed-size specifications. Then, we show that the same complexity bounds apply if the specification is given as a universal co-Büchi automaton. Finally, for specifications given as formulas of linear temporal logic LTL, we obtain a synthesis algorithm that is doubly-exponential in the formula and singly exponential in the number of exits of components.
Subject Area
CPS Theory
Publication Source
Lecture Notes in Computer Science: Computer Aided Verification
Volume
2725
Start Page
67
Last Page
79
DOI
10.1007/978-3-540-45069-6_6
Copyright/Permission Statement
The original publication is available at www.springerlink.com
Date Posted: 29 November 2005
Comments
From the 15th International Conference, CAV 2003, Boulder, CO, USA, July 8-12, 2003.