Departmental Papers (CIS)

Document Type

Conference Paper

Subject Area

CPS Theory

Date of this Version

July 2003

Publication Title

Lecture Notes in Computer Science: Computer Aided Verification

Volume

2725

First Page

67

Last Page

79

DOI

10.1007/978-3-540-45069-6_6

Comments

From the 15th International Conference, CAV 2003, Boulder, CO, USA, July 8-12, 2003.

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.

Permission Statement

The original publication is available at www.springerlink.com

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Date Posted: 29 November 2005