Revisiting Underapproximate Reachability for Multipushdown Systems [chapter]

S. Akshay, Paul Gastin, S Krishna, Sparsa Roychowdhury
2020 Lecture Notes in Computer Science  
Boolean programs with multiple recursive threads can be captured as pushdown automata with multiple stacks. This model is Turing complete, and hence, one is often interested in analyzing a restricted class that still captures useful behaviors. In this paper, we propose a new class of bounded underapproximations for multi-pushdown systems, which subsumes most existing classes. We develop an efficient algorithm for solving the under-approximate reachability problem, which is based on efficient
more » ... -point computations. We implement it in our tool BHIM and illustrate its applicability by generating a set of relevant benchmarks and examining its performance. As an additional takeaway BHIM solves the binary reachability problem in pushdown automata. To show the versatility of our approach, we then extend our algorithm to the timed setting and provide the first implementation that can handle timed multipushdown automata with closed guards.
doi:10.1007/978-3-030-45190-5_21 fatcat:vxpjfdfbvja3xnd54mkfkcajj4