Bubaak-SpLit: Split what you cannot verify (Competition contribution)

Bubaak-SpLit is a tool for dynamically splitting verification tasks into parts that can then be analyzed in parallel. It is built on top of Bubaak, a tool designed for running combinations of verifiers in parallel. In contrast to Bubaak, that directly invokes verifiers on the inputs, Bubaak-SpLit first starts by splitting the input program into multiple modified versions called program splits. During the splitting process, Bubaak-SpLit utilizes a weak verifier (in our case symbolic execution with a short timelimit) to analyze each generated program split. If the weak verifier fails on a program split, we split this program split again and start the verification process again on the generated program splits. We run the splitting process until a predefined number of hard-to-verify program splits is generated or a splitting limit is reached. During the main verification phase, we run a combination of Bubaak-Lee and Slowbeast in parallel on the remaining unsolved parts of the verification task.