WPDS Solver#839
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…ion (similar to how IterativeIDESolver approaches this)
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This PR adds a first version of a Weighted Pushdown Systems solver to phasar. It implements the post* algorithm, freely adapted from Algorithm 3 in "Weighted pushdown systems and their application to interprocedural dataflow analysis" by Reps et al. (link).
The new
WPDSSolvercan solve WPDS that are provided via awpds::RuleProvider. Existing IFDS/IDE problems can be transformed to a RuleProvider by using one of the the wrapper-typesIFDSRuleProviderorIDERuleProvider.Note that the solver does not eagerly compute the final edge-values (as IDE would do) as per Algorithm 4 in the paper. Instead we use an on-demand value computation. This fits better to the current data-layout of the P-Automaton (
wpds::SolverResults/wpds::OwningSolverResults). Let's see, how well it works.The whole WPDS infastructure should be treated as experimental for now.