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Parallelization and other optimizations often depend on static dependence analysis. This approach requires methods to be independent regardless of the input data, which is not always the case. Our contribution is a dynamic analysis "guessing" if methods are pure, i.e., if they do not change state. The analysis is piggybacking on a garbage collector, more specifically, a concurrent, replicating garbage collector. It guesses whether objects are immutable by looking at actual mutations observed bydoi:10.1145/2247684.2247694 dblp:conf/pldi/OsterlundL12 fatcat:mxktxrcsjrbbzg5tj4wjpzdyji