FUNCTION EXECUTION PRIORITIZATION

Methods, systems, and apparatus, including computer programs encoded on computer storage media, for assigning levels of priority to selected source code functions. One of the methods includes for each selected function, a respective associated first set of functions reachable from the selected function by at most N steps, and a respective associated second set of functions that are each reachable from the selected function by more than N steps and less than M steps are computed. A first partition having all selected functions whose respective associated first set of functions has at least one of the subject functions is computed. A second partition having selected functions not in the first partition and whose respective associated second set of functions has at least one of the subject functions is computed. Selected functions belonging to the first partition are assigned a higher priority than selected functions belonging to the second partition.