MEASURING CODE COVERAGE

A facility for measuring code coverage of an executable object is described. The facility requests an identification of basic blocks of the executable object, adds a data structure to the executable object for storing code coverage information, and adds to each basic block of the executable object program instructions for updating an element of the data structure corresponding to the basic block. When the executable object performs, each basic block that is performed updates an element of the added data structure corresponding to the basic block. When the executable object terminates, it updates a file comprising an indication of basic blocks that have been performed.