Stack signature marking segments are inserted into re-entrant programming source code modules prior to compilation of the modules at each code module entry point and at each code module exit point, followed by producing one or more executable programs from the programming source code modules. Upon execution of instances of the executable programs, the inserted segments assign unique, non-duplicated module identifier values to the instances of the code modules, generate an instance count for each instantiation of executable code module in the stack signature for each object instance dynamically created during runtime of a re-entrant executable code module, and push onto a processing stack the module identifier values and the instance counts within stack frames allocated to each of the executable program instances.