REFACTORING OF C/C plus plus PREPROCESSOR CONSTRUCTS AT THE MODEL LEVEL

Preprocessor directives are usually omitted from the analysis of C/C++ software, yet they play an important role especially in program transformations. Here a method is presented for refactoring preprocessor constructs at the model level. Refactorings are carried out on program models derived from a reverse engineering process of real-life software. We present a metamodel of preprocessing on which a graph transformation approach is used to elaborate refactorings. The method is presented through the elaboration of the add parameter refactoring both at schematic and concrete level. Safe transformations are assured by visual control and validated by the evaluation of OCL expressions. The usability of the idea is validated by successful experiments.