Computing Dynamic Slices of Concurrent Feature-Oriented Programs

This paper proposes a dynamic slicing algorithm for concurrent feature-oriented programs. The algorithm is named concurrent feature-oriented node-marking dynamic slicing (CFNMDS) algorithm. The proposed dynamic slicing technique uses a dependence based intermediate representation named concurrent composite feature dependence graph (CCFDG). It is based on marking and unmarking of the executed nodes in CCFDG appropriately during runtime. Ten standard open source product lines have been taken to experiment the proposed CFNMDS algorithm. Jak codes and feature-oriented models have been developed for these product lines. The advantage of the proposed approach is that no trace file is used to store execution history of the program. Also, no extra nodes are created during runtime in the proposed approach. Creation of extra nodes leads to take more time for marking and unmarking process. Use of any extra file also leads to higher runtime overhead for input/output operations. This results in taking more time to compute the slices. So, it is necessary to compute dynamic slices in less time without using any trace file and extra nodes. Using the proposed approach, slices can be extracted in O(1) i.e., in constant time. The slice computation time for various combinations of features for each product line has also been measured.