An Appendix for "Studying the life expectancy of clone genealogies"

Patanamon Thongtanunam · Weiyi Shang · Ahmed E. Hassan Under review

Replication Package

Tools

This study uses the following tools:

1. iClones: http://www.softwareclones.org/iclones.php
2. Understand: https://scitools.com/features/
3. Kenja Historage: https://github.com/niyaton/kenja/

Scripts

1. extractVersions.sh

   • This script downloads the source files (only .java) of each release from Git and store them in the <project>_versions/ directory. Each directory is for one release. The directory name is created to be consistent with the lexicographically sorting.
   • This script also creates the changes file (i.e., change information that iClones need) in the directory of each release.
   • This script also provide a list of commits that associate with each release
     • Output : Java source files in each version in <project>_versions/ and <project>.tag_commits.csv
   • iClones will detect clone genealogies using files and versions in the <project>_versions/ directory and produce an RCF file.

2. classifier_experiment.R

   • This script run an experiment for our classifiers using random forest, SVN, or logistic regression techniques.
   • This script also measure the performance of classifiers (i.e., AUC, true positive, and false positive) while using the out-of-sample bootstrap validation technique.
   • The set of variable importance are also exported.

Clone Genealogies

The clone genealogies in RCF files in this work can be visualized using the cyclone tool (http://www.softwareclones.org/cyclone.php). Below is an example of clone genealogies in Ant.