An Empirical Study Of Function Clones In Open Source Software

An Empirical Study of Function Clones in Open Source Software Chnchal K.Roy and James R. Cordy Queen’s University Presenter: MF Khan

Outline ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Introduction ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Introduction (Cont) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

NICAD Overview ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

NICAD Overview ,[object Object],[object Object],[object Object],[object Object],[object Object]

Experimental Setup ,[object Object],[object Object]

Experimental Setup ,[object Object]

Clone Definition ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Validation of Clones ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Metrics and Visualizations ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Metrics and Visualizations ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Experimental Results 1.More function cloning in Open Source java than in C. On AvG about 15%(7.2% wrt LOC) 2.Effect of increasing UPI is almost identical.

Detail Overview 1.Several of C system have <10% cloning function. Java systems are consistent in cloning

Clone Associated Files ,[object Object],[object Object]

Profiles of Cloning Density ,[object Object],That’s mean Scattered File and more near miss clones

Profile of cloning Density Assuming that cloned method in high density cloned file have been intentionally copy/Pasted.

Profile Cloning Localization Location of a clone pair is a factor in s/w maintenance Except Linux there are no exact clone in (UPI threshold 0.0) in C When UPI threshold is 0.3,On average 45.9 %(49.0 % LOC) of clone pair in C Occur.

Conclusion ,[object Object],[object Object],[object Object]

Discussion ,[object Object],[object Object],[object Object],[object Object],[object Object]

An Empirical Study Of Function Clones In Open Source Software

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