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A Framework for Studying
Clones In Large Software
Systems
Jack ZhenMing Jiang
Ahmed E. Hassan
Oct. 1st, 2007
What is a clone?
• Identical or similar segments of code
6/25/2015 2SCAM 2007
Clone Representations
Clone Pairs Clone Classes
6/25/2015 3SCAM 2007
Not So Useful Clones
6/25/2015 4SCAM 2007
Evolution of Code Clones
6/25/2015 5SCAM 2007
Problems With Clone Detection
Output
• Too many clone candidates
– Many not useful clones
• Hard to get a high level view of code cloning
– Cloning at the architecture level
6/25/2015 6SCAM 2007
Visualization
6/25/2015 7SCAM 2007
Interesting Results
• Pattern
• Anti-pattern
6/25/2015 8SCAM 2007
Conclusion
6/25/2015 9SCAM 2007
Questions
6/25/2015 10SCAM 2007
Thought Provoking Statements
• One Question
– What are clones? Is its definition task dependent (tasks
also restrains the clone detection mechanisms)?
• Bug Fixes (similar semantics)
• Knowledge Transfer (developers’ copy-and-paste)
• Program Comprehension or Architecture Recovery (similar code
structure)
• One Analogy:
– Design level similarities are called design patterns. A good
design involves with metrics like “High Cohesion and Low
Coupling”
– Code level similarities are called clones. How do we
measure whether it is a good clone or a “harmful” clones?
6/25/2015 11SCAM 2007

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Scam2007 jiang