The Last Line Effect
Jun. 11, 2015•0 likes•1,237 views
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Micro-clones are tiny duplicated pieces of code; they typically comprise only a few statements or lines. In this paper, we expose the “last line effect,” the phenomenon that the last line or statement in a micro-clone is much more likely to contain an error than the previous lines or statements. We do this by analyzing 208 open source projects and reporting on 202 faulty micro-clones
Moritz BellerFollow
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The Last Line Effect
- 1. The Last Line Effect Moritz Beller @Inventitech Andy Zaidman Andrey Karpov
- 2. TrinityCore Example Last Line Effect
- 3. TrinityCore Example Last Line Effect
- 4. TrinityCore Example Last Line Effect
- 5. Chromium Example Last Statement Effect
- 6. Chromium Example Last Statement Effect
- 7. Chromium Example Last Statement Effect
- 8. Chromium Example Last Statement Effect
- 9. Chromium Example Last Statement Effect
- 10. Chromium Example
- 11. Chromium Example
- 12. Chromium Example
- 13. Chromium Example
- 14. Chromium Example
- 15. Chromium Example
- 20. Chromium Example Clone Class AST-Node 1 2 3 1
- 21. Chromium Example Clone Class AST-Node 1 2 3 4 1
- 22. Chromium Example Clone Class AST-Node 1 2 3 4 5 1
- 23. Chromium Example Clone Class AST-Node 1 2 3 4 5 1
- 24. Chromium Example Clone Class AST-Node 1 2 3 4 5 1 Type 2 Clone: “syntactically identical cop[ies]; only variable, type, or function identifiers have […] changed.” Koschke, 2007.
- 25. Chromium Example Clone Class AST-Node 1 2 3 4 5 1 Type 2 Clone: “syntactically identical cop[ies]; only variable, type, or function identifiers have […] changed.” Koschke, 2007. Very Short Type 2-Clone: Micro-Clone
- 32. Shortcut: Identical Subexpressions Shortcut to Faulty Micro-Clones
- 34. PVS-Studio
- 35. PVS-Studio
- 39. 208 OSS projectsPVS-Studio 202 Faulty Micro-Clones
- 40. 208 OSS projectsPVS-Studio 202 Faulty Micro-Clones
- 41. Error Distribution for Micro-Clones > 1 Line
- 42. Error Distribution for Micro-Clones Within 1 Line
- 43. What We Do Not Know (Yet) ...
- 44. ● Why did we find so few faulty micro-clones? What We Do Not Know (Yet) ...
- 45. ● Why did we find so few faulty micro-clones? What We Do Not Know (Yet) ...
- 46. ● Why did we find so few faulty micro-clones? What We Do Not Know (Yet) ...
- 47. ● Why did we find so few faulty micro-clones? What We Do Not Know (Yet) ... ● Are faulty micro-clones common among micro-clones?
- 48. ● Why did we find so few faulty micro-clones? What We Do Not Know (Yet) ... ● Are faulty micro-clones common among micro-clones?
- 49. ● Why did we find so few faulty micro-clones? What We Do Not Know (Yet) ... ● Are faulty micro-clones common among micro-clones?
- 50. ● Why did we find so few faulty micro-clones? What We Do Not Know (Yet) ... ● Are faulty micro-clones common among micro-clones? ● How are micro-clones created and evolved?
- 51. ● Why did we find so few faulty micro-clones? What We Do Not Know (Yet) ... ● Are faulty micro-clones common among micro-clones? ● How are micro-clones created and evolved?
- 52. @Inventitech Moritz Beller, TU Delft The Last Line Effect
- 53. @Inventitech Moritz Beller, TU Delft The Last Line Effect
- 54. @Inventitech Moritz Beller, TU Delft The Last Line Effect
- 55. @Inventitech Moritz Beller, TU Delft The Last Line Effect > code.|