Project Team Regal

Overall Objectives
Scientific Foundations
Application Domains
New Results
Partnerships and Cooperations
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Section: Software


Participants : Julia Lawall [correspondent] , Gilles Muller [correspondent] , Gaël Thomas, Suman Saha, Arie Middlekoop.

Coccinelle is a program matching and transformation engine which provides the language SmPL (Semantic Patch Language) for specifying desired matches and transformations in C code. Coccinelle was initially targeted towards performing collateral evolutions in Linux. Such evolutions comprise the changes that are needed in client code in response to evolutions in library APIs, and may include modifications such as renaming a function, adding a function argument whose value is somehow context-dependent, and reorganizing a data structure.

Beyond collateral evolutions, Coccinelle has been successfully used for finding and fixing bugs in systems code. One of the main recent results is an extensive study of bugs in Linux 2.6 [51] that has permitted us to demonstrate that the quality of code has been improving over the last six years, even though the code size has more than doubled.