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During last years, researches have proposed novel repair approaches thatautomatically generate patches for repairing software bugs. Repair approachescan be loosely characterized along the main design philosophy such generate-and-validate or synthesis-based. Each of those repair approaches is a point inthe design space of program repair. Our goal is to facilitate the design,development and evaluation of repair approaches by providing a framework that:a) contains components commonly present in approaches implementations thus newapproaches can be built over them, b) provides built-in implementations ofexisting repair approach. This paper presents a framework named Astor thatencores the design space of generate-and-validate repair approaches. Astorprovides extension points that form the explicit decision space of programrepair. Over those extension points, researchers can reuse existing componentsor implements new ones. Astor includes 6 Java implementation of repairapproaches, including one of the pioneer: GenProg. Researcher have been alreadydefining new approaches over Astor, proposing improvements of those built-inapproaches by using the extension points, and executing approachesimplementations from Astor in their evaluations. The implementations of therepair approaches built over Astor are capable of repair, in total, 98 realbugs from 5 large Java programs.

Astor: Exploring the Design Space of Generate-and-Validate Program Repair beyond GenProg