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Program repair as sound optimization of broken programs

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We present a new, semantics-based approach to mechanical program repair where the intended meaning of broken programs (i.e., programs that may abort under a given, error-admitting language semantics) can be defined by a special, error-compensating semantics. Program repair can then become a compile-time, mechanical program transformation based on a program analysis. It turns a given program into one whose evaluations under the error-admitting semantics agree with those of the given program under the error-compensating semantics. We present the analysis and transformation as a type system with a transformation component, following the type-systematic approach to program optimization from our earlier work. The type-systematic method allows for simple soundness proofs of the repairs, based on a relational interpretation of the type system, as well as mechanical transformability of program correctness proofs between the Hoare logics for the error-compensating and error-admitting semantics. We first demonstrate our approach on the repair of file-handling programs with missing or superfluous open and close statements. Our framework shows that this repair is strikingly similar to partial redundancy elimination optimization commonly used by compilers. In a second example, we demonstrate the repair of programs operating a queue that can over- and underflow, including mechanical transformation of program correctness proofs.

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Fischer, B., Saabas, A. and Uustalu, T. (2009) Program repair as sound optimization of broken programs 2009 Third IEEE International Symposium on Theoretical Aspects of Software Engineering (TASE), 165-73|xiii+333.

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Published date: 2009
Additional Information: Imported from ISI Web of Science
Organisations: Electronic & Software Systems


Local EPrints ID: 270197
PURE UUID: 9869a564-2ede-4ad7-9229-b813a3055737

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Date deposited: 21 Apr 2010 07:46
Last modified: 18 Jul 2017 06:51

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Author: B. Fischer
Author: A. Saabas
Author: T. Uustalu

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