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EdSketch: execution-driven sketching for Java

  • Jinru HuaEmail author
  • Yushan Zhang
  • Yuqun Zhang
  • Sarfraz Khurshid
SPIN 2017
  • 11 Downloads

Abstract

Sketching is a synthesis approach that allows users to provide high-level insights into a synthesis problem and let synthesis tools complete low-level details. Users write sketches—partial programs that have “holes” and provide test assertions as the correctness criteria. The sketching techniques fill the holes with code fragments such that the complete program satisfies all test assertions. Traditional techniques translate the sketching problem to propositional satisfiability formulas and leverage SAT solvers to generate programs with the desired functionality. While effective for a range of small well-defined domains, such translation-based approaches have a key limitation when applying to real applications: They require either translating all relevant libraries that are invoked directly or indirectly by the given sketch or creating models of those libraries, which requires much manual effort. This paper introduces execution-driven sketching, a novel approach for synthesizing Java programs with on-demand candidate generation. The key novelty of our work is to leverage runtime behavior to prune a large amount of search space. EdSketch explores the actual program behaviors in the presence of libraries and sketches small parts of real-world applications, which may use complex constructs of modern languages, such as reflection, native calls and File I/O. We further leverage a set of pruning strategies based on Java syntax to expedite the synthesis process. EdSketch embodies our approach in two forms: a stateful search based on the Java PathFinder model checker; and a stateless search based on re-execution inspired by the VeriSoft model checker. Experimental results show that EdSketch can complete some sketches that contain complex constructs in the presence of libraries, recursive procedures and advanced features like reflection. Without translating to SAT, EdSketch ’s performance compares well with the SAT-based Sketch system for a range of small but complex data structure subjects.

Keywords

Program sketching Execution-driven synthesis Backtracking search 

Notes

Acknowledgements

This work was funded in part by the National Science Foundation (NSF Grant Nos. CCF-1319688 and CNS-1239498), Shenzhen Peacock Plan (Grant No. KQT D2016112514355531), the Science and Technology Innovation Committee Foundation of Shenzhen (Grant No. JCYJ2017081 7110848086). We thank Mukul Prasad, Allison Sullivan and Kaiyuan Wang for discussion and comments.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Jinru Hua
    • 1
    Email author
  • Yushan Zhang
    • 2
  • Yuqun Zhang
    • 2
  • Sarfraz Khurshid
    • 1
  1. 1.The University of Texas at AustinAustinUSA
  2. 2.Southern University of Science and TechnologyShenzhenChina

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