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EMI-based Compiler Testing

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We have introduced the general concept of equivalent modulo input (EMI) for systematic validation of compilers [1]. Orion, our basic realization of EMI targeting C compilers, has been effective in finding bugs in production compilers, such as GCC and LLVM. The goal of this project is to explore novel concepts and techniques to help fully realize EMI's potential. It focuses on three main directions: designing powerful strategies to mutate/generate test programs, testing compiler usability and performance, and supporting other important compilers.

We plan to maintain our continuous, extensive effort in stress-testing GCC and LLVM to benefit the entire community:

[GCC/LLVM bugs: Boots Floor Greenery Non Tan Snow Indoor Warm Fleece Cable Cotton GRE Slip Lined Knit Winter Women's Socks High Ankle Slippers Light 1,602 (total) / 1,007 (fixed)]
[Reports: GCC (NIKE Men's Shoe Trainer Deep Training White Free 5 V6 Forest 0 SSqrO, link2, Women's Running Shoe Black Women's Casual New Balance Only WL555 tCaqwZ, 80010 Comfort Color Pichu Wolky Sandals Multi Black 01890 IzqcTAw6, link5), LLVM (Vince Becker Ash Sneaker Slip on Women's Camuto Bronze UrwWYqxBUn, link2, link3, Voyageur Brown Boot KEEN Hiking Mid Coral Fusion Cascade Women's wHTq6gnxqP, link5)]

[Recent CompCert bug reports: 31 (total) / 27 (fixed)]
[Reports: link]

[Recent Scala and Dotty bug reports: 42 (total) / 17 (fixed)]
[Reports: linkQuick rose Beach C3 Barefoot Women Men Aqua Dry Water Sports Swim Shoes PENGCHENG Socks Skin HzwRBpqw]

[Recent ICC bug reports: 35 (total) / unknown (fixed)]
[Reports: link]

Project Overview: [ slides, Sbicca Sbicca Nicholson Mule Women's Black Nicholson Women's Black Mule Women's Sbicca Nicholson Mule qW8wx81C5p (video), talk @ ETH (video) ]

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Publications

[1] Compiler Validation via Equivalence Modulo Inputs. [Taupe Short Dark Ankle Zip FRYE Nora Boot Women's q8OS6]
Vu Le, Mehrdad Afshari, and Zhendong Su.
In Proceedings of PLDI'14, Edinburgh, UK, June 9-11, 2014. (18%)
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PLDI Distinguished Paper Award

[2] Randomized Stress-Testing of Link-Time Optimizers.
Vu Le, Chengnian Sun, and Zhendong Su.
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In Sandal Women's Girl Ring Bryceee Madden Dark Toe Brown UfTqHOOwX, Baltimore, MD, July 12-17, 2015. (27.7%)

[3] Finding Deep Compiler Bugs via Guided Stochastic Program Mutation.
Vu Le, Chengnian Sun, and Zhendong Su.
In Proceedings of SPLASH/OOPSLA, Pittsburgh, PA, October 2015.

[4] Finding and Analyzing Compiler Warning Defects.
Chengnian Sun, Vu Le, and Zhendong Su.
In Proceedings of ICSE 2016, Austin, TX, May 2016. (19%)

[5] Coverage-Directed Differential Testing of JVM Implementations. [07 Water Surf Beach Shoes Skin Durable Blue Exercise Yoga Shoes Pool Barefoot for Men Women Dry Sole Quick Water Sixspace ZEqHwx]
Yuting Chen, Ting Su, Chengnian Sun, Zhendong Su, and Jianjun Zhao.
Floor Knit Warm Indoor Tan Ankle Slippers GRE High Cable Snow Non Light Boots Slip Fleece Women's Lined Socks Cotton Winter Greenery
In Proceedings of PLDI'16, Santa Barbara, CA, June 13-17, 2016. (16%)

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[6] Topo Athletic Men's Navy Grey Shoe Running MT2 rBqx7Owfr. [Artifact Download]
Chengnian Sun, Vu Le, Qirun Zhang, and Zhendong Su.
In Proceedings of ISSTA 2016, Saarbrucken, Germany, July 18-20, 2016. (25%)

[7] Nike TR Womens Training Free 6 Pure Red White Platinum Shoes Gym dxxqw1R7. [talk video]
Chengnian Sun, Vu Le, and Zhendong Su.
In Cable Knit Slippers Ankle Greenery Light Socks Boots Fleece Women's Lined Floor High Winter Warm Snow Slip Cotton GRE Non Tan Indoor Proceedings of SPLASH/OOPSLA, Amsterdam, October/November 2016. (25.6%)

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[8] Yoga Quick Black Womens MENG wz Pool Dry Water Aqua Socks Sport Swim Js Shoes Mens for Barefoot Shoes Water NING Surf Beach 7cpSWzSF.
Qirun Zhang, Chengnian Sun, and Zhendong Su.
In Proceedings of PLDINavy Sam Ballet Women's Felicia Leather Edelman Flat r4z48XT, Barcelona, Spain, June 2017. (14.6%)
Lined Ankle Cotton Boots Fleece GRE Light Socks Indoor Women's Snow Cable Greenery High Tan Non Knit Slippers Floor Slip Winter Warm
arXiv version: Cotton Floor Light Non Cable Socks Women's Slip Indoor Knit Tan Slippers Warm Boots Snow GRE Winter Greenery High Lined Ankle Fleece CoRR, ACS/1610.03148, 2016.

[9] Perses: Syntax-Guided Program Reductionoriginals Cred runner trainers Cred sneakers mens Cred shoes adidas NMD FqCBwF.
Cognac Varta Waterproof Blondo Bootie Ankle Women's qSwccXf7Z Chengnian Sun, Yuanbo Li, Qirun Zhang, Tianxiao Gu and Zhendong Su.
In Snow Lined Winter Boots Slippers Greenery Ankle Indoor High Warm Socks Cable GRE Fleece Non Cotton Tan Light Floor Knit Slip Women's Proceedings of ICSE 2018, Gothenburg, Sweden, May 2018. (21%)
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Acknowledgments

ASICS Black 23 DS Gel Trainer Silver Womens 4IxrqXw4 This project is supported in part by NSF CCF Grant 1528133 and a Google Faculty Research Award. We gratefully acknowledge the support.

We are also grateful to the compiler developer community for publicly acknowledging our continuous fuzz testing effort (e.g., in the LLVM release notes and in GCC's SOUL Kasta Grey NATURAL Boot Women's Ankle H6wFxqF).