NDLI: Abstract semantic differencing via speculative correlation

Content Provider	ACM Digital Library
Author	Partush, Nimrod Yahav, Eran
Abstract	We address the problem of computing semantic differences between a program and a patched version of the program. Our goal is to obtain a precise characterization of the difference between program versions, or establish their equivalence. We focus on infinite-state numerical programs, and use abstract interpretation to compute an over-approximation of program differences. Computing differences and establishing equivalence under abstraction requires abstracting relationships between variables in the two programs. Towards that end, we use a correlating abstract domain to compute a sound approximation of these relationships which captures semantic difference. This approximation can be computed over any interleaving of the two programs. However, the choice of interleaving can significantly affect precision. We present a speculative search algorithm that aims to find an interleaving of the two programs with minimal abstract semantic difference. This method is unique as it allows the analysis to dynamically alternate between several interleavings. We have implemented our approach and applied it to real-world examples including patches from Git, GNU Coreutils, as well as a few handpicked patches from the Linux kernel and the Mozilla Firefox web browser. Our evaluation shows that we compute precise approximations of semantic differences, and report few false differences.
Starting Page	811
Ending Page	828
Page Count	18
File Format	PDF
ISSN	03621340 15581160
DOI	10.1145/2714064.2660245
Journal	ACM SIGPLAN Notices (SIGP)
Volume Number	49
Issue Number	10
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	1983-05-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Differential analysis Abstract interpretation Equivalence checking Numerical domains Semantic diff Patches
Content Type	Text
Resource Type	Article
Subject	Computer Graphics and Computer-Aided Design Software

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