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OSDI '04 — Abstract
Pp. 289–302 of the Proceedings
CP-Miner: A Tool for Finding Copy-paste and Related Bugs in Operating System Code
Zhenmin Li, Shan Lu, Suvda Myagmar, and Yuanyuan Zhou, University of Illinois at Urbana-Champaign
Abstract
Copy-pasted code is very common in large software because programmers
prefer reusing code via copy-paste in order to reduce programming
effort. Recent studies show that copy-paste is prone to introducing
bugs and a significant portion of operating system bugs concentrate in
copy-pasted code. Unfortunately, it is challenging to efficiently
identify copy-pasted code in large software. Existing copy-paste
detection tools are either not scalable to large software, or cannot
handle small modifications in copy-pasted code. Furthermore, few
tools are available to detect copy-paste related bugs.
In this paper we propose a tool, CP-Miner, that uses data mining
techniques to efficiently identify copy-pasted code in large software
including operating systems, and detects copy-paste related bugs.
Specifically, it takes less than 20 minutes for CP-Miner to identify
190,000 copy-pasted segments in Linux and 150,000 in FreeBSD.
Moreover, CP-Miner has detected 28 copy-paste related bugs in the
latest version of Linux and 23 in FreeBSD. In addition, we analyze
some interesting characteristics of copy-paste in Linux and FreeBSD,
including the distribution of copy-pasted code across different
length, granularity, modules, degrees of modification, and various
software versions.
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