Abstract

Code segments are similar or identical to each other by copy-paste the original code at different locations with or without modifications are called code clones. Code clones are either by intentional or unintentional. In software development reprocess, the original code is most common. If any bug exists in original code segment, the bug remains in all the cloned code. As a result, bug propagation in cloning process affects in software maintenance. Detection and corrections are required. Code clone detection appears as an ongoing research area to solve these issues. In this paper, we carried out literature survey of 43 studies to summarize techniques and tools utilized for code clone detection. Six code clone detection techniques are based on text, token, tree, metric, graph, and hybrid to detect type-1, type-2, type-3, and type-4 clones. Our study is concluded with several studies that exist to detect the types 1–4 clones. There is a requirement of novel approach to develop to detect all four types of clones together. In addition, need to develop more approaches to simplify to create program dependency graph for type-4 clone detection.

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