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• W3134687771 abstract "Abstract syntax tree (AST) mapping algorithms are widely used to analyze changes in source code. Despite the foundational role of AST mapping algorithms, little effort has been made to evaluate the accuracy of AST mapping algorithms, i.e., the extent to which an algorihtm captures the evolution of code. We observe that a program element often has only one best-mapped program element. Based on this observation, we propose a hierarchical approach to automatically compare the similarity of mapped statements and tokens by different algorithms. By performing the comparison, we determine if each of the compared algorithms generates inaccurate mappings for a statement or its tokens. We invite 12 external experts to determine if three commonly used AST mapping algorithms generate accurate mappings for a statement and its tokens for 200 statements. Based on the experts' feedback,we observe that our approach achieves a precision of 0.98--1.00 and a recall of 0.65--0.75. Furthermore, we conduct a large-scale study with a dataset of ten Java projects, containing a total of 263,165 file revisions. Our approach determines that GumTree, MTDiff and IJM generate inaccurate mappings for 20%--29%, 25%--36% and 21%--30% of the file revisions, respectively. Our experimental results show that state-of-art AST mapping agorithms still need improvements." @default.
• W3134687771 created "2021-03-15" @default.
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• W3134687771 date "2021-02-27" @default.
• W3134687771 modified "2023-09-27" @default.
• W3134687771 title "A Differential Testing Approach for Evaluating Abstract Syntax Tree Mapping Algorithms" @default.
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• W3134687771 doi "https://doi.org/10.48550/arxiv.2103.00141" @default.
• W3134687771 hasPublicationYear "2021" @default.
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