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Conference Papers Year : 2023

HyperDiff: Computing Source Code Diffs at Scale

Abstract

With the advent of fast software evolution and multistage releases, temporal code analysis is becoming useful for various purposes. Temporal code analyses can consist in analyzing multiple Abstract Syntax Trees (ASTs) extracted from code evolutions, e.g. one AST for each commit or release. Core feature to temporal analysis is code differencing: the computation of the so-called Diff or edit script between two given versions of the code. However, jointly analyzing and computing the difference on thousands versions of code faces scalability issues. Mainly because of the cost of: 1) parsing the original and evolved code in two source and target ASTs; 2) wasting resources by not reusing intermediate computation results that can be shared between versions. This paper details a novel approach based on time-oriented data structures that makes code differencing scale up to large software codebases. In particular, we leverage on the HyperAST [25], a novel representation of code histories, to propose an incremental and memory efficient approach by lazifying the well known GumTree diffing algorithms [11], a mainstream code differencing algorithm and tool. We evaluated our approach on a curated list of 19 large software projects and compared it to GumTree. Our approach outperforms it in scalability both in time and memory. We observed an order-of-magnitude difference: 1) in CPU time from ×1.2 to ×12.7 for the total time of diff computation and up to ×226 in intermediate phases of the diff computation, and 2) in memory footprint of ×4.5 per AST node. The approach produced 99.3 % of identical diffs with respect to GumTree. CCS CONCEPTS • Software and its engineering → Software version control; Maintaining software.
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Dates and versions

hal-04189855 , version 1 (29-08-2023)

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Quentin Le Dilavrec, Djamel Eddine Khelladi, Arnaud Blouin, Jean-Marc Jézéquel. HyperDiff: Computing Source Code Diffs at Scale. ESEC/FSE 2023 - 31st ACM Joint European Software Engineering Conference and Symposium on the Foundations of Software Engineering, Dec 2023, San Francisco (CA, USA), United States. pp.1-12, ⟨10.1145/3611643.3616312⟩. ⟨hal-04189855⟩
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