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Are the clients of flawed classes (also) defect prone?

Are the clients of flawed classes (also) defect prone?

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11th ieee International working conference on source code analysis and manipulation/ieee International conference on Software Maintenance/ieee International Symposium on Web Systems Evolution/VISSOFT/MESOCA

作者： Marinescu, Radu Marinescu, Cristina Politehn Univ Timisoara LOOSE Res Grp Timisoara Romania

ISBN: (纸本)9780769543475

Design flaws are those characteristics of design entities (e.g., methods, classes) which make them harder to maintain. Existing studies show that classes revealing particular design flaws are more change and defect prone than the other classes. Since various collaborations are found among the instances of classes, classes are not isolated within the source code of object-oriented systems. In this paper we investigate if classes using classes revealing design flaws are more defect prone than classes which do not use classes revealing design flaws. We detect four design flaws in three releases of Eclipse and investigate the relation between classes that use/do not use flawed classes and defects. The results show that classes that use flawed classes are defect prone and this does not depend on the number of the used flawed classes. This findings show a new type of correlation between design flaws and defects, bringing evidence related to an increased likelihood of exhibiting defects for classes that use classes revealing design flaws. Based on the provided evidence, practitioners are advised once again about the negative impact design flaws have at a source code level.

关键词： source code defects design flaws detection strategies software repositories empirical software engineering

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Bit-Level Taint analysis 14

Bit-Level Taint Analysis

引用

14th ieee International working conference on source code analysis and manipulation (SCAM)

作者： Yadegari, Babak Debray, Saumya Univ Arizona Dept Comp Sci Tucson AZ 85721 USA

ISBN: (纸本)9780769553047

Taint analysis has a wide variety of applications in software analysis, making the precision of taint analysis an important consideration. Current taint analysis algorithms, including previous work on bit-precise taint analyses, suffer from shortcomings that can lead to significant loss of precision (under/over tainting) in some situations. This paper discusses these limitations of existing taint analysis algorithms, shows how they can lead to imprecise taint propagation, and proposes a generalization of current bit-level taint analysis techniques to address these problems and improve their precision. Experiments using a deobfuscation tool indicate that our enhanced taint analysis algorithm leads to significant improvements in the quality of deobfuscation.

关键词： data flow analysis bit-level taint analysis bit-precise taint analysis deobfuscation tool software analysis taint analysis algorithms taint propagation Algorithm design and analysis Data handling Heuristic algorithms Performance analysis Registers Semantics Standards Program Understanding Reverse Engineering Taint analysis Reverse engineering Taints Algorithm design and analysis data flow analysis data processing Registers Heuristic algorithms Semantics

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Checking Refactoring Detection Results Using code Changes Encoding for Improved Accuracy 22

Checking Refactoring Detection Results Using Code Changes En...

引用

ieee 22nd International working conference on source code analysis and manipulation (SCAM)

作者： Tan, Liang Bockisch, Christoph Philipps Univ Marburg Marburg Germany

ISBN: (纸本)9781665496094

For example during software maintenance, it is often important to know the reason for a code change and therefore tools are researched to automatically detect changes due to refactorings. The tool RefDiff can achieve this supporting multiple programming languages. It provides a good precision, but at the cost of a large number of false negative results due to the necessary use of a high threshold in refactoring candidate selection. We have created a result checker that improves the overall performance of RefDiff by including more candidates and reducing false positives from RefDiff detection results afterwards. The checker encodes the textual differences (so-called diffs) corresponding to the results and uses machine learning to predict the contained refactoring type. The main contribution of this paper is the approach for extracting the diffs from the detection results and encoding them as image data for machine learning processing, as well as the training of the machine learning algorithm. We have shown that lowering the candidate threshold in conjunction with the checker improves not only the recall of RefDiff, also the precision is increased. Our approach improves the RefDiff detection results to 99.5% precision and 95.2% recall.

关键词： refactoring detection diff features encoding

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Detecting Function Purity in JavaScript 15

Detecting Function Purity in JavaScript

引用

15th ieee International working conference on source code analysis and manipulation (SCAM)

作者： Nicolay, Jens Noguera, Carlos De Roover, Coen De Meuter, Wolfgang Vrije Univ Brussel Software Languages Lab Brussels Belgium

ISBN: (纸本)9781467375290

We present an approach to detect function purity in JavaScript. A function is pure if none of its applications cause observable side-effects. The approach is based on a pushdown flow analysis that besides traditional control and value flow also keeps track of write effects. To increase the precision of our purity analysis, we combine it with an intraprocedural analysis to determine freshness of variables and object references. We formalize the core aspects of our analysis, and discuss our implementation used to analyze several common JavaScript benchmarks. Experiments show that our technique is capable of detecting function purity, even in the presence of higher-order functions, dynamic property expressions, and prototypal inheritance.

关键词： Java program diagnostics JavaScript function purity detection pushdown flow analysis Arrays Benchmark testing Context Reactive power Resource management Semantics Standards analysis programme Benchmark testing Reactive power management of resources Semantics Java Script Java Java programming language purity arrays semiotics Flow analysis

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First Steps towards a Methodology for Unified Graph's Discrepancy analysis 22

First Steps towards a Methodology for Unified Graph's Discre...

引用

ieee 22nd International working conference on source code analysis and manipulation (SCAM)

作者： Balogh, Gergo Barath, Istvan Univ Szeged Dept Software Engn Dugon Ter 13 Szeged Hungary

ISBN: (纸本)9781665496094

Researchers and IT professionals frequently use dataset comparison during software analysis. Additionally, they commonly make judgments based on discrepancies between two representations of the same item's set. To locate the errorprone areas of the system, developers may evaluate the densely linked regions of method call graphs in the context of their position in the package hierarchy tree. A universal technique for graphs, which can be utilized to unify the underlying process of discrepancy analysis, might help with these types of analyses. In this paper, we present a methodology for unified graph's discrepancy analysis, named UNIGDA. Its foundation is the previously established domain-specific discrepancy identification approach for cluster comparison. But to capture the similarity structures between the vertices of arbitrary graphs, we use several kinds of characteristic functions.

关键词： graph comparison discrepancy analysis unified methodology similarity software analysis software comparison

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Validating the Use of Topic Models for Software Evolution

Validating the Use of Topic Models for Software Evolution

引用

10th ieee working conference on source code analysis and manipulation (SCAM)

作者： Thomas, Stephen W. Adams, Bram Hassan, Ahmed E. Blostein, Dorothea Queens Univ Sch Comp SAIL Kingston ON Canada

ISBN: (纸本)9780769541785

Topics are collections of words that co-occur frequently in a text corpus. Topics have been found to be effective tools for describing the major themes spanning a corpus. Using such topics to describe the evolution of a software system's source code promises to be extremely useful for development tasks such as maintenance and re-engineering. However, no one has yet examined whether these automatically discovered topics accurately describe the evolution of source code, and thus it is not clear whether topic models are a suitable tool for this task. In this paper, we take a first step towards determining the suitability of topic models in the analysis of software evolution by performing a qualitative case study on 12 releases of JHotDraw, a well studied and documented system. We define and compute various metrics on the identified topics and manually investigate how the metrics evolve over time. We find that topic evolutions are characterizable through spikes and drops in their metric values, and that the large majority of these spikes and drops are indeed caused by actual change activity in the source code. We are thus encouraged by the use of topic models as a tool for analyzing the evolution of software.

关键词： JHot draw system Software evolution latent Dirichlet allocation software evolution software maintenance software maintenance software metrics software re-engineering source code evolution statistical analysis topic drops topic evolutions topic modeling topic models topic spikes

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SimNav: Simulink Navigation of Model Clone Classes 15

SimNav: Simulink Navigation of Model Clone Classes

引用

15th ieee International working conference on source code analysis and manipulation (SCAM)

作者： Rapos, Eric J. Stevenson, Andrew Alalfi, Manar H. Cordy, James R. Queens Univ Sch Comp Kingston ON Canada

ISBN: (纸本)9781467375290

SimNav is a graphical user interface designed for displaying and navigating clone classes of Simulink models detected by the model clone detector Simone. As an embedded Simulink interface tool, SimNav allows model developers to explore detected clones directly in their own model development environment rather than a separate research tool interface. SimNav allows users to open selected models for side-by-side comparison, in order to visually explore clone classes and view the differences in the clone instances, as well as to explore the context in which the clones exist. This tool paper describes the motivation, implementation, and use cases for SimNav.

关键词： graphical user interfaces software maintenance source code (software) SimNav Simulink navigation embedded Simulink interface graphical user interface model clone class model clone detector Simone Cloning Detectors Graphical user interfaces Industries MATLAB Mathematical model graphical user interfaces Software maintenance Clone Cells MATLAB Mathematical Model Cloning industries detector

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Studying Fine-Grained Co-Evolution Patterns of Production and Test code 14

Studying Fine-Grained Co-Evolution Patterns of Production an...

引用

14th ieee International working conference on source code analysis and manipulation (SCAM)

作者： Marsavina, Cosmin Romano, Daniele Zaidman, Andy Delft Univ Technol NL-2600 AA Delft Netherlands

ISBN: (纸本)9780769553047

Numerous software development practices suggest updating the test code whenever the production code is changed. However, previous studies have shown that co-evolving test and production code is generally a difficult task that needs to be thoroughly investigated. In this paper we perform a study that, following a mixed methods approach, investigates fine-grained co-evolution patterns of production and test code. First, we mine fine-grained changes from the evolution of 5 open-source systems. Then, we use an association rule mining algorithm to generate the co-evolution patterns. Finally, we interpret the obtained patterns by performing a qualitative analysis. The results show 6 co-evolution patterns and provide insights into their appearance along the history of the analyzed software systems. Besides providing a better understanding of how test code evolves, these findings also help identify gaps in the test code thereby assisting both researchers and developers.

关键词： data mining program testing public domain software software engineering association rule mining algorithm coevolving test fine-grained coevolution patterns mixed methods approach open-source systems production code software development practices test code Association rules Educational institutions Production Software systems Statistical analysis Testing test codes Software systems Association rules open source software program testing Educational institutions Software engineering data mining Software design computer software

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Rebasing in code Review Considered Harmful: A Large-scale Empirical Investigation 19

Rebasing in Code Review Considered Harmful: A Large-scale Em...

引用

19th ieee International working conference on source code analysis and manipulation (SCAM)

作者： Paixao, Matheus Maia, Paulo Henrique Univ Estadual Ceara Distributed Software Engn Res Grp Fortaleza Ceara Brazil

ISBN: (纸本)9781728149370

code review has been widely acknowledged as a key quality assurance process in both open-source and industrial software development. Due to the asynchronicity of the code review process, the system's codebase tends to incorporate external commits while a source code change is reviewed, which cause the need for rebasing operations. External commits have the potential to modify files currently under review, which causes re-work for developers and fatigue for reviewers. Since source code changes observed during code review may be due to external commits, rebasing operations may pose a severe threat to empirical studies that employ code review data. Yet, to the best of our knowledge, there is no empirical study that characterises and investigates rebasing in real-world software systems. Hence, this paper reports an empirical investigation aimed at understanding the frequency in which rebasing operations occur and their side-effects in the reviewing process. To achieve so, we perform an in-depth large-scale empirical investigation of the code review data of 11 software systems, 28,808 code reviews and 99,121 revisions. Our observations indicate that developers need to perform rebasing operations in an average of 75.35% of code reviews. In addition, our data suggests that an average of 34.21% of rebasing operations tend to tamper with the reviewing process. Finally, we propose a methodology to handle rebasing in empirical studies that employ code review data. We show how an empirical study that does not account for rebasing operations may report skewed, biased and inaccurate observations.

关键词： Rebasing code Review Empirical Software Engineering

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Untangling Composite Commits Using Program Slicing 18

Untangling Composite Commits Using Program Slicing

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18th ieee International working conference on source code analysis and manipulation (SCAM)

作者： Muylaert, Ward De Roover, Coen Vrije Univ Brussel Software Languages Lab Brussels Belgium

ISBN: (纸本)9781538682906

Composite commits are a common mistake in the use of version control software. A composite commit groups many unrelated tasks, rendering the commit difficult for developers to understand, revert, or integrate and for empirical researchers to analyse. We propose an algorithmic foundation for tool support to identify such composite commits. Our algorithm computes both a program dependence graph and the changes to the abstract syntax tree for the files that have been changed in a commit. Our algorithm then groups these fine-grained changes according to the slices through the dependence graph they belong to. To evaluate our technique, we analyse and refine an established dataset of Java commits, the results of which we also make available. We find that our algorithm can determine whether or not a commit is composite. For the majority of commits, this analysis takes but a few seconds. The parts of a commit that our algorithm identifies do not map directly to the commit's tasks. The parts tend to be smaller, but stay within their respective tasks.

关键词： Changedistiller Changenodes Class dependence graph Commit Inter procedural Intra procedural Program dependence graph Program slicing Slicing Static analysis System dependence graph Tangled Tinypdg Untangling

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