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A survey of tagged union type usage in modern C++ projects 7

A survey of tagged union type usage in modern C++ projects

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7th International Conference on Software and System Engineering, ICoSSE 2024

作者： Spaits, Gabor Umann, Kristof Porkolab, Zoltan Eötvös Loránd University Dept. of Programming Languages and Compilers Budapest Hungary

ISBN: (纸本)9798350386592

Insoftware development, there are various problems for which union types are a suitable solution. In \mathbf{C}, and in the earlier \mathrm{C}++ versions only untagged unions were available. \mathbf{C}++17 introduced the standard library class std::variant as a tagged union type. A tagged union keeps track of the type of the last inserted object. Variants are safer, as they offer various compile-time and runtime mechanisms to guard against misuse. However, it is not impossible to make mistakes with them. In this paper, we surveyed seven large, open source projects, that use std::variant. The purpose of the survey was (1) to understand how \mathrm{C}++ projects are using tagged unions, (2) what programming errors can be made with them, and (3) in what way the application of static analysis tools could facilitate the creation of safer code. We observed that variants are used for a wide range of tasks, including network communications, giving alternative implementations to classes, or even in a mechanism reminiscent of inheritance. We learned that values are retrieved from variants in almost all various standard-provided manners except for exceptions. Based on our observations we specified and implemented an open source static analysis checker to detect one of the most critical variant-related problems occurring in \mathrm{C}++ programs. © 2024 IEEE.

关键词： C++ (programming language)

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A survey of tagged union type usage in modern C++ projects

A survey of tagged union type usage in modern C++ projects

引用

Software and System Engineering (ICoSSE), International Conference on

作者： Gábor Spaits Kristóf Umann Zoltán Porkoláb Dept. of Programming Languages and Compilers Eötvös Loránd University Budapest Hungary

ISBN: (数字)9798350386592

ISBN: (纸本)9798350386608

Insoftware development, there are various problems for which union types are a suitable solution. In $\mathbf{C}$, and in the earlier $\mathrm{C}++$ versions only untagged unions were available. $\mathbf{C}++17$ introduced the standard library class std::variant as a tagged union type. A tagged union keeps track of the type of the last inserted object. Variants are safer, as they offer various compile-time and runtime mechanisms to guard against misuse. However, it is not impossible to make mistakes with them. In this paper, we surveyed seven large, open source projects, that use std::variant. The purpose of the survey was (1) to understand how $\mathrm{C}++$ projects are using tagged unions, (2) what programming errors can be made with them, and (3) in what way the application of static analysis tools could facilitate the creation of safer code. We observed that variants are used for a wide range of tasks, including network communications, giving alternative implementations to classes, or even in a mechanism reminiscent of inheritance. We learned that values are retrieved from variants in almost all various standard-provided manners except for exceptions. Based on our observations we specified and implemented an open source static analysis checker to detect one of the most critical variant-related problems occurring in $\mathrm{C}++$ programs.

关键词： Surveys Codes Runtime Source coding Static analysis C++ languages programming

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Exploring Attribute-Based Facial Synthesis with Generative Adversarial Networks for Enhanced Patient Simulator Systems

Exploring Attribute-Based Facial Synthesis with Generative A...

引用

Software and System Engineering (ICoSSE), International Conference on

作者： Tariq Emad Ali Faten Imad Ali Norbert Pataki Alwahab Dhulfiqar Zoltán dept. of Information and Communication Engineering Al-Khwarizmi College of Engineering University of Baghdad Baghdad Iraq dept. of Biomedical Engineering College of Engineering AL-Nahrain University Baghdad Iraq dept. of Programming Languages and Compilers Faculty of Informatics Eötvös Loránd University Budapest Hungary

ISBN: (数字)9798350386592

ISBN: (纸本)9798350386608

Image generation using deep learning generative models has witnessed significant strides in various domains, particularly in scene and object generation. However, the complexities escalate when applied to facial image generation, especially in healthcare scenarios where detailed and realistic depictions are crucial. This paper introduces a pioneering approach to generating lifelike faces with specific attributes, including age, hair color, and gender, leveraging the manipulable latent space of a Generative Adversarial Network (GAN). The proposed system not only holds promise for applications such as criminal identification and film production but also showcases practical implications in the healthcare domain. By offering a user-friendly interface for attribute input and face display, the system facilitates healthcare professionals in generating diverse patient avatars for medical training simulations. The implementation utilizes Python, PyTorch, and the CelebA dataset, with the training process conducted on Google Colab for computational efficiency. This work represents a novel intersection of advanced deep learning, human-computer interaction, and real-world healthcare applications, providing a holistic exploration of attribute-driven face synthesis in the medical field.

关键词： Training Deep learning Image synthesis Medical services Generative adversarial networks Systems engineering and theory Software

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Survey on static analysis tools of python programs 8

Survey on static analysis tools of python programs

引用

8th Workshop on Software Quality Analysis, Monitoring, Improvement, and Applications, SQAMIA 2019

作者： Gulabovska, Hristina Porkoláb, Zoltán Eötvös Loránd University Faculty of Informatics Dept. of Programming Languages and Compilers Pázmány Péter sétány 1/C BudapestH-1177 Hungary

ISBN: (纸本)9788670314764

Static program analysis is a popular software technique performed by automated tools for verifying large scale software systems. It works without executing the program, just analyzing the source code and applying various heuristics to find possible errors, code smells and style discrepancies. programming languages with strong static type system, like C, C++, Java are the usual targets of static analysis, as their type system provides additional information for the analyzer. However, there is a growing demand for applying static analysis for dynamically typed languages, like Python. In this paper we overview the current methods and tools available for static analysis on Python code base and describe some new research directions. Copyright © 2019 for this paper by its authors. Use permitted under Creative Commons License Attribution 4.0 International (CC BY 4.0).

关键词： Static analysis

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Utilize syntax tree transformations as a C/C++ test seam 7

Utilize syntax tree transformations as a C/C++ test seam

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7th Workshop on Software Quality Analysis, Monitoring, Improvement, and Applications, SQAMIA 2018

作者： Márton, Gábor Porkoláb, Zoltán Eotvos Lorand University Faculty of Informatics Dept. of Programming Languages and Compilers Pázmány Péter sét ány 1/C BudapestH-1177 Hungary

ISBN: (纸本)9788670314733

In C/C++, test code often inuences the source code of the unit we want to test. During the test development process we often have to introduce new interfaces to replace existing dependencies, e.g. a supplementary setter or constructor function has to be added to a class for dependency injection. In many cases, extra template parameters are used for the same purpose. These solutions may have serious detrimental effects on the code structure and sometimes on the run-time performance as well. We can use non-intrusive tests (tests which does not require any modification in the production code) to avoid these disadvantages. Also, in legacy code bases often there are few or no unit tests. Refactoring such code in order to provide tests is almost impossible because we cannot verify correctness without having unit tests;hence it is a vicious circle. We can break the circle with non-intrusive tests, i.e. without actually modifying the production code. The different non-intrusive testing methods have different weaknesses. In this paper we introduce our new non-intrusive testing approach which complements the existing techniques. Our solution transforms certain parts of the original abstract syntax tree of the production code for the purpose of testing. © 2018 by the paper's authors.

关键词： Syntactics

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Read-copy-update as a possible locking strategy in scala 7

Read-copy-update as a possible locking strategy in scala

引用

7th Workshop on Software Quality Analysis, Monitoring, Improvement, and Applications, SQAMIA 2018

作者： Nagy, Gergely Porkoláb, Zoltán Eotvos Loránd University Faculty of Informatics Dept. of Programming Languages and Compilers Pázmány Péter sétány 1/C BudapestH-1177 Hungary

ISBN: (纸本)9788670314733

Concurrent programming with classical mutex/lock techniques does not scale well when reads are way more frequent than writes. In such situations the read-copy-update (RCU) locking pattern guarantees minimal overhead for read operations and allows them to occur concurrently with write operations thus may outperform classical mutexes or reader-writer locks. RCU is well-known technique among C programmers implementing performance critical low level multithreaded applications, like operating system kernels. Up to now, RCU pattern was rarely applied for high level programming languages. In this paper, we argue in favor of applying RCU for higher level object-oriented constructions and present our experimental Scala RCU class library. The library has been carefully designed to optimize performance in a heavily multithreaded environment, in the same time providing high-level abstractions, applicable in the multiparadigm environment where Scala programming language is typically utilized. We evaluated our library implementing a concurrent HashMap container. © 2018 by the paper's authors.

关键词： Locks (fasteners)

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Towards Better Symbol Resolution for C/C++ Programs: A Cluster-Based Solution 17

Towards Better Symbol Resolution for C/C++ Programs: A Clust...

引用

17th IEEE International Working Conference on Source Code Analysis and Manipulation, SCAM 2017

作者： Szalay, Richard Porkolab, Zoltan Krupp, Daniel Eotvos Lorand University Faculty of Informatics Dept. of Programming Languages and Compilers Hungary Ericsson Ltd. Sweden

ISBN: (纸本)9781538632383

Resolving symbol references is an important part of many application areas from development environments to various static analyser tools, especially when it is used for code comprehension purposes. Different occurrences of the same program elements, like function definitions and their call sites, variable declarations and their usage, or type definitions and their applications should be connected. In case of the C++ programming language, the most current tools use mangled names to correlate symbols, e.g. when implementing actions like 'go to definition' or 'list all references'. However, for large projects, where multiple binaries are created, symbol resolution based on mangled names can be, and usually is, ambiguous. This leads to inaccurate behaviour even in major development tools. In this paper we explore the reason of this ambiguity, and propose our clustering algorithm based on essential build information to improve the accuracy of symbol resolution. We implemented our method as part of the CodeCompass open source code comprehension tool and measured its efficiency. © 2017 IEEE.

关键词： Static analysis

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High-level C++ implementation of the read-copy-update pattern 14

High-level C++ implementation of the read-copy-update patter...

引用

14th IEEE International Scientific Conference on Informatics, INFORMATICS 2017

作者： Marton, Gabor Szekeres, Imre Porkolab, Zoltan Eötvös Loránd University Faculty of Informatics Dept. of Programming Languages and Compilers H-1117 Pazmany Peter setany 1/C Budapest Hungary

ISBN: (纸本)9781538608890

Concurrent programming with classical mutex/lock techniques does not scale well when reads are way more frequent than writes. Such situation happens in operating system kernels among other performance critical multithreaded applications. Read copy update (RCU) is a well know technique for solving the problem. RCU guarantees minimal overhead for read operations and allows them to occur concurrently with write operations. RCU is a favourite concurrent pattern in low level, performance critical applications, like the Linux kernel. Currently there is no high-level abstraction for RCU for the C++ programming language. In this paper, we present our C++ RCU class library to support efficient concurrent programming for the read-copy-update pattern. The library has been carefully designed to optimise performance in a heavily multithreaded environment, in the same time providing high-level abstractions, like smart pointers and other C++11/14/17 features. © 2017 IEEE.

关键词： Abstracting

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Measuring mangled name ambiguity in large C/ C++ projects 6

Measuring mangled name ambiguity in large C/ C++ projects

引用

6th Workshop on Software Quality Analysis, Monitoring, Improvement, and Applications, SQAMIA 2017

作者： Szalay, Richárd Porkoláb, Zoltán Krupp, Dániel Eötvös Loránd University Faculty of Informatics Dept. of Programming Languages and Compilers Pazmany Peter setany 1/C BudapestH-1177 Hungary Ericsson Hungary Ltd. Irinyi József utca 4-20. BudapestH-1117 Hungary

ISBN: (纸本)9788670313552

Symbol reference has an important role in various areas of software technology. Some modern object-oriented languages use it for implementing function and operator overloading, linkers use it for connecting objects between different translation units, and development environments need to accurately understand them to provide features like traversing all references. In case of the C++ programming language, the most current tools use mangled names to correlate symbols, e.g. when implementing actions like "go to definition" or "list all references". However, for large projects, where multiple binaries are created, symbol resolution based on mangled names can be, and usually is, ambiguous. This leads to inaccurate behaviour even in major development tools. Does this problem inherently stem from the size of the codebase, or is it just another indication of possibly underachieving software quality? In this paper, we discuss the prevalence of this problem on five projects, from open source to industrial code bases with varying degree of code size, to give an input on whether or not the research of a better symbol resolution algorithm is necessary. © Copyright 2017 by the paper's authors.

关键词： Object oriented programming

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Low level conditional move optimization

Low level conditional move optimization

引用

作者： Antyipin, Artyom Attila, Ǵobi Kozsik, Tamás Dept. Programming Languages and Compilers Eötvös Lorand University Budapest Hungary

The high level optimizations are becoming more and more sophisticated, the importance of low level optimizations should not be underestimated. Due to the changes in the inner architecture of modern processors, some optimization techniques may become more or less effective. Existing techniques need, from time to time, to be reconsidered, and new techniques, targeting these modern architectures, may emerge. Due to the growing instruction pipeline of modern processors, recovering after branch mis-predictions is becoming more expensive, and so avoiding that is becoming more critical. In this paper we introduce a novel approach to branch elimination using conditional move operations, namely the CMOVcc instruction group. The inappropriate use of these instructions may result in sensible performance regression, but in many cases they outperform the sequence of a conditional jump and an unconditional move instruction. Our goal is to analyze the usage of CMOVcc in different contexts on modern processors, and based on these results, propose a technique to automatically decide whether the conditional move or the sequence of a conditional jump and an unconditional move should be performed in a given situation.

关键词： Pipeline processing systems

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