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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

引用

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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Rule-based assignment of comments to AST nodes in C++ programs 12

Rule-based assignment of comments to AST nodes in C++ progra...

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5th Balkan Conference in Informatics, BCI 2012

作者： Cséri, Tamás Szugyi, Zalán Porkoláb, Zoltán Dept. of Programming Languages and Compilers Faculty of Informatics Eötvös Loránd University Péter sétány 1/C H-1117 Budapest Hungary

ISBN: (纸本)9781450312400

Comments are essential components of programming languages: they preserve the developer's intentions, help the maintainers to understand hidden concepts, and may act as a source of automatic documentation generation. However most of the software maintenance tools (refactorers, slicing and analyser tools) ignore them therefore they lose an important part of information about the software. One of the reasons why tools neglect comments is that there is no single well-defined location in the software's AST where to place them. The relationship between the program's control structure and the comments depend on code conventions and human habits. Our research - part of a project to develop a software maintenance tool - focuses on the code comprehension process of large legacy C++ projects and heavily utilize code comments. We evaluated the commenting behaviour used in large projects and categorized the major patterns. We found that these patterns are strongly correlating in a single project. In the paper we present a method to find the correct place of the comments in the AST-based on project-specific rules. We evaluate our method and test it against open source C++ projects. Copyright 2012 ACM.

关键词： Trees (mathematics)

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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 more sophisticated access control 11

Towards more sophisticated access control

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11th Symposium on programming languages and Software Tools and 7th Nordic Workshop on Model Driven Software Engineering, SPLST 2009 and NW-MODE 2009

作者： Mihalicza, József Pataki, Norbert Porkoláb, Zoltán Sipos, Adam Dept. of Programming Languages and Compilers Faculty of Informatics Eötvös Lorand University Pázmany Péter Sétány 1/C BudapestH-1117 Hungary

ISBN: (纸本)9789521522123

Encapsulation and information hiding play a crucial role in object-oriented software development. While assisting the creation of abstractions they minimize the dependences among distinct modules. Modern languages have different approaches to access control, but in statically typed object-oriented languages the simple public-protected-private categorization is the most common. Unfortunately, the expressive power of this categorization is not sufficient for fine-grained access control, since services are exported to clients in an anonymous way. In this paper the visibility strategies of modern programming languages are compared first. Scenarios are described where more delicate access control is necessary. Earlier experiments of the authors have proved that a library based solution for selective access would produce unacceptable syntactical overhead on programmer. Therefore, we propose here a language extension to C++ programming language. The extension is based on the syntax of concepts, a notation invented in the next standard C++0x and provides an Eiffel-like selective access control for C++ programs. We created an experimental implementation based on the EDG C++ compiler front-end. Our memberwise access specifications provide selective export, which handle not only methods, but also nested types and typedefs. Various visibility strategies can be implemented supporting the usage of individual clients and access groups, roles, and inheritance-driven policies. © 2018 SPLST 2009 and NW-MODE 2009 - Proceedings of 11th Symposium on programming languages and Software Tools and 7th Nordic Workshop on Model Driven Software *** Rights Reserved.

关键词： Access control

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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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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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Central European Functional programming School 1

引用

丛书名： Lecture Notes in Computer Science

1000年

作者： Zoltán Horváth Rinus Plasmeijer Anna Soós Viktória Zsók

ISBN: (数字)9783540880592

ISBN: (纸本)9783540880585

This volume presents the revised lecture notes of selected talks given at the second Central European Functional programming School, CEFP 2007, held June 23–30, 2007 at Babe¸ s-Bolyai University, Cluj-Napoca, Romania. The summer school was organized in the spirit of the advanced progr- ming schools. CEFP focuses on involving an ever-growing number of students, researchers,andteachersfromcentral,*** were glad to welcome the invited lecturers and the participants: 15 professors and 30 students from 9 di?erent universities. The intensive program o?ered a creative and inspiring environment and a great opportunity to present and exchange ideas in new topics of functional programming. The lectures covereda wide range of topics like interactive work ?ows for the Web, proving properties of lazy functional programs, lambda calculus and - stract lambda calculus machines, programming in ? mega, object-oriented fu- tional programming, and refactoring in Erlang. We are very grateful to the lecturers and researchers for the time and the e?ort they devoted to the talks and the revised lecture notes. The lecture notes were each carefully checked by reviewers selected from experts of functional programming. Afterwards the papers were revised once more by the lecturers. This revision process guaranteed that only high-quality papers are accepted in the volume of the lecture notes.

关键词： programming languages, compilers, Interpreters programming Techniques Software Engineering/programming and Operating Systems Software Engineering Mathematical Logic and Formal languages Theory of Computation

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Visualization of C++ Template Metaprograms

Visualization of C++ Template Metaprograms

引用

IEEE International Workshop on Source Code Analysis and Manipulation

作者： Zoltán Borók-Nagy Viktor Májer Jozsef Mihalicza Norbert Pataki Zoltan Porkolab Dept. of Programming Languages and Compilers Eötvös Loránd University Budapest Hungary

Template metaprograms have become an essential part of today's C++ programs: with proper template definitions we can force the C++ compiler to execute algorithms at compilation time. Among the application areas of template metaprograms are the expression templates, static interface checking, code optimization with adaptation, language embedding and active libraries. Despite all of its already proven benefits and numerous successful applications there are surprisingly few tools for creating, supporting, and analyzing C++ template metaprograms. As metaprograms are executed at compilation time they are even harder to understand. In this paper we present a code visualization tool, which is utilizing Tem plight, our previously developed C++ template metaprogram debugger. Using the tool it is possible to visualize the instantiation chain of C++ templates and follow the execution of metaprograms. Various presentation layers, filtering of template instances and step-by-step replay of the instantiations are supported. Our tool can help to test, optimize, maintain C++ template metaprograms, and can enhance their acceptance in the software industry.

关键词： Visualization Data structures Context Instruments Debugging Libraries programming

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Autonomous applications - Towards a better data integration model

Autonomous applications - Towards a better data integration ...

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9th East-European Conference on Advances in Databases and Information Systems, ADBIS 2005

作者： Benczúr, András Hernáth, Zsolt Porkoláb, Zoltán Eötvös Loránd University Faculty of Informatics Dept. of Information Systems Pazmany Peter setany 1/C H-1117 Budapest Hungary Eötvös Loránd University Faculty of Informatics Dept. of Programming Languages and Compilers Pazmany Peter setany 1/C H-1117 Budapest Hungary

One of the most important and critical part of integrating already existing standalone applications is to design and implement a common data model and the corresponding data access layer which makes both data sources and processed results being shared and accessible over the applications in question. In case of even well-architected applications or application systems, establishing a common data model and the layer that gives access to data costs relatively large human and computer development resources. The problem of integration may be investigated from several aspects. The esence of these aproaches are the same: trying to achieve run-time environment independent applications' logic. One aspect is OMG's Model Driven Architecture Frame Work [5]. The primary goals of OMG's MDA are portability, interoperability and resuability through architectural concernes of specifying Application's logic, their operational environments, and technical aspects of their implementation details, and mappings between them. This paper views the same problem but with focus on different structural apearances of applications' data, mappings between them, and possible integration of such data models. We call applications autonomous, if they are independent of their all time run-time data access environment. Concerning applications' autonomy, our base idea is that the most natural media that is able to carry information on structural apperance of data and mappings between them are data themselves, using Document Data Model also presented here.

关键词： Mapping

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

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

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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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