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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

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Low level conditional move optimization

Low level conditional move optimization

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

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

引用

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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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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Type-preserving heap profiler for C++

Type-preserving heap profiler for C++

引用

27th IEEE International Conference on Software Maintenance, ICSM 2011

作者： Mihalicza, József Porkoláb, Zoltán Gábor, Ábel Eötvos Loränd University Faculty of Informatics Dept. of Programming Languages and Compilers Hungary NNG Ltd. Hungary

ISBN: (纸本)9781457706646

Memory profilers are essential tools to understand the dynamic behaviour of complex modern programs. They help to reveal memory handling details: the wheres, the whens and the whats of memory allocations. Most heap profilers provide sufficient information about which part of the source code is responsible for the memory allocations by showing us the relevant call stacks. The sequence of allocations inform us about their order. However, in case of some strongly typed programming languages, like C++, the question what has been allocated is not trivial. Reporting the actual allocation size gives minimal or no information about the structure or type of the allocated objects. Though this information can be retrieved from the location and time of allocation, it cannot be easily automated, if at all. Therefore in large software systems programmers do not have an overall picture of which data structures are responsible for bottlenecks and have too few clues for pinpointing enhancement possibilities. In this paper we present a type-preserving heap profiler for C++. On top of the usual heap profiler features our allocation entries, including those of template constructs, contain exact type information about the allocated objects. We can extract information on individual memory operations as well as supply aggregated overview. Having such a type information in hand programmers can identify critical classes more easily and can perform optimizations based on evidence rather than speculations. © 2011 IEEE.

关键词： Storage allocation (computer)

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Debugging C++ template metaprograms 06

Debugging C++ template metaprograms

引用

5th International Conference on Generative programming and Component Engineering, GPCE'06. Co-located with the 21st International Conference on Object-Oriented programming, Systems, languages, and Applications, OOPSLA 2006

作者： Porkoláb, Zoltán Mihalicza, József Sipos, Ádám Eötvös Loránd University Dept. of Programming Languages and Compilers Pazmany Peter setany 1/C H-1117 Budapest Hungary

ISBN: (纸本)1595932372

Template metaprogramming is an emerging new direction in C++ programming for executing algorithms in compilation time. Despite all of its already proven benefits and numerous successful applications, it is yet to be accepted in industrial projects. One reason is the lack of professional software tools supporting the development of template metaprograms. A strong analogue exists between traditional runtime programs and compile-time metaprograms. This connection presents the possibility for creating development tools similar to those already used when writing runtime programs. This paper introduces Templight, a debugging framework that reveals the steps executed by the compiler during the compilation of C++ programs with templates. Templight's features include following the instantiation chain, setting breakpoints, and inspecting metaprogram information. This framework aims to take a step forward to help template metaprogramming become more accepted in the software industry. Copyright © 2006 ACM.

关键词： Program debugging

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Visualization of C++ template metaprograms

Visualization of C++ template metaprograms

引用

IEEE Working Conference on Source Code Analysis and Manipulation

作者： Borók-Nagy, Zoltán Májer, Viktor Mihalicza, József Pataki, Norbert Porkoláb, Zoltán Dept. of Programming Languages and Compilers Eötvös Loránd University Faculty of Informatics Pazmany Peter Setany 1/C H-1117 Budapest Hungary

ISBN: (纸本)9780769541785

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 em- bedding and active libraries. Despite all of its already proven benefits and numerous successful applications there are surprisingly few tools for creating, supporting, and ana- lyzing C++ template metaprograms. As metaprograms are executed at compilation time they are even harder to under- stand. In this paper we present a code visualization tool, which is utilizing Templight, our previously developed C++ template metaprogram debugger. Using the tool it is pos- sible to visualize the instantiation chain of C++ templates and follow the execution of metaprograms. Various presen- tation 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 metapro- grams, and can enhance their acceptance in the software industry. © 2010 IEEE.

关键词： Visualization

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Functional programming with C++ template metaprograms

Functional programming with C++ template metaprograms

引用

3rd Central European Functional programming School, CEFP 2009

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

ISBN: (纸本)3642176844

Template metaprogramming is an emerging new direction of generative programming. With the clever definitions of templates 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 adaption, language embedding and active libraries. However, as template metaprogramming was not an original design goal, the C++ language is not capable of elegant expression of metaprograms. The complicated syntax leads to the creation of code that is hard to write, understand and maintain. Although template metaprogramming has a strong relationship with functional programming, this is not reflected in the language syntax and existing libraries. In this paper we give a short and incomplete introduction to C++ templates and the basics of template metaprogramming. We will enlight the role of template metaprograms, and some important and widely used idioms. We give an overview of the possible application areas as well as debugging and profiling techniques. We suggest a pure functional style programming interface for C++ template metaprograms in the form of embedded Haskell code which is transformed to standard compliant C++ source. © 2010 Springer-Verlag.

关键词： Functional programming

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Embedding a proof system in Haskell

Embedding a proof system in Haskell

引用

3rd Central European Functional programming School, CEFP 2009

作者： Dévai, Gergely Eötvös Loránd University Faculty of Informatics Dept. of Programming Languages and Compilers Pazmany Peter setany 1/C H-1117 Budapest Hungary

ISBN: (纸本)3642176844

This article reports about a work-in-progress project that aims at embedding a proof system [4] in the Haskell programming language. The goal of the system is to create formally verified software using the correctness by construction principle. Using Haskell as the host language provides a powerful and flexible environment so that programming language tools can be used to build proofs. The main contribution of this paper is the systematic analysis of different techniques for language embedding. We present design decisions by pointing out which techniques are applicable and which ones are inappropriate or inconvenient to use when embedding a proof system like the our one. We also point out the advantages of the embedding compared to a previous implementation of the same system. © 2010 Springer-Verlag.

关键词： Computer programming languages

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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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