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16th International Symposium on Theoretical Aspects of Software Engineering (TASE)

作者： Boender, Jaap Badevic, Goran Hensoldt Cyber GmbH Taufkirchen Germany

ISBN: (数字)9783031103636

ISBN: (纸本)9783031103636;9783031103629

This paper is an experience report concerning the verification of a component of our operating system using Isabelle. The component allows for the secure storage of cryptographic key material. We will discuss the method used, describe the connection we created between the component and a standard library, identify lessons learned (both for the verification itself as to the process followed to write and adapt the software to be verified), and discuss possible avenues for further research.

关键词： Formal verification Software verification c language Experience report Isabelle Key store

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PIcO: A Presburger In-bounds check Optimization for compiler-based Memory Safety Instrumentations

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AcM TRANSAcTIONS ON ARcHITEcTURE AND cODE OPTIMIZATION 2021年第4期18卷 1–27页

作者： Jung, Tina Ritter, Fabian Hack, Sebastian Saarland Univ SIC Compiler Design Lab Saarbrucken Germany

Memory safety violations such as buffer overflows are a threat to security to this day. A common solution to ensure memory safety for c is code instrumentation. However, this often causes high execution-time overhead and is therefore rarely used in production. Static analyses can reduce this overhead by proving some memory accesses in bounds at compile time. In practice, however, static analyses may fail to verify in-bounds accesses due to over-approximation. Therefore, it is important to additionally optimize the checks that reside in the program. In this article, we present PIcO, an approach to eliminate and replace in-bounds checks. PIcO exactly captures the spatial memory safety of accesses using Presburger formulas to either verify them statically or substitute existing checks with more efficient ones. Thereby, PIcO can generate checks of which each covers multiple accesses and place them at infrequently executed locations. We evaluate our LLVM-based PIcO prototype with the well-known SoftBound instrumentation on SPEc benchmarks commonly used in related work. PIcO reduces the execution-time overhead introduced by SoftBound by 36% on average (and the code-size overhead by 24%). Our evaluation shows that the impact of substituting checks dominates that of removing provably redundant checks.

关键词： Optimization spatial memory safety Presburger c language LLVM

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Memory Efficient Binary convolutional Neural Networks on Microcontrollers 6

Memory Efficient Binary Convolutional Neural Networks on Mic...

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6th IEEE International conference on Edge computing and communications (IEEE EDGE)

作者： Sakr, Fouad Berta, Riccardo Doyle, Joseph Younes, Hamoud De Gloria, Alessandro Bellotti, Francesco Univ Genoa Genoa Italy Queen Mary Univ London London England Lebanese Int Univ IMT Atlantique Brest France

ISBN: (数字)9781665481403

ISBN: (纸本)9781665481403

Binarization is a machine learning optimization for limited resource devices that has achieved significant results in edge applications. As microcontrollers are the mainstream platform for field applications in industry, this article investigates memory efficient deployment of binary neural networks (BNNs) to such devices. To this end, we developed a library of binarized NN layers in platform-independent c language. The implementation optimizes the memory footprint by adapting the number of filters and neurons for each layer to the c language specifications (8 bit addressable spacing and 32 bit floating points). We tested the library by implementing a BNN for robotic touch classification on a cortex-M7 microcontroller. Experimental results show the validity of the proposed hardware and software architecture, with improvements over the state of the art in robotic touch classification in terms of accuracy (+2%), memory footprint (+15%), and latency (+25%).

关键词： Binary Neural Networks Tiny ML Edge computing cortex-M micrcontrollers Robotic touch c language

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An Empirical Assessment on Merging and Repositioning of Static Analysis Alarms 22

An Empirical Assessment on Merging and Repositioning of Stat...

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IEEE 22nd International Working conference on Source code Analysis and Manipulation (ScAM)

作者： Mansoor, Niloofar Muske, Tukaram Serebrenik, Alexander Sharif, Bonita Univ Nebraska Lincoln NE 68583 USA Tata Consultancy Serv Pune Maharashtra India Eindhoven Univ Technol Eindhoven Netherlands

ISBN: (纸本)9781665496094

Static analysis tools generate a large number of alarms that require manual inspection. In prior work, repositioning of alarms is proposed to (1) merge multiple similar alarms together and replace them by a fewer alarms, and (2) report alarms as close as possible to the causes for their generation. The premise is that the proposed merging and repositioning of alarms will reduce the manual inspection effort. To evaluate the premise, this paper presents an empirical study with 249 developers on the proposed merging and repositioning of static alarms. The study is conducted using static analysis alarms generated on c programs, where the alarms are representative of the merging vs. non-merging and repositioning vs. non-repositioning situations in real-life code. Developers were asked to manually inspect and determine whether assertions added corresponding to alarms in c code hold. Additionally, two spatial cognitive tests are also done to determine relationship in performance. The empirical evaluation results indicate that, in contrast to expectations, there was no evidence that merging and repositioning of alarms reduces manual inspection effort or improves the inspection accuracy (at times a negative impact was found). Results on cognitive abilities correlated with comprehension and alarm inspection accuracy.

关键词： Static analysis Empirical study Manual inspection of alarms Repositioning of alarms c language

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Progress on Software Verification: SV-cOMP 2022 28th

Progress on Software Verification: SV-COMP 2022

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28th International conference on Tools and Algorithms for the construction and Analysis of Systems (TAcAS) Held as Part of the 25th European Joint conferences on Theory and Practice of Software (ETAPS)

作者： Beyer, Dirk Ludwig Maximilians Univ Munchen Munich Germany

ISBN: (纸本)9783030995270;9783030995263

The 11th edition of the competition on Software Verification (SV-cOMP 2022) provides the largest ever overview of tools for software verification. The competition is an annual comparative evaluation of fully automatic software verifiers for c and Java programs. The objective is to provide an overview of the state of the art in terms of effectiveness and efficiency of software verification, establish standards, provide a platform for exchange to developers of such tools, educate PhD students on reproducibility approaches and benchmarking, and provide computing resources to developers that do not have access to compute clusters. The competition consisted of 15 648 verification tasks for c programs and 586 verification tasks for Java programs. Each verification task consisted of a program and a property (reachability, memory safety, overflows, termination). The new category on data-race detection was introduced as demonstration category. SV-cOMP 2022 had 47 participating verification systems from 33 teams from 11 countries.

关键词： Formal verification Program analysis competition Software verification Verification tasks Benchmark c language Java language SV-Benchmarks BENcHEXEc cOVERITEAM

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Using an Online Serious Game to Teach Basic Programming concepts and Facilitate Gameful Experiences for High School Students

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IEEE AccESS 2021年 9卷 12567-12578页

作者： Montes, Hernan Hijon-Neira, Raquel Perez-Marin, Diana Montes, Sergio Univ Rey Juan Carlos Comp Sci Dept Madrid 28933 Spain Univ Rey Juan Carlos Dept Comp Sci Madrid 28933 Spain Univ Fuerzas Armadas ESPE Comp Sci Dept Sangolqui 171103 Ecuador

Teaching programming to pre-university students has attracted a great deal of attention in the last years. The benefits of teaching programming before University have been investigated by taking several approaches to improve the students' learning scores, motivation and satisfaction levels. Serious Games (SGs) are also gaining an increasing research interest for education. SGs can be defined as games designed for a primary goal other for than pure entertainment. In the case of this paper, the DFD-c serious game has been created to investigate whether High School students will improve their learning of programming fundamentals and, if there are gender differences in the improvement. Moreover, it is explored the perception of the gameful experience by the students when using a serious game such as DFD-c, and if this perception is different in the case of boys or girls. An experiment with 38 K-10 High School students has been carried out during the 2019-2020 academic year. All students took a pre-test at the beginning of the experiment. After that, they were randomly split into a control group (no use of DFD-c) and a test group (use of DFD-c). Finally, all of them took the same test (post-test) to measure their learning gains. The test group also completed the Gamefulquest questionnaire to evaluate their perception of the gameful experience. A significant improvement in the scores of the test students was registered, with no gender differences. Moreover, the answers to the Gamefulquest reveal that students had a positive gameful experience, being the ratings of the girls slightly higher than boys. It is concluded that using SGs to teach learning programming fundamentals to High School students increased their learning scores and students perceived the sense of playfulness, guidance and social experience of the SG without having significant differences between girls and boys.

关键词： Games Programming profession Programming Education Kernel Tools Serious games Serious games programming basics gameful experience data flow diagrams c language

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Teaching Study on c language Program Design course Based on computational Thinking

Teaching Study on C Language Program Design Course Based on ...

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2nd International conference on Simulation and Modeling Methodologies,Technologies and Applications(SMTA 2015)

作者： Ying Li Shimin Zhang Meihua Wang Institute of Information Science & Engineering Hebei University of Science and Technology

According to the current situation of c programming teaching in universities, the paper puts forward a series of reform measures implemented in the teaching and some good results are achieved. Through the teaching reform and practice of c programming courses, it stimulates the interest from students in learning, improves their learning enthusiasm, initiative and creativity, and cultivates computational thinking and innovation of students. The education quality has been improved.

关键词： computational thinking Teaching reform c language Programming design case design

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The Impact of Undefined Behavior on compiler Optimization 2

The Impact of Undefined Behavior on Compiler Optimization

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2nd European Symposium on Software Engineering (ESSE)

作者： Shen, Zefan Univ Hertfordshire Sch Phys Engn & Comp Sci Hatfield AL10 9AB Herts England

ISBN: (纸本)9781450385060

With the development of society and the improvement of life quality, people's requirements for software experience are becoming more and more stringent. Performance optimization is becoming more and more important in software design. At present, most compilers support the default optimization options of o 1, o 2 and o 3, such as the Gcc compiler. In order to meet the different degrees of optimization needs of users, it provides nearly a hundred optimization options for compiling time, target file length, and execution. At the same time, compiler optimization options will adjust the code execution order, and different optimization options will treat undefined behaviors differently. This work mainly tests the impact of undefined behavior (UB) on compiler optimization at different levels. The results show that UB has both positive and negative effects on the compiler. In addition, this paper reminds programmers to learn to improve their code specifications and correctly handle these undefined behaviors.

关键词： Undefined behavior gcc-o0 gcc-o1 gcc-o2 gcc-o3 clang compiler c language

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Software Verification: 10th comparative Evaluation (SV-cOMP 2021) 27th

Software Verification: 10th Comparative Evaluation (SV-COMP ...

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27th International conference on Tools and Algorithms for construction and Analysis of Systems (TAcAS)

作者： Beyer, Dirk Ludwig Maximilians Univ Munchen Munich Germany

ISBN: (纸本)9783030720124;9783030720131

SV-cOMP 2021 is the 10th edition of the competition on Software Verification (SV-cOMP), which is an annual comparative evaluation of fully automatic software verifiers for c and Java programs. The competition provides a snapshot of the current state of the art in the area, and has a strong focus on reproducibility of its results. The competition was based on 15 201 verification tasks for c programs and 473 verification tasks for Java programs. Each verification task consisted of a program and a property (reachability, memory safety, overflows, termination). SV-cOMP 2021 had 30 participating verification systems from 27 teams from 11 countries.

关键词： Formal Verification Program Analysis competition Software Verification Verification Tasks Benchmark c language Java language SV-Benchmarks

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genomicSimulation: fast R functions for stochastic simulation of breeding programs

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G3-GENES GENOMES GENETIcS 2022年第10期12卷 jkac216页

作者： Villiers, Kira Dinglasan, Eric Hayes, Ben J. Voss-Fels, Kai P. Univ Queensland Queensland Alliance Agr & Food Innovat St Lucia Qld 4072 Australia Hsch Geisenheim Univ Dept Grapevine Breeding D-65366 Geisenheim Germany

Simulation tools are key to designing and optimizing breeding programs that are multiyear, high-effort endeavors. Tools that operate on real genotypes and integrate easily with other analysis software can guide users toward crossing decisions that best balance genetic gains and genetic diversity required to maintain gains in the future. Here, we present genomicSimulation, a fast and flexible tool for the stochastic simulation of crossing and selection based on real genotypes. It is fully written in c for high execution speeds, has minimal dependencies, and is available as an R package for the integration with R's broad range of analysis and visualization tools. comparisons of a simulated recreation of a breeding program to a real data set demonstrate the simulated offspring from the tool correctly show key population features, such as genomic relationships and approximate linkage disequilibrium patterns. Both versions of genomicSimulation are freely available on GitHub: The R package version at https://***/vllrs/genomicSimulation/ and the c library version at https://***/vllrs/genomicSimulationc/.

关键词： breeding program simulation meiosis simulation breeding program design genomic selection R package c language

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