Symbolic execution of verification languages and floating-point code

The focus of this thesis is a program analysis technique named symbolic execution. We present three main contributions to this field. First, an investigation into comparing several state-of-the-art program analysis tools at the level of an intermediate verification language over a large set of benchmarks, and improvements to the state-of-the-art of symbolic execution for this language. This is explored via a new tool, Symbooglix, that operates on the Boogie intermediate verification language. Second, an investigation into performing symbolic execution of floating-point programs via a standardised theory of floating-point arithmetic that is supported by several existing constraint solvers. This is investigated via two independent extensions of the KLEE symbolic execution engine to support reasoning about floating-point operations (with one tool developed by the thesis author). Third, an investigation into the use of coverage-guided fuzzing as a means for solving constraints over finite data types, inspired by the difficulties associated with solving floating-point constraints. The associated prototype tool, JFS, which builds on the LibFuzzer project, can at present be applied to a wide range of SMT queries over bit-vector and floating-point variables, and shows promise on floating-point constraints.Open Acces

Tools and Algorithms for the Construction and Analysis of Systems

This open access two-volume set constitutes the proceedings of the 27th International Conference on Tools and Algorithms for the Construction and Analysis of Systems, TACAS 2021, which was held during March 27 – April 1, 2021, as part of the European Joint Conferences on Theory and Practice of Software, ETAPS 2021. The conference was planned to take place in Luxembourg and changed to an online format due to the COVID-19 pandemic. The total of 41 full papers presented in the proceedings was carefully reviewed and selected from 141 submissions. The volume also contains 7 tool papers; 6 Tool Demo papers, 9 SV-Comp Competition Papers. The papers are organized in topical sections as follows: Part I: Game Theory; SMT Verification; Probabilities; Timed Systems; Neural Networks; Analysis of Network Communication. Part II: Verification Techniques (not SMT); Case Studies; Proof Generation/Validation; Tool Papers; Tool Demo Papers; SV-Comp Tool Competition Papers

Building Better Bit-Blasting for Floating-Point Problems

An effective approach to handling the theory of floating-point is to reduce it to the theory of bit-vectors. Implementing the required encodings is complex, error prone and requires a deep understanding of floating-point hardware. This paper presents SymFPU, a library of encodings that can be included in solvers. It also includes a verification argument for its correctness, and experimental results showing that its use in CVC4 out-performs all previous tools. As well as a significantly improved performance and correctness, it is hoped this will give a simple route to add support for the theory of floating-point

Tools and Algorithms for the Construction and Analysis of Systems

This open access book constitutes the proceedings of the 28th International Conference on Tools and Algorithms for the Construction and Analysis of Systems, TACAS 2022, which was held during April 2-7, 2022, in Munich, Germany, as part of the European Joint Conferences on Theory and Practice of Software, ETAPS 2022. The 46 full papers and 4 short papers presented in this volume were carefully reviewed and selected from 159 submissions. The proceedings also contain 16 tool papers of the affiliated competition SV-Comp and 1 paper consisting of the competition report. TACAS is a forum for researchers, developers, and users interested in rigorously based tools and algorithms for the construction and analysis of systems. The conference aims to bridge the gaps between different communities with this common interest and to support them in their quest to improve the utility, reliability, exibility, and efficiency of tools and algorithms for building computer-controlled systems

Tools and Algorithms for the Construction and Analysis of Systems

This open access book constitutes the proceedings of the 28th International Conference on Tools and Algorithms for the Construction and Analysis of Systems, TACAS 2022, which was held during April 2-7, 2022, in Munich, Germany, as part of the European Joint Conferences on Theory and Practice of Software, ETAPS 2022. The 46 full papers and 4 short papers presented in this volume were carefully reviewed and selected from 159 submissions. The proceedings also contain 16 tool papers of the affiliated competition SV-Comp and 1 paper consisting of the competition report. TACAS is a forum for researchers, developers, and users interested in rigorously based tools and algorithms for the construction and analysis of systems. The conference aims to bridge the gaps between different communities with this common interest and to support them in their quest to improve the utility, reliability, exibility, and efficiency of tools and algorithms for building computer-controlled systems

Proceedings of SAT Competition 2018 : Solver and Benchmark Descriptions

Non peer reviewe

Fundamental Approaches to Software Engineering

This open access book constitutes the proceedings of the 23rd International Conference on Fundamental Approaches to Software Engineering, FASE 2020, which took place in Dublin, Ireland, in April 2020, and was held as Part of the European Joint Conferences on Theory and Practice of Software, ETAPS 2020. The 23 full papers, 1 tool paper and 6 testing competition papers presented in this volume were carefully reviewed and selected from 81 submissions. The papers cover topics such as requirements engineering, software architectures, specification, software quality, validation, verification of functional and non-functional properties, model-driven development and model transformation, software processes, security and software evolution

Automated UVM Testbench Generation Using EMF

La verifica di dispositivi digitali complessi richiede lo sviluppo di testbench che diventano sempre più complessi con un aumento continuo dei tempi di realizzazione e di manutenzione. La metodologia UVM (Universal Verification Methodology) è stata introdotta dall'industria per permettere un'astrazione dell'ambiente di verifica ed allo stesso tempo aumentare la capacità di riutilizzo dei componenti. Rimane però complicata la creazione. Questo elaborata esplora una possibile strategia, basata su EMF (Eclipse Modeling Framework), Sirius ed Acceleo, per automatizzare la stesura dei testbench. Si comincia con una presentazione di alcuni strumenti utilizzati nella verifica, quali Verilog, SystemVerilog ed UVM, seguita da una presentazione dell'insieme di strumenti che si possono utilizzare per la generazione automatica di codice. In particolare, EMF (Eclipse Modeling Framework), Sirius ed Acceleo. L'elaborato si conclude con una discussione sull'utilizzo degli strumenti nel progetto sviluppato durante il tirocinio in azienda.Verifying complex digital devices requires developing testbenches of ever growing complexity, whose creation and maintenance times keep increasing. UVM (Universal Verification Methodology) was introduced by the industry to allow the abstraction of the verification environment and, at the same time, increase reusability. Testbench creation remains complex and time consuming. This dissertation explores a possible strategy, based on EMF (Eclipse Modeling Framework), Sirius and Acceleo, for automating testbench generation. The work begins with an introduction of some of the state-of-the-art tools used in verification, i.e. Verilog, SystemVerilog and UVM, followed by an introduction to a set of tools that can be used for automatic code generation. In particular, EMF (Eclipse Modeling Framework), Sirius ed Acceleo. The dissertation concludes with a discussion on the use of the tools for a project developed during the internship