AdaCore Blog

19 entries tagged with #virtual

by Thijs Dreef

Designing a WebAssembly toolchain for Ada/SPARK

WebAssembly (Wasm) is a binary instruction format for a stack-based virtual machine, which was designed as a portable compilation target for programming languages. Wasm can be executed in browsers, native runtimes and embedded contexts.The goal of my six-month internship at AdaCore was to draft a design for a toolchain that would support an Ada/SPARK workflow to WebAssembly. In this blog post the drafted design is introduced and discussed.

by Vadim Godunko

VSS: Cursors, Iterators and Markers

The VSS (as an abbre­vi­a­tion for Vir­tu­al String Sub­sys­tem) library is designed to pro­vide advanced string and text pro­cess­ing capa­bil­i­ties. It offers a con­ve­nient and robust API that allows devel­op­ers to work with Uni­code text, regard­less of its inter­nal rep­re­sen­ta­tion. Last time we provided overview of the library, and in this arti­cle, we will introduce concepts of cursors that are used to iterate, retrieve, and modify text data.

#vss    #Unicode    #strings    #Libraries   

by Maxim Reznik

Introduction to VSS library

The VSS (as an abbre­vi­a­tion for Vir­tu­al String Sub­sys­tem) library is designed to pro­vide advanced string and text pro­cess­ing capa­bil­i­ties. It offers a con­ve­nient and robust API that allows devel­op­ers to work with Uni­code text, regard­less of its inter­nal rep­re­sen­ta­tion. In this arti­cle, we will intro­duce you to the library and explain its pur­pose, high­light­ing its use­ful­ness for devel­op­ers work­ing in this area.

#Unicode    #strings    #Libraries    #vss   

by Fabien Chouteau

Embedded Ada/SPARK, There's a Shortcut

For years in this blog my colleagues and I have published examples, demos, and how-to’s on Ada/SPARK embedded (as in bare-metal) development. Most of the time, if not always, we focused on one way of doing things: to start from scratch and write everything in Ada/SPARK, from the low level drivers to the application. While this way of doing Ada/SPARK embedded will yield the best results in terms of software quality, it might not be the most efficient in all cases. In this blog post I want to present an alternative method to introduce Ada/SPARK into your embedded development projects.

#Embedded   

by Paul Butcher

Join us at the High Integrity Software (HIS) Conference 2022!

After two years of virtual events, we are very happy to report that the High Integrity Software Conference (HIS) will be making a physical comeback on Tuesday 11th October 2022 at the Bristol Marriott Hotel City Centre, Bristol, UK. Since 2014, AdaCore has been co-organising the event with Capgemini Engineering (previously known as Altran Technologies, SA). The success and growth of the conference have ensured it remains a regular fixture for returning delegates, and the exciting lineup for this year's event will ensure HIS 2022 is no exception!

by Jon Andrew

CuBit: A General-Purpose Operating System in SPARK/Ada

Last year, I started evaluating programming languages for a formally-verified operating system. I've been developing software for a while, but only recently began work in high integrity software development and formal methods. There are several operating system projects, like the SeL4 microkernel and the Muen separation kernel, that make use of formal verification. But I was interested in using a formally-verified language to write a general-purpose OS - an environment for abstracting the underlying hardware while acting as an arbiter for running the normal applications we're used to.

by Yannick Moy

Muen Separation Kernel Written in SPARK

The University of Applied Sciences Rapperswil in Switzerland has released last week an open-source separation kernel written in SPARK, which has been proved free from run-time errors. This project is part of the secure multilevel workstation project by Secunet, a German security company, which is using SPARK and Isabelle to create the next generation of secure workstations providing different levels of security to government employees and military personnel. I present why I think this project is worth following closely.

#Language    #Formal Verification    #SPARK