Middleware is an integral part of critical software, middleware provides core services for data exchange and manipulation, job execution, and scheduling. Their correctness is central to the correct execution of the software. They must be carefully configured to meet all functional and non-functional requirements. From a set of valid configuration parameters, one then has to demonstrate the implementation is correct and can fulfill its mission. Model-based techniques provide the foundations for correct-by-construction engineering. Most notably, they can be used to model a system, assess its configuration is correct, and then generate the corresponding middleware instance. The SAE AADL language supports the modeling of safety-critical systems and covers its design, configuration, and analysis. In this paper, we present several contributions: the definition of a model of computation aligned with the Ada Ravenscar profile supported by an architectural model expressed using the AADL; derivations rules from AADL constructs to middleware services using Ada 2012 and SPARK2014, and the proof of correctness of the implementation. Our contribution illustrates how one can prove the absence of runtime errors in middleware configured from high-level descriptions. This effort illustrates the positive effect models, programming languages and associated toolsets have on developing high-assurance middleware.

A correct-by-construction AADL runtime, proof of a safety-critical middleware using SPARK/Ada

**Session chair:** Laurent Pautet  

**Title:** A correct-by-construction AADL runtime, proof of a safety-critical middleware using SPARK/Ada   
**Author:** Jerome Hugues   
**Presenting author:** Jerome Hugues      
  
**Title:** AdaMM: A precompiler for memory model aware programming on higher language level    
**Authors:** Johann Blieberger   
**Presenting author:** Johann Blieberger       
   
**Title:** More Ada in non-Ada systems   
**Author:** Ahlan Marriott   
**Presenting author:** Ahlan Marriott   

**Title:** PTC Ada and Real-Time Java Solutions     
**Authors:** Shawn Fanning and Marie Daub   
**Presenting author:** Shawn Fanning   

Technical Session 4: Ada issues and Ravenscar

technical paper

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### Welcome Message from our Co-Chairs

Through this message, we want to give you our warmest welcome to the 25th Ada-Europe International Conference on Reliable Software Technologies (AEiC 2021). The special circumstances we all go through have made the conference a virtual event. Nonetheless, this will allow us to take advantage of the benefits of this format by using the Underline.io platform that allows remote participation of speakers and attendees and a virtual exhibition.
The platform will also provide a virtual space through Gather.Town to facilitate social interaction among participants, which, in addition to presenting state of the art research results, is one of the most important goals of a conference. This platform will hold various social events together with breaks and a poster session. 

The conference schedule includes a four-day program and exhibition from Monday to Thursday, with parallel tutorials on Monday, and keynotes, technical sessions and a Work-in-Progress session on the remaining three days. The technical sessions include the presentations of 13 journal-track papers, 5 industrial presentations and 6 invited talks on leading topics on reliable software technologies. The program will be completed with three outstanding keynotes that will delight the participants.

The main conference activities will be from 13:00 to 18:00 Central European Summer Time (CEST) to allow participants from America to Central Asia to attend to the conference sessions. Virtual social events are scheduled at the beginning and the end of each day. We encourage you to participate in these activities as well as visiting the exhibition. We look forward to meeting you virtually in June 2021!

**J. Javier Gutiérrez and Mario Aldea Rivas**
 // AEiC 2021 Program Co-Chairs

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Jerome Hugues

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A correct-by-construction AADL runtime, proof of a safety-critical middleware using SPARK/Ada

A correct-by-construction AADL runtime, proof of a safety-critical middleware using SPARK/Ada

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