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Documents authored by Souyris, Jean

Document
DOI: 10.4230/OASIcs.PPES.2011.59
Towards Formally Verified Optimizing Compilation in Flight Control Software

Authors: Ricardo Bedin França, Denis Favre-Felix, Xavier Leroy, Marc Pantel, and Jean Souyris

Published in: OASIcs, Volume 18, Bringing Theory to Practice: Predictability and Performance in Embedded Systems (2011)

Abstract
This work presents a preliminary evaluation of the use of the CompCert formally specified and verified optimizing compiler for the development of level A critical flight control software. First, the motivation for choosing CompCert is presented, as well as the requirements and constraints for safety-critical avionics software. The main point is to allow optimized code generation by relying on the formal proof of correctness instead of the current un-optimized generation required to produce assembly code structurally similar to the algorithmic language (and even the initial models) source code. The evaluation of its performance (measured using WCET) is presented and the results are compared to those obtained with the currently used compiler. Finally, the paper discusses verification and certification issues that are raised when one seeks to use CompCert for the development of such critical software.
Cite as

Ricardo Bedin França, Denis Favre-Felix, Xavier Leroy, Marc Pantel, and Jean Souyris. Towards Formally Verified Optimizing Compilation in Flight Control Software. In Bringing Theory to Practice: Predictability and Performance in Embedded Systems. Open Access Series in Informatics (OASIcs), Volume 18, pp. 59-68, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2011)

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@InProceedings{franca_et_al:OASIcs.PPES.2011.59,
  author =	{Fran\c{c}a, Ricardo Bedin and Favre-Felix, Denis and Leroy, Xavier and Pantel, Marc and Souyris, Jean},
  title =	{{Towards Formally Verified Optimizing Compilation in Flight Control Software}},
  booktitle =	{Bringing Theory to Practice: Predictability and Performance in Embedded Systems},
  pages =	{59--68},
  series =	{Open Access Series in Informatics (OASIcs)},
  ISBN =	{978-3-939897-28-6},
  ISSN =	{2190-6807},
  year =	{2011},
  volume =	{18},
  editor =	{Lucas, Philipp and Wilhelm, Reinhard},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/OASIcs.PPES.2011.59},
  URN =		{urn:nbn:de:0030-drops-30824},
  doi =		{10.4230/OASIcs.PPES.2011.59},
  annote =	{Keywords: Compiler verification, avionics software, WCET, code optimization}
}
Document
DOI: 10.4230/OASIcs.WCET.2010.89
WCET Computation of Safety-Critical Avionics Programs: Challenges, Achievements and Perspectives

Authors: Jean Souyris

Published in: OASIcs, Volume 15, 10th International Workshop on Worst-Case Execution Time Analysis (WCET 2010)

Abstract
Time-critical avionics software products must compute their output in due time. If it is not the case, the safety of the avionics systems to which they belong might be affected. Consequently, the Worst Case Excution Time of the tasks of such programs must be computed safely, i.e., they must not be under-estimated. Since computing the exact WCET of a real-size software product task is not possible (undecidability), "safe WCET" means over-estimated WCET. Here we have an industrial issue in the sense that too over-estimating the WCET leads to a waste of CPU power. Hence, the computation a safe and precise WCET is the big challenge. Solutions to that problem cannot only rely on the technique for computing the WCET. Indeed, both hardware and software must be designed to be as deterministic as possible. For its Flight controls software products, Airbus has always been applying these principles but, since the A380, the use of more complex processors required to move from a technique based on measurements to a new one based on static analysis by Abstract Interpretation. Another kind of avionics applications are the so-called High-performance avionics software products, which are significantly less affected by - rare - delays in the computation of their outputs. In this case, the need for a "safe WCET" is less strong, hence opening the door to different other ways of computing it. In this context, the aim of the talk is to present the challenge of computing WCET in Airbus's industrial context, the achievements in this field and the evocation of some trends and perspectives.
Cite as

Jean Souyris. WCET Computation of Safety-Critical Avionics Programs: Challenges, Achievements and Perspectives. In 10th International Workshop on Worst-Case Execution Time Analysis (WCET 2010). Open Access Series in Informatics (OASIcs), Volume 15, p. 89, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2010)

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@InProceedings{souyris:OASIcs.WCET.2010.89,
  author =	{Souyris, Jean},
  title =	{{WCET Computation of Safety-Critical Avionics Programs: Challenges, Achievements and Perspectives}},
  booktitle =	{10th International Workshop on Worst-Case Execution Time Analysis (WCET 2010)},
  pages =	{89--89},
  series =	{Open Access Series in Informatics (OASIcs)},
  ISBN =	{978-3-939897-21-7},
  ISSN =	{2190-6807},
  year =	{2010},
  volume =	{15},
  editor =	{Lisper, Bj\"{o}rn},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/OASIcs.WCET.2010.89},
  URN =		{urn:nbn:de:0030-drops-28284},
  doi =		{10.4230/OASIcs.WCET.2010.89},
  annote =	{Keywords: WCET analysis, avionics software, safety-critical system}
}
Document
DOI: 10.4230/OASIcs.WCET.2005.810
Computing the Worst Case Execution Time of an Avionics Program by Abstract Interpretation

Authors: Jean Souyris, Erwan Le Pavec, Guillaume Himbert, Guillaume Borios, Victor Jégu, and Reinhold Heckmann

Published in: OASIcs, Volume 1, 5th International Workshop on Worst-Case Execution Time Analysis (WCET'05) (2007)

Abstract
This paper presents how the timing analyser aiT is used for computing the Worst-Case Execution Time (WCET) of two safety-critical avionics programs. The aiT tool has been developed by AbsInt GmbH as a static analyser based on Abstract Interpretation
Cite as

Jean Souyris, Erwan Le Pavec, Guillaume Himbert, Guillaume Borios, Victor Jégu, and Reinhold Heckmann. Computing the Worst Case Execution Time of an Avionics Program by Abstract Interpretation. In 5th International Workshop on Worst-Case Execution Time Analysis (WCET'05). Open Access Series in Informatics (OASIcs), Volume 1, pp. 21-24, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2008)

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@InProceedings{souyris_et_al:OASIcs.WCET.2005.810,
  author =	{Souyris, Jean and Le Pavec, Erwan and Himbert, Guillaume and Borios, Guillaume and J\'{e}gu, Victor and Heckmann, Reinhold},
  title =	{{Computing the Worst Case Execution Time of an Avionics Program by Abstract Interpretation}},
  booktitle =	{5th International Workshop on Worst-Case Execution Time Analysis (WCET'05)},
  pages =	{21--24},
  series =	{Open Access Series in Informatics (OASIcs)},
  ISBN =	{978-3-939897-24-8},
  ISSN =	{2190-6807},
  year =	{2008},
  volume =	{1},
  editor =	{Wilhelm, Reinhard},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/OASIcs.WCET.2005.810},
  URN =		{urn:nbn:de:0030-drops-8103},
  doi =		{10.4230/OASIcs.WCET.2005.810},
  annote =	{Keywords: }
}
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