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Documents authored by Nicolay, Jens

Document
DOI: 10.4230/LIPIcs.CP.2025.16
PrintTalk: A Language for Constraint-Based 3D Modelling

Authors: Jef Jacobs, Wolfgang De Meuter, and Jens Nicolay

Published in: LIPIcs, Volume 340, 31st International Conference on Principles and Practice of Constraint Programming (CP 2025)

Abstract
Programmatic CAD (PCAD) is an emerging alternative to traditional visual CAD software. However, state-of-the-art PCAD tools have limited or no support for constraints. Consequently, these tools depend solely on parametrisation for variability, reusability, and composition of shapes. This leads to problems such as parameter explosion, leaky compositional abstraction, and prevents a declarative approach to defining spatial patterns (linear, grid, circular, etc.) for the constituents of a composition. This paper describes the design of PrintTalk, a PCAD language that supports 3D modelling by composing shapes and expressing relations between them using first-class constraints. Evaluating PrintTalk against state-of-the-art PCAD tools demonstrates that its expressive abstraction and composition mechanisms facilitate the design and promotes the reuse of shapes.
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Jef Jacobs, Wolfgang De Meuter, and Jens Nicolay. PrintTalk: A Language for Constraint-Based 3D Modelling. In 31st International Conference on Principles and Practice of Constraint Programming (CP 2025). Leibniz International Proceedings in Informatics (LIPIcs), Volume 340, pp. 16:1-16:22, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2025)

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@InProceedings{jacobs_et_al:LIPIcs.CP.2025.16,
  author =	{Jacobs, Jef and De Meuter, Wolfgang and Nicolay, Jens},
  title =	{{PrintTalk: A Language for Constraint-Based 3D Modelling}},
  booktitle =	{31st International Conference on Principles and Practice of Constraint Programming (CP 2025)},
  pages =	{16:1--16:22},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-380-5},
  ISSN =	{1868-8969},
  year =	{2025},
  volume =	{340},
  editor =	{de la Banda, Maria Garcia},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.CP.2025.16},
  URN =		{urn:nbn:de:0030-drops-238775},
  doi =		{10.4230/LIPIcs.CP.2025.16},
  annote =	{Keywords: Programmatic 3D Modelling, PCAD, Domain specific language, Constraints}
}
Document
DOI: 10.4230/DARTS.3.2.11
Mailbox Abstractions for Static Analysis of Actor Programs (Artifact)

Authors: Quentin Stiévenart, Jens Nicolay, Wolfgang De Meuter, and Coen De Roover

Published in: DARTS, Volume 3, Issue 2, Special Issue of the 31st European Conference on Object-Oriented Programming (ECOOP 2017)

Abstract
This artifact is based on Scala-AM, a static analysis framework relying on the Abstracting Abstract Machines approach. This version of the framework is extended to support actor-based programs, written in a variant of Scheme. The sound static analysis is performed in order to verify the absence of errors in actor-based program, and to compute upper bounds on actor's mailboxes. We developed several mailbox abstractions with which the static analysis can be run, and evaluate the precision of the technique with these mailbox abstractions. This artifact contains documentation on how to use analysis and on how to reproduce the results presented in the companion paper.
Cite as

Quentin Stiévenart, Jens Nicolay, Wolfgang De Meuter, and Coen De Roover. Mailbox Abstractions for Static Analysis of Actor Programs (Artifact). In Special Issue of the 31st European Conference on Object-Oriented Programming (ECOOP 2017). Dagstuhl Artifacts Series (DARTS), Volume 3, Issue 2, pp. 11:1-11:2, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2017)

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@Article{stievenart_et_al:DARTS.3.2.11,
  author =	{Sti\'{e}venart, Quentin and Nicolay, Jens and De Meuter, Wolfgang and De Roover, Coen},
  title =	{{Mailbox Abstractions for Static Analysis of Actor Programs (Artifact)}},
  pages =	{11:1--11:2},
  journal =	{Dagstuhl Artifacts Series},
  ISSN =	{2509-8195},
  year =	{2017},
  volume =	{3},
  number =	{2},
  editor =	{Sti\'{e}venart, Quentin and Nicolay, Jens and De Meuter, Wolfgang and De Roover, Coen},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DARTS.3.2.11},
  URN =		{urn:nbn:de:0030-drops-72920},
  doi =		{10.4230/DARTS.3.2.11},
  annote =	{Keywords: static analysis, abstraction, abstract interpretation, actors, mailbox}
}
Document
DOI: 10.4230/LIPIcs.ECOOP.2017.25
Mailbox Abstractions for Static Analysis of Actor Programs

Authors: Quentin Stiévenart, Jens Nicolay, Wolfgang De Meuter, and Coen De Roover

Published in: LIPIcs, Volume 74, 31st European Conference on Object-Oriented Programming (ECOOP 2017)

Abstract
Properties such as the absence of errors or bounds on mailbox sizes are hard to deduce statically for actor-based programs. This is because actor-based programs exhibit several sources of unboundedness, in addition to the non-determinism that is inherent to the concurrent execution of actors. We developed a static technique based on abstract interpretation to soundly reason in a finite amount of time about the possible executions of an actor-based program. We use our technique to statically verify the absence of errors in actor-based programs, and to compute upper bounds on the actors' mailboxes. Sound abstraction of these mailboxes is crucial to the precision of any such technique. We provide several mailbox abstractions and categorize them according to the extent to which they preserve message ordering and multiplicity of messages in a mailbox. We formally prove the soundness of each mailbox abstraction, and empirically evaluate their precision and performance trade-offs on a corpus of benchmark programs. The results show that our technique can statically verify the absence of errors for more benchmark programs than the state-of-the-art analysis.
Cite as

Quentin Stiévenart, Jens Nicolay, Wolfgang De Meuter, and Coen De Roover. Mailbox Abstractions for Static Analysis of Actor Programs. In 31st European Conference on Object-Oriented Programming (ECOOP 2017). Leibniz International Proceedings in Informatics (LIPIcs), Volume 74, pp. 25:1-25:30, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2017)

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@InProceedings{stievenart_et_al:LIPIcs.ECOOP.2017.25,
  author =	{Sti\'{e}venart, Quentin and Nicolay, Jens and De Meuter, Wolfgang and De Roover, Coen},
  title =	{{Mailbox Abstractions for Static Analysis of Actor Programs}},
  booktitle =	{31st European Conference on Object-Oriented Programming (ECOOP 2017)},
  pages =	{25:1--25:30},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-035-4},
  ISSN =	{1868-8969},
  year =	{2017},
  volume =	{74},
  editor =	{M\"{u}ller, Peter},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ECOOP.2017.25},
  URN =		{urn:nbn:de:0030-drops-72541},
  doi =		{10.4230/LIPIcs.ECOOP.2017.25},
  annote =	{Keywords: static analysis, abstraction, abstract interpretation, actors, mailbox}
}
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