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DOI: 10.4230/LIPIcs.ECOOP.2024.13

Pure Methods for roDOT

Authors: Vlastimil Dort, Yufeng Li, Ondřej Lhoták, and Pavel Parízek

Published in: LIPIcs, Volume 313, 38th European Conference on Object-Oriented Programming (ECOOP 2024)

Abstract

Object-oriented programming languages typically allow mutation of objects, but pure methods are common too. There is great interest in recognizing which methods are pure, because it eases analysis of program behavior and allows modifying the program without changing its behavior. The roDOT calculus is a formal calculus extending DOT with reference mutability. In this paper, we explore purity conditions in roDOT and pose a SEF guarantee, by which the type system guarantees that methods of certain types are side-effect free. We use the idea from ReIm to detect pure methods by argument types. Applying this idea to roDOT required just a few changes to the type system, but necessitated re-working a significant part of the soundness proof. In addition, we state a transformation guarantee, which states that in a roDOT program, calls to SEF methods can be safely reordered without changing the outcome of the program. We proved type soundness of the updated roDOT calculus, using multiple layers of typing judgments. We proved the SEF guarantee by applying the Immutability guarantee, and the transformation guarantee by applying the SEF guarantee within a framework for reasoning about safe transformations of roDOT programs. All proofs are mechanized in Coq.

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Vlastimil Dort, Yufeng Li, Ondřej Lhoták, and Pavel Parízek. Pure Methods for roDOT. In 38th European Conference on Object-Oriented Programming (ECOOP 2024). Leibniz International Proceedings in Informatics (LIPIcs), Volume 313, pp. 13:1-13:29, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2024)

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@InProceedings{dort_et_al:LIPIcs.ECOOP.2024.13,
  author =	{Dort, Vlastimil and Li, Yufeng and Lhot\'{a}k, Ond\v{r}ej and Par{\'\i}zek, Pavel},
  title =	{{Pure Methods for roDOT}},
  booktitle =	{38th European Conference on Object-Oriented Programming (ECOOP 2024)},
  pages =	{13:1--13:29},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-341-6},
  ISSN =	{1868-8969},
  year =	{2024},
  volume =	{313},
  editor =	{Aldrich, Jonathan and Salvaneschi, Guido},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ECOOP.2024.13},
  URN =		{urn:nbn:de:0030-drops-208624},
  doi =		{10.4230/LIPIcs.ECOOP.2024.13},
  annote =	{Keywords: type systems, DOT calculus, pure methods}
}

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Artifact

DOI: 10.4230/DARTS.10.2.6

Pure Methods for roDOT (Artifact)

Authors: Vlastimil Dort, Yufeng Li, Ondřej Lhoták, and Pavel Parízek

Published in: DARTS, Volume 10, Issue 2, Special Issue of the 38th European Conference on Object-Oriented Programming (ECOOP 2024)

Abstract

The artifact for the paper Pure methods for roDOT (ECOOP 2024) contains the Coq mechanization of the theorems appearing in the paper, and the necessary definitions and lemmata. Additionally, the artifact contains a mechanization of the roDOT calculus presented in an earlier paper Reference mutability for DOT (ECOOP 2020). We used the calculus from this paper as the baseline for our paper, but it has not been mechanized before. The functionality of the artifact is the ability to verify the correctness of the theorems by running Coq. Our code is based on a mechanization of a soundness proof for Field Mutable DOT.

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Vlastimil Dort, Yufeng Li, Ondřej Lhoták, and Pavel Parízek. Pure Methods for roDOT (Artifact). In Special Issue of the 38th European Conference on Object-Oriented Programming (ECOOP 2024). Dagstuhl Artifacts Series (DARTS), Volume 10, Issue 2, pp. 6:1-6:8, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2024)

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@Article{dort_et_al:DARTS.10.2.6,
  author =	{Dort, Vlastimil and Li, Yufeng and Lhot\'{a}k, Ond\v{r}ej and Par{\'\i}zek, Pavel},
  title =	{{Pure Methods for roDOT (Artifact)}},
  pages =	{6:1--6:8},
  journal =	{Dagstuhl Artifacts Series},
  ISBN =	{978-3-95977-342-3},
  ISSN =	{2509-8195},
  year =	{2024},
  volume =	{10},
  number =	{2},
  editor =	{Dort, Vlastimil and Li, Yufeng and Lhot\'{a}k, Ond\v{r}ej and Par{\'\i}zek, Pavel},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DARTS.10.2.6},
  URN =		{urn:nbn:de:0030-drops-209046},
  doi =		{10.4230/DARTS.10.2.6},
  annote =	{Keywords: type systems, DOT calculus, pure methods}
}

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Pure Methods for roDOT

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