12 Search Results for "Vafeiadis, Viktor"

Document
Invited Talk
DOI: 10.4230/LIPIcs.CONCUR.2022.2
Concurrent Separation Logics: Logical Abstraction, Logical Atomicity and Environment Liveness Conditions (Invited Talk)

Authors: Philippa Gardner

Published in: LIPIcs, Volume 243, 33rd International Conference on Concurrency Theory (CONCUR 2022)

Abstract
Scalable verification for concurrent programs with shared memory is a long-standing, difficult problem. In 2004, O'Hearn and Brookes introduced concurrent separation logic to provide compositional reasoning about coarse-grained concurrent programs with synchronisation primitives (Gödel prize, 2016). In 2010, I introduced logical abstraction (the fiction of separation) to CSL, developing the CAP logic for reasoning about fine-grained concurrent programs in general and fine-grained lock algorithms in particular. In one logic, it was possible to provide two-sided specifications of concurrent operations, with formally verified implementations and clients. In 2014, I introduced logical atomicity (the fiction of atomicity) to concurrent separation logics, developing the TaDA logic to capture when individual operations behave atomically. Unlike CAP, where synchronisation primitives leak into the specifications, with TaDA the specifications are "just right" in that they provide more general atomic functions specifications to capture, for example, the full behaviour of lock operations. In 2021, I introduced environment liveness conditions to concurrent separation logics, developing the TaDA Live logic for reasoning compositionally about the termination of blocking fine-grained concurrent programs. The crucial challenge is how to deal with abstract atomic blocking: that is, abstract atomic operations that have blocking behaviour arising from busy-waiting patterns as found in, for example, fine-grained spin locks. The fundamental innovation is with the design of abstract specifications that capture this blocking behaviour as liveness assumptions on the environment. In this talk, I will explain this on-going journey in the wonderful world of concurrent separation logics. I will also explain why I have a bright green office chair in the corner of my office, patterned in gold lamé. Many thanks to my fabulous coauthors on concurrent separation logics: Thomas Dinsdale-Young, Emanuele D'Osualdo, Mike Dodds, Azadeh Farzan, Matthew Parkinson, Pedro da Rocha Pinto, Julian Sutherland, Viktor Vafeiadis and more. Suggested Reading: - Peter O'Hearn: Resources, Concurrency and Local Reasoning, Journal of Theoretical Computer Science, Festschrift for John C Reynolds 70th birthday, 2007. - Thomas Dinsdale-Young, Pedro da Rocha Pinto and Philippa Gardner: A Perspective on Specifying and Verifying Concurrent Modules, Journal of Logical and Algebraic Methods in Programming, 2018. - Emanuele D'Osualdo, Azadeh Farzan, Philippa Gardner and Julian Sutherland: TaDA Live: Compositional Reasoning for Termination of Fine-grained Concurrent Programs, ACM Transactions on Programming Languages and Systems (TOPLAS), 2021.
Cite as

Philippa Gardner. Concurrent Separation Logics: Logical Abstraction, Logical Atomicity and Environment Liveness Conditions (Invited Talk). In 33rd International Conference on Concurrency Theory (CONCUR 2022). Leibniz International Proceedings in Informatics (LIPIcs), Volume 243, p. 2:1, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2022)

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@InProceedings{gardner:LIPIcs.CONCUR.2022.2,
  author =	{Gardner, Philippa},
  title =	{{Concurrent Separation Logics: Logical Abstraction, Logical Atomicity and Environment Liveness Conditions}},
  booktitle =	{33rd International Conference on Concurrency Theory (CONCUR 2022)},
  pages =	{2:1--2:1},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-246-4},
  ISSN =	{1868-8969},
  year =	{2022},
  volume =	{243},
  editor =	{Klin, Bartek and Lasota, S{\l}awomir and Muscholl, Anca},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.CONCUR.2022.2},
  URN =		{urn:nbn:de:0030-drops-170659},
  doi =		{10.4230/LIPIcs.CONCUR.2022.2},
  annote =	{Keywords: Concurrent separation logic}
}
Document
Artifact
DOI: 10.4230/DARTS.8.2.3
Compiling Volatile Correctly in Java (Artifact)

Authors: Shuyang Liu, John Bender, and Jens Palsberg

Published in: DARTS, Volume 8, Issue 2, Special Issue of the 36th European Conference on Object-Oriented Programming (ECOOP 2022)

Abstract
The compilation scheme for Volatile accesses in the OpenJDK 9 HotSpot Java Virtual Machine has a major problem that persists despite a recent bug report and a long discussion. One of the suggested fixes is to let Java compile Volatile accesses in the same way as C/C++11. However, we show that this approach is invalid for Java. Indeed, we show a set of optimizations that is valid for C/C++11 but invalid for Java, while the compilation scheme is similar. We prove the correctness of the compilation scheme to Power and x86 and a suite of valid optimizations in Java. Our proofs are based on a language model that we validate by proving key properties such as the DRF-SC theorem and by running litmus tests via our implementation of Java in Herd7.
Cite as

Shuyang Liu, John Bender, and Jens Palsberg. Compiling Volatile Correctly in Java (Artifact). In Special Issue of the 36th European Conference on Object-Oriented Programming (ECOOP 2022). Dagstuhl Artifacts Series (DARTS), Volume 8, Issue 2, pp. 3:1-3:2, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2022)

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@Article{liu_et_al:DARTS.8.2.3,
  author =	{Liu, Shuyang and Bender, John and Palsberg, Jens},
  title =	{{Compiling Volatile Correctly in Java (Artifact)}},
  pages =	{3:1--3:2},
  journal =	{Dagstuhl Artifacts Series},
  ISSN =	{2509-8195},
  year =	{2022},
  volume =	{8},
  number =	{2},
  editor =	{Liu, Shuyang and Bender, John and Palsberg, Jens},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DARTS.8.2.3},
  URN =		{urn:nbn:de:0030-drops-162018},
  doi =		{10.4230/DARTS.8.2.3},
  annote =	{Keywords: formal semantics, concurrency, compilation}
}
Document
DOI: 10.4230/LIPIcs.ECOOP.2022.6
Compiling Volatile Correctly in Java

Authors: Shuyang Liu, John Bender, and Jens Palsberg

Published in: LIPIcs, Volume 222, 36th European Conference on Object-Oriented Programming (ECOOP 2022)

Abstract
The compilation scheme for Volatile accesses in the OpenJDK 9 HotSpot Java Virtual Machine has a major problem that persists despite a recent bug report and a long discussion. One of the suggested fixes is to let Java compile Volatile accesses in the same way as C/C++11. However, we show that this approach is invalid for Java. Indeed, we show a set of optimizations that is valid for C/C++11 but invalid for Java, while the compilation scheme is similar. We prove the correctness of the compilation scheme to Power and x86 and a suite of valid optimizations in Java. Our proofs are based on a language model that we validate by proving key properties such as the DRF-SC theorem and by running litmus tests via our implementation of Java in Herd7.
Cite as

Shuyang Liu, John Bender, and Jens Palsberg. Compiling Volatile Correctly in Java. In 36th European Conference on Object-Oriented Programming (ECOOP 2022). Leibniz International Proceedings in Informatics (LIPIcs), Volume 222, pp. 6:1-6:26, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2022)

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@InProceedings{liu_et_al:LIPIcs.ECOOP.2022.6,
  author =	{Liu, Shuyang and Bender, John and Palsberg, Jens},
  title =	{{Compiling Volatile Correctly in Java}},
  booktitle =	{36th European Conference on Object-Oriented Programming (ECOOP 2022)},
  pages =	{6:1--6:26},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-225-9},
  ISSN =	{1868-8969},
  year =	{2022},
  volume =	{222},
  editor =	{Ali, Karim and Vitek, Jan},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ECOOP.2022.6},
  URN =		{urn:nbn:de:0030-drops-162346},
  doi =		{10.4230/LIPIcs.ECOOP.2022.6},
  annote =	{Keywords: formal semantics, concurrency, compilation}
}
Document
Invited Talk
DOI: 10.4230/LIPIcs.CALCO.2021.4
The Challenges of Weak Persistency (Invited Talk)

Authors: Viktor Vafeiadis

Published in: LIPIcs, Volume 211, 9th Conference on Algebra and Coalgebra in Computer Science (CALCO 2021)

Abstract
Non-volatile memory (NVM) is a new hardware technology that provides durable storage at performance similar to that of plain volatile RAM. As such, there is a lot of interest in exploiting this technology to improve the performance of existing disk-bound applications and to find new applications for it. Nevertheless, developing correct programs that interact with non-volatile memory is by no means easy, since mainstream architectures provide rather weak persistency semantics and rather low-level and expensive mechanisms in order to avoid weak behaviors. This creates many opportunities for researchers in programming language semantics, logic, and verification to develop techniques to assist programmers writing NVM programs. This short paper and the associated talk outline the challenges caused by NVM and the research opportunities for PL researchers.
Cite as

Viktor Vafeiadis. The Challenges of Weak Persistency (Invited Talk). In 9th Conference on Algebra and Coalgebra in Computer Science (CALCO 2021). Leibniz International Proceedings in Informatics (LIPIcs), Volume 211, pp. 4:1-4:3, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2021)

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@InProceedings{vafeiadis:LIPIcs.CALCO.2021.4,
  author =	{Vafeiadis, Viktor},
  title =	{{The Challenges of Weak Persistency}},
  booktitle =	{9th Conference on Algebra and Coalgebra in Computer Science (CALCO 2021)},
  pages =	{4:1--4:3},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-212-9},
  ISSN =	{1868-8969},
  year =	{2021},
  volume =	{211},
  editor =	{Gadducci, Fabio and Silva, Alexandra},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.CALCO.2021.4},
  URN =		{urn:nbn:de:0030-drops-153593},
  doi =		{10.4230/LIPIcs.CALCO.2021.4},
  annote =	{Keywords: Weak Persistency, Non-Volatile Memory}
}
Document
Artifact
DOI: 10.4230/DARTS.6.2.4
Reconciling Event Structures with Modern Multiprocessors (Artifact)

Authors: Evgenii Moiseenko, Anton Podkopaev, Ori Lahav, Orestis Melkonian, and Viktor Vafeiadis

Published in: DARTS, Volume 6, Issue 2, Special Issue of the 34th European Conference on Object-Oriented Programming (ECOOP 2020)

Abstract
The artifact is a virtual machine image containing two Coq packages which include mechanization of proofs stated in the paper. The first package imm contains a modified version of the Intermediate Memory Model, extended with the support of sequentially consistent atomics, and the compilation correctness proofs from it to hardware models. The second package weakestmoToImm contains a definition of the Weakestmo memory model as well as a compilation correctness proof from it to IMM.
Cite as

Evgenii Moiseenko, Anton Podkopaev, Ori Lahav, Orestis Melkonian, and Viktor Vafeiadis. Reconciling Event Structures with Modern Multiprocessors (Artifact). In Special Issue of the 34th European Conference on Object-Oriented Programming (ECOOP 2020). Dagstuhl Artifacts Series (DARTS), Volume 6, Issue 2, pp. 4:1-4:3, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2020)

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@Article{moiseenko_et_al:DARTS.6.2.4,
  author =	{Moiseenko, Evgenii and Podkopaev, Anton and Lahav, Ori and Melkonian, Orestis and Vafeiadis, Viktor},
  title =	{{Reconciling Event Structures with Modern Multiprocessors (Artifact)}},
  pages =	{4:1--4:3},
  journal =	{Dagstuhl Artifacts Series},
  ISSN =	{2509-8195},
  year =	{2020},
  volume =	{6},
  number =	{2},
  editor =	{Moiseenko, Evgenii and Podkopaev, Anton and Lahav, Ori and Melkonian, Orestis and Vafeiadis, Viktor},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DARTS.6.2.4},
  URN =		{urn:nbn:de:0030-drops-132015},
  doi =		{10.4230/DARTS.6.2.4},
  annote =	{Keywords: Weak Memory Consistency, Event Structures, IMM, Weakestmo}
}
Document
DOI: 10.4230/LIPIcs.ECOOP.2020.5
Reconciling Event Structures with Modern Multiprocessors

Authors: Evgenii Moiseenko, Anton Podkopaev, Ori Lahav, Orestis Melkonian, and Viktor Vafeiadis

Published in: LIPIcs, Volume 166, 34th European Conference on Object-Oriented Programming (ECOOP 2020)

Abstract
Weakestmo is a recently proposed memory consistency model that uses event structures to resolve the infamous "out-of-thin-air" problem and to enable efficient compilation to hardware. Nevertheless, this latter property - compilation correctness - has not yet been formally established. This paper closes this gap by establishing correctness of the intended compilation schemes from Weakestmo to a wide range of formal hardware memory models (x86, POWER, ARMv7, ARMv8) in the Coq proof assistant. Our proof is the first that establishes correctness of compilation of an event-structure-based model that forbids "out-of-thin-air" behaviors, as well as the first mechanized compilation proof of a weak memory model supporting sequentially consistent accesses to such a range of hardware platforms. Our compilation proof goes via the recent Intermediate Memory Model (IMM), which we suitably extend with sequentially consistent accesses.
Cite as

Evgenii Moiseenko, Anton Podkopaev, Ori Lahav, Orestis Melkonian, and Viktor Vafeiadis. Reconciling Event Structures with Modern Multiprocessors. In 34th European Conference on Object-Oriented Programming (ECOOP 2020). Leibniz International Proceedings in Informatics (LIPIcs), Volume 166, pp. 5:1-5:26, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2020)

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@InProceedings{moiseenko_et_al:LIPIcs.ECOOP.2020.5,
  author =	{Moiseenko, Evgenii and Podkopaev, Anton and Lahav, Ori and Melkonian, Orestis and Vafeiadis, Viktor},
  title =	{{Reconciling Event Structures with Modern Multiprocessors}},
  booktitle =	{34th European Conference on Object-Oriented Programming (ECOOP 2020)},
  pages =	{5:1--5:26},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-154-2},
  ISSN =	{1868-8969},
  year =	{2020},
  volume =	{166},
  editor =	{Hirschfeld, Robert and Pape, Tobias},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ECOOP.2020.5},
  URN =		{urn:nbn:de:0030-drops-131622},
  doi =		{10.4230/LIPIcs.ECOOP.2020.5},
  annote =	{Keywords: Weak Memory Consistency, Event Structures, IMM, Weakestmo}
}
Document
DOI: 10.4230/DARTS.3.2.15
Strong Logic for Weak Memory: Reasoning About Release-Acquire Consistency in Iris (Artifact)

Authors: Jan-Oliver Kaiser, Hoang-Hai Dang, Derek Dreyer, Ori Lahav, and Viktor Vafeiadis

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

Abstract
This artifact provides the soundness proofs for the encodings in Iris the RSL and GPS logics, as well as the verification for all standard examples known to be verifiable in those logics. All of these proofs are formalized in Coq, which is the main content of this artifact. The formalization is provided in a virtual machine for the convenience of testing, but can also be built from source.
Cite as

Jan-Oliver Kaiser, Hoang-Hai Dang, Derek Dreyer, Ori Lahav, and Viktor Vafeiadis. Strong Logic for Weak Memory: Reasoning About Release-Acquire Consistency in Iris (Artifact). In Special Issue of the 31st European Conference on Object-Oriented Programming (ECOOP 2017). Dagstuhl Artifacts Series (DARTS), Volume 3, Issue 2, pp. 15:1-15:2, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2017)

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@Article{kaiser_et_al:DARTS.3.2.15,
  author =	{Kaiser, Jan-Oliver and Dang, Hoang-Hai and Dreyer, Derek and Lahav, Ori and Vafeiadis, Viktor},
  title =	{{Strong Logic for Weak Memory: Reasoning About Release-Acquire Consistency in Iris (Artifact)}},
  pages =	{15:1--15:2},
  journal =	{Dagstuhl Artifacts Series},
  ISSN =	{2509-8195},
  year =	{2017},
  volume =	{3},
  number =	{2},
  editor =	{Kaiser, Jan-Oliver and Dang, Hoang-Hai and Dreyer, Derek and Lahav, Ori and Vafeiadis, Viktor},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DARTS.3.2.15},
  URN =		{urn:nbn:de:0030-drops-72966},
  doi =		{10.4230/DARTS.3.2.15},
  annote =	{Keywords: weak memory models, release-acquire, concurrency, separation logic}
}
Document
DOI: 10.4230/LIPIcs.ECOOP.2017.17
Strong Logic for Weak Memory: Reasoning About Release-Acquire Consistency in Iris

Authors: Jan-Oliver Kaiser, Hoang-Hai Dang, Derek Dreyer, Ori Lahav, and Viktor Vafeiadis

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

Abstract
The field of concurrent separation logics (CSLs) has recently undergone two exciting developments: (1) the Iris framework for encoding and unifying advanced higher-order CSLs and formalizing them in Coq, and (2) the adaptation of CSLs to account for weak memory models, notably C11's release-acquire (RA) consistency. Unfortunately, these developments are seemingly incompatible, since Iris only applies to languages with an operational interleaving semantics, while C11 is defined by a declarative (axiomatic) semantics. In this paper, we show that, on the contrary, it is not only feasible but useful to marry these developments together. Our first step is to provide a novel operational characterization of RA+NA, the fragment of C11 containing RA accesses and "non-atomic" (normal data) accesses. Instantiating Iris with this semantics, we then derive higher-order variants of two prominent RA+NA logics, GPS and RSL. Finally, we deploy these derived logics in order to perform the first mechanical verifications (in Coq) of several interesting case studies of RA+NA programming. In a nutshell, we provide the first foundationally verified framework for proving programs correct under C11's weak-memory semantics.
Cite as

Jan-Oliver Kaiser, Hoang-Hai Dang, Derek Dreyer, Ori Lahav, and Viktor Vafeiadis. Strong Logic for Weak Memory: Reasoning About Release-Acquire Consistency in Iris. In 31st European Conference on Object-Oriented Programming (ECOOP 2017). Leibniz International Proceedings in Informatics (LIPIcs), Volume 74, pp. 17:1-17:29, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2017)

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@InProceedings{kaiser_et_al:LIPIcs.ECOOP.2017.17,
  author =	{Kaiser, Jan-Oliver and Dang, Hoang-Hai and Dreyer, Derek and Lahav, Ori and Vafeiadis, Viktor},
  title =	{{Strong Logic for Weak Memory: Reasoning About Release-Acquire Consistency in Iris}},
  booktitle =	{31st European Conference on Object-Oriented Programming (ECOOP 2017)},
  pages =	{17:1--17:29},
  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.2017.17},
  URN =		{urn:nbn:de:0030-drops-72753},
  doi =		{10.4230/LIPIcs.ECOOP.2017.17},
  annote =	{Keywords: Weak memory models, release-acquire, concurrency, separation logic}
}
Document
DOI: 10.4230/LIPIcs.ECOOP.2017.22
Promising Compilation to ARMv8 POP

Authors: Anton Podkopaev, Ori Lahav, and Viktor Vafeiadis

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

Abstract
We prove the correctness of compilation of relaxed memory accesses and release-acquire fences from the "promising" semantics of [Kang et al. POPL'17] to the ARMv8 POP machine of [Flur et al. POPL'16]. The proof is highly non-trivial because both the ARMv8 POP and the promising semantics provide some extremely weak consistency guarantees for normal memory accesses; however, they do so in rather different ways. Our proof of compilation correctness to ARMv8 POP strengthens the results of the Kang et al., who only proved the correctness of compilation to x86-TSO and Power, which are much simpler in comparison to ARMv8 POP.
Cite as

Anton Podkopaev, Ori Lahav, and Viktor Vafeiadis. Promising Compilation to ARMv8 POP. In 31st European Conference on Object-Oriented Programming (ECOOP 2017). Leibniz International Proceedings in Informatics (LIPIcs), Volume 74, pp. 22:1-22:28, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2017)

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@InProceedings{podkopaev_et_al:LIPIcs.ECOOP.2017.22,
  author =	{Podkopaev, Anton and Lahav, Ori and Vafeiadis, Viktor},
  title =	{{Promising Compilation to ARMv8 POP}},
  booktitle =	{31st European Conference on Object-Oriented Programming (ECOOP 2017)},
  pages =	{22:1--22:28},
  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.2017.22},
  URN =		{urn:nbn:de:0030-drops-72667},
  doi =		{10.4230/LIPIcs.ECOOP.2017.22},
  annote =	{Keywords: ARM, Compilation Correctness, Weak Memory Model}
}
Document
DOI: 10.4230/DagRep.5.11.1
Verification of Evolving Graph Structures (Dagstuhl Seminar 15451)

Authors: Parosh Aziz Abdulla, Fabio Gadducci, Barbara König, and Viktor Vafeiadis

Published in: Dagstuhl Reports, Volume 5, Issue 11 (2016)

Abstract
This report documents the programme and the outcome of Dagstuhl Seminar 15451 "Verification of Evolving Graph Structures". The aim was to bring together researchers from different communities (shape analysis, separation logic, graph transformation, verification of infinite-state systems) who are interested in developing techniques for the analysis of graph manipulations, i.e., methods that are able to handle the challenges that arise in current verification problems. Apart from scientific talks, the programme also included four tutorial talks and four working groups, which are summarized in this report.
Cite as

Parosh Aziz Abdulla, Fabio Gadducci, Barbara König, and Viktor Vafeiadis. Verification of Evolving Graph Structures (Dagstuhl Seminar 15451). In Dagstuhl Reports, Volume 5, Issue 11, pp. 1-28, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2016)

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@Article{azizabdulla_et_al:DagRep.5.11.1,
  author =	{Aziz Abdulla, Parosh and Gadducci, Fabio and K\"{o}nig, Barbara and Vafeiadis, Viktor},
  title =	{{Verification of Evolving Graph Structures (Dagstuhl Seminar 15451)}},
  pages =	{1--28},
  journal =	{Dagstuhl Reports},
  ISSN =	{2192-5283},
  year =	{2016},
  volume =	{5},
  number =	{11},
  editor =	{Aziz Abdulla, Parosh and Gadducci, Fabio and K\"{o}nig, Barbara and Vafeiadis, Viktor},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagRep.5.11.1},
  URN =		{urn:nbn:de:0030-drops-57614},
  doi =		{10.4230/DagRep.5.11.1},
  annote =	{Keywords: dynamic systems, graph transformation, graphs, heap analysis, separation logic, shape analysis, static analysis, verification}
}
Document
DOI: 10.4230/LIPIcs.CONCUR.2015.483
Rely/Guarantee Reasoning for Asynchronous Programs

Authors: Ivan Gavran, Filip Niksic, Aditya Kanade, Rupak Majumdar, and Viktor Vafeiadis

Published in: LIPIcs, Volume 42, 26th International Conference on Concurrency Theory (CONCUR 2015)

Abstract
Asynchronous programming has become ubiquitous in smartphone and web application development, as well as in the development of server-side and system applications. Many of the uses of asynchrony can be modeled by extending programming languages with asynchronous procedure calls - procedures not executed immediately, but stored and selected for execution at a later point by a non-deterministic scheduler. Asynchronous calls induce a flow of control that is difficult to reason about, which in turn makes formal verification of asynchronous programs challenging. In response, we take a rely/guarantee approach: Each asynchronous procedure is verified separately with respect to its rely and guarantee predicates; the correctness of the whole program then follows from the natural conditions the rely/guarantee predicates have to satisfy. In this way, the verification of asynchronous programs is modularly decomposed into the more usual verification of sequential programs with synchronous calls. For the sequential program verification we use Hoare-style deductive reasoning, which we demonstrate on several simplified examples. These examples were inspired from programs written in C using the popular Libevent library; they are manually annotated and verified within the state-of-the-art Frama-C platform.
Cite as

Ivan Gavran, Filip Niksic, Aditya Kanade, Rupak Majumdar, and Viktor Vafeiadis. Rely/Guarantee Reasoning for Asynchronous Programs. In 26th International Conference on Concurrency Theory (CONCUR 2015). Leibniz International Proceedings in Informatics (LIPIcs), Volume 42, pp. 483-496, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2015)

Copy BibTex To Clipboard

@InProceedings{gavran_et_al:LIPIcs.CONCUR.2015.483,
  author =	{Gavran, Ivan and Niksic, Filip and Kanade, Aditya and Majumdar, Rupak and Vafeiadis, Viktor},
  title =	{{Rely/Guarantee Reasoning for Asynchronous Programs}},
  booktitle =	{26th International Conference on Concurrency Theory (CONCUR 2015)},
  pages =	{483--496},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-939897-91-0},
  ISSN =	{1868-8969},
  year =	{2015},
  volume =	{42},
  editor =	{Aceto, Luca and de Frutos Escrig, David},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.CONCUR.2015.483},
  URN =		{urn:nbn:de:0030-drops-53902},
  doi =		{10.4230/LIPIcs.CONCUR.2015.483},
  annote =	{Keywords: Asynchronous programs, rely/guarantee reasoning}
}
Document
DOI: 10.4230/LIPIcs.ECOOP.2015.396
Asynchronous Liquid Separation Types

Authors: Johannes Kloos, Rupak Majumdar, and Viktor Vafeiadis

Published in: LIPIcs, Volume 37, 29th European Conference on Object-Oriented Programming (ECOOP 2015)

Abstract
We present a refinement type system for reasoning about asynchronous programs manipulating shared mutable state. Our type system guarantees the absence of races and the preservation of user-specified invariants using a combination of two ideas: refinement types and concurrent separation logic. Our type system allows precise reasoning about programs using two ingredients. First, our types are indexed by sets of resource names and the type system tracks the effect of program execution on individual heap locations and task handles. In particular, it allows making strong updates to the types of heap locations. Second, our types track ownership of shared state across concurrently posted tasks and allow reasoning about ownership transfer between tasks using permissions. We demonstrate through several examples that these two ingredients, on top of the framework of liquid types, are powerful enough to reason about correct behavior of practical, complex, asynchronous systems manipulating shared heap resources. We have implemented type inference for our type system and have used it to prove complex invariants of asynchronous OCaml programs. We also show how the type system detects subtle concurrency bugs in a file system implementation.
Cite as

Johannes Kloos, Rupak Majumdar, and Viktor Vafeiadis. Asynchronous Liquid Separation Types. In 29th European Conference on Object-Oriented Programming (ECOOP 2015). Leibniz International Proceedings in Informatics (LIPIcs), Volume 37, pp. 396-420, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2015)

Copy BibTex To Clipboard

@InProceedings{kloos_et_al:LIPIcs.ECOOP.2015.396,
  author =	{Kloos, Johannes and Majumdar, Rupak and Vafeiadis, Viktor},
  title =	{{Asynchronous Liquid Separation Types}},
  booktitle =	{29th European Conference on Object-Oriented Programming (ECOOP 2015)},
  pages =	{396--420},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-939897-86-6},
  ISSN =	{1868-8969},
  year =	{2015},
  volume =	{37},
  editor =	{Boyland, John Tang},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ECOOP.2015.396},
  URN =		{urn:nbn:de:0030-drops-52233},
  doi =		{10.4230/LIPIcs.ECOOP.2015.396},
  annote =	{Keywords: Liquid Types, Asynchronous Parallelism, Separation Logic, Type Systems}
}
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