DROPS

Volume

LIPIcs, Volume 134

33rd European Conference on Object-Oriented Programming (ECOOP 2019)

ECOOP 2019, July 15-19, 2019, London, United Kingdom

Editors: Alastair F. Donaldson

Document

Artifact

DOI: 10.4230/DARTS.6.2.3

Putting Randomized Compiler Testing into Production (Artifact)

Authors: Alastair F. Donaldson, Hugues Evrard, and Paul Thomson

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

Abstract

This artifact accompanies our experience report for our compiler testing technology transfer project: taking the GraphicsFuzz research project on randomized metamorphic testing of graphics shader compilers, and building the necessary tooling around it to provide a highly automated process for improving the Khronos Vulkan Conformance Test Suite (CTS) with test cases that expose fuzzer-found compiler bugs, or that plug gaps in test coverage. The artifact consists of two Dockerfiles and associated files that can be used to build two Docker containers. The containers include our main tool for performing fuzzing: gfauto. The containers allow the user to fuzz SwiftShader, a software Vulkan implementation, finding 4 bugs. The user will also perform some line coverage analysis of SwiftShader using our tools to synthesize a small test that increases line coverage. Ubuntu, gfauto, SwiftShader, and other dependencies inside the Docker containers are fixed at specific versions, and all random seeds are set to specific values. Thus, all examples should reproduce faithfully on any machine.

Cite as

Alastair F. Donaldson, Hugues Evrard, and Paul Thomson. Putting Randomized Compiler Testing into Production (Artifact). In Special Issue of the 34th European Conference on Object-Oriented Programming (ECOOP 2020). Dagstuhl Artifacts Series (DARTS), Volume 6, Issue 2, pp. 3:1-3:2, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2020)

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@Article{donaldson_et_al:DARTS.6.2.3,
  author =	{Donaldson, Alastair F. and Evrard, Hugues and Thomson, Paul},
  title =	{{Putting Randomized Compiler Testing into Production (Artifact)}},
  pages =	{3:1--3:2},
  journal =	{Dagstuhl Artifacts Series},
  ISSN =	{2509-8195},
  year =	{2020},
  volume =	{6},
  number =	{2},
  editor =	{Donaldson, Alastair F. and Evrard, Hugues and Thomson, Paul},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/DARTS.6.2.3},
  URN =		{urn:nbn:de:0030-drops-132005},
  doi =		{10.4230/DARTS.6.2.3},
  annote =	{Keywords: Compilers, metamorphic testing, 3D graphics, experience report}
}

Document

Tool Insights Paper

DOI: 10.4230/LIPIcs.ECOOP.2020.13

Test-Case Reduction via Test-Case Generation: Insights from the Hypothesis Reducer (Tool Insights Paper)

Authors: David R. MacIver and Alastair F. Donaldson

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

Abstract

We describe internal test-case reduction, the method of test-case reduction employed by Hypothesis, a widely-used property-based testing library for Python. The key idea of internal test-case reduction is that instead of applying test-case reduction externally to generated test cases, we apply it internally, to the sequence of random choices made during generation, so that a test case is reduced by continually re-generating smaller and simpler test cases that continue to trigger some property of interest (e.g. a bug in the system under test). This allows for fully generic test-case reduction without any user intervention and without the need to write a specific test-case reducer for a particular application domain. It also significantly mitigates the impact of the test-case validity problem, by ensuring that any reduced test case is one that could in principle have been generated. We describe the rationale behind this approach, explain its implementation in Hypothesis, and present an extensive evaluation comparing its effectiveness with that of several other test-case reducers, including C-Reduce and delta debugging, on applications including Python auto-formatting, C compilers, and the SymPy symbolic math library. Our hope is that these insights into the reduction mechanism employed by Hypothesis will be useful to researchers interested in randomized testing and test-case reduction, as the crux of the approach is fully generic and should be applicable to any random generator of test cases.

Cite as

David R. MacIver and Alastair F. Donaldson. Test-Case Reduction via Test-Case Generation: Insights from the Hypothesis Reducer (Tool Insights Paper). In 34th European Conference on Object-Oriented Programming (ECOOP 2020). Leibniz International Proceedings in Informatics (LIPIcs), Volume 166, pp. 13:1-13:27, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2020)

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@InProceedings{maciver_et_al:LIPIcs.ECOOP.2020.13,
  author =	{MacIver, David R. and Donaldson, Alastair F.},
  title =	{{Test-Case Reduction via Test-Case Generation: Insights from the Hypothesis Reducer}},
  booktitle =	{34th European Conference on Object-Oriented Programming (ECOOP 2020)},
  pages =	{13:1--13:27},
  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-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.ECOOP.2020.13},
  URN =		{urn:nbn:de:0030-drops-131700},
  doi =		{10.4230/LIPIcs.ECOOP.2020.13},
  annote =	{Keywords: Software testing, test-case reduction}
}

Document

Experience Report

DOI: 10.4230/LIPIcs.ECOOP.2020.22

Putting Randomized Compiler Testing into Production (Experience Report)

Authors: Alastair F. Donaldson, Hugues Evrard, and Paul Thomson

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

Abstract

We describe our experience over the last 18 months on a compiler testing technology transfer project: taking the GraphicsFuzz research project on randomized metamorphic testing of graphics shader compilers, and building the necessary tooling around it to provide a highly automated process for improving the Khronos Vulkan Conformance Test Suite (CTS) with test cases that expose fuzzer-found compiler bugs, or that plug gaps in test coverage. We present this tooling for test automation - gfauto - in detail, as well as our use of differential coverage and test case reduction as a method for automatically synthesizing tests that fill coverage gaps. We explain the value that GraphicsFuzz has provided in automatically testing the ecosystem of tools for transforming, optimizing and validating Vulkan shaders, and the challenges faced when testing a tool ecosystem rather than a single tool. We discuss practical issues associated with putting automated metamorphic testing into production, related to test case validity, bug de-duplication and floating-point precision, and provide illustrative examples of bugs found during our work.

Cite as

Alastair F. Donaldson, Hugues Evrard, and Paul Thomson. Putting Randomized Compiler Testing into Production (Experience Report). In 34th European Conference on Object-Oriented Programming (ECOOP 2020). Leibniz International Proceedings in Informatics (LIPIcs), Volume 166, pp. 22:1-22:29, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2020)

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@InProceedings{donaldson_et_al:LIPIcs.ECOOP.2020.22,
  author =	{Donaldson, Alastair F. and Evrard, Hugues and Thomson, Paul},
  title =	{{Putting Randomized Compiler Testing into Production}},
  booktitle =	{34th European Conference on Object-Oriented Programming (ECOOP 2020)},
  pages =	{22:1--22:29},
  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-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.ECOOP.2020.22},
  URN =		{urn:nbn:de:0030-drops-131791},
  doi =		{10.4230/LIPIcs.ECOOP.2020.22},
  annote =	{Keywords: Compilers, metamorphic testing, 3D graphics, experience report}
}

Document

Complete Volume

DOI: 10.4230/LIPIcs.ECOOP.2019

LIPIcs, Volume 134, ECOOP'19, Complete Volume

Authors: Alastair F. Donaldson

Published in: LIPIcs, Volume 134, 33rd European Conference on Object-Oriented Programming (ECOOP 2019)

Abstract

LIPIcs, Volume 134, ECOOP'19, Complete Volume

Cite as

33rd European Conference on Object-Oriented Programming (ECOOP 2019). Leibniz International Proceedings in Informatics (LIPIcs), Volume 134, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2019)

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@Proceedings{donaldson:LIPIcs.ECOOP.2019,
  title =	{{LIPIcs, Volume 134, ECOOP'19, Complete Volume}},
  booktitle =	{33rd European Conference on Object-Oriented Programming (ECOOP 2019)},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-111-5},
  ISSN =	{1868-8969},
  year =	{2019},
  volume =	{134},
  editor =	{Donaldson, Alastair F.},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.ECOOP.2019},
  URN =		{urn:nbn:de:0030-drops-108979},
  doi =		{10.4230/LIPIcs.ECOOP.2019},
  annote =	{Keywords: Software and its engineering}
}

Document

Front Matter

DOI: 10.4230/LIPIcs.ECOOP.2019.0

Front Matter, Table of Contents, Preface, Conference Organization

Authors: Alastair F. Donaldson

Published in: LIPIcs, Volume 134, 33rd European Conference on Object-Oriented Programming (ECOOP 2019)

Abstract

Front Matter, Table of Contents, Preface, Conference Organization

Cite as

33rd European Conference on Object-Oriented Programming (ECOOP 2019). Leibniz International Proceedings in Informatics (LIPIcs), Volume 134, pp. 0:i-0:xxv, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2019)

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@InProceedings{donaldson:LIPIcs.ECOOP.2019.0,
  author =	{Donaldson, Alastair F.},
  title =	{{Front Matter, Table of Contents, Preface, Conference Organization}},
  booktitle =	{33rd European Conference on Object-Oriented Programming (ECOOP 2019)},
  pages =	{0:i--0:xxv},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-111-5},
  ISSN =	{1868-8969},
  year =	{2019},
  volume =	{134},
  editor =	{Donaldson, Alastair F.},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.ECOOP.2019.0},
  URN =		{urn:nbn:de:0030-drops-107928},
  doi =		{10.4230/LIPIcs.ECOOP.2019.0},
  annote =	{Keywords: Front Matter, Table of Contents, Preface, Conference Organization}
}

Document

DOI: 10.4230/LIPIcs.ECOOP.2019.1

Lifestate: Event-Driven Protocols and Callback Control Flow

Authors: Shawn Meier, Sergio Mover, and Bor-Yuh Evan Chang

Published in: LIPIcs, Volume 134, 33rd European Conference on Object-Oriented Programming (ECOOP 2019)

Abstract

Developing interactive applications (apps) against event-driven software frameworks such as Android is notoriously difficult. To create apps that behave as expected, developers must follow complex and often implicit asynchronous programming protocols. Such protocols intertwine the proper registering of callbacks to receive control from the framework with appropriate application-programming interface (API) calls that in turn affect the set of possible future callbacks. An app violates the protocol when, for example, it calls a particular API method in a state of the framework where such a call is invalid. What makes automated reasoning hard in this domain is largely what makes programming apps against such frameworks hard: the specification of the protocol is unclear, and the control flow is complex, asynchronous, and higher-order. In this paper, we tackle the problem of specifying and modeling event-driven application-programming protocols. In particular, we formalize a core meta-model that captures the dialogue between event-driven frameworks and application callbacks. Based on this meta-model, we define a language called lifestate that permits precise and formal descriptions of application-programming protocols and the callback control flow imposed by the event-driven framework. Lifestate unifies modeling what app callbacks can expect of the framework with specifying rules the app must respect when calling into the framework. In this way, we effectively combine lifecycle constraints and typestate rules. To evaluate the effectiveness of lifestate modeling, we provide a dynamic verification algorithm that takes as input a trace of execution of an app and a lifestate protocol specification to either produce a trace witnessing a protocol violation or a proof that no such trace is realizable.

Cite as

Shawn Meier, Sergio Mover, and Bor-Yuh Evan Chang. Lifestate: Event-Driven Protocols and Callback Control Flow. In 33rd European Conference on Object-Oriented Programming (ECOOP 2019). Leibniz International Proceedings in Informatics (LIPIcs), Volume 134, pp. 1:1-1:29, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2019)

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@InProceedings{meier_et_al:LIPIcs.ECOOP.2019.1,
  author =	{Meier, Shawn and Mover, Sergio and Chang, Bor-Yuh Evan},
  title =	{{Lifestate: Event-Driven Protocols and Callback Control Flow}},
  booktitle =	{33rd European Conference on Object-Oriented Programming (ECOOP 2019)},
  pages =	{1:1--1:29},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-111-5},
  ISSN =	{1868-8969},
  year =	{2019},
  volume =	{134},
  editor =	{Donaldson, Alastair F.},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.ECOOP.2019.1},
  URN =		{urn:nbn:de:0030-drops-107932},
  doi =		{10.4230/LIPIcs.ECOOP.2019.1},
  annote =	{Keywords: event-driven systems, application-programming protocols, application framework interfaces, callbacks, sound framework modeling, predictive dynamic verification}
}

Document

DOI: 10.4230/LIPIcs.ECOOP.2019.2

Godot: All the Benefits of Implicit and Explicit Futures

Authors: Kiko Fernandez-Reyes, Dave Clarke, Ludovic Henrio, Einar Broch Johnsen, and Tobias Wrigstad

Published in: LIPIcs, Volume 134, 33rd European Conference on Object-Oriented Programming (ECOOP 2019)

Abstract

Concurrent programs often make use of futures, handles to the results of asynchronous operations. Futures provide means to communicate not yet computed results, and simplify the implementation of operations that synchronise on the result of such asynchronous operations. Futures can be characterised as implicit or explicit, depending on the typing discipline used to type them. Current future implementations suffer from "future proliferation", either at the type-level or at run-time. The former adds future type wrappers, which hinders subtype polymorphism and exposes the client to the internal asynchronous communication architecture. The latter increases latency, by traversing nested future structures at run-time. Many languages suffer both kinds. Previous work offer partial solutions to the future proliferation problems; in this paper we show how these solutions can be integrated in an elegant and coherent way, which is more expressive than either system in isolation. We describe our proposal formally, and state and prove its key properties, in two related calculi, based on the two possible families of future constructs (data-flow futures and control-flow futures). The former relies on static type information to avoid unwanted future creation, and the latter uses an algebraic data type with dynamic checks. We also discuss how to implement our new system efficiently.

Cite as

Kiko Fernandez-Reyes, Dave Clarke, Ludovic Henrio, Einar Broch Johnsen, and Tobias Wrigstad. Godot: All the Benefits of Implicit and Explicit Futures. In 33rd European Conference on Object-Oriented Programming (ECOOP 2019). Leibniz International Proceedings in Informatics (LIPIcs), Volume 134, pp. 2:1-2:28, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2019)

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@InProceedings{fernandezreyes_et_al:LIPIcs.ECOOP.2019.2,
  author =	{Fernandez-Reyes, Kiko and Clarke, Dave and Henrio, Ludovic and Johnsen, Einar Broch and Wrigstad, Tobias},
  title =	{{Godot: All the Benefits of Implicit and Explicit Futures}},
  booktitle =	{33rd European Conference on Object-Oriented Programming (ECOOP 2019)},
  pages =	{2:1--2:28},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-111-5},
  ISSN =	{1868-8969},
  year =	{2019},
  volume =	{134},
  editor =	{Donaldson, Alastair F.},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.ECOOP.2019.2},
  URN =		{urn:nbn:de:0030-drops-107949},
  doi =		{10.4230/LIPIcs.ECOOP.2019.2},
  annote =	{Keywords: Futures, Concurrency, Type Systems, Formal Semantics}
}

Document

DOI: 10.4230/LIPIcs.ECOOP.2019.3

Multitier Modules

Authors: Pascal Weisenburger and Guido Salvaneschi

Published in: LIPIcs, Volume 134, 33rd European Conference on Object-Oriented Programming (ECOOP 2019)

Abstract

Multitier programming languages address the complexity of developing distributed systems abstracting over low level implementation details such as data representation, serialization and network protocols. Since the functionalities of different peers can be defined in the same compilation unit, multitier languages do not force developers to modularize software along network boundaries. Unfortunately, combining the code for all tiers into the same compilation unit poses a scalability challenge or forces developers to resort to traditional modularization abstractions that are agnostic to the multitier nature of the language. In this paper, we address this issue with a module system for multitier languages. Our module system supports encapsulating each (cross-peer) functionality and defining it over abstract peer types. As a result, we disentangle modularization and distribution and we enable the definition of a distributed system as a composition of multitier modules, each representing a subsystem. Our case studies on distributed algorithms, distributed data structures, as well as on the Apache Flink task distribution system, show that multitier modules allow the definition of reusable (abstract) patterns of interaction in distributed software and enable separating the modularization and distribution concerns, properly separating functionalities in distributed systems.

Cite as

Pascal Weisenburger and Guido Salvaneschi. Multitier Modules. In 33rd European Conference on Object-Oriented Programming (ECOOP 2019). Leibniz International Proceedings in Informatics (LIPIcs), Volume 134, pp. 3:1-3:29, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2019)

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@InProceedings{weisenburger_et_al:LIPIcs.ECOOP.2019.3,
  author =	{Weisenburger, Pascal and Salvaneschi, Guido},
  title =	{{Multitier Modules}},
  booktitle =	{33rd European Conference on Object-Oriented Programming (ECOOP 2019)},
  pages =	{3:1--3:29},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-111-5},
  ISSN =	{1868-8969},
  year =	{2019},
  volume =	{134},
  editor =	{Donaldson, Alastair F.},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.ECOOP.2019.3},
  URN =		{urn:nbn:de:0030-drops-107957},
  doi =		{10.4230/LIPIcs.ECOOP.2019.3},
  annote =	{Keywords: Distributed Programming, Multitier Programming, Abstract Peer Types, Placement Types, Module Systems, Scala}
}

Document

DOI: 10.4230/LIPIcs.ECOOP.2019.4

Scopes and Frames Improve Meta-Interpreter Specialization

Authors: Vlad Vergu, Andrew Tolmach, and Eelco Visser

Published in: LIPIcs, Volume 134, 33rd European Conference on Object-Oriented Programming (ECOOP 2019)

Abstract

DynSem is a domain-specific language for concise specification of the dynamic semantics of programming languages, aimed at rapid experimentation and evolution of language designs. To maintain a short definition-to-execution cycle, DynSem specifications are meta-interpreted. Meta-interpretation introduces runtime overhead that is difficult to remove by using interpreter optimization frameworks such as the Truffle/Graal Java tools; previous work has shown order-of-magnitude improvements from applying Truffle/Graal to a meta-interpreter, but this is still far slower than what can be achieved with a language-specific interpreter. In this paper, we show how specifying the meta-interpreter using scope graphs, which encapsulate static name binding and resolution information, produces much better optimization results from Truffle/Graal. Furthermore, we identify that JIT compilation is hindered by large numbers of calls between small polymorphic rules and we introduce rule cloning to derive larger monomorphic rules at run time as a countermeasure. Our contributions improve the performance of DynSem-derived interpreters to within an order of magnitude of a handwritten language-specific interpreter.

Cite as

Vlad Vergu, Andrew Tolmach, and Eelco Visser. Scopes and Frames Improve Meta-Interpreter Specialization. In 33rd European Conference on Object-Oriented Programming (ECOOP 2019). Leibniz International Proceedings in Informatics (LIPIcs), Volume 134, pp. 4:1-4:30, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2019)

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@InProceedings{vergu_et_al:LIPIcs.ECOOP.2019.4,
  author =	{Vergu, Vlad and Tolmach, Andrew and Visser, Eelco},
  title =	{{Scopes and Frames Improve Meta-Interpreter Specialization}},
  booktitle =	{33rd European Conference on Object-Oriented Programming (ECOOP 2019)},
  pages =	{4:1--4:30},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-111-5},
  ISSN =	{1868-8969},
  year =	{2019},
  volume =	{134},
  editor =	{Donaldson, Alastair F.},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.ECOOP.2019.4},
  URN =		{urn:nbn:de:0030-drops-107969},
  doi =		{10.4230/LIPIcs.ECOOP.2019.4},
  annote =	{Keywords: Definitional interpreters, partial evaluation}
}

Document

DOI: 10.4230/LIPIcs.ECOOP.2019.5

Transient Typechecks Are (Almost) Free

Authors: Richard Roberts, Stefan Marr, Michael Homer, and James Noble

Published in: LIPIcs, Volume 134, 33rd European Conference on Object-Oriented Programming (ECOOP 2019)

Abstract

Transient gradual typing imposes run-time type tests that typically cause a linear slowdown. This performance impact discourages the use of type annotations because adding types to a program makes the program slower. A virtual machine can employ standard just-in-time optimizations to reduce the overhead of transient checks to near zero. These optimizations can give gradually-typed languages performance comparable to state-of-the-art dynamic languages, so programmers can add types to their code without affecting their programs' performance.

Cite as

Richard Roberts, Stefan Marr, Michael Homer, and James Noble. Transient Typechecks Are (Almost) Free. In 33rd European Conference on Object-Oriented Programming (ECOOP 2019). Leibniz International Proceedings in Informatics (LIPIcs), Volume 134, pp. 5:1-5:28, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2019)

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@InProceedings{roberts_et_al:LIPIcs.ECOOP.2019.5,
  author =	{Roberts, Richard and Marr, Stefan and Homer, Michael and Noble, James},
  title =	{{Transient Typechecks Are (Almost) Free}},
  booktitle =	{33rd European Conference on Object-Oriented Programming (ECOOP 2019)},
  pages =	{5:1--5:28},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-111-5},
  ISSN =	{1868-8969},
  year =	{2019},
  volume =	{134},
  editor =	{Donaldson, Alastair F.},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.ECOOP.2019.5},
  URN =		{urn:nbn:de:0030-drops-107974},
  doi =		{10.4230/LIPIcs.ECOOP.2019.5},
  annote =	{Keywords: dynamic type checking, gradual types, optional types, Grace, Moth, object-oriented programming}
}

Document

DOI: 10.4230/LIPIcs.ECOOP.2019.6

A Typing Discipline for Hardware Interfaces

Authors: Jan de Muijnck-Hughes and Wim Vanderbauwhede

Published in: LIPIcs, Volume 134, 33rd European Conference on Object-Oriented Programming (ECOOP 2019)

Abstract

Modern Systems-on-a-Chip (SoC) are constructed by composition of IP (Intellectual Property) Cores with the communication between these IP Cores being governed by well described interaction protocols. However, there is a disconnect between the machine readable specification of these protocols and the verification of their implementation in known hardware description languages. Although tools can be written to address such separation of concerns, the tooling is often hand written and used to check hardware designs a posteriori. We have developed a dependent type-system and proof-of-concept modelling language to reason about the physical structure of hardware interfaces using user provided descriptions. Our type-system provides correct-by-construction guarantees that the interfaces on an IP Core will be well-typed if they adhere to a specified standard.

Cite as

Jan de Muijnck-Hughes and Wim Vanderbauwhede. A Typing Discipline for Hardware Interfaces. In 33rd European Conference on Object-Oriented Programming (ECOOP 2019). Leibniz International Proceedings in Informatics (LIPIcs), Volume 134, pp. 6:1-6:27, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2019)

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@InProceedings{demuijnckhughes_et_al:LIPIcs.ECOOP.2019.6,
  author =	{de Muijnck-Hughes, Jan and Vanderbauwhede, Wim},
  title =	{{A Typing Discipline for Hardware Interfaces}},
  booktitle =	{33rd European Conference on Object-Oriented Programming (ECOOP 2019)},
  pages =	{6:1--6:27},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-111-5},
  ISSN =	{1868-8969},
  year =	{2019},
  volume =	{134},
  editor =	{Donaldson, Alastair F.},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.ECOOP.2019.6},
  URN =		{urn:nbn:de:0030-drops-107983},
  doi =		{10.4230/LIPIcs.ECOOP.2019.6},
  annote =	{Keywords: System-on-a-Chip, AXI, Dependent Types, Substructural Typing}
}

Document

DOI: 10.4230/LIPIcs.ECOOP.2019.7

On Satisfiability of Nominal Subtyping with Variance

Authors: Aleksandr Misonizhnik and Dmitry Mordvinov

Published in: LIPIcs, Volume 134, 33rd European Conference on Object-Oriented Programming (ECOOP 2019)

Abstract

Nominal type systems with variance, the core of the subtyping relation in object-oriented programming languages like Java, C# and Scala, have been extensively studied by Kennedy and Pierce: they have shown the undecidability of the subtyping between ground types and proposed the decidable fragments of such type systems. However, modular verification of object-oriented code may require reasoning about the relations of open types. In this paper, we formalize and investigate the satisfiability problem for nominal subtyping with variance. We define the problem in the context of first-order logic. We show that although the non-expansive ground nominal subtyping with variance is decidable, its satisfiability problem is undecidable. Our proof uses a remarkably small fragment of the type system. In fact, we demonstrate that even for the non-expansive class tables with only nullary and unary covariant and invariant type constructors, the satisfiability of quantifier-free conjunctions of positive subtyping atoms is undecidable. We discuss this result in detail, as well as show one decidable fragment and a scheme for obtaining other decidable fragments.

Cite as

Aleksandr Misonizhnik and Dmitry Mordvinov. On Satisfiability of Nominal Subtyping with Variance. In 33rd European Conference on Object-Oriented Programming (ECOOP 2019). Leibniz International Proceedings in Informatics (LIPIcs), Volume 134, pp. 7:1-7:20, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2019)

Copy BibTex To Clipboard

@InProceedings{misonizhnik_et_al:LIPIcs.ECOOP.2019.7,
  author =	{Misonizhnik, Aleksandr and Mordvinov, Dmitry},
  title =	{{On Satisfiability of Nominal Subtyping with Variance}},
  booktitle =	{33rd European Conference on Object-Oriented Programming (ECOOP 2019)},
  pages =	{7:1--7:20},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-111-5},
  ISSN =	{1868-8969},
  year =	{2019},
  volume =	{134},
  editor =	{Donaldson, Alastair F.},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.ECOOP.2019.7},
  URN =		{urn:nbn:de:0030-drops-107997},
  doi =		{10.4230/LIPIcs.ECOOP.2019.7},
  annote =	{Keywords: nominal type systems, structural subtyping, first-order logic, decidability, software verification}
}

Document

DOI: 10.4230/LIPIcs.ECOOP.2019.8

Static Analysis for Asynchronous JavaScript Programs

Authors: Thodoris Sotiropoulos and Benjamin Livshits

Published in: LIPIcs, Volume 134, 33rd European Conference on Object-Oriented Programming (ECOOP 2019)

Abstract

Asynchrony has become an inherent element of JavaScript, as an effort to improve the scalability and performance of modern web applications. To this end, JavaScript provides programmers with a wide range of constructs and features for developing code that performs asynchronous computations, including but not limited to timers, promises, and non-blocking I/O. However, the data flow imposed by asynchrony is implicit, and not always well-understood by the developers who introduce many asynchrony-related bugs to their programs. Worse, there are few tools and techniques available for analyzing and reasoning about such asynchronous applications. In this work, we address this issue by designing and implementing one of the first static analysis schemes capable of dealing with almost all the asynchronous primitives of JavaScript up to the 7th edition of the ECMAScript specification. Specifically, we introduce the callback graph, a representation for capturing data flow between asynchronous code. We exploit the callback graph for designing a more precise analysis that respects the execution order between different asynchronous functions. We parameterize our analysis with one novel context-sensitivity flavor, and we end up with multiple analysis variations for building callback graph. We performed a number of experiments on a set of hand-written and real-world JavaScript programs. Our results show that our analysis can be applied to medium-sized programs achieving 79% precision, on average. The findings further suggest that analysis sensitivity is beneficial for the vast majority of the benchmarks. Specifically, it is able to improve precision by up to 28.5%, while it achieves an 88% precision on average without highly sacrificing performance.

Cite as

Thodoris Sotiropoulos and Benjamin Livshits. Static Analysis for Asynchronous JavaScript Programs. In 33rd European Conference on Object-Oriented Programming (ECOOP 2019). Leibniz International Proceedings in Informatics (LIPIcs), Volume 134, pp. 8:1-8:29, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2019)

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@InProceedings{sotiropoulos_et_al:LIPIcs.ECOOP.2019.8,
  author =	{Sotiropoulos, Thodoris and Livshits, Benjamin},
  title =	{{Static Analysis for Asynchronous JavaScript Programs}},
  booktitle =	{33rd European Conference on Object-Oriented Programming (ECOOP 2019)},
  pages =	{8:1--8:29},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-111-5},
  ISSN =	{1868-8969},
  year =	{2019},
  volume =	{134},
  editor =	{Donaldson, Alastair F.},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.ECOOP.2019.8},
  URN =		{urn:nbn:de:0030-drops-108007},
  doi =		{10.4230/LIPIcs.ECOOP.2019.8},
  annote =	{Keywords: static analysis, asynchrony, JavaScript}
}

Document

DOI: 10.4230/LIPIcs.ECOOP.2019.9

A Program Logic for First-Order Encapsulated WebAssembly

Authors: Conrad Watt, Petar Maksimović, Neelakantan R. Krishnaswami, and Philippa Gardner

Published in: LIPIcs, Volume 134, 33rd European Conference on Object-Oriented Programming (ECOOP 2019)

Abstract

We introduce Wasm Logic, a sound program logic for first-order, encapsulated WebAssembly. We design a novel assertion syntax, tailored to WebAssembly’s stack-based semantics and the strong guarantees given by WebAssembly’s type system, and show how to adapt the standard separation logic triple and proof rules in a principled way to capture WebAssembly’s uncommon structured control flow. Using Wasm Logic, we specify and verify a simple WebAssembly B-tree library, giving abstract specifications independent of the underlying implementation. We mechanise Wasm Logic and its soundness proof in full in Isabelle/HOL. As part of the soundness proof, we formalise and fully mechanise a novel, big-step semantics of WebAssembly, which we prove equivalent, up to transitive closure, to the original WebAssembly small-step semantics. Wasm Logic is the first program logic for WebAssembly, and represents a first step towards the creation of static analysis tools for WebAssembly.

Cite as

Conrad Watt, Petar Maksimović, Neelakantan R. Krishnaswami, and Philippa Gardner. A Program Logic for First-Order Encapsulated WebAssembly. In 33rd European Conference on Object-Oriented Programming (ECOOP 2019). Leibniz International Proceedings in Informatics (LIPIcs), Volume 134, pp. 9:1-9:30, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2019)

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@InProceedings{watt_et_al:LIPIcs.ECOOP.2019.9,
  author =	{Watt, Conrad and Maksimovi\'{c}, Petar and Krishnaswami, Neelakantan R. and Gardner, Philippa},
  title =	{{A Program Logic for First-Order Encapsulated WebAssembly}},
  booktitle =	{33rd European Conference on Object-Oriented Programming (ECOOP 2019)},
  pages =	{9:1--9:30},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-111-5},
  ISSN =	{1868-8969},
  year =	{2019},
  volume =	{134},
  editor =	{Donaldson, Alastair F.},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.ECOOP.2019.9},
  URN =		{urn:nbn:de:0030-drops-108011},
  doi =		{10.4230/LIPIcs.ECOOP.2019.9},
  annote =	{Keywords: WebAssembly, program logic, separation logic, soundness, mechanisation}
}

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