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Documents authored by Visser, Eelco

Document
Artifact
DOI: 10.4230/DARTS.7.2.1
Scope States (Artifact)

Authors: Hendrik van Antwerpen and Eelco Visser

Published in: DARTS, Volume 7, Issue 2, Special Issue of the 35th European Conference on Object-Oriented Programming (ECOOP 2021)

Abstract
Compilers that can type check compilation units in parallel can make more efficient use of multi-core architectures, which are nowadays widespread. Developing parallel type checker implementations is complicated by the need to handle concurrency and synchronization of parallel compilation units. This artifact contains benchmarks and sources for a new framework for implementing hierarchical type checkers that provides implicit parallel execution in the presence of dynamic and mutual dependencies between compilation units. The resulting type checkers can be written without explicit handling of communication or synchronization between different compilation units. We achieve this by providing type checkers with an API for name resolution based on scope graphs, a language-independent formalism that supports a wide range of binding patterns. Our framework is implemented in Java using the actor paradigm. We evaluated our approach by parallelizing the solver for Statix, a meta-language for type checkers based on scope graphs, using our framework. Benchmarks show that the approach results in speedups for the parallel Statix solver of up to 5.0x on 8 cores for real-world code bases.
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Hendrik van Antwerpen and Eelco Visser. Scope States (Artifact). In Special Issue of the 35th European Conference on Object-Oriented Programming (ECOOP 2021). Dagstuhl Artifacts Series (DARTS), Volume 7, Issue 2, pp. 1:1-1:7, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2021)

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@Article{vanantwerpen_et_al:DARTS.7.2.1,
  author =	{van Antwerpen, Hendrik and Visser, Eelco},
  title =	{{Scope States (Artifact)}},
  pages =	{1:1--1:7},
  journal =	{Dagstuhl Artifacts Series},
  ISSN =	{2509-8195},
  year =	{2021},
  volume =	{7},
  number =	{2},
  editor =	{van Antwerpen, Hendrik and Visser, Eelco},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DARTS.7.2.1},
  URN =		{urn:nbn:de:0030-drops-140259},
  doi =		{10.4230/DARTS.7.2.1},
  annote =	{Keywords: type checking, name resolution, parallel algorithms}
}
Document
DOI: 10.4230/LIPIcs.ECOOP.2021.1
Scope States: Guarding Safety of Name Resolution in Parallel Type Checkers

Authors: Hendrik van Antwerpen and Eelco Visser

Published in: LIPIcs, Volume 194, 35th European Conference on Object-Oriented Programming (ECOOP 2021)

Abstract
Compilers that can type check compilation units in parallel can make more efficient use of multi-core architectures, which are nowadays widespread. Developing parallel type checker implementations is complicated by the need to handle concurrency and synchronization of parallel compilation units. Dependencies between compilation units are induced by name resolution, and a parallel type checker needs to ensure that units have defined all relevant names before other units do a lookup. Mutually recursive references and implicitly discovered dependencies between compilation units preclude determining a static compilation order for many programming languages. In this paper, we present a new framework for implementing hierarchical type checkers that provides implicit parallel execution in the presence of dynamic and mutual dependencies between compilation units. The resulting type checkers can be written without explicit handling of communication or synchronization between different compilation units. We achieve this by providing type checkers with an API for name resolution based on scope graphs, a language-independent formalism that supports a wide range of binding patterns. We introduce the notion of scope state to ensure safe name resolution. Scope state tracks the completeness of a scope, and is used to decide whether a scope graph query between compilation units must be delayed. Our framework is implemented in Java using the actor paradigm. We evaluated our approach by parallelizing the solver for Statix, a meta-language for type checkers based on scope graphs, using our framework. This parallelizes every Statix-based type checker, provided its specification follows a split declaration-type style. Benchmarks show that the approach results in speedups for the parallel Statix solver of up to 5.0x on 8 cores for real-world code bases.
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Hendrik van Antwerpen and Eelco Visser. Scope States: Guarding Safety of Name Resolution in Parallel Type Checkers. In 35th European Conference on Object-Oriented Programming (ECOOP 2021). Leibniz International Proceedings in Informatics (LIPIcs), Volume 194, pp. 1:1-1:29, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2021)

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@InProceedings{vanantwerpen_et_al:LIPIcs.ECOOP.2021.1,
  author =	{van Antwerpen, Hendrik and Visser, Eelco},
  title =	{{Scope States: Guarding Safety of Name Resolution in Parallel Type Checkers}},
  booktitle =	{35th European Conference on Object-Oriented Programming (ECOOP 2021)},
  pages =	{1:1--1:29},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-190-0},
  ISSN =	{1868-8969},
  year =	{2021},
  volume =	{194},
  editor =	{M{\o}ller, Anders and Sridharan, Manu},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ECOOP.2021.1},
  URN =		{urn:nbn:de:0030-drops-140441},
  doi =		{10.4230/LIPIcs.ECOOP.2021.1},
  annote =	{Keywords: type checking, name resolution, parallel algorithms}
}
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.
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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.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
Brave New Idea Paper
DOI: 10.4230/LIPIcs.ECOOP.2019.26
Towards Language-Parametric Semantic Editor Services Based on Declarative Type System Specifications (Brave New Idea Paper)

Authors: Daniel A. A. Pelsmaeker, Hendrik van Antwerpen, and Eelco Visser

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

Abstract
Editor services assist programmers to more effectively write and comprehend code. Implementing editor services correctly is not trivial. This paper focuses on the specification of semantic editor services, those that use the semantic model of a program. The specification of refactorings is a common subject of study, but many other semantic editor services have received little attention. We propose a language-parametric approach to the definition of semantic editor services, using a declarative specification of the static semantics of the programming language, and constraint solving. Editor services are specified as constraint problems, and language specifications are used to ensure correctness. We describe our approach for the following semantic editor services: reference resolution, find usages, goto subclasses, code completion, and the extract definition refactoring. We do this in the context of Statix, a constraint language for the specification of type systems. We investigate the specification of editor services in terms of Statix constraints, and the requirements these impose on a suitable solver.
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Daniel A. A. Pelsmaeker, Hendrik van Antwerpen, and Eelco Visser. Towards Language-Parametric Semantic Editor Services Based on Declarative Type System Specifications (Brave New Idea Paper). In 33rd European Conference on Object-Oriented Programming (ECOOP 2019). Leibniz International Proceedings in Informatics (LIPIcs), Volume 134, pp. 26:1-26:18, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2019)

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@InProceedings{pelsmaeker_et_al:LIPIcs.ECOOP.2019.26,
  author =	{Pelsmaeker, Daniel A. A. and van Antwerpen, Hendrik and Visser, Eelco},
  title =	{{Towards Language-Parametric Semantic Editor Services Based on Declarative Type System Specifications}},
  booktitle =	{33rd European Conference on Object-Oriented Programming (ECOOP 2019)},
  pages =	{26:1--26:18},
  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.dagstuhl.de/entities/document/10.4230/LIPIcs.ECOOP.2019.26},
  URN =		{urn:nbn:de:0030-drops-108182},
  doi =		{10.4230/LIPIcs.ECOOP.2019.26},
  annote =	{Keywords: semantics, constraint solving, Statix, name binding, editor services, reference resolution, code completion, refactoring}
}
Document
DOI: 10.4230/DARTS.3.2.1
IceDust 2: Derived Bidirectional Relations and Calculation Strategy Composition (Artifact)

Authors: Daco C. Harkes and Eelco Visser

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 IceDust2, a data modeling language with derived values. The provided package is designed to support the claims of the companion paper: in particular, it allows users to compile and run IceDust2 specifications. Instructions for building the IceDust2 compiler from source in Spoofax are also provided.
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Daco C. Harkes and Eelco Visser. IceDust 2: Derived Bidirectional Relations and Calculation Strategy Composition (Artifact). In Special Issue of the 31st European Conference on Object-Oriented Programming (ECOOP 2017). Dagstuhl Artifacts Series (DARTS), Volume 3, Issue 2, pp. 1:1-1:2, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2017)

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@Article{harkes_et_al:DARTS.3.2.1,
  author =	{Harkes, Daco C. and Visser, Eelco},
  title =	{{IceDust 2: Derived Bidirectional Relations and Calculation Strategy Composition (Artifact)}},
  pages =	{1:1--1:2},
  journal =	{Dagstuhl Artifacts Series},
  ISSN =	{2509-8195},
  year =	{2017},
  volume =	{3},
  number =	{2},
  editor =	{Harkes, Daco C. and Visser, Eelco},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DARTS.3.2.1},
  URN =		{urn:nbn:de:0030-drops-72826},
  doi =		{10.4230/DARTS.3.2.1},
  annote =	{Keywords: incremental computing, data modeling, domain specific language}
}
Document
DOI: 10.4230/LIPIcs.ECOOP.2017.14
IceDust 2: Derived Bidirectional Relations and Calculation Strategy Composition

Authors: Daco C. Harkes and Eelco Visser

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

Abstract
Derived values are values calculated from base values. They can be expressed with views in relational databases, or with expressions in incremental or reactive programming. However, relational views do not provide multiplicity bounds, and incremental and reactive programming require significant boilerplate code in order to encode bidirectional derived values. Moreover, the composition of various strategies for calculating derived values is either disallowed, or not checked for producing derived values which will be consistent with the derived values they depend upon. In this paper we present IceDust2, an extension of the declarative data modeling language IceDust with derived bidirectional relations with multiplicity bounds and support for statically checked composition of calculation strategies. Derived bidirectional relations, multiplicity bounds, and calculation strategies all influence runtime behavior of changes to data, leading to hundreds of possible behavior definitions. IceDust2 uses a product-line based code generator to avoid explicitly defining all possible combinations, making it easier to reason about correctness. The type system allows only sound composition of strategies and guarantees multiplicity bounds. Finally, our case studies validate the usability of IceDust2 in applications.
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Daco C. Harkes and Eelco Visser. IceDust 2: Derived Bidirectional Relations and Calculation Strategy Composition. In 31st European Conference on Object-Oriented Programming (ECOOP 2017). Leibniz International Proceedings in Informatics (LIPIcs), Volume 74, pp. 14:1-14:29, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2017)

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@InProceedings{harkes_et_al:LIPIcs.ECOOP.2017.14,
  author =	{Harkes, Daco C. and Visser, Eelco},
  title =	{{IceDust 2: Derived Bidirectional Relations and Calculation Strategy Composition}},
  booktitle =	{31st European Conference on Object-Oriented Programming (ECOOP 2017)},
  pages =	{14:1--14:29},
  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.2017.14},
  URN =		{urn:nbn:de:0030-drops-72518},
  doi =		{10.4230/LIPIcs.ECOOP.2017.14},
  annote =	{Keywords: Incremental Computing, Data Modeling, Domain Specific Language}
}
Document
DOI: 10.4230/LIPIcs.ECOOP.2016.11
IceDust: Incremental and Eventual Computation of Derived Values in Persistent Object Graphs

Authors: Daco C. Harkes, Danny M. Groenewegen, and Eelco Visser

Published in: LIPIcs, Volume 56, 30th European Conference on Object-Oriented Programming (ECOOP 2016)

Abstract
Derived values are values calculated from base values. They can be expressed in object-oriented languages by means of getters calculating the derived value, and in relational or logic databases by means of (materialized) views. However, switching to a different calculation strategy (for example caching) in object-oriented programming requires invasive code changes, and the databases limit expressiveness by disallowing recursive aggregation. In this paper, we present IceDust, a data modeling language for expressing derived attribute values without committing to a calculation strategy. IceDust provides three strategies for calculating derived values in persistent object graphs: Calculate-on-Read, Calculate-on-Write, and Calculate-Eventually. We have developed a path-based abstract interpretation that provides static dependency analysis to generate code for these strategies. Benchmarks show that different strategies perform better in different scenarios. In addition we have conducted a case study that suggests that derived value calculations of systems used in practice can be expressed in IceDust.
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Daco C. Harkes, Danny M. Groenewegen, and Eelco Visser. IceDust: Incremental and Eventual Computation of Derived Values in Persistent Object Graphs. In 30th European Conference on Object-Oriented Programming (ECOOP 2016). Leibniz International Proceedings in Informatics (LIPIcs), Volume 56, pp. 11:1-11:26, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2016)

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@InProceedings{harkes_et_al:LIPIcs.ECOOP.2016.11,
  author =	{Harkes, Daco C. and Groenewegen, Danny M. and Visser, Eelco},
  title =	{{IceDust: Incremental and Eventual Computation of Derived Values in Persistent Object Graphs}},
  booktitle =	{30th European Conference on Object-Oriented Programming (ECOOP 2016)},
  pages =	{11:1--11:26},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-014-9},
  ISSN =	{1868-8969},
  year =	{2016},
  volume =	{56},
  editor =	{Krishnamurthi, Shriram and Lerner, Benjamin S.},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ECOOP.2016.11},
  URN =		{urn:nbn:de:0030-drops-61059},
  doi =		{10.4230/LIPIcs.ECOOP.2016.11},
  annote =	{Keywords: Incremental Computing, Data Modeling, Domain Specific Language}
}
Document
DOI: 10.4230/LIPIcs.ECOOP.2016.20
Scopes Describe Frames: A Uniform Model for Memory Layout in Dynamic Semantics

Authors: Casper Bach Poulsen, Pierre Néron, Andrew Tolmach, and Eelco Visser

Published in: LIPIcs, Volume 56, 30th European Conference on Object-Oriented Programming (ECOOP 2016)

Abstract
Semantic specifications do not make a systematic connection between the names and scopes in the static structure of a program and memory layout, and access during its execution. In this paper, we introduce a systematic approach to the alignment of names in static semantics and memory in dynamic semantics, building on the scope graph framework for name resolution. We develop a uniform memory model consisting of frames that instantiate the scopes in the scope graph of a program. This provides a language-independent correspondence between static scopes and run-time memory layout, and between static resolution paths and run-time memory access paths. The approach scales to a range of binding features, supports straightforward type soundness proofs, and provides the basis for a language-independent specification of sound reachability-based garbage collection.
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Casper Bach Poulsen, Pierre Néron, Andrew Tolmach, and Eelco Visser. Scopes Describe Frames: A Uniform Model for Memory Layout in Dynamic Semantics. In 30th European Conference on Object-Oriented Programming (ECOOP 2016). Leibniz International Proceedings in Informatics (LIPIcs), Volume 56, pp. 20:1-20:26, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2016)

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@InProceedings{bachpoulsen_et_al:LIPIcs.ECOOP.2016.20,
  author =	{Bach Poulsen, Casper and N\'{e}ron, Pierre and Tolmach, Andrew and Visser, Eelco},
  title =	{{Scopes Describe Frames: A Uniform Model for Memory Layout in Dynamic Semantics}},
  booktitle =	{30th European Conference on Object-Oriented Programming (ECOOP 2016)},
  pages =	{20:1--20:26},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-014-9},
  ISSN =	{1868-8969},
  year =	{2016},
  volume =	{56},
  editor =	{Krishnamurthi, Shriram and Lerner, Benjamin S.},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ECOOP.2016.20},
  URN =		{urn:nbn:de:0030-drops-61140},
  doi =		{10.4230/LIPIcs.ECOOP.2016.20},
  annote =	{Keywords: Dynamic semantics, scope graphs, memory layout, type soundness, operational semantics}
}
Document
DOI: 10.4230/DARTS.2.1.10
Scopes Describe Frames: A Uniform Model for Memory Layout in Dynamic Semantics (Artifact)

Authors: Casper Bach Poulsen, Pierre Néron, Andrew Tolmach, and Eelco Visser

Published in: DARTS, Volume 2, Issue 1, Special Issue of the 30th European Conference on Object-Oriented Programming (ECOOP 2016)

Abstract
Our paper introduces a systematic approach to the alignment of names in the static structure of a program, and memory layout and access during its execution. We develop a uniform memory model consisting of frames that instantiate the scopes in the scope graph of a program. This provides a language-independent correspondence between static scopes and run-time memory layout, and between static resolution paths and run-time memory access paths. The approach scales to a range of binding features, supports straightforward type soundness proofs, and provides the basis for a language-independent specification of sound reachability-based garbage collection. This Coq artifact showcases how our uniform model for memory layout in dynamic semantics provides structure to type soundness proofs. The artifact contains type soundness proofs mechanized in Coq for (supersets of) all languages in the paper. The type soundness proofs rely on a language-independent framework formalizing scope graphs and frame heaps.
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Casper Bach Poulsen, Pierre Néron, Andrew Tolmach, and Eelco Visser. Scopes Describe Frames: A Uniform Model for Memory Layout in Dynamic Semantics (Artifact). In Special Issue of the 30th European Conference on Object-Oriented Programming (ECOOP 2016). Dagstuhl Artifacts Series (DARTS), Volume 2, Issue 1, pp. 10:1-10:3, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2016)

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@Article{bachpoulsen_et_al:DARTS.2.1.10,
  author =	{Bach Poulsen, Casper and Néron, Pierre and Tolmach, Andrew and Visser, Eelco},
  title =	{{Scopes Describe Frames: A Uniform Model for Memory Layout in Dynamic Semantics (Artifact)}},
  pages =	{10:1--10:3},
  journal =	{Dagstuhl Artifacts Series},
  ISSN =	{2509-8195},
  year =	{2016},
  volume =	{2},
  number =	{1},
  editor =	{Bach Poulsen, Casper and Néron, Pierre and Tolmach, Andrew and Visser, Eelco},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DARTS.2.1.10},
  URN =		{urn:nbn:de:0030-drops-61314},
  doi =		{10.4230/DARTS.2.1.10},
  annote =	{Keywords: Dynamic semantics, scope graphs, memory layout, type soundness, operational semantics}
}
Document
DOI: 10.4230/LIPIcs.RTA.2015.365
DynSem: A DSL for Dynamic Semantics Specification

Authors: Vlad Vergu, Pierre Neron, and Eelco Visser

Published in: LIPIcs, Volume 36, 26th International Conference on Rewriting Techniques and Applications (RTA 2015)

Abstract
The formal semantics of a programming language and its implementation are typically separately defined, with the risk of divergence such that properties of the formal semantics are not properties of the implementation. In this paper, we present DynSem, a domain-specific language for the specification of the dynamic semantics of programming languages that aims at supporting both formal reasoning and efficient interpretation. DynSem supports the specification of the operational semantics of a language by means of statically typed conditional term reduction rules. DynSem supports concise specification of reduction rules by providing implicit build and match coercions based on reduction arrows and implicit term constructors. DynSem supports modular specification by adopting implicit propagation of semantic components from I-MSOS, which allows omitting propagation of components such as environments and stores from rules that do not affect those. DynSem supports the declaration of native operators for delegation of aspects of the semantics to an external definition or implementation. DynSem supports the definition of auxiliary meta-functions, which can be expressed using regular reduction rules and are subject to semantic component propagation. DynSem specifications are executable through automatic generation of a Java-based AST interpreter.
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Vlad Vergu, Pierre Neron, and Eelco Visser. DynSem: A DSL for Dynamic Semantics Specification. In 26th International Conference on Rewriting Techniques and Applications (RTA 2015). Leibniz International Proceedings in Informatics (LIPIcs), Volume 36, pp. 365-378, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2015)

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@InProceedings{vergu_et_al:LIPIcs.RTA.2015.365,
  author =	{Vergu, Vlad and Neron, Pierre and Visser, Eelco},
  title =	{{DynSem: A DSL for Dynamic Semantics Specification}},
  booktitle =	{26th International Conference on Rewriting Techniques and Applications (RTA 2015)},
  pages =	{365--378},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-939897-85-9},
  ISSN =	{1868-8969},
  year =	{2015},
  volume =	{36},
  editor =	{Fern\'{a}ndez, Maribel},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.RTA.2015.365},
  URN =		{urn:nbn:de:0030-drops-52080},
  doi =		{10.4230/LIPIcs.RTA.2015.365},
  annote =	{Keywords: programming languages, dynamic semantics, reduction semantics, semantics engineering, IDE, interpreters, modularity}
}
Document
DOI: 10.4230/DagRep.5.2.26
Domain-Specific Languages (Dagstuhl Seminar 15062)

Authors: Sebastian Erdweg, Martin Erwig, Richard F. Paige, and Eelco Visser

Published in: Dagstuhl Reports, Volume 5, Issue 2 (2015)

Abstract
This report documents the program and outcomes of Dagstuhl Seminar 15062 “Domain-Specific Languages”, which took place February 1-6, 2015. The seminar was motivated on the one hand by the high interest in domain-specific languages in academia and industry and on the other hand by the observation that the community is divided into largely disconnected subdisciplines (e.g., internal, external, visual, model-driven). The seminar included participants across these subdisciplines and included overview talks, technical talks, demos, discussion groups, and an industrial panel. This report collects the abstracts of talks and other activities at the seminar and summarizes the outcomes of the seminar.
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Sebastian Erdweg, Martin Erwig, Richard F. Paige, and Eelco Visser. Domain-Specific Languages (Dagstuhl Seminar 15062). In Dagstuhl Reports, Volume 5, Issue 2, pp. 26-43, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2015)

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@Article{erdweg_et_al:DagRep.5.2.26,
  author =	{Erdweg, Sebastian and Erwig, Martin and Paige, Richard F. and Visser, Eelco},
  title =	{{Domain-Specific Languages (Dagstuhl Seminar 15062)}},
  pages =	{26--43},
  journal =	{Dagstuhl Reports},
  ISSN =	{2192-5283},
  year =	{2015},
  volume =	{5},
  number =	{2},
  editor =	{Erdweg, Sebastian and Erwig, Martin and Paige, Richard F. and Visser, Eelco},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagRep.5.2.26},
  URN =		{urn:nbn:de:0030-drops-50434},
  doi =		{10.4230/DagRep.5.2.26},
  annote =	{Keywords: Internal DSLs, External DSLs, Domain-specific modeling, Extensible languages, Language workbenches, Textual/graph-based/visual languages, Language design, Language implementation techniques}
}
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