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DOI: 10.4230/LIPIcs.ECOOP.2016.7

Interprocedural Type Specialization of JavaScript Programs Without Type Analysis

Authors: Maxime Chevalier-Boisvert and Marc Feeley

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

Abstract

Previous work proposed lazy basic block versioning, a technique for just-in-time compilation of dynamic languages which we believe represents an interesting point in the design space. Basic block versioning is simple to implement, simple enough that a single developer can build a complete just-in-time compiler for JavaScript in a year, yet it performs surprisingly well as it propagates context-sensitive type information to generate type-specialized code on the fly. In this paper, we demonstrate that lazy basic block versioning can be extended is simple ways to propagate type information across function call boundaries. This gives some of the benefits of whole-program analysis, or a tracing compiler, without having to implement the machinery for either. We have implemented this proposal in the Higgs JavaScript virtual machine and report on the empirical evaluation of this system on a set of industry standard benchmarks. The approach eliminates 94.3 of dynamic type tests on average, which we show is more than what is achievable with any static whole-program type analysis.

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Maxime Chevalier-Boisvert and Marc Feeley. Interprocedural Type Specialization of JavaScript Programs Without Type Analysis. In 30th European Conference on Object-Oriented Programming (ECOOP 2016). Leibniz International Proceedings in Informatics (LIPIcs), Volume 56, pp. 7:1-7:24, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2016)

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@InProceedings{chevalierboisvert_et_al:LIPIcs.ECOOP.2016.7,
  author =	{Chevalier-Boisvert, Maxime and Feeley, Marc},
  title =	{{Interprocedural Type Specialization of JavaScript Programs Without Type Analysis}},
  booktitle =	{30th European Conference on Object-Oriented Programming (ECOOP 2016)},
  pages =	{7:1--7:24},
  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.2016.7},
  URN =		{urn:nbn:de:0030-drops-61019},
  doi =		{10.4230/LIPIcs.ECOOP.2016.7},
  annote =	{Keywords: Just-In-Time Compilation, Dynamic Language, Optimization, Object Oriented, JavaScript}
}

Document

DOI: 10.4230/LIPIcs.ECOOP.2015.101

Simple and Effective Type Check Removal through Lazy Basic Block Versioning

Authors: Maxime Chevalier-Boisvert and Marc Feeley

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

Abstract

Dynamically typed programming languages such as JavaScript and Python defer type checking to run time. In order to maximize performance, dynamic language VM implementations must attempt to eliminate redundant dynamic type checks. However, type inference analyses are often costly and involve tradeoffs between compilation time and resulting precision. This has lead to the creation of increasingly complex multi-tiered VM architectures. This paper introduces lazy basic block versioning, a simple JIT compilation technique which effectively removes redundant type checks from critical code paths. This novel approach lazily generates type-specialized versions of basic blocks on-the-fly while propagating context-dependent type information. This does not require the use of costly program analyses, is not restricted by the precision limitations of traditional type analyses and avoids the implementation complexity of speculative optimization techniques. We have implemented intraprocedural lazy basic block versioning in a JavaScript JIT compiler. This approach is compared with a classical flow-based type analysis. Lazy basic block versioning performs as well or better on all benchmarks. On average, 71% of type tests are eliminated, yielding speedups of up to 50%. We also show that our implementation generates more efficient machine code than TraceMonkey, a tracing JIT compiler for JavaScript, on several benchmarks. The combination of implementation simplicity, low algorithmic complexity and good run time performance makes basic block versioning attractive for baseline JIT compilers.

Cite as

Maxime Chevalier-Boisvert and Marc Feeley. Simple and Effective Type Check Removal through Lazy Basic Block Versioning. In 29th European Conference on Object-Oriented Programming (ECOOP 2015). Leibniz International Proceedings in Informatics (LIPIcs), Volume 37, pp. 101-123, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2015)

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@InProceedings{chevalierboisvert_et_al:LIPIcs.ECOOP.2015.101,
  author =	{Chevalier-Boisvert, Maxime and Feeley, Marc},
  title =	{{Simple and Effective Type Check Removal through Lazy Basic Block Versioning}},
  booktitle =	{29th European Conference on Object-Oriented Programming (ECOOP 2015)},
  pages =	{101--123},
  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.2015.101},
  URN =		{urn:nbn:de:0030-drops-52196},
  doi =		{10.4230/LIPIcs.ECOOP.2015.101},
  annote =	{Keywords: Just-In-Time Compilation, Dynamic Optimization, Type Checking, Code Generation, JavaScript}
}

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Documents authored by Chevalier-Boisvert, Maxime

Interprocedural Type Specialization of JavaScript Programs Without Type Analysis

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Simple and Effective Type Check Removal through Lazy Basic Block Versioning

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