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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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