demarkok / pwt

A supplementary Coq formalization for "The Leaky Semicolon" paper

Pomsets w/ Transformers (a Coq formalization)

This repository contains Coq code supplementing the paper Leaky Semicolon: Compositional Semantic Dependencies for Relaxed-Memory Concurrency by Alan Jeffrey, James Riely, Mark Batty, Simon Cooksey, Ilya Kaysin, and Anton Podkopaev.

Building the Project

Requirements

• Coq 8.13.1
• Hahn library (coq-hahn)
• Intermediate Memory Model (coq-imm.1.4)

All required dependencies can be installed via package manager opam.

opam repo add coq-released https://coq.inria.fr/opam/released
opam remote add coq-weakmemory-local -k git https://github.com/weakmemory/local-coq-opam-archive
opam install coq-hahn coq-imm.1.4

Building Manually

To build the project just use make -j command (assuming all dependencies were installed as described above).

Description of the project's files

Basic definitions of the semantics

• Events.v – a definition of events (§4.1)
• Language.v – definitions of statements S and expressions M (§4.1)
• Formula.v – a language of formulas Φ (§4.1)
• Action.v — a definition of actions and related notions (§4.2)
• PredTransformer.v — a definition of predicate transformers (§4.3, Def. 4.2)
• Pomset.v — a definition of pomsets with predicate transformers (§4.3, Def. 4.4)
• Semantics.v — the PwT semantics extended to allow if-closure (§4.3, Fig. 1 and §9.4, Def. 9.6)

Properties of the semantics

• SeqSkipId.v — skip as an identity element for the semicolon operator (§4.3, Lemma 4.5a)
• SeqAssoc.v — associativity of the semicolon operator (§4.3, Lemma 4.5b)
• IfClosure.v — distribution of the if operator over semicolon (§4.3, Lemma 4.6e)

Auxiliary definitions and lemmas

• AuxDef.v, AuxRel.v, SeqBuilder.v