Ocelot Rela%onal Logic in a Solver-Aided Language James Bornholt - - PowerPoint PPT Presentation

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Feb 21, 2024 164 likes •229 views

Ocelot Rela%onal Logic in a Solver-Aided Language James Bornholt http://ocelot.tools Emina Torlak University of Washington all d: Dir | lone d.~contents becomes (all ([d Dir]) (lone (join d (~ contents)))) Ocelot is a DSL for rela.onal

SLIDE 1

Ocelot

Rela%onal Logic in a Solver-Aided Language

James Bornholt Emina Torlak

University of Washington

http://ocelot.tools

SLIDE 2

Ocelot is a DSL for rela.onal logic, embedded in the Rose7e solver-aided language

all d: Dir | lone d.~contents

becomes

(all ([d Dir]) (lone (join d (~ contents)))) (define X (join d (~ contents))) (println X) > (join d (~ contents)) Analysis backend is SMT (Z3) Supports synthesis of relaFonal expressions, and combinaFon with

ther constraints.

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Synthesis PowerPC x86 768 tests

[Alglave et al, CAV’10]

10 tests ✓ 12 seconds ✓ 2 seconds

Not equivalent to TSO!

9 new tests 4 new tests Ambiguity

Not equivalent to published model! Search space: 21406 Search space: 2624 sync, lwsync, etc. mfence, xchg

Ocelot can synthesize and debug large memory model specificaFons

[Bornholt & Torlak, PLDI 2017]

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Ocelot is fast at both verificaFon and higher-order queries

Time (s) 10 20 30 40 Alloy Ocelot Herd

Verifica.on

As fast as a custom memory model decision procedure Time (s) 0.1 1 10 100 1000 Problems Solved 10 20 30 40 50

Ocelot Alloy*

Equivalence

Average 22× faster than Alloy*

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