Verifying message-passing programs with dependent behavioural types


Concurrent and distributed programming is notoriously hard. Modern languages and toolkits ease this difficulty by offering message-passing abstractions, such as actors (e.g., Erlang, Akka, Orleans) or processes (e.g., Go): they allow for simpler reasoning w.r.t. shared-memory concurrency, but do not ensure that a program implements a given specification. To address this challenge, it would be desirable to specify and verify the intended behaviour of message-passing applications using types, and ensure that, if a program type-checks and compiles, then it will run and communicate as desired. We develop this idea in theory and practice. We formalise a concurrent functional language λπ, with a new blend of behavioural types (from π-calculus theory), and dependent function types (from the Dotty programming language, a.k.a. the future Scala 3). Our theory yields four main payoffs: (1) it verifies safety and liveness properties of programs via typeś level model checking; (2) unlike previous work, it accurately verifies channel-passing (covering a typical pattern of actor programs) and higher-order interaction (i.e., sending/receiving mobile code); (3) it is directly embedded in Dotty, as a toolkit called Effpi, offering a simplified actor-based API; (4) it enables an efficient runtime system for Effpi, for highly concurrent programs with millions of processes/actors.

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Additional Information: © ACM, 2019. This is the author's version of the work. It is posted here by permission of ACM for your personal use. Not for redistribution.
Event Title: 40th ACM SIGPLAN Conference on Programming Language Design and Implementation, PLDI 2019
Event Type: Other
Event Dates: 2019-06-22 - 2019-06-26
Uncontrolled Keywords: Actors,Behavioural types,Dependent types,Dotty,Model checking,Processes,Scala,Temporal logic,Software
ISBN: 9781450367127
Last Modified: 06 May 2024 07:44
Date Deposited: 29 Apr 2019 13:40
Full Text Link: http://mrg.doc. ... 19-preprint.pdf
Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Conference contribution
Published Date: 2019-06-08
Accepted Date: 2019-04-24
Authors: Scalas, Alceste (ORCID Profile 0000-0002-1153-6164)
Yoshida, Nobuko
Benussi, Elias



Version: Accepted Version

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