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SLE 2020
Sun 15 - Fri 20 November 2020 Online Conference
co-located with SPLASH 2020
Mon 16 Nov 2020 14:00 - 14:20 at SPLASH-III - Chair(s): Vadim Zaytsev
Tue 17 Nov 2020 02:00 - 02:20 at SPLASH-III - Chair(s): Vadim Zaytsev

Swift is a modern general-purpose programming language, designed to be a replacement for C-based languages. Although primarily directed at development of applications for Apple's operating systems, Swift's adoption has been growing steadily in other domains, ranging from server-side services to machine learning. This success can be partly attributed to a rich type system that enables the design of safe, fast, and expressive programming interfaces. Unfortunately, this richness comes at the cost of complexity, setting a high entry barrier to exploit Swift's full potential. Furthermore, existing documentation typically only relies on examples, leaving new users with little help to build a deeper understanding of the underlying rules and mechanisms.

This paper aims to tackle this issue by laying out the foundations for a formal framework to reason about Swift's type system. We introduce Featherweight Swift, a minimal language stripped of all features not essential to describe its typing rules. Featherweight Swift features classes and protocol inheritance, supports retroactive modeling, and emulates Swift's overriding mechanisms. Yet its formalization fits on a few pages. We present Featherweight Swift's syntax and semantics. We then elaborate on the usability of our framework to reason about Swift's features, future extensions, and implementation by discussing a bug in Swift's compiler, discovered throughout the design of our calculus.

Mon 16 Nov

Displayed time zone: Central Time (US & Canada) change

13:00 - 14:20
SLE at SPLASH-III +12h
Chair(s): Vadim Zaytsev University of Twente, Netherlands
13:00
20m
Talk
Test Case Generation from Context-Free Grammars using Generalized Traversal of LR-Automata
SLE
Christoff Rossouw Stellenbosch University, South Africa, Bernd Fischer Stellenbosch University, South Africa
Link to publication DOI Media Attached
13:20
20m
Talk
Grammar-Based Testing for Little Languages: An Experience Report with Student Compilers
SLE
Phillip van Heerden Stellenbosch University, Moeketsi Raselimo Stellenbosch University, South Africa, Konstantinos (Kostis) Sagonas Uppsala University, Sweden, Bernd Fischer Stellenbosch University, South Africa
Link to publication DOI Media Attached
13:40
20m
Talk
An Interactive Feedback System for Grammar Development (Tool Paper)
SLE
Chelsea Barraball Stellenbosch University, South Africa, Moeketsi Raselimo Stellenbosch University, South Africa, Bernd Fischer Stellenbosch University, South Africa
Link to publication DOI Media Attached
14:00
20m
Talk
Featherweight Swift: A Core Calculus for Swift’s Type System
SLE
Dimitri Racordon University of Geneva, Switzerland, Didier Buchs University of Geneva, Switzerland
Link to publication DOI Media Attached

Tue 17 Nov

Displayed time zone: Central Time (US & Canada) change

01:00 - 02:20
SLE at SPLASH-III
Chair(s): Vadim Zaytsev University of Twente, Netherlands
01:00
20m
Talk
Test Case Generation from Context-Free Grammars using Generalized Traversal of LR-Automata
SLE
Christoff Rossouw Stellenbosch University, South Africa, Bernd Fischer Stellenbosch University, South Africa
Link to publication DOI Media Attached
01:20
20m
Talk
Grammar-Based Testing for Little Languages: An Experience Report with Student Compilers
SLE
Phillip van Heerden Stellenbosch University, Moeketsi Raselimo Stellenbosch University, South Africa, Konstantinos (Kostis) Sagonas Uppsala University, Sweden, Bernd Fischer Stellenbosch University, South Africa
Link to publication DOI Media Attached
01:40
20m
Talk
An Interactive Feedback System for Grammar Development (Tool Paper)
SLE
Chelsea Barraball Stellenbosch University, South Africa, Moeketsi Raselimo Stellenbosch University, South Africa, Bernd Fischer Stellenbosch University, South Africa
Link to publication DOI Media Attached
02:00
20m
Talk
Featherweight Swift: A Core Calculus for Swift’s Type System
SLE
Dimitri Racordon University of Geneva, Switzerland, Didier Buchs University of Geneva, Switzerland
Link to publication DOI Media Attached