SCALA 2020
11th ACM SIGPLAN International Scala Symposium (SCALA 2020)
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11th ACM SIGPLAN International Scala Symposium (SCALA 2020), November 13, 2020, Virtual, USA

SCALA 2020 – Preliminary Table of Contents

Contents - Abstracts - Authors


Title Page

Message from the Chairs




ScalaPy: Seamless Python Interoperability for Cross-Platform Scala Programs
Shadaj Laddad and Koushik Sen
(University of California at Berkeley, USA)
In recent years, Python has become the language of choice for data scientists with its many high-quality scientific libraries and Scala has become the go-to language for big data systems. In this paper, we bridge these languages with ScalaPy, a system for interoperability between Scala and Python. With ScalaPy, developers can use Python libraries in Scala by treating Python values as Scala objects and exposing Scala values to Python. ScalaPy supports both Scala on the JVM and Scala Native, enabling its usage from data experiments in interactive notebook environments to performance-critical production systems. In this paper, we explore the challenges involved with mixing the semantics and implementations of these two disparate languages.

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Semantics-Preserving Inlining for Metaprogramming
Nicolas Stucki, Aggelos Biboudis, Sébastien Doeraene, and Martin Odersky
(EPFL, Switzerland; Scala Center, Switzerland)
Inlining is used in many different ways in programming languages: some languages use it as a compiler-directive solely for optimization, some use it as a metaprogramming feature, and others lay their design in-between. This paper presents inlining through the lens of metaprogramming and we describe a powerful set of metaprogramming constructs that help programmers to unfold domain-specific decisions at compile-time. In a multi-paradigm language like Scala, the concern for generality of inlining poses several interesting questions and the challenge we tackle is to offer inlining without changing the model seen by the programmer. In this paper, we explore these questions by explaining the rationale behind the design of Scala-3's inlining capability and how it relates to its metaprogramming architecture.

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Kaizen: A Scalable Concolic Fuzzing Tool for Scala
Mohammadreza Ashouri
Scala is an open-source programming language created by Martin Odersky in 2001 and released under the BSD or Berkeley Software Distribution license. The language consolidates object-oriented and functional programming in one high-level and robust language. Scala also maintains static types that help to reduce tricky errors during the execution time. In this paper, we introduce ”Kaizen” as a practical security analysis tool that works based on concolic fuzzing for evaluating real-world Scala applications.
To evaluated our approach, we analyzed 1,000 popular Scala projects existing on GitHub. As a result, Kaizen could report and exploit 101 security issues; some of those have not been reported before. Furthermore, our performance analysis outcome on the ScalaBench test suite demonstrates a 49% runtime overhead that proves Kaizen’s usefulness for security testing in the Scala ecosystem.

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