https://github.com/twitter/rsc

Experimental Scala compiler focused on compilation speed
https://github.com/twitter/rsc

Last synced: 3 months ago
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Experimental Scala compiler focused on compilation speed

• Host: GitHub
• URL: https://github.com/twitter/rsc
• Owner: twitter
• License: apache-2.0
• Created: 2017-08-17T17:56:27.000Z (about 7 years ago)
• Default Branch: master
• Last Pushed: 2021-10-21T17:27:10.000Z (about 3 years ago)
• Last Synced: 2024-05-12T01:31:50.208Z (6 months ago)
• Language: Scala
• Homepage:
• Size: 3.18 MB
• Stars: 1,243
• Watchers: 78
• Forks: 54
• Open Issues: 82
• Metadata Files:
  • Readme: README.md
  • Contributing: docs/contributing.md
  • License: LICENSE

Awesome Lists containing this project

• awesome-list - rsc

README

        
# Rsc

Reasonable Scala compiler (also known as Rsc) is an experimental Scala compiler

focused on compilation speed. This project is developed by the Language Tools team at Twitter.

Rsc is not a fork, but a reimplementation of the Scala compiler.

We believe that a performance-oriented rewrite will provide a unique perspective

on compilation costs introduced by various Scala features and idioms -

something that is currently very hard to quantify in existing compilers.

With Rsc, our mission is to complement official compilers and assist with their

evolution through our experiments. We are aiming to discover actionable

insight into Scala compiler architecture and language design that will help

compiler developers at Lightbend and EPFL to optimize their compilers

for the benefit of the entire Scala community.

## Goals

* Dramatically improve Scala compilation performance

* Study compilation time overhead of various Scala features

* Identify a subset of Scala that can be compiled with reasonable speed

* Facilitate knowledge transfer to other Scala compilers

## Non-goals

* Full backward compatibility

(consider [Lightbend Scala](https://github.com/scala/scala) instead)

* New language features

(consider [Dotty](https://github.com/lampepfl/dotty) and

[Typelevel Scala](https://github.com/typelevel/scala) instead)

* Improvements to the type system

(consider [Dotty](https://github.com/lampepfl/dotty) and

[Typelevel Scala](https://github.com/typelevel/scala) instead)

* Runtime performance (will be addressed independently)

## Status

* We expanded the [supported subset of Scala](docs/language.md) and

are now using [Twitter Util](https://github.com/twitter/util)

in our experiments.

* We implemented support for loading dependencies based on

[the SemanticDB format](https://github.com/scalameta/scalameta/blob/master/semanticdb/semanticdb3/semanticdb3.md)

provided by [Scalameta](https://github.com/scalameta/scalameta).

* Our [prototype outliner](docs/compiler.md) can compute signatures of

public and protected definitions and save them in [the ScalaSignature format](https://github.com/scala/scala/blob/v2.11.12/src/reflect/scala/reflect/internal/pickling/PickleFormat.scala)

that enables interoperability with the Scala compiler.

* In the future, we will proceed with development according to

[our roadmap](docs/roadmap.md).

## Documentation

* [Getting started](docs/gettingstarted.md)

* [Language](docs/language.md)

* [Compiler](docs/compiler.md)

* [Performance](docs/performance.md)

* [Roadmap](docs/roadmap.md)

* [Contributing](docs/contributing.md)

* [Related work](docs/relatedwork.md)

## Credits

Our project is inspired by the work of Martin Odersky, Grzegorz Kossakowski

and Denys Shabalin. Martin inspiringly showed that in this day and age it is still

possible to [write a Scala compiler from scratch](https://github.com/lampepfl/dotty).

Greg unexpectedly demonstrated that

[compiling Scala can be blazingly fast](https://github.com/gkossakowski/kentuckymule).

Denys shockingly revealed that

[Scala apps can have instant startup time](https://github.com/scala-native/scala-native).