Eclipse IDE for Scala (2.9 story)
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This document discusses the goals and progress of integrating the full Scala compiler into Eclipse for improved Scala IDE features like error highlighting and code completion. It aims for reliability and responsiveness over new features. The team is working on merging codebases from Eclipse 2.8 and 2.9 versions and releasing a solid 2.0 version before adding more features in 2.1.
Eclipse IDE for Scala (2.9 story)
- 1. Eclipse IDE for Scala the 2.9 story Iulian Dragos 1
- 2. Credits 2
- 3. Eugene Vigdorchik Miles Sabin Martin Odersky Hubert Plociniczak Mirko Stocker and many more: Matt Russell, Josh Suereth, David Bernard 3 Daniel Ratiu, Donna Malayeri..
- 4. Goals • work with large projects/files • Scala compiler (80k LOC), 4-5000 LOC/file • advanced use of the type system • path-dependent types, self-types, mix-ins • reliable (no crashes/lock ups) • responsive (never wait when typing) 4
- 5. Howto? • mixed team with compiler and IDE expertise • ScalaSolutions/Typesafe involvement started around September 2010 • Martin, Eugene and Iulian • branch ‘wip_experiment’ in the scala-ide repo 5
- 6. • use the full-blown Scala compiler for: • interactive error highlight, completion, hyperlinking • turning Scala symbols into Java model elements 6
- 7. • Why? • reuse (type-checker == 1-2 person years) • consistency • Why not? • SPEED • (no) support for different Scala versions 7
- 8. Presentation Compiler 8
- 9. • asynchronous • interruptible • targeted • stop after type-checking 9
- 10. Presentation Compiler Eclipse Threads Thread Work Queue AskTypeAt 10
- 11. Presentation Compiler Eclipse Threads Thread Work Queue 11
- 12. Presentation Compiler Eclipse Threads Thread Work Queue AskTypeCompletion AskTypeAt ... 12
- 13. Presentation Compiler Eclipse Threads Thread Work Queue AskTypeCompletion AskTypeAt ... Result is communicated through a SyncVar 12
- 14. • All compiler activity happens on PC thread • Background compile loaded files when work queue is empty • Check work queue when type checker reaches “safe-points” in the AST • Drop everything when a file is changed (AskReload) 13
- 16. • 1 type-checker run / instance --> 100s of type-check runs / minute • memory leaks • side-effects/state • out-of-order and targeted type-checking 15
- 17. • compiler changes needed • 2.9 compiler has them • what about 2.8? • David Bernard ‘backports’ • 2.8.2 preview available now! 16
- 18. Goals, again • Reliability, responsiveness over features • Create a solid foundation for adding features 17
- 19. Versions • wip_experiment • feature freeze, focus on getting the basics right • wip_exp_backports • backported many patches • new features (SoC - highlight implicits) 18
- 20. Versioning 2.8 2.9 wip_experiment 2.0.0-beta-28 2.0.0-beta-29 wip_exp_backport 1.0.0-milestones ? 19
- 21. 20 Roadmap
- 22. • MERGE the two code bases • add features on the solid 2.x base 21
- 23. • 2.0 final release • SBT-based builder/SBT console • REPL improvements • Find References • better testing • sketch a Scala tools API 22
- 24. • 2.1 • Scala aware debugger • scalatest/specs integration • Better refactoring 23
- 25. 24