This is an early look at Roslyn

1. Setup Visual Studio with Roslyn demo C:rogram Files (x86)ono-2.8insharp.bat ZoomIt

2. WARNING: NOT A NORMAL DEV4DEVS TALK Codename ‘Roslyn’ robertmaclean www.sadev.co.za ∞ @rmaclean ∞ robert@sadev.co.za

3. What is ‘Roslyn’? Project that will deliver the new VB & C♯ compilers and language services

4. C♯ Compiler Themes C♯ 1.0 : New language for a new platform C♯ 2.0 : Generics, strong typing C♯ 3.0 : Declarative programming C♯ 4: Dynamic programming C♯ “5” : Asynchronous programming Note : C♯ themes != .NET Framework themes C♯ releases != .NET Framework releases C♯ “5” is not an official name

6. PowerShell re-develops the compiler

7. Visual Studio re-developed the compiler.NET Assemblies Source Files Compiler (C++)

8. Roslyn opens the box Compiler API REPL (Read-Eval-Print-Loop) Hosting in other contexts .NET Assemblies Source Files Compiler C# for C# VB for VB

9. What do we get with Roslyn? Managed Compiler VB compiler written in VB C♯ compiler written in C♯ Compiler API REPL Environment “Interactive Window”

10. Compiler API? Syntax Tree Emit API Source Code Compiler API Symbol API Binding & Flow API

11. Syntax Tree - Nodes class C { void M() { } } // C ❏ CompilationUnit TypeDeclaration MethodDeclaration ParameterList Block

12. Syntax Tree - Tokens class C { void M() { } } // C ❏ CompilationUnit TypeDeclaration EOF MethodDeclaration class C { } ParameterList void Block M ( ) { }

13. Syntax Tree - Trivia class C { void M() { } } // C ❏ CompilationUnit TypeDeclaration EOF MethodDeclaration class C { } nbsp EOL EOL //C EOL ParameterList void nbsp Block nbsp.4 M ( ) EOL nbsp.4 { EOL nbsp.4 } EOL

14. Where does Compiler API take us? Binding & Flow API Symbol API Syntax Tree What the IDE understands == The compiler understands

15. What about use normal developers? Where would a Dev4Dev’s talk be without a demo? Problem – NO ROSLYN BITS ARE PUBLIC! Mono to the rescue!

16. When will see ‘Roslyn’ then? Currently in development V1 features locked down Been around building 41 since at least 2008 Nothing official 19 July 2011 - Karen Ng: “To some degree, soon” API out BEFORE product

17. Sources and further reading Get slides & demos at www.sadev.co.za http://stackoverflow.com/questions/4222524/what-would-you-do-with-compiler-as-a-service http://codebetter.com/patricksmacchia/2010/05/31/c-5-and-meta-programming/ http://research.microsoft.com/en-us/events/fs2011 http://social.msdn.microsoft.com/Forums/en-US/async/thread/03a51936-b4fd-4814-9161-46544eda63cf/ http://blogs.msdn.com/b/ericlippert/archive/2010/12/16/hiring-for-roslyn.aspx http://blog.functionalfun.net/2008/10/dynamic-future-of-c-40.html http://channel9.msdn.com/Shows/Checking-In-with-Erik-Meijer/Checking-In-Eric-Lippert-On-Compiler-Evolution-Designing-C-and-Blogging http://castroller.com/Podcasts/NetRocks/2230612-Eric%20Lippert%20Talks%20About%20Project%20Roslyn http://channel9.msdn.com/Shows/Going+Deep/Anders-Hejlsberg-Questions-and-Answers http://blogs.msdn.com/b/lisa/archive/2011/03/29/teched-middle-east-2011.aspx http://www.mono-project.com/CsharpRepl http://www.sharpcrafters.com

18. Questions?