Roslyn – (awesome) open source C# compiler

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Roslyn – (awesome) open source C# compiler Toni Petrina Ekobit d.o.o. @to_pe [email protected]

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Agenda • Introduction • Awesome things • Awesome thing 1 • Awesome thing 2 • Awesome thing 3 • ... • Conclusion

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What is Roslyn?

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Core .NET Next gen JIT (“RyuJIT”) SIMD Runtime Compilers .NET Compiler Platform (“Roslyn”) Languages innovation Windows Desktop Azure and Windows Server Universal projects .NET Native ASP.NET updates Windows Convergence Native compilation Cross-devices Xamarin partnership Web apps .NET support for Azure Mobile Services Cloud Services Openness Windows Store iOS and Android .NET in devices and services

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What is a compiler? • A black box • „It does stuff” • It works „Black box” Source code Assets Binary output

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What is it good for • Parsing • Validating • Semantics • Code rejection

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Reimagining of the C# and VB.NET compilers • Managed code this time • Turn into API • Compiler as a Service • Building blocks for the IDE, tools • Open source (Apache v2) • http://roslyn.codeplex.com

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A thing: Roslyn compiler

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Adding (or removing) language features • Create your own C#++ • Additional language constructs • Improve existing ones • Fork Roslyn first at http://roslyn.codeplex.com

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A thing: Language features

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Danger • Don’t do this for your project/company • Bad for C# culture • Can create DSL variants which you have to learn for particular company

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Basic APIs

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Compiler APIs • Don’t depend on Visual Studio • Syntactic and semantic model for each phase • Immutable

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Also part of the same API • Diagnostic APIs • UI optional • Integrates with other tools (MSBuild, FxCop, StyleCop, etc) • Can be integrated into IDE to give red squiggles or to stop build • Scripting APIs • REPL • Currently MIA • Will return in the future • Not part of the .NET Compiler Platform at the moment

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A thing: Diagnostics

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A thing: Refactoring

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Workspace API • Code analysis • Refactorings • No dependencies on Visual Studio • Tools: • Find All References • Formatting • Code Generation APIs

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How does it all tie together?

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How Roslyn sees your code?

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A thing: Refactorings

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A thing: REPL

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A thing: custom editor

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Honorable mentinos • Scriptcs - http://scriptcs.net/ • Reference Source: • .NET - http://referencesource.microsoft.com/ • Roslyn: http://source.roslyn.codeplex.com/ • Ref12 – jump from source to reference source • Extension: http://visualstudiogallery.msdn.microsoft.com/f89b27c5- 7d7b-4059-adde-7ccc709fa86e • Source code: https://github.com/SLaks/Ref12 • C# Pad – execute C# code online • http://csharppad.com/

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Who is it for, actually? • Developers • Integrate Roslyn into your own flow • Partners • Create, share and sell extensions and tools • Visual Studio team • Visual Studio experience • Everyone, really • Open source

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Links • http://roslyn.codeplex.com • Official Roslyn • http://github.com/mono/roslyn • Mono port