.NET compiler platform codename Roslyn
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1. Roslyn is the .NET compiler platform that allows compiling code on-demand as a service. 2. It started in 2008 and is now included in Visual Studio 2015, allowing developers to interact with code in new ways like through a REPL-like experience and syntax/semantic APIs. 3. Roslyn provides capabilities for analyzing code through diagnostics and code fixes, and also enables scripting scenarios.
.NET compiler platform codename Roslyn
- 1. .NET compiler platform Roslyn Piotr Benetkiewicz ais.pl
- 2. Agenda ● Introduction, background, history ● Roslyn in new VS 2015 ● Syntax API ● Semantics ● Compilation ● Analyzers, Fixes ● Scripting
- 3. When, what, why ● .NET compiler platform ● Compiler as a service, csc.exe API ● Started 2008 (PDC, Los Angeles, CA) ● Codeplex -> Github ● Now in beta RC on nuget ● VS 2015
- 4. What, when, why cont. ● “Poor” csc architecture o Different compiler forks for different tasks o clear C# and VB separation ● C++ vs. .NET languages Have you ever tried cat food?
- 5. What, when, why cont.
- 8. Roslyn must ● Have great throughput ● Be error insensitive ● Have great sense of error scope ● Support REPL-like scenarios ● be VS-agnostic
- 9. Getting started ● VS 2015 CTP6 o watch out for side-by-side installation! ● VS SDK ● Install-Package Microsoft.CodeAnalysis -Pre ● Optional: o .NET Compiler Platform SDK Templates o Syntax Visualizer extension
- 10. DEMO
- 11. Syntax
- 12. Syntax cont. ● SyntaxTree - base abstraction, immutable ● Building ST o from source o using factory methods ● Navigating ST o Members and casting o OfType<> o CSharpSyntaxWalker
- 13. DEMO
- 14. Syntax modules are smart
- 15. Syntax modules are smart
- 16. Semantics Yesterday a parrot will drive a bitter, encrypted car. ● english words ● punctuation ● yet it doesn’t make sense… ● binding
- 17. Semantics cont. ● Get the real meaning of the abstract content ● Linking to a Symbol ● Needs context: o user defined (your code!) o external metadata (ex. mscorlib) ● Reflection on steroids (not at runtime) o GetSymbolInfo(), GetEnclosingSymbol() o Control flow analysis o Can be speculative
- 18. Semantics is smart too! “Property is inaccessible due to its protection level” ● GetSpeculativeSymbolInfo() ● ISymbolInfo.CandidateSymbols
- 19. DEMO
- 20. Analyzers, code fixes ● VS project templates ● Derive from DiagnosticAnalyzer and apply DiagnosticAnalyzer attribute ● Derive from CodeFixProvider and apply ExportCodeFixProvider attribute ● Use “Add analyzer” in VS, nuget or csc.exe
- 21. Analyzers, code fixes cont.
- 22. DEMO
- 23. What to expect after Roslyn ships? ● Better vanilla VS user experience ● Alternative IDEs Editors (OmniSharp) ● Even richer toolset (CI, metrics, diagnostics) ● Scripting (sciptcs) ● Exciting community and commercial projects o code mutation o ConfigR
- 24. Thank you ● @pbenetkiewicz ● http://benetkiewicz.github.io/blog/ ● pbenetkiewicz@gmail.com, piotr@ais.pl