CoreCLR is the OSS release of CLR as we know it. Today we are able to build CLR in Debug configuration, set breakpoints and gather additional logging info available so far only to Microsoft .NET team.

1. #devsum15
Inside CLR –
A New Look to Open Source
CoreCLR
Martin Kulov
www.kulov.net
@kulov martin@kulov.net

4. This repo contains the .NET Core runtime, called CoreCLR, and the base library, called
mscorlib. It includes the garbage collector, JIT compiler, base .NET data types and many
low-level classes.
dotnet/coreclr
This repo contains the .NET Core foundational libraries, called CoreFX. It includes
classes for collections, file systems, console, XML, async and many others.
dotnet/corefx
The .NET Compiler Platform ("Roslyn") provides open-source C# and Visual Basic
compilers with rich code analysis APIs.
dotnet/roslyn
The DNX (a .NET Execution Environment) contains the code required to bootstrap and
run an application, including the compilation system, SDK tools, and the native CLR
hosts.
aspnet/dnx

6. Installing CoreCLR

7. #devsum15@kulov martin@kulov.net
High level steps
Install DNVM
Install .NET Core DNX
DNU restore
Run DNX

8. DNVM
DN
XDN
U
WTF!?

9. #devsum15@kulov martin@kulov.net
Execution Environment
.NET apps need host
They get bootstrapped, jitted, ngened, configured
Hosts: Windows Shell, SQL Server, ASP.NET, IE

10. #devsum15@kulov martin@kulov.net
.NET Execution Environment
The DNX (a .NET Execution Environment) contains the code required to bootstrap and
run an application, including the compilation system, SDK tools, and the native CLR
hosts.
aspnet/dnx

11. #devsum15@kulov martin@kulov.net
Detailed steps
Install DNVM /
@powershell -NoProfile -ExecutionPolicy unrestricted -Command "&{$Branch='dev';iex ((new-object
net.webclient).DownloadString('https://raw.githubusercontent.com/aspnet/Home/dev/dnvminstall.ps1'))}"
Install .NET Core DNX / dnvm install -r coreclr latest -u
Install dependencies / dnu restore
Run DNX / dnx . run
*https://github.com/dotnet/coreclr/blob/master/Documentation/get-dotnetcore-dnx-windows.md

12. Building CoreCLR

13. #devsum15@kulov martin@kulov.net
Prerequisites
CMake - http://www.cmake.org/download
NuGet - https://nuget.org/nuget.exe
Restore NuGet dependencies
*https://github.com/dotnet/coreclr/blob/master/Documentation/windows-instructions.md

14. #devsum15@kulov martin@kulov.net
> git clone https://github.com/dotnet/coreclr
> build.bat clean VS2015
*https://github.com/dotnet/coreclr/blob/master/Documentation/windows-instructions.md

15. #devsum15@kulov martin@kulov.net
> csc.exe csc /nostdlib /noconfig sample.exe …
> CorRun.exe sample.exe
*https://github.com/dotnet/coreclr/blob/master/Documentation/windows-instructions.md

16. DEMO: Debugging CoreCLR

17. Thank you!
martin@kulov.net @kulov https://www.linkedin.com/in/kulov
www.kulov.net