ReJIT for Realz?!

Yes!  Check out this new video on channel 9 for the scoop:

https://channel9.msdn.com/Shows/Going+Deep/CLR-45-David-Broman-Inside-Re-JIT

In the upcoming .NET 4.5, we do indeed plan to include a limited form of ReJIT that will allow diagnostic tools to perform IL Rewriting after the code has been JITted—by instructing the CLR, via the Profiling API, to JIT the (now instrumented) method again (i.e., ReJIT it! ).

If you want to play with this feature, it is available in the .NET 4.5 Developer Preview.  You can search for it on the Microsoft Download Center, and you’ll find the .NET 4.5-only link and the full Visual Studio 11 link:

https://www.microsoft.com/download/en/details.aspx?id=27537
https://www.microsoft.com/download/en/details.aspx?displaylang=en&id=27543

It will be tough to try it out now, though, as we don’t have docs or samples yet.  And note that there are several limitations, some of which are touched on in the video.  You’ll need to look through corprof.idl and turn on your mind-reading skills to figure it out.  But I will have a lot more to say about the feature and how you can use it in upcoming posts right here.

Comments

• Anonymous
  September 26, 2011
  Congratulations!  I know how happy your customers will be and how hard you worked to get this implemented.

• Anonymous
  July 30, 2014
  Hi..!! The links are not working.. please recheck..