How to see JIT-Compiled code in .NET VM (CLR)

Question

How can I have a trace of native code generated by the JIT-Compiler ?

Thanks

Answer 1

If you just use Debug->Windows->Disassembly on a standard Debug or Release exe, without modifying Visual Studio Debugging options, you will just see a version of non optimized .NET code.

Have a look at this article "How to see the Assembly code generated by the JIT using Visual Studio". It explains how to inspect generated JIT optimized code.

One relevant quote from the article:

3. Configure the Debugging Options in Visual Studio to allow the JIT to generate optimized code and to allow you to debug the optimized code.

Go to Tools => Options => Debugging => General · Make sure that box labeled ‘Suppress JIT optimization on module load’ is Unchecked.

· Make sure that the box labeled ‘Enable Just My Code’ is Unchecked.

Answer 2

In Visual Studio place a breakpoint in the code and start debugging. When it breaks, open the Disassembly window (Debug > Windows > Disassembly or Alt+Ctrl+D).

Answer 3

You should look for the files output from the NGen tool. NGen compiles and stores pre-jitted versions of assemblies in the Global Assembly Cache.