SetILInstrumentedCodeMap generates wrong IL offset?

Question

Hi.

 

I use Profiling library to modify IL at runtime. In fact, I only add some IL stuff at the beginning of some methods.

To be able to debug original code as before, I have to shift IL instructions of the amount of code I add at the beggining of the method (offset).

I change IL code as soon as assemblies are loaded (AssemblyLoadFinished), but I have to wait method compilation to native to be done to retreive original offsets (JITCompilationFinished).

Then, I remap every ilOffset (oldOffset of a COR_IL_MAP) to ilOffset + offset (newOffset of a COR_IL_MAP) calling SetILInstrumentedCodeMap, skipping prolog and epilog mapping.

 

Problem is that I can see 3 lines in 'Disassembly' view within VS2010 when I debug non-instrumented code: '{', my first line of code and my second line of code (I only have two lines of code in the instrumented method of my testing project).

When I debug the instrumented method (the same one), I have 18 ilOffset (+2 for prolog and epilog I do not care) that I shift with the same value: 84 bytes, I do not see any line for '{'. I see lines for my two code lines, but they are too far! What's wrong?

 

Thanks for your help.

Answer 1

I am afraid this issue will take quite a bit of time to work on, and as such your question falls into the paid support category which requires a more in-depth level of support.  Please visit this link to see the various paid support options that are available to better meet your needs:  http://support.microsoft.com/default.aspx?id=fh;en-us;offerprophone.

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Answer 2

I may be able to help

I use SetILInstrumentedCodeMap in JITCompilationStarted after I have updated the methodbody with a new instrumented method body (code coverage)

you can find some sample code here

https://github.com/sawilde/DDD2011_ProfilerDemo

 

Answer 3

Hi Ludovic

Did you get an answer?

I think under debug the first instruction is a NOP and this coincides with the first { - so i'd try and instrument the code such you map

0 => 0

1 =>  1 + offset