Parsing the COR_PRF_FUNCTION_ARGUMENT_INFO Structure

I'm wondering how I should go about parsing the COR_PRF_FUNCTION_ARGUMENT_INFO structure that is supplied to the callback method of the SetEnterLeaveFunctionHooks3WithInfo function.

From my understand the structure contains a group of memory addresses which contain the locations of the function parameter values. The info regarding this structure can be found here: https://learn.microsoft.com/en-us/dotnet/framework/unmanaged-api/profiling/cor-prf-function-argument-info-structure

I've also parsed the function's metadata to determine the number of parameters supplied to the function and each parameter's type. I used the GetMethodProps function of the IMetaDataImport interface.

I'm stuck on what to do next and how would I would proceed to get the actual value of each parameter using the COR_PRF_FUNCTION_ARGUMENT_INFO structure? Do I need to determine the size of each parameter to calculate an offset from a memory address for each parameter? Thanks for any help

You should be able to work out the size of each argument and how to interpret it based on the type of the argument:

• If its a primitive value type, then the size and representation should be fairly self-evident. (int => '4 byte integer', double => '8 byte floating point', bool => '4 byte integer where 0 is false and everything else is true', IntPtr => 'pointer-sized integer')
• If its a reference type, then it will be a pointer-sized ObjectID. (warning: ObjectIDs are subject to changing between callbacks, so don't try to hang onto them unless you also hook the GC callbacks and update them when the objects move).
• If its a value type, then you should be able to use GetClassLayout to get the size of the value and the location of the fields within it.
• If its passed by reference, then it will be a (pointer-sized) pointer to the memory location where the actual value is stored (or will be stored in the case of out arguments).