Does PostgreSQL provide anything to dump fcinfo?

I'm looking to get into writing extension in C. I want to better understand what this argument is and how they get changed in different invocations. Is there anything that can dump this argument out or a method to debug the fcinfo argument? In [this question](https://dba.stackexchange.com/q/302049/2639) , I learned that it's actually a pointer to a FunctionCallInfoBaseData struct, but is there an easy way to dump that on function invocation?