How to create a call to a function which returns a struct

Project Infrastructure LLVM Dev List Archives
#1

Hello,

I am trying to create a call to a function which returns a struct in llvm pass. I also want to read struct fields returned from this function call. Can somebody help me with this?

Regards,
Sangeeta

#2

You call the function like every other function. You can then extract the fields with the 'extractvalue' instruction (http://llvm.org/docs/LangRef.html#extractvalue-instruction). In a pass, usually these instructions are created with a IRBuilder. If you don't already know about it, you'll find many examples in the LLVM code base (for example under lib/Transforms/).