A Function object is a constructor from LLVM pass

Question

I am writing a llvm pass. I have a Function object from llvm and I want to know if this one is a constructor of a class or not. How can I do it? Any suggestion?

Answer 1

Well... Looks like the only thing you could do is to try to demangle the function name and try to deduce whether it's constructor or not. Though, it's not 100% precise since one would need to handle multiple mangling schemes.

Answer 2

As Anton said, we can demangle the function name.

LLVM has a demangler in llvm/Demangle/Demangle.h. The usage can be seen in

how to get function base name from managled function name using llvm ItaniumDemangle api

  ItaniumPartialDemangler Demangler; 
  Demangler.partialDemangle(F.getName().str().c_str());
  if (Demangler.isCtorOrDtor()){
    outs() << MF.getName() << " is constructor !\n";
  }

This may not be an elegant way to determine whether a function is a constructor or not as it may cause performance issues in compilation. I am still waiting for a better approach.