llvm get called function name using llvm instruction

Question

I want to know if an llvm::intruction is a function call and if so what is the name of the fucntion it is calling to.

Also is there a way to get llvm::CallInst from an llvm::Instruction?

Answer 1

Instruction* I = ...
if (isa<CallInst>(I)) {
  StringRef name = cast<CallInst>(I).getCalledFunction().getName();
  ...
}

For more information on this, see the relevant section in LLVM Programmer's Manual. In general, I wholeheartedly recommend this guide for beginners.