How to add a Metadata String to an LLVM module with the C++ API?

Question

I\'m trying to add a metadata string to my LLVM module. The stripped down version of what I\'m trying is

#include 
#include 

        

Answer 1

Try this:

#include <llvm/LLVMContext.h>
#include <llvm/Module.h>
#include <llvm/Metadata.h>

using namespace llvm;

int main() {
  Module* module = new Module("test", getGlobalContext());

  Value *Elts[] = {
    MDString::get(module->getContext(), "test1")
  };
  MDNode *Node = MDNode::get(getGlobalContext(), Elts);

  NamedMDNode *NMD = module->getOrInsertNamedMetadata("test2");
  NMD->addOperand(Node);

  module->dump();
}

I am not sure if you are able to have metadata "floating around" as you say. If it's not attached to any part of your program then what good is it doing? I've been looking into MD a bit lately... I found similar code in lib/Analysis/DIBuilder.cpp. Good luck.