llvm dev - Jul 2017 - CallGraphNode giving incorrect function Name

Hi,
I am trying to traverse the call graph. Once I get a node in the call
graph, I am trying to print the function name corresponding to that call
graph node as well as the number of references.

Results:
1)The function name is always an empty string.
2)The number of references is always a random number.
3)Also the called functions names are also an empty string.


Code:
bool runOnModule(llvm::Module &M) override
{


        CallGraph cg = CallGraph(M);
        cg.dump();// this is correct. It is printing the expected the call
graph

        for ( CallGraph::const_iterator itr = cg.begin(), ie = cg.end() ;
itr != ie; itr++)
        {
           if (itr->second != nullptr)
           {
                itr->second->dump();
                errs()<<"-----------CGN---------\n";
                CallGraphNode *cgn = itr->second.get();



                if(const Function* fptr = cgn->getFunction())
                {
                    errs()<<"Number of references
are"<<cgn->getNumReferences()<<"\n";

                    errs()<<fptr->getName()<<"\n";


                    if(cgn->operator[](0) != nullptr)
                    {

                        if(cgn->operator[](0)->getFunction() != nullptr)
                        {

errs()<<cgn->operator[](0)->getFunction()->getName()<<"\n";
                        }

                     }
                  }
             }
       }
}



Thanks and regards
-Ketan Patil
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