[LLVMdev] Problem of use CallGraph

[Jianfei Hu]

Hello,
       I want to  traverse CallGraph

code segment:

	
		virtual void getAnalysisUsage(AnalysisUsage &AU) const
		{
			AU.addRequired<CallGraph>();
		}

		virtual bool runOnModule(Module &F)
		{
			CallGraph &g = getAnalysis<CallGraph>();
			for ( CallGraph::iterator i = g.begin(); i != g.end(); i++)
			{
				errs()<<"-----------------\n";
				errs()<<i->second->getFunction()->getName()<<"\n";
			}
			return false;
		}

Compile:
g++ -fPIC -shared `llvm-config --cxxflags` -o MPIAnalysis.so MPIAnalysis.cpp,

when I use following command to run:
opt -load ./MPIAnalysis.so  -hello < main
it shows the error:

-----------------
0  opt 0x085cddc8
Stack dump:
0.	Program arguments: opt -load ./MPIAnalysis.so -hello
1.	Running pass 'Hello World Pass' on module '<stdin>'.
Segmentation Error

I found similar Problem in
http://lists.cs.uiuc.edu/pipermail/llvmdev/2010-July/033133.html
But all function are defined in single binary IR file 'main', none of
them are external.

Why could not print the name of CallGraphNode's function name?