[LLVMdev] Problem of use CallGraph

[Jianfei Hu]

Well, I read http://lists.cs.uiuc.edu/pipermail/llvmdev/2010-July/033133.html
again and consult the information about "external node" in CallGraph.
http://llvm.org/docs/doxygen/html/CallGraph_8h_source.html
CallGraph would build an external nodes, and it linked to all funtions
in module. But the node itself does not stand for any function.
i->second->getFunction() would return NULL.
I should read previous message more carefully.
Sorry for the my spam.  :-(

2012/8/17 Hongbin Zheng <etherzhhb at gmail.com>:
> On Fri, Aug 17, 2012 at 4:23 PM, Jianfei Hu <hujianfei258 at gmail.com> wrote:
>> 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";
> You may try something like this:
>                                    if (CallGraphNode *CGN = i->second)
>                                       ... CGN->getFunction()->getName() ...
>>                                 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?
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