[LLVMdev] Segmentation fault when traverse call graph

[lucefe]

Dear everyone,

I want to traverse call graph, but I have some trouble .

In my pass MyPass which need to traverse call graph, I firstly added the
CallGraph analysis to the pass requirements by

*AU.addRequired<CallGraph>();*

My pass MyPass then will be added to a pass manager by

*manager.add(new MyPass());*

and then I want to traverse the call graph such as:

CallGraph CG = this->getAnalysis<CallGraph>;
for (CallGraph::const_iterator i = CG.begin(); i != CG.end(); ++i) {
....
}

However, I encountered a segmentation fault with the next core dump
information. What should I do?

llvm::PassInfo::createPass() const + 4
llvm::PMTopLevelManager::schedulePass(llvm::Pass*)
llvm::PassManager::add(llvm::Pass*)
...
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