llvm dev - Oct 2018 - How to properly initialize a callgraph pointer?

Hi all,


I want to initialize a callgraph pointer on demand, so I do something like the
following:
class CallSite {
    CallSite(llvm::Module &M) {
        llvmCG = new llvm::CallGraph(*m); // this line causes core dump
	this->m = &M;
   }
    ~CallSite() {
           ...
    }
public:
    ....
private:
    llvm::CallGraph *llvmCG;
   ...
}

I use out of source to build the code, and it could compile without errors. But
when throws "core dump" when running
with 'opt -load callsite/libLLVMPassCS.so -callsite < hello.bc >
/dev/null'.


Command Line output:
opt -load callsite/libLLVMPassCS.so -callsite < hello.bc > /dev/null
#0 0x208425e llvm::sys::PrintStackTrace(_IO_FILE*)
/home/zhangysh1995/packages/llvm36/lib/Support/Unix/Signals.inc:422:15
#1 0x2084feb PrintStackTraceSignalHandler(void*)
/home/zhangysh1995/packages/llvm36/lib/Support/Unix/Signals.inc:481:1
#2 0x20852d9 SignalHandler(int)
/home/zhangysh1995/packages/llvm36/lib/Support/Unix/Signals.inc:198:60
#3 0x7f7488070390 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x11390)
#4 0x78da73 llvm::iplist<llvm::Function,
llvm::ilist_traits<llvm::Function> >::CreateLazySentinel() const
/home/zhangysh1995/packages/llvm36/include/llvm/ADT/ilist.h:327:22
#5 0x78da39 llvm::iplist<llvm::Function,
llvm::ilist_traits<llvm::Function> >::begin()
/home/zhangysh1995/packages/llvm36/include/llvm/ADT/ilist.h:360:5
#6 0x78d539 llvm::Module::begin()
/home/zhangysh1995/packages/llvm36/include/llvm/IR/Module.h:571:50
#7 0x1b649d9 llvm::CallGraph::CallGraph(llvm::Module&)
/home/zhangysh1995/packages/llvm36/lib/Analysis/IPA/CallGraph.cpp:27:29  // this
is the constructor
#8 0x7f7486dc40b2 CallSite::CallSite(llvm::Module&)
(callsite/libLLVMPassCS.so+0x30b2)
#9 0x7f7486dc45d3 (anonymous namespace)::test::runOnModule(llvm::Module&)
(callsite/libLLVMPassCS.so+0x35d3)
#10 0x1fd5df5 (anonymous
namespace)::MPPassManager::runOnModule(llvm::Module&)
/home/zhangysh1995/packages/llvm36/lib/IR/LegacyPassManager.cpp:1616:23
#11 0x1fd5a09 llvm::legacy::PassManagerImpl::run(llvm::Module&)
/home/zhangysh1995/packages/llvm36/lib/IR/LegacyPassManager.cpp:1723:16
#12 0x1fd6371 llvm::legacy::PassManager::run(llvm::Module&)
/home/zhangysh1995/packages/llvm36/lib/IR/LegacyPassManager.cpp:1756:3
#13 0x7cde9c main /home/zhangysh1995/packages/llvm36/tools/opt/opt.cpp:582:3
#14 0x7f7486fe7830 __libc_start_main
/build/glibc-Cl5G7W/glibc-2.23/csu/../csu/libc-start.c:325:0
#15 0x78cb99 _start (/usr/local/bin/opt+0x78cb99)
Stack dump:
0.	Program arguments: opt -load callsite/libLLVMPassCS.so -callsite 
1.	Running pass 'Get call information' on module
'<stdin>'.
Segmentation fault (core dumped)

Could anyone help me with this issue? And if I change it to instance instead of
pointer,
error: use of deleted function ‘llvm::CallGraph&
llvm::CallGraph::operator=(const llvm::CallGraph&)’
  llvmCG = llvm::CallGraph(*m);
BTW, is there anyway to test my pass runtime behavior without running opt
everytime?




Thank you all,
Yushan
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