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Editorial Team
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Asked: 2026-06-04T07:33:18+00:00

I get the following error when executing my program: E:Unable to load libsim.so: libsim.so:

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I get the following error when executing my program:

E:Unable to load libsim.so: libsim.so: undefined symbol: _ZTV15IteratorRegFile

in sim.cpp there is s.th. like

//IteratorRegFileIs is a wrapper that calls the constructor for IteratorRegFile
Fwk::Ptr<IteratorRegFile> iteratorRegFile_ = IteratorRegFile::IteratorRegFileIs( "RF" );
void init(){
  SparseArrayInt64 *sparse_array = new SparseArrayInt64(segID);
}

in SparseArrayInt64.cpp:

extern Fwk::Ptr<IteratorRegFile> iteratorRegFile_;

IteratorRegFile.h:

public:
  static IteratorRegFile::ValidPtr IteratorRegFileIs(Tac::Name _name) {
    IteratorRegFile * m = new IteratorRegFile(_name);
    m->referencesDec(1);
    return m;
  }
protected:
   IteratorRegFile( const IteratorRegFile& );
   explicit IteratorRegFile(Tac::Name _name): Tac::Entity(_name),
     index_(0) {
    handleInit();
   }

Any idea why the compiler is mangling the function so the lib doesn’t find it anymore?

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1 Answer

  1. Editorial Team

    If you do this on Linux with gcc:

    According to c++filt _ZTV15IteratorRegFile is vtable for IteratorRegFile. So the mangled name refers to vtvable, not your function.

    I did some search and found this advice "You must implement virtual methods of your class because that's when the compiler actually generates the vtable for it."

    You can check what symbols there are in a module in this way:
    nm your-module-name

    I guess this links might help:

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