opreport wirdness

[Winson Y. <win...@gm...>]

Here is another question about the opreport result:

Let's say I have a shared library called libAAA.so, and here is the result
generated from opreport.
As you can see, opreport did pickup the symbols from inside of libAAA.so,
but why the one on the second line is showing as anonymous symbol from
libAAA.so
Is it saying libAAA.so is calling some other library code that it doesn't
know about? Will it be possible to find out which api inside libAAA.so is
making the outside library call?

  9         0.2851  libAAA.so           Flow::IsDying() const
  7         0.2217  libAAA.so           anonymous symbol from section .plt
  7         0.2217  libAAA.so           PtrId::PtrId()

/Winson.