def interp_head_addr(self):
        """Returns PtrTo(PtrTo(PyInterpreterState)) value"""
        if self._interp_head_addr is not None:
            return self._interp_head_addr
        try:
            interp_head_addr = self.get_interp_head_addr_through_symbol()
        except SymbolNotFound:
            logger.debug("Could not find interp_head symbol")
            # Hard way
            interp_head_addr = self.get_interp_head_addr_through_PyInterpreterState_Head()
        self._interp_head_addr = interp_head_addr
        return interp_head_addr