code: def _pre_analysis(self):
          
  
          # Fill up self._starts
          for item in self._starts:
              callstack = None
              if isinstance(item, tuple):
                  # (addr, jumpkind)
                  ip = item[0]
                  state = self._create_initial_state(item[0], item[1])
  
              elif isinstance(item, SimState):
                  # SimState
                  state = item.copy()  # pylint: disable=no-member
                  ip = state.solver.eval_one(state.ip)
                  self._reset_state_mode(state, 'fastpath')
  
              else:
                  raise AngrCFGError('Unsupported CFG start type: %s.' % str(type(item)))
  
              self._symbolic_function_initial_state[ip] = state
              path_wrapper = CFGJob(ip, state, self._context_sensitivity_level, None, None, call_stack=callstack)
              key = path_wrapper.block_id
              if key not in self._start_keys:
                  self._start_keys.append(key)
  
              self._insert_job(path_wrapper)
              self._register_analysis_job(path_wrapper.func_addr, path_wrapper)
docs: Initialization work. Executed prior to the analysis.
  
          :return: None