new_contents: """This module contains the detection code for insecure delegate call usage."""
  
  import logging
  from typing import List
  
  from mythril.analysis.swc_data import DOS_WITH_BLOCK_GAS_LIMIT
  from mythril.analysis.report import Issue
  from mythril.analysis.modules.base import DetectionModule
  from mythril.laser.ethereum.state.global_state import GlobalState
  from mythril.laser.ethereum.state.annotation import StateAnnotation
  from mythril.laser.ethereum import util
  
  log = logging.getLogger(__name__)
  
  
  class LoopAnnotation(StateAnnotation):
      def __init__(self, jump_address: int) -> None:
          self.jump_address = jump_address
  
  
  class DOS(DetectionModule):
      """This module detects denial of service by exhausting gas."""
  
      def __init__(self) -> None:
          """"""
          super().__init__(
              name="DOS",
              swc_id=DOS_WITH_BLOCK_GAS_LIMIT,
              description="Check for DOS",
              entrypoint="callback",
              pre_hooks=["JUMPI", "CALL", "SSTORE"],
          )
  
          self._jumpdest_count = {}
  
      def execute(self, state: GlobalState) -> None:
          """
  
          :param state:
          :return:
          """
          log.debug("Executing module: DOS")
  
          self._issues.extend(self._analyze_states(state))
  
      def _analyze_states(self, state: GlobalState) -> List[Issue]:
          """
          :param state: the current state
          :return: returns the issues for that corresponding state
          """
  
          opcode = state.get_current_instruction()["opcode"]
  
          if opcode == "JUMPI":
  
              target = util.get_concrete_int(state.mstate.stack[-1])
  
              try:
                  transaction = state.current_transaction
                  self._jumpdest_count[transaction]
  
                  try:
                      if self._jumpdest_count[transaction][target] > 3:
                          state.annotate(
                              LoopAnnotation(state.get_current_instruction()["address"])
                          )
                      else:
                          self._jumpdest_count[transaction][target] += 1
                  except KeyError:
                      self._jumpdest_count[transaction][target] = 0
  
              except KeyError:
                  self._jumpdest_count[transaction] = {}
                  self._jumpdest_count[transaction][target] = 0
  
          else:
  
              for annotation in state.annotations:
  
                  if type(annotation) == LoopAnnotation:
  
                      operation = (
                          "A storage modification"
                          if opcode == "CALL"
                          else "An external call"
                      )
  
                      description_head = (
                          "Potential Denial-of-Service if block gas limit is reached."
                      )
                      description_tail = operation + " is executed in a loop."
  
                      issue = Issue(
                          contract=state.environment.active_account.contract_name,
                          function_name=state.environment.active_function_name,
                          address=annotation.jump_address,
                          swc_id=DOS_WITH_BLOCK_GAS_LIMIT,
                          bytecode=state.environment.code.bytecode,
                          title="Potential Denial-of-Service if block gas limit is reached",
                          severity="Low",
                          description_head=description_head,
                          description_tail=description_tail,
                          gas_used=(state.mstate.min_gas_used, state.mstate.max_gas_used),
                      )
                      return [issue]
  
          return []
  
  
  detector = DOS()
  
subject: Add DOS detection module