code: def add(self, call_descriptor):
          
          h = call_descriptor.hash
          self.calls.append(h)
          if h in self.__skip:
              self.__skip[h] -= 1
              if self.__skip[h] == 0:
                  del self.__skip[h]
          else:
              hook = self.hooks.get(h, False)
              if hook:
                  hook.callback(call_descriptor)
docs: Adds a CallDescriptor hash to the stack. If there is a hook associated with this call it will be executed and passed an instance of the call descriptor.
  
          :param caliendo.call_descriptor.CallDescriptor call_descriptor: The call descriptor to add to the stack.