code: def instantiate_labels(instructions):
      
      label_i = 1
      result = []
      label_mapping = dict()
      for instr in instructions:
          if isinstance(instr, Jump) and isinstance(instr.target, LabelPlaceholder):
              new_target, label_mapping, label_i = _get_label(instr.target, label_mapping, label_i)
              result.append(Jump(new_target))
          elif isinstance(instr, JumpConditional) and isinstance(instr.target, LabelPlaceholder):
              new_target, label_mapping, label_i = _get_label(instr.target, label_mapping, label_i)
              cls = instr.__class__  # Make the correct subclass
              result.append(cls(new_target, instr.condition))
          elif isinstance(instr, JumpTarget) and isinstance(instr.label, LabelPlaceholder):
              new_label, label_mapping, label_i = _get_label(instr.label, label_mapping, label_i)
              result.append(JumpTarget(new_label))
          else:
              result.append(instr)
  
      return result
docs: Takes an iterable of instructions which may contain label placeholders and assigns
      them all defined values.
  
      :return: list of instructions with all label placeholders assigned to real labels.