module T::Private::Methods::CallValidation

def self.create_validator_method_fast(mod, original_method, method_sig)
  if method_sig.return_type.is_a?(T::Private::Types::Void)
    raise "Should have used create_validator_procedure_fast"
  end
  # trampoline to reduce stack frame size
  if method_sig.arg_types.length == 0
    create_validator_method_fast0(mod, original_method, method_sig, method_sig.return_type.raw_type)
  elsif method_sig.arg_types.length == 1
    create_validator_method_fast1(mod, original_method, method_sig, method_sig.return_type.raw_type,
                                  method_sig.arg_types[0][1].raw_type)
  elsif method_sig.arg_types.length == 2
    create_validator_method_fast2(mod, original_method, method_sig, method_sig.return_type.raw_type,
                                  method_sig.arg_types[0][1].raw_type,
                                  method_sig.arg_types[1][1].raw_type)
  elsif method_sig.arg_types.length == 3
    create_validator_method_fast3(mod, original_method, method_sig, method_sig.return_type.raw_type,
                                  method_sig.arg_types[0][1].raw_type,
                                  method_sig.arg_types[1][1].raw_type,
                                  method_sig.arg_types[2][1].raw_type)
  elsif method_sig.arg_types.length == 4
    create_validator_method_fast4(mod, original_method, method_sig, method_sig.return_type.raw_type,
                                  method_sig.arg_types[0][1].raw_type,
                                  method_sig.arg_types[1][1].raw_type,
                                  method_sig.arg_types[2][1].raw_type,
                                  method_sig.arg_types[3][1].raw_type)
  else
    raise "should not happen"
  end
end