EntityForm::prepareInvokeAll

protected EntityForm::prepareInvokeAll($hook, FormStateInterface $form_state)

protected function prepareInvokeAll($hook, FormStateInterface $form_state) {
  $implementations = $this->moduleHandler->getImplementations($hook);
  foreach ($implementations as $module) {
    $function = $module . '_' . $hook;
    if (function_exists($function)) {
      // Ensure we pass an updated translation object and form display at
      // each invocation, since they depend on form state which is alterable.
      $args = array($this->entity, $this->operation, &$form_state);
      call_user_func_array($function, $args);
    }
  }
}