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According to https://devdocs.prestashop.com/1.7/modules/concepts/hooks/list-of-hooks/ 

there is a hook called action<AdminControllerName>ListingFieldsModifier

I would like to use this hook, but in order to do so, I need to debug, to find out what the parameters are, etc.

So then I go into /classes/controller/AdminController.php to public function getList() in line 3153

There, the following code does nothing:

    public function getList(
        $id_lang,
        $order_by = null,
        $order_way = null,
        $start = 0,
        $limit = null,
        $id_lang_shop = false
    ) {
		//// THIS IS THE CODE I'VE INSERTED///
		dump($this->controller_name);
		die();
		//// END OF MY OWN CODE///

        Hook::exec('action' . $this->controller_name . 'ListingFieldsModifier', array(
            'select' => &$this->_select,
            'join' => &$this->_join,
            'where' => &$this->_where,
            'group_by' => &$this->_group,
            'order_by' => &$this->_orderBy,
            'order_way' => &$this->_orderWay,
            'fields' => &$this->fields_list,
        ));

The page is loading as if nothing ever happened.

How can I debug anything in this function, when die() and dump() don't do anything?