| /* GNU Objective C Runtime nil receiver function |
| Copyright (C) 1993-2020 Free Software Foundation, Inc. |
| Contributed by Kresten Krab Thorup |
| |
| This file is part of GCC. |
| |
| GCC is free software; you can redistribute it and/or modify it under the |
| terms of the GNU General Public License as published by the Free Software |
| Foundation; either version 3, or (at your option) any later version. |
| |
| GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
| WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS |
| FOR A PARTICULAR PURPOSE. See the GNU General Public License for more |
| details. |
| |
| Under Section 7 of GPL version 3, you are granted additional |
| permissions described in the GCC Runtime Library Exception, version |
| 3.1, as published by the Free Software Foundation. |
| |
| You should have received a copy of the GNU General Public License and |
| a copy of the GCC Runtime Library Exception along with this program; |
| see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| |
| /* This is the nil method, the function that is called when the receiver |
| of a method is nil */ |
| |
| #include "objc-private/common.h" |
| #include "objc/objc.h" |
| |
| /* When the receiver of a method invocation is nil, the runtime |
| returns nil_method() as the method implementation. This function |
| will be casted to whatever function was supposed to be executed to |
| execute that method (that function will take an id, followed by a |
| SEL, followed by who knows what arguments, depends on the method), |
| and executed. |
| |
| For this reason, nil_method() should be a function which can be |
| called in place of any function taking an 'id' argument followed by |
| a 'SEL' argument, followed by zero, or one, or any number of |
| arguments (both a fixed number, or a variable number !). |
| |
| There is no "proper" implementation of such a nil_method function |
| in C, however in all existing implementations it does not matter |
| when extra arguments are present, so we can simply create a function |
| taking a receiver and a selector, and all other arguments will be |
| ignored. :-) |
| */ |
| |
| id |
| nil_method (id receiver, SEL op __attribute__ ((__unused__))) |
| { |
| return receiver; |
| } |