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88e17b57 | 1 | /* GNU Objective C Runtime nil receiver function |
40165636 | 2 | Copyright (C) 1993, 1995, 1996, 2002 Free Software Foundation, Inc. |
88e17b57 BE |
3 | Contributed by Kresten Krab Thorup |
4 | ||
5 | This file is part of GNU CC. | |
6 | ||
7 | GNU CC is free software; you can redistribute it and/or modify it under the | |
8 | terms of the GNU General Public License as published by the Free Software | |
9 | Foundation; either version 2, or (at your option) any later version. | |
10 | ||
11 | GNU CC is distributed in the hope that it will be useful, but WITHOUT ANY | |
12 | WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS | |
13 | FOR A PARTICULAR PURPOSE. See the GNU General Public License for more | |
14 | details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License along with | |
17 | GNU CC; see the file COPYING. If not, write to the Free Software | |
18 | Foundation, 59 Temple Place - Suite 330, | |
19 | Boston, MA 02111-1307, USA. */ | |
20 | ||
21 | /* As a special exception, if you link this library with files compiled with | |
22 | GCC to produce an executable, this does not cause the resulting executable | |
23 | to be covered by the GNU General Public License. This exception does not | |
24 | however invalidate any other reasons why the executable file might be | |
25 | covered by the GNU General Public License. */ | |
26 | ||
27 | /* This is the nil method, the function that is called when the receiver | |
28 | of a method is nil */ | |
29 | ||
30 | #include "runtime.h" | |
31 | ||
d90ad6d3 NP |
32 | /* When the receiver of a method invocation is nil, the runtime |
33 | returns nil_method() as the method implementation. This function | |
34 | will be casted to whatever function was supposed to be executed to | |
35 | execute that method (that function will take an id, followed by a | |
36 | SEL, followed by who knows what arguments, depends on the method), | |
37 | and executed. | |
38 | ||
39 | For this reason, nil_method() should be a function which can be | |
40 | called in place of any function taking an 'id' argument followed by | |
41 | a 'SEL' argument, followed by zero, or one, or any number of | |
42 | arguments (both a fixed number, or a variable number !). | |
43 | ||
44 | There is no "proper" implementation of such a nil_method function | |
45 | in C, however in all existing implementations it does not matter | |
46 | when extra arguments are present, so we can simply create a function | |
47 | taking a receiver and a selector, and all other arguments will be | |
48 | ignored. :-) | |
49 | */ | |
50 | ||
88e17b57 | 51 | id |
edf4d41e | 52 | nil_method (id receiver, SEL op __attribute__ ((__unused__))) |
88e17b57 BE |
53 | { |
54 | return receiver; | |
55 | } |