X-Git-Url: http://git.sourceforge.jp/view?a=blobdiff_plain;f=libobjc%2Fnil_method.c;h=15e3d528c497e7bfb65d09a788762937018ef45c;hb=75809ab8697b3e250df0f62d75cbd21e5be81dc2;hp=800b0e3bf53f2befde459e5b894253ac37357a92;hpb=617763557711795ccc8087e4c7af30832f1af171;p=pf3gnuchains%2Fgcc-fork.git

diff --git a/libobjc/nil_method.c b/libobjc/nil_method.c
index 800b0e3bf53..15e3d528c49 100644
--- a/libobjc/nil_method.c
+++ b/libobjc/nil_method.c
@@ -1,36 +1,56 @@
 /* GNU Objective C Runtime nil receiver function
-   Copyright (C) 1993, 1995, 1996, 2002 Free Software Foundation, Inc.
+   Copyright (C) 1993, 1995, 1996, 2002, 2009, 2010
+   Free Software Foundation, Inc.
    Contributed by Kresten Krab Thorup
 
-This file is part of GNU CC.
+This file is part of GCC.
 
-GNU CC is free software; you can redistribute it and/or modify it under the
+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 2, or (at your option) any later version.
+Foundation; either version 3, or (at your option) any later version.
 
-GNU CC is distributed in the hope that it will be useful, but WITHOUT ANY
+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.
 
-You should have received a copy of the GNU General Public License along with
-GNU CC; see the file COPYING.  If not, write to the Free Software
-Foundation, 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA.  */
+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/>.  */
 
-/* As a special exception, if you link this library with files compiled with
-   GCC to produce an executable, this does not cause the resulting executable
-   to be covered by the GNU General Public License. This exception does not
-   however invalidate any other reasons why the executable file might be
-   covered by the GNU General Public License.  */
 
 /* This is the nil method, the function that is called when the receiver
    of a method is nil */
 
-#include "runtime.h"
+#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__)), ...)
+nil_method (id receiver, SEL op __attribute__ ((__unused__)))
 {
   return receiver;
 }