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56 lines
2.3 KiB
C
56 lines
2.3 KiB
C
/* GNU Objective C Runtime nil receiver function
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Copyright (C) 1993, 1995, 1996, 2002 Free Software Foundation, Inc.
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Contributed by Kresten Krab Thorup
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This file is part of GNU CC.
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GNU CC is free software; you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation; either version 2, or (at your option) any later version.
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GNU CC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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details.
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You should have received a copy of the GNU General Public License along with
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GNU CC; see the file COPYING. If not, write to the Free Software
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Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* As a special exception, if you link this library with files compiled with
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GCC to produce an executable, this does not cause the resulting executable
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to be covered by the GNU General Public License. This exception does not
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however invalidate any other reasons why the executable file might be
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covered by the GNU General Public License. */
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/* This is the nil method, the function that is called when the receiver
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of a method is nil */
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#include "runtime.h"
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/* When the receiver of a method invocation is nil, the runtime
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returns nil_method() as the method implementation. This function
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will be casted to whatever function was supposed to be executed to
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execute that method (that function will take an id, followed by a
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SEL, followed by who knows what arguments, depends on the method),
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and executed.
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For this reason, nil_method() should be a function which can be
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called in place of any function taking an 'id' argument followed by
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a 'SEL' argument, followed by zero, or one, or any number of
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arguments (both a fixed number, or a variable number !).
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There is no "proper" implementation of such a nil_method function
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in C, however in all existing implementations it does not matter
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when extra arguments are present, so we can simply create a function
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taking a receiver and a selector, and all other arguments will be
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ignored. :-)
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*/
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id
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nil_method (id receiver, SEL op __attribute__ ((__unused__)))
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{
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return receiver;
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}
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