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https://github.com/darlinghq/darling-libobjc2.git
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f8b98a73a2
- nil_method now returns 0, not receiver. - Metaclasses actually get their dtables installed with the new ABI. For some reason this wasn't being done, so class messages didn't work with the new ABI. Now they do and (at least some) nontrivial programs work. - Undid commenting out of the code setting the fast ivar access pointers. I can't remember why this was commented out, but it seems not to break anything. I have an LLVM pass that makes compiled code access these pointers, but it's not committed yet.
55 lines
2.2 KiB
C
55 lines
2.2 KiB
C
/* GNU Objective C Runtime nil receiver function
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Copyright (C) 1993, 1995, 1996, 2002, 2009 Free Software Foundation, Inc.
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Contributed by Kresten Krab Thorup
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This file is part of GCC.
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GCC 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 3, or (at your option) any later version.
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GCC 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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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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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 "objc/runtime-legacy.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 0;
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}
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