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/* GNU Objective C Runtime 'fast enumeration' implementation
Copyright (C) 2010-2021 Free Software Foundation, Inc.
Contributed by Nicola Pero <>
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
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
<>. */
/* This file implements objc_enumeration_mutation() and
objc_set_enumeration_mutation_handler(), the two functions required
to handle mutations during a fast enumeration. */
#include "objc-private/common.h"
#include "objc-private/error.h" /* For _objc_abort() */
#include "objc/runtime.h" /* For objc_enumerationMutation() and objc_set_enumeration_mutation_handler() */
/* The enumeration mutation handler currently in use. */
static void (*__objc_enumeration_mutation_handler)(id) = NULL;
objc_setEnumerationMutationHandler (void (*handler)(id))
__objc_enumeration_mutation_handler = handler;
objc_enumerationMutation (id collection)
if (__objc_enumeration_mutation_handler != NULL)
(*__objc_enumeration_mutation_handler) (collection);
/* We always abort if we get here; there is no point in going on as
the next iteration in the fast enumeration would probably go
deeply wrong. */
_objc_abort ("Collection %p mutated during fast enumeration", collection);