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1 /* GNU Objective C Runtime 'fast enumeration' implementation
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2 Copyright (C) 2010-2017 Free Software Foundation, Inc.
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3 Contributed by Nicola Pero <nicola.pero@meta-innovation.com>
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4
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5 This file is part of GCC.
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6
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7 GCC is free software; you can redistribute it and/or modify it under the
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8 terms of the GNU General Public License as published by the Free Software
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9 Foundation; either version 3, or (at your option) any later version.
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10
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11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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12 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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13 FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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14 details.
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15
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16 Under Section 7 of GPL version 3, you are granted additional
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17 permissions described in the GCC Runtime Library Exception, version
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18 3.1, as published by the Free Software Foundation.
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19
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20 You should have received a copy of the GNU General Public License and
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21 a copy of the GCC Runtime Library Exception along with this program;
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22 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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23 <http://www.gnu.org/licenses/>. */
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24
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25 /* This file implements objc_enumeration_mutation() and
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26 objc_set_enumeration_mutation_handler(), the two functions required
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27 to handle mutations during a fast enumeration. */
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28 #include "objc-private/common.h"
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29 #include "objc-private/error.h" /* For _objc_abort() */
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30 #include "objc/runtime.h" /* For objc_enumerationMutation() and objc_set_enumeration_mutation_handler() */
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31
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32 /* The enumeration mutation handler currently in use. */
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33 static void (*__objc_enumeration_mutation_handler)(id) = NULL;
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34
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35 void
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36 objc_setEnumerationMutationHandler (void (*handler)(id))
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37 {
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38 __objc_enumeration_mutation_handler = handler;
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39 }
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40
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41 void
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42 objc_enumerationMutation (id collection)
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43 {
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44 if (__objc_enumeration_mutation_handler != NULL)
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45 (*__objc_enumeration_mutation_handler) (collection);
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46
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47 /* We always abort if we get here; there is no point in going on as
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48 the next iteration in the fast enumeration would probably go
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49 deeply wrong. */
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50 _objc_abort ("Collection %p mutated during fast enumeration", collection);
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51 }
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