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1 /* Generic single linked list to keep various information
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2 Copyright (C) 1993-2018 Free Software Foundation, Inc.
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3 Contributed by Kresten Krab Thorup.
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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
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8 it under the terms of the GNU General Public License as published by
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9 the Free Software Foundation; either version 3, or (at your option)
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10 any later version.
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11
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12 GCC is distributed in the hope that it will be useful,
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13 but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 GNU General Public License for more details.
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16
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17 Under Section 7 of GPL version 3, you are granted additional
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18 permissions described in the GCC Runtime Library Exception, version
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19 3.1, as published by the Free Software Foundation.
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20
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21 You should have received a copy of the GNU General Public License and
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22 a copy of the GCC Runtime Library Exception along with this program;
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23 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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24 <http://www.gnu.org/licenses/>. */
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25
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26 #ifndef __GNU_OBJC_LIST_H
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27 #define __GNU_OBJC_LIST_H
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28
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29 struct objc_list
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30 {
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31 void *head;
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32 struct objc_list *tail;
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33 };
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34
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35 /* Return a cons cell produced from (head . tail). */
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36 static inline struct objc_list*
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37 list_cons (void* head, struct objc_list* tail)
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38 {
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39 struct objc_list* cell;
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40
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41 cell = (struct objc_list*)objc_malloc (sizeof (struct objc_list));
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42 cell->head = head;
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43 cell->tail = tail;
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44 return cell;
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45 }
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46
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47 /* Remove the element at the head by replacing it by its
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48 successor. */
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49 static inline void
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50 list_remove_head (struct objc_list** list)
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51 {
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52 if ((*list)->tail)
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53 {
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54 /* Fetch next. */
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55 struct objc_list* tail = (*list)->tail;
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56
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57 /* Copy next to list head. */
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58 *(*list) = *tail;
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59
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60 /* Free next. */
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61 objc_free (tail);
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62 }
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63 else
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64 {
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65 /* Inly one element in list. */
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66 objc_free (*list);
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67 (*list) = 0;
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68 }
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69 }
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70
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71
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72 /* Map FUNCTION over all elements in LIST. */
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73 static inline void
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74 list_mapcar (struct objc_list* list, void(*function)(void*))
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75 {
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76 while (list)
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77 {
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78 (*function) (list->head);
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79 list = list->tail;
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80 }
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81 }
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82
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83 /* Free list (backwards recursive). */
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84 static inline void
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85 list_free (struct objc_list* list)
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86 {
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87 if(list)
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88 {
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89 list_free (list->tail);
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90 objc_free (list);
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91 }
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92 }
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93
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94 #endif /* not __GNU_OBJC_LIST_H */
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