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1 /* Iterator routines for manipulating GENERIC and GIMPLE tree statements.
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2 Copyright (C) 2003, 2004, 2007 Free Software Foundation, Inc.
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3 Contributed by Andrew MacLeod <amacleod@redhat.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
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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 You should have received a copy of the GNU General Public License
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18 along with GCC; see the file COPYING3. If not see
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19 <http://www.gnu.org/licenses/>. */
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20
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21
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22 /* This file is dependent upon the implementation of tree's. It provides an
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23 abstract interface to the tree objects such that if all tree creation and
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24 manipulations are done through this interface, we can easily change the
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25 implementation of tree's, and not impact other code. */
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26
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27 #ifndef GCC_TREE_ITERATOR_H
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28 #define GCC_TREE_ITERATOR_H 1
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29
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30 /* Iterator object for GENERIC or GIMPLE TREE statements. */
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31
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32 typedef struct {
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33 struct tree_statement_list_node *ptr;
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34 tree container;
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35 } tree_stmt_iterator;
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36
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37 static inline tree_stmt_iterator
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38 tsi_start (tree t)
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39 {
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40 tree_stmt_iterator i;
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41
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42 i.ptr = STATEMENT_LIST_HEAD (t);
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43 i.container = t;
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44
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45 return i;
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46 }
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47
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48 static inline tree_stmt_iterator
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49 tsi_last (tree t)
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50 {
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51 tree_stmt_iterator i;
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52
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53 i.ptr = STATEMENT_LIST_TAIL (t);
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54 i.container = t;
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55
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56 return i;
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57 }
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58
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59 static inline bool
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60 tsi_end_p (tree_stmt_iterator i)
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61 {
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62 return i.ptr == NULL;
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63 }
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64
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65 static inline bool
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66 tsi_one_before_end_p (tree_stmt_iterator i)
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67 {
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68 return i.ptr != NULL && i.ptr->next == NULL;
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69 }
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70
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71 static inline void
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72 tsi_next (tree_stmt_iterator *i)
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73 {
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74 i->ptr = i->ptr->next;
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75 }
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76
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77 static inline void
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78 tsi_prev (tree_stmt_iterator *i)
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79 {
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80 i->ptr = i->ptr->prev;
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81 }
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82
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83 static inline tree *
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84 tsi_stmt_ptr (tree_stmt_iterator i)
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85 {
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86 return &i.ptr->stmt;
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87 }
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88
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89 static inline tree
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90 tsi_stmt (tree_stmt_iterator i)
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91 {
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92 return i.ptr->stmt;
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93 }
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94
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95 enum tsi_iterator_update
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96 {
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97 TSI_NEW_STMT, /* Only valid when single statement is added, move
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98 iterator to it. */
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99 TSI_SAME_STMT, /* Leave the iterator at the same statement. */
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100 TSI_CHAIN_START, /* Only valid when chain of statements is added, move
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101 iterator to the first statement in the chain. */
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102 TSI_CHAIN_END, /* Only valid when chain of statements is added, move
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103 iterator to the last statement in the chain. */
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104 TSI_CONTINUE_LINKING /* Move iterator to whatever position is suitable for
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105 linking other statements/chains of statements in
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106 the same direction. */
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107 };
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108
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109 extern void tsi_link_before (tree_stmt_iterator *, tree,
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110 enum tsi_iterator_update);
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111 extern void tsi_link_after (tree_stmt_iterator *, tree,
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112 enum tsi_iterator_update);
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113
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114 void tsi_delink (tree_stmt_iterator *);
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115
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116 tree tsi_split_statement_list_after (const tree_stmt_iterator *);
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117 tree tsi_split_statement_list_before (tree_stmt_iterator *);
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118
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119 void append_to_statement_list (tree, tree *);
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120 void append_to_statement_list_force (tree, tree *);
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121
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122 #endif /* GCC_TREE_ITERATOR_H */
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