1 /* Iterator routines for manipulating GENERIC tree statement list. 2 Copyright (C) 2003-2013 Free Software Foundation, Inc. 3 Contributed by Andrew MacLeod <amacleod (at) redhat.com> 4 5 This file is part of GCC. 6 7 GCC is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 3, or (at your option) 10 any later version. 11 12 GCC is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with GCC; see the file COPYING3. If not see 19 <http://www.gnu.org/licenses/>. */ 20 21 22 /* This file is dependent upon the implementation of tree's. It provides an 23 abstract interface to the tree objects such that if all tree creation and 24 manipulations are done through this interface, we can easily change the 25 implementation of tree's, and not impact other code. */ 26 27 #ifndef GCC_TREE_ITERATOR_H 28 #define GCC_TREE_ITERATOR_H 1 29 30 /* Iterator object for GENERIC or GIMPLE TREE statements. */ 31 32 typedef struct { 33 struct tree_statement_list_node *ptr; 34 tree container; 35 } tree_stmt_iterator; 36 37 static inline tree_stmt_iterator 38 tsi_start (tree t) 39 { 40 tree_stmt_iterator i; 41 42 i.ptr = STATEMENT_LIST_HEAD (t); 43 i.container = t; 44 45 return i; 46 } 47 48 static inline tree_stmt_iterator 49 tsi_last (tree t) 50 { 51 tree_stmt_iterator i; 52 53 i.ptr = STATEMENT_LIST_TAIL (t); 54 i.container = t; 55 56 return i; 57 } 58 59 static inline bool 60 tsi_end_p (tree_stmt_iterator i) 61 { 62 return i.ptr == NULL; 63 } 64 65 static inline bool 66 tsi_one_before_end_p (tree_stmt_iterator i) 67 { 68 return i.ptr != NULL && i.ptr->next == NULL; 69 } 70 71 static inline void 72 tsi_next (tree_stmt_iterator *i) 73 { 74 i->ptr = i->ptr->next; 75 } 76 77 static inline void 78 tsi_prev (tree_stmt_iterator *i) 79 { 80 i->ptr = i->ptr->prev; 81 } 82 83 static inline tree * 84 tsi_stmt_ptr (tree_stmt_iterator i) 85 { 86 return &i.ptr->stmt; 87 } 88 89 static inline tree 90 tsi_stmt (tree_stmt_iterator i) 91 { 92 return i.ptr->stmt; 93 } 94 95 enum tsi_iterator_update 96 { 97 TSI_NEW_STMT, /* Only valid when single statement is added, move 98 iterator to it. */ 99 TSI_SAME_STMT, /* Leave the iterator at the same statement. */ 100 TSI_CHAIN_START, /* Only valid when chain of statements is added, move 101 iterator to the first statement in the chain. */ 102 TSI_CHAIN_END, /* Only valid when chain of statements is added, move 103 iterator to the last statement in the chain. */ 104 TSI_CONTINUE_LINKING /* Move iterator to whatever position is suitable for 105 linking other statements/chains of statements in 106 the same direction. */ 107 }; 108 109 extern void tsi_link_before (tree_stmt_iterator *, tree, 110 enum tsi_iterator_update); 111 extern void tsi_link_after (tree_stmt_iterator *, tree, 112 enum tsi_iterator_update); 113 114 extern void tsi_delink (tree_stmt_iterator *); 115 116 extern tree alloc_stmt_list (void); 117 extern void free_stmt_list (tree); 118 extern void append_to_statement_list (tree, tree *); 119 extern void append_to_statement_list_force (tree, tree *); 120 121 #endif /* GCC_TREE_ITERATOR_H */ 122
