1 | /* Iterator routines for manipulating GENERIC tree statement list. |
2 | Copyright (C) 2003-2017 Free Software Foundation, Inc. |
3 | Contributed by Andrew MacLeod <amacleod@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 | struct tree_stmt_iterator { |
33 | struct tree_statement_list_node *ptr; |
34 | tree container; |
35 | }; |
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 | extern tree expr_first (tree); |
121 | extern tree expr_last (tree); |
122 | |
123 | #endif /* GCC_TREE_ITERATOR_H */ |
124 | |