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5be5c238 | 1 | /* Header file for gimple iterators. |
5624e564 | 2 | Copyright (C) 2013-2015 Free Software Foundation, Inc. |
5be5c238 AM |
3 | |
4 | This file is part of GCC. | |
5 | ||
6 | GCC is free software; you can redistribute it and/or modify it under | |
7 | the terms of the GNU General Public License as published by the Free | |
8 | Software Foundation; either version 3, or (at your option) any later | |
9 | version. | |
10 | ||
11 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
12 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
14 | for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GCC; see the file COPYING3. If not see | |
18 | <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #ifndef GCC_GIMPLE_ITERATOR_H | |
21 | #define GCC_GIMPLE_ITERATOR_H | |
22 | ||
23 | /* Iterator object for GIMPLE statement sequences. */ | |
24 | ||
84562394 | 25 | struct gimple_stmt_iterator |
5be5c238 AM |
26 | { |
27 | /* Sequence node holding the current statement. */ | |
28 | gimple_seq_node ptr; | |
29 | ||
30 | /* Sequence and basic block holding the statement. These fields | |
31 | are necessary to handle edge cases such as when statement is | |
32 | added to an empty basic block or when the last statement of a | |
33 | block/sequence is removed. */ | |
34 | gimple_seq *seq; | |
35 | basic_block bb; | |
84562394 | 36 | }; |
538dd0b7 DM |
37 | |
38 | /* Iterator over GIMPLE_PHI statements. */ | |
39 | struct gphi_iterator : public gimple_stmt_iterator | |
40 | { | |
41 | gphi *phi () const | |
42 | { | |
43 | return as_a <gphi *> (ptr); | |
44 | } | |
45 | }; | |
5be5c238 | 46 | |
18f429e2 AM |
47 | enum gsi_iterator_update |
48 | { | |
49 | GSI_NEW_STMT, /* Only valid when single statement is added, move | |
50 | iterator to it. */ | |
51 | GSI_SAME_STMT, /* Leave the iterator at the same statement. */ | |
52 | GSI_CONTINUE_LINKING /* Move iterator to whatever position is suitable | |
53 | for linking other statements in the same | |
54 | direction. */ | |
55 | }; | |
56 | ||
5be5c238 AM |
57 | extern void gsi_insert_seq_before_without_update (gimple_stmt_iterator *, |
58 | gimple_seq, | |
59 | enum gsi_iterator_update); | |
60 | extern void gsi_insert_seq_before (gimple_stmt_iterator *, gimple_seq, | |
61 | enum gsi_iterator_update); | |
62 | extern void gsi_insert_seq_after_without_update (gimple_stmt_iterator *, | |
63 | gimple_seq, | |
64 | enum gsi_iterator_update); | |
65 | extern void gsi_insert_seq_after (gimple_stmt_iterator *, gimple_seq, | |
66 | enum gsi_iterator_update); | |
67 | extern gimple_seq gsi_split_seq_after (gimple_stmt_iterator); | |
68 | extern void gsi_set_stmt (gimple_stmt_iterator *, gimple); | |
69 | extern void gsi_split_seq_before (gimple_stmt_iterator *, gimple_seq *); | |
8cb65b37 | 70 | extern bool gsi_replace (gimple_stmt_iterator *, gimple, bool); |
5be5c238 AM |
71 | extern void gsi_replace_with_seq (gimple_stmt_iterator *, gimple_seq, bool); |
72 | extern void gsi_insert_before_without_update (gimple_stmt_iterator *, gimple, | |
73 | enum gsi_iterator_update); | |
74 | extern void gsi_insert_before (gimple_stmt_iterator *, gimple, | |
75 | enum gsi_iterator_update); | |
76 | extern void gsi_insert_after_without_update (gimple_stmt_iterator *, gimple, | |
77 | enum gsi_iterator_update); | |
78 | extern void gsi_insert_after (gimple_stmt_iterator *, gimple, | |
79 | enum gsi_iterator_update); | |
80 | extern bool gsi_remove (gimple_stmt_iterator *, bool); | |
81 | extern gimple_stmt_iterator gsi_for_stmt (gimple); | |
538dd0b7 | 82 | extern gphi_iterator gsi_for_phi (gphi *); |
5be5c238 AM |
83 | extern void gsi_move_after (gimple_stmt_iterator *, gimple_stmt_iterator *); |
84 | extern void gsi_move_before (gimple_stmt_iterator *, gimple_stmt_iterator *); | |
85 | extern void gsi_move_to_bb_end (gimple_stmt_iterator *, basic_block); | |
86 | extern void gsi_insert_on_edge (edge, gimple); | |
87 | extern void gsi_insert_seq_on_edge (edge, gimple_seq); | |
88 | extern basic_block gsi_insert_on_edge_immediate (edge, gimple); | |
89 | extern basic_block gsi_insert_seq_on_edge_immediate (edge, gimple_seq); | |
90 | extern void gsi_commit_edge_inserts (void); | |
91 | extern void gsi_commit_one_edge_insert (edge, basic_block *); | |
538dd0b7 | 92 | extern gphi_iterator gsi_start_phis (basic_block); |
f8e89441 | 93 | extern void update_modified_stmts (gimple_seq); |
5be5c238 AM |
94 | |
95 | /* Return a new iterator pointing to GIMPLE_SEQ's first statement. */ | |
96 | ||
97 | static inline gimple_stmt_iterator | |
98 | gsi_start_1 (gimple_seq *seq) | |
99 | { | |
100 | gimple_stmt_iterator i; | |
101 | ||
102 | i.ptr = gimple_seq_first (*seq); | |
103 | i.seq = seq; | |
104 | i.bb = i.ptr ? gimple_bb (i.ptr) : NULL; | |
105 | ||
106 | return i; | |
107 | } | |
108 | ||
109 | #define gsi_start(x) gsi_start_1 (&(x)) | |
110 | ||
111 | static inline gimple_stmt_iterator | |
112 | gsi_none (void) | |
113 | { | |
114 | gimple_stmt_iterator i; | |
115 | i.ptr = NULL; | |
116 | i.seq = NULL; | |
117 | i.bb = NULL; | |
118 | return i; | |
119 | } | |
120 | ||
121 | /* Return a new iterator pointing to the first statement in basic block BB. */ | |
122 | ||
123 | static inline gimple_stmt_iterator | |
124 | gsi_start_bb (basic_block bb) | |
125 | { | |
126 | gimple_stmt_iterator i; | |
127 | gimple_seq *seq; | |
128 | ||
129 | seq = bb_seq_addr (bb); | |
130 | i.ptr = gimple_seq_first (*seq); | |
131 | i.seq = seq; | |
132 | i.bb = bb; | |
133 | ||
134 | return i; | |
135 | } | |
136 | ||
104cb50b MJ |
137 | gimple_stmt_iterator gsi_start_edge (edge e); |
138 | ||
5be5c238 AM |
139 | /* Return a new iterator initially pointing to GIMPLE_SEQ's last statement. */ |
140 | ||
141 | static inline gimple_stmt_iterator | |
142 | gsi_last_1 (gimple_seq *seq) | |
143 | { | |
144 | gimple_stmt_iterator i; | |
145 | ||
146 | i.ptr = gimple_seq_last (*seq); | |
147 | i.seq = seq; | |
148 | i.bb = i.ptr ? gimple_bb (i.ptr) : NULL; | |
149 | ||
150 | return i; | |
151 | } | |
152 | ||
153 | #define gsi_last(x) gsi_last_1 (&(x)) | |
154 | ||
155 | /* Return a new iterator pointing to the last statement in basic block BB. */ | |
156 | ||
157 | static inline gimple_stmt_iterator | |
158 | gsi_last_bb (basic_block bb) | |
159 | { | |
160 | gimple_stmt_iterator i; | |
161 | gimple_seq *seq; | |
162 | ||
163 | seq = bb_seq_addr (bb); | |
164 | i.ptr = gimple_seq_last (*seq); | |
165 | i.seq = seq; | |
166 | i.bb = bb; | |
167 | ||
168 | return i; | |
169 | } | |
170 | ||
171 | /* Return true if I is at the end of its sequence. */ | |
172 | ||
173 | static inline bool | |
174 | gsi_end_p (gimple_stmt_iterator i) | |
175 | { | |
176 | return i.ptr == NULL; | |
177 | } | |
178 | ||
179 | /* Return true if I is one statement before the end of its sequence. */ | |
180 | ||
181 | static inline bool | |
182 | gsi_one_before_end_p (gimple_stmt_iterator i) | |
183 | { | |
daa6e488 | 184 | return i.ptr != NULL && i.ptr->next == NULL; |
5be5c238 AM |
185 | } |
186 | ||
187 | /* Advance the iterator to the next gimple statement. */ | |
188 | ||
189 | static inline void | |
190 | gsi_next (gimple_stmt_iterator *i) | |
191 | { | |
daa6e488 | 192 | i->ptr = i->ptr->next; |
5be5c238 AM |
193 | } |
194 | ||
195 | /* Advance the iterator to the previous gimple statement. */ | |
196 | ||
197 | static inline void | |
198 | gsi_prev (gimple_stmt_iterator *i) | |
199 | { | |
daa6e488 DM |
200 | gimple prev = i->ptr->prev; |
201 | if (prev->next) | |
5be5c238 AM |
202 | i->ptr = prev; |
203 | else | |
204 | i->ptr = NULL; | |
205 | } | |
206 | ||
207 | /* Return the current stmt. */ | |
208 | ||
209 | static inline gimple | |
210 | gsi_stmt (gimple_stmt_iterator i) | |
211 | { | |
212 | return i.ptr; | |
213 | } | |
214 | ||
42c0b54d ML |
215 | /* Return a new iterator pointing to the first non-debug statement |
216 | in basic block BB. */ | |
217 | ||
218 | static inline gimple_stmt_iterator | |
219 | gsi_start_bb_nondebug (basic_block bb) | |
220 | { | |
221 | gimple_stmt_iterator gsi = gsi_start_bb (bb); | |
222 | while (!gsi_end_p (gsi) && is_gimple_debug (gsi_stmt (gsi))) | |
223 | gsi_next (&gsi); | |
224 | ||
225 | return gsi; | |
226 | } | |
227 | ||
5be5c238 AM |
228 | /* Return a block statement iterator that points to the first non-label |
229 | statement in block BB. */ | |
230 | ||
231 | static inline gimple_stmt_iterator | |
232 | gsi_after_labels (basic_block bb) | |
233 | { | |
234 | gimple_stmt_iterator gsi = gsi_start_bb (bb); | |
235 | ||
236 | while (!gsi_end_p (gsi) && gimple_code (gsi_stmt (gsi)) == GIMPLE_LABEL) | |
237 | gsi_next (&gsi); | |
238 | ||
239 | return gsi; | |
240 | } | |
241 | ||
242 | /* Advance the iterator to the next non-debug gimple statement. */ | |
243 | ||
244 | static inline void | |
245 | gsi_next_nondebug (gimple_stmt_iterator *i) | |
246 | { | |
247 | do | |
248 | { | |
249 | gsi_next (i); | |
250 | } | |
251 | while (!gsi_end_p (*i) && is_gimple_debug (gsi_stmt (*i))); | |
252 | } | |
253 | ||
7d1ff6f0 | 254 | /* Advance the iterator to the previous non-debug gimple statement. */ |
5be5c238 AM |
255 | |
256 | static inline void | |
257 | gsi_prev_nondebug (gimple_stmt_iterator *i) | |
258 | { | |
259 | do | |
260 | { | |
261 | gsi_prev (i); | |
262 | } | |
263 | while (!gsi_end_p (*i) && is_gimple_debug (gsi_stmt (*i))); | |
264 | } | |
265 | ||
266 | /* Return a new iterator pointing to the first non-debug statement in | |
267 | basic block BB. */ | |
268 | ||
269 | static inline gimple_stmt_iterator | |
270 | gsi_start_nondebug_bb (basic_block bb) | |
271 | { | |
272 | gimple_stmt_iterator i = gsi_start_bb (bb); | |
273 | ||
274 | if (!gsi_end_p (i) && is_gimple_debug (gsi_stmt (i))) | |
275 | gsi_next_nondebug (&i); | |
276 | ||
277 | return i; | |
278 | } | |
279 | ||
280 | /* Return a new iterator pointing to the first non-debug non-label statement in | |
281 | basic block BB. */ | |
282 | ||
283 | static inline gimple_stmt_iterator | |
284 | gsi_start_nondebug_after_labels_bb (basic_block bb) | |
285 | { | |
286 | gimple_stmt_iterator i = gsi_after_labels (bb); | |
287 | ||
288 | if (!gsi_end_p (i) && is_gimple_debug (gsi_stmt (i))) | |
289 | gsi_next_nondebug (&i); | |
290 | ||
291 | return i; | |
292 | } | |
293 | ||
294 | /* Return a new iterator pointing to the last non-debug statement in | |
295 | basic block BB. */ | |
296 | ||
297 | static inline gimple_stmt_iterator | |
298 | gsi_last_nondebug_bb (basic_block bb) | |
299 | { | |
300 | gimple_stmt_iterator i = gsi_last_bb (bb); | |
301 | ||
302 | if (!gsi_end_p (i) && is_gimple_debug (gsi_stmt (i))) | |
303 | gsi_prev_nondebug (&i); | |
304 | ||
305 | return i; | |
306 | } | |
307 | ||
fd29c024 ML |
308 | /* Iterates I statement iterator to the next non-virtual statement. */ |
309 | ||
310 | static inline void | |
538dd0b7 | 311 | gsi_next_nonvirtual_phi (gphi_iterator *i) |
fd29c024 | 312 | { |
538dd0b7 | 313 | gphi *phi; |
fd29c024 ML |
314 | |
315 | if (gsi_end_p (*i)) | |
316 | return; | |
317 | ||
538dd0b7 | 318 | phi = i->phi (); |
fd29c024 ML |
319 | gcc_assert (phi != NULL); |
320 | ||
321 | while (virtual_operand_p (gimple_phi_result (phi))) | |
322 | { | |
323 | gsi_next (i); | |
324 | ||
325 | if (gsi_end_p (*i)) | |
326 | return; | |
327 | ||
538dd0b7 | 328 | phi = i->phi (); |
fd29c024 ML |
329 | } |
330 | } | |
331 | ||
5be5c238 AM |
332 | /* Return the basic block associated with this iterator. */ |
333 | ||
334 | static inline basic_block | |
335 | gsi_bb (gimple_stmt_iterator i) | |
336 | { | |
337 | return i.bb; | |
338 | } | |
339 | ||
340 | /* Return the sequence associated with this iterator. */ | |
341 | ||
342 | static inline gimple_seq | |
343 | gsi_seq (gimple_stmt_iterator i) | |
344 | { | |
345 | return *i.seq; | |
346 | } | |
347 | ||
1b7f61eb TV |
348 | /* Determine whether SEQ is a nondebug singleton. */ |
349 | ||
350 | static inline bool | |
351 | gimple_seq_nondebug_singleton_p (gimple_seq seq) | |
352 | { | |
353 | gimple_stmt_iterator gsi; | |
e92e61a7 TV |
354 | |
355 | /* Find a nondebug gimple. */ | |
1b7f61eb TV |
356 | gsi.ptr = gimple_seq_first (seq); |
357 | gsi.seq = &seq; | |
358 | gsi.bb = NULL; | |
1b7f61eb TV |
359 | while (!gsi_end_p (gsi) |
360 | && is_gimple_debug (gsi_stmt (gsi))) | |
361 | gsi_next (&gsi); | |
362 | ||
e92e61a7 TV |
363 | /* No nondebug gimple found, not a singleton. */ |
364 | if (gsi_end_p (gsi)) | |
1b7f61eb TV |
365 | return false; |
366 | ||
e92e61a7 TV |
367 | /* Find a next nondebug gimple. */ |
368 | gsi_next (&gsi); | |
1b7f61eb TV |
369 | while (!gsi_end_p (gsi) |
370 | && is_gimple_debug (gsi_stmt (gsi))) | |
371 | gsi_next (&gsi); | |
372 | ||
e92e61a7 TV |
373 | /* Only a singleton if there's no next nondebug gimple. */ |
374 | return gsi_end_p (gsi); | |
1b7f61eb TV |
375 | } |
376 | ||
5be5c238 | 377 | #endif /* GCC_GIMPLE_ITERATOR_H */ |