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dcf1a1ec | 1 | /* Header file for gimple iterators. |
fbd26352 | 2 | Copyright (C) 2013-2019 Free Software Foundation, Inc. |
dcf1a1ec | 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 | ||
b3e7c666 | 25 | struct gimple_stmt_iterator |
dcf1a1ec | 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; | |
b3e7c666 | 36 | }; |
1a91d914 | 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 | }; | |
dcf1a1ec | 46 | |
e795d6e1 | 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 | ||
dcf1a1ec | 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); | |
42acab1c | 68 | extern void gsi_set_stmt (gimple_stmt_iterator *, gimple *); |
dcf1a1ec | 69 | extern void gsi_split_seq_before (gimple_stmt_iterator *, gimple_seq *); |
42acab1c | 70 | extern bool gsi_replace (gimple_stmt_iterator *, gimple *, bool); |
dcf1a1ec | 71 | extern void gsi_replace_with_seq (gimple_stmt_iterator *, gimple_seq, bool); |
42acab1c | 72 | extern void gsi_insert_before_without_update (gimple_stmt_iterator *, gimple *, |
dcf1a1ec | 73 | enum gsi_iterator_update); |
42acab1c | 74 | extern void gsi_insert_before (gimple_stmt_iterator *, gimple *, |
dcf1a1ec | 75 | enum gsi_iterator_update); |
42acab1c | 76 | extern void gsi_insert_after_without_update (gimple_stmt_iterator *, gimple *, |
dcf1a1ec | 77 | enum gsi_iterator_update); |
42acab1c | 78 | extern void gsi_insert_after (gimple_stmt_iterator *, gimple *, |
dcf1a1ec | 79 | enum gsi_iterator_update); |
80 | extern bool gsi_remove (gimple_stmt_iterator *, bool); | |
42acab1c | 81 | extern gimple_stmt_iterator gsi_for_stmt (gimple *); |
d5b5c2c5 | 82 | extern gimple_stmt_iterator gsi_for_stmt (gimple *, gimple_seq *); |
1a91d914 | 83 | extern gphi_iterator gsi_for_phi (gphi *); |
dcf1a1ec | 84 | extern void gsi_move_after (gimple_stmt_iterator *, gimple_stmt_iterator *); |
85 | extern void gsi_move_before (gimple_stmt_iterator *, gimple_stmt_iterator *); | |
86 | extern void gsi_move_to_bb_end (gimple_stmt_iterator *, basic_block); | |
42acab1c | 87 | extern void gsi_insert_on_edge (edge, gimple *); |
dcf1a1ec | 88 | extern void gsi_insert_seq_on_edge (edge, gimple_seq); |
42acab1c | 89 | extern basic_block gsi_insert_on_edge_immediate (edge, gimple *); |
dcf1a1ec | 90 | extern basic_block gsi_insert_seq_on_edge_immediate (edge, gimple_seq); |
91 | extern void gsi_commit_edge_inserts (void); | |
92 | extern void gsi_commit_one_edge_insert (edge, basic_block *); | |
1a91d914 | 93 | extern gphi_iterator gsi_start_phis (basic_block); |
82fc0e0a | 94 | extern void update_modified_stmts (gimple_seq); |
dcf1a1ec | 95 | |
96 | /* Return a new iterator pointing to GIMPLE_SEQ's first statement. */ | |
97 | ||
98 | static inline gimple_stmt_iterator | |
99 | gsi_start_1 (gimple_seq *seq) | |
100 | { | |
101 | gimple_stmt_iterator i; | |
102 | ||
103 | i.ptr = gimple_seq_first (*seq); | |
104 | i.seq = seq; | |
105 | i.bb = i.ptr ? gimple_bb (i.ptr) : NULL; | |
106 | ||
107 | return i; | |
108 | } | |
109 | ||
110 | #define gsi_start(x) gsi_start_1 (&(x)) | |
111 | ||
112 | static inline gimple_stmt_iterator | |
113 | gsi_none (void) | |
114 | { | |
115 | gimple_stmt_iterator i; | |
116 | i.ptr = NULL; | |
117 | i.seq = NULL; | |
118 | i.bb = NULL; | |
119 | return i; | |
120 | } | |
121 | ||
122 | /* Return a new iterator pointing to the first statement in basic block BB. */ | |
123 | ||
124 | static inline gimple_stmt_iterator | |
125 | gsi_start_bb (basic_block bb) | |
126 | { | |
127 | gimple_stmt_iterator i; | |
128 | gimple_seq *seq; | |
129 | ||
130 | seq = bb_seq_addr (bb); | |
131 | i.ptr = gimple_seq_first (*seq); | |
132 | i.seq = seq; | |
133 | i.bb = bb; | |
134 | ||
135 | return i; | |
136 | } | |
137 | ||
1605ba4b | 138 | gimple_stmt_iterator gsi_start_edge (edge e); |
139 | ||
dcf1a1ec | 140 | /* Return a new iterator initially pointing to GIMPLE_SEQ's last statement. */ |
141 | ||
142 | static inline gimple_stmt_iterator | |
143 | gsi_last_1 (gimple_seq *seq) | |
144 | { | |
145 | gimple_stmt_iterator i; | |
146 | ||
147 | i.ptr = gimple_seq_last (*seq); | |
148 | i.seq = seq; | |
149 | i.bb = i.ptr ? gimple_bb (i.ptr) : NULL; | |
150 | ||
151 | return i; | |
152 | } | |
153 | ||
154 | #define gsi_last(x) gsi_last_1 (&(x)) | |
155 | ||
156 | /* Return a new iterator pointing to the last statement in basic block BB. */ | |
157 | ||
158 | static inline gimple_stmt_iterator | |
159 | gsi_last_bb (basic_block bb) | |
160 | { | |
161 | gimple_stmt_iterator i; | |
162 | gimple_seq *seq; | |
163 | ||
164 | seq = bb_seq_addr (bb); | |
165 | i.ptr = gimple_seq_last (*seq); | |
166 | i.seq = seq; | |
167 | i.bb = bb; | |
168 | ||
169 | return i; | |
170 | } | |
171 | ||
172 | /* Return true if I is at the end of its sequence. */ | |
173 | ||
174 | static inline bool | |
175 | gsi_end_p (gimple_stmt_iterator i) | |
176 | { | |
177 | return i.ptr == NULL; | |
178 | } | |
179 | ||
180 | /* Return true if I is one statement before the end of its sequence. */ | |
181 | ||
182 | static inline bool | |
183 | gsi_one_before_end_p (gimple_stmt_iterator i) | |
184 | { | |
de6bd75e | 185 | return i.ptr != NULL && i.ptr->next == NULL; |
dcf1a1ec | 186 | } |
187 | ||
188 | /* Advance the iterator to the next gimple statement. */ | |
189 | ||
190 | static inline void | |
191 | gsi_next (gimple_stmt_iterator *i) | |
192 | { | |
de6bd75e | 193 | i->ptr = i->ptr->next; |
dcf1a1ec | 194 | } |
195 | ||
196 | /* Advance the iterator to the previous gimple statement. */ | |
197 | ||
198 | static inline void | |
199 | gsi_prev (gimple_stmt_iterator *i) | |
200 | { | |
42acab1c | 201 | gimple *prev = i->ptr->prev; |
de6bd75e | 202 | if (prev->next) |
dcf1a1ec | 203 | i->ptr = prev; |
204 | else | |
205 | i->ptr = NULL; | |
206 | } | |
207 | ||
208 | /* Return the current stmt. */ | |
209 | ||
42acab1c | 210 | static inline gimple * |
dcf1a1ec | 211 | gsi_stmt (gimple_stmt_iterator i) |
212 | { | |
213 | return i.ptr; | |
214 | } | |
215 | ||
bce107d7 | 216 | /* Return a block statement iterator that points to the first |
d71c7316 | 217 | non-label statement in block BB. */ |
dcf1a1ec | 218 | |
219 | static inline gimple_stmt_iterator | |
220 | gsi_after_labels (basic_block bb) | |
221 | { | |
222 | gimple_stmt_iterator gsi = gsi_start_bb (bb); | |
223 | ||
d71c7316 | 224 | for (; !gsi_end_p (gsi); ) |
bce107d7 | 225 | { |
d71c7316 | 226 | if (gimple_code (gsi_stmt (gsi)) == GIMPLE_LABEL) |
227 | gsi_next (&gsi); | |
bce107d7 | 228 | else |
229 | break; | |
230 | } | |
dcf1a1ec | 231 | |
232 | return gsi; | |
233 | } | |
234 | ||
235 | /* Advance the iterator to the next non-debug gimple statement. */ | |
236 | ||
237 | static inline void | |
238 | gsi_next_nondebug (gimple_stmt_iterator *i) | |
239 | { | |
240 | do | |
241 | { | |
242 | gsi_next (i); | |
243 | } | |
244 | while (!gsi_end_p (*i) && is_gimple_debug (gsi_stmt (*i))); | |
245 | } | |
246 | ||
df84cd8e | 247 | /* Advance the iterator to the previous non-debug gimple statement. */ |
dcf1a1ec | 248 | |
249 | static inline void | |
250 | gsi_prev_nondebug (gimple_stmt_iterator *i) | |
251 | { | |
252 | do | |
253 | { | |
254 | gsi_prev (i); | |
255 | } | |
256 | while (!gsi_end_p (*i) && is_gimple_debug (gsi_stmt (*i))); | |
257 | } | |
258 | ||
bce107d7 | 259 | /* Return a new iterator pointing to the first non-debug statement in |
260 | SEQ. */ | |
261 | ||
262 | static inline gimple_stmt_iterator | |
263 | gsi_start_nondebug (gimple_seq seq) | |
264 | { | |
265 | gimple_stmt_iterator gsi = gsi_start (seq); | |
266 | if (!gsi_end_p (gsi) && is_gimple_debug (gsi_stmt (gsi))) | |
267 | gsi_next_nondebug (&gsi); | |
268 | ||
269 | return gsi; | |
270 | } | |
271 | ||
dcf1a1ec | 272 | /* Return a new iterator pointing to the first non-debug statement in |
273 | basic block BB. */ | |
274 | ||
275 | static inline gimple_stmt_iterator | |
276 | gsi_start_nondebug_bb (basic_block bb) | |
277 | { | |
278 | gimple_stmt_iterator i = gsi_start_bb (bb); | |
279 | ||
280 | if (!gsi_end_p (i) && is_gimple_debug (gsi_stmt (i))) | |
281 | gsi_next_nondebug (&i); | |
282 | ||
283 | return i; | |
284 | } | |
285 | ||
286 | /* Return a new iterator pointing to the first non-debug non-label statement in | |
287 | basic block BB. */ | |
288 | ||
289 | static inline gimple_stmt_iterator | |
290 | gsi_start_nondebug_after_labels_bb (basic_block bb) | |
291 | { | |
292 | gimple_stmt_iterator i = gsi_after_labels (bb); | |
293 | ||
294 | if (!gsi_end_p (i) && is_gimple_debug (gsi_stmt (i))) | |
295 | gsi_next_nondebug (&i); | |
296 | ||
297 | return i; | |
298 | } | |
299 | ||
300 | /* Return a new iterator pointing to the last non-debug statement in | |
301 | basic block BB. */ | |
302 | ||
303 | static inline gimple_stmt_iterator | |
304 | gsi_last_nondebug_bb (basic_block bb) | |
305 | { | |
306 | gimple_stmt_iterator i = gsi_last_bb (bb); | |
307 | ||
308 | if (!gsi_end_p (i) && is_gimple_debug (gsi_stmt (i))) | |
309 | gsi_prev_nondebug (&i); | |
310 | ||
311 | return i; | |
312 | } | |
313 | ||
3aad3afc | 314 | /* Return true if I is followed only by debug statements in its |
315 | sequence. */ | |
316 | ||
317 | static inline bool | |
318 | gsi_one_nondebug_before_end_p (gimple_stmt_iterator i) | |
319 | { | |
320 | if (gsi_one_before_end_p (i)) | |
321 | return true; | |
322 | if (gsi_end_p (i)) | |
323 | return false; | |
324 | gsi_next_nondebug (&i); | |
325 | return gsi_end_p (i); | |
326 | } | |
327 | ||
09809ecc | 328 | /* Iterates I statement iterator to the next non-virtual statement. */ |
329 | ||
330 | static inline void | |
1a91d914 | 331 | gsi_next_nonvirtual_phi (gphi_iterator *i) |
09809ecc | 332 | { |
1a91d914 | 333 | gphi *phi; |
09809ecc | 334 | |
335 | if (gsi_end_p (*i)) | |
336 | return; | |
337 | ||
1a91d914 | 338 | phi = i->phi (); |
09809ecc | 339 | gcc_assert (phi != NULL); |
340 | ||
341 | while (virtual_operand_p (gimple_phi_result (phi))) | |
342 | { | |
343 | gsi_next (i); | |
344 | ||
345 | if (gsi_end_p (*i)) | |
346 | return; | |
347 | ||
1a91d914 | 348 | phi = i->phi (); |
09809ecc | 349 | } |
350 | } | |
351 | ||
dcf1a1ec | 352 | /* Return the basic block associated with this iterator. */ |
353 | ||
354 | static inline basic_block | |
355 | gsi_bb (gimple_stmt_iterator i) | |
356 | { | |
357 | return i.bb; | |
358 | } | |
359 | ||
360 | /* Return the sequence associated with this iterator. */ | |
361 | ||
362 | static inline gimple_seq | |
363 | gsi_seq (gimple_stmt_iterator i) | |
364 | { | |
365 | return *i.seq; | |
366 | } | |
367 | ||
2ce3b2a5 | 368 | /* Determine whether SEQ is a nondebug singleton. */ |
369 | ||
370 | static inline bool | |
371 | gimple_seq_nondebug_singleton_p (gimple_seq seq) | |
372 | { | |
373 | gimple_stmt_iterator gsi; | |
71bbf1a5 | 374 | |
375 | /* Find a nondebug gimple. */ | |
2ce3b2a5 | 376 | gsi.ptr = gimple_seq_first (seq); |
377 | gsi.seq = &seq; | |
378 | gsi.bb = NULL; | |
2ce3b2a5 | 379 | while (!gsi_end_p (gsi) |
380 | && is_gimple_debug (gsi_stmt (gsi))) | |
381 | gsi_next (&gsi); | |
382 | ||
71bbf1a5 | 383 | /* No nondebug gimple found, not a singleton. */ |
384 | if (gsi_end_p (gsi)) | |
2ce3b2a5 | 385 | return false; |
386 | ||
71bbf1a5 | 387 | /* Find a next nondebug gimple. */ |
388 | gsi_next (&gsi); | |
2ce3b2a5 | 389 | while (!gsi_end_p (gsi) |
390 | && is_gimple_debug (gsi_stmt (gsi))) | |
391 | gsi_next (&gsi); | |
392 | ||
71bbf1a5 | 393 | /* Only a singleton if there's no next nondebug gimple. */ |
394 | return gsi_end_p (gsi); | |
2ce3b2a5 | 395 | } |
396 | ||
dcf1a1ec | 397 | #endif /* GCC_GIMPLE_ITERATOR_H */ |