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Commit | Line | Data |
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08df6c0d AO |
1 | /* Infrastructure for tracking user variable locations and values |
2 | throughout compilation. | |
5624e564 | 3 | Copyright (C) 2010-2015 Free Software Foundation, Inc. |
08df6c0d AO |
4 | Contributed by Alexandre Oliva <aoliva@redhat.com>. |
5 | ||
6 | This file is part of GCC. | |
7 | ||
8 | GCC is free software; you can redistribute it and/or modify it under | |
9 | the terms of the GNU General Public License as published by the Free | |
10 | Software Foundation; either version 3, or (at your option) any later | |
11 | version. | |
12 | ||
13 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
14 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
15 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
16 | for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with GCC; see the file COPYING3. If not see | |
20 | <http://www.gnu.org/licenses/>. */ | |
21 | ||
22 | #include "config.h" | |
23 | #include "system.h" | |
24 | #include "coretypes.h" | |
25 | #include "tm.h" | |
26 | #include "rtl.h" | |
60393bbc AM |
27 | #include "predict.h" |
28 | #include "basic-block.h" | |
08df6c0d | 29 | #include "valtrack.h" |
83685514 | 30 | #include "hard-reg-set.h" |
08df6c0d AO |
31 | #include "function.h" |
32 | #include "regs.h" | |
33 | #include "emit-rtl.h" | |
34 | ||
e90c56c6 JJ |
35 | /* gen_lowpart_no_emit hook implementation for DEBUG_INSNs. In DEBUG_INSNs, |
36 | all lowpart SUBREGs are valid, despite what the machine requires for | |
37 | instructions. */ | |
38 | ||
39 | static rtx | |
ef4bddc2 | 40 | gen_lowpart_for_debug (machine_mode mode, rtx x) |
e90c56c6 JJ |
41 | { |
42 | rtx result = gen_lowpart_if_possible (mode, x); | |
43 | if (result) | |
44 | return result; | |
45 | ||
46 | if (GET_MODE (x) != VOIDmode) | |
47 | return gen_rtx_raw_SUBREG (mode, x, | |
48 | subreg_lowpart_offset (mode, GET_MODE (x))); | |
49 | ||
50 | return NULL_RTX; | |
51 | } | |
52 | ||
08df6c0d AO |
53 | /* Replace auto-increment addressing modes with explicit operations to access |
54 | the same addresses without modifying the corresponding registers. */ | |
55 | ||
08df6c0d | 56 | static rtx |
ef4bddc2 | 57 | cleanup_auto_inc_dec (rtx src, machine_mode mem_mode ATTRIBUTE_UNUSED) |
08df6c0d AO |
58 | { |
59 | rtx x = src; | |
375e3d07 | 60 | #ifdef AUTO_INC_DEC |
08df6c0d AO |
61 | const RTX_CODE code = GET_CODE (x); |
62 | int i; | |
63 | const char *fmt; | |
64 | ||
65 | switch (code) | |
66 | { | |
67 | case REG: | |
d8116890 | 68 | CASE_CONST_ANY: |
08df6c0d AO |
69 | case SYMBOL_REF: |
70 | case CODE_LABEL: | |
71 | case PC: | |
72 | case CC0: | |
73 | case SCRATCH: | |
74 | /* SCRATCH must be shared because they represent distinct values. */ | |
75 | return x; | |
76 | case CLOBBER: | |
c5c5ba89 JH |
77 | /* Share clobbers of hard registers (like cc0), but do not share pseudo reg |
78 | clobbers or clobbers of hard registers that originated as pseudos. | |
79 | This is needed to allow safe register renaming. */ | |
80 | if (REG_P (XEXP (x, 0)) && REGNO (XEXP (x, 0)) < FIRST_PSEUDO_REGISTER | |
81 | && ORIGINAL_REGNO (XEXP (x, 0)) == REGNO (XEXP (x, 0))) | |
08df6c0d AO |
82 | return x; |
83 | break; | |
84 | ||
85 | case CONST: | |
86 | if (shared_const_p (x)) | |
87 | return x; | |
88 | break; | |
89 | ||
90 | case MEM: | |
91 | mem_mode = GET_MODE (x); | |
92 | break; | |
93 | ||
94 | case PRE_INC: | |
95 | case PRE_DEC: | |
96 | gcc_assert (mem_mode != VOIDmode && mem_mode != BLKmode); | |
97 | return gen_rtx_PLUS (GET_MODE (x), | |
98 | cleanup_auto_inc_dec (XEXP (x, 0), mem_mode), | |
4789c0ce RS |
99 | gen_int_mode (code == PRE_INC |
100 | ? GET_MODE_SIZE (mem_mode) | |
101 | : -GET_MODE_SIZE (mem_mode), | |
102 | GET_MODE (x))); | |
08df6c0d AO |
103 | |
104 | case POST_INC: | |
105 | case POST_DEC: | |
106 | case PRE_MODIFY: | |
107 | case POST_MODIFY: | |
108 | return cleanup_auto_inc_dec (code == PRE_MODIFY | |
109 | ? XEXP (x, 1) : XEXP (x, 0), | |
110 | mem_mode); | |
111 | ||
112 | default: | |
113 | break; | |
114 | } | |
115 | ||
116 | /* Copy the various flags, fields, and other information. We assume | |
117 | that all fields need copying, and then clear the fields that should | |
118 | not be copied. That is the sensible default behavior, and forces | |
119 | us to explicitly document why we are *not* copying a flag. */ | |
120 | x = shallow_copy_rtx (x); | |
121 | ||
122 | /* We do not copy the USED flag, which is used as a mark bit during | |
123 | walks over the RTL. */ | |
124 | RTX_FLAG (x, used) = 0; | |
125 | ||
126 | /* We do not copy FRAME_RELATED for INSNs. */ | |
127 | if (INSN_P (x)) | |
128 | RTX_FLAG (x, frame_related) = 0; | |
129 | ||
130 | fmt = GET_RTX_FORMAT (code); | |
131 | for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) | |
132 | if (fmt[i] == 'e') | |
133 | XEXP (x, i) = cleanup_auto_inc_dec (XEXP (x, i), mem_mode); | |
134 | else if (fmt[i] == 'E' || fmt[i] == 'V') | |
135 | { | |
136 | int j; | |
137 | XVEC (x, i) = rtvec_alloc (XVECLEN (x, i)); | |
138 | for (j = 0; j < XVECLEN (x, i); j++) | |
139 | XVECEXP (x, i, j) | |
140 | = cleanup_auto_inc_dec (XVECEXP (src, i, j), mem_mode); | |
141 | } | |
142 | ||
375e3d07 AO |
143 | #else /* !AUTO_INC_DEC */ |
144 | x = copy_rtx (x); | |
145 | #endif /* !AUTO_INC_DEC */ | |
146 | ||
08df6c0d AO |
147 | return x; |
148 | } | |
08df6c0d AO |
149 | |
150 | /* Auxiliary data structure for propagate_for_debug_stmt. */ | |
151 | ||
152 | struct rtx_subst_pair | |
153 | { | |
154 | rtx to; | |
155 | bool adjusted; | |
156 | }; | |
157 | ||
158 | /* DATA points to an rtx_subst_pair. Return the value that should be | |
159 | substituted. */ | |
160 | ||
161 | static rtx | |
162 | propagate_for_debug_subst (rtx from, const_rtx old_rtx, void *data) | |
163 | { | |
164 | struct rtx_subst_pair *pair = (struct rtx_subst_pair *)data; | |
165 | ||
166 | if (!rtx_equal_p (from, old_rtx)) | |
167 | return NULL_RTX; | |
168 | if (!pair->adjusted) | |
169 | { | |
170 | pair->adjusted = true; | |
08df6c0d | 171 | pair->to = cleanup_auto_inc_dec (pair->to, VOIDmode); |
08df6c0d AO |
172 | pair->to = make_compound_operation (pair->to, SET); |
173 | return pair->to; | |
174 | } | |
175 | return copy_rtx (pair->to); | |
176 | } | |
177 | ||
178 | /* Replace all the occurrences of DEST with SRC in DEBUG_INSNs between INSN | |
179 | and LAST, not including INSN, but including LAST. Also stop at the end | |
180 | of THIS_BASIC_BLOCK. */ | |
181 | ||
182 | void | |
dc01c3d1 | 183 | propagate_for_debug (rtx_insn *insn, rtx_insn *last, rtx dest, rtx src, |
08df6c0d AO |
184 | basic_block this_basic_block) |
185 | { | |
b2908ba6 DM |
186 | rtx_insn *next, *end = NEXT_INSN (BB_END (this_basic_block)); |
187 | rtx loc; | |
ef4bddc2 | 188 | rtx (*saved_rtl_hook_no_emit) (machine_mode, rtx); |
08df6c0d AO |
189 | |
190 | struct rtx_subst_pair p; | |
191 | p.to = src; | |
192 | p.adjusted = false; | |
193 | ||
194 | next = NEXT_INSN (insn); | |
195 | last = NEXT_INSN (last); | |
e90c56c6 JJ |
196 | saved_rtl_hook_no_emit = rtl_hooks.gen_lowpart_no_emit; |
197 | rtl_hooks.gen_lowpart_no_emit = gen_lowpart_for_debug; | |
08df6c0d AO |
198 | while (next != last && next != end) |
199 | { | |
200 | insn = next; | |
201 | next = NEXT_INSN (insn); | |
202 | if (DEBUG_INSN_P (insn)) | |
203 | { | |
204 | loc = simplify_replace_fn_rtx (INSN_VAR_LOCATION_LOC (insn), | |
205 | dest, propagate_for_debug_subst, &p); | |
206 | if (loc == INSN_VAR_LOCATION_LOC (insn)) | |
207 | continue; | |
208 | INSN_VAR_LOCATION_LOC (insn) = loc; | |
209 | df_insn_rescan (insn); | |
210 | } | |
211 | } | |
e90c56c6 | 212 | rtl_hooks.gen_lowpart_no_emit = saved_rtl_hook_no_emit; |
08df6c0d AO |
213 | } |
214 | ||
215 | /* Initialize DEBUG to an empty list, and clear USED, if given. */ | |
e9f950ba AO |
216 | |
217 | void | |
218 | dead_debug_global_init (struct dead_debug_global *debug, bitmap used) | |
219 | { | |
220 | debug->used = used; | |
c203e8a7 | 221 | debug->htab = NULL; |
e9f950ba AO |
222 | if (used) |
223 | bitmap_clear (used); | |
224 | } | |
225 | ||
226 | /* Initialize DEBUG to an empty list, and clear USED, if given. Link | |
227 | back to GLOBAL, if given, and bring in used bits from it. */ | |
228 | ||
08df6c0d | 229 | void |
e9f950ba AO |
230 | dead_debug_local_init (struct dead_debug_local *debug, bitmap used, |
231 | struct dead_debug_global *global) | |
08df6c0d | 232 | { |
e9f950ba AO |
233 | if (!used && global && global->used) |
234 | used = BITMAP_ALLOC (NULL); | |
235 | ||
08df6c0d | 236 | debug->head = NULL; |
e9f950ba | 237 | debug->global = global; |
08df6c0d AO |
238 | debug->used = used; |
239 | debug->to_rescan = NULL; | |
e9f950ba | 240 | |
08df6c0d | 241 | if (used) |
e9f950ba AO |
242 | { |
243 | if (global && global->used) | |
244 | bitmap_copy (used, global->used); | |
245 | else | |
246 | bitmap_clear (used); | |
247 | } | |
248 | } | |
249 | ||
250 | /* Locate the entry for REG in GLOBAL->htab. */ | |
251 | ||
252 | static dead_debug_global_entry * | |
253 | dead_debug_global_find (struct dead_debug_global *global, rtx reg) | |
254 | { | |
255 | dead_debug_global_entry temp_entry; | |
256 | temp_entry.reg = reg; | |
257 | ||
c203e8a7 | 258 | dead_debug_global_entry *entry = global->htab->find (&temp_entry); |
e9f950ba | 259 | gcc_checking_assert (entry && entry->reg == temp_entry.reg); |
e9f950ba AO |
260 | |
261 | return entry; | |
262 | } | |
263 | ||
264 | /* Insert an entry mapping REG to DTEMP in GLOBAL->htab. */ | |
265 | ||
0e45ec20 | 266 | static dead_debug_global_entry * |
e9f950ba AO |
267 | dead_debug_global_insert (struct dead_debug_global *global, rtx reg, rtx dtemp) |
268 | { | |
269 | dead_debug_global_entry temp_entry; | |
270 | temp_entry.reg = reg; | |
271 | temp_entry.dtemp = dtemp; | |
272 | ||
c203e8a7 TS |
273 | if (!global->htab) |
274 | global->htab = new hash_table<dead_debug_hash_descr> (31); | |
e9f950ba | 275 | |
c203e8a7 TS |
276 | dead_debug_global_entry **slot = global->htab->find_slot (&temp_entry, |
277 | INSERT); | |
e9f950ba AO |
278 | gcc_checking_assert (!*slot); |
279 | *slot = XNEW (dead_debug_global_entry); | |
280 | **slot = temp_entry; | |
0e45ec20 | 281 | return *slot; |
e9f950ba AO |
282 | } |
283 | ||
284 | /* If UREGNO, referenced by USE, is a pseudo marked as used in GLOBAL, | |
285 | replace it with with a USE of the debug temp recorded for it, and | |
286 | return TRUE. Otherwise, just return FALSE. | |
287 | ||
288 | If PTO_RESCAN is given, instead of rescanning modified INSNs right | |
289 | away, add their UIDs to the bitmap, allocating one of *PTO_RESCAN | |
290 | is NULL. */ | |
291 | ||
292 | static bool | |
293 | dead_debug_global_replace_temp (struct dead_debug_global *global, | |
294 | df_ref use, unsigned int uregno, | |
295 | bitmap *pto_rescan) | |
296 | { | |
297 | if (!global || uregno < FIRST_PSEUDO_REGISTER | |
298 | || !global->used | |
0e45ec20 AO |
299 | || !REG_P (*DF_REF_REAL_LOC (use)) |
300 | || REGNO (*DF_REF_REAL_LOC (use)) != uregno | |
e9f950ba AO |
301 | || !bitmap_bit_p (global->used, uregno)) |
302 | return false; | |
303 | ||
e9f950ba AO |
304 | dead_debug_global_entry *entry |
305 | = dead_debug_global_find (global, *DF_REF_REAL_LOC (use)); | |
306 | gcc_checking_assert (GET_CODE (entry->reg) == REG | |
307 | && REGNO (entry->reg) == uregno); | |
308 | ||
0e45ec20 AO |
309 | if (!entry->dtemp) |
310 | return true; | |
311 | ||
e9f950ba AO |
312 | *DF_REF_REAL_LOC (use) = entry->dtemp; |
313 | if (!pto_rescan) | |
314 | df_insn_rescan (DF_REF_INSN (use)); | |
315 | else | |
316 | { | |
317 | if (!*pto_rescan) | |
318 | *pto_rescan = BITMAP_ALLOC (NULL); | |
319 | bitmap_set_bit (*pto_rescan, INSN_UID (DF_REF_INSN (use))); | |
320 | } | |
321 | ||
322 | return true; | |
08df6c0d AO |
323 | } |
324 | ||
325 | /* Reset all debug uses in HEAD, and clear DEBUG->to_rescan bits of | |
326 | each reset insn. DEBUG is not otherwise modified. If HEAD is | |
327 | DEBUG->head, DEBUG->head will be set to NULL at the end. | |
328 | Otherwise, entries from DEBUG->head that pertain to reset insns | |
329 | will be removed, and only then rescanned. */ | |
330 | ||
331 | static void | |
e9f950ba AO |
332 | dead_debug_reset_uses (struct dead_debug_local *debug, |
333 | struct dead_debug_use *head) | |
08df6c0d AO |
334 | { |
335 | bool got_head = (debug->head == head); | |
336 | bitmap rescan; | |
337 | struct dead_debug_use **tailp = &debug->head; | |
338 | struct dead_debug_use *cur; | |
339 | bitmap_iterator bi; | |
340 | unsigned int uid; | |
341 | ||
342 | if (got_head) | |
343 | rescan = NULL; | |
344 | else | |
345 | rescan = BITMAP_ALLOC (NULL); | |
346 | ||
347 | while (head) | |
348 | { | |
349 | struct dead_debug_use *next = head->next; | |
1cbcd833 | 350 | rtx_insn *insn; |
08df6c0d AO |
351 | |
352 | insn = DF_REF_INSN (head->use); | |
353 | if (!next || DF_REF_INSN (next->use) != insn) | |
354 | { | |
355 | INSN_VAR_LOCATION_LOC (insn) = gen_rtx_UNKNOWN_VAR_LOC (); | |
356 | if (got_head) | |
357 | df_insn_rescan_debug_internal (insn); | |
358 | else | |
359 | bitmap_set_bit (rescan, INSN_UID (insn)); | |
360 | if (debug->to_rescan) | |
361 | bitmap_clear_bit (debug->to_rescan, INSN_UID (insn)); | |
362 | } | |
363 | XDELETE (head); | |
364 | head = next; | |
365 | } | |
366 | ||
367 | if (got_head) | |
368 | { | |
369 | debug->head = NULL; | |
370 | return; | |
371 | } | |
372 | ||
373 | while ((cur = *tailp)) | |
374 | if (bitmap_bit_p (rescan, INSN_UID (DF_REF_INSN (cur->use)))) | |
375 | { | |
376 | *tailp = cur->next; | |
377 | XDELETE (cur); | |
378 | } | |
379 | else | |
380 | tailp = &cur->next; | |
381 | ||
382 | EXECUTE_IF_SET_IN_BITMAP (rescan, 0, uid, bi) | |
383 | { | |
384 | struct df_insn_info *insn_info = DF_INSN_UID_SAFE_GET (uid); | |
385 | if (insn_info) | |
386 | df_insn_rescan_debug_internal (insn_info->insn); | |
387 | } | |
388 | ||
389 | BITMAP_FREE (rescan); | |
390 | } | |
391 | ||
e9f950ba AO |
392 | /* Promote pending local uses of pseudos in DEBUG to global |
393 | substitutions. Uses of non-pseudos are left alone for | |
394 | resetting. */ | |
395 | ||
396 | static void | |
397 | dead_debug_promote_uses (struct dead_debug_local *debug) | |
398 | { | |
399 | for (struct dead_debug_use *head = debug->head, **headp = &debug->head; | |
400 | head; head = *headp) | |
401 | { | |
402 | rtx reg = *DF_REF_REAL_LOC (head->use); | |
0e45ec20 AO |
403 | df_ref ref; |
404 | dead_debug_global_entry *entry; | |
e9f950ba AO |
405 | |
406 | if (GET_CODE (reg) != REG | |
407 | || REGNO (reg) < FIRST_PSEUDO_REGISTER) | |
408 | { | |
409 | headp = &head->next; | |
410 | continue; | |
411 | } | |
412 | ||
413 | if (!debug->global->used) | |
414 | debug->global->used = BITMAP_ALLOC (NULL); | |
415 | ||
f39b1a1a AO |
416 | bool added = bitmap_set_bit (debug->global->used, REGNO (reg)); |
417 | gcc_checking_assert (added); | |
418 | ||
419 | entry = dead_debug_global_insert (debug->global, reg, | |
420 | make_debug_expr_from_rtl (reg)); | |
e9f950ba | 421 | |
0e45ec20 AO |
422 | gcc_checking_assert (entry->dtemp); |
423 | ||
424 | /* Tentatively remove the USE from the list. */ | |
e9f950ba | 425 | *headp = head->next; |
0e45ec20 AO |
426 | |
427 | if (!debug->to_rescan) | |
428 | debug->to_rescan = BITMAP_ALLOC (NULL); | |
429 | ||
430 | for (ref = DF_REG_USE_CHAIN (REGNO (reg)); ref; | |
431 | ref = DF_REF_NEXT_REG (ref)) | |
432 | if (DEBUG_INSN_P (DF_REF_INSN (ref))) | |
433 | { | |
434 | if (!dead_debug_global_replace_temp (debug->global, ref, | |
435 | REGNO (reg), | |
436 | &debug->to_rescan)) | |
437 | { | |
1cbcd833 | 438 | rtx_insn *insn = DF_REF_INSN (ref); |
0e45ec20 AO |
439 | INSN_VAR_LOCATION_LOC (insn) = gen_rtx_UNKNOWN_VAR_LOC (); |
440 | bitmap_set_bit (debug->to_rescan, INSN_UID (insn)); | |
441 | } | |
442 | } | |
443 | ||
444 | for (ref = DF_REG_DEF_CHAIN (REGNO (reg)); ref; | |
445 | ref = DF_REF_NEXT_REG (ref)) | |
446 | if (!dead_debug_insert_temp (debug, REGNO (reg), DF_REF_INSN (ref), | |
447 | DEBUG_TEMP_BEFORE_WITH_VALUE)) | |
448 | { | |
449 | rtx bind; | |
450 | bind = gen_rtx_VAR_LOCATION (GET_MODE (reg), | |
451 | DEBUG_EXPR_TREE_DECL (entry->dtemp), | |
452 | gen_rtx_UNKNOWN_VAR_LOC (), | |
453 | VAR_INIT_STATUS_INITIALIZED); | |
1cbcd833 | 454 | rtx_insn *insn = emit_debug_insn_before (bind, DF_REF_INSN (ref)); |
0e45ec20 AO |
455 | bitmap_set_bit (debug->to_rescan, INSN_UID (insn)); |
456 | } | |
457 | ||
458 | entry->dtemp = NULL; | |
e9f950ba AO |
459 | XDELETE (head); |
460 | } | |
461 | } | |
462 | ||
08df6c0d AO |
463 | /* Reset all debug insns with pending uses. Release the bitmap in it, |
464 | unless it is USED. USED must be the same bitmap passed to | |
e9f950ba AO |
465 | dead_debug_local_init. */ |
466 | ||
08df6c0d | 467 | void |
e9f950ba | 468 | dead_debug_local_finish (struct dead_debug_local *debug, bitmap used) |
08df6c0d | 469 | { |
e9f950ba AO |
470 | if (debug->global) |
471 | dead_debug_promote_uses (debug); | |
472 | ||
0e45ec20 AO |
473 | if (debug->used != used) |
474 | BITMAP_FREE (debug->used); | |
475 | ||
08df6c0d AO |
476 | dead_debug_reset_uses (debug, debug->head); |
477 | ||
478 | if (debug->to_rescan) | |
479 | { | |
480 | bitmap_iterator bi; | |
481 | unsigned int uid; | |
482 | ||
483 | EXECUTE_IF_SET_IN_BITMAP (debug->to_rescan, 0, uid, bi) | |
484 | { | |
485 | struct df_insn_info *insn_info = DF_INSN_UID_SAFE_GET (uid); | |
486 | if (insn_info) | |
487 | df_insn_rescan (insn_info->insn); | |
488 | } | |
489 | BITMAP_FREE (debug->to_rescan); | |
490 | } | |
491 | } | |
492 | ||
e9f950ba AO |
493 | /* Release GLOBAL->used unless it is the same as USED. Release the |
494 | mapping hash table if it was initialized. */ | |
495 | ||
496 | void | |
497 | dead_debug_global_finish (struct dead_debug_global *global, bitmap used) | |
498 | { | |
499 | if (global->used != used) | |
500 | BITMAP_FREE (global->used); | |
501 | ||
c203e8a7 TS |
502 | delete global->htab; |
503 | global->htab = NULL; | |
e9f950ba AO |
504 | } |
505 | ||
506 | /* Add USE to DEBUG, or substitute it right away if it's a pseudo in | |
507 | the global substitution list. USE must be a dead reference to | |
508 | UREGNO in a debug insn. Create a bitmap for DEBUG as needed. */ | |
509 | ||
08df6c0d | 510 | void |
e9f950ba | 511 | dead_debug_add (struct dead_debug_local *debug, df_ref use, unsigned int uregno) |
08df6c0d | 512 | { |
e9f950ba AO |
513 | if (dead_debug_global_replace_temp (debug->global, use, uregno, |
514 | &debug->to_rescan)) | |
515 | return; | |
516 | ||
08df6c0d AO |
517 | struct dead_debug_use *newddu = XNEW (struct dead_debug_use); |
518 | ||
519 | newddu->use = use; | |
520 | newddu->next = debug->head; | |
521 | debug->head = newddu; | |
522 | ||
523 | if (!debug->used) | |
524 | debug->used = BITMAP_ALLOC (NULL); | |
525 | ||
526 | /* ??? If we dealt with split multi-registers below, we should set | |
527 | all registers for the used mode in case of hardware | |
528 | registers. */ | |
529 | bitmap_set_bit (debug->used, uregno); | |
530 | } | |
531 | ||
e488c24e JJ |
532 | /* Like lowpart_subreg, but if a subreg is not valid for machine, force |
533 | it anyway - for use in debug insns. */ | |
534 | ||
535 | static rtx | |
536 | debug_lowpart_subreg (machine_mode outer_mode, rtx expr, | |
537 | machine_mode inner_mode) | |
538 | { | |
539 | if (inner_mode == VOIDmode) | |
540 | inner_mode = GET_MODE (expr); | |
541 | int offset = subreg_lowpart_offset (outer_mode, inner_mode); | |
542 | rtx ret = simplify_gen_subreg (outer_mode, expr, inner_mode, offset); | |
543 | if (ret) | |
544 | return ret; | |
545 | return gen_rtx_raw_SUBREG (outer_mode, expr, offset); | |
546 | } | |
547 | ||
08df6c0d | 548 | /* If UREGNO is referenced by any entry in DEBUG, emit a debug insn |
e9f950ba AO |
549 | before or after INSN (depending on WHERE), that binds a (possibly |
550 | global) debug temp to the widest-mode use of UREGNO, if WHERE is | |
551 | *_WITH_REG, or the value stored in UREGNO by INSN otherwise, and | |
552 | replace all uses of UREGNO in DEBUG with uses of the debug temp. | |
553 | INSN must be where UREGNO dies, if WHERE is *_BEFORE_*, or where it | |
554 | is set otherwise. Return the number of debug insns emitted. */ | |
555 | ||
08df6c0d | 556 | int |
e9f950ba | 557 | dead_debug_insert_temp (struct dead_debug_local *debug, unsigned int uregno, |
f38a26e5 | 558 | rtx_insn *insn, enum debug_temp_where where) |
08df6c0d AO |
559 | { |
560 | struct dead_debug_use **tailp = &debug->head; | |
561 | struct dead_debug_use *cur; | |
562 | struct dead_debug_use *uses = NULL; | |
563 | struct dead_debug_use **usesp = &uses; | |
e9f950ba | 564 | rtx reg = NULL_RTX; |
08df6c0d | 565 | rtx breg; |
e9f950ba | 566 | rtx dval = NULL_RTX; |
08df6c0d | 567 | rtx bind; |
e9f950ba | 568 | bool global; |
08df6c0d | 569 | |
e9f950ba AO |
570 | if (!debug->used) |
571 | return 0; | |
572 | ||
573 | global = (debug->global && debug->global->used | |
574 | && bitmap_bit_p (debug->global->used, uregno)); | |
575 | ||
576 | if (!global && !bitmap_clear_bit (debug->used, uregno)) | |
08df6c0d AO |
577 | return 0; |
578 | ||
579 | /* Move all uses of uregno from debug->head to uses, setting mode to | |
580 | the widest referenced mode. */ | |
581 | while ((cur = *tailp)) | |
582 | { | |
583 | if (DF_REF_REGNO (cur->use) == uregno) | |
584 | { | |
d540153b JJ |
585 | /* If this loc has been changed e.g. to debug_expr already |
586 | as part of a multi-register use, just drop it. */ | |
587 | if (!REG_P (*DF_REF_REAL_LOC (cur->use))) | |
588 | { | |
589 | *tailp = cur->next; | |
590 | XDELETE (cur); | |
591 | continue; | |
592 | } | |
08df6c0d AO |
593 | *usesp = cur; |
594 | usesp = &cur->next; | |
595 | *tailp = cur->next; | |
596 | cur->next = NULL; | |
597 | if (!reg | |
598 | || (GET_MODE_BITSIZE (GET_MODE (reg)) | |
599 | < GET_MODE_BITSIZE (GET_MODE (*DF_REF_REAL_LOC (cur->use))))) | |
600 | reg = *DF_REF_REAL_LOC (cur->use); | |
601 | } | |
602 | else | |
603 | tailp = &(*tailp)->next; | |
604 | } | |
605 | ||
606 | /* We may have dangling bits in debug->used for registers that were part | |
607 | of a multi-register use, one component of which has been reset. */ | |
608 | if (reg == NULL) | |
609 | { | |
610 | gcc_checking_assert (!uses); | |
e9f950ba AO |
611 | if (!global) |
612 | return 0; | |
613 | } | |
614 | ||
615 | if (global) | |
616 | { | |
617 | if (!reg) | |
618 | reg = regno_reg_rtx[uregno]; | |
619 | dead_debug_global_entry *entry | |
620 | = dead_debug_global_find (debug->global, reg); | |
621 | gcc_checking_assert (entry->reg == reg); | |
622 | dval = entry->dtemp; | |
0e45ec20 AO |
623 | if (!dval) |
624 | return 0; | |
08df6c0d AO |
625 | } |
626 | ||
e9f950ba | 627 | gcc_checking_assert (uses || global); |
08df6c0d AO |
628 | |
629 | breg = reg; | |
630 | /* Recover the expression INSN stores in REG. */ | |
631 | if (where == DEBUG_TEMP_BEFORE_WITH_VALUE) | |
632 | { | |
633 | rtx set = single_set (insn); | |
634 | rtx dest, src; | |
635 | ||
636 | if (set) | |
637 | { | |
638 | dest = SET_DEST (set); | |
639 | src = SET_SRC (set); | |
640 | /* Lose if the REG-setting insn is a CALL. */ | |
641 | if (GET_CODE (src) == CALL) | |
642 | { | |
643 | while (uses) | |
644 | { | |
645 | cur = uses->next; | |
646 | XDELETE (uses); | |
647 | uses = cur; | |
648 | } | |
649 | return 0; | |
650 | } | |
651 | } | |
652 | ||
653 | /* ??? Should we try to extract it from a PARALLEL? */ | |
654 | if (!set) | |
655 | breg = NULL; | |
656 | /* Cool, it's the same REG, we can use SRC. */ | |
657 | else if (dest == reg) | |
e7206ab1 | 658 | breg = cleanup_auto_inc_dec (src, VOIDmode); |
08df6c0d AO |
659 | else if (REG_P (dest)) |
660 | { | |
661 | /* Hmm... Something's fishy, we should be setting REG here. */ | |
662 | if (REGNO (dest) != REGNO (reg)) | |
663 | breg = NULL; | |
664 | /* If we're not overwriting all the hardware registers that | |
665 | setting REG in its mode would, we won't know what to bind | |
666 | the debug temp to. ??? We could bind the debug_expr to a | |
667 | CONCAT or PARALLEL with the split multi-registers, and | |
668 | replace them as we found the corresponding sets. */ | |
dc8afb70 | 669 | else if (REG_NREGS (reg) != REG_NREGS (dest)) |
08df6c0d AO |
670 | breg = NULL; |
671 | /* Ok, it's the same (hardware) REG, but with a different | |
672 | mode, so SUBREG it. */ | |
673 | else | |
e488c24e JJ |
674 | breg = debug_lowpart_subreg (GET_MODE (reg), |
675 | cleanup_auto_inc_dec (src, VOIDmode), | |
676 | GET_MODE (dest)); | |
08df6c0d AO |
677 | } |
678 | else if (GET_CODE (dest) == SUBREG) | |
679 | { | |
680 | /* We should be setting REG here. Lose. */ | |
681 | if (REGNO (SUBREG_REG (dest)) != REGNO (reg)) | |
682 | breg = NULL; | |
683 | /* Lose if we're setting something other than the lowpart of | |
684 | REG. */ | |
685 | else if (!subreg_lowpart_p (dest)) | |
686 | breg = NULL; | |
687 | /* If we're not overwriting all the hardware registers that | |
688 | setting REG in its mode would, we won't know what to bind | |
689 | the debug temp to. */ | |
690 | else if (REGNO (reg) < FIRST_PSEUDO_REGISTER | |
dc8afb70 | 691 | && (REG_NREGS (reg) |
08df6c0d AO |
692 | != hard_regno_nregs[REGNO (reg)][GET_MODE (dest)])) |
693 | breg = NULL; | |
694 | /* Yay, we can use SRC, just adjust its mode. */ | |
695 | else | |
e488c24e JJ |
696 | breg = debug_lowpart_subreg (GET_MODE (reg), |
697 | cleanup_auto_inc_dec (src, VOIDmode), | |
698 | GET_MODE (dest)); | |
08df6c0d AO |
699 | } |
700 | /* Oh well, we're out of luck. */ | |
701 | else | |
702 | breg = NULL; | |
703 | ||
704 | /* We couldn't figure out the value stored in REG, so reset all | |
705 | of its pending debug uses. */ | |
706 | if (!breg) | |
707 | { | |
708 | dead_debug_reset_uses (debug, uses); | |
709 | return 0; | |
710 | } | |
711 | } | |
712 | ||
713 | /* If there's a single (debug) use of an otherwise unused REG, and | |
714 | the debug use is not part of a larger expression, then it | |
715 | probably doesn't make sense to introduce a new debug temp. */ | |
716 | if (where == DEBUG_TEMP_AFTER_WITH_REG && !uses->next) | |
717 | { | |
1cbcd833 | 718 | rtx_insn *next = DF_REF_INSN (uses->use); |
08df6c0d AO |
719 | |
720 | if (DEBUG_INSN_P (next) && reg == INSN_VAR_LOCATION_LOC (next)) | |
721 | { | |
722 | XDELETE (uses); | |
723 | return 0; | |
724 | } | |
725 | } | |
726 | ||
e9f950ba AO |
727 | if (!global) |
728 | /* Create DEBUG_EXPR (and DEBUG_EXPR_DECL). */ | |
729 | dval = make_debug_expr_from_rtl (reg); | |
08df6c0d AO |
730 | |
731 | /* Emit a debug bind insn before the insn in which reg dies. */ | |
732 | bind = gen_rtx_VAR_LOCATION (GET_MODE (reg), | |
733 | DEBUG_EXPR_TREE_DECL (dval), breg, | |
734 | VAR_INIT_STATUS_INITIALIZED); | |
735 | ||
85d87497 JJ |
736 | if (where == DEBUG_TEMP_AFTER_WITH_REG |
737 | || where == DEBUG_TEMP_AFTER_WITH_REG_FORCE) | |
08df6c0d AO |
738 | bind = emit_debug_insn_after (bind, insn); |
739 | else | |
740 | bind = emit_debug_insn_before (bind, insn); | |
36290bb4 AO |
741 | if (debug->to_rescan == NULL) |
742 | debug->to_rescan = BITMAP_ALLOC (NULL); | |
743 | bitmap_set_bit (debug->to_rescan, INSN_UID (bind)); | |
08df6c0d AO |
744 | |
745 | /* Adjust all uses. */ | |
746 | while ((cur = uses)) | |
747 | { | |
748 | if (GET_MODE (*DF_REF_REAL_LOC (cur->use)) == GET_MODE (reg)) | |
749 | *DF_REF_REAL_LOC (cur->use) = dval; | |
750 | else | |
751 | *DF_REF_REAL_LOC (cur->use) | |
e488c24e JJ |
752 | = debug_lowpart_subreg (GET_MODE (*DF_REF_REAL_LOC (cur->use)), dval, |
753 | GET_MODE (dval)); | |
08df6c0d | 754 | /* ??? Should we simplify subreg of subreg? */ |
08df6c0d AO |
755 | bitmap_set_bit (debug->to_rescan, INSN_UID (DF_REF_INSN (cur->use))); |
756 | uses = cur->next; | |
757 | XDELETE (cur); | |
758 | } | |
759 | ||
760 | return 1; | |
761 | } |