1 /* Scanning of rtl for dataflow analysis.
2 Copyright (C) 1999-2021 Free Software Foundation, Inc.
3 Originally contributed by Michael P. Hayes
4 (m.hayes@elec.canterbury.ac.nz, mhayes@redhat.com)
5 Major rewrite contributed by Danny Berlin (dberlin@dberlin.org)
6 and Kenneth Zadeck (zadeck@naturalbridge.com).
7
8 This file is part of GCC.
9
10 GCC is free software; you can redistribute it and/or modify it under
11 the terms of the GNU General Public License as published by the Free
12 Software Foundation; either version 3, or (at your option) any later
13 version.
14
15 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
16 WARRANTY; without even the implied warranty of MERCHANTABILITY or
17 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 for more details.
19
20 You should have received a copy of the GNU General Public License
21 along with GCC; see the file COPYING3. If not see
22 <http://www.gnu.org/licenses/>. */
23
24 #include "config.h"
25 #include "system.h"
26 #include "coretypes.h"
27 #include "backend.h"
28 #include "target.h"
29 #include "rtl.h"
30 #include "tree.h"
31 #include "df.h"
32 #include "memmodel.h"
33 #include "tm_p.h"
34 #include "regs.h"
35 #include "emit-rtl.h" /* FIXME: Can go away once crtl is moved to rtl.h. */
36 #include "dumpfile.h"
37 #include "calls.h"
38 #include "function-abi.h"
39
40 /* The set of hard registers in eliminables[i].from. */
41
42 static HARD_REG_SET elim_reg_set;
43
44 /* Initialize ur_in and ur_out as if all hard registers were partially
45 available. */
46
47 class df_collection_rec
48 {
49 public:
50 auto_vec<df_ref, 128> def_vec;
51 auto_vec<df_ref, 32> use_vec;
52 auto_vec<df_ref, 32> eq_use_vec;
53 auto_vec<df_mw_hardreg *, 32> mw_vec;
54 };
55
56 static void df_ref_record (enum df_ref_class, class df_collection_rec *,
57 rtx, rtx *,
58 basic_block, struct df_insn_info *,
59 enum df_ref_type, int ref_flags);
60 static void df_def_record_1 (class df_collection_rec *, rtx *,
61 basic_block, struct df_insn_info *,
62 int ref_flags);
63 static void df_defs_record (class df_collection_rec *, rtx,
64 basic_block, struct df_insn_info *,
65 int ref_flags);
66 static void df_uses_record (class df_collection_rec *,
67 rtx *, enum df_ref_type,
68 basic_block, struct df_insn_info *,
69 int ref_flags);
70
71 static void df_install_ref_incremental (df_ref);
72 static void df_insn_refs_collect (class df_collection_rec*,
73 basic_block, struct df_insn_info *);
74 static void df_canonize_collection_rec (class df_collection_rec *);
75
76 static void df_get_regular_block_artificial_uses (bitmap);
77 static void df_get_eh_block_artificial_uses (bitmap);
78
79 static void df_record_entry_block_defs (bitmap);
80 static void df_record_exit_block_uses (bitmap);
81 static void df_get_exit_block_use_set (bitmap);
82 static void df_get_entry_block_def_set (bitmap);
83 static void df_grow_ref_info (struct df_ref_info *, unsigned int);
84 static void df_ref_chain_delete_du_chain (df_ref);
85 static void df_ref_chain_delete (df_ref);
86
87 static void df_refs_add_to_chains (class df_collection_rec *,
88 basic_block, rtx_insn *, unsigned int);
89
90 static bool df_insn_refs_verify (class df_collection_rec *, basic_block,
91 rtx_insn *, bool);
92 static void df_entry_block_defs_collect (class df_collection_rec *, bitmap);
93 static void df_exit_block_uses_collect (class df_collection_rec *, bitmap);
94 static void df_install_ref (df_ref, struct df_reg_info *,
95 struct df_ref_info *, bool);
96
97 static int df_ref_compare (df_ref, df_ref);
98 static int df_ref_ptr_compare (const void *, const void *);
99 static int df_mw_compare (const df_mw_hardreg *, const df_mw_hardreg *);
100 static int df_mw_ptr_compare (const void *, const void *);
101
102 static void df_insn_info_delete (unsigned int);
103
104 /* Indexed by hardware reg number, is true if that register is ever
105 used in the current function.
106
107 In df-scan.c, this is set up to record the hard regs used
108 explicitly. Reload adds in the hard regs used for holding pseudo
109 regs. Final uses it to generate the code in the function prologue
110 and epilogue to save and restore registers as needed. */
111
112 static bool regs_ever_live[FIRST_PSEUDO_REGISTER];
113
114 /* Flags used to tell df_refs_add_to_chains() which vectors it should copy. */
115 static const unsigned int copy_defs = 0x1;
116 static const unsigned int copy_uses = 0x2;
117 static const unsigned int copy_eq_uses = 0x4;
118 static const unsigned int copy_mw = 0x8;
119 static const unsigned int copy_all = copy_defs | copy_uses | copy_eq_uses
120 | copy_mw;
121
122 /*----------------------------------------------------------------------------
123 SCANNING DATAFLOW PROBLEM
124
125 There are several ways in which scanning looks just like the other
126 dataflow problems. It shares the all the mechanisms for local info
127 as well as basic block info. Where it differs is when and how often
128 it gets run. It also has no need for the iterative solver.
129 ----------------------------------------------------------------------------*/
130
131 /* Problem data for the scanning dataflow function. */
132 struct df_scan_problem_data
133 {
134 object_allocator<df_base_ref> *ref_base_pool;
135 object_allocator<df_artificial_ref> *ref_artificial_pool;
136 object_allocator<df_regular_ref> *ref_regular_pool;
137 object_allocator<df_insn_info> *insn_pool;
138 object_allocator<df_reg_info> *reg_pool;
139 object_allocator<df_mw_hardreg> *mw_reg_pool;
140
141 bitmap_obstack reg_bitmaps;
142 bitmap_obstack insn_bitmaps;
143 };
144
145 /* Internal function to shut down the scanning problem. */
146 static void
df_scan_free_internal(void)147 df_scan_free_internal (void)
148 {
149 struct df_scan_problem_data *problem_data
150 = (struct df_scan_problem_data *) df_scan->problem_data;
151
152 free (df->def_info.refs);
153 free (df->def_info.begin);
154 free (df->def_info.count);
155 memset (&df->def_info, 0, (sizeof (struct df_ref_info)));
156
157 free (df->use_info.refs);
158 free (df->use_info.begin);
159 free (df->use_info.count);
160 memset (&df->use_info, 0, (sizeof (struct df_ref_info)));
161
162 free (df->def_regs);
163 df->def_regs = NULL;
164 free (df->use_regs);
165 df->use_regs = NULL;
166 free (df->eq_use_regs);
167 df->eq_use_regs = NULL;
168 df->regs_size = 0;
169 DF_REG_SIZE (df) = 0;
170
171 free (df->insns);
172 df->insns = NULL;
173 DF_INSN_SIZE () = 0;
174
175 free (df_scan->block_info);
176 df_scan->block_info = NULL;
177 df_scan->block_info_size = 0;
178
179 bitmap_clear (&df->hardware_regs_used);
180 bitmap_clear (&df->regular_block_artificial_uses);
181 bitmap_clear (&df->eh_block_artificial_uses);
182 BITMAP_FREE (df->entry_block_defs);
183 BITMAP_FREE (df->exit_block_uses);
184 bitmap_clear (&df->insns_to_delete);
185 bitmap_clear (&df->insns_to_rescan);
186 bitmap_clear (&df->insns_to_notes_rescan);
187
188 delete problem_data->ref_base_pool;
189 delete problem_data->ref_artificial_pool;
190 delete problem_data->ref_regular_pool;
191 delete problem_data->insn_pool;
192 delete problem_data->reg_pool;
193 delete problem_data->mw_reg_pool;
194 bitmap_obstack_release (&problem_data->reg_bitmaps);
195 bitmap_obstack_release (&problem_data->insn_bitmaps);
196 free (df_scan->problem_data);
197 }
198
199
200 /* Free basic block info. */
201
202 static void
df_scan_free_bb_info(basic_block bb,void * vbb_info)203 df_scan_free_bb_info (basic_block bb, void *vbb_info)
204 {
205 struct df_scan_bb_info *bb_info = (struct df_scan_bb_info *) vbb_info;
206 unsigned int bb_index = bb->index;
207 rtx_insn *insn;
208
209 FOR_BB_INSNS (bb, insn)
210 if (INSN_P (insn))
211 df_insn_info_delete (INSN_UID (insn));
212
213 if (bb_index < df_scan->block_info_size)
214 bb_info = df_scan_get_bb_info (bb_index);
215
216 /* Get rid of any artificial uses or defs. */
217 df_ref_chain_delete_du_chain (bb_info->artificial_defs);
218 df_ref_chain_delete_du_chain (bb_info->artificial_uses);
219 df_ref_chain_delete (bb_info->artificial_defs);
220 df_ref_chain_delete (bb_info->artificial_uses);
221 bb_info->artificial_defs = NULL;
222 bb_info->artificial_uses = NULL;
223 }
224
225
226 /* Allocate the problem data for the scanning problem. This should be
227 called when the problem is created or when the entire function is to
228 be rescanned. */
229 void
df_scan_alloc(bitmap all_blocks ATTRIBUTE_UNUSED)230 df_scan_alloc (bitmap all_blocks ATTRIBUTE_UNUSED)
231 {
232 struct df_scan_problem_data *problem_data;
233 basic_block bb;
234
235 /* Given the number of pools, this is really faster than tearing
236 everything apart. */
237 if (df_scan->problem_data)
238 df_scan_free_internal ();
239
240 problem_data = XNEW (struct df_scan_problem_data);
241 df_scan->problem_data = problem_data;
242 df_scan->computed = true;
243
244 problem_data->ref_base_pool = new object_allocator<df_base_ref>
245 ("df_scan ref base");
246 problem_data->ref_artificial_pool = new object_allocator<df_artificial_ref>
247 ("df_scan ref artificial");
248 problem_data->ref_regular_pool = new object_allocator<df_regular_ref>
249 ("df_scan ref regular");
250 problem_data->insn_pool = new object_allocator<df_insn_info>
251 ("df_scan insn");
252 problem_data->reg_pool = new object_allocator<df_reg_info>
253 ("df_scan reg");
254 problem_data->mw_reg_pool = new object_allocator<df_mw_hardreg>
255 ("df_scan mw_reg");
256
257 bitmap_obstack_initialize (&problem_data->reg_bitmaps);
258 bitmap_obstack_initialize (&problem_data->insn_bitmaps);
259
260 df_grow_reg_info ();
261
262 df_grow_insn_info ();
263 df_grow_bb_info (df_scan);
264
265 FOR_ALL_BB_FN (bb, cfun)
266 {
267 unsigned int bb_index = bb->index;
268 struct df_scan_bb_info *bb_info = df_scan_get_bb_info (bb_index);
269 bb_info->artificial_defs = NULL;
270 bb_info->artificial_uses = NULL;
271 }
272
273 bitmap_initialize (&df->hardware_regs_used, &problem_data->reg_bitmaps);
274 bitmap_initialize (&df->regular_block_artificial_uses, &problem_data->reg_bitmaps);
275 bitmap_initialize (&df->eh_block_artificial_uses, &problem_data->reg_bitmaps);
276 df->entry_block_defs = BITMAP_ALLOC (&problem_data->reg_bitmaps);
277 df->exit_block_uses = BITMAP_ALLOC (&problem_data->reg_bitmaps);
278 bitmap_initialize (&df->insns_to_delete, &problem_data->insn_bitmaps);
279 bitmap_initialize (&df->insns_to_rescan, &problem_data->insn_bitmaps);
280 bitmap_initialize (&df->insns_to_notes_rescan, &problem_data->insn_bitmaps);
281 df_scan->optional_p = false;
282 }
283
284
285 /* Free all of the data associated with the scan problem. */
286
287 static void
df_scan_free(void)288 df_scan_free (void)
289 {
290 if (df_scan->problem_data)
291 df_scan_free_internal ();
292
293 if (df->blocks_to_analyze)
294 {
295 BITMAP_FREE (df->blocks_to_analyze);
296 df->blocks_to_analyze = NULL;
297 }
298
299 free (df_scan);
300 }
301
302 /* Dump the preamble for DF_SCAN dump. */
303 static void
df_scan_start_dump(FILE * file ATTRIBUTE_UNUSED)304 df_scan_start_dump (FILE *file ATTRIBUTE_UNUSED)
305 {
306 int i;
307 int dcount = 0;
308 int ucount = 0;
309 int ecount = 0;
310 int icount = 0;
311 int ccount = 0;
312 basic_block bb;
313 rtx_insn *insn;
314
315 fprintf (file, ";; fully invalidated by EH \t");
316 df_print_regset
317 (file, bitmap_view<HARD_REG_SET> (eh_edge_abi.full_reg_clobbers ()));
318 fprintf (file, ";; hardware regs used \t");
319 df_print_regset (file, &df->hardware_regs_used);
320 fprintf (file, ";; regular block artificial uses \t");
321 df_print_regset (file, &df->regular_block_artificial_uses);
322 fprintf (file, ";; eh block artificial uses \t");
323 df_print_regset (file, &df->eh_block_artificial_uses);
324 fprintf (file, ";; entry block defs \t");
325 df_print_regset (file, df->entry_block_defs);
326 fprintf (file, ";; exit block uses \t");
327 df_print_regset (file, df->exit_block_uses);
328 fprintf (file, ";; regs ever live \t");
329 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
330 if (df_regs_ever_live_p (i))
331 fprintf (file, " %d [%s]", i, reg_names[i]);
332 fprintf (file, "\n;; ref usage \t");
333
334 for (i = 0; i < (int)df->regs_inited; i++)
335 if (DF_REG_DEF_COUNT (i) || DF_REG_USE_COUNT (i) || DF_REG_EQ_USE_COUNT (i))
336 {
337 const char * sep = "";
338
339 fprintf (file, "r%d={", i);
340 if (DF_REG_DEF_COUNT (i))
341 {
342 fprintf (file, "%dd", DF_REG_DEF_COUNT (i));
343 sep = ",";
344 dcount += DF_REG_DEF_COUNT (i);
345 }
346 if (DF_REG_USE_COUNT (i))
347 {
348 fprintf (file, "%s%du", sep, DF_REG_USE_COUNT (i));
349 sep = ",";
350 ucount += DF_REG_USE_COUNT (i);
351 }
352 if (DF_REG_EQ_USE_COUNT (i))
353 {
354 fprintf (file, "%s%de", sep, DF_REG_EQ_USE_COUNT (i));
355 ecount += DF_REG_EQ_USE_COUNT (i);
356 }
357 fprintf (file, "} ");
358 }
359
360 FOR_EACH_BB_FN (bb, cfun)
361 FOR_BB_INSNS (bb, insn)
362 if (INSN_P (insn))
363 {
364 if (CALL_P (insn))
365 ccount++;
366 else
367 icount++;
368 }
369
370 fprintf (file, "\n;; total ref usage %d{%dd,%du,%de}"
371 " in %d{%d regular + %d call} insns.\n",
372 dcount + ucount + ecount, dcount, ucount, ecount,
373 icount + ccount, icount, ccount);
374 }
375
376 /* Dump the bb_info for a given basic block. */
377 static void
df_scan_start_block(basic_block bb,FILE * file)378 df_scan_start_block (basic_block bb, FILE *file)
379 {
380 struct df_scan_bb_info *bb_info
381 = df_scan_get_bb_info (bb->index);
382
383 if (bb_info)
384 {
385 fprintf (file, ";; bb %d artificial_defs: ", bb->index);
386 df_refs_chain_dump (bb_info->artificial_defs, true, file);
387 fprintf (file, "\n;; bb %d artificial_uses: ", bb->index);
388 df_refs_chain_dump (bb_info->artificial_uses, true, file);
389 fprintf (file, "\n");
390 }
391 #if 0
392 {
393 rtx_insn *insn;
394 FOR_BB_INSNS (bb, insn)
395 if (INSN_P (insn))
396 df_insn_debug (insn, false, file);
397 }
398 #endif
399 }
400
401 static const struct df_problem problem_SCAN =
402 {
403 DF_SCAN, /* Problem id. */
404 DF_NONE, /* Direction. */
405 df_scan_alloc, /* Allocate the problem specific data. */
406 NULL, /* Reset global information. */
407 df_scan_free_bb_info, /* Free basic block info. */
408 NULL, /* Local compute function. */
409 NULL, /* Init the solution specific data. */
410 NULL, /* Iterative solver. */
411 NULL, /* Confluence operator 0. */
412 NULL, /* Confluence operator n. */
413 NULL, /* Transfer function. */
414 NULL, /* Finalize function. */
415 df_scan_free, /* Free all of the problem information. */
416 NULL, /* Remove this problem from the stack of dataflow problems. */
417 df_scan_start_dump, /* Debugging. */
418 df_scan_start_block, /* Debugging start block. */
419 NULL, /* Debugging end block. */
420 NULL, /* Debugging start insn. */
421 NULL, /* Debugging end insn. */
422 NULL, /* Incremental solution verify start. */
423 NULL, /* Incremental solution verify end. */
424 NULL, /* Dependent problem. */
425 sizeof (struct df_scan_bb_info),/* Size of entry of block_info array. */
426 TV_DF_SCAN, /* Timing variable. */
427 false /* Reset blocks on dropping out of blocks_to_analyze. */
428 };
429
430
431 /* Create a new DATAFLOW instance and add it to an existing instance
432 of DF. The returned structure is what is used to get at the
433 solution. */
434
435 void
df_scan_add_problem(void)436 df_scan_add_problem (void)
437 {
438 df_add_problem (&problem_SCAN);
439 }
440
441
442 /*----------------------------------------------------------------------------
443 Storage Allocation Utilities
444 ----------------------------------------------------------------------------*/
445
446
447 /* First, grow the reg_info information. If the current size is less than
448 the number of pseudos, grow to 25% more than the number of
449 pseudos.
450
451 Second, assure that all of the slots up to max_reg_num have been
452 filled with reg_info structures. */
453
454 void
df_grow_reg_info(void)455 df_grow_reg_info (void)
456 {
457 unsigned int max_reg = max_reg_num ();
458 unsigned int new_size = max_reg;
459 struct df_scan_problem_data *problem_data
460 = (struct df_scan_problem_data *) df_scan->problem_data;
461 unsigned int i;
462
463 if (df->regs_size < new_size)
464 {
465 new_size += new_size / 4;
466 df->def_regs = XRESIZEVEC (struct df_reg_info *, df->def_regs, new_size);
467 df->use_regs = XRESIZEVEC (struct df_reg_info *, df->use_regs, new_size);
468 df->eq_use_regs = XRESIZEVEC (struct df_reg_info *, df->eq_use_regs,
469 new_size);
470 df->def_info.begin = XRESIZEVEC (unsigned, df->def_info.begin, new_size);
471 df->def_info.count = XRESIZEVEC (unsigned, df->def_info.count, new_size);
472 df->use_info.begin = XRESIZEVEC (unsigned, df->use_info.begin, new_size);
473 df->use_info.count = XRESIZEVEC (unsigned, df->use_info.count, new_size);
474 df->regs_size = new_size;
475 }
476
477 for (i = df->regs_inited; i < max_reg; i++)
478 {
479 struct df_reg_info *reg_info;
480
481 // TODO
482 reg_info = problem_data->reg_pool->allocate ();
483 memset (reg_info, 0, sizeof (struct df_reg_info));
484 df->def_regs[i] = reg_info;
485 reg_info = problem_data->reg_pool->allocate ();
486 memset (reg_info, 0, sizeof (struct df_reg_info));
487 df->use_regs[i] = reg_info;
488 reg_info = problem_data->reg_pool->allocate ();
489 memset (reg_info, 0, sizeof (struct df_reg_info));
490 df->eq_use_regs[i] = reg_info;
491 df->def_info.begin[i] = 0;
492 df->def_info.count[i] = 0;
493 df->use_info.begin[i] = 0;
494 df->use_info.count[i] = 0;
495 }
496
497 df->regs_inited = max_reg;
498 }
499
500
501 /* Grow the ref information. */
502
503 static void
df_grow_ref_info(struct df_ref_info * ref_info,unsigned int new_size)504 df_grow_ref_info (struct df_ref_info *ref_info, unsigned int new_size)
505 {
506 if (ref_info->refs_size < new_size)
507 {
508 ref_info->refs = XRESIZEVEC (df_ref, ref_info->refs, new_size);
509 memset (ref_info->refs + ref_info->refs_size, 0,
510 (new_size - ref_info->refs_size) *sizeof (df_ref));
511 ref_info->refs_size = new_size;
512 }
513 }
514
515
516 /* Check and grow the ref information if necessary. This routine
517 guarantees total_size + BITMAP_ADDEND amount of entries in refs
518 array. It updates ref_info->refs_size only and does not change
519 ref_info->total_size. */
520
521 static void
df_check_and_grow_ref_info(struct df_ref_info * ref_info,unsigned bitmap_addend)522 df_check_and_grow_ref_info (struct df_ref_info *ref_info,
523 unsigned bitmap_addend)
524 {
525 if (ref_info->refs_size < ref_info->total_size + bitmap_addend)
526 {
527 int new_size = ref_info->total_size + bitmap_addend;
528 new_size += ref_info->total_size / 4;
529 df_grow_ref_info (ref_info, new_size);
530 }
531 }
532
533
534 /* Grow the ref information. If the current size is less than the
535 number of instructions, grow to 25% more than the number of
536 instructions. */
537
538 void
df_grow_insn_info(void)539 df_grow_insn_info (void)
540 {
541 unsigned int new_size = get_max_uid () + 1;
542 if (DF_INSN_SIZE () < new_size)
543 {
544 new_size += new_size / 4;
545 df->insns = XRESIZEVEC (struct df_insn_info *, df->insns, new_size);
546 memset (df->insns + df->insns_size, 0,
547 (new_size - DF_INSN_SIZE ()) *sizeof (struct df_insn_info *));
548 DF_INSN_SIZE () = new_size;
549 }
550 }
551
552
553
554
555 /*----------------------------------------------------------------------------
556 PUBLIC INTERFACES FOR SMALL GRAIN CHANGES TO SCANNING.
557 ----------------------------------------------------------------------------*/
558
559 /* Rescan all of the block_to_analyze or all of the blocks in the
560 function if df_set_blocks if blocks_to_analyze is NULL; */
561
562 void
df_scan_blocks(void)563 df_scan_blocks (void)
564 {
565 basic_block bb;
566
567 df->def_info.ref_order = DF_REF_ORDER_NO_TABLE;
568 df->use_info.ref_order = DF_REF_ORDER_NO_TABLE;
569
570 df_get_regular_block_artificial_uses (&df->regular_block_artificial_uses);
571 df_get_eh_block_artificial_uses (&df->eh_block_artificial_uses);
572
573 bitmap_ior_into (&df->eh_block_artificial_uses,
574 &df->regular_block_artificial_uses);
575
576 /* ENTRY and EXIT blocks have special defs/uses. */
577 df_get_entry_block_def_set (df->entry_block_defs);
578 df_record_entry_block_defs (df->entry_block_defs);
579 df_get_exit_block_use_set (df->exit_block_uses);
580 df_record_exit_block_uses (df->exit_block_uses);
581 df_set_bb_dirty (BASIC_BLOCK_FOR_FN (cfun, ENTRY_BLOCK));
582 df_set_bb_dirty (BASIC_BLOCK_FOR_FN (cfun, EXIT_BLOCK));
583
584 /* Regular blocks */
585 FOR_EACH_BB_FN (bb, cfun)
586 {
587 unsigned int bb_index = bb->index;
588 df_bb_refs_record (bb_index, true);
589 }
590 }
591
592 /* Create new refs under address LOC within INSN. This function is
593 only used externally. REF_FLAGS must be either 0 or DF_REF_IN_NOTE,
594 depending on whether LOC is inside PATTERN (INSN) or a note. */
595
596 void
df_uses_create(rtx * loc,rtx_insn * insn,int ref_flags)597 df_uses_create (rtx *loc, rtx_insn *insn, int ref_flags)
598 {
599 gcc_assert (!(ref_flags & ~DF_REF_IN_NOTE));
600 df_uses_record (NULL, loc, DF_REF_REG_USE,
601 BLOCK_FOR_INSN (insn),
602 DF_INSN_INFO_GET (insn),
603 ref_flags);
604 }
605
606 static void
df_install_ref_incremental(df_ref ref)607 df_install_ref_incremental (df_ref ref)
608 {
609 struct df_reg_info **reg_info;
610 struct df_ref_info *ref_info;
611 df_ref *ref_ptr;
612 bool add_to_table;
613
614 rtx_insn *insn = DF_REF_INSN (ref);
615 basic_block bb = BLOCK_FOR_INSN (insn);
616
617 if (DF_REF_REG_DEF_P (ref))
618 {
619 reg_info = df->def_regs;
620 ref_info = &df->def_info;
621 ref_ptr = &DF_INSN_DEFS (insn);
622 add_to_table = ref_info->ref_order != DF_REF_ORDER_NO_TABLE;
623 }
624 else if (DF_REF_FLAGS (ref) & DF_REF_IN_NOTE)
625 {
626 reg_info = df->eq_use_regs;
627 ref_info = &df->use_info;
628 ref_ptr = &DF_INSN_EQ_USES (insn);
629 switch (ref_info->ref_order)
630 {
631 case DF_REF_ORDER_UNORDERED_WITH_NOTES:
632 case DF_REF_ORDER_BY_REG_WITH_NOTES:
633 case DF_REF_ORDER_BY_INSN_WITH_NOTES:
634 add_to_table = true;
635 break;
636 default:
637 add_to_table = false;
638 break;
639 }
640 }
641 else
642 {
643 reg_info = df->use_regs;
644 ref_info = &df->use_info;
645 ref_ptr = &DF_INSN_USES (insn);
646 add_to_table = ref_info->ref_order != DF_REF_ORDER_NO_TABLE;
647 }
648
649 /* Do not add if ref is not in the right blocks. */
650 if (add_to_table && df->analyze_subset)
651 add_to_table = bitmap_bit_p (df->blocks_to_analyze, bb->index);
652
653 df_install_ref (ref, reg_info[DF_REF_REGNO (ref)], ref_info, add_to_table);
654
655 if (add_to_table)
656 switch (ref_info->ref_order)
657 {
658 case DF_REF_ORDER_UNORDERED_WITH_NOTES:
659 case DF_REF_ORDER_BY_REG_WITH_NOTES:
660 case DF_REF_ORDER_BY_INSN_WITH_NOTES:
661 ref_info->ref_order = DF_REF_ORDER_UNORDERED_WITH_NOTES;
662 break;
663 default:
664 ref_info->ref_order = DF_REF_ORDER_UNORDERED;
665 break;
666 }
667
668 while (*ref_ptr && df_ref_compare (*ref_ptr, ref) < 0)
669 ref_ptr = &DF_REF_NEXT_LOC (*ref_ptr);
670
671 DF_REF_NEXT_LOC (ref) = *ref_ptr;
672 *ref_ptr = ref;
673
674 #if 0
675 if (dump_file)
676 {
677 fprintf (dump_file, "adding ref ");
678 df_ref_debug (ref, dump_file);
679 }
680 #endif
681 /* By adding the ref directly, df_insn_rescan my not find any
682 differences even though the block will have changed. So we need
683 to mark the block dirty ourselves. */
684 if (!DEBUG_INSN_P (DF_REF_INSN (ref)))
685 df_set_bb_dirty (bb);
686 }
687
688
689
690 /*----------------------------------------------------------------------------
691 UTILITIES TO CREATE AND DESTROY REFS AND CHAINS.
692 ----------------------------------------------------------------------------*/
693
694 static void
df_free_ref(df_ref ref)695 df_free_ref (df_ref ref)
696 {
697 struct df_scan_problem_data *problem_data
698 = (struct df_scan_problem_data *) df_scan->problem_data;
699
700 switch (DF_REF_CLASS (ref))
701 {
702 case DF_REF_BASE:
703 problem_data->ref_base_pool->remove ((df_base_ref *) (ref));
704 break;
705
706 case DF_REF_ARTIFICIAL:
707 problem_data->ref_artificial_pool->remove
708 ((df_artificial_ref *) (ref));
709 break;
710
711 case DF_REF_REGULAR:
712 problem_data->ref_regular_pool->remove
713 ((df_regular_ref *) (ref));
714 break;
715 }
716 }
717
718
719 /* Unlink and delete REF at the reg_use, reg_eq_use or reg_def chain.
720 Also delete the def-use or use-def chain if it exists. */
721
722 static void
df_reg_chain_unlink(df_ref ref)723 df_reg_chain_unlink (df_ref ref)
724 {
725 df_ref next = DF_REF_NEXT_REG (ref);
726 df_ref prev = DF_REF_PREV_REG (ref);
727 int id = DF_REF_ID (ref);
728 struct df_reg_info *reg_info;
729 df_ref *refs = NULL;
730
731 if (DF_REF_REG_DEF_P (ref))
732 {
733 int regno = DF_REF_REGNO (ref);
734 reg_info = DF_REG_DEF_GET (regno);
735 refs = df->def_info.refs;
736 }
737 else
738 {
739 if (DF_REF_FLAGS (ref) & DF_REF_IN_NOTE)
740 {
741 reg_info = DF_REG_EQ_USE_GET (DF_REF_REGNO (ref));
742 switch (df->use_info.ref_order)
743 {
744 case DF_REF_ORDER_UNORDERED_WITH_NOTES:
745 case DF_REF_ORDER_BY_REG_WITH_NOTES:
746 case DF_REF_ORDER_BY_INSN_WITH_NOTES:
747 refs = df->use_info.refs;
748 break;
749 default:
750 break;
751 }
752 }
753 else
754 {
755 reg_info = DF_REG_USE_GET (DF_REF_REGNO (ref));
756 refs = df->use_info.refs;
757 }
758 }
759
760 if (refs)
761 {
762 if (df->analyze_subset)
763 {
764 if (bitmap_bit_p (df->blocks_to_analyze, DF_REF_BBNO (ref)))
765 refs[id] = NULL;
766 }
767 else
768 refs[id] = NULL;
769 }
770
771 /* Delete any def-use or use-def chains that start here. It is
772 possible that there is trash in this field. This happens for
773 insns that have been deleted when rescanning has been deferred
774 and the chain problem has also been deleted. The chain tear down
775 code skips deleted insns. */
776 if (df_chain && DF_REF_CHAIN (ref))
777 df_chain_unlink (ref);
778
779 reg_info->n_refs--;
780 if (DF_REF_FLAGS_IS_SET (ref, DF_HARD_REG_LIVE))
781 {
782 gcc_assert (DF_REF_REGNO (ref) < FIRST_PSEUDO_REGISTER);
783 df->hard_regs_live_count[DF_REF_REGNO (ref)]--;
784 }
785
786 /* Unlink from the reg chain. If there is no prev, this is the
787 first of the list. If not, just join the next and prev. */
788 if (prev)
789 DF_REF_NEXT_REG (prev) = next;
790 else
791 {
792 gcc_assert (reg_info->reg_chain == ref);
793 reg_info->reg_chain = next;
794 }
795 if (next)
796 DF_REF_PREV_REG (next) = prev;
797
798 df_free_ref (ref);
799 }
800
801 /* Initialize INSN_INFO to describe INSN. */
802
803 static void
df_insn_info_init_fields(df_insn_info * insn_info,rtx_insn * insn)804 df_insn_info_init_fields (df_insn_info *insn_info, rtx_insn *insn)
805 {
806 memset (insn_info, 0, sizeof (struct df_insn_info));
807 insn_info->insn = insn;
808 }
809
810 /* Create the insn record for INSN. If there was one there, zero it
811 out. */
812
813 struct df_insn_info *
df_insn_create_insn_record(rtx_insn * insn)814 df_insn_create_insn_record (rtx_insn *insn)
815 {
816 struct df_scan_problem_data *problem_data
817 = (struct df_scan_problem_data *) df_scan->problem_data;
818 struct df_insn_info *insn_rec;
819
820 df_grow_insn_info ();
821 insn_rec = DF_INSN_INFO_GET (insn);
822 if (!insn_rec)
823 {
824 insn_rec = problem_data->insn_pool->allocate ();
825 DF_INSN_INFO_SET (insn, insn_rec);
826 }
827 df_insn_info_init_fields (insn_rec, insn);
828 return insn_rec;
829 }
830
831
832 /* Delete all du chain (DF_REF_CHAIN()) of all refs in the ref chain. */
833
834 static void
df_ref_chain_delete_du_chain(df_ref ref)835 df_ref_chain_delete_du_chain (df_ref ref)
836 {
837 for (; ref; ref = DF_REF_NEXT_LOC (ref))
838 /* CHAIN is allocated by DF_CHAIN. So make sure to
839 pass df_scan instance for the problem. */
840 if (DF_REF_CHAIN (ref))
841 df_chain_unlink (ref);
842 }
843
844
845 /* Delete all refs in the ref chain. */
846
847 static void
df_ref_chain_delete(df_ref ref)848 df_ref_chain_delete (df_ref ref)
849 {
850 df_ref next;
851 for (; ref; ref = next)
852 {
853 next = DF_REF_NEXT_LOC (ref);
854 df_reg_chain_unlink (ref);
855 }
856 }
857
858
859 /* Delete the hardreg chain. */
860
861 static void
df_mw_hardreg_chain_delete(struct df_mw_hardreg * hardregs)862 df_mw_hardreg_chain_delete (struct df_mw_hardreg *hardregs)
863 {
864 struct df_scan_problem_data *problem_data
865 = (struct df_scan_problem_data *) df_scan->problem_data;
866 df_mw_hardreg *next;
867
868 for (; hardregs; hardregs = next)
869 {
870 next = DF_MWS_NEXT (hardregs);
871 problem_data->mw_reg_pool->remove (hardregs);
872 }
873 }
874
875 /* Remove the contents of INSN_INFO (but don't free INSN_INFO itself). */
876
877 static void
df_insn_info_free_fields(df_insn_info * insn_info)878 df_insn_info_free_fields (df_insn_info *insn_info)
879 {
880 /* In general, notes do not have the insn_info fields
881 initialized. However, combine deletes insns by changing them
882 to notes. How clever. So we cannot just check if it is a
883 valid insn before short circuiting this code, we need to see
884 if we actually initialized it. */
885 df_mw_hardreg_chain_delete (insn_info->mw_hardregs);
886
887 if (df_chain)
888 {
889 df_ref_chain_delete_du_chain (insn_info->defs);
890 df_ref_chain_delete_du_chain (insn_info->uses);
891 df_ref_chain_delete_du_chain (insn_info->eq_uses);
892 }
893
894 df_ref_chain_delete (insn_info->defs);
895 df_ref_chain_delete (insn_info->uses);
896 df_ref_chain_delete (insn_info->eq_uses);
897 }
898
899 /* Delete all of the refs information from the insn with UID.
900 Internal helper for df_insn_delete, df_insn_rescan, and other
901 df-scan routines that don't have to work in deferred mode
902 and do not have to mark basic blocks for re-processing. */
903
904 static void
df_insn_info_delete(unsigned int uid)905 df_insn_info_delete (unsigned int uid)
906 {
907 struct df_insn_info *insn_info = DF_INSN_UID_SAFE_GET (uid);
908
909 bitmap_clear_bit (&df->insns_to_delete, uid);
910 bitmap_clear_bit (&df->insns_to_rescan, uid);
911 bitmap_clear_bit (&df->insns_to_notes_rescan, uid);
912 if (insn_info)
913 {
914 struct df_scan_problem_data *problem_data
915 = (struct df_scan_problem_data *) df_scan->problem_data;
916
917 df_insn_info_free_fields (insn_info);
918 problem_data->insn_pool->remove (insn_info);
919 DF_INSN_UID_SET (uid, NULL);
920 }
921 }
922
923 /* Delete all of the refs information from INSN, either right now
924 or marked for later in deferred mode. */
925
926 void
df_insn_delete(rtx_insn * insn)927 df_insn_delete (rtx_insn *insn)
928 {
929 unsigned int uid;
930 basic_block bb;
931
932 gcc_checking_assert (INSN_P (insn));
933
934 if (!df)
935 return;
936
937 uid = INSN_UID (insn);
938 bb = BLOCK_FOR_INSN (insn);
939
940 /* ??? bb can be NULL after pass_free_cfg. At that point, DF should
941 not exist anymore (as mentioned in df-core.c: "The only requirement
942 [for DF] is that there be a correct control flow graph." Clearly
943 that isn't the case after pass_free_cfg. But DF is freed much later
944 because some back-ends want to use DF info even though the CFG is
945 already gone. It's not clear to me whether that is safe, actually.
946 In any case, we expect BB to be non-NULL at least up to register
947 allocation, so disallow a non-NULL BB up to there. Not perfect
948 but better than nothing... */
949 gcc_checking_assert (bb != NULL || reload_completed);
950
951 df_grow_bb_info (df_scan);
952 df_grow_reg_info ();
953
954 /* The block must be marked as dirty now, rather than later as in
955 df_insn_rescan and df_notes_rescan because it may not be there at
956 rescanning time and the mark would blow up.
957 DEBUG_INSNs do not make a block's data flow solution dirty (at
958 worst the LUIDs are no longer contiguous). */
959 if (bb != NULL && NONDEBUG_INSN_P (insn))
960 df_set_bb_dirty (bb);
961
962 /* The client has deferred rescanning. */
963 if (df->changeable_flags & DF_DEFER_INSN_RESCAN)
964 {
965 struct df_insn_info *insn_info = DF_INSN_UID_SAFE_GET (uid);
966 if (insn_info)
967 {
968 bitmap_clear_bit (&df->insns_to_rescan, uid);
969 bitmap_clear_bit (&df->insns_to_notes_rescan, uid);
970 bitmap_set_bit (&df->insns_to_delete, uid);
971 }
972 if (dump_file)
973 fprintf (dump_file, "deferring deletion of insn with uid = %d.\n", uid);
974 return;
975 }
976
977 if (dump_file)
978 fprintf (dump_file, "deleting insn with uid = %d.\n", uid);
979
980 df_insn_info_delete (uid);
981 }
982
983
984 /* Free all of the refs and the mw_hardregs in COLLECTION_REC. */
985
986 static void
df_free_collection_rec(class df_collection_rec * collection_rec)987 df_free_collection_rec (class df_collection_rec *collection_rec)
988 {
989 unsigned int ix;
990 struct df_scan_problem_data *problem_data
991 = (struct df_scan_problem_data *) df_scan->problem_data;
992 df_ref ref;
993 struct df_mw_hardreg *mw;
994
995 FOR_EACH_VEC_ELT (collection_rec->def_vec, ix, ref)
996 df_free_ref (ref);
997 FOR_EACH_VEC_ELT (collection_rec->use_vec, ix, ref)
998 df_free_ref (ref);
999 FOR_EACH_VEC_ELT (collection_rec->eq_use_vec, ix, ref)
1000 df_free_ref (ref);
1001 FOR_EACH_VEC_ELT (collection_rec->mw_vec, ix, mw)
1002 problem_data->mw_reg_pool->remove (mw);
1003
1004 collection_rec->def_vec.release ();
1005 collection_rec->use_vec.release ();
1006 collection_rec->eq_use_vec.release ();
1007 collection_rec->mw_vec.release ();
1008 }
1009
1010 /* Rescan INSN. Return TRUE if the rescanning produced any changes. */
1011
1012 bool
df_insn_rescan(rtx_insn * insn)1013 df_insn_rescan (rtx_insn *insn)
1014 {
1015 unsigned int uid = INSN_UID (insn);
1016 struct df_insn_info *insn_info = NULL;
1017 basic_block bb = BLOCK_FOR_INSN (insn);
1018 class df_collection_rec collection_rec;
1019
1020 if ((!df) || (!INSN_P (insn)))
1021 return false;
1022
1023 if (!bb)
1024 {
1025 if (dump_file)
1026 fprintf (dump_file, "no bb for insn with uid = %d.\n", uid);
1027 return false;
1028 }
1029
1030 /* The client has disabled rescanning and plans to do it itself. */
1031 if (df->changeable_flags & DF_NO_INSN_RESCAN)
1032 return false;
1033
1034 df_grow_bb_info (df_scan);
1035 df_grow_reg_info ();
1036
1037 insn_info = DF_INSN_UID_SAFE_GET (uid);
1038
1039 /* The client has deferred rescanning. */
1040 if (df->changeable_flags & DF_DEFER_INSN_RESCAN)
1041 {
1042 if (!insn_info)
1043 {
1044 insn_info = df_insn_create_insn_record (insn);
1045 insn_info->defs = 0;
1046 insn_info->uses = 0;
1047 insn_info->eq_uses = 0;
1048 insn_info->mw_hardregs = 0;
1049 }
1050 if (dump_file)
1051 fprintf (dump_file, "deferring rescan insn with uid = %d.\n", uid);
1052
1053 bitmap_clear_bit (&df->insns_to_delete, uid);
1054 bitmap_clear_bit (&df->insns_to_notes_rescan, uid);
1055 bitmap_set_bit (&df->insns_to_rescan, INSN_UID (insn));
1056 return false;
1057 }
1058
1059 bitmap_clear_bit (&df->insns_to_delete, uid);
1060 bitmap_clear_bit (&df->insns_to_rescan, uid);
1061 bitmap_clear_bit (&df->insns_to_notes_rescan, uid);
1062 if (insn_info)
1063 {
1064 int luid;
1065 bool the_same = df_insn_refs_verify (&collection_rec, bb, insn, false);
1066 /* If there's no change, return false. */
1067 if (the_same)
1068 {
1069 df_free_collection_rec (&collection_rec);
1070 if (dump_file)
1071 fprintf (dump_file, "verify found no changes in insn with uid = %d.\n", uid);
1072 return false;
1073 }
1074 if (dump_file)
1075 fprintf (dump_file, "rescanning insn with uid = %d.\n", uid);
1076
1077 /* There's change - we need to delete the existing info.
1078 Since the insn isn't moved, we can salvage its LUID. */
1079 luid = DF_INSN_LUID (insn);
1080 df_insn_info_free_fields (insn_info);
1081 df_insn_info_init_fields (insn_info, insn);
1082 DF_INSN_LUID (insn) = luid;
1083 }
1084 else
1085 {
1086 struct df_insn_info *insn_info = df_insn_create_insn_record (insn);
1087 df_insn_refs_collect (&collection_rec, bb, insn_info);
1088 if (dump_file)
1089 fprintf (dump_file, "scanning new insn with uid = %d.\n", uid);
1090 }
1091
1092 df_refs_add_to_chains (&collection_rec, bb, insn, copy_all);
1093 if (!DEBUG_INSN_P (insn))
1094 df_set_bb_dirty (bb);
1095
1096 return true;
1097 }
1098
1099 /* Same as df_insn_rescan, but don't mark the basic block as
1100 dirty. */
1101
1102 bool
df_insn_rescan_debug_internal(rtx_insn * insn)1103 df_insn_rescan_debug_internal (rtx_insn *insn)
1104 {
1105 unsigned int uid = INSN_UID (insn);
1106 struct df_insn_info *insn_info;
1107
1108 gcc_assert (DEBUG_INSN_P (insn)
1109 && VAR_LOC_UNKNOWN_P (INSN_VAR_LOCATION_LOC (insn)));
1110
1111 if (!df)
1112 return false;
1113
1114 insn_info = DF_INSN_UID_SAFE_GET (INSN_UID (insn));
1115 if (!insn_info)
1116 return false;
1117
1118 if (dump_file)
1119 fprintf (dump_file, "deleting debug_insn with uid = %d.\n", uid);
1120
1121 bitmap_clear_bit (&df->insns_to_delete, uid);
1122 bitmap_clear_bit (&df->insns_to_rescan, uid);
1123 bitmap_clear_bit (&df->insns_to_notes_rescan, uid);
1124
1125 if (insn_info->defs == 0
1126 && insn_info->uses == 0
1127 && insn_info->eq_uses == 0
1128 && insn_info->mw_hardregs == 0)
1129 return false;
1130
1131 df_mw_hardreg_chain_delete (insn_info->mw_hardregs);
1132
1133 if (df_chain)
1134 {
1135 df_ref_chain_delete_du_chain (insn_info->defs);
1136 df_ref_chain_delete_du_chain (insn_info->uses);
1137 df_ref_chain_delete_du_chain (insn_info->eq_uses);
1138 }
1139
1140 df_ref_chain_delete (insn_info->defs);
1141 df_ref_chain_delete (insn_info->uses);
1142 df_ref_chain_delete (insn_info->eq_uses);
1143
1144 insn_info->defs = 0;
1145 insn_info->uses = 0;
1146 insn_info->eq_uses = 0;
1147 insn_info->mw_hardregs = 0;
1148
1149 return true;
1150 }
1151
1152
1153 /* Rescan all of the insns in the function. Note that the artificial
1154 uses and defs are not touched. This function will destroy def-use
1155 or use-def chains. */
1156
1157 void
df_insn_rescan_all(void)1158 df_insn_rescan_all (void)
1159 {
1160 bool no_insn_rescan = false;
1161 bool defer_insn_rescan = false;
1162 basic_block bb;
1163 bitmap_iterator bi;
1164 unsigned int uid;
1165
1166 if (df->changeable_flags & DF_NO_INSN_RESCAN)
1167 {
1168 df_clear_flags (DF_NO_INSN_RESCAN);
1169 no_insn_rescan = true;
1170 }
1171
1172 if (df->changeable_flags & DF_DEFER_INSN_RESCAN)
1173 {
1174 df_clear_flags (DF_DEFER_INSN_RESCAN);
1175 defer_insn_rescan = true;
1176 }
1177
1178 auto_bitmap tmp (&df_bitmap_obstack);
1179 bitmap_copy (tmp, &df->insns_to_delete);
1180 EXECUTE_IF_SET_IN_BITMAP (tmp, 0, uid, bi)
1181 {
1182 struct df_insn_info *insn_info = DF_INSN_UID_SAFE_GET (uid);
1183 if (insn_info)
1184 df_insn_info_delete (uid);
1185 }
1186
1187 bitmap_clear (&df->insns_to_delete);
1188 bitmap_clear (&df->insns_to_rescan);
1189 bitmap_clear (&df->insns_to_notes_rescan);
1190
1191 FOR_EACH_BB_FN (bb, cfun)
1192 {
1193 rtx_insn *insn;
1194 FOR_BB_INSNS (bb, insn)
1195 {
1196 df_insn_rescan (insn);
1197 }
1198 }
1199
1200 if (no_insn_rescan)
1201 df_set_flags (DF_NO_INSN_RESCAN);
1202 if (defer_insn_rescan)
1203 df_set_flags (DF_DEFER_INSN_RESCAN);
1204 }
1205
1206
1207 /* Process all of the deferred rescans or deletions. */
1208
1209 void
df_process_deferred_rescans(void)1210 df_process_deferred_rescans (void)
1211 {
1212 bool no_insn_rescan = false;
1213 bool defer_insn_rescan = false;
1214 bitmap_iterator bi;
1215 unsigned int uid;
1216
1217 if (df->changeable_flags & DF_NO_INSN_RESCAN)
1218 {
1219 df_clear_flags (DF_NO_INSN_RESCAN);
1220 no_insn_rescan = true;
1221 }
1222
1223 if (df->changeable_flags & DF_DEFER_INSN_RESCAN)
1224 {
1225 df_clear_flags (DF_DEFER_INSN_RESCAN);
1226 defer_insn_rescan = true;
1227 }
1228
1229 if (dump_file)
1230 fprintf (dump_file, "starting the processing of deferred insns\n");
1231
1232 auto_bitmap tmp (&df_bitmap_obstack);
1233 bitmap_copy (tmp, &df->insns_to_delete);
1234 EXECUTE_IF_SET_IN_BITMAP (tmp, 0, uid, bi)
1235 {
1236 struct df_insn_info *insn_info = DF_INSN_UID_SAFE_GET (uid);
1237 if (insn_info)
1238 df_insn_info_delete (uid);
1239 }
1240
1241 bitmap_copy (tmp, &df->insns_to_rescan);
1242 EXECUTE_IF_SET_IN_BITMAP (tmp, 0, uid, bi)
1243 {
1244 struct df_insn_info *insn_info = DF_INSN_UID_SAFE_GET (uid);
1245 if (insn_info)
1246 df_insn_rescan (insn_info->insn);
1247 }
1248
1249 bitmap_copy (tmp, &df->insns_to_notes_rescan);
1250 EXECUTE_IF_SET_IN_BITMAP (tmp, 0, uid, bi)
1251 {
1252 struct df_insn_info *insn_info = DF_INSN_UID_SAFE_GET (uid);
1253 if (insn_info)
1254 df_notes_rescan (insn_info->insn);
1255 }
1256
1257 if (dump_file)
1258 fprintf (dump_file, "ending the processing of deferred insns\n");
1259
1260 bitmap_clear (&df->insns_to_delete);
1261 bitmap_clear (&df->insns_to_rescan);
1262 bitmap_clear (&df->insns_to_notes_rescan);
1263
1264 if (no_insn_rescan)
1265 df_set_flags (DF_NO_INSN_RESCAN);
1266 if (defer_insn_rescan)
1267 df_set_flags (DF_DEFER_INSN_RESCAN);
1268
1269 /* If someone changed regs_ever_live during this pass, fix up the
1270 entry and exit blocks. */
1271 if (df->redo_entry_and_exit)
1272 {
1273 df_update_entry_exit_and_calls ();
1274 df->redo_entry_and_exit = false;
1275 }
1276 }
1277
1278
1279 /* Count the number of refs. Include the defs if INCLUDE_DEFS. Include
1280 the uses if INCLUDE_USES. Include the eq_uses if
1281 INCLUDE_EQ_USES. */
1282
1283 static unsigned int
df_count_refs(bool include_defs,bool include_uses,bool include_eq_uses)1284 df_count_refs (bool include_defs, bool include_uses,
1285 bool include_eq_uses)
1286 {
1287 unsigned int regno;
1288 int size = 0;
1289 unsigned int m = df->regs_inited;
1290
1291 for (regno = 0; regno < m; regno++)
1292 {
1293 if (include_defs)
1294 size += DF_REG_DEF_COUNT (regno);
1295 if (include_uses)
1296 size += DF_REG_USE_COUNT (regno);
1297 if (include_eq_uses)
1298 size += DF_REG_EQ_USE_COUNT (regno);
1299 }
1300 return size;
1301 }
1302
1303
1304 /* Take build ref table for either the uses or defs from the reg-use
1305 or reg-def chains. This version processes the refs in reg order
1306 which is likely to be best if processing the whole function. */
1307
1308 static void
df_reorganize_refs_by_reg_by_reg(struct df_ref_info * ref_info,bool include_defs,bool include_uses,bool include_eq_uses)1309 df_reorganize_refs_by_reg_by_reg (struct df_ref_info *ref_info,
1310 bool include_defs,
1311 bool include_uses,
1312 bool include_eq_uses)
1313 {
1314 unsigned int m = df->regs_inited;
1315 unsigned int regno;
1316 unsigned int offset = 0;
1317 unsigned int start;
1318
1319 if (df->changeable_flags & DF_NO_HARD_REGS)
1320 {
1321 start = FIRST_PSEUDO_REGISTER;
1322 memset (ref_info->begin, 0, sizeof (int) * FIRST_PSEUDO_REGISTER);
1323 memset (ref_info->count, 0, sizeof (int) * FIRST_PSEUDO_REGISTER);
1324 }
1325 else
1326 start = 0;
1327
1328 ref_info->total_size
1329 = df_count_refs (include_defs, include_uses, include_eq_uses);
1330
1331 df_check_and_grow_ref_info (ref_info, 1);
1332
1333 for (regno = start; regno < m; regno++)
1334 {
1335 int count = 0;
1336 ref_info->begin[regno] = offset;
1337 if (include_defs)
1338 {
1339 df_ref ref = DF_REG_DEF_CHAIN (regno);
1340 while (ref)
1341 {
1342 ref_info->refs[offset] = ref;
1343 DF_REF_ID (ref) = offset++;
1344 count++;
1345 ref = DF_REF_NEXT_REG (ref);
1346 gcc_checking_assert (offset < ref_info->refs_size);
1347 }
1348 }
1349 if (include_uses)
1350 {
1351 df_ref ref = DF_REG_USE_CHAIN (regno);
1352 while (ref)
1353 {
1354 ref_info->refs[offset] = ref;
1355 DF_REF_ID (ref) = offset++;
1356 count++;
1357 ref = DF_REF_NEXT_REG (ref);
1358 gcc_checking_assert (offset < ref_info->refs_size);
1359 }
1360 }
1361 if (include_eq_uses)
1362 {
1363 df_ref ref = DF_REG_EQ_USE_CHAIN (regno);
1364 while (ref)
1365 {
1366 ref_info->refs[offset] = ref;
1367 DF_REF_ID (ref) = offset++;
1368 count++;
1369 ref = DF_REF_NEXT_REG (ref);
1370 gcc_checking_assert (offset < ref_info->refs_size);
1371 }
1372 }
1373 ref_info->count[regno] = count;
1374 }
1375
1376 /* The bitmap size is not decremented when refs are deleted. So
1377 reset it now that we have squished out all of the empty
1378 slots. */
1379 ref_info->table_size = offset;
1380 }
1381
1382
1383 /* Take build ref table for either the uses or defs from the reg-use
1384 or reg-def chains. This version processes the refs in insn order
1385 which is likely to be best if processing some segment of the
1386 function. */
1387
1388 static void
df_reorganize_refs_by_reg_by_insn(struct df_ref_info * ref_info,bool include_defs,bool include_uses,bool include_eq_uses)1389 df_reorganize_refs_by_reg_by_insn (struct df_ref_info *ref_info,
1390 bool include_defs,
1391 bool include_uses,
1392 bool include_eq_uses)
1393 {
1394 bitmap_iterator bi;
1395 unsigned int bb_index;
1396 unsigned int m = df->regs_inited;
1397 unsigned int offset = 0;
1398 unsigned int r;
1399 unsigned int start
1400 = (df->changeable_flags & DF_NO_HARD_REGS) ? FIRST_PSEUDO_REGISTER : 0;
1401
1402 memset (ref_info->begin, 0, sizeof (int) * df->regs_inited);
1403 memset (ref_info->count, 0, sizeof (int) * df->regs_inited);
1404
1405 ref_info->total_size = df_count_refs (include_defs, include_uses, include_eq_uses);
1406 df_check_and_grow_ref_info (ref_info, 1);
1407
1408 EXECUTE_IF_SET_IN_BITMAP (df->blocks_to_analyze, 0, bb_index, bi)
1409 {
1410 basic_block bb = BASIC_BLOCK_FOR_FN (cfun, bb_index);
1411 rtx_insn *insn;
1412 df_ref def, use;
1413
1414 if (include_defs)
1415 FOR_EACH_ARTIFICIAL_DEF (def, bb_index)
1416 {
1417 unsigned int regno = DF_REF_REGNO (def);
1418 ref_info->count[regno]++;
1419 }
1420 if (include_uses)
1421 FOR_EACH_ARTIFICIAL_USE (use, bb_index)
1422 {
1423 unsigned int regno = DF_REF_REGNO (use);
1424 ref_info->count[regno]++;
1425 }
1426
1427 FOR_BB_INSNS (bb, insn)
1428 {
1429 if (INSN_P (insn))
1430 {
1431 struct df_insn_info *insn_info = DF_INSN_INFO_GET (insn);
1432
1433 if (include_defs)
1434 FOR_EACH_INSN_INFO_DEF (def, insn_info)
1435 {
1436 unsigned int regno = DF_REF_REGNO (def);
1437 ref_info->count[regno]++;
1438 }
1439 if (include_uses)
1440 FOR_EACH_INSN_INFO_USE (use, insn_info)
1441 {
1442 unsigned int regno = DF_REF_REGNO (use);
1443 ref_info->count[regno]++;
1444 }
1445 if (include_eq_uses)
1446 FOR_EACH_INSN_INFO_EQ_USE (use, insn_info)
1447 {
1448 unsigned int regno = DF_REF_REGNO (use);
1449 ref_info->count[regno]++;
1450 }
1451 }
1452 }
1453 }
1454
1455 for (r = start; r < m; r++)
1456 {
1457 ref_info->begin[r] = offset;
1458 offset += ref_info->count[r];
1459 ref_info->count[r] = 0;
1460 }
1461
1462 EXECUTE_IF_SET_IN_BITMAP (df->blocks_to_analyze, 0, bb_index, bi)
1463 {
1464 basic_block bb = BASIC_BLOCK_FOR_FN (cfun, bb_index);
1465 rtx_insn *insn;
1466 df_ref def, use;
1467
1468 if (include_defs)
1469 FOR_EACH_ARTIFICIAL_DEF (def, bb_index)
1470 {
1471 unsigned int regno = DF_REF_REGNO (def);
1472 if (regno >= start)
1473 {
1474 unsigned int id
1475 = ref_info->begin[regno] + ref_info->count[regno]++;
1476 DF_REF_ID (def) = id;
1477 ref_info->refs[id] = def;
1478 }
1479 }
1480 if (include_uses)
1481 FOR_EACH_ARTIFICIAL_USE (use, bb_index)
1482 {
1483 unsigned int regno = DF_REF_REGNO (def);
1484 if (regno >= start)
1485 {
1486 unsigned int id
1487 = ref_info->begin[regno] + ref_info->count[regno]++;
1488 DF_REF_ID (use) = id;
1489 ref_info->refs[id] = use;
1490 }
1491 }
1492
1493 FOR_BB_INSNS (bb, insn)
1494 {
1495 if (INSN_P (insn))
1496 {
1497 struct df_insn_info *insn_info = DF_INSN_INFO_GET (insn);
1498
1499 if (include_defs)
1500 FOR_EACH_INSN_INFO_DEF (def, insn_info)
1501 {
1502 unsigned int regno = DF_REF_REGNO (def);
1503 if (regno >= start)
1504 {
1505 unsigned int id
1506 = ref_info->begin[regno] + ref_info->count[regno]++;
1507 DF_REF_ID (def) = id;
1508 ref_info->refs[id] = def;
1509 }
1510 }
1511 if (include_uses)
1512 FOR_EACH_INSN_INFO_USE (use, insn_info)
1513 {
1514 unsigned int regno = DF_REF_REGNO (use);
1515 if (regno >= start)
1516 {
1517 unsigned int id
1518 = ref_info->begin[regno] + ref_info->count[regno]++;
1519 DF_REF_ID (use) = id;
1520 ref_info->refs[id] = use;
1521 }
1522 }
1523 if (include_eq_uses)
1524 FOR_EACH_INSN_INFO_EQ_USE (use, insn_info)
1525 {
1526 unsigned int regno = DF_REF_REGNO (use);
1527 if (regno >= start)
1528 {
1529 unsigned int id
1530 = ref_info->begin[regno] + ref_info->count[regno]++;
1531 DF_REF_ID (use) = id;
1532 ref_info->refs[id] = use;
1533 }
1534 }
1535 }
1536 }
1537 }
1538
1539 /* The bitmap size is not decremented when refs are deleted. So
1540 reset it now that we have squished out all of the empty
1541 slots. */
1542
1543 ref_info->table_size = offset;
1544 }
1545
1546 /* Take build ref table for either the uses or defs from the reg-use
1547 or reg-def chains. */
1548
1549 static void
df_reorganize_refs_by_reg(struct df_ref_info * ref_info,bool include_defs,bool include_uses,bool include_eq_uses)1550 df_reorganize_refs_by_reg (struct df_ref_info *ref_info,
1551 bool include_defs,
1552 bool include_uses,
1553 bool include_eq_uses)
1554 {
1555 if (df->analyze_subset)
1556 df_reorganize_refs_by_reg_by_insn (ref_info, include_defs,
1557 include_uses, include_eq_uses);
1558 else
1559 df_reorganize_refs_by_reg_by_reg (ref_info, include_defs,
1560 include_uses, include_eq_uses);
1561 }
1562
1563
1564 /* Add the refs in REF_VEC to the table in REF_INFO starting at OFFSET. */
1565 static unsigned int
df_add_refs_to_table(unsigned int offset,struct df_ref_info * ref_info,df_ref ref)1566 df_add_refs_to_table (unsigned int offset,
1567 struct df_ref_info *ref_info,
1568 df_ref ref)
1569 {
1570 for (; ref; ref = DF_REF_NEXT_LOC (ref))
1571 if (!(df->changeable_flags & DF_NO_HARD_REGS)
1572 || (DF_REF_REGNO (ref) >= FIRST_PSEUDO_REGISTER))
1573 {
1574 ref_info->refs[offset] = ref;
1575 DF_REF_ID (ref) = offset++;
1576 }
1577 return offset;
1578 }
1579
1580
1581 /* Count the number of refs in all of the insns of BB. Include the
1582 defs if INCLUDE_DEFS. Include the uses if INCLUDE_USES. Include the
1583 eq_uses if INCLUDE_EQ_USES. */
1584
1585 static unsigned int
df_reorganize_refs_by_insn_bb(basic_block bb,unsigned int offset,struct df_ref_info * ref_info,bool include_defs,bool include_uses,bool include_eq_uses)1586 df_reorganize_refs_by_insn_bb (basic_block bb, unsigned int offset,
1587 struct df_ref_info *ref_info,
1588 bool include_defs, bool include_uses,
1589 bool include_eq_uses)
1590 {
1591 rtx_insn *insn;
1592
1593 if (include_defs)
1594 offset = df_add_refs_to_table (offset, ref_info,
1595 df_get_artificial_defs (bb->index));
1596 if (include_uses)
1597 offset = df_add_refs_to_table (offset, ref_info,
1598 df_get_artificial_uses (bb->index));
1599
1600 FOR_BB_INSNS (bb, insn)
1601 if (INSN_P (insn))
1602 {
1603 unsigned int uid = INSN_UID (insn);
1604 if (include_defs)
1605 offset = df_add_refs_to_table (offset, ref_info,
1606 DF_INSN_UID_DEFS (uid));
1607 if (include_uses)
1608 offset = df_add_refs_to_table (offset, ref_info,
1609 DF_INSN_UID_USES (uid));
1610 if (include_eq_uses)
1611 offset = df_add_refs_to_table (offset, ref_info,
1612 DF_INSN_UID_EQ_USES (uid));
1613 }
1614 return offset;
1615 }
1616
1617
1618 /* Organize the refs by insn into the table in REF_INFO. If
1619 blocks_to_analyze is defined, use that set, otherwise the entire
1620 program. Include the defs if INCLUDE_DEFS. Include the uses if
1621 INCLUDE_USES. Include the eq_uses if INCLUDE_EQ_USES. */
1622
1623 static void
df_reorganize_refs_by_insn(struct df_ref_info * ref_info,bool include_defs,bool include_uses,bool include_eq_uses)1624 df_reorganize_refs_by_insn (struct df_ref_info *ref_info,
1625 bool include_defs, bool include_uses,
1626 bool include_eq_uses)
1627 {
1628 basic_block bb;
1629 unsigned int offset = 0;
1630
1631 ref_info->total_size = df_count_refs (include_defs, include_uses, include_eq_uses);
1632 df_check_and_grow_ref_info (ref_info, 1);
1633 if (df->blocks_to_analyze)
1634 {
1635 bitmap_iterator bi;
1636 unsigned int index;
1637
1638 EXECUTE_IF_SET_IN_BITMAP (df->blocks_to_analyze, 0, index, bi)
1639 {
1640 offset = df_reorganize_refs_by_insn_bb (BASIC_BLOCK_FOR_FN (cfun,
1641 index),
1642 offset, ref_info,
1643 include_defs, include_uses,
1644 include_eq_uses);
1645 }
1646
1647 ref_info->table_size = offset;
1648 }
1649 else
1650 {
1651 FOR_ALL_BB_FN (bb, cfun)
1652 offset = df_reorganize_refs_by_insn_bb (bb, offset, ref_info,
1653 include_defs, include_uses,
1654 include_eq_uses);
1655 ref_info->table_size = offset;
1656 }
1657 }
1658
1659
1660 /* If the use refs in DF are not organized, reorganize them. */
1661
1662 void
df_maybe_reorganize_use_refs(enum df_ref_order order)1663 df_maybe_reorganize_use_refs (enum df_ref_order order)
1664 {
1665 if (order == df->use_info.ref_order)
1666 return;
1667
1668 switch (order)
1669 {
1670 case DF_REF_ORDER_BY_REG:
1671 df_reorganize_refs_by_reg (&df->use_info, false, true, false);
1672 break;
1673
1674 case DF_REF_ORDER_BY_REG_WITH_NOTES:
1675 df_reorganize_refs_by_reg (&df->use_info, false, true, true);
1676 break;
1677
1678 case DF_REF_ORDER_BY_INSN:
1679 df_reorganize_refs_by_insn (&df->use_info, false, true, false);
1680 break;
1681
1682 case DF_REF_ORDER_BY_INSN_WITH_NOTES:
1683 df_reorganize_refs_by_insn (&df->use_info, false, true, true);
1684 break;
1685
1686 case DF_REF_ORDER_NO_TABLE:
1687 free (df->use_info.refs);
1688 df->use_info.refs = NULL;
1689 df->use_info.refs_size = 0;
1690 break;
1691
1692 case DF_REF_ORDER_UNORDERED:
1693 case DF_REF_ORDER_UNORDERED_WITH_NOTES:
1694 gcc_unreachable ();
1695 break;
1696 }
1697
1698 df->use_info.ref_order = order;
1699 }
1700
1701
1702 /* If the def refs in DF are not organized, reorganize them. */
1703
1704 void
df_maybe_reorganize_def_refs(enum df_ref_order order)1705 df_maybe_reorganize_def_refs (enum df_ref_order order)
1706 {
1707 if (order == df->def_info.ref_order)
1708 return;
1709
1710 switch (order)
1711 {
1712 case DF_REF_ORDER_BY_REG:
1713 df_reorganize_refs_by_reg (&df->def_info, true, false, false);
1714 break;
1715
1716 case DF_REF_ORDER_BY_INSN:
1717 df_reorganize_refs_by_insn (&df->def_info, true, false, false);
1718 break;
1719
1720 case DF_REF_ORDER_NO_TABLE:
1721 free (df->def_info.refs);
1722 df->def_info.refs = NULL;
1723 df->def_info.refs_size = 0;
1724 break;
1725
1726 case DF_REF_ORDER_BY_INSN_WITH_NOTES:
1727 case DF_REF_ORDER_BY_REG_WITH_NOTES:
1728 case DF_REF_ORDER_UNORDERED:
1729 case DF_REF_ORDER_UNORDERED_WITH_NOTES:
1730 gcc_unreachable ();
1731 break;
1732 }
1733
1734 df->def_info.ref_order = order;
1735 }
1736
1737
1738 /* Change all of the basic block references in INSN to use the insn's
1739 current basic block. This function is called from routines that move
1740 instructions from one block to another. */
1741
1742 void
df_insn_change_bb(rtx_insn * insn,basic_block new_bb)1743 df_insn_change_bb (rtx_insn *insn, basic_block new_bb)
1744 {
1745 basic_block old_bb = BLOCK_FOR_INSN (insn);
1746 struct df_insn_info *insn_info;
1747 unsigned int uid = INSN_UID (insn);
1748
1749 if (old_bb == new_bb)
1750 return;
1751
1752 set_block_for_insn (insn, new_bb);
1753
1754 if (!df)
1755 return;
1756
1757 if (dump_file)
1758 fprintf (dump_file, "changing bb of uid %d\n", uid);
1759
1760 insn_info = DF_INSN_UID_SAFE_GET (uid);
1761 if (insn_info == NULL)
1762 {
1763 if (dump_file)
1764 fprintf (dump_file, " unscanned insn\n");
1765 df_insn_rescan (insn);
1766 return;
1767 }
1768
1769 if (!INSN_P (insn))
1770 return;
1771
1772 df_set_bb_dirty (new_bb);
1773 if (old_bb)
1774 {
1775 if (dump_file)
1776 fprintf (dump_file, " from %d to %d\n",
1777 old_bb->index, new_bb->index);
1778 df_set_bb_dirty (old_bb);
1779 }
1780 else
1781 if (dump_file)
1782 fprintf (dump_file, " to %d\n", new_bb->index);
1783 }
1784
1785
1786 /* Helper function for df_ref_change_reg_with_loc. */
1787
1788 static void
df_ref_change_reg_with_loc_1(struct df_reg_info * old_df,struct df_reg_info * new_df,unsigned int new_regno,rtx loc)1789 df_ref_change_reg_with_loc_1 (struct df_reg_info *old_df,
1790 struct df_reg_info *new_df,
1791 unsigned int new_regno, rtx loc)
1792 {
1793 df_ref the_ref = old_df->reg_chain;
1794
1795 while (the_ref)
1796 {
1797 if ((!DF_REF_IS_ARTIFICIAL (the_ref))
1798 && DF_REF_LOC (the_ref)
1799 && (*DF_REF_LOC (the_ref) == loc))
1800 {
1801 df_ref next_ref = DF_REF_NEXT_REG (the_ref);
1802 df_ref prev_ref = DF_REF_PREV_REG (the_ref);
1803 df_ref *ref_ptr;
1804 struct df_insn_info *insn_info = DF_REF_INSN_INFO (the_ref);
1805
1806 DF_REF_REGNO (the_ref) = new_regno;
1807 DF_REF_REG (the_ref) = regno_reg_rtx[new_regno];
1808
1809 /* Pull the_ref out of the old regno chain. */
1810 if (prev_ref)
1811 DF_REF_NEXT_REG (prev_ref) = next_ref;
1812 else
1813 old_df->reg_chain = next_ref;
1814 if (next_ref)
1815 DF_REF_PREV_REG (next_ref) = prev_ref;
1816 old_df->n_refs--;
1817
1818 /* Put the ref into the new regno chain. */
1819 DF_REF_PREV_REG (the_ref) = NULL;
1820 DF_REF_NEXT_REG (the_ref) = new_df->reg_chain;
1821 if (new_df->reg_chain)
1822 DF_REF_PREV_REG (new_df->reg_chain) = the_ref;
1823 new_df->reg_chain = the_ref;
1824 new_df->n_refs++;
1825 if (DF_REF_BB (the_ref))
1826 df_set_bb_dirty (DF_REF_BB (the_ref));
1827
1828 /* Need to sort the record again that the ref was in because
1829 the regno is a sorting key. First, find the right
1830 record. */
1831 if (DF_REF_REG_DEF_P (the_ref))
1832 ref_ptr = &insn_info->defs;
1833 else if (DF_REF_FLAGS (the_ref) & DF_REF_IN_NOTE)
1834 ref_ptr = &insn_info->eq_uses;
1835 else
1836 ref_ptr = &insn_info->uses;
1837 if (dump_file)
1838 fprintf (dump_file, "changing reg in insn %d\n",
1839 DF_REF_INSN_UID (the_ref));
1840
1841 /* Stop if we find the current reference or where the reference
1842 needs to be. */
1843 while (*ref_ptr != the_ref && df_ref_compare (*ref_ptr, the_ref) < 0)
1844 ref_ptr = &DF_REF_NEXT_LOC (*ref_ptr);
1845 if (*ref_ptr != the_ref)
1846 {
1847 /* The reference needs to be promoted up the list. */
1848 df_ref next = DF_REF_NEXT_LOC (the_ref);
1849 DF_REF_NEXT_LOC (the_ref) = *ref_ptr;
1850 *ref_ptr = the_ref;
1851 do
1852 ref_ptr = &DF_REF_NEXT_LOC (*ref_ptr);
1853 while (*ref_ptr != the_ref);
1854 *ref_ptr = next;
1855 }
1856 else if (DF_REF_NEXT_LOC (the_ref)
1857 && df_ref_compare (the_ref, DF_REF_NEXT_LOC (the_ref)) > 0)
1858 {
1859 /* The reference needs to be demoted down the list. */
1860 *ref_ptr = DF_REF_NEXT_LOC (the_ref);
1861 do
1862 ref_ptr = &DF_REF_NEXT_LOC (*ref_ptr);
1863 while (*ref_ptr && df_ref_compare (the_ref, *ref_ptr) > 0);
1864 DF_REF_NEXT_LOC (the_ref) = *ref_ptr;
1865 *ref_ptr = the_ref;
1866 }
1867
1868 the_ref = next_ref;
1869 }
1870 else
1871 the_ref = DF_REF_NEXT_REG (the_ref);
1872 }
1873 }
1874
1875
1876 /* Change the regno of register LOC to NEW_REGNO and update the df
1877 information accordingly. Refs that do not match LOC are not changed
1878 which means that artificial refs are not changed since they have no loc.
1879 This call is to support the SET_REGNO macro. */
1880
1881 void
df_ref_change_reg_with_loc(rtx loc,unsigned int new_regno)1882 df_ref_change_reg_with_loc (rtx loc, unsigned int new_regno)
1883 {
1884 unsigned int old_regno = REGNO (loc);
1885 if (old_regno == new_regno)
1886 return;
1887
1888 if (df)
1889 {
1890 df_grow_reg_info ();
1891
1892 df_ref_change_reg_with_loc_1 (DF_REG_DEF_GET (old_regno),
1893 DF_REG_DEF_GET (new_regno),
1894 new_regno, loc);
1895 df_ref_change_reg_with_loc_1 (DF_REG_USE_GET (old_regno),
1896 DF_REG_USE_GET (new_regno),
1897 new_regno, loc);
1898 df_ref_change_reg_with_loc_1 (DF_REG_EQ_USE_GET (old_regno),
1899 DF_REG_EQ_USE_GET (new_regno),
1900 new_regno, loc);
1901 }
1902 set_mode_and_regno (loc, GET_MODE (loc), new_regno);
1903 }
1904
1905
1906 /* Delete the mw_hardregs that point into the eq_notes. */
1907
1908 static void
df_mw_hardreg_chain_delete_eq_uses(struct df_insn_info * insn_info)1909 df_mw_hardreg_chain_delete_eq_uses (struct df_insn_info *insn_info)
1910 {
1911 struct df_mw_hardreg **mw_ptr = &insn_info->mw_hardregs;
1912 struct df_scan_problem_data *problem_data
1913 = (struct df_scan_problem_data *) df_scan->problem_data;
1914
1915 while (*mw_ptr)
1916 {
1917 df_mw_hardreg *mw = *mw_ptr;
1918 if (mw->flags & DF_REF_IN_NOTE)
1919 {
1920 *mw_ptr = DF_MWS_NEXT (mw);
1921 problem_data->mw_reg_pool->remove (mw);
1922 }
1923 else
1924 mw_ptr = &DF_MWS_NEXT (mw);
1925 }
1926 }
1927
1928
1929 /* Rescan only the REG_EQUIV/REG_EQUAL notes part of INSN. */
1930
1931 void
df_notes_rescan(rtx_insn * insn)1932 df_notes_rescan (rtx_insn *insn)
1933 {
1934 struct df_insn_info *insn_info;
1935 unsigned int uid = INSN_UID (insn);
1936
1937 if (!df)
1938 return;
1939
1940 /* The client has disabled rescanning and plans to do it itself. */
1941 if (df->changeable_flags & DF_NO_INSN_RESCAN)
1942 return;
1943
1944 /* Do nothing if the insn hasn't been emitted yet. */
1945 if (!BLOCK_FOR_INSN (insn))
1946 return;
1947
1948 df_grow_bb_info (df_scan);
1949 df_grow_reg_info ();
1950
1951 insn_info = DF_INSN_UID_SAFE_GET (INSN_UID (insn));
1952
1953 /* The client has deferred rescanning. */
1954 if (df->changeable_flags & DF_DEFER_INSN_RESCAN)
1955 {
1956 if (!insn_info)
1957 {
1958 insn_info = df_insn_create_insn_record (insn);
1959 insn_info->defs = 0;
1960 insn_info->uses = 0;
1961 insn_info->eq_uses = 0;
1962 insn_info->mw_hardregs = 0;
1963 }
1964
1965 bitmap_clear_bit (&df->insns_to_delete, uid);
1966 /* If the insn is set to be rescanned, it does not need to also
1967 be notes rescanned. */
1968 if (!bitmap_bit_p (&df->insns_to_rescan, uid))
1969 bitmap_set_bit (&df->insns_to_notes_rescan, INSN_UID (insn));
1970 return;
1971 }
1972
1973 bitmap_clear_bit (&df->insns_to_delete, uid);
1974 bitmap_clear_bit (&df->insns_to_notes_rescan, uid);
1975
1976 if (insn_info)
1977 {
1978 basic_block bb = BLOCK_FOR_INSN (insn);
1979 rtx note;
1980 class df_collection_rec collection_rec;
1981 unsigned int i;
1982
1983 df_mw_hardreg_chain_delete_eq_uses (insn_info);
1984 df_ref_chain_delete (insn_info->eq_uses);
1985 insn_info->eq_uses = NULL;
1986
1987 /* Process REG_EQUIV/REG_EQUAL notes */
1988 for (note = REG_NOTES (insn); note;
1989 note = XEXP (note, 1))
1990 {
1991 switch (REG_NOTE_KIND (note))
1992 {
1993 case REG_EQUIV:
1994 case REG_EQUAL:
1995 df_uses_record (&collection_rec,
1996 &XEXP (note, 0), DF_REF_REG_USE,
1997 bb, insn_info, DF_REF_IN_NOTE);
1998 default:
1999 break;
2000 }
2001 }
2002
2003 /* Find some place to put any new mw_hardregs. */
2004 df_canonize_collection_rec (&collection_rec);
2005 struct df_mw_hardreg **mw_ptr = &insn_info->mw_hardregs, *mw;
2006 FOR_EACH_VEC_ELT (collection_rec.mw_vec, i, mw)
2007 {
2008 while (*mw_ptr && df_mw_compare (*mw_ptr, mw) < 0)
2009 mw_ptr = &DF_MWS_NEXT (*mw_ptr);
2010 DF_MWS_NEXT (mw) = *mw_ptr;
2011 *mw_ptr = mw;
2012 mw_ptr = &DF_MWS_NEXT (mw);
2013 }
2014 df_refs_add_to_chains (&collection_rec, bb, insn, copy_eq_uses);
2015 }
2016 else
2017 df_insn_rescan (insn);
2018
2019 }
2020
2021
2022 /*----------------------------------------------------------------------------
2023 Hard core instruction scanning code. No external interfaces here,
2024 just a lot of routines that look inside insns.
2025 ----------------------------------------------------------------------------*/
2026
2027
2028 /* Return true if the contents of two df_ref's are identical.
2029 It ignores DF_REF_MARKER. */
2030
2031 static bool
df_ref_equal_p(df_ref ref1,df_ref ref2)2032 df_ref_equal_p (df_ref ref1, df_ref ref2)
2033 {
2034 if (!ref2)
2035 return false;
2036
2037 if (ref1 == ref2)
2038 return true;
2039
2040 if (DF_REF_CLASS (ref1) != DF_REF_CLASS (ref2)
2041 || DF_REF_REGNO (ref1) != DF_REF_REGNO (ref2)
2042 || DF_REF_REG (ref1) != DF_REF_REG (ref2)
2043 || DF_REF_TYPE (ref1) != DF_REF_TYPE (ref2)
2044 || ((DF_REF_FLAGS (ref1) & ~(DF_REF_REG_MARKER + DF_REF_MW_HARDREG))
2045 != (DF_REF_FLAGS (ref2) & ~(DF_REF_REG_MARKER + DF_REF_MW_HARDREG)))
2046 || DF_REF_BB (ref1) != DF_REF_BB (ref2)
2047 || DF_REF_INSN_INFO (ref1) != DF_REF_INSN_INFO (ref2))
2048 return false;
2049
2050 switch (DF_REF_CLASS (ref1))
2051 {
2052 case DF_REF_ARTIFICIAL:
2053 case DF_REF_BASE:
2054 return true;
2055
2056 case DF_REF_REGULAR:
2057 return DF_REF_LOC (ref1) == DF_REF_LOC (ref2);
2058
2059 default:
2060 gcc_unreachable ();
2061 }
2062 return false;
2063 }
2064
2065
2066 /* Compare REF1 and REF2 for sorting. This is only called from places
2067 where all of the refs are of the same type, in the same insn, and
2068 have the same bb. So these fields are not checked. */
2069
2070 static int
df_ref_compare(df_ref ref1,df_ref ref2)2071 df_ref_compare (df_ref ref1, df_ref ref2)
2072 {
2073 if (DF_REF_CLASS (ref1) != DF_REF_CLASS (ref2))
2074 return (int)DF_REF_CLASS (ref1) - (int)DF_REF_CLASS (ref2);
2075
2076 if (DF_REF_REGNO (ref1) != DF_REF_REGNO (ref2))
2077 return (int)DF_REF_REGNO (ref1) - (int)DF_REF_REGNO (ref2);
2078
2079 if (DF_REF_TYPE (ref1) != DF_REF_TYPE (ref2))
2080 return (int)DF_REF_TYPE (ref1) - (int)DF_REF_TYPE (ref2);
2081
2082 if (DF_REF_REG (ref1) != DF_REF_REG (ref2))
2083 return (int)DF_REF_ORDER (ref1) - (int)DF_REF_ORDER (ref2);
2084
2085 /* Cannot look at the LOC field on artificial refs. */
2086 if (DF_REF_CLASS (ref1) != DF_REF_ARTIFICIAL
2087 && DF_REF_LOC (ref1) != DF_REF_LOC (ref2))
2088 return (int)DF_REF_ORDER (ref1) - (int)DF_REF_ORDER (ref2);
2089
2090 if (DF_REF_FLAGS (ref1) != DF_REF_FLAGS (ref2))
2091 {
2092 /* If two refs are identical except that one of them has is from
2093 a mw and one is not, we need to have the one with the mw
2094 first. */
2095 if (DF_REF_FLAGS_IS_SET (ref1, DF_REF_MW_HARDREG) ==
2096 DF_REF_FLAGS_IS_SET (ref2, DF_REF_MW_HARDREG))
2097 return DF_REF_FLAGS (ref1) - DF_REF_FLAGS (ref2);
2098 else if (DF_REF_FLAGS_IS_SET (ref1, DF_REF_MW_HARDREG))
2099 return -1;
2100 else
2101 return 1;
2102 }
2103
2104 return (int)DF_REF_ORDER (ref1) - (int)DF_REF_ORDER (ref2);
2105 }
2106
2107 /* Like df_ref_compare, but compare two df_ref* pointers R1 and R2. */
2108
2109 static int
df_ref_ptr_compare(const void * r1,const void * r2)2110 df_ref_ptr_compare (const void *r1, const void *r2)
2111 {
2112 return df_ref_compare (*(const df_ref *) r1, *(const df_ref *) r2);
2113 }
2114
2115 /* Sort and compress a set of refs. */
2116
2117 static void
df_sort_and_compress_refs(vec<df_ref,va_heap> * ref_vec)2118 df_sort_and_compress_refs (vec<df_ref, va_heap> *ref_vec)
2119 {
2120 unsigned int count;
2121 unsigned int i;
2122 unsigned int dist = 0;
2123
2124 count = ref_vec->length ();
2125
2126 /* If there are 1 or 0 elements, there is nothing to do. */
2127 if (count < 2)
2128 return;
2129 else if (count == 2)
2130 {
2131 df_ref r0 = (*ref_vec)[0];
2132 df_ref r1 = (*ref_vec)[1];
2133 if (df_ref_compare (r0, r1) > 0)
2134 std::swap ((*ref_vec)[0], (*ref_vec)[1]);
2135 }
2136 else
2137 {
2138 for (i = 0; i < count - 1; i++)
2139 {
2140 df_ref r0 = (*ref_vec)[i];
2141 df_ref r1 = (*ref_vec)[i + 1];
2142 if (df_ref_compare (r0, r1) >= 0)
2143 break;
2144 }
2145 /* If the array is already strictly ordered,
2146 which is the most common case for large COUNT case
2147 (which happens for CALL INSNs),
2148 no need to sort and filter out duplicate.
2149 Simply return the count.
2150 Make sure DF_GET_ADD_REFS adds refs in the increasing order
2151 of DF_REF_COMPARE. */
2152 if (i == count - 1)
2153 return;
2154 ref_vec->qsort (df_ref_ptr_compare);
2155 }
2156
2157 for (i=0; i<count-dist; i++)
2158 {
2159 /* Find the next ref that is not equal to the current ref. */
2160 while (i + dist + 1 < count
2161 && df_ref_equal_p ((*ref_vec)[i],
2162 (*ref_vec)[i + dist + 1]))
2163 {
2164 df_free_ref ((*ref_vec)[i + dist + 1]);
2165 dist++;
2166 }
2167 /* Copy it down to the next position. */
2168 if (dist && i + dist + 1 < count)
2169 (*ref_vec)[i + 1] = (*ref_vec)[i + dist + 1];
2170 }
2171
2172 count -= dist;
2173 ref_vec->truncate (count);
2174 }
2175
2176
2177 /* Return true if the contents of two df_ref's are identical.
2178 It ignores DF_REF_MARKER. */
2179
2180 static bool
df_mw_equal_p(struct df_mw_hardreg * mw1,struct df_mw_hardreg * mw2)2181 df_mw_equal_p (struct df_mw_hardreg *mw1, struct df_mw_hardreg *mw2)
2182 {
2183 if (!mw2)
2184 return false;
2185 return (mw1 == mw2) ||
2186 (mw1->mw_reg == mw2->mw_reg
2187 && mw1->type == mw2->type
2188 && mw1->flags == mw2->flags
2189 && mw1->start_regno == mw2->start_regno
2190 && mw1->end_regno == mw2->end_regno);
2191 }
2192
2193
2194 /* Compare MW1 and MW2 for sorting. */
2195
2196 static int
df_mw_compare(const df_mw_hardreg * mw1,const df_mw_hardreg * mw2)2197 df_mw_compare (const df_mw_hardreg *mw1, const df_mw_hardreg *mw2)
2198 {
2199 if (mw1->type != mw2->type)
2200 return mw1->type - mw2->type;
2201
2202 if (mw1->flags != mw2->flags)
2203 return mw1->flags - mw2->flags;
2204
2205 if (mw1->start_regno != mw2->start_regno)
2206 return mw1->start_regno - mw2->start_regno;
2207
2208 if (mw1->end_regno != mw2->end_regno)
2209 return mw1->end_regno - mw2->end_regno;
2210
2211 return mw1->mw_order - mw2->mw_order;
2212 }
2213
2214 /* Like df_mw_compare, but compare two df_mw_hardreg** pointers R1 and R2. */
2215
2216 static int
df_mw_ptr_compare(const void * m1,const void * m2)2217 df_mw_ptr_compare (const void *m1, const void *m2)
2218 {
2219 return df_mw_compare (*(const df_mw_hardreg *const *) m1,
2220 *(const df_mw_hardreg *const *) m2);
2221 }
2222
2223 /* Sort and compress a set of refs. */
2224
2225 static void
df_sort_and_compress_mws(vec<df_mw_hardreg *,va_heap> * mw_vec)2226 df_sort_and_compress_mws (vec<df_mw_hardreg *, va_heap> *mw_vec)
2227 {
2228 unsigned int count;
2229 struct df_scan_problem_data *problem_data
2230 = (struct df_scan_problem_data *) df_scan->problem_data;
2231 unsigned int i;
2232 unsigned int dist = 0;
2233
2234 count = mw_vec->length ();
2235 if (count < 2)
2236 return;
2237 else if (count == 2)
2238 {
2239 struct df_mw_hardreg *m0 = (*mw_vec)[0];
2240 struct df_mw_hardreg *m1 = (*mw_vec)[1];
2241 if (df_mw_compare (m0, m1) > 0)
2242 {
2243 struct df_mw_hardreg *tmp = (*mw_vec)[0];
2244 (*mw_vec)[0] = (*mw_vec)[1];
2245 (*mw_vec)[1] = tmp;
2246 }
2247 }
2248 else
2249 mw_vec->qsort (df_mw_ptr_compare);
2250
2251 for (i=0; i<count-dist; i++)
2252 {
2253 /* Find the next ref that is not equal to the current ref. */
2254 while (i + dist + 1 < count
2255 && df_mw_equal_p ((*mw_vec)[i], (*mw_vec)[i + dist + 1]))
2256 {
2257 problem_data->mw_reg_pool->remove ((*mw_vec)[i + dist + 1]);
2258 dist++;
2259 }
2260 /* Copy it down to the next position. */
2261 if (dist && i + dist + 1 < count)
2262 (*mw_vec)[i + 1] = (*mw_vec)[i + dist + 1];
2263 }
2264
2265 count -= dist;
2266 mw_vec->truncate (count);
2267 }
2268
2269
2270 /* Sort and remove duplicates from the COLLECTION_REC. */
2271
2272 static void
df_canonize_collection_rec(class df_collection_rec * collection_rec)2273 df_canonize_collection_rec (class df_collection_rec *collection_rec)
2274 {
2275 df_sort_and_compress_refs (&collection_rec->def_vec);
2276 df_sort_and_compress_refs (&collection_rec->use_vec);
2277 df_sort_and_compress_refs (&collection_rec->eq_use_vec);
2278 df_sort_and_compress_mws (&collection_rec->mw_vec);
2279 }
2280
2281
2282 /* Add the new df_ref to appropriate reg_info/ref_info chains. */
2283
2284 static void
df_install_ref(df_ref this_ref,struct df_reg_info * reg_info,struct df_ref_info * ref_info,bool add_to_table)2285 df_install_ref (df_ref this_ref,
2286 struct df_reg_info *reg_info,
2287 struct df_ref_info *ref_info,
2288 bool add_to_table)
2289 {
2290 unsigned int regno = DF_REF_REGNO (this_ref);
2291 /* Add the ref to the reg_{def,use,eq_use} chain. */
2292 df_ref head = reg_info->reg_chain;
2293
2294 reg_info->reg_chain = this_ref;
2295 reg_info->n_refs++;
2296
2297 if (DF_REF_FLAGS_IS_SET (this_ref, DF_HARD_REG_LIVE))
2298 {
2299 gcc_assert (regno < FIRST_PSEUDO_REGISTER);
2300 df->hard_regs_live_count[regno]++;
2301 }
2302
2303 gcc_checking_assert (DF_REF_NEXT_REG (this_ref) == NULL
2304 && DF_REF_PREV_REG (this_ref) == NULL);
2305
2306 DF_REF_NEXT_REG (this_ref) = head;
2307
2308 /* We cannot actually link to the head of the chain. */
2309 DF_REF_PREV_REG (this_ref) = NULL;
2310
2311 if (head)
2312 DF_REF_PREV_REG (head) = this_ref;
2313
2314 if (add_to_table)
2315 {
2316 gcc_assert (ref_info->ref_order != DF_REF_ORDER_NO_TABLE);
2317 df_check_and_grow_ref_info (ref_info, 1);
2318 DF_REF_ID (this_ref) = ref_info->table_size;
2319 /* Add the ref to the big array of defs. */
2320 ref_info->refs[ref_info->table_size] = this_ref;
2321 ref_info->table_size++;
2322 }
2323 else
2324 DF_REF_ID (this_ref) = -1;
2325
2326 ref_info->total_size++;
2327 }
2328
2329
2330 /* This function takes one of the groups of refs (defs, uses or
2331 eq_uses) and installs the entire group into the insn. It also adds
2332 each of these refs into the appropriate chains. */
2333
2334 static df_ref
df_install_refs(basic_block bb,const vec<df_ref,va_heap> * old_vec,struct df_reg_info ** reg_info,struct df_ref_info * ref_info,bool is_notes)2335 df_install_refs (basic_block bb,
2336 const vec<df_ref, va_heap> *old_vec,
2337 struct df_reg_info **reg_info,
2338 struct df_ref_info *ref_info,
2339 bool is_notes)
2340 {
2341 unsigned int count = old_vec->length ();
2342 if (count)
2343 {
2344 bool add_to_table;
2345 df_ref this_ref;
2346 unsigned int ix;
2347
2348 switch (ref_info->ref_order)
2349 {
2350 case DF_REF_ORDER_UNORDERED_WITH_NOTES:
2351 case DF_REF_ORDER_BY_REG_WITH_NOTES:
2352 case DF_REF_ORDER_BY_INSN_WITH_NOTES:
2353 ref_info->ref_order = DF_REF_ORDER_UNORDERED_WITH_NOTES;
2354 add_to_table = true;
2355 break;
2356 case DF_REF_ORDER_UNORDERED:
2357 case DF_REF_ORDER_BY_REG:
2358 case DF_REF_ORDER_BY_INSN:
2359 ref_info->ref_order = DF_REF_ORDER_UNORDERED;
2360 add_to_table = !is_notes;
2361 break;
2362 default:
2363 add_to_table = false;
2364 break;
2365 }
2366
2367 /* Do not add if ref is not in the right blocks. */
2368 if (add_to_table && df->analyze_subset)
2369 add_to_table = bitmap_bit_p (df->blocks_to_analyze, bb->index);
2370
2371 FOR_EACH_VEC_ELT (*old_vec, ix, this_ref)
2372 {
2373 DF_REF_NEXT_LOC (this_ref) = (ix + 1 < old_vec->length ()
2374 ? (*old_vec)[ix + 1]
2375 : NULL);
2376 df_install_ref (this_ref, reg_info[DF_REF_REGNO (this_ref)],
2377 ref_info, add_to_table);
2378 }
2379 return (*old_vec)[0];
2380 }
2381 else
2382 return 0;
2383 }
2384
2385
2386 /* This function takes the mws installs the entire group into the
2387 insn. */
2388
2389 static struct df_mw_hardreg *
df_install_mws(const vec<df_mw_hardreg *,va_heap> * old_vec)2390 df_install_mws (const vec<df_mw_hardreg *, va_heap> *old_vec)
2391 {
2392 unsigned int count = old_vec->length ();
2393 if (count)
2394 {
2395 for (unsigned int i = 0; i < count - 1; i++)
2396 DF_MWS_NEXT ((*old_vec)[i]) = (*old_vec)[i + 1];
2397 DF_MWS_NEXT ((*old_vec)[count - 1]) = 0;
2398 return (*old_vec)[0];
2399 }
2400 else
2401 return 0;
2402 }
2403
2404
2405 /* Add a chain of df_refs to appropriate ref chain/reg_info/ref_info
2406 chains and update other necessary information. */
2407
2408 static void
df_refs_add_to_chains(class df_collection_rec * collection_rec,basic_block bb,rtx_insn * insn,unsigned int flags)2409 df_refs_add_to_chains (class df_collection_rec *collection_rec,
2410 basic_block bb, rtx_insn *insn, unsigned int flags)
2411 {
2412 if (insn)
2413 {
2414 struct df_insn_info *insn_rec = DF_INSN_INFO_GET (insn);
2415 /* If there is a vector in the collection rec, add it to the
2416 insn. A null rec is a signal that the caller will handle the
2417 chain specially. */
2418 if (flags & copy_defs)
2419 {
2420 gcc_checking_assert (!insn_rec->defs);
2421 insn_rec->defs
2422 = df_install_refs (bb, &collection_rec->def_vec,
2423 df->def_regs,
2424 &df->def_info, false);
2425 }
2426 if (flags & copy_uses)
2427 {
2428 gcc_checking_assert (!insn_rec->uses);
2429 insn_rec->uses
2430 = df_install_refs (bb, &collection_rec->use_vec,
2431 df->use_regs,
2432 &df->use_info, false);
2433 }
2434 if (flags & copy_eq_uses)
2435 {
2436 gcc_checking_assert (!insn_rec->eq_uses);
2437 insn_rec->eq_uses
2438 = df_install_refs (bb, &collection_rec->eq_use_vec,
2439 df->eq_use_regs,
2440 &df->use_info, true);
2441 }
2442 if (flags & copy_mw)
2443 {
2444 gcc_checking_assert (!insn_rec->mw_hardregs);
2445 insn_rec->mw_hardregs
2446 = df_install_mws (&collection_rec->mw_vec);
2447 }
2448 }
2449 else
2450 {
2451 struct df_scan_bb_info *bb_info = df_scan_get_bb_info (bb->index);
2452
2453 gcc_checking_assert (!bb_info->artificial_defs);
2454 bb_info->artificial_defs
2455 = df_install_refs (bb, &collection_rec->def_vec,
2456 df->def_regs,
2457 &df->def_info, false);
2458 gcc_checking_assert (!bb_info->artificial_uses);
2459 bb_info->artificial_uses
2460 = df_install_refs (bb, &collection_rec->use_vec,
2461 df->use_regs,
2462 &df->use_info, false);
2463 }
2464 }
2465
2466
2467 /* Allocate a ref and initialize its fields. */
2468
2469 static df_ref
df_ref_create_structure(enum df_ref_class cl,class df_collection_rec * collection_rec,rtx reg,rtx * loc,basic_block bb,struct df_insn_info * info,enum df_ref_type ref_type,int ref_flags)2470 df_ref_create_structure (enum df_ref_class cl,
2471 class df_collection_rec *collection_rec,
2472 rtx reg, rtx *loc,
2473 basic_block bb, struct df_insn_info *info,
2474 enum df_ref_type ref_type,
2475 int ref_flags)
2476 {
2477 df_ref this_ref = NULL;
2478 unsigned int regno = REGNO (GET_CODE (reg) == SUBREG ? SUBREG_REG (reg) : reg);
2479 struct df_scan_problem_data *problem_data
2480 = (struct df_scan_problem_data *) df_scan->problem_data;
2481
2482 switch (cl)
2483 {
2484 case DF_REF_BASE:
2485 this_ref = (df_ref) (problem_data->ref_base_pool->allocate ());
2486 gcc_checking_assert (loc == NULL);
2487 break;
2488
2489 case DF_REF_ARTIFICIAL:
2490 this_ref = (df_ref) (problem_data->ref_artificial_pool->allocate ());
2491 this_ref->artificial_ref.bb = bb;
2492 gcc_checking_assert (loc == NULL);
2493 break;
2494
2495 case DF_REF_REGULAR:
2496 this_ref = (df_ref) (problem_data->ref_regular_pool->allocate ());
2497 this_ref->regular_ref.loc = loc;
2498 gcc_checking_assert (loc);
2499 break;
2500 }
2501
2502 DF_REF_CLASS (this_ref) = cl;
2503 DF_REF_ID (this_ref) = -1;
2504 DF_REF_REG (this_ref) = reg;
2505 DF_REF_REGNO (this_ref) = regno;
2506 DF_REF_TYPE (this_ref) = ref_type;
2507 DF_REF_INSN_INFO (this_ref) = info;
2508 DF_REF_CHAIN (this_ref) = NULL;
2509 DF_REF_FLAGS (this_ref) = ref_flags;
2510 DF_REF_NEXT_REG (this_ref) = NULL;
2511 DF_REF_PREV_REG (this_ref) = NULL;
2512 DF_REF_ORDER (this_ref) = df->ref_order++;
2513
2514 /* We need to clear this bit because fwprop, and in the future
2515 possibly other optimizations sometimes create new refs using ond
2516 refs as the model. */
2517 DF_REF_FLAGS_CLEAR (this_ref, DF_HARD_REG_LIVE);
2518
2519 /* See if this ref needs to have DF_HARD_REG_LIVE bit set. */
2520 if (regno < FIRST_PSEUDO_REGISTER
2521 && !DF_REF_IS_ARTIFICIAL (this_ref)
2522 && !DEBUG_INSN_P (DF_REF_INSN (this_ref)))
2523 {
2524 if (DF_REF_REG_DEF_P (this_ref))
2525 {
2526 if (!DF_REF_FLAGS_IS_SET (this_ref, DF_REF_MAY_CLOBBER))
2527 DF_REF_FLAGS_SET (this_ref, DF_HARD_REG_LIVE);
2528 }
2529 else if (!(TEST_HARD_REG_BIT (elim_reg_set, regno)
2530 && (regno == FRAME_POINTER_REGNUM
2531 || regno == ARG_POINTER_REGNUM)))
2532 DF_REF_FLAGS_SET (this_ref, DF_HARD_REG_LIVE);
2533 }
2534
2535 if (collection_rec)
2536 {
2537 if (DF_REF_REG_DEF_P (this_ref))
2538 collection_rec->def_vec.safe_push (this_ref);
2539 else if (DF_REF_FLAGS (this_ref) & DF_REF_IN_NOTE)
2540 collection_rec->eq_use_vec.safe_push (this_ref);
2541 else
2542 collection_rec->use_vec.safe_push (this_ref);
2543 }
2544 else
2545 df_install_ref_incremental (this_ref);
2546
2547 return this_ref;
2548 }
2549
2550
2551 /* Create new references of type DF_REF_TYPE for each part of register REG
2552 at address LOC within INSN of BB. */
2553
2554
2555 static void
df_ref_record(enum df_ref_class cl,class df_collection_rec * collection_rec,rtx reg,rtx * loc,basic_block bb,struct df_insn_info * insn_info,enum df_ref_type ref_type,int ref_flags)2556 df_ref_record (enum df_ref_class cl,
2557 class df_collection_rec *collection_rec,
2558 rtx reg, rtx *loc,
2559 basic_block bb, struct df_insn_info *insn_info,
2560 enum df_ref_type ref_type,
2561 int ref_flags)
2562 {
2563 unsigned int regno;
2564
2565 gcc_checking_assert (REG_P (reg) || GET_CODE (reg) == SUBREG);
2566
2567 regno = REGNO (GET_CODE (reg) == SUBREG ? SUBREG_REG (reg) : reg);
2568 if (regno < FIRST_PSEUDO_REGISTER)
2569 {
2570 struct df_mw_hardreg *hardreg = NULL;
2571 struct df_scan_problem_data *problem_data
2572 = (struct df_scan_problem_data *) df_scan->problem_data;
2573 unsigned int i;
2574 unsigned int endregno;
2575 df_ref ref;
2576
2577 if (GET_CODE (reg) == SUBREG)
2578 {
2579 regno += subreg_regno_offset (regno, GET_MODE (SUBREG_REG (reg)),
2580 SUBREG_BYTE (reg), GET_MODE (reg));
2581 endregno = regno + subreg_nregs (reg);
2582 }
2583 else
2584 endregno = END_REGNO (reg);
2585
2586 /* If this is a multiword hardreg, we create some extra
2587 datastructures that will enable us to easily build REG_DEAD
2588 and REG_UNUSED notes. */
2589 if (collection_rec
2590 && (endregno != regno + 1) && insn_info)
2591 {
2592 /* Sets to a subreg of a multiword register are partial.
2593 Sets to a non-subreg of a multiword register are not. */
2594 if (GET_CODE (reg) == SUBREG)
2595 ref_flags |= DF_REF_PARTIAL;
2596 ref_flags |= DF_REF_MW_HARDREG;
2597
2598 hardreg = problem_data->mw_reg_pool->allocate ();
2599 hardreg->type = ref_type;
2600 hardreg->flags = ref_flags;
2601 hardreg->mw_reg = reg;
2602 hardreg->start_regno = regno;
2603 hardreg->end_regno = endregno - 1;
2604 hardreg->mw_order = df->ref_order++;
2605 collection_rec->mw_vec.safe_push (hardreg);
2606 }
2607
2608 for (i = regno; i < endregno; i++)
2609 {
2610 ref = df_ref_create_structure (cl, collection_rec, regno_reg_rtx[i], loc,
2611 bb, insn_info, ref_type, ref_flags);
2612
2613 gcc_assert (ORIGINAL_REGNO (DF_REF_REG (ref)) == i);
2614 }
2615 }
2616 else
2617 {
2618 df_ref_create_structure (cl, collection_rec, reg, loc, bb, insn_info,
2619 ref_type, ref_flags);
2620 }
2621 }
2622
2623
2624 /* Process all the registers defined in the rtx pointed by LOC.
2625 Autoincrement/decrement definitions will be picked up by df_uses_record.
2626 Any change here has to be matched in df_find_hard_reg_defs_1. */
2627
2628 static void
df_def_record_1(class df_collection_rec * collection_rec,rtx * loc,basic_block bb,struct df_insn_info * insn_info,int flags)2629 df_def_record_1 (class df_collection_rec *collection_rec,
2630 rtx *loc, basic_block bb, struct df_insn_info *insn_info,
2631 int flags)
2632 {
2633 rtx dst = *loc;
2634
2635 /* It is legal to have a set destination be a parallel. */
2636 if (GET_CODE (dst) == PARALLEL)
2637 {
2638 int i;
2639 for (i = XVECLEN (dst, 0) - 1; i >= 0; i--)
2640 {
2641 rtx temp = XVECEXP (dst, 0, i);
2642 gcc_assert (GET_CODE (temp) == EXPR_LIST);
2643 df_def_record_1 (collection_rec, &XEXP (temp, 0),
2644 bb, insn_info, flags);
2645 }
2646 return;
2647 }
2648
2649 if (GET_CODE (dst) == STRICT_LOW_PART)
2650 {
2651 flags |= DF_REF_READ_WRITE | DF_REF_PARTIAL | DF_REF_STRICT_LOW_PART;
2652
2653 loc = &XEXP (dst, 0);
2654 dst = *loc;
2655 }
2656
2657 if (GET_CODE (dst) == ZERO_EXTRACT)
2658 {
2659 flags |= DF_REF_READ_WRITE | DF_REF_PARTIAL | DF_REF_ZERO_EXTRACT;
2660
2661 loc = &XEXP (dst, 0);
2662 dst = *loc;
2663 }
2664
2665 /* At this point if we do not have a reg or a subreg, just return. */
2666 if (REG_P (dst))
2667 {
2668 df_ref_record (DF_REF_REGULAR, collection_rec,
2669 dst, loc, bb, insn_info, DF_REF_REG_DEF, flags);
2670
2671 /* We want to keep sp alive everywhere - by making all
2672 writes to sp also use of sp. */
2673 if (REGNO (dst) == STACK_POINTER_REGNUM)
2674 df_ref_record (DF_REF_BASE, collection_rec,
2675 dst, NULL, bb, insn_info, DF_REF_REG_USE, flags);
2676 }
2677 else if (GET_CODE (dst) == SUBREG && REG_P (SUBREG_REG (dst)))
2678 {
2679 if (read_modify_subreg_p (dst))
2680 flags |= DF_REF_READ_WRITE | DF_REF_PARTIAL;
2681
2682 flags |= DF_REF_SUBREG;
2683
2684 df_ref_record (DF_REF_REGULAR, collection_rec,
2685 dst, loc, bb, insn_info, DF_REF_REG_DEF, flags);
2686 }
2687 }
2688
2689
2690 /* Process all the registers defined in the pattern rtx, X. Any change
2691 here has to be matched in df_find_hard_reg_defs. */
2692
2693 static void
df_defs_record(class df_collection_rec * collection_rec,rtx x,basic_block bb,struct df_insn_info * insn_info,int flags)2694 df_defs_record (class df_collection_rec *collection_rec,
2695 rtx x, basic_block bb, struct df_insn_info *insn_info,
2696 int flags)
2697 {
2698 RTX_CODE code = GET_CODE (x);
2699 int i;
2700
2701 switch (code)
2702 {
2703 case SET:
2704 df_def_record_1 (collection_rec, &SET_DEST (x), bb, insn_info, flags);
2705 break;
2706
2707 case CLOBBER:
2708 flags |= DF_REF_MUST_CLOBBER;
2709 df_def_record_1 (collection_rec, &XEXP (x, 0), bb, insn_info, flags);
2710 break;
2711
2712 case COND_EXEC:
2713 df_defs_record (collection_rec, COND_EXEC_CODE (x),
2714 bb, insn_info, DF_REF_CONDITIONAL);
2715 break;
2716
2717 case PARALLEL:
2718 for (i = 0; i < XVECLEN (x, 0); i++)
2719 df_defs_record (collection_rec, XVECEXP (x, 0, i),
2720 bb, insn_info, flags);
2721 break;
2722 default:
2723 /* No DEFs to record in other cases */
2724 break;
2725 }
2726 }
2727
2728 /* Set bits in *DEFS for hard registers found in the rtx DST, which is the
2729 destination of a set or clobber. This has to match the logic in
2730 df_defs_record_1. */
2731
2732 static void
df_find_hard_reg_defs_1(rtx dst,HARD_REG_SET * defs)2733 df_find_hard_reg_defs_1 (rtx dst, HARD_REG_SET *defs)
2734 {
2735 /* It is legal to have a set destination be a parallel. */
2736 if (GET_CODE (dst) == PARALLEL)
2737 {
2738 int i;
2739 for (i = XVECLEN (dst, 0) - 1; i >= 0; i--)
2740 {
2741 rtx temp = XVECEXP (dst, 0, i);
2742 gcc_assert (GET_CODE (temp) == EXPR_LIST);
2743 df_find_hard_reg_defs_1 (XEXP (temp, 0), defs);
2744 }
2745 return;
2746 }
2747
2748 if (GET_CODE (dst) == STRICT_LOW_PART)
2749 dst = XEXP (dst, 0);
2750
2751 if (GET_CODE (dst) == ZERO_EXTRACT)
2752 dst = XEXP (dst, 0);
2753
2754 /* At this point if we do not have a reg or a subreg, just return. */
2755 if (REG_P (dst) && HARD_REGISTER_P (dst))
2756 SET_HARD_REG_BIT (*defs, REGNO (dst));
2757 else if (GET_CODE (dst) == SUBREG
2758 && REG_P (SUBREG_REG (dst)) && HARD_REGISTER_P (dst))
2759 SET_HARD_REG_BIT (*defs, REGNO (SUBREG_REG (dst)));
2760 }
2761
2762 /* Set bits in *DEFS for hard registers defined in the pattern X. This
2763 has to match the logic in df_defs_record. */
2764
2765 static void
df_find_hard_reg_defs(rtx x,HARD_REG_SET * defs)2766 df_find_hard_reg_defs (rtx x, HARD_REG_SET *defs)
2767 {
2768 RTX_CODE code = GET_CODE (x);
2769 int i;
2770
2771 switch (code)
2772 {
2773 case SET:
2774 df_find_hard_reg_defs_1 (SET_DEST (x), defs);
2775 break;
2776
2777 case CLOBBER:
2778 df_find_hard_reg_defs_1 (XEXP (x, 0), defs);
2779 break;
2780
2781 case COND_EXEC:
2782 df_find_hard_reg_defs (COND_EXEC_CODE (x), defs);
2783 break;
2784
2785 case PARALLEL:
2786 for (i = 0; i < XVECLEN (x, 0); i++)
2787 df_find_hard_reg_defs (XVECEXP (x, 0, i), defs);
2788 break;
2789 default:
2790 /* No DEFs to record in other cases */
2791 break;
2792 }
2793 }
2794
2795
2796 /* Process all the registers used in the rtx at address LOC. */
2797
2798 static void
df_uses_record(class df_collection_rec * collection_rec,rtx * loc,enum df_ref_type ref_type,basic_block bb,struct df_insn_info * insn_info,int flags)2799 df_uses_record (class df_collection_rec *collection_rec,
2800 rtx *loc, enum df_ref_type ref_type,
2801 basic_block bb, struct df_insn_info *insn_info,
2802 int flags)
2803 {
2804 RTX_CODE code;
2805 rtx x;
2806
2807 retry:
2808 x = *loc;
2809 if (!x)
2810 return;
2811 code = GET_CODE (x);
2812 switch (code)
2813 {
2814 case LABEL_REF:
2815 case SYMBOL_REF:
2816 case CONST:
2817 CASE_CONST_ANY:
2818 case PC:
2819 case CC0:
2820 case ADDR_VEC:
2821 case ADDR_DIFF_VEC:
2822 return;
2823
2824 case CLOBBER:
2825 /* If we are clobbering a MEM, mark any registers inside the address
2826 as being used. */
2827 if (MEM_P (XEXP (x, 0)))
2828 df_uses_record (collection_rec,
2829 &XEXP (XEXP (x, 0), 0),
2830 DF_REF_REG_MEM_STORE,
2831 bb, insn_info,
2832 flags);
2833
2834 /* If we're clobbering a REG then we have a def so ignore. */
2835 return;
2836
2837 case MEM:
2838 df_uses_record (collection_rec,
2839 &XEXP (x, 0), DF_REF_REG_MEM_LOAD,
2840 bb, insn_info, flags & DF_REF_IN_NOTE);
2841 return;
2842
2843 case SUBREG:
2844 /* While we're here, optimize this case. */
2845 flags |= DF_REF_PARTIAL;
2846 /* In case the SUBREG is not of a REG, do not optimize. */
2847 if (!REG_P (SUBREG_REG (x)))
2848 {
2849 loc = &SUBREG_REG (x);
2850 df_uses_record (collection_rec, loc, ref_type, bb, insn_info, flags);
2851 return;
2852 }
2853 /* Fall through */
2854
2855 case REG:
2856 df_ref_record (DF_REF_REGULAR, collection_rec,
2857 x, loc, bb, insn_info,
2858 ref_type, flags);
2859 return;
2860
2861 case SIGN_EXTRACT:
2862 case ZERO_EXTRACT:
2863 {
2864 df_uses_record (collection_rec,
2865 &XEXP (x, 1), ref_type, bb, insn_info, flags);
2866 df_uses_record (collection_rec,
2867 &XEXP (x, 2), ref_type, bb, insn_info, flags);
2868
2869 /* If the parameters to the zero or sign extract are
2870 constants, strip them off and recurse, otherwise there is
2871 no information that we can gain from this operation. */
2872 if (code == ZERO_EXTRACT)
2873 flags |= DF_REF_ZERO_EXTRACT;
2874 else
2875 flags |= DF_REF_SIGN_EXTRACT;
2876
2877 df_uses_record (collection_rec,
2878 &XEXP (x, 0), ref_type, bb, insn_info, flags);
2879 return;
2880 }
2881 break;
2882
2883 case SET:
2884 {
2885 rtx dst = SET_DEST (x);
2886 gcc_assert (!(flags & DF_REF_IN_NOTE));
2887 df_uses_record (collection_rec,
2888 &SET_SRC (x), DF_REF_REG_USE, bb, insn_info, flags);
2889
2890 switch (GET_CODE (dst))
2891 {
2892 case SUBREG:
2893 if (read_modify_subreg_p (dst))
2894 {
2895 df_uses_record (collection_rec, &SUBREG_REG (dst),
2896 DF_REF_REG_USE, bb, insn_info,
2897 flags | DF_REF_READ_WRITE | DF_REF_SUBREG);
2898 break;
2899 }
2900 /* Fall through. */
2901 case REG:
2902 case PARALLEL:
2903 case SCRATCH:
2904 case PC:
2905 case CC0:
2906 break;
2907 case MEM:
2908 df_uses_record (collection_rec, &XEXP (dst, 0),
2909 DF_REF_REG_MEM_STORE, bb, insn_info, flags);
2910 break;
2911 case STRICT_LOW_PART:
2912 {
2913 rtx *temp = &XEXP (dst, 0);
2914 /* A strict_low_part uses the whole REG and not just the
2915 SUBREG. */
2916 dst = XEXP (dst, 0);
2917 df_uses_record (collection_rec,
2918 (GET_CODE (dst) == SUBREG) ? &SUBREG_REG (dst) : temp,
2919 DF_REF_REG_USE, bb, insn_info,
2920 DF_REF_READ_WRITE | DF_REF_STRICT_LOW_PART);
2921 }
2922 break;
2923 case ZERO_EXTRACT:
2924 {
2925 df_uses_record (collection_rec, &XEXP (dst, 1),
2926 DF_REF_REG_USE, bb, insn_info, flags);
2927 df_uses_record (collection_rec, &XEXP (dst, 2),
2928 DF_REF_REG_USE, bb, insn_info, flags);
2929 if (GET_CODE (XEXP (dst,0)) == MEM)
2930 df_uses_record (collection_rec, &XEXP (dst, 0),
2931 DF_REF_REG_USE, bb, insn_info,
2932 flags);
2933 else
2934 df_uses_record (collection_rec, &XEXP (dst, 0),
2935 DF_REF_REG_USE, bb, insn_info,
2936 DF_REF_READ_WRITE | DF_REF_ZERO_EXTRACT);
2937 }
2938 break;
2939
2940 default:
2941 gcc_unreachable ();
2942 }
2943 return;
2944 }
2945
2946 case RETURN:
2947 case SIMPLE_RETURN:
2948 break;
2949
2950 case ASM_OPERANDS:
2951 case UNSPEC_VOLATILE:
2952 case TRAP_IF:
2953 case ASM_INPUT:
2954 {
2955 /* Traditional and volatile asm instructions must be
2956 considered to use and clobber all hard registers, all
2957 pseudo-registers and all of memory. So must TRAP_IF and
2958 UNSPEC_VOLATILE operations.
2959
2960 Consider for instance a volatile asm that changes the fpu
2961 rounding mode. An insn should not be moved across this
2962 even if it only uses pseudo-regs because it might give an
2963 incorrectly rounded result.
2964
2965 However, flow.c's liveness computation did *not* do this,
2966 giving the reasoning as " ?!? Unfortunately, marking all
2967 hard registers as live causes massive problems for the
2968 register allocator and marking all pseudos as live creates
2969 mountains of uninitialized variable warnings."
2970
2971 In order to maintain the status quo with regard to liveness
2972 and uses, we do what flow.c did and just mark any regs we
2973 can find in ASM_OPERANDS as used. In global asm insns are
2974 scanned and regs_asm_clobbered is filled out.
2975
2976 For all ASM_OPERANDS, we must traverse the vector of input
2977 operands. We cannot just fall through here since then we
2978 would be confused by the ASM_INPUT rtx inside ASM_OPERANDS,
2979 which do not indicate traditional asms unlike their normal
2980 usage. */
2981 if (code == ASM_OPERANDS)
2982 {
2983 int j;
2984
2985 for (j = 0; j < ASM_OPERANDS_INPUT_LENGTH (x); j++)
2986 df_uses_record (collection_rec, &ASM_OPERANDS_INPUT (x, j),
2987 DF_REF_REG_USE, bb, insn_info, flags);
2988 return;
2989 }
2990 break;
2991 }
2992
2993 case VAR_LOCATION:
2994 df_uses_record (collection_rec,
2995 &PAT_VAR_LOCATION_LOC (x),
2996 DF_REF_REG_USE, bb, insn_info, flags);
2997 return;
2998
2999 case PRE_DEC:
3000 case POST_DEC:
3001 case PRE_INC:
3002 case POST_INC:
3003 case PRE_MODIFY:
3004 case POST_MODIFY:
3005 gcc_assert (!DEBUG_INSN_P (insn_info->insn));
3006 /* Catch the def of the register being modified. */
3007 df_ref_record (DF_REF_REGULAR, collection_rec, XEXP (x, 0), &XEXP (x, 0),
3008 bb, insn_info,
3009 DF_REF_REG_DEF,
3010 flags | DF_REF_READ_WRITE | DF_REF_PRE_POST_MODIFY);
3011
3012 /* ... Fall through to handle uses ... */
3013
3014 default:
3015 break;
3016 }
3017
3018 /* Recursively scan the operands of this expression. */
3019 {
3020 const char *fmt = GET_RTX_FORMAT (code);
3021 int i;
3022
3023 for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--)
3024 {
3025 if (fmt[i] == 'e')
3026 {
3027 /* Tail recursive case: save a function call level. */
3028 if (i == 0)
3029 {
3030 loc = &XEXP (x, 0);
3031 goto retry;
3032 }
3033 df_uses_record (collection_rec, &XEXP (x, i), ref_type,
3034 bb, insn_info, flags);
3035 }
3036 else if (fmt[i] == 'E')
3037 {
3038 int j;
3039 for (j = 0; j < XVECLEN (x, i); j++)
3040 df_uses_record (collection_rec,
3041 &XVECEXP (x, i, j), ref_type,
3042 bb, insn_info, flags);
3043 }
3044 }
3045 }
3046
3047 return;
3048 }
3049
3050
3051 /* For all DF_REF_CONDITIONAL defs, add a corresponding uses. */
3052
3053 static void
df_get_conditional_uses(class df_collection_rec * collection_rec)3054 df_get_conditional_uses (class df_collection_rec *collection_rec)
3055 {
3056 unsigned int ix;
3057 df_ref ref;
3058
3059 FOR_EACH_VEC_ELT (collection_rec->def_vec, ix, ref)
3060 {
3061 if (DF_REF_FLAGS_IS_SET (ref, DF_REF_CONDITIONAL))
3062 {
3063 df_ref use;
3064
3065 use = df_ref_create_structure (DF_REF_CLASS (ref), collection_rec, DF_REF_REG (ref),
3066 DF_REF_LOC (ref), DF_REF_BB (ref),
3067 DF_REF_INSN_INFO (ref), DF_REF_REG_USE,
3068 DF_REF_FLAGS (ref) & ~DF_REF_CONDITIONAL);
3069 DF_REF_REGNO (use) = DF_REF_REGNO (ref);
3070 }
3071 }
3072 }
3073
3074
3075 /* Get call's extra defs and uses (track caller-saved registers). */
3076
3077 static void
df_get_call_refs(class df_collection_rec * collection_rec,basic_block bb,struct df_insn_info * insn_info,int flags)3078 df_get_call_refs (class df_collection_rec *collection_rec,
3079 basic_block bb,
3080 struct df_insn_info *insn_info,
3081 int flags)
3082 {
3083 rtx note;
3084 bool is_sibling_call;
3085 unsigned int i;
3086 HARD_REG_SET defs_generated;
3087
3088 CLEAR_HARD_REG_SET (defs_generated);
3089 df_find_hard_reg_defs (PATTERN (insn_info->insn), &defs_generated);
3090 is_sibling_call = SIBLING_CALL_P (insn_info->insn);
3091 function_abi callee_abi = insn_callee_abi (insn_info->insn);
3092
3093 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
3094 {
3095 if (i == STACK_POINTER_REGNUM)
3096 /* The stack ptr is used (honorarily) by a CALL insn. */
3097 df_ref_record (DF_REF_BASE, collection_rec, regno_reg_rtx[i],
3098 NULL, bb, insn_info, DF_REF_REG_USE,
3099 DF_REF_CALL_STACK_USAGE | flags);
3100 else if (global_regs[i])
3101 {
3102 /* Calls to const functions cannot access any global registers and
3103 calls to pure functions cannot set them. All other calls may
3104 reference any of the global registers, so they are recorded as
3105 used. */
3106 if (!RTL_CONST_CALL_P (insn_info->insn))
3107 {
3108 df_ref_record (DF_REF_BASE, collection_rec, regno_reg_rtx[i],
3109 NULL, bb, insn_info, DF_REF_REG_USE, flags);
3110 if (!RTL_PURE_CALL_P (insn_info->insn))
3111 df_ref_record (DF_REF_BASE, collection_rec, regno_reg_rtx[i],
3112 NULL, bb, insn_info, DF_REF_REG_DEF, flags);
3113 }
3114 }
3115 else if (callee_abi.clobbers_full_reg_p (i)
3116 /* no clobbers for regs that are the result of the call */
3117 && !TEST_HARD_REG_BIT (defs_generated, i)
3118 && (!is_sibling_call
3119 || !bitmap_bit_p (df->exit_block_uses, i)
3120 || refers_to_regno_p (i, crtl->return_rtx)))
3121 df_ref_record (DF_REF_BASE, collection_rec, regno_reg_rtx[i],
3122 NULL, bb, insn_info, DF_REF_REG_DEF,
3123 DF_REF_MAY_CLOBBER | flags);
3124 }
3125
3126 /* Record the registers used to pass arguments, and explicitly
3127 noted as clobbered. */
3128 for (note = CALL_INSN_FUNCTION_USAGE (insn_info->insn); note;
3129 note = XEXP (note, 1))
3130 {
3131 if (GET_CODE (XEXP (note, 0)) == USE)
3132 df_uses_record (collection_rec, &XEXP (XEXP (note, 0), 0),
3133 DF_REF_REG_USE, bb, insn_info, flags);
3134 else if (GET_CODE (XEXP (note, 0)) == CLOBBER)
3135 {
3136 if (REG_P (XEXP (XEXP (note, 0), 0)))
3137 {
3138 unsigned int regno = REGNO (XEXP (XEXP (note, 0), 0));
3139 if (!TEST_HARD_REG_BIT (defs_generated, regno))
3140 df_defs_record (collection_rec, XEXP (note, 0), bb,
3141 insn_info, flags);
3142 }
3143 else
3144 df_uses_record (collection_rec, &XEXP (note, 0),
3145 DF_REF_REG_USE, bb, insn_info, flags);
3146 }
3147 }
3148
3149 return;
3150 }
3151
3152 /* Collect all refs in the INSN. This function is free of any
3153 side-effect - it will create and return a lists of df_ref's in the
3154 COLLECTION_REC without putting those refs into existing ref chains
3155 and reg chains. */
3156
3157 static void
df_insn_refs_collect(class df_collection_rec * collection_rec,basic_block bb,struct df_insn_info * insn_info)3158 df_insn_refs_collect (class df_collection_rec *collection_rec,
3159 basic_block bb, struct df_insn_info *insn_info)
3160 {
3161 rtx note;
3162 bool is_cond_exec = (GET_CODE (PATTERN (insn_info->insn)) == COND_EXEC);
3163
3164 /* Clear out the collection record. */
3165 collection_rec->def_vec.truncate (0);
3166 collection_rec->use_vec.truncate (0);
3167 collection_rec->eq_use_vec.truncate (0);
3168 collection_rec->mw_vec.truncate (0);
3169
3170 /* Process REG_EQUIV/REG_EQUAL notes. */
3171 for (note = REG_NOTES (insn_info->insn); note;
3172 note = XEXP (note, 1))
3173 {
3174 switch (REG_NOTE_KIND (note))
3175 {
3176 case REG_EQUIV:
3177 case REG_EQUAL:
3178 df_uses_record (collection_rec,
3179 &XEXP (note, 0), DF_REF_REG_USE,
3180 bb, insn_info, DF_REF_IN_NOTE);
3181 break;
3182 case REG_NON_LOCAL_GOTO:
3183 /* The frame ptr is used by a non-local goto. */
3184 df_ref_record (DF_REF_BASE, collection_rec,
3185 regno_reg_rtx[FRAME_POINTER_REGNUM],
3186 NULL, bb, insn_info,
3187 DF_REF_REG_USE, 0);
3188 if (!HARD_FRAME_POINTER_IS_FRAME_POINTER)
3189 df_ref_record (DF_REF_BASE, collection_rec,
3190 regno_reg_rtx[HARD_FRAME_POINTER_REGNUM],
3191 NULL, bb, insn_info,
3192 DF_REF_REG_USE, 0);
3193 break;
3194 default:
3195 break;
3196 }
3197 }
3198
3199 int flags = (is_cond_exec) ? DF_REF_CONDITIONAL : 0;
3200 /* For CALL_INSNs, first record DF_REF_BASE register defs, as well as
3201 uses from CALL_INSN_FUNCTION_USAGE. */
3202 if (CALL_P (insn_info->insn))
3203 df_get_call_refs (collection_rec, bb, insn_info, flags);
3204
3205 /* Record other defs. These should be mostly for DF_REF_REGULAR, so
3206 that a qsort on the defs is unnecessary in most cases. */
3207 df_defs_record (collection_rec,
3208 PATTERN (insn_info->insn), bb, insn_info, 0);
3209
3210 /* Record the register uses. */
3211 df_uses_record (collection_rec,
3212 &PATTERN (insn_info->insn), DF_REF_REG_USE, bb, insn_info, 0);
3213
3214 /* DF_REF_CONDITIONAL needs corresponding USES. */
3215 if (is_cond_exec)
3216 df_get_conditional_uses (collection_rec);
3217
3218 df_canonize_collection_rec (collection_rec);
3219 }
3220
3221 /* Recompute the luids for the insns in BB. */
3222
3223 void
df_recompute_luids(basic_block bb)3224 df_recompute_luids (basic_block bb)
3225 {
3226 rtx_insn *insn;
3227 int luid = 0;
3228
3229 df_grow_insn_info ();
3230
3231 /* Scan the block an insn at a time from beginning to end. */
3232 FOR_BB_INSNS (bb, insn)
3233 {
3234 struct df_insn_info *insn_info = DF_INSN_INFO_GET (insn);
3235 /* Inserting labels does not always trigger the incremental
3236 rescanning. */
3237 if (!insn_info)
3238 {
3239 gcc_assert (!INSN_P (insn));
3240 insn_info = df_insn_create_insn_record (insn);
3241 }
3242
3243 DF_INSN_INFO_LUID (insn_info) = luid;
3244 if (INSN_P (insn))
3245 luid++;
3246 }
3247 }
3248
3249
3250 /* Collect all artificial refs at the block level for BB and add them
3251 to COLLECTION_REC. */
3252
3253 static void
df_bb_refs_collect(class df_collection_rec * collection_rec,basic_block bb)3254 df_bb_refs_collect (class df_collection_rec *collection_rec, basic_block bb)
3255 {
3256 collection_rec->def_vec.truncate (0);
3257 collection_rec->use_vec.truncate (0);
3258 collection_rec->eq_use_vec.truncate (0);
3259 collection_rec->mw_vec.truncate (0);
3260
3261 if (bb->index == ENTRY_BLOCK)
3262 {
3263 df_entry_block_defs_collect (collection_rec, df->entry_block_defs);
3264 return;
3265 }
3266 else if (bb->index == EXIT_BLOCK)
3267 {
3268 df_exit_block_uses_collect (collection_rec, df->exit_block_uses);
3269 return;
3270 }
3271
3272 if (bb_has_eh_pred (bb))
3273 {
3274 unsigned int i;
3275 /* Mark the registers that will contain data for the handler. */
3276 for (i = 0; ; ++i)
3277 {
3278 unsigned regno = EH_RETURN_DATA_REGNO (i);
3279 if (regno == INVALID_REGNUM)
3280 break;
3281 df_ref_record (DF_REF_ARTIFICIAL, collection_rec, regno_reg_rtx[regno], NULL,
3282 bb, NULL, DF_REF_REG_DEF, DF_REF_AT_TOP);
3283 }
3284 }
3285
3286 /* Add the hard_frame_pointer if this block is the target of a
3287 non-local goto. */
3288 if (bb->flags & BB_NON_LOCAL_GOTO_TARGET)
3289 df_ref_record (DF_REF_ARTIFICIAL, collection_rec, hard_frame_pointer_rtx, NULL,
3290 bb, NULL, DF_REF_REG_DEF, DF_REF_AT_TOP);
3291
3292 /* Add the artificial uses. */
3293 if (bb->index >= NUM_FIXED_BLOCKS)
3294 {
3295 bitmap_iterator bi;
3296 unsigned int regno;
3297 bitmap au = bb_has_eh_pred (bb)
3298 ? &df->eh_block_artificial_uses
3299 : &df->regular_block_artificial_uses;
3300
3301 EXECUTE_IF_SET_IN_BITMAP (au, 0, regno, bi)
3302 {
3303 df_ref_record (DF_REF_ARTIFICIAL, collection_rec, regno_reg_rtx[regno], NULL,
3304 bb, NULL, DF_REF_REG_USE, 0);
3305 }
3306 }
3307
3308 df_canonize_collection_rec (collection_rec);
3309 }
3310
3311
3312 /* Record all the refs within the basic block BB_INDEX and scan the instructions if SCAN_INSNS. */
3313
3314 void
df_bb_refs_record(int bb_index,bool scan_insns)3315 df_bb_refs_record (int bb_index, bool scan_insns)
3316 {
3317 basic_block bb = BASIC_BLOCK_FOR_FN (cfun, bb_index);
3318 rtx_insn *insn;
3319 int luid = 0;
3320
3321 if (!df)
3322 return;
3323
3324 df_collection_rec collection_rec;
3325 df_grow_bb_info (df_scan);
3326 if (scan_insns)
3327 /* Scan the block an insn at a time from beginning to end. */
3328 FOR_BB_INSNS (bb, insn)
3329 {
3330 struct df_insn_info *insn_info = DF_INSN_INFO_GET (insn);
3331 gcc_assert (!insn_info);
3332
3333 insn_info = df_insn_create_insn_record (insn);
3334 if (INSN_P (insn))
3335 {
3336 /* Record refs within INSN. */
3337 DF_INSN_INFO_LUID (insn_info) = luid++;
3338 df_insn_refs_collect (&collection_rec, bb, DF_INSN_INFO_GET (insn));
3339 df_refs_add_to_chains (&collection_rec, bb, insn, copy_all);
3340 }
3341 DF_INSN_INFO_LUID (insn_info) = luid;
3342 }
3343
3344 /* Other block level artificial refs */
3345 df_bb_refs_collect (&collection_rec, bb);
3346 df_refs_add_to_chains (&collection_rec, bb, NULL, copy_all);
3347
3348 /* Now that the block has been processed, set the block as dirty so
3349 LR and LIVE will get it processed. */
3350 df_set_bb_dirty (bb);
3351 }
3352
3353
3354 /* Get the artificial use set for a regular (i.e. non-exit/non-entry)
3355 block. */
3356
3357 static void
df_get_regular_block_artificial_uses(bitmap regular_block_artificial_uses)3358 df_get_regular_block_artificial_uses (bitmap regular_block_artificial_uses)
3359 {
3360 #ifdef EH_USES
3361 unsigned int i;
3362 #endif
3363
3364 bitmap_clear (regular_block_artificial_uses);
3365
3366 if (reload_completed)
3367 {
3368 if (frame_pointer_needed)
3369 bitmap_set_bit (regular_block_artificial_uses, HARD_FRAME_POINTER_REGNUM);
3370 }
3371 else
3372 /* Before reload, there are a few registers that must be forced
3373 live everywhere -- which might not already be the case for
3374 blocks within infinite loops. */
3375 {
3376 unsigned int picreg = PIC_OFFSET_TABLE_REGNUM;
3377
3378 /* Any reference to any pseudo before reload is a potential
3379 reference of the frame pointer. */
3380 bitmap_set_bit (regular_block_artificial_uses, FRAME_POINTER_REGNUM);
3381
3382 if (!HARD_FRAME_POINTER_IS_FRAME_POINTER)
3383 bitmap_set_bit (regular_block_artificial_uses,
3384 HARD_FRAME_POINTER_REGNUM);
3385
3386 /* Pseudos with argument area equivalences may require
3387 reloading via the argument pointer. */
3388 if (FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM
3389 && fixed_regs[ARG_POINTER_REGNUM])
3390 bitmap_set_bit (regular_block_artificial_uses, ARG_POINTER_REGNUM);
3391
3392 /* Any constant, or pseudo with constant equivalences, may
3393 require reloading from memory using the pic register. */
3394 if (picreg != INVALID_REGNUM
3395 && fixed_regs[picreg])
3396 bitmap_set_bit (regular_block_artificial_uses, picreg);
3397 }
3398 /* The all-important stack pointer must always be live. */
3399 bitmap_set_bit (regular_block_artificial_uses, STACK_POINTER_REGNUM);
3400
3401 #ifdef EH_USES
3402 /* EH_USES registers are used:
3403 1) at all insns that might throw (calls or with -fnon-call-exceptions
3404 trapping insns)
3405 2) in all EH edges
3406 3) to support backtraces and/or debugging, anywhere between their
3407 initialization and where they the saved registers are restored
3408 from them, including the cases where we don't reach the epilogue
3409 (noreturn call or infinite loop). */
3410 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
3411 if (EH_USES (i))
3412 bitmap_set_bit (regular_block_artificial_uses, i);
3413 #endif
3414 }
3415
3416
3417 /* Get the artificial use set for an eh block. */
3418
3419 static void
df_get_eh_block_artificial_uses(bitmap eh_block_artificial_uses)3420 df_get_eh_block_artificial_uses (bitmap eh_block_artificial_uses)
3421 {
3422 bitmap_clear (eh_block_artificial_uses);
3423
3424 /* The following code (down through the arg_pointer setting APPEARS
3425 to be necessary because there is nothing that actually
3426 describes what the exception handling code may actually need
3427 to keep alive. */
3428 if (reload_completed)
3429 {
3430 if (frame_pointer_needed)
3431 {
3432 bitmap_set_bit (eh_block_artificial_uses, FRAME_POINTER_REGNUM);
3433 if (!HARD_FRAME_POINTER_IS_FRAME_POINTER)
3434 bitmap_set_bit (eh_block_artificial_uses,
3435 HARD_FRAME_POINTER_REGNUM);
3436 }
3437 if (FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM
3438 && fixed_regs[ARG_POINTER_REGNUM])
3439 bitmap_set_bit (eh_block_artificial_uses, ARG_POINTER_REGNUM);
3440 }
3441 }
3442
3443
3444
3445 /*----------------------------------------------------------------------------
3446 Specialized hard register scanning functions.
3447 ----------------------------------------------------------------------------*/
3448
3449
3450 /* Mark a register in SET. Hard registers in large modes get all
3451 of their component registers set as well. */
3452
3453 static void
df_mark_reg(rtx reg,void * vset)3454 df_mark_reg (rtx reg, void *vset)
3455 {
3456 bitmap_set_range ((bitmap) vset, REGNO (reg), REG_NREGS (reg));
3457 }
3458
3459
3460 /* Set the bit for regs that are considered being defined at the entry. */
3461
3462 static void
df_get_entry_block_def_set(bitmap entry_block_defs)3463 df_get_entry_block_def_set (bitmap entry_block_defs)
3464 {
3465 rtx r;
3466 int i;
3467
3468 bitmap_clear (entry_block_defs);
3469
3470 /* For separate shrink-wrapping we use LIVE to analyze which basic blocks
3471 need a prologue for some component to be executed before that block,
3472 and we do not care about any other registers. Hence, we do not want
3473 any register for any component defined in the entry block, and we can
3474 just leave all registers undefined. */
3475 if (df_scan->local_flags & DF_SCAN_EMPTY_ENTRY_EXIT)
3476 return;
3477
3478 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
3479 {
3480 if (global_regs[i])
3481 bitmap_set_bit (entry_block_defs, i);
3482 if (FUNCTION_ARG_REGNO_P (i))
3483 bitmap_set_bit (entry_block_defs, INCOMING_REGNO (i));
3484 }
3485
3486 /* The always important stack pointer. */
3487 bitmap_set_bit (entry_block_defs, STACK_POINTER_REGNUM);
3488
3489 /* Once the prologue has been generated, all of these registers
3490 should just show up in the first regular block. */
3491 if (targetm.have_prologue () && epilogue_completed)
3492 {
3493 /* Defs for the callee saved registers are inserted so that the
3494 pushes have some defining location. */
3495 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
3496 if (!crtl->abi->clobbers_full_reg_p (i)
3497 && !fixed_regs[i]
3498 && df_regs_ever_live_p (i))
3499 bitmap_set_bit (entry_block_defs, i);
3500 }
3501
3502 r = targetm.calls.struct_value_rtx (current_function_decl, true);
3503 if (r && REG_P (r))
3504 bitmap_set_bit (entry_block_defs, REGNO (r));
3505
3506 /* If the function has an incoming STATIC_CHAIN, it has to show up
3507 in the entry def set. */
3508 r = rtx_for_static_chain (current_function_decl, true);
3509 if (r && REG_P (r))
3510 bitmap_set_bit (entry_block_defs, REGNO (r));
3511
3512 if ((!reload_completed) || frame_pointer_needed)
3513 {
3514 /* Any reference to any pseudo before reload is a potential
3515 reference of the frame pointer. */
3516 bitmap_set_bit (entry_block_defs, FRAME_POINTER_REGNUM);
3517
3518 /* If they are different, also mark the hard frame pointer as live. */
3519 if (!HARD_FRAME_POINTER_IS_FRAME_POINTER
3520 && !LOCAL_REGNO (HARD_FRAME_POINTER_REGNUM))
3521 bitmap_set_bit (entry_block_defs, HARD_FRAME_POINTER_REGNUM);
3522 }
3523
3524 /* These registers are live everywhere. */
3525 if (!reload_completed)
3526 {
3527 /* Pseudos with argument area equivalences may require
3528 reloading via the argument pointer. */
3529 if (FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM
3530 && fixed_regs[ARG_POINTER_REGNUM])
3531 bitmap_set_bit (entry_block_defs, ARG_POINTER_REGNUM);
3532
3533 /* Any constant, or pseudo with constant equivalences, may
3534 require reloading from memory using the pic register. */
3535 unsigned int picreg = PIC_OFFSET_TABLE_REGNUM;
3536 if (picreg != INVALID_REGNUM
3537 && fixed_regs[picreg])
3538 bitmap_set_bit (entry_block_defs, picreg);
3539 }
3540
3541 #ifdef INCOMING_RETURN_ADDR_RTX
3542 if (REG_P (INCOMING_RETURN_ADDR_RTX))
3543 bitmap_set_bit (entry_block_defs, REGNO (INCOMING_RETURN_ADDR_RTX));
3544 #endif
3545
3546 targetm.extra_live_on_entry (entry_block_defs);
3547 }
3548
3549
3550 /* Return the (conservative) set of hard registers that are defined on
3551 entry to the function.
3552 It uses df->entry_block_defs to determine which register
3553 reference to include. */
3554
3555 static void
df_entry_block_defs_collect(class df_collection_rec * collection_rec,bitmap entry_block_defs)3556 df_entry_block_defs_collect (class df_collection_rec *collection_rec,
3557 bitmap entry_block_defs)
3558 {
3559 unsigned int i;
3560 bitmap_iterator bi;
3561
3562 EXECUTE_IF_SET_IN_BITMAP (entry_block_defs, 0, i, bi)
3563 {
3564 df_ref_record (DF_REF_ARTIFICIAL, collection_rec, regno_reg_rtx[i], NULL,
3565 ENTRY_BLOCK_PTR_FOR_FN (cfun), NULL, DF_REF_REG_DEF, 0);
3566 }
3567
3568 df_canonize_collection_rec (collection_rec);
3569 }
3570
3571
3572 /* Record the (conservative) set of hard registers that are defined on
3573 entry to the function. */
3574
3575 static void
df_record_entry_block_defs(bitmap entry_block_defs)3576 df_record_entry_block_defs (bitmap entry_block_defs)
3577 {
3578 class df_collection_rec collection_rec;
3579 df_entry_block_defs_collect (&collection_rec, entry_block_defs);
3580
3581 /* Process bb_refs chain */
3582 df_refs_add_to_chains (&collection_rec,
3583 BASIC_BLOCK_FOR_FN (cfun, ENTRY_BLOCK),
3584 NULL,
3585 copy_defs);
3586 }
3587
3588
3589 /* Update the defs in the entry block. */
3590
3591 void
df_update_entry_block_defs(void)3592 df_update_entry_block_defs (void)
3593 {
3594 bool changed = false;
3595
3596 auto_bitmap refs (&df_bitmap_obstack);
3597 df_get_entry_block_def_set (refs);
3598 gcc_assert (df->entry_block_defs);
3599 if (!bitmap_equal_p (df->entry_block_defs, refs))
3600 {
3601 struct df_scan_bb_info *bb_info = df_scan_get_bb_info (ENTRY_BLOCK);
3602 df_ref_chain_delete_du_chain (bb_info->artificial_defs);
3603 df_ref_chain_delete (bb_info->artificial_defs);
3604 bb_info->artificial_defs = NULL;
3605 changed = true;
3606 }
3607
3608 if (changed)
3609 {
3610 df_record_entry_block_defs (refs);
3611 bitmap_copy (df->entry_block_defs, refs);
3612 df_set_bb_dirty (BASIC_BLOCK_FOR_FN (cfun, ENTRY_BLOCK));
3613 }
3614 }
3615
3616
3617 /* Return true if REGNO is used by the epilogue. */
3618 bool
df_epilogue_uses_p(unsigned int regno)3619 df_epilogue_uses_p (unsigned int regno)
3620 {
3621 return (EPILOGUE_USES (regno)
3622 || TEST_HARD_REG_BIT (crtl->must_be_zero_on_return, regno));
3623 }
3624
3625 /* Set the bit for regs that are considered being used at the exit. */
3626
3627 static void
df_get_exit_block_use_set(bitmap exit_block_uses)3628 df_get_exit_block_use_set (bitmap exit_block_uses)
3629 {
3630 unsigned int i;
3631 unsigned int picreg = PIC_OFFSET_TABLE_REGNUM;
3632
3633 bitmap_clear (exit_block_uses);
3634
3635 /* For separate shrink-wrapping we use LIVE to analyze which basic blocks
3636 need an epilogue for some component to be executed after that block,
3637 and we do not care about any other registers. Hence, we do not want
3638 any register for any component seen as used in the exit block, and we
3639 can just say no registers at all are used. */
3640 if (df_scan->local_flags & DF_SCAN_EMPTY_ENTRY_EXIT)
3641 return;
3642
3643 /* Stack pointer is always live at the exit. */
3644 bitmap_set_bit (exit_block_uses, STACK_POINTER_REGNUM);
3645
3646 /* Mark the frame pointer if needed at the end of the function.
3647 If we end up eliminating it, it will be removed from the live
3648 list of each basic block by reload. */
3649
3650 if ((!reload_completed) || frame_pointer_needed)
3651 {
3652 bitmap_set_bit (exit_block_uses, FRAME_POINTER_REGNUM);
3653
3654 /* If they are different, also mark the hard frame pointer as live. */
3655 if (!HARD_FRAME_POINTER_IS_FRAME_POINTER
3656 && !LOCAL_REGNO (HARD_FRAME_POINTER_REGNUM))
3657 bitmap_set_bit (exit_block_uses, HARD_FRAME_POINTER_REGNUM);
3658 }
3659
3660 /* Many architectures have a GP register even without flag_pic.
3661 Assume the pic register is not in use, or will be handled by
3662 other means, if it is not fixed. */
3663 if (!PIC_OFFSET_TABLE_REG_CALL_CLOBBERED
3664 && picreg != INVALID_REGNUM
3665 && fixed_regs[picreg])
3666 bitmap_set_bit (exit_block_uses, picreg);
3667
3668 /* Mark all global registers, and all registers used by the
3669 epilogue as being live at the end of the function since they
3670 may be referenced by our caller. */
3671 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
3672 if (global_regs[i] || df_epilogue_uses_p (i))
3673 bitmap_set_bit (exit_block_uses, i);
3674
3675 if (targetm.have_epilogue () && epilogue_completed)
3676 {
3677 /* Mark all call-saved registers that we actually used. */
3678 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
3679 if (df_regs_ever_live_p (i)
3680 && !LOCAL_REGNO (i)
3681 && !crtl->abi->clobbers_full_reg_p (i))
3682 bitmap_set_bit (exit_block_uses, i);
3683 }
3684
3685 /* Mark the registers that will contain data for the handler. */
3686 if (reload_completed && crtl->calls_eh_return)
3687 for (i = 0; ; ++i)
3688 {
3689 unsigned regno = EH_RETURN_DATA_REGNO (i);
3690 if (regno == INVALID_REGNUM)
3691 break;
3692 bitmap_set_bit (exit_block_uses, regno);
3693 }
3694
3695 #ifdef EH_RETURN_STACKADJ_RTX
3696 if ((!targetm.have_epilogue () || ! epilogue_completed)
3697 && crtl->calls_eh_return)
3698 {
3699 rtx tmp = EH_RETURN_STACKADJ_RTX;
3700 if (tmp && REG_P (tmp))
3701 df_mark_reg (tmp, exit_block_uses);
3702 }
3703 #endif
3704
3705 if ((!targetm.have_epilogue () || ! epilogue_completed)
3706 && crtl->calls_eh_return)
3707 {
3708 rtx tmp = EH_RETURN_HANDLER_RTX;
3709 if (tmp && REG_P (tmp))
3710 df_mark_reg (tmp, exit_block_uses);
3711 }
3712
3713 /* Mark function return value. */
3714 diddle_return_value (df_mark_reg, (void*) exit_block_uses);
3715 }
3716
3717
3718 /* Return the refs of hard registers that are used in the exit block.
3719 It uses df->exit_block_uses to determine register to include. */
3720
3721 static void
df_exit_block_uses_collect(class df_collection_rec * collection_rec,bitmap exit_block_uses)3722 df_exit_block_uses_collect (class df_collection_rec *collection_rec, bitmap exit_block_uses)
3723 {
3724 unsigned int i;
3725 bitmap_iterator bi;
3726
3727 EXECUTE_IF_SET_IN_BITMAP (exit_block_uses, 0, i, bi)
3728 df_ref_record (DF_REF_ARTIFICIAL, collection_rec, regno_reg_rtx[i], NULL,
3729 EXIT_BLOCK_PTR_FOR_FN (cfun), NULL, DF_REF_REG_USE, 0);
3730
3731 /* It is deliberate that this is not put in the exit block uses but
3732 I do not know why. */
3733 if (FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM
3734 && reload_completed
3735 && !bitmap_bit_p (exit_block_uses, ARG_POINTER_REGNUM)
3736 && bb_has_eh_pred (EXIT_BLOCK_PTR_FOR_FN (cfun))
3737 && fixed_regs[ARG_POINTER_REGNUM])
3738 df_ref_record (DF_REF_ARTIFICIAL, collection_rec, regno_reg_rtx[ARG_POINTER_REGNUM], NULL,
3739 EXIT_BLOCK_PTR_FOR_FN (cfun), NULL, DF_REF_REG_USE, 0);
3740
3741 df_canonize_collection_rec (collection_rec);
3742 }
3743
3744
3745 /* Record the set of hard registers that are used in the exit block.
3746 It uses df->exit_block_uses to determine which bit to include. */
3747
3748 static void
df_record_exit_block_uses(bitmap exit_block_uses)3749 df_record_exit_block_uses (bitmap exit_block_uses)
3750 {
3751 class df_collection_rec collection_rec;
3752 df_exit_block_uses_collect (&collection_rec, exit_block_uses);
3753
3754 /* Process bb_refs chain */
3755 df_refs_add_to_chains (&collection_rec,
3756 BASIC_BLOCK_FOR_FN (cfun, EXIT_BLOCK),
3757 NULL,
3758 copy_uses);
3759 }
3760
3761
3762 /* Update the uses in the exit block. */
3763
3764 void
df_update_exit_block_uses(void)3765 df_update_exit_block_uses (void)
3766 {
3767 bool changed = false;
3768
3769 auto_bitmap refs (&df_bitmap_obstack);
3770 df_get_exit_block_use_set (refs);
3771 gcc_assert (df->exit_block_uses);
3772 if (!bitmap_equal_p (df->exit_block_uses, refs))
3773 {
3774 struct df_scan_bb_info *bb_info = df_scan_get_bb_info (EXIT_BLOCK);
3775 df_ref_chain_delete_du_chain (bb_info->artificial_uses);
3776 df_ref_chain_delete (bb_info->artificial_uses);
3777 bb_info->artificial_uses = NULL;
3778 changed = true;
3779 }
3780
3781 if (changed)
3782 {
3783 df_record_exit_block_uses (refs);
3784 bitmap_copy (df->exit_block_uses, refs);
3785 df_set_bb_dirty (BASIC_BLOCK_FOR_FN (cfun, EXIT_BLOCK));
3786 }
3787 }
3788
3789 static bool initialized = false;
3790
3791
3792 /* Initialize some platform specific structures. */
3793
3794 void
df_hard_reg_init(void)3795 df_hard_reg_init (void)
3796 {
3797 int i;
3798 static const struct {const int from, to; } eliminables[] = ELIMINABLE_REGS;
3799
3800 if (initialized)
3801 return;
3802
3803 /* Record which registers will be eliminated. We use this in
3804 mark_used_regs. */
3805 CLEAR_HARD_REG_SET (elim_reg_set);
3806
3807 for (i = 0; i < (int) ARRAY_SIZE (eliminables); i++)
3808 SET_HARD_REG_BIT (elim_reg_set, eliminables[i].from);
3809
3810 initialized = true;
3811 }
3812
3813 /* Recompute the parts of scanning that are based on regs_ever_live
3814 because something changed in that array. */
3815
3816 void
df_update_entry_exit_and_calls(void)3817 df_update_entry_exit_and_calls (void)
3818 {
3819 basic_block bb;
3820
3821 df_update_entry_block_defs ();
3822 df_update_exit_block_uses ();
3823
3824 /* The call insns need to be rescanned because there may be changes
3825 in the set of registers clobbered across the call. */
3826 FOR_EACH_BB_FN (bb, cfun)
3827 {
3828 rtx_insn *insn;
3829 FOR_BB_INSNS (bb, insn)
3830 {
3831 if (INSN_P (insn) && CALL_P (insn))
3832 df_insn_rescan (insn);
3833 }
3834 }
3835 }
3836
3837
3838 /* Return true if hard REG is actually used in the some instruction.
3839 There are a fair number of conditions that affect the setting of
3840 this array. See the comment in df.h for df->hard_regs_live_count
3841 for the conditions that this array is set. */
3842
3843 bool
df_hard_reg_used_p(unsigned int reg)3844 df_hard_reg_used_p (unsigned int reg)
3845 {
3846 return df->hard_regs_live_count[reg] != 0;
3847 }
3848
3849
3850 /* A count of the number of times REG is actually used in the some
3851 instruction. There are a fair number of conditions that affect the
3852 setting of this array. See the comment in df.h for
3853 df->hard_regs_live_count for the conditions that this array is
3854 set. */
3855
3856
3857 unsigned int
df_hard_reg_used_count(unsigned int reg)3858 df_hard_reg_used_count (unsigned int reg)
3859 {
3860 return df->hard_regs_live_count[reg];
3861 }
3862
3863
3864 /* Get the value of regs_ever_live[REGNO]. */
3865
3866 bool
df_regs_ever_live_p(unsigned int regno)3867 df_regs_ever_live_p (unsigned int regno)
3868 {
3869 return regs_ever_live[regno];
3870 }
3871
3872 /* Set regs_ever_live[REGNO] to VALUE. If this cause regs_ever_live
3873 to change, schedule that change for the next update. */
3874
3875 void
df_set_regs_ever_live(unsigned int regno,bool value)3876 df_set_regs_ever_live (unsigned int regno, bool value)
3877 {
3878 if (regs_ever_live[regno] == value)
3879 return;
3880
3881 regs_ever_live[regno] = value;
3882 if (df)
3883 df->redo_entry_and_exit = true;
3884 }
3885
3886
3887 /* Compute "regs_ever_live" information from the underlying df
3888 information. Set the vector to all false if RESET. */
3889
3890 void
df_compute_regs_ever_live(bool reset)3891 df_compute_regs_ever_live (bool reset)
3892 {
3893 unsigned int i;
3894 bool changed = df->redo_entry_and_exit;
3895
3896 if (reset)
3897 memset (regs_ever_live, 0, sizeof (regs_ever_live));
3898
3899 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
3900 if ((!regs_ever_live[i]) && df_hard_reg_used_p (i))
3901 {
3902 regs_ever_live[i] = true;
3903 changed = true;
3904 }
3905 if (changed)
3906 df_update_entry_exit_and_calls ();
3907 df->redo_entry_and_exit = false;
3908 }
3909
3910
3911 /*----------------------------------------------------------------------------
3912 Dataflow ref information verification functions.
3913
3914 df_reg_chain_mark (refs, regno, is_def, is_eq_use)
3915 df_reg_chain_verify_unmarked (refs)
3916 df_refs_verify (vec<stack, va_df_ref>, ref*, bool)
3917 df_mws_verify (mw*, mw*, bool)
3918 df_insn_refs_verify (collection_rec, bb, insn, bool)
3919 df_bb_refs_verify (bb, refs, bool)
3920 df_bb_verify (bb)
3921 df_exit_block_bitmap_verify (bool)
3922 df_entry_block_bitmap_verify (bool)
3923 df_scan_verify ()
3924 ----------------------------------------------------------------------------*/
3925
3926
3927 /* Mark all refs in the reg chain. Verify that all of the registers
3928 are in the correct chain. */
3929
3930 static unsigned int
df_reg_chain_mark(df_ref refs,unsigned int regno,bool is_def,bool is_eq_use)3931 df_reg_chain_mark (df_ref refs, unsigned int regno,
3932 bool is_def, bool is_eq_use)
3933 {
3934 unsigned int count = 0;
3935 df_ref ref;
3936 for (ref = refs; ref; ref = DF_REF_NEXT_REG (ref))
3937 {
3938 gcc_assert (!DF_REF_IS_REG_MARKED (ref));
3939
3940 /* If there are no def-use or use-def chains, make sure that all
3941 of the chains are clear. */
3942 if (!df_chain)
3943 gcc_assert (!DF_REF_CHAIN (ref));
3944
3945 /* Check to make sure the ref is in the correct chain. */
3946 gcc_assert (DF_REF_REGNO (ref) == regno);
3947 if (is_def)
3948 gcc_assert (DF_REF_REG_DEF_P (ref));
3949 else
3950 gcc_assert (!DF_REF_REG_DEF_P (ref));
3951
3952 if (is_eq_use)
3953 gcc_assert ((DF_REF_FLAGS (ref) & DF_REF_IN_NOTE));
3954 else
3955 gcc_assert ((DF_REF_FLAGS (ref) & DF_REF_IN_NOTE) == 0);
3956
3957 if (DF_REF_NEXT_REG (ref))
3958 gcc_assert (DF_REF_PREV_REG (DF_REF_NEXT_REG (ref)) == ref);
3959 count++;
3960 DF_REF_REG_MARK (ref);
3961 }
3962 return count;
3963 }
3964
3965
3966 /* Verify that all of the registers in the chain are unmarked. */
3967
3968 static void
df_reg_chain_verify_unmarked(df_ref refs)3969 df_reg_chain_verify_unmarked (df_ref refs)
3970 {
3971 df_ref ref;
3972 for (ref = refs; ref; ref = DF_REF_NEXT_REG (ref))
3973 gcc_assert (!DF_REF_IS_REG_MARKED (ref));
3974 }
3975
3976
3977 /* Verify that NEW_REC and OLD_REC have exactly the same members. */
3978
3979 static bool
df_refs_verify(const vec<df_ref,va_heap> * new_rec,df_ref old_rec,bool abort_if_fail)3980 df_refs_verify (const vec<df_ref, va_heap> *new_rec, df_ref old_rec,
3981 bool abort_if_fail)
3982 {
3983 unsigned int ix;
3984 df_ref new_ref;
3985
3986 FOR_EACH_VEC_ELT (*new_rec, ix, new_ref)
3987 {
3988 if (old_rec == NULL || !df_ref_equal_p (new_ref, old_rec))
3989 {
3990 if (abort_if_fail)
3991 gcc_assert (0);
3992 else
3993 return false;
3994 }
3995
3996 /* Abort if fail is called from the function level verifier. If
3997 that is the context, mark this reg as being seem. */
3998 if (abort_if_fail)
3999 {
4000 gcc_assert (DF_REF_IS_REG_MARKED (old_rec));
4001 DF_REF_REG_UNMARK (old_rec);
4002 }
4003
4004 old_rec = DF_REF_NEXT_LOC (old_rec);
4005 }
4006
4007 if (abort_if_fail)
4008 gcc_assert (old_rec == NULL);
4009 else
4010 return old_rec == NULL;
4011 return false;
4012 }
4013
4014
4015 /* Verify that NEW_REC and OLD_REC have exactly the same members. */
4016
4017 static bool
df_mws_verify(const vec<df_mw_hardreg *,va_heap> * new_rec,struct df_mw_hardreg * old_rec,bool abort_if_fail)4018 df_mws_verify (const vec<df_mw_hardreg *, va_heap> *new_rec,
4019 struct df_mw_hardreg *old_rec,
4020 bool abort_if_fail)
4021 {
4022 unsigned int ix;
4023 struct df_mw_hardreg *new_reg;
4024
4025 FOR_EACH_VEC_ELT (*new_rec, ix, new_reg)
4026 {
4027 if (old_rec == NULL || !df_mw_equal_p (new_reg, old_rec))
4028 {
4029 if (abort_if_fail)
4030 gcc_assert (0);
4031 else
4032 return false;
4033 }
4034 old_rec = DF_MWS_NEXT (old_rec);
4035 }
4036
4037 if (abort_if_fail)
4038 gcc_assert (old_rec == NULL);
4039 else
4040 return old_rec == NULL;
4041 return false;
4042 }
4043
4044
4045 /* Return true if the existing insn refs information is complete and
4046 correct. Otherwise (i.e. if there's any missing or extra refs),
4047 return the correct df_ref chain in REFS_RETURN.
4048
4049 If ABORT_IF_FAIL, leave the refs that are verified (already in the
4050 ref chain) as DF_REF_MARKED(). If it's false, then it's a per-insn
4051 verification mode instead of the whole function, so unmark
4052 everything.
4053
4054 If ABORT_IF_FAIL is set, this function never returns false. */
4055
4056 static bool
df_insn_refs_verify(class df_collection_rec * collection_rec,basic_block bb,rtx_insn * insn,bool abort_if_fail)4057 df_insn_refs_verify (class df_collection_rec *collection_rec,
4058 basic_block bb,
4059 rtx_insn *insn,
4060 bool abort_if_fail)
4061 {
4062 bool ret1, ret2, ret3;
4063 unsigned int uid = INSN_UID (insn);
4064 struct df_insn_info *insn_info = DF_INSN_INFO_GET (insn);
4065
4066 df_insn_refs_collect (collection_rec, bb, insn_info);
4067
4068 /* Unfortunately we cannot opt out early if one of these is not
4069 right and abort_if_fail is set because the marks will not get cleared. */
4070 ret1 = df_refs_verify (&collection_rec->def_vec, DF_INSN_UID_DEFS (uid),
4071 abort_if_fail);
4072 if (!ret1 && !abort_if_fail)
4073 return false;
4074 ret2 = df_refs_verify (&collection_rec->use_vec, DF_INSN_UID_USES (uid),
4075 abort_if_fail);
4076 if (!ret2 && !abort_if_fail)
4077 return false;
4078 ret3 = df_refs_verify (&collection_rec->eq_use_vec, DF_INSN_UID_EQ_USES (uid),
4079 abort_if_fail);
4080 if (!ret3 && !abort_if_fail)
4081 return false;
4082 if (! df_mws_verify (&collection_rec->mw_vec, DF_INSN_UID_MWS (uid),
4083 abort_if_fail))
4084 return false;
4085 return (ret1 && ret2 && ret3);
4086 }
4087
4088
4089 /* Return true if all refs in the basic block are correct and complete.
4090 Due to df_ref_chain_verify, it will cause all refs
4091 that are verified to have DF_REF_MARK bit set. */
4092
4093 static bool
df_bb_verify(basic_block bb)4094 df_bb_verify (basic_block bb)
4095 {
4096 rtx_insn *insn;
4097 struct df_scan_bb_info *bb_info = df_scan_get_bb_info (bb->index);
4098 class df_collection_rec collection_rec;
4099
4100 gcc_assert (bb_info);
4101
4102 /* Scan the block, one insn at a time, from beginning to end. */
4103 FOR_BB_INSNS_REVERSE (bb, insn)
4104 {
4105 if (!INSN_P (insn))
4106 continue;
4107 df_insn_refs_verify (&collection_rec, bb, insn, true);
4108 df_free_collection_rec (&collection_rec);
4109 }
4110
4111 /* Do the artificial defs and uses. */
4112 df_bb_refs_collect (&collection_rec, bb);
4113 df_refs_verify (&collection_rec.def_vec, df_get_artificial_defs (bb->index), true);
4114 df_refs_verify (&collection_rec.use_vec, df_get_artificial_uses (bb->index), true);
4115 df_free_collection_rec (&collection_rec);
4116
4117 return true;
4118 }
4119
4120
4121 /* Returns true if the entry block has correct and complete df_ref set.
4122 If not it either aborts if ABORT_IF_FAIL is true or returns false. */
4123
4124 static bool
df_entry_block_bitmap_verify(bool abort_if_fail)4125 df_entry_block_bitmap_verify (bool abort_if_fail)
4126 {
4127 bool is_eq;
4128
4129 auto_bitmap entry_block_defs (&df_bitmap_obstack);
4130 df_get_entry_block_def_set (entry_block_defs);
4131
4132 is_eq = bitmap_equal_p (entry_block_defs, df->entry_block_defs);
4133
4134 if (!is_eq && abort_if_fail)
4135 {
4136 fprintf (stderr, "entry_block_defs = ");
4137 df_print_regset (stderr, entry_block_defs);
4138 fprintf (stderr, "df->entry_block_defs = ");
4139 df_print_regset (stderr, df->entry_block_defs);
4140 gcc_assert (0);
4141 }
4142
4143 return is_eq;
4144 }
4145
4146
4147 /* Returns true if the exit block has correct and complete df_ref set.
4148 If not it either aborts if ABORT_IF_FAIL is true or returns false. */
4149
4150 static bool
df_exit_block_bitmap_verify(bool abort_if_fail)4151 df_exit_block_bitmap_verify (bool abort_if_fail)
4152 {
4153 bool is_eq;
4154
4155 auto_bitmap exit_block_uses (&df_bitmap_obstack);
4156 df_get_exit_block_use_set (exit_block_uses);
4157
4158 is_eq = bitmap_equal_p (exit_block_uses, df->exit_block_uses);
4159
4160 if (!is_eq && abort_if_fail)
4161 {
4162 fprintf (stderr, "exit_block_uses = ");
4163 df_print_regset (stderr, exit_block_uses);
4164 fprintf (stderr, "df->exit_block_uses = ");
4165 df_print_regset (stderr, df->exit_block_uses);
4166 gcc_assert (0);
4167 }
4168
4169 return is_eq;
4170 }
4171
4172
4173 /* Return true if df_ref information for all insns in all blocks are
4174 correct and complete. */
4175
4176 void
df_scan_verify(void)4177 df_scan_verify (void)
4178 {
4179 unsigned int i;
4180 basic_block bb;
4181
4182 if (!df)
4183 return;
4184
4185 /* Verification is a 4 step process. */
4186
4187 /* (1) All of the refs are marked by going through the reg chains. */
4188 for (i = 0; i < DF_REG_SIZE (df); i++)
4189 {
4190 gcc_assert (df_reg_chain_mark (DF_REG_DEF_CHAIN (i), i, true, false)
4191 == DF_REG_DEF_COUNT (i));
4192 gcc_assert (df_reg_chain_mark (DF_REG_USE_CHAIN (i), i, false, false)
4193 == DF_REG_USE_COUNT (i));
4194 gcc_assert (df_reg_chain_mark (DF_REG_EQ_USE_CHAIN (i), i, false, true)
4195 == DF_REG_EQ_USE_COUNT (i));
4196 }
4197
4198 /* (2) There are various bitmaps whose value may change over the
4199 course of the compilation. This step recomputes them to make
4200 sure that they have not slipped out of date. */
4201 auto_bitmap regular_block_artificial_uses (&df_bitmap_obstack);
4202 auto_bitmap eh_block_artificial_uses (&df_bitmap_obstack);
4203
4204 df_get_regular_block_artificial_uses (regular_block_artificial_uses);
4205 df_get_eh_block_artificial_uses (eh_block_artificial_uses);
4206
4207 bitmap_ior_into (eh_block_artificial_uses,
4208 regular_block_artificial_uses);
4209
4210 /* Check artificial_uses bitmaps didn't change. */
4211 gcc_assert (bitmap_equal_p (regular_block_artificial_uses,
4212 &df->regular_block_artificial_uses));
4213 gcc_assert (bitmap_equal_p (eh_block_artificial_uses,
4214 &df->eh_block_artificial_uses));
4215
4216 /* Verify entry block and exit block. These only verify the bitmaps,
4217 the refs are verified in df_bb_verify. */
4218 df_entry_block_bitmap_verify (true);
4219 df_exit_block_bitmap_verify (true);
4220
4221 /* (3) All of the insns in all of the blocks are traversed and the
4222 marks are cleared both in the artificial refs attached to the
4223 blocks and the real refs inside the insns. It is a failure to
4224 clear a mark that has not been set as this means that the ref in
4225 the block or insn was not in the reg chain. */
4226
4227 FOR_ALL_BB_FN (bb, cfun)
4228 df_bb_verify (bb);
4229
4230 /* (4) See if all reg chains are traversed a second time. This time
4231 a check is made that the marks are clear. A set mark would be a
4232 from a reg that is not in any insn or basic block. */
4233
4234 for (i = 0; i < DF_REG_SIZE (df); i++)
4235 {
4236 df_reg_chain_verify_unmarked (DF_REG_DEF_CHAIN (i));
4237 df_reg_chain_verify_unmarked (DF_REG_USE_CHAIN (i));
4238 df_reg_chain_verify_unmarked (DF_REG_EQ_USE_CHAIN (i));
4239 }
4240 }
4241