Line data Source code
1 : /* Symbol table.
2 : Copyright (C) 2012-2026 Free Software Foundation, Inc.
3 : Contributed by Jan Hubicka
4 :
5 : This file is part of GCC.
6 :
7 : GCC is free software; you can redistribute it and/or modify it under
8 : the terms of the GNU General Public License as published by the Free
9 : Software Foundation; either version 3, or (at your option) any later
10 : version.
11 :
12 : GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 : WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 : FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 : for more details.
16 :
17 : You should have received a copy of the GNU General Public License
18 : along with GCC; see the file COPYING3. If not see
19 : <http://www.gnu.org/licenses/>. */
20 :
21 : #include "config.h"
22 : #include "system.h"
23 : #include "coretypes.h"
24 : #include "backend.h"
25 : #include "target.h"
26 : #include "rtl.h"
27 : #include "tree.h"
28 : #include "gimple.h"
29 : #include "timevar.h"
30 : #include "cgraph.h"
31 : #include "lto-streamer.h"
32 : #include "print-tree.h"
33 : #include "varasm.h"
34 : #include "langhooks.h"
35 : #include "output.h"
36 : #include "ipa-utils.h"
37 : #include "calls.h"
38 : #include "stringpool.h"
39 : #include "attribs.h"
40 : #include "builtins.h"
41 : #include "fold-const.h"
42 :
43 : static const char *ipa_ref_use_name[] = {"read","write","addr","alias"};
44 :
45 : const char * const ld_plugin_symbol_resolution_names[]=
46 : {
47 : "",
48 : "undef",
49 : "prevailing_def",
50 : "prevailing_def_ironly",
51 : "preempted_reg",
52 : "preempted_ir",
53 : "resolved_ir",
54 : "resolved_exec",
55 : "resolved_dyn",
56 : "prevailing_def_ironly_exp"
57 : };
58 :
59 : /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at ALIAS
60 : until we find an identifier that is not itself a transparent alias. */
61 :
62 : static inline tree
63 186 : ultimate_transparent_alias_target (tree alias)
64 : {
65 186 : tree target = alias;
66 :
67 186 : while (IDENTIFIER_TRANSPARENT_ALIAS (target))
68 : {
69 0 : gcc_checking_assert (TREE_CHAIN (target));
70 0 : target = TREE_CHAIN (target);
71 : }
72 186 : gcc_checking_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target)
73 : && ! TREE_CHAIN (target));
74 :
75 186 : return target;
76 : }
77 :
78 :
79 : /* Hash asmnames ignoring the user specified marks. */
80 :
81 : hashval_t
82 556944533 : symbol_table::decl_assembler_name_hash (const_tree asmname)
83 : {
84 556944533 : if (IDENTIFIER_POINTER (asmname)[0] == '*')
85 : {
86 3262218 : const char *decl_str = IDENTIFIER_POINTER (asmname) + 1;
87 3262218 : size_t ulp_len = strlen (user_label_prefix);
88 :
89 3262218 : if (ulp_len == 0)
90 : ;
91 85 : else if (strncmp (decl_str, user_label_prefix, ulp_len) == 0)
92 85 : decl_str += ulp_len;
93 :
94 3262218 : return htab_hash_string (decl_str);
95 : }
96 :
97 553682315 : return htab_hash_string (IDENTIFIER_POINTER (asmname));
98 : }
99 :
100 : /* Return true if assembler names NAME1 and NAME2 leads to the same symbol
101 : name. */
102 :
103 : bool
104 482806160 : symbol_table::assembler_names_equal_p (const char *name1, const char *name2)
105 : {
106 482806160 : if (name1 != name2)
107 : {
108 482806061 : if (name1[0] == '*')
109 : {
110 2792602 : size_t ulp_len = strlen (user_label_prefix);
111 :
112 2792602 : name1 ++;
113 :
114 2792602 : if (ulp_len == 0)
115 : ;
116 30 : else if (strncmp (name1, user_label_prefix, ulp_len) == 0)
117 30 : name1 += ulp_len;
118 : else
119 : return false;
120 : }
121 482806061 : if (name2[0] == '*')
122 : {
123 2443219 : size_t ulp_len = strlen (user_label_prefix);
124 :
125 2443219 : name2 ++;
126 :
127 2443219 : if (ulp_len == 0)
128 : ;
129 18 : else if (strncmp (name2, user_label_prefix, ulp_len) == 0)
130 18 : name2 += ulp_len;
131 : else
132 : return false;
133 : }
134 482806061 : return !strcmp (name1, name2);
135 : }
136 : return true;
137 : }
138 :
139 : /* Compare ASMNAME with the DECL_ASSEMBLER_NAME of DECL. */
140 :
141 : bool
142 578009452 : symbol_table::decl_assembler_name_equal (tree decl, const_tree asmname)
143 : {
144 578009452 : tree decl_asmname = DECL_ASSEMBLER_NAME (decl);
145 578009452 : const char *decl_str;
146 578009452 : const char *asmname_str;
147 :
148 578009452 : if (decl_asmname == asmname)
149 : return true;
150 :
151 482806061 : decl_str = IDENTIFIER_POINTER (decl_asmname);
152 482806061 : asmname_str = IDENTIFIER_POINTER (asmname);
153 482806061 : return assembler_names_equal_p (decl_str, asmname_str);
154 : }
155 :
156 :
157 : /* Returns nonzero if P1 and P2 are equal. */
158 :
159 : /* Insert NODE to assembler name hash. */
160 :
161 : void
162 163963969 : symbol_table::insert_to_assembler_name_hash (symtab_node *node,
163 : bool with_clones)
164 : {
165 207065377 : if (is_a <varpool_node *> (node) && DECL_HARD_REGISTER (node->decl))
166 : return;
167 163963760 : gcc_checking_assert (!node->previous_sharing_asm_name
168 : && !node->next_sharing_asm_name);
169 163963760 : if (assembler_name_hash)
170 : {
171 11692736 : symtab_node **aslot;
172 11692736 : cgraph_node *cnode;
173 11692736 : tree decl = node->decl;
174 :
175 11692736 : tree name = DECL_ASSEMBLER_NAME (node->decl);
176 :
177 : /* C++ FE can produce decls without associated assembler name and insert
178 : them to symtab to hold section or TLS information. */
179 11692736 : if (!name)
180 0 : return;
181 :
182 11692736 : hashval_t hash = decl_assembler_name_hash (name);
183 11692736 : aslot = assembler_name_hash->find_slot_with_hash (name, hash, INSERT);
184 11692736 : gcc_assert (*aslot != node);
185 11692736 : node->next_sharing_asm_name = (symtab_node *)*aslot;
186 11692736 : if (*aslot != NULL)
187 3070499 : (*aslot)->previous_sharing_asm_name = node;
188 11692736 : *aslot = node;
189 :
190 : /* Update also possible inline clones sharing a decl. */
191 23385472 : cnode = dyn_cast <cgraph_node *> (node);
192 8326417 : if (cnode && cnode->clones && with_clones)
193 16 : for (cnode = cnode->clones; cnode; cnode = cnode->next_sibling_clone)
194 10 : if (cnode->decl == decl)
195 2 : insert_to_assembler_name_hash (cnode, true);
196 : }
197 :
198 : }
199 :
200 : /* Remove NODE from assembler name hash. */
201 :
202 : void
203 148372165 : symbol_table::unlink_from_assembler_name_hash (symtab_node *node,
204 : bool with_clones)
205 : {
206 148372165 : if (assembler_name_hash)
207 : {
208 4885412 : cgraph_node *cnode;
209 4885412 : tree decl = node->decl;
210 :
211 4885412 : if (node->next_sharing_asm_name)
212 2665610 : node->next_sharing_asm_name->previous_sharing_asm_name
213 2665610 : = node->previous_sharing_asm_name;
214 4885412 : if (node->previous_sharing_asm_name)
215 : {
216 987491 : node->previous_sharing_asm_name->next_sharing_asm_name
217 987491 : = node->next_sharing_asm_name;
218 : }
219 : else
220 : {
221 3897921 : tree name = DECL_ASSEMBLER_NAME (node->decl);
222 3897921 : symtab_node **slot;
223 :
224 3897921 : if (!name)
225 0 : return;
226 :
227 3897921 : hashval_t hash = decl_assembler_name_hash (name);
228 3897921 : slot = assembler_name_hash->find_slot_with_hash (name, hash,
229 : NO_INSERT);
230 3897921 : gcc_assert (*slot == node);
231 3897921 : if (!node->next_sharing_asm_name)
232 1986037 : assembler_name_hash->clear_slot (slot);
233 : else
234 1911884 : *slot = node->next_sharing_asm_name;
235 : }
236 4885412 : node->next_sharing_asm_name = NULL;
237 4885412 : node->previous_sharing_asm_name = NULL;
238 :
239 : /* Update also possible inline clones sharing a decl. */
240 4885412 : cnode = dyn_cast <cgraph_node *> (node);
241 4782613 : if (cnode && cnode->clones && with_clones)
242 16 : for (cnode = cnode->clones; cnode; cnode = cnode->next_sibling_clone)
243 10 : if (cnode->decl == decl)
244 2 : unlink_from_assembler_name_hash (cnode, true);
245 : }
246 : }
247 :
248 : /* Arrange node to be first in its entry of assembler_name_hash. */
249 :
250 : void
251 2087 : symbol_table::symtab_prevail_in_asm_name_hash (symtab_node *node)
252 : {
253 2087 : unlink_from_assembler_name_hash (node, false);
254 2087 : insert_to_assembler_name_hash (node, false);
255 2087 : }
256 :
257 : /* Initialize asm name hash unless. */
258 :
259 : void
260 83441925 : symbol_table::symtab_initialize_asm_name_hash (void)
261 : {
262 83441925 : symtab_node *node;
263 83441925 : if (!assembler_name_hash)
264 : {
265 244350 : assembler_name_hash = hash_table<asmname_hasher>::create_ggc (10);
266 8725132 : FOR_EACH_SYMBOL (node)
267 8480782 : insert_to_assembler_name_hash (node, false);
268 : }
269 83441925 : }
270 :
271 : /* Set the DECL_ASSEMBLER_NAME and update symtab hashtables. */
272 :
273 : void
274 2848801 : symbol_table::change_decl_assembler_name (tree decl, tree name)
275 : {
276 2848801 : symtab_node *node = NULL;
277 :
278 : /* We can have user ASM names on things, like global register variables, that
279 : are not in the symbol table. */
280 13679 : if ((VAR_P (decl) && (TREE_STATIC (decl) || DECL_EXTERNAL (decl)))
281 2849895 : || TREE_CODE (decl) == FUNCTION_DECL)
282 2847707 : node = symtab_node::get (decl);
283 2848801 : if (!DECL_ASSEMBLER_NAME_SET_P (decl))
284 : {
285 1834452 : SET_DECL_ASSEMBLER_NAME (decl, name);
286 1834452 : if (node)
287 11 : insert_to_assembler_name_hash (node, true);
288 : }
289 : else
290 : {
291 1014349 : if (name == DECL_ASSEMBLER_NAME (decl))
292 : return;
293 :
294 156088 : tree alias = (IDENTIFIER_TRANSPARENT_ALIAS (DECL_ASSEMBLER_NAME (decl))
295 156088 : ? TREE_CHAIN (DECL_ASSEMBLER_NAME (decl))
296 0 : : NULL);
297 156088 : if (node)
298 8189 : unlink_from_assembler_name_hash (node, true);
299 :
300 156088 : const char *old_name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
301 156088 : if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
302 156088 : && DECL_RTL_SET_P (decl))
303 0 : warning (0, "%qD renamed after being referenced in assembly", decl);
304 :
305 156088 : SET_DECL_ASSEMBLER_NAME (decl, name);
306 156088 : if (DECL_RTL_SET_P (decl))
307 : {
308 1 : SET_DECL_RTL (decl, NULL);
309 1 : make_decl_rtl (decl);
310 : }
311 156088 : if (alias)
312 : {
313 0 : gcc_assert (!IDENTIFIER_INTERNAL_P (name));
314 0 : IDENTIFIER_TRANSPARENT_ALIAS (name) = 1;
315 0 : TREE_CHAIN (name) = alias;
316 : }
317 : /* If we change assembler name, also all transparent aliases must
318 : be updated. There are three kinds - those having same assembler name,
319 : those being renamed in varasm.cc and weakref being renamed by the
320 : assembler. */
321 156088 : if (node)
322 : {
323 8189 : insert_to_assembler_name_hash (node, true);
324 8189 : ipa_ref *ref;
325 8215 : for (unsigned i = 0; node->iterate_direct_aliases (i, ref); i++)
326 : {
327 26 : struct symtab_node *alias = ref->referring;
328 0 : if (alias->transparent_alias && !alias->weakref
329 26 : && symbol_table::assembler_names_equal_p
330 0 : (old_name, IDENTIFIER_POINTER (
331 : DECL_ASSEMBLER_NAME (alias->decl))))
332 0 : change_decl_assembler_name (alias->decl, name);
333 26 : else if (alias->transparent_alias
334 26 : && IDENTIFIER_TRANSPARENT_ALIAS (alias->decl))
335 : {
336 0 : gcc_assert (TREE_CHAIN (DECL_ASSEMBLER_NAME (alias->decl))
337 : && IDENTIFIER_TRANSPARENT_ALIAS
338 : (DECL_ASSEMBLER_NAME (alias->decl)));
339 :
340 0 : TREE_CHAIN (DECL_ASSEMBLER_NAME (alias->decl)) =
341 : ultimate_transparent_alias_target
342 0 : (DECL_ASSEMBLER_NAME (node->decl));
343 : }
344 : #ifdef ASM_OUTPUT_WEAKREF
345 26 : else gcc_assert (!alias->transparent_alias || alias->weakref);
346 : #else
347 : else gcc_assert (!alias->transparent_alias);
348 : #endif
349 : }
350 8189 : gcc_assert (!node->transparent_alias || !node->definition
351 : || node->weakref
352 : || TREE_CHAIN (DECL_ASSEMBLER_NAME (decl))
353 : || symbol_table::assembler_names_equal_p
354 : (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)),
355 : IDENTIFIER_POINTER
356 : (DECL_ASSEMBLER_NAME
357 : (node->get_alias_target ()->decl))));
358 : }
359 : }
360 : }
361 :
362 : /* Hash sections by their names. */
363 :
364 : hashval_t
365 12309052 : section_name_hasher::hash (section_hash_entry *n)
366 : {
367 12309052 : return htab_hash_string (n->name);
368 : }
369 :
370 : /* Return true if section P1 name equals to P2. */
371 :
372 : bool
373 12252757 : section_name_hasher::equal (section_hash_entry *n1, const char *name)
374 : {
375 12252757 : return n1->name == name || !strcmp (n1->name, name);
376 : }
377 :
378 : /* Bump the reference count on ENTRY so that it is retained. */
379 :
380 : static section_hash_entry *
381 47363 : retain_section_hash_entry (section_hash_entry *entry)
382 : {
383 47363 : entry->ref_count++;
384 47363 : return entry;
385 : }
386 :
387 : /* Drop the reference count on ENTRY and remove it if the reference
388 : count drops to zero. */
389 :
390 : static void
391 1872873 : release_section_hash_entry (section_hash_entry *entry)
392 : {
393 1872873 : if (entry)
394 : {
395 27695 : entry->ref_count--;
396 27695 : if (!entry->ref_count)
397 : {
398 24188 : hashval_t hash = htab_hash_string (entry->name);
399 24188 : section_hash_entry **slot
400 24188 : = symtab->section_hash->find_slot_with_hash (entry->name,
401 : hash, INSERT);
402 24188 : ggc_free (entry);
403 24188 : symtab->section_hash->clear_slot (slot);
404 : }
405 : }
406 1872873 : }
407 :
408 : /* Add node into symbol table. This function is not used directly, but via
409 : cgraph/varpool node creation routines. */
410 :
411 : void
412 155472898 : symtab_node::register_symbol (void)
413 : {
414 155472898 : symtab->register_symbol (this);
415 :
416 155472898 : if (!decl->decl_with_vis.symtab_node)
417 152537671 : decl->decl_with_vis.symtab_node = this;
418 :
419 155472898 : ref_list.clear ();
420 :
421 : /* Be sure to do this last; C++ FE might create new nodes via
422 : DECL_ASSEMBLER_NAME langhook! */
423 155472898 : symtab->insert_to_assembler_name_hash (this, false);
424 155472898 : }
425 :
426 : /* Remove NODE from same comdat group. */
427 :
428 : void
429 160516004 : symtab_node::remove_from_same_comdat_group (void)
430 : {
431 160516004 : if (same_comdat_group)
432 : {
433 : symtab_node *prev;
434 : for (prev = same_comdat_group;
435 17724174 : prev->same_comdat_group != this;
436 : prev = prev->same_comdat_group)
437 : ;
438 17072740 : if (same_comdat_group == prev)
439 16662470 : prev->same_comdat_group = NULL;
440 : else
441 410270 : prev->same_comdat_group = same_comdat_group;
442 17072740 : same_comdat_group = NULL;
443 17072740 : set_comdat_group (NULL);
444 : }
445 160516004 : }
446 :
447 : /* Remove node from symbol table. This function is not used directly, but via
448 : cgraph/varpool node removal routines.
449 : INFO is a clone info to attach to new root of clone tree (if any). */
450 :
451 : void
452 148361888 : symtab_node::unregister (clone_info *info)
453 : {
454 148361888 : remove_all_references ();
455 148361888 : remove_all_referring ();
456 :
457 : /* Remove reference to section. */
458 148361888 : set_section_for_node (NULL);
459 :
460 148361888 : remove_from_same_comdat_group ();
461 :
462 148361888 : symtab->unregister (this);
463 :
464 : /* During LTO symtab merging we temporarily corrupt decl to symtab node
465 : hash. */
466 148361888 : gcc_assert (decl->decl_with_vis.symtab_node || in_lto_p);
467 148361888 : if (decl->decl_with_vis.symtab_node == this)
468 : {
469 145892318 : symtab_node *replacement_node = NULL;
470 145892318 : if (cgraph_node *cnode = dyn_cast <cgraph_node *> (this))
471 109483570 : replacement_node = cnode->find_replacement (info);
472 145892318 : decl->decl_with_vis.symtab_node = replacement_node;
473 : }
474 148361888 : if (!is_a <varpool_node *> (this) || !DECL_HARD_REGISTER (decl))
475 148361887 : symtab->unlink_from_assembler_name_hash (this, false);
476 148361888 : if (in_init_priority_hash)
477 109 : symtab->init_priority_hash->remove (this);
478 148361888 : }
479 :
480 :
481 : /* Remove symbol from symbol table. */
482 :
483 : void
484 143489649 : symtab_node::remove (void)
485 : {
486 143489649 : if (cgraph_node *cnode = dyn_cast <cgraph_node *> (this))
487 107180050 : cnode->remove ();
488 36309599 : else if (varpool_node *vnode = dyn_cast <varpool_node *> (this))
489 36309599 : vnode->remove ();
490 143489649 : }
491 :
492 : /* Add NEW_ to the same comdat group that OLD is in. */
493 :
494 : void
495 17146477 : symtab_node::add_to_same_comdat_group (symtab_node *old_node)
496 : {
497 17146477 : gcc_assert (old_node->get_comdat_group ());
498 17146477 : gcc_assert (!same_comdat_group);
499 17146477 : gcc_assert (this != old_node);
500 :
501 17146477 : set_comdat_group (old_node->get_comdat_group ());
502 17146477 : same_comdat_group = old_node;
503 17146477 : if (!old_node->same_comdat_group)
504 16717949 : old_node->same_comdat_group = this;
505 : else
506 : {
507 : symtab_node *n;
508 : for (n = old_node->same_comdat_group;
509 774776 : n->same_comdat_group != old_node;
510 : n = n->same_comdat_group)
511 : ;
512 428528 : n->same_comdat_group = this;
513 : }
514 :
515 17146477 : cgraph_node *n;
516 17158773 : if (comdat_local_p ()
517 17158766 : && (n = dyn_cast <cgraph_node *> (this)) != NULL)
518 : {
519 27830 : for (cgraph_edge *e = n->callers; e; e = e->next_caller)
520 15541 : if (e->caller->inlined_to)
521 4338 : e->caller->inlined_to->calls_comdat_local = true;
522 : else
523 11203 : e->caller->calls_comdat_local = true;
524 : }
525 17146477 : }
526 :
527 : /* Dissolve the same_comdat_group list in which NODE resides. */
528 :
529 : void
530 2061 : symtab_node::dissolve_same_comdat_group_list (void)
531 : {
532 2061 : symtab_node *n = this;
533 2061 : symtab_node *next;
534 :
535 2061 : if (!same_comdat_group)
536 : return;
537 3816 : do
538 : {
539 3816 : next = n->same_comdat_group;
540 3816 : n->same_comdat_group = NULL;
541 3816 : if (dyn_cast <cgraph_node *> (n))
542 3546 : dyn_cast <cgraph_node *> (n)->calls_comdat_local = false;
543 : /* Clear comdat_group for comdat locals, since
544 : make_decl_local doesn't. */
545 3816 : if (!TREE_PUBLIC (n->decl))
546 2051 : n->set_comdat_group (NULL);
547 3816 : n = next;
548 : }
549 3816 : while (n != this);
550 : }
551 :
552 : /* Return printable assembler name of NODE.
553 : This function is used only for debugging. When assembler name
554 : is unknown go with identifier name. */
555 :
556 : const char *
557 44792 : symtab_node::asm_name () const
558 : {
559 44792 : if (!DECL_ASSEMBLER_NAME_SET_P (decl))
560 195 : return name ();
561 44597 : return IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
562 : }
563 :
564 : /* Return printable identifier name. */
565 :
566 : const char *
567 45420 : symtab_node::name () const
568 : {
569 45420 : if (!DECL_NAME (decl))
570 : {
571 0 : if (DECL_ASSEMBLER_NAME_SET_P (decl))
572 0 : return asm_name ();
573 : else
574 : return "<unnamed>";
575 : }
576 45420 : return lang_hooks.decl_printable_name (decl, 2);
577 : }
578 :
579 : const char *
580 81062 : symtab_node::get_dump_name (bool asm_name_p) const
581 : {
582 : #define EXTRA 16
583 81062 : const char *fname = asm_name_p ? asm_name () : name ();
584 81062 : unsigned l = strlen (fname);
585 :
586 81062 : char *s = (char *)ggc_internal_cleared_alloc (l + EXTRA);
587 81062 : snprintf (s, l + EXTRA, "%s/%d", fname, m_uid);
588 :
589 81062 : return s;
590 : }
591 :
592 : const char *
593 36642 : symtab_node::dump_name () const
594 : {
595 36642 : return get_dump_name (false);
596 : }
597 :
598 : const char *
599 44420 : symtab_node::dump_asm_name () const
600 : {
601 44420 : return get_dump_name (true);
602 : }
603 :
604 : /* Return ipa reference from this symtab_node to
605 : REFERRED_NODE or REFERRED_VARPOOL_NODE. USE_TYPE specify type
606 : of the use. */
607 :
608 : ipa_ref *
609 6548299 : symtab_node::create_reference (symtab_node *referred_node,
610 : enum ipa_ref_use use_type)
611 : {
612 6548299 : return create_reference (referred_node, use_type, NULL);
613 : }
614 :
615 :
616 : /* Return ipa reference from this symtab_node to
617 : REFERRED_NODE or REFERRED_VARPOOL_NODE. USE_TYPE specify type
618 : of the use and STMT the statement (if it exists). */
619 :
620 : ipa_ref *
621 42191536 : symtab_node::create_reference (symtab_node *referred_node,
622 : enum ipa_ref_use use_type, gimple *stmt)
623 : {
624 42191536 : ipa_ref *ref = NULL, *ref2 = NULL;
625 42191536 : ipa_ref_list *list, *list2;
626 42191536 : ipa_ref_t *old_references;
627 :
628 42191536 : gcc_checking_assert (!stmt || is_a <cgraph_node *> (this));
629 42191536 : gcc_checking_assert (use_type != IPA_REF_ALIAS || !stmt);
630 :
631 42191536 : list = &ref_list;
632 42191536 : old_references = list->references.address ();
633 69806459 : list->references.safe_grow (list->references.length () + 1, false);
634 42191536 : ref = &list->references.last ();
635 :
636 42191536 : list2 = &referred_node->ref_list;
637 :
638 : /* IPA_REF_ALIAS is always inserted at the beginning of the list. */
639 42191536 : if(use_type == IPA_REF_ALIAS)
640 : {
641 8638429 : list2->referring.safe_insert (0, ref);
642 8638429 : ref->referred_index = 0;
643 :
644 8786757 : for (unsigned int i = 1; i < list2->referring.length (); i++)
645 148328 : list2->referring[i]->referred_index = i;
646 : }
647 : else
648 : {
649 33553107 : list2->referring.safe_push (ref);
650 67106214 : ref->referred_index = list2->referring.length () - 1;
651 : }
652 :
653 42191536 : ref->referring = this;
654 42191536 : ref->referred = referred_node;
655 42191536 : ref->stmt = stmt;
656 42191536 : ref->lto_stmt_uid = 0;
657 42191536 : ref->speculative_id = 0;
658 42191536 : ref->use = use_type;
659 42191536 : ref->speculative = 0;
660 :
661 : /* If vector was moved in memory, update pointers. */
662 84383072 : if (old_references != list->references.address ())
663 : {
664 : int i;
665 53803164 : for (i = 0; iterate_reference(i, ref2); i++)
666 37893461 : ref2->referred_ref_list ()->referring[ref2->referred_index] = ref2;
667 : }
668 42191536 : return ref;
669 : }
670 :
671 : ipa_ref *
672 58642 : symtab_node::maybe_create_reference (tree val, gimple *stmt)
673 : {
674 58642 : STRIP_NOPS (val);
675 58642 : ipa_ref_use use_type;
676 :
677 58642 : switch (TREE_CODE (val))
678 : {
679 : case VAR_DECL:
680 : use_type = IPA_REF_LOAD;
681 : break;
682 8345 : case ADDR_EXPR:
683 8345 : use_type = IPA_REF_ADDR;
684 8345 : break;
685 49876 : default:
686 49876 : gcc_assert (!handled_component_p (val));
687 : return NULL;
688 : }
689 :
690 8766 : val = get_base_var (val);
691 8766 : if (val && VAR_OR_FUNCTION_DECL_P (val))
692 : {
693 4983 : symtab_node *referred = symtab_node::get (val);
694 4983 : gcc_checking_assert (referred);
695 4983 : return create_reference (referred, use_type, stmt);
696 : }
697 : return NULL;
698 : }
699 :
700 : /* Clone all references from symtab NODE to this symtab_node. */
701 :
702 : void
703 3064864 : symtab_node::clone_references (symtab_node *node)
704 : {
705 3064864 : ipa_ref *ref = NULL, *ref2 = NULL;
706 3064864 : int i;
707 3903296 : for (i = 0; node->iterate_reference (i, ref); i++)
708 : {
709 838432 : bool speculative = ref->speculative;
710 838432 : unsigned int stmt_uid = ref->lto_stmt_uid;
711 838432 : unsigned int spec_id = ref->speculative_id;
712 :
713 838432 : ref2 = create_reference (ref->referred, ref->use, ref->stmt);
714 838432 : ref2->speculative = speculative;
715 838432 : ref2->lto_stmt_uid = stmt_uid;
716 838432 : ref2->speculative_id = spec_id;
717 : }
718 3064864 : }
719 :
720 : /* Clone all referring from symtab NODE to this symtab_node. */
721 :
722 : void
723 2683 : symtab_node::clone_referring (symtab_node *node)
724 : {
725 2683 : ipa_ref *ref = NULL, *ref2 = NULL;
726 2683 : int i;
727 4610 : for (i = 0; node->iterate_referring(i, ref); i++)
728 : {
729 1927 : bool speculative = ref->speculative;
730 1927 : unsigned int stmt_uid = ref->lto_stmt_uid;
731 1927 : unsigned int spec_id = ref->speculative_id;
732 :
733 1927 : ref2 = ref->referring->create_reference (this, ref->use, ref->stmt);
734 1927 : ref2->speculative = speculative;
735 1927 : ref2->lto_stmt_uid = stmt_uid;
736 1927 : ref2->speculative_id = spec_id;
737 : }
738 2683 : }
739 :
740 : /* Clone reference REF to this symtab_node and set its stmt to STMT. */
741 :
742 : ipa_ref *
743 27101 : symtab_node::clone_reference (ipa_ref *ref, gimple *stmt)
744 : {
745 27101 : bool speculative = ref->speculative;
746 27101 : unsigned int stmt_uid = ref->lto_stmt_uid;
747 27101 : unsigned int spec_id = ref->speculative_id;
748 27101 : ipa_ref *ref2;
749 :
750 27101 : ref2 = create_reference (ref->referred, ref->use, stmt);
751 27101 : ref2->speculative = speculative;
752 27101 : ref2->lto_stmt_uid = stmt_uid;
753 27101 : ref2->speculative_id = spec_id;
754 27101 : return ref2;
755 : }
756 :
757 : /* Find the structure describing a reference to REFERRED_NODE of USE_TYPE and
758 : associated with statement STMT or LTO_STMT_UID. */
759 :
760 : ipa_ref *
761 8944 : symtab_node::find_reference (symtab_node *referred_node,
762 : gimple *stmt, unsigned int lto_stmt_uid,
763 : enum ipa_ref_use use_type)
764 : {
765 8944 : ipa_ref *r = NULL;
766 8944 : int i;
767 :
768 55924 : for (i = 0; iterate_reference (i, r); i++)
769 55921 : if (r->referred == referred_node
770 15501 : && !r->speculative
771 15501 : && r->use == use_type
772 12321 : && ((stmt && r->stmt == stmt)
773 3942 : || (lto_stmt_uid && r->lto_stmt_uid == lto_stmt_uid)
774 3776 : || (!stmt && !lto_stmt_uid && !r->stmt && !r->lto_stmt_uid)))
775 : return r;
776 : return NULL;
777 : }
778 :
779 : /* Remove all references that are associated with statement STMT. */
780 :
781 : void
782 64290 : symtab_node::remove_stmt_references (gimple *stmt)
783 : {
784 64290 : ipa_ref *r = NULL;
785 64290 : int i = 0;
786 :
787 68355 : while (iterate_reference (i, r))
788 4065 : if (r->stmt == stmt)
789 0 : r->remove_reference ();
790 : else
791 4065 : i++;
792 64290 : }
793 :
794 : /* Remove all stmt references in non-speculative references in THIS
795 : and all clones.
796 : Those are not maintained during inlining & cloning.
797 : The exception are speculative references that are updated along
798 : with callgraph edges associated with them. */
799 :
800 : void
801 2164467 : symtab_node::clear_stmts_in_references (void)
802 : {
803 2164467 : ipa_ref *r = NULL;
804 2164467 : int i;
805 :
806 8698089 : for (i = 0; iterate_reference (i, r); i++)
807 6533622 : if (!r->speculative)
808 : {
809 6518302 : r->stmt = NULL;
810 6518302 : r->lto_stmt_uid = 0;
811 6518302 : r->speculative_id = 0;
812 : }
813 2164467 : cgraph_node *cnode = dyn_cast <cgraph_node *> (this);
814 2164467 : if (cnode)
815 : {
816 2164467 : if (cnode->clones)
817 684960 : for (cnode = cnode->clones; cnode; cnode = cnode->next_sibling_clone)
818 561677 : cnode->clear_stmts_in_references ();
819 : }
820 2164467 : }
821 :
822 : /* Remove all references in ref list. */
823 :
824 : void
825 289320429 : symtab_node::remove_all_references (void)
826 : {
827 327256065 : while (ref_list.references.length ())
828 37935636 : ref_list.references.last ().remove_reference ();
829 289320429 : ref_list.references.release ();
830 289320429 : }
831 :
832 : /* Remove all referring items in ref list. */
833 :
834 : void
835 148361888 : symtab_node::remove_all_referring (void)
836 : {
837 148446313 : while (ref_list.referring.length ())
838 84425 : ref_list.referring.last ()->remove_reference ();
839 148361888 : ref_list.referring.release ();
840 148361888 : }
841 :
842 : /* Dump references in ref list to FILE. */
843 :
844 : void
845 8379 : symtab_node::dump_references (FILE *file)
846 : {
847 8379 : ipa_ref *ref = NULL;
848 8379 : int i;
849 15542 : for (i = 0; iterate_reference (i, ref); i++)
850 : {
851 7163 : fprintf (file, "%s (%s) ", ref->referred->dump_asm_name (),
852 7163 : ipa_ref_use_name[ref->use]);
853 7163 : if (ref->speculative)
854 113 : fprintf (file, "(speculative) ");
855 : }
856 8379 : fprintf (file, "\n");
857 8379 : }
858 :
859 : /* Dump referring in list to FILE. */
860 :
861 : void
862 8379 : symtab_node::dump_referring (FILE *file)
863 : {
864 8379 : ipa_ref *ref = NULL;
865 8379 : int i;
866 13466 : for (i = 0; iterate_referring(i, ref); i++)
867 : {
868 5087 : fprintf (file, "%s (%s) ", ref->referring->dump_asm_name (),
869 5087 : ipa_ref_use_name[ref->use]);
870 5087 : if (ref->speculative)
871 107 : fprintf (file, "(speculative) ");
872 : }
873 8379 : fprintf (file, "\n");
874 8379 : }
875 :
876 : static const char * const toplevel_type_names[] =
877 : {
878 : "base",
879 : "asm",
880 : "symbol",
881 : "function",
882 : "variable",
883 : };
884 :
885 : static_assert (ARRAY_SIZE(toplevel_type_names) == TOPLEVEL_MAX, "");
886 :
887 : /* Dump the visibility of the symbol. */
888 :
889 : const char *
890 0 : symtab_node::get_visibility_string () const
891 : {
892 0 : static const char * const visibility_types[]
893 : = { "default", "protected", "hidden", "internal" };
894 0 : return visibility_types[DECL_VISIBILITY (decl)];
895 : }
896 :
897 : /* Dump the type_name of the symbol. */
898 : const char *
899 0 : symtab_node::get_symtab_type_string () const
900 : {
901 0 : return toplevel_type_names[type];
902 : }
903 :
904 : /* Dump base fields of symtab nodes to F. Not to be used directly. */
905 :
906 : void
907 8379 : symtab_node::dump_base (FILE *f)
908 : {
909 8379 : static const char * const visibility_types[] = {
910 : "default", "protected", "hidden", "internal"
911 : };
912 :
913 8379 : fprintf (f, "%s (%s)", dump_asm_name (), name ());
914 8379 : if (dump_flags & TDF_ADDRESS)
915 103 : dump_addr (f, " @", (void *)this);
916 8379 : fprintf (f, "\n Type: %s", toplevel_type_names[type]);
917 :
918 8379 : if (definition)
919 6426 : fprintf (f, " definition");
920 8379 : if (analyzed)
921 6423 : fprintf (f, " analyzed");
922 8379 : if (alias)
923 100 : fprintf (f, " alias");
924 8379 : if (transparent_alias)
925 0 : fprintf (f, " transparent_alias");
926 8379 : if (weakref)
927 0 : fprintf (f, " weakref");
928 8379 : if (symver)
929 0 : fprintf (f, " symver");
930 8379 : if (cpp_implicit_alias)
931 81 : fprintf (f, " cpp_implicit_alias");
932 8379 : if (alias_target)
933 0 : fprintf (f, " target:%s",
934 0 : DECL_P (alias_target)
935 0 : ? IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME
936 : (alias_target))
937 0 : : IDENTIFIER_POINTER (alias_target));
938 8379 : if (body_removed)
939 631 : fprintf (f, "\n Body removed by symtab_remove_unreachable_nodes");
940 8379 : fprintf (f, "\n Visibility:");
941 8379 : if (in_other_partition)
942 0 : fprintf (f, " in_other_partition");
943 8379 : if (used_from_other_partition)
944 0 : fprintf (f, " used_from_other_partition");
945 8379 : if (force_output)
946 645 : fprintf (f, " force_output");
947 8379 : if (forced_by_abi)
948 540 : fprintf (f, " forced_by_abi");
949 8379 : if (externally_visible)
950 3903 : fprintf (f, " externally_visible");
951 8379 : if (semantic_interposition)
952 7911 : fprintf (f, " semantic_interposition");
953 8379 : if (no_reorder)
954 557 : fprintf (f, " no_reorder");
955 8379 : if (resolution != LDPR_UNKNOWN)
956 1091 : fprintf (f, " %s",
957 1091 : ld_plugin_symbol_resolution_names[(int)resolution]);
958 8379 : if (TREE_ASM_WRITTEN (decl))
959 194 : fprintf (f, " asm_written");
960 8379 : if (DECL_EXTERNAL (decl))
961 1698 : fprintf (f, " external");
962 8379 : if (TREE_PUBLIC (decl))
963 6477 : fprintf (f, " public");
964 8379 : if (DECL_COMMON (decl))
965 22 : fprintf (f, " common");
966 8379 : if (DECL_WEAK (decl))
967 1488 : fprintf (f, " weak");
968 8379 : if (DECL_DLLIMPORT_P (decl))
969 0 : fprintf (f, " dll_import");
970 8379 : if (DECL_COMDAT (decl))
971 1452 : fprintf (f, " comdat");
972 8379 : if (get_comdat_group ())
973 2710 : fprintf (f, " comdat_group:%s",
974 1355 : IDENTIFIER_POINTER (get_comdat_group_id ()));
975 8379 : if (DECL_ONE_ONLY (decl))
976 1401 : fprintf (f, " one_only");
977 8379 : if (get_section ())
978 38 : fprintf (f, " section:%s",
979 : get_section ());
980 8379 : if (implicit_section)
981 36 : fprintf (f," (implicit_section)");
982 8379 : if (DECL_VISIBILITY_SPECIFIED (decl))
983 577 : fprintf (f, " visibility_specified");
984 8379 : if (DECL_VISIBILITY (decl))
985 40 : fprintf (f, " visibility:%s",
986 20 : visibility_types [DECL_VISIBILITY (decl)]);
987 8379 : if (DECL_VIRTUAL_P (decl))
988 1325 : fprintf (f, " virtual");
989 8379 : if (DECL_ARTIFICIAL (decl))
990 2309 : fprintf (f, " artificial");
991 8379 : if (TREE_CODE (decl) == FUNCTION_DECL)
992 : {
993 5911 : if (DECL_STATIC_CONSTRUCTOR (decl))
994 48 : fprintf (f, " constructor");
995 5911 : if (DECL_STATIC_DESTRUCTOR (decl))
996 7 : fprintf (f, " destructor");
997 : }
998 8379 : if (ifunc_resolver)
999 3 : fprintf (f, " ifunc_resolver");
1000 8379 : fprintf (f, "\n");
1001 :
1002 8379 : if (same_comdat_group)
1003 158 : fprintf (f, " Same comdat group as: %s\n",
1004 : same_comdat_group->dump_asm_name ());
1005 8379 : if (next_sharing_asm_name)
1006 407 : fprintf (f, " next sharing asm name: %i\n",
1007 407 : next_sharing_asm_name->get_uid ());
1008 8379 : if (previous_sharing_asm_name)
1009 371 : fprintf (f, " previous sharing asm name: %i\n",
1010 371 : previous_sharing_asm_name->get_uid ());
1011 :
1012 8379 : if (address_taken)
1013 878 : fprintf (f, " Address is taken.\n");
1014 8379 : if (aux)
1015 : {
1016 511 : fprintf (f, " Aux:");
1017 511 : dump_addr (f, " @", (void *)aux);
1018 511 : fprintf (f, "\n");
1019 : }
1020 :
1021 8379 : fprintf (f, " References: ");
1022 8379 : dump_references (f);
1023 8379 : fprintf (f, " Referring: ");
1024 8379 : dump_referring (f);
1025 8379 : if (lto_file_data)
1026 255 : fprintf (f, " Read from file: %s\n",
1027 : lto_file_data->file_name);
1028 8379 : }
1029 :
1030 : /* Dump symtab node to F. */
1031 :
1032 : void
1033 7516 : symtab_node::dump (FILE *f)
1034 : {
1035 7516 : if (cgraph_node *cnode = dyn_cast <cgraph_node *> (this))
1036 5048 : cnode->dump (f);
1037 2468 : else if (varpool_node *vnode = dyn_cast <varpool_node *> (this))
1038 2468 : vnode->dump (f);
1039 7516 : }
1040 :
1041 : void
1042 0 : symtab_node::dump_graphviz (FILE *f)
1043 : {
1044 0 : if (cgraph_node *cnode = dyn_cast <cgraph_node *> (this))
1045 0 : cnode->dump_graphviz (f);
1046 0 : }
1047 :
1048 : void
1049 1256 : symbol_table::dump (FILE *f)
1050 : {
1051 1256 : symtab_node *node;
1052 1256 : fprintf (f, "Symbol table:\n\n");
1053 8769 : FOR_EACH_SYMBOL (node)
1054 7513 : node->dump (f);
1055 1256 : }
1056 :
1057 : void
1058 0 : symbol_table::dump_graphviz (FILE *f)
1059 : {
1060 0 : symtab_node *node;
1061 0 : fprintf (f, "digraph symtab {\n");
1062 0 : FOR_EACH_SYMBOL (node)
1063 0 : node->dump_graphviz (f);
1064 0 : fprintf (f, "}\n");
1065 0 : }
1066 :
1067 : DEBUG_FUNCTION void
1068 0 : symbol_table::debug (void)
1069 : {
1070 0 : dump (stderr);
1071 0 : }
1072 :
1073 : /* Return the cgraph node that has ASMNAME for its DECL_ASSEMBLER_NAME.
1074 : Return NULL if there's no such node. */
1075 :
1076 : symtab_node *
1077 82953279 : symtab_node::get_for_asmname (const_tree asmname)
1078 : {
1079 82953279 : symtab_node *node;
1080 :
1081 82953279 : symtab->symtab_initialize_asm_name_hash ();
1082 82953279 : hashval_t hash = symtab->decl_assembler_name_hash (asmname);
1083 82953279 : symtab_node **slot
1084 82953279 : = symtab->assembler_name_hash->find_slot_with_hash (asmname, hash,
1085 : NO_INSERT);
1086 :
1087 82953279 : if (slot)
1088 : {
1089 82950378 : node = *slot;
1090 82950378 : return node;
1091 : }
1092 : return NULL;
1093 : }
1094 :
1095 : /* Dump symtab node NODE to stderr. */
1096 :
1097 : DEBUG_FUNCTION void
1098 0 : symtab_node::debug (void)
1099 : {
1100 0 : dump (stderr);
1101 0 : }
1102 :
1103 : /* Verify common part of symtab nodes. */
1104 :
1105 : #if __GNUC__ >= 10
1106 : /* Disable warnings about missing quoting in GCC diagnostics for
1107 : the verification errors. Their format strings don't follow GCC
1108 : diagnostic conventions and the calls are ultimately followed by
1109 : one to internal_error. */
1110 : # pragma GCC diagnostic push
1111 : # pragma GCC diagnostic ignored "-Wformat-diag"
1112 : #endif
1113 :
1114 : DEBUG_FUNCTION bool
1115 83432000 : symtab_node::verify_base (void)
1116 : {
1117 83432000 : bool error_found = false;
1118 83432000 : symtab_node *hashed_node;
1119 :
1120 83432000 : if (is_a <cgraph_node *> (this))
1121 : {
1122 51577431 : if (TREE_CODE (decl) != FUNCTION_DECL)
1123 : {
1124 0 : error ("function symbol is not function");
1125 0 : error_found = true;
1126 : }
1127 51577431 : else if ((lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl))
1128 51577431 : != NULL)
1129 51577431 : != dyn_cast <cgraph_node *> (this)->ifunc_resolver)
1130 : {
1131 0 : error ("inconsistent %<ifunc%> attribute");
1132 0 : error_found = true;
1133 : }
1134 : }
1135 31854569 : else if (is_a <varpool_node *> (this))
1136 : {
1137 31854569 : if (!VAR_P (decl))
1138 : {
1139 0 : error ("variable symbol is not variable");
1140 0 : error_found = true;
1141 : }
1142 : }
1143 : else
1144 : {
1145 0 : error ("node has unknown type");
1146 0 : error_found = true;
1147 : }
1148 83432000 : if (order < 0 || order >= symtab->order)
1149 : {
1150 0 : error ("node has invalid order %i", order);
1151 0 : error_found = true;
1152 : }
1153 :
1154 83432000 : if (symtab->state != LTO_STREAMING)
1155 : {
1156 83276883 : hashed_node = symtab_node::get (decl);
1157 83276883 : if (!hashed_node)
1158 : {
1159 0 : error ("node not found node->decl->decl_with_vis.symtab_node");
1160 0 : error_found = true;
1161 : }
1162 83276883 : if (hashed_node != this
1163 88543010 : && (!is_a <cgraph_node *> (this)
1164 5266127 : || !dyn_cast <cgraph_node *> (this)->clone_of
1165 5266127 : || dyn_cast <cgraph_node *> (this)->clone_of->decl != decl))
1166 : {
1167 0 : error ("node differs from node->decl->decl_with_vis.symtab_node");
1168 0 : error_found = true;
1169 : }
1170 : }
1171 83432000 : if (symtab->assembler_name_hash)
1172 : {
1173 82871104 : hashed_node = symtab_node::get_for_asmname (DECL_ASSEMBLER_NAME (decl));
1174 82871104 : if (hashed_node)
1175 : {
1176 82870299 : if (hashed_node->previous_sharing_asm_name)
1177 : {
1178 0 : error ("assembler name hash list corrupted");
1179 0 : error_found = true;
1180 : }
1181 82870299 : else if (previous_sharing_asm_name == NULL)
1182 : {
1183 77577515 : if (hashed_node != this)
1184 : {
1185 0 : error ("assembler name hash list corrupted");
1186 0 : error_found = true;
1187 : }
1188 : }
1189 5292784 : else if (!(is_a <varpool_node *> (this) && DECL_HARD_REGISTER (decl)))
1190 : {
1191 5292784 : if (!asmname_hasher::equal (previous_sharing_asm_name,
1192 5292784 : DECL_ASSEMBLER_NAME (decl)))
1193 : {
1194 0 : error ("node not found in symtab assembler name hash");
1195 0 : error_found = true;
1196 : }
1197 : }
1198 : }
1199 : }
1200 83432000 : if (previous_sharing_asm_name
1201 5292784 : && previous_sharing_asm_name->next_sharing_asm_name != this)
1202 : {
1203 0 : error ("double linked list of assembler names corrupted");
1204 0 : error_found = true;
1205 : }
1206 83432000 : if (body_removed && definition)
1207 : {
1208 0 : error ("node has body_removed but is definition");
1209 0 : error_found = true;
1210 : }
1211 83432000 : if (analyzed && !definition)
1212 : {
1213 0 : error ("node is analyzed but it is not a definition");
1214 0 : error_found = true;
1215 : }
1216 83432000 : if (cpp_implicit_alias && !alias)
1217 : {
1218 0 : error ("node is alias but not implicit alias");
1219 0 : error_found = true;
1220 : }
1221 83432000 : if (alias && !definition && !weakref)
1222 : {
1223 0 : error ("node is alias but not definition");
1224 0 : error_found = true;
1225 : }
1226 83432000 : if (weakref && !transparent_alias)
1227 : {
1228 0 : error ("node is weakref but not an transparent_alias");
1229 0 : error_found = true;
1230 : }
1231 83432000 : if (transparent_alias && !alias)
1232 : {
1233 0 : error ("node is transparent_alias but not an alias");
1234 0 : error_found = true;
1235 : }
1236 83432000 : if (symver && !alias)
1237 : {
1238 0 : error ("node is symver but not alias");
1239 0 : error_found = true;
1240 : }
1241 : /* Limitation of gas requires us to output targets of symver aliases as
1242 : global symbols. This is binutils PR 25295. */
1243 83432000 : if (symver
1244 83432000 : && (!TREE_PUBLIC (get_alias_target ()->decl)
1245 16 : || DECL_VISIBILITY (get_alias_target ()->decl) != VISIBILITY_DEFAULT))
1246 : {
1247 0 : error ("symver target is not exported with default visibility");
1248 0 : error_found = true;
1249 : }
1250 83432000 : if (symver
1251 83432000 : && (!TREE_PUBLIC (decl)
1252 16 : || DECL_VISIBILITY (decl) != VISIBILITY_DEFAULT))
1253 : {
1254 0 : error ("symver is not exported with default visibility");
1255 0 : error_found = true;
1256 : }
1257 83432000 : if (same_comdat_group)
1258 : {
1259 3181131 : symtab_node *n = same_comdat_group;
1260 :
1261 3181131 : if (!n->get_comdat_group ())
1262 : {
1263 0 : error ("node is in same_comdat_group list but has no comdat_group");
1264 0 : error_found = true;
1265 : }
1266 3181131 : if (n->get_comdat_group () != get_comdat_group ())
1267 : {
1268 0 : error ("same_comdat_group list across different groups");
1269 0 : error_found = true;
1270 : }
1271 3181131 : if (n->type != type)
1272 : {
1273 0 : error ("mixing different types of symbol in same comdat groups is not supported");
1274 0 : error_found = true;
1275 : }
1276 3181131 : if (n == this)
1277 : {
1278 0 : error ("node is alone in a comdat group");
1279 0 : error_found = true;
1280 : }
1281 5718231 : do
1282 : {
1283 5718231 : if (!n->same_comdat_group)
1284 : {
1285 0 : error ("same_comdat_group is not a circular list");
1286 0 : error_found = true;
1287 0 : break;
1288 : }
1289 5718231 : n = n->same_comdat_group;
1290 : }
1291 5718231 : while (n != this);
1292 3181131 : if (comdat_local_p ())
1293 : {
1294 51750 : ipa_ref *ref = NULL;
1295 :
1296 53190 : for (int i = 0; iterate_referring (i, ref); ++i)
1297 : {
1298 1440 : if (!in_same_comdat_group_p (ref->referring))
1299 : {
1300 0 : error ("comdat-local symbol referred to by %s outside its "
1301 : "comdat",
1302 : identifier_to_locale (ref->referring->name()));
1303 0 : error_found = true;
1304 : }
1305 : }
1306 : }
1307 : }
1308 98798271 : if (implicit_section && !get_section ())
1309 : {
1310 0 : error ("implicit_section flag is set but section isn%'t");
1311 0 : error_found = true;
1312 : }
1313 98802500 : if (get_section () && get_comdat_group ()
1314 2837602 : && !implicit_section
1315 15370764 : && !lookup_attribute ("section", DECL_ATTRIBUTES (decl)))
1316 : {
1317 0 : error ("Both section and comdat group is set");
1318 0 : error_found = true;
1319 : }
1320 : /* TODO: Add string table for sections, so we do not keep holding duplicated
1321 : strings. */
1322 1449765 : if (alias && definition
1323 1508596 : && get_section () != get_alias_target ()->get_section ()
1324 83432000 : && (!get_section()
1325 0 : || !get_alias_target ()->get_section ()
1326 0 : || strcmp (get_section(),
1327 : get_alias_target ()->get_section ())))
1328 : {
1329 0 : error ("Alias and target%'s section differs");
1330 0 : get_alias_target ()->dump (stderr);
1331 0 : error_found = true;
1332 : }
1333 1449765 : if (alias && definition
1334 84880515 : && get_comdat_group () != get_alias_target ()->get_comdat_group ())
1335 : {
1336 0 : error ("Alias and target%'s comdat groups differs");
1337 0 : get_alias_target ()->dump (stderr);
1338 0 : error_found = true;
1339 : }
1340 83432000 : if (transparent_alias && definition && !weakref)
1341 : {
1342 93 : symtab_node *to = get_alias_target ();
1343 93 : const char *name1
1344 93 : = IDENTIFIER_POINTER (
1345 : ultimate_transparent_alias_target (DECL_ASSEMBLER_NAME (decl)));
1346 93 : const char *name2
1347 93 : = IDENTIFIER_POINTER (
1348 : ultimate_transparent_alias_target (DECL_ASSEMBLER_NAME (to->decl)));
1349 93 : if (!symbol_table::assembler_names_equal_p (name1, name2))
1350 : {
1351 0 : error ("Transparent alias and target%'s assembler names differs");
1352 0 : get_alias_target ()->dump (stderr);
1353 0 : error_found = true;
1354 : }
1355 : }
1356 1442 : if (transparent_alias && definition
1357 83432192 : && get_alias_target()->transparent_alias && get_alias_target()->analyzed)
1358 : {
1359 0 : error ("Chained transparent aliases");
1360 0 : get_alias_target ()->dump (stderr);
1361 0 : error_found = true;
1362 : }
1363 :
1364 83432000 : return error_found;
1365 : }
1366 :
1367 : /* Verify consistency of NODE. */
1368 :
1369 : DEBUG_FUNCTION void
1370 83434350 : symtab_node::verify (void)
1371 : {
1372 83434350 : if (seen_error ())
1373 : return;
1374 :
1375 83432000 : timevar_push (TV_CGRAPH_VERIFY);
1376 83432000 : if (cgraph_node *node = dyn_cast <cgraph_node *> (this))
1377 51577431 : node->verify_node ();
1378 : else
1379 31854569 : if (verify_base ())
1380 : {
1381 0 : debug ();
1382 0 : internal_error ("symtab_node::verify failed");
1383 : }
1384 83432000 : timevar_pop (TV_CGRAPH_VERIFY);
1385 : }
1386 :
1387 : /* Return true and set *DATA to true if NODE is an ifunc resolver. */
1388 :
1389 : static bool
1390 5497971 : check_ifunc_resolver (cgraph_node *node, void *data)
1391 : {
1392 5497971 : if (node->ifunc_resolver)
1393 : {
1394 428 : bool *is_ifunc_resolver = (bool *) data;
1395 428 : *is_ifunc_resolver = true;
1396 428 : return true;
1397 : }
1398 : return false;
1399 : }
1400 :
1401 : static bitmap ifunc_ref_map;
1402 :
1403 : /* Return true if any caller of NODE is an ifunc resolver. */
1404 :
1405 : static bool
1406 5151967 : is_caller_ifunc_resolver (cgraph_node *node)
1407 : {
1408 5151967 : bool is_ifunc_resolver = false;
1409 :
1410 15215406 : for (cgraph_edge *e = node->callers; e; e = e->next_caller)
1411 : {
1412 : /* Return true if caller is known to be an IFUNC resolver. */
1413 10063753 : if (e->caller->called_by_ifunc_resolver)
1414 : return true;
1415 :
1416 : /* Check for recursive call. */
1417 10063586 : if (e->caller == node)
1418 11345 : continue;
1419 :
1420 : /* Skip if it has been visited. */
1421 10052241 : unsigned int uid = e->caller->get_uid ();
1422 10052241 : if (!bitmap_set_bit (ifunc_ref_map, uid))
1423 8146652 : continue;
1424 :
1425 1905589 : if (is_caller_ifunc_resolver (e->caller))
1426 : {
1427 : /* Return true if caller is an IFUNC resolver. */
1428 22 : e->caller->called_by_ifunc_resolver = true;
1429 22 : return true;
1430 : }
1431 :
1432 : /* Check if caller's alias is an IFUNC resolver. */
1433 1905567 : e->caller->call_for_symbol_and_aliases (check_ifunc_resolver,
1434 : &is_ifunc_resolver,
1435 : true);
1436 1905567 : if (is_ifunc_resolver)
1437 : {
1438 : /* Return true if caller's alias is an IFUNC resolver. */
1439 125 : e->caller->called_by_ifunc_resolver = true;
1440 125 : return true;
1441 : }
1442 : }
1443 :
1444 : return false;
1445 : }
1446 :
1447 : /* Check symbol table for callees of IFUNC resolvers. */
1448 :
1449 : void
1450 244693 : symtab_node::check_ifunc_callee_symtab_nodes (void)
1451 : {
1452 244693 : symtab_node *node;
1453 :
1454 244693 : bitmap_obstack_initialize (NULL);
1455 244693 : ifunc_ref_map = BITMAP_ALLOC (NULL);
1456 :
1457 8720247 : FOR_EACH_SYMBOL (node)
1458 : {
1459 8475554 : cgraph_node *cnode = dyn_cast <cgraph_node *> (node);
1460 8475554 : if (!cnode)
1461 5228873 : continue;
1462 :
1463 5152270 : unsigned int uid = cnode->get_uid ();
1464 5152270 : if (bitmap_bit_p (ifunc_ref_map, uid))
1465 1905589 : continue;
1466 3246681 : bitmap_set_bit (ifunc_ref_map, uid);
1467 :
1468 3246681 : bool is_ifunc_resolver = false;
1469 3246681 : cnode->call_for_symbol_and_aliases (check_ifunc_resolver,
1470 : &is_ifunc_resolver, true);
1471 3246681 : if (is_ifunc_resolver || is_caller_ifunc_resolver (cnode))
1472 595 : cnode->called_by_ifunc_resolver = true;
1473 : }
1474 :
1475 244693 : BITMAP_FREE (ifunc_ref_map);
1476 244693 : bitmap_obstack_release (NULL);
1477 244693 : }
1478 :
1479 : /* Verify symbol table for internal consistency. */
1480 :
1481 : DEBUG_FUNCTION void
1482 2186148 : symtab_node::verify_symtab_nodes (void)
1483 : {
1484 2186148 : symtab_node *node;
1485 2186148 : hash_map<tree, symtab_node *> comdat_head_map (251);
1486 2186148 : asm_node *anode;
1487 :
1488 2186148 : for (anode = symtab->first_asm_symbol ();
1489 2303737 : anode;
1490 117589 : anode = safe_as_a<asm_node*>(anode->next))
1491 117589 : if (anode->order < 0 || anode->order >= symtab->order)
1492 : {
1493 0 : error ("invalid order in asm node %i", anode->order);
1494 0 : internal_error ("symtab_node::verify failed");
1495 : }
1496 :
1497 75142806 : FOR_EACH_SYMBOL (node)
1498 : {
1499 72956658 : node->verify ();
1500 72956658 : if (node->get_comdat_group ())
1501 : {
1502 10557952 : symtab_node **entry, *s;
1503 10557952 : bool existed;
1504 :
1505 10557952 : entry = &comdat_head_map.get_or_insert (node->get_comdat_group (),
1506 : &existed);
1507 10557952 : if (!existed)
1508 9256263 : *entry = node;
1509 1301689 : else if (!DECL_EXTERNAL (node->decl))
1510 : {
1511 1301544 : for (s = (*entry)->same_comdat_group;
1512 2441215 : s != NULL && s != node && s != *entry;
1513 1139671 : s = s->same_comdat_group)
1514 : ;
1515 1301544 : if (!s || s == *entry)
1516 : {
1517 0 : error ("Two symbols with same comdat_group are not linked by "
1518 : "the same_comdat_group list.");
1519 0 : (*entry)->debug ();
1520 0 : node->debug ();
1521 0 : internal_error ("symtab_node::verify failed");
1522 : }
1523 : }
1524 : }
1525 : }
1526 2186148 : }
1527 :
1528 : #if __GNUC__ >= 10
1529 : # pragma GCC diagnostic pop
1530 : #endif
1531 :
1532 : /* Make DECL local. FIXME: We shouldn't need to mess with rtl this early,
1533 : but other code such as notice_global_symbol generates rtl. */
1534 :
1535 : void
1536 3658590 : symtab_node::make_decl_local (void)
1537 : {
1538 3658590 : rtx rtl, symbol;
1539 :
1540 3658590 : if (weakref)
1541 : {
1542 0 : weakref = false;
1543 0 : IDENTIFIER_TRANSPARENT_ALIAS (DECL_ASSEMBLER_NAME (decl)) = 0;
1544 0 : TREE_CHAIN (DECL_ASSEMBLER_NAME (decl)) = NULL_TREE;
1545 0 : symtab->change_decl_assembler_name
1546 0 : (decl, DECL_ASSEMBLER_NAME (get_alias_target ()->decl));
1547 0 : DECL_ATTRIBUTES (decl) = remove_attribute ("weakref",
1548 0 : DECL_ATTRIBUTES (decl));
1549 : }
1550 : /* Avoid clearing comdat_groups on comdat-local decls. */
1551 3658590 : else if (TREE_PUBLIC (decl) == 0)
1552 3658576 : return;
1553 :
1554 : /* Localizing a symbol also make all its transparent aliases local. */
1555 : ipa_ref *ref;
1556 102405 : for (unsigned i = 0; iterate_direct_aliases (i, ref); i++)
1557 : {
1558 1789 : struct symtab_node *alias = ref->referring;
1559 1789 : if (alias->transparent_alias)
1560 5 : alias->make_decl_local ();
1561 : }
1562 :
1563 100616 : if (VAR_P (decl))
1564 : {
1565 12547 : DECL_COMMON (decl) = 0;
1566 : /* ADDRESSABLE flag is not defined for public symbols. */
1567 12547 : TREE_ADDRESSABLE (decl) = 1;
1568 12547 : TREE_STATIC (decl) = 1;
1569 : }
1570 : else
1571 88069 : gcc_assert (TREE_CODE (decl) == FUNCTION_DECL);
1572 :
1573 100616 : DECL_COMDAT (decl) = 0;
1574 100616 : DECL_WEAK (decl) = 0;
1575 100616 : DECL_EXTERNAL (decl) = 0;
1576 100616 : DECL_VISIBILITY_SPECIFIED (decl) = 0;
1577 100616 : DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
1578 100616 : TREE_PUBLIC (decl) = 0;
1579 100616 : DECL_DLLIMPORT_P (decl) = 0;
1580 100616 : if (!DECL_RTL_SET_P (decl))
1581 : return;
1582 :
1583 : /* Update rtl flags. */
1584 14 : make_decl_rtl (decl);
1585 :
1586 14 : rtl = DECL_RTL (decl);
1587 14 : if (!MEM_P (rtl))
1588 : return;
1589 :
1590 14 : symbol = XEXP (rtl, 0);
1591 14 : if (GET_CODE (symbol) != SYMBOL_REF)
1592 : return;
1593 :
1594 14 : SYMBOL_REF_WEAK (symbol) = DECL_WEAK (decl);
1595 : }
1596 :
1597 : /* Copy visibility from N.
1598 : This is useful when THIS becomes a transparent alias of N. */
1599 :
1600 : void
1601 0 : symtab_node::copy_visibility_from (symtab_node *n)
1602 : {
1603 0 : gcc_checking_assert (n->weakref == weakref);
1604 :
1605 : ipa_ref *ref;
1606 0 : for (unsigned i = 0; iterate_direct_aliases (i, ref); i++)
1607 : {
1608 0 : struct symtab_node *alias = ref->referring;
1609 0 : if (alias->transparent_alias)
1610 0 : alias->copy_visibility_from (n);
1611 : }
1612 :
1613 0 : if (VAR_P (decl))
1614 : {
1615 0 : DECL_COMMON (decl) = DECL_COMMON (n->decl);
1616 : /* ADDRESSABLE flag is not defined for public symbols. */
1617 0 : if (TREE_PUBLIC (decl) && !TREE_PUBLIC (n->decl))
1618 0 : TREE_ADDRESSABLE (decl) = 1;
1619 0 : TREE_STATIC (decl) = TREE_STATIC (n->decl);
1620 : }
1621 0 : else gcc_assert (TREE_CODE (decl) == FUNCTION_DECL);
1622 :
1623 0 : DECL_COMDAT (decl) = DECL_COMDAT (n->decl);
1624 0 : DECL_WEAK (decl) = DECL_WEAK (n->decl);
1625 0 : DECL_EXTERNAL (decl) = DECL_EXTERNAL (n->decl);
1626 0 : DECL_VISIBILITY_SPECIFIED (decl) = DECL_VISIBILITY_SPECIFIED (n->decl);
1627 0 : DECL_VISIBILITY (decl) = DECL_VISIBILITY (n->decl);
1628 0 : TREE_PUBLIC (decl) = TREE_PUBLIC (n->decl);
1629 0 : DECL_DLLIMPORT_P (decl) = DECL_DLLIMPORT_P (n->decl);
1630 0 : resolution = n->resolution;
1631 0 : set_comdat_group (n->get_comdat_group ());
1632 0 : set_section (*n);
1633 0 : externally_visible = n->externally_visible;
1634 0 : if (!DECL_RTL_SET_P (decl))
1635 0 : return;
1636 :
1637 : /* Update rtl flags. */
1638 0 : make_decl_rtl (decl);
1639 :
1640 0 : rtx rtl = DECL_RTL (decl);
1641 0 : if (!MEM_P (rtl))
1642 : return;
1643 :
1644 0 : rtx symbol = XEXP (rtl, 0);
1645 0 : if (GET_CODE (symbol) != SYMBOL_REF)
1646 : return;
1647 :
1648 0 : SYMBOL_REF_WEAK (symbol) = DECL_WEAK (decl);
1649 : }
1650 :
1651 : /* Walk the alias chain to return the symbol NODE is alias of.
1652 : If NODE is not an alias, return NODE.
1653 : Assumes NODE is known to be alias. */
1654 :
1655 : symtab_node *
1656 35934180 : symtab_node::ultimate_alias_target_1 (enum availability *availability,
1657 : symtab_node *ref)
1658 : {
1659 35934180 : bool transparent_p = false;
1660 :
1661 : /* To determine visibility of the target, we follow ELF semantic of aliases.
1662 : Here alias is an alternative assembler name of a given definition. Its
1663 : availability prevails the availability of its target (i.e. static alias of
1664 : weak definition is available.
1665 :
1666 : Transparent alias is just alternative name of a given symbol used within
1667 : one compilation unit and is translated prior hitting the object file. It
1668 : inherits the visibility of its target.
1669 : Weakref is a different animal (and noweak definition is weak).
1670 :
1671 : If we ever get into supporting targets with different semantics, a target
1672 : hook will be needed here. */
1673 :
1674 35934180 : if (availability)
1675 : {
1676 11581308 : transparent_p = transparent_alias;
1677 11581308 : if (!transparent_p)
1678 11575446 : *availability = get_availability (ref);
1679 : else
1680 5862 : *availability = AVAIL_NOT_AVAILABLE;
1681 : }
1682 :
1683 : symtab_node *node = this;
1684 71859690 : while (node)
1685 : {
1686 71859690 : if (node->alias && node->analyzed)
1687 35925510 : node = node->get_alias_target ();
1688 : else
1689 : {
1690 35934180 : if (!availability || (!transparent_p && node->analyzed))
1691 : ;
1692 37344 : else if (node->analyzed && !node->transparent_alias)
1693 308 : *availability = node->get_availability (ref);
1694 : else
1695 37036 : *availability = AVAIL_NOT_AVAILABLE;
1696 35934180 : return node;
1697 : }
1698 35925510 : if (node && availability && transparent_p
1699 448 : && node->transparent_alias)
1700 : {
1701 22 : *availability = node->get_availability (ref);
1702 22 : transparent_p = false;
1703 : }
1704 : }
1705 0 : if (availability)
1706 0 : *availability = AVAIL_NOT_AVAILABLE;
1707 : return NULL;
1708 : }
1709 :
1710 : /* C++ FE sometimes change linkage flags after producing same body aliases.
1711 :
1712 : FIXME: C++ produce implicit aliases for virtual functions and vtables that
1713 : are obviously equivalent. The way it is doing so is however somewhat
1714 : kludgy and interferes with the visibility code. As a result we need to
1715 : copy the visibility from the target to get things right. */
1716 :
1717 : void
1718 8927176 : symtab_node::fixup_same_cpp_alias_visibility (symtab_node *target)
1719 : {
1720 8927176 : if (is_a <cgraph_node *> (this))
1721 : {
1722 26781348 : DECL_DECLARED_INLINE_P (decl)
1723 8927116 : = DECL_DECLARED_INLINE_P (target->decl);
1724 26781348 : DECL_DISREGARD_INLINE_LIMITS (decl)
1725 8927116 : = DECL_DISREGARD_INLINE_LIMITS (target->decl);
1726 : }
1727 : /* FIXME: It is not really clear why those flags should not be copied for
1728 : functions, too. */
1729 : else
1730 : {
1731 60 : DECL_WEAK (decl) = DECL_WEAK (target->decl);
1732 60 : DECL_EXTERNAL (decl) = DECL_EXTERNAL (target->decl);
1733 60 : DECL_VISIBILITY (decl) = DECL_VISIBILITY (target->decl);
1734 : }
1735 8927176 : if (TREE_PUBLIC (decl))
1736 : {
1737 8906131 : tree group;
1738 :
1739 8906131 : DECL_EXTERNAL (decl) = DECL_EXTERNAL (target->decl);
1740 8906131 : DECL_COMDAT (decl) = DECL_COMDAT (target->decl);
1741 8906131 : group = target->get_comdat_group ();
1742 8906131 : set_comdat_group (group);
1743 8906131 : if (group && !same_comdat_group)
1744 0 : add_to_same_comdat_group (target);
1745 : }
1746 8927176 : externally_visible = target->externally_visible;
1747 8927176 : }
1748 :
1749 : /* Set section, do not recurse into aliases.
1750 : When one wants to change section of a symbol and its aliases,
1751 : use set_section. */
1752 :
1753 : void
1754 150209783 : symtab_node::set_section_for_node (const char *section)
1755 : {
1756 150209783 : const char *current = get_section ();
1757 :
1758 150209783 : if (current == section
1759 1866055 : || (current && section
1760 0 : && !strcmp (current, section)))
1761 : return;
1762 :
1763 1866055 : release_section_hash_entry (x_section);
1764 1866055 : if (!section)
1765 : {
1766 27107 : x_section = NULL;
1767 27107 : implicit_section = false;
1768 27107 : return;
1769 : }
1770 1838948 : if (!symtab->section_hash)
1771 35719 : symtab->section_hash = hash_table<section_name_hasher>::create_ggc (10);
1772 1838948 : section_hash_entry **slot = symtab->section_hash->find_slot_with_hash
1773 1838948 : (section, htab_hash_string (section), INSERT);
1774 1838948 : if (*slot)
1775 40553 : x_section = retain_section_hash_entry (*slot);
1776 : else
1777 : {
1778 1798395 : int len = strlen (section);
1779 1798395 : *slot = x_section = ggc_cleared_alloc<section_hash_entry> ();
1780 1798395 : x_section->ref_count = 1;
1781 1798395 : x_section->name = ggc_vec_alloc<char> (len + 1);
1782 1798395 : memcpy (x_section->name, section, len + 1);
1783 : }
1784 : }
1785 :
1786 : /* Set the section of node THIS to be the same as the section
1787 : of node OTHER. Keep reference counts of the sections
1788 : up-to-date as needed. */
1789 :
1790 : void
1791 26273308 : symtab_node::set_section_for_node (const symtab_node &other)
1792 : {
1793 26273308 : if (x_section == other.x_section)
1794 : return;
1795 7398 : if (get_section () && other.get_section ())
1796 580 : gcc_checking_assert (strcmp (get_section (), other.get_section ()) != 0);
1797 6818 : release_section_hash_entry (x_section);
1798 6818 : if (other.x_section)
1799 6810 : x_section = retain_section_hash_entry (other.x_section);
1800 : else
1801 : {
1802 8 : x_section = NULL;
1803 8 : implicit_section = false;
1804 : }
1805 : }
1806 :
1807 : /* Workers for set_section. */
1808 :
1809 : bool
1810 1845393 : symtab_node::set_section_from_string (symtab_node *n, void *s)
1811 : {
1812 1845393 : n->set_section_for_node ((char *)s);
1813 1845393 : return false;
1814 : }
1815 :
1816 : /* Set the section of node N to be the same as the section
1817 : of node O. */
1818 :
1819 : bool
1820 26273308 : symtab_node::set_section_from_node (symtab_node *n, void *o)
1821 : {
1822 26273308 : const symtab_node &other = *static_cast<const symtab_node *> (o);
1823 26273308 : n->set_section_for_node (other);
1824 26273308 : return false;
1825 : }
1826 :
1827 : /* Set section of symbol and its aliases. */
1828 :
1829 : void
1830 1803396 : symtab_node::set_section (const char *section)
1831 : {
1832 1803396 : gcc_assert (!this->alias || !this->analyzed);
1833 1803396 : call_for_symbol_and_aliases
1834 1803396 : (symtab_node::set_section_from_string, const_cast<char *>(section), true);
1835 1803396 : }
1836 :
1837 : void
1838 26273059 : symtab_node::set_section (const symtab_node &other)
1839 : {
1840 26273059 : call_for_symbol_and_aliases
1841 26273059 : (symtab_node::set_section_from_node, const_cast<symtab_node *>(&other), true);
1842 26273059 : }
1843 :
1844 : /* Return the initialization priority. */
1845 :
1846 : priority_type
1847 46505 : symtab_node::get_init_priority ()
1848 : {
1849 46505 : if (!this->in_init_priority_hash)
1850 : return DEFAULT_INIT_PRIORITY;
1851 :
1852 3799 : symbol_priority_map *h = symtab->init_priority_hash->get (this);
1853 3799 : return h ? h->init : DEFAULT_INIT_PRIORITY;
1854 : }
1855 :
1856 : /* Return the finalization priority. */
1857 :
1858 : priority_type
1859 1909 : cgraph_node::get_fini_priority ()
1860 : {
1861 1909 : if (!this->in_init_priority_hash)
1862 : return DEFAULT_INIT_PRIORITY;
1863 1831 : symbol_priority_map *h = symtab->init_priority_hash->get (this);
1864 1831 : return h ? h->fini : DEFAULT_INIT_PRIORITY;
1865 : }
1866 :
1867 : /* Return the initialization and finalization priority information for
1868 : DECL. If there is no previous priority information, a freshly
1869 : allocated structure is returned. */
1870 :
1871 : symbol_priority_map *
1872 5227 : symtab_node::priority_info (void)
1873 : {
1874 5227 : if (!symtab->init_priority_hash)
1875 3447 : symtab->init_priority_hash = hash_map<symtab_node *, symbol_priority_map>::create_ggc (13);
1876 :
1877 5227 : bool existed;
1878 5227 : symbol_priority_map *h
1879 5227 : = &symtab->init_priority_hash->get_or_insert (this, &existed);
1880 5227 : if (!existed)
1881 : {
1882 5205 : h->init = DEFAULT_INIT_PRIORITY;
1883 5205 : h->fini = DEFAULT_INIT_PRIORITY;
1884 5205 : in_init_priority_hash = true;
1885 : }
1886 :
1887 5227 : return h;
1888 : }
1889 :
1890 : /* Set initialization priority to PRIORITY. */
1891 :
1892 : void
1893 25322 : symtab_node::set_init_priority (priority_type priority)
1894 : {
1895 25322 : symbol_priority_map *h;
1896 :
1897 25322 : if (is_a <cgraph_node *> (this))
1898 25277 : gcc_assert (DECL_STATIC_CONSTRUCTOR (this->decl));
1899 :
1900 25322 : if (priority == DEFAULT_INIT_PRIORITY
1901 25322 : && get_init_priority() == priority)
1902 : return;
1903 3601 : h = priority_info ();
1904 3601 : h->init = priority;
1905 : }
1906 :
1907 : /* Set finalization priority to PRIORITY. */
1908 :
1909 : void
1910 1639 : cgraph_node::set_fini_priority (priority_type priority)
1911 : {
1912 1639 : symbol_priority_map *h;
1913 :
1914 1639 : gcc_assert (DECL_STATIC_DESTRUCTOR (this->decl));
1915 :
1916 1639 : if (priority == DEFAULT_INIT_PRIORITY
1917 1639 : && get_fini_priority() == priority)
1918 : return;
1919 1626 : h = priority_info ();
1920 1626 : h->fini = priority;
1921 : }
1922 :
1923 : /* Worker for symtab_resolve_alias. */
1924 :
1925 : bool
1926 3140 : symtab_node::set_implicit_section (symtab_node *n,
1927 : void *data ATTRIBUTE_UNUSED)
1928 : {
1929 3140 : n->implicit_section = true;
1930 3140 : return false;
1931 : }
1932 :
1933 : /* Add reference recording that symtab node is alias of TARGET.
1934 : The function can fail in the case of aliasing cycles; in this case
1935 : it returns false. */
1936 :
1937 : bool
1938 8625976 : symtab_node::resolve_alias (symtab_node *target, bool transparent)
1939 : {
1940 8625976 : symtab_node *n;
1941 :
1942 8625976 : gcc_assert (!analyzed && !ref_list.references.length ());
1943 :
1944 : /* Never let cycles to creep into the symbol table alias references;
1945 : those will make alias walkers to be infinite. */
1946 8630200 : for (n = target; n && n->alias;
1947 4438 : n = n->analyzed ? n->get_alias_target () : NULL)
1948 4440 : if (n == this)
1949 : {
1950 2 : if (is_a <cgraph_node *> (this))
1951 2 : error ("function %q+D part of alias cycle", decl);
1952 0 : else if (is_a <varpool_node *> (this))
1953 0 : error ("variable %q+D part of alias cycle", decl);
1954 : else
1955 0 : gcc_unreachable ();
1956 2 : alias = false;
1957 2 : return false;
1958 : }
1959 :
1960 : /* "analyze" the node - i.e. mark the reference. */
1961 8625974 : definition = true;
1962 8625974 : alias = true;
1963 8625974 : analyzed = true;
1964 8625974 : transparent |= transparent_alias;
1965 8625974 : transparent_alias = transparent;
1966 8625974 : if (transparent)
1967 54 : while (target->transparent_alias && target->analyzed)
1968 0 : target = target->get_alias_target ();
1969 8625974 : create_reference (target, IPA_REF_ALIAS, NULL);
1970 :
1971 : /* Add alias into the comdat group of its target unless it is already there. */
1972 8625974 : if (same_comdat_group)
1973 3998331 : remove_from_same_comdat_group ();
1974 8625974 : set_comdat_group (NULL);
1975 8625974 : if (target->get_comdat_group ())
1976 8437259 : add_to_same_comdat_group (target);
1977 :
1978 8625987 : if ((get_section () != target->get_section ()
1979 8625979 : || target->get_comdat_group ()) && get_section () && !implicit_section)
1980 : {
1981 2 : error ("section of alias %q+D must match section of its target", decl);
1982 : }
1983 8625974 : set_section (*target);
1984 8625974 : if (target->implicit_section)
1985 2954 : call_for_symbol_and_aliases (set_implicit_section, NULL, true);
1986 :
1987 : /* Alias targets become redundant after alias is resolved into an reference.
1988 : We do not want to keep it around or we would have to mind updating them
1989 : when renaming symbols. */
1990 8625974 : alias_target = NULL;
1991 :
1992 8625974 : if (!transparent && cpp_implicit_alias && symtab->state >= CONSTRUCTION)
1993 17306 : fixup_same_cpp_alias_visibility (target);
1994 :
1995 : /* If alias has address taken, so does the target. */
1996 8625974 : if (address_taken)
1997 973 : target->ultimate_alias_target ()->address_taken = true;
1998 :
1999 : /* All non-transparent aliases of THIS are now in fact aliases of TARGET.
2000 : If alias is transparent, also all transparent aliases of THIS are now
2001 : aliases of TARGET.
2002 : Also merge same comdat group lists. */
2003 : ipa_ref *ref;
2004 8626223 : for (unsigned i = 0; iterate_direct_aliases (i, ref);)
2005 : {
2006 249 : struct symtab_node *alias_alias = ref->referring;
2007 249 : if (alias_alias->get_comdat_group ())
2008 : {
2009 184 : alias_alias->remove_from_same_comdat_group ();
2010 184 : alias_alias->set_comdat_group (NULL);
2011 184 : if (target->get_comdat_group ())
2012 184 : alias_alias->add_to_same_comdat_group (target);
2013 : }
2014 249 : if ((!alias_alias->transparent_alias
2015 237 : && !alias_alias->symver)
2016 12 : || transparent)
2017 : {
2018 249 : alias_alias->remove_all_references ();
2019 249 : alias_alias->create_reference (target, IPA_REF_ALIAS, NULL);
2020 : }
2021 0 : else i++;
2022 : }
2023 : return true;
2024 : }
2025 :
2026 : /* Worker searching noninterposable alias. */
2027 :
2028 : bool
2029 61504 : symtab_node::noninterposable_alias (symtab_node *node, void *data)
2030 : {
2031 61504 : if (!node->transparent_alias && decl_binds_to_current_def_p (node->decl))
2032 : {
2033 59226 : symtab_node *fn = node->ultimate_alias_target ();
2034 :
2035 : /* Ensure that the alias is well formed this may not be the case
2036 : of user defined aliases and currently it is not always the case
2037 : of C++ same body aliases (that is a bug). */
2038 59226 : if (TREE_TYPE (node->decl) != TREE_TYPE (fn->decl)
2039 59226 : || DECL_CONTEXT (node->decl) != DECL_CONTEXT (fn->decl)
2040 59226 : || (TREE_CODE (node->decl) == FUNCTION_DECL
2041 118452 : && flags_from_decl_or_type (node->decl)
2042 59226 : != flags_from_decl_or_type (fn->decl))
2043 118434 : || DECL_ATTRIBUTES (node->decl) != DECL_ATTRIBUTES (fn->decl))
2044 20 : return false;
2045 59206 : *(symtab_node **)data = node;
2046 59206 : return true;
2047 : }
2048 : return false;
2049 : }
2050 :
2051 : /* If node cannot be overwriten by static or dynamic linker to point to
2052 : different definition, return NODE. Otherwise look for alias with such
2053 : property and if none exists, introduce new one. */
2054 :
2055 : symtab_node *
2056 60205 : symtab_node::noninterposable_alias (void)
2057 : {
2058 60205 : tree new_decl;
2059 60205 : symtab_node *new_node = NULL;
2060 :
2061 : /* First try to look up existing alias or base object
2062 : (if that is already non-overwritable). */
2063 60205 : symtab_node *node = ultimate_alias_target ();
2064 60205 : gcc_assert (!node->alias && !node->weakref);
2065 60205 : node->call_for_symbol_and_aliases (symtab_node::noninterposable_alias,
2066 : (void *)&new_node, true);
2067 60205 : if (new_node)
2068 : return new_node;
2069 :
2070 : /* If aliases aren't supported by the assembler, fail. */
2071 999 : if (!TARGET_SUPPORTS_ALIASES)
2072 : return NULL;
2073 999 : else if (lookup_attribute ("target_clones", DECL_ATTRIBUTES (node->decl)))
2074 : return NULL;
2075 :
2076 : /* Otherwise create a new one. */
2077 998 : new_decl = copy_node (node->decl);
2078 998 : DECL_DLLIMPORT_P (new_decl) = 0;
2079 998 : tree name = clone_function_name (node->decl, "localalias");
2080 998 : if (!flag_wpa)
2081 : {
2082 : unsigned long num = 0;
2083 : /* In the rare case we already have a localalias, but the above
2084 : node->call_for_symbol_and_aliases call didn't find any suitable,
2085 : iterate until we find one not used yet. */
2086 992 : while (symtab_node::get_for_asmname (name))
2087 0 : name = clone_function_name (node->decl, "localalias", num++);
2088 : }
2089 998 : DECL_NAME (new_decl) = name;
2090 998 : if (TREE_CODE (new_decl) == FUNCTION_DECL)
2091 996 : DECL_STRUCT_FUNCTION (new_decl) = NULL;
2092 998 : DECL_INITIAL (new_decl) = NULL;
2093 998 : SET_DECL_ASSEMBLER_NAME (new_decl, DECL_NAME (new_decl));
2094 998 : SET_DECL_RTL (new_decl, NULL);
2095 :
2096 : /* Update the properties. */
2097 998 : DECL_EXTERNAL (new_decl) = 0;
2098 998 : TREE_PUBLIC (new_decl) = 0;
2099 998 : DECL_COMDAT (new_decl) = 0;
2100 998 : DECL_WEAK (new_decl) = 0;
2101 :
2102 : /* Since the aliases can be added to vtables, keep DECL_VIRTUAL flag. */
2103 998 : DECL_VIRTUAL_P (new_decl) = DECL_VIRTUAL_P (node->decl);
2104 998 : if (TREE_CODE (new_decl) == FUNCTION_DECL)
2105 : {
2106 996 : DECL_STATIC_CONSTRUCTOR (new_decl) = 0;
2107 996 : DECL_STATIC_DESTRUCTOR (new_decl) = 0;
2108 996 : new_node = cgraph_node::create_alias (new_decl, node->decl);
2109 :
2110 1992 : cgraph_node *new_cnode = dyn_cast <cgraph_node *> (new_node),
2111 996 : *cnode = dyn_cast <cgraph_node *> (node);
2112 :
2113 996 : new_cnode->unit_id = cnode->unit_id;
2114 996 : new_cnode->merged_comdat = cnode->merged_comdat;
2115 996 : new_cnode->merged_extern_inline = cnode->merged_extern_inline;
2116 : }
2117 : else
2118 : {
2119 2 : TREE_READONLY (new_decl) = TREE_READONLY (node->decl);
2120 2 : DECL_INITIAL (new_decl) = error_mark_node;
2121 2 : new_node = varpool_node::create_alias (new_decl, node->decl);
2122 : }
2123 998 : new_node->resolve_alias (node);
2124 998 : gcc_assert (decl_binds_to_current_def_p (new_decl)
2125 : && targetm.binds_local_p (new_decl));
2126 998 : return new_node;
2127 : }
2128 :
2129 : /* Return true if symtab node and TARGET represents
2130 : semantically equivalent symbols. */
2131 :
2132 : bool
2133 348578 : symtab_node::semantically_equivalent_p (symtab_node *target)
2134 : {
2135 348578 : enum availability avail;
2136 348578 : symtab_node *ba;
2137 348578 : symtab_node *bb;
2138 :
2139 : /* Equivalent functions are equivalent. */
2140 348578 : if (decl == target->decl)
2141 : return true;
2142 :
2143 : /* If symbol is not overwritable by different implementation,
2144 : walk to the base object it defines. */
2145 263720 : ba = ultimate_alias_target (&avail);
2146 263720 : if (avail >= AVAIL_AVAILABLE)
2147 : {
2148 49346 : if (target == ba)
2149 : return true;
2150 : }
2151 : else
2152 : ba = this;
2153 263704 : bb = target->ultimate_alias_target (&avail);
2154 263704 : if (avail >= AVAIL_AVAILABLE)
2155 : {
2156 48789 : if (this == bb)
2157 : return true;
2158 : }
2159 : else
2160 : bb = target;
2161 263645 : return bb == ba;
2162 : }
2163 :
2164 : /* Classify symbol symtab node for partitioning. */
2165 :
2166 : enum symbol_partitioning_class
2167 2298137 : symtab_node::get_partitioning_class (void)
2168 : {
2169 : /* Inline clones are always duplicated.
2170 : This include external declarations. */
2171 2298137 : cgraph_node *cnode = dyn_cast <cgraph_node *> (this);
2172 :
2173 2298137 : if (DECL_ABSTRACT_P (decl))
2174 : return SYMBOL_EXTERNAL;
2175 :
2176 2298137 : if (cnode && cnode->inlined_to)
2177 : return SYMBOL_DUPLICATE;
2178 :
2179 : /* Transparent aliases are always duplicated. */
2180 2234354 : if (transparent_alias)
2181 66 : return definition ? SYMBOL_DUPLICATE : SYMBOL_EXTERNAL;
2182 :
2183 : /* External declarations are external. */
2184 2234288 : if (DECL_EXTERNAL (decl))
2185 : return SYMBOL_EXTERNAL;
2186 :
2187 : /* Even static aliases of external functions as external. Those can happen
2188 : when COMDAT got resolved to non-IL implementation. */
2189 2074669 : if (alias && DECL_EXTERNAL (ultimate_alias_target ()->decl))
2190 : return SYMBOL_EXTERNAL;
2191 :
2192 2074669 : if (varpool_node *vnode = dyn_cast <varpool_node *> (this))
2193 : {
2194 935713 : if (alias && definition && !ultimate_alias_target ()->definition)
2195 : return SYMBOL_EXTERNAL;
2196 : /* Constant pool references use local symbol names that cannot
2197 : be promoted global. We should never put into a constant pool
2198 : objects that cannot be duplicated across partitions. */
2199 935713 : if (DECL_IN_CONSTANT_POOL (decl))
2200 : return SYMBOL_DUPLICATE;
2201 935523 : if (DECL_HARD_REGISTER (decl))
2202 : return SYMBOL_DUPLICATE;
2203 935427 : gcc_checking_assert (vnode->definition);
2204 : }
2205 : /* Functions that are cloned may stay in callgraph even if they are unused.
2206 : Handle them as external; compute_ltrans_boundary take care to make
2207 : proper things to happen (i.e. to make them appear in the boundary but
2208 : with body streamed, so clone can me materialized). */
2209 1138956 : else if (!dyn_cast <cgraph_node *> (this)->function_symbol ()->definition)
2210 : return SYMBOL_EXTERNAL;
2211 :
2212 : /* Linker discardable symbols are duplicated to every use unless they are
2213 : keyed. */
2214 2084623 : if (DECL_ONE_ONLY (decl)
2215 13960 : && !force_output
2216 13916 : && !forced_by_abi
2217 2082953 : && !used_from_object_file_p ())
2218 : return SYMBOL_DUPLICATE;
2219 :
2220 : return SYMBOL_PARTITION;
2221 : }
2222 :
2223 : /* Return true when symbol is known to be non-zero, assume that
2224 : flag_delete_null_pointer_checks is equal to delete_null_pointer_checks. */
2225 :
2226 : bool
2227 14401733 : symtab_node::nonzero_address (bool delete_null_pointer_checks)
2228 : {
2229 : /* Weakrefs may be NULL when their target is not defined. */
2230 14401733 : if (alias && weakref)
2231 : {
2232 2746 : if (analyzed)
2233 : {
2234 188 : symtab_node *target = ultimate_alias_target ();
2235 :
2236 188 : if (target->alias && target->weakref)
2237 : return false;
2238 : /* We cannot recurse to target::nonzero. It is possible that the
2239 : target is used only via the alias.
2240 : We may walk references and look for strong use, but we do not know
2241 : if this strong use will survive to final binary, so be
2242 : conservative here.
2243 : ??? Maybe we could do the lookup during late optimization that
2244 : could be useful to eliminate the NULL pointer checks in LTO
2245 : programs. */
2246 0 : if (target->definition && !DECL_EXTERNAL (target->decl))
2247 : return true;
2248 0 : if (target->resolution != LDPR_UNKNOWN
2249 : && target->resolution != LDPR_UNDEF
2250 0 : && !target->can_be_discarded_p ()
2251 0 : && delete_null_pointer_checks)
2252 : return true;
2253 0 : return false;
2254 : }
2255 : else
2256 : return false;
2257 : }
2258 :
2259 : /* With !flag_delete_null_pointer_checks we assume that symbols may
2260 : bind to NULL. This is on by default on embedded targets only.
2261 :
2262 : Otherwise all non-WEAK symbols must be defined and thus non-NULL or
2263 : linking fails. Important case of WEAK we want to do well are comdats,
2264 : which also must be defined somewhere.
2265 :
2266 : When parsing, beware the cases when WEAK attribute is added later. */
2267 18153054 : if ((!DECL_WEAK (decl) || DECL_COMDAT (decl))
2268 15399893 : && delete_null_pointer_checks)
2269 : {
2270 11635216 : refuse_visibility_changes = true;
2271 11635216 : return true;
2272 : }
2273 :
2274 : /* If target is defined and not extern, we know it will be
2275 : output and thus it will bind to non-NULL.
2276 : Play safe for flag_delete_null_pointer_checks where weak definition may
2277 : be re-defined by NULL. */
2278 2738688 : if (definition && !DECL_EXTERNAL (decl)
2279 5502458 : && (delete_null_pointer_checks || !DECL_WEAK (decl)))
2280 : {
2281 2737970 : if (!DECL_WEAK (decl))
2282 9110 : refuse_visibility_changes = true;
2283 2737970 : return true;
2284 : }
2285 :
2286 : /* As the last resort, check the resolution info. */
2287 25801 : if (resolution != LDPR_UNKNOWN
2288 : && resolution != LDPR_UNDEF
2289 0 : && !can_be_discarded_p ()
2290 25801 : && delete_null_pointer_checks)
2291 : return true;
2292 : return false;
2293 : }
2294 :
2295 : /* Return true when symbol is known to be non-zero. */
2296 :
2297 : bool
2298 14400872 : symtab_node::nonzero_address ()
2299 : {
2300 14400872 : return nonzero_address (flag_delete_null_pointer_checks);
2301 : }
2302 :
2303 : /* Return 0 if symbol is known to have different address than S2,
2304 : Return 1 if symbol is known to have same address as S2,
2305 : return -1 otherwise.
2306 :
2307 : If MEMORY_ACCESSED is true, assume that both memory pointer to THIS
2308 : and S2 is going to be accessed. This eliminates the situations when
2309 : either THIS or S2 is NULL and is useful for comparing bases when deciding
2310 : about memory aliasing. */
2311 : int
2312 85741544 : symtab_node::equal_address_to (symtab_node *s2, bool memory_accessed)
2313 : {
2314 85741544 : enum availability avail1, avail2;
2315 :
2316 : /* A Shortcut: equivalent symbols are always equivalent. */
2317 85741544 : if (this == s2)
2318 : return 1;
2319 :
2320 : /* Unwind transparent aliases first; those are always equal to their
2321 : target. */
2322 85213847 : if (this->transparent_alias && this->analyzed)
2323 0 : return this->get_alias_target ()->equal_address_to (s2);
2324 85213847 : while (s2->transparent_alias && s2->analyzed)
2325 0 : s2 = s2->get_alias_target();
2326 :
2327 85213847 : if (this == s2)
2328 : return 1;
2329 :
2330 : /* For non-interposable aliases, lookup and compare their actual definitions.
2331 : Also check if the symbol needs to bind to given definition. */
2332 85213847 : symtab_node *rs1 = ultimate_alias_target (&avail1);
2333 85213847 : symtab_node *rs2 = s2->ultimate_alias_target (&avail2);
2334 85213847 : bool binds_local1 = rs1->analyzed && decl_binds_to_current_def_p (this->decl);
2335 85213847 : bool binds_local2 = rs2->analyzed && decl_binds_to_current_def_p (s2->decl);
2336 85213847 : bool really_binds_local1 = binds_local1;
2337 85213847 : bool really_binds_local2 = binds_local2;
2338 :
2339 : /* Addresses of vtables and virtual functions cannot be used by user
2340 : code and are used only within speculation. In this case we may make
2341 : symbol equivalent to its alias even if interposition may break this
2342 : rule. Doing so will allow us to turn speculative inlining into
2343 : non-speculative more aggressively. */
2344 85213847 : if (DECL_VIRTUAL_P (this->decl) && avail1 >= AVAIL_AVAILABLE)
2345 : binds_local1 = true;
2346 85213847 : if (DECL_VIRTUAL_P (s2->decl) && avail2 >= AVAIL_AVAILABLE)
2347 85213847 : binds_local2 = true;
2348 :
2349 : /* If both definitions are available we know that even if they are bound
2350 : to other unit they must be defined same way and therefore we can use
2351 : equivalence test. */
2352 85213847 : if (rs1 != rs2 && avail1 >= AVAIL_AVAILABLE && avail2 >= AVAIL_AVAILABLE)
2353 : binds_local1 = binds_local2 = true;
2354 :
2355 85213847 : if (binds_local1 && binds_local2 && rs1 == rs2)
2356 : {
2357 : /* We made use of the fact that alias is not weak. */
2358 358 : if (rs1 != this)
2359 232 : refuse_visibility_changes = true;
2360 358 : if (rs2 != s2)
2361 126 : s2->refuse_visibility_changes = true;
2362 358 : return 1;
2363 : }
2364 :
2365 : /* If both symbols may resolve to NULL, we cannot really prove them
2366 : different. */
2367 85213489 : if (!memory_accessed && !nonzero_address () && !s2->nonzero_address ())
2368 : return -1;
2369 :
2370 : /* Except for NULL, functions and variables never overlap. */
2371 85213430 : if (TREE_CODE (decl) != TREE_CODE (s2->decl))
2372 : return 0;
2373 :
2374 : /* If one of the symbols is unresolved alias, punt. */
2375 85042269 : if (rs1->alias || rs2->alias)
2376 : return -1;
2377 :
2378 : /* If we have a non-interposable definition of at least one of the symbols
2379 : and the other symbol is different, we know other unit cannot interpose
2380 : it to the first symbol; all aliases of the definition needs to be
2381 : present in the current unit. */
2382 85042261 : if (((really_binds_local1 || really_binds_local2)
2383 : /* If we have both definitions and they are different, we know they
2384 : will be different even in units they binds to. */
2385 11543687 : || (binds_local1 && binds_local2))
2386 73582972 : && rs1 != rs2)
2387 : {
2388 : /* We make use of the fact that one symbol is not alias of the other
2389 : and that the definition is non-interposable. */
2390 73582879 : refuse_visibility_changes = true;
2391 73582879 : s2->refuse_visibility_changes = true;
2392 73582879 : rs1->refuse_visibility_changes = true;
2393 73582879 : rs2->refuse_visibility_changes = true;
2394 73582879 : return 0;
2395 : }
2396 :
2397 11459382 : if (rs1 == rs2)
2398 : return -1;
2399 :
2400 : /* If the FE tells us at least one of the decls will never be aliased nor
2401 : overlapping with other vars in some other way, return 0. */
2402 11459289 : if (VAR_P (decl)
2403 11459289 : && (lookup_attribute ("non overlapping", DECL_ATTRIBUTES (decl))
2404 11455333 : || lookup_attribute ("non overlapping", DECL_ATTRIBUTES (s2->decl))))
2405 3929 : return 0;
2406 :
2407 : /* TODO: Alias oracle basically assume that addresses of global variables
2408 : are different unless they are declared as alias of one to another while
2409 : the code folding comparisons doesn't.
2410 : We probably should be consistent and use this fact here, too, but for
2411 : the moment return false only when we are called from the alias oracle.
2412 : Return 0 in C constant initializers and C++ manifestly constant
2413 : expressions, the likelyhood that different vars will be aliases is
2414 : small and returning -1 lets us reject too many initializers. */
2415 11455360 : if (memory_accessed || folding_initializer)
2416 : return 0;
2417 :
2418 : return -1;
2419 : }
2420 :
2421 : /* Worker for call_for_symbol_and_aliases. */
2422 :
2423 : bool
2424 145053 : symtab_node::call_for_symbol_and_aliases_1 (bool (*callback) (symtab_node *,
2425 : void *),
2426 : void *data,
2427 : bool include_overwritable)
2428 : {
2429 145053 : ipa_ref *ref;
2430 314954 : FOR_EACH_ALIAS (this, ref)
2431 : {
2432 171180 : symtab_node *alias = ref->referring;
2433 171180 : if (include_overwritable
2434 171180 : || alias->get_availability () > AVAIL_INTERPOSABLE)
2435 171180 : if (alias->call_for_symbol_and_aliases (callback, data,
2436 : include_overwritable))
2437 : return true;
2438 : }
2439 : return false;
2440 : }
2441 :
2442 : /* Return true if address of N is possibly compared. */
2443 :
2444 : static bool
2445 612081 : address_matters_1 (symtab_node *n, void *)
2446 : {
2447 612081 : struct ipa_ref *ref;
2448 :
2449 612081 : if (!n->address_can_be_compared_p ())
2450 : return false;
2451 600314 : if (n->externally_visible || n->force_output || n->ref_by_asm)
2452 : return true;
2453 :
2454 506207 : for (unsigned int i = 0; n->iterate_referring (i, ref); i++)
2455 447420 : if (ref->address_matters_p ())
2456 : return true;
2457 : return false;
2458 : }
2459 :
2460 : /* Return true if symbol's address may possibly be compared to other
2461 : symbol's address. */
2462 :
2463 : bool
2464 585382 : symtab_node::address_matters_p ()
2465 : {
2466 585382 : gcc_assert (!alias);
2467 585382 : return call_for_symbol_and_aliases (address_matters_1, NULL, true);
2468 : }
2469 :
2470 : /* Return true if symbol's alignment may be increased. */
2471 :
2472 : bool
2473 30061 : symtab_node::can_increase_alignment_p (void)
2474 : {
2475 30061 : symtab_node *target = ultimate_alias_target ();
2476 :
2477 : /* For now support only variables. */
2478 30061 : if (!VAR_P (decl))
2479 : return false;
2480 :
2481 : /* With -fno-toplevel-reorder we may have already output the constant. */
2482 30061 : if (TREE_ASM_WRITTEN (target->decl))
2483 : return false;
2484 :
2485 : /* If target is already placed in an anchor, we cannot touch its
2486 : alignment. */
2487 29374 : if (DECL_RTL_SET_P (target->decl)
2488 14217 : && MEM_P (DECL_RTL (target->decl))
2489 43591 : && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (DECL_RTL (target->decl), 0)))
2490 : return false;
2491 :
2492 : /* Constant pool entries may be shared. */
2493 29374 : if (DECL_IN_CONSTANT_POOL (target->decl))
2494 : return false;
2495 :
2496 : /* We cannot change alignment of symbols that may bind to symbols
2497 : in other translation unit that may contain a definition with lower
2498 : alignment. */
2499 27252 : if (!decl_binds_to_current_def_p (decl))
2500 : return false;
2501 :
2502 : /* When compiling partition, be sure the symbol is not output by other
2503 : partition. */
2504 17143 : if (flag_ltrans
2505 17143 : && (target->in_other_partition
2506 265 : || target->get_partitioning_class () == SYMBOL_DUPLICATE))
2507 0 : return false;
2508 :
2509 : /* Do not override the alignment as specified by the ABI when the used
2510 : attribute is set. */
2511 17143 : if (DECL_PRESERVE_P (decl) || DECL_PRESERVE_P (target->decl))
2512 : return false;
2513 :
2514 : /* Do not override explicit alignment set by the user when an explicit
2515 : section name is also used. This is a common idiom used by many
2516 : software projects. */
2517 17143 : if (DECL_SECTION_NAME (target->decl) != NULL && !target->implicit_section)
2518 : return false;
2519 :
2520 : return true;
2521 : }
2522 :
2523 : /* Worker for symtab_node::increase_alignment. */
2524 :
2525 : static bool
2526 5160 : increase_alignment_1 (symtab_node *n, void *v)
2527 : {
2528 5160 : unsigned int align = (size_t)v;
2529 5160 : if (DECL_ALIGN (n->decl) < align
2530 5160 : && n->can_increase_alignment_p ())
2531 : {
2532 4006 : SET_DECL_ALIGN (n->decl, align);
2533 4006 : DECL_USER_ALIGN (n->decl) = 1;
2534 : }
2535 5160 : return false;
2536 : }
2537 :
2538 : /* Increase alignment of THIS to ALIGN. */
2539 :
2540 : void
2541 4612 : symtab_node::increase_alignment (unsigned int align)
2542 : {
2543 4612 : gcc_assert (can_increase_alignment_p () && align <= MAX_OFILE_ALIGNMENT);
2544 4612 : ultimate_alias_target()->call_for_symbol_and_aliases (increase_alignment_1,
2545 4612 : (void *)(size_t) align,
2546 : true);
2547 4612 : gcc_assert (DECL_ALIGN (decl) >= align);
2548 4612 : }
2549 :
2550 : /* Helper for symtab_node::definition_alignment. */
2551 :
2552 : static bool
2553 1699876 : get_alignment_1 (symtab_node *n, void *v)
2554 : {
2555 1699876 : *((unsigned int *)v) = MAX (*((unsigned int *)v), DECL_ALIGN (n->decl));
2556 1699876 : return false;
2557 : }
2558 :
2559 : /* Return desired alignment of the definition. This is NOT alignment useful
2560 : to access THIS, because THIS may be interposable and DECL_ALIGN should
2561 : be used instead. It however must be guaranteed when output definition
2562 : of THIS. */
2563 :
2564 : unsigned int
2565 1640038 : symtab_node::definition_alignment ()
2566 : {
2567 1640038 : unsigned int align = 0;
2568 1640038 : gcc_assert (!alias);
2569 1640038 : call_for_symbol_and_aliases (get_alignment_1, &align, true);
2570 1640038 : return align;
2571 : }
2572 :
2573 : /* Return symbol used to separate symbol name from suffix. */
2574 :
2575 : char
2576 307024 : symbol_table::symbol_suffix_separator ()
2577 : {
2578 : #ifndef NO_DOT_IN_LABEL
2579 307024 : return '.';
2580 : #elif !defined NO_DOLLAR_IN_LABEL
2581 : return '$';
2582 : #else
2583 : return '_';
2584 : #endif
2585 : }
2586 :
2587 : /* Return true when references to this symbol from REF must bind to current
2588 : definition in final executable. */
2589 :
2590 : bool
2591 95601839 : symtab_node::binds_to_current_def_p (symtab_node *ref)
2592 : {
2593 95601839 : if (!definition && !in_other_partition)
2594 : return false;
2595 47006569 : if (transparent_alias)
2596 13 : return definition
2597 13 : && get_alias_target()->binds_to_current_def_p (ref);
2598 47006556 : cgraph_node *cnode = dyn_cast <cgraph_node *> (this);
2599 47006556 : if (cnode && cnode->ifunc_resolver)
2600 : return false;
2601 47006456 : if (decl_binds_to_current_def_p (decl))
2602 : return true;
2603 :
2604 : /* Inline clones always binds locally. */
2605 22147554 : if (cnode && cnode->inlined_to)
2606 : return true;
2607 :
2608 22122681 : if (DECL_EXTERNAL (decl))
2609 : return false;
2610 :
2611 19684282 : gcc_assert (externally_visible);
2612 :
2613 19684282 : if (ref)
2614 : {
2615 139247 : cgraph_node *cref = dyn_cast <cgraph_node *> (ref);
2616 139247 : if (cref)
2617 139247 : ref = cref->inlined_to;
2618 : }
2619 :
2620 : /* If this is a reference from symbol itself and there are no aliases, we
2621 : may be sure that the symbol was not interposed by something else because
2622 : the symbol itself would be unreachable otherwise. This is important
2623 : to optimize recursive functions well.
2624 :
2625 : This assumption may be broken by inlining: if symbol is interposable
2626 : but the body is available (i.e. declared inline), inliner may make
2627 : the body reachable even with interposition. */
2628 479 : if (this == ref && !has_aliases_p ()
2629 139649 : && (!cnode
2630 402 : || symtab->state >= IPA_SSA_AFTER_INLINING
2631 0 : || get_availability () >= AVAIL_INTERPOSABLE))
2632 402 : return true;
2633 :
2634 :
2635 : /* References within one comdat group are always bound in a group. */
2636 19683880 : if (ref
2637 70577 : && symtab->state >= IPA_SSA_AFTER_INLINING
2638 70577 : && get_comdat_group ()
2639 19754453 : && get_comdat_group () == ref->get_comdat_group ())
2640 : return true;
2641 :
2642 : return false;
2643 : }
2644 :
2645 : /* Return true if symbol should be output to the symbol table. */
2646 :
2647 : bool
2648 1196672 : symtab_node::output_to_lto_symbol_table_p (void)
2649 : {
2650 : /* Only externally visible symbols matter. */
2651 1196672 : if (!TREE_PUBLIC (decl))
2652 : return false;
2653 1126356 : if (!real_symbol_p ())
2654 : return false;
2655 : /* FIXME: variables probably should not be considered as real symbols at
2656 : first place. */
2657 1126356 : if (VAR_P (decl) && DECL_HARD_REGISTER (decl))
2658 : return false;
2659 658532 : if (TREE_CODE (decl) == FUNCTION_DECL && !definition
2660 1591862 : && fndecl_built_in_p (decl))
2661 : {
2662 : /* Builtins like those for most math functions have actual implementations
2663 : in libraries so make sure to output references into the symbol table to
2664 : make those libraries referenced. Note this is incomplete handling for
2665 : now and only covers math functions. */
2666 41574 : return builtin_with_linkage_p (decl);
2667 : }
2668 :
2669 : /* We have real symbol that should be in symbol table. However try to trim
2670 : down the references to libraries bit more because linker will otherwise
2671 : bring unnecessary object files into the final link.
2672 : FIXME: The following checks can easily be confused i.e. by self recursive
2673 : function or self-referring variable. */
2674 :
2675 : /* We keep external functions in symtab for sake of inlining
2676 : and devirtualization. We do not want to see them in symbol table as
2677 : references unless they are really used. */
2678 1084758 : cgraph_node *cnode = dyn_cast <cgraph_node *> (this);
2679 616958 : if (cnode && (!definition || DECL_EXTERNAL (decl))
2680 424186 : && cnode->callers)
2681 : return true;
2682 :
2683 : /* Ignore all references from external vars initializers - they are not really
2684 : part of the compilation unit until they are used by folding. Some symbols,
2685 : like references to external construction vtables cannot be referred to at
2686 : all. We decide this at can_refer_decl_in_current_unit_p. */
2687 1062480 : if (!definition || DECL_EXTERNAL (decl))
2688 : {
2689 : int i;
2690 : struct ipa_ref *ref;
2691 408478 : for (i = 0; iterate_referring (i, ref); i++)
2692 : {
2693 408432 : if (ref->use == IPA_REF_ALIAS)
2694 36 : continue;
2695 816838 : if (is_a <cgraph_node *> (ref->referring))
2696 : return true;
2697 403094 : if (!DECL_EXTERNAL (ref->referring->decl))
2698 : return true;
2699 : }
2700 : return false;
2701 : }
2702 : return true;
2703 : }
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