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0704fb2e | 1 | /* Symbol table. |
2 | Copyright (C) 2012 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 "tm.h" | |
25 | #include "tree.h" | |
26 | #include "tree-inline.h" | |
18841b0c | 27 | #include "langhooks.h" |
0704fb2e | 28 | #include "hashtab.h" |
cfbe30aa | 29 | #include "ggc.h" |
0704fb2e | 30 | #include "cgraph.h" |
cfbe30aa | 31 | #include "diagnostic.h" |
3e7775f6 | 32 | #include "timevar.h" |
cf951b1a | 33 | #include "lto-streamer.h" |
34 | #include "rtl.h" | |
35 | ||
36 | const char * const ld_plugin_symbol_resolution_names[]= | |
37 | { | |
38 | "", | |
39 | "undef", | |
40 | "prevailing_def", | |
41 | "prevailing_def_ironly", | |
42 | "preempted_reg", | |
43 | "preempted_ir", | |
44 | "resolved_ir", | |
45 | "resolved_exec", | |
46 | "resolved_dyn", | |
47 | "prevailing_def_ironly_exp" | |
48 | }; | |
cfbe30aa | 49 | |
50 | /* Hash table used to convert declarations into nodes. */ | |
51 | static GTY((param_is (union symtab_node_def))) htab_t symtab_hash; | |
52 | /* Hash table used to convert assembler names into nodes. */ | |
53 | static GTY((param_is (union symtab_node_def))) htab_t assembler_name_hash; | |
0704fb2e | 54 | |
55 | /* Linked list of symbol table nodes. */ | |
56 | symtab_node symtab_nodes; | |
57 | ||
58 | /* The order index of the next symtab node to be created. This is | |
59 | used so that we can sort the cgraph nodes in order by when we saw | |
60 | them, to support -fno-toplevel-reorder. */ | |
61 | int symtab_order; | |
62 | ||
cfbe30aa | 63 | /* Returns a hash code for P. */ |
64 | ||
65 | static hashval_t | |
66 | hash_node (const void *p) | |
67 | { | |
68 | const_symtab_node n = (const_symtab_node ) p; | |
69 | return (hashval_t) DECL_UID (n->symbol.decl); | |
70 | } | |
71 | ||
72 | ||
73 | /* Returns nonzero if P1 and P2 are equal. */ | |
74 | ||
75 | static int | |
76 | eq_node (const void *p1, const void *p2) | |
77 | { | |
78 | const_symtab_node n1 = (const_symtab_node) p1; | |
79 | const_symtab_node n2 = (const_symtab_node) p2; | |
80 | return DECL_UID (n1->symbol.decl) == DECL_UID (n2->symbol.decl); | |
81 | } | |
82 | ||
83 | /* Returns a hash code for P. */ | |
84 | ||
85 | static hashval_t | |
86 | hash_node_by_assembler_name (const void *p) | |
87 | { | |
88 | const_symtab_node n = (const_symtab_node) p; | |
89 | return (hashval_t) decl_assembler_name_hash (DECL_ASSEMBLER_NAME (n->symbol.decl)); | |
90 | } | |
91 | ||
92 | /* Returns nonzero if P1 and P2 are equal. */ | |
93 | ||
94 | static int | |
95 | eq_assembler_name (const void *p1, const void *p2) | |
96 | { | |
97 | const_symtab_node n1 = (const_symtab_node) p1; | |
98 | const_tree name = (const_tree)p2; | |
99 | return (decl_assembler_name_equal (n1->symbol.decl, name)); | |
100 | } | |
101 | ||
102 | /* Insert NODE to assembler name hash. */ | |
103 | ||
104 | static void | |
105 | insert_to_assembler_name_hash (symtab_node node) | |
106 | { | |
107 | gcc_checking_assert (!node->symbol.previous_sharing_asm_name | |
108 | && !node->symbol.next_sharing_asm_name); | |
109 | if (assembler_name_hash) | |
110 | { | |
111 | void **aslot; | |
112 | tree name = DECL_ASSEMBLER_NAME (node->symbol.decl); | |
113 | ||
114 | aslot = htab_find_slot_with_hash (assembler_name_hash, name, | |
115 | decl_assembler_name_hash (name), | |
116 | INSERT); | |
117 | gcc_assert (*aslot != node); | |
118 | node->symbol.next_sharing_asm_name = (symtab_node)*aslot; | |
119 | if (*aslot != NULL) | |
120 | ((symtab_node)*aslot)->symbol.previous_sharing_asm_name = node; | |
121 | *aslot = node; | |
122 | } | |
123 | ||
124 | } | |
125 | ||
126 | /* Remove NODE from assembler name hash. */ | |
127 | ||
128 | static void | |
129 | unlink_from_assembler_name_hash (symtab_node node) | |
130 | { | |
131 | if (assembler_name_hash) | |
132 | { | |
133 | if (node->symbol.next_sharing_asm_name) | |
134 | node->symbol.next_sharing_asm_name->symbol.previous_sharing_asm_name | |
135 | = node->symbol.previous_sharing_asm_name; | |
136 | if (node->symbol.previous_sharing_asm_name) | |
137 | { | |
138 | node->symbol.previous_sharing_asm_name->symbol.next_sharing_asm_name | |
139 | = node->symbol.next_sharing_asm_name; | |
140 | } | |
141 | else | |
142 | { | |
143 | tree name = DECL_ASSEMBLER_NAME (node->symbol.decl); | |
144 | void **slot; | |
145 | slot = htab_find_slot_with_hash (assembler_name_hash, name, | |
146 | decl_assembler_name_hash (name), | |
147 | NO_INSERT); | |
148 | gcc_assert (*slot == node); | |
149 | if (!node->symbol.next_sharing_asm_name) | |
150 | htab_clear_slot (assembler_name_hash, slot); | |
151 | else | |
152 | *slot = node->symbol.next_sharing_asm_name; | |
153 | } | |
154 | } | |
155 | } | |
156 | ||
157 | ||
0704fb2e | 158 | /* Add node into symbol table. This function is not used directly, but via |
159 | cgraph/varpool node creation routines. */ | |
160 | ||
161 | void | |
162 | symtab_register_node (symtab_node node) | |
163 | { | |
cfbe30aa | 164 | struct symtab_node_base key; |
165 | symtab_node *slot; | |
166 | ||
0704fb2e | 167 | node->symbol.next = symtab_nodes; |
168 | node->symbol.previous = NULL; | |
169 | if (symtab_nodes) | |
170 | symtab_nodes->symbol.previous = node; | |
171 | symtab_nodes = node; | |
172 | ||
cfbe30aa | 173 | if (!symtab_hash) |
174 | symtab_hash = htab_create_ggc (10, hash_node, eq_node, NULL); | |
175 | key.decl = node->symbol.decl; | |
176 | slot = (symtab_node *) htab_find_slot (symtab_hash, &key, INSERT); | |
177 | if (*slot == NULL) | |
178 | *slot = node; | |
179 | ||
ad0fe105 | 180 | ipa_empty_ref_list (&node->symbol.ref_list); |
cfbe30aa | 181 | |
0704fb2e | 182 | node->symbol.order = symtab_order++; |
183 | ||
ad0fe105 | 184 | /* Be sure to do this last; C++ FE might create new nodes via |
185 | DECL_ASSEMBLER_NAME langhook! */ | |
186 | insert_to_assembler_name_hash (node); | |
0704fb2e | 187 | } |
188 | ||
cfbe30aa | 189 | /* Make NODE to be the one symtab hash is pointing to. Used when reshaping tree |
190 | of inline clones. */ | |
191 | ||
192 | void | |
193 | symtab_insert_node_to_hashtable (symtab_node node) | |
194 | { | |
195 | struct symtab_node_base key; | |
196 | symtab_node *slot; | |
197 | ||
198 | if (!symtab_hash) | |
199 | symtab_hash = htab_create_ggc (10, hash_node, eq_node, NULL); | |
200 | key.decl = node->symbol.decl; | |
201 | slot = (symtab_node *) htab_find_slot (symtab_hash, &key, INSERT); | |
202 | *slot = node; | |
203 | } | |
204 | ||
0704fb2e | 205 | /* Remove node from symbol table. This function is not used directly, but via |
206 | cgraph/varpool node removal routines. */ | |
207 | ||
208 | void | |
209 | symtab_unregister_node (symtab_node node) | |
210 | { | |
cfbe30aa | 211 | void **slot; |
0704fb2e | 212 | ipa_remove_all_references (&node->symbol.ref_list); |
04ec15fa | 213 | ipa_remove_all_referring (&node->symbol.ref_list); |
0704fb2e | 214 | |
215 | if (node->symbol.same_comdat_group) | |
216 | { | |
217 | symtab_node prev; | |
218 | for (prev = node->symbol.same_comdat_group; | |
219 | prev->symbol.same_comdat_group != node; | |
220 | prev = prev->symbol.same_comdat_group) | |
221 | ; | |
222 | if (node->symbol.same_comdat_group == prev) | |
223 | prev->symbol.same_comdat_group = NULL; | |
224 | else | |
225 | prev->symbol.same_comdat_group = node->symbol.same_comdat_group; | |
226 | node->symbol.same_comdat_group = NULL; | |
227 | } | |
228 | ||
229 | if (node->symbol.previous) | |
230 | node->symbol.previous->symbol.next = node->symbol.next; | |
231 | else | |
232 | symtab_nodes = node->symbol.next; | |
233 | if (node->symbol.next) | |
234 | node->symbol.next->symbol.previous = node->symbol.previous; | |
235 | node->symbol.next = NULL; | |
236 | node->symbol.previous = NULL; | |
cfbe30aa | 237 | |
238 | slot = htab_find_slot (symtab_hash, node, NO_INSERT); | |
239 | if (*slot == node) | |
240 | { | |
241 | symtab_node replacement_node = NULL; | |
242 | if (symtab_function_p (node)) | |
243 | replacement_node = (symtab_node)cgraph_find_replacement_node (cgraph (node)); | |
244 | if (!replacement_node) | |
245 | htab_clear_slot (symtab_hash, slot); | |
246 | else | |
247 | *slot = replacement_node; | |
248 | } | |
249 | unlink_from_assembler_name_hash (node); | |
250 | } | |
251 | ||
252 | /* Return symbol table node associated with DECL, if any, | |
253 | and NULL otherwise. */ | |
254 | ||
255 | symtab_node | |
256 | symtab_get_node (const_tree decl) | |
257 | { | |
258 | symtab_node *slot; | |
259 | struct symtab_node_base key; | |
260 | ||
261 | gcc_checking_assert (TREE_CODE (decl) == FUNCTION_DECL | |
262 | || (TREE_CODE (decl) == VAR_DECL | |
263 | && (TREE_STATIC (decl) || DECL_EXTERNAL (decl) | |
264 | || in_lto_p))); | |
265 | ||
266 | if (!symtab_hash) | |
267 | return NULL; | |
268 | ||
269 | key.decl = CONST_CAST2 (tree, const_tree, decl); | |
270 | ||
271 | slot = (symtab_node *) htab_find_slot (symtab_hash, &key, | |
272 | NO_INSERT); | |
273 | ||
274 | if (slot) | |
275 | return *slot; | |
276 | return NULL; | |
0704fb2e | 277 | } |
278 | ||
279 | /* Remove symtab NODE from the symbol table. */ | |
280 | ||
281 | void | |
282 | symtab_remove_node (symtab_node node) | |
283 | { | |
284 | if (symtab_function_p (node)) | |
285 | cgraph_remove_node (cgraph (node)); | |
286 | else if (symtab_variable_p (node)) | |
287 | varpool_remove_node (varpool (node)); | |
288 | } | |
cfbe30aa | 289 | |
290 | /* Return the cgraph node that has ASMNAME for its DECL_ASSEMBLER_NAME. | |
291 | Return NULL if there's no such node. */ | |
292 | ||
293 | symtab_node | |
294 | symtab_node_for_asm (const_tree asmname) | |
295 | { | |
296 | symtab_node node; | |
297 | void **slot; | |
298 | ||
299 | if (!assembler_name_hash) | |
300 | { | |
301 | assembler_name_hash = | |
302 | htab_create_ggc (10, hash_node_by_assembler_name, eq_assembler_name, | |
303 | NULL); | |
304 | FOR_EACH_SYMBOL (node) | |
305 | insert_to_assembler_name_hash (node); | |
306 | } | |
307 | ||
308 | slot = htab_find_slot_with_hash (assembler_name_hash, asmname, | |
309 | decl_assembler_name_hash (asmname), | |
310 | NO_INSERT); | |
311 | ||
312 | if (slot) | |
313 | { | |
314 | node = (symtab_node) *slot; | |
315 | return node; | |
316 | } | |
317 | return NULL; | |
318 | } | |
319 | ||
320 | /* Set the DECL_ASSEMBLER_NAME and update symtab hashtables. */ | |
321 | ||
322 | void | |
323 | change_decl_assembler_name (tree decl, tree name) | |
324 | { | |
325 | symtab_node node = NULL; | |
326 | ||
327 | /* We can have user ASM names on things, like global register variables, that | |
328 | are not in the symbol table. */ | |
329 | if ((TREE_CODE (decl) == VAR_DECL | |
330 | && (TREE_STATIC (decl) || DECL_EXTERNAL (decl))) | |
331 | || TREE_CODE (decl) == FUNCTION_DECL) | |
332 | node = symtab_get_node (decl); | |
333 | if (!DECL_ASSEMBLER_NAME_SET_P (decl)) | |
334 | { | |
335 | SET_DECL_ASSEMBLER_NAME (decl, name); | |
336 | if (node) | |
337 | insert_to_assembler_name_hash (node); | |
338 | } | |
339 | else | |
340 | { | |
341 | if (name == DECL_ASSEMBLER_NAME (decl)) | |
342 | return; | |
343 | ||
344 | if (node) | |
345 | unlink_from_assembler_name_hash (node); | |
346 | if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) | |
347 | && DECL_RTL_SET_P (decl)) | |
348 | warning (0, "%D renamed after being referenced in assembly", decl); | |
349 | ||
350 | SET_DECL_ASSEMBLER_NAME (decl, name); | |
351 | if (node) | |
352 | insert_to_assembler_name_hash (node); | |
353 | } | |
354 | } | |
355 | ||
cf951b1a | 356 | /* Add NEW_ to the same comdat group that OLD is in. */ |
357 | ||
358 | void | |
359 | symtab_add_to_same_comdat_group (symtab_node new_node, | |
360 | symtab_node old_node) | |
361 | { | |
362 | gcc_assert (DECL_ONE_ONLY (old_node->symbol.decl)); | |
363 | gcc_assert (!new_node->symbol.same_comdat_group); | |
364 | gcc_assert (new_node != old_node); | |
365 | ||
366 | DECL_COMDAT_GROUP (new_node->symbol.decl) = DECL_COMDAT_GROUP (old_node->symbol.decl); | |
367 | new_node->symbol.same_comdat_group = old_node; | |
368 | if (!old_node->symbol.same_comdat_group) | |
369 | old_node->symbol.same_comdat_group = new_node; | |
370 | else | |
371 | { | |
372 | symtab_node n; | |
373 | for (n = old_node->symbol.same_comdat_group; | |
374 | n->symbol.same_comdat_group != old_node; | |
375 | n = n->symbol.same_comdat_group) | |
376 | ; | |
377 | n->symbol.same_comdat_group = new_node; | |
378 | } | |
379 | } | |
380 | ||
381 | /* Dissolve the same_comdat_group list in which NODE resides. */ | |
382 | ||
383 | void | |
384 | symtab_dissolve_same_comdat_group_list (symtab_node node) | |
385 | { | |
386 | symtab_node n = node, next; | |
387 | ||
388 | if (!node->symbol.same_comdat_group) | |
389 | return; | |
390 | do | |
391 | { | |
392 | next = n->symbol.same_comdat_group; | |
393 | n->symbol.same_comdat_group = NULL; | |
394 | n = next; | |
395 | } | |
396 | while (n != node); | |
397 | } | |
398 | ||
18841b0c | 399 | /* Return printable assembler name of NODE. |
400 | This function is used only for debugging. When assembler name | |
401 | is unknown go with identifier name. */ | |
402 | ||
403 | const char * | |
404 | symtab_node_asm_name (symtab_node node) | |
405 | { | |
406 | if (!DECL_ASSEMBLER_NAME_SET_P (node->symbol.decl)) | |
407 | return lang_hooks.decl_printable_name (node->symbol.decl, 2); | |
408 | return IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (node->symbol.decl)); | |
409 | } | |
410 | ||
411 | /* Return printable identifier name. */ | |
412 | ||
413 | const char * | |
414 | symtab_node_name (symtab_node node) | |
415 | { | |
416 | return lang_hooks.decl_printable_name (node->symbol.decl, 2); | |
417 | } | |
418 | ||
419 | static const char * const symtab_type_names[] = {"symbol", "function", "variable"}; | |
420 | ||
421 | /* Dump base fields of symtab nodes. Not to be used directly. */ | |
422 | ||
423 | void | |
424 | dump_symtab_base (FILE *f, symtab_node node) | |
425 | { | |
426 | static const char * const visibility_types[] = { | |
427 | "default", "protected", "hidden", "internal" | |
428 | }; | |
429 | ||
430 | fprintf (f, "%s/%i (%s)", | |
431 | symtab_node_asm_name (node), | |
432 | node->symbol.order, | |
433 | symtab_node_name (node)); | |
434 | dump_addr (f, " @", (void *)node); | |
435 | fprintf (f, "\n Type: %s\n", symtab_type_names[node->symbol.type]); | |
436 | fprintf (f, " Visibility:"); | |
437 | ||
438 | if (node->symbol.in_other_partition) | |
439 | fprintf (f, " in_other_partition"); | |
440 | if (node->symbol.used_from_other_partition) | |
441 | fprintf (f, " used_from_other_partition"); | |
8efa224a | 442 | if (node->symbol.force_output) |
443 | fprintf (f, " force_output"); | |
18841b0c | 444 | if (node->symbol.resolution != LDPR_UNKNOWN) |
445 | fprintf (f, " %s", | |
446 | ld_plugin_symbol_resolution_names[(int)node->symbol.resolution]); | |
447 | if (TREE_ASM_WRITTEN (node->symbol.decl)) | |
448 | fprintf (f, " asm_written"); | |
449 | if (DECL_EXTERNAL (node->symbol.decl)) | |
450 | fprintf (f, " external"); | |
451 | if (TREE_PUBLIC (node->symbol.decl)) | |
452 | fprintf (f, " public"); | |
453 | if (DECL_COMMON (node->symbol.decl)) | |
454 | fprintf (f, " common"); | |
455 | if (DECL_WEAK (node->symbol.decl)) | |
456 | fprintf (f, " weak"); | |
457 | if (DECL_DLLIMPORT_P (node->symbol.decl)) | |
458 | fprintf (f, " dll_import"); | |
459 | if (DECL_COMDAT (node->symbol.decl)) | |
460 | fprintf (f, " comdat"); | |
461 | if (DECL_COMDAT_GROUP (node->symbol.decl)) | |
462 | fprintf (f, " comdat_group:%s", | |
463 | IDENTIFIER_POINTER (DECL_COMDAT_GROUP (node->symbol.decl))); | |
464 | if (DECL_ONE_ONLY (node->symbol.decl)) | |
465 | fprintf (f, " one_only"); | |
466 | if (DECL_SECTION_NAME (node->symbol.decl)) | |
467 | fprintf (f, " section_name:%s", | |
5300ccdd | 468 | TREE_STRING_POINTER (DECL_SECTION_NAME (node->symbol.decl))); |
18841b0c | 469 | if (DECL_VISIBILITY_SPECIFIED (node->symbol.decl)) |
470 | fprintf (f, " visibility_specified"); | |
471 | if (DECL_VISIBILITY (node->symbol.decl)) | |
472 | fprintf (f, " visibility:%s", | |
473 | visibility_types [DECL_VISIBILITY (node->symbol.decl)]); | |
474 | if (DECL_VIRTUAL_P (node->symbol.decl)) | |
475 | fprintf (f, " virtual"); | |
476 | if (DECL_ARTIFICIAL (node->symbol.decl)) | |
477 | fprintf (f, " artificial"); | |
9a2639fc | 478 | if (TREE_CODE (node->symbol.decl) == FUNCTION_DECL) |
479 | { | |
480 | if (DECL_STATIC_CONSTRUCTOR (node->symbol.decl)) | |
481 | fprintf (f, " constructor"); | |
482 | if (DECL_STATIC_DESTRUCTOR (node->symbol.decl)) | |
483 | fprintf (f, " destructor"); | |
484 | } | |
18841b0c | 485 | fprintf (f, "\n"); |
486 | ||
487 | if (node->symbol.same_comdat_group) | |
488 | fprintf (f, " Same comdat group as: %s/%i\n", | |
489 | symtab_node_asm_name (node->symbol.same_comdat_group), | |
490 | node->symbol.same_comdat_group->symbol.order); | |
491 | if (node->symbol.next_sharing_asm_name) | |
492 | fprintf (f, " next sharing asm name: %i\n", | |
cfacc26f | 493 | node->symbol.next_sharing_asm_name->symbol.order); |
18841b0c | 494 | if (node->symbol.previous_sharing_asm_name) |
495 | fprintf (f, " previous sharing asm name: %i\n", | |
cfacc26f | 496 | node->symbol.previous_sharing_asm_name->symbol.order); |
18841b0c | 497 | |
498 | if (node->symbol.address_taken) | |
cfacc26f | 499 | fprintf (f, " Address is taken.\n"); |
ff2a5ada | 500 | if (node->symbol.aux) |
501 | { | |
502 | fprintf (f, " Aux:"); | |
503 | dump_addr (f, " @", (void *)node->symbol.aux); | |
504 | } | |
18841b0c | 505 | |
506 | fprintf (f, " References: "); | |
507 | ipa_dump_references (f, &node->symbol.ref_list); | |
04ec15fa | 508 | fprintf (f, " Referring: "); |
509 | ipa_dump_referring (f, &node->symbol.ref_list); | |
18841b0c | 510 | } |
511 | ||
512 | /* Dump symtab node. */ | |
513 | ||
514 | void | |
515 | dump_symtab_node (FILE *f, symtab_node node) | |
516 | { | |
517 | if (symtab_function_p (node)) | |
518 | dump_cgraph_node (f, cgraph (node)); | |
519 | else if (symtab_variable_p (node)) | |
520 | dump_varpool_node (f, varpool (node)); | |
521 | } | |
522 | ||
523 | /* Dump symbol table. */ | |
524 | ||
525 | void | |
526 | dump_symtab (FILE *f) | |
527 | { | |
528 | symtab_node node; | |
529 | fprintf (f, "Symbol table:\n\n"); | |
530 | FOR_EACH_SYMBOL (node) | |
531 | dump_symtab_node (f, node); | |
532 | } | |
533 | ||
534 | /* Dump symtab node NODE to stderr. */ | |
535 | ||
536 | DEBUG_FUNCTION void | |
537 | debug_symtab_node (symtab_node node) | |
538 | { | |
539 | dump_symtab_node (stderr, node); | |
540 | } | |
541 | ||
542 | /* Dump symbol table to stderr. */ | |
543 | ||
544 | DEBUG_FUNCTION void | |
545 | debug_symtab (void) | |
546 | { | |
547 | dump_symtab (stderr); | |
548 | } | |
549 | ||
3e7775f6 | 550 | /* Verify common part of symtab nodes. */ |
551 | ||
552 | DEBUG_FUNCTION bool | |
553 | verify_symtab_base (symtab_node node) | |
554 | { | |
555 | bool error_found = false; | |
556 | symtab_node hashed_node; | |
557 | ||
558 | if (symtab_function_p (node)) | |
559 | { | |
560 | if (TREE_CODE (node->symbol.decl) != FUNCTION_DECL) | |
561 | { | |
562 | error ("function symbol is not function"); | |
563 | error_found = true; | |
564 | } | |
565 | } | |
566 | else if (symtab_variable_p (node)) | |
567 | { | |
568 | if (TREE_CODE (node->symbol.decl) != VAR_DECL) | |
569 | { | |
570 | error ("variable symbol is not variable"); | |
571 | error_found = true; | |
572 | } | |
573 | } | |
574 | else | |
575 | { | |
576 | error ("node has unknown type"); | |
577 | error_found = true; | |
578 | } | |
579 | ||
580 | hashed_node = symtab_get_node (node->symbol.decl); | |
581 | if (!hashed_node) | |
582 | { | |
583 | error ("node not found in symtab decl hashtable"); | |
584 | error_found = true; | |
585 | } | |
586 | if (assembler_name_hash) | |
587 | { | |
588 | hashed_node = symtab_node_for_asm (DECL_ASSEMBLER_NAME (node->symbol.decl)); | |
589 | if (hashed_node && hashed_node->symbol.previous_sharing_asm_name) | |
590 | { | |
591 | error ("assembler name hash list corrupted"); | |
592 | error_found = true; | |
593 | } | |
594 | while (hashed_node) | |
595 | { | |
596 | if (hashed_node == node) | |
597 | break; | |
598 | hashed_node = hashed_node->symbol.next_sharing_asm_name; | |
599 | } | |
600 | if (!hashed_node) | |
601 | { | |
602 | error ("node not found in symtab assembler name hash"); | |
603 | error_found = true; | |
604 | } | |
605 | } | |
606 | if (node->symbol.previous_sharing_asm_name | |
607 | && node->symbol.previous_sharing_asm_name->symbol.next_sharing_asm_name != node) | |
608 | { | |
609 | error ("double linked list of assembler names corrupted"); | |
610 | } | |
611 | if (node->symbol.same_comdat_group) | |
612 | { | |
613 | symtab_node n = node->symbol.same_comdat_group; | |
614 | ||
615 | if (!DECL_ONE_ONLY (n->symbol.decl)) | |
616 | { | |
617 | error ("non-DECL_ONE_ONLY node in a same_comdat_group list"); | |
618 | error_found = true; | |
619 | } | |
620 | if (n->symbol.type != node->symbol.type) | |
621 | { | |
622 | error ("mixing different types of symbol in same comdat groups is not supported"); | |
623 | error_found = true; | |
624 | } | |
625 | if (n == node) | |
626 | { | |
627 | error ("node is alone in a comdat group"); | |
628 | error_found = true; | |
629 | } | |
630 | do | |
631 | { | |
632 | if (!n->symbol.same_comdat_group) | |
633 | { | |
634 | error ("same_comdat_group is not a circular list"); | |
635 | error_found = true; | |
636 | break; | |
637 | } | |
638 | n = n->symbol.same_comdat_group; | |
639 | } | |
640 | while (n != node); | |
641 | } | |
642 | return error_found; | |
643 | } | |
644 | ||
645 | /* Verify consistency of NODE. */ | |
646 | ||
647 | DEBUG_FUNCTION void | |
648 | verify_symtab_node (symtab_node node) | |
649 | { | |
650 | if (seen_error ()) | |
651 | return; | |
652 | ||
653 | timevar_push (TV_CGRAPH_VERIFY); | |
654 | if (symtab_function_p (node)) | |
655 | verify_cgraph_node (cgraph (node)); | |
656 | else | |
657 | if (verify_symtab_base (node)) | |
658 | { | |
659 | dump_symtab_node (stderr, node); | |
660 | internal_error ("verify_symtab_node failed"); | |
661 | } | |
662 | timevar_pop (TV_CGRAPH_VERIFY); | |
663 | } | |
664 | ||
665 | /* Verify symbol table for internal consistency. */ | |
666 | ||
667 | DEBUG_FUNCTION void | |
668 | verify_symtab (void) | |
669 | { | |
670 | symtab_node node; | |
671 | FOR_EACH_SYMBOL (node) | |
672 | verify_symtab_node (node); | |
673 | } | |
674 | ||
cf951b1a | 675 | /* Return true when RESOLUTION indicate that linker will use |
676 | the symbol from non-LTO object files. */ | |
677 | ||
678 | bool | |
679 | resolution_used_from_other_file_p (enum ld_plugin_symbol_resolution resolution) | |
680 | { | |
681 | return (resolution == LDPR_PREVAILING_DEF | |
682 | || resolution == LDPR_PREEMPTED_REG | |
683 | || resolution == LDPR_RESOLVED_EXEC | |
684 | || resolution == LDPR_RESOLVED_DYN); | |
685 | } | |
686 | ||
687 | /* Return true when NODE is known to be used from other (non-LTO) object file. | |
688 | Known only when doing LTO via linker plugin. */ | |
689 | ||
690 | bool | |
691 | symtab_used_from_object_file_p (symtab_node node) | |
692 | { | |
693 | if (!TREE_PUBLIC (node->symbol.decl) || DECL_EXTERNAL (node->symbol.decl)) | |
694 | return false; | |
695 | if (resolution_used_from_other_file_p (node->symbol.resolution)) | |
696 | return true; | |
697 | return false; | |
698 | } | |
699 | ||
700 | /* Make DECL local. FIXME: We shouldn't need to mess with rtl this early, | |
701 | but other code such as notice_global_symbol generates rtl. */ | |
702 | void | |
703 | symtab_make_decl_local (tree decl) | |
704 | { | |
705 | rtx rtl, symbol; | |
706 | ||
707 | if (TREE_CODE (decl) == VAR_DECL) | |
708 | DECL_COMMON (decl) = 0; | |
709 | else gcc_assert (TREE_CODE (decl) == FUNCTION_DECL); | |
710 | ||
711 | if (DECL_ONE_ONLY (decl) || DECL_COMDAT (decl)) | |
712 | { | |
713 | /* It is possible that we are linking against library defining same COMDAT | |
714 | function. To avoid conflict we need to rename our local name of the | |
715 | function just in the case WHOPR partitioning decide to make it hidden | |
716 | to avoid cross partition references. */ | |
717 | if (flag_wpa) | |
718 | { | |
719 | const char *old_name; | |
720 | symtab_node node = symtab_get_node (decl); | |
721 | old_name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)); | |
722 | change_decl_assembler_name (decl, | |
723 | clone_function_name (decl, "local")); | |
724 | if (node->symbol.lto_file_data) | |
725 | lto_record_renamed_decl (node->symbol.lto_file_data, | |
726 | old_name, | |
727 | IDENTIFIER_POINTER | |
728 | (DECL_ASSEMBLER_NAME (decl))); | |
729 | } | |
730 | DECL_SECTION_NAME (decl) = 0; | |
731 | DECL_COMDAT (decl) = 0; | |
732 | } | |
733 | DECL_COMDAT_GROUP (decl) = 0; | |
734 | DECL_WEAK (decl) = 0; | |
735 | DECL_EXTERNAL (decl) = 0; | |
736 | TREE_PUBLIC (decl) = 0; | |
b6f96313 | 737 | DECL_VISIBILITY_SPECIFIED (decl) = 0; |
738 | DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT; | |
cf951b1a | 739 | if (!DECL_RTL_SET_P (decl)) |
740 | return; | |
741 | ||
742 | /* Update rtl flags. */ | |
743 | make_decl_rtl (decl); | |
744 | ||
745 | rtl = DECL_RTL (decl); | |
746 | if (!MEM_P (rtl)) | |
747 | return; | |
748 | ||
749 | symbol = XEXP (rtl, 0); | |
750 | if (GET_CODE (symbol) != SYMBOL_REF) | |
751 | return; | |
752 | ||
753 | SYMBOL_REF_WEAK (symbol) = DECL_WEAK (decl); | |
754 | } | |
cfbe30aa | 755 | #include "gt-symtab.h" |