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7f7beb3f | 1 | /* IPA visibility pass |
aeee4812 | 2 | Copyright (C) 2003-2023 Free Software Foundation, Inc. |
7f7beb3f JH |
3 | |
4 | This file is part of GCC. | |
5 | ||
6 | GCC is free software; you can redistribute it and/or modify it under | |
7 | the terms of the GNU General Public License as published by the Free | |
8 | Software Foundation; either version 3, or (at your option) any later | |
9 | version. | |
10 | ||
11 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
12 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
14 | for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GCC; see the file COPYING3. If not see | |
18 | <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | /* This file implements two related passes: | |
21 | ||
22 | - pass_data_ipa_function_and_variable_visibility run just after | |
23 | symbol table, references and callgraph are built | |
24 | ||
25 | - pass_data_ipa_function_and_variable_visibility run as first | |
26 | proper IPA pass (that is after early optimization, or, (with LTO) | |
27 | as a first pass done at link-time. | |
28 | ||
29 | Purpose of both passes is to set correctly visibility properties | |
30 | of all symbols. This includes: | |
31 | ||
32 | - Symbol privatization: | |
33 | ||
34 | Some symbols that are declared public by frontend may be | |
35 | turned local (either by -fwhole-program flag, by linker plugin feedback | |
36 | or by other reasons) | |
37 | ||
38 | - Discovery of local functions: | |
39 | ||
40 | A local function is one whose calls can occur only in the current | |
41 | compilation unit and all its calls are explicit, so we can change | |
42 | its calling convention. We simply mark all static functions whose | |
43 | address is not taken as local. | |
44 | ||
67914693 | 45 | externally_visible flag is set for symbols that cannot be privatized. |
7f7beb3f JH |
46 | For privatized symbols we clear TREE_PUBLIC flag and dismantle comdat |
47 | group. | |
48 | ||
49 | - Dismantling of comdat groups: | |
50 | ||
51 | Comdat group represent a section that may be replaced by linker by | |
52 | a different copy of the same section from other unit. | |
53 | If we have resolution information (from linker plugin) and we know that | |
54 | a given comdat gorup is prevailing, we can dismantle it and turn symbols | |
55 | into normal symbols. If the resolution information says that the | |
56 | section was previaled by copy from non-LTO code, we can also dismantle | |
57 | it and turn all symbols into external. | |
58 | ||
59 | - Local aliases: | |
60 | ||
61 | Some symbols can be interposed by dynamic linker. Refering to these | |
62 | symbols is expensive, since it needs to be overwritable by the dynamic | |
63 | linker. In some cases we know that the interposition does not change | |
64 | semantic and we can always refer to a local copy (as in the case of | |
65 | inline function). In this case we produce a local alias and redirect | |
66 | calls to it. | |
67 | ||
68 | TODO: This should be done for references, too. | |
69 | ||
70 | - Removal of static ocnstructors and destructors that have no side effects. | |
71 | ||
72 | - Regularization of several oddities introduced by frontends that may | |
73 | be impractical later in the optimization queue. */ | |
74 | ||
75 | #include "config.h" | |
76 | #include "system.h" | |
77 | #include "coretypes.h" | |
78 | #include "tm.h" | |
c582198b | 79 | #include "function.h" |
957060b5 AM |
80 | #include "tree.h" |
81 | #include "gimple-expr.h" | |
7f7beb3f | 82 | #include "tree-pass.h" |
957060b5 | 83 | #include "cgraph.h" |
7f7beb3f | 84 | #include "calls.h" |
94c2e46c | 85 | #include "varasm.h" |
325fe816 | 86 | #include "ipa-utils.h" |
314e6352 ML |
87 | #include "stringpool.h" |
88 | #include "attribs.h" | |
7f7beb3f | 89 | |
67914693 | 90 | /* Return true when NODE cannot be local. Worker for cgraph_local_node_p. */ |
7f7beb3f | 91 | |
4bd019b8 JH |
92 | static bool |
93 | non_local_p (struct cgraph_node *node, void *data ATTRIBUTE_UNUSED) | |
7f7beb3f | 94 | { |
953aad61 | 95 | return !(node->only_called_directly_or_aliased_p () |
fb81a61b | 96 | /* i386 would need update to output thunk with local calling |
036ea399 | 97 | conventions. */ |
67f3791f | 98 | && !node->thunk |
953aad61 JH |
99 | && node->definition |
100 | && !DECL_EXTERNAL (node->decl) | |
036ea399 | 101 | && !lookup_attribute ("noipa", DECL_ATTRIBUTES (node->decl)) |
953aad61 JH |
102 | && !node->externally_visible |
103 | && !node->used_from_other_partition | |
17a7218b ML |
104 | && !node->in_other_partition |
105 | && node->get_availability () >= AVAIL_AVAILABLE); | |
7f7beb3f JH |
106 | } |
107 | ||
108 | /* Return true when function can be marked local. */ | |
109 | ||
110 | bool | |
d52f5295 | 111 | cgraph_node::local_p (void) |
7f7beb3f | 112 | { |
d52f5295 | 113 | cgraph_node *n = ultimate_alias_target (); |
7f7beb3f | 114 | |
67f3791f | 115 | if (n->thunk) |
953aad61 | 116 | return n->callees->callee->local_p (); |
4bd019b8 | 117 | return !n->call_for_symbol_thunks_and_aliases (non_local_p, |
953aad61 | 118 | NULL, true); |
7f7beb3f JH |
119 | |
120 | } | |
121 | ||
7f7beb3f JH |
122 | /* A helper for comdat_can_be_unshared_p. */ |
123 | ||
124 | static bool | |
125 | comdat_can_be_unshared_p_1 (symtab_node *node) | |
126 | { | |
127 | if (!node->externally_visible) | |
128 | return true; | |
0a7246ee JH |
129 | if (node->address_can_be_compared_p ()) |
130 | { | |
131 | struct ipa_ref *ref; | |
132 | ||
133 | for (unsigned int i = 0; node->iterate_referring (i, ref); i++) | |
134 | if (ref->address_matters_p ()) | |
135 | return false; | |
136 | } | |
7f7beb3f JH |
137 | |
138 | /* If the symbol is used in some weird way, better to not touch it. */ | |
139 | if (node->force_output) | |
140 | return false; | |
141 | ||
142 | /* Explicit instantiations needs to be output when possibly | |
143 | used externally. */ | |
144 | if (node->forced_by_abi | |
145 | && TREE_PUBLIC (node->decl) | |
146 | && (node->resolution != LDPR_PREVAILING_DEF_IRONLY | |
147 | && !flag_whole_program)) | |
148 | return false; | |
149 | ||
67914693 | 150 | /* Non-readonly and volatile variables cannot be duplicated. */ |
7f7beb3f JH |
151 | if (is_a <varpool_node *> (node) |
152 | && (!TREE_READONLY (node->decl) | |
153 | || TREE_THIS_VOLATILE (node->decl))) | |
154 | return false; | |
155 | return true; | |
156 | } | |
157 | ||
158 | /* COMDAT functions must be shared only if they have address taken, | |
159 | otherwise we can produce our own private implementation with | |
160 | -fwhole-program. | |
67914693 | 161 | Return true when turning COMDAT function static cannot lead to wrong |
7f7beb3f JH |
162 | code when the resulting object links with a library defining same COMDAT. |
163 | ||
164 | Virtual functions do have their addresses taken from the vtables, | |
165 | but in C++ there is no way to compare their addresses for equality. */ | |
166 | ||
167 | static bool | |
168 | comdat_can_be_unshared_p (symtab_node *node) | |
169 | { | |
170 | if (!comdat_can_be_unshared_p_1 (node)) | |
171 | return false; | |
172 | if (node->same_comdat_group) | |
173 | { | |
174 | symtab_node *next; | |
175 | ||
176 | /* If more than one function is in the same COMDAT group, it must | |
177 | be shared even if just one function in the comdat group has | |
178 | address taken. */ | |
179 | for (next = node->same_comdat_group; | |
180 | next != node; next = next->same_comdat_group) | |
181 | if (!comdat_can_be_unshared_p_1 (next)) | |
182 | return false; | |
183 | } | |
184 | return true; | |
185 | } | |
186 | ||
187 | /* Return true when function NODE should be considered externally visible. */ | |
188 | ||
189 | static bool | |
190 | cgraph_externally_visible_p (struct cgraph_node *node, | |
191 | bool whole_program) | |
192 | { | |
71e54687 JH |
193 | while (node->transparent_alias && node->definition) |
194 | node = node->get_alias_target (); | |
7f7beb3f JH |
195 | if (!node->definition) |
196 | return false; | |
197 | if (!TREE_PUBLIC (node->decl) | |
198 | || DECL_EXTERNAL (node->decl)) | |
199 | return false; | |
200 | ||
201 | /* Do not try to localize built-in functions yet. One of problems is that we | |
202 | end up mangling their asm for WHOPR that makes it impossible to call them | |
203 | using the implicit built-in declarations anymore. Similarly this enables | |
204 | us to remove them as unreachable before actual calls may appear during | |
205 | expansion or folding. */ | |
3d78e008 | 206 | if (fndecl_built_in_p (node->decl)) |
7f7beb3f JH |
207 | return true; |
208 | ||
209 | /* If linker counts on us, we must preserve the function. */ | |
d52f5295 | 210 | if (node->used_from_object_file_p ()) |
7f7beb3f JH |
211 | return true; |
212 | if (DECL_PRESERVE_P (node->decl)) | |
213 | return true; | |
214 | if (lookup_attribute ("externally_visible", | |
215 | DECL_ATTRIBUTES (node->decl))) | |
216 | return true; | |
036ea399 JJ |
217 | if (lookup_attribute ("noipa", DECL_ATTRIBUTES (node->decl))) |
218 | return true; | |
7f7beb3f JH |
219 | if (TARGET_DLLIMPORT_DECL_ATTRIBUTES |
220 | && lookup_attribute ("dllexport", | |
221 | DECL_ATTRIBUTES (node->decl))) | |
222 | return true; | |
40ebe1fc JH |
223 | |
224 | /* Limitation of gas requires us to output targets of symver aliases as | |
225 | global symbols. This is binutils PR 25295. */ | |
226 | ipa_ref *ref; | |
227 | FOR_EACH_ALIAS (node, ref) | |
228 | if (ref->referring->symver) | |
229 | return true; | |
230 | ||
7f7beb3f JH |
231 | if (node->resolution == LDPR_PREVAILING_DEF_IRONLY) |
232 | return false; | |
8def1d52 | 233 | /* When doing LTO or whole program, we can bring COMDAT functions static. |
7f7beb3f JH |
234 | This improves code quality and we know we will duplicate them at most twice |
235 | (in the case that we are not using plugin and link with object file | |
236 | implementing same COMDAT) */ | |
1ff9ed6f | 237 | if (((in_lto_p || whole_program) && !flag_incremental_link) |
7f7beb3f JH |
238 | && DECL_COMDAT (node->decl) |
239 | && comdat_can_be_unshared_p (node)) | |
240 | return false; | |
241 | ||
242 | /* When doing link time optimizations, hidden symbols become local. */ | |
1ff9ed6f | 243 | if ((in_lto_p && !flag_incremental_link) |
7f7beb3f JH |
244 | && (DECL_VISIBILITY (node->decl) == VISIBILITY_HIDDEN |
245 | || DECL_VISIBILITY (node->decl) == VISIBILITY_INTERNAL) | |
246 | /* Be sure that node is defined in IR file, not in other object | |
247 | file. In that case we don't set used_from_other_object_file. */ | |
248 | && node->definition) | |
249 | ; | |
250 | else if (!whole_program) | |
251 | return true; | |
252 | ||
253 | if (MAIN_NAME_P (DECL_NAME (node->decl))) | |
254 | return true; | |
255 | ||
256 | return false; | |
257 | } | |
258 | ||
9041d2e6 | 259 | /* Return true when variable should be considered externally visible. */ |
7f7beb3f JH |
260 | |
261 | bool | |
9041d2e6 | 262 | varpool_node::externally_visible_p (void) |
7f7beb3f | 263 | { |
71e54687 JH |
264 | while (transparent_alias && definition) |
265 | return get_alias_target ()->externally_visible_p (); | |
9041d2e6 | 266 | if (DECL_EXTERNAL (decl)) |
7f7beb3f JH |
267 | return true; |
268 | ||
9041d2e6 | 269 | if (!TREE_PUBLIC (decl)) |
7f7beb3f JH |
270 | return false; |
271 | ||
272 | /* If linker counts on us, we must preserve the function. */ | |
9041d2e6 | 273 | if (used_from_object_file_p ()) |
7f7beb3f JH |
274 | return true; |
275 | ||
8e1ba78f JH |
276 | /* Bringing TLS variables local may cause dynamic linker failures |
277 | on limits of static TLS vars. */ | |
278 | if (DECL_THREAD_LOCAL_P (decl) | |
279 | && (DECL_TLS_MODEL (decl) != TLS_MODEL_EMULATED | |
280 | && DECL_TLS_MODEL (decl) != TLS_MODEL_INITIAL_EXEC)) | |
281 | return true; | |
282 | ||
9041d2e6 | 283 | if (DECL_HARD_REGISTER (decl)) |
7f7beb3f | 284 | return true; |
9041d2e6 | 285 | if (DECL_PRESERVE_P (decl)) |
7f7beb3f JH |
286 | return true; |
287 | if (lookup_attribute ("externally_visible", | |
9041d2e6 | 288 | DECL_ATTRIBUTES (decl))) |
7f7beb3f JH |
289 | return true; |
290 | if (TARGET_DLLIMPORT_DECL_ATTRIBUTES | |
291 | && lookup_attribute ("dllexport", | |
9041d2e6 | 292 | DECL_ATTRIBUTES (decl))) |
7f7beb3f JH |
293 | return true; |
294 | ||
40ebe1fc JH |
295 | /* Limitation of gas requires us to output targets of symver aliases as |
296 | global symbols. This is binutils PR 25295. */ | |
297 | ipa_ref *ref; | |
298 | FOR_EACH_ALIAS (this, ref) | |
299 | if (ref->referring->symver) | |
300 | return true; | |
7f7beb3f | 301 | |
9041d2e6 | 302 | if (resolution == LDPR_PREVAILING_DEF_IRONLY) |
7f7beb3f JH |
303 | return false; |
304 | ||
305 | /* As a special case, the COMDAT virtual tables can be unshared. | |
306 | In LTO mode turn vtables into static variables. The variable is readonly, | |
307 | so this does not enable more optimization, but referring static var | |
308 | is faster for dynamic linking. Also this match logic hidding vtables | |
309 | from LTO symbol tables. */ | |
1ff9ed6f | 310 | if (((in_lto_p || flag_whole_program) && !flag_incremental_link) |
9041d2e6 ML |
311 | && DECL_COMDAT (decl) |
312 | && comdat_can_be_unshared_p (this)) | |
7f7beb3f JH |
313 | return false; |
314 | ||
315 | /* When doing link time optimizations, hidden symbols become local. */ | |
1ff9ed6f | 316 | if (in_lto_p && !flag_incremental_link |
9041d2e6 ML |
317 | && (DECL_VISIBILITY (decl) == VISIBILITY_HIDDEN |
318 | || DECL_VISIBILITY (decl) == VISIBILITY_INTERNAL) | |
7f7beb3f JH |
319 | /* Be sure that node is defined in IR file, not in other object |
320 | file. In that case we don't set used_from_other_object_file. */ | |
9041d2e6 | 321 | && definition) |
7f7beb3f JH |
322 | ; |
323 | else if (!flag_whole_program) | |
324 | return true; | |
325 | ||
326 | /* Do not attempt to privatize COMDATS by default. | |
327 | This would break linking with C++ libraries sharing | |
328 | inline definitions. | |
329 | ||
330 | FIXME: We can do so for readonly vars with no address taken and | |
331 | possibly also for vtables since no direct pointer comparsion is done. | |
332 | It might be interesting to do so to reduce linking overhead. */ | |
9041d2e6 | 333 | if (DECL_COMDAT (decl) || DECL_WEAK (decl)) |
7f7beb3f JH |
334 | return true; |
335 | return false; | |
336 | } | |
337 | ||
338 | /* Return true if reference to NODE can be replaced by a local alias. | |
339 | Local aliases save dynamic linking overhead and enable more optimizations. | |
340 | */ | |
341 | ||
f95ff97f | 342 | static bool |
7f7beb3f JH |
343 | can_replace_by_local_alias (symtab_node *node) |
344 | { | |
f95ff97f | 345 | /* If aliases aren't supported, we can't do replacement. */ |
a8b522b4 ML |
346 | if (!TARGET_SUPPORTS_ALIASES) |
347 | return false; | |
348 | ||
ced7e958 JH |
349 | /* Weakrefs have a reason to be non-local. Be sure we do not replace |
350 | them. */ | |
351 | while (node->transparent_alias && node->definition && !node->weakref) | |
352 | node = node->get_alias_target (); | |
353 | if (node->weakref) | |
354 | return false; | |
355 | ||
d52f5295 | 356 | return (node->get_availability () > AVAIL_INTERPOSABLE |
94c2e46c | 357 | && !decl_binds_to_current_def_p (node->decl) |
d52f5295 | 358 | && !node->can_be_discarded_p ()); |
7f7beb3f JH |
359 | } |
360 | ||
f95ff97f | 361 | /* Return true if we can replace reference to NODE by local alias |
07990a5e JH |
362 | within a virtual table. Generally we can replace function pointers |
363 | and virtual table pointers. */ | |
364 | ||
f95ff97f | 365 | static bool |
07990a5e JH |
366 | can_replace_by_local_alias_in_vtable (symtab_node *node) |
367 | { | |
368 | if (is_a <varpool_node *> (node) | |
369 | && !DECL_VIRTUAL_P (node->decl)) | |
370 | return false; | |
371 | return can_replace_by_local_alias (node); | |
372 | } | |
373 | ||
374 | /* walk_tree callback that rewrites initializer references. */ | |
375 | ||
376 | static tree | |
0a7246ee JH |
377 | update_vtable_references (tree *tp, int *walk_subtrees, |
378 | void *data ATTRIBUTE_UNUSED) | |
07990a5e | 379 | { |
8813a647 | 380 | if (VAR_OR_FUNCTION_DECL_P (*tp)) |
07990a5e | 381 | { |
d52f5295 ML |
382 | if (can_replace_by_local_alias_in_vtable (symtab_node::get (*tp))) |
383 | *tp = symtab_node::get (*tp)->noninterposable_alias ()->decl; | |
07990a5e JH |
384 | *walk_subtrees = 0; |
385 | } | |
386 | else if (IS_TYPE_OR_DECL_P (*tp)) | |
387 | *walk_subtrees = 0; | |
388 | return NULL; | |
389 | } | |
390 | ||
7f7beb3f JH |
391 | /* In LTO we can remove COMDAT groups and weak symbols. |
392 | Either turn them into normal symbols or external symbol depending on | |
393 | resolution info. */ | |
394 | ||
395 | static void | |
396 | update_visibility_by_resolution_info (symtab_node * node) | |
397 | { | |
398 | bool define; | |
399 | ||
400 | if (!node->externally_visible | |
401 | || (!DECL_WEAK (node->decl) && !DECL_ONE_ONLY (node->decl)) | |
da66d596 | 402 | || node->resolution == LDPR_UNKNOWN) |
7f7beb3f JH |
403 | return; |
404 | ||
405 | define = (node->resolution == LDPR_PREVAILING_DEF_IRONLY | |
406 | || node->resolution == LDPR_PREVAILING_DEF | |
2e4c1e6c | 407 | || node->resolution == LDPR_UNDEF |
7f7beb3f JH |
408 | || node->resolution == LDPR_PREVAILING_DEF_IRONLY_EXP); |
409 | ||
410 | /* The linker decisions ought to agree in the whole group. */ | |
411 | if (node->same_comdat_group) | |
412 | for (symtab_node *next = node->same_comdat_group; | |
413 | next != node; next = next->same_comdat_group) | |
a9e083cc | 414 | { |
ced7e958 | 415 | if (!next->externally_visible || next->transparent_alias) |
a9e083cc TS |
416 | continue; |
417 | ||
418 | bool same_def | |
419 | = define == (next->resolution == LDPR_PREVAILING_DEF_IRONLY | |
420 | || next->resolution == LDPR_PREVAILING_DEF | |
421 | || next->resolution == LDPR_UNDEF | |
422 | || next->resolution == LDPR_PREVAILING_DEF_IRONLY_EXP); | |
423 | gcc_assert (in_lto_p || same_def); | |
424 | if (!same_def) | |
425 | return; | |
426 | } | |
7f7beb3f JH |
427 | |
428 | if (node->same_comdat_group) | |
429 | for (symtab_node *next = node->same_comdat_group; | |
430 | next != node; next = next->same_comdat_group) | |
431 | { | |
1ff9ed6f JH |
432 | /* During incremental linking we need to keep symbol weak for future |
433 | linking. We can still drop definition if we know non-LTO world | |
434 | prevails. */ | |
435 | if (!flag_incremental_link) | |
436 | { | |
437 | DECL_WEAK (next->decl) = false; | |
438 | next->set_comdat_group (NULL); | |
439 | } | |
f1703a2e | 440 | if (!define) |
1ff9ed6f | 441 | { |
f1703a2e JH |
442 | if (next->externally_visible) |
443 | DECL_EXTERNAL (next->decl) = true; | |
1ff9ed6f JH |
444 | next->set_comdat_group (NULL); |
445 | } | |
7f7beb3f | 446 | } |
1ff9ed6f JH |
447 | |
448 | /* During incremental linking we need to keep symbol weak for future | |
449 | linking. We can still drop definition if we know non-LTO world prevails. */ | |
450 | if (!flag_incremental_link) | |
451 | { | |
452 | DECL_WEAK (node->decl) = false; | |
453 | node->set_comdat_group (NULL); | |
454 | node->dissolve_same_comdat_group_list (); | |
455 | } | |
7f7beb3f | 456 | if (!define) |
1ff9ed6f JH |
457 | { |
458 | DECL_EXTERNAL (node->decl) = true; | |
459 | node->set_comdat_group (NULL); | |
460 | node->dissolve_same_comdat_group_list (); | |
461 | } | |
7f7beb3f JH |
462 | } |
463 | ||
ed2a53e7 JH |
464 | /* Try to get rid of weakref. */ |
465 | ||
466 | static void | |
467 | optimize_weakref (symtab_node *node) | |
468 | { | |
ed2a53e7 JH |
469 | bool strip_weakref = false; |
470 | bool static_alias = false; | |
471 | ||
472 | gcc_assert (node->weakref); | |
473 | ||
67914693 | 474 | /* Weakrefs with no target defined cannot be optimized. */ |
ed2a53e7 JH |
475 | if (!node->analyzed) |
476 | return; | |
477 | symtab_node *target = node->get_alias_target (); | |
478 | ||
479 | /* Weakrefs to weakrefs can be optimized only if target can be. */ | |
480 | if (target->weakref) | |
481 | optimize_weakref (target); | |
482 | if (target->weakref) | |
483 | return; | |
484 | ||
485 | /* If we have definition of weakref's target and we know it binds locally, | |
486 | we can turn weakref to static alias. */ | |
a8b522b4 ML |
487 | if (TARGET_SUPPORTS_ALIASES |
488 | && target->definition && decl_binds_to_current_def_p (target->decl)) | |
ed2a53e7 JH |
489 | strip_weakref = static_alias = true; |
490 | /* Otherwise we can turn weakref into transparent alias. This transformation | |
491 | may break asm statements which directly refers to symbol name and expect | |
492 | GNU as to translate it via .weakref directive. So do not optimize when | |
493 | DECL_PRESERVED is set and .weakref is supported. */ | |
494 | else if ((!DECL_PRESERVE_P (target->decl) | |
495 | || IDENTIFIER_TRANSPARENT_ALIAS (DECL_ASSEMBLER_NAME (node->decl))) | |
496 | && !DECL_WEAK (target->decl) | |
497 | && !DECL_EXTERNAL (target->decl) | |
498 | && ((target->definition && !target->can_be_discarded_p ()) | |
499 | || target->resolution != LDPR_UNDEF)) | |
500 | strip_weakref = true; | |
501 | if (!strip_weakref) | |
502 | return; | |
503 | node->weakref = false; | |
504 | IDENTIFIER_TRANSPARENT_ALIAS (DECL_ASSEMBLER_NAME (node->decl)) = 0; | |
505 | TREE_CHAIN (DECL_ASSEMBLER_NAME (node->decl)) = NULL_TREE; | |
506 | DECL_ATTRIBUTES (node->decl) = remove_attribute ("weakref", | |
507 | DECL_ATTRIBUTES | |
508 | (node->decl)); | |
509 | ||
510 | if (dump_file) | |
511 | fprintf (dump_file, "Optimizing weakref %s %s\n", | |
3629ff8a | 512 | node->dump_name (), |
ed2a53e7 JH |
513 | static_alias ? "as static alias" : "as transparent alias"); |
514 | ||
515 | if (static_alias) | |
516 | { | |
517 | /* make_decl_local will shortcircuit if it doesn't see TREE_PUBLIC. | |
518 | be sure it really clears the WEAK flag. */ | |
519 | TREE_PUBLIC (node->decl) = true; | |
520 | node->make_decl_local (); | |
521 | node->forced_by_abi = false; | |
522 | node->resolution = LDPR_PREVAILING_DEF_IRONLY; | |
523 | node->externally_visible = false; | |
524 | gcc_assert (!DECL_WEAK (node->decl)); | |
525 | node->transparent_alias = false; | |
526 | } | |
527 | else | |
528 | { | |
529 | symtab->change_decl_assembler_name | |
530 | (node->decl, DECL_ASSEMBLER_NAME (node->get_alias_target ()->decl)); | |
531 | node->transparent_alias = true; | |
532 | node->copy_visibility_from (target); | |
533 | } | |
534 | gcc_assert (node->alias); | |
535 | } | |
536 | ||
408de159 NS |
537 | /* NODE is an externally visible definition, which we've discovered is |
538 | not needed externally. Make it local to this compilation. */ | |
539 | ||
540 | static void | |
541 | localize_node (bool whole_program, symtab_node *node) | |
542 | { | |
543 | gcc_assert (whole_program || in_lto_p || !TREE_PUBLIC (node->decl)); | |
544 | ||
fb81a61b JH |
545 | /* It is possible that one comdat group contains both hidden and non-hidden |
546 | symbols. In this case we can privatize all hidden symbol but we need | |
547 | to keep non-hidden exported. */ | |
548 | if (node->same_comdat_group | |
5873f613 JH |
549 | && (node->resolution == LDPR_PREVAILING_DEF_IRONLY |
550 | || node->resolution == LDPR_PREVAILING_DEF_IRONLY_EXP)) | |
fb81a61b JH |
551 | { |
552 | symtab_node *next; | |
553 | for (next = node->same_comdat_group; | |
554 | next != node; next = next->same_comdat_group) | |
555 | if (next->resolution == LDPR_PREVAILING_DEF_IRONLY_EXP | |
556 | || next->resolution == LDPR_PREVAILING_DEF) | |
557 | break; | |
558 | if (node != next) | |
559 | { | |
560 | if (!node->transparent_alias) | |
561 | { | |
562 | node->resolution = LDPR_PREVAILING_DEF_IRONLY; | |
563 | node->make_decl_local (); | |
564 | if (!flag_incremental_link) | |
565 | node->unique_name |= true; | |
566 | return; | |
567 | } | |
568 | } | |
569 | } | |
570 | /* For similar reason do not privatize whole comdat when seeing comdat | |
571 | local. Wait for non-comdat symbol to be privatized first. */ | |
572 | if (node->comdat_local_p ()) | |
573 | return; | |
574 | ||
408de159 NS |
575 | if (node->same_comdat_group && TREE_PUBLIC (node->decl)) |
576 | { | |
577 | for (symtab_node *next = node->same_comdat_group; | |
578 | next != node; next = next->same_comdat_group) | |
579 | { | |
580 | next->set_comdat_group (NULL); | |
581 | if (!next->alias) | |
582 | next->set_section (NULL); | |
583 | if (!next->transparent_alias) | |
584 | next->make_decl_local (); | |
585 | next->unique_name | |
586 | |= ((next->resolution == LDPR_PREVAILING_DEF_IRONLY | |
587 | || next->resolution == LDPR_PREVAILING_DEF_IRONLY_EXP) | |
588 | && TREE_PUBLIC (next->decl) | |
589 | && !flag_incremental_link); | |
590 | } | |
591 | ||
592 | /* Now everything's localized, the grouping has no meaning, and | |
593 | will cause crashes if we keep it around. */ | |
594 | node->dissolve_same_comdat_group_list (); | |
595 | } | |
596 | ||
597 | node->unique_name | |
598 | |= ((node->resolution == LDPR_PREVAILING_DEF_IRONLY | |
599 | || node->resolution == LDPR_PREVAILING_DEF_IRONLY_EXP) | |
600 | && TREE_PUBLIC (node->decl) | |
601 | && !flag_incremental_link); | |
602 | ||
603 | if (TREE_PUBLIC (node->decl)) | |
604 | node->set_comdat_group (NULL); | |
605 | if (DECL_COMDAT (node->decl) && !node->alias) | |
606 | node->set_section (NULL); | |
607 | if (!node->transparent_alias) | |
608 | { | |
609 | node->resolution = LDPR_PREVAILING_DEF_IRONLY; | |
610 | node->make_decl_local (); | |
611 | } | |
612 | } | |
613 | ||
7f7beb3f JH |
614 | /* Decide on visibility of all symbols. */ |
615 | ||
616 | static unsigned int | |
617 | function_and_variable_visibility (bool whole_program) | |
618 | { | |
619 | struct cgraph_node *node; | |
620 | varpool_node *vnode; | |
621 | ||
4287b4e8 | 622 | /* All aliases should be processed at this point. */ |
7f7beb3f JH |
623 | gcc_checking_assert (!alias_pairs || !alias_pairs->length ()); |
624 | ||
4287b4e8 | 625 | #ifdef ASM_OUTPUT_DEF |
325fe816 YG |
626 | FOR_EACH_DEFINED_FUNCTION (node) |
627 | { | |
628 | if (node->get_availability () != AVAIL_INTERPOSABLE | |
629 | || DECL_EXTERNAL (node->decl) | |
99504686 ML |
630 | || node->has_aliases_p () |
631 | || lookup_attribute ("noipa", DECL_ATTRIBUTES (node->decl))) | |
325fe816 YG |
632 | continue; |
633 | ||
634 | cgraph_node *alias = 0; | |
27c5a177 MJ |
635 | cgraph_edge *next_edge; |
636 | for (cgraph_edge *e = node->callees; e; e = next_edge) | |
325fe816 | 637 | { |
27c5a177 | 638 | next_edge = e->next_callee; |
325fe816 YG |
639 | /* Recursive function calls usually can't be interposed. */ |
640 | ||
641 | if (!e->recursive_p ()) | |
642 | continue; | |
643 | ||
644 | if (!alias) | |
4287b4e8 | 645 | { |
325fe816 YG |
646 | alias = dyn_cast<cgraph_node *> (node->noninterposable_alias ()); |
647 | gcc_assert (alias && alias != node); | |
648 | } | |
649 | ||
650 | e->redirect_callee (alias); | |
651 | if (gimple_has_body_p (e->caller->decl)) | |
4287b4e8 | 652 | { |
325fe816 | 653 | push_cfun (DECL_STRUCT_FUNCTION (e->caller->decl)); |
27c5a177 | 654 | cgraph_edge::redirect_call_stmt_to_callee (e); |
4287b4e8 | 655 | pop_cfun (); |
325fe816 YG |
656 | } |
657 | } | |
658 | } | |
4287b4e8 ML |
659 | #endif |
660 | ||
7f7beb3f JH |
661 | FOR_EACH_FUNCTION (node) |
662 | { | |
663 | int flags = flags_from_decl_or_type (node->decl); | |
664 | ||
665 | /* Optimize away PURE and CONST constructors and destructors. */ | |
29f1e2b1 JH |
666 | if (node->analyzed |
667 | && (DECL_STATIC_CONSTRUCTOR (node->decl) | |
e1813e4b | 668 | || DECL_STATIC_DESTRUCTOR (node->decl)) |
7f7beb3f | 669 | && (flags & (ECF_CONST | ECF_PURE)) |
29f1e2b1 JH |
670 | && !(flags & ECF_LOOPING_CONST_OR_PURE) |
671 | && opt_for_fn (node->decl, optimize)) | |
7f7beb3f JH |
672 | { |
673 | DECL_STATIC_CONSTRUCTOR (node->decl) = 0; | |
674 | DECL_STATIC_DESTRUCTOR (node->decl) = 0; | |
675 | } | |
676 | ||
24d3f325 NS |
677 | /* Frontends and alias code marks nodes as needed before parsing |
678 | is finished. We may end up marking as node external nodes | |
679 | where this flag is meaningless strip it. */ | |
7f7beb3f JH |
680 | if (DECL_EXTERNAL (node->decl) || !node->definition) |
681 | { | |
682 | node->force_output = 0; | |
683 | node->forced_by_abi = 0; | |
684 | } | |
685 | ||
686 | /* C++ FE on lack of COMDAT support create local COMDAT functions | |
67914693 | 687 | (that ought to be shared but cannot due to object format |
7f7beb3f JH |
688 | limitations). It is necessary to keep the flag to make rest of C++ FE |
689 | happy. Clear the flag here to avoid confusion in middle-end. */ | |
690 | if (DECL_COMDAT (node->decl) && !TREE_PUBLIC (node->decl)) | |
691 | DECL_COMDAT (node->decl) = 0; | |
692 | ||
693 | /* For external decls stop tracking same_comdat_group. It doesn't matter | |
71713fa6 JH |
694 | what comdat group they are in when they won't be emitted in this TU. |
695 | ||
696 | An exception is LTO where we may end up with both external | |
697 | and non-external declarations in the same comdat group in | |
698 | the case declarations was not merged. */ | |
699 | if (node->same_comdat_group && DECL_EXTERNAL (node->decl) && !in_lto_p) | |
7f7beb3f | 700 | { |
b2b29377 MM |
701 | if (flag_checking) |
702 | { | |
703 | for (symtab_node *n = node->same_comdat_group; | |
704 | n != node; | |
705 | n = n->same_comdat_group) | |
706 | /* If at least one of same comdat group functions is external, | |
707 | all of them have to be, otherwise it is a front-end bug. */ | |
708 | gcc_assert (DECL_EXTERNAL (n->decl)); | |
709 | } | |
d52f5295 | 710 | node->dissolve_same_comdat_group_list (); |
7f7beb3f JH |
711 | } |
712 | gcc_assert ((!DECL_WEAK (node->decl) | |
da66d596 | 713 | && !DECL_COMDAT (node->decl)) |
7f7beb3f JH |
714 | || TREE_PUBLIC (node->decl) |
715 | || node->weakref | |
716 | || DECL_EXTERNAL (node->decl)); | |
717 | if (cgraph_externally_visible_p (node, whole_program)) | |
718 | { | |
a62bfab5 | 719 | gcc_assert (!node->inlined_to); |
7f7beb3f JH |
720 | node->externally_visible = true; |
721 | } | |
722 | else | |
723 | { | |
724 | node->externally_visible = false; | |
725 | node->forced_by_abi = false; | |
726 | } | |
727 | if (!node->externally_visible | |
728 | && node->definition && !node->weakref | |
729 | && !DECL_EXTERNAL (node->decl)) | |
408de159 | 730 | localize_node (whole_program, node); |
7f7beb3f | 731 | |
67f3791f | 732 | if (node->thunk |
7f7beb3f JH |
733 | && TREE_PUBLIC (node->decl)) |
734 | { | |
735 | struct cgraph_node *decl_node = node; | |
736 | ||
d52f5295 | 737 | decl_node = decl_node->callees->callee->function_symbol (); |
7f7beb3f JH |
738 | |
739 | /* Thunks have the same visibility as function they are attached to. | |
740 | Make sure the C++ front end set this up properly. */ | |
741 | if (DECL_ONE_ONLY (decl_node->decl)) | |
742 | { | |
743 | gcc_checking_assert (DECL_COMDAT (node->decl) | |
744 | == DECL_COMDAT (decl_node->decl)); | |
d52f5295 | 745 | gcc_checking_assert (node->in_same_comdat_group_p (decl_node)); |
7f7beb3f JH |
746 | gcc_checking_assert (node->same_comdat_group); |
747 | } | |
748 | node->forced_by_abi = decl_node->forced_by_abi; | |
749 | if (DECL_EXTERNAL (decl_node->decl)) | |
750 | DECL_EXTERNAL (node->decl) = 1; | |
751 | } | |
752 | ||
753 | update_visibility_by_resolution_info (node); | |
ed2a53e7 JH |
754 | if (node->weakref) |
755 | optimize_weakref (node); | |
7f7beb3f JH |
756 | } |
757 | FOR_EACH_DEFINED_FUNCTION (node) | |
758 | { | |
87f94429 ML |
759 | if (!node->local) |
760 | node->local |= node->local_p (); | |
7f7beb3f | 761 | |
67914693 SL |
762 | /* If we know that function cannot be overwritten by a |
763 | different semantics and moreover its section cannot be | |
f95ff97f NS |
764 | discarded, replace all direct calls by calls to an |
765 | noninterposable alias. This make dynamic linking cheaper and | |
766 | enable more optimization. | |
7f7beb3f JH |
767 | |
768 | TODO: We can also update virtual tables. */ | |
b4897212 | 769 | if (node->callers |
b4897212 | 770 | && can_replace_by_local_alias (node)) |
7f7beb3f | 771 | { |
d52f5295 ML |
772 | cgraph_node *alias = dyn_cast<cgraph_node *> |
773 | (node->noninterposable_alias ()); | |
7f7beb3f JH |
774 | |
775 | if (alias && alias != node) | |
776 | { | |
777 | while (node->callers) | |
778 | { | |
779 | struct cgraph_edge *e = node->callers; | |
780 | ||
3dafb85c | 781 | e->redirect_callee (alias); |
7f7beb3f JH |
782 | if (gimple_has_body_p (e->caller->decl)) |
783 | { | |
784 | push_cfun (DECL_STRUCT_FUNCTION (e->caller->decl)); | |
27c5a177 | 785 | cgraph_edge::redirect_call_stmt_to_callee (e); |
7f7beb3f JH |
786 | pop_cfun (); |
787 | } | |
788 | } | |
789 | } | |
790 | } | |
791 | } | |
792 | FOR_EACH_VARIABLE (vnode) | |
793 | { | |
794 | /* weak flag makes no sense on local variables. */ | |
795 | gcc_assert (!DECL_WEAK (vnode->decl) | |
796 | || vnode->weakref | |
797 | || TREE_PUBLIC (vnode->decl) | |
798 | || DECL_EXTERNAL (vnode->decl)); | |
67914693 | 799 | /* In several cases declarations cannot be common: |
7f7beb3f JH |
800 | |
801 | - when declaration has initializer | |
802 | - when it is in weak | |
803 | - when it has specific section | |
804 | - when it resides in non-generic address space. | |
805 | - if declaration is local, it will get into .local common section | |
806 | so common flag is not needed. Frontends still produce these in | |
807 | certain cases, such as for: | |
808 | ||
809 | static int a __attribute__ ((common)) | |
810 | ||
811 | Canonicalize things here and clear the redundant flag. */ | |
812 | if (DECL_COMMON (vnode->decl) | |
813 | && (!(TREE_PUBLIC (vnode->decl) | |
814 | || DECL_EXTERNAL (vnode->decl)) | |
815 | || (DECL_INITIAL (vnode->decl) | |
816 | && DECL_INITIAL (vnode->decl) != error_mark_node) | |
817 | || DECL_WEAK (vnode->decl) | |
818 | || DECL_SECTION_NAME (vnode->decl) != NULL | |
819 | || ! (ADDR_SPACE_GENERIC_P | |
820 | (TYPE_ADDR_SPACE (TREE_TYPE (vnode->decl)))))) | |
821 | DECL_COMMON (vnode->decl) = 0; | |
ed2a53e7 JH |
822 | if (vnode->weakref) |
823 | optimize_weakref (vnode); | |
7f7beb3f JH |
824 | } |
825 | FOR_EACH_DEFINED_VARIABLE (vnode) | |
826 | { | |
827 | if (!vnode->definition) | |
828 | continue; | |
9041d2e6 | 829 | if (vnode->externally_visible_p ()) |
7f7beb3f JH |
830 | vnode->externally_visible = true; |
831 | else | |
832 | { | |
833 | vnode->externally_visible = false; | |
834 | vnode->forced_by_abi = false; | |
835 | } | |
7861b648 AK |
836 | if (lookup_attribute ("no_reorder", |
837 | DECL_ATTRIBUTES (vnode->decl))) | |
838 | vnode->no_reorder = 1; | |
408de159 | 839 | |
7f7beb3f | 840 | if (!vnode->externally_visible |
fb81a61b JH |
841 | && !vnode->transparent_alias |
842 | && !DECL_EXTERNAL (vnode->decl)) | |
408de159 | 843 | localize_node (whole_program, vnode); |
7f7beb3f | 844 | |
7f7beb3f | 845 | update_visibility_by_resolution_info (vnode); |
07990a5e | 846 | |
862b3da6 | 847 | /* Update virtual tables to point to local aliases where possible. */ |
07990a5e | 848 | if (DECL_VIRTUAL_P (vnode->decl) |
ef68f4ab | 849 | && !DECL_EXTERNAL (vnode->decl)) |
07990a5e JH |
850 | { |
851 | int i; | |
852 | struct ipa_ref *ref; | |
853 | bool found = false; | |
854 | ||
855 | /* See if there is something to update. */ | |
ff70d83c | 856 | for (i = 0; vnode->iterate_reference (i, ref); i++) |
07990a5e JH |
857 | if (ref->use == IPA_REF_ADDR |
858 | && can_replace_by_local_alias_in_vtable (ref->referred)) | |
859 | { | |
860 | found = true; | |
861 | break; | |
862 | } | |
863 | if (found) | |
864 | { | |
6e2830c3 | 865 | hash_set<tree> visited_nodes; |
0b83e688 | 866 | |
9041d2e6 | 867 | vnode->get_constructor (); |
07990a5e | 868 | walk_tree (&DECL_INITIAL (vnode->decl), |
6e2830c3 | 869 | update_vtable_references, NULL, &visited_nodes); |
d122681a | 870 | vnode->remove_all_references (); |
07990a5e JH |
871 | record_references_in_initializer (vnode->decl, false); |
872 | } | |
873 | } | |
7f7beb3f JH |
874 | } |
875 | ||
1d561e18 AK |
876 | if (symtab->state >= IPA_SSA) |
877 | { | |
878 | FOR_EACH_VARIABLE (vnode) | |
879 | { | |
880 | tree decl = vnode->decl; | |
881 | ||
882 | /* Upgrade TLS access model based on optimized visibility status, | |
883 | unless it was specified explicitly or no references remain. */ | |
884 | if (DECL_THREAD_LOCAL_P (decl) | |
885 | && !lookup_attribute ("tls_model", DECL_ATTRIBUTES (decl)) | |
886 | && vnode->ref_list.referring.length ()) | |
887 | { | |
888 | enum tls_model new_model = decl_default_tls_model (decl); | |
82e629c2 AM |
889 | STATIC_ASSERT (TLS_MODEL_GLOBAL_DYNAMIC < TLS_MODEL_LOCAL_DYNAMIC); |
890 | STATIC_ASSERT (TLS_MODEL_INITIAL_EXEC < TLS_MODEL_LOCAL_EXEC); | |
891 | /* We'd prefer to assert that recomputed model is not weaker than | |
892 | what the front-end assigned, but cannot: see PR 107353. */ | |
893 | if (new_model >= decl_tls_model (decl)) | |
894 | set_decl_tls_model (decl, new_model); | |
1d561e18 AK |
895 | } |
896 | } | |
897 | } | |
898 | ||
7f7beb3f JH |
899 | if (dump_file) |
900 | { | |
901 | fprintf (dump_file, "\nMarking local functions:"); | |
902 | FOR_EACH_DEFINED_FUNCTION (node) | |
87f94429 | 903 | if (node->local) |
3629ff8a | 904 | fprintf (dump_file, " %s", node->dump_name ()); |
7f7beb3f JH |
905 | fprintf (dump_file, "\n\n"); |
906 | fprintf (dump_file, "\nMarking externally visible functions:"); | |
907 | FOR_EACH_DEFINED_FUNCTION (node) | |
908 | if (node->externally_visible) | |
3629ff8a | 909 | fprintf (dump_file, " %s", node->dump_name ()); |
7f7beb3f JH |
910 | fprintf (dump_file, "\n\n"); |
911 | fprintf (dump_file, "\nMarking externally visible variables:"); | |
912 | FOR_EACH_DEFINED_VARIABLE (vnode) | |
913 | if (vnode->externally_visible) | |
3629ff8a | 914 | fprintf (dump_file, " %s", vnode->dump_name ()); |
7f7beb3f JH |
915 | fprintf (dump_file, "\n\n"); |
916 | } | |
3dafb85c | 917 | symtab->function_flags_ready = true; |
7f7beb3f JH |
918 | return 0; |
919 | } | |
920 | ||
921 | /* Local function pass handling visibilities. This happens before LTO streaming | |
922 | so in particular -fwhole-program should be ignored at this level. */ | |
923 | ||
17795822 TS |
924 | namespace { |
925 | ||
926 | const pass_data pass_data_ipa_function_and_variable_visibility = | |
7f7beb3f JH |
927 | { |
928 | SIMPLE_IPA_PASS, /* type */ | |
929 | "visibility", /* name */ | |
930 | OPTGROUP_NONE, /* optinfo_flags */ | |
7f7beb3f JH |
931 | TV_CGRAPHOPT, /* tv_id */ |
932 | 0, /* properties_required */ | |
933 | 0, /* properties_provided */ | |
934 | 0, /* properties_destroyed */ | |
935 | 0, /* todo_flags_start */ | |
936 | ( TODO_remove_functions | TODO_dump_symtab ), /* todo_flags_finish */ | |
937 | }; | |
938 | ||
939 | /* Bring functions local at LTO time with -fwhole-program. */ | |
940 | ||
941 | static unsigned int | |
942 | whole_program_function_and_variable_visibility (void) | |
943 | { | |
944 | function_and_variable_visibility (flag_whole_program); | |
29f1e2b1 | 945 | if (optimize || in_lto_p) |
2e14744f | 946 | ipa_discover_variable_flags (); |
7f7beb3f JH |
947 | return 0; |
948 | } | |
949 | ||
17795822 TS |
950 | } // anon namespace |
951 | ||
952 | namespace { | |
953 | ||
954 | const pass_data pass_data_ipa_whole_program_visibility = | |
7f7beb3f JH |
955 | { |
956 | IPA_PASS, /* type */ | |
957 | "whole-program", /* name */ | |
958 | OPTGROUP_NONE, /* optinfo_flags */ | |
7f7beb3f JH |
959 | TV_CGRAPHOPT, /* tv_id */ |
960 | 0, /* properties_required */ | |
961 | 0, /* properties_provided */ | |
962 | 0, /* properties_destroyed */ | |
963 | 0, /* todo_flags_start */ | |
964 | ( TODO_remove_functions | TODO_dump_symtab ), /* todo_flags_finish */ | |
965 | }; | |
966 | ||
17795822 | 967 | class pass_ipa_whole_program_visibility : public ipa_opt_pass_d |
7f7beb3f JH |
968 | { |
969 | public: | |
970 | pass_ipa_whole_program_visibility (gcc::context *ctxt) | |
971 | : ipa_opt_pass_d (pass_data_ipa_whole_program_visibility, ctxt, | |
972 | NULL, /* generate_summary */ | |
973 | NULL, /* write_summary */ | |
974 | NULL, /* read_summary */ | |
975 | NULL, /* write_optimization_summary */ | |
976 | NULL, /* read_optimization_summary */ | |
977 | NULL, /* stmt_fixup */ | |
978 | 0, /* function_transform_todo_flags_start */ | |
979 | NULL, /* function_transform */ | |
980 | NULL) /* variable_transform */ | |
981 | {} | |
982 | ||
983 | /* opt_pass methods: */ | |
984 | ||
725793af | 985 | bool gate (function *) final override |
7f7beb3f JH |
986 | { |
987 | /* Do not re-run on ltrans stage. */ | |
988 | return !flag_ltrans; | |
989 | } | |
725793af | 990 | unsigned int execute (function *) final override |
7f7beb3f JH |
991 | { |
992 | return whole_program_function_and_variable_visibility (); | |
993 | } | |
994 | ||
995 | }; // class pass_ipa_whole_program_visibility | |
996 | ||
17795822 TS |
997 | } // anon namespace |
998 | ||
7f7beb3f JH |
999 | ipa_opt_pass_d * |
1000 | make_pass_ipa_whole_program_visibility (gcc::context *ctxt) | |
1001 | { | |
1002 | return new pass_ipa_whole_program_visibility (ctxt); | |
1003 | } | |
1004 | ||
1005 | class pass_ipa_function_and_variable_visibility : public simple_ipa_opt_pass | |
1006 | { | |
1007 | public: | |
1008 | pass_ipa_function_and_variable_visibility (gcc::context *ctxt) | |
1009 | : simple_ipa_opt_pass (pass_data_ipa_function_and_variable_visibility, | |
1010 | ctxt) | |
1011 | {} | |
1012 | ||
1013 | /* opt_pass methods: */ | |
725793af | 1014 | unsigned int execute (function *) final override |
7f7beb3f JH |
1015 | { |
1016 | return function_and_variable_visibility (flag_whole_program && !flag_lto); | |
1017 | } | |
1018 | ||
1019 | }; // class pass_ipa_function_and_variable_visibility | |
1020 | ||
1021 | simple_ipa_opt_pass * | |
1022 | make_pass_ipa_function_and_variable_visibility (gcc::context *ctxt) | |
1023 | { | |
1024 | return new pass_ipa_function_and_variable_visibility (ctxt); | |
1025 | } |