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7f7beb3f | 1 | /* IPA visibility pass |
a945c346 | 2 | Copyright (C) 2003-2024 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 | 104 | && !node->in_other_partition |
e98ad6a0 MJ |
105 | && node->get_availability () >= AVAIL_AVAILABLE |
106 | && !DECL_STATIC_CONSTRUCTOR (node->decl) | |
107 | && !DECL_STATIC_DESTRUCTOR (node->decl)); | |
7f7beb3f JH |
108 | } |
109 | ||
110 | /* Return true when function can be marked local. */ | |
111 | ||
112 | bool | |
d52f5295 | 113 | cgraph_node::local_p (void) |
7f7beb3f | 114 | { |
d52f5295 | 115 | cgraph_node *n = ultimate_alias_target (); |
7f7beb3f | 116 | |
67f3791f | 117 | if (n->thunk) |
953aad61 | 118 | return n->callees->callee->local_p (); |
4bd019b8 | 119 | return !n->call_for_symbol_thunks_and_aliases (non_local_p, |
953aad61 | 120 | NULL, true); |
7f7beb3f JH |
121 | } |
122 | ||
7f7beb3f JH |
123 | /* A helper for comdat_can_be_unshared_p. */ |
124 | ||
125 | static bool | |
126 | comdat_can_be_unshared_p_1 (symtab_node *node) | |
127 | { | |
128 | if (!node->externally_visible) | |
129 | return true; | |
0a7246ee JH |
130 | if (node->address_can_be_compared_p ()) |
131 | { | |
132 | struct ipa_ref *ref; | |
133 | ||
134 | for (unsigned int i = 0; node->iterate_referring (i, ref); i++) | |
135 | if (ref->address_matters_p ()) | |
136 | return false; | |
137 | } | |
7f7beb3f JH |
138 | |
139 | /* If the symbol is used in some weird way, better to not touch it. */ | |
140 | if (node->force_output) | |
141 | return false; | |
142 | ||
143 | /* Explicit instantiations needs to be output when possibly | |
144 | used externally. */ | |
145 | if (node->forced_by_abi | |
146 | && TREE_PUBLIC (node->decl) | |
147 | && (node->resolution != LDPR_PREVAILING_DEF_IRONLY | |
148 | && !flag_whole_program)) | |
149 | return false; | |
150 | ||
67914693 | 151 | /* Non-readonly and volatile variables cannot be duplicated. */ |
7f7beb3f JH |
152 | if (is_a <varpool_node *> (node) |
153 | && (!TREE_READONLY (node->decl) | |
154 | || TREE_THIS_VOLATILE (node->decl))) | |
155 | return false; | |
156 | return true; | |
157 | } | |
158 | ||
159 | /* COMDAT functions must be shared only if they have address taken, | |
160 | otherwise we can produce our own private implementation with | |
161 | -fwhole-program. | |
67914693 | 162 | Return true when turning COMDAT function static cannot lead to wrong |
7f7beb3f JH |
163 | code when the resulting object links with a library defining same COMDAT. |
164 | ||
165 | Virtual functions do have their addresses taken from the vtables, | |
166 | but in C++ there is no way to compare their addresses for equality. */ | |
167 | ||
168 | static bool | |
169 | comdat_can_be_unshared_p (symtab_node *node) | |
170 | { | |
171 | if (!comdat_can_be_unshared_p_1 (node)) | |
172 | return false; | |
173 | if (node->same_comdat_group) | |
174 | { | |
175 | symtab_node *next; | |
176 | ||
177 | /* If more than one function is in the same COMDAT group, it must | |
178 | be shared even if just one function in the comdat group has | |
179 | address taken. */ | |
180 | for (next = node->same_comdat_group; | |
181 | next != node; next = next->same_comdat_group) | |
182 | if (!comdat_can_be_unshared_p_1 (next)) | |
183 | return false; | |
184 | } | |
185 | return true; | |
186 | } | |
187 | ||
188 | /* Return true when function NODE should be considered externally visible. */ | |
189 | ||
190 | static bool | |
191 | cgraph_externally_visible_p (struct cgraph_node *node, | |
192 | bool whole_program) | |
193 | { | |
71e54687 JH |
194 | while (node->transparent_alias && node->definition) |
195 | node = node->get_alias_target (); | |
7f7beb3f JH |
196 | if (!node->definition) |
197 | return false; | |
198 | if (!TREE_PUBLIC (node->decl) | |
199 | || DECL_EXTERNAL (node->decl)) | |
200 | return false; | |
201 | ||
202 | /* Do not try to localize built-in functions yet. One of problems is that we | |
203 | end up mangling their asm for WHOPR that makes it impossible to call them | |
204 | using the implicit built-in declarations anymore. Similarly this enables | |
205 | us to remove them as unreachable before actual calls may appear during | |
206 | expansion or folding. */ | |
3d78e008 | 207 | if (fndecl_built_in_p (node->decl)) |
7f7beb3f JH |
208 | return true; |
209 | ||
210 | /* If linker counts on us, we must preserve the function. */ | |
d52f5295 | 211 | if (node->used_from_object_file_p ()) |
7f7beb3f JH |
212 | return true; |
213 | if (DECL_PRESERVE_P (node->decl)) | |
214 | return true; | |
215 | if (lookup_attribute ("externally_visible", | |
216 | DECL_ATTRIBUTES (node->decl))) | |
217 | return true; | |
036ea399 JJ |
218 | if (lookup_attribute ("noipa", DECL_ATTRIBUTES (node->decl))) |
219 | return true; | |
7f7beb3f JH |
220 | if (TARGET_DLLIMPORT_DECL_ATTRIBUTES |
221 | && lookup_attribute ("dllexport", | |
222 | DECL_ATTRIBUTES (node->decl))) | |
223 | return true; | |
40ebe1fc JH |
224 | |
225 | /* Limitation of gas requires us to output targets of symver aliases as | |
226 | global symbols. This is binutils PR 25295. */ | |
227 | ipa_ref *ref; | |
228 | FOR_EACH_ALIAS (node, ref) | |
229 | if (ref->referring->symver) | |
230 | return true; | |
231 | ||
7f7beb3f JH |
232 | if (node->resolution == LDPR_PREVAILING_DEF_IRONLY) |
233 | return false; | |
8def1d52 | 234 | /* When doing LTO or whole program, we can bring COMDAT functions static. |
7f7beb3f JH |
235 | This improves code quality and we know we will duplicate them at most twice |
236 | (in the case that we are not using plugin and link with object file | |
237 | implementing same COMDAT) */ | |
1ff9ed6f | 238 | if (((in_lto_p || whole_program) && !flag_incremental_link) |
7f7beb3f JH |
239 | && DECL_COMDAT (node->decl) |
240 | && comdat_can_be_unshared_p (node)) | |
241 | return false; | |
242 | ||
243 | /* When doing link time optimizations, hidden symbols become local. */ | |
1ff9ed6f | 244 | if ((in_lto_p && !flag_incremental_link) |
7f7beb3f JH |
245 | && (DECL_VISIBILITY (node->decl) == VISIBILITY_HIDDEN |
246 | || DECL_VISIBILITY (node->decl) == VISIBILITY_INTERNAL) | |
247 | /* Be sure that node is defined in IR file, not in other object | |
248 | file. In that case we don't set used_from_other_object_file. */ | |
249 | && node->definition) | |
250 | ; | |
251 | else if (!whole_program) | |
252 | return true; | |
253 | ||
254 | if (MAIN_NAME_P (DECL_NAME (node->decl))) | |
255 | return true; | |
256 | ||
257 | return false; | |
258 | } | |
259 | ||
9041d2e6 | 260 | /* Return true when variable should be considered externally visible. */ |
7f7beb3f JH |
261 | |
262 | bool | |
9041d2e6 | 263 | varpool_node::externally_visible_p (void) |
7f7beb3f | 264 | { |
71e54687 JH |
265 | while (transparent_alias && definition) |
266 | return get_alias_target ()->externally_visible_p (); | |
9041d2e6 | 267 | if (DECL_EXTERNAL (decl)) |
7f7beb3f JH |
268 | return true; |
269 | ||
9041d2e6 | 270 | if (!TREE_PUBLIC (decl)) |
7f7beb3f JH |
271 | return false; |
272 | ||
273 | /* If linker counts on us, we must preserve the function. */ | |
9041d2e6 | 274 | if (used_from_object_file_p ()) |
7f7beb3f JH |
275 | return true; |
276 | ||
8e1ba78f JH |
277 | /* Bringing TLS variables local may cause dynamic linker failures |
278 | on limits of static TLS vars. */ | |
279 | if (DECL_THREAD_LOCAL_P (decl) | |
280 | && (DECL_TLS_MODEL (decl) != TLS_MODEL_EMULATED | |
281 | && DECL_TLS_MODEL (decl) != TLS_MODEL_INITIAL_EXEC)) | |
282 | return true; | |
283 | ||
9041d2e6 | 284 | if (DECL_HARD_REGISTER (decl)) |
7f7beb3f | 285 | return true; |
9041d2e6 | 286 | if (DECL_PRESERVE_P (decl)) |
7f7beb3f JH |
287 | return true; |
288 | if (lookup_attribute ("externally_visible", | |
9041d2e6 | 289 | DECL_ATTRIBUTES (decl))) |
7f7beb3f JH |
290 | return true; |
291 | if (TARGET_DLLIMPORT_DECL_ATTRIBUTES | |
292 | && lookup_attribute ("dllexport", | |
9041d2e6 | 293 | DECL_ATTRIBUTES (decl))) |
7f7beb3f JH |
294 | return true; |
295 | ||
40ebe1fc JH |
296 | /* Limitation of gas requires us to output targets of symver aliases as |
297 | global symbols. This is binutils PR 25295. */ | |
298 | ipa_ref *ref; | |
299 | FOR_EACH_ALIAS (this, ref) | |
300 | if (ref->referring->symver) | |
301 | return true; | |
7f7beb3f | 302 | |
9041d2e6 | 303 | if (resolution == LDPR_PREVAILING_DEF_IRONLY) |
7f7beb3f JH |
304 | return false; |
305 | ||
306 | /* As a special case, the COMDAT virtual tables can be unshared. | |
307 | In LTO mode turn vtables into static variables. The variable is readonly, | |
308 | so this does not enable more optimization, but referring static var | |
309 | is faster for dynamic linking. Also this match logic hidding vtables | |
310 | from LTO symbol tables. */ | |
1ff9ed6f | 311 | if (((in_lto_p || flag_whole_program) && !flag_incremental_link) |
9041d2e6 ML |
312 | && DECL_COMDAT (decl) |
313 | && comdat_can_be_unshared_p (this)) | |
7f7beb3f JH |
314 | return false; |
315 | ||
316 | /* When doing link time optimizations, hidden symbols become local. */ | |
1ff9ed6f | 317 | if (in_lto_p && !flag_incremental_link |
9041d2e6 ML |
318 | && (DECL_VISIBILITY (decl) == VISIBILITY_HIDDEN |
319 | || DECL_VISIBILITY (decl) == VISIBILITY_INTERNAL) | |
7f7beb3f JH |
320 | /* Be sure that node is defined in IR file, not in other object |
321 | file. In that case we don't set used_from_other_object_file. */ | |
9041d2e6 | 322 | && definition) |
7f7beb3f JH |
323 | ; |
324 | else if (!flag_whole_program) | |
325 | return true; | |
326 | ||
327 | /* Do not attempt to privatize COMDATS by default. | |
328 | This would break linking with C++ libraries sharing | |
329 | inline definitions. | |
330 | ||
331 | FIXME: We can do so for readonly vars with no address taken and | |
332 | possibly also for vtables since no direct pointer comparsion is done. | |
333 | It might be interesting to do so to reduce linking overhead. */ | |
9041d2e6 | 334 | if (DECL_COMDAT (decl) || DECL_WEAK (decl)) |
7f7beb3f JH |
335 | return true; |
336 | return false; | |
337 | } | |
338 | ||
339 | /* Return true if reference to NODE can be replaced by a local alias. | |
340 | Local aliases save dynamic linking overhead and enable more optimizations. | |
341 | */ | |
342 | ||
f95ff97f | 343 | static bool |
7f7beb3f JH |
344 | can_replace_by_local_alias (symtab_node *node) |
345 | { | |
f95ff97f | 346 | /* If aliases aren't supported, we can't do replacement. */ |
a8b522b4 ML |
347 | if (!TARGET_SUPPORTS_ALIASES) |
348 | return false; | |
349 | ||
ced7e958 JH |
350 | /* Weakrefs have a reason to be non-local. Be sure we do not replace |
351 | them. */ | |
352 | while (node->transparent_alias && node->definition && !node->weakref) | |
353 | node = node->get_alias_target (); | |
354 | if (node->weakref) | |
355 | return false; | |
356 | ||
d52f5295 | 357 | return (node->get_availability () > AVAIL_INTERPOSABLE |
94c2e46c | 358 | && !decl_binds_to_current_def_p (node->decl) |
d52f5295 | 359 | && !node->can_be_discarded_p ()); |
7f7beb3f JH |
360 | } |
361 | ||
f95ff97f | 362 | /* Return true if we can replace reference to NODE by local alias |
07990a5e JH |
363 | within a virtual table. Generally we can replace function pointers |
364 | and virtual table pointers. */ | |
365 | ||
f95ff97f | 366 | static bool |
07990a5e JH |
367 | can_replace_by_local_alias_in_vtable (symtab_node *node) |
368 | { | |
369 | if (is_a <varpool_node *> (node) | |
370 | && !DECL_VIRTUAL_P (node->decl)) | |
371 | return false; | |
372 | return can_replace_by_local_alias (node); | |
373 | } | |
374 | ||
375 | /* walk_tree callback that rewrites initializer references. */ | |
376 | ||
377 | static tree | |
0a7246ee JH |
378 | update_vtable_references (tree *tp, int *walk_subtrees, |
379 | void *data ATTRIBUTE_UNUSED) | |
07990a5e | 380 | { |
8813a647 | 381 | if (VAR_OR_FUNCTION_DECL_P (*tp)) |
07990a5e | 382 | { |
d52f5295 ML |
383 | if (can_replace_by_local_alias_in_vtable (symtab_node::get (*tp))) |
384 | *tp = symtab_node::get (*tp)->noninterposable_alias ()->decl; | |
07990a5e JH |
385 | *walk_subtrees = 0; |
386 | } | |
387 | else if (IS_TYPE_OR_DECL_P (*tp)) | |
388 | *walk_subtrees = 0; | |
389 | return NULL; | |
390 | } | |
391 | ||
7f7beb3f JH |
392 | /* In LTO we can remove COMDAT groups and weak symbols. |
393 | Either turn them into normal symbols or external symbol depending on | |
394 | resolution info. */ | |
395 | ||
396 | static void | |
397 | update_visibility_by_resolution_info (symtab_node * node) | |
398 | { | |
399 | bool define; | |
400 | ||
401 | if (!node->externally_visible | |
402 | || (!DECL_WEAK (node->decl) && !DECL_ONE_ONLY (node->decl)) | |
da66d596 | 403 | || node->resolution == LDPR_UNKNOWN) |
7f7beb3f JH |
404 | return; |
405 | ||
406 | define = (node->resolution == LDPR_PREVAILING_DEF_IRONLY | |
407 | || node->resolution == LDPR_PREVAILING_DEF | |
2e4c1e6c | 408 | || node->resolution == LDPR_UNDEF |
7f7beb3f JH |
409 | || node->resolution == LDPR_PREVAILING_DEF_IRONLY_EXP); |
410 | ||
411 | /* The linker decisions ought to agree in the whole group. */ | |
412 | if (node->same_comdat_group) | |
413 | for (symtab_node *next = node->same_comdat_group; | |
414 | next != node; next = next->same_comdat_group) | |
a9e083cc | 415 | { |
ced7e958 | 416 | if (!next->externally_visible || next->transparent_alias) |
a9e083cc TS |
417 | continue; |
418 | ||
419 | bool same_def | |
420 | = define == (next->resolution == LDPR_PREVAILING_DEF_IRONLY | |
421 | || next->resolution == LDPR_PREVAILING_DEF | |
422 | || next->resolution == LDPR_UNDEF | |
423 | || next->resolution == LDPR_PREVAILING_DEF_IRONLY_EXP); | |
424 | gcc_assert (in_lto_p || same_def); | |
425 | if (!same_def) | |
426 | return; | |
427 | } | |
7f7beb3f JH |
428 | |
429 | if (node->same_comdat_group) | |
430 | for (symtab_node *next = node->same_comdat_group; | |
431 | next != node; next = next->same_comdat_group) | |
432 | { | |
1ff9ed6f JH |
433 | /* During incremental linking we need to keep symbol weak for future |
434 | linking. We can still drop definition if we know non-LTO world | |
435 | prevails. */ | |
436 | if (!flag_incremental_link) | |
437 | { | |
438 | DECL_WEAK (next->decl) = false; | |
439 | next->set_comdat_group (NULL); | |
440 | } | |
f1703a2e | 441 | if (!define) |
1ff9ed6f | 442 | { |
f1703a2e JH |
443 | if (next->externally_visible) |
444 | DECL_EXTERNAL (next->decl) = true; | |
1ff9ed6f JH |
445 | next->set_comdat_group (NULL); |
446 | } | |
7f7beb3f | 447 | } |
1ff9ed6f JH |
448 | |
449 | /* During incremental linking we need to keep symbol weak for future | |
450 | linking. We can still drop definition if we know non-LTO world prevails. */ | |
451 | if (!flag_incremental_link) | |
452 | { | |
453 | DECL_WEAK (node->decl) = false; | |
454 | node->set_comdat_group (NULL); | |
455 | node->dissolve_same_comdat_group_list (); | |
456 | } | |
7f7beb3f | 457 | if (!define) |
1ff9ed6f JH |
458 | { |
459 | DECL_EXTERNAL (node->decl) = true; | |
460 | node->set_comdat_group (NULL); | |
461 | node->dissolve_same_comdat_group_list (); | |
462 | } | |
7f7beb3f JH |
463 | } |
464 | ||
ed2a53e7 JH |
465 | /* Try to get rid of weakref. */ |
466 | ||
467 | static void | |
468 | optimize_weakref (symtab_node *node) | |
469 | { | |
ed2a53e7 JH |
470 | bool strip_weakref = false; |
471 | bool static_alias = false; | |
472 | ||
473 | gcc_assert (node->weakref); | |
474 | ||
67914693 | 475 | /* Weakrefs with no target defined cannot be optimized. */ |
ed2a53e7 JH |
476 | if (!node->analyzed) |
477 | return; | |
478 | symtab_node *target = node->get_alias_target (); | |
479 | ||
480 | /* Weakrefs to weakrefs can be optimized only if target can be. */ | |
481 | if (target->weakref) | |
482 | optimize_weakref (target); | |
483 | if (target->weakref) | |
484 | return; | |
485 | ||
486 | /* If we have definition of weakref's target and we know it binds locally, | |
487 | we can turn weakref to static alias. */ | |
a8b522b4 ML |
488 | if (TARGET_SUPPORTS_ALIASES |
489 | && target->definition && decl_binds_to_current_def_p (target->decl)) | |
ed2a53e7 JH |
490 | strip_weakref = static_alias = true; |
491 | /* Otherwise we can turn weakref into transparent alias. This transformation | |
492 | may break asm statements which directly refers to symbol name and expect | |
493 | GNU as to translate it via .weakref directive. So do not optimize when | |
494 | DECL_PRESERVED is set and .weakref is supported. */ | |
495 | else if ((!DECL_PRESERVE_P (target->decl) | |
496 | || IDENTIFIER_TRANSPARENT_ALIAS (DECL_ASSEMBLER_NAME (node->decl))) | |
497 | && !DECL_WEAK (target->decl) | |
498 | && !DECL_EXTERNAL (target->decl) | |
499 | && ((target->definition && !target->can_be_discarded_p ()) | |
500 | || target->resolution != LDPR_UNDEF)) | |
501 | strip_weakref = true; | |
502 | if (!strip_weakref) | |
503 | return; | |
504 | node->weakref = false; | |
505 | IDENTIFIER_TRANSPARENT_ALIAS (DECL_ASSEMBLER_NAME (node->decl)) = 0; | |
506 | TREE_CHAIN (DECL_ASSEMBLER_NAME (node->decl)) = NULL_TREE; | |
507 | DECL_ATTRIBUTES (node->decl) = remove_attribute ("weakref", | |
508 | DECL_ATTRIBUTES | |
509 | (node->decl)); | |
510 | ||
511 | if (dump_file) | |
512 | fprintf (dump_file, "Optimizing weakref %s %s\n", | |
3629ff8a | 513 | node->dump_name (), |
ed2a53e7 JH |
514 | static_alias ? "as static alias" : "as transparent alias"); |
515 | ||
516 | if (static_alias) | |
517 | { | |
518 | /* make_decl_local will shortcircuit if it doesn't see TREE_PUBLIC. | |
519 | be sure it really clears the WEAK flag. */ | |
520 | TREE_PUBLIC (node->decl) = true; | |
521 | node->make_decl_local (); | |
522 | node->forced_by_abi = false; | |
523 | node->resolution = LDPR_PREVAILING_DEF_IRONLY; | |
524 | node->externally_visible = false; | |
525 | gcc_assert (!DECL_WEAK (node->decl)); | |
526 | node->transparent_alias = false; | |
527 | } | |
528 | else | |
529 | { | |
530 | symtab->change_decl_assembler_name | |
531 | (node->decl, DECL_ASSEMBLER_NAME (node->get_alias_target ()->decl)); | |
532 | node->transparent_alias = true; | |
533 | node->copy_visibility_from (target); | |
534 | } | |
535 | gcc_assert (node->alias); | |
536 | } | |
537 | ||
408de159 NS |
538 | /* NODE is an externally visible definition, which we've discovered is |
539 | not needed externally. Make it local to this compilation. */ | |
540 | ||
541 | static void | |
542 | localize_node (bool whole_program, symtab_node *node) | |
543 | { | |
544 | gcc_assert (whole_program || in_lto_p || !TREE_PUBLIC (node->decl)); | |
545 | ||
fb81a61b JH |
546 | /* It is possible that one comdat group contains both hidden and non-hidden |
547 | symbols. In this case we can privatize all hidden symbol but we need | |
548 | to keep non-hidden exported. */ | |
549 | if (node->same_comdat_group | |
5873f613 JH |
550 | && (node->resolution == LDPR_PREVAILING_DEF_IRONLY |
551 | || node->resolution == LDPR_PREVAILING_DEF_IRONLY_EXP)) | |
fb81a61b JH |
552 | { |
553 | symtab_node *next; | |
554 | for (next = node->same_comdat_group; | |
555 | next != node; next = next->same_comdat_group) | |
556 | if (next->resolution == LDPR_PREVAILING_DEF_IRONLY_EXP | |
557 | || next->resolution == LDPR_PREVAILING_DEF) | |
558 | break; | |
559 | if (node != next) | |
560 | { | |
561 | if (!node->transparent_alias) | |
562 | { | |
563 | node->resolution = LDPR_PREVAILING_DEF_IRONLY; | |
564 | node->make_decl_local (); | |
565 | if (!flag_incremental_link) | |
566 | node->unique_name |= true; | |
567 | return; | |
568 | } | |
569 | } | |
570 | } | |
571 | /* For similar reason do not privatize whole comdat when seeing comdat | |
572 | local. Wait for non-comdat symbol to be privatized first. */ | |
573 | if (node->comdat_local_p ()) | |
574 | return; | |
575 | ||
408de159 NS |
576 | if (node->same_comdat_group && TREE_PUBLIC (node->decl)) |
577 | { | |
578 | for (symtab_node *next = node->same_comdat_group; | |
579 | next != node; next = next->same_comdat_group) | |
580 | { | |
581 | next->set_comdat_group (NULL); | |
582 | if (!next->alias) | |
583 | next->set_section (NULL); | |
584 | if (!next->transparent_alias) | |
585 | next->make_decl_local (); | |
586 | next->unique_name | |
587 | |= ((next->resolution == LDPR_PREVAILING_DEF_IRONLY | |
588 | || next->resolution == LDPR_PREVAILING_DEF_IRONLY_EXP) | |
589 | && TREE_PUBLIC (next->decl) | |
590 | && !flag_incremental_link); | |
591 | } | |
592 | ||
593 | /* Now everything's localized, the grouping has no meaning, and | |
594 | will cause crashes if we keep it around. */ | |
595 | node->dissolve_same_comdat_group_list (); | |
596 | } | |
597 | ||
598 | node->unique_name | |
599 | |= ((node->resolution == LDPR_PREVAILING_DEF_IRONLY | |
600 | || node->resolution == LDPR_PREVAILING_DEF_IRONLY_EXP) | |
601 | && TREE_PUBLIC (node->decl) | |
602 | && !flag_incremental_link); | |
603 | ||
604 | if (TREE_PUBLIC (node->decl)) | |
605 | node->set_comdat_group (NULL); | |
606 | if (DECL_COMDAT (node->decl) && !node->alias) | |
607 | node->set_section (NULL); | |
608 | if (!node->transparent_alias) | |
609 | { | |
610 | node->resolution = LDPR_PREVAILING_DEF_IRONLY; | |
611 | node->make_decl_local (); | |
612 | } | |
613 | } | |
614 | ||
7f7beb3f JH |
615 | /* Decide on visibility of all symbols. */ |
616 | ||
617 | static unsigned int | |
618 | function_and_variable_visibility (bool whole_program) | |
619 | { | |
620 | struct cgraph_node *node; | |
621 | varpool_node *vnode; | |
622 | ||
4287b4e8 | 623 | /* All aliases should be processed at this point. */ |
7f7beb3f JH |
624 | gcc_checking_assert (!alias_pairs || !alias_pairs->length ()); |
625 | ||
3dfe7e2d | 626 | if (TARGET_SUPPORTS_ALIASES) |
325fe816 | 627 | { |
3dfe7e2d | 628 | FOR_EACH_DEFINED_FUNCTION (node) |
325fe816 | 629 | { |
3dfe7e2d TS |
630 | if (node->get_availability () != AVAIL_INTERPOSABLE |
631 | || DECL_EXTERNAL (node->decl) | |
632 | || node->has_aliases_p () | |
633 | || lookup_attribute ("noipa", DECL_ATTRIBUTES (node->decl))) | |
325fe816 YG |
634 | continue; |
635 | ||
3dfe7e2d TS |
636 | cgraph_node *alias = 0; |
637 | cgraph_edge *next_edge; | |
638 | for (cgraph_edge *e = node->callees; e; e = next_edge) | |
4287b4e8 | 639 | { |
3dfe7e2d TS |
640 | next_edge = e->next_callee; |
641 | /* Recursive function calls usually can't be interposed. */ | |
642 | ||
643 | if (!e->recursive_p ()) | |
644 | continue; | |
645 | ||
646 | if (!alias) | |
647 | { | |
648 | alias | |
649 | = dyn_cast<cgraph_node *> (node->noninterposable_alias ()); | |
650 | gcc_assert (alias && alias != node); | |
651 | } | |
652 | ||
653 | e->redirect_callee (alias); | |
654 | if (gimple_has_body_p (e->caller->decl)) | |
655 | { | |
656 | push_cfun (DECL_STRUCT_FUNCTION (e->caller->decl)); | |
657 | cgraph_edge::redirect_call_stmt_to_callee (e); | |
658 | pop_cfun (); | |
659 | } | |
325fe816 YG |
660 | } |
661 | } | |
662 | } | |
4287b4e8 | 663 | |
7f7beb3f JH |
664 | FOR_EACH_FUNCTION (node) |
665 | { | |
666 | int flags = flags_from_decl_or_type (node->decl); | |
667 | ||
668 | /* Optimize away PURE and CONST constructors and destructors. */ | |
29f1e2b1 JH |
669 | if (node->analyzed |
670 | && (DECL_STATIC_CONSTRUCTOR (node->decl) | |
e1813e4b | 671 | || DECL_STATIC_DESTRUCTOR (node->decl)) |
7f7beb3f | 672 | && (flags & (ECF_CONST | ECF_PURE)) |
29f1e2b1 JH |
673 | && !(flags & ECF_LOOPING_CONST_OR_PURE) |
674 | && opt_for_fn (node->decl, optimize)) | |
7f7beb3f JH |
675 | { |
676 | DECL_STATIC_CONSTRUCTOR (node->decl) = 0; | |
677 | DECL_STATIC_DESTRUCTOR (node->decl) = 0; | |
678 | } | |
679 | ||
24d3f325 NS |
680 | /* Frontends and alias code marks nodes as needed before parsing |
681 | is finished. We may end up marking as node external nodes | |
682 | where this flag is meaningless strip it. */ | |
7f7beb3f JH |
683 | if (DECL_EXTERNAL (node->decl) || !node->definition) |
684 | { | |
685 | node->force_output = 0; | |
686 | node->forced_by_abi = 0; | |
687 | } | |
688 | ||
689 | /* C++ FE on lack of COMDAT support create local COMDAT functions | |
67914693 | 690 | (that ought to be shared but cannot due to object format |
7f7beb3f JH |
691 | limitations). It is necessary to keep the flag to make rest of C++ FE |
692 | happy. Clear the flag here to avoid confusion in middle-end. */ | |
693 | if (DECL_COMDAT (node->decl) && !TREE_PUBLIC (node->decl)) | |
694 | DECL_COMDAT (node->decl) = 0; | |
695 | ||
696 | /* For external decls stop tracking same_comdat_group. It doesn't matter | |
71713fa6 JH |
697 | what comdat group they are in when they won't be emitted in this TU. |
698 | ||
699 | An exception is LTO where we may end up with both external | |
700 | and non-external declarations in the same comdat group in | |
701 | the case declarations was not merged. */ | |
702 | if (node->same_comdat_group && DECL_EXTERNAL (node->decl) && !in_lto_p) | |
7f7beb3f | 703 | { |
b2b29377 MM |
704 | if (flag_checking) |
705 | { | |
706 | for (symtab_node *n = node->same_comdat_group; | |
707 | n != node; | |
708 | n = n->same_comdat_group) | |
709 | /* If at least one of same comdat group functions is external, | |
710 | all of them have to be, otherwise it is a front-end bug. */ | |
711 | gcc_assert (DECL_EXTERNAL (n->decl)); | |
712 | } | |
d52f5295 | 713 | node->dissolve_same_comdat_group_list (); |
7f7beb3f JH |
714 | } |
715 | gcc_assert ((!DECL_WEAK (node->decl) | |
da66d596 | 716 | && !DECL_COMDAT (node->decl)) |
7f7beb3f JH |
717 | || TREE_PUBLIC (node->decl) |
718 | || node->weakref | |
719 | || DECL_EXTERNAL (node->decl)); | |
720 | if (cgraph_externally_visible_p (node, whole_program)) | |
721 | { | |
a62bfab5 | 722 | gcc_assert (!node->inlined_to); |
7f7beb3f JH |
723 | node->externally_visible = true; |
724 | } | |
725 | else | |
726 | { | |
727 | node->externally_visible = false; | |
728 | node->forced_by_abi = false; | |
729 | } | |
730 | if (!node->externally_visible | |
731 | && node->definition && !node->weakref | |
732 | && !DECL_EXTERNAL (node->decl)) | |
408de159 | 733 | localize_node (whole_program, node); |
7f7beb3f | 734 | |
67f3791f | 735 | if (node->thunk |
7f7beb3f JH |
736 | && TREE_PUBLIC (node->decl)) |
737 | { | |
738 | struct cgraph_node *decl_node = node; | |
739 | ||
d52f5295 | 740 | decl_node = decl_node->callees->callee->function_symbol (); |
7f7beb3f JH |
741 | |
742 | /* Thunks have the same visibility as function they are attached to. | |
743 | Make sure the C++ front end set this up properly. */ | |
744 | if (DECL_ONE_ONLY (decl_node->decl)) | |
745 | { | |
746 | gcc_checking_assert (DECL_COMDAT (node->decl) | |
747 | == DECL_COMDAT (decl_node->decl)); | |
d52f5295 | 748 | gcc_checking_assert (node->in_same_comdat_group_p (decl_node)); |
7f7beb3f JH |
749 | gcc_checking_assert (node->same_comdat_group); |
750 | } | |
751 | node->forced_by_abi = decl_node->forced_by_abi; | |
752 | if (DECL_EXTERNAL (decl_node->decl)) | |
753 | DECL_EXTERNAL (node->decl) = 1; | |
754 | } | |
755 | ||
756 | update_visibility_by_resolution_info (node); | |
ed2a53e7 JH |
757 | if (node->weakref) |
758 | optimize_weakref (node); | |
7f7beb3f JH |
759 | } |
760 | FOR_EACH_DEFINED_FUNCTION (node) | |
761 | { | |
87f94429 ML |
762 | if (!node->local) |
763 | node->local |= node->local_p (); | |
7f7beb3f | 764 | |
67914693 SL |
765 | /* If we know that function cannot be overwritten by a |
766 | different semantics and moreover its section cannot be | |
f95ff97f NS |
767 | discarded, replace all direct calls by calls to an |
768 | noninterposable alias. This make dynamic linking cheaper and | |
769 | enable more optimization. | |
7f7beb3f JH |
770 | |
771 | TODO: We can also update virtual tables. */ | |
b4897212 | 772 | if (node->callers |
b4897212 | 773 | && can_replace_by_local_alias (node)) |
7f7beb3f | 774 | { |
d52f5295 ML |
775 | cgraph_node *alias = dyn_cast<cgraph_node *> |
776 | (node->noninterposable_alias ()); | |
7f7beb3f JH |
777 | |
778 | if (alias && alias != node) | |
779 | { | |
780 | while (node->callers) | |
781 | { | |
782 | struct cgraph_edge *e = node->callers; | |
783 | ||
3dafb85c | 784 | e->redirect_callee (alias); |
7f7beb3f JH |
785 | if (gimple_has_body_p (e->caller->decl)) |
786 | { | |
787 | push_cfun (DECL_STRUCT_FUNCTION (e->caller->decl)); | |
27c5a177 | 788 | cgraph_edge::redirect_call_stmt_to_callee (e); |
7f7beb3f JH |
789 | pop_cfun (); |
790 | } | |
791 | } | |
792 | } | |
793 | } | |
794 | } | |
795 | FOR_EACH_VARIABLE (vnode) | |
796 | { | |
797 | /* weak flag makes no sense on local variables. */ | |
798 | gcc_assert (!DECL_WEAK (vnode->decl) | |
799 | || vnode->weakref | |
800 | || TREE_PUBLIC (vnode->decl) | |
801 | || DECL_EXTERNAL (vnode->decl)); | |
67914693 | 802 | /* In several cases declarations cannot be common: |
7f7beb3f JH |
803 | |
804 | - when declaration has initializer | |
805 | - when it is in weak | |
806 | - when it has specific section | |
807 | - when it resides in non-generic address space. | |
808 | - if declaration is local, it will get into .local common section | |
809 | so common flag is not needed. Frontends still produce these in | |
810 | certain cases, such as for: | |
811 | ||
812 | static int a __attribute__ ((common)) | |
813 | ||
814 | Canonicalize things here and clear the redundant flag. */ | |
815 | if (DECL_COMMON (vnode->decl) | |
816 | && (!(TREE_PUBLIC (vnode->decl) | |
817 | || DECL_EXTERNAL (vnode->decl)) | |
818 | || (DECL_INITIAL (vnode->decl) | |
819 | && DECL_INITIAL (vnode->decl) != error_mark_node) | |
820 | || DECL_WEAK (vnode->decl) | |
821 | || DECL_SECTION_NAME (vnode->decl) != NULL | |
822 | || ! (ADDR_SPACE_GENERIC_P | |
823 | (TYPE_ADDR_SPACE (TREE_TYPE (vnode->decl)))))) | |
824 | DECL_COMMON (vnode->decl) = 0; | |
ed2a53e7 JH |
825 | if (vnode->weakref) |
826 | optimize_weakref (vnode); | |
7f7beb3f JH |
827 | } |
828 | FOR_EACH_DEFINED_VARIABLE (vnode) | |
829 | { | |
830 | if (!vnode->definition) | |
831 | continue; | |
9041d2e6 | 832 | if (vnode->externally_visible_p ()) |
7f7beb3f JH |
833 | vnode->externally_visible = true; |
834 | else | |
835 | { | |
836 | vnode->externally_visible = false; | |
837 | vnode->forced_by_abi = false; | |
838 | } | |
7861b648 AK |
839 | if (lookup_attribute ("no_reorder", |
840 | DECL_ATTRIBUTES (vnode->decl))) | |
841 | vnode->no_reorder = 1; | |
408de159 | 842 | |
7f7beb3f | 843 | if (!vnode->externally_visible |
fb81a61b JH |
844 | && !vnode->transparent_alias |
845 | && !DECL_EXTERNAL (vnode->decl)) | |
408de159 | 846 | localize_node (whole_program, vnode); |
7f7beb3f | 847 | |
7f7beb3f | 848 | update_visibility_by_resolution_info (vnode); |
07990a5e | 849 | |
862b3da6 | 850 | /* Update virtual tables to point to local aliases where possible. */ |
07990a5e | 851 | if (DECL_VIRTUAL_P (vnode->decl) |
ef68f4ab | 852 | && !DECL_EXTERNAL (vnode->decl)) |
07990a5e JH |
853 | { |
854 | int i; | |
855 | struct ipa_ref *ref; | |
856 | bool found = false; | |
857 | ||
858 | /* See if there is something to update. */ | |
ff70d83c | 859 | for (i = 0; vnode->iterate_reference (i, ref); i++) |
07990a5e JH |
860 | if (ref->use == IPA_REF_ADDR |
861 | && can_replace_by_local_alias_in_vtable (ref->referred)) | |
862 | { | |
863 | found = true; | |
864 | break; | |
865 | } | |
866 | if (found) | |
867 | { | |
6e2830c3 | 868 | hash_set<tree> visited_nodes; |
0b83e688 | 869 | |
9041d2e6 | 870 | vnode->get_constructor (); |
07990a5e | 871 | walk_tree (&DECL_INITIAL (vnode->decl), |
6e2830c3 | 872 | update_vtable_references, NULL, &visited_nodes); |
d122681a | 873 | vnode->remove_all_references (); |
07990a5e JH |
874 | record_references_in_initializer (vnode->decl, false); |
875 | } | |
876 | } | |
7f7beb3f JH |
877 | } |
878 | ||
1d561e18 AK |
879 | if (symtab->state >= IPA_SSA) |
880 | { | |
881 | FOR_EACH_VARIABLE (vnode) | |
882 | { | |
883 | tree decl = vnode->decl; | |
884 | ||
885 | /* Upgrade TLS access model based on optimized visibility status, | |
886 | unless it was specified explicitly or no references remain. */ | |
887 | if (DECL_THREAD_LOCAL_P (decl) | |
888 | && !lookup_attribute ("tls_model", DECL_ATTRIBUTES (decl)) | |
889 | && vnode->ref_list.referring.length ()) | |
890 | { | |
891 | enum tls_model new_model = decl_default_tls_model (decl); | |
82e629c2 AM |
892 | STATIC_ASSERT (TLS_MODEL_GLOBAL_DYNAMIC < TLS_MODEL_LOCAL_DYNAMIC); |
893 | STATIC_ASSERT (TLS_MODEL_INITIAL_EXEC < TLS_MODEL_LOCAL_EXEC); | |
894 | /* We'd prefer to assert that recomputed model is not weaker than | |
895 | what the front-end assigned, but cannot: see PR 107353. */ | |
896 | if (new_model >= decl_tls_model (decl)) | |
897 | set_decl_tls_model (decl, new_model); | |
1d561e18 AK |
898 | } |
899 | } | |
900 | } | |
901 | ||
7f7beb3f JH |
902 | if (dump_file) |
903 | { | |
904 | fprintf (dump_file, "\nMarking local functions:"); | |
905 | FOR_EACH_DEFINED_FUNCTION (node) | |
87f94429 | 906 | if (node->local) |
3629ff8a | 907 | fprintf (dump_file, " %s", node->dump_name ()); |
7f7beb3f JH |
908 | fprintf (dump_file, "\n\n"); |
909 | fprintf (dump_file, "\nMarking externally visible functions:"); | |
910 | FOR_EACH_DEFINED_FUNCTION (node) | |
911 | if (node->externally_visible) | |
3629ff8a | 912 | fprintf (dump_file, " %s", node->dump_name ()); |
7f7beb3f JH |
913 | fprintf (dump_file, "\n\n"); |
914 | fprintf (dump_file, "\nMarking externally visible variables:"); | |
915 | FOR_EACH_DEFINED_VARIABLE (vnode) | |
916 | if (vnode->externally_visible) | |
3629ff8a | 917 | fprintf (dump_file, " %s", vnode->dump_name ()); |
7f7beb3f JH |
918 | fprintf (dump_file, "\n\n"); |
919 | } | |
3dafb85c | 920 | symtab->function_flags_ready = true; |
7f7beb3f JH |
921 | return 0; |
922 | } | |
923 | ||
924 | /* Local function pass handling visibilities. This happens before LTO streaming | |
925 | so in particular -fwhole-program should be ignored at this level. */ | |
926 | ||
17795822 TS |
927 | namespace { |
928 | ||
929 | const pass_data pass_data_ipa_function_and_variable_visibility = | |
7f7beb3f JH |
930 | { |
931 | SIMPLE_IPA_PASS, /* type */ | |
932 | "visibility", /* name */ | |
933 | OPTGROUP_NONE, /* optinfo_flags */ | |
7f7beb3f JH |
934 | TV_CGRAPHOPT, /* tv_id */ |
935 | 0, /* properties_required */ | |
936 | 0, /* properties_provided */ | |
937 | 0, /* properties_destroyed */ | |
938 | 0, /* todo_flags_start */ | |
939 | ( TODO_remove_functions | TODO_dump_symtab ), /* todo_flags_finish */ | |
940 | }; | |
941 | ||
942 | /* Bring functions local at LTO time with -fwhole-program. */ | |
943 | ||
944 | static unsigned int | |
945 | whole_program_function_and_variable_visibility (void) | |
946 | { | |
947 | function_and_variable_visibility (flag_whole_program); | |
29f1e2b1 | 948 | if (optimize || in_lto_p) |
2e14744f | 949 | ipa_discover_variable_flags (); |
7f7beb3f JH |
950 | return 0; |
951 | } | |
952 | ||
17795822 TS |
953 | } // anon namespace |
954 | ||
955 | namespace { | |
956 | ||
957 | const pass_data pass_data_ipa_whole_program_visibility = | |
7f7beb3f JH |
958 | { |
959 | IPA_PASS, /* type */ | |
960 | "whole-program", /* name */ | |
961 | OPTGROUP_NONE, /* optinfo_flags */ | |
7f7beb3f JH |
962 | TV_CGRAPHOPT, /* tv_id */ |
963 | 0, /* properties_required */ | |
964 | 0, /* properties_provided */ | |
965 | 0, /* properties_destroyed */ | |
966 | 0, /* todo_flags_start */ | |
967 | ( TODO_remove_functions | TODO_dump_symtab ), /* todo_flags_finish */ | |
968 | }; | |
969 | ||
17795822 | 970 | class pass_ipa_whole_program_visibility : public ipa_opt_pass_d |
7f7beb3f JH |
971 | { |
972 | public: | |
973 | pass_ipa_whole_program_visibility (gcc::context *ctxt) | |
974 | : ipa_opt_pass_d (pass_data_ipa_whole_program_visibility, ctxt, | |
975 | NULL, /* generate_summary */ | |
976 | NULL, /* write_summary */ | |
977 | NULL, /* read_summary */ | |
978 | NULL, /* write_optimization_summary */ | |
979 | NULL, /* read_optimization_summary */ | |
980 | NULL, /* stmt_fixup */ | |
981 | 0, /* function_transform_todo_flags_start */ | |
982 | NULL, /* function_transform */ | |
983 | NULL) /* variable_transform */ | |
984 | {} | |
985 | ||
986 | /* opt_pass methods: */ | |
987 | ||
725793af | 988 | bool gate (function *) final override |
7f7beb3f JH |
989 | { |
990 | /* Do not re-run on ltrans stage. */ | |
991 | return !flag_ltrans; | |
992 | } | |
725793af | 993 | unsigned int execute (function *) final override |
7f7beb3f JH |
994 | { |
995 | return whole_program_function_and_variable_visibility (); | |
996 | } | |
997 | ||
998 | }; // class pass_ipa_whole_program_visibility | |
999 | ||
17795822 TS |
1000 | } // anon namespace |
1001 | ||
7f7beb3f JH |
1002 | ipa_opt_pass_d * |
1003 | make_pass_ipa_whole_program_visibility (gcc::context *ctxt) | |
1004 | { | |
1005 | return new pass_ipa_whole_program_visibility (ctxt); | |
1006 | } | |
1007 | ||
1008 | class pass_ipa_function_and_variable_visibility : public simple_ipa_opt_pass | |
1009 | { | |
1010 | public: | |
1011 | pass_ipa_function_and_variable_visibility (gcc::context *ctxt) | |
1012 | : simple_ipa_opt_pass (pass_data_ipa_function_and_variable_visibility, | |
1013 | ctxt) | |
1014 | {} | |
1015 | ||
1016 | /* opt_pass methods: */ | |
725793af | 1017 | unsigned int execute (function *) final override |
7f7beb3f JH |
1018 | { |
1019 | return function_and_variable_visibility (flag_whole_program && !flag_lto); | |
1020 | } | |
1021 | ||
1022 | }; // class pass_ipa_function_and_variable_visibility | |
1023 | ||
1024 | simple_ipa_opt_pass * | |
1025 | make_pass_ipa_function_and_variable_visibility (gcc::context *ctxt) | |
1026 | { | |
1027 | return new pass_ipa_function_and_variable_visibility (ctxt); | |
1028 | } |