2 Copyright (C) 2003-2015 Free Software Foundation, Inc.
4 This file is part of GCC.
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
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
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/>. */
20 /* This file implements two related passes:
22 - pass_data_ipa_function_and_variable_visibility run just after
23 symbol table, references and callgraph are built
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.
29 Purpose of both passes is to set correctly visibility properties
30 of all symbols. This includes:
32 - Symbol privatization:
34 Some symbols that are declared public by frontend may be
35 turned local (either by -fwhole-program flag, by linker plugin feedback
38 - Discovery of local functions:
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.
45 externally_visible flag is set for symbols that can not be privatized.
46 For privatized symbols we clear TREE_PUBLIC flag and dismantle comdat
49 - Dismantling of comdat groups:
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.
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
68 TODO: This should be done for references, too.
70 - Removal of static ocnstructors and destructors that have no side effects.
72 - Regularization of several oddities introduced by frontends that may
73 be impractical later in the optimization queue. */
77 #include "coretypes.h"
82 #include "double-int.h"
91 #include "plugin-api.h"
92 #include "hard-reg-set.h"
97 #include "tree-pass.h"
99 #include "gimple-expr.h"
102 /* Return true when NODE can not be local. Worker for cgraph_local_node_p. */
105 non_local_p (struct cgraph_node *node, void *data ATTRIBUTE_UNUSED)
107 return !(node->only_called_directly_or_aliased_p ()
108 /* i386 would need update to output thunk with locak calling
110 && !node->thunk.thunk_p
112 && !DECL_EXTERNAL (node->decl)
113 && !node->externally_visible
114 && !node->used_from_other_partition
115 && !node->in_other_partition);
118 /* Return true when function can be marked local. */
121 cgraph_node::local_p (void)
123 cgraph_node *n = ultimate_alias_target ();
125 if (n->thunk.thunk_p)
126 return n->callees->callee->local_p ();
127 return !n->call_for_symbol_thunks_and_aliases (non_local_p,
132 /* Return true when there is a reference to node and it is not vtable. */
135 symtab_node::address_taken_from_non_vtable_p (void)
138 struct ipa_ref *ref = NULL;
140 for (i = 0; iterate_referring (i, ref); i++)
141 if (ref->use == IPA_REF_ADDR)
144 if (is_a <cgraph_node *> (ref->referring))
146 node = dyn_cast <varpool_node *> (ref->referring);
147 if (!DECL_VIRTUAL_P (node->decl))
153 /* A helper for comdat_can_be_unshared_p. */
156 comdat_can_be_unshared_p_1 (symtab_node *node)
158 if (!node->externally_visible)
160 /* When address is taken, we don't know if equality comparison won't
161 break eventually. Exception are virutal functions, C++
162 constructors/destructors and vtables, where this is not possible by
163 language standard. */
164 if (!DECL_VIRTUAL_P (node->decl)
165 && (TREE_CODE (node->decl) != FUNCTION_DECL
166 || (!DECL_CXX_CONSTRUCTOR_P (node->decl)
167 && !DECL_CXX_DESTRUCTOR_P (node->decl)))
168 && node->address_taken_from_non_vtable_p ())
171 /* If the symbol is used in some weird way, better to not touch it. */
172 if (node->force_output)
175 /* Explicit instantiations needs to be output when possibly
177 if (node->forced_by_abi
178 && TREE_PUBLIC (node->decl)
179 && (node->resolution != LDPR_PREVAILING_DEF_IRONLY
180 && !flag_whole_program))
183 /* Non-readonly and volatile variables can not be duplicated. */
184 if (is_a <varpool_node *> (node)
185 && (!TREE_READONLY (node->decl)
186 || TREE_THIS_VOLATILE (node->decl)))
191 /* COMDAT functions must be shared only if they have address taken,
192 otherwise we can produce our own private implementation with
194 Return true when turning COMDAT functoin static can not lead to wrong
195 code when the resulting object links with a library defining same COMDAT.
197 Virtual functions do have their addresses taken from the vtables,
198 but in C++ there is no way to compare their addresses for equality. */
201 comdat_can_be_unshared_p (symtab_node *node)
203 if (!comdat_can_be_unshared_p_1 (node))
205 if (node->same_comdat_group)
209 /* If more than one function is in the same COMDAT group, it must
210 be shared even if just one function in the comdat group has
212 for (next = node->same_comdat_group;
213 next != node; next = next->same_comdat_group)
214 if (!comdat_can_be_unshared_p_1 (next))
220 /* Return true when function NODE should be considered externally visible. */
223 cgraph_externally_visible_p (struct cgraph_node *node,
226 if (!node->definition)
228 if (!TREE_PUBLIC (node->decl)
229 || DECL_EXTERNAL (node->decl))
232 /* Do not try to localize built-in functions yet. One of problems is that we
233 end up mangling their asm for WHOPR that makes it impossible to call them
234 using the implicit built-in declarations anymore. Similarly this enables
235 us to remove them as unreachable before actual calls may appear during
236 expansion or folding. */
237 if (DECL_BUILT_IN (node->decl))
240 /* If linker counts on us, we must preserve the function. */
241 if (node->used_from_object_file_p ())
243 if (DECL_PRESERVE_P (node->decl))
245 if (lookup_attribute ("externally_visible",
246 DECL_ATTRIBUTES (node->decl)))
248 if (TARGET_DLLIMPORT_DECL_ATTRIBUTES
249 && lookup_attribute ("dllexport",
250 DECL_ATTRIBUTES (node->decl)))
252 if (node->resolution == LDPR_PREVAILING_DEF_IRONLY)
254 /* When doing LTO or whole program, we can bring COMDAT functoins static.
255 This improves code quality and we know we will duplicate them at most twice
256 (in the case that we are not using plugin and link with object file
257 implementing same COMDAT) */
258 if ((in_lto_p || whole_program)
259 && DECL_COMDAT (node->decl)
260 && comdat_can_be_unshared_p (node))
263 /* When doing link time optimizations, hidden symbols become local. */
265 && (DECL_VISIBILITY (node->decl) == VISIBILITY_HIDDEN
266 || DECL_VISIBILITY (node->decl) == VISIBILITY_INTERNAL)
267 /* Be sure that node is defined in IR file, not in other object
268 file. In that case we don't set used_from_other_object_file. */
271 else if (!whole_program)
274 if (MAIN_NAME_P (DECL_NAME (node->decl)))
277 if (node->instrumentation_clone
278 && MAIN_NAME_P (DECL_NAME (node->orig_decl)))
284 /* Return true when variable should be considered externally visible. */
287 varpool_node::externally_visible_p (void)
289 if (DECL_EXTERNAL (decl))
292 if (!TREE_PUBLIC (decl))
295 /* If linker counts on us, we must preserve the function. */
296 if (used_from_object_file_p ())
299 /* Bringing TLS variables local may cause dynamic linker failures
300 on limits of static TLS vars. */
301 if (DECL_THREAD_LOCAL_P (decl)
302 && (DECL_TLS_MODEL (decl) != TLS_MODEL_EMULATED
303 && DECL_TLS_MODEL (decl) != TLS_MODEL_INITIAL_EXEC))
306 if (DECL_HARD_REGISTER (decl))
308 if (DECL_PRESERVE_P (decl))
310 if (lookup_attribute ("externally_visible",
311 DECL_ATTRIBUTES (decl)))
313 if (TARGET_DLLIMPORT_DECL_ATTRIBUTES
314 && lookup_attribute ("dllexport",
315 DECL_ATTRIBUTES (decl)))
318 /* See if we have linker information about symbol not being used or
319 if we need to make guess based on the declaration.
321 Even if the linker clams the symbol is unused, never bring internal
322 symbols that are declared by user as used or externally visible.
323 This is needed for i.e. references from asm statements. */
324 if (used_from_object_file_p ())
326 if (resolution == LDPR_PREVAILING_DEF_IRONLY)
329 /* As a special case, the COMDAT virtual tables can be unshared.
330 In LTO mode turn vtables into static variables. The variable is readonly,
331 so this does not enable more optimization, but referring static var
332 is faster for dynamic linking. Also this match logic hidding vtables
333 from LTO symbol tables. */
334 if ((in_lto_p || flag_whole_program)
335 && DECL_COMDAT (decl)
336 && comdat_can_be_unshared_p (this))
339 /* When doing link time optimizations, hidden symbols become local. */
341 && (DECL_VISIBILITY (decl) == VISIBILITY_HIDDEN
342 || DECL_VISIBILITY (decl) == VISIBILITY_INTERNAL)
343 /* Be sure that node is defined in IR file, not in other object
344 file. In that case we don't set used_from_other_object_file. */
347 else if (!flag_whole_program)
350 /* Do not attempt to privatize COMDATS by default.
351 This would break linking with C++ libraries sharing
354 FIXME: We can do so for readonly vars with no address taken and
355 possibly also for vtables since no direct pointer comparsion is done.
356 It might be interesting to do so to reduce linking overhead. */
357 if (DECL_COMDAT (decl) || DECL_WEAK (decl))
362 /* Return true if reference to NODE can be replaced by a local alias.
363 Local aliases save dynamic linking overhead and enable more optimizations.
367 can_replace_by_local_alias (symtab_node *node)
369 return (node->get_availability () > AVAIL_INTERPOSABLE
370 && !decl_binds_to_current_def_p (node->decl)
371 && !node->can_be_discarded_p ());
374 /* Return true if we can replace refernece to NODE by local alias
375 within a virtual table. Generally we can replace function pointers
376 and virtual table pointers. */
379 can_replace_by_local_alias_in_vtable (symtab_node *node)
381 if (is_a <varpool_node *> (node)
382 && !DECL_VIRTUAL_P (node->decl))
384 return can_replace_by_local_alias (node);
387 /* walk_tree callback that rewrites initializer references. */
390 update_vtable_references (tree *tp, int *walk_subtrees, void *data ATTRIBUTE_UNUSED)
392 if (TREE_CODE (*tp) == VAR_DECL
393 || TREE_CODE (*tp) == FUNCTION_DECL)
395 if (can_replace_by_local_alias_in_vtable (symtab_node::get (*tp)))
396 *tp = symtab_node::get (*tp)->noninterposable_alias ()->decl;
399 else if (IS_TYPE_OR_DECL_P (*tp))
404 /* In LTO we can remove COMDAT groups and weak symbols.
405 Either turn them into normal symbols or external symbol depending on
409 update_visibility_by_resolution_info (symtab_node * node)
413 if (!node->externally_visible
414 || (!DECL_WEAK (node->decl) && !DECL_ONE_ONLY (node->decl))
415 || node->resolution == LDPR_UNKNOWN)
418 define = (node->resolution == LDPR_PREVAILING_DEF_IRONLY
419 || node->resolution == LDPR_PREVAILING_DEF
420 || node->resolution == LDPR_UNDEF
421 || node->resolution == LDPR_PREVAILING_DEF_IRONLY_EXP);
423 /* The linker decisions ought to agree in the whole group. */
424 if (node->same_comdat_group)
425 for (symtab_node *next = node->same_comdat_group;
426 next != node; next = next->same_comdat_group)
428 if (!next->externally_visible)
432 = define == (next->resolution == LDPR_PREVAILING_DEF_IRONLY
433 || next->resolution == LDPR_PREVAILING_DEF
434 || next->resolution == LDPR_UNDEF
435 || next->resolution == LDPR_PREVAILING_DEF_IRONLY_EXP);
436 gcc_assert (in_lto_p || same_def);
441 if (node->same_comdat_group)
442 for (symtab_node *next = node->same_comdat_group;
443 next != node; next = next->same_comdat_group)
445 next->set_comdat_group (NULL);
446 DECL_WEAK (next->decl) = false;
447 if (next->externally_visible
449 DECL_EXTERNAL (next->decl) = true;
451 node->set_comdat_group (NULL);
452 DECL_WEAK (node->decl) = false;
454 DECL_EXTERNAL (node->decl) = true;
455 node->dissolve_same_comdat_group_list ();
458 /* Decide on visibility of all symbols. */
461 function_and_variable_visibility (bool whole_program)
463 struct cgraph_node *node;
466 /* All aliases should be procssed at this point. */
467 gcc_checking_assert (!alias_pairs || !alias_pairs->length ());
469 FOR_EACH_FUNCTION (node)
471 int flags = flags_from_decl_or_type (node->decl);
473 /* Optimize away PURE and CONST constructors and destructors. */
475 && (flags & (ECF_CONST | ECF_PURE))
476 && !(flags & ECF_LOOPING_CONST_OR_PURE))
478 DECL_STATIC_CONSTRUCTOR (node->decl) = 0;
479 DECL_STATIC_DESTRUCTOR (node->decl) = 0;
482 /* Frontends and alias code marks nodes as needed before parsing is finished.
483 We may end up marking as node external nodes where this flag is meaningless
485 if (DECL_EXTERNAL (node->decl) || !node->definition)
487 node->force_output = 0;
488 node->forced_by_abi = 0;
491 /* C++ FE on lack of COMDAT support create local COMDAT functions
492 (that ought to be shared but can not due to object format
493 limitations). It is necessary to keep the flag to make rest of C++ FE
494 happy. Clear the flag here to avoid confusion in middle-end. */
495 if (DECL_COMDAT (node->decl) && !TREE_PUBLIC (node->decl))
496 DECL_COMDAT (node->decl) = 0;
498 /* For external decls stop tracking same_comdat_group. It doesn't matter
499 what comdat group they are in when they won't be emitted in this TU. */
500 if (node->same_comdat_group && DECL_EXTERNAL (node->decl))
502 #ifdef ENABLE_CHECKING
505 for (n = node->same_comdat_group;
507 n = n->same_comdat_group)
508 /* If at least one of same comdat group functions is external,
509 all of them have to be, otherwise it is a front-end bug. */
510 gcc_assert (DECL_EXTERNAL (n->decl));
512 node->dissolve_same_comdat_group_list ();
514 gcc_assert ((!DECL_WEAK (node->decl)
515 && !DECL_COMDAT (node->decl))
516 || TREE_PUBLIC (node->decl)
518 || DECL_EXTERNAL (node->decl));
519 if (cgraph_externally_visible_p (node, whole_program))
521 gcc_assert (!node->global.inlined_to);
522 node->externally_visible = true;
526 node->externally_visible = false;
527 node->forced_by_abi = false;
529 if (!node->externally_visible
530 && node->definition && !node->weakref
531 && !DECL_EXTERNAL (node->decl))
533 gcc_assert (whole_program || in_lto_p
534 || !TREE_PUBLIC (node->decl));
535 node->unique_name = ((node->resolution == LDPR_PREVAILING_DEF_IRONLY
537 || node->resolution == LDPR_PREVAILING_DEF_IRONLY_EXP)
538 && TREE_PUBLIC (node->decl));
539 node->resolution = LDPR_PREVAILING_DEF_IRONLY;
540 if (node->same_comdat_group && TREE_PUBLIC (node->decl))
542 symtab_node *next = node;
544 /* Set all members of comdat group local. */
545 if (node->same_comdat_group)
546 for (next = node->same_comdat_group;
548 next = next->same_comdat_group)
550 next->set_comdat_group (NULL);
552 next->set_section (NULL);
553 next->make_decl_local ();
554 next->unique_name = ((next->resolution == LDPR_PREVAILING_DEF_IRONLY
556 || next->resolution == LDPR_PREVAILING_DEF_IRONLY_EXP)
557 && TREE_PUBLIC (next->decl));
559 /* cgraph_externally_visible_p has already checked all other nodes
560 in the group and they will all be made local. We need to
561 dissolve the group at once so that the predicate does not
563 node->dissolve_same_comdat_group_list ();
565 if (TREE_PUBLIC (node->decl))
566 node->set_comdat_group (NULL);
567 if (DECL_COMDAT (node->decl) && !node->alias)
568 node->set_section (NULL);
569 node->make_decl_local ();
572 if (node->thunk.thunk_p
573 && !node->thunk.add_pointer_bounds_args
574 && TREE_PUBLIC (node->decl))
576 struct cgraph_node *decl_node = node;
578 decl_node = decl_node->callees->callee->function_symbol ();
580 /* Thunks have the same visibility as function they are attached to.
581 Make sure the C++ front end set this up properly. */
582 if (DECL_ONE_ONLY (decl_node->decl))
584 gcc_checking_assert (DECL_COMDAT (node->decl)
585 == DECL_COMDAT (decl_node->decl));
586 gcc_checking_assert (node->in_same_comdat_group_p (decl_node));
587 gcc_checking_assert (node->same_comdat_group);
589 node->forced_by_abi = decl_node->forced_by_abi;
590 if (DECL_EXTERNAL (decl_node->decl))
591 DECL_EXTERNAL (node->decl) = 1;
594 update_visibility_by_resolution_info (node);
596 FOR_EACH_DEFINED_FUNCTION (node)
598 if (!node->local.local)
599 node->local.local |= node->local_p ();
601 /* If we know that function can not be overwritten by a different semantics
602 and moreover its section can not be discarded, replace all direct calls
603 by calls to an noninterposable alias. This make dynamic linking
604 cheaper and enable more optimization.
606 TODO: We can also update virtual tables. */
608 && can_replace_by_local_alias (node))
610 cgraph_node *alias = dyn_cast<cgraph_node *>
611 (node->noninterposable_alias ());
613 if (alias && alias != node)
615 while (node->callers)
617 struct cgraph_edge *e = node->callers;
619 e->redirect_callee (alias);
620 if (gimple_has_body_p (e->caller->decl))
622 push_cfun (DECL_STRUCT_FUNCTION (e->caller->decl));
623 e->redirect_call_stmt_to_callee ();
630 FOR_EACH_VARIABLE (vnode)
632 /* weak flag makes no sense on local variables. */
633 gcc_assert (!DECL_WEAK (vnode->decl)
635 || TREE_PUBLIC (vnode->decl)
636 || DECL_EXTERNAL (vnode->decl));
637 /* In several cases declarations can not be common:
639 - when declaration has initializer
641 - when it has specific section
642 - when it resides in non-generic address space.
643 - if declaration is local, it will get into .local common section
644 so common flag is not needed. Frontends still produce these in
645 certain cases, such as for:
647 static int a __attribute__ ((common))
649 Canonicalize things here and clear the redundant flag. */
650 if (DECL_COMMON (vnode->decl)
651 && (!(TREE_PUBLIC (vnode->decl)
652 || DECL_EXTERNAL (vnode->decl))
653 || (DECL_INITIAL (vnode->decl)
654 && DECL_INITIAL (vnode->decl) != error_mark_node)
655 || DECL_WEAK (vnode->decl)
656 || DECL_SECTION_NAME (vnode->decl) != NULL
657 || ! (ADDR_SPACE_GENERIC_P
658 (TYPE_ADDR_SPACE (TREE_TYPE (vnode->decl))))))
659 DECL_COMMON (vnode->decl) = 0;
661 FOR_EACH_DEFINED_VARIABLE (vnode)
663 if (!vnode->definition)
665 if (vnode->externally_visible_p ())
666 vnode->externally_visible = true;
669 vnode->externally_visible = false;
670 vnode->forced_by_abi = false;
672 if (lookup_attribute ("no_reorder",
673 DECL_ATTRIBUTES (vnode->decl)))
674 vnode->no_reorder = 1;
675 if (!vnode->externally_visible
678 gcc_assert (in_lto_p || whole_program || !TREE_PUBLIC (vnode->decl));
679 vnode->unique_name = ((vnode->resolution == LDPR_PREVAILING_DEF_IRONLY
680 || vnode->resolution == LDPR_PREVAILING_DEF_IRONLY_EXP)
681 && TREE_PUBLIC (vnode->decl));
682 if (vnode->same_comdat_group && TREE_PUBLIC (vnode->decl))
684 symtab_node *next = vnode;
686 /* Set all members of comdat group local. */
687 if (vnode->same_comdat_group)
688 for (next = vnode->same_comdat_group;
690 next = next->same_comdat_group)
692 next->set_comdat_group (NULL);
694 next->set_section (NULL);
695 next->make_decl_local ();
696 next->unique_name = ((next->resolution == LDPR_PREVAILING_DEF_IRONLY
698 || next->resolution == LDPR_PREVAILING_DEF_IRONLY_EXP)
699 && TREE_PUBLIC (next->decl));
701 vnode->dissolve_same_comdat_group_list ();
703 if (TREE_PUBLIC (vnode->decl))
704 vnode->set_comdat_group (NULL);
705 if (DECL_COMDAT (vnode->decl) && !vnode->alias)
706 vnode->set_section (NULL);
707 vnode->make_decl_local ();
708 vnode->resolution = LDPR_PREVAILING_DEF_IRONLY;
710 update_visibility_by_resolution_info (vnode);
712 /* Update virtual tables to point to local aliases where possible. */
713 if (DECL_VIRTUAL_P (vnode->decl)
714 && !DECL_EXTERNAL (vnode->decl))
720 /* See if there is something to update. */
721 for (i = 0; vnode->iterate_referring (i, ref); i++)
722 if (ref->use == IPA_REF_ADDR
723 && can_replace_by_local_alias_in_vtable (ref->referred))
730 hash_set<tree> visited_nodes;
732 vnode->get_constructor ();
733 walk_tree (&DECL_INITIAL (vnode->decl),
734 update_vtable_references, NULL, &visited_nodes);
735 vnode->remove_all_references ();
736 record_references_in_initializer (vnode->decl, false);
743 fprintf (dump_file, "\nMarking local functions:");
744 FOR_EACH_DEFINED_FUNCTION (node)
745 if (node->local.local)
746 fprintf (dump_file, " %s", node->name ());
747 fprintf (dump_file, "\n\n");
748 fprintf (dump_file, "\nMarking externally visible functions:");
749 FOR_EACH_DEFINED_FUNCTION (node)
750 if (node->externally_visible)
751 fprintf (dump_file, " %s", node->name ());
752 fprintf (dump_file, "\n\n");
753 fprintf (dump_file, "\nMarking externally visible variables:");
754 FOR_EACH_DEFINED_VARIABLE (vnode)
755 if (vnode->externally_visible)
756 fprintf (dump_file, " %s", vnode->name ());
757 fprintf (dump_file, "\n\n");
759 symtab->function_flags_ready = true;
763 /* Local function pass handling visibilities. This happens before LTO streaming
764 so in particular -fwhole-program should be ignored at this level. */
768 const pass_data pass_data_ipa_function_and_variable_visibility =
770 SIMPLE_IPA_PASS, /* type */
771 "visibility", /* name */
772 OPTGROUP_NONE, /* optinfo_flags */
773 TV_CGRAPHOPT, /* tv_id */
774 0, /* properties_required */
775 0, /* properties_provided */
776 0, /* properties_destroyed */
777 0, /* todo_flags_start */
778 ( TODO_remove_functions | TODO_dump_symtab ), /* todo_flags_finish */
781 /* Bring functions local at LTO time with -fwhole-program. */
784 whole_program_function_and_variable_visibility (void)
786 function_and_variable_visibility (flag_whole_program);
788 ipa_discover_readonly_nonaddressable_vars ();
796 const pass_data pass_data_ipa_whole_program_visibility =
799 "whole-program", /* name */
800 OPTGROUP_NONE, /* optinfo_flags */
801 TV_CGRAPHOPT, /* tv_id */
802 0, /* properties_required */
803 0, /* properties_provided */
804 0, /* properties_destroyed */
805 0, /* todo_flags_start */
806 ( TODO_remove_functions | TODO_dump_symtab ), /* todo_flags_finish */
809 class pass_ipa_whole_program_visibility : public ipa_opt_pass_d
812 pass_ipa_whole_program_visibility (gcc::context *ctxt)
813 : ipa_opt_pass_d (pass_data_ipa_whole_program_visibility, ctxt,
814 NULL, /* generate_summary */
815 NULL, /* write_summary */
816 NULL, /* read_summary */
817 NULL, /* write_optimization_summary */
818 NULL, /* read_optimization_summary */
819 NULL, /* stmt_fixup */
820 0, /* function_transform_todo_flags_start */
821 NULL, /* function_transform */
822 NULL) /* variable_transform */
825 /* opt_pass methods: */
827 virtual bool gate (function *)
829 /* Do not re-run on ltrans stage. */
832 virtual unsigned int execute (function *)
834 return whole_program_function_and_variable_visibility ();
837 }; // class pass_ipa_whole_program_visibility
842 make_pass_ipa_whole_program_visibility (gcc::context *ctxt)
844 return new pass_ipa_whole_program_visibility (ctxt);
847 class pass_ipa_function_and_variable_visibility : public simple_ipa_opt_pass
850 pass_ipa_function_and_variable_visibility (gcc::context *ctxt)
851 : simple_ipa_opt_pass (pass_data_ipa_function_and_variable_visibility,
855 /* opt_pass methods: */
856 virtual unsigned int execute (function *)
858 return function_and_variable_visibility (flag_whole_program && !flag_lto);
861 }; // class pass_ipa_function_and_variable_visibility
863 simple_ipa_opt_pass *
864 make_pass_ipa_function_and_variable_visibility (gcc::context *ctxt)
866 return new pass_ipa_function_and_variable_visibility (ctxt);