2 Copyright (C) 2003-2014 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"
81 #include "tree-pass.h"
83 #include "gimple-expr.h"
86 /* Return true when NODE can not be local. Worker for cgraph_local_node_p. */
89 cgraph_node::non_local_p (struct cgraph_node
*node
, void *data ATTRIBUTE_UNUSED
)
91 /* FIXME: Aliases can be local, but i386 gets thunks wrong then. */
92 return !(node
->only_called_directly_or_aliased_p ()
93 && !node
->has_aliases_p ()
95 && !DECL_EXTERNAL (node
->decl
)
96 && !node
->externally_visible
97 && !node
->used_from_other_partition
98 && !node
->in_other_partition
);
101 /* Return true when function can be marked local. */
104 cgraph_node::local_p (void)
106 cgraph_node
*n
= ultimate_alias_target ();
108 /* FIXME: thunks can be considered local, but we need prevent i386
109 from attempting to change calling convention of them. */
110 if (n
->thunk
.thunk_p
)
112 return !n
->call_for_symbol_thunks_and_aliases (cgraph_node::non_local_p
,
117 /* Return true when there is a reference to node and it is not vtable. */
120 symtab_node::address_taken_from_non_vtable_p (void)
123 struct ipa_ref
*ref
= NULL
;
125 for (i
= 0; iterate_referring (i
, ref
); i
++)
126 if (ref
->use
== IPA_REF_ADDR
)
129 if (is_a
<cgraph_node
*> (ref
->referring
))
131 node
= dyn_cast
<varpool_node
*> (ref
->referring
);
132 if (!DECL_VIRTUAL_P (node
->decl
))
138 /* A helper for comdat_can_be_unshared_p. */
141 comdat_can_be_unshared_p_1 (symtab_node
*node
)
143 if (!node
->externally_visible
)
145 /* When address is taken, we don't know if equality comparison won't
146 break eventually. Exception are virutal functions, C++
147 constructors/destructors and vtables, where this is not possible by
148 language standard. */
149 if (!DECL_VIRTUAL_P (node
->decl
)
150 && (TREE_CODE (node
->decl
) != FUNCTION_DECL
151 || (!DECL_CXX_CONSTRUCTOR_P (node
->decl
)
152 && !DECL_CXX_DESTRUCTOR_P (node
->decl
)))
153 && node
->address_taken_from_non_vtable_p ())
156 /* If the symbol is used in some weird way, better to not touch it. */
157 if (node
->force_output
)
160 /* Explicit instantiations needs to be output when possibly
162 if (node
->forced_by_abi
163 && TREE_PUBLIC (node
->decl
)
164 && (node
->resolution
!= LDPR_PREVAILING_DEF_IRONLY
165 && !flag_whole_program
))
168 /* Non-readonly and volatile variables can not be duplicated. */
169 if (is_a
<varpool_node
*> (node
)
170 && (!TREE_READONLY (node
->decl
)
171 || TREE_THIS_VOLATILE (node
->decl
)))
176 /* COMDAT functions must be shared only if they have address taken,
177 otherwise we can produce our own private implementation with
179 Return true when turning COMDAT functoin static can not lead to wrong
180 code when the resulting object links with a library defining same COMDAT.
182 Virtual functions do have their addresses taken from the vtables,
183 but in C++ there is no way to compare their addresses for equality. */
186 comdat_can_be_unshared_p (symtab_node
*node
)
188 if (!comdat_can_be_unshared_p_1 (node
))
190 if (node
->same_comdat_group
)
194 /* If more than one function is in the same COMDAT group, it must
195 be shared even if just one function in the comdat group has
197 for (next
= node
->same_comdat_group
;
198 next
!= node
; next
= next
->same_comdat_group
)
199 if (!comdat_can_be_unshared_p_1 (next
))
205 /* Return true when function NODE should be considered externally visible. */
208 cgraph_externally_visible_p (struct cgraph_node
*node
,
211 if (!node
->definition
)
213 if (!TREE_PUBLIC (node
->decl
)
214 || DECL_EXTERNAL (node
->decl
))
217 /* Do not try to localize built-in functions yet. One of problems is that we
218 end up mangling their asm for WHOPR that makes it impossible to call them
219 using the implicit built-in declarations anymore. Similarly this enables
220 us to remove them as unreachable before actual calls may appear during
221 expansion or folding. */
222 if (DECL_BUILT_IN (node
->decl
))
225 /* If linker counts on us, we must preserve the function. */
226 if (node
->used_from_object_file_p ())
228 if (DECL_PRESERVE_P (node
->decl
))
230 if (lookup_attribute ("externally_visible",
231 DECL_ATTRIBUTES (node
->decl
)))
233 if (TARGET_DLLIMPORT_DECL_ATTRIBUTES
234 && lookup_attribute ("dllexport",
235 DECL_ATTRIBUTES (node
->decl
)))
237 if (node
->resolution
== LDPR_PREVAILING_DEF_IRONLY
)
239 /* When doing LTO or whole program, we can bring COMDAT functoins static.
240 This improves code quality and we know we will duplicate them at most twice
241 (in the case that we are not using plugin and link with object file
242 implementing same COMDAT) */
243 if ((in_lto_p
|| whole_program
)
244 && DECL_COMDAT (node
->decl
)
245 && comdat_can_be_unshared_p (node
))
248 /* When doing link time optimizations, hidden symbols become local. */
250 && (DECL_VISIBILITY (node
->decl
) == VISIBILITY_HIDDEN
251 || DECL_VISIBILITY (node
->decl
) == VISIBILITY_INTERNAL
)
252 /* Be sure that node is defined in IR file, not in other object
253 file. In that case we don't set used_from_other_object_file. */
256 else if (!whole_program
)
259 if (MAIN_NAME_P (DECL_NAME (node
->decl
)))
265 /* Return true when variable should be considered externally visible. */
268 varpool_node::externally_visible_p (void)
270 if (DECL_EXTERNAL (decl
))
273 if (!TREE_PUBLIC (decl
))
276 /* If linker counts on us, we must preserve the function. */
277 if (used_from_object_file_p ())
280 /* Bringing TLS variables local may cause dynamic linker failures
281 on limits of static TLS vars. */
282 if (DECL_THREAD_LOCAL_P (decl
)
283 && (DECL_TLS_MODEL (decl
) != TLS_MODEL_EMULATED
284 && DECL_TLS_MODEL (decl
) != TLS_MODEL_INITIAL_EXEC
))
287 if (DECL_HARD_REGISTER (decl
))
289 if (DECL_PRESERVE_P (decl
))
291 if (lookup_attribute ("externally_visible",
292 DECL_ATTRIBUTES (decl
)))
294 if (TARGET_DLLIMPORT_DECL_ATTRIBUTES
295 && lookup_attribute ("dllexport",
296 DECL_ATTRIBUTES (decl
)))
299 /* See if we have linker information about symbol not being used or
300 if we need to make guess based on the declaration.
302 Even if the linker clams the symbol is unused, never bring internal
303 symbols that are declared by user as used or externally visible.
304 This is needed for i.e. references from asm statements. */
305 if (used_from_object_file_p ())
307 if (resolution
== LDPR_PREVAILING_DEF_IRONLY
)
310 /* As a special case, the COMDAT virtual tables can be unshared.
311 In LTO mode turn vtables into static variables. The variable is readonly,
312 so this does not enable more optimization, but referring static var
313 is faster for dynamic linking. Also this match logic hidding vtables
314 from LTO symbol tables. */
315 if ((in_lto_p
|| flag_whole_program
)
316 && DECL_COMDAT (decl
)
317 && comdat_can_be_unshared_p (this))
320 /* When doing link time optimizations, hidden symbols become local. */
322 && (DECL_VISIBILITY (decl
) == VISIBILITY_HIDDEN
323 || DECL_VISIBILITY (decl
) == VISIBILITY_INTERNAL
)
324 /* Be sure that node is defined in IR file, not in other object
325 file. In that case we don't set used_from_other_object_file. */
328 else if (!flag_whole_program
)
331 /* Do not attempt to privatize COMDATS by default.
332 This would break linking with C++ libraries sharing
335 FIXME: We can do so for readonly vars with no address taken and
336 possibly also for vtables since no direct pointer comparsion is done.
337 It might be interesting to do so to reduce linking overhead. */
338 if (DECL_COMDAT (decl
) || DECL_WEAK (decl
))
343 /* Return true if reference to NODE can be replaced by a local alias.
344 Local aliases save dynamic linking overhead and enable more optimizations.
348 can_replace_by_local_alias (symtab_node
*node
)
350 return (node
->get_availability () > AVAIL_INTERPOSABLE
351 && !decl_binds_to_current_def_p (node
->decl
)
352 && !node
->can_be_discarded_p ());
355 /* Return true if we can replace refernece to NODE by local alias
356 within a virtual table. Generally we can replace function pointers
357 and virtual table pointers. */
360 can_replace_by_local_alias_in_vtable (symtab_node
*node
)
362 if (is_a
<varpool_node
*> (node
)
363 && !DECL_VIRTUAL_P (node
->decl
))
365 return can_replace_by_local_alias (node
);
368 /* walk_tree callback that rewrites initializer references. */
371 update_vtable_references (tree
*tp
, int *walk_subtrees
, void *data ATTRIBUTE_UNUSED
)
373 if (TREE_CODE (*tp
) == VAR_DECL
374 || TREE_CODE (*tp
) == FUNCTION_DECL
)
376 if (can_replace_by_local_alias_in_vtable (symtab_node::get (*tp
)))
377 *tp
= symtab_node::get (*tp
)->noninterposable_alias ()->decl
;
380 else if (IS_TYPE_OR_DECL_P (*tp
))
385 /* In LTO we can remove COMDAT groups and weak symbols.
386 Either turn them into normal symbols or external symbol depending on
390 update_visibility_by_resolution_info (symtab_node
* node
)
394 if (!node
->externally_visible
395 || (!DECL_WEAK (node
->decl
) && !DECL_ONE_ONLY (node
->decl
))
396 || node
->resolution
== LDPR_UNKNOWN
)
399 define
= (node
->resolution
== LDPR_PREVAILING_DEF_IRONLY
400 || node
->resolution
== LDPR_PREVAILING_DEF
401 || node
->resolution
== LDPR_UNDEF
402 || node
->resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
);
404 /* The linker decisions ought to agree in the whole group. */
405 if (node
->same_comdat_group
)
406 for (symtab_node
*next
= node
->same_comdat_group
;
407 next
!= node
; next
= next
->same_comdat_group
)
408 gcc_assert (!next
->externally_visible
409 || define
== (next
->resolution
== LDPR_PREVAILING_DEF_IRONLY
410 || next
->resolution
== LDPR_PREVAILING_DEF
411 || next
->resolution
== LDPR_UNDEF
412 || next
->resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
));
414 if (node
->same_comdat_group
)
415 for (symtab_node
*next
= node
->same_comdat_group
;
416 next
!= node
; next
= next
->same_comdat_group
)
418 next
->set_comdat_group (NULL
);
419 DECL_WEAK (next
->decl
) = false;
420 if (next
->externally_visible
422 DECL_EXTERNAL (next
->decl
) = true;
424 node
->set_comdat_group (NULL
);
425 DECL_WEAK (node
->decl
) = false;
427 DECL_EXTERNAL (node
->decl
) = true;
428 node
->dissolve_same_comdat_group_list ();
431 /* Decide on visibility of all symbols. */
434 function_and_variable_visibility (bool whole_program
)
436 struct cgraph_node
*node
;
439 /* All aliases should be procssed at this point. */
440 gcc_checking_assert (!alias_pairs
|| !alias_pairs
->length ());
442 FOR_EACH_FUNCTION (node
)
444 int flags
= flags_from_decl_or_type (node
->decl
);
446 /* Optimize away PURE and CONST constructors and destructors. */
448 && (flags
& (ECF_CONST
| ECF_PURE
))
449 && !(flags
& ECF_LOOPING_CONST_OR_PURE
))
451 DECL_STATIC_CONSTRUCTOR (node
->decl
) = 0;
452 DECL_STATIC_DESTRUCTOR (node
->decl
) = 0;
455 /* Frontends and alias code marks nodes as needed before parsing is finished.
456 We may end up marking as node external nodes where this flag is meaningless
458 if (DECL_EXTERNAL (node
->decl
) || !node
->definition
)
460 node
->force_output
= 0;
461 node
->forced_by_abi
= 0;
464 /* C++ FE on lack of COMDAT support create local COMDAT functions
465 (that ought to be shared but can not due to object format
466 limitations). It is necessary to keep the flag to make rest of C++ FE
467 happy. Clear the flag here to avoid confusion in middle-end. */
468 if (DECL_COMDAT (node
->decl
) && !TREE_PUBLIC (node
->decl
))
469 DECL_COMDAT (node
->decl
) = 0;
471 /* For external decls stop tracking same_comdat_group. It doesn't matter
472 what comdat group they are in when they won't be emitted in this TU. */
473 if (node
->same_comdat_group
&& DECL_EXTERNAL (node
->decl
))
475 #ifdef ENABLE_CHECKING
478 for (n
= node
->same_comdat_group
;
480 n
= n
->same_comdat_group
)
481 /* If at least one of same comdat group functions is external,
482 all of them have to be, otherwise it is a front-end bug. */
483 gcc_assert (DECL_EXTERNAL (n
->decl
));
485 node
->dissolve_same_comdat_group_list ();
487 gcc_assert ((!DECL_WEAK (node
->decl
)
488 && !DECL_COMDAT (node
->decl
))
489 || TREE_PUBLIC (node
->decl
)
491 || DECL_EXTERNAL (node
->decl
));
492 if (cgraph_externally_visible_p (node
, whole_program
))
494 gcc_assert (!node
->global
.inlined_to
);
495 node
->externally_visible
= true;
499 node
->externally_visible
= false;
500 node
->forced_by_abi
= false;
502 if (!node
->externally_visible
503 && node
->definition
&& !node
->weakref
504 && !DECL_EXTERNAL (node
->decl
))
506 gcc_assert (whole_program
|| in_lto_p
507 || !TREE_PUBLIC (node
->decl
));
508 node
->unique_name
= ((node
->resolution
== LDPR_PREVAILING_DEF_IRONLY
510 || node
->resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
)
511 && TREE_PUBLIC (node
->decl
));
512 node
->resolution
= LDPR_PREVAILING_DEF_IRONLY
;
513 if (node
->same_comdat_group
&& TREE_PUBLIC (node
->decl
))
515 symtab_node
*next
= node
;
517 /* Set all members of comdat group local. */
518 if (node
->same_comdat_group
)
519 for (next
= node
->same_comdat_group
;
521 next
= next
->same_comdat_group
)
523 next
->set_comdat_group (NULL
);
525 next
->set_section (NULL
);
526 next
->make_decl_local ();
527 next
->unique_name
= ((next
->resolution
== LDPR_PREVAILING_DEF_IRONLY
529 || next
->resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
)
530 && TREE_PUBLIC (next
->decl
));
532 /* cgraph_externally_visible_p has already checked all other nodes
533 in the group and they will all be made local. We need to
534 dissolve the group at once so that the predicate does not
536 node
->dissolve_same_comdat_group_list ();
538 if (TREE_PUBLIC (node
->decl
))
539 node
->set_comdat_group (NULL
);
540 if (DECL_COMDAT (node
->decl
) && !node
->alias
)
541 node
->set_section (NULL
);
542 node
->make_decl_local ();
545 if (node
->thunk
.thunk_p
546 && TREE_PUBLIC (node
->decl
))
548 struct cgraph_node
*decl_node
= node
;
550 decl_node
= decl_node
->callees
->callee
->function_symbol ();
552 /* Thunks have the same visibility as function they are attached to.
553 Make sure the C++ front end set this up properly. */
554 if (DECL_ONE_ONLY (decl_node
->decl
))
556 gcc_checking_assert (DECL_COMDAT (node
->decl
)
557 == DECL_COMDAT (decl_node
->decl
));
558 gcc_checking_assert (node
->in_same_comdat_group_p (decl_node
));
559 gcc_checking_assert (node
->same_comdat_group
);
561 node
->forced_by_abi
= decl_node
->forced_by_abi
;
562 if (DECL_EXTERNAL (decl_node
->decl
))
563 DECL_EXTERNAL (node
->decl
) = 1;
566 update_visibility_by_resolution_info (node
);
568 FOR_EACH_DEFINED_FUNCTION (node
)
570 node
->local
.local
|= node
->local_p ();
572 /* If we know that function can not be overwritten by a different semantics
573 and moreover its section can not be discarded, replace all direct calls
574 by calls to an noninterposable alias. This make dynamic linking
575 cheaper and enable more optimization.
577 TODO: We can also update virtual tables. */
579 && can_replace_by_local_alias (node
))
581 cgraph_node
*alias
= dyn_cast
<cgraph_node
*>
582 (node
->noninterposable_alias ());
584 if (alias
&& alias
!= node
)
586 while (node
->callers
)
588 struct cgraph_edge
*e
= node
->callers
;
590 e
->redirect_callee (alias
);
591 if (gimple_has_body_p (e
->caller
->decl
))
593 push_cfun (DECL_STRUCT_FUNCTION (e
->caller
->decl
));
594 e
->redirect_call_stmt_to_callee ();
601 FOR_EACH_VARIABLE (vnode
)
603 /* weak flag makes no sense on local variables. */
604 gcc_assert (!DECL_WEAK (vnode
->decl
)
606 || TREE_PUBLIC (vnode
->decl
)
607 || DECL_EXTERNAL (vnode
->decl
));
608 /* In several cases declarations can not be common:
610 - when declaration has initializer
612 - when it has specific section
613 - when it resides in non-generic address space.
614 - if declaration is local, it will get into .local common section
615 so common flag is not needed. Frontends still produce these in
616 certain cases, such as for:
618 static int a __attribute__ ((common))
620 Canonicalize things here and clear the redundant flag. */
621 if (DECL_COMMON (vnode
->decl
)
622 && (!(TREE_PUBLIC (vnode
->decl
)
623 || DECL_EXTERNAL (vnode
->decl
))
624 || (DECL_INITIAL (vnode
->decl
)
625 && DECL_INITIAL (vnode
->decl
) != error_mark_node
)
626 || DECL_WEAK (vnode
->decl
)
627 || DECL_SECTION_NAME (vnode
->decl
) != NULL
628 || ! (ADDR_SPACE_GENERIC_P
629 (TYPE_ADDR_SPACE (TREE_TYPE (vnode
->decl
))))))
630 DECL_COMMON (vnode
->decl
) = 0;
632 FOR_EACH_DEFINED_VARIABLE (vnode
)
634 if (!vnode
->definition
)
636 if (vnode
->externally_visible_p ())
637 vnode
->externally_visible
= true;
640 vnode
->externally_visible
= false;
641 vnode
->forced_by_abi
= false;
643 if (!vnode
->externally_visible
646 gcc_assert (in_lto_p
|| whole_program
|| !TREE_PUBLIC (vnode
->decl
));
647 vnode
->unique_name
= ((vnode
->resolution
== LDPR_PREVAILING_DEF_IRONLY
648 || vnode
->resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
)
649 && TREE_PUBLIC (vnode
->decl
));
650 if (vnode
->same_comdat_group
&& TREE_PUBLIC (vnode
->decl
))
652 symtab_node
*next
= vnode
;
654 /* Set all members of comdat group local. */
655 if (vnode
->same_comdat_group
)
656 for (next
= vnode
->same_comdat_group
;
658 next
= next
->same_comdat_group
)
660 next
->set_comdat_group (NULL
);
662 next
->set_section (NULL
);
663 next
->make_decl_local ();
664 next
->unique_name
= ((next
->resolution
== LDPR_PREVAILING_DEF_IRONLY
666 || next
->resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
)
667 && TREE_PUBLIC (next
->decl
));
669 vnode
->dissolve_same_comdat_group_list ();
671 if (TREE_PUBLIC (vnode
->decl
))
672 vnode
->set_comdat_group (NULL
);
673 if (DECL_COMDAT (vnode
->decl
) && !vnode
->alias
)
674 vnode
->set_section (NULL
);
675 vnode
->make_decl_local ();
676 vnode
->resolution
= LDPR_PREVAILING_DEF_IRONLY
;
678 update_visibility_by_resolution_info (vnode
);
680 /* Update virtual tables to point to local aliases where possible. */
681 if (DECL_VIRTUAL_P (vnode
->decl
)
682 && !DECL_EXTERNAL (vnode
->decl
))
688 /* See if there is something to update. */
689 for (i
= 0; vnode
->iterate_referring (i
, ref
); i
++)
690 if (ref
->use
== IPA_REF_ADDR
691 && can_replace_by_local_alias_in_vtable (ref
->referred
))
698 hash_set
<tree
> visited_nodes
;
700 vnode
->get_constructor ();
701 walk_tree (&DECL_INITIAL (vnode
->decl
),
702 update_vtable_references
, NULL
, &visited_nodes
);
703 vnode
->remove_all_references ();
704 record_references_in_initializer (vnode
->decl
, false);
711 fprintf (dump_file
, "\nMarking local functions:");
712 FOR_EACH_DEFINED_FUNCTION (node
)
713 if (node
->local
.local
)
714 fprintf (dump_file
, " %s", node
->name ());
715 fprintf (dump_file
, "\n\n");
716 fprintf (dump_file
, "\nMarking externally visible functions:");
717 FOR_EACH_DEFINED_FUNCTION (node
)
718 if (node
->externally_visible
)
719 fprintf (dump_file
, " %s", node
->name ());
720 fprintf (dump_file
, "\n\n");
721 fprintf (dump_file
, "\nMarking externally visible variables:");
722 FOR_EACH_DEFINED_VARIABLE (vnode
)
723 if (vnode
->externally_visible
)
724 fprintf (dump_file
, " %s", vnode
->name ());
725 fprintf (dump_file
, "\n\n");
727 symtab
->function_flags_ready
= true;
731 /* Local function pass handling visibilities. This happens before LTO streaming
732 so in particular -fwhole-program should be ignored at this level. */
736 const pass_data pass_data_ipa_function_and_variable_visibility
=
738 SIMPLE_IPA_PASS
, /* type */
739 "visibility", /* name */
740 OPTGROUP_NONE
, /* optinfo_flags */
741 TV_CGRAPHOPT
, /* tv_id */
742 0, /* properties_required */
743 0, /* properties_provided */
744 0, /* properties_destroyed */
745 0, /* todo_flags_start */
746 ( TODO_remove_functions
| TODO_dump_symtab
), /* todo_flags_finish */
749 /* Bring functions local at LTO time with -fwhole-program. */
752 whole_program_function_and_variable_visibility (void)
754 function_and_variable_visibility (flag_whole_program
);
756 ipa_discover_readonly_nonaddressable_vars ();
764 const pass_data pass_data_ipa_whole_program_visibility
=
767 "whole-program", /* name */
768 OPTGROUP_NONE
, /* optinfo_flags */
769 TV_CGRAPHOPT
, /* tv_id */
770 0, /* properties_required */
771 0, /* properties_provided */
772 0, /* properties_destroyed */
773 0, /* todo_flags_start */
774 ( TODO_remove_functions
| TODO_dump_symtab
), /* todo_flags_finish */
777 class pass_ipa_whole_program_visibility
: public ipa_opt_pass_d
780 pass_ipa_whole_program_visibility (gcc::context
*ctxt
)
781 : ipa_opt_pass_d (pass_data_ipa_whole_program_visibility
, ctxt
,
782 NULL
, /* generate_summary */
783 NULL
, /* write_summary */
784 NULL
, /* read_summary */
785 NULL
, /* write_optimization_summary */
786 NULL
, /* read_optimization_summary */
787 NULL
, /* stmt_fixup */
788 0, /* function_transform_todo_flags_start */
789 NULL
, /* function_transform */
790 NULL
) /* variable_transform */
793 /* opt_pass methods: */
795 virtual bool gate (function
*)
797 /* Do not re-run on ltrans stage. */
800 virtual unsigned int execute (function
*)
802 return whole_program_function_and_variable_visibility ();
805 }; // class pass_ipa_whole_program_visibility
810 make_pass_ipa_whole_program_visibility (gcc::context
*ctxt
)
812 return new pass_ipa_whole_program_visibility (ctxt
);
815 class pass_ipa_function_and_variable_visibility
: public simple_ipa_opt_pass
818 pass_ipa_function_and_variable_visibility (gcc::context
*ctxt
)
819 : simple_ipa_opt_pass (pass_data_ipa_function_and_variable_visibility
,
823 /* opt_pass methods: */
824 virtual unsigned int execute (function
*)
826 return function_and_variable_visibility (flag_whole_program
&& !flag_lto
);
829 }; // class pass_ipa_function_and_variable_visibility
831 simple_ipa_opt_pass
*
832 make_pass_ipa_function_and_variable_visibility (gcc::context
*ctxt
)
834 return new pass_ipa_function_and_variable_visibility (ctxt
);