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"
82 #include "pointer-set.h"
84 #include "gimple-expr.h"
87 /* Return true when NODE can not be local. Worker for cgraph_local_node_p. */
90 cgraph_non_local_node_p_1 (struct cgraph_node
*node
, void *data ATTRIBUTE_UNUSED
)
92 /* FIXME: Aliases can be local, but i386 gets thunks wrong then. */
93 return !(cgraph_only_called_directly_or_aliased_p (node
)
94 && !ipa_ref_has_aliases_p (&node
->ref_list
)
96 && !DECL_EXTERNAL (node
->decl
)
97 && !node
->externally_visible
98 && !node
->used_from_other_partition
99 && !node
->in_other_partition
);
102 /* Return true when function can be marked local. */
105 cgraph_local_node_p (struct cgraph_node
*node
)
107 struct cgraph_node
*n
= cgraph_function_or_thunk_node (node
, NULL
);
109 /* FIXME: thunks can be considered local, but we need prevent i386
110 from attempting to change calling convention of them. */
111 if (n
->thunk
.thunk_p
)
113 return !cgraph_for_node_and_aliases (n
,
114 cgraph_non_local_node_p_1
, NULL
, true);
118 /* Return true when there is a reference to node and it is not vtable. */
120 address_taken_from_non_vtable_p (symtab_node
*node
)
124 for (i
= 0; ipa_ref_list_referring_iterate (&node
->ref_list
,
126 if (ref
->use
== IPA_REF_ADDR
)
129 if (is_a
<cgraph_node
*> (ref
->referring
))
131 node
= ipa_ref_referring_varpool_node (ref
);
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 && address_taken_from_non_vtable_p (node
))
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 (symtab_used_from_object_file_p (node
))
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 VNODE should be considered externally visible. */
268 varpool_externally_visible_p (varpool_node
*vnode
)
270 if (DECL_EXTERNAL (vnode
->decl
))
273 if (!TREE_PUBLIC (vnode
->decl
))
276 /* If linker counts on us, we must preserve the function. */
277 if (symtab_used_from_object_file_p (vnode
))
280 if (DECL_HARD_REGISTER (vnode
->decl
))
282 if (DECL_PRESERVE_P (vnode
->decl
))
284 if (lookup_attribute ("externally_visible",
285 DECL_ATTRIBUTES (vnode
->decl
)))
287 if (TARGET_DLLIMPORT_DECL_ATTRIBUTES
288 && lookup_attribute ("dllexport",
289 DECL_ATTRIBUTES (vnode
->decl
)))
292 /* See if we have linker information about symbol not being used or
293 if we need to make guess based on the declaration.
295 Even if the linker clams the symbol is unused, never bring internal
296 symbols that are declared by user as used or externally visible.
297 This is needed for i.e. references from asm statements. */
298 if (symtab_used_from_object_file_p (vnode
))
300 if (vnode
->resolution
== LDPR_PREVAILING_DEF_IRONLY
)
303 /* As a special case, the COMDAT virtual tables can be unshared.
304 In LTO mode turn vtables into static variables. The variable is readonly,
305 so this does not enable more optimization, but referring static var
306 is faster for dynamic linking. Also this match logic hidding vtables
307 from LTO symbol tables. */
308 if ((in_lto_p
|| flag_whole_program
)
309 && DECL_COMDAT (vnode
->decl
)
310 && comdat_can_be_unshared_p (vnode
))
313 /* When doing link time optimizations, hidden symbols become local. */
315 && (DECL_VISIBILITY (vnode
->decl
) == VISIBILITY_HIDDEN
316 || DECL_VISIBILITY (vnode
->decl
) == VISIBILITY_INTERNAL
)
317 /* Be sure that node is defined in IR file, not in other object
318 file. In that case we don't set used_from_other_object_file. */
319 && vnode
->definition
)
321 else if (!flag_whole_program
)
324 /* Do not attempt to privatize COMDATS by default.
325 This would break linking with C++ libraries sharing
328 FIXME: We can do so for readonly vars with no address taken and
329 possibly also for vtables since no direct pointer comparsion is done.
330 It might be interesting to do so to reduce linking overhead. */
331 if (DECL_COMDAT (vnode
->decl
) || DECL_WEAK (vnode
->decl
))
336 /* Return true if reference to NODE can be replaced by a local alias.
337 Local aliases save dynamic linking overhead and enable more optimizations.
341 can_replace_by_local_alias (symtab_node
*node
)
343 return (symtab_node_availability (node
) > AVAIL_OVERWRITABLE
344 && !decl_binds_to_current_def_p (node
->decl
)
345 && !symtab_can_be_discarded (node
));
348 /* Return true if we can replace refernece to NODE by local alias
349 within a virtual table. Generally we can replace function pointers
350 and virtual table pointers. */
353 can_replace_by_local_alias_in_vtable (symtab_node
*node
)
355 if (is_a
<varpool_node
*> (node
)
356 && !DECL_VIRTUAL_P (node
->decl
))
358 return can_replace_by_local_alias (node
);
361 /* walk_tree callback that rewrites initializer references. */
364 update_vtable_references (tree
*tp
, int *walk_subtrees
, void *data ATTRIBUTE_UNUSED
)
366 if (TREE_CODE (*tp
) == VAR_DECL
367 || TREE_CODE (*tp
) == FUNCTION_DECL
)
369 if (can_replace_by_local_alias_in_vtable (symtab_get_node (*tp
)))
370 *tp
= symtab_nonoverwritable_alias (symtab_get_node (*tp
))->decl
;
373 else if (IS_TYPE_OR_DECL_P (*tp
))
378 /* In LTO we can remove COMDAT groups and weak symbols.
379 Either turn them into normal symbols or external symbol depending on
383 update_visibility_by_resolution_info (symtab_node
* node
)
387 if (!node
->externally_visible
388 || (!DECL_WEAK (node
->decl
) && !DECL_ONE_ONLY (node
->decl
))
389 || node
->resolution
== LDPR_UNKNOWN
)
392 define
= (node
->resolution
== LDPR_PREVAILING_DEF_IRONLY
393 || node
->resolution
== LDPR_PREVAILING_DEF
394 || node
->resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
);
396 /* The linker decisions ought to agree in the whole group. */
397 if (node
->same_comdat_group
)
398 for (symtab_node
*next
= node
->same_comdat_group
;
399 next
!= node
; next
= next
->same_comdat_group
)
400 gcc_assert (!node
->externally_visible
401 || define
== (next
->resolution
== LDPR_PREVAILING_DEF_IRONLY
402 || next
->resolution
== LDPR_PREVAILING_DEF
403 || next
->resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
));
405 if (node
->same_comdat_group
)
406 for (symtab_node
*next
= node
->same_comdat_group
;
407 next
!= node
; next
= next
->same_comdat_group
)
409 next
->set_comdat_group (NULL
);
410 DECL_WEAK (next
->decl
) = false;
411 if (next
->externally_visible
413 DECL_EXTERNAL (next
->decl
) = true;
415 node
->set_comdat_group (NULL
);
416 DECL_WEAK (node
->decl
) = false;
418 DECL_EXTERNAL (node
->decl
) = true;
419 symtab_dissolve_same_comdat_group_list (node
);
422 /* Decide on visibility of all symbols. */
425 function_and_variable_visibility (bool whole_program
)
427 struct cgraph_node
*node
;
430 /* All aliases should be procssed at this point. */
431 gcc_checking_assert (!alias_pairs
|| !alias_pairs
->length ());
433 FOR_EACH_FUNCTION (node
)
435 int flags
= flags_from_decl_or_type (node
->decl
);
437 /* Optimize away PURE and CONST constructors and destructors. */
439 && (flags
& (ECF_CONST
| ECF_PURE
))
440 && !(flags
& ECF_LOOPING_CONST_OR_PURE
))
442 DECL_STATIC_CONSTRUCTOR (node
->decl
) = 0;
443 DECL_STATIC_DESTRUCTOR (node
->decl
) = 0;
446 /* Frontends and alias code marks nodes as needed before parsing is finished.
447 We may end up marking as node external nodes where this flag is meaningless
449 if (DECL_EXTERNAL (node
->decl
) || !node
->definition
)
451 node
->force_output
= 0;
452 node
->forced_by_abi
= 0;
455 /* C++ FE on lack of COMDAT support create local COMDAT functions
456 (that ought to be shared but can not due to object format
457 limitations). It is necessary to keep the flag to make rest of C++ FE
458 happy. Clear the flag here to avoid confusion in middle-end. */
459 if (DECL_COMDAT (node
->decl
) && !TREE_PUBLIC (node
->decl
))
460 DECL_COMDAT (node
->decl
) = 0;
462 /* For external decls stop tracking same_comdat_group. It doesn't matter
463 what comdat group they are in when they won't be emitted in this TU. */
464 if (node
->same_comdat_group
&& DECL_EXTERNAL (node
->decl
))
466 #ifdef ENABLE_CHECKING
469 for (n
= node
->same_comdat_group
;
471 n
= n
->same_comdat_group
)
472 /* If at least one of same comdat group functions is external,
473 all of them have to be, otherwise it is a front-end bug. */
474 gcc_assert (DECL_EXTERNAL (n
->decl
));
476 symtab_dissolve_same_comdat_group_list (node
);
478 gcc_assert ((!DECL_WEAK (node
->decl
)
479 && !DECL_COMDAT (node
->decl
))
480 || TREE_PUBLIC (node
->decl
)
482 || DECL_EXTERNAL (node
->decl
));
483 if (cgraph_externally_visible_p (node
, whole_program
))
485 gcc_assert (!node
->global
.inlined_to
);
486 node
->externally_visible
= true;
490 node
->externally_visible
= false;
491 node
->forced_by_abi
= false;
493 if (!node
->externally_visible
494 && node
->definition
&& !node
->weakref
495 && !DECL_EXTERNAL (node
->decl
))
497 gcc_assert (whole_program
|| in_lto_p
498 || !TREE_PUBLIC (node
->decl
));
499 node
->unique_name
= ((node
->resolution
== LDPR_PREVAILING_DEF_IRONLY
501 || node
->resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
)
502 && TREE_PUBLIC (node
->decl
));
503 node
->resolution
= LDPR_PREVAILING_DEF_IRONLY
;
504 if (node
->same_comdat_group
&& TREE_PUBLIC (node
->decl
))
506 symtab_node
*next
= node
;
508 /* Set all members of comdat group local. */
509 if (node
->same_comdat_group
)
510 for (next
= node
->same_comdat_group
;
512 next
= next
->same_comdat_group
)
514 next
->set_comdat_group (NULL
);
516 next
->set_section (NULL
);
517 symtab_make_decl_local (next
->decl
);
518 next
->unique_name
= ((next
->resolution
== LDPR_PREVAILING_DEF_IRONLY
520 || next
->resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
)
521 && TREE_PUBLIC (next
->decl
));
523 /* cgraph_externally_visible_p has already checked all other nodes
524 in the group and they will all be made local. We need to
525 dissolve the group at once so that the predicate does not
527 symtab_dissolve_same_comdat_group_list (node
);
529 if (TREE_PUBLIC (node
->decl
))
530 node
->set_comdat_group (NULL
);
531 if (DECL_COMDAT (node
->decl
) && !node
->alias
)
532 node
->set_section (NULL
);
533 symtab_make_decl_local (node
->decl
);
536 if (node
->thunk
.thunk_p
537 && TREE_PUBLIC (node
->decl
))
539 struct cgraph_node
*decl_node
= node
;
541 decl_node
= cgraph_function_node (decl_node
->callees
->callee
, NULL
);
543 /* Thunks have the same visibility as function they are attached to.
544 Make sure the C++ front end set this up properly. */
545 if (DECL_ONE_ONLY (decl_node
->decl
))
547 gcc_checking_assert (DECL_COMDAT (node
->decl
)
548 == DECL_COMDAT (decl_node
->decl
));
549 gcc_checking_assert (symtab_in_same_comdat_p (node
, decl_node
));
550 gcc_checking_assert (node
->same_comdat_group
);
552 node
->forced_by_abi
= decl_node
->forced_by_abi
;
553 if (DECL_EXTERNAL (decl_node
->decl
))
554 DECL_EXTERNAL (node
->decl
) = 1;
557 update_visibility_by_resolution_info (node
);
559 FOR_EACH_DEFINED_FUNCTION (node
)
561 node
->local
.local
|= cgraph_local_node_p (node
);
563 /* If we know that function can not be overwritten by a different semantics
564 and moreover its section can not be discarded, replace all direct calls
565 by calls to an nonoverwritable alias. This make dynamic linking
566 cheaper and enable more optimization.
568 TODO: We can also update virtual tables. */
569 if (node
->callers
&& can_replace_by_local_alias (node
))
571 struct cgraph_node
*alias
= cgraph (symtab_nonoverwritable_alias (node
));
573 if (alias
&& alias
!= node
)
575 while (node
->callers
)
577 struct cgraph_edge
*e
= node
->callers
;
579 cgraph_redirect_edge_callee (e
, alias
);
580 if (gimple_has_body_p (e
->caller
->decl
))
582 push_cfun (DECL_STRUCT_FUNCTION (e
->caller
->decl
));
583 cgraph_redirect_edge_call_stmt_to_callee (e
);
590 FOR_EACH_VARIABLE (vnode
)
592 /* weak flag makes no sense on local variables. */
593 gcc_assert (!DECL_WEAK (vnode
->decl
)
595 || TREE_PUBLIC (vnode
->decl
)
596 || DECL_EXTERNAL (vnode
->decl
));
597 /* In several cases declarations can not be common:
599 - when declaration has initializer
601 - when it has specific section
602 - when it resides in non-generic address space.
603 - if declaration is local, it will get into .local common section
604 so common flag is not needed. Frontends still produce these in
605 certain cases, such as for:
607 static int a __attribute__ ((common))
609 Canonicalize things here and clear the redundant flag. */
610 if (DECL_COMMON (vnode
->decl
)
611 && (!(TREE_PUBLIC (vnode
->decl
)
612 || DECL_EXTERNAL (vnode
->decl
))
613 || (DECL_INITIAL (vnode
->decl
)
614 && DECL_INITIAL (vnode
->decl
) != error_mark_node
)
615 || DECL_WEAK (vnode
->decl
)
616 || DECL_SECTION_NAME (vnode
->decl
) != NULL
617 || ! (ADDR_SPACE_GENERIC_P
618 (TYPE_ADDR_SPACE (TREE_TYPE (vnode
->decl
))))))
619 DECL_COMMON (vnode
->decl
) = 0;
621 FOR_EACH_DEFINED_VARIABLE (vnode
)
623 if (!vnode
->definition
)
625 if (varpool_externally_visible_p (vnode
))
626 vnode
->externally_visible
= true;
629 vnode
->externally_visible
= false;
630 vnode
->forced_by_abi
= false;
632 if (!vnode
->externally_visible
635 gcc_assert (in_lto_p
|| whole_program
|| !TREE_PUBLIC (vnode
->decl
));
636 vnode
->unique_name
= ((vnode
->resolution
== LDPR_PREVAILING_DEF_IRONLY
637 || vnode
->resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
)
638 && TREE_PUBLIC (vnode
->decl
));
639 if (vnode
->same_comdat_group
&& TREE_PUBLIC (vnode
->decl
))
641 symtab_node
*next
= vnode
;
643 /* Set all members of comdat group local. */
644 if (vnode
->same_comdat_group
)
645 for (next
= vnode
->same_comdat_group
;
647 next
= next
->same_comdat_group
)
649 next
->set_comdat_group (NULL
);
651 next
->set_section (NULL
);
652 symtab_make_decl_local (next
->decl
);
653 next
->unique_name
= ((next
->resolution
== LDPR_PREVAILING_DEF_IRONLY
655 || next
->resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
)
656 && TREE_PUBLIC (next
->decl
));
658 symtab_dissolve_same_comdat_group_list (vnode
);
660 if (TREE_PUBLIC (vnode
->decl
))
661 vnode
->set_comdat_group (NULL
);
662 if (DECL_COMDAT (vnode
->decl
) && !vnode
->alias
)
663 vnode
->set_section (NULL
);
664 symtab_make_decl_local (vnode
->decl
);
665 vnode
->resolution
= LDPR_PREVAILING_DEF_IRONLY
;
667 update_visibility_by_resolution_info (vnode
);
669 /* Update virtual tables to point to local aliases where possible. */
670 if (DECL_VIRTUAL_P (vnode
->decl
)
671 && !DECL_EXTERNAL (vnode
->decl
)
672 /* FIXME: currently this optimization breaks on AIX. Disable it for targets
673 without comdat support for now. */
674 && SUPPORTS_ONE_ONLY
)
680 /* See if there is something to update. */
681 for (i
= 0; ipa_ref_list_referring_iterate (&vnode
->ref_list
,
683 if (ref
->use
== IPA_REF_ADDR
684 && can_replace_by_local_alias_in_vtable (ref
->referred
))
691 struct pointer_set_t
*visited_nodes
= pointer_set_create ();
692 walk_tree (&DECL_INITIAL (vnode
->decl
),
693 update_vtable_references
, NULL
, visited_nodes
);
694 pointer_set_destroy (visited_nodes
);
695 ipa_remove_all_references (&vnode
->ref_list
);
696 record_references_in_initializer (vnode
->decl
, false);
703 fprintf (dump_file
, "\nMarking local functions:");
704 FOR_EACH_DEFINED_FUNCTION (node
)
705 if (node
->local
.local
)
706 fprintf (dump_file
, " %s", node
->name ());
707 fprintf (dump_file
, "\n\n");
708 fprintf (dump_file
, "\nMarking externally visible functions:");
709 FOR_EACH_DEFINED_FUNCTION (node
)
710 if (node
->externally_visible
)
711 fprintf (dump_file
, " %s", node
->name ());
712 fprintf (dump_file
, "\n\n");
713 fprintf (dump_file
, "\nMarking externally visible variables:");
714 FOR_EACH_DEFINED_VARIABLE (vnode
)
715 if (vnode
->externally_visible
)
716 fprintf (dump_file
, " %s", vnode
->name ());
717 fprintf (dump_file
, "\n\n");
719 cgraph_function_flags_ready
= true;
723 /* Local function pass handling visibilities. This happens before LTO streaming
724 so in particular -fwhole-program should be ignored at this level. */
728 const pass_data pass_data_ipa_function_and_variable_visibility
=
730 SIMPLE_IPA_PASS
, /* type */
731 "visibility", /* name */
732 OPTGROUP_NONE
, /* optinfo_flags */
733 true, /* has_execute */
734 TV_CGRAPHOPT
, /* tv_id */
735 0, /* properties_required */
736 0, /* properties_provided */
737 0, /* properties_destroyed */
738 0, /* todo_flags_start */
739 ( TODO_remove_functions
| TODO_dump_symtab
), /* todo_flags_finish */
742 /* Bring functions local at LTO time with -fwhole-program. */
745 whole_program_function_and_variable_visibility (void)
747 function_and_variable_visibility (flag_whole_program
);
749 ipa_discover_readonly_nonaddressable_vars ();
757 const pass_data pass_data_ipa_whole_program_visibility
=
760 "whole-program", /* name */
761 OPTGROUP_NONE
, /* optinfo_flags */
762 true, /* has_execute */
763 TV_CGRAPHOPT
, /* tv_id */
764 0, /* properties_required */
765 0, /* properties_provided */
766 0, /* properties_destroyed */
767 0, /* todo_flags_start */
768 ( TODO_remove_functions
| TODO_dump_symtab
), /* todo_flags_finish */
771 class pass_ipa_whole_program_visibility
: public ipa_opt_pass_d
774 pass_ipa_whole_program_visibility (gcc::context
*ctxt
)
775 : ipa_opt_pass_d (pass_data_ipa_whole_program_visibility
, ctxt
,
776 NULL
, /* generate_summary */
777 NULL
, /* write_summary */
778 NULL
, /* read_summary */
779 NULL
, /* write_optimization_summary */
780 NULL
, /* read_optimization_summary */
781 NULL
, /* stmt_fixup */
782 0, /* function_transform_todo_flags_start */
783 NULL
, /* function_transform */
784 NULL
) /* variable_transform */
787 /* opt_pass methods: */
789 virtual bool gate (function
*)
791 /* Do not re-run on ltrans stage. */
794 virtual unsigned int execute (function
*)
796 return whole_program_function_and_variable_visibility ();
799 }; // class pass_ipa_whole_program_visibility
804 make_pass_ipa_whole_program_visibility (gcc::context
*ctxt
)
806 return new pass_ipa_whole_program_visibility (ctxt
);
809 class pass_ipa_function_and_variable_visibility
: public simple_ipa_opt_pass
812 pass_ipa_function_and_variable_visibility (gcc::context
*ctxt
)
813 : simple_ipa_opt_pass (pass_data_ipa_function_and_variable_visibility
,
817 /* opt_pass methods: */
818 virtual unsigned int execute (function
*)
820 return function_and_variable_visibility (flag_whole_program
&& !flag_lto
);
823 }; // class pass_ipa_function_and_variable_visibility
825 simple_ipa_opt_pass
*
826 make_pass_ipa_function_and_variable_visibility (gcc::context
*ctxt
)
828 return new pass_ipa_function_and_variable_visibility (ctxt
);