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
);
515 symtab_make_decl_local (next
->decl
);
516 next
->unique_name
= ((next
->resolution
== LDPR_PREVAILING_DEF_IRONLY
518 || next
->resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
)
519 && TREE_PUBLIC (next
->decl
));
521 /* cgraph_externally_visible_p has already checked all other nodes
522 in the group and they will all be made local. We need to
523 dissolve the group at once so that the predicate does not
525 symtab_dissolve_same_comdat_group_list (node
);
527 if (TREE_PUBLIC (node
->decl
))
528 node
->set_comdat_group (NULL
);
529 symtab_make_decl_local (node
->decl
);
532 if (node
->thunk
.thunk_p
533 && TREE_PUBLIC (node
->decl
))
535 struct cgraph_node
*decl_node
= node
;
537 decl_node
= cgraph_function_node (decl_node
->callees
->callee
, NULL
);
539 /* Thunks have the same visibility as function they are attached to.
540 Make sure the C++ front end set this up properly. */
541 if (DECL_ONE_ONLY (decl_node
->decl
))
543 gcc_checking_assert (DECL_COMDAT (node
->decl
)
544 == DECL_COMDAT (decl_node
->decl
));
545 gcc_checking_assert (symtab_in_same_comdat_p (node
, decl_node
));
546 gcc_checking_assert (node
->same_comdat_group
);
548 node
->forced_by_abi
= decl_node
->forced_by_abi
;
549 if (DECL_EXTERNAL (decl_node
->decl
))
550 DECL_EXTERNAL (node
->decl
) = 1;
553 update_visibility_by_resolution_info (node
);
555 FOR_EACH_DEFINED_FUNCTION (node
)
557 node
->local
.local
|= cgraph_local_node_p (node
);
559 /* If we know that function can not be overwritten by a different semantics
560 and moreover its section can not be discarded, replace all direct calls
561 by calls to an nonoverwritable alias. This make dynamic linking
562 cheaper and enable more optimization.
564 TODO: We can also update virtual tables. */
565 if (node
->callers
&& can_replace_by_local_alias (node
))
567 struct cgraph_node
*alias
= cgraph (symtab_nonoverwritable_alias (node
));
569 if (alias
&& alias
!= node
)
571 while (node
->callers
)
573 struct cgraph_edge
*e
= node
->callers
;
575 cgraph_redirect_edge_callee (e
, alias
);
576 if (gimple_has_body_p (e
->caller
->decl
))
578 push_cfun (DECL_STRUCT_FUNCTION (e
->caller
->decl
));
579 cgraph_redirect_edge_call_stmt_to_callee (e
);
586 FOR_EACH_VARIABLE (vnode
)
588 /* weak flag makes no sense on local variables. */
589 gcc_assert (!DECL_WEAK (vnode
->decl
)
591 || TREE_PUBLIC (vnode
->decl
)
592 || DECL_EXTERNAL (vnode
->decl
));
593 /* In several cases declarations can not be common:
595 - when declaration has initializer
597 - when it has specific section
598 - when it resides in non-generic address space.
599 - if declaration is local, it will get into .local common section
600 so common flag is not needed. Frontends still produce these in
601 certain cases, such as for:
603 static int a __attribute__ ((common))
605 Canonicalize things here and clear the redundant flag. */
606 if (DECL_COMMON (vnode
->decl
)
607 && (!(TREE_PUBLIC (vnode
->decl
)
608 || DECL_EXTERNAL (vnode
->decl
))
609 || (DECL_INITIAL (vnode
->decl
)
610 && DECL_INITIAL (vnode
->decl
) != error_mark_node
)
611 || DECL_WEAK (vnode
->decl
)
612 || DECL_SECTION_NAME (vnode
->decl
) != NULL
613 || ! (ADDR_SPACE_GENERIC_P
614 (TYPE_ADDR_SPACE (TREE_TYPE (vnode
->decl
))))))
615 DECL_COMMON (vnode
->decl
) = 0;
617 FOR_EACH_DEFINED_VARIABLE (vnode
)
619 if (!vnode
->definition
)
621 if (varpool_externally_visible_p (vnode
))
622 vnode
->externally_visible
= true;
625 vnode
->externally_visible
= false;
626 vnode
->forced_by_abi
= false;
628 if (!vnode
->externally_visible
631 gcc_assert (in_lto_p
|| whole_program
|| !TREE_PUBLIC (vnode
->decl
));
632 vnode
->unique_name
= ((vnode
->resolution
== LDPR_PREVAILING_DEF_IRONLY
633 || vnode
->resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
)
634 && TREE_PUBLIC (vnode
->decl
));
635 if (vnode
->same_comdat_group
&& TREE_PUBLIC (vnode
->decl
))
637 symtab_node
*next
= vnode
;
639 /* Set all members of comdat group local. */
640 if (vnode
->same_comdat_group
)
641 for (next
= vnode
->same_comdat_group
;
643 next
= next
->same_comdat_group
)
645 next
->set_comdat_group (NULL
);
646 symtab_make_decl_local (next
->decl
);
647 next
->unique_name
= ((next
->resolution
== LDPR_PREVAILING_DEF_IRONLY
649 || next
->resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
)
650 && TREE_PUBLIC (next
->decl
));
652 symtab_dissolve_same_comdat_group_list (vnode
);
654 if (TREE_PUBLIC (vnode
->decl
))
655 vnode
->set_comdat_group (NULL
);
656 symtab_make_decl_local (vnode
->decl
);
657 vnode
->resolution
= LDPR_PREVAILING_DEF_IRONLY
;
659 update_visibility_by_resolution_info (vnode
);
661 /* Update virutal tables to point to local aliases where possible. */
662 if (DECL_VIRTUAL_P (vnode
->decl
)
663 && !DECL_EXTERNAL (vnode
->decl
))
669 /* See if there is something to update. */
670 for (i
= 0; ipa_ref_list_referring_iterate (&vnode
->ref_list
,
672 if (ref
->use
== IPA_REF_ADDR
673 && can_replace_by_local_alias_in_vtable (ref
->referred
))
680 struct pointer_set_t
*visited_nodes
= pointer_set_create ();
681 walk_tree (&DECL_INITIAL (vnode
->decl
),
682 update_vtable_references
, NULL
, visited_nodes
);
683 pointer_set_destroy (visited_nodes
);
684 ipa_remove_all_references (&vnode
->ref_list
);
685 record_references_in_initializer (vnode
->decl
, false);
692 fprintf (dump_file
, "\nMarking local functions:");
693 FOR_EACH_DEFINED_FUNCTION (node
)
694 if (node
->local
.local
)
695 fprintf (dump_file
, " %s", node
->name ());
696 fprintf (dump_file
, "\n\n");
697 fprintf (dump_file
, "\nMarking externally visible functions:");
698 FOR_EACH_DEFINED_FUNCTION (node
)
699 if (node
->externally_visible
)
700 fprintf (dump_file
, " %s", node
->name ());
701 fprintf (dump_file
, "\n\n");
702 fprintf (dump_file
, "\nMarking externally visible variables:");
703 FOR_EACH_DEFINED_VARIABLE (vnode
)
704 if (vnode
->externally_visible
)
705 fprintf (dump_file
, " %s", vnode
->name ());
706 fprintf (dump_file
, "\n\n");
708 cgraph_function_flags_ready
= true;
712 /* Local function pass handling visibilities. This happens before LTO streaming
713 so in particular -fwhole-program should be ignored at this level. */
717 const pass_data pass_data_ipa_function_and_variable_visibility
=
719 SIMPLE_IPA_PASS
, /* type */
720 "visibility", /* name */
721 OPTGROUP_NONE
, /* optinfo_flags */
722 true, /* has_execute */
723 TV_CGRAPHOPT
, /* tv_id */
724 0, /* properties_required */
725 0, /* properties_provided */
726 0, /* properties_destroyed */
727 0, /* todo_flags_start */
728 ( TODO_remove_functions
| TODO_dump_symtab
), /* todo_flags_finish */
731 /* Bring functions local at LTO time with -fwhole-program. */
734 whole_program_function_and_variable_visibility (void)
736 function_and_variable_visibility (flag_whole_program
);
738 ipa_discover_readonly_nonaddressable_vars ();
746 const pass_data pass_data_ipa_whole_program_visibility
=
749 "whole-program", /* name */
750 OPTGROUP_NONE
, /* optinfo_flags */
751 true, /* has_execute */
752 TV_CGRAPHOPT
, /* tv_id */
753 0, /* properties_required */
754 0, /* properties_provided */
755 0, /* properties_destroyed */
756 0, /* todo_flags_start */
757 ( TODO_remove_functions
| TODO_dump_symtab
), /* todo_flags_finish */
760 class pass_ipa_whole_program_visibility
: public ipa_opt_pass_d
763 pass_ipa_whole_program_visibility (gcc::context
*ctxt
)
764 : ipa_opt_pass_d (pass_data_ipa_whole_program_visibility
, ctxt
,
765 NULL
, /* generate_summary */
766 NULL
, /* write_summary */
767 NULL
, /* read_summary */
768 NULL
, /* write_optimization_summary */
769 NULL
, /* read_optimization_summary */
770 NULL
, /* stmt_fixup */
771 0, /* function_transform_todo_flags_start */
772 NULL
, /* function_transform */
773 NULL
) /* variable_transform */
776 /* opt_pass methods: */
778 virtual bool gate (function
*)
780 /* Do not re-run on ltrans stage. */
783 virtual unsigned int execute (function
*)
785 return whole_program_function_and_variable_visibility ();
788 }; // class pass_ipa_whole_program_visibility
793 make_pass_ipa_whole_program_visibility (gcc::context
*ctxt
)
795 return new pass_ipa_whole_program_visibility (ctxt
);
798 class pass_ipa_function_and_variable_visibility
: public simple_ipa_opt_pass
801 pass_ipa_function_and_variable_visibility (gcc::context
*ctxt
)
802 : simple_ipa_opt_pass (pass_data_ipa_function_and_variable_visibility
,
806 /* opt_pass methods: */
807 virtual unsigned int execute (function
*)
809 return function_and_variable_visibility (flag_whole_program
&& !flag_lto
);
812 }; // class pass_ipa_function_and_variable_visibility
814 simple_ipa_opt_pass
*
815 make_pass_ipa_function_and_variable_visibility (gcc::context
*ctxt
)
817 return new pass_ipa_function_and_variable_visibility (ctxt
);