2 Copyright (C) 2012-2019 Free Software Foundation, Inc.
3 Contributed by Jan Hubicka
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 3, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
23 #include "coretypes.h"
31 #include "lto-streamer.h"
32 #include "print-tree.h"
34 #include "langhooks.h"
36 #include "ipa-utils.h"
38 #include "stringpool.h"
42 static const char *ipa_ref_use_name
[] = {"read","write","addr","alias"};
44 const char * const ld_plugin_symbol_resolution_names
[]=
49 "prevailing_def_ironly",
55 "prevailing_def_ironly_exp"
58 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at ALIAS
59 until we find an identifier that is not itself a transparent alias. */
62 ultimate_transparent_alias_target (tree alias
)
66 while (IDENTIFIER_TRANSPARENT_ALIAS (target
))
68 gcc_checking_assert (TREE_CHAIN (target
));
69 target
= TREE_CHAIN (target
);
71 gcc_checking_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target
)
72 && ! TREE_CHAIN (target
));
78 /* Hash asmnames ignoring the user specified marks. */
81 symbol_table::decl_assembler_name_hash (const_tree asmname
)
83 if (IDENTIFIER_POINTER (asmname
)[0] == '*')
85 const char *decl_str
= IDENTIFIER_POINTER (asmname
) + 1;
86 size_t ulp_len
= strlen (user_label_prefix
);
90 else if (strncmp (decl_str
, user_label_prefix
, ulp_len
) == 0)
93 return htab_hash_string (decl_str
);
96 return htab_hash_string (IDENTIFIER_POINTER (asmname
));
99 /* Return true if assembler names NAME1 and NAME2 leads to the same symbol
103 symbol_table::assembler_names_equal_p (const char *name1
, const char *name2
)
109 size_t ulp_len
= strlen (user_label_prefix
);
115 else if (strncmp (name1
, user_label_prefix
, ulp_len
) == 0)
122 size_t ulp_len
= strlen (user_label_prefix
);
128 else if (strncmp (name2
, user_label_prefix
, ulp_len
) == 0)
133 return !strcmp (name1
, name2
);
138 /* Compare ASMNAME with the DECL_ASSEMBLER_NAME of DECL. */
141 symbol_table::decl_assembler_name_equal (tree decl
, const_tree asmname
)
143 tree decl_asmname
= DECL_ASSEMBLER_NAME (decl
);
144 const char *decl_str
;
145 const char *asmname_str
;
147 if (decl_asmname
== asmname
)
150 decl_str
= IDENTIFIER_POINTER (decl_asmname
);
151 asmname_str
= IDENTIFIER_POINTER (asmname
);
152 return assembler_names_equal_p (decl_str
, asmname_str
);
156 /* Returns nonzero if P1 and P2 are equal. */
158 /* Insert NODE to assembler name hash. */
161 symbol_table::insert_to_assembler_name_hash (symtab_node
*node
,
164 if (is_a
<varpool_node
*> (node
) && DECL_HARD_REGISTER (node
->decl
))
166 gcc_checking_assert (!node
->previous_sharing_asm_name
167 && !node
->next_sharing_asm_name
);
168 if (assembler_name_hash
)
172 tree decl
= node
->decl
;
174 tree name
= DECL_ASSEMBLER_NAME (node
->decl
);
176 /* C++ FE can produce decls without associated assembler name and insert
177 them to symtab to hold section or TLS information. */
181 hashval_t hash
= decl_assembler_name_hash (name
);
182 aslot
= assembler_name_hash
->find_slot_with_hash (name
, hash
, INSERT
);
183 gcc_assert (*aslot
!= node
);
184 node
->next_sharing_asm_name
= (symtab_node
*)*aslot
;
186 (*aslot
)->previous_sharing_asm_name
= node
;
189 /* Update also possible inline clones sharing a decl. */
190 cnode
= dyn_cast
<cgraph_node
*> (node
);
191 if (cnode
&& cnode
->clones
&& with_clones
)
192 for (cnode
= cnode
->clones
; cnode
; cnode
= cnode
->next_sibling_clone
)
193 if (cnode
->decl
== decl
)
194 insert_to_assembler_name_hash (cnode
, true);
199 /* Remove NODE from assembler name hash. */
202 symbol_table::unlink_from_assembler_name_hash (symtab_node
*node
,
205 if (assembler_name_hash
)
208 tree decl
= node
->decl
;
210 if (node
->next_sharing_asm_name
)
211 node
->next_sharing_asm_name
->previous_sharing_asm_name
212 = node
->previous_sharing_asm_name
;
213 if (node
->previous_sharing_asm_name
)
215 node
->previous_sharing_asm_name
->next_sharing_asm_name
216 = node
->next_sharing_asm_name
;
220 tree name
= DECL_ASSEMBLER_NAME (node
->decl
);
226 hashval_t hash
= decl_assembler_name_hash (name
);
227 slot
= assembler_name_hash
->find_slot_with_hash (name
, hash
,
229 gcc_assert (*slot
== node
);
230 if (!node
->next_sharing_asm_name
)
231 assembler_name_hash
->clear_slot (slot
);
233 *slot
= node
->next_sharing_asm_name
;
235 node
->next_sharing_asm_name
= NULL
;
236 node
->previous_sharing_asm_name
= NULL
;
238 /* Update also possible inline clones sharing a decl. */
239 cnode
= dyn_cast
<cgraph_node
*> (node
);
240 if (cnode
&& cnode
->clones
&& with_clones
)
241 for (cnode
= cnode
->clones
; cnode
; cnode
= cnode
->next_sibling_clone
)
242 if (cnode
->decl
== decl
)
243 unlink_from_assembler_name_hash (cnode
, true);
247 /* Arrange node to be first in its entry of assembler_name_hash. */
250 symbol_table::symtab_prevail_in_asm_name_hash (symtab_node
*node
)
252 unlink_from_assembler_name_hash (node
, false);
253 insert_to_assembler_name_hash (node
, false);
256 /* Initalize asm name hash unless. */
259 symbol_table::symtab_initialize_asm_name_hash (void)
262 if (!assembler_name_hash
)
264 assembler_name_hash
= hash_table
<asmname_hasher
>::create_ggc (10);
265 FOR_EACH_SYMBOL (node
)
266 insert_to_assembler_name_hash (node
, false);
270 /* Set the DECL_ASSEMBLER_NAME and update symtab hashtables. */
273 symbol_table::change_decl_assembler_name (tree decl
, tree name
)
275 symtab_node
*node
= NULL
;
277 /* We can have user ASM names on things, like global register variables, that
278 are not in the symbol table. */
279 if ((VAR_P (decl
) && (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)))
280 || TREE_CODE (decl
) == FUNCTION_DECL
)
281 node
= symtab_node::get (decl
);
282 if (!DECL_ASSEMBLER_NAME_SET_P (decl
))
284 SET_DECL_ASSEMBLER_NAME (decl
, name
);
286 insert_to_assembler_name_hash (node
, true);
290 if (name
== DECL_ASSEMBLER_NAME (decl
))
293 tree alias
= (IDENTIFIER_TRANSPARENT_ALIAS (DECL_ASSEMBLER_NAME (decl
))
294 ? TREE_CHAIN (DECL_ASSEMBLER_NAME (decl
))
297 unlink_from_assembler_name_hash (node
, true);
299 const char *old_name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
300 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
301 && DECL_RTL_SET_P (decl
))
302 warning (0, "%qD renamed after being referenced in assembly", decl
);
304 SET_DECL_ASSEMBLER_NAME (decl
, name
);
307 IDENTIFIER_TRANSPARENT_ALIAS (name
) = 1;
308 TREE_CHAIN (name
) = alias
;
310 /* If we change assembler name, also all transparent aliases must
311 be updated. There are three kinds - those having same assembler name,
312 those being renamed in varasm.c and weakref being renamed by the
316 insert_to_assembler_name_hash (node
, true);
318 for (unsigned i
= 0; node
->iterate_direct_aliases (i
, ref
); i
++)
320 struct symtab_node
*alias
= ref
->referring
;
321 if (alias
->transparent_alias
&& !alias
->weakref
322 && symbol_table::assembler_names_equal_p
323 (old_name
, IDENTIFIER_POINTER (
324 DECL_ASSEMBLER_NAME (alias
->decl
))))
325 change_decl_assembler_name (alias
->decl
, name
);
326 else if (alias
->transparent_alias
327 && IDENTIFIER_TRANSPARENT_ALIAS (alias
->decl
))
329 gcc_assert (TREE_CHAIN (DECL_ASSEMBLER_NAME (alias
->decl
))
330 && IDENTIFIER_TRANSPARENT_ALIAS
331 (DECL_ASSEMBLER_NAME (alias
->decl
)));
333 TREE_CHAIN (DECL_ASSEMBLER_NAME (alias
->decl
)) =
334 ultimate_transparent_alias_target
335 (DECL_ASSEMBLER_NAME (node
->decl
));
337 #ifdef ASM_OUTPUT_WEAKREF
338 else gcc_assert (!alias
->transparent_alias
|| alias
->weakref
);
340 else gcc_assert (!alias
->transparent_alias
);
343 gcc_assert (!node
->transparent_alias
|| !node
->definition
345 || TREE_CHAIN (DECL_ASSEMBLER_NAME (decl
))
346 || symbol_table::assembler_names_equal_p
347 (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
350 (node
->get_alias_target ()->decl
))));
355 /* Hash sections by their names. */
358 section_name_hasher::hash (section_hash_entry
*n
)
360 return htab_hash_string (n
->name
);
363 /* Return true if section P1 name equals to P2. */
366 section_name_hasher::equal (section_hash_entry
*n1
, const char *name
)
368 return n1
->name
== name
|| !strcmp (n1
->name
, name
);
371 /* Add node into symbol table. This function is not used directly, but via
372 cgraph/varpool node creation routines. */
375 symtab_node::register_symbol (void)
377 symtab
->register_symbol (this);
379 if (!decl
->decl_with_vis
.symtab_node
)
380 decl
->decl_with_vis
.symtab_node
= this;
384 /* Be sure to do this last; C++ FE might create new nodes via
385 DECL_ASSEMBLER_NAME langhook! */
386 symtab
->insert_to_assembler_name_hash (this, false);
389 /* Remove NODE from same comdat group. */
392 symtab_node::remove_from_same_comdat_group (void)
394 if (same_comdat_group
)
397 for (prev
= same_comdat_group
;
398 prev
->same_comdat_group
!= this;
399 prev
= prev
->same_comdat_group
)
401 if (same_comdat_group
== prev
)
402 prev
->same_comdat_group
= NULL
;
404 prev
->same_comdat_group
= same_comdat_group
;
405 same_comdat_group
= NULL
;
406 set_comdat_group (NULL
);
410 /* Remove node from symbol table. This function is not used directly, but via
411 cgraph/varpool node removal routines. */
414 symtab_node::unregister (void)
416 remove_all_references ();
417 remove_all_referring ();
419 /* Remove reference to section. */
420 set_section_for_node (NULL
);
422 remove_from_same_comdat_group ();
424 symtab
->unregister (this);
426 /* During LTO symtab merging we temporarily corrupt decl to symtab node
428 gcc_assert (decl
->decl_with_vis
.symtab_node
|| in_lto_p
);
429 if (decl
->decl_with_vis
.symtab_node
== this)
431 symtab_node
*replacement_node
= NULL
;
432 if (cgraph_node
*cnode
= dyn_cast
<cgraph_node
*> (this))
433 replacement_node
= cnode
->find_replacement ();
434 decl
->decl_with_vis
.symtab_node
= replacement_node
;
436 if (!is_a
<varpool_node
*> (this) || !DECL_HARD_REGISTER (decl
))
437 symtab
->unlink_from_assembler_name_hash (this, false);
438 if (in_init_priority_hash
)
439 symtab
->init_priority_hash
->remove (this);
443 /* Remove symbol from symbol table. */
446 symtab_node::remove (void)
448 if (cgraph_node
*cnode
= dyn_cast
<cgraph_node
*> (this))
450 else if (varpool_node
*vnode
= dyn_cast
<varpool_node
*> (this))
454 /* Add NEW_ to the same comdat group that OLD is in. */
457 symtab_node::add_to_same_comdat_group (symtab_node
*old_node
)
459 gcc_assert (old_node
->get_comdat_group ());
460 gcc_assert (!same_comdat_group
);
461 gcc_assert (this != old_node
);
463 set_comdat_group (old_node
->get_comdat_group ());
464 same_comdat_group
= old_node
;
465 if (!old_node
->same_comdat_group
)
466 old_node
->same_comdat_group
= this;
470 for (n
= old_node
->same_comdat_group
;
471 n
->same_comdat_group
!= old_node
;
472 n
= n
->same_comdat_group
)
474 n
->same_comdat_group
= this;
478 /* Dissolve the same_comdat_group list in which NODE resides. */
481 symtab_node::dissolve_same_comdat_group_list (void)
483 symtab_node
*n
= this;
486 if (!same_comdat_group
)
490 next
= n
->same_comdat_group
;
491 n
->same_comdat_group
= NULL
;
492 /* Clear comdat_group for comdat locals, since
493 make_decl_local doesn't. */
494 if (!TREE_PUBLIC (n
->decl
))
495 n
->set_comdat_group (NULL
);
501 /* Return printable assembler name of NODE.
502 This function is used only for debugging. When assembler name
503 is unknown go with identifier name. */
506 symtab_node::asm_name () const
508 if (!DECL_ASSEMBLER_NAME_SET_P (decl
))
510 return IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
513 /* Return printable identifier name. */
516 symtab_node::name () const
518 if (!DECL_NAME (decl
))
520 if (DECL_ASSEMBLER_NAME_SET_P (decl
))
525 return lang_hooks
.decl_printable_name (decl
, 2);
529 symtab_node::get_dump_name (bool asm_name_p
) const
532 const char *fname
= asm_name_p
? asm_name () : name ();
533 unsigned l
= strlen (fname
);
535 char *s
= (char *)ggc_internal_cleared_alloc (l
+ EXTRA
);
536 snprintf (s
, l
+ EXTRA
, "%s/%d", fname
, order
);
542 symtab_node::dump_name () const
544 return get_dump_name (false);
548 symtab_node::dump_asm_name () const
550 return get_dump_name (true);
553 /* Return ipa reference from this symtab_node to
554 REFERED_NODE or REFERED_VARPOOL_NODE. USE_TYPE specify type
558 symtab_node::create_reference (symtab_node
*referred_node
,
559 enum ipa_ref_use use_type
)
561 return create_reference (referred_node
, use_type
, NULL
);
565 /* Return ipa reference from this symtab_node to
566 REFERED_NODE or REFERED_VARPOOL_NODE. USE_TYPE specify type
567 of the use and STMT the statement (if it exists). */
570 symtab_node::create_reference (symtab_node
*referred_node
,
571 enum ipa_ref_use use_type
, gimple
*stmt
)
573 ipa_ref
*ref
= NULL
, *ref2
= NULL
;
574 ipa_ref_list
*list
, *list2
;
575 ipa_ref_t
*old_references
;
577 gcc_checking_assert (!stmt
|| is_a
<cgraph_node
*> (this));
578 gcc_checking_assert (use_type
!= IPA_REF_ALIAS
|| !stmt
);
581 old_references
= vec_safe_address (list
->references
);
582 vec_safe_grow (list
->references
, vec_safe_length (list
->references
) + 1);
583 ref
= &list
->references
->last ();
585 list2
= &referred_node
->ref_list
;
587 /* IPA_REF_ALIAS is always inserted at the beginning of the list. */
588 if(use_type
== IPA_REF_ALIAS
)
590 list2
->referring
.safe_insert (0, ref
);
591 ref
->referred_index
= 0;
593 for (unsigned int i
= 1; i
< list2
->referring
.length (); i
++)
594 list2
->referring
[i
]->referred_index
= i
;
598 list2
->referring
.safe_push (ref
);
599 ref
->referred_index
= list2
->referring
.length () - 1;
602 ref
->referring
= this;
603 ref
->referred
= referred_node
;
605 ref
->lto_stmt_uid
= 0;
607 ref
->speculative
= 0;
609 /* If vector was moved in memory, update pointers. */
610 if (old_references
!= list
->references
->address ())
613 for (i
= 0; iterate_reference(i
, ref2
); i
++)
614 ref2
->referred_ref_list ()->referring
[ref2
->referred_index
] = ref2
;
620 symtab_node::maybe_create_reference (tree val
, gimple
*stmt
)
623 ipa_ref_use use_type
;
625 switch (TREE_CODE (val
))
628 use_type
= IPA_REF_LOAD
;
631 use_type
= IPA_REF_ADDR
;
634 gcc_assert (!handled_component_p (val
));
638 val
= get_base_var (val
);
639 if (val
&& VAR_OR_FUNCTION_DECL_P (val
))
641 symtab_node
*referred
= symtab_node::get (val
);
642 gcc_checking_assert (referred
);
643 return create_reference (referred
, use_type
, stmt
);
648 /* Clone all references from symtab NODE to this symtab_node. */
651 symtab_node::clone_references (symtab_node
*node
)
653 ipa_ref
*ref
= NULL
, *ref2
= NULL
;
655 for (i
= 0; node
->iterate_reference (i
, ref
); i
++)
657 bool speculative
= ref
->speculative
;
658 unsigned int stmt_uid
= ref
->lto_stmt_uid
;
660 ref2
= create_reference (ref
->referred
, ref
->use
, ref
->stmt
);
661 ref2
->speculative
= speculative
;
662 ref2
->lto_stmt_uid
= stmt_uid
;
666 /* Clone all referring from symtab NODE to this symtab_node. */
669 symtab_node::clone_referring (symtab_node
*node
)
671 ipa_ref
*ref
= NULL
, *ref2
= NULL
;
673 for (i
= 0; node
->iterate_referring(i
, ref
); i
++)
675 bool speculative
= ref
->speculative
;
676 unsigned int stmt_uid
= ref
->lto_stmt_uid
;
678 ref2
= ref
->referring
->create_reference (this, ref
->use
, ref
->stmt
);
679 ref2
->speculative
= speculative
;
680 ref2
->lto_stmt_uid
= stmt_uid
;
684 /* Clone reference REF to this symtab_node and set its stmt to STMT. */
687 symtab_node::clone_reference (ipa_ref
*ref
, gimple
*stmt
)
689 bool speculative
= ref
->speculative
;
690 unsigned int stmt_uid
= ref
->lto_stmt_uid
;
693 ref2
= create_reference (ref
->referred
, ref
->use
, stmt
);
694 ref2
->speculative
= speculative
;
695 ref2
->lto_stmt_uid
= stmt_uid
;
699 /* Find the structure describing a reference to REFERRED_NODE
700 and associated with statement STMT. */
703 symtab_node::find_reference (symtab_node
*referred_node
,
704 gimple
*stmt
, unsigned int lto_stmt_uid
)
709 for (i
= 0; iterate_reference (i
, r
); i
++)
710 if (r
->referred
== referred_node
712 && ((stmt
&& r
->stmt
== stmt
)
713 || (lto_stmt_uid
&& r
->lto_stmt_uid
== lto_stmt_uid
)
714 || (!stmt
&& !lto_stmt_uid
&& !r
->stmt
&& !r
->lto_stmt_uid
)))
719 /* Remove all references that are associated with statement STMT. */
722 symtab_node::remove_stmt_references (gimple
*stmt
)
727 while (iterate_reference (i
, r
))
729 r
->remove_reference ();
734 /* Remove all stmt references in non-speculative references.
735 Those are not maintained during inlining & clonning.
736 The exception are speculative references that are updated along
737 with callgraph edges associated with them. */
740 symtab_node::clear_stmts_in_references (void)
745 for (i
= 0; iterate_reference (i
, r
); i
++)
753 /* Remove all references in ref list. */
756 symtab_node::remove_all_references (void)
758 while (vec_safe_length (ref_list
.references
))
759 ref_list
.references
->last ().remove_reference ();
760 vec_free (ref_list
.references
);
763 /* Remove all referring items in ref list. */
766 symtab_node::remove_all_referring (void)
768 while (ref_list
.referring
.length ())
769 ref_list
.referring
.last ()->remove_reference ();
770 ref_list
.referring
.release ();
773 /* Dump references in ref list to FILE. */
776 symtab_node::dump_references (FILE *file
)
780 for (i
= 0; iterate_reference (i
, ref
); i
++)
782 fprintf (file
, "%s (%s)",
783 ref
->referred
->dump_asm_name (),
784 ipa_ref_use_name
[ref
->use
]);
785 if (ref
->speculative
)
786 fprintf (file
, " (speculative)");
788 fprintf (file
, "\n");
791 /* Dump referring in list to FILE. */
794 symtab_node::dump_referring (FILE *file
)
798 for (i
= 0; iterate_referring(i
, ref
); i
++)
800 fprintf (file
, "%s (%s)",
801 ref
->referring
->dump_asm_name (),
802 ipa_ref_use_name
[ref
->use
]);
803 if (ref
->speculative
)
804 fprintf (file
, " (speculative)");
806 fprintf (file
, "\n");
809 static const char * const symtab_type_names
[] = {"symbol", "function", "variable"};
811 /* Dump base fields of symtab nodes to F. Not to be used directly. */
814 symtab_node::dump_base (FILE *f
)
816 static const char * const visibility_types
[] = {
817 "default", "protected", "hidden", "internal"
820 fprintf (f
, "%s (%s)", dump_asm_name (), name ());
821 dump_addr (f
, " @", (void *)this);
822 fprintf (f
, "\n Type: %s", symtab_type_names
[type
]);
825 fprintf (f
, " definition");
827 fprintf (f
, " analyzed");
829 fprintf (f
, " alias");
830 if (transparent_alias
)
831 fprintf (f
, " transparent_alias");
833 fprintf (f
, " weakref");
834 if (cpp_implicit_alias
)
835 fprintf (f
, " cpp_implicit_alias");
837 fprintf (f
, " target:%s",
838 DECL_P (alias_target
)
839 ? IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME
841 : IDENTIFIER_POINTER (alias_target
));
843 fprintf (f
, "\n Body removed by symtab_remove_unreachable_nodes");
844 fprintf (f
, "\n Visibility:");
845 if (in_other_partition
)
846 fprintf (f
, " in_other_partition");
847 if (used_from_other_partition
)
848 fprintf (f
, " used_from_other_partition");
850 fprintf (f
, " force_output");
852 fprintf (f
, " forced_by_abi");
853 if (externally_visible
)
854 fprintf (f
, " externally_visible");
856 fprintf (f
, " no_reorder");
857 if (resolution
!= LDPR_UNKNOWN
)
859 ld_plugin_symbol_resolution_names
[(int)resolution
]);
860 if (TREE_ASM_WRITTEN (decl
))
861 fprintf (f
, " asm_written");
862 if (DECL_EXTERNAL (decl
))
863 fprintf (f
, " external");
864 if (TREE_PUBLIC (decl
))
865 fprintf (f
, " public");
866 if (DECL_COMMON (decl
))
867 fprintf (f
, " common");
868 if (DECL_WEAK (decl
))
869 fprintf (f
, " weak");
870 if (DECL_DLLIMPORT_P (decl
))
871 fprintf (f
, " dll_import");
872 if (DECL_COMDAT (decl
))
873 fprintf (f
, " comdat");
874 if (get_comdat_group ())
875 fprintf (f
, " comdat_group:%s",
876 IDENTIFIER_POINTER (get_comdat_group_id ()));
877 if (DECL_ONE_ONLY (decl
))
878 fprintf (f
, " one_only");
880 fprintf (f
, " section:%s",
882 if (implicit_section
)
883 fprintf (f
," (implicit_section)");
884 if (DECL_VISIBILITY_SPECIFIED (decl
))
885 fprintf (f
, " visibility_specified");
886 if (DECL_VISIBILITY (decl
))
887 fprintf (f
, " visibility:%s",
888 visibility_types
[DECL_VISIBILITY (decl
)]);
889 if (DECL_VIRTUAL_P (decl
))
890 fprintf (f
, " virtual");
891 if (DECL_ARTIFICIAL (decl
))
892 fprintf (f
, " artificial");
893 if (TREE_CODE (decl
) == FUNCTION_DECL
)
895 if (DECL_STATIC_CONSTRUCTOR (decl
))
896 fprintf (f
, " constructor");
897 if (DECL_STATIC_DESTRUCTOR (decl
))
898 fprintf (f
, " destructor");
902 if (same_comdat_group
)
903 fprintf (f
, " Same comdat group as: %s\n",
904 same_comdat_group
->dump_asm_name ());
905 if (next_sharing_asm_name
)
906 fprintf (f
, " next sharing asm name: %i\n",
907 next_sharing_asm_name
->order
);
908 if (previous_sharing_asm_name
)
909 fprintf (f
, " previous sharing asm name: %i\n",
910 previous_sharing_asm_name
->order
);
913 fprintf (f
, " Address is taken.\n");
916 fprintf (f
, " Aux:");
917 dump_addr (f
, " @", (void *)aux
);
921 fprintf (f
, " References: ");
923 fprintf (f
, " Referring: ");
926 fprintf (f
, " Read from file: %s\n",
927 lto_file_data
->file_name
);
930 /* Dump symtab node to F. */
933 symtab_node::dump (FILE *f
)
935 if (cgraph_node
*cnode
= dyn_cast
<cgraph_node
*> (this))
937 else if (varpool_node
*vnode
= dyn_cast
<varpool_node
*> (this))
942 symbol_table::dump (FILE *f
)
945 fprintf (f
, "Symbol table:\n\n");
946 FOR_EACH_SYMBOL (node
)
951 symbol_table::debug (void)
956 /* Return the cgraph node that has ASMNAME for its DECL_ASSEMBLER_NAME.
957 Return NULL if there's no such node. */
960 symtab_node::get_for_asmname (const_tree asmname
)
964 symtab
->symtab_initialize_asm_name_hash ();
965 hashval_t hash
= symtab
->decl_assembler_name_hash (asmname
);
967 = symtab
->assembler_name_hash
->find_slot_with_hash (asmname
, hash
,
978 /* Dump symtab node NODE to stderr. */
981 symtab_node::debug (void)
986 /* Verify common part of symtab nodes. */
989 symtab_node::verify_base (void)
991 bool error_found
= false;
992 symtab_node
*hashed_node
;
994 if (is_a
<cgraph_node
*> (this))
996 if (TREE_CODE (decl
) != FUNCTION_DECL
)
998 error ("function symbol is not function");
1001 else if ((lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
))
1003 != dyn_cast
<cgraph_node
*> (this)->ifunc_resolver
)
1005 error ("inconsistent %<ifunc%> attribute");
1009 else if (is_a
<varpool_node
*> (this))
1013 error ("variable symbol is not variable");
1019 error ("node has unknown type");
1023 if (symtab
->state
!= LTO_STREAMING
)
1025 hashed_node
= symtab_node::get (decl
);
1028 error ("node not found node->decl->decl_with_vis.symtab_node");
1031 if (hashed_node
!= this
1032 && (!is_a
<cgraph_node
*> (this)
1033 || !dyn_cast
<cgraph_node
*> (this)->clone_of
1034 || dyn_cast
<cgraph_node
*> (this)->clone_of
->decl
!= decl
))
1036 error ("node differs from node->decl->decl_with_vis.symtab_node");
1040 if (symtab
->assembler_name_hash
)
1042 hashed_node
= symtab_node::get_for_asmname (DECL_ASSEMBLER_NAME (decl
));
1045 if (hashed_node
->previous_sharing_asm_name
)
1047 error ("assembler name hash list corrupted");
1050 else if (previous_sharing_asm_name
== NULL
)
1052 if (hashed_node
!= this)
1054 error ("assembler name hash list corrupted");
1058 else if (!(is_a
<varpool_node
*> (this) && DECL_HARD_REGISTER (decl
)))
1060 if (!asmname_hasher::equal (previous_sharing_asm_name
,
1061 DECL_ASSEMBLER_NAME (decl
)))
1063 error ("node not found in symtab assembler name hash");
1069 if (previous_sharing_asm_name
1070 && previous_sharing_asm_name
->next_sharing_asm_name
!= this)
1072 error ("double linked list of assembler names corrupted");
1075 if (body_removed
&& definition
)
1077 error ("node has body_removed but is definition");
1080 if (analyzed
&& !definition
)
1082 error ("node is analyzed but it is not a definition");
1085 if (cpp_implicit_alias
&& !alias
)
1087 error ("node is alias but not implicit alias");
1090 if (alias
&& !definition
&& !weakref
)
1092 error ("node is alias but not definition");
1095 if (weakref
&& !transparent_alias
)
1097 error ("node is weakref but not an transparent_alias");
1100 if (transparent_alias
&& !alias
)
1102 error ("node is transparent_alias but not an alias");
1105 if (same_comdat_group
)
1107 symtab_node
*n
= same_comdat_group
;
1109 if (!n
->get_comdat_group ())
1111 error ("node is in same_comdat_group list but has no comdat_group");
1114 if (n
->get_comdat_group () != get_comdat_group ())
1116 error ("same_comdat_group list across different groups");
1119 if (n
->type
!= type
)
1121 error ("mixing different types of symbol in same comdat groups is not supported");
1126 error ("node is alone in a comdat group");
1131 if (!n
->same_comdat_group
)
1133 error ("same_comdat_group is not a circular list");
1137 n
= n
->same_comdat_group
;
1140 if (comdat_local_p ())
1142 ipa_ref
*ref
= NULL
;
1144 for (int i
= 0; iterate_referring (i
, ref
); ++i
)
1146 if (!in_same_comdat_group_p (ref
->referring
))
1148 error ("comdat-local symbol referred to by %s outside its "
1150 identifier_to_locale (ref
->referring
->name()));
1156 if (implicit_section
&& !get_section ())
1158 error ("implicit_section flag is set but section isn%'t");
1161 if (get_section () && get_comdat_group ()
1162 && !implicit_section
1163 && !lookup_attribute ("section", DECL_ATTRIBUTES (decl
)))
1165 error ("Both section and comdat group is set");
1168 /* TODO: Add string table for sections, so we do not keep holding duplicated
1170 if (alias
&& definition
1171 && get_section () != get_alias_target ()->get_section ()
1173 || !get_alias_target ()->get_section ()
1174 || strcmp (get_section(),
1175 get_alias_target ()->get_section ())))
1177 error ("Alias and target%'s section differs");
1178 get_alias_target ()->dump (stderr
);
1181 if (alias
&& definition
1182 && get_comdat_group () != get_alias_target ()->get_comdat_group ())
1184 error ("Alias and target%'s comdat groups differs");
1185 get_alias_target ()->dump (stderr
);
1188 if (transparent_alias
&& definition
&& !weakref
)
1190 symtab_node
*to
= get_alias_target ();
1192 = IDENTIFIER_POINTER (
1193 ultimate_transparent_alias_target (DECL_ASSEMBLER_NAME (decl
)));
1195 = IDENTIFIER_POINTER (
1196 ultimate_transparent_alias_target (DECL_ASSEMBLER_NAME (to
->decl
)));
1197 if (!symbol_table::assembler_names_equal_p (name1
, name2
))
1199 error ("Transparent alias and target%'s assembler names differs");
1200 get_alias_target ()->dump (stderr
);
1204 if (transparent_alias
&& definition
1205 && get_alias_target()->transparent_alias
&& get_alias_target()->analyzed
)
1207 error ("Chained transparent aliases");
1208 get_alias_target ()->dump (stderr
);
1215 /* Verify consistency of NODE. */
1218 symtab_node::verify (void)
1223 timevar_push (TV_CGRAPH_VERIFY
);
1224 if (cgraph_node
*node
= dyn_cast
<cgraph_node
*> (this))
1225 node
->verify_node ();
1230 internal_error ("symtab_node::verify failed");
1232 timevar_pop (TV_CGRAPH_VERIFY
);
1235 /* Verify symbol table for internal consistency. */
1238 symtab_node::verify_symtab_nodes (void)
1241 hash_map
<tree
, symtab_node
*> comdat_head_map (251);
1243 FOR_EACH_SYMBOL (node
)
1246 if (node
->get_comdat_group ())
1248 symtab_node
**entry
, *s
;
1251 entry
= &comdat_head_map
.get_or_insert (node
->get_comdat_group (),
1255 else if (!DECL_EXTERNAL (node
->decl
))
1257 for (s
= (*entry
)->same_comdat_group
;
1258 s
!= NULL
&& s
!= node
&& s
!= *entry
;
1259 s
= s
->same_comdat_group
)
1261 if (!s
|| s
== *entry
)
1263 error ("Two symbols with same comdat_group are not linked by "
1264 "the same_comdat_group list.");
1267 internal_error ("symtab_node::verify failed");
1274 /* Make DECL local. FIXME: We shouldn't need to mess with rtl this early,
1275 but other code such as notice_global_symbol generates rtl. */
1278 symtab_node::make_decl_local (void)
1285 IDENTIFIER_TRANSPARENT_ALIAS (DECL_ASSEMBLER_NAME (decl
)) = 0;
1286 TREE_CHAIN (DECL_ASSEMBLER_NAME (decl
)) = NULL_TREE
;
1287 symtab
->change_decl_assembler_name
1288 (decl
, DECL_ASSEMBLER_NAME (get_alias_target ()->decl
));
1289 DECL_ATTRIBUTES (decl
) = remove_attribute ("weakref",
1290 DECL_ATTRIBUTES (decl
));
1292 /* Avoid clearing comdat_groups on comdat-local decls. */
1293 else if (TREE_PUBLIC (decl
) == 0)
1296 /* Localizing a symbol also make all its transparent aliases local. */
1298 for (unsigned i
= 0; iterate_direct_aliases (i
, ref
); i
++)
1300 struct symtab_node
*alias
= ref
->referring
;
1301 if (alias
->transparent_alias
)
1302 alias
->make_decl_local ();
1307 DECL_COMMON (decl
) = 0;
1308 /* ADDRESSABLE flag is not defined for public symbols. */
1309 TREE_ADDRESSABLE (decl
) = 1;
1310 TREE_STATIC (decl
) = 1;
1313 gcc_assert (TREE_CODE (decl
) == FUNCTION_DECL
);
1315 DECL_COMDAT (decl
) = 0;
1316 DECL_WEAK (decl
) = 0;
1317 DECL_EXTERNAL (decl
) = 0;
1318 DECL_VISIBILITY_SPECIFIED (decl
) = 0;
1319 DECL_VISIBILITY (decl
) = VISIBILITY_DEFAULT
;
1320 TREE_PUBLIC (decl
) = 0;
1321 DECL_DLLIMPORT_P (decl
) = 0;
1322 if (!DECL_RTL_SET_P (decl
))
1325 /* Update rtl flags. */
1326 make_decl_rtl (decl
);
1328 rtl
= DECL_RTL (decl
);
1332 symbol
= XEXP (rtl
, 0);
1333 if (GET_CODE (symbol
) != SYMBOL_REF
)
1336 SYMBOL_REF_WEAK (symbol
) = DECL_WEAK (decl
);
1339 /* Copy visibility from N.
1340 This is useful when THIS becomes a transparent alias of N. */
1343 symtab_node::copy_visibility_from (symtab_node
*n
)
1345 gcc_checking_assert (n
->weakref
== weakref
);
1348 for (unsigned i
= 0; iterate_direct_aliases (i
, ref
); i
++)
1350 struct symtab_node
*alias
= ref
->referring
;
1351 if (alias
->transparent_alias
)
1352 alias
->copy_visibility_from (n
);
1357 DECL_COMMON (decl
) = DECL_COMMON (n
->decl
);
1358 /* ADDRESSABLE flag is not defined for public symbols. */
1359 if (TREE_PUBLIC (decl
) && !TREE_PUBLIC (n
->decl
))
1360 TREE_ADDRESSABLE (decl
) = 1;
1361 TREE_STATIC (decl
) = TREE_STATIC (n
->decl
);
1363 else gcc_assert (TREE_CODE (decl
) == FUNCTION_DECL
);
1365 DECL_COMDAT (decl
) = DECL_COMDAT (n
->decl
);
1366 DECL_WEAK (decl
) = DECL_WEAK (n
->decl
);
1367 DECL_EXTERNAL (decl
) = DECL_EXTERNAL (n
->decl
);
1368 DECL_VISIBILITY_SPECIFIED (decl
) = DECL_VISIBILITY_SPECIFIED (n
->decl
);
1369 DECL_VISIBILITY (decl
) = DECL_VISIBILITY (n
->decl
);
1370 TREE_PUBLIC (decl
) = TREE_PUBLIC (n
->decl
);
1371 DECL_DLLIMPORT_P (decl
) = DECL_DLLIMPORT_P (n
->decl
);
1372 resolution
= n
->resolution
;
1373 set_comdat_group (n
->get_comdat_group ());
1374 call_for_symbol_and_aliases (symtab_node::set_section
,
1375 const_cast<char *>(n
->get_section ()), true);
1376 externally_visible
= n
->externally_visible
;
1377 if (!DECL_RTL_SET_P (decl
))
1380 /* Update rtl flags. */
1381 make_decl_rtl (decl
);
1383 rtx rtl
= DECL_RTL (decl
);
1387 rtx symbol
= XEXP (rtl
, 0);
1388 if (GET_CODE (symbol
) != SYMBOL_REF
)
1391 SYMBOL_REF_WEAK (symbol
) = DECL_WEAK (decl
);
1394 /* Walk the alias chain to return the symbol NODE is alias of.
1395 If NODE is not an alias, return NODE.
1396 Assumes NODE is known to be alias. */
1399 symtab_node::ultimate_alias_target_1 (enum availability
*availability
,
1402 bool transparent_p
= false;
1404 /* To determine visibility of the target, we follow ELF semantic of aliases.
1405 Here alias is an alternative assembler name of a given definition. Its
1406 availability prevails the availability of its target (i.e. static alias of
1407 weak definition is available.
1409 Transaparent alias is just alternative anme of a given symbol used within
1410 one compilation unit and is translated prior hitting the object file. It
1411 inherits the visibility of its target.
1412 Weakref is a different animal (and noweak definition is weak).
1414 If we ever get into supporting targets with different semantics, a target
1415 hook will be needed here. */
1419 transparent_p
= transparent_alias
;
1421 *availability
= get_availability (ref
);
1423 *availability
= AVAIL_NOT_AVAILABLE
;
1426 symtab_node
*node
= this;
1429 if (node
->alias
&& node
->analyzed
)
1430 node
= node
->get_alias_target ();
1433 if (!availability
|| (!transparent_p
&& node
->analyzed
))
1435 else if (node
->analyzed
&& !node
->transparent_alias
)
1436 *availability
= node
->get_availability (ref
);
1438 *availability
= AVAIL_NOT_AVAILABLE
;
1441 if (node
&& availability
&& transparent_p
1442 && node
->transparent_alias
)
1444 *availability
= node
->get_availability (ref
);
1445 transparent_p
= false;
1449 *availability
= AVAIL_NOT_AVAILABLE
;
1453 /* C++ FE sometimes change linkage flags after producing same body aliases.
1455 FIXME: C++ produce implicit aliases for virtual functions and vtables that
1456 are obviously equivalent. The way it is doing so is however somewhat
1457 kludgy and interferes with the visibility code. As a result we need to
1458 copy the visibility from the target to get things right. */
1461 symtab_node::fixup_same_cpp_alias_visibility (symtab_node
*target
)
1463 if (is_a
<cgraph_node
*> (this))
1465 DECL_DECLARED_INLINE_P (decl
)
1466 = DECL_DECLARED_INLINE_P (target
->decl
);
1467 DECL_DISREGARD_INLINE_LIMITS (decl
)
1468 = DECL_DISREGARD_INLINE_LIMITS (target
->decl
);
1470 /* FIXME: It is not really clear why those flags should not be copied for
1474 DECL_WEAK (decl
) = DECL_WEAK (target
->decl
);
1475 DECL_EXTERNAL (decl
) = DECL_EXTERNAL (target
->decl
);
1476 DECL_VISIBILITY (decl
) = DECL_VISIBILITY (target
->decl
);
1478 if (TREE_PUBLIC (decl
))
1482 DECL_EXTERNAL (decl
) = DECL_EXTERNAL (target
->decl
);
1483 DECL_COMDAT (decl
) = DECL_COMDAT (target
->decl
);
1484 group
= target
->get_comdat_group ();
1485 set_comdat_group (group
);
1486 if (group
&& !same_comdat_group
)
1487 add_to_same_comdat_group (target
);
1489 externally_visible
= target
->externally_visible
;
1492 /* Set section, do not recurse into aliases.
1493 When one wants to change section of a symbol and its aliases,
1497 symtab_node::set_section_for_node (const char *section
)
1499 const char *current
= get_section ();
1500 section_hash_entry
**slot
;
1502 if (current
== section
1503 || (current
&& section
1504 && !strcmp (current
, section
)))
1509 x_section
->ref_count
--;
1510 if (!x_section
->ref_count
)
1512 hashval_t hash
= htab_hash_string (x_section
->name
);
1513 slot
= symtab
->section_hash
->find_slot_with_hash (x_section
->name
,
1515 ggc_free (x_section
);
1516 symtab
->section_hash
->clear_slot (slot
);
1522 implicit_section
= false;
1525 if (!symtab
->section_hash
)
1526 symtab
->section_hash
= hash_table
<section_name_hasher
>::create_ggc (10);
1527 slot
= symtab
->section_hash
->find_slot_with_hash (section
,
1528 htab_hash_string (section
),
1531 x_section
= (section_hash_entry
*)*slot
;
1534 int len
= strlen (section
);
1535 *slot
= x_section
= ggc_cleared_alloc
<section_hash_entry
> ();
1536 x_section
->name
= ggc_vec_alloc
<char> (len
+ 1);
1537 memcpy (x_section
->name
, section
, len
+ 1);
1539 x_section
->ref_count
++;
1542 /* Worker for set_section. */
1545 symtab_node::set_section (symtab_node
*n
, void *s
)
1547 n
->set_section_for_node ((char *)s
);
1551 /* Set section of symbol and its aliases. */
1554 symtab_node::set_section (const char *section
)
1556 gcc_assert (!this->alias
);
1557 call_for_symbol_and_aliases
1558 (symtab_node::set_section
, const_cast<char *>(section
), true);
1561 /* Return the initialization priority. */
1564 symtab_node::get_init_priority ()
1566 if (!this->in_init_priority_hash
)
1567 return DEFAULT_INIT_PRIORITY
;
1569 symbol_priority_map
*h
= symtab
->init_priority_hash
->get (this);
1570 return h
? h
->init
: DEFAULT_INIT_PRIORITY
;
1573 /* Return the finalization priority. */
1576 cgraph_node::get_fini_priority ()
1578 if (!this->in_init_priority_hash
)
1579 return DEFAULT_INIT_PRIORITY
;
1580 symbol_priority_map
*h
= symtab
->init_priority_hash
->get (this);
1581 return h
? h
->fini
: DEFAULT_INIT_PRIORITY
;
1584 /* Return the initialization and finalization priority information for
1585 DECL. If there is no previous priority information, a freshly
1586 allocated structure is returned. */
1588 symbol_priority_map
*
1589 symtab_node::priority_info (void)
1591 if (!symtab
->init_priority_hash
)
1592 symtab
->init_priority_hash
= hash_map
<symtab_node
*, symbol_priority_map
>::create_ggc (13);
1595 symbol_priority_map
*h
1596 = &symtab
->init_priority_hash
->get_or_insert (this, &existed
);
1599 h
->init
= DEFAULT_INIT_PRIORITY
;
1600 h
->fini
= DEFAULT_INIT_PRIORITY
;
1601 in_init_priority_hash
= true;
1607 /* Set initialization priority to PRIORITY. */
1610 symtab_node::set_init_priority (priority_type priority
)
1612 symbol_priority_map
*h
;
1614 if (is_a
<cgraph_node
*> (this))
1615 gcc_assert (DECL_STATIC_CONSTRUCTOR (this->decl
));
1617 if (priority
== DEFAULT_INIT_PRIORITY
)
1619 gcc_assert (get_init_priority() == priority
);
1622 h
= priority_info ();
1626 /* Set fialization priority to PRIORITY. */
1629 cgraph_node::set_fini_priority (priority_type priority
)
1631 symbol_priority_map
*h
;
1633 gcc_assert (DECL_STATIC_DESTRUCTOR (this->decl
));
1635 if (priority
== DEFAULT_INIT_PRIORITY
)
1637 gcc_assert (get_fini_priority() == priority
);
1640 h
= priority_info ();
1644 /* Worker for symtab_resolve_alias. */
1647 symtab_node::set_implicit_section (symtab_node
*n
,
1648 void *data ATTRIBUTE_UNUSED
)
1650 n
->implicit_section
= true;
1654 /* Add reference recording that symtab node is alias of TARGET.
1655 The function can fail in the case of aliasing cycles; in this case
1656 it returns false. */
1659 symtab_node::resolve_alias (symtab_node
*target
, bool transparent
)
1663 gcc_assert (!analyzed
&& !vec_safe_length (ref_list
.references
));
1665 /* Never let cycles to creep into the symbol table alias references;
1666 those will make alias walkers to be infinite. */
1667 for (n
= target
; n
&& n
->alias
;
1668 n
= n
->analyzed
? n
->get_alias_target () : NULL
)
1671 if (is_a
<cgraph_node
*> (this))
1672 error ("function %q+D part of alias cycle", decl
);
1673 else if (is_a
<varpool_node
*> (this))
1674 error ("variable %q+D part of alias cycle", decl
);
1681 /* "analyze" the node - i.e. mark the reference. */
1685 transparent
|= transparent_alias
;
1686 transparent_alias
= transparent
;
1688 while (target
->transparent_alias
&& target
->analyzed
)
1689 target
= target
->get_alias_target ();
1690 create_reference (target
, IPA_REF_ALIAS
, NULL
);
1692 /* Add alias into the comdat group of its target unless it is already there. */
1693 if (same_comdat_group
)
1694 remove_from_same_comdat_group ();
1695 set_comdat_group (NULL
);
1696 if (target
->get_comdat_group ())
1697 add_to_same_comdat_group (target
);
1699 if ((get_section () != target
->get_section ()
1700 || target
->get_comdat_group ()) && get_section () && !implicit_section
)
1702 error ("section of alias %q+D must match section of its target", decl
);
1704 call_for_symbol_and_aliases (symtab_node::set_section
,
1705 const_cast<char *>(target
->get_section ()), true);
1706 if (target
->implicit_section
)
1707 call_for_symbol_and_aliases (set_implicit_section
, NULL
, true);
1709 /* Alias targets become redundant after alias is resolved into an reference.
1710 We do not want to keep it around or we would have to mind updating them
1711 when renaming symbols. */
1712 alias_target
= NULL
;
1714 if (!transparent
&& cpp_implicit_alias
&& symtab
->state
>= CONSTRUCTION
)
1715 fixup_same_cpp_alias_visibility (target
);
1717 /* If alias has address taken, so does the target. */
1719 target
->ultimate_alias_target ()->address_taken
= true;
1721 /* All non-transparent aliases of THIS are now in fact aliases of TARGET.
1722 If alias is transparent, also all transparent aliases of THIS are now
1724 Also merge same comdat group lists. */
1726 for (unsigned i
= 0; iterate_direct_aliases (i
, ref
);)
1728 struct symtab_node
*alias_alias
= ref
->referring
;
1729 if (alias_alias
->get_comdat_group ())
1731 alias_alias
->remove_from_same_comdat_group ();
1732 alias_alias
->set_comdat_group (NULL
);
1733 if (target
->get_comdat_group ())
1734 alias_alias
->add_to_same_comdat_group (target
);
1736 if (!alias_alias
->transparent_alias
|| transparent
)
1738 alias_alias
->remove_all_references ();
1739 alias_alias
->create_reference (target
, IPA_REF_ALIAS
, NULL
);
1746 /* Worker searching noninterposable alias. */
1749 symtab_node::noninterposable_alias (symtab_node
*node
, void *data
)
1751 if (!node
->transparent_alias
&& decl_binds_to_current_def_p (node
->decl
))
1753 symtab_node
*fn
= node
->ultimate_alias_target ();
1755 /* Ensure that the alias is well formed this may not be the case
1756 of user defined aliases and currently it is not always the case
1757 of C++ same body aliases (that is a bug). */
1758 if (TREE_TYPE (node
->decl
) != TREE_TYPE (fn
->decl
)
1759 || DECL_CONTEXT (node
->decl
) != DECL_CONTEXT (fn
->decl
)
1760 || (TREE_CODE (node
->decl
) == FUNCTION_DECL
1761 && flags_from_decl_or_type (node
->decl
)
1762 != flags_from_decl_or_type (fn
->decl
))
1763 || DECL_ATTRIBUTES (node
->decl
) != DECL_ATTRIBUTES (fn
->decl
))
1765 *(symtab_node
**)data
= node
;
1771 /* If node cannot be overwriten by static or dynamic linker to point to
1772 different definition, return NODE. Otherwise look for alias with such
1773 property and if none exists, introduce new one. */
1776 symtab_node::noninterposable_alias (void)
1779 symtab_node
*new_node
= NULL
;
1781 /* First try to look up existing alias or base object
1782 (if that is already non-overwritable). */
1783 symtab_node
*node
= ultimate_alias_target ();
1784 gcc_assert (!node
->alias
&& !node
->weakref
);
1785 node
->call_for_symbol_and_aliases (symtab_node::noninterposable_alias
,
1786 (void *)&new_node
, true);
1790 /* If aliases aren't supported by the assembler, fail. */
1791 if (!TARGET_SUPPORTS_ALIASES
)
1794 /* Otherwise create a new one. */
1795 new_decl
= copy_node (node
->decl
);
1796 DECL_DLLIMPORT_P (new_decl
) = 0;
1797 DECL_NAME (new_decl
) = clone_function_name (node
->decl
, "localalias");
1798 if (TREE_CODE (new_decl
) == FUNCTION_DECL
)
1799 DECL_STRUCT_FUNCTION (new_decl
) = NULL
;
1800 DECL_INITIAL (new_decl
) = NULL
;
1801 SET_DECL_ASSEMBLER_NAME (new_decl
, DECL_NAME (new_decl
));
1802 SET_DECL_RTL (new_decl
, NULL
);
1804 /* Update the properties. */
1805 DECL_EXTERNAL (new_decl
) = 0;
1806 TREE_PUBLIC (new_decl
) = 0;
1807 DECL_COMDAT (new_decl
) = 0;
1808 DECL_WEAK (new_decl
) = 0;
1810 /* Since the aliases can be added to vtables, keep DECL_VIRTUAL flag. */
1811 DECL_VIRTUAL_P (new_decl
) = DECL_VIRTUAL_P (node
->decl
);
1812 if (TREE_CODE (new_decl
) == FUNCTION_DECL
)
1814 DECL_STATIC_CONSTRUCTOR (new_decl
) = 0;
1815 DECL_STATIC_DESTRUCTOR (new_decl
) = 0;
1816 new_node
= cgraph_node::create_alias (new_decl
, node
->decl
);
1820 TREE_READONLY (new_decl
) = TREE_READONLY (node
->decl
);
1821 DECL_INITIAL (new_decl
) = error_mark_node
;
1822 new_node
= varpool_node::create_alias (new_decl
, node
->decl
);
1824 new_node
->resolve_alias (node
);
1825 gcc_assert (decl_binds_to_current_def_p (new_decl
)
1826 && targetm
.binds_local_p (new_decl
));
1830 /* Return true if symtab node and TARGET represents
1831 semantically equivalent symbols. */
1834 symtab_node::semantically_equivalent_p (symtab_node
*target
)
1836 enum availability avail
;
1840 /* Equivalent functions are equivalent. */
1841 if (decl
== target
->decl
)
1844 /* If symbol is not overwritable by different implementation,
1845 walk to the base object it defines. */
1846 ba
= ultimate_alias_target (&avail
);
1847 if (avail
>= AVAIL_AVAILABLE
)
1854 bb
= target
->ultimate_alias_target (&avail
);
1855 if (avail
>= AVAIL_AVAILABLE
)
1865 /* Classify symbol symtab node for partitioning. */
1867 enum symbol_partitioning_class
1868 symtab_node::get_partitioning_class (void)
1870 /* Inline clones are always duplicated.
1871 This include external delcarations. */
1872 cgraph_node
*cnode
= dyn_cast
<cgraph_node
*> (this);
1874 if (DECL_ABSTRACT_P (decl
))
1875 return SYMBOL_EXTERNAL
;
1877 if (cnode
&& cnode
->global
.inlined_to
)
1878 return SYMBOL_DUPLICATE
;
1880 /* Transparent aliases are always duplicated. */
1881 if (transparent_alias
)
1882 return definition
? SYMBOL_DUPLICATE
: SYMBOL_EXTERNAL
;
1884 /* External declarations are external. */
1885 if (DECL_EXTERNAL (decl
))
1886 return SYMBOL_EXTERNAL
;
1888 if (varpool_node
*vnode
= dyn_cast
<varpool_node
*> (this))
1890 if (alias
&& definition
&& !ultimate_alias_target ()->definition
)
1891 return SYMBOL_EXTERNAL
;
1892 /* Constant pool references use local symbol names that cannot
1893 be promoted global. We should never put into a constant pool
1894 objects that cannot be duplicated across partitions. */
1895 if (DECL_IN_CONSTANT_POOL (decl
))
1896 return SYMBOL_DUPLICATE
;
1897 if (DECL_HARD_REGISTER (decl
))
1898 return SYMBOL_DUPLICATE
;
1899 gcc_checking_assert (vnode
->definition
);
1901 /* Functions that are cloned may stay in callgraph even if they are unused.
1902 Handle them as external; compute_ltrans_boundary take care to make
1903 proper things to happen (i.e. to make them appear in the boundary but
1904 with body streamed, so clone can me materialized). */
1905 else if (!dyn_cast
<cgraph_node
*> (this)->function_symbol ()->definition
)
1906 return SYMBOL_EXTERNAL
;
1908 /* Linker discardable symbols are duplicated to every use unless they are
1910 if (DECL_ONE_ONLY (decl
)
1913 && !used_from_object_file_p ())
1914 return SYMBOL_DUPLICATE
;
1916 return SYMBOL_PARTITION
;
1919 /* Return true when symbol is known to be non-zero. */
1922 symtab_node::nonzero_address ()
1924 /* Weakrefs may be NULL when their target is not defined. */
1925 if (alias
&& weakref
)
1929 symtab_node
*target
= ultimate_alias_target ();
1931 if (target
->alias
&& target
->weakref
)
1933 /* We cannot recurse to target::nonzero. It is possible that the
1934 target is used only via the alias.
1935 We may walk references and look for strong use, but we do not know
1936 if this strong use will survive to final binary, so be
1938 ??? Maybe we could do the lookup during late optimization that
1939 could be useful to eliminate the NULL pointer checks in LTO
1941 if (target
->definition
&& !DECL_EXTERNAL (target
->decl
))
1943 if (target
->resolution
!= LDPR_UNKNOWN
1944 && target
->resolution
!= LDPR_UNDEF
1945 && !target
->can_be_discarded_p ()
1946 && flag_delete_null_pointer_checks
)
1954 /* With !flag_delete_null_pointer_checks we assume that symbols may
1955 bind to NULL. This is on by default on embedded targets only.
1957 Otherwise all non-WEAK symbols must be defined and thus non-NULL or
1958 linking fails. Important case of WEAK we want to do well are comdats.
1959 Those are handled by later check for definition.
1961 When parsing, beware the cases when WEAK attribute is added later. */
1962 if (!DECL_WEAK (decl
)
1963 && flag_delete_null_pointer_checks
)
1965 refuse_visibility_changes
= true;
1969 /* If target is defined and either comdat or not extern, we know it will be
1970 output and thus it will bind to non-NULL.
1971 Play safe for flag_delete_null_pointer_checks where weak definition may
1972 be re-defined by NULL. */
1973 if (definition
&& (!DECL_EXTERNAL (decl
) || DECL_COMDAT (decl
))
1974 && (flag_delete_null_pointer_checks
|| !DECL_WEAK (decl
)))
1976 if (!DECL_WEAK (decl
))
1977 refuse_visibility_changes
= true;
1981 /* As the last resort, check the resolution info. */
1982 if (resolution
!= LDPR_UNKNOWN
1983 && resolution
!= LDPR_UNDEF
1984 && !can_be_discarded_p ()
1985 && flag_delete_null_pointer_checks
)
1990 /* Return 0 if symbol is known to have different address than S2,
1991 Return 1 if symbol is known to have same address as S2,
1992 return -1 otherwise.
1994 If MEMORY_ACCESSED is true, assume that both memory pointer to THIS
1995 and S2 is going to be accessed. This eliminates the situations when
1996 either THIS or S2 is NULL and is seful for comparing bases when deciding
1997 about memory aliasing. */
1999 symtab_node::equal_address_to (symtab_node
*s2
, bool memory_accessed
)
2001 enum availability avail1
, avail2
;
2003 /* A Shortcut: equivalent symbols are always equivalent. */
2007 /* Unwind transparent aliases first; those are always equal to their
2009 if (this->transparent_alias
&& this->analyzed
)
2010 return this->get_alias_target ()->equal_address_to (s2
);
2011 while (s2
->transparent_alias
&& s2
->analyzed
)
2012 s2
= s2
->get_alias_target();
2017 /* For non-interposable aliases, lookup and compare their actual definitions.
2018 Also check if the symbol needs to bind to given definition. */
2019 symtab_node
*rs1
= ultimate_alias_target (&avail1
);
2020 symtab_node
*rs2
= s2
->ultimate_alias_target (&avail2
);
2021 bool binds_local1
= rs1
->analyzed
&& decl_binds_to_current_def_p (this->decl
);
2022 bool binds_local2
= rs2
->analyzed
&& decl_binds_to_current_def_p (s2
->decl
);
2023 bool really_binds_local1
= binds_local1
;
2024 bool really_binds_local2
= binds_local2
;
2026 /* Addresses of vtables and virtual functions cannot be used by user
2027 code and are used only within speculation. In this case we may make
2028 symbol equivalent to its alias even if interposition may break this
2029 rule. Doing so will allow us to turn speculative inlining into
2030 non-speculative more agressively. */
2031 if (DECL_VIRTUAL_P (this->decl
) && avail1
>= AVAIL_AVAILABLE
)
2032 binds_local1
= true;
2033 if (DECL_VIRTUAL_P (s2
->decl
) && avail2
>= AVAIL_AVAILABLE
)
2034 binds_local2
= true;
2036 /* If both definitions are available we know that even if they are bound
2037 to other unit they must be defined same way and therefore we can use
2038 equivalence test. */
2039 if (rs1
!= rs2
&& avail1
>= AVAIL_AVAILABLE
&& avail2
>= AVAIL_AVAILABLE
)
2040 binds_local1
= binds_local2
= true;
2042 if (binds_local1
&& binds_local2
&& rs1
== rs2
)
2044 /* We made use of the fact that alias is not weak. */
2046 refuse_visibility_changes
= true;
2048 s2
->refuse_visibility_changes
= true;
2052 /* If both symbols may resolve to NULL, we cannot really prove them
2054 if (!memory_accessed
&& !nonzero_address () && !s2
->nonzero_address ())
2057 /* Except for NULL, functions and variables never overlap. */
2058 if (TREE_CODE (decl
) != TREE_CODE (s2
->decl
))
2061 /* If one of the symbols is unresolved alias, punt. */
2062 if (rs1
->alias
|| rs2
->alias
)
2065 /* If we have a non-interposale definition of at least one of the symbols
2066 and the other symbol is different, we know other unit cannot interpose
2067 it to the first symbol; all aliases of the definition needs to be
2068 present in the current unit. */
2069 if (((really_binds_local1
|| really_binds_local2
)
2070 /* If we have both definitions and they are different, we know they
2071 will be different even in units they binds to. */
2072 || (binds_local1
&& binds_local2
))
2075 /* We make use of the fact that one symbol is not alias of the other
2076 and that the definition is non-interposable. */
2077 refuse_visibility_changes
= true;
2078 s2
->refuse_visibility_changes
= true;
2079 rs1
->refuse_visibility_changes
= true;
2080 rs2
->refuse_visibility_changes
= true;
2084 /* TODO: Alias oracle basically assume that addresses of global variables
2085 are different unless they are declared as alias of one to another while
2086 the code folding comparsions doesn't.
2087 We probably should be consistent and use this fact here, too, but for
2088 the moment return false only when we are called from the alias oracle. */
2090 return memory_accessed
&& rs1
!= rs2
? 0 : -1;
2093 /* Worker for call_for_symbol_and_aliases. */
2096 symtab_node::call_for_symbol_and_aliases_1 (bool (*callback
) (symtab_node
*,
2099 bool include_overwritable
)
2102 FOR_EACH_ALIAS (this, ref
)
2104 symtab_node
*alias
= ref
->referring
;
2105 if (include_overwritable
2106 || alias
->get_availability () > AVAIL_INTERPOSABLE
)
2107 if (alias
->call_for_symbol_and_aliases (callback
, data
,
2108 include_overwritable
))
2114 /* Return true if address of N is possibly compared. */
2117 address_matters_1 (symtab_node
*n
, void *)
2119 struct ipa_ref
*ref
;
2121 if (!n
->address_can_be_compared_p ())
2123 if (n
->externally_visible
|| n
->force_output
)
2126 for (unsigned int i
= 0; n
->iterate_referring (i
, ref
); i
++)
2127 if (ref
->address_matters_p ())
2132 /* Return true if symbol's address may possibly be compared to other
2133 symbol's address. */
2136 symtab_node::address_matters_p ()
2138 gcc_assert (!alias
);
2139 return call_for_symbol_and_aliases (address_matters_1
, NULL
, true);
2142 /* Return true if symbol's alignment may be increased. */
2145 symtab_node::can_increase_alignment_p (void)
2147 symtab_node
*target
= ultimate_alias_target ();
2149 /* For now support only variables. */
2153 /* With -fno-toplevel-reorder we may have already output the constant. */
2154 if (TREE_ASM_WRITTEN (target
->decl
))
2157 /* If target is already placed in an anchor, we cannot touch its
2159 if (DECL_RTL_SET_P (target
->decl
)
2160 && MEM_P (DECL_RTL (target
->decl
))
2161 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (DECL_RTL (target
->decl
), 0)))
2164 /* Constant pool entries may be shared. */
2165 if (DECL_IN_CONSTANT_POOL (target
->decl
))
2168 /* We cannot change alignment of symbols that may bind to symbols
2169 in other translation unit that may contain a definition with lower
2171 if (!decl_binds_to_current_def_p (decl
))
2174 /* When compiling partition, be sure the symbol is not output by other
2177 && (target
->in_other_partition
2178 || target
->get_partitioning_class () == SYMBOL_DUPLICATE
))
2181 /* Do not override the alignment as specified by the ABI when the used
2182 attribute is set. */
2183 if (DECL_PRESERVE_P (decl
) || DECL_PRESERVE_P (target
->decl
))
2186 /* Do not override explicit alignment set by the user when an explicit
2187 section name is also used. This is a common idiom used by many
2188 software projects. */
2189 if (DECL_SECTION_NAME (target
->decl
) != NULL
&& !target
->implicit_section
)
2195 /* Worker for symtab_node::increase_alignment. */
2198 increase_alignment_1 (symtab_node
*n
, void *v
)
2200 unsigned int align
= (size_t)v
;
2201 if (DECL_ALIGN (n
->decl
) < align
2202 && n
->can_increase_alignment_p ())
2204 SET_DECL_ALIGN (n
->decl
, align
);
2205 DECL_USER_ALIGN (n
->decl
) = 1;
2210 /* Increase alignment of THIS to ALIGN. */
2213 symtab_node::increase_alignment (unsigned int align
)
2215 gcc_assert (can_increase_alignment_p () && align
<= MAX_OFILE_ALIGNMENT
);
2216 ultimate_alias_target()->call_for_symbol_and_aliases (increase_alignment_1
,
2217 (void *)(size_t) align
,
2219 gcc_assert (DECL_ALIGN (decl
) >= align
);
2222 /* Helper for symtab_node::definition_alignment. */
2225 get_alignment_1 (symtab_node
*n
, void *v
)
2227 *((unsigned int *)v
) = MAX (*((unsigned int *)v
), DECL_ALIGN (n
->decl
));
2231 /* Return desired alignment of the definition. This is NOT alignment useful
2232 to access THIS, because THIS may be interposable and DECL_ALIGN should
2233 be used instead. It however must be guaranteed when output definition
2237 symtab_node::definition_alignment ()
2239 unsigned int align
= 0;
2240 gcc_assert (!alias
);
2241 call_for_symbol_and_aliases (get_alignment_1
, &align
, true);
2245 /* Return symbol used to separate symbol name from suffix. */
2248 symbol_table::symbol_suffix_separator ()
2250 #ifndef NO_DOT_IN_LABEL
2252 #elif !defined NO_DOLLAR_IN_LABEL
2259 /* Return true when references to this symbol from REF must bind to current
2260 definition in final executable. */
2263 symtab_node::binds_to_current_def_p (symtab_node
*ref
)
2267 if (transparent_alias
)
2269 && get_alias_target()->binds_to_current_def_p (ref
);
2270 cgraph_node
*cnode
= dyn_cast
<cgraph_node
*> (this);
2271 if (cnode
&& cnode
->ifunc_resolver
)
2273 if (decl_binds_to_current_def_p (decl
))
2276 /* Inline clones always binds locally. */
2277 if (cnode
&& cnode
->global
.inlined_to
)
2280 if (DECL_EXTERNAL (decl
))
2283 gcc_assert (externally_visible
);
2287 cgraph_node
*cref
= dyn_cast
<cgraph_node
*> (ref
);
2289 ref
= cref
->global
.inlined_to
;
2292 /* If this is a reference from symbol itself and there are no aliases, we
2293 may be sure that the symbol was not interposed by something else because
2294 the symbol itself would be unreachable otherwise. This is important
2295 to optimize recursive functions well.
2297 This assumption may be broken by inlining: if symbol is interposable
2298 but the body is available (i.e. declared inline), inliner may make
2299 the body reachable even with interposition. */
2300 if (this == ref
&& !has_aliases_p ()
2302 || symtab
->state
>= IPA_SSA_AFTER_INLINING
2303 || get_availability () >= AVAIL_INTERPOSABLE
))
2307 /* References within one comdat group are always bound in a group. */
2309 && symtab
->state
>= IPA_SSA_AFTER_INLINING
2310 && get_comdat_group ()
2311 && get_comdat_group () == ref
->get_comdat_group ())
2317 /* Return true if symbol should be output to the symbol table. */
2320 symtab_node::output_to_lto_symbol_table_p (void)
2322 /* Only externally visible symbols matter. */
2323 if (!TREE_PUBLIC (decl
))
2325 if (!real_symbol_p ())
2327 /* FIXME: variables probably should not be considered as real symbols at
2329 if (VAR_P (decl
) && DECL_HARD_REGISTER (decl
))
2331 /* FIXME: Builtins corresponding to real functions probably should have
2332 symbol table entries. */
2333 if (TREE_CODE (decl
) == FUNCTION_DECL
&& fndecl_built_in_p (decl
))
2336 /* We have real symbol that should be in symbol table. However try to trim
2337 down the refernces to libraries bit more because linker will otherwise
2338 bring unnecesary object files into the final link.
2339 FIXME: The following checks can easily be confused i.e. by self recursive
2340 function or self-referring variable. */
2342 /* We keep external functions in symtab for sake of inlining
2343 and devirtualization. We do not want to see them in symbol table as
2344 references unless they are really used. */
2345 cgraph_node
*cnode
= dyn_cast
<cgraph_node
*> (this);
2346 if (cnode
&& (!definition
|| DECL_EXTERNAL (decl
))
2350 /* Ignore all references from external vars initializers - they are not really
2351 part of the compilation unit until they are used by folding. Some symbols,
2352 like references to external construction vtables cannot be referred to at
2353 all. We decide this at can_refer_decl_in_current_unit_p. */
2354 if (!definition
|| DECL_EXTERNAL (decl
))
2357 struct ipa_ref
*ref
;
2358 for (i
= 0; iterate_referring (i
, ref
); i
++)
2360 if (ref
->use
== IPA_REF_ALIAS
)
2362 if (is_a
<cgraph_node
*> (ref
->referring
))
2364 if (!DECL_EXTERNAL (ref
->referring
->decl
))