1 /* Callgraph handling code.
2 Copyright (C) 2003-2020 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/>. */
24 #include "profile-count.h"
26 #include "plugin-api.h"
27 #include "ipa-param-manipulation.h"
29 extern void debuginfo_early_init (void);
30 extern void debuginfo_init (void);
31 extern void debuginfo_fini (void);
32 extern void debuginfo_start (void);
33 extern void debuginfo_stop (void);
34 extern void debuginfo_early_start (void);
35 extern void debuginfo_early_stop (void);
38 typedef ipa_opt_pass_d
*ipa_opt_pass
;
40 /* Symbol table consists of functions and variables.
41 TODO: add labels and CONST_DECLs. */
49 /* Section names are stored as reference counted strings in GGC safe hashtable
50 (to make them survive through PCH). */
52 struct GTY((for_user
)) section_hash_entry
55 char *name
; /* As long as this datastructure stays in GGC, we cannot put
56 string at the tail of structure of GGC dies in horrible
60 struct section_name_hasher
: ggc_ptr_hash
<section_hash_entry
>
62 typedef const char *compare_type
;
64 static hashval_t
hash (section_hash_entry
*);
65 static bool equal (section_hash_entry
*, const char *);
70 /* Not yet set by cgraph_function_body_availability. */
72 /* Function body/variable initializer is unknown. */
74 /* Function body/variable initializer is known but might be replaced
75 by a different one from other compilation unit and thus needs to
76 be dealt with a care. Like AVAIL_NOT_AVAILABLE it can have
77 arbitrary side effects on escaping variables and functions, while
78 like AVAILABLE it might access static variables. */
80 /* Function body/variable initializer is known and will be used in final
83 /* Function body/variable initializer is known and all it's uses are
84 explicitly visible within current unit (i.e. it's address is never taken
85 and it is not exported to other units). Currently used only for
90 /* Classification of symbols WRT partitioning. */
91 enum symbol_partitioning_class
93 /* External declarations are ignored by partitioning algorithms and they are
94 added into the boundary later via compute_ltrans_boundary. */
96 /* Partitioned symbols are put into one of partitions. */
98 /* Duplicated symbols (such as comdat or constant pool references) are
99 copied into every node needing them via add_symbol_to_partition. */
103 /* Base of all entries in the symbol table.
104 The symtab_node is inherited by cgraph and varpol nodes. */
105 struct GTY((desc ("%h.type"), tag ("SYMTAB_SYMBOL"),
106 chain_next ("%h.next"), chain_prev ("%h.previous")))
110 friend class symbol_table
;
113 explicit symtab_node (symtab_type t
)
114 : type (t
), resolution (LDPR_UNKNOWN
), definition (false), alias (false),
115 transparent_alias (false), weakref (false), cpp_implicit_alias (false),
116 symver (false), analyzed (false), writeonly (false),
117 refuse_visibility_changes (false), externally_visible (false),
118 no_reorder (false), force_output (false), forced_by_abi (false),
119 unique_name (false), implicit_section (false), body_removed (false),
120 used_from_other_partition (false), in_other_partition (false),
121 address_taken (false), in_init_priority_hash (false),
122 need_lto_streaming (false), offloadable (false), ifunc_resolver (false),
123 order (false), next_sharing_asm_name (NULL
),
124 previous_sharing_asm_name (NULL
), same_comdat_group (NULL
), ref_list (),
125 alias_target (NULL
), lto_file_data (NULL
), aux (NULL
),
126 x_comdat_group (NULL_TREE
), x_section (NULL
)
130 const char *name () const;
132 /* Return dump name. */
133 const char *dump_name () const;
135 /* Return asm name. */
136 const char *asm_name () const;
138 /* Return dump name with assembler name. */
139 const char *dump_asm_name () const;
141 /* Return visibility name. */
142 const char *get_visibility_string () const;
144 /* Return type_name name. */
145 const char *get_symtab_type_string () const;
147 /* Add node into symbol table. This function is not used directly, but via
148 cgraph/varpool node creation routines. */
149 void register_symbol (void);
151 /* Remove symbol from symbol table. */
154 /* Dump symtab node to F. */
157 /* Dump symtab callgraph in graphviz format. */
158 void dump_graphviz (FILE *f
);
160 /* Dump symtab node to stderr. */
161 void DEBUG_FUNCTION
debug (void);
163 /* Verify consistency of node. */
164 void DEBUG_FUNCTION
verify (void);
166 /* Return ipa reference from this symtab_node to
167 REFERRED_NODE or REFERRED_VARPOOL_NODE. USE_TYPE specify type
168 of the use and STMT the statement (if it exists). */
169 ipa_ref
*create_reference (symtab_node
*referred_node
,
170 enum ipa_ref_use use_type
);
172 /* Return ipa reference from this symtab_node to
173 REFERRED_NODE or REFERRED_VARPOOL_NODE. USE_TYPE specify type
174 of the use and STMT the statement (if it exists). */
175 ipa_ref
*create_reference (symtab_node
*referred_node
,
176 enum ipa_ref_use use_type
, gimple
*stmt
);
178 /* If VAL is a reference to a function or a variable, add a reference from
179 this symtab_node to the corresponding symbol table node. Return the new
180 reference or NULL if none was created. */
181 ipa_ref
*maybe_create_reference (tree val
, gimple
*stmt
);
183 /* Clone all references from symtab NODE to this symtab_node. */
184 void clone_references (symtab_node
*node
);
186 /* Remove all stmt references in non-speculative references.
187 Those are not maintained during inlining & clonning.
188 The exception are speculative references that are updated along
189 with callgraph edges associated with them. */
190 void clone_referring (symtab_node
*node
);
192 /* Clone reference REF to this symtab_node and set its stmt to STMT. */
193 ipa_ref
*clone_reference (ipa_ref
*ref
, gimple
*stmt
);
195 /* Find the structure describing a reference to REFERRED_NODE
196 and associated with statement STMT. */
197 ipa_ref
*find_reference (symtab_node
*referred_node
, gimple
*stmt
,
198 unsigned int lto_stmt_uid
);
200 /* Remove all references that are associated with statement STMT. */
201 void remove_stmt_references (gimple
*stmt
);
203 /* Remove all stmt references in non-speculative references.
204 Those are not maintained during inlining & clonning.
205 The exception are speculative references that are updated along
206 with callgraph edges associated with them. */
207 void clear_stmts_in_references (void);
209 /* Remove all references in ref list. */
210 void remove_all_references (void);
212 /* Remove all referring items in ref list. */
213 void remove_all_referring (void);
215 /* Dump references in ref list to FILE. */
216 void dump_references (FILE *file
);
218 /* Dump referring in list to FILE. */
219 void dump_referring (FILE *);
221 /* Get number of references for this node. */
222 inline unsigned num_references (void)
224 return ref_list
.references
? ref_list
.references
->length () : 0;
227 /* Iterates I-th reference in the list, REF is also set. */
228 ipa_ref
*iterate_reference (unsigned i
, ipa_ref
*&ref
);
230 /* Iterates I-th referring item in the list, REF is also set. */
231 ipa_ref
*iterate_referring (unsigned i
, ipa_ref
*&ref
);
233 /* Iterates I-th referring alias item in the list, REF is also set. */
234 ipa_ref
*iterate_direct_aliases (unsigned i
, ipa_ref
*&ref
);
236 /* Return true if symtab node and TARGET represents
237 semantically equivalent symbols. */
238 bool semantically_equivalent_p (symtab_node
*target
);
240 /* Classify symbol symtab node for partitioning. */
241 enum symbol_partitioning_class
get_partitioning_class (void);
243 /* Return comdat group. */
244 tree
get_comdat_group ()
246 return x_comdat_group
;
249 /* Return comdat group as identifier_node. */
250 tree
get_comdat_group_id ()
252 if (x_comdat_group
&& TREE_CODE (x_comdat_group
) != IDENTIFIER_NODE
)
253 x_comdat_group
= DECL_ASSEMBLER_NAME (x_comdat_group
);
254 return x_comdat_group
;
257 /* Set comdat group. */
258 void set_comdat_group (tree group
)
260 gcc_checking_assert (!group
|| TREE_CODE (group
) == IDENTIFIER_NODE
262 x_comdat_group
= group
;
265 /* Return section as string. */
266 const char * get_section ()
270 return x_section
->name
;
273 /* Remove node from same comdat group. */
274 void remove_from_same_comdat_group (void);
276 /* Add this symtab_node to the same comdat group that OLD is in. */
277 void add_to_same_comdat_group (symtab_node
*old_node
);
279 /* Dissolve the same_comdat_group list in which NODE resides. */
280 void dissolve_same_comdat_group_list (void);
282 /* Return true when symtab_node is known to be used from other (non-LTO)
283 object file. Known only when doing LTO via linker plugin. */
284 bool used_from_object_file_p (void);
286 /* Walk the alias chain to return the symbol NODE is alias of.
287 If NODE is not an alias, return NODE.
288 When AVAILABILITY is non-NULL, get minimal availability in the chain.
289 When REF is non-NULL, assume that reference happens in symbol REF
290 when determining the availability. */
291 symtab_node
*ultimate_alias_target (enum availability
*avail
= NULL
,
292 struct symtab_node
*ref
= NULL
);
294 /* Return next reachable static symbol with initializer after NODE. */
295 inline symtab_node
*next_defined_symbol (void);
297 /* Add reference recording that symtab node is alias of TARGET.
298 If TRANSPARENT is true make the alias to be transparent alias.
299 The function can fail in the case of aliasing cycles; in this case
301 bool resolve_alias (symtab_node
*target
, bool transparent
= false);
303 /* C++ FE sometimes change linkage flags after producing same
305 void fixup_same_cpp_alias_visibility (symtab_node
*target
);
307 /* Call callback on symtab node and aliases associated to this node.
308 When INCLUDE_OVERWRITABLE is false, overwritable aliases and thunks are
310 bool call_for_symbol_and_aliases (bool (*callback
) (symtab_node
*, void *),
312 bool include_overwrite
);
314 /* If node cannot be interposable by static or dynamic linker to point to
315 different definition, return this symbol. Otherwise look for alias with
316 such property and if none exists, introduce new one. */
317 symtab_node
*noninterposable_alias (void);
319 /* Return node that alias is aliasing. */
320 inline symtab_node
*get_alias_target (void);
322 /* Set section for symbol and its aliases. */
323 void set_section (const char *section
);
325 /* Set section, do not recurse into aliases.
326 When one wants to change section of symbol and its aliases,
328 void set_section_for_node (const char *section
);
330 /* Set initialization priority to PRIORITY. */
331 void set_init_priority (priority_type priority
);
333 /* Return the initialization priority. */
334 priority_type
get_init_priority ();
336 /* Return availability of NODE when referenced from REF. */
337 enum availability
get_availability (symtab_node
*ref
= NULL
);
339 /* During LTO stream-in this predicate can be used to check whether node
340 in question prevails in the linking to save some memory usage. */
341 bool prevailing_p (void);
343 /* Return true if NODE binds to current definition in final executable
344 when referenced from REF. If REF is NULL return conservative value
345 for any reference. */
346 bool binds_to_current_def_p (symtab_node
*ref
= NULL
);
348 /* Make DECL local. */
349 void make_decl_local (void);
351 /* Copy visibility from N. */
352 void copy_visibility_from (symtab_node
*n
);
354 /* Return desired alignment of the definition. This is NOT alignment useful
355 to access THIS, because THIS may be interposable and DECL_ALIGN should
356 be used instead. It however must be guaranteed when output definition
358 unsigned int definition_alignment ();
360 /* Return true if alignment can be increased. */
361 bool can_increase_alignment_p ();
363 /* Increase alignment of symbol to ALIGN. */
364 void increase_alignment (unsigned int align
);
366 /* Return true if list contains an alias. */
367 bool has_aliases_p (void);
369 /* Return true when the symbol is real symbol, i.e. it is not inline clone
370 or abstract function kept for debug info purposes only. */
371 bool real_symbol_p (void);
373 /* Return true when the symbol needs to be output to the LTO symbol table. */
374 bool output_to_lto_symbol_table_p (void);
376 /* Determine if symbol declaration is needed. That is, visible to something
377 either outside this translation unit, something magic in the system
378 configury. This function is used just during symbol creation. */
379 bool needed_p (void);
381 /* Return true if this symbol is a function from the C frontend specified
382 directly in RTL form (with "__RTL"). */
383 bool native_rtl_p () const;
385 /* Return true when there are references to the node. */
386 bool referred_to_p (bool include_self
= true);
388 /* Return true if symbol can be discarded by linker from the binary.
389 Assume that symbol is used (so there is no need to take into account
390 garbage collecting linkers)
392 This can happen for comdats, commons and weaks when they are prevailed
393 by other definition at static linking time. */
395 can_be_discarded_p (void)
397 return (DECL_EXTERNAL (decl
)
398 || ((get_comdat_group ()
399 || DECL_COMMON (decl
)
400 || (DECL_SECTION_NAME (decl
) && DECL_WEAK (decl
)))
401 && ((resolution
!= LDPR_PREVAILING_DEF
402 && resolution
!= LDPR_PREVAILING_DEF_IRONLY_EXP
)
403 || flag_incremental_link
)
404 && resolution
!= LDPR_PREVAILING_DEF_IRONLY
));
407 /* Return true if NODE is local to a particular COMDAT group, and must not
408 be named from outside the COMDAT. This is used for C++ decloned
410 inline bool comdat_local_p (void)
412 return (same_comdat_group
&& !TREE_PUBLIC (decl
));
415 /* Return true if ONE and TWO are part of the same COMDAT group. */
416 inline bool in_same_comdat_group_p (symtab_node
*target
);
418 /* Return true if symbol is known to be nonzero. */
419 bool nonzero_address ();
421 /* Return 0 if symbol is known to have different address than S2,
422 Return 1 if symbol is known to have same address as S2,
425 If MEMORY_ACCESSED is true, assume that both memory pointer to THIS
426 and S2 is going to be accessed. This eliminates the situations when
427 either THIS or S2 is NULL and is useful for comparing bases when deciding
428 about memory aliasing. */
429 int equal_address_to (symtab_node
*s2
, bool memory_accessed
= false);
431 /* Return true if symbol's address may possibly be compared to other
433 bool address_matters_p ();
435 /* Return true if NODE's address can be compared. This use properties
436 of NODE only and does not look if the address is actually taken in
437 interesting way. For that use ADDRESS_MATTERS_P instead. */
438 bool address_can_be_compared_p (void);
440 /* Return symbol table node associated with DECL, if any,
441 and NULL otherwise. */
442 static inline symtab_node
*get (const_tree decl
)
444 /* Check that we are called for sane type of object - functions
445 and static or external variables. */
446 gcc_checking_assert (TREE_CODE (decl
) == FUNCTION_DECL
447 || (TREE_CODE (decl
) == VAR_DECL
448 && (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)
450 /* Check that the mapping is sane - perhaps this check can go away,
451 but at the moment frontends tends to corrupt the mapping by calling
452 memcpy/memset on the tree nodes. */
453 gcc_checking_assert (!decl
->decl_with_vis
.symtab_node
454 || decl
->decl_with_vis
.symtab_node
->decl
== decl
);
455 return decl
->decl_with_vis
.symtab_node
;
458 /* Try to find a symtab node for declaration DECL and if it does not
459 exist or if it corresponds to an inline clone, create a new one. */
460 static inline symtab_node
* get_create (tree node
);
462 /* Return the cgraph node that has ASMNAME for its DECL_ASSEMBLER_NAME.
463 Return NULL if there's no such node. */
464 static symtab_node
*get_for_asmname (const_tree asmname
);
466 /* Verify symbol table for internal consistency. */
467 static DEBUG_FUNCTION
void verify_symtab_nodes (void);
469 /* Perform internal consistency checks, if they are enabled. */
470 static inline void checking_verify_symtab_nodes (void);
472 /* Type of the symbol. */
473 ENUM_BITFIELD (symtab_type
) type
: 8;
475 /* The symbols resolution. */
476 ENUM_BITFIELD (ld_plugin_symbol_resolution
) resolution
: 8;
478 /*** Flags representing the symbol type. ***/
480 /* True when symbol corresponds to a definition in current unit.
481 set via finalize_function or finalize_decl */
482 unsigned definition
: 1;
483 /* True when symbol is an alias.
484 Set by assemble_alias. */
486 /* When true the alias is translated into its target symbol either by GCC
487 or assembler (it also may just be a duplicate declaration of the same
490 Currently transparent aliases come in three different flavors
491 - aliases having the same assembler name as their target (aka duplicated
492 declarations). In this case the assembler names compare via
493 assembler_names_equal_p and weakref is false
494 - aliases that are renamed at a time being output to final file
495 by varasm.c. For those DECL_ASSEMBLER_NAME have
496 IDENTIFIER_TRANSPARENT_ALIAS set and thus also their assembler
498 Weakrefs belong to this category when we target assembler without
500 - weakrefs that are renamed by assembler via .weakref directive.
501 In this case the alias may or may not be definition (depending if
502 target declaration was seen by the compiler), weakref is set.
503 Unless we are before renaming statics, assembler names are different.
505 Given that we now support duplicate declarations, the second option is
506 redundant and will be removed. */
507 unsigned transparent_alias
: 1;
508 /* True when alias is a weakref. */
509 unsigned weakref
: 1;
510 /* C++ frontend produce same body aliases and extra name aliases for
511 virtual functions and vtables that are obviously equivalent.
512 Those aliases are bit special, especially because C++ frontend
513 visibility code is so ugly it cannot get them right at first time
514 and their visibility needs to be copied from their "masters" at
515 the end of parsing. */
516 unsigned cpp_implicit_alias
: 1;
517 /* The alias is a symbol version. */
519 /* Set once the definition was analyzed. The list of references and
520 other properties are built during analysis. */
521 unsigned analyzed
: 1;
522 /* Set for write-only variables. */
523 unsigned writeonly
: 1;
524 /* Visibility of symbol was used for further optimization; do not
525 permit further changes. */
526 unsigned refuse_visibility_changes
: 1;
528 /*** Visibility and linkage flags. ***/
530 /* Set when function is visible by other units. */
531 unsigned externally_visible
: 1;
532 /* Don't reorder to other symbols having this set. */
533 unsigned no_reorder
: 1;
534 /* The symbol will be assumed to be used in an invisible way (like
535 by an toplevel asm statement). */
536 unsigned force_output
: 1;
537 /* Like FORCE_OUTPUT, but in the case it is ABI requiring the symbol to be
538 exported. Unlike FORCE_OUTPUT this flag gets cleared to symbols promoted
539 to static and it does not inhibit optimization. */
540 unsigned forced_by_abi
: 1;
541 /* True when the name is known to be unique and thus it does not need mangling. */
542 unsigned unique_name
: 1;
543 /* Specify whether the section was set by user or by
544 compiler via -ffunction-sections. */
545 unsigned implicit_section
: 1;
546 /* True when body and other characteristics have been removed by
547 symtab_remove_unreachable_nodes. */
548 unsigned body_removed
: 1;
550 /*** WHOPR Partitioning flags.
551 These flags are used at ltrans stage when only part of the callgraph is
554 /* Set when variable is used from other LTRANS partition. */
555 unsigned used_from_other_partition
: 1;
556 /* Set when function is available in the other LTRANS partition.
557 During WPA output it is used to mark nodes that are present in
558 multiple partitions. */
559 unsigned in_other_partition
: 1;
563 /*** other flags. ***/
565 /* Set when symbol has address taken. */
566 unsigned address_taken
: 1;
567 /* Set when init priority is set. */
568 unsigned in_init_priority_hash
: 1;
570 /* Set when symbol needs to be streamed into LTO bytecode for LTO, or in case
571 of offloading, for separate compilation for a different target. */
572 unsigned need_lto_streaming
: 1;
574 /* Set when symbol can be streamed into bytecode for offloading. */
575 unsigned offloadable
: 1;
577 /* Set when symbol is an IFUNC resolver. */
578 unsigned ifunc_resolver
: 1;
581 /* Ordering of all symtab entries. */
584 /* Declaration representing the symbol. */
587 /* Linked list of symbol table entries starting with symtab_nodes. */
589 symtab_node
*previous
;
591 /* Linked list of symbols with the same asm name. There may be multiple
592 entries for single symbol name during LTO, because symbols are renamed
593 only after partitioning.
595 Because inline clones are kept in the assembler name has, they also produce
598 There are also several long standing bugs where frontends and builtin
599 code produce duplicated decls. */
600 symtab_node
*next_sharing_asm_name
;
601 symtab_node
*previous_sharing_asm_name
;
603 /* Circular list of nodes in the same comdat group if non-NULL. */
604 symtab_node
*same_comdat_group
;
606 /* Vectors of referring and referenced entities. */
607 ipa_ref_list ref_list
;
609 /* Alias target. May be either DECL pointer or ASSEMBLER_NAME pointer
610 depending to what was known to frontend on the creation time.
611 Once alias is resolved, this pointer become NULL. */
614 /* File stream where this node is being written to. */
615 struct lto_file_decl_data
* lto_file_data
;
617 PTR
GTY ((skip
)) aux
;
619 /* Comdat group the symbol is in. Can be private if GGC allowed that. */
622 /* Section name. Again can be private, if allowed. */
623 section_hash_entry
*x_section
;
626 /* Dump base fields of symtab nodes to F. Not to be used directly. */
627 void dump_base (FILE *);
629 /* Verify common part of symtab node. */
630 bool DEBUG_FUNCTION
verify_base (void);
632 /* Remove node from symbol table. This function is not used directly, but via
633 cgraph/varpool node removal routines. */
634 void unregister (void);
636 /* Return the initialization and finalization priority information for
637 DECL. If there is no previous priority information, a freshly
638 allocated structure is returned. */
639 struct symbol_priority_map
*priority_info (void);
641 /* Worker for call_for_symbol_and_aliases_1. */
642 bool call_for_symbol_and_aliases_1 (bool (*callback
) (symtab_node
*, void *),
644 bool include_overwrite
);
646 /* Worker for set_section. */
647 static bool set_section (symtab_node
*n
, void *s
);
649 /* Worker for symtab_resolve_alias. */
650 static bool set_implicit_section (symtab_node
*n
, void *);
652 /* Worker searching noninterposable alias. */
653 static bool noninterposable_alias (symtab_node
*node
, void *data
);
655 /* Worker for ultimate_alias_target. */
656 symtab_node
*ultimate_alias_target_1 (enum availability
*avail
= NULL
,
657 symtab_node
*ref
= NULL
);
659 /* Get dump name with normal or assembly name. */
660 const char *get_dump_name (bool asm_name_p
) const;
664 symtab_node::checking_verify_symtab_nodes (void)
667 symtab_node::verify_symtab_nodes ();
670 /* Walk all aliases for NODE. */
671 #define FOR_EACH_ALIAS(NODE, ALIAS) \
672 for (unsigned ALIAS##_iter_ = 0; \
673 (NODE)->iterate_direct_aliases (ALIAS##_iter_, ALIAS); \
676 /* This is the information that is put into the cgraph local structure
677 to recover a function. */
678 struct lto_file_decl_data
;
680 extern const char * const cgraph_availability_names
[];
681 extern const char * const ld_plugin_symbol_resolution_names
[];
682 extern const char * const tls_model_names
[];
684 /* Sub-structure of cgraph_node. Holds information about thunk, used only for
687 Thunks are basically wrappers around methods which are introduced in case
688 of multiple inheritance in order to adjust the value of the "this" pointer
689 or of the returned value.
691 In the case of this-adjusting thunks, each back-end can override the
692 can_output_mi_thunk/output_mi_thunk target hooks to generate a minimal thunk
693 (with a tail call for instance) directly as assembly. For the default hook
694 or for the case where the can_output_mi_thunk hooks return false, the thunk
695 is gimplified and lowered using the regular machinery. */
697 struct GTY(()) cgraph_thunk_info
{
698 /* Offset used to adjust "this". */
699 HOST_WIDE_INT fixed_offset
;
701 /* Offset in the virtual table to get the offset to adjust "this". Valid iff
702 VIRTUAL_OFFSET_P is true. */
703 HOST_WIDE_INT virtual_value
;
705 /* Offset from "this" to get the offset to adjust "this". Zero means: this
706 offset is to be ignored. */
707 HOST_WIDE_INT indirect_offset
;
709 /* Thunk target, i.e. the method that this thunk wraps. Depending on the
710 TARGET_USE_LOCAL_THUNK_ALIAS_P macro, this may have to be a new alias. */
713 /* Nonzero for a "this" adjusting thunk and zero for a result adjusting
717 /* If true, this thunk is what we call a virtual thunk. In this case:
718 * for this-adjusting thunks, after the FIXED_OFFSET based adjustment is
719 done, add to the result the offset found in the vtable at:
721 * for result-adjusting thunks, the FIXED_OFFSET adjustment is done after
723 bool virtual_offset_p
;
725 /* Set to true when alias node (the cgraph_node to which this struct belong)
726 is a thunk. Access to any other fields is invalid if this is false. */
730 /* Represent which DECL tree (or reference to such tree)
731 will be replaced by another tree while versioning. */
732 struct GTY(()) ipa_replace_map
734 /* The new (replacing) tree. */
736 /* Parameter number to replace, when old_tree is NULL. */
740 struct GTY(()) cgraph_clone_info
742 /* Constants discovered by IPA-CP, i.e. which parameter should be replaced
744 vec
<ipa_replace_map
*, va_gc
> *tree_map
;
745 /* Parameter modification that IPA-SRA decided to perform. */
746 ipa_param_adjustments
*param_adjustments
;
747 /* Lists of dummy-decl and offset pairs representing split formal parameters
748 in the caller. Offsets of all new replacements are enumerated, those
749 coming from the same original parameter have the same dummy decl stored
752 Dummy decls sit in call statement arguments followed by new parameter
753 decls (or their SSA names) in between (caller) clone materialization and
754 call redirection. Redirection then recognizes the dummy variable and
755 together with the stored offsets can reconstruct what exactly the new
756 parameter decls represent and can leave in place only those that the
758 vec
<ipa_param_performed_split
, va_gc
> *performed_splits
;
761 enum cgraph_simd_clone_arg_type
763 SIMD_CLONE_ARG_TYPE_VECTOR
,
764 SIMD_CLONE_ARG_TYPE_UNIFORM
,
765 /* These are only for integer/pointer arguments passed by value. */
766 SIMD_CLONE_ARG_TYPE_LINEAR_CONSTANT_STEP
,
767 SIMD_CLONE_ARG_TYPE_LINEAR_VARIABLE_STEP
,
768 /* These 6 are only for reference type arguments or arguments passed
770 SIMD_CLONE_ARG_TYPE_LINEAR_REF_CONSTANT_STEP
,
771 SIMD_CLONE_ARG_TYPE_LINEAR_REF_VARIABLE_STEP
,
772 SIMD_CLONE_ARG_TYPE_LINEAR_UVAL_CONSTANT_STEP
,
773 SIMD_CLONE_ARG_TYPE_LINEAR_UVAL_VARIABLE_STEP
,
774 SIMD_CLONE_ARG_TYPE_LINEAR_VAL_CONSTANT_STEP
,
775 SIMD_CLONE_ARG_TYPE_LINEAR_VAL_VARIABLE_STEP
,
776 SIMD_CLONE_ARG_TYPE_MASK
779 /* Function arguments in the original function of a SIMD clone.
780 Supplementary data for `struct simd_clone'. */
782 struct GTY(()) cgraph_simd_clone_arg
{
783 /* Original function argument as it originally existed in
787 /* orig_arg's function (or for extern functions type from
791 /* If argument is a vector, this holds the vector version of
792 orig_arg that after adjusting the argument types will live in
793 DECL_ARGUMENTS. Otherwise, this is NULL.
795 This basically holds:
796 vector(simdlen) __typeof__(orig_arg) new_arg. */
799 /* vector_arg's type (or for extern functions new vector type. */
802 /* If argument is a vector, this holds the array where the simd
803 argument is held while executing the simd clone function. This
804 is a local variable in the cloned function. Its content is
805 copied from vector_arg upon entry to the clone.
807 This basically holds:
808 __typeof__(orig_arg) simd_array[simdlen]. */
811 /* A SIMD clone's argument can be either linear (constant or
812 variable), uniform, or vector. */
813 enum cgraph_simd_clone_arg_type arg_type
;
815 /* For arg_type SIMD_CLONE_ARG_TYPE_LINEAR_*CONSTANT_STEP this is
816 the constant linear step, if arg_type is
817 SIMD_CLONE_ARG_TYPE_LINEAR_*VARIABLE_STEP, this is index of
818 the uniform argument holding the step, otherwise 0. */
819 HOST_WIDE_INT linear_step
;
821 /* Variable alignment if available, otherwise 0. */
822 unsigned int alignment
;
825 /* Specific data for a SIMD function clone. */
827 struct GTY(()) cgraph_simd_clone
{
828 /* Number of words in the SIMD lane associated with this clone. */
829 unsigned int simdlen
;
831 /* Number of annotated function arguments in `args'. This is
832 usually the number of named arguments in FNDECL. */
835 /* Max hardware vector size in bits for integral vectors. */
836 unsigned int vecsize_int
;
838 /* Max hardware vector size in bits for floating point vectors. */
839 unsigned int vecsize_float
;
841 /* Machine mode of the mask argument(s), if they are to be passed
842 as bitmasks in integer argument(s). VOIDmode if masks are passed
843 as vectors of characteristic type. */
844 machine_mode mask_mode
;
846 /* The mangling character for a given vector size. This is used
847 to determine the ISA mangling bit as specified in the Intel
849 unsigned char vecsize_mangle
;
851 /* True if this is the masked, in-branch version of the clone,
853 unsigned int inbranch
: 1;
855 /* Doubly linked list of SIMD clones. */
856 cgraph_node
*prev_clone
, *next_clone
;
858 /* Original cgraph node the SIMD clones were created for. */
861 /* Annotated function arguments for the original function. */
862 cgraph_simd_clone_arg
GTY((length ("%h.nargs"))) args
[1];
865 /* Function Multiversioning info. */
866 struct GTY((for_user
)) cgraph_function_version_info
{
867 /* The cgraph_node for which the function version info is stored. */
868 cgraph_node
*this_node
;
869 /* Chains all the semantically identical function versions. The
870 first function in this chain is the version_info node of the
872 cgraph_function_version_info
*prev
;
873 /* If this version node corresponds to a dispatcher for function
874 versions, this points to the version info node of the default
875 function, the first node in the chain. */
876 cgraph_function_version_info
*next
;
877 /* If this node corresponds to a function version, this points
878 to the dispatcher function decl, which is the function that must
879 be called to execute the right function version at run-time.
881 If this cgraph node is a dispatcher (if dispatcher_function is
882 true, in the cgraph_node struct) for function versions, this
883 points to resolver function, which holds the function body of the
884 dispatcher. The dispatcher decl is an alias to the resolver
886 tree dispatcher_resolver
;
889 #define DEFCIFCODE(code, type, string) CIF_ ## code,
890 /* Reasons for inlining failures. */
892 enum cgraph_inline_failed_t
{
893 #include "cif-code.def"
897 enum cgraph_inline_failed_type_t
899 CIF_FINAL_NORMAL
= 0,
905 struct cgraph_edge_hasher
: ggc_ptr_hash
<cgraph_edge
>
907 typedef gimple
*compare_type
;
909 static hashval_t
hash (cgraph_edge
*);
910 static hashval_t
hash (gimple
*);
911 static bool equal (cgraph_edge
*, gimple
*);
914 /* The cgraph data structure.
915 Each function decl has assigned cgraph_node listing callees and callers. */
917 struct GTY((tag ("SYMTAB_FUNCTION"))) cgraph_node
: public symtab_node
919 friend class symbol_table
;
922 explicit cgraph_node (int uid
)
923 : symtab_node (SYMTAB_FUNCTION
), callees (NULL
), callers (NULL
),
924 indirect_calls (NULL
),
925 next_sibling_clone (NULL
), prev_sibling_clone (NULL
), clones (NULL
),
926 clone_of (NULL
), call_site_hash (NULL
), former_clone_of (NULL
),
927 simdclone (NULL
), simd_clones (NULL
), ipa_transforms_to_apply (vNULL
),
928 inlined_to (NULL
), rtl (NULL
), clone (), thunk (),
929 count (profile_count::uninitialized ()),
930 count_materialization_scale (REG_BR_PROB_BASE
), profile_id (0),
931 unit_id (0), tp_first_run (0), used_as_abstract_origin (false),
932 lowered (false), process (false), frequency (NODE_FREQUENCY_NORMAL
),
933 only_called_at_startup (false), only_called_at_exit (false),
934 tm_clone (false), dispatcher_function (false), calls_comdat_local (false),
935 icf_merged (false), nonfreeing_fn (false), merged_comdat (false),
936 merged_extern_inline (false), parallelized_function (false),
937 split_part (false), indirect_call_target (false), local (false),
938 versionable (false), can_change_signature (false),
939 redefined_extern_inline (false), tm_may_enter_irr (false),
940 ipcp_clone (false), declare_variant_alt (false),
941 calls_declare_variant_alt (false), m_uid (uid
), m_summary_id (-1)
944 /* Remove the node from cgraph and all inline clones inlined into it.
945 Skip however removal of FORBIDDEN_NODE and return true if it needs to be
946 removed. This allows to call the function from outer loop walking clone
948 bool remove_symbol_and_inline_clones (cgraph_node
*forbidden_node
= NULL
);
950 /* Record all references from cgraph_node that are taken
951 in statement STMT. */
952 void record_stmt_references (gimple
*stmt
);
954 /* Like cgraph_set_call_stmt but walk the clone tree and update all
955 clones sharing the same function body.
956 When WHOLE_SPECULATIVE_EDGES is true, all three components of
957 speculative edge gets updated. Otherwise we update only direct
959 void set_call_stmt_including_clones (gimple
*old_stmt
, gcall
*new_stmt
,
960 bool update_speculative
= true);
962 /* Walk the alias chain to return the function cgraph_node is alias of.
963 Walk through thunk, too.
964 When AVAILABILITY is non-NULL, get minimal availability in the chain.
965 When REF is non-NULL, assume that reference happens in symbol REF
966 when determining the availability. */
967 cgraph_node
*function_symbol (enum availability
*avail
= NULL
,
968 struct symtab_node
*ref
= NULL
);
970 /* Walk the alias chain to return the function cgraph_node is alias of.
971 Walk through non virtual thunks, too. Thus we return either a function
972 or a virtual thunk node.
973 When AVAILABILITY is non-NULL, get minimal availability in the chain.
974 When REF is non-NULL, assume that reference happens in symbol REF
975 when determining the availability. */
976 cgraph_node
*function_or_virtual_thunk_symbol
977 (enum availability
*avail
= NULL
,
978 struct symtab_node
*ref
= NULL
);
980 /* Create node representing clone of N executed COUNT times. Decrease
981 the execution counts from original node too.
982 The new clone will have decl set to DECL that may or may not be the same
985 When UPDATE_ORIGINAL is true, the counts are subtracted from the original
986 function's profile to reflect the fact that part of execution is handled
988 When CALL_DUPLICATION_HOOK is true, the ipa passes are acknowledged about
989 the new clone. Otherwise the caller is responsible for doing so later.
991 If the new node is being inlined into another one, NEW_INLINED_TO should be
992 the outline function the new one is (even indirectly) inlined to.
993 All hooks will see this in node's inlined_to, when invoked.
994 Can be NULL if the node is not inlined. SUFFIX is string that is appended
995 to the original name. */
996 cgraph_node
*create_clone (tree decl
, profile_count count
,
997 bool update_original
,
998 vec
<cgraph_edge
*> redirect_callers
,
999 bool call_duplication_hook
,
1000 cgraph_node
*new_inlined_to
,
1001 ipa_param_adjustments
*param_adjustments
,
1002 const char *suffix
= NULL
);
1004 /* Create callgraph node clone with new declaration. The actual body will be
1005 copied later at compilation stage. The name of the new clone will be
1006 constructed from the name of the original node, SUFFIX and NUM_SUFFIX. */
1007 cgraph_node
*create_virtual_clone (vec
<cgraph_edge
*> redirect_callers
,
1008 vec
<ipa_replace_map
*, va_gc
> *tree_map
,
1009 ipa_param_adjustments
*param_adjustments
,
1010 const char * suffix
, unsigned num_suffix
);
1012 /* Remove the node from the tree of virtual and inline clones and make it a
1013 standalone node - not a clone any more. */
1014 void remove_from_clone_tree ();
1016 /* cgraph node being removed from symbol table; see if its entry can be
1017 replaced by other inline clone. */
1018 cgraph_node
*find_replacement (void);
1020 /* Create a new cgraph node which is the new version of
1021 callgraph node. REDIRECT_CALLERS holds the callers
1022 edges which should be redirected to point to
1023 NEW_VERSION. ALL the callees edges of the node
1024 are cloned to the new version node. Return the new
1027 If non-NULL BLOCK_TO_COPY determine what basic blocks
1028 was copied to prevent duplications of calls that are dead
1031 SUFFIX is string that is appended to the original name. */
1033 cgraph_node
*create_version_clone (tree new_decl
,
1034 vec
<cgraph_edge
*> redirect_callers
,
1036 const char *suffix
= NULL
);
1038 /* Perform function versioning.
1039 Function versioning includes copying of the tree and
1040 a callgraph update (creating a new cgraph node and updating
1041 its callees and callers).
1043 REDIRECT_CALLERS varray includes the edges to be redirected
1046 TREE_MAP is a mapping of tree nodes we want to replace with
1047 new ones (according to results of prior analysis).
1049 If non-NULL ARGS_TO_SKIP determine function parameters to remove
1051 If SKIP_RETURN is true, the new version will return void.
1052 If non-NULL BLOCK_TO_COPY determine what basic blocks to copy.
1053 If non_NULL NEW_ENTRY determine new entry BB of the clone.
1055 If TARGET_ATTRIBUTES is non-null, when creating a new declaration,
1056 add the attributes to DECL_ATTRIBUTES. And call valid_attribute_p
1057 that will promote value of the attribute DECL_FUNCTION_SPECIFIC_TARGET
1060 Return the new version's cgraph node. */
1061 cgraph_node
*create_version_clone_with_body
1062 (vec
<cgraph_edge
*> redirect_callers
,
1063 vec
<ipa_replace_map
*, va_gc
> *tree_map
,
1064 ipa_param_adjustments
*param_adjustments
,
1065 bitmap bbs_to_copy
, basic_block new_entry_block
, const char *clone_name
,
1066 tree target_attributes
= NULL_TREE
);
1068 /* Insert a new cgraph_function_version_info node into cgraph_fnver_htab
1069 corresponding to cgraph_node. */
1070 cgraph_function_version_info
*insert_new_function_version (void);
1072 /* Get the cgraph_function_version_info node corresponding to node. */
1073 cgraph_function_version_info
*function_version (void);
1075 /* Discover all functions and variables that are trivially needed, analyze
1076 them as well as all functions and variables referred by them */
1077 void analyze (void);
1079 /* Add thunk alias into callgraph. The alias declaration is ALIAS and it
1080 aliases DECL with an adjustments made into the first parameter.
1081 See comments in struct cgraph_thunk_info for detail on the parameters. */
1082 cgraph_node
* create_thunk (tree alias
, tree
, bool this_adjusting
,
1083 HOST_WIDE_INT fixed_offset
,
1084 HOST_WIDE_INT virtual_value
,
1085 HOST_WIDE_INT indirect_offset
,
1086 tree virtual_offset
,
1090 /* Return node that alias is aliasing. */
1091 inline cgraph_node
*get_alias_target (void);
1093 /* Given function symbol, walk the alias chain to return the function node
1094 is alias of. Do not walk through thunks.
1095 When AVAILABILITY is non-NULL, get minimal availability in the chain.
1096 When REF is non-NULL, assume that reference happens in symbol REF
1097 when determining the availability. */
1099 cgraph_node
*ultimate_alias_target (availability
*availability
= NULL
,
1100 symtab_node
*ref
= NULL
);
1102 /* Expand thunk NODE to gimple if possible.
1103 When FORCE_GIMPLE_THUNK is true, gimple thunk is created and
1104 no assembler is produced.
1105 When OUTPUT_ASM_THUNK is true, also produce assembler for
1106 thunks that are not lowered. */
1107 bool expand_thunk (bool output_asm_thunks
, bool force_gimple_thunk
);
1109 /* Call expand_thunk on all callers that are thunks and analyze those
1110 nodes that were expanded. */
1111 void expand_all_artificial_thunks ();
1113 /* Assemble thunks and aliases associated to node. */
1114 void assemble_thunks_and_aliases (void);
1116 /* Expand function specified by node. */
1119 /* As an GCC extension we allow redefinition of the function. The
1120 semantics when both copies of bodies differ is not well defined.
1121 We replace the old body with new body so in unit at a time mode
1122 we always use new body, while in normal mode we may end up with
1123 old body inlined into some functions and new body expanded and
1124 inlined in others. */
1127 /* Creates a wrapper from cgraph_node to TARGET node. Thunk is used for this
1128 kind of wrapper method. */
1129 void create_wrapper (cgraph_node
*target
);
1131 /* Verify cgraph nodes of the cgraph node. */
1132 void DEBUG_FUNCTION
verify_node (void);
1134 /* Remove function from symbol table. */
1137 /* Dump call graph node to file F. */
1138 void dump (FILE *f
);
1140 /* Dump call graph node to file F. */
1141 void dump_graphviz (FILE *f
);
1143 /* Dump call graph node to stderr. */
1144 void DEBUG_FUNCTION
debug (void);
1146 /* When doing LTO, read cgraph_node's body from disk if it is not already
1148 bool get_untransformed_body (void);
1150 /* Prepare function body. When doing LTO, read cgraph_node's body from disk
1151 if it is not already present. When some IPA transformations are scheduled,
1153 bool get_body (void);
1155 /* Release memory used to represent body of function.
1156 Use this only for functions that are released before being translated to
1157 target code (i.e. RTL). Functions that are compiled to RTL and beyond
1158 are free'd in final.c via free_after_compilation(). */
1159 void release_body (bool keep_arguments
= false);
1161 /* Return the DECL_STRUCT_FUNCTION of the function. */
1162 struct function
*get_fun () const;
1164 /* Bring cgraph node local. */
1165 void make_local (void);
1167 /* Likewise indicate that a node is having address taken. */
1168 void mark_address_taken (void);
1170 /* Set finalization priority to PRIORITY. */
1171 void set_fini_priority (priority_type priority
);
1173 /* Return the finalization priority. */
1174 priority_type
get_fini_priority (void);
1176 /* Create edge from a given function to CALLEE in the cgraph. */
1177 cgraph_edge
*create_edge (cgraph_node
*callee
,
1178 gcall
*call_stmt
, profile_count count
,
1179 bool cloning_p
= false);
1181 /* Create an indirect edge with a yet-undetermined callee where the call
1182 statement destination is a formal parameter of the caller with index
1184 cgraph_edge
*create_indirect_edge (gcall
*call_stmt
, int ecf_flags
,
1185 profile_count count
,
1186 bool cloning_p
= false);
1188 /* Like cgraph_create_edge walk the clone tree and update all clones sharing
1189 same function body. If clones already have edge for OLD_STMT; only
1190 update the edge same way as cgraph_set_call_stmt_including_clones does. */
1191 void create_edge_including_clones (cgraph_node
*callee
,
1192 gimple
*old_stmt
, gcall
*stmt
,
1193 profile_count count
,
1194 cgraph_inline_failed_t reason
);
1196 /* Return the callgraph edge representing the GIMPLE_CALL statement
1198 cgraph_edge
*get_edge (gimple
*call_stmt
);
1200 /* Collect all callers of cgraph_node and its aliases that are known to lead
1201 to NODE (i.e. are not overwritable) and that are not thunks. */
1202 vec
<cgraph_edge
*> collect_callers (void);
1204 /* Remove all callers from the node. */
1205 void remove_callers (void);
1207 /* Remove all callees from the node. */
1208 void remove_callees (void);
1210 /* Return function availability. See cgraph.h for description of individual
1212 enum availability
get_availability (symtab_node
*ref
= NULL
);
1214 /* Set TREE_NOTHROW on cgraph_node's decl and on aliases of the node
1215 if any to NOTHROW. */
1216 bool set_nothrow_flag (bool nothrow
);
1218 /* SET DECL_IS_MALLOC on cgraph_node's decl and on aliases of the node
1220 bool set_malloc_flag (bool malloc_p
);
1222 /* If SET_CONST is true, mark function, aliases and thunks to be ECF_CONST.
1223 If SET_CONST if false, clear the flag.
1225 When setting the flag be careful about possible interposition and
1226 do not set the flag for functions that can be interposed and set pure
1227 flag for functions that can bind to other definition.
1229 Return true if any change was done. */
1231 bool set_const_flag (bool set_const
, bool looping
);
1233 /* Set DECL_PURE_P on cgraph_node's decl and on aliases of the node
1236 When setting the flag, be careful about possible interposition.
1237 Return true if any change was done. */
1239 bool set_pure_flag (bool pure
, bool looping
);
1241 /* Call callback on function and aliases associated to the function.
1242 When INCLUDE_OVERWRITABLE is false, overwritable aliases and thunks are
1245 bool call_for_symbol_and_aliases (bool (*callback
) (cgraph_node
*,
1247 void *data
, bool include_overwritable
);
1249 /* Call callback on cgraph_node, thunks and aliases associated to NODE.
1250 When INCLUDE_OVERWRITABLE is false, overwritable aliases and thunks are
1251 skipped. When EXCLUDE_VIRTUAL_THUNKS is true, virtual thunks are
1253 bool call_for_symbol_thunks_and_aliases (bool (*callback
) (cgraph_node
*node
,
1256 bool include_overwritable
,
1257 bool exclude_virtual_thunks
= false);
1259 /* Likewise indicate that a node is needed, i.e. reachable via some
1261 inline void mark_force_output (void);
1263 /* Return true when function can be marked local. */
1264 bool local_p (void);
1266 /* Return true if cgraph_node can be made local for API change.
1267 Extern inline functions and C++ COMDAT functions can be made local
1268 at the expense of possible code size growth if function is used in multiple
1269 compilation units. */
1270 bool can_be_local_p (void);
1272 /* Return true when cgraph_node cannot return or throw and thus
1273 it is safe to ignore its side effects for IPA analysis. */
1274 bool cannot_return_p (void);
1276 /* Return true when function cgraph_node and all its aliases are only called
1278 i.e. it is not externally visible, address was not taken and
1279 it is not used in any other non-standard way. */
1280 bool only_called_directly_p (void);
1282 /* Return true when function is only called directly or it has alias.
1283 i.e. it is not externally visible, address was not taken and
1284 it is not used in any other non-standard way. */
1285 inline bool only_called_directly_or_aliased_p (void);
1287 /* Return true when function cgraph_node can be expected to be removed
1288 from program when direct calls in this compilation unit are removed.
1290 As a special case COMDAT functions are
1291 cgraph_can_remove_if_no_direct_calls_p while the are not
1292 cgraph_only_called_directly_p (it is possible they are called from other
1295 This function behaves as cgraph_only_called_directly_p because eliminating
1296 all uses of COMDAT function does not make it necessarily disappear from
1297 the program unless we are compiling whole program or we do LTO. In this
1298 case we know we win since dynamic linking will not really discard the
1301 If WILL_INLINE is true, assume that function will be inlined into all the
1303 bool will_be_removed_from_program_if_no_direct_calls_p
1304 (bool will_inline
= false);
1306 /* Return true when function can be removed from callgraph
1307 if all direct calls and references are eliminated. The function does
1308 not take into account comdat groups. */
1309 bool can_remove_if_no_direct_calls_and_refs_p (void);
1311 /* Return true when function cgraph_node and its aliases can be removed from
1312 callgraph if all direct calls are eliminated.
1313 If WILL_INLINE is true, assume that function will be inlined into all the
1315 bool can_remove_if_no_direct_calls_p (bool will_inline
= false);
1317 /* Return true when callgraph node is a function with Gimple body defined
1318 in current unit. Functions can also be define externally or they
1319 can be thunks with no Gimple representation.
1321 Note that at WPA stage, the function body may not be present in memory. */
1322 inline bool has_gimple_body_p (void);
1324 /* Return true if this node represents a former, i.e. an expanded, thunk. */
1325 inline bool former_thunk_p (void);
1327 /* Check if function calls comdat local. This is used to recompute
1328 calls_comdat_local flag after function transformations. */
1329 bool check_calls_comdat_local_p ();
1331 /* Return true if function should be optimized for size. */
1332 bool optimize_for_size_p (void);
1334 /* Dump the callgraph to file F. */
1335 static void dump_cgraph (FILE *f
);
1337 /* Dump the call graph to stderr. */
1339 void debug_cgraph (void)
1341 dump_cgraph (stderr
);
1344 /* Get unique identifier of the node. */
1345 inline int get_uid ()
1350 /* Get summary id of the node. */
1351 inline int get_summary_id ()
1353 return m_summary_id
;
1356 /* Record that DECL1 and DECL2 are semantically identical function
1358 static void record_function_versions (tree decl1
, tree decl2
);
1360 /* Remove the cgraph_function_version_info and cgraph_node for DECL. This
1361 DECL is a duplicate declaration. */
1362 static void delete_function_version_by_decl (tree decl
);
1364 /* Add the function FNDECL to the call graph.
1365 Unlike finalize_function, this function is intended to be used
1366 by middle end and allows insertion of new function at arbitrary point
1367 of compilation. The function can be either in high, low or SSA form
1370 The function is assumed to be reachable and have address taken (so no
1371 API breaking optimizations are performed on it).
1373 Main work done by this function is to enqueue the function for later
1374 processing to avoid need the passes to be re-entrant. */
1375 static void add_new_function (tree fndecl
, bool lowered
);
1377 /* Return callgraph node for given symbol and check it is a function. */
1378 static inline cgraph_node
*get (const_tree decl
)
1380 gcc_checking_assert (TREE_CODE (decl
) == FUNCTION_DECL
);
1381 return dyn_cast
<cgraph_node
*> (symtab_node::get (decl
));
1384 /* DECL has been parsed. Take it, queue it, compile it at the whim of the
1385 logic in effect. If NO_COLLECT is true, then our caller cannot stand to
1386 have the garbage collector run at the moment. We would need to either
1387 create a new GC context, or just not compile right now. */
1388 static void finalize_function (tree
, bool);
1390 /* Return cgraph node assigned to DECL. Create new one when needed. */
1391 static cgraph_node
* create (tree decl
);
1393 /* Try to find a call graph node for declaration DECL and if it does not
1394 exist or if it corresponds to an inline clone, create a new one. */
1395 static cgraph_node
* get_create (tree
);
1397 /* Return local info for the compiled function. */
1398 static cgraph_node
*local_info_node (tree decl
);
1400 /* Return RTL info for the compiled function. */
1401 static struct cgraph_rtl_info
*rtl_info (const_tree
);
1403 /* Return the cgraph node that has ASMNAME for its DECL_ASSEMBLER_NAME.
1404 Return NULL if there's no such node. */
1405 static cgraph_node
*get_for_asmname (tree asmname
);
1407 /* Attempt to mark ALIAS as an alias to DECL. Return alias node if
1408 successful and NULL otherwise.
1409 Same body aliases are output whenever the body of DECL is output,
1410 and cgraph_node::get (ALIAS) transparently
1411 returns cgraph_node::get (DECL). */
1412 static cgraph_node
* create_same_body_alias (tree alias
, tree decl
);
1414 /* Verify whole cgraph structure. */
1415 static void DEBUG_FUNCTION
verify_cgraph_nodes (void);
1417 /* Verify cgraph, if consistency checking is enabled. */
1418 static inline void checking_verify_cgraph_nodes (void);
1420 /* Worker to bring NODE local. */
1421 static bool make_local (cgraph_node
*node
, void *);
1423 /* Mark ALIAS as an alias to DECL. DECL_NODE is cgraph node representing
1424 the function body is associated
1425 with (not necessarily cgraph_node (DECL). */
1426 static cgraph_node
*create_alias (tree alias
, tree target
);
1428 /* Return true if NODE has thunk. */
1429 static bool has_thunk_p (cgraph_node
*node
, void *);
1431 cgraph_edge
*callees
;
1432 cgraph_edge
*callers
;
1433 /* List of edges representing indirect calls with a yet undetermined
1435 cgraph_edge
*indirect_calls
;
1436 cgraph_node
*next_sibling_clone
;
1437 cgraph_node
*prev_sibling_clone
;
1438 cgraph_node
*clones
;
1439 cgraph_node
*clone_of
;
1440 /* For functions with many calls sites it holds map from call expression
1441 to the edge to speed up cgraph_edge function. */
1442 hash_table
<cgraph_edge_hasher
> *GTY(()) call_site_hash
;
1443 /* Declaration node used to be clone of. */
1444 tree former_clone_of
;
1446 /* If this is a SIMD clone, this points to the SIMD specific
1447 information for it. */
1448 cgraph_simd_clone
*simdclone
;
1449 /* If this function has SIMD clones, this points to the first clone. */
1450 cgraph_node
*simd_clones
;
1452 /* Interprocedural passes scheduled to have their transform functions
1453 applied next time we execute local pass on them. We maintain it
1454 per-function in order to allow IPA passes to introduce new functions. */
1455 vec
<ipa_opt_pass
> GTY((skip
)) ipa_transforms_to_apply
;
1457 /* For inline clones this points to the function they will be
1459 cgraph_node
*inlined_to
;
1461 struct cgraph_rtl_info
*rtl
;
1462 cgraph_clone_info clone
;
1463 cgraph_thunk_info thunk
;
1465 /* Expected number of executions: calculated in profile.c. */
1466 profile_count count
;
1467 /* How to scale counts at materialization time; used to merge
1468 LTO units with different number of profile runs. */
1469 int count_materialization_scale
;
1470 /* ID assigned by the profiling. */
1471 unsigned int profile_id
;
1472 /* ID of the translation unit. */
1474 /* Time profiler: first run of function. */
1477 /* Set when decl is an abstract function pointed to by the
1478 ABSTRACT_DECL_ORIGIN of a reachable function. */
1479 unsigned used_as_abstract_origin
: 1;
1480 /* Set once the function is lowered (i.e. its CFG is built). */
1481 unsigned lowered
: 1;
1482 /* Set once the function has been instantiated and its callee
1484 unsigned process
: 1;
1485 /* How commonly executed the node is. Initialized during branch
1486 probabilities pass. */
1487 ENUM_BITFIELD (node_frequency
) frequency
: 2;
1488 /* True when function can only be called at startup (from static ctor). */
1489 unsigned only_called_at_startup
: 1;
1490 /* True when function can only be called at startup (from static dtor). */
1491 unsigned only_called_at_exit
: 1;
1492 /* True when function is the transactional clone of a function which
1493 is called only from inside transactions. */
1494 /* ?? We should be able to remove this. We have enough bits in
1495 cgraph to calculate it. */
1496 unsigned tm_clone
: 1;
1497 /* True if this decl is a dispatcher for function versions. */
1498 unsigned dispatcher_function
: 1;
1499 /* True if this decl calls a COMDAT-local function. This is set up in
1500 compute_fn_summary and inline_call. */
1501 unsigned calls_comdat_local
: 1;
1502 /* True if node has been created by merge operation in IPA-ICF. */
1503 unsigned icf_merged
: 1;
1504 /* True if call to node can't result in a call to free, munmap or
1505 other operation that could make previously non-trapping memory
1506 accesses trapping. */
1507 unsigned nonfreeing_fn
: 1;
1508 /* True if there was multiple COMDAT bodies merged by lto-symtab. */
1509 unsigned merged_comdat
: 1;
1510 /* True if this def was merged with extern inlines. */
1511 unsigned merged_extern_inline
: 1;
1512 /* True if function was created to be executed in parallel. */
1513 unsigned parallelized_function
: 1;
1514 /* True if function is part split out by ipa-split. */
1515 unsigned split_part
: 1;
1516 /* True if the function appears as possible target of indirect call. */
1517 unsigned indirect_call_target
: 1;
1518 /* Set when function is visible in current compilation unit only and
1519 its address is never taken. */
1521 /* False when there is something makes versioning impossible. */
1522 unsigned versionable
: 1;
1523 /* False when function calling convention and signature cannot be changed.
1524 This is the case when __builtin_apply_args is used. */
1525 unsigned can_change_signature
: 1;
1526 /* True when the function has been originally extern inline, but it is
1528 unsigned redefined_extern_inline
: 1;
1529 /* True if the function may enter serial irrevocable mode. */
1530 unsigned tm_may_enter_irr
: 1;
1531 /* True if this was a clone created by ipa-cp. */
1532 unsigned ipcp_clone
: 1;
1533 /* True if this is the deferred declare variant resolution artificial
1535 unsigned declare_variant_alt
: 1;
1536 /* True if the function calls declare_variant_alt functions. */
1537 unsigned calls_declare_variant_alt
: 1;
1540 /* Unique id of the node. */
1543 /* Summary id that is recycled. */
1546 /* Worker for call_for_symbol_and_aliases. */
1547 bool call_for_symbol_and_aliases_1 (bool (*callback
) (cgraph_node
*,
1549 void *data
, bool include_overwritable
);
1552 /* A cgraph node set is a collection of cgraph nodes. A cgraph node
1553 can appear in multiple sets. */
1554 struct cgraph_node_set_def
1556 hash_map
<cgraph_node
*, size_t> *map
;
1557 vec
<cgraph_node
*> nodes
;
1560 typedef cgraph_node_set_def
*cgraph_node_set
;
1561 typedef struct varpool_node_set_def
*varpool_node_set
;
1563 struct varpool_node
;
1565 /* A varpool node set is a collection of varpool nodes. A varpool node
1566 can appear in multiple sets. */
1567 struct varpool_node_set_def
1569 hash_map
<varpool_node
*, size_t> * map
;
1570 vec
<varpool_node
*> nodes
;
1573 /* Iterator structure for cgraph node sets. */
1574 struct cgraph_node_set_iterator
1576 cgraph_node_set set
;
1580 /* Iterator structure for varpool node sets. */
1581 struct varpool_node_set_iterator
1583 varpool_node_set set
;
1587 /* Context of polymorphic call. It represent information about the type of
1588 instance that may reach the call. This is used by ipa-devirt walkers of the
1589 type inheritance graph. */
1591 class GTY(()) ipa_polymorphic_call_context
{
1593 /* The called object appears in an object of type OUTER_TYPE
1594 at offset OFFSET. When information is not 100% reliable, we
1595 use SPECULATIVE_OUTER_TYPE and SPECULATIVE_OFFSET. */
1596 HOST_WIDE_INT offset
;
1597 HOST_WIDE_INT speculative_offset
;
1599 tree speculative_outer_type
;
1600 /* True if outer object may be in construction or destruction. */
1601 unsigned maybe_in_construction
: 1;
1602 /* True if outer object may be of derived type. */
1603 unsigned maybe_derived_type
: 1;
1604 /* True if speculative outer object may be of derived type. We always
1605 speculate that construction does not happen. */
1606 unsigned speculative_maybe_derived_type
: 1;
1607 /* True if the context is invalid and all calls should be redirected
1608 to BUILTIN_UNREACHABLE. */
1609 unsigned invalid
: 1;
1610 /* True if the outer type is dynamic. */
1611 unsigned dynamic
: 1;
1613 /* Build empty "I know nothing" context. */
1614 ipa_polymorphic_call_context ();
1615 /* Build polymorphic call context for indirect call E. */
1616 ipa_polymorphic_call_context (cgraph_edge
*e
);
1617 /* Build polymorphic call context for IP invariant CST.
1618 If specified, OTR_TYPE specify the type of polymorphic call
1619 that takes CST+OFFSET as a parameter. */
1620 ipa_polymorphic_call_context (tree cst
, tree otr_type
= NULL
,
1621 HOST_WIDE_INT offset
= 0);
1622 /* Build context for pointer REF contained in FNDECL at statement STMT.
1623 if INSTANCE is non-NULL, return pointer to the object described by
1625 ipa_polymorphic_call_context (tree fndecl
, tree ref
, gimple
*stmt
,
1626 tree
*instance
= NULL
);
1628 /* Look for vtable stores or constructor calls to work out dynamic type
1629 of memory location. */
1630 bool get_dynamic_type (tree
, tree
, tree
, gimple
*, unsigned *);
1632 /* Make context non-speculative. */
1633 void clear_speculation ();
1635 /* Produce context specifying all derived types of OTR_TYPE. If OTR_TYPE is
1636 NULL, the context is set to dummy "I know nothing" setting. */
1637 void clear_outer_type (tree otr_type
= NULL
);
1639 /* Walk container types and modify context to point to actual class
1640 containing OTR_TYPE (if non-NULL) as base class.
1641 Return true if resulting context is valid.
1643 When CONSIDER_PLACEMENT_NEW is false, reject contexts that may be made
1644 valid only via allocation of new polymorphic type inside by means
1647 When CONSIDER_BASES is false, only look for actual fields, not base types
1649 bool restrict_to_inner_class (tree otr_type
,
1650 bool consider_placement_new
= true,
1651 bool consider_bases
= true);
1653 /* Adjust all offsets in contexts by given number of bits. */
1654 void offset_by (HOST_WIDE_INT
);
1655 /* Use when we cannot track dynamic type change. This speculatively assume
1656 type change is not happening. */
1657 void possible_dynamic_type_change (bool, tree otr_type
= NULL
);
1658 /* Assume that both THIS and a given context is valid and strengthen THIS
1659 if possible. Return true if any strengthening was made.
1660 If actual type the context is being used in is known, OTR_TYPE should be
1661 set accordingly. This improves quality of combined result. */
1662 bool combine_with (ipa_polymorphic_call_context
, tree otr_type
= NULL
);
1663 bool meet_with (ipa_polymorphic_call_context
, tree otr_type
= NULL
);
1665 /* Return TRUE if context is fully useless. */
1666 bool useless_p () const;
1667 /* Return TRUE if this context conveys the same information as X. */
1668 bool equal_to (const ipa_polymorphic_call_context
&x
) const;
1670 /* Dump human readable context to F. If NEWLINE is true, it will be
1671 terminated by a newline. */
1672 void dump (FILE *f
, bool newline
= true) const;
1673 void DEBUG_FUNCTION
debug () const;
1675 /* LTO streaming. */
1676 void stream_out (struct output_block
*) const;
1677 void stream_in (class lto_input_block
*, class data_in
*data_in
);
1680 bool combine_speculation_with (tree
, HOST_WIDE_INT
, bool, tree
);
1681 bool meet_speculation_with (tree
, HOST_WIDE_INT
, bool, tree
);
1682 void set_by_decl (tree
, HOST_WIDE_INT
);
1683 bool set_by_invariant (tree
, tree
, HOST_WIDE_INT
);
1684 bool speculation_consistent_p (tree
, HOST_WIDE_INT
, bool, tree
) const;
1685 void make_speculative (tree otr_type
= NULL
);
1688 /* Structure containing additional information about an indirect call. */
1690 class GTY(()) cgraph_indirect_call_info
1693 /* When agg_content is set, an offset where the call pointer is located
1694 within the aggregate. */
1695 HOST_WIDE_INT offset
;
1696 /* Context of the polymorphic call; use only when POLYMORPHIC flag is set. */
1697 ipa_polymorphic_call_context context
;
1698 /* OBJ_TYPE_REF_TOKEN of a polymorphic call (if polymorphic is set). */
1699 HOST_WIDE_INT otr_token
;
1700 /* Type of the object from OBJ_TYPE_REF_OBJECT. */
1702 /* Index of the parameter that is called. */
1704 /* ECF flags determined from the caller. */
1707 /* Number of speculative call targets, it's less than GCOV_TOPN_VALUES. */
1708 unsigned num_speculative_call_targets
: 16;
1710 /* Set when the call is a virtual call with the parameter being the
1711 associated object pointer rather than a simple direct call. */
1712 unsigned polymorphic
: 1;
1713 /* Set when the call is a call of a pointer loaded from contents of an
1714 aggregate at offset. */
1715 unsigned agg_contents
: 1;
1716 /* Set when this is a call through a member pointer. */
1717 unsigned member_ptr
: 1;
1718 /* When the agg_contents bit is set, this one determines whether the
1719 destination is loaded from a parameter passed by reference. */
1720 unsigned by_ref
: 1;
1721 /* When the agg_contents bit is set, this one determines whether we can
1722 deduce from the function body that the loaded value from the reference is
1723 never modified between the invocation of the function and the load
1725 unsigned guaranteed_unmodified
: 1;
1726 /* For polymorphic calls this specify whether the virtual table pointer
1727 may have changed in between function entry and the call. */
1728 unsigned vptr_changed
: 1;
1731 class GTY((chain_next ("%h.next_caller"), chain_prev ("%h.prev_caller"),
1732 for_user
)) cgraph_edge
1735 friend struct cgraph_node
;
1736 friend class symbol_table
;
1738 /* Remove EDGE from the cgraph. */
1739 static void remove (cgraph_edge
*edge
);
1741 /* Change field call_stmt of edge E to NEW_STMT. If UPDATE_SPECULATIVE and E
1742 is any component of speculative edge, then update all components.
1743 Speculations can be resolved in the process and EDGE can be removed and
1744 deallocated. Return the edge that now represents the call. */
1745 static cgraph_edge
*set_call_stmt (cgraph_edge
*e
, gcall
*new_stmt
,
1746 bool update_speculative
= true);
1748 /* Redirect callee of the edge to N. The function does not update underlying
1750 void redirect_callee (cgraph_node
*n
);
1752 /* If the edge does not lead to a thunk, simply redirect it to N. Otherwise
1753 create one or more equivalent thunks for N and redirect E to the first in
1754 the chain. Note that it is then necessary to call
1755 n->expand_all_artificial_thunks once all callers are redirected. */
1756 void redirect_callee_duplicating_thunks (cgraph_node
*n
);
1758 /* Make an indirect edge with an unknown callee an ordinary edge leading to
1759 CALLEE. Speculations can be resolved in the process and EDGE can be
1760 removed and deallocated. Return the edge that now represents the
1762 static cgraph_edge
*make_direct (cgraph_edge
*edge
, cgraph_node
*callee
);
1764 /* Turn edge into speculative call calling N2. Update
1765 the profile so the direct call is taken COUNT times
1766 with FREQUENCY. speculative_id is used to link direct calls with their
1767 corresponding IPA_REF_ADDR references when representing speculative calls.
1769 cgraph_edge
*make_speculative (cgraph_node
*n2
, profile_count direct_count
,
1770 unsigned int speculative_id
= 0);
1772 /* Speculative call consists of an indirect edge and one or more
1773 direct edge+ref pairs. Speculative will expand to the following sequence:
1775 if (call_dest == target1) // reference to target1
1776 target1 (); // direct call to target1
1777 else if (call_dest == target2) // reference to targt2
1778 target2 (); // direct call to target2
1780 call_dest (); // indirect call
1782 Before the expansion we will have indirect call and the direct call+ref
1783 pairs all linked to single statement.
1785 Note that ref may point to different symbol than the corresponding call
1786 becuase the speculated edge may have been optimized (redirected to
1787 a clone) or inlined.
1789 Given an edge which is part of speculative call, return the first
1790 direct call edge in the speculative call sequence.
1792 In the example above called on any cgraph edge in the sequence it will
1793 return direct call to target1. */
1794 cgraph_edge
*first_speculative_call_target ();
1796 /* Return next speculative call target or NULL if there is none.
1797 All targets are required to form an interval in the callee list.
1799 In example above, if called on call to target1 it will return call to
1801 cgraph_edge
*next_speculative_call_target ()
1803 cgraph_edge
*e
= this;
1804 gcc_checking_assert (speculative
&& callee
);
1806 if (e
->next_callee
&& e
->next_callee
->speculative
1807 && e
->next_callee
->call_stmt
== e
->call_stmt
1808 && e
->next_callee
->lto_stmt_uid
== e
->lto_stmt_uid
)
1809 return e
->next_callee
;
1813 /* When called on any edge in the speculative call return the (unique)
1814 indirect call edge in the speculative call sequence. */
1815 cgraph_edge
*speculative_call_indirect_edge ()
1817 gcc_checking_assert (speculative
);
1820 for (cgraph_edge
*e2
= caller
->indirect_calls
;
1821 true; e2
= e2
->next_callee
)
1823 && call_stmt
== e2
->call_stmt
1824 && lto_stmt_uid
== e2
->lto_stmt_uid
)
1828 /* When called on any edge in speculative call and when given any target
1829 of ref which is speculated to it returns the corresponding direct call.
1831 In example above if called on function target2 it will return call to
1833 cgraph_edge
*speculative_call_for_target (cgraph_node
*);
1835 /* Return REF corresponding to direct call in the specualtive call
1837 ipa_ref
*speculative_call_target_ref ()
1841 gcc_checking_assert (speculative
);
1842 for (unsigned int i
= 0; caller
->iterate_reference (i
, ref
); i
++)
1843 if (ref
->speculative
&& ref
->speculative_id
== speculative_id
1844 && ref
->stmt
== (gimple
*)call_stmt
1845 && ref
->lto_stmt_uid
== lto_stmt_uid
)
1850 /* Speculative call edge turned out to be direct call to CALLEE_DECL. Remove
1851 the speculative call sequence and return edge representing the call, the
1852 original EDGE can be removed and deallocated. It is up to caller to
1853 redirect the call as appropriate. Return the edge that now represents the
1856 For "speculative" indirect call that contains multiple "speculative"
1857 targets (i.e. edge->indirect_info->num_speculative_call_targets > 1),
1858 decrease the count and only remove current direct edge.
1860 If no speculative direct call left to the speculative indirect call, remove
1861 the speculative of both the indirect call and corresponding direct edge.
1863 It is up to caller to iteratively resolve each "speculative" direct call
1864 and redirect the call as appropriate. */
1865 static cgraph_edge
*resolve_speculation (cgraph_edge
*edge
,
1866 tree callee_decl
= NULL
);
1868 /* If necessary, change the function declaration in the call statement
1869 associated with edge E so that it corresponds to the edge callee.
1870 Speculations can be resolved in the process and EDGE can be removed and
1873 The edge could be one of speculative direct call generated from speculative
1874 indirect call. In this circumstance, decrease the speculative targets
1875 count (i.e. num_speculative_call_targets) and redirect call stmt to the
1876 corresponding i-th target. If no speculative direct call left to the
1877 speculative indirect call, remove "speculative" of the indirect call and
1878 also redirect stmt to it's final direct target.
1880 It is up to caller to iteratively transform each "speculative"
1881 direct call as appropriate. */
1882 static gimple
*redirect_call_stmt_to_callee (cgraph_edge
*e
);
1884 /* Create clone of edge in the node N represented
1885 by CALL_EXPR the callgraph. */
1886 cgraph_edge
* clone (cgraph_node
*n
, gcall
*call_stmt
, unsigned stmt_uid
,
1887 profile_count num
, profile_count den
,
1888 bool update_original
);
1890 /* Verify edge count and frequency. */
1891 bool verify_count ();
1893 /* Return true when call of edge cannot lead to return from caller
1894 and thus it is safe to ignore its side effects for IPA analysis
1895 when computing side effects of the caller. */
1896 bool cannot_lead_to_return_p (void);
1898 /* Return true when the edge represents a direct recursion. */
1899 bool recursive_p (void);
1901 /* Return true if the edge may be considered hot. */
1902 bool maybe_hot_p (void);
1904 /* Get unique identifier of the edge. */
1905 inline int get_uid ()
1910 /* Get summary id of the edge. */
1911 inline int get_summary_id ()
1913 return m_summary_id
;
1916 /* Rebuild cgraph edges for current function node. This needs to be run after
1917 passes that don't update the cgraph. */
1918 static unsigned int rebuild_edges (void);
1920 /* Rebuild cgraph references for current function node. This needs to be run
1921 after passes that don't update the cgraph. */
1922 static void rebuild_references (void);
1924 /* During LTO stream in this can be used to check whether call can possibly
1925 be internal to the current translation unit. */
1926 bool possibly_call_in_translation_unit_p (void);
1928 /* Return num_speculative_targets of this edge. */
1929 int num_speculative_call_targets_p (void);
1931 /* Expected number of executions: calculated in profile.c. */
1932 profile_count count
;
1933 cgraph_node
*caller
;
1934 cgraph_node
*callee
;
1935 cgraph_edge
*prev_caller
;
1936 cgraph_edge
*next_caller
;
1937 cgraph_edge
*prev_callee
;
1938 cgraph_edge
*next_callee
;
1940 /* Additional information about an indirect call. Not cleared when an edge
1942 cgraph_indirect_call_info
*indirect_info
;
1943 PTR
GTY ((skip (""))) aux
;
1944 /* When equal to CIF_OK, inline this call. Otherwise, points to the
1945 explanation why function was not inlined. */
1946 enum cgraph_inline_failed_t inline_failed
;
1947 /* The stmt_uid of call_stmt. This is used by LTO to recover the call_stmt
1948 when the function is serialized in. */
1949 unsigned int lto_stmt_uid
;
1950 /* speculative id is used to link direct calls with their corresponding
1951 IPA_REF_ADDR references when representing speculative calls. */
1952 unsigned int speculative_id
: 16;
1953 /* Whether this edge was made direct by indirect inlining. */
1954 unsigned int indirect_inlining_edge
: 1;
1955 /* Whether this edge describes an indirect call with an undetermined
1957 unsigned int indirect_unknown_callee
: 1;
1958 /* Whether this edge is still a dangling */
1959 /* True if the corresponding CALL stmt cannot be inlined. */
1960 unsigned int call_stmt_cannot_inline_p
: 1;
1961 /* Can this call throw externally? */
1962 unsigned int can_throw_external
: 1;
1963 /* Edges with SPECULATIVE flag represents indirect calls that was
1964 speculatively turned into direct (i.e. by profile feedback).
1965 The final code sequence will have form:
1967 if (call_target == expected_fn)
1972 Every speculative call is represented by three components attached
1973 to a same call statement:
1974 1) a direct call (to expected_fn)
1975 2) an indirect call (to call_target)
1976 3) a IPA_REF_ADDR reference to expected_fn.
1978 Optimizers may later redirect direct call to clone, so 1) and 3)
1979 do not need to necessarily agree with destination. */
1980 unsigned int speculative
: 1;
1981 /* Set to true when caller is a constructor or destructor of polymorphic
1983 unsigned in_polymorphic_cdtor
: 1;
1985 /* Return true if call must bind to current definition. */
1986 bool binds_to_current_def_p ();
1988 /* Expected frequency of executions within the function.
1989 When set to CGRAPH_FREQ_BASE, the edge is expected to be called once
1990 per function call. The range is 0 to CGRAPH_FREQ_MAX. */
1993 /* Expected frequency of executions within the function. */
1994 sreal
sreal_frequency ();
1996 /* Unique id of the edge. */
1999 /* Summary id that is recycled. */
2002 /* Remove the edge from the list of the callers of the callee. */
2003 void remove_caller (void);
2005 /* Remove the edge from the list of the callees of the caller. */
2006 void remove_callee (void);
2008 /* Set callee N of call graph edge and add it to the corresponding set of
2010 void set_callee (cgraph_node
*n
);
2012 /* Output flags of edge to a file F. */
2013 void dump_edge_flags (FILE *f
);
2015 /* Dump edge to stderr. */
2016 void DEBUG_FUNCTION
debug (void);
2018 /* Verify that call graph edge corresponds to DECL from the associated
2019 statement. Return true if the verification should fail. */
2020 bool verify_corresponds_to_fndecl (tree decl
);
2023 #define CGRAPH_FREQ_BASE 1000
2024 #define CGRAPH_FREQ_MAX 100000
2026 /* The varpool data structure.
2027 Each static variable decl has assigned varpool_node. */
2029 struct GTY((tag ("SYMTAB_VARIABLE"))) varpool_node
: public symtab_node
2032 explicit varpool_node ()
2033 : symtab_node (SYMTAB_VARIABLE
), output (0), dynamically_initialized (0),
2034 tls_model (TLS_MODEL_NONE
), used_by_single_function (0)
2037 /* Dump given varpool node to F. */
2038 void dump (FILE *f
);
2040 /* Dump given varpool node to stderr. */
2041 void DEBUG_FUNCTION
debug (void);
2043 /* Remove variable from symbol table. */
2046 /* Remove node initializer when it is no longer needed. */
2047 void remove_initializer (void);
2049 void analyze (void);
2051 /* Return variable availability. */
2052 availability
get_availability (symtab_node
*ref
= NULL
);
2054 /* When doing LTO, read variable's constructor from disk if
2055 it is not already present. */
2056 tree
get_constructor (void);
2058 /* Return true if variable has constructor that can be used for folding. */
2059 bool ctor_useable_for_folding_p (void);
2061 /* For given variable pool node, walk the alias chain to return the function
2062 the variable is alias of. Do not walk through thunks.
2063 When AVAILABILITY is non-NULL, get minimal availability in the chain.
2064 When REF is non-NULL, assume that reference happens in symbol REF
2065 when determining the availability. */
2066 inline varpool_node
*ultimate_alias_target
2067 (availability
*availability
= NULL
, symtab_node
*ref
= NULL
);
2069 /* Return node that alias is aliasing. */
2070 inline varpool_node
*get_alias_target (void);
2072 /* Output one variable, if necessary. Return whether we output it. */
2073 bool assemble_decl (void);
2075 /* For variables in named sections make sure get_variable_section
2076 is called before we switch to those sections. Then section
2077 conflicts between read-only and read-only requiring relocations
2078 sections can be resolved. */
2079 void finalize_named_section_flags (void);
2081 /* Call callback on varpool symbol and aliases associated to varpool symbol.
2082 When INCLUDE_OVERWRITABLE is false, overwritable aliases and thunks are
2084 bool call_for_symbol_and_aliases (bool (*callback
) (varpool_node
*, void *),
2086 bool include_overwritable
);
2088 /* Return true when variable should be considered externally visible. */
2089 bool externally_visible_p (void);
2091 /* Return true when all references to variable must be visible
2093 i.e. if the variable is not externally visible or not used in some magic
2094 way (asm statement or such).
2095 The magic uses are all summarized in force_output flag. */
2096 inline bool all_refs_explicit_p ();
2098 /* Return true when variable can be removed from variable pool
2099 if all direct calls are eliminated. */
2100 inline bool can_remove_if_no_refs_p (void);
2102 /* Add the variable DECL to the varpool.
2103 Unlike finalize_decl function is intended to be used
2104 by middle end and allows insertion of new variable at arbitrary point
2106 static void add (tree decl
);
2108 /* Return varpool node for given symbol and check it is a function. */
2109 static inline varpool_node
*get (const_tree decl
);
2111 /* Mark DECL as finalized. By finalizing the declaration, frontend instruct
2112 the middle end to output the variable to asm file, if needed or externally
2114 static void finalize_decl (tree decl
);
2116 /* Attempt to mark ALIAS as an alias to DECL. Return TRUE if successful.
2117 Extra name aliases are output whenever DECL is output. */
2118 static varpool_node
* create_extra_name_alias (tree alias
, tree decl
);
2120 /* Attempt to mark ALIAS as an alias to DECL. Return TRUE if successful.
2121 Extra name aliases are output whenever DECL is output. */
2122 static varpool_node
* create_alias (tree
, tree
);
2124 /* Dump the variable pool to F. */
2125 static void dump_varpool (FILE *f
);
2127 /* Dump the variable pool to stderr. */
2128 static void DEBUG_FUNCTION
debug_varpool (void);
2130 /* Allocate new callgraph node and insert it into basic data structures. */
2131 static varpool_node
*create_empty (void);
2133 /* Return varpool node assigned to DECL. Create new one when needed. */
2134 static varpool_node
*get_create (tree decl
);
2136 /* Given an assembler name, lookup node. */
2137 static varpool_node
*get_for_asmname (tree asmname
);
2139 /* Set when variable is scheduled to be assembled. */
2140 unsigned output
: 1;
2142 /* Set if the variable is dynamically initialized, except for
2143 function local statics. */
2144 unsigned dynamically_initialized
: 1;
2146 ENUM_BITFIELD(tls_model
) tls_model
: 3;
2148 /* Set if the variable is known to be used by single function only.
2149 This is computed by ipa_single_use pass and used by late optimizations
2150 in places where optimization would be valid for local static variable
2151 if we did not do any inter-procedural code movement. */
2152 unsigned used_by_single_function
: 1;
2155 /* Assemble thunks and aliases associated to varpool node. */
2156 void assemble_aliases (void);
2158 /* Worker for call_for_node_and_aliases. */
2159 bool call_for_symbol_and_aliases_1 (bool (*callback
) (varpool_node
*, void *),
2161 bool include_overwritable
);
2164 /* Every top level asm statement is put into a asm_node. */
2166 struct GTY(()) asm_node
{
2167 /* Next asm node. */
2169 /* String for this asm node. */
2171 /* Ordering of all cgraph nodes. */
2175 /* Report whether or not THIS symtab node is a function, aka cgraph_node. */
2180 is_a_helper
<cgraph_node
*>::test (symtab_node
*p
)
2182 return p
&& p
->type
== SYMTAB_FUNCTION
;
2185 /* Report whether or not THIS symtab node is a variable, aka varpool_node. */
2190 is_a_helper
<varpool_node
*>::test (symtab_node
*p
)
2192 return p
&& p
->type
== SYMTAB_VARIABLE
;
2195 typedef void (*cgraph_edge_hook
)(cgraph_edge
*, void *);
2196 typedef void (*cgraph_node_hook
)(cgraph_node
*, void *);
2197 typedef void (*varpool_node_hook
)(varpool_node
*, void *);
2198 typedef void (*cgraph_2edge_hook
)(cgraph_edge
*, cgraph_edge
*, void *);
2199 typedef void (*cgraph_2node_hook
)(cgraph_node
*, cgraph_node
*, void *);
2201 struct cgraph_edge_hook_list
;
2202 struct cgraph_node_hook_list
;
2203 struct varpool_node_hook_list
;
2204 struct cgraph_2edge_hook_list
;
2205 struct cgraph_2node_hook_list
;
2207 /* Map from a symbol to initialization/finalization priorities. */
2208 struct GTY(()) symbol_priority_map
{
2215 /* Frontend is parsing and finalizing functions. */
2217 /* Callgraph is being constructed. It is safe to add new functions. */
2219 /* Callgraph is being streamed-in at LTO time. */
2221 /* Callgraph is built and early IPA passes are being run. */
2223 /* Callgraph is built and all functions are transformed to SSA form. */
2225 /* All inline decisions are done; it is now possible to remove extern inline
2226 functions and virtual call targets. */
2227 IPA_SSA_AFTER_INLINING
,
2228 /* Functions are now ordered and being passed to RTL expanders. */
2230 /* All cgraph expansion is done. */
2234 struct asmname_hasher
: ggc_ptr_hash
<symtab_node
>
2236 typedef const_tree compare_type
;
2238 static hashval_t
hash (symtab_node
*n
);
2239 static bool equal (symtab_node
*n
, const_tree t
);
2242 class GTY((tag ("SYMTAB"))) symbol_table
2245 friend struct symtab_node
;
2246 friend struct cgraph_node
;
2247 friend struct cgraph_edge
;
2250 cgraph_count (0), cgraph_max_uid (1), cgraph_max_summary_id (0),
2251 edges_count (0), edges_max_uid (1), edges_max_summary_id (0),
2252 cgraph_released_summary_ids (), edge_released_summary_ids (),
2253 nodes (NULL
), asmnodes (NULL
), asm_last_node (NULL
),
2254 order (0), max_unit (0), global_info_ready (false), state (PARSING
),
2255 function_flags_ready (false), cpp_implicit_aliases_done (false),
2256 section_hash (NULL
), assembler_name_hash (NULL
), init_priority_hash (NULL
),
2257 dump_file (NULL
), ipa_clones_dump_file (NULL
), cloned_nodes (),
2258 m_first_edge_removal_hook (NULL
), m_first_cgraph_removal_hook (NULL
),
2259 m_first_edge_duplicated_hook (NULL
), m_first_cgraph_duplicated_hook (NULL
),
2260 m_first_cgraph_insertion_hook (NULL
), m_first_varpool_insertion_hook (NULL
),
2261 m_first_varpool_removal_hook (NULL
)
2265 /* Initialize callgraph dump file. */
2266 void initialize (void);
2268 /* Register a top-level asm statement ASM_STR. */
2269 inline asm_node
*finalize_toplevel_asm (tree asm_str
);
2271 /* Analyze the whole compilation unit once it is parsed completely. */
2272 void finalize_compilation_unit (void);
2274 /* C++ frontend produce same body aliases all over the place, even before PCH
2275 gets streamed out. It relies on us linking the aliases with their function
2276 in order to do the fixups, but ipa-ref is not PCH safe. Consequently we
2277 first produce aliases without links, but once C++ FE is sure it won't
2278 stream PCH we build the links via this function. */
2279 void process_same_body_aliases (void);
2281 /* Perform simple optimizations based on callgraph. */
2282 void compile (void);
2284 /* Process CGRAPH_NEW_FUNCTIONS and perform actions necessary to add these
2285 functions into callgraph in a way so they look like ordinary reachable
2286 functions inserted into callgraph already at construction time. */
2287 void process_new_functions (void);
2289 /* Once all functions from compilation unit are in memory, produce all clones
2290 and update all calls. We might also do this on demand if we don't want to
2291 bring all functions to memory prior compilation, but current WHOPR
2292 implementation does that and it is bit easier to keep everything right
2294 void materialize_all_clones (void);
2296 /* Register a symbol NODE. */
2297 inline void register_symbol (symtab_node
*node
);
2300 clear_asm_symbols (void)
2303 asm_last_node
= NULL
;
2306 /* Perform reachability analysis and reclaim all unreachable nodes. */
2307 bool remove_unreachable_nodes (FILE *file
);
2309 /* Optimization of function bodies might've rendered some variables as
2310 unnecessary so we want to avoid these from being compiled. Re-do
2311 reachability starting from variables that are either externally visible
2312 or was referred from the asm output routines. */
2313 void remove_unreferenced_decls (void);
2315 /* Unregister a symbol NODE. */
2316 inline void unregister (symtab_node
*node
);
2318 /* Allocate new callgraph node and insert it into basic data structures. */
2319 cgraph_node
*create_empty (void);
2321 /* Release a callgraph NODE. */
2322 void release_symbol (cgraph_node
*node
);
2324 /* Output all variables enqueued to be assembled. */
2325 bool output_variables (void);
2327 /* Weakrefs may be associated to external decls and thus not output
2328 at expansion time. Emit all necessary aliases. */
2329 void output_weakrefs (void);
2331 /* Return first static symbol with definition. */
2332 inline symtab_node
*first_symbol (void);
2334 /* Return first assembler symbol. */
2336 first_asm_symbol (void)
2341 /* Return first static symbol with definition. */
2342 inline symtab_node
*first_defined_symbol (void);
2344 /* Return first variable. */
2345 inline varpool_node
*first_variable (void);
2347 /* Return next variable after NODE. */
2348 inline varpool_node
*next_variable (varpool_node
*node
);
2350 /* Return first static variable with initializer. */
2351 inline varpool_node
*first_static_initializer (void);
2353 /* Return next static variable with initializer after NODE. */
2354 inline varpool_node
*next_static_initializer (varpool_node
*node
);
2356 /* Return first static variable with definition. */
2357 inline varpool_node
*first_defined_variable (void);
2359 /* Return next static variable with definition after NODE. */
2360 inline varpool_node
*next_defined_variable (varpool_node
*node
);
2362 /* Return first function with body defined. */
2363 inline cgraph_node
*first_defined_function (void);
2365 /* Return next function with body defined after NODE. */
2366 inline cgraph_node
*next_defined_function (cgraph_node
*node
);
2368 /* Return first function. */
2369 inline cgraph_node
*first_function (void);
2371 /* Return next function. */
2372 inline cgraph_node
*next_function (cgraph_node
*node
);
2374 /* Return first function with body defined. */
2375 cgraph_node
*first_function_with_gimple_body (void);
2377 /* Return next reachable static variable with initializer after NODE. */
2378 inline cgraph_node
*next_function_with_gimple_body (cgraph_node
*node
);
2380 /* Register HOOK to be called with DATA on each removed edge. */
2381 cgraph_edge_hook_list
*add_edge_removal_hook (cgraph_edge_hook hook
,
2384 /* Remove ENTRY from the list of hooks called on removing edges. */
2385 void remove_edge_removal_hook (cgraph_edge_hook_list
*entry
);
2387 /* Register HOOK to be called with DATA on each removed node. */
2388 cgraph_node_hook_list
*add_cgraph_removal_hook (cgraph_node_hook hook
,
2391 /* Remove ENTRY from the list of hooks called on removing nodes. */
2392 void remove_cgraph_removal_hook (cgraph_node_hook_list
*entry
);
2394 /* Register HOOK to be called with DATA on each removed node. */
2395 varpool_node_hook_list
*add_varpool_removal_hook (varpool_node_hook hook
,
2398 /* Remove ENTRY from the list of hooks called on removing nodes. */
2399 void remove_varpool_removal_hook (varpool_node_hook_list
*entry
);
2401 /* Register HOOK to be called with DATA on each inserted node. */
2402 cgraph_node_hook_list
*add_cgraph_insertion_hook (cgraph_node_hook hook
,
2405 /* Remove ENTRY from the list of hooks called on inserted nodes. */
2406 void remove_cgraph_insertion_hook (cgraph_node_hook_list
*entry
);
2408 /* Register HOOK to be called with DATA on each inserted node. */
2409 varpool_node_hook_list
*add_varpool_insertion_hook (varpool_node_hook hook
,
2412 /* Remove ENTRY from the list of hooks called on inserted nodes. */
2413 void remove_varpool_insertion_hook (varpool_node_hook_list
*entry
);
2415 /* Register HOOK to be called with DATA on each duplicated edge. */
2416 cgraph_2edge_hook_list
*add_edge_duplication_hook (cgraph_2edge_hook hook
,
2418 /* Remove ENTRY from the list of hooks called on duplicating edges. */
2419 void remove_edge_duplication_hook (cgraph_2edge_hook_list
*entry
);
2421 /* Register HOOK to be called with DATA on each duplicated node. */
2422 cgraph_2node_hook_list
*add_cgraph_duplication_hook (cgraph_2node_hook hook
,
2425 /* Remove ENTRY from the list of hooks called on duplicating nodes. */
2426 void remove_cgraph_duplication_hook (cgraph_2node_hook_list
*entry
);
2428 /* Call all edge removal hooks. */
2429 void call_edge_removal_hooks (cgraph_edge
*e
);
2431 /* Call all node insertion hooks. */
2432 void call_cgraph_insertion_hooks (cgraph_node
*node
);
2434 /* Call all node removal hooks. */
2435 void call_cgraph_removal_hooks (cgraph_node
*node
);
2437 /* Call all node duplication hooks. */
2438 void call_cgraph_duplication_hooks (cgraph_node
*node
, cgraph_node
*node2
);
2440 /* Call all edge duplication hooks. */
2441 void call_edge_duplication_hooks (cgraph_edge
*cs1
, cgraph_edge
*cs2
);
2443 /* Call all node removal hooks. */
2444 void call_varpool_removal_hooks (varpool_node
*node
);
2446 /* Call all node insertion hooks. */
2447 void call_varpool_insertion_hooks (varpool_node
*node
);
2449 /* Arrange node to be first in its entry of assembler_name_hash. */
2450 void symtab_prevail_in_asm_name_hash (symtab_node
*node
);
2452 /* Initialize asm name hash unless. */
2453 void symtab_initialize_asm_name_hash (void);
2455 /* Set the DECL_ASSEMBLER_NAME and update symtab hashtables. */
2456 void change_decl_assembler_name (tree decl
, tree name
);
2458 /* Dump symbol table to F. */
2459 void dump (FILE *f
);
2461 /* Dump symbol table to F in graphviz format. */
2462 void dump_graphviz (FILE *f
);
2464 /* Dump symbol table to stderr. */
2465 void DEBUG_FUNCTION
debug (void);
2467 /* Assign a new summary ID for the callgraph NODE. */
2468 inline int assign_summary_id (cgraph_node
*node
)
2470 if (!cgraph_released_summary_ids
.is_empty ())
2471 node
->m_summary_id
= cgraph_released_summary_ids
.pop ();
2473 node
->m_summary_id
= cgraph_max_summary_id
++;
2475 return node
->m_summary_id
;
2478 /* Assign a new summary ID for the callgraph EDGE. */
2479 inline int assign_summary_id (cgraph_edge
*edge
)
2481 if (!edge_released_summary_ids
.is_empty ())
2482 edge
->m_summary_id
= edge_released_summary_ids
.pop ();
2484 edge
->m_summary_id
= edges_max_summary_id
++;
2486 return edge
->m_summary_id
;
2489 /* Return true if assembler names NAME1 and NAME2 leads to the same symbol
2491 static bool assembler_names_equal_p (const char *name1
, const char *name2
);
2495 int cgraph_max_summary_id
;
2499 int edges_max_summary_id
;
2501 /* Vector of released summary IDS for cgraph nodes. */
2502 vec
<int> GTY ((skip
)) cgraph_released_summary_ids
;
2504 /* Vector of released summary IDS for cgraph nodes. */
2505 vec
<int> GTY ((skip
)) edge_released_summary_ids
;
2507 /* Return symbol used to separate symbol name from suffix. */
2508 static char symbol_suffix_separator ();
2510 symtab_node
* GTY(()) nodes
;
2511 asm_node
* GTY(()) asmnodes
;
2512 asm_node
* GTY(()) asm_last_node
;
2514 /* The order index of the next symtab node to be created. This is
2515 used so that we can sort the cgraph nodes in order by when we saw
2516 them, to support -fno-toplevel-reorder. */
2519 /* Maximal unit ID used. */
2522 /* Set when whole unit has been analyzed so we can access global info. */
2523 bool global_info_ready
;
2524 /* What state callgraph is in right now. */
2525 enum symtab_state state
;
2526 /* Set when the cgraph is fully build and the basic flags are computed. */
2527 bool function_flags_ready
;
2529 bool cpp_implicit_aliases_done
;
2531 /* Hash table used to hold sections. */
2532 hash_table
<section_name_hasher
> *GTY(()) section_hash
;
2534 /* Hash table used to convert assembler names into nodes. */
2535 hash_table
<asmname_hasher
> *assembler_name_hash
;
2537 /* Hash table used to hold init priorities. */
2538 hash_map
<symtab_node
*, symbol_priority_map
> *init_priority_hash
;
2540 FILE* GTY ((skip
)) dump_file
;
2542 FILE* GTY ((skip
)) ipa_clones_dump_file
;
2544 hash_set
<const cgraph_node
*> GTY ((skip
)) cloned_nodes
;
2547 /* Allocate a cgraph_edge structure and fill it with data according to the
2548 parameters of which only CALLEE can be NULL (when creating an indirect
2549 call edge). CLONING_P should be set if properties that are copied from an
2550 original edge should not be calculated. */
2551 cgraph_edge
*create_edge (cgraph_node
*caller
, cgraph_node
*callee
,
2552 gcall
*call_stmt
, profile_count count
,
2553 bool indir_unknown_callee
, bool cloning_p
);
2555 /* Put the edge onto the free list. */
2556 void free_edge (cgraph_edge
*e
);
2558 /* Insert NODE to assembler name hash. */
2559 void insert_to_assembler_name_hash (symtab_node
*node
, bool with_clones
);
2561 /* Remove NODE from assembler name hash. */
2562 void unlink_from_assembler_name_hash (symtab_node
*node
, bool with_clones
);
2564 /* Hash asmnames ignoring the user specified marks. */
2565 static hashval_t
decl_assembler_name_hash (const_tree asmname
);
2567 /* Compare ASMNAME with the DECL_ASSEMBLER_NAME of DECL. */
2568 static bool decl_assembler_name_equal (tree decl
, const_tree asmname
);
2570 friend struct asmname_hasher
;
2572 /* List of hooks triggered when an edge is removed. */
2573 cgraph_edge_hook_list
* GTY((skip
)) m_first_edge_removal_hook
;
2574 /* List of hooks trigger_red when a cgraph node is removed. */
2575 cgraph_node_hook_list
* GTY((skip
)) m_first_cgraph_removal_hook
;
2576 /* List of hooks triggered when an edge is duplicated. */
2577 cgraph_2edge_hook_list
* GTY((skip
)) m_first_edge_duplicated_hook
;
2578 /* List of hooks triggered when a node is duplicated. */
2579 cgraph_2node_hook_list
* GTY((skip
)) m_first_cgraph_duplicated_hook
;
2580 /* List of hooks triggered when an function is inserted. */
2581 cgraph_node_hook_list
* GTY((skip
)) m_first_cgraph_insertion_hook
;
2582 /* List of hooks triggered when an variable is inserted. */
2583 varpool_node_hook_list
* GTY((skip
)) m_first_varpool_insertion_hook
;
2584 /* List of hooks triggered when a node is removed. */
2585 varpool_node_hook_list
* GTY((skip
)) m_first_varpool_removal_hook
;
2588 extern GTY(()) symbol_table
*symtab
;
2590 extern vec
<cgraph_node
*> cgraph_new_nodes
;
2593 asmname_hasher::hash (symtab_node
*n
)
2595 return symbol_table::decl_assembler_name_hash
2596 (DECL_ASSEMBLER_NAME (n
->decl
));
2600 asmname_hasher::equal (symtab_node
*n
, const_tree t
)
2602 return symbol_table::decl_assembler_name_equal (n
->decl
, t
);
2606 void cgraph_c_finalize (void);
2607 void release_function_body (tree
);
2608 cgraph_indirect_call_info
*cgraph_allocate_init_indirect_info (void);
2610 void cgraph_update_edges_for_call_stmt (gimple
*, tree
, gimple
*);
2611 bool cgraph_function_possibly_inlined_p (tree
);
2613 const char* cgraph_inline_failed_string (cgraph_inline_failed_t
);
2614 cgraph_inline_failed_type_t
cgraph_inline_failed_type (cgraph_inline_failed_t
);
2616 /* In cgraphunit.c */
2617 void cgraphunit_c_finalize (void);
2618 int tp_first_run_node_cmp (const void *pa
, const void *pb
);
2620 /* Initialize datastructures so DECL is a function in lowered gimple form.
2621 IN_SSA is true if the gimple is in SSA. */
2622 basic_block
init_lowered_empty_function (tree
, bool, profile_count
);
2624 tree
thunk_adjust (gimple_stmt_iterator
*, tree
, bool, HOST_WIDE_INT
, tree
,
2626 /* In cgraphclones.c */
2628 tree
clone_function_name_numbered (const char *name
, const char *suffix
);
2629 tree
clone_function_name_numbered (tree decl
, const char *suffix
);
2630 tree
clone_function_name (const char *name
, const char *suffix
,
2631 unsigned long number
);
2632 tree
clone_function_name (tree decl
, const char *suffix
,
2633 unsigned long number
);
2634 tree
clone_function_name (tree decl
, const char *suffix
);
2636 void tree_function_versioning (tree
, tree
, vec
<ipa_replace_map
*, va_gc
> *,
2637 ipa_param_adjustments
*,
2638 bool, bitmap
, basic_block
);
2640 void dump_callgraph_transformation (const cgraph_node
*original
,
2641 const cgraph_node
*clone
,
2642 const char *suffix
);
2643 /* In cgraphbuild.c */
2644 int compute_call_stmt_bb_frequency (tree
, basic_block bb
);
2645 void record_references_in_initializer (tree
, bool);
2648 void cgraph_build_static_cdtor (char which
, tree body
, int priority
);
2649 bool ipa_discover_variable_flags (void);
2652 tree
ctor_for_folding (tree
);
2654 /* In ipa-inline-analysis.c */
2655 void initialize_inline_failed (struct cgraph_edge
*);
2656 bool speculation_useful_p (struct cgraph_edge
*e
, bool anticipate_inlining
);
2658 /* Return true when the symbol is real symbol, i.e. it is not inline clone
2659 or abstract function kept for debug info purposes only. */
2661 symtab_node::real_symbol_p (void)
2665 if (DECL_ABSTRACT_P (decl
))
2667 if (transparent_alias
&& definition
)
2669 if (!is_a
<cgraph_node
*> (this))
2671 cnode
= dyn_cast
<cgraph_node
*> (this);
2672 if (cnode
->inlined_to
)
2677 /* Return true if DECL should have entry in symbol table if used.
2678 Those are functions and static & external variables. */
2681 decl_in_symtab_p (const_tree decl
)
2683 return (TREE_CODE (decl
) == FUNCTION_DECL
2684 || (TREE_CODE (decl
) == VAR_DECL
2685 && (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
))));
2689 symtab_node::in_same_comdat_group_p (symtab_node
*target
)
2691 symtab_node
*source
= this;
2693 if (cgraph_node
*cn
= dyn_cast
<cgraph_node
*> (target
))
2696 source
= cn
->inlined_to
;
2698 if (cgraph_node
*cn
= dyn_cast
<cgraph_node
*> (target
))
2701 target
= cn
->inlined_to
;
2704 return source
->get_comdat_group () == target
->get_comdat_group ();
2707 /* Return node that alias is aliasing. */
2709 inline symtab_node
*
2710 symtab_node::get_alias_target (void)
2712 ipa_ref
*ref
= NULL
;
2713 iterate_reference (0, ref
);
2714 gcc_checking_assert (ref
->use
== IPA_REF_ALIAS
);
2715 return ref
->referred
;
2718 /* Return next reachable static symbol with initializer after the node. */
2720 inline symtab_node
*
2721 symtab_node::next_defined_symbol (void)
2723 symtab_node
*node1
= next
;
2725 for (; node1
; node1
= node1
->next
)
2726 if (node1
->definition
)
2732 /* Iterates I-th reference in the list, REF is also set. */
2735 symtab_node::iterate_reference (unsigned i
, ipa_ref
*&ref
)
2737 vec_safe_iterate (ref_list
.references
, i
, &ref
);
2742 /* Iterates I-th referring item in the list, REF is also set. */
2745 symtab_node::iterate_referring (unsigned i
, ipa_ref
*&ref
)
2747 ref_list
.referring
.iterate (i
, &ref
);
2752 /* Iterates I-th referring alias item in the list, REF is also set. */
2755 symtab_node::iterate_direct_aliases (unsigned i
, ipa_ref
*&ref
)
2757 ref_list
.referring
.iterate (i
, &ref
);
2759 if (ref
&& ref
->use
!= IPA_REF_ALIAS
)
2765 /* Return true if list contains an alias. */
2768 symtab_node::has_aliases_p (void)
2770 ipa_ref
*ref
= NULL
;
2772 return (iterate_direct_aliases (0, ref
) != NULL
);
2775 /* Return true when RESOLUTION indicate that linker will use
2776 the symbol from non-LTO object files. */
2779 resolution_used_from_other_file_p (enum ld_plugin_symbol_resolution resolution
)
2781 return (resolution
== LDPR_PREVAILING_DEF
2782 || resolution
== LDPR_PREEMPTED_REG
2783 || resolution
== LDPR_RESOLVED_EXEC
2784 || resolution
== LDPR_RESOLVED_DYN
);
2787 /* Return true when symtab_node is known to be used from other (non-LTO)
2788 object file. Known only when doing LTO via linker plugin. */
2791 symtab_node::used_from_object_file_p (void)
2793 if (!TREE_PUBLIC (decl
) || DECL_EXTERNAL (decl
))
2795 if (resolution_used_from_other_file_p (resolution
))
2800 /* Return varpool node for given symbol and check it is a function. */
2802 inline varpool_node
*
2803 varpool_node::get (const_tree decl
)
2805 gcc_checking_assert (TREE_CODE (decl
) == VAR_DECL
);
2806 return dyn_cast
<varpool_node
*> (symtab_node::get (decl
));
2809 /* Register a symbol NODE. */
2812 symbol_table::register_symbol (symtab_node
*node
)
2815 node
->previous
= NULL
;
2818 nodes
->previous
= node
;
2821 node
->order
= order
++;
2824 /* Register a top-level asm statement ASM_STR. */
2827 symbol_table::finalize_toplevel_asm (tree asm_str
)
2831 node
= ggc_cleared_alloc
<asm_node
> ();
2832 node
->asm_str
= asm_str
;
2833 node
->order
= order
++;
2836 if (asmnodes
== NULL
)
2839 asm_last_node
->next
= node
;
2841 asm_last_node
= node
;
2845 /* Unregister a symbol NODE. */
2847 symbol_table::unregister (symtab_node
*node
)
2850 node
->previous
->next
= node
->next
;
2855 node
->next
->previous
= node
->previous
;
2858 node
->previous
= NULL
;
2861 /* Release a callgraph NODE with UID and put in to the list of free nodes. */
2864 symbol_table::release_symbol (cgraph_node
*node
)
2867 if (node
->m_summary_id
!= -1)
2868 cgraph_released_summary_ids
.safe_push (node
->m_summary_id
);
2872 /* Return first static symbol with definition. */
2873 inline symtab_node
*
2874 symbol_table::first_symbol (void)
2879 /* Walk all symbols. */
2880 #define FOR_EACH_SYMBOL(node) \
2881 for ((node) = symtab->first_symbol (); (node); (node) = (node)->next)
2883 /* Return first static symbol with definition. */
2884 inline symtab_node
*
2885 symbol_table::first_defined_symbol (void)
2889 for (node
= nodes
; node
; node
= node
->next
)
2890 if (node
->definition
)
2896 /* Walk all symbols with definitions in current unit. */
2897 #define FOR_EACH_DEFINED_SYMBOL(node) \
2898 for ((node) = symtab->first_defined_symbol (); (node); \
2899 (node) = node->next_defined_symbol ())
2901 /* Return first variable. */
2902 inline varpool_node
*
2903 symbol_table::first_variable (void)
2906 for (node
= nodes
; node
; node
= node
->next
)
2907 if (varpool_node
*vnode
= dyn_cast
<varpool_node
*> (node
))
2912 /* Return next variable after NODE. */
2913 inline varpool_node
*
2914 symbol_table::next_variable (varpool_node
*node
)
2916 symtab_node
*node1
= node
->next
;
2917 for (; node1
; node1
= node1
->next
)
2918 if (varpool_node
*vnode1
= dyn_cast
<varpool_node
*> (node1
))
2922 /* Walk all variables. */
2923 #define FOR_EACH_VARIABLE(node) \
2924 for ((node) = symtab->first_variable (); \
2926 (node) = symtab->next_variable ((node)))
2928 /* Return first static variable with initializer. */
2929 inline varpool_node
*
2930 symbol_table::first_static_initializer (void)
2933 for (node
= nodes
; node
; node
= node
->next
)
2935 varpool_node
*vnode
= dyn_cast
<varpool_node
*> (node
);
2936 if (vnode
&& DECL_INITIAL (node
->decl
))
2942 /* Return next static variable with initializer after NODE. */
2943 inline varpool_node
*
2944 symbol_table::next_static_initializer (varpool_node
*node
)
2946 symtab_node
*node1
= node
->next
;
2947 for (; node1
; node1
= node1
->next
)
2949 varpool_node
*vnode1
= dyn_cast
<varpool_node
*> (node1
);
2950 if (vnode1
&& DECL_INITIAL (node1
->decl
))
2956 /* Walk all static variables with initializer set. */
2957 #define FOR_EACH_STATIC_INITIALIZER(node) \
2958 for ((node) = symtab->first_static_initializer (); (node); \
2959 (node) = symtab->next_static_initializer (node))
2961 /* Return first static variable with definition. */
2962 inline varpool_node
*
2963 symbol_table::first_defined_variable (void)
2966 for (node
= nodes
; node
; node
= node
->next
)
2968 varpool_node
*vnode
= dyn_cast
<varpool_node
*> (node
);
2969 if (vnode
&& vnode
->definition
)
2975 /* Return next static variable with definition after NODE. */
2976 inline varpool_node
*
2977 symbol_table::next_defined_variable (varpool_node
*node
)
2979 symtab_node
*node1
= node
->next
;
2980 for (; node1
; node1
= node1
->next
)
2982 varpool_node
*vnode1
= dyn_cast
<varpool_node
*> (node1
);
2983 if (vnode1
&& vnode1
->definition
)
2988 /* Walk all variables with definitions in current unit. */
2989 #define FOR_EACH_DEFINED_VARIABLE(node) \
2990 for ((node) = symtab->first_defined_variable (); (node); \
2991 (node) = symtab->next_defined_variable (node))
2993 /* Return first function with body defined. */
2994 inline cgraph_node
*
2995 symbol_table::first_defined_function (void)
2998 for (node
= nodes
; node
; node
= node
->next
)
3000 cgraph_node
*cn
= dyn_cast
<cgraph_node
*> (node
);
3001 if (cn
&& cn
->definition
)
3007 /* Return next function with body defined after NODE. */
3008 inline cgraph_node
*
3009 symbol_table::next_defined_function (cgraph_node
*node
)
3011 symtab_node
*node1
= node
->next
;
3012 for (; node1
; node1
= node1
->next
)
3014 cgraph_node
*cn1
= dyn_cast
<cgraph_node
*> (node1
);
3015 if (cn1
&& cn1
->definition
)
3021 /* Walk all functions with body defined. */
3022 #define FOR_EACH_DEFINED_FUNCTION(node) \
3023 for ((node) = symtab->first_defined_function (); (node); \
3024 (node) = symtab->next_defined_function ((node)))
3026 /* Return first function. */
3027 inline cgraph_node
*
3028 symbol_table::first_function (void)
3031 for (node
= nodes
; node
; node
= node
->next
)
3032 if (cgraph_node
*cn
= dyn_cast
<cgraph_node
*> (node
))
3037 /* Return next function. */
3038 inline cgraph_node
*
3039 symbol_table::next_function (cgraph_node
*node
)
3041 symtab_node
*node1
= node
->next
;
3042 for (; node1
; node1
= node1
->next
)
3043 if (cgraph_node
*cn1
= dyn_cast
<cgraph_node
*> (node1
))
3048 /* Return first function with body defined. */
3049 inline cgraph_node
*
3050 symbol_table::first_function_with_gimple_body (void)
3053 for (node
= nodes
; node
; node
= node
->next
)
3055 cgraph_node
*cn
= dyn_cast
<cgraph_node
*> (node
);
3056 if (cn
&& cn
->has_gimple_body_p ())
3062 /* Return next reachable static variable with initializer after NODE. */
3063 inline cgraph_node
*
3064 symbol_table::next_function_with_gimple_body (cgraph_node
*node
)
3066 symtab_node
*node1
= node
->next
;
3067 for (; node1
; node1
= node1
->next
)
3069 cgraph_node
*cn1
= dyn_cast
<cgraph_node
*> (node1
);
3070 if (cn1
&& cn1
->has_gimple_body_p ())
3076 /* Walk all functions. */
3077 #define FOR_EACH_FUNCTION(node) \
3078 for ((node) = symtab->first_function (); (node); \
3079 (node) = symtab->next_function ((node)))
3081 /* Return true when callgraph node is a function with Gimple body defined
3082 in current unit. Functions can also be define externally or they
3083 can be thunks with no Gimple representation.
3085 Note that at WPA stage, the function body may not be present in memory. */
3088 cgraph_node::has_gimple_body_p (void)
3090 return definition
&& !thunk
.thunk_p
&& !alias
;
3093 /* Return true if this node represents a former, i.e. an expanded, thunk. */
3096 cgraph_node::former_thunk_p (void)
3098 return (!thunk
.thunk_p
3099 && (thunk
.fixed_offset
3100 || thunk
.virtual_offset_p
3101 || thunk
.indirect_offset
));
3104 /* Walk all functions with body defined. */
3105 #define FOR_EACH_FUNCTION_WITH_GIMPLE_BODY(node) \
3106 for ((node) = symtab->first_function_with_gimple_body (); (node); \
3107 (node) = symtab->next_function_with_gimple_body (node))
3109 /* Uniquize all constants that appear in memory.
3110 Each constant in memory thus far output is recorded
3111 in `const_desc_table'. */
3113 struct GTY((for_user
)) constant_descriptor_tree
{
3114 /* A MEM for the constant. */
3117 /* The value of the constant. */
3120 /* Hash of value. Computing the hash from value each time
3121 hashfn is called can't work properly, as that means recursive
3122 use of the hash table during hash table expansion. */
3126 /* Return true when function is only called directly or it has alias.
3127 i.e. it is not externally visible, address was not taken and
3128 it is not used in any other non-standard way. */
3131 cgraph_node::only_called_directly_or_aliased_p (void)
3133 gcc_assert (!inlined_to
);
3134 return (!force_output
&& !address_taken
3136 && !used_from_other_partition
3137 && !DECL_VIRTUAL_P (decl
)
3138 && !DECL_STATIC_CONSTRUCTOR (decl
)
3139 && !DECL_STATIC_DESTRUCTOR (decl
)
3140 && !used_from_object_file_p ()
3141 && !externally_visible
);
3144 /* Return true when function can be removed from callgraph
3145 if all direct calls are eliminated. */
3148 cgraph_node::can_remove_if_no_direct_calls_and_refs_p (void)
3150 gcc_checking_assert (!inlined_to
);
3151 /* Extern inlines can always go, we will use the external definition. */
3152 if (DECL_EXTERNAL (decl
))
3154 /* When function is needed, we cannot remove it. */
3155 if (force_output
|| used_from_other_partition
)
3157 if (DECL_STATIC_CONSTRUCTOR (decl
)
3158 || DECL_STATIC_DESTRUCTOR (decl
))
3160 /* Only COMDAT functions can be removed if externally visible. */
3161 if (externally_visible
3162 && ((!DECL_COMDAT (decl
) || ifunc_resolver
)
3164 || used_from_object_file_p ()))
3169 /* Verify cgraph, if consistency checking is enabled. */
3172 cgraph_node::checking_verify_cgraph_nodes (void)
3175 cgraph_node::verify_cgraph_nodes ();
3178 /* Return true when variable can be removed from variable pool
3179 if all direct calls are eliminated. */
3182 varpool_node::can_remove_if_no_refs_p (void)
3184 if (DECL_EXTERNAL (decl
))
3186 return (!force_output
&& !used_from_other_partition
3187 && ((DECL_COMDAT (decl
)
3189 && !used_from_object_file_p ())
3190 || !externally_visible
3191 || DECL_HAS_VALUE_EXPR_P (decl
)));
3194 /* Return true when all references to variable must be visible in ipa_ref_list.
3195 i.e. if the variable is not externally visible or not used in some magic
3196 way (asm statement or such).
3197 The magic uses are all summarized in force_output flag. */
3200 varpool_node::all_refs_explicit_p ()
3203 && !externally_visible
3204 && !used_from_other_partition
3208 struct tree_descriptor_hasher
: ggc_ptr_hash
<constant_descriptor_tree
>
3210 static hashval_t
hash (constant_descriptor_tree
*);
3211 static bool equal (constant_descriptor_tree
*, constant_descriptor_tree
*);
3214 /* Constant pool accessor function. */
3215 hash_table
<tree_descriptor_hasher
> *constant_pool_htab (void);
3217 /* Return node that alias is aliasing. */
3219 inline cgraph_node
*
3220 cgraph_node::get_alias_target (void)
3222 return dyn_cast
<cgraph_node
*> (symtab_node::get_alias_target ());
3225 /* Return node that alias is aliasing. */
3227 inline varpool_node
*
3228 varpool_node::get_alias_target (void)
3230 return dyn_cast
<varpool_node
*> (symtab_node::get_alias_target ());
3233 /* Walk the alias chain to return the symbol NODE is alias of.
3234 If NODE is not an alias, return NODE.
3235 When AVAILABILITY is non-NULL, get minimal availability in the chain.
3236 When REF is non-NULL, assume that reference happens in symbol REF
3237 when determining the availability. */
3239 inline symtab_node
*
3240 symtab_node::ultimate_alias_target (enum availability
*availability
,
3246 *availability
= get_availability (ref
);
3250 return ultimate_alias_target_1 (availability
, ref
);
3253 /* Given function symbol, walk the alias chain to return the function node
3254 is alias of. Do not walk through thunks.
3255 When AVAILABILITY is non-NULL, get minimal availability in the chain.
3256 When REF is non-NULL, assume that reference happens in symbol REF
3257 when determining the availability. */
3259 inline cgraph_node
*
3260 cgraph_node::ultimate_alias_target (enum availability
*availability
,
3263 cgraph_node
*n
= dyn_cast
<cgraph_node
*>
3264 (symtab_node::ultimate_alias_target (availability
, ref
));
3265 if (!n
&& availability
)
3266 *availability
= AVAIL_NOT_AVAILABLE
;
3270 /* For given variable pool node, walk the alias chain to return the function
3271 the variable is alias of. Do not walk through thunks.
3272 When AVAILABILITY is non-NULL, get minimal availability in the chain.
3273 When REF is non-NULL, assume that reference happens in symbol REF
3274 when determining the availability. */
3276 inline varpool_node
*
3277 varpool_node::ultimate_alias_target (availability
*availability
,
3280 varpool_node
*n
= dyn_cast
<varpool_node
*>
3281 (symtab_node::ultimate_alias_target (availability
, ref
));
3283 if (!n
&& availability
)
3284 *availability
= AVAIL_NOT_AVAILABLE
;
3288 /* Set callee N of call graph edge and add it to the corresponding set of
3292 cgraph_edge::set_callee (cgraph_node
*n
)
3296 n
->callers
->prev_caller
= this;
3297 next_caller
= n
->callers
;
3302 /* Return true when the edge represents a direct recursion. */
3305 cgraph_edge::recursive_p (void)
3307 cgraph_node
*c
= callee
->ultimate_alias_target ();
3308 if (caller
->inlined_to
)
3309 return caller
->inlined_to
->decl
== c
->decl
;
3311 return caller
->decl
== c
->decl
;
3314 /* Remove the edge from the list of the callers of the callee. */
3317 cgraph_edge::remove_callee (void)
3319 gcc_assert (!indirect_unknown_callee
);
3321 prev_caller
->next_caller
= next_caller
;
3323 next_caller
->prev_caller
= prev_caller
;
3325 callee
->callers
= next_caller
;
3328 /* Return true if call must bind to current definition. */
3331 cgraph_edge::binds_to_current_def_p ()
3334 return callee
->binds_to_current_def_p (caller
);
3339 /* Expected frequency of executions within the function.
3340 When set to CGRAPH_FREQ_BASE, the edge is expected to be called once
3341 per function call. The range is 0 to CGRAPH_FREQ_MAX. */
3344 cgraph_edge::frequency ()
3346 return count
.to_cgraph_frequency (caller
->inlined_to
3347 ? caller
->inlined_to
->count
3352 /* Return true if the TM_CLONE bit is set for a given FNDECL. */
3354 decl_is_tm_clone (const_tree fndecl
)
3356 cgraph_node
*n
= cgraph_node::get (fndecl
);
3362 /* Likewise indicate that a node is needed, i.e. reachable via some
3366 cgraph_node::mark_force_output (void)
3369 gcc_checking_assert (!inlined_to
);
3372 /* Return true if function should be optimized for size. */
3375 cgraph_node::optimize_for_size_p (void)
3377 if (opt_for_fn (decl
, optimize_size
))
3379 if (frequency
== NODE_FREQUENCY_UNLIKELY_EXECUTED
)
3385 /* Return symtab_node for NODE or create one if it is not present
3388 inline symtab_node
*
3389 symtab_node::get_create (tree node
)
3391 if (TREE_CODE (node
) == VAR_DECL
)
3392 return varpool_node::get_create (node
);
3394 return cgraph_node::get_create (node
);
3397 /* Return availability of NODE when referenced from REF. */
3399 inline enum availability
3400 symtab_node::get_availability (symtab_node
*ref
)
3402 if (is_a
<cgraph_node
*> (this))
3403 return dyn_cast
<cgraph_node
*> (this)->get_availability (ref
);
3405 return dyn_cast
<varpool_node
*> (this)->get_availability (ref
);
3408 /* Call callback on symtab node and aliases associated to this node.
3409 When INCLUDE_OVERWRITABLE is false, overwritable symbols are skipped. */
3412 symtab_node::call_for_symbol_and_aliases (bool (*callback
) (symtab_node
*,
3415 bool include_overwritable
)
3417 if (include_overwritable
3418 || get_availability () > AVAIL_INTERPOSABLE
)
3420 if (callback (this, data
))
3423 if (has_aliases_p ())
3424 return call_for_symbol_and_aliases_1 (callback
, data
, include_overwritable
);
3428 /* Call callback on function and aliases associated to the function.
3429 When INCLUDE_OVERWRITABLE is false, overwritable symbols are
3433 cgraph_node::call_for_symbol_and_aliases (bool (*callback
) (cgraph_node
*,
3436 bool include_overwritable
)
3438 if (include_overwritable
3439 || get_availability () > AVAIL_INTERPOSABLE
)
3441 if (callback (this, data
))
3444 if (has_aliases_p ())
3445 return call_for_symbol_and_aliases_1 (callback
, data
, include_overwritable
);
3449 /* Call callback on varpool symbol and aliases associated to varpool symbol.
3450 When INCLUDE_OVERWRITABLE is false, overwritable symbols are
3454 varpool_node::call_for_symbol_and_aliases (bool (*callback
) (varpool_node
*,
3457 bool include_overwritable
)
3459 if (include_overwritable
3460 || get_availability () > AVAIL_INTERPOSABLE
)
3462 if (callback (this, data
))
3465 if (has_aliases_p ())
3466 return call_for_symbol_and_aliases_1 (callback
, data
, include_overwritable
);
3470 /* Return true if reference may be used in address compare. */
3473 ipa_ref::address_matters_p ()
3475 if (use
!= IPA_REF_ADDR
)
3477 /* Addresses taken from virtual tables are never compared. */
3478 if (is_a
<varpool_node
*> (referring
)
3479 && DECL_VIRTUAL_P (referring
->decl
))
3481 return referred
->address_can_be_compared_p ();
3484 /* Build polymorphic call context for indirect call E. */
3487 ipa_polymorphic_call_context::ipa_polymorphic_call_context (cgraph_edge
*e
)
3489 gcc_checking_assert (e
->indirect_info
->polymorphic
);
3490 *this = e
->indirect_info
->context
;
3493 /* Build empty "I know nothing" context. */
3496 ipa_polymorphic_call_context::ipa_polymorphic_call_context ()
3498 clear_speculation ();
3499 clear_outer_type ();
3503 /* Make context non-speculative. */
3506 ipa_polymorphic_call_context::clear_speculation ()
3508 speculative_outer_type
= NULL
;
3509 speculative_offset
= 0;
3510 speculative_maybe_derived_type
= false;
3513 /* Produce context specifying all derived types of OTR_TYPE. If OTR_TYPE is
3514 NULL, the context is set to dummy "I know nothing" setting. */
3517 ipa_polymorphic_call_context::clear_outer_type (tree otr_type
)
3519 outer_type
= otr_type
? TYPE_MAIN_VARIANT (otr_type
) : NULL
;
3521 maybe_derived_type
= true;
3522 maybe_in_construction
= true;
3526 /* Adjust all offsets in contexts by OFF bits. */
3529 ipa_polymorphic_call_context::offset_by (HOST_WIDE_INT off
)
3533 if (speculative_outer_type
)
3534 speculative_offset
+= off
;
3537 /* Return TRUE if context is fully useless. */
3540 ipa_polymorphic_call_context::useless_p () const
3542 return (!outer_type
&& !speculative_outer_type
);
3545 /* When using fprintf (or similar), problems can arise with
3546 transient generated strings. Many string-generation APIs
3547 only support one result being alive at once (e.g. by
3548 returning a pointer to a statically-allocated buffer).
3550 If there is more than one generated string within one
3551 fprintf call: the first string gets evicted or overwritten
3552 by the second, before fprintf is fully evaluated.
3555 This function provides a workaround for this, by providing
3556 a simple way to create copies of these transient strings,
3557 without the need to have explicit cleanup:
3559 fprintf (dumpfile, "string 1: %s string 2:%s\n",
3560 xstrdup_for_dump (EXPR_1),
3561 xstrdup_for_dump (EXPR_2));
3563 This is actually a simple wrapper around ggc_strdup, but
3564 the name documents the intent. We require that no GC can occur
3565 within the fprintf call. */
3567 static inline const char *
3568 xstrdup_for_dump (const char *transient_str
)
3570 return ggc_strdup (transient_str
);
3573 /* During LTO stream-in this predicate can be used to check whether node
3574 in question prevails in the linking to save some memory usage. */
3576 symtab_node::prevailing_p (void)
3578 return definition
&& ((!TREE_PUBLIC (decl
) && !DECL_EXTERNAL (decl
))
3579 || previous_sharing_asm_name
== NULL
);
3582 extern GTY(()) symbol_table
*saved_symtab
;
3586 namespace selftest
{
3588 /* An RAII-style class for use in selftests for temporarily using a different
3589 symbol_table, so that such tests can be isolated from each other. */
3591 class symbol_table_test
3594 /* Constructor. Override "symtab". */
3595 symbol_table_test ();
3597 /* Destructor. Restore the saved_symtab. */
3598 ~symbol_table_test ();
3601 } // namespace selftest
3603 #endif /* CHECKING_P */
3605 #endif /* GCC_CGRAPH_H */