1 /* Callgraph handling code.
2 Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009
3 Free Software Foundation, Inc.
4 Contributed by Jan Hubicka
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
22 /* This file contains basic routines manipulating call graph
26 The call-graph is data structure designed for intra-procedural optimization
27 but it is also used in non-unit-at-a-time compilation to allow easier code
30 The call-graph consist of nodes and edges represented via linked lists.
31 Each function (external or not) corresponds to the unique node.
33 The mapping from declarations to call-graph nodes is done using hash table
34 based on DECL_UID. The call-graph nodes are created lazily using
35 cgraph_node function when called for unknown declaration.
37 The callgraph at the moment does not represent indirect calls or calls
38 from other compilation unit. Flag NEEDED is set for each node that may
39 be accessed in such an invisible way and it shall be considered an
40 entry point to the callgraph.
42 Interprocedural information:
44 Callgraph is place to store data needed for interprocedural optimization.
45 All data structures are divided into three components: local_info that
46 is produced while analyzing the function, global_info that is result
47 of global walking of the callgraph on the end of compilation and
48 rtl_info used by RTL backend to propagate data from already compiled
49 functions to their callers.
53 The function inlining information is decided in advance and maintained
54 in the callgraph as so called inline plan.
55 For each inlined call, the callee's node is cloned to represent the
56 new function copy produced by inliner.
57 Each inlined call gets a unique corresponding clone node of the callee
58 and the data structure is updated while inlining is performed, so
59 the clones are eliminated and their callee edges redirected to the
62 Each edge has "inline_failed" field. When the field is set to NULL,
63 the call will be inlined. When it is non-NULL it contains a reason
64 why inlining wasn't performed. */
68 #include "coretypes.h"
71 #include "tree-inline.h"
72 #include "langhooks.h"
79 #include "basic-block.h"
84 #include "tree-dump.h"
85 #include "tree-flow.h"
86 #include "value-prof.h"
89 static void cgraph_node_remove_callers (struct cgraph_node *node);
90 static inline void cgraph_edge_remove_caller (struct cgraph_edge *e);
91 static inline void cgraph_edge_remove_callee (struct cgraph_edge *e);
93 /* Hash table used to convert declarations into nodes. */
94 static GTY((param_is (struct cgraph_node))) htab_t cgraph_hash;
95 /* Hash table used to convert assembler names into nodes. */
96 static GTY((param_is (struct cgraph_node))) htab_t assembler_name_hash;
98 /* The linked list of cgraph nodes. */
99 struct cgraph_node *cgraph_nodes;
101 /* Queue of cgraph nodes scheduled to be lowered. */
102 struct cgraph_node *cgraph_nodes_queue;
104 /* Queue of cgraph nodes scheduled to be added into cgraph. This is a
105 secondary queue used during optimization to accommodate passes that
106 may generate new functions that need to be optimized and expanded. */
107 struct cgraph_node *cgraph_new_nodes;
109 /* Number of nodes in existence. */
112 /* Maximal uid used in cgraph nodes. */
115 /* Maximal uid used in cgraph edges. */
116 int cgraph_edge_max_uid;
118 /* Maximal pid used for profiling */
121 /* Set when whole unit has been analyzed so we can access global info. */
122 bool cgraph_global_info_ready = false;
124 /* What state callgraph is in right now. */
125 enum cgraph_state cgraph_state = CGRAPH_STATE_CONSTRUCTION;
127 /* Set when the cgraph is fully build and the basic flags are computed. */
128 bool cgraph_function_flags_ready = false;
130 /* Linked list of cgraph asm nodes. */
131 struct cgraph_asm_node *cgraph_asm_nodes;
133 /* Last node in cgraph_asm_nodes. */
134 static GTY(()) struct cgraph_asm_node *cgraph_asm_last_node;
136 /* The order index of the next cgraph node to be created. This is
137 used so that we can sort the cgraph nodes in order by when we saw
138 them, to support -fno-toplevel-reorder. */
141 /* List of hooks trigerred on cgraph_edge events. */
142 struct cgraph_edge_hook_list {
143 cgraph_edge_hook hook;
145 struct cgraph_edge_hook_list *next;
148 /* List of hooks trigerred on cgraph_node events. */
149 struct cgraph_node_hook_list {
150 cgraph_node_hook hook;
152 struct cgraph_node_hook_list *next;
155 /* List of hooks trigerred on events involving two cgraph_edges. */
156 struct cgraph_2edge_hook_list {
157 cgraph_2edge_hook hook;
159 struct cgraph_2edge_hook_list *next;
162 /* List of hooks trigerred on events involving two cgraph_nodes. */
163 struct cgraph_2node_hook_list {
164 cgraph_2node_hook hook;
166 struct cgraph_2node_hook_list *next;
169 /* List of hooks triggered when an edge is removed. */
170 struct cgraph_edge_hook_list *first_cgraph_edge_removal_hook;
171 /* List of hooks triggered when a node is removed. */
172 struct cgraph_node_hook_list *first_cgraph_node_removal_hook;
173 /* List of hooks triggered when an edge is duplicated. */
174 struct cgraph_2edge_hook_list *first_cgraph_edge_duplicated_hook;
175 /* List of hooks triggered when a node is duplicated. */
176 struct cgraph_2node_hook_list *first_cgraph_node_duplicated_hook;
177 /* List of hooks triggered when an function is inserted. */
178 struct cgraph_node_hook_list *first_cgraph_function_insertion_hook;
180 /* Head of a linked list of unused (freed) call graph nodes.
181 Do not GTY((delete)) this list so UIDs gets reliably recycled. */
182 static GTY(()) struct cgraph_node *free_nodes;
183 /* Head of a linked list of unused (freed) call graph edges.
184 Do not GTY((delete)) this list so UIDs gets reliably recycled. */
185 static GTY(()) struct cgraph_edge *free_edges;
187 /* Macros to access the next item in the list of free cgraph nodes and
189 #define NEXT_FREE_NODE(NODE) (NODE)->next
190 #define NEXT_FREE_EDGE(EDGE) (EDGE)->prev_caller
192 /* Register HOOK to be called with DATA on each removed edge. */
193 struct cgraph_edge_hook_list *
194 cgraph_add_edge_removal_hook (cgraph_edge_hook hook, void *data)
196 struct cgraph_edge_hook_list *entry;
197 struct cgraph_edge_hook_list **ptr = &first_cgraph_edge_removal_hook;
199 entry = (struct cgraph_edge_hook_list *) xmalloc (sizeof (*entry));
209 /* Remove ENTRY from the list of hooks called on removing edges. */
211 cgraph_remove_edge_removal_hook (struct cgraph_edge_hook_list *entry)
213 struct cgraph_edge_hook_list **ptr = &first_cgraph_edge_removal_hook;
215 while (*ptr != entry)
221 /* Call all edge removal hooks. */
223 cgraph_call_edge_removal_hooks (struct cgraph_edge *e)
225 struct cgraph_edge_hook_list *entry = first_cgraph_edge_removal_hook;
228 entry->hook (e, entry->data);
233 /* Register HOOK to be called with DATA on each removed node. */
234 struct cgraph_node_hook_list *
235 cgraph_add_node_removal_hook (cgraph_node_hook hook, void *data)
237 struct cgraph_node_hook_list *entry;
238 struct cgraph_node_hook_list **ptr = &first_cgraph_node_removal_hook;
240 entry = (struct cgraph_node_hook_list *) xmalloc (sizeof (*entry));
250 /* Remove ENTRY from the list of hooks called on removing nodes. */
252 cgraph_remove_node_removal_hook (struct cgraph_node_hook_list *entry)
254 struct cgraph_node_hook_list **ptr = &first_cgraph_node_removal_hook;
256 while (*ptr != entry)
262 /* Call all node removal hooks. */
264 cgraph_call_node_removal_hooks (struct cgraph_node *node)
266 struct cgraph_node_hook_list *entry = first_cgraph_node_removal_hook;
269 entry->hook (node, entry->data);
274 /* Register HOOK to be called with DATA on each removed node. */
275 struct cgraph_node_hook_list *
276 cgraph_add_function_insertion_hook (cgraph_node_hook hook, void *data)
278 struct cgraph_node_hook_list *entry;
279 struct cgraph_node_hook_list **ptr = &first_cgraph_function_insertion_hook;
281 entry = (struct cgraph_node_hook_list *) xmalloc (sizeof (*entry));
291 /* Remove ENTRY from the list of hooks called on removing nodes. */
293 cgraph_remove_function_insertion_hook (struct cgraph_node_hook_list *entry)
295 struct cgraph_node_hook_list **ptr = &first_cgraph_function_insertion_hook;
297 while (*ptr != entry)
303 /* Call all node removal hooks. */
305 cgraph_call_function_insertion_hooks (struct cgraph_node *node)
307 struct cgraph_node_hook_list *entry = first_cgraph_function_insertion_hook;
310 entry->hook (node, entry->data);
315 /* Register HOOK to be called with DATA on each duplicated edge. */
316 struct cgraph_2edge_hook_list *
317 cgraph_add_edge_duplication_hook (cgraph_2edge_hook hook, void *data)
319 struct cgraph_2edge_hook_list *entry;
320 struct cgraph_2edge_hook_list **ptr = &first_cgraph_edge_duplicated_hook;
322 entry = (struct cgraph_2edge_hook_list *) xmalloc (sizeof (*entry));
332 /* Remove ENTRY from the list of hooks called on duplicating edges. */
334 cgraph_remove_edge_duplication_hook (struct cgraph_2edge_hook_list *entry)
336 struct cgraph_2edge_hook_list **ptr = &first_cgraph_edge_duplicated_hook;
338 while (*ptr != entry)
344 /* Call all edge duplication hooks. */
346 cgraph_call_edge_duplication_hooks (struct cgraph_edge *cs1,
347 struct cgraph_edge *cs2)
349 struct cgraph_2edge_hook_list *entry = first_cgraph_edge_duplicated_hook;
352 entry->hook (cs1, cs2, entry->data);
357 /* Register HOOK to be called with DATA on each duplicated node. */
358 struct cgraph_2node_hook_list *
359 cgraph_add_node_duplication_hook (cgraph_2node_hook hook, void *data)
361 struct cgraph_2node_hook_list *entry;
362 struct cgraph_2node_hook_list **ptr = &first_cgraph_node_duplicated_hook;
364 entry = (struct cgraph_2node_hook_list *) xmalloc (sizeof (*entry));
374 /* Remove ENTRY from the list of hooks called on duplicating nodes. */
376 cgraph_remove_node_duplication_hook (struct cgraph_2node_hook_list *entry)
378 struct cgraph_2node_hook_list **ptr = &first_cgraph_node_duplicated_hook;
380 while (*ptr != entry)
386 /* Call all node duplication hooks. */
388 cgraph_call_node_duplication_hooks (struct cgraph_node *node1,
389 struct cgraph_node *node2)
391 struct cgraph_2node_hook_list *entry = first_cgraph_node_duplicated_hook;
394 entry->hook (node1, node2, entry->data);
399 /* Returns a hash code for P. */
402 hash_node (const void *p)
404 const struct cgraph_node *n = (const struct cgraph_node *) p;
405 return (hashval_t) DECL_UID (n->decl);
409 /* Return the cgraph node associated with function DECL. If none
410 exists, return NULL. */
413 cgraph_node_for_decl (tree decl)
415 struct cgraph_node *node;
418 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL);
423 struct cgraph_node key;
426 slot = htab_find_slot (cgraph_hash, &key, NO_INSERT);
428 node = (struct cgraph_node *) *slot;
435 /* Returns nonzero if P1 and P2 are equal. */
438 eq_node (const void *p1, const void *p2)
440 const struct cgraph_node *n1 = (const struct cgraph_node *) p1;
441 const struct cgraph_node *n2 = (const struct cgraph_node *) p2;
442 return DECL_UID (n1->decl) == DECL_UID (n2->decl);
445 /* Allocate new callgraph node and insert it into basic data structures. */
447 static struct cgraph_node *
448 cgraph_create_node (void)
450 struct cgraph_node *node;
455 free_nodes = NEXT_FREE_NODE (node);
459 node = GGC_CNEW (struct cgraph_node);
460 node->uid = cgraph_max_uid++;
463 node->next = cgraph_nodes;
465 node->order = cgraph_order++;
467 cgraph_nodes->previous = node;
468 node->previous = NULL;
469 node->global.estimated_growth = INT_MIN;
475 /* Return cgraph node assigned to DECL. Create new one when needed. */
478 cgraph_node (tree decl)
480 struct cgraph_node key, *node, **slot;
482 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL);
485 cgraph_hash = htab_create_ggc (10, hash_node, eq_node, NULL);
489 slot = (struct cgraph_node **) htab_find_slot (cgraph_hash, &key, INSERT);
497 node = cgraph_create_node ();
500 if (DECL_CONTEXT (decl) && TREE_CODE (DECL_CONTEXT (decl)) == FUNCTION_DECL)
502 node->origin = cgraph_node (DECL_CONTEXT (decl));
503 node->next_nested = node->origin->nested;
504 node->origin->nested = node;
506 if (assembler_name_hash)
509 tree name = DECL_ASSEMBLER_NAME (decl);
511 aslot = htab_find_slot_with_hash (assembler_name_hash, name,
512 decl_assembler_name_hash (name),
514 /* We can have multiple declarations with same assembler name. For C++
515 it is __builtin_strlen and strlen, for instance. Do we need to
516 record them all? Original implementation marked just first one
517 so lets hope for the best. */
524 /* Returns the cgraph node assigned to DECL or NULL if no cgraph node
528 cgraph_get_node (tree decl)
530 struct cgraph_node key, *node = NULL, **slot;
532 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL);
535 cgraph_hash = htab_create_ggc (10, hash_node, eq_node, NULL);
539 slot = (struct cgraph_node **) htab_find_slot (cgraph_hash, &key,
547 /* Insert already constructed node into hashtable. */
550 cgraph_insert_node_to_hashtable (struct cgraph_node *node)
552 struct cgraph_node **slot;
554 slot = (struct cgraph_node **) htab_find_slot (cgraph_hash, node, INSERT);
560 /* Returns a hash code for P. */
563 hash_node_by_assembler_name (const void *p)
565 const struct cgraph_node *n = (const struct cgraph_node *) p;
566 return (hashval_t) decl_assembler_name_hash (DECL_ASSEMBLER_NAME (n->decl));
569 /* Returns nonzero if P1 and P2 are equal. */
572 eq_assembler_name (const void *p1, const void *p2)
574 const struct cgraph_node *n1 = (const struct cgraph_node *) p1;
575 const_tree name = (const_tree)p2;
576 return (decl_assembler_name_equal (n1->decl, name));
579 /* Return the cgraph node that has ASMNAME for its DECL_ASSEMBLER_NAME.
580 Return NULL if there's no such node. */
583 cgraph_node_for_asm (tree asmname)
585 struct cgraph_node *node;
588 if (!assembler_name_hash)
590 assembler_name_hash =
591 htab_create_ggc (10, hash_node_by_assembler_name, eq_assembler_name,
593 for (node = cgraph_nodes; node; node = node->next)
594 if (!node->global.inlined_to)
596 tree name = DECL_ASSEMBLER_NAME (node->decl);
597 slot = htab_find_slot_with_hash (assembler_name_hash, name,
598 decl_assembler_name_hash (name),
600 /* We can have multiple declarations with same assembler name. For C++
601 it is __builtin_strlen and strlen, for instance. Do we need to
602 record them all? Original implementation marked just first one
603 so lets hope for the best. */
610 slot = htab_find_slot_with_hash (assembler_name_hash, asmname,
611 decl_assembler_name_hash (asmname),
615 return (struct cgraph_node *) *slot;
619 /* Returns a hash value for X (which really is a die_struct). */
622 edge_hash (const void *x)
624 return htab_hash_pointer (((const struct cgraph_edge *) x)->call_stmt);
627 /* Return nonzero if decl_id of die_struct X is the same as UID of decl *Y. */
630 edge_eq (const void *x, const void *y)
632 return ((const struct cgraph_edge *) x)->call_stmt == y;
636 /* Return the callgraph edge representing the GIMPLE_CALL statement
640 cgraph_edge (struct cgraph_node *node, gimple call_stmt)
642 struct cgraph_edge *e, *e2;
645 if (node->call_site_hash)
646 return (struct cgraph_edge *)
647 htab_find_with_hash (node->call_site_hash, call_stmt,
648 htab_hash_pointer (call_stmt));
650 /* This loop may turn out to be performance problem. In such case adding
651 hashtables into call nodes with very many edges is probably best
652 solution. It is not good idea to add pointer into CALL_EXPR itself
653 because we want to make possible having multiple cgraph nodes representing
654 different clones of the same body before the body is actually cloned. */
655 for (e = node->callees; e; e= e->next_callee)
657 if (e->call_stmt == call_stmt)
664 node->call_site_hash = htab_create_ggc (120, edge_hash, edge_eq, NULL);
665 for (e2 = node->callees; e2; e2 = e2->next_callee)
668 slot = htab_find_slot_with_hash (node->call_site_hash,
670 htab_hash_pointer (e2->call_stmt),
681 /* Change field call_stmt of edge E to NEW_STMT. */
684 cgraph_set_call_stmt (struct cgraph_edge *e, gimple new_stmt)
686 if (e->caller->call_site_hash)
688 htab_remove_elt_with_hash (e->caller->call_site_hash,
690 htab_hash_pointer (e->call_stmt));
692 e->call_stmt = new_stmt;
693 push_cfun (DECL_STRUCT_FUNCTION (e->caller->decl));
694 e->can_throw_external = stmt_can_throw_external (new_stmt);
696 if (e->caller->call_site_hash)
699 slot = htab_find_slot_with_hash (e->caller->call_site_hash,
702 (e->call_stmt), INSERT);
708 /* Like cgraph_set_call_stmt but walk the clone tree and update all
709 clones sharing the same function body. */
712 cgraph_set_call_stmt_including_clones (struct cgraph_node *orig,
713 gimple old_stmt, gimple new_stmt)
715 struct cgraph_node *node;
716 struct cgraph_edge *edge = cgraph_edge (orig, old_stmt);
719 cgraph_set_call_stmt (edge, new_stmt);
725 struct cgraph_edge *edge = cgraph_edge (node, old_stmt);
727 cgraph_set_call_stmt (edge, new_stmt);
730 else if (node->next_sibling_clone)
731 node = node->next_sibling_clone;
734 while (node != orig && !node->next_sibling_clone)
735 node = node->clone_of;
737 node = node->next_sibling_clone;
742 /* Like cgraph_create_edge walk the clone tree and update all clones sharing
745 TODO: COUNT and LOOP_DEPTH should be properly distributed based on relative
746 frequencies of the clones. */
749 cgraph_create_edge_including_clones (struct cgraph_node *orig,
750 struct cgraph_node *callee,
751 gimple stmt, gcov_type count,
752 int freq, int loop_depth,
753 cgraph_inline_failed_t reason)
755 struct cgraph_node *node;
756 struct cgraph_edge *edge;
758 if (!cgraph_edge (orig, stmt))
760 edge = cgraph_create_edge (orig, callee, stmt, count, freq, loop_depth);
761 edge->inline_failed = reason;
768 /* It is possible that we already constant propagated into the clone
769 and turned indirect call into dirrect call. */
770 if (!cgraph_edge (node, stmt))
772 edge = cgraph_create_edge (node, callee, stmt, count,
774 edge->inline_failed = reason;
779 else if (node->next_sibling_clone)
780 node = node->next_sibling_clone;
783 while (node != orig && !node->next_sibling_clone)
784 node = node->clone_of;
786 node = node->next_sibling_clone;
791 /* Give initial reasons why inlining would fail on EDGE. This gets either
792 nullified or usually overwritten by more precise reasons later. */
795 initialize_inline_failed (struct cgraph_edge *e)
797 struct cgraph_node *callee = e->callee;
799 if (!callee->analyzed)
800 e->inline_failed = CIF_BODY_NOT_AVAILABLE;
801 else if (callee->local.redefined_extern_inline)
802 e->inline_failed = CIF_REDEFINED_EXTERN_INLINE;
803 else if (!callee->local.inlinable)
804 e->inline_failed = CIF_FUNCTION_NOT_INLINABLE;
805 else if (e->call_stmt && gimple_call_cannot_inline_p (e->call_stmt))
806 e->inline_failed = CIF_MISMATCHED_ARGUMENTS;
808 e->inline_failed = CIF_FUNCTION_NOT_CONSIDERED;
811 /* Create edge from CALLER to CALLEE in the cgraph. */
814 cgraph_create_edge (struct cgraph_node *caller, struct cgraph_node *callee,
815 gimple call_stmt, gcov_type count, int freq, int nest)
817 struct cgraph_edge *edge;
820 /* LTO does not actually have access to the call_stmt since these
821 have not been loaded yet. */
824 #ifdef ENABLE_CHECKING
825 /* This is rather pricely check possibly trigerring construction of call stmt
827 gcc_assert (!cgraph_edge (caller, call_stmt));
830 gcc_assert (is_gimple_call (call_stmt));
836 free_edges = NEXT_FREE_EDGE (edge);
840 edge = GGC_NEW (struct cgraph_edge);
841 edge->uid = cgraph_edge_max_uid++;
846 edge->caller = caller;
847 edge->callee = callee;
848 edge->call_stmt = call_stmt;
849 push_cfun (DECL_STRUCT_FUNCTION (caller->decl));
850 edge->can_throw_external = stmt_can_throw_external (call_stmt);
852 edge->prev_caller = NULL;
853 edge->next_caller = callee->callers;
855 callee->callers->prev_caller = edge;
856 edge->prev_callee = NULL;
857 edge->next_callee = caller->callees;
859 caller->callees->prev_callee = edge;
860 caller->callees = edge;
861 callee->callers = edge;
863 gcc_assert (count >= 0);
864 edge->frequency = freq;
865 gcc_assert (freq >= 0);
866 gcc_assert (freq <= CGRAPH_FREQ_MAX);
867 edge->loop_nest = nest;
868 edge->indirect_call = 0;
869 edge->call_stmt_cannot_inline_p =
870 (call_stmt ? gimple_call_cannot_inline_p (call_stmt) : false);
871 if (call_stmt && caller->call_site_hash)
874 slot = htab_find_slot_with_hash (caller->call_site_hash,
883 initialize_inline_failed (edge);
888 /* Remove the edge E from the list of the callers of the callee. */
891 cgraph_edge_remove_callee (struct cgraph_edge *e)
894 e->prev_caller->next_caller = e->next_caller;
896 e->next_caller->prev_caller = e->prev_caller;
898 e->callee->callers = e->next_caller;
901 /* Remove the edge E from the list of the callees of the caller. */
904 cgraph_edge_remove_caller (struct cgraph_edge *e)
907 e->prev_callee->next_callee = e->next_callee;
909 e->next_callee->prev_callee = e->prev_callee;
911 e->caller->callees = e->next_callee;
912 if (e->caller->call_site_hash)
913 htab_remove_elt_with_hash (e->caller->call_site_hash,
915 htab_hash_pointer (e->call_stmt));
918 /* Put the edge onto the free list. */
921 cgraph_free_edge (struct cgraph_edge *e)
925 /* Clear out the edge so we do not dangle pointers. */
926 memset (e, 0, sizeof (*e));
928 NEXT_FREE_EDGE (e) = free_edges;
932 /* Remove the edge E in the cgraph. */
935 cgraph_remove_edge (struct cgraph_edge *e)
937 /* Call all edge removal hooks. */
938 cgraph_call_edge_removal_hooks (e);
940 /* Remove from callers list of the callee. */
941 cgraph_edge_remove_callee (e);
943 /* Remove from callees list of the callers. */
944 cgraph_edge_remove_caller (e);
946 /* Put the edge onto the free list. */
947 cgraph_free_edge (e);
950 /* Redirect callee of E to N. The function does not update underlying
954 cgraph_redirect_edge_callee (struct cgraph_edge *e, struct cgraph_node *n)
956 /* Remove from callers list of the current callee. */
957 cgraph_edge_remove_callee (e);
959 /* Insert to callers list of the new callee. */
960 e->prev_caller = NULL;
962 n->callers->prev_caller = e;
963 e->next_caller = n->callers;
969 /* Update or remove the corresponding cgraph edge if a GIMPLE_CALL
970 OLD_STMT changed into NEW_STMT. OLD_CALL is gimple_call_fndecl
971 of OLD_STMT if it was previously call statement. */
974 cgraph_update_edges_for_call_stmt_node (struct cgraph_node *node,
975 gimple old_stmt, tree old_call, gimple new_stmt)
977 tree new_call = (is_gimple_call (new_stmt)) ? gimple_call_fndecl (new_stmt) : 0;
979 /* We are seeing indirect calls, then there is nothing to update. */
980 if (!new_call && !old_call)
982 /* See if we turned indirect call into direct call or folded call to one builtin
983 into different bultin. */
984 if (old_call != new_call)
986 struct cgraph_edge *e = cgraph_edge (node, old_stmt);
987 struct cgraph_edge *ne = NULL;
994 /* See if the call is already there. It might be because of indirect
995 inlining already found it. */
996 if (new_call && e->callee->decl == new_call)
999 /* Otherwise remove edge and create new one; we can't simply redirect
1000 since function has changed, so inline plan and other information
1001 attached to edge is invalid. */
1002 cgraph_remove_edge (e);
1004 frequency = e->frequency;
1005 loop_nest = e->loop_nest;
1009 /* We are seeing new direct call; compute profile info based on BB. */
1010 basic_block bb = gimple_bb (new_stmt);
1012 frequency = compute_call_stmt_bb_frequency (current_function_decl,
1014 loop_nest = bb->loop_depth;
1019 ne = cgraph_create_edge (node, cgraph_node (new_call),
1020 new_stmt, count, frequency,
1022 gcc_assert (ne->inline_failed);
1025 /* We only updated the call stmt; update pointer in cgraph edge.. */
1026 else if (old_stmt != new_stmt)
1027 cgraph_set_call_stmt (cgraph_edge (node, old_stmt), new_stmt);
1030 /* Update or remove the corresponding cgraph edge if a GIMPLE_CALL
1031 OLD_STMT changed into NEW_STMT. OLD_DECL is gimple_call_fndecl
1032 of OLD_STMT before it was updated (updating can happen inplace). */
1035 cgraph_update_edges_for_call_stmt (gimple old_stmt, tree old_decl, gimple new_stmt)
1037 struct cgraph_node *orig = cgraph_node (cfun->decl);
1038 struct cgraph_node *node;
1040 cgraph_update_edges_for_call_stmt_node (orig, old_stmt, old_decl, new_stmt);
1042 for (node = orig->clones; node != orig;)
1044 cgraph_update_edges_for_call_stmt_node (node, old_stmt, old_decl, new_stmt);
1046 node = node->clones;
1047 else if (node->next_sibling_clone)
1048 node = node->next_sibling_clone;
1051 while (node != orig && !node->next_sibling_clone)
1052 node = node->clone_of;
1054 node = node->next_sibling_clone;
1060 /* Remove all callees from the node. */
1063 cgraph_node_remove_callees (struct cgraph_node *node)
1065 struct cgraph_edge *e, *f;
1067 /* It is sufficient to remove the edges from the lists of callers of
1068 the callees. The callee list of the node can be zapped with one
1070 for (e = node->callees; e; e = f)
1073 cgraph_call_edge_removal_hooks (e);
1074 cgraph_edge_remove_callee (e);
1075 cgraph_free_edge (e);
1077 node->callees = NULL;
1078 if (node->call_site_hash)
1080 htab_delete (node->call_site_hash);
1081 node->call_site_hash = NULL;
1085 /* Remove all callers from the node. */
1088 cgraph_node_remove_callers (struct cgraph_node *node)
1090 struct cgraph_edge *e, *f;
1092 /* It is sufficient to remove the edges from the lists of callees of
1093 the callers. The caller list of the node can be zapped with one
1095 for (e = node->callers; e; e = f)
1098 cgraph_call_edge_removal_hooks (e);
1099 cgraph_edge_remove_caller (e);
1100 cgraph_free_edge (e);
1102 node->callers = NULL;
1105 /* Release memory used to represent body of function NODE. */
1108 cgraph_release_function_body (struct cgraph_node *node)
1110 if (DECL_STRUCT_FUNCTION (node->decl))
1112 tree old_decl = current_function_decl;
1113 push_cfun (DECL_STRUCT_FUNCTION (node->decl));
1114 if (cfun->gimple_df)
1116 current_function_decl = node->decl;
1118 delete_tree_cfg_annotations ();
1120 current_function_decl = old_decl;
1124 gcc_assert (dom_computed[0] == DOM_NONE);
1125 gcc_assert (dom_computed[1] == DOM_NONE);
1128 if (cfun->value_histograms)
1130 gcc_assert (!current_loops);
1132 gimple_set_body (node->decl, NULL);
1133 VEC_free (ipa_opt_pass, heap,
1134 DECL_STRUCT_FUNCTION (node->decl)->ipa_transforms_to_apply);
1135 /* Struct function hangs a lot of data that would leak if we didn't
1136 removed all pointers to it. */
1137 ggc_free (DECL_STRUCT_FUNCTION (node->decl));
1138 DECL_STRUCT_FUNCTION (node->decl) = NULL;
1140 DECL_SAVED_TREE (node->decl) = NULL;
1141 /* If the node is abstract and needed, then do not clear DECL_INITIAL
1142 of its associated function function declaration because it's
1143 needed to emit debug info later. */
1144 if (!node->abstract_and_needed)
1145 DECL_INITIAL (node->decl) = error_mark_node;
1148 /* Remove the node from cgraph. */
1151 cgraph_remove_node (struct cgraph_node *node)
1154 bool kill_body = false;
1155 struct cgraph_node *n;
1156 int uid = node->uid;
1158 cgraph_call_node_removal_hooks (node);
1159 cgraph_node_remove_callers (node);
1160 cgraph_node_remove_callees (node);
1162 /* Incremental inlining access removed nodes stored in the postorder list.
1164 node->needed = node->reachable = false;
1165 for (n = node->nested; n; n = n->next_nested)
1167 node->nested = NULL;
1170 struct cgraph_node **node2 = &node->origin->nested;
1172 while (*node2 != node)
1173 node2 = &(*node2)->next_nested;
1174 *node2 = node->next_nested;
1177 node->previous->next = node->next;
1179 cgraph_nodes = node->next;
1181 node->next->previous = node->previous;
1183 node->previous = NULL;
1184 slot = htab_find_slot (cgraph_hash, node, NO_INSERT);
1187 struct cgraph_node *next_inline_clone;
1189 for (next_inline_clone = node->clones;
1190 next_inline_clone && next_inline_clone->decl != node->decl;
1191 next_inline_clone = next_inline_clone->next_sibling_clone)
1194 /* If there is inline clone of the node being removed, we need
1195 to put it into the position of removed node and reorganize all
1196 other clones to be based on it. */
1197 if (next_inline_clone)
1199 struct cgraph_node *n;
1200 struct cgraph_node *new_clones;
1202 *slot = next_inline_clone;
1204 /* Unlink inline clone from the list of clones of removed node. */
1205 if (next_inline_clone->next_sibling_clone)
1206 next_inline_clone->next_sibling_clone->prev_sibling_clone
1207 = next_inline_clone->prev_sibling_clone;
1208 if (next_inline_clone->prev_sibling_clone)
1210 next_inline_clone->prev_sibling_clone->next_sibling_clone
1211 = next_inline_clone->next_sibling_clone;
1214 node->clones = next_inline_clone->next_sibling_clone;
1216 new_clones = node->clones;
1217 node->clones = NULL;
1219 /* Copy clone info. */
1220 next_inline_clone->clone = node->clone;
1222 /* Now place it into clone tree at same level at NODE. */
1223 next_inline_clone->clone_of = node->clone_of;
1224 next_inline_clone->prev_sibling_clone = NULL;
1225 next_inline_clone->next_sibling_clone = NULL;
1228 next_inline_clone->next_sibling_clone = node->clone_of->clones;
1229 node->clone_of->clones = next_inline_clone;
1232 /* Merge the clone list. */
1235 if (!next_inline_clone->clones)
1236 next_inline_clone->clones = new_clones;
1239 n = next_inline_clone->clones;
1240 while (n->next_sibling_clone)
1241 n = n->next_sibling_clone;
1242 n->next_sibling_clone = new_clones;
1243 new_clones->prev_sibling_clone = n;
1247 /* Update clone_of pointers. */
1251 n->clone_of = next_inline_clone;
1252 n = n->next_sibling_clone;
1257 htab_clear_slot (cgraph_hash, slot);
1263 gcc_assert (node->clone_of);
1264 if (node->prev_sibling_clone)
1265 node->prev_sibling_clone->next_sibling_clone = node->next_sibling_clone;
1266 else if (node->clone_of)
1267 node->clone_of->clones = node->next_sibling_clone;
1268 if (node->next_sibling_clone)
1269 node->next_sibling_clone->prev_sibling_clone = node->prev_sibling_clone;
1272 struct cgraph_node *n;
1274 for (n = node->clones; n->next_sibling_clone; n = n->next_sibling_clone)
1275 n->clone_of = node->clone_of;
1276 n->clone_of = node->clone_of;
1277 n->next_sibling_clone = node->clone_of->clones;
1278 if (node->clone_of->clones)
1279 node->clone_of->clones->prev_sibling_clone = n;
1280 node->clone_of->clones = node->clones;
1283 /* While all the clones are removed after being proceeded, the function
1284 itself is kept in the cgraph even after it is compiled. Check whether
1285 we are done with this body and reclaim it proactively if this is the case.
1287 if (!kill_body && *slot)
1289 struct cgraph_node *n = (struct cgraph_node *) *slot;
1290 if (!n->clones && !n->clone_of && !n->global.inlined_to
1291 && (cgraph_global_info_ready
1292 && (TREE_ASM_WRITTEN (n->decl) || DECL_EXTERNAL (n->decl))))
1295 if (assembler_name_hash)
1297 tree name = DECL_ASSEMBLER_NAME (node->decl);
1298 slot = htab_find_slot_with_hash (assembler_name_hash, name,
1299 decl_assembler_name_hash (name),
1301 /* Inline clones are not hashed. */
1302 if (slot && *slot == node)
1303 htab_clear_slot (assembler_name_hash, slot);
1307 cgraph_release_function_body (node);
1309 if (node->call_site_hash)
1311 htab_delete (node->call_site_hash);
1312 node->call_site_hash = NULL;
1316 /* Clear out the node to NULL all pointers and add the node to the free
1318 memset (node, 0, sizeof(*node));
1320 NEXT_FREE_NODE (node) = free_nodes;
1324 /* Remove the node from cgraph. */
1327 cgraph_remove_node_and_inline_clones (struct cgraph_node *node)
1329 struct cgraph_edge *e, *next;
1330 for (e = node->callees; e; e = next)
1332 next = e->next_callee;
1333 if (!e->inline_failed)
1334 cgraph_remove_node_and_inline_clones (e->callee);
1336 cgraph_remove_node (node);
1339 /* Notify finalize_compilation_unit that given node is reachable. */
1342 cgraph_mark_reachable_node (struct cgraph_node *node)
1344 if (!node->reachable && node->local.finalized)
1346 notice_global_symbol (node->decl);
1347 node->reachable = 1;
1348 gcc_assert (!cgraph_global_info_ready);
1350 node->next_needed = cgraph_nodes_queue;
1351 cgraph_nodes_queue = node;
1355 /* Likewise indicate that a node is needed, i.e. reachable via some
1359 cgraph_mark_needed_node (struct cgraph_node *node)
1362 cgraph_mark_reachable_node (node);
1365 /* Likewise indicate that a node is having address taken. */
1368 cgraph_mark_address_taken_node (struct cgraph_node *node)
1370 node->address_taken = 1;
1371 cgraph_mark_needed_node (node);
1374 /* Return local info for the compiled function. */
1376 struct cgraph_local_info *
1377 cgraph_local_info (tree decl)
1379 struct cgraph_node *node;
1381 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL);
1382 node = cgraph_node (decl);
1383 return &node->local;
1386 /* Return local info for the compiled function. */
1388 struct cgraph_global_info *
1389 cgraph_global_info (tree decl)
1391 struct cgraph_node *node;
1393 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL && cgraph_global_info_ready);
1394 node = cgraph_node (decl);
1395 return &node->global;
1398 /* Return local info for the compiled function. */
1400 struct cgraph_rtl_info *
1401 cgraph_rtl_info (tree decl)
1403 struct cgraph_node *node;
1405 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL);
1406 node = cgraph_node (decl);
1407 if (decl != current_function_decl
1408 && !TREE_ASM_WRITTEN (node->decl))
1413 /* Return a string describing the failure REASON. */
1416 cgraph_inline_failed_string (cgraph_inline_failed_t reason)
1419 #define DEFCIFCODE(code, string) string,
1421 static const char *cif_string_table[CIF_N_REASONS] = {
1422 #include "cif-code.def"
1425 /* Signedness of an enum type is implementation defined, so cast it
1426 to unsigned before testing. */
1427 gcc_assert ((unsigned) reason < CIF_N_REASONS);
1428 return cif_string_table[reason];
1431 /* Return name of the node used in debug output. */
1433 cgraph_node_name (struct cgraph_node *node)
1435 return lang_hooks.decl_printable_name (node->decl, 2);
1438 /* Names used to print out the availability enum. */
1439 const char * const cgraph_availability_names[] =
1440 {"unset", "not_available", "overwritable", "available", "local"};
1443 /* Dump call graph node NODE to file F. */
1446 dump_cgraph_node (FILE *f, struct cgraph_node *node)
1448 struct cgraph_edge *edge;
1449 fprintf (f, "%s/%i(%i)", cgraph_node_name (node), node->uid,
1451 dump_addr (f, " @", (void *)node);
1452 if (node->global.inlined_to)
1453 fprintf (f, " (inline copy in %s/%i)",
1454 cgraph_node_name (node->global.inlined_to),
1455 node->global.inlined_to->uid);
1457 fprintf (f, " (clone of %s/%i)",
1458 cgraph_node_name (node->clone_of),
1459 node->clone_of->uid);
1460 if (cgraph_function_flags_ready)
1461 fprintf (f, " availability:%s",
1462 cgraph_availability_names [cgraph_function_body_availability (node)]);
1464 fprintf (f, " executed "HOST_WIDEST_INT_PRINT_DEC"x",
1465 (HOST_WIDEST_INT)node->count);
1466 if (node->local.inline_summary.self_time)
1467 fprintf (f, " %i time, %i benefit", node->local.inline_summary.self_time,
1468 node->local.inline_summary.time_inlining_benefit);
1469 if (node->global.time && node->global.time
1470 != node->local.inline_summary.self_time)
1471 fprintf (f, " (%i after inlining)", node->global.time);
1472 if (node->local.inline_summary.self_size)
1473 fprintf (f, " %i size, %i benefit", node->local.inline_summary.self_size,
1474 node->local.inline_summary.size_inlining_benefit);
1475 if (node->global.size && node->global.size
1476 != node->local.inline_summary.self_size)
1477 fprintf (f, " (%i after inlining)", node->global.size);
1478 if (node->local.inline_summary.estimated_self_stack_size)
1479 fprintf (f, " %i bytes stack usage", (int)node->local.inline_summary.estimated_self_stack_size);
1480 if (node->global.estimated_stack_size != node->local.inline_summary.estimated_self_stack_size)
1481 fprintf (f, " %i bytes after inlining", (int)node->global.estimated_stack_size);
1483 fprintf (f, " nested in: %s", cgraph_node_name (node->origin));
1485 fprintf (f, " needed");
1486 if (node->address_taken)
1487 fprintf (f, " address_taken");
1488 else if (node->reachable)
1489 fprintf (f, " reachable");
1490 if (gimple_has_body_p (node->decl))
1491 fprintf (f, " body");
1493 fprintf (f, " process");
1494 if (node->local.local)
1495 fprintf (f, " local");
1496 if (node->local.externally_visible)
1497 fprintf (f, " externally_visible");
1498 if (node->local.finalized)
1499 fprintf (f, " finalized");
1500 if (node->local.disregard_inline_limits)
1501 fprintf (f, " always_inline");
1502 else if (node->local.inlinable)
1503 fprintf (f, " inlinable");
1504 if (node->local.redefined_extern_inline)
1505 fprintf (f, " redefined_extern_inline");
1506 if (TREE_ASM_WRITTEN (node->decl))
1507 fprintf (f, " asm_written");
1509 fprintf (f, "\n called by: ");
1510 for (edge = node->callers; edge; edge = edge->next_caller)
1512 fprintf (f, "%s/%i ", cgraph_node_name (edge->caller),
1515 fprintf (f, "("HOST_WIDEST_INT_PRINT_DEC"x) ",
1516 (HOST_WIDEST_INT)edge->count);
1517 if (edge->frequency)
1518 fprintf (f, "(%.2f per call) ",
1519 edge->frequency / (double)CGRAPH_FREQ_BASE);
1520 if (!edge->inline_failed)
1521 fprintf(f, "(inlined) ");
1522 if (edge->indirect_call)
1523 fprintf(f, "(indirect) ");
1524 if (edge->can_throw_external)
1525 fprintf(f, "(can throw external) ");
1528 fprintf (f, "\n calls: ");
1529 for (edge = node->callees; edge; edge = edge->next_callee)
1531 fprintf (f, "%s/%i ", cgraph_node_name (edge->callee),
1533 if (!edge->inline_failed)
1534 fprintf(f, "(inlined) ");
1535 if (edge->indirect_call)
1536 fprintf(f, "(indirect) ");
1538 fprintf (f, "("HOST_WIDEST_INT_PRINT_DEC"x) ",
1539 (HOST_WIDEST_INT)edge->count);
1540 if (edge->frequency)
1541 fprintf (f, "(%.2f per call) ",
1542 edge->frequency / (double)CGRAPH_FREQ_BASE);
1543 if (edge->loop_nest)
1544 fprintf (f, "(nested in %i loops) ", edge->loop_nest);
1545 if (edge->can_throw_external)
1546 fprintf(f, "(can throw external) ");
1552 /* Dump call graph node NODE to stderr. */
1555 debug_cgraph_node (struct cgraph_node *node)
1557 dump_cgraph_node (stderr, node);
1561 /* Dump the callgraph to file F. */
1564 dump_cgraph (FILE *f)
1566 struct cgraph_node *node;
1568 fprintf (f, "callgraph:\n\n");
1569 for (node = cgraph_nodes; node; node = node->next)
1570 dump_cgraph_node (f, node);
1574 /* Dump the call graph to stderr. */
1579 dump_cgraph (stderr);
1583 /* Set the DECL_ASSEMBLER_NAME and update cgraph hashtables. */
1586 change_decl_assembler_name (tree decl, tree name)
1588 gcc_assert (!assembler_name_hash);
1589 if (!DECL_ASSEMBLER_NAME_SET_P (decl))
1591 SET_DECL_ASSEMBLER_NAME (decl, name);
1594 if (name == DECL_ASSEMBLER_NAME (decl))
1597 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
1598 && DECL_RTL_SET_P (decl))
1599 warning (0, "%D renamed after being referenced in assembly", decl);
1601 SET_DECL_ASSEMBLER_NAME (decl, name);
1604 /* Add a top-level asm statement to the list. */
1606 struct cgraph_asm_node *
1607 cgraph_add_asm_node (tree asm_str)
1609 struct cgraph_asm_node *node;
1611 node = GGC_CNEW (struct cgraph_asm_node);
1612 node->asm_str = asm_str;
1613 node->order = cgraph_order++;
1615 if (cgraph_asm_nodes == NULL)
1616 cgraph_asm_nodes = node;
1618 cgraph_asm_last_node->next = node;
1619 cgraph_asm_last_node = node;
1623 /* Return true when the DECL can possibly be inlined. */
1625 cgraph_function_possibly_inlined_p (tree decl)
1627 if (!cgraph_global_info_ready)
1628 return !DECL_UNINLINABLE (decl);
1629 return DECL_POSSIBLY_INLINED (decl);
1632 /* Create clone of E in the node N represented by CALL_EXPR the callgraph. */
1633 struct cgraph_edge *
1634 cgraph_clone_edge (struct cgraph_edge *e, struct cgraph_node *n,
1635 gimple call_stmt, unsigned stmt_uid, gcov_type count_scale,
1636 int freq_scale, int loop_nest, bool update_original)
1638 struct cgraph_edge *new_edge;
1639 gcov_type count = e->count * count_scale / REG_BR_PROB_BASE;
1640 gcov_type freq = e->frequency * (gcov_type) freq_scale / CGRAPH_FREQ_BASE;
1642 if (freq > CGRAPH_FREQ_MAX)
1643 freq = CGRAPH_FREQ_MAX;
1644 new_edge = cgraph_create_edge (n, e->callee, call_stmt, count, freq,
1645 e->loop_nest + loop_nest);
1647 new_edge->inline_failed = e->inline_failed;
1648 new_edge->indirect_call = e->indirect_call;
1649 new_edge->lto_stmt_uid = stmt_uid;
1650 if (update_original)
1652 e->count -= new_edge->count;
1656 cgraph_call_edge_duplication_hooks (e, new_edge);
1660 /* Create node representing clone of N executed COUNT times. Decrease
1661 the execution counts from original node too.
1663 When UPDATE_ORIGINAL is true, the counts are subtracted from the original
1664 function's profile to reflect the fact that part of execution is handled
1666 struct cgraph_node *
1667 cgraph_clone_node (struct cgraph_node *n, gcov_type count, int freq,
1668 int loop_nest, bool update_original,
1669 VEC(cgraph_edge_p,heap) *redirect_callers)
1671 struct cgraph_node *new_node = cgraph_create_node ();
1672 struct cgraph_edge *e;
1673 gcov_type count_scale;
1676 new_node->decl = n->decl;
1677 new_node->origin = n->origin;
1678 if (new_node->origin)
1680 new_node->next_nested = new_node->origin->nested;
1681 new_node->origin->nested = new_node;
1683 new_node->analyzed = n->analyzed;
1684 new_node->local = n->local;
1685 new_node->global = n->global;
1686 new_node->rtl = n->rtl;
1687 new_node->count = count;
1688 new_node->clone = n->clone;
1691 if (new_node->count > n->count)
1692 count_scale = REG_BR_PROB_BASE;
1694 count_scale = new_node->count * REG_BR_PROB_BASE / n->count;
1698 if (update_original)
1705 for (i = 0; VEC_iterate (cgraph_edge_p, redirect_callers, i, e); i++)
1707 /* Redirect calls to the old version node to point to its new
1709 cgraph_redirect_edge_callee (e, new_node);
1713 for (e = n->callees;e; e=e->next_callee)
1714 cgraph_clone_edge (e, new_node, e->call_stmt, e->lto_stmt_uid,
1715 count_scale, freq, loop_nest, update_original);
1717 new_node->next_sibling_clone = n->clones;
1719 n->clones->prev_sibling_clone = new_node;
1720 n->clones = new_node;
1721 new_node->clone_of = n;
1723 cgraph_call_node_duplication_hooks (n, new_node);
1727 /* Create a new name for omp child function. Returns an identifier. */
1729 static GTY(()) unsigned int clone_fn_id_num;
1732 clone_function_name (tree decl)
1734 tree name = DECL_ASSEMBLER_NAME (decl);
1735 size_t len = IDENTIFIER_LENGTH (name);
1736 char *tmp_name, *prefix;
1738 prefix = XALLOCAVEC (char, len + strlen ("_clone") + 1);
1739 memcpy (prefix, IDENTIFIER_POINTER (name), len);
1740 strcpy (prefix + len, "_clone");
1741 #ifndef NO_DOT_IN_LABEL
1743 #elif !defined NO_DOLLAR_IN_LABEL
1746 ASM_FORMAT_PRIVATE_NAME (tmp_name, prefix, clone_fn_id_num++);
1747 return get_identifier (tmp_name);
1750 /* Create callgraph node clone with new declaration. The actual body will
1751 be copied later at compilation stage.
1753 TODO: after merging in ipa-sra use function call notes instead of args_to_skip
1756 struct cgraph_node *
1757 cgraph_create_virtual_clone (struct cgraph_node *old_node,
1758 VEC(cgraph_edge_p,heap) *redirect_callers,
1759 VEC(ipa_replace_map_p,gc) *tree_map,
1760 bitmap args_to_skip)
1762 tree old_decl = old_node->decl;
1763 struct cgraph_node *new_node = NULL;
1765 struct cgraph_node key, **slot;
1767 gcc_assert (tree_versionable_function_p (old_decl));
1769 /* Make a new FUNCTION_DECL tree node */
1771 new_decl = copy_node (old_decl);
1773 new_decl = build_function_decl_skip_args (old_decl, args_to_skip);
1774 DECL_STRUCT_FUNCTION (new_decl) = NULL;
1776 /* Generate a new name for the new version. */
1777 DECL_NAME (new_decl) = clone_function_name (old_decl);
1778 SET_DECL_ASSEMBLER_NAME (new_decl, DECL_NAME (new_decl));
1779 SET_DECL_RTL (new_decl, NULL);
1781 new_node = cgraph_clone_node (old_node, old_node->count,
1782 CGRAPH_FREQ_BASE, 0, false,
1784 new_node->decl = new_decl;
1785 /* Update the properties.
1786 Make clone visible only within this translation unit. Make sure
1787 that is not weak also.
1788 ??? We cannot use COMDAT linkage because there is no
1789 ABI support for this. */
1790 DECL_EXTERNAL (new_node->decl) = 0;
1791 DECL_COMDAT_GROUP (new_node->decl) = 0;
1792 TREE_PUBLIC (new_node->decl) = 0;
1793 DECL_COMDAT (new_node->decl) = 0;
1794 DECL_WEAK (new_node->decl) = 0;
1795 new_node->clone.tree_map = tree_map;
1796 new_node->clone.args_to_skip = args_to_skip;
1798 new_node->clone.combined_args_to_skip = old_node->clone.combined_args_to_skip;
1799 else if (old_node->clone.combined_args_to_skip)
1801 int newi = 0, oldi = 0;
1803 bitmap new_args_to_skip = BITMAP_GGC_ALLOC ();
1804 struct cgraph_node *orig_node;
1805 for (orig_node = old_node; orig_node->clone_of; orig_node = orig_node->clone_of)
1807 for (arg = DECL_ARGUMENTS (orig_node->decl); arg; arg = TREE_CHAIN (arg), oldi++)
1809 if (bitmap_bit_p (old_node->clone.combined_args_to_skip, oldi))
1811 bitmap_set_bit (new_args_to_skip, oldi);
1814 if (bitmap_bit_p (args_to_skip, newi))
1815 bitmap_set_bit (new_args_to_skip, oldi);
1818 new_node->clone.combined_args_to_skip = new_args_to_skip;
1821 new_node->clone.combined_args_to_skip = args_to_skip;
1822 new_node->local.externally_visible = 0;
1823 new_node->local.local = 1;
1824 new_node->lowered = true;
1825 new_node->reachable = true;
1827 key.decl = new_decl;
1828 slot = (struct cgraph_node **) htab_find_slot (cgraph_hash, &key, INSERT);
1829 gcc_assert (!*slot);
1831 if (assembler_name_hash)
1834 tree name = DECL_ASSEMBLER_NAME (new_decl);
1836 aslot = htab_find_slot_with_hash (assembler_name_hash, name,
1837 decl_assembler_name_hash (name),
1839 gcc_assert (!*aslot);
1846 /* NODE is no longer nested function; update cgraph accordingly. */
1848 cgraph_unnest_node (struct cgraph_node *node)
1850 struct cgraph_node **node2 = &node->origin->nested;
1851 gcc_assert (node->origin);
1853 while (*node2 != node)
1854 node2 = &(*node2)->next_nested;
1855 *node2 = node->next_nested;
1856 node->origin = NULL;
1859 /* Return function availability. See cgraph.h for description of individual
1862 cgraph_function_body_availability (struct cgraph_node *node)
1864 enum availability avail;
1865 gcc_assert (cgraph_function_flags_ready);
1866 if (!node->analyzed)
1867 avail = AVAIL_NOT_AVAILABLE;
1868 else if (node->local.local)
1869 avail = AVAIL_LOCAL;
1870 else if (!node->local.externally_visible)
1871 avail = AVAIL_AVAILABLE;
1872 /* Inline functions are safe to be analyzed even if their sybol can
1873 be overwritten at runtime. It is not meaningful to enfore any sane
1874 behaviour on replacing inline function by different body. */
1875 else if (DECL_DECLARED_INLINE_P (node->decl))
1876 avail = AVAIL_AVAILABLE;
1878 /* If the function can be overwritten, return OVERWRITABLE. Take
1879 care at least of two notable extensions - the COMDAT functions
1880 used to share template instantiations in C++ (this is symmetric
1881 to code cp_cannot_inline_tree_fn and probably shall be shared and
1882 the inlinability hooks completely eliminated).
1884 ??? Does the C++ one definition rule allow us to always return
1885 AVAIL_AVAILABLE here? That would be good reason to preserve this
1888 else if (DECL_REPLACEABLE_P (node->decl) && !DECL_EXTERNAL (node->decl))
1889 avail = AVAIL_OVERWRITABLE;
1890 else avail = AVAIL_AVAILABLE;
1895 /* Add the function FNDECL to the call graph.
1896 Unlike cgraph_finalize_function, this function is intended to be used
1897 by middle end and allows insertion of new function at arbitrary point
1898 of compilation. The function can be either in high, low or SSA form
1901 The function is assumed to be reachable and have address taken (so no
1902 API breaking optimizations are performed on it).
1904 Main work done by this function is to enqueue the function for later
1905 processing to avoid need the passes to be re-entrant. */
1908 cgraph_add_new_function (tree fndecl, bool lowered)
1910 struct cgraph_node *node;
1911 switch (cgraph_state)
1913 case CGRAPH_STATE_CONSTRUCTION:
1914 /* Just enqueue function to be processed at nearest occurrence. */
1915 node = cgraph_node (fndecl);
1916 node->next_needed = cgraph_new_nodes;
1918 node->lowered = true;
1919 cgraph_new_nodes = node;
1922 case CGRAPH_STATE_IPA:
1923 case CGRAPH_STATE_IPA_SSA:
1924 case CGRAPH_STATE_EXPANSION:
1925 /* Bring the function into finalized state and enqueue for later
1926 analyzing and compilation. */
1927 node = cgraph_node (fndecl);
1928 node->local.local = false;
1929 node->local.finalized = true;
1930 node->reachable = node->needed = true;
1931 if (!lowered && cgraph_state == CGRAPH_STATE_EXPANSION)
1933 push_cfun (DECL_STRUCT_FUNCTION (fndecl));
1934 current_function_decl = fndecl;
1935 gimple_register_cfg_hooks ();
1936 tree_lowering_passes (fndecl);
1937 bitmap_obstack_initialize (NULL);
1938 if (!gimple_in_ssa_p (DECL_STRUCT_FUNCTION (fndecl)))
1939 execute_pass_list (pass_early_local_passes.pass.sub);
1940 bitmap_obstack_release (NULL);
1942 current_function_decl = NULL;
1947 node->lowered = true;
1948 node->next_needed = cgraph_new_nodes;
1949 cgraph_new_nodes = node;
1952 case CGRAPH_STATE_FINISHED:
1953 /* At the very end of compilation we have to do all the work up
1955 push_cfun (DECL_STRUCT_FUNCTION (fndecl));
1956 current_function_decl = fndecl;
1957 gimple_register_cfg_hooks ();
1959 tree_lowering_passes (fndecl);
1960 bitmap_obstack_initialize (NULL);
1961 if (!gimple_in_ssa_p (DECL_STRUCT_FUNCTION (fndecl)))
1962 execute_pass_list (pass_early_local_passes.pass.sub);
1963 bitmap_obstack_release (NULL);
1964 tree_rest_of_compilation (fndecl);
1966 current_function_decl = NULL;
1970 /* Set a personality if required and we already passed EH lowering. */
1972 && (function_needs_eh_personality (DECL_STRUCT_FUNCTION (fndecl))
1973 == eh_personality_lang))
1974 DECL_FUNCTION_PERSONALITY (fndecl) = lang_hooks.eh_personality ();
1977 /* Return true if NODE can be made local for API change.
1978 Extern inline functions and C++ COMDAT functions can be made local
1979 at the expense of possible code size growth if function is used in multiple
1980 compilation units. */
1982 cgraph_node_can_be_local_p (struct cgraph_node *node)
1984 return !node->needed;
1987 /* Bring NODE local. */
1989 cgraph_make_node_local (struct cgraph_node *node)
1991 gcc_assert (cgraph_node_can_be_local_p (node));
1992 if (DECL_COMDAT (node->decl) || DECL_EXTERNAL (node->decl))
1994 DECL_COMDAT (node->decl) = 0;
1995 DECL_COMDAT_GROUP (node->decl) = 0;
1996 TREE_PUBLIC (node->decl) = 0;
1997 DECL_WEAK (node->decl) = 0;
1998 DECL_EXTERNAL (node->decl) = 0;
1999 node->local.externally_visible = false;
2000 node->local.local = true;
2001 gcc_assert (cgraph_function_body_availability (node) == AVAIL_LOCAL);
2005 #include "gt-cgraph.h"