gcc/cgraph.h

   1 /* Callgraph handling code.
   2    Copyright (C) 2003-2013 Free Software Foundation, Inc.
   3    Contributed by Jan Hubicka
   4
   5 This file is part of GCC.
   6
   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
  10 version.
  11
  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
  15 for more details.
  16
  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/>.  */
  20
  21 #ifndef GCC_CGRAPH_H
  22 #define GCC_CGRAPH_H
  23
  24 #include "is-a.h"
  25 #include "plugin-api.h"
  26 #include "vec.h"
  27 #include "tree.h"
  28 #include "basic-block.h"
  29 #include "function.h"
  30 #include "ipa-ref.h"
  31
  32 /* Symbol table consists of functions and variables.
  33    TODO: add labels, constant pool and aliases.  */
  34 enum symtab_type
  35 {
  36   SYMTAB_SYMBOL,
  37   SYMTAB_FUNCTION,
  38   SYMTAB_VARIABLE
  39 };
  40
  41 /* Base of all entries in the symbol table.
  42    The symtab_node is inherited by cgraph and varpol nodes.  */
  43 struct GTY(()) symtab_node_base
  44 {
  45   /* Type of the symbol.  */
  46   ENUM_BITFIELD (symtab_type) type : 8;
  47
  48   /* The symbols resolution.  */
  49   ENUM_BITFIELD (ld_plugin_symbol_resolution) resolution : 8;
  50
  51   /* Set when function has address taken.
  52      In current implementation it imply needed flag. */
  53   unsigned address_taken : 1;
  54   /* Set when variable is used from other LTRANS partition.  */
  55   unsigned used_from_other_partition : 1;
  56   /* Set when function is available in the other LTRANS partition.
  57      During WPA output it is used to mark nodes that are present in
  58      multiple partitions.  */
  59   unsigned in_other_partition : 1;
  60   /* Set when function is visible by other units.  */
  61   unsigned externally_visible : 1;
  62   /* Needed variables might become dead by optimization.  This flag
  63      forces the variable to be output even if it appears dead otherwise.  */
  64   unsigned force_output : 1;
  65   /* True when the name is known to be unique and thus it does not need mangling.  */
  66   unsigned unique_name : 1;
  67
  68   /* Ordering of all symtab entries.  */
  69   int order;
  70
  71   tree decl;
  72
  73   /* Vectors of referring and referenced entities.  */
  74   struct ipa_ref_list ref_list;
  75
  76   /* Circular list of nodes in the same comdat group if non-NULL.  */
  77   symtab_node same_comdat_group;
  78
  79   /* File stream where this node is being written to.  */
  80   struct lto_file_decl_data * lto_file_data;
  81
  82   /* Linked list of symbol table entries starting with symtab_nodes.  */
  83   symtab_node next;
  84   symtab_node previous;
  85   /* Linked list of symbols with the same asm name.  There may be multiple
  86      entries for single symbol name in the case of LTO resolutions,
  87      existence of inline clones, or duplicated declaration. The last case
  88      is a long standing bug frontends and builtin handling. */
  89   symtab_node next_sharing_asm_name;
  90   symtab_node previous_sharing_asm_name;
  91
  92   PTR GTY ((skip)) aux;
  93 };
  94
  95 enum availability
  96 {
  97   /* Not yet set by cgraph_function_body_availability.  */
  98   AVAIL_UNSET,
  99   /* Function body/variable initializer is unknown.  */
 100   AVAIL_NOT_AVAILABLE,
 101   /* Function body/variable initializer is known but might be replaced
 102      by a different one from other compilation unit and thus needs to
 103      be dealt with a care.  Like AVAIL_NOT_AVAILABLE it can have
 104      arbitrary side effects on escaping variables and functions, while
 105      like AVAILABLE it might access static variables.  */
 106   AVAIL_OVERWRITABLE,
 107   /* Function body/variable initializer is known and will be used in final
 108      program.  */
 109   AVAIL_AVAILABLE,
 110   /* Function body/variable initializer is known and all it's uses are explicitly
 111      visible within current unit (ie it's address is never taken and it is not
 112      exported to other units).
 113      Currently used only for functions.  */
 114   AVAIL_LOCAL
 115 };
 116
 117 /* This is the information that is put into the cgraph local structure
 118    to recover a function.  */
 119 struct lto_file_decl_data;
 120
 121 extern const char * const cgraph_availability_names[];
 122 extern const char * const ld_plugin_symbol_resolution_names[];
 123
 124 /* Information about thunk, used only for same body aliases.  */
 125
 126 struct GTY(()) cgraph_thunk_info {
 127   /* Information about the thunk.  */
 128   HOST_WIDE_INT fixed_offset;
 129   HOST_WIDE_INT virtual_value;
 130   tree alias;
 131   bool this_adjusting;
 132   bool virtual_offset_p;
 133   /* Set to true when alias node is thunk.  */
 134   bool thunk_p;
 135 };
 136
 137 /* Information about the function collected locally.
 138    Available after function is analyzed.  */
 139
 140 struct GTY(()) cgraph_local_info {
 141   /* Set when function function is visible in current compilation unit only
 142      and its address is never taken.  */
 143   unsigned local : 1;
 144
 145   /* Set once it has been finalized so we consider it to be output.  */
 146   unsigned finalized : 1;
 147
 148   /* False when there is something makes versioning impossible.  */
 149   unsigned versionable : 1;
 150
 151   /* False when function calling convention and signature can not be changed.
 152      This is the case when __builtin_apply_args is used.  */
 153   unsigned can_change_signature : 1;
 154
 155   /* True when the function has been originally extern inline, but it is
 156      redefined now.  */
 157   unsigned redefined_extern_inline : 1;
 158
 159   /* True if the function may enter serial irrevocable mode.  */
 160   unsigned tm_may_enter_irr : 1;
 161 };
 162
 163 /* Information about the function that needs to be computed globally
 164    once compilation is finished.  Available only with -funit-at-a-time.  */
 165
 166 struct GTY(()) cgraph_global_info {
 167   /* For inline clones this points to the function they will be
 168      inlined into.  */
 169   struct cgraph_node *inlined_to;
 170 };
 171
 172 /* Information about the function that is propagated by the RTL backend.
 173    Available only for functions that has been already assembled.  */
 174
 175 struct GTY(()) cgraph_rtl_info {
 176    unsigned int preferred_incoming_stack_boundary;
 177 };
 178
 179 /* Represent which DECL tree (or reference to such tree)
 180    will be replaced by another tree while versioning.  */
 181 struct GTY(()) ipa_replace_map
 182 {
 183   /* The tree that will be replaced.  */
 184   tree old_tree;
 185   /* The new (replacing) tree.  */
 186   tree new_tree;
 187   /* Parameter number to replace, when old_tree is NULL.  */
 188   int parm_num;
 189   /* True when a substitution should be done, false otherwise.  */
 190   bool replace_p;
 191   /* True when we replace a reference to old_tree.  */
 192   bool ref_p;
 193 };
 194 typedef struct ipa_replace_map *ipa_replace_map_p;
 195
 196 struct GTY(()) cgraph_clone_info
 197 {
 198   vec<ipa_replace_map_p, va_gc> *tree_map;
 199   bitmap args_to_skip;
 200   bitmap combined_args_to_skip;
 201 };
 202
 203
 204 /* The cgraph data structure.
 205    Each function decl has assigned cgraph_node listing callees and callers.  */
 206
 207 struct GTY(()) cgraph_node {
 208   struct symtab_node_base symbol;
 209   struct cgraph_edge *callees;
 210   struct cgraph_edge *callers;
 211   /* List of edges representing indirect calls with a yet undetermined
 212      callee.  */
 213   struct cgraph_edge *indirect_calls;
 214   /* For nested functions points to function the node is nested in.  */
 215   struct cgraph_node *
 216     GTY ((nested_ptr (union symtab_node_def, "(struct cgraph_node *)(%h)", "(symtab_node)%h")))
 217     origin;
 218   /* Points to first nested function, if any.  */
 219   struct cgraph_node *
 220     GTY ((nested_ptr (union symtab_node_def, "(struct cgraph_node *)(%h)", "(symtab_node)%h")))
 221     nested;
 222   /* Pointer to the next function with same origin, if any.  */
 223   struct cgraph_node *
 224     GTY ((nested_ptr (union symtab_node_def, "(struct cgraph_node *)(%h)", "(symtab_node)%h")))
 225     next_nested;
 226   /* Pointer to the next clone.  */
 227   struct cgraph_node *next_sibling_clone;
 228   struct cgraph_node *prev_sibling_clone;
 229   struct cgraph_node *clones;
 230   struct cgraph_node *clone_of;
 231   /* For functions with many calls sites it holds map from call expression
 232      to the edge to speed up cgraph_edge function.  */
 233   htab_t GTY((param_is (struct cgraph_edge))) call_site_hash;
 234   /* Declaration node used to be clone of. */
 235   tree former_clone_of;
 236
 237   /* Interprocedural passes scheduled to have their transform functions
 238      applied next time we execute local pass on them.  We maintain it
 239      per-function in order to allow IPA passes to introduce new functions.  */
 240   vec<ipa_opt_pass> GTY((skip)) ipa_transforms_to_apply;
 241
 242   struct cgraph_local_info local;
 243   struct cgraph_global_info global;
 244   struct cgraph_rtl_info rtl;
 245   struct cgraph_clone_info clone;
 246   struct cgraph_thunk_info thunk;
 247
 248   /* Expected number of executions: calculated in profile.c.  */
 249   gcov_type count;
 250   /* How to scale counts at materialization time; used to merge
 251      LTO units with different number of profile runs.  */
 252   int count_materialization_scale;
 253   /* Unique id of the node.  */
 254   int uid;
 255
 256   /* Set when decl is an abstract function pointed to by the
 257      ABSTRACT_DECL_ORIGIN of a reachable function.  */
 258   unsigned abstract_and_needed : 1;
 259   /* Set once the function is lowered (i.e. its CFG is built).  */
 260   unsigned lowered : 1;
 261   /* Set once the function has been instantiated and its callee
 262      lists created.  */
 263   unsigned analyzed : 1;
 264   /* Set when function is scheduled to be processed by local passes.  */
 265   unsigned process : 1;
 266   /* Set for aliases once they got through assemble_alias.  */
 267   unsigned alias : 1;
 268   /* Set for aliases created as C++ same body aliases.  */
 269   unsigned same_body_alias : 1;
 270   /* How commonly executed the node is.  Initialized during branch
 271      probabilities pass.  */
 272   ENUM_BITFIELD (node_frequency) frequency : 2;
 273   /* True when function can only be called at startup (from static ctor).  */
 274   unsigned only_called_at_startup : 1;
 275   /* True when function can only be called at startup (from static dtor).  */
 276   unsigned only_called_at_exit : 1;
 277   /* True when function is the transactional clone of a function which
 278      is called only from inside transactions.  */
 279   /* ?? We should be able to remove this.  We have enough bits in
 280      cgraph to calculate it.  */
 281   unsigned tm_clone : 1;
 282   /* True if this decl is a dispatcher for function versions.  */
 283   unsigned dispatcher_function : 1;
 284 };
 285
 286
 287 typedef struct cgraph_node *cgraph_node_ptr;
 288
 289
 290 /* Function Multiversioning info.  */
 291 struct GTY(()) cgraph_function_version_info {
 292   /* The cgraph_node for which the function version info is stored.  */
 293   struct cgraph_node *this_node;
 294   /* Chains all the semantically identical function versions.  The
 295      first function in this chain is the version_info node of the
 296      default function.  */
 297   struct cgraph_function_version_info *prev;
 298   /* If this version node corresponds to a dispatcher for function
 299      versions, this points to the version info node of the default
 300      function, the first node in the chain.  */
 301   struct cgraph_function_version_info *next;
 302   /* If this node corresponds to a function version, this points
 303      to the dispatcher function decl, which is the function that must
 304      be called to execute the right function version at run-time.
 305
 306      If this cgraph node is a dispatcher (if dispatcher_function is
 307      true, in the cgraph_node struct) for function versions, this
 308      points to resolver function, which holds the function body of the
 309      dispatcher. The dispatcher decl is an alias to the resolver
 310      function decl.  */
 311   tree dispatcher_resolver;
 312 };
 313
 314 /* Get the cgraph_function_version_info node corresponding to node.  */
 315 struct cgraph_function_version_info *
 316   get_cgraph_node_version (struct cgraph_node *node);
 317
 318 /* Insert a new cgraph_function_version_info node into cgraph_fnver_htab
 319    corresponding to cgraph_node NODE.  */
 320 struct cgraph_function_version_info *
 321   insert_new_cgraph_node_version (struct cgraph_node *node);
 322
 323 /* Record that DECL1 and DECL2 are semantically identical function
 324    versions.  */
 325 void record_function_versions (tree decl1, tree decl2);
 326
 327 /* Remove the cgraph_function_version_info and cgraph_node for DECL.  This
 328    DECL is a duplicate declaration.  */
 329 void delete_function_version (tree decl);
 330
 331 /* A cgraph node set is a collection of cgraph nodes.  A cgraph node
 332    can appear in multiple sets.  */
 333 struct cgraph_node_set_def
 334 {
 335   struct pointer_map_t *map;
 336   vec<cgraph_node_ptr> nodes;
 337 };
 338
 339 typedef struct varpool_node *varpool_node_ptr;
 340
 341
 342 /* A varpool node set is a collection of varpool nodes.  A varpool node
 343    can appear in multiple sets.  */
 344 struct varpool_node_set_def
 345 {
 346   struct pointer_map_t * map;
 347   vec<varpool_node_ptr> nodes;
 348 };
 349
 350 typedef struct cgraph_node_set_def *cgraph_node_set;
 351
 352
 353 typedef struct varpool_node_set_def *varpool_node_set;
 354
 355
 356 /* Iterator structure for cgraph node sets.  */
 357 typedef struct
 358 {
 359   cgraph_node_set set;
 360   unsigned index;
 361 } cgraph_node_set_iterator;
 362
 363 /* Iterator structure for varpool node sets.  */
 364 typedef struct
 365 {
 366   varpool_node_set set;
 367   unsigned index;
 368 } varpool_node_set_iterator;
 369
 370 #define DEFCIFCODE(code, string)        CIF_ ## code,
 371 /* Reasons for inlining failures.  */
 372 typedef enum cgraph_inline_failed_enum {
 373 #include "cif-code.def"
 374   CIF_N_REASONS
 375 } cgraph_inline_failed_t;
 376
 377 /* Structure containing additional information about an indirect call.  */
 378
 379 struct GTY(()) cgraph_indirect_call_info
 380 {
 381   /* When polymorphic is set, this field contains offset where the object which
 382      was actually used in the polymorphic resides within a larger structure.
 383      If agg_contents is set, the field contains the offset within the aggregate
 384      from which the address to call was loaded.  */
 385   HOST_WIDE_INT offset;
 386   /* OBJ_TYPE_REF_TOKEN of a polymorphic call (if polymorphic is set).  */
 387   HOST_WIDE_INT otr_token;
 388   /* Type of the object from OBJ_TYPE_REF_OBJECT. */
 389   tree otr_type;
 390   /* Index of the parameter that is called.  */
 391   int param_index;
 392   /* ECF flags determined from the caller.  */
 393   int ecf_flags;
 394
 395   /* Set when the call is a virtual call with the parameter being the
 396      associated object pointer rather than a simple direct call.  */
 397   unsigned polymorphic : 1;
 398   /* Set when the call is a call of a pointer loaded from contents of an
 399      aggregate at offset.  */
 400   unsigned agg_contents : 1;
 401   /* When the previous bit is set, this one determines whether the destination
 402      is loaded from a parameter passed by reference. */
 403   unsigned by_ref : 1;
 404 };
 405
 406 struct GTY((chain_next ("%h.next_caller"), chain_prev ("%h.prev_caller"))) cgraph_edge {
 407   /* Expected number of executions: calculated in profile.c.  */
 408   gcov_type count;
 409   struct cgraph_node *caller;
 410   struct cgraph_node *callee;
 411   struct cgraph_edge *prev_caller;
 412   struct cgraph_edge *next_caller;
 413   struct cgraph_edge *prev_callee;
 414   struct cgraph_edge *next_callee;
 415   gimple call_stmt;
 416   /* Additional information about an indirect call.  Not cleared when an edge
 417      becomes direct.  */
 418   struct cgraph_indirect_call_info *indirect_info;
 419   PTR GTY ((skip (""))) aux;
 420   /* When equal to CIF_OK, inline this call.  Otherwise, points to the
 421      explanation why function was not inlined.  */
 422   cgraph_inline_failed_t inline_failed;
 423   /* The stmt_uid of call_stmt.  This is used by LTO to recover the call_stmt
 424      when the function is serialized in.  */
 425   unsigned int lto_stmt_uid;
 426   /* Expected frequency of executions within the function.
 427      When set to CGRAPH_FREQ_BASE, the edge is expected to be called once
 428      per function call.  The range is 0 to CGRAPH_FREQ_MAX.  */
 429   int frequency;
 430   /* Unique id of the edge.  */
 431   int uid;
 432   /* Whether this edge was made direct by indirect inlining.  */
 433   unsigned int indirect_inlining_edge : 1;
 434   /* Whether this edge describes an indirect call with an undetermined
 435      callee.  */
 436   unsigned int indirect_unknown_callee : 1;
 437   /* Whether this edge is still a dangling  */
 438   /* True if the corresponding CALL stmt cannot be inlined.  */
 439   unsigned int call_stmt_cannot_inline_p : 1;
 440   /* Can this call throw externally?  */
 441   unsigned int can_throw_external : 1;
 442 };
 443
 444 #define CGRAPH_FREQ_BASE 1000
 445 #define CGRAPH_FREQ_MAX 100000
 446
 447 typedef struct cgraph_edge *cgraph_edge_p;
 448
 449
 450 /* The varpool data structure.
 451    Each static variable decl has assigned varpool_node.  */
 452
 453 struct GTY(()) varpool_node {
 454   struct symtab_node_base symbol;
 455   /* For aliases points to declaration DECL is alias of.  */
 456   tree alias_of;
 457
 458   /* Set once the variable has been instantiated and its callee
 459      lists created.  */
 460   unsigned analyzed : 1;
 461   /* Set once it has been finalized so we consider it to be output.  */
 462   unsigned finalized : 1;
 463   /* Set when variable is scheduled to be assembled.  */
 464   unsigned output : 1;
 465   /* Set for aliases once they got through assemble_alias.  Also set for
 466      extra name aliases in varpool_extra_name_alias.  */
 467   unsigned alias : 1;
 468   unsigned extra_name_alias : 1;
 469 };
 470
 471 /* Every top level asm statement is put into a asm_node.  */
 472
 473 struct GTY(()) asm_node {
 474   /* Next asm node.  */
 475   struct asm_node *next;
 476   /* String for this asm node.  */
 477   tree asm_str;
 478   /* Ordering of all cgraph nodes.  */
 479   int order;
 480 };
 481
 482 /* Symbol table entry.  */
 483 union GTY((desc ("%h.symbol.type"), chain_next ("%h.symbol.next"),
 484            chain_prev ("%h.symbol.previous"))) symtab_node_def {
 485   struct symtab_node_base GTY ((tag ("SYMTAB_SYMBOL"))) symbol;
 486   /* To access the following fields,
 487      use the use dyn_cast or as_a to obtain the concrete type.  */
 488   struct cgraph_node GTY ((tag ("SYMTAB_FUNCTION"))) x_function;
 489   struct varpool_node GTY ((tag ("SYMTAB_VARIABLE"))) x_variable;
 490 };
 491
 492 /* Report whether or not THIS symtab node is a function, aka cgraph_node.  */
 493
 494 template <>
 495 template <>
 496 inline bool
 497 is_a_helper <cgraph_node>::test (symtab_node_def *p)
 498 {
 499   return p->symbol.type == SYMTAB_FUNCTION;
 500 }
 501
 502 /* Report whether or not THIS symtab node is a vriable, aka varpool_node.  */
 503
 504 template <>
 505 template <>
 506 inline bool
 507 is_a_helper <varpool_node>::test (symtab_node_def *p)
 508 {
 509   return p->symbol.type == SYMTAB_VARIABLE;
 510 }
 511
 512 extern GTY(()) symtab_node symtab_nodes;
 513 extern GTY(()) int cgraph_n_nodes;
 514 extern GTY(()) int cgraph_max_uid;
 515 extern GTY(()) int cgraph_edge_max_uid;
 516 extern bool cgraph_global_info_ready;
 517 enum cgraph_state
 518 {
 519   /* Frontend is parsing and finalizing functions.  */
 520   CGRAPH_STATE_PARSING,
 521   /* Callgraph is being constructed.  It is safe to add new functions.  */
 522   CGRAPH_STATE_CONSTRUCTION,
 523   /* Callgraph is built and IPA passes are being run.  */
 524   CGRAPH_STATE_IPA,
 525   /* Callgraph is built and all functions are transformed to SSA form.  */
 526   CGRAPH_STATE_IPA_SSA,
 527   /* Functions are now ordered and being passed to RTL expanders.  */
 528   CGRAPH_STATE_EXPANSION,
 529   /* All cgraph expansion is done.  */
 530   CGRAPH_STATE_FINISHED
 531 };
 532 extern enum cgraph_state cgraph_state;
 533 extern bool cgraph_function_flags_ready;
 534 extern cgraph_node_set cgraph_new_nodes;
 535
 536 extern GTY(()) struct asm_node *asm_nodes;
 537 extern GTY(()) int symtab_order;
 538 extern bool same_body_aliases_done;
 539
 540 /* In symtab.c  */
 541 void symtab_register_node (symtab_node);
 542 void symtab_unregister_node (symtab_node);
 543 void symtab_remove_node (symtab_node);
 544 symtab_node symtab_get_node (const_tree);
 545 symtab_node symtab_node_for_asm (const_tree asmname);
 546 const char * symtab_node_asm_name (symtab_node);
 547 const char * symtab_node_name (symtab_node);
 548 void symtab_insert_node_to_hashtable (symtab_node);
 549 void symtab_add_to_same_comdat_group (symtab_node, symtab_node);
 550 void symtab_dissolve_same_comdat_group_list (symtab_node node);
 551 void dump_symtab (FILE *);
 552 void debug_symtab (void);
 553 void dump_symtab_node (FILE *, symtab_node);
 554 void debug_symtab_node (symtab_node);
 555 void dump_symtab_base (FILE *, symtab_node);
 556 void verify_symtab (void);
 557 void verify_symtab_node (symtab_node);
 558 bool verify_symtab_base (symtab_node);
 559 bool symtab_used_from_object_file_p (symtab_node);
 560 void symtab_make_decl_local (tree);
 561
 562 /* In cgraph.c  */
 563 void dump_cgraph (FILE *);
 564 void debug_cgraph (void);
 565 void dump_cgraph_node (FILE *, struct cgraph_node *);
 566 void debug_cgraph_node (struct cgraph_node *);
 567 void cgraph_remove_edge (struct cgraph_edge *);
 568 void cgraph_remove_node (struct cgraph_node *);
 569 void cgraph_release_function_body (struct cgraph_node *);
 570 void cgraph_node_remove_callees (struct cgraph_node *node);
 571 struct cgraph_edge *cgraph_create_edge (struct cgraph_node *,
 572                                         struct cgraph_node *,
 573                                         gimple, gcov_type, int);
 574 struct cgraph_edge *cgraph_create_indirect_edge (struct cgraph_node *, gimple,
 575                                                  int, gcov_type, int);
 576 struct cgraph_indirect_call_info *cgraph_allocate_init_indirect_info (void);
 577 struct cgraph_node * cgraph_create_node (tree);
 578 struct cgraph_node * cgraph_create_empty_node (void);
 579 struct cgraph_node * cgraph_get_create_node (tree);
 580 struct cgraph_node * cgraph_get_create_real_symbol_node (tree);
 581 struct cgraph_node * cgraph_same_body_alias (struct cgraph_node *, tree, tree);
 582 struct cgraph_node * cgraph_add_thunk (struct cgraph_node *, tree, tree, bool, HOST_WIDE_INT,
 583                                        HOST_WIDE_INT, tree, tree);
 584 struct cgraph_node *cgraph_node_for_asm (tree);
 585 struct cgraph_edge *cgraph_edge (struct cgraph_node *, gimple);
 586 void cgraph_set_call_stmt (struct cgraph_edge *, gimple);
 587 void cgraph_update_edges_for_call_stmt (gimple, tree, gimple);
 588 struct cgraph_local_info *cgraph_local_info (tree);
 589 struct cgraph_global_info *cgraph_global_info (tree);
 590 struct cgraph_rtl_info *cgraph_rtl_info (tree);
 591 struct cgraph_node *cgraph_create_function_alias (tree, tree);
 592 void cgraph_call_node_duplication_hooks (struct cgraph_node *,
 593                                          struct cgraph_node *);
 594 void cgraph_call_edge_duplication_hooks (struct cgraph_edge *,
 595                                          struct cgraph_edge *);
 596
 597 void cgraph_redirect_edge_callee (struct cgraph_edge *, struct cgraph_node *);
 598 void cgraph_make_edge_direct (struct cgraph_edge *, struct cgraph_node *);
 599 bool cgraph_only_called_directly_p (struct cgraph_node *);
 600
 601 bool cgraph_function_possibly_inlined_p (tree);
 602 void cgraph_unnest_node (struct cgraph_node *);
 603
 604 enum availability cgraph_function_body_availability (struct cgraph_node *);
 605 void cgraph_add_new_function (tree, bool);
 606 const char* cgraph_inline_failed_string (cgraph_inline_failed_t);
 607
 608 void cgraph_set_nothrow_flag (struct cgraph_node *, bool);
 609 void cgraph_set_const_flag (struct cgraph_node *, bool, bool);
 610 void cgraph_set_pure_flag (struct cgraph_node *, bool, bool);
 611 bool cgraph_node_cannot_return (struct cgraph_node *);
 612 bool cgraph_edge_cannot_lead_to_return (struct cgraph_edge *);
 613 bool cgraph_will_be_removed_from_program_if_no_direct_calls
 614   (struct cgraph_node *node);
 615 bool cgraph_can_remove_if_no_direct_calls_and_refs_p
 616   (struct cgraph_node *node);
 617 bool cgraph_can_remove_if_no_direct_calls_p (struct cgraph_node *node);
 618 bool resolution_used_from_other_file_p (enum ld_plugin_symbol_resolution);
 619 bool cgraph_for_node_thunks_and_aliases (struct cgraph_node *,
 620                                          bool (*) (struct cgraph_node *, void *),
 621                                          void *,
 622                                          bool);
 623 bool cgraph_for_node_and_aliases (struct cgraph_node *,
 624                                   bool (*) (struct cgraph_node *, void *),
 625                                   void *, bool);
 626 vec<cgraph_edge_p>  collect_callers_of_node (struct cgraph_node *node);
 627 void verify_cgraph (void);
 628 void verify_cgraph_node (struct cgraph_node *);
 629 void cgraph_mark_address_taken_node (struct cgraph_node *);
 630
 631 typedef void (*cgraph_edge_hook)(struct cgraph_edge *, void *);
 632 typedef void (*cgraph_node_hook)(struct cgraph_node *, void *);
 633 typedef void (*cgraph_2edge_hook)(struct cgraph_edge *, struct cgraph_edge *,
 634                                   void *);
 635 typedef void (*cgraph_2node_hook)(struct cgraph_node *, struct cgraph_node *,
 636                                   void *);
 637 struct cgraph_edge_hook_list;
 638 struct cgraph_node_hook_list;
 639 struct cgraph_2edge_hook_list;
 640 struct cgraph_2node_hook_list;
 641 struct cgraph_edge_hook_list *cgraph_add_edge_removal_hook (cgraph_edge_hook, void *);
 642 void cgraph_remove_edge_removal_hook (struct cgraph_edge_hook_list *);
 643 struct cgraph_node_hook_list *cgraph_add_node_removal_hook (cgraph_node_hook,
 644                                                             void *);
 645 void cgraph_remove_node_removal_hook (struct cgraph_node_hook_list *);
 646 struct cgraph_node_hook_list *cgraph_add_function_insertion_hook (cgraph_node_hook,
 647                                                                   void *);
 648 void cgraph_remove_function_insertion_hook (struct cgraph_node_hook_list *);
 649 void cgraph_call_function_insertion_hooks (struct cgraph_node *node);
 650 struct cgraph_2edge_hook_list *cgraph_add_edge_duplication_hook (cgraph_2edge_hook, void *);
 651 void cgraph_remove_edge_duplication_hook (struct cgraph_2edge_hook_list *);
 652 struct cgraph_2node_hook_list *cgraph_add_node_duplication_hook (cgraph_2node_hook, void *);
 653 void cgraph_remove_node_duplication_hook (struct cgraph_2node_hook_list *);
 654 gimple cgraph_redirect_edge_call_stmt_to_callee (struct cgraph_edge *);
 655 bool cgraph_propagate_frequency (struct cgraph_node *node);
 656
 657 /* In cgraphunit.c  */
 658 struct asm_node *add_asm_node (tree);
 659 extern FILE *cgraph_dump_file;
 660 void cgraph_finalize_function (tree, bool);
 661 void finalize_compilation_unit (void);
 662 void compile (void);
 663 void init_cgraph (void);
 664 bool cgraph_process_new_functions (void);
 665 void cgraph_process_same_body_aliases (void);
 666 void fixup_same_cpp_alias_visibility (symtab_node node, symtab_node target, tree alias);
 667 /*  Initialize datastructures so DECL is a function in lowered gimple form.
 668     IN_SSA is true if the gimple is in SSA.  */
 669 basic_block init_lowered_empty_function (tree decl, bool in_ssa);
 670
 671 /* In cgraphclones.c  */
 672
 673 struct cgraph_edge * cgraph_clone_edge (struct cgraph_edge *,
 674                                         struct cgraph_node *, gimple,
 675                                         unsigned, gcov_type, int, bool);
 676 struct cgraph_node * cgraph_clone_node (struct cgraph_node *, tree, gcov_type,
 677                                         int, bool, vec<cgraph_edge_p>,
 678                                         bool);
 679 tree clone_function_name (tree decl, const char *);
 680 struct cgraph_node * cgraph_create_virtual_clone (struct cgraph_node *old_node,
 681                                                   vec<cgraph_edge_p>,
 682                                                   vec<ipa_replace_map_p, va_gc> *tree_map,
 683                                                   bitmap args_to_skip,
 684                                                   const char *clone_name);
 685 struct cgraph_node *cgraph_find_replacement_node (struct cgraph_node *);
 686 bool cgraph_remove_node_and_inline_clones (struct cgraph_node *, struct cgraph_node *);
 687 void cgraph_set_call_stmt_including_clones (struct cgraph_node *, gimple, gimple);
 688 void cgraph_create_edge_including_clones (struct cgraph_node *,
 689                                           struct cgraph_node *,
 690                                           gimple, gimple, gcov_type, int,
 691                                           cgraph_inline_failed_t);
 692 void cgraph_materialize_all_clones (void);
 693 struct cgraph_node * cgraph_copy_node_for_versioning (struct cgraph_node *,
 694                 tree, vec<cgraph_edge_p>, bitmap);
 695 struct cgraph_node *cgraph_function_versioning (struct cgraph_node *,
 696                                                 vec<cgraph_edge_p>,
 697                                                 vec<ipa_replace_map_p, va_gc> *,
 698                                                 bitmap, bool, bitmap,
 699                                                 basic_block, const char *);
 700 void tree_function_versioning (tree, tree, vec<ipa_replace_map_p, va_gc> *,
 701                                bool, bitmap, bool, bitmap, basic_block);
 702
 703 /* In cgraphbuild.c  */
 704 unsigned int rebuild_cgraph_edges (void);
 705 void cgraph_rebuild_references (void);
 706 int compute_call_stmt_bb_frequency (tree, basic_block bb);
 707 void record_references_in_initializer (tree, bool);
 708
 709 /* In ipa.c  */
 710 bool symtab_remove_unreachable_nodes (bool, FILE *);
 711 cgraph_node_set cgraph_node_set_new (void);
 712 cgraph_node_set_iterator cgraph_node_set_find (cgraph_node_set,
 713                                                struct cgraph_node *);
 714 void cgraph_node_set_add (cgraph_node_set, struct cgraph_node *);
 715 void cgraph_node_set_remove (cgraph_node_set, struct cgraph_node *);
 716 void dump_cgraph_node_set (FILE *, cgraph_node_set);
 717 void debug_cgraph_node_set (cgraph_node_set);
 718 void free_cgraph_node_set (cgraph_node_set);
 719 void cgraph_build_static_cdtor (char which, tree body, int priority);
 720
 721 varpool_node_set varpool_node_set_new (void);
 722 varpool_node_set_iterator varpool_node_set_find (varpool_node_set,
 723                                                struct varpool_node *);
 724 void varpool_node_set_add (varpool_node_set, struct varpool_node *);
 725 void varpool_node_set_remove (varpool_node_set, struct varpool_node *);
 726 void dump_varpool_node_set (FILE *, varpool_node_set);
 727 void debug_varpool_node_set (varpool_node_set);
 728 void free_varpool_node_set (varpool_node_set);
 729 void ipa_discover_readonly_nonaddressable_vars (void);
 730 bool cgraph_comdat_can_be_unshared_p (struct cgraph_node *);
 731 bool varpool_externally_visible_p (struct varpool_node *);
 732
 733 /* In predict.c  */
 734 bool cgraph_maybe_hot_edge_p (struct cgraph_edge *e);
 735 bool cgraph_optimize_for_size_p (struct cgraph_node *);
 736
 737 /* In varpool.c  */
 738 struct varpool_node *varpool_node_for_decl (tree);
 739 struct varpool_node *varpool_node_for_asm (tree asmname);
 740 void varpool_mark_needed_node (struct varpool_node *);
 741 void debug_varpool (void);
 742 void dump_varpool (FILE *);
 743 void dump_varpool_node (FILE *, struct varpool_node *);
 744
 745 void varpool_finalize_decl (tree);
 746 bool decide_is_variable_needed (struct varpool_node *, tree);
 747 enum availability cgraph_variable_initializer_availability (struct varpool_node *);
 748 void cgraph_make_node_local (struct cgraph_node *);
 749 bool cgraph_node_can_be_local_p (struct cgraph_node *);
 750
 751
 752 void varpool_remove_node (struct varpool_node *node);
 753 void varpool_finalize_named_section_flags (struct varpool_node *node);
 754 bool varpool_output_variables (void);
 755 bool varpool_assemble_decl (struct varpool_node *node);
 756 void varpool_analyze_node (struct varpool_node *);
 757 struct varpool_node * varpool_extra_name_alias (tree, tree);
 758 struct varpool_node * varpool_create_variable_alias (tree, tree);
 759 void varpool_reset_queue (void);
 760 bool const_value_known_p (tree);
 761 bool varpool_for_node_and_aliases (struct varpool_node *,
 762                                    bool (*) (struct varpool_node *, void *),
 763                                    void *, bool);
 764 void varpool_add_new_variable (tree);
 765 void symtab_initialize_asm_name_hash (void);
 766 void symtab_prevail_in_asm_name_hash (symtab_node node);
 767
 768
 769 /* Return callgraph node for given symbol and check it is a function. */
 770 static inline struct cgraph_node *
 771 cgraph (symtab_node node)
 772 {
 773   gcc_checking_assert (!node || node->symbol.type == SYMTAB_FUNCTION);
 774   return (struct cgraph_node *)node;
 775 }
 776
 777 /* Return varpool node for given symbol and check it is a variable.  */
 778 static inline struct varpool_node *
 779 varpool (symtab_node node)
 780 {
 781   gcc_checking_assert (!node || node->symbol.type == SYMTAB_VARIABLE);
 782   return (struct varpool_node *)node;
 783 }
 784
 785 /* Return callgraph node for given symbol and check it is a function. */
 786 static inline struct cgraph_node *
 787 cgraph_get_node (const_tree decl)
 788 {
 789   gcc_checking_assert (TREE_CODE (decl) == FUNCTION_DECL);
 790   return cgraph (symtab_get_node (decl));
 791 }
 792
 793 /* Return varpool node for given symbol and check it is a function. */
 794 static inline struct varpool_node *
 795 varpool_get_node (const_tree decl)
 796 {
 797   gcc_checking_assert (TREE_CODE (decl) == VAR_DECL);
 798   return varpool (symtab_get_node (decl));
 799 }
 800
 801 /* Return asm name of cgraph node.  */
 802 static inline const char *
 803 cgraph_node_asm_name(struct cgraph_node *node)
 804 {
 805   return symtab_node_asm_name ((symtab_node)node);
 806 }
 807
 808 /* Return asm name of varpool node.  */
 809 static inline const char *
 810 varpool_node_asm_name(struct varpool_node *node)
 811 {
 812   return symtab_node_asm_name ((symtab_node)node);
 813 }
 814
 815 /* Return name of cgraph node.  */
 816 static inline const char *
 817 cgraph_node_name(struct cgraph_node *node)
 818 {
 819   return symtab_node_name ((symtab_node)node);
 820 }
 821
 822 /* Return name of varpool node.  */
 823 static inline const char *
 824 varpool_node_name(struct varpool_node *node)
 825 {
 826   return symtab_node_name ((symtab_node)node);
 827 }
 828
 829 /* Walk all symbols.  */
 830 #define FOR_EACH_SYMBOL(node) \
 831    for ((node) = symtab_nodes; (node); (node) = (node)->symbol.next)
 832
 833
 834 /* Return first variable.  */
 835 static inline struct varpool_node *
 836 varpool_first_variable (void)
 837 {
 838   symtab_node node;
 839   for (node = symtab_nodes; node; node = node->symbol.next)
 840     if (varpool_node *vnode = dyn_cast <varpool_node> (node))
 841       return vnode;
 842   return NULL;
 843 }
 844
 845 /* Return next variable after NODE.  */
 846 static inline struct varpool_node *
 847 varpool_next_variable (struct varpool_node *node)
 848 {
 849   symtab_node node1 = (symtab_node) node->symbol.next;
 850   for (; node1; node1 = node1->symbol.next)
 851     if (varpool_node *vnode1 = dyn_cast <varpool_node> (node1))
 852       return vnode1;
 853   return NULL;
 854 }
 855 /* Walk all variables.  */
 856 #define FOR_EACH_VARIABLE(node) \
 857    for ((node) = varpool_first_variable (); \
 858         (node); \
 859         (node) = varpool_next_variable ((node)))
 860
 861 /* Return first reachable static variable with initializer.  */
 862 static inline struct varpool_node *
 863 varpool_first_static_initializer (void)
 864 {
 865   symtab_node node;
 866   for (node = symtab_nodes; node; node = node->symbol.next)
 867     {
 868       varpool_node *vnode = dyn_cast <varpool_node> (node);
 869       if (vnode && DECL_INITIAL (node->symbol.decl))
 870         return vnode;
 871     }
 872   return NULL;
 873 }
 874
 875 /* Return next reachable static variable with initializer after NODE.  */
 876 static inline struct varpool_node *
 877 varpool_next_static_initializer (struct varpool_node *node)
 878 {
 879   symtab_node node1 = (symtab_node) node->symbol.next;
 880   for (; node1; node1 = node1->symbol.next)
 881     {
 882       varpool_node *vnode1 = dyn_cast <varpool_node> (node1);
 883       if (vnode1 && DECL_INITIAL (node1->symbol.decl))
 884         return vnode1;
 885     }
 886   return NULL;
 887 }
 888
 889 /* Walk all static variables with initializer set.  */
 890 #define FOR_EACH_STATIC_INITIALIZER(node) \
 891    for ((node) = varpool_first_static_initializer (); (node); \
 892         (node) = varpool_next_static_initializer (node))
 893
 894 /* Return first reachable static variable with initializer.  */
 895 static inline struct varpool_node *
 896 varpool_first_defined_variable (void)
 897 {
 898   symtab_node node;
 899   for (node = symtab_nodes; node; node = node->symbol.next)
 900     {
 901       varpool_node *vnode = dyn_cast <varpool_node> (node);
 902       if (vnode && vnode->analyzed)
 903         return vnode;
 904     }
 905   return NULL;
 906 }
 907
 908 /* Return next reachable static variable with initializer after NODE.  */
 909 static inline struct varpool_node *
 910 varpool_next_defined_variable (struct varpool_node *node)
 911 {
 912   symtab_node node1 = (symtab_node) node->symbol.next;
 913   for (; node1; node1 = node1->symbol.next)
 914     {
 915       varpool_node *vnode1 = dyn_cast <varpool_node> (node1);
 916       if (vnode1 && vnode1->analyzed)
 917         return vnode1;
 918     }
 919   return NULL;
 920 }
 921 /* Walk all variables with definitions in current unit.  */
 922 #define FOR_EACH_DEFINED_VARIABLE(node) \
 923    for ((node) = varpool_first_defined_variable (); (node); \
 924         (node) = varpool_next_defined_variable (node))
 925
 926 /* Return first function with body defined.  */
 927 static inline struct cgraph_node *
 928 cgraph_first_defined_function (void)
 929 {
 930   symtab_node node;
 931   for (node = symtab_nodes; node; node = node->symbol.next)
 932     {
 933       cgraph_node *cn = dyn_cast <cgraph_node> (node);
 934       if (cn && cn->analyzed)
 935         return cn;
 936     }
 937   return NULL;
 938 }
 939
 940 /* Return next function with body defined after NODE.  */
 941 static inline struct cgraph_node *
 942 cgraph_next_defined_function (struct cgraph_node *node)
 943 {
 944   symtab_node node1 = (symtab_node) node->symbol.next;
 945   for (; node1; node1 = node1->symbol.next)
 946     {
 947       cgraph_node *cn1 = dyn_cast <cgraph_node> (node1);
 948       if (cn1 && cn1->analyzed)
 949         return cn1;
 950     }
 951   return NULL;
 952 }
 953
 954 /* Walk all functions with body defined.  */
 955 #define FOR_EACH_DEFINED_FUNCTION(node) \
 956    for ((node) = cgraph_first_defined_function (); (node); \
 957         (node) = cgraph_next_defined_function ((node)))
 958
 959 /* Return first function.  */
 960 static inline struct cgraph_node *
 961 cgraph_first_function (void)
 962 {
 963   symtab_node node;
 964   for (node = symtab_nodes; node; node = node->symbol.next)
 965     if (cgraph_node *cn = dyn_cast <cgraph_node> (node))
 966       return cn;
 967   return NULL;
 968 }
 969
 970 /* Return next function.  */
 971 static inline struct cgraph_node *
 972 cgraph_next_function (struct cgraph_node *node)
 973 {
 974   symtab_node node1 = (symtab_node) node->symbol.next;
 975   for (; node1; node1 = node1->symbol.next)
 976     if (cgraph_node *cn1 = dyn_cast <cgraph_node> (node1))
 977       return cn1;
 978   return NULL;
 979 }
 980 /* Walk all functions.  */
 981 #define FOR_EACH_FUNCTION(node) \
 982    for ((node) = cgraph_first_function (); (node); \
 983         (node) = cgraph_next_function ((node)))
 984
 985 /* Return true when NODE is a function with Gimple body defined
 986    in current unit.  Functions can also be define externally or they
 987    can be thunks with no Gimple representation.
 988
 989    Note that at WPA stage, the function body may not be present in memory.  */
 990
 991 static inline bool
 992 cgraph_function_with_gimple_body_p (struct cgraph_node *node)
 993 {
 994   return node->analyzed && !node->thunk.thunk_p && !node->alias;
 995 }
 996
 997 /* Return first function with body defined.  */
 998 static inline struct cgraph_node *
 999 cgraph_first_function_with_gimple_body (void)
1000 {
1001   symtab_node node;
1002   for (node = symtab_nodes; node; node = node->symbol.next)
1003     {
1004       cgraph_node *cn = dyn_cast <cgraph_node> (node);
1005       if (cn && cgraph_function_with_gimple_body_p (cn))
1006         return cn;
1007     }
1008   return NULL;
1009 }
1010
1011 /* Return next reachable static variable with initializer after NODE.  */
1012 static inline struct cgraph_node *
1013 cgraph_next_function_with_gimple_body (struct cgraph_node *node)
1014 {
1015   symtab_node node1 = node->symbol.next;
1016   for (; node1; node1 = node1->symbol.next)
1017     {
1018       cgraph_node *cn1 = dyn_cast <cgraph_node> (node1);
1019       if (cn1 && cgraph_function_with_gimple_body_p (cn1))
1020         return cn1;
1021     }
1022   return NULL;
1023 }
1024
1025 /* Walk all functions with body defined.  */
1026 #define FOR_EACH_FUNCTION_WITH_GIMPLE_BODY(node) \
1027    for ((node) = cgraph_first_function_with_gimple_body (); (node); \
1028         (node) = cgraph_next_function_with_gimple_body (node))
1029
1030 /* Create a new static variable of type TYPE.  */
1031 tree add_new_static_var (tree type);
1032
1033 /* Return true if iterator CSI points to nothing.  */
1034 static inline bool
1035 csi_end_p (cgraph_node_set_iterator csi)
1036 {
1037   return csi.index >= csi.set->nodes.length ();
1038 }
1039
1040 /* Advance iterator CSI.  */
1041 static inline void
1042 csi_next (cgraph_node_set_iterator *csi)
1043 {
1044   csi->index++;
1045 }
1046
1047 /* Return the node pointed to by CSI.  */
1048 static inline struct cgraph_node *
1049 csi_node (cgraph_node_set_iterator csi)
1050 {
1051   return csi.set->nodes[csi.index];
1052 }
1053
1054 /* Return an iterator to the first node in SET.  */
1055 static inline cgraph_node_set_iterator
1056 csi_start (cgraph_node_set set)
1057 {
1058   cgraph_node_set_iterator csi;
1059
1060   csi.set = set;
1061   csi.index = 0;
1062   return csi;
1063 }
1064
1065 /* Return true if SET contains NODE.  */
1066 static inline bool
1067 cgraph_node_in_set_p (struct cgraph_node *node, cgraph_node_set set)
1068 {
1069   cgraph_node_set_iterator csi;
1070   csi = cgraph_node_set_find (set, node);
1071   return !csi_end_p (csi);
1072 }
1073
1074 /* Return number of nodes in SET.  */
1075 static inline size_t
1076 cgraph_node_set_size (cgraph_node_set set)
1077 {
1078   return set->nodes.length ();
1079 }
1080
1081 /* Return true if iterator VSI points to nothing.  */
1082 static inline bool
1083 vsi_end_p (varpool_node_set_iterator vsi)
1084 {
1085   return vsi.index >= vsi.set->nodes.length ();
1086 }
1087
1088 /* Advance iterator VSI.  */
1089 static inline void
1090 vsi_next (varpool_node_set_iterator *vsi)
1091 {
1092   vsi->index++;
1093 }
1094
1095 /* Return the node pointed to by VSI.  */
1096 static inline struct varpool_node *
1097 vsi_node (varpool_node_set_iterator vsi)
1098 {
1099   return vsi.set->nodes[vsi.index];
1100 }
1101
1102 /* Return an iterator to the first node in SET.  */
1103 static inline varpool_node_set_iterator
1104 vsi_start (varpool_node_set set)
1105 {
1106   varpool_node_set_iterator vsi;
1107
1108   vsi.set = set;
1109   vsi.index = 0;
1110   return vsi;
1111 }
1112
1113 /* Return true if SET contains NODE.  */
1114 static inline bool
1115 varpool_node_in_set_p (struct varpool_node *node, varpool_node_set set)
1116 {
1117   varpool_node_set_iterator vsi;
1118   vsi = varpool_node_set_find (set, node);
1119   return !vsi_end_p (vsi);
1120 }
1121
1122 /* Return number of nodes in SET.  */
1123 static inline size_t
1124 varpool_node_set_size (varpool_node_set set)
1125 {
1126   return set->nodes.length ();
1127 }
1128
1129 /* Uniquize all constants that appear in memory.
1130    Each constant in memory thus far output is recorded
1131    in `const_desc_table'.  */
1132
1133 struct GTY(()) constant_descriptor_tree {
1134   /* A MEM for the constant.  */
1135   rtx rtl;
1136
1137   /* The value of the constant.  */
1138   tree value;
1139
1140   /* Hash of value.  Computing the hash from value each time
1141      hashfn is called can't work properly, as that means recursive
1142      use of the hash table during hash table expansion.  */
1143   hashval_t hash;
1144 };
1145
1146 /* Return true if set is nonempty.  */
1147 static inline bool
1148 cgraph_node_set_nonempty_p (cgraph_node_set set)
1149 {
1150   return !set->nodes.is_empty ();
1151 }
1152
1153 /* Return true if set is nonempty.  */
1154 static inline bool
1155 varpool_node_set_nonempty_p (varpool_node_set set)
1156 {
1157   return !set->nodes.is_empty ();
1158 }
1159
1160 /* Return true when function NODE is only called directly or it has alias.
1161    i.e. it is not externally visible, address was not taken and
1162    it is not used in any other non-standard way.  */
1163
1164 static inline bool
1165 cgraph_only_called_directly_or_aliased_p (struct cgraph_node *node)
1166 {
1167   gcc_assert (!node->global.inlined_to);
1168   return (!node->symbol.force_output && !node->symbol.address_taken
1169           && !node->symbol.used_from_other_partition
1170           && !DECL_VIRTUAL_P (node->symbol.decl)
1171           && !DECL_STATIC_CONSTRUCTOR (node->symbol.decl)
1172           && !DECL_STATIC_DESTRUCTOR (node->symbol.decl)
1173           && !node->symbol.externally_visible);
1174 }
1175
1176 /* Return true when function NODE can be removed from callgraph
1177    if all direct calls are eliminated.  */
1178
1179 static inline bool
1180 varpool_can_remove_if_no_refs (struct varpool_node *node)
1181 {
1182   if (DECL_EXTERNAL (node->symbol.decl))
1183     return true;
1184   return (!node->symbol.force_output && !node->symbol.used_from_other_partition
1185           && ((DECL_COMDAT (node->symbol.decl)
1186                && !symtab_used_from_object_file_p ((symtab_node) node))
1187               || !node->symbol.externally_visible
1188               || DECL_HAS_VALUE_EXPR_P (node->symbol.decl)));
1189 }
1190
1191 /* Return true when all references to VNODE must be visible in ipa_ref_list.
1192    i.e. if the variable is not externally visible or not used in some magic
1193    way (asm statement or such).
1194    The magic uses are all summarized in force_output flag.  */
1195
1196 static inline bool
1197 varpool_all_refs_explicit_p (struct varpool_node *vnode)
1198 {
1199   return (vnode->analyzed
1200           && !vnode->symbol.externally_visible
1201           && !vnode->symbol.used_from_other_partition
1202           && !vnode->symbol.force_output);
1203 }
1204
1205 /* Constant pool accessor function.  */
1206 htab_t constant_pool_htab (void);
1207
1208 /* FIXME: inappropriate dependency of cgraph on IPA.  */
1209 #include "ipa-ref-inline.h"
1210
1211 /* Return node that alias N is aliasing.  */
1212
1213 static inline struct cgraph_node *
1214 cgraph_alias_aliased_node (struct cgraph_node *n)
1215 {
1216   struct ipa_ref *ref;
1217
1218   ipa_ref_list_reference_iterate (&n->symbol.ref_list, 0, ref);
1219   gcc_checking_assert (ref->use == IPA_REF_ALIAS);
1220   if (is_a <cgraph_node> (ref->referred))
1221     return ipa_ref_node (ref);
1222   return NULL;
1223 }
1224
1225 /* Return node that alias N is aliasing.  */
1226
1227 static inline struct varpool_node *
1228 varpool_alias_aliased_node (struct varpool_node *n)
1229 {
1230   struct ipa_ref *ref;
1231
1232   ipa_ref_list_reference_iterate (&n->symbol.ref_list, 0, ref);
1233   gcc_checking_assert (ref->use == IPA_REF_ALIAS);
1234   if (is_a <varpool_node> (ref->referred))
1235     return ipa_ref_varpool_node (ref);
1236   return NULL;
1237 }
1238
1239 /* Given NODE, walk the alias chain to return the function NODE is alias of.
1240    Walk through thunk, too.
1241    When AVAILABILITY is non-NULL, get minimal availability in the chain.  */
1242
1243 static inline struct cgraph_node *
1244 cgraph_function_node (struct cgraph_node *node, enum availability *availability)
1245 {
1246   if (availability)
1247     *availability = cgraph_function_body_availability (node);
1248   while (node)
1249     {
1250       if (node->alias && node->analyzed)
1251         node = cgraph_alias_aliased_node (node);
1252       else if (node->thunk.thunk_p)
1253         node = node->callees->callee;
1254       else
1255         return node;
1256       if (node && availability)
1257         {
1258           enum availability a;
1259           a = cgraph_function_body_availability (node);
1260           if (a < *availability)
1261             *availability = a;
1262         }
1263     }
1264   if (availability)
1265     *availability = AVAIL_NOT_AVAILABLE;
1266   return NULL;
1267 }
1268
1269 /* Given NODE, walk the alias chain to return the function NODE is alias of.
1270    Do not walk through thunks.
1271    When AVAILABILITY is non-NULL, get minimal availability in the chain.  */
1272
1273 static inline struct cgraph_node *
1274 cgraph_function_or_thunk_node (struct cgraph_node *node, enum availability *availability)
1275 {
1276   if (availability)
1277     *availability = cgraph_function_body_availability (node);
1278   while (node)
1279     {
1280       if (node->alias && node->analyzed)
1281         node = cgraph_alias_aliased_node (node);
1282       else
1283         return node;
1284       if (node && availability)
1285         {
1286           enum availability a;
1287           a = cgraph_function_body_availability (node);
1288           if (a < *availability)
1289             *availability = a;
1290         }
1291     }
1292   if (availability)
1293     *availability = AVAIL_NOT_AVAILABLE;
1294   return NULL;
1295 }
1296
1297 /* Given NODE, walk the alias chain to return the function NODE is alias of.
1298    Do not walk through thunks.
1299    When AVAILABILITY is non-NULL, get minimal availability in the chain.  */
1300
1301 static inline struct varpool_node *
1302 varpool_variable_node (struct varpool_node *node, enum availability *availability)
1303 {
1304   if (availability)
1305     *availability = cgraph_variable_initializer_availability (node);
1306   while (node)
1307     {
1308       if (node->alias && node->analyzed)
1309         node = varpool_alias_aliased_node (node);
1310       else
1311         return node;
1312       if (node && availability)
1313         {
1314           enum availability a;
1315           a = cgraph_variable_initializer_availability (node);
1316           if (a < *availability)
1317             *availability = a;
1318         }
1319     }
1320   if (availability)
1321     *availability = AVAIL_NOT_AVAILABLE;
1322   return NULL;
1323 }
1324
1325 /* Return true when the edge E represents a direct recursion.  */
1326 static inline bool
1327 cgraph_edge_recursive_p (struct cgraph_edge *e)
1328 {
1329   struct cgraph_node *callee = cgraph_function_or_thunk_node (e->callee, NULL);
1330   if (e->caller->global.inlined_to)
1331     return e->caller->global.inlined_to->symbol.decl == callee->symbol.decl;
1332   else
1333     return e->caller->symbol.decl == callee->symbol.decl;
1334 }
1335
1336 /* Return true if the TM_CLONE bit is set for a given FNDECL.  */
1337 static inline bool
1338 decl_is_tm_clone (const_tree fndecl)
1339 {
1340   struct cgraph_node *n = cgraph_get_node (fndecl);
1341   if (n)
1342     return n->tm_clone;
1343   return false;
1344 }
1345
1346 /* Likewise indicate that a node is needed, i.e. reachable via some
1347    external means.  */
1348
1349 static inline void
1350 cgraph_mark_force_output_node (struct cgraph_node *node)
1351 {
1352   node->symbol.force_output = 1;
1353   gcc_checking_assert (!node->global.inlined_to);
1354 }
1355
1356 /* Return true when the symbol is real symbol, i.e. it is not inline clone
1357    or extern function kept around just for inlining.  */
1358
1359 static inline bool
1360 symtab_real_symbol_p (symtab_node node)
1361 {
1362   struct cgraph_node *cnode;
1363
1364   if (!is_a <cgraph_node> (node))
1365     return true;
1366   cnode = cgraph (node);
1367   if (cnode->global.inlined_to)
1368     return false;
1369   if (cnode->abstract_and_needed)
1370     return false;
1371   return true;
1372 }
1373 #endif  /* GCC_CGRAPH_H  */