gcc/cgraph.h

   1 /* Callgraph handling code.
   2    Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
   3    Free Software Foundation, Inc.
   4    Contributed by Jan Hubicka
   5
   6 This file is part of GCC.
   7
   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
  11 version.
  12
  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
  16 for more details.
  17
  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/>.  */
  21
  22 #ifndef GCC_CGRAPH_H
  23 #define GCC_CGRAPH_H
  24
  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"    /* FIXME: inappropriate dependency of cgraph on IPA.  */
  31
  32 enum availability
  33 {
  34   /* Not yet set by cgraph_function_body_availability.  */
  35   AVAIL_UNSET,
  36   /* Function body/variable initializer is unknown.  */
  37   AVAIL_NOT_AVAILABLE,
  38   /* Function body/variable initializer is known but might be replaced
  39      by a different one from other compilation unit and thus needs to
  40      be dealt with a care.  Like AVAIL_NOT_AVAILABLE it can have
  41      arbitrary side effects on escaping variables and functions, while
  42      like AVAILABLE it might access static variables.  */
  43   AVAIL_OVERWRITABLE,
  44   /* Function body/variable initializer is known and will be used in final
  45      program.  */
  46   AVAIL_AVAILABLE,
  47   /* Function body/variable initializer is known and all it's uses are explicitly
  48      visible within current unit (ie it's address is never taken and it is not
  49      exported to other units).
  50      Currently used only for functions.  */
  51   AVAIL_LOCAL
  52 };
  53
  54 /* This is the information that is put into the cgraph local structure
  55    to recover a function.  */
  56 struct lto_file_decl_data;
  57
  58 extern const char * const cgraph_availability_names[];
  59
  60 /* Function inlining information.  */
  61
  62 struct GTY(()) inline_summary
  63 {
  64   /* Estimated stack frame consumption by the function.  */
  65   HOST_WIDE_INT estimated_self_stack_size;
  66
  67   /* Size of the function body.  */
  68   int self_size;
  69   /* How many instructions are likely going to disappear after inlining.  */
  70   int size_inlining_benefit;
  71   /* Estimated time spent executing the function body.  */
  72   int self_time;
  73   /* How much time is going to be saved by inlining.  */
  74   int time_inlining_benefit;
  75 };
  76
  77 /* Information about thunk, used only for same body aliases.  */
  78
  79 struct GTY(()) cgraph_thunk_info {
  80   /* Information about the thunk.  */
  81   HOST_WIDE_INT fixed_offset;
  82   HOST_WIDE_INT virtual_value;
  83   tree alias;
  84   bool this_adjusting;
  85   bool virtual_offset_p;
  86   /* Set to true when alias node is thunk.  */
  87   bool thunk_p;
  88 };
  89
  90 /* Information about the function collected locally.
  91    Available after function is analyzed.  */
  92
  93 struct GTY(()) cgraph_local_info {
  94   /* File stream where this node is being written to.  */
  95   struct lto_file_decl_data * lto_file_data;
  96
  97   struct inline_summary inline_summary;
  98
  99   /* Set when function function is visible in current compilation unit only
 100      and its address is never taken.  */
 101   unsigned local : 1;
 102
 103   /* Set when function is visible by other units.  */
 104   unsigned externally_visible : 1;
 105
 106   /* Set once it has been finalized so we consider it to be output.  */
 107   unsigned finalized : 1;
 108
 109   /* False when there something makes inlining impossible (such as va_arg).  */
 110   unsigned inlinable : 1;
 111
 112   /* False when there something makes versioning impossible.
 113      Currently computed and used only by ipa-cp.  */
 114   unsigned versionable : 1;
 115
 116   /* True when function should be inlined independently on its size.  */
 117   unsigned disregard_inline_limits : 1;
 118
 119   /* True when the function has been originally extern inline, but it is
 120      redefined now.  */
 121   unsigned redefined_extern_inline : 1;
 122
 123   /* True if the function is going to be emitted in some other translation
 124      unit, referenced from vtable.  */
 125   unsigned vtable_method : 1;
 126 };
 127
 128 /* Information about the function that needs to be computed globally
 129    once compilation is finished.  Available only with -funit-at-a-time.  */
 130
 131 struct GTY(()) cgraph_global_info {
 132   /* Estimated stack frame consumption by the function.  */
 133   HOST_WIDE_INT estimated_stack_size;
 134   /* Expected offset of the stack frame of inlined function.  */
 135   HOST_WIDE_INT stack_frame_offset;
 136
 137   /* For inline clones this points to the function they will be
 138      inlined into.  */
 139   struct cgraph_node *inlined_to;
 140
 141   /* Estimated size of the function after inlining.  */
 142   int time;
 143   int size;
 144
 145   /* Estimated growth after inlining.  INT_MIN if not computed.  */
 146   int estimated_growth;
 147 };
 148
 149 /* Information about the function that is propagated by the RTL backend.
 150    Available only for functions that has been already assembled.  */
 151
 152 struct GTY(()) cgraph_rtl_info {
 153    unsigned int preferred_incoming_stack_boundary;
 154 };
 155
 156 /* Represent which DECL tree (or reference to such tree)
 157    will be replaced by another tree while versioning.  */
 158 struct GTY(()) ipa_replace_map
 159 {
 160   /* The tree that will be replaced.  */
 161   tree old_tree;
 162   /* The new (replacing) tree.  */
 163   tree new_tree;
 164   /* Parameter number to replace, when old_tree is NULL.  */
 165   int parm_num;
 166   /* True when a substitution should be done, false otherwise.  */
 167   bool replace_p;
 168   /* True when we replace a reference to old_tree.  */
 169   bool ref_p;
 170 };
 171 typedef struct ipa_replace_map *ipa_replace_map_p;
 172 DEF_VEC_P(ipa_replace_map_p);
 173 DEF_VEC_ALLOC_P(ipa_replace_map_p,gc);
 174
 175 struct GTY(()) cgraph_clone_info
 176 {
 177   VEC(ipa_replace_map_p,gc)* tree_map;
 178   bitmap args_to_skip;
 179   bitmap combined_args_to_skip;
 180 };
 181
 182 enum node_frequency {
 183   /* This function most likely won't be executed at all.
 184      (set only when profile feedback is available or via function attribute). */
 185   NODE_FREQUENCY_UNLIKELY_EXECUTED,
 186   /* For functions that are known to be executed once (i.e. constructors, destructors
 187      and main function.  */
 188   NODE_FREQUENCY_EXECUTED_ONCE,
 189   /* The default value.  */
 190   NODE_FREQUENCY_NORMAL,
 191   /* Optimize this function hard
 192      (set only when profile feedback is available or via function attribute). */
 193   NODE_FREQUENCY_HOT
 194 };
 195
 196
 197 /* The cgraph data structure.
 198    Each function decl has assigned cgraph_node listing callees and callers.  */
 199
 200 struct GTY((chain_next ("%h.next"), chain_prev ("%h.previous"))) cgraph_node {
 201   tree decl;
 202   struct cgraph_edge *callees;
 203   struct cgraph_edge *callers;
 204   struct cgraph_node *next;
 205   struct cgraph_node *previous;
 206   /* List of edges representing indirect calls with a yet undetermined
 207      callee.  */
 208   struct cgraph_edge *indirect_calls;
 209   /* For nested functions points to function the node is nested in.  */
 210   struct cgraph_node *origin;
 211   /* Points to first nested function, if any.  */
 212   struct cgraph_node *nested;
 213   /* Pointer to the next function with same origin, if any.  */
 214   struct cgraph_node *next_nested;
 215   /* Pointer to the next function in cgraph_nodes_queue.  */
 216   struct cgraph_node *next_needed;
 217   /* Pointer to the next clone.  */
 218   struct cgraph_node *next_sibling_clone;
 219   struct cgraph_node *prev_sibling_clone;
 220   struct cgraph_node *clones;
 221   struct cgraph_node *clone_of;
 222   /* For normal nodes pointer to the list of alias and thunk nodes,
 223      in alias/thunk nodes pointer to the normal node.  */
 224   struct cgraph_node *same_body;
 225   /* Circular list of nodes in the same comdat group if non-NULL.  */
 226   struct cgraph_node *same_comdat_group;
 227   /* For functions with many calls sites it holds map from call expression
 228      to the edge to speed up cgraph_edge function.  */
 229   htab_t GTY((param_is (struct cgraph_edge))) call_site_hash;
 230   /* Declaration node used to be clone of. */
 231   tree former_clone_of;
 232
 233   PTR GTY ((skip)) aux;
 234
 235   /* Interprocedural passes scheduled to have their transform functions
 236      applied next time we execute local pass on them.  We maintain it
 237      per-function in order to allow IPA passes to introduce new functions.  */
 238   VEC(ipa_opt_pass,heap) * GTY((skip)) ipa_transforms_to_apply;
 239
 240   struct ipa_ref_list ref_list;
 241   struct cgraph_local_info local;
 242   struct cgraph_global_info global;
 243   struct cgraph_rtl_info rtl;
 244   struct cgraph_clone_info clone;
 245   struct cgraph_thunk_info thunk;
 246
 247   /* Expected number of executions: calculated in profile.c.  */
 248   gcov_type count;
 249   /* Unique id of the node.  */
 250   int uid;
 251   /* Ordering of all cgraph nodes.  */
 252   int order;
 253
 254   /* unique id for profiling. pid is not suitable because of different
 255      number of cfg nodes with -fprofile-generate and -fprofile-use */
 256   int pid;
 257   enum ld_plugin_symbol_resolution resolution;
 258
 259   /* Set when function must be output for some reason.  The primary
 260      use of this flag is to mark functions needed to be output for
 261      non-standard reason.  Functions that are externally visible
 262      or reachable from functions needed to be output are marked
 263      by specialized flags.  */
 264   unsigned needed : 1;
 265   /* Set when function has address taken.
 266      In current implementation it imply needed flag. */
 267   unsigned address_taken : 1;
 268   /* Set when decl is an abstract function pointed to by the
 269      ABSTRACT_DECL_ORIGIN of a reachable function.  */
 270   unsigned abstract_and_needed : 1;
 271   /* Set when function is reachable by call from other function
 272      that is either reachable or needed.
 273      This flag is computed at original cgraph construction and then
 274      updated in cgraph_remove_unreachable_nodes.  Note that after
 275      cgraph_remove_unreachable_nodes cgraph still can contain unreachable
 276      nodes when they are needed for virtual clone instantiation.  */
 277   unsigned reachable : 1;
 278   /* Set when function is reachable by call from other LTRANS partition.  */
 279   unsigned reachable_from_other_partition : 1;
 280   /* Set once the function is lowered (i.e. its CFG is built).  */
 281   unsigned lowered : 1;
 282   /* Set once the function has been instantiated and its callee
 283      lists created.  */
 284   unsigned analyzed : 1;
 285   /* Set when function is available in the other LTRANS partition.
 286      During WPA output it is used to mark nodes that are present in
 287      multiple partitions.  */
 288   unsigned in_other_partition : 1;
 289   /* Set when function is scheduled to be processed by local passes.  */
 290   unsigned process : 1;
 291   /* Set for aliases once they got through assemble_alias.  */
 292   unsigned alias : 1;
 293   /* Set for nodes that was constructed and finalized by frontend.  */
 294   unsigned finalized_by_frontend : 1;
 295   /* Set for alias and thunk nodes, same_body points to the node they are alias
 296      of and they are linked through the next/previous pointers.  */
 297   unsigned same_body_alias : 1;
 298   /* How commonly executed the node is.  Initialized during branch
 299      probabilities pass.  */
 300   ENUM_BITFIELD (node_frequency) frequency : 2;
 301   /* True when function can only be called at startup (from static ctor).  */
 302   unsigned only_called_at_startup : 1;
 303   /* True when function can only be called at startup (from static dtor).  */
 304   unsigned only_called_at_exit : 1;
 305 };
 306
 307 typedef struct cgraph_node *cgraph_node_ptr;
 308
 309 DEF_VEC_P(cgraph_node_ptr);
 310 DEF_VEC_ALLOC_P(cgraph_node_ptr,heap);
 311 DEF_VEC_ALLOC_P(cgraph_node_ptr,gc);
 312
 313 /* A cgraph node set is a collection of cgraph nodes.  A cgraph node
 314    can appear in multiple sets.  */
 315 struct GTY(()) cgraph_node_set_def
 316 {
 317   htab_t GTY((param_is (struct cgraph_node_set_element_def))) hashtab;
 318   VEC(cgraph_node_ptr, gc) *nodes;
 319 };
 320
 321 typedef struct varpool_node *varpool_node_ptr;
 322
 323 DEF_VEC_P(varpool_node_ptr);
 324 DEF_VEC_ALLOC_P(varpool_node_ptr,heap);
 325 DEF_VEC_ALLOC_P(varpool_node_ptr,gc);
 326
 327 /* A varpool node set is a collection of varpool nodes.  A varpool node
 328    can appear in multiple sets.  */
 329 struct GTY(()) varpool_node_set_def
 330 {
 331   htab_t GTY((param_is (struct varpool_node_set_element_def))) hashtab;
 332   VEC(varpool_node_ptr, gc) *nodes;
 333 };
 334
 335 typedef struct cgraph_node_set_def *cgraph_node_set;
 336
 337 DEF_VEC_P(cgraph_node_set);
 338 DEF_VEC_ALLOC_P(cgraph_node_set,gc);
 339 DEF_VEC_ALLOC_P(cgraph_node_set,heap);
 340
 341 typedef struct varpool_node_set_def *varpool_node_set;
 342
 343 DEF_VEC_P(varpool_node_set);
 344 DEF_VEC_ALLOC_P(varpool_node_set,gc);
 345 DEF_VEC_ALLOC_P(varpool_node_set,heap);
 346
 347 /* A cgraph node set element contains an index in the vector of nodes in
 348    the set.  */
 349 struct GTY(()) cgraph_node_set_element_def
 350 {
 351   struct cgraph_node *node;
 352   HOST_WIDE_INT index;
 353 };
 354
 355 typedef struct cgraph_node_set_element_def *cgraph_node_set_element;
 356 typedef const struct cgraph_node_set_element_def *const_cgraph_node_set_element;
 357
 358 /* Iterator structure for cgraph node sets.  */
 359 typedef struct
 360 {
 361   cgraph_node_set set;
 362   unsigned index;
 363 } cgraph_node_set_iterator;
 364
 365 /* A varpool node set element contains an index in the vector of nodes in
 366    the set.  */
 367 struct GTY(()) varpool_node_set_element_def
 368 {
 369   struct varpool_node *node;
 370   HOST_WIDE_INT index;
 371 };
 372
 373 typedef struct varpool_node_set_element_def *varpool_node_set_element;
 374 typedef const struct varpool_node_set_element_def *const_varpool_node_set_element;
 375
 376 /* Iterator structure for varpool node sets.  */
 377 typedef struct
 378 {
 379   varpool_node_set set;
 380   unsigned index;
 381 } varpool_node_set_iterator;
 382
 383 #define DEFCIFCODE(code, string)        CIF_ ## code,
 384 /* Reasons for inlining failures.  */
 385 typedef enum {
 386 #include "cif-code.def"
 387   CIF_N_REASONS
 388 } cgraph_inline_failed_t;
 389
 390 /* Structure containing additional information about an indirect call.  */
 391
 392 struct GTY(()) cgraph_indirect_call_info
 393 {
 394   /* Offset accumulated from ancestor jump functions of inlined call graph
 395      edges.  */
 396   HOST_WIDE_INT anc_offset;
 397   /* OBJ_TYPE_REF_TOKEN of a polymorphic call (if polymorphic is set).  */
 398   HOST_WIDE_INT otr_token;
 399   /* Type of the object from OBJ_TYPE_REF_OBJECT. */
 400   tree otr_type;
 401   /* Index of the parameter that is called.  */
 402   int param_index;
 403   /* ECF flags determined from the caller.  */
 404   int ecf_flags;
 405
 406   /* Set when the call is a virtual call with the parameter being the
 407      associated object pointer rather than a simple direct call.  */
 408   unsigned polymorphic : 1;
 409 };
 410
 411 struct GTY((chain_next ("%h.next_caller"), chain_prev ("%h.prev_caller"))) cgraph_edge {
 412   /* Expected number of executions: calculated in profile.c.  */
 413   gcov_type count;
 414   struct cgraph_node *caller;
 415   struct cgraph_node *callee;
 416   struct cgraph_edge *prev_caller;
 417   struct cgraph_edge *next_caller;
 418   struct cgraph_edge *prev_callee;
 419   struct cgraph_edge *next_callee;
 420   gimple call_stmt;
 421   /* Additional information about an indirect call.  Not cleared when an edge
 422      becomes direct.  */
 423   struct cgraph_indirect_call_info *indirect_info;
 424   PTR GTY ((skip (""))) aux;
 425   /* When equal to CIF_OK, inline this call.  Otherwise, points to the
 426      explanation why function was not inlined.  */
 427   cgraph_inline_failed_t inline_failed;
 428   /* The stmt_uid of call_stmt.  This is used by LTO to recover the call_stmt
 429      when the function is serialized in.  */
 430   unsigned int lto_stmt_uid;
 431   /* Expected frequency of executions within the function.
 432      When set to CGRAPH_FREQ_BASE, the edge is expected to be called once
 433      per function call.  The range is 0 to CGRAPH_FREQ_MAX.  */
 434   int frequency;
 435   /* Unique id of the edge.  */
 436   int uid;
 437   /* Depth of loop nest, 1 means no loop nest.  */
 438   unsigned short int loop_nest;
 439   /* Whether this edge was made direct by indirect inlining.  */
 440   unsigned int indirect_inlining_edge : 1;
 441   /* Whether this edge describes an indirect call with an undetermined
 442      callee.  */
 443   unsigned int indirect_unknown_callee : 1;
 444   /* Whether this edge is still a dangling  */
 445   /* True if the corresponding CALL stmt cannot be inlined.  */
 446   unsigned int call_stmt_cannot_inline_p : 1;
 447   /* Can this call throw externally?  */
 448   unsigned int can_throw_external : 1;
 449 };
 450
 451 #define CGRAPH_FREQ_BASE 1000
 452 #define CGRAPH_FREQ_MAX 100000
 453
 454 typedef struct cgraph_edge *cgraph_edge_p;
 455
 456 DEF_VEC_P(cgraph_edge_p);
 457 DEF_VEC_ALLOC_P(cgraph_edge_p,heap);
 458
 459 /* The varpool data structure.
 460    Each static variable decl has assigned varpool_node.  */
 461
 462 struct GTY((chain_next ("%h.next"), chain_prev ("%h.prev"))) varpool_node {
 463   tree decl;
 464   /* Pointer to the next function in varpool_nodes.  */
 465   struct varpool_node *next, *prev;
 466   /* Pointer to the next function in varpool_nodes_queue.  */
 467   struct varpool_node *next_needed, *prev_needed;
 468   /* For normal nodes a pointer to the first extra name alias.  For alias
 469      nodes a pointer to the normal node.  */
 470   struct varpool_node *extra_name;
 471   /* Circular list of nodes in the same comdat group if non-NULL.  */
 472   struct varpool_node *same_comdat_group;
 473   struct ipa_ref_list ref_list;
 474   /* File stream where this node is being written to.  */
 475   struct lto_file_decl_data * lto_file_data;
 476   PTR GTY ((skip)) aux;
 477   /* Ordering of all cgraph nodes.  */
 478   int order;
 479   enum ld_plugin_symbol_resolution resolution;
 480
 481   /* Set when function must be output - it is externally visible
 482      or its address is taken.  */
 483   unsigned needed : 1;
 484   /* Needed variables might become dead by optimization.  This flag
 485      forces the variable to be output even if it appears dead otherwise.  */
 486   unsigned force_output : 1;
 487   /* Set once the variable has been instantiated and its callee
 488      lists created.  */
 489   unsigned analyzed : 1;
 490   /* Set once it has been finalized so we consider it to be output.  */
 491   unsigned finalized : 1;
 492   /* Set when variable is scheduled to be assembled.  */
 493   unsigned output : 1;
 494   /* Set when function is visible by other units.  */
 495   unsigned externally_visible : 1;
 496   /* Set for aliases once they got through assemble_alias.  Also set for
 497      extra name aliases in varpool_extra_name_alias.  */
 498   unsigned alias : 1;
 499   /* Set when variable is used from other LTRANS partition.  */
 500   unsigned used_from_other_partition : 1;
 501   /* Set when variable is available in the other LTRANS partition.
 502      During WPA output it is used to mark nodes that are present in
 503      multiple partitions.  */
 504   unsigned in_other_partition : 1;
 505 };
 506
 507 /* Every top level asm statement is put into a cgraph_asm_node.  */
 508
 509 struct GTY(()) cgraph_asm_node {
 510   /* Next asm node.  */
 511   struct cgraph_asm_node *next;
 512   /* String for this asm node.  */
 513   tree asm_str;
 514   /* Ordering of all cgraph nodes.  */
 515   int order;
 516 };
 517
 518 extern GTY(()) struct cgraph_node *cgraph_nodes;
 519 extern GTY(()) int cgraph_n_nodes;
 520 extern GTY(()) int cgraph_max_uid;
 521 extern GTY(()) int cgraph_edge_max_uid;
 522 extern GTY(()) int cgraph_max_pid;
 523 extern bool cgraph_global_info_ready;
 524 enum cgraph_state
 525 {
 526   /* Callgraph is being constructed.  It is safe to add new functions.  */
 527   CGRAPH_STATE_CONSTRUCTION,
 528   /* Callgraph is built and IPA passes are being run.  */
 529   CGRAPH_STATE_IPA,
 530   /* Callgraph is built and all functions are transformed to SSA form.  */
 531   CGRAPH_STATE_IPA_SSA,
 532   /* Functions are now ordered and being passed to RTL expanders.  */
 533   CGRAPH_STATE_EXPANSION,
 534   /* All cgraph expansion is done.  */
 535   CGRAPH_STATE_FINISHED
 536 };
 537 extern enum cgraph_state cgraph_state;
 538 extern bool cgraph_function_flags_ready;
 539 extern GTY(()) struct cgraph_node *cgraph_nodes_queue;
 540 extern GTY(()) struct cgraph_node *cgraph_new_nodes;
 541
 542 extern GTY(()) struct cgraph_asm_node *cgraph_asm_nodes;
 543 extern GTY(()) int cgraph_order;
 544
 545 /* In cgraph.c  */
 546 void dump_cgraph (FILE *);
 547 void debug_cgraph (void);
 548 void dump_cgraph_node (FILE *, struct cgraph_node *);
 549 void debug_cgraph_node (struct cgraph_node *);
 550 void cgraph_insert_node_to_hashtable (struct cgraph_node *node);
 551 void cgraph_remove_edge (struct cgraph_edge *);
 552 void cgraph_remove_node (struct cgraph_node *);
 553 void cgraph_remove_node_and_inline_clones (struct cgraph_node *);
 554 void cgraph_release_function_body (struct cgraph_node *);
 555 void cgraph_node_remove_callees (struct cgraph_node *node);
 556 struct cgraph_edge *cgraph_create_edge (struct cgraph_node *,
 557                                         struct cgraph_node *,
 558                                         gimple, gcov_type, int, int);
 559 struct cgraph_edge *cgraph_create_indirect_edge (struct cgraph_node *, gimple, int,
 560                                                  gcov_type, int, int);
 561 struct cgraph_node * cgraph_get_node (const_tree);
 562 struct cgraph_node * cgraph_get_node_or_alias (const_tree);
 563 struct cgraph_node * cgraph_node (tree);
 564 struct cgraph_node * cgraph_same_body_alias (tree, tree);
 565 struct cgraph_node * cgraph_add_thunk (tree, tree, bool, HOST_WIDE_INT,
 566                                        HOST_WIDE_INT, tree, tree);
 567 void cgraph_remove_same_body_alias (struct cgraph_node *);
 568 struct cgraph_node *cgraph_node_for_asm (tree);
 569 struct cgraph_edge *cgraph_edge (struct cgraph_node *, gimple);
 570 void cgraph_set_call_stmt (struct cgraph_edge *, gimple);
 571 void cgraph_set_call_stmt_including_clones (struct cgraph_node *, gimple, gimple);
 572 void cgraph_create_edge_including_clones (struct cgraph_node *,
 573                                           struct cgraph_node *,
 574                                           gimple, gimple, gcov_type, int, int,
 575                                           cgraph_inline_failed_t);
 576 void cgraph_update_edges_for_call_stmt (gimple, tree, gimple);
 577 struct cgraph_local_info *cgraph_local_info (tree);
 578 struct cgraph_global_info *cgraph_global_info (tree);
 579 struct cgraph_rtl_info *cgraph_rtl_info (tree);
 580 const char * cgraph_node_name (struct cgraph_node *);
 581 struct cgraph_edge * cgraph_clone_edge (struct cgraph_edge *,
 582                                         struct cgraph_node *, gimple,
 583                                         unsigned, gcov_type, int, int, bool);
 584 struct cgraph_node * cgraph_clone_node (struct cgraph_node *, tree, gcov_type, int,
 585                                         int, bool, VEC(cgraph_edge_p,heap) *);
 586
 587 void cgraph_redirect_edge_callee (struct cgraph_edge *, struct cgraph_node *);
 588 void cgraph_make_edge_direct (struct cgraph_edge *, struct cgraph_node *);
 589
 590 struct cgraph_asm_node *cgraph_add_asm_node (tree);
 591
 592 bool cgraph_function_possibly_inlined_p (tree);
 593 void cgraph_unnest_node (struct cgraph_node *);
 594
 595 enum availability cgraph_function_body_availability (struct cgraph_node *);
 596 void cgraph_add_new_function (tree, bool);
 597 const char* cgraph_inline_failed_string (cgraph_inline_failed_t);
 598 struct cgraph_node * cgraph_create_virtual_clone (struct cgraph_node *old_node,
 599                                                   VEC(cgraph_edge_p,heap)*,
 600                                                   VEC(ipa_replace_map_p,gc)* tree_map,
 601                                                   bitmap args_to_skip,
 602                                                   const char *clone_name);
 603
 604 void cgraph_set_nothrow_flag (struct cgraph_node *, bool);
 605 void cgraph_set_const_flag (struct cgraph_node *, bool, bool);
 606 void cgraph_set_pure_flag (struct cgraph_node *, bool, bool);
 607 tree clone_function_name (tree decl, const char *);
 608 bool cgraph_node_cannot_return (struct cgraph_node *);
 609 bool cgraph_edge_cannot_lead_to_return (struct cgraph_edge *);
 610 bool cgraph_will_be_removed_from_program_if_no_direct_calls
 611   (struct cgraph_node *node);
 612 bool cgraph_can_remove_if_no_direct_calls_and_refs_p
 613   (struct cgraph_node *node);
 614 bool resolution_used_from_other_file_p (enum ld_plugin_symbol_resolution resolution);
 615 bool cgraph_used_from_object_file_p (struct cgraph_node *node);
 616 bool varpool_used_from_object_file_p (struct varpool_node *node);
 617
 618 /* In cgraphunit.c  */
 619 extern FILE *cgraph_dump_file;
 620 void cgraph_finalize_function (tree, bool);
 621 void cgraph_mark_if_needed (tree);
 622 void cgraph_finalize_compilation_unit (void);
 623 void cgraph_optimize (void);
 624 void cgraph_mark_needed_node (struct cgraph_node *);
 625 void cgraph_mark_address_taken_node (struct cgraph_node *);
 626 void cgraph_mark_reachable_node (struct cgraph_node *);
 627 bool cgraph_inline_p (struct cgraph_edge *, cgraph_inline_failed_t *reason);
 628 bool cgraph_preserve_function_body_p (tree);
 629 void verify_cgraph (void);
 630 void verify_cgraph_node (struct cgraph_node *);
 631 void cgraph_build_static_cdtor (char which, tree body, int priority);
 632 void cgraph_reset_static_var_maps (void);
 633 void init_cgraph (void);
 634 struct cgraph_node *cgraph_function_versioning (struct cgraph_node *,
 635                                                 VEC(cgraph_edge_p,heap)*,
 636                                                 VEC(ipa_replace_map_p,gc)*,
 637                                                 bitmap, bitmap, basic_block,
 638                                                 const char *);
 639 void tree_function_versioning (tree, tree, VEC (ipa_replace_map_p,gc)*, bool, bitmap,
 640                                bitmap, basic_block);
 641 struct cgraph_node *save_inline_function_body (struct cgraph_node *);
 642 void record_references_in_initializer (tree, bool);
 643 bool cgraph_process_new_functions (void);
 644
 645 bool cgraph_decide_is_function_needed (struct cgraph_node *, tree);
 646
 647 typedef void (*cgraph_edge_hook)(struct cgraph_edge *, void *);
 648 typedef void (*cgraph_node_hook)(struct cgraph_node *, void *);
 649 typedef void (*cgraph_2edge_hook)(struct cgraph_edge *, struct cgraph_edge *,
 650                                   void *);
 651 typedef void (*cgraph_2node_hook)(struct cgraph_node *, struct cgraph_node *,
 652                                   void *);
 653 struct cgraph_edge_hook_list;
 654 struct cgraph_node_hook_list;
 655 struct cgraph_2edge_hook_list;
 656 struct cgraph_2node_hook_list;
 657 struct cgraph_edge_hook_list *cgraph_add_edge_removal_hook (cgraph_edge_hook, void *);
 658 void cgraph_remove_edge_removal_hook (struct cgraph_edge_hook_list *);
 659 struct cgraph_node_hook_list *cgraph_add_node_removal_hook (cgraph_node_hook,
 660                                                             void *);
 661 void cgraph_remove_node_removal_hook (struct cgraph_node_hook_list *);
 662 struct cgraph_node_hook_list *cgraph_add_function_insertion_hook (cgraph_node_hook,
 663                                                                   void *);
 664 void cgraph_remove_function_insertion_hook (struct cgraph_node_hook_list *);
 665 void cgraph_call_function_insertion_hooks (struct cgraph_node *node);
 666 struct cgraph_2edge_hook_list *cgraph_add_edge_duplication_hook (cgraph_2edge_hook, void *);
 667 void cgraph_remove_edge_duplication_hook (struct cgraph_2edge_hook_list *);
 668 struct cgraph_2node_hook_list *cgraph_add_node_duplication_hook (cgraph_2node_hook, void *);
 669 void cgraph_remove_node_duplication_hook (struct cgraph_2node_hook_list *);
 670 void cgraph_materialize_all_clones (void);
 671 gimple cgraph_redirect_edge_call_stmt_to_callee (struct cgraph_edge *);
 672 bool cgraph_propagate_frequency (struct cgraph_node *node);
 673 /* In cgraphbuild.c  */
 674 unsigned int rebuild_cgraph_edges (void);
 675 void cgraph_rebuild_references (void);
 676 void reset_inline_failed (struct cgraph_node *);
 677 int compute_call_stmt_bb_frequency (tree, basic_block bb);
 678
 679 /* In ipa.c  */
 680 bool cgraph_remove_unreachable_nodes (bool, FILE *);
 681 int cgraph_postorder (struct cgraph_node **);
 682 cgraph_node_set cgraph_node_set_new (void);
 683 cgraph_node_set_iterator cgraph_node_set_find (cgraph_node_set,
 684                                                struct cgraph_node *);
 685 void cgraph_node_set_add (cgraph_node_set, struct cgraph_node *);
 686 void cgraph_node_set_remove (cgraph_node_set, struct cgraph_node *);
 687 void dump_cgraph_node_set (FILE *, cgraph_node_set);
 688 void debug_cgraph_node_set (cgraph_node_set);
 689
 690 varpool_node_set varpool_node_set_new (void);
 691 varpool_node_set_iterator varpool_node_set_find (varpool_node_set,
 692                                                struct varpool_node *);
 693 void varpool_node_set_add (varpool_node_set, struct varpool_node *);
 694 void varpool_node_set_remove (varpool_node_set, struct varpool_node *);
 695 void dump_varpool_node_set (FILE *, varpool_node_set);
 696 void debug_varpool_node_set (varpool_node_set);
 697 void ipa_discover_readonly_nonaddressable_vars (void);
 698
 699 /* In predict.c  */
 700 bool cgraph_maybe_hot_edge_p (struct cgraph_edge *e);
 701
 702 /* In varpool.c  */
 703 extern GTY(()) struct varpool_node *varpool_nodes_queue;
 704 extern GTY(()) struct varpool_node *varpool_nodes;
 705
 706 struct varpool_node *varpool_node (tree);
 707 struct varpool_node *varpool_node_for_asm (tree asmname);
 708 void varpool_mark_needed_node (struct varpool_node *);
 709 void debug_varpool (void);
 710 void dump_varpool (FILE *);
 711 void dump_varpool_node (FILE *, struct varpool_node *);
 712
 713 void varpool_finalize_decl (tree);
 714 bool decide_is_variable_needed (struct varpool_node *, tree);
 715 enum availability cgraph_variable_initializer_availability (struct varpool_node *);
 716 void cgraph_make_decl_local (tree);
 717 void cgraph_make_node_local (struct cgraph_node *);
 718 bool cgraph_node_can_be_local_p (struct cgraph_node *);
 719
 720
 721 struct varpool_node * varpool_get_node (const_tree decl);
 722 void varpool_remove_node (struct varpool_node *node);
 723 bool varpool_assemble_pending_decls (void);
 724 bool varpool_assemble_decl (struct varpool_node *node);
 725 bool varpool_analyze_pending_decls (void);
 726 void varpool_remove_unreferenced_decls (void);
 727 void varpool_empty_needed_queue (void);
 728 struct varpool_node * varpool_extra_name_alias (tree, tree);
 729 const char * varpool_node_name (struct varpool_node *node);
 730 void varpool_reset_queue (void);
 731 bool const_value_known_p (tree);
 732
 733 /* Walk all reachable static variables.  */
 734 #define FOR_EACH_STATIC_VARIABLE(node) \
 735    for ((node) = varpool_nodes_queue; (node); (node) = (node)->next_needed)
 736
 737 /* Return first reachable static variable with initializer.  */
 738 static inline struct varpool_node *
 739 varpool_first_static_initializer (void)
 740 {
 741   struct varpool_node *node;
 742   for (node = varpool_nodes_queue; node; node = node->next_needed)
 743     {
 744       gcc_checking_assert (TREE_CODE (node->decl) == VAR_DECL);
 745       if (DECL_INITIAL (node->decl))
 746         return node;
 747     }
 748   return NULL;
 749 }
 750
 751 /* Return next reachable static variable with initializer after NODE.  */
 752 static inline struct varpool_node *
 753 varpool_next_static_initializer (struct varpool_node *node)
 754 {
 755   for (node = node->next_needed; node; node = node->next_needed)
 756     {
 757       gcc_checking_assert (TREE_CODE (node->decl) == VAR_DECL);
 758       if (DECL_INITIAL (node->decl))
 759         return node;
 760     }
 761   return NULL;
 762 }
 763
 764 /* Walk all static variables with initializer set.  */
 765 #define FOR_EACH_STATIC_INITIALIZER(node) \
 766    for ((node) = varpool_first_static_initializer (); (node); \
 767         (node) = varpool_next_static_initializer (node))
 768
 769 /* In ipa-inline.c  */
 770 void cgraph_clone_inlined_nodes (struct cgraph_edge *, bool, bool);
 771 unsigned int compute_inline_parameters (struct cgraph_node *);
 772
 773
 774 /* Create a new static variable of type TYPE.  */
 775 tree add_new_static_var (tree type);
 776
 777 /* Return true if iterator CSI points to nothing.  */
 778 static inline bool
 779 csi_end_p (cgraph_node_set_iterator csi)
 780 {
 781   return csi.index >= VEC_length (cgraph_node_ptr, csi.set->nodes);
 782 }
 783
 784 /* Advance iterator CSI.  */
 785 static inline void
 786 csi_next (cgraph_node_set_iterator *csi)
 787 {
 788   csi->index++;
 789 }
 790
 791 /* Return the node pointed to by CSI.  */
 792 static inline struct cgraph_node *
 793 csi_node (cgraph_node_set_iterator csi)
 794 {
 795   return VEC_index (cgraph_node_ptr, csi.set->nodes, csi.index);
 796 }
 797
 798 /* Return an iterator to the first node in SET.  */
 799 static inline cgraph_node_set_iterator
 800 csi_start (cgraph_node_set set)
 801 {
 802   cgraph_node_set_iterator csi;
 803
 804   csi.set = set;
 805   csi.index = 0;
 806   return csi;
 807 }
 808
 809 /* Return true if SET contains NODE.  */
 810 static inline bool
 811 cgraph_node_in_set_p (struct cgraph_node *node, cgraph_node_set set)
 812 {
 813   cgraph_node_set_iterator csi;
 814   csi = cgraph_node_set_find (set, node);
 815   return !csi_end_p (csi);
 816 }
 817
 818 /* Return number of nodes in SET.  */
 819 static inline size_t
 820 cgraph_node_set_size (cgraph_node_set set)
 821 {
 822   return htab_elements (set->hashtab);
 823 }
 824
 825 /* Return true if iterator VSI points to nothing.  */
 826 static inline bool
 827 vsi_end_p (varpool_node_set_iterator vsi)
 828 {
 829   return vsi.index >= VEC_length (varpool_node_ptr, vsi.set->nodes);
 830 }
 831
 832 /* Advance iterator VSI.  */
 833 static inline void
 834 vsi_next (varpool_node_set_iterator *vsi)
 835 {
 836   vsi->index++;
 837 }
 838
 839 /* Return the node pointed to by VSI.  */
 840 static inline struct varpool_node *
 841 vsi_node (varpool_node_set_iterator vsi)
 842 {
 843   return VEC_index (varpool_node_ptr, vsi.set->nodes, vsi.index);
 844 }
 845
 846 /* Return an iterator to the first node in SET.  */
 847 static inline varpool_node_set_iterator
 848 vsi_start (varpool_node_set set)
 849 {
 850   varpool_node_set_iterator vsi;
 851
 852   vsi.set = set;
 853   vsi.index = 0;
 854   return vsi;
 855 }
 856
 857 /* Return true if SET contains NODE.  */
 858 static inline bool
 859 varpool_node_in_set_p (struct varpool_node *node, varpool_node_set set)
 860 {
 861   varpool_node_set_iterator vsi;
 862   vsi = varpool_node_set_find (set, node);
 863   return !vsi_end_p (vsi);
 864 }
 865
 866 /* Return number of nodes in SET.  */
 867 static inline size_t
 868 varpool_node_set_size (varpool_node_set set)
 869 {
 870   return htab_elements (set->hashtab);
 871 }
 872
 873 /* Uniquize all constants that appear in memory.
 874    Each constant in memory thus far output is recorded
 875    in `const_desc_table'.  */
 876
 877 struct GTY(()) constant_descriptor_tree {
 878   /* A MEM for the constant.  */
 879   rtx rtl;
 880
 881   /* The value of the constant.  */
 882   tree value;
 883
 884   /* Hash of value.  Computing the hash from value each time
 885      hashfn is called can't work properly, as that means recursive
 886      use of the hash table during hash table expansion.  */
 887   hashval_t hash;
 888 };
 889
 890 /* Return true if set is nonempty.  */
 891 static inline bool
 892 cgraph_node_set_nonempty_p (cgraph_node_set set)
 893 {
 894   return !VEC_empty (cgraph_node_ptr, set->nodes);
 895 }
 896
 897 /* Return true if set is nonempty.  */
 898 static inline bool
 899 varpool_node_set_nonempty_p (varpool_node_set set)
 900 {
 901   return !VEC_empty (varpool_node_ptr, set->nodes);
 902 }
 903
 904 /* Return true when function NODE is only called directly.
 905    i.e. it is not externally visible, address was not taken and
 906    it is not used in any other non-standard way.  */
 907
 908 static inline bool
 909 cgraph_only_called_directly_p (struct cgraph_node *node)
 910 {
 911   gcc_assert (!node->global.inlined_to);
 912   return (!node->needed && !node->address_taken
 913           && !node->reachable_from_other_partition
 914           && !DECL_STATIC_CONSTRUCTOR (node->decl)
 915           && !DECL_STATIC_DESTRUCTOR (node->decl)
 916           && !node->local.externally_visible);
 917 }
 918
 919 /* Return true when function NODE can be removed from callgraph
 920    if all direct calls are eliminated.  */
 921
 922 static inline bool
 923 cgraph_can_remove_if_no_direct_calls_p (struct cgraph_node *node)
 924 {
 925   /* Extern inlines can always go, we will use the external definition.  */
 926   if (DECL_EXTERNAL (node->decl))
 927     return true;
 928   return !node->address_taken && cgraph_can_remove_if_no_direct_calls_and_refs_p (node);
 929 }
 930
 931 /* Return true when all references to VNODE must be visible in ipa_ref_list.
 932    i.e. if the variable is not externally visible or not used in some magic
 933    way (asm statement or such).
 934    The magic uses are all sumarized in force_output flag.  */
 935
 936 static inline bool
 937 varpool_all_refs_explicit_p (struct varpool_node *vnode)
 938 {
 939   return (!vnode->externally_visible
 940           && !vnode->used_from_other_partition
 941           && !vnode->force_output);
 942 }
 943
 944 /* Constant pool accessor function.  */
 945 htab_t constant_pool_htab (void);
 946
 947 /* FIXME: inappropriate dependency of cgraph on IPA.  */
 948 #include "ipa-ref-inline.h"
 949
 950 #endif  /* GCC_CGRAPH_H  */