gcc/cgraph.h

   1 /* Callgraph handling code.
   2    Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009
   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 #include "tree.h"
  25 #include "basic-block.h"
  26
  27 enum availability
  28 {
  29   /* Not yet set by cgraph_function_body_availability.  */
  30   AVAIL_UNSET,
  31   /* Function body/variable initializer is unknown.  */
  32   AVAIL_NOT_AVAILABLE,
  33   /* Function body/variable initializer is known but might be replaced
  34      by a different one from other compilation unit and thus needs to
  35      be dealt with a care.  Like AVAIL_NOT_AVAILABLE it can have
  36      arbitrary side effects on escaping variables and functions, while
  37      like AVAILABLE it might access static variables.  */
  38   AVAIL_OVERWRITABLE,
  39   /* Function body/variable initializer is known and will be used in final
  40      program.  */
  41   AVAIL_AVAILABLE,
  42   /* Function body/variable initializer is known and all it's uses are explicitly
  43      visible within current unit (ie it's address is never taken and it is not
  44      exported to other units).
  45      Currently used only for functions.  */
  46   AVAIL_LOCAL
  47 };
  48
  49 /* This is the information that is put into the cgraph local structure
  50    to recover a function.  */
  51 struct lto_file_decl_data;
  52
  53 extern const char * const cgraph_availability_names[];
  54
  55 /* Function inlining information.  */
  56
  57 struct GTY(()) inline_summary
  58 {
  59   /* Estimated stack frame consumption by the function.  */
  60   HOST_WIDE_INT estimated_self_stack_size;
  61
  62   /* Size of the function body.  */
  63   int self_size;
  64   /* How many instructions are likely going to disappear after inlining.  */
  65   int size_inlining_benefit;
  66   /* Estimated time spent executing the function body.  */
  67   int self_time;
  68   /* How much time is going to be saved by inlining.  */
  69   int time_inlining_benefit;
  70 };
  71
  72 /* Information about the function collected locally.
  73    Available after function is analyzed.  */
  74
  75 struct GTY(()) cgraph_local_info {
  76   /* File stream where this node is being written to.  */
  77   struct lto_file_decl_data * GTY ((skip)) lto_file_data;
  78
  79   struct inline_summary inline_summary;
  80
  81   /* Set when function function is visible in current compilation unit only
  82      and its address is never taken.  */
  83   unsigned local : 1;
  84
  85   /* Set when function is visible by other units.  */
  86   unsigned externally_visible : 1;
  87
  88   /* Set once it has been finalized so we consider it to be output.  */
  89   unsigned finalized : 1;
  90
  91   /* False when there something makes inlining impossible (such as va_arg).  */
  92   unsigned inlinable : 1;
  93
  94   /* True when function should be inlined independently on its size.  */
  95   unsigned disregard_inline_limits : 1;
  96
  97   /* True when the function has been originally extern inline, but it is
  98      redefined now.  */
  99   unsigned redefined_extern_inline : 1;
 100
 101   /* True if statics_read_for_function and
 102      statics_written_for_function contain valid data.  */
 103   unsigned for_functions_valid : 1;
 104
 105   /* True if the function is going to be emitted in some other translation
 106      unit, referenced from vtable.  */
 107   unsigned vtable_method : 1;
 108 };
 109
 110 /* Information about the function that needs to be computed globally
 111    once compilation is finished.  Available only with -funit-at-a-time.  */
 112
 113 struct GTY(()) cgraph_global_info {
 114   /* Estimated stack frame consumption by the function.  */
 115   HOST_WIDE_INT estimated_stack_size;
 116   /* Expected offset of the stack frame of inlined function.  */
 117   HOST_WIDE_INT stack_frame_offset;
 118
 119   /* For inline clones this points to the function they will be
 120      inlined into.  */
 121   struct cgraph_node *inlined_to;
 122
 123   /* Estimated size of the function after inlining.  */
 124   int time;
 125   int size;
 126
 127   /* Estimated growth after inlining.  INT_MIN if not computed.  */
 128   int estimated_growth;
 129
 130   /* Set iff the function has been inlined at least once.  */
 131   bool inlined;
 132 };
 133
 134 /* Information about the function that is propagated by the RTL backend.
 135    Available only for functions that has been already assembled.  */
 136
 137 struct GTY(()) cgraph_rtl_info {
 138    unsigned int preferred_incoming_stack_boundary;
 139 };
 140
 141 /* Represent which DECL tree (or reference to such tree)
 142    will be replaced by another tree while versioning.  */
 143 struct GTY(()) ipa_replace_map
 144 {
 145   /* The tree that will be replaced.  */
 146   tree old_tree;
 147   /* The new (replacing) tree.  */
 148   tree new_tree;
 149   /* True when a substitution should be done, false otherwise.  */
 150   bool replace_p;
 151   /* True when we replace a reference to old_tree.  */
 152   bool ref_p;
 153 };
 154 typedef struct ipa_replace_map *ipa_replace_map_p;
 155 DEF_VEC_P(ipa_replace_map_p);
 156 DEF_VEC_ALLOC_P(ipa_replace_map_p,gc);
 157
 158 struct GTY(()) cgraph_clone_info
 159 {
 160   VEC(ipa_replace_map_p,gc)* tree_map;
 161   bitmap args_to_skip;
 162   bitmap combined_args_to_skip;
 163 };
 164
 165 /* The cgraph data structure.
 166    Each function decl has assigned cgraph_node listing callees and callers.  */
 167
 168 struct GTY((chain_next ("%h.next"), chain_prev ("%h.previous"))) cgraph_node {
 169   tree decl;
 170   struct cgraph_edge *callees;
 171   struct cgraph_edge *callers;
 172   struct cgraph_node *next;
 173   struct cgraph_node *previous;
 174   /* For nested functions points to function the node is nested in.  */
 175   struct cgraph_node *origin;
 176   /* Points to first nested function, if any.  */
 177   struct cgraph_node *nested;
 178   /* Pointer to the next function with same origin, if any.  */
 179   struct cgraph_node *next_nested;
 180   /* Pointer to the next function in cgraph_nodes_queue.  */
 181   struct cgraph_node *next_needed;
 182   /* Pointer to the next clone.  */
 183   struct cgraph_node *next_sibling_clone;
 184   struct cgraph_node *prev_sibling_clone;
 185   struct cgraph_node *clones;
 186   struct cgraph_node *clone_of;
 187   /* For normal nodes pointer to the list of alias nodes, in alias
 188      nodes pointer to the normal node.  */
 189   struct cgraph_node *same_body;
 190   /* For functions with many calls sites it holds map from call expression
 191      to the edge to speed up cgraph_edge function.  */
 192   htab_t GTY((param_is (struct cgraph_edge))) call_site_hash;
 193
 194   PTR GTY ((skip)) aux;
 195
 196   /* Interprocedural passes scheduled to have their transform functions
 197      applied next time we execute local pass on them.  We maintain it
 198      per-function in order to allow IPA passes to introduce new functions.  */
 199   VEC(ipa_opt_pass,heap) * GTY((skip)) ipa_transforms_to_apply;
 200
 201   struct cgraph_local_info local;
 202   struct cgraph_global_info global;
 203   struct cgraph_rtl_info rtl;
 204   struct cgraph_clone_info clone;
 205
 206   /* Expected number of executions: calculated in profile.c.  */
 207   gcov_type count;
 208   /* Unique id of the node.  */
 209   int uid;
 210   /* Ordering of all cgraph nodes.  */
 211   int order;
 212
 213   /* unique id for profiling. pid is not suitable because of different
 214      number of cfg nodes with -fprofile-generate and -fprofile-use */
 215   int pid;
 216
 217   /* Set when function must be output for some reason.  The primary
 218      use of this flag is to mark functions needed to be output for
 219      non-standard reason.  Functions that are externally visible
 220      or reachable from functions needed to be output are marked
 221      by specialized flags.  */
 222   unsigned needed : 1;
 223   /* Set when function has address taken.
 224      In current implementation it imply needed flag. */
 225   unsigned address_taken : 1;
 226   /* Set when decl is an abstract function pointed to by the
 227      ABSTRACT_DECL_ORIGIN of a reachable function.  */
 228   unsigned abstract_and_needed : 1;
 229   /* Set when function is reachable by call from other function
 230      that is either reachable or needed.
 231      This flag is computed at original cgraph construction and then
 232      updated in cgraph_remove_unreachable_nodes.  Note that after
 233      cgraph_remove_unreachable_nodes cgraph still can contain unreachable
 234      nodes when they are needed for virtual clone instantiation.  */
 235   unsigned reachable : 1;
 236   /* Set once the function is lowered (i.e. its CFG is built).  */
 237   unsigned lowered : 1;
 238   /* Set once the function has been instantiated and its callee
 239      lists created.  */
 240   unsigned analyzed : 1;
 241   /* Set when function is scheduled to be processed by local passes.  */
 242   unsigned process : 1;
 243   /* Set for aliases once they got through assemble_alias.  */
 244   unsigned alias : 1;
 245   /* Set for nodes that was constructed and finalized by frontend.  */
 246   unsigned finalized_by_frontend : 1;
 247   /* Set for alias nodes, same_body points to the node they are alias of
 248      and they are linked through the next/previous pointers.  */
 249   unsigned same_body_alias : 1;
 250 };
 251
 252 typedef struct cgraph_node *cgraph_node_ptr;
 253
 254 DEF_VEC_P(cgraph_node_ptr);
 255 DEF_VEC_ALLOC_P(cgraph_node_ptr,heap);
 256 DEF_VEC_ALLOC_P(cgraph_node_ptr,gc);
 257
 258 /* A cgraph node set is a collection of cgraph nodes.  A cgraph node
 259    can appear in multiple sets.  */
 260 struct GTY(()) cgraph_node_set_def
 261 {
 262   htab_t GTY((param_is (struct cgraph_node_set_element_def))) hashtab;
 263   VEC(cgraph_node_ptr, gc) *nodes;
 264   PTR GTY ((skip)) aux;
 265 };
 266
 267 typedef struct cgraph_node_set_def *cgraph_node_set;
 268
 269 DEF_VEC_P(cgraph_node_set);
 270 DEF_VEC_ALLOC_P(cgraph_node_set,gc);
 271 DEF_VEC_ALLOC_P(cgraph_node_set,heap);
 272
 273 /* A cgraph node set element contains an index in the vector of nodes in
 274    the set.  */
 275 struct GTY(()) cgraph_node_set_element_def
 276 {
 277   struct cgraph_node *node;
 278   HOST_WIDE_INT index;
 279 };
 280
 281 typedef struct cgraph_node_set_element_def *cgraph_node_set_element;
 282 typedef const struct cgraph_node_set_element_def *const_cgraph_node_set_element;
 283
 284 /* Iterator structure for cgraph node sets.  */
 285 typedef struct
 286 {
 287   cgraph_node_set set;
 288   unsigned index;
 289 } cgraph_node_set_iterator;
 290
 291 #define DEFCIFCODE(code, string)        CIF_ ## code,
 292 /* Reasons for inlining failures.  */
 293 typedef enum {
 294 #include "cif-code.def"
 295   CIF_N_REASONS
 296 } cgraph_inline_failed_t;
 297
 298 struct GTY((chain_next ("%h.next_caller"), chain_prev ("%h.prev_caller"))) cgraph_edge {
 299   struct cgraph_node *caller;
 300   struct cgraph_node *callee;
 301   struct cgraph_edge *prev_caller;
 302   struct cgraph_edge *next_caller;
 303   struct cgraph_edge *prev_callee;
 304   struct cgraph_edge *next_callee;
 305   gimple call_stmt;
 306   /* The stmt_uid of this call stmt.  This is used by LTO to recover
 307      the call_stmt when the function is serialized in.  */
 308   unsigned int lto_stmt_uid;
 309   PTR GTY ((skip (""))) aux;
 310   /* When equal to CIF_OK, inline this call.  Otherwise, points to the
 311      explanation why function was not inlined.  */
 312   cgraph_inline_failed_t inline_failed;
 313   /* Expected number of executions: calculated in profile.c.  */
 314   gcov_type count;
 315   /* Expected frequency of executions within the function.
 316      When set to CGRAPH_FREQ_BASE, the edge is expected to be called once
 317      per function call.  The range is 0 to CGRAPH_FREQ_MAX.  */
 318   int frequency;
 319   /* Depth of loop nest, 1 means no loop nest.  */
 320   unsigned int loop_nest : 30;
 321   /* Whether this edge describes a call that was originally indirect.  */
 322   unsigned int indirect_call : 1;
 323   /* True if the corresponding CALL stmt cannot be inlined.  */
 324   unsigned int call_stmt_cannot_inline_p : 1;
 325   /* Can this call throw externally?  */
 326   unsigned int can_throw_external : 1;
 327   /* Unique id of the edge.  */
 328   int uid;
 329 };
 330
 331 #define CGRAPH_FREQ_BASE 1000
 332 #define CGRAPH_FREQ_MAX 100000
 333
 334 typedef struct cgraph_edge *cgraph_edge_p;
 335
 336 DEF_VEC_P(cgraph_edge_p);
 337 DEF_VEC_ALLOC_P(cgraph_edge_p,heap);
 338
 339 /* The varpool data structure.
 340    Each static variable decl has assigned varpool_node.  */
 341
 342 struct GTY((chain_next ("%h.next"))) varpool_node {
 343   tree decl;
 344   /* Pointer to the next function in varpool_nodes.  */
 345   struct varpool_node *next;
 346   /* Pointer to the next function in varpool_nodes_queue.  */
 347   struct varpool_node *next_needed;
 348   /* Ordering of all cgraph nodes.  */
 349   int order;
 350
 351   /* Set when function must be output - it is externally visible
 352      or its address is taken.  */
 353   unsigned needed : 1;
 354   /* Needed variables might become dead by optimization.  This flag
 355      forces the variable to be output even if it appears dead otherwise.  */
 356   unsigned force_output : 1;
 357   /* Set once the variable has been instantiated and its callee
 358      lists created.  */
 359   unsigned analyzed : 1;
 360   /* Set once it has been finalized so we consider it to be output.  */
 361   unsigned finalized : 1;
 362   /* Set when variable is scheduled to be assembled.  */
 363   unsigned output : 1;
 364   /* Set when function is visible by other units.  */
 365   unsigned externally_visible : 1;
 366   /* Set for aliases once they got through assemble_alias.  */
 367   unsigned alias : 1;
 368 };
 369
 370 /* Every top level asm statement is put into a cgraph_asm_node.  */
 371
 372 struct GTY(()) cgraph_asm_node {
 373   /* Next asm node.  */
 374   struct cgraph_asm_node *next;
 375   /* String for this asm node.  */
 376   tree asm_str;
 377   /* Ordering of all cgraph nodes.  */
 378   int order;
 379 };
 380
 381 extern GTY(()) struct cgraph_node *cgraph_nodes;
 382 extern GTY(()) int cgraph_n_nodes;
 383 extern GTY(()) int cgraph_max_uid;
 384 extern GTY(()) int cgraph_edge_max_uid;
 385 extern GTY(()) int cgraph_max_pid;
 386 extern bool cgraph_global_info_ready;
 387 enum cgraph_state
 388 {
 389   /* Callgraph is being constructed.  It is safe to add new functions.  */
 390   CGRAPH_STATE_CONSTRUCTION,
 391   /* Callgraph is built and IPA passes are being run.  */
 392   CGRAPH_STATE_IPA,
 393   /* Callgraph is built and all functions are transformed to SSA form.  */
 394   CGRAPH_STATE_IPA_SSA,
 395   /* Functions are now ordered and being passed to RTL expanders.  */
 396   CGRAPH_STATE_EXPANSION,
 397   /* All cgraph expansion is done.  */
 398   CGRAPH_STATE_FINISHED
 399 };
 400 extern enum cgraph_state cgraph_state;
 401 extern bool cgraph_function_flags_ready;
 402 extern GTY(()) struct cgraph_node *cgraph_nodes_queue;
 403 extern GTY(()) struct cgraph_node *cgraph_new_nodes;
 404
 405 extern GTY(()) struct cgraph_asm_node *cgraph_asm_nodes;
 406 extern GTY(()) int cgraph_order;
 407
 408 /* In cgraph.c  */
 409 void dump_cgraph (FILE *);
 410 void debug_cgraph (void);
 411 void dump_cgraph_node (FILE *, struct cgraph_node *);
 412 void debug_cgraph_node (struct cgraph_node *);
 413 void cgraph_insert_node_to_hashtable (struct cgraph_node *node);
 414 void cgraph_remove_edge (struct cgraph_edge *);
 415 void cgraph_remove_node (struct cgraph_node *);
 416 void cgraph_remove_node_and_inline_clones (struct cgraph_node *);
 417 void cgraph_release_function_body (struct cgraph_node *);
 418 void cgraph_node_remove_callees (struct cgraph_node *node);
 419 struct cgraph_edge *cgraph_create_edge (struct cgraph_node *,
 420                                         struct cgraph_node *,
 421                                         gimple, gcov_type, int, int);
 422
 423 struct cgraph_node * cgraph_get_node (tree);
 424 struct cgraph_node *cgraph_node (tree);
 425 bool cgraph_same_body_alias (tree, tree);
 426 void cgraph_remove_same_body_alias (struct cgraph_node *);
 427 struct cgraph_node *cgraph_node_for_asm (tree);
 428 struct cgraph_edge *cgraph_edge (struct cgraph_node *, gimple);
 429 void cgraph_set_call_stmt (struct cgraph_edge *, gimple);
 430 void cgraph_set_call_stmt_including_clones (struct cgraph_node *, gimple, gimple);
 431 void cgraph_create_edge_including_clones (struct cgraph_node *,
 432                                           struct cgraph_node *,
 433                                           gimple, gcov_type, int, int,
 434                                           cgraph_inline_failed_t);
 435 void cgraph_update_edges_for_call_stmt (gimple, tree, gimple);
 436 struct cgraph_local_info *cgraph_local_info (tree);
 437 struct cgraph_global_info *cgraph_global_info (tree);
 438 struct cgraph_rtl_info *cgraph_rtl_info (tree);
 439 const char * cgraph_node_name (struct cgraph_node *);
 440 struct cgraph_edge * cgraph_clone_edge (struct cgraph_edge *,
 441                                         struct cgraph_node *, gimple,
 442                                         unsigned, gcov_type, int, int, bool);
 443 struct cgraph_node * cgraph_clone_node (struct cgraph_node *, gcov_type, int,
 444                                         int, bool, VEC(cgraph_edge_p,heap) *);
 445
 446 void cgraph_redirect_edge_callee (struct cgraph_edge *, struct cgraph_node *);
 447
 448 struct cgraph_asm_node *cgraph_add_asm_node (tree);
 449
 450 bool cgraph_function_possibly_inlined_p (tree);
 451 void cgraph_unnest_node (struct cgraph_node *);
 452
 453 enum availability cgraph_function_body_availability (struct cgraph_node *);
 454 void cgraph_add_new_function (tree, bool);
 455 const char* cgraph_inline_failed_string (cgraph_inline_failed_t);
 456 struct cgraph_node * cgraph_create_virtual_clone (struct cgraph_node *old_node,
 457                                                   VEC(cgraph_edge_p,heap)*,
 458                                                   VEC(ipa_replace_map_p,gc)* tree_map,
 459                                                   bitmap args_to_skip);
 460
 461 /* In cgraphunit.c  */
 462 void cgraph_finalize_function (tree, bool);
 463 void cgraph_mark_if_needed (tree);
 464 void cgraph_finalize_compilation_unit (void);
 465 void cgraph_optimize (void);
 466 void cgraph_mark_needed_node (struct cgraph_node *);
 467 void cgraph_mark_address_taken_node (struct cgraph_node *);
 468 void cgraph_mark_reachable_node (struct cgraph_node *);
 469 bool cgraph_inline_p (struct cgraph_edge *, cgraph_inline_failed_t *reason);
 470 bool cgraph_preserve_function_body_p (tree);
 471 void verify_cgraph (void);
 472 void verify_cgraph_node (struct cgraph_node *);
 473 void cgraph_build_static_cdtor (char which, tree body, int priority);
 474 void cgraph_reset_static_var_maps (void);
 475 void init_cgraph (void);
 476 struct cgraph_node *cgraph_function_versioning (struct cgraph_node *,
 477                                                 VEC(cgraph_edge_p,heap)*,
 478                                                 VEC(ipa_replace_map_p,gc)*,
 479                                                 bitmap);
 480 void tree_function_versioning (tree, tree, VEC (ipa_replace_map_p,gc)*, bool, bitmap);
 481 struct cgraph_node *save_inline_function_body (struct cgraph_node *);
 482 void record_references_in_initializer (tree, bool);
 483 bool cgraph_process_new_functions (void);
 484
 485 bool cgraph_decide_is_function_needed (struct cgraph_node *, tree);
 486
 487 typedef void (*cgraph_edge_hook)(struct cgraph_edge *, void *);
 488 typedef void (*cgraph_node_hook)(struct cgraph_node *, void *);
 489 typedef void (*cgraph_2edge_hook)(struct cgraph_edge *, struct cgraph_edge *,
 490                                   void *);
 491 typedef void (*cgraph_2node_hook)(struct cgraph_node *, struct cgraph_node *,
 492                                   void *);
 493 struct cgraph_edge_hook_list;
 494 struct cgraph_node_hook_list;
 495 struct cgraph_2edge_hook_list;
 496 struct cgraph_2node_hook_list;
 497 struct cgraph_edge_hook_list *cgraph_add_edge_removal_hook (cgraph_edge_hook, void *);
 498 void cgraph_remove_edge_removal_hook (struct cgraph_edge_hook_list *);
 499 struct cgraph_node_hook_list *cgraph_add_node_removal_hook (cgraph_node_hook,
 500                                                             void *);
 501 void cgraph_remove_node_removal_hook (struct cgraph_node_hook_list *);
 502 struct cgraph_node_hook_list *cgraph_add_function_insertion_hook (cgraph_node_hook,
 503                                                                   void *);
 504 void cgraph_remove_function_insertion_hook (struct cgraph_node_hook_list *);
 505 void cgraph_call_function_insertion_hooks (struct cgraph_node *node);
 506 struct cgraph_2edge_hook_list *cgraph_add_edge_duplication_hook (cgraph_2edge_hook, void *);
 507 void cgraph_remove_edge_duplication_hook (struct cgraph_2edge_hook_list *);
 508 struct cgraph_2node_hook_list *cgraph_add_node_duplication_hook (cgraph_2node_hook, void *);
 509 void cgraph_remove_node_duplication_hook (struct cgraph_2node_hook_list *);
 510 void cgraph_materialize_all_clones (void);
 511
 512 /* In cgraphbuild.c  */
 513 unsigned int rebuild_cgraph_edges (void);
 514 void reset_inline_failed (struct cgraph_node *);
 515 int compute_call_stmt_bb_frequency (tree, basic_block bb);
 516
 517 /* In ipa.c  */
 518 bool cgraph_remove_unreachable_nodes (bool, FILE *);
 519 int cgraph_postorder (struct cgraph_node **);
 520 cgraph_node_set cgraph_node_set_new (void);
 521 cgraph_node_set_iterator cgraph_node_set_find (cgraph_node_set,
 522                                                struct cgraph_node *);
 523 void cgraph_node_set_add (cgraph_node_set, struct cgraph_node *);
 524 void cgraph_node_set_remove (cgraph_node_set, struct cgraph_node *);
 525 void dump_cgraph_node_set (FILE *, cgraph_node_set);
 526 void debug_cgraph_node_set (cgraph_node_set);
 527
 528
 529 /* In predict.c  */
 530 bool cgraph_maybe_hot_edge_p (struct cgraph_edge *e);
 531
 532 /* In varpool.c  */
 533 extern GTY(()) struct varpool_node *varpool_nodes_queue;
 534 extern GTY(()) struct varpool_node *varpool_nodes;
 535
 536 struct varpool_node *varpool_node (tree);
 537 struct varpool_node *varpool_node_for_asm (tree asmname);
 538 void varpool_mark_needed_node (struct varpool_node *);
 539 void debug_varpool (void);
 540 void dump_varpool (FILE *);
 541 void dump_varpool_node (FILE *, struct varpool_node *);
 542
 543 void varpool_finalize_decl (tree);
 544 bool decide_is_variable_needed (struct varpool_node *, tree);
 545 enum availability cgraph_variable_initializer_availability (struct varpool_node *);
 546 void cgraph_make_node_local (struct cgraph_node *);
 547 bool cgraph_node_can_be_local_p (struct cgraph_node *);
 548
 549 bool varpool_assemble_pending_decls (void);
 550 bool varpool_assemble_decl (struct varpool_node *node);
 551 bool varpool_analyze_pending_decls (void);
 552 void varpool_remove_unreferenced_decls (void);
 553 void varpool_empty_needed_queue (void);
 554 const char * varpool_node_name (struct varpool_node *node);
 555
 556 /* Walk all reachable static variables.  */
 557 #define FOR_EACH_STATIC_VARIABLE(node) \
 558    for ((node) = varpool_nodes_queue; (node); (node) = (node)->next_needed)
 559
 560 /* Return first reachable static variable with initializer.  */
 561 static inline struct varpool_node *
 562 varpool_first_static_initializer (void)
 563 {
 564   struct varpool_node *node;
 565   for (node = varpool_nodes_queue; node; node = node->next_needed)
 566     {
 567       gcc_assert (TREE_CODE (node->decl) == VAR_DECL);
 568       if (DECL_INITIAL (node->decl))
 569         return node;
 570     }
 571   return NULL;
 572 }
 573
 574 /* Return next reachable static variable with initializer after NODE.  */
 575 static inline struct varpool_node *
 576 varpool_next_static_initializer (struct varpool_node *node)
 577 {
 578   for (node = node->next_needed; node; node = node->next_needed)
 579     {
 580       gcc_assert (TREE_CODE (node->decl) == VAR_DECL);
 581       if (DECL_INITIAL (node->decl))
 582         return node;
 583     }
 584   return NULL;
 585 }
 586
 587 /* Walk all static variables with initializer set.  */
 588 #define FOR_EACH_STATIC_INITIALIZER(node) \
 589    for ((node) = varpool_first_static_initializer (); (node); \
 590         (node) = varpool_next_static_initializer (node))
 591
 592 /* In ipa-inline.c  */
 593 void cgraph_clone_inlined_nodes (struct cgraph_edge *, bool, bool);
 594 unsigned int compute_inline_parameters (struct cgraph_node *);
 595
 596
 597 /* Create a new static variable of type TYPE.  */
 598 tree add_new_static_var (tree type);
 599
 600 /* lto-cgraph.c */
 601
 602 enum LTO_cgraph_tags
 603 {
 604   /* Must leave 0 for the stopper.  */
 605   LTO_cgraph_avail_node = 1,
 606   LTO_cgraph_overwritable_node,
 607   LTO_cgraph_unavail_node,
 608   LTO_cgraph_edge,
 609   LTO_cgraph_last_tag
 610 };
 611
 612 extern const char * LTO_cgraph_tag_names[LTO_cgraph_last_tag];
 613
 614 #define LCC_NOT_FOUND   (-1)
 615
 616
 617 /* Return true if iterator CSI points to nothing.  */
 618 static inline bool
 619 csi_end_p (cgraph_node_set_iterator csi)
 620 {
 621   return csi.index >= VEC_length (cgraph_node_ptr, csi.set->nodes);
 622 }
 623
 624 /* Advance iterator CSI.  */
 625 static inline void
 626 csi_next (cgraph_node_set_iterator *csi)
 627 {
 628   csi->index++;
 629 }
 630
 631 /* Return the node pointed to by CSI.  */
 632 static inline struct cgraph_node *
 633 csi_node (cgraph_node_set_iterator csi)
 634 {
 635   return VEC_index (cgraph_node_ptr, csi.set->nodes, csi.index);
 636 }
 637
 638 /* Return an iterator to the first node in SET.  */
 639 static inline cgraph_node_set_iterator
 640 csi_start (cgraph_node_set set)
 641 {
 642   cgraph_node_set_iterator csi;
 643
 644   csi.set = set;
 645   csi.index = 0;
 646   return csi;
 647 }
 648
 649 /* Return true if SET contains NODE.  */
 650 static inline bool
 651 cgraph_node_in_set_p (struct cgraph_node *node, cgraph_node_set set)
 652 {
 653   cgraph_node_set_iterator csi;
 654   csi = cgraph_node_set_find (set, node);
 655   return !csi_end_p (csi);
 656 }
 657
 658 /* Return number of nodes in SET.  */
 659 static inline size_t
 660 cgraph_node_set_size (cgraph_node_set set)
 661 {
 662   return htab_elements (set->hashtab);
 663 }
 664
 665 /* Uniquize all constants that appear in memory.
 666    Each constant in memory thus far output is recorded
 667    in `const_desc_table'.  */
 668
 669 struct GTY(()) constant_descriptor_tree {
 670   /* A MEM for the constant.  */
 671   rtx rtl;
 672
 673   /* The value of the constant.  */
 674   tree value;
 675
 676   /* Hash of value.  Computing the hash from value each time
 677      hashfn is called can't work properly, as that means recursive
 678      use of the hash table during hash table expansion.  */
 679   hashval_t hash;
 680 };
 681
 682 /* Return true when function NODE is only called directly.
 683    i.e. it is not externally visible, address was not taken and
 684    it is not used in any other non-standard way.  */
 685
 686 static inline bool
 687 cgraph_only_called_directly_p (struct cgraph_node *node)
 688 {
 689   return !node->needed && !node->local.externally_visible;
 690 }
 691
 692 /* Return true when function NODE can be removed from callgraph
 693    if all direct calls are eliminated.  */
 694
 695 static inline bool
 696 cgraph_can_remove_if_no_direct_calls_p (struct cgraph_node *node)
 697 {
 698   return (!node->needed
 699           && (DECL_COMDAT (node->decl) || !node->local.externally_visible));
 700 }
 701
 702 /* Constant pool accessor function.  */
 703 htab_t constant_pool_htab (void);
 704
 705 #endif  /* GCC_CGRAPH_H  */