gcc/cgraph.h

   1 /* Callgraph handling code.
   2    Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008
   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 extern const char * const cgraph_availability_names[];
  50
  51 /* Information about the function collected locally.
  52    Available after function is analyzed.  */
  53
  54 struct cgraph_local_info GTY(())
  55 {
  56   struct inline_summary {
  57     /* Estimated stack frame consumption by the function.  */
  58     HOST_WIDE_INT estimated_self_stack_size;
  59
  60     /* Size of the function before inlining.  */
  61     int self_insns;
  62   } inline_summary;
  63
  64   /* Set when function function is visible in current compilation unit only
  65      and its address is never taken.  */
  66   unsigned local : 1;
  67
  68   /* Set when function is visible by other units.  */
  69   unsigned externally_visible : 1;
  70
  71   /* Set once it has been finalized so we consider it to be output.  */
  72   unsigned finalized : 1;
  73
  74   /* False when there something makes inlining impossible (such as va_arg).  */
  75   unsigned inlinable : 1;
  76
  77   /* True when function should be inlined independently on its size.  */
  78   unsigned disregard_inline_limits : 1;
  79
  80   /* True when the function has been originally extern inline, but it is
  81      redefined now.  */
  82   unsigned redefined_extern_inline : 1;
  83
  84   /* True if statics_read_for_function and
  85      statics_written_for_function contain valid data.  */
  86   unsigned for_functions_valid : 1;
  87
  88   /* True if the function is going to be emitted in some other translation
  89      unit, referenced from vtable.  */
  90   unsigned vtable_method : 1;
  91 };
  92
  93 /* Information about the function that needs to be computed globally
  94    once compilation is finished.  Available only with -funit-at-a-time.  */
  95
  96 struct cgraph_global_info GTY(())
  97 {
  98   /* Estimated stack frame consumption by the function.  */
  99   HOST_WIDE_INT estimated_stack_size;
 100   /* Expected offset of the stack frame of inlined function.  */
 101   HOST_WIDE_INT stack_frame_offset;
 102
 103   /* For inline clones this points to the function they will be
 104      inlined into.  */
 105   struct cgraph_node *inlined_to;
 106
 107   /* Estimated size of the function after inlining.  */
 108   int insns;
 109
 110   /* Estimated growth after inlining.  INT_MIN if not computed.  */
 111   int estimated_growth;
 112
 113   /* Set iff the function has been inlined at least once.  */
 114   bool inlined;
 115 };
 116
 117 /* Information about the function that is propagated by the RTL backend.
 118    Available only for functions that has been already assembled.  */
 119
 120 struct cgraph_rtl_info GTY(())
 121 {
 122    unsigned int preferred_incoming_stack_boundary;
 123 };
 124
 125 /* The cgraph data structure.
 126    Each function decl has assigned cgraph_node listing callees and callers.  */
 127
 128 struct cgraph_node GTY((chain_next ("%h.next"), chain_prev ("%h.previous")))
 129 {
 130   tree decl;
 131   struct cgraph_edge *callees;
 132   struct cgraph_edge *callers;
 133   struct cgraph_node *next;
 134   struct cgraph_node *previous;
 135   /* For nested functions points to function the node is nested in.  */
 136   struct cgraph_node *origin;
 137   /* Points to first nested function, if any.  */
 138   struct cgraph_node *nested;
 139   /* Pointer to the next function with same origin, if any.  */
 140   struct cgraph_node *next_nested;
 141   /* Pointer to the next function in cgraph_nodes_queue.  */
 142   struct cgraph_node *next_needed;
 143   /* Pointer to the next clone.  */
 144   struct cgraph_node *next_clone;
 145   struct cgraph_node *prev_clone;
 146   /* For functions with many calls sites it holds map from call expression
 147      to the edge to speed up cgraph_edge function.  */
 148   htab_t GTY((param_is (struct cgraph_edge))) call_site_hash;
 149
 150   PTR GTY ((skip)) aux;
 151
 152   struct cgraph_local_info local;
 153   struct cgraph_global_info global;
 154   struct cgraph_rtl_info rtl;
 155
 156   /* Expected number of executions: calculated in profile.c.  */
 157   gcov_type count;
 158   /* Unique id of the node.  */
 159   int uid;
 160   /* Ordering of all cgraph nodes.  */
 161   int order;
 162
 163   /* unique id for profiling. pid is not suitable because of different
 164      number of cfg nodes with -fprofile-generate and -fprofile-use */
 165   int pid;
 166
 167   /* Set when function must be output - it is externally visible
 168      or its address is taken.  */
 169   unsigned needed : 1;
 170   /* Set when decl is an abstract function pointed to by the
 171      ABSTRACT_DECL_ORIGIN of a reachable function.  */
 172   unsigned abstract_and_needed : 1;
 173   /* Set when function is reachable by call from other function
 174      that is either reachable or needed.  */
 175   unsigned reachable : 1;
 176   /* Set once the function is lowered (i.e. its CFG is built).  */
 177   unsigned lowered : 1;
 178   /* Set once the function has been instantiated and its callee
 179      lists created.  */
 180   unsigned analyzed : 1;
 181   /* Set when function is scheduled to be processed by local passes.  */
 182   unsigned process : 1;
 183   /* Set for aliases once they got through assemble_alias.  */
 184   unsigned alias : 1;
 185
 186   /* In non-unit-at-a-time mode the function body of inline candidates is saved
 187      into clone before compiling so the function in original form can be
 188      inlined later.  This pointer points to the clone.  */
 189   tree inline_decl;
 190 };
 191
 192 #define DEFCIFCODE(code, string)        CIF_ ## code,
 193 /* Reasons for inlining failures.  */
 194 typedef enum {
 195 #include "cif-code.def"
 196   CIF_N_REASONS
 197 } cgraph_inline_failed_t;
 198
 199 struct cgraph_edge GTY((chain_next ("%h.next_caller"), chain_prev ("%h.prev_caller")))
 200 {
 201   struct cgraph_node *caller;
 202   struct cgraph_node *callee;
 203   struct cgraph_edge *prev_caller;
 204   struct cgraph_edge *next_caller;
 205   struct cgraph_edge *prev_callee;
 206   struct cgraph_edge *next_callee;
 207   gimple call_stmt;
 208   PTR GTY ((skip (""))) aux;
 209   /* When equal to CIF_OK, inline this call.  Otherwise, points to the
 210      explanation why function was not inlined.  */
 211   cgraph_inline_failed_t inline_failed;
 212   /* Expected number of executions: calculated in profile.c.  */
 213   gcov_type count;
 214   /* Expected frequency of executions within the function.
 215      When set to CGRAPH_FREQ_BASE, the edge is expected to be called once
 216      per function call.  The range is 0 to CGRAPH_FREQ_MAX.  */
 217   int frequency;
 218   /* Depth of loop nest, 1 means no loop nest.  */
 219   unsigned int loop_nest : 30;
 220   /* Whether this edge describes a call that was originally indirect.  */
 221   unsigned int indirect_call : 1;
 222   /* Can this call throw externally?  */
 223   unsigned int can_throw_external : 1;
 224   /* Unique id of the edge.  */
 225   int uid;
 226 };
 227
 228 #define CGRAPH_FREQ_BASE 1000
 229 #define CGRAPH_FREQ_MAX 100000
 230
 231 typedef struct cgraph_edge *cgraph_edge_p;
 232
 233 DEF_VEC_P(cgraph_edge_p);
 234 DEF_VEC_ALLOC_P(cgraph_edge_p,heap);
 235
 236 /* The varpool data structure.
 237    Each static variable decl has assigned varpool_node.  */
 238
 239 struct varpool_node GTY((chain_next ("%h.next")))
 240 {
 241   tree decl;
 242   /* Pointer to the next function in varpool_nodes.  */
 243   struct varpool_node *next;
 244   /* Pointer to the next function in varpool_nodes_queue.  */
 245   struct varpool_node *next_needed;
 246   /* Ordering of all cgraph nodes.  */
 247   int order;
 248
 249   /* Set when function must be output - it is externally visible
 250      or its address is taken.  */
 251   unsigned needed : 1;
 252   /* Needed variables might become dead by optimization.  This flag
 253      forces the variable to be output even if it appears dead otherwise.  */
 254   unsigned force_output : 1;
 255   /* Set once the variable has been instantiated and its callee
 256      lists created.  */
 257   unsigned analyzed : 1;
 258   /* Set once it has been finalized so we consider it to be output.  */
 259   unsigned finalized : 1;
 260   /* Set when variable is scheduled to be assembled.  */
 261   unsigned output : 1;
 262   /* Set when function is visible by other units.  */
 263   unsigned externally_visible : 1;
 264   /* Set for aliases once they got through assemble_alias.  */
 265   unsigned alias : 1;
 266 };
 267
 268 /* Every top level asm statement is put into a cgraph_asm_node.  */
 269
 270 struct cgraph_asm_node GTY(())
 271 {
 272   /* Next asm node.  */
 273   struct cgraph_asm_node *next;
 274   /* String for this asm node.  */
 275   tree asm_str;
 276   /* Ordering of all cgraph nodes.  */
 277   int order;
 278 };
 279
 280 extern GTY(()) struct cgraph_node *cgraph_nodes;
 281 extern GTY(()) int cgraph_n_nodes;
 282 extern GTY(()) int cgraph_max_uid;
 283 extern GTY(()) int cgraph_edge_max_uid;
 284 extern GTY(()) int cgraph_max_pid;
 285 extern bool cgraph_global_info_ready;
 286 enum cgraph_state
 287 {
 288   /* Callgraph is being constructed.  It is safe to add new functions.  */
 289   CGRAPH_STATE_CONSTRUCTION,
 290   /* Callgraph is built and IPA passes are being run.  */
 291   CGRAPH_STATE_IPA,
 292   /* Callgraph is built and all functions are transformed to SSA form.  */
 293   CGRAPH_STATE_IPA_SSA,
 294   /* Functions are now ordered and being passed to RTL expanders.  */
 295   CGRAPH_STATE_EXPANSION,
 296   /* All cgraph expansion is done.  */
 297   CGRAPH_STATE_FINISHED
 298 };
 299 extern enum cgraph_state cgraph_state;
 300 extern bool cgraph_function_flags_ready;
 301 extern GTY(()) struct cgraph_node *cgraph_nodes_queue;
 302 extern GTY(()) struct cgraph_node *cgraph_new_nodes;
 303
 304 extern GTY(()) struct cgraph_asm_node *cgraph_asm_nodes;
 305 extern GTY(()) int cgraph_order;
 306
 307 /* In cgraph.c  */
 308 void dump_cgraph (FILE *);
 309 void debug_cgraph (void);
 310 void dump_cgraph_node (FILE *, struct cgraph_node *);
 311 void debug_cgraph_node (struct cgraph_node *);
 312 void cgraph_insert_node_to_hashtable (struct cgraph_node *node);
 313 void cgraph_remove_edge (struct cgraph_edge *);
 314 void cgraph_remove_node (struct cgraph_node *);
 315 void cgraph_release_function_body (struct cgraph_node *);
 316 void cgraph_node_remove_callees (struct cgraph_node *node);
 317 struct cgraph_edge *cgraph_create_edge (struct cgraph_node *,
 318                                         struct cgraph_node *,
 319                                         gimple, gcov_type, int, int);
 320 struct cgraph_node *cgraph_node (tree);
 321 struct cgraph_node *cgraph_node_for_asm (tree asmname);
 322 struct cgraph_edge *cgraph_edge (struct cgraph_node *, gimple);
 323 void cgraph_set_call_stmt (struct cgraph_edge *, gimple);
 324 void cgraph_update_edges_for_call_stmt (gimple, gimple);
 325 struct cgraph_local_info *cgraph_local_info (tree);
 326 struct cgraph_global_info *cgraph_global_info (tree);
 327 struct cgraph_rtl_info *cgraph_rtl_info (tree);
 328 const char * cgraph_node_name (struct cgraph_node *);
 329 struct cgraph_edge * cgraph_clone_edge (struct cgraph_edge *,
 330                                         struct cgraph_node *,
 331                                         gimple, gcov_type, int, int, bool);
 332 struct cgraph_node * cgraph_clone_node (struct cgraph_node *, gcov_type, int,
 333                                         int, bool);
 334
 335 void cgraph_redirect_edge_callee (struct cgraph_edge *, struct cgraph_node *);
 336
 337 struct cgraph_asm_node *cgraph_add_asm_node (tree);
 338
 339 bool cgraph_function_possibly_inlined_p (tree);
 340 void cgraph_unnest_node (struct cgraph_node *);
 341
 342 enum availability cgraph_function_body_availability (struct cgraph_node *);
 343 void cgraph_add_new_function (tree, bool);
 344 const char* cgraph_inline_failed_string (cgraph_inline_failed_t);
 345
 346 /* In cgraphunit.c  */
 347 void cgraph_finalize_function (tree, bool);
 348 void cgraph_mark_if_needed (tree);
 349 void cgraph_finalize_compilation_unit (void);
 350 void cgraph_optimize (void);
 351 void cgraph_mark_needed_node (struct cgraph_node *);
 352 void cgraph_mark_reachable_node (struct cgraph_node *);
 353 bool cgraph_inline_p (struct cgraph_edge *, cgraph_inline_failed_t *reason);
 354 bool cgraph_preserve_function_body_p (tree);
 355 void verify_cgraph (void);
 356 void verify_cgraph_node (struct cgraph_node *);
 357 void cgraph_build_static_cdtor (char which, tree body, int priority);
 358 void cgraph_reset_static_var_maps (void);
 359 void init_cgraph (void);
 360 struct cgraph_node *cgraph_function_versioning (struct cgraph_node *,
 361                                                 VEC(cgraph_edge_p,heap)*,
 362                                                 varray_type,
 363                                                 bitmap);
 364 void cgraph_analyze_function (struct cgraph_node *);
 365 struct cgraph_node *save_inline_function_body (struct cgraph_node *);
 366 void record_references_in_initializer (tree);
 367 bool cgraph_process_new_functions (void);
 368
 369 typedef void (*cgraph_edge_hook)(struct cgraph_edge *, void *);
 370 typedef void (*cgraph_node_hook)(struct cgraph_node *, void *);
 371 typedef void (*cgraph_2edge_hook)(struct cgraph_edge *, struct cgraph_edge *,
 372                                   void *);
 373 typedef void (*cgraph_2node_hook)(struct cgraph_node *, struct cgraph_node *,
 374                                   void *);
 375 struct cgraph_edge_hook_list;
 376 struct cgraph_node_hook_list;
 377 struct cgraph_2edge_hook_list;
 378 struct cgraph_2node_hook_list;
 379 struct cgraph_edge_hook_list *cgraph_add_edge_removal_hook (cgraph_edge_hook, void *);
 380 void cgraph_remove_edge_removal_hook (struct cgraph_edge_hook_list *);
 381 struct cgraph_node_hook_list *cgraph_add_node_removal_hook (cgraph_node_hook,
 382                                                             void *);
 383 void cgraph_remove_node_removal_hook (struct cgraph_node_hook_list *);
 384 struct cgraph_node_hook_list *cgraph_add_function_insertion_hook (cgraph_node_hook,
 385                                                                   void *);
 386 void cgraph_remove_function_insertion_hook (struct cgraph_node_hook_list *);
 387 void cgraph_call_function_insertion_hooks (struct cgraph_node *node);
 388 struct cgraph_2edge_hook_list *cgraph_add_edge_duplication_hook (cgraph_2edge_hook, void *);
 389 void cgraph_remove_edge_duplication_hook (struct cgraph_2edge_hook_list *);
 390 struct cgraph_2node_hook_list *cgraph_add_node_duplication_hook (cgraph_2node_hook, void *);
 391 void cgraph_remove_node_duplication_hook (struct cgraph_2node_hook_list *);
 392
 393 /* In cgraphbuild.c  */
 394 unsigned int rebuild_cgraph_edges (void);
 395 int compute_call_stmt_bb_frequency (basic_block bb);
 396
 397 /* In ipa.c  */
 398 bool cgraph_remove_unreachable_nodes (bool, FILE *);
 399 int cgraph_postorder (struct cgraph_node **);
 400
 401 bool cgraph_maybe_hot_edge_p (struct cgraph_edge *e);
 402
 403 /* In varpool.c  */
 404
 405 extern GTY(()) struct varpool_node *varpool_nodes_queue;
 406 extern GTY(()) struct varpool_node *varpool_nodes;
 407
 408 struct varpool_node *varpool_node (tree);
 409 struct varpool_node *varpool_node_for_asm (tree asmname);
 410 void varpool_mark_needed_node (struct varpool_node *);
 411 void debug_varpool (void);
 412 void dump_varpool (FILE *);
 413 void dump_varpool_node (FILE *, struct varpool_node *);
 414
 415 void varpool_finalize_decl (tree);
 416 bool decide_is_variable_needed (struct varpool_node *, tree);
 417 enum availability cgraph_variable_initializer_availability (struct varpool_node *);
 418
 419 bool varpool_assemble_pending_decls (void);
 420 bool varpool_assemble_decl (struct varpool_node *node);
 421 bool varpool_analyze_pending_decls (void);
 422 void varpool_remove_unreferenced_decls (void);
 423 void varpool_empty_needed_queue (void);
 424
 425 /* Walk all reachable static variables.  */
 426 #define FOR_EACH_STATIC_VARIABLE(node) \
 427    for ((node) = varpool_nodes_queue; (node); (node) = (node)->next_needed)
 428
 429 /* Return first reachable static variable with initializer.  */
 430 static inline struct varpool_node *
 431 varpool_first_static_initializer (void)
 432 {
 433   struct varpool_node *node;
 434   for (node = varpool_nodes_queue; node; node = node->next_needed)
 435     {
 436       gcc_assert (TREE_CODE (node->decl) == VAR_DECL);
 437       if (DECL_INITIAL (node->decl))
 438         return node;
 439     }
 440   return NULL;
 441 }
 442
 443 /* Return next reachable static variable with initializer after NODE.  */
 444 static inline struct varpool_node *
 445 varpool_next_static_initializer (struct varpool_node *node)
 446 {
 447   for (node = node->next_needed; node; node = node->next_needed)
 448     {
 449       gcc_assert (TREE_CODE (node->decl) == VAR_DECL);
 450       if (DECL_INITIAL (node->decl))
 451         return node;
 452     }
 453   return NULL;
 454 }
 455
 456 /* Walk all static variables with initializer set.  */
 457 #define FOR_EACH_STATIC_INITIALIZER(node) \
 458    for ((node) = varpool_first_static_initializer (); (node); \
 459         (node) = varpool_next_static_initializer (node))
 460
 461 /* In ipa-inline.c  */
 462 void cgraph_clone_inlined_nodes (struct cgraph_edge *, bool, bool);
 463 unsigned int compute_inline_parameters (struct cgraph_node *);
 464
 465
 466 /* Create a new static variable of type TYPE.  */
 467 tree add_new_static_var (tree type);
 468
 469 #endif  /* GCC_CGRAPH_H  */