gcc/basic-block.h

   1 /* Define control and data flow tables, and regsets.
   2    Copyright (C) 1987, 1997, 1998, 1999, 2000, 2001, 2002, 2003
   3    Free Software Foundation, Inc.
   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 2, 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 COPYING.  If not, write to the Free
  19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  20 02111-1307, USA.  */
  21
  22 #ifndef GCC_BASIC_BLOCK_H
  23 #define GCC_BASIC_BLOCK_H
  24
  25 #include "bitmap.h"
  26 #include "sbitmap.h"
  27 #include "varray.h"
  28 #include "partition.h"
  29 #include "hard-reg-set.h"
  30
  31 /* Head of register set linked list.  */
  32 typedef bitmap_head regset_head;
  33 /* A pointer to a regset_head.  */
  34 typedef bitmap regset;
  35
  36 /* Initialize a new regset.  */
  37 #define INIT_REG_SET(HEAD) bitmap_initialize (HEAD, 1)
  38
  39 /* Clear a register set by freeing up the linked list.  */
  40 #define CLEAR_REG_SET(HEAD) bitmap_clear (HEAD)
  41
  42 /* Copy a register set to another register set.  */
  43 #define COPY_REG_SET(TO, FROM) bitmap_copy (TO, FROM)
  44
  45 /* Compare two register sets.  */
  46 #define REG_SET_EQUAL_P(A, B) bitmap_equal_p (A, B)
  47
  48 /* `and' a register set with a second register set.  */
  49 #define AND_REG_SET(TO, FROM) bitmap_operation (TO, TO, FROM, BITMAP_AND)
  50
  51 /* `and' the complement of a register set with a register set.  */
  52 #define AND_COMPL_REG_SET(TO, FROM) \
  53   bitmap_operation (TO, TO, FROM, BITMAP_AND_COMPL)
  54
  55 /* Inclusive or a register set with a second register set.  */
  56 #define IOR_REG_SET(TO, FROM) bitmap_operation (TO, TO, FROM, BITMAP_IOR)
  57
  58 /* Exclusive or a register set with a second register set.  */
  59 #define XOR_REG_SET(TO, FROM) bitmap_operation (TO, TO, FROM, BITMAP_XOR)
  60
  61 /* Or into TO the register set FROM1 `and'ed with the complement of FROM2.  */
  62 #define IOR_AND_COMPL_REG_SET(TO, FROM1, FROM2) \
  63   bitmap_ior_and_compl (TO, FROM1, FROM2)
  64
  65 /* Clear a single register in a register set.  */
  66 #define CLEAR_REGNO_REG_SET(HEAD, REG) bitmap_clear_bit (HEAD, REG)
  67
  68 /* Set a single register in a register set.  */
  69 #define SET_REGNO_REG_SET(HEAD, REG) bitmap_set_bit (HEAD, REG)
  70
  71 /* Return true if a register is set in a register set.  */
  72 #define REGNO_REG_SET_P(TO, REG) bitmap_bit_p (TO, REG)
  73
  74 /* Copy the hard registers in a register set to the hard register set.  */
  75 extern void reg_set_to_hard_reg_set (HARD_REG_SET *, bitmap);
  76 #define REG_SET_TO_HARD_REG_SET(TO, FROM)                               \
  77 do {                                                                    \
  78   CLEAR_HARD_REG_SET (TO);                                              \
  79   reg_set_to_hard_reg_set (&TO, FROM);                                  \
  80 } while (0)
  81
  82 /* Loop over all registers in REGSET, starting with MIN, setting REGNUM to the
  83    register number and executing CODE for all registers that are set.  */
  84 #define EXECUTE_IF_SET_IN_REG_SET(REGSET, MIN, REGNUM, CODE)            \
  85   EXECUTE_IF_SET_IN_BITMAP (REGSET, MIN, REGNUM, CODE)
  86
  87 /* Loop over all registers in REGSET1 and REGSET2, starting with MIN, setting
  88    REGNUM to the register number and executing CODE for all registers that are
  89    set in the first regset and not set in the second.  */
  90 #define EXECUTE_IF_AND_COMPL_IN_REG_SET(REGSET1, REGSET2, MIN, REGNUM, CODE) \
  91   EXECUTE_IF_AND_COMPL_IN_BITMAP (REGSET1, REGSET2, MIN, REGNUM, CODE)
  92
  93 /* Loop over all registers in REGSET1 and REGSET2, starting with MIN, setting
  94    REGNUM to the register number and executing CODE for all registers that are
  95    set in both regsets.  */
  96 #define EXECUTE_IF_AND_IN_REG_SET(REGSET1, REGSET2, MIN, REGNUM, CODE) \
  97   EXECUTE_IF_AND_IN_BITMAP (REGSET1, REGSET2, MIN, REGNUM, CODE)
  98
  99 /* Allocate a register set with oballoc.  */
 100 #define OBSTACK_ALLOC_REG_SET(OBSTACK) BITMAP_OBSTACK_ALLOC (OBSTACK)
 101
 102 /* Initialize a register set.  Returns the new register set.  */
 103 #define INITIALIZE_REG_SET(HEAD) bitmap_initialize (&HEAD, 1)
 104
 105 /* Do any cleanup needed on a regset when it is no longer used.  */
 106 #define FREE_REG_SET(REGSET) BITMAP_FREE(REGSET)
 107
 108 /* Do any one-time initializations needed for regsets.  */
 109 #define INIT_ONCE_REG_SET() BITMAP_INIT_ONCE ()
 110
 111 /* Grow any tables needed when the number of registers is calculated
 112    or extended.  For the linked list allocation, nothing needs to
 113    be done, other than zero the statistics on the first allocation.  */
 114 #define MAX_REGNO_REG_SET(NUM_REGS, NEW_P, RENUMBER_P)
 115
 116 /* Type we use to hold basic block counters.  Should be at least
 117    64bit.  Although a counter cannot be negative, we use a signed
 118    type, because erroneous negative counts can be generated when the
 119    flow graph is manipulated by various optimizations.  A signed type
 120    makes those easy to detect.  */
 121 typedef HOST_WIDEST_INT gcov_type;
 122
 123 /* Control flow edge information.  */
 124 typedef struct edge_def {
 125   /* Links through the predecessor and successor lists.  */
 126   struct edge_def *pred_next, *succ_next;
 127
 128   /* The two blocks at the ends of the edge.  */
 129   struct basic_block_def *src, *dest;
 130
 131   /* Instructions queued on the edge.  */
 132   rtx insns;
 133
 134   /* Auxiliary info specific to a pass.  */
 135   void *aux;
 136
 137   int flags;                    /* see EDGE_* below  */
 138   int probability;              /* biased by REG_BR_PROB_BASE */
 139   gcov_type count;              /* Expected number of executions calculated
 140                                    in profile.c  */
 141 } *edge;
 142
 143 #define EDGE_FALLTHRU           1       /* 'Straight line' flow */
 144 #define EDGE_ABNORMAL           2       /* Strange flow, like computed
 145                                            label, or eh */
 146 #define EDGE_ABNORMAL_CALL      4       /* Call with abnormal exit
 147                                            like an exception, or sibcall */
 148 #define EDGE_EH                 8       /* Exception throw */
 149 #define EDGE_FAKE               16      /* Not a real edge (profile.c) */
 150 #define EDGE_DFS_BACK           32      /* A backwards edge */
 151 #define EDGE_CAN_FALLTHRU       64      /* Candidate for straight line
 152                                            flow.  */
 153 #define EDGE_IRREDUCIBLE_LOOP   128     /* Part of irreducible loop.  */
 154 #define EDGE_SIBCALL            256     /* Edge from sibcall to exit.  */
 155 #define EDGE_LOOP_EXIT          512     /* Exit of a loop.  */
 156 #define EDGE_ALL_FLAGS          1023
 157
 158 #define EDGE_COMPLEX    (EDGE_ABNORMAL | EDGE_ABNORMAL_CALL | EDGE_EH)
 159
 160 /* Counter summary from the last set of coverage counts read by
 161    profile.c.  */
 162 extern const struct gcov_ctr_summary *profile_info;
 163
 164 /* Declared in cfgloop.h.  */
 165 struct loop;
 166 struct loops;
 167
 168 /* A basic block is a sequence of instructions with only entry and
 169    only one exit.  If any one of the instructions are executed, they
 170    will all be executed, and in sequence from first to last.
 171
 172    There may be COND_EXEC instructions in the basic block.  The
 173    COND_EXEC *instructions* will be executed -- but if the condition
 174    is false the conditionally executed *expressions* will of course
 175    not be executed.  We don't consider the conditionally executed
 176    expression (which might have side-effects) to be in a separate
 177    basic block because the program counter will always be at the same
 178    location after the COND_EXEC instruction, regardless of whether the
 179    condition is true or not.
 180
 181    Basic blocks need not start with a label nor end with a jump insn.
 182    For example, a previous basic block may just "conditionally fall"
 183    into the succeeding basic block, and the last basic block need not
 184    end with a jump insn.  Block 0 is a descendant of the entry block.
 185
 186    A basic block beginning with two labels cannot have notes between
 187    the labels.
 188
 189    Data for jump tables are stored in jump_insns that occur in no
 190    basic block even though these insns can follow or precede insns in
 191    basic blocks.  */
 192
 193 /* Basic block information indexed by block number.  */
 194 typedef struct basic_block_def {
 195   /* The first and last insns of the block.  */
 196   rtx head, end;
 197
 198   /* The first and last trees of the block.  */
 199   tree head_tree;
 200   tree end_tree;
 201
 202   /* The edges into and out of the block.  */
 203   edge pred, succ;
 204
 205   /* Liveness info.  */
 206
 207   /* The registers that are modified within this in block.  */
 208   regset local_set;
 209   /* The registers that are conditionally modified within this block.
 210      In other words, registers that are set only as part of a
 211      COND_EXEC.  */
 212   regset cond_local_set;
 213   /* The registers that are live on entry to this block.
 214
 215      Note that in SSA form, global_live_at_start does not reflect the
 216      use of regs in phi functions, since the liveness of these regs
 217      may depend on which edge was taken into the block.  */
 218   regset global_live_at_start;
 219   /* The registers that are live on exit from this block.  */
 220   regset global_live_at_end;
 221
 222   /* Auxiliary info specific to a pass.  */
 223   void *aux;
 224
 225   /* The index of this block.  */
 226   int index;
 227
 228   /* Previous and next blocks in the chain.  */
 229   struct basic_block_def *prev_bb, *next_bb;
 230
 231   /* The loop depth of this block.  */
 232   int loop_depth;
 233
 234   /* Outermost loop containing the block.  */
 235   struct loop *loop_father;
 236
 237   /* Expected number of executions: calculated in profile.c.  */
 238   gcov_type count;
 239
 240   /* Expected frequency.  Normalized to be in range 0 to BB_FREQ_MAX.  */
 241   int frequency;
 242
 243   /* Various flags.  See BB_* below.  */
 244   int flags;
 245
 246   /* Additional data maintained by cfg_layout routines.  */
 247   struct reorder_block_def *rbi;
 248 } *basic_block;
 249
 250 #define BB_FREQ_MAX 10000
 251
 252 /* Masks for basic_block.flags.  */
 253 #define BB_DIRTY                1
 254 #define BB_NEW                  2
 255 #define BB_REACHABLE            4
 256 #define BB_VISITED              8
 257 #define BB_IRREDUCIBLE_LOOP     16
 258 #define BB_SUPERBLOCK           32
 259
 260 /* Number of basic blocks in the current function.  */
 261
 262 extern int n_basic_blocks;
 263
 264 /* First free basic block number.  */
 265
 266 extern int last_basic_block;
 267
 268 /* Number of edges in the current function.  */
 269
 270 extern int n_edges;
 271
 272 /* Index by basic block number, get basic block struct info.  */
 273
 274 extern varray_type basic_block_info;
 275
 276 #define BASIC_BLOCK(N)  (VARRAY_BB (basic_block_info, (N)))
 277
 278 /* For iterating over basic blocks.  */
 279 #define FOR_BB_BETWEEN(BB, FROM, TO, DIR) \
 280   for (BB = FROM; BB != TO; BB = BB->DIR)
 281
 282 #define FOR_EACH_BB(BB) \
 283   FOR_BB_BETWEEN (BB, ENTRY_BLOCK_PTR->next_bb, EXIT_BLOCK_PTR, next_bb)
 284
 285 #define FOR_EACH_BB_REVERSE(BB) \
 286   FOR_BB_BETWEEN (BB, EXIT_BLOCK_PTR->prev_bb, ENTRY_BLOCK_PTR, prev_bb)
 287
 288 /* Cycles through _all_ basic blocks, even the fake ones (entry and
 289    exit block).  */
 290
 291 #define FOR_ALL_BB(BB) \
 292   for (BB = ENTRY_BLOCK_PTR; BB; BB = BB->next_bb)
 293
 294 /* What registers are live at the setjmp call.  */
 295
 296 extern regset regs_live_at_setjmp;
 297
 298 /* Special labels found during CFG build.  */
 299
 300 extern GTY(()) rtx label_value_list;
 301 extern GTY(()) rtx tail_recursion_label_list;
 302
 303 extern struct obstack flow_obstack;
 304
 305 /* Indexed by n, gives number of basic block that  (REG n) is used in.
 306    If the value is REG_BLOCK_GLOBAL (-2),
 307    it means (REG n) is used in more than one basic block.
 308    REG_BLOCK_UNKNOWN (-1) means it hasn't been seen yet so we don't know.
 309    This information remains valid for the rest of the compilation
 310    of the current function; it is used to control register allocation.  */
 311
 312 #define REG_BLOCK_UNKNOWN -1
 313 #define REG_BLOCK_GLOBAL -2
 314
 315 #define REG_BASIC_BLOCK(N) (VARRAY_REG (reg_n_info, N)->basic_block)
 316 \f
 317 /* Stuff for recording basic block info.  */
 318
 319 #define BLOCK_HEAD(B)      (BASIC_BLOCK (B)->head)
 320 #define BLOCK_END(B)       (BASIC_BLOCK (B)->end)
 321
 322 #define BLOCK_HEAD_TREE(B) (BASIC_BLOCK (B)->head_tree)
 323 #define BLOCK_END_TREE(B) (BASIC_BLOCK (B)->end_tree)
 324
 325 /* Special block numbers [markers] for entry and exit.  */
 326 #define ENTRY_BLOCK (-1)
 327 #define EXIT_BLOCK (-2)
 328
 329 /* Special block number not valid for any block.  */
 330 #define INVALID_BLOCK (-3)
 331
 332 /* Similarly, block pointers for the edge list.  */
 333 extern struct basic_block_def entry_exit_blocks[2];
 334 #define ENTRY_BLOCK_PTR (&entry_exit_blocks[0])
 335 #define EXIT_BLOCK_PTR  (&entry_exit_blocks[1])
 336
 337 #define BLOCK_NUM(INSN)       (BLOCK_FOR_INSN (INSN)->index + 0)
 338 #define set_block_for_insn(INSN, BB)  (BLOCK_FOR_INSN (INSN) = BB)
 339
 340 extern void compute_bb_for_insn (void);
 341 extern void free_bb_for_insn (void);
 342 extern void update_bb_for_insn (basic_block);
 343
 344 extern void free_basic_block_vars (int);
 345
 346 extern void insert_insn_on_edge (rtx, edge);
 347 bool safe_insert_insn_on_edge (rtx, edge);
 348
 349 extern void commit_edge_insertions (void);
 350 extern void commit_edge_insertions_watch_calls (void);
 351
 352 extern void remove_fake_edges (void);
 353 extern void add_noreturn_fake_exit_edges (void);
 354 extern void connect_infinite_loops_to_exit (void);
 355 extern int flow_call_edges_add (sbitmap);
 356 extern edge unchecked_make_edge (basic_block, basic_block, int);
 357 extern edge cached_make_edge (sbitmap *, basic_block, basic_block, int);
 358 extern edge make_edge (basic_block, basic_block, int);
 359 extern edge make_single_succ_edge (basic_block, basic_block, int);
 360 extern void remove_edge (edge);
 361 extern void redirect_edge_succ (edge, basic_block);
 362 extern edge redirect_edge_succ_nodup (edge, basic_block);
 363 extern void redirect_edge_pred (edge, basic_block);
 364 extern basic_block create_basic_block_structure (rtx, rtx, rtx, basic_block);
 365 extern void clear_bb_flags (void);
 366 extern void tidy_fallthru_edge (edge, basic_block, basic_block);
 367 extern void tidy_fallthru_edges (void);
 368 extern void flow_reverse_top_sort_order_compute (int *);
 369 extern int flow_depth_first_order_compute (int *, int *);
 370 extern void flow_preorder_transversal_compute (int *);
 371 extern int dfs_enumerate_from (basic_block, int,
 372                                bool (*)(basic_block, void *),
 373                                basic_block *, int, void *);
 374 extern void dump_edge_info (FILE *, edge, int);
 375 extern void clear_edges (void);
 376 extern void mark_critical_edges (void);
 377 extern rtx first_insn_after_basic_block_note (basic_block);
 378
 379 /* Dominator information for basic blocks.  */
 380
 381 typedef struct dominance_info *dominance_info;
 382
 383 /* Structure to group all of the information to process IF-THEN and
 384    IF-THEN-ELSE blocks for the conditional execution support.  This
 385    needs to be in a public file in case the IFCVT macros call
 386    functions passing the ce_if_block data structure.  */
 387
 388 typedef struct ce_if_block
 389 {
 390   basic_block test_bb;                  /* First test block.  */
 391   basic_block then_bb;                  /* THEN block.  */
 392   basic_block else_bb;                  /* ELSE block or NULL.  */
 393   basic_block join_bb;                  /* Join THEN/ELSE blocks.  */
 394   basic_block last_test_bb;             /* Last bb to hold && or || tests.  */
 395   int num_multiple_test_blocks;         /* # of && and || basic blocks.  */
 396   int num_and_and_blocks;               /* # of && blocks.  */
 397   int num_or_or_blocks;                 /* # of || blocks.  */
 398   int num_multiple_test_insns;          /* # of insns in && and || blocks.  */
 399   int and_and_p;                        /* Complex test is &&.  */
 400   int num_then_insns;                   /* # of insns in THEN block.  */
 401   int num_else_insns;                   /* # of insns in ELSE block.  */
 402   int pass;                             /* Pass number.  */
 403
 404 #ifdef IFCVT_EXTRA_FIELDS
 405   IFCVT_EXTRA_FIELDS                    /* Any machine dependent fields.  */
 406 #endif
 407
 408 } ce_if_block_t;
 409
 410 /* This structure maintains an edge list vector.  */
 411 struct edge_list
 412 {
 413   int num_blocks;
 414   int num_edges;
 415   edge *index_to_edge;
 416 };
 417
 418 /* This is the value which indicates no edge is present.  */
 419 #define EDGE_INDEX_NO_EDGE      -1
 420
 421 /* EDGE_INDEX returns an integer index for an edge, or EDGE_INDEX_NO_EDGE
 422    if there is no edge between the 2 basic blocks.  */
 423 #define EDGE_INDEX(el, pred, succ) (find_edge_index ((el), (pred), (succ)))
 424
 425 /* INDEX_EDGE_PRED_BB and INDEX_EDGE_SUCC_BB return a pointer to the basic
 426    block which is either the pred or succ end of the indexed edge.  */
 427 #define INDEX_EDGE_PRED_BB(el, index)   ((el)->index_to_edge[(index)]->src)
 428 #define INDEX_EDGE_SUCC_BB(el, index)   ((el)->index_to_edge[(index)]->dest)
 429
 430 /* INDEX_EDGE returns a pointer to the edge.  */
 431 #define INDEX_EDGE(el, index)           ((el)->index_to_edge[(index)])
 432
 433 /* Number of edges in the compressed edge list.  */
 434 #define NUM_EDGES(el)                   ((el)->num_edges)
 435
 436 /* BB is assumed to contain conditional jump.  Return the fallthru edge.  */
 437 #define FALLTHRU_EDGE(bb)               ((bb)->succ->flags & EDGE_FALLTHRU \
 438                                          ? (bb)->succ : (bb)->succ->succ_next)
 439
 440 /* BB is assumed to contain conditional jump.  Return the branch edge.  */
 441 #define BRANCH_EDGE(bb)                 ((bb)->succ->flags & EDGE_FALLTHRU \
 442                                          ? (bb)->succ->succ_next : (bb)->succ)
 443
 444 /* Return expected execution frequency of the edge E.  */
 445 #define EDGE_FREQUENCY(e)               (((e)->src->frequency \
 446                                           * (e)->probability \
 447                                           + REG_BR_PROB_BASE / 2) \
 448                                          / REG_BR_PROB_BASE)
 449
 450 /* Return nonzero if edge is critical.  */
 451 #define EDGE_CRITICAL_P(e)              ((e)->src->succ->succ_next \
 452                                          && (e)->dest->pred->pred_next)
 453
 454 struct edge_list * create_edge_list (void);
 455 void free_edge_list (struct edge_list *);
 456 void print_edge_list (FILE *, struct edge_list *);
 457 void verify_edge_list (FILE *, struct edge_list *);
 458 int find_edge_index (struct edge_list *, basic_block, basic_block);
 459
 460
 461 enum update_life_extent
 462 {
 463   UPDATE_LIFE_LOCAL = 0,
 464   UPDATE_LIFE_GLOBAL = 1,
 465   UPDATE_LIFE_GLOBAL_RM_NOTES = 2
 466 };
 467
 468 /* Flags for life_analysis and update_life_info.  */
 469
 470 #define PROP_DEATH_NOTES        1       /* Create DEAD and UNUSED notes.  */
 471 #define PROP_LOG_LINKS          2       /* Create LOG_LINKS.  */
 472 #define PROP_REG_INFO           4       /* Update regs_ever_live et al.  */
 473 #define PROP_KILL_DEAD_CODE     8       /* Remove dead code.  */
 474 #define PROP_SCAN_DEAD_CODE     16      /* Scan for dead code.  */
 475 #define PROP_ALLOW_CFG_CHANGES  32      /* Allow the CFG to be changed
 476                                            by dead code removal.  */
 477 #define PROP_AUTOINC            64      /* Create autoinc mem references.  */
 478 #define PROP_EQUAL_NOTES        128     /* Take into account REG_EQUAL notes.  */
 479 #define PROP_SCAN_DEAD_STORES   256     /* Scan for dead code.  */
 480 #define PROP_FINAL              (PROP_DEATH_NOTES | PROP_LOG_LINKS  \
 481                                  | PROP_REG_INFO | PROP_KILL_DEAD_CODE  \
 482                                  | PROP_SCAN_DEAD_CODE | PROP_AUTOINC \
 483                                  | PROP_ALLOW_CFG_CHANGES \
 484                                  | PROP_SCAN_DEAD_STORES)
 485
 486 #define CLEANUP_EXPENSIVE       1       /* Do relatively expensive optimizations
 487                                            except for edge forwarding */
 488 #define CLEANUP_CROSSJUMP       2       /* Do crossjumping.  */
 489 #define CLEANUP_POST_REGSTACK   4       /* We run after reg-stack and need
 490                                            to care REG_DEAD notes.  */
 491 #define CLEANUP_PRE_SIBCALL     8       /* Do not get confused by code hidden
 492                                            inside call_placeholders..  */
 493 #define CLEANUP_PRE_LOOP        16      /* Take care to preserve syntactic loop
 494                                            notes.  */
 495 #define CLEANUP_UPDATE_LIFE     32      /* Keep life information up to date.  */
 496 #define CLEANUP_THREADING       64      /* Do jump threading.  */
 497 #define CLEANUP_NO_INSN_DEL     128     /* Do not try to delete trivially dead
 498                                            insns.  */
 499 #define CLEANUP_CFGLAYOUT       256     /* Do cleanup in cfglayout mode.  */
 500 extern void life_analysis (rtx, FILE *, int);
 501 extern int update_life_info (sbitmap, enum update_life_extent, int);
 502 extern int update_life_info_in_dirty_blocks (enum update_life_extent, int);
 503 extern int count_or_remove_death_notes (sbitmap, int);
 504 extern int propagate_block (basic_block, regset, regset, regset, int);
 505
 506 struct propagate_block_info;
 507 extern rtx propagate_one_insn (struct propagate_block_info *, rtx);
 508 extern struct propagate_block_info *init_propagate_block_info
 509  (basic_block, regset, regset, regset, int);
 510 extern void free_propagate_block_info (struct propagate_block_info *);
 511
 512 /* In lcm.c */
 513 extern struct edge_list *pre_edge_lcm (FILE *, int, sbitmap *, sbitmap *,
 514                                        sbitmap *, sbitmap *, sbitmap **,
 515                                        sbitmap **);
 516 extern struct edge_list *pre_edge_rev_lcm (FILE *, int, sbitmap *,
 517                                            sbitmap *, sbitmap *,
 518                                            sbitmap *, sbitmap **,
 519                                            sbitmap **);
 520 extern void compute_available (sbitmap *, sbitmap *, sbitmap *, sbitmap *);
 521 extern int optimize_mode_switching (FILE *);
 522
 523 /* In emit-rtl.c.  */
 524 extern rtx emit_block_insn_after (rtx, rtx, basic_block);
 525 extern rtx emit_block_insn_before (rtx, rtx, basic_block);
 526
 527 /* In predict.c */
 528 extern void estimate_probability (struct loops *);
 529 extern void note_prediction_to_br_prob (void);
 530 extern void expected_value_to_br_prob (void);
 531 extern bool maybe_hot_bb_p (basic_block);
 532 extern bool probably_cold_bb_p (basic_block);
 533 extern bool probably_never_executed_bb_p (basic_block);
 534
 535 /* In flow.c */
 536 extern void init_flow (void);
 537 extern void dump_bb (basic_block, FILE *);
 538 extern void debug_bb (basic_block);
 539 extern basic_block debug_bb_n (int);
 540 extern void dump_regset (regset, FILE *);
 541 extern void debug_regset (regset);
 542 extern void allocate_reg_life_data (void);
 543 extern void allocate_bb_life_data (void);
 544 extern void expunge_block (basic_block);
 545 extern void link_block (basic_block, basic_block);
 546 extern void unlink_block (basic_block);
 547 extern void compact_blocks (void);
 548 extern basic_block alloc_block (void);
 549 extern void find_unreachable_blocks (void);
 550 extern int delete_noop_moves (rtx);
 551 extern basic_block force_nonfallthru (edge);
 552 extern rtx block_label (basic_block);
 553 extern bool forwarder_block_p (basic_block);
 554 extern bool purge_all_dead_edges (int);
 555 extern bool purge_dead_edges (basic_block);
 556 extern void find_sub_basic_blocks (basic_block);
 557 extern void find_many_sub_basic_blocks (sbitmap);
 558 extern bool can_fallthru (basic_block, basic_block);
 559 extern void flow_nodes_print (const char *, const sbitmap, FILE *);
 560 extern void flow_edge_list_print (const char *, const edge *, int, FILE *);
 561 extern void alloc_aux_for_block (basic_block, int);
 562 extern void alloc_aux_for_blocks (int);
 563 extern void clear_aux_for_blocks (void);
 564 extern void free_aux_for_blocks (void);
 565 extern void alloc_aux_for_edge (edge, int);
 566 extern void alloc_aux_for_edges (int);
 567 extern void clear_aux_for_edges (void);
 568 extern void free_aux_for_edges (void);
 569
 570 /* This function is always defined so it can be called from the
 571    debugger, and it is declared extern so we don't get warnings about
 572    it being unused.  */
 573 extern void verify_flow_info (void);
 574
 575 typedef struct conflict_graph_def *conflict_graph;
 576
 577 /* Callback function when enumerating conflicts.  The arguments are
 578    the smaller and larger regno in the conflict.  Returns zero if
 579    enumeration is to continue, nonzero to halt enumeration.  */
 580 typedef int (*conflict_graph_enum_fn) (int, int, void *);
 581
 582
 583 /* Prototypes of operations on conflict graphs.  */
 584
 585 extern conflict_graph conflict_graph_new
 586  (int);
 587 extern void conflict_graph_delete (conflict_graph);
 588 extern int conflict_graph_add (conflict_graph, int, int);
 589 extern int conflict_graph_conflict_p (conflict_graph, int, int);
 590 extern void conflict_graph_enum (conflict_graph, int, conflict_graph_enum_fn,
 591                                  void *);
 592 extern void conflict_graph_merge_regs (conflict_graph, int, int);
 593 extern void conflict_graph_print (conflict_graph, FILE*);
 594 extern conflict_graph conflict_graph_compute (regset, partition);
 595 extern bool mark_dfs_back_edges (void);
 596 extern void set_edge_can_fallthru_flag (void);
 597 extern void update_br_prob_note (basic_block);
 598 extern void fixup_abnormal_edges (void);
 599 extern bool can_hoist_insn_p (rtx, rtx, regset);
 600 extern rtx hoist_insn_after (rtx, rtx, rtx, rtx);
 601 extern rtx hoist_insn_to_edge (rtx, edge, rtx, rtx);
 602 extern bool inside_basic_block_p (rtx);
 603 extern bool control_flow_insn_p (rtx);
 604
 605 /* In bb-reorder.c */
 606 extern void reorder_basic_blocks (void);
 607
 608 /* In dominance.c */
 609
 610 enum cdi_direction
 611 {
 612   CDI_DOMINATORS,
 613   CDI_POST_DOMINATORS
 614 };
 615
 616 extern dominance_info calculate_dominance_info (enum cdi_direction);
 617 extern void free_dominance_info (dominance_info);
 618 extern basic_block nearest_common_dominator (dominance_info,
 619                                              basic_block, basic_block);
 620 extern void set_immediate_dominator (dominance_info, basic_block,
 621                                      basic_block);
 622 extern basic_block get_immediate_dominator (dominance_info, basic_block);
 623 extern bool dominated_by_p (dominance_info, basic_block, basic_block);
 624 extern int get_dominated_by (dominance_info, basic_block, basic_block **);
 625 extern void add_to_dominance_info (dominance_info, basic_block);
 626 extern void delete_from_dominance_info (dominance_info, basic_block);
 627 basic_block recount_dominator (dominance_info, basic_block);
 628 extern void redirect_immediate_dominators (dominance_info, basic_block,
 629                                            basic_block);
 630 void iterate_fix_dominators (dominance_info, basic_block *, int);
 631 extern void verify_dominators (dominance_info);
 632
 633 #include "cfghooks.h"
 634
 635 #endif /* GCC_BASIC_BLOCK_H */