1 /* Define control and data flow tables, and regsets.
2 Copyright (C) 1987, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
3 Free Software Foundation, Inc.
5 This file is part of GCC.
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
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
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
22 #ifndef GCC_BASIC_BLOCK_H
23 #define GCC_BASIC_BLOCK_H
28 #include "partition.h"
29 #include "hard-reg-set.h"
34 /* Head of register set linked list. */
35 typedef bitmap_head regset_head;
37 /* A pointer to a regset_head. */
38 typedef bitmap regset;
40 /* Initialize a new regset. */
41 #define INIT_REG_SET(HEAD) bitmap_initialize (HEAD, 1)
43 /* Clear a register set by freeing up the linked list. */
44 #define CLEAR_REG_SET(HEAD) bitmap_clear (HEAD)
46 /* Copy a register set to another register set. */
47 #define COPY_REG_SET(TO, FROM) bitmap_copy (TO, FROM)
49 /* Compare two register sets. */
50 #define REG_SET_EQUAL_P(A, B) bitmap_equal_p (A, B)
52 /* `and' a register set with a second register set. */
53 #define AND_REG_SET(TO, FROM) bitmap_and_into (TO, FROM)
55 /* `and' the complement of a register set with a register set. */
56 #define AND_COMPL_REG_SET(TO, FROM) bitmap_and_compl_into (TO, FROM)
58 /* Inclusive or a register set with a second register set. */
59 #define IOR_REG_SET(TO, FROM) bitmap_ior_into (TO, FROM)
61 /* Exclusive or a register set with a second register set. */
62 #define XOR_REG_SET(TO, FROM) bitmap_xor_into (TO, FROM)
64 /* Or into TO the register set FROM1 `and'ed with the complement of FROM2. */
65 #define IOR_AND_COMPL_REG_SET(TO, FROM1, FROM2) \
66 bitmap_ior_and_compl_into (TO, FROM1, FROM2)
68 /* Clear a single register in a register set. */
69 #define CLEAR_REGNO_REG_SET(HEAD, REG) bitmap_clear_bit (HEAD, REG)
71 /* Set a single register in a register set. */
72 #define SET_REGNO_REG_SET(HEAD, REG) bitmap_set_bit (HEAD, REG)
74 /* Return true if a register is set in a register set. */
75 #define REGNO_REG_SET_P(TO, REG) bitmap_bit_p (TO, REG)
77 /* Copy the hard registers in a register set to the hard register set. */
78 extern void reg_set_to_hard_reg_set (HARD_REG_SET *, bitmap);
79 #define REG_SET_TO_HARD_REG_SET(TO, FROM) \
81 CLEAR_HARD_REG_SET (TO); \
82 reg_set_to_hard_reg_set (&TO, FROM); \
85 typedef bitmap_iterator reg_set_iterator;
87 /* Loop over all registers in REGSET, starting with MIN, setting REGNUM to the
88 register number and executing CODE for all registers that are set. */
89 #define EXECUTE_IF_SET_IN_REG_SET(REGSET, MIN, REGNUM, RSI) \
90 EXECUTE_IF_SET_IN_BITMAP (REGSET, MIN, REGNUM, RSI)
92 /* Loop over all registers in REGSET1 and REGSET2, starting with MIN, setting
93 REGNUM to the register number and executing CODE for all registers that are
94 set in the first regset and not set in the second. */
95 #define EXECUTE_IF_AND_COMPL_IN_REG_SET(REGSET, MIN, REGNUM, RSI) \
96 EXECUTE_IF_AND_COMPL_IN_BITMAP (REGSET, MIN, REGNUM, RSI)
98 /* Loop over all registers in REGSET1 and REGSET2, starting with MIN, setting
99 REGNUM to the register number and executing CODE for all registers that are
100 set in both regsets. */
101 #define EXECUTE_IF_AND_IN_REG_SET(REGSET1, REGSET2, MIN, REGNUM, RSI) \
102 EXECUTE_IF_AND_IN_BITMAP (REGSET1, REGSET2, MIN, REGNUM, RSI) \
104 /* Allocate a register set with oballoc. */
105 #define OBSTACK_ALLOC_REG_SET(OBSTACK) BITMAP_OBSTACK_ALLOC (OBSTACK)
107 /* Initialize a register set. Returns the new register set. */
108 #define INITIALIZE_REG_SET(HEAD) bitmap_initialize (&HEAD, 1)
110 /* Do any cleanup needed on a regset when it is no longer used. */
111 #define FREE_REG_SET(REGSET) BITMAP_FREE(REGSET)
113 /* Allocate a register set with xmalloc. */
114 #define XMALLOC_REG_SET() BITMAP_XMALLOC ()
116 /* Free a register set. */
117 #define XFREE_REG_SET(REGSET) BITMAP_XFREE (REGSET)
119 /* Do any one-time initializations needed for regsets. */
120 #define INIT_ONCE_REG_SET() BITMAP_INIT_ONCE ()
122 /* Grow any tables needed when the number of registers is calculated
123 or extended. For the linked list allocation, nothing needs to
124 be done, other than zero the statistics on the first allocation. */
125 #define MAX_REGNO_REG_SET(NUM_REGS, NEW_P, RENUMBER_P)
127 /* Type we use to hold basic block counters. Should be at least
128 64bit. Although a counter cannot be negative, we use a signed
129 type, because erroneous negative counts can be generated when the
130 flow graph is manipulated by various optimizations. A signed type
131 makes those easy to detect. */
132 typedef HOST_WIDEST_INT gcov_type;
134 /* Control flow edge information. */
135 struct edge_def GTY(())
137 /* The two blocks at the ends of the edge. */
138 struct basic_block_def *src;
139 struct basic_block_def *dest;
141 /* Instructions queued on the edge. */
142 union edge_def_insns {
143 rtx GTY ((tag ("0"))) r;
144 tree GTY ((tag ("1"))) t;
145 } GTY ((desc ("ir_type ()"))) insns;
147 /* Auxiliary info specific to a pass. */
148 PTR GTY ((skip (""))) aux;
150 /* Location of any goto implicit in the edge, during tree-ssa. */
151 source_locus goto_locus;
153 int flags; /* see EDGE_* below */
154 int probability; /* biased by REG_BR_PROB_BASE */
155 gcov_type count; /* Expected number of executions calculated
159 typedef struct edge_def *edge;
162 #define EDGE_FALLTHRU 1 /* 'Straight line' flow */
163 #define EDGE_ABNORMAL 2 /* Strange flow, like computed
165 #define EDGE_ABNORMAL_CALL 4 /* Call with abnormal exit
166 like an exception, or sibcall */
167 #define EDGE_EH 8 /* Exception throw */
168 #define EDGE_FAKE 16 /* Not a real edge (profile.c) */
169 #define EDGE_DFS_BACK 32 /* A backwards edge */
170 #define EDGE_CAN_FALLTHRU 64 /* Candidate for straight line
172 #define EDGE_IRREDUCIBLE_LOOP 128 /* Part of irreducible loop. */
173 #define EDGE_SIBCALL 256 /* Edge from sibcall to exit. */
174 #define EDGE_LOOP_EXIT 512 /* Exit of a loop. */
175 #define EDGE_TRUE_VALUE 1024 /* Edge taken when controlling
176 predicate is nonzero. */
177 #define EDGE_FALSE_VALUE 2048 /* Edge taken when controlling
178 predicate is zero. */
179 #define EDGE_EXECUTABLE 4096 /* Edge is executable. Only
180 valid during SSA-CCP. */
181 #define EDGE_CROSSING 8192 /* Edge crosses between hot
182 and cold sections, when we
184 #define EDGE_ALL_FLAGS 16383
186 #define EDGE_COMPLEX (EDGE_ABNORMAL | EDGE_ABNORMAL_CALL | EDGE_EH)
188 /* Counter summary from the last set of coverage counts read by
190 extern const struct gcov_ctr_summary *profile_info;
192 /* Declared in cfgloop.h. */
196 /* Declared in tree-flow.h. */
199 /* A basic block is a sequence of instructions with only entry and
200 only one exit. If any one of the instructions are executed, they
201 will all be executed, and in sequence from first to last.
203 There may be COND_EXEC instructions in the basic block. The
204 COND_EXEC *instructions* will be executed -- but if the condition
205 is false the conditionally executed *expressions* will of course
206 not be executed. We don't consider the conditionally executed
207 expression (which might have side-effects) to be in a separate
208 basic block because the program counter will always be at the same
209 location after the COND_EXEC instruction, regardless of whether the
210 condition is true or not.
212 Basic blocks need not start with a label nor end with a jump insn.
213 For example, a previous basic block may just "conditionally fall"
214 into the succeeding basic block, and the last basic block need not
215 end with a jump insn. Block 0 is a descendant of the entry block.
217 A basic block beginning with two labels cannot have notes between
220 Data for jump tables are stored in jump_insns that occur in no
221 basic block even though these insns can follow or precede insns in
224 /* Basic block information indexed by block number. */
225 struct basic_block_def GTY((chain_next ("%h.next_bb"), chain_prev ("%h.prev_bb")))
227 /* The first and last insns of the block. */
231 /* Pointers to the first and last trees of the block. */
234 /* The edges into and out of the block. */
238 /* The registers that are live on entry to this block. */
239 bitmap GTY ((skip (""))) global_live_at_start;
241 /* The registers that are live on exit from this block. */
242 bitmap GTY ((skip (""))) global_live_at_end;
244 /* Auxiliary info specific to a pass. */
245 PTR GTY ((skip (""))) aux;
247 /* Innermost loop containing the block. */
248 struct loop * GTY ((skip (""))) loop_father;
250 /* The dominance and postdominance information node. */
251 struct et_node * GTY ((skip (""))) dom[2];
253 /* Previous and next blocks in the chain. */
254 struct basic_block_def *prev_bb;
255 struct basic_block_def *next_bb;
257 /* The data used by basic block copying and reordering functions. */
258 struct reorder_block_def * GTY ((skip (""))) rbi;
260 /* Annotations used at the tree level. */
261 struct bb_ann_d *tree_annotations;
263 /* Expected number of executions: calculated in profile.c. */
266 /* The index of this block. */
269 /* The loop depth of this block. */
272 /* Expected frequency. Normalized to be in range 0 to BB_FREQ_MAX. */
275 /* Various flags. See BB_* below. */
279 typedef struct basic_block_def *basic_block;
281 /* Structure to hold information about the blocks during reordering and
284 typedef struct reorder_block_def
289 basic_block original;
290 /* Used by loop copying. */
295 /* These fields are used by bb-reorder pass. */
297 } *reorder_block_def_p;
299 #define BB_FREQ_MAX 10000
301 /* Masks for basic_block.flags. */
304 #define BB_REACHABLE 4
306 #define BB_IRREDUCIBLE_LOOP 16
307 #define BB_SUPERBLOCK 32
308 #define BB_DISABLE_SCHEDULE 64
310 #define BB_HOT_PARTITION 128
311 #define BB_COLD_PARTITION 256
312 #define BB_UNPARTITIONED 0
314 /* Partitions, to be used when partitioning hot and cold basic blocks into
315 separate sections. */
316 #define BB_PARTITION(bb) ((bb)->flags & (BB_HOT_PARTITION|BB_COLD_PARTITION))
317 #define BB_SET_PARTITION(bb, part) do { \
318 basic_block bb_ = (bb); \
319 bb_->flags = ((bb_->flags & ~(BB_HOT_PARTITION|BB_COLD_PARTITION)) \
323 #define BB_COPY_PARTITION(dstbb, srcbb) \
324 BB_SET_PARTITION (dstbb, BB_PARTITION (srcbb))
326 /* Number of basic blocks in the current function. */
328 extern int n_basic_blocks;
330 /* First free basic block number. */
332 extern int last_basic_block;
334 /* Number of edges in the current function. */
338 /* Signalize the status of profile information in the CFG. */
339 extern enum profile_status
346 /* Index by basic block number, get basic block struct info. */
348 extern GTY(()) varray_type basic_block_info;
350 #define BASIC_BLOCK(N) (VARRAY_BB (basic_block_info, (N)))
352 /* For iterating over basic blocks. */
353 #define FOR_BB_BETWEEN(BB, FROM, TO, DIR) \
354 for (BB = FROM; BB != TO; BB = BB->DIR)
356 #define FOR_EACH_BB(BB) \
357 FOR_BB_BETWEEN (BB, ENTRY_BLOCK_PTR->next_bb, EXIT_BLOCK_PTR, next_bb)
359 #define FOR_EACH_BB_REVERSE(BB) \
360 FOR_BB_BETWEEN (BB, EXIT_BLOCK_PTR->prev_bb, ENTRY_BLOCK_PTR, prev_bb)
362 /* For iterating over insns in basic block. */
363 #define FOR_BB_INSNS(BB, INSN) \
364 for ((INSN) = BB_HEAD (BB); \
365 (INSN) != NEXT_INSN (BB_END (BB)); \
366 (INSN) = NEXT_INSN (INSN))
368 #define FOR_BB_INSNS_REVERSE(BB, INSN) \
369 for ((INSN) = BB_END (BB); \
370 (INSN) != PREV_INSN (BB_HEAD (BB)); \
371 (INSN) = PREV_INSN (INSN))
373 /* Cycles through _all_ basic blocks, even the fake ones (entry and
376 #define FOR_ALL_BB(BB) \
377 for (BB = ENTRY_BLOCK_PTR; BB; BB = BB->next_bb)
379 /* What registers are live at the setjmp call. */
381 extern regset regs_live_at_setjmp;
383 /* Special labels found during CFG build. */
385 extern GTY(()) rtx label_value_list;
387 extern struct obstack flow_obstack;
389 /* Indexed by n, gives number of basic block that (REG n) is used in.
390 If the value is REG_BLOCK_GLOBAL (-2),
391 it means (REG n) is used in more than one basic block.
392 REG_BLOCK_UNKNOWN (-1) means it hasn't been seen yet so we don't know.
393 This information remains valid for the rest of the compilation
394 of the current function; it is used to control register allocation. */
396 #define REG_BLOCK_UNKNOWN -1
397 #define REG_BLOCK_GLOBAL -2
399 #define REG_BASIC_BLOCK(N) (VARRAY_REG (reg_n_info, N)->basic_block)
401 /* Stuff for recording basic block info. */
403 #define BB_HEAD(B) (B)->head_
404 #define BB_END(B) (B)->end_
406 /* Special block numbers [markers] for entry and exit. */
407 #define ENTRY_BLOCK (-1)
408 #define EXIT_BLOCK (-2)
410 /* Special block number not valid for any block. */
411 #define INVALID_BLOCK (-3)
413 /* Similarly, block pointers for the edge list. */
414 extern GTY(()) basic_block ENTRY_BLOCK_PTR;
415 extern GTY(()) basic_block EXIT_BLOCK_PTR;
417 #define BLOCK_NUM(INSN) (BLOCK_FOR_INSN (INSN)->index + 0)
418 #define set_block_for_insn(INSN, BB) (BLOCK_FOR_INSN (INSN) = BB)
420 extern void compute_bb_for_insn (void);
421 extern void free_bb_for_insn (void);
422 extern void update_bb_for_insn (basic_block);
424 extern void free_basic_block_vars (void);
426 extern void insert_insn_on_edge (rtx, edge);
427 bool safe_insert_insn_on_edge (rtx, edge);
429 extern void commit_edge_insertions (void);
430 extern void commit_edge_insertions_watch_calls (void);
432 extern void remove_fake_edges (void);
433 extern void remove_fake_exit_edges (void);
434 extern void add_noreturn_fake_exit_edges (void);
435 extern void connect_infinite_loops_to_exit (void);
436 extern edge unchecked_make_edge (basic_block, basic_block, int);
437 extern edge cached_make_edge (sbitmap *, basic_block, basic_block, int);
438 extern edge make_edge (basic_block, basic_block, int);
439 extern edge make_single_succ_edge (basic_block, basic_block, int);
440 extern void remove_edge (edge);
441 extern void redirect_edge_succ (edge, basic_block);
442 extern edge redirect_edge_succ_nodup (edge, basic_block);
443 extern void redirect_edge_pred (edge, basic_block);
444 extern basic_block create_basic_block_structure (rtx, rtx, rtx, basic_block);
445 extern void clear_bb_flags (void);
446 extern void flow_reverse_top_sort_order_compute (int *);
447 extern int flow_depth_first_order_compute (int *, int *);
448 extern int dfs_enumerate_from (basic_block, int,
449 bool (*)(basic_block, void *),
450 basic_block *, int, void *);
451 extern void compute_dominance_frontiers (bitmap *);
452 extern void dump_edge_info (FILE *, edge, int);
453 extern void brief_dump_cfg (FILE *);
454 extern void clear_edges (void);
455 extern rtx first_insn_after_basic_block_note (basic_block);
457 /* Structure to group all of the information to process IF-THEN and
458 IF-THEN-ELSE blocks for the conditional execution support. This
459 needs to be in a public file in case the IFCVT macros call
460 functions passing the ce_if_block data structure. */
462 typedef struct ce_if_block
464 basic_block test_bb; /* First test block. */
465 basic_block then_bb; /* THEN block. */
466 basic_block else_bb; /* ELSE block or NULL. */
467 basic_block join_bb; /* Join THEN/ELSE blocks. */
468 basic_block last_test_bb; /* Last bb to hold && or || tests. */
469 int num_multiple_test_blocks; /* # of && and || basic blocks. */
470 int num_and_and_blocks; /* # of && blocks. */
471 int num_or_or_blocks; /* # of || blocks. */
472 int num_multiple_test_insns; /* # of insns in && and || blocks. */
473 int and_and_p; /* Complex test is &&. */
474 int num_then_insns; /* # of insns in THEN block. */
475 int num_else_insns; /* # of insns in ELSE block. */
476 int pass; /* Pass number. */
478 #ifdef IFCVT_EXTRA_FIELDS
479 IFCVT_EXTRA_FIELDS /* Any machine dependent fields. */
484 /* This structure maintains an edge list vector. */
492 /* This is the value which indicates no edge is present. */
493 #define EDGE_INDEX_NO_EDGE -1
495 /* EDGE_INDEX returns an integer index for an edge, or EDGE_INDEX_NO_EDGE
496 if there is no edge between the 2 basic blocks. */
497 #define EDGE_INDEX(el, pred, succ) (find_edge_index ((el), (pred), (succ)))
499 /* INDEX_EDGE_PRED_BB and INDEX_EDGE_SUCC_BB return a pointer to the basic
500 block which is either the pred or succ end of the indexed edge. */
501 #define INDEX_EDGE_PRED_BB(el, index) ((el)->index_to_edge[(index)]->src)
502 #define INDEX_EDGE_SUCC_BB(el, index) ((el)->index_to_edge[(index)]->dest)
504 /* INDEX_EDGE returns a pointer to the edge. */
505 #define INDEX_EDGE(el, index) ((el)->index_to_edge[(index)])
507 /* Number of edges in the compressed edge list. */
508 #define NUM_EDGES(el) ((el)->num_edges)
510 /* BB is assumed to contain conditional jump. Return the fallthru edge. */
511 #define FALLTHRU_EDGE(bb) (EDGE_SUCC ((bb), 0)->flags & EDGE_FALLTHRU \
512 ? EDGE_SUCC ((bb), 0) : EDGE_SUCC ((bb), 1))
514 /* BB is assumed to contain conditional jump. Return the branch edge. */
515 #define BRANCH_EDGE(bb) (EDGE_SUCC ((bb), 0)->flags & EDGE_FALLTHRU \
516 ? EDGE_SUCC ((bb), 1) : EDGE_SUCC ((bb), 0))
518 /* Return expected execution frequency of the edge E. */
519 #define EDGE_FREQUENCY(e) (((e)->src->frequency \
521 + REG_BR_PROB_BASE / 2) \
524 /* Return nonzero if edge is critical. */
525 #define EDGE_CRITICAL_P(e) (EDGE_COUNT ((e)->src->succs) >= 2 \
526 && EDGE_COUNT ((e)->dest->preds) >= 2)
528 #define EDGE_COUNT(ev) VEC_length (edge, (ev))
529 #define EDGE_I(ev,i) VEC_index (edge, (ev), (i))
530 #define EDGE_PRED(bb,i) VEC_index (edge, (bb)->preds, (i))
531 #define EDGE_SUCC(bb,i) VEC_index (edge, (bb)->succs, (i))
533 /* Iterator object for edges. */
537 VEC(edge) **container;
540 static inline VEC(edge) *
541 ei_container (edge_iterator i)
543 gcc_assert (i.container);
547 #define ei_start(iter) ei_start_1 (&(iter))
548 #define ei_last(iter) ei_last_1 (&(iter))
550 /* Return an iterator pointing to the start of an edge vector. */
551 static inline edge_iterator
552 ei_start_1 (VEC(edge) **ev)
562 /* Return an iterator pointing to the last element of an edge
564 static inline edge_iterator
565 ei_last_1 (VEC(edge) **ev)
569 i.index = EDGE_COUNT (*ev) - 1;
575 /* Is the iterator `i' at the end of the sequence? */
577 ei_end_p (edge_iterator i)
579 return (i.index == EDGE_COUNT (ei_container (i)));
582 /* Is the iterator `i' at one position before the end of the
585 ei_one_before_end_p (edge_iterator i)
587 return (i.index + 1 == EDGE_COUNT (ei_container (i)));
590 /* Advance the iterator to the next element. */
592 ei_next (edge_iterator *i)
594 gcc_assert (i->index < EDGE_COUNT (ei_container (*i)));
598 /* Move the iterator to the previous element. */
600 ei_prev (edge_iterator *i)
602 gcc_assert (i->index > 0);
606 /* Return the edge pointed to by the iterator `i'. */
608 ei_edge (edge_iterator i)
610 return EDGE_I (ei_container (i), i.index);
613 /* Return an edge pointed to by the iterator. Do it safely so that
614 NULL is returned when the iterator is pointing at the end of the
617 ei_safe_edge (edge_iterator i)
619 return !ei_end_p (i) ? ei_edge (i) : NULL;
622 /* This macro serves as a convenient way to iterate each edge in a
623 vector of predecessor or successor edges. It must not be used when
624 an element might be removed during the traversal, otherwise
625 elements will be missed. Instead, use a for-loop like that shown
626 in the following pseudo-code:
628 FOR (ei = ei_start (bb->succs); (e = ei_safe_edge (ei)); )
637 #define FOR_EACH_EDGE(EDGE,ITER,EDGE_VEC) \
638 for ((EDGE) = NULL, (ITER) = ei_start ((EDGE_VEC)); \
639 ((EDGE) = ei_safe_edge ((ITER))); \
642 struct edge_list * create_edge_list (void);
643 void free_edge_list (struct edge_list *);
644 void print_edge_list (FILE *, struct edge_list *);
645 void verify_edge_list (FILE *, struct edge_list *);
646 int find_edge_index (struct edge_list *, basic_block, basic_block);
647 edge find_edge (basic_block, basic_block);
650 enum update_life_extent
652 UPDATE_LIFE_LOCAL = 0,
653 UPDATE_LIFE_GLOBAL = 1,
654 UPDATE_LIFE_GLOBAL_RM_NOTES = 2
657 /* Flags for life_analysis and update_life_info. */
659 #define PROP_DEATH_NOTES 1 /* Create DEAD and UNUSED notes. */
660 #define PROP_LOG_LINKS 2 /* Create LOG_LINKS. */
661 #define PROP_REG_INFO 4 /* Update regs_ever_live et al. */
662 #define PROP_KILL_DEAD_CODE 8 /* Remove dead code. */
663 #define PROP_SCAN_DEAD_CODE 16 /* Scan for dead code. */
664 #define PROP_ALLOW_CFG_CHANGES 32 /* Allow the CFG to be changed
665 by dead code removal. */
666 #define PROP_AUTOINC 64 /* Create autoinc mem references. */
667 #define PROP_EQUAL_NOTES 128 /* Take into account REG_EQUAL notes. */
668 #define PROP_SCAN_DEAD_STORES 256 /* Scan for dead code. */
669 #define PROP_ASM_SCAN 512 /* Internal flag used within flow.c
670 to flag analysis of asms. */
671 #define PROP_FINAL (PROP_DEATH_NOTES | PROP_LOG_LINKS \
672 | PROP_REG_INFO | PROP_KILL_DEAD_CODE \
673 | PROP_SCAN_DEAD_CODE | PROP_AUTOINC \
674 | PROP_ALLOW_CFG_CHANGES \
675 | PROP_SCAN_DEAD_STORES)
676 #define PROP_POSTRELOAD (PROP_DEATH_NOTES \
677 | PROP_KILL_DEAD_CODE \
678 | PROP_SCAN_DEAD_CODE | PROP_AUTOINC \
679 | PROP_SCAN_DEAD_STORES)
681 #define CLEANUP_EXPENSIVE 1 /* Do relatively expensive optimizations
682 except for edge forwarding */
683 #define CLEANUP_CROSSJUMP 2 /* Do crossjumping. */
684 #define CLEANUP_POST_REGSTACK 4 /* We run after reg-stack and need
685 to care REG_DEAD notes. */
686 #define CLEANUP_PRE_LOOP 8 /* Take care to preserve syntactic loop
688 #define CLEANUP_UPDATE_LIFE 16 /* Keep life information up to date. */
689 #define CLEANUP_THREADING 32 /* Do jump threading. */
690 #define CLEANUP_NO_INSN_DEL 64 /* Do not try to delete trivially dead
692 #define CLEANUP_CFGLAYOUT 128 /* Do cleanup in cfglayout mode. */
693 #define CLEANUP_LOG_LINKS 256 /* Update log links. */
695 extern void life_analysis (FILE *, int);
696 extern int update_life_info (sbitmap, enum update_life_extent, int);
697 extern int update_life_info_in_dirty_blocks (enum update_life_extent, int);
698 extern int count_or_remove_death_notes (sbitmap, int);
699 extern int propagate_block (basic_block, regset, regset, regset, int);
701 struct propagate_block_info;
702 extern rtx propagate_one_insn (struct propagate_block_info *, rtx);
703 extern struct propagate_block_info *init_propagate_block_info
704 (basic_block, regset, regset, regset, int);
705 extern void free_propagate_block_info (struct propagate_block_info *);
708 extern struct edge_list *pre_edge_lcm (FILE *, int, sbitmap *, sbitmap *,
709 sbitmap *, sbitmap *, sbitmap **,
711 extern struct edge_list *pre_edge_rev_lcm (FILE *, int, sbitmap *,
712 sbitmap *, sbitmap *,
713 sbitmap *, sbitmap **,
715 extern void compute_available (sbitmap *, sbitmap *, sbitmap *, sbitmap *);
716 extern int optimize_mode_switching (FILE *);
719 extern void estimate_probability (struct loops *);
720 extern void expected_value_to_br_prob (void);
721 extern bool maybe_hot_bb_p (basic_block);
722 extern bool probably_cold_bb_p (basic_block);
723 extern bool probably_never_executed_bb_p (basic_block);
724 extern bool tree_predicted_by_p (basic_block, enum br_predictor);
725 extern bool rtl_predicted_by_p (basic_block, enum br_predictor);
726 extern void tree_predict_edge (edge, enum br_predictor, int);
727 extern void rtl_predict_edge (edge, enum br_predictor, int);
728 extern void predict_edge_def (edge, enum br_predictor, enum prediction);
729 extern void guess_outgoing_edge_probabilities (basic_block);
732 extern void init_flow (void);
733 extern void debug_bb (basic_block);
734 extern basic_block debug_bb_n (int);
735 extern void dump_regset (regset, FILE *);
736 extern void debug_regset (regset);
737 extern void allocate_reg_life_data (void);
738 extern void expunge_block (basic_block);
739 extern void link_block (basic_block, basic_block);
740 extern void unlink_block (basic_block);
741 extern void compact_blocks (void);
742 extern basic_block alloc_block (void);
743 extern void find_unreachable_blocks (void);
744 extern int delete_noop_moves (void);
745 extern basic_block force_nonfallthru (edge);
746 extern rtx block_label (basic_block);
747 extern bool forwarder_block_p (basic_block);
748 extern bool purge_all_dead_edges (int);
749 extern bool purge_dead_edges (basic_block);
750 extern void find_sub_basic_blocks (basic_block);
751 extern void find_many_sub_basic_blocks (sbitmap);
752 extern void rtl_make_eh_edge (sbitmap *, basic_block, rtx);
753 extern bool can_fallthru (basic_block, basic_block);
754 extern bool could_fall_through (basic_block, basic_block);
755 extern void flow_nodes_print (const char *, const sbitmap, FILE *);
756 extern void flow_edge_list_print (const char *, const edge *, int, FILE *);
757 extern void alloc_aux_for_block (basic_block, int);
758 extern void alloc_aux_for_blocks (int);
759 extern void clear_aux_for_blocks (void);
760 extern void free_aux_for_blocks (void);
761 extern void alloc_aux_for_edge (edge, int);
762 extern void alloc_aux_for_edges (int);
763 extern void clear_aux_for_edges (void);
764 extern void free_aux_for_edges (void);
765 extern void find_basic_blocks (rtx, int, FILE *);
766 extern bool cleanup_cfg (int);
767 extern bool delete_unreachable_blocks (void);
768 extern bool merge_seq_blocks (void);
770 typedef struct conflict_graph_def *conflict_graph;
772 /* Callback function when enumerating conflicts. The arguments are
773 the smaller and larger regno in the conflict. Returns zero if
774 enumeration is to continue, nonzero to halt enumeration. */
775 typedef int (*conflict_graph_enum_fn) (int, int, void *);
778 /* Prototypes of operations on conflict graphs. */
780 extern conflict_graph conflict_graph_new
782 extern void conflict_graph_delete (conflict_graph);
783 extern int conflict_graph_add (conflict_graph, int, int);
784 extern int conflict_graph_conflict_p (conflict_graph, int, int);
785 extern void conflict_graph_enum (conflict_graph, int, conflict_graph_enum_fn,
787 extern void conflict_graph_merge_regs (conflict_graph, int, int);
788 extern void conflict_graph_print (conflict_graph, FILE*);
789 extern bool mark_dfs_back_edges (void);
790 extern void set_edge_can_fallthru_flag (void);
791 extern void update_br_prob_note (basic_block);
792 extern void fixup_abnormal_edges (void);
793 extern bool inside_basic_block_p (rtx);
794 extern bool control_flow_insn_p (rtx);
796 /* In bb-reorder.c */
797 extern void reorder_basic_blocks (unsigned int);
798 extern void partition_hot_cold_basic_blocks (void);
801 extern void alloc_rbi_pool (void);
802 extern void initialize_bb_rbi (basic_block bb);
803 extern void free_rbi_pool (void);
815 DOM_NONE, /* Not computed at all. */
816 DOM_NO_FAST_QUERY, /* The data is OK, but the fast query data are not usable. */
817 DOM_OK /* Everything is ok. */
820 extern enum dom_state dom_computed[2];
822 extern bool dom_info_available_p (enum cdi_direction);
823 extern void calculate_dominance_info (enum cdi_direction);
824 extern void free_dominance_info (enum cdi_direction);
825 extern basic_block nearest_common_dominator (enum cdi_direction,
826 basic_block, basic_block);
827 extern void set_immediate_dominator (enum cdi_direction, basic_block,
829 extern basic_block get_immediate_dominator (enum cdi_direction, basic_block);
830 extern bool dominated_by_p (enum cdi_direction, basic_block, basic_block);
831 extern int get_dominated_by (enum cdi_direction, basic_block, basic_block **);
832 extern unsigned get_dominated_by_region (enum cdi_direction, basic_block *,
833 unsigned, basic_block *);
834 extern void add_to_dominance_info (enum cdi_direction, basic_block);
835 extern void delete_from_dominance_info (enum cdi_direction, basic_block);
836 basic_block recount_dominator (enum cdi_direction, basic_block);
837 extern void redirect_immediate_dominators (enum cdi_direction, basic_block,
839 extern void iterate_fix_dominators (enum cdi_direction, basic_block *, int);
840 extern void verify_dominators (enum cdi_direction);
841 extern basic_block first_dom_son (enum cdi_direction, basic_block);
842 extern basic_block next_dom_son (enum cdi_direction, basic_block);
843 extern edge try_redirect_by_replacing_jump (edge, basic_block, bool);
844 extern void break_superblocks (void);
845 extern void check_bb_profile (basic_block, FILE *);
846 extern void update_bb_profile_for_threading (basic_block, int, gcov_type, edge);
848 #include "cfghooks.h"
850 #endif /* GCC_BASIC_BLOCK_H */