1 /* Data and Control Flow Analysis for Trees.
2 Copyright (C) 2001, 2003, 2004, 2005, 2006, 2007
3 Free Software Foundation, Inc.
4 Contributed by Diego Novillo <dnovillo@redhat.com>
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3, or (at your option)
13 GCC is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
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/>. */
23 #define _TREE_FLOW_H 1
26 #include "hard-reg-set.h"
27 #include "basic-block.h"
29 #include "tree-gimple.h"
30 #include "tree-ssa-operands.h"
32 #include "ipa-reference.h"
34 /* Forward declare structures for the garbage collector GTY markers. */
35 #ifndef GCC_BASIC_BLOCK_H
37 typedef struct edge_def
*edge
;
38 struct basic_block_def
;
39 typedef struct basic_block_def
*basic_block
;
41 struct static_var_ann_d
;
43 /* Memory reference statistics for individual memory symbols,
44 collected during alias analysis. */
45 struct mem_sym_stats_d
GTY(())
50 /* Nonzero if this entry has been assigned a partition. */
51 unsigned int partitioned_p
: 1;
53 /* Nonzero if VAR is a memory partition tag that already contains
54 call-clobbered variables in its partition set. */
55 unsigned int has_call_clobbered_vars
: 1;
57 /* Number of direct reference sites. A direct reference to VAR is any
58 reference of the form 'VAR = ' or ' = VAR'. For GIMPLE reg
59 pointers, this is the number of sites where the pointer is
61 long num_direct_writes
;
62 long num_direct_reads
;
64 /* Number of indirect reference sites. An indirect reference to VAR
65 is any reference via a pointer that contains VAR in its points-to
66 set or, in the case of call-clobbered symbols, a function call. */
67 long num_indirect_writes
;
68 long num_indirect_reads
;
70 /* Execution frequency. This is the sum of the execution
71 frequencies of all the statements that reference this object
72 weighted by the number of references in each statement. This is
73 the main key used to sort the list of symbols to partition.
74 Symbols with high execution frequencies are put at the bottom of
75 the work list (ie, they are partitioned last).
76 Execution frequencies are taken directly from each basic block,
77 so compiling with PGO enabled will increase the precision of this
80 long frequency_writes
;
82 /* Set of memory tags that contain VAR in their alias set. */
86 typedef struct mem_sym_stats_d
*mem_sym_stats_t
;
87 DEF_VEC_P(mem_sym_stats_t
);
88 DEF_VEC_ALLOC_P(mem_sym_stats_t
, heap
);
90 /* Memory reference statistics collected during alias analysis. */
91 struct mem_ref_stats_d
GTY(())
93 /* Number of statements that make memory references. */
96 /* Number of statements that make function calls. */
99 /* Number of statements that make calls to pure/const functions. */
100 long num_pure_const_call_sites
;
102 /* Number of ASM statements. */
105 /* Estimated number of virtual operands needed as computed by
106 compute_memory_partitions. */
110 /* This maps every symbol used to make "memory" references
111 (pointers, arrays, structures, etc) to an instance of struct
112 mem_sym_stats_d describing reference statistics for the symbol. */
113 struct pointer_map_t
* GTY((skip
)) mem_sym_stats
;
117 /* Gimple dataflow datastructure. All publicly available fields shall have
118 gimple_ accessor defined in tree-flow-inline.h, all publicly modifiable
119 fields should have gimple_set accessor. */
120 struct gimple_df
GTY(())
122 /* Array of all variables referenced in the function. */
123 htab_t
GTY((param_is (struct int_tree_map
))) referenced_vars
;
125 /* A list of all the noreturn calls passed to modify_stmt.
126 cleanup_control_flow uses it to detect cases where a mid-block
127 indirect call has been turned into a noreturn call. When this
128 happens, all the instructions after the call are no longer
129 reachable and must be deleted as dead. */
130 VEC(tree
,gc
) *modified_noreturn_calls
;
132 /* Array of all SSA_NAMEs used in the function. */
133 VEC(tree
,gc
) *ssa_names
;
135 /* Artificial variable used to model the effects of function calls. */
138 /* Artificial variable used to model the effects of nonlocal
142 /* Call clobbered variables in the function. If bit I is set, then
143 REFERENCED_VARS (I) is call-clobbered. */
144 bitmap call_clobbered_vars
;
146 /* Addressable variables in the function. If bit I is set, then
147 REFERENCED_VARS (I) has had its address taken. Note that
148 CALL_CLOBBERED_VARS and ADDRESSABLE_VARS are not related. An
149 addressable variable is not necessarily call-clobbered (e.g., a
150 local addressable whose address does not escape) and not all
151 call-clobbered variables are addressable (e.g., a local static
153 bitmap addressable_vars
;
155 /* Free list of SSA_NAMEs. */
158 /* Hashtable holding definition for symbol. If this field is not NULL, it
159 means that the first reference to this variable in the function is a
160 USE or a VUSE. In those cases, the SSA renamer creates an SSA name
161 for this variable with an empty defining statement. */
162 htab_t
GTY((param_is (struct int_tree_map
))) default_defs
;
164 /* 'true' after aliases have been computed (see compute_may_aliases). */
165 unsigned int aliases_computed_p
: 1;
167 /* True if the code is in ssa form. */
168 unsigned int in_ssa_p
: 1;
170 struct ssa_operands ssa_operands
;
172 /* Hashtable of variables annotations. Used for static variables only;
173 local variables have direct pointer in the tree node. */
174 htab_t
GTY((param_is (struct static_var_ann_d
))) var_anns
;
176 /* Memory reference statistics collected during alias analysis.
177 This information is used to drive the memory partitioning
178 heuristics in compute_memory_partitions. */
179 struct mem_ref_stats_d mem_ref_stats
;
182 /* Accessors for internal use only. Generic code should use abstraction
183 provided by tree-flow-inline.h or specific modules. */
184 #define FREE_SSANAMES(fun) (fun)->gimple_df->free_ssanames
185 #define SSANAMES(fun) (fun)->gimple_df->ssa_names
186 #define MODIFIED_NORETURN_CALLS(fun) (fun)->gimple_df->modified_noreturn_calls
187 #define DEFAULT_DEFS(fun) (fun)->gimple_df->default_defs
196 /* Iterate through the elements of hashtable HTAB, using htab_iterator ITER,
197 storing each element in RESULT, which is of type TYPE. */
198 #define FOR_EACH_HTAB_ELEMENT(HTAB, RESULT, TYPE, ITER) \
199 for (RESULT = (TYPE) first_htab_element (&(ITER), (HTAB)); \
200 !end_htab_p (&(ITER)); \
201 RESULT = (TYPE) next_htab_element (&(ITER)))
203 /*---------------------------------------------------------------------------
204 Attributes for SSA_NAMEs.
206 NOTE: These structures are stored in struct tree_ssa_name
207 but are only used by the tree optimizers, so it makes better sense
208 to declare them here to avoid recompiling unrelated files when
210 ---------------------------------------------------------------------------*/
212 /* Aliasing information for SSA_NAMEs representing pointer variables. */
213 struct ptr_info_def
GTY(())
215 /* Nonzero if points-to analysis couldn't determine where this pointer
217 unsigned int pt_anything
: 1;
219 /* Nonzero if the value of this pointer escapes the current function. */
220 unsigned int value_escapes_p
: 1;
222 /* Nonzero if this pointer is dereferenced. */
223 unsigned int is_dereferenced
: 1;
225 /* Nonzero if this pointer points to a global variable. */
226 unsigned int pt_global_mem
: 1;
228 /* Nonzero if this pointer points to NULL. */
229 unsigned int pt_null
: 1;
231 /* Set of variables that this pointer may point to. */
234 /* If this pointer has been dereferenced, and points-to information is
235 more precise than type-based aliasing, indirect references to this
236 pointer will be represented by this memory tag, instead of the type
237 tag computed by TBAA. */
240 /* Mask of reasons this pointer's value escapes the function */
241 unsigned int escape_mask
;
245 /*---------------------------------------------------------------------------
246 Tree annotations stored in tree_base.ann
247 ---------------------------------------------------------------------------*/
248 enum tree_ann_type
{ TREE_ANN_COMMON
, VAR_ANN
, FUNCTION_ANN
, STMT_ANN
};
250 struct tree_ann_common_d
GTY(())
252 /* Annotation type. */
253 enum tree_ann_type type
;
255 /* Auxiliary info specific to a pass. At all times, this
256 should either point to valid data or be NULL. */
257 PTR
GTY ((skip (""))) aux
;
259 /* The value handle for this expression. Used by GVN-PRE. */
260 tree
GTY((skip
)) value_handle
;
263 /* It is advantageous to avoid things like life analysis for variables which
264 do not need PHI nodes. This enum describes whether or not a particular
265 variable may need a PHI node. */
267 enum need_phi_state
{
268 /* This is the default. If we are still in this state after finding
269 all the definition and use sites, then we will assume the variable
270 needs PHI nodes. This is probably an overly conservative assumption. */
271 NEED_PHI_STATE_UNKNOWN
,
273 /* This state indicates that we have seen one or more sets of the
274 variable in a single basic block and that the sets dominate all
275 uses seen so far. If after finding all definition and use sites
276 we are still in this state, then the variable does not need any
280 /* This state indicates that we have either seen multiple definitions of
281 the variable in multiple blocks, or that we encountered a use in a
282 block that was not dominated by the block containing the set(s) of
283 this variable. This variable is assumed to need PHI nodes. */
288 /* The "no alias" attribute allows alias analysis to make more
289 aggressive assumptions when assigning alias sets, computing
290 points-to information and memory partitions. These attributes
291 are the result of user annotations or flags (e.g.,
292 -fargument-noalias). */
294 /* Default state. No special assumptions can be made about this
298 /* The symbol does not alias with other symbols that have a
299 NO_ALIAS* attribute. */
302 /* The symbol does not alias with other symbols that have a
303 NO_ALIAS*, and it may not alias with global symbols. */
306 /* The symbol does not alias with any other symbols. */
312 typedef struct subvar
*subvar_t
;
314 /* This structure represents a fake sub-variable for a structure field. */
315 struct subvar
GTY(())
320 /* Next subvar for this structure. */
324 struct var_ann_d
GTY(())
326 struct tree_ann_common_d common
;
328 /* Used by the out of SSA pass to determine whether this variable has
329 been seen yet or not. */
330 unsigned out_of_ssa_tag
: 1;
332 /* Used when building base variable structures in a var_map. */
333 unsigned base_var_processed
: 1;
335 /* Nonzero if this variable was used after SSA optimizations were
336 applied. We set this when translating out of SSA form. */
339 /* This field indicates whether or not the variable may need PHI nodes.
340 See the enum's definition for more detailed information about the
342 ENUM_BITFIELD (need_phi_state
) need_phi_state
: 2;
344 /* Used during operand processing to determine if this variable is already
346 unsigned in_vuse_list
: 1;
348 /* Used during operand processing to determine if this variable is already
350 unsigned in_vdef_list
: 1;
352 /* True for HEAP artificial variables. These variables represent
353 the memory area allocated by a call to malloc. */
354 unsigned is_heapvar
: 1;
356 /* True if the variable is call clobbered. */
357 unsigned int call_clobbered
: 1;
359 /* This field describes several "no alias" attributes that some
360 symbols are known to have. See the enum's definition for more
361 information on each attribute. */
362 ENUM_BITFIELD (noalias_state
) noalias_state
: 2;
364 /* Memory partition tag assigned to this symbol. */
367 /* If this variable is a pointer P that has been dereferenced, this
368 field is an artificial variable that represents the memory
369 location *P. Every other pointer Q that is type-compatible with
370 P will also have the same memory tag. If the variable is not a
371 pointer or if it is never dereferenced, this must be NULL.
372 FIXME, do we really need this here? How much slower would it be
373 to convert to hash table? */
376 /* Used when going out of SSA form to indicate which partition this
377 variable represents storage for. */
380 /* Used by var_map for the base index of ssa base variables. */
383 /* During into-ssa and the dominator optimizer, this field holds the
384 current version of this variable (an SSA_NAME). */
387 /* If this variable is a structure, this fields holds a list of
388 symbols representing each of the fields of the structure. */
391 /* Mask of values saying the reasons why this variable has escaped
393 unsigned int escape_mask
;
396 /* Container for variable annotation used by hashtable for annotations for
398 struct static_var_ann_d
GTY(())
400 struct var_ann_d ann
;
404 struct function_ann_d
GTY(())
406 struct tree_ann_common_d common
;
408 /* Pointer to the structure that contains the sets of global
409 variables modified by function calls. This field is only used
410 for FUNCTION_DECLs. */
411 ipa_reference_vars_info_t
GTY ((skip
)) reference_vars_info
;
414 typedef struct immediate_use_iterator_d
416 /* This is the current use the iterator is processing. */
417 ssa_use_operand_t
*imm_use
;
418 /* This marks the last use in the list (use node from SSA_NAME) */
419 ssa_use_operand_t
*end_p
;
420 /* This node is inserted and used to mark the end of the uses for a stmt. */
421 ssa_use_operand_t iter_node
;
422 /* This is the next ssa_name to visit. IMM_USE may get removed before
423 the next one is traversed to, so it must be cached early. */
424 ssa_use_operand_t
*next_imm_name
;
428 /* Use this iterator when simply looking at stmts. Adding, deleting or
429 modifying stmts will cause this iterator to malfunction. */
431 #define FOR_EACH_IMM_USE_FAST(DEST, ITER, SSAVAR) \
432 for ((DEST) = first_readonly_imm_use (&(ITER), (SSAVAR)); \
433 !end_readonly_imm_use_p (&(ITER)); \
434 (DEST) = next_readonly_imm_use (&(ITER)))
436 /* Use this iterator to visit each stmt which has a use of SSAVAR. */
438 #define FOR_EACH_IMM_USE_STMT(STMT, ITER, SSAVAR) \
439 for ((STMT) = first_imm_use_stmt (&(ITER), (SSAVAR)); \
440 !end_imm_use_stmt_p (&(ITER)); \
441 (STMT) = next_imm_use_stmt (&(ITER)))
443 /* Use this to terminate the FOR_EACH_IMM_USE_STMT loop early. Failure to
444 do so will result in leaving a iterator marker node in the immediate
445 use list, and nothing good will come from that. */
446 #define BREAK_FROM_IMM_USE_STMT(ITER) \
448 end_imm_use_stmt_traverse (&(ITER)); \
453 /* Use this iterator in combination with FOR_EACH_IMM_USE_STMT to
454 get access to each occurrence of ssavar on the stmt returned by
455 that iterator.. for instance:
457 FOR_EACH_IMM_USE_STMT (stmt, iter, var)
459 FOR_EACH_IMM_USE_ON_STMT (use_p, iter)
461 SET_USE (use_p) = blah;
466 #define FOR_EACH_IMM_USE_ON_STMT(DEST, ITER) \
467 for ((DEST) = first_imm_use_on_stmt (&(ITER)); \
468 !end_imm_use_on_stmt_p (&(ITER)); \
469 (DEST) = next_imm_use_on_stmt (&(ITER)))
473 struct stmt_ann_d
GTY(())
475 struct tree_ann_common_d common
;
477 /* Basic block that contains this statement. */
480 /* Operand cache for stmt. */
481 struct stmt_operands_d
GTY ((skip (""))) operands
;
483 /* Set of variables that have had their address taken in the statement. */
484 bitmap addresses_taken
;
486 /* Unique identifier for this statement. These ID's are to be created
487 by each pass on an as-needed basis in any order convenient for the
488 pass which needs statement UIDs. */
491 /* Nonzero if the statement references memory (at least one of its
492 expressions contains a non-register operand). */
493 unsigned references_memory
: 1;
495 /* Nonzero if the statement has been modified (meaning that the operands
496 need to be scanned again). */
497 unsigned modified
: 1;
499 /* Nonzero if the statement makes references to volatile storage. */
500 unsigned has_volatile_ops
: 1;
503 union tree_ann_d
GTY((desc ("ann_type ((tree_ann_t)&%h)")))
505 struct tree_ann_common_d
GTY((tag ("TREE_ANN_COMMON"))) common
;
506 struct var_ann_d
GTY((tag ("VAR_ANN"))) vdecl
;
507 struct function_ann_d
GTY((tag ("FUNCTION_ANN"))) fdecl
;
508 struct stmt_ann_d
GTY((tag ("STMT_ANN"))) stmt
;
511 typedef union tree_ann_d
*tree_ann_t
;
512 typedef struct var_ann_d
*var_ann_t
;
513 typedef struct function_ann_d
*function_ann_t
;
514 typedef struct stmt_ann_d
*stmt_ann_t
;
515 typedef struct tree_ann_common_d
*tree_ann_common_t
;
517 static inline tree_ann_common_t
tree_common_ann (const_tree
);
518 static inline tree_ann_common_t
get_tree_common_ann (tree
);
519 static inline var_ann_t
var_ann (const_tree
);
520 static inline var_ann_t
get_var_ann (tree
);
521 static inline function_ann_t
function_ann (const_tree
);
522 static inline function_ann_t
get_function_ann (tree
);
523 static inline stmt_ann_t
stmt_ann (tree
);
524 static inline bool has_stmt_ann (tree
);
525 static inline stmt_ann_t
get_stmt_ann (tree
);
526 static inline enum tree_ann_type
ann_type (tree_ann_t
);
527 static inline basic_block
bb_for_stmt (tree
);
528 extern void set_bb_for_stmt (tree
, basic_block
);
529 static inline bool noreturn_call_p (tree
);
530 static inline void update_stmt (tree
);
531 static inline bool stmt_modified_p (tree
);
532 static inline bitmap
may_aliases (const_tree
);
533 static inline int get_lineno (const_tree
);
534 static inline bitmap
addresses_taken (tree
);
536 /*---------------------------------------------------------------------------
537 Structure representing predictions in tree level.
538 ---------------------------------------------------------------------------*/
539 struct edge_prediction
GTY((chain_next ("%h.ep_next")))
541 struct edge_prediction
*ep_next
;
543 enum br_predictor ep_predictor
;
547 /* Accessors for basic block annotations. */
548 static inline tree
phi_nodes (const_basic_block
);
549 static inline void set_phi_nodes (basic_block
, tree
);
551 /*---------------------------------------------------------------------------
553 ---------------------------------------------------------------------------*/
554 struct int_tree_map
GTY(())
561 extern unsigned int int_tree_map_hash (const void *);
562 extern int int_tree_map_eq (const void *, const void *);
567 } referenced_var_iterator
;
570 /* This macro loops over all the referenced vars, one at a time, putting the
571 current var in VAR. Note: You are not allowed to add referenced variables
572 to the hashtable while using this macro. Doing so may cause it to behave
575 #define FOR_EACH_REFERENCED_VAR(VAR, ITER) \
576 for ((VAR) = first_referenced_var (&(ITER)); \
577 !end_referenced_vars_p (&(ITER)); \
578 (VAR) = next_referenced_var (&(ITER)))
584 } safe_referenced_var_iterator
;
586 /* This macro loops over all the referenced vars, one at a time, putting the
587 current var in VAR. You are allowed to add referenced variables during the
588 execution of this macro, however, the macro will not iterate over them. It
589 requires a temporary vector of trees, VEC, whose lifetime is controlled by
590 the caller. The purpose of the vector is to temporarily store the
591 referenced_variables hashtable so that adding referenced variables does not
592 affect the hashtable. */
594 #define FOR_EACH_REFERENCED_VAR_SAFE(VAR, VEC, ITER) \
595 for ((ITER).i = 0, fill_referenced_var_vec (&(VEC)); \
596 VEC_iterate (tree, (VEC), (ITER).i, (VAR)); \
599 extern tree
referenced_var_lookup (unsigned int);
600 extern bool referenced_var_check_and_insert (tree
);
601 #define num_referenced_vars htab_elements (gimple_referenced_vars (cfun))
602 #define referenced_var(i) referenced_var_lookup (i)
604 #define num_ssa_names (VEC_length (tree, cfun->gimple_df->ssa_names))
605 #define ssa_name(i) (VEC_index (tree, cfun->gimple_df->ssa_names, (i)))
607 /* Macros for showing usage statistics. */
608 #define SCALE(x) ((unsigned long) ((x) < 1024*10 \
610 : ((x) < 1024*1024*10 \
612 : (x) / (1024*1024))))
614 #define LABEL(x) ((x) < 1024*10 ? 'b' : ((x) < 1024*1024*10 ? 'k' : 'M'))
616 #define PERCENT(x,y) ((float)(x) * 100.0 / (float)(y))
618 /*---------------------------------------------------------------------------
620 ---------------------------------------------------------------------------*/
623 tree_stmt_iterator tsi
;
625 } block_stmt_iterator
;
628 const_tree_stmt_iterator tsi
;
629 const_basic_block bb
;
630 } const_block_stmt_iterator
;
632 static inline block_stmt_iterator
bsi_start (basic_block
);
633 static inline const_block_stmt_iterator
cbsi_start (const_basic_block
);
634 static inline block_stmt_iterator
bsi_last (basic_block
);
635 static inline const_block_stmt_iterator
cbsi_last (const_basic_block
);
636 static inline block_stmt_iterator
bsi_after_labels (basic_block
);
637 block_stmt_iterator
bsi_for_stmt (tree
);
638 static inline bool bsi_end_p (block_stmt_iterator
);
639 static inline void bsi_next (block_stmt_iterator
*);
640 static inline void bsi_prev (block_stmt_iterator
*);
641 static inline tree
bsi_stmt (block_stmt_iterator
);
642 static inline tree
* bsi_stmt_ptr (block_stmt_iterator
);
644 extern void bsi_remove (block_stmt_iterator
*, bool);
645 extern void bsi_move_before (block_stmt_iterator
*, block_stmt_iterator
*);
646 extern void bsi_move_after (block_stmt_iterator
*, block_stmt_iterator
*);
647 extern void bsi_move_to_bb_end (block_stmt_iterator
*, basic_block
);
649 enum bsi_iterator_update
651 /* Note that these are intentionally in the same order as TSI_FOO. They
652 mean exactly the same as their TSI_* counterparts. */
660 extern void bsi_insert_before (block_stmt_iterator
*, tree
,
661 enum bsi_iterator_update
);
662 extern void bsi_insert_after (block_stmt_iterator
*, tree
,
663 enum bsi_iterator_update
);
665 extern void bsi_replace (const block_stmt_iterator
*, tree
, bool);
667 /*---------------------------------------------------------------------------
669 ---------------------------------------------------------------------------*/
671 /* Parallel region information. Every parallel and workshare
672 directive is enclosed between two markers, the OMP_* directive
673 and a corresponding OMP_RETURN statement. */
677 /* The enclosing region. */
678 struct omp_region
*outer
;
680 /* First child region. */
681 struct omp_region
*inner
;
683 /* Next peer region. */
684 struct omp_region
*next
;
686 /* Block containing the omp directive as its last stmt. */
689 /* Block containing the OMP_RETURN as its last stmt. */
692 /* Block containing the OMP_CONTINUE as its last stmt. */
695 /* If this is a combined parallel+workshare region, this is a list
696 of additional arguments needed by the combined parallel+workshare
700 /* The code for the omp directive of this region. */
703 /* Schedule kind, only used for OMP_FOR type regions. */
704 enum omp_clause_schedule_kind sched_kind
;
706 /* True if this is a combined parallel+workshare region. */
707 bool is_combined_parallel
;
710 extern struct omp_region
*root_omp_region
;
711 extern struct omp_region
*new_omp_region (basic_block
, enum tree_code
,
712 struct omp_region
*);
713 extern void free_omp_regions (void);
715 /*---------------------------------------------------------------------------
717 ---------------------------------------------------------------------------*/
720 /* Location to track pending stmt for edge insertion. */
721 #define PENDING_STMT(e) ((e)->insns.t)
723 extern void delete_tree_cfg_annotations (void);
724 extern bool stmt_ends_bb_p (const_tree
);
725 extern bool is_ctrl_stmt (const_tree
);
726 extern bool is_ctrl_altering_stmt (const_tree
);
727 extern bool computed_goto_p (const_tree
);
728 extern bool simple_goto_p (const_tree
);
729 extern bool tree_can_make_abnormal_goto (const_tree
);
730 extern basic_block
single_noncomplex_succ (basic_block bb
);
731 extern void tree_dump_bb (basic_block
, FILE *, int);
732 extern void debug_tree_bb (basic_block
);
733 extern basic_block
debug_tree_bb_n (int);
734 extern void dump_tree_cfg (FILE *, int);
735 extern void debug_tree_cfg (int);
736 extern void dump_cfg_stats (FILE *);
737 extern void debug_cfg_stats (void);
738 extern void debug_loop_ir (void);
739 extern void print_loop_ir (FILE *);
740 extern void cleanup_dead_labels (void);
741 extern void group_case_labels (void);
742 extern tree
first_stmt (basic_block
);
743 extern tree
last_stmt (basic_block
);
744 extern tree
last_and_only_stmt (basic_block
);
745 extern edge
find_taken_edge (basic_block
, tree
);
746 extern basic_block
label_to_block_fn (struct function
*, tree
);
747 #define label_to_block(t) (label_to_block_fn (cfun, t))
748 extern void bsi_insert_on_edge (edge
, tree
);
749 extern basic_block
bsi_insert_on_edge_immediate (edge
, tree
);
750 extern void bsi_commit_one_edge_insert (edge
, basic_block
*);
751 extern void bsi_commit_edge_inserts (void);
752 extern void notice_special_calls (tree
);
753 extern void clear_special_calls (void);
754 extern void verify_stmts (void);
755 extern void verify_gimple (void);
756 extern void verify_gimple_1 (tree
);
757 extern tree
tree_block_label (basic_block
);
758 extern void extract_true_false_edges_from_block (basic_block
, edge
*, edge
*);
759 extern bool tree_duplicate_sese_region (edge
, edge
, basic_block
*, unsigned,
761 extern void add_phi_args_after_copy_bb (basic_block
);
762 extern void add_phi_args_after_copy (basic_block
*, unsigned);
763 extern bool tree_purge_dead_abnormal_call_edges (basic_block
);
764 extern bool tree_purge_dead_eh_edges (basic_block
);
765 extern bool tree_purge_all_dead_eh_edges (const_bitmap
);
766 extern tree
gimplify_val (block_stmt_iterator
*, tree
, tree
);
767 extern tree
gimplify_build1 (block_stmt_iterator
*, enum tree_code
,
769 extern tree
gimplify_build2 (block_stmt_iterator
*, enum tree_code
,
771 extern tree
gimplify_build3 (block_stmt_iterator
*, enum tree_code
,
772 tree
, tree
, tree
, tree
);
773 extern void init_empty_tree_cfg (void);
774 extern void fold_cond_expr_cond (void);
775 extern void make_abnormal_goto_edges (basic_block
, bool);
776 extern void replace_uses_by (tree
, tree
);
777 extern void start_recording_case_labels (void);
778 extern void end_recording_case_labels (void);
779 extern basic_block
move_sese_region_to_fn (struct function
*, basic_block
,
781 void remove_edge_and_dominated_blocks (edge
);
783 /* In tree-cfgcleanup.c */
784 extern bitmap cfgcleanup_altered_bbs
;
785 extern bool cleanup_tree_cfg (void);
787 /* In tree-pretty-print.c. */
788 extern void dump_generic_bb (FILE *, basic_block
, int, int);
789 extern const char *op_symbol_code (enum tree_code
);
792 extern var_ann_t
create_var_ann (tree
);
793 extern function_ann_t
create_function_ann (tree
);
794 extern stmt_ann_t
create_stmt_ann (tree
);
795 extern tree_ann_common_t
create_tree_common_ann (tree
);
796 extern void dump_dfa_stats (FILE *);
797 extern void debug_dfa_stats (void);
798 extern void debug_referenced_vars (void);
799 extern void dump_referenced_vars (FILE *);
800 extern void dump_variable (FILE *, tree
);
801 extern void debug_variable (tree
);
802 extern void dump_subvars_for (FILE *, tree
);
803 extern void debug_subvars_for (tree
);
804 extern tree
get_virtual_var (tree
);
805 extern void add_referenced_var (tree
);
806 extern void remove_referenced_var (tree
);
807 extern void mark_symbols_for_renaming (tree
);
808 extern void find_new_referenced_vars (tree
*);
809 extern tree
make_rename_temp (tree
, const char *);
810 extern void set_default_def (tree
, tree
);
811 extern tree
gimple_default_def (struct function
*, tree
);
812 extern struct mem_sym_stats_d
*mem_sym_stats (struct function
*, tree
);
814 /* In tree-phinodes.c */
815 extern void reserve_phi_args_for_new_edge (basic_block
);
816 extern tree
create_phi_node (tree
, basic_block
);
817 extern void add_phi_arg (tree
, tree
, edge
);
818 extern void remove_phi_args (edge
);
819 extern void remove_phi_node (tree
, tree
, bool);
820 extern tree
phi_reverse (tree
);
822 /* In gimple-low.c */
823 extern void record_vars_into (tree
, tree
);
824 extern void record_vars (tree
);
825 extern bool block_may_fallthru (const_tree
);
827 /* In tree-ssa-alias.c */
828 extern unsigned int compute_may_aliases (void);
829 extern void dump_may_aliases_for (FILE *, tree
);
830 extern void debug_may_aliases_for (tree
);
831 extern void dump_alias_info (FILE *);
832 extern void debug_alias_info (void);
833 extern void dump_points_to_info (FILE *);
834 extern void debug_points_to_info (void);
835 extern void dump_points_to_info_for (FILE *, tree
);
836 extern void debug_points_to_info_for (tree
);
837 extern bool may_be_aliased (tree
);
838 extern struct ptr_info_def
*get_ptr_info (tree
);
839 extern void new_type_alias (tree
, tree
, tree
);
840 extern void count_uses_and_derefs (tree
, tree
, unsigned *, unsigned *,
842 static inline subvar_t
get_subvars_for_var (tree
);
843 static inline tree
get_subvar_at (tree
, unsigned HOST_WIDE_INT
);
844 static inline bool ref_contains_array_ref (const_tree
);
845 static inline bool array_ref_contains_indirect_ref (const_tree
);
846 extern tree
get_ref_base_and_extent (tree
, HOST_WIDE_INT
*,
847 HOST_WIDE_INT
*, HOST_WIDE_INT
*);
848 static inline bool var_can_have_subvars (const_tree
);
849 static inline bool overlap_subvar (unsigned HOST_WIDE_INT
,
850 unsigned HOST_WIDE_INT
,
852 extern tree
create_tag_raw (enum tree_code
, tree
, const char *);
853 extern void delete_mem_ref_stats (struct function
*);
854 extern void dump_mem_ref_stats (FILE *);
855 extern void debug_mem_ref_stats (void);
856 extern void debug_memory_partitions (void);
857 extern void debug_mem_sym_stats (tree var
);
858 extern void debug_all_mem_sym_stats (void);
860 /* Call-back function for walk_use_def_chains(). At each reaching
861 definition, a function with this prototype is called. */
862 typedef bool (*walk_use_def_chains_fn
) (tree
, tree
, void *);
864 /* In tree-ssa-alias-warnings.c */
865 extern void strict_aliasing_warning_backend (void);
868 extern void init_tree_ssa (void);
869 extern edge
ssa_redirect_edge (edge
, basic_block
);
870 extern void flush_pending_stmts (edge
);
871 extern bool tree_ssa_useless_type_conversion (tree
);
872 extern bool useless_type_conversion_p (tree
, tree
);
873 extern bool types_compatible_p (tree
, tree
);
874 extern void verify_ssa (bool);
875 extern void delete_tree_ssa (void);
876 extern void walk_use_def_chains (tree
, walk_use_def_chains_fn
, void *, bool);
877 extern bool stmt_references_memory_p (tree
);
879 /* In tree-into-ssa.c */
880 void update_ssa (unsigned);
881 void delete_update_ssa (void);
882 void register_new_name_mapping (tree
, tree
);
883 tree
create_new_def_for (tree
, tree
, def_operand_p
);
884 bool need_ssa_update_p (void);
885 bool name_mappings_registered_p (void);
886 bool name_registered_for_update_p (tree
);
887 bitmap
ssa_names_to_replace (void);
888 void release_ssa_name_after_update_ssa (tree
);
889 void compute_global_livein (bitmap
, bitmap
);
890 tree
duplicate_ssa_name (tree
, tree
);
891 void mark_sym_for_renaming (tree
);
892 void mark_set_for_renaming (bitmap
);
893 tree
get_current_def (tree
);
894 void set_current_def (tree
, tree
);
896 /* In tree-ssa-ccp.c */
897 bool fold_stmt (tree
*);
898 bool fold_stmt_inplace (tree
);
899 tree
widen_bitfield (tree
, tree
, tree
);
902 tree
vrp_evaluate_conditional (tree
, tree
);
903 void simplify_stmt_using_ranges (tree
);
905 /* In tree-ssa-dom.c */
906 extern void dump_dominator_optimization_stats (FILE *);
907 extern void debug_dominator_optimization_stats (void);
908 int loop_depth_of_name (tree
);
910 /* In tree-ssa-copy.c */
911 extern void merge_alias_info (tree
, tree
);
912 extern void propagate_value (use_operand_p
, tree
);
913 extern void propagate_tree_value (tree
*, tree
);
914 extern void replace_exp (use_operand_p
, tree
);
915 extern bool may_propagate_copy (tree
, tree
);
916 extern bool may_propagate_copy_into_asm (tree
);
922 /* Iv = BASE + STEP * i. */
925 /* True if this iv does not overflow. */
929 /* Description of number of iterations of a loop. All the expressions inside
930 the structure can be evaluated at the end of the loop's preheader
931 (and due to ssa form, also anywhere inside the body of the loop). */
933 struct tree_niter_desc
935 tree assumptions
; /* The boolean expression. If this expression evaluates
936 to false, then the other fields in this structure
937 should not be used; there is no guarantee that they
939 tree may_be_zero
; /* The boolean expression. If it evaluates to true,
940 the loop will exit in the first iteration (i.e.
941 its latch will not be executed), even if the niter
942 field says otherwise. */
943 tree niter
; /* The expression giving the number of iterations of
944 a loop (provided that assumptions == true and
945 may_be_zero == false), more precisely the number
946 of executions of the latch of the loop. */
947 double_int max
; /* The upper bound on the number of iterations of
950 /* The simplified shape of the exit condition. The loop exits if
951 CONTROL CMP BOUND is false, where CMP is one of NE_EXPR,
952 LT_EXPR, or GT_EXPR, and step of CONTROL is positive if CMP is
953 LE_EXPR and negative if CMP is GE_EXPR. This information is used
954 by loop unrolling. */
960 /* In tree-vectorizer.c */
961 unsigned vectorize_loops (void);
962 extern bool vect_can_force_dr_alignment_p (const_tree
, unsigned int);
963 extern tree
get_vectype_for_scalar_type (tree
);
965 /* In tree-ssa-phiopt.c */
966 bool empty_block_p (const_basic_block
);
967 basic_block
*blocks_in_phiopt_order (void);
969 /* In tree-ssa-loop*.c */
971 void tree_ssa_lim (void);
972 unsigned int tree_ssa_unswitch_loops (void);
973 unsigned int canonicalize_induction_variables (void);
974 unsigned int tree_unroll_loops_completely (bool);
975 unsigned int tree_ssa_prefetch_arrays (void);
976 unsigned int remove_empty_loops (void);
977 void tree_ssa_iv_optimize (void);
978 unsigned tree_predictive_commoning (void);
980 bool number_of_iterations_exit (struct loop
*, edge
,
981 struct tree_niter_desc
*niter
, bool);
982 tree
find_loop_niter (struct loop
*, edge
*);
983 tree
loop_niter_by_eval (struct loop
*, edge
);
984 tree
find_loop_niter_by_eval (struct loop
*, edge
*);
985 void estimate_numbers_of_iterations (void);
986 bool scev_probably_wraps_p (tree
, tree
, tree
, struct loop
*, bool);
987 bool convert_affine_scev (struct loop
*, tree
, tree
*, tree
*, tree
, bool);
989 bool nowrap_type_p (tree
);
990 enum ev_direction
{EV_DIR_GROWS
, EV_DIR_DECREASES
, EV_DIR_UNKNOWN
};
991 enum ev_direction
scev_direction (const_tree
);
993 void free_numbers_of_iterations_estimates (void);
994 void free_numbers_of_iterations_estimates_loop (struct loop
*);
995 void rewrite_into_loop_closed_ssa (bitmap
, unsigned);
996 void verify_loop_closed_ssa (void);
997 bool for_each_index (tree
*, bool (*) (tree
, tree
*, void *), void *);
998 void create_iv (tree
, tree
, tree
, struct loop
*, block_stmt_iterator
*, bool,
1000 void split_loop_exit_edge (edge
);
1001 unsigned force_expr_to_var_cost (tree
);
1002 void standard_iv_increment_position (struct loop
*, block_stmt_iterator
*,
1004 basic_block
ip_end_pos (struct loop
*);
1005 basic_block
ip_normal_pos (struct loop
*);
1006 bool tree_duplicate_loop_to_header_edge (struct loop
*, edge
,
1007 unsigned int, sbitmap
,
1008 edge
, VEC (edge
, heap
) **,
1010 struct loop
*tree_ssa_loop_version (struct loop
*, tree
,
1012 tree
expand_simple_operations (tree
);
1013 void substitute_in_loop_info (struct loop
*, tree
, tree
);
1014 edge
single_dom_exit (struct loop
*);
1015 bool can_unroll_loop_p (struct loop
*loop
, unsigned factor
,
1016 struct tree_niter_desc
*niter
);
1017 void tree_unroll_loop (struct loop
*, unsigned,
1018 edge
, struct tree_niter_desc
*);
1019 typedef void (*transform_callback
)(struct loop
*, void *);
1020 void tree_transform_and_unroll_loop (struct loop
*, unsigned,
1021 edge
, struct tree_niter_desc
*,
1022 transform_callback
, void *);
1023 bool contains_abnormal_ssa_name_p (tree
);
1024 bool stmt_dominates_stmt_p (tree
, tree
);
1025 void mark_virtual_ops_for_renaming (tree
);
1027 /* In tree-ssa-threadedge.c */
1028 extern bool potentially_threadable_block (basic_block
);
1029 extern void thread_across_edge (tree
, edge
, bool,
1030 VEC(tree
, heap
) **, tree (*) (tree
, tree
));
1032 /* In tree-ssa-loop-im.c */
1033 /* The possibilities of statement movement. */
1037 MOVE_IMPOSSIBLE
, /* No movement -- side effect expression. */
1038 MOVE_PRESERVE_EXECUTION
, /* Must not cause the non-executed statement
1039 become executed -- memory accesses, ... */
1040 MOVE_POSSIBLE
/* Unlimited movement. */
1042 extern enum move_pos
movement_possibility (tree
);
1043 char *get_lsm_tmp_name (tree
, unsigned);
1045 /* The reasons a variable may escape a function. */
1048 NO_ESCAPE
= 0, /* Doesn't escape. */
1049 ESCAPE_STORED_IN_GLOBAL
= 1 << 1,
1050 ESCAPE_TO_ASM
= 1 << 2, /* Passed by address to an assembly
1052 ESCAPE_TO_CALL
= 1 << 3, /* Escapes to a function call. */
1053 ESCAPE_BAD_CAST
= 1 << 4, /* Cast from pointer to integer */
1054 ESCAPE_TO_RETURN
= 1 << 5, /* Returned from function. */
1055 ESCAPE_TO_PURE_CONST
= 1 << 6, /* Escapes to a pure or constant
1057 ESCAPE_IS_GLOBAL
= 1 << 7, /* Is a global variable. */
1058 ESCAPE_IS_PARM
= 1 << 8, /* Is an incoming function argument. */
1059 ESCAPE_UNKNOWN
= 1 << 9 /* We believe it escapes for
1060 some reason not enumerated
1064 /* In tree-flow-inline.h */
1065 static inline bool is_call_clobbered (const_tree
);
1066 static inline void mark_call_clobbered (tree
, unsigned int);
1067 static inline void set_is_used (tree
);
1068 static inline bool unmodifiable_var_p (const_tree
);
1071 extern void make_eh_edges (tree
);
1072 extern bool tree_could_trap_p (tree
);
1073 extern bool tree_could_throw_p (tree
);
1074 extern bool tree_can_throw_internal (const_tree
);
1075 extern bool tree_can_throw_external (tree
);
1076 extern int lookup_stmt_eh_region (const_tree
);
1077 extern void add_stmt_to_eh_region (tree
, int);
1078 extern bool remove_stmt_from_eh_region (tree
);
1079 extern bool maybe_clean_or_replace_eh_stmt (tree
, tree
);
1081 /* In tree-ssa-pre.c */
1082 void add_to_value (tree
, tree
);
1083 void debug_value_expressions (tree
);
1084 void print_value_expressions (FILE *, tree
);
1088 tree
make_value_handle (tree
);
1089 void set_value_handle (tree
, tree
);
1090 bool expressions_equal_p (tree
, tree
);
1091 static inline tree
get_value_handle (tree
);
1092 void sort_vuses (VEC (tree
, gc
) *);
1093 void sort_vuses_heap (VEC (tree
, heap
) *);
1094 tree
vn_lookup_or_add (tree
);
1095 tree
vn_lookup_or_add_with_stmt (tree
, tree
);
1096 tree
vn_lookup_or_add_with_vuses (tree
, VEC (tree
, gc
) *);
1097 void vn_add (tree
, tree
);
1098 void vn_add_with_vuses (tree
, tree
, VEC (tree
, gc
) *);
1099 tree
vn_lookup_with_stmt (tree
, tree
);
1100 tree
vn_lookup (tree
);
1101 tree
vn_lookup_with_vuses (tree
, VEC (tree
, gc
) *);
1103 /* In tree-ssa-sink.c */
1104 bool is_hidden_global_store (tree
);
1107 void insert_edge_copies (tree
, basic_block
);
1108 void sra_insert_before (block_stmt_iterator
*, tree
);
1109 void sra_insert_after (block_stmt_iterator
*, tree
);
1110 void sra_init_cache (void);
1111 bool sra_type_can_be_decomposed_p (tree
);
1113 /* In tree-loop-linear.c */
1114 extern void linear_transform_loops (void);
1116 /* In tree-data-ref.c */
1117 extern void tree_check_data_deps (void);
1119 /* In tree-ssa-loop-ivopts.c */
1120 bool expr_invariant_in_loop_p (struct loop
*, tree
);
1121 bool multiplier_allowed_in_address_p (HOST_WIDE_INT
, enum machine_mode
);
1122 unsigned multiply_by_cost (HOST_WIDE_INT
, enum machine_mode
);
1124 /* In tree-ssa-threadupdate.c. */
1125 extern bool thread_through_all_blocks (bool);
1126 extern void register_jump_thread (edge
, edge
);
1129 tree
force_gimple_operand (tree
, tree
*, bool, tree
);
1130 tree
force_gimple_operand_bsi (block_stmt_iterator
*, tree
, bool, tree
,
1131 bool, enum bsi_iterator_update
);
1133 /* In tree-ssa-structalias.c */
1134 bool find_what_p_points_to (tree
);
1136 /* In tree-ssa-live.c */
1137 extern void remove_unused_locals (void);
1139 /* In tree-ssa-address.c */
1141 /* Description of a memory address. */
1145 tree symbol
, base
, index
, step
, offset
;
1148 struct affine_tree_combination
;
1149 tree
create_mem_ref (block_stmt_iterator
*, tree
,
1150 struct affine_tree_combination
*);
1151 rtx
addr_for_mem_ref (struct mem_address
*, bool);
1152 void get_address_description (tree
, struct mem_address
*);
1153 tree
maybe_fold_tmr (tree
);
1155 /* This structure is simply used during pushing fields onto the fieldstack
1156 to track the offset of the field, since bitpos_of_field gives it relative
1157 to its immediate containing type, and we want it relative to the ultimate
1158 containing object. */
1165 HOST_WIDE_INT offset
;
1166 alias_set_type alias_set
;
1168 typedef struct fieldoff fieldoff_s
;
1170 DEF_VEC_O(fieldoff_s
);
1171 DEF_VEC_ALLOC_O(fieldoff_s
,heap
);
1172 int push_fields_onto_fieldstack (tree
, VEC(fieldoff_s
,heap
) **,
1173 HOST_WIDE_INT
, bool *, tree
);
1174 void sort_fieldstack (VEC(fieldoff_s
,heap
) *);
1176 void init_alias_heapvars (void);
1177 void delete_alias_heapvars (void);
1178 unsigned int execute_fixup_cfg (void);
1180 #include "tree-flow-inline.h"
1182 void swap_tree_operands (tree
, tree
*, tree
*);
1184 int least_common_multiple (int, int);
1186 #endif /* _TREE_FLOW_H */