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 /* The reasons a variable may escape a function. */
46 NO_ESCAPE
= 0, /* Doesn't escape. */
47 ESCAPE_STORED_IN_GLOBAL
= 1 << 0,
48 ESCAPE_TO_ASM
= 1 << 1, /* Passed by address to an assembly
50 ESCAPE_TO_CALL
= 1 << 2, /* Escapes to a function call. */
51 ESCAPE_BAD_CAST
= 1 << 3, /* Cast from pointer to integer */
52 ESCAPE_TO_RETURN
= 1 << 4, /* Returned from function. */
53 ESCAPE_TO_PURE_CONST
= 1 << 5, /* Escapes to a pure or constant
55 ESCAPE_IS_GLOBAL
= 1 << 6, /* Is a global variable. */
56 ESCAPE_IS_PARM
= 1 << 7, /* Is an incoming function argument. */
57 ESCAPE_UNKNOWN
= 1 << 8 /* We believe it escapes for
58 some reason not enumerated
62 /* Memory reference statistics for individual memory symbols,
63 collected during alias analysis. */
64 struct mem_sym_stats_d
GTY(())
69 /* Nonzero if this entry has been assigned a partition. */
70 unsigned int partitioned_p
: 1;
72 /* Nonzero if VAR is a memory partition tag that already contains
73 call-clobbered variables in its partition set. */
74 unsigned int has_call_clobbered_vars
: 1;
76 /* Number of direct reference sites. A direct reference to VAR is any
77 reference of the form 'VAR = ' or ' = VAR'. For GIMPLE reg
78 pointers, this is the number of sites where the pointer is
80 long num_direct_writes
;
81 long num_direct_reads
;
83 /* Number of indirect reference sites. An indirect reference to VAR
84 is any reference via a pointer that contains VAR in its points-to
85 set or, in the case of call-clobbered symbols, a function call. */
86 long num_indirect_writes
;
87 long num_indirect_reads
;
89 /* Execution frequency. This is the sum of the execution
90 frequencies of all the statements that reference this object
91 weighted by the number of references in each statement. This is
92 the main key used to sort the list of symbols to partition.
93 Symbols with high execution frequencies are put at the bottom of
94 the work list (ie, they are partitioned last).
95 Execution frequencies are taken directly from each basic block,
96 so compiling with PGO enabled will increase the precision of this
99 long frequency_writes
;
101 /* Set of memory tags that contain VAR in their alias set. */
105 typedef struct mem_sym_stats_d
*mem_sym_stats_t
;
106 DEF_VEC_P(mem_sym_stats_t
);
107 DEF_VEC_ALLOC_P(mem_sym_stats_t
, heap
);
109 /* Memory reference statistics collected during alias analysis. */
110 struct mem_ref_stats_d
GTY(())
112 /* Number of statements that make memory references. */
115 /* Number of statements that make function calls. */
118 /* Number of statements that make calls to pure/const functions. */
119 long num_pure_const_call_sites
;
121 /* Number of ASM statements. */
124 /* Estimated number of virtual operands needed as computed by
125 compute_memory_partitions. */
129 /* This maps every symbol used to make "memory" references
130 (pointers, arrays, structures, etc) to an instance of struct
131 mem_sym_stats_d describing reference statistics for the symbol. */
132 struct pointer_map_t
* GTY((skip
)) mem_sym_stats
;
136 /* Gimple dataflow datastructure. All publicly available fields shall have
137 gimple_ accessor defined in tree-flow-inline.h, all publicly modifiable
138 fields should have gimple_set accessor. */
139 struct gimple_df
GTY(())
141 /* Array of all variables referenced in the function. */
142 htab_t
GTY((param_is (union tree_node
))) referenced_vars
;
144 /* A list of all the noreturn calls passed to modify_stmt.
145 cleanup_control_flow uses it to detect cases where a mid-block
146 indirect call has been turned into a noreturn call. When this
147 happens, all the instructions after the call are no longer
148 reachable and must be deleted as dead. */
149 VEC(tree
,gc
) *modified_noreturn_calls
;
151 /* Array of all SSA_NAMEs used in the function. */
152 VEC(tree
,gc
) *ssa_names
;
154 /* Artificial variable used to model the effects of function calls. */
157 /* Artificial variable used to model the effects of nonlocal
161 /* Call clobbered variables in the function. If bit I is set, then
162 REFERENCED_VARS (I) is call-clobbered. */
163 bitmap call_clobbered_vars
;
165 /* Addressable variables in the function. If bit I is set, then
166 REFERENCED_VARS (I) has had its address taken. Note that
167 CALL_CLOBBERED_VARS and ADDRESSABLE_VARS are not related. An
168 addressable variable is not necessarily call-clobbered (e.g., a
169 local addressable whose address does not escape) and not all
170 call-clobbered variables are addressable (e.g., a local static
172 bitmap addressable_vars
;
174 /* Free list of SSA_NAMEs. */
177 /* Hashtable holding definition for symbol. If this field is not NULL, it
178 means that the first reference to this variable in the function is a
179 USE or a VUSE. In those cases, the SSA renamer creates an SSA name
180 for this variable with an empty defining statement. */
181 htab_t
GTY((param_is (union tree_node
))) default_defs
;
183 /* 'true' after aliases have been computed (see compute_may_aliases). */
184 unsigned int aliases_computed_p
: 1;
186 /* True if the code is in ssa form. */
187 unsigned int in_ssa_p
: 1;
189 struct ssa_operands ssa_operands
;
191 /* Hashtable of variables annotations. Used for static variables only;
192 local variables have direct pointer in the tree node. */
193 htab_t
GTY((param_is (struct static_var_ann_d
))) var_anns
;
195 /* Memory reference statistics collected during alias analysis.
196 This information is used to drive the memory partitioning
197 heuristics in compute_memory_partitions. */
198 struct mem_ref_stats_d mem_ref_stats
;
201 /* Accessors for internal use only. Generic code should use abstraction
202 provided by tree-flow-inline.h or specific modules. */
203 #define FREE_SSANAMES(fun) (fun)->gimple_df->free_ssanames
204 #define SSANAMES(fun) (fun)->gimple_df->ssa_names
205 #define MODIFIED_NORETURN_CALLS(fun) (fun)->gimple_df->modified_noreturn_calls
206 #define DEFAULT_DEFS(fun) (fun)->gimple_df->default_defs
215 /* Iterate through the elements of hashtable HTAB, using htab_iterator ITER,
216 storing each element in RESULT, which is of type TYPE. */
217 #define FOR_EACH_HTAB_ELEMENT(HTAB, RESULT, TYPE, ITER) \
218 for (RESULT = (TYPE) first_htab_element (&(ITER), (HTAB)); \
219 !end_htab_p (&(ITER)); \
220 RESULT = (TYPE) next_htab_element (&(ITER)))
222 /*---------------------------------------------------------------------------
223 Attributes for SSA_NAMEs.
225 NOTE: These structures are stored in struct tree_ssa_name
226 but are only used by the tree optimizers, so it makes better sense
227 to declare them here to avoid recompiling unrelated files when
229 ---------------------------------------------------------------------------*/
231 /* Aliasing information for SSA_NAMEs representing pointer variables. */
232 struct ptr_info_def
GTY(())
234 /* Nonzero if points-to analysis couldn't determine where this pointer
236 unsigned int pt_anything
: 1;
238 /* Nonzero if the value of this pointer escapes the current function. */
239 unsigned int value_escapes_p
: 1;
241 /* Nonzero if this pointer is dereferenced. */
242 unsigned int is_dereferenced
: 1;
244 /* Nonzero if this pointer points to a global variable. */
245 unsigned int pt_global_mem
: 1;
247 /* Nonzero if this pointer points to NULL. */
248 unsigned int pt_null
: 1;
250 /* Mask of reasons this pointer's value escapes the function */
251 ENUM_BITFIELD (escape_type
) escape_mask
: 9;
253 /* Set of variables that this pointer may point to. */
256 /* If this pointer has been dereferenced, and points-to information is
257 more precise than type-based aliasing, indirect references to this
258 pointer will be represented by this memory tag, instead of the type
259 tag computed by TBAA. */
264 /*---------------------------------------------------------------------------
265 Tree annotations stored in tree_base.ann
266 ---------------------------------------------------------------------------*/
267 enum tree_ann_type
{ TREE_ANN_COMMON
, VAR_ANN
, FUNCTION_ANN
, STMT_ANN
};
269 struct tree_ann_common_d
GTY(())
271 /* Annotation type. */
272 enum tree_ann_type type
;
274 /* Auxiliary info specific to a pass. At all times, this
275 should either point to valid data or be NULL. */
276 PTR
GTY ((skip (""))) aux
;
278 /* The value handle for this expression. Used by GVN-PRE. */
279 tree
GTY((skip
)) value_handle
;
282 /* It is advantageous to avoid things like life analysis for variables which
283 do not need PHI nodes. This enum describes whether or not a particular
284 variable may need a PHI node. */
286 enum need_phi_state
{
287 /* This is the default. If we are still in this state after finding
288 all the definition and use sites, then we will assume the variable
289 needs PHI nodes. This is probably an overly conservative assumption. */
290 NEED_PHI_STATE_UNKNOWN
,
292 /* This state indicates that we have seen one or more sets of the
293 variable in a single basic block and that the sets dominate all
294 uses seen so far. If after finding all definition and use sites
295 we are still in this state, then the variable does not need any
299 /* This state indicates that we have either seen multiple definitions of
300 the variable in multiple blocks, or that we encountered a use in a
301 block that was not dominated by the block containing the set(s) of
302 this variable. This variable is assumed to need PHI nodes. */
307 /* The "no alias" attribute allows alias analysis to make more
308 aggressive assumptions when assigning alias sets, computing
309 points-to information and memory partitions. These attributes
310 are the result of user annotations or flags (e.g.,
311 -fargument-noalias). */
313 /* Default state. No special assumptions can be made about this
317 /* The symbol does not alias with other symbols that have a
318 NO_ALIAS* attribute. */
321 /* The symbol does not alias with other symbols that have a
322 NO_ALIAS*, and it may not alias with global symbols. */
325 /* The symbol does not alias with any other symbols. */
330 typedef VEC(tree
,gc
) *subvar_t
;
332 struct var_ann_d
GTY(())
334 struct tree_ann_common_d common
;
336 /* Used by the out of SSA pass to determine whether this variable has
337 been seen yet or not. */
338 unsigned out_of_ssa_tag
: 1;
340 /* Used when building base variable structures in a var_map. */
341 unsigned base_var_processed
: 1;
343 /* Nonzero if this variable was used after SSA optimizations were
344 applied. We set this when translating out of SSA form. */
347 /* This field indicates whether or not the variable may need PHI nodes.
348 See the enum's definition for more detailed information about the
350 ENUM_BITFIELD (need_phi_state
) need_phi_state
: 2;
352 /* Used during operand processing to determine if this variable is already
354 unsigned in_vuse_list
: 1;
356 /* Used during operand processing to determine if this variable is already
358 unsigned in_vdef_list
: 1;
360 /* True for HEAP artificial variables. These variables represent
361 the memory area allocated by a call to malloc. */
362 unsigned is_heapvar
: 1;
364 /* True if the variable is call clobbered. */
365 unsigned call_clobbered
: 1;
367 /* This field describes several "no alias" attributes that some
368 symbols are known to have. See the enum's definition for more
369 information on each attribute. */
370 ENUM_BITFIELD (noalias_state
) noalias_state
: 2;
372 /* Mask of values saying the reasons why this variable has escaped
374 ENUM_BITFIELD (escape_type
) escape_mask
: 9;
376 /* Memory partition tag assigned to this symbol. */
379 /* If this variable is a pointer P that has been dereferenced, this
380 field is an artificial variable that represents the memory
381 location *P. Every other pointer Q that is type-compatible with
382 P will also have the same memory tag. If the variable is not a
383 pointer or if it is never dereferenced, this must be NULL.
384 FIXME, do we really need this here? How much slower would it be
385 to convert to hash table? */
388 /* Used when going out of SSA form to indicate which partition this
389 variable represents storage for. */
392 /* Used by var_map for the base index of ssa base variables. */
395 /* During into-ssa and the dominator optimizer, this field holds the
396 current version of this variable (an SSA_NAME). */
399 /* If this variable is a structure, this fields holds an array
400 of symbols representing each of the fields of the structure. */
401 VEC(tree
,gc
) *subvars
;
404 /* Container for variable annotation used by hashtable for annotations for
406 struct static_var_ann_d
GTY(())
408 struct var_ann_d ann
;
412 struct function_ann_d
GTY(())
414 struct tree_ann_common_d common
;
416 /* Pointer to the structure that contains the sets of global
417 variables modified by function calls. This field is only used
418 for FUNCTION_DECLs. */
419 ipa_reference_vars_info_t
GTY ((skip
)) reference_vars_info
;
422 typedef struct immediate_use_iterator_d
424 /* This is the current use the iterator is processing. */
425 ssa_use_operand_t
*imm_use
;
426 /* This marks the last use in the list (use node from SSA_NAME) */
427 ssa_use_operand_t
*end_p
;
428 /* This node is inserted and used to mark the end of the uses for a stmt. */
429 ssa_use_operand_t iter_node
;
430 /* This is the next ssa_name to visit. IMM_USE may get removed before
431 the next one is traversed to, so it must be cached early. */
432 ssa_use_operand_t
*next_imm_name
;
436 /* Use this iterator when simply looking at stmts. Adding, deleting or
437 modifying stmts will cause this iterator to malfunction. */
439 #define FOR_EACH_IMM_USE_FAST(DEST, ITER, SSAVAR) \
440 for ((DEST) = first_readonly_imm_use (&(ITER), (SSAVAR)); \
441 !end_readonly_imm_use_p (&(ITER)); \
442 (DEST) = next_readonly_imm_use (&(ITER)))
444 /* Use this iterator to visit each stmt which has a use of SSAVAR. */
446 #define FOR_EACH_IMM_USE_STMT(STMT, ITER, SSAVAR) \
447 for ((STMT) = first_imm_use_stmt (&(ITER), (SSAVAR)); \
448 !end_imm_use_stmt_p (&(ITER)); \
449 (STMT) = next_imm_use_stmt (&(ITER)))
451 /* Use this to terminate the FOR_EACH_IMM_USE_STMT loop early. Failure to
452 do so will result in leaving a iterator marker node in the immediate
453 use list, and nothing good will come from that. */
454 #define BREAK_FROM_IMM_USE_STMT(ITER) \
456 end_imm_use_stmt_traverse (&(ITER)); \
461 /* Use this iterator in combination with FOR_EACH_IMM_USE_STMT to
462 get access to each occurrence of ssavar on the stmt returned by
463 that iterator.. for instance:
465 FOR_EACH_IMM_USE_STMT (stmt, iter, var)
467 FOR_EACH_IMM_USE_ON_STMT (use_p, iter)
469 SET_USE (use_p) = blah;
474 #define FOR_EACH_IMM_USE_ON_STMT(DEST, ITER) \
475 for ((DEST) = first_imm_use_on_stmt (&(ITER)); \
476 !end_imm_use_on_stmt_p (&(ITER)); \
477 (DEST) = next_imm_use_on_stmt (&(ITER)))
481 struct stmt_ann_d
GTY(())
483 struct tree_ann_common_d common
;
485 /* Basic block that contains this statement. */
488 /* Operand cache for stmt. */
489 struct stmt_operands_d
GTY ((skip (""))) operands
;
491 /* Set of variables that have had their address taken in the statement. */
492 bitmap addresses_taken
;
494 /* Unique identifier for this statement. These ID's are to be created
495 by each pass on an as-needed basis in any order convenient for the
496 pass which needs statement UIDs. */
499 /* Nonzero if the statement references memory (at least one of its
500 expressions contains a non-register operand). */
501 unsigned references_memory
: 1;
503 /* Nonzero if the statement has been modified (meaning that the operands
504 need to be scanned again). */
505 unsigned modified
: 1;
507 /* Nonzero if the statement makes references to volatile storage. */
508 unsigned has_volatile_ops
: 1;
511 union tree_ann_d
GTY((desc ("ann_type ((tree_ann_t)&%h)")))
513 struct tree_ann_common_d
GTY((tag ("TREE_ANN_COMMON"))) common
;
514 struct var_ann_d
GTY((tag ("VAR_ANN"))) vdecl
;
515 struct function_ann_d
GTY((tag ("FUNCTION_ANN"))) fdecl
;
516 struct stmt_ann_d
GTY((tag ("STMT_ANN"))) stmt
;
519 typedef union tree_ann_d
*tree_ann_t
;
520 typedef struct var_ann_d
*var_ann_t
;
521 typedef struct function_ann_d
*function_ann_t
;
522 typedef struct stmt_ann_d
*stmt_ann_t
;
523 typedef struct tree_ann_common_d
*tree_ann_common_t
;
525 static inline tree_ann_common_t
tree_common_ann (const_tree
);
526 static inline tree_ann_common_t
get_tree_common_ann (tree
);
527 static inline var_ann_t
var_ann (const_tree
);
528 static inline var_ann_t
get_var_ann (tree
);
529 static inline function_ann_t
function_ann (const_tree
);
530 static inline function_ann_t
get_function_ann (tree
);
531 static inline stmt_ann_t
stmt_ann (tree
);
532 static inline bool has_stmt_ann (tree
);
533 static inline stmt_ann_t
get_stmt_ann (tree
);
534 static inline enum tree_ann_type
ann_type (tree_ann_t
);
535 static inline basic_block
bb_for_stmt (tree
);
536 extern void set_bb_for_stmt (tree
, basic_block
);
537 static inline bool noreturn_call_p (tree
);
538 static inline void update_stmt (tree
);
539 static inline bool stmt_modified_p (tree
);
540 static inline bitmap
may_aliases (const_tree
);
541 static inline int get_lineno (const_tree
);
542 static inline bitmap
addresses_taken (tree
);
544 /*---------------------------------------------------------------------------
545 Structure representing predictions in tree level.
546 ---------------------------------------------------------------------------*/
547 struct edge_prediction
GTY((chain_next ("%h.ep_next")))
549 struct edge_prediction
*ep_next
;
551 enum br_predictor ep_predictor
;
555 /* Accessors for basic block annotations. */
556 static inline tree
phi_nodes (const_basic_block
);
557 static inline void set_phi_nodes (basic_block
, tree
);
559 /*---------------------------------------------------------------------------
561 ---------------------------------------------------------------------------*/
562 struct int_tree_map
GTY(())
569 extern unsigned int int_tree_map_hash (const void *);
570 extern int int_tree_map_eq (const void *, const void *);
572 extern unsigned int uid_decl_map_hash (const void *);
573 extern int uid_decl_map_eq (const void *, const void *);
578 } referenced_var_iterator
;
581 /* This macro loops over all the referenced vars, one at a time, putting the
582 current var in VAR. Note: You are not allowed to add referenced variables
583 to the hashtable while using this macro. Doing so may cause it to behave
586 #define FOR_EACH_REFERENCED_VAR(VAR, ITER) \
587 for ((VAR) = first_referenced_var (&(ITER)); \
588 !end_referenced_vars_p (&(ITER)); \
589 (VAR) = next_referenced_var (&(ITER)))
595 } safe_referenced_var_iterator
;
597 /* This macro loops over all the referenced vars, one at a time, putting the
598 current var in VAR. You are allowed to add referenced variables during the
599 execution of this macro, however, the macro will not iterate over them. It
600 requires a temporary vector of trees, VEC, whose lifetime is controlled by
601 the caller. The purpose of the vector is to temporarily store the
602 referenced_variables hashtable so that adding referenced variables does not
603 affect the hashtable. */
605 #define FOR_EACH_REFERENCED_VAR_SAFE(VAR, VEC, ITER) \
606 for ((ITER).i = 0, fill_referenced_var_vec (&(VEC)); \
607 VEC_iterate (tree, (VEC), (ITER).i, (VAR)); \
610 extern tree
referenced_var_lookup (unsigned int);
611 extern bool referenced_var_check_and_insert (tree
);
612 #define num_referenced_vars htab_elements (gimple_referenced_vars (cfun))
613 #define referenced_var(i) referenced_var_lookup (i)
615 #define num_ssa_names (VEC_length (tree, cfun->gimple_df->ssa_names))
616 #define ssa_name(i) (VEC_index (tree, cfun->gimple_df->ssa_names, (i)))
618 /* Macros for showing usage statistics. */
619 #define SCALE(x) ((unsigned long) ((x) < 1024*10 \
621 : ((x) < 1024*1024*10 \
623 : (x) / (1024*1024))))
625 #define LABEL(x) ((x) < 1024*10 ? 'b' : ((x) < 1024*1024*10 ? 'k' : 'M'))
627 #define PERCENT(x,y) ((float)(x) * 100.0 / (float)(y))
629 /*---------------------------------------------------------------------------
631 ---------------------------------------------------------------------------*/
634 tree_stmt_iterator tsi
;
636 } block_stmt_iterator
;
638 static inline block_stmt_iterator
bsi_start (basic_block
);
639 static inline block_stmt_iterator
bsi_last (basic_block
);
640 static inline block_stmt_iterator
bsi_after_labels (basic_block
);
641 block_stmt_iterator
bsi_for_stmt (tree
);
642 static inline bool bsi_end_p (block_stmt_iterator
);
643 static inline void bsi_next (block_stmt_iterator
*);
644 static inline void bsi_prev (block_stmt_iterator
*);
645 static inline tree
bsi_stmt (block_stmt_iterator
);
646 static inline tree
* bsi_stmt_ptr (block_stmt_iterator
);
648 extern void bsi_remove (block_stmt_iterator
*, bool);
649 extern void bsi_move_before (block_stmt_iterator
*, block_stmt_iterator
*);
650 extern void bsi_move_after (block_stmt_iterator
*, block_stmt_iterator
*);
651 extern void bsi_move_to_bb_end (block_stmt_iterator
*, basic_block
);
653 enum bsi_iterator_update
655 /* Note that these are intentionally in the same order as TSI_FOO. They
656 mean exactly the same as their TSI_* counterparts. */
664 extern void bsi_insert_before (block_stmt_iterator
*, tree
,
665 enum bsi_iterator_update
);
666 extern void bsi_insert_after (block_stmt_iterator
*, tree
,
667 enum bsi_iterator_update
);
669 extern void bsi_replace (const block_stmt_iterator
*, tree
, bool);
671 /*---------------------------------------------------------------------------
673 ---------------------------------------------------------------------------*/
675 /* Parallel region information. Every parallel and workshare
676 directive is enclosed between two markers, the OMP_* directive
677 and a corresponding OMP_RETURN statement. */
681 /* The enclosing region. */
682 struct omp_region
*outer
;
684 /* First child region. */
685 struct omp_region
*inner
;
687 /* Next peer region. */
688 struct omp_region
*next
;
690 /* Block containing the omp directive as its last stmt. */
693 /* Block containing the OMP_RETURN as its last stmt. */
696 /* Block containing the OMP_CONTINUE as its last stmt. */
699 /* If this is a combined parallel+workshare region, this is a list
700 of additional arguments needed by the combined parallel+workshare
704 /* The code for the omp directive of this region. */
707 /* Schedule kind, only used for OMP_FOR type regions. */
708 enum omp_clause_schedule_kind sched_kind
;
710 /* True if this is a combined parallel+workshare region. */
711 bool is_combined_parallel
;
714 extern struct omp_region
*root_omp_region
;
715 extern struct omp_region
*new_omp_region (basic_block
, enum tree_code
,
716 struct omp_region
*);
717 extern void free_omp_regions (void);
718 void omp_expand_local (basic_block
);
719 extern tree
find_omp_clause (tree
, enum tree_code
);
720 tree
copy_var_decl (tree
, tree
, tree
);
722 /*---------------------------------------------------------------------------
724 ---------------------------------------------------------------------------*/
727 /* Location to track pending stmt for edge insertion. */
728 #define PENDING_STMT(e) ((e)->insns.t)
730 extern void delete_tree_cfg_annotations (void);
731 extern bool stmt_ends_bb_p (const_tree
);
732 extern bool is_ctrl_stmt (const_tree
);
733 extern bool is_ctrl_altering_stmt (const_tree
);
734 extern bool computed_goto_p (const_tree
);
735 extern bool simple_goto_p (const_tree
);
736 extern bool tree_can_make_abnormal_goto (const_tree
);
737 extern basic_block
single_noncomplex_succ (basic_block bb
);
738 extern void tree_dump_bb (basic_block
, FILE *, int);
739 extern void debug_tree_bb (basic_block
);
740 extern basic_block
debug_tree_bb_n (int);
741 extern void dump_tree_cfg (FILE *, int);
742 extern void debug_tree_cfg (int);
743 extern void dump_cfg_stats (FILE *);
744 extern void debug_cfg_stats (void);
745 extern void debug_loop_ir (void);
746 extern void print_loop_ir (FILE *);
747 extern void cleanup_dead_labels (void);
748 extern void group_case_labels (void);
749 extern tree
first_stmt (basic_block
);
750 extern tree
last_stmt (basic_block
);
751 extern tree
last_and_only_stmt (basic_block
);
752 extern edge
find_taken_edge (basic_block
, tree
);
753 extern basic_block
label_to_block_fn (struct function
*, tree
);
754 #define label_to_block(t) (label_to_block_fn (cfun, t))
755 extern void bsi_insert_on_edge (edge
, tree
);
756 extern basic_block
bsi_insert_on_edge_immediate (edge
, tree
);
757 extern void bsi_commit_one_edge_insert (edge
, basic_block
*);
758 extern void bsi_commit_edge_inserts (void);
759 extern void notice_special_calls (tree
);
760 extern void clear_special_calls (void);
761 extern void verify_stmts (void);
762 extern void verify_gimple (void);
763 extern void verify_gimple_1 (tree
);
764 extern tree
tree_block_label (basic_block
);
765 extern void extract_true_false_edges_from_block (basic_block
, edge
*, edge
*);
766 extern bool tree_duplicate_sese_region (edge
, edge
, basic_block
*, unsigned,
768 extern bool tree_duplicate_sese_tail (edge
, edge
, basic_block
*, unsigned,
770 extern void add_phi_args_after_copy_bb (basic_block
);
771 extern void add_phi_args_after_copy (basic_block
*, unsigned, edge
);
772 extern bool tree_purge_dead_abnormal_call_edges (basic_block
);
773 extern bool tree_purge_dead_eh_edges (basic_block
);
774 extern bool tree_purge_all_dead_eh_edges (const_bitmap
);
775 extern tree
gimplify_val (block_stmt_iterator
*, tree
, tree
);
776 extern tree
gimplify_build1 (block_stmt_iterator
*, enum tree_code
,
778 extern tree
gimplify_build2 (block_stmt_iterator
*, enum tree_code
,
780 extern tree
gimplify_build3 (block_stmt_iterator
*, enum tree_code
,
781 tree
, tree
, tree
, tree
);
782 extern void init_empty_tree_cfg (void);
783 extern void fold_cond_expr_cond (void);
784 extern void make_abnormal_goto_edges (basic_block
, bool);
785 extern void replace_uses_by (tree
, tree
);
786 extern void start_recording_case_labels (void);
787 extern void end_recording_case_labels (void);
788 extern basic_block
move_sese_region_to_fn (struct function
*, basic_block
,
790 void remove_edge_and_dominated_blocks (edge
);
792 /* In tree-cfgcleanup.c */
793 extern bitmap cfgcleanup_altered_bbs
;
794 extern bool cleanup_tree_cfg (void);
796 /* In tree-pretty-print.c. */
797 extern void dump_generic_bb (FILE *, basic_block
, int, int);
798 extern const char *op_symbol_code (enum tree_code
);
801 extern var_ann_t
create_var_ann (tree
);
802 extern function_ann_t
create_function_ann (tree
);
803 extern stmt_ann_t
create_stmt_ann (tree
);
804 extern tree_ann_common_t
create_tree_common_ann (tree
);
805 extern void dump_dfa_stats (FILE *);
806 extern void debug_dfa_stats (void);
807 extern void debug_referenced_vars (void);
808 extern void dump_referenced_vars (FILE *);
809 extern void dump_variable (FILE *, tree
);
810 extern void debug_variable (tree
);
811 extern void dump_subvars_for (FILE *, tree
);
812 extern void debug_subvars_for (tree
);
813 extern tree
get_virtual_var (tree
);
814 extern void add_referenced_var (tree
);
815 extern void remove_referenced_var (tree
);
816 extern void mark_symbols_for_renaming (tree
);
817 extern void find_new_referenced_vars (tree
*);
818 extern tree
make_rename_temp (tree
, const char *);
819 extern void set_default_def (tree
, tree
);
820 extern tree
gimple_default_def (struct function
*, tree
);
822 /* In tree-phinodes.c */
823 extern void reserve_phi_args_for_new_edge (basic_block
);
824 extern tree
create_phi_node (tree
, basic_block
);
825 extern void add_phi_arg (tree
, tree
, edge
);
826 extern void remove_phi_args (edge
);
827 extern void remove_phi_node (tree
, tree
, bool);
828 extern tree
phi_reverse (tree
);
830 /* In gimple-low.c */
831 extern void record_vars_into (tree
, tree
);
832 extern void record_vars (tree
);
833 extern bool block_may_fallthru (const_tree
);
835 /* In tree-ssa-alias.c */
836 extern unsigned int compute_may_aliases (void);
837 extern void dump_may_aliases_for (FILE *, tree
);
838 extern void debug_may_aliases_for (tree
);
839 extern void dump_alias_info (FILE *);
840 extern void debug_alias_info (void);
841 extern void dump_points_to_info (FILE *);
842 extern void debug_points_to_info (void);
843 extern void dump_points_to_info_for (FILE *, tree
);
844 extern void debug_points_to_info_for (tree
);
845 extern bool may_be_aliased (tree
);
846 extern struct ptr_info_def
*get_ptr_info (tree
);
847 extern void new_type_alias (tree
, tree
, tree
);
848 extern void count_uses_and_derefs (tree
, tree
, unsigned *, unsigned *,
850 static inline subvar_t
get_subvars_for_var (tree
);
851 static inline tree
get_subvar_at (tree
, unsigned HOST_WIDE_INT
);
852 static inline bool ref_contains_array_ref (const_tree
);
853 static inline bool array_ref_contains_indirect_ref (const_tree
);
854 extern tree
get_ref_base_and_extent (tree
, HOST_WIDE_INT
*,
855 HOST_WIDE_INT
*, HOST_WIDE_INT
*);
856 static inline bool var_can_have_subvars (const_tree
);
857 static inline bool overlap_subvar (unsigned HOST_WIDE_INT
,
858 unsigned HOST_WIDE_INT
,
860 extern tree
create_tag_raw (enum tree_code
, tree
, const char *);
861 extern void delete_mem_ref_stats (struct function
*);
862 extern void dump_mem_ref_stats (FILE *);
863 extern void debug_mem_ref_stats (void);
864 extern void debug_memory_partitions (void);
865 extern void debug_mem_sym_stats (tree var
);
866 extern void dump_mem_sym_stats_for_var (FILE *, tree
);
867 extern void debug_all_mem_sym_stats (void);
869 /* Call-back function for walk_use_def_chains(). At each reaching
870 definition, a function with this prototype is called. */
871 typedef bool (*walk_use_def_chains_fn
) (tree
, tree
, void *);
873 /* In tree-ssa-alias-warnings.c */
874 extern void strict_aliasing_warning_backend (void);
877 extern void init_tree_ssa (void);
878 extern edge
ssa_redirect_edge (edge
, basic_block
);
879 extern void flush_pending_stmts (edge
);
880 extern bool tree_ssa_useless_type_conversion (tree
);
881 extern bool useless_type_conversion_p (tree
, tree
);
882 extern bool types_compatible_p (tree
, tree
);
883 extern void verify_ssa (bool);
884 extern void delete_tree_ssa (void);
885 extern void walk_use_def_chains (tree
, walk_use_def_chains_fn
, void *, bool);
886 extern bool stmt_references_memory_p (tree
);
887 extern bool ssa_undefined_value_p (tree
);
889 /* In tree-into-ssa.c */
890 void update_ssa (unsigned);
891 void delete_update_ssa (void);
892 void register_new_name_mapping (tree
, tree
);
893 tree
create_new_def_for (tree
, tree
, def_operand_p
);
894 bool need_ssa_update_p (void);
895 bool name_mappings_registered_p (void);
896 bool name_registered_for_update_p (tree
);
897 bitmap
ssa_names_to_replace (void);
898 void release_ssa_name_after_update_ssa (tree
);
899 void compute_global_livein (bitmap
, bitmap
);
900 tree
duplicate_ssa_name (tree
, tree
);
901 void mark_sym_for_renaming (tree
);
902 void mark_set_for_renaming (bitmap
);
903 tree
get_current_def (tree
);
904 void set_current_def (tree
, tree
);
906 /* In tree-ssa-ccp.c */
907 bool fold_stmt (tree
*);
908 bool fold_stmt_inplace (tree
);
909 tree
widen_bitfield (tree
, tree
, tree
);
912 tree
vrp_evaluate_conditional (tree
, tree
);
913 void simplify_stmt_using_ranges (tree
);
915 /* In tree-ssa-dom.c */
916 extern void dump_dominator_optimization_stats (FILE *);
917 extern void debug_dominator_optimization_stats (void);
918 int loop_depth_of_name (tree
);
920 /* In tree-ssa-copy.c */
921 extern void merge_alias_info (tree
, tree
);
922 extern void propagate_value (use_operand_p
, tree
);
923 extern void propagate_tree_value (tree
*, tree
);
924 extern void replace_exp (use_operand_p
, tree
);
925 extern bool may_propagate_copy (tree
, tree
);
926 extern bool may_propagate_copy_into_asm (tree
);
932 /* Iv = BASE + STEP * i. */
935 /* True if this iv does not overflow. */
939 /* Description of number of iterations of a loop. All the expressions inside
940 the structure can be evaluated at the end of the loop's preheader
941 (and due to ssa form, also anywhere inside the body of the loop). */
943 struct tree_niter_desc
945 tree assumptions
; /* The boolean expression. If this expression evaluates
946 to false, then the other fields in this structure
947 should not be used; there is no guarantee that they
949 tree may_be_zero
; /* The boolean expression. If it evaluates to true,
950 the loop will exit in the first iteration (i.e.
951 its latch will not be executed), even if the niter
952 field says otherwise. */
953 tree niter
; /* The expression giving the number of iterations of
954 a loop (provided that assumptions == true and
955 may_be_zero == false), more precisely the number
956 of executions of the latch of the loop. */
957 double_int max
; /* The upper bound on the number of iterations of
960 /* The simplified shape of the exit condition. The loop exits if
961 CONTROL CMP BOUND is false, where CMP is one of NE_EXPR,
962 LT_EXPR, or GT_EXPR, and step of CONTROL is positive if CMP is
963 LE_EXPR and negative if CMP is GE_EXPR. This information is used
964 by loop unrolling. */
970 /* In tree-vectorizer.c */
971 unsigned vectorize_loops (void);
972 extern bool vect_can_force_dr_alignment_p (const_tree
, unsigned int);
973 extern tree
get_vectype_for_scalar_type (tree
);
975 /* In tree-ssa-phiopt.c */
976 bool empty_block_p (basic_block
);
977 basic_block
*blocks_in_phiopt_order (void);
979 /* In tree-ssa-loop*.c */
981 void tree_ssa_lim (void);
982 unsigned int tree_ssa_unswitch_loops (void);
983 unsigned int canonicalize_induction_variables (void);
984 unsigned int tree_unroll_loops_completely (bool);
985 unsigned int tree_ssa_prefetch_arrays (void);
986 unsigned int remove_empty_loops (void);
987 void tree_ssa_iv_optimize (void);
988 unsigned tree_predictive_commoning (void);
989 bool parallelize_loops (void);
991 bool number_of_iterations_exit (struct loop
*, edge
,
992 struct tree_niter_desc
*niter
, bool);
993 tree
find_loop_niter (struct loop
*, edge
*);
994 tree
loop_niter_by_eval (struct loop
*, edge
);
995 tree
find_loop_niter_by_eval (struct loop
*, edge
*);
996 void estimate_numbers_of_iterations (void);
997 bool scev_probably_wraps_p (tree
, tree
, tree
, struct loop
*, bool);
998 bool convert_affine_scev (struct loop
*, tree
, tree
*, tree
*, tree
, bool);
1000 bool nowrap_type_p (tree
);
1001 enum ev_direction
{EV_DIR_GROWS
, EV_DIR_DECREASES
, EV_DIR_UNKNOWN
};
1002 enum ev_direction
scev_direction (const_tree
);
1004 void free_numbers_of_iterations_estimates (void);
1005 void free_numbers_of_iterations_estimates_loop (struct loop
*);
1006 void rewrite_into_loop_closed_ssa (bitmap
, unsigned);
1007 void verify_loop_closed_ssa (void);
1008 bool for_each_index (tree
*, bool (*) (tree
, tree
*, void *), void *);
1009 void create_iv (tree
, tree
, tree
, struct loop
*, block_stmt_iterator
*, bool,
1011 basic_block
split_loop_exit_edge (edge
);
1012 unsigned force_expr_to_var_cost (tree
);
1013 void standard_iv_increment_position (struct loop
*, block_stmt_iterator
*,
1015 basic_block
ip_end_pos (struct loop
*);
1016 basic_block
ip_normal_pos (struct loop
*);
1017 bool tree_duplicate_loop_to_header_edge (struct loop
*, edge
,
1018 unsigned int, sbitmap
,
1019 edge
, VEC (edge
, heap
) **,
1021 struct loop
*tree_ssa_loop_version (struct loop
*, tree
,
1023 tree
expand_simple_operations (tree
);
1024 void substitute_in_loop_info (struct loop
*, tree
, tree
);
1025 edge
single_dom_exit (struct loop
*);
1026 bool can_unroll_loop_p (struct loop
*loop
, unsigned factor
,
1027 struct tree_niter_desc
*niter
);
1028 void tree_unroll_loop (struct loop
*, unsigned,
1029 edge
, struct tree_niter_desc
*);
1030 typedef void (*transform_callback
)(struct loop
*, void *);
1031 void tree_transform_and_unroll_loop (struct loop
*, unsigned,
1032 edge
, struct tree_niter_desc
*,
1033 transform_callback
, void *);
1034 bool contains_abnormal_ssa_name_p (tree
);
1035 bool stmt_dominates_stmt_p (tree
, tree
);
1036 void mark_virtual_ops_for_renaming (tree
);
1038 /* In tree-ssa-threadedge.c */
1039 extern bool potentially_threadable_block (basic_block
);
1040 extern void thread_across_edge (tree
, edge
, bool,
1041 VEC(tree
, heap
) **, tree (*) (tree
, tree
));
1043 /* In tree-ssa-loop-im.c */
1044 /* The possibilities of statement movement. */
1048 MOVE_IMPOSSIBLE
, /* No movement -- side effect expression. */
1049 MOVE_PRESERVE_EXECUTION
, /* Must not cause the non-executed statement
1050 become executed -- memory accesses, ... */
1051 MOVE_POSSIBLE
/* Unlimited movement. */
1053 extern enum move_pos
movement_possibility (tree
);
1054 char *get_lsm_tmp_name (tree
, unsigned);
1056 /* In tree-flow-inline.h */
1057 static inline bool is_call_clobbered (const_tree
);
1058 static inline void mark_call_clobbered (tree
, unsigned int);
1059 static inline void set_is_used (tree
);
1060 static inline bool unmodifiable_var_p (const_tree
);
1063 extern void make_eh_edges (tree
);
1064 extern bool tree_could_trap_p (tree
);
1065 extern bool tree_could_throw_p (tree
);
1066 extern bool tree_can_throw_internal (const_tree
);
1067 extern bool tree_can_throw_external (tree
);
1068 extern int lookup_stmt_eh_region (const_tree
);
1069 extern void add_stmt_to_eh_region (tree
, int);
1070 extern bool remove_stmt_from_eh_region (tree
);
1071 extern bool maybe_clean_or_replace_eh_stmt (tree
, tree
);
1073 /* In tree-ssa-pre.c */
1074 void add_to_value (tree
, tree
);
1075 void debug_value_expressions (tree
);
1076 void print_value_expressions (FILE *, tree
);
1080 tree
make_value_handle (tree
);
1081 void set_value_handle (tree
, tree
);
1082 bool expressions_equal_p (tree
, tree
);
1083 static inline tree
get_value_handle (tree
);
1084 void sort_vuses (VEC (tree
, gc
) *);
1085 void sort_vuses_heap (VEC (tree
, heap
) *);
1086 tree
vn_lookup_or_add (tree
);
1087 tree
vn_lookup_or_add_with_stmt (tree
, tree
);
1088 tree
vn_lookup_or_add_with_vuses (tree
, VEC (tree
, gc
) *);
1089 void vn_add (tree
, tree
);
1090 void vn_add_with_vuses (tree
, tree
, VEC (tree
, gc
) *);
1091 tree
vn_lookup_with_stmt (tree
, tree
);
1092 tree
vn_lookup (tree
);
1093 tree
vn_lookup_with_vuses (tree
, VEC (tree
, gc
) *);
1095 /* In tree-ssa-sink.c */
1096 bool is_hidden_global_store (tree
);
1099 void insert_edge_copies (tree
, basic_block
);
1100 void sra_insert_before (block_stmt_iterator
*, tree
);
1101 void sra_insert_after (block_stmt_iterator
*, tree
);
1102 void sra_init_cache (void);
1103 bool sra_type_can_be_decomposed_p (tree
);
1105 /* In tree-loop-linear.c */
1106 extern void linear_transform_loops (void);
1108 /* In tree-data-ref.c */
1109 extern void tree_check_data_deps (void);
1111 /* In tree-ssa-loop-ivopts.c */
1112 bool expr_invariant_in_loop_p (struct loop
*, tree
);
1113 bool multiplier_allowed_in_address_p (HOST_WIDE_INT
, enum machine_mode
);
1114 unsigned multiply_by_cost (HOST_WIDE_INT
, enum machine_mode
);
1116 /* In tree-ssa-threadupdate.c. */
1117 extern bool thread_through_all_blocks (bool);
1118 extern void register_jump_thread (edge
, edge
);
1121 tree
force_gimple_operand (tree
, tree
*, bool, tree
);
1122 tree
force_gimple_operand_bsi (block_stmt_iterator
*, tree
, bool, tree
,
1123 bool, enum bsi_iterator_update
);
1125 /* In tree-ssa-structalias.c */
1126 bool find_what_p_points_to (tree
);
1128 /* In tree-ssa-live.c */
1129 extern void remove_unused_locals (void);
1131 /* In tree-ssa-address.c */
1133 /* Description of a memory address. */
1137 tree symbol
, base
, index
, step
, offset
;
1140 struct affine_tree_combination
;
1141 tree
create_mem_ref (block_stmt_iterator
*, tree
,
1142 struct affine_tree_combination
*);
1143 rtx
addr_for_mem_ref (struct mem_address
*, bool);
1144 void get_address_description (tree
, struct mem_address
*);
1145 tree
maybe_fold_tmr (tree
);
1147 /* This structure is used during pushing fields onto the fieldstack
1148 to track the offset of the field, since bitpos_of_field gives it
1149 relative to its immediate containing type, and we want it relative
1150 to the ultimate containing object. */
1154 /* Type of the field. */
1157 /* Size, in bits, of the field. */
1163 /* Offset from the base of the base containing object to this field. */
1164 HOST_WIDE_INT offset
;
1166 /* Alias set for the field. */
1167 alias_set_type alias_set
;
1169 /* True, if this offset can be a base for further component accesses. */
1170 unsigned base_for_components
: 1;
1172 typedef struct fieldoff fieldoff_s
;
1174 DEF_VEC_O(fieldoff_s
);
1175 DEF_VEC_ALLOC_O(fieldoff_s
,heap
);
1176 int push_fields_onto_fieldstack (tree
, VEC(fieldoff_s
,heap
) **,
1177 HOST_WIDE_INT
, bool *, tree
);
1178 void sort_fieldstack (VEC(fieldoff_s
,heap
) *);
1180 void init_alias_heapvars (void);
1181 void delete_alias_heapvars (void);
1182 unsigned int execute_fixup_cfg (void);
1184 #include "tree-flow-inline.h"
1186 void swap_tree_operands (tree
, tree
*, tree
*);
1188 int least_common_multiple (int, int);
1190 #endif /* _TREE_FLOW_H */