1 /* Data and Control Flow Analysis for Trees.
2 Copyright (C) 2001, 2003, 2004, 2005, 2006, 2007, 2008
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"
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 vector 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(gimple
,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 /* Call-used variables in the function. If bit I is set, then
166 REFERENCED_VARS (I) is call-used at pure function call-sites. */
167 bitmap call_used_vars
;
169 /* Addressable variables in the function. If bit I is set, then
170 REFERENCED_VARS (I) has had its address taken. Note that
171 CALL_CLOBBERED_VARS and ADDRESSABLE_VARS are not related. An
172 addressable variable is not necessarily call-clobbered (e.g., a
173 local addressable whose address does not escape) and not all
174 call-clobbered variables are addressable (e.g., a local static
176 bitmap addressable_vars
;
178 /* Free list of SSA_NAMEs. */
181 /* Hashtable holding definition for symbol. If this field is not NULL, it
182 means that the first reference to this variable in the function is a
183 USE or a VUSE. In those cases, the SSA renamer creates an SSA name
184 for this variable with an empty defining statement. */
185 htab_t
GTY((param_is (union tree_node
))) default_defs
;
187 /* 'true' after aliases have been computed (see compute_may_aliases). */
188 unsigned int aliases_computed_p
: 1;
190 /* True if the code is in ssa form. */
191 unsigned int in_ssa_p
: 1;
193 struct ssa_operands ssa_operands
;
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 /* Mask of reasons this pointer's value escapes the function. */
235 ENUM_BITFIELD (escape_type
) escape_mask
: 9;
237 /* Nonzero if points-to analysis couldn't determine where this pointer
239 unsigned int pt_anything
: 1;
241 /* Nonzero if the value of this pointer escapes the current function. */
242 unsigned int value_escapes_p
: 1;
244 /* Nonzero if a memory tag is needed for this pointer. This is
245 true if this pointer is eventually dereferenced. */
246 unsigned int memory_tag_needed
: 1;
248 /* Nonzero if this pointer is really dereferenced. */
249 unsigned int is_dereferenced
: 1;
251 /* Nonzero if this pointer points to a global variable. */
252 unsigned int pt_global_mem
: 1;
254 /* Nonzero if this pointer points to NULL. */
255 unsigned int pt_null
: 1;
257 /* Set of variables that this pointer may point to. */
260 /* If this pointer has been dereferenced, and points-to information is
261 more precise than type-based aliasing, indirect references to this
262 pointer will be represented by this memory tag, instead of the type
263 tag computed by TBAA. */
268 /*---------------------------------------------------------------------------
269 Tree annotations stored in tree_base.ann
270 ---------------------------------------------------------------------------*/
271 enum tree_ann_type
{ TREE_ANN_COMMON
, VAR_ANN
, FUNCTION_ANN
};
273 struct tree_ann_common_d
GTY(())
275 /* Annotation type. */
276 enum tree_ann_type type
;
278 /* Record EH region number into a statement tree created during RTL
279 expansion (see gimple_to_tree). */
282 /* Auxiliary info specific to a pass. At all times, this
283 should either point to valid data or be NULL. */
284 PTR
GTY ((skip (""))) aux
;
286 /* The value handle for this expression. Used by GVN-PRE. */
287 tree
GTY((skip
)) value_handle
;
289 /* Pointer to original GIMPLE statement. Used during RTL expansion
290 (see gimple_to_tree). */
294 /* It is advantageous to avoid things like life analysis for variables which
295 do not need PHI nodes. This enum describes whether or not a particular
296 variable may need a PHI node. */
298 enum need_phi_state
{
299 /* This is the default. If we are still in this state after finding
300 all the definition and use sites, then we will assume the variable
301 needs PHI nodes. This is probably an overly conservative assumption. */
302 NEED_PHI_STATE_UNKNOWN
,
304 /* This state indicates that we have seen one or more sets of the
305 variable in a single basic block and that the sets dominate all
306 uses seen so far. If after finding all definition and use sites
307 we are still in this state, then the variable does not need any
311 /* This state indicates that we have either seen multiple definitions of
312 the variable in multiple blocks, or that we encountered a use in a
313 block that was not dominated by the block containing the set(s) of
314 this variable. This variable is assumed to need PHI nodes. */
319 /* The "no alias" attribute allows alias analysis to make more
320 aggressive assumptions when assigning alias sets, computing
321 points-to information and memory partitions. These attributes
322 are the result of user annotations or flags (e.g.,
323 -fargument-noalias). */
325 /* Default state. No special assumptions can be made about this
329 /* The symbol does not alias with other symbols that have a
330 NO_ALIAS* attribute. */
333 /* The symbol does not alias with other symbols that have a
334 NO_ALIAS*, and it may not alias with global symbols. */
337 /* The symbol does not alias with any other symbols. */
342 struct var_ann_d
GTY(())
344 struct tree_ann_common_d common
;
346 /* Used by the out of SSA pass to determine whether this variable has
347 been seen yet or not. */
348 unsigned out_of_ssa_tag
: 1;
350 /* Used when building base variable structures in a var_map. */
351 unsigned base_var_processed
: 1;
353 /* Nonzero if this variable was used after SSA optimizations were
354 applied. We set this when translating out of SSA form. */
357 /* This field indicates whether or not the variable may need PHI nodes.
358 See the enum's definition for more detailed information about the
360 ENUM_BITFIELD (need_phi_state
) need_phi_state
: 2;
362 /* Used during operand processing to determine if this variable is already
364 unsigned in_vuse_list
: 1;
366 /* Used during operand processing to determine if this variable is already
368 unsigned in_vdef_list
: 1;
370 /* True for HEAP artificial variables. These variables represent
371 the memory area allocated by a call to malloc. */
372 unsigned is_heapvar
: 1;
374 /* True if the variable is call clobbered. */
375 unsigned call_clobbered
: 1;
377 /* This field describes several "no alias" attributes that some
378 symbols are known to have. See the enum's definition for more
379 information on each attribute. */
380 ENUM_BITFIELD (noalias_state
) noalias_state
: 2;
382 /* Mask of values saying the reasons why this variable has escaped
384 ENUM_BITFIELD (escape_type
) escape_mask
: 9;
386 /* Memory partition tag assigned to this symbol. */
389 /* If this variable is a pointer P that has been dereferenced, this
390 field is an artificial variable that represents the memory
391 location *P. Every other pointer Q that is type-compatible with
392 P will also have the same memory tag. If the variable is not a
393 pointer or if it is never dereferenced, this must be NULL.
394 FIXME, do we really need this here? How much slower would it be
395 to convert to hash table? */
398 /* Used when going out of SSA form to indicate which partition this
399 variable represents storage for. */
402 /* Used by var_map for the base index of ssa base variables. */
405 /* During into-ssa and the dominator optimizer, this field holds the
406 current version of this variable (an SSA_NAME). */
410 /* Container for variable annotation used by hashtable for annotations for
412 struct static_var_ann_d
GTY(())
414 struct var_ann_d ann
;
418 struct function_ann_d
GTY(())
420 struct tree_ann_common_d common
;
422 /* Pointer to the structure that contains the sets of global
423 variables modified by function calls. This field is only used
424 for FUNCTION_DECLs. */
425 ipa_reference_vars_info_t
GTY ((skip
)) reference_vars_info
;
429 /* Immediate use lists are used to directly access all uses for an SSA
430 name and get pointers to the statement for each use.
432 The structure ssa_use_operand_d consists of PREV and NEXT pointers
433 to maintain the list. A USE pointer, which points to address where
434 the use is located and a LOC pointer which can point to the
435 statement where the use is located, or, in the case of the root
436 node, it points to the SSA name itself.
438 The list is anchored by an occurrence of ssa_operand_d *in* the
439 ssa_name node itself (named 'imm_uses'). This node is uniquely
440 identified by having a NULL USE pointer. and the LOC pointer
441 pointing back to the ssa_name node itself. This node forms the
442 base for a circular list, and initially this is the only node in
445 Fast iteration allows each use to be examined, but does not allow
446 any modifications to the uses or stmts.
448 Normal iteration allows insertion, deletion, and modification. the
449 iterator manages this by inserting a marker node into the list
450 immediately before the node currently being examined in the list.
451 this marker node is uniquely identified by having null stmt *and* a
454 When iterating to the next use, the iteration routines check to see
455 if the node after the marker has changed. if it has, then the node
456 following the marker is now the next one to be visited. if not, the
457 marker node is moved past that node in the list (visualize it as
458 bumping the marker node through the list). this continues until
459 the marker node is moved to the original anchor position. the
460 marker node is then removed from the list.
462 If iteration is halted early, the marker node must be removed from
463 the list before continuing. */
464 typedef struct immediate_use_iterator_d
466 /* This is the current use the iterator is processing. */
467 ssa_use_operand_t
*imm_use
;
468 /* This marks the last use in the list (use node from SSA_NAME) */
469 ssa_use_operand_t
*end_p
;
470 /* This node is inserted and used to mark the end of the uses for a stmt. */
471 ssa_use_operand_t iter_node
;
472 /* This is the next ssa_name to visit. IMM_USE may get removed before
473 the next one is traversed to, so it must be cached early. */
474 ssa_use_operand_t
*next_imm_name
;
478 /* Use this iterator when simply looking at stmts. Adding, deleting or
479 modifying stmts will cause this iterator to malfunction. */
481 #define FOR_EACH_IMM_USE_FAST(DEST, ITER, SSAVAR) \
482 for ((DEST) = first_readonly_imm_use (&(ITER), (SSAVAR)); \
483 !end_readonly_imm_use_p (&(ITER)); \
484 (DEST) = next_readonly_imm_use (&(ITER)))
486 /* Use this iterator to visit each stmt which has a use of SSAVAR. */
488 #define FOR_EACH_IMM_USE_STMT(STMT, ITER, SSAVAR) \
489 for ((STMT) = first_imm_use_stmt (&(ITER), (SSAVAR)); \
490 !end_imm_use_stmt_p (&(ITER)); \
491 (STMT) = next_imm_use_stmt (&(ITER)))
493 /* Use this to terminate the FOR_EACH_IMM_USE_STMT loop early. Failure to
494 do so will result in leaving a iterator marker node in the immediate
495 use list, and nothing good will come from that. */
496 #define BREAK_FROM_IMM_USE_STMT(ITER) \
498 end_imm_use_stmt_traverse (&(ITER)); \
503 /* Use this iterator in combination with FOR_EACH_IMM_USE_STMT to
504 get access to each occurrence of ssavar on the stmt returned by
505 that iterator.. for instance:
507 FOR_EACH_IMM_USE_STMT (stmt, iter, var)
509 FOR_EACH_IMM_USE_ON_STMT (use_p, iter)
511 SET_USE (use_p, blah);
516 #define FOR_EACH_IMM_USE_ON_STMT(DEST, ITER) \
517 for ((DEST) = first_imm_use_on_stmt (&(ITER)); \
518 !end_imm_use_on_stmt_p (&(ITER)); \
519 (DEST) = next_imm_use_on_stmt (&(ITER)))
523 union tree_ann_d
GTY((desc ("ann_type ((tree_ann_t)&%h)")))
525 struct tree_ann_common_d
GTY((tag ("TREE_ANN_COMMON"))) common
;
526 struct var_ann_d
GTY((tag ("VAR_ANN"))) vdecl
;
527 struct function_ann_d
GTY((tag ("FUNCTION_ANN"))) fdecl
;
530 typedef union tree_ann_d
*tree_ann_t
;
531 typedef struct var_ann_d
*var_ann_t
;
532 typedef struct function_ann_d
*function_ann_t
;
533 typedef struct tree_ann_common_d
*tree_ann_common_t
;
535 static inline tree_ann_common_t
tree_common_ann (const_tree
);
536 static inline tree_ann_common_t
get_tree_common_ann (tree
);
537 static inline var_ann_t
var_ann (const_tree
);
538 static inline var_ann_t
get_var_ann (tree
);
539 static inline function_ann_t
function_ann (const_tree
);
540 static inline function_ann_t
get_function_ann (tree
);
541 static inline enum tree_ann_type
ann_type (tree_ann_t
);
542 static inline void update_stmt (gimple
);
543 static inline bitmap
may_aliases (const_tree
);
544 static inline int get_lineno (const_gimple
);
546 /*---------------------------------------------------------------------------
547 Structure representing predictions in tree level.
548 ---------------------------------------------------------------------------*/
549 struct edge_prediction
GTY((chain_next ("%h.ep_next")))
551 struct edge_prediction
*ep_next
;
553 enum br_predictor ep_predictor
;
557 /* Accessors for basic block annotations. */
558 static inline gimple_seq
phi_nodes (const_basic_block
);
559 static inline void set_phi_nodes (basic_block
, gimple_seq
);
561 /*---------------------------------------------------------------------------
563 ---------------------------------------------------------------------------*/
564 struct int_tree_map
GTY(())
571 extern unsigned int int_tree_map_hash (const void *);
572 extern int int_tree_map_eq (const void *, const void *);
574 extern unsigned int uid_decl_map_hash (const void *);
575 extern int uid_decl_map_eq (const void *, const void *);
580 } referenced_var_iterator
;
583 /* This macro loops over all the referenced vars, one at a time, putting the
584 current var in VAR. Note: You are not allowed to add referenced variables
585 to the hashtable while using this macro. Doing so may cause it to behave
588 #define FOR_EACH_REFERENCED_VAR(VAR, ITER) \
589 for ((VAR) = first_referenced_var (&(ITER)); \
590 !end_referenced_vars_p (&(ITER)); \
591 (VAR) = next_referenced_var (&(ITER)))
597 } safe_referenced_var_iterator
;
599 /* This macro loops over all the referenced vars, one at a time, putting the
600 current var in VAR. You are allowed to add referenced variables during the
601 execution of this macro, however, the macro will not iterate over them. It
602 requires a temporary vector of trees, VEC, whose lifetime is controlled by
603 the caller. The purpose of the vector is to temporarily store the
604 referenced_variables hashtable so that adding referenced variables does not
605 affect the hashtable. */
607 #define FOR_EACH_REFERENCED_VAR_SAFE(VAR, VEC, ITER) \
608 for ((ITER).i = 0, fill_referenced_var_vec (&(VEC)); \
609 VEC_iterate (tree, (VEC), (ITER).i, (VAR)); \
612 extern tree
referenced_var_lookup (unsigned int);
613 extern bool referenced_var_check_and_insert (tree
);
614 #define num_referenced_vars htab_elements (gimple_referenced_vars (cfun))
615 #define referenced_var(i) referenced_var_lookup (i)
617 #define num_ssa_names (VEC_length (tree, cfun->gimple_df->ssa_names))
618 #define ssa_name(i) (VEC_index (tree, cfun->gimple_df->ssa_names, (i)))
620 /* Macros for showing usage statistics. */
621 #define SCALE(x) ((unsigned long) ((x) < 1024*10 \
623 : ((x) < 1024*1024*10 \
625 : (x) / (1024*1024))))
627 #define LABEL(x) ((x) < 1024*10 ? 'b' : ((x) < 1024*1024*10 ? 'k' : 'M'))
629 #define PERCENT(x,y) ((float)(x) * 100.0 / (float)(y))
631 /*---------------------------------------------------------------------------
633 ---------------------------------------------------------------------------*/
635 /* Parallel region information. Every parallel and workshare
636 directive is enclosed between two markers, the OMP_* directive
637 and a corresponding OMP_RETURN statement. */
641 /* The enclosing region. */
642 struct omp_region
*outer
;
644 /* First child region. */
645 struct omp_region
*inner
;
647 /* Next peer region. */
648 struct omp_region
*next
;
650 /* Block containing the omp directive as its last stmt. */
653 /* Block containing the OMP_RETURN as its last stmt. */
656 /* Block containing the OMP_CONTINUE as its last stmt. */
659 /* If this is a combined parallel+workshare region, this is a list
660 of additional arguments needed by the combined parallel+workshare
664 /* The code for the omp directive of this region. */
665 enum gimple_code type
;
667 /* Schedule kind, only used for OMP_FOR type regions. */
668 enum omp_clause_schedule_kind sched_kind
;
670 /* True if this is a combined parallel+workshare region. */
671 bool is_combined_parallel
;
674 extern struct omp_region
*root_omp_region
;
675 extern struct omp_region
*new_omp_region (basic_block
, enum gimple_code
,
676 struct omp_region
*);
677 extern void free_omp_regions (void);
678 void omp_expand_local (basic_block
);
679 extern tree
find_omp_clause (tree
, enum omp_clause_code
);
680 tree
copy_var_decl (tree
, tree
, tree
);
682 /*---------------------------------------------------------------------------
684 ---------------------------------------------------------------------------*/
687 /* Location to track pending stmt for edge insertion. */
688 #define PENDING_STMT(e) ((e)->insns.g)
690 extern void delete_tree_cfg_annotations (void);
691 extern bool stmt_ends_bb_p (gimple
);
692 extern bool is_ctrl_stmt (gimple
);
693 extern bool is_ctrl_altering_stmt (gimple
);
694 extern bool simple_goto_p (gimple
);
695 extern bool stmt_can_make_abnormal_goto (gimple
);
696 extern basic_block
single_noncomplex_succ (basic_block bb
);
697 extern void gimple_dump_bb (basic_block
, FILE *, int, int);
698 extern void gimple_debug_bb (basic_block
);
699 extern basic_block
gimple_debug_bb_n (int);
700 extern void gimple_dump_cfg (FILE *, int);
701 extern void gimple_debug_cfg (int);
702 extern void dump_cfg_stats (FILE *);
703 extern void dot_cfg (void);
704 extern void debug_cfg_stats (void);
705 extern void debug_loops (int);
706 extern void debug_loop (struct loop
*, int);
707 extern void debug_loop_num (unsigned, int);
708 extern void print_loops (FILE *, int);
709 extern void print_loops_bb (FILE *, basic_block
, int, int);
710 extern void cleanup_dead_labels (void);
711 extern void group_case_labels (void);
712 extern gimple
first_stmt (basic_block
);
713 extern gimple
last_stmt (basic_block
);
714 extern gimple
last_and_only_stmt (basic_block
);
715 extern edge
find_taken_edge (basic_block
, tree
);
716 extern basic_block
label_to_block_fn (struct function
*, tree
);
717 #define label_to_block(t) (label_to_block_fn (cfun, t))
718 extern void notice_special_calls (gimple
);
719 extern void clear_special_calls (void);
720 extern void verify_stmts (void);
721 extern void verify_gimple (void);
722 extern void verify_types_in_gimple_seq (gimple_seq
);
723 extern tree
gimple_block_label (basic_block
);
724 extern void extract_true_false_edges_from_block (basic_block
, edge
*, edge
*);
725 extern bool gimple_duplicate_sese_region (edge
, edge
, basic_block
*, unsigned,
727 extern bool gimple_duplicate_sese_tail (edge
, edge
, basic_block
*, unsigned,
729 extern void gather_blocks_in_sese_region (basic_block entry
, basic_block exit
,
730 VEC(basic_block
,heap
) **bbs_p
);
731 extern void add_phi_args_after_copy_bb (basic_block
);
732 extern void add_phi_args_after_copy (basic_block
*, unsigned, edge
);
733 extern bool gimple_purge_dead_abnormal_call_edges (basic_block
);
734 extern bool gimple_purge_dead_eh_edges (basic_block
);
735 extern bool gimple_purge_all_dead_eh_edges (const_bitmap
);
736 extern tree
gimplify_build1 (gimple_stmt_iterator
*, enum tree_code
,
738 extern tree
gimplify_build2 (gimple_stmt_iterator
*, enum tree_code
,
740 extern tree
gimplify_build3 (gimple_stmt_iterator
*, enum tree_code
,
741 tree
, tree
, tree
, tree
);
742 extern void init_empty_tree_cfg (void);
743 extern void init_empty_tree_cfg_for_function (struct function
*);
744 extern void fold_cond_expr_cond (void);
745 extern void make_abnormal_goto_edges (basic_block
, bool);
746 extern void replace_uses_by (tree
, tree
);
747 extern void start_recording_case_labels (void);
748 extern void end_recording_case_labels (void);
749 extern basic_block
move_sese_region_to_fn (struct function
*, basic_block
,
751 void remove_edge_and_dominated_blocks (edge
);
752 void mark_virtual_ops_in_bb (basic_block
);
754 /* In tree-cfgcleanup.c */
755 extern bitmap cfgcleanup_altered_bbs
;
756 extern bool cleanup_tree_cfg (void);
758 /* In tree-pretty-print.c. */
759 extern void dump_generic_bb (FILE *, basic_block
, int, int);
760 extern const char *op_symbol_code (enum tree_code
);
763 extern var_ann_t
create_var_ann (tree
);
764 extern function_ann_t
create_function_ann (tree
);
765 extern void renumber_gimple_stmt_uids (void);
766 extern tree_ann_common_t
create_tree_common_ann (tree
);
767 extern void dump_dfa_stats (FILE *);
768 extern void debug_dfa_stats (void);
769 extern void debug_referenced_vars (void);
770 extern void dump_referenced_vars (FILE *);
771 extern void dump_variable (FILE *, tree
);
772 extern void debug_variable (tree
);
773 extern tree
get_virtual_var (tree
);
774 extern void add_referenced_var (tree
);
775 extern void remove_referenced_var (tree
);
776 extern void mark_symbols_for_renaming (gimple
);
777 extern void find_new_referenced_vars (gimple
);
778 extern tree
make_rename_temp (tree
, const char *);
779 extern void set_default_def (tree
, tree
);
780 extern tree
gimple_default_def (struct function
*, tree
);
781 extern bool stmt_references_abnormal_ssa_name (gimple
);
782 extern bool refs_may_alias_p (tree
, tree
);
783 extern gimple
get_single_def_stmt (gimple
);
784 extern gimple
get_single_def_stmt_from_phi (tree
, gimple
);
785 extern gimple
get_single_def_stmt_with_phi (tree
, gimple
);
787 /* In tree-phinodes.c */
788 extern void reserve_phi_args_for_new_edge (basic_block
);
789 extern void add_phi_node_to_bb (gimple phi
, basic_block bb
);
790 extern gimple
make_phi_node (tree var
, int len
);
791 extern gimple
create_phi_node (tree
, basic_block
);
792 extern void add_phi_arg (gimple
, tree
, edge
);
793 extern void remove_phi_args (edge
);
794 extern void remove_phi_node (gimple_stmt_iterator
*, bool);
795 extern void init_phinodes (void);
796 extern void fini_phinodes (void);
797 extern void release_phi_node (gimple
);
798 #ifdef GATHER_STATISTICS
799 extern void phinodes_print_statistics (void);
802 /* In gimple-low.c */
803 extern void record_vars_into (tree
, tree
);
804 extern void record_vars (tree
);
805 extern bool block_may_fallthru (const_tree
);
806 extern bool gimple_seq_may_fallthru (gimple_seq
);
807 extern bool gimple_stmt_may_fallthru (gimple
);
809 /* In tree-ssa-alias.c */
810 extern unsigned int compute_may_aliases (void);
811 extern void dump_may_aliases_for (FILE *, tree
);
812 extern void debug_may_aliases_for (tree
);
813 extern void dump_alias_info (FILE *);
814 extern void debug_alias_info (void);
815 extern void dump_points_to_info (FILE *);
816 extern void debug_points_to_info (void);
817 extern void dump_points_to_info_for (FILE *, tree
);
818 extern void debug_points_to_info_for (tree
);
819 extern bool may_be_aliased (tree
);
820 extern bool may_alias_p (tree
, alias_set_type
, tree
, alias_set_type
, bool);
821 extern struct ptr_info_def
*get_ptr_info (tree
);
822 extern bool may_point_to_global_var (tree
);
823 extern void new_type_alias (tree
, tree
, tree
);
824 extern void count_uses_and_derefs (tree
, gimple
, unsigned *, unsigned *,
826 static inline bool ref_contains_array_ref (const_tree
);
827 static inline bool array_ref_contains_indirect_ref (const_tree
);
828 extern tree
get_ref_base_and_extent (tree
, HOST_WIDE_INT
*,
829 HOST_WIDE_INT
*, HOST_WIDE_INT
*);
830 extern tree
create_tag_raw (enum tree_code
, tree
, const char *);
831 extern void delete_mem_ref_stats (struct function
*);
832 extern void dump_mem_ref_stats (FILE *);
833 extern void debug_mem_ref_stats (void);
834 extern void debug_memory_partitions (void);
835 extern void debug_mem_sym_stats (tree var
);
836 extern void dump_mem_sym_stats_for_var (FILE *, tree
);
837 extern void debug_all_mem_sym_stats (void);
839 /* Call-back function for walk_use_def_chains(). At each reaching
840 definition, a function with this prototype is called. */
841 typedef bool (*walk_use_def_chains_fn
) (tree
, gimple
, void *);
843 /* In tree-ssa-alias-warnings.c */
844 extern void strict_aliasing_warning_backend (void);
849 /* Mapping for redirected edges. */
850 struct _edge_var_map
GTY(())
852 tree result
; /* PHI result. */
853 tree def
; /* PHI arg definition. */
855 typedef struct _edge_var_map edge_var_map
;
857 DEF_VEC_O(edge_var_map
);
858 DEF_VEC_ALLOC_O(edge_var_map
, heap
);
860 /* A vector of var maps. */
861 typedef VEC(edge_var_map
, heap
) *edge_var_map_vector
;
863 extern void init_tree_ssa (struct function
*);
864 extern void redirect_edge_var_map_add (edge
, tree
, tree
);
865 extern void redirect_edge_var_map_clear (edge
);
866 extern void redirect_edge_var_map_dup (edge
, edge
);
867 extern edge_var_map_vector
redirect_edge_var_map_vector (edge
);
868 extern void redirect_edge_var_map_destroy (void);
870 extern edge
ssa_redirect_edge (edge
, basic_block
);
871 extern void flush_pending_stmts (edge
);
872 extern void verify_ssa (bool);
873 extern void delete_tree_ssa (void);
874 extern void walk_use_def_chains (tree
, walk_use_def_chains_fn
, void *, bool);
875 extern bool ssa_undefined_value_p (tree
);
878 /* In tree-into-ssa.c */
879 void update_ssa (unsigned);
880 void delete_update_ssa (void);
881 void register_new_name_mapping (tree
, tree
);
882 tree
create_new_def_for (tree
, gimple
, def_operand_p
);
883 bool need_ssa_update_p (void);
884 bool name_mappings_registered_p (void);
885 bool name_registered_for_update_p (tree
);
886 bitmap
ssa_names_to_replace (void);
887 void release_ssa_name_after_update_ssa (tree
);
888 void compute_global_livein (bitmap
, bitmap
);
889 void mark_sym_for_renaming (tree
);
890 void mark_set_for_renaming (bitmap
);
891 tree
get_current_def (tree
);
892 void set_current_def (tree
, tree
);
894 /* In tree-ssanames.c */
895 extern void init_ssanames (struct function
*, int);
896 extern void fini_ssanames (void);
897 extern tree
make_ssa_name_fn (struct function
*, tree
, gimple
);
898 extern tree
duplicate_ssa_name (tree
, gimple
);
899 extern void duplicate_ssa_name_ptr_info (tree
, struct ptr_info_def
*);
900 extern void release_ssa_name (tree
);
901 extern void release_defs (gimple
);
902 extern void replace_ssa_name_symbol (tree
, tree
);
904 #ifdef GATHER_STATISTICS
905 extern void ssanames_print_statistics (void);
908 /* In tree-ssa-ccp.c */
909 bool fold_stmt (gimple_stmt_iterator
*);
910 bool fold_stmt_inplace (gimple
);
911 tree
get_symbol_constant_value (tree
);
912 tree
fold_const_aggregate_ref (tree
);
915 tree
vrp_evaluate_conditional (enum tree_code
, tree
, tree
, gimple
);
916 bool simplify_stmt_using_ranges (gimple_stmt_iterator
*);
918 /* In tree-ssa-dom.c */
919 extern void dump_dominator_optimization_stats (FILE *);
920 extern void debug_dominator_optimization_stats (void);
921 int loop_depth_of_name (tree
);
923 /* In tree-ssa-copy.c */
924 extern void merge_alias_info (tree
, tree
);
925 extern void propagate_value (use_operand_p
, tree
);
926 extern void propagate_tree_value (tree
*, tree
);
927 extern void propagate_tree_value_into_stmt (gimple_stmt_iterator
*, tree
);
928 extern void replace_exp (use_operand_p
, tree
);
929 extern bool may_propagate_copy (tree
, tree
);
930 extern bool may_propagate_copy_into_stmt (gimple
, tree
);
931 extern bool may_propagate_copy_into_asm (tree
);
937 /* Iv = BASE + STEP * i. */
940 /* True if this iv does not overflow. */
944 /* Description of number of iterations of a loop. All the expressions inside
945 the structure can be evaluated at the end of the loop's preheader
946 (and due to ssa form, also anywhere inside the body of the loop). */
948 struct tree_niter_desc
950 tree assumptions
; /* The boolean expression. If this expression evaluates
951 to false, then the other fields in this structure
952 should not be used; there is no guarantee that they
954 tree may_be_zero
; /* The boolean expression. If it evaluates to true,
955 the loop will exit in the first iteration (i.e.
956 its latch will not be executed), even if the niter
957 field says otherwise. */
958 tree niter
; /* The expression giving the number of iterations of
959 a loop (provided that assumptions == true and
960 may_be_zero == false), more precisely the number
961 of executions of the latch of the loop. */
962 double_int max
; /* The upper bound on the number of iterations of
965 /* The simplified shape of the exit condition. The loop exits if
966 CONTROL CMP BOUND is false, where CMP is one of NE_EXPR,
967 LT_EXPR, or GT_EXPR, and step of CONTROL is positive if CMP is
968 LE_EXPR and negative if CMP is GE_EXPR. This information is used
969 by loop unrolling. */
975 /* In tree-vectorizer.c */
976 unsigned vectorize_loops (void);
977 extern bool vect_can_force_dr_alignment_p (const_tree
, unsigned int);
978 extern tree
get_vectype_for_scalar_type (tree
);
980 /* In tree-ssa-phiopt.c */
981 bool empty_block_p (basic_block
);
982 basic_block
*blocks_in_phiopt_order (void);
984 /* In tree-ssa-loop*.c */
986 void tree_ssa_lim (void);
987 unsigned int tree_ssa_unswitch_loops (void);
988 unsigned int canonicalize_induction_variables (void);
989 unsigned int tree_unroll_loops_completely (bool, bool);
990 unsigned int tree_ssa_prefetch_arrays (void);
991 unsigned int remove_empty_loops (void);
992 void tree_ssa_iv_optimize (void);
993 unsigned tree_predictive_commoning (void);
994 bool parallelize_loops (void);
996 bool loop_only_exit_p (const struct loop
*, const_edge
);
997 bool number_of_iterations_exit (struct loop
*, edge
,
998 struct tree_niter_desc
*niter
, bool);
999 tree
find_loop_niter (struct loop
*, edge
*);
1000 tree
loop_niter_by_eval (struct loop
*, edge
);
1001 tree
find_loop_niter_by_eval (struct loop
*, edge
*);
1002 void estimate_numbers_of_iterations (void);
1003 bool scev_probably_wraps_p (tree
, tree
, gimple
, struct loop
*, bool);
1004 bool convert_affine_scev (struct loop
*, tree
, tree
*, tree
*, gimple
, bool);
1006 bool nowrap_type_p (tree
);
1007 enum ev_direction
{EV_DIR_GROWS
, EV_DIR_DECREASES
, EV_DIR_UNKNOWN
};
1008 enum ev_direction
scev_direction (const_tree
);
1010 void free_numbers_of_iterations_estimates (void);
1011 void free_numbers_of_iterations_estimates_loop (struct loop
*);
1012 void rewrite_into_loop_closed_ssa (bitmap
, unsigned);
1013 void verify_loop_closed_ssa (void);
1014 bool for_each_index (tree
*, bool (*) (tree
, tree
*, void *), void *);
1015 void create_iv (tree
, tree
, tree
, struct loop
*, gimple_stmt_iterator
*, bool,
1017 basic_block
split_loop_exit_edge (edge
);
1018 void standard_iv_increment_position (struct loop
*, gimple_stmt_iterator
*,
1020 basic_block
ip_end_pos (struct loop
*);
1021 basic_block
ip_normal_pos (struct loop
*);
1022 bool gimple_duplicate_loop_to_header_edge (struct loop
*, edge
,
1023 unsigned int, sbitmap
,
1024 edge
, VEC (edge
, heap
) **,
1026 struct loop
*slpeel_tree_duplicate_loop_to_edge_cfg (struct loop
*, edge
);
1027 void rename_variables_in_loop (struct loop
*);
1028 void rename_variables_in_bb (basic_block bb
);
1029 struct loop
*tree_ssa_loop_version (struct loop
*, tree
,
1031 tree
expand_simple_operations (tree
);
1032 void substitute_in_loop_info (struct loop
*, tree
, tree
);
1033 edge
single_dom_exit (struct loop
*);
1034 bool can_unroll_loop_p (struct loop
*loop
, unsigned factor
,
1035 struct tree_niter_desc
*niter
);
1036 void tree_unroll_loop (struct loop
*, unsigned,
1037 edge
, struct tree_niter_desc
*);
1038 typedef void (*transform_callback
)(struct loop
*, void *);
1039 void tree_transform_and_unroll_loop (struct loop
*, unsigned,
1040 edge
, struct tree_niter_desc
*,
1041 transform_callback
, void *);
1042 bool contains_abnormal_ssa_name_p (tree
);
1043 bool stmt_dominates_stmt_p (gimple
, gimple
);
1044 void mark_virtual_ops_for_renaming (gimple
);
1046 /* In tree-ssa-threadedge.c */
1047 extern bool potentially_threadable_block (basic_block
);
1048 extern void thread_across_edge (gimple
, edge
, bool,
1049 VEC(tree
, heap
) **, tree (*) (gimple
, gimple
));
1051 /* In tree-ssa-loop-im.c */
1052 /* The possibilities of statement movement. */
1056 MOVE_IMPOSSIBLE
, /* No movement -- side effect expression. */
1057 MOVE_PRESERVE_EXECUTION
, /* Must not cause the non-executed statement
1058 become executed -- memory accesses, ... */
1059 MOVE_POSSIBLE
/* Unlimited movement. */
1061 extern enum move_pos
movement_possibility (gimple
);
1062 char *get_lsm_tmp_name (tree
, unsigned);
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 (gimple
);
1072 extern bool tree_could_trap_p (tree
);
1073 extern bool operation_could_trap_p (enum tree_code
, bool, bool, tree
);
1074 extern bool stmt_could_throw_p (gimple
);
1075 extern bool tree_could_throw_p (tree
);
1076 extern bool stmt_can_throw_internal (gimple
);
1077 extern void add_stmt_to_eh_region (gimple
, int);
1078 extern bool remove_stmt_from_eh_region (gimple
);
1079 extern bool maybe_clean_or_replace_eh_stmt (gimple
, gimple
);
1080 extern void add_stmt_to_eh_region_fn (struct function
*, gimple
, int);
1081 extern bool remove_stmt_from_eh_region_fn (struct function
*, gimple
);
1082 extern int lookup_stmt_eh_region_fn (struct function
*, gimple
);
1083 extern int lookup_expr_eh_region (tree
);
1084 extern int lookup_stmt_eh_region (gimple
);
1085 extern bool verify_eh_edges (gimple
);
1088 /* In tree-ssa-pre.c */
1090 void add_to_value (unsigned int, struct pre_expr_d
*);
1091 void debug_value_expressions (unsigned int);
1092 void print_value_expressions (FILE *, unsigned int);
1096 tree
make_value_handle (tree
);
1097 void set_value_handle (tree
, tree
);
1098 bool expressions_equal_p (tree
, tree
);
1099 void sort_vuses (VEC (tree
, gc
) *);
1100 void sort_vuses_heap (VEC (tree
, heap
) *);
1101 tree
vn_lookup_or_add (tree
);
1102 tree
vn_lookup_or_add_with_stmt (tree
, gimple
);
1103 tree
vn_lookup_or_add_with_vuses (tree
, VEC (tree
, gc
) *);
1104 void vn_add (tree
, tree
);
1105 void vn_add_with_vuses (tree
, tree
, VEC (tree
, gc
) *);
1106 tree
vn_lookup_with_stmt (tree
, gimple
);
1107 tree
vn_lookup (tree
);
1108 tree
vn_lookup_with_vuses (tree
, VEC (tree
, gc
) *);
1110 /* In tree-ssa-sink.c */
1111 bool is_hidden_global_store (gimple
);
1114 void insert_edge_copies_seq (gimple_seq
, basic_block
);
1115 void sra_insert_before (gimple_stmt_iterator
*, gimple_seq
);
1116 void sra_insert_after (gimple_stmt_iterator
*, gimple_seq
);
1117 void sra_init_cache (void);
1118 bool sra_type_can_be_decomposed_p (tree
);
1120 /* In tree-loop-linear.c */
1121 extern void linear_transform_loops (void);
1122 extern unsigned perfect_loop_nest_depth (struct loop
*);
1125 extern void graphite_transform_loops (void);
1127 /* In tree-data-ref.c */
1128 extern void tree_check_data_deps (void);
1130 /* In tree-ssa-loop-ivopts.c */
1131 bool expr_invariant_in_loop_p (struct loop
*, tree
);
1132 bool stmt_invariant_in_loop_p (struct loop
*, gimple
);
1133 bool multiplier_allowed_in_address_p (HOST_WIDE_INT
, enum machine_mode
);
1134 unsigned multiply_by_cost (HOST_WIDE_INT
, enum machine_mode
, bool);
1136 /* In tree-ssa-threadupdate.c. */
1137 extern bool thread_through_all_blocks (bool);
1138 extern void register_jump_thread (edge
, edge
);
1141 tree
force_gimple_operand (tree
, gimple_seq
*, bool, tree
);
1142 tree
force_gimple_operand_gsi (gimple_stmt_iterator
*, tree
, bool, tree
,
1143 bool, enum gsi_iterator_update
);
1144 tree
gimple_fold_indirect_ref (tree
);
1146 /* In tree-ssa-structalias.c */
1147 bool find_what_p_points_to (tree
);
1148 bool clobber_what_escaped (void);
1149 void compute_call_used_vars (void);
1151 /* In tree-ssa-live.c */
1152 extern void remove_unused_locals (void);
1154 /* In tree-ssa-address.c */
1156 /* Description of a memory address. */
1160 tree symbol
, base
, index
, step
, offset
;
1163 struct affine_tree_combination
;
1164 tree
create_mem_ref (gimple_stmt_iterator
*, tree
,
1165 struct affine_tree_combination
*, bool);
1166 rtx
addr_for_mem_ref (struct mem_address
*, bool);
1167 void get_address_description (tree
, struct mem_address
*);
1168 tree
maybe_fold_tmr (tree
);
1170 void init_alias_heapvars (void);
1171 void delete_alias_heapvars (void);
1172 unsigned int execute_fixup_cfg (void);
1174 #include "tree-flow-inline.h"
1176 void swap_tree_operands (gimple
, tree
*, tree
*);
1178 int least_common_multiple (int, int);
1180 #endif /* _TREE_FLOW_H */