1 /* Control flow functions for trees.
2 Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
3 2010 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/>. */
24 #include "coretypes.h"
28 #include "basic-block.h"
33 #include "langhooks.h"
34 #include "tree-pretty-print.h"
35 #include "gimple-pretty-print.h"
36 #include "tree-flow.h"
38 #include "tree-dump.h"
39 #include "tree-pass.h"
43 #include "cfglayout.h"
44 #include "tree-ssa-propagate.h"
45 #include "value-prof.h"
46 #include "pointer-set.h"
47 #include "tree-inline.h"
49 /* This file contains functions for building the Control Flow Graph (CFG)
50 for a function tree. */
52 /* Local declarations. */
54 /* Initial capacity for the basic block array. */
55 static const int initial_cfg_capacity
= 20;
57 /* This hash table allows us to efficiently lookup all CASE_LABEL_EXPRs
58 which use a particular edge. The CASE_LABEL_EXPRs are chained together
59 via their TREE_CHAIN field, which we clear after we're done with the
60 hash table to prevent problems with duplication of GIMPLE_SWITCHes.
62 Access to this list of CASE_LABEL_EXPRs allows us to efficiently
63 update the case vector in response to edge redirections.
65 Right now this table is set up and torn down at key points in the
66 compilation process. It would be nice if we could make the table
67 more persistent. The key is getting notification of changes to
68 the CFG (particularly edge removal, creation and redirection). */
70 static struct pointer_map_t
*edge_to_cases
;
72 /* If we record edge_to_cases, this bitmap will hold indexes
73 of basic blocks that end in a GIMPLE_SWITCH which we touched
74 due to edge manipulations. */
76 static bitmap touched_switch_bbs
;
81 long num_merged_labels
;
84 static struct cfg_stats_d cfg_stats
;
86 /* Nonzero if we found a computed goto while building basic blocks. */
87 static bool found_computed_goto
;
89 /* Hash table to store last discriminator assigned for each locus. */
90 struct locus_discrim_map
95 static htab_t discriminator_per_locus
;
97 /* Basic blocks and flowgraphs. */
98 static void make_blocks (gimple_seq
);
99 static void factor_computed_gotos (void);
102 static void make_edges (void);
103 static void make_cond_expr_edges (basic_block
);
104 static void make_gimple_switch_edges (basic_block
);
105 static void make_goto_expr_edges (basic_block
);
106 static void make_gimple_asm_edges (basic_block
);
107 static unsigned int locus_map_hash (const void *);
108 static int locus_map_eq (const void *, const void *);
109 static void assign_discriminator (location_t
, basic_block
);
110 static edge
gimple_redirect_edge_and_branch (edge
, basic_block
);
111 static edge
gimple_try_redirect_by_replacing_jump (edge
, basic_block
);
112 static unsigned int split_critical_edges (void);
114 /* Various helpers. */
115 static inline bool stmt_starts_bb_p (gimple
, gimple
);
116 static int gimple_verify_flow_info (void);
117 static void gimple_make_forwarder_block (edge
);
118 static void gimple_cfg2vcg (FILE *);
119 static gimple
first_non_label_stmt (basic_block
);
121 /* Flowgraph optimization and cleanup. */
122 static void gimple_merge_blocks (basic_block
, basic_block
);
123 static bool gimple_can_merge_blocks_p (basic_block
, basic_block
);
124 static void remove_bb (basic_block
);
125 static edge
find_taken_edge_computed_goto (basic_block
, tree
);
126 static edge
find_taken_edge_cond_expr (basic_block
, tree
);
127 static edge
find_taken_edge_switch_expr (basic_block
, tree
);
128 static tree
find_case_label_for_value (gimple
, tree
);
129 static void group_case_labels_stmt (gimple
);
132 init_empty_tree_cfg_for_function (struct function
*fn
)
134 /* Initialize the basic block array. */
136 profile_status_for_function (fn
) = PROFILE_ABSENT
;
137 n_basic_blocks_for_function (fn
) = NUM_FIXED_BLOCKS
;
138 last_basic_block_for_function (fn
) = NUM_FIXED_BLOCKS
;
139 basic_block_info_for_function (fn
)
140 = VEC_alloc (basic_block
, gc
, initial_cfg_capacity
);
141 VEC_safe_grow_cleared (basic_block
, gc
,
142 basic_block_info_for_function (fn
),
143 initial_cfg_capacity
);
145 /* Build a mapping of labels to their associated blocks. */
146 label_to_block_map_for_function (fn
)
147 = VEC_alloc (basic_block
, gc
, initial_cfg_capacity
);
148 VEC_safe_grow_cleared (basic_block
, gc
,
149 label_to_block_map_for_function (fn
),
150 initial_cfg_capacity
);
152 SET_BASIC_BLOCK_FOR_FUNCTION (fn
, ENTRY_BLOCK
,
153 ENTRY_BLOCK_PTR_FOR_FUNCTION (fn
));
154 SET_BASIC_BLOCK_FOR_FUNCTION (fn
, EXIT_BLOCK
,
155 EXIT_BLOCK_PTR_FOR_FUNCTION (fn
));
157 ENTRY_BLOCK_PTR_FOR_FUNCTION (fn
)->next_bb
158 = EXIT_BLOCK_PTR_FOR_FUNCTION (fn
);
159 EXIT_BLOCK_PTR_FOR_FUNCTION (fn
)->prev_bb
160 = ENTRY_BLOCK_PTR_FOR_FUNCTION (fn
);
164 init_empty_tree_cfg (void)
166 init_empty_tree_cfg_for_function (cfun
);
169 /*---------------------------------------------------------------------------
171 ---------------------------------------------------------------------------*/
173 /* Entry point to the CFG builder for trees. SEQ is the sequence of
174 statements to be added to the flowgraph. */
177 build_gimple_cfg (gimple_seq seq
)
179 /* Register specific gimple functions. */
180 gimple_register_cfg_hooks ();
182 memset ((void *) &cfg_stats
, 0, sizeof (cfg_stats
));
184 init_empty_tree_cfg ();
186 found_computed_goto
= 0;
189 /* Computed gotos are hell to deal with, especially if there are
190 lots of them with a large number of destinations. So we factor
191 them to a common computed goto location before we build the
192 edge list. After we convert back to normal form, we will un-factor
193 the computed gotos since factoring introduces an unwanted jump. */
194 if (found_computed_goto
)
195 factor_computed_gotos ();
197 /* Make sure there is always at least one block, even if it's empty. */
198 if (n_basic_blocks
== NUM_FIXED_BLOCKS
)
199 create_empty_bb (ENTRY_BLOCK_PTR
);
201 /* Adjust the size of the array. */
202 if (VEC_length (basic_block
, basic_block_info
) < (size_t) n_basic_blocks
)
203 VEC_safe_grow_cleared (basic_block
, gc
, basic_block_info
, n_basic_blocks
);
205 /* To speed up statement iterator walks, we first purge dead labels. */
206 cleanup_dead_labels ();
208 /* Group case nodes to reduce the number of edges.
209 We do this after cleaning up dead labels because otherwise we miss
210 a lot of obvious case merging opportunities. */
211 group_case_labels ();
213 /* Create the edges of the flowgraph. */
214 discriminator_per_locus
= htab_create (13, locus_map_hash
, locus_map_eq
,
217 cleanup_dead_labels ();
218 htab_delete (discriminator_per_locus
);
220 /* Debugging dumps. */
222 /* Write the flowgraph to a VCG file. */
224 int local_dump_flags
;
225 FILE *vcg_file
= dump_begin (TDI_vcg
, &local_dump_flags
);
228 gimple_cfg2vcg (vcg_file
);
229 dump_end (TDI_vcg
, vcg_file
);
233 #ifdef ENABLE_CHECKING
239 execute_build_cfg (void)
241 gimple_seq body
= gimple_body (current_function_decl
);
243 build_gimple_cfg (body
);
244 gimple_set_body (current_function_decl
, NULL
);
245 if (dump_file
&& (dump_flags
& TDF_DETAILS
))
247 fprintf (dump_file
, "Scope blocks:\n");
248 dump_scope_blocks (dump_file
, dump_flags
);
253 struct gimple_opt_pass pass_build_cfg
=
259 execute_build_cfg
, /* execute */
262 0, /* static_pass_number */
263 TV_TREE_CFG
, /* tv_id */
264 PROP_gimple_leh
, /* properties_required */
265 PROP_cfg
, /* properties_provided */
266 0, /* properties_destroyed */
267 0, /* todo_flags_start */
268 TODO_verify_stmts
| TODO_cleanup_cfg
269 | TODO_dump_func
/* todo_flags_finish */
274 /* Return true if T is a computed goto. */
277 computed_goto_p (gimple t
)
279 return (gimple_code (t
) == GIMPLE_GOTO
280 && TREE_CODE (gimple_goto_dest (t
)) != LABEL_DECL
);
284 /* Search the CFG for any computed gotos. If found, factor them to a
285 common computed goto site. Also record the location of that site so
286 that we can un-factor the gotos after we have converted back to
290 factor_computed_gotos (void)
293 tree factored_label_decl
= NULL
;
295 gimple factored_computed_goto_label
= NULL
;
296 gimple factored_computed_goto
= NULL
;
298 /* We know there are one or more computed gotos in this function.
299 Examine the last statement in each basic block to see if the block
300 ends with a computed goto. */
304 gimple_stmt_iterator gsi
= gsi_last_bb (bb
);
310 last
= gsi_stmt (gsi
);
312 /* Ignore the computed goto we create when we factor the original
314 if (last
== factored_computed_goto
)
317 /* If the last statement is a computed goto, factor it. */
318 if (computed_goto_p (last
))
322 /* The first time we find a computed goto we need to create
323 the factored goto block and the variable each original
324 computed goto will use for their goto destination. */
325 if (!factored_computed_goto
)
327 basic_block new_bb
= create_empty_bb (bb
);
328 gimple_stmt_iterator new_gsi
= gsi_start_bb (new_bb
);
330 /* Create the destination of the factored goto. Each original
331 computed goto will put its desired destination into this
332 variable and jump to the label we create immediately
334 var
= create_tmp_var (ptr_type_node
, "gotovar");
336 /* Build a label for the new block which will contain the
337 factored computed goto. */
338 factored_label_decl
= create_artificial_label (UNKNOWN_LOCATION
);
339 factored_computed_goto_label
340 = gimple_build_label (factored_label_decl
);
341 gsi_insert_after (&new_gsi
, factored_computed_goto_label
,
344 /* Build our new computed goto. */
345 factored_computed_goto
= gimple_build_goto (var
);
346 gsi_insert_after (&new_gsi
, factored_computed_goto
, GSI_NEW_STMT
);
349 /* Copy the original computed goto's destination into VAR. */
350 assignment
= gimple_build_assign (var
, gimple_goto_dest (last
));
351 gsi_insert_before (&gsi
, assignment
, GSI_SAME_STMT
);
353 /* And re-vector the computed goto to the new destination. */
354 gimple_goto_set_dest (last
, factored_label_decl
);
360 /* Build a flowgraph for the sequence of stmts SEQ. */
363 make_blocks (gimple_seq seq
)
365 gimple_stmt_iterator i
= gsi_start (seq
);
367 bool start_new_block
= true;
368 bool first_stmt_of_seq
= true;
369 basic_block bb
= ENTRY_BLOCK_PTR
;
371 while (!gsi_end_p (i
))
378 /* If the statement starts a new basic block or if we have determined
379 in a previous pass that we need to create a new block for STMT, do
381 if (start_new_block
|| stmt_starts_bb_p (stmt
, prev_stmt
))
383 if (!first_stmt_of_seq
)
384 seq
= gsi_split_seq_before (&i
);
385 bb
= create_basic_block (seq
, NULL
, bb
);
386 start_new_block
= false;
389 /* Now add STMT to BB and create the subgraphs for special statement
391 gimple_set_bb (stmt
, bb
);
393 if (computed_goto_p (stmt
))
394 found_computed_goto
= true;
396 /* If STMT is a basic block terminator, set START_NEW_BLOCK for the
398 if (stmt_ends_bb_p (stmt
))
400 /* If the stmt can make abnormal goto use a new temporary
401 for the assignment to the LHS. This makes sure the old value
402 of the LHS is available on the abnormal edge. Otherwise
403 we will end up with overlapping life-ranges for abnormal
405 if (gimple_has_lhs (stmt
)
406 && stmt_can_make_abnormal_goto (stmt
)
407 && is_gimple_reg_type (TREE_TYPE (gimple_get_lhs (stmt
))))
409 tree lhs
= gimple_get_lhs (stmt
);
410 tree tmp
= create_tmp_var (TREE_TYPE (lhs
), NULL
);
411 gimple s
= gimple_build_assign (lhs
, tmp
);
412 gimple_set_location (s
, gimple_location (stmt
));
413 gimple_set_block (s
, gimple_block (stmt
));
414 gimple_set_lhs (stmt
, tmp
);
415 if (TREE_CODE (TREE_TYPE (tmp
)) == COMPLEX_TYPE
416 || TREE_CODE (TREE_TYPE (tmp
)) == VECTOR_TYPE
)
417 DECL_GIMPLE_REG_P (tmp
) = 1;
418 gsi_insert_after (&i
, s
, GSI_SAME_STMT
);
420 start_new_block
= true;
424 first_stmt_of_seq
= false;
429 /* Create and return a new empty basic block after bb AFTER. */
432 create_bb (void *h
, void *e
, basic_block after
)
438 /* Create and initialize a new basic block. Since alloc_block uses
439 GC allocation that clears memory to allocate a basic block, we do
440 not have to clear the newly allocated basic block here. */
443 bb
->index
= last_basic_block
;
445 bb
->il
.gimple
= ggc_alloc_cleared_gimple_bb_info ();
446 set_bb_seq (bb
, h
? (gimple_seq
) h
: gimple_seq_alloc ());
448 /* Add the new block to the linked list of blocks. */
449 link_block (bb
, after
);
451 /* Grow the basic block array if needed. */
452 if ((size_t) last_basic_block
== VEC_length (basic_block
, basic_block_info
))
454 size_t new_size
= last_basic_block
+ (last_basic_block
+ 3) / 4;
455 VEC_safe_grow_cleared (basic_block
, gc
, basic_block_info
, new_size
);
458 /* Add the newly created block to the array. */
459 SET_BASIC_BLOCK (last_basic_block
, bb
);
468 /*---------------------------------------------------------------------------
470 ---------------------------------------------------------------------------*/
472 /* Fold COND_EXPR_COND of each COND_EXPR. */
475 fold_cond_expr_cond (void)
481 gimple stmt
= last_stmt (bb
);
483 if (stmt
&& gimple_code (stmt
) == GIMPLE_COND
)
485 location_t loc
= gimple_location (stmt
);
489 fold_defer_overflow_warnings ();
490 cond
= fold_binary_loc (loc
, gimple_cond_code (stmt
), boolean_type_node
,
491 gimple_cond_lhs (stmt
), gimple_cond_rhs (stmt
));
494 zerop
= integer_zerop (cond
);
495 onep
= integer_onep (cond
);
498 zerop
= onep
= false;
500 fold_undefer_overflow_warnings (zerop
|| onep
,
502 WARN_STRICT_OVERFLOW_CONDITIONAL
);
504 gimple_cond_make_false (stmt
);
506 gimple_cond_make_true (stmt
);
511 /* Join all the blocks in the flowgraph. */
517 struct omp_region
*cur_region
= NULL
;
519 /* Create an edge from entry to the first block with executable
521 make_edge (ENTRY_BLOCK_PTR
, BASIC_BLOCK (NUM_FIXED_BLOCKS
), EDGE_FALLTHRU
);
523 /* Traverse the basic block array placing edges. */
526 gimple last
= last_stmt (bb
);
531 enum gimple_code code
= gimple_code (last
);
535 make_goto_expr_edges (bb
);
539 make_edge (bb
, EXIT_BLOCK_PTR
, 0);
543 make_cond_expr_edges (bb
);
547 make_gimple_switch_edges (bb
);
551 make_eh_edges (last
);
554 case GIMPLE_EH_DISPATCH
:
555 fallthru
= make_eh_dispatch_edges (last
);
559 /* If this function receives a nonlocal goto, then we need to
560 make edges from this call site to all the nonlocal goto
562 if (stmt_can_make_abnormal_goto (last
))
563 make_abnormal_goto_edges (bb
, true);
565 /* If this statement has reachable exception handlers, then
566 create abnormal edges to them. */
567 make_eh_edges (last
);
569 /* BUILTIN_RETURN is really a return statement. */
570 if (gimple_call_builtin_p (last
, BUILT_IN_RETURN
))
571 make_edge (bb
, EXIT_BLOCK_PTR
, 0), fallthru
= false;
572 /* Some calls are known not to return. */
574 fallthru
= !(gimple_call_flags (last
) & ECF_NORETURN
);
578 /* A GIMPLE_ASSIGN may throw internally and thus be considered
580 if (is_ctrl_altering_stmt (last
))
581 make_eh_edges (last
);
586 make_gimple_asm_edges (bb
);
590 case GIMPLE_OMP_PARALLEL
:
591 case GIMPLE_OMP_TASK
:
593 case GIMPLE_OMP_SINGLE
:
594 case GIMPLE_OMP_MASTER
:
595 case GIMPLE_OMP_ORDERED
:
596 case GIMPLE_OMP_CRITICAL
:
597 case GIMPLE_OMP_SECTION
:
598 cur_region
= new_omp_region (bb
, code
, cur_region
);
602 case GIMPLE_OMP_SECTIONS
:
603 cur_region
= new_omp_region (bb
, code
, cur_region
);
607 case GIMPLE_OMP_SECTIONS_SWITCH
:
611 case GIMPLE_OMP_ATOMIC_LOAD
:
612 case GIMPLE_OMP_ATOMIC_STORE
:
616 case GIMPLE_OMP_RETURN
:
617 /* In the case of a GIMPLE_OMP_SECTION, the edge will go
618 somewhere other than the next block. This will be
620 cur_region
->exit
= bb
;
621 fallthru
= cur_region
->type
!= GIMPLE_OMP_SECTION
;
622 cur_region
= cur_region
->outer
;
625 case GIMPLE_OMP_CONTINUE
:
626 cur_region
->cont
= bb
;
627 switch (cur_region
->type
)
630 /* Mark all GIMPLE_OMP_FOR and GIMPLE_OMP_CONTINUE
631 succs edges as abnormal to prevent splitting
633 single_succ_edge (cur_region
->entry
)->flags
|= EDGE_ABNORMAL
;
634 /* Make the loopback edge. */
635 make_edge (bb
, single_succ (cur_region
->entry
),
638 /* Create an edge from GIMPLE_OMP_FOR to exit, which
639 corresponds to the case that the body of the loop
640 is not executed at all. */
641 make_edge (cur_region
->entry
, bb
->next_bb
, EDGE_ABNORMAL
);
642 make_edge (bb
, bb
->next_bb
, EDGE_FALLTHRU
| EDGE_ABNORMAL
);
646 case GIMPLE_OMP_SECTIONS
:
647 /* Wire up the edges into and out of the nested sections. */
649 basic_block switch_bb
= single_succ (cur_region
->entry
);
651 struct omp_region
*i
;
652 for (i
= cur_region
->inner
; i
; i
= i
->next
)
654 gcc_assert (i
->type
== GIMPLE_OMP_SECTION
);
655 make_edge (switch_bb
, i
->entry
, 0);
656 make_edge (i
->exit
, bb
, EDGE_FALLTHRU
);
659 /* Make the loopback edge to the block with
660 GIMPLE_OMP_SECTIONS_SWITCH. */
661 make_edge (bb
, switch_bb
, 0);
663 /* Make the edge from the switch to exit. */
664 make_edge (switch_bb
, bb
->next_bb
, 0);
675 gcc_assert (!stmt_ends_bb_p (last
));
684 make_edge (bb
, bb
->next_bb
, EDGE_FALLTHRU
);
686 assign_discriminator (gimple_location (last
), bb
->next_bb
);
693 /* Fold COND_EXPR_COND of each COND_EXPR. */
694 fold_cond_expr_cond ();
697 /* Trivial hash function for a location_t. ITEM is a pointer to
698 a hash table entry that maps a location_t to a discriminator. */
701 locus_map_hash (const void *item
)
703 return ((const struct locus_discrim_map
*) item
)->locus
;
706 /* Equality function for the locus-to-discriminator map. VA and VB
707 point to the two hash table entries to compare. */
710 locus_map_eq (const void *va
, const void *vb
)
712 const struct locus_discrim_map
*a
= (const struct locus_discrim_map
*) va
;
713 const struct locus_discrim_map
*b
= (const struct locus_discrim_map
*) vb
;
714 return a
->locus
== b
->locus
;
717 /* Find the next available discriminator value for LOCUS. The
718 discriminator distinguishes among several basic blocks that
719 share a common locus, allowing for more accurate sample-based
723 next_discriminator_for_locus (location_t locus
)
725 struct locus_discrim_map item
;
726 struct locus_discrim_map
**slot
;
729 item
.discriminator
= 0;
730 slot
= (struct locus_discrim_map
**)
731 htab_find_slot_with_hash (discriminator_per_locus
, (void *) &item
,
732 (hashval_t
) locus
, INSERT
);
734 if (*slot
== HTAB_EMPTY_ENTRY
)
736 *slot
= XNEW (struct locus_discrim_map
);
738 (*slot
)->locus
= locus
;
739 (*slot
)->discriminator
= 0;
741 (*slot
)->discriminator
++;
742 return (*slot
)->discriminator
;
745 /* Return TRUE if LOCUS1 and LOCUS2 refer to the same source line. */
748 same_line_p (location_t locus1
, location_t locus2
)
750 expanded_location from
, to
;
752 if (locus1
== locus2
)
755 from
= expand_location (locus1
);
756 to
= expand_location (locus2
);
758 if (from
.line
!= to
.line
)
760 if (from
.file
== to
.file
)
762 return (from
.file
!= NULL
764 && strcmp (from
.file
, to
.file
) == 0);
767 /* Assign a unique discriminator value to block BB if it begins at the same
768 LOCUS as its predecessor block. */
771 assign_discriminator (location_t locus
, basic_block bb
)
773 gimple first_in_to_bb
, last_in_to_bb
;
775 if (locus
== 0 || bb
->discriminator
!= 0)
778 first_in_to_bb
= first_non_label_stmt (bb
);
779 last_in_to_bb
= last_stmt (bb
);
780 if ((first_in_to_bb
&& same_line_p (locus
, gimple_location (first_in_to_bb
)))
781 || (last_in_to_bb
&& same_line_p (locus
, gimple_location (last_in_to_bb
))))
782 bb
->discriminator
= next_discriminator_for_locus (locus
);
785 /* Create the edges for a GIMPLE_COND starting at block BB. */
788 make_cond_expr_edges (basic_block bb
)
790 gimple entry
= last_stmt (bb
);
791 gimple then_stmt
, else_stmt
;
792 basic_block then_bb
, else_bb
;
793 tree then_label
, else_label
;
795 location_t entry_locus
;
798 gcc_assert (gimple_code (entry
) == GIMPLE_COND
);
800 entry_locus
= gimple_location (entry
);
802 /* Entry basic blocks for each component. */
803 then_label
= gimple_cond_true_label (entry
);
804 else_label
= gimple_cond_false_label (entry
);
805 then_bb
= label_to_block (then_label
);
806 else_bb
= label_to_block (else_label
);
807 then_stmt
= first_stmt (then_bb
);
808 else_stmt
= first_stmt (else_bb
);
810 e
= make_edge (bb
, then_bb
, EDGE_TRUE_VALUE
);
811 assign_discriminator (entry_locus
, then_bb
);
812 e
->goto_locus
= gimple_location (then_stmt
);
814 e
->goto_block
= gimple_block (then_stmt
);
815 e
= make_edge (bb
, else_bb
, EDGE_FALSE_VALUE
);
818 assign_discriminator (entry_locus
, else_bb
);
819 e
->goto_locus
= gimple_location (else_stmt
);
821 e
->goto_block
= gimple_block (else_stmt
);
824 /* We do not need the labels anymore. */
825 gimple_cond_set_true_label (entry
, NULL_TREE
);
826 gimple_cond_set_false_label (entry
, NULL_TREE
);
830 /* Called for each element in the hash table (P) as we delete the
831 edge to cases hash table.
833 Clear all the TREE_CHAINs to prevent problems with copying of
834 SWITCH_EXPRs and structure sharing rules, then free the hash table
838 edge_to_cases_cleanup (const void *key ATTRIBUTE_UNUSED
, void **value
,
839 void *data ATTRIBUTE_UNUSED
)
843 for (t
= (tree
) *value
; t
; t
= next
)
845 next
= TREE_CHAIN (t
);
846 TREE_CHAIN (t
) = NULL
;
853 /* Start recording information mapping edges to case labels. */
856 start_recording_case_labels (void)
858 gcc_assert (edge_to_cases
== NULL
);
859 edge_to_cases
= pointer_map_create ();
860 touched_switch_bbs
= BITMAP_ALLOC (NULL
);
863 /* Return nonzero if we are recording information for case labels. */
866 recording_case_labels_p (void)
868 return (edge_to_cases
!= NULL
);
871 /* Stop recording information mapping edges to case labels and
872 remove any information we have recorded. */
874 end_recording_case_labels (void)
878 pointer_map_traverse (edge_to_cases
, edge_to_cases_cleanup
, NULL
);
879 pointer_map_destroy (edge_to_cases
);
880 edge_to_cases
= NULL
;
881 EXECUTE_IF_SET_IN_BITMAP (touched_switch_bbs
, 0, i
, bi
)
883 basic_block bb
= BASIC_BLOCK (i
);
886 gimple stmt
= last_stmt (bb
);
887 if (stmt
&& gimple_code (stmt
) == GIMPLE_SWITCH
)
888 group_case_labels_stmt (stmt
);
891 BITMAP_FREE (touched_switch_bbs
);
894 /* If we are inside a {start,end}_recording_cases block, then return
895 a chain of CASE_LABEL_EXPRs from T which reference E.
897 Otherwise return NULL. */
900 get_cases_for_edge (edge e
, gimple t
)
905 /* If we are not recording cases, then we do not have CASE_LABEL_EXPR
906 chains available. Return NULL so the caller can detect this case. */
907 if (!recording_case_labels_p ())
910 slot
= pointer_map_contains (edge_to_cases
, e
);
914 /* If we did not find E in the hash table, then this must be the first
915 time we have been queried for information about E & T. Add all the
916 elements from T to the hash table then perform the query again. */
918 n
= gimple_switch_num_labels (t
);
919 for (i
= 0; i
< n
; i
++)
921 tree elt
= gimple_switch_label (t
, i
);
922 tree lab
= CASE_LABEL (elt
);
923 basic_block label_bb
= label_to_block (lab
);
924 edge this_edge
= find_edge (e
->src
, label_bb
);
926 /* Add it to the chain of CASE_LABEL_EXPRs referencing E, or create
928 slot
= pointer_map_insert (edge_to_cases
, this_edge
);
929 TREE_CHAIN (elt
) = (tree
) *slot
;
933 return (tree
) *pointer_map_contains (edge_to_cases
, e
);
936 /* Create the edges for a GIMPLE_SWITCH starting at block BB. */
939 make_gimple_switch_edges (basic_block bb
)
941 gimple entry
= last_stmt (bb
);
942 location_t entry_locus
;
945 entry_locus
= gimple_location (entry
);
947 n
= gimple_switch_num_labels (entry
);
949 for (i
= 0; i
< n
; ++i
)
951 tree lab
= CASE_LABEL (gimple_switch_label (entry
, i
));
952 basic_block label_bb
= label_to_block (lab
);
953 make_edge (bb
, label_bb
, 0);
954 assign_discriminator (entry_locus
, label_bb
);
959 /* Return the basic block holding label DEST. */
962 label_to_block_fn (struct function
*ifun
, tree dest
)
964 int uid
= LABEL_DECL_UID (dest
);
966 /* We would die hard when faced by an undefined label. Emit a label to
967 the very first basic block. This will hopefully make even the dataflow
968 and undefined variable warnings quite right. */
969 if (seen_error () && uid
< 0)
971 gimple_stmt_iterator gsi
= gsi_start_bb (BASIC_BLOCK (NUM_FIXED_BLOCKS
));
974 stmt
= gimple_build_label (dest
);
975 gsi_insert_before (&gsi
, stmt
, GSI_NEW_STMT
);
976 uid
= LABEL_DECL_UID (dest
);
978 if (VEC_length (basic_block
, ifun
->cfg
->x_label_to_block_map
)
979 <= (unsigned int) uid
)
981 return VEC_index (basic_block
, ifun
->cfg
->x_label_to_block_map
, uid
);
984 /* Create edges for an abnormal goto statement at block BB. If FOR_CALL
985 is true, the source statement is a CALL_EXPR instead of a GOTO_EXPR. */
988 make_abnormal_goto_edges (basic_block bb
, bool for_call
)
990 basic_block target_bb
;
991 gimple_stmt_iterator gsi
;
993 FOR_EACH_BB (target_bb
)
994 for (gsi
= gsi_start_bb (target_bb
); !gsi_end_p (gsi
); gsi_next (&gsi
))
996 gimple label_stmt
= gsi_stmt (gsi
);
999 if (gimple_code (label_stmt
) != GIMPLE_LABEL
)
1002 target
= gimple_label_label (label_stmt
);
1004 /* Make an edge to every label block that has been marked as a
1005 potential target for a computed goto or a non-local goto. */
1006 if ((FORCED_LABEL (target
) && !for_call
)
1007 || (DECL_NONLOCAL (target
) && for_call
))
1009 make_edge (bb
, target_bb
, EDGE_ABNORMAL
);
1015 /* Create edges for a goto statement at block BB. */
1018 make_goto_expr_edges (basic_block bb
)
1020 gimple_stmt_iterator last
= gsi_last_bb (bb
);
1021 gimple goto_t
= gsi_stmt (last
);
1023 /* A simple GOTO creates normal edges. */
1024 if (simple_goto_p (goto_t
))
1026 tree dest
= gimple_goto_dest (goto_t
);
1027 basic_block label_bb
= label_to_block (dest
);
1028 edge e
= make_edge (bb
, label_bb
, EDGE_FALLTHRU
);
1029 e
->goto_locus
= gimple_location (goto_t
);
1030 assign_discriminator (e
->goto_locus
, label_bb
);
1032 e
->goto_block
= gimple_block (goto_t
);
1033 gsi_remove (&last
, true);
1037 /* A computed GOTO creates abnormal edges. */
1038 make_abnormal_goto_edges (bb
, false);
1041 /* Create edges for an asm statement with labels at block BB. */
1044 make_gimple_asm_edges (basic_block bb
)
1046 gimple stmt
= last_stmt (bb
);
1047 location_t stmt_loc
= gimple_location (stmt
);
1048 int i
, n
= gimple_asm_nlabels (stmt
);
1050 for (i
= 0; i
< n
; ++i
)
1052 tree label
= TREE_VALUE (gimple_asm_label_op (stmt
, i
));
1053 basic_block label_bb
= label_to_block (label
);
1054 make_edge (bb
, label_bb
, 0);
1055 assign_discriminator (stmt_loc
, label_bb
);
1059 /*---------------------------------------------------------------------------
1061 ---------------------------------------------------------------------------*/
1063 /* Cleanup useless labels in basic blocks. This is something we wish
1064 to do early because it allows us to group case labels before creating
1065 the edges for the CFG, and it speeds up block statement iterators in
1066 all passes later on.
1067 We rerun this pass after CFG is created, to get rid of the labels that
1068 are no longer referenced. After then we do not run it any more, since
1069 (almost) no new labels should be created. */
1071 /* A map from basic block index to the leading label of that block. */
1072 static struct label_record
1077 /* True if the label is referenced from somewhere. */
1081 /* Given LABEL return the first label in the same basic block. */
1084 main_block_label (tree label
)
1086 basic_block bb
= label_to_block (label
);
1087 tree main_label
= label_for_bb
[bb
->index
].label
;
1089 /* label_to_block possibly inserted undefined label into the chain. */
1092 label_for_bb
[bb
->index
].label
= label
;
1096 label_for_bb
[bb
->index
].used
= true;
1100 /* Clean up redundant labels within the exception tree. */
1103 cleanup_dead_labels_eh (void)
1110 if (cfun
->eh
== NULL
)
1113 for (i
= 1; VEC_iterate (eh_landing_pad
, cfun
->eh
->lp_array
, i
, lp
); ++i
)
1114 if (lp
&& lp
->post_landing_pad
)
1116 lab
= main_block_label (lp
->post_landing_pad
);
1117 if (lab
!= lp
->post_landing_pad
)
1119 EH_LANDING_PAD_NR (lp
->post_landing_pad
) = 0;
1120 EH_LANDING_PAD_NR (lab
) = lp
->index
;
1124 FOR_ALL_EH_REGION (r
)
1128 case ERT_MUST_NOT_THROW
:
1134 for (c
= r
->u
.eh_try
.first_catch
; c
; c
= c
->next_catch
)
1138 c
->label
= main_block_label (lab
);
1143 case ERT_ALLOWED_EXCEPTIONS
:
1144 lab
= r
->u
.allowed
.label
;
1146 r
->u
.allowed
.label
= main_block_label (lab
);
1152 /* Cleanup redundant labels. This is a three-step process:
1153 1) Find the leading label for each block.
1154 2) Redirect all references to labels to the leading labels.
1155 3) Cleanup all useless labels. */
1158 cleanup_dead_labels (void)
1161 label_for_bb
= XCNEWVEC (struct label_record
, last_basic_block
);
1163 /* Find a suitable label for each block. We use the first user-defined
1164 label if there is one, or otherwise just the first label we see. */
1167 gimple_stmt_iterator i
;
1169 for (i
= gsi_start_bb (bb
); !gsi_end_p (i
); gsi_next (&i
))
1172 gimple stmt
= gsi_stmt (i
);
1174 if (gimple_code (stmt
) != GIMPLE_LABEL
)
1177 label
= gimple_label_label (stmt
);
1179 /* If we have not yet seen a label for the current block,
1180 remember this one and see if there are more labels. */
1181 if (!label_for_bb
[bb
->index
].label
)
1183 label_for_bb
[bb
->index
].label
= label
;
1187 /* If we did see a label for the current block already, but it
1188 is an artificially created label, replace it if the current
1189 label is a user defined label. */
1190 if (!DECL_ARTIFICIAL (label
)
1191 && DECL_ARTIFICIAL (label_for_bb
[bb
->index
].label
))
1193 label_for_bb
[bb
->index
].label
= label
;
1199 /* Now redirect all jumps/branches to the selected label.
1200 First do so for each block ending in a control statement. */
1203 gimple stmt
= last_stmt (bb
);
1207 switch (gimple_code (stmt
))
1211 tree true_label
= gimple_cond_true_label (stmt
);
1212 tree false_label
= gimple_cond_false_label (stmt
);
1215 gimple_cond_set_true_label (stmt
, main_block_label (true_label
));
1217 gimple_cond_set_false_label (stmt
, main_block_label (false_label
));
1223 size_t i
, n
= gimple_switch_num_labels (stmt
);
1225 /* Replace all destination labels. */
1226 for (i
= 0; i
< n
; ++i
)
1228 tree case_label
= gimple_switch_label (stmt
, i
);
1229 tree label
= main_block_label (CASE_LABEL (case_label
));
1230 CASE_LABEL (case_label
) = label
;
1237 int i
, n
= gimple_asm_nlabels (stmt
);
1239 for (i
= 0; i
< n
; ++i
)
1241 tree cons
= gimple_asm_label_op (stmt
, i
);
1242 tree label
= main_block_label (TREE_VALUE (cons
));
1243 TREE_VALUE (cons
) = label
;
1248 /* We have to handle gotos until they're removed, and we don't
1249 remove them until after we've created the CFG edges. */
1251 if (!computed_goto_p (stmt
))
1253 tree new_dest
= main_block_label (gimple_goto_dest (stmt
));
1254 gimple_goto_set_dest (stmt
, new_dest
);
1263 /* Do the same for the exception region tree labels. */
1264 cleanup_dead_labels_eh ();
1266 /* Finally, purge dead labels. All user-defined labels and labels that
1267 can be the target of non-local gotos and labels which have their
1268 address taken are preserved. */
1271 gimple_stmt_iterator i
;
1272 tree label_for_this_bb
= label_for_bb
[bb
->index
].label
;
1274 if (!label_for_this_bb
)
1277 /* If the main label of the block is unused, we may still remove it. */
1278 if (!label_for_bb
[bb
->index
].used
)
1279 label_for_this_bb
= NULL
;
1281 for (i
= gsi_start_bb (bb
); !gsi_end_p (i
); )
1284 gimple stmt
= gsi_stmt (i
);
1286 if (gimple_code (stmt
) != GIMPLE_LABEL
)
1289 label
= gimple_label_label (stmt
);
1291 if (label
== label_for_this_bb
1292 || !DECL_ARTIFICIAL (label
)
1293 || DECL_NONLOCAL (label
)
1294 || FORCED_LABEL (label
))
1297 gsi_remove (&i
, true);
1301 free (label_for_bb
);
1304 /* Scan the sorted vector of cases in STMT (a GIMPLE_SWITCH) and combine
1305 the ones jumping to the same label.
1306 Eg. three separate entries 1: 2: 3: become one entry 1..3: */
1309 group_case_labels_stmt (gimple stmt
)
1311 int old_size
= gimple_switch_num_labels (stmt
);
1312 int i
, j
, new_size
= old_size
;
1313 tree default_case
= NULL_TREE
;
1314 tree default_label
= NULL_TREE
;
1317 /* The default label is always the first case in a switch
1318 statement after gimplification if it was not optimized
1320 if (!CASE_LOW (gimple_switch_default_label (stmt
))
1321 && !CASE_HIGH (gimple_switch_default_label (stmt
)))
1323 default_case
= gimple_switch_default_label (stmt
);
1324 default_label
= CASE_LABEL (default_case
);
1328 has_default
= false;
1330 /* Look for possible opportunities to merge cases. */
1335 while (i
< old_size
)
1337 tree base_case
, base_label
, base_high
;
1338 base_case
= gimple_switch_label (stmt
, i
);
1340 gcc_assert (base_case
);
1341 base_label
= CASE_LABEL (base_case
);
1343 /* Discard cases that have the same destination as the
1345 if (base_label
== default_label
)
1347 gimple_switch_set_label (stmt
, i
, NULL_TREE
);
1353 base_high
= CASE_HIGH (base_case
)
1354 ? CASE_HIGH (base_case
)
1355 : CASE_LOW (base_case
);
1358 /* Try to merge case labels. Break out when we reach the end
1359 of the label vector or when we cannot merge the next case
1360 label with the current one. */
1361 while (i
< old_size
)
1363 tree merge_case
= gimple_switch_label (stmt
, i
);
1364 tree merge_label
= CASE_LABEL (merge_case
);
1365 tree t
= int_const_binop (PLUS_EXPR
, base_high
,
1366 integer_one_node
, 1);
1368 /* Merge the cases if they jump to the same place,
1369 and their ranges are consecutive. */
1370 if (merge_label
== base_label
1371 && tree_int_cst_equal (CASE_LOW (merge_case
), t
))
1373 base_high
= CASE_HIGH (merge_case
) ?
1374 CASE_HIGH (merge_case
) : CASE_LOW (merge_case
);
1375 CASE_HIGH (base_case
) = base_high
;
1376 gimple_switch_set_label (stmt
, i
, NULL_TREE
);
1385 /* Compress the case labels in the label vector, and adjust the
1386 length of the vector. */
1387 for (i
= 0, j
= 0; i
< new_size
; i
++)
1389 while (! gimple_switch_label (stmt
, j
))
1391 gimple_switch_set_label (stmt
, i
,
1392 gimple_switch_label (stmt
, j
++));
1395 gcc_assert (new_size
<= old_size
);
1396 gimple_switch_set_num_labels (stmt
, new_size
);
1399 /* Look for blocks ending in a multiway branch (a GIMPLE_SWITCH),
1400 and scan the sorted vector of cases. Combine the ones jumping to the
1404 group_case_labels (void)
1410 gimple stmt
= last_stmt (bb
);
1411 if (stmt
&& gimple_code (stmt
) == GIMPLE_SWITCH
)
1412 group_case_labels_stmt (stmt
);
1416 /* Checks whether we can merge block B into block A. */
1419 gimple_can_merge_blocks_p (basic_block a
, basic_block b
)
1422 gimple_stmt_iterator gsi
;
1425 if (!single_succ_p (a
))
1428 if (single_succ_edge (a
)->flags
& (EDGE_ABNORMAL
| EDGE_EH
))
1431 if (single_succ (a
) != b
)
1434 if (!single_pred_p (b
))
1437 if (b
== EXIT_BLOCK_PTR
)
1440 /* If A ends by a statement causing exceptions or something similar, we
1441 cannot merge the blocks. */
1442 stmt
= last_stmt (a
);
1443 if (stmt
&& stmt_ends_bb_p (stmt
))
1446 /* Do not allow a block with only a non-local label to be merged. */
1448 && gimple_code (stmt
) == GIMPLE_LABEL
1449 && DECL_NONLOCAL (gimple_label_label (stmt
)))
1452 /* Examine the labels at the beginning of B. */
1453 for (gsi
= gsi_start_bb (b
); !gsi_end_p (gsi
); gsi_next (&gsi
))
1456 stmt
= gsi_stmt (gsi
);
1457 if (gimple_code (stmt
) != GIMPLE_LABEL
)
1459 lab
= gimple_label_label (stmt
);
1461 /* Do not remove user labels. */
1462 if (!DECL_ARTIFICIAL (lab
))
1466 /* Protect the loop latches. */
1467 if (current_loops
&& b
->loop_father
->latch
== b
)
1470 /* It must be possible to eliminate all phi nodes in B. If ssa form
1471 is not up-to-date and a name-mapping is registered, we cannot eliminate
1472 any phis. Symbols marked for renaming are never a problem though. */
1473 phis
= phi_nodes (b
);
1474 if (!gimple_seq_empty_p (phis
)
1475 && name_mappings_registered_p ())
1478 /* When not optimizing, don't merge if we'd lose goto_locus. */
1480 && single_succ_edge (a
)->goto_locus
!= UNKNOWN_LOCATION
)
1482 location_t goto_locus
= single_succ_edge (a
)->goto_locus
;
1483 gimple_stmt_iterator prev
, next
;
1484 prev
= gsi_last_nondebug_bb (a
);
1485 next
= gsi_after_labels (b
);
1486 if (!gsi_end_p (next
) && is_gimple_debug (gsi_stmt (next
)))
1487 gsi_next_nondebug (&next
);
1488 if ((gsi_end_p (prev
)
1489 || gimple_location (gsi_stmt (prev
)) != goto_locus
)
1490 && (gsi_end_p (next
)
1491 || gimple_location (gsi_stmt (next
)) != goto_locus
))
1498 /* Return true if the var whose chain of uses starts at PTR has no
1501 has_zero_uses_1 (const ssa_use_operand_t
*head
)
1503 const ssa_use_operand_t
*ptr
;
1505 for (ptr
= head
->next
; ptr
!= head
; ptr
= ptr
->next
)
1506 if (!is_gimple_debug (USE_STMT (ptr
)))
1512 /* Return true if the var whose chain of uses starts at PTR has a
1513 single nondebug use. Set USE_P and STMT to that single nondebug
1514 use, if so, or to NULL otherwise. */
1516 single_imm_use_1 (const ssa_use_operand_t
*head
,
1517 use_operand_p
*use_p
, gimple
*stmt
)
1519 ssa_use_operand_t
*ptr
, *single_use
= 0;
1521 for (ptr
= head
->next
; ptr
!= head
; ptr
= ptr
->next
)
1522 if (!is_gimple_debug (USE_STMT (ptr
)))
1533 *use_p
= single_use
;
1536 *stmt
= single_use
? single_use
->loc
.stmt
: NULL
;
1538 return !!single_use
;
1541 /* Replaces all uses of NAME by VAL. */
1544 replace_uses_by (tree name
, tree val
)
1546 imm_use_iterator imm_iter
;
1551 FOR_EACH_IMM_USE_STMT (stmt
, imm_iter
, name
)
1553 FOR_EACH_IMM_USE_ON_STMT (use
, imm_iter
)
1555 replace_exp (use
, val
);
1557 if (gimple_code (stmt
) == GIMPLE_PHI
)
1559 e
= gimple_phi_arg_edge (stmt
, PHI_ARG_INDEX_FROM_USE (use
));
1560 if (e
->flags
& EDGE_ABNORMAL
)
1562 /* This can only occur for virtual operands, since
1563 for the real ones SSA_NAME_OCCURS_IN_ABNORMAL_PHI (name))
1564 would prevent replacement. */
1565 gcc_assert (!is_gimple_reg (name
));
1566 SSA_NAME_OCCURS_IN_ABNORMAL_PHI (val
) = 1;
1571 if (gimple_code (stmt
) != GIMPLE_PHI
)
1575 fold_stmt_inplace (stmt
);
1576 if (cfgcleanup_altered_bbs
)
1577 bitmap_set_bit (cfgcleanup_altered_bbs
, gimple_bb (stmt
)->index
);
1579 /* FIXME. This should go in update_stmt. */
1580 for (i
= 0; i
< gimple_num_ops (stmt
); i
++)
1582 tree op
= gimple_op (stmt
, i
);
1583 /* Operands may be empty here. For example, the labels
1584 of a GIMPLE_COND are nulled out following the creation
1585 of the corresponding CFG edges. */
1586 if (op
&& TREE_CODE (op
) == ADDR_EXPR
)
1587 recompute_tree_invariant_for_addr_expr (op
);
1590 maybe_clean_or_replace_eh_stmt (stmt
, stmt
);
1595 gcc_assert (has_zero_uses (name
));
1597 /* Also update the trees stored in loop structures. */
1603 FOR_EACH_LOOP (li
, loop
, 0)
1605 substitute_in_loop_info (loop
, name
, val
);
1610 /* Merge block B into block A. */
1613 gimple_merge_blocks (basic_block a
, basic_block b
)
1615 gimple_stmt_iterator last
, gsi
, psi
;
1616 gimple_seq phis
= phi_nodes (b
);
1619 fprintf (dump_file
, "Merging blocks %d and %d\n", a
->index
, b
->index
);
1621 /* Remove all single-valued PHI nodes from block B of the form
1622 V_i = PHI <V_j> by propagating V_j to all the uses of V_i. */
1623 gsi
= gsi_last_bb (a
);
1624 for (psi
= gsi_start (phis
); !gsi_end_p (psi
); )
1626 gimple phi
= gsi_stmt (psi
);
1627 tree def
= gimple_phi_result (phi
), use
= gimple_phi_arg_def (phi
, 0);
1629 bool may_replace_uses
= !is_gimple_reg (def
)
1630 || may_propagate_copy (def
, use
);
1632 /* In case we maintain loop closed ssa form, do not propagate arguments
1633 of loop exit phi nodes. */
1635 && loops_state_satisfies_p (LOOP_CLOSED_SSA
)
1636 && is_gimple_reg (def
)
1637 && TREE_CODE (use
) == SSA_NAME
1638 && a
->loop_father
!= b
->loop_father
)
1639 may_replace_uses
= false;
1641 if (!may_replace_uses
)
1643 gcc_assert (is_gimple_reg (def
));
1645 /* Note that just emitting the copies is fine -- there is no problem
1646 with ordering of phi nodes. This is because A is the single
1647 predecessor of B, therefore results of the phi nodes cannot
1648 appear as arguments of the phi nodes. */
1649 copy
= gimple_build_assign (def
, use
);
1650 gsi_insert_after (&gsi
, copy
, GSI_NEW_STMT
);
1651 remove_phi_node (&psi
, false);
1655 /* If we deal with a PHI for virtual operands, we can simply
1656 propagate these without fussing with folding or updating
1658 if (!is_gimple_reg (def
))
1660 imm_use_iterator iter
;
1661 use_operand_p use_p
;
1664 FOR_EACH_IMM_USE_STMT (stmt
, iter
, def
)
1665 FOR_EACH_IMM_USE_ON_STMT (use_p
, iter
)
1666 SET_USE (use_p
, use
);
1668 if (SSA_NAME_OCCURS_IN_ABNORMAL_PHI (def
))
1669 SSA_NAME_OCCURS_IN_ABNORMAL_PHI (use
) = 1;
1672 replace_uses_by (def
, use
);
1674 remove_phi_node (&psi
, true);
1678 /* Ensure that B follows A. */
1679 move_block_after (b
, a
);
1681 gcc_assert (single_succ_edge (a
)->flags
& EDGE_FALLTHRU
);
1682 gcc_assert (!last_stmt (a
) || !stmt_ends_bb_p (last_stmt (a
)));
1684 /* Remove labels from B and set gimple_bb to A for other statements. */
1685 for (gsi
= gsi_start_bb (b
); !gsi_end_p (gsi
);)
1687 gimple stmt
= gsi_stmt (gsi
);
1688 if (gimple_code (stmt
) == GIMPLE_LABEL
)
1690 tree label
= gimple_label_label (stmt
);
1693 gsi_remove (&gsi
, false);
1695 /* Now that we can thread computed gotos, we might have
1696 a situation where we have a forced label in block B
1697 However, the label at the start of block B might still be
1698 used in other ways (think about the runtime checking for
1699 Fortran assigned gotos). So we can not just delete the
1700 label. Instead we move the label to the start of block A. */
1701 if (FORCED_LABEL (label
))
1703 gimple_stmt_iterator dest_gsi
= gsi_start_bb (a
);
1704 gsi_insert_before (&dest_gsi
, stmt
, GSI_NEW_STMT
);
1707 lp_nr
= EH_LANDING_PAD_NR (label
);
1710 eh_landing_pad lp
= get_eh_landing_pad_from_number (lp_nr
);
1711 lp
->post_landing_pad
= NULL
;
1716 gimple_set_bb (stmt
, a
);
1721 /* Merge the sequences. */
1722 last
= gsi_last_bb (a
);
1723 gsi_insert_seq_after (&last
, bb_seq (b
), GSI_NEW_STMT
);
1724 set_bb_seq (b
, NULL
);
1726 if (cfgcleanup_altered_bbs
)
1727 bitmap_set_bit (cfgcleanup_altered_bbs
, a
->index
);
1731 /* Return the one of two successors of BB that is not reachable by a
1732 complex edge, if there is one. Else, return BB. We use
1733 this in optimizations that use post-dominators for their heuristics,
1734 to catch the cases in C++ where function calls are involved. */
1737 single_noncomplex_succ (basic_block bb
)
1740 if (EDGE_COUNT (bb
->succs
) != 2)
1743 e0
= EDGE_SUCC (bb
, 0);
1744 e1
= EDGE_SUCC (bb
, 1);
1745 if (e0
->flags
& EDGE_COMPLEX
)
1747 if (e1
->flags
& EDGE_COMPLEX
)
1753 /* T is CALL_EXPR. Set current_function_calls_* flags. */
1756 notice_special_calls (gimple call
)
1758 int flags
= gimple_call_flags (call
);
1760 if (flags
& ECF_MAY_BE_ALLOCA
)
1761 cfun
->calls_alloca
= true;
1762 if (flags
& ECF_RETURNS_TWICE
)
1763 cfun
->calls_setjmp
= true;
1767 /* Clear flags set by notice_special_calls. Used by dead code removal
1768 to update the flags. */
1771 clear_special_calls (void)
1773 cfun
->calls_alloca
= false;
1774 cfun
->calls_setjmp
= false;
1777 /* Remove PHI nodes associated with basic block BB and all edges out of BB. */
1780 remove_phi_nodes_and_edges_for_unreachable_block (basic_block bb
)
1782 /* Since this block is no longer reachable, we can just delete all
1783 of its PHI nodes. */
1784 remove_phi_nodes (bb
);
1786 /* Remove edges to BB's successors. */
1787 while (EDGE_COUNT (bb
->succs
) > 0)
1788 remove_edge (EDGE_SUCC (bb
, 0));
1792 /* Remove statements of basic block BB. */
1795 remove_bb (basic_block bb
)
1797 gimple_stmt_iterator i
;
1801 fprintf (dump_file
, "Removing basic block %d\n", bb
->index
);
1802 if (dump_flags
& TDF_DETAILS
)
1804 dump_bb (bb
, dump_file
, 0);
1805 fprintf (dump_file
, "\n");
1811 struct loop
*loop
= bb
->loop_father
;
1813 /* If a loop gets removed, clean up the information associated
1815 if (loop
->latch
== bb
1816 || loop
->header
== bb
)
1817 free_numbers_of_iterations_estimates_loop (loop
);
1820 /* Remove all the instructions in the block. */
1821 if (bb_seq (bb
) != NULL
)
1823 /* Walk backwards so as to get a chance to substitute all
1824 released DEFs into debug stmts. See
1825 eliminate_unnecessary_stmts() in tree-ssa-dce.c for more
1827 for (i
= gsi_last_bb (bb
); !gsi_end_p (i
);)
1829 gimple stmt
= gsi_stmt (i
);
1830 if (gimple_code (stmt
) == GIMPLE_LABEL
1831 && (FORCED_LABEL (gimple_label_label (stmt
))
1832 || DECL_NONLOCAL (gimple_label_label (stmt
))))
1835 gimple_stmt_iterator new_gsi
;
1837 /* A non-reachable non-local label may still be referenced.
1838 But it no longer needs to carry the extra semantics of
1840 if (DECL_NONLOCAL (gimple_label_label (stmt
)))
1842 DECL_NONLOCAL (gimple_label_label (stmt
)) = 0;
1843 FORCED_LABEL (gimple_label_label (stmt
)) = 1;
1846 new_bb
= bb
->prev_bb
;
1847 new_gsi
= gsi_start_bb (new_bb
);
1848 gsi_remove (&i
, false);
1849 gsi_insert_before (&new_gsi
, stmt
, GSI_NEW_STMT
);
1853 /* Release SSA definitions if we are in SSA. Note that we
1854 may be called when not in SSA. For example,
1855 final_cleanup calls this function via
1856 cleanup_tree_cfg. */
1857 if (gimple_in_ssa_p (cfun
))
1858 release_defs (stmt
);
1860 gsi_remove (&i
, true);
1864 i
= gsi_last_bb (bb
);
1870 remove_phi_nodes_and_edges_for_unreachable_block (bb
);
1871 bb
->il
.gimple
= NULL
;
1875 /* Given a basic block BB ending with COND_EXPR or SWITCH_EXPR, and a
1876 predicate VAL, return the edge that will be taken out of the block.
1877 If VAL does not match a unique edge, NULL is returned. */
1880 find_taken_edge (basic_block bb
, tree val
)
1884 stmt
= last_stmt (bb
);
1887 gcc_assert (is_ctrl_stmt (stmt
));
1892 if (!is_gimple_min_invariant (val
))
1895 if (gimple_code (stmt
) == GIMPLE_COND
)
1896 return find_taken_edge_cond_expr (bb
, val
);
1898 if (gimple_code (stmt
) == GIMPLE_SWITCH
)
1899 return find_taken_edge_switch_expr (bb
, val
);
1901 if (computed_goto_p (stmt
))
1903 /* Only optimize if the argument is a label, if the argument is
1904 not a label then we can not construct a proper CFG.
1906 It may be the case that we only need to allow the LABEL_REF to
1907 appear inside an ADDR_EXPR, but we also allow the LABEL_REF to
1908 appear inside a LABEL_EXPR just to be safe. */
1909 if ((TREE_CODE (val
) == ADDR_EXPR
|| TREE_CODE (val
) == LABEL_EXPR
)
1910 && TREE_CODE (TREE_OPERAND (val
, 0)) == LABEL_DECL
)
1911 return find_taken_edge_computed_goto (bb
, TREE_OPERAND (val
, 0));
1918 /* Given a constant value VAL and the entry block BB to a GOTO_EXPR
1919 statement, determine which of the outgoing edges will be taken out of the
1920 block. Return NULL if either edge may be taken. */
1923 find_taken_edge_computed_goto (basic_block bb
, tree val
)
1928 dest
= label_to_block (val
);
1931 e
= find_edge (bb
, dest
);
1932 gcc_assert (e
!= NULL
);
1938 /* Given a constant value VAL and the entry block BB to a COND_EXPR
1939 statement, determine which of the two edges will be taken out of the
1940 block. Return NULL if either edge may be taken. */
1943 find_taken_edge_cond_expr (basic_block bb
, tree val
)
1945 edge true_edge
, false_edge
;
1947 extract_true_false_edges_from_block (bb
, &true_edge
, &false_edge
);
1949 gcc_assert (TREE_CODE (val
) == INTEGER_CST
);
1950 return (integer_zerop (val
) ? false_edge
: true_edge
);
1953 /* Given an INTEGER_CST VAL and the entry block BB to a SWITCH_EXPR
1954 statement, determine which edge will be taken out of the block. Return
1955 NULL if any edge may be taken. */
1958 find_taken_edge_switch_expr (basic_block bb
, tree val
)
1960 basic_block dest_bb
;
1965 switch_stmt
= last_stmt (bb
);
1966 taken_case
= find_case_label_for_value (switch_stmt
, val
);
1967 dest_bb
= label_to_block (CASE_LABEL (taken_case
));
1969 e
= find_edge (bb
, dest_bb
);
1975 /* Return the CASE_LABEL_EXPR that SWITCH_STMT will take for VAL.
1976 We can make optimal use here of the fact that the case labels are
1977 sorted: We can do a binary search for a case matching VAL. */
1980 find_case_label_for_value (gimple switch_stmt
, tree val
)
1982 size_t low
, high
, n
= gimple_switch_num_labels (switch_stmt
);
1983 tree default_case
= gimple_switch_default_label (switch_stmt
);
1985 for (low
= 0, high
= n
; high
- low
> 1; )
1987 size_t i
= (high
+ low
) / 2;
1988 tree t
= gimple_switch_label (switch_stmt
, i
);
1991 /* Cache the result of comparing CASE_LOW and val. */
1992 cmp
= tree_int_cst_compare (CASE_LOW (t
), val
);
1999 if (CASE_HIGH (t
) == NULL
)
2001 /* A singe-valued case label. */
2007 /* A case range. We can only handle integer ranges. */
2008 if (cmp
<= 0 && tree_int_cst_compare (CASE_HIGH (t
), val
) >= 0)
2013 return default_case
;
2017 /* Dump a basic block on stderr. */
2020 gimple_debug_bb (basic_block bb
)
2022 gimple_dump_bb (bb
, stderr
, 0, TDF_VOPS
|TDF_MEMSYMS
);
2026 /* Dump basic block with index N on stderr. */
2029 gimple_debug_bb_n (int n
)
2031 gimple_debug_bb (BASIC_BLOCK (n
));
2032 return BASIC_BLOCK (n
);
2036 /* Dump the CFG on stderr.
2038 FLAGS are the same used by the tree dumping functions
2039 (see TDF_* in tree-pass.h). */
2042 gimple_debug_cfg (int flags
)
2044 gimple_dump_cfg (stderr
, flags
);
2048 /* Dump the program showing basic block boundaries on the given FILE.
2050 FLAGS are the same used by the tree dumping functions (see TDF_* in
2054 gimple_dump_cfg (FILE *file
, int flags
)
2056 if (flags
& TDF_DETAILS
)
2058 const char *funcname
2059 = lang_hooks
.decl_printable_name (current_function_decl
, 2);
2062 fprintf (file
, ";; Function %s\n\n", funcname
);
2063 fprintf (file
, ";; \n%d basic blocks, %d edges, last basic block %d.\n\n",
2064 n_basic_blocks
, n_edges
, last_basic_block
);
2066 brief_dump_cfg (file
);
2067 fprintf (file
, "\n");
2070 if (flags
& TDF_STATS
)
2071 dump_cfg_stats (file
);
2073 dump_function_to_file (current_function_decl
, file
, flags
| TDF_BLOCKS
);
2077 /* Dump CFG statistics on FILE. */
2080 dump_cfg_stats (FILE *file
)
2082 static long max_num_merged_labels
= 0;
2083 unsigned long size
, total
= 0;
2086 const char * const fmt_str
= "%-30s%-13s%12s\n";
2087 const char * const fmt_str_1
= "%-30s%13d%11lu%c\n";
2088 const char * const fmt_str_2
= "%-30s%13ld%11lu%c\n";
2089 const char * const fmt_str_3
= "%-43s%11lu%c\n";
2090 const char *funcname
2091 = lang_hooks
.decl_printable_name (current_function_decl
, 2);
2094 fprintf (file
, "\nCFG Statistics for %s\n\n", funcname
);
2096 fprintf (file
, "---------------------------------------------------------\n");
2097 fprintf (file
, fmt_str
, "", " Number of ", "Memory");
2098 fprintf (file
, fmt_str
, "", " instances ", "used ");
2099 fprintf (file
, "---------------------------------------------------------\n");
2101 size
= n_basic_blocks
* sizeof (struct basic_block_def
);
2103 fprintf (file
, fmt_str_1
, "Basic blocks", n_basic_blocks
,
2104 SCALE (size
), LABEL (size
));
2108 num_edges
+= EDGE_COUNT (bb
->succs
);
2109 size
= num_edges
* sizeof (struct edge_def
);
2111 fprintf (file
, fmt_str_2
, "Edges", num_edges
, SCALE (size
), LABEL (size
));
2113 fprintf (file
, "---------------------------------------------------------\n");
2114 fprintf (file
, fmt_str_3
, "Total memory used by CFG data", SCALE (total
),
2116 fprintf (file
, "---------------------------------------------------------\n");
2117 fprintf (file
, "\n");
2119 if (cfg_stats
.num_merged_labels
> max_num_merged_labels
)
2120 max_num_merged_labels
= cfg_stats
.num_merged_labels
;
2122 fprintf (file
, "Coalesced label blocks: %ld (Max so far: %ld)\n",
2123 cfg_stats
.num_merged_labels
, max_num_merged_labels
);
2125 fprintf (file
, "\n");
2129 /* Dump CFG statistics on stderr. Keep extern so that it's always
2130 linked in the final executable. */
2133 debug_cfg_stats (void)
2135 dump_cfg_stats (stderr
);
2139 /* Dump the flowgraph to a .vcg FILE. */
2142 gimple_cfg2vcg (FILE *file
)
2147 const char *funcname
2148 = lang_hooks
.decl_printable_name (current_function_decl
, 2);
2150 /* Write the file header. */
2151 fprintf (file
, "graph: { title: \"%s\"\n", funcname
);
2152 fprintf (file
, "node: { title: \"ENTRY\" label: \"ENTRY\" }\n");
2153 fprintf (file
, "node: { title: \"EXIT\" label: \"EXIT\" }\n");
2155 /* Write blocks and edges. */
2156 FOR_EACH_EDGE (e
, ei
, ENTRY_BLOCK_PTR
->succs
)
2158 fprintf (file
, "edge: { sourcename: \"ENTRY\" targetname: \"%d\"",
2161 if (e
->flags
& EDGE_FAKE
)
2162 fprintf (file
, " linestyle: dotted priority: 10");
2164 fprintf (file
, " linestyle: solid priority: 100");
2166 fprintf (file
, " }\n");
2172 enum gimple_code head_code
, end_code
;
2173 const char *head_name
, *end_name
;
2176 gimple first
= first_stmt (bb
);
2177 gimple last
= last_stmt (bb
);
2181 head_code
= gimple_code (first
);
2182 head_name
= gimple_code_name
[head_code
];
2183 head_line
= get_lineno (first
);
2186 head_name
= "no-statement";
2190 end_code
= gimple_code (last
);
2191 end_name
= gimple_code_name
[end_code
];
2192 end_line
= get_lineno (last
);
2195 end_name
= "no-statement";
2197 fprintf (file
, "node: { title: \"%d\" label: \"#%d\\n%s (%d)\\n%s (%d)\"}\n",
2198 bb
->index
, bb
->index
, head_name
, head_line
, end_name
,
2201 FOR_EACH_EDGE (e
, ei
, bb
->succs
)
2203 if (e
->dest
== EXIT_BLOCK_PTR
)
2204 fprintf (file
, "edge: { sourcename: \"%d\" targetname: \"EXIT\"", bb
->index
);
2206 fprintf (file
, "edge: { sourcename: \"%d\" targetname: \"%d\"", bb
->index
, e
->dest
->index
);
2208 if (e
->flags
& EDGE_FAKE
)
2209 fprintf (file
, " priority: 10 linestyle: dotted");
2211 fprintf (file
, " priority: 100 linestyle: solid");
2213 fprintf (file
, " }\n");
2216 if (bb
->next_bb
!= EXIT_BLOCK_PTR
)
2220 fputs ("}\n\n", file
);
2225 /*---------------------------------------------------------------------------
2226 Miscellaneous helpers
2227 ---------------------------------------------------------------------------*/
2229 /* Return true if T represents a stmt that always transfers control. */
2232 is_ctrl_stmt (gimple t
)
2234 switch (gimple_code (t
))
2248 /* Return true if T is a statement that may alter the flow of control
2249 (e.g., a call to a non-returning function). */
2252 is_ctrl_altering_stmt (gimple t
)
2256 switch (gimple_code (t
))
2260 int flags
= gimple_call_flags (t
);
2262 /* A non-pure/const call alters flow control if the current
2263 function has nonlocal labels. */
2264 if (!(flags
& (ECF_CONST
| ECF_PURE
)) && cfun
->has_nonlocal_label
)
2267 /* A call also alters control flow if it does not return. */
2268 if (flags
& ECF_NORETURN
)
2271 /* BUILT_IN_RETURN call is same as return statement. */
2272 if (gimple_call_builtin_p (t
, BUILT_IN_RETURN
))
2277 case GIMPLE_EH_DISPATCH
:
2278 /* EH_DISPATCH branches to the individual catch handlers at
2279 this level of a try or allowed-exceptions region. It can
2280 fallthru to the next statement as well. */
2284 if (gimple_asm_nlabels (t
) > 0)
2289 /* OpenMP directives alter control flow. */
2296 /* If a statement can throw, it alters control flow. */
2297 return stmt_can_throw_internal (t
);
2301 /* Return true if T is a simple local goto. */
2304 simple_goto_p (gimple t
)
2306 return (gimple_code (t
) == GIMPLE_GOTO
2307 && TREE_CODE (gimple_goto_dest (t
)) == LABEL_DECL
);
2311 /* Return true if T can make an abnormal transfer of control flow.
2312 Transfers of control flow associated with EH are excluded. */
2315 stmt_can_make_abnormal_goto (gimple t
)
2317 if (computed_goto_p (t
))
2319 if (is_gimple_call (t
))
2320 return gimple_has_side_effects (t
) && cfun
->has_nonlocal_label
;
2325 /* Return true if STMT should start a new basic block. PREV_STMT is
2326 the statement preceding STMT. It is used when STMT is a label or a
2327 case label. Labels should only start a new basic block if their
2328 previous statement wasn't a label. Otherwise, sequence of labels
2329 would generate unnecessary basic blocks that only contain a single
2333 stmt_starts_bb_p (gimple stmt
, gimple prev_stmt
)
2338 /* Labels start a new basic block only if the preceding statement
2339 wasn't a label of the same type. This prevents the creation of
2340 consecutive blocks that have nothing but a single label. */
2341 if (gimple_code (stmt
) == GIMPLE_LABEL
)
2343 /* Nonlocal and computed GOTO targets always start a new block. */
2344 if (DECL_NONLOCAL (gimple_label_label (stmt
))
2345 || FORCED_LABEL (gimple_label_label (stmt
)))
2348 if (prev_stmt
&& gimple_code (prev_stmt
) == GIMPLE_LABEL
)
2350 if (DECL_NONLOCAL (gimple_label_label (prev_stmt
)))
2353 cfg_stats
.num_merged_labels
++;
2364 /* Return true if T should end a basic block. */
2367 stmt_ends_bb_p (gimple t
)
2369 return is_ctrl_stmt (t
) || is_ctrl_altering_stmt (t
);
2372 /* Remove block annotations and other data structures. */
2375 delete_tree_cfg_annotations (void)
2377 label_to_block_map
= NULL
;
2381 /* Return the first statement in basic block BB. */
2384 first_stmt (basic_block bb
)
2386 gimple_stmt_iterator i
= gsi_start_bb (bb
);
2389 while (!gsi_end_p (i
) && is_gimple_debug ((stmt
= gsi_stmt (i
))))
2397 /* Return the first non-label statement in basic block BB. */
2400 first_non_label_stmt (basic_block bb
)
2402 gimple_stmt_iterator i
= gsi_start_bb (bb
);
2403 while (!gsi_end_p (i
) && gimple_code (gsi_stmt (i
)) == GIMPLE_LABEL
)
2405 return !gsi_end_p (i
) ? gsi_stmt (i
) : NULL
;
2408 /* Return the last statement in basic block BB. */
2411 last_stmt (basic_block bb
)
2413 gimple_stmt_iterator i
= gsi_last_bb (bb
);
2416 while (!gsi_end_p (i
) && is_gimple_debug ((stmt
= gsi_stmt (i
))))
2424 /* Return the last statement of an otherwise empty block. Return NULL
2425 if the block is totally empty, or if it contains more than one
2429 last_and_only_stmt (basic_block bb
)
2431 gimple_stmt_iterator i
= gsi_last_nondebug_bb (bb
);
2437 last
= gsi_stmt (i
);
2438 gsi_prev_nondebug (&i
);
2442 /* Empty statements should no longer appear in the instruction stream.
2443 Everything that might have appeared before should be deleted by
2444 remove_useless_stmts, and the optimizers should just gsi_remove
2445 instead of smashing with build_empty_stmt.
2447 Thus the only thing that should appear here in a block containing
2448 one executable statement is a label. */
2449 prev
= gsi_stmt (i
);
2450 if (gimple_code (prev
) == GIMPLE_LABEL
)
2456 /* Reinstall those PHI arguments queued in OLD_EDGE to NEW_EDGE. */
2459 reinstall_phi_args (edge new_edge
, edge old_edge
)
2461 edge_var_map_vector v
;
2464 gimple_stmt_iterator phis
;
2466 v
= redirect_edge_var_map_vector (old_edge
);
2470 for (i
= 0, phis
= gsi_start_phis (new_edge
->dest
);
2471 VEC_iterate (edge_var_map
, v
, i
, vm
) && !gsi_end_p (phis
);
2472 i
++, gsi_next (&phis
))
2474 gimple phi
= gsi_stmt (phis
);
2475 tree result
= redirect_edge_var_map_result (vm
);
2476 tree arg
= redirect_edge_var_map_def (vm
);
2478 gcc_assert (result
== gimple_phi_result (phi
));
2480 add_phi_arg (phi
, arg
, new_edge
, redirect_edge_var_map_location (vm
));
2483 redirect_edge_var_map_clear (old_edge
);
2486 /* Returns the basic block after which the new basic block created
2487 by splitting edge EDGE_IN should be placed. Tries to keep the new block
2488 near its "logical" location. This is of most help to humans looking
2489 at debugging dumps. */
2492 split_edge_bb_loc (edge edge_in
)
2494 basic_block dest
= edge_in
->dest
;
2495 basic_block dest_prev
= dest
->prev_bb
;
2499 edge e
= find_edge (dest_prev
, dest
);
2500 if (e
&& !(e
->flags
& EDGE_COMPLEX
))
2501 return edge_in
->src
;
2506 /* Split a (typically critical) edge EDGE_IN. Return the new block.
2507 Abort on abnormal edges. */
2510 gimple_split_edge (edge edge_in
)
2512 basic_block new_bb
, after_bb
, dest
;
2515 /* Abnormal edges cannot be split. */
2516 gcc_assert (!(edge_in
->flags
& EDGE_ABNORMAL
));
2518 dest
= edge_in
->dest
;
2520 after_bb
= split_edge_bb_loc (edge_in
);
2522 new_bb
= create_empty_bb (after_bb
);
2523 new_bb
->frequency
= EDGE_FREQUENCY (edge_in
);
2524 new_bb
->count
= edge_in
->count
;
2525 new_edge
= make_edge (new_bb
, dest
, EDGE_FALLTHRU
);
2526 new_edge
->probability
= REG_BR_PROB_BASE
;
2527 new_edge
->count
= edge_in
->count
;
2529 e
= redirect_edge_and_branch (edge_in
, new_bb
);
2530 gcc_assert (e
== edge_in
);
2531 reinstall_phi_args (new_edge
, e
);
2536 /* Callback for walk_tree, check that all elements with address taken are
2537 properly noticed as such. The DATA is an int* that is 1 if TP was seen
2538 inside a PHI node. */
2541 verify_expr (tree
*tp
, int *walk_subtrees
, void *data ATTRIBUTE_UNUSED
)
2548 /* Check operand N for being valid GIMPLE and give error MSG if not. */
2549 #define CHECK_OP(N, MSG) \
2550 do { if (!is_gimple_val (TREE_OPERAND (t, N))) \
2551 { error (MSG); return TREE_OPERAND (t, N); }} while (0)
2553 switch (TREE_CODE (t
))
2556 if (SSA_NAME_IN_FREE_LIST (t
))
2558 error ("SSA name in freelist but still referenced");
2564 x
= TREE_OPERAND (t
, 0);
2565 if (!is_gimple_reg (x
) && !is_gimple_min_invariant (x
))
2567 error ("Indirect reference's operand is not a register or a constant.");
2573 x
= fold (ASSERT_EXPR_COND (t
));
2574 if (x
== boolean_false_node
)
2576 error ("ASSERT_EXPR with an always-false condition");
2582 error ("MODIFY_EXPR not expected while having tuples.");
2588 bool old_side_effects
;
2590 bool new_side_effects
;
2592 gcc_assert (is_gimple_address (t
));
2594 old_constant
= TREE_CONSTANT (t
);
2595 old_side_effects
= TREE_SIDE_EFFECTS (t
);
2597 recompute_tree_invariant_for_addr_expr (t
);
2598 new_side_effects
= TREE_SIDE_EFFECTS (t
);
2599 new_constant
= TREE_CONSTANT (t
);
2601 if (old_constant
!= new_constant
)
2603 error ("constant not recomputed when ADDR_EXPR changed");
2606 if (old_side_effects
!= new_side_effects
)
2608 error ("side effects not recomputed when ADDR_EXPR changed");
2612 /* Skip any references (they will be checked when we recurse down the
2613 tree) and ensure that any variable used as a prefix is marked
2615 for (x
= TREE_OPERAND (t
, 0);
2616 handled_component_p (x
);
2617 x
= TREE_OPERAND (x
, 0))
2620 if (!(TREE_CODE (x
) == VAR_DECL
2621 || TREE_CODE (x
) == PARM_DECL
2622 || TREE_CODE (x
) == RESULT_DECL
))
2624 if (!TREE_ADDRESSABLE (x
))
2626 error ("address taken, but ADDRESSABLE bit not set");
2629 if (DECL_GIMPLE_REG_P (x
))
2631 error ("DECL_GIMPLE_REG_P set on a variable with address taken");
2639 x
= COND_EXPR_COND (t
);
2640 if (!INTEGRAL_TYPE_P (TREE_TYPE (x
)))
2642 error ("non-integral used in condition");
2645 if (!is_gimple_condexpr (x
))
2647 error ("invalid conditional operand");
2652 case NON_LVALUE_EXPR
:
2656 case FIX_TRUNC_EXPR
:
2661 case TRUTH_NOT_EXPR
:
2662 CHECK_OP (0, "invalid operand to unary operator");
2669 case ARRAY_RANGE_REF
:
2671 case VIEW_CONVERT_EXPR
:
2672 /* We have a nest of references. Verify that each of the operands
2673 that determine where to reference is either a constant or a variable,
2674 verify that the base is valid, and then show we've already checked
2676 while (handled_component_p (t
))
2678 if (TREE_CODE (t
) == COMPONENT_REF
&& TREE_OPERAND (t
, 2))
2679 CHECK_OP (2, "invalid COMPONENT_REF offset operator");
2680 else if (TREE_CODE (t
) == ARRAY_REF
2681 || TREE_CODE (t
) == ARRAY_RANGE_REF
)
2683 CHECK_OP (1, "invalid array index");
2684 if (TREE_OPERAND (t
, 2))
2685 CHECK_OP (2, "invalid array lower bound");
2686 if (TREE_OPERAND (t
, 3))
2687 CHECK_OP (3, "invalid array stride");
2689 else if (TREE_CODE (t
) == BIT_FIELD_REF
)
2691 if (!host_integerp (TREE_OPERAND (t
, 1), 1)
2692 || !host_integerp (TREE_OPERAND (t
, 2), 1))
2694 error ("invalid position or size operand to BIT_FIELD_REF");
2697 else if (INTEGRAL_TYPE_P (TREE_TYPE (t
))
2698 && (TYPE_PRECISION (TREE_TYPE (t
))
2699 != TREE_INT_CST_LOW (TREE_OPERAND (t
, 1))))
2701 error ("integral result type precision does not match "
2702 "field size of BIT_FIELD_REF");
2705 if (!INTEGRAL_TYPE_P (TREE_TYPE (t
))
2706 && (GET_MODE_PRECISION (TYPE_MODE (TREE_TYPE (t
)))
2707 != TREE_INT_CST_LOW (TREE_OPERAND (t
, 1))))
2709 error ("mode precision of non-integral result does not "
2710 "match field size of BIT_FIELD_REF");
2715 t
= TREE_OPERAND (t
, 0);
2718 if (!is_gimple_min_invariant (t
) && !is_gimple_lvalue (t
))
2720 error ("invalid reference prefix");
2727 /* PLUS_EXPR and MINUS_EXPR don't work on pointers, they should be done using
2728 POINTER_PLUS_EXPR. */
2729 if (POINTER_TYPE_P (TREE_TYPE (t
)))
2731 error ("invalid operand to plus/minus, type is a pointer");
2734 CHECK_OP (0, "invalid operand to binary operator");
2735 CHECK_OP (1, "invalid operand to binary operator");
2738 case POINTER_PLUS_EXPR
:
2739 /* Check to make sure the first operand is a pointer or reference type. */
2740 if (!POINTER_TYPE_P (TREE_TYPE (TREE_OPERAND (t
, 0))))
2742 error ("invalid operand to pointer plus, first operand is not a pointer");
2745 /* Check to make sure the second operand is an integer with type of
2747 if (!useless_type_conversion_p (sizetype
,
2748 TREE_TYPE (TREE_OPERAND (t
, 1))))
2750 error ("invalid operand to pointer plus, second operand is not an "
2751 "integer with type of sizetype.");
2761 case UNORDERED_EXPR
:
2770 case TRUNC_DIV_EXPR
:
2772 case FLOOR_DIV_EXPR
:
2773 case ROUND_DIV_EXPR
:
2774 case TRUNC_MOD_EXPR
:
2776 case FLOOR_MOD_EXPR
:
2777 case ROUND_MOD_EXPR
:
2779 case EXACT_DIV_EXPR
:
2789 CHECK_OP (0, "invalid operand to binary operator");
2790 CHECK_OP (1, "invalid operand to binary operator");
2794 if (TREE_CONSTANT (t
) && TREE_CODE (TREE_TYPE (t
)) == VECTOR_TYPE
)
2807 /* Verify if EXPR is either a GIMPLE ID or a GIMPLE indirect reference.
2808 Returns true if there is an error, otherwise false. */
2811 verify_types_in_gimple_min_lval (tree expr
)
2815 if (is_gimple_id (expr
))
2818 if (!INDIRECT_REF_P (expr
)
2819 && TREE_CODE (expr
) != TARGET_MEM_REF
)
2821 error ("invalid expression for min lvalue");
2825 /* TARGET_MEM_REFs are strange beasts. */
2826 if (TREE_CODE (expr
) == TARGET_MEM_REF
)
2829 op
= TREE_OPERAND (expr
, 0);
2830 if (!is_gimple_val (op
))
2832 error ("invalid operand in indirect reference");
2833 debug_generic_stmt (op
);
2836 if (!useless_type_conversion_p (TREE_TYPE (expr
),
2837 TREE_TYPE (TREE_TYPE (op
))))
2839 error ("type mismatch in indirect reference");
2840 debug_generic_stmt (TREE_TYPE (expr
));
2841 debug_generic_stmt (TREE_TYPE (TREE_TYPE (op
)));
2848 /* Verify if EXPR is a valid GIMPLE reference expression. If
2849 REQUIRE_LVALUE is true verifies it is an lvalue. Returns true
2850 if there is an error, otherwise false. */
2853 verify_types_in_gimple_reference (tree expr
, bool require_lvalue
)
2855 while (handled_component_p (expr
))
2857 tree op
= TREE_OPERAND (expr
, 0);
2859 if (TREE_CODE (expr
) == ARRAY_REF
2860 || TREE_CODE (expr
) == ARRAY_RANGE_REF
)
2862 if (!is_gimple_val (TREE_OPERAND (expr
, 1))
2863 || (TREE_OPERAND (expr
, 2)
2864 && !is_gimple_val (TREE_OPERAND (expr
, 2)))
2865 || (TREE_OPERAND (expr
, 3)
2866 && !is_gimple_val (TREE_OPERAND (expr
, 3))))
2868 error ("invalid operands to array reference");
2869 debug_generic_stmt (expr
);
2874 /* Verify if the reference array element types are compatible. */
2875 if (TREE_CODE (expr
) == ARRAY_REF
2876 && !useless_type_conversion_p (TREE_TYPE (expr
),
2877 TREE_TYPE (TREE_TYPE (op
))))
2879 error ("type mismatch in array reference");
2880 debug_generic_stmt (TREE_TYPE (expr
));
2881 debug_generic_stmt (TREE_TYPE (TREE_TYPE (op
)));
2884 if (TREE_CODE (expr
) == ARRAY_RANGE_REF
2885 && !useless_type_conversion_p (TREE_TYPE (TREE_TYPE (expr
)),
2886 TREE_TYPE (TREE_TYPE (op
))))
2888 error ("type mismatch in array range reference");
2889 debug_generic_stmt (TREE_TYPE (TREE_TYPE (expr
)));
2890 debug_generic_stmt (TREE_TYPE (TREE_TYPE (op
)));
2894 if ((TREE_CODE (expr
) == REALPART_EXPR
2895 || TREE_CODE (expr
) == IMAGPART_EXPR
)
2896 && !useless_type_conversion_p (TREE_TYPE (expr
),
2897 TREE_TYPE (TREE_TYPE (op
))))
2899 error ("type mismatch in real/imagpart reference");
2900 debug_generic_stmt (TREE_TYPE (expr
));
2901 debug_generic_stmt (TREE_TYPE (TREE_TYPE (op
)));
2905 if (TREE_CODE (expr
) == COMPONENT_REF
2906 && !useless_type_conversion_p (TREE_TYPE (expr
),
2907 TREE_TYPE (TREE_OPERAND (expr
, 1))))
2909 error ("type mismatch in component reference");
2910 debug_generic_stmt (TREE_TYPE (expr
));
2911 debug_generic_stmt (TREE_TYPE (TREE_OPERAND (expr
, 1)));
2915 if (TREE_CODE (expr
) == VIEW_CONVERT_EXPR
)
2917 /* For VIEW_CONVERT_EXPRs which are allowed here too, we only check
2918 that their operand is not an SSA name or an invariant when
2919 requiring an lvalue (this usually means there is a SRA or IPA-SRA
2920 bug). Otherwise there is nothing to verify, gross mismatches at
2921 most invoke undefined behavior. */
2923 && (TREE_CODE (op
) == SSA_NAME
2924 || is_gimple_min_invariant (op
)))
2926 error ("Conversion of an SSA_NAME on the left hand side.");
2927 debug_generic_stmt (expr
);
2930 else if (!handled_component_p (op
))
2937 return ((require_lvalue
|| !is_gimple_min_invariant (expr
))
2938 && verify_types_in_gimple_min_lval (expr
));
2941 /* Returns true if there is one pointer type in TYPE_POINTER_TO (SRC_OBJ)
2942 list of pointer-to types that is trivially convertible to DEST. */
2945 one_pointer_to_useless_type_conversion_p (tree dest
, tree src_obj
)
2949 if (!TYPE_POINTER_TO (src_obj
))
2952 for (src
= TYPE_POINTER_TO (src_obj
); src
; src
= TYPE_NEXT_PTR_TO (src
))
2953 if (useless_type_conversion_p (dest
, src
))
2959 /* Return true if TYPE1 is a fixed-point type and if conversions to and
2960 from TYPE2 can be handled by FIXED_CONVERT_EXPR. */
2963 valid_fixed_convert_types_p (tree type1
, tree type2
)
2965 return (FIXED_POINT_TYPE_P (type1
)
2966 && (INTEGRAL_TYPE_P (type2
)
2967 || SCALAR_FLOAT_TYPE_P (type2
)
2968 || FIXED_POINT_TYPE_P (type2
)));
2971 /* Verify the contents of a GIMPLE_CALL STMT. Returns true when there
2972 is a problem, otherwise false. */
2975 verify_gimple_call (gimple stmt
)
2977 tree fn
= gimple_call_fn (stmt
);
2981 if (TREE_CODE (fn
) != OBJ_TYPE_REF
2982 && !is_gimple_val (fn
))
2984 error ("invalid function in gimple call");
2985 debug_generic_stmt (fn
);
2989 if (!POINTER_TYPE_P (TREE_TYPE (fn
))
2990 || (TREE_CODE (TREE_TYPE (TREE_TYPE (fn
))) != FUNCTION_TYPE
2991 && TREE_CODE (TREE_TYPE (TREE_TYPE (fn
))) != METHOD_TYPE
))
2993 error ("non-function in gimple call");
2997 if (gimple_call_lhs (stmt
)
2998 && (!is_gimple_lvalue (gimple_call_lhs (stmt
))
2999 || verify_types_in_gimple_reference (gimple_call_lhs (stmt
), true)))
3001 error ("invalid LHS in gimple call");
3005 if (gimple_call_lhs (stmt
) && gimple_call_noreturn_p (stmt
))
3007 error ("LHS in noreturn call");
3011 fntype
= TREE_TYPE (TREE_TYPE (fn
));
3012 if (gimple_call_lhs (stmt
)
3013 && !useless_type_conversion_p (TREE_TYPE (gimple_call_lhs (stmt
)),
3015 /* ??? At least C++ misses conversions at assignments from
3016 void * call results.
3017 ??? Java is completely off. Especially with functions
3018 returning java.lang.Object.
3019 For now simply allow arbitrary pointer type conversions. */
3020 && !(POINTER_TYPE_P (TREE_TYPE (gimple_call_lhs (stmt
)))
3021 && POINTER_TYPE_P (TREE_TYPE (fntype
))))
3023 error ("invalid conversion in gimple call");
3024 debug_generic_stmt (TREE_TYPE (gimple_call_lhs (stmt
)));
3025 debug_generic_stmt (TREE_TYPE (fntype
));
3029 if (gimple_call_chain (stmt
)
3030 && !is_gimple_val (gimple_call_chain (stmt
)))
3032 error ("invalid static chain in gimple call");
3033 debug_generic_stmt (gimple_call_chain (stmt
));
3037 /* If there is a static chain argument, this should not be an indirect
3038 call, and the decl should have DECL_STATIC_CHAIN set. */
3039 if (gimple_call_chain (stmt
))
3041 if (TREE_CODE (fn
) != ADDR_EXPR
3042 || TREE_CODE (TREE_OPERAND (fn
, 0)) != FUNCTION_DECL
)
3044 error ("static chain in indirect gimple call");
3047 fn
= TREE_OPERAND (fn
, 0);
3049 if (!DECL_STATIC_CHAIN (fn
))
3051 error ("static chain with function that doesn't use one");
3056 /* ??? The C frontend passes unpromoted arguments in case it
3057 didn't see a function declaration before the call. So for now
3058 leave the call arguments mostly unverified. Once we gimplify
3059 unit-at-a-time we have a chance to fix this. */
3061 for (i
= 0; i
< gimple_call_num_args (stmt
); ++i
)
3063 tree arg
= gimple_call_arg (stmt
, i
);
3064 if (!is_gimple_operand (arg
))
3066 error ("invalid argument to gimple call");
3067 debug_generic_expr (arg
);
3074 /* Verifies the gimple comparison with the result type TYPE and
3075 the operands OP0 and OP1. */
3078 verify_gimple_comparison (tree type
, tree op0
, tree op1
)
3080 tree op0_type
= TREE_TYPE (op0
);
3081 tree op1_type
= TREE_TYPE (op1
);
3083 if (!is_gimple_val (op0
) || !is_gimple_val (op1
))
3085 error ("invalid operands in gimple comparison");
3089 /* For comparisons we do not have the operations type as the
3090 effective type the comparison is carried out in. Instead
3091 we require that either the first operand is trivially
3092 convertible into the second, or the other way around.
3093 The resulting type of a comparison may be any integral type.
3094 Because we special-case pointers to void we allow
3095 comparisons of pointers with the same mode as well. */
3096 if ((!useless_type_conversion_p (op0_type
, op1_type
)
3097 && !useless_type_conversion_p (op1_type
, op0_type
)
3098 && (!POINTER_TYPE_P (op0_type
)
3099 || !POINTER_TYPE_P (op1_type
)
3100 || TYPE_MODE (op0_type
) != TYPE_MODE (op1_type
)))
3101 || !INTEGRAL_TYPE_P (type
))
3103 error ("type mismatch in comparison expression");
3104 debug_generic_expr (type
);
3105 debug_generic_expr (op0_type
);
3106 debug_generic_expr (op1_type
);
3113 /* Verify a gimple assignment statement STMT with an unary rhs.
3114 Returns true if anything is wrong. */
3117 verify_gimple_assign_unary (gimple stmt
)
3119 enum tree_code rhs_code
= gimple_assign_rhs_code (stmt
);
3120 tree lhs
= gimple_assign_lhs (stmt
);
3121 tree lhs_type
= TREE_TYPE (lhs
);
3122 tree rhs1
= gimple_assign_rhs1 (stmt
);
3123 tree rhs1_type
= TREE_TYPE (rhs1
);
3125 if (!is_gimple_reg (lhs
)
3127 && TREE_CODE (lhs_type
) == COMPLEX_TYPE
))
3129 error ("non-register as LHS of unary operation");
3133 if (!is_gimple_val (rhs1
))
3135 error ("invalid operand in unary operation");
3139 /* First handle conversions. */
3144 /* Allow conversions between integral types and pointers only if
3145 there is no sign or zero extension involved.
3146 For targets were the precision of sizetype doesn't match that
3147 of pointers we need to allow arbitrary conversions from and
3149 if ((POINTER_TYPE_P (lhs_type
)
3150 && INTEGRAL_TYPE_P (rhs1_type
)
3151 && (TYPE_PRECISION (lhs_type
) >= TYPE_PRECISION (rhs1_type
)
3152 || rhs1_type
== sizetype
))
3153 || (POINTER_TYPE_P (rhs1_type
)
3154 && INTEGRAL_TYPE_P (lhs_type
)
3155 && (TYPE_PRECISION (rhs1_type
) >= TYPE_PRECISION (lhs_type
)
3156 || lhs_type
== sizetype
)))
3159 /* Allow conversion from integer to offset type and vice versa. */
3160 if ((TREE_CODE (lhs_type
) == OFFSET_TYPE
3161 && TREE_CODE (rhs1_type
) == INTEGER_TYPE
)
3162 || (TREE_CODE (lhs_type
) == INTEGER_TYPE
3163 && TREE_CODE (rhs1_type
) == OFFSET_TYPE
))
3166 /* Otherwise assert we are converting between types of the
3168 if (INTEGRAL_TYPE_P (lhs_type
) != INTEGRAL_TYPE_P (rhs1_type
))
3170 error ("invalid types in nop conversion");
3171 debug_generic_expr (lhs_type
);
3172 debug_generic_expr (rhs1_type
);
3179 case ADDR_SPACE_CONVERT_EXPR
:
3181 if (!POINTER_TYPE_P (rhs1_type
) || !POINTER_TYPE_P (lhs_type
)
3182 || (TYPE_ADDR_SPACE (TREE_TYPE (rhs1_type
))
3183 == TYPE_ADDR_SPACE (TREE_TYPE (lhs_type
))))
3185 error ("invalid types in address space conversion");
3186 debug_generic_expr (lhs_type
);
3187 debug_generic_expr (rhs1_type
);
3194 case FIXED_CONVERT_EXPR
:
3196 if (!valid_fixed_convert_types_p (lhs_type
, rhs1_type
)
3197 && !valid_fixed_convert_types_p (rhs1_type
, lhs_type
))
3199 error ("invalid types in fixed-point conversion");
3200 debug_generic_expr (lhs_type
);
3201 debug_generic_expr (rhs1_type
);
3210 if (!INTEGRAL_TYPE_P (rhs1_type
) || !SCALAR_FLOAT_TYPE_P (lhs_type
))
3212 error ("invalid types in conversion to floating point");
3213 debug_generic_expr (lhs_type
);
3214 debug_generic_expr (rhs1_type
);
3221 case FIX_TRUNC_EXPR
:
3223 if (!INTEGRAL_TYPE_P (lhs_type
) || !SCALAR_FLOAT_TYPE_P (rhs1_type
))
3225 error ("invalid types in conversion to integer");
3226 debug_generic_expr (lhs_type
);
3227 debug_generic_expr (rhs1_type
);
3234 case VEC_UNPACK_HI_EXPR
:
3235 case VEC_UNPACK_LO_EXPR
:
3236 case REDUC_MAX_EXPR
:
3237 case REDUC_MIN_EXPR
:
3238 case REDUC_PLUS_EXPR
:
3239 case VEC_UNPACK_FLOAT_HI_EXPR
:
3240 case VEC_UNPACK_FLOAT_LO_EXPR
:
3244 case TRUTH_NOT_EXPR
:
3249 case NON_LVALUE_EXPR
:
3257 /* For the remaining codes assert there is no conversion involved. */
3258 if (!useless_type_conversion_p (lhs_type
, rhs1_type
))
3260 error ("non-trivial conversion in unary operation");
3261 debug_generic_expr (lhs_type
);
3262 debug_generic_expr (rhs1_type
);
3269 /* Verify a gimple assignment statement STMT with a binary rhs.
3270 Returns true if anything is wrong. */
3273 verify_gimple_assign_binary (gimple stmt
)
3275 enum tree_code rhs_code
= gimple_assign_rhs_code (stmt
);
3276 tree lhs
= gimple_assign_lhs (stmt
);
3277 tree lhs_type
= TREE_TYPE (lhs
);
3278 tree rhs1
= gimple_assign_rhs1 (stmt
);
3279 tree rhs1_type
= TREE_TYPE (rhs1
);
3280 tree rhs2
= gimple_assign_rhs2 (stmt
);
3281 tree rhs2_type
= TREE_TYPE (rhs2
);
3283 if (!is_gimple_reg (lhs
)
3285 && TREE_CODE (lhs_type
) == COMPLEX_TYPE
))
3287 error ("non-register as LHS of binary operation");
3291 if (!is_gimple_val (rhs1
)
3292 || !is_gimple_val (rhs2
))
3294 error ("invalid operands in binary operation");
3298 /* First handle operations that involve different types. */
3303 if (TREE_CODE (lhs_type
) != COMPLEX_TYPE
3304 || !(INTEGRAL_TYPE_P (rhs1_type
)
3305 || SCALAR_FLOAT_TYPE_P (rhs1_type
))
3306 || !(INTEGRAL_TYPE_P (rhs2_type
)
3307 || SCALAR_FLOAT_TYPE_P (rhs2_type
)))
3309 error ("type mismatch in complex expression");
3310 debug_generic_expr (lhs_type
);
3311 debug_generic_expr (rhs1_type
);
3312 debug_generic_expr (rhs2_type
);
3324 /* Shifts and rotates are ok on integral types, fixed point
3325 types and integer vector types. */
3326 if ((!INTEGRAL_TYPE_P (rhs1_type
)
3327 && !FIXED_POINT_TYPE_P (rhs1_type
)
3328 && !(TREE_CODE (rhs1_type
) == VECTOR_TYPE
3329 && INTEGRAL_TYPE_P (TREE_TYPE (rhs1_type
))))
3330 || (!INTEGRAL_TYPE_P (rhs2_type
)
3331 /* Vector shifts of vectors are also ok. */
3332 && !(TREE_CODE (rhs1_type
) == VECTOR_TYPE
3333 && INTEGRAL_TYPE_P (TREE_TYPE (rhs1_type
))
3334 && TREE_CODE (rhs2_type
) == VECTOR_TYPE
3335 && INTEGRAL_TYPE_P (TREE_TYPE (rhs2_type
))))
3336 || !useless_type_conversion_p (lhs_type
, rhs1_type
))
3338 error ("type mismatch in shift expression");
3339 debug_generic_expr (lhs_type
);
3340 debug_generic_expr (rhs1_type
);
3341 debug_generic_expr (rhs2_type
);
3348 case VEC_LSHIFT_EXPR
:
3349 case VEC_RSHIFT_EXPR
:
3351 if (TREE_CODE (rhs1_type
) != VECTOR_TYPE
3352 || !(INTEGRAL_TYPE_P (TREE_TYPE (rhs1_type
))
3353 || FIXED_POINT_TYPE_P (TREE_TYPE (rhs1_type
))
3354 || SCALAR_FLOAT_TYPE_P (TREE_TYPE (rhs1_type
)))
3355 || (!INTEGRAL_TYPE_P (rhs2_type
)
3356 && (TREE_CODE (rhs2_type
) != VECTOR_TYPE
3357 || !INTEGRAL_TYPE_P (TREE_TYPE (rhs2_type
))))
3358 || !useless_type_conversion_p (lhs_type
, rhs1_type
))
3360 error ("type mismatch in vector shift expression");
3361 debug_generic_expr (lhs_type
);
3362 debug_generic_expr (rhs1_type
);
3363 debug_generic_expr (rhs2_type
);
3366 /* For shifting a vector of floating point components we
3367 only allow shifting by a constant multiple of the element size. */
3368 if (SCALAR_FLOAT_TYPE_P (TREE_TYPE (rhs1_type
))
3369 && (TREE_CODE (rhs2
) != INTEGER_CST
3370 || !div_if_zero_remainder (EXACT_DIV_EXPR
, rhs2
,
3371 TYPE_SIZE (TREE_TYPE (rhs1_type
)))))
3373 error ("non-element sized vector shift of floating point vector");
3382 /* We use regular PLUS_EXPR for vectors.
3383 ??? This just makes the checker happy and may not be what is
3385 if (TREE_CODE (lhs_type
) == VECTOR_TYPE
3386 && POINTER_TYPE_P (TREE_TYPE (lhs_type
)))
3388 if (TREE_CODE (rhs1_type
) != VECTOR_TYPE
3389 || TREE_CODE (rhs2_type
) != VECTOR_TYPE
)
3391 error ("invalid non-vector operands to vector valued plus");
3394 lhs_type
= TREE_TYPE (lhs_type
);
3395 rhs1_type
= TREE_TYPE (rhs1_type
);
3396 rhs2_type
= TREE_TYPE (rhs2_type
);
3397 /* PLUS_EXPR is commutative, so we might end up canonicalizing
3398 the pointer to 2nd place. */
3399 if (POINTER_TYPE_P (rhs2_type
))
3401 tree tem
= rhs1_type
;
3402 rhs1_type
= rhs2_type
;
3405 goto do_pointer_plus_expr_check
;
3411 if (POINTER_TYPE_P (lhs_type
)
3412 || POINTER_TYPE_P (rhs1_type
)
3413 || POINTER_TYPE_P (rhs2_type
))
3415 error ("invalid (pointer) operands to plus/minus");
3419 /* Continue with generic binary expression handling. */
3423 case POINTER_PLUS_EXPR
:
3425 do_pointer_plus_expr_check
:
3426 if (!POINTER_TYPE_P (rhs1_type
)
3427 || !useless_type_conversion_p (lhs_type
, rhs1_type
)
3428 || !useless_type_conversion_p (sizetype
, rhs2_type
))
3430 error ("type mismatch in pointer plus expression");
3431 debug_generic_stmt (lhs_type
);
3432 debug_generic_stmt (rhs1_type
);
3433 debug_generic_stmt (rhs2_type
);
3440 case TRUTH_ANDIF_EXPR
:
3441 case TRUTH_ORIF_EXPR
:
3444 case TRUTH_AND_EXPR
:
3446 case TRUTH_XOR_EXPR
:
3448 /* We allow any kind of integral typed argument and result. */
3449 if (!INTEGRAL_TYPE_P (rhs1_type
)
3450 || !INTEGRAL_TYPE_P (rhs2_type
)
3451 || !INTEGRAL_TYPE_P (lhs_type
))
3453 error ("type mismatch in binary truth expression");
3454 debug_generic_expr (lhs_type
);
3455 debug_generic_expr (rhs1_type
);
3456 debug_generic_expr (rhs2_type
);
3469 case UNORDERED_EXPR
:
3477 /* Comparisons are also binary, but the result type is not
3478 connected to the operand types. */
3479 return verify_gimple_comparison (lhs_type
, rhs1
, rhs2
);
3481 case WIDEN_MULT_EXPR
:
3482 if (TREE_CODE (lhs_type
) != INTEGER_TYPE
)
3484 return ((2 * TYPE_PRECISION (rhs1_type
) != TYPE_PRECISION (lhs_type
))
3485 || (TYPE_PRECISION (rhs1_type
) != TYPE_PRECISION (rhs2_type
)));
3487 case WIDEN_SUM_EXPR
:
3488 case VEC_WIDEN_MULT_HI_EXPR
:
3489 case VEC_WIDEN_MULT_LO_EXPR
:
3490 case VEC_PACK_TRUNC_EXPR
:
3491 case VEC_PACK_SAT_EXPR
:
3492 case VEC_PACK_FIX_TRUNC_EXPR
:
3493 case VEC_EXTRACT_EVEN_EXPR
:
3494 case VEC_EXTRACT_ODD_EXPR
:
3495 case VEC_INTERLEAVE_HIGH_EXPR
:
3496 case VEC_INTERLEAVE_LOW_EXPR
:
3501 case TRUNC_DIV_EXPR
:
3503 case FLOOR_DIV_EXPR
:
3504 case ROUND_DIV_EXPR
:
3505 case TRUNC_MOD_EXPR
:
3507 case FLOOR_MOD_EXPR
:
3508 case ROUND_MOD_EXPR
:
3510 case EXACT_DIV_EXPR
:
3516 /* Continue with generic binary expression handling. */
3523 if (!useless_type_conversion_p (lhs_type
, rhs1_type
)
3524 || !useless_type_conversion_p (lhs_type
, rhs2_type
))
3526 error ("type mismatch in binary expression");
3527 debug_generic_stmt (lhs_type
);
3528 debug_generic_stmt (rhs1_type
);
3529 debug_generic_stmt (rhs2_type
);
3536 /* Verify a gimple assignment statement STMT with a single rhs.
3537 Returns true if anything is wrong. */
3540 verify_gimple_assign_single (gimple stmt
)
3542 enum tree_code rhs_code
= gimple_assign_rhs_code (stmt
);
3543 tree lhs
= gimple_assign_lhs (stmt
);
3544 tree lhs_type
= TREE_TYPE (lhs
);
3545 tree rhs1
= gimple_assign_rhs1 (stmt
);
3546 tree rhs1_type
= TREE_TYPE (rhs1
);
3549 if (!useless_type_conversion_p (lhs_type
, rhs1_type
))
3551 error ("non-trivial conversion at assignment");
3552 debug_generic_expr (lhs_type
);
3553 debug_generic_expr (rhs1_type
);
3557 if (handled_component_p (lhs
))
3558 res
|= verify_types_in_gimple_reference (lhs
, true);
3560 /* Special codes we cannot handle via their class. */
3565 tree op
= TREE_OPERAND (rhs1
, 0);
3566 if (!is_gimple_addressable (op
))
3568 error ("invalid operand in unary expression");
3572 if (!types_compatible_p (TREE_TYPE (op
), TREE_TYPE (TREE_TYPE (rhs1
)))
3573 && !one_pointer_to_useless_type_conversion_p (TREE_TYPE (rhs1
),
3576 error ("type mismatch in address expression");
3577 debug_generic_stmt (TREE_TYPE (rhs1
));
3578 debug_generic_stmt (TREE_TYPE (op
));
3582 return verify_types_in_gimple_reference (op
, true);
3589 case ALIGN_INDIRECT_REF
:
3590 case MISALIGNED_INDIRECT_REF
:
3592 case ARRAY_RANGE_REF
:
3593 case VIEW_CONVERT_EXPR
:
3596 case TARGET_MEM_REF
:
3597 if (!is_gimple_reg (lhs
)
3598 && is_gimple_reg_type (TREE_TYPE (lhs
)))
3600 error ("invalid rhs for gimple memory store");
3601 debug_generic_stmt (lhs
);
3602 debug_generic_stmt (rhs1
);
3605 return res
|| verify_types_in_gimple_reference (rhs1
, false);
3617 /* tcc_declaration */
3622 if (!is_gimple_reg (lhs
)
3623 && !is_gimple_reg (rhs1
)
3624 && is_gimple_reg_type (TREE_TYPE (lhs
)))
3626 error ("invalid rhs for gimple memory store");
3627 debug_generic_stmt (lhs
);
3628 debug_generic_stmt (rhs1
);
3634 if (!is_gimple_reg (lhs
)
3635 || (!is_gimple_reg (TREE_OPERAND (rhs1
, 0))
3636 && !COMPARISON_CLASS_P (TREE_OPERAND (rhs1
, 0)))
3637 || (!is_gimple_reg (TREE_OPERAND (rhs1
, 1))
3638 && !is_gimple_min_invariant (TREE_OPERAND (rhs1
, 1)))
3639 || (!is_gimple_reg (TREE_OPERAND (rhs1
, 2))
3640 && !is_gimple_min_invariant (TREE_OPERAND (rhs1
, 2))))
3642 error ("invalid COND_EXPR in gimple assignment");
3643 debug_generic_stmt (rhs1
);
3651 case WITH_SIZE_EXPR
:
3652 case POLYNOMIAL_CHREC
:
3655 case REALIGN_LOAD_EXPR
:
3665 /* Verify the contents of a GIMPLE_ASSIGN STMT. Returns true when there
3666 is a problem, otherwise false. */
3669 verify_gimple_assign (gimple stmt
)
3671 switch (gimple_assign_rhs_class (stmt
))
3673 case GIMPLE_SINGLE_RHS
:
3674 return verify_gimple_assign_single (stmt
);
3676 case GIMPLE_UNARY_RHS
:
3677 return verify_gimple_assign_unary (stmt
);
3679 case GIMPLE_BINARY_RHS
:
3680 return verify_gimple_assign_binary (stmt
);
3687 /* Verify the contents of a GIMPLE_RETURN STMT. Returns true when there
3688 is a problem, otherwise false. */
3691 verify_gimple_return (gimple stmt
)
3693 tree op
= gimple_return_retval (stmt
);
3694 tree restype
= TREE_TYPE (TREE_TYPE (cfun
->decl
));
3696 /* We cannot test for present return values as we do not fix up missing
3697 return values from the original source. */
3701 if (!is_gimple_val (op
)
3702 && TREE_CODE (op
) != RESULT_DECL
)
3704 error ("invalid operand in return statement");
3705 debug_generic_stmt (op
);
3709 if (!useless_type_conversion_p (restype
, TREE_TYPE (op
))
3710 /* ??? With C++ we can have the situation that the result
3711 decl is a reference type while the return type is an aggregate. */
3712 && !(TREE_CODE (op
) == RESULT_DECL
3713 && TREE_CODE (TREE_TYPE (op
)) == REFERENCE_TYPE
3714 && useless_type_conversion_p (restype
, TREE_TYPE (TREE_TYPE (op
)))))
3716 error ("invalid conversion in return statement");
3717 debug_generic_stmt (restype
);
3718 debug_generic_stmt (TREE_TYPE (op
));
3726 /* Verify the contents of a GIMPLE_GOTO STMT. Returns true when there
3727 is a problem, otherwise false. */
3730 verify_gimple_goto (gimple stmt
)
3732 tree dest
= gimple_goto_dest (stmt
);
3734 /* ??? We have two canonical forms of direct goto destinations, a
3735 bare LABEL_DECL and an ADDR_EXPR of a LABEL_DECL. */
3736 if (TREE_CODE (dest
) != LABEL_DECL
3737 && (!is_gimple_val (dest
)
3738 || !POINTER_TYPE_P (TREE_TYPE (dest
))))
3740 error ("goto destination is neither a label nor a pointer");
3747 /* Verify the contents of a GIMPLE_SWITCH STMT. Returns true when there
3748 is a problem, otherwise false. */
3751 verify_gimple_switch (gimple stmt
)
3753 if (!is_gimple_val (gimple_switch_index (stmt
)))
3755 error ("invalid operand to switch statement");
3756 debug_generic_stmt (gimple_switch_index (stmt
));
3764 /* Verify the contents of a GIMPLE_PHI. Returns true if there is a problem,
3765 and false otherwise. */
3768 verify_gimple_phi (gimple stmt
)
3770 tree type
= TREE_TYPE (gimple_phi_result (stmt
));
3773 if (TREE_CODE (gimple_phi_result (stmt
)) != SSA_NAME
)
3775 error ("Invalid PHI result");
3779 for (i
= 0; i
< gimple_phi_num_args (stmt
); i
++)
3781 tree arg
= gimple_phi_arg_def (stmt
, i
);
3782 if ((is_gimple_reg (gimple_phi_result (stmt
))
3783 && !is_gimple_val (arg
))
3784 || (!is_gimple_reg (gimple_phi_result (stmt
))
3785 && !is_gimple_addressable (arg
)))
3787 error ("Invalid PHI argument");
3788 debug_generic_stmt (arg
);
3791 if (!useless_type_conversion_p (type
, TREE_TYPE (arg
)))
3793 error ("Incompatible types in PHI argument %u", i
);
3794 debug_generic_stmt (type
);
3795 debug_generic_stmt (TREE_TYPE (arg
));
3804 /* Verify a gimple debug statement STMT.
3805 Returns true if anything is wrong. */
3808 verify_gimple_debug (gimple stmt ATTRIBUTE_UNUSED
)
3810 /* There isn't much that could be wrong in a gimple debug stmt. A
3811 gimple debug bind stmt, for example, maps a tree, that's usually
3812 a VAR_DECL or a PARM_DECL, but that could also be some scalarized
3813 component or member of an aggregate type, to another tree, that
3814 can be an arbitrary expression. These stmts expand into debug
3815 insns, and are converted to debug notes by var-tracking.c. */
3820 /* Verify the GIMPLE statement STMT. Returns true if there is an
3821 error, otherwise false. */
3824 verify_types_in_gimple_stmt (gimple stmt
)
3826 switch (gimple_code (stmt
))
3829 return verify_gimple_assign (stmt
);
3832 return TREE_CODE (gimple_label_label (stmt
)) != LABEL_DECL
;
3835 return verify_gimple_call (stmt
);
3838 if (TREE_CODE_CLASS (gimple_cond_code (stmt
)) != tcc_comparison
)
3840 error ("invalid comparison code in gimple cond");
3843 if (!(!gimple_cond_true_label (stmt
)
3844 || TREE_CODE (gimple_cond_true_label (stmt
)) == LABEL_DECL
)
3845 || !(!gimple_cond_false_label (stmt
)
3846 || TREE_CODE (gimple_cond_false_label (stmt
)) == LABEL_DECL
))
3848 error ("invalid labels in gimple cond");
3852 return verify_gimple_comparison (boolean_type_node
,
3853 gimple_cond_lhs (stmt
),
3854 gimple_cond_rhs (stmt
));
3857 return verify_gimple_goto (stmt
);
3860 return verify_gimple_switch (stmt
);
3863 return verify_gimple_return (stmt
);
3869 return verify_gimple_phi (stmt
);
3871 /* Tuples that do not have tree operands. */
3873 case GIMPLE_PREDICT
:
3875 case GIMPLE_EH_DISPATCH
:
3876 case GIMPLE_EH_MUST_NOT_THROW
:
3880 /* OpenMP directives are validated by the FE and never operated
3881 on by the optimizers. Furthermore, GIMPLE_OMP_FOR may contain
3882 non-gimple expressions when the main index variable has had
3883 its address taken. This does not affect the loop itself
3884 because the header of an GIMPLE_OMP_FOR is merely used to determine
3885 how to setup the parallel iteration. */
3889 return verify_gimple_debug (stmt
);
3896 /* Verify the GIMPLE statements inside the sequence STMTS. */
3899 verify_types_in_gimple_seq_2 (gimple_seq stmts
)
3901 gimple_stmt_iterator ittr
;
3904 for (ittr
= gsi_start (stmts
); !gsi_end_p (ittr
); gsi_next (&ittr
))
3906 gimple stmt
= gsi_stmt (ittr
);
3908 switch (gimple_code (stmt
))
3911 err
|= verify_types_in_gimple_seq_2 (gimple_bind_body (stmt
));
3915 err
|= verify_types_in_gimple_seq_2 (gimple_try_eval (stmt
));
3916 err
|= verify_types_in_gimple_seq_2 (gimple_try_cleanup (stmt
));
3919 case GIMPLE_EH_FILTER
:
3920 err
|= verify_types_in_gimple_seq_2 (gimple_eh_filter_failure (stmt
));
3924 err
|= verify_types_in_gimple_seq_2 (gimple_catch_handler (stmt
));
3929 bool err2
= verify_types_in_gimple_stmt (stmt
);
3931 debug_gimple_stmt (stmt
);
3941 /* Verify the GIMPLE statements inside the statement list STMTS. */
3944 verify_types_in_gimple_seq (gimple_seq stmts
)
3946 if (verify_types_in_gimple_seq_2 (stmts
))
3947 internal_error ("verify_gimple failed");
3951 /* Verify STMT, return true if STMT is not in GIMPLE form.
3952 TODO: Implement type checking. */
3955 verify_stmt (gimple_stmt_iterator
*gsi
)
3958 struct walk_stmt_info wi
;
3959 bool last_in_block
= gsi_one_before_end_p (*gsi
);
3960 gimple stmt
= gsi_stmt (*gsi
);
3963 if (is_gimple_omp (stmt
))
3965 /* OpenMP directives are validated by the FE and never operated
3966 on by the optimizers. Furthermore, GIMPLE_OMP_FOR may contain
3967 non-gimple expressions when the main index variable has had
3968 its address taken. This does not affect the loop itself
3969 because the header of an GIMPLE_OMP_FOR is merely used to determine
3970 how to setup the parallel iteration. */
3974 /* FIXME. The C frontend passes unpromoted arguments in case it
3975 didn't see a function declaration before the call. */
3976 if (is_gimple_call (stmt
))
3980 if (!is_gimple_call_addr (gimple_call_fn (stmt
)))
3982 error ("invalid function in call statement");
3986 decl
= gimple_call_fndecl (stmt
);
3988 && TREE_CODE (decl
) == FUNCTION_DECL
3989 && DECL_LOOPING_CONST_OR_PURE_P (decl
)
3990 && (!DECL_PURE_P (decl
))
3991 && (!TREE_READONLY (decl
)))
3993 error ("invalid pure const state for function");
3998 if (is_gimple_debug (stmt
))
4001 memset (&wi
, 0, sizeof (wi
));
4002 addr
= walk_gimple_op (gsi_stmt (*gsi
), verify_expr
, &wi
);
4005 debug_generic_expr (addr
);
4006 inform (gimple_location (gsi_stmt (*gsi
)), "in statement");
4007 debug_gimple_stmt (stmt
);
4011 /* If the statement is marked as part of an EH region, then it is
4012 expected that the statement could throw. Verify that when we
4013 have optimizations that simplify statements such that we prove
4014 that they cannot throw, that we update other data structures
4016 lp_nr
= lookup_stmt_eh_lp (stmt
);
4019 if (!stmt_could_throw_p (stmt
))
4021 error ("statement marked for throw, but doesn%'t");
4024 else if (lp_nr
> 0 && !last_in_block
&& stmt_can_throw_internal (stmt
))
4026 error ("statement marked for throw in middle of block");
4034 debug_gimple_stmt (stmt
);
4039 /* Return true when the T can be shared. */
4042 tree_node_can_be_shared (tree t
)
4044 if (IS_TYPE_OR_DECL_P (t
)
4045 || is_gimple_min_invariant (t
)
4046 || TREE_CODE (t
) == SSA_NAME
4047 || t
== error_mark_node
4048 || TREE_CODE (t
) == IDENTIFIER_NODE
)
4051 if (TREE_CODE (t
) == CASE_LABEL_EXPR
)
4054 while (((TREE_CODE (t
) == ARRAY_REF
|| TREE_CODE (t
) == ARRAY_RANGE_REF
)
4055 && is_gimple_min_invariant (TREE_OPERAND (t
, 1)))
4056 || TREE_CODE (t
) == COMPONENT_REF
4057 || TREE_CODE (t
) == REALPART_EXPR
4058 || TREE_CODE (t
) == IMAGPART_EXPR
)
4059 t
= TREE_OPERAND (t
, 0);
4068 /* Called via walk_gimple_stmt. Verify tree sharing. */
4071 verify_node_sharing (tree
*tp
, int *walk_subtrees
, void *data
)
4073 struct walk_stmt_info
*wi
= (struct walk_stmt_info
*) data
;
4074 struct pointer_set_t
*visited
= (struct pointer_set_t
*) wi
->info
;
4076 if (tree_node_can_be_shared (*tp
))
4078 *walk_subtrees
= false;
4082 if (pointer_set_insert (visited
, *tp
))
4089 static bool eh_error_found
;
4091 verify_eh_throw_stmt_node (void **slot
, void *data
)
4093 struct throw_stmt_node
*node
= (struct throw_stmt_node
*)*slot
;
4094 struct pointer_set_t
*visited
= (struct pointer_set_t
*) data
;
4096 if (!pointer_set_contains (visited
, node
->stmt
))
4098 error ("Dead STMT in EH table");
4099 debug_gimple_stmt (node
->stmt
);
4100 eh_error_found
= true;
4106 /* Verify the GIMPLE statements in every basic block. */
4112 gimple_stmt_iterator gsi
;
4114 struct pointer_set_t
*visited
, *visited_stmts
;
4116 struct walk_stmt_info wi
;
4118 timevar_push (TV_TREE_STMT_VERIFY
);
4119 visited
= pointer_set_create ();
4120 visited_stmts
= pointer_set_create ();
4122 memset (&wi
, 0, sizeof (wi
));
4123 wi
.info
= (void *) visited
;
4130 for (gsi
= gsi_start_phis (bb
); !gsi_end_p (gsi
); gsi_next (&gsi
))
4132 phi
= gsi_stmt (gsi
);
4133 pointer_set_insert (visited_stmts
, phi
);
4134 if (gimple_bb (phi
) != bb
)
4136 error ("gimple_bb (phi) is set to a wrong basic block");
4140 for (i
= 0; i
< gimple_phi_num_args (phi
); i
++)
4142 tree t
= gimple_phi_arg_def (phi
, i
);
4147 error ("missing PHI def");
4148 debug_gimple_stmt (phi
);
4152 /* Addressable variables do have SSA_NAMEs but they
4153 are not considered gimple values. */
4154 else if (TREE_CODE (t
) != SSA_NAME
4155 && TREE_CODE (t
) != FUNCTION_DECL
4156 && !is_gimple_min_invariant (t
))
4158 error ("PHI argument is not a GIMPLE value");
4159 debug_gimple_stmt (phi
);
4160 debug_generic_expr (t
);
4164 addr
= walk_tree (&t
, verify_node_sharing
, visited
, NULL
);
4167 error ("incorrect sharing of tree nodes");
4168 debug_gimple_stmt (phi
);
4169 debug_generic_expr (addr
);
4174 #ifdef ENABLE_TYPES_CHECKING
4175 if (verify_gimple_phi (phi
))
4177 debug_gimple_stmt (phi
);
4183 for (gsi
= gsi_start_bb (bb
); !gsi_end_p (gsi
); )
4185 gimple stmt
= gsi_stmt (gsi
);
4187 if (gimple_code (stmt
) == GIMPLE_WITH_CLEANUP_EXPR
4188 || gimple_code (stmt
) == GIMPLE_BIND
)
4190 error ("invalid GIMPLE statement");
4191 debug_gimple_stmt (stmt
);
4195 pointer_set_insert (visited_stmts
, stmt
);
4197 if (gimple_bb (stmt
) != bb
)
4199 error ("gimple_bb (stmt) is set to a wrong basic block");
4200 debug_gimple_stmt (stmt
);
4204 if (gimple_code (stmt
) == GIMPLE_LABEL
)
4206 tree decl
= gimple_label_label (stmt
);
4207 int uid
= LABEL_DECL_UID (decl
);
4210 || VEC_index (basic_block
, label_to_block_map
, uid
) != bb
)
4212 error ("incorrect entry in label_to_block_map");
4216 uid
= EH_LANDING_PAD_NR (decl
);
4219 eh_landing_pad lp
= get_eh_landing_pad_from_number (uid
);
4220 if (decl
!= lp
->post_landing_pad
)
4222 error ("incorrect setting of landing pad number");
4228 err
|= verify_stmt (&gsi
);
4230 #ifdef ENABLE_TYPES_CHECKING
4231 if (verify_types_in_gimple_stmt (gsi_stmt (gsi
)))
4233 debug_gimple_stmt (stmt
);
4237 addr
= walk_gimple_op (gsi_stmt (gsi
), verify_node_sharing
, &wi
);
4240 error ("incorrect sharing of tree nodes");
4241 debug_gimple_stmt (stmt
);
4242 debug_generic_expr (addr
);
4249 eh_error_found
= false;
4250 if (get_eh_throw_stmt_table (cfun
))
4251 htab_traverse (get_eh_throw_stmt_table (cfun
),
4252 verify_eh_throw_stmt_node
,
4255 if (err
| eh_error_found
)
4256 internal_error ("verify_stmts failed");
4258 pointer_set_destroy (visited
);
4259 pointer_set_destroy (visited_stmts
);
4260 verify_histograms ();
4261 timevar_pop (TV_TREE_STMT_VERIFY
);
4265 /* Verifies that the flow information is OK. */
4268 gimple_verify_flow_info (void)
4272 gimple_stmt_iterator gsi
;
4277 if (ENTRY_BLOCK_PTR
->il
.gimple
)
4279 error ("ENTRY_BLOCK has IL associated with it");
4283 if (EXIT_BLOCK_PTR
->il
.gimple
)
4285 error ("EXIT_BLOCK has IL associated with it");
4289 FOR_EACH_EDGE (e
, ei
, EXIT_BLOCK_PTR
->preds
)
4290 if (e
->flags
& EDGE_FALLTHRU
)
4292 error ("fallthru to exit from bb %d", e
->src
->index
);
4298 bool found_ctrl_stmt
= false;
4302 /* Skip labels on the start of basic block. */
4303 for (gsi
= gsi_start_bb (bb
); !gsi_end_p (gsi
); gsi_next (&gsi
))
4306 gimple prev_stmt
= stmt
;
4308 stmt
= gsi_stmt (gsi
);
4310 if (gimple_code (stmt
) != GIMPLE_LABEL
)
4313 label
= gimple_label_label (stmt
);
4314 if (prev_stmt
&& DECL_NONLOCAL (label
))
4316 error ("nonlocal label ");
4317 print_generic_expr (stderr
, label
, 0);
4318 fprintf (stderr
, " is not first in a sequence of labels in bb %d",
4323 if (prev_stmt
&& EH_LANDING_PAD_NR (label
) != 0)
4325 error ("EH landing pad label ");
4326 print_generic_expr (stderr
, label
, 0);
4327 fprintf (stderr
, " is not first in a sequence of labels in bb %d",
4332 if (label_to_block (label
) != bb
)
4335 print_generic_expr (stderr
, label
, 0);
4336 fprintf (stderr
, " to block does not match in bb %d",
4341 if (decl_function_context (label
) != current_function_decl
)
4344 print_generic_expr (stderr
, label
, 0);
4345 fprintf (stderr
, " has incorrect context in bb %d",
4351 /* Verify that body of basic block BB is free of control flow. */
4352 for (; !gsi_end_p (gsi
); gsi_next (&gsi
))
4354 gimple stmt
= gsi_stmt (gsi
);
4356 if (found_ctrl_stmt
)
4358 error ("control flow in the middle of basic block %d",
4363 if (stmt_ends_bb_p (stmt
))
4364 found_ctrl_stmt
= true;
4366 if (gimple_code (stmt
) == GIMPLE_LABEL
)
4369 print_generic_expr (stderr
, gimple_label_label (stmt
), 0);
4370 fprintf (stderr
, " in the middle of basic block %d", bb
->index
);
4375 gsi
= gsi_last_bb (bb
);
4376 if (gsi_end_p (gsi
))
4379 stmt
= gsi_stmt (gsi
);
4381 if (gimple_code (stmt
) == GIMPLE_LABEL
)
4384 err
|= verify_eh_edges (stmt
);
4386 if (is_ctrl_stmt (stmt
))
4388 FOR_EACH_EDGE (e
, ei
, bb
->succs
)
4389 if (e
->flags
& EDGE_FALLTHRU
)
4391 error ("fallthru edge after a control statement in bb %d",
4397 if (gimple_code (stmt
) != GIMPLE_COND
)
4399 /* Verify that there are no edges with EDGE_TRUE/FALSE_FLAG set
4400 after anything else but if statement. */
4401 FOR_EACH_EDGE (e
, ei
, bb
->succs
)
4402 if (e
->flags
& (EDGE_TRUE_VALUE
| EDGE_FALSE_VALUE
))
4404 error ("true/false edge after a non-GIMPLE_COND in bb %d",
4410 switch (gimple_code (stmt
))
4417 extract_true_false_edges_from_block (bb
, &true_edge
, &false_edge
);
4421 || !(true_edge
->flags
& EDGE_TRUE_VALUE
)
4422 || !(false_edge
->flags
& EDGE_FALSE_VALUE
)
4423 || (true_edge
->flags
& (EDGE_FALLTHRU
| EDGE_ABNORMAL
))
4424 || (false_edge
->flags
& (EDGE_FALLTHRU
| EDGE_ABNORMAL
))
4425 || EDGE_COUNT (bb
->succs
) >= 3)
4427 error ("wrong outgoing edge flags at end of bb %d",
4435 if (simple_goto_p (stmt
))
4437 error ("explicit goto at end of bb %d", bb
->index
);
4442 /* FIXME. We should double check that the labels in the
4443 destination blocks have their address taken. */
4444 FOR_EACH_EDGE (e
, ei
, bb
->succs
)
4445 if ((e
->flags
& (EDGE_FALLTHRU
| EDGE_TRUE_VALUE
4446 | EDGE_FALSE_VALUE
))
4447 || !(e
->flags
& EDGE_ABNORMAL
))
4449 error ("wrong outgoing edge flags at end of bb %d",
4457 if (!gimple_call_builtin_p (stmt
, BUILT_IN_RETURN
))
4459 /* ... fallthru ... */
4461 if (!single_succ_p (bb
)
4462 || (single_succ_edge (bb
)->flags
4463 & (EDGE_FALLTHRU
| EDGE_ABNORMAL
4464 | EDGE_TRUE_VALUE
| EDGE_FALSE_VALUE
)))
4466 error ("wrong outgoing edge flags at end of bb %d", bb
->index
);
4469 if (single_succ (bb
) != EXIT_BLOCK_PTR
)
4471 error ("return edge does not point to exit in bb %d",
4483 n
= gimple_switch_num_labels (stmt
);
4485 /* Mark all the destination basic blocks. */
4486 for (i
= 0; i
< n
; ++i
)
4488 tree lab
= CASE_LABEL (gimple_switch_label (stmt
, i
));
4489 basic_block label_bb
= label_to_block (lab
);
4490 gcc_assert (!label_bb
->aux
|| label_bb
->aux
== (void *)1);
4491 label_bb
->aux
= (void *)1;
4494 /* Verify that the case labels are sorted. */
4495 prev
= gimple_switch_label (stmt
, 0);
4496 for (i
= 1; i
< n
; ++i
)
4498 tree c
= gimple_switch_label (stmt
, i
);
4501 error ("found default case not at the start of "
4507 && !tree_int_cst_lt (CASE_LOW (prev
), CASE_LOW (c
)))
4509 error ("case labels not sorted: ");
4510 print_generic_expr (stderr
, prev
, 0);
4511 fprintf (stderr
," is greater than ");
4512 print_generic_expr (stderr
, c
, 0);
4513 fprintf (stderr
," but comes before it.\n");
4518 /* VRP will remove the default case if it can prove it will
4519 never be executed. So do not verify there always exists
4520 a default case here. */
4522 FOR_EACH_EDGE (e
, ei
, bb
->succs
)
4526 error ("extra outgoing edge %d->%d",
4527 bb
->index
, e
->dest
->index
);
4531 e
->dest
->aux
= (void *)2;
4532 if ((e
->flags
& (EDGE_FALLTHRU
| EDGE_ABNORMAL
4533 | EDGE_TRUE_VALUE
| EDGE_FALSE_VALUE
)))
4535 error ("wrong outgoing edge flags at end of bb %d",
4541 /* Check that we have all of them. */
4542 for (i
= 0; i
< n
; ++i
)
4544 tree lab
= CASE_LABEL (gimple_switch_label (stmt
, i
));
4545 basic_block label_bb
= label_to_block (lab
);
4547 if (label_bb
->aux
!= (void *)2)
4549 error ("missing edge %i->%i", bb
->index
, label_bb
->index
);
4554 FOR_EACH_EDGE (e
, ei
, bb
->succs
)
4555 e
->dest
->aux
= (void *)0;
4559 case GIMPLE_EH_DISPATCH
:
4560 err
|= verify_eh_dispatch_edge (stmt
);
4568 if (dom_info_state (CDI_DOMINATORS
) >= DOM_NO_FAST_QUERY
)
4569 verify_dominators (CDI_DOMINATORS
);
4575 /* Updates phi nodes after creating a forwarder block joined
4576 by edge FALLTHRU. */
4579 gimple_make_forwarder_block (edge fallthru
)
4583 basic_block dummy
, bb
;
4585 gimple_stmt_iterator gsi
;
4587 dummy
= fallthru
->src
;
4588 bb
= fallthru
->dest
;
4590 if (single_pred_p (bb
))
4593 /* If we redirected a branch we must create new PHI nodes at the
4595 for (gsi
= gsi_start_phis (dummy
); !gsi_end_p (gsi
); gsi_next (&gsi
))
4597 gimple phi
, new_phi
;
4599 phi
= gsi_stmt (gsi
);
4600 var
= gimple_phi_result (phi
);
4601 new_phi
= create_phi_node (var
, bb
);
4602 SSA_NAME_DEF_STMT (var
) = new_phi
;
4603 gimple_phi_set_result (phi
, make_ssa_name (SSA_NAME_VAR (var
), phi
));
4604 add_phi_arg (new_phi
, gimple_phi_result (phi
), fallthru
,
4608 /* Add the arguments we have stored on edges. */
4609 FOR_EACH_EDGE (e
, ei
, bb
->preds
)
4614 flush_pending_stmts (e
);
4619 /* Return a non-special label in the head of basic block BLOCK.
4620 Create one if it doesn't exist. */
4623 gimple_block_label (basic_block bb
)
4625 gimple_stmt_iterator i
, s
= gsi_start_bb (bb
);
4630 for (i
= s
; !gsi_end_p (i
); first
= false, gsi_next (&i
))
4632 stmt
= gsi_stmt (i
);
4633 if (gimple_code (stmt
) != GIMPLE_LABEL
)
4635 label
= gimple_label_label (stmt
);
4636 if (!DECL_NONLOCAL (label
))
4639 gsi_move_before (&i
, &s
);
4644 label
= create_artificial_label (UNKNOWN_LOCATION
);
4645 stmt
= gimple_build_label (label
);
4646 gsi_insert_before (&s
, stmt
, GSI_NEW_STMT
);
4651 /* Attempt to perform edge redirection by replacing a possibly complex
4652 jump instruction by a goto or by removing the jump completely.
4653 This can apply only if all edges now point to the same block. The
4654 parameters and return values are equivalent to
4655 redirect_edge_and_branch. */
4658 gimple_try_redirect_by_replacing_jump (edge e
, basic_block target
)
4660 basic_block src
= e
->src
;
4661 gimple_stmt_iterator i
;
4664 /* We can replace or remove a complex jump only when we have exactly
4666 if (EDGE_COUNT (src
->succs
) != 2
4667 /* Verify that all targets will be TARGET. Specifically, the
4668 edge that is not E must also go to TARGET. */
4669 || EDGE_SUCC (src
, EDGE_SUCC (src
, 0) == e
)->dest
!= target
)
4672 i
= gsi_last_bb (src
);
4676 stmt
= gsi_stmt (i
);
4678 if (gimple_code (stmt
) == GIMPLE_COND
|| gimple_code (stmt
) == GIMPLE_SWITCH
)
4680 gsi_remove (&i
, true);
4681 e
= ssa_redirect_edge (e
, target
);
4682 e
->flags
= EDGE_FALLTHRU
;
4690 /* Redirect E to DEST. Return NULL on failure. Otherwise, return the
4691 edge representing the redirected branch. */
4694 gimple_redirect_edge_and_branch (edge e
, basic_block dest
)
4696 basic_block bb
= e
->src
;
4697 gimple_stmt_iterator gsi
;
4701 if (e
->flags
& EDGE_ABNORMAL
)
4704 if (e
->dest
== dest
)
4707 if (e
->flags
& EDGE_EH
)
4708 return redirect_eh_edge (e
, dest
);
4710 if (e
->src
!= ENTRY_BLOCK_PTR
)
4712 ret
= gimple_try_redirect_by_replacing_jump (e
, dest
);
4717 gsi
= gsi_last_bb (bb
);
4718 stmt
= gsi_end_p (gsi
) ? NULL
: gsi_stmt (gsi
);
4720 switch (stmt
? gimple_code (stmt
) : GIMPLE_ERROR_MARK
)
4723 /* For COND_EXPR, we only need to redirect the edge. */
4727 /* No non-abnormal edges should lead from a non-simple goto, and
4728 simple ones should be represented implicitly. */
4733 tree label
= gimple_block_label (dest
);
4734 tree cases
= get_cases_for_edge (e
, stmt
);
4736 /* If we have a list of cases associated with E, then use it
4737 as it's a lot faster than walking the entire case vector. */
4740 edge e2
= find_edge (e
->src
, dest
);
4747 CASE_LABEL (cases
) = label
;
4748 cases
= TREE_CHAIN (cases
);
4751 /* If there was already an edge in the CFG, then we need
4752 to move all the cases associated with E to E2. */
4755 tree cases2
= get_cases_for_edge (e2
, stmt
);
4757 TREE_CHAIN (last
) = TREE_CHAIN (cases2
);
4758 TREE_CHAIN (cases2
) = first
;
4760 bitmap_set_bit (touched_switch_bbs
, gimple_bb (stmt
)->index
);
4764 size_t i
, n
= gimple_switch_num_labels (stmt
);
4766 for (i
= 0; i
< n
; i
++)
4768 tree elt
= gimple_switch_label (stmt
, i
);
4769 if (label_to_block (CASE_LABEL (elt
)) == e
->dest
)
4770 CASE_LABEL (elt
) = label
;
4778 int i
, n
= gimple_asm_nlabels (stmt
);
4781 for (i
= 0; i
< n
; ++i
)
4783 tree cons
= gimple_asm_label_op (stmt
, i
);
4784 if (label_to_block (TREE_VALUE (cons
)) == e
->dest
)
4787 label
= gimple_block_label (dest
);
4788 TREE_VALUE (cons
) = label
;
4792 /* If we didn't find any label matching the former edge in the
4793 asm labels, we must be redirecting the fallthrough
4795 gcc_assert (label
|| (e
->flags
& EDGE_FALLTHRU
));
4800 gsi_remove (&gsi
, true);
4801 e
->flags
|= EDGE_FALLTHRU
;
4804 case GIMPLE_OMP_RETURN
:
4805 case GIMPLE_OMP_CONTINUE
:
4806 case GIMPLE_OMP_SECTIONS_SWITCH
:
4807 case GIMPLE_OMP_FOR
:
4808 /* The edges from OMP constructs can be simply redirected. */
4811 case GIMPLE_EH_DISPATCH
:
4812 if (!(e
->flags
& EDGE_FALLTHRU
))
4813 redirect_eh_dispatch_edge (stmt
, e
, dest
);
4817 /* Otherwise it must be a fallthru edge, and we don't need to
4818 do anything besides redirecting it. */
4819 gcc_assert (e
->flags
& EDGE_FALLTHRU
);
4823 /* Update/insert PHI nodes as necessary. */
4825 /* Now update the edges in the CFG. */
4826 e
= ssa_redirect_edge (e
, dest
);
4831 /* Returns true if it is possible to remove edge E by redirecting
4832 it to the destination of the other edge from E->src. */
4835 gimple_can_remove_branch_p (const_edge e
)
4837 if (e
->flags
& (EDGE_ABNORMAL
| EDGE_EH
))
4843 /* Simple wrapper, as we can always redirect fallthru edges. */
4846 gimple_redirect_edge_and_branch_force (edge e
, basic_block dest
)
4848 e
= gimple_redirect_edge_and_branch (e
, dest
);
4855 /* Splits basic block BB after statement STMT (but at least after the
4856 labels). If STMT is NULL, BB is split just after the labels. */
4859 gimple_split_block (basic_block bb
, void *stmt
)
4861 gimple_stmt_iterator gsi
;
4862 gimple_stmt_iterator gsi_tgt
;
4869 new_bb
= create_empty_bb (bb
);
4871 /* Redirect the outgoing edges. */
4872 new_bb
->succs
= bb
->succs
;
4874 FOR_EACH_EDGE (e
, ei
, new_bb
->succs
)
4877 if (stmt
&& gimple_code ((gimple
) stmt
) == GIMPLE_LABEL
)
4880 /* Move everything from GSI to the new basic block. */
4881 for (gsi
= gsi_start_bb (bb
); !gsi_end_p (gsi
); gsi_next (&gsi
))
4883 act
= gsi_stmt (gsi
);
4884 if (gimple_code (act
) == GIMPLE_LABEL
)
4897 if (gsi_end_p (gsi
))
4900 /* Split the statement list - avoid re-creating new containers as this
4901 brings ugly quadratic memory consumption in the inliner.
4902 (We are still quadratic since we need to update stmt BB pointers,
4904 list
= gsi_split_seq_before (&gsi
);
4905 set_bb_seq (new_bb
, list
);
4906 for (gsi_tgt
= gsi_start (list
);
4907 !gsi_end_p (gsi_tgt
); gsi_next (&gsi_tgt
))
4908 gimple_set_bb (gsi_stmt (gsi_tgt
), new_bb
);
4914 /* Moves basic block BB after block AFTER. */
4917 gimple_move_block_after (basic_block bb
, basic_block after
)
4919 if (bb
->prev_bb
== after
)
4923 link_block (bb
, after
);
4929 /* Return true if basic_block can be duplicated. */
4932 gimple_can_duplicate_bb_p (const_basic_block bb ATTRIBUTE_UNUSED
)
4937 /* Create a duplicate of the basic block BB. NOTE: This does not
4938 preserve SSA form. */
4941 gimple_duplicate_bb (basic_block bb
)
4944 gimple_stmt_iterator gsi
, gsi_tgt
;
4945 gimple_seq phis
= phi_nodes (bb
);
4946 gimple phi
, stmt
, copy
;
4948 new_bb
= create_empty_bb (EXIT_BLOCK_PTR
->prev_bb
);
4950 /* Copy the PHI nodes. We ignore PHI node arguments here because
4951 the incoming edges have not been setup yet. */
4952 for (gsi
= gsi_start (phis
); !gsi_end_p (gsi
); gsi_next (&gsi
))
4954 phi
= gsi_stmt (gsi
);
4955 copy
= create_phi_node (gimple_phi_result (phi
), new_bb
);
4956 create_new_def_for (gimple_phi_result (copy
), copy
,
4957 gimple_phi_result_ptr (copy
));
4960 gsi_tgt
= gsi_start_bb (new_bb
);
4961 for (gsi
= gsi_start_bb (bb
); !gsi_end_p (gsi
); gsi_next (&gsi
))
4963 def_operand_p def_p
;
4964 ssa_op_iter op_iter
;
4966 stmt
= gsi_stmt (gsi
);
4967 if (gimple_code (stmt
) == GIMPLE_LABEL
)
4970 /* Create a new copy of STMT and duplicate STMT's virtual
4972 copy
= gimple_copy (stmt
);
4973 gsi_insert_after (&gsi_tgt
, copy
, GSI_NEW_STMT
);
4975 maybe_duplicate_eh_stmt (copy
, stmt
);
4976 gimple_duplicate_stmt_histograms (cfun
, copy
, cfun
, stmt
);
4978 /* Create new names for all the definitions created by COPY and
4979 add replacement mappings for each new name. */
4980 FOR_EACH_SSA_DEF_OPERAND (def_p
, copy
, op_iter
, SSA_OP_ALL_DEFS
)
4981 create_new_def_for (DEF_FROM_PTR (def_p
), copy
, def_p
);
4987 /* Adds phi node arguments for edge E_COPY after basic block duplication. */
4990 add_phi_args_after_copy_edge (edge e_copy
)
4992 basic_block bb
, bb_copy
= e_copy
->src
, dest
;
4995 gimple phi
, phi_copy
;
4997 gimple_stmt_iterator psi
, psi_copy
;
4999 if (gimple_seq_empty_p (phi_nodes (e_copy
->dest
)))
5002 bb
= bb_copy
->flags
& BB_DUPLICATED
? get_bb_original (bb_copy
) : bb_copy
;
5004 if (e_copy
->dest
->flags
& BB_DUPLICATED
)
5005 dest
= get_bb_original (e_copy
->dest
);
5007 dest
= e_copy
->dest
;
5009 e
= find_edge (bb
, dest
);
5012 /* During loop unrolling the target of the latch edge is copied.
5013 In this case we are not looking for edge to dest, but to
5014 duplicated block whose original was dest. */
5015 FOR_EACH_EDGE (e
, ei
, bb
->succs
)
5017 if ((e
->dest
->flags
& BB_DUPLICATED
)
5018 && get_bb_original (e
->dest
) == dest
)
5022 gcc_assert (e
!= NULL
);
5025 for (psi
= gsi_start_phis (e
->dest
),
5026 psi_copy
= gsi_start_phis (e_copy
->dest
);
5028 gsi_next (&psi
), gsi_next (&psi_copy
))
5030 phi
= gsi_stmt (psi
);
5031 phi_copy
= gsi_stmt (psi_copy
);
5032 def
= PHI_ARG_DEF_FROM_EDGE (phi
, e
);
5033 add_phi_arg (phi_copy
, def
, e_copy
,
5034 gimple_phi_arg_location_from_edge (phi
, e
));
5039 /* Basic block BB_COPY was created by code duplication. Add phi node
5040 arguments for edges going out of BB_COPY. The blocks that were
5041 duplicated have BB_DUPLICATED set. */
5044 add_phi_args_after_copy_bb (basic_block bb_copy
)
5049 FOR_EACH_EDGE (e_copy
, ei
, bb_copy
->succs
)
5051 add_phi_args_after_copy_edge (e_copy
);
5055 /* Blocks in REGION_COPY array of length N_REGION were created by
5056 duplication of basic blocks. Add phi node arguments for edges
5057 going from these blocks. If E_COPY is not NULL, also add
5058 phi node arguments for its destination.*/
5061 add_phi_args_after_copy (basic_block
*region_copy
, unsigned n_region
,
5066 for (i
= 0; i
< n_region
; i
++)
5067 region_copy
[i
]->flags
|= BB_DUPLICATED
;
5069 for (i
= 0; i
< n_region
; i
++)
5070 add_phi_args_after_copy_bb (region_copy
[i
]);
5072 add_phi_args_after_copy_edge (e_copy
);
5074 for (i
= 0; i
< n_region
; i
++)
5075 region_copy
[i
]->flags
&= ~BB_DUPLICATED
;
5078 /* Duplicates a REGION (set of N_REGION basic blocks) with just a single
5079 important exit edge EXIT. By important we mean that no SSA name defined
5080 inside region is live over the other exit edges of the region. All entry
5081 edges to the region must go to ENTRY->dest. The edge ENTRY is redirected
5082 to the duplicate of the region. SSA form, dominance and loop information
5083 is updated. The new basic blocks are stored to REGION_COPY in the same
5084 order as they had in REGION, provided that REGION_COPY is not NULL.
5085 The function returns false if it is unable to copy the region,
5089 gimple_duplicate_sese_region (edge entry
, edge exit
,
5090 basic_block
*region
, unsigned n_region
,
5091 basic_block
*region_copy
)
5094 bool free_region_copy
= false, copying_header
= false;
5095 struct loop
*loop
= entry
->dest
->loop_father
;
5097 VEC (basic_block
, heap
) *doms
;
5099 int total_freq
= 0, entry_freq
= 0;
5100 gcov_type total_count
= 0, entry_count
= 0;
5102 if (!can_copy_bbs_p (region
, n_region
))
5105 /* Some sanity checking. Note that we do not check for all possible
5106 missuses of the functions. I.e. if you ask to copy something weird,
5107 it will work, but the state of structures probably will not be
5109 for (i
= 0; i
< n_region
; i
++)
5111 /* We do not handle subloops, i.e. all the blocks must belong to the
5113 if (region
[i
]->loop_father
!= loop
)
5116 if (region
[i
] != entry
->dest
5117 && region
[i
] == loop
->header
)
5121 set_loop_copy (loop
, loop
);
5123 /* In case the function is used for loop header copying (which is the primary
5124 use), ensure that EXIT and its copy will be new latch and entry edges. */
5125 if (loop
->header
== entry
->dest
)
5127 copying_header
= true;
5128 set_loop_copy (loop
, loop_outer (loop
));
5130 if (!dominated_by_p (CDI_DOMINATORS
, loop
->latch
, exit
->src
))
5133 for (i
= 0; i
< n_region
; i
++)
5134 if (region
[i
] != exit
->src
5135 && dominated_by_p (CDI_DOMINATORS
, region
[i
], exit
->src
))
5141 region_copy
= XNEWVEC (basic_block
, n_region
);
5142 free_region_copy
= true;
5145 gcc_assert (!need_ssa_update_p (cfun
));
5147 /* Record blocks outside the region that are dominated by something
5150 initialize_original_copy_tables ();
5152 doms
= get_dominated_by_region (CDI_DOMINATORS
, region
, n_region
);
5154 if (entry
->dest
->count
)
5156 total_count
= entry
->dest
->count
;
5157 entry_count
= entry
->count
;
5158 /* Fix up corner cases, to avoid division by zero or creation of negative
5160 if (entry_count
> total_count
)
5161 entry_count
= total_count
;
5165 total_freq
= entry
->dest
->frequency
;
5166 entry_freq
= EDGE_FREQUENCY (entry
);
5167 /* Fix up corner cases, to avoid division by zero or creation of negative
5169 if (total_freq
== 0)
5171 else if (entry_freq
> total_freq
)
5172 entry_freq
= total_freq
;
5175 copy_bbs (region
, n_region
, region_copy
, &exit
, 1, &exit_copy
, loop
,
5176 split_edge_bb_loc (entry
));
5179 scale_bbs_frequencies_gcov_type (region
, n_region
,
5180 total_count
- entry_count
,
5182 scale_bbs_frequencies_gcov_type (region_copy
, n_region
, entry_count
,
5187 scale_bbs_frequencies_int (region
, n_region
, total_freq
- entry_freq
,
5189 scale_bbs_frequencies_int (region_copy
, n_region
, entry_freq
, total_freq
);
5194 loop
->header
= exit
->dest
;
5195 loop
->latch
= exit
->src
;
5198 /* Redirect the entry and add the phi node arguments. */
5199 redirected
= redirect_edge_and_branch (entry
, get_bb_copy (entry
->dest
));
5200 gcc_assert (redirected
!= NULL
);
5201 flush_pending_stmts (entry
);
5203 /* Concerning updating of dominators: We must recount dominators
5204 for entry block and its copy. Anything that is outside of the
5205 region, but was dominated by something inside needs recounting as
5207 set_immediate_dominator (CDI_DOMINATORS
, entry
->dest
, entry
->src
);
5208 VEC_safe_push (basic_block
, heap
, doms
, get_bb_original (entry
->dest
));
5209 iterate_fix_dominators (CDI_DOMINATORS
, doms
, false);
5210 VEC_free (basic_block
, heap
, doms
);
5212 /* Add the other PHI node arguments. */
5213 add_phi_args_after_copy (region_copy
, n_region
, NULL
);
5215 /* Update the SSA web. */
5216 update_ssa (TODO_update_ssa
);
5218 if (free_region_copy
)
5221 free_original_copy_tables ();
5225 /* Duplicates REGION consisting of N_REGION blocks. The new blocks
5226 are stored to REGION_COPY in the same order in that they appear
5227 in REGION, if REGION_COPY is not NULL. ENTRY is the entry to
5228 the region, EXIT an exit from it. The condition guarding EXIT
5229 is moved to ENTRY. Returns true if duplication succeeds, false
5255 gimple_duplicate_sese_tail (edge entry ATTRIBUTE_UNUSED
, edge exit ATTRIBUTE_UNUSED
,
5256 basic_block
*region ATTRIBUTE_UNUSED
, unsigned n_region ATTRIBUTE_UNUSED
,
5257 basic_block
*region_copy ATTRIBUTE_UNUSED
)
5260 bool free_region_copy
= false;
5261 struct loop
*loop
= exit
->dest
->loop_father
;
5262 struct loop
*orig_loop
= entry
->dest
->loop_father
;
5263 basic_block switch_bb
, entry_bb
, nentry_bb
;
5264 VEC (basic_block
, heap
) *doms
;
5265 int total_freq
= 0, exit_freq
= 0;
5266 gcov_type total_count
= 0, exit_count
= 0;
5267 edge exits
[2], nexits
[2], e
;
5268 gimple_stmt_iterator gsi
,gsi1
;
5271 basic_block exit_bb
;
5272 basic_block iters_bb
;
5274 gimple_stmt_iterator psi
;
5278 gcc_assert (EDGE_COUNT (exit
->src
->succs
) == 2);
5280 exits
[1] = EDGE_SUCC (exit
->src
, EDGE_SUCC (exit
->src
, 0) == exit
);
5282 if (!can_copy_bbs_p (region
, n_region
))
5285 initialize_original_copy_tables ();
5286 set_loop_copy (orig_loop
, loop
);
5287 duplicate_subloops (orig_loop
, loop
);
5291 region_copy
= XNEWVEC (basic_block
, n_region
);
5292 free_region_copy
= true;
5295 gcc_assert (!need_ssa_update_p (cfun
));
5297 /* Record blocks outside the region that are dominated by something
5299 doms
= get_dominated_by_region (CDI_DOMINATORS
, region
, n_region
);
5301 if (exit
->src
->count
)
5303 total_count
= exit
->src
->count
;
5304 exit_count
= exit
->count
;
5305 /* Fix up corner cases, to avoid division by zero or creation of negative
5307 if (exit_count
> total_count
)
5308 exit_count
= total_count
;
5312 total_freq
= exit
->src
->frequency
;
5313 exit_freq
= EDGE_FREQUENCY (exit
);
5314 /* Fix up corner cases, to avoid division by zero or creation of negative
5316 if (total_freq
== 0)
5318 if (exit_freq
> total_freq
)
5319 exit_freq
= total_freq
;
5322 copy_bbs (region
, n_region
, region_copy
, exits
, 2, nexits
, orig_loop
,
5323 split_edge_bb_loc (exit
));
5326 scale_bbs_frequencies_gcov_type (region
, n_region
,
5327 total_count
- exit_count
,
5329 scale_bbs_frequencies_gcov_type (region_copy
, n_region
, exit_count
,
5334 scale_bbs_frequencies_int (region
, n_region
, total_freq
- exit_freq
,
5336 scale_bbs_frequencies_int (region_copy
, n_region
, exit_freq
, total_freq
);
5339 /* Create the switch block, and put the exit condition to it. */
5340 entry_bb
= entry
->dest
;
5341 nentry_bb
= get_bb_copy (entry_bb
);
5342 if (!last_stmt (entry
->src
)
5343 || !stmt_ends_bb_p (last_stmt (entry
->src
)))
5344 switch_bb
= entry
->src
;
5346 switch_bb
= split_edge (entry
);
5347 set_immediate_dominator (CDI_DOMINATORS
, nentry_bb
, switch_bb
);
5349 gsi
= gsi_last_bb (switch_bb
);
5350 cond_stmt
= last_stmt (exit
->src
);
5351 gcc_assert (gimple_code (cond_stmt
) == GIMPLE_COND
);
5352 cond_stmt
= gimple_copy (cond_stmt
);
5354 /* If the block consisting of the exit condition has the latch as
5355 successor, then the body of the loop is executed before
5356 the exit condition is tested. In such case, moving the
5357 condition to the entry, causes that the loop will iterate
5358 one less iteration (which is the wanted outcome, since we
5359 peel out the last iteration). If the body is executed after
5360 the condition, moving the condition to the entry requires
5361 decrementing one iteration. */
5362 if (exits
[1]->dest
== orig_loop
->latch
)
5363 new_rhs
= gimple_cond_rhs (cond_stmt
);
5366 new_rhs
= fold_build2 (MINUS_EXPR
, TREE_TYPE (gimple_cond_rhs (cond_stmt
)),
5367 gimple_cond_rhs (cond_stmt
),
5368 build_int_cst (TREE_TYPE (gimple_cond_rhs (cond_stmt
)), 1));
5370 if (TREE_CODE (gimple_cond_rhs (cond_stmt
)) == SSA_NAME
)
5372 iters_bb
= gimple_bb (SSA_NAME_DEF_STMT (gimple_cond_rhs (cond_stmt
)));
5373 for (gsi1
= gsi_start_bb (iters_bb
); !gsi_end_p (gsi1
); gsi_next (&gsi1
))
5374 if (gsi_stmt (gsi1
) == SSA_NAME_DEF_STMT (gimple_cond_rhs (cond_stmt
)))
5377 new_rhs
= force_gimple_operand_gsi (&gsi1
, new_rhs
, true,
5378 NULL_TREE
,false,GSI_CONTINUE_LINKING
);
5381 gimple_cond_set_rhs (cond_stmt
, unshare_expr (new_rhs
));
5382 gimple_cond_set_lhs (cond_stmt
, unshare_expr (gimple_cond_lhs (cond_stmt
)));
5383 gsi_insert_after (&gsi
, cond_stmt
, GSI_NEW_STMT
);
5385 sorig
= single_succ_edge (switch_bb
);
5386 sorig
->flags
= exits
[1]->flags
;
5387 snew
= make_edge (switch_bb
, nentry_bb
, exits
[0]->flags
);
5389 /* Register the new edge from SWITCH_BB in loop exit lists. */
5390 rescan_loop_exit (snew
, true, false);
5392 /* Add the PHI node arguments. */
5393 add_phi_args_after_copy (region_copy
, n_region
, snew
);
5395 /* Get rid of now superfluous conditions and associated edges (and phi node
5397 exit_bb
= exit
->dest
;
5399 e
= redirect_edge_and_branch (exits
[0], exits
[1]->dest
);
5400 PENDING_STMT (e
) = NULL
;
5402 /* The latch of ORIG_LOOP was copied, and so was the backedge
5403 to the original header. We redirect this backedge to EXIT_BB. */
5404 for (i
= 0; i
< n_region
; i
++)
5405 if (get_bb_original (region_copy
[i
]) == orig_loop
->latch
)
5407 gcc_assert (single_succ_edge (region_copy
[i
]));
5408 e
= redirect_edge_and_branch (single_succ_edge (region_copy
[i
]), exit_bb
);
5409 PENDING_STMT (e
) = NULL
;
5410 for (psi
= gsi_start_phis (exit_bb
);
5414 phi
= gsi_stmt (psi
);
5415 def
= PHI_ARG_DEF (phi
, nexits
[0]->dest_idx
);
5416 add_phi_arg (phi
, def
, e
, gimple_phi_arg_location_from_edge (phi
, e
));
5419 e
= redirect_edge_and_branch (nexits
[0], nexits
[1]->dest
);
5420 PENDING_STMT (e
) = NULL
;
5422 /* Anything that is outside of the region, but was dominated by something
5423 inside needs to update dominance info. */
5424 iterate_fix_dominators (CDI_DOMINATORS
, doms
, false);
5425 VEC_free (basic_block
, heap
, doms
);
5426 /* Update the SSA web. */
5427 update_ssa (TODO_update_ssa
);
5429 if (free_region_copy
)
5432 free_original_copy_tables ();
5436 /* Add all the blocks dominated by ENTRY to the array BBS_P. Stop
5437 adding blocks when the dominator traversal reaches EXIT. This
5438 function silently assumes that ENTRY strictly dominates EXIT. */
5441 gather_blocks_in_sese_region (basic_block entry
, basic_block exit
,
5442 VEC(basic_block
,heap
) **bbs_p
)
5446 for (son
= first_dom_son (CDI_DOMINATORS
, entry
);
5448 son
= next_dom_son (CDI_DOMINATORS
, son
))
5450 VEC_safe_push (basic_block
, heap
, *bbs_p
, son
);
5452 gather_blocks_in_sese_region (son
, exit
, bbs_p
);
5456 /* Replaces *TP with a duplicate (belonging to function TO_CONTEXT).
5457 The duplicates are recorded in VARS_MAP. */
5460 replace_by_duplicate_decl (tree
*tp
, struct pointer_map_t
*vars_map
,
5463 tree t
= *tp
, new_t
;
5464 struct function
*f
= DECL_STRUCT_FUNCTION (to_context
);
5467 if (DECL_CONTEXT (t
) == to_context
)
5470 loc
= pointer_map_contains (vars_map
, t
);
5474 loc
= pointer_map_insert (vars_map
, t
);
5478 new_t
= copy_var_decl (t
, DECL_NAME (t
), TREE_TYPE (t
));
5479 f
->local_decls
= tree_cons (NULL_TREE
, new_t
, f
->local_decls
);
5483 gcc_assert (TREE_CODE (t
) == CONST_DECL
);
5484 new_t
= copy_node (t
);
5486 DECL_CONTEXT (new_t
) = to_context
;
5491 new_t
= (tree
) *loc
;
5497 /* Creates an ssa name in TO_CONTEXT equivalent to NAME.
5498 VARS_MAP maps old ssa names and var_decls to the new ones. */
5501 replace_ssa_name (tree name
, struct pointer_map_t
*vars_map
,
5505 tree new_name
, decl
= SSA_NAME_VAR (name
);
5507 gcc_assert (is_gimple_reg (name
));
5509 loc
= pointer_map_contains (vars_map
, name
);
5513 replace_by_duplicate_decl (&decl
, vars_map
, to_context
);
5515 push_cfun (DECL_STRUCT_FUNCTION (to_context
));
5516 if (gimple_in_ssa_p (cfun
))
5517 add_referenced_var (decl
);
5519 new_name
= make_ssa_name (decl
, SSA_NAME_DEF_STMT (name
));
5520 if (SSA_NAME_IS_DEFAULT_DEF (name
))
5521 set_default_def (decl
, new_name
);
5524 loc
= pointer_map_insert (vars_map
, name
);
5528 new_name
= (tree
) *loc
;
5539 struct pointer_map_t
*vars_map
;
5540 htab_t new_label_map
;
5541 struct pointer_map_t
*eh_map
;
5545 /* Helper for move_block_to_fn. Set TREE_BLOCK in every expression
5546 contained in *TP if it has been ORIG_BLOCK previously and change the
5547 DECL_CONTEXT of every local variable referenced in *TP. */
5550 move_stmt_op (tree
*tp
, int *walk_subtrees
, void *data
)
5552 struct walk_stmt_info
*wi
= (struct walk_stmt_info
*) data
;
5553 struct move_stmt_d
*p
= (struct move_stmt_d
*) wi
->info
;
5557 /* We should never have TREE_BLOCK set on non-statements. */
5558 gcc_assert (!TREE_BLOCK (t
));
5560 else if (DECL_P (t
) || TREE_CODE (t
) == SSA_NAME
)
5562 if (TREE_CODE (t
) == SSA_NAME
)
5563 *tp
= replace_ssa_name (t
, p
->vars_map
, p
->to_context
);
5564 else if (TREE_CODE (t
) == LABEL_DECL
)
5566 if (p
->new_label_map
)
5568 struct tree_map in
, *out
;
5570 out
= (struct tree_map
*)
5571 htab_find_with_hash (p
->new_label_map
, &in
, DECL_UID (t
));
5576 DECL_CONTEXT (t
) = p
->to_context
;
5578 else if (p
->remap_decls_p
)
5580 /* Replace T with its duplicate. T should no longer appear in the
5581 parent function, so this looks wasteful; however, it may appear
5582 in referenced_vars, and more importantly, as virtual operands of
5583 statements, and in alias lists of other variables. It would be
5584 quite difficult to expunge it from all those places. ??? It might
5585 suffice to do this for addressable variables. */
5586 if ((TREE_CODE (t
) == VAR_DECL
5587 && !is_global_var (t
))
5588 || TREE_CODE (t
) == CONST_DECL
)
5589 replace_by_duplicate_decl (tp
, p
->vars_map
, p
->to_context
);
5592 && gimple_in_ssa_p (cfun
))
5594 push_cfun (DECL_STRUCT_FUNCTION (p
->to_context
));
5595 add_referenced_var (*tp
);
5601 else if (TYPE_P (t
))
5607 /* Helper for move_stmt_r. Given an EH region number for the source
5608 function, map that to the duplicate EH regio number in the dest. */
5611 move_stmt_eh_region_nr (int old_nr
, struct move_stmt_d
*p
)
5613 eh_region old_r
, new_r
;
5616 old_r
= get_eh_region_from_number (old_nr
);
5617 slot
= pointer_map_contains (p
->eh_map
, old_r
);
5618 new_r
= (eh_region
) *slot
;
5620 return new_r
->index
;
5623 /* Similar, but operate on INTEGER_CSTs. */
5626 move_stmt_eh_region_tree_nr (tree old_t_nr
, struct move_stmt_d
*p
)
5630 old_nr
= tree_low_cst (old_t_nr
, 0);
5631 new_nr
= move_stmt_eh_region_nr (old_nr
, p
);
5633 return build_int_cst (NULL
, new_nr
);
5636 /* Like move_stmt_op, but for gimple statements.
5638 Helper for move_block_to_fn. Set GIMPLE_BLOCK in every expression
5639 contained in the current statement in *GSI_P and change the
5640 DECL_CONTEXT of every local variable referenced in the current
5644 move_stmt_r (gimple_stmt_iterator
*gsi_p
, bool *handled_ops_p
,
5645 struct walk_stmt_info
*wi
)
5647 struct move_stmt_d
*p
= (struct move_stmt_d
*) wi
->info
;
5648 gimple stmt
= gsi_stmt (*gsi_p
);
5649 tree block
= gimple_block (stmt
);
5651 if (p
->orig_block
== NULL_TREE
5652 || block
== p
->orig_block
5653 || block
== NULL_TREE
)
5654 gimple_set_block (stmt
, p
->new_block
);
5655 #ifdef ENABLE_CHECKING
5656 else if (block
!= p
->new_block
)
5658 while (block
&& block
!= p
->orig_block
)
5659 block
= BLOCK_SUPERCONTEXT (block
);
5664 switch (gimple_code (stmt
))
5667 /* Remap the region numbers for __builtin_eh_{pointer,filter}. */
5669 tree r
, fndecl
= gimple_call_fndecl (stmt
);
5670 if (fndecl
&& DECL_BUILT_IN_CLASS (fndecl
) == BUILT_IN_NORMAL
)
5671 switch (DECL_FUNCTION_CODE (fndecl
))
5673 case BUILT_IN_EH_COPY_VALUES
:
5674 r
= gimple_call_arg (stmt
, 1);
5675 r
= move_stmt_eh_region_tree_nr (r
, p
);
5676 gimple_call_set_arg (stmt
, 1, r
);
5679 case BUILT_IN_EH_POINTER
:
5680 case BUILT_IN_EH_FILTER
:
5681 r
= gimple_call_arg (stmt
, 0);
5682 r
= move_stmt_eh_region_tree_nr (r
, p
);
5683 gimple_call_set_arg (stmt
, 0, r
);
5694 int r
= gimple_resx_region (stmt
);
5695 r
= move_stmt_eh_region_nr (r
, p
);
5696 gimple_resx_set_region (stmt
, r
);
5700 case GIMPLE_EH_DISPATCH
:
5702 int r
= gimple_eh_dispatch_region (stmt
);
5703 r
= move_stmt_eh_region_nr (r
, p
);
5704 gimple_eh_dispatch_set_region (stmt
, r
);
5708 case GIMPLE_OMP_RETURN
:
5709 case GIMPLE_OMP_CONTINUE
:
5712 if (is_gimple_omp (stmt
))
5714 /* Do not remap variables inside OMP directives. Variables
5715 referenced in clauses and directive header belong to the
5716 parent function and should not be moved into the child
5718 bool save_remap_decls_p
= p
->remap_decls_p
;
5719 p
->remap_decls_p
= false;
5720 *handled_ops_p
= true;
5722 walk_gimple_seq (gimple_omp_body (stmt
), move_stmt_r
,
5725 p
->remap_decls_p
= save_remap_decls_p
;
5733 /* Marks virtual operands of all statements in basic blocks BBS for
5737 mark_virtual_ops_in_bb (basic_block bb
)
5739 gimple_stmt_iterator gsi
;
5741 for (gsi
= gsi_start_phis (bb
); !gsi_end_p (gsi
); gsi_next (&gsi
))
5742 mark_virtual_ops_for_renaming (gsi_stmt (gsi
));
5744 for (gsi
= gsi_start_bb (bb
); !gsi_end_p (gsi
); gsi_next (&gsi
))
5745 mark_virtual_ops_for_renaming (gsi_stmt (gsi
));
5748 /* Move basic block BB from function CFUN to function DEST_FN. The
5749 block is moved out of the original linked list and placed after
5750 block AFTER in the new list. Also, the block is removed from the
5751 original array of blocks and placed in DEST_FN's array of blocks.
5752 If UPDATE_EDGE_COUNT_P is true, the edge counts on both CFGs is
5753 updated to reflect the moved edges.
5755 The local variables are remapped to new instances, VARS_MAP is used
5756 to record the mapping. */
5759 move_block_to_fn (struct function
*dest_cfun
, basic_block bb
,
5760 basic_block after
, bool update_edge_count_p
,
5761 struct move_stmt_d
*d
)
5763 struct control_flow_graph
*cfg
;
5766 gimple_stmt_iterator si
;
5767 unsigned old_len
, new_len
;
5769 /* Remove BB from dominance structures. */
5770 delete_from_dominance_info (CDI_DOMINATORS
, bb
);
5772 remove_bb_from_loops (bb
);
5774 /* Link BB to the new linked list. */
5775 move_block_after (bb
, after
);
5777 /* Update the edge count in the corresponding flowgraphs. */
5778 if (update_edge_count_p
)
5779 FOR_EACH_EDGE (e
, ei
, bb
->succs
)
5781 cfun
->cfg
->x_n_edges
--;
5782 dest_cfun
->cfg
->x_n_edges
++;
5785 /* Remove BB from the original basic block array. */
5786 VEC_replace (basic_block
, cfun
->cfg
->x_basic_block_info
, bb
->index
, NULL
);
5787 cfun
->cfg
->x_n_basic_blocks
--;
5789 /* Grow DEST_CFUN's basic block array if needed. */
5790 cfg
= dest_cfun
->cfg
;
5791 cfg
->x_n_basic_blocks
++;
5792 if (bb
->index
>= cfg
->x_last_basic_block
)
5793 cfg
->x_last_basic_block
= bb
->index
+ 1;
5795 old_len
= VEC_length (basic_block
, cfg
->x_basic_block_info
);
5796 if ((unsigned) cfg
->x_last_basic_block
>= old_len
)
5798 new_len
= cfg
->x_last_basic_block
+ (cfg
->x_last_basic_block
+ 3) / 4;
5799 VEC_safe_grow_cleared (basic_block
, gc
, cfg
->x_basic_block_info
,
5803 VEC_replace (basic_block
, cfg
->x_basic_block_info
,
5806 /* Remap the variables in phi nodes. */
5807 for (si
= gsi_start_phis (bb
); !gsi_end_p (si
); )
5809 gimple phi
= gsi_stmt (si
);
5811 tree op
= PHI_RESULT (phi
);
5814 if (!is_gimple_reg (op
))
5816 /* Remove the phi nodes for virtual operands (alias analysis will be
5817 run for the new function, anyway). */
5818 remove_phi_node (&si
, true);
5822 SET_PHI_RESULT (phi
,
5823 replace_ssa_name (op
, d
->vars_map
, dest_cfun
->decl
));
5824 FOR_EACH_PHI_ARG (use
, phi
, oi
, SSA_OP_USE
)
5826 op
= USE_FROM_PTR (use
);
5827 if (TREE_CODE (op
) == SSA_NAME
)
5828 SET_USE (use
, replace_ssa_name (op
, d
->vars_map
, dest_cfun
->decl
));
5834 for (si
= gsi_start_bb (bb
); !gsi_end_p (si
); gsi_next (&si
))
5836 gimple stmt
= gsi_stmt (si
);
5837 struct walk_stmt_info wi
;
5839 memset (&wi
, 0, sizeof (wi
));
5841 walk_gimple_stmt (&si
, move_stmt_r
, move_stmt_op
, &wi
);
5843 if (gimple_code (stmt
) == GIMPLE_LABEL
)
5845 tree label
= gimple_label_label (stmt
);
5846 int uid
= LABEL_DECL_UID (label
);
5848 gcc_assert (uid
> -1);
5850 old_len
= VEC_length (basic_block
, cfg
->x_label_to_block_map
);
5851 if (old_len
<= (unsigned) uid
)
5853 new_len
= 3 * uid
/ 2 + 1;
5854 VEC_safe_grow_cleared (basic_block
, gc
,
5855 cfg
->x_label_to_block_map
, new_len
);
5858 VEC_replace (basic_block
, cfg
->x_label_to_block_map
, uid
, bb
);
5859 VEC_replace (basic_block
, cfun
->cfg
->x_label_to_block_map
, uid
, NULL
);
5861 gcc_assert (DECL_CONTEXT (label
) == dest_cfun
->decl
);
5863 if (uid
>= dest_cfun
->cfg
->last_label_uid
)
5864 dest_cfun
->cfg
->last_label_uid
= uid
+ 1;
5867 maybe_duplicate_eh_stmt_fn (dest_cfun
, stmt
, cfun
, stmt
, d
->eh_map
, 0);
5868 remove_stmt_from_eh_lp_fn (cfun
, stmt
);
5870 gimple_duplicate_stmt_histograms (dest_cfun
, stmt
, cfun
, stmt
);
5871 gimple_remove_stmt_histograms (cfun
, stmt
);
5873 /* We cannot leave any operands allocated from the operand caches of
5874 the current function. */
5875 free_stmt_operands (stmt
);
5876 push_cfun (dest_cfun
);
5881 FOR_EACH_EDGE (e
, ei
, bb
->succs
)
5884 tree block
= e
->goto_block
;
5885 if (d
->orig_block
== NULL_TREE
5886 || block
== d
->orig_block
)
5887 e
->goto_block
= d
->new_block
;
5888 #ifdef ENABLE_CHECKING
5889 else if (block
!= d
->new_block
)
5891 while (block
&& block
!= d
->orig_block
)
5892 block
= BLOCK_SUPERCONTEXT (block
);
5899 /* Examine the statements in BB (which is in SRC_CFUN); find and return
5900 the outermost EH region. Use REGION as the incoming base EH region. */
5903 find_outermost_region_in_block (struct function
*src_cfun
,
5904 basic_block bb
, eh_region region
)
5906 gimple_stmt_iterator si
;
5908 for (si
= gsi_start_bb (bb
); !gsi_end_p (si
); gsi_next (&si
))
5910 gimple stmt
= gsi_stmt (si
);
5911 eh_region stmt_region
;
5914 lp_nr
= lookup_stmt_eh_lp_fn (src_cfun
, stmt
);
5915 stmt_region
= get_eh_region_from_lp_number_fn (src_cfun
, lp_nr
);
5919 region
= stmt_region
;
5920 else if (stmt_region
!= region
)
5922 region
= eh_region_outermost (src_cfun
, stmt_region
, region
);
5923 gcc_assert (region
!= NULL
);
5932 new_label_mapper (tree decl
, void *data
)
5934 htab_t hash
= (htab_t
) data
;
5938 gcc_assert (TREE_CODE (decl
) == LABEL_DECL
);
5940 m
= XNEW (struct tree_map
);
5941 m
->hash
= DECL_UID (decl
);
5942 m
->base
.from
= decl
;
5943 m
->to
= create_artificial_label (UNKNOWN_LOCATION
);
5944 LABEL_DECL_UID (m
->to
) = LABEL_DECL_UID (decl
);
5945 if (LABEL_DECL_UID (m
->to
) >= cfun
->cfg
->last_label_uid
)
5946 cfun
->cfg
->last_label_uid
= LABEL_DECL_UID (m
->to
) + 1;
5948 slot
= htab_find_slot_with_hash (hash
, m
, m
->hash
, INSERT
);
5949 gcc_assert (*slot
== NULL
);
5956 /* Change DECL_CONTEXT of all BLOCK_VARS in block, including
5960 replace_block_vars_by_duplicates (tree block
, struct pointer_map_t
*vars_map
,
5965 for (tp
= &BLOCK_VARS (block
); *tp
; tp
= &TREE_CHAIN (*tp
))
5968 if (TREE_CODE (t
) != VAR_DECL
&& TREE_CODE (t
) != CONST_DECL
)
5970 replace_by_duplicate_decl (&t
, vars_map
, to_context
);
5973 if (TREE_CODE (*tp
) == VAR_DECL
&& DECL_HAS_VALUE_EXPR_P (*tp
))
5975 SET_DECL_VALUE_EXPR (t
, DECL_VALUE_EXPR (*tp
));
5976 DECL_HAS_VALUE_EXPR_P (t
) = 1;
5978 TREE_CHAIN (t
) = TREE_CHAIN (*tp
);
5983 for (block
= BLOCK_SUBBLOCKS (block
); block
; block
= BLOCK_CHAIN (block
))
5984 replace_block_vars_by_duplicates (block
, vars_map
, to_context
);
5987 /* Move a single-entry, single-exit region delimited by ENTRY_BB and
5988 EXIT_BB to function DEST_CFUN. The whole region is replaced by a
5989 single basic block in the original CFG and the new basic block is
5990 returned. DEST_CFUN must not have a CFG yet.
5992 Note that the region need not be a pure SESE region. Blocks inside
5993 the region may contain calls to abort/exit. The only restriction
5994 is that ENTRY_BB should be the only entry point and it must
5997 Change TREE_BLOCK of all statements in ORIG_BLOCK to the new
5998 functions outermost BLOCK, move all subblocks of ORIG_BLOCK
5999 to the new function.
6001 All local variables referenced in the region are assumed to be in
6002 the corresponding BLOCK_VARS and unexpanded variable lists
6003 associated with DEST_CFUN. */
6006 move_sese_region_to_fn (struct function
*dest_cfun
, basic_block entry_bb
,
6007 basic_block exit_bb
, tree orig_block
)
6009 VEC(basic_block
,heap
) *bbs
, *dom_bbs
;
6010 basic_block dom_entry
= get_immediate_dominator (CDI_DOMINATORS
, entry_bb
);
6011 basic_block after
, bb
, *entry_pred
, *exit_succ
, abb
;
6012 struct function
*saved_cfun
= cfun
;
6013 int *entry_flag
, *exit_flag
;
6014 unsigned *entry_prob
, *exit_prob
;
6015 unsigned i
, num_entry_edges
, num_exit_edges
;
6018 htab_t new_label_map
;
6019 struct pointer_map_t
*vars_map
, *eh_map
;
6020 struct loop
*loop
= entry_bb
->loop_father
;
6021 struct move_stmt_d d
;
6023 /* If ENTRY does not strictly dominate EXIT, this cannot be an SESE
6025 gcc_assert (entry_bb
!= exit_bb
6027 || dominated_by_p (CDI_DOMINATORS
, exit_bb
, entry_bb
)));
6029 /* Collect all the blocks in the region. Manually add ENTRY_BB
6030 because it won't be added by dfs_enumerate_from. */
6032 VEC_safe_push (basic_block
, heap
, bbs
, entry_bb
);
6033 gather_blocks_in_sese_region (entry_bb
, exit_bb
, &bbs
);
6035 /* The blocks that used to be dominated by something in BBS will now be
6036 dominated by the new block. */
6037 dom_bbs
= get_dominated_by_region (CDI_DOMINATORS
,
6038 VEC_address (basic_block
, bbs
),
6039 VEC_length (basic_block
, bbs
));
6041 /* Detach ENTRY_BB and EXIT_BB from CFUN->CFG. We need to remember
6042 the predecessor edges to ENTRY_BB and the successor edges to
6043 EXIT_BB so that we can re-attach them to the new basic block that
6044 will replace the region. */
6045 num_entry_edges
= EDGE_COUNT (entry_bb
->preds
);
6046 entry_pred
= (basic_block
*) xcalloc (num_entry_edges
, sizeof (basic_block
));
6047 entry_flag
= (int *) xcalloc (num_entry_edges
, sizeof (int));
6048 entry_prob
= XNEWVEC (unsigned, num_entry_edges
);
6050 for (ei
= ei_start (entry_bb
->preds
); (e
= ei_safe_edge (ei
)) != NULL
;)
6052 entry_prob
[i
] = e
->probability
;
6053 entry_flag
[i
] = e
->flags
;
6054 entry_pred
[i
++] = e
->src
;
6060 num_exit_edges
= EDGE_COUNT (exit_bb
->succs
);
6061 exit_succ
= (basic_block
*) xcalloc (num_exit_edges
,
6062 sizeof (basic_block
));
6063 exit_flag
= (int *) xcalloc (num_exit_edges
, sizeof (int));
6064 exit_prob
= XNEWVEC (unsigned, num_exit_edges
);
6066 for (ei
= ei_start (exit_bb
->succs
); (e
= ei_safe_edge (ei
)) != NULL
;)
6068 exit_prob
[i
] = e
->probability
;
6069 exit_flag
[i
] = e
->flags
;
6070 exit_succ
[i
++] = e
->dest
;
6082 /* Switch context to the child function to initialize DEST_FN's CFG. */
6083 gcc_assert (dest_cfun
->cfg
== NULL
);
6084 push_cfun (dest_cfun
);
6086 init_empty_tree_cfg ();
6088 /* Initialize EH information for the new function. */
6090 new_label_map
= NULL
;
6093 eh_region region
= NULL
;
6095 for (i
= 0; VEC_iterate (basic_block
, bbs
, i
, bb
); i
++)
6096 region
= find_outermost_region_in_block (saved_cfun
, bb
, region
);
6098 init_eh_for_function ();
6101 new_label_map
= htab_create (17, tree_map_hash
, tree_map_eq
, free
);
6102 eh_map
= duplicate_eh_regions (saved_cfun
, region
, 0,
6103 new_label_mapper
, new_label_map
);
6109 /* Move blocks from BBS into DEST_CFUN. */
6110 gcc_assert (VEC_length (basic_block
, bbs
) >= 2);
6111 after
= dest_cfun
->cfg
->x_entry_block_ptr
;
6112 vars_map
= pointer_map_create ();
6114 memset (&d
, 0, sizeof (d
));
6115 d
.orig_block
= orig_block
;
6116 d
.new_block
= DECL_INITIAL (dest_cfun
->decl
);
6117 d
.from_context
= cfun
->decl
;
6118 d
.to_context
= dest_cfun
->decl
;
6119 d
.vars_map
= vars_map
;
6120 d
.new_label_map
= new_label_map
;
6122 d
.remap_decls_p
= true;
6124 for (i
= 0; VEC_iterate (basic_block
, bbs
, i
, bb
); i
++)
6126 /* No need to update edge counts on the last block. It has
6127 already been updated earlier when we detached the region from
6128 the original CFG. */
6129 move_block_to_fn (dest_cfun
, bb
, after
, bb
!= exit_bb
, &d
);
6133 /* Rewire BLOCK_SUBBLOCKS of orig_block. */
6137 gcc_assert (BLOCK_SUBBLOCKS (DECL_INITIAL (dest_cfun
->decl
))
6139 BLOCK_SUBBLOCKS (DECL_INITIAL (dest_cfun
->decl
))
6140 = BLOCK_SUBBLOCKS (orig_block
);
6141 for (block
= BLOCK_SUBBLOCKS (orig_block
);
6142 block
; block
= BLOCK_CHAIN (block
))
6143 BLOCK_SUPERCONTEXT (block
) = DECL_INITIAL (dest_cfun
->decl
);
6144 BLOCK_SUBBLOCKS (orig_block
) = NULL_TREE
;
6147 replace_block_vars_by_duplicates (DECL_INITIAL (dest_cfun
->decl
),
6148 vars_map
, dest_cfun
->decl
);
6151 htab_delete (new_label_map
);
6153 pointer_map_destroy (eh_map
);
6154 pointer_map_destroy (vars_map
);
6156 /* Rewire the entry and exit blocks. The successor to the entry
6157 block turns into the successor of DEST_FN's ENTRY_BLOCK_PTR in
6158 the child function. Similarly, the predecessor of DEST_FN's
6159 EXIT_BLOCK_PTR turns into the predecessor of EXIT_BLOCK_PTR. We
6160 need to switch CFUN between DEST_CFUN and SAVED_CFUN so that the
6161 various CFG manipulation function get to the right CFG.
6163 FIXME, this is silly. The CFG ought to become a parameter to
6165 push_cfun (dest_cfun
);
6166 make_edge (ENTRY_BLOCK_PTR
, entry_bb
, EDGE_FALLTHRU
);
6168 make_edge (exit_bb
, EXIT_BLOCK_PTR
, 0);
6171 /* Back in the original function, the SESE region has disappeared,
6172 create a new basic block in its place. */
6173 bb
= create_empty_bb (entry_pred
[0]);
6175 add_bb_to_loop (bb
, loop
);
6176 for (i
= 0; i
< num_entry_edges
; i
++)
6178 e
= make_edge (entry_pred
[i
], bb
, entry_flag
[i
]);
6179 e
->probability
= entry_prob
[i
];
6182 for (i
= 0; i
< num_exit_edges
; i
++)
6184 e
= make_edge (bb
, exit_succ
[i
], exit_flag
[i
]);
6185 e
->probability
= exit_prob
[i
];
6188 set_immediate_dominator (CDI_DOMINATORS
, bb
, dom_entry
);
6189 for (i
= 0; VEC_iterate (basic_block
, dom_bbs
, i
, abb
); i
++)
6190 set_immediate_dominator (CDI_DOMINATORS
, abb
, bb
);
6191 VEC_free (basic_block
, heap
, dom_bbs
);
6202 VEC_free (basic_block
, heap
, bbs
);
6208 /* Dump FUNCTION_DECL FN to file FILE using FLAGS (see TDF_* in tree-pass.h)
6212 dump_function_to_file (tree fn
, FILE *file
, int flags
)
6214 tree arg
, vars
, var
;
6215 struct function
*dsf
;
6216 bool ignore_topmost_bind
= false, any_var
= false;
6220 fprintf (file
, "%s (", lang_hooks
.decl_printable_name (fn
, 2));
6222 arg
= DECL_ARGUMENTS (fn
);
6225 print_generic_expr (file
, TREE_TYPE (arg
), dump_flags
);
6226 fprintf (file
, " ");
6227 print_generic_expr (file
, arg
, dump_flags
);
6228 if (flags
& TDF_VERBOSE
)
6229 print_node (file
, "", arg
, 4);
6230 if (TREE_CHAIN (arg
))
6231 fprintf (file
, ", ");
6232 arg
= TREE_CHAIN (arg
);
6234 fprintf (file
, ")\n");
6236 if (flags
& TDF_VERBOSE
)
6237 print_node (file
, "", fn
, 2);
6239 dsf
= DECL_STRUCT_FUNCTION (fn
);
6240 if (dsf
&& (flags
& TDF_EH
))
6241 dump_eh_tree (file
, dsf
);
6243 if (flags
& TDF_RAW
&& !gimple_has_body_p (fn
))
6245 dump_node (fn
, TDF_SLIM
| flags
, file
);
6249 /* Switch CFUN to point to FN. */
6250 push_cfun (DECL_STRUCT_FUNCTION (fn
));
6252 /* When GIMPLE is lowered, the variables are no longer available in
6253 BIND_EXPRs, so display them separately. */
6254 if (cfun
&& cfun
->decl
== fn
&& cfun
->local_decls
)
6256 ignore_topmost_bind
= true;
6258 fprintf (file
, "{\n");
6259 for (vars
= cfun
->local_decls
; vars
; vars
= TREE_CHAIN (vars
))
6261 var
= TREE_VALUE (vars
);
6263 print_generic_decl (file
, var
, flags
);
6264 if (flags
& TDF_VERBOSE
)
6265 print_node (file
, "", var
, 4);
6266 fprintf (file
, "\n");
6272 if (cfun
&& cfun
->decl
== fn
&& cfun
->cfg
&& basic_block_info
)
6274 /* If the CFG has been built, emit a CFG-based dump. */
6275 check_bb_profile (ENTRY_BLOCK_PTR
, file
);
6276 if (!ignore_topmost_bind
)
6277 fprintf (file
, "{\n");
6279 if (any_var
&& n_basic_blocks
)
6280 fprintf (file
, "\n");
6283 gimple_dump_bb (bb
, file
, 2, flags
);
6285 fprintf (file
, "}\n");
6286 check_bb_profile (EXIT_BLOCK_PTR
, file
);
6288 else if (DECL_SAVED_TREE (fn
) == NULL
)
6290 /* The function is now in GIMPLE form but the CFG has not been
6291 built yet. Emit the single sequence of GIMPLE statements
6292 that make up its body. */
6293 gimple_seq body
= gimple_body (fn
);
6295 if (gimple_seq_first_stmt (body
)
6296 && gimple_seq_first_stmt (body
) == gimple_seq_last_stmt (body
)
6297 && gimple_code (gimple_seq_first_stmt (body
)) == GIMPLE_BIND
)
6298 print_gimple_seq (file
, body
, 0, flags
);
6301 if (!ignore_topmost_bind
)
6302 fprintf (file
, "{\n");
6305 fprintf (file
, "\n");
6307 print_gimple_seq (file
, body
, 2, flags
);
6308 fprintf (file
, "}\n");
6315 /* Make a tree based dump. */
6316 chain
= DECL_SAVED_TREE (fn
);
6318 if (chain
&& TREE_CODE (chain
) == BIND_EXPR
)
6320 if (ignore_topmost_bind
)
6322 chain
= BIND_EXPR_BODY (chain
);
6330 if (!ignore_topmost_bind
)
6331 fprintf (file
, "{\n");
6336 fprintf (file
, "\n");
6338 print_generic_stmt_indented (file
, chain
, flags
, indent
);
6339 if (ignore_topmost_bind
)
6340 fprintf (file
, "}\n");
6343 fprintf (file
, "\n\n");
6350 /* Dump FUNCTION_DECL FN to stderr using FLAGS (see TDF_* in tree.h) */
6353 debug_function (tree fn
, int flags
)
6355 dump_function_to_file (fn
, stderr
, flags
);
6359 /* Print on FILE the indexes for the predecessors of basic_block BB. */
6362 print_pred_bbs (FILE *file
, basic_block bb
)
6367 FOR_EACH_EDGE (e
, ei
, bb
->preds
)
6368 fprintf (file
, "bb_%d ", e
->src
->index
);
6372 /* Print on FILE the indexes for the successors of basic_block BB. */
6375 print_succ_bbs (FILE *file
, basic_block bb
)
6380 FOR_EACH_EDGE (e
, ei
, bb
->succs
)
6381 fprintf (file
, "bb_%d ", e
->dest
->index
);
6384 /* Print to FILE the basic block BB following the VERBOSITY level. */
6387 print_loops_bb (FILE *file
, basic_block bb
, int indent
, int verbosity
)
6389 char *s_indent
= (char *) alloca ((size_t) indent
+ 1);
6390 memset ((void *) s_indent
, ' ', (size_t) indent
);
6391 s_indent
[indent
] = '\0';
6393 /* Print basic_block's header. */
6396 fprintf (file
, "%s bb_%d (preds = {", s_indent
, bb
->index
);
6397 print_pred_bbs (file
, bb
);
6398 fprintf (file
, "}, succs = {");
6399 print_succ_bbs (file
, bb
);
6400 fprintf (file
, "})\n");
6403 /* Print basic_block's body. */
6406 fprintf (file
, "%s {\n", s_indent
);
6407 gimple_dump_bb (bb
, file
, indent
+ 4, TDF_VOPS
|TDF_MEMSYMS
);
6408 fprintf (file
, "%s }\n", s_indent
);
6412 static void print_loop_and_siblings (FILE *, struct loop
*, int, int);
6414 /* Pretty print LOOP on FILE, indented INDENT spaces. Following
6415 VERBOSITY level this outputs the contents of the loop, or just its
6419 print_loop (FILE *file
, struct loop
*loop
, int indent
, int verbosity
)
6427 s_indent
= (char *) alloca ((size_t) indent
+ 1);
6428 memset ((void *) s_indent
, ' ', (size_t) indent
);
6429 s_indent
[indent
] = '\0';
6431 /* Print loop's header. */
6432 fprintf (file
, "%sloop_%d (header = %d, latch = %d", s_indent
,
6433 loop
->num
, loop
->header
->index
, loop
->latch
->index
);
6434 fprintf (file
, ", niter = ");
6435 print_generic_expr (file
, loop
->nb_iterations
, 0);
6437 if (loop
->any_upper_bound
)
6439 fprintf (file
, ", upper_bound = ");
6440 dump_double_int (file
, loop
->nb_iterations_upper_bound
, true);
6443 if (loop
->any_estimate
)
6445 fprintf (file
, ", estimate = ");
6446 dump_double_int (file
, loop
->nb_iterations_estimate
, true);
6448 fprintf (file
, ")\n");
6450 /* Print loop's body. */
6453 fprintf (file
, "%s{\n", s_indent
);
6455 if (bb
->loop_father
== loop
)
6456 print_loops_bb (file
, bb
, indent
, verbosity
);
6458 print_loop_and_siblings (file
, loop
->inner
, indent
+ 2, verbosity
);
6459 fprintf (file
, "%s}\n", s_indent
);
6463 /* Print the LOOP and its sibling loops on FILE, indented INDENT
6464 spaces. Following VERBOSITY level this outputs the contents of the
6465 loop, or just its structure. */
6468 print_loop_and_siblings (FILE *file
, struct loop
*loop
, int indent
, int verbosity
)
6473 print_loop (file
, loop
, indent
, verbosity
);
6474 print_loop_and_siblings (file
, loop
->next
, indent
, verbosity
);
6477 /* Follow a CFG edge from the entry point of the program, and on entry
6478 of a loop, pretty print the loop structure on FILE. */
6481 print_loops (FILE *file
, int verbosity
)
6485 bb
= ENTRY_BLOCK_PTR
;
6486 if (bb
&& bb
->loop_father
)
6487 print_loop_and_siblings (file
, bb
->loop_father
, 0, verbosity
);
6491 /* Debugging loops structure at tree level, at some VERBOSITY level. */
6494 debug_loops (int verbosity
)
6496 print_loops (stderr
, verbosity
);
6499 /* Print on stderr the code of LOOP, at some VERBOSITY level. */
6502 debug_loop (struct loop
*loop
, int verbosity
)
6504 print_loop (stderr
, loop
, 0, verbosity
);
6507 /* Print on stderr the code of loop number NUM, at some VERBOSITY
6511 debug_loop_num (unsigned num
, int verbosity
)
6513 debug_loop (get_loop (num
), verbosity
);
6516 /* Return true if BB ends with a call, possibly followed by some
6517 instructions that must stay with the call. Return false,
6521 gimple_block_ends_with_call_p (basic_block bb
)
6523 gimple_stmt_iterator gsi
= gsi_last_nondebug_bb (bb
);
6524 return is_gimple_call (gsi_stmt (gsi
));
6528 /* Return true if BB ends with a conditional branch. Return false,
6532 gimple_block_ends_with_condjump_p (const_basic_block bb
)
6534 gimple stmt
= last_stmt (CONST_CAST_BB (bb
));
6535 return (stmt
&& gimple_code (stmt
) == GIMPLE_COND
);
6539 /* Return true if we need to add fake edge to exit at statement T.
6540 Helper function for gimple_flow_call_edges_add. */
6543 need_fake_edge_p (gimple t
)
6545 tree fndecl
= NULL_TREE
;
6548 /* NORETURN and LONGJMP calls already have an edge to exit.
6549 CONST and PURE calls do not need one.
6550 We don't currently check for CONST and PURE here, although
6551 it would be a good idea, because those attributes are
6552 figured out from the RTL in mark_constant_function, and
6553 the counter incrementation code from -fprofile-arcs
6554 leads to different results from -fbranch-probabilities. */
6555 if (is_gimple_call (t
))
6557 fndecl
= gimple_call_fndecl (t
);
6558 call_flags
= gimple_call_flags (t
);
6561 if (is_gimple_call (t
)
6563 && DECL_BUILT_IN (fndecl
)
6564 && (call_flags
& ECF_NOTHROW
)
6565 && !(call_flags
& ECF_RETURNS_TWICE
)
6566 /* fork() doesn't really return twice, but the effect of
6567 wrapping it in __gcov_fork() which calls __gcov_flush()
6568 and clears the counters before forking has the same
6569 effect as returning twice. Force a fake edge. */
6570 && !(DECL_BUILT_IN_CLASS (fndecl
) == BUILT_IN_NORMAL
6571 && DECL_FUNCTION_CODE (fndecl
) == BUILT_IN_FORK
))
6574 if (is_gimple_call (t
)
6575 && !(call_flags
& ECF_NORETURN
))
6578 if (gimple_code (t
) == GIMPLE_ASM
6579 && (gimple_asm_volatile_p (t
) || gimple_asm_input_p (t
)))
6586 /* Add fake edges to the function exit for any non constant and non
6587 noreturn calls, volatile inline assembly in the bitmap of blocks
6588 specified by BLOCKS or to the whole CFG if BLOCKS is zero. Return
6589 the number of blocks that were split.
6591 The goal is to expose cases in which entering a basic block does
6592 not imply that all subsequent instructions must be executed. */
6595 gimple_flow_call_edges_add (sbitmap blocks
)
6598 int blocks_split
= 0;
6599 int last_bb
= last_basic_block
;
6600 bool check_last_block
= false;
6602 if (n_basic_blocks
== NUM_FIXED_BLOCKS
)
6606 check_last_block
= true;
6608 check_last_block
= TEST_BIT (blocks
, EXIT_BLOCK_PTR
->prev_bb
->index
);
6610 /* In the last basic block, before epilogue generation, there will be
6611 a fallthru edge to EXIT. Special care is required if the last insn
6612 of the last basic block is a call because make_edge folds duplicate
6613 edges, which would result in the fallthru edge also being marked
6614 fake, which would result in the fallthru edge being removed by
6615 remove_fake_edges, which would result in an invalid CFG.
6617 Moreover, we can't elide the outgoing fake edge, since the block
6618 profiler needs to take this into account in order to solve the minimal
6619 spanning tree in the case that the call doesn't return.
6621 Handle this by adding a dummy instruction in a new last basic block. */
6622 if (check_last_block
)
6624 basic_block bb
= EXIT_BLOCK_PTR
->prev_bb
;
6625 gimple_stmt_iterator gsi
= gsi_last_bb (bb
);
6628 if (!gsi_end_p (gsi
))
6631 if (t
&& need_fake_edge_p (t
))
6635 e
= find_edge (bb
, EXIT_BLOCK_PTR
);
6638 gsi_insert_on_edge (e
, gimple_build_nop ());
6639 gsi_commit_edge_inserts ();
6644 /* Now add fake edges to the function exit for any non constant
6645 calls since there is no way that we can determine if they will
6647 for (i
= 0; i
< last_bb
; i
++)
6649 basic_block bb
= BASIC_BLOCK (i
);
6650 gimple_stmt_iterator gsi
;
6651 gimple stmt
, last_stmt
;
6656 if (blocks
&& !TEST_BIT (blocks
, i
))
6659 gsi
= gsi_last_bb (bb
);
6660 if (!gsi_end_p (gsi
))
6662 last_stmt
= gsi_stmt (gsi
);
6665 stmt
= gsi_stmt (gsi
);
6666 if (need_fake_edge_p (stmt
))
6670 /* The handling above of the final block before the
6671 epilogue should be enough to verify that there is
6672 no edge to the exit block in CFG already.
6673 Calling make_edge in such case would cause us to
6674 mark that edge as fake and remove it later. */
6675 #ifdef ENABLE_CHECKING
6676 if (stmt
== last_stmt
)
6678 e
= find_edge (bb
, EXIT_BLOCK_PTR
);
6679 gcc_assert (e
== NULL
);
6683 /* Note that the following may create a new basic block
6684 and renumber the existing basic blocks. */
6685 if (stmt
!= last_stmt
)
6687 e
= split_block (bb
, stmt
);
6691 make_edge (bb
, EXIT_BLOCK_PTR
, EDGE_FAKE
);
6695 while (!gsi_end_p (gsi
));
6700 verify_flow_info ();
6702 return blocks_split
;
6705 /* Purge dead abnormal call edges from basic block BB. */
6708 gimple_purge_dead_abnormal_call_edges (basic_block bb
)
6710 bool changed
= gimple_purge_dead_eh_edges (bb
);
6712 if (cfun
->has_nonlocal_label
)
6714 gimple stmt
= last_stmt (bb
);
6718 if (!(stmt
&& stmt_can_make_abnormal_goto (stmt
)))
6719 for (ei
= ei_start (bb
->succs
); (e
= ei_safe_edge (ei
)); )
6721 if (e
->flags
& EDGE_ABNORMAL
)
6730 /* See gimple_purge_dead_eh_edges below. */
6732 free_dominance_info (CDI_DOMINATORS
);
6738 /* Removes edge E and all the blocks dominated by it, and updates dominance
6739 information. The IL in E->src needs to be updated separately.
6740 If dominance info is not available, only the edge E is removed.*/
6743 remove_edge_and_dominated_blocks (edge e
)
6745 VEC (basic_block
, heap
) *bbs_to_remove
= NULL
;
6746 VEC (basic_block
, heap
) *bbs_to_fix_dom
= NULL
;
6750 bool none_removed
= false;
6752 basic_block bb
, dbb
;
6755 if (!dom_info_available_p (CDI_DOMINATORS
))
6761 /* No updating is needed for edges to exit. */
6762 if (e
->dest
== EXIT_BLOCK_PTR
)
6764 if (cfgcleanup_altered_bbs
)
6765 bitmap_set_bit (cfgcleanup_altered_bbs
, e
->src
->index
);
6770 /* First, we find the basic blocks to remove. If E->dest has a predecessor
6771 that is not dominated by E->dest, then this set is empty. Otherwise,
6772 all the basic blocks dominated by E->dest are removed.
6774 Also, to DF_IDOM we store the immediate dominators of the blocks in
6775 the dominance frontier of E (i.e., of the successors of the
6776 removed blocks, if there are any, and of E->dest otherwise). */
6777 FOR_EACH_EDGE (f
, ei
, e
->dest
->preds
)
6782 if (!dominated_by_p (CDI_DOMINATORS
, f
->src
, e
->dest
))
6784 none_removed
= true;
6789 df
= BITMAP_ALLOC (NULL
);
6790 df_idom
= BITMAP_ALLOC (NULL
);
6793 bitmap_set_bit (df_idom
,
6794 get_immediate_dominator (CDI_DOMINATORS
, e
->dest
)->index
);
6797 bbs_to_remove
= get_all_dominated_blocks (CDI_DOMINATORS
, e
->dest
);
6798 for (i
= 0; VEC_iterate (basic_block
, bbs_to_remove
, i
, bb
); i
++)
6800 FOR_EACH_EDGE (f
, ei
, bb
->succs
)
6802 if (f
->dest
!= EXIT_BLOCK_PTR
)
6803 bitmap_set_bit (df
, f
->dest
->index
);
6806 for (i
= 0; VEC_iterate (basic_block
, bbs_to_remove
, i
, bb
); i
++)
6807 bitmap_clear_bit (df
, bb
->index
);
6809 EXECUTE_IF_SET_IN_BITMAP (df
, 0, i
, bi
)
6811 bb
= BASIC_BLOCK (i
);
6812 bitmap_set_bit (df_idom
,
6813 get_immediate_dominator (CDI_DOMINATORS
, bb
)->index
);
6817 if (cfgcleanup_altered_bbs
)
6819 /* Record the set of the altered basic blocks. */
6820 bitmap_set_bit (cfgcleanup_altered_bbs
, e
->src
->index
);
6821 bitmap_ior_into (cfgcleanup_altered_bbs
, df
);
6824 /* Remove E and the cancelled blocks. */
6829 /* Walk backwards so as to get a chance to substitute all
6830 released DEFs into debug stmts. See
6831 eliminate_unnecessary_stmts() in tree-ssa-dce.c for more
6833 for (i
= VEC_length (basic_block
, bbs_to_remove
); i
-- > 0; )
6834 delete_basic_block (VEC_index (basic_block
, bbs_to_remove
, i
));
6837 /* Update the dominance information. The immediate dominator may change only
6838 for blocks whose immediate dominator belongs to DF_IDOM:
6840 Suppose that idom(X) = Y before removal of E and idom(X) != Y after the
6841 removal. Let Z the arbitrary block such that idom(Z) = Y and
6842 Z dominates X after the removal. Before removal, there exists a path P
6843 from Y to X that avoids Z. Let F be the last edge on P that is
6844 removed, and let W = F->dest. Before removal, idom(W) = Y (since Y
6845 dominates W, and because of P, Z does not dominate W), and W belongs to
6846 the dominance frontier of E. Therefore, Y belongs to DF_IDOM. */
6847 EXECUTE_IF_SET_IN_BITMAP (df_idom
, 0, i
, bi
)
6849 bb
= BASIC_BLOCK (i
);
6850 for (dbb
= first_dom_son (CDI_DOMINATORS
, bb
);
6852 dbb
= next_dom_son (CDI_DOMINATORS
, dbb
))
6853 VEC_safe_push (basic_block
, heap
, bbs_to_fix_dom
, dbb
);
6856 iterate_fix_dominators (CDI_DOMINATORS
, bbs_to_fix_dom
, true);
6859 BITMAP_FREE (df_idom
);
6860 VEC_free (basic_block
, heap
, bbs_to_remove
);
6861 VEC_free (basic_block
, heap
, bbs_to_fix_dom
);
6864 /* Purge dead EH edges from basic block BB. */
6867 gimple_purge_dead_eh_edges (basic_block bb
)
6869 bool changed
= false;
6872 gimple stmt
= last_stmt (bb
);
6874 if (stmt
&& stmt_can_throw_internal (stmt
))
6877 for (ei
= ei_start (bb
->succs
); (e
= ei_safe_edge (ei
)); )
6879 if (e
->flags
& EDGE_EH
)
6881 remove_edge_and_dominated_blocks (e
);
6892 gimple_purge_all_dead_eh_edges (const_bitmap blocks
)
6894 bool changed
= false;
6898 EXECUTE_IF_SET_IN_BITMAP (blocks
, 0, i
, bi
)
6900 basic_block bb
= BASIC_BLOCK (i
);
6902 /* Earlier gimple_purge_dead_eh_edges could have removed
6903 this basic block already. */
6904 gcc_assert (bb
|| changed
);
6906 changed
|= gimple_purge_dead_eh_edges (bb
);
6912 /* This function is called whenever a new edge is created or
6916 gimple_execute_on_growing_pred (edge e
)
6918 basic_block bb
= e
->dest
;
6920 if (!gimple_seq_empty_p (phi_nodes (bb
)))
6921 reserve_phi_args_for_new_edge (bb
);
6924 /* This function is called immediately before edge E is removed from
6925 the edge vector E->dest->preds. */
6928 gimple_execute_on_shrinking_pred (edge e
)
6930 if (!gimple_seq_empty_p (phi_nodes (e
->dest
)))
6931 remove_phi_args (e
);
6934 /*---------------------------------------------------------------------------
6935 Helper functions for Loop versioning
6936 ---------------------------------------------------------------------------*/
6938 /* Adjust phi nodes for 'first' basic block. 'second' basic block is a copy
6939 of 'first'. Both of them are dominated by 'new_head' basic block. When
6940 'new_head' was created by 'second's incoming edge it received phi arguments
6941 on the edge by split_edge(). Later, additional edge 'e' was created to
6942 connect 'new_head' and 'first'. Now this routine adds phi args on this
6943 additional edge 'e' that new_head to second edge received as part of edge
6947 gimple_lv_adjust_loop_header_phi (basic_block first
, basic_block second
,
6948 basic_block new_head
, edge e
)
6951 gimple_stmt_iterator psi1
, psi2
;
6953 edge e2
= find_edge (new_head
, second
);
6955 /* Because NEW_HEAD has been created by splitting SECOND's incoming
6956 edge, we should always have an edge from NEW_HEAD to SECOND. */
6957 gcc_assert (e2
!= NULL
);
6959 /* Browse all 'second' basic block phi nodes and add phi args to
6960 edge 'e' for 'first' head. PHI args are always in correct order. */
6962 for (psi2
= gsi_start_phis (second
),
6963 psi1
= gsi_start_phis (first
);
6964 !gsi_end_p (psi2
) && !gsi_end_p (psi1
);
6965 gsi_next (&psi2
), gsi_next (&psi1
))
6967 phi1
= gsi_stmt (psi1
);
6968 phi2
= gsi_stmt (psi2
);
6969 def
= PHI_ARG_DEF (phi2
, e2
->dest_idx
);
6970 add_phi_arg (phi1
, def
, e
, gimple_phi_arg_location_from_edge (phi2
, e2
));
6975 /* Adds a if else statement to COND_BB with condition COND_EXPR.
6976 SECOND_HEAD is the destination of the THEN and FIRST_HEAD is
6977 the destination of the ELSE part. */
6980 gimple_lv_add_condition_to_bb (basic_block first_head ATTRIBUTE_UNUSED
,
6981 basic_block second_head ATTRIBUTE_UNUSED
,
6982 basic_block cond_bb
, void *cond_e
)
6984 gimple_stmt_iterator gsi
;
6985 gimple new_cond_expr
;
6986 tree cond_expr
= (tree
) cond_e
;
6989 /* Build new conditional expr */
6990 new_cond_expr
= gimple_build_cond_from_tree (cond_expr
,
6991 NULL_TREE
, NULL_TREE
);
6993 /* Add new cond in cond_bb. */
6994 gsi
= gsi_last_bb (cond_bb
);
6995 gsi_insert_after (&gsi
, new_cond_expr
, GSI_NEW_STMT
);
6997 /* Adjust edges appropriately to connect new head with first head
6998 as well as second head. */
6999 e0
= single_succ_edge (cond_bb
);
7000 e0
->flags
&= ~EDGE_FALLTHRU
;
7001 e0
->flags
|= EDGE_FALSE_VALUE
;
7004 struct cfg_hooks gimple_cfg_hooks
= {
7006 gimple_verify_flow_info
,
7007 gimple_dump_bb
, /* dump_bb */
7008 create_bb
, /* create_basic_block */
7009 gimple_redirect_edge_and_branch
, /* redirect_edge_and_branch */
7010 gimple_redirect_edge_and_branch_force
, /* redirect_edge_and_branch_force */
7011 gimple_can_remove_branch_p
, /* can_remove_branch_p */
7012 remove_bb
, /* delete_basic_block */
7013 gimple_split_block
, /* split_block */
7014 gimple_move_block_after
, /* move_block_after */
7015 gimple_can_merge_blocks_p
, /* can_merge_blocks_p */
7016 gimple_merge_blocks
, /* merge_blocks */
7017 gimple_predict_edge
, /* predict_edge */
7018 gimple_predicted_by_p
, /* predicted_by_p */
7019 gimple_can_duplicate_bb_p
, /* can_duplicate_block_p */
7020 gimple_duplicate_bb
, /* duplicate_block */
7021 gimple_split_edge
, /* split_edge */
7022 gimple_make_forwarder_block
, /* make_forward_block */
7023 NULL
, /* tidy_fallthru_edge */
7024 gimple_block_ends_with_call_p
,/* block_ends_with_call_p */
7025 gimple_block_ends_with_condjump_p
, /* block_ends_with_condjump_p */
7026 gimple_flow_call_edges_add
, /* flow_call_edges_add */
7027 gimple_execute_on_growing_pred
, /* execute_on_growing_pred */
7028 gimple_execute_on_shrinking_pred
, /* execute_on_shrinking_pred */
7029 gimple_duplicate_loop_to_header_edge
, /* duplicate loop for trees */
7030 gimple_lv_add_condition_to_bb
, /* lv_add_condition_to_bb */
7031 gimple_lv_adjust_loop_header_phi
, /* lv_adjust_loop_header_phi*/
7032 extract_true_false_edges_from_block
, /* extract_cond_bb_edges */
7033 flush_pending_stmts
/* flush_pending_stmts */
7037 /* Split all critical edges. */
7040 split_critical_edges (void)
7046 /* split_edge can redirect edges out of SWITCH_EXPRs, which can get
7047 expensive. So we want to enable recording of edge to CASE_LABEL_EXPR
7048 mappings around the calls to split_edge. */
7049 start_recording_case_labels ();
7052 FOR_EACH_EDGE (e
, ei
, bb
->succs
)
7054 if (EDGE_CRITICAL_P (e
) && !(e
->flags
& EDGE_ABNORMAL
))
7056 /* PRE inserts statements to edges and expects that
7057 since split_critical_edges was done beforehand, committing edge
7058 insertions will not split more edges. In addition to critical
7059 edges we must split edges that have multiple successors and
7060 end by control flow statements, such as RESX.
7061 Go ahead and split them too. This matches the logic in
7062 gimple_find_edge_insert_loc. */
7063 else if ((!single_pred_p (e
->dest
)
7064 || !gimple_seq_empty_p (phi_nodes (e
->dest
))
7065 || e
->dest
== EXIT_BLOCK_PTR
)
7066 && e
->src
!= ENTRY_BLOCK_PTR
7067 && !(e
->flags
& EDGE_ABNORMAL
))
7069 gimple_stmt_iterator gsi
;
7071 gsi
= gsi_last_bb (e
->src
);
7072 if (!gsi_end_p (gsi
)
7073 && stmt_ends_bb_p (gsi_stmt (gsi
))
7074 && (gimple_code (gsi_stmt (gsi
)) != GIMPLE_RETURN
7075 && !gimple_call_builtin_p (gsi_stmt (gsi
),
7081 end_recording_case_labels ();
7085 struct gimple_opt_pass pass_split_crit_edges
=
7089 "crited", /* name */
7091 split_critical_edges
, /* execute */
7094 0, /* static_pass_number */
7095 TV_TREE_SPLIT_EDGES
, /* tv_id */
7096 PROP_cfg
, /* properties required */
7097 PROP_no_crit_edges
, /* properties_provided */
7098 0, /* properties_destroyed */
7099 0, /* todo_flags_start */
7100 TODO_dump_func
| TODO_verify_flow
/* todo_flags_finish */
7105 /* Build a ternary operation and gimplify it. Emit code before GSI.
7106 Return the gimple_val holding the result. */
7109 gimplify_build3 (gimple_stmt_iterator
*gsi
, enum tree_code code
,
7110 tree type
, tree a
, tree b
, tree c
)
7113 location_t loc
= gimple_location (gsi_stmt (*gsi
));
7115 ret
= fold_build3_loc (loc
, code
, type
, a
, b
, c
);
7118 return force_gimple_operand_gsi (gsi
, ret
, true, NULL
, true,
7122 /* Build a binary operation and gimplify it. Emit code before GSI.
7123 Return the gimple_val holding the result. */
7126 gimplify_build2 (gimple_stmt_iterator
*gsi
, enum tree_code code
,
7127 tree type
, tree a
, tree b
)
7131 ret
= fold_build2_loc (gimple_location (gsi_stmt (*gsi
)), code
, type
, a
, b
);
7134 return force_gimple_operand_gsi (gsi
, ret
, true, NULL
, true,
7138 /* Build a unary operation and gimplify it. Emit code before GSI.
7139 Return the gimple_val holding the result. */
7142 gimplify_build1 (gimple_stmt_iterator
*gsi
, enum tree_code code
, tree type
,
7147 ret
= fold_build1_loc (gimple_location (gsi_stmt (*gsi
)), code
, type
, a
);
7150 return force_gimple_operand_gsi (gsi
, ret
, true, NULL
, true,
7156 /* Emit return warnings. */
7159 execute_warn_function_return (void)
7161 source_location location
;
7166 /* If we have a path to EXIT, then we do return. */
7167 if (TREE_THIS_VOLATILE (cfun
->decl
)
7168 && EDGE_COUNT (EXIT_BLOCK_PTR
->preds
) > 0)
7170 location
= UNKNOWN_LOCATION
;
7171 FOR_EACH_EDGE (e
, ei
, EXIT_BLOCK_PTR
->preds
)
7173 last
= last_stmt (e
->src
);
7174 if ((gimple_code (last
) == GIMPLE_RETURN
7175 || gimple_call_builtin_p (last
, BUILT_IN_RETURN
))
7176 && (location
= gimple_location (last
)) != UNKNOWN_LOCATION
)
7179 if (location
== UNKNOWN_LOCATION
)
7180 location
= cfun
->function_end_locus
;
7181 warning_at (location
, 0, "%<noreturn%> function does return");
7184 /* If we see "return;" in some basic block, then we do reach the end
7185 without returning a value. */
7186 else if (warn_return_type
7187 && !TREE_NO_WARNING (cfun
->decl
)
7188 && EDGE_COUNT (EXIT_BLOCK_PTR
->preds
) > 0
7189 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (cfun
->decl
))))
7191 FOR_EACH_EDGE (e
, ei
, EXIT_BLOCK_PTR
->preds
)
7193 gimple last
= last_stmt (e
->src
);
7194 if (gimple_code (last
) == GIMPLE_RETURN
7195 && gimple_return_retval (last
) == NULL
7196 && !gimple_no_warning_p (last
))
7198 location
= gimple_location (last
);
7199 if (location
== UNKNOWN_LOCATION
)
7200 location
= cfun
->function_end_locus
;
7201 warning_at (location
, OPT_Wreturn_type
, "control reaches end of non-void function");
7202 TREE_NO_WARNING (cfun
->decl
) = 1;
7211 /* Given a basic block B which ends with a conditional and has
7212 precisely two successors, determine which of the edges is taken if
7213 the conditional is true and which is taken if the conditional is
7214 false. Set TRUE_EDGE and FALSE_EDGE appropriately. */
7217 extract_true_false_edges_from_block (basic_block b
,
7221 edge e
= EDGE_SUCC (b
, 0);
7223 if (e
->flags
& EDGE_TRUE_VALUE
)
7226 *false_edge
= EDGE_SUCC (b
, 1);
7231 *true_edge
= EDGE_SUCC (b
, 1);
7235 struct gimple_opt_pass pass_warn_function_return
=
7239 "*warn_function_return", /* name */
7241 execute_warn_function_return
, /* execute */
7244 0, /* static_pass_number */
7245 TV_NONE
, /* tv_id */
7246 PROP_cfg
, /* properties_required */
7247 0, /* properties_provided */
7248 0, /* properties_destroyed */
7249 0, /* todo_flags_start */
7250 0 /* todo_flags_finish */
7254 /* Emit noreturn warnings. */
7257 execute_warn_function_noreturn (void)
7259 if (warn_missing_noreturn
7260 && !TREE_THIS_VOLATILE (cfun
->decl
)
7261 && EDGE_COUNT (EXIT_BLOCK_PTR
->preds
) == 0
7262 && !lang_hooks
.missing_noreturn_ok_p (cfun
->decl
))
7263 warning_at (DECL_SOURCE_LOCATION (cfun
->decl
), OPT_Wmissing_noreturn
,
7264 "function might be possible candidate "
7265 "for attribute %<noreturn%>");
7269 struct gimple_opt_pass pass_warn_function_noreturn
=
7273 "*warn_function_noreturn", /* name */
7275 execute_warn_function_noreturn
, /* execute */
7278 0, /* static_pass_number */
7279 TV_NONE
, /* tv_id */
7280 PROP_cfg
, /* properties_required */
7281 0, /* properties_provided */
7282 0, /* properties_destroyed */
7283 0, /* todo_flags_start */
7284 0 /* todo_flags_finish */
7289 /* Walk a gimplified function and warn for functions whose return value is
7290 ignored and attribute((warn_unused_result)) is set. This is done before
7291 inlining, so we don't have to worry about that. */
7294 do_warn_unused_result (gimple_seq seq
)
7297 gimple_stmt_iterator i
;
7299 for (i
= gsi_start (seq
); !gsi_end_p (i
); gsi_next (&i
))
7301 gimple g
= gsi_stmt (i
);
7303 switch (gimple_code (g
))
7306 do_warn_unused_result (gimple_bind_body (g
));
7309 do_warn_unused_result (gimple_try_eval (g
));
7310 do_warn_unused_result (gimple_try_cleanup (g
));
7313 do_warn_unused_result (gimple_catch_handler (g
));
7315 case GIMPLE_EH_FILTER
:
7316 do_warn_unused_result (gimple_eh_filter_failure (g
));
7320 if (gimple_call_lhs (g
))
7323 /* This is a naked call, as opposed to a GIMPLE_CALL with an
7324 LHS. All calls whose value is ignored should be
7325 represented like this. Look for the attribute. */
7326 fdecl
= gimple_call_fndecl (g
);
7327 ftype
= TREE_TYPE (TREE_TYPE (gimple_call_fn (g
)));
7329 if (lookup_attribute ("warn_unused_result", TYPE_ATTRIBUTES (ftype
)))
7331 location_t loc
= gimple_location (g
);
7334 warning_at (loc
, OPT_Wunused_result
,
7335 "ignoring return value of %qD, "
7336 "declared with attribute warn_unused_result",
7339 warning_at (loc
, OPT_Wunused_result
,
7340 "ignoring return value of function "
7341 "declared with attribute warn_unused_result");
7346 /* Not a container, not a call, or a call whose value is used. */
7353 run_warn_unused_result (void)
7355 do_warn_unused_result (gimple_body (current_function_decl
));
7360 gate_warn_unused_result (void)
7362 return flag_warn_unused_result
;
7365 struct gimple_opt_pass pass_warn_unused_result
=
7369 "*warn_unused_result", /* name */
7370 gate_warn_unused_result
, /* gate */
7371 run_warn_unused_result
, /* execute */
7374 0, /* static_pass_number */
7375 TV_NONE
, /* tv_id */
7376 PROP_gimple_any
, /* properties_required */
7377 0, /* properties_provided */
7378 0, /* properties_destroyed */
7379 0, /* todo_flags_start */
7380 0, /* todo_flags_finish */