1 /* Data and Control Flow Analysis for Trees. 2 Copyright (C) 2001, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 3 Free Software Foundation, Inc. 4 Contributed by Diego Novillo <dnovillo@redhat.com> 5 6 This file is part of GCC. 7 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) 11 any later version. 12 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. 17 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/>. */ 21 22 #ifndef _TREE_FLOW_H 23 #define _TREE_FLOW_H 1 24 25 #include "bitmap.h" 26 #include "sbitmap.h" 27 #include "basic-block.h" 28 #include "hashtab.h" 29 #include "gimple.h" 30 #include "tree-ssa-operands.h" 31 #include "cgraph.h" 32 #include "ipa-reference.h" 33 #include "tree-ssa-alias.h" 34 35 36 /* This structure is used to map a gimple statement to a label, 37 or list of labels to represent transaction restart. */ 38 39 struct GTY(()) tm_restart_node { 40 gimple stmt; 41 tree label_or_list; 42 }; 43 44 /* Gimple dataflow datastructure. All publicly available fields shall have 45 gimple_ accessor defined in tree-flow-inline.h, all publicly modifiable 46 fields should have gimple_set accessor. */ 47 struct GTY(()) gimple_df { 48 /* Array of all variables referenced in the function. */ 49 htab_t GTY((param_is (union tree_node))) referenced_vars; 50 51 /* A vector of all the noreturn calls passed to modify_stmt. 52 cleanup_control_flow uses it to detect cases where a mid-block 53 indirect call has been turned into a noreturn call. When this 54 happens, all the instructions after the call are no longer 55 reachable and must be deleted as dead. */ 56 VEC(gimple,gc) *modified_noreturn_calls; 57 58 /* Array of all SSA_NAMEs used in the function. */ 59 VEC(tree,gc) *ssa_names; 60 61 /* Artificial variable used for the virtual operand FUD chain. */ 62 tree vop; 63 64 /* The PTA solution for the ESCAPED artificial variable. */ 65 struct pt_solution escaped; 66 67 /* A map of decls to artificial ssa-names that point to the partition 68 of the decl. */ 69 struct pointer_map_t * GTY((skip(""))) decls_to_pointers; 70 71 /* Free list of SSA_NAMEs. */ 72 VEC(tree,gc) *free_ssanames; 73 74 /* Hashtable holding definition for symbol. If this field is not NULL, it 75 means that the first reference to this variable in the function is a 76 USE or a VUSE. In those cases, the SSA renamer creates an SSA name 77 for this variable with an empty defining statement. */ 78 htab_t GTY((param_is (union tree_node))) default_defs; 79 80 /* Symbols whose SSA form needs to be updated or created for the first 81 time. */ 82 bitmap syms_to_rename; 83 84 /* True if the code is in ssa form. */ 85 unsigned int in_ssa_p : 1; 86 87 /* True if IPA points-to information was computed for this function. */ 88 unsigned int ipa_pta : 1; 89 90 struct ssa_operands ssa_operands; 91 92 /* Map gimple stmt to tree label (or list of labels) for transaction 93 restart and abort. */ 94 htab_t GTY ((param_is (struct tm_restart_node))) tm_restart; 95 }; 96 97 /* Accessors for internal use only. Generic code should use abstraction 98 provided by tree-flow-inline.h or specific modules. */ 99 #define FREE_SSANAMES(fun) (fun)->gimple_df->free_ssanames 100 #define SSANAMES(fun) (fun)->gimple_df->ssa_names 101 #define MODIFIED_NORETURN_CALLS(fun) (fun)->gimple_df->modified_noreturn_calls 102 #define DEFAULT_DEFS(fun) (fun)->gimple_df->default_defs 103 #define SYMS_TO_RENAME(fun) (fun)->gimple_df->syms_to_rename 104 105 typedef struct 106 { 107 htab_t htab; 108 PTR *slot; 109 PTR *limit; 110 } htab_iterator; 111 112 /* Iterate through the elements of hashtable HTAB, using htab_iterator ITER, 113 storing each element in RESULT, which is of type TYPE. */ 114 #define FOR_EACH_HTAB_ELEMENT(HTAB, RESULT, TYPE, ITER) \ 115 for (RESULT = (TYPE) first_htab_element (&(ITER), (HTAB)); \ 116 !end_htab_p (&(ITER)); \ 117 RESULT = (TYPE) next_htab_element (&(ITER))) 118 119 /*--------------------------------------------------------------------------- 120 Attributes for SSA_NAMEs. 121 122 NOTE: These structures are stored in struct tree_ssa_name 123 but are only used by the tree optimizers, so it makes better sense 124 to declare them here to avoid recompiling unrelated files when 125 making changes. 126 ---------------------------------------------------------------------------*/ 127 128 /* Aliasing information for SSA_NAMEs representing pointer variables. */ 129 130 struct GTY(()) ptr_info_def 131 { 132 /* The points-to solution. */ 133 struct pt_solution pt; 134 135 /* Alignment and misalignment of the pointer in bytes. Together 136 align and misalign specify low known bits of the pointer. 137 ptr & (align - 1) == misalign. */ 138 139 /* The power-of-two byte alignment of the object this pointer 140 points into. This is usually DECL_ALIGN_UNIT for decls and 141 MALLOC_ABI_ALIGNMENT for allocated storage. */ 142 unsigned int align; 143 144 /* The byte offset this pointer differs from the above alignment. */ 145 unsigned int misalign; 146 }; 147 148 149 /* It is advantageous to avoid things like life analysis for variables which 150 do not need PHI nodes. This enum describes whether or not a particular 151 variable may need a PHI node. */ 152 153 enum need_phi_state { 154 /* This is the default. If we are still in this state after finding 155 all the definition and use sites, then we will assume the variable 156 needs PHI nodes. This is probably an overly conservative assumption. */ 157 NEED_PHI_STATE_UNKNOWN, 158 159 /* This state indicates that we have seen one or more sets of the 160 variable in a single basic block and that the sets dominate all 161 uses seen so far. If after finding all definition and use sites 162 we are still in this state, then the variable does not need any 163 PHI nodes. */ 164 NEED_PHI_STATE_NO, 165 166 /* This state indicates that we have either seen multiple definitions of 167 the variable in multiple blocks, or that we encountered a use in a 168 block that was not dominated by the block containing the set(s) of 169 this variable. This variable is assumed to need PHI nodes. */ 170 NEED_PHI_STATE_MAYBE 171 }; 172 173 174 struct GTY(()) var_ann_d { 175 /* Used when building base variable structures in a var_map. */ 176 unsigned base_var_processed : 1; 177 178 /* Nonzero if this variable was used after SSA optimizations were 179 applied. We set this when translating out of SSA form. */ 180 unsigned used : 1; 181 182 /* This field indicates whether or not the variable may need PHI nodes. 183 See the enum's definition for more detailed information about the 184 states. */ 185 ENUM_BITFIELD (need_phi_state) need_phi_state : 2; 186 187 /* Used by var_map for the base index of ssa base variables. */ 188 unsigned base_index; 189 190 /* During into-ssa and the dominator optimizer, this field holds the 191 current version of this variable (an SSA_NAME). */ 192 tree current_def; 193 }; 194 195 196 /* Immediate use lists are used to directly access all uses for an SSA 197 name and get pointers to the statement for each use. 198 199 The structure ssa_use_operand_d consists of PREV and NEXT pointers 200 to maintain the list. A USE pointer, which points to address where 201 the use is located and a LOC pointer which can point to the 202 statement where the use is located, or, in the case of the root 203 node, it points to the SSA name itself. 204 205 The list is anchored by an occurrence of ssa_operand_d *in* the 206 ssa_name node itself (named 'imm_uses'). This node is uniquely 207 identified by having a NULL USE pointer. and the LOC pointer 208 pointing back to the ssa_name node itself. This node forms the 209 base for a circular list, and initially this is the only node in 210 the list. 211 212 Fast iteration allows each use to be examined, but does not allow 213 any modifications to the uses or stmts. 214 215 Normal iteration allows insertion, deletion, and modification. the 216 iterator manages this by inserting a marker node into the list 217 immediately before the node currently being examined in the list. 218 this marker node is uniquely identified by having null stmt *and* a 219 null use pointer. 220 221 When iterating to the next use, the iteration routines check to see 222 if the node after the marker has changed. if it has, then the node 223 following the marker is now the next one to be visited. if not, the 224 marker node is moved past that node in the list (visualize it as 225 bumping the marker node through the list). this continues until 226 the marker node is moved to the original anchor position. the 227 marker node is then removed from the list. 228 229 If iteration is halted early, the marker node must be removed from 230 the list before continuing. */ 231 typedef struct immediate_use_iterator_d 232 { 233 /* This is the current use the iterator is processing. */ 234 ssa_use_operand_t *imm_use; 235 /* This marks the last use in the list (use node from SSA_NAME) */ 236 ssa_use_operand_t *end_p; 237 /* This node is inserted and used to mark the end of the uses for a stmt. */ 238 ssa_use_operand_t iter_node; 239 /* This is the next ssa_name to visit. IMM_USE may get removed before 240 the next one is traversed to, so it must be cached early. */ 241 ssa_use_operand_t *next_imm_name; 242 } imm_use_iterator; 243 244 245 /* Use this iterator when simply looking at stmts. Adding, deleting or 246 modifying stmts will cause this iterator to malfunction. */ 247 248 #define FOR_EACH_IMM_USE_FAST(DEST, ITER, SSAVAR) \ 249 for ((DEST) = first_readonly_imm_use (&(ITER), (SSAVAR)); \ 250 !end_readonly_imm_use_p (&(ITER)); \ 251 (void) ((DEST) = next_readonly_imm_use (&(ITER)))) 252 253 /* Use this iterator to visit each stmt which has a use of SSAVAR. */ 254 255 #define FOR_EACH_IMM_USE_STMT(STMT, ITER, SSAVAR) \ 256 for ((STMT) = first_imm_use_stmt (&(ITER), (SSAVAR)); \ 257 !end_imm_use_stmt_p (&(ITER)); \ 258 (void) ((STMT) = next_imm_use_stmt (&(ITER)))) 259 260 /* Use this to terminate the FOR_EACH_IMM_USE_STMT loop early. Failure to 261 do so will result in leaving a iterator marker node in the immediate 262 use list, and nothing good will come from that. */ 263 #define BREAK_FROM_IMM_USE_STMT(ITER) \ 264 { \ 265 end_imm_use_stmt_traverse (&(ITER)); \ 266 break; \ 267 } 268 269 270 /* Use this iterator in combination with FOR_EACH_IMM_USE_STMT to 271 get access to each occurrence of ssavar on the stmt returned by 272 that iterator.. for instance: 273 274 FOR_EACH_IMM_USE_STMT (stmt, iter, var) 275 { 276 FOR_EACH_IMM_USE_ON_STMT (use_p, iter) 277 { 278 SET_USE (use_p, blah); 279 } 280 update_stmt (stmt); 281 } */ 282 283 #define FOR_EACH_IMM_USE_ON_STMT(DEST, ITER) \ 284 for ((DEST) = first_imm_use_on_stmt (&(ITER)); \ 285 !end_imm_use_on_stmt_p (&(ITER)); \ 286 (void) ((DEST) = next_imm_use_on_stmt (&(ITER)))) 287 288 289 290 typedef struct var_ann_d *var_ann_t; 291 292 static inline var_ann_t var_ann (const_tree); 293 static inline void update_stmt (gimple); 294 static inline int get_lineno (const_gimple); 295 296 /* Accessors for basic block annotations. */ 297 static inline gimple_seq phi_nodes (const_basic_block); 298 static inline void set_phi_nodes (basic_block, gimple_seq); 299 300 /*--------------------------------------------------------------------------- 301 Global declarations 302 ---------------------------------------------------------------------------*/ 303 struct int_tree_map { 304 unsigned int uid; 305 tree to; 306 }; 307 308 extern unsigned int int_tree_map_hash (const void *); 309 extern int int_tree_map_eq (const void *, const void *); 310 311 extern unsigned int uid_decl_map_hash (const void *); 312 extern int uid_decl_map_eq (const void *, const void *); 313 314 typedef struct 315 { 316 htab_iterator hti; 317 } referenced_var_iterator; 318 319 /* This macro loops over all the referenced vars, one at a time, putting the 320 current var in VAR. Note: You are not allowed to add referenced variables 321 to the hashtable while using this macro. Doing so may cause it to behave 322 erratically. */ 323 324 #define FOR_EACH_REFERENCED_VAR(FN, VAR, ITER) \ 325 for ((VAR) = first_referenced_var ((FN), &(ITER)); \ 326 !end_referenced_vars_p (&(ITER)); \ 327 (VAR) = next_referenced_var (&(ITER))) 328 329 extern tree referenced_var_lookup (struct function *, unsigned int); 330 extern bool referenced_var_check_and_insert (tree); 331 #define num_referenced_vars htab_elements (gimple_referenced_vars (cfun)) 332 333 #define num_ssa_names (VEC_length (tree, cfun->gimple_df->ssa_names)) 334 #define ssa_name(i) (VEC_index (tree, cfun->gimple_df->ssa_names, (i))) 335 336 /* Macros for showing usage statistics. */ 337 #define SCALE(x) ((unsigned long) ((x) < 1024*10 \ 338 ? (x) \ 339 : ((x) < 1024*1024*10 \ 340 ? (x) / 1024 \ 341 : (x) / (1024*1024)))) 342 343 #define LABEL(x) ((x) < 1024*10 ? 'b' : ((x) < 1024*1024*10 ? 'k' : 'M')) 344 345 #define PERCENT(x,y) ((float)(x) * 100.0 / (float)(y)) 346 347 /*--------------------------------------------------------------------------- 348 OpenMP Region Tree 349 ---------------------------------------------------------------------------*/ 350 351 /* Parallel region information. Every parallel and workshare 352 directive is enclosed between two markers, the OMP_* directive 353 and a corresponding OMP_RETURN statement. */ 354 355 struct omp_region 356 { 357 /* The enclosing region. */ 358 struct omp_region *outer; 359 360 /* First child region. */ 361 struct omp_region *inner; 362 363 /* Next peer region. */ 364 struct omp_region *next; 365 366 /* Block containing the omp directive as its last stmt. */ 367 basic_block entry; 368 369 /* Block containing the OMP_RETURN as its last stmt. */ 370 basic_block exit; 371 372 /* Block containing the OMP_CONTINUE as its last stmt. */ 373 basic_block cont; 374 375 /* If this is a combined parallel+workshare region, this is a list 376 of additional arguments needed by the combined parallel+workshare 377 library call. */ 378 VEC(tree,gc) *ws_args; 379 380 /* The code for the omp directive of this region. */ 381 enum gimple_code type; 382 383 /* Schedule kind, only used for OMP_FOR type regions. */ 384 enum omp_clause_schedule_kind sched_kind; 385 386 /* True if this is a combined parallel+workshare region. */ 387 bool is_combined_parallel; 388 }; 389 390 extern struct omp_region *root_omp_region; 391 extern struct omp_region *new_omp_region (basic_block, enum gimple_code, 392 struct omp_region *); 393 extern void free_omp_regions (void); 394 void omp_expand_local (basic_block); 395 extern tree find_omp_clause (tree, enum omp_clause_code); 396 tree copy_var_decl (tree, tree, tree); 397 398 /*--------------------------------------------------------------------------- 399 Function prototypes 400 ---------------------------------------------------------------------------*/ 401 /* In tree-cfg.c */ 402 403 /* Location to track pending stmt for edge insertion. */ 404 #define PENDING_STMT(e) ((e)->insns.g) 405 406 extern void delete_tree_cfg_annotations (void); 407 extern bool stmt_ends_bb_p (gimple); 408 extern bool is_ctrl_stmt (gimple); 409 extern bool is_ctrl_altering_stmt (gimple); 410 extern bool simple_goto_p (gimple); 411 extern bool stmt_can_make_abnormal_goto (gimple); 412 extern basic_block single_noncomplex_succ (basic_block bb); 413 extern void gimple_dump_bb (basic_block, FILE *, int, int); 414 extern void gimple_debug_bb (basic_block); 415 extern basic_block gimple_debug_bb_n (int); 416 extern void gimple_dump_cfg (FILE *, int); 417 extern void gimple_debug_cfg (int); 418 extern void dump_cfg_stats (FILE *); 419 extern void dot_cfg (void); 420 extern void debug_cfg_stats (void); 421 extern void debug_loops (int); 422 extern void debug_loop (struct loop *, int); 423 extern void debug_loop_num (unsigned, int); 424 extern void print_loops (FILE *, int); 425 extern void print_loops_bb (FILE *, basic_block, int, int); 426 extern void cleanup_dead_labels (void); 427 extern void group_case_labels (void); 428 extern gimple first_stmt (basic_block); 429 extern gimple last_stmt (basic_block); 430 extern gimple last_and_only_stmt (basic_block); 431 extern edge find_taken_edge (basic_block, tree); 432 extern basic_block label_to_block_fn (struct function *, tree); 433 #define label_to_block(t) (label_to_block_fn (cfun, t)) 434 extern void notice_special_calls (gimple); 435 extern void clear_special_calls (void); 436 extern void verify_gimple_in_seq (gimple_seq); 437 extern void verify_gimple_in_cfg (struct function *); 438 extern tree gimple_block_label (basic_block); 439 extern void extract_true_false_edges_from_block (basic_block, edge *, edge *); 440 extern bool gimple_duplicate_sese_region (edge, edge, basic_block *, unsigned, 441 basic_block *); 442 extern bool gimple_duplicate_sese_tail (edge, edge, basic_block *, unsigned, 443 basic_block *); 444 extern void gather_blocks_in_sese_region (basic_block entry, basic_block exit, 445 VEC(basic_block,heap) **bbs_p); 446 extern void add_phi_args_after_copy_bb (basic_block); 447 extern void add_phi_args_after_copy (basic_block *, unsigned, edge); 448 extern bool gimple_purge_dead_eh_edges (basic_block); 449 extern bool gimple_purge_all_dead_eh_edges (const_bitmap); 450 extern bool gimple_purge_dead_abnormal_call_edges (basic_block); 451 extern bool gimple_purge_all_dead_abnormal_call_edges (const_bitmap); 452 extern tree gimplify_build1 (gimple_stmt_iterator *, enum tree_code, 453 tree, tree); 454 extern tree gimplify_build2 (gimple_stmt_iterator *, enum tree_code, 455 tree, tree, tree); 456 extern tree gimplify_build3 (gimple_stmt_iterator *, enum tree_code, 457 tree, tree, tree, tree); 458 extern void init_empty_tree_cfg (void); 459 extern void init_empty_tree_cfg_for_function (struct function *); 460 extern void fold_cond_expr_cond (void); 461 extern void make_abnormal_goto_edges (basic_block, bool); 462 extern void replace_uses_by (tree, tree); 463 extern void start_recording_case_labels (void); 464 extern void end_recording_case_labels (void); 465 extern basic_block move_sese_region_to_fn (struct function *, basic_block, 466 basic_block, tree); 467 void remove_edge_and_dominated_blocks (edge); 468 bool tree_node_can_be_shared (tree); 469 470 /* In tree-cfgcleanup.c */ 471 extern bitmap cfgcleanup_altered_bbs; 472 extern bool cleanup_tree_cfg (void); 473 474 /* In tree-pretty-print.c. */ 475 extern void dump_generic_bb (FILE *, basic_block, int, int); 476 extern int op_code_prio (enum tree_code); 477 extern int op_prio (const_tree); 478 extern const char *op_symbol_code (enum tree_code); 479 480 /* In tree-dfa.c */ 481 extern var_ann_t create_var_ann (tree); 482 extern void renumber_gimple_stmt_uids (void); 483 extern void renumber_gimple_stmt_uids_in_blocks (basic_block *, int); 484 extern void dump_dfa_stats (FILE *); 485 extern void debug_dfa_stats (void); 486 extern void debug_referenced_vars (void); 487 extern void dump_referenced_vars (FILE *); 488 extern void dump_variable (FILE *, tree); 489 extern void debug_variable (tree); 490 extern tree get_virtual_var (tree); 491 extern bool add_referenced_var (tree); 492 extern void remove_referenced_var (tree); 493 extern void mark_symbols_for_renaming (gimple); 494 extern void find_new_referenced_vars (gimple); 495 extern tree make_rename_temp (tree, const char *); 496 extern void set_default_def (tree, tree); 497 extern tree gimple_default_def (struct function *, tree); 498 extern bool stmt_references_abnormal_ssa_name (gimple); 499 extern tree get_ref_base_and_extent (tree, HOST_WIDE_INT *, 500 HOST_WIDE_INT *, HOST_WIDE_INT *); 501 extern tree get_addr_base_and_unit_offset (tree, HOST_WIDE_INT *); 502 extern void find_referenced_vars_in (gimple); 503 504 /* In tree-phinodes.c */ 505 extern void reserve_phi_args_for_new_edge (basic_block); 506 extern void add_phi_node_to_bb (gimple phi, basic_block bb); 507 extern gimple create_phi_node (tree, basic_block); 508 extern void add_phi_arg (gimple, tree, edge, source_location); 509 extern void remove_phi_args (edge); 510 extern void remove_phi_node (gimple_stmt_iterator *, bool); 511 extern void remove_phi_nodes (basic_block); 512 extern void init_phinodes (void); 513 extern void fini_phinodes (void); 514 extern void release_phi_node (gimple); 515 #ifdef GATHER_STATISTICS 516 extern void phinodes_print_statistics (void); 517 #endif 518 519 /* In gimple-low.c */ 520 extern void record_vars_into (tree, tree); 521 extern void record_vars (tree); 522 extern bool gimple_seq_may_fallthru (gimple_seq); 523 extern bool gimple_stmt_may_fallthru (gimple); 524 extern bool gimple_check_call_matching_types (gimple, tree); 525 526 527 /* In tree-ssa.c */ 528 529 /* Mapping for redirected edges. */ 530 struct _edge_var_map { 531 tree result; /* PHI result. */ 532 tree def; /* PHI arg definition. */ 533 source_location locus; /* PHI arg location. */ 534 }; 535 typedef struct _edge_var_map edge_var_map; 536 537 DEF_VEC_O(edge_var_map); 538 DEF_VEC_ALLOC_O(edge_var_map, heap); 539 540 /* A vector of var maps. */ 541 typedef VEC(edge_var_map, heap) *edge_var_map_vector; 542 543 extern void init_tree_ssa (struct function *); 544 extern void redirect_edge_var_map_add (edge, tree, tree, source_location); 545 extern void redirect_edge_var_map_clear (edge); 546 extern void redirect_edge_var_map_dup (edge, edge); 547 extern edge_var_map_vector redirect_edge_var_map_vector (edge); 548 extern void redirect_edge_var_map_destroy (void); 549 550 extern edge ssa_redirect_edge (edge, basic_block); 551 extern void flush_pending_stmts (edge); 552 extern void verify_ssa (bool); 553 extern void delete_tree_ssa (void); 554 extern bool ssa_undefined_value_p (tree); 555 extern void warn_uninit (enum opt_code, tree, tree, tree, const char *, void *); 556 extern unsigned int warn_uninitialized_vars (bool); 557 extern void execute_update_addresses_taken (void); 558 559 /* Call-back function for walk_use_def_chains(). At each reaching 560 definition, a function with this prototype is called. */ 561 typedef bool (*walk_use_def_chains_fn) (tree, gimple, void *); 562 563 extern void walk_use_def_chains (tree, walk_use_def_chains_fn, void *, bool); 564 565 void insert_debug_temps_for_defs (gimple_stmt_iterator *); 566 void insert_debug_temp_for_var_def (gimple_stmt_iterator *, tree); 567 void reset_debug_uses (gimple); 568 void release_defs_bitset (bitmap toremove); 569 570 /* In tree-into-ssa.c */ 571 void update_ssa (unsigned); 572 void delete_update_ssa (void); 573 void register_new_name_mapping (tree, tree); 574 tree create_new_def_for (tree, gimple, def_operand_p); 575 bool need_ssa_update_p (struct function *); 576 bool name_mappings_registered_p (void); 577 bool name_registered_for_update_p (tree); 578 bitmap ssa_names_to_replace (void); 579 void release_ssa_name_after_update_ssa (tree); 580 void compute_global_livein (bitmap, bitmap); 581 void mark_sym_for_renaming (tree); 582 void mark_set_for_renaming (bitmap); 583 bool symbol_marked_for_renaming (tree); 584 tree get_current_def (tree); 585 void set_current_def (tree, tree); 586 587 /* In tree-ssanames.c */ 588 extern void init_ssanames (struct function *, int); 589 extern void fini_ssanames (void); 590 extern tree make_ssa_name_fn (struct function *, tree, gimple); 591 extern tree duplicate_ssa_name (tree, gimple); 592 extern void duplicate_ssa_name_ptr_info (tree, struct ptr_info_def *); 593 extern void release_ssa_name (tree); 594 extern void release_defs (gimple); 595 extern void replace_ssa_name_symbol (tree, tree); 596 597 #ifdef GATHER_STATISTICS 598 extern void ssanames_print_statistics (void); 599 #endif 600 601 /* In tree-ssa-ccp.c */ 602 tree fold_const_aggregate_ref (tree); 603 tree gimple_fold_stmt_to_constant (gimple, tree (*)(tree)); 604 605 /* In tree-ssa-dom.c */ 606 extern void dump_dominator_optimization_stats (FILE *); 607 extern void debug_dominator_optimization_stats (void); 608 int loop_depth_of_name (tree); 609 tree degenerate_phi_result (gimple); 610 bool simple_iv_increment_p (gimple); 611 612 /* In tree-ssa-copy.c */ 613 extern void propagate_value (use_operand_p, tree); 614 extern void propagate_tree_value (tree *, tree); 615 extern void propagate_tree_value_into_stmt (gimple_stmt_iterator *, tree); 616 extern void replace_exp (use_operand_p, tree); 617 extern bool may_propagate_copy (tree, tree); 618 extern bool may_propagate_copy_into_stmt (gimple, tree); 619 extern bool may_propagate_copy_into_asm (tree); 620 621 /* In tree-ssa-loop-ch.c */ 622 bool do_while_loop_p (struct loop *); 623 624 /* Affine iv. */ 625 626 typedef struct 627 { 628 /* Iv = BASE + STEP * i. */ 629 tree base, step; 630 631 /* True if this iv does not overflow. */ 632 bool no_overflow; 633 } affine_iv; 634 635 /* Description of number of iterations of a loop. All the expressions inside 636 the structure can be evaluated at the end of the loop's preheader 637 (and due to ssa form, also anywhere inside the body of the loop). */ 638 639 struct tree_niter_desc 640 { 641 tree assumptions; /* The boolean expression. If this expression evaluates 642 to false, then the other fields in this structure 643 should not be used; there is no guarantee that they 644 will be correct. */ 645 tree may_be_zero; /* The boolean expression. If it evaluates to true, 646 the loop will exit in the first iteration (i.e. 647 its latch will not be executed), even if the niter 648 field says otherwise. */ 649 tree niter; /* The expression giving the number of iterations of 650 a loop (provided that assumptions == true and 651 may_be_zero == false), more precisely the number 652 of executions of the latch of the loop. */ 653 double_int max; /* The upper bound on the number of iterations of 654 the loop. */ 655 656 /* The simplified shape of the exit condition. The loop exits if 657 CONTROL CMP BOUND is false, where CMP is one of NE_EXPR, 658 LT_EXPR, or GT_EXPR, and step of CONTROL is positive if CMP is 659 LE_EXPR and negative if CMP is GE_EXPR. This information is used 660 by loop unrolling. */ 661 affine_iv control; 662 tree bound; 663 enum tree_code cmp; 664 }; 665 666 /* In tree-ssa-phiopt.c */ 667 bool empty_block_p (basic_block); 668 basic_block *blocks_in_phiopt_order (void); 669 670 /* In tree-ssa-loop*.c */ 671 672 unsigned int tree_ssa_lim (void); 673 unsigned int tree_ssa_unswitch_loops (void); 674 unsigned int canonicalize_induction_variables (void); 675 unsigned int tree_unroll_loops_completely (bool, bool); 676 unsigned int tree_ssa_prefetch_arrays (void); 677 void tree_ssa_iv_optimize (void); 678 unsigned tree_predictive_commoning (void); 679 tree canonicalize_loop_ivs (struct loop *, tree *, bool); 680 bool parallelize_loops (void); 681 682 bool loop_only_exit_p (const struct loop *, const_edge); 683 bool number_of_iterations_exit (struct loop *, edge, 684 struct tree_niter_desc *niter, bool); 685 tree find_loop_niter (struct loop *, edge *); 686 tree loop_niter_by_eval (struct loop *, edge); 687 tree find_loop_niter_by_eval (struct loop *, edge *); 688 void estimate_numbers_of_iterations (bool); 689 bool array_at_struct_end_p (tree); 690 bool scev_probably_wraps_p (tree, tree, gimple, struct loop *, bool); 691 bool convert_affine_scev (struct loop *, tree, tree *, tree *, gimple, bool); 692 693 bool nowrap_type_p (tree); 694 enum ev_direction {EV_DIR_GROWS, EV_DIR_DECREASES, EV_DIR_UNKNOWN}; 695 enum ev_direction scev_direction (const_tree); 696 697 void free_numbers_of_iterations_estimates (void); 698 void free_numbers_of_iterations_estimates_loop (struct loop *); 699 void rewrite_into_loop_closed_ssa (bitmap, unsigned); 700 void verify_loop_closed_ssa (bool); 701 bool for_each_index (tree *, bool (*) (tree, tree *, void *), void *); 702 void create_iv (tree, tree, tree, struct loop *, gimple_stmt_iterator *, bool, 703 tree *, tree *); 704 basic_block split_loop_exit_edge (edge); 705 void standard_iv_increment_position (struct loop *, gimple_stmt_iterator *, 706 bool *); 707 basic_block ip_end_pos (struct loop *); 708 basic_block ip_normal_pos (struct loop *); 709 bool gimple_duplicate_loop_to_header_edge (struct loop *, edge, 710 unsigned int, sbitmap, 711 edge, VEC (edge, heap) **, 712 int); 713 struct loop *slpeel_tree_duplicate_loop_to_edge_cfg (struct loop *, edge); 714 void rename_variables_in_loop (struct loop *); 715 void rename_variables_in_bb (basic_block bb); 716 tree expand_simple_operations (tree); 717 void substitute_in_loop_info (struct loop *, tree, tree); 718 edge single_dom_exit (struct loop *); 719 bool can_unroll_loop_p (struct loop *loop, unsigned factor, 720 struct tree_niter_desc *niter); 721 void tree_unroll_loop (struct loop *, unsigned, 722 edge, struct tree_niter_desc *); 723 typedef void (*transform_callback)(struct loop *, void *); 724 void tree_transform_and_unroll_loop (struct loop *, unsigned, 725 edge, struct tree_niter_desc *, 726 transform_callback, void *); 727 bool contains_abnormal_ssa_name_p (tree); 728 bool stmt_dominates_stmt_p (gimple, gimple); 729 void mark_virtual_ops_for_renaming (gimple); 730 731 /* In tree-ssa-dce.c */ 732 void mark_virtual_operand_for_renaming (tree); 733 void mark_virtual_phi_result_for_renaming (gimple); 734 735 /* In tree-ssa-threadedge.c */ 736 extern void threadedge_initialize_values (void); 737 extern void threadedge_finalize_values (void); 738 extern VEC(tree,heap) *ssa_name_values; 739 #define SSA_NAME_VALUE(x) \ 740 (SSA_NAME_VERSION(x) < VEC_length(tree, ssa_name_values) \ 741 ? VEC_index(tree, ssa_name_values, SSA_NAME_VERSION(x)) \ 742 : NULL_TREE) 743 extern void set_ssa_name_value (tree, tree); 744 extern bool potentially_threadable_block (basic_block); 745 extern void thread_across_edge (gimple, edge, bool, 746 VEC(tree, heap) **, tree (*) (gimple, gimple)); 747 748 /* In tree-ssa-loop-im.c */ 749 /* The possibilities of statement movement. */ 750 751 enum move_pos 752 { 753 MOVE_IMPOSSIBLE, /* No movement -- side effect expression. */ 754 MOVE_PRESERVE_EXECUTION, /* Must not cause the non-executed statement 755 become executed -- memory accesses, ... */ 756 MOVE_POSSIBLE /* Unlimited movement. */ 757 }; 758 extern enum move_pos movement_possibility (gimple); 759 char *get_lsm_tmp_name (tree, unsigned); 760 761 /* In tree-flow-inline.h */ 762 static inline void set_is_used (tree); 763 static inline bool unmodifiable_var_p (const_tree); 764 static inline bool ref_contains_array_ref (const_tree); 765 766 /* In tree-eh.c */ 767 extern void make_eh_edges (gimple); 768 extern bool make_eh_dispatch_edges (gimple); 769 extern edge redirect_eh_edge (edge, basic_block); 770 extern void redirect_eh_dispatch_edge (gimple, edge, basic_block); 771 extern bool tree_could_trap_p (tree); 772 extern bool operation_could_trap_helper_p (enum tree_code, bool, bool, bool, 773 bool, tree, bool *); 774 extern bool operation_could_trap_p (enum tree_code, bool, bool, tree); 775 extern bool stmt_could_throw_p (gimple); 776 extern bool tree_could_throw_p (tree); 777 extern bool stmt_can_throw_internal (gimple); 778 extern bool stmt_can_throw_external (gimple); 779 extern void add_stmt_to_eh_lp_fn (struct function *, gimple, int); 780 extern void add_stmt_to_eh_lp (gimple, int); 781 extern bool remove_stmt_from_eh_lp (gimple); 782 extern bool remove_stmt_from_eh_lp_fn (struct function *, gimple); 783 extern int lookup_stmt_eh_lp_fn (struct function *, gimple); 784 extern int lookup_stmt_eh_lp (gimple); 785 extern bool maybe_clean_eh_stmt_fn (struct function *, gimple); 786 extern bool maybe_clean_eh_stmt (gimple); 787 extern bool maybe_clean_or_replace_eh_stmt (gimple, gimple); 788 extern bool maybe_duplicate_eh_stmt_fn (struct function *, gimple, 789 struct function *, gimple, 790 struct pointer_map_t *, int); 791 extern bool maybe_duplicate_eh_stmt (gimple, gimple); 792 extern bool verify_eh_edges (gimple); 793 extern bool verify_eh_dispatch_edge (gimple); 794 extern void maybe_remove_unreachable_handlers (void); 795 796 /* In tree-ssa-pre.c */ 797 struct pre_expr_d; 798 void add_to_value (unsigned int, struct pre_expr_d *); 799 void debug_value_expressions (unsigned int); 800 void print_value_expressions (FILE *, unsigned int); 801 802 /* In tree-ssa-sink.c */ 803 bool is_hidden_global_store (gimple); 804 805 /* In tree-loop-linear.c */ 806 extern void linear_transform_loops (void); 807 extern unsigned perfect_loop_nest_depth (struct loop *); 808 809 /* In graphite.c */ 810 extern void graphite_transform_loops (void); 811 812 /* In tree-data-ref.c */ 813 extern void tree_check_data_deps (void); 814 815 /* In tree-ssa-loop-ivopts.c */ 816 bool expr_invariant_in_loop_p (struct loop *, tree); 817 bool stmt_invariant_in_loop_p (struct loop *, gimple); 818 bool multiplier_allowed_in_address_p (HOST_WIDE_INT, enum machine_mode, 819 addr_space_t); 820 unsigned multiply_by_cost (HOST_WIDE_INT, enum machine_mode, bool); 821 bool may_be_nonaddressable_p (tree expr); 822 823 /* In tree-ssa-threadupdate.c. */ 824 extern bool thread_through_all_blocks (bool); 825 extern void register_jump_thread (edge, edge, edge); 826 827 /* In gimplify.c */ 828 tree force_gimple_operand_1 (tree, gimple_seq *, gimple_predicate, tree); 829 tree force_gimple_operand (tree, gimple_seq *, bool, tree); 830 tree force_gimple_operand_gsi_1 (gimple_stmt_iterator *, tree, 831 gimple_predicate, tree, 832 bool, enum gsi_iterator_update); 833 tree force_gimple_operand_gsi (gimple_stmt_iterator *, tree, bool, tree, 834 bool, enum gsi_iterator_update); 835 tree gimple_fold_indirect_ref (tree); 836 837 /* In tree-ssa-live.c */ 838 extern void remove_unused_locals (void); 839 extern void dump_scope_blocks (FILE *, int); 840 extern void debug_scope_blocks (int); 841 extern void debug_scope_block (tree, int); 842 843 /* In tree-ssa-address.c */ 844 845 /* Description of a memory address. */ 846 847 struct mem_address 848 { 849 tree symbol, base, index, step, offset; 850 }; 851 852 struct affine_tree_combination; 853 tree create_mem_ref (gimple_stmt_iterator *, tree, 854 struct affine_tree_combination *, tree, tree, tree, bool); 855 rtx addr_for_mem_ref (struct mem_address *, addr_space_t, bool); 856 void get_address_description (tree, struct mem_address *); 857 tree maybe_fold_tmr (tree); 858 859 unsigned int execute_free_datastructures (void); 860 unsigned int execute_fixup_cfg (void); 861 bool fixup_noreturn_call (gimple stmt); 862 863 /* In ipa-pure-const.c */ 864 void warn_function_noreturn (tree); 865 866 /* In tree-ssa-ter.c */ 867 bool stmt_is_replaceable_p (gimple); 868 869 #include "tree-flow-inline.h" 870 871 void swap_tree_operands (gimple, tree *, tree *); 872 873 #endif /* _TREE_FLOW_H */ 874