Mercurial > hg > CbC > CbC_gcc
annotate gcc/basic-block.h @ 125:2c7bdd5a49f6
supress return with no value, in function returning non-void warning on goto code segment in normal function
| author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
|---|---|
| date | Sun, 01 Apr 2018 14:05:45 +0900 |
| parents | 04ced10e8804 |
| children | 84e7813d76e9 |
| rev | line source |
|---|---|
|
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1 /* Define control flow data structures for the CFG. |
| 111 | 2 Copyright (C) 1987-2017 Free Software Foundation, Inc. |
| 0 | 3 |
| 4 This file is part of GCC. | |
| 5 | |
| 6 GCC is free software; you can redistribute it and/or modify it under | |
| 7 the terms of the GNU General Public License as published by the Free | |
| 8 Software Foundation; either version 3, or (at your option) any later | |
| 9 version. | |
| 10 | |
| 11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
| 12 WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 for more details. | |
| 15 | |
| 16 You should have received a copy of the GNU General Public License | |
| 17 along with GCC; see the file COPYING3. If not see | |
| 18 <http://www.gnu.org/licenses/>. */ | |
| 19 | |
| 20 #ifndef GCC_BASIC_BLOCK_H | |
| 21 #define GCC_BASIC_BLOCK_H | |
| 22 | |
| 111 | 23 #include <profile-count.h> |
| 0 | 24 |
| 25 /* Control flow edge information. */ | |
| 111 | 26 struct GTY((user)) edge_def { |
| 0 | 27 /* The two blocks at the ends of the edge. */ |
| 111 | 28 basic_block src; |
| 29 basic_block dest; | |
| 0 | 30 |
| 31 /* Instructions queued on the edge. */ | |
| 32 union edge_def_insns { | |
| 111 | 33 gimple_seq g; |
| 34 rtx_insn *r; | |
| 35 } insns; | |
| 0 | 36 |
| 37 /* Auxiliary info specific to a pass. */ | |
| 111 | 38 PTR aux; |
| 0 | 39 |
| 111 | 40 /* Location of any goto implicit in the edge. */ |
| 0 | 41 location_t goto_locus; |
| 42 | |
| 43 /* The index number corresponding to this edge in the edge vector | |
| 44 dest->preds. */ | |
| 45 unsigned int dest_idx; | |
| 46 | |
| 111 | 47 int flags; /* see cfg-flags.def */ |
| 48 profile_probability probability; | |
| 49 | |
| 50 /* Return count of edge E. */ | |
| 51 inline profile_count count () const; | |
| 0 | 52 }; |
| 53 | |
| 111 | 54 /* Masks for edge.flags. */ |
| 55 #define DEF_EDGE_FLAG(NAME,IDX) EDGE_##NAME = 1 << IDX , | |
| 56 enum cfg_edge_flags { | |
| 57 #include "cfg-flags.def" | |
| 58 LAST_CFG_EDGE_FLAG /* this is only used for EDGE_ALL_FLAGS */ | |
| 59 }; | |
| 60 #undef DEF_EDGE_FLAG | |
| 61 | |
| 62 /* Bit mask for all edge flags. */ | |
| 63 #define EDGE_ALL_FLAGS ((LAST_CFG_EDGE_FLAG - 1) * 2 - 1) | |
| 64 | |
| 65 /* The following four flags all indicate something special about an edge. | |
| 66 Test the edge flags on EDGE_COMPLEX to detect all forms of "strange" | |
| 67 control flow transfers. */ | |
| 68 #define EDGE_COMPLEX \ | |
| 69 (EDGE_ABNORMAL | EDGE_ABNORMAL_CALL | EDGE_EH | EDGE_PRESERVE) | |
| 0 | 70 |
| 111 | 71 struct GTY(()) rtl_bb_info { |
| 72 /* The first insn of the block is embedded into bb->il.x. */ | |
| 73 /* The last insn of the block. */ | |
| 74 rtx_insn *end_; | |
| 0 | 75 |
| 111 | 76 /* In CFGlayout mode points to insn notes/jumptables to be placed just before |
| 77 and after the block. */ | |
| 78 rtx_insn *header_; | |
| 79 rtx_insn *footer_; | |
| 80 }; | |
| 0 | 81 |
| 111 | 82 struct GTY(()) gimple_bb_info { |
| 83 /* Sequence of statements in this block. */ | |
| 84 gimple_seq seq; | |
| 0 | 85 |
| 111 | 86 /* PHI nodes for this block. */ |
| 87 gimple_seq phi_nodes; | |
| 88 }; | |
| 0 | 89 |
| 111 | 90 /* A basic block is a sequence of instructions with only one entry and |
| 0 | 91 only one exit. If any one of the instructions are executed, they |
| 92 will all be executed, and in sequence from first to last. | |
| 93 | |
| 94 There may be COND_EXEC instructions in the basic block. The | |
| 95 COND_EXEC *instructions* will be executed -- but if the condition | |
| 96 is false the conditionally executed *expressions* will of course | |
| 97 not be executed. We don't consider the conditionally executed | |
| 98 expression (which might have side-effects) to be in a separate | |
| 99 basic block because the program counter will always be at the same | |
| 100 location after the COND_EXEC instruction, regardless of whether the | |
| 101 condition is true or not. | |
| 102 | |
| 103 Basic blocks need not start with a label nor end with a jump insn. | |
| 104 For example, a previous basic block may just "conditionally fall" | |
| 105 into the succeeding basic block, and the last basic block need not | |
| 106 end with a jump insn. Block 0 is a descendant of the entry block. | |
| 107 | |
| 108 A basic block beginning with two labels cannot have notes between | |
| 109 the labels. | |
| 110 | |
| 111 Data for jump tables are stored in jump_insns that occur in no | |
| 112 basic block even though these insns can follow or precede insns in | |
| 113 basic blocks. */ | |
| 114 | |
| 115 /* Basic block information indexed by block number. */ | |
|
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116 struct GTY((chain_next ("%h.next_bb"), chain_prev ("%h.prev_bb"))) basic_block_def { |
| 0 | 117 /* The edges into and out of the block. */ |
| 111 | 118 vec<edge, va_gc> *preds; |
| 119 vec<edge, va_gc> *succs; | |
| 0 | 120 |
| 121 /* Auxiliary info specific to a pass. */ | |
| 122 PTR GTY ((skip (""))) aux; | |
| 123 | |
| 124 /* Innermost loop containing the block. */ | |
| 125 struct loop *loop_father; | |
| 126 | |
| 127 /* The dominance and postdominance information node. */ | |
| 128 struct et_node * GTY ((skip (""))) dom[2]; | |
| 129 | |
| 130 /* Previous and next blocks in the chain. */ | |
| 111 | 131 basic_block prev_bb; |
| 132 basic_block next_bb; | |
| 0 | 133 |
| 134 union basic_block_il_dependent { | |
| 111 | 135 struct gimple_bb_info GTY ((tag ("0"))) gimple; |
| 136 struct { | |
| 137 rtx_insn *head_; | |
| 138 struct rtl_bb_info * rtl; | |
| 139 } GTY ((tag ("1"))) x; | |
| 0 | 140 } GTY ((desc ("((%1.flags & BB_RTL) != 0)"))) il; |
| 141 | |
| 111 | 142 /* Various flags. See cfg-flags.def. */ |
| 143 int flags; | |
| 0 | 144 |
| 145 /* The index of this block. */ | |
| 146 int index; | |
| 147 | |
| 111 | 148 /* Expected number of executions: calculated in profile.c. */ |
| 149 profile_count count; | |
| 0 | 150 |
| 151 /* Expected frequency. Normalized to be in range 0 to BB_FREQ_MAX. */ | |
| 152 int frequency; | |
| 153 | |
| 111 | 154 /* The discriminator for this block. The discriminator distinguishes |
| 155 among several basic blocks that share a common locus, allowing for | |
| 156 more accurate sample-based profiling. */ | |
|
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157 int discriminator; |
| 0 | 158 }; |
| 159 | |
| 111 | 160 /* This ensures that struct gimple_bb_info is smaller than |
| 161 struct rtl_bb_info, so that inlining the former into basic_block_def | |
| 162 is the better choice. */ | |
| 163 typedef int __assert_gimple_bb_smaller_rtl_bb | |
| 164 [(int) sizeof (struct rtl_bb_info) | |
| 165 - (int) sizeof (struct gimple_bb_info)]; | |
| 0 | 166 |
| 167 | |
| 168 #define BB_FREQ_MAX 10000 | |
| 169 | |
| 111 | 170 /* Masks for basic_block.flags. */ |
| 171 #define DEF_BASIC_BLOCK_FLAG(NAME,IDX) BB_##NAME = 1 << IDX , | |
| 172 enum cfg_bb_flags | |
| 0 | 173 { |
| 111 | 174 #include "cfg-flags.def" |
| 175 LAST_CFG_BB_FLAG /* this is only used for BB_ALL_FLAGS */ | |
| 176 }; | |
| 177 #undef DEF_BASIC_BLOCK_FLAG | |
| 0 | 178 |
| 111 | 179 /* Bit mask for all basic block flags. */ |
| 180 #define BB_ALL_FLAGS ((LAST_CFG_BB_FLAG - 1) * 2 - 1) | |
| 0 | 181 |
| 111 | 182 /* Bit mask for all basic block flags that must be preserved. These are |
| 183 the bit masks that are *not* cleared by clear_bb_flags. */ | |
| 184 #define BB_FLAGS_TO_PRESERVE \ | |
| 185 (BB_DISABLE_SCHEDULE | BB_RTL | BB_NON_LOCAL_GOTO_TARGET \ | |
| 186 | BB_HOT_PARTITION | BB_COLD_PARTITION) | |
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parents:
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187 |
| 111 | 188 /* Dummy bitmask for convenience in the hot/cold partitioning code. */ |
| 0 | 189 #define BB_UNPARTITIONED 0 |
| 190 | |
| 191 /* Partitions, to be used when partitioning hot and cold basic blocks into | |
| 192 separate sections. */ | |
| 193 #define BB_PARTITION(bb) ((bb)->flags & (BB_HOT_PARTITION|BB_COLD_PARTITION)) | |
| 194 #define BB_SET_PARTITION(bb, part) do { \ | |
| 195 basic_block bb_ = (bb); \ | |
| 196 bb_->flags = ((bb_->flags & ~(BB_HOT_PARTITION|BB_COLD_PARTITION)) \ | |
| 197 | (part)); \ | |
| 198 } while (0) | |
| 199 | |
| 200 #define BB_COPY_PARTITION(dstbb, srcbb) \ | |
| 201 BB_SET_PARTITION (dstbb, BB_PARTITION (srcbb)) | |
| 202 | |
| 111 | 203 /* Defines for accessing the fields of the CFG structure for function FN. */ |
| 204 #define ENTRY_BLOCK_PTR_FOR_FN(FN) ((FN)->cfg->x_entry_block_ptr) | |
| 205 #define EXIT_BLOCK_PTR_FOR_FN(FN) ((FN)->cfg->x_exit_block_ptr) | |
| 206 #define basic_block_info_for_fn(FN) ((FN)->cfg->x_basic_block_info) | |
| 207 #define n_basic_blocks_for_fn(FN) ((FN)->cfg->x_n_basic_blocks) | |
| 208 #define n_edges_for_fn(FN) ((FN)->cfg->x_n_edges) | |
| 209 #define last_basic_block_for_fn(FN) ((FN)->cfg->x_last_basic_block) | |
| 210 #define label_to_block_map_for_fn(FN) ((FN)->cfg->x_label_to_block_map) | |
| 211 #define profile_status_for_fn(FN) ((FN)->cfg->x_profile_status) | |
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212 |
| 111 | 213 #define BASIC_BLOCK_FOR_FN(FN,N) \ |
| 214 ((*basic_block_info_for_fn (FN))[(N)]) | |
| 215 #define SET_BASIC_BLOCK_FOR_FN(FN,N,BB) \ | |
| 216 ((*basic_block_info_for_fn (FN))[(N)] = (BB)) | |
| 0 | 217 |
| 218 /* For iterating over basic blocks. */ | |
| 219 #define FOR_BB_BETWEEN(BB, FROM, TO, DIR) \ | |
| 220 for (BB = FROM; BB != TO; BB = BB->DIR) | |
| 221 | |
| 222 #define FOR_EACH_BB_FN(BB, FN) \ | |
| 223 FOR_BB_BETWEEN (BB, (FN)->cfg->x_entry_block_ptr->next_bb, (FN)->cfg->x_exit_block_ptr, next_bb) | |
| 224 | |
| 225 #define FOR_EACH_BB_REVERSE_FN(BB, FN) \ | |
| 226 FOR_BB_BETWEEN (BB, (FN)->cfg->x_exit_block_ptr->prev_bb, (FN)->cfg->x_entry_block_ptr, prev_bb) | |
| 227 | |
| 228 /* For iterating over insns in basic block. */ | |
| 229 #define FOR_BB_INSNS(BB, INSN) \ | |
| 230 for ((INSN) = BB_HEAD (BB); \ | |
| 231 (INSN) && (INSN) != NEXT_INSN (BB_END (BB)); \ | |
| 232 (INSN) = NEXT_INSN (INSN)) | |
| 233 | |
| 234 /* For iterating over insns in basic block when we might remove the | |
| 235 current insn. */ | |
| 236 #define FOR_BB_INSNS_SAFE(BB, INSN, CURR) \ | |
| 237 for ((INSN) = BB_HEAD (BB), (CURR) = (INSN) ? NEXT_INSN ((INSN)): NULL; \ | |
| 238 (INSN) && (INSN) != NEXT_INSN (BB_END (BB)); \ | |
| 239 (INSN) = (CURR), (CURR) = (INSN) ? NEXT_INSN ((INSN)) : NULL) | |
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240 |
| 0 | 241 #define FOR_BB_INSNS_REVERSE(BB, INSN) \ |
| 242 for ((INSN) = BB_END (BB); \ | |
| 243 (INSN) && (INSN) != PREV_INSN (BB_HEAD (BB)); \ | |
| 244 (INSN) = PREV_INSN (INSN)) | |
| 245 | |
| 246 #define FOR_BB_INSNS_REVERSE_SAFE(BB, INSN, CURR) \ | |
| 247 for ((INSN) = BB_END (BB),(CURR) = (INSN) ? PREV_INSN ((INSN)) : NULL; \ | |
| 248 (INSN) && (INSN) != PREV_INSN (BB_HEAD (BB)); \ | |
| 249 (INSN) = (CURR), (CURR) = (INSN) ? PREV_INSN ((INSN)) : NULL) | |
| 250 | |
| 251 /* Cycles through _all_ basic blocks, even the fake ones (entry and | |
| 252 exit block). */ | |
| 253 | |
| 254 #define FOR_ALL_BB_FN(BB, FN) \ | |
| 111 | 255 for (BB = ENTRY_BLOCK_PTR_FOR_FN (FN); BB; BB = BB->next_bb) |
| 0 | 256 |
| 257 | |
| 258 /* Stuff for recording basic block info. */ | |
| 259 | |
| 111 | 260 /* For now, these will be functions (so that they can include checked casts |
| 261 to rtx_insn. Once the underlying fields are converted from rtx | |
| 262 to rtx_insn, these can be converted back to macros. */ | |
| 263 | |
| 264 #define BB_HEAD(B) (B)->il.x.head_ | |
| 265 #define BB_END(B) (B)->il.x.rtl->end_ | |
| 266 #define BB_HEADER(B) (B)->il.x.rtl->header_ | |
| 267 #define BB_FOOTER(B) (B)->il.x.rtl->footer_ | |
| 0 | 268 |
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269 /* Special block numbers [markers] for entry and exit. |
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270 Neither of them is supposed to hold actual statements. */ |
| 0 | 271 #define ENTRY_BLOCK (0) |
| 272 #define EXIT_BLOCK (1) | |
| 273 | |
| 274 /* The two blocks that are always in the cfg. */ | |
| 275 #define NUM_FIXED_BLOCKS (2) | |
| 276 | |
| 277 /* This is the value which indicates no edge is present. */ | |
| 278 #define EDGE_INDEX_NO_EDGE -1 | |
| 279 | |
| 280 /* EDGE_INDEX returns an integer index for an edge, or EDGE_INDEX_NO_EDGE | |
| 281 if there is no edge between the 2 basic blocks. */ | |
| 282 #define EDGE_INDEX(el, pred, succ) (find_edge_index ((el), (pred), (succ))) | |
| 283 | |
| 284 /* INDEX_EDGE_PRED_BB and INDEX_EDGE_SUCC_BB return a pointer to the basic | |
| 285 block which is either the pred or succ end of the indexed edge. */ | |
| 286 #define INDEX_EDGE_PRED_BB(el, index) ((el)->index_to_edge[(index)]->src) | |
| 287 #define INDEX_EDGE_SUCC_BB(el, index) ((el)->index_to_edge[(index)]->dest) | |
| 288 | |
| 289 /* INDEX_EDGE returns a pointer to the edge. */ | |
| 290 #define INDEX_EDGE(el, index) ((el)->index_to_edge[(index)]) | |
| 291 | |
| 292 /* Number of edges in the compressed edge list. */ | |
| 293 #define NUM_EDGES(el) ((el)->num_edges) | |
| 294 | |
| 295 /* BB is assumed to contain conditional jump. Return the fallthru edge. */ | |
| 296 #define FALLTHRU_EDGE(bb) (EDGE_SUCC ((bb), 0)->flags & EDGE_FALLTHRU \ | |
| 297 ? EDGE_SUCC ((bb), 0) : EDGE_SUCC ((bb), 1)) | |
| 298 | |
| 299 /* BB is assumed to contain conditional jump. Return the branch edge. */ | |
| 300 #define BRANCH_EDGE(bb) (EDGE_SUCC ((bb), 0)->flags & EDGE_FALLTHRU \ | |
| 301 ? EDGE_SUCC ((bb), 1) : EDGE_SUCC ((bb), 0)) | |
| 302 | |
| 303 /* Return expected execution frequency of the edge E. */ | |
| 111 | 304 #define EDGE_FREQUENCY(e) e->probability.apply (e->src->frequency) |
| 305 | |
| 306 /* Compute a scale factor (or probability) suitable for scaling of | |
| 307 gcov_type values via apply_probability() and apply_scale(). */ | |
| 308 #define GCOV_COMPUTE_SCALE(num,den) \ | |
| 309 ((den) ? RDIV ((num) * REG_BR_PROB_BASE, (den)) : REG_BR_PROB_BASE) | |
| 0 | 310 |
| 311 /* Return nonzero if edge is critical. */ | |
| 312 #define EDGE_CRITICAL_P(e) (EDGE_COUNT ((e)->src->succs) >= 2 \ | |
| 313 && EDGE_COUNT ((e)->dest->preds) >= 2) | |
| 314 | |
| 111 | 315 #define EDGE_COUNT(ev) vec_safe_length (ev) |
| 316 #define EDGE_I(ev,i) (*ev)[(i)] | |
| 317 #define EDGE_PRED(bb,i) (*(bb)->preds)[(i)] | |
| 318 #define EDGE_SUCC(bb,i) (*(bb)->succs)[(i)] | |
| 0 | 319 |
| 320 /* Returns true if BB has precisely one successor. */ | |
| 321 | |
| 322 static inline bool | |
| 323 single_succ_p (const_basic_block bb) | |
| 324 { | |
| 325 return EDGE_COUNT (bb->succs) == 1; | |
| 326 } | |
| 327 | |
| 328 /* Returns true if BB has precisely one predecessor. */ | |
| 329 | |
| 330 static inline bool | |
| 331 single_pred_p (const_basic_block bb) | |
| 332 { | |
| 333 return EDGE_COUNT (bb->preds) == 1; | |
| 334 } | |
| 335 | |
| 336 /* Returns the single successor edge of basic block BB. Aborts if | |
| 337 BB does not have exactly one successor. */ | |
| 338 | |
| 339 static inline edge | |
| 340 single_succ_edge (const_basic_block bb) | |
| 341 { | |
|
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
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changeset
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342 gcc_checking_assert (single_succ_p (bb)); |
| 0 | 343 return EDGE_SUCC (bb, 0); |
| 344 } | |
| 345 | |
| 346 /* Returns the single predecessor edge of basic block BB. Aborts | |
| 347 if BB does not have exactly one predecessor. */ | |
| 348 | |
| 349 static inline edge | |
| 350 single_pred_edge (const_basic_block bb) | |
| 351 { | |
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
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changeset
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352 gcc_checking_assert (single_pred_p (bb)); |
| 0 | 353 return EDGE_PRED (bb, 0); |
| 354 } | |
| 355 | |
| 356 /* Returns the single successor block of basic block BB. Aborts | |
| 357 if BB does not have exactly one successor. */ | |
| 358 | |
| 359 static inline basic_block | |
| 360 single_succ (const_basic_block bb) | |
| 361 { | |
| 362 return single_succ_edge (bb)->dest; | |
| 363 } | |
| 364 | |
| 365 /* Returns the single predecessor block of basic block BB. Aborts | |
| 366 if BB does not have exactly one predecessor.*/ | |
| 367 | |
| 368 static inline basic_block | |
| 369 single_pred (const_basic_block bb) | |
| 370 { | |
| 371 return single_pred_edge (bb)->src; | |
| 372 } | |
| 373 | |
| 374 /* Iterator object for edges. */ | |
| 375 | |
| 111 | 376 struct edge_iterator { |
| 0 | 377 unsigned index; |
| 111 | 378 vec<edge, va_gc> **container; |
| 379 }; | |
| 0 | 380 |
| 111 | 381 static inline vec<edge, va_gc> * |
| 0 | 382 ei_container (edge_iterator i) |
| 383 { | |
|
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parents:
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384 gcc_checking_assert (i.container); |
| 0 | 385 return *i.container; |
| 386 } | |
| 387 | |
| 388 #define ei_start(iter) ei_start_1 (&(iter)) | |
| 389 #define ei_last(iter) ei_last_1 (&(iter)) | |
| 390 | |
| 391 /* Return an iterator pointing to the start of an edge vector. */ | |
| 392 static inline edge_iterator | |
| 111 | 393 ei_start_1 (vec<edge, va_gc> **ev) |
| 0 | 394 { |
| 395 edge_iterator i; | |
| 396 | |
| 397 i.index = 0; | |
| 398 i.container = ev; | |
| 399 | |
| 400 return i; | |
| 401 } | |
| 402 | |
| 403 /* Return an iterator pointing to the last element of an edge | |
| 404 vector. */ | |
| 405 static inline edge_iterator | |
| 111 | 406 ei_last_1 (vec<edge, va_gc> **ev) |
| 0 | 407 { |
| 408 edge_iterator i; | |
| 409 | |
| 410 i.index = EDGE_COUNT (*ev) - 1; | |
| 411 i.container = ev; | |
| 412 | |
| 413 return i; | |
| 414 } | |
| 415 | |
| 416 /* Is the iterator `i' at the end of the sequence? */ | |
| 417 static inline bool | |
| 418 ei_end_p (edge_iterator i) | |
| 419 { | |
| 420 return (i.index == EDGE_COUNT (ei_container (i))); | |
| 421 } | |
| 422 | |
| 423 /* Is the iterator `i' at one position before the end of the | |
| 424 sequence? */ | |
| 425 static inline bool | |
| 426 ei_one_before_end_p (edge_iterator i) | |
| 427 { | |
| 428 return (i.index + 1 == EDGE_COUNT (ei_container (i))); | |
| 429 } | |
| 430 | |
| 431 /* Advance the iterator to the next element. */ | |
| 432 static inline void | |
| 433 ei_next (edge_iterator *i) | |
| 434 { | |
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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435 gcc_checking_assert (i->index < EDGE_COUNT (ei_container (*i))); |
| 0 | 436 i->index++; |
| 437 } | |
| 438 | |
| 439 /* Move the iterator to the previous element. */ | |
| 440 static inline void | |
| 441 ei_prev (edge_iterator *i) | |
| 442 { | |
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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443 gcc_checking_assert (i->index > 0); |
| 0 | 444 i->index--; |
| 445 } | |
| 446 | |
| 447 /* Return the edge pointed to by the iterator `i'. */ | |
| 448 static inline edge | |
| 449 ei_edge (edge_iterator i) | |
| 450 { | |
| 451 return EDGE_I (ei_container (i), i.index); | |
| 452 } | |
| 453 | |
| 454 /* Return an edge pointed to by the iterator. Do it safely so that | |
| 455 NULL is returned when the iterator is pointing at the end of the | |
| 456 sequence. */ | |
| 457 static inline edge | |
| 458 ei_safe_edge (edge_iterator i) | |
| 459 { | |
| 460 return !ei_end_p (i) ? ei_edge (i) : NULL; | |
| 461 } | |
| 462 | |
| 463 /* Return 1 if we should continue to iterate. Return 0 otherwise. | |
| 464 *Edge P is set to the next edge if we are to continue to iterate | |
| 465 and NULL otherwise. */ | |
| 466 | |
| 467 static inline bool | |
| 468 ei_cond (edge_iterator ei, edge *p) | |
| 469 { | |
| 470 if (!ei_end_p (ei)) | |
| 471 { | |
| 472 *p = ei_edge (ei); | |
| 473 return 1; | |
| 474 } | |
| 475 else | |
| 476 { | |
| 477 *p = NULL; | |
| 478 return 0; | |
| 479 } | |
| 480 } | |
| 481 | |
| 482 /* This macro serves as a convenient way to iterate each edge in a | |
| 483 vector of predecessor or successor edges. It must not be used when | |
| 484 an element might be removed during the traversal, otherwise | |
| 485 elements will be missed. Instead, use a for-loop like that shown | |
| 486 in the following pseudo-code: | |
| 487 | |
| 488 FOR (ei = ei_start (bb->succs); (e = ei_safe_edge (ei)); ) | |
| 489 { | |
| 490 IF (e != taken_edge) | |
| 491 remove_edge (e); | |
| 492 ELSE | |
| 493 ei_next (&ei); | |
| 494 } | |
| 495 */ | |
| 496 | |
| 497 #define FOR_EACH_EDGE(EDGE,ITER,EDGE_VEC) \ | |
| 498 for ((ITER) = ei_start ((EDGE_VEC)); \ | |
| 499 ei_cond ((ITER), &(EDGE)); \ | |
| 500 ei_next (&(ITER))) | |
| 501 | |
| 502 #define CLEANUP_EXPENSIVE 1 /* Do relatively expensive optimizations | |
| 503 except for edge forwarding */ | |
| 504 #define CLEANUP_CROSSJUMP 2 /* Do crossjumping. */ | |
| 505 #define CLEANUP_POST_REGSTACK 4 /* We run after reg-stack and need | |
| 506 to care REG_DEAD notes. */ | |
| 507 #define CLEANUP_THREADING 8 /* Do jump threading. */ | |
| 508 #define CLEANUP_NO_INSN_DEL 16 /* Do not try to delete trivially dead | |
| 509 insns. */ | |
| 510 #define CLEANUP_CFGLAYOUT 32 /* Do cleanup in cfglayout mode. */ | |
| 111 | 511 #define CLEANUP_CFG_CHANGED 64 /* The caller changed the CFG. */ |
| 0 | 512 |
| 111 | 513 /* Return true if BB is in a transaction. */ |
| 0 | 514 |
| 111 | 515 static inline bool |
| 516 bb_in_transaction (basic_block bb) | |
| 0 | 517 { |
| 111 | 518 return bb->flags & BB_IN_TRANSACTION; |
| 519 } | |
| 0 | 520 |
| 521 /* Return true when one of the predecessor edges of BB is marked with EDGE_EH. */ | |
| 522 static inline bool | |
| 523 bb_has_eh_pred (basic_block bb) | |
| 524 { | |
| 525 edge e; | |
| 526 edge_iterator ei; | |
| 527 | |
| 528 FOR_EACH_EDGE (e, ei, bb->preds) | |
| 529 { | |
| 530 if (e->flags & EDGE_EH) | |
| 531 return true; | |
| 532 } | |
| 533 return false; | |
| 534 } | |
| 535 | |
| 536 /* Return true when one of the predecessor edges of BB is marked with EDGE_ABNORMAL. */ | |
| 537 static inline bool | |
| 538 bb_has_abnormal_pred (basic_block bb) | |
| 539 { | |
| 540 edge e; | |
| 541 edge_iterator ei; | |
| 542 | |
| 543 FOR_EACH_EDGE (e, ei, bb->preds) | |
| 544 { | |
| 545 if (e->flags & EDGE_ABNORMAL) | |
| 546 return true; | |
| 547 } | |
| 548 return false; | |
| 549 } | |
| 550 | |
|
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551 /* Return the fallthru edge in EDGES if it exists, NULL otherwise. */ |
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552 static inline edge |
| 111 | 553 find_fallthru_edge (vec<edge, va_gc> *edges) |
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554 { |
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555 edge e; |
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556 edge_iterator ei; |
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557 |
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558 FOR_EACH_EDGE (e, ei, edges) |
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559 if (e->flags & EDGE_FALLTHRU) |
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560 break; |
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561 |
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562 return e; |
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563 } |
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564 |
| 111 | 565 /* Check tha probability is sane. */ |
| 566 | |
| 567 static inline void | |
| 568 check_probability (int prob) | |
| 569 { | |
| 570 gcc_checking_assert (prob >= 0 && prob <= REG_BR_PROB_BASE); | |
| 571 } | |
| 572 | |
| 573 /* Given PROB1 and PROB2, return PROB1*PROB2/REG_BR_PROB_BASE. | |
| 574 Used to combine BB probabilities. */ | |
| 575 | |
| 576 static inline int | |
| 577 combine_probabilities (int prob1, int prob2) | |
| 578 { | |
| 579 check_probability (prob1); | |
| 580 check_probability (prob2); | |
| 581 return RDIV (prob1 * prob2, REG_BR_PROB_BASE); | |
| 582 } | |
| 583 | |
| 584 /* Apply scale factor SCALE on frequency or count FREQ. Use this | |
| 585 interface when potentially scaling up, so that SCALE is not | |
| 586 constrained to be < REG_BR_PROB_BASE. */ | |
| 587 | |
| 588 static inline gcov_type | |
| 589 apply_scale (gcov_type freq, gcov_type scale) | |
| 590 { | |
| 591 return RDIV (freq * scale, REG_BR_PROB_BASE); | |
| 592 } | |
| 593 | |
| 594 /* Apply probability PROB on frequency or count FREQ. */ | |
| 595 | |
| 596 static inline gcov_type | |
| 597 apply_probability (gcov_type freq, int prob) | |
| 598 { | |
| 599 check_probability (prob); | |
| 600 return apply_scale (freq, prob); | |
| 601 } | |
| 602 | |
| 603 /* Return inverse probability for PROB. */ | |
| 0 | 604 |
| 111 | 605 static inline int |
| 606 inverse_probability (int prob1) | |
| 607 { | |
| 608 check_probability (prob1); | |
| 609 return REG_BR_PROB_BASE - prob1; | |
| 610 } | |
| 611 | |
| 612 /* Return true if BB has at least one abnormal outgoing edge. */ | |
| 613 | |
| 614 static inline bool | |
| 615 has_abnormal_or_eh_outgoing_edge_p (basic_block bb) | |
| 616 { | |
| 617 edge e; | |
| 618 edge_iterator ei; | |
| 619 | |
| 620 FOR_EACH_EDGE (e, ei, bb->succs) | |
| 621 if (e->flags & (EDGE_ABNORMAL | EDGE_EH)) | |
| 622 return true; | |
| 623 | |
| 624 return false; | |
| 625 } | |
| 626 | |
| 627 /* Return true when one of the predecessor edges of BB is marked with | |
| 628 EDGE_ABNORMAL_CALL or EDGE_EH. */ | |
| 629 | |
| 630 static inline bool | |
| 631 has_abnormal_call_or_eh_pred_edge_p (basic_block bb) | |
| 632 { | |
| 633 edge e; | |
| 634 edge_iterator ei; | |
| 635 | |
| 636 FOR_EACH_EDGE (e, ei, bb->preds) | |
| 637 if (e->flags & (EDGE_ABNORMAL_CALL | EDGE_EH)) | |
| 638 return true; | |
| 639 | |
| 640 return false; | |
| 641 } | |
| 642 | |
| 643 /* Return count of edge E. */ | |
| 644 inline profile_count edge_def::count () const | |
| 645 { | |
| 646 return src->count.apply_probability (probability); | |
| 647 } | |
| 0 | 648 |
| 649 #endif /* GCC_BASIC_BLOCK_H */ |