Mercurial > hg > CbC > CbC_gcc
annotate gcc/tree-ssa-live.c @ 56:3c8a44c06a95
Added tag gcc-4.4.5 for changeset 77e2b8dfacca
| author | ryoma <e075725@ie.u-ryukyu.ac.jp> |
|---|---|
| date | Fri, 12 Feb 2010 23:41:23 +0900 |
| parents | 77e2b8dfacca |
| children | b7f97abdc517 |
| rev | line source |
|---|---|
| 0 | 1 /* Liveness for SSA trees. |
| 2 Copyright (C) 2003, 2004, 2005, 2007, 2008, 2009 Free Software Foundation, | |
| 3 Inc. | |
| 4 Contributed by Andrew MacLeod <amacleod@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 #include "config.h" | |
| 23 #include "system.h" | |
| 24 #include "coretypes.h" | |
| 25 #include "tm.h" | |
| 26 #include "tree.h" | |
| 27 #include "diagnostic.h" | |
| 28 #include "bitmap.h" | |
| 29 #include "tree-flow.h" | |
| 30 #include "tree-dump.h" | |
| 31 #include "tree-ssa-live.h" | |
| 32 #include "toplev.h" | |
| 33 #include "debug.h" | |
| 34 #include "flags.h" | |
| 35 | |
| 36 #ifdef ENABLE_CHECKING | |
| 37 static void verify_live_on_entry (tree_live_info_p); | |
| 38 #endif | |
| 39 | |
| 40 | |
| 41 /* VARMAP maintains a mapping from SSA version number to real variables. | |
| 42 | |
| 43 All SSA_NAMES are divided into partitions. Initially each ssa_name is the | |
| 44 only member of it's own partition. Coalescing will attempt to group any | |
| 45 ssa_names which occur in a copy or in a PHI node into the same partition. | |
| 46 | |
| 47 At the end of out-of-ssa, each partition becomes a "real" variable and is | |
| 48 rewritten as a compiler variable. | |
| 49 | |
| 50 The var_map data structure is used to manage these partitions. It allows | |
| 51 partitions to be combined, and determines which partition belongs to what | |
| 52 ssa_name or variable, and vice versa. */ | |
| 53 | |
| 54 | |
| 55 /* This routine will initialize the basevar fields of MAP. */ | |
| 56 | |
| 57 static void | |
| 58 var_map_base_init (var_map map) | |
| 59 { | |
| 60 int x, num_part, num; | |
| 61 tree var; | |
| 62 var_ann_t ann; | |
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63 |
| 0 | 64 num = 0; |
| 65 num_part = num_var_partitions (map); | |
| 66 | |
| 67 /* If a base table already exists, clear it, otherwise create it. */ | |
| 68 if (map->partition_to_base_index != NULL) | |
| 69 { | |
| 70 free (map->partition_to_base_index); | |
| 71 VEC_truncate (tree, map->basevars, 0); | |
| 72 } | |
| 73 else | |
| 74 map->basevars = VEC_alloc (tree, heap, MAX (40, (num_part / 10))); | |
| 75 | |
| 76 map->partition_to_base_index = (int *) xmalloc (sizeof (int) * num_part); | |
| 77 | |
| 78 /* Build the base variable list, and point partitions at their bases. */ | |
| 79 for (x = 0; x < num_part; x++) | |
| 80 { | |
| 81 var = partition_to_var (map, x); | |
| 82 if (TREE_CODE (var) == SSA_NAME) | |
| 83 var = SSA_NAME_VAR (var); | |
| 84 ann = var_ann (var); | |
| 85 /* If base variable hasn't been seen, set it up. */ | |
| 86 if (!ann->base_var_processed) | |
| 87 { | |
| 88 ann->base_var_processed = 1; | |
| 89 VAR_ANN_BASE_INDEX (ann) = num++; | |
| 90 VEC_safe_push (tree, heap, map->basevars, var); | |
| 91 } | |
| 92 map->partition_to_base_index[x] = VAR_ANN_BASE_INDEX (ann); | |
| 93 } | |
| 94 | |
| 95 map->num_basevars = num; | |
| 96 | |
| 97 /* Now clear the processed bit. */ | |
| 98 for (x = 0; x < num; x++) | |
| 99 { | |
| 100 var = VEC_index (tree, map->basevars, x); | |
| 101 var_ann (var)->base_var_processed = 0; | |
| 102 } | |
| 103 | |
| 104 #ifdef ENABLE_CHECKING | |
| 105 for (x = 0; x < num_part; x++) | |
| 106 { | |
| 107 tree var2; | |
| 108 var = SSA_NAME_VAR (partition_to_var (map, x)); | |
| 109 var2 = VEC_index (tree, map->basevars, basevar_index (map, x)); | |
| 110 gcc_assert (var == var2); | |
| 111 } | |
| 112 #endif | |
| 113 } | |
| 114 | |
| 115 | |
| 116 /* Remove the base table in MAP. */ | |
| 117 | |
| 118 static void | |
| 119 var_map_base_fini (var_map map) | |
| 120 { | |
| 121 /* Free the basevar info if it is present. */ | |
| 122 if (map->partition_to_base_index != NULL) | |
| 123 { | |
| 124 VEC_free (tree, heap, map->basevars); | |
| 125 free (map->partition_to_base_index); | |
| 126 map->partition_to_base_index = NULL; | |
| 127 map->num_basevars = 0; | |
| 128 } | |
| 129 } | |
| 130 /* Create a variable partition map of SIZE, initialize and return it. */ | |
| 131 | |
| 132 var_map | |
| 133 init_var_map (int size) | |
| 134 { | |
| 135 var_map map; | |
| 136 | |
| 137 map = (var_map) xmalloc (sizeof (struct _var_map)); | |
| 138 map->var_partition = partition_new (size); | |
| 139 | |
| 140 map->partition_to_view = NULL; | |
| 141 map->view_to_partition = NULL; | |
| 142 map->num_partitions = size; | |
| 143 map->partition_size = size; | |
| 144 map->num_basevars = 0; | |
| 145 map->partition_to_base_index = NULL; | |
| 146 map->basevars = NULL; | |
| 147 return map; | |
| 148 } | |
| 149 | |
| 150 | |
| 151 /* Free memory associated with MAP. */ | |
| 152 | |
| 153 void | |
| 154 delete_var_map (var_map map) | |
| 155 { | |
| 156 var_map_base_fini (map); | |
| 157 partition_delete (map->var_partition); | |
| 158 if (map->partition_to_view) | |
| 159 free (map->partition_to_view); | |
| 160 if (map->view_to_partition) | |
| 161 free (map->view_to_partition); | |
| 162 free (map); | |
| 163 } | |
| 164 | |
| 165 | |
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166 /* This function will combine the partitions in MAP for VAR1 and VAR2. It |
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167 Returns the partition which represents the new partition. If the two |
| 0 | 168 partitions cannot be combined, NO_PARTITION is returned. */ |
| 169 | |
| 170 int | |
| 171 var_union (var_map map, tree var1, tree var2) | |
| 172 { | |
| 173 int p1, p2, p3; | |
| 174 | |
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175 gcc_assert (TREE_CODE (var1) == SSA_NAME); |
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176 gcc_assert (TREE_CODE (var2) == SSA_NAME); |
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177 |
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178 /* This is independent of partition_to_view. If partition_to_view is |
| 0 | 179 on, then whichever one of these partitions is absorbed will never have a |
| 180 dereference into the partition_to_view array any more. */ | |
| 181 | |
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182 p1 = partition_find (map->var_partition, SSA_NAME_VERSION (var1)); |
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183 p2 = partition_find (map->var_partition, SSA_NAME_VERSION (var2)); |
| 0 | 184 |
| 185 gcc_assert (p1 != NO_PARTITION); | |
| 186 gcc_assert (p2 != NO_PARTITION); | |
| 187 | |
| 188 if (p1 == p2) | |
| 189 p3 = p1; | |
| 190 else | |
| 191 p3 = partition_union (map->var_partition, p1, p2); | |
| 192 | |
| 193 if (map->partition_to_view) | |
| 194 p3 = map->partition_to_view[p3]; | |
| 195 | |
| 196 return p3; | |
| 197 } | |
| 198 | |
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199 |
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200 /* Compress the partition numbers in MAP such that they fall in the range |
| 0 | 201 0..(num_partitions-1) instead of wherever they turned out during |
| 202 the partitioning exercise. This removes any references to unused | |
| 203 partitions, thereby allowing bitmaps and other vectors to be much | |
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204 denser. |
| 0 | 205 |
| 206 This is implemented such that compaction doesn't affect partitioning. | |
| 207 Ie., once partitions are created and possibly merged, running one | |
| 208 or more different kind of compaction will not affect the partitions | |
| 209 themselves. Their index might change, but all the same variables will | |
| 210 still be members of the same partition group. This allows work on reduced | |
| 211 sets, and no loss of information when a larger set is later desired. | |
| 212 | |
| 213 In particular, coalescing can work on partitions which have 2 or more | |
| 214 definitions, and then 'recompact' later to include all the single | |
| 215 definitions for assignment to program variables. */ | |
| 216 | |
| 217 | |
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218 /* Set MAP back to the initial state of having no partition view. Return a |
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219 bitmap which has a bit set for each partition number which is in use in the |
| 0 | 220 varmap. */ |
| 221 | |
| 222 static bitmap | |
| 223 partition_view_init (var_map map) | |
| 224 { | |
| 225 bitmap used; | |
| 226 int tmp; | |
| 227 unsigned int x; | |
| 228 | |
| 229 used = BITMAP_ALLOC (NULL); | |
| 230 | |
| 231 /* Already in a view? Abandon the old one. */ | |
| 232 if (map->partition_to_view) | |
| 233 { | |
| 234 free (map->partition_to_view); | |
| 235 map->partition_to_view = NULL; | |
| 236 } | |
| 237 if (map->view_to_partition) | |
| 238 { | |
| 239 free (map->view_to_partition); | |
| 240 map->view_to_partition = NULL; | |
| 241 } | |
| 242 | |
| 243 /* Find out which partitions are actually referenced. */ | |
| 244 for (x = 0; x < map->partition_size; x++) | |
| 245 { | |
| 246 tmp = partition_find (map->var_partition, x); | |
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247 if (ssa_name (tmp) != NULL_TREE && is_gimple_reg (ssa_name (tmp)) |
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248 && (!has_zero_uses (ssa_name (tmp)) |
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249 || !SSA_NAME_IS_DEFAULT_DEF (ssa_name (tmp)))) |
| 0 | 250 bitmap_set_bit (used, tmp); |
| 251 } | |
| 252 | |
| 253 map->num_partitions = map->partition_size; | |
| 254 return used; | |
| 255 } | |
| 256 | |
| 257 | |
| 258 /* This routine will finalize the view data for MAP based on the partitions | |
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259 set in SELECTED. This is either the same bitmap returned from |
| 0 | 260 partition_view_init, or a trimmed down version if some of those partitions |
| 261 were not desired in this view. SELECTED is freed before returning. */ | |
| 262 | |
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263 static void |
| 0 | 264 partition_view_fini (var_map map, bitmap selected) |
| 265 { | |
| 266 bitmap_iterator bi; | |
| 267 unsigned count, i, x, limit; | |
| 268 | |
| 269 gcc_assert (selected); | |
| 270 | |
| 271 count = bitmap_count_bits (selected); | |
| 272 limit = map->partition_size; | |
| 273 | |
| 274 /* If its a one-to-one ratio, we don't need any view compaction. */ | |
| 275 if (count < limit) | |
| 276 { | |
| 277 map->partition_to_view = (int *)xmalloc (limit * sizeof (int)); | |
| 278 memset (map->partition_to_view, 0xff, (limit * sizeof (int))); | |
| 279 map->view_to_partition = (int *)xmalloc (count * sizeof (int)); | |
| 280 | |
| 281 i = 0; | |
| 282 /* Give each selected partition an index. */ | |
| 283 EXECUTE_IF_SET_IN_BITMAP (selected, 0, x, bi) | |
| 284 { | |
| 285 map->partition_to_view[x] = i; | |
| 286 map->view_to_partition[i] = x; | |
| 287 i++; | |
| 288 } | |
| 289 gcc_assert (i == count); | |
| 290 map->num_partitions = i; | |
| 291 } | |
| 292 | |
| 293 BITMAP_FREE (selected); | |
| 294 } | |
| 295 | |
| 296 | |
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297 /* Create a partition view which includes all the used partitions in MAP. If |
| 0 | 298 WANT_BASES is true, create the base variable map as well. */ |
| 299 | |
| 300 extern void | |
| 301 partition_view_normal (var_map map, bool want_bases) | |
| 302 { | |
| 303 bitmap used; | |
| 304 | |
| 305 used = partition_view_init (map); | |
| 306 partition_view_fini (map, used); | |
| 307 | |
| 308 if (want_bases) | |
| 309 var_map_base_init (map); | |
| 310 else | |
| 311 var_map_base_fini (map); | |
| 312 } | |
| 313 | |
| 314 | |
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315 /* Create a partition view in MAP which includes just partitions which occur in |
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316 the bitmap ONLY. If WANT_BASES is true, create the base variable map |
| 0 | 317 as well. */ |
| 318 | |
| 319 extern void | |
| 320 partition_view_bitmap (var_map map, bitmap only, bool want_bases) | |
| 321 { | |
| 322 bitmap used; | |
| 323 bitmap new_partitions = BITMAP_ALLOC (NULL); | |
| 324 unsigned x, p; | |
| 325 bitmap_iterator bi; | |
| 326 | |
| 327 used = partition_view_init (map); | |
| 328 EXECUTE_IF_SET_IN_BITMAP (only, 0, x, bi) | |
| 329 { | |
| 330 p = partition_find (map->var_partition, x); | |
| 331 gcc_assert (bitmap_bit_p (used, p)); | |
| 332 bitmap_set_bit (new_partitions, p); | |
| 333 } | |
| 334 partition_view_fini (map, new_partitions); | |
| 335 | |
| 336 BITMAP_FREE (used); | |
| 337 if (want_bases) | |
| 338 var_map_base_init (map); | |
| 339 else | |
| 340 var_map_base_fini (map); | |
| 341 } | |
| 342 | |
| 343 | |
| 344 static inline void mark_all_vars_used (tree *, void *data); | |
| 345 | |
| 346 /* Helper function for mark_all_vars_used, called via walk_tree. */ | |
| 347 | |
| 348 static tree | |
| 349 mark_all_vars_used_1 (tree *tp, int *walk_subtrees, void *data) | |
| 350 { | |
| 351 tree t = *tp; | |
| 352 enum tree_code_class c = TREE_CODE_CLASS (TREE_CODE (t)); | |
| 353 tree b; | |
| 354 | |
| 355 if (TREE_CODE (t) == SSA_NAME) | |
| 356 t = SSA_NAME_VAR (t); | |
| 357 | |
| 358 if (IS_EXPR_CODE_CLASS (c) | |
| 359 && (b = TREE_BLOCK (t)) != NULL) | |
| 360 TREE_USED (b) = true; | |
| 361 | |
| 362 /* Ignore TREE_ORIGINAL for TARGET_MEM_REFS, as well as other | |
| 363 fields that do not contain vars. */ | |
| 364 if (TREE_CODE (t) == TARGET_MEM_REF) | |
| 365 { | |
| 366 mark_all_vars_used (&TMR_SYMBOL (t), data); | |
| 367 mark_all_vars_used (&TMR_BASE (t), data); | |
| 368 mark_all_vars_used (&TMR_INDEX (t), data); | |
| 369 *walk_subtrees = 0; | |
| 370 return NULL; | |
| 371 } | |
| 372 | |
| 373 /* Only need to mark VAR_DECLS; parameters and return results are not | |
| 374 eliminated as unused. */ | |
| 375 if (TREE_CODE (t) == VAR_DECL) | |
| 376 { | |
| 377 if (data != NULL && bitmap_bit_p ((bitmap) data, DECL_UID (t))) | |
| 378 { | |
| 379 bitmap_clear_bit ((bitmap) data, DECL_UID (t)); | |
| 380 mark_all_vars_used (&DECL_INITIAL (t), data); | |
| 381 } | |
| 382 set_is_used (t); | |
| 383 } | |
| 384 | |
| 385 if (IS_TYPE_OR_DECL_P (t)) | |
| 386 *walk_subtrees = 0; | |
| 387 | |
| 388 return NULL; | |
| 389 } | |
| 390 | |
| 391 /* Mark the scope block SCOPE and its subblocks unused when they can be | |
| 392 possibly eliminated if dead. */ | |
| 393 | |
| 394 static void | |
| 395 mark_scope_block_unused (tree scope) | |
| 396 { | |
| 397 tree t; | |
| 398 TREE_USED (scope) = false; | |
| 399 if (!(*debug_hooks->ignore_block) (scope)) | |
| 400 TREE_USED (scope) = true; | |
| 401 for (t = BLOCK_SUBBLOCKS (scope); t ; t = BLOCK_CHAIN (t)) | |
| 402 mark_scope_block_unused (t); | |
| 403 } | |
| 404 | |
| 405 /* Look if the block is dead (by possibly eliminating its dead subblocks) | |
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406 and return true if so. |
| 0 | 407 Block is declared dead if: |
| 408 1) No statements are associated with it. | |
| 409 2) Declares no live variables | |
| 410 3) All subblocks are dead | |
| 411 or there is precisely one subblocks and the block | |
| 412 has same abstract origin as outer block and declares | |
| 413 no variables, so it is pure wrapper. | |
| 414 When we are not outputting full debug info, we also eliminate dead variables | |
| 415 out of scope blocks to let them to be recycled by GGC and to save copying work | |
| 416 done by the inliner. */ | |
| 417 | |
| 418 static bool | |
| 419 remove_unused_scope_block_p (tree scope) | |
| 420 { | |
| 421 tree *t, *next; | |
| 422 bool unused = !TREE_USED (scope); | |
| 423 var_ann_t ann; | |
| 424 int nsubblocks = 0; | |
| 425 | |
| 426 for (t = &BLOCK_VARS (scope); *t; t = next) | |
| 427 { | |
| 428 next = &TREE_CHAIN (*t); | |
| 429 | |
| 430 /* Debug info of nested function refers to the block of the | |
| 431 function. We might stil call it even if all statements | |
| 432 of function it was nested into was elliminated. | |
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433 |
| 0 | 434 TODO: We can actually look into cgraph to see if function |
| 435 will be output to file. */ | |
| 436 if (TREE_CODE (*t) == FUNCTION_DECL) | |
| 437 unused = false; | |
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438 |
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439 /* If a decl has a value expr, we need to instantiate it |
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440 regardless of debug info generation, to avoid codegen |
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441 differences in memory overlap tests. update_equiv_regs() may |
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442 indirectly call validate_equiv_mem() to test whether a |
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443 SET_DEST overlaps with others, and if the value expr changes |
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444 by virtual register instantiation, we may get end up with |
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445 different results. */ |
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446 else if (TREE_CODE (*t) == VAR_DECL && DECL_HAS_VALUE_EXPR_P (*t)) |
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447 unused = false; |
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448 |
| 0 | 449 /* Remove everything we don't generate debug info for. */ |
| 450 else if (DECL_IGNORED_P (*t)) | |
| 451 { | |
| 452 *t = TREE_CHAIN (*t); | |
| 453 next = t; | |
| 454 } | |
| 455 | |
| 456 /* When we are outputting debug info, we usually want to output | |
| 457 info about optimized-out variables in the scope blocks. | |
| 458 Exception are the scope blocks not containing any instructions | |
| 459 at all so user can't get into the scopes at first place. */ | |
| 460 else if ((ann = var_ann (*t)) != NULL | |
| 461 && ann->used) | |
| 462 unused = false; | |
| 463 | |
| 464 /* When we are not doing full debug info, we however can keep around | |
| 465 only the used variables for cfgexpand's memory packing saving quite | |
|
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466 a lot of memory. |
| 0 | 467 |
| 468 For sake of -g3, we keep around those vars but we don't count this as | |
| 469 use of block, so innermost block with no used vars and no instructions | |
| 470 can be considered dead. We only want to keep around blocks user can | |
|
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471 breakpoint into and ask about value of optimized out variables. |
| 0 | 472 |
| 473 Similarly we need to keep around types at least until all variables of | |
| 474 all nested blocks are gone. We track no information on whether given | |
| 475 type is used or not. */ | |
| 476 | |
| 477 else if (debug_info_level == DINFO_LEVEL_NORMAL | |
|
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478 || debug_info_level == DINFO_LEVEL_VERBOSE) |
| 0 | 479 ; |
| 480 else | |
| 481 { | |
| 482 *t = TREE_CHAIN (*t); | |
| 483 next = t; | |
| 484 } | |
| 485 } | |
| 486 | |
| 487 for (t = &BLOCK_SUBBLOCKS (scope); *t ;) | |
| 488 if (remove_unused_scope_block_p (*t)) | |
| 489 { | |
| 490 if (BLOCK_SUBBLOCKS (*t)) | |
| 491 { | |
| 492 tree next = BLOCK_CHAIN (*t); | |
| 493 tree supercontext = BLOCK_SUPERCONTEXT (*t); | |
| 494 | |
| 495 *t = BLOCK_SUBBLOCKS (*t); | |
| 496 while (BLOCK_CHAIN (*t)) | |
| 497 { | |
| 498 BLOCK_SUPERCONTEXT (*t) = supercontext; | |
| 499 t = &BLOCK_CHAIN (*t); | |
| 500 } | |
| 501 BLOCK_CHAIN (*t) = next; | |
| 502 BLOCK_SUPERCONTEXT (*t) = supercontext; | |
| 503 t = &BLOCK_CHAIN (*t); | |
| 504 nsubblocks ++; | |
| 505 } | |
| 506 else | |
| 507 *t = BLOCK_CHAIN (*t); | |
| 508 } | |
| 509 else | |
| 510 { | |
| 511 t = &BLOCK_CHAIN (*t); | |
| 512 nsubblocks ++; | |
| 513 } | |
| 514 | |
| 515 | |
| 516 if (!unused) | |
| 517 ; | |
| 518 /* Outer scope is always used. */ | |
| 519 else if (!BLOCK_SUPERCONTEXT (scope) | |
| 520 || TREE_CODE (BLOCK_SUPERCONTEXT (scope)) == FUNCTION_DECL) | |
| 521 unused = false; | |
| 522 /* Innermost blocks with no live variables nor statements can be always | |
| 523 eliminated. */ | |
| 524 else if (!nsubblocks) | |
| 525 ; | |
| 526 /* For terse debug info we can eliminate info on unused variables. */ | |
| 527 else if (debug_info_level == DINFO_LEVEL_NONE | |
| 528 || debug_info_level == DINFO_LEVEL_TERSE) | |
|
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529 { |
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530 /* Even for -g0/-g1 don't prune outer scopes from artificial |
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531 functions, otherwise diagnostics using tree_nonartificial_location |
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532 will not be emitted properly. */ |
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533 if (inlined_function_outer_scope_p (scope)) |
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534 { |
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535 tree ao = scope; |
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536 |
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537 while (ao |
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538 && TREE_CODE (ao) == BLOCK |
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539 && BLOCK_ABSTRACT_ORIGIN (ao) != ao) |
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540 ao = BLOCK_ABSTRACT_ORIGIN (ao); |
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541 if (ao |
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542 && TREE_CODE (ao) == FUNCTION_DECL |
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543 && DECL_DECLARED_INLINE_P (ao) |
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544 && lookup_attribute ("artificial", DECL_ATTRIBUTES (ao))) |
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545 unused = false; |
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546 } |
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547 } |
| 0 | 548 else if (BLOCK_VARS (scope) || BLOCK_NUM_NONLOCALIZED_VARS (scope)) |
| 549 unused = false; | |
| 550 /* See if this block is important for representation of inlined function. | |
| 551 Inlined functions are always represented by block with | |
| 552 block_ultimate_origin being set to FUNCTION_DECL and DECL_SOURCE_LOCATION | |
| 553 set... */ | |
| 554 else if (inlined_function_outer_scope_p (scope)) | |
| 555 unused = false; | |
| 556 else | |
| 557 /* Verfify that only blocks with source location set | |
| 558 are entry points to the inlined functions. */ | |
| 559 gcc_assert (BLOCK_SOURCE_LOCATION (scope) == UNKNOWN_LOCATION); | |
|
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560 |
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561 TREE_USED (scope) = !unused; |
| 0 | 562 return unused; |
| 563 } | |
| 564 | |
|
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565 /* Mark all VAR_DECLS under *EXPR_P as used, so that they won't be |
| 0 | 566 eliminated during the tree->rtl conversion process. */ |
| 567 | |
| 568 static inline void | |
| 569 mark_all_vars_used (tree *expr_p, void *data) | |
| 570 { | |
| 571 walk_tree (expr_p, mark_all_vars_used_1, data, NULL); | |
| 572 } | |
| 573 | |
|
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574 |
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575 /* Dump scope blocks starting at SCOPE to FILE. INDENT is the |
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576 indentation level and FLAGS is as in print_generic_expr. */ |
| 0 | 577 |
| 578 static void | |
| 579 dump_scope_block (FILE *file, int indent, tree scope, int flags) | |
| 580 { | |
| 581 tree var, t; | |
| 582 unsigned int i; | |
| 583 | |
| 584 fprintf (file, "\n%*s{ Scope block #%i%s%s",indent, "" , BLOCK_NUMBER (scope), | |
| 585 TREE_USED (scope) ? "" : " (unused)", | |
| 586 BLOCK_ABSTRACT (scope) ? " (abstract)": ""); | |
| 587 if (BLOCK_SOURCE_LOCATION (scope) != UNKNOWN_LOCATION) | |
| 588 { | |
| 589 expanded_location s = expand_location (BLOCK_SOURCE_LOCATION (scope)); | |
| 590 fprintf (file, " %s:%i", s.file, s.line); | |
| 591 } | |
| 592 if (BLOCK_ABSTRACT_ORIGIN (scope)) | |
| 593 { | |
| 594 tree origin = block_ultimate_origin (scope); | |
| 595 if (origin) | |
| 596 { | |
| 597 fprintf (file, " Originating from :"); | |
| 598 if (DECL_P (origin)) | |
| 599 print_generic_decl (file, origin, flags); | |
| 600 else | |
| 601 fprintf (file, "#%i", BLOCK_NUMBER (origin)); | |
| 602 } | |
| 603 } | |
| 604 fprintf (file, " \n"); | |
| 605 for (var = BLOCK_VARS (scope); var; var = TREE_CHAIN (var)) | |
| 606 { | |
| 607 bool used = false; | |
| 608 var_ann_t ann; | |
| 609 | |
| 610 if ((ann = var_ann (var)) | |
| 611 && ann->used) | |
| 612 used = true; | |
| 613 | |
| 614 fprintf (file, "%*s",indent, ""); | |
| 615 print_generic_decl (file, var, flags); | |
| 616 fprintf (file, "%s\n", used ? "" : " (unused)"); | |
| 617 } | |
| 618 for (i = 0; i < BLOCK_NUM_NONLOCALIZED_VARS (scope); i++) | |
| 619 { | |
| 620 fprintf (file, "%*s",indent, ""); | |
| 621 print_generic_decl (file, BLOCK_NONLOCALIZED_VAR (scope, i), | |
| 622 flags); | |
| 623 fprintf (file, " (nonlocalized)\n"); | |
| 624 } | |
| 625 for (t = BLOCK_SUBBLOCKS (scope); t ; t = BLOCK_CHAIN (t)) | |
| 626 dump_scope_block (file, indent + 2, t, flags); | |
| 627 fprintf (file, "\n%*s}\n",indent, ""); | |
| 628 } | |
| 629 | |
|
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630 /* Dump the tree of lexical scopes starting at SCOPE to stderr. FLAGS |
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631 is as in print_generic_expr. */ |
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632 |
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633 void |
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634 debug_scope_block (tree scope, int flags) |
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635 { |
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636 dump_scope_block (stderr, 0, scope, flags); |
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637 } |
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638 |
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639 |
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640 /* Dump the tree of lexical scopes of current_function_decl to FILE. |
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641 FLAGS is as in print_generic_expr. */ |
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642 |
| 0 | 643 void |
| 644 dump_scope_blocks (FILE *file, int flags) | |
| 645 { | |
| 646 dump_scope_block (file, 0, DECL_INITIAL (current_function_decl), flags); | |
| 647 } | |
| 648 | |
|
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649 |
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650 /* Dump the tree of lexical scopes of current_function_decl to stderr. |
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651 FLAGS is as in print_generic_expr. */ |
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652 |
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653 void |
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654 debug_scope_blocks (int flags) |
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655 { |
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656 dump_scope_blocks (stderr, flags); |
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657 } |
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658 |
| 0 | 659 /* Remove local variables that are not referenced in the IL. */ |
| 660 | |
| 661 void | |
| 662 remove_unused_locals (void) | |
| 663 { | |
| 664 basic_block bb; | |
| 665 tree t, *cell; | |
| 666 referenced_var_iterator rvi; | |
| 667 var_ann_t ann; | |
| 668 bitmap global_unused_vars = NULL; | |
| 669 | |
|
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670 /* Removing declarations from lexical blocks when not optimizing is |
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671 not only a waste of time, it actually causes differences in stack |
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672 layout. */ |
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673 if (!optimize) |
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674 return; |
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675 |
| 0 | 676 mark_scope_block_unused (DECL_INITIAL (current_function_decl)); |
| 677 | |
| 678 /* Assume all locals are unused. */ | |
| 679 FOR_EACH_REFERENCED_VAR (t, rvi) | |
| 680 var_ann (t)->used = false; | |
| 681 | |
| 682 /* Walk the CFG marking all referenced symbols. */ | |
| 683 FOR_EACH_BB (bb) | |
| 684 { | |
| 685 gimple_stmt_iterator gsi; | |
| 686 size_t i; | |
| 687 edge_iterator ei; | |
| 688 edge e; | |
| 689 | |
| 690 /* Walk the statements. */ | |
| 691 for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi)) | |
| 692 { | |
| 693 gimple stmt = gsi_stmt (gsi); | |
| 694 tree b = gimple_block (stmt); | |
| 695 | |
|
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696 if (is_gimple_debug (stmt)) |
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697 continue; |
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698 |
| 0 | 699 if (b) |
| 700 TREE_USED (b) = true; | |
| 701 | |
| 702 for (i = 0; i < gimple_num_ops (stmt); i++) | |
| 703 mark_all_vars_used (gimple_op_ptr (gsi_stmt (gsi), i), NULL); | |
| 704 } | |
| 705 | |
| 706 for (gsi = gsi_start_phis (bb); !gsi_end_p (gsi); gsi_next (&gsi)) | |
| 707 { | |
| 708 use_operand_p arg_p; | |
| 709 ssa_op_iter i; | |
| 710 tree def; | |
| 711 gimple phi = gsi_stmt (gsi); | |
| 712 | |
| 713 /* No point processing globals. */ | |
| 714 if (is_global_var (SSA_NAME_VAR (gimple_phi_result (phi)))) | |
| 715 continue; | |
| 716 | |
| 717 def = gimple_phi_result (phi); | |
| 718 mark_all_vars_used (&def, NULL); | |
| 719 | |
| 720 FOR_EACH_PHI_ARG (arg_p, phi, i, SSA_OP_ALL_USES) | |
| 721 { | |
| 722 tree arg = USE_FROM_PTR (arg_p); | |
| 723 mark_all_vars_used (&arg, NULL); | |
| 724 } | |
| 725 } | |
| 726 | |
| 727 FOR_EACH_EDGE (e, ei, bb->succs) | |
| 728 if (e->goto_locus) | |
| 729 TREE_USED (e->goto_block) = true; | |
| 730 } | |
| 731 | |
| 732 cfun->has_local_explicit_reg_vars = false; | |
| 733 | |
| 734 /* Remove unmarked local vars from local_decls. */ | |
| 735 for (cell = &cfun->local_decls; *cell; ) | |
| 736 { | |
| 737 tree var = TREE_VALUE (*cell); | |
| 738 | |
| 739 if (TREE_CODE (var) != FUNCTION_DECL | |
| 740 && (!(ann = var_ann (var)) | |
|
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741 || !ann->used)) |
| 0 | 742 { |
| 743 if (is_global_var (var)) | |
| 744 { | |
| 745 if (global_unused_vars == NULL) | |
| 746 global_unused_vars = BITMAP_ALLOC (NULL); | |
| 747 bitmap_set_bit (global_unused_vars, DECL_UID (var)); | |
| 748 } | |
| 749 else | |
| 750 { | |
| 751 *cell = TREE_CHAIN (*cell); | |
| 752 continue; | |
| 753 } | |
| 754 } | |
| 755 else if (TREE_CODE (var) == VAR_DECL | |
| 756 && DECL_HARD_REGISTER (var) | |
| 757 && !is_global_var (var)) | |
| 758 cfun->has_local_explicit_reg_vars = true; | |
| 759 cell = &TREE_CHAIN (*cell); | |
| 760 } | |
| 761 | |
| 762 /* Remove unmarked global vars from local_decls. */ | |
| 763 if (global_unused_vars != NULL) | |
| 764 { | |
| 765 for (t = cfun->local_decls; t; t = TREE_CHAIN (t)) | |
| 766 { | |
| 767 tree var = TREE_VALUE (t); | |
| 768 | |
| 769 if (TREE_CODE (var) == VAR_DECL | |
| 770 && is_global_var (var) | |
| 771 && (ann = var_ann (var)) != NULL | |
| 772 && ann->used) | |
| 773 mark_all_vars_used (&DECL_INITIAL (var), global_unused_vars); | |
| 774 } | |
| 775 | |
| 776 for (cell = &cfun->local_decls; *cell; ) | |
| 777 { | |
| 778 tree var = TREE_VALUE (*cell); | |
| 779 | |
| 780 if (TREE_CODE (var) == VAR_DECL | |
| 781 && is_global_var (var) | |
| 782 && bitmap_bit_p (global_unused_vars, DECL_UID (var))) | |
| 783 *cell = TREE_CHAIN (*cell); | |
| 784 else | |
| 785 cell = &TREE_CHAIN (*cell); | |
| 786 } | |
| 787 BITMAP_FREE (global_unused_vars); | |
| 788 } | |
| 789 | |
| 790 /* Remove unused variables from REFERENCED_VARs. As a special | |
| 791 exception keep the variables that are believed to be aliased. | |
| 792 Those can't be easily removed from the alias sets and operand | |
| 793 caches. They will be removed shortly after the next may_alias | |
| 794 pass is performed. */ | |
| 795 FOR_EACH_REFERENCED_VAR (t, rvi) | |
| 796 if (!is_global_var (t) | |
| 797 && TREE_CODE (t) != PARM_DECL | |
| 798 && TREE_CODE (t) != RESULT_DECL | |
| 799 && !(ann = var_ann (t))->used | |
|
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800 && !ann->is_heapvar |
|
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801 && !TREE_ADDRESSABLE (t)) |
| 0 | 802 remove_referenced_var (t); |
| 803 remove_unused_scope_block_p (DECL_INITIAL (current_function_decl)); | |
| 804 if (dump_file && (dump_flags & TDF_DETAILS)) | |
| 805 { | |
| 806 fprintf (dump_file, "Scope blocks after cleanups:\n"); | |
| 807 dump_scope_blocks (dump_file, dump_flags); | |
| 808 } | |
| 809 } | |
| 810 | |
| 811 | |
| 812 /* Allocate and return a new live range information object base on MAP. */ | |
| 813 | |
| 814 static tree_live_info_p | |
| 815 new_tree_live_info (var_map map) | |
| 816 { | |
| 817 tree_live_info_p live; | |
| 818 unsigned x; | |
| 819 | |
| 820 live = (tree_live_info_p) xmalloc (sizeof (struct tree_live_info_d)); | |
| 821 live->map = map; | |
| 822 live->num_blocks = last_basic_block; | |
| 823 | |
| 824 live->livein = (bitmap *)xmalloc (last_basic_block * sizeof (bitmap)); | |
| 825 for (x = 0; x < (unsigned)last_basic_block; x++) | |
| 826 live->livein[x] = BITMAP_ALLOC (NULL); | |
| 827 | |
| 828 live->liveout = (bitmap *)xmalloc (last_basic_block * sizeof (bitmap)); | |
| 829 for (x = 0; x < (unsigned)last_basic_block; x++) | |
| 830 live->liveout[x] = BITMAP_ALLOC (NULL); | |
| 831 | |
| 832 live->work_stack = XNEWVEC (int, last_basic_block); | |
| 833 live->stack_top = live->work_stack; | |
| 834 | |
| 835 live->global = BITMAP_ALLOC (NULL); | |
| 836 return live; | |
| 837 } | |
| 838 | |
| 839 | |
| 840 /* Free storage for live range info object LIVE. */ | |
| 841 | |
|
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842 void |
| 0 | 843 delete_tree_live_info (tree_live_info_p live) |
| 844 { | |
| 845 int x; | |
| 846 | |
| 847 BITMAP_FREE (live->global); | |
| 848 free (live->work_stack); | |
| 849 | |
| 850 for (x = live->num_blocks - 1; x >= 0; x--) | |
| 851 BITMAP_FREE (live->liveout[x]); | |
| 852 free (live->liveout); | |
| 853 | |
| 854 for (x = live->num_blocks - 1; x >= 0; x--) | |
| 855 BITMAP_FREE (live->livein[x]); | |
| 856 free (live->livein); | |
| 857 | |
| 858 free (live); | |
| 859 } | |
| 860 | |
| 861 | |
|
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862 /* Visit basic block BB and propagate any required live on entry bits from |
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863 LIVE into the predecessors. VISITED is the bitmap of visited blocks. |
| 0 | 864 TMP is a temporary work bitmap which is passed in to avoid reallocating |
| 865 it each time. */ | |
| 866 | |
|
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867 static void |
| 0 | 868 loe_visit_block (tree_live_info_p live, basic_block bb, sbitmap visited, |
| 869 bitmap tmp) | |
| 870 { | |
| 871 edge e; | |
| 872 bool change; | |
| 873 edge_iterator ei; | |
| 874 basic_block pred_bb; | |
| 875 bitmap loe; | |
| 876 gcc_assert (!TEST_BIT (visited, bb->index)); | |
| 877 | |
| 878 SET_BIT (visited, bb->index); | |
| 879 loe = live_on_entry (live, bb); | |
| 880 | |
| 881 FOR_EACH_EDGE (e, ei, bb->preds) | |
| 882 { | |
| 883 pred_bb = e->src; | |
| 884 if (pred_bb == ENTRY_BLOCK_PTR) | |
| 885 continue; | |
| 886 /* TMP is variables live-on-entry from BB that aren't defined in the | |
|
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887 predecessor block. This should be the live on entry vars to pred. |
| 0 | 888 Note that liveout is the DEFs in a block while live on entry is |
| 889 being calculated. */ | |
| 890 bitmap_and_compl (tmp, loe, live->liveout[pred_bb->index]); | |
| 891 | |
|
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892 /* Add these bits to live-on-entry for the pred. if there are any |
| 0 | 893 changes, and pred_bb has been visited already, add it to the |
| 894 revisit stack. */ | |
| 895 change = bitmap_ior_into (live_on_entry (live, pred_bb), tmp); | |
| 896 if (TEST_BIT (visited, pred_bb->index) && change) | |
| 897 { | |
| 898 RESET_BIT (visited, pred_bb->index); | |
| 899 *(live->stack_top)++ = pred_bb->index; | |
| 900 } | |
| 901 } | |
| 902 } | |
| 903 | |
| 904 | |
|
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905 /* Using LIVE, fill in all the live-on-entry blocks between the defs and uses |
| 0 | 906 of all the variables. */ |
| 907 | |
| 908 static void | |
| 909 live_worklist (tree_live_info_p live) | |
| 910 { | |
| 911 unsigned b; | |
| 912 basic_block bb; | |
| 913 sbitmap visited = sbitmap_alloc (last_basic_block + 1); | |
| 914 bitmap tmp = BITMAP_ALLOC (NULL); | |
| 915 | |
| 916 sbitmap_zero (visited); | |
| 917 | |
| 918 /* Visit all the blocks in reverse order and propagate live on entry values | |
| 919 into the predecessors blocks. */ | |
| 920 FOR_EACH_BB_REVERSE (bb) | |
| 921 loe_visit_block (live, bb, visited, tmp); | |
| 922 | |
| 923 /* Process any blocks which require further iteration. */ | |
| 924 while (live->stack_top != live->work_stack) | |
| 925 { | |
| 926 b = *--(live->stack_top); | |
| 927 loe_visit_block (live, BASIC_BLOCK (b), visited, tmp); | |
| 928 } | |
| 929 | |
| 930 BITMAP_FREE (tmp); | |
| 931 sbitmap_free (visited); | |
| 932 } | |
| 933 | |
| 934 | |
| 935 /* Calculate the initial live on entry vector for SSA_NAME using immediate_use | |
| 936 links. Set the live on entry fields in LIVE. Def's are marked temporarily | |
| 937 in the liveout vector. */ | |
| 938 | |
| 939 static void | |
| 940 set_var_live_on_entry (tree ssa_name, tree_live_info_p live) | |
| 941 { | |
| 942 int p; | |
| 943 gimple stmt; | |
| 944 use_operand_p use; | |
| 945 basic_block def_bb = NULL; | |
| 946 imm_use_iterator imm_iter; | |
| 947 bool global = false; | |
| 948 | |
| 949 p = var_to_partition (live->map, ssa_name); | |
| 950 if (p == NO_PARTITION) | |
| 951 return; | |
| 952 | |
| 953 stmt = SSA_NAME_DEF_STMT (ssa_name); | |
| 954 if (stmt) | |
| 955 { | |
| 956 def_bb = gimple_bb (stmt); | |
| 957 /* Mark defs in liveout bitmap temporarily. */ | |
| 958 if (def_bb) | |
| 959 bitmap_set_bit (live->liveout[def_bb->index], p); | |
| 960 } | |
| 961 else | |
| 962 def_bb = ENTRY_BLOCK_PTR; | |
| 963 | |
| 964 /* Visit each use of SSA_NAME and if it isn't in the same block as the def, | |
| 965 add it to the list of live on entry blocks. */ | |
| 966 FOR_EACH_IMM_USE_FAST (use, imm_iter, ssa_name) | |
| 967 { | |
| 968 gimple use_stmt = USE_STMT (use); | |
| 969 basic_block add_block = NULL; | |
| 970 | |
| 971 if (gimple_code (use_stmt) == GIMPLE_PHI) | |
| 972 { | |
| 973 /* Uses in PHI's are considered to be live at exit of the SRC block | |
| 974 as this is where a copy would be inserted. Check to see if it is | |
| 975 defined in that block, or whether its live on entry. */ | |
| 976 int index = PHI_ARG_INDEX_FROM_USE (use); | |
| 977 edge e = gimple_phi_arg_edge (use_stmt, index); | |
| 978 if (e->src != ENTRY_BLOCK_PTR) | |
| 979 { | |
| 980 if (e->src != def_bb) | |
| 981 add_block = e->src; | |
| 982 } | |
| 983 } | |
|
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984 else if (is_gimple_debug (use_stmt)) |
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985 continue; |
| 0 | 986 else |
| 987 { | |
| 988 /* If its not defined in this block, its live on entry. */ | |
| 989 basic_block use_bb = gimple_bb (use_stmt); | |
| 990 if (use_bb != def_bb) | |
| 991 add_block = use_bb; | |
|
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992 } |
| 0 | 993 |
| 994 /* If there was a live on entry use, set the bit. */ | |
| 995 if (add_block) | |
| 996 { | |
| 997 global = true; | |
| 998 bitmap_set_bit (live->livein[add_block->index], p); | |
| 999 } | |
| 1000 } | |
| 1001 | |
| 1002 /* If SSA_NAME is live on entry to at least one block, fill in all the live | |
| 1003 on entry blocks between the def and all the uses. */ | |
| 1004 if (global) | |
| 1005 bitmap_set_bit (live->global, p); | |
| 1006 } | |
| 1007 | |
| 1008 | |
| 1009 /* Calculate the live on exit vectors based on the entry info in LIVEINFO. */ | |
| 1010 | |
| 1011 void | |
| 1012 calculate_live_on_exit (tree_live_info_p liveinfo) | |
| 1013 { | |
| 1014 basic_block bb; | |
| 1015 edge e; | |
| 1016 edge_iterator ei; | |
| 1017 | |
| 1018 /* live on entry calculations used liveout vectors for defs, clear them. */ | |
| 1019 FOR_EACH_BB (bb) | |
| 1020 bitmap_clear (liveinfo->liveout[bb->index]); | |
| 1021 | |
| 1022 /* Set all the live-on-exit bits for uses in PHIs. */ | |
| 1023 FOR_EACH_BB (bb) | |
| 1024 { | |
| 1025 gimple_stmt_iterator gsi; | |
| 1026 size_t i; | |
| 1027 | |
| 1028 /* Mark the PHI arguments which are live on exit to the pred block. */ | |
| 1029 for (gsi = gsi_start_phis (bb); !gsi_end_p (gsi); gsi_next (&gsi)) | |
| 1030 { | |
| 1031 gimple phi = gsi_stmt (gsi); | |
| 1032 for (i = 0; i < gimple_phi_num_args (phi); i++) | |
|
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1033 { |
| 0 | 1034 tree t = PHI_ARG_DEF (phi, i); |
| 1035 int p; | |
| 1036 | |
| 1037 if (TREE_CODE (t) != SSA_NAME) | |
| 1038 continue; | |
| 1039 | |
| 1040 p = var_to_partition (liveinfo->map, t); | |
| 1041 if (p == NO_PARTITION) | |
| 1042 continue; | |
| 1043 e = gimple_phi_arg_edge (phi, i); | |
| 1044 if (e->src != ENTRY_BLOCK_PTR) | |
| 1045 bitmap_set_bit (liveinfo->liveout[e->src->index], p); | |
| 1046 } | |
| 1047 } | |
| 1048 | |
| 1049 /* Add each successors live on entry to this bock live on exit. */ | |
| 1050 FOR_EACH_EDGE (e, ei, bb->succs) | |
| 1051 if (e->dest != EXIT_BLOCK_PTR) | |
| 1052 bitmap_ior_into (liveinfo->liveout[bb->index], | |
| 1053 live_on_entry (liveinfo, e->dest)); | |
| 1054 } | |
| 1055 } | |
| 1056 | |
| 1057 | |
|
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1058 /* Given partition map MAP, calculate all the live on entry bitmaps for |
| 0 | 1059 each partition. Return a new live info object. */ |
| 1060 | |
|
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1061 tree_live_info_p |
| 0 | 1062 calculate_live_ranges (var_map map) |
| 1063 { | |
| 1064 tree var; | |
| 1065 unsigned i; | |
| 1066 tree_live_info_p live; | |
| 1067 | |
| 1068 live = new_tree_live_info (map); | |
| 1069 for (i = 0; i < num_var_partitions (map); i++) | |
| 1070 { | |
| 1071 var = partition_to_var (map, i); | |
| 1072 if (var != NULL_TREE) | |
| 1073 set_var_live_on_entry (var, live); | |
| 1074 } | |
| 1075 | |
| 1076 live_worklist (live); | |
| 1077 | |
| 1078 #ifdef ENABLE_CHECKING | |
| 1079 verify_live_on_entry (live); | |
| 1080 #endif | |
| 1081 | |
| 1082 calculate_live_on_exit (live); | |
| 1083 return live; | |
| 1084 } | |
| 1085 | |
| 1086 | |
| 1087 /* Output partition map MAP to file F. */ | |
| 1088 | |
| 1089 void | |
| 1090 dump_var_map (FILE *f, var_map map) | |
| 1091 { | |
| 1092 int t; | |
| 1093 unsigned x, y; | |
| 1094 int p; | |
| 1095 | |
| 1096 fprintf (f, "\nPartition map \n\n"); | |
| 1097 | |
| 1098 for (x = 0; x < map->num_partitions; x++) | |
| 1099 { | |
| 1100 if (map->view_to_partition != NULL) | |
| 1101 p = map->view_to_partition[x]; | |
| 1102 else | |
| 1103 p = x; | |
| 1104 | |
|
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1105 if (ssa_name (p) == NULL_TREE) |
| 0 | 1106 continue; |
| 1107 | |
| 1108 t = 0; | |
| 1109 for (y = 1; y < num_ssa_names; y++) | |
| 1110 { | |
| 1111 p = partition_find (map->var_partition, y); | |
| 1112 if (map->partition_to_view) | |
| 1113 p = map->partition_to_view[p]; | |
| 1114 if (p == (int)x) | |
| 1115 { | |
| 1116 if (t++ == 0) | |
| 1117 { | |
| 1118 fprintf(f, "Partition %d (", x); | |
| 1119 print_generic_expr (f, partition_to_var (map, p), TDF_SLIM); | |
| 1120 fprintf (f, " - "); | |
| 1121 } | |
| 1122 fprintf (f, "%d ", y); | |
| 1123 } | |
| 1124 } | |
| 1125 if (t != 0) | |
| 1126 fprintf (f, ")\n"); | |
| 1127 } | |
| 1128 fprintf (f, "\n"); | |
| 1129 } | |
| 1130 | |
| 1131 | |
| 1132 /* Output live range info LIVE to file F, controlled by FLAG. */ | |
| 1133 | |
| 1134 void | |
| 1135 dump_live_info (FILE *f, tree_live_info_p live, int flag) | |
| 1136 { | |
| 1137 basic_block bb; | |
| 1138 unsigned i; | |
| 1139 var_map map = live->map; | |
| 1140 bitmap_iterator bi; | |
| 1141 | |
| 1142 if ((flag & LIVEDUMP_ENTRY) && live->livein) | |
| 1143 { | |
| 1144 FOR_EACH_BB (bb) | |
| 1145 { | |
| 1146 fprintf (f, "\nLive on entry to BB%d : ", bb->index); | |
| 1147 EXECUTE_IF_SET_IN_BITMAP (live->livein[bb->index], 0, i, bi) | |
| 1148 { | |
| 1149 print_generic_expr (f, partition_to_var (map, i), TDF_SLIM); | |
| 1150 fprintf (f, " "); | |
| 1151 } | |
| 1152 fprintf (f, "\n"); | |
| 1153 } | |
| 1154 } | |
| 1155 | |
| 1156 if ((flag & LIVEDUMP_EXIT) && live->liveout) | |
| 1157 { | |
| 1158 FOR_EACH_BB (bb) | |
| 1159 { | |
| 1160 fprintf (f, "\nLive on exit from BB%d : ", bb->index); | |
| 1161 EXECUTE_IF_SET_IN_BITMAP (live->liveout[bb->index], 0, i, bi) | |
| 1162 { | |
| 1163 print_generic_expr (f, partition_to_var (map, i), TDF_SLIM); | |
| 1164 fprintf (f, " "); | |
| 1165 } | |
| 1166 fprintf (f, "\n"); | |
| 1167 } | |
| 1168 } | |
| 1169 } | |
| 1170 | |
| 1171 | |
| 1172 #ifdef ENABLE_CHECKING | |
| 1173 /* Verify that SSA_VAR is a non-virtual SSA_NAME. */ | |
| 1174 | |
| 1175 void | |
| 1176 register_ssa_partition_check (tree ssa_var) | |
| 1177 { | |
| 1178 gcc_assert (TREE_CODE (ssa_var) == SSA_NAME); | |
| 1179 if (!is_gimple_reg (SSA_NAME_VAR (ssa_var))) | |
| 1180 { | |
| 1181 fprintf (stderr, "Illegally registering a virtual SSA name :"); | |
| 1182 print_generic_expr (stderr, ssa_var, TDF_SLIM); | |
| 1183 fprintf (stderr, " in the SSA->Normal phase.\n"); | |
| 1184 internal_error ("SSA corruption"); | |
| 1185 } | |
| 1186 } | |
| 1187 | |
| 1188 | |
| 1189 /* Verify that the info in LIVE matches the current cfg. */ | |
| 1190 | |
| 1191 static void | |
| 1192 verify_live_on_entry (tree_live_info_p live) | |
| 1193 { | |
| 1194 unsigned i; | |
| 1195 tree var; | |
| 1196 gimple stmt; | |
| 1197 basic_block bb; | |
| 1198 edge e; | |
| 1199 int num; | |
| 1200 edge_iterator ei; | |
| 1201 var_map map = live->map; | |
| 1202 | |
| 1203 /* Check for live on entry partitions and report those with a DEF in | |
| 1204 the program. This will typically mean an optimization has done | |
| 1205 something wrong. */ | |
| 1206 bb = ENTRY_BLOCK_PTR; | |
| 1207 num = 0; | |
| 1208 FOR_EACH_EDGE (e, ei, bb->succs) | |
| 1209 { | |
| 1210 int entry_block = e->dest->index; | |
| 1211 if (e->dest == EXIT_BLOCK_PTR) | |
| 1212 continue; | |
| 1213 for (i = 0; i < (unsigned)num_var_partitions (map); i++) | |
| 1214 { | |
| 1215 basic_block tmp; | |
| 1216 tree d; | |
| 1217 bitmap loe; | |
| 1218 var = partition_to_var (map, i); | |
| 1219 stmt = SSA_NAME_DEF_STMT (var); | |
| 1220 tmp = gimple_bb (stmt); | |
| 1221 d = gimple_default_def (cfun, SSA_NAME_VAR (var)); | |
| 1222 | |
| 1223 loe = live_on_entry (live, e->dest); | |
| 1224 if (loe && bitmap_bit_p (loe, i)) | |
| 1225 { | |
| 1226 if (!gimple_nop_p (stmt)) | |
| 1227 { | |
| 1228 num++; | |
| 1229 print_generic_expr (stderr, var, TDF_SLIM); | |
| 1230 fprintf (stderr, " is defined "); | |
| 1231 if (tmp) | |
| 1232 fprintf (stderr, " in BB%d, ", tmp->index); | |
| 1233 fprintf (stderr, "by:\n"); | |
| 1234 print_gimple_stmt (stderr, stmt, 0, TDF_SLIM); | |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
1235 fprintf (stderr, "\nIt is also live-on-entry to entry BB %d", |
| 0 | 1236 entry_block); |
| 1237 fprintf (stderr, " So it appears to have multiple defs.\n"); | |
| 1238 } | |
| 1239 else | |
| 1240 { | |
| 1241 if (d != var) | |
| 1242 { | |
| 1243 num++; | |
| 1244 print_generic_expr (stderr, var, TDF_SLIM); | |
| 1245 fprintf (stderr, " is live-on-entry to BB%d ", | |
| 1246 entry_block); | |
| 1247 if (d) | |
| 1248 { | |
| 1249 fprintf (stderr, " but is not the default def of "); | |
| 1250 print_generic_expr (stderr, d, TDF_SLIM); | |
| 1251 fprintf (stderr, "\n"); | |
| 1252 } | |
| 1253 else | |
| 1254 fprintf (stderr, " and there is no default def.\n"); | |
| 1255 } | |
| 1256 } | |
| 1257 } | |
| 1258 else | |
| 1259 if (d == var) | |
| 1260 { | |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
1261 /* The only way this var shouldn't be marked live on entry is |
| 0 | 1262 if it occurs in a PHI argument of the block. */ |
| 1263 size_t z; | |
| 1264 bool ok = false; | |
| 1265 gimple_stmt_iterator gsi; | |
| 1266 for (gsi = gsi_start_phis (e->dest); | |
| 1267 !gsi_end_p (gsi) && !ok; | |
| 1268 gsi_next (&gsi)) | |
| 1269 { | |
| 1270 gimple phi = gsi_stmt (gsi); | |
| 1271 for (z = 0; z < gimple_phi_num_args (phi); z++) | |
| 1272 if (var == gimple_phi_arg_def (phi, z)) | |
| 1273 { | |
| 1274 ok = true; | |
| 1275 break; | |
| 1276 } | |
| 1277 } | |
| 1278 if (ok) | |
| 1279 continue; | |
| 1280 num++; | |
| 1281 print_generic_expr (stderr, var, TDF_SLIM); | |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
19
diff
changeset
|
1282 fprintf (stderr, " is not marked live-on-entry to entry BB%d ", |
| 0 | 1283 entry_block); |
| 1284 fprintf (stderr, "but it is a default def so it should be.\n"); | |
| 1285 } | |
| 1286 } | |
| 1287 } | |
| 1288 gcc_assert (num <= 0); | |
| 1289 } | |
| 1290 #endif |