Mercurial > hg > CbC > CbC_gcc
annotate gcc/varpool.c @ 141:ce508c72660f
copy cbc flang in cfgexpand
| author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
|---|---|
| date | Thu, 22 Nov 2018 19:44:39 +0900 |
| parents | 84e7813d76e9 |
| children | 1830386684a0 |
| rev | line source |
|---|---|
| 0 | 1 /* Callgraph handling code. |
| 131 | 2 Copyright (C) 2003-2018 Free Software Foundation, Inc. |
| 0 | 3 Contributed by Jan Hubicka |
| 4 | |
| 5 This file is part of GCC. | |
| 6 | |
| 7 GCC is free software; you can redistribute it and/or modify it under | |
| 8 the terms of the GNU General Public License as published by the Free | |
| 9 Software Foundation; either version 3, or (at your option) any later | |
| 10 version. | |
| 11 | |
| 12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
| 13 WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 15 for more details. | |
| 16 | |
| 17 You should have received a copy of the GNU General Public License | |
| 18 along with GCC; see the file COPYING3. If not see | |
| 19 <http://www.gnu.org/licenses/>. */ | |
| 20 | |
| 21 #include "config.h" | |
| 22 #include "system.h" | |
| 23 #include "coretypes.h" | |
| 111 | 24 #include "backend.h" |
| 25 #include "target.h" | |
| 0 | 26 #include "tree.h" |
| 27 #include "gimple.h" | |
| 111 | 28 #include "timevar.h" |
| 29 #include "cgraph.h" | |
| 30 #include "lto-streamer.h" | |
| 31 #include "varasm.h" | |
| 32 #include "debug.h" | |
| 33 #include "output.h" | |
| 34 #include "omp-offload.h" | |
| 35 #include "context.h" | |
| 36 #include "stringpool.h" | |
| 37 #include "attribs.h" | |
| 0 | 38 |
| 111 | 39 const char * const tls_model_names[]={"none", "emulated", |
| 40 "global-dynamic", "local-dynamic", | |
| 41 "initial-exec", "local-exec"}; | |
| 0 | 42 |
| 111 | 43 /* List of hooks triggered on varpool_node events. */ |
| 44 struct varpool_node_hook_list { | |
| 45 varpool_node_hook hook; | |
| 46 void *data; | |
| 47 struct varpool_node_hook_list *next; | |
| 48 }; | |
| 0 | 49 |
| 111 | 50 /* Register HOOK to be called with DATA on each removed node. */ |
| 51 varpool_node_hook_list * | |
| 52 symbol_table::add_varpool_removal_hook (varpool_node_hook hook, void *data) | |
| 53 { | |
| 54 varpool_node_hook_list *entry; | |
| 55 varpool_node_hook_list **ptr = &m_first_varpool_removal_hook; | |
| 0 | 56 |
| 111 | 57 entry = (varpool_node_hook_list *) xmalloc (sizeof (*entry)); |
| 58 entry->hook = hook; | |
| 59 entry->data = data; | |
| 60 entry->next = NULL; | |
| 61 while (*ptr) | |
| 62 ptr = &(*ptr)->next; | |
| 63 *ptr = entry; | |
| 64 return entry; | |
| 65 } | |
| 0 | 66 |
| 111 | 67 /* Remove ENTRY from the list of hooks called on removing nodes. */ |
| 68 void | |
| 69 symbol_table::remove_varpool_removal_hook (varpool_node_hook_list *entry) | |
| 70 { | |
| 71 varpool_node_hook_list **ptr = &m_first_varpool_removal_hook; | |
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72 |
| 111 | 73 while (*ptr != entry) |
| 74 ptr = &(*ptr)->next; | |
| 75 *ptr = entry->next; | |
| 76 free (entry); | |
| 77 } | |
| 0 | 78 |
| 111 | 79 /* Call all node removal hooks. */ |
| 80 void | |
| 81 symbol_table::call_varpool_removal_hooks (varpool_node *node) | |
| 0 | 82 { |
| 111 | 83 varpool_node_hook_list *entry = m_first_varpool_removal_hook; |
| 84 while (entry) | |
| 85 { | |
| 86 entry->hook (node, entry->data); | |
| 87 entry = entry->next; | |
| 88 } | |
| 0 | 89 } |
| 90 | |
| 111 | 91 /* Register HOOK to be called with DATA on each inserted node. */ |
| 92 varpool_node_hook_list * | |
| 93 symbol_table::add_varpool_insertion_hook (varpool_node_hook hook, void *data) | |
| 0 | 94 { |
| 111 | 95 varpool_node_hook_list *entry; |
| 96 varpool_node_hook_list **ptr = &m_first_varpool_insertion_hook; | |
| 97 | |
| 98 entry = (varpool_node_hook_list *) xmalloc (sizeof (*entry)); | |
| 99 entry->hook = hook; | |
| 100 entry->data = data; | |
| 101 entry->next = NULL; | |
| 102 while (*ptr) | |
| 103 ptr = &(*ptr)->next; | |
| 104 *ptr = entry; | |
| 105 return entry; | |
| 0 | 106 } |
| 107 | |
| 111 | 108 /* Remove ENTRY from the list of hooks called on inserted nodes. */ |
| 109 void | |
| 110 symbol_table::remove_varpool_insertion_hook (varpool_node_hook_list *entry) | |
| 0 | 111 { |
| 111 | 112 varpool_node_hook_list **ptr = &m_first_varpool_insertion_hook; |
| 113 | |
| 114 while (*ptr != entry) | |
| 115 ptr = &(*ptr)->next; | |
| 116 *ptr = entry->next; | |
| 117 free (entry); | |
| 0 | 118 } |
| 119 | |
| 111 | 120 /* Call all node insertion hooks. */ |
| 121 void | |
| 122 symbol_table::call_varpool_insertion_hooks (varpool_node *node) | |
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123 { |
| 111 | 124 varpool_node_hook_list *entry = m_first_varpool_insertion_hook; |
| 125 while (entry) | |
| 126 { | |
| 127 entry->hook (node, entry->data); | |
| 128 entry = entry->next; | |
| 129 } | |
| 130 } | |
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131 |
| 111 | 132 /* Allocate new callgraph node and insert it into basic data structures. */ |
| 133 | |
| 134 varpool_node * | |
| 135 varpool_node::create_empty (void) | |
| 136 { | |
| 137 varpool_node *node = ggc_cleared_alloc<varpool_node> (); | |
| 138 node->type = SYMTAB_VARIABLE; | |
| 139 return node; | |
| 140 } | |
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141 |
| 0 | 142 /* Return varpool node assigned to DECL. Create new one when needed. */ |
| 111 | 143 varpool_node * |
| 144 varpool_node::get_create (tree decl) | |
| 0 | 145 { |
| 111 | 146 varpool_node *node = varpool_node::get (decl); |
| 147 gcc_checking_assert (VAR_P (decl)); | |
| 148 if (node) | |
| 149 return node; | |
| 0 | 150 |
| 111 | 151 node = varpool_node::create_empty (); |
| 152 node->decl = decl; | |
| 0 | 153 |
| 111 | 154 if ((flag_openacc || flag_openmp) |
| 155 && lookup_attribute ("omp declare target", DECL_ATTRIBUTES (decl))) | |
| 156 { | |
| 157 node->offloadable = 1; | |
| 158 if (ENABLE_OFFLOADING && !DECL_EXTERNAL (decl)) | |
| 159 { | |
| 160 g->have_offload = true; | |
| 161 if (!in_lto_p) | |
| 162 vec_safe_push (offload_vars, decl); | |
| 163 } | |
| 164 } | |
| 165 | |
| 166 node->register_symbol (); | |
| 0 | 167 return node; |
| 168 } | |
| 169 | |
| 111 | 170 /* Remove variable from symbol table. */ |
| 171 | |
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172 void |
| 111 | 173 varpool_node::remove (void) |
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174 { |
| 111 | 175 symtab->call_varpool_removal_hooks (this); |
| 176 if (lto_file_data) | |
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177 { |
| 111 | 178 lto_free_function_in_decl_state_for_node (this); |
| 179 lto_file_data = NULL; | |
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180 } |
| 111 | 181 |
| 182 /* When streaming we can have multiple nodes associated with decl. */ | |
| 183 if (symtab->state == LTO_STREAMING) | |
| 184 ; | |
| 185 /* Keep constructor when it may be used for folding. We remove | |
| 186 references to external variables before final compilation. */ | |
| 187 else if (DECL_INITIAL (decl) && DECL_INITIAL (decl) != error_mark_node | |
| 188 && !ctor_useable_for_folding_p ()) | |
| 189 remove_initializer (); | |
| 190 | |
| 191 unregister (); | |
| 192 ggc_free (this); | |
| 193 } | |
| 194 | |
| 195 /* Remove node initializer when it is no longer needed. */ | |
| 196 void | |
| 197 varpool_node::remove_initializer (void) | |
| 198 { | |
| 199 if (DECL_INITIAL (decl) | |
| 200 && !DECL_IN_CONSTANT_POOL (decl) | |
| 201 /* Keep vtables for BINFO folding. */ | |
| 202 && !DECL_VIRTUAL_P (decl) | |
| 203 /* FIXME: http://gcc.gnu.org/PR55395 */ | |
| 204 && debug_info_level == DINFO_LEVEL_NONE | |
| 205 /* When doing declaration merging we have duplicate | |
| 206 entries for given decl. Do not attempt to remove | |
| 207 the boides, or we will end up remiving | |
| 208 wrong one. */ | |
| 209 && symtab->state != LTO_STREAMING) | |
| 210 DECL_INITIAL (decl) = error_mark_node; | |
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211 } |
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212 |
| 111 | 213 /* Dump given varpool node to F. */ |
| 0 | 214 void |
| 111 | 215 varpool_node::dump (FILE *f) |
| 0 | 216 { |
| 111 | 217 dump_base (f); |
| 218 fprintf (f, " Availability: %s\n", | |
| 219 symtab->function_flags_ready | |
| 220 ? cgraph_availability_names[get_availability ()] | |
| 0 | 221 : "not-ready"); |
| 111 | 222 fprintf (f, " Varpool flags:"); |
| 223 if (DECL_INITIAL (decl)) | |
| 0 | 224 fprintf (f, " initialized"); |
| 111 | 225 if (output) |
| 0 | 226 fprintf (f, " output"); |
| 111 | 227 if (used_by_single_function) |
| 228 fprintf (f, " used-by-single-function"); | |
| 229 if (need_bounds_init) | |
| 230 fprintf (f, " need-bounds-init"); | |
| 231 if (TREE_READONLY (decl)) | |
| 232 fprintf (f, " read-only"); | |
| 233 if (ctor_useable_for_folding_p ()) | |
| 234 fprintf (f, " const-value-known"); | |
| 235 if (writeonly) | |
| 236 fprintf (f, " write-only"); | |
| 237 if (tls_model) | |
| 238 fprintf (f, " tls-%s", tls_model_names [tls_model]); | |
| 0 | 239 fprintf (f, "\n"); |
| 240 } | |
| 241 | |
| 111 | 242 |
| 243 /* Dump given varpool node to stderr. */ | |
| 244 void varpool_node::debug (void) | |
| 245 { | |
| 246 varpool_node::dump (stderr); | |
| 247 } | |
| 248 | |
| 249 /* Dump the variable pool to F. */ | |
| 0 | 250 void |
| 111 | 251 varpool_node::dump_varpool (FILE *f) |
| 0 | 252 { |
| 111 | 253 varpool_node *node; |
| 0 | 254 |
| 255 fprintf (f, "variable pool:\n\n"); | |
| 111 | 256 FOR_EACH_VARIABLE (node) |
| 257 node->dump (f); | |
| 0 | 258 } |
| 259 | |
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260 /* Dump the variable pool to stderr. */ |
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261 |
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262 DEBUG_FUNCTION void |
| 111 | 263 varpool_node::debug_varpool (void) |
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264 { |
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265 dump_varpool (stderr); |
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266 } |
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267 |
| 0 | 268 /* Given an assembler name, lookup node. */ |
| 111 | 269 varpool_node * |
| 270 varpool_node::get_for_asmname (tree asmname) | |
| 0 | 271 { |
| 111 | 272 if (symtab_node *node = symtab_node::get_for_asmname (asmname)) |
| 273 return dyn_cast <varpool_node *> (node); | |
| 274 else | |
| 275 return NULL; | |
| 0 | 276 } |
| 277 | |
| 111 | 278 /* When doing LTO, read variable's constructor from disk if |
| 279 it is not already present. */ | |
| 280 | |
| 281 tree | |
| 282 varpool_node::get_constructor (void) | |
| 0 | 283 { |
| 111 | 284 lto_file_decl_data *file_data; |
| 285 const char *data, *name; | |
| 286 size_t len; | |
| 287 | |
| 288 if (DECL_INITIAL (decl) != error_mark_node | |
| 289 || !in_lto_p | |
| 290 || !lto_file_data) | |
| 291 return DECL_INITIAL (decl); | |
| 292 | |
| 293 timevar_push (TV_IPA_LTO_CTORS_IN); | |
| 294 | |
| 295 file_data = lto_file_data; | |
| 296 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)); | |
| 297 | |
| 298 /* We may have renamed the declaration, e.g., a static function. */ | |
| 299 name = lto_get_decl_name_mapping (file_data, name); | |
| 300 struct lto_in_decl_state *decl_state | |
| 301 = lto_get_function_in_decl_state (file_data, decl); | |
| 302 | |
| 303 data = lto_get_section_data (file_data, LTO_section_function_body, | |
| 304 name, &len, decl_state->compressed); | |
| 305 if (!data) | |
| 306 fatal_error (input_location, "%s: section %s is missing", | |
| 307 file_data->file_name, | |
| 308 name); | |
| 309 | |
| 131 | 310 if (!quiet_flag) |
| 311 fprintf (stderr, " in:%s", IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl))); | |
| 111 | 312 lto_input_variable_constructor (file_data, this, data); |
| 313 gcc_assert (DECL_INITIAL (decl) != error_mark_node); | |
| 314 lto_stats.num_function_bodies++; | |
| 315 lto_free_section_data (file_data, LTO_section_function_body, name, | |
| 316 data, len, decl_state->compressed); | |
| 317 lto_free_function_in_decl_state_for_node (this); | |
| 318 timevar_pop (TV_IPA_LTO_CTORS_IN); | |
| 319 return DECL_INITIAL (decl); | |
| 0 | 320 } |
| 321 | |
| 111 | 322 /* Return true if variable has constructor that can be used for folding. */ |
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323 |
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324 bool |
| 111 | 325 varpool_node::ctor_useable_for_folding_p (void) |
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326 { |
| 111 | 327 varpool_node *real_node = this; |
| 328 | |
| 329 if (real_node->alias && real_node->definition) | |
| 330 real_node = ultimate_alias_target (); | |
| 0 | 331 |
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332 if (TREE_CODE (decl) == CONST_DECL |
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333 || DECL_IN_CONSTANT_POOL (decl)) |
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334 return true; |
| 111 | 335 if (TREE_THIS_VOLATILE (decl)) |
| 336 return false; | |
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337 |
| 111 | 338 /* If we do not have a constructor, we can't use it. */ |
| 339 if (DECL_INITIAL (real_node->decl) == error_mark_node | |
| 340 && !real_node->lto_file_data) | |
| 341 return false; | |
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342 |
| 111 | 343 /* Avoid attempts to load constructors that was not streamed. */ |
| 344 if (flag_ltrans && DECL_INITIAL (real_node->decl) == error_mark_node | |
| 345 && real_node->body_removed) | |
| 0 | 346 return false; |
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347 |
| 111 | 348 /* Vtables are defined by their types and must match no matter of interposition |
| 349 rules. */ | |
| 350 if (DECL_VIRTUAL_P (decl)) | |
| 351 { | |
| 352 /* The C++ front end creates VAR_DECLs for vtables of typeinfo | |
| 353 classes not defined in the current TU so that it can refer | |
| 354 to them from typeinfo objects. Avoid returning NULL_TREE. */ | |
| 355 return DECL_INITIAL (real_node->decl) != NULL; | |
| 356 } | |
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357 |
| 111 | 358 /* Alias of readonly variable is also readonly, since the variable is stored |
| 359 in readonly memory. We also accept readonly aliases of non-readonly | |
| 360 locations assuming that user knows what he is asking for. */ | |
| 361 if (!TREE_READONLY (decl) && !TREE_READONLY (real_node->decl)) | |
| 362 return false; | |
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363 |
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364 /* Variables declared 'const' without an initializer |
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365 have zero as the initializer if they may not be |
| 111 | 366 overridden at link or run time. |
| 367 | |
| 368 It is actually requirement for C++ compiler to optimize const variables | |
| 369 consistently. As a GNU extension, do not enfore this rule for user defined | |
| 370 weak variables, so we support interposition on: | |
| 371 static const int dummy = 0; | |
| 372 extern const int foo __attribute__((__weak__, __alias__("dummy"))); | |
| 373 */ | |
| 374 if ((!DECL_INITIAL (real_node->decl) | |
| 375 || (DECL_WEAK (decl) && !DECL_COMDAT (decl))) | |
| 376 && (DECL_EXTERNAL (decl) || decl_replaceable_p (decl))) | |
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377 return false; |
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378 |
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379 /* Variables declared `const' with an initializer are considered |
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380 to not be overwritable with different initializer by default. |
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381 |
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382 ??? Previously we behaved so for scalar variables but not for array |
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383 accesses. */ |
| 0 | 384 return true; |
| 385 } | |
| 386 | |
| 111 | 387 /* If DECLARATION is constant variable and its initial value is known |
| 388 (so we can do constant folding), return its constructor (DECL_INITIAL). | |
| 389 This may be an expression or NULL when DECL is initialized to 0. | |
| 390 Return ERROR_MARK_NODE otherwise. | |
| 391 | |
| 392 In LTO this may actually trigger reading the constructor from disk. | |
| 393 For this reason varpool_ctor_useable_for_folding_p should be used when | |
| 394 the actual constructor value is not needed. */ | |
| 395 | |
| 396 tree | |
| 397 ctor_for_folding (tree decl) | |
| 0 | 398 { |
| 111 | 399 varpool_node *node, *real_node; |
| 400 tree real_decl; | |
| 401 | |
| 402 if (!VAR_P (decl) && TREE_CODE (decl) != CONST_DECL) | |
| 403 return error_mark_node; | |
| 404 | |
| 405 if (TREE_CODE (decl) == CONST_DECL | |
| 406 || DECL_IN_CONSTANT_POOL (decl)) | |
| 407 return DECL_INITIAL (decl); | |
| 408 | |
| 409 if (TREE_THIS_VOLATILE (decl)) | |
| 410 return error_mark_node; | |
| 411 | |
| 412 /* Do not care about automatic variables. Those are never initialized | |
| 413 anyway, because gimplifier exapnds the code. */ | |
| 414 if (!TREE_STATIC (decl) && !DECL_EXTERNAL (decl)) | |
| 415 { | |
| 416 gcc_assert (!TREE_PUBLIC (decl)); | |
| 417 return error_mark_node; | |
| 418 } | |
| 419 | |
| 420 gcc_assert (VAR_P (decl)); | |
|
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421 |
| 111 | 422 real_node = node = varpool_node::get (decl); |
| 423 if (node) | |
| 0 | 424 { |
| 111 | 425 real_node = node->ultimate_alias_target (); |
| 426 real_decl = real_node->decl; | |
| 427 } | |
| 428 else | |
| 429 real_decl = decl; | |
| 430 | |
| 431 /* See if we are dealing with alias. | |
| 432 In most cases alias is just alternative symbol pointing to a given | |
| 433 constructor. This allows us to use interposition rules of DECL | |
| 434 constructor of REAL_NODE. However weakrefs are special by being just | |
| 435 alternative name of their target (if defined). */ | |
| 436 if (decl != real_decl) | |
| 437 { | |
| 438 gcc_assert (!DECL_INITIAL (decl) | |
| 439 || (node->alias && node->get_alias_target () == real_node) | |
| 440 || DECL_INITIAL (decl) == error_mark_node); | |
| 441 while (node->transparent_alias && node->analyzed) | |
| 442 { | |
| 443 node = node->get_alias_target (); | |
| 444 decl = node->decl; | |
| 445 } | |
| 0 | 446 } |
| 111 | 447 |
| 448 if ((!DECL_VIRTUAL_P (real_decl) | |
| 449 || DECL_INITIAL (real_decl) == error_mark_node | |
| 450 || !DECL_INITIAL (real_decl)) | |
| 451 && (!node || !node->ctor_useable_for_folding_p ())) | |
| 452 return error_mark_node; | |
| 453 | |
| 454 /* OK, we can return constructor. See if we need to fetch it from disk | |
| 455 in LTO mode. */ | |
| 456 if (DECL_INITIAL (real_decl) != error_mark_node | |
| 457 || !in_lto_p) | |
| 458 return DECL_INITIAL (real_decl); | |
| 459 return real_node->get_constructor (); | |
| 460 } | |
| 0 | 461 |
| 111 | 462 /* Add the variable DECL to the varpool. |
| 463 Unlike finalize_decl function is intended to be used | |
| 464 by middle end and allows insertion of new variable at arbitrary point | |
| 465 of compilation. */ | |
| 466 void | |
| 467 varpool_node::add (tree decl) | |
| 468 { | |
| 469 varpool_node *node; | |
| 470 varpool_node::finalize_decl (decl); | |
| 471 node = varpool_node::get_create (decl); | |
| 472 symtab->call_varpool_insertion_hooks (node); | |
| 473 if (node->externally_visible_p ()) | |
| 474 node->externally_visible = true; | |
| 475 if (lookup_attribute ("no_reorder", DECL_ATTRIBUTES (decl))) | |
| 476 node->no_reorder = 1; | |
| 0 | 477 } |
| 478 | |
| 479 /* Return variable availability. See cgraph.h for description of individual | |
| 480 return values. */ | |
| 481 enum availability | |
| 111 | 482 varpool_node::get_availability (symtab_node *ref) |
| 0 | 483 { |
| 111 | 484 if (!definition) |
| 0 | 485 return AVAIL_NOT_AVAILABLE; |
| 111 | 486 if (!TREE_PUBLIC (decl)) |
| 487 return AVAIL_AVAILABLE; | |
| 488 if (DECL_IN_CONSTANT_POOL (decl) | |
| 489 || DECL_VIRTUAL_P (decl)) | |
| 490 return AVAIL_AVAILABLE; | |
| 491 if (transparent_alias && definition) | |
| 492 { | |
| 493 enum availability avail; | |
| 494 | |
| 495 ultimate_alias_target (&avail, ref); | |
| 496 return avail; | |
| 497 } | |
| 498 /* If this is a reference from symbol itself and there are no aliases, we | |
| 499 may be sure that the symbol was not interposed by something else because | |
| 500 the symbol itself would be unreachable otherwise. */ | |
| 501 if ((this == ref && !has_aliases_p ()) | |
| 502 || (ref && get_comdat_group () | |
| 503 && get_comdat_group () == ref->get_comdat_group ())) | |
| 0 | 504 return AVAIL_AVAILABLE; |
| 505 /* If the variable can be overwritten, return OVERWRITABLE. Takes | |
| 111 | 506 care of at least one notable extension - the COMDAT variables |
| 0 | 507 used to share template instantiations in C++. */ |
| 111 | 508 if (decl_replaceable_p (decl) |
| 509 || DECL_EXTERNAL (decl)) | |
| 510 return AVAIL_INTERPOSABLE; | |
| 0 | 511 return AVAIL_AVAILABLE; |
| 512 } | |
| 513 | |
| 111 | 514 void |
| 515 varpool_node::analyze (void) | |
| 0 | 516 { |
| 111 | 517 /* When reading back varpool at LTO time, we re-construct the queue in order |
| 518 to have "needed" list right by inserting all needed nodes into varpool. | |
| 519 We however don't want to re-analyze already analyzed nodes. */ | |
| 520 if (!analyzed) | |
| 0 | 521 { |
| 111 | 522 gcc_assert (!in_lto_p || symtab->function_flags_ready); |
| 523 /* Compute the alignment early so function body expanders are | |
| 524 already informed about increased alignment. */ | |
| 525 align_variable (decl, 0); | |
| 526 } | |
| 527 if (alias) | |
| 528 resolve_alias (varpool_node::get (alias_target)); | |
| 529 else if (DECL_INITIAL (decl)) | |
| 530 record_references_in_initializer (decl, analyzed); | |
| 531 analyzed = true; | |
| 532 } | |
| 0 | 533 |
| 111 | 534 /* Assemble thunks and aliases associated to varpool node. */ |
| 535 | |
| 536 void | |
| 537 varpool_node::assemble_aliases (void) | |
| 538 { | |
| 539 ipa_ref *ref; | |
| 540 | |
| 541 FOR_EACH_ALIAS (this, ref) | |
| 542 { | |
| 543 varpool_node *alias = dyn_cast <varpool_node *> (ref->referring); | |
| 544 if (!alias->transparent_alias) | |
| 545 do_assemble_alias (alias->decl, | |
| 546 DECL_ASSEMBLER_NAME (decl)); | |
| 547 alias->assemble_aliases (); | |
| 0 | 548 } |
| 549 } | |
| 550 | |
| 551 /* Output one variable, if necessary. Return whether we output it. */ | |
| 111 | 552 |
| 0 | 553 bool |
| 111 | 554 varpool_node::assemble_decl (void) |
| 0 | 555 { |
| 111 | 556 /* Aliases are outout when their target is produced or by |
| 557 output_weakrefs. */ | |
| 558 if (alias) | |
| 559 return false; | |
| 0 | 560 |
| 111 | 561 /* Constant pool is output from RTL land when the reference |
| 562 survive till this level. */ | |
| 563 if (DECL_IN_CONSTANT_POOL (decl) && TREE_ASM_WRITTEN (decl)) | |
| 564 return false; | |
| 565 | |
| 566 /* Decls with VALUE_EXPR should not be in the varpool at all. They | |
| 567 are not real variables, but just info for debugging and codegen. | |
| 568 Unfortunately at the moment emutls is not updating varpool correctly | |
| 569 after turning real vars into value_expr vars. */ | |
| 570 if (DECL_HAS_VALUE_EXPR_P (decl) | |
| 571 && !targetm.have_tls) | |
| 572 return false; | |
|
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573 |
| 111 | 574 /* Hard register vars do not need to be output. */ |
| 575 if (DECL_HARD_REGISTER (decl)) | |
| 576 return false; | |
| 577 | |
| 578 gcc_checking_assert (!TREE_ASM_WRITTEN (decl) | |
| 579 && VAR_P (decl) | |
| 580 && !DECL_HAS_VALUE_EXPR_P (decl)); | |
|
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581 |
| 111 | 582 if (!in_other_partition |
| 583 && !DECL_EXTERNAL (decl)) | |
| 584 { | |
| 585 get_constructor (); | |
| 586 assemble_variable (decl, 0, 1, 0); | |
| 587 gcc_assert (TREE_ASM_WRITTEN (decl)); | |
| 588 gcc_assert (definition); | |
| 589 assemble_aliases (); | |
| 590 /* After the parser has generated debugging information, augment | |
| 591 this information with any new location/etc information that may | |
| 592 have become available after the compilation proper. */ | |
| 593 debug_hooks->late_global_decl (decl); | |
| 594 return true; | |
| 0 | 595 } |
| 596 | |
| 597 return false; | |
| 598 } | |
| 599 | |
| 111 | 600 /* Add NODE to queue starting at FIRST. |
| 601 The queue is linked via AUX pointers and terminated by pointer to 1. */ | |
| 602 | |
| 603 static void | |
| 604 enqueue_node (varpool_node *node, varpool_node **first) | |
| 605 { | |
| 606 if (node->aux) | |
| 607 return; | |
| 608 gcc_checking_assert (*first); | |
| 609 node->aux = *first; | |
| 610 *first = node; | |
| 611 } | |
| 0 | 612 |
| 111 | 613 /* Optimization of function bodies might've rendered some variables as |
| 614 unnecessary so we want to avoid these from being compiled. Re-do | |
| 615 reachability starting from variables that are either externally visible | |
| 616 or was referred from the asm output routines. */ | |
| 617 | |
| 0 | 618 void |
| 111 | 619 symbol_table::remove_unreferenced_decls (void) |
| 0 | 620 { |
| 111 | 621 varpool_node *next, *node; |
| 622 varpool_node *first = (varpool_node *)(void *)1; | |
| 623 int i; | |
| 624 ipa_ref *ref = NULL; | |
| 625 hash_set<varpool_node *> referenced; | |
| 0 | 626 |
|
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627 if (seen_error ()) |
| 0 | 628 return; |
| 629 | |
| 111 | 630 if (dump_file) |
| 631 fprintf (dump_file, "Trivially needed variables:"); | |
| 632 FOR_EACH_DEFINED_VARIABLE (node) | |
| 0 | 633 { |
|
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634 if (node->analyzed |
| 111 | 635 && (!node->can_remove_if_no_refs_p () |
|
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636 /* We just expanded all function bodies. See if any of |
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637 them needed the variable. */ |
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638 || DECL_RTL_SET_P (node->decl))) |
| 111 | 639 { |
| 640 enqueue_node (node, &first); | |
| 641 if (dump_file) | |
| 642 fprintf (dump_file, " %s", node->asm_name ()); | |
| 643 } | |
| 0 | 644 } |
| 111 | 645 while (first != (varpool_node *)(void *)1) |
| 646 { | |
| 647 node = first; | |
| 648 first = (varpool_node *)first->aux; | |
| 649 | |
| 650 if (node->same_comdat_group) | |
| 651 { | |
| 652 symtab_node *next; | |
| 653 for (next = node->same_comdat_group; | |
| 654 next != node; | |
| 655 next = next->same_comdat_group) | |
| 656 { | |
| 657 varpool_node *vnext = dyn_cast <varpool_node *> (next); | |
| 658 if (vnext && vnext->analyzed && !next->comdat_local_p ()) | |
| 659 enqueue_node (vnext, &first); | |
| 660 } | |
| 661 } | |
| 662 for (i = 0; node->iterate_reference (i, ref); i++) | |
| 663 { | |
| 664 varpool_node *vnode = dyn_cast <varpool_node *> (ref->referred); | |
| 665 if (vnode | |
| 666 && !vnode->in_other_partition | |
| 667 && (!DECL_EXTERNAL (ref->referred->decl) | |
| 668 || vnode->alias) | |
| 669 && vnode->analyzed) | |
| 670 enqueue_node (vnode, &first); | |
| 671 else | |
| 672 { | |
| 673 referenced.add (vnode); | |
| 674 while (vnode && vnode->alias && vnode->definition) | |
| 675 { | |
| 676 vnode = vnode->get_alias_target (); | |
| 677 referenced.add (vnode); | |
| 678 } | |
| 679 } | |
| 680 } | |
| 681 } | |
| 682 if (dump_file) | |
| 683 fprintf (dump_file, "\nRemoving variables:"); | |
| 684 for (node = first_defined_variable (); node; node = next) | |
| 685 { | |
| 686 next = next_defined_variable (node); | |
| 687 if (!node->aux && !node->no_reorder) | |
| 688 { | |
| 689 if (dump_file) | |
| 690 fprintf (dump_file, " %s", node->asm_name ()); | |
| 691 if (referenced.contains(node)) | |
| 692 node->remove_initializer (); | |
| 693 else | |
| 694 node->remove (); | |
| 695 } | |
| 696 } | |
| 697 | |
| 698 if (dump_file) | |
| 699 fprintf (dump_file, "\n"); | |
| 0 | 700 } |
| 701 | |
|
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702 /* For variables in named sections make sure get_variable_section |
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703 is called before we switch to those sections. Then section |
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704 conflicts between read-only and read-only requiring relocations |
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705 sections can be resolved. */ |
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706 void |
| 111 | 707 varpool_node::finalize_named_section_flags (void) |
|
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708 { |
| 111 | 709 if (!TREE_ASM_WRITTEN (decl) |
| 710 && !alias | |
| 711 && !in_other_partition | |
| 712 && !DECL_EXTERNAL (decl) | |
| 713 && VAR_P (decl) | |
| 714 && !DECL_HAS_VALUE_EXPR_P (decl) | |
| 715 && get_section ()) | |
| 716 get_variable_section (decl, false); | |
|
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717 } |
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718 |
| 0 | 719 /* Output all variables enqueued to be assembled. */ |
| 720 bool | |
| 111 | 721 symbol_table::output_variables (void) |
| 0 | 722 { |
| 723 bool changed = false; | |
| 111 | 724 varpool_node *node; |
| 0 | 725 |
|
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726 if (seen_error ()) |
| 0 | 727 return false; |
| 728 | |
| 111 | 729 remove_unreferenced_decls (); |
| 730 | |
|
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731 timevar_push (TV_VAROUT); |
| 0 | 732 |
| 111 | 733 FOR_EACH_DEFINED_VARIABLE (node) |
| 734 { | |
| 735 /* Handled in output_in_order. */ | |
| 736 if (node->no_reorder) | |
| 737 continue; | |
|
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738 |
| 111 | 739 node->finalize_named_section_flags (); |
| 740 } | |
| 0 | 741 |
| 111 | 742 /* There is a similar loop in output_in_order. Please keep them in sync. */ |
| 743 FOR_EACH_VARIABLE (node) | |
| 744 { | |
| 745 /* Handled in output_in_order. */ | |
| 746 if (node->no_reorder) | |
| 747 continue; | |
| 748 if (DECL_HARD_REGISTER (node->decl) | |
| 749 || DECL_HAS_VALUE_EXPR_P (node->decl)) | |
| 750 continue; | |
| 751 if (node->definition) | |
| 752 changed |= node->assemble_decl (); | |
| 0 | 753 else |
| 111 | 754 assemble_undefined_decl (node->decl); |
| 0 | 755 } |
|
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756 timevar_pop (TV_VAROUT); |
| 0 | 757 return changed; |
| 758 } | |
| 759 | |
|
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760 /* Attempt to mark ALIAS as an alias to DECL. Return TRUE if successful. |
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761 Extra name aliases are output whenever DECL is output. */ |
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762 |
| 111 | 763 varpool_node * |
| 764 varpool_node::create_alias (tree alias, tree decl) | |
|
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765 { |
| 111 | 766 varpool_node *alias_node; |
|
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767 |
| 111 | 768 gcc_assert (VAR_P (decl)); |
| 769 gcc_assert (VAR_P (alias)); | |
| 770 alias_node = varpool_node::get_create (alias); | |
| 771 alias_node->alias = true; | |
| 772 alias_node->definition = true; | |
| 773 alias_node->alias_target = decl; | |
| 774 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (alias)) != NULL) | |
| 775 alias_node->weakref = alias_node->transparent_alias = true; | |
|
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776 return alias_node; |
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777 } |
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778 |
| 111 | 779 /* Attempt to mark ALIAS as an alias to DECL. Return TRUE if successful. |
| 780 Extra name aliases are output whenever DECL is output. */ | |
| 781 | |
| 782 varpool_node * | |
| 783 varpool_node::create_extra_name_alias (tree alias, tree decl) | |
| 784 { | |
| 785 varpool_node *alias_node; | |
| 786 | |
| 787 /* If aliases aren't supported by the assembler, fail. */ | |
| 788 if (!TARGET_SUPPORTS_ALIASES) | |
| 789 return NULL; | |
| 790 | |
| 791 alias_node = varpool_node::create_alias (alias, decl); | |
| 792 alias_node->cpp_implicit_alias = true; | |
| 793 | |
| 794 /* Extra name alias mechanizm creates aliases really late | |
| 795 via DECL_ASSEMBLER_NAME mechanizm. | |
| 796 This is unfortunate because they are not going through the | |
| 797 standard channels. Ensure they get output. */ | |
| 798 if (symtab->cpp_implicit_aliases_done) | |
| 799 alias_node->resolve_alias (varpool_node::get_create (decl)); | |
| 800 return alias_node; | |
| 801 } | |
| 802 | |
| 803 /* Worker for call_for_symbol_and_aliases. */ | |
|
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update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
804 |
|
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
805 bool |
| 111 | 806 varpool_node::call_for_symbol_and_aliases_1 (bool (*callback) (varpool_node *, |
| 807 void *), | |
| 808 void *data, | |
| 809 bool include_overwritable) | |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
810 { |
| 111 | 811 ipa_ref *ref; |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
812 |
| 111 | 813 FOR_EACH_ALIAS (this, ref) |
| 814 { | |
| 815 varpool_node *alias = dyn_cast <varpool_node *> (ref->referring); | |
| 816 if (include_overwritable | |
| 817 || alias->get_availability () > AVAIL_INTERPOSABLE) | |
| 818 if (alias->call_for_symbol_and_aliases (callback, data, | |
| 819 include_overwritable)) | |
| 820 return true; | |
| 821 } | |
|
67
f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
63
diff
changeset
|
822 return false; |
|
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
823 } |