Mercurial > hg > CbC > CbC_gcc
annotate gcc/varpool.c @ 158:494b0b89df80 default tip
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| author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
|---|---|
| date | Mon, 25 May 2020 18:13:55 +0900 |
| parents | 1830386684a0 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* Callgraph handling code. |
| 145 | 2 Copyright (C) 2003-2020 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) | |
| 145 | 136 { |
| 137 return new (ggc_alloc<varpool_node> ()) varpool_node (); | |
| 111 | 138 } |
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139 |
| 0 | 140 /* Return varpool node assigned to DECL. Create new one when needed. */ |
| 111 | 141 varpool_node * |
| 142 varpool_node::get_create (tree decl) | |
| 0 | 143 { |
| 111 | 144 varpool_node *node = varpool_node::get (decl); |
| 145 gcc_checking_assert (VAR_P (decl)); | |
| 146 if (node) | |
| 147 return node; | |
| 0 | 148 |
| 111 | 149 node = varpool_node::create_empty (); |
| 150 node->decl = decl; | |
| 0 | 151 |
| 111 | 152 if ((flag_openacc || flag_openmp) |
| 153 && lookup_attribute ("omp declare target", DECL_ATTRIBUTES (decl))) | |
| 154 { | |
| 155 node->offloadable = 1; | |
| 156 if (ENABLE_OFFLOADING && !DECL_EXTERNAL (decl)) | |
| 157 { | |
| 158 g->have_offload = true; | |
| 159 if (!in_lto_p) | |
| 160 vec_safe_push (offload_vars, decl); | |
| 161 } | |
| 162 } | |
| 163 | |
| 164 node->register_symbol (); | |
| 0 | 165 return node; |
| 166 } | |
| 167 | |
| 111 | 168 /* Remove variable from symbol table. */ |
| 169 | |
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170 void |
| 111 | 171 varpool_node::remove (void) |
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172 { |
| 111 | 173 symtab->call_varpool_removal_hooks (this); |
| 174 if (lto_file_data) | |
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175 { |
| 111 | 176 lto_free_function_in_decl_state_for_node (this); |
| 177 lto_file_data = NULL; | |
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178 } |
| 111 | 179 |
| 180 /* When streaming we can have multiple nodes associated with decl. */ | |
| 181 if (symtab->state == LTO_STREAMING) | |
| 182 ; | |
| 183 /* Keep constructor when it may be used for folding. We remove | |
| 184 references to external variables before final compilation. */ | |
| 185 else if (DECL_INITIAL (decl) && DECL_INITIAL (decl) != error_mark_node | |
| 186 && !ctor_useable_for_folding_p ()) | |
| 187 remove_initializer (); | |
| 188 | |
| 189 unregister (); | |
| 190 ggc_free (this); | |
| 191 } | |
| 192 | |
| 193 /* Remove node initializer when it is no longer needed. */ | |
| 194 void | |
| 195 varpool_node::remove_initializer (void) | |
| 196 { | |
| 197 if (DECL_INITIAL (decl) | |
| 198 && !DECL_IN_CONSTANT_POOL (decl) | |
| 199 /* Keep vtables for BINFO folding. */ | |
| 200 && !DECL_VIRTUAL_P (decl) | |
| 201 /* FIXME: http://gcc.gnu.org/PR55395 */ | |
| 202 && debug_info_level == DINFO_LEVEL_NONE | |
| 203 /* When doing declaration merging we have duplicate | |
| 204 entries for given decl. Do not attempt to remove | |
| 145 | 205 the bodies, or we will end up removing |
| 111 | 206 wrong one. */ |
| 207 && symtab->state != LTO_STREAMING) | |
| 208 DECL_INITIAL (decl) = error_mark_node; | |
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209 } |
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210 |
| 111 | 211 /* Dump given varpool node to F. */ |
| 0 | 212 void |
| 111 | 213 varpool_node::dump (FILE *f) |
| 0 | 214 { |
| 111 | 215 dump_base (f); |
| 216 fprintf (f, " Availability: %s\n", | |
| 217 symtab->function_flags_ready | |
| 218 ? cgraph_availability_names[get_availability ()] | |
| 0 | 219 : "not-ready"); |
| 111 | 220 fprintf (f, " Varpool flags:"); |
| 221 if (DECL_INITIAL (decl)) | |
| 0 | 222 fprintf (f, " initialized"); |
| 111 | 223 if (output) |
| 0 | 224 fprintf (f, " output"); |
| 111 | 225 if (used_by_single_function) |
| 226 fprintf (f, " used-by-single-function"); | |
| 227 if (TREE_READONLY (decl)) | |
| 228 fprintf (f, " read-only"); | |
| 229 if (ctor_useable_for_folding_p ()) | |
| 230 fprintf (f, " const-value-known"); | |
| 231 if (writeonly) | |
| 232 fprintf (f, " write-only"); | |
| 233 if (tls_model) | |
| 234 fprintf (f, " tls-%s", tls_model_names [tls_model]); | |
| 0 | 235 fprintf (f, "\n"); |
| 236 } | |
| 237 | |
| 111 | 238 |
| 239 /* Dump given varpool node to stderr. */ | |
| 240 void varpool_node::debug (void) | |
| 241 { | |
| 242 varpool_node::dump (stderr); | |
| 243 } | |
| 244 | |
| 245 /* Dump the variable pool to F. */ | |
| 0 | 246 void |
| 111 | 247 varpool_node::dump_varpool (FILE *f) |
| 0 | 248 { |
| 111 | 249 varpool_node *node; |
| 0 | 250 |
| 251 fprintf (f, "variable pool:\n\n"); | |
| 111 | 252 FOR_EACH_VARIABLE (node) |
| 253 node->dump (f); | |
| 0 | 254 } |
| 255 | |
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256 /* Dump the variable pool to stderr. */ |
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257 |
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258 DEBUG_FUNCTION void |
| 111 | 259 varpool_node::debug_varpool (void) |
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260 { |
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261 dump_varpool (stderr); |
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262 } |
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263 |
| 0 | 264 /* Given an assembler name, lookup node. */ |
| 111 | 265 varpool_node * |
| 266 varpool_node::get_for_asmname (tree asmname) | |
| 0 | 267 { |
| 111 | 268 if (symtab_node *node = symtab_node::get_for_asmname (asmname)) |
| 269 return dyn_cast <varpool_node *> (node); | |
| 270 else | |
| 271 return NULL; | |
| 0 | 272 } |
| 273 | |
| 111 | 274 /* When doing LTO, read variable's constructor from disk if |
| 275 it is not already present. */ | |
| 276 | |
| 277 tree | |
| 278 varpool_node::get_constructor (void) | |
| 0 | 279 { |
| 111 | 280 lto_file_decl_data *file_data; |
| 281 const char *data, *name; | |
| 282 size_t len; | |
| 283 | |
| 284 if (DECL_INITIAL (decl) != error_mark_node | |
| 285 || !in_lto_p | |
| 286 || !lto_file_data) | |
| 287 return DECL_INITIAL (decl); | |
| 288 | |
| 289 timevar_push (TV_IPA_LTO_CTORS_IN); | |
| 290 | |
| 291 file_data = lto_file_data; | |
| 292 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)); | |
| 293 | |
| 294 /* We may have renamed the declaration, e.g., a static function. */ | |
| 295 name = lto_get_decl_name_mapping (file_data, name); | |
| 296 struct lto_in_decl_state *decl_state | |
| 297 = lto_get_function_in_decl_state (file_data, decl); | |
| 298 | |
| 299 data = lto_get_section_data (file_data, LTO_section_function_body, | |
| 145 | 300 name, order - file_data->order_base, |
| 301 &len, decl_state->compressed); | |
| 111 | 302 if (!data) |
| 145 | 303 fatal_error (input_location, "%s: section %s.%d is missing", |
| 111 | 304 file_data->file_name, |
| 145 | 305 name, order - file_data->order_base); |
| 111 | 306 |
| 131 | 307 if (!quiet_flag) |
| 308 fprintf (stderr, " in:%s", IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl))); | |
| 111 | 309 lto_input_variable_constructor (file_data, this, data); |
| 310 gcc_assert (DECL_INITIAL (decl) != error_mark_node); | |
| 311 lto_stats.num_function_bodies++; | |
| 312 lto_free_section_data (file_data, LTO_section_function_body, name, | |
| 313 data, len, decl_state->compressed); | |
| 314 lto_free_function_in_decl_state_for_node (this); | |
| 315 timevar_pop (TV_IPA_LTO_CTORS_IN); | |
| 316 return DECL_INITIAL (decl); | |
| 0 | 317 } |
| 318 | |
| 111 | 319 /* Return true if variable has constructor that can be used for folding. */ |
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320 |
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321 bool |
| 111 | 322 varpool_node::ctor_useable_for_folding_p (void) |
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323 { |
| 111 | 324 varpool_node *real_node = this; |
| 325 | |
| 326 if (real_node->alias && real_node->definition) | |
| 327 real_node = ultimate_alias_target (); | |
| 0 | 328 |
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329 if (TREE_CODE (decl) == CONST_DECL |
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330 || DECL_IN_CONSTANT_POOL (decl)) |
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331 return true; |
| 111 | 332 if (TREE_THIS_VOLATILE (decl)) |
| 333 return false; | |
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334 |
| 145 | 335 /* Avoid attempts to load constructors that was not streamed. */ |
| 336 if (in_lto_p && DECL_INITIAL (real_node->decl) == error_mark_node | |
| 337 && real_node->body_removed) | |
| 338 return false; | |
| 339 | |
| 111 | 340 /* If we do not have a constructor, we can't use it. */ |
| 341 if (DECL_INITIAL (real_node->decl) == error_mark_node | |
| 342 && !real_node->lto_file_data) | |
| 343 return false; | |
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344 |
| 111 | 345 /* Vtables are defined by their types and must match no matter of interposition |
| 346 rules. */ | |
| 347 if (DECL_VIRTUAL_P (decl)) | |
| 348 { | |
| 349 /* The C++ front end creates VAR_DECLs for vtables of typeinfo | |
| 350 classes not defined in the current TU so that it can refer | |
| 351 to them from typeinfo objects. Avoid returning NULL_TREE. */ | |
| 352 return DECL_INITIAL (real_node->decl) != NULL; | |
| 353 } | |
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354 |
| 145 | 355 /* An alias of a read-only variable is also read-only, since the variable |
| 356 is stored in read-only memory. We also accept read-only aliases of | |
| 357 non-read-only locations assuming that the user knows what he is asking | |
| 358 for. */ | |
| 111 | 359 if (!TREE_READONLY (decl) && !TREE_READONLY (real_node->decl)) |
| 360 return false; | |
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361 |
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362 /* Variables declared 'const' without an initializer |
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363 have zero as the initializer if they may not be |
| 111 | 364 overridden at link or run time. |
| 365 | |
| 366 It is actually requirement for C++ compiler to optimize const variables | |
| 145 | 367 consistently. As a GNU extension, do not enforce this rule for user defined |
| 111 | 368 weak variables, so we support interposition on: |
| 369 static const int dummy = 0; | |
| 370 extern const int foo __attribute__((__weak__, __alias__("dummy"))); | |
| 371 */ | |
| 372 if ((!DECL_INITIAL (real_node->decl) | |
| 373 || (DECL_WEAK (decl) && !DECL_COMDAT (decl))) | |
| 374 && (DECL_EXTERNAL (decl) || decl_replaceable_p (decl))) | |
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375 return false; |
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376 |
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377 /* Variables declared `const' with an initializer are considered |
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378 to not be overwritable with different initializer by default. |
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379 |
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380 ??? Previously we behaved so for scalar variables but not for array |
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381 accesses. */ |
| 0 | 382 return true; |
| 383 } | |
| 384 | |
| 111 | 385 /* If DECLARATION is constant variable and its initial value is known |
| 386 (so we can do constant folding), return its constructor (DECL_INITIAL). | |
| 387 This may be an expression or NULL when DECL is initialized to 0. | |
| 388 Return ERROR_MARK_NODE otherwise. | |
| 389 | |
| 390 In LTO this may actually trigger reading the constructor from disk. | |
| 391 For this reason varpool_ctor_useable_for_folding_p should be used when | |
| 392 the actual constructor value is not needed. */ | |
| 393 | |
| 394 tree | |
| 395 ctor_for_folding (tree decl) | |
| 0 | 396 { |
| 111 | 397 varpool_node *node, *real_node; |
| 398 tree real_decl; | |
| 399 | |
| 400 if (!VAR_P (decl) && TREE_CODE (decl) != CONST_DECL) | |
| 401 return error_mark_node; | |
| 402 | |
| 403 if (TREE_CODE (decl) == CONST_DECL | |
| 404 || DECL_IN_CONSTANT_POOL (decl)) | |
| 405 return DECL_INITIAL (decl); | |
| 406 | |
| 407 if (TREE_THIS_VOLATILE (decl)) | |
| 408 return error_mark_node; | |
| 409 | |
| 410 /* Do not care about automatic variables. Those are never initialized | |
| 145 | 411 anyway, because gimplifier expands the code. */ |
| 111 | 412 if (!TREE_STATIC (decl) && !DECL_EXTERNAL (decl)) |
| 413 { | |
| 414 gcc_assert (!TREE_PUBLIC (decl)); | |
| 415 return error_mark_node; | |
| 416 } | |
| 417 | |
| 418 gcc_assert (VAR_P (decl)); | |
|
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419 |
| 111 | 420 real_node = node = varpool_node::get (decl); |
| 421 if (node) | |
| 0 | 422 { |
| 111 | 423 real_node = node->ultimate_alias_target (); |
| 424 real_decl = real_node->decl; | |
| 425 } | |
| 426 else | |
| 427 real_decl = decl; | |
| 428 | |
| 429 /* See if we are dealing with alias. | |
| 430 In most cases alias is just alternative symbol pointing to a given | |
| 431 constructor. This allows us to use interposition rules of DECL | |
| 432 constructor of REAL_NODE. However weakrefs are special by being just | |
| 433 alternative name of their target (if defined). */ | |
| 434 if (decl != real_decl) | |
| 435 { | |
| 436 gcc_assert (!DECL_INITIAL (decl) | |
| 437 || (node->alias && node->get_alias_target () == real_node) | |
| 438 || DECL_INITIAL (decl) == error_mark_node); | |
| 439 while (node->transparent_alias && node->analyzed) | |
| 440 { | |
| 441 node = node->get_alias_target (); | |
| 442 decl = node->decl; | |
| 443 } | |
| 0 | 444 } |
| 111 | 445 |
| 446 if ((!DECL_VIRTUAL_P (real_decl) | |
| 447 || DECL_INITIAL (real_decl) == error_mark_node | |
| 448 || !DECL_INITIAL (real_decl)) | |
| 449 && (!node || !node->ctor_useable_for_folding_p ())) | |
| 450 return error_mark_node; | |
| 451 | |
| 452 /* OK, we can return constructor. See if we need to fetch it from disk | |
| 453 in LTO mode. */ | |
| 454 if (DECL_INITIAL (real_decl) != error_mark_node | |
| 455 || !in_lto_p) | |
| 456 return DECL_INITIAL (real_decl); | |
| 457 return real_node->get_constructor (); | |
| 458 } | |
| 0 | 459 |
| 111 | 460 /* Add the variable DECL to the varpool. |
| 461 Unlike finalize_decl function is intended to be used | |
| 462 by middle end and allows insertion of new variable at arbitrary point | |
| 463 of compilation. */ | |
| 464 void | |
| 465 varpool_node::add (tree decl) | |
| 466 { | |
| 467 varpool_node *node; | |
| 468 varpool_node::finalize_decl (decl); | |
| 469 node = varpool_node::get_create (decl); | |
| 470 symtab->call_varpool_insertion_hooks (node); | |
| 471 if (node->externally_visible_p ()) | |
| 472 node->externally_visible = true; | |
| 473 if (lookup_attribute ("no_reorder", DECL_ATTRIBUTES (decl))) | |
| 474 node->no_reorder = 1; | |
| 0 | 475 } |
| 476 | |
| 477 /* Return variable availability. See cgraph.h for description of individual | |
| 478 return values. */ | |
| 479 enum availability | |
| 111 | 480 varpool_node::get_availability (symtab_node *ref) |
| 0 | 481 { |
| 111 | 482 if (!definition) |
| 0 | 483 return AVAIL_NOT_AVAILABLE; |
| 111 | 484 if (!TREE_PUBLIC (decl)) |
| 485 return AVAIL_AVAILABLE; | |
| 486 if (DECL_IN_CONSTANT_POOL (decl) | |
| 487 || DECL_VIRTUAL_P (decl)) | |
| 488 return AVAIL_AVAILABLE; | |
| 489 if (transparent_alias && definition) | |
| 490 { | |
| 491 enum availability avail; | |
| 492 | |
| 493 ultimate_alias_target (&avail, ref); | |
| 494 return avail; | |
| 495 } | |
| 496 /* If this is a reference from symbol itself and there are no aliases, we | |
| 497 may be sure that the symbol was not interposed by something else because | |
| 498 the symbol itself would be unreachable otherwise. */ | |
| 499 if ((this == ref && !has_aliases_p ()) | |
| 500 || (ref && get_comdat_group () | |
| 501 && get_comdat_group () == ref->get_comdat_group ())) | |
| 0 | 502 return AVAIL_AVAILABLE; |
| 503 /* If the variable can be overwritten, return OVERWRITABLE. Takes | |
| 111 | 504 care of at least one notable extension - the COMDAT variables |
| 0 | 505 used to share template instantiations in C++. */ |
| 111 | 506 if (decl_replaceable_p (decl) |
| 507 || DECL_EXTERNAL (decl)) | |
| 508 return AVAIL_INTERPOSABLE; | |
| 0 | 509 return AVAIL_AVAILABLE; |
| 510 } | |
| 511 | |
| 111 | 512 void |
| 513 varpool_node::analyze (void) | |
| 0 | 514 { |
| 111 | 515 /* When reading back varpool at LTO time, we re-construct the queue in order |
| 516 to have "needed" list right by inserting all needed nodes into varpool. | |
| 517 We however don't want to re-analyze already analyzed nodes. */ | |
| 518 if (!analyzed) | |
| 0 | 519 { |
| 111 | 520 gcc_assert (!in_lto_p || symtab->function_flags_ready); |
| 521 /* Compute the alignment early so function body expanders are | |
| 522 already informed about increased alignment. */ | |
| 523 align_variable (decl, 0); | |
| 524 } | |
| 525 if (alias) | |
| 526 resolve_alias (varpool_node::get (alias_target)); | |
| 527 else if (DECL_INITIAL (decl)) | |
| 528 record_references_in_initializer (decl, analyzed); | |
| 529 analyzed = true; | |
| 530 } | |
| 0 | 531 |
| 111 | 532 /* Assemble thunks and aliases associated to varpool node. */ |
| 533 | |
| 534 void | |
| 535 varpool_node::assemble_aliases (void) | |
| 536 { | |
| 537 ipa_ref *ref; | |
| 538 | |
| 539 FOR_EACH_ALIAS (this, ref) | |
| 540 { | |
| 541 varpool_node *alias = dyn_cast <varpool_node *> (ref->referring); | |
| 145 | 542 if (alias->symver) |
| 543 do_assemble_symver (alias->decl, | |
| 544 DECL_ASSEMBLER_NAME (decl)); | |
| 545 else if (!alias->transparent_alias) | |
| 111 | 546 do_assemble_alias (alias->decl, |
| 547 DECL_ASSEMBLER_NAME (decl)); | |
| 548 alias->assemble_aliases (); | |
| 0 | 549 } |
| 550 } | |
| 551 | |
| 552 /* Output one variable, if necessary. Return whether we output it. */ | |
| 111 | 553 |
| 0 | 554 bool |
| 111 | 555 varpool_node::assemble_decl (void) |
| 0 | 556 { |
| 145 | 557 /* Aliases are output when their target is produced or by |
| 111 | 558 output_weakrefs. */ |
| 559 if (alias) | |
| 560 return false; | |
| 0 | 561 |
| 111 | 562 /* Constant pool is output from RTL land when the reference |
| 563 survive till this level. */ | |
| 564 if (DECL_IN_CONSTANT_POOL (decl) && TREE_ASM_WRITTEN (decl)) | |
| 565 return false; | |
| 566 | |
| 567 /* Decls with VALUE_EXPR should not be in the varpool at all. They | |
| 568 are not real variables, but just info for debugging and codegen. | |
| 569 Unfortunately at the moment emutls is not updating varpool correctly | |
| 570 after turning real vars into value_expr vars. */ | |
| 571 if (DECL_HAS_VALUE_EXPR_P (decl) | |
| 572 && !targetm.have_tls) | |
| 573 return false; | |
|
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574 |
| 111 | 575 /* Hard register vars do not need to be output. */ |
| 576 if (DECL_HARD_REGISTER (decl)) | |
| 577 return false; | |
| 578 | |
| 579 gcc_checking_assert (!TREE_ASM_WRITTEN (decl) | |
| 580 && VAR_P (decl) | |
| 581 && !DECL_HAS_VALUE_EXPR_P (decl)); | |
|
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582 |
| 111 | 583 if (!in_other_partition |
| 584 && !DECL_EXTERNAL (decl)) | |
| 585 { | |
| 586 get_constructor (); | |
| 587 assemble_variable (decl, 0, 1, 0); | |
| 588 gcc_assert (TREE_ASM_WRITTEN (decl)); | |
| 589 gcc_assert (definition); | |
| 590 assemble_aliases (); | |
| 591 /* After the parser has generated debugging information, augment | |
| 592 this information with any new location/etc information that may | |
| 593 have become available after the compilation proper. */ | |
| 594 debug_hooks->late_global_decl (decl); | |
| 595 return true; | |
| 0 | 596 } |
| 597 | |
| 598 return false; | |
| 599 } | |
| 600 | |
| 111 | 601 /* Add NODE to queue starting at FIRST. |
| 602 The queue is linked via AUX pointers and terminated by pointer to 1. */ | |
| 603 | |
| 604 static void | |
| 605 enqueue_node (varpool_node *node, varpool_node **first) | |
| 606 { | |
| 607 if (node->aux) | |
| 608 return; | |
| 609 gcc_checking_assert (*first); | |
| 610 node->aux = *first; | |
| 611 *first = node; | |
| 612 } | |
| 0 | 613 |
| 111 | 614 /* Optimization of function bodies might've rendered some variables as |
| 615 unnecessary so we want to avoid these from being compiled. Re-do | |
| 616 reachability starting from variables that are either externally visible | |
| 617 or was referred from the asm output routines. */ | |
| 618 | |
| 0 | 619 void |
| 111 | 620 symbol_table::remove_unreferenced_decls (void) |
| 0 | 621 { |
| 111 | 622 varpool_node *next, *node; |
| 623 varpool_node *first = (varpool_node *)(void *)1; | |
| 624 int i; | |
| 625 ipa_ref *ref = NULL; | |
| 626 hash_set<varpool_node *> referenced; | |
| 0 | 627 |
|
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628 if (seen_error ()) |
| 0 | 629 return; |
| 630 | |
| 111 | 631 if (dump_file) |
| 632 fprintf (dump_file, "Trivially needed variables:"); | |
| 633 FOR_EACH_DEFINED_VARIABLE (node) | |
| 0 | 634 { |
|
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635 if (node->analyzed |
| 111 | 636 && (!node->can_remove_if_no_refs_p () |
|
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637 /* We just expanded all function bodies. See if any of |
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638 them needed the variable. */ |
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639 || DECL_RTL_SET_P (node->decl))) |
| 111 | 640 { |
| 641 enqueue_node (node, &first); | |
| 642 if (dump_file) | |
| 145 | 643 fprintf (dump_file, " %s", node->dump_asm_name ()); |
| 111 | 644 } |
| 0 | 645 } |
| 111 | 646 while (first != (varpool_node *)(void *)1) |
| 647 { | |
| 648 node = first; | |
| 649 first = (varpool_node *)first->aux; | |
| 650 | |
| 651 if (node->same_comdat_group) | |
| 652 { | |
| 653 symtab_node *next; | |
| 654 for (next = node->same_comdat_group; | |
| 655 next != node; | |
| 656 next = next->same_comdat_group) | |
| 657 { | |
| 658 varpool_node *vnext = dyn_cast <varpool_node *> (next); | |
| 659 if (vnext && vnext->analyzed && !next->comdat_local_p ()) | |
| 660 enqueue_node (vnext, &first); | |
| 661 } | |
| 662 } | |
| 663 for (i = 0; node->iterate_reference (i, ref); i++) | |
| 664 { | |
| 665 varpool_node *vnode = dyn_cast <varpool_node *> (ref->referred); | |
| 666 if (vnode | |
| 667 && !vnode->in_other_partition | |
| 668 && (!DECL_EXTERNAL (ref->referred->decl) | |
| 669 || vnode->alias) | |
| 670 && vnode->analyzed) | |
| 671 enqueue_node (vnode, &first); | |
| 672 else | |
| 673 { | |
| 674 referenced.add (vnode); | |
| 675 while (vnode && vnode->alias && vnode->definition) | |
| 676 { | |
| 677 vnode = vnode->get_alias_target (); | |
| 678 referenced.add (vnode); | |
| 679 } | |
| 680 } | |
| 681 } | |
| 682 } | |
| 683 if (dump_file) | |
| 684 fprintf (dump_file, "\nRemoving variables:"); | |
| 685 for (node = first_defined_variable (); node; node = next) | |
| 686 { | |
| 687 next = next_defined_variable (node); | |
| 688 if (!node->aux && !node->no_reorder) | |
| 689 { | |
| 690 if (dump_file) | |
| 145 | 691 fprintf (dump_file, " %s", node->dump_asm_name ()); |
| 111 | 692 if (referenced.contains(node)) |
| 693 node->remove_initializer (); | |
| 694 else | |
| 695 node->remove (); | |
| 696 } | |
| 697 } | |
| 698 | |
| 699 if (dump_file) | |
| 700 fprintf (dump_file, "\n"); | |
| 0 | 701 } |
| 702 | |
|
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703 /* For variables in named sections make sure get_variable_section |
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704 is called before we switch to those sections. Then section |
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705 conflicts between read-only and read-only requiring relocations |
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706 sections can be resolved. */ |
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707 void |
| 111 | 708 varpool_node::finalize_named_section_flags (void) |
|
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709 { |
| 111 | 710 if (!TREE_ASM_WRITTEN (decl) |
| 711 && !alias | |
| 712 && !in_other_partition | |
| 713 && !DECL_EXTERNAL (decl) | |
| 714 && VAR_P (decl) | |
| 715 && !DECL_HAS_VALUE_EXPR_P (decl) | |
| 716 && get_section ()) | |
| 717 get_variable_section (decl, false); | |
|
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718 } |
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719 |
| 0 | 720 /* Output all variables enqueued to be assembled. */ |
| 721 bool | |
| 111 | 722 symbol_table::output_variables (void) |
| 0 | 723 { |
| 724 bool changed = false; | |
| 111 | 725 varpool_node *node; |
| 0 | 726 |
|
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727 if (seen_error ()) |
| 0 | 728 return false; |
| 729 | |
| 111 | 730 remove_unreferenced_decls (); |
| 731 | |
|
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732 timevar_push (TV_VAROUT); |
| 0 | 733 |
| 111 | 734 FOR_EACH_DEFINED_VARIABLE (node) |
| 735 { | |
| 736 /* Handled in output_in_order. */ | |
| 737 if (node->no_reorder) | |
| 738 continue; | |
|
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739 |
| 111 | 740 node->finalize_named_section_flags (); |
| 741 } | |
| 0 | 742 |
| 111 | 743 /* There is a similar loop in output_in_order. Please keep them in sync. */ |
| 744 FOR_EACH_VARIABLE (node) | |
| 745 { | |
| 746 /* Handled in output_in_order. */ | |
| 747 if (node->no_reorder) | |
| 748 continue; | |
| 749 if (DECL_HARD_REGISTER (node->decl) | |
| 750 || DECL_HAS_VALUE_EXPR_P (node->decl)) | |
| 751 continue; | |
| 752 if (node->definition) | |
| 753 changed |= node->assemble_decl (); | |
| 0 | 754 else |
| 111 | 755 assemble_undefined_decl (node->decl); |
| 0 | 756 } |
|
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757 timevar_pop (TV_VAROUT); |
| 0 | 758 return changed; |
| 759 } | |
| 760 | |
|
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761 /* Attempt to mark ALIAS as an alias to DECL. Return TRUE if successful. |
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762 Extra name aliases are output whenever DECL is output. */ |
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763 |
| 111 | 764 varpool_node * |
| 765 varpool_node::create_alias (tree alias, tree decl) | |
|
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766 { |
| 111 | 767 varpool_node *alias_node; |
|
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768 |
| 111 | 769 gcc_assert (VAR_P (decl)); |
| 770 gcc_assert (VAR_P (alias)); | |
| 771 alias_node = varpool_node::get_create (alias); | |
| 772 alias_node->alias = true; | |
| 773 alias_node->definition = true; | |
| 774 alias_node->alias_target = decl; | |
| 775 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (alias)) != NULL) | |
| 776 alias_node->weakref = alias_node->transparent_alias = true; | |
|
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777 return alias_node; |
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778 } |
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779 |
| 111 | 780 /* Attempt to mark ALIAS as an alias to DECL. Return TRUE if successful. |
| 781 Extra name aliases are output whenever DECL is output. */ | |
| 782 | |
| 783 varpool_node * | |
| 784 varpool_node::create_extra_name_alias (tree alias, tree decl) | |
| 785 { | |
| 786 varpool_node *alias_node; | |
| 787 | |
| 788 /* If aliases aren't supported by the assembler, fail. */ | |
| 789 if (!TARGET_SUPPORTS_ALIASES) | |
| 790 return NULL; | |
| 791 | |
| 792 alias_node = varpool_node::create_alias (alias, decl); | |
| 793 alias_node->cpp_implicit_alias = true; | |
| 794 | |
| 145 | 795 /* Extra name alias mechanism creates aliases really late |
| 796 via DECL_ASSEMBLER_NAME mechanism. | |
| 111 | 797 This is unfortunate because they are not going through the |
| 798 standard channels. Ensure they get output. */ | |
| 799 if (symtab->cpp_implicit_aliases_done) | |
| 800 alias_node->resolve_alias (varpool_node::get_create (decl)); | |
| 801 return alias_node; | |
| 802 } | |
| 803 | |
| 804 /* 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
|
805 |
|
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
|
806 bool |
| 111 | 807 varpool_node::call_for_symbol_and_aliases_1 (bool (*callback) (varpool_node *, |
| 808 void *), | |
| 809 void *data, | |
| 810 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
|
811 { |
| 111 | 812 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
|
813 |
| 111 | 814 FOR_EACH_ALIAS (this, ref) |
| 815 { | |
| 816 varpool_node *alias = dyn_cast <varpool_node *> (ref->referring); | |
| 817 if (include_overwritable | |
| 818 || alias->get_availability () > AVAIL_INTERPOSABLE) | |
| 819 if (alias->call_for_symbol_and_aliases (callback, data, | |
| 820 include_overwritable)) | |
| 821 return true; | |
| 822 } | |
|
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
|
823 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
|
824 } |