Mercurial > hg > CbC > CbC_gcc
annotate gcc/varpool.c @ 116:367f9f4f266e
fix gimple.h
| author | mir3636 |
|---|---|
| date | Tue, 28 Nov 2017 20:22:01 +0900 |
| parents | 04ced10e8804 |
| children | 84e7813d76e9 |
| rev | line source |
|---|---|
| 0 | 1 /* Callgraph handling code. |
| 111 | 2 Copyright (C) 2003-2017 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 | |
| 310 lto_input_variable_constructor (file_data, this, data); | |
| 311 gcc_assert (DECL_INITIAL (decl) != error_mark_node); | |
| 312 lto_stats.num_function_bodies++; | |
| 313 lto_free_section_data (file_data, LTO_section_function_body, name, | |
| 314 data, len, decl_state->compressed); | |
| 315 lto_free_function_in_decl_state_for_node (this); | |
| 316 timevar_pop (TV_IPA_LTO_CTORS_IN); | |
| 317 return DECL_INITIAL (decl); | |
| 0 | 318 } |
| 319 | |
| 111 | 320 /* Return true if variable has constructor that can be used for folding. */ |
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321 |
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322 bool |
| 111 | 323 varpool_node::ctor_useable_for_folding_p (void) |
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324 { |
| 111 | 325 varpool_node *real_node = this; |
| 326 | |
| 327 if (real_node->alias && real_node->definition) | |
| 328 real_node = ultimate_alias_target (); | |
| 0 | 329 |
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330 if (TREE_CODE (decl) == CONST_DECL |
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331 || DECL_IN_CONSTANT_POOL (decl)) |
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332 return true; |
| 111 | 333 if (TREE_THIS_VOLATILE (decl)) |
| 334 return false; | |
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335 |
| 111 | 336 /* If we do not have a constructor, we can't use it. */ |
| 337 if (DECL_INITIAL (real_node->decl) == error_mark_node | |
| 338 && !real_node->lto_file_data) | |
| 339 return false; | |
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340 |
| 111 | 341 /* Avoid attempts to load constructors that was not streamed. */ |
| 342 if (flag_ltrans && DECL_INITIAL (real_node->decl) == error_mark_node | |
| 343 && real_node->body_removed) | |
| 0 | 344 return false; |
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345 |
| 111 | 346 /* Vtables are defined by their types and must match no matter of interposition |
| 347 rules. */ | |
| 348 if (DECL_VIRTUAL_P (decl)) | |
| 349 { | |
| 350 /* The C++ front end creates VAR_DECLs for vtables of typeinfo | |
| 351 classes not defined in the current TU so that it can refer | |
| 352 to them from typeinfo objects. Avoid returning NULL_TREE. */ | |
| 353 return DECL_INITIAL (real_node->decl) != NULL; | |
| 354 } | |
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355 |
| 111 | 356 /* Alias of readonly variable is also readonly, since the variable is stored |
| 357 in readonly memory. We also accept readonly aliases of non-readonly | |
| 358 locations assuming that user knows what he is asking for. */ | |
| 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 | |
| 367 consistently. As a GNU extension, do not enfore this rule for user defined | |
| 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 /* Static constant bounds are created to be | |
| 404 used instead of constants and therefore | |
| 405 do not let folding it. */ | |
| 406 if (POINTER_BOUNDS_P (decl)) | |
| 407 return error_mark_node; | |
| 0 | 408 |
| 111 | 409 if (TREE_CODE (decl) == CONST_DECL |
| 410 || DECL_IN_CONSTANT_POOL (decl)) | |
| 411 return DECL_INITIAL (decl); | |
| 412 | |
| 413 if (TREE_THIS_VOLATILE (decl)) | |
| 414 return error_mark_node; | |
| 415 | |
| 416 /* Do not care about automatic variables. Those are never initialized | |
| 417 anyway, because gimplifier exapnds the code. */ | |
| 418 if (!TREE_STATIC (decl) && !DECL_EXTERNAL (decl)) | |
| 419 { | |
| 420 gcc_assert (!TREE_PUBLIC (decl)); | |
| 421 return error_mark_node; | |
| 422 } | |
| 423 | |
| 424 gcc_assert (VAR_P (decl)); | |
|
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425 |
| 111 | 426 real_node = node = varpool_node::get (decl); |
| 427 if (node) | |
| 0 | 428 { |
| 111 | 429 real_node = node->ultimate_alias_target (); |
| 430 real_decl = real_node->decl; | |
| 431 } | |
| 432 else | |
| 433 real_decl = decl; | |
| 434 | |
| 435 /* See if we are dealing with alias. | |
| 436 In most cases alias is just alternative symbol pointing to a given | |
| 437 constructor. This allows us to use interposition rules of DECL | |
| 438 constructor of REAL_NODE. However weakrefs are special by being just | |
| 439 alternative name of their target (if defined). */ | |
| 440 if (decl != real_decl) | |
| 441 { | |
| 442 gcc_assert (!DECL_INITIAL (decl) | |
| 443 || (node->alias && node->get_alias_target () == real_node) | |
| 444 || DECL_INITIAL (decl) == error_mark_node); | |
| 445 while (node->transparent_alias && node->analyzed) | |
| 446 { | |
| 447 node = node->get_alias_target (); | |
| 448 decl = node->decl; | |
| 449 } | |
| 0 | 450 } |
| 111 | 451 |
| 452 if ((!DECL_VIRTUAL_P (real_decl) | |
| 453 || DECL_INITIAL (real_decl) == error_mark_node | |
| 454 || !DECL_INITIAL (real_decl)) | |
| 455 && (!node || !node->ctor_useable_for_folding_p ())) | |
| 456 return error_mark_node; | |
| 457 | |
| 458 /* OK, we can return constructor. See if we need to fetch it from disk | |
| 459 in LTO mode. */ | |
| 460 if (DECL_INITIAL (real_decl) != error_mark_node | |
| 461 || !in_lto_p) | |
| 462 return DECL_INITIAL (real_decl); | |
| 463 return real_node->get_constructor (); | |
| 464 } | |
| 0 | 465 |
| 111 | 466 /* Add the variable DECL to the varpool. |
| 467 Unlike finalize_decl function is intended to be used | |
| 468 by middle end and allows insertion of new variable at arbitrary point | |
| 469 of compilation. */ | |
| 470 void | |
| 471 varpool_node::add (tree decl) | |
| 472 { | |
| 473 varpool_node *node; | |
| 474 varpool_node::finalize_decl (decl); | |
| 475 node = varpool_node::get_create (decl); | |
| 476 symtab->call_varpool_insertion_hooks (node); | |
| 477 if (node->externally_visible_p ()) | |
| 478 node->externally_visible = true; | |
| 479 if (lookup_attribute ("no_reorder", DECL_ATTRIBUTES (decl))) | |
| 480 node->no_reorder = 1; | |
| 0 | 481 } |
| 482 | |
| 483 /* Return variable availability. See cgraph.h for description of individual | |
| 484 return values. */ | |
| 485 enum availability | |
| 111 | 486 varpool_node::get_availability (symtab_node *ref) |
| 0 | 487 { |
| 111 | 488 if (!definition) |
| 0 | 489 return AVAIL_NOT_AVAILABLE; |
| 111 | 490 if (!TREE_PUBLIC (decl)) |
| 491 return AVAIL_AVAILABLE; | |
| 492 if (DECL_IN_CONSTANT_POOL (decl) | |
| 493 || DECL_VIRTUAL_P (decl)) | |
| 494 return AVAIL_AVAILABLE; | |
| 495 if (transparent_alias && definition) | |
| 496 { | |
| 497 enum availability avail; | |
| 498 | |
| 499 ultimate_alias_target (&avail, ref); | |
| 500 return avail; | |
| 501 } | |
| 502 /* If this is a reference from symbol itself and there are no aliases, we | |
| 503 may be sure that the symbol was not interposed by something else because | |
| 504 the symbol itself would be unreachable otherwise. */ | |
| 505 if ((this == ref && !has_aliases_p ()) | |
| 506 || (ref && get_comdat_group () | |
| 507 && get_comdat_group () == ref->get_comdat_group ())) | |
| 0 | 508 return AVAIL_AVAILABLE; |
| 509 /* If the variable can be overwritten, return OVERWRITABLE. Takes | |
| 111 | 510 care of at least one notable extension - the COMDAT variables |
| 0 | 511 used to share template instantiations in C++. */ |
| 111 | 512 if (decl_replaceable_p (decl) |
| 513 || DECL_EXTERNAL (decl)) | |
| 514 return AVAIL_INTERPOSABLE; | |
| 0 | 515 return AVAIL_AVAILABLE; |
| 516 } | |
| 517 | |
| 111 | 518 void |
| 519 varpool_node::analyze (void) | |
| 0 | 520 { |
| 111 | 521 /* When reading back varpool at LTO time, we re-construct the queue in order |
| 522 to have "needed" list right by inserting all needed nodes into varpool. | |
| 523 We however don't want to re-analyze already analyzed nodes. */ | |
| 524 if (!analyzed) | |
| 0 | 525 { |
| 111 | 526 gcc_assert (!in_lto_p || symtab->function_flags_ready); |
| 527 /* Compute the alignment early so function body expanders are | |
| 528 already informed about increased alignment. */ | |
| 529 align_variable (decl, 0); | |
| 530 } | |
| 531 if (alias) | |
| 532 resolve_alias (varpool_node::get (alias_target)); | |
| 533 else if (DECL_INITIAL (decl)) | |
| 534 record_references_in_initializer (decl, analyzed); | |
| 535 analyzed = true; | |
| 536 } | |
| 0 | 537 |
| 111 | 538 /* Assemble thunks and aliases associated to varpool node. */ |
| 539 | |
| 540 void | |
| 541 varpool_node::assemble_aliases (void) | |
| 542 { | |
| 543 ipa_ref *ref; | |
| 544 | |
| 545 FOR_EACH_ALIAS (this, ref) | |
| 546 { | |
| 547 varpool_node *alias = dyn_cast <varpool_node *> (ref->referring); | |
| 548 if (!alias->transparent_alias) | |
| 549 do_assemble_alias (alias->decl, | |
| 550 DECL_ASSEMBLER_NAME (decl)); | |
| 551 alias->assemble_aliases (); | |
| 0 | 552 } |
| 553 } | |
| 554 | |
| 555 /* Output one variable, if necessary. Return whether we output it. */ | |
| 111 | 556 |
| 0 | 557 bool |
| 111 | 558 varpool_node::assemble_decl (void) |
| 0 | 559 { |
| 111 | 560 /* Aliases are outout when their target is produced or by |
| 561 output_weakrefs. */ | |
| 562 if (alias) | |
| 563 return false; | |
| 0 | 564 |
| 111 | 565 /* Constant pool is output from RTL land when the reference |
| 566 survive till this level. */ | |
| 567 if (DECL_IN_CONSTANT_POOL (decl) && TREE_ASM_WRITTEN (decl)) | |
| 568 return false; | |
| 569 | |
| 570 /* Decls with VALUE_EXPR should not be in the varpool at all. They | |
| 571 are not real variables, but just info for debugging and codegen. | |
| 572 Unfortunately at the moment emutls is not updating varpool correctly | |
| 573 after turning real vars into value_expr vars. */ | |
| 574 if (DECL_HAS_VALUE_EXPR_P (decl) | |
| 575 && !targetm.have_tls) | |
| 576 return false; | |
|
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577 |
| 111 | 578 /* Hard register vars do not need to be output. */ |
| 579 if (DECL_HARD_REGISTER (decl)) | |
| 580 return false; | |
| 581 | |
| 582 gcc_checking_assert (!TREE_ASM_WRITTEN (decl) | |
| 583 && VAR_P (decl) | |
| 584 && !DECL_HAS_VALUE_EXPR_P (decl)); | |
|
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585 |
| 111 | 586 if (!in_other_partition |
| 587 && !DECL_EXTERNAL (decl)) | |
| 588 { | |
| 589 get_constructor (); | |
| 590 assemble_variable (decl, 0, 1, 0); | |
| 591 gcc_assert (TREE_ASM_WRITTEN (decl)); | |
| 592 gcc_assert (definition); | |
| 593 assemble_aliases (); | |
| 594 /* After the parser has generated debugging information, augment | |
| 595 this information with any new location/etc information that may | |
| 596 have become available after the compilation proper. */ | |
| 597 debug_hooks->late_global_decl (decl); | |
| 598 return true; | |
| 0 | 599 } |
| 600 | |
| 601 return false; | |
| 602 } | |
| 603 | |
| 111 | 604 /* Add NODE to queue starting at FIRST. |
| 605 The queue is linked via AUX pointers and terminated by pointer to 1. */ | |
| 606 | |
| 607 static void | |
| 608 enqueue_node (varpool_node *node, varpool_node **first) | |
| 609 { | |
| 610 if (node->aux) | |
| 611 return; | |
| 612 gcc_checking_assert (*first); | |
| 613 node->aux = *first; | |
| 614 *first = node; | |
| 615 } | |
| 0 | 616 |
| 111 | 617 /* Optimization of function bodies might've rendered some variables as |
| 618 unnecessary so we want to avoid these from being compiled. Re-do | |
| 619 reachability starting from variables that are either externally visible | |
| 620 or was referred from the asm output routines. */ | |
| 621 | |
| 0 | 622 void |
| 111 | 623 symbol_table::remove_unreferenced_decls (void) |
| 0 | 624 { |
| 111 | 625 varpool_node *next, *node; |
| 626 varpool_node *first = (varpool_node *)(void *)1; | |
| 627 int i; | |
| 628 ipa_ref *ref = NULL; | |
| 629 hash_set<varpool_node *> referenced; | |
| 0 | 630 |
|
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631 if (seen_error ()) |
| 0 | 632 return; |
| 633 | |
| 111 | 634 if (dump_file) |
| 635 fprintf (dump_file, "Trivially needed variables:"); | |
| 636 FOR_EACH_DEFINED_VARIABLE (node) | |
| 0 | 637 { |
|
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638 if (node->analyzed |
| 111 | 639 && (!node->can_remove_if_no_refs_p () |
|
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640 /* We just expanded all function bodies. See if any of |
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641 them needed the variable. */ |
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642 || DECL_RTL_SET_P (node->decl))) |
| 111 | 643 { |
| 644 enqueue_node (node, &first); | |
| 645 if (dump_file) | |
| 646 fprintf (dump_file, " %s", node->asm_name ()); | |
| 647 } | |
| 0 | 648 } |
| 111 | 649 while (first != (varpool_node *)(void *)1) |
| 650 { | |
| 651 node = first; | |
| 652 first = (varpool_node *)first->aux; | |
| 653 | |
| 654 if (node->same_comdat_group) | |
| 655 { | |
| 656 symtab_node *next; | |
| 657 for (next = node->same_comdat_group; | |
| 658 next != node; | |
| 659 next = next->same_comdat_group) | |
| 660 { | |
| 661 varpool_node *vnext = dyn_cast <varpool_node *> (next); | |
| 662 if (vnext && vnext->analyzed && !next->comdat_local_p ()) | |
| 663 enqueue_node (vnext, &first); | |
| 664 } | |
| 665 } | |
| 666 for (i = 0; node->iterate_reference (i, ref); i++) | |
| 667 { | |
| 668 varpool_node *vnode = dyn_cast <varpool_node *> (ref->referred); | |
| 669 if (vnode | |
| 670 && !vnode->in_other_partition | |
| 671 && (!DECL_EXTERNAL (ref->referred->decl) | |
| 672 || vnode->alias) | |
| 673 && vnode->analyzed) | |
| 674 enqueue_node (vnode, &first); | |
| 675 else | |
| 676 { | |
| 677 referenced.add (vnode); | |
| 678 while (vnode && vnode->alias && vnode->definition) | |
| 679 { | |
| 680 vnode = vnode->get_alias_target (); | |
| 681 referenced.add (vnode); | |
| 682 } | |
| 683 } | |
| 684 } | |
| 685 } | |
| 686 if (dump_file) | |
| 687 fprintf (dump_file, "\nRemoving variables:"); | |
| 688 for (node = first_defined_variable (); node; node = next) | |
| 689 { | |
| 690 next = next_defined_variable (node); | |
| 691 if (!node->aux && !node->no_reorder) | |
| 692 { | |
| 693 if (dump_file) | |
| 694 fprintf (dump_file, " %s", node->asm_name ()); | |
| 695 if (referenced.contains(node)) | |
| 696 node->remove_initializer (); | |
| 697 else | |
| 698 node->remove (); | |
| 699 } | |
| 700 } | |
| 701 | |
| 702 if (dump_file) | |
| 703 fprintf (dump_file, "\n"); | |
| 0 | 704 } |
| 705 | |
|
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706 /* For variables in named sections make sure get_variable_section |
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707 is called before we switch to those sections. Then section |
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708 conflicts between read-only and read-only requiring relocations |
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709 sections can be resolved. */ |
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710 void |
| 111 | 711 varpool_node::finalize_named_section_flags (void) |
|
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712 { |
| 111 | 713 if (!TREE_ASM_WRITTEN (decl) |
| 714 && !alias | |
| 715 && !in_other_partition | |
| 716 && !DECL_EXTERNAL (decl) | |
| 717 && VAR_P (decl) | |
| 718 && !DECL_HAS_VALUE_EXPR_P (decl) | |
| 719 && get_section ()) | |
| 720 get_variable_section (decl, false); | |
|
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721 } |
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722 |
| 0 | 723 /* Output all variables enqueued to be assembled. */ |
| 724 bool | |
| 111 | 725 symbol_table::output_variables (void) |
| 0 | 726 { |
| 727 bool changed = false; | |
| 111 | 728 varpool_node *node; |
| 0 | 729 |
|
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730 if (seen_error ()) |
| 0 | 731 return false; |
| 732 | |
| 111 | 733 remove_unreferenced_decls (); |
| 734 | |
|
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735 timevar_push (TV_VAROUT); |
| 0 | 736 |
| 111 | 737 FOR_EACH_DEFINED_VARIABLE (node) |
| 738 { | |
| 739 /* Handled in output_in_order. */ | |
| 740 if (node->no_reorder) | |
| 741 continue; | |
|
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742 |
| 111 | 743 node->finalize_named_section_flags (); |
| 744 } | |
| 0 | 745 |
| 111 | 746 /* There is a similar loop in output_in_order. Please keep them in sync. */ |
| 747 FOR_EACH_VARIABLE (node) | |
| 748 { | |
| 749 /* Handled in output_in_order. */ | |
| 750 if (node->no_reorder) | |
| 751 continue; | |
| 752 if (DECL_HARD_REGISTER (node->decl) | |
| 753 || DECL_HAS_VALUE_EXPR_P (node->decl)) | |
| 754 continue; | |
| 755 if (node->definition) | |
| 756 changed |= node->assemble_decl (); | |
| 0 | 757 else |
| 111 | 758 assemble_undefined_decl (node->decl); |
| 0 | 759 } |
|
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760 timevar_pop (TV_VAROUT); |
| 0 | 761 return changed; |
| 762 } | |
| 763 | |
|
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764 /* Attempt to mark ALIAS as an alias to DECL. Return TRUE if successful. |
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765 Extra name aliases are output whenever DECL is output. */ |
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766 |
| 111 | 767 varpool_node * |
| 768 varpool_node::create_alias (tree alias, tree decl) | |
|
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769 { |
| 111 | 770 varpool_node *alias_node; |
|
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771 |
| 111 | 772 gcc_assert (VAR_P (decl)); |
| 773 gcc_assert (VAR_P (alias)); | |
| 774 alias_node = varpool_node::get_create (alias); | |
| 775 alias_node->alias = true; | |
| 776 alias_node->definition = true; | |
| 777 alias_node->alias_target = decl; | |
| 778 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (alias)) != NULL) | |
| 779 alias_node->weakref = alias_node->transparent_alias = true; | |
|
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780 return alias_node; |
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781 } |
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782 |
| 111 | 783 /* Attempt to mark ALIAS as an alias to DECL. Return TRUE if successful. |
| 784 Extra name aliases are output whenever DECL is output. */ | |
| 785 | |
| 786 varpool_node * | |
| 787 varpool_node::create_extra_name_alias (tree alias, tree decl) | |
| 788 { | |
| 789 varpool_node *alias_node; | |
| 790 | |
| 791 /* If aliases aren't supported by the assembler, fail. */ | |
| 792 if (!TARGET_SUPPORTS_ALIASES) | |
| 793 return NULL; | |
| 794 | |
| 795 alias_node = varpool_node::create_alias (alias, decl); | |
| 796 alias_node->cpp_implicit_alias = true; | |
| 797 | |
| 798 /* Extra name alias mechanizm creates aliases really late | |
| 799 via DECL_ASSEMBLER_NAME mechanizm. | |
| 800 This is unfortunate because they are not going through the | |
| 801 standard channels. Ensure they get output. */ | |
| 802 if (symtab->cpp_implicit_aliases_done) | |
| 803 alias_node->resolve_alias (varpool_node::get_create (decl)); | |
| 804 return alias_node; | |
| 805 } | |
| 806 | |
| 807 /* Worker for call_for_symbol_and_aliases. */ | |
|
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808 |
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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809 bool |
| 111 | 810 varpool_node::call_for_symbol_and_aliases_1 (bool (*callback) (varpool_node *, |
| 811 void *), | |
| 812 void *data, | |
| 813 bool include_overwritable) | |
|
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parents:
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814 { |
| 111 | 815 ipa_ref *ref; |
|
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816 |
| 111 | 817 FOR_EACH_ALIAS (this, ref) |
| 818 { | |
| 819 varpool_node *alias = dyn_cast <varpool_node *> (ref->referring); | |
| 820 if (include_overwritable | |
| 821 || alias->get_availability () > AVAIL_INTERPOSABLE) | |
| 822 if (alias->call_for_symbol_and_aliases (callback, data, | |
| 823 include_overwritable)) | |
| 824 return true; | |
| 825 } | |
|
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826 return false; |
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827 } |