Mercurial > hg > CbC > CbC_gcc
annotate gcc/attribs.c @ 55:77e2b8dfacca gcc-4.4.5
update it from 4.4.3 to 4.5.0
| author | ryoma <e075725@ie.u-ryukyu.ac.jp> |
|---|---|
| date | Fri, 12 Feb 2010 23:39:51 +0900 |
| parents | a06113de4d67 |
| children | b7f97abdc517 |
| rev | line source |
|---|---|
| 0 | 1 /* Functions dealing with attribute handling, used by most front ends. |
| 2 Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, | |
|
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3 2002, 2003, 2004, 2005, 2007, 2008, 2009 Free Software Foundation, Inc. |
| 0 | 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" | |
| 24 #include "tm.h" | |
| 25 #include "tree.h" | |
| 26 #include "flags.h" | |
| 27 #include "toplev.h" | |
| 28 #include "output.h" | |
| 29 #include "rtl.h" | |
| 30 #include "ggc.h" | |
| 31 #include "tm_p.h" | |
| 32 #include "cpplib.h" | |
| 33 #include "target.h" | |
| 34 #include "langhooks.h" | |
| 35 #include "hashtab.h" | |
|
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36 #include "plugin.h" |
| 0 | 37 |
| 38 static void init_attributes (void); | |
| 39 | |
| 40 /* Table of the tables of attributes (common, language, format, machine) | |
| 41 searched. */ | |
| 42 static const struct attribute_spec *attribute_tables[4]; | |
| 43 | |
| 44 /* Hashtable mapping names (represented as substrings) to attribute specs. */ | |
| 45 static htab_t attribute_hash; | |
| 46 | |
| 47 /* Substring representation. */ | |
| 48 | |
| 49 struct substring | |
| 50 { | |
| 51 const char *str; | |
| 52 int length; | |
| 53 }; | |
| 54 | |
| 55 static bool attributes_initialized = false; | |
| 56 | |
| 57 /* Default empty table of attributes. */ | |
| 58 | |
| 59 static const struct attribute_spec empty_attribute_table[] = | |
| 60 { | |
| 61 { NULL, 0, 0, false, false, false, NULL } | |
| 62 }; | |
| 63 | |
| 64 /* Return base name of the attribute. Ie '__attr__' is turned into 'attr'. | |
| 65 To avoid need for copying, we simply return length of the string. */ | |
| 66 | |
| 67 static void | |
| 68 extract_attribute_substring (struct substring *str) | |
| 69 { | |
| 70 if (str->length > 4 && str->str[0] == '_' && str->str[1] == '_' | |
| 71 && str->str[str->length - 1] == '_' && str->str[str->length - 2] == '_') | |
| 72 { | |
| 73 str->length -= 4; | |
| 74 str->str += 2; | |
| 75 } | |
| 76 } | |
| 77 | |
| 78 /* Simple hash function to avoid need to scan whole string. */ | |
| 79 | |
| 80 static inline hashval_t | |
| 81 substring_hash (const char *str, int l) | |
| 82 { | |
| 83 return str[0] + str[l - 1] * 256 + l * 65536; | |
| 84 } | |
| 85 | |
| 86 /* Used for attribute_hash. */ | |
| 87 | |
| 88 static hashval_t | |
| 89 hash_attr (const void *p) | |
| 90 { | |
| 91 const struct attribute_spec *const spec = (const struct attribute_spec *) p; | |
| 92 const int l = strlen (spec->name); | |
| 93 | |
| 94 return substring_hash (spec->name, l); | |
| 95 } | |
| 96 | |
| 97 /* Used for attribute_hash. */ | |
| 98 | |
| 99 static int | |
| 100 eq_attr (const void *p, const void *q) | |
| 101 { | |
| 102 const struct attribute_spec *const spec = (const struct attribute_spec *) p; | |
| 103 const struct substring *const str = (const struct substring *) q; | |
| 104 | |
| 105 return (!strncmp (spec->name, str->str, str->length) && !spec->name[str->length]); | |
| 106 } | |
| 107 | |
| 108 /* Initialize attribute tables, and make some sanity checks | |
| 109 if --enable-checking. */ | |
| 110 | |
| 111 static void | |
| 112 init_attributes (void) | |
| 113 { | |
| 114 size_t i; | |
| 115 int k; | |
| 116 | |
| 117 attribute_tables[0] = lang_hooks.common_attribute_table; | |
| 118 attribute_tables[1] = lang_hooks.attribute_table; | |
| 119 attribute_tables[2] = lang_hooks.format_attribute_table; | |
| 120 attribute_tables[3] = targetm.attribute_table; | |
| 121 | |
| 122 /* Translate NULL pointers to pointers to the empty table. */ | |
| 123 for (i = 0; i < ARRAY_SIZE (attribute_tables); i++) | |
| 124 if (attribute_tables[i] == NULL) | |
| 125 attribute_tables[i] = empty_attribute_table; | |
| 126 | |
| 127 #ifdef ENABLE_CHECKING | |
| 128 /* Make some sanity checks on the attribute tables. */ | |
| 129 for (i = 0; i < ARRAY_SIZE (attribute_tables); i++) | |
| 130 { | |
| 131 int j; | |
| 132 | |
| 133 for (j = 0; attribute_tables[i][j].name != NULL; j++) | |
| 134 { | |
| 135 /* The name must not begin and end with __. */ | |
| 136 const char *name = attribute_tables[i][j].name; | |
| 137 int len = strlen (name); | |
| 138 | |
| 139 gcc_assert (!(name[0] == '_' && name[1] == '_' | |
| 140 && name[len - 1] == '_' && name[len - 2] == '_')); | |
| 141 | |
| 142 /* The minimum and maximum lengths must be consistent. */ | |
| 143 gcc_assert (attribute_tables[i][j].min_length >= 0); | |
| 144 | |
| 145 gcc_assert (attribute_tables[i][j].max_length == -1 | |
| 146 || (attribute_tables[i][j].max_length | |
| 147 >= attribute_tables[i][j].min_length)); | |
| 148 | |
| 149 /* An attribute cannot require both a DECL and a TYPE. */ | |
| 150 gcc_assert (!attribute_tables[i][j].decl_required | |
| 151 || !attribute_tables[i][j].type_required); | |
| 152 | |
| 153 /* If an attribute requires a function type, in particular | |
| 154 it requires a type. */ | |
| 155 gcc_assert (!attribute_tables[i][j].function_type_required | |
| 156 || attribute_tables[i][j].type_required); | |
| 157 } | |
| 158 } | |
| 159 | |
| 160 /* Check that each name occurs just once in each table. */ | |
| 161 for (i = 0; i < ARRAY_SIZE (attribute_tables); i++) | |
| 162 { | |
| 163 int j, k; | |
| 164 for (j = 0; attribute_tables[i][j].name != NULL; j++) | |
| 165 for (k = j + 1; attribute_tables[i][k].name != NULL; k++) | |
| 166 gcc_assert (strcmp (attribute_tables[i][j].name, | |
| 167 attribute_tables[i][k].name)); | |
| 168 } | |
| 169 /* Check that no name occurs in more than one table. */ | |
| 170 for (i = 0; i < ARRAY_SIZE (attribute_tables); i++) | |
| 171 { | |
| 172 size_t j, k, l; | |
| 173 | |
| 174 for (j = i + 1; j < ARRAY_SIZE (attribute_tables); j++) | |
| 175 for (k = 0; attribute_tables[i][k].name != NULL; k++) | |
| 176 for (l = 0; attribute_tables[j][l].name != NULL; l++) | |
| 177 gcc_assert (strcmp (attribute_tables[i][k].name, | |
| 178 attribute_tables[j][l].name)); | |
| 179 } | |
| 180 #endif | |
| 181 | |
| 182 attribute_hash = htab_create (200, hash_attr, eq_attr, NULL); | |
| 183 for (i = 0; i < ARRAY_SIZE (attribute_tables); i++) | |
| 184 for (k = 0; attribute_tables[i][k].name != NULL; k++) | |
| 185 { | |
|
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186 register_attribute (&attribute_tables[i][k]); |
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187 } |
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188 invoke_plugin_callbacks (PLUGIN_ATTRIBUTES, NULL); |
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189 attributes_initialized = true; |
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190 } |
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191 |
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192 /* Insert a single ATTR into the attribute table. */ |
| 0 | 193 |
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194 void |
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195 register_attribute (const struct attribute_spec *attr) |
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196 { |
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197 struct substring str; |
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198 void **slot; |
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199 |
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200 str.str = attr->name; |
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201 str.length = strlen (str.str); |
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202 slot = htab_find_slot_with_hash (attribute_hash, &str, |
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203 substring_hash (str.str, str.length), |
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204 INSERT); |
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205 gcc_assert (!*slot); |
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206 *slot = (void *) CONST_CAST (struct attribute_spec *, attr); |
| 0 | 207 } |
| 208 | |
| 209 /* Return the spec for the attribute named NAME. */ | |
| 210 | |
| 211 const struct attribute_spec * | |
| 212 lookup_attribute_spec (tree name) | |
| 213 { | |
| 214 struct substring attr; | |
| 215 | |
| 216 attr.str = IDENTIFIER_POINTER (name); | |
| 217 attr.length = IDENTIFIER_LENGTH (name); | |
| 218 extract_attribute_substring (&attr); | |
| 219 return (const struct attribute_spec *) | |
| 220 htab_find_with_hash (attribute_hash, &attr, | |
| 221 substring_hash (attr.str, attr.length)); | |
| 222 } | |
| 223 | |
| 224 /* Process the attributes listed in ATTRIBUTES and install them in *NODE, | |
| 225 which is either a DECL (including a TYPE_DECL) or a TYPE. If a DECL, | |
| 226 it should be modified in place; if a TYPE, a copy should be created | |
| 227 unless ATTR_FLAG_TYPE_IN_PLACE is set in FLAGS. FLAGS gives further | |
| 228 information, in the form of a bitwise OR of flags in enum attribute_flags | |
| 229 from tree.h. Depending on these flags, some attributes may be | |
| 230 returned to be applied at a later stage (for example, to apply | |
| 231 a decl attribute to the declaration rather than to its type). */ | |
| 232 | |
| 233 tree | |
| 234 decl_attributes (tree *node, tree attributes, int flags) | |
| 235 { | |
| 236 tree a; | |
| 237 tree returned_attrs = NULL_TREE; | |
| 238 | |
| 239 if (TREE_TYPE (*node) == error_mark_node) | |
| 240 return NULL_TREE; | |
| 241 | |
| 242 if (!attributes_initialized) | |
| 243 init_attributes (); | |
| 244 | |
| 245 /* If this is a function and the user used #pragma GCC optimize, add the | |
| 246 options to the attribute((optimize(...))) list. */ | |
| 247 if (TREE_CODE (*node) == FUNCTION_DECL && current_optimize_pragma) | |
| 248 { | |
| 249 tree cur_attr = lookup_attribute ("optimize", attributes); | |
| 250 tree opts = copy_list (current_optimize_pragma); | |
| 251 | |
| 252 if (! cur_attr) | |
| 253 attributes | |
| 254 = tree_cons (get_identifier ("optimize"), opts, attributes); | |
| 255 else | |
| 256 TREE_VALUE (cur_attr) = chainon (opts, TREE_VALUE (cur_attr)); | |
| 257 } | |
| 258 | |
| 259 if (TREE_CODE (*node) == FUNCTION_DECL | |
| 260 && optimization_current_node != optimization_default_node | |
| 261 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (*node)) | |
| 262 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (*node) = optimization_current_node; | |
| 263 | |
| 264 /* If this is a function and the user used #pragma GCC target, add the | |
| 265 options to the attribute((target(...))) list. */ | |
| 266 if (TREE_CODE (*node) == FUNCTION_DECL | |
| 267 && current_target_pragma | |
| 268 && targetm.target_option.valid_attribute_p (*node, NULL_TREE, | |
| 269 current_target_pragma, 0)) | |
| 270 { | |
| 271 tree cur_attr = lookup_attribute ("target", attributes); | |
| 272 tree opts = copy_list (current_target_pragma); | |
| 273 | |
| 274 if (! cur_attr) | |
| 275 attributes = tree_cons (get_identifier ("target"), opts, attributes); | |
| 276 else | |
| 277 TREE_VALUE (cur_attr) = chainon (opts, TREE_VALUE (cur_attr)); | |
| 278 } | |
| 279 | |
| 280 targetm.insert_attributes (*node, &attributes); | |
| 281 | |
| 282 for (a = attributes; a; a = TREE_CHAIN (a)) | |
| 283 { | |
| 284 tree name = TREE_PURPOSE (a); | |
| 285 tree args = TREE_VALUE (a); | |
| 286 tree *anode = node; | |
| 287 const struct attribute_spec *spec = lookup_attribute_spec (name); | |
| 288 bool no_add_attrs = 0; | |
| 289 tree fn_ptr_tmp = NULL_TREE; | |
| 290 | |
| 291 if (spec == NULL) | |
| 292 { | |
|
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293 warning (OPT_Wattributes, "%qE attribute directive ignored", |
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294 name); |
| 0 | 295 continue; |
| 296 } | |
| 297 else if (list_length (args) < spec->min_length | |
| 298 || (spec->max_length >= 0 | |
| 299 && list_length (args) > spec->max_length)) | |
| 300 { | |
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301 error ("wrong number of arguments specified for %qE attribute", |
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302 name); |
| 0 | 303 continue; |
| 304 } | |
| 305 gcc_assert (is_attribute_p (spec->name, name)); | |
| 306 | |
| 307 if (spec->decl_required && !DECL_P (*anode)) | |
| 308 { | |
| 309 if (flags & ((int) ATTR_FLAG_DECL_NEXT | |
| 310 | (int) ATTR_FLAG_FUNCTION_NEXT | |
| 311 | (int) ATTR_FLAG_ARRAY_NEXT)) | |
| 312 { | |
| 313 /* Pass on this attribute to be tried again. */ | |
| 314 returned_attrs = tree_cons (name, args, returned_attrs); | |
| 315 continue; | |
| 316 } | |
| 317 else | |
| 318 { | |
|
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319 warning (OPT_Wattributes, "%qE attribute does not apply to types", |
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320 name); |
| 0 | 321 continue; |
| 322 } | |
| 323 } | |
| 324 | |
| 325 /* If we require a type, but were passed a decl, set up to make a | |
| 326 new type and update the one in the decl. ATTR_FLAG_TYPE_IN_PLACE | |
| 327 would have applied if we'd been passed a type, but we cannot modify | |
| 328 the decl's type in place here. */ | |
| 329 if (spec->type_required && DECL_P (*anode)) | |
| 330 { | |
| 331 anode = &TREE_TYPE (*anode); | |
| 332 /* Allow ATTR_FLAG_TYPE_IN_PLACE for the type's naming decl. */ | |
| 333 if (!(TREE_CODE (*anode) == TYPE_DECL | |
| 334 && *anode == TYPE_NAME (TYPE_MAIN_VARIANT | |
| 335 (TREE_TYPE (*anode))))) | |
| 336 flags &= ~(int) ATTR_FLAG_TYPE_IN_PLACE; | |
| 337 } | |
| 338 | |
| 339 if (spec->function_type_required && TREE_CODE (*anode) != FUNCTION_TYPE | |
| 340 && TREE_CODE (*anode) != METHOD_TYPE) | |
| 341 { | |
| 342 if (TREE_CODE (*anode) == POINTER_TYPE | |
| 343 && (TREE_CODE (TREE_TYPE (*anode)) == FUNCTION_TYPE | |
| 344 || TREE_CODE (TREE_TYPE (*anode)) == METHOD_TYPE)) | |
| 345 { | |
| 346 /* OK, this is a bit convoluted. We can't just make a copy | |
| 347 of the pointer type and modify its TREE_TYPE, because if | |
| 348 we change the attributes of the target type the pointer | |
| 349 type needs to have a different TYPE_MAIN_VARIANT. So we | |
| 350 pull out the target type now, frob it as appropriate, and | |
| 351 rebuild the pointer type later. | |
| 352 | |
| 353 This would all be simpler if attributes were part of the | |
| 354 declarator, grumble grumble. */ | |
| 355 fn_ptr_tmp = TREE_TYPE (*anode); | |
| 356 anode = &fn_ptr_tmp; | |
| 357 flags &= ~(int) ATTR_FLAG_TYPE_IN_PLACE; | |
| 358 } | |
| 359 else if (flags & (int) ATTR_FLAG_FUNCTION_NEXT) | |
| 360 { | |
| 361 /* Pass on this attribute to be tried again. */ | |
| 362 returned_attrs = tree_cons (name, args, returned_attrs); | |
| 363 continue; | |
| 364 } | |
| 365 | |
| 366 if (TREE_CODE (*anode) != FUNCTION_TYPE | |
| 367 && TREE_CODE (*anode) != METHOD_TYPE) | |
| 368 { | |
| 369 warning (OPT_Wattributes, | |
|
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370 "%qE attribute only applies to function types", |
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371 name); |
| 0 | 372 continue; |
| 373 } | |
| 374 } | |
| 375 | |
| 376 if (TYPE_P (*anode) | |
| 377 && (flags & (int) ATTR_FLAG_TYPE_IN_PLACE) | |
| 378 && TYPE_SIZE (*anode) != NULL_TREE) | |
| 379 { | |
| 380 warning (OPT_Wattributes, "type attributes ignored after type is already defined"); | |
| 381 continue; | |
| 382 } | |
| 383 | |
| 384 if (spec->handler != NULL) | |
| 385 returned_attrs = chainon ((*spec->handler) (anode, name, args, | |
| 386 flags, &no_add_attrs), | |
| 387 returned_attrs); | |
| 388 | |
| 389 /* Layout the decl in case anything changed. */ | |
| 390 if (spec->type_required && DECL_P (*node) | |
| 391 && (TREE_CODE (*node) == VAR_DECL | |
| 392 || TREE_CODE (*node) == PARM_DECL | |
| 393 || TREE_CODE (*node) == RESULT_DECL)) | |
| 394 relayout_decl (*node); | |
| 395 | |
| 396 if (!no_add_attrs) | |
| 397 { | |
| 398 tree old_attrs; | |
| 399 tree a; | |
| 400 | |
| 401 if (DECL_P (*anode)) | |
| 402 old_attrs = DECL_ATTRIBUTES (*anode); | |
| 403 else | |
| 404 old_attrs = TYPE_ATTRIBUTES (*anode); | |
| 405 | |
| 406 for (a = lookup_attribute (spec->name, old_attrs); | |
| 407 a != NULL_TREE; | |
| 408 a = lookup_attribute (spec->name, TREE_CHAIN (a))) | |
| 409 { | |
| 410 if (simple_cst_equal (TREE_VALUE (a), args) == 1) | |
| 411 break; | |
| 412 } | |
| 413 | |
| 414 if (a == NULL_TREE) | |
| 415 { | |
| 416 /* This attribute isn't already in the list. */ | |
| 417 if (DECL_P (*anode)) | |
| 418 DECL_ATTRIBUTES (*anode) = tree_cons (name, args, old_attrs); | |
| 419 else if (flags & (int) ATTR_FLAG_TYPE_IN_PLACE) | |
| 420 { | |
| 421 TYPE_ATTRIBUTES (*anode) = tree_cons (name, args, old_attrs); | |
| 422 /* If this is the main variant, also push the attributes | |
| 423 out to the other variants. */ | |
| 424 if (*anode == TYPE_MAIN_VARIANT (*anode)) | |
| 425 { | |
| 426 tree variant; | |
| 427 for (variant = *anode; variant; | |
| 428 variant = TYPE_NEXT_VARIANT (variant)) | |
| 429 { | |
| 430 if (TYPE_ATTRIBUTES (variant) == old_attrs) | |
| 431 TYPE_ATTRIBUTES (variant) | |
| 432 = TYPE_ATTRIBUTES (*anode); | |
| 433 else if (!lookup_attribute | |
| 434 (spec->name, TYPE_ATTRIBUTES (variant))) | |
| 435 TYPE_ATTRIBUTES (variant) = tree_cons | |
| 436 (name, args, TYPE_ATTRIBUTES (variant)); | |
| 437 } | |
| 438 } | |
| 439 } | |
| 440 else | |
| 441 *anode = build_type_attribute_variant (*anode, | |
| 442 tree_cons (name, args, | |
| 443 old_attrs)); | |
| 444 } | |
| 445 } | |
| 446 | |
| 447 if (fn_ptr_tmp) | |
| 448 { | |
| 449 /* Rebuild the function pointer type and put it in the | |
| 450 appropriate place. */ | |
| 451 fn_ptr_tmp = build_pointer_type (fn_ptr_tmp); | |
| 452 if (DECL_P (*node)) | |
| 453 TREE_TYPE (*node) = fn_ptr_tmp; | |
| 454 else | |
| 455 { | |
| 456 gcc_assert (TREE_CODE (*node) == POINTER_TYPE); | |
| 457 *node = fn_ptr_tmp; | |
| 458 } | |
| 459 } | |
| 460 } | |
| 461 | |
| 462 return returned_attrs; | |
| 463 } |