Mercurial > hg > CbC > CbC_gcc
annotate gcc/attribs.c @ 67:f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
| author | nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> |
|---|---|
| date | Tue, 22 Mar 2011 17:18:12 +0900 |
| parents | b7f97abdc517 |
| children | 04ced10e8804 |
| 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, 2010 |
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4 Free Software Foundation, Inc. |
| 0 | 5 |
| 6 This file is part of GCC. | |
| 7 | |
| 8 GCC is free software; you can redistribute it and/or modify it under | |
| 9 the terms of the GNU General Public License as published by the Free | |
| 10 Software Foundation; either version 3, or (at your option) any later | |
| 11 version. | |
| 12 | |
| 13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
| 14 WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 16 for more details. | |
| 17 | |
| 18 You should have received a copy of the GNU General Public License | |
| 19 along with GCC; see the file COPYING3. If not see | |
| 20 <http://www.gnu.org/licenses/>. */ | |
| 21 | |
| 22 #include "config.h" | |
| 23 #include "system.h" | |
| 24 #include "coretypes.h" | |
| 25 #include "tm.h" | |
| 26 #include "tree.h" | |
| 27 #include "flags.h" | |
|
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28 #include "diagnostic-core.h" |
| 0 | 29 #include "ggc.h" |
| 30 #include "tm_p.h" | |
| 31 #include "cpplib.h" | |
| 32 #include "target.h" | |
| 33 #include "langhooks.h" | |
| 34 #include "hashtab.h" | |
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35 #include "plugin.h" |
| 0 | 36 |
| 37 static void init_attributes (void); | |
| 38 | |
| 39 /* Table of the tables of attributes (common, language, format, machine) | |
| 40 searched. */ | |
| 41 static const struct attribute_spec *attribute_tables[4]; | |
| 42 | |
| 43 /* Hashtable mapping names (represented as substrings) to attribute specs. */ | |
| 44 static htab_t attribute_hash; | |
| 45 | |
| 46 /* Substring representation. */ | |
| 47 | |
| 48 struct substring | |
| 49 { | |
| 50 const char *str; | |
| 51 int length; | |
| 52 }; | |
| 53 | |
| 54 static bool attributes_initialized = false; | |
| 55 | |
| 56 /* Default empty table of attributes. */ | |
| 57 | |
| 58 static const struct attribute_spec empty_attribute_table[] = | |
| 59 { | |
| 60 { NULL, 0, 0, false, false, false, NULL } | |
| 61 }; | |
| 62 | |
| 63 /* Return base name of the attribute. Ie '__attr__' is turned into 'attr'. | |
| 64 To avoid need for copying, we simply return length of the string. */ | |
| 65 | |
| 66 static void | |
| 67 extract_attribute_substring (struct substring *str) | |
| 68 { | |
| 69 if (str->length > 4 && str->str[0] == '_' && str->str[1] == '_' | |
| 70 && str->str[str->length - 1] == '_' && str->str[str->length - 2] == '_') | |
| 71 { | |
| 72 str->length -= 4; | |
| 73 str->str += 2; | |
| 74 } | |
| 75 } | |
| 76 | |
| 77 /* Simple hash function to avoid need to scan whole string. */ | |
| 78 | |
| 79 static inline hashval_t | |
| 80 substring_hash (const char *str, int l) | |
| 81 { | |
| 82 return str[0] + str[l - 1] * 256 + l * 65536; | |
| 83 } | |
| 84 | |
| 85 /* Used for attribute_hash. */ | |
| 86 | |
| 87 static hashval_t | |
| 88 hash_attr (const void *p) | |
| 89 { | |
| 90 const struct attribute_spec *const spec = (const struct attribute_spec *) p; | |
| 91 const int l = strlen (spec->name); | |
| 92 | |
| 93 return substring_hash (spec->name, l); | |
| 94 } | |
| 95 | |
| 96 /* Used for attribute_hash. */ | |
| 97 | |
| 98 static int | |
| 99 eq_attr (const void *p, const void *q) | |
| 100 { | |
| 101 const struct attribute_spec *const spec = (const struct attribute_spec *) p; | |
| 102 const struct substring *const str = (const struct substring *) q; | |
| 103 | |
| 104 return (!strncmp (spec->name, str->str, str->length) && !spec->name[str->length]); | |
| 105 } | |
| 106 | |
| 107 /* Initialize attribute tables, and make some sanity checks | |
| 108 if --enable-checking. */ | |
| 109 | |
| 110 static void | |
| 111 init_attributes (void) | |
| 112 { | |
| 113 size_t i; | |
| 114 int k; | |
| 115 | |
| 116 attribute_tables[0] = lang_hooks.common_attribute_table; | |
| 117 attribute_tables[1] = lang_hooks.attribute_table; | |
| 118 attribute_tables[2] = lang_hooks.format_attribute_table; | |
| 119 attribute_tables[3] = targetm.attribute_table; | |
| 120 | |
| 121 /* Translate NULL pointers to pointers to the empty table. */ | |
| 122 for (i = 0; i < ARRAY_SIZE (attribute_tables); i++) | |
| 123 if (attribute_tables[i] == NULL) | |
| 124 attribute_tables[i] = empty_attribute_table; | |
| 125 | |
| 126 #ifdef ENABLE_CHECKING | |
| 127 /* Make some sanity checks on the attribute tables. */ | |
| 128 for (i = 0; i < ARRAY_SIZE (attribute_tables); i++) | |
| 129 { | |
| 130 int j; | |
| 131 | |
| 132 for (j = 0; attribute_tables[i][j].name != NULL; j++) | |
| 133 { | |
| 134 /* The name must not begin and end with __. */ | |
| 135 const char *name = attribute_tables[i][j].name; | |
| 136 int len = strlen (name); | |
| 137 | |
| 138 gcc_assert (!(name[0] == '_' && name[1] == '_' | |
| 139 && name[len - 1] == '_' && name[len - 2] == '_')); | |
| 140 | |
| 141 /* The minimum and maximum lengths must be consistent. */ | |
| 142 gcc_assert (attribute_tables[i][j].min_length >= 0); | |
| 143 | |
| 144 gcc_assert (attribute_tables[i][j].max_length == -1 | |
| 145 || (attribute_tables[i][j].max_length | |
| 146 >= attribute_tables[i][j].min_length)); | |
| 147 | |
| 148 /* An attribute cannot require both a DECL and a TYPE. */ | |
| 149 gcc_assert (!attribute_tables[i][j].decl_required | |
| 150 || !attribute_tables[i][j].type_required); | |
| 151 | |
| 152 /* If an attribute requires a function type, in particular | |
| 153 it requires a type. */ | |
| 154 gcc_assert (!attribute_tables[i][j].function_type_required | |
| 155 || attribute_tables[i][j].type_required); | |
| 156 } | |
| 157 } | |
| 158 | |
| 159 /* Check that each name occurs just once in each table. */ | |
| 160 for (i = 0; i < ARRAY_SIZE (attribute_tables); i++) | |
| 161 { | |
| 162 int j, k; | |
| 163 for (j = 0; attribute_tables[i][j].name != NULL; j++) | |
| 164 for (k = j + 1; attribute_tables[i][k].name != NULL; k++) | |
| 165 gcc_assert (strcmp (attribute_tables[i][j].name, | |
| 166 attribute_tables[i][k].name)); | |
| 167 } | |
| 168 /* Check that no name occurs in more than one table. */ | |
| 169 for (i = 0; i < ARRAY_SIZE (attribute_tables); i++) | |
| 170 { | |
| 171 size_t j, k, l; | |
| 172 | |
| 173 for (j = i + 1; j < ARRAY_SIZE (attribute_tables); j++) | |
| 174 for (k = 0; attribute_tables[i][k].name != NULL; k++) | |
| 175 for (l = 0; attribute_tables[j][l].name != NULL; l++) | |
| 176 gcc_assert (strcmp (attribute_tables[i][k].name, | |
| 177 attribute_tables[j][l].name)); | |
| 178 } | |
| 179 #endif | |
| 180 | |
| 181 attribute_hash = htab_create (200, hash_attr, eq_attr, NULL); | |
| 182 for (i = 0; i < ARRAY_SIZE (attribute_tables); i++) | |
| 183 for (k = 0; attribute_tables[i][k].name != NULL; k++) | |
| 184 { | |
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185 register_attribute (&attribute_tables[i][k]); |
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186 } |
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187 invoke_plugin_callbacks (PLUGIN_ATTRIBUTES, NULL); |
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188 attributes_initialized = true; |
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189 } |
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190 |
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191 /* Insert a single ATTR into the attribute table. */ |
| 0 | 192 |
|
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193 void |
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194 register_attribute (const struct attribute_spec *attr) |
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195 { |
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196 struct substring str; |
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197 void **slot; |
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198 |
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199 str.str = attr->name; |
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200 str.length = strlen (str.str); |
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201 slot = htab_find_slot_with_hash (attribute_hash, &str, |
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202 substring_hash (str.str, str.length), |
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203 INSERT); |
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204 gcc_assert (!*slot); |
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205 *slot = (void *) CONST_CAST (struct attribute_spec *, attr); |
| 0 | 206 } |
| 207 | |
| 208 /* Return the spec for the attribute named NAME. */ | |
| 209 | |
| 210 const struct attribute_spec * | |
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211 lookup_attribute_spec (const_tree name) |
| 0 | 212 { |
| 213 struct substring attr; | |
| 214 | |
| 215 attr.str = IDENTIFIER_POINTER (name); | |
| 216 attr.length = IDENTIFIER_LENGTH (name); | |
| 217 extract_attribute_substring (&attr); | |
| 218 return (const struct attribute_spec *) | |
| 219 htab_find_with_hash (attribute_hash, &attr, | |
| 220 substring_hash (attr.str, attr.length)); | |
| 221 } | |
| 222 | |
| 223 /* Process the attributes listed in ATTRIBUTES and install them in *NODE, | |
| 224 which is either a DECL (including a TYPE_DECL) or a TYPE. If a DECL, | |
| 225 it should be modified in place; if a TYPE, a copy should be created | |
| 226 unless ATTR_FLAG_TYPE_IN_PLACE is set in FLAGS. FLAGS gives further | |
| 227 information, in the form of a bitwise OR of flags in enum attribute_flags | |
| 228 from tree.h. Depending on these flags, some attributes may be | |
| 229 returned to be applied at a later stage (for example, to apply | |
| 230 a decl attribute to the declaration rather than to its type). */ | |
| 231 | |
| 232 tree | |
| 233 decl_attributes (tree *node, tree attributes, int flags) | |
| 234 { | |
| 235 tree a; | |
| 236 tree returned_attrs = NULL_TREE; | |
| 237 | |
| 238 if (TREE_TYPE (*node) == error_mark_node) | |
| 239 return NULL_TREE; | |
| 240 | |
| 241 if (!attributes_initialized) | |
| 242 init_attributes (); | |
| 243 | |
| 244 /* If this is a function and the user used #pragma GCC optimize, add the | |
| 245 options to the attribute((optimize(...))) list. */ | |
| 246 if (TREE_CODE (*node) == FUNCTION_DECL && current_optimize_pragma) | |
| 247 { | |
| 248 tree cur_attr = lookup_attribute ("optimize", attributes); | |
| 249 tree opts = copy_list (current_optimize_pragma); | |
| 250 | |
| 251 if (! cur_attr) | |
| 252 attributes | |
| 253 = tree_cons (get_identifier ("optimize"), opts, attributes); | |
| 254 else | |
| 255 TREE_VALUE (cur_attr) = chainon (opts, TREE_VALUE (cur_attr)); | |
| 256 } | |
| 257 | |
| 258 if (TREE_CODE (*node) == FUNCTION_DECL | |
| 259 && optimization_current_node != optimization_default_node | |
| 260 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (*node)) | |
| 261 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (*node) = optimization_current_node; | |
| 262 | |
| 263 /* If this is a function and the user used #pragma GCC target, add the | |
| 264 options to the attribute((target(...))) list. */ | |
| 265 if (TREE_CODE (*node) == FUNCTION_DECL | |
| 266 && current_target_pragma | |
| 267 && targetm.target_option.valid_attribute_p (*node, NULL_TREE, | |
| 268 current_target_pragma, 0)) | |
| 269 { | |
| 270 tree cur_attr = lookup_attribute ("target", attributes); | |
| 271 tree opts = copy_list (current_target_pragma); | |
| 272 | |
| 273 if (! cur_attr) | |
| 274 attributes = tree_cons (get_identifier ("target"), opts, attributes); | |
| 275 else | |
| 276 TREE_VALUE (cur_attr) = chainon (opts, TREE_VALUE (cur_attr)); | |
| 277 } | |
| 278 | |
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279 /* A "naked" function attribute implies "noinline" and "noclone" for |
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280 those targets that support it. */ |
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281 if (TREE_CODE (*node) == FUNCTION_DECL |
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282 && lookup_attribute_spec (get_identifier ("naked")) |
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283 && lookup_attribute ("naked", attributes) != NULL) |
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284 { |
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285 if (lookup_attribute ("noinline", attributes) == NULL) |
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286 attributes = tree_cons (get_identifier ("noinline"), NULL, attributes); |
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287 |
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288 if (lookup_attribute ("noclone", attributes) == NULL) |
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289 attributes = tree_cons (get_identifier ("noclone"), NULL, attributes); |
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290 } |
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291 |
| 0 | 292 targetm.insert_attributes (*node, &attributes); |
| 293 | |
| 294 for (a = attributes; a; a = TREE_CHAIN (a)) | |
| 295 { | |
| 296 tree name = TREE_PURPOSE (a); | |
| 297 tree args = TREE_VALUE (a); | |
| 298 tree *anode = node; | |
| 299 const struct attribute_spec *spec = lookup_attribute_spec (name); | |
| 300 bool no_add_attrs = 0; | |
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301 int fn_ptr_quals = 0; |
| 0 | 302 tree fn_ptr_tmp = NULL_TREE; |
| 303 | |
| 304 if (spec == NULL) | |
| 305 { | |
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306 warning (OPT_Wattributes, "%qE attribute directive ignored", |
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307 name); |
| 0 | 308 continue; |
| 309 } | |
| 310 else if (list_length (args) < spec->min_length | |
| 311 || (spec->max_length >= 0 | |
| 312 && list_length (args) > spec->max_length)) | |
| 313 { | |
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314 error ("wrong number of arguments specified for %qE attribute", |
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315 name); |
| 0 | 316 continue; |
| 317 } | |
| 318 gcc_assert (is_attribute_p (spec->name, name)); | |
| 319 | |
| 320 if (spec->decl_required && !DECL_P (*anode)) | |
| 321 { | |
| 322 if (flags & ((int) ATTR_FLAG_DECL_NEXT | |
| 323 | (int) ATTR_FLAG_FUNCTION_NEXT | |
| 324 | (int) ATTR_FLAG_ARRAY_NEXT)) | |
| 325 { | |
| 326 /* Pass on this attribute to be tried again. */ | |
| 327 returned_attrs = tree_cons (name, args, returned_attrs); | |
| 328 continue; | |
| 329 } | |
| 330 else | |
| 331 { | |
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332 warning (OPT_Wattributes, "%qE attribute does not apply to types", |
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333 name); |
| 0 | 334 continue; |
| 335 } | |
| 336 } | |
| 337 | |
| 338 /* If we require a type, but were passed a decl, set up to make a | |
| 339 new type and update the one in the decl. ATTR_FLAG_TYPE_IN_PLACE | |
| 340 would have applied if we'd been passed a type, but we cannot modify | |
| 341 the decl's type in place here. */ | |
| 342 if (spec->type_required && DECL_P (*anode)) | |
| 343 { | |
| 344 anode = &TREE_TYPE (*anode); | |
| 345 /* Allow ATTR_FLAG_TYPE_IN_PLACE for the type's naming decl. */ | |
| 346 if (!(TREE_CODE (*anode) == TYPE_DECL | |
| 347 && *anode == TYPE_NAME (TYPE_MAIN_VARIANT | |
| 348 (TREE_TYPE (*anode))))) | |
| 349 flags &= ~(int) ATTR_FLAG_TYPE_IN_PLACE; | |
| 350 } | |
| 351 | |
| 352 if (spec->function_type_required && TREE_CODE (*anode) != FUNCTION_TYPE | |
| 353 && TREE_CODE (*anode) != METHOD_TYPE) | |
| 354 { | |
| 355 if (TREE_CODE (*anode) == POINTER_TYPE | |
| 356 && (TREE_CODE (TREE_TYPE (*anode)) == FUNCTION_TYPE | |
| 357 || TREE_CODE (TREE_TYPE (*anode)) == METHOD_TYPE)) | |
| 358 { | |
| 359 /* OK, this is a bit convoluted. We can't just make a copy | |
| 360 of the pointer type and modify its TREE_TYPE, because if | |
| 361 we change the attributes of the target type the pointer | |
| 362 type needs to have a different TYPE_MAIN_VARIANT. So we | |
| 363 pull out the target type now, frob it as appropriate, and | |
| 364 rebuild the pointer type later. | |
| 365 | |
| 366 This would all be simpler if attributes were part of the | |
| 367 declarator, grumble grumble. */ | |
| 368 fn_ptr_tmp = TREE_TYPE (*anode); | |
|
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369 fn_ptr_quals = TYPE_QUALS (*anode); |
| 0 | 370 anode = &fn_ptr_tmp; |
| 371 flags &= ~(int) ATTR_FLAG_TYPE_IN_PLACE; | |
| 372 } | |
| 373 else if (flags & (int) ATTR_FLAG_FUNCTION_NEXT) | |
| 374 { | |
| 375 /* Pass on this attribute to be tried again. */ | |
| 376 returned_attrs = tree_cons (name, args, returned_attrs); | |
| 377 continue; | |
| 378 } | |
| 379 | |
| 380 if (TREE_CODE (*anode) != FUNCTION_TYPE | |
| 381 && TREE_CODE (*anode) != METHOD_TYPE) | |
| 382 { | |
| 383 warning (OPT_Wattributes, | |
|
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384 "%qE attribute only applies to function types", |
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385 name); |
| 0 | 386 continue; |
| 387 } | |
| 388 } | |
| 389 | |
| 390 if (TYPE_P (*anode) | |
| 391 && (flags & (int) ATTR_FLAG_TYPE_IN_PLACE) | |
| 392 && TYPE_SIZE (*anode) != NULL_TREE) | |
| 393 { | |
| 394 warning (OPT_Wattributes, "type attributes ignored after type is already defined"); | |
| 395 continue; | |
| 396 } | |
| 397 | |
| 398 if (spec->handler != NULL) | |
| 399 returned_attrs = chainon ((*spec->handler) (anode, name, args, | |
| 400 flags, &no_add_attrs), | |
| 401 returned_attrs); | |
| 402 | |
| 403 /* Layout the decl in case anything changed. */ | |
| 404 if (spec->type_required && DECL_P (*node) | |
| 405 && (TREE_CODE (*node) == VAR_DECL | |
| 406 || TREE_CODE (*node) == PARM_DECL | |
| 407 || TREE_CODE (*node) == RESULT_DECL)) | |
| 408 relayout_decl (*node); | |
| 409 | |
| 410 if (!no_add_attrs) | |
| 411 { | |
| 412 tree old_attrs; | |
| 413 tree a; | |
| 414 | |
| 415 if (DECL_P (*anode)) | |
| 416 old_attrs = DECL_ATTRIBUTES (*anode); | |
| 417 else | |
| 418 old_attrs = TYPE_ATTRIBUTES (*anode); | |
| 419 | |
| 420 for (a = lookup_attribute (spec->name, old_attrs); | |
| 421 a != NULL_TREE; | |
| 422 a = lookup_attribute (spec->name, TREE_CHAIN (a))) | |
| 423 { | |
| 424 if (simple_cst_equal (TREE_VALUE (a), args) == 1) | |
| 425 break; | |
| 426 } | |
| 427 | |
| 428 if (a == NULL_TREE) | |
| 429 { | |
| 430 /* This attribute isn't already in the list. */ | |
| 431 if (DECL_P (*anode)) | |
| 432 DECL_ATTRIBUTES (*anode) = tree_cons (name, args, old_attrs); | |
| 433 else if (flags & (int) ATTR_FLAG_TYPE_IN_PLACE) | |
| 434 { | |
| 435 TYPE_ATTRIBUTES (*anode) = tree_cons (name, args, old_attrs); | |
| 436 /* If this is the main variant, also push the attributes | |
| 437 out to the other variants. */ | |
| 438 if (*anode == TYPE_MAIN_VARIANT (*anode)) | |
| 439 { | |
| 440 tree variant; | |
| 441 for (variant = *anode; variant; | |
| 442 variant = TYPE_NEXT_VARIANT (variant)) | |
| 443 { | |
| 444 if (TYPE_ATTRIBUTES (variant) == old_attrs) | |
| 445 TYPE_ATTRIBUTES (variant) | |
| 446 = TYPE_ATTRIBUTES (*anode); | |
| 447 else if (!lookup_attribute | |
| 448 (spec->name, TYPE_ATTRIBUTES (variant))) | |
| 449 TYPE_ATTRIBUTES (variant) = tree_cons | |
| 450 (name, args, TYPE_ATTRIBUTES (variant)); | |
| 451 } | |
| 452 } | |
| 453 } | |
| 454 else | |
| 455 *anode = build_type_attribute_variant (*anode, | |
| 456 tree_cons (name, args, | |
| 457 old_attrs)); | |
| 458 } | |
| 459 } | |
| 460 | |
| 461 if (fn_ptr_tmp) | |
| 462 { | |
| 463 /* Rebuild the function pointer type and put it in the | |
| 464 appropriate place. */ | |
| 465 fn_ptr_tmp = build_pointer_type (fn_ptr_tmp); | |
|
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466 if (fn_ptr_quals) |
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467 fn_ptr_tmp = build_qualified_type (fn_ptr_tmp, fn_ptr_quals); |
| 0 | 468 if (DECL_P (*node)) |
| 469 TREE_TYPE (*node) = fn_ptr_tmp; | |
| 470 else | |
| 471 { | |
| 472 gcc_assert (TREE_CODE (*node) == POINTER_TYPE); | |
| 473 *node = fn_ptr_tmp; | |
| 474 } | |
| 475 } | |
| 476 } | |
| 477 | |
| 478 return returned_attrs; | |
| 479 } |