Mercurial > hg > CbC > CbC_gcc
annotate gcc/attribs.c @ 63:b7f97abdc517 gcc-4.6-20100522
update gcc from gcc-4.5.0 to gcc-4.6
author | ryoma <e075725@ie.u-ryukyu.ac.jp> |
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date | Mon, 24 May 2010 12:47:05 +0900 |
parents | 77e2b8dfacca |
children | f6334be47118 |
rev | line source |
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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, | |
63
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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" | |
28 #include "toplev.h" | |
29 #include "output.h" | |
30 #include "rtl.h" | |
31 #include "ggc.h" | |
32 #include "tm_p.h" | |
33 #include "cpplib.h" | |
34 #include "target.h" | |
35 #include "langhooks.h" | |
36 #include "hashtab.h" | |
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37 #include "plugin.h" |
0 | 38 |
39 static void init_attributes (void); | |
40 | |
41 /* Table of the tables of attributes (common, language, format, machine) | |
42 searched. */ | |
43 static const struct attribute_spec *attribute_tables[4]; | |
44 | |
45 /* Hashtable mapping names (represented as substrings) to attribute specs. */ | |
46 static htab_t attribute_hash; | |
47 | |
48 /* Substring representation. */ | |
49 | |
50 struct substring | |
51 { | |
52 const char *str; | |
53 int length; | |
54 }; | |
55 | |
56 static bool attributes_initialized = false; | |
57 | |
58 /* Default empty table of attributes. */ | |
59 | |
60 static const struct attribute_spec empty_attribute_table[] = | |
61 { | |
62 { NULL, 0, 0, false, false, false, NULL } | |
63 }; | |
64 | |
65 /* Return base name of the attribute. Ie '__attr__' is turned into 'attr'. | |
66 To avoid need for copying, we simply return length of the string. */ | |
67 | |
68 static void | |
69 extract_attribute_substring (struct substring *str) | |
70 { | |
71 if (str->length > 4 && str->str[0] == '_' && str->str[1] == '_' | |
72 && str->str[str->length - 1] == '_' && str->str[str->length - 2] == '_') | |
73 { | |
74 str->length -= 4; | |
75 str->str += 2; | |
76 } | |
77 } | |
78 | |
79 /* Simple hash function to avoid need to scan whole string. */ | |
80 | |
81 static inline hashval_t | |
82 substring_hash (const char *str, int l) | |
83 { | |
84 return str[0] + str[l - 1] * 256 + l * 65536; | |
85 } | |
86 | |
87 /* Used for attribute_hash. */ | |
88 | |
89 static hashval_t | |
90 hash_attr (const void *p) | |
91 { | |
92 const struct attribute_spec *const spec = (const struct attribute_spec *) p; | |
93 const int l = strlen (spec->name); | |
94 | |
95 return substring_hash (spec->name, l); | |
96 } | |
97 | |
98 /* Used for attribute_hash. */ | |
99 | |
100 static int | |
101 eq_attr (const void *p, const void *q) | |
102 { | |
103 const struct attribute_spec *const spec = (const struct attribute_spec *) p; | |
104 const struct substring *const str = (const struct substring *) q; | |
105 | |
106 return (!strncmp (spec->name, str->str, str->length) && !spec->name[str->length]); | |
107 } | |
108 | |
109 /* Initialize attribute tables, and make some sanity checks | |
110 if --enable-checking. */ | |
111 | |
112 static void | |
113 init_attributes (void) | |
114 { | |
115 size_t i; | |
116 int k; | |
117 | |
118 attribute_tables[0] = lang_hooks.common_attribute_table; | |
119 attribute_tables[1] = lang_hooks.attribute_table; | |
120 attribute_tables[2] = lang_hooks.format_attribute_table; | |
121 attribute_tables[3] = targetm.attribute_table; | |
122 | |
123 /* Translate NULL pointers to pointers to the empty table. */ | |
124 for (i = 0; i < ARRAY_SIZE (attribute_tables); i++) | |
125 if (attribute_tables[i] == NULL) | |
126 attribute_tables[i] = empty_attribute_table; | |
127 | |
128 #ifdef ENABLE_CHECKING | |
129 /* Make some sanity checks on the attribute tables. */ | |
130 for (i = 0; i < ARRAY_SIZE (attribute_tables); i++) | |
131 { | |
132 int j; | |
133 | |
134 for (j = 0; attribute_tables[i][j].name != NULL; j++) | |
135 { | |
136 /* The name must not begin and end with __. */ | |
137 const char *name = attribute_tables[i][j].name; | |
138 int len = strlen (name); | |
139 | |
140 gcc_assert (!(name[0] == '_' && name[1] == '_' | |
141 && name[len - 1] == '_' && name[len - 2] == '_')); | |
142 | |
143 /* The minimum and maximum lengths must be consistent. */ | |
144 gcc_assert (attribute_tables[i][j].min_length >= 0); | |
145 | |
146 gcc_assert (attribute_tables[i][j].max_length == -1 | |
147 || (attribute_tables[i][j].max_length | |
148 >= attribute_tables[i][j].min_length)); | |
149 | |
150 /* An attribute cannot require both a DECL and a TYPE. */ | |
151 gcc_assert (!attribute_tables[i][j].decl_required | |
152 || !attribute_tables[i][j].type_required); | |
153 | |
154 /* If an attribute requires a function type, in particular | |
155 it requires a type. */ | |
156 gcc_assert (!attribute_tables[i][j].function_type_required | |
157 || attribute_tables[i][j].type_required); | |
158 } | |
159 } | |
160 | |
161 /* Check that each name occurs just once in each table. */ | |
162 for (i = 0; i < ARRAY_SIZE (attribute_tables); i++) | |
163 { | |
164 int j, k; | |
165 for (j = 0; attribute_tables[i][j].name != NULL; j++) | |
166 for (k = j + 1; attribute_tables[i][k].name != NULL; k++) | |
167 gcc_assert (strcmp (attribute_tables[i][j].name, | |
168 attribute_tables[i][k].name)); | |
169 } | |
170 /* Check that no name occurs in more than one table. */ | |
171 for (i = 0; i < ARRAY_SIZE (attribute_tables); i++) | |
172 { | |
173 size_t j, k, l; | |
174 | |
175 for (j = i + 1; j < ARRAY_SIZE (attribute_tables); j++) | |
176 for (k = 0; attribute_tables[i][k].name != NULL; k++) | |
177 for (l = 0; attribute_tables[j][l].name != NULL; l++) | |
178 gcc_assert (strcmp (attribute_tables[i][k].name, | |
179 attribute_tables[j][l].name)); | |
180 } | |
181 #endif | |
182 | |
183 attribute_hash = htab_create (200, hash_attr, eq_attr, NULL); | |
184 for (i = 0; i < ARRAY_SIZE (attribute_tables); i++) | |
185 for (k = 0; attribute_tables[i][k].name != NULL; k++) | |
186 { | |
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187 register_attribute (&attribute_tables[i][k]); |
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188 } |
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189 invoke_plugin_callbacks (PLUGIN_ATTRIBUTES, NULL); |
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190 attributes_initialized = true; |
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191 } |
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192 |
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193 /* Insert a single ATTR into the attribute table. */ |
0 | 194 |
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195 void |
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196 register_attribute (const struct attribute_spec *attr) |
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197 { |
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198 struct substring str; |
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199 void **slot; |
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200 |
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201 str.str = attr->name; |
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202 str.length = strlen (str.str); |
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203 slot = htab_find_slot_with_hash (attribute_hash, &str, |
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204 substring_hash (str.str, str.length), |
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205 INSERT); |
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206 gcc_assert (!*slot); |
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207 *slot = (void *) CONST_CAST (struct attribute_spec *, attr); |
0 | 208 } |
209 | |
210 /* Return the spec for the attribute named NAME. */ | |
211 | |
212 const struct attribute_spec * | |
213 lookup_attribute_spec (tree name) | |
214 { | |
215 struct substring attr; | |
216 | |
217 attr.str = IDENTIFIER_POINTER (name); | |
218 attr.length = IDENTIFIER_LENGTH (name); | |
219 extract_attribute_substring (&attr); | |
220 return (const struct attribute_spec *) | |
221 htab_find_with_hash (attribute_hash, &attr, | |
222 substring_hash (attr.str, attr.length)); | |
223 } | |
224 | |
225 /* Process the attributes listed in ATTRIBUTES and install them in *NODE, | |
226 which is either a DECL (including a TYPE_DECL) or a TYPE. If a DECL, | |
227 it should be modified in place; if a TYPE, a copy should be created | |
228 unless ATTR_FLAG_TYPE_IN_PLACE is set in FLAGS. FLAGS gives further | |
229 information, in the form of a bitwise OR of flags in enum attribute_flags | |
230 from tree.h. Depending on these flags, some attributes may be | |
231 returned to be applied at a later stage (for example, to apply | |
232 a decl attribute to the declaration rather than to its type). */ | |
233 | |
234 tree | |
235 decl_attributes (tree *node, tree attributes, int flags) | |
236 { | |
237 tree a; | |
238 tree returned_attrs = NULL_TREE; | |
239 | |
240 if (TREE_TYPE (*node) == error_mark_node) | |
241 return NULL_TREE; | |
242 | |
243 if (!attributes_initialized) | |
244 init_attributes (); | |
245 | |
246 /* If this is a function and the user used #pragma GCC optimize, add the | |
247 options to the attribute((optimize(...))) list. */ | |
248 if (TREE_CODE (*node) == FUNCTION_DECL && current_optimize_pragma) | |
249 { | |
250 tree cur_attr = lookup_attribute ("optimize", attributes); | |
251 tree opts = copy_list (current_optimize_pragma); | |
252 | |
253 if (! cur_attr) | |
254 attributes | |
255 = tree_cons (get_identifier ("optimize"), opts, attributes); | |
256 else | |
257 TREE_VALUE (cur_attr) = chainon (opts, TREE_VALUE (cur_attr)); | |
258 } | |
259 | |
260 if (TREE_CODE (*node) == FUNCTION_DECL | |
261 && optimization_current_node != optimization_default_node | |
262 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (*node)) | |
263 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (*node) = optimization_current_node; | |
264 | |
265 /* If this is a function and the user used #pragma GCC target, add the | |
266 options to the attribute((target(...))) list. */ | |
267 if (TREE_CODE (*node) == FUNCTION_DECL | |
268 && current_target_pragma | |
269 && targetm.target_option.valid_attribute_p (*node, NULL_TREE, | |
270 current_target_pragma, 0)) | |
271 { | |
272 tree cur_attr = lookup_attribute ("target", attributes); | |
273 tree opts = copy_list (current_target_pragma); | |
274 | |
275 if (! cur_attr) | |
276 attributes = tree_cons (get_identifier ("target"), opts, attributes); | |
277 else | |
278 TREE_VALUE (cur_attr) = chainon (opts, TREE_VALUE (cur_attr)); | |
279 } | |
280 | |
281 targetm.insert_attributes (*node, &attributes); | |
282 | |
283 for (a = attributes; a; a = TREE_CHAIN (a)) | |
284 { | |
285 tree name = TREE_PURPOSE (a); | |
286 tree args = TREE_VALUE (a); | |
287 tree *anode = node; | |
288 const struct attribute_spec *spec = lookup_attribute_spec (name); | |
289 bool no_add_attrs = 0; | |
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290 int fn_ptr_quals = 0; |
0 | 291 tree fn_ptr_tmp = NULL_TREE; |
292 | |
293 if (spec == NULL) | |
294 { | |
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295 warning (OPT_Wattributes, "%qE attribute directive ignored", |
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296 name); |
0 | 297 continue; |
298 } | |
299 else if (list_length (args) < spec->min_length | |
300 || (spec->max_length >= 0 | |
301 && list_length (args) > spec->max_length)) | |
302 { | |
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303 error ("wrong number of arguments specified for %qE attribute", |
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304 name); |
0 | 305 continue; |
306 } | |
307 gcc_assert (is_attribute_p (spec->name, name)); | |
308 | |
309 if (spec->decl_required && !DECL_P (*anode)) | |
310 { | |
311 if (flags & ((int) ATTR_FLAG_DECL_NEXT | |
312 | (int) ATTR_FLAG_FUNCTION_NEXT | |
313 | (int) ATTR_FLAG_ARRAY_NEXT)) | |
314 { | |
315 /* Pass on this attribute to be tried again. */ | |
316 returned_attrs = tree_cons (name, args, returned_attrs); | |
317 continue; | |
318 } | |
319 else | |
320 { | |
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321 warning (OPT_Wattributes, "%qE attribute does not apply to types", |
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322 name); |
0 | 323 continue; |
324 } | |
325 } | |
326 | |
327 /* If we require a type, but were passed a decl, set up to make a | |
328 new type and update the one in the decl. ATTR_FLAG_TYPE_IN_PLACE | |
329 would have applied if we'd been passed a type, but we cannot modify | |
330 the decl's type in place here. */ | |
331 if (spec->type_required && DECL_P (*anode)) | |
332 { | |
333 anode = &TREE_TYPE (*anode); | |
334 /* Allow ATTR_FLAG_TYPE_IN_PLACE for the type's naming decl. */ | |
335 if (!(TREE_CODE (*anode) == TYPE_DECL | |
336 && *anode == TYPE_NAME (TYPE_MAIN_VARIANT | |
337 (TREE_TYPE (*anode))))) | |
338 flags &= ~(int) ATTR_FLAG_TYPE_IN_PLACE; | |
339 } | |
340 | |
341 if (spec->function_type_required && TREE_CODE (*anode) != FUNCTION_TYPE | |
342 && TREE_CODE (*anode) != METHOD_TYPE) | |
343 { | |
344 if (TREE_CODE (*anode) == POINTER_TYPE | |
345 && (TREE_CODE (TREE_TYPE (*anode)) == FUNCTION_TYPE | |
346 || TREE_CODE (TREE_TYPE (*anode)) == METHOD_TYPE)) | |
347 { | |
348 /* OK, this is a bit convoluted. We can't just make a copy | |
349 of the pointer type and modify its TREE_TYPE, because if | |
350 we change the attributes of the target type the pointer | |
351 type needs to have a different TYPE_MAIN_VARIANT. So we | |
352 pull out the target type now, frob it as appropriate, and | |
353 rebuild the pointer type later. | |
354 | |
355 This would all be simpler if attributes were part of the | |
356 declarator, grumble grumble. */ | |
357 fn_ptr_tmp = TREE_TYPE (*anode); | |
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358 fn_ptr_quals = TYPE_QUALS (*anode); |
0 | 359 anode = &fn_ptr_tmp; |
360 flags &= ~(int) ATTR_FLAG_TYPE_IN_PLACE; | |
361 } | |
362 else if (flags & (int) ATTR_FLAG_FUNCTION_NEXT) | |
363 { | |
364 /* Pass on this attribute to be tried again. */ | |
365 returned_attrs = tree_cons (name, args, returned_attrs); | |
366 continue; | |
367 } | |
368 | |
369 if (TREE_CODE (*anode) != FUNCTION_TYPE | |
370 && TREE_CODE (*anode) != METHOD_TYPE) | |
371 { | |
372 warning (OPT_Wattributes, | |
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373 "%qE attribute only applies to function types", |
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374 name); |
0 | 375 continue; |
376 } | |
377 } | |
378 | |
379 if (TYPE_P (*anode) | |
380 && (flags & (int) ATTR_FLAG_TYPE_IN_PLACE) | |
381 && TYPE_SIZE (*anode) != NULL_TREE) | |
382 { | |
383 warning (OPT_Wattributes, "type attributes ignored after type is already defined"); | |
384 continue; | |
385 } | |
386 | |
387 if (spec->handler != NULL) | |
388 returned_attrs = chainon ((*spec->handler) (anode, name, args, | |
389 flags, &no_add_attrs), | |
390 returned_attrs); | |
391 | |
392 /* Layout the decl in case anything changed. */ | |
393 if (spec->type_required && DECL_P (*node) | |
394 && (TREE_CODE (*node) == VAR_DECL | |
395 || TREE_CODE (*node) == PARM_DECL | |
396 || TREE_CODE (*node) == RESULT_DECL)) | |
397 relayout_decl (*node); | |
398 | |
399 if (!no_add_attrs) | |
400 { | |
401 tree old_attrs; | |
402 tree a; | |
403 | |
404 if (DECL_P (*anode)) | |
405 old_attrs = DECL_ATTRIBUTES (*anode); | |
406 else | |
407 old_attrs = TYPE_ATTRIBUTES (*anode); | |
408 | |
409 for (a = lookup_attribute (spec->name, old_attrs); | |
410 a != NULL_TREE; | |
411 a = lookup_attribute (spec->name, TREE_CHAIN (a))) | |
412 { | |
413 if (simple_cst_equal (TREE_VALUE (a), args) == 1) | |
414 break; | |
415 } | |
416 | |
417 if (a == NULL_TREE) | |
418 { | |
419 /* This attribute isn't already in the list. */ | |
420 if (DECL_P (*anode)) | |
421 DECL_ATTRIBUTES (*anode) = tree_cons (name, args, old_attrs); | |
422 else if (flags & (int) ATTR_FLAG_TYPE_IN_PLACE) | |
423 { | |
424 TYPE_ATTRIBUTES (*anode) = tree_cons (name, args, old_attrs); | |
425 /* If this is the main variant, also push the attributes | |
426 out to the other variants. */ | |
427 if (*anode == TYPE_MAIN_VARIANT (*anode)) | |
428 { | |
429 tree variant; | |
430 for (variant = *anode; variant; | |
431 variant = TYPE_NEXT_VARIANT (variant)) | |
432 { | |
433 if (TYPE_ATTRIBUTES (variant) == old_attrs) | |
434 TYPE_ATTRIBUTES (variant) | |
435 = TYPE_ATTRIBUTES (*anode); | |
436 else if (!lookup_attribute | |
437 (spec->name, TYPE_ATTRIBUTES (variant))) | |
438 TYPE_ATTRIBUTES (variant) = tree_cons | |
439 (name, args, TYPE_ATTRIBUTES (variant)); | |
440 } | |
441 } | |
442 } | |
443 else | |
444 *anode = build_type_attribute_variant (*anode, | |
445 tree_cons (name, args, | |
446 old_attrs)); | |
447 } | |
448 } | |
449 | |
450 if (fn_ptr_tmp) | |
451 { | |
452 /* Rebuild the function pointer type and put it in the | |
453 appropriate place. */ | |
454 fn_ptr_tmp = build_pointer_type (fn_ptr_tmp); | |
63
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
455 if (fn_ptr_quals) |
b7f97abdc517
update gcc from gcc-4.5.0 to gcc-4.6
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
55
diff
changeset
|
456 fn_ptr_tmp = build_qualified_type (fn_ptr_tmp, fn_ptr_quals); |
0 | 457 if (DECL_P (*node)) |
458 TREE_TYPE (*node) = fn_ptr_tmp; | |
459 else | |
460 { | |
461 gcc_assert (TREE_CODE (*node) == POINTER_TYPE); | |
462 *node = fn_ptr_tmp; | |
463 } | |
464 } | |
465 } | |
466 | |
467 return returned_attrs; | |
468 } |