1 /* C-family attributes handling.
2 Copyright (C) 1992-2018 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
22 #include "coretypes.h"
28 #include "gimple-expr.h"
30 #include "stringpool.h"
32 #include "diagnostic.h"
34 #include "stor-layout.h"
38 #include "trans-mem.h"
40 #include "common/common-target.h"
41 #include "langhooks.h"
42 #include "tree-inline.h"
44 #include "tree-iterator.h"
48 static tree
handle_packed_attribute (tree
*, tree
, tree
, int, bool *);
49 static tree
handle_nocommon_attribute (tree
*, tree
, tree
, int, bool *);
50 static tree
handle_common_attribute (tree
*, tree
, tree
, int, bool *);
51 static tree
handle_noreturn_attribute (tree
*, tree
, tree
, int, bool *);
52 static tree
handle_hot_attribute (tree
*, tree
, tree
, int, bool *);
53 static tree
handle_cold_attribute (tree
*, tree
, tree
, int, bool *);
54 static tree
handle_no_sanitize_attribute (tree
*, tree
, tree
, int, bool *);
55 static tree
handle_no_sanitize_address_attribute (tree
*, tree
, tree
,
57 static tree
handle_no_sanitize_thread_attribute (tree
*, tree
, tree
,
59 static tree
handle_no_address_safety_analysis_attribute (tree
*, tree
, tree
,
61 static tree
handle_no_sanitize_undefined_attribute (tree
*, tree
, tree
, int,
63 static tree
handle_asan_odr_indicator_attribute (tree
*, tree
, tree
, int,
65 static tree
handle_stack_protect_attribute (tree
*, tree
, tree
, int, bool *);
66 static tree
handle_noinline_attribute (tree
*, tree
, tree
, int, bool *);
67 static tree
handle_noclone_attribute (tree
*, tree
, tree
, int, bool *);
68 static tree
handle_nocf_check_attribute (tree
*, tree
, tree
, int, bool *);
69 static tree
handle_noicf_attribute (tree
*, tree
, tree
, int, bool *);
70 static tree
handle_noipa_attribute (tree
*, tree
, tree
, int, bool *);
71 static tree
handle_leaf_attribute (tree
*, tree
, tree
, int, bool *);
72 static tree
handle_always_inline_attribute (tree
*, tree
, tree
, int,
74 static tree
handle_gnu_inline_attribute (tree
*, tree
, tree
, int, bool *);
75 static tree
handle_artificial_attribute (tree
*, tree
, tree
, int, bool *);
76 static tree
handle_flatten_attribute (tree
*, tree
, tree
, int, bool *);
77 static tree
handle_error_attribute (tree
*, tree
, tree
, int, bool *);
78 static tree
handle_used_attribute (tree
*, tree
, tree
, int, bool *);
79 static tree
handle_externally_visible_attribute (tree
*, tree
, tree
, int,
81 static tree
handle_no_reorder_attribute (tree
*, tree
, tree
, int,
83 static tree
handle_const_attribute (tree
*, tree
, tree
, int, bool *);
84 static tree
handle_transparent_union_attribute (tree
*, tree
, tree
,
86 static tree
handle_scalar_storage_order_attribute (tree
*, tree
, tree
,
88 static tree
handle_constructor_attribute (tree
*, tree
, tree
, int, bool *);
89 static tree
handle_destructor_attribute (tree
*, tree
, tree
, int, bool *);
90 static tree
handle_mode_attribute (tree
*, tree
, tree
, int, bool *);
91 static tree
handle_section_attribute (tree
*, tree
, tree
, int, bool *);
92 static tree
handle_aligned_attribute (tree
*, tree
, tree
, int, bool *);
93 static tree
handle_warn_if_not_aligned_attribute (tree
*, tree
, tree
,
95 static tree
handle_weak_attribute (tree
*, tree
, tree
, int, bool *) ;
96 static tree
handle_noplt_attribute (tree
*, tree
, tree
, int, bool *) ;
97 static tree
handle_alias_ifunc_attribute (bool, tree
*, tree
, tree
, bool *);
98 static tree
handle_ifunc_attribute (tree
*, tree
, tree
, int, bool *);
99 static tree
handle_alias_attribute (tree
*, tree
, tree
, int, bool *);
100 static tree
handle_weakref_attribute (tree
*, tree
, tree
, int, bool *) ;
101 static tree
handle_visibility_attribute (tree
*, tree
, tree
, int,
103 static tree
handle_tls_model_attribute (tree
*, tree
, tree
, int,
105 static tree
handle_no_instrument_function_attribute (tree
*, tree
,
107 static tree
handle_no_profile_instrument_function_attribute (tree
*, tree
,
109 static tree
handle_malloc_attribute (tree
*, tree
, tree
, int, bool *);
110 static tree
handle_returns_twice_attribute (tree
*, tree
, tree
, int, bool *);
111 static tree
handle_no_limit_stack_attribute (tree
*, tree
, tree
, int,
113 static tree
handle_pure_attribute (tree
*, tree
, tree
, int, bool *);
114 static tree
handle_tm_attribute (tree
*, tree
, tree
, int, bool *);
115 static tree
handle_tm_wrap_attribute (tree
*, tree
, tree
, int, bool *);
116 static tree
handle_novops_attribute (tree
*, tree
, tree
, int, bool *);
117 static tree
handle_deprecated_attribute (tree
*, tree
, tree
, int,
119 static tree
handle_vector_size_attribute (tree
*, tree
, tree
, int,
121 static tree
handle_nonnull_attribute (tree
*, tree
, tree
, int, bool *);
122 static tree
handle_nonstring_attribute (tree
*, tree
, tree
, int, bool *);
123 static tree
handle_nothrow_attribute (tree
*, tree
, tree
, int, bool *);
124 static tree
handle_cleanup_attribute (tree
*, tree
, tree
, int, bool *);
125 static tree
handle_warn_unused_result_attribute (tree
*, tree
, tree
, int,
127 static tree
handle_sentinel_attribute (tree
*, tree
, tree
, int, bool *);
128 static tree
handle_type_generic_attribute (tree
*, tree
, tree
, int, bool *);
129 static tree
handle_alloc_size_attribute (tree
*, tree
, tree
, int, bool *);
130 static tree
handle_alloc_align_attribute (tree
*, tree
, tree
, int, bool *);
131 static tree
handle_assume_aligned_attribute (tree
*, tree
, tree
, int, bool *);
132 static tree
handle_target_attribute (tree
*, tree
, tree
, int, bool *);
133 static tree
handle_target_clones_attribute (tree
*, tree
, tree
, int, bool *);
134 static tree
handle_optimize_attribute (tree
*, tree
, tree
, int, bool *);
135 static tree
ignore_attribute (tree
*, tree
, tree
, int, bool *);
136 static tree
handle_no_split_stack_attribute (tree
*, tree
, tree
, int, bool *);
137 static tree
handle_fnspec_attribute (tree
*, tree
, tree
, int, bool *);
138 static tree
handle_warn_unused_attribute (tree
*, tree
, tree
, int, bool *);
139 static tree
handle_returns_nonnull_attribute (tree
*, tree
, tree
, int, bool *);
140 static tree
handle_omp_declare_simd_attribute (tree
*, tree
, tree
, int,
142 static tree
handle_simd_attribute (tree
*, tree
, tree
, int, bool *);
143 static tree
handle_omp_declare_target_attribute (tree
*, tree
, tree
, int,
145 static tree
handle_designated_init_attribute (tree
*, tree
, tree
, int, bool *);
146 static tree
handle_bnd_variable_size_attribute (tree
*, tree
, tree
, int, bool *);
147 static tree
handle_bnd_legacy (tree
*, tree
, tree
, int, bool *);
148 static tree
handle_bnd_instrument (tree
*, tree
, tree
, int, bool *);
149 static tree
handle_fallthrough_attribute (tree
*, tree
, tree
, int, bool *);
150 static tree
handle_patchable_function_entry_attribute (tree
*, tree
, tree
,
153 /* Helper to define attribute exclusions. */
154 #define ATTR_EXCL(name, function, type, variable) \
155 { name, function, type, variable }
157 /* Define attributes that are mutually exclusive with one another. */
158 static const struct attribute_spec::exclusions attr_aligned_exclusions
[] =
160 /* Attribute name exclusion applies to:
161 function, type, variable */
162 ATTR_EXCL ("aligned", true, false, false),
163 ATTR_EXCL ("packed", true, false, false),
164 ATTR_EXCL (NULL
, false, false, false)
167 static const struct attribute_spec::exclusions attr_cold_hot_exclusions
[] =
169 ATTR_EXCL ("cold", true, true, true),
170 ATTR_EXCL ("hot", true, true, true),
171 ATTR_EXCL (NULL
, false, false, false)
174 static const struct attribute_spec::exclusions attr_common_exclusions
[] =
176 ATTR_EXCL ("common", true, true, true),
177 ATTR_EXCL ("nocommon", true, true, true),
178 ATTR_EXCL (NULL
, false, false, false),
181 static const struct attribute_spec::exclusions attr_inline_exclusions
[] =
183 ATTR_EXCL ("noinline", true, true, true),
184 ATTR_EXCL (NULL
, false, false, false),
187 static const struct attribute_spec::exclusions attr_noinline_exclusions
[] =
189 ATTR_EXCL ("always_inline", true, true, true),
190 ATTR_EXCL ("gnu_inline", true, true, true),
191 ATTR_EXCL (NULL
, false, false, false),
194 static const struct attribute_spec::exclusions attr_noreturn_exclusions
[] =
196 ATTR_EXCL ("alloc_align", true, true, true),
197 ATTR_EXCL ("alloc_size", true, true, true),
198 ATTR_EXCL ("const", true, true, true),
199 ATTR_EXCL ("malloc", true, true, true),
200 ATTR_EXCL ("pure", true, true, true),
201 ATTR_EXCL ("returns_twice", true, true, true),
202 ATTR_EXCL ("warn_unused_result", true, true, true),
203 ATTR_EXCL (NULL
, false, false, false),
206 static const struct attribute_spec::exclusions
207 attr_warn_unused_result_exclusions
[] =
209 ATTR_EXCL ("noreturn", true, true, true),
210 ATTR_EXCL ("warn_unused_result", true, true, true),
211 ATTR_EXCL (NULL
, false, false, false),
214 static const struct attribute_spec::exclusions attr_returns_twice_exclusions
[] =
216 ATTR_EXCL ("noreturn", true, true, true),
217 ATTR_EXCL (NULL
, false, false, false),
220 /* Exclusions that apply to attribute alloc_align, alloc_size, and malloc. */
221 static const struct attribute_spec::exclusions attr_alloc_exclusions
[] =
223 ATTR_EXCL ("const", true, true, true),
224 ATTR_EXCL ("noreturn", true, true, true),
225 ATTR_EXCL ("pure", true, true, true),
226 ATTR_EXCL (NULL
, false, false, false),
229 static const struct attribute_spec::exclusions attr_const_pure_exclusions
[] =
231 ATTR_EXCL ("const", true, true, true),
232 ATTR_EXCL ("alloc_align", true, true, true),
233 ATTR_EXCL ("alloc_size", true, true, true),
234 ATTR_EXCL ("malloc", true, true, true),
235 ATTR_EXCL ("noreturn", true, true, true),
236 ATTR_EXCL ("pure", true, true, true),
237 ATTR_EXCL (NULL
, false, false, false)
240 /* Table of machine-independent attributes common to all C-like languages.
242 All attributes referencing arguments should be additionally processed
243 in chkp_copy_function_type_adding_bounds for correct instrumentation
244 by Pointer Bounds Checker.
245 Current list of processed common attributes: nonnull. */
246 const struct attribute_spec c_common_attribute_table
[] =
248 /* { name, min_len, max_len, decl_req, type_req, fn_type_req,
249 affects_type_identity, handler, exclude } */
250 { "packed", 0, 0, false, false, false, false,
251 handle_packed_attribute
,
252 attr_aligned_exclusions
},
253 { "nocommon", 0, 0, true, false, false, false,
254 handle_nocommon_attribute
,
255 attr_common_exclusions
},
256 { "common", 0, 0, true, false, false, false,
257 handle_common_attribute
,
258 attr_common_exclusions
},
259 /* FIXME: logically, noreturn attributes should be listed as
260 "false, true, true" and apply to function types. But implementing this
261 would require all the places in the compiler that use TREE_THIS_VOLATILE
262 on a decl to identify non-returning functions to be located and fixed
263 to check the function type instead. */
264 { "noreturn", 0, 0, true, false, false, false,
265 handle_noreturn_attribute
,
266 attr_noreturn_exclusions
},
267 { "volatile", 0, 0, true, false, false, false,
268 handle_noreturn_attribute
, NULL
},
269 { "stack_protect", 0, 0, true, false, false, false,
270 handle_stack_protect_attribute
, NULL
},
271 { "noinline", 0, 0, true, false, false, false,
272 handle_noinline_attribute
,
273 attr_noinline_exclusions
},
274 { "noclone", 0, 0, true, false, false, false,
275 handle_noclone_attribute
, NULL
},
276 { "no_icf", 0, 0, true, false, false, false,
277 handle_noicf_attribute
, NULL
},
278 { "noipa", 0, 0, true, false, false, false,
279 handle_noipa_attribute
, NULL
},
280 { "leaf", 0, 0, true, false, false, false,
281 handle_leaf_attribute
, NULL
},
282 { "always_inline", 0, 0, true, false, false, false,
283 handle_always_inline_attribute
,
284 attr_inline_exclusions
},
285 { "gnu_inline", 0, 0, true, false, false, false,
286 handle_gnu_inline_attribute
,
287 attr_inline_exclusions
},
288 { "artificial", 0, 0, true, false, false, false,
289 handle_artificial_attribute
, NULL
},
290 { "flatten", 0, 0, true, false, false, false,
291 handle_flatten_attribute
, NULL
},
292 { "used", 0, 0, true, false, false, false,
293 handle_used_attribute
, NULL
},
294 { "unused", 0, 0, false, false, false, false,
295 handle_unused_attribute
, NULL
},
296 { "externally_visible", 0, 0, true, false, false, false,
297 handle_externally_visible_attribute
, NULL
},
298 { "no_reorder", 0, 0, true, false, false, false,
299 handle_no_reorder_attribute
, NULL
},
300 /* The same comments as for noreturn attributes apply to const ones. */
301 { "const", 0, 0, true, false, false, false,
302 handle_const_attribute
,
303 attr_const_pure_exclusions
},
304 { "scalar_storage_order", 1, 1, false, false, false, false,
305 handle_scalar_storage_order_attribute
, NULL
},
306 { "transparent_union", 0, 0, false, false, false, false,
307 handle_transparent_union_attribute
, NULL
},
308 { "constructor", 0, 1, true, false, false, false,
309 handle_constructor_attribute
, NULL
},
310 { "destructor", 0, 1, true, false, false, false,
311 handle_destructor_attribute
, NULL
},
312 { "mode", 1, 1, false, true, false, false,
313 handle_mode_attribute
, NULL
},
314 { "section", 1, 1, true, false, false, false,
315 handle_section_attribute
, NULL
},
316 { "aligned", 0, 1, false, false, false, false,
317 handle_aligned_attribute
,
318 attr_aligned_exclusions
},
319 { "warn_if_not_aligned", 0, 1, false, false, false, false,
320 handle_warn_if_not_aligned_attribute
, NULL
},
321 { "weak", 0, 0, true, false, false, false,
322 handle_weak_attribute
, NULL
},
323 { "noplt", 0, 0, true, false, false, false,
324 handle_noplt_attribute
, NULL
},
325 { "ifunc", 1, 1, true, false, false, false,
326 handle_ifunc_attribute
, NULL
},
327 { "alias", 1, 1, true, false, false, false,
328 handle_alias_attribute
, NULL
},
329 { "weakref", 0, 1, true, false, false, false,
330 handle_weakref_attribute
, NULL
},
331 { "no_instrument_function", 0, 0, true, false, false, false,
332 handle_no_instrument_function_attribute
,
334 { "no_profile_instrument_function", 0, 0, true, false, false, false,
335 handle_no_profile_instrument_function_attribute
,
337 { "malloc", 0, 0, true, false, false, false,
338 handle_malloc_attribute
, attr_alloc_exclusions
},
339 { "returns_twice", 0, 0, true, false, false, false,
340 handle_returns_twice_attribute
,
341 attr_returns_twice_exclusions
},
342 { "no_stack_limit", 0, 0, true, false, false, false,
343 handle_no_limit_stack_attribute
, NULL
},
344 { "pure", 0, 0, true, false, false, false,
345 handle_pure_attribute
,
346 attr_const_pure_exclusions
},
347 { "transaction_callable", 0, 0, false, true, false, false,
348 handle_tm_attribute
, NULL
},
349 { "transaction_unsafe", 0, 0, false, true, false, true,
350 handle_tm_attribute
, NULL
},
351 { "transaction_safe", 0, 0, false, true, false, true,
352 handle_tm_attribute
, NULL
},
353 { "transaction_safe_dynamic", 0, 0, true, false, false, false,
354 handle_tm_attribute
, NULL
},
355 { "transaction_may_cancel_outer", 0, 0, false, true, false, false,
356 handle_tm_attribute
, NULL
},
357 /* ??? These two attributes didn't make the transition from the
358 Intel language document to the multi-vendor language document. */
359 { "transaction_pure", 0, 0, false, true, false, false,
360 handle_tm_attribute
, NULL
},
361 { "transaction_wrap", 1, 1, true, false, false, false,
362 handle_tm_wrap_attribute
, NULL
},
363 /* For internal use (marking of builtins) only. The name contains space
364 to prevent its usage in source code. */
365 { "no vops", 0, 0, true, false, false, false,
366 handle_novops_attribute
, NULL
},
367 { "deprecated", 0, 1, false, false, false, false,
368 handle_deprecated_attribute
, NULL
},
369 { "vector_size", 1, 1, false, true, false, true,
370 handle_vector_size_attribute
, NULL
},
371 { "visibility", 1, 1, false, false, false, false,
372 handle_visibility_attribute
, NULL
},
373 { "tls_model", 1, 1, true, false, false, false,
374 handle_tls_model_attribute
, NULL
},
375 { "nonnull", 0, -1, false, true, true, false,
376 handle_nonnull_attribute
, NULL
},
377 { "nonstring", 0, 0, true, false, false, false,
378 handle_nonstring_attribute
, NULL
},
379 { "nothrow", 0, 0, true, false, false, false,
380 handle_nothrow_attribute
, NULL
},
381 { "may_alias", 0, 0, false, true, false, false, NULL
, NULL
},
382 { "cleanup", 1, 1, true, false, false, false,
383 handle_cleanup_attribute
, NULL
},
384 { "warn_unused_result", 0, 0, false, true, true, false,
385 handle_warn_unused_result_attribute
,
386 attr_warn_unused_result_exclusions
},
387 { "sentinel", 0, 1, false, true, true, false,
388 handle_sentinel_attribute
, NULL
},
389 /* For internal use (marking of builtins) only. The name contains space
390 to prevent its usage in source code. */
391 { "type generic", 0, 0, false, true, true, false,
392 handle_type_generic_attribute
, NULL
},
393 { "alloc_size", 1, 2, false, true, true, false,
394 handle_alloc_size_attribute
,
395 attr_alloc_exclusions
},
396 { "cold", 0, 0, true, false, false, false,
397 handle_cold_attribute
,
398 attr_cold_hot_exclusions
},
399 { "hot", 0, 0, true, false, false, false,
400 handle_hot_attribute
,
401 attr_cold_hot_exclusions
},
402 { "no_address_safety_analysis",
403 0, 0, true, false, false, false,
404 handle_no_address_safety_analysis_attribute
,
406 { "no_sanitize", 1, 1, true, false, false, false,
407 handle_no_sanitize_attribute
, NULL
},
408 { "no_sanitize_address", 0, 0, true, false, false, false,
409 handle_no_sanitize_address_attribute
, NULL
},
410 { "no_sanitize_thread", 0, 0, true, false, false, false,
411 handle_no_sanitize_thread_attribute
, NULL
},
412 { "no_sanitize_undefined", 0, 0, true, false, false, false,
413 handle_no_sanitize_undefined_attribute
, NULL
},
414 { "asan odr indicator", 0, 0, true, false, false, false,
415 handle_asan_odr_indicator_attribute
, NULL
},
416 { "warning", 1, 1, true, false, false, false,
417 handle_error_attribute
, NULL
},
418 { "error", 1, 1, true, false, false, false,
419 handle_error_attribute
, NULL
},
420 { "target", 1, -1, true, false, false, false,
421 handle_target_attribute
, NULL
},
422 { "target_clones", 1, -1, true, false, false, false,
423 handle_target_clones_attribute
, NULL
},
424 { "optimize", 1, -1, true, false, false, false,
425 handle_optimize_attribute
, NULL
},
426 /* For internal use only. The leading '*' both prevents its usage in
427 source code and signals that it may be overridden by machine tables. */
428 { "*tm regparm", 0, 0, false, true, true, false,
429 ignore_attribute
, NULL
},
430 { "no_split_stack", 0, 0, true, false, false, false,
431 handle_no_split_stack_attribute
, NULL
},
432 /* For internal use (marking of builtins and runtime functions) only.
433 The name contains space to prevent its usage in source code. */
434 { "fn spec", 1, 1, false, true, true, false,
435 handle_fnspec_attribute
, NULL
},
436 { "warn_unused", 0, 0, false, false, false, false,
437 handle_warn_unused_attribute
, NULL
},
438 { "returns_nonnull", 0, 0, false, true, true, false,
439 handle_returns_nonnull_attribute
, NULL
},
440 { "omp declare simd", 0, -1, true, false, false, false,
441 handle_omp_declare_simd_attribute
, NULL
},
442 { "simd", 0, 1, true, false, false, false,
443 handle_simd_attribute
, NULL
},
444 { "omp declare target", 0, 0, true, false, false, false,
445 handle_omp_declare_target_attribute
, NULL
},
446 { "omp declare target link", 0, 0, true, false, false, false,
447 handle_omp_declare_target_attribute
, NULL
},
448 { "alloc_align", 1, 1, false, true, true, false,
449 handle_alloc_align_attribute
,
450 attr_alloc_exclusions
},
451 { "assume_aligned", 1, 2, false, true, true, false,
452 handle_assume_aligned_attribute
, NULL
},
453 { "designated_init", 0, 0, false, true, false, false,
454 handle_designated_init_attribute
, NULL
},
455 { "bnd_variable_size", 0, 0, true, false, false, false,
456 handle_bnd_variable_size_attribute
, NULL
},
457 { "bnd_legacy", 0, 0, true, false, false, false,
458 handle_bnd_legacy
, NULL
},
459 { "bnd_instrument", 0, 0, true, false, false, false,
460 handle_bnd_instrument
, NULL
},
461 { "fallthrough", 0, 0, false, false, false, false,
462 handle_fallthrough_attribute
, NULL
},
463 { "patchable_function_entry", 1, 2, true, false, false, false,
464 handle_patchable_function_entry_attribute
,
466 { "nocf_check", 0, 0, false, true, true, true,
467 handle_nocf_check_attribute
, NULL
},
468 { NULL
, 0, 0, false, false, false, false, NULL
, NULL
}
471 /* Give the specifications for the format attributes, used by C and all
474 All attributes referencing arguments should be additionally processed
475 in chkp_copy_function_type_adding_bounds for correct instrumentation
476 by Pointer Bounds Checker.
477 Current list of processed format attributes: format, format_arg. */
478 const struct attribute_spec c_common_format_attribute_table
[] =
480 /* { name, min_len, max_len, decl_req, type_req, fn_type_req,
481 affects_type_identity, handler, exclude } */
482 { "format", 3, 3, false, true, true, false,
483 handle_format_attribute
, NULL
},
484 { "format_arg", 1, 1, false, true, true, false,
485 handle_format_arg_attribute
, NULL
},
486 { NULL
, 0, 0, false, false, false, false, NULL
, NULL
}
489 /* Returns TRUE iff the attribute indicated by ATTR_ID takes a plain
490 identifier as an argument, so the front end shouldn't look it up. */
493 attribute_takes_identifier_p (const_tree attr_id
)
495 const struct attribute_spec
*spec
= lookup_attribute_spec (attr_id
);
497 /* Unknown attribute that we'll end up ignoring, return true so we
498 don't complain about an identifier argument. */
500 else if (!strcmp ("mode", spec
->name
)
501 || !strcmp ("format", spec
->name
)
502 || !strcmp ("cleanup", spec
->name
))
505 return targetm
.attribute_takes_identifier_p (attr_id
);
508 /* Attribute handlers common to C front ends. */
510 /* Handle a "packed" attribute; arguments as in
511 struct attribute_spec.handler. */
514 handle_packed_attribute (tree
*node
, tree name
, tree
ARG_UNUSED (args
),
515 int flags
, bool *no_add_attrs
)
519 if (!(flags
& (int) ATTR_FLAG_TYPE_IN_PLACE
))
520 *node
= build_variant_type_copy (*node
);
521 TYPE_PACKED (*node
) = 1;
523 else if (TREE_CODE (*node
) == FIELD_DECL
)
525 if (TYPE_ALIGN (TREE_TYPE (*node
)) <= BITS_PER_UNIT
526 /* Still pack bitfields. */
527 && ! DECL_C_BIT_FIELD (*node
))
528 warning (OPT_Wattributes
,
529 "%qE attribute ignored for field of type %qT",
530 name
, TREE_TYPE (*node
));
532 DECL_PACKED (*node
) = 1;
534 /* We can't set DECL_PACKED for a VAR_DECL, because the bit is
535 used for DECL_REGISTER. It wouldn't mean anything anyway.
536 We can't set DECL_PACKED on the type of a TYPE_DECL, because
537 that changes what the typedef is typing. */
540 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
541 *no_add_attrs
= true;
547 /* Handle a "nocommon" attribute; arguments as in
548 struct attribute_spec.handler. */
551 handle_nocommon_attribute (tree
*node
, tree name
,
552 tree
ARG_UNUSED (args
),
553 int ARG_UNUSED (flags
), bool *no_add_attrs
)
556 DECL_COMMON (*node
) = 0;
559 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
560 *no_add_attrs
= true;
566 /* Handle a "common" attribute; arguments as in
567 struct attribute_spec.handler. */
570 handle_common_attribute (tree
*node
, tree name
, tree
ARG_UNUSED (args
),
571 int ARG_UNUSED (flags
), bool *no_add_attrs
)
574 DECL_COMMON (*node
) = 1;
577 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
578 *no_add_attrs
= true;
584 /* Handle a "noreturn" attribute; arguments as in
585 struct attribute_spec.handler. */
588 handle_noreturn_attribute (tree
*node
, tree name
, tree
ARG_UNUSED (args
),
589 int ARG_UNUSED (flags
), bool *no_add_attrs
)
591 tree type
= TREE_TYPE (*node
);
593 /* See FIXME comment in c_common_attribute_table. */
594 if (TREE_CODE (*node
) == FUNCTION_DECL
595 || objc_method_decl (TREE_CODE (*node
)))
596 TREE_THIS_VOLATILE (*node
) = 1;
597 else if (TREE_CODE (type
) == POINTER_TYPE
598 && TREE_CODE (TREE_TYPE (type
)) == FUNCTION_TYPE
)
600 = (build_qualified_type
602 (build_type_variant (TREE_TYPE (type
),
603 TYPE_READONLY (TREE_TYPE (type
)), 1)),
607 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
608 *no_add_attrs
= true;
614 /* Handle a "hot" and attribute; arguments as in
615 struct attribute_spec.handler. */
618 handle_hot_attribute (tree
*node
, tree name
, tree
ARG_UNUSED (args
),
619 int ARG_UNUSED (flags
), bool *no_add_attrs
)
621 if (TREE_CODE (*node
) == FUNCTION_DECL
622 || TREE_CODE (*node
) == LABEL_DECL
)
624 /* Attribute hot processing is done later with lookup_attribute. */
628 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
629 *no_add_attrs
= true;
635 /* Handle a "cold" and attribute; arguments as in
636 struct attribute_spec.handler. */
639 handle_cold_attribute (tree
*node
, tree name
, tree
ARG_UNUSED (args
),
640 int ARG_UNUSED (flags
), bool *no_add_attrs
)
642 if (TREE_CODE (*node
) == FUNCTION_DECL
643 || TREE_CODE (*node
) == LABEL_DECL
)
645 /* Attribute cold processing is done later with lookup_attribute. */
649 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
650 *no_add_attrs
= true;
656 /* Add FLAGS for a function NODE to no_sanitize_flags in DECL_ATTRIBUTES. */
659 add_no_sanitize_value (tree node
, unsigned int flags
)
661 tree attr
= lookup_attribute ("no_sanitize", DECL_ATTRIBUTES (node
));
664 unsigned int old_value
= tree_to_uhwi (TREE_VALUE (attr
));
667 if (flags
== old_value
)
670 TREE_VALUE (attr
) = build_int_cst (unsigned_type_node
, flags
);
673 DECL_ATTRIBUTES (node
)
674 = tree_cons (get_identifier ("no_sanitize"),
675 build_int_cst (unsigned_type_node
, flags
),
676 DECL_ATTRIBUTES (node
));
679 /* Handle a "no_sanitize" attribute; arguments as in
680 struct attribute_spec.handler. */
683 handle_no_sanitize_attribute (tree
*node
, tree name
, tree args
, int,
686 *no_add_attrs
= true;
687 tree id
= TREE_VALUE (args
);
688 if (TREE_CODE (*node
) != FUNCTION_DECL
)
690 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
694 if (TREE_CODE (id
) != STRING_CST
)
696 error ("no_sanitize argument not a string");
700 char *string
= ASTRDUP (TREE_STRING_POINTER (id
));
701 unsigned int flags
= parse_no_sanitize_attribute (string
);
703 add_no_sanitize_value (*node
, flags
);
708 /* Handle a "no_sanitize_address" attribute; arguments as in
709 struct attribute_spec.handler. */
712 handle_no_sanitize_address_attribute (tree
*node
, tree name
, tree
, int,
715 *no_add_attrs
= true;
716 if (TREE_CODE (*node
) != FUNCTION_DECL
)
717 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
719 add_no_sanitize_value (*node
, SANITIZE_ADDRESS
);
724 /* Handle a "no_sanitize_thread" attribute; arguments as in
725 struct attribute_spec.handler. */
728 handle_no_sanitize_thread_attribute (tree
*node
, tree name
, tree
, int,
731 *no_add_attrs
= true;
732 if (TREE_CODE (*node
) != FUNCTION_DECL
)
733 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
735 add_no_sanitize_value (*node
, SANITIZE_THREAD
);
741 /* Handle a "no_address_safety_analysis" attribute; arguments as in
742 struct attribute_spec.handler. */
745 handle_no_address_safety_analysis_attribute (tree
*node
, tree name
, tree
, int,
748 *no_add_attrs
= true;
749 if (TREE_CODE (*node
) != FUNCTION_DECL
)
750 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
752 add_no_sanitize_value (*node
, SANITIZE_ADDRESS
);
757 /* Handle a "no_sanitize_undefined" attribute; arguments as in
758 struct attribute_spec.handler. */
761 handle_no_sanitize_undefined_attribute (tree
*node
, tree name
, tree
, int,
764 *no_add_attrs
= true;
765 if (TREE_CODE (*node
) != FUNCTION_DECL
)
766 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
768 add_no_sanitize_value (*node
,
769 SANITIZE_UNDEFINED
| SANITIZE_UNDEFINED_NONDEFAULT
);
774 /* Handle an "asan odr indicator" attribute; arguments as in
775 struct attribute_spec.handler. */
778 handle_asan_odr_indicator_attribute (tree
*, tree
, tree
, int, bool *)
783 /* Handle a "stack_protect" attribute; arguments as in
784 struct attribute_spec.handler. */
787 handle_stack_protect_attribute (tree
*node
, tree name
, tree
, int,
790 if (TREE_CODE (*node
) != FUNCTION_DECL
)
792 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
793 *no_add_attrs
= true;
799 /* Handle a "noipa" attribute; arguments as in
800 struct attribute_spec.handler. */
803 handle_noipa_attribute (tree
*node
, tree name
, tree
, int, bool *no_add_attrs
)
805 if (TREE_CODE (*node
) != FUNCTION_DECL
)
807 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
808 *no_add_attrs
= true;
814 /* Handle a "noinline" attribute; arguments as in
815 struct attribute_spec.handler. */
818 handle_noinline_attribute (tree
*node
, tree name
,
819 tree
ARG_UNUSED (args
),
820 int ARG_UNUSED (flags
), bool *no_add_attrs
)
822 if (TREE_CODE (*node
) == FUNCTION_DECL
)
824 if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (*node
)))
826 warning (OPT_Wattributes
, "%qE attribute ignored due to conflict "
827 "with attribute %qs", name
, "always_inline");
828 *no_add_attrs
= true;
831 DECL_UNINLINABLE (*node
) = 1;
835 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
836 *no_add_attrs
= true;
842 /* Handle a "noclone" attribute; arguments as in
843 struct attribute_spec.handler. */
846 handle_noclone_attribute (tree
*node
, tree name
,
847 tree
ARG_UNUSED (args
),
848 int ARG_UNUSED (flags
), bool *no_add_attrs
)
850 if (TREE_CODE (*node
) != FUNCTION_DECL
)
852 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
853 *no_add_attrs
= true;
859 /* Handle a "nocf_check" attribute; arguments as in
860 struct attribute_spec.handler. */
863 handle_nocf_check_attribute (tree
*node
, tree name
,
864 tree
ARG_UNUSED (args
),
865 int ARG_UNUSED (flags
), bool *no_add_attrs
)
867 if (TREE_CODE (*node
) != FUNCTION_TYPE
868 && TREE_CODE (*node
) != METHOD_TYPE
)
870 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
871 *no_add_attrs
= true;
873 else if (!(flag_cf_protection
& CF_BRANCH
))
875 warning (OPT_Wattributes
, "%qE attribute ignored. Use "
876 "-fcf-protection option to enable it", name
);
877 *no_add_attrs
= true;
883 /* Handle a "no_icf" attribute; arguments as in
884 struct attribute_spec.handler. */
887 handle_noicf_attribute (tree
*node
, tree name
,
888 tree
ARG_UNUSED (args
),
889 int ARG_UNUSED (flags
), bool *no_add_attrs
)
891 if (TREE_CODE (*node
) != FUNCTION_DECL
)
893 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
894 *no_add_attrs
= true;
901 /* Handle a "always_inline" attribute; arguments as in
902 struct attribute_spec.handler. */
905 handle_always_inline_attribute (tree
*node
, tree name
,
906 tree
ARG_UNUSED (args
),
907 int ARG_UNUSED (flags
),
910 if (TREE_CODE (*node
) == FUNCTION_DECL
)
912 if (lookup_attribute ("noinline", DECL_ATTRIBUTES (*node
)))
914 warning (OPT_Wattributes
, "%qE attribute ignored due to conflict "
915 "with %qs attribute", name
, "noinline");
916 *no_add_attrs
= true;
918 else if (lookup_attribute ("target_clones", DECL_ATTRIBUTES (*node
)))
920 warning (OPT_Wattributes
, "%qE attribute ignored due to conflict "
921 "with %qs attribute", name
, "target_clones");
922 *no_add_attrs
= true;
925 /* Set the attribute and mark it for disregarding inline
927 DECL_DISREGARD_INLINE_LIMITS (*node
) = 1;
931 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
932 *no_add_attrs
= true;
938 /* Handle a "gnu_inline" attribute; arguments as in
939 struct attribute_spec.handler. */
942 handle_gnu_inline_attribute (tree
*node
, tree name
,
943 tree
ARG_UNUSED (args
),
944 int ARG_UNUSED (flags
),
947 if (TREE_CODE (*node
) == FUNCTION_DECL
&& DECL_DECLARED_INLINE_P (*node
))
949 /* Do nothing else, just set the attribute. We'll get at
950 it later with lookup_attribute. */
954 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
955 *no_add_attrs
= true;
961 /* Handle a "leaf" attribute; arguments as in
962 struct attribute_spec.handler. */
965 handle_leaf_attribute (tree
*node
, tree name
,
966 tree
ARG_UNUSED (args
),
967 int ARG_UNUSED (flags
), bool *no_add_attrs
)
969 if (TREE_CODE (*node
) != FUNCTION_DECL
)
971 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
972 *no_add_attrs
= true;
974 if (!TREE_PUBLIC (*node
))
976 warning (OPT_Wattributes
, "%qE attribute has no effect on unit local "
978 *no_add_attrs
= true;
984 /* Handle an "artificial" attribute; arguments as in
985 struct attribute_spec.handler. */
988 handle_artificial_attribute (tree
*node
, tree name
,
989 tree
ARG_UNUSED (args
),
990 int ARG_UNUSED (flags
),
993 if (TREE_CODE (*node
) == FUNCTION_DECL
&& DECL_DECLARED_INLINE_P (*node
))
995 /* Do nothing else, just set the attribute. We'll get at
996 it later with lookup_attribute. */
1000 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
1001 *no_add_attrs
= true;
1007 /* Handle a "flatten" attribute; arguments as in
1008 struct attribute_spec.handler. */
1011 handle_flatten_attribute (tree
*node
, tree name
,
1012 tree args ATTRIBUTE_UNUSED
,
1013 int flags ATTRIBUTE_UNUSED
, bool *no_add_attrs
)
1015 if (TREE_CODE (*node
) == FUNCTION_DECL
)
1016 /* Do nothing else, just set the attribute. We'll get at
1017 it later with lookup_attribute. */
1021 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
1022 *no_add_attrs
= true;
1028 /* Handle a "warning" or "error" attribute; arguments as in
1029 struct attribute_spec.handler. */
1032 handle_error_attribute (tree
*node
, tree name
, tree args
,
1033 int ARG_UNUSED (flags
), bool *no_add_attrs
)
1035 if (TREE_CODE (*node
) == FUNCTION_DECL
1036 && TREE_CODE (TREE_VALUE (args
)) == STRING_CST
)
1037 /* Do nothing else, just set the attribute. We'll get at
1038 it later with lookup_attribute. */
1042 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
1043 *no_add_attrs
= true;
1049 /* Handle a "used" attribute; arguments as in
1050 struct attribute_spec.handler. */
1053 handle_used_attribute (tree
*pnode
, tree name
, tree
ARG_UNUSED (args
),
1054 int ARG_UNUSED (flags
), bool *no_add_attrs
)
1058 if (TREE_CODE (node
) == FUNCTION_DECL
1059 || (VAR_P (node
) && TREE_STATIC (node
))
1060 || (TREE_CODE (node
) == TYPE_DECL
))
1062 TREE_USED (node
) = 1;
1063 DECL_PRESERVE_P (node
) = 1;
1065 DECL_READ_P (node
) = 1;
1069 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
1070 *no_add_attrs
= true;
1076 /* Handle a "unused" attribute; arguments as in
1077 struct attribute_spec.handler. */
1080 handle_unused_attribute (tree
*node
, tree name
, tree
ARG_UNUSED (args
),
1081 int flags
, bool *no_add_attrs
)
1087 if (TREE_CODE (decl
) == PARM_DECL
1088 || VAR_OR_FUNCTION_DECL_P (decl
)
1089 || TREE_CODE (decl
) == LABEL_DECL
1090 || TREE_CODE (decl
) == CONST_DECL
1091 || TREE_CODE (decl
) == TYPE_DECL
)
1093 TREE_USED (decl
) = 1;
1094 if (VAR_P (decl
) || TREE_CODE (decl
) == PARM_DECL
)
1095 DECL_READ_P (decl
) = 1;
1099 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
1100 *no_add_attrs
= true;
1105 if (!(flags
& (int) ATTR_FLAG_TYPE_IN_PLACE
))
1106 *node
= build_variant_type_copy (*node
);
1107 TREE_USED (*node
) = 1;
1113 /* Handle a "externally_visible" attribute; arguments as in
1114 struct attribute_spec.handler. */
1117 handle_externally_visible_attribute (tree
*pnode
, tree name
,
1118 tree
ARG_UNUSED (args
),
1119 int ARG_UNUSED (flags
),
1124 if (VAR_OR_FUNCTION_DECL_P (node
))
1126 if ((!TREE_STATIC (node
) && TREE_CODE (node
) != FUNCTION_DECL
1127 && !DECL_EXTERNAL (node
)) || !TREE_PUBLIC (node
))
1129 warning (OPT_Wattributes
,
1130 "%qE attribute have effect only on public objects", name
);
1131 *no_add_attrs
= true;
1136 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
1137 *no_add_attrs
= true;
1143 /* Handle the "no_reorder" attribute. Arguments as in
1144 struct attribute_spec.handler. */
1147 handle_no_reorder_attribute (tree
*pnode
,
1155 if (!VAR_OR_FUNCTION_DECL_P (node
)
1156 && !(TREE_STATIC (node
) || DECL_EXTERNAL (node
)))
1158 warning (OPT_Wattributes
,
1159 "%qE attribute only affects top level objects",
1161 *no_add_attrs
= true;
1167 /* Handle a "const" attribute; arguments as in
1168 struct attribute_spec.handler. */
1171 handle_const_attribute (tree
*node
, tree name
, tree
ARG_UNUSED (args
),
1172 int flags
, bool *no_add_attrs
)
1174 tree type
= TREE_TYPE (*node
);
1176 /* See FIXME comment on noreturn in c_common_attribute_table. */
1177 if (TREE_CODE (*node
) == FUNCTION_DECL
)
1178 TREE_READONLY (*node
) = 1;
1179 else if (TREE_CODE (type
) == POINTER_TYPE
1180 && TREE_CODE (TREE_TYPE (type
)) == FUNCTION_TYPE
)
1182 = (build_qualified_type
1184 (build_type_variant (TREE_TYPE (type
), 1,
1185 TREE_THIS_VOLATILE (TREE_TYPE (type
)))),
1186 TYPE_QUALS (type
)));
1189 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
1190 *no_add_attrs
= true;
1193 /* void __builtin_unreachable(void) is const. Accept other such
1194 built-ins but warn on user-defined functions that return void. */
1195 if (!(flags
& ATTR_FLAG_BUILT_IN
)
1196 && TREE_CODE (*node
) == FUNCTION_DECL
1197 && VOID_TYPE_P (TREE_TYPE (type
)))
1198 warning (OPT_Wattributes
, "%qE attribute on function "
1199 "returning %<void%>", name
);
1204 /* Handle a "scalar_storage_order" attribute; arguments as in
1205 struct attribute_spec.handler. */
1208 handle_scalar_storage_order_attribute (tree
*node
, tree name
, tree args
,
1209 int flags
, bool *no_add_attrs
)
1211 tree id
= TREE_VALUE (args
);
1214 if (TREE_CODE (*node
) == TYPE_DECL
1215 && ! (flags
& ATTR_FLAG_CXX11
))
1216 node
= &TREE_TYPE (*node
);
1219 if (BYTES_BIG_ENDIAN
!= WORDS_BIG_ENDIAN
)
1221 error ("scalar_storage_order is not supported because endianness "
1226 if (RECORD_OR_UNION_TYPE_P (type
) && !c_dialect_cxx ())
1228 bool reverse
= false;
1230 if (TREE_CODE (id
) == STRING_CST
1231 && strcmp (TREE_STRING_POINTER (id
), "big-endian") == 0)
1232 reverse
= !BYTES_BIG_ENDIAN
;
1233 else if (TREE_CODE (id
) == STRING_CST
1234 && strcmp (TREE_STRING_POINTER (id
), "little-endian") == 0)
1235 reverse
= BYTES_BIG_ENDIAN
;
1238 error ("scalar_storage_order argument must be one of \"big-endian\""
1239 " or \"little-endian\"");
1243 if (!(flags
& (int) ATTR_FLAG_TYPE_IN_PLACE
))
1246 /* A type variant isn't good enough, since we don't want a cast
1247 to such a type to be removed as a no-op. */
1248 *node
= type
= build_duplicate_type (type
);
1251 TYPE_REVERSE_STORAGE_ORDER (type
) = reverse
;
1255 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
1256 *no_add_attrs
= true;
1260 /* Handle a "transparent_union" attribute; arguments as in
1261 struct attribute_spec.handler. */
1264 handle_transparent_union_attribute (tree
*node
, tree name
,
1265 tree
ARG_UNUSED (args
), int flags
,
1270 *no_add_attrs
= true;
1272 if (TREE_CODE (*node
) == TYPE_DECL
1273 && ! (flags
& ATTR_FLAG_CXX11
))
1274 node
= &TREE_TYPE (*node
);
1277 if (TREE_CODE (type
) == UNION_TYPE
)
1279 /* Make sure that the first field will work for a transparent union.
1280 If the type isn't complete yet, leave the check to the code in
1282 if (TYPE_SIZE (type
))
1284 tree first
= first_field (type
);
1285 if (first
== NULL_TREE
1286 || DECL_ARTIFICIAL (first
)
1287 || TYPE_MODE (type
) != DECL_MODE (first
))
1291 if (!(flags
& (int) ATTR_FLAG_TYPE_IN_PLACE
))
1293 /* If the type isn't complete yet, setting the flag
1294 on a variant wouldn't ever be checked. */
1295 if (!TYPE_SIZE (type
))
1298 /* build_duplicate_type doesn't work for C++. */
1299 if (c_dialect_cxx ())
1302 /* A type variant isn't good enough, since we don't want a cast
1303 to such a type to be removed as a no-op. */
1304 *node
= type
= build_duplicate_type (type
);
1307 for (tree t
= TYPE_MAIN_VARIANT (type
); t
; t
= TYPE_NEXT_VARIANT (t
))
1308 TYPE_TRANSPARENT_AGGR (t
) = 1;
1313 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
1317 /* Subroutine of handle_{con,de}structor_attribute. Evaluate ARGS to
1318 get the requested priority for a constructor or destructor,
1319 possibly issuing diagnostics for invalid or reserved
1322 static priority_type
1323 get_priority (tree args
, bool is_destructor
)
1329 return DEFAULT_INIT_PRIORITY
;
1331 if (!SUPPORTS_INIT_PRIORITY
)
1334 error ("destructor priorities are not supported");
1336 error ("constructor priorities are not supported");
1337 return DEFAULT_INIT_PRIORITY
;
1340 arg
= TREE_VALUE (args
);
1341 if (TREE_CODE (arg
) == IDENTIFIER_NODE
)
1343 if (arg
== error_mark_node
)
1344 return DEFAULT_INIT_PRIORITY
;
1345 arg
= default_conversion (arg
);
1346 if (!tree_fits_shwi_p (arg
)
1347 || !INTEGRAL_TYPE_P (TREE_TYPE (arg
)))
1350 pri
= tree_to_shwi (arg
);
1351 if (pri
< 0 || pri
> MAX_INIT_PRIORITY
)
1354 if (pri
<= MAX_RESERVED_INIT_PRIORITY
)
1358 "destructor priorities from 0 to %d are reserved "
1359 "for the implementation",
1360 MAX_RESERVED_INIT_PRIORITY
);
1363 "constructor priorities from 0 to %d are reserved "
1364 "for the implementation",
1365 MAX_RESERVED_INIT_PRIORITY
);
1371 error ("destructor priorities must be integers from 0 to %d inclusive",
1374 error ("constructor priorities must be integers from 0 to %d inclusive",
1376 return DEFAULT_INIT_PRIORITY
;
1379 /* Handle a "constructor" attribute; arguments as in
1380 struct attribute_spec.handler. */
1383 handle_constructor_attribute (tree
*node
, tree name
, tree args
,
1384 int ARG_UNUSED (flags
),
1388 tree type
= TREE_TYPE (decl
);
1390 if (TREE_CODE (decl
) == FUNCTION_DECL
1391 && TREE_CODE (type
) == FUNCTION_TYPE
1392 && decl_function_context (decl
) == 0)
1394 priority_type priority
;
1395 DECL_STATIC_CONSTRUCTOR (decl
) = 1;
1396 priority
= get_priority (args
, /*is_destructor=*/false);
1397 SET_DECL_INIT_PRIORITY (decl
, priority
);
1398 TREE_USED (decl
) = 1;
1402 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
1403 *no_add_attrs
= true;
1409 /* Handle a "destructor" attribute; arguments as in
1410 struct attribute_spec.handler. */
1413 handle_destructor_attribute (tree
*node
, tree name
, tree args
,
1414 int ARG_UNUSED (flags
),
1418 tree type
= TREE_TYPE (decl
);
1420 if (TREE_CODE (decl
) == FUNCTION_DECL
1421 && TREE_CODE (type
) == FUNCTION_TYPE
1422 && decl_function_context (decl
) == 0)
1424 priority_type priority
;
1425 DECL_STATIC_DESTRUCTOR (decl
) = 1;
1426 priority
= get_priority (args
, /*is_destructor=*/true);
1427 SET_DECL_FINI_PRIORITY (decl
, priority
);
1428 TREE_USED (decl
) = 1;
1432 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
1433 *no_add_attrs
= true;
1439 /* Nonzero if the mode is a valid vector mode for this architecture.
1440 This returns nonzero even if there is no hardware support for the
1441 vector mode, but we can emulate with narrower modes. */
1444 vector_mode_valid_p (machine_mode mode
)
1446 enum mode_class mclass
= GET_MODE_CLASS (mode
);
1448 /* Doh! What's going on? */
1449 if (mclass
!= MODE_VECTOR_INT
1450 && mclass
!= MODE_VECTOR_FLOAT
1451 && mclass
!= MODE_VECTOR_FRACT
1452 && mclass
!= MODE_VECTOR_UFRACT
1453 && mclass
!= MODE_VECTOR_ACCUM
1454 && mclass
!= MODE_VECTOR_UACCUM
)
1457 /* Hardware support. Woo hoo! */
1458 if (targetm
.vector_mode_supported_p (mode
))
1461 /* We should probably return 1 if requesting V4DI and we have no DI,
1462 but we have V2DI, but this is probably very unlikely. */
1464 /* If we have support for the inner mode, we can safely emulate it.
1465 We may not have V2DI, but me can emulate with a pair of DIs. */
1466 return targetm
.scalar_mode_supported_p (GET_MODE_INNER (mode
));
1470 /* Handle a "mode" attribute; arguments as in
1471 struct attribute_spec.handler. */
1474 handle_mode_attribute (tree
*node
, tree name
, tree args
,
1475 int ARG_UNUSED (flags
), bool *no_add_attrs
)
1478 tree ident
= TREE_VALUE (args
);
1480 *no_add_attrs
= true;
1482 if (TREE_CODE (ident
) != IDENTIFIER_NODE
)
1483 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
1487 const char *p
= IDENTIFIER_POINTER (ident
);
1488 int len
= strlen (p
);
1489 machine_mode mode
= VOIDmode
;
1493 if (len
> 4 && p
[0] == '_' && p
[1] == '_'
1494 && p
[len
- 1] == '_' && p
[len
- 2] == '_')
1496 char *newp
= (char *) alloca (len
- 1);
1498 strcpy (newp
, &p
[2]);
1499 newp
[len
- 4] = '\0';
1503 /* Change this type to have a type with the specified mode.
1504 First check for the special modes. */
1505 if (!strcmp (p
, "byte"))
1507 else if (!strcmp (p
, "word"))
1509 else if (!strcmp (p
, "pointer"))
1511 else if (!strcmp (p
, "libgcc_cmp_return"))
1512 mode
= targetm
.libgcc_cmp_return_mode ();
1513 else if (!strcmp (p
, "libgcc_shift_count"))
1514 mode
= targetm
.libgcc_shift_count_mode ();
1515 else if (!strcmp (p
, "unwind_word"))
1516 mode
= targetm
.unwind_word_mode ();
1518 for (j
= 0; j
< NUM_MACHINE_MODES
; j
++)
1519 if (!strcmp (p
, GET_MODE_NAME (j
)))
1521 mode
= (machine_mode
) j
;
1525 if (mode
== VOIDmode
)
1527 error ("unknown machine mode %qE", ident
);
1532 switch (GET_MODE_CLASS (mode
))
1535 case MODE_PARTIAL_INT
:
1537 case MODE_DECIMAL_FLOAT
:
1543 = targetm
.scalar_mode_supported_p (as_a
<scalar_mode
> (mode
));
1546 case MODE_COMPLEX_INT
:
1547 case MODE_COMPLEX_FLOAT
:
1548 valid_mode
= targetm
.scalar_mode_supported_p (GET_MODE_INNER (mode
));
1551 case MODE_VECTOR_INT
:
1552 case MODE_VECTOR_FLOAT
:
1553 case MODE_VECTOR_FRACT
:
1554 case MODE_VECTOR_UFRACT
:
1555 case MODE_VECTOR_ACCUM
:
1556 case MODE_VECTOR_UACCUM
:
1557 warning (OPT_Wattributes
, "specifying vector types with "
1558 "__attribute__ ((mode)) is deprecated");
1559 warning (OPT_Wattributes
,
1560 "use __attribute__ ((vector_size)) instead");
1561 valid_mode
= vector_mode_valid_p (mode
);
1569 error ("unable to emulate %qs", p
);
1573 if (POINTER_TYPE_P (type
))
1575 scalar_int_mode addr_mode
;
1576 addr_space_t as
= TYPE_ADDR_SPACE (TREE_TYPE (type
));
1577 tree (*fn
)(tree
, machine_mode
, bool);
1579 if (!is_a
<scalar_int_mode
> (mode
, &addr_mode
)
1580 || !targetm
.addr_space
.valid_pointer_mode (addr_mode
, as
))
1582 error ("invalid pointer mode %qs", p
);
1586 if (TREE_CODE (type
) == POINTER_TYPE
)
1587 fn
= build_pointer_type_for_mode
;
1589 fn
= build_reference_type_for_mode
;
1590 typefm
= fn (TREE_TYPE (type
), addr_mode
, false);
1594 /* For fixed-point modes, we need to test if the signness of type
1595 and the machine mode are consistent. */
1596 if (ALL_FIXED_POINT_MODE_P (mode
)
1597 && TYPE_UNSIGNED (type
) != UNSIGNED_FIXED_POINT_MODE_P (mode
))
1599 error ("signedness of type and machine mode %qs don%'t match", p
);
1602 /* For fixed-point modes, we need to pass saturating info. */
1603 typefm
= lang_hooks
.types
.type_for_mode (mode
,
1604 ALL_FIXED_POINT_MODE_P (mode
) ? TYPE_SATURATING (type
)
1605 : TYPE_UNSIGNED (type
));
1608 if (typefm
== NULL_TREE
)
1610 error ("no data type for mode %qs", p
);
1613 else if (TREE_CODE (type
) == ENUMERAL_TYPE
)
1615 /* For enumeral types, copy the precision from the integer
1616 type returned above. If not an INTEGER_TYPE, we can't use
1617 this mode for this type. */
1618 if (TREE_CODE (typefm
) != INTEGER_TYPE
)
1620 error ("cannot use mode %qs for enumeral types", p
);
1624 if (flags
& ATTR_FLAG_TYPE_IN_PLACE
)
1626 TYPE_PRECISION (type
) = TYPE_PRECISION (typefm
);
1631 /* We cannot build a type variant, as there's code that assumes
1632 that TYPE_MAIN_VARIANT has the same mode. This includes the
1633 debug generators. Instead, create a subrange type. This
1634 results in all of the enumeral values being emitted only once
1635 in the original, and the subtype gets them by reference. */
1636 if (TYPE_UNSIGNED (type
))
1637 typefm
= make_unsigned_type (TYPE_PRECISION (typefm
));
1639 typefm
= make_signed_type (TYPE_PRECISION (typefm
));
1640 TREE_TYPE (typefm
) = type
;
1643 else if (VECTOR_MODE_P (mode
)
1644 ? TREE_CODE (type
) != TREE_CODE (TREE_TYPE (typefm
))
1645 : TREE_CODE (type
) != TREE_CODE (typefm
))
1647 error ("mode %qs applied to inappropriate type", p
);
1651 *node
= build_qualified_type (typefm
, TYPE_QUALS (type
));
1657 /* Handle a "section" attribute; arguments as in
1658 struct attribute_spec.handler. */
1661 handle_section_attribute (tree
*node
, tree
ARG_UNUSED (name
), tree args
,
1662 int ARG_UNUSED (flags
), bool *no_add_attrs
)
1666 if (!targetm_common
.have_named_sections
)
1668 error_at (DECL_SOURCE_LOCATION (*node
),
1669 "section attributes are not supported for this target");
1673 if (!VAR_OR_FUNCTION_DECL_P (decl
))
1675 error ("section attribute not allowed for %q+D", *node
);
1679 if (TREE_CODE (TREE_VALUE (args
)) != STRING_CST
)
1681 error ("section attribute argument not a string constant");
1686 && current_function_decl
!= NULL_TREE
1687 && !TREE_STATIC (decl
))
1689 error_at (DECL_SOURCE_LOCATION (decl
),
1690 "section attribute cannot be specified for local variables");
1694 /* The decl may have already been given a section attribute
1695 from a previous declaration. Ensure they match. */
1696 if (DECL_SECTION_NAME (decl
) != NULL
1697 && strcmp (DECL_SECTION_NAME (decl
),
1698 TREE_STRING_POINTER (TREE_VALUE (args
))) != 0)
1700 error ("section of %q+D conflicts with previous declaration", *node
);
1705 && !targetm
.have_tls
&& targetm
.emutls
.tmpl_section
1706 && DECL_THREAD_LOCAL_P (decl
))
1708 error ("section of %q+D cannot be overridden", *node
);
1712 set_decl_section_name (decl
, TREE_STRING_POINTER (TREE_VALUE (args
)));
1716 *no_add_attrs
= true;
1720 /* If in c++-11, check if the c++-11 alignment constraint with respect
1721 to fundamental alignment (in [dcl.align]) are satisfied. If not in
1722 c++-11 mode, does nothing.
1726 [* if the constant expression evaluates to a fundamental alignment,
1727 the alignment requirement of the declared entity shall be the
1728 specified fundamental alignment.
1730 * if the constant expression evaluates to an extended alignment
1731 and the implementation supports that alignment in the context
1732 of the declaration, the alignment of the declared entity shall
1735 * if the constant expression evaluates to an extended alignment
1736 and the implementation does not support that alignment in the
1737 context of the declaration, the program is ill-formed]. */
1740 check_cxx_fundamental_alignment_constraints (tree node
,
1744 bool alignment_too_large_p
= false;
1745 unsigned requested_alignment
= (1U << align_log
) * BITS_PER_UNIT
;
1746 unsigned max_align
= 0;
1748 if ((!(flags
& ATTR_FLAG_CXX11
) && !warn_cxx_compat
)
1749 || (node
== NULL_TREE
|| node
== error_mark_node
))
1752 if (cxx_fundamental_alignment_p (requested_alignment
))
1757 if (TREE_STATIC (node
) || DECL_EXTERNAL (node
))
1758 /* For file scope variables and static members, the target supports
1759 alignments that are at most MAX_OFILE_ALIGNMENT. */
1760 max_align
= MAX_OFILE_ALIGNMENT
;
1762 /* For stack variables, the target supports at most
1763 MAX_STACK_ALIGNMENT. */
1764 max_align
= MAX_STACK_ALIGNMENT
;
1765 if (requested_alignment
> max_align
)
1766 alignment_too_large_p
= true;
1768 /* Let's be liberal for types and fields; don't limit their alignment any
1769 more than check_user_alignment already did. */
1771 if (alignment_too_large_p
)
1772 pedwarn (input_location
, OPT_Wattributes
,
1773 "requested alignment %d is larger than %d",
1774 requested_alignment
/ BITS_PER_UNIT
, max_align
/ BITS_PER_UNIT
);
1776 return !alignment_too_large_p
;
1779 /* Common codes shared by handle_warn_if_not_aligned_attribute and
1780 handle_aligned_attribute. */
1783 common_handle_aligned_attribute (tree
*node
, tree name
, tree args
, int flags
,
1785 bool warn_if_not_aligned_p
)
1787 tree decl
= NULL_TREE
;
1789 bool is_type
= false;
1792 /* The last (already pushed) declaration with all validated attributes
1793 merged in or the current about-to-be-pushed one if one hasn't been
1795 tree last_decl
= node
[1] ? node
[1] : *node
;
1799 align_expr
= TREE_VALUE (args
);
1800 if (align_expr
&& TREE_CODE (align_expr
) != IDENTIFIER_NODE
1801 && TREE_CODE (align_expr
) != FUNCTION_DECL
)
1802 align_expr
= default_conversion (align_expr
);
1805 align_expr
= size_int (ATTRIBUTE_ALIGNED_VALUE
/ BITS_PER_UNIT
);
1810 type
= &TREE_TYPE (decl
);
1811 is_type
= TREE_CODE (*node
) == TYPE_DECL
;
1813 else if (TYPE_P (*node
))
1814 type
= node
, is_type
= true;
1816 /* Log2 of specified alignment. */
1817 int pow2align
= check_user_alignment (align_expr
, true);
1819 || !check_cxx_fundamental_alignment_constraints (*node
, pow2align
, flags
))
1821 *no_add_attrs
= true;
1825 /* The alignment in bits corresponding to the specified alignment. */
1826 unsigned bitalign
= (1U << pow2align
) * BITS_PER_UNIT
;
1828 /* The alignment of the current declaration and that of the last
1829 pushed declaration, determined on demand below. */
1830 unsigned curalign
= 0;
1831 unsigned lastalign
= 0;
1835 if ((flags
& (int) ATTR_FLAG_TYPE_IN_PLACE
))
1836 /* OK, modify the type in place. */;
1837 /* If we have a TYPE_DECL, then copy the type, so that we
1838 don't accidentally modify a builtin type. See pushdecl. */
1839 else if (decl
&& TREE_TYPE (decl
) != error_mark_node
1840 && DECL_ORIGINAL_TYPE (decl
) == NULL_TREE
)
1842 tree tt
= TREE_TYPE (decl
);
1843 *type
= build_variant_type_copy (*type
);
1844 DECL_ORIGINAL_TYPE (decl
) = tt
;
1845 TYPE_NAME (*type
) = decl
;
1846 TREE_USED (*type
) = TREE_USED (decl
);
1847 TREE_TYPE (decl
) = *type
;
1850 *type
= build_variant_type_copy (*type
);
1852 if (warn_if_not_aligned_p
)
1854 SET_TYPE_WARN_IF_NOT_ALIGN (*type
, bitalign
);
1855 warn_if_not_aligned_p
= false;
1859 SET_TYPE_ALIGN (*type
, bitalign
);
1860 TYPE_USER_ALIGN (*type
) = 1;
1863 else if (! VAR_OR_FUNCTION_DECL_P (decl
)
1864 && TREE_CODE (decl
) != FIELD_DECL
)
1866 error ("alignment may not be specified for %q+D", decl
);
1867 *no_add_attrs
= true;
1869 else if (TREE_CODE (decl
) == FUNCTION_DECL
1870 && ((curalign
= DECL_ALIGN (decl
)) > bitalign
1871 || ((lastalign
= DECL_ALIGN (last_decl
)) > bitalign
)))
1873 /* Either a prior attribute on the same declaration or one
1874 on a prior declaration of the same function specifies
1875 stricter alignment than this attribute. */
1876 bool note
= lastalign
!= 0;
1878 curalign
= lastalign
;
1880 curalign
/= BITS_PER_UNIT
;
1881 bitalign
/= BITS_PER_UNIT
;
1884 if (DECL_USER_ALIGN (decl
) || DECL_USER_ALIGN (last_decl
))
1885 diagd
= warning (OPT_Wattributes
,
1886 "ignoring attribute %<%E (%u)%> because it conflicts "
1887 "with attribute %<%E (%u)%>",
1888 name
, bitalign
, name
, curalign
);
1889 else if (!warn_if_not_aligned_p
)
1890 /* Do not error out for attribute warn_if_not_aligned. */
1891 error ("alignment for %q+D must be at least %d", decl
, curalign
);
1894 inform (DECL_SOURCE_LOCATION (last_decl
), "previous declaration here");
1896 *no_add_attrs
= true;
1898 else if (DECL_USER_ALIGN (decl
)
1899 && DECL_ALIGN (decl
) > bitalign
)
1900 /* C++-11 [dcl.align/4]:
1902 When multiple alignment-specifiers are specified for an
1903 entity, the alignment requirement shall be set to the
1904 strictest specified alignment.
1906 This formally comes from the c++11 specification but we are
1907 doing it for the GNU attribute syntax as well. */
1908 *no_add_attrs
= true;
1909 else if (!warn_if_not_aligned_p
1910 && TREE_CODE (decl
) == FUNCTION_DECL
1911 && DECL_ALIGN (decl
) > bitalign
)
1913 /* Don't warn function alignment here if warn_if_not_aligned_p is
1914 true. It will be warned later. */
1915 if (DECL_USER_ALIGN (decl
))
1916 error ("alignment for %q+D was previously specified as %d "
1917 "and may not be decreased", decl
,
1918 DECL_ALIGN (decl
) / BITS_PER_UNIT
);
1920 error ("alignment for %q+D must be at least %d", decl
,
1921 DECL_ALIGN (decl
) / BITS_PER_UNIT
);
1922 *no_add_attrs
= true;
1926 if (warn_if_not_aligned_p
)
1928 if (TREE_CODE (decl
) == FIELD_DECL
&& !DECL_C_BIT_FIELD (decl
))
1930 SET_DECL_WARN_IF_NOT_ALIGN (decl
, bitalign
);
1931 warn_if_not_aligned_p
= false;
1936 SET_DECL_ALIGN (decl
, bitalign
);
1937 DECL_USER_ALIGN (decl
) = 1;
1941 if (warn_if_not_aligned_p
)
1943 error ("%<warn_if_not_aligned%> may not be specified for %q+D",
1945 *no_add_attrs
= true;
1951 /* Handle a "aligned" attribute; arguments as in
1952 struct attribute_spec.handler. */
1955 handle_aligned_attribute (tree
*node
, tree name
, tree args
,
1956 int flags
, bool *no_add_attrs
)
1958 return common_handle_aligned_attribute (node
, name
, args
, flags
,
1959 no_add_attrs
, false);
1962 /* Handle a "warn_if_not_aligned" attribute; arguments as in
1963 struct attribute_spec.handler. */
1966 handle_warn_if_not_aligned_attribute (tree
*node
, tree name
,
1967 tree args
, int flags
,
1970 return common_handle_aligned_attribute (node
, name
, args
, flags
,
1971 no_add_attrs
, true);
1974 /* Handle a "weak" attribute; arguments as in
1975 struct attribute_spec.handler. */
1978 handle_weak_attribute (tree
*node
, tree name
,
1979 tree
ARG_UNUSED (args
),
1980 int ARG_UNUSED (flags
),
1981 bool * ARG_UNUSED (no_add_attrs
))
1983 if (TREE_CODE (*node
) == FUNCTION_DECL
1984 && DECL_DECLARED_INLINE_P (*node
))
1986 warning (OPT_Wattributes
, "inline function %q+D declared weak", *node
);
1987 *no_add_attrs
= true;
1989 else if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (*node
)))
1991 error ("indirect function %q+D cannot be declared weak", *node
);
1992 *no_add_attrs
= true;
1995 else if (VAR_OR_FUNCTION_DECL_P (*node
))
1996 declare_weak (*node
);
1998 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
2003 /* Handle a "noplt" attribute; arguments as in
2004 struct attribute_spec.handler. */
2007 handle_noplt_attribute (tree
*node
, tree name
,
2008 tree
ARG_UNUSED (args
),
2009 int ARG_UNUSED (flags
),
2010 bool * ARG_UNUSED (no_add_attrs
))
2012 if (TREE_CODE (*node
) != FUNCTION_DECL
)
2014 warning (OPT_Wattributes
,
2015 "%qE attribute is only applicable on functions", name
);
2016 *no_add_attrs
= true;
2022 /* Handle an "alias" or "ifunc" attribute; arguments as in
2023 struct attribute_spec.handler, except that IS_ALIAS tells us
2024 whether this is an alias as opposed to ifunc attribute. */
2027 handle_alias_ifunc_attribute (bool is_alias
, tree
*node
, tree name
, tree args
,
2032 if (TREE_CODE (decl
) != FUNCTION_DECL
2033 && (!is_alias
|| !VAR_P (decl
)))
2035 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
2036 *no_add_attrs
= true;
2038 else if ((TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_INITIAL (decl
))
2039 || (TREE_CODE (decl
) != FUNCTION_DECL
2040 && TREE_PUBLIC (decl
) && !DECL_EXTERNAL (decl
))
2041 /* A static variable declaration is always a tentative definition,
2042 but the alias is a non-tentative definition which overrides. */
2043 || (TREE_CODE (decl
) != FUNCTION_DECL
2044 && ! TREE_PUBLIC (decl
) && DECL_INITIAL (decl
)))
2046 error ("%q+D defined both normally and as %qE attribute", decl
, name
);
2047 *no_add_attrs
= true;
2051 && (lookup_attribute ("weak", DECL_ATTRIBUTES (decl
))
2052 || lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
))))
2054 error ("weak %q+D cannot be defined %qE", decl
, name
);
2055 *no_add_attrs
= true;
2059 /* Note that the very first time we process a nested declaration,
2060 decl_function_context will not be set. Indeed, *would* never
2061 be set except for the DECL_INITIAL/DECL_EXTERNAL frobbery that
2062 we do below. After such frobbery, pushdecl would set the context.
2063 In any case, this is never what we want. */
2064 else if (decl_function_context (decl
) == 0 && current_function_decl
== NULL
)
2068 id
= TREE_VALUE (args
);
2069 if (TREE_CODE (id
) != STRING_CST
)
2071 error ("attribute %qE argument not a string", name
);
2072 *no_add_attrs
= true;
2075 id
= get_identifier (TREE_STRING_POINTER (id
));
2076 /* This counts as a use of the object pointed to. */
2079 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2080 DECL_INITIAL (decl
) = error_mark_node
;
2082 TREE_STATIC (decl
) = 1;
2086 /* ifuncs are also aliases, so set that attribute too. */
2087 DECL_ATTRIBUTES (decl
)
2088 = tree_cons (get_identifier ("alias"), args
,
2089 DECL_ATTRIBUTES (decl
));
2090 DECL_ATTRIBUTES (decl
) = tree_cons (get_identifier ("ifunc"),
2091 NULL
, DECL_ATTRIBUTES (decl
));
2096 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
2097 *no_add_attrs
= true;
2100 if (decl_in_symtab_p (*node
))
2102 struct symtab_node
*n
= symtab_node::get (decl
);
2103 if (n
&& n
->refuse_visibility_changes
)
2106 error ("%+qD declared alias after being used", decl
);
2108 error ("%+qD declared ifunc after being used", decl
);
2116 /* Handle an "alias" or "ifunc" attribute; arguments as in
2117 struct attribute_spec.handler. */
2120 handle_ifunc_attribute (tree
*node
, tree name
, tree args
,
2121 int ARG_UNUSED (flags
), bool *no_add_attrs
)
2123 return handle_alias_ifunc_attribute (false, node
, name
, args
, no_add_attrs
);
2126 /* Handle an "alias" or "ifunc" attribute; arguments as in
2127 struct attribute_spec.handler. */
2130 handle_alias_attribute (tree
*node
, tree name
, tree args
,
2131 int ARG_UNUSED (flags
), bool *no_add_attrs
)
2133 return handle_alias_ifunc_attribute (true, node
, name
, args
, no_add_attrs
);
2136 /* Handle a "weakref" attribute; arguments as in struct
2137 attribute_spec.handler. */
2140 handle_weakref_attribute (tree
*node
, tree
ARG_UNUSED (name
), tree args
,
2141 int flags
, bool *no_add_attrs
)
2143 tree attr
= NULL_TREE
;
2145 /* We must ignore the attribute when it is associated with
2146 local-scoped decls, since attribute alias is ignored and many
2147 such symbols do not even have a DECL_WEAK field. */
2148 if (decl_function_context (*node
)
2149 || current_function_decl
2150 || !VAR_OR_FUNCTION_DECL_P (*node
))
2152 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
2153 *no_add_attrs
= true;
2157 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (*node
)))
2159 error ("indirect function %q+D cannot be declared weakref", *node
);
2160 *no_add_attrs
= true;
2164 /* The idea here is that `weakref("name")' mutates into `weakref,
2165 alias("name")', and weakref without arguments, in turn,
2166 implicitly adds weak. */
2170 attr
= tree_cons (get_identifier ("alias"), args
, attr
);
2171 attr
= tree_cons (get_identifier ("weakref"), NULL_TREE
, attr
);
2173 *no_add_attrs
= true;
2175 decl_attributes (node
, attr
, flags
);
2179 if (lookup_attribute ("alias", DECL_ATTRIBUTES (*node
)))
2180 error_at (DECL_SOURCE_LOCATION (*node
),
2181 "weakref attribute must appear before alias attribute");
2183 /* Can't call declare_weak because it wants this to be TREE_PUBLIC,
2184 and that isn't supported; and because it wants to add it to
2185 the list of weak decls, which isn't helpful. */
2186 DECL_WEAK (*node
) = 1;
2189 if (decl_in_symtab_p (*node
))
2191 struct symtab_node
*n
= symtab_node::get (*node
);
2192 if (n
&& n
->refuse_visibility_changes
)
2193 error ("%+qD declared weakref after being used", *node
);
2199 /* Handle an "visibility" attribute; arguments as in
2200 struct attribute_spec.handler. */
2203 handle_visibility_attribute (tree
*node
, tree name
, tree args
,
2204 int ARG_UNUSED (flags
),
2205 bool *ARG_UNUSED (no_add_attrs
))
2208 tree id
= TREE_VALUE (args
);
2209 enum symbol_visibility vis
;
2213 if (TREE_CODE (*node
) == ENUMERAL_TYPE
)
2215 else if (!RECORD_OR_UNION_TYPE_P (*node
))
2217 warning (OPT_Wattributes
, "%qE attribute ignored on non-class types",
2221 else if (TYPE_FIELDS (*node
))
2223 error ("%qE attribute ignored because %qT is already defined",
2228 else if (decl_function_context (decl
) != 0 || !TREE_PUBLIC (decl
))
2230 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
2234 if (TREE_CODE (id
) != STRING_CST
)
2236 error ("visibility argument not a string");
2240 /* If this is a type, set the visibility on the type decl. */
2243 decl
= TYPE_NAME (decl
);
2246 if (TREE_CODE (decl
) == IDENTIFIER_NODE
)
2248 warning (OPT_Wattributes
, "%qE attribute ignored on types",
2254 if (strcmp (TREE_STRING_POINTER (id
), "default") == 0)
2255 vis
= VISIBILITY_DEFAULT
;
2256 else if (strcmp (TREE_STRING_POINTER (id
), "internal") == 0)
2257 vis
= VISIBILITY_INTERNAL
;
2258 else if (strcmp (TREE_STRING_POINTER (id
), "hidden") == 0)
2259 vis
= VISIBILITY_HIDDEN
;
2260 else if (strcmp (TREE_STRING_POINTER (id
), "protected") == 0)
2261 vis
= VISIBILITY_PROTECTED
;
2264 error ("visibility argument must be one of \"default\", \"hidden\", \"protected\" or \"internal\"");
2265 vis
= VISIBILITY_DEFAULT
;
2268 if (DECL_VISIBILITY_SPECIFIED (decl
)
2269 && vis
!= DECL_VISIBILITY (decl
))
2271 tree attributes
= (TYPE_P (*node
)
2272 ? TYPE_ATTRIBUTES (*node
)
2273 : DECL_ATTRIBUTES (decl
));
2274 if (lookup_attribute ("visibility", attributes
))
2275 error ("%qD redeclared with different visibility", decl
);
2276 else if (TARGET_DLLIMPORT_DECL_ATTRIBUTES
2277 && lookup_attribute ("dllimport", attributes
))
2278 error ("%qD was declared %qs which implies default visibility",
2280 else if (TARGET_DLLIMPORT_DECL_ATTRIBUTES
2281 && lookup_attribute ("dllexport", attributes
))
2282 error ("%qD was declared %qs which implies default visibility",
2286 DECL_VISIBILITY (decl
) = vis
;
2287 DECL_VISIBILITY_SPECIFIED (decl
) = 1;
2289 /* Go ahead and attach the attribute to the node as well. This is needed
2290 so we can determine whether we have VISIBILITY_DEFAULT because the
2291 visibility was not specified, or because it was explicitly overridden
2292 from the containing scope. */
2297 /* Handle an "tls_model" attribute; arguments as in
2298 struct attribute_spec.handler. */
2301 handle_tls_model_attribute (tree
*node
, tree name
, tree args
,
2302 int ARG_UNUSED (flags
), bool *no_add_attrs
)
2306 enum tls_model kind
;
2308 *no_add_attrs
= true;
2310 if (!VAR_P (decl
) || !DECL_THREAD_LOCAL_P (decl
))
2312 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
2316 kind
= DECL_TLS_MODEL (decl
);
2317 id
= TREE_VALUE (args
);
2318 if (TREE_CODE (id
) != STRING_CST
)
2320 error ("tls_model argument not a string");
2324 if (!strcmp (TREE_STRING_POINTER (id
), "local-exec"))
2325 kind
= TLS_MODEL_LOCAL_EXEC
;
2326 else if (!strcmp (TREE_STRING_POINTER (id
), "initial-exec"))
2327 kind
= TLS_MODEL_INITIAL_EXEC
;
2328 else if (!strcmp (TREE_STRING_POINTER (id
), "local-dynamic"))
2329 kind
= optimize
? TLS_MODEL_LOCAL_DYNAMIC
: TLS_MODEL_GLOBAL_DYNAMIC
;
2330 else if (!strcmp (TREE_STRING_POINTER (id
), "global-dynamic"))
2331 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
2333 error ("tls_model argument must be one of \"local-exec\", \"initial-exec\", \"local-dynamic\" or \"global-dynamic\"");
2335 set_decl_tls_model (decl
, kind
);
2339 /* Handle a "no_instrument_function" attribute; arguments as in
2340 struct attribute_spec.handler. */
2343 handle_no_instrument_function_attribute (tree
*node
, tree name
,
2344 tree
ARG_UNUSED (args
),
2345 int ARG_UNUSED (flags
),
2350 if (TREE_CODE (decl
) != FUNCTION_DECL
)
2352 error_at (DECL_SOURCE_LOCATION (decl
),
2353 "%qE attribute applies only to functions", name
);
2354 *no_add_attrs
= true;
2357 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (decl
) = 1;
2362 /* Handle a "no_profile_instrument_function" attribute; arguments as in
2363 struct attribute_spec.handler. */
2366 handle_no_profile_instrument_function_attribute (tree
*node
, tree name
, tree
,
2367 int, bool *no_add_attrs
)
2369 if (TREE_CODE (*node
) != FUNCTION_DECL
)
2371 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
2372 *no_add_attrs
= true;
2378 /* Handle a "malloc" attribute; arguments as in
2379 struct attribute_spec.handler. */
2382 handle_malloc_attribute (tree
*node
, tree name
, tree
ARG_UNUSED (args
),
2383 int ARG_UNUSED (flags
), bool *no_add_attrs
)
2385 if (TREE_CODE (*node
) == FUNCTION_DECL
2386 && POINTER_TYPE_P (TREE_TYPE (TREE_TYPE (*node
))))
2387 DECL_IS_MALLOC (*node
) = 1;
2390 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
2391 *no_add_attrs
= true;
2397 /* Handle a "alloc_size" attribute; arguments as in
2398 struct attribute_spec.handler. */
2401 handle_alloc_size_attribute (tree
*node
, tree
ARG_UNUSED (name
), tree args
,
2402 int ARG_UNUSED (flags
), bool *no_add_attrs
)
2404 unsigned arg_count
= type_num_arguments (*node
);
2405 for (; args
; args
= TREE_CHAIN (args
))
2407 tree position
= TREE_VALUE (args
);
2408 if (position
&& TREE_CODE (position
) != IDENTIFIER_NODE
2409 && TREE_CODE (position
) != FUNCTION_DECL
)
2410 position
= default_conversion (position
);
2412 if (!tree_fits_uhwi_p (position
)
2414 || !IN_RANGE (tree_to_uhwi (position
), 1, arg_count
))
2416 warning (OPT_Wattributes
,
2417 "alloc_size parameter outside range");
2418 *no_add_attrs
= true;
2425 /* Handle a "alloc_align" attribute; arguments as in
2426 struct attribute_spec.handler. */
2429 handle_alloc_align_attribute (tree
*node
, tree
, tree args
, int,
2432 unsigned arg_count
= type_num_arguments (*node
);
2433 tree position
= TREE_VALUE (args
);
2434 if (position
&& TREE_CODE (position
) != IDENTIFIER_NODE
2435 && TREE_CODE (position
) != FUNCTION_DECL
)
2436 position
= default_conversion (position
);
2438 if (!tree_fits_uhwi_p (position
)
2440 || !IN_RANGE (tree_to_uhwi (position
), 1, arg_count
))
2442 warning (OPT_Wattributes
,
2443 "alloc_align parameter outside range");
2444 *no_add_attrs
= true;
2450 /* Handle a "assume_aligned" attribute; arguments as in
2451 struct attribute_spec.handler. */
2454 handle_assume_aligned_attribute (tree
*, tree
, tree args
, int,
2457 for (; args
; args
= TREE_CHAIN (args
))
2459 tree position
= TREE_VALUE (args
);
2460 if (position
&& TREE_CODE (position
) != IDENTIFIER_NODE
2461 && TREE_CODE (position
) != FUNCTION_DECL
)
2462 position
= default_conversion (position
);
2464 if (TREE_CODE (position
) != INTEGER_CST
)
2466 warning (OPT_Wattributes
,
2467 "assume_aligned parameter not integer constant");
2468 *no_add_attrs
= true;
2475 /* Handle a "fn spec" attribute; arguments as in
2476 struct attribute_spec.handler. */
2479 handle_fnspec_attribute (tree
*node ATTRIBUTE_UNUSED
, tree
ARG_UNUSED (name
),
2480 tree args
, int ARG_UNUSED (flags
),
2481 bool *no_add_attrs ATTRIBUTE_UNUSED
)
2484 && TREE_CODE (TREE_VALUE (args
)) == STRING_CST
2485 && !TREE_CHAIN (args
));
2489 /* Handle a "bnd_variable_size" attribute; arguments as in
2490 struct attribute_spec.handler. */
2493 handle_bnd_variable_size_attribute (tree
*node
, tree name
, tree
ARG_UNUSED (args
),
2494 int ARG_UNUSED (flags
), bool *no_add_attrs
)
2496 if (TREE_CODE (*node
) != FIELD_DECL
)
2498 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
2499 *no_add_attrs
= true;
2505 /* Handle a "bnd_legacy" attribute; arguments as in
2506 struct attribute_spec.handler. */
2509 handle_bnd_legacy (tree
*node
, tree name
, tree
ARG_UNUSED (args
),
2510 int ARG_UNUSED (flags
), bool *no_add_attrs
)
2512 if (TREE_CODE (*node
) != FUNCTION_DECL
)
2514 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
2515 *no_add_attrs
= true;
2521 /* Handle a "bnd_instrument" attribute; arguments as in
2522 struct attribute_spec.handler. */
2525 handle_bnd_instrument (tree
*node
, tree name
, tree
ARG_UNUSED (args
),
2526 int ARG_UNUSED (flags
), bool *no_add_attrs
)
2528 if (TREE_CODE (*node
) != FUNCTION_DECL
)
2530 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
2531 *no_add_attrs
= true;
2537 /* Handle a "warn_unused" attribute; arguments as in
2538 struct attribute_spec.handler. */
2541 handle_warn_unused_attribute (tree
*node
, tree name
,
2542 tree args ATTRIBUTE_UNUSED
,
2543 int flags ATTRIBUTE_UNUSED
, bool *no_add_attrs
)
2546 /* Do nothing else, just set the attribute. We'll get at
2547 it later with lookup_attribute. */
2551 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
2552 *no_add_attrs
= true;
2558 /* Handle an "omp declare simd" attribute; arguments as in
2559 struct attribute_spec.handler. */
2562 handle_omp_declare_simd_attribute (tree
*, tree
, tree
, int, bool *)
2567 /* Handle a "simd" attribute. */
2570 handle_simd_attribute (tree
*node
, tree name
, tree args
, int, bool *no_add_attrs
)
2572 if (TREE_CODE (*node
) == FUNCTION_DECL
)
2574 tree t
= get_identifier ("omp declare simd");
2575 tree attr
= NULL_TREE
;
2578 tree id
= TREE_VALUE (args
);
2580 if (TREE_CODE (id
) != STRING_CST
)
2582 error ("attribute %qE argument not a string", name
);
2583 *no_add_attrs
= true;
2587 if (strcmp (TREE_STRING_POINTER (id
), "notinbranch") == 0)
2588 attr
= build_omp_clause (DECL_SOURCE_LOCATION (*node
),
2589 OMP_CLAUSE_NOTINBRANCH
);
2590 else if (strcmp (TREE_STRING_POINTER (id
), "inbranch") == 0)
2591 attr
= build_omp_clause (DECL_SOURCE_LOCATION (*node
),
2592 OMP_CLAUSE_INBRANCH
);
2595 error ("only %<inbranch%> and %<notinbranch%> flags are "
2596 "allowed for %<__simd__%> attribute");
2597 *no_add_attrs
= true;
2602 DECL_ATTRIBUTES (*node
)
2603 = tree_cons (t
, build_tree_list (NULL_TREE
, attr
),
2604 DECL_ATTRIBUTES (*node
));
2608 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
2609 *no_add_attrs
= true;
2615 /* Handle an "omp declare target" attribute; arguments as in
2616 struct attribute_spec.handler. */
2619 handle_omp_declare_target_attribute (tree
*, tree
, tree
, int, bool *)
2624 /* Handle a "returns_twice" attribute; arguments as in
2625 struct attribute_spec.handler. */
2628 handle_returns_twice_attribute (tree
*node
, tree name
, tree
ARG_UNUSED (args
),
2629 int ARG_UNUSED (flags
), bool *no_add_attrs
)
2631 if (TREE_CODE (*node
) == FUNCTION_DECL
)
2632 DECL_IS_RETURNS_TWICE (*node
) = 1;
2635 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
2636 *no_add_attrs
= true;
2642 /* Handle a "no_limit_stack" attribute; arguments as in
2643 struct attribute_spec.handler. */
2646 handle_no_limit_stack_attribute (tree
*node
, tree name
,
2647 tree
ARG_UNUSED (args
),
2648 int ARG_UNUSED (flags
),
2653 if (TREE_CODE (decl
) != FUNCTION_DECL
)
2655 error_at (DECL_SOURCE_LOCATION (decl
),
2656 "%qE attribute applies only to functions", name
);
2657 *no_add_attrs
= true;
2659 else if (DECL_INITIAL (decl
))
2661 error_at (DECL_SOURCE_LOCATION (decl
),
2662 "can%'t set %qE attribute after definition", name
);
2663 *no_add_attrs
= true;
2666 DECL_NO_LIMIT_STACK (decl
) = 1;
2671 /* Handle a "pure" attribute; arguments as in
2672 struct attribute_spec.handler. */
2675 handle_pure_attribute (tree
*node
, tree name
, tree
ARG_UNUSED (args
),
2676 int ARG_UNUSED (flags
), bool *no_add_attrs
)
2678 if (TREE_CODE (*node
) == FUNCTION_DECL
)
2680 tree type
= TREE_TYPE (*node
);
2681 if (VOID_TYPE_P (TREE_TYPE (type
)))
2682 warning (OPT_Wattributes
, "%qE attribute on function "
2683 "returning %<void%>", name
);
2685 DECL_PURE_P (*node
) = 1;
2686 /* ??? TODO: Support types. */
2690 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
2691 *no_add_attrs
= true;
2697 /* Digest an attribute list destined for a transactional memory statement.
2698 ALLOWED is the set of attributes that are allowed for this statement;
2699 return the attribute we parsed. Multiple attributes are never allowed. */
2702 parse_tm_stmt_attr (tree attrs
, int allowed
)
2707 for ( ; attrs
; attrs
= TREE_CHAIN (attrs
))
2709 tree a
= TREE_PURPOSE (attrs
);
2712 if (is_attribute_p ("outer", a
))
2713 m
= TM_STMT_ATTR_OUTER
;
2715 if ((m
& allowed
) == 0)
2717 warning (OPT_Wattributes
, "%qE attribute directive ignored", a
);
2726 else if (m_seen
== m
)
2727 warning (OPT_Wattributes
, "%qE attribute duplicated", a
);
2729 warning (OPT_Wattributes
, "%qE attribute follows %qE", a
, a_seen
);
2735 /* Transform a TM attribute name into a maskable integer and back.
2736 Note that NULL (i.e. no attribute) is mapped to UNKNOWN, corresponding
2737 to how the lack of an attribute is treated. */
2740 tm_attr_to_mask (tree attr
)
2744 if (is_attribute_p ("transaction_safe", attr
))
2745 return TM_ATTR_SAFE
;
2746 if (is_attribute_p ("transaction_callable", attr
))
2747 return TM_ATTR_CALLABLE
;
2748 if (is_attribute_p ("transaction_pure", attr
))
2749 return TM_ATTR_PURE
;
2750 if (is_attribute_p ("transaction_unsafe", attr
))
2751 return TM_ATTR_IRREVOCABLE
;
2752 if (is_attribute_p ("transaction_may_cancel_outer", attr
))
2753 return TM_ATTR_MAY_CANCEL_OUTER
;
2758 tm_mask_to_attr (int mask
)
2764 str
= "transaction_safe";
2766 case TM_ATTR_CALLABLE
:
2767 str
= "transaction_callable";
2770 str
= "transaction_pure";
2772 case TM_ATTR_IRREVOCABLE
:
2773 str
= "transaction_unsafe";
2775 case TM_ATTR_MAY_CANCEL_OUTER
:
2776 str
= "transaction_may_cancel_outer";
2781 return get_identifier (str
);
2784 /* Return the first TM attribute seen in LIST. */
2787 find_tm_attribute (tree list
)
2789 for (; list
; list
= TREE_CHAIN (list
))
2791 tree name
= TREE_PURPOSE (list
);
2792 if (tm_attr_to_mask (name
) != 0)
2798 /* Handle the TM attributes; arguments as in struct attribute_spec.handler.
2799 Here we accept only function types, and verify that none of the other
2800 function TM attributes are also applied. */
2801 /* ??? We need to accept class types for C++, but not C. This greatly
2802 complicates this function, since we can no longer rely on the extra
2803 processing given by function_type_required. */
2806 handle_tm_attribute (tree
*node
, tree name
, tree args
,
2807 int flags
, bool *no_add_attrs
)
2809 /* Only one path adds the attribute; others don't. */
2810 *no_add_attrs
= true;
2812 switch (TREE_CODE (*node
))
2816 /* Only tm_callable and tm_safe apply to classes. */
2817 if (tm_attr_to_mask (name
) & ~(TM_ATTR_SAFE
| TM_ATTR_CALLABLE
))
2824 tree old_name
= find_tm_attribute (TYPE_ATTRIBUTES (*node
));
2825 if (old_name
== name
)
2827 else if (old_name
!= NULL_TREE
)
2828 error ("type was previously declared %qE", old_name
);
2830 *no_add_attrs
= false;
2836 /* transaction_safe_dynamic goes on the FUNCTION_DECL, but we also
2837 want to set transaction_safe on the type. */
2838 gcc_assert (is_attribute_p ("transaction_safe_dynamic", name
));
2839 if (!TYPE_P (DECL_CONTEXT (*node
)))
2840 error_at (DECL_SOURCE_LOCATION (*node
),
2841 "%<transaction_safe_dynamic%> may only be specified for "
2842 "a virtual function");
2843 *no_add_attrs
= false;
2844 decl_attributes (&TREE_TYPE (*node
),
2845 build_tree_list (get_identifier ("transaction_safe"),
2853 enum tree_code subcode
= TREE_CODE (TREE_TYPE (*node
));
2854 if (subcode
== FUNCTION_TYPE
|| subcode
== METHOD_TYPE
)
2856 tree fn_tmp
= TREE_TYPE (*node
);
2857 decl_attributes (&fn_tmp
, tree_cons (name
, args
, NULL
), 0);
2858 *node
= build_pointer_type (fn_tmp
);
2865 /* If a function is next, pass it on to be tried next. */
2866 if (flags
& (int) ATTR_FLAG_FUNCTION_NEXT
)
2867 return tree_cons (name
, args
, NULL
);
2870 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
2877 /* Handle the TM_WRAP attribute; arguments as in
2878 struct attribute_spec.handler. */
2881 handle_tm_wrap_attribute (tree
*node
, tree name
, tree args
,
2882 int ARG_UNUSED (flags
), bool *no_add_attrs
)
2886 /* We don't need the attribute even on success, since we
2887 record the entry in an external table. */
2888 *no_add_attrs
= true;
2890 if (TREE_CODE (decl
) != FUNCTION_DECL
)
2891 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
2894 tree wrap_decl
= TREE_VALUE (args
);
2895 if (error_operand_p (wrap_decl
))
2897 else if (TREE_CODE (wrap_decl
) != IDENTIFIER_NODE
2898 && !VAR_OR_FUNCTION_DECL_P (wrap_decl
))
2899 error ("%qE argument not an identifier", name
);
2902 if (TREE_CODE (wrap_decl
) == IDENTIFIER_NODE
)
2903 wrap_decl
= lookup_name (wrap_decl
);
2904 if (wrap_decl
&& TREE_CODE (wrap_decl
) == FUNCTION_DECL
)
2906 if (lang_hooks
.types_compatible_p (TREE_TYPE (decl
),
2907 TREE_TYPE (wrap_decl
)))
2908 record_tm_replacement (wrap_decl
, decl
);
2910 error ("%qD is not compatible with %qD", wrap_decl
, decl
);
2913 error ("%qE argument is not a function", name
);
2920 /* Ignore the given attribute. Used when this attribute may be usefully
2921 overridden by the target, but is not used generically. */
2924 ignore_attribute (tree
* ARG_UNUSED (node
), tree
ARG_UNUSED (name
),
2925 tree
ARG_UNUSED (args
), int ARG_UNUSED (flags
),
2928 *no_add_attrs
= true;
2932 /* Handle a "no vops" attribute; arguments as in
2933 struct attribute_spec.handler. */
2936 handle_novops_attribute (tree
*node
, tree
ARG_UNUSED (name
),
2937 tree
ARG_UNUSED (args
), int ARG_UNUSED (flags
),
2938 bool *ARG_UNUSED (no_add_attrs
))
2940 gcc_assert (TREE_CODE (*node
) == FUNCTION_DECL
);
2941 DECL_IS_NOVOPS (*node
) = 1;
2945 /* Handle a "deprecated" attribute; arguments as in
2946 struct attribute_spec.handler. */
2949 handle_deprecated_attribute (tree
*node
, tree name
,
2950 tree args
, int flags
,
2953 tree type
= NULL_TREE
;
2955 tree what
= NULL_TREE
;
2958 *no_add_attrs
= true;
2959 else if (TREE_CODE (TREE_VALUE (args
)) != STRING_CST
)
2961 error ("deprecated message is not a string");
2962 *no_add_attrs
= true;
2968 type
= TREE_TYPE (decl
);
2970 if (TREE_CODE (decl
) == TYPE_DECL
2971 || TREE_CODE (decl
) == PARM_DECL
2972 || VAR_OR_FUNCTION_DECL_P (decl
)
2973 || TREE_CODE (decl
) == FIELD_DECL
2974 || TREE_CODE (decl
) == CONST_DECL
2975 || objc_method_decl (TREE_CODE (decl
)))
2976 TREE_DEPRECATED (decl
) = 1;
2980 else if (TYPE_P (*node
))
2982 if (!(flags
& (int) ATTR_FLAG_TYPE_IN_PLACE
))
2983 *node
= build_variant_type_copy (*node
);
2984 TREE_DEPRECATED (*node
) = 1;
2992 *no_add_attrs
= true;
2993 if (type
&& TYPE_NAME (type
))
2995 if (TREE_CODE (TYPE_NAME (type
)) == IDENTIFIER_NODE
)
2996 what
= TYPE_NAME (*node
);
2997 else if (TREE_CODE (TYPE_NAME (type
)) == TYPE_DECL
2998 && DECL_NAME (TYPE_NAME (type
)))
2999 what
= DECL_NAME (TYPE_NAME (type
));
3002 warning (OPT_Wattributes
, "%qE attribute ignored for %qE", name
, what
);
3004 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
3010 /* Handle a "vector_size" attribute; arguments as in
3011 struct attribute_spec.handler. */
3014 handle_vector_size_attribute (tree
*node
, tree name
, tree args
,
3015 int ARG_UNUSED (flags
),
3018 unsigned HOST_WIDE_INT vecsize
, nunits
;
3019 machine_mode orig_mode
;
3020 tree type
= *node
, new_type
, size
;
3022 *no_add_attrs
= true;
3024 size
= TREE_VALUE (args
);
3025 if (size
&& TREE_CODE (size
) != IDENTIFIER_NODE
3026 && TREE_CODE (size
) != FUNCTION_DECL
)
3027 size
= default_conversion (size
);
3029 if (!tree_fits_uhwi_p (size
))
3031 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
3035 /* Get the vector size (in bytes). */
3036 vecsize
= tree_to_uhwi (size
);
3038 /* We need to provide for vector pointers, vector arrays, and
3039 functions returning vectors. For example:
3041 __attribute__((vector_size(16))) short *foo;
3043 In this case, the mode is SI, but the type being modified is
3044 HI, so we need to look further. */
3046 while (POINTER_TYPE_P (type
)
3047 || TREE_CODE (type
) == FUNCTION_TYPE
3048 || TREE_CODE (type
) == METHOD_TYPE
3049 || TREE_CODE (type
) == ARRAY_TYPE
3050 || TREE_CODE (type
) == OFFSET_TYPE
)
3051 type
= TREE_TYPE (type
);
3053 /* Get the mode of the type being modified. */
3054 orig_mode
= TYPE_MODE (type
);
3056 if ((!INTEGRAL_TYPE_P (type
)
3057 && !SCALAR_FLOAT_TYPE_P (type
)
3058 && !FIXED_POINT_TYPE_P (type
))
3059 || (!SCALAR_FLOAT_MODE_P (orig_mode
)
3060 && GET_MODE_CLASS (orig_mode
) != MODE_INT
3061 && !ALL_SCALAR_FIXED_POINT_MODE_P (orig_mode
))
3062 || !tree_fits_uhwi_p (TYPE_SIZE_UNIT (type
))
3063 || TREE_CODE (type
) == BOOLEAN_TYPE
)
3065 error ("invalid vector type for attribute %qE", name
);
3069 if (vecsize
% tree_to_uhwi (TYPE_SIZE_UNIT (type
)))
3071 error ("vector size not an integral multiple of component size");
3077 error ("zero vector size");
3081 /* Calculate how many units fit in the vector. */
3082 nunits
= vecsize
/ tree_to_uhwi (TYPE_SIZE_UNIT (type
));
3083 if (nunits
& (nunits
- 1))
3085 error ("number of components of the vector not a power of two");
3089 new_type
= build_vector_type (type
, nunits
);
3091 /* Build back pointers if needed. */
3092 *node
= lang_hooks
.types
.reconstruct_complex_type (*node
, new_type
);
3097 /* Handle the "nonnull" attribute. */
3100 handle_nonnull_attribute (tree
*node
, tree
ARG_UNUSED (name
),
3101 tree args
, int ARG_UNUSED (flags
),
3105 unsigned HOST_WIDE_INT attr_arg_num
;
3107 /* If no arguments are specified, all pointer arguments should be
3108 non-null. Verify a full prototype is given so that the arguments
3109 will have the correct types when we actually check them later.
3110 Avoid diagnosing type-generic built-ins since those have no
3114 if (!prototype_p (type
)
3115 && (!TYPE_ATTRIBUTES (type
)
3116 || !lookup_attribute ("type generic", TYPE_ATTRIBUTES (type
))))
3118 error ("nonnull attribute without arguments on a non-prototype");
3119 *no_add_attrs
= true;
3124 /* Argument list specified. Verify that each argument number references
3125 a pointer argument. */
3126 for (attr_arg_num
= 1; args
; attr_arg_num
++, args
= TREE_CHAIN (args
))
3128 unsigned HOST_WIDE_INT arg_num
= 0, ck_num
;
3130 tree arg
= TREE_VALUE (args
);
3131 if (arg
&& TREE_CODE (arg
) != IDENTIFIER_NODE
3132 && TREE_CODE (arg
) != FUNCTION_DECL
)
3133 TREE_VALUE (args
) = arg
= default_conversion (arg
);
3135 if (!get_nonnull_operand (arg
, &arg_num
))
3137 error ("nonnull argument has invalid operand number (argument %lu)",
3138 (unsigned long) attr_arg_num
);
3139 *no_add_attrs
= true;
3143 if (prototype_p (type
))
3145 function_args_iterator iter
;
3148 function_args_iter_init (&iter
, type
);
3149 for (ck_num
= 1; ; ck_num
++, function_args_iter_next (&iter
))
3151 argument
= function_args_iter_cond (&iter
);
3152 if (argument
== NULL_TREE
|| ck_num
== arg_num
)
3157 || TREE_CODE (argument
) == VOID_TYPE
)
3159 error ("nonnull argument with out-of-range operand number "
3160 "(argument %lu, operand %lu)",
3161 (unsigned long) attr_arg_num
, (unsigned long) arg_num
);
3162 *no_add_attrs
= true;
3166 if (TREE_CODE (argument
) != POINTER_TYPE
)
3168 error ("nonnull argument references non-pointer operand "
3169 "(argument %lu, operand %lu)",
3170 (unsigned long) attr_arg_num
, (unsigned long) arg_num
);
3171 *no_add_attrs
= true;
3180 /* Handle the "nonstring" variable attribute. */
3183 handle_nonstring_attribute (tree
*node
, tree name
, tree
ARG_UNUSED (args
),
3184 int ARG_UNUSED (flags
), bool *no_add_attrs
)
3187 tree_code code
= TREE_CODE (*node
);
3190 || code
== FIELD_DECL
3191 || code
== PARM_DECL
)
3193 tree type
= TREE_TYPE (*node
);
3195 if (POINTER_TYPE_P (type
) || TREE_CODE (type
) == ARRAY_TYPE
)
3197 /* Accept the attribute on arrays and pointers to all three
3198 narrow character types. */
3199 tree eltype
= TREE_TYPE (type
);
3200 eltype
= TYPE_MAIN_VARIANT (eltype
);
3201 if (eltype
== char_type_node
3202 || eltype
== signed_char_type_node
3203 || eltype
== unsigned_char_type_node
)
3207 warning (OPT_Wattributes
,
3208 "%qE attribute ignored on objects of type %qT",
3210 *no_add_attrs
= true;
3214 if (code
== FUNCTION_DECL
)
3215 warning (OPT_Wattributes
,
3216 "%qE attribute does not apply to functions", name
);
3217 else if (code
== TYPE_DECL
)
3218 warning (OPT_Wattributes
,
3219 "%qE attribute does not apply to types", name
);
3221 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
3223 *no_add_attrs
= true;
3227 /* Handle a "nothrow" attribute; arguments as in
3228 struct attribute_spec.handler. */
3231 handle_nothrow_attribute (tree
*node
, tree name
, tree
ARG_UNUSED (args
),
3232 int ARG_UNUSED (flags
), bool *no_add_attrs
)
3234 if (TREE_CODE (*node
) == FUNCTION_DECL
)
3235 TREE_NOTHROW (*node
) = 1;
3236 /* ??? TODO: Support types. */
3239 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
3240 *no_add_attrs
= true;
3246 /* Handle a "cleanup" attribute; arguments as in
3247 struct attribute_spec.handler. */
3250 handle_cleanup_attribute (tree
*node
, tree name
, tree args
,
3251 int ARG_UNUSED (flags
), bool *no_add_attrs
)
3254 tree cleanup_id
, cleanup_decl
;
3256 /* ??? Could perhaps support cleanups on TREE_STATIC, much like we do
3257 for global destructors in C++. This requires infrastructure that
3258 we don't have generically at the moment. It's also not a feature
3259 we'd be missing too much, since we do have attribute constructor. */
3260 if (!VAR_P (decl
) || TREE_STATIC (decl
))
3262 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
3263 *no_add_attrs
= true;
3267 /* Verify that the argument is a function in scope. */
3268 /* ??? We could support pointers to functions here as well, if
3269 that was considered desirable. */
3270 cleanup_id
= TREE_VALUE (args
);
3271 if (TREE_CODE (cleanup_id
) != IDENTIFIER_NODE
)
3273 error ("cleanup argument not an identifier");
3274 *no_add_attrs
= true;
3277 cleanup_decl
= lookup_name (cleanup_id
);
3278 if (!cleanup_decl
|| TREE_CODE (cleanup_decl
) != FUNCTION_DECL
)
3280 error ("cleanup argument not a function");
3281 *no_add_attrs
= true;
3285 /* That the function has proper type is checked with the
3286 eventual call to build_function_call. */
3291 /* Handle a "warn_unused_result" attribute. No special handling. */
3294 handle_warn_unused_result_attribute (tree
*node
, tree name
,
3295 tree
ARG_UNUSED (args
),
3296 int ARG_UNUSED (flags
), bool *no_add_attrs
)
3298 /* Ignore the attribute for functions not returning any value. */
3299 if (VOID_TYPE_P (TREE_TYPE (*node
)))
3301 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
3302 *no_add_attrs
= true;
3308 /* Handle a "sentinel" attribute. */
3311 handle_sentinel_attribute (tree
*node
, tree name
, tree args
,
3312 int ARG_UNUSED (flags
), bool *no_add_attrs
)
3314 if (!prototype_p (*node
))
3316 warning (OPT_Wattributes
,
3317 "%qE attribute requires prototypes with named arguments", name
);
3318 *no_add_attrs
= true;
3322 if (!stdarg_p (*node
))
3324 warning (OPT_Wattributes
,
3325 "%qE attribute only applies to variadic functions", name
);
3326 *no_add_attrs
= true;
3332 tree position
= TREE_VALUE (args
);
3333 if (position
&& TREE_CODE (position
) != IDENTIFIER_NODE
3334 && TREE_CODE (position
) != FUNCTION_DECL
)
3335 position
= default_conversion (position
);
3337 if (TREE_CODE (position
) != INTEGER_CST
3338 || !INTEGRAL_TYPE_P (TREE_TYPE (position
)))
3340 warning (OPT_Wattributes
,
3341 "requested position is not an integer constant");
3342 *no_add_attrs
= true;
3346 if (tree_int_cst_lt (position
, integer_zero_node
))
3348 warning (OPT_Wattributes
,
3349 "requested position is less than zero");
3350 *no_add_attrs
= true;
3358 /* Handle a "type_generic" attribute. */
3361 handle_type_generic_attribute (tree
*node
, tree
ARG_UNUSED (name
),
3362 tree
ARG_UNUSED (args
), int ARG_UNUSED (flags
),
3363 bool * ARG_UNUSED (no_add_attrs
))
3365 /* Ensure we have a function type. */
3366 gcc_assert (TREE_CODE (*node
) == FUNCTION_TYPE
);
3368 /* Ensure we have a variadic function. */
3369 gcc_assert (!prototype_p (*node
) || stdarg_p (*node
));
3374 /* Handle a "target" attribute. */
3377 handle_target_attribute (tree
*node
, tree name
, tree args
, int flags
,
3380 /* Ensure we have a function type. */
3381 if (TREE_CODE (*node
) != FUNCTION_DECL
)
3383 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
3384 *no_add_attrs
= true;
3386 else if (lookup_attribute ("target_clones", DECL_ATTRIBUTES (*node
)))
3388 warning (OPT_Wattributes
, "%qE attribute ignored due to conflict "
3389 "with %qs attribute", name
, "target_clones");
3390 *no_add_attrs
= true;
3392 else if (! targetm
.target_option
.valid_attribute_p (*node
, name
, args
,
3394 *no_add_attrs
= true;
3396 /* Check that there's no empty string in values of the attribute. */
3397 for (tree t
= args
; t
!= NULL_TREE
; t
= TREE_CHAIN (t
))
3399 tree value
= TREE_VALUE (t
);
3400 if (TREE_CODE (value
) == STRING_CST
3401 && TREE_STRING_LENGTH (value
) == 1
3402 && TREE_STRING_POINTER (value
)[0] == '\0')
3404 warning (OPT_Wattributes
, "empty string in attribute %<target%>");
3405 *no_add_attrs
= true;
3412 /* Handle a "target_clones" attribute. */
3415 handle_target_clones_attribute (tree
*node
, tree name
, tree
ARG_UNUSED (args
),
3416 int ARG_UNUSED (flags
), bool *no_add_attrs
)
3418 /* Ensure we have a function type. */
3419 if (TREE_CODE (*node
) == FUNCTION_DECL
)
3421 if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (*node
)))
3423 warning (OPT_Wattributes
, "%qE attribute ignored due to conflict "
3424 "with %qs attribute", name
, "always_inline");
3425 *no_add_attrs
= true;
3427 else if (lookup_attribute ("target", DECL_ATTRIBUTES (*node
)))
3429 warning (OPT_Wattributes
, "%qE attribute ignored due to conflict "
3430 "with %qs attribute", name
, "target");
3431 *no_add_attrs
= true;
3434 /* Do not inline functions with multiple clone targets. */
3435 DECL_UNINLINABLE (*node
) = 1;
3439 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
3440 *no_add_attrs
= true;
3445 /* For handling "optimize" attribute. arguments as in
3446 struct attribute_spec.handler. */
3449 handle_optimize_attribute (tree
*node
, tree name
, tree args
,
3450 int ARG_UNUSED (flags
), bool *no_add_attrs
)
3452 /* Ensure we have a function type. */
3453 if (TREE_CODE (*node
) != FUNCTION_DECL
)
3455 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
3456 *no_add_attrs
= true;
3460 struct cl_optimization cur_opts
;
3461 tree old_opts
= DECL_FUNCTION_SPECIFIC_OPTIMIZATION (*node
);
3463 /* Save current options. */
3464 cl_optimization_save (&cur_opts
, &global_options
);
3466 /* If we previously had some optimization options, use them as the
3469 cl_optimization_restore (&global_options
,
3470 TREE_OPTIMIZATION (old_opts
));
3472 /* Parse options, and update the vector. */
3473 parse_optimize_options (args
, true);
3474 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (*node
)
3475 = build_optimization_node (&global_options
);
3477 /* Restore current options. */
3478 cl_optimization_restore (&global_options
, &cur_opts
);
3484 /* Handle a "no_split_stack" attribute. */
3487 handle_no_split_stack_attribute (tree
*node
, tree name
,
3488 tree
ARG_UNUSED (args
),
3489 int ARG_UNUSED (flags
),
3494 if (TREE_CODE (decl
) != FUNCTION_DECL
)
3496 error_at (DECL_SOURCE_LOCATION (decl
),
3497 "%qE attribute applies only to functions", name
);
3498 *no_add_attrs
= true;
3500 else if (DECL_INITIAL (decl
))
3502 error_at (DECL_SOURCE_LOCATION (decl
),
3503 "can%'t set %qE attribute after definition", name
);
3504 *no_add_attrs
= true;
3510 /* Handle a "returns_nonnull" attribute; arguments as in
3511 struct attribute_spec.handler. */
3514 handle_returns_nonnull_attribute (tree
*node
, tree
, tree
, int,
3517 // Even without a prototype we still have a return type we can check.
3518 if (TREE_CODE (TREE_TYPE (*node
)) != POINTER_TYPE
)
3520 error ("returns_nonnull attribute on a function not returning a pointer");
3521 *no_add_attrs
= true;
3526 /* Handle a "designated_init" attribute; arguments as in
3527 struct attribute_spec.handler. */
3530 handle_designated_init_attribute (tree
*node
, tree name
, tree
, int,
3533 if (TREE_CODE (*node
) != RECORD_TYPE
)
3535 error ("%qE attribute is only valid on %<struct%> type", name
);
3536 *no_add_attrs
= true;
3542 /* Handle a "fallthrough" attribute; arguments as in struct
3543 attribute_spec.handler. */
3546 handle_fallthrough_attribute (tree
*, tree name
, tree
, int,
3549 warning (OPT_Wattributes
, "%qE attribute ignored", name
);
3550 *no_add_attrs
= true;
3555 handle_patchable_function_entry_attribute (tree
*, tree
, tree
, int, bool *)
3557 /* Nothing to be done here. */