1 /* Handle #pragma, system V.4 style. Supports #pragma weak and #pragma pack.
2 Copyright (C) 1992-2022 Free Software Foundation, Inc.
3
4 This file is part of GCC.
5
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
9 version.
10
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
14 for more details.
15
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/>. */
19
20 #include "config.h"
21 #include "system.h"
22 #include "coretypes.h"
23 #include "target.h"
24 #include "function.h" /* For cfun. */
25 #include "c-common.h"
26 #include "memmodel.h"
27 #include "tm_p.h" /* For REGISTER_TARGET_PRAGMAS. */
28 #include "stringpool.h"
29 #include "cgraph.h"
30 #include "diagnostic.h"
31 #include "attribs.h"
32 #include "varasm.h"
33 #include "c-pragma.h"
34 #include "opts.h"
35 #include "plugin.h"
36 #include "opt-suggestions.h"
37
38 #define GCC_BAD(gmsgid) \
39 do { warning (OPT_Wpragmas, gmsgid); return; } while (0)
40 #define GCC_BAD2(gmsgid, arg) \
41 do { warning (OPT_Wpragmas, gmsgid, arg); return; } while (0)
42 #define GCC_BAD_AT(loc, gmsgid) \
43 do { warning_at (loc, OPT_Wpragmas, gmsgid); return; } while (0)
44 #define GCC_BAD2_AT(loc, gmsgid, arg) \
45 do { warning_at (loc, OPT_Wpragmas, gmsgid, arg); return; } while (0)
46
47 struct GTY(()) align_stack {
48 int alignment;
49 tree id;
50 struct align_stack * prev;
51 };
52
53 static GTY(()) struct align_stack * alignment_stack;
54
55 static void handle_pragma_pack (cpp_reader *);
56
57 /* If we have a "global" #pragma pack(<n>) in effect when the first
58 #pragma pack(push,<n>) is encountered, this stores the value of
59 maximum_field_alignment in effect. When the final pop_alignment()
60 happens, we restore the value to this, not to a value of 0 for
61 maximum_field_alignment. Value is in bits. */
62 static int default_alignment;
63 #define SET_GLOBAL_ALIGNMENT(ALIGN) (maximum_field_alignment = *(alignment_stack == NULL \
64 ? &default_alignment \
65 : &alignment_stack->alignment) = (ALIGN))
66
67 static void push_alignment (int, tree);
68 static void pop_alignment (tree);
69
70 /* Push an alignment value onto the stack. */
71 static void
push_alignment(int alignment,tree id)72 push_alignment (int alignment, tree id)
73 {
74 align_stack * entry = ggc_alloc<align_stack> ();
75
76 entry->alignment = alignment;
77 entry->id = id;
78 entry->prev = alignment_stack;
79
80 /* The current value of maximum_field_alignment is not necessarily
81 0 since there may be a #pragma pack(<n>) in effect; remember it
82 so that we can restore it after the final #pragma pop(). */
83 if (alignment_stack == NULL)
84 default_alignment = maximum_field_alignment;
85
86 alignment_stack = entry;
87
88 maximum_field_alignment = alignment;
89 }
90
91 /* Undo a push of an alignment onto the stack. */
92 static void
pop_alignment(tree id)93 pop_alignment (tree id)
94 {
95 align_stack * entry;
96
97 if (alignment_stack == NULL)
98 GCC_BAD ("%<#pragma pack (pop)%> encountered without matching "
99 "%<#pragma pack (push)%>");
100
101 /* If we got an identifier, strip away everything above the target
102 entry so that the next step will restore the state just below it. */
103 if (id)
104 {
105 for (entry = alignment_stack; entry; entry = entry->prev)
106 if (entry->id == id)
107 {
108 alignment_stack = entry;
109 break;
110 }
111 if (entry == NULL)
112 warning (OPT_Wpragmas,
113 "%<#pragma pack(pop, %E)%> encountered without matching "
114 "%<#pragma pack(push, %E)%>"
115 , id, id);
116 }
117
118 entry = alignment_stack->prev;
119
120 maximum_field_alignment = entry ? entry->alignment : default_alignment;
121
122 alignment_stack = entry;
123 }
124
125 /* #pragma pack ()
126 #pragma pack (N)
127
128 #pragma pack (push)
129 #pragma pack (push, N)
130 #pragma pack (push, ID)
131 #pragma pack (push, ID, N)
132 #pragma pack (pop)
133 #pragma pack (pop, ID) */
134 static void
handle_pragma_pack(cpp_reader *)135 handle_pragma_pack (cpp_reader *)
136 {
137 location_t loc;
138 tree x, id = 0;
139 int align = -1;
140 enum cpp_ttype token;
141 enum { set, push, pop } action;
142
143 if (pragma_lex (&x) != CPP_OPEN_PAREN)
144 GCC_BAD ("missing %<(%> after %<#pragma pack%> - ignored");
145
146 token = pragma_lex (&x, &loc);
147 if (token == CPP_CLOSE_PAREN)
148 {
149 action = set;
150 align = initial_max_fld_align;
151 }
152 else if (token == CPP_NUMBER)
153 {
154 if (TREE_CODE (x) != INTEGER_CST)
155 GCC_BAD_AT (loc, "invalid constant in %<#pragma pack%> - ignored");
156 align = TREE_INT_CST_LOW (x);
157 action = set;
158 if (pragma_lex (&x) != CPP_CLOSE_PAREN)
159 GCC_BAD ("malformed %<#pragma pack%> - ignored");
160 }
161 else if (token == CPP_NAME)
162 {
163 #define GCC_BAD_ACTION do { if (action != pop) \
164 GCC_BAD ("malformed %<#pragma pack(push[, id][, <n>])%> - ignored"); \
165 else \
166 GCC_BAD ("malformed %<#pragma pack(pop[, id])%> - ignored"); \
167 } while (0)
168
169 const char *op = IDENTIFIER_POINTER (x);
170 if (!strcmp (op, "push"))
171 action = push;
172 else if (!strcmp (op, "pop"))
173 action = pop;
174 else
175 GCC_BAD2_AT (loc, "unknown action %qE for %<#pragma pack%> - ignored",
176 x);
177
178 while ((token = pragma_lex (&x)) == CPP_COMMA)
179 {
180 token = pragma_lex (&x, &loc);
181 if (token == CPP_NAME && id == 0)
182 {
183 id = x;
184 }
185 else if (token == CPP_NUMBER && action == push && align == -1)
186 {
187 if (TREE_CODE (x) != INTEGER_CST)
188 GCC_BAD_AT (loc,
189 "invalid constant in %<#pragma pack%> - ignored");
190 align = TREE_INT_CST_LOW (x);
191 if (align == -1)
192 action = set;
193 }
194 else
195 GCC_BAD_ACTION;
196 }
197
198 if (token != CPP_CLOSE_PAREN)
199 GCC_BAD_ACTION;
200 #undef GCC_BAD_ACTION
201 }
202 else
203 GCC_BAD ("malformed %<#pragma pack%> - ignored");
204
205 if (pragma_lex (&x, &loc) != CPP_EOF)
206 warning_at (loc, OPT_Wpragmas, "junk at end of %<#pragma pack%>");
207
208 if (flag_pack_struct)
209 GCC_BAD ("%<#pragma pack%> has no effect with %<-fpack-struct%> - ignored");
210
211 if (action != pop)
212 switch (align)
213 {
214 case 0:
215 case 1:
216 case 2:
217 case 4:
218 case 8:
219 case 16:
220 align *= BITS_PER_UNIT;
221 break;
222 case -1:
223 if (action == push)
224 {
225 align = maximum_field_alignment;
226 break;
227 }
228 /* FALLTHRU */
229 default:
230 GCC_BAD2 ("alignment must be a small power of two, not %d", align);
231 }
232
233 switch (action)
234 {
235 case set: SET_GLOBAL_ALIGNMENT (align); break;
236 case push: push_alignment (align, id); break;
237 case pop: pop_alignment (id); break;
238 }
239 }
240
241 struct GTY(()) pending_weak
242 {
243 tree name;
244 tree value;
245 };
246
247
248 static GTY(()) vec<pending_weak, va_gc> *pending_weaks;
249
250 static void apply_pragma_weak (tree, tree);
251 static void handle_pragma_weak (cpp_reader *);
252
253 static void
apply_pragma_weak(tree decl,tree value)254 apply_pragma_weak (tree decl, tree value)
255 {
256 if (value)
257 {
258 value = build_string (IDENTIFIER_LENGTH (value),
259 IDENTIFIER_POINTER (value));
260 decl_attributes (&decl, build_tree_list (get_identifier ("alias"),
261 build_tree_list (NULL, value)),
262 0);
263 }
264
265 if (SUPPORTS_WEAK && DECL_EXTERNAL (decl) && TREE_USED (decl)
266 && !DECL_WEAK (decl) /* Don't complain about a redundant #pragma. */
267 && DECL_ASSEMBLER_NAME_SET_P (decl)
268 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
269 warning (OPT_Wpragmas, "applying %<#pragma weak %+D%> after first use "
270 "results in unspecified behavior", decl);
271
272 declare_weak (decl);
273 }
274
275 void
maybe_apply_pragma_weak(tree decl)276 maybe_apply_pragma_weak (tree decl)
277 {
278 tree id;
279 int i;
280 pending_weak *pe;
281
282 /* Avoid asking for DECL_ASSEMBLER_NAME when it's not needed. */
283
284 /* No weak symbols pending, take the short-cut. */
285 if (vec_safe_is_empty (pending_weaks))
286 return;
287 /* If it's not visible outside this file, it doesn't matter whether
288 it's weak. */
289 if (!DECL_EXTERNAL (decl) && !TREE_PUBLIC (decl))
290 return;
291 /* If it's not a function or a variable, it can't be weak.
292 FIXME: what kinds of things are visible outside this file but
293 aren't functions or variables? Should this be an assert instead? */
294 if (!VAR_OR_FUNCTION_DECL_P (decl))
295 return;
296
297 if (DECL_ASSEMBLER_NAME_SET_P (decl))
298 id = DECL_ASSEMBLER_NAME (decl);
299 else
300 {
301 id = DECL_ASSEMBLER_NAME (decl);
302 SET_DECL_ASSEMBLER_NAME (decl, NULL_TREE);
303 }
304
305 FOR_EACH_VEC_ELT (*pending_weaks, i, pe)
306 if (id == pe->name)
307 {
308 apply_pragma_weak (decl, pe->value);
309 pending_weaks->unordered_remove (i);
310 break;
311 }
312 }
313
314 /* Process all "#pragma weak A = B" directives where we have not seen
315 a decl for A. */
316 void
maybe_apply_pending_pragma_weaks(void)317 maybe_apply_pending_pragma_weaks (void)
318 {
319 tree alias_id, id, decl;
320 int i;
321 pending_weak *pe;
322 symtab_node *target;
323
324 if (vec_safe_is_empty (pending_weaks))
325 return;
326
327 FOR_EACH_VEC_ELT (*pending_weaks, i, pe)
328 {
329 alias_id = pe->name;
330 id = pe->value;
331
332 if (id == NULL)
333 continue;
334
335 target = symtab_node::get_for_asmname (id);
336 decl = build_decl (UNKNOWN_LOCATION,
337 target ? TREE_CODE (target->decl) : FUNCTION_DECL,
338 alias_id, default_function_type);
339
340 DECL_ARTIFICIAL (decl) = 1;
341 TREE_PUBLIC (decl) = 1;
342 DECL_WEAK (decl) = 1;
343 if (VAR_P (decl))
344 TREE_STATIC (decl) = 1;
345 if (!target)
346 {
347 error ("%q+D aliased to undefined symbol %qE",
348 decl, id);
349 continue;
350 }
351
352 assemble_alias (decl, id);
353 }
354 }
355
356 /* #pragma weak name [= value] */
357 static void
handle_pragma_weak(cpp_reader *)358 handle_pragma_weak (cpp_reader *)
359 {
360 tree name, value, x, decl;
361 enum cpp_ttype t;
362
363 value = 0;
364
365 if (pragma_lex (&name) != CPP_NAME)
366 GCC_BAD ("malformed %<#pragma weak%>, ignored");
367 t = pragma_lex (&x);
368 if (t == CPP_EQ)
369 {
370 if (pragma_lex (&value) != CPP_NAME)
371 GCC_BAD ("malformed %<#pragma weak%>, ignored");
372 t = pragma_lex (&x);
373 }
374 if (t != CPP_EOF)
375 warning (OPT_Wpragmas, "junk at end of %<#pragma weak%>");
376
377 decl = identifier_global_value (name);
378 if (decl && DECL_P (decl))
379 {
380 if (!VAR_OR_FUNCTION_DECL_P (decl))
381 GCC_BAD2 ("%<#pragma weak%> declaration of %q+D not allowed,"
382 " ignored", decl);
383 apply_pragma_weak (decl, value);
384 if (value)
385 {
386 DECL_EXTERNAL (decl) = 0;
387 if (VAR_P (decl))
388 TREE_STATIC (decl) = 1;
389 assemble_alias (decl, value);
390 }
391 }
392 else
393 {
394 pending_weak pe = {name, value};
395 vec_safe_push (pending_weaks, pe);
396 }
397 }
398
399 static enum scalar_storage_order_kind global_sso;
400
401 void
maybe_apply_pragma_scalar_storage_order(tree type)402 maybe_apply_pragma_scalar_storage_order (tree type)
403 {
404 if (global_sso == SSO_NATIVE)
405 return;
406
407 gcc_assert (RECORD_OR_UNION_TYPE_P (type));
408
409 if (lookup_attribute ("scalar_storage_order", TYPE_ATTRIBUTES (type)))
410 return;
411
412 if (global_sso == SSO_BIG_ENDIAN)
413 TYPE_REVERSE_STORAGE_ORDER (type) = !BYTES_BIG_ENDIAN;
414 else if (global_sso == SSO_LITTLE_ENDIAN)
415 TYPE_REVERSE_STORAGE_ORDER (type) = BYTES_BIG_ENDIAN;
416 else
417 gcc_unreachable ();
418 }
419
420 static void
handle_pragma_scalar_storage_order(cpp_reader *)421 handle_pragma_scalar_storage_order (cpp_reader *)
422 {
423 const char *kind_string;
424 enum cpp_ttype token;
425 tree x;
426
427 if (BYTES_BIG_ENDIAN != WORDS_BIG_ENDIAN)
428 {
429 error ("%<scalar_storage_order%> is not supported because endianness "
430 "is not uniform");
431 return;
432 }
433
434 if (c_dialect_cxx ())
435 {
436 if (warn_unknown_pragmas > in_system_header_at (input_location))
437 warning (OPT_Wunknown_pragmas,
438 "%<#pragma scalar_storage_order%> is not supported for C++");
439 return;
440 }
441
442 token = pragma_lex (&x);
443 if (token != CPP_NAME)
444 GCC_BAD ("missing %<big-endian%>, %<little-endian%>, or %<default%> after "
445 "%<#pragma scalar_storage_order%>");
446 kind_string = IDENTIFIER_POINTER (x);
447 if (strcmp (kind_string, "default") == 0)
448 global_sso = default_sso;
449 else if (strcmp (kind_string, "big") == 0)
450 global_sso = SSO_BIG_ENDIAN;
451 else if (strcmp (kind_string, "little") == 0)
452 global_sso = SSO_LITTLE_ENDIAN;
453 else
454 GCC_BAD ("expected %<big-endian%>, %<little-endian%>, or %<default%> after "
455 "%<#pragma scalar_storage_order%>");
456 }
457
458 /* GCC supports two #pragma directives for renaming the external
459 symbol associated with a declaration (DECL_ASSEMBLER_NAME), for
460 compatibility with the Solaris and VMS system headers. GCC also
461 has its own notation for this, __asm__("name") annotations.
462
463 Corner cases of these features and their interaction:
464
465 1) Both pragmas silently apply only to declarations with external
466 linkage (that is, TREE_PUBLIC || DECL_EXTERNAL). Asm labels
467 do not have this restriction.
468
469 2) In C++, both #pragmas silently apply only to extern "C" declarations.
470 Asm labels do not have this restriction.
471
472 3) If any of the three ways of changing DECL_ASSEMBLER_NAME is
473 applied to a decl whose DECL_ASSEMBLER_NAME is already set, and the
474 new name is different, a warning issues and the name does not change.
475
476 4) The "source name" for #pragma redefine_extname is the DECL_NAME,
477 *not* the DECL_ASSEMBLER_NAME.
478
479 5) If #pragma extern_prefix is in effect and a declaration occurs
480 with an __asm__ name, the #pragma extern_prefix is silently
481 ignored for that declaration.
482
483 6) If #pragma extern_prefix and #pragma redefine_extname apply to
484 the same declaration, whichever triggered first wins, and a warning
485 is issued. (We would like to have #pragma redefine_extname always
486 win, but it can appear either before or after the declaration, and
487 if it appears afterward, we have no way of knowing whether a modified
488 DECL_ASSEMBLER_NAME is due to #pragma extern_prefix.) */
489
490 struct GTY(()) pending_redefinition {
491 tree oldname;
492 tree newname;
493 };
494
495
496 static GTY(()) vec<pending_redefinition, va_gc> *pending_redefine_extname;
497
498 static void handle_pragma_redefine_extname (cpp_reader *);
499
500 /* #pragma redefine_extname oldname newname */
501 static void
handle_pragma_redefine_extname(cpp_reader *)502 handle_pragma_redefine_extname (cpp_reader *)
503 {
504 tree oldname, newname, decls, x;
505 enum cpp_ttype t;
506 bool found;
507
508 if (pragma_lex (&oldname) != CPP_NAME)
509 GCC_BAD ("malformed %<#pragma redefine_extname%>, ignored");
510 if (pragma_lex (&newname) != CPP_NAME)
511 GCC_BAD ("malformed %<#pragma redefine_extname%>, ignored");
512 t = pragma_lex (&x);
513 if (t != CPP_EOF)
514 warning (OPT_Wpragmas, "junk at end of %<#pragma redefine_extname%>");
515
516 found = false;
517 for (decls = c_linkage_bindings (oldname);
518 decls; )
519 {
520 tree decl;
521 if (TREE_CODE (decls) == TREE_LIST)
522 {
523 decl = TREE_VALUE (decls);
524 decls = TREE_CHAIN (decls);
525 }
526 else
527 {
528 decl = decls;
529 decls = NULL_TREE;
530 }
531
532 if ((TREE_PUBLIC (decl) || DECL_EXTERNAL (decl))
533 && VAR_OR_FUNCTION_DECL_P (decl))
534 {
535 found = true;
536 if (DECL_ASSEMBLER_NAME_SET_P (decl))
537 {
538 const char *name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
539 name = targetm.strip_name_encoding (name);
540
541 if (!id_equal (newname, name))
542 warning (OPT_Wpragmas, "%<#pragma redefine_extname%> "
543 "ignored due to conflict with previous rename");
544 }
545 else
546 symtab->change_decl_assembler_name (decl, newname);
547 }
548 }
549
550 if (!found)
551 /* We have to add this to the rename list even if there's already
552 a global value that doesn't meet the above criteria, because in
553 C++ "struct foo {...};" puts "foo" in the current namespace but
554 does *not* conflict with a subsequent declaration of a function
555 or variable foo. See g++.dg/other/pragma-re-2.C. */
556 add_to_renaming_pragma_list (oldname, newname);
557 }
558
559 /* This is called from here and from ia64-c.cc. */
560 void
add_to_renaming_pragma_list(tree oldname,tree newname)561 add_to_renaming_pragma_list (tree oldname, tree newname)
562 {
563 unsigned ix;
564 pending_redefinition *p;
565
566 FOR_EACH_VEC_SAFE_ELT (pending_redefine_extname, ix, p)
567 if (oldname == p->oldname)
568 {
569 if (p->newname != newname)
570 warning (OPT_Wpragmas, "%<#pragma redefine_extname%> ignored due to "
571 "conflict with previous %<#pragma redefine_extname%>");
572 return;
573 }
574
575 pending_redefinition e = {oldname, newname};
576 vec_safe_push (pending_redefine_extname, e);
577 }
578
579 /* The current prefix set by #pragma extern_prefix. */
580 GTY(()) tree pragma_extern_prefix;
581
582 /* Hook from the front ends to apply the results of one of the preceding
583 pragmas that rename variables. */
584
585 tree
maybe_apply_renaming_pragma(tree decl,tree asmname)586 maybe_apply_renaming_pragma (tree decl, tree asmname)
587 {
588 unsigned ix;
589 pending_redefinition *p;
590
591 /* The renaming pragmas are only applied to declarations with
592 external linkage. */
593 if (!VAR_OR_FUNCTION_DECL_P (decl)
594 || (!TREE_PUBLIC (decl) && !DECL_EXTERNAL (decl))
595 || !has_c_linkage (decl))
596 return asmname;
597
598 /* If the DECL_ASSEMBLER_NAME is already set, it does not change,
599 but we may warn about a rename that conflicts. */
600 if (DECL_ASSEMBLER_NAME_SET_P (decl))
601 {
602 const char *oldname = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
603 oldname = targetm.strip_name_encoding (oldname);
604
605 if (asmname && strcmp (TREE_STRING_POINTER (asmname), oldname))
606 warning (OPT_Wpragmas, "%<asm%> declaration ignored due to "
607 "conflict with previous rename");
608
609 /* Take any pending redefine_extname off the list. */
610 FOR_EACH_VEC_SAFE_ELT (pending_redefine_extname, ix, p)
611 if (DECL_NAME (decl) == p->oldname)
612 {
613 /* Only warn if there is a conflict. */
614 if (!id_equal (p->newname, oldname))
615 warning (OPT_Wpragmas, "%<#pragma redefine_extname%> ignored "
616 "due to conflict with previous rename");
617
618 pending_redefine_extname->unordered_remove (ix);
619 break;
620 }
621 return NULL_TREE;
622 }
623
624 /* Find out if we have a pending #pragma redefine_extname. */
625 FOR_EACH_VEC_SAFE_ELT (pending_redefine_extname, ix, p)
626 if (DECL_NAME (decl) == p->oldname)
627 {
628 tree newname = p->newname;
629 pending_redefine_extname->unordered_remove (ix);
630
631 /* If we already have an asmname, #pragma redefine_extname is
632 ignored (with a warning if it conflicts). */
633 if (asmname)
634 {
635 if (strcmp (TREE_STRING_POINTER (asmname),
636 IDENTIFIER_POINTER (newname)) != 0)
637 warning (OPT_Wpragmas, "%<#pragma redefine_extname%> ignored "
638 "due to conflict with %<asm%> declaration");
639 return asmname;
640 }
641
642 /* Otherwise we use what we've got; #pragma extern_prefix is
643 silently ignored. */
644 return build_string (IDENTIFIER_LENGTH (newname),
645 IDENTIFIER_POINTER (newname));
646 }
647
648 /* If we've got an asmname, #pragma extern_prefix is silently ignored. */
649 if (asmname)
650 return asmname;
651
652 /* If #pragma extern_prefix is in effect, apply it. */
653 if (pragma_extern_prefix)
654 {
655 const char *prefix = TREE_STRING_POINTER (pragma_extern_prefix);
656 size_t plen = TREE_STRING_LENGTH (pragma_extern_prefix) - 1;
657
658 const char *id = IDENTIFIER_POINTER (DECL_NAME (decl));
659 size_t ilen = IDENTIFIER_LENGTH (DECL_NAME (decl));
660
661 char *newname = (char *) alloca (plen + ilen + 1);
662
663 memcpy (newname, prefix, plen);
664 memcpy (newname + plen, id, ilen + 1);
665
666 return build_string (plen + ilen, newname);
667 }
668
669 /* Nada. */
670 return NULL_TREE;
671 }
672
673
674 static void handle_pragma_visibility (cpp_reader *);
675
676 static vec<int> visstack;
677
678 /* Push the visibility indicated by STR onto the top of the #pragma
679 visibility stack. KIND is 0 for #pragma GCC visibility, 1 for
680 C++ namespace with visibility attribute and 2 for C++ builtin
681 ABI namespace. push_visibility/pop_visibility calls must have
682 matching KIND, it is not allowed to push visibility using one
683 KIND and pop using a different one. */
684
685 void
push_visibility(const char * str,int kind)686 push_visibility (const char *str, int kind)
687 {
688 visstack.safe_push (((int) default_visibility) | (kind << 8));
689 if (!strcmp (str, "default"))
690 default_visibility = VISIBILITY_DEFAULT;
691 else if (!strcmp (str, "internal"))
692 default_visibility = VISIBILITY_INTERNAL;
693 else if (!strcmp (str, "hidden"))
694 default_visibility = VISIBILITY_HIDDEN;
695 else if (!strcmp (str, "protected"))
696 default_visibility = VISIBILITY_PROTECTED;
697 else
698 GCC_BAD ("%<#pragma GCC visibility push()%> must specify %<default%>, "
699 "%<internal%>, %<hidden%> or %<protected%>");
700 visibility_options.inpragma = 1;
701 }
702
703 /* Pop a level of the #pragma visibility stack. Return true if
704 successful. */
705
706 bool
pop_visibility(int kind)707 pop_visibility (int kind)
708 {
709 if (!visstack.length ())
710 return false;
711 if ((visstack.last () >> 8) != kind)
712 return false;
713 default_visibility
714 = (enum symbol_visibility) (visstack.pop () & 0xff);
715 visibility_options.inpragma
716 = visstack.length () != 0;
717 return true;
718 }
719
720 /* Sets the default visibility for symbols to something other than that
721 specified on the command line. */
722
723 static void
handle_pragma_visibility(cpp_reader *)724 handle_pragma_visibility (cpp_reader *)
725 {
726 /* Form is #pragma GCC visibility push(hidden)|pop */
727 tree x;
728 enum cpp_ttype token;
729 enum { bad, push, pop } action = bad;
730
731 token = pragma_lex (&x);
732 if (token == CPP_NAME)
733 {
734 const char *op = IDENTIFIER_POINTER (x);
735 if (!strcmp (op, "push"))
736 action = push;
737 else if (!strcmp (op, "pop"))
738 action = pop;
739 }
740 if (bad == action)
741 GCC_BAD ("%<#pragma GCC visibility%> must be followed by %<push%> "
742 "or %<pop%>");
743 else
744 {
745 if (pop == action)
746 {
747 if (! pop_visibility (0))
748 GCC_BAD ("no matching push for %<#pragma GCC visibility pop%>");
749 }
750 else
751 {
752 if (pragma_lex (&x) != CPP_OPEN_PAREN)
753 GCC_BAD ("missing %<(%> after %<#pragma GCC visibility push%> - ignored");
754 token = pragma_lex (&x);
755 if (token != CPP_NAME)
756 GCC_BAD ("malformed %<#pragma GCC visibility push%>");
757 else
758 push_visibility (IDENTIFIER_POINTER (x), 0);
759 if (pragma_lex (&x) != CPP_CLOSE_PAREN)
760 GCC_BAD ("missing %<(%> after %<#pragma GCC visibility push%> - ignored");
761 }
762 }
763 if (pragma_lex (&x) != CPP_EOF)
764 warning (OPT_Wpragmas, "junk at end of %<#pragma GCC visibility%>");
765 }
766
767 static void
handle_pragma_diagnostic(cpp_reader *)768 handle_pragma_diagnostic(cpp_reader *)
769 {
770 tree x;
771 location_t loc;
772 enum cpp_ttype token = pragma_lex (&x, &loc);
773 if (token != CPP_NAME)
774 {
775 warning_at (loc, OPT_Wpragmas,
776 "missing %<error%>, %<warning%>, %<ignored%>, %<push%>, "
777 "%<pop%>, or %<ignored_attributes%> after "
778 "%<#pragma GCC diagnostic%>");
779 return;
780 }
781
782 diagnostic_t kind;
783 const char *kind_string = IDENTIFIER_POINTER (x);
784 if (strcmp (kind_string, "error") == 0)
785 kind = DK_ERROR;
786 else if (strcmp (kind_string, "warning") == 0)
787 kind = DK_WARNING;
788 else if (strcmp (kind_string, "ignored") == 0)
789 kind = DK_IGNORED;
790 else if (strcmp (kind_string, "push") == 0)
791 {
792 diagnostic_push_diagnostics (global_dc, input_location);
793 return;
794 }
795 else if (strcmp (kind_string, "pop") == 0)
796 {
797 diagnostic_pop_diagnostics (global_dc, input_location);
798 return;
799 }
800 else if (strcmp (kind_string, "ignored_attributes") == 0)
801 {
802 token = pragma_lex (&x, &loc);
803 if (token != CPP_STRING)
804 {
805 warning_at (loc, OPT_Wpragmas,
806 "missing attribute name after %<#pragma GCC diagnostic "
807 "ignored_attributes%>");
808 return;
809 }
810 char *args = xstrdup (TREE_STRING_POINTER (x));
811 const size_t l = strlen (args);
812 if (l == 0)
813 {
814 warning_at (loc, OPT_Wpragmas, "missing argument to %<#pragma GCC "
815 "diagnostic ignored_attributes%>");
816 free (args);
817 return;
818 }
819 else if (args[l - 1] == ',')
820 {
821 warning_at (loc, OPT_Wpragmas, "trailing %<,%> in arguments for "
822 "%<#pragma GCC diagnostic ignored_attributes%>");
823 free (args);
824 return;
825 }
826 auto_vec<char *> v;
827 for (char *p = strtok (args, ","); p; p = strtok (NULL, ","))
828 v.safe_push (p);
829 handle_ignored_attributes_option (&v);
830 free (args);
831 return;
832 }
833 else
834 {
835 warning_at (loc, OPT_Wpragmas,
836 "expected %<error%>, %<warning%>, %<ignored%>, %<push%>, "
837 "%<pop%>, %<ignored_attributes%> after "
838 "%<#pragma GCC diagnostic%>");
839 return;
840 }
841
842 token = pragma_lex (&x, &loc);
843 if (token != CPP_STRING)
844 {
845 warning_at (loc, OPT_Wpragmas,
846 "missing option after %<#pragma GCC diagnostic%> kind");
847 return;
848 }
849
850 const char *option_string = TREE_STRING_POINTER (x);
851 unsigned int lang_mask = c_common_option_lang_mask () | CL_COMMON;
852 /* option_string + 1 to skip the initial '-' */
853 unsigned int option_index = find_opt (option_string + 1, lang_mask);
854 if (option_index == OPT_SPECIAL_unknown)
855 {
856 auto_diagnostic_group d;
857 if (warning_at (loc, OPT_Wpragmas,
858 "unknown option after %<#pragma GCC diagnostic%> kind"))
859 {
860 option_proposer op;
861 const char *hint = op.suggest_option (option_string + 1);
862 if (hint)
863 inform (loc, "did you mean %<-%s%>?", hint);
864 }
865 return;
866 }
867 else if (!(cl_options[option_index].flags & CL_WARNING))
868 {
869 warning_at (loc, OPT_Wpragmas,
870 "%qs is not an option that controls warnings", option_string);
871 return;
872 }
873 else if (!(cl_options[option_index].flags & lang_mask))
874 {
875 char *ok_langs = write_langs (cl_options[option_index].flags);
876 char *bad_lang = write_langs (c_common_option_lang_mask ());
877 warning_at (loc, OPT_Wpragmas,
878 "option %qs is valid for %s but not for %s",
879 option_string, ok_langs, bad_lang);
880 free (ok_langs);
881 free (bad_lang);
882 return;
883 }
884
885 struct cl_option_handlers handlers;
886 set_default_handlers (&handlers, NULL);
887 const char *arg = NULL;
888 if (cl_options[option_index].flags & CL_JOINED)
889 arg = option_string + 1 + cl_options[option_index].opt_len;
890 /* FIXME: input_location isn't the best location here, but it is
891 what we used to do here before and changing it breaks e.g.
892 PR69543 and PR69558. */
893 control_warning_option (option_index, (int) kind,
894 arg, kind != DK_IGNORED,
895 input_location, lang_mask, &handlers,
896 &global_options, &global_options_set,
897 global_dc);
898 }
899
900 /* Parse #pragma GCC target (xxx) to set target specific options. */
901 static void
handle_pragma_target(cpp_reader *)902 handle_pragma_target(cpp_reader *)
903 {
904 location_t loc;
905 enum cpp_ttype token;
906 tree x;
907 bool close_paren_needed_p = false;
908
909 if (cfun)
910 {
911 error ("%<#pragma GCC option%> is not allowed inside functions");
912 return;
913 }
914
915 token = pragma_lex (&x, &loc);
916 if (token == CPP_OPEN_PAREN)
917 {
918 close_paren_needed_p = true;
919 token = pragma_lex (&x, &loc);
920 }
921
922 if (token != CPP_STRING)
923 GCC_BAD_AT (loc, "%<#pragma GCC option%> is not a string");
924
925 /* Strings are user options. */
926 else
927 {
928 tree args = NULL_TREE;
929
930 do
931 {
932 /* Build up the strings now as a tree linked list. Skip empty
933 strings. */
934 if (TREE_STRING_LENGTH (x) > 0)
935 args = tree_cons (NULL_TREE, x, args);
936
937 token = pragma_lex (&x);
938 while (token == CPP_COMMA)
939 token = pragma_lex (&x);
940 }
941 while (token == CPP_STRING);
942
943 if (close_paren_needed_p)
944 {
945 if (token == CPP_CLOSE_PAREN)
946 token = pragma_lex (&x);
947 else
948 GCC_BAD ("%<#pragma GCC target (string [,string]...)%> does "
949 "not have a final %<)%>");
950 }
951
952 if (token != CPP_EOF)
953 {
954 error ("%<#pragma GCC target%> string is badly formed");
955 return;
956 }
957
958 /* put arguments in the order the user typed them. */
959 args = nreverse (args);
960
961 if (targetm.target_option.pragma_parse (args, NULL_TREE))
962 current_target_pragma = chainon (current_target_pragma, args);
963
964 /* A target pragma can also influence optimization options. */
965 tree current_optimize
966 = build_optimization_node (&global_options, &global_options_set);
967 if (current_optimize != optimization_current_node)
968 optimization_current_node = current_optimize;
969 }
970 }
971
972 /* Handle #pragma GCC optimize to set optimization options. */
973 static void
handle_pragma_optimize(cpp_reader *)974 handle_pragma_optimize (cpp_reader *)
975 {
976 enum cpp_ttype token;
977 tree x;
978 bool close_paren_needed_p = false;
979 tree optimization_previous_node = optimization_current_node;
980
981 if (cfun)
982 {
983 error ("%<#pragma GCC optimize%> is not allowed inside functions");
984 return;
985 }
986
987 token = pragma_lex (&x);
988 if (token == CPP_OPEN_PAREN)
989 {
990 close_paren_needed_p = true;
991 token = pragma_lex (&x);
992 }
993
994 if (token != CPP_STRING && token != CPP_NUMBER)
995 GCC_BAD ("%<#pragma GCC optimize%> is not a string or number");
996
997 /* Strings/numbers are user options. */
998 else
999 {
1000 tree args = NULL_TREE;
1001
1002 do
1003 {
1004 /* Build up the numbers/strings now as a list. */
1005 if (token != CPP_STRING || TREE_STRING_LENGTH (x) > 0)
1006 args = tree_cons (NULL_TREE, x, args);
1007
1008 token = pragma_lex (&x);
1009 while (token == CPP_COMMA)
1010 token = pragma_lex (&x);
1011 }
1012 while (token == CPP_STRING || token == CPP_NUMBER);
1013
1014 if (close_paren_needed_p)
1015 {
1016 if (token == CPP_CLOSE_PAREN)
1017 token = pragma_lex (&x);
1018 else
1019 GCC_BAD ("%<#pragma GCC optimize (string [,string]...)%> does "
1020 "not have a final %<)%>");
1021 }
1022
1023 if (token != CPP_EOF)
1024 {
1025 error ("%<#pragma GCC optimize%> string is badly formed");
1026 return;
1027 }
1028
1029 /* put arguments in the order the user typed them. */
1030 args = nreverse (args);
1031
1032 parse_optimize_options (args, false);
1033 current_optimize_pragma = chainon (current_optimize_pragma, args);
1034 optimization_current_node
1035 = build_optimization_node (&global_options, &global_options_set);
1036 c_cpp_builtins_optimize_pragma (parse_in,
1037 optimization_previous_node,
1038 optimization_current_node);
1039 }
1040 }
1041
1042 /* Stack of the #pragma GCC options created with #pragma GCC push_option. Save
1043 both the binary representation of the options and the TREE_LIST of
1044 strings that will be added to the function's attribute list. */
1045 struct GTY(()) opt_stack {
1046 struct opt_stack *prev;
1047 tree target_binary;
1048 tree target_strings;
1049 tree optimize_binary;
1050 tree optimize_strings;
1051 gcc_options * GTY ((skip)) saved_global_options;
1052 };
1053
1054 static GTY(()) struct opt_stack * options_stack;
1055
1056 /* Handle #pragma GCC push_options to save the current target and optimization
1057 options. */
1058
1059 static void
handle_pragma_push_options(cpp_reader *)1060 handle_pragma_push_options (cpp_reader *)
1061 {
1062 enum cpp_ttype token;
1063 tree x = 0;
1064
1065 token = pragma_lex (&x);
1066 if (token != CPP_EOF)
1067 {
1068 warning (OPT_Wpragmas, "junk at end of %<#pragma push_options%>");
1069 return;
1070 }
1071
1072 opt_stack *p = ggc_alloc<opt_stack> ();
1073 p->prev = options_stack;
1074 options_stack = p;
1075
1076 /* Save optimization and target flags in binary format. */
1077 if (flag_checking)
1078 {
1079 p->saved_global_options = XNEW (gcc_options);
1080 *p->saved_global_options = global_options;
1081 }
1082 p->optimize_binary = build_optimization_node (&global_options,
1083 &global_options_set);
1084 p->target_binary = build_target_option_node (&global_options,
1085 &global_options_set);
1086
1087 /* Save optimization and target flags in string list format. */
1088 p->optimize_strings = copy_list (current_optimize_pragma);
1089 p->target_strings = copy_list (current_target_pragma);
1090 }
1091
1092 /* Handle #pragma GCC pop_options to restore the current target and
1093 optimization options from a previous push_options. */
1094
1095 static void
handle_pragma_pop_options(cpp_reader *)1096 handle_pragma_pop_options (cpp_reader *)
1097 {
1098 enum cpp_ttype token;
1099 tree x = 0;
1100 opt_stack *p;
1101
1102 token = pragma_lex (&x);
1103 if (token != CPP_EOF)
1104 {
1105 warning (OPT_Wpragmas, "junk at end of %<#pragma pop_options%>");
1106 return;
1107 }
1108
1109 if (! options_stack)
1110 {
1111 warning (OPT_Wpragmas,
1112 "%<#pragma GCC pop_options%> without a corresponding "
1113 "%<#pragma GCC push_options%>");
1114 return;
1115 }
1116
1117 p = options_stack;
1118 options_stack = p->prev;
1119
1120 if (p->target_binary != target_option_current_node)
1121 {
1122 (void) targetm.target_option.pragma_parse (NULL_TREE, p->target_binary);
1123 target_option_current_node = p->target_binary;
1124 }
1125
1126 /* Always restore optimization options as optimization_current_node is
1127 * overwritten by invoke_set_current_function_hook. */
1128 cl_optimization_restore (&global_options, &global_options_set,
1129 TREE_OPTIMIZATION (p->optimize_binary));
1130 cl_target_option_restore (&global_options, &global_options_set,
1131 TREE_TARGET_OPTION (p->target_binary));
1132
1133 if (p->optimize_binary != optimization_current_node)
1134 {
1135 c_cpp_builtins_optimize_pragma (parse_in, optimization_current_node,
1136 p->optimize_binary);
1137 optimization_current_node = p->optimize_binary;
1138 }
1139 if (flag_checking && !seen_error ())
1140 {
1141 cl_optimization_compare (p->saved_global_options, &global_options);
1142 free (p->saved_global_options);
1143 }
1144
1145 current_target_pragma = p->target_strings;
1146 current_optimize_pragma = p->optimize_strings;
1147 }
1148
1149 /* Handle #pragma GCC reset_options to restore the current target and
1150 optimization options to the original options used on the command line. */
1151
1152 static void
handle_pragma_reset_options(cpp_reader *)1153 handle_pragma_reset_options (cpp_reader *)
1154 {
1155 enum cpp_ttype token;
1156 tree x = 0;
1157 tree new_optimize = optimization_default_node;
1158 tree new_target = target_option_default_node;
1159
1160 token = pragma_lex (&x);
1161 if (token != CPP_EOF)
1162 {
1163 warning (OPT_Wpragmas, "junk at end of %<#pragma reset_options%>");
1164 return;
1165 }
1166
1167 if (new_target != target_option_current_node)
1168 {
1169 (void) targetm.target_option.pragma_parse (NULL_TREE, new_target);
1170 target_option_current_node = new_target;
1171 }
1172
1173 if (new_optimize != optimization_current_node)
1174 {
1175 tree old_optimize = optimization_current_node;
1176 cl_optimization_restore (&global_options, &global_options_set,
1177 TREE_OPTIMIZATION (new_optimize));
1178 c_cpp_builtins_optimize_pragma (parse_in, old_optimize, new_optimize);
1179 optimization_current_node = new_optimize;
1180 }
1181
1182 current_target_pragma = NULL_TREE;
1183 current_optimize_pragma = NULL_TREE;
1184 }
1185
1186 /* Print a plain user-specified message. */
1187
1188 static void
handle_pragma_message(cpp_reader *)1189 handle_pragma_message (cpp_reader *)
1190 {
1191 location_t loc;
1192 enum cpp_ttype token;
1193 tree x, message = 0;
1194
1195 token = pragma_lex (&x);
1196 if (token == CPP_OPEN_PAREN)
1197 {
1198 token = pragma_lex (&x);
1199 if (token == CPP_STRING)
1200 message = x;
1201 else
1202 GCC_BAD ("expected a string after %<#pragma message%>");
1203 if (pragma_lex (&x) != CPP_CLOSE_PAREN)
1204 GCC_BAD ("malformed %<#pragma message%>, ignored");
1205 }
1206 else if (token == CPP_STRING)
1207 message = x;
1208 else
1209 GCC_BAD ("expected a string after %<#pragma message%>");
1210
1211 gcc_assert (message);
1212
1213 if (pragma_lex (&x, &loc) != CPP_EOF)
1214 warning_at (loc, OPT_Wpragmas, "junk at end of %<#pragma message%>");
1215
1216 if (TREE_STRING_LENGTH (message) > 1)
1217 inform (input_location, "%<#pragma message: %s%>",
1218 TREE_STRING_POINTER (message));
1219 }
1220
1221 /* Mark whether the current location is valid for a STDC pragma. */
1222
1223 static bool valid_location_for_stdc_pragma;
1224
1225 void
mark_valid_location_for_stdc_pragma(bool flag)1226 mark_valid_location_for_stdc_pragma (bool flag)
1227 {
1228 valid_location_for_stdc_pragma = flag;
1229 }
1230
1231 /* Return true if the current location is valid for a STDC pragma. */
1232
1233 bool
valid_location_for_stdc_pragma_p(void)1234 valid_location_for_stdc_pragma_p (void)
1235 {
1236 return valid_location_for_stdc_pragma;
1237 }
1238
1239 enum pragma_switch_t { PRAGMA_ON, PRAGMA_OFF, PRAGMA_DEFAULT, PRAGMA_BAD };
1240
1241 /* A STDC pragma must appear outside of external declarations or
1242 preceding all explicit declarations and statements inside a compound
1243 statement; its behavior is undefined if used in any other context.
1244 It takes a switch of ON, OFF, or DEFAULT. */
1245
1246 static enum pragma_switch_t
handle_stdc_pragma(const char * pname)1247 handle_stdc_pragma (const char *pname)
1248 {
1249 const char *arg;
1250 tree t;
1251 enum pragma_switch_t ret;
1252
1253 if (!valid_location_for_stdc_pragma_p ())
1254 {
1255 warning (OPT_Wpragmas, "invalid location for %<pragma %s%>, ignored",
1256 pname);
1257 return PRAGMA_BAD;
1258 }
1259
1260 if (pragma_lex (&t) != CPP_NAME)
1261 {
1262 warning (OPT_Wpragmas, "malformed %<#pragma %s%>, ignored", pname);
1263 return PRAGMA_BAD;
1264 }
1265
1266 arg = IDENTIFIER_POINTER (t);
1267
1268 if (!strcmp (arg, "ON"))
1269 ret = PRAGMA_ON;
1270 else if (!strcmp (arg, "OFF"))
1271 ret = PRAGMA_OFF;
1272 else if (!strcmp (arg, "DEFAULT"))
1273 ret = PRAGMA_DEFAULT;
1274 else
1275 {
1276 warning (OPT_Wpragmas, "malformed %<#pragma %s%>, ignored", pname);
1277 return PRAGMA_BAD;
1278 }
1279
1280 if (pragma_lex (&t) != CPP_EOF)
1281 {
1282 warning (OPT_Wpragmas, "junk at end of %<#pragma %s%>", pname);
1283 return PRAGMA_BAD;
1284 }
1285
1286 return ret;
1287 }
1288
1289 /* #pragma STDC FLOAT_CONST_DECIMAL64 ON
1290 #pragma STDC FLOAT_CONST_DECIMAL64 OFF
1291 #pragma STDC FLOAT_CONST_DECIMAL64 DEFAULT */
1292
1293 static void
handle_pragma_float_const_decimal64(cpp_reader *)1294 handle_pragma_float_const_decimal64 (cpp_reader *)
1295 {
1296 if (c_dialect_cxx ())
1297 {
1298 if (warn_unknown_pragmas > in_system_header_at (input_location))
1299 warning (OPT_Wunknown_pragmas,
1300 "%<#pragma STDC FLOAT_CONST_DECIMAL64%> is not supported"
1301 " for C++");
1302 return;
1303 }
1304
1305 if (!targetm.decimal_float_supported_p ())
1306 {
1307 if (warn_unknown_pragmas > in_system_header_at (input_location))
1308 warning (OPT_Wunknown_pragmas,
1309 "%<#pragma STDC FLOAT_CONST_DECIMAL64%> is not supported"
1310 " on this target");
1311 return;
1312 }
1313
1314 pedwarn (input_location, OPT_Wpedantic,
1315 "ISO C does not support %<#pragma STDC FLOAT_CONST_DECIMAL64%>");
1316
1317 switch (handle_stdc_pragma ("STDC FLOAT_CONST_DECIMAL64"))
1318 {
1319 case PRAGMA_ON:
1320 set_float_const_decimal64 ();
1321 break;
1322 case PRAGMA_OFF:
1323 case PRAGMA_DEFAULT:
1324 clear_float_const_decimal64 ();
1325 break;
1326 case PRAGMA_BAD:
1327 break;
1328 }
1329 }
1330
1331 /* A vector of registered pragma callbacks, which is never freed. */
1332
1333 static vec<internal_pragma_handler> registered_pragmas;
1334
1335 struct pragma_ns_name
1336 {
1337 const char *space;
1338 const char *name;
1339 };
1340
1341
1342 static vec<pragma_ns_name> registered_pp_pragmas;
1343
1344 struct omp_pragma_def { const char *name; unsigned int id; };
1345 static const struct omp_pragma_def oacc_pragmas[] = {
1346 { "atomic", PRAGMA_OACC_ATOMIC },
1347 { "cache", PRAGMA_OACC_CACHE },
1348 { "data", PRAGMA_OACC_DATA },
1349 { "declare", PRAGMA_OACC_DECLARE },
1350 { "enter", PRAGMA_OACC_ENTER_DATA },
1351 { "exit", PRAGMA_OACC_EXIT_DATA },
1352 { "host_data", PRAGMA_OACC_HOST_DATA },
1353 { "kernels", PRAGMA_OACC_KERNELS },
1354 { "loop", PRAGMA_OACC_LOOP },
1355 { "parallel", PRAGMA_OACC_PARALLEL },
1356 { "routine", PRAGMA_OACC_ROUTINE },
1357 { "serial", PRAGMA_OACC_SERIAL },
1358 { "update", PRAGMA_OACC_UPDATE },
1359 { "wait", PRAGMA_OACC_WAIT }
1360 };
1361 static const struct omp_pragma_def omp_pragmas[] = {
1362 { "allocate", PRAGMA_OMP_ALLOCATE },
1363 { "atomic", PRAGMA_OMP_ATOMIC },
1364 { "barrier", PRAGMA_OMP_BARRIER },
1365 { "cancel", PRAGMA_OMP_CANCEL },
1366 { "cancellation", PRAGMA_OMP_CANCELLATION_POINT },
1367 { "critical", PRAGMA_OMP_CRITICAL },
1368 { "depobj", PRAGMA_OMP_DEPOBJ },
1369 { "error", PRAGMA_OMP_ERROR },
1370 { "end", PRAGMA_OMP_END_DECLARE_TARGET },
1371 { "flush", PRAGMA_OMP_FLUSH },
1372 { "nothing", PRAGMA_OMP_NOTHING },
1373 { "requires", PRAGMA_OMP_REQUIRES },
1374 { "scope", PRAGMA_OMP_SCOPE },
1375 { "section", PRAGMA_OMP_SECTION },
1376 { "sections", PRAGMA_OMP_SECTIONS },
1377 { "single", PRAGMA_OMP_SINGLE },
1378 { "task", PRAGMA_OMP_TASK },
1379 { "taskgroup", PRAGMA_OMP_TASKGROUP },
1380 { "taskwait", PRAGMA_OMP_TASKWAIT },
1381 { "taskyield", PRAGMA_OMP_TASKYIELD },
1382 { "threadprivate", PRAGMA_OMP_THREADPRIVATE }
1383 };
1384 static const struct omp_pragma_def omp_pragmas_simd[] = {
1385 { "declare", PRAGMA_OMP_DECLARE },
1386 { "distribute", PRAGMA_OMP_DISTRIBUTE },
1387 { "for", PRAGMA_OMP_FOR },
1388 { "loop", PRAGMA_OMP_LOOP },
1389 { "masked", PRAGMA_OMP_MASKED },
1390 { "master", PRAGMA_OMP_MASTER },
1391 { "ordered", PRAGMA_OMP_ORDERED },
1392 { "parallel", PRAGMA_OMP_PARALLEL },
1393 { "scan", PRAGMA_OMP_SCAN },
1394 { "simd", PRAGMA_OMP_SIMD },
1395 { "target", PRAGMA_OMP_TARGET },
1396 { "taskloop", PRAGMA_OMP_TASKLOOP },
1397 { "teams", PRAGMA_OMP_TEAMS },
1398 };
1399
1400 void
c_pp_lookup_pragma(unsigned int id,const char ** space,const char ** name)1401 c_pp_lookup_pragma (unsigned int id, const char **space, const char **name)
1402 {
1403 const int n_oacc_pragmas = sizeof (oacc_pragmas) / sizeof (*oacc_pragmas);
1404 const int n_omp_pragmas = sizeof (omp_pragmas) / sizeof (*omp_pragmas);
1405 const int n_omp_pragmas_simd = sizeof (omp_pragmas_simd)
1406 / sizeof (*omp_pragmas);
1407 int i;
1408
1409 for (i = 0; i < n_oacc_pragmas; ++i)
1410 if (oacc_pragmas[i].id == id)
1411 {
1412 *space = "acc";
1413 *name = oacc_pragmas[i].name;
1414 return;
1415 }
1416
1417 for (i = 0; i < n_omp_pragmas; ++i)
1418 if (omp_pragmas[i].id == id)
1419 {
1420 *space = "omp";
1421 *name = omp_pragmas[i].name;
1422 return;
1423 }
1424
1425 for (i = 0; i < n_omp_pragmas_simd; ++i)
1426 if (omp_pragmas_simd[i].id == id)
1427 {
1428 *space = "omp";
1429 *name = omp_pragmas_simd[i].name;
1430 return;
1431 }
1432
1433 if (id >= PRAGMA_FIRST_EXTERNAL
1434 && (id < PRAGMA_FIRST_EXTERNAL + registered_pp_pragmas.length ()))
1435 {
1436 *space = registered_pp_pragmas[id - PRAGMA_FIRST_EXTERNAL].space;
1437 *name = registered_pp_pragmas[id - PRAGMA_FIRST_EXTERNAL].name;
1438 return;
1439 }
1440
1441 gcc_unreachable ();
1442 }
1443
1444 /* Front-end wrappers for pragma registration to avoid dragging
1445 cpplib.h in almost everywhere. */
1446
1447 static void
c_register_pragma_1(const char * space,const char * name,internal_pragma_handler ihandler,bool allow_expansion)1448 c_register_pragma_1 (const char *space, const char *name,
1449 internal_pragma_handler ihandler, bool allow_expansion)
1450 {
1451 unsigned id;
1452
1453 if (flag_preprocess_only)
1454 {
1455 pragma_ns_name ns_name;
1456
1457 if (!allow_expansion)
1458 return;
1459
1460 ns_name.space = space;
1461 ns_name.name = name;
1462 registered_pp_pragmas.safe_push (ns_name);
1463 id = registered_pp_pragmas.length ();
1464 id += PRAGMA_FIRST_EXTERNAL - 1;
1465 }
1466 else
1467 {
1468 registered_pragmas.safe_push (ihandler);
1469 id = registered_pragmas.length ();
1470 id += PRAGMA_FIRST_EXTERNAL - 1;
1471
1472 /* The C front end allocates 8 bits in c_token. The C++ front end
1473 keeps the pragma kind in the form of INTEGER_CST, so no small
1474 limit applies. At present this is sufficient. */
1475 gcc_assert (id < 256);
1476 }
1477
1478 cpp_register_deferred_pragma (parse_in, space, name, id,
1479 allow_expansion, false);
1480 }
1481
1482 /* Register a C pragma handler, using a space and a name. It disallows pragma
1483 expansion (if you want it, use c_register_pragma_with_expansion instead). */
1484 void
c_register_pragma(const char * space,const char * name,pragma_handler_1arg handler)1485 c_register_pragma (const char *space, const char *name,
1486 pragma_handler_1arg handler)
1487 {
1488 internal_pragma_handler ihandler;
1489
1490 ihandler.handler.handler_1arg = handler;
1491 ihandler.extra_data = false;
1492 ihandler.data = NULL;
1493 c_register_pragma_1 (space, name, ihandler, false);
1494 }
1495
1496 /* Register a C pragma handler, using a space and a name, it also carries an
1497 extra data field which can be used by the handler. It disallows pragma
1498 expansion (if you want it, use c_register_pragma_with_expansion_and_data
1499 instead). */
1500 void
c_register_pragma_with_data(const char * space,const char * name,pragma_handler_2arg handler,void * data)1501 c_register_pragma_with_data (const char *space, const char *name,
1502 pragma_handler_2arg handler, void * data)
1503 {
1504 internal_pragma_handler ihandler;
1505
1506 ihandler.handler.handler_2arg = handler;
1507 ihandler.extra_data = true;
1508 ihandler.data = data;
1509 c_register_pragma_1 (space, name, ihandler, false);
1510 }
1511
1512 /* Register a C pragma handler, using a space and a name. It allows pragma
1513 expansion as in the following example:
1514
1515 #define NUMBER 10
1516 #pragma count (NUMBER)
1517
1518 Name expansion is still disallowed. */
1519 void
c_register_pragma_with_expansion(const char * space,const char * name,pragma_handler_1arg handler)1520 c_register_pragma_with_expansion (const char *space, const char *name,
1521 pragma_handler_1arg handler)
1522 {
1523 internal_pragma_handler ihandler;
1524
1525 ihandler.handler.handler_1arg = handler;
1526 ihandler.extra_data = false;
1527 ihandler.data = NULL;
1528 c_register_pragma_1 (space, name, ihandler, true);
1529 }
1530
1531 /* Register a C pragma handler, using a space and a name, it also carries an
1532 extra data field which can be used by the handler. It allows pragma
1533 expansion as in the following example:
1534
1535 #define NUMBER 10
1536 #pragma count (NUMBER)
1537
1538 Name expansion is still disallowed. */
1539 void
c_register_pragma_with_expansion_and_data(const char * space,const char * name,pragma_handler_2arg handler,void * data)1540 c_register_pragma_with_expansion_and_data (const char *space, const char *name,
1541 pragma_handler_2arg handler,
1542 void *data)
1543 {
1544 internal_pragma_handler ihandler;
1545
1546 ihandler.handler.handler_2arg = handler;
1547 ihandler.extra_data = true;
1548 ihandler.data = data;
1549 c_register_pragma_1 (space, name, ihandler, true);
1550 }
1551
1552 void
c_invoke_pragma_handler(unsigned int id)1553 c_invoke_pragma_handler (unsigned int id)
1554 {
1555 internal_pragma_handler *ihandler;
1556 pragma_handler_1arg handler_1arg;
1557 pragma_handler_2arg handler_2arg;
1558
1559 id -= PRAGMA_FIRST_EXTERNAL;
1560 ihandler = ®istered_pragmas[id];
1561 if (ihandler->extra_data)
1562 {
1563 handler_2arg = ihandler->handler.handler_2arg;
1564 handler_2arg (parse_in, ihandler->data);
1565 }
1566 else
1567 {
1568 handler_1arg = ihandler->handler.handler_1arg;
1569 handler_1arg (parse_in);
1570 }
1571 }
1572
1573 /* Set up front-end pragmas. */
1574 void
init_pragma(void)1575 init_pragma (void)
1576 {
1577 if (flag_openacc)
1578 {
1579 const int n_oacc_pragmas
1580 = sizeof (oacc_pragmas) / sizeof (*oacc_pragmas);
1581 int i;
1582
1583 for (i = 0; i < n_oacc_pragmas; ++i)
1584 cpp_register_deferred_pragma (parse_in, "acc", oacc_pragmas[i].name,
1585 oacc_pragmas[i].id, true, true);
1586 }
1587
1588 if (flag_openmp)
1589 {
1590 const int n_omp_pragmas = sizeof (omp_pragmas) / sizeof (*omp_pragmas);
1591 int i;
1592
1593 for (i = 0; i < n_omp_pragmas; ++i)
1594 cpp_register_deferred_pragma (parse_in, "omp", omp_pragmas[i].name,
1595 omp_pragmas[i].id, true, true);
1596 }
1597 if (flag_openmp || flag_openmp_simd)
1598 {
1599 const int n_omp_pragmas_simd = sizeof (omp_pragmas_simd)
1600 / sizeof (*omp_pragmas);
1601 int i;
1602
1603 for (i = 0; i < n_omp_pragmas_simd; ++i)
1604 cpp_register_deferred_pragma (parse_in, "omp", omp_pragmas_simd[i].name,
1605 omp_pragmas_simd[i].id, true, true);
1606 }
1607
1608 if (!flag_preprocess_only)
1609 cpp_register_deferred_pragma (parse_in, "GCC", "pch_preprocess",
1610 PRAGMA_GCC_PCH_PREPROCESS, false, false);
1611
1612 if (!flag_preprocess_only)
1613 cpp_register_deferred_pragma (parse_in, "GCC", "ivdep", PRAGMA_IVDEP, false,
1614 false);
1615
1616 if (!flag_preprocess_only)
1617 cpp_register_deferred_pragma (parse_in, "GCC", "unroll", PRAGMA_UNROLL,
1618 false, false);
1619
1620 #ifdef HANDLE_PRAGMA_PACK_WITH_EXPANSION
1621 c_register_pragma_with_expansion (0, "pack", handle_pragma_pack);
1622 #else
1623 c_register_pragma (0, "pack", handle_pragma_pack);
1624 #endif
1625 c_register_pragma (0, "weak", handle_pragma_weak);
1626
1627 c_register_pragma ("GCC", "visibility", handle_pragma_visibility);
1628
1629 c_register_pragma ("GCC", "diagnostic", handle_pragma_diagnostic);
1630 c_register_pragma ("GCC", "target", handle_pragma_target);
1631 c_register_pragma ("GCC", "optimize", handle_pragma_optimize);
1632 c_register_pragma ("GCC", "push_options", handle_pragma_push_options);
1633 c_register_pragma ("GCC", "pop_options", handle_pragma_pop_options);
1634 c_register_pragma ("GCC", "reset_options", handle_pragma_reset_options);
1635
1636 c_register_pragma ("STDC", "FLOAT_CONST_DECIMAL64",
1637 handle_pragma_float_const_decimal64);
1638
1639 c_register_pragma_with_expansion (0, "redefine_extname",
1640 handle_pragma_redefine_extname);
1641
1642 c_register_pragma_with_expansion (0, "message", handle_pragma_message);
1643
1644 #ifdef REGISTER_TARGET_PRAGMAS
1645 REGISTER_TARGET_PRAGMAS ();
1646 #endif
1647
1648 global_sso = default_sso;
1649 c_register_pragma (0, "scalar_storage_order",
1650 handle_pragma_scalar_storage_order);
1651
1652 /* Allow plugins to register their own pragmas. */
1653 invoke_plugin_callbacks (PLUGIN_PRAGMAS, NULL);
1654 }
1655
1656 #include "gt-c-family-c-pragma.h"
1657