1 /* Handle #pragma, system V.4 style. Supports #pragma weak and #pragma pack.
2 Copyright (C) 1992, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
3 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
4
5 This file is part of GCC.
6
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 3, or (at your option) any later
10 version.
11
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
20
21 #include "config.h"
22 #include "system.h"
23 #include "coretypes.h"
24 #include "tm.h"
25 #include "tree.h"
26 #include "function.h" /* For cfun. FIXME: Does the parser know
27 when it is inside a function, so that
28 we don't have to look at cfun? */
29 #include "cpplib.h"
30 #include "c-pragma.h"
31 #include "flags.h"
32 #include "c-common.h"
33 #include "output.h"
34 #include "tm_p.h" /* For REGISTER_TARGET_PRAGMAS (why is
35 this not a target hook?). */
36 #include "vec.h"
37 #include "vecprim.h"
38 #include "target.h"
39 #include "diagnostic.h"
40 #include "opts.h"
41 #include "plugin.h"
42
43 #define GCC_BAD(gmsgid) \
44 do { warning (OPT_Wpragmas, gmsgid); return; } while (0)
45 #define GCC_BAD2(gmsgid, arg) \
46 do { warning (OPT_Wpragmas, gmsgid, arg); return; } while (0)
47
48 typedef struct GTY(()) align_stack {
49 int alignment;
50 tree id;
51 struct align_stack * prev;
52 } align_stack;
53
54 static GTY(()) struct align_stack * alignment_stack;
55
56 static void handle_pragma_pack (cpp_reader *);
57
58 /* If we have a "global" #pragma pack(<n>) in effect when the first
59 #pragma pack(push,<n>) is encountered, this stores the value of
60 maximum_field_alignment in effect. When the final pop_alignment()
61 happens, we restore the value to this, not to a value of 0 for
62 maximum_field_alignment. Value is in bits. */
63 static int default_alignment;
64 #define SET_GLOBAL_ALIGNMENT(ALIGN) (maximum_field_alignment = *(alignment_stack == NULL \
65 ? &default_alignment \
66 : &alignment_stack->alignment) = (ALIGN))
67
68 static void push_alignment (int, tree);
69 static void pop_alignment (tree);
70
71 /* Push an alignment value onto the stack. */
72 static void
push_alignment(int alignment,tree id)73 push_alignment (int alignment, tree id)
74 {
75 align_stack * entry;
76
77 entry = ggc_alloc_align_stack ();
78
79 entry->alignment = alignment;
80 entry->id = id;
81 entry->prev = alignment_stack;
82
83 /* The current value of maximum_field_alignment is not necessarily
84 0 since there may be a #pragma pack(<n>) in effect; remember it
85 so that we can restore it after the final #pragma pop(). */
86 if (alignment_stack == NULL)
87 default_alignment = maximum_field_alignment;
88
89 alignment_stack = entry;
90
91 maximum_field_alignment = alignment;
92 }
93
94 /* Undo a push of an alignment onto the stack. */
95 static void
pop_alignment(tree id)96 pop_alignment (tree id)
97 {
98 align_stack * entry;
99
100 if (alignment_stack == NULL)
101 GCC_BAD ("#pragma pack (pop) encountered without matching #pragma pack (push)");
102
103 /* If we got an identifier, strip away everything above the target
104 entry so that the next step will restore the state just below it. */
105 if (id)
106 {
107 for (entry = alignment_stack; entry; entry = entry->prev)
108 if (entry->id == id)
109 {
110 alignment_stack = entry;
111 break;
112 }
113 if (entry == NULL)
114 warning (OPT_Wpragmas, "\
115 #pragma pack(pop, %E) encountered without matching #pragma pack(push, %E)"
116 , id, id);
117 }
118
119 entry = alignment_stack->prev;
120
121 maximum_field_alignment = entry ? entry->alignment : default_alignment;
122
123 alignment_stack = entry;
124 }
125
126 /* #pragma pack ()
127 #pragma pack (N)
128
129 #pragma pack (push)
130 #pragma pack (push, N)
131 #pragma pack (push, ID)
132 #pragma pack (push, ID, N)
133 #pragma pack (pop)
134 #pragma pack (pop, ID) */
135 static void
handle_pragma_pack(cpp_reader * ARG_UNUSED (dummy))136 handle_pragma_pack (cpp_reader * ARG_UNUSED (dummy))
137 {
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);
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 ("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 ("unknown action %qE for %<#pragma pack%> - ignored", x);
176
177 while ((token = pragma_lex (&x)) == CPP_COMMA)
178 {
179 token = pragma_lex (&x);
180 if (token == CPP_NAME && id == 0)
181 {
182 id = x;
183 }
184 else if (token == CPP_NUMBER && action == push && align == -1)
185 {
186 if (TREE_CODE (x) != INTEGER_CST)
187 GCC_BAD ("invalid constant in %<#pragma pack%> - ignored");
188 align = TREE_INT_CST_LOW (x);
189 if (align == -1)
190 action = set;
191 }
192 else
193 GCC_BAD_ACTION;
194 }
195
196 if (token != CPP_CLOSE_PAREN)
197 GCC_BAD_ACTION;
198 #undef GCC_BAD_ACTION
199 }
200 else
201 GCC_BAD ("malformed %<#pragma pack%> - ignored");
202
203 if (pragma_lex (&x) != CPP_EOF)
204 warning (OPT_Wpragmas, "junk at end of %<#pragma pack%>");
205
206 if (flag_pack_struct)
207 GCC_BAD ("#pragma pack has no effect with -fpack-struct - ignored");
208
209 if (action != pop)
210 switch (align)
211 {
212 case 0:
213 case 1:
214 case 2:
215 case 4:
216 case 8:
217 case 16:
218 align *= BITS_PER_UNIT;
219 break;
220 case -1:
221 if (action == push)
222 {
223 align = maximum_field_alignment;
224 break;
225 }
226 default:
227 GCC_BAD2 ("alignment must be a small power of two, not %d", align);
228 }
229
230 switch (action)
231 {
232 case set: SET_GLOBAL_ALIGNMENT (align); break;
233 case push: push_alignment (align, id); break;
234 case pop: pop_alignment (id); break;
235 }
236 }
237
238 typedef struct GTY(()) pending_weak_d
239 {
240 tree name;
241 tree value;
242 } pending_weak;
243
244 DEF_VEC_O(pending_weak);
245 DEF_VEC_ALLOC_O(pending_weak,gc);
246
247 static GTY(()) VEC(pending_weak,gc) *pending_weaks;
248
249 static void apply_pragma_weak (tree, tree);
250 static void handle_pragma_weak (cpp_reader *);
251
252 static void
apply_pragma_weak(tree decl,tree value)253 apply_pragma_weak (tree decl, tree value)
254 {
255 if (value)
256 {
257 value = build_string (IDENTIFIER_LENGTH (value),
258 IDENTIFIER_POINTER (value));
259 decl_attributes (&decl, build_tree_list (get_identifier ("alias"),
260 build_tree_list (NULL, value)),
261 0);
262 }
263
264 if (SUPPORTS_WEAK && DECL_EXTERNAL (decl) && TREE_USED (decl)
265 && !DECL_WEAK (decl) /* Don't complain about a redundant #pragma. */
266 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
267 warning (OPT_Wpragmas, "applying #pragma weak %q+D after first use "
268 "results in unspecified behavior", decl);
269
270 declare_weak (decl);
271 }
272
273 void
maybe_apply_pragma_weak(tree decl)274 maybe_apply_pragma_weak (tree decl)
275 {
276 tree id;
277 int i;
278 pending_weak *pe;
279
280 /* Avoid asking for DECL_ASSEMBLER_NAME when it's not needed. */
281
282 /* No weak symbols pending, take the short-cut. */
283 if (!pending_weaks)
284 return;
285 /* If it's not visible outside this file, it doesn't matter whether
286 it's weak. */
287 if (!DECL_EXTERNAL (decl) && !TREE_PUBLIC (decl))
288 return;
289 /* If it's not a function or a variable, it can't be weak.
290 FIXME: what kinds of things are visible outside this file but
291 aren't functions or variables? Should this be an assert instead? */
292 if (TREE_CODE (decl) != FUNCTION_DECL && TREE_CODE (decl) != VAR_DECL)
293 return;
294
295 id = DECL_ASSEMBLER_NAME (decl);
296
297 FOR_EACH_VEC_ELT (pending_weak, pending_weaks, i, pe)
298 if (id == pe->name)
299 {
300 apply_pragma_weak (decl, pe->value);
301 VEC_unordered_remove (pending_weak, pending_weaks, i);
302 break;
303 }
304 }
305
306 /* Process all "#pragma weak A = B" directives where we have not seen
307 a decl for A. */
308 void
maybe_apply_pending_pragma_weaks(void)309 maybe_apply_pending_pragma_weaks (void)
310 {
311 tree alias_id, id, decl;
312 int i;
313 pending_weak *pe;
314
315 FOR_EACH_VEC_ELT (pending_weak, pending_weaks, i, pe)
316 {
317 alias_id = pe->name;
318 id = pe->value;
319
320 if (id == NULL)
321 continue;
322
323 decl = build_decl (UNKNOWN_LOCATION,
324 FUNCTION_DECL, alias_id, default_function_type);
325
326 DECL_ARTIFICIAL (decl) = 1;
327 TREE_PUBLIC (decl) = 1;
328 DECL_EXTERNAL (decl) = 1;
329 DECL_WEAK (decl) = 1;
330
331 assemble_alias (decl, id);
332 }
333 }
334
335 /* #pragma weak name [= value] */
336 static void
handle_pragma_weak(cpp_reader * ARG_UNUSED (dummy))337 handle_pragma_weak (cpp_reader * ARG_UNUSED (dummy))
338 {
339 tree name, value, x, decl;
340 enum cpp_ttype t;
341
342 value = 0;
343
344 if (pragma_lex (&name) != CPP_NAME)
345 GCC_BAD ("malformed #pragma weak, ignored");
346 t = pragma_lex (&x);
347 if (t == CPP_EQ)
348 {
349 if (pragma_lex (&value) != CPP_NAME)
350 GCC_BAD ("malformed #pragma weak, ignored");
351 t = pragma_lex (&x);
352 }
353 if (t != CPP_EOF)
354 warning (OPT_Wpragmas, "junk at end of %<#pragma weak%>");
355
356 decl = identifier_global_value (name);
357 if (decl && DECL_P (decl))
358 {
359 apply_pragma_weak (decl, value);
360 if (value)
361 assemble_alias (decl, value);
362 }
363 else
364 {
365 pending_weak *pe;
366 pe = VEC_safe_push (pending_weak, gc, pending_weaks, NULL);
367 pe->name = name;
368 pe->value = value;
369 }
370 }
371
372 /* GCC supports two #pragma directives for renaming the external
373 symbol associated with a declaration (DECL_ASSEMBLER_NAME), for
374 compatibility with the Solaris and Tru64 system headers. GCC also
375 has its own notation for this, __asm__("name") annotations.
376
377 Corner cases of these features and their interaction:
378
379 1) Both pragmas silently apply only to declarations with external
380 linkage (that is, TREE_PUBLIC || DECL_EXTERNAL). Asm labels
381 do not have this restriction.
382
383 2) In C++, both #pragmas silently apply only to extern "C" declarations.
384 Asm labels do not have this restriction.
385
386 3) If any of the three ways of changing DECL_ASSEMBLER_NAME is
387 applied to a decl whose DECL_ASSEMBLER_NAME is already set, and the
388 new name is different, a warning issues and the name does not change.
389
390 4) The "source name" for #pragma redefine_extname is the DECL_NAME,
391 *not* the DECL_ASSEMBLER_NAME.
392
393 5) If #pragma extern_prefix is in effect and a declaration occurs
394 with an __asm__ name, the #pragma extern_prefix is silently
395 ignored for that declaration.
396
397 6) If #pragma extern_prefix and #pragma redefine_extname apply to
398 the same declaration, whichever triggered first wins, and a warning
399 is issued. (We would like to have #pragma redefine_extname always
400 win, but it can appear either before or after the declaration, and
401 if it appears afterward, we have no way of knowing whether a modified
402 DECL_ASSEMBLER_NAME is due to #pragma extern_prefix.) */
403
404 typedef struct GTY(()) pending_redefinition_d {
405 tree oldname;
406 tree newname;
407 } pending_redefinition;
408
409 DEF_VEC_O(pending_redefinition);
410 DEF_VEC_ALLOC_O(pending_redefinition,gc);
411
412 static GTY(()) VEC(pending_redefinition,gc) *pending_redefine_extname;
413
414 static void handle_pragma_redefine_extname (cpp_reader *);
415
416 /* #pragma redefine_extname oldname newname */
417 static void
handle_pragma_redefine_extname(cpp_reader * ARG_UNUSED (dummy))418 handle_pragma_redefine_extname (cpp_reader * ARG_UNUSED (dummy))
419 {
420 tree oldname, newname, decls, x;
421 enum cpp_ttype t;
422 bool found;
423
424 if (pragma_lex (&oldname) != CPP_NAME)
425 GCC_BAD ("malformed #pragma redefine_extname, ignored");
426 if (pragma_lex (&newname) != CPP_NAME)
427 GCC_BAD ("malformed #pragma redefine_extname, ignored");
428 t = pragma_lex (&x);
429 if (t != CPP_EOF)
430 warning (OPT_Wpragmas, "junk at end of %<#pragma redefine_extname%>");
431
432 found = false;
433 for (decls = c_linkage_bindings (oldname);
434 decls; )
435 {
436 tree decl;
437 if (TREE_CODE (decls) == TREE_LIST)
438 {
439 decl = TREE_VALUE (decls);
440 decls = TREE_CHAIN (decls);
441 }
442 else
443 {
444 decl = decls;
445 decls = NULL_TREE;
446 }
447
448 if ((TREE_PUBLIC (decl) || DECL_EXTERNAL (decl))
449 && (TREE_CODE (decl) == FUNCTION_DECL
450 || TREE_CODE (decl) == VAR_DECL))
451 {
452 found = true;
453 if (DECL_ASSEMBLER_NAME_SET_P (decl))
454 {
455 const char *name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
456 name = targetm.strip_name_encoding (name);
457
458 if (strcmp (name, IDENTIFIER_POINTER (newname)))
459 warning (OPT_Wpragmas, "#pragma redefine_extname ignored due to "
460 "conflict with previous rename");
461 }
462 else
463 change_decl_assembler_name (decl, newname);
464 }
465 }
466
467 if (!found)
468 /* We have to add this to the rename list even if there's already
469 a global value that doesn't meet the above criteria, because in
470 C++ "struct foo {...};" puts "foo" in the current namespace but
471 does *not* conflict with a subsequent declaration of a function
472 or variable foo. See g++.dg/other/pragma-re-2.C. */
473 add_to_renaming_pragma_list (oldname, newname);
474 }
475
476 /* This is called from here and from ia64.c. */
477 void
add_to_renaming_pragma_list(tree oldname,tree newname)478 add_to_renaming_pragma_list (tree oldname, tree newname)
479 {
480 unsigned ix;
481 pending_redefinition *p;
482
483 FOR_EACH_VEC_ELT (pending_redefinition, pending_redefine_extname, ix, p)
484 if (oldname == p->oldname)
485 {
486 if (p->newname != newname)
487 warning (OPT_Wpragmas, "#pragma redefine_extname ignored due to "
488 "conflict with previous #pragma redefine_extname");
489 return;
490 }
491
492 p = VEC_safe_push (pending_redefinition, gc, pending_redefine_extname, NULL);
493 p->oldname = oldname;
494 p->newname = newname;
495 }
496
497 /* The current prefix set by #pragma extern_prefix. */
498 GTY(()) tree pragma_extern_prefix;
499
500 /* #pragma extern_prefix "prefix" */
501 static void
handle_pragma_extern_prefix(cpp_reader * ARG_UNUSED (dummy))502 handle_pragma_extern_prefix (cpp_reader * ARG_UNUSED (dummy))
503 {
504 tree prefix, x;
505 enum cpp_ttype t;
506
507 if (pragma_lex (&prefix) != CPP_STRING)
508 GCC_BAD ("malformed #pragma extern_prefix, ignored");
509 t = pragma_lex (&x);
510 if (t != CPP_EOF)
511 warning (OPT_Wpragmas, "junk at end of %<#pragma extern_prefix%>");
512
513 if (targetm.handle_pragma_extern_prefix)
514 /* Note that the length includes the null terminator. */
515 pragma_extern_prefix = (TREE_STRING_LENGTH (prefix) > 1 ? prefix : NULL);
516 else if (warn_unknown_pragmas > in_system_header)
517 warning (OPT_Wunknown_pragmas,
518 "#pragma extern_prefix not supported on this target");
519 }
520
521 /* Hook from the front ends to apply the results of one of the preceding
522 pragmas that rename variables. */
523
524 tree
maybe_apply_renaming_pragma(tree decl,tree asmname)525 maybe_apply_renaming_pragma (tree decl, tree asmname)
526 {
527 unsigned ix;
528 pending_redefinition *p;
529
530 /* The renaming pragmas are only applied to declarations with
531 external linkage. */
532 if ((TREE_CODE (decl) != FUNCTION_DECL && TREE_CODE (decl) != VAR_DECL)
533 || (!TREE_PUBLIC (decl) && !DECL_EXTERNAL (decl))
534 || !has_c_linkage (decl))
535 return asmname;
536
537 /* If the DECL_ASSEMBLER_NAME is already set, it does not change,
538 but we may warn about a rename that conflicts. */
539 if (DECL_ASSEMBLER_NAME_SET_P (decl))
540 {
541 const char *oldname = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
542 oldname = targetm.strip_name_encoding (oldname);
543
544 if (asmname && strcmp (TREE_STRING_POINTER (asmname), oldname))
545 warning (OPT_Wpragmas, "asm declaration ignored due to "
546 "conflict with previous rename");
547
548 /* Take any pending redefine_extname off the list. */
549 FOR_EACH_VEC_ELT (pending_redefinition, pending_redefine_extname, ix, p)
550 if (DECL_NAME (decl) == p->oldname)
551 {
552 /* Only warn if there is a conflict. */
553 if (strcmp (IDENTIFIER_POINTER (p->newname), oldname))
554 warning (OPT_Wpragmas, "#pragma redefine_extname ignored due to "
555 "conflict with previous rename");
556
557 VEC_unordered_remove (pending_redefinition,
558 pending_redefine_extname, ix);
559 break;
560 }
561 return 0;
562 }
563
564 /* Find out if we have a pending #pragma redefine_extname. */
565 FOR_EACH_VEC_ELT (pending_redefinition, pending_redefine_extname, ix, p)
566 if (DECL_NAME (decl) == p->oldname)
567 {
568 tree newname = p->newname;
569 VEC_unordered_remove (pending_redefinition,
570 pending_redefine_extname, ix);
571
572 /* If we already have an asmname, #pragma redefine_extname is
573 ignored (with a warning if it conflicts). */
574 if (asmname)
575 {
576 if (strcmp (TREE_STRING_POINTER (asmname),
577 IDENTIFIER_POINTER (newname)) != 0)
578 warning (OPT_Wpragmas, "#pragma redefine_extname ignored due to "
579 "conflict with __asm__ declaration");
580 return asmname;
581 }
582
583 /* Otherwise we use what we've got; #pragma extern_prefix is
584 silently ignored. */
585 return build_string (IDENTIFIER_LENGTH (newname),
586 IDENTIFIER_POINTER (newname));
587 }
588
589 /* If we've got an asmname, #pragma extern_prefix is silently ignored. */
590 if (asmname)
591 return asmname;
592
593 /* If #pragma extern_prefix is in effect, apply it. */
594 if (pragma_extern_prefix)
595 {
596 const char *prefix = TREE_STRING_POINTER (pragma_extern_prefix);
597 size_t plen = TREE_STRING_LENGTH (pragma_extern_prefix) - 1;
598
599 const char *id = IDENTIFIER_POINTER (DECL_NAME (decl));
600 size_t ilen = IDENTIFIER_LENGTH (DECL_NAME (decl));
601
602 char *newname = (char *) alloca (plen + ilen + 1);
603
604 memcpy (newname, prefix, plen);
605 memcpy (newname + plen, id, ilen + 1);
606
607 return build_string (plen + ilen, newname);
608 }
609
610 /* Nada. */
611 return 0;
612 }
613
614
615 static void handle_pragma_visibility (cpp_reader *);
616
617 static VEC (int, heap) *visstack;
618
619 /* Push the visibility indicated by STR onto the top of the #pragma
620 visibility stack. KIND is 0 for #pragma GCC visibility, 1 for
621 C++ namespace with visibility attribute and 2 for C++ builtin
622 ABI namespace. push_visibility/pop_visibility calls must have
623 matching KIND, it is not allowed to push visibility using one
624 KIND and pop using a different one. */
625
626 void
push_visibility(const char * str,int kind)627 push_visibility (const char *str, int kind)
628 {
629 VEC_safe_push (int, heap, visstack,
630 ((int) default_visibility) | (kind << 8));
631 if (!strcmp (str, "default"))
632 default_visibility = VISIBILITY_DEFAULT;
633 else if (!strcmp (str, "internal"))
634 default_visibility = VISIBILITY_INTERNAL;
635 else if (!strcmp (str, "hidden"))
636 default_visibility = VISIBILITY_HIDDEN;
637 else if (!strcmp (str, "protected"))
638 default_visibility = VISIBILITY_PROTECTED;
639 else
640 GCC_BAD ("#pragma GCC visibility push() must specify default, internal, hidden or protected");
641 visibility_options.inpragma = 1;
642 }
643
644 /* Pop a level of the #pragma visibility stack. Return true if
645 successful. */
646
647 bool
pop_visibility(int kind)648 pop_visibility (int kind)
649 {
650 if (!VEC_length (int, visstack))
651 return false;
652 if ((VEC_last (int, visstack) >> 8) != kind)
653 return false;
654 default_visibility
655 = (enum symbol_visibility) (VEC_pop (int, visstack) & 0xff);
656 visibility_options.inpragma
657 = VEC_length (int, visstack) != 0;
658 return true;
659 }
660
661 /* Sets the default visibility for symbols to something other than that
662 specified on the command line. */
663
664 static void
handle_pragma_visibility(cpp_reader * dummy ATTRIBUTE_UNUSED)665 handle_pragma_visibility (cpp_reader *dummy ATTRIBUTE_UNUSED)
666 {
667 /* Form is #pragma GCC visibility push(hidden)|pop */
668 tree x;
669 enum cpp_ttype token;
670 enum { bad, push, pop } action = bad;
671
672 token = pragma_lex (&x);
673 if (token == CPP_NAME)
674 {
675 const char *op = IDENTIFIER_POINTER (x);
676 if (!strcmp (op, "push"))
677 action = push;
678 else if (!strcmp (op, "pop"))
679 action = pop;
680 }
681 if (bad == action)
682 GCC_BAD ("#pragma GCC visibility must be followed by push or pop");
683 else
684 {
685 if (pop == action)
686 {
687 if (! pop_visibility (0))
688 GCC_BAD ("no matching push for %<#pragma GCC visibility pop%>");
689 }
690 else
691 {
692 if (pragma_lex (&x) != CPP_OPEN_PAREN)
693 GCC_BAD ("missing %<(%> after %<#pragma GCC visibility push%> - ignored");
694 token = pragma_lex (&x);
695 if (token != CPP_NAME)
696 GCC_BAD ("malformed #pragma GCC visibility push");
697 else
698 push_visibility (IDENTIFIER_POINTER (x), 0);
699 if (pragma_lex (&x) != CPP_CLOSE_PAREN)
700 GCC_BAD ("missing %<(%> after %<#pragma GCC visibility push%> - ignored");
701 }
702 }
703 if (pragma_lex (&x) != CPP_EOF)
704 warning (OPT_Wpragmas, "junk at end of %<#pragma GCC visibility%>");
705 }
706
707 static void
handle_pragma_diagnostic(cpp_reader * ARG_UNUSED (dummy))708 handle_pragma_diagnostic(cpp_reader *ARG_UNUSED(dummy))
709 {
710 const char *kind_string, *option_string;
711 unsigned int option_index;
712 enum cpp_ttype token;
713 diagnostic_t kind;
714 tree x;
715 struct cl_option_handlers handlers;
716
717 token = pragma_lex (&x);
718 if (token != CPP_NAME)
719 GCC_BAD ("missing [error|warning|ignored] after %<#pragma GCC diagnostic%>");
720 kind_string = IDENTIFIER_POINTER (x);
721 if (strcmp (kind_string, "error") == 0)
722 kind = DK_ERROR;
723 else if (strcmp (kind_string, "warning") == 0)
724 kind = DK_WARNING;
725 else if (strcmp (kind_string, "ignored") == 0)
726 kind = DK_IGNORED;
727 else if (strcmp (kind_string, "push") == 0)
728 {
729 diagnostic_push_diagnostics (global_dc, input_location);
730 return;
731 }
732 else if (strcmp (kind_string, "pop") == 0)
733 {
734 diagnostic_pop_diagnostics (global_dc, input_location);
735 return;
736 }
737 else
738 GCC_BAD ("expected [error|warning|ignored|push|pop] after %<#pragma GCC diagnostic%>");
739
740 token = pragma_lex (&x);
741 if (token != CPP_STRING)
742 GCC_BAD ("missing option after %<#pragma GCC diagnostic%> kind");
743 option_string = TREE_STRING_POINTER (x);
744 set_default_handlers (&handlers);
745 for (option_index = 0; option_index < cl_options_count; option_index++)
746 if (strcmp (cl_options[option_index].opt_text, option_string) == 0)
747 {
748 control_warning_option (option_index, (int) kind, kind != DK_IGNORED,
749 input_location, c_family_lang_mask, &handlers,
750 &global_options, &global_options_set,
751 global_dc);
752 return;
753 }
754 GCC_BAD ("unknown option after %<#pragma GCC diagnostic%> kind");
755 }
756
757 /* Parse #pragma GCC target (xxx) to set target specific options. */
758 static void
handle_pragma_target(cpp_reader * ARG_UNUSED (dummy))759 handle_pragma_target(cpp_reader *ARG_UNUSED(dummy))
760 {
761 enum cpp_ttype token;
762 tree x;
763 bool close_paren_needed_p = false;
764
765 if (cfun)
766 {
767 error ("#pragma GCC option is not allowed inside functions");
768 return;
769 }
770
771 token = pragma_lex (&x);
772 if (token == CPP_OPEN_PAREN)
773 {
774 close_paren_needed_p = true;
775 token = pragma_lex (&x);
776 }
777
778 if (token != CPP_STRING)
779 {
780 GCC_BAD ("%<#pragma GCC option%> is not a string");
781 return;
782 }
783
784 /* Strings are user options. */
785 else
786 {
787 tree args = NULL_TREE;
788
789 do
790 {
791 /* Build up the strings now as a tree linked list. Skip empty
792 strings. */
793 if (TREE_STRING_LENGTH (x) > 0)
794 args = tree_cons (NULL_TREE, x, args);
795
796 token = pragma_lex (&x);
797 while (token == CPP_COMMA)
798 token = pragma_lex (&x);
799 }
800 while (token == CPP_STRING);
801
802 if (close_paren_needed_p)
803 {
804 if (token == CPP_CLOSE_PAREN)
805 token = pragma_lex (&x);
806 else
807 GCC_BAD ("%<#pragma GCC target (string [,string]...)%> does "
808 "not have a final %<)%>");
809 }
810
811 if (token != CPP_EOF)
812 {
813 error ("#pragma GCC target string... is badly formed");
814 return;
815 }
816
817 /* put arguments in the order the user typed them. */
818 args = nreverse (args);
819
820 if (targetm.target_option.pragma_parse (args, NULL_TREE))
821 current_target_pragma = args;
822 }
823 }
824
825 /* Handle #pragma GCC optimize to set optimization options. */
826 static void
handle_pragma_optimize(cpp_reader * ARG_UNUSED (dummy))827 handle_pragma_optimize (cpp_reader *ARG_UNUSED(dummy))
828 {
829 enum cpp_ttype token;
830 tree x;
831 bool close_paren_needed_p = false;
832 tree optimization_previous_node = optimization_current_node;
833
834 if (cfun)
835 {
836 error ("#pragma GCC optimize is not allowed inside functions");
837 return;
838 }
839
840 token = pragma_lex (&x);
841 if (token == CPP_OPEN_PAREN)
842 {
843 close_paren_needed_p = true;
844 token = pragma_lex (&x);
845 }
846
847 if (token != CPP_STRING && token != CPP_NUMBER)
848 {
849 GCC_BAD ("%<#pragma GCC optimize%> is not a string or number");
850 return;
851 }
852
853 /* Strings/numbers are user options. */
854 else
855 {
856 tree args = NULL_TREE;
857
858 do
859 {
860 /* Build up the numbers/strings now as a list. */
861 if (token != CPP_STRING || TREE_STRING_LENGTH (x) > 0)
862 args = tree_cons (NULL_TREE, x, args);
863
864 token = pragma_lex (&x);
865 while (token == CPP_COMMA)
866 token = pragma_lex (&x);
867 }
868 while (token == CPP_STRING || token == CPP_NUMBER);
869
870 if (close_paren_needed_p)
871 {
872 if (token == CPP_CLOSE_PAREN)
873 token = pragma_lex (&x);
874 else
875 GCC_BAD ("%<#pragma GCC optimize (string [,string]...)%> does "
876 "not have a final %<)%>");
877 }
878
879 if (token != CPP_EOF)
880 {
881 error ("#pragma GCC optimize string... is badly formed");
882 return;
883 }
884
885 /* put arguments in the order the user typed them. */
886 args = nreverse (args);
887
888 parse_optimize_options (args, false);
889 current_optimize_pragma = chainon (current_optimize_pragma, args);
890 optimization_current_node = build_optimization_node ();
891 c_cpp_builtins_optimize_pragma (parse_in,
892 optimization_previous_node,
893 optimization_current_node);
894 }
895 }
896
897 /* Stack of the #pragma GCC options created with #pragma GCC push_option. Save
898 both the binary representation of the options and the TREE_LIST of
899 strings that will be added to the function's attribute list. */
900 typedef struct GTY(()) opt_stack {
901 struct opt_stack *prev;
902 tree target_binary;
903 tree target_strings;
904 tree optimize_binary;
905 tree optimize_strings;
906 } opt_stack;
907
908 static GTY(()) struct opt_stack * options_stack;
909
910 /* Handle #pragma GCC push_options to save the current target and optimization
911 options. */
912
913 static void
handle_pragma_push_options(cpp_reader * ARG_UNUSED (dummy))914 handle_pragma_push_options (cpp_reader *ARG_UNUSED(dummy))
915 {
916 enum cpp_ttype token;
917 tree x = 0;
918 opt_stack *p;
919
920 token = pragma_lex (&x);
921 if (token != CPP_EOF)
922 {
923 warning (OPT_Wpragmas, "junk at end of %<#pragma push_options%>");
924 return;
925 }
926
927 p = ggc_alloc_opt_stack ();
928 p->prev = options_stack;
929 options_stack = p;
930
931 /* Save optimization and target flags in binary format. */
932 p->optimize_binary = build_optimization_node ();
933 p->target_binary = build_target_option_node ();
934
935 /* Save optimization and target flags in string list format. */
936 p->optimize_strings = copy_list (current_optimize_pragma);
937 p->target_strings = copy_list (current_target_pragma);
938 }
939
940 /* Handle #pragma GCC pop_options to restore the current target and
941 optimization options from a previous push_options. */
942
943 static void
handle_pragma_pop_options(cpp_reader * ARG_UNUSED (dummy))944 handle_pragma_pop_options (cpp_reader *ARG_UNUSED(dummy))
945 {
946 enum cpp_ttype token;
947 tree x = 0;
948 opt_stack *p;
949
950 token = pragma_lex (&x);
951 if (token != CPP_EOF)
952 {
953 warning (OPT_Wpragmas, "junk at end of %<#pragma pop_options%>");
954 return;
955 }
956
957 if (! options_stack)
958 {
959 warning (OPT_Wpragmas,
960 "%<#pragma GCC pop_options%> without a corresponding "
961 "%<#pragma GCC push_options%>");
962 return;
963 }
964
965 p = options_stack;
966 options_stack = p->prev;
967
968 if (p->target_binary != target_option_current_node)
969 {
970 (void) targetm.target_option.pragma_parse (NULL_TREE, p->target_binary);
971 target_option_current_node = p->target_binary;
972 }
973
974 if (p->optimize_binary != optimization_current_node)
975 {
976 tree old_optimize = optimization_current_node;
977 cl_optimization_restore (&global_options,
978 TREE_OPTIMIZATION (p->optimize_binary));
979 c_cpp_builtins_optimize_pragma (parse_in, old_optimize,
980 p->optimize_binary);
981 optimization_current_node = p->optimize_binary;
982 }
983
984 current_target_pragma = p->target_strings;
985 current_optimize_pragma = p->optimize_strings;
986 }
987
988 /* Handle #pragma GCC reset_options to restore the current target and
989 optimization options to the original options used on the command line. */
990
991 static void
handle_pragma_reset_options(cpp_reader * ARG_UNUSED (dummy))992 handle_pragma_reset_options (cpp_reader *ARG_UNUSED(dummy))
993 {
994 enum cpp_ttype token;
995 tree x = 0;
996 tree new_optimize = optimization_default_node;
997 tree new_target = target_option_default_node;
998
999 token = pragma_lex (&x);
1000 if (token != CPP_EOF)
1001 {
1002 warning (OPT_Wpragmas, "junk at end of %<#pragma reset_options%>");
1003 return;
1004 }
1005
1006 if (new_target != target_option_current_node)
1007 {
1008 (void) targetm.target_option.pragma_parse (NULL_TREE, new_target);
1009 target_option_current_node = new_target;
1010 }
1011
1012 if (new_optimize != optimization_current_node)
1013 {
1014 tree old_optimize = optimization_current_node;
1015 cl_optimization_restore (&global_options,
1016 TREE_OPTIMIZATION (new_optimize));
1017 c_cpp_builtins_optimize_pragma (parse_in, old_optimize, new_optimize);
1018 optimization_current_node = new_optimize;
1019 }
1020
1021 current_target_pragma = NULL_TREE;
1022 current_optimize_pragma = NULL_TREE;
1023 }
1024
1025 /* Print a plain user-specified message. */
1026
1027 static void
handle_pragma_message(cpp_reader * ARG_UNUSED (dummy))1028 handle_pragma_message (cpp_reader *ARG_UNUSED(dummy))
1029 {
1030 enum cpp_ttype token;
1031 tree x, message = 0;
1032
1033 token = pragma_lex (&x);
1034 if (token == CPP_OPEN_PAREN)
1035 {
1036 token = pragma_lex (&x);
1037 if (token == CPP_STRING)
1038 message = x;
1039 else
1040 GCC_BAD ("expected a string after %<#pragma message%>");
1041 if (pragma_lex (&x) != CPP_CLOSE_PAREN)
1042 GCC_BAD ("malformed %<#pragma message%>, ignored");
1043 }
1044 else if (token == CPP_STRING)
1045 message = x;
1046 else
1047 GCC_BAD ("expected a string after %<#pragma message%>");
1048
1049 gcc_assert (message);
1050
1051 if (pragma_lex (&x) != CPP_EOF)
1052 warning (OPT_Wpragmas, "junk at end of %<#pragma message%>");
1053
1054 if (TREE_STRING_LENGTH (message) > 1)
1055 inform (input_location, "#pragma message: %s", TREE_STRING_POINTER (message));
1056 }
1057
1058 /* Mark whether the current location is valid for a STDC pragma. */
1059
1060 static bool valid_location_for_stdc_pragma;
1061
1062 void
mark_valid_location_for_stdc_pragma(bool flag)1063 mark_valid_location_for_stdc_pragma (bool flag)
1064 {
1065 valid_location_for_stdc_pragma = flag;
1066 }
1067
1068 /* Return true if the current location is valid for a STDC pragma. */
1069
1070 bool
valid_location_for_stdc_pragma_p(void)1071 valid_location_for_stdc_pragma_p (void)
1072 {
1073 return valid_location_for_stdc_pragma;
1074 }
1075
1076 enum pragma_switch_t { PRAGMA_ON, PRAGMA_OFF, PRAGMA_DEFAULT, PRAGMA_BAD };
1077
1078 /* A STDC pragma must appear outside of external declarations or
1079 preceding all explicit declarations and statements inside a compound
1080 statement; its behavior is undefined if used in any other context.
1081 It takes a switch of ON, OFF, or DEFAULT. */
1082
1083 static enum pragma_switch_t
handle_stdc_pragma(const char * pname)1084 handle_stdc_pragma (const char *pname)
1085 {
1086 const char *arg;
1087 tree t;
1088 enum pragma_switch_t ret;
1089
1090 if (!valid_location_for_stdc_pragma_p ())
1091 {
1092 warning (OPT_Wpragmas, "invalid location for %<pragma %s%>, ignored",
1093 pname);
1094 return PRAGMA_BAD;
1095 }
1096
1097 if (pragma_lex (&t) != CPP_NAME)
1098 {
1099 warning (OPT_Wpragmas, "malformed %<#pragma %s%>, ignored", pname);
1100 return PRAGMA_BAD;
1101 }
1102
1103 arg = IDENTIFIER_POINTER (t);
1104
1105 if (!strcmp (arg, "ON"))
1106 ret = PRAGMA_ON;
1107 else if (!strcmp (arg, "OFF"))
1108 ret = PRAGMA_OFF;
1109 else if (!strcmp (arg, "DEFAULT"))
1110 ret = PRAGMA_DEFAULT;
1111 else
1112 {
1113 warning (OPT_Wpragmas, "malformed %<#pragma %s%>, ignored", pname);
1114 return PRAGMA_BAD;
1115 }
1116
1117 if (pragma_lex (&t) != CPP_EOF)
1118 {
1119 warning (OPT_Wpragmas, "junk at end of %<#pragma %s%>", pname);
1120 return PRAGMA_BAD;
1121 }
1122
1123 return ret;
1124 }
1125
1126 /* #pragma STDC FLOAT_CONST_DECIMAL64 ON
1127 #pragma STDC FLOAT_CONST_DECIMAL64 OFF
1128 #pragma STDC FLOAT_CONST_DECIMAL64 DEFAULT */
1129
1130 static void
handle_pragma_float_const_decimal64(cpp_reader * ARG_UNUSED (dummy))1131 handle_pragma_float_const_decimal64 (cpp_reader *ARG_UNUSED (dummy))
1132 {
1133 if (c_dialect_cxx ())
1134 {
1135 if (warn_unknown_pragmas > in_system_header)
1136 warning (OPT_Wunknown_pragmas,
1137 "%<#pragma STDC FLOAT_CONST_DECIMAL64%> is not supported"
1138 " for C++");
1139 return;
1140 }
1141
1142 if (!targetm.decimal_float_supported_p ())
1143 {
1144 if (warn_unknown_pragmas > in_system_header)
1145 warning (OPT_Wunknown_pragmas,
1146 "%<#pragma STDC FLOAT_CONST_DECIMAL64%> is not supported"
1147 " on this target");
1148 return;
1149 }
1150
1151 pedwarn (input_location, OPT_pedantic,
1152 "ISO C does not support %<#pragma STDC FLOAT_CONST_DECIMAL64%>");
1153
1154 switch (handle_stdc_pragma ("STDC FLOAT_CONST_DECIMAL64"))
1155 {
1156 case PRAGMA_ON:
1157 set_float_const_decimal64 ();
1158 break;
1159 case PRAGMA_OFF:
1160 case PRAGMA_DEFAULT:
1161 clear_float_const_decimal64 ();
1162 break;
1163 case PRAGMA_BAD:
1164 break;
1165 }
1166 }
1167
1168 /* A vector of registered pragma callbacks, which is never freed. */
1169 DEF_VEC_O (internal_pragma_handler);
1170 DEF_VEC_ALLOC_O (internal_pragma_handler, heap);
1171
VEC(internal_pragma_handler,heap)1172 static VEC(internal_pragma_handler, heap) *registered_pragmas;
1173
1174 typedef struct
1175 {
1176 const char *space;
1177 const char *name;
1178 } pragma_ns_name;
1179
1180 DEF_VEC_O (pragma_ns_name);
1181 DEF_VEC_ALLOC_O (pragma_ns_name, heap);
1182
VEC(pragma_ns_name,heap)1183 static VEC(pragma_ns_name, heap) *registered_pp_pragmas;
1184
1185 struct omp_pragma_def { const char *name; unsigned int id; };
1186 static const struct omp_pragma_def omp_pragmas[] = {
1187 { "atomic", PRAGMA_OMP_ATOMIC },
1188 { "barrier", PRAGMA_OMP_BARRIER },
1189 { "critical", PRAGMA_OMP_CRITICAL },
1190 { "flush", PRAGMA_OMP_FLUSH },
1191 { "for", PRAGMA_OMP_FOR },
1192 { "master", PRAGMA_OMP_MASTER },
1193 { "ordered", PRAGMA_OMP_ORDERED },
1194 { "parallel", PRAGMA_OMP_PARALLEL },
1195 { "section", PRAGMA_OMP_SECTION },
1196 { "sections", PRAGMA_OMP_SECTIONS },
1197 { "single", PRAGMA_OMP_SINGLE },
1198 { "task", PRAGMA_OMP_TASK },
1199 { "taskwait", PRAGMA_OMP_TASKWAIT },
1200 { "taskyield", PRAGMA_OMP_TASKYIELD },
1201 { "threadprivate", PRAGMA_OMP_THREADPRIVATE }
1202 };
1203
1204 void
c_pp_lookup_pragma(unsigned int id,const char ** space,const char ** name)1205 c_pp_lookup_pragma (unsigned int id, const char **space, const char **name)
1206 {
1207 const int n_omp_pragmas = sizeof (omp_pragmas) / sizeof (*omp_pragmas);
1208 int i;
1209
1210 for (i = 0; i < n_omp_pragmas; ++i)
1211 if (omp_pragmas[i].id == id)
1212 {
1213 *space = "omp";
1214 *name = omp_pragmas[i].name;
1215 return;
1216 }
1217
1218 if (id >= PRAGMA_FIRST_EXTERNAL
1219 && (id < PRAGMA_FIRST_EXTERNAL
1220 + VEC_length (pragma_ns_name, registered_pp_pragmas)))
1221 {
1222 *space = VEC_index (pragma_ns_name, registered_pp_pragmas,
1223 id - PRAGMA_FIRST_EXTERNAL)->space;
1224 *name = VEC_index (pragma_ns_name, registered_pp_pragmas,
1225 id - PRAGMA_FIRST_EXTERNAL)->name;
1226 return;
1227 }
1228
1229 gcc_unreachable ();
1230 }
1231
1232 /* Front-end wrappers for pragma registration to avoid dragging
1233 cpplib.h in almost everywhere. */
1234
1235 static void
c_register_pragma_1(const char * space,const char * name,internal_pragma_handler ihandler,bool allow_expansion)1236 c_register_pragma_1 (const char *space, const char *name,
1237 internal_pragma_handler ihandler, bool allow_expansion)
1238 {
1239 unsigned id;
1240
1241 if (flag_preprocess_only)
1242 {
1243 pragma_ns_name ns_name;
1244
1245 if (!allow_expansion)
1246 return;
1247
1248 ns_name.space = space;
1249 ns_name.name = name;
1250 VEC_safe_push (pragma_ns_name, heap, registered_pp_pragmas, &ns_name);
1251 id = VEC_length (pragma_ns_name, registered_pp_pragmas);
1252 id += PRAGMA_FIRST_EXTERNAL - 1;
1253 }
1254 else
1255 {
1256 VEC_safe_push (internal_pragma_handler, heap, registered_pragmas,
1257 &ihandler);
1258 id = VEC_length (internal_pragma_handler, registered_pragmas);
1259 id += PRAGMA_FIRST_EXTERNAL - 1;
1260
1261 /* The C++ front end allocates 6 bits in cp_token; the C front end
1262 allocates 7 bits in c_token. At present this is sufficient. */
1263 gcc_assert (id < 64);
1264 }
1265
1266 cpp_register_deferred_pragma (parse_in, space, name, id,
1267 allow_expansion, false);
1268 }
1269
1270 /* Register a C pragma handler, using a space and a name. It disallows pragma
1271 expansion (if you want it, use c_register_pragma_with_expansion instead). */
1272 void
c_register_pragma(const char * space,const char * name,pragma_handler_1arg handler)1273 c_register_pragma (const char *space, const char *name,
1274 pragma_handler_1arg handler)
1275 {
1276 internal_pragma_handler ihandler;
1277
1278 ihandler.handler.handler_1arg = handler;
1279 ihandler.extra_data = false;
1280 ihandler.data = NULL;
1281 c_register_pragma_1 (space, name, ihandler, false);
1282 }
1283
1284 /* Register a C pragma handler, using a space and a name, it also carries an
1285 extra data field which can be used by the handler. It disallows pragma
1286 expansion (if you want it, use c_register_pragma_with_expansion_and_data
1287 instead). */
1288 void
c_register_pragma_with_data(const char * space,const char * name,pragma_handler_2arg handler,void * data)1289 c_register_pragma_with_data (const char *space, const char *name,
1290 pragma_handler_2arg handler, void * data)
1291 {
1292 internal_pragma_handler ihandler;
1293
1294 ihandler.handler.handler_2arg = handler;
1295 ihandler.extra_data = true;
1296 ihandler.data = data;
1297 c_register_pragma_1 (space, name, ihandler, false);
1298 }
1299
1300 /* Register a C pragma handler, using a space and a name. It allows pragma
1301 expansion as in the following example:
1302
1303 #define NUMBER 10
1304 #pragma count (NUMBER)
1305
1306 Name expansion is still disallowed. */
1307 void
c_register_pragma_with_expansion(const char * space,const char * name,pragma_handler_1arg handler)1308 c_register_pragma_with_expansion (const char *space, const char *name,
1309 pragma_handler_1arg handler)
1310 {
1311 internal_pragma_handler ihandler;
1312
1313 ihandler.handler.handler_1arg = handler;
1314 ihandler.extra_data = false;
1315 ihandler.data = NULL;
1316 c_register_pragma_1 (space, name, ihandler, true);
1317 }
1318
1319 /* Register a C pragma handler, using a space and a name, it also carries an
1320 extra data field which can be used by the handler. It allows pragma
1321 expansion as in the following example:
1322
1323 #define NUMBER 10
1324 #pragma count (NUMBER)
1325
1326 Name expansion is still disallowed. */
1327 void
c_register_pragma_with_expansion_and_data(const char * space,const char * name,pragma_handler_2arg handler,void * data)1328 c_register_pragma_with_expansion_and_data (const char *space, const char *name,
1329 pragma_handler_2arg handler,
1330 void *data)
1331 {
1332 internal_pragma_handler ihandler;
1333
1334 ihandler.handler.handler_2arg = handler;
1335 ihandler.extra_data = true;
1336 ihandler.data = data;
1337 c_register_pragma_1 (space, name, ihandler, true);
1338 }
1339
1340 void
c_invoke_pragma_handler(unsigned int id)1341 c_invoke_pragma_handler (unsigned int id)
1342 {
1343 internal_pragma_handler *ihandler;
1344 pragma_handler_1arg handler_1arg;
1345 pragma_handler_2arg handler_2arg;
1346
1347 id -= PRAGMA_FIRST_EXTERNAL;
1348 ihandler = VEC_index (internal_pragma_handler, registered_pragmas, id);
1349 if (ihandler->extra_data)
1350 {
1351 handler_2arg = ihandler->handler.handler_2arg;
1352 handler_2arg (parse_in, ihandler->data);
1353 }
1354 else
1355 {
1356 handler_1arg = ihandler->handler.handler_1arg;
1357 handler_1arg (parse_in);
1358 }
1359 }
1360
1361 /* Set up front-end pragmas. */
1362 void
init_pragma(void)1363 init_pragma (void)
1364 {
1365 if (flag_openmp)
1366 {
1367 const int n_omp_pragmas = sizeof (omp_pragmas) / sizeof (*omp_pragmas);
1368 int i;
1369
1370 for (i = 0; i < n_omp_pragmas; ++i)
1371 cpp_register_deferred_pragma (parse_in, "omp", omp_pragmas[i].name,
1372 omp_pragmas[i].id, true, true);
1373 }
1374
1375 if (!flag_preprocess_only)
1376 cpp_register_deferred_pragma (parse_in, "GCC", "pch_preprocess",
1377 PRAGMA_GCC_PCH_PREPROCESS, false, false);
1378
1379 #ifdef HANDLE_PRAGMA_PACK_WITH_EXPANSION
1380 c_register_pragma_with_expansion (0, "pack", handle_pragma_pack);
1381 #else
1382 c_register_pragma (0, "pack", handle_pragma_pack);
1383 #endif
1384 c_register_pragma (0, "weak", handle_pragma_weak);
1385 c_register_pragma ("GCC", "visibility", handle_pragma_visibility);
1386
1387 c_register_pragma ("GCC", "diagnostic", handle_pragma_diagnostic);
1388 c_register_pragma ("GCC", "target", handle_pragma_target);
1389 c_register_pragma ("GCC", "optimize", handle_pragma_optimize);
1390 c_register_pragma ("GCC", "push_options", handle_pragma_push_options);
1391 c_register_pragma ("GCC", "pop_options", handle_pragma_pop_options);
1392 c_register_pragma ("GCC", "reset_options", handle_pragma_reset_options);
1393
1394 c_register_pragma ("STDC", "FLOAT_CONST_DECIMAL64",
1395 handle_pragma_float_const_decimal64);
1396
1397 c_register_pragma_with_expansion (0, "redefine_extname",
1398 handle_pragma_redefine_extname);
1399 c_register_pragma (0, "extern_prefix", handle_pragma_extern_prefix);
1400
1401 c_register_pragma_with_expansion (0, "message", handle_pragma_message);
1402
1403 #ifdef REGISTER_TARGET_PRAGMAS
1404 REGISTER_TARGET_PRAGMAS ();
1405 #endif
1406
1407 /* Allow plugins to register their own pragmas. */
1408 invoke_plugin_callbacks (PLUGIN_PRAGMAS, NULL);
1409 }
1410
1411 #include "gt-c-family-c-pragma.h"
1412