Merge branch 'vendor/GCC44'
[dragonfly.git] / contrib / gcc-4.4 / gcc / c-pragma.c
CommitLineData
c251ad9e
SS
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 Free Software Foundation, Inc.
4
5This file is part of GCC.
6
7GCC is free software; you can redistribute it and/or modify it under
8the terms of the GNU General Public License as published by the Free
9Software Foundation; either version 3, or (at your option) any later
10version.
11
12GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13WARRANTY; without even the implied warranty of MERCHANTABILITY or
14FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15for more details.
16
17You should have received a copy of the GNU General Public License
18along 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 "rtl.h"
26#include "tree.h"
27#include "function.h"
28#include "cpplib.h"
29#include "c-pragma.h"
30#include "flags.h"
31#include "toplev.h"
32#include "ggc.h"
33#include "c-common.h"
34#include "output.h"
35#include "tm_p.h"
36#include "vec.h"
37#include "target.h"
38#include "diagnostic.h"
39#include "opts.h"
40
41#define GCC_BAD(gmsgid) \
42 do { warning (OPT_Wpragmas, gmsgid); return; } while (0)
43#define GCC_BAD2(gmsgid, arg) \
44 do { warning (OPT_Wpragmas, gmsgid, arg); return; } while (0)
45
46typedef struct align_stack GTY(())
47{
48 int alignment;
49 tree id;
50 struct align_stack * prev;
51} align_stack;
52
53static GTY(()) struct align_stack * alignment_stack;
54
55#ifdef HANDLE_PRAGMA_PACK
56static void handle_pragma_pack (cpp_reader *);
57
58#ifdef HANDLE_PRAGMA_PACK_PUSH_POP
59/* If we have a "global" #pragma pack(<n>) in effect when the first
60 #pragma pack(push,<n>) is encountered, this stores the value of
61 maximum_field_alignment in effect. When the final pop_alignment()
62 happens, we restore the value to this, not to a value of 0 for
63 maximum_field_alignment. Value is in bits. */
64static int default_alignment;
65#define SET_GLOBAL_ALIGNMENT(ALIGN) (maximum_field_alignment = *(alignment_stack == NULL \
66 ? &default_alignment \
67 : &alignment_stack->alignment) = (ALIGN))
68
69static void push_alignment (int, tree);
70static void pop_alignment (tree);
71
72/* Push an alignment value onto the stack. */
73static void
74push_alignment (int alignment, tree id)
75{
76 align_stack * entry;
77
78 entry = GGC_NEW (align_stack);
79
80 entry->alignment = alignment;
81 entry->id = id;
82 entry->prev = alignment_stack;
83
84 /* The current value of maximum_field_alignment is not necessarily
85 0 since there may be a #pragma pack(<n>) in effect; remember it
86 so that we can restore it after the final #pragma pop(). */
87 if (alignment_stack == NULL)
88 default_alignment = maximum_field_alignment;
89
90 alignment_stack = entry;
91
92 maximum_field_alignment = alignment;
93}
94
95/* Undo a push of an alignment onto the stack. */
96static void
97pop_alignment (tree id)
98{
99 align_stack * entry;
100
101 if (alignment_stack == NULL)
102 GCC_BAD ("#pragma pack (pop) encountered without matching #pragma pack (push)");
103
104 /* If we got an identifier, strip away everything above the target
105 entry so that the next step will restore the state just below it. */
106 if (id)
107 {
108 for (entry = alignment_stack; entry; entry = entry->prev)
109 if (entry->id == id)
110 {
111 alignment_stack = entry;
112 break;
113 }
114 if (entry == NULL)
115 warning (OPT_Wpragmas, "\
116#pragma pack(pop, %s) encountered without matching #pragma pack(push, %s)"
117 , IDENTIFIER_POINTER (id), IDENTIFIER_POINTER (id));
118 }
119
120 entry = alignment_stack->prev;
121
122 maximum_field_alignment = entry ? entry->alignment : default_alignment;
123
124 alignment_stack = entry;
125}
126#else /* not HANDLE_PRAGMA_PACK_PUSH_POP */
127#define SET_GLOBAL_ALIGNMENT(ALIGN) (maximum_field_alignment = (ALIGN))
128#define push_alignment(ID, N) \
129 GCC_BAD ("#pragma pack(push[, id], <n>) is not supported on this target")
130#define pop_alignment(ID) \
131 GCC_BAD ("#pragma pack(pop[, id], <n>) is not supported on this target")
132#endif /* HANDLE_PRAGMA_PACK_PUSH_POP */
133
134/* #pragma pack ()
135 #pragma pack (N)
136
137 #pragma pack (push)
138 #pragma pack (push, N)
139 #pragma pack (push, ID)
140 #pragma pack (push, ID, N)
141 #pragma pack (pop)
142 #pragma pack (pop, ID) */
143static void
144handle_pragma_pack (cpp_reader * ARG_UNUSED (dummy))
145{
146 tree x, id = 0;
147 int align = -1;
148 enum cpp_ttype token;
149 enum { set, push, pop } action;
150
151 if (pragma_lex (&x) != CPP_OPEN_PAREN)
152 GCC_BAD ("missing %<(%> after %<#pragma pack%> - ignored");
153
154 token = pragma_lex (&x);
155 if (token == CPP_CLOSE_PAREN)
156 {
157 action = set;
158 align = initial_max_fld_align;
159 }
160 else if (token == CPP_NUMBER)
161 {
162 if (TREE_CODE (x) != INTEGER_CST)
163 GCC_BAD ("invalid constant in %<#pragma pack%> - ignored");
164 align = TREE_INT_CST_LOW (x);
165 action = set;
166 if (pragma_lex (&x) != CPP_CLOSE_PAREN)
167 GCC_BAD ("malformed %<#pragma pack%> - ignored");
168 }
169 else if (token == CPP_NAME)
170 {
171#define GCC_BAD_ACTION do { if (action != pop) \
172 GCC_BAD ("malformed %<#pragma pack(push[, id][, <n>])%> - ignored"); \
173 else \
174 GCC_BAD ("malformed %<#pragma pack(pop[, id])%> - ignored"); \
175 } while (0)
176
177 const char *op = IDENTIFIER_POINTER (x);
178 if (!strcmp (op, "push"))
179 action = push;
180 else if (!strcmp (op, "pop"))
181 action = pop;
182 else
183 GCC_BAD2 ("unknown action %qs for %<#pragma pack%> - ignored", op);
184
185 while ((token = pragma_lex (&x)) == CPP_COMMA)
186 {
187 token = pragma_lex (&x);
188 if (token == CPP_NAME && id == 0)
189 {
190 id = x;
191 }
192 else if (token == CPP_NUMBER && action == push && align == -1)
193 {
194 if (TREE_CODE (x) != INTEGER_CST)
195 GCC_BAD ("invalid constant in %<#pragma pack%> - ignored");
196 align = TREE_INT_CST_LOW (x);
197 if (align == -1)
198 action = set;
199 }
200 else
201 GCC_BAD_ACTION;
202 }
203
204 if (token != CPP_CLOSE_PAREN)
205 GCC_BAD_ACTION;
206#undef GCC_BAD_ACTION
207 }
208 else
209 GCC_BAD ("malformed %<#pragma pack%> - ignored");
210
211 if (pragma_lex (&x) != CPP_EOF)
212 warning (OPT_Wpragmas, "junk at end of %<#pragma pack%>");
213
214 if (flag_pack_struct)
215 GCC_BAD ("#pragma pack has no effect with -fpack-struct - ignored");
216
217 if (action != pop)
218 switch (align)
219 {
220 case 0:
221 case 1:
222 case 2:
223 case 4:
224 case 8:
225 case 16:
226 align *= BITS_PER_UNIT;
227 break;
228 case -1:
229 if (action == push)
230 {
231 align = maximum_field_alignment;
232 break;
233 }
234 default:
235 GCC_BAD2 ("alignment must be a small power of two, not %d", align);
236 }
237
238 switch (action)
239 {
240 case set: SET_GLOBAL_ALIGNMENT (align); break;
241 case push: push_alignment (align, id); break;
242 case pop: pop_alignment (id); break;
243 }
244}
245#endif /* HANDLE_PRAGMA_PACK */
246
c251ad9e
SS
247static GTY(()) tree pending_weaks;
248
249#ifdef HANDLE_PRAGMA_WEAK
250static void apply_pragma_weak (tree, tree);
251static void handle_pragma_weak (cpp_reader *);
252
253static void
254apply_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 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
268 warning (OPT_Wpragmas, "applying #pragma weak %q+D after first use "
269 "results in unspecified behavior", decl);
270
271 declare_weak (decl);
272}
273
274void
275maybe_apply_pragma_weak (tree decl)
276{
277 tree *p, t, id;
278
279 /* Avoid asking for DECL_ASSEMBLER_NAME when it's not needed. */
280
281 /* No weak symbols pending, take the short-cut. */
282 if (!pending_weaks)
283 return;
284 /* If it's not visible outside this file, it doesn't matter whether
285 it's weak. */
286 if (!DECL_EXTERNAL (decl) && !TREE_PUBLIC (decl))
287 return;
288 /* If it's not a function or a variable, it can't be weak.
289 FIXME: what kinds of things are visible outside this file but
290 aren't functions or variables? Should this be an assert instead? */
291 if (TREE_CODE (decl) != FUNCTION_DECL && TREE_CODE (decl) != VAR_DECL)
292 return;
293
294 id = DECL_ASSEMBLER_NAME (decl);
295
296 for (p = &pending_weaks; (t = *p) ; p = &TREE_CHAIN (t))
297 if (id == TREE_PURPOSE (t))
298 {
299 apply_pragma_weak (decl, TREE_VALUE (t));
300 *p = TREE_CHAIN (t);
301 break;
302 }
303}
304
305/* Process all "#pragma weak A = B" directives where we have not seen
306 a decl for A. */
307void
308maybe_apply_pending_pragma_weaks (void)
309{
310 tree *p, t, alias_id, id, decl, *next;
311
312 for (p = &pending_weaks; (t = *p) ; p = next)
313 {
314 next = &TREE_CHAIN (t);
315 alias_id = TREE_PURPOSE (t);
316 id = TREE_VALUE (t);
317
318 if (TREE_VALUE (t) == NULL)
319 continue;
320
321 decl = build_decl (FUNCTION_DECL, alias_id, default_function_type);
322
323 DECL_ARTIFICIAL (decl) = 1;
324 TREE_PUBLIC (decl) = 1;
325 DECL_EXTERNAL (decl) = 1;
326 DECL_WEAK (decl) = 1;
327
328 assemble_alias (decl, id);
329 }
330}
331
332/* #pragma weak name [= value] */
333static void
334handle_pragma_weak (cpp_reader * ARG_UNUSED (dummy))
335{
336 tree name, value, x, decl;
337 enum cpp_ttype t;
338
339 value = 0;
340
341 if (pragma_lex (&name) != CPP_NAME)
342 GCC_BAD ("malformed #pragma weak, ignored");
343 t = pragma_lex (&x);
344 if (t == CPP_EQ)
345 {
346 if (pragma_lex (&value) != CPP_NAME)
347 GCC_BAD ("malformed #pragma weak, ignored");
348 t = pragma_lex (&x);
349 }
350 if (t != CPP_EOF)
351 warning (OPT_Wpragmas, "junk at end of %<#pragma weak%>");
352
353 decl = identifier_global_value (name);
354 if (decl && DECL_P (decl))
355 {
356 apply_pragma_weak (decl, value);
357 if (value)
358 assemble_alias (decl, value);
359 }
360 else
361 pending_weaks = tree_cons (name, value, pending_weaks);
362}
363#else
364void
365maybe_apply_pragma_weak (tree ARG_UNUSED (decl))
366{
367}
368
369void
370maybe_apply_pending_pragma_weaks (void)
371{
372}
373#endif /* HANDLE_PRAGMA_WEAK */
374
375/* GCC supports two #pragma directives for renaming the external
376 symbol associated with a declaration (DECL_ASSEMBLER_NAME), for
377 compatibility with the Solaris and Tru64 system headers. GCC also
378 has its own notation for this, __asm__("name") annotations.
379
380 Corner cases of these features and their interaction:
381
382 1) Both pragmas silently apply only to declarations with external
383 linkage (that is, TREE_PUBLIC || DECL_EXTERNAL). Asm labels
384 do not have this restriction.
385
386 2) In C++, both #pragmas silently apply only to extern "C" declarations.
387 Asm labels do not have this restriction.
388
389 3) If any of the three ways of changing DECL_ASSEMBLER_NAME is
390 applied to a decl whose DECL_ASSEMBLER_NAME is already set, and the
391 new name is different, a warning issues and the name does not change.
392
393 4) The "source name" for #pragma redefine_extname is the DECL_NAME,
394 *not* the DECL_ASSEMBLER_NAME.
395
396 5) If #pragma extern_prefix is in effect and a declaration occurs
397 with an __asm__ name, the #pragma extern_prefix is silently
398 ignored for that declaration.
399
400 6) If #pragma extern_prefix and #pragma redefine_extname apply to
401 the same declaration, whichever triggered first wins, and a warning
402 is issued. (We would like to have #pragma redefine_extname always
403 win, but it can appear either before or after the declaration, and
404 if it appears afterward, we have no way of knowing whether a modified
405 DECL_ASSEMBLER_NAME is due to #pragma extern_prefix.) */
406
407static GTY(()) tree pending_redefine_extname;
408
409static void handle_pragma_redefine_extname (cpp_reader *);
410
411/* #pragma redefine_extname oldname newname */
412static void
413handle_pragma_redefine_extname (cpp_reader * ARG_UNUSED (dummy))
414{
415 tree oldname, newname, decl, x;
416 enum cpp_ttype t;
417
418 if (pragma_lex (&oldname) != CPP_NAME)
419 GCC_BAD ("malformed #pragma redefine_extname, ignored");
420 if (pragma_lex (&newname) != CPP_NAME)
421 GCC_BAD ("malformed #pragma redefine_extname, ignored");
422 t = pragma_lex (&x);
423 if (t != CPP_EOF)
424 warning (OPT_Wpragmas, "junk at end of %<#pragma redefine_extname%>");
425
426 if (!flag_mudflap && !targetm.handle_pragma_redefine_extname)
427 {
428 if (warn_unknown_pragmas > in_system_header)
429 warning (OPT_Wunknown_pragmas,
430 "#pragma redefine_extname not supported on this target");
431 return;
432 }
433
434 decl = identifier_global_value (oldname);
435 if (decl
436 && (TREE_PUBLIC (decl) || DECL_EXTERNAL (decl))
437 && (TREE_CODE (decl) == FUNCTION_DECL
438 || TREE_CODE (decl) == VAR_DECL)
439 && has_c_linkage (decl))
440 {
441 if (DECL_ASSEMBLER_NAME_SET_P (decl))
442 {
443 const char *name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
444 name = targetm.strip_name_encoding (name);
445
446 if (strcmp (name, IDENTIFIER_POINTER (newname)))
447 warning (OPT_Wpragmas, "#pragma redefine_extname ignored due to "
448 "conflict with previous rename");
449 }
450 else
451 change_decl_assembler_name (decl, newname);
452 }
453 else
454 /* We have to add this to the rename list even if there's already
455 a global value that doesn't meet the above criteria, because in
456 C++ "struct foo {...};" puts "foo" in the current namespace but
457 does *not* conflict with a subsequent declaration of a function
458 or variable foo. See g++.dg/other/pragma-re-2.C. */
459 add_to_renaming_pragma_list (oldname, newname);
460}
461
462/* This is called from here and from ia64.c. */
463void
464add_to_renaming_pragma_list (tree oldname, tree newname)
465{
466 tree previous = purpose_member (oldname, pending_redefine_extname);
467 if (previous)
468 {
469 if (TREE_VALUE (previous) != newname)
470 warning (OPT_Wpragmas, "#pragma redefine_extname ignored due to "
471 "conflict with previous #pragma redefine_extname");
472 return;
473 }
474
475 pending_redefine_extname
476 = tree_cons (oldname, newname, pending_redefine_extname);
477}
478
479static GTY(()) tree pragma_extern_prefix;
480
481/* #pragma extern_prefix "prefix" */
482static void
483handle_pragma_extern_prefix (cpp_reader * ARG_UNUSED (dummy))
484{
485 tree prefix, x;
486 enum cpp_ttype t;
487
488 if (pragma_lex (&prefix) != CPP_STRING)
489 GCC_BAD ("malformed #pragma extern_prefix, ignored");
490 t = pragma_lex (&x);
491 if (t != CPP_EOF)
492 warning (OPT_Wpragmas, "junk at end of %<#pragma extern_prefix%>");
493
494 if (targetm.handle_pragma_extern_prefix)
495 /* Note that the length includes the null terminator. */
496 pragma_extern_prefix = (TREE_STRING_LENGTH (prefix) > 1 ? prefix : NULL);
497 else if (warn_unknown_pragmas > in_system_header)
498 warning (OPT_Wunknown_pragmas,
499 "#pragma extern_prefix not supported on this target");
500}
501
502/* Hook from the front ends to apply the results of one of the preceding
503 pragmas that rename variables. */
504
505tree
506maybe_apply_renaming_pragma (tree decl, tree asmname)
507{
508 tree *p, t;
509
510 /* The renaming pragmas are only applied to declarations with
511 external linkage. */
512 if ((TREE_CODE (decl) != FUNCTION_DECL && TREE_CODE (decl) != VAR_DECL)
513 || (!TREE_PUBLIC (decl) && !DECL_EXTERNAL (decl))
514 || !has_c_linkage (decl))
515 return asmname;
516
517 /* If the DECL_ASSEMBLER_NAME is already set, it does not change,
518 but we may warn about a rename that conflicts. */
519 if (DECL_ASSEMBLER_NAME_SET_P (decl))
520 {
521 const char *oldname = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
522 oldname = targetm.strip_name_encoding (oldname);
523
524 if (asmname && strcmp (TREE_STRING_POINTER (asmname), oldname))
525 warning (OPT_Wpragmas, "asm declaration ignored due to "
526 "conflict with previous rename");
527
528 /* Take any pending redefine_extname off the list. */
529 for (p = &pending_redefine_extname; (t = *p); p = &TREE_CHAIN (t))
530 if (DECL_NAME (decl) == TREE_PURPOSE (t))
531 {
532 /* Only warn if there is a conflict. */
533 if (strcmp (IDENTIFIER_POINTER (TREE_VALUE (t)), oldname))
534 warning (OPT_Wpragmas, "#pragma redefine_extname ignored due to "
535 "conflict with previous rename");
536
537 *p = TREE_CHAIN (t);
538 break;
539 }
540 return 0;
541 }
542
543 /* Find out if we have a pending #pragma redefine_extname. */
544 for (p = &pending_redefine_extname; (t = *p); p = &TREE_CHAIN (t))
545 if (DECL_NAME (decl) == TREE_PURPOSE (t))
546 {
547 tree newname = TREE_VALUE (t);
548 *p = TREE_CHAIN (t);
549
550 /* If we already have an asmname, #pragma redefine_extname is
551 ignored (with a warning if it conflicts). */
552 if (asmname)
553 {
554 if (strcmp (TREE_STRING_POINTER (asmname),
555 IDENTIFIER_POINTER (newname)) != 0)
556 warning (OPT_Wpragmas, "#pragma redefine_extname ignored due to "
557 "conflict with __asm__ declaration");
558 return asmname;
559 }
560
561 /* Otherwise we use what we've got; #pragma extern_prefix is
562 silently ignored. */
563 return build_string (IDENTIFIER_LENGTH (newname),
564 IDENTIFIER_POINTER (newname));
565 }
566
567 /* If we've got an asmname, #pragma extern_prefix is silently ignored. */
568 if (asmname)
569 return asmname;
570
571 /* If #pragma extern_prefix is in effect, apply it. */
572 if (pragma_extern_prefix)
573 {
574 const char *prefix = TREE_STRING_POINTER (pragma_extern_prefix);
575 size_t plen = TREE_STRING_LENGTH (pragma_extern_prefix) - 1;
576
577 const char *id = IDENTIFIER_POINTER (DECL_NAME (decl));
578 size_t ilen = IDENTIFIER_LENGTH (DECL_NAME (decl));
579
580 char *newname = (char *) alloca (plen + ilen + 1);
581
582 memcpy (newname, prefix, plen);
583 memcpy (newname + plen, id, ilen + 1);
584
585 return build_string (plen + ilen, newname);
586 }
587
588 /* Nada. */
589 return 0;
590}
591
592
593#ifdef HANDLE_PRAGMA_VISIBILITY
594static void handle_pragma_visibility (cpp_reader *);
595
596typedef enum symbol_visibility visibility;
597DEF_VEC_I (visibility);
598DEF_VEC_ALLOC_I (visibility, heap);
599static VEC (visibility, heap) *visstack;
600
601/* Push the visibility indicated by STR onto the top of the #pragma
602 visibility stack. */
603
604void
605push_visibility (const char *str)
606{
607 VEC_safe_push (visibility, heap, visstack,
608 default_visibility);
609 if (!strcmp (str, "default"))
610 default_visibility = VISIBILITY_DEFAULT;
611 else if (!strcmp (str, "internal"))
612 default_visibility = VISIBILITY_INTERNAL;
613 else if (!strcmp (str, "hidden"))
614 default_visibility = VISIBILITY_HIDDEN;
615 else if (!strcmp (str, "protected"))
616 default_visibility = VISIBILITY_PROTECTED;
617 else
618 GCC_BAD ("#pragma GCC visibility push() must specify default, internal, hidden or protected");
619 visibility_options.inpragma = 1;
620}
621
622/* Pop a level of the #pragma visibility stack. */
623
624void
625pop_visibility (void)
626{
627 default_visibility = VEC_pop (visibility, visstack);
628 visibility_options.inpragma
629 = VEC_length (visibility, visstack) != 0;
630}
631
632/* Sets the default visibility for symbols to something other than that
633 specified on the command line. */
634
635static void
636handle_pragma_visibility (cpp_reader *dummy ATTRIBUTE_UNUSED)
637{
638 /* Form is #pragma GCC visibility push(hidden)|pop */
639 tree x;
640 enum cpp_ttype token;
641 enum { bad, push, pop } action = bad;
642
643 token = pragma_lex (&x);
644 if (token == CPP_NAME)
645 {
646 const char *op = IDENTIFIER_POINTER (x);
647 if (!strcmp (op, "push"))
648 action = push;
649 else if (!strcmp (op, "pop"))
650 action = pop;
651 }
652 if (bad == action)
653 GCC_BAD ("#pragma GCC visibility must be followed by push or pop");
654 else
655 {
656 if (pop == action)
657 {
658 if (!VEC_length (visibility, visstack))
659 GCC_BAD ("no matching push for %<#pragma GCC visibility pop%>");
660 else
661 pop_visibility ();
662 }
663 else
664 {
665 if (pragma_lex (&x) != CPP_OPEN_PAREN)
666 GCC_BAD ("missing %<(%> after %<#pragma GCC visibility push%> - ignored");
667 token = pragma_lex (&x);
668 if (token != CPP_NAME)
669 GCC_BAD ("malformed #pragma GCC visibility push");
670 else
671 push_visibility (IDENTIFIER_POINTER (x));
672 if (pragma_lex (&x) != CPP_CLOSE_PAREN)
673 GCC_BAD ("missing %<(%> after %<#pragma GCC visibility push%> - ignored");
674 }
675 }
676 if (pragma_lex (&x) != CPP_EOF)
677 warning (OPT_Wpragmas, "junk at end of %<#pragma GCC visibility%>");
678}
679
680#endif
681
682static void
683handle_pragma_diagnostic(cpp_reader *ARG_UNUSED(dummy))
684{
685 const char *kind_string, *option_string;
686 unsigned int option_index;
687 enum cpp_ttype token;
688 diagnostic_t kind;
689 tree x;
690
691 if (cfun)
692 {
693 error ("#pragma GCC diagnostic not allowed inside functions");
694 return;
695 }
696
697 token = pragma_lex (&x);
698 if (token != CPP_NAME)
699 GCC_BAD ("missing [error|warning|ignored] after %<#pragma GCC diagnostic%>");
700 kind_string = IDENTIFIER_POINTER (x);
701 if (strcmp (kind_string, "error") == 0)
702 kind = DK_ERROR;
703 else if (strcmp (kind_string, "warning") == 0)
704 kind = DK_WARNING;
705 else if (strcmp (kind_string, "ignored") == 0)
706 kind = DK_IGNORED;
707 else
708 GCC_BAD ("expected [error|warning|ignored] after %<#pragma GCC diagnostic%>");
709
710 token = pragma_lex (&x);
711 if (token != CPP_STRING)
712 GCC_BAD ("missing option after %<#pragma GCC diagnostic%> kind");
713 option_string = TREE_STRING_POINTER (x);
714 for (option_index = 0; option_index < cl_options_count; option_index++)
715 if (strcmp (cl_options[option_index].opt_text, option_string) == 0)
716 {
717 /* This overrides -Werror, for example. */
718 diagnostic_classify_diagnostic (global_dc, option_index, kind);
719 /* This makes sure the option is enabled, like -Wfoo would do. */
720 if (cl_options[option_index].var_type == CLVC_BOOLEAN
721 && cl_options[option_index].flag_var
722 && kind != DK_IGNORED)
723 *(int *) cl_options[option_index].flag_var = 1;
724 return;
725 }
726 GCC_BAD ("unknown option after %<#pragma GCC diagnostic%> kind");
727}
728
729/* Parse #pragma GCC target (xxx) to set target specific options. */
730static void
731handle_pragma_target(cpp_reader *ARG_UNUSED(dummy))
732{
733 enum cpp_ttype token;
734 tree x;
735 bool close_paren_needed_p = false;
736
737 if (cfun)
738 {
739 error ("#pragma GCC option is not allowed inside functions");
740 return;
741 }
742
743 token = pragma_lex (&x);
744 if (token == CPP_OPEN_PAREN)
745 {
746 close_paren_needed_p = true;
747 token = pragma_lex (&x);
748 }
749
750 if (token != CPP_STRING)
751 {
752 GCC_BAD ("%<#pragma GCC option%> is not a string");
753 return;
754 }
755
756 /* Strings are user options. */
757 else
758 {
759 tree args = NULL_TREE;
760
761 do
762 {
763 /* Build up the strings now as a tree linked list. Skip empty
764 strings. */
765 if (TREE_STRING_LENGTH (x) > 0)
766 args = tree_cons (NULL_TREE, x, args);
767
768 token = pragma_lex (&x);
769 while (token == CPP_COMMA)
770 token = pragma_lex (&x);
771 }
772 while (token == CPP_STRING);
773
774 if (close_paren_needed_p)
775 {
776 if (token == CPP_CLOSE_PAREN)
777 token = pragma_lex (&x);
778 else
779 GCC_BAD ("%<#pragma GCC target (string [,string]...)%> does "
780 "not have a final %<)%>.");
781 }
782
783 if (token != CPP_EOF)
784 {
785 error ("#pragma GCC target string... is badly formed");
786 return;
787 }
788
789 /* put arguments in the order the user typed them. */
790 args = nreverse (args);
791
792 if (targetm.target_option.pragma_parse (args, NULL_TREE))
793 current_target_pragma = args;
794 }
795}
796
797/* Handle #pragma GCC optimize to set optimization options. */
798static void
799handle_pragma_optimize (cpp_reader *ARG_UNUSED(dummy))
800{
801 enum cpp_ttype token;
802 tree x;
803 bool close_paren_needed_p = false;
804 tree optimization_previous_node = optimization_current_node;
805
806 if (cfun)
807 {
808 error ("#pragma GCC optimize is not allowed inside functions");
809 return;
810 }
811
812 token = pragma_lex (&x);
813 if (token == CPP_OPEN_PAREN)
814 {
815 close_paren_needed_p = true;
816 token = pragma_lex (&x);
817 }
818
819 if (token != CPP_STRING && token != CPP_NUMBER)
820 {
821 GCC_BAD ("%<#pragma GCC optimize%> is not a string or number");
822 return;
823 }
824
825 /* Strings/numbers are user options. */
826 else
827 {
828 tree args = NULL_TREE;
829
830 do
831 {
832 /* Build up the numbers/strings now as a list. */
833 if (token != CPP_STRING || TREE_STRING_LENGTH (x) > 0)
834 args = tree_cons (NULL_TREE, x, args);
835
836 token = pragma_lex (&x);
837 while (token == CPP_COMMA)
838 token = pragma_lex (&x);
839 }
840 while (token == CPP_STRING || token == CPP_NUMBER);
841
842 if (close_paren_needed_p)
843 {
844 if (token == CPP_CLOSE_PAREN)
845 token = pragma_lex (&x);
846 else
847 GCC_BAD ("%<#pragma GCC optimize (string [,string]...)%> does "
848 "not have a final %<)%>.");
849 }
850
851 if (token != CPP_EOF)
852 {
853 error ("#pragma GCC optimize string... is badly formed");
854 return;
855 }
856
857 /* put arguments in the order the user typed them. */
858 args = nreverse (args);
859
860 parse_optimize_options (args, false);
861 current_optimize_pragma = chainon (current_optimize_pragma, args);
862 optimization_current_node = build_optimization_node ();
863 c_cpp_builtins_optimize_pragma (parse_in,
864 optimization_previous_node,
865 optimization_current_node);
866 }
867}
868
869/* Stack of the #pragma GCC options created with #pragma GCC push_option. Save
870 both the binary representation of the options and the TREE_LIST of
871 strings that will be added to the function's attribute list. */
872typedef struct opt_stack GTY(())
873{
874 struct opt_stack *prev;
875 tree target_binary;
876 tree target_strings;
877 tree optimize_binary;
878 tree optimize_strings;
879} opt_stack;
880
881static GTY(()) struct opt_stack * options_stack;
882
883/* Handle #pragma GCC push_options to save the current target and optimization
884 options. */
885
886static void
887handle_pragma_push_options (cpp_reader *ARG_UNUSED(dummy))
888{
889 enum cpp_ttype token;
890 tree x = 0;
891 opt_stack *p;
892
893 token = pragma_lex (&x);
894 if (token != CPP_EOF)
895 {
896 warning (OPT_Wpragmas, "junk at end of %<#pragma push_options%>");
897 return;
898 }
899
900 p = GGC_NEW (opt_stack);
901 p->prev = options_stack;
902 options_stack = p;
903
904 /* Save optimization and target flags in binary format. */
905 p->optimize_binary = build_optimization_node ();
906 p->target_binary = build_target_option_node ();
907
908 /* Save optimization and target flags in string list format. */
909 p->optimize_strings = copy_list (current_optimize_pragma);
910 p->target_strings = copy_list (current_target_pragma);
911}
912
913/* Handle #pragma GCC pop_options to restore the current target and
914 optimization options from a previous push_options. */
915
916static void
917handle_pragma_pop_options (cpp_reader *ARG_UNUSED(dummy))
918{
919 enum cpp_ttype token;
920 tree x = 0;
921 opt_stack *p;
922
923 token = pragma_lex (&x);
924 if (token != CPP_EOF)
925 {
926 warning (OPT_Wpragmas, "junk at end of %<#pragma pop_options%>");
927 return;
928 }
929
930 if (! options_stack)
931 {
932 warning (OPT_Wpragmas,
933 "%<#pragma GCC pop_options%> without a corresponding "
934 "%<#pragma GCC push_options%>");
935 return;
936 }
937
938 p = options_stack;
939 options_stack = p->prev;
940
941 if (p->target_binary != target_option_current_node)
942 {
943 (void) targetm.target_option.pragma_parse (NULL_TREE, p->target_binary);
944 target_option_current_node = p->target_binary;
945 }
946
947 if (p->optimize_binary != optimization_current_node)
948 {
949 tree old_optimize = optimization_current_node;
950 cl_optimization_restore (TREE_OPTIMIZATION (p->optimize_binary));
951 c_cpp_builtins_optimize_pragma (parse_in, old_optimize,
952 p->optimize_binary);
953 optimization_current_node = p->optimize_binary;
954 }
955
956 current_target_pragma = p->target_strings;
957 current_optimize_pragma = p->optimize_strings;
958}
959
960/* Handle #pragma GCC reset_options to restore the current target and
961 optimization options to the original options used on the command line. */
962
963static void
964handle_pragma_reset_options (cpp_reader *ARG_UNUSED(dummy))
965{
966 enum cpp_ttype token;
967 tree x = 0;
968 tree new_optimize = optimization_default_node;
969 tree new_target = target_option_default_node;
970
971 token = pragma_lex (&x);
972 if (token != CPP_EOF)
973 {
974 warning (OPT_Wpragmas, "junk at end of %<#pragma reset_options%>");
975 return;
976 }
977
978 if (new_target != target_option_current_node)
979 {
980 (void) targetm.target_option.pragma_parse (NULL_TREE, new_target);
981 target_option_current_node = new_target;
982 }
983
984 if (new_optimize != optimization_current_node)
985 {
986 tree old_optimize = optimization_current_node;
987 cl_optimization_restore (TREE_OPTIMIZATION (new_optimize));
988 c_cpp_builtins_optimize_pragma (parse_in, old_optimize, new_optimize);
989 optimization_current_node = new_optimize;
990 }
991
992 current_target_pragma = NULL_TREE;
993 current_optimize_pragma = NULL_TREE;
994}
995
996/* Print a plain user-specified message. */
997
998static void
999handle_pragma_message (cpp_reader *ARG_UNUSED(dummy))
1000{
1001 enum cpp_ttype token;
1002 tree x, message = 0;
1003
1004 token = pragma_lex (&x);
1005 if (token == CPP_OPEN_PAREN)
1006 {
1007 token = pragma_lex (&x);
1008 if (token == CPP_STRING)
1009 message = x;
1010 else
1011 GCC_BAD ("expected a string after %<#pragma message%>");
1012 if (pragma_lex (&x) != CPP_CLOSE_PAREN)
1013 GCC_BAD ("malformed %<#pragma message%>, ignored");
1014 }
1015 else if (token == CPP_STRING)
1016 message = x;
1017 else
1018 GCC_BAD ("expected a string after %<#pragma message%>");
1019
1020 gcc_assert (message);
1021
1022 if (pragma_lex (&x) != CPP_EOF)
1023 warning (OPT_Wpragmas, "junk at end of %<#pragma message%>");
1024
1025 if (TREE_STRING_LENGTH (message) > 1)
1026 inform (input_location, "#pragma message: %s", TREE_STRING_POINTER (message));
1027}
1028
1029/* A vector of registered pragma callbacks. */
1030
1031DEF_VEC_O (pragma_handler);
1032DEF_VEC_ALLOC_O (pragma_handler, heap);
1033
1034static VEC(pragma_handler, heap) *registered_pragmas;
1035
1036typedef struct
1037{
1038 const char *space;
1039 const char *name;
1040} pragma_ns_name;
1041
1042DEF_VEC_O (pragma_ns_name);
1043DEF_VEC_ALLOC_O (pragma_ns_name, heap);
1044
1045static VEC(pragma_ns_name, heap) *registered_pp_pragmas;
1046
1047struct omp_pragma_def { const char *name; unsigned int id; };
1048static const struct omp_pragma_def omp_pragmas[] = {
1049 { "atomic", PRAGMA_OMP_ATOMIC },
1050 { "barrier", PRAGMA_OMP_BARRIER },
1051 { "critical", PRAGMA_OMP_CRITICAL },
1052 { "flush", PRAGMA_OMP_FLUSH },
1053 { "for", PRAGMA_OMP_FOR },
1054 { "master", PRAGMA_OMP_MASTER },
1055 { "ordered", PRAGMA_OMP_ORDERED },
1056 { "parallel", PRAGMA_OMP_PARALLEL },
1057 { "section", PRAGMA_OMP_SECTION },
1058 { "sections", PRAGMA_OMP_SECTIONS },
1059 { "single", PRAGMA_OMP_SINGLE },
1060 { "task", PRAGMA_OMP_TASK },
1061 { "taskwait", PRAGMA_OMP_TASKWAIT },
1062 { "threadprivate", PRAGMA_OMP_THREADPRIVATE }
1063};
1064
1065void
1066c_pp_lookup_pragma (unsigned int id, const char **space, const char **name)
1067{
1068 const int n_omp_pragmas = sizeof (omp_pragmas) / sizeof (*omp_pragmas);
1069 int i;
1070
1071 for (i = 0; i < n_omp_pragmas; ++i)
1072 if (omp_pragmas[i].id == id)
1073 {
1074 *space = "omp";
1075 *name = omp_pragmas[i].name;
1076 return;
1077 }
1078
1079 if (id >= PRAGMA_FIRST_EXTERNAL
1080 && (id < PRAGMA_FIRST_EXTERNAL
1081 + VEC_length (pragma_ns_name, registered_pp_pragmas)))
1082 {
1083 *space = VEC_index (pragma_ns_name, registered_pp_pragmas,
1084 id - PRAGMA_FIRST_EXTERNAL)->space;
1085 *name = VEC_index (pragma_ns_name, registered_pp_pragmas,
1086 id - PRAGMA_FIRST_EXTERNAL)->name;
1087 return;
1088 }
1089
1090 gcc_unreachable ();
1091}
1092
1093/* Front-end wrappers for pragma registration to avoid dragging
1094 cpplib.h in almost everywhere. */
1095
1096static void
1097c_register_pragma_1 (const char *space, const char *name,
1098 pragma_handler handler, bool allow_expansion)
1099{
1100 unsigned id;
1101
1102 if (flag_preprocess_only)
1103 {
1104 pragma_ns_name ns_name;
1105
1106 if (!allow_expansion)
1107 return;
1108
1109 ns_name.space = space;
1110 ns_name.name = name;
1111 VEC_safe_push (pragma_ns_name, heap, registered_pp_pragmas, &ns_name);
1112 id = VEC_length (pragma_ns_name, registered_pp_pragmas);
1113 id += PRAGMA_FIRST_EXTERNAL - 1;
1114 }
1115 else
1116 {
1117 VEC_safe_push (pragma_handler, heap, registered_pragmas, &handler);
1118 id = VEC_length (pragma_handler, registered_pragmas);
1119 id += PRAGMA_FIRST_EXTERNAL - 1;
1120
1121 /* The C++ front end allocates 6 bits in cp_token; the C front end
1122 allocates 7 bits in c_token. At present this is sufficient. */
1123 gcc_assert (id < 64);
1124 }
1125
1126 cpp_register_deferred_pragma (parse_in, space, name, id,
1127 allow_expansion, false);
1128}
1129
1130void
1131c_register_pragma (const char *space, const char *name, pragma_handler handler)
1132{
1133 c_register_pragma_1 (space, name, handler, false);
1134}
1135
1136void
1137c_register_pragma_with_expansion (const char *space, const char *name,
1138 pragma_handler handler)
1139{
1140 c_register_pragma_1 (space, name, handler, true);
1141}
1142
1143void
1144c_invoke_pragma_handler (unsigned int id)
1145{
1146 pragma_handler handler;
1147
1148 id -= PRAGMA_FIRST_EXTERNAL;
1149 handler = *VEC_index (pragma_handler, registered_pragmas, id);
1150
1151 handler (parse_in);
1152}
1153
1154/* Set up front-end pragmas. */
1155void
1156init_pragma (void)
1157{
1158 if (flag_openmp)
1159 {
1160 const int n_omp_pragmas = sizeof (omp_pragmas) / sizeof (*omp_pragmas);
1161 int i;
1162
1163 for (i = 0; i < n_omp_pragmas; ++i)
1164 cpp_register_deferred_pragma (parse_in, "omp", omp_pragmas[i].name,
1165 omp_pragmas[i].id, true, true);
1166 }
1167
1168 if (!flag_preprocess_only)
1169 cpp_register_deferred_pragma (parse_in, "GCC", "pch_preprocess",
1170 PRAGMA_GCC_PCH_PREPROCESS, false, false);
1171
1172#ifdef HANDLE_PRAGMA_PACK
1173#ifdef HANDLE_PRAGMA_PACK_WITH_EXPANSION
1174 c_register_pragma_with_expansion (0, "pack", handle_pragma_pack);
1175#else
1176 c_register_pragma (0, "pack", handle_pragma_pack);
1177#endif
1178#endif
c251ad9e
SS
1179#ifdef HANDLE_PRAGMA_WEAK
1180 c_register_pragma (0, "weak", handle_pragma_weak);
1181#endif
1182#ifdef HANDLE_PRAGMA_VISIBILITY
1183 c_register_pragma ("GCC", "visibility", handle_pragma_visibility);
1184#endif
1185
1186 c_register_pragma ("GCC", "diagnostic", handle_pragma_diagnostic);
1187 c_register_pragma ("GCC", "target", handle_pragma_target);
1188 c_register_pragma ("GCC", "optimize", handle_pragma_optimize);
1189 c_register_pragma ("GCC", "push_options", handle_pragma_push_options);
1190 c_register_pragma ("GCC", "pop_options", handle_pragma_pop_options);
1191 c_register_pragma ("GCC", "reset_options", handle_pragma_reset_options);
1192
1193 c_register_pragma_with_expansion (0, "redefine_extname", handle_pragma_redefine_extname);
1194 c_register_pragma (0, "extern_prefix", handle_pragma_extern_prefix);
1195
1196 c_register_pragma_with_expansion (0, "message", handle_pragma_message);
1197
1198#ifdef REGISTER_TARGET_PRAGMAS
1199 REGISTER_TARGET_PRAGMAS ();
1200#endif
1201}
1202
1203#include "gt-c-pragma.h"