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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.2.2/] [gcc/] [c-pragma.c] - Blame information for rev 154

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1 38 julius
/* 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 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 "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
 
46
typedef struct align_stack GTY(())
47
{
48
  int                  alignment;
49
  tree                 id;
50
  struct align_stack * prev;
51
} align_stack;
52
 
53
static GTY(()) struct align_stack * alignment_stack;
54
 
55
#ifdef HANDLE_PRAGMA_PACK
56
static 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.  */
64
static int default_alignment;
65
#define SET_GLOBAL_ALIGNMENT(ALIGN) (maximum_field_alignment = *(alignment_stack == NULL \
66
        ? &default_alignment \
67
        : &alignment_stack->alignment) = (ALIGN))
68
 
69
static void push_alignment (int, tree);
70
static void pop_alignment (tree);
71
 
72
/* Push an alignment value onto the stack.  */
73
static void
74
push_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
 
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.  */
96
static void
97
pop_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) */
143
static void
144
handle_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
 
247
static GTY(()) tree pending_weaks;
248
 
249
#ifdef HANDLE_PRAGMA_WEAK
250
static void apply_pragma_weak (tree, tree);
251
static void handle_pragma_weak (cpp_reader *);
252
 
253
static void
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
      && 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
 
274
void
275
maybe_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.  */
307
void
308
maybe_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] */
333
static void
334
handle_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
364
void
365
maybe_apply_pragma_weak (tree ARG_UNUSED (decl))
366
{
367
}
368
 
369
void
370
maybe_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
 
407
static GTY(()) tree pending_redefine_extname;
408
 
409
static void handle_pragma_redefine_extname (cpp_reader *);
410
 
411
/* #pragma redefine_extname oldname newname */
412
static void
413
handle_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.  */
463
void
464
add_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
 
479
static GTY(()) tree pragma_extern_prefix;
480
 
481
/* #pragma extern_prefix "prefix" */
482
static void
483
handle_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
 
505
tree
506
maybe_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
594
static void handle_pragma_visibility (cpp_reader *);
595
 
596
typedef enum symbol_visibility visibility;
597
DEF_VEC_I (visibility);
598
DEF_VEC_ALLOC_I (visibility, heap);
599
static VEC (visibility, heap) *visstack;
600
 
601
/* Push the visibility indicated by STR onto the top of the #pragma
602
   visibility stack.  */
603
 
604
void
605
push_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
 
624
void
625
pop_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
 
635
static void
636
handle_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
 
682
static void
683
handle_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
/* A vector of registered pragma callbacks.  */
730
 
731
DEF_VEC_O (pragma_handler);
732
DEF_VEC_ALLOC_O (pragma_handler, heap);
733
 
734
static VEC(pragma_handler, heap) *registered_pragmas;
735
 
736
/* Front-end wrappers for pragma registration to avoid dragging
737
   cpplib.h in almost everywhere.  */
738
 
739
static void
740
c_register_pragma_1 (const char *space, const char *name,
741
                     pragma_handler handler, bool allow_expansion)
742
{
743
  unsigned id;
744
 
745
  VEC_safe_push (pragma_handler, heap, registered_pragmas, &handler);
746
  id = VEC_length (pragma_handler, registered_pragmas);
747
  id += PRAGMA_FIRST_EXTERNAL - 1;
748
 
749
  /* The C++ front end allocates 6 bits in cp_token; the C front end
750
     allocates 7 bits in c_token.  At present this is sufficient.  */
751
  gcc_assert (id < 64);
752
 
753
  cpp_register_deferred_pragma (parse_in, space, name, id,
754
                                allow_expansion, false);
755
}
756
 
757
void
758
c_register_pragma (const char *space, const char *name, pragma_handler handler)
759
{
760
  c_register_pragma_1 (space, name, handler, false);
761
}
762
 
763
void
764
c_register_pragma_with_expansion (const char *space, const char *name,
765
                                  pragma_handler handler)
766
{
767
  c_register_pragma_1 (space, name, handler, true);
768
}
769
 
770
void
771
c_invoke_pragma_handler (unsigned int id)
772
{
773
  pragma_handler handler;
774
 
775
  id -= PRAGMA_FIRST_EXTERNAL;
776
  handler = *VEC_index (pragma_handler, registered_pragmas, id);
777
 
778
  handler (parse_in);
779
}
780
 
781
/* Set up front-end pragmas.  */
782
void
783
init_pragma (void)
784
{
785
  if (flag_openmp && !flag_preprocess_only)
786
    {
787
      struct omp_pragma_def { const char *name; unsigned int id; };
788
      static const struct omp_pragma_def omp_pragmas[] = {
789
        { "atomic", PRAGMA_OMP_ATOMIC },
790
        { "barrier", PRAGMA_OMP_BARRIER },
791
        { "critical", PRAGMA_OMP_CRITICAL },
792
        { "flush", PRAGMA_OMP_FLUSH },
793
        { "for", PRAGMA_OMP_FOR },
794
        { "master", PRAGMA_OMP_MASTER },
795
        { "ordered", PRAGMA_OMP_ORDERED },
796
        { "parallel", PRAGMA_OMP_PARALLEL },
797
        { "section", PRAGMA_OMP_SECTION },
798
        { "sections", PRAGMA_OMP_SECTIONS },
799
        { "single", PRAGMA_OMP_SINGLE },
800
        { "threadprivate", PRAGMA_OMP_THREADPRIVATE }
801
      };
802
 
803
      const int n_omp_pragmas = sizeof (omp_pragmas) / sizeof (*omp_pragmas);
804
      int i;
805
 
806
      for (i = 0; i < n_omp_pragmas; ++i)
807
        cpp_register_deferred_pragma (parse_in, "omp", omp_pragmas[i].name,
808
                                      omp_pragmas[i].id, true, true);
809
    }
810
 
811
  cpp_register_deferred_pragma (parse_in, "GCC", "pch_preprocess",
812
                                PRAGMA_GCC_PCH_PREPROCESS, false, false);
813
 
814
#ifdef HANDLE_PRAGMA_PACK
815
#ifdef HANDLE_PRAGMA_PACK_WITH_EXPANSION
816
  c_register_pragma_with_expansion (0, "pack", handle_pragma_pack);
817
#else
818
  c_register_pragma (0, "pack", handle_pragma_pack);
819
#endif
820
#endif
821
#ifdef HANDLE_PRAGMA_WEAK
822
  c_register_pragma (0, "weak", handle_pragma_weak);
823
#endif
824
#ifdef HANDLE_PRAGMA_VISIBILITY
825
  c_register_pragma ("GCC", "visibility", handle_pragma_visibility);
826
#endif
827
 
828
  c_register_pragma ("GCC", "diagnostic", handle_pragma_diagnostic);
829
 
830
  c_register_pragma_with_expansion (0, "redefine_extname", handle_pragma_redefine_extname);
831
  c_register_pragma (0, "extern_prefix", handle_pragma_extern_prefix);
832
 
833
#ifdef REGISTER_TARGET_PRAGMAS
834
  REGISTER_TARGET_PRAGMAS ();
835
#endif
836
}
837
 
838
#include "gt-c-pragma.h"

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