1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
|
/* Handle #pragma, system V.4 style. Supports #pragma weak and #pragma pack.
Copyright (C) 1992, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING. If not, write to the Free
Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "rtl.h"
#include "tree.h"
#include "function.h"
#include "cpplib.h"
#include "c-pragma.h"
#include "flags.h"
#include "toplev.h"
#include "ggc.h"
#include "c-common.h"
#include "output.h"
#include "tm_p.h"
#include "vec.h"
#include "target.h"
#define GCC_BAD(gmsgid) \
do { warning (OPT_Wpragmas, gmsgid); return; } while (0)
#define GCC_BAD2(gmsgid, arg) \
do { warning (OPT_Wpragmas, gmsgid, arg); return; } while (0)
typedef struct align_stack GTY(())
{
int alignment;
tree id;
struct align_stack * prev;
} align_stack;
static GTY(()) struct align_stack * alignment_stack;
#ifdef HANDLE_PRAGMA_PACK
static void handle_pragma_pack (cpp_reader *);
#ifdef HANDLE_PRAGMA_PACK_PUSH_POP
/* If we have a "global" #pragma pack(<n>) in effect when the first
#pragma pack(push,<n>) is encountered, this stores the value of
maximum_field_alignment in effect. When the final pop_alignment()
happens, we restore the value to this, not to a value of 0 for
maximum_field_alignment. Value is in bits. */
static int default_alignment;
#define SET_GLOBAL_ALIGNMENT(ALIGN) (maximum_field_alignment = *(alignment_stack == NULL \
? &default_alignment \
: &alignment_stack->alignment) = (ALIGN))
static void push_alignment (int, tree);
static void pop_alignment (tree);
/* Push an alignment value onto the stack. */
static void
push_alignment (int alignment, tree id)
{
align_stack * entry;
entry = GGC_NEW (align_stack);
entry->alignment = alignment;
entry->id = id;
entry->prev = alignment_stack;
/* The current value of maximum_field_alignment is not necessarily
0 since there may be a #pragma pack(<n>) in effect; remember it
so that we can restore it after the final #pragma pop(). */
if (alignment_stack == NULL)
default_alignment = maximum_field_alignment;
alignment_stack = entry;
maximum_field_alignment = alignment;
}
/* Undo a push of an alignment onto the stack. */
static void
pop_alignment (tree id)
{
align_stack * entry;
if (alignment_stack == NULL)
GCC_BAD ("#pragma pack (pop) encountered without matching #pragma pack (push)");
/* If we got an identifier, strip away everything above the target
entry so that the next step will restore the state just below it. */
if (id)
{
for (entry = alignment_stack; entry; entry = entry->prev)
if (entry->id == id)
{
alignment_stack = entry;
break;
}
if (entry == NULL)
warning (OPT_Wpragmas, "\
#pragma pack(pop, %s) encountered without matching #pragma pack(push, %s)"
, IDENTIFIER_POINTER (id), IDENTIFIER_POINTER (id));
}
entry = alignment_stack->prev;
maximum_field_alignment = entry ? entry->alignment : default_alignment;
alignment_stack = entry;
}
#else /* not HANDLE_PRAGMA_PACK_PUSH_POP */
#define SET_GLOBAL_ALIGNMENT(ALIGN) (maximum_field_alignment = (ALIGN))
#define push_alignment(ID, N) \
GCC_BAD ("#pragma pack(push[, id], <n>) is not supported on this target")
#define pop_alignment(ID) \
GCC_BAD ("#pragma pack(pop[, id], <n>) is not supported on this target")
#endif /* HANDLE_PRAGMA_PACK_PUSH_POP */
/* #pragma pack ()
#pragma pack (N)
#pragma pack (push)
#pragma pack (push, N)
#pragma pack (push, ID)
#pragma pack (push, ID, N)
#pragma pack (pop)
#pragma pack (pop, ID) */
static void
handle_pragma_pack (cpp_reader * ARG_UNUSED (dummy))
{
tree x, id = 0;
int align = -1;
enum cpp_ttype token;
enum { set, push, pop } action;
if (pragma_lex (&x) != CPP_OPEN_PAREN)
GCC_BAD ("missing %<(%> after %<#pragma pack%> - ignored");
token = pragma_lex (&x);
if (token == CPP_CLOSE_PAREN)
{
action = set;
align = initial_max_fld_align;
}
else if (token == CPP_NUMBER)
{
align = TREE_INT_CST_LOW (x);
action = set;
if (pragma_lex (&x) != CPP_CLOSE_PAREN)
GCC_BAD ("malformed %<#pragma pack%> - ignored");
}
else if (token == CPP_NAME)
{
#define GCC_BAD_ACTION do { if (action != pop) \
GCC_BAD ("malformed %<#pragma pack(push[, id][, <n>])%> - ignored"); \
else \
GCC_BAD ("malformed %<#pragma pack(pop[, id])%> - ignored"); \
} while (0)
const char *op = IDENTIFIER_POINTER (x);
if (!strcmp (op, "push"))
action = push;
else if (!strcmp (op, "pop"))
action = pop;
else
GCC_BAD2 ("unknown action %qs for %<#pragma pack%> - ignored", op);
while ((token = pragma_lex (&x)) == CPP_COMMA)
{
token = pragma_lex (&x);
if (token == CPP_NAME && id == 0)
{
id = x;
}
else if (token == CPP_NUMBER && action == push && align == -1)
{
align = TREE_INT_CST_LOW (x);
if (align == -1)
action = set;
}
else
GCC_BAD_ACTION;
}
if (token != CPP_CLOSE_PAREN)
GCC_BAD_ACTION;
#undef GCC_BAD_ACTION
}
else
GCC_BAD ("malformed %<#pragma pack%> - ignored");
if (pragma_lex (&x) != CPP_EOF)
warning (OPT_Wpragmas, "junk at end of %<#pragma pack%>");
if (flag_pack_struct)
GCC_BAD ("#pragma pack has no effect with -fpack-struct - ignored");
if (action != pop)
switch (align)
{
case 0:
case 1:
case 2:
case 4:
case 8:
case 16:
align *= BITS_PER_UNIT;
break;
case -1:
if (action == push)
{
align = maximum_field_alignment;
break;
}
default:
GCC_BAD2 ("alignment must be a small power of two, not %d", align);
}
switch (action)
{
case set: SET_GLOBAL_ALIGNMENT (align); break;
case push: push_alignment (align, id); break;
case pop: pop_alignment (id); break;
}
}
#endif /* HANDLE_PRAGMA_PACK */
static GTY(()) tree pending_weaks;
#ifdef HANDLE_PRAGMA_WEAK
static void apply_pragma_weak (tree, tree);
static void handle_pragma_weak (cpp_reader *);
static void
apply_pragma_weak (tree decl, tree value)
{
if (value)
{
value = build_string (IDENTIFIER_LENGTH (value),
IDENTIFIER_POINTER (value));
decl_attributes (&decl, build_tree_list (get_identifier ("alias"),
build_tree_list (NULL, value)),
0);
}
if (SUPPORTS_WEAK && DECL_EXTERNAL (decl) && TREE_USED (decl)
&& !DECL_WEAK (decl) /* Don't complain about a redundant #pragma. */
&& TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
warning (OPT_Wpragmas, "applying #pragma weak %q+D after first use "
"results in unspecified behavior", decl);
declare_weak (decl);
}
void
maybe_apply_pragma_weak (tree decl)
{
tree *p, t, id;
/* Avoid asking for DECL_ASSEMBLER_NAME when it's not needed. */
/* No weak symbols pending, take the short-cut. */
if (!pending_weaks)
return;
/* If it's not visible outside this file, it doesn't matter whether
it's weak. */
if (!DECL_EXTERNAL (decl) && !TREE_PUBLIC (decl))
return;
/* If it's not a function or a variable, it can't be weak.
FIXME: what kinds of things are visible outside this file but
aren't functions or variables? Should this be an assert instead? */
if (TREE_CODE (decl) != FUNCTION_DECL && TREE_CODE (decl) != VAR_DECL)
return;
id = DECL_ASSEMBLER_NAME (decl);
for (p = &pending_weaks; (t = *p) ; p = &TREE_CHAIN (t))
if (id == TREE_PURPOSE (t))
{
apply_pragma_weak (decl, TREE_VALUE (t));
*p = TREE_CHAIN (t);
break;
}
}
/* Process all "#pragma weak A = B" directives where we have not seen
a decl for A. */
void
maybe_apply_pending_pragma_weaks (void)
{
tree *p, t, alias_id, id, decl, *next;
for (p = &pending_weaks; (t = *p) ; p = next)
{
next = &TREE_CHAIN (t);
alias_id = TREE_PURPOSE (t);
id = TREE_VALUE (t);
if (TREE_VALUE (t) == NULL)
continue;
decl = build_decl (FUNCTION_DECL, alias_id, default_function_type);
DECL_ARTIFICIAL (decl) = 1;
TREE_PUBLIC (decl) = 1;
DECL_EXTERNAL (decl) = 1;
DECL_WEAK (decl) = 1;
assemble_alias (decl, id);
}
}
/* #pragma weak name [= value] */
static void
handle_pragma_weak (cpp_reader * ARG_UNUSED (dummy))
{
tree name, value, x, decl;
enum cpp_ttype t;
value = 0;
if (pragma_lex (&name) != CPP_NAME)
GCC_BAD ("malformed #pragma weak, ignored");
t = pragma_lex (&x);
if (t == CPP_EQ)
{
if (pragma_lex (&value) != CPP_NAME)
GCC_BAD ("malformed #pragma weak, ignored");
t = pragma_lex (&x);
}
if (t != CPP_EOF)
warning (OPT_Wpragmas, "junk at end of %<#pragma weak%>");
decl = identifier_global_value (name);
if (decl && DECL_P (decl))
{
apply_pragma_weak (decl, value);
if (value)
assemble_alias (decl, value);
}
else
pending_weaks = tree_cons (name, value, pending_weaks);
}
#else
void
maybe_apply_pragma_weak (tree ARG_UNUSED (decl))
{
}
void
maybe_apply_pending_pragma_weaks (void)
{
}
#endif /* HANDLE_PRAGMA_WEAK */
/* GCC supports two #pragma directives for renaming the external
symbol associated with a declaration (DECL_ASSEMBLER_NAME), for
compatibility with the Solaris and Tru64 system headers. GCC also
has its own notation for this, __asm__("name") annotations.
Corner cases of these features and their interaction:
1) Both pragmas silently apply only to declarations with external
linkage (that is, TREE_PUBLIC || DECL_EXTERNAL). Asm labels
do not have this restriction.
2) In C++, both #pragmas silently apply only to extern "C" declarations.
Asm labels do not have this restriction.
3) If any of the three ways of changing DECL_ASSEMBLER_NAME is
applied to a decl whose DECL_ASSEMBLER_NAME is already set, and the
new name is different, a warning issues and the name does not change.
4) The "source name" for #pragma redefine_extname is the DECL_NAME,
*not* the DECL_ASSEMBLER_NAME.
5) If #pragma extern_prefix is in effect and a declaration occurs
with an __asm__ name, the #pragma extern_prefix is silently
ignored for that declaration.
6) If #pragma extern_prefix and #pragma redefine_extname apply to
the same declaration, whichever triggered first wins, and a warning
is issued. (We would like to have #pragma redefine_extname always
win, but it can appear either before or after the declaration, and
if it appears afterward, we have no way of knowing whether a modified
DECL_ASSEMBLER_NAME is due to #pragma extern_prefix.) */
static GTY(()) tree pending_redefine_extname;
static void handle_pragma_redefine_extname (cpp_reader *);
/* #pragma redefine_extname oldname newname */
static void
handle_pragma_redefine_extname (cpp_reader * ARG_UNUSED (dummy))
{
tree oldname, newname, decl, x;
enum cpp_ttype t;
if (pragma_lex (&oldname) != CPP_NAME)
GCC_BAD ("malformed #pragma redefine_extname, ignored");
if (pragma_lex (&newname) != CPP_NAME)
GCC_BAD ("malformed #pragma redefine_extname, ignored");
t = pragma_lex (&x);
if (t != CPP_EOF)
warning (OPT_Wpragmas, "junk at end of %<#pragma redefine_extname%>");
if (!flag_mudflap && !targetm.handle_pragma_redefine_extname)
{
if (warn_unknown_pragmas > in_system_header)
warning (OPT_Wunknown_pragmas,
"#pragma redefine_extname not supported on this target");
return;
}
decl = identifier_global_value (oldname);
if (decl
&& (TREE_PUBLIC (decl) || DECL_EXTERNAL (decl))
&& (TREE_CODE (decl) == FUNCTION_DECL
|| TREE_CODE (decl) == VAR_DECL)
&& has_c_linkage (decl))
{
if (DECL_ASSEMBLER_NAME_SET_P (decl))
{
const char *name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
name = targetm.strip_name_encoding (name);
if (strcmp (name, IDENTIFIER_POINTER (newname)))
warning (OPT_Wpragmas, "#pragma redefine_extname ignored due to "
"conflict with previous rename");
}
else
change_decl_assembler_name (decl, newname);
}
else
/* We have to add this to the rename list even if there's already
a global value that doesn't meet the above criteria, because in
C++ "struct foo {...};" puts "foo" in the current namespace but
does *not* conflict with a subsequent declaration of a function
or variable foo. See g++.dg/other/pragma-re-2.C. */
add_to_renaming_pragma_list (oldname, newname);
}
/* This is called from here and from ia64.c. */
void
add_to_renaming_pragma_list (tree oldname, tree newname)
{
tree previous = purpose_member (oldname, pending_redefine_extname);
if (previous)
{
if (TREE_VALUE (previous) != newname)
warning (OPT_Wpragmas, "#pragma redefine_extname ignored due to "
"conflict with previous #pragma redefine_extname");
return;
}
pending_redefine_extname
= tree_cons (oldname, newname, pending_redefine_extname);
}
static GTY(()) tree pragma_extern_prefix;
/* #pragma extern_prefix "prefix" */
static void
handle_pragma_extern_prefix (cpp_reader * ARG_UNUSED (dummy))
{
tree prefix, x;
enum cpp_ttype t;
if (pragma_lex (&prefix) != CPP_STRING)
GCC_BAD ("malformed #pragma extern_prefix, ignored");
t = pragma_lex (&x);
if (t != CPP_EOF)
warning (OPT_Wpragmas, "junk at end of %<#pragma extern_prefix%>");
if (targetm.handle_pragma_extern_prefix)
/* Note that the length includes the null terminator. */
pragma_extern_prefix = (TREE_STRING_LENGTH (prefix) > 1 ? prefix : NULL);
else if (warn_unknown_pragmas > in_system_header)
warning (OPT_Wunknown_pragmas,
"#pragma extern_prefix not supported on this target");
}
/* Hook from the front ends to apply the results of one of the preceding
pragmas that rename variables. */
tree
maybe_apply_renaming_pragma (tree decl, tree asmname)
{
tree *p, t;
/* The renaming pragmas are only applied to declarations with
external linkage. */
if ((TREE_CODE (decl) != FUNCTION_DECL && TREE_CODE (decl) != VAR_DECL)
|| (!TREE_PUBLIC (decl) && !DECL_EXTERNAL (decl))
|| !has_c_linkage (decl))
return asmname;
/* If the DECL_ASSEMBLER_NAME is already set, it does not change,
but we may warn about a rename that conflicts. */
if (DECL_ASSEMBLER_NAME_SET_P (decl))
{
const char *oldname = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
oldname = targetm.strip_name_encoding (oldname);
if (asmname && strcmp (TREE_STRING_POINTER (asmname), oldname))
warning (OPT_Wpragmas, "asm declaration ignored due to "
"conflict with previous rename");
/* Take any pending redefine_extname off the list. */
for (p = &pending_redefine_extname; (t = *p); p = &TREE_CHAIN (t))
if (DECL_NAME (decl) == TREE_PURPOSE (t))
{
/* Only warn if there is a conflict. */
if (strcmp (IDENTIFIER_POINTER (TREE_VALUE (t)), oldname))
warning (OPT_Wpragmas, "#pragma redefine_extname ignored due to "
"conflict with previous rename");
*p = TREE_CHAIN (t);
break;
}
return 0;
}
/* Find out if we have a pending #pragma redefine_extname. */
for (p = &pending_redefine_extname; (t = *p); p = &TREE_CHAIN (t))
if (DECL_NAME (decl) == TREE_PURPOSE (t))
{
tree newname = TREE_VALUE (t);
*p = TREE_CHAIN (t);
/* If we already have an asmname, #pragma redefine_extname is
ignored (with a warning if it conflicts). */
if (asmname)
{
if (strcmp (TREE_STRING_POINTER (asmname),
IDENTIFIER_POINTER (newname)) != 0)
warning (OPT_Wpragmas, "#pragma redefine_extname ignored due to "
"conflict with __asm__ declaration");
return asmname;
}
/* Otherwise we use what we've got; #pragma extern_prefix is
silently ignored. */
return build_string (IDENTIFIER_LENGTH (newname),
IDENTIFIER_POINTER (newname));
}
/* If we've got an asmname, #pragma extern_prefix is silently ignored. */
if (asmname)
return asmname;
/* If #pragma extern_prefix is in effect, apply it. */
if (pragma_extern_prefix)
{
const char *prefix = TREE_STRING_POINTER (pragma_extern_prefix);
size_t plen = TREE_STRING_LENGTH (pragma_extern_prefix) - 1;
const char *id = IDENTIFIER_POINTER (DECL_NAME (decl));
size_t ilen = IDENTIFIER_LENGTH (DECL_NAME (decl));
char *newname = (char *) alloca (plen + ilen + 1);
memcpy (newname, prefix, plen);
memcpy (newname + plen, id, ilen + 1);
return build_string (plen + ilen, newname);
}
/* Nada. */
return 0;
}
#ifdef HANDLE_PRAGMA_VISIBILITY
static void handle_pragma_visibility (cpp_reader *);
typedef enum symbol_visibility visibility;
DEF_VEC_I (visibility);
DEF_VEC_ALLOC_I (visibility, heap);
/* Sets the default visibility for symbols to something other than that
specified on the command line. */
static void
handle_pragma_visibility (cpp_reader *dummy ATTRIBUTE_UNUSED)
{
/* Form is #pragma GCC visibility push(hidden)|pop */
tree x;
enum cpp_ttype token;
enum { bad, push, pop } action = bad;
static VEC (visibility, heap) *visstack;
token = pragma_lex (&x);
if (token == CPP_NAME)
{
const char *op = IDENTIFIER_POINTER (x);
if (!strcmp (op, "push"))
action = push;
else if (!strcmp (op, "pop"))
action = pop;
}
if (bad == action)
GCC_BAD ("#pragma GCC visibility must be followed by push or pop");
else
{
if (pop == action)
{
if (!VEC_length (visibility, visstack))
{
GCC_BAD ("no matching push for %<#pragma GCC visibility pop%>");
}
else
{
default_visibility = VEC_pop (visibility, visstack);
visibility_options.inpragma
= VEC_length (visibility, visstack) != 0;
}
}
else
{
if (pragma_lex (&x) != CPP_OPEN_PAREN)
GCC_BAD ("missing %<(%> after %<#pragma GCC visibility push%> - ignored");
token = pragma_lex (&x);
if (token != CPP_NAME)
{
GCC_BAD ("malformed #pragma GCC visibility push");
}
else
{
const char *str = IDENTIFIER_POINTER (x);
VEC_safe_push (visibility, heap, visstack,
default_visibility);
if (!strcmp (str, "default"))
default_visibility = VISIBILITY_DEFAULT;
else if (!strcmp (str, "internal"))
default_visibility = VISIBILITY_INTERNAL;
else if (!strcmp (str, "hidden"))
default_visibility = VISIBILITY_HIDDEN;
else if (!strcmp (str, "protected"))
default_visibility = VISIBILITY_PROTECTED;
else
{
GCC_BAD ("#pragma GCC visibility push() must specify default, internal, hidden or protected");
}
visibility_options.inpragma = 1;
}
if (pragma_lex (&x) != CPP_CLOSE_PAREN)
GCC_BAD ("missing %<(%> after %<#pragma GCC visibility push%> - ignored");
}
}
if (pragma_lex (&x) != CPP_EOF)
warning (OPT_Wpragmas, "junk at end of %<#pragma GCC visibility%>");
}
#endif
/* A vector of registered pragma callbacks. */
DEF_VEC_O (pragma_handler);
DEF_VEC_ALLOC_O (pragma_handler, heap);
static VEC(pragma_handler, heap) *registered_pragmas;
/* Front-end wrappers for pragma registration to avoid dragging
cpplib.h in almost everywhere. */
static void
c_register_pragma_1 (const char *space, const char *name,
pragma_handler handler, bool allow_expansion)
{
unsigned id;
VEC_safe_push (pragma_handler, heap, registered_pragmas, &handler);
id = VEC_length (pragma_handler, registered_pragmas);
id += PRAGMA_FIRST_EXTERNAL - 1;
/* The C++ front end allocates 6 bits in cp_token; the C front end
allocates 7 bits in c_token. At present this is sufficient. */
gcc_assert (id < 64);
cpp_register_deferred_pragma (parse_in, space, name, id,
allow_expansion, false);
}
void
c_register_pragma (const char *space, const char *name, pragma_handler handler)
{
c_register_pragma_1 (space, name, handler, false);
}
void
c_register_pragma_with_expansion (const char *space, const char *name,
pragma_handler handler)
{
c_register_pragma_1 (space, name, handler, true);
}
void
c_invoke_pragma_handler (unsigned int id)
{
pragma_handler handler;
id -= PRAGMA_FIRST_EXTERNAL;
handler = *VEC_index (pragma_handler, registered_pragmas, id);
handler (parse_in);
}
/* Set up front-end pragmas. */
void
init_pragma (void)
{
if (flag_openmp && !flag_preprocess_only)
{
struct omp_pragma_def { const char *name; unsigned int id; };
static const struct omp_pragma_def omp_pragmas[] = {
{ "atomic", PRAGMA_OMP_ATOMIC },
{ "barrier", PRAGMA_OMP_BARRIER },
{ "critical", PRAGMA_OMP_CRITICAL },
{ "flush", PRAGMA_OMP_FLUSH },
{ "for", PRAGMA_OMP_FOR },
{ "master", PRAGMA_OMP_MASTER },
{ "ordered", PRAGMA_OMP_ORDERED },
{ "parallel", PRAGMA_OMP_PARALLEL },
{ "section", PRAGMA_OMP_SECTION },
{ "sections", PRAGMA_OMP_SECTIONS },
{ "single", PRAGMA_OMP_SINGLE },
{ "threadprivate", PRAGMA_OMP_THREADPRIVATE }
};
const int n_omp_pragmas = sizeof (omp_pragmas) / sizeof (*omp_pragmas);
int i;
for (i = 0; i < n_omp_pragmas; ++i)
cpp_register_deferred_pragma (parse_in, "omp", omp_pragmas[i].name,
omp_pragmas[i].id, true, true);
}
cpp_register_deferred_pragma (parse_in, "GCC", "pch_preprocess",
PRAGMA_GCC_PCH_PREPROCESS, false, false);
#ifdef HANDLE_PRAGMA_PACK
#ifdef HANDLE_PRAGMA_PACK_WITH_EXPANSION
c_register_pragma_with_expansion (0, "pack", handle_pragma_pack);
#else
c_register_pragma (0, "pack", handle_pragma_pack);
#endif
#endif
#ifdef HANDLE_PRAGMA_WEAK
c_register_pragma (0, "weak", handle_pragma_weak);
#endif
#ifdef HANDLE_PRAGMA_VISIBILITY
c_register_pragma ("GCC", "visibility", handle_pragma_visibility);
#endif
c_register_pragma (0, "redefine_extname", handle_pragma_redefine_extname);
c_register_pragma (0, "extern_prefix", handle_pragma_extern_prefix);
#ifdef REGISTER_TARGET_PRAGMAS
REGISTER_TARGET_PRAGMAS ();
#endif
}
#include "gt-c-pragma.h"
|