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.
5 This file is part of GCC.
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
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
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/>. */
23 #include "coretypes.h"
38 #include "diagnostic.h"
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)
46 typedef struct align_stack
GTY(())
50 struct align_stack
* prev
;
53 static GTY(()) struct align_stack
* alignment_stack
;
55 #ifdef HANDLE_PRAGMA_PACK
56 static void handle_pragma_pack (cpp_reader
*);
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))
69 static void push_alignment (int, tree
);
70 static void pop_alignment (tree
);
72 /* Push an alignment value onto the stack. */
74 push_alignment (int alignment
, tree id
)
78 entry
= GGC_NEW (align_stack
);
80 entry
->alignment
= alignment
;
82 entry
->prev
= alignment_stack
;
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
;
90 alignment_stack
= entry
;
92 maximum_field_alignment
= alignment
;
95 /* Undo a push of an alignment onto the stack. */
97 pop_alignment (tree id
)
101 if (alignment_stack
== NULL
)
102 GCC_BAD ("#pragma pack (pop) encountered without matching #pragma pack (push)");
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. */
108 for (entry
= alignment_stack
; entry
; entry
= entry
->prev
)
111 alignment_stack
= entry
;
115 warning (OPT_Wpragmas
, "\
116 #pragma pack(pop, %s) encountered without matching #pragma pack(push, %s)"
117 , IDENTIFIER_POINTER (id
), IDENTIFIER_POINTER (id
));
120 entry
= alignment_stack
->prev
;
122 maximum_field_alignment
= entry
? entry
->alignment
: default_alignment
;
124 alignment_stack
= entry
;
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 */
138 #pragma pack (push, N)
139 #pragma pack (push, ID)
140 #pragma pack (push, ID, N)
142 #pragma pack (pop, ID) */
144 handle_pragma_pack (cpp_reader
* ARG_UNUSED (dummy
))
148 enum cpp_ttype token
;
149 enum { set
, push
, pop
} action
;
151 if (pragma_lex (&x
) != CPP_OPEN_PAREN
)
152 GCC_BAD ("missing %<(%> after %<#pragma pack%> - ignored");
154 token
= pragma_lex (&x
);
155 if (token
== CPP_CLOSE_PAREN
)
158 align
= initial_max_fld_align
;
160 else if (token
== CPP_NUMBER
)
162 if (TREE_CODE (x
) != INTEGER_CST
)
163 GCC_BAD ("invalid constant in %<#pragma pack%> - ignored");
164 align
= TREE_INT_CST_LOW (x
);
166 if (pragma_lex (&x
) != CPP_CLOSE_PAREN
)
167 GCC_BAD ("malformed %<#pragma pack%> - ignored");
169 else if (token
== CPP_NAME
)
171 #define GCC_BAD_ACTION do { if (action != pop) \
172 GCC_BAD ("malformed %<#pragma pack(push[, id][, <n>])%> - ignored"); \
174 GCC_BAD ("malformed %<#pragma pack(pop[, id])%> - ignored"); \
177 const char *op
= IDENTIFIER_POINTER (x
);
178 if (!strcmp (op
, "push"))
180 else if (!strcmp (op
, "pop"))
183 GCC_BAD2 ("unknown action %qs for %<#pragma pack%> - ignored", op
);
185 while ((token
= pragma_lex (&x
)) == CPP_COMMA
)
187 token
= pragma_lex (&x
);
188 if (token
== CPP_NAME
&& id
== 0)
192 else if (token
== CPP_NUMBER
&& action
== push
&& align
== -1)
194 if (TREE_CODE (x
) != INTEGER_CST
)
195 GCC_BAD ("invalid constant in %<#pragma pack%> - ignored");
196 align
= TREE_INT_CST_LOW (x
);
204 if (token
!= CPP_CLOSE_PAREN
)
206 #undef GCC_BAD_ACTION
209 GCC_BAD ("malformed %<#pragma pack%> - ignored");
211 if (pragma_lex (&x
) != CPP_EOF
)
212 warning (OPT_Wpragmas
, "junk at end of %<#pragma pack%>");
214 if (flag_pack_struct
)
215 GCC_BAD ("#pragma pack has no effect with -fpack-struct - ignored");
226 align
*= BITS_PER_UNIT
;
231 align
= maximum_field_alignment
;
235 GCC_BAD2 ("alignment must be a small power of two, not %d", align
);
240 case set
: SET_GLOBAL_ALIGNMENT (align
); break;
241 case push
: push_alignment (align
, id
); break;
242 case pop
: pop_alignment (id
); break;
245 #endif /* HANDLE_PRAGMA_PACK */
247 struct def_pragma_macro_value
GTY(())
249 struct def_pragma_macro_value
*prev
;
253 struct def_pragma_macro
GTY(())
257 struct def_pragma_macro_value value
;
260 static GTY((param_is (struct def_pragma_macro
))) htab_t pushed_macro_table
;
262 #ifdef HANDLE_PRAGMA_PUSH_POP_MACRO
263 /* Hash table control functions for pushed_macro_table. */
265 dpm_hash (const void *p
)
267 return ((const struct def_pragma_macro
*)p
)->hash
;
271 dpm_eq (const void *pa
, const void *pb
)
273 const struct def_pragma_macro
*a
= pa
, *b
= pb
;
274 return a
->hash
== b
->hash
&& strcmp (a
->name
, b
->name
) == 0;
277 /* #pragma push_macro("MACRO_NAME")
278 #pragma pop_macro("MACRO_NAME") */
281 handle_pragma_push_macro (cpp_reader
*reader
)
284 enum cpp_ttype token
;
285 struct def_pragma_macro dummy
, *c
;
286 const char *macroname
;
289 if (pragma_lex (&x
) != CPP_OPEN_PAREN
)
290 GCC_BAD ("missing %<(%> after %<#pragma push_macro%> - ignored");
292 token
= pragma_lex (&id
);
294 /* Silently ignore */
295 if (token
== CPP_CLOSE_PAREN
)
297 if (token
!= CPP_STRING
)
298 GCC_BAD ("invalid constant in %<#pragma push_macro%> - ignored");
300 if (pragma_lex (&x
) != CPP_CLOSE_PAREN
)
301 GCC_BAD ("missing %<)%> after %<#pragma push_macro%> - ignored");
303 if (pragma_lex (&x
) != CPP_EOF
)
304 warning (OPT_Wpragmas
, "junk at end of %<#pragma push_macro%>");
306 /* Check for empty string, and silently ignore. */
307 if (TREE_STRING_LENGTH (id
) < 1)
309 macroname
= TREE_STRING_POINTER (id
);
311 if (pushed_macro_table
== NULL
)
312 pushed_macro_table
= htab_create_ggc (15, dpm_hash
, dpm_eq
, 0);
314 dummy
.hash
= htab_hash_string (macroname
);
315 dummy
.name
= macroname
;
316 slot
= htab_find_slot_with_hash (pushed_macro_table
, &dummy
,
321 *slot
= c
= ggc_alloc (sizeof (struct def_pragma_macro
));
322 c
->hash
= dummy
.hash
;
323 c
->name
= ggc_alloc_string (macroname
, TREE_STRING_LENGTH (id
) - 1);
324 c
->value
.prev
= NULL
;
328 struct def_pragma_macro_value
*v
;
329 v
= ggc_alloc (sizeof (struct def_pragma_macro_value
));
334 c
->value
.value
= cpp_push_definition (reader
, macroname
);
338 handle_pragma_pop_macro (cpp_reader
*reader
)
341 enum cpp_ttype token
;
342 struct def_pragma_macro dummy
, *c
;
343 const char *macroname
;
346 if (pragma_lex (&x
) != CPP_OPEN_PAREN
)
347 GCC_BAD ("missing %<(%> after %<#pragma pop_macro%> - ignored");
349 token
= pragma_lex (&id
);
351 /* Silently ignore */
352 if (token
== CPP_CLOSE_PAREN
)
354 if (token
!= CPP_STRING
)
355 GCC_BAD ("invalid constant in %<#pragma pop_macro%> - ignored");
357 if (pragma_lex (&x
) != CPP_CLOSE_PAREN
)
358 GCC_BAD ("missing %<)%> after %<#pragma pop_macro%> - ignored");
360 if (pragma_lex (&x
) != CPP_EOF
)
361 warning (OPT_Wpragmas
, "junk at end of %<#pragma pop_macro%>");
363 /* Check for empty string, and silently ignore. */
364 if (TREE_STRING_LENGTH (id
) < 1)
366 macroname
= TREE_STRING_POINTER (id
);
368 dummy
.hash
= htab_hash_string (macroname
);
369 dummy
.name
= macroname
;
370 if (pushed_macro_table
)
371 slot
= htab_find_slot_with_hash (pushed_macro_table
, &dummy
,
372 dummy
.hash
, NO_INSERT
);
377 cpp_pop_definition (reader
, c
->name
, c
->value
.value
);
380 c
->value
= *c
->value
.prev
;
382 htab_clear_slot (pushed_macro_table
, slot
);
384 #endif /* HANDLE_PRAGMA_PUSH_POP_MACRO */
386 static GTY(()) tree pending_weaks
;
388 #ifdef HANDLE_PRAGMA_WEAK
389 static void apply_pragma_weak (tree
, tree
);
390 static void handle_pragma_weak (cpp_reader
*);
393 apply_pragma_weak (tree decl
, tree value
)
397 value
= build_string (IDENTIFIER_LENGTH (value
),
398 IDENTIFIER_POINTER (value
));
399 decl_attributes (&decl
, build_tree_list (get_identifier ("alias"),
400 build_tree_list (NULL
, value
)),
404 if (SUPPORTS_WEAK
&& DECL_EXTERNAL (decl
) && TREE_USED (decl
)
405 && !DECL_WEAK (decl
) /* Don't complain about a redundant #pragma. */
406 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
407 warning (OPT_Wpragmas
, "applying #pragma weak %q+D after first use "
408 "results in unspecified behavior", decl
);
414 maybe_apply_pragma_weak (tree decl
)
418 /* Avoid asking for DECL_ASSEMBLER_NAME when it's not needed. */
420 /* No weak symbols pending, take the short-cut. */
423 /* If it's not visible outside this file, it doesn't matter whether
425 if (!DECL_EXTERNAL (decl
) && !TREE_PUBLIC (decl
))
427 /* If it's not a function or a variable, it can't be weak.
428 FIXME: what kinds of things are visible outside this file but
429 aren't functions or variables? Should this be an assert instead? */
430 if (TREE_CODE (decl
) != FUNCTION_DECL
&& TREE_CODE (decl
) != VAR_DECL
)
433 id
= DECL_ASSEMBLER_NAME (decl
);
435 for (p
= &pending_weaks
; (t
= *p
) ; p
= &TREE_CHAIN (t
))
436 if (id
== TREE_PURPOSE (t
))
438 apply_pragma_weak (decl
, TREE_VALUE (t
));
444 /* Process all "#pragma weak A = B" directives where we have not seen
447 maybe_apply_pending_pragma_weaks (void)
449 tree
*p
, t
, alias_id
, id
, decl
, *next
;
451 for (p
= &pending_weaks
; (t
= *p
) ; p
= next
)
453 next
= &TREE_CHAIN (t
);
454 alias_id
= TREE_PURPOSE (t
);
457 if (TREE_VALUE (t
) == NULL
)
460 decl
= build_decl (FUNCTION_DECL
, alias_id
, default_function_type
);
462 DECL_ARTIFICIAL (decl
) = 1;
463 TREE_PUBLIC (decl
) = 1;
464 DECL_EXTERNAL (decl
) = 1;
465 DECL_WEAK (decl
) = 1;
467 assemble_alias (decl
, id
);
471 /* #pragma weak name [= value] */
473 handle_pragma_weak (cpp_reader
* ARG_UNUSED (dummy
))
475 tree name
, value
, x
, decl
;
480 if (pragma_lex (&name
) != CPP_NAME
)
481 GCC_BAD ("malformed #pragma weak, ignored");
485 if (pragma_lex (&value
) != CPP_NAME
)
486 GCC_BAD ("malformed #pragma weak, ignored");
490 warning (OPT_Wpragmas
, "junk at end of %<#pragma weak%>");
492 decl
= identifier_global_value (name
);
493 if (decl
&& DECL_P (decl
))
495 apply_pragma_weak (decl
, value
);
497 assemble_alias (decl
, value
);
500 pending_weaks
= tree_cons (name
, value
, pending_weaks
);
504 maybe_apply_pragma_weak (tree
ARG_UNUSED (decl
))
509 maybe_apply_pending_pragma_weaks (void)
512 #endif /* HANDLE_PRAGMA_WEAK */
514 /* GCC supports two #pragma directives for renaming the external
515 symbol associated with a declaration (DECL_ASSEMBLER_NAME), for
516 compatibility with the Solaris and Tru64 system headers. GCC also
517 has its own notation for this, __asm__("name") annotations.
519 Corner cases of these features and their interaction:
521 1) Both pragmas silently apply only to declarations with external
522 linkage (that is, TREE_PUBLIC || DECL_EXTERNAL). Asm labels
523 do not have this restriction.
525 2) In C++, both #pragmas silently apply only to extern "C" declarations.
526 Asm labels do not have this restriction.
528 3) If any of the three ways of changing DECL_ASSEMBLER_NAME is
529 applied to a decl whose DECL_ASSEMBLER_NAME is already set, and the
530 new name is different, a warning issues and the name does not change.
532 4) The "source name" for #pragma redefine_extname is the DECL_NAME,
533 *not* the DECL_ASSEMBLER_NAME.
535 5) If #pragma extern_prefix is in effect and a declaration occurs
536 with an __asm__ name, the #pragma extern_prefix is silently
537 ignored for that declaration.
539 6) If #pragma extern_prefix and #pragma redefine_extname apply to
540 the same declaration, whichever triggered first wins, and a warning
541 is issued. (We would like to have #pragma redefine_extname always
542 win, but it can appear either before or after the declaration, and
543 if it appears afterward, we have no way of knowing whether a modified
544 DECL_ASSEMBLER_NAME is due to #pragma extern_prefix.) */
546 static GTY(()) tree pending_redefine_extname
;
548 static void handle_pragma_redefine_extname (cpp_reader
*);
550 /* #pragma redefine_extname oldname newname */
552 handle_pragma_redefine_extname (cpp_reader
* ARG_UNUSED (dummy
))
554 tree oldname
, newname
, decl
, x
;
557 if (pragma_lex (&oldname
) != CPP_NAME
)
558 GCC_BAD ("malformed #pragma redefine_extname, ignored");
559 if (pragma_lex (&newname
) != CPP_NAME
)
560 GCC_BAD ("malformed #pragma redefine_extname, ignored");
563 warning (OPT_Wpragmas
, "junk at end of %<#pragma redefine_extname%>");
565 if (!flag_mudflap
&& !targetm
.handle_pragma_redefine_extname
)
567 if (warn_unknown_pragmas
> in_system_header
)
568 warning (OPT_Wunknown_pragmas
,
569 "#pragma redefine_extname not supported on this target");
573 decl
= identifier_global_value (oldname
);
575 && (TREE_PUBLIC (decl
) || DECL_EXTERNAL (decl
))
576 && (TREE_CODE (decl
) == FUNCTION_DECL
577 || TREE_CODE (decl
) == VAR_DECL
)
578 && has_c_linkage (decl
))
580 if (DECL_ASSEMBLER_NAME_SET_P (decl
))
582 const char *name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
583 name
= targetm
.strip_name_encoding (name
);
585 if (strcmp (name
, IDENTIFIER_POINTER (newname
)))
586 warning (OPT_Wpragmas
, "#pragma redefine_extname ignored due to "
587 "conflict with previous rename");
590 change_decl_assembler_name (decl
, newname
);
593 /* We have to add this to the rename list even if there's already
594 a global value that doesn't meet the above criteria, because in
595 C++ "struct foo {...};" puts "foo" in the current namespace but
596 does *not* conflict with a subsequent declaration of a function
597 or variable foo. See g++.dg/other/pragma-re-2.C. */
598 add_to_renaming_pragma_list (oldname
, newname
);
601 /* This is called from here and from ia64.c. */
603 add_to_renaming_pragma_list (tree oldname
, tree newname
)
605 tree previous
= purpose_member (oldname
, pending_redefine_extname
);
608 if (TREE_VALUE (previous
) != newname
)
609 warning (OPT_Wpragmas
, "#pragma redefine_extname ignored due to "
610 "conflict with previous #pragma redefine_extname");
614 pending_redefine_extname
615 = tree_cons (oldname
, newname
, pending_redefine_extname
);
618 static GTY(()) tree pragma_extern_prefix
;
620 /* #pragma extern_prefix "prefix" */
622 handle_pragma_extern_prefix (cpp_reader
* ARG_UNUSED (dummy
))
627 if (pragma_lex (&prefix
) != CPP_STRING
)
628 GCC_BAD ("malformed #pragma extern_prefix, ignored");
631 warning (OPT_Wpragmas
, "junk at end of %<#pragma extern_prefix%>");
633 if (targetm
.handle_pragma_extern_prefix
)
634 /* Note that the length includes the null terminator. */
635 pragma_extern_prefix
= (TREE_STRING_LENGTH (prefix
) > 1 ? prefix
: NULL
);
636 else if (warn_unknown_pragmas
> in_system_header
)
637 warning (OPT_Wunknown_pragmas
,
638 "#pragma extern_prefix not supported on this target");
641 /* Hook from the front ends to apply the results of one of the preceding
642 pragmas that rename variables. */
645 maybe_apply_renaming_pragma (tree decl
, tree asmname
)
649 /* The renaming pragmas are only applied to declarations with
651 if ((TREE_CODE (decl
) != FUNCTION_DECL
&& TREE_CODE (decl
) != VAR_DECL
)
652 || (!TREE_PUBLIC (decl
) && !DECL_EXTERNAL (decl
))
653 || !has_c_linkage (decl
))
656 /* If the DECL_ASSEMBLER_NAME is already set, it does not change,
657 but we may warn about a rename that conflicts. */
658 if (DECL_ASSEMBLER_NAME_SET_P (decl
))
660 const char *oldname
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
661 oldname
= targetm
.strip_name_encoding (oldname
);
663 if (asmname
&& strcmp (TREE_STRING_POINTER (asmname
), oldname
))
664 warning (OPT_Wpragmas
, "asm declaration ignored due to "
665 "conflict with previous rename");
667 /* Take any pending redefine_extname off the list. */
668 for (p
= &pending_redefine_extname
; (t
= *p
); p
= &TREE_CHAIN (t
))
669 if (DECL_NAME (decl
) == TREE_PURPOSE (t
))
671 /* Only warn if there is a conflict. */
672 if (strcmp (IDENTIFIER_POINTER (TREE_VALUE (t
)), oldname
))
673 warning (OPT_Wpragmas
, "#pragma redefine_extname ignored due to "
674 "conflict with previous rename");
682 /* Find out if we have a pending #pragma redefine_extname. */
683 for (p
= &pending_redefine_extname
; (t
= *p
); p
= &TREE_CHAIN (t
))
684 if (DECL_NAME (decl
) == TREE_PURPOSE (t
))
686 tree newname
= TREE_VALUE (t
);
689 /* If we already have an asmname, #pragma redefine_extname is
690 ignored (with a warning if it conflicts). */
693 if (strcmp (TREE_STRING_POINTER (asmname
),
694 IDENTIFIER_POINTER (newname
)) != 0)
695 warning (OPT_Wpragmas
, "#pragma redefine_extname ignored due to "
696 "conflict with __asm__ declaration");
700 /* Otherwise we use what we've got; #pragma extern_prefix is
702 return build_string (IDENTIFIER_LENGTH (newname
),
703 IDENTIFIER_POINTER (newname
));
706 /* If we've got an asmname, #pragma extern_prefix is silently ignored. */
710 /* If #pragma extern_prefix is in effect, apply it. */
711 if (pragma_extern_prefix
)
713 const char *prefix
= TREE_STRING_POINTER (pragma_extern_prefix
);
714 size_t plen
= TREE_STRING_LENGTH (pragma_extern_prefix
) - 1;
716 const char *id
= IDENTIFIER_POINTER (DECL_NAME (decl
));
717 size_t ilen
= IDENTIFIER_LENGTH (DECL_NAME (decl
));
719 char *newname
= (char *) alloca (plen
+ ilen
+ 1);
721 memcpy (newname
, prefix
, plen
);
722 memcpy (newname
+ plen
, id
, ilen
+ 1);
724 return build_string (plen
+ ilen
, newname
);
732 #ifdef HANDLE_PRAGMA_VISIBILITY
733 static void handle_pragma_visibility (cpp_reader
*);
735 typedef enum symbol_visibility visibility
;
736 DEF_VEC_I (visibility
);
737 DEF_VEC_ALLOC_I (visibility
, heap
);
738 static VEC (visibility
, heap
) *visstack
;
740 /* Push the visibility indicated by STR onto the top of the #pragma
744 push_visibility (const char *str
)
746 VEC_safe_push (visibility
, heap
, visstack
,
748 if (!strcmp (str
, "default"))
749 default_visibility
= VISIBILITY_DEFAULT
;
750 else if (!strcmp (str
, "internal"))
751 default_visibility
= VISIBILITY_INTERNAL
;
752 else if (!strcmp (str
, "hidden"))
753 default_visibility
= VISIBILITY_HIDDEN
;
754 else if (!strcmp (str
, "protected"))
755 default_visibility
= VISIBILITY_PROTECTED
;
757 GCC_BAD ("#pragma GCC visibility push() must specify default, internal, hidden or protected");
758 visibility_options
.inpragma
= 1;
761 /* Pop a level of the #pragma visibility stack. */
764 pop_visibility (void)
766 default_visibility
= VEC_pop (visibility
, visstack
);
767 visibility_options
.inpragma
768 = VEC_length (visibility
, visstack
) != 0;
771 /* Sets the default visibility for symbols to something other than that
772 specified on the command line. */
775 handle_pragma_visibility (cpp_reader
*dummy ATTRIBUTE_UNUSED
)
777 /* Form is #pragma GCC visibility push(hidden)|pop */
779 enum cpp_ttype token
;
780 enum { bad
, push
, pop
} action
= bad
;
782 token
= pragma_lex (&x
);
783 if (token
== CPP_NAME
)
785 const char *op
= IDENTIFIER_POINTER (x
);
786 if (!strcmp (op
, "push"))
788 else if (!strcmp (op
, "pop"))
792 GCC_BAD ("#pragma GCC visibility must be followed by push or pop");
797 if (!VEC_length (visibility
, visstack
))
798 GCC_BAD ("no matching push for %<#pragma GCC visibility pop%>");
804 if (pragma_lex (&x
) != CPP_OPEN_PAREN
)
805 GCC_BAD ("missing %<(%> after %<#pragma GCC visibility push%> - ignored");
806 token
= pragma_lex (&x
);
807 if (token
!= CPP_NAME
)
808 GCC_BAD ("malformed #pragma GCC visibility push");
810 push_visibility (IDENTIFIER_POINTER (x
));
811 if (pragma_lex (&x
) != CPP_CLOSE_PAREN
)
812 GCC_BAD ("missing %<(%> after %<#pragma GCC visibility push%> - ignored");
815 if (pragma_lex (&x
) != CPP_EOF
)
816 warning (OPT_Wpragmas
, "junk at end of %<#pragma GCC visibility%>");
822 handle_pragma_diagnostic(cpp_reader
*ARG_UNUSED(dummy
))
824 const char *kind_string
, *option_string
;
825 unsigned int option_index
;
826 enum cpp_ttype token
;
832 error ("#pragma GCC diagnostic not allowed inside functions");
836 token
= pragma_lex (&x
);
837 if (token
!= CPP_NAME
)
838 GCC_BAD ("missing [error|warning|ignored] after %<#pragma GCC diagnostic%>");
839 kind_string
= IDENTIFIER_POINTER (x
);
840 if (strcmp (kind_string
, "error") == 0)
842 else if (strcmp (kind_string
, "warning") == 0)
844 else if (strcmp (kind_string
, "ignored") == 0)
847 GCC_BAD ("expected [error|warning|ignored] after %<#pragma GCC diagnostic%>");
849 token
= pragma_lex (&x
);
850 if (token
!= CPP_STRING
)
851 GCC_BAD ("missing option after %<#pragma GCC diagnostic%> kind");
852 option_string
= TREE_STRING_POINTER (x
);
853 for (option_index
= 0; option_index
< cl_options_count
; option_index
++)
854 if (strcmp (cl_options
[option_index
].opt_text
, option_string
) == 0)
856 /* This overrides -Werror, for example. */
857 diagnostic_classify_diagnostic (global_dc
, option_index
, kind
);
858 /* This makes sure the option is enabled, like -Wfoo would do. */
859 if (cl_options
[option_index
].var_type
== CLVC_BOOLEAN
860 && cl_options
[option_index
].flag_var
861 && kind
!= DK_IGNORED
)
862 *(int *) cl_options
[option_index
].flag_var
= 1;
865 GCC_BAD ("unknown option after %<#pragma GCC diagnostic%> kind");
868 /* A vector of registered pragma callbacks. */
870 DEF_VEC_O (pragma_handler
);
871 DEF_VEC_ALLOC_O (pragma_handler
, heap
);
873 static VEC(pragma_handler
, heap
) *registered_pragmas
;
881 DEF_VEC_O (pragma_ns_name
);
882 DEF_VEC_ALLOC_O (pragma_ns_name
, heap
);
884 static VEC(pragma_ns_name
, heap
) *registered_pp_pragmas
;
886 struct omp_pragma_def
{ const char *name
; unsigned int id
; };
887 static const struct omp_pragma_def omp_pragmas
[] = {
888 { "atomic", PRAGMA_OMP_ATOMIC
},
889 { "barrier", PRAGMA_OMP_BARRIER
},
890 { "critical", PRAGMA_OMP_CRITICAL
},
891 { "flush", PRAGMA_OMP_FLUSH
},
892 { "for", PRAGMA_OMP_FOR
},
893 { "master", PRAGMA_OMP_MASTER
},
894 { "ordered", PRAGMA_OMP_ORDERED
},
895 { "parallel", PRAGMA_OMP_PARALLEL
},
896 { "section", PRAGMA_OMP_SECTION
},
897 { "sections", PRAGMA_OMP_SECTIONS
},
898 { "single", PRAGMA_OMP_SINGLE
},
899 { "threadprivate", PRAGMA_OMP_THREADPRIVATE
}
903 c_pp_lookup_pragma (unsigned int id
, const char **space
, const char **name
)
905 const int n_omp_pragmas
= sizeof (omp_pragmas
) / sizeof (*omp_pragmas
);
908 for (i
= 0; i
< n_omp_pragmas
; ++i
)
909 if (omp_pragmas
[i
].id
== id
)
912 *name
= omp_pragmas
[i
].name
;
916 if (id
>= PRAGMA_FIRST_EXTERNAL
917 && (id
< PRAGMA_FIRST_EXTERNAL
918 + VEC_length (pragma_ns_name
, registered_pp_pragmas
)))
920 *space
= VEC_index (pragma_ns_name
, registered_pp_pragmas
,
921 id
- PRAGMA_FIRST_EXTERNAL
)->space
;
922 *name
= VEC_index (pragma_ns_name
, registered_pp_pragmas
,
923 id
- PRAGMA_FIRST_EXTERNAL
)->name
;
930 /* Front-end wrappers for pragma registration to avoid dragging
931 cpplib.h in almost everywhere. */
934 c_register_pragma_1 (const char *space
, const char *name
,
935 pragma_handler handler
, bool allow_expansion
)
939 if (flag_preprocess_only
)
941 pragma_ns_name ns_name
;
943 if (!allow_expansion
)
946 ns_name
.space
= space
;
948 VEC_safe_push (pragma_ns_name
, heap
, registered_pp_pragmas
, &ns_name
);
949 id
= VEC_length (pragma_ns_name
, registered_pp_pragmas
);
950 id
+= PRAGMA_FIRST_EXTERNAL
- 1;
954 VEC_safe_push (pragma_handler
, heap
, registered_pragmas
, &handler
);
955 id
= VEC_length (pragma_handler
, registered_pragmas
);
956 id
+= PRAGMA_FIRST_EXTERNAL
- 1;
958 /* The C++ front end allocates 6 bits in cp_token; the C front end
959 allocates 7 bits in c_token. At present this is sufficient. */
960 gcc_assert (id
< 64);
963 cpp_register_deferred_pragma (parse_in
, space
, name
, id
,
964 allow_expansion
, false);
968 c_register_pragma (const char *space
, const char *name
, pragma_handler handler
)
970 c_register_pragma_1 (space
, name
, handler
, false);
974 c_register_pragma_with_expansion (const char *space
, const char *name
,
975 pragma_handler handler
)
977 c_register_pragma_1 (space
, name
, handler
, true);
981 c_invoke_pragma_handler (unsigned int id
)
983 pragma_handler handler
;
985 id
-= PRAGMA_FIRST_EXTERNAL
;
986 handler
= *VEC_index (pragma_handler
, registered_pragmas
, id
);
991 /* Set up front-end pragmas. */
997 const int n_omp_pragmas
= sizeof (omp_pragmas
) / sizeof (*omp_pragmas
);
1000 for (i
= 0; i
< n_omp_pragmas
; ++i
)
1001 cpp_register_deferred_pragma (parse_in
, "omp", omp_pragmas
[i
].name
,
1002 omp_pragmas
[i
].id
, true, true);
1005 if (!flag_preprocess_only
)
1006 cpp_register_deferred_pragma (parse_in
, "GCC", "pch_preprocess",
1007 PRAGMA_GCC_PCH_PREPROCESS
, false, false);
1009 #ifdef HANDLE_PRAGMA_PACK
1010 #ifdef HANDLE_PRAGMA_PACK_WITH_EXPANSION
1011 c_register_pragma_with_expansion (0, "pack", handle_pragma_pack
);
1013 c_register_pragma (0, "pack", handle_pragma_pack
);
1016 #ifdef HANDLE_PRAGMA_PUSH_POP_MACRO
1017 c_register_pragma (0 ,"push_macro", handle_pragma_push_macro
);
1018 c_register_pragma (0 ,"pop_macro", handle_pragma_pop_macro
);
1020 #ifdef HANDLE_PRAGMA_WEAK
1021 c_register_pragma (0, "weak", handle_pragma_weak
);
1023 #ifdef HANDLE_PRAGMA_VISIBILITY
1024 c_register_pragma ("GCC", "visibility", handle_pragma_visibility
);
1027 c_register_pragma ("GCC", "diagnostic", handle_pragma_diagnostic
);
1029 c_register_pragma_with_expansion (0, "redefine_extname", handle_pragma_redefine_extname
);
1030 c_register_pragma (0, "extern_prefix", handle_pragma_extern_prefix
);
1032 #ifdef REGISTER_TARGET_PRAGMAS
1033 REGISTER_TARGET_PRAGMAS ();
1037 #include "gt-c-pragma.h"