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
*const a
= (const struct def_pragma_macro
*) pa
,
274 *const b
= (const struct def_pragma_macro
*) pb
;
275 return a
->hash
== b
->hash
&& strcmp (a
->name
, b
->name
) == 0;
278 /* #pragma push_macro("MACRO_NAME")
279 #pragma pop_macro("MACRO_NAME") */
282 handle_pragma_push_macro (cpp_reader
*reader
)
285 enum cpp_ttype token
;
286 struct def_pragma_macro dummy
, *c
;
287 const char *macroname
;
290 if (pragma_lex (&x
) != CPP_OPEN_PAREN
)
291 GCC_BAD ("missing %<(%> after %<#pragma push_macro%> - ignored");
293 token
= pragma_lex (&id
);
295 /* Silently ignore */
296 if (token
== CPP_CLOSE_PAREN
)
298 if (token
!= CPP_STRING
)
299 GCC_BAD ("invalid constant in %<#pragma push_macro%> - ignored");
301 if (pragma_lex (&x
) != CPP_CLOSE_PAREN
)
302 GCC_BAD ("missing %<)%> after %<#pragma push_macro%> - ignored");
304 if (pragma_lex (&x
) != CPP_EOF
)
305 warning (OPT_Wpragmas
, "junk at end of %<#pragma push_macro%>");
307 /* Check for empty string, and silently ignore. */
308 if (TREE_STRING_LENGTH (id
) < 1)
310 macroname
= TREE_STRING_POINTER (id
);
312 if (pushed_macro_table
== NULL
)
313 pushed_macro_table
= htab_create_ggc (15, dpm_hash
, dpm_eq
, 0);
315 dummy
.hash
= htab_hash_string (macroname
);
316 dummy
.name
= macroname
;
317 slot
= htab_find_slot_with_hash (pushed_macro_table
, &dummy
,
319 c
= (struct def_pragma_macro
*) *slot
;
322 *slot
= c
= GGC_NEW (struct def_pragma_macro
);
323 c
->hash
= dummy
.hash
;
324 c
->name
= ggc_alloc_string (macroname
, TREE_STRING_LENGTH (id
) - 1);
325 c
->value
.prev
= NULL
;
329 struct def_pragma_macro_value
*v
;
330 v
= GGC_NEW (struct def_pragma_macro_value
);
335 c
->value
.value
= cpp_push_definition (reader
, macroname
);
339 handle_pragma_pop_macro (cpp_reader
*reader
)
342 enum cpp_ttype token
;
343 struct def_pragma_macro dummy
, *c
;
344 const char *macroname
;
347 if (pragma_lex (&x
) != CPP_OPEN_PAREN
)
348 GCC_BAD ("missing %<(%> after %<#pragma pop_macro%> - ignored");
350 token
= pragma_lex (&id
);
352 /* Silently ignore */
353 if (token
== CPP_CLOSE_PAREN
)
355 if (token
!= CPP_STRING
)
356 GCC_BAD ("invalid constant in %<#pragma pop_macro%> - ignored");
358 if (pragma_lex (&x
) != CPP_CLOSE_PAREN
)
359 GCC_BAD ("missing %<)%> after %<#pragma pop_macro%> - ignored");
361 if (pragma_lex (&x
) != CPP_EOF
)
362 warning (OPT_Wpragmas
, "junk at end of %<#pragma pop_macro%>");
364 /* Check for empty string, and silently ignore. */
365 if (TREE_STRING_LENGTH (id
) < 1)
367 macroname
= TREE_STRING_POINTER (id
);
369 dummy
.hash
= htab_hash_string (macroname
);
370 dummy
.name
= macroname
;
371 if (pushed_macro_table
)
372 slot
= htab_find_slot_with_hash (pushed_macro_table
, &dummy
,
373 dummy
.hash
, NO_INSERT
);
376 c
= (struct def_pragma_macro
*) *slot
;
378 cpp_pop_definition (reader
, c
->name
, c
->value
.value
);
381 c
->value
= *c
->value
.prev
;
383 htab_clear_slot (pushed_macro_table
, slot
);
385 #endif /* HANDLE_PRAGMA_PUSH_POP_MACRO */
387 static GTY(()) tree pending_weaks
;
389 #ifdef HANDLE_PRAGMA_WEAK
390 static void apply_pragma_weak (tree
, tree
);
391 static void handle_pragma_weak (cpp_reader
*);
394 apply_pragma_weak (tree decl
, tree value
)
398 value
= build_string (IDENTIFIER_LENGTH (value
),
399 IDENTIFIER_POINTER (value
));
400 decl_attributes (&decl
, build_tree_list (get_identifier ("alias"),
401 build_tree_list (NULL
, value
)),
405 if (SUPPORTS_WEAK
&& DECL_EXTERNAL (decl
) && TREE_USED (decl
)
406 && !DECL_WEAK (decl
) /* Don't complain about a redundant #pragma. */
407 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
408 warning (OPT_Wpragmas
, "applying #pragma weak %q+D after first use "
409 "results in unspecified behavior", decl
);
415 maybe_apply_pragma_weak (tree decl
)
419 /* Avoid asking for DECL_ASSEMBLER_NAME when it's not needed. */
421 /* No weak symbols pending, take the short-cut. */
424 /* If it's not visible outside this file, it doesn't matter whether
426 if (!DECL_EXTERNAL (decl
) && !TREE_PUBLIC (decl
))
428 /* If it's not a function or a variable, it can't be weak.
429 FIXME: what kinds of things are visible outside this file but
430 aren't functions or variables? Should this be an assert instead? */
431 if (TREE_CODE (decl
) != FUNCTION_DECL
&& TREE_CODE (decl
) != VAR_DECL
)
434 id
= DECL_ASSEMBLER_NAME (decl
);
436 for (p
= &pending_weaks
; (t
= *p
) ; p
= &TREE_CHAIN (t
))
437 if (id
== TREE_PURPOSE (t
))
439 apply_pragma_weak (decl
, TREE_VALUE (t
));
445 /* Process all "#pragma weak A = B" directives where we have not seen
448 maybe_apply_pending_pragma_weaks (void)
450 tree
*p
, t
, alias_id
, id
, decl
, *next
;
452 for (p
= &pending_weaks
; (t
= *p
) ; p
= next
)
454 next
= &TREE_CHAIN (t
);
455 alias_id
= TREE_PURPOSE (t
);
458 if (TREE_VALUE (t
) == NULL
)
461 decl
= build_decl (FUNCTION_DECL
, alias_id
, default_function_type
);
463 DECL_ARTIFICIAL (decl
) = 1;
464 TREE_PUBLIC (decl
) = 1;
465 DECL_EXTERNAL (decl
) = 1;
466 DECL_WEAK (decl
) = 1;
468 assemble_alias (decl
, id
);
472 /* #pragma weak name [= value] */
474 handle_pragma_weak (cpp_reader
* ARG_UNUSED (dummy
))
476 tree name
, value
, x
, decl
;
481 if (pragma_lex (&name
) != CPP_NAME
)
482 GCC_BAD ("malformed #pragma weak, ignored");
486 if (pragma_lex (&value
) != CPP_NAME
)
487 GCC_BAD ("malformed #pragma weak, ignored");
491 warning (OPT_Wpragmas
, "junk at end of %<#pragma weak%>");
493 decl
= identifier_global_value (name
);
494 if (decl
&& DECL_P (decl
))
496 apply_pragma_weak (decl
, value
);
498 assemble_alias (decl
, value
);
501 pending_weaks
= tree_cons (name
, value
, pending_weaks
);
505 maybe_apply_pragma_weak (tree
ARG_UNUSED (decl
))
510 maybe_apply_pending_pragma_weaks (void)
513 #endif /* HANDLE_PRAGMA_WEAK */
515 /* GCC supports two #pragma directives for renaming the external
516 symbol associated with a declaration (DECL_ASSEMBLER_NAME), for
517 compatibility with the Solaris and Tru64 system headers. GCC also
518 has its own notation for this, __asm__("name") annotations.
520 Corner cases of these features and their interaction:
522 1) Both pragmas silently apply only to declarations with external
523 linkage (that is, TREE_PUBLIC || DECL_EXTERNAL). Asm labels
524 do not have this restriction.
526 2) In C++, both #pragmas silently apply only to extern "C" declarations.
527 Asm labels do not have this restriction.
529 3) If any of the three ways of changing DECL_ASSEMBLER_NAME is
530 applied to a decl whose DECL_ASSEMBLER_NAME is already set, and the
531 new name is different, a warning issues and the name does not change.
533 4) The "source name" for #pragma redefine_extname is the DECL_NAME,
534 *not* the DECL_ASSEMBLER_NAME.
536 5) If #pragma extern_prefix is in effect and a declaration occurs
537 with an __asm__ name, the #pragma extern_prefix is silently
538 ignored for that declaration.
540 6) If #pragma extern_prefix and #pragma redefine_extname apply to
541 the same declaration, whichever triggered first wins, and a warning
542 is issued. (We would like to have #pragma redefine_extname always
543 win, but it can appear either before or after the declaration, and
544 if it appears afterward, we have no way of knowing whether a modified
545 DECL_ASSEMBLER_NAME is due to #pragma extern_prefix.) */
547 static GTY(()) tree pending_redefine_extname
;
549 static void handle_pragma_redefine_extname (cpp_reader
*);
551 /* #pragma redefine_extname oldname newname */
553 handle_pragma_redefine_extname (cpp_reader
* ARG_UNUSED (dummy
))
555 tree oldname
, newname
, decl
, x
;
558 if (pragma_lex (&oldname
) != CPP_NAME
)
559 GCC_BAD ("malformed #pragma redefine_extname, ignored");
560 if (pragma_lex (&newname
) != CPP_NAME
)
561 GCC_BAD ("malformed #pragma redefine_extname, ignored");
564 warning (OPT_Wpragmas
, "junk at end of %<#pragma redefine_extname%>");
566 if (!flag_mudflap
&& !targetm
.handle_pragma_redefine_extname
)
568 if (warn_unknown_pragmas
> in_system_header
)
569 warning (OPT_Wunknown_pragmas
,
570 "#pragma redefine_extname not supported on this target");
574 decl
= identifier_global_value (oldname
);
576 && (TREE_PUBLIC (decl
) || DECL_EXTERNAL (decl
))
577 && (TREE_CODE (decl
) == FUNCTION_DECL
578 || TREE_CODE (decl
) == VAR_DECL
)
579 && has_c_linkage (decl
))
581 if (DECL_ASSEMBLER_NAME_SET_P (decl
))
583 const char *name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
584 name
= targetm
.strip_name_encoding (name
);
586 if (strcmp (name
, IDENTIFIER_POINTER (newname
)))
587 warning (OPT_Wpragmas
, "#pragma redefine_extname ignored due to "
588 "conflict with previous rename");
591 change_decl_assembler_name (decl
, newname
);
594 /* We have to add this to the rename list even if there's already
595 a global value that doesn't meet the above criteria, because in
596 C++ "struct foo {...};" puts "foo" in the current namespace but
597 does *not* conflict with a subsequent declaration of a function
598 or variable foo. See g++.dg/other/pragma-re-2.C. */
599 add_to_renaming_pragma_list (oldname
, newname
);
602 /* This is called from here and from ia64.c. */
604 add_to_renaming_pragma_list (tree oldname
, tree newname
)
606 tree previous
= purpose_member (oldname
, pending_redefine_extname
);
609 if (TREE_VALUE (previous
) != newname
)
610 warning (OPT_Wpragmas
, "#pragma redefine_extname ignored due to "
611 "conflict with previous #pragma redefine_extname");
615 pending_redefine_extname
616 = tree_cons (oldname
, newname
, pending_redefine_extname
);
619 static GTY(()) tree pragma_extern_prefix
;
621 /* #pragma extern_prefix "prefix" */
623 handle_pragma_extern_prefix (cpp_reader
* ARG_UNUSED (dummy
))
628 if (pragma_lex (&prefix
) != CPP_STRING
)
629 GCC_BAD ("malformed #pragma extern_prefix, ignored");
632 warning (OPT_Wpragmas
, "junk at end of %<#pragma extern_prefix%>");
634 if (targetm
.handle_pragma_extern_prefix
)
635 /* Note that the length includes the null terminator. */
636 pragma_extern_prefix
= (TREE_STRING_LENGTH (prefix
) > 1 ? prefix
: NULL
);
637 else if (warn_unknown_pragmas
> in_system_header
)
638 warning (OPT_Wunknown_pragmas
,
639 "#pragma extern_prefix not supported on this target");
642 /* Hook from the front ends to apply the results of one of the preceding
643 pragmas that rename variables. */
646 maybe_apply_renaming_pragma (tree decl
, tree asmname
)
650 /* The renaming pragmas are only applied to declarations with
652 if ((TREE_CODE (decl
) != FUNCTION_DECL
&& TREE_CODE (decl
) != VAR_DECL
)
653 || (!TREE_PUBLIC (decl
) && !DECL_EXTERNAL (decl
))
654 || !has_c_linkage (decl
))
657 /* If the DECL_ASSEMBLER_NAME is already set, it does not change,
658 but we may warn about a rename that conflicts. */
659 if (DECL_ASSEMBLER_NAME_SET_P (decl
))
661 const char *oldname
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
662 oldname
= targetm
.strip_name_encoding (oldname
);
664 if (asmname
&& strcmp (TREE_STRING_POINTER (asmname
), oldname
))
665 warning (OPT_Wpragmas
, "asm declaration ignored due to "
666 "conflict with previous rename");
668 /* Take any pending redefine_extname off the list. */
669 for (p
= &pending_redefine_extname
; (t
= *p
); p
= &TREE_CHAIN (t
))
670 if (DECL_NAME (decl
) == TREE_PURPOSE (t
))
672 /* Only warn if there is a conflict. */
673 if (strcmp (IDENTIFIER_POINTER (TREE_VALUE (t
)), oldname
))
674 warning (OPT_Wpragmas
, "#pragma redefine_extname ignored due to "
675 "conflict with previous rename");
683 /* Find out if we have a pending #pragma redefine_extname. */
684 for (p
= &pending_redefine_extname
; (t
= *p
); p
= &TREE_CHAIN (t
))
685 if (DECL_NAME (decl
) == TREE_PURPOSE (t
))
687 tree newname
= TREE_VALUE (t
);
690 /* If we already have an asmname, #pragma redefine_extname is
691 ignored (with a warning if it conflicts). */
694 if (strcmp (TREE_STRING_POINTER (asmname
),
695 IDENTIFIER_POINTER (newname
)) != 0)
696 warning (OPT_Wpragmas
, "#pragma redefine_extname ignored due to "
697 "conflict with __asm__ declaration");
701 /* Otherwise we use what we've got; #pragma extern_prefix is
703 return build_string (IDENTIFIER_LENGTH (newname
),
704 IDENTIFIER_POINTER (newname
));
707 /* If we've got an asmname, #pragma extern_prefix is silently ignored. */
711 /* If #pragma extern_prefix is in effect, apply it. */
712 if (pragma_extern_prefix
)
714 const char *prefix
= TREE_STRING_POINTER (pragma_extern_prefix
);
715 size_t plen
= TREE_STRING_LENGTH (pragma_extern_prefix
) - 1;
717 const char *id
= IDENTIFIER_POINTER (DECL_NAME (decl
));
718 size_t ilen
= IDENTIFIER_LENGTH (DECL_NAME (decl
));
720 char *newname
= (char *) alloca (plen
+ ilen
+ 1);
722 memcpy (newname
, prefix
, plen
);
723 memcpy (newname
+ plen
, id
, ilen
+ 1);
725 return build_string (plen
+ ilen
, newname
);
733 #ifdef HANDLE_PRAGMA_VISIBILITY
734 static void handle_pragma_visibility (cpp_reader
*);
736 typedef enum symbol_visibility visibility
;
737 DEF_VEC_I (visibility
);
738 DEF_VEC_ALLOC_I (visibility
, heap
);
739 static VEC (visibility
, heap
) *visstack
;
741 /* Push the visibility indicated by STR onto the top of the #pragma
745 push_visibility (const char *str
)
747 VEC_safe_push (visibility
, heap
, visstack
,
749 if (!strcmp (str
, "default"))
750 default_visibility
= VISIBILITY_DEFAULT
;
751 else if (!strcmp (str
, "internal"))
752 default_visibility
= VISIBILITY_INTERNAL
;
753 else if (!strcmp (str
, "hidden"))
754 default_visibility
= VISIBILITY_HIDDEN
;
755 else if (!strcmp (str
, "protected"))
756 default_visibility
= VISIBILITY_PROTECTED
;
758 GCC_BAD ("#pragma GCC visibility push() must specify default, internal, hidden or protected");
759 visibility_options
.inpragma
= 1;
762 /* Pop a level of the #pragma visibility stack. */
765 pop_visibility (void)
767 default_visibility
= VEC_pop (visibility
, visstack
);
768 visibility_options
.inpragma
769 = VEC_length (visibility
, visstack
) != 0;
772 /* Sets the default visibility for symbols to something other than that
773 specified on the command line. */
776 handle_pragma_visibility (cpp_reader
*dummy ATTRIBUTE_UNUSED
)
778 /* Form is #pragma GCC visibility push(hidden)|pop */
780 enum cpp_ttype token
;
781 enum { bad
, push
, pop
} action
= bad
;
783 token
= pragma_lex (&x
);
784 if (token
== CPP_NAME
)
786 const char *op
= IDENTIFIER_POINTER (x
);
787 if (!strcmp (op
, "push"))
789 else if (!strcmp (op
, "pop"))
793 GCC_BAD ("#pragma GCC visibility must be followed by push or pop");
798 if (!VEC_length (visibility
, visstack
))
799 GCC_BAD ("no matching push for %<#pragma GCC visibility pop%>");
805 if (pragma_lex (&x
) != CPP_OPEN_PAREN
)
806 GCC_BAD ("missing %<(%> after %<#pragma GCC visibility push%> - ignored");
807 token
= pragma_lex (&x
);
808 if (token
!= CPP_NAME
)
809 GCC_BAD ("malformed #pragma GCC visibility push");
811 push_visibility (IDENTIFIER_POINTER (x
));
812 if (pragma_lex (&x
) != CPP_CLOSE_PAREN
)
813 GCC_BAD ("missing %<(%> after %<#pragma GCC visibility push%> - ignored");
816 if (pragma_lex (&x
) != CPP_EOF
)
817 warning (OPT_Wpragmas
, "junk at end of %<#pragma GCC visibility%>");
823 handle_pragma_diagnostic(cpp_reader
*ARG_UNUSED(dummy
))
825 const char *kind_string
, *option_string
;
826 unsigned int option_index
;
827 enum cpp_ttype token
;
833 error ("#pragma GCC diagnostic not allowed inside functions");
837 token
= pragma_lex (&x
);
838 if (token
!= CPP_NAME
)
839 GCC_BAD ("missing [error|warning|ignored] after %<#pragma GCC diagnostic%>");
840 kind_string
= IDENTIFIER_POINTER (x
);
841 if (strcmp (kind_string
, "error") == 0)
843 else if (strcmp (kind_string
, "warning") == 0)
845 else if (strcmp (kind_string
, "ignored") == 0)
848 GCC_BAD ("expected [error|warning|ignored] after %<#pragma GCC diagnostic%>");
850 token
= pragma_lex (&x
);
851 if (token
!= CPP_STRING
)
852 GCC_BAD ("missing option after %<#pragma GCC diagnostic%> kind");
853 option_string
= TREE_STRING_POINTER (x
);
854 for (option_index
= 0; option_index
< cl_options_count
; option_index
++)
855 if (strcmp (cl_options
[option_index
].opt_text
, option_string
) == 0)
857 /* This overrides -Werror, for example. */
858 diagnostic_classify_diagnostic (global_dc
, option_index
, kind
);
859 /* This makes sure the option is enabled, like -Wfoo would do. */
860 if (cl_options
[option_index
].var_type
== CLVC_BOOLEAN
861 && cl_options
[option_index
].flag_var
862 && kind
!= DK_IGNORED
)
863 *(int *) cl_options
[option_index
].flag_var
= 1;
866 GCC_BAD ("unknown option after %<#pragma GCC diagnostic%> kind");
869 /* A vector of registered pragma callbacks. */
871 DEF_VEC_O (pragma_handler
);
872 DEF_VEC_ALLOC_O (pragma_handler
, heap
);
874 static VEC(pragma_handler
, heap
) *registered_pragmas
;
882 DEF_VEC_O (pragma_ns_name
);
883 DEF_VEC_ALLOC_O (pragma_ns_name
, heap
);
885 static VEC(pragma_ns_name
, heap
) *registered_pp_pragmas
;
887 struct omp_pragma_def
{ const char *name
; unsigned int id
; };
888 static const struct omp_pragma_def omp_pragmas
[] = {
889 { "atomic", PRAGMA_OMP_ATOMIC
},
890 { "barrier", PRAGMA_OMP_BARRIER
},
891 { "critical", PRAGMA_OMP_CRITICAL
},
892 { "flush", PRAGMA_OMP_FLUSH
},
893 { "for", PRAGMA_OMP_FOR
},
894 { "master", PRAGMA_OMP_MASTER
},
895 { "ordered", PRAGMA_OMP_ORDERED
},
896 { "parallel", PRAGMA_OMP_PARALLEL
},
897 { "section", PRAGMA_OMP_SECTION
},
898 { "sections", PRAGMA_OMP_SECTIONS
},
899 { "single", PRAGMA_OMP_SINGLE
},
900 { "task", PRAGMA_OMP_TASK
},
901 { "taskwait", PRAGMA_OMP_TASKWAIT
},
902 { "threadprivate", PRAGMA_OMP_THREADPRIVATE
}
906 c_pp_lookup_pragma (unsigned int id
, const char **space
, const char **name
)
908 const int n_omp_pragmas
= sizeof (omp_pragmas
) / sizeof (*omp_pragmas
);
911 for (i
= 0; i
< n_omp_pragmas
; ++i
)
912 if (omp_pragmas
[i
].id
== id
)
915 *name
= omp_pragmas
[i
].name
;
919 if (id
>= PRAGMA_FIRST_EXTERNAL
920 && (id
< PRAGMA_FIRST_EXTERNAL
921 + VEC_length (pragma_ns_name
, registered_pp_pragmas
)))
923 *space
= VEC_index (pragma_ns_name
, registered_pp_pragmas
,
924 id
- PRAGMA_FIRST_EXTERNAL
)->space
;
925 *name
= VEC_index (pragma_ns_name
, registered_pp_pragmas
,
926 id
- PRAGMA_FIRST_EXTERNAL
)->name
;
933 /* Front-end wrappers for pragma registration to avoid dragging
934 cpplib.h in almost everywhere. */
937 c_register_pragma_1 (const char *space
, const char *name
,
938 pragma_handler handler
, bool allow_expansion
)
942 if (flag_preprocess_only
)
944 pragma_ns_name ns_name
;
946 if (!allow_expansion
)
949 ns_name
.space
= space
;
951 VEC_safe_push (pragma_ns_name
, heap
, registered_pp_pragmas
, &ns_name
);
952 id
= VEC_length (pragma_ns_name
, registered_pp_pragmas
);
953 id
+= PRAGMA_FIRST_EXTERNAL
- 1;
957 VEC_safe_push (pragma_handler
, heap
, registered_pragmas
, &handler
);
958 id
= VEC_length (pragma_handler
, registered_pragmas
);
959 id
+= PRAGMA_FIRST_EXTERNAL
- 1;
961 /* The C++ front end allocates 6 bits in cp_token; the C front end
962 allocates 7 bits in c_token. At present this is sufficient. */
963 gcc_assert (id
< 64);
966 cpp_register_deferred_pragma (parse_in
, space
, name
, id
,
967 allow_expansion
, false);
971 c_register_pragma (const char *space
, const char *name
, pragma_handler handler
)
973 c_register_pragma_1 (space
, name
, handler
, false);
977 c_register_pragma_with_expansion (const char *space
, const char *name
,
978 pragma_handler handler
)
980 c_register_pragma_1 (space
, name
, handler
, true);
984 c_invoke_pragma_handler (unsigned int id
)
986 pragma_handler handler
;
988 id
-= PRAGMA_FIRST_EXTERNAL
;
989 handler
= *VEC_index (pragma_handler
, registered_pragmas
, id
);
994 /* Set up front-end pragmas. */
1000 const int n_omp_pragmas
= sizeof (omp_pragmas
) / sizeof (*omp_pragmas
);
1003 for (i
= 0; i
< n_omp_pragmas
; ++i
)
1004 cpp_register_deferred_pragma (parse_in
, "omp", omp_pragmas
[i
].name
,
1005 omp_pragmas
[i
].id
, true, true);
1008 if (!flag_preprocess_only
)
1009 cpp_register_deferred_pragma (parse_in
, "GCC", "pch_preprocess",
1010 PRAGMA_GCC_PCH_PREPROCESS
, false, false);
1012 #ifdef HANDLE_PRAGMA_PACK
1013 #ifdef HANDLE_PRAGMA_PACK_WITH_EXPANSION
1014 c_register_pragma_with_expansion (0, "pack", handle_pragma_pack
);
1016 c_register_pragma (0, "pack", handle_pragma_pack
);
1019 #ifdef HANDLE_PRAGMA_PUSH_POP_MACRO
1020 c_register_pragma (0 ,"push_macro", handle_pragma_push_macro
);
1021 c_register_pragma (0 ,"pop_macro", handle_pragma_pop_macro
);
1023 #ifdef HANDLE_PRAGMA_WEAK
1024 c_register_pragma (0, "weak", handle_pragma_weak
);
1026 #ifdef HANDLE_PRAGMA_VISIBILITY
1027 c_register_pragma ("GCC", "visibility", handle_pragma_visibility
);
1030 c_register_pragma ("GCC", "diagnostic", handle_pragma_diagnostic
);
1032 c_register_pragma_with_expansion (0, "redefine_extname", handle_pragma_redefine_extname
);
1033 c_register_pragma (0, "extern_prefix", handle_pragma_extern_prefix
);
1035 #ifdef REGISTER_TARGET_PRAGMAS
1036 REGISTER_TARGET_PRAGMAS ();
1040 #include "gt-c-pragma.h"