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 GTY(()) align_stack
{
49 struct align_stack
* prev
;
52 static GTY(()) struct align_stack
* alignment_stack
;
54 #ifdef HANDLE_PRAGMA_PACK
55 static void handle_pragma_pack (cpp_reader
*);
57 #ifdef HANDLE_PRAGMA_PACK_PUSH_POP
58 /* If we have a "global" #pragma pack(<n>) in effect when the first
59 #pragma pack(push,<n>) is encountered, this stores the value of
60 maximum_field_alignment in effect. When the final pop_alignment()
61 happens, we restore the value to this, not to a value of 0 for
62 maximum_field_alignment. Value is in bits. */
63 static int default_alignment
;
64 #define SET_GLOBAL_ALIGNMENT(ALIGN) (maximum_field_alignment = *(alignment_stack == NULL \
65 ? &default_alignment \
66 : &alignment_stack->alignment) = (ALIGN))
68 static void push_alignment (int, tree
);
69 static void pop_alignment (tree
);
71 /* Push an alignment value onto the stack. */
73 push_alignment (int alignment
, tree id
)
77 entry
= GGC_NEW (align_stack
);
79 entry
->alignment
= alignment
;
81 entry
->prev
= alignment_stack
;
83 /* The current value of maximum_field_alignment is not necessarily
84 0 since there may be a #pragma pack(<n>) in effect; remember it
85 so that we can restore it after the final #pragma pop(). */
86 if (alignment_stack
== NULL
)
87 default_alignment
= maximum_field_alignment
;
89 alignment_stack
= entry
;
91 maximum_field_alignment
= alignment
;
94 /* Undo a push of an alignment onto the stack. */
96 pop_alignment (tree id
)
100 if (alignment_stack
== NULL
)
101 GCC_BAD ("#pragma pack (pop) encountered without matching #pragma pack (push)");
103 /* If we got an identifier, strip away everything above the target
104 entry so that the next step will restore the state just below it. */
107 for (entry
= alignment_stack
; entry
; entry
= entry
->prev
)
110 alignment_stack
= entry
;
114 warning (OPT_Wpragmas
, "\
115 #pragma pack(pop, %s) encountered without matching #pragma pack(push, %s)"
116 , IDENTIFIER_POINTER (id
), IDENTIFIER_POINTER (id
));
119 entry
= alignment_stack
->prev
;
121 maximum_field_alignment
= entry
? entry
->alignment
: default_alignment
;
123 alignment_stack
= entry
;
125 #else /* not HANDLE_PRAGMA_PACK_PUSH_POP */
126 #define SET_GLOBAL_ALIGNMENT(ALIGN) (maximum_field_alignment = (ALIGN))
127 #define push_alignment(ID, N) \
128 GCC_BAD ("#pragma pack(push[, id], <n>) is not supported on this target")
129 #define pop_alignment(ID) \
130 GCC_BAD ("#pragma pack(pop[, id], <n>) is not supported on this target")
131 #endif /* HANDLE_PRAGMA_PACK_PUSH_POP */
137 #pragma pack (push, N)
138 #pragma pack (push, ID)
139 #pragma pack (push, ID, N)
141 #pragma pack (pop, ID) */
143 handle_pragma_pack (cpp_reader
* ARG_UNUSED (dummy
))
147 enum cpp_ttype token
;
148 enum { set
, push
, pop
} action
;
150 if (pragma_lex (&x
) != CPP_OPEN_PAREN
)
151 GCC_BAD ("missing %<(%> after %<#pragma pack%> - ignored");
153 token
= pragma_lex (&x
);
154 if (token
== CPP_CLOSE_PAREN
)
157 align
= initial_max_fld_align
;
159 else if (token
== CPP_NUMBER
)
161 if (TREE_CODE (x
) != INTEGER_CST
)
162 GCC_BAD ("invalid constant in %<#pragma pack%> - ignored");
163 align
= TREE_INT_CST_LOW (x
);
165 if (pragma_lex (&x
) != CPP_CLOSE_PAREN
)
166 GCC_BAD ("malformed %<#pragma pack%> - ignored");
168 else if (token
== CPP_NAME
)
170 #define GCC_BAD_ACTION do { if (action != pop) \
171 GCC_BAD ("malformed %<#pragma pack(push[, id][, <n>])%> - ignored"); \
173 GCC_BAD ("malformed %<#pragma pack(pop[, id])%> - ignored"); \
176 const char *op
= IDENTIFIER_POINTER (x
);
177 if (!strcmp (op
, "push"))
179 else if (!strcmp (op
, "pop"))
182 GCC_BAD2 ("unknown action %qs for %<#pragma pack%> - ignored", op
);
184 while ((token
= pragma_lex (&x
)) == CPP_COMMA
)
186 token
= pragma_lex (&x
);
187 if (token
== CPP_NAME
&& id
== 0)
191 else if (token
== CPP_NUMBER
&& action
== push
&& align
== -1)
193 if (TREE_CODE (x
) != INTEGER_CST
)
194 GCC_BAD ("invalid constant in %<#pragma pack%> - ignored");
195 align
= TREE_INT_CST_LOW (x
);
203 if (token
!= CPP_CLOSE_PAREN
)
205 #undef GCC_BAD_ACTION
208 GCC_BAD ("malformed %<#pragma pack%> - ignored");
210 if (pragma_lex (&x
) != CPP_EOF
)
211 warning (OPT_Wpragmas
, "junk at end of %<#pragma pack%>");
213 if (flag_pack_struct
)
214 GCC_BAD ("#pragma pack has no effect with -fpack-struct - ignored");
225 align
*= BITS_PER_UNIT
;
230 align
= maximum_field_alignment
;
234 GCC_BAD2 ("alignment must be a small power of two, not %d", align
);
239 case set
: SET_GLOBAL_ALIGNMENT (align
); break;
240 case push
: push_alignment (align
, id
); break;
241 case pop
: pop_alignment (id
); break;
244 #endif /* HANDLE_PRAGMA_PACK */
246 struct GTY(()) def_pragma_macro_value
{
247 struct def_pragma_macro_value
*prev
;
251 struct GTY(()) def_pragma_macro
{
254 struct def_pragma_macro_value value
;
257 static GTY((param_is (struct def_pragma_macro
))) htab_t pushed_macro_table
;
259 #ifdef HANDLE_PRAGMA_PUSH_POP_MACRO
260 /* Hash table control functions for pushed_macro_table. */
262 dpm_hash (const void *p
)
264 return ((const struct def_pragma_macro
*)p
)->hash
;
268 dpm_eq (const void *pa
, const void *pb
)
270 const struct def_pragma_macro
*const a
= (const struct def_pragma_macro
*) pa
,
271 *const b
= (const struct def_pragma_macro
*) pb
;
272 return a
->hash
== b
->hash
&& strcmp (a
->name
, b
->name
) == 0;
275 /* #pragma push_macro("MACRO_NAME")
276 #pragma pop_macro("MACRO_NAME") */
279 handle_pragma_push_macro (cpp_reader
*reader
)
282 enum cpp_ttype token
;
283 struct def_pragma_macro dummy
, *c
;
284 const char *macroname
;
287 if (pragma_lex (&x
) != CPP_OPEN_PAREN
)
288 GCC_BAD ("missing %<(%> after %<#pragma push_macro%> - ignored");
290 token
= pragma_lex (&id
);
292 /* Silently ignore */
293 if (token
== CPP_CLOSE_PAREN
)
295 if (token
!= CPP_STRING
)
296 GCC_BAD ("invalid constant in %<#pragma push_macro%> - ignored");
298 if (pragma_lex (&x
) != CPP_CLOSE_PAREN
)
299 GCC_BAD ("missing %<)%> after %<#pragma push_macro%> - ignored");
301 if (pragma_lex (&x
) != CPP_EOF
)
302 warning (OPT_Wpragmas
, "junk at end of %<#pragma push_macro%>");
304 /* Check for empty string, and silently ignore. */
305 if (TREE_STRING_LENGTH (id
) < 1)
307 macroname
= TREE_STRING_POINTER (id
);
309 if (pushed_macro_table
== NULL
)
310 pushed_macro_table
= htab_create_ggc (15, dpm_hash
, dpm_eq
, 0);
312 dummy
.hash
= htab_hash_string (macroname
);
313 dummy
.name
= macroname
;
314 slot
= htab_find_slot_with_hash (pushed_macro_table
, &dummy
,
316 c
= (struct def_pragma_macro
*) *slot
;
319 *slot
= c
= GGC_NEW (struct def_pragma_macro
);
320 c
->hash
= dummy
.hash
;
321 c
->name
= ggc_alloc_string (macroname
, TREE_STRING_LENGTH (id
) - 1);
322 c
->value
.prev
= NULL
;
326 struct def_pragma_macro_value
*v
;
327 v
= GGC_NEW (struct def_pragma_macro_value
);
332 c
->value
.value
= cpp_push_definition (reader
, macroname
);
336 handle_pragma_pop_macro (cpp_reader
*reader
)
339 enum cpp_ttype token
;
340 struct def_pragma_macro dummy
, *c
;
341 const char *macroname
;
344 if (pragma_lex (&x
) != CPP_OPEN_PAREN
)
345 GCC_BAD ("missing %<(%> after %<#pragma pop_macro%> - ignored");
347 token
= pragma_lex (&id
);
349 /* Silently ignore */
350 if (token
== CPP_CLOSE_PAREN
)
352 if (token
!= CPP_STRING
)
353 GCC_BAD ("invalid constant in %<#pragma pop_macro%> - ignored");
355 if (pragma_lex (&x
) != CPP_CLOSE_PAREN
)
356 GCC_BAD ("missing %<)%> after %<#pragma pop_macro%> - ignored");
358 if (pragma_lex (&x
) != CPP_EOF
)
359 warning (OPT_Wpragmas
, "junk at end of %<#pragma pop_macro%>");
361 /* Check for empty string, and silently ignore. */
362 if (TREE_STRING_LENGTH (id
) < 1)
364 macroname
= TREE_STRING_POINTER (id
);
366 dummy
.hash
= htab_hash_string (macroname
);
367 dummy
.name
= macroname
;
368 if (pushed_macro_table
)
369 slot
= htab_find_slot_with_hash (pushed_macro_table
, &dummy
,
370 dummy
.hash
, NO_INSERT
);
373 c
= (struct def_pragma_macro
*) *slot
;
375 cpp_pop_definition (reader
, c
->name
, c
->value
.value
);
378 c
->value
= *c
->value
.prev
;
380 htab_clear_slot (pushed_macro_table
, slot
);
382 #endif /* HANDLE_PRAGMA_PUSH_POP_MACRO */
384 static GTY(()) tree pending_weaks
;
386 #ifdef HANDLE_PRAGMA_WEAK
387 static void apply_pragma_weak (tree
, tree
);
388 static void handle_pragma_weak (cpp_reader
*);
391 apply_pragma_weak (tree decl
, tree value
)
395 value
= build_string (IDENTIFIER_LENGTH (value
),
396 IDENTIFIER_POINTER (value
));
397 decl_attributes (&decl
, build_tree_list (get_identifier ("alias"),
398 build_tree_list (NULL
, value
)),
402 if (SUPPORTS_WEAK
&& DECL_EXTERNAL (decl
) && TREE_USED (decl
)
403 && !DECL_WEAK (decl
) /* Don't complain about a redundant #pragma. */
404 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
405 warning (OPT_Wpragmas
, "applying #pragma weak %q+D after first use "
406 "results in unspecified behavior", decl
);
412 maybe_apply_pragma_weak (tree decl
)
416 /* Avoid asking for DECL_ASSEMBLER_NAME when it's not needed. */
418 /* No weak symbols pending, take the short-cut. */
421 /* If it's not visible outside this file, it doesn't matter whether
423 if (!DECL_EXTERNAL (decl
) && !TREE_PUBLIC (decl
))
425 /* If it's not a function or a variable, it can't be weak.
426 FIXME: what kinds of things are visible outside this file but
427 aren't functions or variables? Should this be an assert instead? */
428 if (TREE_CODE (decl
) != FUNCTION_DECL
&& TREE_CODE (decl
) != VAR_DECL
)
431 id
= DECL_ASSEMBLER_NAME (decl
);
433 for (p
= &pending_weaks
; (t
= *p
) ; p
= &TREE_CHAIN (t
))
434 if (id
== TREE_PURPOSE (t
))
436 apply_pragma_weak (decl
, TREE_VALUE (t
));
442 /* Process all "#pragma weak A = B" directives where we have not seen
445 maybe_apply_pending_pragma_weaks (void)
447 tree
*p
, t
, alias_id
, id
, decl
, *next
;
449 for (p
= &pending_weaks
; (t
= *p
) ; p
= next
)
451 next
= &TREE_CHAIN (t
);
452 alias_id
= TREE_PURPOSE (t
);
455 if (TREE_VALUE (t
) == NULL
)
458 decl
= build_decl (FUNCTION_DECL
, alias_id
, default_function_type
);
460 DECL_ARTIFICIAL (decl
) = 1;
461 TREE_PUBLIC (decl
) = 1;
462 DECL_EXTERNAL (decl
) = 1;
463 DECL_WEAK (decl
) = 1;
465 assemble_alias (decl
, id
);
469 /* #pragma weak name [= value] */
471 handle_pragma_weak (cpp_reader
* ARG_UNUSED (dummy
))
473 tree name
, value
, x
, decl
;
478 if (pragma_lex (&name
) != CPP_NAME
)
479 GCC_BAD ("malformed #pragma weak, ignored");
483 if (pragma_lex (&value
) != CPP_NAME
)
484 GCC_BAD ("malformed #pragma weak, ignored");
488 warning (OPT_Wpragmas
, "junk at end of %<#pragma weak%>");
490 decl
= identifier_global_value (name
);
491 if (decl
&& DECL_P (decl
))
493 apply_pragma_weak (decl
, value
);
495 assemble_alias (decl
, value
);
498 pending_weaks
= tree_cons (name
, value
, pending_weaks
);
502 maybe_apply_pragma_weak (tree
ARG_UNUSED (decl
))
507 maybe_apply_pending_pragma_weaks (void)
510 #endif /* HANDLE_PRAGMA_WEAK */
512 /* GCC supports two #pragma directives for renaming the external
513 symbol associated with a declaration (DECL_ASSEMBLER_NAME), for
514 compatibility with the Solaris and Tru64 system headers. GCC also
515 has its own notation for this, __asm__("name") annotations.
517 Corner cases of these features and their interaction:
519 1) Both pragmas silently apply only to declarations with external
520 linkage (that is, TREE_PUBLIC || DECL_EXTERNAL). Asm labels
521 do not have this restriction.
523 2) In C++, both #pragmas silently apply only to extern "C" declarations.
524 Asm labels do not have this restriction.
526 3) If any of the three ways of changing DECL_ASSEMBLER_NAME is
527 applied to a decl whose DECL_ASSEMBLER_NAME is already set, and the
528 new name is different, a warning issues and the name does not change.
530 4) The "source name" for #pragma redefine_extname is the DECL_NAME,
531 *not* the DECL_ASSEMBLER_NAME.
533 5) If #pragma extern_prefix is in effect and a declaration occurs
534 with an __asm__ name, the #pragma extern_prefix is silently
535 ignored for that declaration.
537 6) If #pragma extern_prefix and #pragma redefine_extname apply to
538 the same declaration, whichever triggered first wins, and a warning
539 is issued. (We would like to have #pragma redefine_extname always
540 win, but it can appear either before or after the declaration, and
541 if it appears afterward, we have no way of knowing whether a modified
542 DECL_ASSEMBLER_NAME is due to #pragma extern_prefix.) */
544 static GTY(()) tree pending_redefine_extname
;
546 static void handle_pragma_redefine_extname (cpp_reader
*);
548 /* #pragma redefine_extname oldname newname */
550 handle_pragma_redefine_extname (cpp_reader
* ARG_UNUSED (dummy
))
552 tree oldname
, newname
, decl
, x
;
555 if (pragma_lex (&oldname
) != CPP_NAME
)
556 GCC_BAD ("malformed #pragma redefine_extname, ignored");
557 if (pragma_lex (&newname
) != CPP_NAME
)
558 GCC_BAD ("malformed #pragma redefine_extname, ignored");
561 warning (OPT_Wpragmas
, "junk at end of %<#pragma redefine_extname%>");
563 if (!flag_mudflap
&& !targetm
.handle_pragma_redefine_extname
)
565 if (warn_unknown_pragmas
> in_system_header
)
566 warning (OPT_Wunknown_pragmas
,
567 "#pragma redefine_extname not supported on this target");
571 decl
= identifier_global_value (oldname
);
573 && (TREE_PUBLIC (decl
) || DECL_EXTERNAL (decl
))
574 && (TREE_CODE (decl
) == FUNCTION_DECL
575 || TREE_CODE (decl
) == VAR_DECL
)
576 && has_c_linkage (decl
))
578 if (DECL_ASSEMBLER_NAME_SET_P (decl
))
580 const char *name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
581 name
= targetm
.strip_name_encoding (name
);
583 if (strcmp (name
, IDENTIFIER_POINTER (newname
)))
584 warning (OPT_Wpragmas
, "#pragma redefine_extname ignored due to "
585 "conflict with previous rename");
588 change_decl_assembler_name (decl
, newname
);
591 /* We have to add this to the rename list even if there's already
592 a global value that doesn't meet the above criteria, because in
593 C++ "struct foo {...};" puts "foo" in the current namespace but
594 does *not* conflict with a subsequent declaration of a function
595 or variable foo. See g++.dg/other/pragma-re-2.C. */
596 add_to_renaming_pragma_list (oldname
, newname
);
599 /* This is called from here and from ia64.c. */
601 add_to_renaming_pragma_list (tree oldname
, tree newname
)
603 tree previous
= purpose_member (oldname
, pending_redefine_extname
);
606 if (TREE_VALUE (previous
) != newname
)
607 warning (OPT_Wpragmas
, "#pragma redefine_extname ignored due to "
608 "conflict with previous #pragma redefine_extname");
612 pending_redefine_extname
613 = tree_cons (oldname
, newname
, pending_redefine_extname
);
616 static GTY(()) tree pragma_extern_prefix
;
618 /* #pragma extern_prefix "prefix" */
620 handle_pragma_extern_prefix (cpp_reader
* ARG_UNUSED (dummy
))
625 if (pragma_lex (&prefix
) != CPP_STRING
)
626 GCC_BAD ("malformed #pragma extern_prefix, ignored");
629 warning (OPT_Wpragmas
, "junk at end of %<#pragma extern_prefix%>");
631 if (targetm
.handle_pragma_extern_prefix
)
632 /* Note that the length includes the null terminator. */
633 pragma_extern_prefix
= (TREE_STRING_LENGTH (prefix
) > 1 ? prefix
: NULL
);
634 else if (warn_unknown_pragmas
> in_system_header
)
635 warning (OPT_Wunknown_pragmas
,
636 "#pragma extern_prefix not supported on this target");
639 /* Hook from the front ends to apply the results of one of the preceding
640 pragmas that rename variables. */
643 maybe_apply_renaming_pragma (tree decl
, tree asmname
)
647 /* The renaming pragmas are only applied to declarations with
649 if ((TREE_CODE (decl
) != FUNCTION_DECL
&& TREE_CODE (decl
) != VAR_DECL
)
650 || (!TREE_PUBLIC (decl
) && !DECL_EXTERNAL (decl
))
651 || !has_c_linkage (decl
))
654 /* If the DECL_ASSEMBLER_NAME is already set, it does not change,
655 but we may warn about a rename that conflicts. */
656 if (DECL_ASSEMBLER_NAME_SET_P (decl
))
658 const char *oldname
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
659 oldname
= targetm
.strip_name_encoding (oldname
);
661 if (asmname
&& strcmp (TREE_STRING_POINTER (asmname
), oldname
))
662 warning (OPT_Wpragmas
, "asm declaration ignored due to "
663 "conflict with previous rename");
665 /* Take any pending redefine_extname off the list. */
666 for (p
= &pending_redefine_extname
; (t
= *p
); p
= &TREE_CHAIN (t
))
667 if (DECL_NAME (decl
) == TREE_PURPOSE (t
))
669 /* Only warn if there is a conflict. */
670 if (strcmp (IDENTIFIER_POINTER (TREE_VALUE (t
)), oldname
))
671 warning (OPT_Wpragmas
, "#pragma redefine_extname ignored due to "
672 "conflict with previous rename");
680 /* Find out if we have a pending #pragma redefine_extname. */
681 for (p
= &pending_redefine_extname
; (t
= *p
); p
= &TREE_CHAIN (t
))
682 if (DECL_NAME (decl
) == TREE_PURPOSE (t
))
684 tree newname
= TREE_VALUE (t
);
687 /* If we already have an asmname, #pragma redefine_extname is
688 ignored (with a warning if it conflicts). */
691 if (strcmp (TREE_STRING_POINTER (asmname
),
692 IDENTIFIER_POINTER (newname
)) != 0)
693 warning (OPT_Wpragmas
, "#pragma redefine_extname ignored due to "
694 "conflict with __asm__ declaration");
698 /* Otherwise we use what we've got; #pragma extern_prefix is
700 return build_string (IDENTIFIER_LENGTH (newname
),
701 IDENTIFIER_POINTER (newname
));
704 /* If we've got an asmname, #pragma extern_prefix is silently ignored. */
708 /* If #pragma extern_prefix is in effect, apply it. */
709 if (pragma_extern_prefix
)
711 const char *prefix
= TREE_STRING_POINTER (pragma_extern_prefix
);
712 size_t plen
= TREE_STRING_LENGTH (pragma_extern_prefix
) - 1;
714 const char *id
= IDENTIFIER_POINTER (DECL_NAME (decl
));
715 size_t ilen
= IDENTIFIER_LENGTH (DECL_NAME (decl
));
717 char *newname
= (char *) alloca (plen
+ ilen
+ 1);
719 memcpy (newname
, prefix
, plen
);
720 memcpy (newname
+ plen
, id
, ilen
+ 1);
722 return build_string (plen
+ ilen
, newname
);
730 #ifdef HANDLE_PRAGMA_VISIBILITY
731 static void handle_pragma_visibility (cpp_reader
*);
733 typedef enum symbol_visibility visibility
;
734 DEF_VEC_I (visibility
);
735 DEF_VEC_ALLOC_I (visibility
, heap
);
736 static VEC (visibility
, heap
) *visstack
;
738 /* Push the visibility indicated by STR onto the top of the #pragma
742 push_visibility (const char *str
)
744 VEC_safe_push (visibility
, heap
, visstack
,
746 if (!strcmp (str
, "default"))
747 default_visibility
= VISIBILITY_DEFAULT
;
748 else if (!strcmp (str
, "internal"))
749 default_visibility
= VISIBILITY_INTERNAL
;
750 else if (!strcmp (str
, "hidden"))
751 default_visibility
= VISIBILITY_HIDDEN
;
752 else if (!strcmp (str
, "protected"))
753 default_visibility
= VISIBILITY_PROTECTED
;
755 GCC_BAD ("#pragma GCC visibility push() must specify default, internal, hidden or protected");
756 visibility_options
.inpragma
= 1;
759 /* Pop a level of the #pragma visibility stack. */
762 pop_visibility (void)
764 default_visibility
= VEC_pop (visibility
, visstack
);
765 visibility_options
.inpragma
766 = VEC_length (visibility
, visstack
) != 0;
769 /* Sets the default visibility for symbols to something other than that
770 specified on the command line. */
773 handle_pragma_visibility (cpp_reader
*dummy ATTRIBUTE_UNUSED
)
775 /* Form is #pragma GCC visibility push(hidden)|pop */
777 enum cpp_ttype token
;
778 enum { bad
, push
, pop
} action
= bad
;
780 token
= pragma_lex (&x
);
781 if (token
== CPP_NAME
)
783 const char *op
= IDENTIFIER_POINTER (x
);
784 if (!strcmp (op
, "push"))
786 else if (!strcmp (op
, "pop"))
790 GCC_BAD ("#pragma GCC visibility must be followed by push or pop");
795 if (!VEC_length (visibility
, visstack
))
796 GCC_BAD ("no matching push for %<#pragma GCC visibility pop%>");
802 if (pragma_lex (&x
) != CPP_OPEN_PAREN
)
803 GCC_BAD ("missing %<(%> after %<#pragma GCC visibility push%> - ignored");
804 token
= pragma_lex (&x
);
805 if (token
!= CPP_NAME
)
806 GCC_BAD ("malformed #pragma GCC visibility push");
808 push_visibility (IDENTIFIER_POINTER (x
));
809 if (pragma_lex (&x
) != CPP_CLOSE_PAREN
)
810 GCC_BAD ("missing %<(%> after %<#pragma GCC visibility push%> - ignored");
813 if (pragma_lex (&x
) != CPP_EOF
)
814 warning (OPT_Wpragmas
, "junk at end of %<#pragma GCC visibility%>");
820 handle_pragma_diagnostic(cpp_reader
*ARG_UNUSED(dummy
))
822 const char *kind_string
, *option_string
;
823 unsigned int option_index
;
824 enum cpp_ttype token
;
830 error ("#pragma GCC diagnostic not allowed inside functions");
834 token
= pragma_lex (&x
);
835 if (token
!= CPP_NAME
)
836 GCC_BAD ("missing [error|warning|ignored] after %<#pragma GCC diagnostic%>");
837 kind_string
= IDENTIFIER_POINTER (x
);
838 if (strcmp (kind_string
, "error") == 0)
840 else if (strcmp (kind_string
, "warning") == 0)
842 else if (strcmp (kind_string
, "ignored") == 0)
845 GCC_BAD ("expected [error|warning|ignored] after %<#pragma GCC diagnostic%>");
847 token
= pragma_lex (&x
);
848 if (token
!= CPP_STRING
)
849 GCC_BAD ("missing option after %<#pragma GCC diagnostic%> kind");
850 option_string
= TREE_STRING_POINTER (x
);
851 for (option_index
= 0; option_index
< cl_options_count
; option_index
++)
852 if (strcmp (cl_options
[option_index
].opt_text
, option_string
) == 0)
854 /* This overrides -Werror, for example. */
855 diagnostic_classify_diagnostic (global_dc
, option_index
, kind
);
856 /* This makes sure the option is enabled, like -Wfoo would do. */
857 if (cl_options
[option_index
].var_type
== CLVC_BOOLEAN
858 && cl_options
[option_index
].flag_var
859 && kind
!= DK_IGNORED
)
860 *(int *) cl_options
[option_index
].flag_var
= 1;
863 GCC_BAD ("unknown option after %<#pragma GCC diagnostic%> kind");
866 /* Parse #pragma GCC target (xxx) to set target specific options. */
868 handle_pragma_target(cpp_reader
*ARG_UNUSED(dummy
))
870 enum cpp_ttype token
;
872 bool close_paren_needed_p
= false;
876 error ("#pragma GCC option is not allowed inside functions");
880 token
= pragma_lex (&x
);
881 if (token
== CPP_OPEN_PAREN
)
883 close_paren_needed_p
= true;
884 token
= pragma_lex (&x
);
887 if (token
!= CPP_STRING
)
889 GCC_BAD ("%<#pragma GCC option%> is not a string");
893 /* Strings are user options. */
896 tree args
= NULL_TREE
;
900 /* Build up the strings now as a tree linked list. Skip empty
902 if (TREE_STRING_LENGTH (x
) > 0)
903 args
= tree_cons (NULL_TREE
, x
, args
);
905 token
= pragma_lex (&x
);
906 while (token
== CPP_COMMA
)
907 token
= pragma_lex (&x
);
909 while (token
== CPP_STRING
);
911 if (close_paren_needed_p
)
913 if (token
== CPP_CLOSE_PAREN
)
914 token
= pragma_lex (&x
);
916 GCC_BAD ("%<#pragma GCC target (string [,string]...)%> does "
917 "not have a final %<)%>.");
920 if (token
!= CPP_EOF
)
922 error ("#pragma GCC target string... is badly formed");
926 /* put arguments in the order the user typed them. */
927 args
= nreverse (args
);
929 if (targetm
.target_option
.pragma_parse (args
, NULL_TREE
))
930 current_target_pragma
= args
;
934 /* Handle #pragma GCC optimize to set optimization options. */
936 handle_pragma_optimize (cpp_reader
*ARG_UNUSED(dummy
))
938 enum cpp_ttype token
;
940 bool close_paren_needed_p
= false;
941 tree optimization_previous_node
= optimization_current_node
;
945 error ("#pragma GCC optimize is not allowed inside functions");
949 token
= pragma_lex (&x
);
950 if (token
== CPP_OPEN_PAREN
)
952 close_paren_needed_p
= true;
953 token
= pragma_lex (&x
);
956 if (token
!= CPP_STRING
&& token
!= CPP_NUMBER
)
958 GCC_BAD ("%<#pragma GCC optimize%> is not a string or number");
962 /* Strings/numbers are user options. */
965 tree args
= NULL_TREE
;
969 /* Build up the numbers/strings now as a list. */
970 if (token
!= CPP_STRING
|| TREE_STRING_LENGTH (x
) > 0)
971 args
= tree_cons (NULL_TREE
, x
, args
);
973 token
= pragma_lex (&x
);
974 while (token
== CPP_COMMA
)
975 token
= pragma_lex (&x
);
977 while (token
== CPP_STRING
|| token
== CPP_NUMBER
);
979 if (close_paren_needed_p
)
981 if (token
== CPP_CLOSE_PAREN
)
982 token
= pragma_lex (&x
);
984 GCC_BAD ("%<#pragma GCC optimize (string [,string]...)%> does "
985 "not have a final %<)%>.");
988 if (token
!= CPP_EOF
)
990 error ("#pragma GCC optimize string... is badly formed");
994 /* put arguments in the order the user typed them. */
995 args
= nreverse (args
);
997 parse_optimize_options (args
, false);
998 current_optimize_pragma
= chainon (current_optimize_pragma
, args
);
999 optimization_current_node
= build_optimization_node ();
1000 c_cpp_builtins_optimize_pragma (parse_in
,
1001 optimization_previous_node
,
1002 optimization_current_node
);
1006 /* Stack of the #pragma GCC options created with #pragma GCC push_option. Save
1007 both the binary representation of the options and the TREE_LIST of
1008 strings that will be added to the function's attribute list. */
1009 typedef struct GTY(()) opt_stack
{
1010 struct opt_stack
*prev
;
1012 tree target_strings
;
1013 tree optimize_binary
;
1014 tree optimize_strings
;
1017 static GTY(()) struct opt_stack
* options_stack
;
1019 /* Handle #pragma GCC push_options to save the current target and optimization
1023 handle_pragma_push_options (cpp_reader
*ARG_UNUSED(dummy
))
1025 enum cpp_ttype token
;
1029 token
= pragma_lex (&x
);
1030 if (token
!= CPP_EOF
)
1032 warning (OPT_Wpragmas
, "junk at end of %<#pragma push_options%>");
1036 p
= GGC_NEW (opt_stack
);
1037 p
->prev
= options_stack
;
1040 /* Save optimization and target flags in binary format. */
1041 p
->optimize_binary
= build_optimization_node ();
1042 p
->target_binary
= build_target_option_node ();
1044 /* Save optimization and target flags in string list format. */
1045 p
->optimize_strings
= copy_list (current_optimize_pragma
);
1046 p
->target_strings
= copy_list (current_target_pragma
);
1049 /* Handle #pragma GCC pop_options to restore the current target and
1050 optimization options from a previous push_options. */
1053 handle_pragma_pop_options (cpp_reader
*ARG_UNUSED(dummy
))
1055 enum cpp_ttype token
;
1059 token
= pragma_lex (&x
);
1060 if (token
!= CPP_EOF
)
1062 warning (OPT_Wpragmas
, "junk at end of %<#pragma pop_options%>");
1066 if (! options_stack
)
1068 warning (OPT_Wpragmas
,
1069 "%<#pragma GCC pop_options%> without a corresponding "
1070 "%<#pragma GCC push_options%>");
1075 options_stack
= p
->prev
;
1077 if (p
->target_binary
!= target_option_current_node
)
1079 (void) targetm
.target_option
.pragma_parse (NULL_TREE
, p
->target_binary
);
1080 target_option_current_node
= p
->target_binary
;
1083 if (p
->optimize_binary
!= optimization_current_node
)
1085 tree old_optimize
= optimization_current_node
;
1086 cl_optimization_restore (TREE_OPTIMIZATION (p
->optimize_binary
));
1087 c_cpp_builtins_optimize_pragma (parse_in
, old_optimize
,
1088 p
->optimize_binary
);
1089 optimization_current_node
= p
->optimize_binary
;
1092 current_target_pragma
= p
->target_strings
;
1093 current_optimize_pragma
= p
->optimize_strings
;
1096 /* Handle #pragma GCC reset_options to restore the current target and
1097 optimization options to the original options used on the command line. */
1100 handle_pragma_reset_options (cpp_reader
*ARG_UNUSED(dummy
))
1102 enum cpp_ttype token
;
1104 tree new_optimize
= optimization_default_node
;
1105 tree new_target
= target_option_default_node
;
1107 token
= pragma_lex (&x
);
1108 if (token
!= CPP_EOF
)
1110 warning (OPT_Wpragmas
, "junk at end of %<#pragma reset_options%>");
1114 if (new_target
!= target_option_current_node
)
1116 (void) targetm
.target_option
.pragma_parse (NULL_TREE
, new_target
);
1117 target_option_current_node
= new_target
;
1120 if (new_optimize
!= optimization_current_node
)
1122 tree old_optimize
= optimization_current_node
;
1123 cl_optimization_restore (TREE_OPTIMIZATION (new_optimize
));
1124 c_cpp_builtins_optimize_pragma (parse_in
, old_optimize
, new_optimize
);
1125 optimization_current_node
= new_optimize
;
1128 current_target_pragma
= NULL_TREE
;
1129 current_optimize_pragma
= NULL_TREE
;
1132 /* Print a plain user-specified message. */
1135 handle_pragma_message (cpp_reader
*ARG_UNUSED(dummy
))
1137 enum cpp_ttype token
;
1138 tree x
, message
= 0;
1140 token
= pragma_lex (&x
);
1141 if (token
== CPP_OPEN_PAREN
)
1143 token
= pragma_lex (&x
);
1144 if (token
== CPP_STRING
)
1147 GCC_BAD ("expected a string after %<#pragma message%>");
1148 if (pragma_lex (&x
) != CPP_CLOSE_PAREN
)
1149 GCC_BAD ("malformed %<#pragma message%>, ignored");
1151 else if (token
== CPP_STRING
)
1154 GCC_BAD ("expected a string after %<#pragma message%>");
1156 gcc_assert (message
);
1158 if (pragma_lex (&x
) != CPP_EOF
)
1159 warning (OPT_Wpragmas
, "junk at end of %<#pragma message%>");
1161 if (TREE_STRING_LENGTH (message
) > 1)
1162 inform (input_location
, "#pragma message: %s", TREE_STRING_POINTER (message
));
1165 /* A vector of registered pragma callbacks. */
1167 DEF_VEC_O (pragma_handler
);
1168 DEF_VEC_ALLOC_O (pragma_handler
, heap
);
1170 static VEC(pragma_handler
, heap
) *registered_pragmas
;
1178 DEF_VEC_O (pragma_ns_name
);
1179 DEF_VEC_ALLOC_O (pragma_ns_name
, heap
);
1181 static VEC(pragma_ns_name
, heap
) *registered_pp_pragmas
;
1183 struct omp_pragma_def
{ const char *name
; unsigned int id
; };
1184 static const struct omp_pragma_def omp_pragmas
[] = {
1185 { "atomic", PRAGMA_OMP_ATOMIC
},
1186 { "barrier", PRAGMA_OMP_BARRIER
},
1187 { "critical", PRAGMA_OMP_CRITICAL
},
1188 { "flush", PRAGMA_OMP_FLUSH
},
1189 { "for", PRAGMA_OMP_FOR
},
1190 { "master", PRAGMA_OMP_MASTER
},
1191 { "ordered", PRAGMA_OMP_ORDERED
},
1192 { "parallel", PRAGMA_OMP_PARALLEL
},
1193 { "section", PRAGMA_OMP_SECTION
},
1194 { "sections", PRAGMA_OMP_SECTIONS
},
1195 { "single", PRAGMA_OMP_SINGLE
},
1196 { "task", PRAGMA_OMP_TASK
},
1197 { "taskwait", PRAGMA_OMP_TASKWAIT
},
1198 { "threadprivate", PRAGMA_OMP_THREADPRIVATE
}
1202 c_pp_lookup_pragma (unsigned int id
, const char **space
, const char **name
)
1204 const int n_omp_pragmas
= sizeof (omp_pragmas
) / sizeof (*omp_pragmas
);
1207 for (i
= 0; i
< n_omp_pragmas
; ++i
)
1208 if (omp_pragmas
[i
].id
== id
)
1211 *name
= omp_pragmas
[i
].name
;
1215 if (id
>= PRAGMA_FIRST_EXTERNAL
1216 && (id
< PRAGMA_FIRST_EXTERNAL
1217 + VEC_length (pragma_ns_name
, registered_pp_pragmas
)))
1219 *space
= VEC_index (pragma_ns_name
, registered_pp_pragmas
,
1220 id
- PRAGMA_FIRST_EXTERNAL
)->space
;
1221 *name
= VEC_index (pragma_ns_name
, registered_pp_pragmas
,
1222 id
- PRAGMA_FIRST_EXTERNAL
)->name
;
1229 /* Front-end wrappers for pragma registration to avoid dragging
1230 cpplib.h in almost everywhere. */
1233 c_register_pragma_1 (const char *space
, const char *name
,
1234 pragma_handler handler
, bool allow_expansion
)
1238 if (flag_preprocess_only
)
1240 pragma_ns_name ns_name
;
1242 if (!allow_expansion
)
1245 ns_name
.space
= space
;
1246 ns_name
.name
= name
;
1247 VEC_safe_push (pragma_ns_name
, heap
, registered_pp_pragmas
, &ns_name
);
1248 id
= VEC_length (pragma_ns_name
, registered_pp_pragmas
);
1249 id
+= PRAGMA_FIRST_EXTERNAL
- 1;
1253 VEC_safe_push (pragma_handler
, heap
, registered_pragmas
, &handler
);
1254 id
= VEC_length (pragma_handler
, registered_pragmas
);
1255 id
+= PRAGMA_FIRST_EXTERNAL
- 1;
1257 /* The C++ front end allocates 6 bits in cp_token; the C front end
1258 allocates 7 bits in c_token. At present this is sufficient. */
1259 gcc_assert (id
< 64);
1262 cpp_register_deferred_pragma (parse_in
, space
, name
, id
,
1263 allow_expansion
, false);
1267 c_register_pragma (const char *space
, const char *name
, pragma_handler handler
)
1269 c_register_pragma_1 (space
, name
, handler
, false);
1273 c_register_pragma_with_expansion (const char *space
, const char *name
,
1274 pragma_handler handler
)
1276 c_register_pragma_1 (space
, name
, handler
, true);
1280 c_invoke_pragma_handler (unsigned int id
)
1282 pragma_handler handler
;
1284 id
-= PRAGMA_FIRST_EXTERNAL
;
1285 handler
= *VEC_index (pragma_handler
, registered_pragmas
, id
);
1290 /* Set up front-end pragmas. */
1296 const int n_omp_pragmas
= sizeof (omp_pragmas
) / sizeof (*omp_pragmas
);
1299 for (i
= 0; i
< n_omp_pragmas
; ++i
)
1300 cpp_register_deferred_pragma (parse_in
, "omp", omp_pragmas
[i
].name
,
1301 omp_pragmas
[i
].id
, true, true);
1304 if (!flag_preprocess_only
)
1305 cpp_register_deferred_pragma (parse_in
, "GCC", "pch_preprocess",
1306 PRAGMA_GCC_PCH_PREPROCESS
, false, false);
1308 #ifdef HANDLE_PRAGMA_PACK
1309 #ifdef HANDLE_PRAGMA_PACK_WITH_EXPANSION
1310 c_register_pragma_with_expansion (0, "pack", handle_pragma_pack
);
1312 c_register_pragma (0, "pack", handle_pragma_pack
);
1315 #ifdef HANDLE_PRAGMA_PUSH_POP_MACRO
1316 c_register_pragma (0 ,"push_macro", handle_pragma_push_macro
);
1317 c_register_pragma (0 ,"pop_macro", handle_pragma_pop_macro
);
1319 #ifdef HANDLE_PRAGMA_WEAK
1320 c_register_pragma (0, "weak", handle_pragma_weak
);
1322 #ifdef HANDLE_PRAGMA_VISIBILITY
1323 c_register_pragma ("GCC", "visibility", handle_pragma_visibility
);
1326 c_register_pragma ("GCC", "diagnostic", handle_pragma_diagnostic
);
1327 c_register_pragma ("GCC", "target", handle_pragma_target
);
1328 c_register_pragma ("GCC", "optimize", handle_pragma_optimize
);
1329 c_register_pragma ("GCC", "push_options", handle_pragma_push_options
);
1330 c_register_pragma ("GCC", "pop_options", handle_pragma_pop_options
);
1331 c_register_pragma ("GCC", "reset_options", handle_pragma_reset_options
);
1333 c_register_pragma_with_expansion (0, "redefine_extname", handle_pragma_redefine_extname
);
1334 c_register_pragma (0, "extern_prefix", handle_pragma_extern_prefix
);
1336 c_register_pragma_with_expansion (0, "message", handle_pragma_message
);
1338 #ifdef REGISTER_TARGET_PRAGMAS
1339 REGISTER_TARGET_PRAGMAS ();
1343 #include "gt-c-pragma.h"