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, %E) encountered without matching #pragma pack(push, %E)"
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 %qE for %<#pragma pack%> - ignored", x
);
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 (UNKNOWN_LOCATION
,
459 FUNCTION_DECL
, alias_id
, default_function_type
);
461 DECL_ARTIFICIAL (decl
) = 1;
462 TREE_PUBLIC (decl
) = 1;
463 DECL_EXTERNAL (decl
) = 1;
464 DECL_WEAK (decl
) = 1;
466 assemble_alias (decl
, id
);
470 /* #pragma weak name [= value] */
472 handle_pragma_weak (cpp_reader
* ARG_UNUSED (dummy
))
474 tree name
, value
, x
, decl
;
479 if (pragma_lex (&name
) != CPP_NAME
)
480 GCC_BAD ("malformed #pragma weak, ignored");
484 if (pragma_lex (&value
) != CPP_NAME
)
485 GCC_BAD ("malformed #pragma weak, ignored");
489 warning (OPT_Wpragmas
, "junk at end of %<#pragma weak%>");
491 decl
= identifier_global_value (name
);
492 if (decl
&& DECL_P (decl
))
494 apply_pragma_weak (decl
, value
);
496 assemble_alias (decl
, value
);
499 pending_weaks
= tree_cons (name
, value
, pending_weaks
);
503 maybe_apply_pragma_weak (tree
ARG_UNUSED (decl
))
508 maybe_apply_pending_pragma_weaks (void)
511 #endif /* HANDLE_PRAGMA_WEAK */
513 /* GCC supports two #pragma directives for renaming the external
514 symbol associated with a declaration (DECL_ASSEMBLER_NAME), for
515 compatibility with the Solaris and Tru64 system headers. GCC also
516 has its own notation for this, __asm__("name") annotations.
518 Corner cases of these features and their interaction:
520 1) Both pragmas silently apply only to declarations with external
521 linkage (that is, TREE_PUBLIC || DECL_EXTERNAL). Asm labels
522 do not have this restriction.
524 2) In C++, both #pragmas silently apply only to extern "C" declarations.
525 Asm labels do not have this restriction.
527 3) If any of the three ways of changing DECL_ASSEMBLER_NAME is
528 applied to a decl whose DECL_ASSEMBLER_NAME is already set, and the
529 new name is different, a warning issues and the name does not change.
531 4) The "source name" for #pragma redefine_extname is the DECL_NAME,
532 *not* the DECL_ASSEMBLER_NAME.
534 5) If #pragma extern_prefix is in effect and a declaration occurs
535 with an __asm__ name, the #pragma extern_prefix is silently
536 ignored for that declaration.
538 6) If #pragma extern_prefix and #pragma redefine_extname apply to
539 the same declaration, whichever triggered first wins, and a warning
540 is issued. (We would like to have #pragma redefine_extname always
541 win, but it can appear either before or after the declaration, and
542 if it appears afterward, we have no way of knowing whether a modified
543 DECL_ASSEMBLER_NAME is due to #pragma extern_prefix.) */
545 static GTY(()) tree pending_redefine_extname
;
547 static void handle_pragma_redefine_extname (cpp_reader
*);
549 /* #pragma redefine_extname oldname newname */
551 handle_pragma_redefine_extname (cpp_reader
* ARG_UNUSED (dummy
))
553 tree oldname
, newname
, decl
, x
;
556 if (pragma_lex (&oldname
) != CPP_NAME
)
557 GCC_BAD ("malformed #pragma redefine_extname, ignored");
558 if (pragma_lex (&newname
) != CPP_NAME
)
559 GCC_BAD ("malformed #pragma redefine_extname, ignored");
562 warning (OPT_Wpragmas
, "junk at end of %<#pragma redefine_extname%>");
564 if (!flag_mudflap
&& !targetm
.handle_pragma_redefine_extname
)
566 if (warn_unknown_pragmas
> in_system_header
)
567 warning (OPT_Wunknown_pragmas
,
568 "#pragma redefine_extname not supported on this target");
572 decl
= identifier_global_value (oldname
);
574 && (TREE_PUBLIC (decl
) || DECL_EXTERNAL (decl
))
575 && (TREE_CODE (decl
) == FUNCTION_DECL
576 || TREE_CODE (decl
) == VAR_DECL
)
577 && has_c_linkage (decl
))
579 if (DECL_ASSEMBLER_NAME_SET_P (decl
))
581 const char *name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
582 name
= targetm
.strip_name_encoding (name
);
584 if (strcmp (name
, IDENTIFIER_POINTER (newname
)))
585 warning (OPT_Wpragmas
, "#pragma redefine_extname ignored due to "
586 "conflict with previous rename");
589 change_decl_assembler_name (decl
, newname
);
592 /* We have to add this to the rename list even if there's already
593 a global value that doesn't meet the above criteria, because in
594 C++ "struct foo {...};" puts "foo" in the current namespace but
595 does *not* conflict with a subsequent declaration of a function
596 or variable foo. See g++.dg/other/pragma-re-2.C. */
597 add_to_renaming_pragma_list (oldname
, newname
);
600 /* This is called from here and from ia64.c. */
602 add_to_renaming_pragma_list (tree oldname
, tree newname
)
604 tree previous
= purpose_member (oldname
, pending_redefine_extname
);
607 if (TREE_VALUE (previous
) != newname
)
608 warning (OPT_Wpragmas
, "#pragma redefine_extname ignored due to "
609 "conflict with previous #pragma redefine_extname");
613 pending_redefine_extname
614 = tree_cons (oldname
, newname
, pending_redefine_extname
);
617 static GTY(()) tree pragma_extern_prefix
;
619 /* #pragma extern_prefix "prefix" */
621 handle_pragma_extern_prefix (cpp_reader
* ARG_UNUSED (dummy
))
626 if (pragma_lex (&prefix
) != CPP_STRING
)
627 GCC_BAD ("malformed #pragma extern_prefix, ignored");
630 warning (OPT_Wpragmas
, "junk at end of %<#pragma extern_prefix%>");
632 if (targetm
.handle_pragma_extern_prefix
)
633 /* Note that the length includes the null terminator. */
634 pragma_extern_prefix
= (TREE_STRING_LENGTH (prefix
) > 1 ? prefix
: NULL
);
635 else if (warn_unknown_pragmas
> in_system_header
)
636 warning (OPT_Wunknown_pragmas
,
637 "#pragma extern_prefix not supported on this target");
640 /* Hook from the front ends to apply the results of one of the preceding
641 pragmas that rename variables. */
644 maybe_apply_renaming_pragma (tree decl
, tree asmname
)
648 /* The renaming pragmas are only applied to declarations with
650 if ((TREE_CODE (decl
) != FUNCTION_DECL
&& TREE_CODE (decl
) != VAR_DECL
)
651 || (!TREE_PUBLIC (decl
) && !DECL_EXTERNAL (decl
))
652 || !has_c_linkage (decl
))
655 /* If the DECL_ASSEMBLER_NAME is already set, it does not change,
656 but we may warn about a rename that conflicts. */
657 if (DECL_ASSEMBLER_NAME_SET_P (decl
))
659 const char *oldname
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
660 oldname
= targetm
.strip_name_encoding (oldname
);
662 if (asmname
&& strcmp (TREE_STRING_POINTER (asmname
), oldname
))
663 warning (OPT_Wpragmas
, "asm declaration ignored due to "
664 "conflict with previous rename");
666 /* Take any pending redefine_extname off the list. */
667 for (p
= &pending_redefine_extname
; (t
= *p
); p
= &TREE_CHAIN (t
))
668 if (DECL_NAME (decl
) == TREE_PURPOSE (t
))
670 /* Only warn if there is a conflict. */
671 if (strcmp (IDENTIFIER_POINTER (TREE_VALUE (t
)), oldname
))
672 warning (OPT_Wpragmas
, "#pragma redefine_extname ignored due to "
673 "conflict with previous rename");
681 /* Find out if we have a pending #pragma redefine_extname. */
682 for (p
= &pending_redefine_extname
; (t
= *p
); p
= &TREE_CHAIN (t
))
683 if (DECL_NAME (decl
) == TREE_PURPOSE (t
))
685 tree newname
= TREE_VALUE (t
);
688 /* If we already have an asmname, #pragma redefine_extname is
689 ignored (with a warning if it conflicts). */
692 if (strcmp (TREE_STRING_POINTER (asmname
),
693 IDENTIFIER_POINTER (newname
)) != 0)
694 warning (OPT_Wpragmas
, "#pragma redefine_extname ignored due to "
695 "conflict with __asm__ declaration");
699 /* Otherwise we use what we've got; #pragma extern_prefix is
701 return build_string (IDENTIFIER_LENGTH (newname
),
702 IDENTIFIER_POINTER (newname
));
705 /* If we've got an asmname, #pragma extern_prefix is silently ignored. */
709 /* If #pragma extern_prefix is in effect, apply it. */
710 if (pragma_extern_prefix
)
712 const char *prefix
= TREE_STRING_POINTER (pragma_extern_prefix
);
713 size_t plen
= TREE_STRING_LENGTH (pragma_extern_prefix
) - 1;
715 const char *id
= IDENTIFIER_POINTER (DECL_NAME (decl
));
716 size_t ilen
= IDENTIFIER_LENGTH (DECL_NAME (decl
));
718 char *newname
= (char *) alloca (plen
+ ilen
+ 1);
720 memcpy (newname
, prefix
, plen
);
721 memcpy (newname
+ plen
, id
, ilen
+ 1);
723 return build_string (plen
+ ilen
, newname
);
731 #ifdef HANDLE_PRAGMA_VISIBILITY
732 static void handle_pragma_visibility (cpp_reader
*);
734 typedef enum symbol_visibility visibility
;
735 DEF_VEC_I (visibility
);
736 DEF_VEC_ALLOC_I (visibility
, heap
);
737 static VEC (visibility
, heap
) *visstack
;
739 /* Push the visibility indicated by STR onto the top of the #pragma
743 push_visibility (const char *str
)
745 VEC_safe_push (visibility
, heap
, visstack
,
747 if (!strcmp (str
, "default"))
748 default_visibility
= VISIBILITY_DEFAULT
;
749 else if (!strcmp (str
, "internal"))
750 default_visibility
= VISIBILITY_INTERNAL
;
751 else if (!strcmp (str
, "hidden"))
752 default_visibility
= VISIBILITY_HIDDEN
;
753 else if (!strcmp (str
, "protected"))
754 default_visibility
= VISIBILITY_PROTECTED
;
756 GCC_BAD ("#pragma GCC visibility push() must specify default, internal, hidden or protected");
757 visibility_options
.inpragma
= 1;
760 /* Pop a level of the #pragma visibility stack. */
763 pop_visibility (void)
765 default_visibility
= VEC_pop (visibility
, visstack
);
766 visibility_options
.inpragma
767 = VEC_length (visibility
, visstack
) != 0;
770 /* Sets the default visibility for symbols to something other than that
771 specified on the command line. */
774 handle_pragma_visibility (cpp_reader
*dummy ATTRIBUTE_UNUSED
)
776 /* Form is #pragma GCC visibility push(hidden)|pop */
778 enum cpp_ttype token
;
779 enum { bad
, push
, pop
} action
= bad
;
781 token
= pragma_lex (&x
);
782 if (token
== CPP_NAME
)
784 const char *op
= IDENTIFIER_POINTER (x
);
785 if (!strcmp (op
, "push"))
787 else if (!strcmp (op
, "pop"))
791 GCC_BAD ("#pragma GCC visibility must be followed by push or pop");
796 if (!VEC_length (visibility
, visstack
))
797 GCC_BAD ("no matching push for %<#pragma GCC visibility pop%>");
803 if (pragma_lex (&x
) != CPP_OPEN_PAREN
)
804 GCC_BAD ("missing %<(%> after %<#pragma GCC visibility push%> - ignored");
805 token
= pragma_lex (&x
);
806 if (token
!= CPP_NAME
)
807 GCC_BAD ("malformed #pragma GCC visibility push");
809 push_visibility (IDENTIFIER_POINTER (x
));
810 if (pragma_lex (&x
) != CPP_CLOSE_PAREN
)
811 GCC_BAD ("missing %<(%> after %<#pragma GCC visibility push%> - ignored");
814 if (pragma_lex (&x
) != CPP_EOF
)
815 warning (OPT_Wpragmas
, "junk at end of %<#pragma GCC visibility%>");
821 handle_pragma_diagnostic(cpp_reader
*ARG_UNUSED(dummy
))
823 const char *kind_string
, *option_string
;
824 unsigned int option_index
;
825 enum cpp_ttype token
;
831 error ("#pragma GCC diagnostic not allowed inside functions");
835 token
= pragma_lex (&x
);
836 if (token
!= CPP_NAME
)
837 GCC_BAD ("missing [error|warning|ignored] after %<#pragma GCC diagnostic%>");
838 kind_string
= IDENTIFIER_POINTER (x
);
839 if (strcmp (kind_string
, "error") == 0)
841 else if (strcmp (kind_string
, "warning") == 0)
843 else if (strcmp (kind_string
, "ignored") == 0)
846 GCC_BAD ("expected [error|warning|ignored] after %<#pragma GCC diagnostic%>");
848 token
= pragma_lex (&x
);
849 if (token
!= CPP_STRING
)
850 GCC_BAD ("missing option after %<#pragma GCC diagnostic%> kind");
851 option_string
= TREE_STRING_POINTER (x
);
852 for (option_index
= 0; option_index
< cl_options_count
; option_index
++)
853 if (strcmp (cl_options
[option_index
].opt_text
, option_string
) == 0)
855 /* This overrides -Werror, for example. */
856 diagnostic_classify_diagnostic (global_dc
, option_index
, kind
);
857 /* This makes sure the option is enabled, like -Wfoo would do. */
858 if (cl_options
[option_index
].var_type
== CLVC_BOOLEAN
859 && cl_options
[option_index
].flag_var
860 && kind
!= DK_IGNORED
)
861 *(int *) cl_options
[option_index
].flag_var
= 1;
864 GCC_BAD ("unknown option after %<#pragma GCC diagnostic%> kind");
867 /* Parse #pragma GCC target (xxx) to set target specific options. */
869 handle_pragma_target(cpp_reader
*ARG_UNUSED(dummy
))
871 enum cpp_ttype token
;
873 bool close_paren_needed_p
= false;
877 error ("#pragma GCC option is not allowed inside functions");
881 token
= pragma_lex (&x
);
882 if (token
== CPP_OPEN_PAREN
)
884 close_paren_needed_p
= true;
885 token
= pragma_lex (&x
);
888 if (token
!= CPP_STRING
)
890 GCC_BAD ("%<#pragma GCC option%> is not a string");
894 /* Strings are user options. */
897 tree args
= NULL_TREE
;
901 /* Build up the strings now as a tree linked list. Skip empty
903 if (TREE_STRING_LENGTH (x
) > 0)
904 args
= tree_cons (NULL_TREE
, x
, args
);
906 token
= pragma_lex (&x
);
907 while (token
== CPP_COMMA
)
908 token
= pragma_lex (&x
);
910 while (token
== CPP_STRING
);
912 if (close_paren_needed_p
)
914 if (token
== CPP_CLOSE_PAREN
)
915 token
= pragma_lex (&x
);
917 GCC_BAD ("%<#pragma GCC target (string [,string]...)%> does "
918 "not have a final %<)%>.");
921 if (token
!= CPP_EOF
)
923 error ("#pragma GCC target string... is badly formed");
927 /* put arguments in the order the user typed them. */
928 args
= nreverse (args
);
930 if (targetm
.target_option
.pragma_parse (args
, NULL_TREE
))
931 current_target_pragma
= args
;
935 /* Handle #pragma GCC optimize to set optimization options. */
937 handle_pragma_optimize (cpp_reader
*ARG_UNUSED(dummy
))
939 enum cpp_ttype token
;
941 bool close_paren_needed_p
= false;
942 tree optimization_previous_node
= optimization_current_node
;
946 error ("#pragma GCC optimize is not allowed inside functions");
950 token
= pragma_lex (&x
);
951 if (token
== CPP_OPEN_PAREN
)
953 close_paren_needed_p
= true;
954 token
= pragma_lex (&x
);
957 if (token
!= CPP_STRING
&& token
!= CPP_NUMBER
)
959 GCC_BAD ("%<#pragma GCC optimize%> is not a string or number");
963 /* Strings/numbers are user options. */
966 tree args
= NULL_TREE
;
970 /* Build up the numbers/strings now as a list. */
971 if (token
!= CPP_STRING
|| TREE_STRING_LENGTH (x
) > 0)
972 args
= tree_cons (NULL_TREE
, x
, args
);
974 token
= pragma_lex (&x
);
975 while (token
== CPP_COMMA
)
976 token
= pragma_lex (&x
);
978 while (token
== CPP_STRING
|| token
== CPP_NUMBER
);
980 if (close_paren_needed_p
)
982 if (token
== CPP_CLOSE_PAREN
)
983 token
= pragma_lex (&x
);
985 GCC_BAD ("%<#pragma GCC optimize (string [,string]...)%> does "
986 "not have a final %<)%>.");
989 if (token
!= CPP_EOF
)
991 error ("#pragma GCC optimize string... is badly formed");
995 /* put arguments in the order the user typed them. */
996 args
= nreverse (args
);
998 parse_optimize_options (args
, false);
999 current_optimize_pragma
= chainon (current_optimize_pragma
, args
);
1000 optimization_current_node
= build_optimization_node ();
1001 c_cpp_builtins_optimize_pragma (parse_in
,
1002 optimization_previous_node
,
1003 optimization_current_node
);
1007 /* Stack of the #pragma GCC options created with #pragma GCC push_option. Save
1008 both the binary representation of the options and the TREE_LIST of
1009 strings that will be added to the function's attribute list. */
1010 typedef struct GTY(()) opt_stack
{
1011 struct opt_stack
*prev
;
1013 tree target_strings
;
1014 tree optimize_binary
;
1015 tree optimize_strings
;
1018 static GTY(()) struct opt_stack
* options_stack
;
1020 /* Handle #pragma GCC push_options to save the current target and optimization
1024 handle_pragma_push_options (cpp_reader
*ARG_UNUSED(dummy
))
1026 enum cpp_ttype token
;
1030 token
= pragma_lex (&x
);
1031 if (token
!= CPP_EOF
)
1033 warning (OPT_Wpragmas
, "junk at end of %<#pragma push_options%>");
1037 p
= GGC_NEW (opt_stack
);
1038 p
->prev
= options_stack
;
1041 /* Save optimization and target flags in binary format. */
1042 p
->optimize_binary
= build_optimization_node ();
1043 p
->target_binary
= build_target_option_node ();
1045 /* Save optimization and target flags in string list format. */
1046 p
->optimize_strings
= copy_list (current_optimize_pragma
);
1047 p
->target_strings
= copy_list (current_target_pragma
);
1050 /* Handle #pragma GCC pop_options to restore the current target and
1051 optimization options from a previous push_options. */
1054 handle_pragma_pop_options (cpp_reader
*ARG_UNUSED(dummy
))
1056 enum cpp_ttype token
;
1060 token
= pragma_lex (&x
);
1061 if (token
!= CPP_EOF
)
1063 warning (OPT_Wpragmas
, "junk at end of %<#pragma pop_options%>");
1067 if (! options_stack
)
1069 warning (OPT_Wpragmas
,
1070 "%<#pragma GCC pop_options%> without a corresponding "
1071 "%<#pragma GCC push_options%>");
1076 options_stack
= p
->prev
;
1078 if (p
->target_binary
!= target_option_current_node
)
1080 (void) targetm
.target_option
.pragma_parse (NULL_TREE
, p
->target_binary
);
1081 target_option_current_node
= p
->target_binary
;
1084 if (p
->optimize_binary
!= optimization_current_node
)
1086 tree old_optimize
= optimization_current_node
;
1087 cl_optimization_restore (TREE_OPTIMIZATION (p
->optimize_binary
));
1088 c_cpp_builtins_optimize_pragma (parse_in
, old_optimize
,
1089 p
->optimize_binary
);
1090 optimization_current_node
= p
->optimize_binary
;
1093 current_target_pragma
= p
->target_strings
;
1094 current_optimize_pragma
= p
->optimize_strings
;
1097 /* Handle #pragma GCC reset_options to restore the current target and
1098 optimization options to the original options used on the command line. */
1101 handle_pragma_reset_options (cpp_reader
*ARG_UNUSED(dummy
))
1103 enum cpp_ttype token
;
1105 tree new_optimize
= optimization_default_node
;
1106 tree new_target
= target_option_default_node
;
1108 token
= pragma_lex (&x
);
1109 if (token
!= CPP_EOF
)
1111 warning (OPT_Wpragmas
, "junk at end of %<#pragma reset_options%>");
1115 if (new_target
!= target_option_current_node
)
1117 (void) targetm
.target_option
.pragma_parse (NULL_TREE
, new_target
);
1118 target_option_current_node
= new_target
;
1121 if (new_optimize
!= optimization_current_node
)
1123 tree old_optimize
= optimization_current_node
;
1124 cl_optimization_restore (TREE_OPTIMIZATION (new_optimize
));
1125 c_cpp_builtins_optimize_pragma (parse_in
, old_optimize
, new_optimize
);
1126 optimization_current_node
= new_optimize
;
1129 current_target_pragma
= NULL_TREE
;
1130 current_optimize_pragma
= NULL_TREE
;
1133 /* Print a plain user-specified message. */
1136 handle_pragma_message (cpp_reader
*ARG_UNUSED(dummy
))
1138 enum cpp_ttype token
;
1139 tree x
, message
= 0;
1141 token
= pragma_lex (&x
);
1142 if (token
== CPP_OPEN_PAREN
)
1144 token
= pragma_lex (&x
);
1145 if (token
== CPP_STRING
)
1148 GCC_BAD ("expected a string after %<#pragma message%>");
1149 if (pragma_lex (&x
) != CPP_CLOSE_PAREN
)
1150 GCC_BAD ("malformed %<#pragma message%>, ignored");
1152 else if (token
== CPP_STRING
)
1155 GCC_BAD ("expected a string after %<#pragma message%>");
1157 gcc_assert (message
);
1159 if (pragma_lex (&x
) != CPP_EOF
)
1160 warning (OPT_Wpragmas
, "junk at end of %<#pragma message%>");
1162 if (TREE_STRING_LENGTH (message
) > 1)
1163 inform (input_location
, "#pragma message: %s", TREE_STRING_POINTER (message
));
1166 /* Mark whether the current location is valid for a STDC pragma. */
1168 static bool valid_location_for_stdc_pragma
;
1171 mark_valid_location_for_stdc_pragma (bool flag
)
1173 valid_location_for_stdc_pragma
= flag
;
1176 /* Return true if the current location is valid for a STDC pragma. */
1179 valid_location_for_stdc_pragma_p (void)
1181 return valid_location_for_stdc_pragma
;
1184 enum pragma_switch_t
{ PRAGMA_ON
, PRAGMA_OFF
, PRAGMA_DEFAULT
, PRAGMA_BAD
};
1186 /* A STDC pragma must appear outside of external declarations or
1187 preceding all explicit declarations and statements inside a compound
1188 statement; its behavior is undefined if used in any other context.
1189 It takes a switch of ON, OFF, or DEFAULT. */
1191 static enum pragma_switch_t
1192 handle_stdc_pragma (const char *pname
)
1196 enum pragma_switch_t ret
;
1198 if (!valid_location_for_stdc_pragma_p ())
1200 warning (OPT_Wpragmas
, "invalid location for %<pragma %s%>, ignored",
1205 if (pragma_lex (&t
) != CPP_NAME
)
1207 warning (OPT_Wpragmas
, "malformed %<#pragma %s%>, ignored", pname
);
1211 arg
= IDENTIFIER_POINTER (t
);
1213 if (!strcmp (arg
, "ON"))
1215 else if (!strcmp (arg
, "OFF"))
1217 else if (!strcmp (arg
, "DEFAULT"))
1218 ret
= PRAGMA_DEFAULT
;
1221 warning (OPT_Wpragmas
, "malformed %<#pragma %s%>, ignored", pname
);
1225 if (pragma_lex (&t
) != CPP_EOF
)
1227 warning (OPT_Wpragmas
, "junk at end of %<#pragma %s%>", pname
);
1234 /* #pragma STDC FLOAT_CONST_DECIMAL64 ON
1235 #pragma STDC FLOAT_CONST_DECIMAL64 OFF
1236 #pragma STDC FLOAT_CONST_DECIMAL64 DEFAULT */
1239 handle_pragma_float_const_decimal64 (cpp_reader
*ARG_UNUSED (dummy
))
1241 if (c_dialect_cxx ())
1243 if (warn_unknown_pragmas
> in_system_header
)
1244 warning (OPT_Wunknown_pragmas
,
1245 "%<#pragma STDC FLOAT_CONST_DECIMAL64%> is not supported"
1250 if (!targetm
.decimal_float_supported_p ())
1252 if (warn_unknown_pragmas
> in_system_header
)
1253 warning (OPT_Wunknown_pragmas
,
1254 "%<#pragma STDC FLOAT_CONST_DECIMAL64%> is not supported"
1259 pedwarn (input_location
, OPT_pedantic
,
1260 "ISO C does not support %<#pragma STDC FLOAT_CONST_DECIMAL64%>");
1262 switch (handle_stdc_pragma ("STDC FLOAT_CONST_DECIMAL64"))
1265 set_float_const_decimal64 ();
1268 case PRAGMA_DEFAULT
:
1269 clear_float_const_decimal64 ();
1276 /* A vector of registered pragma callbacks. */
1278 DEF_VEC_O (pragma_handler
);
1279 DEF_VEC_ALLOC_O (pragma_handler
, heap
);
1281 static VEC(pragma_handler
, heap
) *registered_pragmas
;
1289 DEF_VEC_O (pragma_ns_name
);
1290 DEF_VEC_ALLOC_O (pragma_ns_name
, heap
);
1292 static VEC(pragma_ns_name
, heap
) *registered_pp_pragmas
;
1294 struct omp_pragma_def
{ const char *name
; unsigned int id
; };
1295 static const struct omp_pragma_def omp_pragmas
[] = {
1296 { "atomic", PRAGMA_OMP_ATOMIC
},
1297 { "barrier", PRAGMA_OMP_BARRIER
},
1298 { "critical", PRAGMA_OMP_CRITICAL
},
1299 { "flush", PRAGMA_OMP_FLUSH
},
1300 { "for", PRAGMA_OMP_FOR
},
1301 { "master", PRAGMA_OMP_MASTER
},
1302 { "ordered", PRAGMA_OMP_ORDERED
},
1303 { "parallel", PRAGMA_OMP_PARALLEL
},
1304 { "section", PRAGMA_OMP_SECTION
},
1305 { "sections", PRAGMA_OMP_SECTIONS
},
1306 { "single", PRAGMA_OMP_SINGLE
},
1307 { "task", PRAGMA_OMP_TASK
},
1308 { "taskwait", PRAGMA_OMP_TASKWAIT
},
1309 { "threadprivate", PRAGMA_OMP_THREADPRIVATE
}
1313 c_pp_lookup_pragma (unsigned int id
, const char **space
, const char **name
)
1315 const int n_omp_pragmas
= sizeof (omp_pragmas
) / sizeof (*omp_pragmas
);
1318 for (i
= 0; i
< n_omp_pragmas
; ++i
)
1319 if (omp_pragmas
[i
].id
== id
)
1322 *name
= omp_pragmas
[i
].name
;
1326 if (id
>= PRAGMA_FIRST_EXTERNAL
1327 && (id
< PRAGMA_FIRST_EXTERNAL
1328 + VEC_length (pragma_ns_name
, registered_pp_pragmas
)))
1330 *space
= VEC_index (pragma_ns_name
, registered_pp_pragmas
,
1331 id
- PRAGMA_FIRST_EXTERNAL
)->space
;
1332 *name
= VEC_index (pragma_ns_name
, registered_pp_pragmas
,
1333 id
- PRAGMA_FIRST_EXTERNAL
)->name
;
1340 /* Front-end wrappers for pragma registration to avoid dragging
1341 cpplib.h in almost everywhere. */
1344 c_register_pragma_1 (const char *space
, const char *name
,
1345 pragma_handler handler
, bool allow_expansion
)
1349 if (flag_preprocess_only
)
1351 pragma_ns_name ns_name
;
1353 if (!allow_expansion
)
1356 ns_name
.space
= space
;
1357 ns_name
.name
= name
;
1358 VEC_safe_push (pragma_ns_name
, heap
, registered_pp_pragmas
, &ns_name
);
1359 id
= VEC_length (pragma_ns_name
, registered_pp_pragmas
);
1360 id
+= PRAGMA_FIRST_EXTERNAL
- 1;
1364 VEC_safe_push (pragma_handler
, heap
, registered_pragmas
, &handler
);
1365 id
= VEC_length (pragma_handler
, registered_pragmas
);
1366 id
+= PRAGMA_FIRST_EXTERNAL
- 1;
1368 /* The C++ front end allocates 6 bits in cp_token; the C front end
1369 allocates 7 bits in c_token. At present this is sufficient. */
1370 gcc_assert (id
< 64);
1373 cpp_register_deferred_pragma (parse_in
, space
, name
, id
,
1374 allow_expansion
, false);
1378 c_register_pragma (const char *space
, const char *name
, pragma_handler handler
)
1380 c_register_pragma_1 (space
, name
, handler
, false);
1384 c_register_pragma_with_expansion (const char *space
, const char *name
,
1385 pragma_handler handler
)
1387 c_register_pragma_1 (space
, name
, handler
, true);
1391 c_invoke_pragma_handler (unsigned int id
)
1393 pragma_handler handler
;
1395 id
-= PRAGMA_FIRST_EXTERNAL
;
1396 handler
= *VEC_index (pragma_handler
, registered_pragmas
, id
);
1401 /* Set up front-end pragmas. */
1407 const int n_omp_pragmas
= sizeof (omp_pragmas
) / sizeof (*omp_pragmas
);
1410 for (i
= 0; i
< n_omp_pragmas
; ++i
)
1411 cpp_register_deferred_pragma (parse_in
, "omp", omp_pragmas
[i
].name
,
1412 omp_pragmas
[i
].id
, true, true);
1415 if (!flag_preprocess_only
)
1416 cpp_register_deferred_pragma (parse_in
, "GCC", "pch_preprocess",
1417 PRAGMA_GCC_PCH_PREPROCESS
, false, false);
1419 #ifdef HANDLE_PRAGMA_PACK
1420 #ifdef HANDLE_PRAGMA_PACK_WITH_EXPANSION
1421 c_register_pragma_with_expansion (0, "pack", handle_pragma_pack
);
1423 c_register_pragma (0, "pack", handle_pragma_pack
);
1426 #ifdef HANDLE_PRAGMA_PUSH_POP_MACRO
1427 c_register_pragma (0 ,"push_macro", handle_pragma_push_macro
);
1428 c_register_pragma (0 ,"pop_macro", handle_pragma_pop_macro
);
1430 #ifdef HANDLE_PRAGMA_WEAK
1431 c_register_pragma (0, "weak", handle_pragma_weak
);
1433 #ifdef HANDLE_PRAGMA_VISIBILITY
1434 c_register_pragma ("GCC", "visibility", handle_pragma_visibility
);
1437 c_register_pragma ("GCC", "diagnostic", handle_pragma_diagnostic
);
1438 c_register_pragma ("GCC", "target", handle_pragma_target
);
1439 c_register_pragma ("GCC", "optimize", handle_pragma_optimize
);
1440 c_register_pragma ("GCC", "push_options", handle_pragma_push_options
);
1441 c_register_pragma ("GCC", "pop_options", handle_pragma_pop_options
);
1442 c_register_pragma ("GCC", "reset_options", handle_pragma_reset_options
);
1444 c_register_pragma ("STDC", "FLOAT_CONST_DECIMAL64",
1445 handle_pragma_float_const_decimal64
);
1447 c_register_pragma_with_expansion (0, "redefine_extname", handle_pragma_redefine_extname
);
1448 c_register_pragma (0, "extern_prefix", handle_pragma_extern_prefix
);
1450 c_register_pragma_with_expansion (0, "message", handle_pragma_message
);
1452 #ifdef REGISTER_TARGET_PRAGMAS
1453 REGISTER_TARGET_PRAGMAS ();
1457 #include "gt-c-pragma.h"