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"
42 #define GCC_BAD(gmsgid) \
43 do { warning (OPT_Wpragmas, gmsgid); return; } while (0)
44 #define GCC_BAD2(gmsgid, arg) \
45 do { warning (OPT_Wpragmas, gmsgid, arg); return; } while (0)
47 typedef struct GTY(()) align_stack
{
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, %E) encountered without matching #pragma pack(push, %E)"
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 %qE for %<#pragma pack%> - ignored", x
);
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 typedef struct GTY(()) pending_weak_d
253 DEF_VEC_O(pending_weak
);
254 DEF_VEC_ALLOC_O(pending_weak
,gc
);
256 static GTY(()) VEC(pending_weak
,gc
) *pending_weaks
;
258 #ifdef HANDLE_PRAGMA_WEAK
259 static void apply_pragma_weak (tree
, tree
);
260 static void handle_pragma_weak (cpp_reader
*);
263 apply_pragma_weak (tree decl
, tree value
)
267 value
= build_string (IDENTIFIER_LENGTH (value
),
268 IDENTIFIER_POINTER (value
));
269 decl_attributes (&decl
, build_tree_list (get_identifier ("alias"),
270 build_tree_list (NULL
, value
)),
274 if (SUPPORTS_WEAK
&& DECL_EXTERNAL (decl
) && TREE_USED (decl
)
275 && !DECL_WEAK (decl
) /* Don't complain about a redundant #pragma. */
276 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
277 warning (OPT_Wpragmas
, "applying #pragma weak %q+D after first use "
278 "results in unspecified behavior", decl
);
284 maybe_apply_pragma_weak (tree decl
)
290 /* Avoid asking for DECL_ASSEMBLER_NAME when it's not needed. */
292 /* No weak symbols pending, take the short-cut. */
295 /* If it's not visible outside this file, it doesn't matter whether
297 if (!DECL_EXTERNAL (decl
) && !TREE_PUBLIC (decl
))
299 /* If it's not a function or a variable, it can't be weak.
300 FIXME: what kinds of things are visible outside this file but
301 aren't functions or variables? Should this be an assert instead? */
302 if (TREE_CODE (decl
) != FUNCTION_DECL
&& TREE_CODE (decl
) != VAR_DECL
)
305 id
= DECL_ASSEMBLER_NAME (decl
);
307 for (i
= 0; VEC_iterate (pending_weak
, pending_weaks
, i
, pe
); i
++)
310 apply_pragma_weak (decl
, pe
->value
);
311 VEC_unordered_remove (pending_weak
, pending_weaks
, i
);
316 /* Process all "#pragma weak A = B" directives where we have not seen
319 maybe_apply_pending_pragma_weaks (void)
321 tree alias_id
, id
, decl
;
325 for (i
= 0; VEC_iterate (pending_weak
, pending_weaks
, i
, pe
); i
++)
333 decl
= build_decl (UNKNOWN_LOCATION
,
334 FUNCTION_DECL
, alias_id
, default_function_type
);
336 DECL_ARTIFICIAL (decl
) = 1;
337 TREE_PUBLIC (decl
) = 1;
338 DECL_EXTERNAL (decl
) = 1;
339 DECL_WEAK (decl
) = 1;
341 assemble_alias (decl
, id
);
345 /* #pragma weak name [= value] */
347 handle_pragma_weak (cpp_reader
* ARG_UNUSED (dummy
))
349 tree name
, value
, x
, decl
;
354 if (pragma_lex (&name
) != CPP_NAME
)
355 GCC_BAD ("malformed #pragma weak, ignored");
359 if (pragma_lex (&value
) != CPP_NAME
)
360 GCC_BAD ("malformed #pragma weak, ignored");
364 warning (OPT_Wpragmas
, "junk at end of %<#pragma weak%>");
366 decl
= identifier_global_value (name
);
367 if (decl
&& DECL_P (decl
))
369 apply_pragma_weak (decl
, value
);
371 assemble_alias (decl
, value
);
376 pe
= VEC_safe_push (pending_weak
, gc
, pending_weaks
, NULL
);
383 maybe_apply_pragma_weak (tree
ARG_UNUSED (decl
))
388 maybe_apply_pending_pragma_weaks (void)
391 #endif /* HANDLE_PRAGMA_WEAK */
393 /* GCC supports two #pragma directives for renaming the external
394 symbol associated with a declaration (DECL_ASSEMBLER_NAME), for
395 compatibility with the Solaris and Tru64 system headers. GCC also
396 has its own notation for this, __asm__("name") annotations.
398 Corner cases of these features and their interaction:
400 1) Both pragmas silently apply only to declarations with external
401 linkage (that is, TREE_PUBLIC || DECL_EXTERNAL). Asm labels
402 do not have this restriction.
404 2) In C++, both #pragmas silently apply only to extern "C" declarations.
405 Asm labels do not have this restriction.
407 3) If any of the three ways of changing DECL_ASSEMBLER_NAME is
408 applied to a decl whose DECL_ASSEMBLER_NAME is already set, and the
409 new name is different, a warning issues and the name does not change.
411 4) The "source name" for #pragma redefine_extname is the DECL_NAME,
412 *not* the DECL_ASSEMBLER_NAME.
414 5) If #pragma extern_prefix is in effect and a declaration occurs
415 with an __asm__ name, the #pragma extern_prefix is silently
416 ignored for that declaration.
418 6) If #pragma extern_prefix and #pragma redefine_extname apply to
419 the same declaration, whichever triggered first wins, and a warning
420 is issued. (We would like to have #pragma redefine_extname always
421 win, but it can appear either before or after the declaration, and
422 if it appears afterward, we have no way of knowing whether a modified
423 DECL_ASSEMBLER_NAME is due to #pragma extern_prefix.) */
425 static GTY(()) tree pending_redefine_extname
;
427 static void handle_pragma_redefine_extname (cpp_reader
*);
429 /* #pragma redefine_extname oldname newname */
431 handle_pragma_redefine_extname (cpp_reader
* ARG_UNUSED (dummy
))
433 tree oldname
, newname
, decl
, x
;
436 if (pragma_lex (&oldname
) != CPP_NAME
)
437 GCC_BAD ("malformed #pragma redefine_extname, ignored");
438 if (pragma_lex (&newname
) != CPP_NAME
)
439 GCC_BAD ("malformed #pragma redefine_extname, ignored");
442 warning (OPT_Wpragmas
, "junk at end of %<#pragma redefine_extname%>");
444 decl
= identifier_global_value (oldname
);
446 && (TREE_PUBLIC (decl
) || DECL_EXTERNAL (decl
))
447 && (TREE_CODE (decl
) == FUNCTION_DECL
448 || TREE_CODE (decl
) == VAR_DECL
)
449 && has_c_linkage (decl
))
451 if (DECL_ASSEMBLER_NAME_SET_P (decl
))
453 const char *name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
454 name
= targetm
.strip_name_encoding (name
);
456 if (strcmp (name
, IDENTIFIER_POINTER (newname
)))
457 warning (OPT_Wpragmas
, "#pragma redefine_extname ignored due to "
458 "conflict with previous rename");
461 change_decl_assembler_name (decl
, newname
);
464 /* We have to add this to the rename list even if there's already
465 a global value that doesn't meet the above criteria, because in
466 C++ "struct foo {...};" puts "foo" in the current namespace but
467 does *not* conflict with a subsequent declaration of a function
468 or variable foo. See g++.dg/other/pragma-re-2.C. */
469 add_to_renaming_pragma_list (oldname
, newname
);
472 /* This is called from here and from ia64.c. */
474 add_to_renaming_pragma_list (tree oldname
, tree newname
)
476 tree previous
= purpose_member (oldname
, pending_redefine_extname
);
479 if (TREE_VALUE (previous
) != newname
)
480 warning (OPT_Wpragmas
, "#pragma redefine_extname ignored due to "
481 "conflict with previous #pragma redefine_extname");
485 pending_redefine_extname
486 = tree_cons (oldname
, newname
, pending_redefine_extname
);
489 static GTY(()) tree pragma_extern_prefix
;
491 /* #pragma extern_prefix "prefix" */
493 handle_pragma_extern_prefix (cpp_reader
* ARG_UNUSED (dummy
))
498 if (pragma_lex (&prefix
) != CPP_STRING
)
499 GCC_BAD ("malformed #pragma extern_prefix, ignored");
502 warning (OPT_Wpragmas
, "junk at end of %<#pragma extern_prefix%>");
504 if (targetm
.handle_pragma_extern_prefix
)
505 /* Note that the length includes the null terminator. */
506 pragma_extern_prefix
= (TREE_STRING_LENGTH (prefix
) > 1 ? prefix
: NULL
);
507 else if (warn_unknown_pragmas
> in_system_header
)
508 warning (OPT_Wunknown_pragmas
,
509 "#pragma extern_prefix not supported on this target");
512 /* Hook from the front ends to apply the results of one of the preceding
513 pragmas that rename variables. */
516 maybe_apply_renaming_pragma (tree decl
, tree asmname
)
520 /* The renaming pragmas are only applied to declarations with
522 if ((TREE_CODE (decl
) != FUNCTION_DECL
&& TREE_CODE (decl
) != VAR_DECL
)
523 || (!TREE_PUBLIC (decl
) && !DECL_EXTERNAL (decl
))
524 || !has_c_linkage (decl
))
527 /* If the DECL_ASSEMBLER_NAME is already set, it does not change,
528 but we may warn about a rename that conflicts. */
529 if (DECL_ASSEMBLER_NAME_SET_P (decl
))
531 const char *oldname
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
532 oldname
= targetm
.strip_name_encoding (oldname
);
534 if (asmname
&& strcmp (TREE_STRING_POINTER (asmname
), oldname
))
535 warning (OPT_Wpragmas
, "asm declaration ignored due to "
536 "conflict with previous rename");
538 /* Take any pending redefine_extname off the list. */
539 for (p
= &pending_redefine_extname
; (t
= *p
); p
= &TREE_CHAIN (t
))
540 if (DECL_NAME (decl
) == TREE_PURPOSE (t
))
542 /* Only warn if there is a conflict. */
543 if (strcmp (IDENTIFIER_POINTER (TREE_VALUE (t
)), oldname
))
544 warning (OPT_Wpragmas
, "#pragma redefine_extname ignored due to "
545 "conflict with previous rename");
553 /* Find out if we have a pending #pragma redefine_extname. */
554 for (p
= &pending_redefine_extname
; (t
= *p
); p
= &TREE_CHAIN (t
))
555 if (DECL_NAME (decl
) == TREE_PURPOSE (t
))
557 tree newname
= TREE_VALUE (t
);
560 /* If we already have an asmname, #pragma redefine_extname is
561 ignored (with a warning if it conflicts). */
564 if (strcmp (TREE_STRING_POINTER (asmname
),
565 IDENTIFIER_POINTER (newname
)) != 0)
566 warning (OPT_Wpragmas
, "#pragma redefine_extname ignored due to "
567 "conflict with __asm__ declaration");
571 /* Otherwise we use what we've got; #pragma extern_prefix is
573 return build_string (IDENTIFIER_LENGTH (newname
),
574 IDENTIFIER_POINTER (newname
));
577 /* If we've got an asmname, #pragma extern_prefix is silently ignored. */
581 /* If #pragma extern_prefix is in effect, apply it. */
582 if (pragma_extern_prefix
)
584 const char *prefix
= TREE_STRING_POINTER (pragma_extern_prefix
);
585 size_t plen
= TREE_STRING_LENGTH (pragma_extern_prefix
) - 1;
587 const char *id
= IDENTIFIER_POINTER (DECL_NAME (decl
));
588 size_t ilen
= IDENTIFIER_LENGTH (DECL_NAME (decl
));
590 char *newname
= (char *) alloca (plen
+ ilen
+ 1);
592 memcpy (newname
, prefix
, plen
);
593 memcpy (newname
+ plen
, id
, ilen
+ 1);
595 return build_string (plen
+ ilen
, newname
);
603 #ifdef HANDLE_PRAGMA_VISIBILITY
604 static void handle_pragma_visibility (cpp_reader
*);
606 static VEC (int, heap
) *visstack
;
608 /* Push the visibility indicated by STR onto the top of the #pragma
609 visibility stack. KIND is 0 for #pragma GCC visibility, 1 for
610 C++ namespace with visibility attribute and 2 for C++ builtin
611 ABI namespace. push_visibility/pop_visibility calls must have
612 matching KIND, it is not allowed to push visibility using one
613 KIND and pop using a different one. */
616 push_visibility (const char *str
, int kind
)
618 VEC_safe_push (int, heap
, visstack
,
619 ((int) default_visibility
) | (kind
<< 8));
620 if (!strcmp (str
, "default"))
621 default_visibility
= VISIBILITY_DEFAULT
;
622 else if (!strcmp (str
, "internal"))
623 default_visibility
= VISIBILITY_INTERNAL
;
624 else if (!strcmp (str
, "hidden"))
625 default_visibility
= VISIBILITY_HIDDEN
;
626 else if (!strcmp (str
, "protected"))
627 default_visibility
= VISIBILITY_PROTECTED
;
629 GCC_BAD ("#pragma GCC visibility push() must specify default, internal, hidden or protected");
630 visibility_options
.inpragma
= 1;
633 /* Pop a level of the #pragma visibility stack. Return true if
637 pop_visibility (int kind
)
639 if (!VEC_length (int, visstack
))
641 if ((VEC_last (int, visstack
) >> 8) != kind
)
644 = (enum symbol_visibility
) (VEC_pop (int, visstack
) & 0xff);
645 visibility_options
.inpragma
646 = VEC_length (int, visstack
) != 0;
650 /* Sets the default visibility for symbols to something other than that
651 specified on the command line. */
654 handle_pragma_visibility (cpp_reader
*dummy ATTRIBUTE_UNUSED
)
656 /* Form is #pragma GCC visibility push(hidden)|pop */
658 enum cpp_ttype token
;
659 enum { bad
, push
, pop
} action
= bad
;
661 token
= pragma_lex (&x
);
662 if (token
== CPP_NAME
)
664 const char *op
= IDENTIFIER_POINTER (x
);
665 if (!strcmp (op
, "push"))
667 else if (!strcmp (op
, "pop"))
671 GCC_BAD ("#pragma GCC visibility must be followed by push or pop");
676 if (! pop_visibility (0))
677 GCC_BAD ("no matching push for %<#pragma GCC visibility pop%>");
681 if (pragma_lex (&x
) != CPP_OPEN_PAREN
)
682 GCC_BAD ("missing %<(%> after %<#pragma GCC visibility push%> - ignored");
683 token
= pragma_lex (&x
);
684 if (token
!= CPP_NAME
)
685 GCC_BAD ("malformed #pragma GCC visibility push");
687 push_visibility (IDENTIFIER_POINTER (x
), 0);
688 if (pragma_lex (&x
) != CPP_CLOSE_PAREN
)
689 GCC_BAD ("missing %<(%> after %<#pragma GCC visibility push%> - ignored");
692 if (pragma_lex (&x
) != CPP_EOF
)
693 warning (OPT_Wpragmas
, "junk at end of %<#pragma GCC visibility%>");
699 handle_pragma_diagnostic(cpp_reader
*ARG_UNUSED(dummy
))
701 const char *kind_string
, *option_string
;
702 unsigned int option_index
;
703 enum cpp_ttype token
;
709 error ("#pragma GCC diagnostic not allowed inside functions");
713 token
= pragma_lex (&x
);
714 if (token
!= CPP_NAME
)
715 GCC_BAD ("missing [error|warning|ignored] after %<#pragma GCC diagnostic%>");
716 kind_string
= IDENTIFIER_POINTER (x
);
717 if (strcmp (kind_string
, "error") == 0)
719 else if (strcmp (kind_string
, "warning") == 0)
721 else if (strcmp (kind_string
, "ignored") == 0)
724 GCC_BAD ("expected [error|warning|ignored] after %<#pragma GCC diagnostic%>");
726 token
= pragma_lex (&x
);
727 if (token
!= CPP_STRING
)
728 GCC_BAD ("missing option after %<#pragma GCC diagnostic%> kind");
729 option_string
= TREE_STRING_POINTER (x
);
730 for (option_index
= 0; option_index
< cl_options_count
; option_index
++)
731 if (strcmp (cl_options
[option_index
].opt_text
, option_string
) == 0)
733 /* This overrides -Werror, for example. */
734 diagnostic_classify_diagnostic (global_dc
, option_index
, kind
);
735 /* This makes sure the option is enabled, like -Wfoo would do. */
736 if (cl_options
[option_index
].var_type
== CLVC_BOOLEAN
737 && cl_options
[option_index
].flag_var
738 && kind
!= DK_IGNORED
)
739 *(int *) cl_options
[option_index
].flag_var
= 1;
742 GCC_BAD ("unknown option after %<#pragma GCC diagnostic%> kind");
745 /* Parse #pragma GCC target (xxx) to set target specific options. */
747 handle_pragma_target(cpp_reader
*ARG_UNUSED(dummy
))
749 enum cpp_ttype token
;
751 bool close_paren_needed_p
= false;
755 error ("#pragma GCC option is not allowed inside functions");
759 token
= pragma_lex (&x
);
760 if (token
== CPP_OPEN_PAREN
)
762 close_paren_needed_p
= true;
763 token
= pragma_lex (&x
);
766 if (token
!= CPP_STRING
)
768 GCC_BAD ("%<#pragma GCC option%> is not a string");
772 /* Strings are user options. */
775 tree args
= NULL_TREE
;
779 /* Build up the strings now as a tree linked list. Skip empty
781 if (TREE_STRING_LENGTH (x
) > 0)
782 args
= tree_cons (NULL_TREE
, x
, args
);
784 token
= pragma_lex (&x
);
785 while (token
== CPP_COMMA
)
786 token
= pragma_lex (&x
);
788 while (token
== CPP_STRING
);
790 if (close_paren_needed_p
)
792 if (token
== CPP_CLOSE_PAREN
)
793 token
= pragma_lex (&x
);
795 GCC_BAD ("%<#pragma GCC target (string [,string]...)%> does "
796 "not have a final %<)%>.");
799 if (token
!= CPP_EOF
)
801 error ("#pragma GCC target string... is badly formed");
805 /* put arguments in the order the user typed them. */
806 args
= nreverse (args
);
808 if (targetm
.target_option
.pragma_parse (args
, NULL_TREE
))
809 current_target_pragma
= args
;
813 /* Handle #pragma GCC optimize to set optimization options. */
815 handle_pragma_optimize (cpp_reader
*ARG_UNUSED(dummy
))
817 enum cpp_ttype token
;
819 bool close_paren_needed_p
= false;
820 tree optimization_previous_node
= optimization_current_node
;
824 error ("#pragma GCC optimize is not allowed inside functions");
828 token
= pragma_lex (&x
);
829 if (token
== CPP_OPEN_PAREN
)
831 close_paren_needed_p
= true;
832 token
= pragma_lex (&x
);
835 if (token
!= CPP_STRING
&& token
!= CPP_NUMBER
)
837 GCC_BAD ("%<#pragma GCC optimize%> is not a string or number");
841 /* Strings/numbers are user options. */
844 tree args
= NULL_TREE
;
848 /* Build up the numbers/strings now as a list. */
849 if (token
!= CPP_STRING
|| TREE_STRING_LENGTH (x
) > 0)
850 args
= tree_cons (NULL_TREE
, x
, args
);
852 token
= pragma_lex (&x
);
853 while (token
== CPP_COMMA
)
854 token
= pragma_lex (&x
);
856 while (token
== CPP_STRING
|| token
== CPP_NUMBER
);
858 if (close_paren_needed_p
)
860 if (token
== CPP_CLOSE_PAREN
)
861 token
= pragma_lex (&x
);
863 GCC_BAD ("%<#pragma GCC optimize (string [,string]...)%> does "
864 "not have a final %<)%>.");
867 if (token
!= CPP_EOF
)
869 error ("#pragma GCC optimize string... is badly formed");
873 /* put arguments in the order the user typed them. */
874 args
= nreverse (args
);
876 parse_optimize_options (args
, false);
877 current_optimize_pragma
= chainon (current_optimize_pragma
, args
);
878 optimization_current_node
= build_optimization_node ();
879 c_cpp_builtins_optimize_pragma (parse_in
,
880 optimization_previous_node
,
881 optimization_current_node
);
885 /* Stack of the #pragma GCC options created with #pragma GCC push_option. Save
886 both the binary representation of the options and the TREE_LIST of
887 strings that will be added to the function's attribute list. */
888 typedef struct GTY(()) opt_stack
{
889 struct opt_stack
*prev
;
892 tree optimize_binary
;
893 tree optimize_strings
;
896 static GTY(()) struct opt_stack
* options_stack
;
898 /* Handle #pragma GCC push_options to save the current target and optimization
902 handle_pragma_push_options (cpp_reader
*ARG_UNUSED(dummy
))
904 enum cpp_ttype token
;
908 token
= pragma_lex (&x
);
909 if (token
!= CPP_EOF
)
911 warning (OPT_Wpragmas
, "junk at end of %<#pragma push_options%>");
915 p
= GGC_NEW (opt_stack
);
916 p
->prev
= options_stack
;
919 /* Save optimization and target flags in binary format. */
920 p
->optimize_binary
= build_optimization_node ();
921 p
->target_binary
= build_target_option_node ();
923 /* Save optimization and target flags in string list format. */
924 p
->optimize_strings
= copy_list (current_optimize_pragma
);
925 p
->target_strings
= copy_list (current_target_pragma
);
928 /* Handle #pragma GCC pop_options to restore the current target and
929 optimization options from a previous push_options. */
932 handle_pragma_pop_options (cpp_reader
*ARG_UNUSED(dummy
))
934 enum cpp_ttype token
;
938 token
= pragma_lex (&x
);
939 if (token
!= CPP_EOF
)
941 warning (OPT_Wpragmas
, "junk at end of %<#pragma pop_options%>");
947 warning (OPT_Wpragmas
,
948 "%<#pragma GCC pop_options%> without a corresponding "
949 "%<#pragma GCC push_options%>");
954 options_stack
= p
->prev
;
956 if (p
->target_binary
!= target_option_current_node
)
958 (void) targetm
.target_option
.pragma_parse (NULL_TREE
, p
->target_binary
);
959 target_option_current_node
= p
->target_binary
;
962 if (p
->optimize_binary
!= optimization_current_node
)
964 tree old_optimize
= optimization_current_node
;
965 cl_optimization_restore (TREE_OPTIMIZATION (p
->optimize_binary
));
966 c_cpp_builtins_optimize_pragma (parse_in
, old_optimize
,
968 optimization_current_node
= p
->optimize_binary
;
971 current_target_pragma
= p
->target_strings
;
972 current_optimize_pragma
= p
->optimize_strings
;
975 /* Handle #pragma GCC reset_options to restore the current target and
976 optimization options to the original options used on the command line. */
979 handle_pragma_reset_options (cpp_reader
*ARG_UNUSED(dummy
))
981 enum cpp_ttype token
;
983 tree new_optimize
= optimization_default_node
;
984 tree new_target
= target_option_default_node
;
986 token
= pragma_lex (&x
);
987 if (token
!= CPP_EOF
)
989 warning (OPT_Wpragmas
, "junk at end of %<#pragma reset_options%>");
993 if (new_target
!= target_option_current_node
)
995 (void) targetm
.target_option
.pragma_parse (NULL_TREE
, new_target
);
996 target_option_current_node
= new_target
;
999 if (new_optimize
!= optimization_current_node
)
1001 tree old_optimize
= optimization_current_node
;
1002 cl_optimization_restore (TREE_OPTIMIZATION (new_optimize
));
1003 c_cpp_builtins_optimize_pragma (parse_in
, old_optimize
, new_optimize
);
1004 optimization_current_node
= new_optimize
;
1007 current_target_pragma
= NULL_TREE
;
1008 current_optimize_pragma
= NULL_TREE
;
1011 /* Print a plain user-specified message. */
1014 handle_pragma_message (cpp_reader
*ARG_UNUSED(dummy
))
1016 enum cpp_ttype token
;
1017 tree x
, message
= 0;
1019 token
= pragma_lex (&x
);
1020 if (token
== CPP_OPEN_PAREN
)
1022 token
= pragma_lex (&x
);
1023 if (token
== CPP_STRING
)
1026 GCC_BAD ("expected a string after %<#pragma message%>");
1027 if (pragma_lex (&x
) != CPP_CLOSE_PAREN
)
1028 GCC_BAD ("malformed %<#pragma message%>, ignored");
1030 else if (token
== CPP_STRING
)
1033 GCC_BAD ("expected a string after %<#pragma message%>");
1035 gcc_assert (message
);
1037 if (pragma_lex (&x
) != CPP_EOF
)
1038 warning (OPT_Wpragmas
, "junk at end of %<#pragma message%>");
1040 if (TREE_STRING_LENGTH (message
) > 1)
1041 inform (input_location
, "#pragma message: %s", TREE_STRING_POINTER (message
));
1044 /* Mark whether the current location is valid for a STDC pragma. */
1046 static bool valid_location_for_stdc_pragma
;
1049 mark_valid_location_for_stdc_pragma (bool flag
)
1051 valid_location_for_stdc_pragma
= flag
;
1054 /* Return true if the current location is valid for a STDC pragma. */
1057 valid_location_for_stdc_pragma_p (void)
1059 return valid_location_for_stdc_pragma
;
1062 enum pragma_switch_t
{ PRAGMA_ON
, PRAGMA_OFF
, PRAGMA_DEFAULT
, PRAGMA_BAD
};
1064 /* A STDC pragma must appear outside of external declarations or
1065 preceding all explicit declarations and statements inside a compound
1066 statement; its behavior is undefined if used in any other context.
1067 It takes a switch of ON, OFF, or DEFAULT. */
1069 static enum pragma_switch_t
1070 handle_stdc_pragma (const char *pname
)
1074 enum pragma_switch_t ret
;
1076 if (!valid_location_for_stdc_pragma_p ())
1078 warning (OPT_Wpragmas
, "invalid location for %<pragma %s%>, ignored",
1083 if (pragma_lex (&t
) != CPP_NAME
)
1085 warning (OPT_Wpragmas
, "malformed %<#pragma %s%>, ignored", pname
);
1089 arg
= IDENTIFIER_POINTER (t
);
1091 if (!strcmp (arg
, "ON"))
1093 else if (!strcmp (arg
, "OFF"))
1095 else if (!strcmp (arg
, "DEFAULT"))
1096 ret
= PRAGMA_DEFAULT
;
1099 warning (OPT_Wpragmas
, "malformed %<#pragma %s%>, ignored", pname
);
1103 if (pragma_lex (&t
) != CPP_EOF
)
1105 warning (OPT_Wpragmas
, "junk at end of %<#pragma %s%>", pname
);
1112 /* #pragma STDC FLOAT_CONST_DECIMAL64 ON
1113 #pragma STDC FLOAT_CONST_DECIMAL64 OFF
1114 #pragma STDC FLOAT_CONST_DECIMAL64 DEFAULT */
1117 handle_pragma_float_const_decimal64 (cpp_reader
*ARG_UNUSED (dummy
))
1119 if (c_dialect_cxx ())
1121 if (warn_unknown_pragmas
> in_system_header
)
1122 warning (OPT_Wunknown_pragmas
,
1123 "%<#pragma STDC FLOAT_CONST_DECIMAL64%> is not supported"
1128 if (!targetm
.decimal_float_supported_p ())
1130 if (warn_unknown_pragmas
> in_system_header
)
1131 warning (OPT_Wunknown_pragmas
,
1132 "%<#pragma STDC FLOAT_CONST_DECIMAL64%> is not supported"
1137 pedwarn (input_location
, OPT_pedantic
,
1138 "ISO C does not support %<#pragma STDC FLOAT_CONST_DECIMAL64%>");
1140 switch (handle_stdc_pragma ("STDC FLOAT_CONST_DECIMAL64"))
1143 set_float_const_decimal64 ();
1146 case PRAGMA_DEFAULT
:
1147 clear_float_const_decimal64 ();
1154 /* A vector of registered pragma callbacks. */
1156 DEF_VEC_O (pragma_handler
);
1157 DEF_VEC_ALLOC_O (pragma_handler
, heap
);
1159 static VEC(pragma_handler
, heap
) *registered_pragmas
;
1167 DEF_VEC_O (pragma_ns_name
);
1168 DEF_VEC_ALLOC_O (pragma_ns_name
, heap
);
1170 static VEC(pragma_ns_name
, heap
) *registered_pp_pragmas
;
1172 struct omp_pragma_def
{ const char *name
; unsigned int id
; };
1173 static const struct omp_pragma_def omp_pragmas
[] = {
1174 { "atomic", PRAGMA_OMP_ATOMIC
},
1175 { "barrier", PRAGMA_OMP_BARRIER
},
1176 { "critical", PRAGMA_OMP_CRITICAL
},
1177 { "flush", PRAGMA_OMP_FLUSH
},
1178 { "for", PRAGMA_OMP_FOR
},
1179 { "master", PRAGMA_OMP_MASTER
},
1180 { "ordered", PRAGMA_OMP_ORDERED
},
1181 { "parallel", PRAGMA_OMP_PARALLEL
},
1182 { "section", PRAGMA_OMP_SECTION
},
1183 { "sections", PRAGMA_OMP_SECTIONS
},
1184 { "single", PRAGMA_OMP_SINGLE
},
1185 { "task", PRAGMA_OMP_TASK
},
1186 { "taskwait", PRAGMA_OMP_TASKWAIT
},
1187 { "threadprivate", PRAGMA_OMP_THREADPRIVATE
}
1191 c_pp_lookup_pragma (unsigned int id
, const char **space
, const char **name
)
1193 const int n_omp_pragmas
= sizeof (omp_pragmas
) / sizeof (*omp_pragmas
);
1196 for (i
= 0; i
< n_omp_pragmas
; ++i
)
1197 if (omp_pragmas
[i
].id
== id
)
1200 *name
= omp_pragmas
[i
].name
;
1204 if (id
>= PRAGMA_FIRST_EXTERNAL
1205 && (id
< PRAGMA_FIRST_EXTERNAL
1206 + VEC_length (pragma_ns_name
, registered_pp_pragmas
)))
1208 *space
= VEC_index (pragma_ns_name
, registered_pp_pragmas
,
1209 id
- PRAGMA_FIRST_EXTERNAL
)->space
;
1210 *name
= VEC_index (pragma_ns_name
, registered_pp_pragmas
,
1211 id
- PRAGMA_FIRST_EXTERNAL
)->name
;
1218 /* Front-end wrappers for pragma registration to avoid dragging
1219 cpplib.h in almost everywhere. */
1222 c_register_pragma_1 (const char *space
, const char *name
,
1223 pragma_handler handler
, bool allow_expansion
)
1227 if (flag_preprocess_only
)
1229 pragma_ns_name ns_name
;
1231 if (!allow_expansion
)
1234 ns_name
.space
= space
;
1235 ns_name
.name
= name
;
1236 VEC_safe_push (pragma_ns_name
, heap
, registered_pp_pragmas
, &ns_name
);
1237 id
= VEC_length (pragma_ns_name
, registered_pp_pragmas
);
1238 id
+= PRAGMA_FIRST_EXTERNAL
- 1;
1242 VEC_safe_push (pragma_handler
, heap
, registered_pragmas
, &handler
);
1243 id
= VEC_length (pragma_handler
, registered_pragmas
);
1244 id
+= PRAGMA_FIRST_EXTERNAL
- 1;
1246 /* The C++ front end allocates 6 bits in cp_token; the C front end
1247 allocates 7 bits in c_token. At present this is sufficient. */
1248 gcc_assert (id
< 64);
1251 cpp_register_deferred_pragma (parse_in
, space
, name
, id
,
1252 allow_expansion
, false);
1256 c_register_pragma (const char *space
, const char *name
, pragma_handler handler
)
1258 c_register_pragma_1 (space
, name
, handler
, false);
1262 c_register_pragma_with_expansion (const char *space
, const char *name
,
1263 pragma_handler handler
)
1265 c_register_pragma_1 (space
, name
, handler
, true);
1269 c_invoke_pragma_handler (unsigned int id
)
1271 pragma_handler handler
;
1273 id
-= PRAGMA_FIRST_EXTERNAL
;
1274 handler
= *VEC_index (pragma_handler
, registered_pragmas
, id
);
1279 /* Set up front-end pragmas. */
1285 const int n_omp_pragmas
= sizeof (omp_pragmas
) / sizeof (*omp_pragmas
);
1288 for (i
= 0; i
< n_omp_pragmas
; ++i
)
1289 cpp_register_deferred_pragma (parse_in
, "omp", omp_pragmas
[i
].name
,
1290 omp_pragmas
[i
].id
, true, true);
1293 if (!flag_preprocess_only
)
1294 cpp_register_deferred_pragma (parse_in
, "GCC", "pch_preprocess",
1295 PRAGMA_GCC_PCH_PREPROCESS
, false, false);
1297 #ifdef HANDLE_PRAGMA_PACK
1298 #ifdef HANDLE_PRAGMA_PACK_WITH_EXPANSION
1299 c_register_pragma_with_expansion (0, "pack", handle_pragma_pack
);
1301 c_register_pragma (0, "pack", handle_pragma_pack
);
1304 #ifdef HANDLE_PRAGMA_WEAK
1305 c_register_pragma (0, "weak", handle_pragma_weak
);
1307 #ifdef HANDLE_PRAGMA_VISIBILITY
1308 c_register_pragma ("GCC", "visibility", handle_pragma_visibility
);
1311 c_register_pragma ("GCC", "diagnostic", handle_pragma_diagnostic
);
1312 c_register_pragma ("GCC", "target", handle_pragma_target
);
1313 c_register_pragma ("GCC", "optimize", handle_pragma_optimize
);
1314 c_register_pragma ("GCC", "push_options", handle_pragma_push_options
);
1315 c_register_pragma ("GCC", "pop_options", handle_pragma_pop_options
);
1316 c_register_pragma ("GCC", "reset_options", handle_pragma_reset_options
);
1318 c_register_pragma ("STDC", "FLOAT_CONST_DECIMAL64",
1319 handle_pragma_float_const_decimal64
);
1321 c_register_pragma_with_expansion (0, "redefine_extname", handle_pragma_redefine_extname
);
1322 c_register_pragma (0, "extern_prefix", handle_pragma_extern_prefix
);
1324 c_register_pragma_with_expansion (0, "message", handle_pragma_message
);
1326 #ifdef REGISTER_TARGET_PRAGMAS
1327 REGISTER_TARGET_PRAGMAS ();
1330 /* Allow plugins to register their own pragmas. */
1331 invoke_plugin_callbacks (PLUGIN_PRAGMAS
, NULL
);
1334 #include "gt-c-pragma.h"