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, 2009, 2010 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"
26 #include "function.h" /* For cfun. FIXME: Does the parser know
27 when it is inside a function, so that
28 we don't have to look at cfun? */
34 #include "tm_p.h" /* For REGISTER_TARGET_PRAGMAS (why is
35 this not a target hook?). */
39 #include "diagnostic.h"
43 #define GCC_BAD(gmsgid) \
44 do { warning (OPT_Wpragmas, gmsgid); return; } while (0)
45 #define GCC_BAD2(gmsgid, arg) \
46 do { warning (OPT_Wpragmas, gmsgid, arg); return; } while (0)
48 typedef struct GTY(()) align_stack
{
51 struct align_stack
* prev
;
54 static GTY(()) struct align_stack
* alignment_stack
;
56 static void handle_pragma_pack (cpp_reader
*);
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_alloc_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
;
130 #pragma pack (push, N)
131 #pragma pack (push, ID)
132 #pragma pack (push, ID, N)
134 #pragma pack (pop, ID) */
136 handle_pragma_pack (cpp_reader
* ARG_UNUSED (dummy
))
140 enum cpp_ttype token
;
141 enum { set
, push
, pop
} action
;
143 if (pragma_lex (&x
) != CPP_OPEN_PAREN
)
144 GCC_BAD ("missing %<(%> after %<#pragma pack%> - ignored");
146 token
= pragma_lex (&x
);
147 if (token
== CPP_CLOSE_PAREN
)
150 align
= initial_max_fld_align
;
152 else if (token
== CPP_NUMBER
)
154 if (TREE_CODE (x
) != INTEGER_CST
)
155 GCC_BAD ("invalid constant in %<#pragma pack%> - ignored");
156 align
= TREE_INT_CST_LOW (x
);
158 if (pragma_lex (&x
) != CPP_CLOSE_PAREN
)
159 GCC_BAD ("malformed %<#pragma pack%> - ignored");
161 else if (token
== CPP_NAME
)
163 #define GCC_BAD_ACTION do { if (action != pop) \
164 GCC_BAD ("malformed %<#pragma pack(push[, id][, <n>])%> - ignored"); \
166 GCC_BAD ("malformed %<#pragma pack(pop[, id])%> - ignored"); \
169 const char *op
= IDENTIFIER_POINTER (x
);
170 if (!strcmp (op
, "push"))
172 else if (!strcmp (op
, "pop"))
175 GCC_BAD2 ("unknown action %qE for %<#pragma pack%> - ignored", x
);
177 while ((token
= pragma_lex (&x
)) == CPP_COMMA
)
179 token
= pragma_lex (&x
);
180 if (token
== CPP_NAME
&& id
== 0)
184 else if (token
== CPP_NUMBER
&& action
== push
&& align
== -1)
186 if (TREE_CODE (x
) != INTEGER_CST
)
187 GCC_BAD ("invalid constant in %<#pragma pack%> - ignored");
188 align
= TREE_INT_CST_LOW (x
);
196 if (token
!= CPP_CLOSE_PAREN
)
198 #undef GCC_BAD_ACTION
201 GCC_BAD ("malformed %<#pragma pack%> - ignored");
203 if (pragma_lex (&x
) != CPP_EOF
)
204 warning (OPT_Wpragmas
, "junk at end of %<#pragma pack%>");
206 if (flag_pack_struct
)
207 GCC_BAD ("#pragma pack has no effect with -fpack-struct - ignored");
218 align
*= BITS_PER_UNIT
;
223 align
= maximum_field_alignment
;
227 GCC_BAD2 ("alignment must be a small power of two, not %d", align
);
232 case set
: SET_GLOBAL_ALIGNMENT (align
); break;
233 case push
: push_alignment (align
, id
); break;
234 case pop
: pop_alignment (id
); break;
238 typedef struct GTY(()) pending_weak_d
244 DEF_VEC_O(pending_weak
);
245 DEF_VEC_ALLOC_O(pending_weak
,gc
);
247 static GTY(()) VEC(pending_weak
,gc
) *pending_weaks
;
249 static void apply_pragma_weak (tree
, tree
);
250 static void handle_pragma_weak (cpp_reader
*);
253 apply_pragma_weak (tree decl
, tree value
)
257 value
= build_string (IDENTIFIER_LENGTH (value
),
258 IDENTIFIER_POINTER (value
));
259 decl_attributes (&decl
, build_tree_list (get_identifier ("alias"),
260 build_tree_list (NULL
, value
)),
264 if (SUPPORTS_WEAK
&& DECL_EXTERNAL (decl
) && TREE_USED (decl
)
265 && !DECL_WEAK (decl
) /* Don't complain about a redundant #pragma. */
266 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
267 warning (OPT_Wpragmas
, "applying #pragma weak %q+D after first use "
268 "results in unspecified behavior", decl
);
274 maybe_apply_pragma_weak (tree decl
)
280 /* Avoid asking for DECL_ASSEMBLER_NAME when it's not needed. */
282 /* No weak symbols pending, take the short-cut. */
285 /* If it's not visible outside this file, it doesn't matter whether
287 if (!DECL_EXTERNAL (decl
) && !TREE_PUBLIC (decl
))
289 /* If it's not a function or a variable, it can't be weak.
290 FIXME: what kinds of things are visible outside this file but
291 aren't functions or variables? Should this be an assert instead? */
292 if (TREE_CODE (decl
) != FUNCTION_DECL
&& TREE_CODE (decl
) != VAR_DECL
)
295 id
= DECL_ASSEMBLER_NAME (decl
);
297 FOR_EACH_VEC_ELT (pending_weak
, pending_weaks
, i
, pe
)
300 apply_pragma_weak (decl
, pe
->value
);
301 VEC_unordered_remove (pending_weak
, pending_weaks
, i
);
306 /* Process all "#pragma weak A = B" directives where we have not seen
309 maybe_apply_pending_pragma_weaks (void)
311 tree alias_id
, id
, decl
;
315 FOR_EACH_VEC_ELT (pending_weak
, pending_weaks
, i
, pe
)
323 decl
= build_decl (UNKNOWN_LOCATION
,
324 FUNCTION_DECL
, alias_id
, default_function_type
);
326 DECL_ARTIFICIAL (decl
) = 1;
327 TREE_PUBLIC (decl
) = 1;
328 DECL_EXTERNAL (decl
) = 1;
329 DECL_WEAK (decl
) = 1;
331 assemble_alias (decl
, id
);
335 /* #pragma weak name [= value] */
337 handle_pragma_weak (cpp_reader
* ARG_UNUSED (dummy
))
339 tree name
, value
, x
, decl
;
344 if (pragma_lex (&name
) != CPP_NAME
)
345 GCC_BAD ("malformed #pragma weak, ignored");
349 if (pragma_lex (&value
) != CPP_NAME
)
350 GCC_BAD ("malformed #pragma weak, ignored");
354 warning (OPT_Wpragmas
, "junk at end of %<#pragma weak%>");
356 decl
= identifier_global_value (name
);
357 if (decl
&& DECL_P (decl
))
359 apply_pragma_weak (decl
, value
);
361 assemble_alias (decl
, value
);
366 pe
= VEC_safe_push (pending_weak
, gc
, pending_weaks
, NULL
);
372 /* GCC supports two #pragma directives for renaming the external
373 symbol associated with a declaration (DECL_ASSEMBLER_NAME), for
374 compatibility with the Solaris and Tru64 system headers. GCC also
375 has its own notation for this, __asm__("name") annotations.
377 Corner cases of these features and their interaction:
379 1) Both pragmas silently apply only to declarations with external
380 linkage (that is, TREE_PUBLIC || DECL_EXTERNAL). Asm labels
381 do not have this restriction.
383 2) In C++, both #pragmas silently apply only to extern "C" declarations.
384 Asm labels do not have this restriction.
386 3) If any of the three ways of changing DECL_ASSEMBLER_NAME is
387 applied to a decl whose DECL_ASSEMBLER_NAME is already set, and the
388 new name is different, a warning issues and the name does not change.
390 4) The "source name" for #pragma redefine_extname is the DECL_NAME,
391 *not* the DECL_ASSEMBLER_NAME.
393 5) If #pragma extern_prefix is in effect and a declaration occurs
394 with an __asm__ name, the #pragma extern_prefix is silently
395 ignored for that declaration.
397 6) If #pragma extern_prefix and #pragma redefine_extname apply to
398 the same declaration, whichever triggered first wins, and a warning
399 is issued. (We would like to have #pragma redefine_extname always
400 win, but it can appear either before or after the declaration, and
401 if it appears afterward, we have no way of knowing whether a modified
402 DECL_ASSEMBLER_NAME is due to #pragma extern_prefix.) */
404 typedef struct GTY(()) pending_redefinition_d
{
407 } pending_redefinition
;
409 DEF_VEC_O(pending_redefinition
);
410 DEF_VEC_ALLOC_O(pending_redefinition
,gc
);
412 static GTY(()) VEC(pending_redefinition
,gc
) *pending_redefine_extname
;
414 static void handle_pragma_redefine_extname (cpp_reader
*);
416 /* #pragma redefine_extname oldname newname */
418 handle_pragma_redefine_extname (cpp_reader
* ARG_UNUSED (dummy
))
420 tree oldname
, newname
, decls
, x
;
424 if (pragma_lex (&oldname
) != CPP_NAME
)
425 GCC_BAD ("malformed #pragma redefine_extname, ignored");
426 if (pragma_lex (&newname
) != CPP_NAME
)
427 GCC_BAD ("malformed #pragma redefine_extname, ignored");
430 warning (OPT_Wpragmas
, "junk at end of %<#pragma redefine_extname%>");
433 for (decls
= c_linkage_bindings (oldname
);
437 if (TREE_CODE (decls
) == TREE_LIST
)
439 decl
= TREE_VALUE (decls
);
440 decls
= TREE_CHAIN (decls
);
448 if ((TREE_PUBLIC (decl
) || DECL_EXTERNAL (decl
))
449 && (TREE_CODE (decl
) == FUNCTION_DECL
450 || TREE_CODE (decl
) == VAR_DECL
))
453 if (DECL_ASSEMBLER_NAME_SET_P (decl
))
455 const char *name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
456 name
= targetm
.strip_name_encoding (name
);
458 if (strcmp (name
, IDENTIFIER_POINTER (newname
)))
459 warning (OPT_Wpragmas
, "#pragma redefine_extname ignored due to "
460 "conflict with previous rename");
463 change_decl_assembler_name (decl
, newname
);
468 /* We have to add this to the rename list even if there's already
469 a global value that doesn't meet the above criteria, because in
470 C++ "struct foo {...};" puts "foo" in the current namespace but
471 does *not* conflict with a subsequent declaration of a function
472 or variable foo. See g++.dg/other/pragma-re-2.C. */
473 add_to_renaming_pragma_list (oldname
, newname
);
476 /* This is called from here and from ia64.c. */
478 add_to_renaming_pragma_list (tree oldname
, tree newname
)
481 pending_redefinition
*p
;
483 FOR_EACH_VEC_ELT (pending_redefinition
, pending_redefine_extname
, ix
, p
)
484 if (oldname
== p
->oldname
)
486 if (p
->newname
!= newname
)
487 warning (OPT_Wpragmas
, "#pragma redefine_extname ignored due to "
488 "conflict with previous #pragma redefine_extname");
492 p
= VEC_safe_push (pending_redefinition
, gc
, pending_redefine_extname
, NULL
);
493 p
->oldname
= oldname
;
494 p
->newname
= newname
;
497 /* The current prefix set by #pragma extern_prefix. */
498 GTY(()) tree pragma_extern_prefix
;
500 /* #pragma extern_prefix "prefix" */
502 handle_pragma_extern_prefix (cpp_reader
* ARG_UNUSED (dummy
))
507 if (pragma_lex (&prefix
) != CPP_STRING
)
508 GCC_BAD ("malformed #pragma extern_prefix, ignored");
511 warning (OPT_Wpragmas
, "junk at end of %<#pragma extern_prefix%>");
513 if (targetm
.handle_pragma_extern_prefix
)
514 /* Note that the length includes the null terminator. */
515 pragma_extern_prefix
= (TREE_STRING_LENGTH (prefix
) > 1 ? prefix
: NULL
);
516 else if (warn_unknown_pragmas
> in_system_header
)
517 warning (OPT_Wunknown_pragmas
,
518 "#pragma extern_prefix not supported on this target");
521 /* Hook from the front ends to apply the results of one of the preceding
522 pragmas that rename variables. */
525 maybe_apply_renaming_pragma (tree decl
, tree asmname
)
528 pending_redefinition
*p
;
530 /* The renaming pragmas are only applied to declarations with
532 if ((TREE_CODE (decl
) != FUNCTION_DECL
&& TREE_CODE (decl
) != VAR_DECL
)
533 || (!TREE_PUBLIC (decl
) && !DECL_EXTERNAL (decl
))
534 || !has_c_linkage (decl
))
537 /* If the DECL_ASSEMBLER_NAME is already set, it does not change,
538 but we may warn about a rename that conflicts. */
539 if (DECL_ASSEMBLER_NAME_SET_P (decl
))
541 const char *oldname
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
542 oldname
= targetm
.strip_name_encoding (oldname
);
544 if (asmname
&& strcmp (TREE_STRING_POINTER (asmname
), oldname
))
545 warning (OPT_Wpragmas
, "asm declaration ignored due to "
546 "conflict with previous rename");
548 /* Take any pending redefine_extname off the list. */
549 FOR_EACH_VEC_ELT (pending_redefinition
, pending_redefine_extname
, ix
, p
)
550 if (DECL_NAME (decl
) == p
->oldname
)
552 /* Only warn if there is a conflict. */
553 if (strcmp (IDENTIFIER_POINTER (p
->newname
), oldname
))
554 warning (OPT_Wpragmas
, "#pragma redefine_extname ignored due to "
555 "conflict with previous rename");
557 VEC_unordered_remove (pending_redefinition
,
558 pending_redefine_extname
, ix
);
564 /* Find out if we have a pending #pragma redefine_extname. */
565 FOR_EACH_VEC_ELT (pending_redefinition
, pending_redefine_extname
, ix
, p
)
566 if (DECL_NAME (decl
) == p
->oldname
)
568 tree newname
= p
->newname
;
569 VEC_unordered_remove (pending_redefinition
,
570 pending_redefine_extname
, ix
);
572 /* If we already have an asmname, #pragma redefine_extname is
573 ignored (with a warning if it conflicts). */
576 if (strcmp (TREE_STRING_POINTER (asmname
),
577 IDENTIFIER_POINTER (newname
)) != 0)
578 warning (OPT_Wpragmas
, "#pragma redefine_extname ignored due to "
579 "conflict with __asm__ declaration");
583 /* Otherwise we use what we've got; #pragma extern_prefix is
585 return build_string (IDENTIFIER_LENGTH (newname
),
586 IDENTIFIER_POINTER (newname
));
589 /* If we've got an asmname, #pragma extern_prefix is silently ignored. */
593 /* If #pragma extern_prefix is in effect, apply it. */
594 if (pragma_extern_prefix
)
596 const char *prefix
= TREE_STRING_POINTER (pragma_extern_prefix
);
597 size_t plen
= TREE_STRING_LENGTH (pragma_extern_prefix
) - 1;
599 const char *id
= IDENTIFIER_POINTER (DECL_NAME (decl
));
600 size_t ilen
= IDENTIFIER_LENGTH (DECL_NAME (decl
));
602 char *newname
= (char *) alloca (plen
+ ilen
+ 1);
604 memcpy (newname
, prefix
, plen
);
605 memcpy (newname
+ plen
, id
, ilen
+ 1);
607 return build_string (plen
+ ilen
, newname
);
615 static void handle_pragma_visibility (cpp_reader
*);
617 static VEC (int, heap
) *visstack
;
619 /* Push the visibility indicated by STR onto the top of the #pragma
620 visibility stack. KIND is 0 for #pragma GCC visibility, 1 for
621 C++ namespace with visibility attribute and 2 for C++ builtin
622 ABI namespace. push_visibility/pop_visibility calls must have
623 matching KIND, it is not allowed to push visibility using one
624 KIND and pop using a different one. */
627 push_visibility (const char *str
, int kind
)
629 VEC_safe_push (int, heap
, visstack
,
630 ((int) default_visibility
) | (kind
<< 8));
631 if (!strcmp (str
, "default"))
632 default_visibility
= VISIBILITY_DEFAULT
;
633 else if (!strcmp (str
, "internal"))
634 default_visibility
= VISIBILITY_INTERNAL
;
635 else if (!strcmp (str
, "hidden"))
636 default_visibility
= VISIBILITY_HIDDEN
;
637 else if (!strcmp (str
, "protected"))
638 default_visibility
= VISIBILITY_PROTECTED
;
640 GCC_BAD ("#pragma GCC visibility push() must specify default, internal, hidden or protected");
641 visibility_options
.inpragma
= 1;
644 /* Pop a level of the #pragma visibility stack. Return true if
648 pop_visibility (int kind
)
650 if (!VEC_length (int, visstack
))
652 if ((VEC_last (int, visstack
) >> 8) != kind
)
655 = (enum symbol_visibility
) (VEC_pop (int, visstack
) & 0xff);
656 visibility_options
.inpragma
657 = VEC_length (int, visstack
) != 0;
661 /* Sets the default visibility for symbols to something other than that
662 specified on the command line. */
665 handle_pragma_visibility (cpp_reader
*dummy ATTRIBUTE_UNUSED
)
667 /* Form is #pragma GCC visibility push(hidden)|pop */
669 enum cpp_ttype token
;
670 enum { bad
, push
, pop
} action
= bad
;
672 token
= pragma_lex (&x
);
673 if (token
== CPP_NAME
)
675 const char *op
= IDENTIFIER_POINTER (x
);
676 if (!strcmp (op
, "push"))
678 else if (!strcmp (op
, "pop"))
682 GCC_BAD ("#pragma GCC visibility must be followed by push or pop");
687 if (! pop_visibility (0))
688 GCC_BAD ("no matching push for %<#pragma GCC visibility pop%>");
692 if (pragma_lex (&x
) != CPP_OPEN_PAREN
)
693 GCC_BAD ("missing %<(%> after %<#pragma GCC visibility push%> - ignored");
694 token
= pragma_lex (&x
);
695 if (token
!= CPP_NAME
)
696 GCC_BAD ("malformed #pragma GCC visibility push");
698 push_visibility (IDENTIFIER_POINTER (x
), 0);
699 if (pragma_lex (&x
) != CPP_CLOSE_PAREN
)
700 GCC_BAD ("missing %<(%> after %<#pragma GCC visibility push%> - ignored");
703 if (pragma_lex (&x
) != CPP_EOF
)
704 warning (OPT_Wpragmas
, "junk at end of %<#pragma GCC visibility%>");
708 handle_pragma_diagnostic(cpp_reader
*ARG_UNUSED(dummy
))
710 const char *kind_string
, *option_string
;
711 unsigned int option_index
;
712 enum cpp_ttype token
;
715 struct cl_option_handlers handlers
;
717 token
= pragma_lex (&x
);
718 if (token
!= CPP_NAME
)
719 GCC_BAD ("missing [error|warning|ignored] after %<#pragma GCC diagnostic%>");
720 kind_string
= IDENTIFIER_POINTER (x
);
721 if (strcmp (kind_string
, "error") == 0)
723 else if (strcmp (kind_string
, "warning") == 0)
725 else if (strcmp (kind_string
, "ignored") == 0)
727 else if (strcmp (kind_string
, "push") == 0)
729 diagnostic_push_diagnostics (global_dc
, input_location
);
732 else if (strcmp (kind_string
, "pop") == 0)
734 diagnostic_pop_diagnostics (global_dc
, input_location
);
738 GCC_BAD ("expected [error|warning|ignored|push|pop] after %<#pragma GCC diagnostic%>");
740 token
= pragma_lex (&x
);
741 if (token
!= CPP_STRING
)
742 GCC_BAD ("missing option after %<#pragma GCC diagnostic%> kind");
743 option_string
= TREE_STRING_POINTER (x
);
744 set_default_handlers (&handlers
);
745 for (option_index
= 0; option_index
< cl_options_count
; option_index
++)
746 if (strcmp (cl_options
[option_index
].opt_text
, option_string
) == 0)
748 control_warning_option (option_index
, (int) kind
, kind
!= DK_IGNORED
,
749 input_location
, c_family_lang_mask
, &handlers
,
750 &global_options
, &global_options_set
,
754 GCC_BAD ("unknown option after %<#pragma GCC diagnostic%> kind");
757 /* Parse #pragma GCC target (xxx) to set target specific options. */
759 handle_pragma_target(cpp_reader
*ARG_UNUSED(dummy
))
761 enum cpp_ttype token
;
763 bool close_paren_needed_p
= false;
767 error ("#pragma GCC option is not allowed inside functions");
771 token
= pragma_lex (&x
);
772 if (token
== CPP_OPEN_PAREN
)
774 close_paren_needed_p
= true;
775 token
= pragma_lex (&x
);
778 if (token
!= CPP_STRING
)
780 GCC_BAD ("%<#pragma GCC option%> is not a string");
784 /* Strings are user options. */
787 tree args
= NULL_TREE
;
791 /* Build up the strings now as a tree linked list. Skip empty
793 if (TREE_STRING_LENGTH (x
) > 0)
794 args
= tree_cons (NULL_TREE
, x
, args
);
796 token
= pragma_lex (&x
);
797 while (token
== CPP_COMMA
)
798 token
= pragma_lex (&x
);
800 while (token
== CPP_STRING
);
802 if (close_paren_needed_p
)
804 if (token
== CPP_CLOSE_PAREN
)
805 token
= pragma_lex (&x
);
807 GCC_BAD ("%<#pragma GCC target (string [,string]...)%> does "
808 "not have a final %<)%>");
811 if (token
!= CPP_EOF
)
813 error ("#pragma GCC target string... is badly formed");
817 /* put arguments in the order the user typed them. */
818 args
= nreverse (args
);
820 if (targetm
.target_option
.pragma_parse (args
, NULL_TREE
))
821 current_target_pragma
= args
;
825 /* Handle #pragma GCC optimize to set optimization options. */
827 handle_pragma_optimize (cpp_reader
*ARG_UNUSED(dummy
))
829 enum cpp_ttype token
;
831 bool close_paren_needed_p
= false;
832 tree optimization_previous_node
= optimization_current_node
;
836 error ("#pragma GCC optimize is not allowed inside functions");
840 token
= pragma_lex (&x
);
841 if (token
== CPP_OPEN_PAREN
)
843 close_paren_needed_p
= true;
844 token
= pragma_lex (&x
);
847 if (token
!= CPP_STRING
&& token
!= CPP_NUMBER
)
849 GCC_BAD ("%<#pragma GCC optimize%> is not a string or number");
853 /* Strings/numbers are user options. */
856 tree args
= NULL_TREE
;
860 /* Build up the numbers/strings now as a list. */
861 if (token
!= CPP_STRING
|| TREE_STRING_LENGTH (x
) > 0)
862 args
= tree_cons (NULL_TREE
, x
, args
);
864 token
= pragma_lex (&x
);
865 while (token
== CPP_COMMA
)
866 token
= pragma_lex (&x
);
868 while (token
== CPP_STRING
|| token
== CPP_NUMBER
);
870 if (close_paren_needed_p
)
872 if (token
== CPP_CLOSE_PAREN
)
873 token
= pragma_lex (&x
);
875 GCC_BAD ("%<#pragma GCC optimize (string [,string]...)%> does "
876 "not have a final %<)%>");
879 if (token
!= CPP_EOF
)
881 error ("#pragma GCC optimize string... is badly formed");
885 /* put arguments in the order the user typed them. */
886 args
= nreverse (args
);
888 parse_optimize_options (args
, false);
889 current_optimize_pragma
= chainon (current_optimize_pragma
, args
);
890 optimization_current_node
= build_optimization_node ();
891 c_cpp_builtins_optimize_pragma (parse_in
,
892 optimization_previous_node
,
893 optimization_current_node
);
897 /* Stack of the #pragma GCC options created with #pragma GCC push_option. Save
898 both the binary representation of the options and the TREE_LIST of
899 strings that will be added to the function's attribute list. */
900 typedef struct GTY(()) opt_stack
{
901 struct opt_stack
*prev
;
904 tree optimize_binary
;
905 tree optimize_strings
;
908 static GTY(()) struct opt_stack
* options_stack
;
910 /* Handle #pragma GCC push_options to save the current target and optimization
914 handle_pragma_push_options (cpp_reader
*ARG_UNUSED(dummy
))
916 enum cpp_ttype token
;
920 token
= pragma_lex (&x
);
921 if (token
!= CPP_EOF
)
923 warning (OPT_Wpragmas
, "junk at end of %<#pragma push_options%>");
927 p
= ggc_alloc_opt_stack ();
928 p
->prev
= options_stack
;
931 /* Save optimization and target flags in binary format. */
932 p
->optimize_binary
= build_optimization_node ();
933 p
->target_binary
= build_target_option_node ();
935 /* Save optimization and target flags in string list format. */
936 p
->optimize_strings
= copy_list (current_optimize_pragma
);
937 p
->target_strings
= copy_list (current_target_pragma
);
940 /* Handle #pragma GCC pop_options to restore the current target and
941 optimization options from a previous push_options. */
944 handle_pragma_pop_options (cpp_reader
*ARG_UNUSED(dummy
))
946 enum cpp_ttype token
;
950 token
= pragma_lex (&x
);
951 if (token
!= CPP_EOF
)
953 warning (OPT_Wpragmas
, "junk at end of %<#pragma pop_options%>");
959 warning (OPT_Wpragmas
,
960 "%<#pragma GCC pop_options%> without a corresponding "
961 "%<#pragma GCC push_options%>");
966 options_stack
= p
->prev
;
968 if (p
->target_binary
!= target_option_current_node
)
970 (void) targetm
.target_option
.pragma_parse (NULL_TREE
, p
->target_binary
);
971 target_option_current_node
= p
->target_binary
;
974 if (p
->optimize_binary
!= optimization_current_node
)
976 tree old_optimize
= optimization_current_node
;
977 cl_optimization_restore (&global_options
,
978 TREE_OPTIMIZATION (p
->optimize_binary
));
979 c_cpp_builtins_optimize_pragma (parse_in
, old_optimize
,
981 optimization_current_node
= p
->optimize_binary
;
984 current_target_pragma
= p
->target_strings
;
985 current_optimize_pragma
= p
->optimize_strings
;
988 /* Handle #pragma GCC reset_options to restore the current target and
989 optimization options to the original options used on the command line. */
992 handle_pragma_reset_options (cpp_reader
*ARG_UNUSED(dummy
))
994 enum cpp_ttype token
;
996 tree new_optimize
= optimization_default_node
;
997 tree new_target
= target_option_default_node
;
999 token
= pragma_lex (&x
);
1000 if (token
!= CPP_EOF
)
1002 warning (OPT_Wpragmas
, "junk at end of %<#pragma reset_options%>");
1006 if (new_target
!= target_option_current_node
)
1008 (void) targetm
.target_option
.pragma_parse (NULL_TREE
, new_target
);
1009 target_option_current_node
= new_target
;
1012 if (new_optimize
!= optimization_current_node
)
1014 tree old_optimize
= optimization_current_node
;
1015 cl_optimization_restore (&global_options
,
1016 TREE_OPTIMIZATION (new_optimize
));
1017 c_cpp_builtins_optimize_pragma (parse_in
, old_optimize
, new_optimize
);
1018 optimization_current_node
= new_optimize
;
1021 current_target_pragma
= NULL_TREE
;
1022 current_optimize_pragma
= NULL_TREE
;
1025 /* Print a plain user-specified message. */
1028 handle_pragma_message (cpp_reader
*ARG_UNUSED(dummy
))
1030 enum cpp_ttype token
;
1031 tree x
, message
= 0;
1033 token
= pragma_lex (&x
);
1034 if (token
== CPP_OPEN_PAREN
)
1036 token
= pragma_lex (&x
);
1037 if (token
== CPP_STRING
)
1040 GCC_BAD ("expected a string after %<#pragma message%>");
1041 if (pragma_lex (&x
) != CPP_CLOSE_PAREN
)
1042 GCC_BAD ("malformed %<#pragma message%>, ignored");
1044 else if (token
== CPP_STRING
)
1047 GCC_BAD ("expected a string after %<#pragma message%>");
1049 gcc_assert (message
);
1051 if (pragma_lex (&x
) != CPP_EOF
)
1052 warning (OPT_Wpragmas
, "junk at end of %<#pragma message%>");
1054 if (TREE_STRING_LENGTH (message
) > 1)
1055 inform (input_location
, "#pragma message: %s", TREE_STRING_POINTER (message
));
1058 /* Mark whether the current location is valid for a STDC pragma. */
1060 static bool valid_location_for_stdc_pragma
;
1063 mark_valid_location_for_stdc_pragma (bool flag
)
1065 valid_location_for_stdc_pragma
= flag
;
1068 /* Return true if the current location is valid for a STDC pragma. */
1071 valid_location_for_stdc_pragma_p (void)
1073 return valid_location_for_stdc_pragma
;
1076 enum pragma_switch_t
{ PRAGMA_ON
, PRAGMA_OFF
, PRAGMA_DEFAULT
, PRAGMA_BAD
};
1078 /* A STDC pragma must appear outside of external declarations or
1079 preceding all explicit declarations and statements inside a compound
1080 statement; its behavior is undefined if used in any other context.
1081 It takes a switch of ON, OFF, or DEFAULT. */
1083 static enum pragma_switch_t
1084 handle_stdc_pragma (const char *pname
)
1088 enum pragma_switch_t ret
;
1090 if (!valid_location_for_stdc_pragma_p ())
1092 warning (OPT_Wpragmas
, "invalid location for %<pragma %s%>, ignored",
1097 if (pragma_lex (&t
) != CPP_NAME
)
1099 warning (OPT_Wpragmas
, "malformed %<#pragma %s%>, ignored", pname
);
1103 arg
= IDENTIFIER_POINTER (t
);
1105 if (!strcmp (arg
, "ON"))
1107 else if (!strcmp (arg
, "OFF"))
1109 else if (!strcmp (arg
, "DEFAULT"))
1110 ret
= PRAGMA_DEFAULT
;
1113 warning (OPT_Wpragmas
, "malformed %<#pragma %s%>, ignored", pname
);
1117 if (pragma_lex (&t
) != CPP_EOF
)
1119 warning (OPT_Wpragmas
, "junk at end of %<#pragma %s%>", pname
);
1126 /* #pragma STDC FLOAT_CONST_DECIMAL64 ON
1127 #pragma STDC FLOAT_CONST_DECIMAL64 OFF
1128 #pragma STDC FLOAT_CONST_DECIMAL64 DEFAULT */
1131 handle_pragma_float_const_decimal64 (cpp_reader
*ARG_UNUSED (dummy
))
1133 if (c_dialect_cxx ())
1135 if (warn_unknown_pragmas
> in_system_header
)
1136 warning (OPT_Wunknown_pragmas
,
1137 "%<#pragma STDC FLOAT_CONST_DECIMAL64%> is not supported"
1142 if (!targetm
.decimal_float_supported_p ())
1144 if (warn_unknown_pragmas
> in_system_header
)
1145 warning (OPT_Wunknown_pragmas
,
1146 "%<#pragma STDC FLOAT_CONST_DECIMAL64%> is not supported"
1151 pedwarn (input_location
, OPT_pedantic
,
1152 "ISO C does not support %<#pragma STDC FLOAT_CONST_DECIMAL64%>");
1154 switch (handle_stdc_pragma ("STDC FLOAT_CONST_DECIMAL64"))
1157 set_float_const_decimal64 ();
1160 case PRAGMA_DEFAULT
:
1161 clear_float_const_decimal64 ();
1168 /* A vector of registered pragma callbacks, which is never freed. */
1169 DEF_VEC_O (internal_pragma_handler
);
1170 DEF_VEC_ALLOC_O (internal_pragma_handler
, heap
);
1172 static VEC(internal_pragma_handler
, heap
) *registered_pragmas
;
1180 DEF_VEC_O (pragma_ns_name
);
1181 DEF_VEC_ALLOC_O (pragma_ns_name
, heap
);
1183 static VEC(pragma_ns_name
, heap
) *registered_pp_pragmas
;
1185 struct omp_pragma_def
{ const char *name
; unsigned int id
; };
1186 static const struct omp_pragma_def omp_pragmas
[] = {
1187 { "atomic", PRAGMA_OMP_ATOMIC
},
1188 { "barrier", PRAGMA_OMP_BARRIER
},
1189 { "critical", PRAGMA_OMP_CRITICAL
},
1190 { "flush", PRAGMA_OMP_FLUSH
},
1191 { "for", PRAGMA_OMP_FOR
},
1192 { "master", PRAGMA_OMP_MASTER
},
1193 { "ordered", PRAGMA_OMP_ORDERED
},
1194 { "parallel", PRAGMA_OMP_PARALLEL
},
1195 { "section", PRAGMA_OMP_SECTION
},
1196 { "sections", PRAGMA_OMP_SECTIONS
},
1197 { "single", PRAGMA_OMP_SINGLE
},
1198 { "task", PRAGMA_OMP_TASK
},
1199 { "taskwait", PRAGMA_OMP_TASKWAIT
},
1200 { "taskyield", PRAGMA_OMP_TASKYIELD
},
1201 { "threadprivate", PRAGMA_OMP_THREADPRIVATE
}
1205 c_pp_lookup_pragma (unsigned int id
, const char **space
, const char **name
)
1207 const int n_omp_pragmas
= sizeof (omp_pragmas
) / sizeof (*omp_pragmas
);
1210 for (i
= 0; i
< n_omp_pragmas
; ++i
)
1211 if (omp_pragmas
[i
].id
== id
)
1214 *name
= omp_pragmas
[i
].name
;
1218 if (id
>= PRAGMA_FIRST_EXTERNAL
1219 && (id
< PRAGMA_FIRST_EXTERNAL
1220 + VEC_length (pragma_ns_name
, registered_pp_pragmas
)))
1222 *space
= VEC_index (pragma_ns_name
, registered_pp_pragmas
,
1223 id
- PRAGMA_FIRST_EXTERNAL
)->space
;
1224 *name
= VEC_index (pragma_ns_name
, registered_pp_pragmas
,
1225 id
- PRAGMA_FIRST_EXTERNAL
)->name
;
1232 /* Front-end wrappers for pragma registration to avoid dragging
1233 cpplib.h in almost everywhere. */
1236 c_register_pragma_1 (const char *space
, const char *name
,
1237 internal_pragma_handler ihandler
, bool allow_expansion
)
1241 if (flag_preprocess_only
)
1243 pragma_ns_name ns_name
;
1245 if (!allow_expansion
)
1248 ns_name
.space
= space
;
1249 ns_name
.name
= name
;
1250 VEC_safe_push (pragma_ns_name
, heap
, registered_pp_pragmas
, &ns_name
);
1251 id
= VEC_length (pragma_ns_name
, registered_pp_pragmas
);
1252 id
+= PRAGMA_FIRST_EXTERNAL
- 1;
1256 VEC_safe_push (internal_pragma_handler
, heap
, registered_pragmas
,
1258 id
= VEC_length (internal_pragma_handler
, registered_pragmas
);
1259 id
+= PRAGMA_FIRST_EXTERNAL
- 1;
1261 /* The C++ front end allocates 6 bits in cp_token; the C front end
1262 allocates 7 bits in c_token. At present this is sufficient. */
1263 gcc_assert (id
< 64);
1266 cpp_register_deferred_pragma (parse_in
, space
, name
, id
,
1267 allow_expansion
, false);
1270 /* Register a C pragma handler, using a space and a name. It disallows pragma
1271 expansion (if you want it, use c_register_pragma_with_expansion instead). */
1273 c_register_pragma (const char *space
, const char *name
,
1274 pragma_handler_1arg handler
)
1276 internal_pragma_handler ihandler
;
1278 ihandler
.handler
.handler_1arg
= handler
;
1279 ihandler
.extra_data
= false;
1280 ihandler
.data
= NULL
;
1281 c_register_pragma_1 (space
, name
, ihandler
, false);
1284 /* Register a C pragma handler, using a space and a name, it also carries an
1285 extra data field which can be used by the handler. It disallows pragma
1286 expansion (if you want it, use c_register_pragma_with_expansion_and_data
1289 c_register_pragma_with_data (const char *space
, const char *name
,
1290 pragma_handler_2arg handler
, void * data
)
1292 internal_pragma_handler ihandler
;
1294 ihandler
.handler
.handler_2arg
= handler
;
1295 ihandler
.extra_data
= true;
1296 ihandler
.data
= data
;
1297 c_register_pragma_1 (space
, name
, ihandler
, false);
1300 /* Register a C pragma handler, using a space and a name. It allows pragma
1301 expansion as in the following example:
1304 #pragma count (NUMBER)
1306 Name expansion is still disallowed. */
1308 c_register_pragma_with_expansion (const char *space
, const char *name
,
1309 pragma_handler_1arg handler
)
1311 internal_pragma_handler ihandler
;
1313 ihandler
.handler
.handler_1arg
= handler
;
1314 ihandler
.extra_data
= false;
1315 ihandler
.data
= NULL
;
1316 c_register_pragma_1 (space
, name
, ihandler
, true);
1319 /* Register a C pragma handler, using a space and a name, it also carries an
1320 extra data field which can be used by the handler. It allows pragma
1321 expansion as in the following example:
1324 #pragma count (NUMBER)
1326 Name expansion is still disallowed. */
1328 c_register_pragma_with_expansion_and_data (const char *space
, const char *name
,
1329 pragma_handler_2arg handler
,
1332 internal_pragma_handler ihandler
;
1334 ihandler
.handler
.handler_2arg
= handler
;
1335 ihandler
.extra_data
= true;
1336 ihandler
.data
= data
;
1337 c_register_pragma_1 (space
, name
, ihandler
, true);
1341 c_invoke_pragma_handler (unsigned int id
)
1343 internal_pragma_handler
*ihandler
;
1344 pragma_handler_1arg handler_1arg
;
1345 pragma_handler_2arg handler_2arg
;
1347 id
-= PRAGMA_FIRST_EXTERNAL
;
1348 ihandler
= VEC_index (internal_pragma_handler
, registered_pragmas
, id
);
1349 if (ihandler
->extra_data
)
1351 handler_2arg
= ihandler
->handler
.handler_2arg
;
1352 handler_2arg (parse_in
, ihandler
->data
);
1356 handler_1arg
= ihandler
->handler
.handler_1arg
;
1357 handler_1arg (parse_in
);
1361 /* Set up front-end pragmas. */
1367 const int n_omp_pragmas
= sizeof (omp_pragmas
) / sizeof (*omp_pragmas
);
1370 for (i
= 0; i
< n_omp_pragmas
; ++i
)
1371 cpp_register_deferred_pragma (parse_in
, "omp", omp_pragmas
[i
].name
,
1372 omp_pragmas
[i
].id
, true, true);
1375 if (!flag_preprocess_only
)
1376 cpp_register_deferred_pragma (parse_in
, "GCC", "pch_preprocess",
1377 PRAGMA_GCC_PCH_PREPROCESS
, false, false);
1379 #ifdef HANDLE_PRAGMA_PACK_WITH_EXPANSION
1380 c_register_pragma_with_expansion (0, "pack", handle_pragma_pack
);
1382 c_register_pragma (0, "pack", handle_pragma_pack
);
1384 c_register_pragma (0, "weak", handle_pragma_weak
);
1385 c_register_pragma ("GCC", "visibility", handle_pragma_visibility
);
1387 c_register_pragma ("GCC", "diagnostic", handle_pragma_diagnostic
);
1388 c_register_pragma ("GCC", "target", handle_pragma_target
);
1389 c_register_pragma ("GCC", "optimize", handle_pragma_optimize
);
1390 c_register_pragma ("GCC", "push_options", handle_pragma_push_options
);
1391 c_register_pragma ("GCC", "pop_options", handle_pragma_pop_options
);
1392 c_register_pragma ("GCC", "reset_options", handle_pragma_reset_options
);
1394 c_register_pragma ("STDC", "FLOAT_CONST_DECIMAL64",
1395 handle_pragma_float_const_decimal64
);
1397 c_register_pragma_with_expansion (0, "redefine_extname",
1398 handle_pragma_redefine_extname
);
1399 c_register_pragma (0, "extern_prefix", handle_pragma_extern_prefix
);
1401 c_register_pragma_with_expansion (0, "message", handle_pragma_message
);
1403 #ifdef REGISTER_TARGET_PRAGMAS
1404 REGISTER_TARGET_PRAGMAS ();
1407 /* Allow plugins to register their own pragmas. */
1408 invoke_plugin_callbacks (PLUGIN_PRAGMAS
, NULL
);
1411 #include "gt-c-family-c-pragma.h"