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, 2012 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? */
35 #include "tm_p.h" /* For REGISTER_TARGET_PRAGMAS (why is
36 this not a target hook?). */
40 #include "diagnostic.h"
44 #define GCC_BAD(gmsgid) \
45 do { warning (OPT_Wpragmas, gmsgid); return; } while (0)
46 #define GCC_BAD2(gmsgid, arg) \
47 do { warning (OPT_Wpragmas, gmsgid, arg); return; } while (0)
49 typedef struct GTY(()) align_stack
{
52 struct align_stack
* prev
;
55 static GTY(()) struct align_stack
* alignment_stack
;
57 static void handle_pragma_pack (cpp_reader
*);
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_alloc_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
;
131 #pragma pack (push, N)
132 #pragma pack (push, ID)
133 #pragma pack (push, ID, N)
135 #pragma pack (pop, ID) */
137 handle_pragma_pack (cpp_reader
* ARG_UNUSED (dummy
))
141 enum cpp_ttype token
;
142 enum { set
, push
, pop
} action
;
144 if (pragma_lex (&x
) != CPP_OPEN_PAREN
)
145 GCC_BAD ("missing %<(%> after %<#pragma pack%> - ignored");
147 token
= pragma_lex (&x
);
148 if (token
== CPP_CLOSE_PAREN
)
151 align
= initial_max_fld_align
;
153 else if (token
== CPP_NUMBER
)
155 if (TREE_CODE (x
) != INTEGER_CST
)
156 GCC_BAD ("invalid constant in %<#pragma pack%> - ignored");
157 align
= TREE_INT_CST_LOW (x
);
159 if (pragma_lex (&x
) != CPP_CLOSE_PAREN
)
160 GCC_BAD ("malformed %<#pragma pack%> - ignored");
162 else if (token
== CPP_NAME
)
164 #define GCC_BAD_ACTION do { if (action != pop) \
165 GCC_BAD ("malformed %<#pragma pack(push[, id][, <n>])%> - ignored"); \
167 GCC_BAD ("malformed %<#pragma pack(pop[, id])%> - ignored"); \
170 const char *op
= IDENTIFIER_POINTER (x
);
171 if (!strcmp (op
, "push"))
173 else if (!strcmp (op
, "pop"))
176 GCC_BAD2 ("unknown action %qE for %<#pragma pack%> - ignored", x
);
178 while ((token
= pragma_lex (&x
)) == CPP_COMMA
)
180 token
= pragma_lex (&x
);
181 if (token
== CPP_NAME
&& id
== 0)
185 else if (token
== CPP_NUMBER
&& action
== push
&& align
== -1)
187 if (TREE_CODE (x
) != INTEGER_CST
)
188 GCC_BAD ("invalid constant in %<#pragma pack%> - ignored");
189 align
= TREE_INT_CST_LOW (x
);
197 if (token
!= CPP_CLOSE_PAREN
)
199 #undef GCC_BAD_ACTION
202 GCC_BAD ("malformed %<#pragma pack%> - ignored");
204 if (pragma_lex (&x
) != CPP_EOF
)
205 warning (OPT_Wpragmas
, "junk at end of %<#pragma pack%>");
207 if (flag_pack_struct
)
208 GCC_BAD ("#pragma pack has no effect with -fpack-struct - ignored");
219 align
*= BITS_PER_UNIT
;
224 align
= maximum_field_alignment
;
228 GCC_BAD2 ("alignment must be a small power of two, not %d", align
);
233 case set
: SET_GLOBAL_ALIGNMENT (align
); break;
234 case push
: push_alignment (align
, id
); break;
235 case pop
: pop_alignment (id
); break;
239 typedef struct GTY(()) pending_weak_d
245 DEF_VEC_O(pending_weak
);
246 DEF_VEC_ALLOC_O(pending_weak
,gc
);
248 static GTY(()) VEC(pending_weak
,gc
) *pending_weaks
;
250 static void apply_pragma_weak (tree
, tree
);
251 static void handle_pragma_weak (cpp_reader
*);
254 apply_pragma_weak (tree decl
, tree value
)
258 value
= build_string (IDENTIFIER_LENGTH (value
),
259 IDENTIFIER_POINTER (value
));
260 decl_attributes (&decl
, build_tree_list (get_identifier ("alias"),
261 build_tree_list (NULL
, value
)),
265 if (SUPPORTS_WEAK
&& DECL_EXTERNAL (decl
) && TREE_USED (decl
)
266 && !DECL_WEAK (decl
) /* Don't complain about a redundant #pragma. */
267 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
268 warning (OPT_Wpragmas
, "applying #pragma weak %q+D after first use "
269 "results in unspecified behavior", decl
);
275 maybe_apply_pragma_weak (tree decl
)
281 /* Avoid asking for DECL_ASSEMBLER_NAME when it's not needed. */
283 /* No weak symbols pending, take the short-cut. */
286 /* If it's not visible outside this file, it doesn't matter whether
288 if (!DECL_EXTERNAL (decl
) && !TREE_PUBLIC (decl
))
290 /* If it's not a function or a variable, it can't be weak.
291 FIXME: what kinds of things are visible outside this file but
292 aren't functions or variables? Should this be an assert instead? */
293 if (TREE_CODE (decl
) != FUNCTION_DECL
&& TREE_CODE (decl
) != VAR_DECL
)
296 id
= DECL_ASSEMBLER_NAME (decl
);
298 FOR_EACH_VEC_ELT (pending_weak
, pending_weaks
, i
, pe
)
301 apply_pragma_weak (decl
, pe
->value
);
302 VEC_unordered_remove (pending_weak
, pending_weaks
, i
);
307 /* Process all "#pragma weak A = B" directives where we have not seen
310 maybe_apply_pending_pragma_weaks (void)
312 tree alias_id
, id
, decl
;
316 FOR_EACH_VEC_ELT (pending_weak
, pending_weaks
, i
, pe
)
324 decl
= build_decl (UNKNOWN_LOCATION
,
325 FUNCTION_DECL
, alias_id
, default_function_type
);
327 DECL_ARTIFICIAL (decl
) = 1;
328 TREE_PUBLIC (decl
) = 1;
329 DECL_EXTERNAL (decl
) = 1;
330 DECL_WEAK (decl
) = 1;
332 assemble_alias (decl
, id
);
336 /* #pragma weak name [= value] */
338 handle_pragma_weak (cpp_reader
* ARG_UNUSED (dummy
))
340 tree name
, value
, x
, decl
;
345 if (pragma_lex (&name
) != CPP_NAME
)
346 GCC_BAD ("malformed #pragma weak, ignored");
350 if (pragma_lex (&value
) != CPP_NAME
)
351 GCC_BAD ("malformed #pragma weak, ignored");
355 warning (OPT_Wpragmas
, "junk at end of %<#pragma weak%>");
357 decl
= identifier_global_value (name
);
358 if (decl
&& DECL_P (decl
))
360 apply_pragma_weak (decl
, value
);
362 assemble_alias (decl
, value
);
367 pe
= VEC_safe_push (pending_weak
, gc
, pending_weaks
, NULL
);
373 /* GCC supports two #pragma directives for renaming the external
374 symbol associated with a declaration (DECL_ASSEMBLER_NAME), for
375 compatibility with the Solaris and VMS system headers. GCC also
376 has its own notation for this, __asm__("name") annotations.
378 Corner cases of these features and their interaction:
380 1) Both pragmas silently apply only to declarations with external
381 linkage (that is, TREE_PUBLIC || DECL_EXTERNAL). Asm labels
382 do not have this restriction.
384 2) In C++, both #pragmas silently apply only to extern "C" declarations.
385 Asm labels do not have this restriction.
387 3) If any of the three ways of changing DECL_ASSEMBLER_NAME is
388 applied to a decl whose DECL_ASSEMBLER_NAME is already set, and the
389 new name is different, a warning issues and the name does not change.
391 4) The "source name" for #pragma redefine_extname is the DECL_NAME,
392 *not* the DECL_ASSEMBLER_NAME.
394 5) If #pragma extern_prefix is in effect and a declaration occurs
395 with an __asm__ name, the #pragma extern_prefix is silently
396 ignored for that declaration.
398 6) If #pragma extern_prefix and #pragma redefine_extname apply to
399 the same declaration, whichever triggered first wins, and a warning
400 is issued. (We would like to have #pragma redefine_extname always
401 win, but it can appear either before or after the declaration, and
402 if it appears afterward, we have no way of knowing whether a modified
403 DECL_ASSEMBLER_NAME is due to #pragma extern_prefix.) */
405 typedef struct GTY(()) pending_redefinition_d
{
408 } pending_redefinition
;
410 DEF_VEC_O(pending_redefinition
);
411 DEF_VEC_ALLOC_O(pending_redefinition
,gc
);
413 static GTY(()) VEC(pending_redefinition
,gc
) *pending_redefine_extname
;
415 static void handle_pragma_redefine_extname (cpp_reader
*);
417 /* #pragma redefine_extname oldname newname */
419 handle_pragma_redefine_extname (cpp_reader
* ARG_UNUSED (dummy
))
421 tree oldname
, newname
, decls
, x
;
425 if (pragma_lex (&oldname
) != CPP_NAME
)
426 GCC_BAD ("malformed #pragma redefine_extname, ignored");
427 if (pragma_lex (&newname
) != CPP_NAME
)
428 GCC_BAD ("malformed #pragma redefine_extname, ignored");
431 warning (OPT_Wpragmas
, "junk at end of %<#pragma redefine_extname%>");
434 for (decls
= c_linkage_bindings (oldname
);
438 if (TREE_CODE (decls
) == TREE_LIST
)
440 decl
= TREE_VALUE (decls
);
441 decls
= TREE_CHAIN (decls
);
449 if ((TREE_PUBLIC (decl
) || DECL_EXTERNAL (decl
))
450 && (TREE_CODE (decl
) == FUNCTION_DECL
451 || TREE_CODE (decl
) == VAR_DECL
))
454 if (DECL_ASSEMBLER_NAME_SET_P (decl
))
456 const char *name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
457 name
= targetm
.strip_name_encoding (name
);
459 if (strcmp (name
, IDENTIFIER_POINTER (newname
)))
460 warning (OPT_Wpragmas
, "#pragma redefine_extname ignored due to "
461 "conflict with previous rename");
464 change_decl_assembler_name (decl
, newname
);
469 /* We have to add this to the rename list even if there's already
470 a global value that doesn't meet the above criteria, because in
471 C++ "struct foo {...};" puts "foo" in the current namespace but
472 does *not* conflict with a subsequent declaration of a function
473 or variable foo. See g++.dg/other/pragma-re-2.C. */
474 add_to_renaming_pragma_list (oldname
, newname
);
477 /* This is called from here and from ia64.c. */
479 add_to_renaming_pragma_list (tree oldname
, tree newname
)
482 pending_redefinition
*p
;
484 FOR_EACH_VEC_ELT (pending_redefinition
, pending_redefine_extname
, ix
, p
)
485 if (oldname
== p
->oldname
)
487 if (p
->newname
!= newname
)
488 warning (OPT_Wpragmas
, "#pragma redefine_extname ignored due to "
489 "conflict with previous #pragma redefine_extname");
493 p
= VEC_safe_push (pending_redefinition
, gc
, pending_redefine_extname
, NULL
);
494 p
->oldname
= oldname
;
495 p
->newname
= newname
;
498 /* The current prefix set by #pragma extern_prefix. */
499 GTY(()) tree pragma_extern_prefix
;
501 /* variables used to implement #pragma upc semantics */
502 #ifndef UPC_CMODE_STACK_INCREMENT
503 #define UPC_CMODE_STACK_INCREMENT 32
505 static int pragma_upc_permitted
;
506 static int upc_cmode
;
507 static int *upc_cmode_stack
;
508 static int upc_cmode_stack_in_use
;
509 static int upc_cmode_stack_allocated
;
511 static void init_pragma_upc (void);
512 static void handle_pragma_upc (cpp_reader
* ARG_UNUSED (dummy
));
514 /* Initialize the variables used to manage the current UPC consistency
515 mode (strict/relaxed) */
518 init_pragma_upc (void)
520 pragma_upc_permitted
= 0;
522 upc_cmode_stack
= (int *) xcalloc (UPC_CMODE_STACK_INCREMENT
,
524 upc_cmode_stack_allocated
= UPC_CMODE_STACK_INCREMENT
;
525 upc_cmode_stack_in_use
= 0;
530 * #pragma upc relaxed
531 * #pragma upc upc_code
535 handle_pragma_upc (cpp_reader
* ARG_UNUSED (dummy
))
539 enum upc_pragma_op
{p_strict
, p_relaxed
, p_upc_code
,
540 p_c_code
, p_detect_upc
, p_unknown
};
541 enum upc_pragma_op upc_pragma
= p_unknown
;
545 warning (OPT_Wpragmas
, "#pragma upc found in non-UPC source file");
552 const char *op
= IDENTIFIER_POINTER (x
);
553 if (!strcmp (op
, "strict"))
554 upc_pragma
= p_strict
;
555 else if (!strcmp (op
, "relaxed"))
556 upc_pragma
= p_relaxed
;
557 else if (!strcmp (op
, "upc_code"))
558 upc_pragma
= p_upc_code
;
559 else if (!strcmp (op
, "c_code"))
560 upc_pragma
= p_c_code
;
561 else if (!strcmp (op
, "detect_upc"))
563 const char *detect_op
;
564 upc_pragma
= p_detect_upc
;
567 GCC_BAD ("missing [suspend_insertion|resume_insertion]"
568 " after %<#pragma UPC detect_upc%>");
569 detect_op
= IDENTIFIER_POINTER (x
);
570 if (strcmp (detect_op
, "suspend_insertion") == 0)
572 else if (strcmp (detect_op
, "resume_insertion") == 0)
575 GCC_BAD ("expected [suspend_insertion|resume_insertion]"
576 " after %<#pragma UPC detect_upc%>");
579 GCC_BAD2 ("unknown action '%s' for '#pragma upc' - ignored", op
);
582 warning (OPT_Wpragmas
, "missing parameter after #pragma upc");
586 warning (OPT_Wpragmas
, "junk at end of #pragma upc");
588 if ((upc_pragma
== p_strict
) || (upc_pragma
== p_relaxed
))
590 if (pragma_upc_permitted_p ())
592 int consistency_mode
= (upc_pragma
== p_strict
);
593 set_upc_consistency_mode (consistency_mode
);
596 warning (OPT_Wpragmas
, "#pragma upc not allowed in this context");
598 else if ((upc_pragma
== p_upc_code
) || (upc_pragma
== p_c_code
))
600 compiling_upc
= (upc_pragma
== p_upc_code
);
602 else if (upc_pragma
== p_detect_upc
)
604 /* Skip: this is a Berkeley-specific pragma that requires no action. */
608 /* Set the current setting of the UPC consistency mode
609 that is in effect. */
612 set_upc_consistency_mode (int mode
)
617 /* Return the current setting of the UPC consistency mode. */
620 get_upc_consistency_mode (void)
625 /* Called from the parser just after the bracket that opens a compound
626 statement has been parsed. Set the flag that allows the pragma
630 permit_pragma_upc (void)
632 pragma_upc_permitted
= 1;
635 /* Called just before the body of a compound statement is parsed.
636 Clear the flag that allows the pragma. */
639 deny_pragma_upc (void)
641 pragma_upc_permitted
= 0;
644 /* A #pragma upc is permitted either at the outermost scope,
645 or directly after the bracket that opens a compound statement. */
648 pragma_upc_permitted_p (void)
650 return !current_function_decl
|| pragma_upc_permitted
;
653 /* Called at the beginning of every compound statement.
654 Pushes the old value of the current UPC consistency mode
658 push_upc_consistency_mode (void)
660 if (upc_cmode_stack_in_use
== upc_cmode_stack_allocated
)
662 upc_cmode_stack_allocated
+= UPC_CMODE_STACK_INCREMENT
;
663 upc_cmode_stack
= (int *) xrealloc (upc_cmode_stack
,
664 upc_cmode_stack_allocated
* sizeof (int));
666 upc_cmode_stack
[upc_cmode_stack_in_use
++] = upc_cmode
;
669 /* Called at the end of every compound statement.
670 Sets the current consistency mode to the previously saved value. */
673 pop_upc_consistency_mode (void)
675 if (upc_cmode_stack_in_use
<= 0)
677 upc_cmode
= upc_cmode_stack
[--upc_cmode_stack_in_use
];
680 static int pragma_pupc_on
;
681 static void init_pragma_pupc (void);
682 static void handle_pragma_pupc (cpp_reader
*);
684 /* Pragma pupc defaults to being on */
686 init_pragma_pupc (void)
692 get_upc_pupc_mode (void)
694 return pragma_pupc_on
;
698 disable_pupc_mode (void)
700 int old_pupc
= pragma_pupc_on
;
706 set_pupc_mode (int new_pupc
)
708 pragma_pupc_on
= new_pupc
;
716 handle_pragma_pupc (cpp_reader
*dummy ATTRIBUTE_UNUSED
)
723 const char *op
= IDENTIFIER_POINTER (x
);
724 if (!strcmp (op
, "on"))
726 else if (!strcmp (op
, "off"))
729 GCC_BAD2 ("unknown action '%s' for '#pragma pupc' - ignored", op
);
734 warning (OPT_Wpragmas
, "junk at end of #pragma pupc");
737 /* Hook from the front ends to apply the results of one of the preceding
738 pragmas that rename variables. */
741 maybe_apply_renaming_pragma (tree decl
, tree asmname
)
744 pending_redefinition
*p
;
746 /* The renaming pragmas are only applied to declarations with
748 if ((TREE_CODE (decl
) != FUNCTION_DECL
&& TREE_CODE (decl
) != VAR_DECL
)
749 || (!TREE_PUBLIC (decl
) && !DECL_EXTERNAL (decl
))
750 || !has_c_linkage (decl
))
753 /* If the DECL_ASSEMBLER_NAME is already set, it does not change,
754 but we may warn about a rename that conflicts. */
755 if (DECL_ASSEMBLER_NAME_SET_P (decl
))
757 const char *oldname
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
758 oldname
= targetm
.strip_name_encoding (oldname
);
760 if (asmname
&& strcmp (TREE_STRING_POINTER (asmname
), oldname
))
761 warning (OPT_Wpragmas
, "asm declaration ignored due to "
762 "conflict with previous rename");
764 /* Take any pending redefine_extname off the list. */
765 FOR_EACH_VEC_ELT (pending_redefinition
, pending_redefine_extname
, ix
, p
)
766 if (DECL_NAME (decl
) == p
->oldname
)
768 /* Only warn if there is a conflict. */
769 if (strcmp (IDENTIFIER_POINTER (p
->newname
), oldname
))
770 warning (OPT_Wpragmas
, "#pragma redefine_extname ignored due to "
771 "conflict with previous rename");
773 VEC_unordered_remove (pending_redefinition
,
774 pending_redefine_extname
, ix
);
780 /* Find out if we have a pending #pragma redefine_extname. */
781 FOR_EACH_VEC_ELT (pending_redefinition
, pending_redefine_extname
, ix
, p
)
782 if (DECL_NAME (decl
) == p
->oldname
)
784 tree newname
= p
->newname
;
785 VEC_unordered_remove (pending_redefinition
,
786 pending_redefine_extname
, ix
);
788 /* If we already have an asmname, #pragma redefine_extname is
789 ignored (with a warning if it conflicts). */
792 if (strcmp (TREE_STRING_POINTER (asmname
),
793 IDENTIFIER_POINTER (newname
)) != 0)
794 warning (OPT_Wpragmas
, "#pragma redefine_extname ignored due to "
795 "conflict with __asm__ declaration");
799 /* Otherwise we use what we've got; #pragma extern_prefix is
801 return build_string (IDENTIFIER_LENGTH (newname
),
802 IDENTIFIER_POINTER (newname
));
805 /* If we've got an asmname, #pragma extern_prefix is silently ignored. */
809 /* If #pragma extern_prefix is in effect, apply it. */
810 if (pragma_extern_prefix
)
812 const char *prefix
= TREE_STRING_POINTER (pragma_extern_prefix
);
813 size_t plen
= TREE_STRING_LENGTH (pragma_extern_prefix
) - 1;
815 const char *id
= IDENTIFIER_POINTER (DECL_NAME (decl
));
816 size_t ilen
= IDENTIFIER_LENGTH (DECL_NAME (decl
));
818 char *newname
= (char *) alloca (plen
+ ilen
+ 1);
820 memcpy (newname
, prefix
, plen
);
821 memcpy (newname
+ plen
, id
, ilen
+ 1);
823 return build_string (plen
+ ilen
, newname
);
831 static void handle_pragma_visibility (cpp_reader
*);
833 static VEC (int, heap
) *visstack
;
835 /* Push the visibility indicated by STR onto the top of the #pragma
836 visibility stack. KIND is 0 for #pragma GCC visibility, 1 for
837 C++ namespace with visibility attribute and 2 for C++ builtin
838 ABI namespace. push_visibility/pop_visibility calls must have
839 matching KIND, it is not allowed to push visibility using one
840 KIND and pop using a different one. */
843 push_visibility (const char *str
, int kind
)
845 VEC_safe_push (int, heap
, visstack
,
846 ((int) default_visibility
) | (kind
<< 8));
847 if (!strcmp (str
, "default"))
848 default_visibility
= VISIBILITY_DEFAULT
;
849 else if (!strcmp (str
, "internal"))
850 default_visibility
= VISIBILITY_INTERNAL
;
851 else if (!strcmp (str
, "hidden"))
852 default_visibility
= VISIBILITY_HIDDEN
;
853 else if (!strcmp (str
, "protected"))
854 default_visibility
= VISIBILITY_PROTECTED
;
856 GCC_BAD ("#pragma GCC visibility push() must specify default, internal, hidden or protected");
857 visibility_options
.inpragma
= 1;
860 /* Pop a level of the #pragma visibility stack. Return true if
864 pop_visibility (int kind
)
866 if (!VEC_length (int, visstack
))
868 if ((VEC_last (int, visstack
) >> 8) != kind
)
871 = (enum symbol_visibility
) (VEC_pop (int, visstack
) & 0xff);
872 visibility_options
.inpragma
873 = VEC_length (int, visstack
) != 0;
877 /* Sets the default visibility for symbols to something other than that
878 specified on the command line. */
881 handle_pragma_visibility (cpp_reader
*dummy ATTRIBUTE_UNUSED
)
883 /* Form is #pragma GCC visibility push(hidden)|pop */
885 enum cpp_ttype token
;
886 enum { bad
, push
, pop
} action
= bad
;
888 token
= pragma_lex (&x
);
889 if (token
== CPP_NAME
)
891 const char *op
= IDENTIFIER_POINTER (x
);
892 if (!strcmp (op
, "push"))
894 else if (!strcmp (op
, "pop"))
898 GCC_BAD ("#pragma GCC visibility must be followed by push or pop");
903 if (! pop_visibility (0))
904 GCC_BAD ("no matching push for %<#pragma GCC visibility pop%>");
908 if (pragma_lex (&x
) != CPP_OPEN_PAREN
)
909 GCC_BAD ("missing %<(%> after %<#pragma GCC visibility push%> - ignored");
910 token
= pragma_lex (&x
);
911 if (token
!= CPP_NAME
)
912 GCC_BAD ("malformed #pragma GCC visibility push");
914 push_visibility (IDENTIFIER_POINTER (x
), 0);
915 if (pragma_lex (&x
) != CPP_CLOSE_PAREN
)
916 GCC_BAD ("missing %<(%> after %<#pragma GCC visibility push%> - ignored");
919 if (pragma_lex (&x
) != CPP_EOF
)
920 warning (OPT_Wpragmas
, "junk at end of %<#pragma GCC visibility%>");
924 handle_pragma_diagnostic(cpp_reader
*ARG_UNUSED(dummy
))
926 const char *kind_string
, *option_string
;
927 unsigned int option_index
;
928 enum cpp_ttype token
;
931 struct cl_option_handlers handlers
;
933 token
= pragma_lex (&x
);
934 if (token
!= CPP_NAME
)
935 GCC_BAD ("missing [error|warning|ignored] after %<#pragma GCC diagnostic%>");
936 kind_string
= IDENTIFIER_POINTER (x
);
937 if (strcmp (kind_string
, "error") == 0)
939 else if (strcmp (kind_string
, "warning") == 0)
941 else if (strcmp (kind_string
, "ignored") == 0)
943 else if (strcmp (kind_string
, "push") == 0)
945 diagnostic_push_diagnostics (global_dc
, input_location
);
948 else if (strcmp (kind_string
, "pop") == 0)
950 diagnostic_pop_diagnostics (global_dc
, input_location
);
954 GCC_BAD ("expected [error|warning|ignored|push|pop] after %<#pragma GCC diagnostic%>");
956 token
= pragma_lex (&x
);
957 if (token
!= CPP_STRING
)
958 GCC_BAD ("missing option after %<#pragma GCC diagnostic%> kind");
959 option_string
= TREE_STRING_POINTER (x
);
960 set_default_handlers (&handlers
);
961 for (option_index
= 0; option_index
< cl_options_count
; option_index
++)
962 if (strcmp (cl_options
[option_index
].opt_text
, option_string
) == 0)
964 control_warning_option (option_index
, (int) kind
, kind
!= DK_IGNORED
,
965 input_location
, c_family_lang_mask
, &handlers
,
966 &global_options
, &global_options_set
,
970 GCC_BAD ("unknown option after %<#pragma GCC diagnostic%> kind");
973 /* Parse #pragma GCC target (xxx) to set target specific options. */
975 handle_pragma_target(cpp_reader
*ARG_UNUSED(dummy
))
977 enum cpp_ttype token
;
979 bool close_paren_needed_p
= false;
983 error ("#pragma GCC option is not allowed inside functions");
987 token
= pragma_lex (&x
);
988 if (token
== CPP_OPEN_PAREN
)
990 close_paren_needed_p
= true;
991 token
= pragma_lex (&x
);
994 if (token
!= CPP_STRING
)
996 GCC_BAD ("%<#pragma GCC option%> is not a string");
1000 /* Strings are user options. */
1003 tree args
= NULL_TREE
;
1007 /* Build up the strings now as a tree linked list. Skip empty
1009 if (TREE_STRING_LENGTH (x
) > 0)
1010 args
= tree_cons (NULL_TREE
, x
, args
);
1012 token
= pragma_lex (&x
);
1013 while (token
== CPP_COMMA
)
1014 token
= pragma_lex (&x
);
1016 while (token
== CPP_STRING
);
1018 if (close_paren_needed_p
)
1020 if (token
== CPP_CLOSE_PAREN
)
1021 token
= pragma_lex (&x
);
1023 GCC_BAD ("%<#pragma GCC target (string [,string]...)%> does "
1024 "not have a final %<)%>");
1027 if (token
!= CPP_EOF
)
1029 error ("#pragma GCC target string... is badly formed");
1033 /* put arguments in the order the user typed them. */
1034 args
= nreverse (args
);
1036 if (targetm
.target_option
.pragma_parse (args
, NULL_TREE
))
1037 current_target_pragma
= args
;
1041 /* Handle #pragma GCC optimize to set optimization options. */
1043 handle_pragma_optimize (cpp_reader
*ARG_UNUSED(dummy
))
1045 enum cpp_ttype token
;
1047 bool close_paren_needed_p
= false;
1048 tree optimization_previous_node
= optimization_current_node
;
1052 error ("#pragma GCC optimize is not allowed inside functions");
1056 token
= pragma_lex (&x
);
1057 if (token
== CPP_OPEN_PAREN
)
1059 close_paren_needed_p
= true;
1060 token
= pragma_lex (&x
);
1063 if (token
!= CPP_STRING
&& token
!= CPP_NUMBER
)
1065 GCC_BAD ("%<#pragma GCC optimize%> is not a string or number");
1069 /* Strings/numbers are user options. */
1072 tree args
= NULL_TREE
;
1076 /* Build up the numbers/strings now as a list. */
1077 if (token
!= CPP_STRING
|| TREE_STRING_LENGTH (x
) > 0)
1078 args
= tree_cons (NULL_TREE
, x
, args
);
1080 token
= pragma_lex (&x
);
1081 while (token
== CPP_COMMA
)
1082 token
= pragma_lex (&x
);
1084 while (token
== CPP_STRING
|| token
== CPP_NUMBER
);
1086 if (close_paren_needed_p
)
1088 if (token
== CPP_CLOSE_PAREN
)
1089 token
= pragma_lex (&x
);
1091 GCC_BAD ("%<#pragma GCC optimize (string [,string]...)%> does "
1092 "not have a final %<)%>");
1095 if (token
!= CPP_EOF
)
1097 error ("#pragma GCC optimize string... is badly formed");
1101 /* put arguments in the order the user typed them. */
1102 args
= nreverse (args
);
1104 parse_optimize_options (args
, false);
1105 current_optimize_pragma
= chainon (current_optimize_pragma
, args
);
1106 optimization_current_node
= build_optimization_node ();
1107 c_cpp_builtins_optimize_pragma (parse_in
,
1108 optimization_previous_node
,
1109 optimization_current_node
);
1113 /* Stack of the #pragma GCC options created with #pragma GCC push_option. Save
1114 both the binary representation of the options and the TREE_LIST of
1115 strings that will be added to the function's attribute list. */
1116 typedef struct GTY(()) opt_stack
{
1117 struct opt_stack
*prev
;
1119 tree target_strings
;
1120 tree optimize_binary
;
1121 tree optimize_strings
;
1124 static GTY(()) struct opt_stack
* options_stack
;
1126 /* Handle #pragma GCC push_options to save the current target and optimization
1130 handle_pragma_push_options (cpp_reader
*ARG_UNUSED(dummy
))
1132 enum cpp_ttype token
;
1136 token
= pragma_lex (&x
);
1137 if (token
!= CPP_EOF
)
1139 warning (OPT_Wpragmas
, "junk at end of %<#pragma push_options%>");
1143 p
= ggc_alloc_opt_stack ();
1144 p
->prev
= options_stack
;
1147 /* Save optimization and target flags in binary format. */
1148 p
->optimize_binary
= build_optimization_node ();
1149 p
->target_binary
= build_target_option_node ();
1151 /* Save optimization and target flags in string list format. */
1152 p
->optimize_strings
= copy_list (current_optimize_pragma
);
1153 p
->target_strings
= copy_list (current_target_pragma
);
1156 /* Handle #pragma GCC pop_options to restore the current target and
1157 optimization options from a previous push_options. */
1160 handle_pragma_pop_options (cpp_reader
*ARG_UNUSED(dummy
))
1162 enum cpp_ttype token
;
1166 token
= pragma_lex (&x
);
1167 if (token
!= CPP_EOF
)
1169 warning (OPT_Wpragmas
, "junk at end of %<#pragma pop_options%>");
1173 if (! options_stack
)
1175 warning (OPT_Wpragmas
,
1176 "%<#pragma GCC pop_options%> without a corresponding "
1177 "%<#pragma GCC push_options%>");
1182 options_stack
= p
->prev
;
1184 if (p
->target_binary
!= target_option_current_node
)
1186 (void) targetm
.target_option
.pragma_parse (NULL_TREE
, p
->target_binary
);
1187 target_option_current_node
= p
->target_binary
;
1190 if (p
->optimize_binary
!= optimization_current_node
)
1192 tree old_optimize
= optimization_current_node
;
1193 cl_optimization_restore (&global_options
,
1194 TREE_OPTIMIZATION (p
->optimize_binary
));
1195 c_cpp_builtins_optimize_pragma (parse_in
, old_optimize
,
1196 p
->optimize_binary
);
1197 optimization_current_node
= p
->optimize_binary
;
1200 current_target_pragma
= p
->target_strings
;
1201 current_optimize_pragma
= p
->optimize_strings
;
1204 /* Handle #pragma GCC reset_options to restore the current target and
1205 optimization options to the original options used on the command line. */
1208 handle_pragma_reset_options (cpp_reader
*ARG_UNUSED(dummy
))
1210 enum cpp_ttype token
;
1212 tree new_optimize
= optimization_default_node
;
1213 tree new_target
= target_option_default_node
;
1215 token
= pragma_lex (&x
);
1216 if (token
!= CPP_EOF
)
1218 warning (OPT_Wpragmas
, "junk at end of %<#pragma reset_options%>");
1222 if (new_target
!= target_option_current_node
)
1224 (void) targetm
.target_option
.pragma_parse (NULL_TREE
, new_target
);
1225 target_option_current_node
= new_target
;
1228 if (new_optimize
!= optimization_current_node
)
1230 tree old_optimize
= optimization_current_node
;
1231 cl_optimization_restore (&global_options
,
1232 TREE_OPTIMIZATION (new_optimize
));
1233 c_cpp_builtins_optimize_pragma (parse_in
, old_optimize
, new_optimize
);
1234 optimization_current_node
= new_optimize
;
1237 current_target_pragma
= NULL_TREE
;
1238 current_optimize_pragma
= NULL_TREE
;
1241 /* Print a plain user-specified message. */
1244 handle_pragma_message (cpp_reader
*ARG_UNUSED(dummy
))
1246 enum cpp_ttype token
;
1247 tree x
, message
= 0;
1249 token
= pragma_lex (&x
);
1250 if (token
== CPP_OPEN_PAREN
)
1252 token
= pragma_lex (&x
);
1253 if (token
== CPP_STRING
)
1256 GCC_BAD ("expected a string after %<#pragma message%>");
1257 if (pragma_lex (&x
) != CPP_CLOSE_PAREN
)
1258 GCC_BAD ("malformed %<#pragma message%>, ignored");
1260 else if (token
== CPP_STRING
)
1263 GCC_BAD ("expected a string after %<#pragma message%>");
1265 gcc_assert (message
);
1267 if (pragma_lex (&x
) != CPP_EOF
)
1268 warning (OPT_Wpragmas
, "junk at end of %<#pragma message%>");
1270 if (TREE_STRING_LENGTH (message
) > 1)
1271 inform (input_location
, "#pragma message: %s", TREE_STRING_POINTER (message
));
1274 /* Mark whether the current location is valid for a STDC pragma. */
1276 static bool valid_location_for_stdc_pragma
;
1279 mark_valid_location_for_stdc_pragma (bool flag
)
1281 valid_location_for_stdc_pragma
= flag
;
1284 /* Return true if the current location is valid for a STDC pragma. */
1287 valid_location_for_stdc_pragma_p (void)
1289 return valid_location_for_stdc_pragma
;
1292 enum pragma_switch_t
{ PRAGMA_ON
, PRAGMA_OFF
, PRAGMA_DEFAULT
, PRAGMA_BAD
};
1294 /* A STDC pragma must appear outside of external declarations or
1295 preceding all explicit declarations and statements inside a compound
1296 statement; its behavior is undefined if used in any other context.
1297 It takes a switch of ON, OFF, or DEFAULT. */
1299 static enum pragma_switch_t
1300 handle_stdc_pragma (const char *pname
)
1304 enum pragma_switch_t ret
;
1306 if (!valid_location_for_stdc_pragma_p ())
1308 warning (OPT_Wpragmas
, "invalid location for %<pragma %s%>, ignored",
1313 if (pragma_lex (&t
) != CPP_NAME
)
1315 warning (OPT_Wpragmas
, "malformed %<#pragma %s%>, ignored", pname
);
1319 arg
= IDENTIFIER_POINTER (t
);
1321 if (!strcmp (arg
, "ON"))
1323 else if (!strcmp (arg
, "OFF"))
1325 else if (!strcmp (arg
, "DEFAULT"))
1326 ret
= PRAGMA_DEFAULT
;
1329 warning (OPT_Wpragmas
, "malformed %<#pragma %s%>, ignored", pname
);
1333 if (pragma_lex (&t
) != CPP_EOF
)
1335 warning (OPT_Wpragmas
, "junk at end of %<#pragma %s%>", pname
);
1342 /* #pragma STDC FLOAT_CONST_DECIMAL64 ON
1343 #pragma STDC FLOAT_CONST_DECIMAL64 OFF
1344 #pragma STDC FLOAT_CONST_DECIMAL64 DEFAULT */
1347 handle_pragma_float_const_decimal64 (cpp_reader
*ARG_UNUSED (dummy
))
1349 if (c_dialect_cxx ())
1351 if (warn_unknown_pragmas
> in_system_header
)
1352 warning (OPT_Wunknown_pragmas
,
1353 "%<#pragma STDC FLOAT_CONST_DECIMAL64%> is not supported"
1358 if (!targetm
.decimal_float_supported_p ())
1360 if (warn_unknown_pragmas
> in_system_header
)
1361 warning (OPT_Wunknown_pragmas
,
1362 "%<#pragma STDC FLOAT_CONST_DECIMAL64%> is not supported"
1367 pedwarn (input_location
, OPT_pedantic
,
1368 "ISO C does not support %<#pragma STDC FLOAT_CONST_DECIMAL64%>");
1370 switch (handle_stdc_pragma ("STDC FLOAT_CONST_DECIMAL64"))
1373 set_float_const_decimal64 ();
1376 case PRAGMA_DEFAULT
:
1377 clear_float_const_decimal64 ();
1384 /* A vector of registered pragma callbacks, which is never freed. */
1385 DEF_VEC_O (internal_pragma_handler
);
1386 DEF_VEC_ALLOC_O (internal_pragma_handler
, heap
);
1388 static VEC(internal_pragma_handler
, heap
) *registered_pragmas
;
1396 DEF_VEC_O (pragma_ns_name
);
1397 DEF_VEC_ALLOC_O (pragma_ns_name
, heap
);
1399 static VEC(pragma_ns_name
, heap
) *registered_pp_pragmas
;
1401 struct omp_pragma_def
{ const char *name
; unsigned int id
; };
1402 static const struct omp_pragma_def omp_pragmas
[] = {
1403 { "atomic", PRAGMA_OMP_ATOMIC
},
1404 { "barrier", PRAGMA_OMP_BARRIER
},
1405 { "critical", PRAGMA_OMP_CRITICAL
},
1406 { "flush", PRAGMA_OMP_FLUSH
},
1407 { "for", PRAGMA_OMP_FOR
},
1408 { "master", PRAGMA_OMP_MASTER
},
1409 { "ordered", PRAGMA_OMP_ORDERED
},
1410 { "parallel", PRAGMA_OMP_PARALLEL
},
1411 { "section", PRAGMA_OMP_SECTION
},
1412 { "sections", PRAGMA_OMP_SECTIONS
},
1413 { "single", PRAGMA_OMP_SINGLE
},
1414 { "task", PRAGMA_OMP_TASK
},
1415 { "taskwait", PRAGMA_OMP_TASKWAIT
},
1416 { "taskyield", PRAGMA_OMP_TASKYIELD
},
1417 { "threadprivate", PRAGMA_OMP_THREADPRIVATE
}
1421 c_pp_lookup_pragma (unsigned int id
, const char **space
, const char **name
)
1423 const int n_omp_pragmas
= sizeof (omp_pragmas
) / sizeof (*omp_pragmas
);
1426 for (i
= 0; i
< n_omp_pragmas
; ++i
)
1427 if (omp_pragmas
[i
].id
== id
)
1430 *name
= omp_pragmas
[i
].name
;
1434 if (id
>= PRAGMA_FIRST_EXTERNAL
1435 && (id
< PRAGMA_FIRST_EXTERNAL
1436 + VEC_length (pragma_ns_name
, registered_pp_pragmas
)))
1438 *space
= VEC_index (pragma_ns_name
, registered_pp_pragmas
,
1439 id
- PRAGMA_FIRST_EXTERNAL
)->space
;
1440 *name
= VEC_index (pragma_ns_name
, registered_pp_pragmas
,
1441 id
- PRAGMA_FIRST_EXTERNAL
)->name
;
1448 /* Front-end wrappers for pragma registration to avoid dragging
1449 cpplib.h in almost everywhere. */
1452 c_register_pragma_1 (const char *space
, const char *name
,
1453 internal_pragma_handler ihandler
, bool allow_expansion
)
1457 if (flag_preprocess_only
)
1459 pragma_ns_name ns_name
;
1461 if (!allow_expansion
)
1464 ns_name
.space
= space
;
1465 ns_name
.name
= name
;
1466 VEC_safe_push (pragma_ns_name
, heap
, registered_pp_pragmas
, &ns_name
);
1467 id
= VEC_length (pragma_ns_name
, registered_pp_pragmas
);
1468 id
+= PRAGMA_FIRST_EXTERNAL
- 1;
1472 VEC_safe_push (internal_pragma_handler
, heap
, registered_pragmas
,
1474 id
= VEC_length (internal_pragma_handler
, registered_pragmas
);
1475 id
+= PRAGMA_FIRST_EXTERNAL
- 1;
1477 /* The C++ front end allocates 6 bits in cp_token; the C front end
1478 allocates 7 bits in c_token. At present this is sufficient. */
1479 gcc_assert (id
< 64);
1482 cpp_register_deferred_pragma (parse_in
, space
, name
, id
,
1483 allow_expansion
, false);
1486 /* Register a C pragma handler, using a space and a name. It disallows pragma
1487 expansion (if you want it, use c_register_pragma_with_expansion instead). */
1489 c_register_pragma (const char *space
, const char *name
,
1490 pragma_handler_1arg handler
)
1492 internal_pragma_handler ihandler
;
1494 ihandler
.handler
.handler_1arg
= handler
;
1495 ihandler
.extra_data
= false;
1496 ihandler
.data
= NULL
;
1497 c_register_pragma_1 (space
, name
, ihandler
, false);
1500 /* Register a C pragma handler, using a space and a name, it also carries an
1501 extra data field which can be used by the handler. It disallows pragma
1502 expansion (if you want it, use c_register_pragma_with_expansion_and_data
1505 c_register_pragma_with_data (const char *space
, const char *name
,
1506 pragma_handler_2arg handler
, void * data
)
1508 internal_pragma_handler ihandler
;
1510 ihandler
.handler
.handler_2arg
= handler
;
1511 ihandler
.extra_data
= true;
1512 ihandler
.data
= data
;
1513 c_register_pragma_1 (space
, name
, ihandler
, false);
1516 /* Register a C pragma handler, using a space and a name. It allows pragma
1517 expansion as in the following example:
1520 #pragma count (NUMBER)
1522 Name expansion is still disallowed. */
1524 c_register_pragma_with_expansion (const char *space
, const char *name
,
1525 pragma_handler_1arg handler
)
1527 internal_pragma_handler ihandler
;
1529 ihandler
.handler
.handler_1arg
= handler
;
1530 ihandler
.extra_data
= false;
1531 ihandler
.data
= NULL
;
1532 c_register_pragma_1 (space
, name
, ihandler
, true);
1535 /* Register a C pragma handler, using a space and a name, it also carries an
1536 extra data field which can be used by the handler. It allows pragma
1537 expansion as in the following example:
1540 #pragma count (NUMBER)
1542 Name expansion is still disallowed. */
1544 c_register_pragma_with_expansion_and_data (const char *space
, const char *name
,
1545 pragma_handler_2arg handler
,
1548 internal_pragma_handler ihandler
;
1550 ihandler
.handler
.handler_2arg
= handler
;
1551 ihandler
.extra_data
= true;
1552 ihandler
.data
= data
;
1553 c_register_pragma_1 (space
, name
, ihandler
, true);
1557 c_invoke_pragma_handler (unsigned int id
)
1559 internal_pragma_handler
*ihandler
;
1560 pragma_handler_1arg handler_1arg
;
1561 pragma_handler_2arg handler_2arg
;
1563 id
-= PRAGMA_FIRST_EXTERNAL
;
1564 ihandler
= VEC_index (internal_pragma_handler
, registered_pragmas
, id
);
1565 if (ihandler
->extra_data
)
1567 handler_2arg
= ihandler
->handler
.handler_2arg
;
1568 handler_2arg (parse_in
, ihandler
->data
);
1572 handler_1arg
= ihandler
->handler
.handler_1arg
;
1573 handler_1arg (parse_in
);
1577 /* Set up front-end pragmas. */
1583 const int n_omp_pragmas
= sizeof (omp_pragmas
) / sizeof (*omp_pragmas
);
1586 for (i
= 0; i
< n_omp_pragmas
; ++i
)
1587 cpp_register_deferred_pragma (parse_in
, "omp", omp_pragmas
[i
].name
,
1588 omp_pragmas
[i
].id
, true, true);
1591 if (!flag_preprocess_only
)
1592 cpp_register_deferred_pragma (parse_in
, "GCC", "pch_preprocess",
1593 PRAGMA_GCC_PCH_PREPROCESS
, false, false);
1595 #ifdef HANDLE_PRAGMA_PACK_WITH_EXPANSION
1596 c_register_pragma_with_expansion (0, "pack", handle_pragma_pack
);
1598 c_register_pragma (0, "pack", handle_pragma_pack
);
1600 c_register_pragma (0, "weak", handle_pragma_weak
);
1601 c_register_pragma ("GCC", "visibility", handle_pragma_visibility
);
1603 c_register_pragma ("GCC", "diagnostic", handle_pragma_diagnostic
);
1604 c_register_pragma ("GCC", "target", handle_pragma_target
);
1605 c_register_pragma ("GCC", "optimize", handle_pragma_optimize
);
1606 c_register_pragma ("GCC", "push_options", handle_pragma_push_options
);
1607 c_register_pragma ("GCC", "pop_options", handle_pragma_pop_options
);
1608 c_register_pragma ("GCC", "reset_options", handle_pragma_reset_options
);
1610 c_register_pragma ("STDC", "FLOAT_CONST_DECIMAL64",
1611 handle_pragma_float_const_decimal64
);
1613 c_register_pragma_with_expansion (0, "redefine_extname",
1614 handle_pragma_redefine_extname
);
1616 c_register_pragma_with_expansion (0, "message", handle_pragma_message
);
1620 c_register_pragma (0, "upc", handle_pragma_upc
);
1622 c_register_pragma (0, "pupc", handle_pragma_pupc
);
1623 init_pragma_pupc ();
1626 #ifdef REGISTER_TARGET_PRAGMAS
1627 REGISTER_TARGET_PRAGMAS ();
1630 /* Allow plugins to register their own pragmas. */
1631 invoke_plugin_callbacks (PLUGIN_PRAGMAS
, NULL
);
1634 #include "gt-c-family-c-pragma.h"