1 /* Handle #pragma, system V.4 style. Supports #pragma weak and #pragma pack.
2 Copyright (C) 1992-2013 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
22 #include "coretypes.h"
25 #include "function.h" /* For cfun. FIXME: Does the parser know
26 when it is inside a function, so that
27 we don't have to look at cfun? */
32 #include "tm_p.h" /* For REGISTER_TARGET_PRAGMAS (why is
33 this not a target hook?). */
36 #include "diagnostic.h"
41 #define GCC_BAD(gmsgid) \
42 do { warning (OPT_Wpragmas, gmsgid); return; } while (0)
43 #define GCC_BAD2(gmsgid, arg) \
44 do { warning (OPT_Wpragmas, gmsgid, arg); return; } while (0)
46 typedef struct GTY(()) align_stack
{
49 struct align_stack
* prev
;
52 static GTY(()) struct align_stack
* alignment_stack
;
54 static void handle_pragma_pack (cpp_reader
*);
56 /* If we have a "global" #pragma pack(<n>) in effect when the first
57 #pragma pack(push,<n>) is encountered, this stores the value of
58 maximum_field_alignment in effect. When the final pop_alignment()
59 happens, we restore the value to this, not to a value of 0 for
60 maximum_field_alignment. Value is in bits. */
61 static int default_alignment
;
62 #define SET_GLOBAL_ALIGNMENT(ALIGN) (maximum_field_alignment = *(alignment_stack == NULL \
63 ? &default_alignment \
64 : &alignment_stack->alignment) = (ALIGN))
66 static void push_alignment (int, tree
);
67 static void pop_alignment (tree
);
69 /* Push an alignment value onto the stack. */
71 push_alignment (int alignment
, tree id
)
75 entry
= ggc_alloc_align_stack ();
77 entry
->alignment
= alignment
;
79 entry
->prev
= alignment_stack
;
81 /* The current value of maximum_field_alignment is not necessarily
82 0 since there may be a #pragma pack(<n>) in effect; remember it
83 so that we can restore it after the final #pragma pop(). */
84 if (alignment_stack
== NULL
)
85 default_alignment
= maximum_field_alignment
;
87 alignment_stack
= entry
;
89 maximum_field_alignment
= alignment
;
92 /* Undo a push of an alignment onto the stack. */
94 pop_alignment (tree id
)
98 if (alignment_stack
== NULL
)
99 GCC_BAD ("#pragma pack (pop) encountered without matching #pragma pack (push)");
101 /* If we got an identifier, strip away everything above the target
102 entry so that the next step will restore the state just below it. */
105 for (entry
= alignment_stack
; entry
; entry
= entry
->prev
)
108 alignment_stack
= entry
;
112 warning (OPT_Wpragmas
, "\
113 #pragma pack(pop, %E) encountered without matching #pragma pack(push, %E)"
117 entry
= alignment_stack
->prev
;
119 maximum_field_alignment
= entry
? entry
->alignment
: default_alignment
;
121 alignment_stack
= entry
;
128 #pragma pack (push, N)
129 #pragma pack (push, ID)
130 #pragma pack (push, ID, N)
132 #pragma pack (pop, ID) */
134 handle_pragma_pack (cpp_reader
* ARG_UNUSED (dummy
))
138 enum cpp_ttype token
;
139 enum { set
, push
, pop
} action
;
141 if (pragma_lex (&x
) != CPP_OPEN_PAREN
)
142 GCC_BAD ("missing %<(%> after %<#pragma pack%> - ignored");
144 token
= pragma_lex (&x
);
145 if (token
== CPP_CLOSE_PAREN
)
148 align
= initial_max_fld_align
;
150 else if (token
== CPP_NUMBER
)
152 if (TREE_CODE (x
) != INTEGER_CST
)
153 GCC_BAD ("invalid constant in %<#pragma pack%> - ignored");
154 align
= TREE_INT_CST_LOW (x
);
156 if (pragma_lex (&x
) != CPP_CLOSE_PAREN
)
157 GCC_BAD ("malformed %<#pragma pack%> - ignored");
159 else if (token
== CPP_NAME
)
161 #define GCC_BAD_ACTION do { if (action != pop) \
162 GCC_BAD ("malformed %<#pragma pack(push[, id][, <n>])%> - ignored"); \
164 GCC_BAD ("malformed %<#pragma pack(pop[, id])%> - ignored"); \
167 const char *op
= IDENTIFIER_POINTER (x
);
168 if (!strcmp (op
, "push"))
170 else if (!strcmp (op
, "pop"))
173 GCC_BAD2 ("unknown action %qE for %<#pragma pack%> - ignored", x
);
175 while ((token
= pragma_lex (&x
)) == CPP_COMMA
)
177 token
= pragma_lex (&x
);
178 if (token
== CPP_NAME
&& id
== 0)
182 else if (token
== CPP_NUMBER
&& action
== push
&& align
== -1)
184 if (TREE_CODE (x
) != INTEGER_CST
)
185 GCC_BAD ("invalid constant in %<#pragma pack%> - ignored");
186 align
= TREE_INT_CST_LOW (x
);
194 if (token
!= CPP_CLOSE_PAREN
)
196 #undef GCC_BAD_ACTION
199 GCC_BAD ("malformed %<#pragma pack%> - ignored");
201 if (pragma_lex (&x
) != CPP_EOF
)
202 warning (OPT_Wpragmas
, "junk at end of %<#pragma pack%>");
204 if (flag_pack_struct
)
205 GCC_BAD ("#pragma pack has no effect with -fpack-struct - ignored");
216 align
*= BITS_PER_UNIT
;
221 align
= maximum_field_alignment
;
225 GCC_BAD2 ("alignment must be a small power of two, not %d", align
);
230 case set
: SET_GLOBAL_ALIGNMENT (align
); break;
231 case push
: push_alignment (align
, id
); break;
232 case pop
: pop_alignment (id
); break;
236 typedef struct GTY(()) pending_weak_d
243 static GTY(()) vec
<pending_weak
, va_gc
> *pending_weaks
;
245 static void apply_pragma_weak (tree
, tree
);
246 static void handle_pragma_weak (cpp_reader
*);
249 apply_pragma_weak (tree decl
, tree value
)
253 value
= build_string (IDENTIFIER_LENGTH (value
),
254 IDENTIFIER_POINTER (value
));
255 decl_attributes (&decl
, build_tree_list (get_identifier ("alias"),
256 build_tree_list (NULL
, value
)),
260 if (SUPPORTS_WEAK
&& DECL_EXTERNAL (decl
) && TREE_USED (decl
)
261 && !DECL_WEAK (decl
) /* Don't complain about a redundant #pragma. */
262 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
)))
263 warning (OPT_Wpragmas
, "applying #pragma weak %q+D after first use "
264 "results in unspecified behavior", decl
);
270 maybe_apply_pragma_weak (tree decl
)
276 /* Avoid asking for DECL_ASSEMBLER_NAME when it's not needed. */
278 /* No weak symbols pending, take the short-cut. */
281 /* If it's not visible outside this file, it doesn't matter whether
283 if (!DECL_EXTERNAL (decl
) && !TREE_PUBLIC (decl
))
285 /* If it's not a function or a variable, it can't be weak.
286 FIXME: what kinds of things are visible outside this file but
287 aren't functions or variables? Should this be an assert instead? */
288 if (TREE_CODE (decl
) != FUNCTION_DECL
&& TREE_CODE (decl
) != VAR_DECL
)
291 id
= DECL_ASSEMBLER_NAME (decl
);
293 FOR_EACH_VEC_ELT (*pending_weaks
, i
, pe
)
296 apply_pragma_weak (decl
, pe
->value
);
297 pending_weaks
->unordered_remove (i
);
302 /* Process all "#pragma weak A = B" directives where we have not seen
305 maybe_apply_pending_pragma_weaks (void)
307 tree alias_id
, id
, decl
;
315 FOR_EACH_VEC_ELT (*pending_weaks
, i
, pe
)
323 target
= symtab_node_for_asm (id
);
324 decl
= build_decl (UNKNOWN_LOCATION
,
325 target
? TREE_CODE (target
->symbol
.decl
) : FUNCTION_DECL
,
326 alias_id
, default_function_type
);
328 DECL_ARTIFICIAL (decl
) = 1;
329 TREE_PUBLIC (decl
) = 1;
330 DECL_WEAK (decl
) = 1;
331 if (TREE_CODE (decl
) == VAR_DECL
)
332 TREE_STATIC (decl
) = 1;
335 error ("%q+D aliased to undefined symbol %qE",
340 assemble_alias (decl
, id
);
344 /* #pragma weak name [= value] */
346 handle_pragma_weak (cpp_reader
* ARG_UNUSED (dummy
))
348 tree name
, value
, x
, decl
;
353 if (pragma_lex (&name
) != CPP_NAME
)
354 GCC_BAD ("malformed #pragma weak, ignored");
358 if (pragma_lex (&value
) != CPP_NAME
)
359 GCC_BAD ("malformed #pragma weak, ignored");
363 warning (OPT_Wpragmas
, "junk at end of %<#pragma weak%>");
365 decl
= identifier_global_value (name
);
366 if (decl
&& DECL_P (decl
))
368 apply_pragma_weak (decl
, value
);
370 assemble_alias (decl
, value
);
374 pending_weak pe
= {name
, value
};
375 vec_safe_push (pending_weaks
, pe
);
379 /* GCC supports two #pragma directives for renaming the external
380 symbol associated with a declaration (DECL_ASSEMBLER_NAME), for
381 compatibility with the Solaris and VMS system headers. GCC also
382 has its own notation for this, __asm__("name") annotations.
384 Corner cases of these features and their interaction:
386 1) Both pragmas silently apply only to declarations with external
387 linkage (that is, TREE_PUBLIC || DECL_EXTERNAL). Asm labels
388 do not have this restriction.
390 2) In C++, both #pragmas silently apply only to extern "C" declarations.
391 Asm labels do not have this restriction.
393 3) If any of the three ways of changing DECL_ASSEMBLER_NAME is
394 applied to a decl whose DECL_ASSEMBLER_NAME is already set, and the
395 new name is different, a warning issues and the name does not change.
397 4) The "source name" for #pragma redefine_extname is the DECL_NAME,
398 *not* the DECL_ASSEMBLER_NAME.
400 5) If #pragma extern_prefix is in effect and a declaration occurs
401 with an __asm__ name, the #pragma extern_prefix is silently
402 ignored for that declaration.
404 6) If #pragma extern_prefix and #pragma redefine_extname apply to
405 the same declaration, whichever triggered first wins, and a warning
406 is issued. (We would like to have #pragma redefine_extname always
407 win, but it can appear either before or after the declaration, and
408 if it appears afterward, we have no way of knowing whether a modified
409 DECL_ASSEMBLER_NAME is due to #pragma extern_prefix.) */
411 typedef struct GTY(()) pending_redefinition_d
{
414 } pending_redefinition
;
417 static GTY(()) vec
<pending_redefinition
, va_gc
> *pending_redefine_extname
;
419 static void handle_pragma_redefine_extname (cpp_reader
*);
421 /* #pragma redefine_extname oldname newname */
423 handle_pragma_redefine_extname (cpp_reader
* ARG_UNUSED (dummy
))
425 tree oldname
, newname
, decls
, x
;
429 if (pragma_lex (&oldname
) != CPP_NAME
)
430 GCC_BAD ("malformed #pragma redefine_extname, ignored");
431 if (pragma_lex (&newname
) != CPP_NAME
)
432 GCC_BAD ("malformed #pragma redefine_extname, ignored");
435 warning (OPT_Wpragmas
, "junk at end of %<#pragma redefine_extname%>");
438 for (decls
= c_linkage_bindings (oldname
);
442 if (TREE_CODE (decls
) == TREE_LIST
)
444 decl
= TREE_VALUE (decls
);
445 decls
= TREE_CHAIN (decls
);
453 if ((TREE_PUBLIC (decl
) || DECL_EXTERNAL (decl
))
454 && (TREE_CODE (decl
) == FUNCTION_DECL
455 || TREE_CODE (decl
) == VAR_DECL
))
458 if (DECL_ASSEMBLER_NAME_SET_P (decl
))
460 const char *name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
461 name
= targetm
.strip_name_encoding (name
);
463 if (strcmp (name
, IDENTIFIER_POINTER (newname
)))
464 warning (OPT_Wpragmas
, "#pragma redefine_extname ignored due to "
465 "conflict with previous rename");
468 change_decl_assembler_name (decl
, newname
);
473 /* We have to add this to the rename list even if there's already
474 a global value that doesn't meet the above criteria, because in
475 C++ "struct foo {...};" puts "foo" in the current namespace but
476 does *not* conflict with a subsequent declaration of a function
477 or variable foo. See g++.dg/other/pragma-re-2.C. */
478 add_to_renaming_pragma_list (oldname
, newname
);
481 /* This is called from here and from ia64.c. */
483 add_to_renaming_pragma_list (tree oldname
, tree newname
)
486 pending_redefinition
*p
;
488 FOR_EACH_VEC_SAFE_ELT (pending_redefine_extname
, ix
, p
)
489 if (oldname
== p
->oldname
)
491 if (p
->newname
!= newname
)
492 warning (OPT_Wpragmas
, "#pragma redefine_extname ignored due to "
493 "conflict with previous #pragma redefine_extname");
497 pending_redefinition e
= {oldname
, newname
};
498 vec_safe_push (pending_redefine_extname
, e
);
501 /* The current prefix set by #pragma extern_prefix. */
502 GTY(()) tree pragma_extern_prefix
;
504 /* Hook from the front ends to apply the results of one of the preceding
505 pragmas that rename variables. */
508 maybe_apply_renaming_pragma (tree decl
, tree asmname
)
511 pending_redefinition
*p
;
513 /* The renaming pragmas are only applied to declarations with
515 if ((TREE_CODE (decl
) != FUNCTION_DECL
&& TREE_CODE (decl
) != VAR_DECL
)
516 || (!TREE_PUBLIC (decl
) && !DECL_EXTERNAL (decl
))
517 || !has_c_linkage (decl
))
520 /* If the DECL_ASSEMBLER_NAME is already set, it does not change,
521 but we may warn about a rename that conflicts. */
522 if (DECL_ASSEMBLER_NAME_SET_P (decl
))
524 const char *oldname
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
525 oldname
= targetm
.strip_name_encoding (oldname
);
527 if (asmname
&& strcmp (TREE_STRING_POINTER (asmname
), oldname
))
528 warning (OPT_Wpragmas
, "asm declaration ignored due to "
529 "conflict with previous rename");
531 /* Take any pending redefine_extname off the list. */
532 FOR_EACH_VEC_SAFE_ELT (pending_redefine_extname
, ix
, p
)
533 if (DECL_NAME (decl
) == p
->oldname
)
535 /* Only warn if there is a conflict. */
536 if (strcmp (IDENTIFIER_POINTER (p
->newname
), oldname
))
537 warning (OPT_Wpragmas
, "#pragma redefine_extname ignored due to "
538 "conflict with previous rename");
540 pending_redefine_extname
->unordered_remove (ix
);
546 /* Find out if we have a pending #pragma redefine_extname. */
547 FOR_EACH_VEC_SAFE_ELT (pending_redefine_extname
, ix
, p
)
548 if (DECL_NAME (decl
) == p
->oldname
)
550 tree newname
= p
->newname
;
551 pending_redefine_extname
->unordered_remove (ix
);
553 /* If we already have an asmname, #pragma redefine_extname is
554 ignored (with a warning if it conflicts). */
557 if (strcmp (TREE_STRING_POINTER (asmname
),
558 IDENTIFIER_POINTER (newname
)) != 0)
559 warning (OPT_Wpragmas
, "#pragma redefine_extname ignored due to "
560 "conflict with __asm__ declaration");
564 /* Otherwise we use what we've got; #pragma extern_prefix is
566 return build_string (IDENTIFIER_LENGTH (newname
),
567 IDENTIFIER_POINTER (newname
));
570 /* If we've got an asmname, #pragma extern_prefix is silently ignored. */
574 /* If #pragma extern_prefix is in effect, apply it. */
575 if (pragma_extern_prefix
)
577 const char *prefix
= TREE_STRING_POINTER (pragma_extern_prefix
);
578 size_t plen
= TREE_STRING_LENGTH (pragma_extern_prefix
) - 1;
580 const char *id
= IDENTIFIER_POINTER (DECL_NAME (decl
));
581 size_t ilen
= IDENTIFIER_LENGTH (DECL_NAME (decl
));
583 char *newname
= (char *) alloca (plen
+ ilen
+ 1);
585 memcpy (newname
, prefix
, plen
);
586 memcpy (newname
+ plen
, id
, ilen
+ 1);
588 return build_string (plen
+ ilen
, newname
);
596 static void handle_pragma_visibility (cpp_reader
*);
598 static vec
<int> visstack
;
600 /* Push the visibility indicated by STR onto the top of the #pragma
601 visibility stack. KIND is 0 for #pragma GCC visibility, 1 for
602 C++ namespace with visibility attribute and 2 for C++ builtin
603 ABI namespace. push_visibility/pop_visibility calls must have
604 matching KIND, it is not allowed to push visibility using one
605 KIND and pop using a different one. */
608 push_visibility (const char *str
, int kind
)
610 visstack
.safe_push (((int) default_visibility
) | (kind
<< 8));
611 if (!strcmp (str
, "default"))
612 default_visibility
= VISIBILITY_DEFAULT
;
613 else if (!strcmp (str
, "internal"))
614 default_visibility
= VISIBILITY_INTERNAL
;
615 else if (!strcmp (str
, "hidden"))
616 default_visibility
= VISIBILITY_HIDDEN
;
617 else if (!strcmp (str
, "protected"))
618 default_visibility
= VISIBILITY_PROTECTED
;
620 GCC_BAD ("#pragma GCC visibility push() must specify default, internal, hidden or protected");
621 visibility_options
.inpragma
= 1;
624 /* Pop a level of the #pragma visibility stack. Return true if
628 pop_visibility (int kind
)
630 if (!visstack
.length ())
632 if ((visstack
.last () >> 8) != kind
)
635 = (enum symbol_visibility
) (visstack
.pop () & 0xff);
636 visibility_options
.inpragma
637 = visstack
.length () != 0;
641 /* Sets the default visibility for symbols to something other than that
642 specified on the command line. */
645 handle_pragma_visibility (cpp_reader
*dummy ATTRIBUTE_UNUSED
)
647 /* Form is #pragma GCC visibility push(hidden)|pop */
649 enum cpp_ttype token
;
650 enum { bad
, push
, pop
} action
= bad
;
652 token
= pragma_lex (&x
);
653 if (token
== CPP_NAME
)
655 const char *op
= IDENTIFIER_POINTER (x
);
656 if (!strcmp (op
, "push"))
658 else if (!strcmp (op
, "pop"))
662 GCC_BAD ("#pragma GCC visibility must be followed by push or pop");
667 if (! pop_visibility (0))
668 GCC_BAD ("no matching push for %<#pragma GCC visibility pop%>");
672 if (pragma_lex (&x
) != CPP_OPEN_PAREN
)
673 GCC_BAD ("missing %<(%> after %<#pragma GCC visibility push%> - ignored");
674 token
= pragma_lex (&x
);
675 if (token
!= CPP_NAME
)
676 GCC_BAD ("malformed #pragma GCC visibility push");
678 push_visibility (IDENTIFIER_POINTER (x
), 0);
679 if (pragma_lex (&x
) != CPP_CLOSE_PAREN
)
680 GCC_BAD ("missing %<(%> after %<#pragma GCC visibility push%> - ignored");
683 if (pragma_lex (&x
) != CPP_EOF
)
684 warning (OPT_Wpragmas
, "junk at end of %<#pragma GCC visibility%>");
688 handle_pragma_diagnostic(cpp_reader
*ARG_UNUSED(dummy
))
690 const char *kind_string
, *option_string
;
691 unsigned int option_index
;
692 enum cpp_ttype token
;
695 struct cl_option_handlers handlers
;
697 token
= pragma_lex (&x
);
698 if (token
!= CPP_NAME
)
699 GCC_BAD ("missing [error|warning|ignored] after %<#pragma GCC diagnostic%>");
700 kind_string
= IDENTIFIER_POINTER (x
);
701 if (strcmp (kind_string
, "error") == 0)
703 else if (strcmp (kind_string
, "warning") == 0)
705 else if (strcmp (kind_string
, "ignored") == 0)
707 else if (strcmp (kind_string
, "push") == 0)
709 diagnostic_push_diagnostics (global_dc
, input_location
);
712 else if (strcmp (kind_string
, "pop") == 0)
714 diagnostic_pop_diagnostics (global_dc
, input_location
);
718 GCC_BAD ("expected [error|warning|ignored|push|pop] after %<#pragma GCC diagnostic%>");
720 token
= pragma_lex (&x
);
721 if (token
!= CPP_STRING
)
722 GCC_BAD ("missing option after %<#pragma GCC diagnostic%> kind");
723 option_string
= TREE_STRING_POINTER (x
);
724 set_default_handlers (&handlers
);
725 for (option_index
= 0; option_index
< cl_options_count
; option_index
++)
726 if (strcmp (cl_options
[option_index
].opt_text
, option_string
) == 0)
728 control_warning_option (option_index
, (int) kind
, kind
!= DK_IGNORED
,
729 input_location
, c_family_lang_mask
, &handlers
,
730 &global_options
, &global_options_set
,
734 GCC_BAD ("unknown option after %<#pragma GCC diagnostic%> kind");
737 /* Parse #pragma GCC target (xxx) to set target specific options. */
739 handle_pragma_target(cpp_reader
*ARG_UNUSED(dummy
))
741 enum cpp_ttype token
;
743 bool close_paren_needed_p
= false;
747 error ("#pragma GCC option is not allowed inside functions");
751 token
= pragma_lex (&x
);
752 if (token
== CPP_OPEN_PAREN
)
754 close_paren_needed_p
= true;
755 token
= pragma_lex (&x
);
758 if (token
!= CPP_STRING
)
760 GCC_BAD ("%<#pragma GCC option%> is not a string");
764 /* Strings are user options. */
767 tree args
= NULL_TREE
;
771 /* Build up the strings now as a tree linked list. Skip empty
773 if (TREE_STRING_LENGTH (x
) > 0)
774 args
= tree_cons (NULL_TREE
, x
, args
);
776 token
= pragma_lex (&x
);
777 while (token
== CPP_COMMA
)
778 token
= pragma_lex (&x
);
780 while (token
== CPP_STRING
);
782 if (close_paren_needed_p
)
784 if (token
== CPP_CLOSE_PAREN
)
785 token
= pragma_lex (&x
);
787 GCC_BAD ("%<#pragma GCC target (string [,string]...)%> does "
788 "not have a final %<)%>");
791 if (token
!= CPP_EOF
)
793 error ("#pragma GCC target string... is badly formed");
797 /* put arguments in the order the user typed them. */
798 args
= nreverse (args
);
800 if (targetm
.target_option
.pragma_parse (args
, NULL_TREE
))
801 current_target_pragma
= args
;
805 /* Handle #pragma GCC optimize to set optimization options. */
807 handle_pragma_optimize (cpp_reader
*ARG_UNUSED(dummy
))
809 enum cpp_ttype token
;
811 bool close_paren_needed_p
= false;
812 tree optimization_previous_node
= optimization_current_node
;
816 error ("#pragma GCC optimize is not allowed inside functions");
820 token
= pragma_lex (&x
);
821 if (token
== CPP_OPEN_PAREN
)
823 close_paren_needed_p
= true;
824 token
= pragma_lex (&x
);
827 if (token
!= CPP_STRING
&& token
!= CPP_NUMBER
)
829 GCC_BAD ("%<#pragma GCC optimize%> is not a string or number");
833 /* Strings/numbers are user options. */
836 tree args
= NULL_TREE
;
840 /* Build up the numbers/strings now as a list. */
841 if (token
!= CPP_STRING
|| TREE_STRING_LENGTH (x
) > 0)
842 args
= tree_cons (NULL_TREE
, x
, args
);
844 token
= pragma_lex (&x
);
845 while (token
== CPP_COMMA
)
846 token
= pragma_lex (&x
);
848 while (token
== CPP_STRING
|| token
== CPP_NUMBER
);
850 if (close_paren_needed_p
)
852 if (token
== CPP_CLOSE_PAREN
)
853 token
= pragma_lex (&x
);
855 GCC_BAD ("%<#pragma GCC optimize (string [,string]...)%> does "
856 "not have a final %<)%>");
859 if (token
!= CPP_EOF
)
861 error ("#pragma GCC optimize string... is badly formed");
865 /* put arguments in the order the user typed them. */
866 args
= nreverse (args
);
868 parse_optimize_options (args
, false);
869 current_optimize_pragma
= chainon (current_optimize_pragma
, args
);
870 optimization_current_node
= build_optimization_node ();
871 c_cpp_builtins_optimize_pragma (parse_in
,
872 optimization_previous_node
,
873 optimization_current_node
);
877 /* Stack of the #pragma GCC options created with #pragma GCC push_option. Save
878 both the binary representation of the options and the TREE_LIST of
879 strings that will be added to the function's attribute list. */
880 typedef struct GTY(()) opt_stack
{
881 struct opt_stack
*prev
;
884 tree optimize_binary
;
885 tree optimize_strings
;
888 static GTY(()) struct opt_stack
* options_stack
;
890 /* Handle #pragma GCC push_options to save the current target and optimization
894 handle_pragma_push_options (cpp_reader
*ARG_UNUSED(dummy
))
896 enum cpp_ttype token
;
900 token
= pragma_lex (&x
);
901 if (token
!= CPP_EOF
)
903 warning (OPT_Wpragmas
, "junk at end of %<#pragma push_options%>");
907 p
= ggc_alloc_opt_stack ();
908 p
->prev
= options_stack
;
911 /* Save optimization and target flags in binary format. */
912 p
->optimize_binary
= build_optimization_node ();
913 p
->target_binary
= build_target_option_node ();
915 /* Save optimization and target flags in string list format. */
916 p
->optimize_strings
= copy_list (current_optimize_pragma
);
917 p
->target_strings
= copy_list (current_target_pragma
);
920 /* Handle #pragma GCC pop_options to restore the current target and
921 optimization options from a previous push_options. */
924 handle_pragma_pop_options (cpp_reader
*ARG_UNUSED(dummy
))
926 enum cpp_ttype token
;
930 token
= pragma_lex (&x
);
931 if (token
!= CPP_EOF
)
933 warning (OPT_Wpragmas
, "junk at end of %<#pragma pop_options%>");
939 warning (OPT_Wpragmas
,
940 "%<#pragma GCC pop_options%> without a corresponding "
941 "%<#pragma GCC push_options%>");
946 options_stack
= p
->prev
;
948 if (p
->target_binary
!= target_option_current_node
)
950 (void) targetm
.target_option
.pragma_parse (NULL_TREE
, p
->target_binary
);
951 target_option_current_node
= p
->target_binary
;
954 if (p
->optimize_binary
!= optimization_current_node
)
956 tree old_optimize
= optimization_current_node
;
957 cl_optimization_restore (&global_options
,
958 TREE_OPTIMIZATION (p
->optimize_binary
));
959 c_cpp_builtins_optimize_pragma (parse_in
, old_optimize
,
961 optimization_current_node
= p
->optimize_binary
;
964 current_target_pragma
= p
->target_strings
;
965 current_optimize_pragma
= p
->optimize_strings
;
968 /* Handle #pragma GCC reset_options to restore the current target and
969 optimization options to the original options used on the command line. */
972 handle_pragma_reset_options (cpp_reader
*ARG_UNUSED(dummy
))
974 enum cpp_ttype token
;
976 tree new_optimize
= optimization_default_node
;
977 tree new_target
= target_option_default_node
;
979 token
= pragma_lex (&x
);
980 if (token
!= CPP_EOF
)
982 warning (OPT_Wpragmas
, "junk at end of %<#pragma reset_options%>");
986 if (new_target
!= target_option_current_node
)
988 (void) targetm
.target_option
.pragma_parse (NULL_TREE
, new_target
);
989 target_option_current_node
= new_target
;
992 if (new_optimize
!= optimization_current_node
)
994 tree old_optimize
= optimization_current_node
;
995 cl_optimization_restore (&global_options
,
996 TREE_OPTIMIZATION (new_optimize
));
997 c_cpp_builtins_optimize_pragma (parse_in
, old_optimize
, new_optimize
);
998 optimization_current_node
= new_optimize
;
1001 current_target_pragma
= NULL_TREE
;
1002 current_optimize_pragma
= NULL_TREE
;
1005 /* Print a plain user-specified message. */
1008 handle_pragma_message (cpp_reader
*ARG_UNUSED(dummy
))
1010 enum cpp_ttype token
;
1011 tree x
, message
= 0;
1013 token
= pragma_lex (&x
);
1014 if (token
== CPP_OPEN_PAREN
)
1016 token
= pragma_lex (&x
);
1017 if (token
== CPP_STRING
)
1020 GCC_BAD ("expected a string after %<#pragma message%>");
1021 if (pragma_lex (&x
) != CPP_CLOSE_PAREN
)
1022 GCC_BAD ("malformed %<#pragma message%>, ignored");
1024 else if (token
== CPP_STRING
)
1027 GCC_BAD ("expected a string after %<#pragma message%>");
1029 gcc_assert (message
);
1031 if (pragma_lex (&x
) != CPP_EOF
)
1032 warning (OPT_Wpragmas
, "junk at end of %<#pragma message%>");
1034 if (TREE_STRING_LENGTH (message
) > 1)
1035 inform (input_location
, "#pragma message: %s", TREE_STRING_POINTER (message
));
1038 /* Mark whether the current location is valid for a STDC pragma. */
1040 static bool valid_location_for_stdc_pragma
;
1043 mark_valid_location_for_stdc_pragma (bool flag
)
1045 valid_location_for_stdc_pragma
= flag
;
1048 /* Return true if the current location is valid for a STDC pragma. */
1051 valid_location_for_stdc_pragma_p (void)
1053 return valid_location_for_stdc_pragma
;
1056 enum pragma_switch_t
{ PRAGMA_ON
, PRAGMA_OFF
, PRAGMA_DEFAULT
, PRAGMA_BAD
};
1058 /* A STDC pragma must appear outside of external declarations or
1059 preceding all explicit declarations and statements inside a compound
1060 statement; its behavior is undefined if used in any other context.
1061 It takes a switch of ON, OFF, or DEFAULT. */
1063 static enum pragma_switch_t
1064 handle_stdc_pragma (const char *pname
)
1068 enum pragma_switch_t ret
;
1070 if (!valid_location_for_stdc_pragma_p ())
1072 warning (OPT_Wpragmas
, "invalid location for %<pragma %s%>, ignored",
1077 if (pragma_lex (&t
) != CPP_NAME
)
1079 warning (OPT_Wpragmas
, "malformed %<#pragma %s%>, ignored", pname
);
1083 arg
= IDENTIFIER_POINTER (t
);
1085 if (!strcmp (arg
, "ON"))
1087 else if (!strcmp (arg
, "OFF"))
1089 else if (!strcmp (arg
, "DEFAULT"))
1090 ret
= PRAGMA_DEFAULT
;
1093 warning (OPT_Wpragmas
, "malformed %<#pragma %s%>, ignored", pname
);
1097 if (pragma_lex (&t
) != CPP_EOF
)
1099 warning (OPT_Wpragmas
, "junk at end of %<#pragma %s%>", pname
);
1106 /* #pragma STDC FLOAT_CONST_DECIMAL64 ON
1107 #pragma STDC FLOAT_CONST_DECIMAL64 OFF
1108 #pragma STDC FLOAT_CONST_DECIMAL64 DEFAULT */
1111 handle_pragma_float_const_decimal64 (cpp_reader
*ARG_UNUSED (dummy
))
1113 if (c_dialect_cxx ())
1115 if (warn_unknown_pragmas
> in_system_header
)
1116 warning (OPT_Wunknown_pragmas
,
1117 "%<#pragma STDC FLOAT_CONST_DECIMAL64%> is not supported"
1122 if (!targetm
.decimal_float_supported_p ())
1124 if (warn_unknown_pragmas
> in_system_header
)
1125 warning (OPT_Wunknown_pragmas
,
1126 "%<#pragma STDC FLOAT_CONST_DECIMAL64%> is not supported"
1131 pedwarn (input_location
, OPT_Wpedantic
,
1132 "ISO C does not support %<#pragma STDC FLOAT_CONST_DECIMAL64%>");
1134 switch (handle_stdc_pragma ("STDC FLOAT_CONST_DECIMAL64"))
1137 set_float_const_decimal64 ();
1140 case PRAGMA_DEFAULT
:
1141 clear_float_const_decimal64 ();
1148 /* A vector of registered pragma callbacks, which is never freed. */
1150 static vec
<internal_pragma_handler
> registered_pragmas
;
1159 static vec
<pragma_ns_name
> registered_pp_pragmas
;
1161 struct omp_pragma_def
{ const char *name
; unsigned int id
; };
1162 static const struct omp_pragma_def omp_pragmas
[] = {
1163 { "atomic", PRAGMA_OMP_ATOMIC
},
1164 { "barrier", PRAGMA_OMP_BARRIER
},
1165 { "critical", PRAGMA_OMP_CRITICAL
},
1166 { "flush", PRAGMA_OMP_FLUSH
},
1167 { "for", PRAGMA_OMP_FOR
},
1168 { "master", PRAGMA_OMP_MASTER
},
1169 { "ordered", PRAGMA_OMP_ORDERED
},
1170 { "parallel", PRAGMA_OMP_PARALLEL
},
1171 { "section", PRAGMA_OMP_SECTION
},
1172 { "sections", PRAGMA_OMP_SECTIONS
},
1173 { "single", PRAGMA_OMP_SINGLE
},
1174 { "task", PRAGMA_OMP_TASK
},
1175 { "taskwait", PRAGMA_OMP_TASKWAIT
},
1176 { "taskyield", PRAGMA_OMP_TASKYIELD
},
1177 { "threadprivate", PRAGMA_OMP_THREADPRIVATE
}
1181 c_pp_lookup_pragma (unsigned int id
, const char **space
, const char **name
)
1183 const int n_omp_pragmas
= sizeof (omp_pragmas
) / sizeof (*omp_pragmas
);
1186 for (i
= 0; i
< n_omp_pragmas
; ++i
)
1187 if (omp_pragmas
[i
].id
== id
)
1190 *name
= omp_pragmas
[i
].name
;
1194 if (id
>= PRAGMA_FIRST_EXTERNAL
1195 && (id
< PRAGMA_FIRST_EXTERNAL
+ registered_pp_pragmas
.length ()))
1197 *space
= registered_pp_pragmas
[id
- PRAGMA_FIRST_EXTERNAL
].space
;
1198 *name
= registered_pp_pragmas
[id
- PRAGMA_FIRST_EXTERNAL
].name
;
1205 /* Front-end wrappers for pragma registration to avoid dragging
1206 cpplib.h in almost everywhere. */
1209 c_register_pragma_1 (const char *space
, const char *name
,
1210 internal_pragma_handler ihandler
, bool allow_expansion
)
1214 if (flag_preprocess_only
)
1216 pragma_ns_name ns_name
;
1218 if (!allow_expansion
)
1221 ns_name
.space
= space
;
1222 ns_name
.name
= name
;
1223 registered_pp_pragmas
.safe_push (ns_name
);
1224 id
= registered_pp_pragmas
.length ();
1225 id
+= PRAGMA_FIRST_EXTERNAL
- 1;
1229 registered_pragmas
.safe_push (ihandler
);
1230 id
= registered_pragmas
.length ();
1231 id
+= PRAGMA_FIRST_EXTERNAL
- 1;
1233 /* The C++ front end allocates 6 bits in cp_token; the C front end
1234 allocates 7 bits in c_token. At present this is sufficient. */
1235 gcc_assert (id
< 64);
1238 cpp_register_deferred_pragma (parse_in
, space
, name
, id
,
1239 allow_expansion
, false);
1242 /* Register a C pragma handler, using a space and a name. It disallows pragma
1243 expansion (if you want it, use c_register_pragma_with_expansion instead). */
1245 c_register_pragma (const char *space
, const char *name
,
1246 pragma_handler_1arg handler
)
1248 internal_pragma_handler ihandler
;
1250 ihandler
.handler
.handler_1arg
= handler
;
1251 ihandler
.extra_data
= false;
1252 ihandler
.data
= NULL
;
1253 c_register_pragma_1 (space
, name
, ihandler
, false);
1256 /* Register a C pragma handler, using a space and a name, it also carries an
1257 extra data field which can be used by the handler. It disallows pragma
1258 expansion (if you want it, use c_register_pragma_with_expansion_and_data
1261 c_register_pragma_with_data (const char *space
, const char *name
,
1262 pragma_handler_2arg handler
, void * data
)
1264 internal_pragma_handler ihandler
;
1266 ihandler
.handler
.handler_2arg
= handler
;
1267 ihandler
.extra_data
= true;
1268 ihandler
.data
= data
;
1269 c_register_pragma_1 (space
, name
, ihandler
, false);
1272 /* Register a C pragma handler, using a space and a name. It allows pragma
1273 expansion as in the following example:
1276 #pragma count (NUMBER)
1278 Name expansion is still disallowed. */
1280 c_register_pragma_with_expansion (const char *space
, const char *name
,
1281 pragma_handler_1arg handler
)
1283 internal_pragma_handler ihandler
;
1285 ihandler
.handler
.handler_1arg
= handler
;
1286 ihandler
.extra_data
= false;
1287 ihandler
.data
= NULL
;
1288 c_register_pragma_1 (space
, name
, ihandler
, true);
1291 /* Register a C pragma handler, using a space and a name, it also carries an
1292 extra data field which can be used by the handler. It allows pragma
1293 expansion as in the following example:
1296 #pragma count (NUMBER)
1298 Name expansion is still disallowed. */
1300 c_register_pragma_with_expansion_and_data (const char *space
, const char *name
,
1301 pragma_handler_2arg handler
,
1304 internal_pragma_handler ihandler
;
1306 ihandler
.handler
.handler_2arg
= handler
;
1307 ihandler
.extra_data
= true;
1308 ihandler
.data
= data
;
1309 c_register_pragma_1 (space
, name
, ihandler
, true);
1313 c_invoke_pragma_handler (unsigned int id
)
1315 internal_pragma_handler
*ihandler
;
1316 pragma_handler_1arg handler_1arg
;
1317 pragma_handler_2arg handler_2arg
;
1319 id
-= PRAGMA_FIRST_EXTERNAL
;
1320 ihandler
= ®istered_pragmas
[id
];
1321 if (ihandler
->extra_data
)
1323 handler_2arg
= ihandler
->handler
.handler_2arg
;
1324 handler_2arg (parse_in
, ihandler
->data
);
1328 handler_1arg
= ihandler
->handler
.handler_1arg
;
1329 handler_1arg (parse_in
);
1333 /* Set up front-end pragmas. */
1339 const int n_omp_pragmas
= sizeof (omp_pragmas
) / sizeof (*omp_pragmas
);
1342 for (i
= 0; i
< n_omp_pragmas
; ++i
)
1343 cpp_register_deferred_pragma (parse_in
, "omp", omp_pragmas
[i
].name
,
1344 omp_pragmas
[i
].id
, true, true);
1347 if (!flag_preprocess_only
)
1348 cpp_register_deferred_pragma (parse_in
, "GCC", "pch_preprocess",
1349 PRAGMA_GCC_PCH_PREPROCESS
, false, false);
1351 #ifdef HANDLE_PRAGMA_PACK_WITH_EXPANSION
1352 c_register_pragma_with_expansion (0, "pack", handle_pragma_pack
);
1354 c_register_pragma (0, "pack", handle_pragma_pack
);
1356 c_register_pragma (0, "weak", handle_pragma_weak
);
1357 c_register_pragma ("GCC", "visibility", handle_pragma_visibility
);
1359 c_register_pragma ("GCC", "diagnostic", handle_pragma_diagnostic
);
1360 c_register_pragma ("GCC", "target", handle_pragma_target
);
1361 c_register_pragma ("GCC", "optimize", handle_pragma_optimize
);
1362 c_register_pragma ("GCC", "push_options", handle_pragma_push_options
);
1363 c_register_pragma ("GCC", "pop_options", handle_pragma_pop_options
);
1364 c_register_pragma ("GCC", "reset_options", handle_pragma_reset_options
);
1366 c_register_pragma ("STDC", "FLOAT_CONST_DECIMAL64",
1367 handle_pragma_float_const_decimal64
);
1369 c_register_pragma_with_expansion (0, "redefine_extname",
1370 handle_pragma_redefine_extname
);
1372 c_register_pragma_with_expansion (0, "message", handle_pragma_message
);
1374 #ifdef REGISTER_TARGET_PRAGMAS
1375 REGISTER_TARGET_PRAGMAS ();
1378 /* Allow plugins to register their own pragmas. */
1379 invoke_plugin_callbacks (PLUGIN_PRAGMAS
, NULL
);
1382 #include "gt-c-family-c-pragma.h"