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? */
34 #include "tm_p.h" /* For REGISTER_TARGET_PRAGMAS (why is
35 this not a target hook?). */
39 #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;
317 FOR_EACH_VEC_ELT (pending_weak, pending_weaks, i, pe)
325 target = symtab_node_for_asm (id);
326 decl = build_decl (UNKNOWN_LOCATION,
327 target ? TREE_CODE (target->symbol.decl) : FUNCTION_DECL,
328 alias_id, default_function_type);
330 DECL_ARTIFICIAL (decl) = 1;
331 TREE_PUBLIC (decl) = 1;
332 DECL_WEAK (decl) = 1;
333 if (TREE_CODE (decl) == VAR_DECL)
334 TREE_STATIC (decl) = 1;
337 error ("%q+D aliased to undefined symbol %qE",
342 assemble_alias (decl, id);
346 /* #pragma weak name [= value] */
348 handle_pragma_weak (cpp_reader * ARG_UNUSED (dummy))
350 tree name, value, x, decl;
355 if (pragma_lex (&name) != CPP_NAME)
356 GCC_BAD ("malformed #pragma weak, ignored");
360 if (pragma_lex (&value) != CPP_NAME)
361 GCC_BAD ("malformed #pragma weak, ignored");
365 warning (OPT_Wpragmas, "junk at end of %<#pragma weak%>");
367 decl = identifier_global_value (name);
368 if (decl && DECL_P (decl))
370 apply_pragma_weak (decl, value);
372 assemble_alias (decl, value);
377 pe = VEC_safe_push (pending_weak, gc, pending_weaks, NULL);
383 /* GCC supports two #pragma directives for renaming the external
384 symbol associated with a declaration (DECL_ASSEMBLER_NAME), for
385 compatibility with the Solaris and VMS system headers. GCC also
386 has its own notation for this, __asm__("name") annotations.
388 Corner cases of these features and their interaction:
390 1) Both pragmas silently apply only to declarations with external
391 linkage (that is, TREE_PUBLIC || DECL_EXTERNAL). Asm labels
392 do not have this restriction.
394 2) In C++, both #pragmas silently apply only to extern "C" declarations.
395 Asm labels do not have this restriction.
397 3) If any of the three ways of changing DECL_ASSEMBLER_NAME is
398 applied to a decl whose DECL_ASSEMBLER_NAME is already set, and the
399 new name is different, a warning issues and the name does not change.
401 4) The "source name" for #pragma redefine_extname is the DECL_NAME,
402 *not* the DECL_ASSEMBLER_NAME.
404 5) If #pragma extern_prefix is in effect and a declaration occurs
405 with an __asm__ name, the #pragma extern_prefix is silently
406 ignored for that declaration.
408 6) If #pragma extern_prefix and #pragma redefine_extname apply to
409 the same declaration, whichever triggered first wins, and a warning
410 is issued. (We would like to have #pragma redefine_extname always
411 win, but it can appear either before or after the declaration, and
412 if it appears afterward, we have no way of knowing whether a modified
413 DECL_ASSEMBLER_NAME is due to #pragma extern_prefix.) */
415 typedef struct GTY(()) pending_redefinition_d {
418 } pending_redefinition;
420 DEF_VEC_O(pending_redefinition);
421 DEF_VEC_ALLOC_O(pending_redefinition,gc);
423 static GTY(()) VEC(pending_redefinition,gc) *pending_redefine_extname;
425 static void handle_pragma_redefine_extname (cpp_reader *);
427 /* #pragma redefine_extname oldname newname */
429 handle_pragma_redefine_extname (cpp_reader * ARG_UNUSED (dummy))
431 tree oldname, newname, decls, x;
435 if (pragma_lex (&oldname) != CPP_NAME)
436 GCC_BAD ("malformed #pragma redefine_extname, ignored");
437 if (pragma_lex (&newname) != CPP_NAME)
438 GCC_BAD ("malformed #pragma redefine_extname, ignored");
441 warning (OPT_Wpragmas, "junk at end of %<#pragma redefine_extname%>");
444 for (decls = c_linkage_bindings (oldname);
448 if (TREE_CODE (decls) == TREE_LIST)
450 decl = TREE_VALUE (decls);
451 decls = TREE_CHAIN (decls);
459 if ((TREE_PUBLIC (decl) || DECL_EXTERNAL (decl))
460 && (TREE_CODE (decl) == FUNCTION_DECL
461 || TREE_CODE (decl) == VAR_DECL))
464 if (DECL_ASSEMBLER_NAME_SET_P (decl))
466 const char *name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
467 name = targetm.strip_name_encoding (name);
469 if (strcmp (name, IDENTIFIER_POINTER (newname)))
470 warning (OPT_Wpragmas, "#pragma redefine_extname ignored due to "
471 "conflict with previous rename");
474 change_decl_assembler_name (decl, newname);
479 /* We have to add this to the rename list even if there's already
480 a global value that doesn't meet the above criteria, because in
481 C++ "struct foo {...};" puts "foo" in the current namespace but
482 does *not* conflict with a subsequent declaration of a function
483 or variable foo. See g++.dg/other/pragma-re-2.C. */
484 add_to_renaming_pragma_list (oldname, newname);
487 /* This is called from here and from ia64.c. */
489 add_to_renaming_pragma_list (tree oldname, tree newname)
492 pending_redefinition *p;
494 FOR_EACH_VEC_ELT (pending_redefinition, pending_redefine_extname, ix, p)
495 if (oldname == p->oldname)
497 if (p->newname != newname)
498 warning (OPT_Wpragmas, "#pragma redefine_extname ignored due to "
499 "conflict with previous #pragma redefine_extname");
503 p = VEC_safe_push (pending_redefinition, gc, pending_redefine_extname, NULL);
504 p->oldname = oldname;
505 p->newname = newname;
508 /* The current prefix set by #pragma extern_prefix. */
509 GTY(()) tree pragma_extern_prefix;
511 /* Hook from the front ends to apply the results of one of the preceding
512 pragmas that rename variables. */
515 maybe_apply_renaming_pragma (tree decl, tree asmname)
518 pending_redefinition *p;
520 /* The renaming pragmas are only applied to declarations with
522 if ((TREE_CODE (decl) != FUNCTION_DECL && TREE_CODE (decl) != VAR_DECL)
523 || (!TREE_PUBLIC (decl) && !DECL_EXTERNAL (decl))
524 || !has_c_linkage (decl))
527 /* If the DECL_ASSEMBLER_NAME is already set, it does not change,
528 but we may warn about a rename that conflicts. */
529 if (DECL_ASSEMBLER_NAME_SET_P (decl))
531 const char *oldname = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
532 oldname = targetm.strip_name_encoding (oldname);
534 if (asmname && strcmp (TREE_STRING_POINTER (asmname), oldname))
535 warning (OPT_Wpragmas, "asm declaration ignored due to "
536 "conflict with previous rename");
538 /* Take any pending redefine_extname off the list. */
539 FOR_EACH_VEC_ELT (pending_redefinition, pending_redefine_extname, ix, p)
540 if (DECL_NAME (decl) == p->oldname)
542 /* Only warn if there is a conflict. */
543 if (strcmp (IDENTIFIER_POINTER (p->newname), oldname))
544 warning (OPT_Wpragmas, "#pragma redefine_extname ignored due to "
545 "conflict with previous rename");
547 VEC_unordered_remove (pending_redefinition,
548 pending_redefine_extname, ix);
554 /* Find out if we have a pending #pragma redefine_extname. */
555 FOR_EACH_VEC_ELT (pending_redefinition, pending_redefine_extname, ix, p)
556 if (DECL_NAME (decl) == p->oldname)
558 tree newname = p->newname;
559 VEC_unordered_remove (pending_redefinition,
560 pending_redefine_extname, ix);
562 /* If we already have an asmname, #pragma redefine_extname is
563 ignored (with a warning if it conflicts). */
566 if (strcmp (TREE_STRING_POINTER (asmname),
567 IDENTIFIER_POINTER (newname)) != 0)
568 warning (OPT_Wpragmas, "#pragma redefine_extname ignored due to "
569 "conflict with __asm__ declaration");
573 /* Otherwise we use what we've got; #pragma extern_prefix is
575 return build_string (IDENTIFIER_LENGTH (newname),
576 IDENTIFIER_POINTER (newname));
579 /* If we've got an asmname, #pragma extern_prefix is silently ignored. */
583 /* If #pragma extern_prefix is in effect, apply it. */
584 if (pragma_extern_prefix)
586 const char *prefix = TREE_STRING_POINTER (pragma_extern_prefix);
587 size_t plen = TREE_STRING_LENGTH (pragma_extern_prefix) - 1;
589 const char *id = IDENTIFIER_POINTER (DECL_NAME (decl));
590 size_t ilen = IDENTIFIER_LENGTH (DECL_NAME (decl));
592 char *newname = (char *) alloca (plen + ilen + 1);
594 memcpy (newname, prefix, plen);
595 memcpy (newname + plen, id, ilen + 1);
597 return build_string (plen + ilen, newname);
605 static void handle_pragma_visibility (cpp_reader *);
607 static VEC (int, heap) *visstack;
609 /* Push the visibility indicated by STR onto the top of the #pragma
610 visibility stack. KIND is 0 for #pragma GCC visibility, 1 for
611 C++ namespace with visibility attribute and 2 for C++ builtin
612 ABI namespace. push_visibility/pop_visibility calls must have
613 matching KIND, it is not allowed to push visibility using one
614 KIND and pop using a different one. */
617 push_visibility (const char *str, int kind)
619 VEC_safe_push (int, heap, visstack,
620 ((int) default_visibility) | (kind << 8));
621 if (!strcmp (str, "default"))
622 default_visibility = VISIBILITY_DEFAULT;
623 else if (!strcmp (str, "internal"))
624 default_visibility = VISIBILITY_INTERNAL;
625 else if (!strcmp (str, "hidden"))
626 default_visibility = VISIBILITY_HIDDEN;
627 else if (!strcmp (str, "protected"))
628 default_visibility = VISIBILITY_PROTECTED;
630 GCC_BAD ("#pragma GCC visibility push() must specify default, internal, hidden or protected");
631 visibility_options.inpragma = 1;
634 /* Pop a level of the #pragma visibility stack. Return true if
638 pop_visibility (int kind)
640 if (!VEC_length (int, visstack))
642 if ((VEC_last (int, visstack) >> 8) != kind)
645 = (enum symbol_visibility) (VEC_pop (int, visstack) & 0xff);
646 visibility_options.inpragma
647 = VEC_length (int, visstack) != 0;
651 /* Sets the default visibility for symbols to something other than that
652 specified on the command line. */
655 handle_pragma_visibility (cpp_reader *dummy ATTRIBUTE_UNUSED)
657 /* Form is #pragma GCC visibility push(hidden)|pop */
659 enum cpp_ttype token;
660 enum { bad, push, pop } action = bad;
662 token = pragma_lex (&x);
663 if (token == CPP_NAME)
665 const char *op = IDENTIFIER_POINTER (x);
666 if (!strcmp (op, "push"))
668 else if (!strcmp (op, "pop"))
672 GCC_BAD ("#pragma GCC visibility must be followed by push or pop");
677 if (! pop_visibility (0))
678 GCC_BAD ("no matching push for %<#pragma GCC visibility pop%>");
682 if (pragma_lex (&x) != CPP_OPEN_PAREN)
683 GCC_BAD ("missing %<(%> after %<#pragma GCC visibility push%> - ignored");
684 token = pragma_lex (&x);
685 if (token != CPP_NAME)
686 GCC_BAD ("malformed #pragma GCC visibility push");
688 push_visibility (IDENTIFIER_POINTER (x), 0);
689 if (pragma_lex (&x) != CPP_CLOSE_PAREN)
690 GCC_BAD ("missing %<(%> after %<#pragma GCC visibility push%> - ignored");
693 if (pragma_lex (&x) != CPP_EOF)
694 warning (OPT_Wpragmas, "junk at end of %<#pragma GCC visibility%>");
698 handle_pragma_diagnostic(cpp_reader *ARG_UNUSED(dummy))
700 const char *kind_string, *option_string;
701 unsigned int option_index;
702 enum cpp_ttype token;
705 struct cl_option_handlers handlers;
707 token = pragma_lex (&x);
708 if (token != CPP_NAME)
709 GCC_BAD ("missing [error|warning|ignored] after %<#pragma GCC diagnostic%>");
710 kind_string = IDENTIFIER_POINTER (x);
711 if (strcmp (kind_string, "error") == 0)
713 else if (strcmp (kind_string, "warning") == 0)
715 else if (strcmp (kind_string, "ignored") == 0)
717 else if (strcmp (kind_string, "push") == 0)
719 diagnostic_push_diagnostics (global_dc, input_location);
722 else if (strcmp (kind_string, "pop") == 0)
724 diagnostic_pop_diagnostics (global_dc, input_location);
728 GCC_BAD ("expected [error|warning|ignored|push|pop] after %<#pragma GCC diagnostic%>");
730 token = pragma_lex (&x);
731 if (token != CPP_STRING)
732 GCC_BAD ("missing option after %<#pragma GCC diagnostic%> kind");
733 option_string = TREE_STRING_POINTER (x);
734 set_default_handlers (&handlers);
735 for (option_index = 0; option_index < cl_options_count; option_index++)
736 if (strcmp (cl_options[option_index].opt_text, option_string) == 0)
738 control_warning_option (option_index, (int) kind, kind != DK_IGNORED,
739 input_location, c_family_lang_mask, &handlers,
740 &global_options, &global_options_set,
744 GCC_BAD ("unknown option after %<#pragma GCC diagnostic%> kind");
747 /* Parse #pragma GCC target (xxx) to set target specific options. */
749 handle_pragma_target(cpp_reader *ARG_UNUSED(dummy))
751 enum cpp_ttype token;
753 bool close_paren_needed_p = false;
757 error ("#pragma GCC option is not allowed inside functions");
761 token = pragma_lex (&x);
762 if (token == CPP_OPEN_PAREN)
764 close_paren_needed_p = true;
765 token = pragma_lex (&x);
768 if (token != CPP_STRING)
770 GCC_BAD ("%<#pragma GCC option%> is not a string");
774 /* Strings are user options. */
777 tree args = NULL_TREE;
781 /* Build up the strings now as a tree linked list. Skip empty
783 if (TREE_STRING_LENGTH (x) > 0)
784 args = tree_cons (NULL_TREE, x, args);
786 token = pragma_lex (&x);
787 while (token == CPP_COMMA)
788 token = pragma_lex (&x);
790 while (token == CPP_STRING);
792 if (close_paren_needed_p)
794 if (token == CPP_CLOSE_PAREN)
795 token = pragma_lex (&x);
797 GCC_BAD ("%<#pragma GCC target (string [,string]...)%> does "
798 "not have a final %<)%>");
801 if (token != CPP_EOF)
803 error ("#pragma GCC target string... is badly formed");
807 /* put arguments in the order the user typed them. */
808 args = nreverse (args);
810 if (targetm.target_option.pragma_parse (args, NULL_TREE))
811 current_target_pragma = args;
815 /* Handle #pragma GCC optimize to set optimization options. */
817 handle_pragma_optimize (cpp_reader *ARG_UNUSED(dummy))
819 enum cpp_ttype token;
821 bool close_paren_needed_p = false;
822 tree optimization_previous_node = optimization_current_node;
826 error ("#pragma GCC optimize is not allowed inside functions");
830 token = pragma_lex (&x);
831 if (token == CPP_OPEN_PAREN)
833 close_paren_needed_p = true;
834 token = pragma_lex (&x);
837 if (token != CPP_STRING && token != CPP_NUMBER)
839 GCC_BAD ("%<#pragma GCC optimize%> is not a string or number");
843 /* Strings/numbers are user options. */
846 tree args = NULL_TREE;
850 /* Build up the numbers/strings now as a list. */
851 if (token != CPP_STRING || TREE_STRING_LENGTH (x) > 0)
852 args = tree_cons (NULL_TREE, x, args);
854 token = pragma_lex (&x);
855 while (token == CPP_COMMA)
856 token = pragma_lex (&x);
858 while (token == CPP_STRING || token == CPP_NUMBER);
860 if (close_paren_needed_p)
862 if (token == CPP_CLOSE_PAREN)
863 token = pragma_lex (&x);
865 GCC_BAD ("%<#pragma GCC optimize (string [,string]...)%> does "
866 "not have a final %<)%>");
869 if (token != CPP_EOF)
871 error ("#pragma GCC optimize string... is badly formed");
875 /* put arguments in the order the user typed them. */
876 args = nreverse (args);
878 parse_optimize_options (args, false);
879 current_optimize_pragma = chainon (current_optimize_pragma, args);
880 optimization_current_node = build_optimization_node ();
881 c_cpp_builtins_optimize_pragma (parse_in,
882 optimization_previous_node,
883 optimization_current_node);
887 /* Stack of the #pragma GCC options created with #pragma GCC push_option. Save
888 both the binary representation of the options and the TREE_LIST of
889 strings that will be added to the function's attribute list. */
890 typedef struct GTY(()) opt_stack {
891 struct opt_stack *prev;
894 tree optimize_binary;
895 tree optimize_strings;
898 static GTY(()) struct opt_stack * options_stack;
900 /* Handle #pragma GCC push_options to save the current target and optimization
904 handle_pragma_push_options (cpp_reader *ARG_UNUSED(dummy))
906 enum cpp_ttype token;
910 token = pragma_lex (&x);
911 if (token != CPP_EOF)
913 warning (OPT_Wpragmas, "junk at end of %<#pragma push_options%>");
917 p = ggc_alloc_opt_stack ();
918 p->prev = options_stack;
921 /* Save optimization and target flags in binary format. */
922 p->optimize_binary = build_optimization_node ();
923 p->target_binary = build_target_option_node ();
925 /* Save optimization and target flags in string list format. */
926 p->optimize_strings = copy_list (current_optimize_pragma);
927 p->target_strings = copy_list (current_target_pragma);
930 /* Handle #pragma GCC pop_options to restore the current target and
931 optimization options from a previous push_options. */
934 handle_pragma_pop_options (cpp_reader *ARG_UNUSED(dummy))
936 enum cpp_ttype token;
940 token = pragma_lex (&x);
941 if (token != CPP_EOF)
943 warning (OPT_Wpragmas, "junk at end of %<#pragma pop_options%>");
949 warning (OPT_Wpragmas,
950 "%<#pragma GCC pop_options%> without a corresponding "
951 "%<#pragma GCC push_options%>");
956 options_stack = p->prev;
958 if (p->target_binary != target_option_current_node)
960 (void) targetm.target_option.pragma_parse (NULL_TREE, p->target_binary);
961 target_option_current_node = p->target_binary;
964 if (p->optimize_binary != optimization_current_node)
966 tree old_optimize = optimization_current_node;
967 cl_optimization_restore (&global_options,
968 TREE_OPTIMIZATION (p->optimize_binary));
969 c_cpp_builtins_optimize_pragma (parse_in, old_optimize,
971 optimization_current_node = p->optimize_binary;
974 current_target_pragma = p->target_strings;
975 current_optimize_pragma = p->optimize_strings;
978 /* Handle #pragma GCC reset_options to restore the current target and
979 optimization options to the original options used on the command line. */
982 handle_pragma_reset_options (cpp_reader *ARG_UNUSED(dummy))
984 enum cpp_ttype token;
986 tree new_optimize = optimization_default_node;
987 tree new_target = target_option_default_node;
989 token = pragma_lex (&x);
990 if (token != CPP_EOF)
992 warning (OPT_Wpragmas, "junk at end of %<#pragma reset_options%>");
996 if (new_target != target_option_current_node)
998 (void) targetm.target_option.pragma_parse (NULL_TREE, new_target);
999 target_option_current_node = new_target;
1002 if (new_optimize != optimization_current_node)
1004 tree old_optimize = optimization_current_node;
1005 cl_optimization_restore (&global_options,
1006 TREE_OPTIMIZATION (new_optimize));
1007 c_cpp_builtins_optimize_pragma (parse_in, old_optimize, new_optimize);
1008 optimization_current_node = new_optimize;
1011 current_target_pragma = NULL_TREE;
1012 current_optimize_pragma = NULL_TREE;
1015 /* Print a plain user-specified message. */
1018 handle_pragma_message (cpp_reader *ARG_UNUSED(dummy))
1020 enum cpp_ttype token;
1021 tree x, message = 0;
1023 token = pragma_lex (&x);
1024 if (token == CPP_OPEN_PAREN)
1026 token = pragma_lex (&x);
1027 if (token == CPP_STRING)
1030 GCC_BAD ("expected a string after %<#pragma message%>");
1031 if (pragma_lex (&x) != CPP_CLOSE_PAREN)
1032 GCC_BAD ("malformed %<#pragma message%>, ignored");
1034 else if (token == CPP_STRING)
1037 GCC_BAD ("expected a string after %<#pragma message%>");
1039 gcc_assert (message);
1041 if (pragma_lex (&x) != CPP_EOF)
1042 warning (OPT_Wpragmas, "junk at end of %<#pragma message%>");
1044 if (TREE_STRING_LENGTH (message) > 1)
1045 inform (input_location, "#pragma message: %s", TREE_STRING_POINTER (message));
1048 /* Mark whether the current location is valid for a STDC pragma. */
1050 static bool valid_location_for_stdc_pragma;
1053 mark_valid_location_for_stdc_pragma (bool flag)
1055 valid_location_for_stdc_pragma = flag;
1058 /* Return true if the current location is valid for a STDC pragma. */
1061 valid_location_for_stdc_pragma_p (void)
1063 return valid_location_for_stdc_pragma;
1066 enum pragma_switch_t { PRAGMA_ON, PRAGMA_OFF, PRAGMA_DEFAULT, PRAGMA_BAD };
1068 /* A STDC pragma must appear outside of external declarations or
1069 preceding all explicit declarations and statements inside a compound
1070 statement; its behavior is undefined if used in any other context.
1071 It takes a switch of ON, OFF, or DEFAULT. */
1073 static enum pragma_switch_t
1074 handle_stdc_pragma (const char *pname)
1078 enum pragma_switch_t ret;
1080 if (!valid_location_for_stdc_pragma_p ())
1082 warning (OPT_Wpragmas, "invalid location for %<pragma %s%>, ignored",
1087 if (pragma_lex (&t) != CPP_NAME)
1089 warning (OPT_Wpragmas, "malformed %<#pragma %s%>, ignored", pname);
1093 arg = IDENTIFIER_POINTER (t);
1095 if (!strcmp (arg, "ON"))
1097 else if (!strcmp (arg, "OFF"))
1099 else if (!strcmp (arg, "DEFAULT"))
1100 ret = PRAGMA_DEFAULT;
1103 warning (OPT_Wpragmas, "malformed %<#pragma %s%>, ignored", pname);
1107 if (pragma_lex (&t) != CPP_EOF)
1109 warning (OPT_Wpragmas, "junk at end of %<#pragma %s%>", pname);
1116 /* #pragma STDC FLOAT_CONST_DECIMAL64 ON
1117 #pragma STDC FLOAT_CONST_DECIMAL64 OFF
1118 #pragma STDC FLOAT_CONST_DECIMAL64 DEFAULT */
1121 handle_pragma_float_const_decimal64 (cpp_reader *ARG_UNUSED (dummy))
1123 if (c_dialect_cxx ())
1125 if (warn_unknown_pragmas > in_system_header)
1126 warning (OPT_Wunknown_pragmas,
1127 "%<#pragma STDC FLOAT_CONST_DECIMAL64%> is not supported"
1132 if (!targetm.decimal_float_supported_p ())
1134 if (warn_unknown_pragmas > in_system_header)
1135 warning (OPT_Wunknown_pragmas,
1136 "%<#pragma STDC FLOAT_CONST_DECIMAL64%> is not supported"
1141 pedwarn (input_location, OPT_Wpedantic,
1142 "ISO C does not support %<#pragma STDC FLOAT_CONST_DECIMAL64%>");
1144 switch (handle_stdc_pragma ("STDC FLOAT_CONST_DECIMAL64"))
1147 set_float_const_decimal64 ();
1150 case PRAGMA_DEFAULT:
1151 clear_float_const_decimal64 ();
1158 /* A vector of registered pragma callbacks, which is never freed. */
1159 DEF_VEC_O (internal_pragma_handler);
1160 DEF_VEC_ALLOC_O (internal_pragma_handler, heap);
1162 static VEC(internal_pragma_handler, heap) *registered_pragmas;
1170 DEF_VEC_O (pragma_ns_name);
1171 DEF_VEC_ALLOC_O (pragma_ns_name, heap);
1173 static VEC(pragma_ns_name, heap) *registered_pp_pragmas;
1175 struct omp_pragma_def { const char *name; unsigned int id; };
1176 static const struct omp_pragma_def omp_pragmas[] = {
1177 { "atomic", PRAGMA_OMP_ATOMIC },
1178 { "barrier", PRAGMA_OMP_BARRIER },
1179 { "critical", PRAGMA_OMP_CRITICAL },
1180 { "flush", PRAGMA_OMP_FLUSH },
1181 { "for", PRAGMA_OMP_FOR },
1182 { "master", PRAGMA_OMP_MASTER },
1183 { "ordered", PRAGMA_OMP_ORDERED },
1184 { "parallel", PRAGMA_OMP_PARALLEL },
1185 { "section", PRAGMA_OMP_SECTION },
1186 { "sections", PRAGMA_OMP_SECTIONS },
1187 { "single", PRAGMA_OMP_SINGLE },
1188 { "task", PRAGMA_OMP_TASK },
1189 { "taskwait", PRAGMA_OMP_TASKWAIT },
1190 { "taskyield", PRAGMA_OMP_TASKYIELD },
1191 { "threadprivate", PRAGMA_OMP_THREADPRIVATE }
1195 c_pp_lookup_pragma (unsigned int id, const char **space, const char **name)
1197 const int n_omp_pragmas = sizeof (omp_pragmas) / sizeof (*omp_pragmas);
1200 for (i = 0; i < n_omp_pragmas; ++i)
1201 if (omp_pragmas[i].id == id)
1204 *name = omp_pragmas[i].name;
1208 if (id >= PRAGMA_FIRST_EXTERNAL
1209 && (id < PRAGMA_FIRST_EXTERNAL
1210 + VEC_length (pragma_ns_name, registered_pp_pragmas)))
1212 *space = VEC_index (pragma_ns_name, registered_pp_pragmas,
1213 id - PRAGMA_FIRST_EXTERNAL)->space;
1214 *name = VEC_index (pragma_ns_name, registered_pp_pragmas,
1215 id - PRAGMA_FIRST_EXTERNAL)->name;
1222 /* Front-end wrappers for pragma registration to avoid dragging
1223 cpplib.h in almost everywhere. */
1226 c_register_pragma_1 (const char *space, const char *name,
1227 internal_pragma_handler ihandler, bool allow_expansion)
1231 if (flag_preprocess_only)
1233 pragma_ns_name ns_name;
1235 if (!allow_expansion)
1238 ns_name.space = space;
1239 ns_name.name = name;
1240 VEC_safe_push (pragma_ns_name, heap, registered_pp_pragmas, &ns_name);
1241 id = VEC_length (pragma_ns_name, registered_pp_pragmas);
1242 id += PRAGMA_FIRST_EXTERNAL - 1;
1246 VEC_safe_push (internal_pragma_handler, heap, registered_pragmas,
1248 id = VEC_length (internal_pragma_handler, registered_pragmas);
1249 id += PRAGMA_FIRST_EXTERNAL - 1;
1251 /* The C++ front end allocates 6 bits in cp_token; the C front end
1252 allocates 7 bits in c_token. At present this is sufficient. */
1253 gcc_assert (id < 64);
1256 cpp_register_deferred_pragma (parse_in, space, name, id,
1257 allow_expansion, false);
1260 /* Register a C pragma handler, using a space and a name. It disallows pragma
1261 expansion (if you want it, use c_register_pragma_with_expansion instead). */
1263 c_register_pragma (const char *space, const char *name,
1264 pragma_handler_1arg handler)
1266 internal_pragma_handler ihandler;
1268 ihandler.handler.handler_1arg = handler;
1269 ihandler.extra_data = false;
1270 ihandler.data = NULL;
1271 c_register_pragma_1 (space, name, ihandler, false);
1274 /* Register a C pragma handler, using a space and a name, it also carries an
1275 extra data field which can be used by the handler. It disallows pragma
1276 expansion (if you want it, use c_register_pragma_with_expansion_and_data
1279 c_register_pragma_with_data (const char *space, const char *name,
1280 pragma_handler_2arg handler, void * data)
1282 internal_pragma_handler ihandler;
1284 ihandler.handler.handler_2arg = handler;
1285 ihandler.extra_data = true;
1286 ihandler.data = data;
1287 c_register_pragma_1 (space, name, ihandler, false);
1290 /* Register a C pragma handler, using a space and a name. It allows pragma
1291 expansion as in the following example:
1294 #pragma count (NUMBER)
1296 Name expansion is still disallowed. */
1298 c_register_pragma_with_expansion (const char *space, const char *name,
1299 pragma_handler_1arg handler)
1301 internal_pragma_handler ihandler;
1303 ihandler.handler.handler_1arg = handler;
1304 ihandler.extra_data = false;
1305 ihandler.data = NULL;
1306 c_register_pragma_1 (space, name, ihandler, true);
1309 /* Register a C pragma handler, using a space and a name, it also carries an
1310 extra data field which can be used by the handler. It allows pragma
1311 expansion as in the following example:
1314 #pragma count (NUMBER)
1316 Name expansion is still disallowed. */
1318 c_register_pragma_with_expansion_and_data (const char *space, const char *name,
1319 pragma_handler_2arg handler,
1322 internal_pragma_handler ihandler;
1324 ihandler.handler.handler_2arg = handler;
1325 ihandler.extra_data = true;
1326 ihandler.data = data;
1327 c_register_pragma_1 (space, name, ihandler, true);
1331 c_invoke_pragma_handler (unsigned int id)
1333 internal_pragma_handler *ihandler;
1334 pragma_handler_1arg handler_1arg;
1335 pragma_handler_2arg handler_2arg;
1337 id -= PRAGMA_FIRST_EXTERNAL;
1338 ihandler = VEC_index (internal_pragma_handler, registered_pragmas, id);
1339 if (ihandler->extra_data)
1341 handler_2arg = ihandler->handler.handler_2arg;
1342 handler_2arg (parse_in, ihandler->data);
1346 handler_1arg = ihandler->handler.handler_1arg;
1347 handler_1arg (parse_in);
1351 /* Set up front-end pragmas. */
1357 const int n_omp_pragmas = sizeof (omp_pragmas) / sizeof (*omp_pragmas);
1360 for (i = 0; i < n_omp_pragmas; ++i)
1361 cpp_register_deferred_pragma (parse_in, "omp", omp_pragmas[i].name,
1362 omp_pragmas[i].id, true, true);
1365 if (!flag_preprocess_only)
1366 cpp_register_deferred_pragma (parse_in, "GCC", "pch_preprocess",
1367 PRAGMA_GCC_PCH_PREPROCESS, false, false);
1369 #ifdef HANDLE_PRAGMA_PACK_WITH_EXPANSION
1370 c_register_pragma_with_expansion (0, "pack", handle_pragma_pack);
1372 c_register_pragma (0, "pack", handle_pragma_pack);
1374 c_register_pragma (0, "weak", handle_pragma_weak);
1375 c_register_pragma ("GCC", "visibility", handle_pragma_visibility);
1377 c_register_pragma ("GCC", "diagnostic", handle_pragma_diagnostic);
1378 c_register_pragma ("GCC", "target", handle_pragma_target);
1379 c_register_pragma ("GCC", "optimize", handle_pragma_optimize);
1380 c_register_pragma ("GCC", "push_options", handle_pragma_push_options);
1381 c_register_pragma ("GCC", "pop_options", handle_pragma_pop_options);
1382 c_register_pragma ("GCC", "reset_options", handle_pragma_reset_options);
1384 c_register_pragma ("STDC", "FLOAT_CONST_DECIMAL64",
1385 handle_pragma_float_const_decimal64);
1387 c_register_pragma_with_expansion (0, "redefine_extname",
1388 handle_pragma_redefine_extname);
1390 c_register_pragma_with_expansion (0, "message", handle_pragma_message);
1392 #ifdef REGISTER_TARGET_PRAGMAS
1393 REGISTER_TARGET_PRAGMAS ();
1396 /* Allow plugins to register their own pragmas. */
1397 invoke_plugin_callbacks (PLUGIN_PRAGMAS, NULL);
1400 #include "gt-c-family-c-pragma.h"