1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001 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 2, 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 COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
33 #include "tree-inline.h"
49 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
51 { NORMAL, /* Ordinary declaration */
52 FUNCDEF, /* Function definition */
53 PARM, /* Declaration of parm before function body */
54 FIELD, /* Declaration inside struct or union */
55 BITFIELD, /* Likewise but with specified width */
56 TYPENAME}; /* Typename (inside cast or sizeof) */
59 /* Nonzero if we have seen an invalid cross reference
60 to a struct, union, or enum, but not yet printed the message. */
62 tree pending_invalid_xref;
63 /* File and line to appear in the eventual error message. */
64 const char *pending_invalid_xref_file;
65 int pending_invalid_xref_line;
67 /* While defining an enum type, this is 1 plus the last enumerator
68 constant value. Note that will do not have to save this or `enum_overflow'
69 around nested function definition since such a definition could only
70 occur in an enum value expression and we don't use these variables in
73 static tree enum_next_value;
75 /* Nonzero means that there was overflow computing enum_next_value. */
77 static int enum_overflow;
79 /* Parsing a function declarator leaves a list of parameter names
80 or a chain or parameter decls here. */
82 static tree last_function_parms;
84 /* Parsing a function declarator leaves here a chain of structure
85 and enum types declared in the parmlist. */
87 static tree last_function_parm_tags;
89 /* After parsing the declarator that starts a function definition,
90 `start_function' puts here the list of parameter names or chain of decls.
91 `store_parm_decls' finds it here. */
93 static tree current_function_parms;
95 /* Similar, for last_function_parm_tags. */
96 static tree current_function_parm_tags;
98 /* Similar, for the file and line that the prototype came from if this is
99 an old-style definition. */
100 static const char *current_function_prototype_file;
101 static int current_function_prototype_line;
103 /* The current statement tree. */
105 static struct stmt_tree_s c_stmt_tree;
107 /* The current scope statement stack. */
109 static tree c_scope_stmt_stack;
111 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
112 that have names. Here so we can clear out their names' definitions
113 at the end of the function. */
115 static tree named_labels;
117 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
119 static tree shadowed_labels;
121 /* Nonzero when store_parm_decls is called indicates a varargs function.
122 Value not meaningful after store_parm_decls. */
124 static int c_function_varargs;
126 /* Set to 0 at beginning of a function definition, set to 1 if
127 a return statement that specifies a return value is seen. */
129 int current_function_returns_value;
131 /* Set to 0 at beginning of a function definition, set to 1 if
132 a return statement with no argument is seen. */
134 int current_function_returns_null;
136 /* Set to nonzero by `grokdeclarator' for a function
137 whose return type is defaulted, if warnings for this are desired. */
139 static int warn_about_return_type;
141 /* Nonzero when starting a function declared `extern inline'. */
143 static int current_extern_inline;
145 /* For each binding contour we allocate a binding_level structure
146 * which records the names defined in that contour.
149 * 1) one for each function definition,
150 * where internal declarations of the parameters appear.
151 * 2) one for each compound statement,
152 * to record its declarations.
154 * The current meaning of a name can be found by searching the levels from
155 * the current one out to the global one.
158 /* Note that the information in the `names' component of the global contour
159 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
163 /* A chain of _DECL nodes for all variables, constants, functions,
164 and typedef types. These are in the reverse of the order supplied.
168 /* A list of structure, union and enum definitions,
169 * for looking up tag names.
170 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
171 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
172 * or ENUMERAL_TYPE node.
176 /* For each level, a list of shadowed outer-level local definitions
177 to be restored when this level is popped.
178 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
179 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
182 /* For each level (except not the global one),
183 a chain of BLOCK nodes for all the levels
184 that were entered and exited one level down. */
187 /* The BLOCK node for this level, if one has been preallocated.
188 If 0, the BLOCK is allocated (if needed) when the level is popped. */
191 /* The binding level which this one is contained in (inherits from). */
192 struct binding_level *level_chain;
194 /* Nonzero for the level that holds the parameters of a function. */
197 /* Nonzero if this level "doesn't exist" for tags. */
198 char tag_transparent;
200 /* Nonzero if sublevels of this level "don't exist" for tags.
201 This is set in the parm level of a function definition
202 while reading the function body, so that the outermost block
203 of the function body will be tag-transparent. */
204 char subblocks_tag_transparent;
206 /* Nonzero means make a BLOCK for this level regardless of all else. */
209 /* Nonzero means make a BLOCK if this level has any subblocks. */
210 char keep_if_subblocks;
212 /* Number of decls in `names' that have incomplete
213 structure or union types. */
216 /* A list of decls giving the (reversed) specified order of parms,
217 not including any forward-decls in the parmlist.
218 This is so we can put the parms in proper order for assign_parms. */
222 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
224 /* The binding level currently in effect. */
226 static struct binding_level *current_binding_level;
228 /* A chain of binding_level structures awaiting reuse. */
230 static struct binding_level *free_binding_level;
232 /* The outermost binding level, for names of file scope.
233 This is created when the compiler is started and exists
234 through the entire run. */
236 static struct binding_level *global_binding_level;
238 /* Binding level structures are initialized by copying this one. */
240 static struct binding_level clear_binding_level
241 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, 0,
244 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
246 static int keep_next_level_flag;
248 /* Nonzero means make a BLOCK for the next level pushed
249 if it has subblocks. */
251 static int keep_next_if_subblocks;
253 /* The chain of outer levels of label scopes.
254 This uses the same data structure used for binding levels,
255 but it works differently: each link in the chain records
256 saved values of named_labels and shadowed_labels for
257 a label binding level outside the current one. */
259 static struct binding_level *label_level_chain;
261 /* Functions called automatically at the beginning and end of execution. */
263 tree static_ctors, static_dtors;
265 /* Forward declarations. */
267 static struct binding_level * make_binding_level PARAMS ((void));
268 static void mark_binding_level PARAMS ((void *));
269 static void clear_limbo_values PARAMS ((tree));
270 static int duplicate_decls PARAMS ((tree, tree, int));
271 static int redeclaration_error_message PARAMS ((tree, tree));
272 static void storedecls PARAMS ((tree));
273 static void storetags PARAMS ((tree));
274 static tree lookup_tag PARAMS ((enum tree_code, tree,
275 struct binding_level *, int));
276 static tree lookup_tag_reverse PARAMS ((tree));
277 static tree grokdeclarator PARAMS ((tree, tree, enum decl_context,
279 static tree grokparms PARAMS ((tree, int));
280 static void layout_array_type PARAMS ((tree));
281 static tree c_make_fname_decl PARAMS ((tree, int));
282 static void c_expand_body PARAMS ((tree, int, int));
284 /* C-specific option variables. */
286 /* Nonzero means allow type mismatches in conditional expressions;
287 just make their values `void'. */
289 int flag_cond_mismatch;
291 /* Nonzero means don't recognize the keyword `asm'. */
295 /* Nonzero means do some things the same way PCC does. */
297 int flag_traditional;
299 /* Nonzero means enable C89 Amendment 1 features. */
303 /* Nonzero means use the ISO C99 dialect of C. */
307 /* Nonzero means that we have builtin functions, and main is an int */
311 /* Nonzero means add default format_arg attributes for functions not
314 int flag_noniso_default_format_attributes = 1;
316 /* Nonzero means to allow single precision math even if we're generally
317 being traditional. */
318 int flag_allow_single_precision = 0;
320 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
322 int flag_signed_bitfields = 1;
323 int explicit_flag_signed_bitfields = 0;
325 /* Nonzero means warn about use of implicit int. */
327 int warn_implicit_int;
329 /* Nonzero means warn about usage of long long when `-pedantic'. */
331 int warn_long_long = 1;
333 /* Nonzero means message about use of implicit function declarations;
334 1 means warning; 2 means error. */
336 int mesg_implicit_function_declaration = -1;
338 /* Nonzero means give string constants the type `const char *'
339 to get extra warnings from them. These warnings will be too numerous
340 to be useful, except in thoroughly ANSIfied programs. */
342 int flag_const_strings;
344 /* Nonzero means warn about pointer casts that can drop a type qualifier
345 from the pointer target type. */
349 /* Nonzero means warn when casting a function call to a type that does
350 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
351 when there is no previous declaration of sqrt or malloc. */
353 int warn_bad_function_cast;
355 /* Warn about functions which might be candidates for format attributes. */
357 int warn_missing_format_attribute;
359 /* Warn about traditional constructs whose meanings changed in ANSI C. */
361 int warn_traditional;
363 /* Nonzero means warn about sizeof(function) or addition/subtraction
364 of function pointers. */
366 int warn_pointer_arith;
368 /* Nonzero means warn for non-prototype function decls
369 or non-prototyped defs without previous prototype. */
371 int warn_strict_prototypes;
373 /* Nonzero means warn for any global function def
374 without separate previous prototype decl. */
376 int warn_missing_prototypes;
378 /* Nonzero means warn for any global function def
379 without separate previous decl. */
381 int warn_missing_declarations;
383 /* Nonzero means warn about multiple (redundant) decls for the same single
384 variable or function. */
386 int warn_redundant_decls = 0;
388 /* Nonzero means warn about extern declarations of objects not at
389 file-scope level and about *all* declarations of functions (whether
390 extern or static) not at file-scope level. Note that we exclude
391 implicit function declarations. To get warnings about those, use
394 int warn_nested_externs = 0;
396 /* Warn about a subscript that has type char. */
398 int warn_char_subscripts = 0;
400 /* Warn if a type conversion is done that might have confusing results. */
404 /* Warn if adding () is suggested. */
406 int warn_parentheses;
408 /* Warn if initializer is not completely bracketed. */
410 int warn_missing_braces;
412 /* Warn if main is suspicious. */
416 /* Warn about #pragma directives that are not recognised. */
418 int warn_unknown_pragmas = 0; /* Tri state variable. */
420 /* Warn about comparison of signed and unsigned values.
421 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
423 int warn_sign_compare = -1;
425 /* Warn about testing equality of floating point numbers. */
427 int warn_float_equal = 0;
429 /* Nonzero means warn about use of multicharacter literals. */
431 int warn_multichar = 1;
433 /* The variant of the C language being processed. */
435 c_language_kind c_language = clk_c;
437 /* Nonzero means `$' can be in an identifier. */
439 #ifndef DOLLARS_IN_IDENTIFIERS
440 #define DOLLARS_IN_IDENTIFIERS 1
442 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
444 /* Decode the string P as a language-specific option for C.
445 Return the number of strings consumed. Should not complain
446 if it does not recognise the option. */
449 c_decode_option (argc, argv)
450 int argc ATTRIBUTE_UNUSED;
453 int strings_processed;
456 strings_processed = cpp_handle_option (parse_in, argc, argv);
458 if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
460 warning ("-traditional is deprecated and may be removed");
461 flag_traditional = 1;
462 flag_writable_strings = 1;
464 else if (!strcmp (p, "-fallow-single-precision"))
465 flag_allow_single_precision = 1;
466 else if (!strcmp (p, "-fhosted") || !strcmp (p, "-fno-freestanding"))
471 else if (!strcmp (p, "-ffreestanding") || !strcmp (p, "-fno-hosted"))
475 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
479 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
481 flag_traditional = 0;
482 flag_writable_strings = 0;
484 else if (!strncmp (p, "-std=", 5))
486 /* Select the appropriate language standard. We currently
488 -std=iso9899:1990 same as -ansi
489 -std=iso9899:199409 ISO C as modified in amend. 1
490 -std=iso9899:1999 ISO C 99
491 -std=c89 same as -std=iso9899:1990
492 -std=c99 same as -std=iso9899:1999
493 -std=gnu89 default, iso9899:1990 + gnu extensions
494 -std=gnu99 iso9899:1999 + gnu extensions
496 const char *const argstart = &p[5];
498 if (!strcmp (argstart, "iso9899:1990")
499 || !strcmp (argstart, "c89"))
504 flag_traditional = 0;
505 flag_writable_strings = 0;
507 flag_no_nonansi_builtin = 1;
508 flag_noniso_default_format_attributes = 0;
511 else if (!strcmp (argstart, "iso9899:199409"))
516 else if (!strcmp (argstart, "iso9899:199x")
517 || !strcmp (argstart, "iso9899:1999")
518 || !strcmp (argstart, "c9x")
519 || !strcmp (argstart, "c99"))
521 flag_traditional = 0;
522 flag_writable_strings = 0;
524 flag_no_nonansi_builtin = 1;
525 flag_noniso_default_format_attributes = 0;
529 else if (!strcmp (argstart, "gnu89"))
531 flag_traditional = 0;
532 flag_writable_strings = 0;
534 flag_no_nonansi_builtin = 0;
535 flag_noniso_default_format_attributes = 1;
539 else if (!strcmp (argstart, "gnu9x") || !strcmp (argstart, "gnu99"))
541 flag_traditional = 0;
542 flag_writable_strings = 0;
544 flag_no_nonansi_builtin = 0;
545 flag_noniso_default_format_attributes = 1;
550 error ("unknown C standard `%s'", argstart);
552 else if (!strcmp (p, "-fdollars-in-identifiers"))
553 dollars_in_ident = 1;
554 else if (!strcmp (p, "-fno-dollars-in-identifiers"))
555 dollars_in_ident = 0;
556 else if (!strcmp (p, "-fsigned-char"))
557 flag_signed_char = 1;
558 else if (!strcmp (p, "-funsigned-char"))
559 flag_signed_char = 0;
560 else if (!strcmp (p, "-fno-signed-char"))
561 flag_signed_char = 0;
562 else if (!strcmp (p, "-fno-unsigned-char"))
563 flag_signed_char = 1;
564 else if (!strcmp (p, "-fsigned-bitfields")
565 || !strcmp (p, "-fno-unsigned-bitfields"))
567 flag_signed_bitfields = 1;
568 explicit_flag_signed_bitfields = 1;
570 else if (!strcmp (p, "-funsigned-bitfields")
571 || !strcmp (p, "-fno-signed-bitfields"))
573 flag_signed_bitfields = 0;
574 explicit_flag_signed_bitfields = 1;
576 else if (!strcmp (p, "-fshort-enums"))
577 flag_short_enums = 1;
578 else if (!strcmp (p, "-fno-short-enums"))
579 flag_short_enums = 0;
580 else if (!strcmp (p, "-fshort-wchar"))
581 flag_short_wchar = 1;
582 else if (!strcmp (p, "-fno-short-wchar"))
583 flag_short_wchar = 0;
584 else if (!strcmp (p, "-fcond-mismatch"))
585 flag_cond_mismatch = 1;
586 else if (!strcmp (p, "-fno-cond-mismatch"))
587 flag_cond_mismatch = 0;
588 else if (!strcmp (p, "-fshort-double"))
589 flag_short_double = 1;
590 else if (!strcmp (p, "-fno-short-double"))
591 flag_short_double = 0;
592 else if (!strcmp (p, "-fasm"))
594 else if (!strcmp (p, "-fno-asm"))
596 else if (!strcmp (p, "-fbuiltin"))
598 else if (!strcmp (p, "-fno-builtin"))
600 else if (!strncmp (p, "-fno-builtin-", strlen ("-fno-builtin-")))
601 disable_builtin_function (p + strlen ("-fno-builtin-"));
602 else if (p[0] == '-' && p[1] == 'f' && dump_switch_p (p + 2))
604 else if (!strcmp (p, "-ansi"))
606 else if (!strcmp (p, "-Werror-implicit-function-declaration"))
607 mesg_implicit_function_declaration = 2;
608 else if (!strcmp (p, "-Wimplicit-function-declaration"))
609 mesg_implicit_function_declaration = 1;
610 else if (!strcmp (p, "-Wno-implicit-function-declaration"))
611 mesg_implicit_function_declaration = 0;
612 else if (!strcmp (p, "-Wimplicit-int"))
613 warn_implicit_int = 1;
614 else if (!strcmp (p, "-Wno-implicit-int"))
615 warn_implicit_int = 0;
616 else if (!strcmp (p, "-Wimplicit"))
618 warn_implicit_int = 1;
619 if (mesg_implicit_function_declaration != 2)
620 mesg_implicit_function_declaration = 1;
622 else if (!strcmp (p, "-Wno-implicit"))
623 warn_implicit_int = 0, mesg_implicit_function_declaration = 0;
624 else if (!strcmp (p, "-Wlong-long"))
626 else if (!strcmp (p, "-Wno-long-long"))
628 else if (!strcmp (p, "-Wwrite-strings"))
629 flag_const_strings = 1;
630 else if (!strcmp (p, "-Wno-write-strings"))
631 flag_const_strings = 0;
632 else if (!strcmp (p, "-Wcast-qual"))
634 else if (!strcmp (p, "-Wno-cast-qual"))
636 else if (!strcmp (p, "-Wbad-function-cast"))
637 warn_bad_function_cast = 1;
638 else if (!strcmp (p, "-Wno-bad-function-cast"))
639 warn_bad_function_cast = 0;
640 else if (!strcmp (p, "-Wno-missing-noreturn"))
641 warn_missing_noreturn = 0;
642 else if (!strcmp (p, "-Wmissing-format-attribute"))
643 warn_missing_format_attribute = 1;
644 else if (!strcmp (p, "-Wno-missing-format-attribute"))
645 warn_missing_format_attribute = 0;
646 else if (!strcmp (p, "-Wpointer-arith"))
647 warn_pointer_arith = 1;
648 else if (!strcmp (p, "-Wno-pointer-arith"))
649 warn_pointer_arith = 0;
650 else if (!strcmp (p, "-Wstrict-prototypes"))
651 warn_strict_prototypes = 1;
652 else if (!strcmp (p, "-Wno-strict-prototypes"))
653 warn_strict_prototypes = 0;
654 else if (!strcmp (p, "-Wmissing-prototypes"))
655 warn_missing_prototypes = 1;
656 else if (!strcmp (p, "-Wno-missing-prototypes"))
657 warn_missing_prototypes = 0;
658 else if (!strcmp (p, "-Wmissing-declarations"))
659 warn_missing_declarations = 1;
660 else if (!strcmp (p, "-Wno-missing-declarations"))
661 warn_missing_declarations = 0;
662 else if (!strcmp (p, "-Wredundant-decls"))
663 warn_redundant_decls = 1;
664 else if (!strcmp (p, "-Wno-redundant-decls"))
665 warn_redundant_decls = 0;
666 else if (!strcmp (p, "-Wnested-externs"))
667 warn_nested_externs = 1;
668 else if (!strcmp (p, "-Wno-nested-externs"))
669 warn_nested_externs = 0;
670 else if (!strcmp (p, "-Wtraditional"))
671 warn_traditional = 1;
672 else if (!strcmp (p, "-Wno-traditional"))
673 warn_traditional = 0;
674 else if (!strncmp (p, "-Wformat=", 9))
675 set_Wformat (atoi (p + 9));
676 else if (!strcmp (p, "-Wformat"))
678 else if (!strcmp (p, "-Wno-format"))
680 else if (!strcmp (p, "-Wformat-y2k"))
682 else if (!strcmp (p, "-Wno-format-y2k"))
684 else if (!strcmp (p, "-Wformat-extra-args"))
685 warn_format_extra_args = 1;
686 else if (!strcmp (p, "-Wno-format-extra-args"))
687 warn_format_extra_args = 0;
688 else if (!strcmp (p, "-Wformat-nonliteral"))
689 warn_format_nonliteral = 1;
690 else if (!strcmp (p, "-Wno-format-nonliteral"))
691 warn_format_nonliteral = 0;
692 else if (!strcmp (p, "-Wformat-security"))
693 warn_format_security = 1;
694 else if (!strcmp (p, "-Wno-format-security"))
695 warn_format_security = 0;
696 else if (!strcmp (p, "-Wchar-subscripts"))
697 warn_char_subscripts = 1;
698 else if (!strcmp (p, "-Wno-char-subscripts"))
699 warn_char_subscripts = 0;
700 else if (!strcmp (p, "-Wconversion"))
702 else if (!strcmp (p, "-Wno-conversion"))
704 else if (!strcmp (p, "-Wparentheses"))
705 warn_parentheses = 1;
706 else if (!strcmp (p, "-Wno-parentheses"))
707 warn_parentheses = 0;
708 else if (!strcmp (p, "-Wreturn-type"))
709 warn_return_type = 1;
710 else if (!strcmp (p, "-Wno-return-type"))
711 warn_return_type = 0;
712 else if (!strcmp (p, "-Wsequence-point"))
713 warn_sequence_point = 1;
714 else if (!strcmp (p, "-Wno-sequence-point"))
715 warn_sequence_point = 0;
716 else if (!strcmp (p, "-Wcomment"))
717 ; /* cpp handles this one. */
718 else if (!strcmp (p, "-Wno-comment"))
719 ; /* cpp handles this one. */
720 else if (!strcmp (p, "-Wcomments"))
721 ; /* cpp handles this one. */
722 else if (!strcmp (p, "-Wno-comments"))
723 ; /* cpp handles this one. */
724 else if (!strcmp (p, "-Wtrigraphs"))
725 ; /* cpp handles this one. */
726 else if (!strcmp (p, "-Wno-trigraphs"))
727 ; /* cpp handles this one. */
728 else if (!strcmp (p, "-Wundef"))
729 ; /* cpp handles this one. */
730 else if (!strcmp (p, "-Wno-undef"))
731 ; /* cpp handles this one. */
732 else if (!strcmp (p, "-Wimport"))
733 ; /* cpp handles this one. */
734 else if (!strcmp (p, "-Wno-import"))
735 ; /* cpp handles this one. */
736 else if (!strcmp (p, "-Wmissing-braces"))
737 warn_missing_braces = 1;
738 else if (!strcmp (p, "-Wno-missing-braces"))
739 warn_missing_braces = 0;
740 else if (!strcmp (p, "-Wmain"))
742 else if (!strcmp (p, "-Wno-main"))
744 else if (!strcmp (p, "-Wsign-compare"))
745 warn_sign_compare = 1;
746 else if (!strcmp (p, "-Wno-sign-compare"))
747 warn_sign_compare = 0;
748 else if (!strcmp (p, "-Wfloat-equal"))
749 warn_float_equal = 1;
750 else if (!strcmp (p, "-Wno-float-equal"))
751 warn_float_equal = 0;
752 else if (!strcmp (p, "-Wmultichar"))
754 else if (!strcmp (p, "-Wno-multichar"))
756 else if (!strcmp (p, "-Wdiv-by-zero"))
757 warn_div_by_zero = 1;
758 else if (!strcmp (p, "-Wno-div-by-zero"))
759 warn_div_by_zero = 0;
760 else if (!strcmp (p, "-Wunknown-pragmas"))
761 /* Set to greater than 1, so that even unknown pragmas in system
762 headers will be warned about. */
763 warn_unknown_pragmas = 2;
764 else if (!strcmp (p, "-Wno-unknown-pragmas"))
765 warn_unknown_pragmas = 0;
766 else if (!strcmp (p, "-Wall"))
768 /* We save the value of warn_uninitialized, since if they put
769 -Wuninitialized on the command line, we need to generate a
770 warning about not using it without also specifying -O. */
771 if (warn_uninitialized != 1)
772 warn_uninitialized = 2;
773 warn_implicit_int = 1;
774 mesg_implicit_function_declaration = 1;
775 warn_return_type = 1;
779 warn_char_subscripts = 1;
780 warn_parentheses = 1;
781 warn_sequence_point = 1;
782 warn_missing_braces = 1;
783 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
784 it off only if it's not explicit. */
786 /* Only warn about unknown pragmas that are not in system headers. */
787 warn_unknown_pragmas = 1;
790 return strings_processed;
796 c_print_identifier (file, node, indent)
801 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
802 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
803 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
804 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
805 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
806 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
807 if (C_IS_RESERVED_WORD (node))
809 tree rid = ridpointers[C_RID_CODE (node)];
810 indent_to (file, indent + 4);
811 fprintf (file, "rid ");
812 fprintf (file, HOST_PTR_PRINTF, (void *)rid);
813 fprintf (file, " \"%s\"", IDENTIFIER_POINTER (rid));
817 /* Hook called at end of compilation to assume 1 elt
818 for a top-level tentative array defn that wasn't complete before. */
821 finish_incomplete_decl (decl)
824 if (TREE_CODE (decl) == VAR_DECL)
826 tree type = TREE_TYPE (decl);
827 if (type != error_mark_node
828 && TREE_CODE (type) == ARRAY_TYPE
829 && ! DECL_EXTERNAL (decl)
830 && TYPE_DOMAIN (type) == 0)
832 warning_with_decl (decl, "array `%s' assumed to have one element");
834 complete_array_type (type, NULL_TREE, 1);
836 layout_decl (decl, 0);
841 /* Create a new `struct binding_level'. */
843 static struct binding_level *
844 make_binding_level ()
847 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
850 /* Nonzero if we are currently in the global binding level. */
855 return current_binding_level == global_binding_level;
861 keep_next_level_flag = 1;
864 /* Nonzero if the current level needs to have a BLOCK made. */
869 return ((current_binding_level->keep_if_subblocks
870 && current_binding_level->blocks != 0)
871 || current_binding_level->keep
872 || current_binding_level->names != 0
873 || (current_binding_level->tags != 0
874 && !current_binding_level->tag_transparent));
877 /* Identify this binding level as a level of parameters.
878 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
879 But it turns out there is no way to pass the right value for
880 DEFINITION_FLAG, so we ignore it. */
883 declare_parm_level (definition_flag)
884 int definition_flag ATTRIBUTE_UNUSED;
886 current_binding_level->parm_flag = 1;
889 /* Nonzero if currently making parm declarations. */
894 return current_binding_level->parm_flag;
897 /* Enter a new binding level.
898 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
899 not for that of tags. */
902 pushlevel (tag_transparent)
905 struct binding_level *newlevel = NULL_BINDING_LEVEL;
907 /* If this is the top level of a function,
908 just make sure that NAMED_LABELS is 0. */
910 if (current_binding_level == global_binding_level)
915 /* Reuse or create a struct for this binding level. */
917 if (free_binding_level)
919 newlevel = free_binding_level;
920 free_binding_level = free_binding_level->level_chain;
924 newlevel = make_binding_level ();
927 /* Add this level to the front of the chain (stack) of levels that
930 *newlevel = clear_binding_level;
931 newlevel->tag_transparent
933 || (current_binding_level
934 ? current_binding_level->subblocks_tag_transparent
936 newlevel->level_chain = current_binding_level;
937 current_binding_level = newlevel;
938 newlevel->keep = keep_next_level_flag;
939 keep_next_level_flag = 0;
940 newlevel->keep_if_subblocks = keep_next_if_subblocks;
941 keep_next_if_subblocks = 0;
944 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
947 clear_limbo_values (block)
952 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
953 if (DECL_NAME (tem) != 0)
954 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
956 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
957 clear_limbo_values (tem);
960 /* Exit a binding level.
961 Pop the level off, and restore the state of the identifier-decl mappings
962 that were in effect when this level was entered.
964 If KEEP is nonzero, this level had explicit declarations, so
965 and create a "block" (a BLOCK node) for the level
966 to record its declarations and subblocks for symbol table output.
968 If FUNCTIONBODY is nonzero, this level is the body of a function,
969 so create a block as if KEEP were set and also clear out all
972 If REVERSE is nonzero, reverse the order of decls before putting
973 them into the BLOCK. */
976 poplevel (keep, reverse, functionbody)
982 /* The chain of decls was accumulated in reverse order.
983 Put it into forward order, just for cleanliness. */
985 tree tags = current_binding_level->tags;
986 tree subblocks = current_binding_level->blocks;
989 int block_previously_created;
991 keep |= current_binding_level->keep;
993 /* This warning is turned off because it causes warnings for
994 declarations like `extern struct foo *x'. */
996 /* Warn about incomplete structure types in this level. */
997 for (link = tags; link; link = TREE_CHAIN (link))
998 if (!COMPLETE_TYPE_P (TREE_VALUE (link)))
1000 tree type = TREE_VALUE (link);
1001 tree type_name = TYPE_NAME (type);
1002 char *id = IDENTIFIER_POINTER (TREE_CODE (type_name) == IDENTIFIER_NODE
1004 : DECL_NAME (type_name));
1005 switch (TREE_CODE (type))
1008 error ("`struct %s' incomplete in scope ending here", id);
1011 error ("`union %s' incomplete in scope ending here", id);
1014 error ("`enum %s' incomplete in scope ending here", id);
1020 /* Get the decls in the order they were written.
1021 Usually current_binding_level->names is in reverse order.
1022 But parameter decls were previously put in forward order. */
1025 current_binding_level->names
1026 = decls = nreverse (current_binding_level->names);
1028 decls = current_binding_level->names;
1030 /* Output any nested inline functions within this block
1031 if they weren't already output. */
1033 for (decl = decls; decl; decl = TREE_CHAIN (decl))
1034 if (TREE_CODE (decl) == FUNCTION_DECL
1035 && ! TREE_ASM_WRITTEN (decl)
1036 && DECL_INITIAL (decl) != 0
1037 && TREE_ADDRESSABLE (decl))
1039 /* If this decl was copied from a file-scope decl
1040 on account of a block-scope extern decl,
1041 propagate TREE_ADDRESSABLE to the file-scope decl.
1043 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1044 true, since then the decl goes through save_for_inline_copying. */
1045 if (DECL_ABSTRACT_ORIGIN (decl) != 0
1046 && DECL_ABSTRACT_ORIGIN (decl) != decl)
1047 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
1050 /* We used to warn about unused variables in expand_end_bindings,
1051 i.e. while generating RTL. But in function-at-a-time mode we may
1052 choose to never expand a function at all (e.g. auto inlining), so
1053 we do this explicitly now. */
1054 warn_about_unused_variables (getdecls ());
1056 /* If there were any declarations or structure tags in that level,
1057 or if this level is a function body,
1058 create a BLOCK to record them for the life of this function. */
1061 block_previously_created = (current_binding_level->this_block != 0);
1062 if (block_previously_created)
1063 block = current_binding_level->this_block;
1064 else if (keep || functionbody
1065 || (current_binding_level->keep_if_subblocks && subblocks != 0))
1066 block = make_node (BLOCK);
1069 BLOCK_VARS (block) = decls;
1070 BLOCK_SUBBLOCKS (block) = subblocks;
1073 /* In each subblock, record that this is its superior. */
1075 for (link = subblocks; link; link = TREE_CHAIN (link))
1076 BLOCK_SUPERCONTEXT (link) = block;
1078 /* Clear out the meanings of the local variables of this level. */
1080 for (link = decls; link; link = TREE_CHAIN (link))
1082 if (DECL_NAME (link) != 0)
1084 /* If the ident. was used or addressed via a local extern decl,
1085 don't forget that fact. */
1086 if (DECL_EXTERNAL (link))
1088 if (TREE_USED (link))
1089 TREE_USED (DECL_NAME (link)) = 1;
1090 if (TREE_ADDRESSABLE (link))
1091 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1093 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1097 /* Restore all name-meanings of the outer levels
1098 that were shadowed by this level. */
1100 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1101 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1103 /* If the level being exited is the top level of a function,
1104 check over all the labels, and clear out the current
1105 (function local) meanings of their names. */
1109 clear_limbo_values (block);
1111 /* If this is the top level block of a function,
1112 the vars are the function's parameters.
1113 Don't leave them in the BLOCK because they are
1114 found in the FUNCTION_DECL instead. */
1116 BLOCK_VARS (block) = 0;
1118 /* Clear out the definitions of all label names,
1119 since their scopes end here,
1120 and add them to BLOCK_VARS. */
1122 for (link = named_labels; link; link = TREE_CHAIN (link))
1124 tree label = TREE_VALUE (link);
1126 if (DECL_INITIAL (label) == 0)
1128 error_with_decl (label, "label `%s' used but not defined");
1129 /* Avoid crashing later. */
1130 define_label (input_filename, lineno,
1133 else if (warn_unused_label && !TREE_USED (label))
1134 warning_with_decl (label, "label `%s' defined but not used");
1135 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1137 /* Put the labels into the "variables" of the
1138 top-level block, so debugger can see them. */
1139 TREE_CHAIN (label) = BLOCK_VARS (block);
1140 BLOCK_VARS (block) = label;
1144 /* Pop the current level, and free the structure for reuse. */
1147 struct binding_level *level = current_binding_level;
1148 current_binding_level = current_binding_level->level_chain;
1150 level->level_chain = free_binding_level;
1151 free_binding_level = level;
1154 /* Dispose of the block that we just made inside some higher level. */
1156 DECL_INITIAL (current_function_decl) = block;
1159 if (!block_previously_created)
1160 current_binding_level->blocks
1161 = chainon (current_binding_level->blocks, block);
1163 /* If we did not make a block for the level just exited,
1164 any blocks made for inner levels
1165 (since they cannot be recorded as subblocks in that level)
1166 must be carried forward so they will later become subblocks
1167 of something else. */
1169 current_binding_level->blocks
1170 = chainon (current_binding_level->blocks, subblocks);
1172 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1173 binding contour so that they point to the appropriate construct, i.e.
1174 either to the current FUNCTION_DECL node, or else to the BLOCK node
1175 we just constructed.
1177 Note that for tagged types whose scope is just the formal parameter
1178 list for some function type specification, we can't properly set
1179 their TYPE_CONTEXTs here, because we don't have a pointer to the
1180 appropriate FUNCTION_TYPE node readily available to us. For those
1181 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1182 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1183 node which will represent the "scope" for these "parameter list local"
1187 for (link = tags; link; link = TREE_CHAIN (link))
1188 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1190 for (link = tags; link; link = TREE_CHAIN (link))
1191 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1194 TREE_USED (block) = 1;
1199 /* Insert BLOCK at the end of the list of subblocks of the
1200 current binding level. This is used when a BIND_EXPR is expanded,
1201 to handle the BLOCK node inside the BIND_EXPR. */
1204 insert_block (block)
1207 TREE_USED (block) = 1;
1208 current_binding_level->blocks
1209 = chainon (current_binding_level->blocks, block);
1212 /* Set the BLOCK node for the innermost scope
1213 (the one we are currently in). */
1219 current_binding_level->this_block = block;
1220 current_binding_level->names = chainon (current_binding_level->names,
1221 BLOCK_VARS (block));
1222 current_binding_level->blocks = chainon (current_binding_level->blocks,
1223 BLOCK_SUBBLOCKS (block));
1229 struct binding_level *newlevel;
1231 /* Reuse or create a struct for this binding level. */
1233 if (free_binding_level)
1235 newlevel = free_binding_level;
1236 free_binding_level = free_binding_level->level_chain;
1240 newlevel = make_binding_level ();
1243 /* Add this level to the front of the chain (stack) of label levels. */
1245 newlevel->level_chain = label_level_chain;
1246 label_level_chain = newlevel;
1248 newlevel->names = named_labels;
1249 newlevel->shadowed = shadowed_labels;
1251 shadowed_labels = 0;
1257 struct binding_level *level = label_level_chain;
1260 /* Clear out the definitions of the declared labels in this level.
1261 Leave in the list any ordinary, non-declared labels. */
1262 for (link = named_labels, prev = 0; link;)
1264 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1266 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1268 error_with_decl (TREE_VALUE (link),
1269 "label `%s' used but not defined");
1270 /* Avoid crashing later. */
1271 define_label (input_filename, lineno,
1272 DECL_NAME (TREE_VALUE (link)));
1274 else if (warn_unused_label && !TREE_USED (TREE_VALUE (link)))
1275 warning_with_decl (TREE_VALUE (link),
1276 "label `%s' defined but not used");
1277 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1279 /* Delete this element from the list. */
1280 link = TREE_CHAIN (link);
1282 TREE_CHAIN (prev) = link;
1284 named_labels = link;
1289 link = TREE_CHAIN (link);
1293 /* Bring back all the labels that were shadowed. */
1294 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1295 if (DECL_NAME (TREE_VALUE (link)) != 0)
1296 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1297 = TREE_VALUE (link);
1299 named_labels = chainon (named_labels, level->names);
1300 shadowed_labels = level->shadowed;
1302 /* Pop the current level, and free the structure for reuse. */
1303 label_level_chain = label_level_chain->level_chain;
1304 level->level_chain = free_binding_level;
1305 free_binding_level = level;
1308 /* Push a definition or a declaration of struct, union or enum tag "name".
1309 "type" should be the type node.
1310 We assume that the tag "name" is not already defined.
1312 Note that the definition may really be just a forward reference.
1313 In that case, the TYPE_SIZE will be zero. */
1316 pushtag (name, type)
1319 struct binding_level *b;
1321 /* Find the proper binding level for this type tag. */
1323 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1328 /* Record the identifier as the type's name if it has none. */
1330 if (TYPE_NAME (type) == 0)
1331 TYPE_NAME (type) = name;
1334 b->tags = tree_cons (name, type, b->tags);
1336 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1337 tagged type we just added to the current binding level. This fake
1338 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1339 to output a representation of a tagged type, and it also gives
1340 us a convenient place to record the "scope start" address for the
1343 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1345 /* An approximation for now, so we can tell this is a function-scope tag.
1346 This will be updated in poplevel. */
1347 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1350 /* Handle when a new declaration NEWDECL
1351 has the same name as an old one OLDDECL
1352 in the same binding contour.
1353 Prints an error message if appropriate.
1355 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1356 Otherwise, return 0.
1358 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1359 and OLDDECL is in an outer binding level and should thus not be changed. */
1362 duplicate_decls (newdecl, olddecl, different_binding_level)
1363 tree newdecl, olddecl;
1364 int different_binding_level;
1366 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1367 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1368 && DECL_INITIAL (newdecl) != 0);
1369 tree oldtype = TREE_TYPE (olddecl);
1370 tree newtype = TREE_TYPE (newdecl);
1373 if (DECL_P (olddecl))
1375 if (TREE_CODE (newdecl) == FUNCTION_DECL
1376 && TREE_CODE (olddecl) == FUNCTION_DECL
1377 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1379 if (DECL_DECLARED_INLINE_P (newdecl)
1380 && DECL_UNINLINABLE (newdecl)
1381 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1382 /* Already warned elsewhere. */;
1383 else if (DECL_DECLARED_INLINE_P (olddecl)
1384 && DECL_UNINLINABLE (olddecl)
1385 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1386 /* Already warned. */;
1387 else if (DECL_DECLARED_INLINE_P (newdecl)
1388 && ! DECL_DECLARED_INLINE_P (olddecl)
1389 && DECL_UNINLINABLE (olddecl)
1390 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1392 warning_with_decl (newdecl,
1393 "function `%s' redeclared as inline");
1394 warning_with_decl (olddecl,
1395 "previous declaration of function `%s' with attribute noinline");
1397 else if (DECL_DECLARED_INLINE_P (olddecl)
1398 && DECL_UNINLINABLE (newdecl)
1399 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1401 warning_with_decl (newdecl,
1402 "function `%s' redeclared with attribute noinline");
1403 warning_with_decl (olddecl,
1404 "previous declaration of function `%s' was inline");
1408 DECL_ATTRIBUTES (newdecl)
1409 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1412 if (TREE_CODE (newtype) == ERROR_MARK
1413 || TREE_CODE (oldtype) == ERROR_MARK)
1416 /* New decl is completely inconsistent with the old one =>
1417 tell caller to replace the old one.
1418 This is always an error except in the case of shadowing a builtin. */
1419 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1421 if (TREE_CODE (olddecl) == FUNCTION_DECL
1422 && (DECL_BUILT_IN (olddecl)
1423 || DECL_BUILT_IN_NONANSI (olddecl)))
1425 /* If you declare a built-in or predefined function name as static,
1426 the old definition is overridden,
1427 but optionally warn this was a bad choice of name. */
1428 if (!TREE_PUBLIC (newdecl))
1432 else if (DECL_BUILT_IN (olddecl))
1433 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1435 warning_with_decl (newdecl, "shadowing library function `%s'");
1437 /* Likewise, if the built-in is not ansi, then programs can
1438 override it even globally without an error. */
1439 else if (! DECL_BUILT_IN (olddecl))
1440 warning_with_decl (newdecl,
1441 "library function `%s' declared as non-function");
1443 else if (DECL_BUILT_IN_NONANSI (olddecl))
1444 warning_with_decl (newdecl,
1445 "built-in function `%s' declared as non-function");
1447 warning_with_decl (newdecl,
1448 "built-in function `%s' declared as non-function");
1452 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1453 error_with_decl (olddecl, "previous declaration of `%s'");
1459 /* For real parm decl following a forward decl,
1460 return 1 so old decl will be reused. */
1461 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1462 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1465 /* The new declaration is the same kind of object as the old one.
1466 The declarations may partially match. Print warnings if they don't
1467 match enough. Ultimately, copy most of the information from the new
1468 decl to the old one, and keep using the old one. */
1470 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1471 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1472 && DECL_INITIAL (olddecl) == 0)
1473 /* If -traditional, avoid error for redeclaring fcn
1474 after implicit decl. */
1476 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1477 && DECL_BUILT_IN (olddecl))
1479 /* A function declaration for a built-in function. */
1480 if (!TREE_PUBLIC (newdecl))
1482 /* If you declare a built-in function name as static, the
1483 built-in definition is overridden,
1484 but optionally warn this was a bad choice of name. */
1486 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1487 /* Discard the old built-in function. */
1490 else if (!types_match)
1492 /* Accept the return type of the new declaration if same modes. */
1493 tree oldreturntype = TREE_TYPE (oldtype);
1494 tree newreturntype = TREE_TYPE (newtype);
1496 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1498 /* Function types may be shared, so we can't just modify
1499 the return type of olddecl's function type. */
1501 = build_function_type (newreturntype,
1502 TYPE_ARG_TYPES (oldtype));
1503 trytype = build_type_attribute_variant (trytype,
1504 TYPE_ATTRIBUTES (oldtype));
1506 types_match = comptypes (newtype, trytype);
1510 /* Accept harmless mismatch in first argument type also.
1511 This is for the ffs and fprintf builtins. */
1512 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1513 && TYPE_ARG_TYPES (oldtype) != 0
1514 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1515 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1516 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1517 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1519 /* Function types may be shared, so we can't just modify
1520 the return type of olddecl's function type. */
1522 = build_function_type (TREE_TYPE (oldtype),
1523 tree_cons (NULL_TREE,
1524 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1525 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1526 trytype = build_type_attribute_variant (trytype,
1527 TYPE_ATTRIBUTES (oldtype));
1529 types_match = comptypes (newtype, trytype);
1533 if (! different_binding_level)
1534 TREE_TYPE (olddecl) = oldtype;
1538 /* If types don't match for a built-in, throw away the built-in. */
1539 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1543 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1544 && DECL_SOURCE_LINE (olddecl) == 0)
1546 /* A function declaration for a predeclared function
1547 that isn't actually built in. */
1548 if (!TREE_PUBLIC (newdecl))
1550 /* If you declare it as static, the
1551 default definition is overridden. */
1554 else if (!types_match)
1556 /* If the types don't match, preserve volatility indication.
1557 Later on, we will discard everything else about the
1558 default declaration. */
1559 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1562 /* Permit char *foo () to match void *foo (...) if not pedantic,
1563 if one of them came from a system header file. */
1564 else if (!types_match
1565 && TREE_CODE (olddecl) == FUNCTION_DECL
1566 && TREE_CODE (newdecl) == FUNCTION_DECL
1567 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1568 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1569 && (DECL_IN_SYSTEM_HEADER (olddecl)
1570 || DECL_IN_SYSTEM_HEADER (newdecl))
1571 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1572 && TYPE_ARG_TYPES (oldtype) == 0
1573 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1574 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1576 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1577 && TYPE_ARG_TYPES (newtype) == 0
1578 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1579 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1582 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1583 /* Make sure we keep void * as ret type, not char *. */
1584 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1585 TREE_TYPE (newdecl) = newtype = oldtype;
1587 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1588 we will come back here again. */
1589 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1591 else if (!types_match
1592 /* Permit char *foo (int, ...); followed by char *foo ();
1594 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1596 /* Return types must still match. */
1597 && comptypes (TREE_TYPE (oldtype),
1598 TREE_TYPE (newtype))
1599 && TYPE_ARG_TYPES (newtype) == 0))
1601 error_with_decl (newdecl, "conflicting types for `%s'");
1602 /* Check for function type mismatch
1603 involving an empty arglist vs a nonempty one. */
1604 if (TREE_CODE (olddecl) == FUNCTION_DECL
1605 && comptypes (TREE_TYPE (oldtype),
1606 TREE_TYPE (newtype))
1607 && ((TYPE_ARG_TYPES (oldtype) == 0
1608 && DECL_INITIAL (olddecl) == 0)
1610 (TYPE_ARG_TYPES (newtype) == 0
1611 && DECL_INITIAL (newdecl) == 0)))
1613 /* Classify the problem further. */
1614 tree t = TYPE_ARG_TYPES (oldtype);
1616 t = TYPE_ARG_TYPES (newtype);
1617 for (; t; t = TREE_CHAIN (t))
1619 tree type = TREE_VALUE (t);
1621 if (TREE_CHAIN (t) == 0
1622 && TYPE_MAIN_VARIANT (type) != void_type_node)
1624 error ("a parameter list with an ellipsis can't match an empty parameter name list declaration");
1628 if (simple_type_promotes_to (type) != NULL_TREE)
1630 error ("an argument type that has a default promotion can't match an empty parameter name list declaration");
1635 error_with_decl (olddecl, "previous declaration of `%s'");
1639 errmsg = redeclaration_error_message (newdecl, olddecl);
1645 error_with_decl (newdecl, "redefinition of `%s'");
1648 error_with_decl (newdecl, "redeclaration of `%s'");
1651 error_with_decl (newdecl, "conflicting declarations of `%s'");
1657 error_with_decl (olddecl,
1658 ((DECL_INITIAL (olddecl)
1659 && current_binding_level == global_binding_level)
1660 ? "`%s' previously defined here"
1661 : "`%s' previously declared here"));
1663 else if (TREE_CODE (newdecl) == TYPE_DECL
1664 && (DECL_IN_SYSTEM_HEADER (olddecl)
1665 || DECL_IN_SYSTEM_HEADER (newdecl)))
1667 warning_with_decl (newdecl, "redefinition of `%s'");
1670 ((DECL_INITIAL (olddecl)
1671 && current_binding_level == global_binding_level)
1672 ? "`%s' previously defined here"
1673 : "`%s' previously declared here"));
1675 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1676 && DECL_INITIAL (olddecl) != 0
1677 && TYPE_ARG_TYPES (oldtype) == 0
1678 && TYPE_ARG_TYPES (newtype) != 0
1679 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1683 /* Prototype decl follows defn w/o prototype. */
1685 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1686 type = TYPE_ARG_TYPES (newtype),
1689 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1691 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1692 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1694 warning_with_decl (newdecl, "prototype for `%s' follows");
1695 warning_with_decl (olddecl, "non-prototype definition here");
1698 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1699 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1701 error_with_decl (newdecl,
1702 "prototype for `%s' follows and number of arguments doesn't match");
1703 error_with_decl (olddecl, "non-prototype definition here");
1707 /* Type for passing arg must be consistent
1708 with that declared for the arg. */
1709 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1710 /* If -traditional, allow `unsigned int' instead of `int'
1711 in the prototype. */
1712 && (! (flag_traditional
1713 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1714 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1716 error_with_decl (newdecl,
1717 "prototype for `%s' follows and argument %d doesn't match",
1719 error_with_decl (olddecl, "non-prototype definition here");
1725 /* Warn about mismatches in various flags. */
1728 /* Warn if function is now inline
1729 but was previously declared not inline and has been called. */
1730 if (TREE_CODE (olddecl) == FUNCTION_DECL
1731 && ! DECL_DECLARED_INLINE_P (olddecl)
1732 && DECL_DECLARED_INLINE_P (newdecl)
1733 && TREE_USED (olddecl))
1734 warning_with_decl (newdecl,
1735 "`%s' declared inline after being called");
1736 if (TREE_CODE (olddecl) == FUNCTION_DECL
1737 && ! DECL_DECLARED_INLINE_P (olddecl)
1738 && DECL_DECLARED_INLINE_P (newdecl)
1739 && DECL_INITIAL (olddecl) != 0)
1740 warning_with_decl (newdecl,
1741 "`%s' declared inline after its definition");
1743 /* If pedantic, warn when static declaration follows a non-static
1744 declaration. Otherwise, do so only for functions. */
1745 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1746 && TREE_PUBLIC (olddecl)
1747 && !TREE_PUBLIC (newdecl))
1748 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1750 /* If warn_traditional, warn when a non-static function
1751 declaration follows a static one. */
1752 if (warn_traditional && !in_system_header
1753 && TREE_CODE (olddecl) == FUNCTION_DECL
1754 && !TREE_PUBLIC (olddecl)
1755 && TREE_PUBLIC (newdecl))
1756 warning_with_decl (newdecl, "non-static declaration for `%s' follows static");
1758 /* Warn when const declaration follows a non-const
1759 declaration, but not for functions. */
1760 if (TREE_CODE (olddecl) != FUNCTION_DECL
1761 && !TREE_READONLY (olddecl)
1762 && TREE_READONLY (newdecl))
1763 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1764 /* These bits are logically part of the type, for variables.
1765 But not for functions
1766 (where qualifiers are not valid ANSI anyway). */
1767 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1768 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1769 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1770 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1774 /* Optionally warn about more than one declaration for the same name. */
1775 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1776 /* Don't warn about a function declaration
1777 followed by a definition. */
1778 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1779 && DECL_INITIAL (olddecl) == 0)
1780 /* Don't warn about extern decl followed by (tentative) definition. */
1781 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1783 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1784 warning_with_decl (olddecl, "previous declaration of `%s'");
1787 /* Copy all the DECL_... slots specified in the new decl
1788 except for any that we copy here from the old type.
1790 Past this point, we don't change OLDTYPE and NEWTYPE
1791 even if we change the types of NEWDECL and OLDDECL. */
1795 /* When copying info to olddecl, we store into write_olddecl
1796 instead. This allows us to avoid modifying olddecl when
1797 different_binding_level is true. */
1798 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1800 /* Merge the data types specified in the two decls. */
1801 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1803 if (different_binding_level)
1805 if (TYPE_ARG_TYPES (oldtype) != 0
1806 && TYPE_ARG_TYPES (newtype) == 0)
1807 TREE_TYPE (newdecl) = common_type (newtype, oldtype);
1810 = build_type_attribute_variant
1812 merge_attributes (TYPE_ATTRIBUTES (newtype),
1813 TYPE_ATTRIBUTES (oldtype)));
1817 = TREE_TYPE (olddecl)
1818 = common_type (newtype, oldtype);
1821 /* Lay the type out, unless already done. */
1822 if (oldtype != TREE_TYPE (newdecl))
1824 if (TREE_TYPE (newdecl) != error_mark_node)
1825 layout_type (TREE_TYPE (newdecl));
1826 if (TREE_CODE (newdecl) != FUNCTION_DECL
1827 && TREE_CODE (newdecl) != TYPE_DECL
1828 && TREE_CODE (newdecl) != CONST_DECL)
1829 layout_decl (newdecl, 0);
1833 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1834 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1835 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1836 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1837 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1838 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1840 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1841 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1845 /* Keep the old rtl since we can safely use it. */
1846 COPY_DECL_RTL (olddecl, newdecl);
1848 /* Merge the type qualifiers. */
1849 if (TREE_CODE (olddecl) == FUNCTION_DECL
1850 && DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1851 && ! TREE_THIS_VOLATILE (newdecl))
1852 TREE_THIS_VOLATILE (write_olddecl) = 0;
1854 if (TREE_READONLY (newdecl))
1855 TREE_READONLY (write_olddecl) = 1;
1857 if (TREE_THIS_VOLATILE (newdecl))
1859 TREE_THIS_VOLATILE (write_olddecl) = 1;
1860 if (TREE_CODE (newdecl) == VAR_DECL
1861 /* If an automatic variable is re-declared in the same
1862 function scope, but the old declaration was not
1863 volatile, make_var_volatile() would crash because the
1864 variable would have been assigned to a pseudo, not a
1865 MEM. Since this duplicate declaration is invalid
1866 anyway, we just skip the call. */
1868 make_var_volatile (newdecl);
1871 /* Keep source location of definition rather than declaration. */
1872 /* When called with different_binding_level set, keep the old
1873 information so that meaningful diagnostics can be given. */
1874 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1875 && ! different_binding_level)
1877 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1878 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1881 /* Merge the unused-warning information. */
1882 if (DECL_IN_SYSTEM_HEADER (olddecl))
1883 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1884 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1885 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1887 /* Merge the initialization information. */
1888 /* When called with different_binding_level set, don't copy over
1889 DECL_INITIAL, so that we don't accidentally change function
1890 declarations into function definitions. */
1891 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1892 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1894 /* Merge the section attribute.
1895 We want to issue an error if the sections conflict but that must be
1896 done later in decl_attributes since we are called before attributes
1898 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1899 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1901 /* Copy the assembler name.
1902 Currently, it can only be defined in the prototype. */
1903 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1905 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1907 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1908 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1910 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1911 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1912 DECL_NO_CHECK_MEMORY_USAGE (newdecl)
1913 |= DECL_NO_CHECK_MEMORY_USAGE (olddecl);
1914 DECL_NO_LIMIT_STACK (newdecl)
1915 |= DECL_NO_LIMIT_STACK (olddecl);
1918 /* If cannot merge, then use the new type and qualifiers,
1919 and don't preserve the old rtl. */
1920 else if (! different_binding_level)
1922 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1923 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1924 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1925 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1928 /* Merge the storage class information. */
1929 DECL_WEAK (newdecl) |= DECL_WEAK (olddecl);
1930 /* For functions, static overrides non-static. */
1931 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1933 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1934 /* This is since we don't automatically
1935 copy the attributes of NEWDECL into OLDDECL. */
1936 /* No need to worry about different_binding_level here because
1937 then TREE_PUBLIC (newdecl) was true. */
1938 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1939 /* If this clears `static', clear it in the identifier too. */
1940 if (! TREE_PUBLIC (olddecl))
1941 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1943 if (DECL_EXTERNAL (newdecl))
1945 if (! different_binding_level)
1947 /* Don't mess with these flags on local externs; they remain
1948 external even if there's a declaration at file scope which
1950 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1951 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1953 /* An extern decl does not override previous storage class. */
1954 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1955 if (! DECL_EXTERNAL (newdecl))
1956 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1960 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1961 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1964 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1966 /* If we're redefining a function previously defined as extern
1967 inline, make sure we emit debug info for the inline before we
1968 throw it away, in case it was inlined into a function that hasn't
1969 been written out yet. */
1970 if (new_is_definition && DECL_INITIAL (olddecl) && TREE_USED (olddecl))
1972 (*debug_hooks->outlining_inline_function) (olddecl);
1974 /* The new defn must not be inline. */
1975 DECL_INLINE (newdecl) = 0;
1976 DECL_UNINLINABLE (newdecl) = 1;
1980 /* If either decl says `inline', this fn is inline,
1981 unless its definition was passed already. */
1982 if (DECL_DECLARED_INLINE_P (newdecl)
1983 && DECL_DECLARED_INLINE_P (olddecl) == 0)
1984 DECL_DECLARED_INLINE_P (olddecl) = 1;
1986 DECL_DECLARED_INLINE_P (newdecl) = DECL_DECLARED_INLINE_P (olddecl);
1988 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1989 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1992 if (DECL_BUILT_IN (olddecl))
1994 /* Get rid of any built-in function if new arg types don't match it
1995 or if we have a function definition. */
1996 if (! types_match || new_is_definition)
1998 if (! different_binding_level)
2000 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
2001 DECL_BUILT_IN_CLASS (olddecl) = NOT_BUILT_IN;
2006 /* If redeclaring a builtin function, and not a definition,
2007 it stays built in. */
2008 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2009 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2012 /* Also preserve various other info from the definition. */
2013 else if (! new_is_definition)
2014 DECL_NUM_STMTS (newdecl) = DECL_NUM_STMTS (olddecl);
2015 if (! new_is_definition)
2017 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2018 /* When called with different_binding_level set, don't copy over
2019 DECL_INITIAL, so that we don't accidentally change function
2020 declarations into function definitions. */
2021 if (! different_binding_level)
2023 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2024 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
2026 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
2027 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2028 if (DECL_INLINE (newdecl))
2029 DECL_ABSTRACT_ORIGIN (newdecl) = DECL_ABSTRACT_ORIGIN (olddecl);
2032 if (different_binding_level)
2035 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2036 But preserve OLDDECL's DECL_UID. */
2038 unsigned olddecl_uid = DECL_UID (olddecl);
2040 memcpy ((char *) olddecl + sizeof (struct tree_common),
2041 (char *) newdecl + sizeof (struct tree_common),
2042 sizeof (struct tree_decl) - sizeof (struct tree_common));
2043 DECL_UID (olddecl) = olddecl_uid;
2046 /* NEWDECL contains the merged attribute lists.
2047 Update OLDDECL to be the same. */
2048 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2053 /* Record a decl-node X as belonging to the current lexical scope.
2054 Check for errors (such as an incompatible declaration for the same
2055 name already seen in the same scope).
2057 Returns either X or an old decl for the same name.
2058 If an old decl is returned, it may have been smashed
2059 to agree with what X says. */
2066 tree name = DECL_NAME (x);
2067 struct binding_level *b = current_binding_level;
2069 /* Functions need the lang_decl data. */
2070 if (TREE_CODE (x) == FUNCTION_DECL && ! DECL_LANG_SPECIFIC (x))
2071 DECL_LANG_SPECIFIC (x) = (struct lang_decl *)
2072 ggc_alloc_cleared (sizeof (struct lang_decl));
2074 DECL_CONTEXT (x) = current_function_decl;
2075 /* A local extern declaration for a function doesn't constitute nesting.
2076 A local auto declaration does, since it's a forward decl
2077 for a nested function coming later. */
2078 if ((TREE_CODE (x) == FUNCTION_DECL || TREE_CODE (x) == VAR_DECL)
2079 && DECL_INITIAL (x) == 0 && DECL_EXTERNAL (x))
2080 DECL_CONTEXT (x) = 0;
2084 int different_binding_level = 0;
2086 if (warn_nested_externs
2087 && DECL_EXTERNAL (x)
2088 && b != global_binding_level
2089 && x != IDENTIFIER_IMPLICIT_DECL (name)
2090 /* No error messages for __FUNCTION__ and __PRETTY_FUNCTION__. */
2091 && !DECL_IN_SYSTEM_HEADER (x))
2092 warning ("nested extern declaration of `%s'",
2093 IDENTIFIER_POINTER (name));
2095 t = lookup_name_current_level (name);
2096 /* Don't type check externs here when -traditional. This is so that
2097 code with conflicting declarations inside blocks will get warnings
2098 not errors. X11 for instance depends on this. */
2099 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
2101 t = lookup_name (name);
2102 /* Type decls at global scope don't conflict with externs declared
2103 inside lexical blocks. */
2104 if (t && TREE_CODE (t) == TYPE_DECL)
2106 different_binding_level = 1;
2108 if (t != 0 && t == error_mark_node)
2109 /* error_mark_node is 0 for a while during initialization! */
2112 error_with_decl (x, "`%s' used prior to declaration");
2115 /* If this decl is `static' and an implicit decl was seen previously,
2116 warn. But don't complain if -traditional,
2117 since traditional compilers don't complain. */
2118 if (! flag_traditional && TREE_PUBLIC (name)
2119 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2120 sets this for all functions. */
2121 && ! TREE_PUBLIC (x)
2122 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2123 /* We used to warn also for explicit extern followed by static,
2124 but sometimes you need to do it that way. */
2125 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2127 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2128 IDENTIFIER_POINTER (name));
2129 pedwarn_with_file_and_line
2130 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2131 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2132 "previous declaration of `%s'",
2133 IDENTIFIER_POINTER (name));
2134 TREE_THIS_VOLATILE (name) = 1;
2137 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2139 if (TREE_CODE (t) == PARM_DECL)
2141 /* Don't allow more than one "real" duplicate
2142 of a forward parm decl. */
2143 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2149 /* If we are processing a typedef statement, generate a whole new
2150 ..._TYPE node (which will be just an variant of the existing
2151 ..._TYPE node with identical properties) and then install the
2152 TYPE_DECL node generated to represent the typedef name as the
2153 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2155 The whole point here is to end up with a situation where each
2156 and every ..._TYPE node the compiler creates will be uniquely
2157 associated with AT MOST one node representing a typedef name.
2158 This way, even though the compiler substitutes corresponding
2159 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2160 early on, later parts of the compiler can always do the reverse
2161 translation and get back the corresponding typedef name. For
2164 typedef struct S MY_TYPE;
2167 Later parts of the compiler might only know that `object' was of
2168 type `struct S' if it were not for code just below. With this
2169 code however, later parts of the compiler see something like:
2171 struct S' == struct S
2172 typedef struct S' MY_TYPE;
2175 And they can then deduce (from the node for type struct S') that
2176 the original object declaration was:
2180 Being able to do this is important for proper support of protoize,
2181 and also for generating precise symbolic debugging information
2182 which takes full account of the programmer's (typedef) vocabulary.
2184 Obviously, we don't want to generate a duplicate ..._TYPE node if
2185 the TYPE_DECL node that we are now processing really represents a
2186 standard built-in type.
2188 Since all standard types are effectively declared at line zero
2189 in the source file, we can easily check to see if we are working
2190 on a standard type by checking the current value of lineno. */
2192 if (TREE_CODE (x) == TYPE_DECL)
2194 if (DECL_SOURCE_LINE (x) == 0)
2196 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2197 TYPE_NAME (TREE_TYPE (x)) = x;
2199 else if (TREE_TYPE (x) != error_mark_node
2200 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2202 tree tt = TREE_TYPE (x);
2203 DECL_ORIGINAL_TYPE (x) = tt;
2204 tt = build_type_copy (tt);
2206 TREE_USED (tt) = TREE_USED (x);
2211 /* Multiple external decls of the same identifier ought to match.
2212 Check against both global declarations (when traditional) and out of
2213 scope (limbo) block level declarations.
2215 We get warnings about inline functions where they are defined.
2216 Avoid duplicate warnings where they are used. */
2218 && ! (TREE_CODE (x) == FUNCTION_DECL && DECL_INLINE (x)))
2222 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2223 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2224 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2225 decl = IDENTIFIER_GLOBAL_VALUE (name);
2226 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2227 /* Decls in limbo are always extern, so no need to check that. */
2228 decl = IDENTIFIER_LIMBO_VALUE (name);
2232 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2233 /* If old decl is built-in, we already warned if we should. */
2234 && !DECL_BUILT_IN (decl))
2236 pedwarn_with_decl (x,
2237 "type mismatch with previous external decl");
2238 pedwarn_with_decl (decl, "previous external decl of `%s'");
2242 /* If a function has had an implicit declaration, and then is defined,
2243 make sure they are compatible. */
2245 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2246 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2247 && TREE_CODE (x) == FUNCTION_DECL
2248 && ! comptypes (TREE_TYPE (x),
2249 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2251 warning_with_decl (x, "type mismatch with previous implicit declaration");
2252 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2253 "previous implicit declaration of `%s'");
2256 /* In PCC-compatibility mode, extern decls of vars with no current decl
2257 take effect at top level no matter where they are. */
2258 if (flag_traditional && DECL_EXTERNAL (x)
2259 && lookup_name (name) == 0)
2261 tree type = TREE_TYPE (x);
2263 /* But don't do this if the type contains temporary nodes. */
2266 if (type == error_mark_node)
2268 if (TYPE_CONTEXT (type))
2270 warning_with_decl (x, "type of external `%s' is not global");
2271 /* By exiting the loop early, we leave TYPE nonzero,
2272 and thus prevent globalization of the decl. */
2275 else if (TREE_CODE (type) == FUNCTION_TYPE
2276 && TYPE_ARG_TYPES (type) != 0)
2277 /* The types might not be truly local,
2278 but the list of arg types certainly is temporary.
2279 Since prototypes are nontraditional,
2280 ok not to do the traditional thing. */
2282 type = TREE_TYPE (type);
2286 b = global_binding_level;
2289 /* This name is new in its binding level.
2290 Install the new declaration and return it. */
2291 if (b == global_binding_level)
2293 /* Install a global value. */
2295 /* If the first global decl has external linkage,
2296 warn if we later see static one. */
2297 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2298 TREE_PUBLIC (name) = 1;
2300 IDENTIFIER_GLOBAL_VALUE (name) = x;
2302 /* We no longer care about any previous block level declarations. */
2303 IDENTIFIER_LIMBO_VALUE (name) = 0;
2305 /* Don't forget if the function was used via an implicit decl. */
2306 if (IDENTIFIER_IMPLICIT_DECL (name)
2307 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2308 TREE_USED (x) = 1, TREE_USED (name) = 1;
2310 /* Don't forget if its address was taken in that way. */
2311 if (IDENTIFIER_IMPLICIT_DECL (name)
2312 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2313 TREE_ADDRESSABLE (x) = 1;
2315 /* Warn about mismatches against previous implicit decl. */
2316 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2317 /* If this real decl matches the implicit, don't complain. */
2318 && ! (TREE_CODE (x) == FUNCTION_DECL
2319 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2320 == integer_type_node)))
2321 pedwarn ("`%s' was previously implicitly declared to return `int'",
2322 IDENTIFIER_POINTER (name));
2324 /* If this decl is `static' and an `extern' was seen previously,
2325 that is erroneous. */
2326 if (TREE_PUBLIC (name)
2327 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2329 /* Okay to redeclare an ANSI built-in as static. */
2330 if (t != 0 && DECL_BUILT_IN (t))
2332 /* Okay to declare a non-ANSI built-in as anything. */
2333 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2335 /* Okay to have global type decl after an earlier extern
2336 declaration inside a lexical block. */
2337 else if (TREE_CODE (x) == TYPE_DECL)
2339 else if (IDENTIFIER_IMPLICIT_DECL (name))
2341 if (! TREE_THIS_VOLATILE (name))
2342 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2343 IDENTIFIER_POINTER (name));
2346 pedwarn ("`%s' was declared `extern' and later `static'",
2347 IDENTIFIER_POINTER (name));
2352 /* Here to install a non-global value. */
2353 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2354 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2356 IDENTIFIER_LOCAL_VALUE (name) = x;
2358 /* If this is an extern function declaration, see if we
2359 have a global definition or declaration for the function. */
2362 && TREE_CODE (x) == FUNCTION_DECL
2363 && TREE_CODE (oldglobal) == FUNCTION_DECL
2364 && DECL_EXTERNAL (x)
2365 && ! DECL_DECLARED_INLINE_P (x))
2367 /* We have one. Their types must agree. */
2368 if (! comptypes (TREE_TYPE (x),
2369 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2370 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2373 /* Inner extern decl is inline if global one is.
2374 Copy enough to really inline it. */
2375 if (DECL_DECLARED_INLINE_P (oldglobal))
2377 DECL_DECLARED_INLINE_P (x)
2378 = DECL_DECLARED_INLINE_P (oldglobal);
2379 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2380 DECL_INITIAL (x) = (current_function_decl == oldglobal
2381 ? 0 : DECL_INITIAL (oldglobal));
2382 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2383 DECL_NUM_STMTS (x) = DECL_NUM_STMTS (oldglobal);
2384 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2385 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2386 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2387 DECL_ABSTRACT_ORIGIN (x)
2388 = DECL_ABSTRACT_ORIGIN (oldglobal);
2390 /* Inner extern decl is built-in if global one is. */
2391 if (DECL_BUILT_IN (oldglobal))
2393 DECL_BUILT_IN_CLASS (x) = DECL_BUILT_IN_CLASS (oldglobal);
2394 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2396 /* Keep the arg types from a file-scope fcn defn. */
2397 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2398 && DECL_INITIAL (oldglobal)
2399 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2400 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2405 /* This case is probably sometimes the right thing to do. */
2406 /* If we have a local external declaration,
2407 then any file-scope declaration should not
2408 have been static. */
2409 if (oldlocal == 0 && oldglobal != 0
2410 && !TREE_PUBLIC (oldglobal)
2411 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2412 warning ("`%s' locally external but globally static",
2413 IDENTIFIER_POINTER (name));
2416 /* If we have a local external declaration,
2417 and no file-scope declaration has yet been seen,
2418 then if we later have a file-scope decl it must not be static. */
2420 && DECL_EXTERNAL (x)
2424 TREE_PUBLIC (name) = 1;
2426 /* Save this decl, so that we can do type checking against
2427 other decls after it falls out of scope.
2429 Only save it once. This prevents temporary decls created in
2430 expand_inline_function from being used here, since this
2431 will have been set when the inline function was parsed.
2432 It also helps give slightly better warnings. */
2433 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2434 IDENTIFIER_LIMBO_VALUE (name) = x;
2437 /* Warn if shadowing an argument at the top level of the body. */
2438 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2439 /* This warning doesn't apply to the parms of a nested fcn. */
2440 && ! current_binding_level->parm_flag
2441 /* Check that this is one level down from the parms. */
2442 && current_binding_level->level_chain->parm_flag
2443 /* Check that the decl being shadowed
2444 comes from the parm level, one level up. */
2445 && chain_member (oldlocal, current_binding_level->level_chain->names))
2447 if (TREE_CODE (oldlocal) == PARM_DECL)
2448 pedwarn ("declaration of `%s' shadows a parameter",
2449 IDENTIFIER_POINTER (name));
2451 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2452 IDENTIFIER_POINTER (name));
2455 /* Maybe warn if shadowing something else. */
2456 else if (warn_shadow && !DECL_EXTERNAL (x)
2457 /* No shadow warnings for internally generated vars. */
2458 && DECL_SOURCE_LINE (x) != 0
2459 /* No shadow warnings for vars made for inlining. */
2460 && ! DECL_FROM_INLINE (x))
2462 const char *id = IDENTIFIER_POINTER (name);
2464 if (TREE_CODE (x) == PARM_DECL
2465 && current_binding_level->level_chain->parm_flag)
2466 /* Don't warn about the parm names in function declarator
2467 within a function declarator.
2468 It would be nice to avoid warning in any function
2469 declarator in a declaration, as opposed to a definition,
2470 but there is no way to tell it's not a definition. */
2472 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2473 warning ("declaration of `%s' shadows a parameter", id);
2474 else if (oldlocal != 0)
2475 warning ("declaration of `%s' shadows previous local", id);
2476 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2477 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2478 warning ("declaration of `%s' shadows global declaration", id);
2481 /* If storing a local value, there may already be one (inherited).
2482 If so, record it for restoration when this binding level ends. */
2484 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2487 /* Keep count of variables in this level with incomplete type.
2488 If the input is erroneous, we can have error_mark in the type
2489 slot (e.g. "f(void a, ...)") - that doesn't count as an
2491 if (TREE_TYPE (x) != error_mark_node
2492 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2496 /* Put decls on list in reverse order.
2497 We will reverse them later if necessary. */
2498 TREE_CHAIN (x) = b->names;
2504 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2507 pushdecl_top_level (x)
2511 struct binding_level *b = current_binding_level;
2513 current_binding_level = global_binding_level;
2515 current_binding_level = b;
2519 /* Generate an implicit declaration for identifier FUNCTIONID
2520 as a function of type int (). Print a warning if appropriate. */
2523 implicitly_declare (functionid)
2527 int traditional_warning = 0;
2528 /* Only one "implicit declaration" warning per identifier. */
2529 int implicit_warning;
2531 /* We used to reuse an old implicit decl here,
2532 but this loses with inline functions because it can clobber
2533 the saved decl chains. */
2535 if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2536 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2539 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2541 /* Warn of implicit decl following explicit local extern decl.
2542 This is probably a program designed for traditional C. */
2543 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2544 traditional_warning = 1;
2546 /* Warn once of an implicit declaration. */
2547 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2549 DECL_EXTERNAL (decl) = 1;
2550 TREE_PUBLIC (decl) = 1;
2552 /* Record that we have an implicit decl and this is it. */
2553 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2555 /* ANSI standard says implicit declarations are in the innermost block.
2556 So we record the decl in the standard fashion.
2557 If flag_traditional is set, pushdecl does it top-level. */
2560 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2561 maybe_objc_check_decl (decl);
2563 rest_of_decl_compilation (decl, NULL, 0, 0);
2565 if (implicit_warning)
2566 implicit_decl_warning (functionid);
2567 else if (warn_traditional && traditional_warning)
2568 warning ("function `%s' was previously declared within a block",
2569 IDENTIFIER_POINTER (functionid));
2571 /* Write a record describing this implicit function declaration to the
2572 prototypes file (if requested). */
2574 gen_aux_info_record (decl, 0, 1, 0);
2576 /* Possibly apply some default attributes to this implicit declaration. */
2577 decl_attributes (&decl, NULL_TREE, 0);
2583 implicit_decl_warning (id)
2586 const char *name = IDENTIFIER_POINTER (id);
2587 if (mesg_implicit_function_declaration == 2)
2588 error ("implicit declaration of function `%s'", name);
2589 else if (mesg_implicit_function_declaration == 1)
2590 warning ("implicit declaration of function `%s'", name);
2593 /* Return zero if the declaration NEWDECL is valid
2594 when the declaration OLDDECL (assumed to be for the same name)
2595 has already been seen.
2596 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
2597 and 3 if it is a conflicting declaration. */
2600 redeclaration_error_message (newdecl, olddecl)
2601 tree newdecl, olddecl;
2603 if (TREE_CODE (newdecl) == TYPE_DECL)
2605 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2607 /* pushdecl creates distinct types for TYPE_DECLs by calling
2608 build_type_copy, so the above comparison generally fails. We do
2609 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2610 is equivalent to what this code used to do before the build_type_copy
2611 call. The variant type distinction should not matter for traditional
2612 code, because it doesn't have type qualifiers. */
2613 if (flag_traditional
2614 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
2616 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2620 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2622 /* Declarations of functions can insist on internal linkage
2623 but they can't be inconsistent with internal linkage,
2624 so there can be no error on that account.
2625 However defining the same name twice is no good. */
2626 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2627 /* However, defining once as extern inline and a second
2628 time in another way is ok. */
2629 && ! (DECL_DECLARED_INLINE_P (olddecl) && DECL_EXTERNAL (olddecl)
2630 && ! (DECL_DECLARED_INLINE_P (newdecl)
2631 && DECL_EXTERNAL (newdecl))))
2635 else if (DECL_CONTEXT (newdecl) == NULL_TREE)
2637 /* Objects declared at top level: */
2638 /* If at least one is a reference, it's ok. */
2639 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2641 /* Reject two definitions. */
2642 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2644 /* Now we have two tentative defs, or one tentative and one real def. */
2645 /* Insist that the linkage match. */
2646 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2650 else if (current_binding_level->parm_flag
2651 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2655 /* Newdecl has block scope. If olddecl has block scope also, then
2656 reject two definitions, and reject a definition together with an
2657 external reference. Otherwise, it is OK, because newdecl must
2658 be an extern reference to olddecl. */
2659 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2660 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2666 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2667 Create one if none exists so far for the current function.
2668 This function is called for both label definitions and label references. */
2674 tree decl = IDENTIFIER_LABEL_VALUE (id);
2676 if (current_function_decl == 0)
2678 error ("label %s referenced outside of any function",
2679 IDENTIFIER_POINTER (id));
2683 /* Use a label already defined or ref'd with this name. */
2686 /* But not if it is inherited and wasn't declared to be inheritable. */
2687 if (DECL_CONTEXT (decl) != current_function_decl
2688 && ! C_DECLARED_LABEL_FLAG (decl))
2689 return shadow_label (id);
2693 decl = build_decl (LABEL_DECL, id, void_type_node);
2695 /* A label not explicitly declared must be local to where it's ref'd. */
2696 DECL_CONTEXT (decl) = current_function_decl;
2698 DECL_MODE (decl) = VOIDmode;
2700 /* Say where one reference is to the label,
2701 for the sake of the error if it is not defined. */
2702 DECL_SOURCE_LINE (decl) = lineno;
2703 DECL_SOURCE_FILE (decl) = input_filename;
2705 IDENTIFIER_LABEL_VALUE (id) = decl;
2707 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2712 /* Make a label named NAME in the current function,
2713 shadowing silently any that may be inherited from containing functions
2714 or containing scopes.
2716 Note that valid use, if the label being shadowed
2717 comes from another scope in the same function,
2718 requires calling declare_nonlocal_label right away. */
2724 tree decl = IDENTIFIER_LABEL_VALUE (name);
2730 /* Check to make sure that the label hasn't already been declared
2731 at this label scope */
2732 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2733 if (TREE_VALUE (dup) == decl)
2735 error ("duplicate label declaration `%s'",
2736 IDENTIFIER_POINTER (name));
2737 error_with_decl (TREE_VALUE (dup),
2738 "this is a previous declaration");
2739 /* Just use the previous declaration. */
2740 return lookup_label (name);
2743 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2744 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2747 return lookup_label (name);
2750 /* Define a label, specifying the location in the source file.
2751 Return the LABEL_DECL node for the label, if the definition is valid.
2752 Otherwise return 0. */
2755 define_label (filename, line, name)
2756 const char *filename;
2760 tree decl = lookup_label (name);
2762 /* If label with this name is known from an outer context, shadow it. */
2763 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2765 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2766 IDENTIFIER_LABEL_VALUE (name) = 0;
2767 decl = lookup_label (name);
2770 if (warn_traditional && !in_system_header && lookup_name (name))
2771 warning_with_file_and_line (filename, line,
2772 "traditional C lacks a separate namespace for labels, identifier `%s' conflicts",
2773 IDENTIFIER_POINTER (name));
2775 if (DECL_INITIAL (decl) != 0)
2777 error_with_file_and_line (filename, line, "duplicate label `%s'",
2778 IDENTIFIER_POINTER (name));
2783 /* Mark label as having been defined. */
2784 DECL_INITIAL (decl) = error_mark_node;
2785 /* Say where in the source. */
2786 DECL_SOURCE_FILE (decl) = filename;
2787 DECL_SOURCE_LINE (decl) = line;
2792 /* Return the list of declarations of the current level.
2793 Note that this list is in reverse order unless/until
2794 you nreverse it; and when you do nreverse it, you must
2795 store the result back using `storedecls' or you will lose. */
2800 return current_binding_level->names;
2803 /* Return the list of type-tags (for structs, etc) of the current level. */
2808 return current_binding_level->tags;
2811 /* Store the list of declarations of the current level.
2812 This is done for the parameter declarations of a function being defined,
2813 after they are modified in the light of any missing parameters. */
2819 current_binding_level->names = decls;
2822 /* Similarly, store the list of tags of the current level. */
2828 current_binding_level->tags = tags;
2831 /* Given NAME, an IDENTIFIER_NODE,
2832 return the structure (or union or enum) definition for that name.
2833 Searches binding levels from BINDING_LEVEL up to the global level.
2834 If THISLEVEL_ONLY is nonzero, searches only the specified context
2835 (but skips any tag-transparent contexts to find one that is
2836 meaningful for tags).
2837 CODE says which kind of type the caller wants;
2838 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2839 If the wrong kind of type is found, an error is reported. */
2842 lookup_tag (code, name, binding_level, thislevel_only)
2843 enum tree_code code;
2844 struct binding_level *binding_level;
2848 struct binding_level *level;
2851 for (level = binding_level; level; level = level->level_chain)
2854 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2856 if (TREE_PURPOSE (tail) == name)
2858 if (TREE_CODE (TREE_VALUE (tail)) != code)
2860 /* Definition isn't the kind we were looking for. */
2861 pending_invalid_xref = name;
2862 pending_invalid_xref_file = input_filename;
2863 pending_invalid_xref_line = lineno;
2864 /* If in the same binding level as a declaration as a tag
2865 of a different type, this must not be allowed to
2866 shadow that tag, so give the error immediately.
2867 (For example, "struct foo; union foo;" is invalid.) */
2869 pending_xref_error ();
2871 return TREE_VALUE (tail);
2874 if (! level->tag_transparent)
2884 /* Print an error message now
2885 for a recent invalid struct, union or enum cross reference.
2886 We don't print them immediately because they are not invalid
2887 when used in the `struct foo;' construct for shadowing. */
2890 pending_xref_error ()
2892 if (pending_invalid_xref != 0)
2893 error_with_file_and_line (pending_invalid_xref_file,
2894 pending_invalid_xref_line,
2895 "`%s' defined as wrong kind of tag",
2896 IDENTIFIER_POINTER (pending_invalid_xref));
2897 pending_invalid_xref = 0;
2900 /* Given a type, find the tag that was defined for it and return the tag name.
2901 Otherwise return 0. */
2904 lookup_tag_reverse (type)
2907 struct binding_level *level;
2909 for (level = current_binding_level; level; level = level->level_chain)
2912 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2914 if (TREE_VALUE (tail) == type)
2915 return TREE_PURPOSE (tail);
2921 /* Look up NAME in the current binding level and its superiors
2922 in the namespace of variables, functions and typedefs.
2923 Return a ..._DECL node of some kind representing its definition,
2924 or return 0 if it is undefined. */
2932 if (current_binding_level != global_binding_level
2933 && IDENTIFIER_LOCAL_VALUE (name))
2934 val = IDENTIFIER_LOCAL_VALUE (name);
2936 val = IDENTIFIER_GLOBAL_VALUE (name);
2940 /* Similar to `lookup_name' but look only at current binding level. */
2943 lookup_name_current_level (name)
2948 if (current_binding_level == global_binding_level)
2949 return IDENTIFIER_GLOBAL_VALUE (name);
2951 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2954 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2955 if (DECL_NAME (t) == name)
2961 /* Mark ARG for GC. */
2964 mark_binding_level (arg)
2967 struct binding_level *level = *(struct binding_level **) arg;
2969 for (; level != 0; level = level->level_chain)
2971 ggc_mark_tree (level->names);
2972 ggc_mark_tree (level->tags);
2973 ggc_mark_tree (level->shadowed);
2974 ggc_mark_tree (level->blocks);
2975 ggc_mark_tree (level->this_block);
2976 ggc_mark_tree (level->parm_order);
2980 /* Create the predefined scalar types of C,
2981 and some nodes representing standard constants (0, 1, (void *) 0).
2982 Initialize the global binding level.
2983 Make definitions for built-in primitive functions. */
2986 c_init_decl_processing ()
2989 tree ptr_ftype_void, ptr_ftype_ptr;
2991 /* Adds some ggc roots, and reserved words for c-parse.in. */
2994 current_function_decl = NULL;
2995 named_labels = NULL;
2996 current_binding_level = NULL_BINDING_LEVEL;
2997 free_binding_level = NULL_BINDING_LEVEL;
2999 /* Make the binding_level structure for global names. */
3001 global_binding_level = current_binding_level;
3003 build_common_tree_nodes (flag_signed_char);
3005 c_common_nodes_and_builtins ();
3007 boolean_type_node = integer_type_node;
3008 boolean_true_node = integer_one_node;
3009 boolean_false_node = integer_zero_node;
3011 /* With GCC, C99's _Bool is always of size 1. */
3012 c_bool_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
3013 TREE_SET_CODE (c_bool_type_node, BOOLEAN_TYPE);
3014 TYPE_MAX_VALUE (c_bool_type_node) = build_int_2 (1, 0);
3015 TREE_TYPE (TYPE_MAX_VALUE (c_bool_type_node)) = c_bool_type_node;
3016 TYPE_PRECISION (c_bool_type_node) = 1;
3017 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
3019 c_bool_false_node = build_int_2 (0, 0);
3020 TREE_TYPE (c_bool_false_node) = c_bool_type_node;
3021 c_bool_true_node = build_int_2 (1, 0);
3022 TREE_TYPE (c_bool_true_node) = c_bool_type_node;
3024 endlink = void_list_node;
3025 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
3027 = build_function_type (ptr_type_node,
3028 tree_cons (NULL_TREE, ptr_type_node, endlink));
3030 /* Types which are common to the fortran compiler and libf2c. When
3031 changing these, you also need to be concerned with f/com.h. */
3033 if (TYPE_PRECISION (float_type_node)
3034 == TYPE_PRECISION (long_integer_type_node))
3036 g77_integer_type_node = long_integer_type_node;
3037 g77_uinteger_type_node = long_unsigned_type_node;
3039 else if (TYPE_PRECISION (float_type_node)
3040 == TYPE_PRECISION (integer_type_node))
3042 g77_integer_type_node = integer_type_node;
3043 g77_uinteger_type_node = unsigned_type_node;
3046 g77_integer_type_node = g77_uinteger_type_node = NULL_TREE;
3048 if (g77_integer_type_node != NULL_TREE)
3050 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_integer"),
3051 g77_integer_type_node));
3052 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_uinteger"),
3053 g77_uinteger_type_node));
3056 if (TYPE_PRECISION (float_type_node) * 2
3057 == TYPE_PRECISION (long_integer_type_node))
3059 g77_longint_type_node = long_integer_type_node;
3060 g77_ulongint_type_node = long_unsigned_type_node;
3062 else if (TYPE_PRECISION (float_type_node) * 2
3063 == TYPE_PRECISION (long_long_integer_type_node))
3065 g77_longint_type_node = long_long_integer_type_node;
3066 g77_ulongint_type_node = long_long_unsigned_type_node;
3069 g77_longint_type_node = g77_ulongint_type_node = NULL_TREE;
3071 if (g77_longint_type_node != NULL_TREE)
3073 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_longint"),
3074 g77_longint_type_node));
3075 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_ulongint"),
3076 g77_ulongint_type_node));
3079 pedantic_lvalues = pedantic;
3081 make_fname_decl = c_make_fname_decl;
3082 start_fname_decls ();
3084 incomplete_decl_finalize_hook = finish_incomplete_decl;
3086 /* Record our roots. */
3088 ggc_add_tree_root (c_global_trees, CTI_MAX);
3089 ggc_add_root (&c_stmt_tree, 1, sizeof c_stmt_tree, mark_stmt_tree);
3090 ggc_add_tree_root (&c_scope_stmt_stack, 1);
3091 ggc_add_tree_root (&named_labels, 1);
3092 ggc_add_tree_root (&shadowed_labels, 1);
3093 ggc_add_root (¤t_binding_level, 1, sizeof current_binding_level,
3094 mark_binding_level);
3095 ggc_add_root (&label_level_chain, 1, sizeof label_level_chain,
3096 mark_binding_level);
3097 ggc_add_tree_root (&static_ctors, 1);
3098 ggc_add_tree_root (&static_dtors, 1);
3101 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3102 decl, NAME is the initialization string and TYPE_DEP indicates whether
3103 NAME depended on the type of the function. As we don't yet implement
3104 delayed emission of static data, we mark the decl as emitted
3105 so it is not placed in the output. Anything using it must therefore pull
3106 out the STRING_CST initializer directly. This does mean that these names
3107 are string merging candidates, which is wrong for C99's __func__. FIXME. */
3110 c_make_fname_decl (id, type_dep)
3114 const char *name = fname_as_string (type_dep);
3115 tree decl, type, init;
3116 size_t length = strlen (name);
3118 type = build_array_type
3119 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
3120 build_index_type (size_int (length)));
3122 decl = build_decl (VAR_DECL, id, type);
3123 /* We don't push the decl, so have to set its context here. */
3124 DECL_CONTEXT (decl) = current_function_decl;
3126 TREE_STATIC (decl) = 1;
3127 TREE_READONLY (decl) = 1;
3128 DECL_ARTIFICIAL (decl) = 1;
3130 init = build_string (length + 1, name);
3131 TREE_TYPE (init) = type;
3132 DECL_INITIAL (decl) = init;
3134 TREE_USED (decl) = 1;
3136 finish_decl (decl, init, NULL_TREE);
3141 /* Return a definition for a builtin function named NAME and whose data type
3142 is TYPE. TYPE should be a function type with argument types.
3143 FUNCTION_CODE tells later passes how to compile calls to this function.
3144 See tree.h for its possible values.
3146 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3147 the name to be called if we can't opencode the function. */
3150 builtin_function (name, type, function_code, class, library_name)
3154 enum built_in_class class;
3155 const char *library_name;
3157 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3158 DECL_EXTERNAL (decl) = 1;
3159 TREE_PUBLIC (decl) = 1;
3160 /* If -traditional, permit redefining a builtin function any way you like.
3161 (Though really, if the program redefines these functions,
3162 it probably won't work right unless compiled with -fno-builtin.) */
3163 if (flag_traditional && name[0] != '_')
3164 DECL_BUILT_IN_NONANSI (decl) = 1;
3166 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
3167 make_decl_rtl (decl, NULL);
3169 DECL_BUILT_IN_CLASS (decl) = class;
3170 DECL_FUNCTION_CODE (decl) = function_code;
3172 /* Warn if a function in the namespace for users
3173 is used without an occasion to consider it declared. */
3174 if (name[0] != '_' || name[1] != '_')
3175 C_DECL_ANTICIPATED (decl) = 1;
3177 /* Possibly apply some default attributes to this built-in function. */
3178 decl_attributes (&decl, NULL_TREE, 0);
3183 /* Apply default attributes to a function, if a system function with default
3187 insert_default_attributes (decl)
3190 if (!TREE_PUBLIC (decl))
3192 c_common_insert_default_attributes (decl);
3195 /* Called when a declaration is seen that contains no names to declare.
3196 If its type is a reference to a structure, union or enum inherited
3197 from a containing scope, shadow that tag name for the current scope
3198 with a forward reference.
3199 If its type defines a new named structure or union
3200 or defines an enum, it is valid but we need not do anything here.
3201 Otherwise, it is an error. */
3204 shadow_tag (declspecs)
3207 shadow_tag_warned (declspecs, 0);
3211 shadow_tag_warned (declspecs, warned)
3214 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3221 pending_invalid_xref = 0;
3223 /* Remove the attributes from declspecs, since they will confuse the
3225 split_specs_attrs (declspecs, &specs, &attrs);
3227 for (link = specs; link; link = TREE_CHAIN (link))
3229 tree value = TREE_VALUE (link);
3230 enum tree_code code = TREE_CODE (value);
3232 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3233 /* Used to test also that TYPE_SIZE (value) != 0.
3234 That caused warning for `struct foo;' at top level in the file. */
3236 tree name = lookup_tag_reverse (value);
3243 if (warned != 1 && code != ENUMERAL_TYPE)
3244 /* Empty unnamed enum OK */
3246 pedwarn ("unnamed struct/union that defines no instances");
3252 t = lookup_tag (code, name, current_binding_level, 1);
3256 t = make_node (code);
3263 if (!warned && ! in_system_header)
3265 warning ("useless keyword or type name in empty declaration");
3272 error ("two types specified in one empty declaration");
3277 pedwarn ("empty declaration");
3281 /* Construct an array declarator. EXPR is the expression inside [], or
3282 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
3283 to the pointer to which a parameter array is converted). STATIC_P is
3284 non-zero if "static" is inside the [], zero otherwise. VLA_UNSPEC_P
3285 is non-zero is the array is [*], a VLA of unspecified length which is
3286 nevertheless a complete type (not currently implemented by GCC),
3287 zero otherwise. The declarator is constructed as an ARRAY_REF
3288 (to be decoded by grokdeclarator), whose operand 0 is what's on the
3289 left of the [] (filled by in set_array_declarator_type) and operand 1
3290 is the expression inside; whose TREE_TYPE is the type qualifiers and
3291 which has TREE_STATIC set if "static" is used. */
3294 build_array_declarator (expr, quals, static_p, vla_unspec_p)
3301 decl = build_nt (ARRAY_REF, NULL_TREE, expr);
3302 TREE_TYPE (decl) = quals;
3303 TREE_STATIC (decl) = (static_p ? 1 : 0);
3304 if (pedantic && !flag_isoc99)
3306 if (static_p || quals != NULL_TREE)
3307 pedwarn ("ISO C89 does not support `static' or type qualifiers in parameter array declarators");
3309 pedwarn ("ISO C89 does not support `[*]' array declarators");
3312 warning ("GCC does not yet properly implement `[*]' array declarators");
3316 /* Set the type of an array declarator. DECL is the declarator, as
3317 constructed by build_array_declarator; TYPE is what appears on the left
3318 of the [] and goes in operand 0. ABSTRACT_P is non-zero if it is an
3319 abstract declarator, zero otherwise; this is used to reject static and
3320 type qualifiers in abstract declarators, where they are not in the
3324 set_array_declarator_type (decl, type, abstract_p)
3329 TREE_OPERAND (decl, 0) = type;
3330 if (abstract_p && (TREE_TYPE (decl) != NULL_TREE || TREE_STATIC (decl)))
3331 error ("static or type qualifiers in abstract declarator");
3335 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3338 groktypename (typename)
3341 if (TREE_CODE (typename) != TREE_LIST)
3343 return grokdeclarator (TREE_VALUE (typename),
3344 TREE_PURPOSE (typename),
3348 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3351 groktypename_in_parm_context (typename)
3354 if (TREE_CODE (typename) != TREE_LIST)
3356 return grokdeclarator (TREE_VALUE (typename),
3357 TREE_PURPOSE (typename),
3361 /* Decode a declarator in an ordinary declaration or data definition.
3362 This is called as soon as the type information and variable name
3363 have been parsed, before parsing the initializer if any.
3364 Here we create the ..._DECL node, fill in its type,
3365 and put it on the list of decls for the current context.
3366 The ..._DECL node is returned as the value.
3368 Exception: for arrays where the length is not specified,
3369 the type is left null, to be filled in by `finish_decl'.
3371 Function definitions do not come here; they go to start_function
3372 instead. However, external and forward declarations of functions
3373 do go through here. Structure field declarations are done by
3374 grokfield and not through here. */
3377 start_decl (declarator, declspecs, initialized, attributes)
3378 tree declarator, declspecs;
3382 tree decl = grokdeclarator (declarator, declspecs,
3383 NORMAL, initialized);
3386 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3387 && MAIN_NAME_P (DECL_NAME (decl)))
3388 warning_with_decl (decl, "`%s' is usually a function");
3391 /* Is it valid for this decl to have an initializer at all?
3392 If not, set INITIALIZED to zero, which will indirectly
3393 tell `finish_decl' to ignore the initializer once it is parsed. */
3394 switch (TREE_CODE (decl))
3397 /* typedef foo = bar means give foo the same type as bar.
3398 We haven't parsed bar yet, so `finish_decl' will fix that up.
3399 Any other case of an initialization in a TYPE_DECL is an error. */
3400 if (pedantic || list_length (declspecs) > 1)
3402 error ("typedef `%s' is initialized",
3403 IDENTIFIER_POINTER (DECL_NAME (decl)));
3409 error ("function `%s' is initialized like a variable",
3410 IDENTIFIER_POINTER (DECL_NAME (decl)));
3415 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3416 error ("parameter `%s' is initialized",
3417 IDENTIFIER_POINTER (DECL_NAME (decl)));
3422 /* Don't allow initializations for incomplete types
3423 except for arrays which might be completed by the initialization. */
3425 /* This can happen if the array size is an undefined macro. We already
3426 gave a warning, so we don't need another one. */
3427 if (TREE_TYPE (decl) == error_mark_node)
3429 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3431 /* A complete type is ok if size is fixed. */
3433 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3434 || C_DECL_VARIABLE_SIZE (decl))
3436 error ("variable-sized object may not be initialized");
3440 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3442 error ("variable `%s' has initializer but incomplete type",
3443 IDENTIFIER_POINTER (DECL_NAME (decl)));
3446 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
3448 error ("elements of array `%s' have incomplete type",
3449 IDENTIFIER_POINTER (DECL_NAME (decl)));
3457 /* Seems redundant with grokdeclarator. */
3458 if (current_binding_level != global_binding_level
3459 && DECL_EXTERNAL (decl)
3460 && TREE_CODE (decl) != FUNCTION_DECL)
3461 warning ("declaration of `%s' has `extern' and is initialized",
3462 IDENTIFIER_POINTER (DECL_NAME (decl)));
3464 DECL_EXTERNAL (decl) = 0;
3465 if (current_binding_level == global_binding_level)
3466 TREE_STATIC (decl) = 1;
3468 /* Tell `pushdecl' this is an initialized decl
3469 even though we don't yet have the initializer expression.
3470 Also tell `finish_decl' it may store the real initializer. */
3471 DECL_INITIAL (decl) = error_mark_node;
3474 /* If this is a function declaration, write a record describing it to the
3475 prototypes file (if requested). */
3477 if (TREE_CODE (decl) == FUNCTION_DECL)
3478 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3480 /* ANSI specifies that a tentative definition which is not merged with
3481 a non-tentative definition behaves exactly like a definition with an
3482 initializer equal to zero. (Section 3.7.2)
3483 -fno-common gives strict ANSI behavior. Usually you don't want it.
3484 This matters only for variables with external linkage. */
3485 if (! flag_no_common || ! TREE_PUBLIC (decl))
3486 DECL_COMMON (decl) = 1;
3488 /* Set attributes here so if duplicate decl, will have proper attributes. */
3489 decl_attributes (&decl, attributes, 0);
3491 if (TREE_CODE (decl) == FUNCTION_DECL
3492 && DECL_DECLARED_INLINE_P (decl)
3493 && DECL_UNINLINABLE (decl)
3494 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
3495 warning_with_decl (decl,
3496 "inline function `%s' given attribute noinline");
3498 /* Add this decl to the current binding level.
3499 TEM may equal DECL or it may be a previous decl of the same name. */
3500 tem = pushdecl (decl);
3502 /* For a local variable, define the RTL now. */
3503 if (current_binding_level != global_binding_level
3504 /* But not if this is a duplicate decl
3505 and we preserved the rtl from the previous one
3506 (which may or may not happen). */
3507 && !DECL_RTL_SET_P (tem)
3508 && !DECL_CONTEXT (tem))
3510 if (TREE_TYPE (tem) != error_mark_node
3511 && COMPLETE_TYPE_P (TREE_TYPE (tem)))
3513 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3514 && DECL_INITIAL (tem) != 0)
3521 /* Finish processing of a declaration;
3522 install its initial value.
3523 If the length of an array type is not known before,
3524 it must be determined now, from the initial value, or it is an error. */
3527 finish_decl (decl, init, asmspec_tree)
3531 tree type = TREE_TYPE (decl);
3532 int was_incomplete = (DECL_SIZE (decl) == 0);
3533 const char *asmspec = 0;
3535 /* If a name was specified, get the string. */
3537 asmspec = TREE_STRING_POINTER (asmspec_tree);
3539 /* If `start_decl' didn't like having an initialization, ignore it now. */
3540 if (init != 0 && DECL_INITIAL (decl) == 0)
3543 /* Don't crash if parm is initialized. */
3544 if (TREE_CODE (decl) == PARM_DECL)
3549 if (TREE_CODE (decl) != TYPE_DECL)
3550 store_init_value (decl, init);
3553 /* typedef foo = bar; store the type of bar as the type of foo. */
3554 TREE_TYPE (decl) = TREE_TYPE (init);
3555 DECL_INITIAL (decl) = init = 0;
3559 /* Deduce size of array from initialization, if not already known */
3560 if (TREE_CODE (type) == ARRAY_TYPE
3561 && TYPE_DOMAIN (type) == 0
3562 && TREE_CODE (decl) != TYPE_DECL)
3565 = (TREE_STATIC (decl)
3566 /* Even if pedantic, an external linkage array
3567 may have incomplete type at first. */
3568 ? pedantic && !TREE_PUBLIC (decl)
3569 : !DECL_EXTERNAL (decl));
3571 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3573 /* Get the completed type made by complete_array_type. */
3574 type = TREE_TYPE (decl);
3577 error_with_decl (decl, "initializer fails to determine size of `%s'");
3579 else if (failure == 2)
3582 error_with_decl (decl, "array size missing in `%s'");
3583 /* If a `static' var's size isn't known,
3584 make it extern as well as static, so it does not get
3586 If it is not `static', then do not mark extern;
3587 finish_incomplete_decl will give it a default size
3588 and it will get allocated. */
3589 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3590 DECL_EXTERNAL (decl) = 1;
3593 /* TYPE_MAX_VALUE is always one less than the number of elements
3594 in the array, because we start counting at zero. Therefore,
3595 warn only if the value is less than zero. */
3596 else if (pedantic && TYPE_DOMAIN (type) != 0
3597 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3598 error_with_decl (decl, "zero or negative size array `%s'");
3600 layout_decl (decl, 0);
3603 if (TREE_CODE (decl) == VAR_DECL)
3605 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
3606 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3607 layout_decl (decl, 0);
3609 if (DECL_SIZE (decl) == 0
3610 /* Don't give an error if we already gave one earlier. */
3611 && TREE_TYPE (decl) != error_mark_node
3612 && (TREE_STATIC (decl)
3614 /* A static variable with an incomplete type
3615 is an error if it is initialized.
3616 Also if it is not file scope.
3617 Otherwise, let it through, but if it is not `extern'
3618 then it may cause an error message later. */
3619 (DECL_INITIAL (decl) != 0
3620 || DECL_CONTEXT (decl) != 0)
3622 /* An automatic variable with an incomplete type
3624 !DECL_EXTERNAL (decl)))
3626 error_with_decl (decl, "storage size of `%s' isn't known");
3627 TREE_TYPE (decl) = error_mark_node;
3630 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3631 && DECL_SIZE (decl) != 0)
3633 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3634 constant_expression_warning (DECL_SIZE (decl));
3636 error_with_decl (decl, "storage size of `%s' isn't constant");
3639 if (TREE_USED (type))
3640 TREE_USED (decl) = 1;
3643 /* If this is a function and an assembler name is specified, it isn't
3644 builtin any more. Also reset DECL_RTL so we can give it its new
3646 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3648 DECL_BUILT_IN_CLASS (decl) = NOT_BUILT_IN;
3649 SET_DECL_RTL (decl, NULL_RTX);
3650 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
3653 /* Output the assembler code and/or RTL code for variables and functions,
3654 unless the type is an undefined structure or union.
3655 If not, it will get done when the type is completed. */
3657 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3659 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3660 maybe_objc_check_decl (decl);
3662 if (!DECL_CONTEXT (decl))
3664 if (DECL_INITIAL (decl) == NULL_TREE
3665 || DECL_INITIAL (decl) == error_mark_node)
3666 /* Don't output anything
3667 when a tentative file-scope definition is seen.
3668 But at end of compilation, do output code for them. */
3669 DECL_DEFER_OUTPUT (decl) = 1;
3670 rest_of_decl_compilation (decl, asmspec,
3671 (DECL_CONTEXT (decl) == 0
3672 || TREE_ASM_WRITTEN (decl)), 0);
3676 /* This is a local variable. If there is an ASMSPEC, the
3677 user has requested that we handle it specially. */
3680 /* In conjunction with an ASMSPEC, the `register'
3681 keyword indicates that we should place the variable
3682 in a particular register. */
3683 if (DECL_REGISTER (decl))
3684 DECL_C_HARD_REGISTER (decl) = 1;
3686 /* If this is not a static variable, issue a warning.
3687 It doesn't make any sense to give an ASMSPEC for an
3688 ordinary, non-register local variable. Historically,
3689 GCC has accepted -- but ignored -- the ASMSPEC in
3691 if (TREE_CODE (decl) == VAR_DECL
3692 && !DECL_REGISTER (decl)
3693 && !TREE_STATIC (decl))
3694 warning_with_decl (decl,
3695 "ignoring asm-specifier for non-static local variable `%s'");
3697 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
3700 if (TREE_CODE (decl) != FUNCTION_DECL)
3701 add_decl_stmt (decl);
3704 if (DECL_CONTEXT (decl) != 0)
3706 /* Recompute the RTL of a local array now
3707 if it used to be an incomplete type. */
3709 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3711 /* If we used it already as memory, it must stay in memory. */
3712 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3713 /* If it's still incomplete now, no init will save it. */
3714 if (DECL_SIZE (decl) == 0)
3715 DECL_INITIAL (decl) = 0;
3720 if (TREE_CODE (decl) == TYPE_DECL)
3722 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3723 maybe_objc_check_decl (decl);
3724 rest_of_decl_compilation (decl, NULL, DECL_CONTEXT (decl) == 0, 0);
3727 /* At the end of a declaration, throw away any variable type sizes
3728 of types defined inside that declaration. There is no use
3729 computing them in the following function definition. */
3730 if (current_binding_level == global_binding_level)
3731 get_pending_sizes ();
3734 /* If DECL has a cleanup, build and return that cleanup here.
3735 This is a callback called by expand_expr. */
3738 maybe_build_cleanup (decl)
3739 tree decl ATTRIBUTE_UNUSED;
3741 /* There are no cleanups in C. */
3745 /* Given a parsed parameter declaration,
3746 decode it into a PARM_DECL and push that on the current binding level.
3747 Also, for the sake of forward parm decls,
3748 record the given order of parms in `parm_order'. */
3751 push_parm_decl (parm)
3755 int old_immediate_size_expand = immediate_size_expand;
3756 /* Don't try computing parm sizes now -- wait till fn is called. */
3757 immediate_size_expand = 0;
3759 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3760 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3761 decl_attributes (&decl, TREE_VALUE (parm), 0);
3764 if (DECL_NAME (decl))
3767 olddecl = lookup_name (DECL_NAME (decl));
3768 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3769 pedwarn_with_decl (decl,
3770 "ISO C forbids parameter `%s' shadowing typedef");
3774 decl = pushdecl (decl);
3776 immediate_size_expand = old_immediate_size_expand;
3778 current_binding_level->parm_order
3779 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3781 /* Add this decl to the current binding level. */
3782 finish_decl (decl, NULL_TREE, NULL_TREE);
3785 /* Clear the given order of parms in `parm_order'.
3786 Used at start of parm list,
3787 and also at semicolon terminating forward decls. */
3792 current_binding_level->parm_order = NULL_TREE;
3795 /* Make TYPE a complete type based on INITIAL_VALUE.
3796 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3797 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3800 complete_array_type (type, initial_value, do_default)
3805 tree maxindex = NULL_TREE;
3810 /* Note MAXINDEX is really the maximum index,
3811 one less than the size. */
3812 if (TREE_CODE (initial_value) == STRING_CST)
3815 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3816 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3819 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3821 tree elts = CONSTRUCTOR_ELTS (initial_value);
3822 maxindex = build_int_2 (-1, -1);
3823 for (; elts; elts = TREE_CHAIN (elts))
3825 if (TREE_PURPOSE (elts))
3826 maxindex = TREE_PURPOSE (elts);
3828 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3829 maxindex, integer_one_node));
3831 maxindex = copy_node (maxindex);
3835 /* Make an error message unless that happened already. */
3836 if (initial_value != error_mark_node)
3839 /* Prevent further error messages. */
3840 maxindex = build_int_2 (0, 0);
3847 maxindex = build_int_2 (0, 0);
3853 TYPE_DOMAIN (type) = build_index_type (maxindex);
3854 if (!TREE_TYPE (maxindex))
3855 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3858 /* Lay out the type now that we can get the real answer. */
3865 /* Given declspecs and a declarator,
3866 determine the name and type of the object declared
3867 and construct a ..._DECL node for it.
3868 (In one case we can return a ..._TYPE node instead.
3869 For invalid input we sometimes return 0.)
3871 DECLSPECS is a chain of tree_list nodes whose value fields
3872 are the storage classes and type specifiers.
3874 DECL_CONTEXT says which syntactic context this declaration is in:
3875 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3876 FUNCDEF for a function definition. Like NORMAL but a few different
3877 error messages in each case. Return value may be zero meaning
3878 this definition is too screwy to try to parse.
3879 PARM for a parameter declaration (either within a function prototype
3880 or before a function body). Make a PARM_DECL, or return void_type_node.
3881 TYPENAME if for a typename (in a cast or sizeof).
3882 Don't make a DECL node; just return the ..._TYPE node.
3883 FIELD for a struct or union field; make a FIELD_DECL.
3884 BITFIELD for a field with specified width.
3885 INITIALIZED is 1 if the decl has an initializer.
3887 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3888 It may also be so in the PARM case, for a prototype where the
3889 argument type is specified but not the name.
3891 This function is where the complicated C meanings of `static'
3892 and `extern' are interpreted. */
3895 grokdeclarator (declarator, declspecs, decl_context, initialized)
3898 enum decl_context decl_context;
3903 tree type = NULL_TREE;
3908 int type_quals = TYPE_UNQUALIFIED;
3910 int explicit_int = 0;
3911 int explicit_char = 0;
3912 int defaulted_int = 0;
3913 tree typedef_decl = 0;
3915 tree typedef_type = 0;
3916 int funcdef_flag = 0;
3917 enum tree_code innermost_code = ERROR_MARK;
3919 int size_varies = 0;
3920 tree decl_attr = NULL_TREE;
3921 tree array_ptr_quals = NULL_TREE;
3922 int array_parm_static = 0;
3923 tree returned_attrs = NULL_TREE;
3925 if (decl_context == BITFIELD)
3926 bitfield = 1, decl_context = FIELD;
3928 if (decl_context == FUNCDEF)
3929 funcdef_flag = 1, decl_context = NORMAL;
3931 /* Look inside a declarator for the name being declared
3932 and get it as a string, for an error message. */
3934 tree decl = declarator;
3938 switch (TREE_CODE (decl))
3943 innermost_code = TREE_CODE (decl);
3944 decl = TREE_OPERAND (decl, 0);
3948 decl = TREE_VALUE (decl);
3951 case IDENTIFIER_NODE:
3952 name = IDENTIFIER_POINTER (decl);
3963 /* A function definition's declarator must have the form of
3964 a function declarator. */
3966 if (funcdef_flag && innermost_code != CALL_EXPR)
3969 /* Anything declared one level down from the top level
3970 must be one of the parameters of a function
3971 (because the body is at least two levels down). */
3973 /* If this looks like a function definition, make it one,
3974 even if it occurs where parms are expected.
3975 Then store_parm_decls will reject it and not use it as a parm. */
3976 if (decl_context == NORMAL && !funcdef_flag
3977 && current_binding_level->parm_flag)
3978 decl_context = PARM;
3980 /* Look through the decl specs and record which ones appear.
3981 Some typespecs are defined as built-in typenames.
3982 Others, the ones that are modifiers of other types,
3983 are represented by bits in SPECBITS: set the bits for
3984 the modifiers that appear. Storage class keywords are also in SPECBITS.
3986 If there is a typedef name or a type, store the type in TYPE.
3987 This includes builtin typedefs such as `int'.
3989 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3990 and did not come from a user typedef.
3992 Set LONGLONG if `long' is mentioned twice. */
3994 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3996 tree id = TREE_VALUE (spec);
3998 if (id == ridpointers[(int) RID_INT])
4000 if (id == ridpointers[(int) RID_CHAR])
4003 if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
4005 enum rid i = C_RID_CODE (id);
4006 if ((int) i <= (int) RID_LAST_MODIFIER)
4008 if (i == RID_LONG && (specbits & (1 << (int) i)))
4011 error ("`long long long' is too long for GCC");
4014 if (pedantic && !flag_isoc99 && ! in_system_header
4016 pedwarn ("ISO C89 does not support `long long'");
4020 else if (specbits & (1 << (int) i))
4021 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
4022 specbits |= 1 << (int) i;
4027 error ("two or more data types in declaration of `%s'", name);
4028 /* Actual typedefs come to us as TYPE_DECL nodes. */
4029 else if (TREE_CODE (id) == TYPE_DECL)
4031 type = TREE_TYPE (id);
4032 decl_attr = DECL_ATTRIBUTES (id);
4035 /* Built-in types come as identifiers. */
4036 else if (TREE_CODE (id) == IDENTIFIER_NODE)
4038 tree t = lookup_name (id);
4039 if (TREE_TYPE (t) == error_mark_node)
4041 else if (!t || TREE_CODE (t) != TYPE_DECL)
4042 error ("`%s' fails to be a typedef or built in type",
4043 IDENTIFIER_POINTER (id));
4046 type = TREE_TYPE (t);
4050 else if (TREE_CODE (id) != ERROR_MARK)
4057 typedef_type = type;
4059 size_varies = C_TYPE_VARIABLE_SIZE (type);
4061 /* No type at all: default to `int', and set DEFAULTED_INT
4062 because it was not a user-defined typedef. */
4066 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4067 | (1 << (int) RID_SIGNED)
4068 | (1 << (int) RID_UNSIGNED)
4069 | (1 << (int) RID_COMPLEX))))
4070 /* Don't warn about typedef foo = bar. */
4071 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
4072 && ! in_system_header)
4074 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
4075 and this is a function, or if -Wimplicit; prefer the former
4076 warning since it is more explicit. */
4077 if ((warn_implicit_int || warn_return_type || flag_isoc99)
4079 warn_about_return_type = 1;
4080 else if (warn_implicit_int || flag_isoc99)
4081 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
4086 type = integer_type_node;
4089 /* Now process the modifiers that were specified
4090 and check for invalid combinations. */
4092 /* Long double is a special combination. */
4094 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4095 && TYPE_MAIN_VARIANT (type) == double_type_node)
4097 specbits &= ~(1 << (int) RID_LONG);
4098 type = long_double_type_node;
4101 /* Check all other uses of type modifiers. */
4103 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4104 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4108 if ((specbits & 1 << (int) RID_LONG)
4109 && (specbits & 1 << (int) RID_SHORT))
4110 error ("both long and short specified for `%s'", name);
4111 else if (((specbits & 1 << (int) RID_LONG)
4112 || (specbits & 1 << (int) RID_SHORT))
4114 error ("long or short specified with char for `%s'", name);
4115 else if (((specbits & 1 << (int) RID_LONG)
4116 || (specbits & 1 << (int) RID_SHORT))
4117 && TREE_CODE (type) == REAL_TYPE)
4119 static int already = 0;
4121 error ("long or short specified with floating type for `%s'", name);
4122 if (! already && ! pedantic)
4124 error ("the only valid combination is `long double'");
4128 else if ((specbits & 1 << (int) RID_SIGNED)
4129 && (specbits & 1 << (int) RID_UNSIGNED))
4130 error ("both signed and unsigned specified for `%s'", name);
4131 else if (TREE_CODE (type) != INTEGER_TYPE)
4132 error ("long, short, signed or unsigned invalid for `%s'", name);
4136 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4138 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4140 if (flag_pedantic_errors)
4145 /* Discard the type modifiers if they are invalid. */
4148 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4149 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4154 if ((specbits & (1 << (int) RID_COMPLEX))
4155 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4157 error ("complex invalid for `%s'", name);
4158 specbits &= ~(1 << (int) RID_COMPLEX);
4161 /* Decide whether an integer type is signed or not.
4162 Optionally treat bitfields as signed by default. */
4163 if (specbits & 1 << (int) RID_UNSIGNED
4164 /* Traditionally, all bitfields are unsigned. */
4165 || (bitfield && flag_traditional
4166 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4167 || (bitfield && ! flag_signed_bitfields
4168 && (explicit_int || defaulted_int || explicit_char
4169 /* A typedef for plain `int' without `signed'
4170 can be controlled just like plain `int'. */
4171 || ! (typedef_decl != 0
4172 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4173 && TREE_CODE (type) != ENUMERAL_TYPE
4174 && !(specbits & 1 << (int) RID_SIGNED)))
4177 type = long_long_unsigned_type_node;
4178 else if (specbits & 1 << (int) RID_LONG)
4179 type = long_unsigned_type_node;
4180 else if (specbits & 1 << (int) RID_SHORT)
4181 type = short_unsigned_type_node;
4182 else if (type == char_type_node)
4183 type = unsigned_char_type_node;
4184 else if (typedef_decl)
4185 type = unsigned_type (type);
4187 type = unsigned_type_node;
4189 else if ((specbits & 1 << (int) RID_SIGNED)
4190 && type == char_type_node)
4191 type = signed_char_type_node;
4193 type = long_long_integer_type_node;
4194 else if (specbits & 1 << (int) RID_LONG)
4195 type = long_integer_type_node;
4196 else if (specbits & 1 << (int) RID_SHORT)
4197 type = short_integer_type_node;
4199 if (specbits & 1 << (int) RID_COMPLEX)
4201 if (pedantic && !flag_isoc99)
4202 pedwarn ("ISO C89 does not support complex types");
4203 /* If we just have "complex", it is equivalent to
4204 "complex double", but if any modifiers at all are specified it is
4205 the complex form of TYPE. E.g, "complex short" is
4206 "complex short int". */
4208 if (defaulted_int && ! longlong
4209 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4210 | (1 << (int) RID_SIGNED)
4211 | (1 << (int) RID_UNSIGNED))))
4214 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
4215 type = complex_double_type_node;
4217 else if (type == integer_type_node)
4220 pedwarn ("ISO C does not support complex integer types");
4221 type = complex_integer_type_node;
4223 else if (type == float_type_node)
4224 type = complex_float_type_node;
4225 else if (type == double_type_node)
4226 type = complex_double_type_node;
4227 else if (type == long_double_type_node)
4228 type = complex_long_double_type_node;
4232 pedwarn ("ISO C does not support complex integer types");
4233 type = build_complex_type (type);
4237 /* Figure out the type qualifiers for the declaration. There are
4238 two ways a declaration can become qualified. One is something
4239 like `const int i' where the `const' is explicit. Another is
4240 something like `typedef const int CI; CI i' where the type of the
4241 declaration contains the `const'. */
4242 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4243 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
4244 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4245 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4246 if (constp > 1 && ! flag_isoc99)
4247 pedwarn ("duplicate `const'");
4248 if (restrictp > 1 && ! flag_isoc99)
4249 pedwarn ("duplicate `restrict'");
4250 if (volatilep > 1 && ! flag_isoc99)
4251 pedwarn ("duplicate `volatile'");
4252 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
4253 type = TYPE_MAIN_VARIANT (type);
4254 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4255 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4256 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4258 /* Warn if two storage classes are given. Default to `auto'. */
4263 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4264 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4265 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4266 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4267 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4269 /* Warn about storage classes that are invalid for certain
4270 kinds of declarations (parameters, typenames, etc.). */
4273 error ("multiple storage classes in declaration of `%s'", name);
4274 else if (funcdef_flag
4276 & ((1 << (int) RID_REGISTER)
4277 | (1 << (int) RID_AUTO)
4278 | (1 << (int) RID_TYPEDEF))))
4280 if (specbits & 1 << (int) RID_AUTO
4281 && (pedantic || current_binding_level == global_binding_level))
4282 pedwarn ("function definition declared `auto'");
4283 if (specbits & 1 << (int) RID_REGISTER)
4284 error ("function definition declared `register'");
4285 if (specbits & 1 << (int) RID_TYPEDEF)
4286 error ("function definition declared `typedef'");
4287 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4288 | (1 << (int) RID_AUTO));
4290 else if (decl_context != NORMAL && nclasses > 0)
4292 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4296 switch (decl_context)
4299 error ("storage class specified for structure field `%s'",
4303 error ("storage class specified for parameter `%s'", name);
4306 error ("storage class specified for typename");
4309 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4310 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4311 | (1 << (int) RID_EXTERN));
4314 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4316 /* `extern' with initialization is invalid if not at top level. */
4317 if (current_binding_level == global_binding_level)
4318 warning ("`%s' initialized and declared `extern'", name);
4320 error ("`%s' has both `extern' and initializer", name);
4322 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4323 && current_binding_level != global_binding_level)
4324 error ("nested function `%s' declared `extern'", name);
4325 else if (current_binding_level == global_binding_level
4326 && specbits & (1 << (int) RID_AUTO))
4327 error ("top-level declaration of `%s' specifies `auto'", name);
4330 /* Now figure out the structure of the declarator proper.
4331 Descend through it, creating more complex types, until we reach
4332 the declared identifier (or NULL_TREE, in an absolute declarator). */
4334 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4336 if (type == error_mark_node)
4338 declarator = TREE_OPERAND (declarator, 0);
4342 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4343 an INDIRECT_REF (for *...),
4344 a CALL_EXPR (for ...(...)),
4345 a TREE_LIST (for nested attributes),
4346 an identifier (for the name being declared)
4347 or a null pointer (for the place in an absolute declarator
4348 where the name was omitted).
4349 For the last two cases, we have just exited the loop.
4351 At this point, TYPE is the type of elements of an array,
4352 or for a function to return, or for a pointer to point to.
4353 After this sequence of ifs, TYPE is the type of the
4354 array or function or pointer, and DECLARATOR has had its
4355 outermost layer removed. */
4357 if (array_ptr_quals != NULL_TREE || array_parm_static)
4359 /* Only the innermost declarator (making a parameter be of
4360 array type which is converted to pointer type)
4361 may have static or type qualifiers. */
4362 error ("static or type qualifiers in non-parameter array declarator");
4363 array_ptr_quals = NULL_TREE;
4364 array_parm_static = 0;
4367 if (TREE_CODE (declarator) == TREE_LIST)
4369 /* We encode a declarator with embedded attributes using
4371 tree attrs = TREE_PURPOSE (declarator);
4374 declarator = TREE_VALUE (declarator);
4375 inner_decl = declarator;
4376 while (inner_decl != NULL_TREE
4377 && TREE_CODE (inner_decl) == TREE_LIST)
4378 inner_decl = TREE_VALUE (inner_decl);
4379 if (inner_decl == NULL_TREE
4380 || TREE_CODE (inner_decl) == IDENTIFIER_NODE)
4381 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
4382 if (TREE_CODE (inner_decl) == CALL_EXPR)
4383 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
4384 if (TREE_CODE (inner_decl) == ARRAY_REF)
4385 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
4386 returned_attrs = decl_attributes (&type,
4387 chainon (returned_attrs, attrs),
4390 else if (TREE_CODE (declarator) == ARRAY_REF)
4392 tree itype = NULL_TREE;
4393 tree size = TREE_OPERAND (declarator, 1);
4394 /* The index is a signed object `sizetype' bits wide. */
4395 tree index_type = signed_type (sizetype);
4397 array_ptr_quals = TREE_TYPE (declarator);
4398 array_parm_static = TREE_STATIC (declarator);
4400 declarator = TREE_OPERAND (declarator, 0);
4402 /* Check for some types that there cannot be arrays of. */
4404 if (VOID_TYPE_P (type))
4406 error ("declaration of `%s' as array of voids", name);
4407 type = error_mark_node;
4410 if (TREE_CODE (type) == FUNCTION_TYPE)
4412 error ("declaration of `%s' as array of functions", name);
4413 type = error_mark_node;
4416 if (size == error_mark_node)
4417 type = error_mark_node;
4419 if (type == error_mark_node)
4422 /* If size was specified, set ITYPE to a range-type for that size.
4423 Otherwise, ITYPE remains null. finish_decl may figure it out
4424 from an initial value. */
4428 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4429 STRIP_TYPE_NOPS (size);
4431 if (! INTEGRAL_TYPE_P (TREE_TYPE (size)))
4433 error ("size of array `%s' has non-integer type", name);
4434 size = integer_one_node;
4437 if (pedantic && integer_zerop (size))
4438 pedwarn ("ISO C forbids zero-size array `%s'", name);
4440 if (TREE_CODE (size) == INTEGER_CST)
4442 constant_expression_warning (size);
4443 if (tree_int_cst_sgn (size) < 0)
4445 error ("size of array `%s' is negative", name);
4446 size = integer_one_node;
4451 /* Make sure the array size remains visibly nonconstant
4452 even if it is (eg) a const variable with known value. */
4457 if (TREE_CONSTANT (size))
4458 pedwarn ("ISO C89 forbids array `%s' whose size can't be evaluated",
4461 pedwarn ("ISO C89 forbids variable-size array `%s'",
4466 if (integer_zerop (size))
4468 /* A zero-length array cannot be represented with an
4469 unsigned index type, which is what we'll get with
4470 build_index_type. Create an open-ended range instead. */
4471 itype = build_range_type (sizetype, size, NULL_TREE);
4475 /* Compute the maximum valid index, that is, size - 1.
4476 Do the calculation in index_type, so that if it is
4477 a variable the computations will be done in the
4479 itype = fold (build (MINUS_EXPR, index_type,
4480 convert (index_type, size),
4481 convert (index_type, size_one_node)));
4483 /* If that overflowed, the array is too big.
4484 ??? While a size of INT_MAX+1 technically shouldn't
4485 cause an overflow (because we subtract 1), the overflow
4486 is recorded during the conversion to index_type, before
4487 the subtraction. Handling this case seems like an
4488 unnecessary complication. */
4489 if (TREE_OVERFLOW (itype))
4491 error ("size of array `%s' is too large", name);
4492 type = error_mark_node;
4497 itype = variable_size (itype);
4498 itype = build_index_type (itype);
4501 else if (decl_context == FIELD)
4503 /* ??? Need to check somewhere that this is a structure
4504 and not a union, that this field is last, and that
4505 this structure has at least one other named member. */
4507 if (pedantic && !flag_isoc99 && !in_system_header)
4508 pedwarn ("ISO C89 does not support flexible array members");
4510 /* ISO C99 Flexible array members are effectively identical
4511 to GCC's zero-length array extension. */
4512 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4515 /* If pedantic, complain about arrays of incomplete types. */
4517 if (pedantic && !COMPLETE_TYPE_P (type))
4518 pedwarn ("array type has incomplete element type");
4521 /* We shouldn't have a function type here at all!
4522 Functions aren't allowed as array elements. */
4523 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4524 && (constp || volatilep))
4525 pedwarn ("ISO C forbids const or volatile function types");
4528 /* Build the array type itself, then merge any constancy or
4529 volatility into the target type. We must do it in this order
4530 to ensure that the TYPE_MAIN_VARIANT field of the array type
4531 is set correctly. */
4533 type = build_array_type (type, itype);
4535 type = c_build_qualified_type (type, type_quals);
4538 C_TYPE_VARIABLE_SIZE (type) = 1;
4540 /* The GCC extension for zero-length arrays differs from
4541 ISO flexible array members in that sizeof yields zero. */
4542 if (size && integer_zerop (size))
4545 TYPE_SIZE (type) = bitsize_zero_node;
4546 TYPE_SIZE_UNIT (type) = size_zero_node;
4548 if (decl_context != PARM
4549 && (array_ptr_quals != NULL_TREE || array_parm_static))
4551 error ("static or type qualifiers in non-parameter array declarator");
4552 array_ptr_quals = NULL_TREE;
4553 array_parm_static = 0;
4556 else if (TREE_CODE (declarator) == CALL_EXPR)
4560 /* Declaring a function type.
4561 Make sure we have a valid type for the function to return. */
4562 if (type == error_mark_node)
4567 /* Warn about some types functions can't return. */
4569 if (TREE_CODE (type) == FUNCTION_TYPE)
4571 error ("`%s' declared as function returning a function", name);
4572 type = integer_type_node;
4574 if (TREE_CODE (type) == ARRAY_TYPE)
4576 error ("`%s' declared as function returning an array", name);
4577 type = integer_type_node;
4580 #ifndef TRADITIONAL_RETURN_FLOAT
4581 /* Traditionally, declaring return type float means double. */
4583 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4584 type = double_type_node;
4585 #endif /* TRADITIONAL_RETURN_FLOAT */
4587 /* Construct the function type and go to the next
4588 inner layer of declarator. */
4590 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4592 /* Say it's a definition
4593 only for the CALL_EXPR
4594 closest to the identifier. */
4595 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4596 /* Type qualifiers before the return type of the function
4597 qualify the return type, not the function type. */
4600 /* Type qualifiers on a function return type are normally
4601 permitted by the standard but have no effect, so give a
4602 warning at -W. Qualifiers on a void return type have
4603 meaning as a GNU extension, and are banned on function
4604 definitions in ISO C. FIXME: strictly we shouldn't
4605 pedwarn for qualified void return types except on function
4606 definitions, but not doing so could lead to the undesirable
4607 state of a "volatile void" function return type not being
4608 warned about, and a use of the function being compiled
4609 with GNU semantics, with no diagnostics under -pedantic. */
4610 if (VOID_TYPE_P (type) && pedantic && !in_system_header)
4611 pedwarn ("ISO C forbids qualified void function return type");
4612 else if (extra_warnings
4613 && !(VOID_TYPE_P (type)
4614 && type_quals == TYPE_QUAL_VOLATILE))
4615 warning ("type qualifiers ignored on function return type");
4617 type = c_build_qualified_type (type, type_quals);
4619 type_quals = TYPE_UNQUALIFIED;
4621 type = build_function_type (type, arg_types);
4622 declarator = TREE_OPERAND (declarator, 0);
4624 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4625 the formal parameter list of this FUNCTION_TYPE to point to
4626 the FUNCTION_TYPE node itself. */
4631 for (link = last_function_parm_tags;
4633 link = TREE_CHAIN (link))
4634 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4637 else if (TREE_CODE (declarator) == INDIRECT_REF)
4639 /* Merge any constancy or volatility into the target type
4642 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4644 pedwarn ("ISO C forbids qualified function types");
4646 type = c_build_qualified_type (type, type_quals);
4647 type_quals = TYPE_UNQUALIFIED;
4650 type = build_pointer_type (type);
4652 /* Process a list of type modifier keywords
4653 (such as const or volatile) that were given inside the `*'. */
4655 if (TREE_TYPE (declarator))
4663 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4664 typemodlist = TREE_CHAIN (typemodlist))
4666 tree qualifier = TREE_VALUE (typemodlist);
4668 if (C_IS_RESERVED_WORD (qualifier))
4670 if (C_RID_CODE (qualifier) == RID_CONST)
4672 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4674 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4684 error ("invalid type modifier within pointer declarator");
4685 if (constp > 1 && ! flag_isoc99)
4686 pedwarn ("duplicate `const'");
4687 if (volatilep > 1 && ! flag_isoc99)
4688 pedwarn ("duplicate `volatile'");
4689 if (restrictp > 1 && ! flag_isoc99)
4690 pedwarn ("duplicate `restrict'");
4692 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4693 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4694 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4697 declarator = TREE_OPERAND (declarator, 0);
4704 /* Now TYPE has the actual type. */
4706 /* Did array size calculations overflow? */
4708 if (TREE_CODE (type) == ARRAY_TYPE
4709 && COMPLETE_TYPE_P (type)
4710 && TREE_OVERFLOW (TYPE_SIZE (type)))
4712 error ("size of array `%s' is too large", name);
4713 /* If we proceed with the array type as it is, we'll eventually
4714 crash in tree_low_cst(). */
4715 type = error_mark_node;
4718 /* If this is declaring a typedef name, return a TYPE_DECL. */
4720 if (specbits & (1 << (int) RID_TYPEDEF))
4723 /* Note that the grammar rejects storage classes
4724 in typenames, fields or parameters */
4725 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4727 pedwarn ("ISO C forbids qualified function types");
4729 type = c_build_qualified_type (type, type_quals);
4730 decl = build_decl (TYPE_DECL, declarator, type);
4731 if ((specbits & (1 << (int) RID_SIGNED))
4732 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4733 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4734 decl_attributes (&decl, returned_attrs, 0);
4738 /* Detect the case of an array type of unspecified size
4739 which came, as such, direct from a typedef name.
4740 We must copy the type, so that each identifier gets
4741 a distinct type, so that each identifier's size can be
4742 controlled separately by its own initializer. */
4744 if (type != 0 && typedef_type != 0
4745 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4746 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4748 type = build_array_type (TREE_TYPE (type), 0);
4750 C_TYPE_VARIABLE_SIZE (type) = 1;
4753 /* If this is a type name (such as, in a cast or sizeof),
4754 compute the type and return it now. */
4756 if (decl_context == TYPENAME)
4758 /* Note that the grammar rejects storage classes
4759 in typenames, fields or parameters */
4760 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4762 pedwarn ("ISO C forbids const or volatile function types");
4764 type = c_build_qualified_type (type, type_quals);
4765 decl_attributes (&type, returned_attrs, 0);
4769 /* Aside from typedefs and type names (handle above),
4770 `void' at top level (not within pointer)
4771 is allowed only in public variables.
4772 We don't complain about parms either, but that is because
4773 a better error message can be made later. */
4775 if (VOID_TYPE_P (type) && decl_context != PARM
4776 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4777 && ((specbits & (1 << (int) RID_EXTERN))
4778 || (current_binding_level == global_binding_level
4780 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4782 error ("variable or field `%s' declared void", name);
4783 type = integer_type_node;
4786 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4787 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4792 if (decl_context == PARM)
4794 tree type_as_written;
4797 /* A parameter declared as an array of T is really a pointer to T.
4798 One declared as a function is really a pointer to a function. */
4800 if (TREE_CODE (type) == ARRAY_TYPE)
4802 /* Transfer const-ness of array into that of type pointed to. */
4803 type = TREE_TYPE (type);
4805 type = c_build_qualified_type (type, type_quals);
4806 type = build_pointer_type (type);
4807 type_quals = TYPE_UNQUALIFIED;
4808 if (array_ptr_quals)
4810 tree new_ptr_quals, new_ptr_attrs;
4812 split_specs_attrs (array_ptr_quals, &new_ptr_quals, &new_ptr_attrs);
4813 /* We don't yet implement attributes in this context. */
4814 if (new_ptr_attrs != NULL_TREE)
4815 warning ("attributes in parameter array declarator ignored");
4820 for (; new_ptr_quals; new_ptr_quals = TREE_CHAIN (new_ptr_quals))
4822 tree qualifier = TREE_VALUE (new_ptr_quals);
4824 if (C_IS_RESERVED_WORD (qualifier))
4826 if (C_RID_CODE (qualifier) == RID_CONST)
4828 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4830 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4840 error ("invalid type modifier within array declarator");
4842 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4843 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4844 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4848 else if (TREE_CODE (type) == FUNCTION_TYPE)
4850 if (pedantic && type_quals)
4851 pedwarn ("ISO C forbids qualified function types");
4853 type = c_build_qualified_type (type, type_quals);
4854 type = build_pointer_type (type);
4855 type_quals = TYPE_UNQUALIFIED;
4857 else if (type_quals)
4858 type = c_build_qualified_type (type, type_quals);
4860 type_as_written = type;
4862 decl = build_decl (PARM_DECL, declarator, type);
4864 C_DECL_VARIABLE_SIZE (decl) = 1;
4866 /* Compute the type actually passed in the parmlist,
4867 for the case where there is no prototype.
4868 (For example, shorts and chars are passed as ints.)
4869 When there is a prototype, this is overridden later. */
4871 if (type == error_mark_node)
4872 promoted_type = type;
4875 promoted_type = simple_type_promotes_to (type);
4876 if (! promoted_type)
4877 promoted_type = type;
4880 DECL_ARG_TYPE (decl) = promoted_type;
4881 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4883 else if (decl_context == FIELD)
4885 /* Structure field. It may not be a function. */
4887 if (TREE_CODE (type) == FUNCTION_TYPE)
4889 error ("field `%s' declared as a function", name);
4890 type = build_pointer_type (type);
4892 else if (TREE_CODE (type) != ERROR_MARK
4893 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4895 error ("field `%s' has incomplete type", name);
4896 type = error_mark_node;
4898 /* Move type qualifiers down to element of an array. */
4899 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4901 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4903 TYPE_DOMAIN (type));
4905 /* Leave the field const or volatile as well. */
4906 type_quals = TYPE_UNQUALIFIED;
4909 decl = build_decl (FIELD_DECL, declarator, type);
4910 DECL_NONADDRESSABLE_P (decl) = bitfield;
4913 C_DECL_VARIABLE_SIZE (decl) = 1;
4915 else if (TREE_CODE (type) == FUNCTION_TYPE)
4917 /* Every function declaration is "external"
4918 except for those which are inside a function body
4919 in which `auto' is used.
4920 That is a case not specified by ANSI C,
4921 and we use it for forward declarations for nested functions. */
4922 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4923 || current_binding_level == global_binding_level);
4925 if (specbits & (1 << (int) RID_AUTO)
4926 && (pedantic || current_binding_level == global_binding_level))
4927 pedwarn ("invalid storage class for function `%s'", name);
4928 if (specbits & (1 << (int) RID_REGISTER))
4929 error ("invalid storage class for function `%s'", name);
4930 /* Function declaration not at top level.
4931 Storage classes other than `extern' are not allowed
4932 and `extern' makes no difference. */
4933 if (current_binding_level != global_binding_level
4934 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4936 pedwarn ("invalid storage class for function `%s'", name);
4938 decl = build_decl (FUNCTION_DECL, declarator, type);
4939 decl = build_decl_attribute_variant (decl, decl_attr);
4941 DECL_LANG_SPECIFIC (decl) = (struct lang_decl *)
4942 ggc_alloc_cleared (sizeof (struct lang_decl));
4944 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4945 pedwarn ("ISO C forbids qualified function types");
4947 /* GNU C interprets a `volatile void' return type to indicate
4948 that the function does not return. */
4949 if ((type_quals & TYPE_QUAL_VOLATILE)
4950 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4951 warning ("`noreturn' function returns non-void value");
4954 DECL_EXTERNAL (decl) = 1;
4955 /* Record absence of global scope for `static' or `auto'. */
4957 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4959 /* Record presence of `inline', if it is reasonable. */
4960 if (MAIN_NAME_P (declarator))
4963 warning ("cannot inline function `main'");
4967 /* Assume that otherwise the function can be inlined. */
4968 DECL_INLINE (decl) = 1;
4969 DECL_DECLARED_INLINE_P (decl) = 1;
4971 if (specbits & (1 << (int) RID_EXTERN))
4972 current_extern_inline = 1;
4974 /* If -finline-functions, assume it can be inlined. This does
4975 two things: let the function be deferred until it is actually
4976 needed, and let dwarf2 know that the function is inlinable. */
4977 else if (flag_inline_trees == 2)
4979 DECL_INLINE (decl) = 1;
4980 DECL_DECLARED_INLINE_P (decl) = 0;
4985 /* It's a variable. */
4986 /* An uninitialized decl with `extern' is a reference. */
4987 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4989 /* Move type qualifiers down to element of an array. */
4990 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4992 int saved_align = TYPE_ALIGN(type);
4993 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4995 TYPE_DOMAIN (type));
4996 TYPE_ALIGN (type) = saved_align;
4997 #if 0 /* Leave the variable const or volatile as well. */
4998 type_quals = TYPE_UNQUALIFIED;
5001 else if (type_quals)
5002 type = c_build_qualified_type (type, type_quals);
5004 decl = build_decl (VAR_DECL, declarator, type);
5006 C_DECL_VARIABLE_SIZE (decl) = 1;
5009 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
5011 DECL_EXTERNAL (decl) = extern_ref;
5012 /* At top level, the presence of a `static' or `register' storage
5013 class specifier, or the absence of all storage class specifiers
5014 makes this declaration a definition (perhaps tentative). Also,
5015 the absence of both `static' and `register' makes it public. */
5016 if (current_binding_level == global_binding_level)
5020 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
5021 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
5023 /* Not at top level, only `static' makes a static definition. */
5026 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
5027 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
5031 /* Record `register' declaration for warnings on &
5032 and in case doing stupid register allocation. */
5034 if (specbits & (1 << (int) RID_REGISTER))
5035 DECL_REGISTER (decl) = 1;
5037 /* Record constancy and volatility. */
5038 c_apply_type_quals_to_decl (type_quals, decl);
5040 /* If a type has volatile components, it should be stored in memory.
5041 Otherwise, the fact that those components are volatile
5042 will be ignored, and would even crash the compiler. */
5043 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
5044 mark_addressable (decl);
5046 decl_attributes (&decl, returned_attrs, 0);
5052 /* Decode the parameter-list info for a function type or function definition.
5053 The argument is the value returned by `get_parm_info' (or made in parse.y
5054 if there is an identifier list instead of a parameter decl list).
5055 These two functions are separate because when a function returns
5056 or receives functions then each is called multiple times but the order
5057 of calls is different. The last call to `grokparms' is always the one
5058 that contains the formal parameter names of a function definition.
5060 Store in `last_function_parms' a chain of the decls of parms.
5061 Also store in `last_function_parm_tags' a chain of the struct, union,
5062 and enum tags declared among the parms.
5064 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5066 FUNCDEF_FLAG is nonzero for a function definition, 0 for
5067 a mere declaration. A nonempty identifier-list gets an error message
5068 when FUNCDEF_FLAG is zero. */
5071 grokparms (parms_info, funcdef_flag)
5075 tree first_parm = TREE_CHAIN (parms_info);
5077 last_function_parms = TREE_PURPOSE (parms_info);
5078 last_function_parm_tags = TREE_VALUE (parms_info);
5080 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
5081 && !in_system_header)
5082 warning ("function declaration isn't a prototype");
5085 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
5088 pedwarn ("parameter names (without types) in function declaration");
5090 last_function_parms = first_parm;
5097 /* We no longer test FUNCDEF_FLAG.
5098 If the arg types are incomplete in a declaration,
5099 they must include undefined tags.
5100 These tags can never be defined in the scope of the declaration,
5101 so the types can never be completed,
5102 and no call can be compiled successfully. */
5104 /* In a fcn definition, arg types must be complete. */
5107 for (parm = last_function_parms, typelt = first_parm;
5109 parm = TREE_CHAIN (parm))
5110 /* Skip over any enumeration constants declared here. */
5111 if (TREE_CODE (parm) == PARM_DECL)
5113 /* Barf if the parameter itself has an incomplete type. */
5114 tree type = TREE_VALUE (typelt);
5115 if (type == error_mark_node)
5117 if (!COMPLETE_TYPE_P (type))
5119 if (funcdef_flag && DECL_NAME (parm) != 0)
5120 error ("parameter `%s' has incomplete type",
5121 IDENTIFIER_POINTER (DECL_NAME (parm)));
5123 warning ("parameter has incomplete type");
5126 TREE_VALUE (typelt) = error_mark_node;
5127 TREE_TYPE (parm) = error_mark_node;
5131 /* This has been replaced by parm_tags_warning, which
5132 uses a more accurate criterion for what to warn
5136 /* Now warn if is a pointer to an incomplete type. */
5137 while (TREE_CODE (type) == POINTER_TYPE
5138 || TREE_CODE (type) == REFERENCE_TYPE)
5139 type = TREE_TYPE (type);
5140 type = TYPE_MAIN_VARIANT (type);
5141 if (!COMPLETE_TYPE_P (type))
5143 if (DECL_NAME (parm) != 0)
5144 warning ("parameter `%s' points to incomplete type",
5145 IDENTIFIER_POINTER (DECL_NAME (parm)));
5147 warning ("parameter points to incomplete type");
5151 typelt = TREE_CHAIN (typelt);
5158 /* Return a tree_list node with info on a parameter list just parsed.
5159 The TREE_PURPOSE is a chain of decls of those parms.
5160 The TREE_VALUE is a list of structure, union and enum tags defined.
5161 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5162 This tree_list node is later fed to `grokparms'.
5164 VOID_AT_END nonzero means append `void' to the end of the type-list.
5165 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5168 get_parm_info (void_at_end)
5174 tree tags = gettags ();
5175 tree parms = getdecls ();
5177 tree order = current_binding_level->parm_order;
5179 /* Just `void' (and no ellipsis) is special. There are really no parms.
5180 But if the `void' is qualified (by `const' or `volatile') or has a
5181 storage class specifier (`register'), then the behavior is undefined;
5182 by not counting it as the special case of `void' we will cause an
5183 error later. Typedefs for `void' are OK (see DR#157). */
5184 if (void_at_end && parms != 0
5185 && TREE_CHAIN (parms) == 0
5186 && VOID_TYPE_P (TREE_TYPE (parms))
5187 && ! TREE_THIS_VOLATILE (parms)
5188 && ! TREE_READONLY (parms)
5189 && ! DECL_REGISTER (parms)
5190 && DECL_NAME (parms) == 0)
5193 storedecls (NULL_TREE);
5194 return tree_cons (NULL_TREE, NULL_TREE,
5195 tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5198 /* Extract enumerator values and other non-parms declared with the parms.
5199 Likewise any forward parm decls that didn't have real parm decls. */
5200 for (decl = parms; decl;)
5202 tree next = TREE_CHAIN (decl);
5204 if (TREE_CODE (decl) != PARM_DECL)
5206 TREE_CHAIN (decl) = new_parms;
5209 else if (TREE_ASM_WRITTEN (decl))
5211 error_with_decl (decl,
5212 "parameter `%s' has just a forward declaration");
5213 TREE_CHAIN (decl) = new_parms;
5219 /* Put the parm decls back in the order they were in in the parm list. */
5220 for (t = order; t; t = TREE_CHAIN (t))
5223 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5225 TREE_CHAIN (TREE_VALUE (t)) = 0;
5228 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5231 /* Store the parmlist in the binding level since the old one
5232 is no longer a valid list. (We have changed the chain pointers.) */
5233 storedecls (new_parms);
5235 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5236 /* There may also be declarations for enumerators if an enumeration
5237 type is declared among the parms. Ignore them here. */
5238 if (TREE_CODE (decl) == PARM_DECL)
5240 /* Since there is a prototype,
5241 args are passed in their declared types. */
5242 tree type = TREE_TYPE (decl);
5243 DECL_ARG_TYPE (decl) = type;
5244 if (PROMOTE_PROTOTYPES
5245 && INTEGRAL_TYPE_P (type)
5246 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5247 DECL_ARG_TYPE (decl) = integer_type_node;
5249 types = tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5250 if (VOID_TYPE_P (TREE_VALUE (types)) && ! erred
5251 && DECL_NAME (decl) == 0)
5253 error ("`void' in parameter list must be the entire list");
5259 return tree_cons (new_parms, tags,
5260 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
5262 return tree_cons (new_parms, tags, nreverse (types));
5265 /* At end of parameter list, warn about any struct, union or enum tags
5266 defined within. Do so because these types cannot ever become complete. */
5269 parmlist_tags_warning ()
5274 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5276 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5277 /* An anonymous union parm type is meaningful as a GNU extension.
5278 So don't warn for that. */
5279 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5281 if (TREE_PURPOSE (elt) != 0)
5283 if (code == RECORD_TYPE)
5284 warning ("`struct %s' declared inside parameter list",
5285 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5286 else if (code == UNION_TYPE)
5287 warning ("`union %s' declared inside parameter list",
5288 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5290 warning ("`enum %s' declared inside parameter list",
5291 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5295 /* For translation these need to be separate warnings */
5296 if (code == RECORD_TYPE)
5297 warning ("anonymous struct declared inside parameter list");
5298 else if (code == UNION_TYPE)
5299 warning ("anonymous union declared inside parameter list");
5301 warning ("anonymous enum declared inside parameter list");
5305 warning ("its scope is only this definition or declaration, which is probably not what you want");
5311 /* Get the struct, enum or union (CODE says which) with tag NAME.
5312 Define the tag as a forward-reference if it is not defined. */
5315 xref_tag (code, name)
5316 enum tree_code code;
5319 /* If a cross reference is requested, look up the type
5320 already defined for this tag and return it. */
5322 tree ref = lookup_tag (code, name, current_binding_level, 0);
5323 /* If this is the right type of tag, return what we found.
5324 (This reference will be shadowed by shadow_tag later if appropriate.)
5325 If this is the wrong type of tag, do not return it. If it was the
5326 wrong type in the same binding level, we will have had an error
5327 message already; if in a different binding level and declaring
5328 a name, pending_xref_error will give an error message; but if in a
5329 different binding level and not declaring a name, this tag should
5330 shadow the previous declaration of a different type of tag, and
5331 this would not work properly if we return the reference found.
5332 (For example, with "struct foo" in an outer scope, "union foo;"
5333 must shadow that tag with a new one of union type.) */
5334 if (ref && TREE_CODE (ref) == code)
5337 /* If no such tag is yet defined, create a forward-reference node
5338 and record it as the "definition".
5339 When a real declaration of this type is found,
5340 the forward-reference will be altered into a real type. */
5342 ref = make_node (code);
5343 if (code == ENUMERAL_TYPE)
5345 /* Give the type a default layout like unsigned int
5346 to avoid crashing if it does not get defined. */
5347 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5348 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5349 TYPE_USER_ALIGN (ref) = 0;
5350 TREE_UNSIGNED (ref) = 1;
5351 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5352 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5353 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5356 pushtag (name, ref);
5361 /* Make sure that the tag NAME is defined *in the current binding level*
5362 at least as a forward reference.
5363 CODE says which kind of tag NAME ought to be. */
5366 start_struct (code, name)
5367 enum tree_code code;
5370 /* If there is already a tag defined at this binding level
5371 (as a forward reference), just return it. */
5376 ref = lookup_tag (code, name, current_binding_level, 1);
5377 if (ref && TREE_CODE (ref) == code)
5379 C_TYPE_BEING_DEFINED (ref) = 1;
5380 TYPE_PACKED (ref) = flag_pack_struct;
5381 if (TYPE_FIELDS (ref))
5383 if (code == UNION_TYPE)
5384 error ("redefinition of `union %s'",
5385 IDENTIFIER_POINTER (name));
5387 error ("redefinition of `struct %s'",
5388 IDENTIFIER_POINTER (name));
5394 /* Otherwise create a forward-reference just so the tag is in scope. */
5396 ref = make_node (code);
5397 pushtag (name, ref);
5398 C_TYPE_BEING_DEFINED (ref) = 1;
5399 TYPE_PACKED (ref) = flag_pack_struct;
5403 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5404 of a structure component, returning a FIELD_DECL node.
5405 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5407 This is done during the parsing of the struct declaration.
5408 The FIELD_DECL nodes are chained together and the lot of them
5409 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5412 grokfield (filename, line, declarator, declspecs, width)
5413 const char *filename ATTRIBUTE_UNUSED;
5414 int line ATTRIBUTE_UNUSED;
5415 tree declarator, declspecs, width;
5419 if (declarator == NULL_TREE && width == NULL_TREE)
5421 /* This is an unnamed decl. We only support unnamed
5422 structs/unions, so check for other things and refuse them. */
5423 if (TREE_CODE (TREE_VALUE (declspecs)) != RECORD_TYPE
5424 && TREE_CODE (TREE_VALUE (declspecs)) != UNION_TYPE)
5426 error ("unnamed fields of type other than struct or union are not allowed");
5431 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5433 finish_decl (value, NULL_TREE, NULL_TREE);
5434 DECL_INITIAL (value) = width;
5436 maybe_objc_check_decl (value);
5440 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5441 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5442 ATTRIBUTES are attributes to be applied to the structure. */
5445 finish_struct (t, fieldlist, attributes)
5451 int toplevel = global_binding_level == current_binding_level;
5452 int saw_named_field;
5454 /* If this type was previously laid out as a forward reference,
5455 make sure we lay it out again. */
5459 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5461 /* Nameless union parm types are useful as GCC extension. */
5462 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5463 /* Otherwise, warn about any struct or union def. in parmlist. */
5464 if (in_parm_level_p ())
5467 pedwarn ("%s defined inside parms",
5468 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5469 else if (! flag_traditional)
5470 warning ("%s defined inside parms",
5471 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5476 for (x = fieldlist; x; x = TREE_CHAIN (x))
5477 if (DECL_NAME (x) != 0)
5481 pedwarn ("%s has no %s",
5482 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
5483 fieldlist ? _("named members") : _("members"));
5486 /* Install struct as DECL_CONTEXT of each field decl.
5487 Also process specified field sizes,m which is found in the DECL_INITIAL.
5488 Store 0 there, except for ": 0" fields (so we can find them
5489 and delete them, below). */
5491 saw_named_field = 0;
5492 for (x = fieldlist; x; x = TREE_CHAIN (x))
5494 DECL_CONTEXT (x) = t;
5495 DECL_PACKED (x) |= TYPE_PACKED (t);
5497 /* If any field is const, the structure type is pseudo-const. */
5498 if (TREE_READONLY (x))
5499 C_TYPE_FIELDS_READONLY (t) = 1;
5502 /* A field that is pseudo-const makes the structure likewise. */
5503 tree t1 = TREE_TYPE (x);
5504 while (TREE_CODE (t1) == ARRAY_TYPE)
5505 t1 = TREE_TYPE (t1);
5506 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5507 && C_TYPE_FIELDS_READONLY (t1))
5508 C_TYPE_FIELDS_READONLY (t) = 1;
5511 /* Any field that is volatile means variables of this type must be
5512 treated in some ways as volatile. */
5513 if (TREE_THIS_VOLATILE (x))
5514 C_TYPE_FIELDS_VOLATILE (t) = 1;
5516 /* Any field of nominal variable size implies structure is too. */
5517 if (C_DECL_VARIABLE_SIZE (x))
5518 C_TYPE_VARIABLE_SIZE (t) = 1;
5520 /* Detect invalid nested redefinition. */
5521 if (TREE_TYPE (x) == t)
5522 error ("nested redefinition of `%s'",
5523 IDENTIFIER_POINTER (TYPE_NAME (t)));
5525 /* Detect invalid bit-field size. */
5526 if (DECL_INITIAL (x))
5527 STRIP_NOPS (DECL_INITIAL (x));
5528 if (DECL_INITIAL (x))
5530 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5531 constant_expression_warning (DECL_INITIAL (x));
5535 "bit-field `%s' width not an integer constant");
5536 DECL_INITIAL (x) = NULL;
5540 /* Detect invalid bit-field type. */
5541 if (DECL_INITIAL (x)
5542 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5543 && TREE_CODE (TREE_TYPE (x)) != BOOLEAN_TYPE
5544 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5546 error_with_decl (x, "bit-field `%s' has invalid type");
5547 DECL_INITIAL (x) = NULL;
5550 if (DECL_INITIAL (x) && pedantic
5551 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5552 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5553 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != c_bool_type_node
5554 /* Accept an enum that's equivalent to int or unsigned int. */
5555 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5556 && (TYPE_PRECISION (TREE_TYPE (x))
5557 == TYPE_PRECISION (integer_type_node))))
5558 pedwarn_with_decl (x, "bit-field `%s' type invalid in ISO C");
5560 /* Detect and ignore out of range field width and process valid
5562 if (DECL_INITIAL (x))
5565 if (TYPE_MAIN_VARIANT (TREE_TYPE (x)) == c_bool_type_node)
5566 max_width = CHAR_TYPE_SIZE;
5568 max_width = TYPE_PRECISION (TREE_TYPE (x));
5569 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5570 error_with_decl (x, "negative width in bit-field `%s'");
5571 else if (0 < compare_tree_int (DECL_INITIAL (x), max_width))
5572 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5573 else if (integer_zerop (DECL_INITIAL (x)) && DECL_NAME (x) != 0)
5574 error_with_decl (x, "zero width for bit-field `%s'");
5577 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
5578 unsigned HOST_WIDE_INT width
5579 = TREE_INT_CST_LOW (DECL_INITIAL (x));
5581 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5582 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5583 TREE_UNSIGNED (TREE_TYPE (x)))
5585 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5586 TREE_UNSIGNED (TREE_TYPE (x))))))
5587 warning_with_decl (x,
5588 "`%s' is narrower than values of its type");
5590 DECL_SIZE (x) = bitsize_int (width);
5591 DECL_BIT_FIELD (x) = 1;
5592 SET_DECL_C_BIT_FIELD (x);
5596 /* field size 0 => force desired amount of alignment. */
5597 #ifdef EMPTY_FIELD_BOUNDARY
5598 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5600 #ifdef PCC_BITFIELD_TYPE_MATTERS
5601 if (PCC_BITFIELD_TYPE_MATTERS)
5603 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5604 TYPE_ALIGN (TREE_TYPE (x)));
5605 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5612 else if (TREE_TYPE (x) != error_mark_node)
5614 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5615 : TYPE_ALIGN (TREE_TYPE (x)));
5617 /* Non-bit-fields are aligned for their type, except packed
5618 fields which require only BITS_PER_UNIT alignment. */
5619 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5620 if (! DECL_PACKED (x))
5621 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5624 DECL_INITIAL (x) = 0;
5626 /* Detect flexible array member in an invalid context. */
5627 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5628 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5629 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5630 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5632 if (TREE_CODE (t) == UNION_TYPE)
5633 error_with_decl (x, "flexible array member in union");
5634 else if (TREE_CHAIN (x) != NULL_TREE)
5635 error_with_decl (x, "flexible array member not at end of struct");
5636 else if (! saw_named_field)
5637 error_with_decl (x, "flexible array member in otherwise empty struct");
5640 saw_named_field = 1;
5643 /* Delete all duplicate fields from the fieldlist */
5644 for (x = fieldlist; x && TREE_CHAIN (x);)
5645 /* Anonymous fields aren't duplicates. */
5646 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5654 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5660 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5662 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5663 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5669 /* Now we have the nearly final fieldlist. Record it,
5670 then lay out the structure or union (including the fields). */
5672 TYPE_FIELDS (t) = fieldlist;
5676 /* Delete all zero-width bit-fields from the fieldlist */
5678 tree *fieldlistp = &fieldlist;
5680 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5681 *fieldlistp = TREE_CHAIN (*fieldlistp);
5683 fieldlistp = &TREE_CHAIN (*fieldlistp);
5686 /* Now we have the truly final field list.
5687 Store it in this type and in the variants. */
5689 TYPE_FIELDS (t) = fieldlist;
5691 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5693 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5694 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5695 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5696 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5699 /* If this was supposed to be a transparent union, but we can't
5700 make it one, warn and turn off the flag. */
5701 if (TREE_CODE (t) == UNION_TYPE
5702 && TYPE_TRANSPARENT_UNION (t)
5703 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5705 TYPE_TRANSPARENT_UNION (t) = 0;
5706 warning ("union cannot be made transparent");
5709 /* If this structure or union completes the type of any previous
5710 variable declaration, lay it out and output its rtl. */
5712 if (current_binding_level->n_incomplete != 0)
5715 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5717 if (TYPE_MAIN_VARIANT (TREE_TYPE (decl)) == TYPE_MAIN_VARIANT (t)
5718 && TREE_CODE (decl) != TYPE_DECL)
5720 layout_decl (decl, 0);
5721 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5722 maybe_objc_check_decl (decl);
5723 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5726 --current_binding_level->n_incomplete;
5728 else if (!COMPLETE_TYPE_P (TREE_TYPE (decl))
5729 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5731 tree element = TREE_TYPE (decl);
5732 while (TREE_CODE (element) == ARRAY_TYPE)
5733 element = TREE_TYPE (element);
5735 layout_array_type (TREE_TYPE (decl));
5740 /* Finish debugging output for this type. */
5741 rest_of_type_compilation (t, toplevel);
5746 /* Lay out the type T, and its element type, and so on. */
5749 layout_array_type (t)
5752 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5753 layout_array_type (TREE_TYPE (t));
5757 /* Begin compiling the definition of an enumeration type.
5758 NAME is its name (or null if anonymous).
5759 Returns the type object, as yet incomplete.
5760 Also records info about it so that build_enumerator
5761 may be used to declare the individual values as they are read. */
5769 /* If this is the real definition for a previous forward reference,
5770 fill in the contents in the same object that used to be the
5771 forward reference. */
5774 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5776 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5778 enumtype = make_node (ENUMERAL_TYPE);
5779 pushtag (name, enumtype);
5782 C_TYPE_BEING_DEFINED (enumtype) = 1;
5784 if (TYPE_VALUES (enumtype) != 0)
5786 /* This enum is a named one that has been declared already. */
5787 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5789 /* Completely replace its old definition.
5790 The old enumerators remain defined, however. */
5791 TYPE_VALUES (enumtype) = 0;
5794 enum_next_value = integer_zero_node;
5797 if (flag_short_enums)
5798 TYPE_PACKED (enumtype) = 1;
5803 /* After processing and defining all the values of an enumeration type,
5804 install their decls in the enumeration type and finish it off.
5805 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5806 and ATTRIBUTES are the specified attributes.
5807 Returns ENUMTYPE. */
5810 finish_enum (enumtype, values, attributes)
5816 tree minnode = 0, maxnode = 0, enum_value_type;
5817 int precision, unsign;
5818 int toplevel = (global_binding_level == current_binding_level);
5820 if (in_parm_level_p ())
5821 warning ("enum defined inside parms");
5823 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5825 /* Calculate the maximum value of any enumerator in this type. */
5827 if (values == error_mark_node)
5828 minnode = maxnode = integer_zero_node;
5831 minnode = maxnode = TREE_VALUE (values);
5832 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5834 tree value = TREE_VALUE (pair);
5835 if (tree_int_cst_lt (maxnode, value))
5837 if (tree_int_cst_lt (value, minnode))
5842 /* Construct the final type of this enumeration. It is the same
5843 as one of the integral types - the narrowest one that fits, except
5844 that normally we only go as narrow as int - and signed iff any of
5845 the values are negative. */
5846 unsign = (tree_int_cst_sgn (minnode) >= 0);
5847 precision = MAX (min_precision (minnode, unsign),
5848 min_precision (maxnode, unsign));
5849 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5851 tree narrowest = type_for_size (precision, unsign);
5854 warning ("enumeration values exceed range of largest integer");
5855 narrowest = long_long_integer_type_node;
5858 precision = TYPE_PRECISION (narrowest);
5861 precision = TYPE_PRECISION (integer_type_node);
5863 if (precision == TYPE_PRECISION (integer_type_node))
5864 enum_value_type = type_for_size (precision, 0);
5866 enum_value_type = enumtype;
5868 TYPE_MIN_VALUE (enumtype) = minnode;
5869 TYPE_MAX_VALUE (enumtype) = maxnode;
5870 TYPE_PRECISION (enumtype) = precision;
5871 TREE_UNSIGNED (enumtype) = unsign;
5872 TYPE_SIZE (enumtype) = 0;
5873 layout_type (enumtype);
5875 if (values != error_mark_node)
5877 /* Change the type of the enumerators to be the enum type. We
5878 need to do this irrespective of the size of the enum, for
5879 proper type checking. Replace the DECL_INITIALs of the
5880 enumerators, and the value slots of the list, with copies
5881 that have the enum type; they cannot be modified in place
5882 because they may be shared (e.g. integer_zero_node) Finally,
5883 change the purpose slots to point to the names of the decls. */
5884 for (pair = values; pair; pair = TREE_CHAIN (pair))
5886 tree enu = TREE_PURPOSE (pair);
5888 TREE_TYPE (enu) = enumtype;
5889 DECL_SIZE (enu) = TYPE_SIZE (enumtype);
5890 DECL_SIZE_UNIT (enu) = TYPE_SIZE_UNIT (enumtype);
5891 DECL_ALIGN (enu) = TYPE_ALIGN (enumtype);
5892 DECL_USER_ALIGN (enu) = TYPE_USER_ALIGN (enumtype);
5893 DECL_MODE (enu) = TYPE_MODE (enumtype);
5895 /* The ISO C Standard mandates enumerators to have type int,
5896 even though the underlying type of an enum type is
5897 unspecified. Here we convert any enumerators that fit in
5898 an int to type int, to avoid promotions to unsigned types
5899 when comparing integers with enumerators that fit in the
5900 int range. When -pedantic is given, build_enumerator()
5901 would have already taken care of those that don't fit. */
5902 if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
5903 DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
5905 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5907 TREE_PURPOSE (pair) = DECL_NAME (enu);
5908 TREE_VALUE (pair) = DECL_INITIAL (enu);
5911 TYPE_VALUES (enumtype) = values;
5914 /* Fix up all variant types of this enum type. */
5915 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5917 if (tem == enumtype)
5919 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5920 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5921 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5922 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5923 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5924 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5925 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5926 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5927 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5928 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5931 /* Finish debugging output for this type. */
5932 rest_of_type_compilation (enumtype, toplevel);
5937 /* Build and install a CONST_DECL for one value of the
5938 current enumeration type (one that was begun with start_enum).
5939 Return a tree-list containing the CONST_DECL and its value.
5940 Assignment of sequential values by default is handled here. */
5943 build_enumerator (name, value)
5948 /* Validate and default VALUE. */
5950 /* Remove no-op casts from the value. */
5952 STRIP_TYPE_NOPS (value);
5956 if (TREE_CODE (value) == INTEGER_CST)
5958 value = default_conversion (value);
5959 constant_expression_warning (value);
5963 error ("enumerator value for `%s' not integer constant",
5964 IDENTIFIER_POINTER (name));
5969 /* Default based on previous value. */
5970 /* It should no longer be possible to have NON_LVALUE_EXPR
5974 value = enum_next_value;
5976 error ("overflow in enumeration values");
5979 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5981 pedwarn ("ISO C restricts enumerator values to range of `int'");
5982 value = convert (integer_type_node, value);
5985 /* Set basis for default for next value. */
5986 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5987 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5989 /* Now create a declaration for the enum value name. */
5991 type = TREE_TYPE (value);
5992 type = type_for_size (MAX (TYPE_PRECISION (type),
5993 TYPE_PRECISION (integer_type_node)),
5995 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
5996 && TREE_UNSIGNED (type)));
5998 decl = build_decl (CONST_DECL, name, type);
5999 DECL_INITIAL (decl) = convert (type, value);
6002 return tree_cons (decl, value, NULL_TREE);
6006 /* Create the FUNCTION_DECL for a function definition.
6007 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
6008 the declaration; they describe the function's name and the type it returns,
6009 but twisted together in a fashion that parallels the syntax of C.
6011 This function creates a binding context for the function body
6012 as well as setting up the FUNCTION_DECL in current_function_decl.
6014 Returns 1 on success. If the DECLARATOR is not suitable for a function
6015 (it defines a datum instead), we return 0, which tells
6016 yyparse to report a parse error. */
6019 start_function (declspecs, declarator, attributes)
6020 tree declarator, declspecs, attributes;
6022 tree decl1, old_decl;
6024 int old_immediate_size_expand = immediate_size_expand;
6026 current_function_returns_value = 0; /* Assume, until we see it does. */
6027 current_function_returns_null = 0;
6028 warn_about_return_type = 0;
6029 current_extern_inline = 0;
6030 c_function_varargs = 0;
6032 shadowed_labels = 0;
6034 /* Don't expand any sizes in the return type of the function. */
6035 immediate_size_expand = 0;
6037 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
6039 /* If the declarator is not suitable for a function definition,
6040 cause a syntax error. */
6043 immediate_size_expand = old_immediate_size_expand;
6047 decl_attributes (&decl1, attributes, 0);
6049 if (DECL_DECLARED_INLINE_P (decl1)
6050 && DECL_UNINLINABLE (decl1)
6051 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
6052 warning_with_decl (decl1,
6053 "inline function `%s' given attribute noinline");
6055 announce_function (decl1);
6057 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
6059 error ("return type is an incomplete type");
6060 /* Make it return void instead. */
6062 = build_function_type (void_type_node,
6063 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
6066 if (warn_about_return_type)
6067 pedwarn_c99 ("return type defaults to `int'");
6069 /* Save the parm names or decls from this function's declarator
6070 where store_parm_decls will find them. */
6071 current_function_parms = last_function_parms;
6072 current_function_parm_tags = last_function_parm_tags;
6074 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6075 error_mark_node is replaced below (in poplevel) with the BLOCK. */
6076 DECL_INITIAL (decl1) = error_mark_node;
6078 /* If this definition isn't a prototype and we had a prototype declaration
6079 before, copy the arg type info from that prototype.
6080 But not if what we had before was a builtin function. */
6081 old_decl = lookup_name_current_level (DECL_NAME (decl1));
6082 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
6083 && !DECL_BUILT_IN (old_decl)
6084 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6085 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
6086 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
6088 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
6089 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
6090 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
6093 /* If there is no explicit declaration, look for any out-of-scope implicit
6096 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
6098 /* Optionally warn of old-fashioned def with no previous prototype. */
6099 if (warn_strict_prototypes
6100 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6102 && (TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0
6103 || (DECL_BUILT_IN (old_decl)
6104 && ! C_DECL_ANTICIPATED (old_decl)))))
6105 warning ("function declaration isn't a prototype");
6106 /* Optionally warn of any global def with no previous prototype. */
6107 else if (warn_missing_prototypes
6108 && TREE_PUBLIC (decl1)
6110 && (TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0
6111 || (DECL_BUILT_IN (old_decl)
6112 && ! C_DECL_ANTICIPATED (old_decl))))
6113 && ! MAIN_NAME_P (DECL_NAME (decl1)))
6114 warning_with_decl (decl1, "no previous prototype for `%s'");
6115 /* Optionally warn of any def with no previous prototype
6116 if the function has already been used. */
6117 else if (warn_missing_prototypes
6118 && old_decl != 0 && TREE_USED (old_decl)
6119 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6120 warning_with_decl (decl1,
6121 "`%s' was used with no prototype before its definition");
6122 /* Optionally warn of any global def with no previous declaration. */
6123 else if (warn_missing_declarations
6124 && TREE_PUBLIC (decl1)
6126 && ! MAIN_NAME_P (DECL_NAME (decl1)))
6127 warning_with_decl (decl1, "no previous declaration for `%s'");
6128 /* Optionally warn of any def with no previous declaration
6129 if the function has already been used. */
6130 else if (warn_missing_declarations
6131 && old_decl != 0 && TREE_USED (old_decl)
6132 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
6133 warning_with_decl (decl1,
6134 "`%s' was used with no declaration before its definition");
6136 /* This is a definition, not a reference.
6137 So normally clear DECL_EXTERNAL.
6138 However, `extern inline' acts like a declaration
6139 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6140 DECL_EXTERNAL (decl1) = current_extern_inline;
6142 /* This function exists in static storage.
6143 (This does not mean `static' in the C sense!) */
6144 TREE_STATIC (decl1) = 1;
6146 /* A nested function is not global. */
6147 if (current_function_decl != 0)
6148 TREE_PUBLIC (decl1) = 0;
6150 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6151 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
6156 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6157 != integer_type_node)
6158 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
6160 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
6161 args = TREE_CHAIN (args))
6163 tree type = args ? TREE_VALUE (args) : 0;
6165 if (type == void_type_node)
6172 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6173 pedwarn_with_decl (decl1,
6174 "first argument of `%s' should be `int'");
6178 if (TREE_CODE (type) != POINTER_TYPE
6179 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6180 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6182 pedwarn_with_decl (decl1,
6183 "second argument of `%s' should be `char **'");
6187 if (TREE_CODE (type) != POINTER_TYPE
6188 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6189 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6191 pedwarn_with_decl (decl1,
6192 "third argument of `%s' should probably be `char **'");
6197 /* It is intentional that this message does not mention the third
6198 argument because it's only mentioned in an appendix of the
6200 if (argct > 0 && (argct < 2 || argct > 3))
6201 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
6203 if (! TREE_PUBLIC (decl1))
6204 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
6207 /* Record the decl so that the function name is defined.
6208 If we already have a decl for this name, and it is a FUNCTION_DECL,
6209 use the old decl. */
6211 current_function_decl = pushdecl (decl1);
6214 declare_parm_level (1);
6215 current_binding_level->subblocks_tag_transparent = 1;
6217 make_decl_rtl (current_function_decl, NULL);
6219 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6220 /* Promote the value to int before returning it. */
6221 if (c_promoting_integer_type_p (restype))
6223 /* It retains unsignedness if traditional
6224 or if not really getting wider. */
6225 if (TREE_UNSIGNED (restype)
6226 && (flag_traditional
6227 || (TYPE_PRECISION (restype)
6228 == TYPE_PRECISION (integer_type_node))))
6229 restype = unsigned_type_node;
6231 restype = integer_type_node;
6233 DECL_RESULT (current_function_decl)
6234 = build_decl (RESULT_DECL, NULL_TREE, restype);
6236 /* If this fcn was already referenced via a block-scope `extern' decl
6237 (or an implicit decl), propagate certain information about the usage. */
6238 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6239 TREE_ADDRESSABLE (current_function_decl) = 1;
6241 immediate_size_expand = old_immediate_size_expand;
6243 start_fname_decls ();
6248 /* Record that this function is going to be a varargs function.
6249 This is called before store_parm_decls, which is too early
6250 to call mark_varargs directly. */
6255 c_function_varargs = 1;
6258 /* Store the parameter declarations into the current function declaration.
6259 This is called after parsing the parameter declarations, before
6260 digesting the body of the function.
6262 For an old-style definition, modify the function's type
6263 to specify at least the number of arguments. */
6268 tree fndecl = current_function_decl;
6271 /* This is either a chain of PARM_DECLs (if a prototype was used)
6272 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6273 tree specparms = current_function_parms;
6275 /* This is a list of types declared among parms in a prototype. */
6276 tree parmtags = current_function_parm_tags;
6278 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6279 tree parmdecls = getdecls ();
6281 /* This is a chain of any other decls that came in among the parm
6282 declarations. If a parm is declared with enum {foo, bar} x;
6283 then CONST_DECLs for foo and bar are put here. */
6286 /* Nonzero if this definition is written with a prototype. */
6289 /* The function containing FNDECL, if any. */
6290 tree context = decl_function_context (fndecl);
6292 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6294 /* This case is when the function was defined with an ANSI prototype.
6295 The parms already have decls, so we need not do anything here
6296 except record them as in effect
6297 and complain if any redundant old-style parm decls were written. */
6308 error_with_decl (fndecl,
6309 "parm types given both in parmlist and separately");
6310 /* Get rid of the erroneous decls; don't keep them on
6311 the list of parms, since they might not be PARM_DECLs. */
6312 for (decl = current_binding_level->names;
6313 decl; decl = TREE_CHAIN (decl))
6314 if (DECL_NAME (decl))
6315 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6316 for (link = current_binding_level->shadowed;
6317 link; link = TREE_CHAIN (link))
6318 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6319 current_binding_level->names = 0;
6320 current_binding_level->shadowed = 0;
6323 specparms = nreverse (specparms);
6324 for (parm = specparms; parm; parm = next)
6326 next = TREE_CHAIN (parm);
6327 if (TREE_CODE (parm) == PARM_DECL)
6329 if (DECL_NAME (parm) == 0)
6330 error_with_decl (parm, "parameter name omitted");
6331 else if (TREE_CODE (TREE_TYPE (parm)) != ERROR_MARK
6332 && VOID_TYPE_P (TREE_TYPE (parm)))
6334 error_with_decl (parm, "parameter `%s' declared void");
6335 /* Change the type to error_mark_node so this parameter
6336 will be ignored by assign_parms. */
6337 TREE_TYPE (parm) = error_mark_node;
6343 /* If we find an enum constant or a type tag,
6344 put it aside for the moment. */
6345 TREE_CHAIN (parm) = 0;
6346 others = chainon (others, parm);
6350 /* Get the decls in their original chain order
6351 and record in the function. */
6352 DECL_ARGUMENTS (fndecl) = getdecls ();
6355 /* If this function takes a variable number of arguments,
6356 add a phony parameter to the end of the parm list,
6357 to represent the position of the first unnamed argument. */
6358 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6361 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6362 /* Let's hope the address of the unnamed parm
6363 won't depend on its type. */
6364 TREE_TYPE (dummy) = integer_type_node;
6365 DECL_ARG_TYPE (dummy) = integer_type_node;
6366 DECL_ARGUMENTS (fndecl) = chainon (DECL_ARGUMENTS (fndecl), dummy);
6370 /* Now pushdecl the enum constants. */
6371 for (parm = others; parm; parm = next)
6373 next = TREE_CHAIN (parm);
6374 if (DECL_NAME (parm) == 0)
6376 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6378 else if (TREE_CODE (parm) != PARM_DECL)
6382 storetags (chainon (parmtags, gettags ()));
6386 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6387 each with a parm name as the TREE_VALUE.
6389 PARMDECLS is a chain of declarations for parameters.
6390 Warning! It can also contain CONST_DECLs which are not parameters
6391 but are names of enumerators of any enum types
6392 declared among the parameters.
6394 First match each formal parameter name with its declaration.
6395 Associate decls with the names and store the decls
6396 into the TREE_PURPOSE slots. */
6398 /* We use DECL_WEAK as a flag to show which parameters have been
6399 seen already since it is not used on PARM_DECL or CONST_DECL. */
6400 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6401 DECL_WEAK (parm) = 0;
6403 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6405 tree tail, found = NULL;
6407 if (TREE_VALUE (parm) == 0)
6409 error_with_decl (fndecl,
6410 "parameter name missing from parameter list");
6411 TREE_PURPOSE (parm) = 0;
6415 /* See if any of the parmdecls specifies this parm by name.
6416 Ignore any enumerator decls. */
6417 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6418 if (DECL_NAME (tail) == TREE_VALUE (parm)
6419 && TREE_CODE (tail) == PARM_DECL)
6425 /* If declaration already marked, we have a duplicate name.
6426 Complain, and don't use this decl twice. */
6427 if (found && DECL_WEAK (found))
6429 error_with_decl (found, "multiple parameters named `%s'");
6433 /* If the declaration says "void", complain and ignore it. */
6434 if (found && VOID_TYPE_P (TREE_TYPE (found)))
6436 error_with_decl (found, "parameter `%s' declared void");
6437 TREE_TYPE (found) = integer_type_node;
6438 DECL_ARG_TYPE (found) = integer_type_node;
6439 layout_decl (found, 0);
6442 /* Traditionally, a parm declared float is actually a double. */
6443 if (found && flag_traditional
6444 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6446 TREE_TYPE (found) = double_type_node;
6447 DECL_ARG_TYPE (found) = double_type_node;
6448 layout_decl (found, 0);
6451 /* If no declaration found, default to int. */
6454 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6456 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6457 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6458 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6460 pedwarn_with_decl (found, "type of `%s' defaults to `int'");
6461 else if (extra_warnings)
6462 warning_with_decl (found, "type of `%s' defaults to `int'");
6466 TREE_PURPOSE (parm) = found;
6468 /* Mark this decl as "already found". */
6469 DECL_WEAK (found) = 1;
6472 /* Put anything which is on the parmdecls chain and which is
6473 not a PARM_DECL onto the list NONPARMS. (The types of
6474 non-parm things which might appear on the list include
6475 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6476 any actual PARM_DECLs not matched with any names. */
6479 for (parm = parmdecls; parm;)
6481 tree next = TREE_CHAIN (parm);
6482 TREE_CHAIN (parm) = 0;
6484 if (TREE_CODE (parm) != PARM_DECL)
6485 nonparms = chainon (nonparms, parm);
6488 /* Complain about args with incomplete types. */
6489 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6491 error_with_decl (parm, "parameter `%s' has incomplete type");
6492 TREE_TYPE (parm) = error_mark_node;
6495 if (! DECL_WEAK (parm))
6497 error_with_decl (parm,
6498 "declaration for parameter `%s' but no such parameter");
6499 /* Pretend the parameter was not missing.
6500 This gets us to a standard state and minimizes
6501 further error messages. */
6503 = chainon (specparms,
6504 tree_cons (parm, NULL_TREE, NULL_TREE));
6511 /* Chain the declarations together in the order of the list of
6512 names. Store that chain in the function decl, replacing the
6515 DECL_ARGUMENTS (fndecl) = 0;
6518 for (last = 0; parm; parm = TREE_CHAIN (parm))
6519 if (TREE_PURPOSE (parm))
6522 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6524 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6525 last = TREE_PURPOSE (parm);
6526 TREE_CHAIN (last) = 0;
6530 /* If there was a previous prototype,
6531 set the DECL_ARG_TYPE of each argument according to
6532 the type previously specified, and report any mismatches. */
6534 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6537 for (parm = DECL_ARGUMENTS (fndecl),
6538 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6539 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6540 != void_type_node));
6541 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6543 if (parm == 0 || type == 0
6544 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6546 error ("number of arguments doesn't match prototype");
6547 error_with_file_and_line (current_function_prototype_file,
6548 current_function_prototype_line,
6549 "prototype declaration");
6552 /* Type for passing arg must be consistent with that
6553 declared for the arg. ISO C says we take the unqualified
6554 type for parameters declared with qualified type. */
6555 if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6556 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
6558 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6559 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6561 /* Adjust argument to match prototype. E.g. a previous
6562 `int foo(float);' prototype causes
6563 `int foo(x) float x; {...}' to be treated like
6564 `int foo(float x) {...}'. This is particularly
6565 useful for argument types like uid_t. */
6566 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6568 if (PROMOTE_PROTOTYPES
6569 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6570 && TYPE_PRECISION (TREE_TYPE (parm))
6571 < TYPE_PRECISION (integer_type_node))
6572 DECL_ARG_TYPE (parm) = integer_type_node;
6576 pedwarn ("promoted argument `%s' doesn't match prototype",
6577 IDENTIFIER_POINTER (DECL_NAME (parm)));
6578 warning_with_file_and_line
6579 (current_function_prototype_file,
6580 current_function_prototype_line,
6581 "prototype declaration");
6584 /* If -traditional, allow `int' argument to match
6585 `unsigned' prototype. */
6586 else if (! (flag_traditional
6587 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6588 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6590 error ("argument `%s' doesn't match prototype",
6591 IDENTIFIER_POINTER (DECL_NAME (parm)));
6592 error_with_file_and_line (current_function_prototype_file,
6593 current_function_prototype_line,
6594 "prototype declaration");
6598 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6601 /* Otherwise, create a prototype that would match. */
6605 tree actual = 0, last = 0, type;
6607 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6609 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6611 TREE_CHAIN (last) = type;
6616 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6618 TREE_CHAIN (last) = type;
6622 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6623 of the type of this function, but we need to avoid having this
6624 affect the types of other similarly-typed functions, so we must
6625 first force the generation of an identical (but separate) type
6626 node for the relevant function type. The new node we create
6627 will be a variant of the main variant of the original function
6630 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6632 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6635 /* Now store the final chain of decls for the arguments
6636 as the decl-chain of the current lexical scope.
6637 Put the enumerators in as well, at the front so that
6638 DECL_ARGUMENTS is not modified. */
6640 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6643 /* Make sure the binding level for the top of the function body
6644 gets a BLOCK if there are any in the function.
6645 Otherwise, the dbx output is wrong. */
6647 keep_next_if_subblocks = 1;
6649 /* ??? This might be an improvement,
6650 but needs to be thought about some more. */
6652 keep_next_level_flag = 1;
6655 /* Write a record describing this function definition to the prototypes
6656 file (if requested). */
6658 gen_aux_info_record (fndecl, 1, 0, prototype);
6660 /* Initialize the RTL code for the function. */
6661 init_function_start (fndecl, input_filename, lineno);
6663 /* Begin the statement tree for this function. */
6664 begin_stmt_tree (&DECL_SAVED_TREE (current_function_decl));
6666 /* If this is a nested function, save away the sizes of any
6667 variable-size types so that we can expand them when generating
6673 DECL_LANG_SPECIFIC (fndecl)->pending_sizes
6674 = nreverse (get_pending_sizes ());
6675 for (t = DECL_LANG_SPECIFIC (fndecl)->pending_sizes;
6678 SAVE_EXPR_CONTEXT (TREE_VALUE (t)) = context;
6681 /* This function is being processed in whole-function mode. */
6682 cfun->x_whole_function_mode_p = 1;
6684 /* Even though we're inside a function body, we still don't want to
6685 call expand_expr to calculate the size of a variable-sized array.
6686 We haven't necessarily assigned RTL to all variables yet, so it's
6687 not safe to try to expand expressions involving them. */
6688 immediate_size_expand = 0;
6689 cfun->x_dont_save_pending_sizes_p = 1;
6692 /* Finish up a function declaration and compile that function
6693 all the way to assembler language output. The free the storage
6694 for the function definition.
6696 This is called after parsing the body of the function definition.
6698 NESTED is nonzero if the function being finished is nested in another. */
6701 finish_function (nested)
6704 tree fndecl = current_function_decl;
6706 /* TREE_READONLY (fndecl) = 1;
6707 This caused &foo to be of type ptr-to-const-function
6708 which then got a warning when stored in a ptr-to-function variable. */
6711 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6713 /* Must mark the RESULT_DECL as being in this function. */
6715 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6717 /* Obey `register' declarations if `setjmp' is called in this fn. */
6718 if (flag_traditional && current_function_calls_setjmp)
6720 setjmp_protect (DECL_INITIAL (fndecl));
6721 setjmp_protect_args ();
6724 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6726 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6727 != integer_type_node)
6729 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6730 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6732 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
6736 #ifdef DEFAULT_MAIN_RETURN
6737 /* Make it so that `main' always returns success by default. */
6738 DEFAULT_MAIN_RETURN;
6741 c_expand_return (integer_zero_node);
6746 finish_fname_decls ();
6748 /* Tie off the statement tree for this function. */
6749 finish_stmt_tree (&DECL_SAVED_TREE (fndecl));
6750 /* Clear out memory we no longer need. */
6751 free_after_parsing (cfun);
6752 /* Since we never call rest_of_compilation, we never clear
6753 CFUN. Do so explicitly. */
6754 free_after_compilation (cfun);
6759 /* Generate RTL for the body of this function. */
6760 c_expand_body (fndecl, nested, 1);
6761 /* Let the error reporting routines know that we're outside a
6762 function. For a nested function, this value is used in
6763 pop_c_function_context and then reset via pop_function_context. */
6764 current_function_decl = NULL;
6768 /* Generate the RTL for a deferred function FNDECL. */
6771 c_expand_deferred_function (fndecl)
6774 /* DECL_INLINE or DECL_RESULT might got cleared after the inline
6775 function was deferred, e.g. in duplicate_decls. */
6776 if (DECL_INLINE (fndecl) && DECL_RESULT (fndecl))
6778 c_expand_body (fndecl, 0, 0);
6779 current_function_decl = NULL;
6783 /* Generate the RTL for the body of FNDECL. If NESTED_P is non-zero,
6784 then we are already in the process of generating RTL for another
6785 function. If can_defer_p is zero, we won't attempt to defer the
6786 generation of RTL. */
6789 c_expand_body (fndecl, nested_p, can_defer_p)
6791 int nested_p, can_defer_p;
6793 int uninlinable = 1;
6795 /* There's no reason to do any of the work here if we're only doing
6796 semantic analysis; this code just generates RTL. */
6797 if (flag_syntax_only)
6800 if (flag_inline_trees)
6802 /* First, cache whether the current function is inlinable. Some
6803 predicates depend on cfun and current_function_decl to
6804 function completely. */
6805 timevar_push (TV_INTEGRATION);
6806 uninlinable = ! tree_inlinable_function_p (fndecl);
6808 if (! uninlinable && can_defer_p
6809 /* Save function tree for inlining. Should return 0 if the
6810 language does not support function deferring or the
6811 function could not be deferred. */
6812 && defer_fn (fndecl))
6814 /* Let the back-end know that this function exists. */
6815 (*debug_hooks->deferred_inline_function) (fndecl);
6816 timevar_pop (TV_INTEGRATION);
6820 /* Then, inline any functions called in it. */
6821 optimize_inline_calls (fndecl);
6822 timevar_pop (TV_INTEGRATION);
6825 timevar_push (TV_EXPAND);
6829 /* Make sure that we will evaluate variable-sized types involved
6830 in our function's type. */
6831 expand_pending_sizes (DECL_LANG_SPECIFIC (fndecl)->pending_sizes);
6832 /* Squirrel away our current state. */
6833 push_function_context ();
6836 /* Initialize the RTL code for the function. */
6837 current_function_decl = fndecl;
6838 init_function_start (fndecl, input_filename, DECL_SOURCE_LINE (fndecl));
6840 /* This function is being processed in whole-function mode. */
6841 cfun->x_whole_function_mode_p = 1;
6843 /* Even though we're inside a function body, we still don't want to
6844 call expand_expr to calculate the size of a variable-sized array.
6845 We haven't necessarily assigned RTL to all variables yet, so it's
6846 not safe to try to expand expressions involving them. */
6847 immediate_size_expand = 0;
6848 cfun->x_dont_save_pending_sizes_p = 1;
6850 /* If this is a varargs function, inform function.c. */
6851 if (c_function_varargs)
6854 /* Set up parameters and prepare for return, for the function. */
6855 expand_function_start (fndecl, 0);
6857 /* If this function is `main', emit a call to `__main'
6858 to run global initializers, etc. */
6859 if (DECL_NAME (fndecl)
6860 && MAIN_NAME_P (DECL_NAME (fndecl))
6861 && DECL_CONTEXT (fndecl) == NULL_TREE)
6862 expand_main_function ();
6864 /* Generate the RTL for this function. */
6865 expand_stmt (DECL_SAVED_TREE (fndecl));
6868 /* Allow the body of the function to be garbage collected. */
6869 DECL_SAVED_TREE (fndecl) = NULL_TREE;
6872 /* We hard-wired immediate_size_expand to zero above.
6873 expand_function_end will decrement this variable. So, we set the
6874 variable to one here, so that after the decrement it will remain
6876 immediate_size_expand = 1;
6878 /* Allow language dialects to perform special processing. */
6879 if (lang_expand_function_end)
6880 (*lang_expand_function_end) ();
6882 /* Generate rtl for function exit. */
6883 expand_function_end (input_filename, lineno, 0);
6885 /* If this is a nested function, protect the local variables in the stack
6886 above us from being collected while we're compiling this function. */
6888 ggc_push_context ();
6890 /* Run the optimizers and output the assembler code for this function. */
6891 rest_of_compilation (fndecl);
6893 /* Undo the GC context switch. */
6897 /* With just -W, complain only if function returns both with
6898 and without a value. */
6900 && current_function_returns_value
6901 && current_function_returns_null)
6902 warning ("this function may return with or without a value");
6904 /* If requested, warn about function definitions where the function will
6905 return a value (usually of some struct or union type) which itself will
6906 take up a lot of stack space. */
6908 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6910 tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6912 if (ret_type && TYPE_SIZE_UNIT (ret_type)
6913 && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST
6914 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type),
6917 unsigned int size_as_int
6918 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type));
6920 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0)
6921 warning_with_decl (fndecl,
6922 "size of return value of `%s' is %u bytes",
6925 warning_with_decl (fndecl,
6926 "size of return value of `%s' is larger than %d bytes",
6931 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested_p
6932 && ! flag_inline_trees)
6934 /* Stop pointing to the local nodes about to be freed.
6935 But DECL_INITIAL must remain nonzero so we know this
6936 was an actual function definition.
6937 For a nested function, this is done in pop_c_function_context.
6938 If rest_of_compilation set this to 0, leave it 0. */
6939 if (DECL_INITIAL (fndecl) != 0)
6940 DECL_INITIAL (fndecl) = error_mark_node;
6942 DECL_ARGUMENTS (fndecl) = 0;
6945 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6947 if (targetm.have_ctors_dtors)
6948 (* targetm.asm_out.constructor) (XEXP (DECL_RTL (fndecl), 0),
6949 DEFAULT_INIT_PRIORITY);
6951 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6954 if (DECL_STATIC_DESTRUCTOR (fndecl))
6956 if (targetm.have_ctors_dtors)
6957 (* targetm.asm_out.destructor) (XEXP (DECL_RTL (fndecl), 0),
6958 DEFAULT_INIT_PRIORITY);
6960 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6964 /* Return to the enclosing function. */
6965 pop_function_context ();
6966 timevar_pop (TV_EXPAND);
6969 /* Check the declarations given in a for-loop for satisfying the C99
6972 check_for_loop_decls ()
6978 /* If we get here, declarations have been used in a for loop without
6979 the C99 for loop scope. This doesn't make much sense, so don't
6981 error ("`for' loop initial declaration used outside C99 mode");
6984 /* C99 subclause 6.8.5 paragraph 3:
6986 [#3] The declaration part of a for statement shall only
6987 declare identifiers for objects having storage class auto or
6990 It isn't clear whether, in this sentence, "identifiers" binds to
6991 "shall only declare" or to "objects" - that is, whether all identifiers
6992 declared must be identifiers for objects, or whether the restriction
6993 only applies to those that are. (A question on this in comp.std.c
6994 in November 2000 received no answer.) We implement the strictest
6995 interpretation, to avoid creating an extension which later causes
6998 for (t = gettags (); t; t = TREE_CHAIN (t))
7000 if (TREE_PURPOSE (t) != 0)
7002 enum tree_code code = TREE_CODE (TREE_VALUE (t));
7004 if (code == RECORD_TYPE)
7005 error ("`struct %s' declared in `for' loop initial declaration",
7006 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
7007 else if (code == UNION_TYPE)
7008 error ("`union %s' declared in `for' loop initial declaration",
7009 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
7011 error ("`enum %s' declared in `for' loop initial declaration",
7012 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
7016 for (t = getdecls (); t; t = TREE_CHAIN (t))
7018 if (TREE_CODE (t) != VAR_DECL && DECL_NAME (t))
7019 error_with_decl (t, "declaration of non-variable `%s' in `for' loop initial declaration");
7020 else if (TREE_STATIC (t))
7021 error_with_decl (t, "declaration of static variable `%s' in `for' loop initial declaration");
7022 else if (DECL_EXTERNAL (t))
7023 error_with_decl (t, "declaration of `extern' variable `%s' in `for' loop initial declaration");
7027 /* Save and restore the variables in this file and elsewhere
7028 that keep track of the progress of compilation of the current function.
7029 Used for nested functions. */
7031 struct c_language_function
7033 struct language_function base;
7035 tree shadowed_labels;
7038 int warn_about_return_type;
7040 struct binding_level *binding_level;
7043 /* Save and reinitialize the variables
7044 used during compilation of a C function. */
7047 push_c_function_context (f)
7050 struct c_language_function *p;
7051 p = ((struct c_language_function *)
7052 xmalloc (sizeof (struct c_language_function)));
7053 f->language = (struct language_function *) p;
7055 p->base.x_stmt_tree = c_stmt_tree;
7056 p->base.x_scope_stmt_stack = c_scope_stmt_stack;
7057 p->named_labels = named_labels;
7058 p->shadowed_labels = shadowed_labels;
7059 p->returns_value = current_function_returns_value;
7060 p->returns_null = current_function_returns_null;
7061 p->warn_about_return_type = warn_about_return_type;
7062 p->extern_inline = current_extern_inline;
7063 p->binding_level = current_binding_level;
7066 /* Restore the variables used during compilation of a C function. */
7069 pop_c_function_context (f)
7072 struct c_language_function *p
7073 = (struct c_language_function *) f->language;
7076 /* Bring back all the labels that were shadowed. */
7077 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
7078 if (DECL_NAME (TREE_VALUE (link)) != 0)
7079 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
7080 = TREE_VALUE (link);
7082 if (DECL_SAVED_INSNS (current_function_decl) == 0
7083 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
7085 /* Stop pointing to the local nodes about to be freed. */
7086 /* But DECL_INITIAL must remain nonzero so we know this
7087 was an actual function definition. */
7088 DECL_INITIAL (current_function_decl) = error_mark_node;
7089 DECL_ARGUMENTS (current_function_decl) = 0;
7092 c_stmt_tree = p->base.x_stmt_tree;
7093 c_scope_stmt_stack = p->base.x_scope_stmt_stack;
7094 named_labels = p->named_labels;
7095 shadowed_labels = p->shadowed_labels;
7096 current_function_returns_value = p->returns_value;
7097 current_function_returns_null = p->returns_null;
7098 warn_about_return_type = p->warn_about_return_type;
7099 current_extern_inline = p->extern_inline;
7100 current_binding_level = p->binding_level;
7106 /* Mark the language specific parts of F for GC. */
7109 mark_c_function_context (f)
7112 struct c_language_function *p
7113 = (struct c_language_function *) f->language;
7118 mark_c_language_function (&p->base);
7119 ggc_mark_tree (p->shadowed_labels);
7120 ggc_mark_tree (p->named_labels);
7121 mark_binding_level (&p->binding_level);
7124 /* Copy the DECL_LANG_SPECIFIC data associated with NODE. */
7127 copy_lang_decl (decl)
7130 struct lang_decl *ld;
7132 if (!DECL_LANG_SPECIFIC (decl))
7135 ld = (struct lang_decl *) ggc_alloc (sizeof (struct lang_decl));
7136 memcpy ((char *) ld, (char *) DECL_LANG_SPECIFIC (decl),
7137 sizeof (struct lang_decl));
7138 DECL_LANG_SPECIFIC (decl) = ld;
7141 /* Mark the language specific bits in T for GC. */
7147 if (TREE_CODE (t) == IDENTIFIER_NODE)
7149 struct lang_identifier *i = (struct lang_identifier *) t;
7150 ggc_mark_tree (i->global_value);
7151 ggc_mark_tree (i->local_value);
7152 ggc_mark_tree (i->label_value);
7153 ggc_mark_tree (i->implicit_decl);
7154 ggc_mark_tree (i->error_locus);
7155 ggc_mark_tree (i->limbo_value);
7157 else if (TYPE_P (t) && TYPE_LANG_SPECIFIC (t))
7158 ggc_mark (TYPE_LANG_SPECIFIC (t));
7159 else if (DECL_P (t) && DECL_LANG_SPECIFIC (t))
7161 ggc_mark (DECL_LANG_SPECIFIC (t));
7162 c_mark_lang_decl (&DECL_LANG_SPECIFIC (t)->base);
7163 ggc_mark_tree (DECL_LANG_SPECIFIC (t)->pending_sizes);
7167 /* The functions below are required for functionality of doing
7168 function at once processing in the C front end. Currently these
7169 functions are not called from anywhere in the C front end, but as
7170 these changes continue, that will change. */
7172 /* Returns non-zero if the current statement is a full expression,
7173 i.e. temporaries created during that statement should be destroyed
7174 at the end of the statement. */
7177 stmts_are_full_exprs_p ()
7182 /* Returns the stmt_tree (if any) to which statements are currently
7183 being added. If there is no active statement-tree, NULL is
7187 current_stmt_tree ()
7189 return &c_stmt_tree;
7192 /* Returns the stack of SCOPE_STMTs for the current function. */
7195 current_scope_stmt_stack ()
7197 return &c_scope_stmt_stack;
7200 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
7204 anon_aggr_type_p (node)
7205 tree node ATTRIBUTE_UNUSED;
7210 /* Dummy function in place of callback used by C++. */
7213 extract_interface_info ()
7217 /* Return a new COMPOUND_STMT, after adding it to the current
7221 c_begin_compound_stmt ()
7225 /* Create the COMPOUND_STMT. */
7226 stmt = add_stmt (build_stmt (COMPOUND_STMT, NULL_TREE));
7231 /* Expand T (a DECL_STMT) if it declares an entity not handled by the
7235 c_expand_decl_stmt (t)
7238 tree decl = DECL_STMT_DECL (t);
7240 /* Expand nested functions. */
7241 if (TREE_CODE (decl) == FUNCTION_DECL
7242 && DECL_CONTEXT (decl) == current_function_decl
7243 && DECL_SAVED_TREE (decl))
7244 c_expand_body (decl, /*nested_p=*/1, /*can_defer_p=*/0);
7247 /* Return the IDENTIFIER_GLOBAL_VALUE of T, for use in common code, since
7248 the definition of IDENTIFIER_GLOBAL_VALUE is different for C and C++. */
7251 identifier_global_value (t)
7254 return IDENTIFIER_GLOBAL_VALUE (t);
7257 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
7258 otherwise the name is found in ridpointers from RID_INDEX. */
7261 record_builtin_type (rid_index, name, type)
7268 id = ridpointers[(int) rid_index];
7270 id = get_identifier (name);
7271 pushdecl (build_decl (TYPE_DECL, id, type));
7274 /* Build the void_list_node (void_type_node having been created). */
7276 build_void_list_node ()
7278 tree t = build_tree_list (NULL_TREE, void_type_node);