1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000
3 Free Software Foundation, Inc.
5 This file is part of GNU CC.
7 GNU CC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU CC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
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. */
47 extern cpp_reader parse_in;
50 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
52 { NORMAL, /* Ordinary declaration */
53 FUNCDEF, /* Function definition */
54 PARM, /* Declaration of parm before function body */
55 FIELD, /* Declaration inside struct or union */
56 BITFIELD, /* Likewise but with specified width */
57 TYPENAME}; /* Typename (inside cast or sizeof) */
59 /* We let tm.h override the types used here, to handle trivial differences
60 such as the choice of unsigned int or long unsigned int for size_t.
61 When machines start needing nontrivial differences in the size type,
62 it would be best to do something here to figure out automatically
63 from other information what type to use. */
66 #define SIZE_TYPE "long unsigned int"
70 #define PTRDIFF_TYPE "long int"
74 #define WCHAR_TYPE "int"
78 #define WINT_TYPE "unsigned int"
82 #define INTMAX_TYPE ((INT_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \
84 : ((LONG_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \
90 #define UINTMAX_TYPE ((INT_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \
92 : ((LONG_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \
93 ? "long unsigned int" \
94 : "long long unsigned int"))
97 /* Nonzero if we have seen an invalid cross reference
98 to a struct, union, or enum, but not yet printed the message. */
100 tree pending_invalid_xref;
101 /* File and line to appear in the eventual error message. */
102 const char *pending_invalid_xref_file;
103 int pending_invalid_xref_line;
105 /* While defining an enum type, this is 1 plus the last enumerator
106 constant value. Note that will do not have to save this or `enum_overflow'
107 around nested function definition since such a definition could only
108 occur in an enum value expression and we don't use these variables in
111 static tree enum_next_value;
113 /* Nonzero means that there was overflow computing enum_next_value. */
115 static int enum_overflow;
117 /* Parsing a function declarator leaves a list of parameter names
118 or a chain or parameter decls here. */
120 static tree last_function_parms;
122 /* Parsing a function declarator leaves here a chain of structure
123 and enum types declared in the parmlist. */
125 static tree last_function_parm_tags;
127 /* After parsing the declarator that starts a function definition,
128 `start_function' puts here the list of parameter names or chain of decls.
129 `store_parm_decls' finds it here. */
131 static tree current_function_parms;
133 /* Similar, for last_function_parm_tags. */
134 static tree current_function_parm_tags;
136 /* Similar, for the file and line that the prototype came from if this is
137 an old-style definition. */
138 static const char *current_function_prototype_file;
139 static int current_function_prototype_line;
141 /* The current statement tree. */
143 static struct stmt_tree_s c_stmt_tree;
145 /* The current scope statement stack. */
147 static tree c_scope_stmt_stack;
149 /* Nonzero if __FUNCTION__ and its ilk have been declared in this
152 static int c_function_name_declared_p;
154 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
155 that have names. Here so we can clear out their names' definitions
156 at the end of the function. */
158 static tree named_labels;
160 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
162 static tree shadowed_labels;
164 /* Nonzero when store_parm_decls is called indicates a varargs function.
165 Value not meaningful after store_parm_decls. */
167 static int c_function_varargs;
169 /* Set to 0 at beginning of a function definition, set to 1 if
170 a return statement that specifies a return value is seen. */
172 int current_function_returns_value;
174 /* Set to 0 at beginning of a function definition, set to 1 if
175 a return statement with no argument is seen. */
177 int current_function_returns_null;
179 /* Set to nonzero by `grokdeclarator' for a function
180 whose return type is defaulted, if warnings for this are desired. */
182 static int warn_about_return_type;
184 /* Nonzero when starting a function declared `extern inline'. */
186 static int current_extern_inline;
188 /* For each binding contour we allocate a binding_level structure
189 * which records the names defined in that contour.
192 * 1) one for each function definition,
193 * where internal declarations of the parameters appear.
194 * 2) one for each compound statement,
195 * to record its declarations.
197 * The current meaning of a name can be found by searching the levels from
198 * the current one out to the global one.
201 /* Note that the information in the `names' component of the global contour
202 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
206 /* A chain of _DECL nodes for all variables, constants, functions,
207 and typedef types. These are in the reverse of the order supplied.
211 /* A list of structure, union and enum definitions,
212 * for looking up tag names.
213 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
214 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
215 * or ENUMERAL_TYPE node.
219 /* For each level, a list of shadowed outer-level local definitions
220 to be restored when this level is popped.
221 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
222 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
225 /* For each level (except not the global one),
226 a chain of BLOCK nodes for all the levels
227 that were entered and exited one level down. */
230 /* The BLOCK node for this level, if one has been preallocated.
231 If 0, the BLOCK is allocated (if needed) when the level is popped. */
234 /* The binding level which this one is contained in (inherits from). */
235 struct binding_level *level_chain;
237 /* Nonzero for the level that holds the parameters of a function. */
240 /* Nonzero if this level "doesn't exist" for tags. */
241 char tag_transparent;
243 /* Nonzero if sublevels of this level "don't exist" for tags.
244 This is set in the parm level of a function definition
245 while reading the function body, so that the outermost block
246 of the function body will be tag-transparent. */
247 char subblocks_tag_transparent;
249 /* Nonzero means make a BLOCK for this level regardless of all else. */
252 /* Nonzero means make a BLOCK if this level has any subblocks. */
253 char keep_if_subblocks;
255 /* Number of decls in `names' that have incomplete
256 structure or union types. */
259 /* A list of decls giving the (reversed) specified order of parms,
260 not including any forward-decls in the parmlist.
261 This is so we can put the parms in proper order for assign_parms. */
265 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
267 /* The binding level currently in effect. */
269 static struct binding_level *current_binding_level;
271 /* A chain of binding_level structures awaiting reuse. */
273 static struct binding_level *free_binding_level;
275 /* The outermost binding level, for names of file scope.
276 This is created when the compiler is started and exists
277 through the entire run. */
279 static struct binding_level *global_binding_level;
281 /* Binding level structures are initialized by copying this one. */
283 static struct binding_level clear_binding_level
284 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, 0,
287 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
289 static int keep_next_level_flag;
291 /* Nonzero means make a BLOCK for the next level pushed
292 if it has subblocks. */
294 static int keep_next_if_subblocks;
296 /* The chain of outer levels of label scopes.
297 This uses the same data structure used for binding levels,
298 but it works differently: each link in the chain records
299 saved values of named_labels and shadowed_labels for
300 a label binding level outside the current one. */
302 static struct binding_level *label_level_chain;
304 /* Functions called automatically at the beginning and end of execution. */
306 tree static_ctors, static_dtors;
308 /* Forward declarations. */
310 static struct binding_level * make_binding_level PARAMS ((void));
311 static void mark_binding_level PARAMS ((void *));
312 static void clear_limbo_values PARAMS ((tree));
313 static int duplicate_decls PARAMS ((tree, tree, int));
314 static int redeclaration_error_message PARAMS ((tree, tree));
315 static void storedecls PARAMS ((tree));
316 static void storetags PARAMS ((tree));
317 static tree lookup_tag PARAMS ((enum tree_code, tree,
318 struct binding_level *, int));
319 static tree lookup_tag_reverse PARAMS ((tree));
320 static tree grokdeclarator PARAMS ((tree, tree, enum decl_context,
322 static tree grokparms PARAMS ((tree, int));
323 static void layout_array_type PARAMS ((tree));
324 static tree c_make_fname_decl PARAMS ((tree, const char *, int));
325 static void c_expand_body PARAMS ((tree, int));
327 /* C-specific option variables. */
329 /* Nonzero means allow type mismatches in conditional expressions;
330 just make their values `void'. */
332 int flag_cond_mismatch;
334 /* Nonzero means give `double' the same size as `float'. */
336 int flag_short_double;
338 /* Nonzero means give `wchar_t' the same size as `short'. */
340 int flag_short_wchar;
342 /* Nonzero means don't recognize the keyword `asm'. */
346 /* Nonzero means do some things the same way PCC does. */
348 int flag_traditional;
350 /* Nonzero means enable C89 Amendment 1 features, other than digraphs. */
354 /* Nonzero means use the ISO C99 dialect of C. */
358 /* Nonzero means accept digraphs. */
360 int flag_digraphs = 1;
362 /* Nonzero means that we have builtin functions, and main is an int */
366 /* Nonzero means add default format_arg attributes for functions not
369 int flag_noniso_default_format_attributes = 1;
371 /* Nonzero means to allow single precision math even if we're generally
372 being traditional. */
373 int flag_allow_single_precision = 0;
375 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
377 int flag_signed_bitfields = 1;
378 int explicit_flag_signed_bitfields = 0;
380 /* Nonzero means warn about use of implicit int. */
382 int warn_implicit_int;
384 /* Nonzero means warn about usage of long long when `-pedantic'. */
386 int warn_long_long = 1;
388 /* Nonzero means message about use of implicit function declarations;
389 1 means warning; 2 means error. */
391 int mesg_implicit_function_declaration = -1;
393 /* Nonzero means give string constants the type `const char *'
394 to get extra warnings from them. These warnings will be too numerous
395 to be useful, except in thoroughly ANSIfied programs. */
397 int flag_const_strings;
399 /* Nonzero means warn about pointer casts that can drop a type qualifier
400 from the pointer target type. */
404 /* Nonzero means warn when casting a function call to a type that does
405 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
406 when there is no previous declaration of sqrt or malloc. */
408 int warn_bad_function_cast;
410 /* Warn about functions which might be candidates for format attributes. */
412 int warn_missing_format_attribute;
414 /* Warn about traditional constructs whose meanings changed in ANSI C. */
416 int warn_traditional;
418 /* Nonzero means warn about sizeof(function) or addition/subtraction
419 of function pointers. */
421 int warn_pointer_arith;
423 /* Nonzero means warn for non-prototype function decls
424 or non-prototyped defs without previous prototype. */
426 int warn_strict_prototypes;
428 /* Nonzero means warn for any global function def
429 without separate previous prototype decl. */
431 int warn_missing_prototypes;
433 /* Nonzero means warn for any global function def
434 without separate previous decl. */
436 int warn_missing_declarations;
438 /* Nonzero means warn about multiple (redundant) decls for the same single
439 variable or function. */
441 int warn_redundant_decls = 0;
443 /* Nonzero means warn about extern declarations of objects not at
444 file-scope level and about *all* declarations of functions (whether
445 extern or static) not at file-scope level. Note that we exclude
446 implicit function declarations. To get warnings about those, use
449 int warn_nested_externs = 0;
451 /* Warn about *printf or *scanf format/argument anomalies. */
455 /* Warn about a subscript that has type char. */
457 int warn_char_subscripts = 0;
459 /* Warn if a type conversion is done that might have confusing results. */
463 /* Warn if adding () is suggested. */
465 int warn_parentheses;
467 /* Warn if initializer is not completely bracketed. */
469 int warn_missing_braces;
471 /* Warn if main is suspicious. */
475 /* Warn about #pragma directives that are not recognised. */
477 int warn_unknown_pragmas = 0; /* Tri state variable. */
479 /* Warn about comparison of signed and unsigned values.
480 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
482 int warn_sign_compare = -1;
484 /* Warn about testing equality of floating point numbers. */
486 int warn_float_equal = 0;
488 /* Nonzero means warn about use of multicharacter literals. */
490 int warn_multichar = 1;
492 /* The variant of the C language being processed. */
494 c_language_kind c_language = clk_c;
496 /* Nonzero means `$' can be in an identifier. */
498 #ifndef DOLLARS_IN_IDENTIFIERS
499 #define DOLLARS_IN_IDENTIFIERS 1
501 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
503 /* Decode the string P as a language-specific option for C.
504 Return the number of strings consumed. Should not complain
505 if it does not recognise the option. */
508 c_decode_option (argc, argv)
509 int argc ATTRIBUTE_UNUSED;
512 int strings_processed;
513 const char *option_value = NULL;
516 strings_processed = cpp_handle_option (&parse_in, argc, argv);
518 strings_processed = 0;
519 #endif /* ! USE_CPPLIB */
521 if (!strcmp (p, "-lang-objc"))
522 c_language = clk_objective_c;
523 else if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
525 flag_traditional = 1;
526 flag_writable_strings = 1;
529 else if (!strcmp (p, "-fallow-single-precision"))
530 flag_allow_single_precision = 1;
531 else if (!strcmp (p, "-fhosted") || !strcmp (p, "-fno-freestanding"))
536 else if (!strcmp (p, "-ffreestanding") || !strcmp (p, "-fno-hosted"))
540 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
544 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
546 flag_traditional = 0;
547 flag_writable_strings = 0;
550 else if (!strncmp (p, "-std=", 5))
552 /* Select the appropriate language standard. We currently
554 -std=iso9899:1990 same as -ansi
555 -std=iso9899:199409 ISO C as modified in amend. 1
556 -std=iso9899:1999 ISO C 99
557 -std=c89 same as -std=iso9899:1990
558 -std=c99 same as -std=iso9899:1999
559 -std=gnu89 default, iso9899:1990 + gnu extensions
560 -std=gnu99 iso9899:1999 + gnu extensions
562 const char *argstart = &p[5];
564 if (!strcmp (argstart, "iso9899:1990")
565 || !strcmp (argstart, "c89"))
571 flag_traditional = 0;
572 flag_writable_strings = 0;
574 flag_no_nonansi_builtin = 1;
575 flag_noniso_default_format_attributes = 0;
578 else if (!strcmp (argstart, "iso9899:199409"))
582 goto iso_1990_digraphs;
584 else if (!strcmp (argstart, "iso9899:199x")
585 || !strcmp (argstart, "iso9899:1999")
586 || !strcmp (argstart, "c9x")
587 || !strcmp (argstart, "c99"))
589 flag_traditional = 0;
590 flag_writable_strings = 0;
592 flag_no_nonansi_builtin = 1;
593 flag_noniso_default_format_attributes = 0;
598 else if (!strcmp (argstart, "gnu89"))
600 flag_traditional = 0;
601 flag_writable_strings = 0;
603 flag_no_nonansi_builtin = 0;
604 flag_noniso_default_format_attributes = 1;
609 else if (!strcmp (argstart, "gnu9x") || !strcmp (argstart, "gnu99"))
611 flag_traditional = 0;
612 flag_writable_strings = 0;
614 flag_no_nonansi_builtin = 0;
615 flag_noniso_default_format_attributes = 1;
621 error ("unknown C standard `%s'", argstart);
623 else if (!strcmp (p, "-fdollars-in-identifiers"))
624 dollars_in_ident = 1;
625 else if (!strcmp (p, "-fno-dollars-in-identifiers"))
626 dollars_in_ident = 0;
627 else if (!strcmp (p, "-fsigned-char"))
628 flag_signed_char = 1;
629 else if (!strcmp (p, "-funsigned-char"))
630 flag_signed_char = 0;
631 else if (!strcmp (p, "-fno-signed-char"))
632 flag_signed_char = 0;
633 else if (!strcmp (p, "-fno-unsigned-char"))
634 flag_signed_char = 1;
635 else if (!strcmp (p, "-fsigned-bitfields")
636 || !strcmp (p, "-fno-unsigned-bitfields"))
638 flag_signed_bitfields = 1;
639 explicit_flag_signed_bitfields = 1;
641 else if (!strcmp (p, "-funsigned-bitfields")
642 || !strcmp (p, "-fno-signed-bitfields"))
644 flag_signed_bitfields = 0;
645 explicit_flag_signed_bitfields = 1;
647 else if (!strcmp (p, "-fshort-enums"))
648 flag_short_enums = 1;
649 else if (!strcmp (p, "-fno-short-enums"))
650 flag_short_enums = 0;
651 else if (!strcmp (p, "-fshort-wchar"))
652 flag_short_wchar = 1;
653 else if (!strcmp (p, "-fno-short-wchar"))
654 flag_short_wchar = 0;
655 else if (!strcmp (p, "-fcond-mismatch"))
656 flag_cond_mismatch = 1;
657 else if (!strcmp (p, "-fno-cond-mismatch"))
658 flag_cond_mismatch = 0;
659 else if (!strcmp (p, "-fshort-double"))
660 flag_short_double = 1;
661 else if (!strcmp (p, "-fno-short-double"))
662 flag_short_double = 0;
663 else if (!strcmp (p, "-fasm"))
665 else if (!strcmp (p, "-fno-asm"))
667 else if (!strcmp (p, "-fbuiltin"))
669 else if (!strcmp (p, "-fno-builtin"))
671 else if ((option_value
672 = skip_leading_substring (p, "-fdump-translation-unit-")))
675 error ("no file specified with -fdump-translation-unit");
677 flag_dump_translation_unit = option_value;
679 else if (!strcmp (p, "-ansi"))
681 else if (!strcmp (p, "-Werror-implicit-function-declaration"))
682 mesg_implicit_function_declaration = 2;
683 else if (!strcmp (p, "-Wimplicit-function-declaration"))
684 mesg_implicit_function_declaration = 1;
685 else if (!strcmp (p, "-Wno-implicit-function-declaration"))
686 mesg_implicit_function_declaration = 0;
687 else if (!strcmp (p, "-Wimplicit-int"))
688 warn_implicit_int = 1;
689 else if (!strcmp (p, "-Wno-implicit-int"))
690 warn_implicit_int = 0;
691 else if (!strcmp (p, "-Wimplicit"))
693 warn_implicit_int = 1;
694 if (mesg_implicit_function_declaration != 2)
695 mesg_implicit_function_declaration = 1;
697 else if (!strcmp (p, "-Wno-implicit"))
698 warn_implicit_int = 0, mesg_implicit_function_declaration = 0;
699 else if (!strcmp (p, "-Wlong-long"))
701 else if (!strcmp (p, "-Wno-long-long"))
703 else if (!strcmp (p, "-Wwrite-strings"))
704 flag_const_strings = 1;
705 else if (!strcmp (p, "-Wno-write-strings"))
706 flag_const_strings = 0;
707 else if (!strcmp (p, "-Wcast-qual"))
709 else if (!strcmp (p, "-Wno-cast-qual"))
711 else if (!strcmp (p, "-Wbad-function-cast"))
712 warn_bad_function_cast = 1;
713 else if (!strcmp (p, "-Wno-bad-function-cast"))
714 warn_bad_function_cast = 0;
715 else if (!strcmp (p, "-Wmissing-noreturn"))
716 warn_missing_noreturn = 1;
717 else if (!strcmp (p, "-Wno-missing-noreturn"))
718 warn_missing_noreturn = 0;
719 else if (!strcmp (p, "-Wmissing-format-attribute"))
720 warn_missing_format_attribute = 1;
721 else if (!strcmp (p, "-Wno-missing-format-attribute"))
722 warn_missing_format_attribute = 0;
723 else if (!strcmp (p, "-Wpointer-arith"))
724 warn_pointer_arith = 1;
725 else if (!strcmp (p, "-Wno-pointer-arith"))
726 warn_pointer_arith = 0;
727 else if (!strcmp (p, "-Wstrict-prototypes"))
728 warn_strict_prototypes = 1;
729 else if (!strcmp (p, "-Wno-strict-prototypes"))
730 warn_strict_prototypes = 0;
731 else if (!strcmp (p, "-Wmissing-prototypes"))
732 warn_missing_prototypes = 1;
733 else if (!strcmp (p, "-Wno-missing-prototypes"))
734 warn_missing_prototypes = 0;
735 else if (!strcmp (p, "-Wmissing-declarations"))
736 warn_missing_declarations = 1;
737 else if (!strcmp (p, "-Wno-missing-declarations"))
738 warn_missing_declarations = 0;
739 else if (!strcmp (p, "-Wredundant-decls"))
740 warn_redundant_decls = 1;
741 else if (!strcmp (p, "-Wno-redundant-decls"))
742 warn_redundant_decls = 0;
743 else if (!strcmp (p, "-Wnested-externs"))
744 warn_nested_externs = 1;
745 else if (!strcmp (p, "-Wno-nested-externs"))
746 warn_nested_externs = 0;
747 else if (!strcmp (p, "-Wtraditional"))
748 warn_traditional = 1;
749 else if (!strcmp (p, "-Wno-traditional"))
750 warn_traditional = 0;
751 else if (!strncmp (p, "-Wformat=", 9))
752 warn_format = atol (p + 9);
753 else if (!strcmp (p, "-Wformat"))
755 else if (!strcmp (p, "-Wno-format"))
757 else if (!strcmp (p, "-Wchar-subscripts"))
758 warn_char_subscripts = 1;
759 else if (!strcmp (p, "-Wno-char-subscripts"))
760 warn_char_subscripts = 0;
761 else if (!strcmp (p, "-Wconversion"))
763 else if (!strcmp (p, "-Wno-conversion"))
765 else if (!strcmp (p, "-Wparentheses"))
766 warn_parentheses = 1;
767 else if (!strcmp (p, "-Wno-parentheses"))
768 warn_parentheses = 0;
769 else if (!strcmp (p, "-Wreturn-type"))
770 warn_return_type = 1;
771 else if (!strcmp (p, "-Wno-return-type"))
772 warn_return_type = 0;
773 else if (!strcmp (p, "-Wsequence-point"))
774 warn_sequence_point = 1;
775 else if (!strcmp (p, "-Wno-sequence-point"))
776 warn_sequence_point = 0;
777 else if (!strcmp (p, "-Wcomment"))
778 ; /* cpp handles this one. */
779 else if (!strcmp (p, "-Wno-comment"))
780 ; /* cpp handles this one. */
781 else if (!strcmp (p, "-Wcomments"))
782 ; /* cpp handles this one. */
783 else if (!strcmp (p, "-Wno-comments"))
784 ; /* cpp handles this one. */
785 else if (!strcmp (p, "-Wtrigraphs"))
786 ; /* cpp handles this one. */
787 else if (!strcmp (p, "-Wno-trigraphs"))
788 ; /* cpp handles this one. */
789 else if (!strcmp (p, "-Wundef"))
790 ; /* cpp handles this one. */
791 else if (!strcmp (p, "-Wno-undef"))
792 ; /* cpp handles this one. */
793 else if (!strcmp (p, "-Wimport"))
794 ; /* cpp handles this one. */
795 else if (!strcmp (p, "-Wno-import"))
796 ; /* cpp handles this one. */
797 else if (!strcmp (p, "-Wmissing-braces"))
798 warn_missing_braces = 1;
799 else if (!strcmp (p, "-Wno-missing-braces"))
800 warn_missing_braces = 0;
801 else if (!strcmp (p, "-Wmain"))
803 else if (!strcmp (p, "-Wno-main"))
805 else if (!strcmp (p, "-Wsign-compare"))
806 warn_sign_compare = 1;
807 else if (!strcmp (p, "-Wno-sign-compare"))
808 warn_sign_compare = 0;
809 else if (!strcmp (p, "-Wfloat-equal"))
810 warn_float_equal = 1;
811 else if (!strcmp (p, "-Wno-float-equal"))
812 warn_float_equal = 0;
813 else if (!strcmp (p, "-Wmultichar"))
815 else if (!strcmp (p, "-Wno-multichar"))
817 else if (!strcmp (p, "-Wunknown-pragmas"))
818 /* Set to greater than 1, so that even unknown pragmas in system
819 headers will be warned about. */
820 warn_unknown_pragmas = 2;
821 else if (!strcmp (p, "-Wno-unknown-pragmas"))
822 warn_unknown_pragmas = 0;
823 else if (!strcmp (p, "-Wall"))
825 /* We save the value of warn_uninitialized, since if they put
826 -Wuninitialized on the command line, we need to generate a
827 warning about not using it without also specifying -O. */
828 if (warn_uninitialized != 1)
829 warn_uninitialized = 2;
830 warn_implicit_int = 1;
831 mesg_implicit_function_declaration = 1;
832 warn_return_type = 1;
836 warn_char_subscripts = 1;
837 warn_parentheses = 1;
838 warn_sequence_point = 1;
839 warn_missing_braces = 1;
840 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
841 it off only if it's not explicit. */
843 /* Only warn about unknown pragmas that are not in system headers. */
844 warn_unknown_pragmas = 1;
847 return strings_processed;
852 /* Hooks for print_node. */
855 print_lang_decl (file, node, indent)
856 FILE *file ATTRIBUTE_UNUSED;
857 tree node ATTRIBUTE_UNUSED;
858 int indent ATTRIBUTE_UNUSED;
863 print_lang_type (file, node, indent)
864 FILE *file ATTRIBUTE_UNUSED;
865 tree node ATTRIBUTE_UNUSED;
866 int indent ATTRIBUTE_UNUSED;
871 print_lang_identifier (file, node, indent)
876 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
877 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
878 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
879 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
880 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
881 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
882 if (C_IS_RESERVED_WORD (node))
884 tree rid = ridpointers[C_RID_CODE (node)];
885 indent_to (file, indent + 4);
886 fprintf (file, "rid ");
887 fprintf (file, HOST_PTR_PRINTF, (void *)rid);
888 fprintf (file, " \"%s\"", IDENTIFIER_POINTER (rid));
892 /* Hook called at end of compilation to assume 1 elt
893 for a top-level tentative array defn that wasn't complete before. */
896 finish_incomplete_decl (decl)
899 if (TREE_CODE (decl) == VAR_DECL)
901 tree type = TREE_TYPE (decl);
902 if (type != error_mark_node
903 && TREE_CODE (type) == ARRAY_TYPE
904 && ! DECL_EXTERNAL (decl)
905 && TYPE_DOMAIN (type) == 0)
907 warning_with_decl (decl, "array `%s' assumed to have one element");
909 complete_array_type (type, NULL_TREE, 1);
911 layout_decl (decl, 0);
916 /* Create a new `struct binding_level'. */
918 static struct binding_level *
919 make_binding_level ()
922 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
925 /* Nonzero if we are currently in the global binding level. */
930 return current_binding_level == global_binding_level;
936 keep_next_level_flag = 1;
939 /* Nonzero if the current level needs to have a BLOCK made. */
944 return ((current_binding_level->keep_if_subblocks
945 && current_binding_level->blocks != 0)
946 || current_binding_level->keep
947 || current_binding_level->names != 0
948 || (current_binding_level->tags != 0
949 && !current_binding_level->tag_transparent));
952 /* Identify this binding level as a level of parameters.
953 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
954 But it turns out there is no way to pass the right value for
955 DEFINITION_FLAG, so we ignore it. */
958 declare_parm_level (definition_flag)
959 int definition_flag ATTRIBUTE_UNUSED;
961 current_binding_level->parm_flag = 1;
964 /* Nonzero if currently making parm declarations. */
969 return current_binding_level->parm_flag;
972 /* Enter a new binding level.
973 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
974 not for that of tags. */
977 pushlevel (tag_transparent)
980 register struct binding_level *newlevel = NULL_BINDING_LEVEL;
982 /* If this is the top level of a function,
983 just make sure that NAMED_LABELS is 0. */
985 if (current_binding_level == global_binding_level)
990 /* Reuse or create a struct for this binding level. */
992 if (free_binding_level)
994 newlevel = free_binding_level;
995 free_binding_level = free_binding_level->level_chain;
999 newlevel = make_binding_level ();
1002 /* Add this level to the front of the chain (stack) of levels that
1005 *newlevel = clear_binding_level;
1006 newlevel->tag_transparent
1008 || (current_binding_level
1009 ? current_binding_level->subblocks_tag_transparent
1011 newlevel->level_chain = current_binding_level;
1012 current_binding_level = newlevel;
1013 newlevel->keep = keep_next_level_flag;
1014 keep_next_level_flag = 0;
1015 newlevel->keep_if_subblocks = keep_next_if_subblocks;
1016 keep_next_if_subblocks = 0;
1019 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
1022 clear_limbo_values (block)
1027 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
1028 if (DECL_NAME (tem) != 0)
1029 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
1031 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
1032 clear_limbo_values (tem);
1035 /* Exit a binding level.
1036 Pop the level off, and restore the state of the identifier-decl mappings
1037 that were in effect when this level was entered.
1039 If KEEP is nonzero, this level had explicit declarations, so
1040 and create a "block" (a BLOCK node) for the level
1041 to record its declarations and subblocks for symbol table output.
1043 If FUNCTIONBODY is nonzero, this level is the body of a function,
1044 so create a block as if KEEP were set and also clear out all
1047 If REVERSE is nonzero, reverse the order of decls before putting
1048 them into the BLOCK. */
1051 poplevel (keep, reverse, functionbody)
1057 /* The chain of decls was accumulated in reverse order.
1058 Put it into forward order, just for cleanliness. */
1060 tree tags = current_binding_level->tags;
1061 tree subblocks = current_binding_level->blocks;
1064 int block_previously_created;
1066 keep |= current_binding_level->keep;
1068 /* This warning is turned off because it causes warnings for
1069 declarations like `extern struct foo *x'. */
1071 /* Warn about incomplete structure types in this level. */
1072 for (link = tags; link; link = TREE_CHAIN (link))
1073 if (!COMPLETE_TYPE_P (TREE_VALUE (link)))
1075 tree type = TREE_VALUE (link);
1076 tree type_name = TYPE_NAME (type);
1077 char *id = IDENTIFIER_POINTER (TREE_CODE (type_name) == IDENTIFIER_NODE
1079 : DECL_NAME (type_name));
1080 switch (TREE_CODE (type))
1083 error ("`struct %s' incomplete in scope ending here", id);
1086 error ("`union %s' incomplete in scope ending here", id);
1089 error ("`enum %s' incomplete in scope ending here", id);
1095 /* Get the decls in the order they were written.
1096 Usually current_binding_level->names is in reverse order.
1097 But parameter decls were previously put in forward order. */
1100 current_binding_level->names
1101 = decls = nreverse (current_binding_level->names);
1103 decls = current_binding_level->names;
1105 /* Output any nested inline functions within this block
1106 if they weren't already output. */
1108 for (decl = decls; decl; decl = TREE_CHAIN (decl))
1109 if (TREE_CODE (decl) == FUNCTION_DECL
1110 && ! TREE_ASM_WRITTEN (decl)
1111 && DECL_INITIAL (decl) != 0
1112 && TREE_ADDRESSABLE (decl))
1114 /* If this decl was copied from a file-scope decl
1115 on account of a block-scope extern decl,
1116 propagate TREE_ADDRESSABLE to the file-scope decl.
1118 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1119 true, since then the decl goes through save_for_inline_copying. */
1120 if (DECL_ABSTRACT_ORIGIN (decl) != 0
1121 && DECL_ABSTRACT_ORIGIN (decl) != decl)
1122 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
1125 /* We used to warn about unused variables in expand_end_bindings,
1126 i.e. while generating RTL. But in function-at-a-time mode we may
1127 choose to never expand a function at all (e.g. auto inlining), so
1128 we do this explicitly now. */
1129 warn_about_unused_variables (getdecls ());
1131 /* If there were any declarations or structure tags in that level,
1132 or if this level is a function body,
1133 create a BLOCK to record them for the life of this function. */
1136 block_previously_created = (current_binding_level->this_block != 0);
1137 if (block_previously_created)
1138 block = current_binding_level->this_block;
1139 else if (keep || functionbody
1140 || (current_binding_level->keep_if_subblocks && subblocks != 0))
1141 block = make_node (BLOCK);
1144 BLOCK_VARS (block) = decls;
1145 BLOCK_SUBBLOCKS (block) = subblocks;
1148 /* In each subblock, record that this is its superior. */
1150 for (link = subblocks; link; link = TREE_CHAIN (link))
1151 BLOCK_SUPERCONTEXT (link) = block;
1153 /* Clear out the meanings of the local variables of this level. */
1155 for (link = decls; link; link = TREE_CHAIN (link))
1157 if (DECL_NAME (link) != 0)
1159 /* If the ident. was used or addressed via a local extern decl,
1160 don't forget that fact. */
1161 if (DECL_EXTERNAL (link))
1163 if (TREE_USED (link))
1164 TREE_USED (DECL_NAME (link)) = 1;
1165 if (TREE_ADDRESSABLE (link))
1166 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1168 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1172 /* Restore all name-meanings of the outer levels
1173 that were shadowed by this level. */
1175 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1176 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1178 /* If the level being exited is the top level of a function,
1179 check over all the labels, and clear out the current
1180 (function local) meanings of their names. */
1184 clear_limbo_values (block);
1186 /* If this is the top level block of a function,
1187 the vars are the function's parameters.
1188 Don't leave them in the BLOCK because they are
1189 found in the FUNCTION_DECL instead. */
1191 BLOCK_VARS (block) = 0;
1193 /* Clear out the definitions of all label names,
1194 since their scopes end here,
1195 and add them to BLOCK_VARS. */
1197 for (link = named_labels; link; link = TREE_CHAIN (link))
1199 register tree label = TREE_VALUE (link);
1201 if (DECL_INITIAL (label) == 0)
1203 error_with_decl (label, "label `%s' used but not defined");
1204 /* Avoid crashing later. */
1205 define_label (input_filename, lineno,
1208 else if (warn_unused_label && !TREE_USED (label))
1209 warning_with_decl (label, "label `%s' defined but not used");
1210 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1212 /* Put the labels into the "variables" of the
1213 top-level block, so debugger can see them. */
1214 TREE_CHAIN (label) = BLOCK_VARS (block);
1215 BLOCK_VARS (block) = label;
1219 /* Pop the current level, and free the structure for reuse. */
1222 register struct binding_level *level = current_binding_level;
1223 current_binding_level = current_binding_level->level_chain;
1225 level->level_chain = free_binding_level;
1226 free_binding_level = level;
1229 /* Dispose of the block that we just made inside some higher level. */
1231 DECL_INITIAL (current_function_decl) = block;
1234 if (!block_previously_created)
1235 current_binding_level->blocks
1236 = chainon (current_binding_level->blocks, block);
1238 /* If we did not make a block for the level just exited,
1239 any blocks made for inner levels
1240 (since they cannot be recorded as subblocks in that level)
1241 must be carried forward so they will later become subblocks
1242 of something else. */
1244 current_binding_level->blocks
1245 = chainon (current_binding_level->blocks, subblocks);
1247 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1248 binding contour so that they point to the appropriate construct, i.e.
1249 either to the current FUNCTION_DECL node, or else to the BLOCK node
1250 we just constructed.
1252 Note that for tagged types whose scope is just the formal parameter
1253 list for some function type specification, we can't properly set
1254 their TYPE_CONTEXTs here, because we don't have a pointer to the
1255 appropriate FUNCTION_TYPE node readily available to us. For those
1256 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1257 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1258 node which will represent the "scope" for these "parameter list local"
1262 for (link = tags; link; link = TREE_CHAIN (link))
1263 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1265 for (link = tags; link; link = TREE_CHAIN (link))
1266 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1269 TREE_USED (block) = 1;
1274 /* Delete the node BLOCK from the current binding level.
1275 This is used for the block inside a stmt expr ({...})
1276 so that the block can be reinserted where appropriate. */
1279 delete_block (block)
1283 if (current_binding_level->blocks == block)
1284 current_binding_level->blocks = TREE_CHAIN (block);
1285 for (t = current_binding_level->blocks; t;)
1287 if (TREE_CHAIN (t) == block)
1288 TREE_CHAIN (t) = TREE_CHAIN (block);
1292 TREE_CHAIN (block) = NULL;
1293 /* Clear TREE_USED which is always set by poplevel.
1294 The flag is set again if insert_block is called. */
1295 TREE_USED (block) = 0;
1298 /* Insert BLOCK at the end of the list of subblocks of the
1299 current binding level. This is used when a BIND_EXPR is expanded,
1300 to handle the BLOCK node inside the BIND_EXPR. */
1303 insert_block (block)
1306 TREE_USED (block) = 1;
1307 current_binding_level->blocks
1308 = chainon (current_binding_level->blocks, block);
1311 /* Set the BLOCK node for the innermost scope
1312 (the one we are currently in). */
1316 register tree block;
1318 current_binding_level->this_block = block;
1324 register struct binding_level *newlevel;
1326 /* Reuse or create a struct for this binding level. */
1328 if (free_binding_level)
1330 newlevel = free_binding_level;
1331 free_binding_level = free_binding_level->level_chain;
1335 newlevel = make_binding_level ();
1338 /* Add this level to the front of the chain (stack) of label levels. */
1340 newlevel->level_chain = label_level_chain;
1341 label_level_chain = newlevel;
1343 newlevel->names = named_labels;
1344 newlevel->shadowed = shadowed_labels;
1346 shadowed_labels = 0;
1352 register struct binding_level *level = label_level_chain;
1355 /* Clear out the definitions of the declared labels in this level.
1356 Leave in the list any ordinary, non-declared labels. */
1357 for (link = named_labels, prev = 0; link;)
1359 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1361 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1363 error_with_decl (TREE_VALUE (link),
1364 "label `%s' used but not defined");
1365 /* Avoid crashing later. */
1366 define_label (input_filename, lineno,
1367 DECL_NAME (TREE_VALUE (link)));
1369 else if (warn_unused_label && !TREE_USED (TREE_VALUE (link)))
1370 warning_with_decl (TREE_VALUE (link),
1371 "label `%s' defined but not used");
1372 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1374 /* Delete this element from the list. */
1375 link = TREE_CHAIN (link);
1377 TREE_CHAIN (prev) = link;
1379 named_labels = link;
1384 link = TREE_CHAIN (link);
1388 /* Bring back all the labels that were shadowed. */
1389 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1390 if (DECL_NAME (TREE_VALUE (link)) != 0)
1391 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1392 = TREE_VALUE (link);
1394 named_labels = chainon (named_labels, level->names);
1395 shadowed_labels = level->shadowed;
1397 /* Pop the current level, and free the structure for reuse. */
1398 label_level_chain = label_level_chain->level_chain;
1399 level->level_chain = free_binding_level;
1400 free_binding_level = level;
1403 /* Push a definition or a declaration of struct, union or enum tag "name".
1404 "type" should be the type node.
1405 We assume that the tag "name" is not already defined.
1407 Note that the definition may really be just a forward reference.
1408 In that case, the TYPE_SIZE will be zero. */
1411 pushtag (name, type)
1414 register struct binding_level *b;
1416 /* Find the proper binding level for this type tag. */
1418 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1423 /* Record the identifier as the type's name if it has none. */
1425 if (TYPE_NAME (type) == 0)
1426 TYPE_NAME (type) = name;
1429 b->tags = tree_cons (name, type, b->tags);
1431 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1432 tagged type we just added to the current binding level. This fake
1433 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1434 to output a representation of a tagged type, and it also gives
1435 us a convenient place to record the "scope start" address for the
1438 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1440 /* An approximation for now, so we can tell this is a function-scope tag.
1441 This will be updated in poplevel. */
1442 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1445 /* Handle when a new declaration NEWDECL
1446 has the same name as an old one OLDDECL
1447 in the same binding contour.
1448 Prints an error message if appropriate.
1450 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1451 Otherwise, return 0.
1453 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1454 and OLDDECL is in an outer binding level and should thus not be changed. */
1457 duplicate_decls (newdecl, olddecl, different_binding_level)
1458 register tree newdecl, olddecl;
1459 int different_binding_level;
1461 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1462 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1463 && DECL_INITIAL (newdecl) != 0);
1464 tree oldtype = TREE_TYPE (olddecl);
1465 tree newtype = TREE_TYPE (newdecl);
1468 if (DECL_P (olddecl))
1469 DECL_MACHINE_ATTRIBUTES (newdecl)
1470 = merge_machine_decl_attributes (olddecl, newdecl);
1472 if (TREE_CODE (newtype) == ERROR_MARK
1473 || TREE_CODE (oldtype) == ERROR_MARK)
1476 /* New decl is completely inconsistent with the old one =>
1477 tell caller to replace the old one.
1478 This is always an error except in the case of shadowing a builtin. */
1479 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1481 if (TREE_CODE (olddecl) == FUNCTION_DECL
1482 && (DECL_BUILT_IN (olddecl)
1483 || DECL_BUILT_IN_NONANSI (olddecl)))
1485 /* If you declare a built-in or predefined function name as static,
1486 the old definition is overridden,
1487 but optionally warn this was a bad choice of name. */
1488 if (!TREE_PUBLIC (newdecl))
1492 else if (DECL_BUILT_IN (olddecl))
1493 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1495 warning_with_decl (newdecl, "shadowing library function `%s'");
1497 /* Likewise, if the built-in is not ansi, then programs can
1498 override it even globally without an error. */
1499 else if (! DECL_BUILT_IN (olddecl))
1500 warning_with_decl (newdecl,
1501 "library function `%s' declared as non-function");
1503 else if (DECL_BUILT_IN_NONANSI (olddecl))
1504 warning_with_decl (newdecl,
1505 "built-in function `%s' declared as non-function");
1507 warning_with_decl (newdecl,
1508 "built-in function `%s' declared as non-function");
1512 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1513 error_with_decl (olddecl, "previous declaration of `%s'");
1519 /* For real parm decl following a forward decl,
1520 return 1 so old decl will be reused. */
1521 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1522 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1525 /* The new declaration is the same kind of object as the old one.
1526 The declarations may partially match. Print warnings if they don't
1527 match enough. Ultimately, copy most of the information from the new
1528 decl to the old one, and keep using the old one. */
1530 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1531 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1532 && DECL_INITIAL (olddecl) == 0)
1533 /* If -traditional, avoid error for redeclaring fcn
1534 after implicit decl. */
1536 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1537 && DECL_BUILT_IN (olddecl))
1539 /* A function declaration for a built-in function. */
1540 if (!TREE_PUBLIC (newdecl))
1542 /* If you declare a built-in function name as static, the
1543 built-in definition is overridden,
1544 but optionally warn this was a bad choice of name. */
1546 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1547 /* Discard the old built-in function. */
1550 else if (!types_match)
1552 /* Accept the return type of the new declaration if same modes. */
1553 tree oldreturntype = TREE_TYPE (oldtype);
1554 tree newreturntype = TREE_TYPE (newtype);
1556 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1558 /* Function types may be shared, so we can't just modify
1559 the return type of olddecl's function type. */
1561 = build_function_type (newreturntype,
1562 TYPE_ARG_TYPES (oldtype));
1564 types_match = comptypes (newtype, trytype);
1568 /* Accept harmless mismatch in first argument type also.
1570 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1571 && TYPE_ARG_TYPES (oldtype) != 0
1572 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1573 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1574 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1575 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1577 /* Function types may be shared, so we can't just modify
1578 the return type of olddecl's function type. */
1580 = build_function_type (TREE_TYPE (oldtype),
1581 tree_cons (NULL_TREE,
1582 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1583 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1585 types_match = comptypes (newtype, trytype);
1589 if (! different_binding_level)
1590 TREE_TYPE (olddecl) = oldtype;
1594 /* If types don't match for a built-in, throw away the built-in. */
1595 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1599 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1600 && DECL_SOURCE_LINE (olddecl) == 0)
1602 /* A function declaration for a predeclared function
1603 that isn't actually built in. */
1604 if (!TREE_PUBLIC (newdecl))
1606 /* If you declare it as static, the
1607 default definition is overridden. */
1610 else if (!types_match)
1612 /* If the types don't match, preserve volatility indication.
1613 Later on, we will discard everything else about the
1614 default declaration. */
1615 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1618 /* Permit char *foo () to match void *foo (...) if not pedantic,
1619 if one of them came from a system header file. */
1620 else if (!types_match
1621 && TREE_CODE (olddecl) == FUNCTION_DECL
1622 && TREE_CODE (newdecl) == FUNCTION_DECL
1623 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1624 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1625 && (DECL_IN_SYSTEM_HEADER (olddecl)
1626 || DECL_IN_SYSTEM_HEADER (newdecl))
1627 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1628 && TYPE_ARG_TYPES (oldtype) == 0
1629 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1630 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1632 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1633 && TYPE_ARG_TYPES (newtype) == 0
1634 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1635 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1638 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1639 /* Make sure we keep void * as ret type, not char *. */
1640 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1641 TREE_TYPE (newdecl) = newtype = oldtype;
1643 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1644 we will come back here again. */
1645 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1647 else if (!types_match
1648 /* Permit char *foo (int, ...); followed by char *foo ();
1650 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1652 /* Return types must still match. */
1653 && comptypes (TREE_TYPE (oldtype),
1654 TREE_TYPE (newtype))
1655 && TYPE_ARG_TYPES (newtype) == 0))
1657 error_with_decl (newdecl, "conflicting types for `%s'");
1658 /* Check for function type mismatch
1659 involving an empty arglist vs a nonempty one. */
1660 if (TREE_CODE (olddecl) == FUNCTION_DECL
1661 && comptypes (TREE_TYPE (oldtype),
1662 TREE_TYPE (newtype))
1663 && ((TYPE_ARG_TYPES (oldtype) == 0
1664 && DECL_INITIAL (olddecl) == 0)
1666 (TYPE_ARG_TYPES (newtype) == 0
1667 && DECL_INITIAL (newdecl) == 0)))
1669 /* Classify the problem further. */
1670 register tree t = TYPE_ARG_TYPES (oldtype);
1672 t = TYPE_ARG_TYPES (newtype);
1673 for (; t; t = TREE_CHAIN (t))
1675 register tree type = TREE_VALUE (t);
1677 if (TREE_CHAIN (t) == 0
1678 && TYPE_MAIN_VARIANT (type) != void_type_node)
1680 error ("A parameter list with an ellipsis can't match an empty parameter name list declaration.");
1684 if (simple_type_promotes_to (type) != NULL_TREE)
1686 error ("An argument type that has a default promotion can't match an empty parameter name list declaration.");
1691 error_with_decl (olddecl, "previous declaration of `%s'");
1695 errmsg = redeclaration_error_message (newdecl, olddecl);
1701 error_with_decl (newdecl, "redefinition of `%s'");
1704 error_with_decl (newdecl, "redeclaration of `%s'");
1707 error_with_decl (newdecl, "conflicting declarations of `%s'");
1713 error_with_decl (olddecl,
1714 ((DECL_INITIAL (olddecl)
1715 && current_binding_level == global_binding_level)
1716 ? "`%s' previously defined here"
1717 : "`%s' previously declared here"));
1719 else if (TREE_CODE (newdecl) == TYPE_DECL
1720 && (DECL_IN_SYSTEM_HEADER (olddecl)
1721 || DECL_IN_SYSTEM_HEADER (newdecl)))
1723 warning_with_decl (newdecl, "redefinition of `%s'");
1726 ((DECL_INITIAL (olddecl)
1727 && current_binding_level == global_binding_level)
1728 ? "`%s' previously defined here"
1729 : "`%s' previously declared here"));
1731 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1732 && DECL_INITIAL (olddecl) != 0
1733 && TYPE_ARG_TYPES (oldtype) == 0
1734 && TYPE_ARG_TYPES (newtype) != 0
1735 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1737 register tree type, parm;
1739 /* Prototype decl follows defn w/o prototype. */
1741 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1742 type = TYPE_ARG_TYPES (newtype),
1745 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1747 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1748 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1750 warning_with_decl (newdecl, "prototype for `%s' follows");
1751 warning_with_decl (olddecl, "non-prototype definition here");
1754 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1755 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1757 error_with_decl (newdecl,
1758 "prototype for `%s' follows and number of arguments doesn't match");
1759 error_with_decl (olddecl, "non-prototype definition here");
1763 /* Type for passing arg must be consistent
1764 with that declared for the arg. */
1765 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1766 /* If -traditional, allow `unsigned int' instead of `int'
1767 in the prototype. */
1768 && (! (flag_traditional
1769 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1770 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1772 error_with_decl (newdecl,
1773 "prototype for `%s' follows and argument %d doesn't match",
1775 error_with_decl (olddecl, "non-prototype definition here");
1781 /* Warn about mismatches in various flags. */
1784 /* Warn if function is now inline
1785 but was previously declared not inline and has been called. */
1786 if (TREE_CODE (olddecl) == FUNCTION_DECL
1787 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1788 && TREE_USED (olddecl))
1789 warning_with_decl (newdecl,
1790 "`%s' declared inline after being called");
1791 if (TREE_CODE (olddecl) == FUNCTION_DECL
1792 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1793 && DECL_INITIAL (olddecl) != 0)
1794 warning_with_decl (newdecl,
1795 "`%s' declared inline after its definition");
1797 /* If pedantic, warn when static declaration follows a non-static
1798 declaration. Otherwise, do so only for functions. */
1799 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1800 && TREE_PUBLIC (olddecl)
1801 && !TREE_PUBLIC (newdecl))
1802 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1804 /* If warn_traditional, warn when a non-static function
1805 declaration follows a static one. */
1806 if (warn_traditional && !in_system_header
1807 && TREE_CODE (olddecl) == FUNCTION_DECL
1808 && !TREE_PUBLIC (olddecl)
1809 && TREE_PUBLIC (newdecl))
1810 warning_with_decl (newdecl, "non-static declaration for `%s' follows static");
1812 /* Warn when const declaration follows a non-const
1813 declaration, but not for functions. */
1814 if (TREE_CODE (olddecl) != FUNCTION_DECL
1815 && !TREE_READONLY (olddecl)
1816 && TREE_READONLY (newdecl))
1817 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1818 /* These bits are logically part of the type, for variables.
1819 But not for functions
1820 (where qualifiers are not valid ANSI anyway). */
1821 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1822 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1823 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1824 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1828 /* Optionally warn about more than one declaration for the same name. */
1829 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1830 /* Don't warn about a function declaration
1831 followed by a definition. */
1832 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1833 && DECL_INITIAL (olddecl) == 0)
1834 /* Don't warn about extern decl followed by (tentative) definition. */
1835 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1837 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1838 warning_with_decl (olddecl, "previous declaration of `%s'");
1841 /* Copy all the DECL_... slots specified in the new decl
1842 except for any that we copy here from the old type.
1844 Past this point, we don't change OLDTYPE and NEWTYPE
1845 even if we change the types of NEWDECL and OLDDECL. */
1849 /* When copying info to olddecl, we store into write_olddecl
1850 instead. This allows us to avoid modifying olddecl when
1851 different_binding_level is true. */
1852 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1854 /* Merge the data types specified in the two decls. */
1855 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1857 if (different_binding_level)
1859 = build_type_attribute_variant
1861 merge_attributes (TYPE_ATTRIBUTES (newtype),
1862 TYPE_ATTRIBUTES (oldtype)));
1865 = TREE_TYPE (olddecl)
1866 = common_type (newtype, oldtype);
1869 /* Lay the type out, unless already done. */
1870 if (oldtype != TREE_TYPE (newdecl))
1872 if (TREE_TYPE (newdecl) != error_mark_node)
1873 layout_type (TREE_TYPE (newdecl));
1874 if (TREE_CODE (newdecl) != FUNCTION_DECL
1875 && TREE_CODE (newdecl) != TYPE_DECL
1876 && TREE_CODE (newdecl) != CONST_DECL)
1877 layout_decl (newdecl, 0);
1881 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1882 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1883 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1884 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1885 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1886 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1888 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1889 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1893 /* Keep the old rtl since we can safely use it. */
1894 DECL_RTL (newdecl) = DECL_RTL (olddecl);
1896 /* Merge the type qualifiers. */
1897 if (TREE_CODE (olddecl) == FUNCTION_DECL
1898 && DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1899 && ! TREE_THIS_VOLATILE (newdecl))
1900 TREE_THIS_VOLATILE (write_olddecl) = 0;
1902 if (TREE_READONLY (newdecl))
1903 TREE_READONLY (write_olddecl) = 1;
1905 if (TREE_THIS_VOLATILE (newdecl))
1907 TREE_THIS_VOLATILE (write_olddecl) = 1;
1908 if (TREE_CODE (newdecl) == VAR_DECL
1909 /* If an automatic variable is re-declared in the same
1910 function scope, but the old declaration was not
1911 volatile, make_var_volatile() would crash because the
1912 variable would have been assigned to a pseudo, not a
1913 MEM. Since this duplicate declaration is invalid
1914 anyway, we just skip the call. */
1916 make_var_volatile (newdecl);
1919 /* Keep source location of definition rather than declaration. */
1920 /* When called with different_binding_level set, keep the old
1921 information so that meaningful diagnostics can be given. */
1922 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1923 && ! different_binding_level)
1925 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1926 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1929 /* Merge the unused-warning information. */
1930 if (DECL_IN_SYSTEM_HEADER (olddecl))
1931 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1932 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1933 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1935 /* Merge the initialization information. */
1936 /* When called with different_binding_level set, don't copy over
1937 DECL_INITIAL, so that we don't accidentally change function
1938 declarations into function definitions. */
1939 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1940 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1942 /* Merge the section attribute.
1943 We want to issue an error if the sections conflict but that must be
1944 done later in decl_attributes since we are called before attributes
1946 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1947 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1949 /* Copy the assembler name.
1950 Currently, it can only be defined in the prototype. */
1951 DECL_ASSEMBLER_NAME (newdecl) = DECL_ASSEMBLER_NAME (olddecl);
1953 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1955 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1956 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1958 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1959 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1960 DECL_NO_CHECK_MEMORY_USAGE (newdecl)
1961 |= DECL_NO_CHECK_MEMORY_USAGE (olddecl);
1962 DECL_NO_LIMIT_STACK (newdecl)
1963 |= DECL_NO_LIMIT_STACK (olddecl);
1966 /* If cannot merge, then use the new type and qualifiers,
1967 and don't preserve the old rtl. */
1968 else if (! different_binding_level)
1970 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1971 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1972 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1973 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1976 /* Merge the storage class information. */
1977 DECL_WEAK (newdecl) |= DECL_WEAK (olddecl);
1978 /* For functions, static overrides non-static. */
1979 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1981 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1982 /* This is since we don't automatically
1983 copy the attributes of NEWDECL into OLDDECL. */
1984 /* No need to worry about different_binding_level here because
1985 then TREE_PUBLIC (newdecl) was true. */
1986 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1987 /* If this clears `static', clear it in the identifier too. */
1988 if (! TREE_PUBLIC (olddecl))
1989 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1991 if (DECL_EXTERNAL (newdecl))
1993 if (! different_binding_level)
1995 /* Don't mess with these flags on local externs; they remain
1996 external even if there's a declaration at file scope which
1998 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1999 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
2001 /* An extern decl does not override previous storage class. */
2002 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
2003 if (! DECL_EXTERNAL (newdecl))
2004 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
2008 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
2009 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
2012 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2014 /* If either decl says `inline', this fn is inline,
2015 unless its definition was passed already. */
2016 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
2017 DECL_INLINE (olddecl) = 1;
2019 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
2021 if (DECL_BUILT_IN (olddecl))
2023 /* Get rid of any built-in function if new arg types don't match it
2024 or if we have a function definition. */
2025 if (! types_match || new_is_definition)
2027 if (! different_binding_level)
2029 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
2030 DECL_BUILT_IN_CLASS (olddecl) = NOT_BUILT_IN;
2035 /* If redeclaring a builtin function, and not a definition,
2036 it stays built in. */
2037 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2038 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2041 /* Also preserve various other info from the definition. */
2042 else if (! new_is_definition)
2043 DECL_FRAME_SIZE (newdecl) = DECL_FRAME_SIZE (olddecl);
2044 if (! new_is_definition)
2046 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2047 /* When called with different_binding_level set, don't copy over
2048 DECL_INITIAL, so that we don't accidentally change function
2049 declarations into function definitions. */
2050 if (! different_binding_level)
2051 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2052 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
2053 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2054 if (DECL_INLINE (newdecl))
2055 DECL_ABSTRACT_ORIGIN (newdecl) = DECL_ABSTRACT_ORIGIN (olddecl);
2058 if (different_binding_level)
2061 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2062 But preserve OLDDECL's DECL_UID. */
2064 register unsigned olddecl_uid = DECL_UID (olddecl);
2066 memcpy ((char *) olddecl + sizeof (struct tree_common),
2067 (char *) newdecl + sizeof (struct tree_common),
2068 sizeof (struct tree_decl) - sizeof (struct tree_common));
2069 DECL_UID (olddecl) = olddecl_uid;
2072 /* NEWDECL contains the merged attribute lists.
2073 Update OLDDECL to be the same. */
2074 DECL_MACHINE_ATTRIBUTES (olddecl) = DECL_MACHINE_ATTRIBUTES (newdecl);
2079 /* Record a decl-node X as belonging to the current lexical scope.
2080 Check for errors (such as an incompatible declaration for the same
2081 name already seen in the same scope).
2083 Returns either X or an old decl for the same name.
2084 If an old decl is returned, it may have been smashed
2085 to agree with what X says. */
2092 register tree name = DECL_NAME (x);
2093 register struct binding_level *b = current_binding_level;
2095 DECL_CONTEXT (x) = current_function_decl;
2096 /* A local extern declaration for a function doesn't constitute nesting.
2097 A local auto declaration does, since it's a forward decl
2098 for a nested function coming later. */
2099 if ((TREE_CODE (x) == FUNCTION_DECL || TREE_CODE (x) == VAR_DECL)
2100 && DECL_INITIAL (x) == 0 && DECL_EXTERNAL (x))
2101 DECL_CONTEXT (x) = 0;
2103 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
2104 && x != IDENTIFIER_IMPLICIT_DECL (name)
2105 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
2106 && !DECL_IN_SYSTEM_HEADER (x))
2107 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
2113 int different_binding_level = 0;
2115 t = lookup_name_current_level (name);
2116 /* Don't type check externs here when -traditional. This is so that
2117 code with conflicting declarations inside blocks will get warnings
2118 not errors. X11 for instance depends on this. */
2119 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
2121 t = IDENTIFIER_GLOBAL_VALUE (name);
2122 /* Type decls at global scope don't conflict with externs declared
2123 inside lexical blocks. */
2124 if (t && TREE_CODE (t) == TYPE_DECL)
2126 different_binding_level = 1;
2128 if (t != 0 && t == error_mark_node)
2129 /* error_mark_node is 0 for a while during initialization! */
2132 error_with_decl (x, "`%s' used prior to declaration");
2137 file = DECL_SOURCE_FILE (t);
2138 line = DECL_SOURCE_LINE (t);
2141 /* If this decl is `static' and an implicit decl was seen previously,
2142 warn. But don't complain if -traditional,
2143 since traditional compilers don't complain. */
2144 if (! flag_traditional && TREE_PUBLIC (name)
2145 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2146 sets this for all functions. */
2147 && ! TREE_PUBLIC (x)
2148 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2149 /* We used to warn also for explicit extern followed by static,
2150 but sometimes you need to do it that way. */
2151 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2153 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2154 IDENTIFIER_POINTER (name));
2155 pedwarn_with_file_and_line
2156 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2157 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2158 "previous declaration of `%s'",
2159 IDENTIFIER_POINTER (name));
2160 TREE_THIS_VOLATILE (name) = 1;
2163 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2165 if (TREE_CODE (t) == PARM_DECL)
2167 /* Don't allow more than one "real" duplicate
2168 of a forward parm decl. */
2169 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2175 /* If we are processing a typedef statement, generate a whole new
2176 ..._TYPE node (which will be just an variant of the existing
2177 ..._TYPE node with identical properties) and then install the
2178 TYPE_DECL node generated to represent the typedef name as the
2179 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2181 The whole point here is to end up with a situation where each
2182 and every ..._TYPE node the compiler creates will be uniquely
2183 associated with AT MOST one node representing a typedef name.
2184 This way, even though the compiler substitutes corresponding
2185 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2186 early on, later parts of the compiler can always do the reverse
2187 translation and get back the corresponding typedef name. For
2190 typedef struct S MY_TYPE;
2193 Later parts of the compiler might only know that `object' was of
2194 type `struct S' if it were not for code just below. With this
2195 code however, later parts of the compiler see something like:
2197 struct S' == struct S
2198 typedef struct S' MY_TYPE;
2201 And they can then deduce (from the node for type struct S') that
2202 the original object declaration was:
2206 Being able to do this is important for proper support of protoize,
2207 and also for generating precise symbolic debugging information
2208 which takes full account of the programmer's (typedef) vocabulary.
2210 Obviously, we don't want to generate a duplicate ..._TYPE node if
2211 the TYPE_DECL node that we are now processing really represents a
2212 standard built-in type.
2214 Since all standard types are effectively declared at line zero
2215 in the source file, we can easily check to see if we are working
2216 on a standard type by checking the current value of lineno. */
2218 if (TREE_CODE (x) == TYPE_DECL)
2220 if (DECL_SOURCE_LINE (x) == 0)
2222 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2223 TYPE_NAME (TREE_TYPE (x)) = x;
2225 else if (TREE_TYPE (x) != error_mark_node
2226 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2228 tree tt = TREE_TYPE (x);
2229 DECL_ORIGINAL_TYPE (x) = tt;
2230 tt = build_type_copy (tt);
2232 TREE_USED (tt) = TREE_USED (x);
2237 /* Multiple external decls of the same identifier ought to match.
2238 Check against both global declarations (when traditional) and out of
2239 scope (limbo) block level declarations.
2241 We get warnings about inline functions where they are defined.
2242 Avoid duplicate warnings where they are used. */
2244 && ! (TREE_CODE (x) == FUNCTION_DECL && DECL_INLINE (x)))
2248 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2249 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2250 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2251 decl = IDENTIFIER_GLOBAL_VALUE (name);
2252 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2253 /* Decls in limbo are always extern, so no need to check that. */
2254 decl = IDENTIFIER_LIMBO_VALUE (name);
2258 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2259 /* If old decl is built-in, we already warned if we should. */
2260 && !DECL_BUILT_IN (decl))
2262 pedwarn_with_decl (x,
2263 "type mismatch with previous external decl");
2264 pedwarn_with_decl (decl, "previous external decl of `%s'");
2268 /* If a function has had an implicit declaration, and then is defined,
2269 make sure they are compatible. */
2271 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2272 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2273 && TREE_CODE (x) == FUNCTION_DECL
2274 && ! comptypes (TREE_TYPE (x),
2275 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2277 warning_with_decl (x, "type mismatch with previous implicit declaration");
2278 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2279 "previous implicit declaration of `%s'");
2282 /* In PCC-compatibility mode, extern decls of vars with no current decl
2283 take effect at top level no matter where they are. */
2284 if (flag_traditional && DECL_EXTERNAL (x)
2285 && lookup_name (name) == 0)
2287 tree type = TREE_TYPE (x);
2289 /* But don't do this if the type contains temporary nodes. */
2292 if (type == error_mark_node)
2294 if (TYPE_CONTEXT (type))
2296 warning_with_decl (x, "type of external `%s' is not global");
2297 /* By exiting the loop early, we leave TYPE nonzero,
2298 and thus prevent globalization of the decl. */
2301 else if (TREE_CODE (type) == FUNCTION_TYPE
2302 && TYPE_ARG_TYPES (type) != 0)
2303 /* The types might not be truly local,
2304 but the list of arg types certainly is temporary.
2305 Since prototypes are nontraditional,
2306 ok not to do the traditional thing. */
2308 type = TREE_TYPE (type);
2312 b = global_binding_level;
2315 /* This name is new in its binding level.
2316 Install the new declaration and return it. */
2317 if (b == global_binding_level)
2319 /* Install a global value. */
2321 /* If the first global decl has external linkage,
2322 warn if we later see static one. */
2323 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2324 TREE_PUBLIC (name) = 1;
2326 IDENTIFIER_GLOBAL_VALUE (name) = x;
2328 /* We no longer care about any previous block level declarations. */
2329 IDENTIFIER_LIMBO_VALUE (name) = 0;
2331 /* Don't forget if the function was used via an implicit decl. */
2332 if (IDENTIFIER_IMPLICIT_DECL (name)
2333 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2334 TREE_USED (x) = 1, TREE_USED (name) = 1;
2336 /* Don't forget if its address was taken in that way. */
2337 if (IDENTIFIER_IMPLICIT_DECL (name)
2338 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2339 TREE_ADDRESSABLE (x) = 1;
2341 /* Warn about mismatches against previous implicit decl. */
2342 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2343 /* If this real decl matches the implicit, don't complain. */
2344 && ! (TREE_CODE (x) == FUNCTION_DECL
2345 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2346 == integer_type_node)))
2347 pedwarn ("`%s' was previously implicitly declared to return `int'",
2348 IDENTIFIER_POINTER (name));
2350 /* If this decl is `static' and an `extern' was seen previously,
2351 that is erroneous. */
2352 if (TREE_PUBLIC (name)
2353 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2355 /* Okay to redeclare an ANSI built-in as static. */
2356 if (t != 0 && DECL_BUILT_IN (t))
2358 /* Okay to declare a non-ANSI built-in as anything. */
2359 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2361 /* Okay to have global type decl after an earlier extern
2362 declaration inside a lexical block. */
2363 else if (TREE_CODE (x) == TYPE_DECL)
2365 else if (IDENTIFIER_IMPLICIT_DECL (name))
2367 if (! TREE_THIS_VOLATILE (name))
2368 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2369 IDENTIFIER_POINTER (name));
2372 pedwarn ("`%s' was declared `extern' and later `static'",
2373 IDENTIFIER_POINTER (name));
2378 /* Here to install a non-global value. */
2379 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2380 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2382 IDENTIFIER_LOCAL_VALUE (name) = x;
2384 /* If this is an extern function declaration, see if we
2385 have a global definition or declaration for the function. */
2388 && TREE_CODE (x) == FUNCTION_DECL
2389 && TREE_CODE (oldglobal) == FUNCTION_DECL
2390 && DECL_EXTERNAL (x) && ! DECL_INLINE (x))
2392 /* We have one. Their types must agree. */
2393 if (! comptypes (TREE_TYPE (x),
2394 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2395 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2398 /* Inner extern decl is inline if global one is.
2399 Copy enough to really inline it. */
2400 if (DECL_INLINE (oldglobal))
2402 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2403 DECL_INITIAL (x) = (current_function_decl == oldglobal
2404 ? 0 : DECL_INITIAL (oldglobal));
2405 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2406 DECL_FRAME_SIZE (x) = DECL_FRAME_SIZE (oldglobal);
2407 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2408 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2409 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2410 DECL_ABSTRACT_ORIGIN (x)
2411 = DECL_ABSTRACT_ORIGIN (oldglobal);
2413 /* Inner extern decl is built-in if global one is. */
2414 if (DECL_BUILT_IN (oldglobal))
2416 DECL_BUILT_IN_CLASS (x) = DECL_BUILT_IN_CLASS (oldglobal);
2417 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2419 /* Keep the arg types from a file-scope fcn defn. */
2420 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2421 && DECL_INITIAL (oldglobal)
2422 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2423 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2428 /* This case is probably sometimes the right thing to do. */
2429 /* If we have a local external declaration,
2430 then any file-scope declaration should not
2431 have been static. */
2432 if (oldlocal == 0 && oldglobal != 0
2433 && !TREE_PUBLIC (oldglobal)
2434 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2435 warning ("`%s' locally external but globally static",
2436 IDENTIFIER_POINTER (name));
2439 /* If we have a local external declaration,
2440 and no file-scope declaration has yet been seen,
2441 then if we later have a file-scope decl it must not be static. */
2443 && DECL_EXTERNAL (x)
2447 TREE_PUBLIC (name) = 1;
2449 /* Save this decl, so that we can do type checking against
2450 other decls after it falls out of scope.
2452 Only save it once. This prevents temporary decls created in
2453 expand_inline_function from being used here, since this
2454 will have been set when the inline function was parsed.
2455 It also helps give slightly better warnings. */
2456 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2457 IDENTIFIER_LIMBO_VALUE (name) = x;
2460 /* Warn if shadowing an argument at the top level of the body. */
2461 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2462 /* This warning doesn't apply to the parms of a nested fcn. */
2463 && ! current_binding_level->parm_flag
2464 /* Check that this is one level down from the parms. */
2465 && current_binding_level->level_chain->parm_flag
2466 /* Check that the decl being shadowed
2467 comes from the parm level, one level up. */
2468 && chain_member (oldlocal, current_binding_level->level_chain->names))
2470 if (TREE_CODE (oldlocal) == PARM_DECL)
2471 pedwarn ("declaration of `%s' shadows a parameter",
2472 IDENTIFIER_POINTER (name));
2474 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2475 IDENTIFIER_POINTER (name));
2478 /* Maybe warn if shadowing something else. */
2479 else if (warn_shadow && !DECL_EXTERNAL (x)
2480 /* No shadow warnings for internally generated vars. */
2481 && DECL_SOURCE_LINE (x) != 0
2482 /* No shadow warnings for vars made for inlining. */
2483 && ! DECL_FROM_INLINE (x))
2485 const char *id = IDENTIFIER_POINTER (name);
2487 if (TREE_CODE (x) == PARM_DECL
2488 && current_binding_level->level_chain->parm_flag)
2489 /* Don't warn about the parm names in function declarator
2490 within a function declarator.
2491 It would be nice to avoid warning in any function
2492 declarator in a declaration, as opposed to a definition,
2493 but there is no way to tell it's not a definition. */
2495 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2496 warning ("declaration of `%s' shadows a parameter", id);
2497 else if (oldlocal != 0)
2498 warning ("declaration of `%s' shadows previous local", id);
2499 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2500 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2501 warning ("declaration of `%s' shadows global declaration", id);
2504 /* If storing a local value, there may already be one (inherited).
2505 If so, record it for restoration when this binding level ends. */
2507 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2510 /* Keep count of variables in this level with incomplete type.
2511 If the input is erroneous, we can have error_mark in the type
2512 slot (e.g. "f(void a, ...)") - that doesn't count as an
2514 if (TREE_TYPE (x) != error_mark_node
2515 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2519 /* Put decls on list in reverse order.
2520 We will reverse them later if necessary. */
2521 TREE_CHAIN (x) = b->names;
2527 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2530 pushdecl_top_level (x)
2534 register struct binding_level *b = current_binding_level;
2536 current_binding_level = global_binding_level;
2538 current_binding_level = b;
2542 /* Generate an implicit declaration for identifier FUNCTIONID
2543 as a function of type int (). Print a warning if appropriate. */
2546 implicitly_declare (functionid)
2550 int traditional_warning = 0;
2551 /* Only one "implicit declaration" warning per identifier. */
2552 int implicit_warning;
2554 /* We used to reuse an old implicit decl here,
2555 but this loses with inline functions because it can clobber
2556 the saved decl chains. */
2558 if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2559 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2562 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2564 /* Warn of implicit decl following explicit local extern decl.
2565 This is probably a program designed for traditional C. */
2566 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2567 traditional_warning = 1;
2569 /* Warn once of an implicit declaration. */
2570 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2572 DECL_EXTERNAL (decl) = 1;
2573 TREE_PUBLIC (decl) = 1;
2575 /* Record that we have an implicit decl and this is it. */
2576 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2578 /* ANSI standard says implicit declarations are in the innermost block.
2579 So we record the decl in the standard fashion.
2580 If flag_traditional is set, pushdecl does it top-level. */
2583 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2584 maybe_objc_check_decl (decl);
2586 rest_of_decl_compilation (decl, NULL_PTR, 0, 0);
2588 if (implicit_warning)
2589 implicit_decl_warning (functionid);
2590 else if (warn_traditional && traditional_warning)
2591 warning ("function `%s' was previously declared within a block",
2592 IDENTIFIER_POINTER (functionid));
2594 /* Write a record describing this implicit function declaration to the
2595 prototypes file (if requested). */
2597 gen_aux_info_record (decl, 0, 1, 0);
2603 implicit_decl_warning (id)
2606 const char *name = IDENTIFIER_POINTER (id);
2607 if (mesg_implicit_function_declaration == 2)
2608 error ("implicit declaration of function `%s'", name);
2609 else if (mesg_implicit_function_declaration == 1)
2610 warning ("implicit declaration of function `%s'", name);
2613 /* Return zero if the declaration NEWDECL is valid
2614 when the declaration OLDDECL (assumed to be for the same name)
2615 has already been seen.
2616 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
2617 and 3 if it is a conflicting declaration. */
2620 redeclaration_error_message (newdecl, olddecl)
2621 tree newdecl, olddecl;
2623 if (TREE_CODE (newdecl) == TYPE_DECL)
2625 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2627 /* pushdecl creates distinct types for TYPE_DECLs by calling
2628 build_type_copy, so the above comparison generally fails. We do
2629 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2630 is equivalent to what this code used to do before the build_type_copy
2631 call. The variant type distinction should not matter for traditional
2632 code, because it doesn't have type qualifiers. */
2633 if (flag_traditional
2634 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
2636 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2640 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2642 /* Declarations of functions can insist on internal linkage
2643 but they can't be inconsistent with internal linkage,
2644 so there can be no error on that account.
2645 However defining the same name twice is no good. */
2646 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2647 /* However, defining once as extern inline and a second
2648 time in another way is ok. */
2649 && ! (DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2650 && ! (DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2654 else if (DECL_CONTEXT (newdecl) == NULL_TREE)
2656 /* Objects declared at top level: */
2657 /* If at least one is a reference, it's ok. */
2658 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2660 /* Reject two definitions. */
2661 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2663 /* Now we have two tentative defs, or one tentative and one real def. */
2664 /* Insist that the linkage match. */
2665 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2669 else if (current_binding_level->parm_flag
2670 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2674 /* Newdecl has block scope. If olddecl has block scope also, then
2675 reject two definitions, and reject a definition together with an
2676 external reference. Otherwise, it is OK, because newdecl must
2677 be an extern reference to olddecl. */
2678 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2679 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2685 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2686 Create one if none exists so far for the current function.
2687 This function is called for both label definitions and label references. */
2693 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2695 if (current_function_decl == 0)
2697 error ("label %s referenced outside of any function",
2698 IDENTIFIER_POINTER (id));
2702 /* Use a label already defined or ref'd with this name. */
2705 /* But not if it is inherited and wasn't declared to be inheritable. */
2706 if (DECL_CONTEXT (decl) != current_function_decl
2707 && ! C_DECLARED_LABEL_FLAG (decl))
2708 return shadow_label (id);
2712 decl = build_decl (LABEL_DECL, id, void_type_node);
2714 /* A label not explicitly declared must be local to where it's ref'd. */
2715 DECL_CONTEXT (decl) = current_function_decl;
2717 DECL_MODE (decl) = VOIDmode;
2719 /* Say where one reference is to the label,
2720 for the sake of the error if it is not defined. */
2721 DECL_SOURCE_LINE (decl) = lineno;
2722 DECL_SOURCE_FILE (decl) = input_filename;
2724 IDENTIFIER_LABEL_VALUE (id) = decl;
2726 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2731 /* Make a label named NAME in the current function,
2732 shadowing silently any that may be inherited from containing functions
2733 or containing scopes.
2735 Note that valid use, if the label being shadowed
2736 comes from another scope in the same function,
2737 requires calling declare_nonlocal_label right away. */
2743 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2749 /* Check to make sure that the label hasn't already been declared
2750 at this label scope */
2751 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2752 if (TREE_VALUE (dup) == decl)
2754 error ("duplicate label declaration `%s'",
2755 IDENTIFIER_POINTER (name));
2756 error_with_decl (TREE_VALUE (dup),
2757 "this is a previous declaration");
2758 /* Just use the previous declaration. */
2759 return lookup_label (name);
2762 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2763 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2766 return lookup_label (name);
2769 /* Define a label, specifying the location in the source file.
2770 Return the LABEL_DECL node for the label, if the definition is valid.
2771 Otherwise return 0. */
2774 define_label (filename, line, name)
2775 const char *filename;
2779 tree decl = lookup_label (name);
2781 /* If label with this name is known from an outer context, shadow it. */
2782 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2784 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2785 IDENTIFIER_LABEL_VALUE (name) = 0;
2786 decl = lookup_label (name);
2789 if (warn_traditional && !in_system_header && lookup_name (name))
2790 warning_with_file_and_line (filename, line,
2791 "traditional C lacks a separate namespace for labels, identifier `%s' conflicts",
2792 IDENTIFIER_POINTER (name));
2794 if (DECL_INITIAL (decl) != 0)
2796 error_with_file_and_line (filename, line, "duplicate label `%s'",
2797 IDENTIFIER_POINTER (name));
2802 /* Mark label as having been defined. */
2803 DECL_INITIAL (decl) = error_mark_node;
2804 /* Say where in the source. */
2805 DECL_SOURCE_FILE (decl) = filename;
2806 DECL_SOURCE_LINE (decl) = line;
2811 /* Return the list of declarations of the current level.
2812 Note that this list is in reverse order unless/until
2813 you nreverse it; and when you do nreverse it, you must
2814 store the result back using `storedecls' or you will lose. */
2819 return current_binding_level->names;
2822 /* Return the list of type-tags (for structs, etc) of the current level. */
2827 return current_binding_level->tags;
2830 /* Store the list of declarations of the current level.
2831 This is done for the parameter declarations of a function being defined,
2832 after they are modified in the light of any missing parameters. */
2838 current_binding_level->names = decls;
2841 /* Similarly, store the list of tags of the current level. */
2847 current_binding_level->tags = tags;
2850 /* Given NAME, an IDENTIFIER_NODE,
2851 return the structure (or union or enum) definition for that name.
2852 Searches binding levels from BINDING_LEVEL up to the global level.
2853 If THISLEVEL_ONLY is nonzero, searches only the specified context
2854 (but skips any tag-transparent contexts to find one that is
2855 meaningful for tags).
2856 CODE says which kind of type the caller wants;
2857 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2858 If the wrong kind of type is found, an error is reported. */
2861 lookup_tag (code, name, binding_level, thislevel_only)
2862 enum tree_code code;
2863 struct binding_level *binding_level;
2867 register struct binding_level *level;
2869 for (level = binding_level; level; level = level->level_chain)
2872 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2874 if (TREE_PURPOSE (tail) == name)
2876 if (TREE_CODE (TREE_VALUE (tail)) != code)
2878 /* Definition isn't the kind we were looking for. */
2879 pending_invalid_xref = name;
2880 pending_invalid_xref_file = input_filename;
2881 pending_invalid_xref_line = lineno;
2883 return TREE_VALUE (tail);
2886 if (thislevel_only && ! level->tag_transparent)
2892 /* Print an error message now
2893 for a recent invalid struct, union or enum cross reference.
2894 We don't print them immediately because they are not invalid
2895 when used in the `struct foo;' construct for shadowing. */
2898 pending_xref_error ()
2900 if (pending_invalid_xref != 0)
2901 error_with_file_and_line (pending_invalid_xref_file,
2902 pending_invalid_xref_line,
2903 "`%s' defined as wrong kind of tag",
2904 IDENTIFIER_POINTER (pending_invalid_xref));
2905 pending_invalid_xref = 0;
2908 /* Given a type, find the tag that was defined for it and return the tag name.
2909 Otherwise return 0. */
2912 lookup_tag_reverse (type)
2915 register struct binding_level *level;
2917 for (level = current_binding_level; level; level = level->level_chain)
2920 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2922 if (TREE_VALUE (tail) == type)
2923 return TREE_PURPOSE (tail);
2929 /* Look up NAME in the current binding level and its superiors
2930 in the namespace of variables, functions and typedefs.
2931 Return a ..._DECL node of some kind representing its definition,
2932 or return 0 if it is undefined. */
2940 if (current_binding_level != global_binding_level
2941 && IDENTIFIER_LOCAL_VALUE (name))
2942 val = IDENTIFIER_LOCAL_VALUE (name);
2944 val = IDENTIFIER_GLOBAL_VALUE (name);
2948 /* Similar to `lookup_name' but look only at current binding level. */
2951 lookup_name_current_level (name)
2956 if (current_binding_level == global_binding_level)
2957 return IDENTIFIER_GLOBAL_VALUE (name);
2959 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2962 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2963 if (DECL_NAME (t) == name)
2969 /* Mark ARG for GC. */
2972 mark_binding_level (arg)
2975 struct binding_level *level = *(struct binding_level **) arg;
2977 for (; level != 0; level = level->level_chain)
2979 ggc_mark_tree (level->names);
2980 ggc_mark_tree (level->tags);
2981 ggc_mark_tree (level->shadowed);
2982 ggc_mark_tree (level->blocks);
2983 ggc_mark_tree (level->this_block);
2984 ggc_mark_tree (level->parm_order);
2988 /* Create the predefined scalar types of C,
2989 and some nodes representing standard constants (0, 1, (void *) 0).
2990 Initialize the global binding level.
2991 Make definitions for built-in primitive functions. */
2994 init_decl_processing ()
2996 register tree endlink;
2997 tree ptr_ftype_void, ptr_ftype_ptr;
2998 int wchar_type_size;
2999 tree array_domain_type;
3002 current_function_decl = NULL;
3003 named_labels = NULL;
3004 current_binding_level = NULL_BINDING_LEVEL;
3005 free_binding_level = NULL_BINDING_LEVEL;
3007 /* Make the binding_level structure for global names. */
3009 global_binding_level = current_binding_level;
3011 build_common_tree_nodes (flag_signed_char);
3013 /* Define `int' and `char' first so that dbx will output them first. */
3014 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_INT],
3015 integer_type_node));
3016 pushdecl (build_decl (TYPE_DECL, get_identifier ("char"),
3018 pushdecl (build_decl (TYPE_DECL, get_identifier ("long int"),
3019 long_integer_type_node));
3020 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned int"),
3021 unsigned_type_node));
3022 pushdecl (build_decl (TYPE_DECL, get_identifier ("long unsigned int"),
3023 long_unsigned_type_node));
3024 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long int"),
3025 long_long_integer_type_node));
3026 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long unsigned int"),
3027 long_long_unsigned_type_node));
3028 pushdecl (build_decl (TYPE_DECL, get_identifier ("short int"),
3029 short_integer_type_node));
3030 pushdecl (build_decl (TYPE_DECL, get_identifier ("short unsigned int"),
3031 short_unsigned_type_node));
3032 pushdecl (build_decl (TYPE_DECL, get_identifier ("signed char"),
3033 signed_char_type_node));
3034 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned char"),
3035 unsigned_char_type_node));
3036 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intQI_type_node));
3037 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intHI_type_node));
3038 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intSI_type_node));
3039 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
3040 #if HOST_BITS_PER_WIDE_INT >= 64
3041 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intTI_type_node));
3043 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node));
3044 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intHI_type_node));
3045 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intSI_type_node));
3046 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node));
3047 #if HOST_BITS_PER_WIDE_INT >= 64
3048 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intTI_type_node));
3051 /* `unsigned long' is the standard type for sizeof.
3052 Traditionally, use a signed type.
3053 Note that stddef.h uses `unsigned long',
3054 and this must agree, even if long and int are the same size. */
3055 t = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE)));
3056 signed_size_type_node = signed_type (t);
3057 if (flag_traditional && TREE_UNSIGNED (t))
3058 t = signed_type (t);
3060 c_size_type_node = t;
3063 /* Create the widest literal types. */
3064 widest_integer_literal_type_node
3065 = make_signed_type (HOST_BITS_PER_WIDE_INT * 2);
3066 widest_unsigned_literal_type_node
3067 = make_unsigned_type (HOST_BITS_PER_WIDE_INT * 2);
3068 pushdecl (build_decl (TYPE_DECL, NULL_TREE,
3069 widest_integer_literal_type_node));
3070 pushdecl (build_decl (TYPE_DECL, NULL_TREE,
3071 widest_unsigned_literal_type_node));
3073 build_common_tree_nodes_2 (flag_short_double);
3075 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_FLOAT],
3077 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_DOUBLE],
3079 pushdecl (build_decl (TYPE_DECL, get_identifier ("long double"),
3080 long_double_type_node));
3081 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex int"),
3082 complex_integer_type_node));
3083 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex float"),
3084 complex_float_type_node));
3085 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex double"),
3086 complex_double_type_node));
3087 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex long double"),
3088 complex_long_double_type_node));
3089 pushdecl (build_decl (TYPE_DECL,
3090 ridpointers[(int) RID_VOID], void_type_node));
3092 #ifdef MD_INIT_BUILTINS
3096 wchar_type_node = get_identifier (flag_short_wchar
3097 ? "short unsigned int"
3099 wchar_type_node = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (wchar_type_node));
3100 wchar_type_size = TYPE_PRECISION (wchar_type_node);
3101 signed_wchar_type_node = signed_type (wchar_type_node);
3102 unsigned_wchar_type_node = unsigned_type (wchar_type_node);
3105 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (WINT_TYPE)));
3108 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (INTMAX_TYPE)));
3110 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (UINTMAX_TYPE)));
3112 boolean_type_node = integer_type_node;
3113 boolean_true_node = integer_one_node;
3114 boolean_false_node = integer_zero_node;
3116 /* With GCC, C99's _Bool is always of size 1. */
3117 c_bool_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
3118 TREE_SET_CODE (c_bool_type_node, BOOLEAN_TYPE);
3119 TYPE_MAX_VALUE (c_bool_type_node) = build_int_2 (1, 0);
3120 TREE_TYPE (TYPE_MAX_VALUE (c_bool_type_node)) = c_bool_type_node;
3121 TYPE_PRECISION (c_bool_type_node) = 1;
3122 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
3124 c_bool_false_node = build_int_2 (0, 0);
3125 TREE_TYPE (c_bool_false_node) = c_bool_type_node;
3126 c_bool_true_node = build_int_2 (1, 0);
3127 TREE_TYPE (c_bool_true_node) = c_bool_type_node;
3129 string_type_node = build_pointer_type (char_type_node);
3130 const_string_type_node
3131 = build_pointer_type (build_type_variant (char_type_node, 1, 0));
3133 /* Make a type to be the domain of a few array types
3134 whose domains don't really matter.
3135 200 is small enough that it always fits in size_t
3136 and large enough that it can hold most function names for the
3137 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
3138 array_domain_type = build_index_type (build_int_2 (200, 0));
3140 /* make a type for arrays of characters.
3141 With luck nothing will ever really depend on the length of this
3143 char_array_type_node = build_array_type (char_type_node, array_domain_type);
3145 /* Likewise for arrays of ints. */
3147 = build_array_type (integer_type_node, array_domain_type);
3149 /* This is for wide string constants. */
3150 wchar_array_type_node
3151 = build_array_type (wchar_type_node, array_domain_type);
3153 void_list_node = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
3155 default_function_type = build_function_type (integer_type_node, NULL_TREE);
3157 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE)));
3158 unsigned_ptrdiff_type_node = unsigned_type (ptrdiff_type_node);
3160 c_common_nodes_and_builtins ();
3162 endlink = void_list_node;
3163 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
3165 = build_function_type (ptr_type_node,
3166 tree_cons (NULL_TREE, ptr_type_node, endlink));
3168 /* Types which are common to the fortran compiler and libf2c. When
3169 changing these, you also need to be concerned with f/com.h. */
3171 if (TYPE_PRECISION (float_type_node)
3172 == TYPE_PRECISION (long_integer_type_node))
3174 g77_integer_type_node = long_integer_type_node;
3175 g77_uinteger_type_node = long_unsigned_type_node;
3177 else if (TYPE_PRECISION (float_type_node)
3178 == TYPE_PRECISION (integer_type_node))
3180 g77_integer_type_node = integer_type_node;
3181 g77_uinteger_type_node = unsigned_type_node;
3184 g77_integer_type_node = g77_uinteger_type_node = NULL_TREE;
3186 if (g77_integer_type_node != NULL_TREE)
3188 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_integer"),
3189 g77_integer_type_node));
3190 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_uinteger"),
3191 g77_uinteger_type_node));
3194 if (TYPE_PRECISION (float_type_node) * 2
3195 == TYPE_PRECISION (long_integer_type_node))
3197 g77_longint_type_node = long_integer_type_node;
3198 g77_ulongint_type_node = long_unsigned_type_node;
3200 else if (TYPE_PRECISION (float_type_node) * 2
3201 == TYPE_PRECISION (long_long_integer_type_node))
3203 g77_longint_type_node = long_long_integer_type_node;
3204 g77_ulongint_type_node = long_long_unsigned_type_node;
3207 g77_longint_type_node = g77_ulongint_type_node = NULL_TREE;
3209 if (g77_longint_type_node != NULL_TREE)
3211 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_longint"),
3212 g77_longint_type_node));
3213 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_ulongint"),
3214 g77_ulongint_type_node));
3217 builtin_function ("__builtin_aggregate_incoming_address",
3218 build_function_type (ptr_type_node, NULL_TREE),
3219 BUILT_IN_AGGREGATE_INCOMING_ADDRESS,
3220 BUILT_IN_NORMAL, NULL_PTR);
3222 /* Hooks for the DWARF 2 __throw routine. */
3223 builtin_function ("__builtin_unwind_init",
3224 build_function_type (void_type_node, endlink),
3225 BUILT_IN_UNWIND_INIT, BUILT_IN_NORMAL, NULL_PTR);
3226 builtin_function ("__builtin_dwarf_cfa", ptr_ftype_void,
3227 BUILT_IN_DWARF_CFA, BUILT_IN_NORMAL, NULL_PTR);
3228 builtin_function ("__builtin_dwarf_fp_regnum",
3229 build_function_type (unsigned_type_node, endlink),
3230 BUILT_IN_DWARF_FP_REGNUM, BUILT_IN_NORMAL, NULL_PTR);
3231 builtin_function ("__builtin_init_dwarf_reg_size_table", void_ftype_ptr,
3232 BUILT_IN_INIT_DWARF_REG_SIZES, BUILT_IN_NORMAL, NULL_PTR);
3233 builtin_function ("__builtin_frob_return_addr", ptr_ftype_ptr,
3234 BUILT_IN_FROB_RETURN_ADDR, BUILT_IN_NORMAL, NULL_PTR);
3235 builtin_function ("__builtin_extract_return_addr", ptr_ftype_ptr,
3236 BUILT_IN_EXTRACT_RETURN_ADDR, BUILT_IN_NORMAL, NULL_PTR);
3238 ("__builtin_eh_return",
3239 build_function_type (void_type_node,
3240 tree_cons (NULL_TREE, ptr_type_node,
3241 tree_cons (NULL_TREE,
3242 type_for_mode (ptr_mode, 0),
3243 tree_cons (NULL_TREE,
3246 BUILT_IN_EH_RETURN, BUILT_IN_NORMAL, NULL_PTR);
3248 pedantic_lvalues = pedantic;
3250 /* Create the global bindings for __FUNCTION__, __PRETTY_FUNCTION__,
3252 function_id_node = get_identifier ("__FUNCTION__");
3253 pretty_function_id_node = get_identifier ("__PRETTY_FUNCTION__");
3254 func_id_node = get_identifier ("__func__");
3255 make_fname_decl = c_make_fname_decl;
3256 declare_function_name ();
3258 start_identifier_warnings ();
3260 /* Prepare to check format strings against argument lists. */
3261 init_function_format_info ();
3263 incomplete_decl_finalize_hook = finish_incomplete_decl;
3265 /* Record our roots. */
3267 ggc_add_tree_root (c_global_trees, CTI_MAX);
3268 ggc_add_root (&c_stmt_tree, 1, sizeof c_stmt_tree, mark_stmt_tree);
3269 ggc_add_tree_root (&c_scope_stmt_stack, 1);
3270 ggc_add_tree_root (&named_labels, 1);
3271 ggc_add_tree_root (&shadowed_labels, 1);
3272 ggc_add_root (¤t_binding_level, 1, sizeof current_binding_level,
3273 mark_binding_level);
3274 ggc_add_root (&label_level_chain, 1, sizeof label_level_chain,
3275 mark_binding_level);
3276 ggc_add_tree_root (&static_ctors, 1);
3277 ggc_add_tree_root (&static_dtors, 1);
3280 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3281 decl, NAME is the initialization string and TYPE_DEP indicates whether
3282 NAME depended on the type of the function. As we don't yet implement
3283 delayed emission of static data, we mark the decl as emitted
3284 so it is not placed in the output. Anything using it must therefore pull
3285 out the STRING_CST initializer directly. This does mean that these names
3286 are string merging candidates, which is wrong for C99's __func__. FIXME. */
3289 c_make_fname_decl (id, name, type_dep)
3292 int type_dep ATTRIBUTE_UNUSED;
3294 tree decl, type, init;
3295 size_t length = strlen (name);
3297 type = build_array_type
3298 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
3299 build_index_type (build_int_2 (length, 0)));
3301 decl = build_decl (VAR_DECL, id, type);
3302 TREE_STATIC (decl) = 1;
3303 TREE_READONLY (decl) = 1;
3304 TREE_ASM_WRITTEN (decl) = 1;
3305 DECL_SOURCE_LINE (decl) = 0;
3306 DECL_ARTIFICIAL (decl) = 1;
3307 DECL_IN_SYSTEM_HEADER (decl) = 1;
3308 DECL_IGNORED_P (decl) = 1;
3309 init = build_string (length + 1, name);
3310 TREE_TYPE (init) = type;
3311 DECL_INITIAL (decl) = init;
3312 finish_decl (pushdecl (decl), init, NULL_TREE);
3317 /* Return a definition for a builtin function named NAME and whose data type
3318 is TYPE. TYPE should be a function type with argument types.
3319 FUNCTION_CODE tells later passes how to compile calls to this function.
3320 See tree.h for its possible values.
3322 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3323 the name to be called if we can't opencode the function. */
3326 builtin_function (name, type, function_code, class, library_name)
3330 enum built_in_class class;
3331 const char *library_name;
3333 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3334 DECL_EXTERNAL (decl) = 1;
3335 TREE_PUBLIC (decl) = 1;
3336 /* If -traditional, permit redefining a builtin function any way you like.
3337 (Though really, if the program redefines these functions,
3338 it probably won't work right unless compiled with -fno-builtin.) */
3339 if (flag_traditional && name[0] != '_')
3340 DECL_BUILT_IN_NONANSI (decl) = 1;
3342 DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
3343 make_decl_rtl (decl, NULL_PTR, 1);
3345 DECL_BUILT_IN_CLASS (decl) = class;
3346 DECL_FUNCTION_CODE (decl) = function_code;
3348 /* Warn if a function in the namespace for users
3349 is used without an occasion to consider it declared. */
3350 if (name[0] != '_' || name[1] != '_')
3351 C_DECL_ANTICIPATED (decl) = 1;
3356 /* Called when a declaration is seen that contains no names to declare.
3357 If its type is a reference to a structure, union or enum inherited
3358 from a containing scope, shadow that tag name for the current scope
3359 with a forward reference.
3360 If its type defines a new named structure or union
3361 or defines an enum, it is valid but we need not do anything here.
3362 Otherwise, it is an error. */
3365 shadow_tag (declspecs)
3368 shadow_tag_warned (declspecs, 0);
3372 shadow_tag_warned (declspecs, warned)
3375 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3382 pending_invalid_xref = 0;
3384 /* Remove the attributes from declspecs, since they will confuse the
3386 split_specs_attrs (declspecs, &specs, &attrs);
3388 for (link = specs; link; link = TREE_CHAIN (link))
3390 register tree value = TREE_VALUE (link);
3391 register enum tree_code code = TREE_CODE (value);
3393 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3394 /* Used to test also that TYPE_SIZE (value) != 0.
3395 That caused warning for `struct foo;' at top level in the file. */
3397 register tree name = lookup_tag_reverse (value);
3404 if (warned != 1 && code != ENUMERAL_TYPE)
3405 /* Empty unnamed enum OK */
3407 pedwarn ("unnamed struct/union that defines no instances");
3413 t = lookup_tag (code, name, current_binding_level, 1);
3417 t = make_node (code);
3424 if (!warned && ! in_system_header)
3426 warning ("useless keyword or type name in empty declaration");
3433 error ("two types specified in one empty declaration");
3438 pedwarn ("empty declaration");
3442 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3445 groktypename (typename)
3448 if (TREE_CODE (typename) != TREE_LIST)
3450 return grokdeclarator (TREE_VALUE (typename),
3451 TREE_PURPOSE (typename),
3455 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3458 groktypename_in_parm_context (typename)
3461 if (TREE_CODE (typename) != TREE_LIST)
3463 return grokdeclarator (TREE_VALUE (typename),
3464 TREE_PURPOSE (typename),
3468 /* Decode a declarator in an ordinary declaration or data definition.
3469 This is called as soon as the type information and variable name
3470 have been parsed, before parsing the initializer if any.
3471 Here we create the ..._DECL node, fill in its type,
3472 and put it on the list of decls for the current context.
3473 The ..._DECL node is returned as the value.
3475 Exception: for arrays where the length is not specified,
3476 the type is left null, to be filled in by `finish_decl'.
3478 Function definitions do not come here; they go to start_function
3479 instead. However, external and forward declarations of functions
3480 do go through here. Structure field declarations are done by
3481 grokfield and not through here. */
3484 start_decl (declarator, declspecs, initialized, attributes, prefix_attributes)
3485 tree declarator, declspecs;
3487 tree attributes, prefix_attributes;
3489 register tree decl = grokdeclarator (declarator, declspecs,
3490 NORMAL, initialized);
3493 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3494 && MAIN_NAME_P (DECL_NAME (decl)))
3495 warning_with_decl (decl, "`%s' is usually a function");
3498 /* Is it valid for this decl to have an initializer at all?
3499 If not, set INITIALIZED to zero, which will indirectly
3500 tell `finish_decl' to ignore the initializer once it is parsed. */
3501 switch (TREE_CODE (decl))
3504 /* typedef foo = bar means give foo the same type as bar.
3505 We haven't parsed bar yet, so `finish_decl' will fix that up.
3506 Any other case of an initialization in a TYPE_DECL is an error. */
3507 if (pedantic || list_length (declspecs) > 1)
3509 error ("typedef `%s' is initialized",
3510 IDENTIFIER_POINTER (DECL_NAME (decl)));
3516 error ("function `%s' is initialized like a variable",
3517 IDENTIFIER_POINTER (DECL_NAME (decl)));
3522 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3523 error ("parameter `%s' is initialized",
3524 IDENTIFIER_POINTER (DECL_NAME (decl)));
3529 /* Don't allow initializations for incomplete types
3530 except for arrays which might be completed by the initialization. */
3532 /* This can happen if the array size is an undefined macro. We already
3533 gave a warning, so we don't need another one. */
3534 if (TREE_TYPE (decl) == error_mark_node)
3536 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3538 /* A complete type is ok if size is fixed. */
3540 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3541 || C_DECL_VARIABLE_SIZE (decl))
3543 error ("variable-sized object may not be initialized");
3547 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3549 error ("variable `%s' has initializer but incomplete type",
3550 IDENTIFIER_POINTER (DECL_NAME (decl)));
3553 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
3555 error ("elements of array `%s' have incomplete type",
3556 IDENTIFIER_POINTER (DECL_NAME (decl)));
3564 /* Seems redundant with grokdeclarator. */
3565 if (current_binding_level != global_binding_level
3566 && DECL_EXTERNAL (decl)
3567 && TREE_CODE (decl) != FUNCTION_DECL)
3568 warning ("declaration of `%s' has `extern' and is initialized",
3569 IDENTIFIER_POINTER (DECL_NAME (decl)));
3571 DECL_EXTERNAL (decl) = 0;
3572 if (current_binding_level == global_binding_level)
3573 TREE_STATIC (decl) = 1;
3575 /* Tell `pushdecl' this is an initialized decl
3576 even though we don't yet have the initializer expression.
3577 Also tell `finish_decl' it may store the real initializer. */
3578 DECL_INITIAL (decl) = error_mark_node;
3581 /* If this is a function declaration, write a record describing it to the
3582 prototypes file (if requested). */
3584 if (TREE_CODE (decl) == FUNCTION_DECL)
3585 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3587 /* ANSI specifies that a tentative definition which is not merged with
3588 a non-tentative definition behaves exactly like a definition with an
3589 initializer equal to zero. (Section 3.7.2)
3590 -fno-common gives strict ANSI behavior. Usually you don't want it.
3591 This matters only for variables with external linkage. */
3592 if (! flag_no_common || ! TREE_PUBLIC (decl))
3593 DECL_COMMON (decl) = 1;
3595 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
3596 SET_DEFAULT_DECL_ATTRIBUTES (decl, attributes);
3599 /* Set attributes here so if duplicate decl, will have proper attributes. */
3600 decl_attributes (decl, attributes, prefix_attributes);
3602 /* Add this decl to the current binding level.
3603 TEM may equal DECL or it may be a previous decl of the same name. */
3604 tem = pushdecl (decl);
3606 /* For a local variable, define the RTL now. */
3607 if (current_binding_level != global_binding_level
3608 /* But not if this is a duplicate decl
3609 and we preserved the rtl from the previous one
3610 (which may or may not happen). */
3611 && DECL_RTL (tem) == 0
3612 && !DECL_CONTEXT (tem))
3614 if (TREE_TYPE (tem) != error_mark_node
3615 && COMPLETE_TYPE_P (TREE_TYPE (tem)))
3617 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3618 && DECL_INITIAL (tem) != 0)
3625 /* Finish processing of a declaration;
3626 install its initial value.
3627 If the length of an array type is not known before,
3628 it must be determined now, from the initial value, or it is an error. */
3631 finish_decl (decl, init, asmspec_tree)
3635 register tree type = TREE_TYPE (decl);
3636 int was_incomplete = (DECL_SIZE (decl) == 0);
3637 const char *asmspec = 0;
3639 /* If a name was specified, get the string. */
3641 asmspec = TREE_STRING_POINTER (asmspec_tree);
3643 /* If `start_decl' didn't like having an initialization, ignore it now. */
3645 if (init != 0 && DECL_INITIAL (decl) == 0)
3647 /* Don't crash if parm is initialized. */
3648 if (TREE_CODE (decl) == PARM_DECL)
3653 if (TREE_CODE (decl) != TYPE_DECL)
3654 store_init_value (decl, init);
3657 /* typedef foo = bar; store the type of bar as the type of foo. */
3658 TREE_TYPE (decl) = TREE_TYPE (init);
3659 DECL_INITIAL (decl) = init = 0;
3663 /* Deduce size of array from initialization, if not already known */
3665 if (TREE_CODE (type) == ARRAY_TYPE
3666 && TYPE_DOMAIN (type) == 0
3667 && TREE_CODE (decl) != TYPE_DECL)
3670 = (TREE_STATIC (decl)
3671 /* Even if pedantic, an external linkage array
3672 may have incomplete type at first. */
3673 ? pedantic && !TREE_PUBLIC (decl)
3674 : !DECL_EXTERNAL (decl));
3676 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3678 /* Get the completed type made by complete_array_type. */
3679 type = TREE_TYPE (decl);
3682 error_with_decl (decl, "initializer fails to determine size of `%s'");
3684 else if (failure == 2)
3687 error_with_decl (decl, "array size missing in `%s'");
3688 /* If a `static' var's size isn't known,
3689 make it extern as well as static, so it does not get
3691 If it is not `static', then do not mark extern;
3692 finish_incomplete_decl will give it a default size
3693 and it will get allocated. */
3694 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3695 DECL_EXTERNAL (decl) = 1;
3698 /* TYPE_MAX_VALUE is always one less than the number of elements
3699 in the array, because we start counting at zero. Therefore,
3700 warn only if the value is less than zero. */
3701 else if (pedantic && TYPE_DOMAIN (type) != 0
3702 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3703 error_with_decl (decl, "zero or negative size array `%s'");
3705 layout_decl (decl, 0);
3708 if (TREE_CODE (decl) == VAR_DECL)
3710 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
3711 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3712 layout_decl (decl, 0);
3714 if (DECL_SIZE (decl) == 0
3715 /* Don't give an error if we already gave one earlier. */
3716 && TREE_TYPE (decl) != error_mark_node
3717 && (TREE_STATIC (decl)
3719 /* A static variable with an incomplete type
3720 is an error if it is initialized.
3721 Also if it is not file scope.
3722 Otherwise, let it through, but if it is not `extern'
3723 then it may cause an error message later. */
3724 (DECL_INITIAL (decl) != 0
3725 || DECL_CONTEXT (decl) != 0)
3727 /* An automatic variable with an incomplete type
3729 !DECL_EXTERNAL (decl)))
3731 error_with_decl (decl, "storage size of `%s' isn't known");
3732 TREE_TYPE (decl) = error_mark_node;
3735 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3736 && DECL_SIZE (decl) != 0)
3738 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3739 constant_expression_warning (DECL_SIZE (decl));
3741 error_with_decl (decl, "storage size of `%s' isn't constant");
3744 if (TREE_USED (type))
3745 TREE_USED (decl) = 1;
3748 /* If this is a function and an assembler name is specified, it isn't
3749 builtin any more. Also reset DECL_RTL so we can give it its new
3751 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3753 DECL_BUILT_IN_CLASS (decl) = NOT_BUILT_IN;
3754 DECL_RTL (decl) = 0;
3755 DECL_ASSEMBLER_NAME (decl) = get_identifier (asmspec);
3758 /* Output the assembler code and/or RTL code for variables and functions,
3759 unless the type is an undefined structure or union.
3760 If not, it will get done when the type is completed. */
3762 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3764 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3765 maybe_objc_check_decl (decl);
3767 if (!DECL_CONTEXT (decl))
3768 rest_of_decl_compilation (decl, asmspec,
3769 (DECL_CONTEXT (decl) == 0
3770 || TREE_ASM_WRITTEN (decl)), 0);
3774 DECL_ASSEMBLER_NAME (decl) = get_identifier (asmspec);
3775 add_decl_stmt (decl);
3778 if (DECL_CONTEXT (decl) != 0)
3780 /* Recompute the RTL of a local array now
3781 if it used to be an incomplete type. */
3783 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3785 /* If we used it already as memory, it must stay in memory. */
3786 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3787 /* If it's still incomplete now, no init will save it. */
3788 if (DECL_SIZE (decl) == 0)
3789 DECL_INITIAL (decl) = 0;
3794 if (TREE_CODE (decl) == TYPE_DECL)
3796 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3797 maybe_objc_check_decl (decl);
3798 rest_of_decl_compilation (decl, NULL_PTR, DECL_CONTEXT (decl) == 0, 0);
3801 /* At the end of a declaration, throw away any variable type sizes
3802 of types defined inside that declaration. There is no use
3803 computing them in the following function definition. */
3804 if (current_binding_level == global_binding_level)
3805 get_pending_sizes ();
3808 /* If DECL has a cleanup, build and return that cleanup here.
3809 This is a callback called by expand_expr. */
3812 maybe_build_cleanup (decl)
3813 tree decl ATTRIBUTE_UNUSED;
3815 /* There are no cleanups in C. */
3819 /* Given a parsed parameter declaration,
3820 decode it into a PARM_DECL and push that on the current binding level.
3821 Also, for the sake of forward parm decls,
3822 record the given order of parms in `parm_order'. */
3825 push_parm_decl (parm)
3829 int old_immediate_size_expand = immediate_size_expand;
3830 /* Don't try computing parm sizes now -- wait till fn is called. */
3831 immediate_size_expand = 0;
3833 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3834 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3835 decl_attributes (decl, TREE_VALUE (TREE_VALUE (parm)),
3836 TREE_PURPOSE (TREE_VALUE (parm)));
3839 if (DECL_NAME (decl))
3842 olddecl = lookup_name (DECL_NAME (decl));
3843 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3844 pedwarn_with_decl (decl,
3845 "ANSI C forbids parameter `%s' shadowing typedef");
3849 decl = pushdecl (decl);
3851 immediate_size_expand = old_immediate_size_expand;
3853 current_binding_level->parm_order
3854 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3856 /* Add this decl to the current binding level. */
3857 finish_decl (decl, NULL_TREE, NULL_TREE);
3860 /* Clear the given order of parms in `parm_order'.
3861 Used at start of parm list,
3862 and also at semicolon terminating forward decls. */
3867 current_binding_level->parm_order = NULL_TREE;
3870 /* Make TYPE a complete type based on INITIAL_VALUE.
3871 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3872 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3875 complete_array_type (type, initial_value, do_default)
3880 register tree maxindex = NULL_TREE;
3885 /* Note MAXINDEX is really the maximum index,
3886 one less than the size. */
3887 if (TREE_CODE (initial_value) == STRING_CST)
3890 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3891 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3894 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3896 tree elts = CONSTRUCTOR_ELTS (initial_value);
3897 maxindex = build_int_2 (-1, -1);
3898 for (; elts; elts = TREE_CHAIN (elts))
3900 if (TREE_PURPOSE (elts))
3901 maxindex = TREE_PURPOSE (elts);
3903 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3904 maxindex, integer_one_node));
3906 maxindex = copy_node (maxindex);
3910 /* Make an error message unless that happened already. */
3911 if (initial_value != error_mark_node)
3914 /* Prevent further error messages. */
3915 maxindex = build_int_2 (0, 0);
3922 maxindex = build_int_2 (0, 0);
3928 TYPE_DOMAIN (type) = build_index_type (maxindex);
3929 if (!TREE_TYPE (maxindex))
3930 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3933 /* Lay out the type now that we can get the real answer. */
3940 /* Given declspecs and a declarator,
3941 determine the name and type of the object declared
3942 and construct a ..._DECL node for it.
3943 (In one case we can return a ..._TYPE node instead.
3944 For invalid input we sometimes return 0.)
3946 DECLSPECS is a chain of tree_list nodes whose value fields
3947 are the storage classes and type specifiers.
3949 DECL_CONTEXT says which syntactic context this declaration is in:
3950 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3951 FUNCDEF for a function definition. Like NORMAL but a few different
3952 error messages in each case. Return value may be zero meaning
3953 this definition is too screwy to try to parse.
3954 PARM for a parameter declaration (either within a function prototype
3955 or before a function body). Make a PARM_DECL, or return void_type_node.
3956 TYPENAME if for a typename (in a cast or sizeof).
3957 Don't make a DECL node; just return the ..._TYPE node.
3958 FIELD for a struct or union field; make a FIELD_DECL.
3959 BITFIELD for a field with specified width.
3960 INITIALIZED is 1 if the decl has an initializer.
3962 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3963 It may also be so in the PARM case, for a prototype where the
3964 argument type is specified but not the name.
3966 This function is where the complicated C meanings of `static'
3967 and `extern' are interpreted. */
3970 grokdeclarator (declarator, declspecs, decl_context, initialized)
3973 enum decl_context decl_context;
3978 tree type = NULL_TREE;
3983 int type_quals = TYPE_UNQUALIFIED;
3985 int explicit_int = 0;
3986 int explicit_char = 0;
3987 int defaulted_int = 0;
3988 tree typedef_decl = 0;
3990 tree typedef_type = 0;
3991 int funcdef_flag = 0;
3992 enum tree_code innermost_code = ERROR_MARK;
3994 int size_varies = 0;
3995 tree decl_machine_attr = NULL_TREE;
3997 if (decl_context == BITFIELD)
3998 bitfield = 1, decl_context = FIELD;
4000 if (decl_context == FUNCDEF)
4001 funcdef_flag = 1, decl_context = NORMAL;
4003 /* Look inside a declarator for the name being declared
4004 and get it as a string, for an error message. */
4006 register tree decl = declarator;
4010 switch (TREE_CODE (decl))
4015 innermost_code = TREE_CODE (decl);
4016 decl = TREE_OPERAND (decl, 0);
4019 case IDENTIFIER_NODE:
4020 name = IDENTIFIER_POINTER (decl);
4031 /* A function definition's declarator must have the form of
4032 a function declarator. */
4034 if (funcdef_flag && innermost_code != CALL_EXPR)
4037 /* Anything declared one level down from the top level
4038 must be one of the parameters of a function
4039 (because the body is at least two levels down). */
4041 /* If this looks like a function definition, make it one,
4042 even if it occurs where parms are expected.
4043 Then store_parm_decls will reject it and not use it as a parm. */
4044 if (decl_context == NORMAL && !funcdef_flag
4045 && current_binding_level->parm_flag)
4046 decl_context = PARM;
4048 /* Look through the decl specs and record which ones appear.
4049 Some typespecs are defined as built-in typenames.
4050 Others, the ones that are modifiers of other types,
4051 are represented by bits in SPECBITS: set the bits for
4052 the modifiers that appear. Storage class keywords are also in SPECBITS.
4054 If there is a typedef name or a type, store the type in TYPE.
4055 This includes builtin typedefs such as `int'.
4057 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
4058 and did not come from a user typedef.
4060 Set LONGLONG if `long' is mentioned twice. */
4062 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
4064 register tree id = TREE_VALUE (spec);
4066 if (id == ridpointers[(int) RID_INT])
4068 if (id == ridpointers[(int) RID_CHAR])
4071 if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
4073 enum rid i = C_RID_CODE (id);
4074 if (i <= RID_LAST_MODIFIER)
4076 if (i == RID_LONG && specbits & (1<<i))
4079 error ("`long long long' is too long for GCC");
4082 if (pedantic && !flag_isoc99 && ! in_system_header
4084 pedwarn ("ISO C89 does not support `long long'");
4088 else if (specbits & (1 << i))
4089 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
4095 error ("two or more data types in declaration of `%s'", name);
4096 /* Actual typedefs come to us as TYPE_DECL nodes. */
4097 else if (TREE_CODE (id) == TYPE_DECL)
4099 type = TREE_TYPE (id);
4100 decl_machine_attr = DECL_MACHINE_ATTRIBUTES (id);
4103 /* Built-in types come as identifiers. */
4104 else if (TREE_CODE (id) == IDENTIFIER_NODE)
4106 register tree t = lookup_name (id);
4107 if (TREE_TYPE (t) == error_mark_node)
4109 else if (!t || TREE_CODE (t) != TYPE_DECL)
4110 error ("`%s' fails to be a typedef or built in type",
4111 IDENTIFIER_POINTER (id));
4114 type = TREE_TYPE (t);
4118 else if (TREE_CODE (id) != ERROR_MARK)
4125 typedef_type = type;
4127 size_varies = C_TYPE_VARIABLE_SIZE (type);
4129 /* No type at all: default to `int', and set DEFAULTED_INT
4130 because it was not a user-defined typedef. */
4134 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4135 | (1 << (int) RID_SIGNED)
4136 | (1 << (int) RID_UNSIGNED)
4137 | (1 << (int) RID_COMPLEX))))
4138 /* Don't warn about typedef foo = bar. */
4139 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
4140 && ! in_system_header)
4142 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
4143 and this is a function, or if -Wimplicit; prefer the former
4144 warning since it is more explicit. */
4145 if ((warn_implicit_int || warn_return_type) && funcdef_flag)
4146 warn_about_return_type = 1;
4147 else if (warn_implicit_int || flag_isoc99)
4148 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
4153 type = integer_type_node;
4156 /* Now process the modifiers that were specified
4157 and check for invalid combinations. */
4159 /* Long double is a special combination. */
4161 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4162 && TYPE_MAIN_VARIANT (type) == double_type_node)
4164 specbits &= ~(1 << (int) RID_LONG);
4165 type = long_double_type_node;
4168 /* Check all other uses of type modifiers. */
4170 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4171 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4175 if ((specbits & 1 << (int) RID_LONG)
4176 && (specbits & 1 << (int) RID_SHORT))
4177 error ("both long and short specified for `%s'", name);
4178 else if (((specbits & 1 << (int) RID_LONG)
4179 || (specbits & 1 << (int) RID_SHORT))
4181 error ("long or short specified with char for `%s'", name);
4182 else if (((specbits & 1 << (int) RID_LONG)
4183 || (specbits & 1 << (int) RID_SHORT))
4184 && TREE_CODE (type) == REAL_TYPE)
4186 static int already = 0;
4188 error ("long or short specified with floating type for `%s'", name);
4189 if (! already && ! pedantic)
4191 error ("the only valid combination is `long double'");
4195 else if ((specbits & 1 << (int) RID_SIGNED)
4196 && (specbits & 1 << (int) RID_UNSIGNED))
4197 error ("both signed and unsigned specified for `%s'", name);
4198 else if (TREE_CODE (type) != INTEGER_TYPE)
4199 error ("long, short, signed or unsigned invalid for `%s'", name);
4203 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4205 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4207 if (flag_pedantic_errors)
4212 /* Discard the type modifiers if they are invalid. */
4215 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4216 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4221 if ((specbits & (1 << (int) RID_COMPLEX))
4222 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4224 error ("complex invalid for `%s'", name);
4225 specbits &= ~(1 << (int) RID_COMPLEX);
4228 /* Decide whether an integer type is signed or not.
4229 Optionally treat bitfields as signed by default. */
4230 if (specbits & 1 << (int) RID_UNSIGNED
4231 /* Traditionally, all bitfields are unsigned. */
4232 || (bitfield && flag_traditional
4233 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4234 || (bitfield && ! flag_signed_bitfields
4235 && (explicit_int || defaulted_int || explicit_char
4236 /* A typedef for plain `int' without `signed'
4237 can be controlled just like plain `int'. */
4238 || ! (typedef_decl != 0
4239 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4240 && TREE_CODE (type) != ENUMERAL_TYPE
4241 && !(specbits & 1 << (int) RID_SIGNED)))
4244 type = long_long_unsigned_type_node;
4245 else if (specbits & 1 << (int) RID_LONG)
4246 type = long_unsigned_type_node;
4247 else if (specbits & 1 << (int) RID_SHORT)
4248 type = short_unsigned_type_node;
4249 else if (type == char_type_node)
4250 type = unsigned_char_type_node;
4251 else if (typedef_decl)
4252 type = unsigned_type (type);
4254 type = unsigned_type_node;
4256 else if ((specbits & 1 << (int) RID_SIGNED)
4257 && type == char_type_node)
4258 type = signed_char_type_node;
4260 type = long_long_integer_type_node;
4261 else if (specbits & 1 << (int) RID_LONG)
4262 type = long_integer_type_node;
4263 else if (specbits & 1 << (int) RID_SHORT)
4264 type = short_integer_type_node;
4266 if (specbits & 1 << (int) RID_COMPLEX)
4268 if (pedantic && !flag_isoc99)
4269 pedwarn ("ISO C89 does not support complex types");
4270 /* If we just have "complex", it is equivalent to
4271 "complex double", but if any modifiers at all are specified it is
4272 the complex form of TYPE. E.g, "complex short" is
4273 "complex short int". */
4275 if (defaulted_int && ! longlong
4276 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4277 | (1 << (int) RID_SIGNED)
4278 | (1 << (int) RID_UNSIGNED))))
4281 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
4282 type = complex_double_type_node;
4284 else if (type == integer_type_node)
4287 pedwarn ("ISO C does not support complex integer types");
4288 type = complex_integer_type_node;
4290 else if (type == float_type_node)
4291 type = complex_float_type_node;
4292 else if (type == double_type_node)
4293 type = complex_double_type_node;
4294 else if (type == long_double_type_node)
4295 type = complex_long_double_type_node;
4299 pedwarn ("ISO C does not support complex integer types");
4300 type = build_complex_type (type);
4304 /* Figure out the type qualifiers for the declaration. There are
4305 two ways a declaration can become qualified. One is something
4306 like `const int i' where the `const' is explicit. Another is
4307 something like `typedef const int CI; CI i' where the type of the
4308 declaration contains the `const'. */
4309 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4310 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
4311 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4312 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4313 if (constp > 1 && ! flag_isoc99)
4314 pedwarn ("duplicate `const'");
4315 if (restrictp > 1 && ! flag_isoc99)
4316 pedwarn ("duplicate `restrict'");
4317 if (volatilep > 1 && ! flag_isoc99)
4318 pedwarn ("duplicate `volatile'");
4319 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
4320 type = TYPE_MAIN_VARIANT (type);
4321 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4322 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4323 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4325 /* Warn if two storage classes are given. Default to `auto'. */
4330 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4331 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4332 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4333 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4334 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4336 /* Warn about storage classes that are invalid for certain
4337 kinds of declarations (parameters, typenames, etc.). */
4340 error ("multiple storage classes in declaration of `%s'", name);
4341 else if (funcdef_flag
4343 & ((1 << (int) RID_REGISTER)
4344 | (1 << (int) RID_AUTO)
4345 | (1 << (int) RID_TYPEDEF))))
4347 if (specbits & 1 << (int) RID_AUTO
4348 && (pedantic || current_binding_level == global_binding_level))
4349 pedwarn ("function definition declared `auto'");
4350 if (specbits & 1 << (int) RID_REGISTER)
4351 error ("function definition declared `register'");
4352 if (specbits & 1 << (int) RID_TYPEDEF)
4353 error ("function definition declared `typedef'");
4354 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4355 | (1 << (int) RID_AUTO));
4357 else if (decl_context != NORMAL && nclasses > 0)
4359 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4363 switch (decl_context)
4366 error ("storage class specified for structure field `%s'",
4370 error ("storage class specified for parameter `%s'", name);
4373 error ("storage class specified for typename");
4376 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4377 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4378 | (1 << (int) RID_EXTERN));
4381 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4383 /* `extern' with initialization is invalid if not at top level. */
4384 if (current_binding_level == global_binding_level)
4385 warning ("`%s' initialized and declared `extern'", name);
4387 error ("`%s' has both `extern' and initializer", name);
4389 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4390 && current_binding_level != global_binding_level)
4391 error ("nested function `%s' declared `extern'", name);
4392 else if (current_binding_level == global_binding_level
4393 && specbits & (1 << (int) RID_AUTO))
4394 error ("top-level declaration of `%s' specifies `auto'", name);
4397 /* Now figure out the structure of the declarator proper.
4398 Descend through it, creating more complex types, until we reach
4399 the declared identifier (or NULL_TREE, in an absolute declarator). */
4401 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4403 if (type == error_mark_node)
4405 declarator = TREE_OPERAND (declarator, 0);
4409 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4410 an INDIRECT_REF (for *...),
4411 a CALL_EXPR (for ...(...)),
4412 an identifier (for the name being declared)
4413 or a null pointer (for the place in an absolute declarator
4414 where the name was omitted).
4415 For the last two cases, we have just exited the loop.
4417 At this point, TYPE is the type of elements of an array,
4418 or for a function to return, or for a pointer to point to.
4419 After this sequence of ifs, TYPE is the type of the
4420 array or function or pointer, and DECLARATOR has had its
4421 outermost layer removed. */
4423 if (TREE_CODE (declarator) == ARRAY_REF)
4425 register tree itype = NULL_TREE;
4426 register tree size = TREE_OPERAND (declarator, 1);
4427 /* The index is a signed object `sizetype' bits wide. */
4428 tree index_type = signed_type (sizetype);
4430 declarator = TREE_OPERAND (declarator, 0);
4432 /* Check for some types that there cannot be arrays of. */
4434 if (VOID_TYPE_P (type))
4436 error ("declaration of `%s' as array of voids", name);
4437 type = error_mark_node;
4440 if (TREE_CODE (type) == FUNCTION_TYPE)
4442 error ("declaration of `%s' as array of functions", name);
4443 type = error_mark_node;
4446 if (size == error_mark_node)
4447 type = error_mark_node;
4449 if (type == error_mark_node)
4452 /* If size was specified, set ITYPE to a range-type for that size.
4453 Otherwise, ITYPE remains null. finish_decl may figure it out
4454 from an initial value. */
4458 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4459 STRIP_TYPE_NOPS (size);
4461 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
4462 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
4464 error ("size of array `%s' has non-integer type", name);
4465 size = integer_one_node;
4468 if (pedantic && integer_zerop (size))
4469 pedwarn ("ISO C forbids zero-size array `%s'", name);
4471 if (TREE_CODE (size) == INTEGER_CST)
4473 constant_expression_warning (size);
4474 if (tree_int_cst_sgn (size) < 0)
4476 error ("size of array `%s' is negative", name);
4477 size = integer_one_node;
4482 /* Make sure the array size remains visibly nonconstant
4483 even if it is (eg) a const variable with known value. */
4488 if (TREE_CONSTANT (size))
4489 pedwarn ("ISO C89 forbids array `%s' whose size can't be evaluated",
4492 pedwarn ("ISO C89 forbids variable-size array `%s'",
4497 /* Convert size to index_type, so that if it is a variable
4498 the computations will be done in the proper mode. */
4499 itype = fold (build (MINUS_EXPR, index_type,
4500 convert (index_type, size),
4501 convert (index_type, size_one_node)));
4503 /* If that overflowed, the array is too big.
4504 ??? While a size of INT_MAX+1 technically shouldn't cause
4505 an overflow (because we subtract 1), the overflow is recorded
4506 during the conversion to index_type, before the subtraction.
4507 Handling this case seems like an unnecessary complication. */
4508 if (TREE_OVERFLOW (itype))
4510 error ("size of array `%s' is too large", name);
4511 type = error_mark_node;
4516 itype = variable_size (itype);
4517 itype = build_index_type (itype);
4521 /* This had bad results for pointers to arrays, as in
4522 union incomplete (*foo)[4]; */
4523 /* Complain about arrays of incomplete types, except in typedefs. */
4525 if (!COMPLETE_TYPE_P (type)
4526 /* Avoid multiple warnings for nested array types. */
4527 && TREE_CODE (type) != ARRAY_TYPE
4528 && !(specbits & (1 << (int) RID_TYPEDEF))
4529 && !C_TYPE_BEING_DEFINED (type))
4530 warning ("array type has incomplete element type");
4534 /* We shouldn't have a function type here at all!
4535 Functions aren't allowed as array elements. */
4536 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4537 && (constp || volatilep))
4538 pedwarn ("ANSI C forbids const or volatile function types");
4541 /* Build the array type itself, then merge any constancy or
4542 volatility into the target type. We must do it in this order
4543 to ensure that the TYPE_MAIN_VARIANT field of the array type
4544 is set correctly. */
4546 type = build_array_type (type, itype);
4548 type = c_build_qualified_type (type, type_quals);
4551 /* Don't clear these; leave them set so that the array type
4552 or the variable is itself const or volatile. */
4553 type_quals = TYPE_UNQUALIFIED;
4557 C_TYPE_VARIABLE_SIZE (type) = 1;
4559 else if (TREE_CODE (declarator) == CALL_EXPR)
4563 /* Declaring a function type.
4564 Make sure we have a valid type for the function to return. */
4565 if (type == error_mark_node)
4570 /* Warn about some types functions can't return. */
4572 if (TREE_CODE (type) == FUNCTION_TYPE)
4574 error ("`%s' declared as function returning a function", name);
4575 type = integer_type_node;
4577 if (TREE_CODE (type) == ARRAY_TYPE)
4579 error ("`%s' declared as function returning an array", name);
4580 type = integer_type_node;
4583 #ifndef TRADITIONAL_RETURN_FLOAT
4584 /* Traditionally, declaring return type float means double. */
4586 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4587 type = double_type_node;
4588 #endif /* TRADITIONAL_RETURN_FLOAT */
4590 /* Construct the function type and go to the next
4591 inner layer of declarator. */
4593 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4595 /* Say it's a definition
4596 only for the CALL_EXPR
4597 closest to the identifier. */
4598 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4599 /* Type qualifiers before the return type of the function
4600 qualify the return type, not the function type. */
4603 /* Type qualifiers on a function return type are normally
4604 permitted by the standard but have no effect, so give a
4605 warning at -W. Qualifiers on a void return type have
4606 meaning as a GNU extension, and are banned on function
4607 definitions in ISO C. FIXME: strictly we shouldn't
4608 pedwarn for qualified void return types except on function
4609 definitions, but not doing so could lead to the undesirable
4610 state of a "volatile void" function return type not being
4611 warned about, and a use of the function being compiled
4612 with GNU semantics, with no diagnostics under -pedantic. */
4613 if (VOID_TYPE_P (type) && pedantic && !in_system_header)
4614 pedwarn ("ISO C forbids qualified void function return type");
4615 else if (extra_warnings
4616 && !(VOID_TYPE_P (type)
4617 && type_quals == TYPE_QUAL_VOLATILE))
4618 warning ("type qualifiers ignored on function return type");
4620 type = c_build_qualified_type (type, type_quals);
4622 type_quals = TYPE_UNQUALIFIED;
4624 type = build_function_type (type, arg_types);
4625 declarator = TREE_OPERAND (declarator, 0);
4627 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4628 the formal parameter list of this FUNCTION_TYPE to point to
4629 the FUNCTION_TYPE node itself. */
4634 for (link = last_function_parm_tags;
4636 link = TREE_CHAIN (link))
4637 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4640 else if (TREE_CODE (declarator) == INDIRECT_REF)
4642 /* Merge any constancy or volatility into the target type
4645 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4647 pedwarn ("ISO C forbids qualified function types");
4649 type = c_build_qualified_type (type, type_quals);
4650 type_quals = TYPE_UNQUALIFIED;
4653 type = build_pointer_type (type);
4655 /* Process a list of type modifier keywords
4656 (such as const or volatile) that were given inside the `*'. */
4658 if (TREE_TYPE (declarator))
4660 register tree typemodlist;
4666 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4667 typemodlist = TREE_CHAIN (typemodlist))
4669 tree qualifier = TREE_VALUE (typemodlist);
4671 if (C_IS_RESERVED_WORD (qualifier))
4673 if (C_RID_CODE (qualifier) == RID_CONST)
4675 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4677 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4687 error ("invalid type modifier within pointer declarator");
4688 if (constp > 1 && ! flag_isoc99)
4689 pedwarn ("duplicate `const'");
4690 if (volatilep > 1 && ! flag_isoc99)
4691 pedwarn ("duplicate `volatile'");
4692 if (restrictp > 1 && ! flag_isoc99)
4693 pedwarn ("duplicate `restrict'");
4695 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4696 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4697 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4700 declarator = TREE_OPERAND (declarator, 0);
4707 /* Now TYPE has the actual type. */
4709 /* Did array size calculations overflow? */
4711 if (TREE_CODE (type) == ARRAY_TYPE
4712 && COMPLETE_TYPE_P (type)
4713 && TREE_OVERFLOW (TYPE_SIZE (type)))
4714 error ("size of array `%s' is too large", name);
4716 /* If this is declaring a typedef name, return a TYPE_DECL. */
4718 if (specbits & (1 << (int) RID_TYPEDEF))
4721 /* Note that the grammar rejects storage classes
4722 in typenames, fields or parameters */
4723 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4725 pedwarn ("ISO C forbids qualified function types");
4727 type = c_build_qualified_type (type, type_quals);
4728 decl = build_decl (TYPE_DECL, declarator, type);
4729 if ((specbits & (1 << (int) RID_SIGNED))
4730 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4731 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4735 /* Detect the case of an array type of unspecified size
4736 which came, as such, direct from a typedef name.
4737 We must copy the type, so that each identifier gets
4738 a distinct type, so that each identifier's size can be
4739 controlled separately by its own initializer. */
4741 if (type != 0 && typedef_type != 0
4742 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4743 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4745 type = build_array_type (TREE_TYPE (type), 0);
4747 C_TYPE_VARIABLE_SIZE (type) = 1;
4750 /* If this is a type name (such as, in a cast or sizeof),
4751 compute the type and return it now. */
4753 if (decl_context == TYPENAME)
4755 /* Note that the grammar rejects storage classes
4756 in typenames, fields or parameters */
4757 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4759 pedwarn ("ISO C forbids const or volatile function types");
4761 type = c_build_qualified_type (type, type_quals);
4765 /* Aside from typedefs and type names (handle above),
4766 `void' at top level (not within pointer)
4767 is allowed only in public variables.
4768 We don't complain about parms either, but that is because
4769 a better error message can be made later. */
4771 if (VOID_TYPE_P (type) && decl_context != PARM
4772 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4773 && ((specbits & (1 << (int) RID_EXTERN))
4774 || (current_binding_level == global_binding_level
4776 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4778 error ("variable or field `%s' declared void", name);
4779 type = integer_type_node;
4782 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4783 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4788 if (decl_context == PARM)
4790 tree type_as_written = type;
4793 /* A parameter declared as an array of T is really a pointer to T.
4794 One declared as a function is really a pointer to a function. */
4796 if (TREE_CODE (type) == ARRAY_TYPE)
4798 /* Transfer const-ness of array into that of type pointed to. */
4799 type = TREE_TYPE (type);
4801 type = c_build_qualified_type (type, type_quals);
4802 type = build_pointer_type (type);
4803 type_quals = TYPE_UNQUALIFIED;
4806 else if (TREE_CODE (type) == FUNCTION_TYPE)
4808 if (pedantic && type_quals)
4809 pedwarn ("ISO C forbids qualified function types");
4811 type = c_build_qualified_type (type, type_quals);
4812 type = build_pointer_type (type);
4813 type_quals = TYPE_UNQUALIFIED;
4816 decl = build_decl (PARM_DECL, declarator, type);
4818 C_DECL_VARIABLE_SIZE (decl) = 1;
4820 /* Compute the type actually passed in the parmlist,
4821 for the case where there is no prototype.
4822 (For example, shorts and chars are passed as ints.)
4823 When there is a prototype, this is overridden later. */
4825 if (type == error_mark_node)
4826 promoted_type = type;
4829 promoted_type = simple_type_promotes_to (type);
4830 if (! promoted_type)
4831 promoted_type = type;
4834 DECL_ARG_TYPE (decl) = promoted_type;
4835 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4837 else if (decl_context == FIELD)
4839 /* Structure field. It may not be a function. */
4841 if (TREE_CODE (type) == FUNCTION_TYPE)
4843 error ("field `%s' declared as a function", name);
4844 type = build_pointer_type (type);
4846 else if (TREE_CODE (type) != ERROR_MARK
4847 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4849 error ("field `%s' has incomplete type", name);
4850 type = error_mark_node;
4852 /* Move type qualifiers down to element of an array. */
4853 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4855 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4857 TYPE_DOMAIN (type));
4859 /* Leave the field const or volatile as well. */
4860 type_quals = TYPE_UNQUALIFIED;
4863 decl = build_decl (FIELD_DECL, declarator, type);
4864 DECL_NONADDRESSABLE_P (decl) = bitfield;
4867 C_DECL_VARIABLE_SIZE (decl) = 1;
4869 else if (TREE_CODE (type) == FUNCTION_TYPE)
4871 /* Every function declaration is "external"
4872 except for those which are inside a function body
4873 in which `auto' is used.
4874 That is a case not specified by ANSI C,
4875 and we use it for forward declarations for nested functions. */
4876 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4877 || current_binding_level == global_binding_level);
4879 if (specbits & (1 << (int) RID_AUTO)
4880 && (pedantic || current_binding_level == global_binding_level))
4881 pedwarn ("invalid storage class for function `%s'", name);
4882 if (specbits & (1 << (int) RID_REGISTER))
4883 error ("invalid storage class for function `%s'", name);
4884 /* Function declaration not at top level.
4885 Storage classes other than `extern' are not allowed
4886 and `extern' makes no difference. */
4887 if (current_binding_level != global_binding_level
4888 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4890 pedwarn ("invalid storage class for function `%s'", name);
4892 decl = build_decl (FUNCTION_DECL, declarator, type);
4893 decl = build_decl_attribute_variant (decl, decl_machine_attr);
4895 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4896 pedwarn ("ISO C forbids qualified function types");
4898 /* GNU C interprets a `volatile void' return type to indicate
4899 that the function does not return. */
4900 if ((type_quals & TYPE_QUAL_VOLATILE)
4901 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4902 warning ("`noreturn' function returns non-void value");
4905 DECL_EXTERNAL (decl) = 1;
4906 /* Record absence of global scope for `static' or `auto'. */
4908 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4910 /* Record presence of `inline', if it is reasonable. */
4913 if (MAIN_NAME_P (declarator))
4914 warning ("cannot inline function `main'");
4916 /* Assume that otherwise the function can be inlined. */
4917 DECL_INLINE (decl) = 1;
4919 if (specbits & (1 << (int) RID_EXTERN))
4920 current_extern_inline = 1;
4925 /* It's a variable. */
4926 /* An uninitialized decl with `extern' is a reference. */
4927 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4929 /* Move type qualifiers down to element of an array. */
4930 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4932 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4934 TYPE_DOMAIN (type));
4935 #if 0 /* Leave the variable const or volatile as well. */
4936 type_quals = TYPE_UNQUALIFIED;
4940 decl = build_decl (VAR_DECL, declarator, type);
4942 C_DECL_VARIABLE_SIZE (decl) = 1;
4945 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4947 DECL_EXTERNAL (decl) = extern_ref;
4948 /* At top level, the presence of a `static' or `register' storage
4949 class specifier, or the absence of all storage class specifiers
4950 makes this declaration a definition (perhaps tentative). Also,
4951 the absence of both `static' and `register' makes it public. */
4952 if (current_binding_level == global_binding_level)
4956 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
4957 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
4959 /* Not at top level, only `static' makes a static definition. */
4962 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4963 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
4967 /* Record `register' declaration for warnings on &
4968 and in case doing stupid register allocation. */
4970 if (specbits & (1 << (int) RID_REGISTER))
4971 DECL_REGISTER (decl) = 1;
4973 /* Record constancy and volatility. */
4974 c_apply_type_quals_to_decl (type_quals, decl);
4976 /* If a type has volatile components, it should be stored in memory.
4977 Otherwise, the fact that those components are volatile
4978 will be ignored, and would even crash the compiler. */
4979 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4980 mark_addressable (decl);
4986 /* Decode the parameter-list info for a function type or function definition.
4987 The argument is the value returned by `get_parm_info' (or made in parse.y
4988 if there is an identifier list instead of a parameter decl list).
4989 These two functions are separate because when a function returns
4990 or receives functions then each is called multiple times but the order
4991 of calls is different. The last call to `grokparms' is always the one
4992 that contains the formal parameter names of a function definition.
4994 Store in `last_function_parms' a chain of the decls of parms.
4995 Also store in `last_function_parm_tags' a chain of the struct, union,
4996 and enum tags declared among the parms.
4998 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5000 FUNCDEF_FLAG is nonzero for a function definition, 0 for
5001 a mere declaration. A nonempty identifier-list gets an error message
5002 when FUNCDEF_FLAG is zero. */
5005 grokparms (parms_info, funcdef_flag)
5009 tree first_parm = TREE_CHAIN (parms_info);
5011 last_function_parms = TREE_PURPOSE (parms_info);
5012 last_function_parm_tags = TREE_VALUE (parms_info);
5014 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
5015 && !in_system_header)
5016 warning ("function declaration isn't a prototype");
5019 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
5022 pedwarn ("parameter names (without types) in function declaration");
5024 last_function_parms = first_parm;
5031 /* We no longer test FUNCDEF_FLAG.
5032 If the arg types are incomplete in a declaration,
5033 they must include undefined tags.
5034 These tags can never be defined in the scope of the declaration,
5035 so the types can never be completed,
5036 and no call can be compiled successfully. */
5038 /* In a fcn definition, arg types must be complete. */
5041 for (parm = last_function_parms, typelt = first_parm;
5043 parm = TREE_CHAIN (parm))
5044 /* Skip over any enumeration constants declared here. */
5045 if (TREE_CODE (parm) == PARM_DECL)
5047 /* Barf if the parameter itself has an incomplete type. */
5048 tree type = TREE_VALUE (typelt);
5049 if (!COMPLETE_TYPE_P (type))
5051 if (funcdef_flag && DECL_NAME (parm) != 0)
5052 error ("parameter `%s' has incomplete type",
5053 IDENTIFIER_POINTER (DECL_NAME (parm)));
5055 warning ("parameter has incomplete type");
5058 TREE_VALUE (typelt) = error_mark_node;
5059 TREE_TYPE (parm) = error_mark_node;
5063 /* This has been replaced by parm_tags_warning, which
5064 uses a more accurate criterion for what to warn
5068 /* Now warn if is a pointer to an incomplete type. */
5069 while (TREE_CODE (type) == POINTER_TYPE
5070 || TREE_CODE (type) == REFERENCE_TYPE)
5071 type = TREE_TYPE (type);
5072 type = TYPE_MAIN_VARIANT (type);
5073 if (!COMPLETE_TYPE_P (type))
5075 if (DECL_NAME (parm) != 0)
5076 warning ("parameter `%s' points to incomplete type",
5077 IDENTIFIER_POINTER (DECL_NAME (parm)));
5079 warning ("parameter points to incomplete type");
5083 typelt = TREE_CHAIN (typelt);
5090 /* Return a tree_list node with info on a parameter list just parsed.
5091 The TREE_PURPOSE is a chain of decls of those parms.
5092 The TREE_VALUE is a list of structure, union and enum tags defined.
5093 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5094 This tree_list node is later fed to `grokparms'.
5096 VOID_AT_END nonzero means append `void' to the end of the type-list.
5097 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5100 get_parm_info (void_at_end)
5103 register tree decl, t;
5104 register tree types = 0;
5106 tree tags = gettags ();
5107 tree parms = getdecls ();
5109 tree order = current_binding_level->parm_order;
5111 /* Just `void' (and no ellipsis) is special. There are really no parms.
5112 But if the `void' is qualified (by `const' or `volatile') or has a
5113 storage class specifier (`register'), then the behavior is undefined;
5114 by not counting it as the special case of `void' we will cause an
5115 error later. Typedefs for `void' are OK (see DR#157). */
5116 if (void_at_end && parms != 0
5117 && TREE_CHAIN (parms) == 0
5118 && VOID_TYPE_P (TREE_TYPE (parms))
5119 && ! TREE_THIS_VOLATILE (parms)
5120 && ! TREE_READONLY (parms)
5121 && ! DECL_REGISTER (parms)
5122 && DECL_NAME (parms) == 0)
5125 storedecls (NULL_TREE);
5126 return tree_cons (NULL_TREE, NULL_TREE,
5127 tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5130 /* Extract enumerator values and other non-parms declared with the parms.
5131 Likewise any forward parm decls that didn't have real parm decls. */
5132 for (decl = parms; decl;)
5134 tree next = TREE_CHAIN (decl);
5136 if (TREE_CODE (decl) != PARM_DECL)
5138 TREE_CHAIN (decl) = new_parms;
5141 else if (TREE_ASM_WRITTEN (decl))
5143 error_with_decl (decl,
5144 "parameter `%s' has just a forward declaration");
5145 TREE_CHAIN (decl) = new_parms;
5151 /* Put the parm decls back in the order they were in in the parm list. */
5152 for (t = order; t; t = TREE_CHAIN (t))
5155 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5157 TREE_CHAIN (TREE_VALUE (t)) = 0;
5160 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5163 /* Store the parmlist in the binding level since the old one
5164 is no longer a valid list. (We have changed the chain pointers.) */
5165 storedecls (new_parms);
5167 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5168 /* There may also be declarations for enumerators if an enumeration
5169 type is declared among the parms. Ignore them here. */
5170 if (TREE_CODE (decl) == PARM_DECL)
5172 /* Since there is a prototype,
5173 args are passed in their declared types. */
5174 tree type = TREE_TYPE (decl);
5175 DECL_ARG_TYPE (decl) = type;
5176 if (PROMOTE_PROTOTYPES
5177 && (TREE_CODE (type) == INTEGER_TYPE
5178 || TREE_CODE (type) == ENUMERAL_TYPE)
5179 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5180 DECL_ARG_TYPE (decl) = integer_type_node;
5182 types = tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5183 if (VOID_TYPE_P (TREE_VALUE (types)) && ! erred
5184 && DECL_NAME (decl) == 0)
5186 error ("`void' in parameter list must be the entire list");
5192 return tree_cons (new_parms, tags,
5193 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
5195 return tree_cons (new_parms, tags, nreverse (types));
5198 /* At end of parameter list, warn about any struct, union or enum tags
5199 defined within. Do so because these types cannot ever become complete. */
5202 parmlist_tags_warning ()
5207 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5209 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5210 /* An anonymous union parm type is meaningful as a GNU extension.
5211 So don't warn for that. */
5212 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5214 if (TREE_PURPOSE (elt) != 0)
5215 warning ("`%s %s' declared inside parameter list",
5216 (code == RECORD_TYPE ? "struct"
5217 : code == UNION_TYPE ? "union"
5219 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5222 /* For translation these need to be seperate warnings */
5223 if (code == RECORD_TYPE)
5224 warning ("anonymous struct declared inside parameter list");
5225 else if (code == UNION_TYPE)
5226 warning ("anonymous union declared inside parameter list");
5228 warning ("anonymous enum declared inside parameter list");
5232 warning ("its scope is only this definition or declaration, which is probably not what you want.");
5238 /* Get the struct, enum or union (CODE says which) with tag NAME.
5239 Define the tag as a forward-reference if it is not defined. */
5242 xref_tag (code, name)
5243 enum tree_code code;
5246 /* If a cross reference is requested, look up the type
5247 already defined for this tag and return it. */
5249 register tree ref = lookup_tag (code, name, current_binding_level, 0);
5250 /* Even if this is the wrong type of tag, return what we found.
5251 There will be an error message anyway, from pending_xref_error.
5252 If we create an empty xref just for an invalid use of the type,
5253 the main result is to create lots of superfluous error messages. */
5257 /* If no such tag is yet defined, create a forward-reference node
5258 and record it as the "definition".
5259 When a real declaration of this type is found,
5260 the forward-reference will be altered into a real type. */
5262 ref = make_node (code);
5263 if (code == ENUMERAL_TYPE)
5265 /* (In ANSI, Enums can be referred to only if already defined.) */
5267 pedwarn ("ISO C forbids forward references to `enum' types");
5268 /* Give the type a default layout like unsigned int
5269 to avoid crashing if it does not get defined. */
5270 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5271 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5272 TYPE_USER_ALIGN (ref) = 0;
5273 TREE_UNSIGNED (ref) = 1;
5274 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5275 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5276 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5279 pushtag (name, ref);
5284 /* Make sure that the tag NAME is defined *in the current binding level*
5285 at least as a forward reference.
5286 CODE says which kind of tag NAME ought to be. */
5289 start_struct (code, name)
5290 enum tree_code code;
5293 /* If there is already a tag defined at this binding level
5294 (as a forward reference), just return it. */
5296 register tree ref = 0;
5299 ref = lookup_tag (code, name, current_binding_level, 1);
5300 if (ref && TREE_CODE (ref) == code)
5302 C_TYPE_BEING_DEFINED (ref) = 1;
5303 TYPE_PACKED (ref) = flag_pack_struct;
5304 if (TYPE_FIELDS (ref))
5305 error ("redefinition of `%s %s'",
5306 code == UNION_TYPE ? "union" : "struct",
5307 IDENTIFIER_POINTER (name));
5312 /* Otherwise create a forward-reference just so the tag is in scope. */
5314 ref = make_node (code);
5315 pushtag (name, ref);
5316 C_TYPE_BEING_DEFINED (ref) = 1;
5317 TYPE_PACKED (ref) = flag_pack_struct;
5321 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5322 of a structure component, returning a FIELD_DECL node.
5323 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5325 This is done during the parsing of the struct declaration.
5326 The FIELD_DECL nodes are chained together and the lot of them
5327 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5330 grokfield (filename, line, declarator, declspecs, width)
5331 const char *filename ATTRIBUTE_UNUSED;
5332 int line ATTRIBUTE_UNUSED;
5333 tree declarator, declspecs, width;
5337 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5339 finish_decl (value, NULL_TREE, NULL_TREE);
5340 DECL_INITIAL (value) = width;
5342 maybe_objc_check_decl (value);
5346 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5347 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5348 ATTRIBUTES are attributes to be applied to the structure. */
5351 finish_struct (t, fieldlist, attributes)
5357 int toplevel = global_binding_level == current_binding_level;
5359 /* If this type was previously laid out as a forward reference,
5360 make sure we lay it out again. */
5364 decl_attributes (t, attributes, NULL_TREE);
5366 /* Nameless union parm types are useful as GCC extension. */
5367 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5368 /* Otherwise, warn about any struct or union def. in parmlist. */
5369 if (in_parm_level_p ())
5372 pedwarn ("%s defined inside parms",
5373 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5374 else if (! flag_traditional)
5375 warning ("%s defined inside parms",
5376 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5381 for (x = fieldlist; x; x = TREE_CHAIN (x))
5382 if (DECL_NAME (x) != 0)
5386 pedwarn ("%s has no %s",
5387 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
5388 fieldlist ? _("named members") : _("members"));
5391 /* Install struct as DECL_CONTEXT of each field decl.
5392 Also process specified field sizes,m which is found in the DECL_INITIAL.
5393 Store 0 there, except for ": 0" fields (so we can find them
5394 and delete them, below). */
5396 for (x = fieldlist; x; x = TREE_CHAIN (x))
5398 DECL_CONTEXT (x) = t;
5399 DECL_PACKED (x) |= TYPE_PACKED (t);
5401 /* If any field is const, the structure type is pseudo-const. */
5402 if (TREE_READONLY (x))
5403 C_TYPE_FIELDS_READONLY (t) = 1;
5406 /* A field that is pseudo-const makes the structure likewise. */
5407 tree t1 = TREE_TYPE (x);
5408 while (TREE_CODE (t1) == ARRAY_TYPE)
5409 t1 = TREE_TYPE (t1);
5410 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5411 && C_TYPE_FIELDS_READONLY (t1))
5412 C_TYPE_FIELDS_READONLY (t) = 1;
5415 /* Any field that is volatile means variables of this type must be
5416 treated in some ways as volatile. */
5417 if (TREE_THIS_VOLATILE (x))
5418 C_TYPE_FIELDS_VOLATILE (t) = 1;
5420 /* Any field of nominal variable size implies structure is too. */
5421 if (C_DECL_VARIABLE_SIZE (x))
5422 C_TYPE_VARIABLE_SIZE (t) = 1;
5424 /* Detect invalid nested redefinition. */
5425 if (TREE_TYPE (x) == t)
5426 error ("nested redefinition of `%s'",
5427 IDENTIFIER_POINTER (TYPE_NAME (t)));
5429 /* Detect invalid bit-field size. */
5430 if (DECL_INITIAL (x))
5431 STRIP_NOPS (DECL_INITIAL (x));
5432 if (DECL_INITIAL (x))
5434 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5435 constant_expression_warning (DECL_INITIAL (x));
5439 "bit-field `%s' width not an integer constant");
5440 DECL_INITIAL (x) = NULL;
5444 /* Detect invalid bit-field type. */
5445 if (DECL_INITIAL (x)
5446 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5447 && TREE_CODE (TREE_TYPE (x)) != BOOLEAN_TYPE
5448 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5450 error_with_decl (x, "bit-field `%s' has invalid type");
5451 DECL_INITIAL (x) = NULL;
5454 if (DECL_INITIAL (x) && pedantic
5455 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5456 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5457 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != c_bool_type_node
5458 /* Accept an enum that's equivalent to int or unsigned int. */
5459 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5460 && (TYPE_PRECISION (TREE_TYPE (x))
5461 == TYPE_PRECISION (integer_type_node))))
5462 pedwarn_with_decl (x, "bit-field `%s' type invalid in ISO C");
5464 /* Detect and ignore out of range field width and process valid
5466 if (DECL_INITIAL (x))
5469 if (TYPE_MAIN_VARIANT (TREE_TYPE (x)) == c_bool_type_node)
5470 max_width = CHAR_TYPE_SIZE;
5472 max_width = TYPE_PRECISION (TREE_TYPE (x));
5473 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5474 error_with_decl (x, "negative width in bit-field `%s'");
5475 else if (0 < compare_tree_int (DECL_INITIAL (x), max_width))
5476 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5477 else if (integer_zerop (DECL_INITIAL (x)) && DECL_NAME (x) != 0)
5478 error_with_decl (x, "zero width for bit-field `%s'");
5481 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
5482 unsigned HOST_WIDE_INT width
5483 = TREE_INT_CST_LOW (DECL_INITIAL (x));
5485 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5486 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5487 TREE_UNSIGNED (TREE_TYPE (x)))
5489 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5490 TREE_UNSIGNED (TREE_TYPE (x))))))
5491 warning_with_decl (x,
5492 "`%s' is narrower than values of its type");
5494 DECL_SIZE (x) = bitsize_int (width);
5495 DECL_BIT_FIELD (x) = 1;
5496 SET_DECL_C_BIT_FIELD (x);
5500 /* field size 0 => force desired amount of alignment. */
5501 #ifdef EMPTY_FIELD_BOUNDARY
5502 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5504 #ifdef PCC_BITFIELD_TYPE_MATTERS
5505 if (PCC_BITFIELD_TYPE_MATTERS)
5507 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5508 TYPE_ALIGN (TREE_TYPE (x)));
5509 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5516 else if (TREE_TYPE (x) != error_mark_node)
5518 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5519 : TYPE_ALIGN (TREE_TYPE (x)));
5521 /* Non-bit-fields are aligned for their type, except packed
5522 fields which require only BITS_PER_UNIT alignment. */
5523 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5524 if (! DECL_PACKED (x))
5525 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5528 DECL_INITIAL (x) = 0;
5531 /* Delete all duplicate fields from the fieldlist */
5532 for (x = fieldlist; x && TREE_CHAIN (x);)
5533 /* Anonymous fields aren't duplicates. */
5534 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5538 register tree y = fieldlist;
5542 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5548 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5550 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5551 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5557 /* Now we have the nearly final fieldlist. Record it,
5558 then lay out the structure or union (including the fields). */
5560 TYPE_FIELDS (t) = fieldlist;
5564 /* Delete all zero-width bit-fields from the fieldlist */
5566 tree *fieldlistp = &fieldlist;
5568 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5569 *fieldlistp = TREE_CHAIN (*fieldlistp);
5571 fieldlistp = &TREE_CHAIN (*fieldlistp);
5574 /* Now we have the truly final field list.
5575 Store it in this type and in the variants. */
5577 TYPE_FIELDS (t) = fieldlist;
5579 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5581 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5582 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5583 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5584 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5587 /* If this was supposed to be a transparent union, but we can't
5588 make it one, warn and turn off the flag. */
5589 if (TREE_CODE (t) == UNION_TYPE
5590 && TYPE_TRANSPARENT_UNION (t)
5591 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5593 TYPE_TRANSPARENT_UNION (t) = 0;
5594 warning ("union cannot be made transparent");
5597 /* If this structure or union completes the type of any previous
5598 variable declaration, lay it out and output its rtl. */
5600 if (current_binding_level->n_incomplete != 0)
5603 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5605 if (TYPE_MAIN_VARIANT (TREE_TYPE (decl)) == TYPE_MAIN_VARIANT (t)
5606 && TREE_CODE (decl) != TYPE_DECL)
5608 layout_decl (decl, 0);
5609 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5610 maybe_objc_check_decl (decl);
5611 rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0);
5614 --current_binding_level->n_incomplete;
5616 else if (!COMPLETE_TYPE_P (TREE_TYPE (decl))
5617 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5619 tree element = TREE_TYPE (decl);
5620 while (TREE_CODE (element) == ARRAY_TYPE)
5621 element = TREE_TYPE (element);
5623 layout_array_type (TREE_TYPE (decl));
5628 /* Finish debugging output for this type. */
5629 rest_of_type_compilation (t, toplevel);
5634 /* Lay out the type T, and its element type, and so on. */
5637 layout_array_type (t)
5640 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5641 layout_array_type (TREE_TYPE (t));
5645 /* Begin compiling the definition of an enumeration type.
5646 NAME is its name (or null if anonymous).
5647 Returns the type object, as yet incomplete.
5648 Also records info about it so that build_enumerator
5649 may be used to declare the individual values as they are read. */
5655 register tree enumtype = 0;
5657 /* If this is the real definition for a previous forward reference,
5658 fill in the contents in the same object that used to be the
5659 forward reference. */
5662 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5664 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5666 enumtype = make_node (ENUMERAL_TYPE);
5667 pushtag (name, enumtype);
5670 C_TYPE_BEING_DEFINED (enumtype) = 1;
5672 if (TYPE_VALUES (enumtype) != 0)
5674 /* This enum is a named one that has been declared already. */
5675 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5677 /* Completely replace its old definition.
5678 The old enumerators remain defined, however. */
5679 TYPE_VALUES (enumtype) = 0;
5682 enum_next_value = integer_zero_node;
5685 if (flag_short_enums)
5686 TYPE_PACKED (enumtype) = 1;
5691 /* After processing and defining all the values of an enumeration type,
5692 install their decls in the enumeration type and finish it off.
5693 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5694 and ATTRIBUTES are the specified attributes.
5695 Returns ENUMTYPE. */
5698 finish_enum (enumtype, values, attributes)
5703 register tree pair, tem;
5704 tree minnode = 0, maxnode = 0, enum_value_type;
5705 int precision, unsign;
5706 int toplevel = (global_binding_level == current_binding_level);
5708 if (in_parm_level_p ())
5709 warning ("enum defined inside parms");
5711 decl_attributes (enumtype, attributes, NULL_TREE);
5713 /* Calculate the maximum value of any enumerator in this type. */
5715 if (values == error_mark_node)
5716 minnode = maxnode = integer_zero_node;
5719 minnode = maxnode = TREE_VALUE (values);
5720 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5722 tree value = TREE_VALUE (pair);
5723 if (tree_int_cst_lt (maxnode, value))
5725 if (tree_int_cst_lt (value, minnode))
5730 /* Construct the final type of this enumeration. It is the same
5731 as one of the integral types - the narrowest one that fits, except
5732 that normally we only go as narrow as int - and signed iff any of
5733 the values are negative. */
5734 unsign = (tree_int_cst_sgn (minnode) >= 0);
5735 precision = MAX (min_precision (minnode, unsign),
5736 min_precision (maxnode, unsign));
5737 if (!TYPE_PACKED (enumtype))
5738 precision = MAX (precision, TYPE_PRECISION (integer_type_node));
5739 if (type_for_size (precision, unsign) == 0)
5741 warning ("enumeration values exceed range of largest integer");
5742 precision = TYPE_PRECISION (long_long_integer_type_node);
5745 if (precision == TYPE_PRECISION (integer_type_node))
5746 enum_value_type = type_for_size (precision, 0);
5748 enum_value_type = enumtype;
5750 TYPE_MIN_VALUE (enumtype) = minnode;
5751 TYPE_MAX_VALUE (enumtype) = maxnode;
5752 TYPE_PRECISION (enumtype) = precision;
5753 TREE_UNSIGNED (enumtype) = unsign;
5754 TYPE_SIZE (enumtype) = 0;
5755 layout_type (enumtype);
5757 if (values != error_mark_node)
5759 /* Change the type of the enumerators to be the enum type. We
5760 need to do this irrespective of the size of the enum, for
5761 proper type checking. Replace the DECL_INITIALs of the
5762 enumerators, and the value slots of the list, with copies
5763 that have the enum type; they cannot be modified in place
5764 because they may be shared (e.g. integer_zero_node) Finally,
5765 change the purpose slots to point to the names of the decls. */
5766 for (pair = values; pair; pair = TREE_CHAIN (pair))
5768 tree enu = TREE_PURPOSE (pair);
5770 TREE_TYPE (enu) = enumtype;
5771 DECL_SIZE (enu) = TYPE_SIZE (enumtype);
5772 DECL_SIZE_UNIT (enu) = TYPE_SIZE_UNIT (enumtype);
5773 DECL_ALIGN (enu) = TYPE_ALIGN (enumtype);
5774 DECL_USER_ALIGN (enu) = TYPE_USER_ALIGN (enumtype);
5775 DECL_MODE (enu) = TYPE_MODE (enumtype);
5777 /* The ISO C Standard mandates enumerators to have type int,
5778 even though the underlying type of an enum type is
5779 unspecified. Here we convert any enumerators that fit in
5780 an int to type int, to avoid promotions to unsigned types
5781 when comparing integers with enumerators that fit in the
5782 int range. When -pedantic is given, build_enumerator()
5783 would have already taken care of those that don't fit. */
5784 if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
5785 DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
5787 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5789 TREE_PURPOSE (pair) = DECL_NAME (enu);
5790 TREE_VALUE (pair) = DECL_INITIAL (enu);
5793 TYPE_VALUES (enumtype) = values;
5796 /* Fix up all variant types of this enum type. */
5797 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5799 if (tem == enumtype)
5801 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5802 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5803 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5804 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5805 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5806 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5807 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5808 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5809 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5810 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5813 /* Finish debugging output for this type. */
5814 rest_of_type_compilation (enumtype, toplevel);
5819 /* Build and install a CONST_DECL for one value of the
5820 current enumeration type (one that was begun with start_enum).
5821 Return a tree-list containing the CONST_DECL and its value.
5822 Assignment of sequential values by default is handled here. */
5825 build_enumerator (name, value)
5828 register tree decl, type;
5830 /* Validate and default VALUE. */
5832 /* Remove no-op casts from the value. */
5834 STRIP_TYPE_NOPS (value);
5838 if (TREE_CODE (value) == INTEGER_CST)
5840 value = default_conversion (value);
5841 constant_expression_warning (value);
5845 error ("enumerator value for `%s' not integer constant",
5846 IDENTIFIER_POINTER (name));
5851 /* Default based on previous value. */
5852 /* It should no longer be possible to have NON_LVALUE_EXPR
5856 value = enum_next_value;
5858 error ("overflow in enumeration values");
5861 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5863 pedwarn ("ISO C restricts enumerator values to range of `int'");
5864 value = convert (integer_type_node, value);
5867 /* Set basis for default for next value. */
5868 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5869 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5871 /* Now create a declaration for the enum value name. */
5873 type = TREE_TYPE (value);
5874 type = type_for_size (MAX (TYPE_PRECISION (type),
5875 TYPE_PRECISION (integer_type_node)),
5877 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
5878 && TREE_UNSIGNED (type)));
5880 decl = build_decl (CONST_DECL, name, type);
5881 DECL_INITIAL (decl) = convert (type, value);
5884 return tree_cons (decl, value, NULL_TREE);
5888 /* Create the FUNCTION_DECL for a function definition.
5889 DECLSPECS, DECLARATOR, PREFIX_ATTRIBUTES and ATTRIBUTES are the parts of
5890 the declaration; they describe the function's name and the type it returns,
5891 but twisted together in a fashion that parallels the syntax of C.
5893 This function creates a binding context for the function body
5894 as well as setting up the FUNCTION_DECL in current_function_decl.
5896 Returns 1 on success. If the DECLARATOR is not suitable for a function
5897 (it defines a datum instead), we return 0, which tells
5898 yyparse to report a parse error. */
5901 start_function (declspecs, declarator, prefix_attributes, attributes)
5902 tree declarator, declspecs, prefix_attributes, attributes;
5904 tree decl1, old_decl;
5906 int old_immediate_size_expand = immediate_size_expand;
5908 current_function_returns_value = 0; /* Assume, until we see it does. */
5909 current_function_returns_null = 0;
5910 warn_about_return_type = 0;
5911 current_extern_inline = 0;
5912 c_function_varargs = 0;
5914 shadowed_labels = 0;
5916 /* Don't expand any sizes in the return type of the function. */
5917 immediate_size_expand = 0;
5919 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
5921 /* If the declarator is not suitable for a function definition,
5922 cause a syntax error. */
5925 immediate_size_expand = old_immediate_size_expand;
5929 decl_attributes (decl1, prefix_attributes, attributes);
5931 announce_function (decl1);
5933 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5935 error ("return type is an incomplete type");
5936 /* Make it return void instead. */
5938 = build_function_type (void_type_node,
5939 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5942 if (warn_about_return_type)
5943 pedwarn_c99 ("return type defaults to `int'");
5945 /* Save the parm names or decls from this function's declarator
5946 where store_parm_decls will find them. */
5947 current_function_parms = last_function_parms;
5948 current_function_parm_tags = last_function_parm_tags;
5950 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5951 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5952 DECL_INITIAL (decl1) = error_mark_node;
5954 /* If this definition isn't a prototype and we had a prototype declaration
5955 before, copy the arg type info from that prototype.
5956 But not if what we had before was a builtin function. */
5957 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5958 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5959 && !DECL_BUILT_IN (old_decl)
5960 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5961 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5962 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5964 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5965 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
5966 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
5969 /* If there is no explicit declaration, look for any out-of-scope implicit
5972 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
5974 /* Optionally warn of old-fashioned def with no previous prototype. */
5975 if (warn_strict_prototypes
5976 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5977 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
5978 warning ("function declaration isn't a prototype");
5979 /* Optionally warn of any global def with no previous prototype. */
5980 else if (warn_missing_prototypes
5981 && TREE_PUBLIC (decl1)
5982 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0)
5983 && ! MAIN_NAME_P (DECL_NAME (decl1)))
5984 warning_with_decl (decl1, "no previous prototype for `%s'");
5985 /* Optionally warn of any def with no previous prototype
5986 if the function has already been used. */
5987 else if (warn_missing_prototypes
5988 && old_decl != 0 && TREE_USED (old_decl)
5989 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5990 warning_with_decl (decl1,
5991 "`%s' was used with no prototype before its definition");
5992 /* Optionally warn of any global def with no previous declaration. */
5993 else if (warn_missing_declarations
5994 && TREE_PUBLIC (decl1)
5996 && ! MAIN_NAME_P (DECL_NAME (decl1)))
5997 warning_with_decl (decl1, "no previous declaration for `%s'");
5998 /* Optionally warn of any def with no previous declaration
5999 if the function has already been used. */
6000 else if (warn_missing_declarations
6001 && old_decl != 0 && TREE_USED (old_decl)
6002 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
6003 warning_with_decl (decl1,
6004 "`%s' was used with no declaration before its definition");
6006 /* This is a definition, not a reference.
6007 So normally clear DECL_EXTERNAL.
6008 However, `extern inline' acts like a declaration
6009 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6010 DECL_EXTERNAL (decl1) = current_extern_inline;
6012 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
6013 SET_DEFAULT_DECL_ATTRIBUTES (decl1, attributes);
6016 /* This function exists in static storage.
6017 (This does not mean `static' in the C sense!) */
6018 TREE_STATIC (decl1) = 1;
6020 /* A nested function is not global. */
6021 if (current_function_decl != 0)
6022 TREE_PUBLIC (decl1) = 0;
6024 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6025 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
6030 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6031 != integer_type_node)
6032 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
6034 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
6035 args = TREE_CHAIN (args))
6037 tree type = args ? TREE_VALUE (args) : 0;
6039 if (type == void_type_node)
6046 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6047 pedwarn_with_decl (decl1,
6048 "first argument of `%s' should be `int'");
6052 if (TREE_CODE (type) != POINTER_TYPE
6053 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6054 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6056 pedwarn_with_decl (decl1,
6057 "second argument of `%s' should be `char **'");
6061 if (TREE_CODE (type) != POINTER_TYPE
6062 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6063 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6065 pedwarn_with_decl (decl1,
6066 "third argument of `%s' should probably be `char **'");
6071 /* It is intentional that this message does not mention the third
6072 argument, which is warned for only pedantically, because it's
6073 blessed by mention in an appendix of the standard. */
6074 if (argct > 0 && (argct < 2 || argct > 3))
6075 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
6077 if (argct == 3 && pedantic)
6078 pedwarn_with_decl (decl1, "third argument of `%s' is deprecated");
6080 if (! TREE_PUBLIC (decl1))
6081 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
6084 /* Record the decl so that the function name is defined.
6085 If we already have a decl for this name, and it is a FUNCTION_DECL,
6086 use the old decl. */
6088 current_function_decl = pushdecl (decl1);
6091 declare_parm_level (1);
6092 current_binding_level->subblocks_tag_transparent = 1;
6094 make_function_rtl (current_function_decl);
6096 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6097 /* Promote the value to int before returning it. */
6098 if (C_PROMOTING_INTEGER_TYPE_P (restype))
6100 /* It retains unsignedness if traditional
6101 or if not really getting wider. */
6102 if (TREE_UNSIGNED (restype)
6103 && (flag_traditional
6104 || (TYPE_PRECISION (restype)
6105 == TYPE_PRECISION (integer_type_node))))
6106 restype = unsigned_type_node;
6108 restype = integer_type_node;
6110 DECL_RESULT (current_function_decl)
6111 = build_decl (RESULT_DECL, NULL_TREE, restype);
6113 /* If this fcn was already referenced via a block-scope `extern' decl
6114 (or an implicit decl), propagate certain information about the usage. */
6115 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6116 TREE_ADDRESSABLE (current_function_decl) = 1;
6118 immediate_size_expand = old_immediate_size_expand;
6123 /* Record that this function is going to be a varargs function.
6124 This is called before store_parm_decls, which is too early
6125 to call mark_varargs directly. */
6130 c_function_varargs = 1;
6133 /* Store the parameter declarations into the current function declaration.
6134 This is called after parsing the parameter declarations, before
6135 digesting the body of the function.
6137 For an old-style definition, modify the function's type
6138 to specify at least the number of arguments. */
6143 register tree fndecl = current_function_decl;
6146 /* This is either a chain of PARM_DECLs (if a prototype was used)
6147 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6148 tree specparms = current_function_parms;
6150 /* This is a list of types declared among parms in a prototype. */
6151 tree parmtags = current_function_parm_tags;
6153 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6154 register tree parmdecls = getdecls ();
6156 /* This is a chain of any other decls that came in among the parm
6157 declarations. If a parm is declared with enum {foo, bar} x;
6158 then CONST_DECLs for foo and bar are put here. */
6161 /* Nonzero if this definition is written with a prototype. */
6164 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6166 /* This case is when the function was defined with an ANSI prototype.
6167 The parms already have decls, so we need not do anything here
6168 except record them as in effect
6169 and complain if any redundant old-style parm decls were written. */
6180 error_with_decl (fndecl,
6181 "parm types given both in parmlist and separately");
6182 /* Get rid of the erroneous decls; don't keep them on
6183 the list of parms, since they might not be PARM_DECLs. */
6184 for (decl = current_binding_level->names;
6185 decl; decl = TREE_CHAIN (decl))
6186 if (DECL_NAME (decl))
6187 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6188 for (link = current_binding_level->shadowed;
6189 link; link = TREE_CHAIN (link))
6190 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6191 current_binding_level->names = 0;
6192 current_binding_level->shadowed = 0;
6195 specparms = nreverse (specparms);
6196 for (parm = specparms; parm; parm = next)
6198 next = TREE_CHAIN (parm);
6199 if (TREE_CODE (parm) == PARM_DECL)
6201 if (DECL_NAME (parm) == 0)
6202 error_with_decl (parm, "parameter name omitted");
6203 else if (TREE_CODE (TREE_TYPE (parm)) != ERROR_MARK
6204 && VOID_TYPE_P (TREE_TYPE (parm)))
6206 error_with_decl (parm, "parameter `%s' declared void");
6207 /* Change the type to error_mark_node so this parameter
6208 will be ignored by assign_parms. */
6209 TREE_TYPE (parm) = error_mark_node;
6215 /* If we find an enum constant or a type tag,
6216 put it aside for the moment. */
6217 TREE_CHAIN (parm) = 0;
6218 others = chainon (others, parm);
6222 /* Get the decls in their original chain order
6223 and record in the function. */
6224 DECL_ARGUMENTS (fndecl) = getdecls ();
6227 /* If this function takes a variable number of arguments,
6228 add a phony parameter to the end of the parm list,
6229 to represent the position of the first unnamed argument. */
6230 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6233 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6234 /* Let's hope the address of the unnamed parm
6235 won't depend on its type. */
6236 TREE_TYPE (dummy) = integer_type_node;
6237 DECL_ARG_TYPE (dummy) = integer_type_node;
6238 DECL_ARGUMENTS (fndecl) = chainon (DECL_ARGUMENTS (fndecl), dummy);
6242 /* Now pushdecl the enum constants. */
6243 for (parm = others; parm; parm = next)
6245 next = TREE_CHAIN (parm);
6246 if (DECL_NAME (parm) == 0)
6248 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6250 else if (TREE_CODE (parm) != PARM_DECL)
6254 storetags (chainon (parmtags, gettags ()));
6258 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6259 each with a parm name as the TREE_VALUE.
6261 PARMDECLS is a chain of declarations for parameters.
6262 Warning! It can also contain CONST_DECLs which are not parameters
6263 but are names of enumerators of any enum types
6264 declared among the parameters.
6266 First match each formal parameter name with its declaration.
6267 Associate decls with the names and store the decls
6268 into the TREE_PURPOSE slots. */
6270 /* We use DECL_WEAK as a flag to show which parameters have been
6271 seen already since it is not used on PARM_DECL or CONST_DECL. */
6272 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6273 DECL_WEAK (parm) = 0;
6275 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6277 register tree tail, found = NULL;
6279 if (TREE_VALUE (parm) == 0)
6281 error_with_decl (fndecl,
6282 "parameter name missing from parameter list");
6283 TREE_PURPOSE (parm) = 0;
6287 /* See if any of the parmdecls specifies this parm by name.
6288 Ignore any enumerator decls. */
6289 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6290 if (DECL_NAME (tail) == TREE_VALUE (parm)
6291 && TREE_CODE (tail) == PARM_DECL)
6297 /* If declaration already marked, we have a duplicate name.
6298 Complain, and don't use this decl twice. */
6299 if (found && DECL_WEAK (found))
6301 error_with_decl (found, "multiple parameters named `%s'");
6305 /* If the declaration says "void", complain and ignore it. */
6306 if (found && VOID_TYPE_P (TREE_TYPE (found)))
6308 error_with_decl (found, "parameter `%s' declared void");
6309 TREE_TYPE (found) = integer_type_node;
6310 DECL_ARG_TYPE (found) = integer_type_node;
6311 layout_decl (found, 0);
6314 /* Traditionally, a parm declared float is actually a double. */
6315 if (found && flag_traditional
6316 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6318 TREE_TYPE (found) = double_type_node;
6319 DECL_ARG_TYPE (found) = double_type_node;
6320 layout_decl (found, 0);
6323 /* If no declaration found, default to int. */
6326 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6328 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6329 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6330 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6332 pedwarn_with_decl (found, "type of `%s' defaults to `int'");
6333 else if (extra_warnings)
6334 warning_with_decl (found, "type of `%s' defaults to `int'");
6338 TREE_PURPOSE (parm) = found;
6340 /* Mark this decl as "already found". */
6341 DECL_WEAK (found) = 1;
6344 /* Put anything which is on the parmdecls chain and which is
6345 not a PARM_DECL onto the list NONPARMS. (The types of
6346 non-parm things which might appear on the list include
6347 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6348 any actual PARM_DECLs not matched with any names. */
6351 for (parm = parmdecls; parm;)
6353 tree next = TREE_CHAIN (parm);
6354 TREE_CHAIN (parm) = 0;
6356 if (TREE_CODE (parm) != PARM_DECL)
6357 nonparms = chainon (nonparms, parm);
6360 /* Complain about args with incomplete types. */
6361 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6363 error_with_decl (parm, "parameter `%s' has incomplete type");
6364 TREE_TYPE (parm) = error_mark_node;
6367 if (! DECL_WEAK (parm))
6369 error_with_decl (parm,
6370 "declaration for parameter `%s' but no such parameter");
6371 /* Pretend the parameter was not missing.
6372 This gets us to a standard state and minimizes
6373 further error messages. */
6375 = chainon (specparms,
6376 tree_cons (parm, NULL_TREE, NULL_TREE));
6383 /* Chain the declarations together in the order of the list of
6384 names. Store that chain in the function decl, replacing the
6387 DECL_ARGUMENTS (fndecl) = 0;
6390 for (last = 0; parm; parm = TREE_CHAIN (parm))
6391 if (TREE_PURPOSE (parm))
6394 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6396 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6397 last = TREE_PURPOSE (parm);
6398 TREE_CHAIN (last) = 0;
6402 /* If there was a previous prototype,
6403 set the DECL_ARG_TYPE of each argument according to
6404 the type previously specified, and report any mismatches. */
6406 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6409 for (parm = DECL_ARGUMENTS (fndecl),
6410 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6411 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6412 != void_type_node));
6413 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6415 if (parm == 0 || type == 0
6416 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6418 error ("number of arguments doesn't match prototype");
6419 error_with_file_and_line (current_function_prototype_file,
6420 current_function_prototype_line,
6421 "prototype declaration");
6424 /* Type for passing arg must be consistent
6425 with that declared for the arg. */
6426 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
6428 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6429 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6431 /* Adjust argument to match prototype. E.g. a previous
6432 `int foo(float);' prototype causes
6433 `int foo(x) float x; {...}' to be treated like
6434 `int foo(float x) {...}'. This is particularly
6435 useful for argument types like uid_t. */
6436 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6438 if (PROMOTE_PROTOTYPES
6439 && (TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
6440 || TREE_CODE (TREE_TYPE (parm)) == ENUMERAL_TYPE)
6441 && TYPE_PRECISION (TREE_TYPE (parm))
6442 < TYPE_PRECISION (integer_type_node))
6443 DECL_ARG_TYPE (parm) = integer_type_node;
6447 pedwarn ("promoted argument `%s' doesn't match prototype",
6448 IDENTIFIER_POINTER (DECL_NAME (parm)));
6449 warning_with_file_and_line
6450 (current_function_prototype_file,
6451 current_function_prototype_line,
6452 "prototype declaration");
6455 /* If -traditional, allow `int' argument to match
6456 `unsigned' prototype. */
6457 else if (! (flag_traditional
6458 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6459 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6461 error ("argument `%s' doesn't match prototype",
6462 IDENTIFIER_POINTER (DECL_NAME (parm)));
6463 error_with_file_and_line (current_function_prototype_file,
6464 current_function_prototype_line,
6465 "prototype declaration");
6469 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6472 /* Otherwise, create a prototype that would match. */
6476 tree actual = 0, last = 0, type;
6478 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6480 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6482 TREE_CHAIN (last) = type;
6487 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6489 TREE_CHAIN (last) = type;
6493 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6494 of the type of this function, but we need to avoid having this
6495 affect the types of other similarly-typed functions, so we must
6496 first force the generation of an identical (but separate) type
6497 node for the relevant function type. The new node we create
6498 will be a variant of the main variant of the original function
6501 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6503 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6506 /* Now store the final chain of decls for the arguments
6507 as the decl-chain of the current lexical scope.
6508 Put the enumerators in as well, at the front so that
6509 DECL_ARGUMENTS is not modified. */
6511 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6514 /* Make sure the binding level for the top of the function body
6515 gets a BLOCK if there are any in the function.
6516 Otherwise, the dbx output is wrong. */
6518 keep_next_if_subblocks = 1;
6520 /* ??? This might be an improvement,
6521 but needs to be thought about some more. */
6523 keep_next_level_flag = 1;
6526 /* Write a record describing this function definition to the prototypes
6527 file (if requested). */
6529 gen_aux_info_record (fndecl, 1, 0, prototype);
6531 /* Initialize the RTL code for the function. */
6533 init_function_start (fndecl, input_filename, lineno);
6535 /* Begin the statement tree for this function. */
6536 DECL_LANG_SPECIFIC (current_function_decl)
6537 =((struct lang_decl *) ggc_alloc (sizeof (struct lang_decl)));
6538 begin_stmt_tree (&DECL_SAVED_TREE (current_function_decl));
6540 /* This function is being processed in whole-function mode. */
6541 cfun->x_whole_function_mode_p = 1;
6543 /* Even though we're inside a function body, we still don't want to
6544 call expand_expr to calculate the size of a variable-sized array.
6545 We haven't necessarily assigned RTL to all variables yet, so it's
6546 not safe to try to expand expressions involving them. */
6547 immediate_size_expand = 0;
6548 cfun->x_dont_save_pending_sizes_p = 1;
6551 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6552 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6553 stands for an ellipsis in the identifier list.
6555 PARMLIST is the data returned by get_parm_info for the
6556 parmlist that follows the semicolon.
6558 We return a value of the same sort that get_parm_info returns,
6559 except that it describes the combination of identifiers and parmlist. */
6562 combine_parm_decls (specparms, parmlist, void_at_end)
6563 tree specparms, parmlist;
6566 register tree fndecl = current_function_decl;
6569 tree parmdecls = TREE_PURPOSE (parmlist);
6571 /* This is a chain of any other decls that came in among the parm
6572 declarations. They were separated already by get_parm_info,
6573 so we just need to keep them separate. */
6574 tree nonparms = TREE_VALUE (parmlist);
6578 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6579 DECL_WEAK (parm) = 0;
6581 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6583 register tree tail, found = NULL;
6585 /* See if any of the parmdecls specifies this parm by name. */
6586 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6587 if (DECL_NAME (tail) == TREE_VALUE (parm))
6593 /* If declaration already marked, we have a duplicate name.
6594 Complain, and don't use this decl twice. */
6595 if (found && DECL_WEAK (found))
6597 error_with_decl (found, "multiple parameters named `%s'");
6601 /* If the declaration says "void", complain and ignore it. */
6602 if (found && VOID_TYPE_P (TREE_TYPE (found)))
6604 error_with_decl (found, "parameter `%s' declared void");
6605 TREE_TYPE (found) = integer_type_node;
6606 DECL_ARG_TYPE (found) = integer_type_node;
6607 layout_decl (found, 0);
6610 /* Traditionally, a parm declared float is actually a double. */
6611 if (found && flag_traditional
6612 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6614 TREE_TYPE (found) = double_type_node;
6615 DECL_ARG_TYPE (found) = double_type_node;
6616 layout_decl (found, 0);
6619 /* If no declaration found, default to int. */
6622 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6624 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6625 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6626 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6627 error_with_decl (found, "type of parameter `%s' is not declared");
6631 TREE_PURPOSE (parm) = found;
6633 /* Mark this decl as "already found". */
6634 DECL_WEAK (found) = 1;
6637 /* Complain about any actual PARM_DECLs not matched with any names. */
6639 for (parm = parmdecls; parm;)
6641 tree next = TREE_CHAIN (parm);
6642 TREE_CHAIN (parm) = 0;
6644 /* Complain about args with incomplete types. */
6645 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6647 error_with_decl (parm, "parameter `%s' has incomplete type");
6648 TREE_TYPE (parm) = error_mark_node;
6651 if (! DECL_WEAK (parm))
6653 error_with_decl (parm,
6654 "declaration for parameter `%s' but no such parameter");
6655 /* Pretend the parameter was not missing.
6656 This gets us to a standard state and minimizes
6657 further error messages. */
6659 = chainon (specparms,
6660 tree_cons (parm, NULL_TREE, NULL_TREE));
6666 /* Chain the declarations together in the order of the list of names.
6667 At the same time, build up a list of their types, in reverse order. */
6673 for (last = 0; parm; parm = TREE_CHAIN (parm))
6674 if (TREE_PURPOSE (parm))
6677 parmdecls = TREE_PURPOSE (parm);
6679 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6680 last = TREE_PURPOSE (parm);
6681 TREE_CHAIN (last) = 0;
6683 types = tree_cons (NULL_TREE, TREE_TYPE (parm), types);
6688 return tree_cons (parmdecls, nonparms,
6689 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
6691 return tree_cons (parmdecls, nonparms, nreverse (types));
6694 /* Finish up a function declaration and compile that function
6695 all the way to assembler language output. The free the storage
6696 for the function definition.
6698 This is called after parsing the body of the function definition.
6700 NESTED is nonzero if the function being finished is nested in another. */
6703 finish_function (nested)
6706 register tree fndecl = current_function_decl;
6708 /* TREE_READONLY (fndecl) = 1;
6709 This caused &foo to be of type ptr-to-const-function
6710 which then got a warning when stored in a ptr-to-function variable. */
6713 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6715 /* Must mark the RESULT_DECL as being in this function. */
6717 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6719 /* Obey `register' declarations if `setjmp' is called in this fn. */
6720 if (flag_traditional && current_function_calls_setjmp)
6722 setjmp_protect (DECL_INITIAL (fndecl));
6723 setjmp_protect_args ();
6726 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6728 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6729 != integer_type_node)
6731 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6732 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6734 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
6738 #ifdef DEFAULT_MAIN_RETURN
6739 /* Make it so that `main' always returns success by default. */
6740 DEFAULT_MAIN_RETURN;
6743 c_expand_return (integer_zero_node);
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);
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;
6765 c_function_name_declared_p = 0;
6769 /* Generate the RTL for the body of FNDECL. If NESTED_P is non-zero,
6770 then we are already in the process of generating RTL for another
6774 c_expand_body (fndecl, nested_p)
6778 /* There's no reason to do any of the work here if we're only doing
6779 semantic analysis; this code just generates RTL. */
6780 if (flag_syntax_only)
6783 /* Squirrel away our current state. */
6785 push_function_context ();
6787 /* Initialize the RTL code for the function. */
6788 current_function_decl = fndecl;
6789 init_function_start (fndecl, input_filename, lineno);
6791 /* This function is being processed in whole-function mode. */
6792 cfun->x_whole_function_mode_p = 1;
6794 /* Even though we're inside a function body, we still don't want to
6795 call expand_expr to calculate the size of a variable-sized array.
6796 We haven't necessarily assigned RTL to all variables yet, so it's
6797 not safe to try to expand expressions involving them. */
6798 immediate_size_expand = 0;
6799 cfun->x_dont_save_pending_sizes_p = 1;
6801 /* If this is a varargs function, inform function.c. */
6802 if (c_function_varargs)
6805 /* Set up parameters and prepare for return, for the function. */
6806 expand_function_start (fndecl, 0);
6808 /* If this function is `main', emit a call to `__main'
6809 to run global initializers, etc. */
6810 if (DECL_NAME (fndecl)
6811 && MAIN_NAME_P (DECL_NAME (fndecl))
6812 && DECL_CONTEXT (fndecl) == NULL_TREE)
6813 expand_main_function ();
6815 /* Generate the RTL for this function. */
6816 expand_stmt (DECL_SAVED_TREE (fndecl));
6817 /* Allow the body of the function to be garbage collected. */
6818 DECL_SAVED_TREE (fndecl) = NULL_TREE;
6820 /* We hard-wired immediate_size_expand to zero in start_function.
6821 expand_function_end will decrement this variable. So, we set the
6822 variable to one here, so that after the decrement it will remain
6824 immediate_size_expand = 1;
6826 /* Allow language dialects to perform special processing. */
6827 if (lang_expand_function_end)
6828 (*lang_expand_function_end) ();
6830 /* Generate rtl for function exit. */
6831 expand_function_end (input_filename, lineno, 0);
6833 /* If this is a nested function, protect the local variables in the stack
6834 above us from being collected while we're compiling this function. */
6836 ggc_push_context ();
6838 /* Run the optimizers and output the assembler code for this function. */
6839 rest_of_compilation (fndecl);
6841 /* Undo the GC context switch. */
6845 /* With just -W, complain only if function returns both with
6846 and without a value. */
6848 && current_function_returns_value
6849 && current_function_returns_null)
6850 warning ("this function may return with or without a value");
6852 /* If requested, warn about function definitions where the function will
6853 return a value (usually of some struct or union type) which itself will
6854 take up a lot of stack space. */
6856 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6858 tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6860 if (ret_type && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST
6861 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type),
6864 unsigned int size_as_int
6865 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type));
6867 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0)
6868 warning_with_decl (fndecl,
6869 "size of return value of `%s' is %u bytes",
6872 warning_with_decl (fndecl,
6873 "size of return value of `%s' is larger than %d bytes",
6878 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested_p)
6880 /* Stop pointing to the local nodes about to be freed.
6881 But DECL_INITIAL must remain nonzero so we know this
6882 was an actual function definition.
6883 For a nested function, this is done in pop_c_function_context.
6884 If rest_of_compilation set this to 0, leave it 0. */
6885 if (DECL_INITIAL (fndecl) != 0)
6886 DECL_INITIAL (fndecl) = error_mark_node;
6888 DECL_ARGUMENTS (fndecl) = 0;
6891 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6893 #ifndef ASM_OUTPUT_CONSTRUCTOR
6894 if (! flag_gnu_linker)
6895 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6898 assemble_constructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl)));
6901 if (DECL_STATIC_DESTRUCTOR (fndecl))
6903 #ifndef ASM_OUTPUT_DESTRUCTOR
6904 if (! flag_gnu_linker)
6905 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6908 assemble_destructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl)));
6913 /* Return to the enclosing function. */
6914 pop_function_context ();
6915 /* If the nested function was inline, write it out if that is
6917 if (!TREE_ASM_WRITTEN (fndecl) && TREE_ADDRESSABLE (fndecl))
6919 push_function_context ();
6920 output_inline_function (fndecl);
6921 pop_function_context ();
6927 /* Check the declarations given in a for-loop for satisfying the C99
6930 check_for_loop_decls ()
6936 /* If we get here, declarations have been used in a for loop without
6937 the C99 for loop scope. This doesn't make much sense, so don't
6939 error ("`for' loop initial declaration used outside C99 mode");
6942 /* C99 subclause 6.8.5 paragraph 3:
6944 [#3] The declaration part of a for statement shall only
6945 declare identifiers for objects having storage class auto or
6948 It isn't clear whether, in this sentence, "identifiers" binds to
6949 "shall only declare" or to "objects" - that is, whether all identifiers
6950 declared must be identifiers for objects, or whether the restriction
6951 only applies to those that are. (A question on this in comp.std.c
6952 in November 2000 received no answer.) We implement the strictest
6953 interpretation, to avoid creating an extension which later causes
6956 for (t = gettags (); t; t = TREE_CHAIN (t))
6958 if (TREE_PURPOSE (t) != 0)
6959 error ("`%s %s' declared in `for' loop initial declaration",
6960 (TREE_CODE (TREE_VALUE (t)) == RECORD_TYPE ? "struct"
6961 : TREE_CODE (TREE_VALUE (t)) == UNION_TYPE ? "union"
6963 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6965 for (t = getdecls (); t; t = TREE_CHAIN (t))
6967 if (TREE_CODE (t) != VAR_DECL && DECL_NAME (t))
6968 error_with_decl (t, "declaration of non-variable `%s' in `for' loop initial declaration");
6969 else if (TREE_STATIC (t))
6970 error_with_decl (t, "declaration of static variable `%s' in `for' loop initial declaration");
6971 else if (DECL_EXTERNAL (t))
6972 error_with_decl (t, "declaration of `extern' variable `%s' in `for' loop initial declaration");
6976 /* Save and restore the variables in this file and elsewhere
6977 that keep track of the progress of compilation of the current function.
6978 Used for nested functions. */
6980 struct c_language_function
6982 struct language_function base;
6984 tree shadowed_labels;
6987 int warn_about_return_type;
6989 struct binding_level *binding_level;
6992 /* Save and reinitialize the variables
6993 used during compilation of a C function. */
6996 push_c_function_context (f)
6999 struct c_language_function *p;
7000 p = ((struct c_language_function *)
7001 xmalloc (sizeof (struct c_language_function)));
7002 f->language = (struct language_function *) p;
7004 p->base.x_stmt_tree = c_stmt_tree;
7005 p->base.x_scope_stmt_stack = c_scope_stmt_stack;
7006 p->base.x_function_name_declared_p = c_function_name_declared_p;
7007 p->named_labels = named_labels;
7008 p->shadowed_labels = shadowed_labels;
7009 p->returns_value = current_function_returns_value;
7010 p->returns_null = current_function_returns_null;
7011 p->warn_about_return_type = warn_about_return_type;
7012 p->extern_inline = current_extern_inline;
7013 p->binding_level = current_binding_level;
7016 /* Restore the variables used during compilation of a C function. */
7019 pop_c_function_context (f)
7022 struct c_language_function *p
7023 = (struct c_language_function *) f->language;
7026 /* Bring back all the labels that were shadowed. */
7027 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
7028 if (DECL_NAME (TREE_VALUE (link)) != 0)
7029 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
7030 = TREE_VALUE (link);
7032 if (DECL_SAVED_INSNS (current_function_decl) == 0
7033 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
7035 /* Stop pointing to the local nodes about to be freed. */
7036 /* But DECL_INITIAL must remain nonzero so we know this
7037 was an actual function definition. */
7038 DECL_INITIAL (current_function_decl) = error_mark_node;
7039 DECL_ARGUMENTS (current_function_decl) = 0;
7042 c_stmt_tree = p->base.x_stmt_tree;
7043 c_scope_stmt_stack = p->base.x_scope_stmt_stack;
7044 c_function_name_declared_p = p->base.x_function_name_declared_p;
7045 named_labels = p->named_labels;
7046 shadowed_labels = p->shadowed_labels;
7047 current_function_returns_value = p->returns_value;
7048 current_function_returns_null = p->returns_null;
7049 warn_about_return_type = p->warn_about_return_type;
7050 current_extern_inline = p->extern_inline;
7051 current_binding_level = p->binding_level;
7057 /* Mark the language specific parts of F for GC. */
7060 mark_c_function_context (f)
7063 struct c_language_function *p
7064 = (struct c_language_function *) f->language;
7069 mark_c_language_function (&p->base);
7070 ggc_mark_tree (p->shadowed_labels);
7071 ggc_mark_tree (p->named_labels);
7072 mark_binding_level (&p->binding_level);
7075 /* Copy the DECL_LANG_SEPECIFIC data associated with NODE. */
7078 copy_lang_decl (decl)
7081 struct lang_decl *ld;
7083 if (!DECL_LANG_SPECIFIC (decl))
7086 ld = (struct lang_decl *) ggc_alloc (sizeof (struct lang_decl));
7087 memcpy ((char *) ld, (char *) DECL_LANG_SPECIFIC (decl),
7088 sizeof (struct lang_decl));
7089 DECL_LANG_SPECIFIC (decl) = ld;
7092 /* Mark the language specific bits in T for GC. */
7098 if (TREE_CODE (t) == IDENTIFIER_NODE)
7100 struct lang_identifier *i = (struct lang_identifier *) t;
7101 ggc_mark_tree (i->global_value);
7102 ggc_mark_tree (i->local_value);
7103 ggc_mark_tree (i->label_value);
7104 ggc_mark_tree (i->implicit_decl);
7105 ggc_mark_tree (i->error_locus);
7106 ggc_mark_tree (i->limbo_value);
7108 else if (TYPE_P (t) && TYPE_LANG_SPECIFIC (t))
7109 ggc_mark (TYPE_LANG_SPECIFIC (t));
7110 else if (DECL_P (t) && DECL_LANG_SPECIFIC (t))
7112 ggc_mark (DECL_LANG_SPECIFIC (t));
7113 c_mark_lang_decl (&DECL_LANG_SPECIFIC (t)->base);
7117 /* The functions below are required for functionality of doing
7118 function at once processing in the C front end. Currently these
7119 functions are not called from anywhere in the C front end, but as
7120 these changes continue, that will change. */
7122 /* Returns non-zero if the current statement is a full expression,
7123 i.e. temporaries created during that statement should be destroyed
7124 at the end of the statement. */
7127 stmts_are_full_exprs_p ()
7132 /* Returns the stmt_tree (if any) to which statements are currently
7133 being added. If there is no active statement-tree, NULL is
7137 current_stmt_tree ()
7139 return &c_stmt_tree;
7142 /* Returns the stack of SCOPE_STMTs for the current function. */
7145 current_scope_stmt_stack ()
7147 return &c_scope_stmt_stack;
7150 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
7154 anon_aggr_type_p (node)
7155 tree node ATTRIBUTE_UNUSED;
7160 /* Dummy function in place of callback used by C++. */
7163 extract_interface_info ()
7167 /* Return a new COMPOUND_STMT, after adding it to the current
7171 c_begin_compound_stmt ()
7175 /* Create the COMPOUND_STMT. */
7176 stmt = add_stmt (build_stmt (COMPOUND_STMT, NULL_TREE));
7177 /* If we haven't already declared __FUNCTION__ and its ilk then this
7178 is the opening curly brace of the function. Declare them now. */
7179 if (!c_function_name_declared_p)
7181 c_function_name_declared_p = 1;
7182 declare_function_name ();
7188 /* Expand T (a DECL_STMT) if it declares an entity not handled by the
7192 c_expand_decl_stmt (t)
7195 tree decl = DECL_STMT_DECL (t);
7197 /* Expand nested functions. */
7198 if (TREE_CODE (decl) == FUNCTION_DECL
7199 && DECL_CONTEXT (decl) == current_function_decl
7200 && DECL_SAVED_TREE (decl))
7201 c_expand_body (decl, /*nested_p=*/1);