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. */
46 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
48 { NORMAL, /* Ordinary declaration */
49 FUNCDEF, /* Function definition */
50 PARM, /* Declaration of parm before function body */
51 FIELD, /* Declaration inside struct or union */
52 BITFIELD, /* Likewise but with specified width */
53 TYPENAME}; /* Typename (inside cast or sizeof) */
55 /* We let tm.h override the types used here, to handle trivial differences
56 such as the choice of unsigned int or long unsigned int for size_t.
57 When machines start needing nontrivial differences in the size type,
58 it would be best to do something here to figure out automatically
59 from other information what type to use. */
62 #define SIZE_TYPE "long unsigned int"
66 #define PTRDIFF_TYPE "long int"
70 #define WCHAR_TYPE "int"
74 #define WINT_TYPE "unsigned int"
78 #define INTMAX_TYPE ((INT_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \
80 : ((LONG_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \
86 #define UINTMAX_TYPE ((INT_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \
88 : ((LONG_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \
89 ? "long unsigned int" \
90 : "long long unsigned int"))
93 /* Nonzero if we have seen an invalid cross reference
94 to a struct, union, or enum, but not yet printed the message. */
96 tree pending_invalid_xref;
97 /* File and line to appear in the eventual error message. */
98 const char *pending_invalid_xref_file;
99 int pending_invalid_xref_line;
101 /* While defining an enum type, this is 1 plus the last enumerator
102 constant value. Note that will do not have to save this or `enum_overflow'
103 around nested function definition since such a definition could only
104 occur in an enum value expression and we don't use these variables in
107 static tree enum_next_value;
109 /* Nonzero means that there was overflow computing enum_next_value. */
111 static int enum_overflow;
113 /* Parsing a function declarator leaves a list of parameter names
114 or a chain or parameter decls here. */
116 static tree last_function_parms;
118 /* Parsing a function declarator leaves here a chain of structure
119 and enum types declared in the parmlist. */
121 static tree last_function_parm_tags;
123 /* After parsing the declarator that starts a function definition,
124 `start_function' puts here the list of parameter names or chain of decls.
125 `store_parm_decls' finds it here. */
127 static tree current_function_parms;
129 /* Similar, for last_function_parm_tags. */
130 static tree current_function_parm_tags;
132 /* Similar, for the file and line that the prototype came from if this is
133 an old-style definition. */
134 static const char *current_function_prototype_file;
135 static int current_function_prototype_line;
137 /* The current statement tree. */
139 static struct stmt_tree_s c_stmt_tree;
141 /* The current scope statement stack. */
143 static tree c_scope_stmt_stack;
145 /* Nonzero if __FUNCTION__ and its ilk have been declared in this
148 static int c_function_name_declared_p;
150 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
151 that have names. Here so we can clear out their names' definitions
152 at the end of the function. */
154 static tree named_labels;
156 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
158 static tree shadowed_labels;
160 /* Nonzero when store_parm_decls is called indicates a varargs function.
161 Value not meaningful after store_parm_decls. */
163 static int c_function_varargs;
165 /* Set to 0 at beginning of a function definition, set to 1 if
166 a return statement that specifies a return value is seen. */
168 int current_function_returns_value;
170 /* Set to 0 at beginning of a function definition, set to 1 if
171 a return statement with no argument is seen. */
173 int current_function_returns_null;
175 /* Set to nonzero by `grokdeclarator' for a function
176 whose return type is defaulted, if warnings for this are desired. */
178 static int warn_about_return_type;
180 /* Nonzero when starting a function declared `extern inline'. */
182 static int current_extern_inline;
184 /* For each binding contour we allocate a binding_level structure
185 * which records the names defined in that contour.
188 * 1) one for each function definition,
189 * where internal declarations of the parameters appear.
190 * 2) one for each compound statement,
191 * to record its declarations.
193 * The current meaning of a name can be found by searching the levels from
194 * the current one out to the global one.
197 /* Note that the information in the `names' component of the global contour
198 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
202 /* A chain of _DECL nodes for all variables, constants, functions,
203 and typedef types. These are in the reverse of the order supplied.
207 /* A list of structure, union and enum definitions,
208 * for looking up tag names.
209 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
210 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
211 * or ENUMERAL_TYPE node.
215 /* For each level, a list of shadowed outer-level local definitions
216 to be restored when this level is popped.
217 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
218 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
221 /* For each level (except not the global one),
222 a chain of BLOCK nodes for all the levels
223 that were entered and exited one level down. */
226 /* The BLOCK node for this level, if one has been preallocated.
227 If 0, the BLOCK is allocated (if needed) when the level is popped. */
230 /* The binding level which this one is contained in (inherits from). */
231 struct binding_level *level_chain;
233 /* Nonzero for the level that holds the parameters of a function. */
236 /* Nonzero if this level "doesn't exist" for tags. */
237 char tag_transparent;
239 /* Nonzero if sublevels of this level "don't exist" for tags.
240 This is set in the parm level of a function definition
241 while reading the function body, so that the outermost block
242 of the function body will be tag-transparent. */
243 char subblocks_tag_transparent;
245 /* Nonzero means make a BLOCK for this level regardless of all else. */
248 /* Nonzero means make a BLOCK if this level has any subblocks. */
249 char keep_if_subblocks;
251 /* Number of decls in `names' that have incomplete
252 structure or union types. */
255 /* A list of decls giving the (reversed) specified order of parms,
256 not including any forward-decls in the parmlist.
257 This is so we can put the parms in proper order for assign_parms. */
261 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
263 /* The binding level currently in effect. */
265 static struct binding_level *current_binding_level;
267 /* A chain of binding_level structures awaiting reuse. */
269 static struct binding_level *free_binding_level;
271 /* The outermost binding level, for names of file scope.
272 This is created when the compiler is started and exists
273 through the entire run. */
275 static struct binding_level *global_binding_level;
277 /* Binding level structures are initialized by copying this one. */
279 static struct binding_level clear_binding_level
280 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, 0,
283 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
285 static int keep_next_level_flag;
287 /* Nonzero means make a BLOCK for the next level pushed
288 if it has subblocks. */
290 static int keep_next_if_subblocks;
292 /* The chain of outer levels of label scopes.
293 This uses the same data structure used for binding levels,
294 but it works differently: each link in the chain records
295 saved values of named_labels and shadowed_labels for
296 a label binding level outside the current one. */
298 static struct binding_level *label_level_chain;
300 /* Functions called automatically at the beginning and end of execution. */
302 tree static_ctors, static_dtors;
304 /* Forward declarations. */
306 static struct binding_level * make_binding_level PARAMS ((void));
307 static void mark_binding_level PARAMS ((void *));
308 static void clear_limbo_values PARAMS ((tree));
309 static int duplicate_decls PARAMS ((tree, tree, int));
310 static int redeclaration_error_message PARAMS ((tree, tree));
311 static void storedecls PARAMS ((tree));
312 static void storetags PARAMS ((tree));
313 static tree lookup_tag PARAMS ((enum tree_code, tree,
314 struct binding_level *, int));
315 static tree lookup_tag_reverse PARAMS ((tree));
316 static tree grokdeclarator PARAMS ((tree, tree, enum decl_context,
318 static tree grokparms PARAMS ((tree, int));
319 static void layout_array_type PARAMS ((tree));
320 static tree c_make_fname_decl PARAMS ((tree, const char *, int));
321 static void c_expand_body PARAMS ((tree, int));
323 /* C-specific option variables. */
325 /* Nonzero means allow type mismatches in conditional expressions;
326 just make their values `void'. */
328 int flag_cond_mismatch;
330 /* Nonzero means give `double' the same size as `float'. */
332 int flag_short_double;
334 /* Nonzero means give `wchar_t' the same size as `short'. */
336 int flag_short_wchar;
338 /* Nonzero means don't recognize the keyword `asm'. */
342 /* Nonzero means do some things the same way PCC does. */
344 int flag_traditional;
346 /* Nonzero means enable C89 Amendment 1 features. */
350 /* Nonzero means use the ISO C99 dialect of C. */
354 /* Nonzero means that we have builtin functions, and main is an int */
358 /* Nonzero means add default format_arg attributes for functions not
361 int flag_noniso_default_format_attributes = 1;
363 /* Nonzero means to allow single precision math even if we're generally
364 being traditional. */
365 int flag_allow_single_precision = 0;
367 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
369 int flag_signed_bitfields = 1;
370 int explicit_flag_signed_bitfields = 0;
372 /* Nonzero means warn about use of implicit int. */
374 int warn_implicit_int;
376 /* Nonzero means warn about usage of long long when `-pedantic'. */
378 int warn_long_long = 1;
380 /* Nonzero means message about use of implicit function declarations;
381 1 means warning; 2 means error. */
383 int mesg_implicit_function_declaration = -1;
385 /* Nonzero means give string constants the type `const char *'
386 to get extra warnings from them. These warnings will be too numerous
387 to be useful, except in thoroughly ANSIfied programs. */
389 int flag_const_strings;
391 /* Nonzero means warn about pointer casts that can drop a type qualifier
392 from the pointer target type. */
396 /* Nonzero means warn when casting a function call to a type that does
397 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
398 when there is no previous declaration of sqrt or malloc. */
400 int warn_bad_function_cast;
402 /* Warn about functions which might be candidates for format attributes. */
404 int warn_missing_format_attribute;
406 /* Warn about traditional constructs whose meanings changed in ANSI C. */
408 int warn_traditional;
410 /* Nonzero means warn about sizeof(function) or addition/subtraction
411 of function pointers. */
413 int warn_pointer_arith;
415 /* Nonzero means warn for non-prototype function decls
416 or non-prototyped defs without previous prototype. */
418 int warn_strict_prototypes;
420 /* Nonzero means warn for any global function def
421 without separate previous prototype decl. */
423 int warn_missing_prototypes;
425 /* Nonzero means warn for any global function def
426 without separate previous decl. */
428 int warn_missing_declarations;
430 /* Nonzero means warn about multiple (redundant) decls for the same single
431 variable or function. */
433 int warn_redundant_decls = 0;
435 /* Nonzero means warn about extern declarations of objects not at
436 file-scope level and about *all* declarations of functions (whether
437 extern or static) not at file-scope level. Note that we exclude
438 implicit function declarations. To get warnings about those, use
441 int warn_nested_externs = 0;
443 /* Warn about *printf or *scanf format/argument anomalies. */
447 /* Warn about a subscript that has type char. */
449 int warn_char_subscripts = 0;
451 /* Warn if a type conversion is done that might have confusing results. */
455 /* Warn if adding () is suggested. */
457 int warn_parentheses;
459 /* Warn if initializer is not completely bracketed. */
461 int warn_missing_braces;
463 /* Warn if main is suspicious. */
467 /* Warn about #pragma directives that are not recognised. */
469 int warn_unknown_pragmas = 0; /* Tri state variable. */
471 /* Warn about comparison of signed and unsigned values.
472 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
474 int warn_sign_compare = -1;
476 /* Warn about testing equality of floating point numbers. */
478 int warn_float_equal = 0;
480 /* Nonzero means warn about use of multicharacter literals. */
482 int warn_multichar = 1;
484 /* The variant of the C language being processed. */
486 c_language_kind c_language = clk_c;
488 /* Nonzero means `$' can be in an identifier. */
490 #ifndef DOLLARS_IN_IDENTIFIERS
491 #define DOLLARS_IN_IDENTIFIERS 1
493 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
495 /* Decode the string P as a language-specific option for C.
496 Return the number of strings consumed. Should not complain
497 if it does not recognise the option. */
500 c_decode_option (argc, argv)
501 int argc ATTRIBUTE_UNUSED;
504 int strings_processed;
505 const char *option_value = NULL;
508 strings_processed = cpp_handle_option (parse_in, argc, argv);
510 if (!strcmp (p, "-lang-objc"))
511 c_language = clk_objective_c;
512 else if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
514 flag_traditional = 1;
515 flag_writable_strings = 1;
517 else if (!strcmp (p, "-fallow-single-precision"))
518 flag_allow_single_precision = 1;
519 else if (!strcmp (p, "-fhosted") || !strcmp (p, "-fno-freestanding"))
524 else if (!strcmp (p, "-ffreestanding") || !strcmp (p, "-fno-hosted"))
528 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
532 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
534 flag_traditional = 0;
535 flag_writable_strings = 0;
537 else if (!strncmp (p, "-std=", 5))
539 /* Select the appropriate language standard. We currently
541 -std=iso9899:1990 same as -ansi
542 -std=iso9899:199409 ISO C as modified in amend. 1
543 -std=iso9899:1999 ISO C 99
544 -std=c89 same as -std=iso9899:1990
545 -std=c99 same as -std=iso9899:1999
546 -std=gnu89 default, iso9899:1990 + gnu extensions
547 -std=gnu99 iso9899:1999 + gnu extensions
549 const char *argstart = &p[5];
551 if (!strcmp (argstart, "iso9899:1990")
552 || !strcmp (argstart, "c89"))
557 flag_traditional = 0;
558 flag_writable_strings = 0;
560 flag_no_nonansi_builtin = 1;
561 flag_noniso_default_format_attributes = 0;
564 else if (!strcmp (argstart, "iso9899:199409"))
569 else if (!strcmp (argstart, "iso9899:199x")
570 || !strcmp (argstart, "iso9899:1999")
571 || !strcmp (argstart, "c9x")
572 || !strcmp (argstart, "c99"))
574 flag_traditional = 0;
575 flag_writable_strings = 0;
577 flag_no_nonansi_builtin = 1;
578 flag_noniso_default_format_attributes = 0;
582 else if (!strcmp (argstart, "gnu89"))
584 flag_traditional = 0;
585 flag_writable_strings = 0;
587 flag_no_nonansi_builtin = 0;
588 flag_noniso_default_format_attributes = 1;
592 else if (!strcmp (argstart, "gnu9x") || !strcmp (argstart, "gnu99"))
594 flag_traditional = 0;
595 flag_writable_strings = 0;
597 flag_no_nonansi_builtin = 0;
598 flag_noniso_default_format_attributes = 1;
603 error ("unknown C standard `%s'", argstart);
605 else if (!strcmp (p, "-fdollars-in-identifiers"))
606 dollars_in_ident = 1;
607 else if (!strcmp (p, "-fno-dollars-in-identifiers"))
608 dollars_in_ident = 0;
609 else if (!strcmp (p, "-fsigned-char"))
610 flag_signed_char = 1;
611 else if (!strcmp (p, "-funsigned-char"))
612 flag_signed_char = 0;
613 else if (!strcmp (p, "-fno-signed-char"))
614 flag_signed_char = 0;
615 else if (!strcmp (p, "-fno-unsigned-char"))
616 flag_signed_char = 1;
617 else if (!strcmp (p, "-fsigned-bitfields")
618 || !strcmp (p, "-fno-unsigned-bitfields"))
620 flag_signed_bitfields = 1;
621 explicit_flag_signed_bitfields = 1;
623 else if (!strcmp (p, "-funsigned-bitfields")
624 || !strcmp (p, "-fno-signed-bitfields"))
626 flag_signed_bitfields = 0;
627 explicit_flag_signed_bitfields = 1;
629 else if (!strcmp (p, "-fshort-enums"))
630 flag_short_enums = 1;
631 else if (!strcmp (p, "-fno-short-enums"))
632 flag_short_enums = 0;
633 else if (!strcmp (p, "-fshort-wchar"))
634 flag_short_wchar = 1;
635 else if (!strcmp (p, "-fno-short-wchar"))
636 flag_short_wchar = 0;
637 else if (!strcmp (p, "-fcond-mismatch"))
638 flag_cond_mismatch = 1;
639 else if (!strcmp (p, "-fno-cond-mismatch"))
640 flag_cond_mismatch = 0;
641 else if (!strcmp (p, "-fshort-double"))
642 flag_short_double = 1;
643 else if (!strcmp (p, "-fno-short-double"))
644 flag_short_double = 0;
645 else if (!strcmp (p, "-fasm"))
647 else if (!strcmp (p, "-fno-asm"))
649 else if (!strcmp (p, "-fbuiltin"))
651 else if (!strcmp (p, "-fno-builtin"))
653 else if ((option_value
654 = skip_leading_substring (p, "-fdump-translation-unit-")))
657 error ("no file specified with -fdump-translation-unit");
659 flag_dump_translation_unit = option_value;
661 else if (!strcmp (p, "-ansi"))
663 else if (!strcmp (p, "-Werror-implicit-function-declaration"))
664 mesg_implicit_function_declaration = 2;
665 else if (!strcmp (p, "-Wimplicit-function-declaration"))
666 mesg_implicit_function_declaration = 1;
667 else if (!strcmp (p, "-Wno-implicit-function-declaration"))
668 mesg_implicit_function_declaration = 0;
669 else if (!strcmp (p, "-Wimplicit-int"))
670 warn_implicit_int = 1;
671 else if (!strcmp (p, "-Wno-implicit-int"))
672 warn_implicit_int = 0;
673 else if (!strcmp (p, "-Wimplicit"))
675 warn_implicit_int = 1;
676 if (mesg_implicit_function_declaration != 2)
677 mesg_implicit_function_declaration = 1;
679 else if (!strcmp (p, "-Wno-implicit"))
680 warn_implicit_int = 0, mesg_implicit_function_declaration = 0;
681 else if (!strcmp (p, "-Wlong-long"))
683 else if (!strcmp (p, "-Wno-long-long"))
685 else if (!strcmp (p, "-Wwrite-strings"))
686 flag_const_strings = 1;
687 else if (!strcmp (p, "-Wno-write-strings"))
688 flag_const_strings = 0;
689 else if (!strcmp (p, "-Wcast-qual"))
691 else if (!strcmp (p, "-Wno-cast-qual"))
693 else if (!strcmp (p, "-Wbad-function-cast"))
694 warn_bad_function_cast = 1;
695 else if (!strcmp (p, "-Wno-bad-function-cast"))
696 warn_bad_function_cast = 0;
697 else if (!strcmp (p, "-Wmissing-noreturn"))
698 warn_missing_noreturn = 1;
699 else if (!strcmp (p, "-Wno-missing-noreturn"))
700 warn_missing_noreturn = 0;
701 else if (!strcmp (p, "-Wmissing-format-attribute"))
702 warn_missing_format_attribute = 1;
703 else if (!strcmp (p, "-Wno-missing-format-attribute"))
704 warn_missing_format_attribute = 0;
705 else if (!strcmp (p, "-Wpointer-arith"))
706 warn_pointer_arith = 1;
707 else if (!strcmp (p, "-Wno-pointer-arith"))
708 warn_pointer_arith = 0;
709 else if (!strcmp (p, "-Wstrict-prototypes"))
710 warn_strict_prototypes = 1;
711 else if (!strcmp (p, "-Wno-strict-prototypes"))
712 warn_strict_prototypes = 0;
713 else if (!strcmp (p, "-Wmissing-prototypes"))
714 warn_missing_prototypes = 1;
715 else if (!strcmp (p, "-Wno-missing-prototypes"))
716 warn_missing_prototypes = 0;
717 else if (!strcmp (p, "-Wmissing-declarations"))
718 warn_missing_declarations = 1;
719 else if (!strcmp (p, "-Wno-missing-declarations"))
720 warn_missing_declarations = 0;
721 else if (!strcmp (p, "-Wredundant-decls"))
722 warn_redundant_decls = 1;
723 else if (!strcmp (p, "-Wno-redundant-decls"))
724 warn_redundant_decls = 0;
725 else if (!strcmp (p, "-Wnested-externs"))
726 warn_nested_externs = 1;
727 else if (!strcmp (p, "-Wno-nested-externs"))
728 warn_nested_externs = 0;
729 else if (!strcmp (p, "-Wtraditional"))
730 warn_traditional = 1;
731 else if (!strcmp (p, "-Wno-traditional"))
732 warn_traditional = 0;
733 else if (!strncmp (p, "-Wformat=", 9))
734 warn_format = atol (p + 9);
735 else if (!strcmp (p, "-Wformat"))
737 else if (!strcmp (p, "-Wno-format"))
739 else if (!strcmp (p, "-Wchar-subscripts"))
740 warn_char_subscripts = 1;
741 else if (!strcmp (p, "-Wno-char-subscripts"))
742 warn_char_subscripts = 0;
743 else if (!strcmp (p, "-Wconversion"))
745 else if (!strcmp (p, "-Wno-conversion"))
747 else if (!strcmp (p, "-Wparentheses"))
748 warn_parentheses = 1;
749 else if (!strcmp (p, "-Wno-parentheses"))
750 warn_parentheses = 0;
751 else if (!strcmp (p, "-Wreturn-type"))
752 warn_return_type = 1;
753 else if (!strcmp (p, "-Wno-return-type"))
754 warn_return_type = 0;
755 else if (!strcmp (p, "-Wsequence-point"))
756 warn_sequence_point = 1;
757 else if (!strcmp (p, "-Wno-sequence-point"))
758 warn_sequence_point = 0;
759 else if (!strcmp (p, "-Wcomment"))
760 ; /* cpp handles this one. */
761 else if (!strcmp (p, "-Wno-comment"))
762 ; /* cpp handles this one. */
763 else if (!strcmp (p, "-Wcomments"))
764 ; /* cpp handles this one. */
765 else if (!strcmp (p, "-Wno-comments"))
766 ; /* cpp handles this one. */
767 else if (!strcmp (p, "-Wtrigraphs"))
768 ; /* cpp handles this one. */
769 else if (!strcmp (p, "-Wno-trigraphs"))
770 ; /* cpp handles this one. */
771 else if (!strcmp (p, "-Wundef"))
772 ; /* cpp handles this one. */
773 else if (!strcmp (p, "-Wno-undef"))
774 ; /* cpp handles this one. */
775 else if (!strcmp (p, "-Wimport"))
776 ; /* cpp handles this one. */
777 else if (!strcmp (p, "-Wno-import"))
778 ; /* cpp handles this one. */
779 else if (!strcmp (p, "-Wmissing-braces"))
780 warn_missing_braces = 1;
781 else if (!strcmp (p, "-Wno-missing-braces"))
782 warn_missing_braces = 0;
783 else if (!strcmp (p, "-Wmain"))
785 else if (!strcmp (p, "-Wno-main"))
787 else if (!strcmp (p, "-Wsign-compare"))
788 warn_sign_compare = 1;
789 else if (!strcmp (p, "-Wno-sign-compare"))
790 warn_sign_compare = 0;
791 else if (!strcmp (p, "-Wfloat-equal"))
792 warn_float_equal = 1;
793 else if (!strcmp (p, "-Wno-float-equal"))
794 warn_float_equal = 0;
795 else if (!strcmp (p, "-Wmultichar"))
797 else if (!strcmp (p, "-Wno-multichar"))
799 else if (!strcmp (p, "-Wunknown-pragmas"))
800 /* Set to greater than 1, so that even unknown pragmas in system
801 headers will be warned about. */
802 warn_unknown_pragmas = 2;
803 else if (!strcmp (p, "-Wno-unknown-pragmas"))
804 warn_unknown_pragmas = 0;
805 else if (!strcmp (p, "-Wall"))
807 /* We save the value of warn_uninitialized, since if they put
808 -Wuninitialized on the command line, we need to generate a
809 warning about not using it without also specifying -O. */
810 if (warn_uninitialized != 1)
811 warn_uninitialized = 2;
812 warn_implicit_int = 1;
813 mesg_implicit_function_declaration = 1;
814 warn_return_type = 1;
818 warn_char_subscripts = 1;
819 warn_parentheses = 1;
820 warn_sequence_point = 1;
821 warn_missing_braces = 1;
822 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
823 it off only if it's not explicit. */
825 /* Only warn about unknown pragmas that are not in system headers. */
826 warn_unknown_pragmas = 1;
829 return strings_processed;
834 /* Hooks for print_node. */
837 print_lang_decl (file, node, indent)
838 FILE *file ATTRIBUTE_UNUSED;
839 tree node ATTRIBUTE_UNUSED;
840 int indent ATTRIBUTE_UNUSED;
845 print_lang_type (file, node, indent)
846 FILE *file ATTRIBUTE_UNUSED;
847 tree node ATTRIBUTE_UNUSED;
848 int indent ATTRIBUTE_UNUSED;
853 print_lang_identifier (file, node, indent)
858 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
859 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
860 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
861 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
862 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
863 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
864 if (C_IS_RESERVED_WORD (node))
866 tree rid = ridpointers[C_RID_CODE (node)];
867 indent_to (file, indent + 4);
868 fprintf (file, "rid ");
869 fprintf (file, HOST_PTR_PRINTF, (void *)rid);
870 fprintf (file, " \"%s\"", IDENTIFIER_POINTER (rid));
874 /* Hook called at end of compilation to assume 1 elt
875 for a top-level tentative array defn that wasn't complete before. */
878 finish_incomplete_decl (decl)
881 if (TREE_CODE (decl) == VAR_DECL)
883 tree type = TREE_TYPE (decl);
884 if (type != error_mark_node
885 && TREE_CODE (type) == ARRAY_TYPE
886 && ! DECL_EXTERNAL (decl)
887 && TYPE_DOMAIN (type) == 0)
889 warning_with_decl (decl, "array `%s' assumed to have one element");
891 complete_array_type (type, NULL_TREE, 1);
893 layout_decl (decl, 0);
898 /* Create a new `struct binding_level'. */
900 static struct binding_level *
901 make_binding_level ()
904 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
907 /* Nonzero if we are currently in the global binding level. */
912 return current_binding_level == global_binding_level;
918 keep_next_level_flag = 1;
921 /* Nonzero if the current level needs to have a BLOCK made. */
926 return ((current_binding_level->keep_if_subblocks
927 && current_binding_level->blocks != 0)
928 || current_binding_level->keep
929 || current_binding_level->names != 0
930 || (current_binding_level->tags != 0
931 && !current_binding_level->tag_transparent));
934 /* Identify this binding level as a level of parameters.
935 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
936 But it turns out there is no way to pass the right value for
937 DEFINITION_FLAG, so we ignore it. */
940 declare_parm_level (definition_flag)
941 int definition_flag ATTRIBUTE_UNUSED;
943 current_binding_level->parm_flag = 1;
946 /* Nonzero if currently making parm declarations. */
951 return current_binding_level->parm_flag;
954 /* Enter a new binding level.
955 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
956 not for that of tags. */
959 pushlevel (tag_transparent)
962 register struct binding_level *newlevel = NULL_BINDING_LEVEL;
964 /* If this is the top level of a function,
965 just make sure that NAMED_LABELS is 0. */
967 if (current_binding_level == global_binding_level)
972 /* Reuse or create a struct for this binding level. */
974 if (free_binding_level)
976 newlevel = free_binding_level;
977 free_binding_level = free_binding_level->level_chain;
981 newlevel = make_binding_level ();
984 /* Add this level to the front of the chain (stack) of levels that
987 *newlevel = clear_binding_level;
988 newlevel->tag_transparent
990 || (current_binding_level
991 ? current_binding_level->subblocks_tag_transparent
993 newlevel->level_chain = current_binding_level;
994 current_binding_level = newlevel;
995 newlevel->keep = keep_next_level_flag;
996 keep_next_level_flag = 0;
997 newlevel->keep_if_subblocks = keep_next_if_subblocks;
998 keep_next_if_subblocks = 0;
1001 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
1004 clear_limbo_values (block)
1009 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
1010 if (DECL_NAME (tem) != 0)
1011 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
1013 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
1014 clear_limbo_values (tem);
1017 /* Exit a binding level.
1018 Pop the level off, and restore the state of the identifier-decl mappings
1019 that were in effect when this level was entered.
1021 If KEEP is nonzero, this level had explicit declarations, so
1022 and create a "block" (a BLOCK node) for the level
1023 to record its declarations and subblocks for symbol table output.
1025 If FUNCTIONBODY is nonzero, this level is the body of a function,
1026 so create a block as if KEEP were set and also clear out all
1029 If REVERSE is nonzero, reverse the order of decls before putting
1030 them into the BLOCK. */
1033 poplevel (keep, reverse, functionbody)
1039 /* The chain of decls was accumulated in reverse order.
1040 Put it into forward order, just for cleanliness. */
1042 tree tags = current_binding_level->tags;
1043 tree subblocks = current_binding_level->blocks;
1046 int block_previously_created;
1048 keep |= current_binding_level->keep;
1050 /* This warning is turned off because it causes warnings for
1051 declarations like `extern struct foo *x'. */
1053 /* Warn about incomplete structure types in this level. */
1054 for (link = tags; link; link = TREE_CHAIN (link))
1055 if (!COMPLETE_TYPE_P (TREE_VALUE (link)))
1057 tree type = TREE_VALUE (link);
1058 tree type_name = TYPE_NAME (type);
1059 char *id = IDENTIFIER_POINTER (TREE_CODE (type_name) == IDENTIFIER_NODE
1061 : DECL_NAME (type_name));
1062 switch (TREE_CODE (type))
1065 error ("`struct %s' incomplete in scope ending here", id);
1068 error ("`union %s' incomplete in scope ending here", id);
1071 error ("`enum %s' incomplete in scope ending here", id);
1077 /* Get the decls in the order they were written.
1078 Usually current_binding_level->names is in reverse order.
1079 But parameter decls were previously put in forward order. */
1082 current_binding_level->names
1083 = decls = nreverse (current_binding_level->names);
1085 decls = current_binding_level->names;
1087 /* Output any nested inline functions within this block
1088 if they weren't already output. */
1090 for (decl = decls; decl; decl = TREE_CHAIN (decl))
1091 if (TREE_CODE (decl) == FUNCTION_DECL
1092 && ! TREE_ASM_WRITTEN (decl)
1093 && DECL_INITIAL (decl) != 0
1094 && TREE_ADDRESSABLE (decl))
1096 /* If this decl was copied from a file-scope decl
1097 on account of a block-scope extern decl,
1098 propagate TREE_ADDRESSABLE to the file-scope decl.
1100 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1101 true, since then the decl goes through save_for_inline_copying. */
1102 if (DECL_ABSTRACT_ORIGIN (decl) != 0
1103 && DECL_ABSTRACT_ORIGIN (decl) != decl)
1104 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
1107 /* We used to warn about unused variables in expand_end_bindings,
1108 i.e. while generating RTL. But in function-at-a-time mode we may
1109 choose to never expand a function at all (e.g. auto inlining), so
1110 we do this explicitly now. */
1111 warn_about_unused_variables (getdecls ());
1113 /* If there were any declarations or structure tags in that level,
1114 or if this level is a function body,
1115 create a BLOCK to record them for the life of this function. */
1118 block_previously_created = (current_binding_level->this_block != 0);
1119 if (block_previously_created)
1120 block = current_binding_level->this_block;
1121 else if (keep || functionbody
1122 || (current_binding_level->keep_if_subblocks && subblocks != 0))
1123 block = make_node (BLOCK);
1126 BLOCK_VARS (block) = decls;
1127 BLOCK_SUBBLOCKS (block) = subblocks;
1130 /* In each subblock, record that this is its superior. */
1132 for (link = subblocks; link; link = TREE_CHAIN (link))
1133 BLOCK_SUPERCONTEXT (link) = block;
1135 /* Clear out the meanings of the local variables of this level. */
1137 for (link = decls; link; link = TREE_CHAIN (link))
1139 if (DECL_NAME (link) != 0)
1141 /* If the ident. was used or addressed via a local extern decl,
1142 don't forget that fact. */
1143 if (DECL_EXTERNAL (link))
1145 if (TREE_USED (link))
1146 TREE_USED (DECL_NAME (link)) = 1;
1147 if (TREE_ADDRESSABLE (link))
1148 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1150 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1154 /* Restore all name-meanings of the outer levels
1155 that were shadowed by this level. */
1157 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1158 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1160 /* If the level being exited is the top level of a function,
1161 check over all the labels, and clear out the current
1162 (function local) meanings of their names. */
1166 clear_limbo_values (block);
1168 /* If this is the top level block of a function,
1169 the vars are the function's parameters.
1170 Don't leave them in the BLOCK because they are
1171 found in the FUNCTION_DECL instead. */
1173 BLOCK_VARS (block) = 0;
1175 /* Clear out the definitions of all label names,
1176 since their scopes end here,
1177 and add them to BLOCK_VARS. */
1179 for (link = named_labels; link; link = TREE_CHAIN (link))
1181 register tree label = TREE_VALUE (link);
1183 if (DECL_INITIAL (label) == 0)
1185 error_with_decl (label, "label `%s' used but not defined");
1186 /* Avoid crashing later. */
1187 define_label (input_filename, lineno,
1190 else if (warn_unused_label && !TREE_USED (label))
1191 warning_with_decl (label, "label `%s' defined but not used");
1192 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1194 /* Put the labels into the "variables" of the
1195 top-level block, so debugger can see them. */
1196 TREE_CHAIN (label) = BLOCK_VARS (block);
1197 BLOCK_VARS (block) = label;
1201 /* Pop the current level, and free the structure for reuse. */
1204 register struct binding_level *level = current_binding_level;
1205 current_binding_level = current_binding_level->level_chain;
1207 level->level_chain = free_binding_level;
1208 free_binding_level = level;
1211 /* Dispose of the block that we just made inside some higher level. */
1213 DECL_INITIAL (current_function_decl) = block;
1216 if (!block_previously_created)
1217 current_binding_level->blocks
1218 = chainon (current_binding_level->blocks, block);
1220 /* If we did not make a block for the level just exited,
1221 any blocks made for inner levels
1222 (since they cannot be recorded as subblocks in that level)
1223 must be carried forward so they will later become subblocks
1224 of something else. */
1226 current_binding_level->blocks
1227 = chainon (current_binding_level->blocks, subblocks);
1229 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1230 binding contour so that they point to the appropriate construct, i.e.
1231 either to the current FUNCTION_DECL node, or else to the BLOCK node
1232 we just constructed.
1234 Note that for tagged types whose scope is just the formal parameter
1235 list for some function type specification, we can't properly set
1236 their TYPE_CONTEXTs here, because we don't have a pointer to the
1237 appropriate FUNCTION_TYPE node readily available to us. For those
1238 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1239 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1240 node which will represent the "scope" for these "parameter list local"
1244 for (link = tags; link; link = TREE_CHAIN (link))
1245 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1247 for (link = tags; link; link = TREE_CHAIN (link))
1248 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1251 TREE_USED (block) = 1;
1256 /* Delete the node BLOCK from the current binding level.
1257 This is used for the block inside a stmt expr ({...})
1258 so that the block can be reinserted where appropriate. */
1261 delete_block (block)
1265 if (current_binding_level->blocks == block)
1266 current_binding_level->blocks = TREE_CHAIN (block);
1267 for (t = current_binding_level->blocks; t;)
1269 if (TREE_CHAIN (t) == block)
1270 TREE_CHAIN (t) = TREE_CHAIN (block);
1274 TREE_CHAIN (block) = NULL;
1275 /* Clear TREE_USED which is always set by poplevel.
1276 The flag is set again if insert_block is called. */
1277 TREE_USED (block) = 0;
1280 /* Insert BLOCK at the end of the list of subblocks of the
1281 current binding level. This is used when a BIND_EXPR is expanded,
1282 to handle the BLOCK node inside the BIND_EXPR. */
1285 insert_block (block)
1288 TREE_USED (block) = 1;
1289 current_binding_level->blocks
1290 = chainon (current_binding_level->blocks, block);
1293 /* Set the BLOCK node for the innermost scope
1294 (the one we are currently in). */
1298 register tree block;
1300 current_binding_level->this_block = block;
1306 register struct binding_level *newlevel;
1308 /* Reuse or create a struct for this binding level. */
1310 if (free_binding_level)
1312 newlevel = free_binding_level;
1313 free_binding_level = free_binding_level->level_chain;
1317 newlevel = make_binding_level ();
1320 /* Add this level to the front of the chain (stack) of label levels. */
1322 newlevel->level_chain = label_level_chain;
1323 label_level_chain = newlevel;
1325 newlevel->names = named_labels;
1326 newlevel->shadowed = shadowed_labels;
1328 shadowed_labels = 0;
1334 register struct binding_level *level = label_level_chain;
1337 /* Clear out the definitions of the declared labels in this level.
1338 Leave in the list any ordinary, non-declared labels. */
1339 for (link = named_labels, prev = 0; link;)
1341 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1343 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1345 error_with_decl (TREE_VALUE (link),
1346 "label `%s' used but not defined");
1347 /* Avoid crashing later. */
1348 define_label (input_filename, lineno,
1349 DECL_NAME (TREE_VALUE (link)));
1351 else if (warn_unused_label && !TREE_USED (TREE_VALUE (link)))
1352 warning_with_decl (TREE_VALUE (link),
1353 "label `%s' defined but not used");
1354 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1356 /* Delete this element from the list. */
1357 link = TREE_CHAIN (link);
1359 TREE_CHAIN (prev) = link;
1361 named_labels = link;
1366 link = TREE_CHAIN (link);
1370 /* Bring back all the labels that were shadowed. */
1371 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1372 if (DECL_NAME (TREE_VALUE (link)) != 0)
1373 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1374 = TREE_VALUE (link);
1376 named_labels = chainon (named_labels, level->names);
1377 shadowed_labels = level->shadowed;
1379 /* Pop the current level, and free the structure for reuse. */
1380 label_level_chain = label_level_chain->level_chain;
1381 level->level_chain = free_binding_level;
1382 free_binding_level = level;
1385 /* Push a definition or a declaration of struct, union or enum tag "name".
1386 "type" should be the type node.
1387 We assume that the tag "name" is not already defined.
1389 Note that the definition may really be just a forward reference.
1390 In that case, the TYPE_SIZE will be zero. */
1393 pushtag (name, type)
1396 register struct binding_level *b;
1398 /* Find the proper binding level for this type tag. */
1400 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1405 /* Record the identifier as the type's name if it has none. */
1407 if (TYPE_NAME (type) == 0)
1408 TYPE_NAME (type) = name;
1411 b->tags = tree_cons (name, type, b->tags);
1413 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1414 tagged type we just added to the current binding level. This fake
1415 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1416 to output a representation of a tagged type, and it also gives
1417 us a convenient place to record the "scope start" address for the
1420 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1422 /* An approximation for now, so we can tell this is a function-scope tag.
1423 This will be updated in poplevel. */
1424 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1427 /* Handle when a new declaration NEWDECL
1428 has the same name as an old one OLDDECL
1429 in the same binding contour.
1430 Prints an error message if appropriate.
1432 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1433 Otherwise, return 0.
1435 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1436 and OLDDECL is in an outer binding level and should thus not be changed. */
1439 duplicate_decls (newdecl, olddecl, different_binding_level)
1440 register tree newdecl, olddecl;
1441 int different_binding_level;
1443 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1444 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1445 && DECL_INITIAL (newdecl) != 0);
1446 tree oldtype = TREE_TYPE (olddecl);
1447 tree newtype = TREE_TYPE (newdecl);
1450 if (DECL_P (olddecl))
1451 DECL_MACHINE_ATTRIBUTES (newdecl)
1452 = merge_machine_decl_attributes (olddecl, newdecl);
1454 if (TREE_CODE (newtype) == ERROR_MARK
1455 || TREE_CODE (oldtype) == ERROR_MARK)
1458 /* New decl is completely inconsistent with the old one =>
1459 tell caller to replace the old one.
1460 This is always an error except in the case of shadowing a builtin. */
1461 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1463 if (TREE_CODE (olddecl) == FUNCTION_DECL
1464 && (DECL_BUILT_IN (olddecl)
1465 || DECL_BUILT_IN_NONANSI (olddecl)))
1467 /* If you declare a built-in or predefined function name as static,
1468 the old definition is overridden,
1469 but optionally warn this was a bad choice of name. */
1470 if (!TREE_PUBLIC (newdecl))
1474 else if (DECL_BUILT_IN (olddecl))
1475 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1477 warning_with_decl (newdecl, "shadowing library function `%s'");
1479 /* Likewise, if the built-in is not ansi, then programs can
1480 override it even globally without an error. */
1481 else if (! DECL_BUILT_IN (olddecl))
1482 warning_with_decl (newdecl,
1483 "library function `%s' declared as non-function");
1485 else if (DECL_BUILT_IN_NONANSI (olddecl))
1486 warning_with_decl (newdecl,
1487 "built-in function `%s' declared as non-function");
1489 warning_with_decl (newdecl,
1490 "built-in function `%s' declared as non-function");
1494 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1495 error_with_decl (olddecl, "previous declaration of `%s'");
1501 /* For real parm decl following a forward decl,
1502 return 1 so old decl will be reused. */
1503 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1504 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1507 /* The new declaration is the same kind of object as the old one.
1508 The declarations may partially match. Print warnings if they don't
1509 match enough. Ultimately, copy most of the information from the new
1510 decl to the old one, and keep using the old one. */
1512 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1513 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1514 && DECL_INITIAL (olddecl) == 0)
1515 /* If -traditional, avoid error for redeclaring fcn
1516 after implicit decl. */
1518 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1519 && DECL_BUILT_IN (olddecl))
1521 /* A function declaration for a built-in function. */
1522 if (!TREE_PUBLIC (newdecl))
1524 /* If you declare a built-in function name as static, the
1525 built-in definition is overridden,
1526 but optionally warn this was a bad choice of name. */
1528 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1529 /* Discard the old built-in function. */
1532 else if (!types_match)
1534 /* Accept the return type of the new declaration if same modes. */
1535 tree oldreturntype = TREE_TYPE (oldtype);
1536 tree newreturntype = TREE_TYPE (newtype);
1538 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1540 /* Function types may be shared, so we can't just modify
1541 the return type of olddecl's function type. */
1543 = build_function_type (newreturntype,
1544 TYPE_ARG_TYPES (oldtype));
1546 types_match = comptypes (newtype, trytype);
1550 /* Accept harmless mismatch in first argument type also.
1552 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1553 && TYPE_ARG_TYPES (oldtype) != 0
1554 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1555 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1556 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1557 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1559 /* Function types may be shared, so we can't just modify
1560 the return type of olddecl's function type. */
1562 = build_function_type (TREE_TYPE (oldtype),
1563 tree_cons (NULL_TREE,
1564 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1565 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1567 types_match = comptypes (newtype, trytype);
1571 if (! different_binding_level)
1572 TREE_TYPE (olddecl) = oldtype;
1576 /* If types don't match for a built-in, throw away the built-in. */
1577 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1581 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1582 && DECL_SOURCE_LINE (olddecl) == 0)
1584 /* A function declaration for a predeclared function
1585 that isn't actually built in. */
1586 if (!TREE_PUBLIC (newdecl))
1588 /* If you declare it as static, the
1589 default definition is overridden. */
1592 else if (!types_match)
1594 /* If the types don't match, preserve volatility indication.
1595 Later on, we will discard everything else about the
1596 default declaration. */
1597 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1600 /* Permit char *foo () to match void *foo (...) if not pedantic,
1601 if one of them came from a system header file. */
1602 else if (!types_match
1603 && TREE_CODE (olddecl) == FUNCTION_DECL
1604 && TREE_CODE (newdecl) == FUNCTION_DECL
1605 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1606 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1607 && (DECL_IN_SYSTEM_HEADER (olddecl)
1608 || DECL_IN_SYSTEM_HEADER (newdecl))
1609 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1610 && TYPE_ARG_TYPES (oldtype) == 0
1611 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1612 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1614 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1615 && TYPE_ARG_TYPES (newtype) == 0
1616 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1617 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1620 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1621 /* Make sure we keep void * as ret type, not char *. */
1622 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1623 TREE_TYPE (newdecl) = newtype = oldtype;
1625 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1626 we will come back here again. */
1627 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1629 else if (!types_match
1630 /* Permit char *foo (int, ...); followed by char *foo ();
1632 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1634 /* Return types must still match. */
1635 && comptypes (TREE_TYPE (oldtype),
1636 TREE_TYPE (newtype))
1637 && TYPE_ARG_TYPES (newtype) == 0))
1639 error_with_decl (newdecl, "conflicting types for `%s'");
1640 /* Check for function type mismatch
1641 involving an empty arglist vs a nonempty one. */
1642 if (TREE_CODE (olddecl) == FUNCTION_DECL
1643 && comptypes (TREE_TYPE (oldtype),
1644 TREE_TYPE (newtype))
1645 && ((TYPE_ARG_TYPES (oldtype) == 0
1646 && DECL_INITIAL (olddecl) == 0)
1648 (TYPE_ARG_TYPES (newtype) == 0
1649 && DECL_INITIAL (newdecl) == 0)))
1651 /* Classify the problem further. */
1652 register tree t = TYPE_ARG_TYPES (oldtype);
1654 t = TYPE_ARG_TYPES (newtype);
1655 for (; t; t = TREE_CHAIN (t))
1657 register tree type = TREE_VALUE (t);
1659 if (TREE_CHAIN (t) == 0
1660 && TYPE_MAIN_VARIANT (type) != void_type_node)
1662 error ("A parameter list with an ellipsis can't match an empty parameter name list declaration.");
1666 if (simple_type_promotes_to (type) != NULL_TREE)
1668 error ("An argument type that has a default promotion can't match an empty parameter name list declaration.");
1673 error_with_decl (olddecl, "previous declaration of `%s'");
1677 errmsg = redeclaration_error_message (newdecl, olddecl);
1683 error_with_decl (newdecl, "redefinition of `%s'");
1686 error_with_decl (newdecl, "redeclaration of `%s'");
1689 error_with_decl (newdecl, "conflicting declarations of `%s'");
1695 error_with_decl (olddecl,
1696 ((DECL_INITIAL (olddecl)
1697 && current_binding_level == global_binding_level)
1698 ? "`%s' previously defined here"
1699 : "`%s' previously declared here"));
1701 else if (TREE_CODE (newdecl) == TYPE_DECL
1702 && (DECL_IN_SYSTEM_HEADER (olddecl)
1703 || DECL_IN_SYSTEM_HEADER (newdecl)))
1705 warning_with_decl (newdecl, "redefinition of `%s'");
1708 ((DECL_INITIAL (olddecl)
1709 && current_binding_level == global_binding_level)
1710 ? "`%s' previously defined here"
1711 : "`%s' previously declared here"));
1713 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1714 && DECL_INITIAL (olddecl) != 0
1715 && TYPE_ARG_TYPES (oldtype) == 0
1716 && TYPE_ARG_TYPES (newtype) != 0
1717 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1719 register tree type, parm;
1721 /* Prototype decl follows defn w/o prototype. */
1723 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1724 type = TYPE_ARG_TYPES (newtype),
1727 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1729 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1730 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1732 warning_with_decl (newdecl, "prototype for `%s' follows");
1733 warning_with_decl (olddecl, "non-prototype definition here");
1736 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1737 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1739 error_with_decl (newdecl,
1740 "prototype for `%s' follows and number of arguments doesn't match");
1741 error_with_decl (olddecl, "non-prototype definition here");
1745 /* Type for passing arg must be consistent
1746 with that declared for the arg. */
1747 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1748 /* If -traditional, allow `unsigned int' instead of `int'
1749 in the prototype. */
1750 && (! (flag_traditional
1751 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1752 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1754 error_with_decl (newdecl,
1755 "prototype for `%s' follows and argument %d doesn't match",
1757 error_with_decl (olddecl, "non-prototype definition here");
1763 /* Warn about mismatches in various flags. */
1766 /* Warn if function is now inline
1767 but was previously declared not inline and has been called. */
1768 if (TREE_CODE (olddecl) == FUNCTION_DECL
1769 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1770 && TREE_USED (olddecl))
1771 warning_with_decl (newdecl,
1772 "`%s' declared inline after being called");
1773 if (TREE_CODE (olddecl) == FUNCTION_DECL
1774 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1775 && DECL_INITIAL (olddecl) != 0)
1776 warning_with_decl (newdecl,
1777 "`%s' declared inline after its definition");
1779 /* If pedantic, warn when static declaration follows a non-static
1780 declaration. Otherwise, do so only for functions. */
1781 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1782 && TREE_PUBLIC (olddecl)
1783 && !TREE_PUBLIC (newdecl))
1784 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1786 /* If warn_traditional, warn when a non-static function
1787 declaration follows a static one. */
1788 if (warn_traditional && !in_system_header
1789 && TREE_CODE (olddecl) == FUNCTION_DECL
1790 && !TREE_PUBLIC (olddecl)
1791 && TREE_PUBLIC (newdecl))
1792 warning_with_decl (newdecl, "non-static declaration for `%s' follows static");
1794 /* Warn when const declaration follows a non-const
1795 declaration, but not for functions. */
1796 if (TREE_CODE (olddecl) != FUNCTION_DECL
1797 && !TREE_READONLY (olddecl)
1798 && TREE_READONLY (newdecl))
1799 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1800 /* These bits are logically part of the type, for variables.
1801 But not for functions
1802 (where qualifiers are not valid ANSI anyway). */
1803 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1804 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1805 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1806 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1810 /* Optionally warn about more than one declaration for the same name. */
1811 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1812 /* Don't warn about a function declaration
1813 followed by a definition. */
1814 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1815 && DECL_INITIAL (olddecl) == 0)
1816 /* Don't warn about extern decl followed by (tentative) definition. */
1817 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1819 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1820 warning_with_decl (olddecl, "previous declaration of `%s'");
1823 /* Copy all the DECL_... slots specified in the new decl
1824 except for any that we copy here from the old type.
1826 Past this point, we don't change OLDTYPE and NEWTYPE
1827 even if we change the types of NEWDECL and OLDDECL. */
1831 /* When copying info to olddecl, we store into write_olddecl
1832 instead. This allows us to avoid modifying olddecl when
1833 different_binding_level is true. */
1834 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1836 /* Merge the data types specified in the two decls. */
1837 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1839 if (different_binding_level)
1841 = build_type_attribute_variant
1843 merge_attributes (TYPE_ATTRIBUTES (newtype),
1844 TYPE_ATTRIBUTES (oldtype)));
1847 = TREE_TYPE (olddecl)
1848 = common_type (newtype, oldtype);
1851 /* Lay the type out, unless already done. */
1852 if (oldtype != TREE_TYPE (newdecl))
1854 if (TREE_TYPE (newdecl) != error_mark_node)
1855 layout_type (TREE_TYPE (newdecl));
1856 if (TREE_CODE (newdecl) != FUNCTION_DECL
1857 && TREE_CODE (newdecl) != TYPE_DECL
1858 && TREE_CODE (newdecl) != CONST_DECL)
1859 layout_decl (newdecl, 0);
1863 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1864 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1865 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1866 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1867 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1868 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1870 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1871 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1875 /* Keep the old rtl since we can safely use it. */
1876 DECL_RTL (newdecl) = DECL_RTL (olddecl);
1878 /* Merge the type qualifiers. */
1879 if (TREE_CODE (olddecl) == FUNCTION_DECL
1880 && DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1881 && ! TREE_THIS_VOLATILE (newdecl))
1882 TREE_THIS_VOLATILE (write_olddecl) = 0;
1884 if (TREE_READONLY (newdecl))
1885 TREE_READONLY (write_olddecl) = 1;
1887 if (TREE_THIS_VOLATILE (newdecl))
1889 TREE_THIS_VOLATILE (write_olddecl) = 1;
1890 if (TREE_CODE (newdecl) == VAR_DECL
1891 /* If an automatic variable is re-declared in the same
1892 function scope, but the old declaration was not
1893 volatile, make_var_volatile() would crash because the
1894 variable would have been assigned to a pseudo, not a
1895 MEM. Since this duplicate declaration is invalid
1896 anyway, we just skip the call. */
1898 make_var_volatile (newdecl);
1901 /* Keep source location of definition rather than declaration. */
1902 /* When called with different_binding_level set, keep the old
1903 information so that meaningful diagnostics can be given. */
1904 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1905 && ! different_binding_level)
1907 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1908 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1911 /* Merge the unused-warning information. */
1912 if (DECL_IN_SYSTEM_HEADER (olddecl))
1913 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1914 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1915 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1917 /* Merge the initialization information. */
1918 /* When called with different_binding_level set, don't copy over
1919 DECL_INITIAL, so that we don't accidentally change function
1920 declarations into function definitions. */
1921 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1922 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1924 /* Merge the section attribute.
1925 We want to issue an error if the sections conflict but that must be
1926 done later in decl_attributes since we are called before attributes
1928 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1929 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1931 /* Copy the assembler name.
1932 Currently, it can only be defined in the prototype. */
1933 DECL_ASSEMBLER_NAME (newdecl) = DECL_ASSEMBLER_NAME (olddecl);
1935 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1937 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1938 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1940 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1941 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1942 DECL_NO_CHECK_MEMORY_USAGE (newdecl)
1943 |= DECL_NO_CHECK_MEMORY_USAGE (olddecl);
1944 DECL_NO_LIMIT_STACK (newdecl)
1945 |= DECL_NO_LIMIT_STACK (olddecl);
1948 /* If cannot merge, then use the new type and qualifiers,
1949 and don't preserve the old rtl. */
1950 else if (! different_binding_level)
1952 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1953 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1954 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1955 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1958 /* Merge the storage class information. */
1959 DECL_WEAK (newdecl) |= DECL_WEAK (olddecl);
1960 /* For functions, static overrides non-static. */
1961 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1963 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1964 /* This is since we don't automatically
1965 copy the attributes of NEWDECL into OLDDECL. */
1966 /* No need to worry about different_binding_level here because
1967 then TREE_PUBLIC (newdecl) was true. */
1968 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1969 /* If this clears `static', clear it in the identifier too. */
1970 if (! TREE_PUBLIC (olddecl))
1971 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1973 if (DECL_EXTERNAL (newdecl))
1975 if (! different_binding_level)
1977 /* Don't mess with these flags on local externs; they remain
1978 external even if there's a declaration at file scope which
1980 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1981 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1983 /* An extern decl does not override previous storage class. */
1984 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1985 if (! DECL_EXTERNAL (newdecl))
1986 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1990 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1991 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1994 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1996 /* If either decl says `inline', this fn is inline,
1997 unless its definition was passed already. */
1998 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
1999 DECL_INLINE (olddecl) = 1;
2001 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
2003 if (DECL_BUILT_IN (olddecl))
2005 /* Get rid of any built-in function if new arg types don't match it
2006 or if we have a function definition. */
2007 if (! types_match || new_is_definition)
2009 if (! different_binding_level)
2011 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
2012 DECL_BUILT_IN_CLASS (olddecl) = NOT_BUILT_IN;
2017 /* If redeclaring a builtin function, and not a definition,
2018 it stays built in. */
2019 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2020 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2023 /* Also preserve various other info from the definition. */
2024 else if (! new_is_definition)
2025 DECL_FRAME_SIZE (newdecl) = DECL_FRAME_SIZE (olddecl);
2026 if (! new_is_definition)
2028 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2029 /* When called with different_binding_level set, don't copy over
2030 DECL_INITIAL, so that we don't accidentally change function
2031 declarations into function definitions. */
2032 if (! different_binding_level)
2033 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2034 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
2035 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2036 if (DECL_INLINE (newdecl))
2037 DECL_ABSTRACT_ORIGIN (newdecl) = DECL_ABSTRACT_ORIGIN (olddecl);
2040 if (different_binding_level)
2043 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2044 But preserve OLDDECL's DECL_UID. */
2046 register unsigned olddecl_uid = DECL_UID (olddecl);
2048 memcpy ((char *) olddecl + sizeof (struct tree_common),
2049 (char *) newdecl + sizeof (struct tree_common),
2050 sizeof (struct tree_decl) - sizeof (struct tree_common));
2051 DECL_UID (olddecl) = olddecl_uid;
2054 /* NEWDECL contains the merged attribute lists.
2055 Update OLDDECL to be the same. */
2056 DECL_MACHINE_ATTRIBUTES (olddecl) = DECL_MACHINE_ATTRIBUTES (newdecl);
2061 /* Record a decl-node X as belonging to the current lexical scope.
2062 Check for errors (such as an incompatible declaration for the same
2063 name already seen in the same scope).
2065 Returns either X or an old decl for the same name.
2066 If an old decl is returned, it may have been smashed
2067 to agree with what X says. */
2074 register tree name = DECL_NAME (x);
2075 register struct binding_level *b = current_binding_level;
2077 DECL_CONTEXT (x) = current_function_decl;
2078 /* A local extern declaration for a function doesn't constitute nesting.
2079 A local auto declaration does, since it's a forward decl
2080 for a nested function coming later. */
2081 if ((TREE_CODE (x) == FUNCTION_DECL || TREE_CODE (x) == VAR_DECL)
2082 && DECL_INITIAL (x) == 0 && DECL_EXTERNAL (x))
2083 DECL_CONTEXT (x) = 0;
2085 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
2086 && x != IDENTIFIER_IMPLICIT_DECL (name)
2087 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
2088 && !DECL_IN_SYSTEM_HEADER (x))
2089 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
2095 int different_binding_level = 0;
2097 t = lookup_name_current_level (name);
2098 /* Don't type check externs here when -traditional. This is so that
2099 code with conflicting declarations inside blocks will get warnings
2100 not errors. X11 for instance depends on this. */
2101 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
2103 t = IDENTIFIER_GLOBAL_VALUE (name);
2104 /* Type decls at global scope don't conflict with externs declared
2105 inside lexical blocks. */
2106 if (t && TREE_CODE (t) == TYPE_DECL)
2108 different_binding_level = 1;
2110 if (t != 0 && t == error_mark_node)
2111 /* error_mark_node is 0 for a while during initialization! */
2114 error_with_decl (x, "`%s' used prior to declaration");
2119 file = DECL_SOURCE_FILE (t);
2120 line = DECL_SOURCE_LINE (t);
2123 /* If this decl is `static' and an implicit decl was seen previously,
2124 warn. But don't complain if -traditional,
2125 since traditional compilers don't complain. */
2126 if (! flag_traditional && TREE_PUBLIC (name)
2127 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2128 sets this for all functions. */
2129 && ! TREE_PUBLIC (x)
2130 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2131 /* We used to warn also for explicit extern followed by static,
2132 but sometimes you need to do it that way. */
2133 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2135 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2136 IDENTIFIER_POINTER (name));
2137 pedwarn_with_file_and_line
2138 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2139 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2140 "previous declaration of `%s'",
2141 IDENTIFIER_POINTER (name));
2142 TREE_THIS_VOLATILE (name) = 1;
2145 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2147 if (TREE_CODE (t) == PARM_DECL)
2149 /* Don't allow more than one "real" duplicate
2150 of a forward parm decl. */
2151 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2157 /* If we are processing a typedef statement, generate a whole new
2158 ..._TYPE node (which will be just an variant of the existing
2159 ..._TYPE node with identical properties) and then install the
2160 TYPE_DECL node generated to represent the typedef name as the
2161 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2163 The whole point here is to end up with a situation where each
2164 and every ..._TYPE node the compiler creates will be uniquely
2165 associated with AT MOST one node representing a typedef name.
2166 This way, even though the compiler substitutes corresponding
2167 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2168 early on, later parts of the compiler can always do the reverse
2169 translation and get back the corresponding typedef name. For
2172 typedef struct S MY_TYPE;
2175 Later parts of the compiler might only know that `object' was of
2176 type `struct S' if it were not for code just below. With this
2177 code however, later parts of the compiler see something like:
2179 struct S' == struct S
2180 typedef struct S' MY_TYPE;
2183 And they can then deduce (from the node for type struct S') that
2184 the original object declaration was:
2188 Being able to do this is important for proper support of protoize,
2189 and also for generating precise symbolic debugging information
2190 which takes full account of the programmer's (typedef) vocabulary.
2192 Obviously, we don't want to generate a duplicate ..._TYPE node if
2193 the TYPE_DECL node that we are now processing really represents a
2194 standard built-in type.
2196 Since all standard types are effectively declared at line zero
2197 in the source file, we can easily check to see if we are working
2198 on a standard type by checking the current value of lineno. */
2200 if (TREE_CODE (x) == TYPE_DECL)
2202 if (DECL_SOURCE_LINE (x) == 0)
2204 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2205 TYPE_NAME (TREE_TYPE (x)) = x;
2207 else if (TREE_TYPE (x) != error_mark_node
2208 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2210 tree tt = TREE_TYPE (x);
2211 DECL_ORIGINAL_TYPE (x) = tt;
2212 tt = build_type_copy (tt);
2214 TREE_USED (tt) = TREE_USED (x);
2219 /* Multiple external decls of the same identifier ought to match.
2220 Check against both global declarations (when traditional) and out of
2221 scope (limbo) block level declarations.
2223 We get warnings about inline functions where they are defined.
2224 Avoid duplicate warnings where they are used. */
2226 && ! (TREE_CODE (x) == FUNCTION_DECL && DECL_INLINE (x)))
2230 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2231 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2232 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2233 decl = IDENTIFIER_GLOBAL_VALUE (name);
2234 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2235 /* Decls in limbo are always extern, so no need to check that. */
2236 decl = IDENTIFIER_LIMBO_VALUE (name);
2240 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2241 /* If old decl is built-in, we already warned if we should. */
2242 && !DECL_BUILT_IN (decl))
2244 pedwarn_with_decl (x,
2245 "type mismatch with previous external decl");
2246 pedwarn_with_decl (decl, "previous external decl of `%s'");
2250 /* If a function has had an implicit declaration, and then is defined,
2251 make sure they are compatible. */
2253 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2254 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2255 && TREE_CODE (x) == FUNCTION_DECL
2256 && ! comptypes (TREE_TYPE (x),
2257 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2259 warning_with_decl (x, "type mismatch with previous implicit declaration");
2260 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2261 "previous implicit declaration of `%s'");
2264 /* In PCC-compatibility mode, extern decls of vars with no current decl
2265 take effect at top level no matter where they are. */
2266 if (flag_traditional && DECL_EXTERNAL (x)
2267 && lookup_name (name) == 0)
2269 tree type = TREE_TYPE (x);
2271 /* But don't do this if the type contains temporary nodes. */
2274 if (type == error_mark_node)
2276 if (TYPE_CONTEXT (type))
2278 warning_with_decl (x, "type of external `%s' is not global");
2279 /* By exiting the loop early, we leave TYPE nonzero,
2280 and thus prevent globalization of the decl. */
2283 else if (TREE_CODE (type) == FUNCTION_TYPE
2284 && TYPE_ARG_TYPES (type) != 0)
2285 /* The types might not be truly local,
2286 but the list of arg types certainly is temporary.
2287 Since prototypes are nontraditional,
2288 ok not to do the traditional thing. */
2290 type = TREE_TYPE (type);
2294 b = global_binding_level;
2297 /* This name is new in its binding level.
2298 Install the new declaration and return it. */
2299 if (b == global_binding_level)
2301 /* Install a global value. */
2303 /* If the first global decl has external linkage,
2304 warn if we later see static one. */
2305 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2306 TREE_PUBLIC (name) = 1;
2308 IDENTIFIER_GLOBAL_VALUE (name) = x;
2310 /* We no longer care about any previous block level declarations. */
2311 IDENTIFIER_LIMBO_VALUE (name) = 0;
2313 /* Don't forget if the function was used via an implicit decl. */
2314 if (IDENTIFIER_IMPLICIT_DECL (name)
2315 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2316 TREE_USED (x) = 1, TREE_USED (name) = 1;
2318 /* Don't forget if its address was taken in that way. */
2319 if (IDENTIFIER_IMPLICIT_DECL (name)
2320 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2321 TREE_ADDRESSABLE (x) = 1;
2323 /* Warn about mismatches against previous implicit decl. */
2324 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2325 /* If this real decl matches the implicit, don't complain. */
2326 && ! (TREE_CODE (x) == FUNCTION_DECL
2327 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2328 == integer_type_node)))
2329 pedwarn ("`%s' was previously implicitly declared to return `int'",
2330 IDENTIFIER_POINTER (name));
2332 /* If this decl is `static' and an `extern' was seen previously,
2333 that is erroneous. */
2334 if (TREE_PUBLIC (name)
2335 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2337 /* Okay to redeclare an ANSI built-in as static. */
2338 if (t != 0 && DECL_BUILT_IN (t))
2340 /* Okay to declare a non-ANSI built-in as anything. */
2341 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2343 /* Okay to have global type decl after an earlier extern
2344 declaration inside a lexical block. */
2345 else if (TREE_CODE (x) == TYPE_DECL)
2347 else if (IDENTIFIER_IMPLICIT_DECL (name))
2349 if (! TREE_THIS_VOLATILE (name))
2350 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2351 IDENTIFIER_POINTER (name));
2354 pedwarn ("`%s' was declared `extern' and later `static'",
2355 IDENTIFIER_POINTER (name));
2360 /* Here to install a non-global value. */
2361 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2362 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2364 IDENTIFIER_LOCAL_VALUE (name) = x;
2366 /* If this is an extern function declaration, see if we
2367 have a global definition or declaration for the function. */
2370 && TREE_CODE (x) == FUNCTION_DECL
2371 && TREE_CODE (oldglobal) == FUNCTION_DECL
2372 && DECL_EXTERNAL (x) && ! DECL_INLINE (x))
2374 /* We have one. Their types must agree. */
2375 if (! comptypes (TREE_TYPE (x),
2376 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2377 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2380 /* Inner extern decl is inline if global one is.
2381 Copy enough to really inline it. */
2382 if (DECL_INLINE (oldglobal))
2384 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2385 DECL_INITIAL (x) = (current_function_decl == oldglobal
2386 ? 0 : DECL_INITIAL (oldglobal));
2387 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2388 DECL_FRAME_SIZE (x) = DECL_FRAME_SIZE (oldglobal);
2389 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2390 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2391 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2392 DECL_ABSTRACT_ORIGIN (x)
2393 = DECL_ABSTRACT_ORIGIN (oldglobal);
2395 /* Inner extern decl is built-in if global one is. */
2396 if (DECL_BUILT_IN (oldglobal))
2398 DECL_BUILT_IN_CLASS (x) = DECL_BUILT_IN_CLASS (oldglobal);
2399 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2401 /* Keep the arg types from a file-scope fcn defn. */
2402 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2403 && DECL_INITIAL (oldglobal)
2404 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2405 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2410 /* This case is probably sometimes the right thing to do. */
2411 /* If we have a local external declaration,
2412 then any file-scope declaration should not
2413 have been static. */
2414 if (oldlocal == 0 && oldglobal != 0
2415 && !TREE_PUBLIC (oldglobal)
2416 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2417 warning ("`%s' locally external but globally static",
2418 IDENTIFIER_POINTER (name));
2421 /* If we have a local external declaration,
2422 and no file-scope declaration has yet been seen,
2423 then if we later have a file-scope decl it must not be static. */
2425 && DECL_EXTERNAL (x)
2429 TREE_PUBLIC (name) = 1;
2431 /* Save this decl, so that we can do type checking against
2432 other decls after it falls out of scope.
2434 Only save it once. This prevents temporary decls created in
2435 expand_inline_function from being used here, since this
2436 will have been set when the inline function was parsed.
2437 It also helps give slightly better warnings. */
2438 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2439 IDENTIFIER_LIMBO_VALUE (name) = x;
2442 /* Warn if shadowing an argument at the top level of the body. */
2443 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2444 /* This warning doesn't apply to the parms of a nested fcn. */
2445 && ! current_binding_level->parm_flag
2446 /* Check that this is one level down from the parms. */
2447 && current_binding_level->level_chain->parm_flag
2448 /* Check that the decl being shadowed
2449 comes from the parm level, one level up. */
2450 && chain_member (oldlocal, current_binding_level->level_chain->names))
2452 if (TREE_CODE (oldlocal) == PARM_DECL)
2453 pedwarn ("declaration of `%s' shadows a parameter",
2454 IDENTIFIER_POINTER (name));
2456 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2457 IDENTIFIER_POINTER (name));
2460 /* Maybe warn if shadowing something else. */
2461 else if (warn_shadow && !DECL_EXTERNAL (x)
2462 /* No shadow warnings for internally generated vars. */
2463 && DECL_SOURCE_LINE (x) != 0
2464 /* No shadow warnings for vars made for inlining. */
2465 && ! DECL_FROM_INLINE (x))
2467 const char *id = IDENTIFIER_POINTER (name);
2469 if (TREE_CODE (x) == PARM_DECL
2470 && current_binding_level->level_chain->parm_flag)
2471 /* Don't warn about the parm names in function declarator
2472 within a function declarator.
2473 It would be nice to avoid warning in any function
2474 declarator in a declaration, as opposed to a definition,
2475 but there is no way to tell it's not a definition. */
2477 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2478 warning ("declaration of `%s' shadows a parameter", id);
2479 else if (oldlocal != 0)
2480 warning ("declaration of `%s' shadows previous local", id);
2481 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2482 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2483 warning ("declaration of `%s' shadows global declaration", id);
2486 /* If storing a local value, there may already be one (inherited).
2487 If so, record it for restoration when this binding level ends. */
2489 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2492 /* Keep count of variables in this level with incomplete type.
2493 If the input is erroneous, we can have error_mark in the type
2494 slot (e.g. "f(void a, ...)") - that doesn't count as an
2496 if (TREE_TYPE (x) != error_mark_node
2497 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2501 /* Put decls on list in reverse order.
2502 We will reverse them later if necessary. */
2503 TREE_CHAIN (x) = b->names;
2509 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2512 pushdecl_top_level (x)
2516 register struct binding_level *b = current_binding_level;
2518 current_binding_level = global_binding_level;
2520 current_binding_level = b;
2524 /* Generate an implicit declaration for identifier FUNCTIONID
2525 as a function of type int (). Print a warning if appropriate. */
2528 implicitly_declare (functionid)
2532 int traditional_warning = 0;
2533 /* Only one "implicit declaration" warning per identifier. */
2534 int implicit_warning;
2536 /* We used to reuse an old implicit decl here,
2537 but this loses with inline functions because it can clobber
2538 the saved decl chains. */
2540 if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2541 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2544 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2546 /* Warn of implicit decl following explicit local extern decl.
2547 This is probably a program designed for traditional C. */
2548 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2549 traditional_warning = 1;
2551 /* Warn once of an implicit declaration. */
2552 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2554 DECL_EXTERNAL (decl) = 1;
2555 TREE_PUBLIC (decl) = 1;
2557 /* Record that we have an implicit decl and this is it. */
2558 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2560 /* ANSI standard says implicit declarations are in the innermost block.
2561 So we record the decl in the standard fashion.
2562 If flag_traditional is set, pushdecl does it top-level. */
2565 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2566 maybe_objc_check_decl (decl);
2568 rest_of_decl_compilation (decl, NULL_PTR, 0, 0);
2570 if (implicit_warning)
2571 implicit_decl_warning (functionid);
2572 else if (warn_traditional && traditional_warning)
2573 warning ("function `%s' was previously declared within a block",
2574 IDENTIFIER_POINTER (functionid));
2576 /* Write a record describing this implicit function declaration to the
2577 prototypes file (if requested). */
2579 gen_aux_info_record (decl, 0, 1, 0);
2585 implicit_decl_warning (id)
2588 const char *name = IDENTIFIER_POINTER (id);
2589 if (mesg_implicit_function_declaration == 2)
2590 error ("implicit declaration of function `%s'", name);
2591 else if (mesg_implicit_function_declaration == 1)
2592 warning ("implicit declaration of function `%s'", name);
2595 /* Return zero if the declaration NEWDECL is valid
2596 when the declaration OLDDECL (assumed to be for the same name)
2597 has already been seen.
2598 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
2599 and 3 if it is a conflicting declaration. */
2602 redeclaration_error_message (newdecl, olddecl)
2603 tree newdecl, olddecl;
2605 if (TREE_CODE (newdecl) == TYPE_DECL)
2607 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2609 /* pushdecl creates distinct types for TYPE_DECLs by calling
2610 build_type_copy, so the above comparison generally fails. We do
2611 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2612 is equivalent to what this code used to do before the build_type_copy
2613 call. The variant type distinction should not matter for traditional
2614 code, because it doesn't have type qualifiers. */
2615 if (flag_traditional
2616 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
2618 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2622 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2624 /* Declarations of functions can insist on internal linkage
2625 but they can't be inconsistent with internal linkage,
2626 so there can be no error on that account.
2627 However defining the same name twice is no good. */
2628 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2629 /* However, defining once as extern inline and a second
2630 time in another way is ok. */
2631 && ! (DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2632 && ! (DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2636 else if (DECL_CONTEXT (newdecl) == NULL_TREE)
2638 /* Objects declared at top level: */
2639 /* If at least one is a reference, it's ok. */
2640 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2642 /* Reject two definitions. */
2643 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2645 /* Now we have two tentative defs, or one tentative and one real def. */
2646 /* Insist that the linkage match. */
2647 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2651 else if (current_binding_level->parm_flag
2652 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2656 /* Newdecl has block scope. If olddecl has block scope also, then
2657 reject two definitions, and reject a definition together with an
2658 external reference. Otherwise, it is OK, because newdecl must
2659 be an extern reference to olddecl. */
2660 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2661 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2667 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2668 Create one if none exists so far for the current function.
2669 This function is called for both label definitions and label references. */
2675 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2677 if (current_function_decl == 0)
2679 error ("label %s referenced outside of any function",
2680 IDENTIFIER_POINTER (id));
2684 /* Use a label already defined or ref'd with this name. */
2687 /* But not if it is inherited and wasn't declared to be inheritable. */
2688 if (DECL_CONTEXT (decl) != current_function_decl
2689 && ! C_DECLARED_LABEL_FLAG (decl))
2690 return shadow_label (id);
2694 decl = build_decl (LABEL_DECL, id, void_type_node);
2696 /* A label not explicitly declared must be local to where it's ref'd. */
2697 DECL_CONTEXT (decl) = current_function_decl;
2699 DECL_MODE (decl) = VOIDmode;
2701 /* Say where one reference is to the label,
2702 for the sake of the error if it is not defined. */
2703 DECL_SOURCE_LINE (decl) = lineno;
2704 DECL_SOURCE_FILE (decl) = input_filename;
2706 IDENTIFIER_LABEL_VALUE (id) = decl;
2708 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2713 /* Make a label named NAME in the current function,
2714 shadowing silently any that may be inherited from containing functions
2715 or containing scopes.
2717 Note that valid use, if the label being shadowed
2718 comes from another scope in the same function,
2719 requires calling declare_nonlocal_label right away. */
2725 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2731 /* Check to make sure that the label hasn't already been declared
2732 at this label scope */
2733 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2734 if (TREE_VALUE (dup) == decl)
2736 error ("duplicate label declaration `%s'",
2737 IDENTIFIER_POINTER (name));
2738 error_with_decl (TREE_VALUE (dup),
2739 "this is a previous declaration");
2740 /* Just use the previous declaration. */
2741 return lookup_label (name);
2744 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2745 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2748 return lookup_label (name);
2751 /* Define a label, specifying the location in the source file.
2752 Return the LABEL_DECL node for the label, if the definition is valid.
2753 Otherwise return 0. */
2756 define_label (filename, line, name)
2757 const char *filename;
2761 tree decl = lookup_label (name);
2763 /* If label with this name is known from an outer context, shadow it. */
2764 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2766 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2767 IDENTIFIER_LABEL_VALUE (name) = 0;
2768 decl = lookup_label (name);
2771 if (warn_traditional && !in_system_header && lookup_name (name))
2772 warning_with_file_and_line (filename, line,
2773 "traditional C lacks a separate namespace for labels, identifier `%s' conflicts",
2774 IDENTIFIER_POINTER (name));
2776 if (DECL_INITIAL (decl) != 0)
2778 error_with_file_and_line (filename, line, "duplicate label `%s'",
2779 IDENTIFIER_POINTER (name));
2784 /* Mark label as having been defined. */
2785 DECL_INITIAL (decl) = error_mark_node;
2786 /* Say where in the source. */
2787 DECL_SOURCE_FILE (decl) = filename;
2788 DECL_SOURCE_LINE (decl) = line;
2793 /* Return the list of declarations of the current level.
2794 Note that this list is in reverse order unless/until
2795 you nreverse it; and when you do nreverse it, you must
2796 store the result back using `storedecls' or you will lose. */
2801 return current_binding_level->names;
2804 /* Return the list of type-tags (for structs, etc) of the current level. */
2809 return current_binding_level->tags;
2812 /* Store the list of declarations of the current level.
2813 This is done for the parameter declarations of a function being defined,
2814 after they are modified in the light of any missing parameters. */
2820 current_binding_level->names = decls;
2823 /* Similarly, store the list of tags of the current level. */
2829 current_binding_level->tags = tags;
2832 /* Given NAME, an IDENTIFIER_NODE,
2833 return the structure (or union or enum) definition for that name.
2834 Searches binding levels from BINDING_LEVEL up to the global level.
2835 If THISLEVEL_ONLY is nonzero, searches only the specified context
2836 (but skips any tag-transparent contexts to find one that is
2837 meaningful for tags).
2838 CODE says which kind of type the caller wants;
2839 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2840 If the wrong kind of type is found, an error is reported. */
2843 lookup_tag (code, name, binding_level, thislevel_only)
2844 enum tree_code code;
2845 struct binding_level *binding_level;
2849 register struct binding_level *level;
2851 for (level = binding_level; level; level = level->level_chain)
2854 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2856 if (TREE_PURPOSE (tail) == name)
2858 if (TREE_CODE (TREE_VALUE (tail)) != code)
2860 /* Definition isn't the kind we were looking for. */
2861 pending_invalid_xref = name;
2862 pending_invalid_xref_file = input_filename;
2863 pending_invalid_xref_line = lineno;
2865 return TREE_VALUE (tail);
2868 if (thislevel_only && ! level->tag_transparent)
2874 /* Print an error message now
2875 for a recent invalid struct, union or enum cross reference.
2876 We don't print them immediately because they are not invalid
2877 when used in the `struct foo;' construct for shadowing. */
2880 pending_xref_error ()
2882 if (pending_invalid_xref != 0)
2883 error_with_file_and_line (pending_invalid_xref_file,
2884 pending_invalid_xref_line,
2885 "`%s' defined as wrong kind of tag",
2886 IDENTIFIER_POINTER (pending_invalid_xref));
2887 pending_invalid_xref = 0;
2890 /* Given a type, find the tag that was defined for it and return the tag name.
2891 Otherwise return 0. */
2894 lookup_tag_reverse (type)
2897 register struct binding_level *level;
2899 for (level = current_binding_level; level; level = level->level_chain)
2902 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2904 if (TREE_VALUE (tail) == type)
2905 return TREE_PURPOSE (tail);
2911 /* Look up NAME in the current binding level and its superiors
2912 in the namespace of variables, functions and typedefs.
2913 Return a ..._DECL node of some kind representing its definition,
2914 or return 0 if it is undefined. */
2922 if (current_binding_level != global_binding_level
2923 && IDENTIFIER_LOCAL_VALUE (name))
2924 val = IDENTIFIER_LOCAL_VALUE (name);
2926 val = IDENTIFIER_GLOBAL_VALUE (name);
2930 /* Similar to `lookup_name' but look only at current binding level. */
2933 lookup_name_current_level (name)
2938 if (current_binding_level == global_binding_level)
2939 return IDENTIFIER_GLOBAL_VALUE (name);
2941 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2944 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2945 if (DECL_NAME (t) == name)
2951 /* Mark ARG for GC. */
2954 mark_binding_level (arg)
2957 struct binding_level *level = *(struct binding_level **) arg;
2959 for (; level != 0; level = level->level_chain)
2961 ggc_mark_tree (level->names);
2962 ggc_mark_tree (level->tags);
2963 ggc_mark_tree (level->shadowed);
2964 ggc_mark_tree (level->blocks);
2965 ggc_mark_tree (level->this_block);
2966 ggc_mark_tree (level->parm_order);
2970 /* Create the predefined scalar types of C,
2971 and some nodes representing standard constants (0, 1, (void *) 0).
2972 Initialize the global binding level.
2973 Make definitions for built-in primitive functions. */
2976 init_decl_processing ()
2978 register tree endlink;
2979 tree ptr_ftype_void, ptr_ftype_ptr;
2980 int wchar_type_size;
2981 tree array_domain_type;
2984 current_function_decl = NULL;
2985 named_labels = NULL;
2986 current_binding_level = NULL_BINDING_LEVEL;
2987 free_binding_level = NULL_BINDING_LEVEL;
2989 /* Make the binding_level structure for global names. */
2991 global_binding_level = current_binding_level;
2993 build_common_tree_nodes (flag_signed_char);
2995 /* Define `int' and `char' first so that dbx will output them first. */
2996 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_INT],
2997 integer_type_node));
2998 pushdecl (build_decl (TYPE_DECL, get_identifier ("char"),
3000 pushdecl (build_decl (TYPE_DECL, get_identifier ("long int"),
3001 long_integer_type_node));
3002 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned int"),
3003 unsigned_type_node));
3004 pushdecl (build_decl (TYPE_DECL, get_identifier ("long unsigned int"),
3005 long_unsigned_type_node));
3006 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long int"),
3007 long_long_integer_type_node));
3008 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long unsigned int"),
3009 long_long_unsigned_type_node));
3010 pushdecl (build_decl (TYPE_DECL, get_identifier ("short int"),
3011 short_integer_type_node));
3012 pushdecl (build_decl (TYPE_DECL, get_identifier ("short unsigned int"),
3013 short_unsigned_type_node));
3014 pushdecl (build_decl (TYPE_DECL, get_identifier ("signed char"),
3015 signed_char_type_node));
3016 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned char"),
3017 unsigned_char_type_node));
3018 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intQI_type_node));
3019 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intHI_type_node));
3020 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intSI_type_node));
3021 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
3022 #if HOST_BITS_PER_WIDE_INT >= 64
3023 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intTI_type_node));
3025 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node));
3026 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intHI_type_node));
3027 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intSI_type_node));
3028 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node));
3029 #if HOST_BITS_PER_WIDE_INT >= 64
3030 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intTI_type_node));
3033 /* `unsigned long' is the standard type for sizeof.
3034 Traditionally, use a signed type.
3035 Note that stddef.h uses `unsigned long',
3036 and this must agree, even if long and int are the same size. */
3037 t = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE)));
3038 signed_size_type_node = signed_type (t);
3039 if (flag_traditional && TREE_UNSIGNED (t))
3040 t = signed_type (t);
3042 c_size_type_node = t;
3045 /* Create the widest literal types. */
3046 widest_integer_literal_type_node
3047 = make_signed_type (HOST_BITS_PER_WIDE_INT * 2);
3048 widest_unsigned_literal_type_node
3049 = make_unsigned_type (HOST_BITS_PER_WIDE_INT * 2);
3050 pushdecl (build_decl (TYPE_DECL, NULL_TREE,
3051 widest_integer_literal_type_node));
3052 pushdecl (build_decl (TYPE_DECL, NULL_TREE,
3053 widest_unsigned_literal_type_node));
3055 build_common_tree_nodes_2 (flag_short_double);
3057 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_FLOAT],
3059 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_DOUBLE],
3061 pushdecl (build_decl (TYPE_DECL, get_identifier ("long double"),
3062 long_double_type_node));
3063 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex int"),
3064 complex_integer_type_node));
3065 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex float"),
3066 complex_float_type_node));
3067 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex double"),
3068 complex_double_type_node));
3069 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex long double"),
3070 complex_long_double_type_node));
3071 pushdecl (build_decl (TYPE_DECL,
3072 ridpointers[(int) RID_VOID], void_type_node));
3074 #ifdef MD_INIT_BUILTINS
3078 wchar_type_node = get_identifier (flag_short_wchar
3079 ? "short unsigned int"
3081 wchar_type_node = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (wchar_type_node));
3082 wchar_type_size = TYPE_PRECISION (wchar_type_node);
3083 signed_wchar_type_node = signed_type (wchar_type_node);
3084 unsigned_wchar_type_node = unsigned_type (wchar_type_node);
3087 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (WINT_TYPE)));
3090 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (INTMAX_TYPE)));
3092 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (UINTMAX_TYPE)));
3094 boolean_type_node = integer_type_node;
3095 boolean_true_node = integer_one_node;
3096 boolean_false_node = integer_zero_node;
3098 /* With GCC, C99's _Bool is always of size 1. */
3099 c_bool_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
3100 TREE_SET_CODE (c_bool_type_node, BOOLEAN_TYPE);
3101 TYPE_MAX_VALUE (c_bool_type_node) = build_int_2 (1, 0);
3102 TREE_TYPE (TYPE_MAX_VALUE (c_bool_type_node)) = c_bool_type_node;
3103 TYPE_PRECISION (c_bool_type_node) = 1;
3104 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
3106 c_bool_false_node = build_int_2 (0, 0);
3107 TREE_TYPE (c_bool_false_node) = c_bool_type_node;
3108 c_bool_true_node = build_int_2 (1, 0);
3109 TREE_TYPE (c_bool_true_node) = c_bool_type_node;
3111 string_type_node = build_pointer_type (char_type_node);
3112 const_string_type_node
3113 = build_pointer_type (build_type_variant (char_type_node, 1, 0));
3115 /* Make a type to be the domain of a few array types
3116 whose domains don't really matter.
3117 200 is small enough that it always fits in size_t
3118 and large enough that it can hold most function names for the
3119 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
3120 array_domain_type = build_index_type (build_int_2 (200, 0));
3122 /* make a type for arrays of characters.
3123 With luck nothing will ever really depend on the length of this
3125 char_array_type_node = build_array_type (char_type_node, array_domain_type);
3127 /* Likewise for arrays of ints. */
3129 = build_array_type (integer_type_node, array_domain_type);
3131 /* This is for wide string constants. */
3132 wchar_array_type_node
3133 = build_array_type (wchar_type_node, array_domain_type);
3135 void_list_node = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
3137 default_function_type = build_function_type (integer_type_node, NULL_TREE);
3139 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE)));
3140 unsigned_ptrdiff_type_node = unsigned_type (ptrdiff_type_node);
3142 c_common_nodes_and_builtins ();
3144 endlink = void_list_node;
3145 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
3147 = build_function_type (ptr_type_node,
3148 tree_cons (NULL_TREE, ptr_type_node, endlink));
3150 /* Types which are common to the fortran compiler and libf2c. When
3151 changing these, you also need to be concerned with f/com.h. */
3153 if (TYPE_PRECISION (float_type_node)
3154 == TYPE_PRECISION (long_integer_type_node))
3156 g77_integer_type_node = long_integer_type_node;
3157 g77_uinteger_type_node = long_unsigned_type_node;
3159 else if (TYPE_PRECISION (float_type_node)
3160 == TYPE_PRECISION (integer_type_node))
3162 g77_integer_type_node = integer_type_node;
3163 g77_uinteger_type_node = unsigned_type_node;
3166 g77_integer_type_node = g77_uinteger_type_node = NULL_TREE;
3168 if (g77_integer_type_node != NULL_TREE)
3170 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_integer"),
3171 g77_integer_type_node));
3172 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_uinteger"),
3173 g77_uinteger_type_node));
3176 if (TYPE_PRECISION (float_type_node) * 2
3177 == TYPE_PRECISION (long_integer_type_node))
3179 g77_longint_type_node = long_integer_type_node;
3180 g77_ulongint_type_node = long_unsigned_type_node;
3182 else if (TYPE_PRECISION (float_type_node) * 2
3183 == TYPE_PRECISION (long_long_integer_type_node))
3185 g77_longint_type_node = long_long_integer_type_node;
3186 g77_ulongint_type_node = long_long_unsigned_type_node;
3189 g77_longint_type_node = g77_ulongint_type_node = NULL_TREE;
3191 if (g77_longint_type_node != NULL_TREE)
3193 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_longint"),
3194 g77_longint_type_node));
3195 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_ulongint"),
3196 g77_ulongint_type_node));
3199 builtin_function ("__builtin_aggregate_incoming_address",
3200 build_function_type (ptr_type_node, NULL_TREE),
3201 BUILT_IN_AGGREGATE_INCOMING_ADDRESS,
3202 BUILT_IN_NORMAL, NULL_PTR);
3204 /* Hooks for the DWARF 2 __throw routine. */
3205 builtin_function ("__builtin_unwind_init",
3206 build_function_type (void_type_node, endlink),
3207 BUILT_IN_UNWIND_INIT, BUILT_IN_NORMAL, NULL_PTR);
3208 builtin_function ("__builtin_dwarf_cfa", ptr_ftype_void,
3209 BUILT_IN_DWARF_CFA, BUILT_IN_NORMAL, NULL_PTR);
3210 builtin_function ("__builtin_dwarf_fp_regnum",
3211 build_function_type (unsigned_type_node, endlink),
3212 BUILT_IN_DWARF_FP_REGNUM, BUILT_IN_NORMAL, NULL_PTR);
3213 builtin_function ("__builtin_init_dwarf_reg_size_table", void_ftype_ptr,
3214 BUILT_IN_INIT_DWARF_REG_SIZES, BUILT_IN_NORMAL, NULL_PTR);
3215 builtin_function ("__builtin_frob_return_addr", ptr_ftype_ptr,
3216 BUILT_IN_FROB_RETURN_ADDR, BUILT_IN_NORMAL, NULL_PTR);
3217 builtin_function ("__builtin_extract_return_addr", ptr_ftype_ptr,
3218 BUILT_IN_EXTRACT_RETURN_ADDR, BUILT_IN_NORMAL, NULL_PTR);
3220 ("__builtin_eh_return",
3221 build_function_type (void_type_node,
3222 tree_cons (NULL_TREE, ptr_type_node,
3223 tree_cons (NULL_TREE,
3224 type_for_mode (ptr_mode, 0),
3225 tree_cons (NULL_TREE,
3228 BUILT_IN_EH_RETURN, BUILT_IN_NORMAL, NULL_PTR);
3230 pedantic_lvalues = pedantic;
3232 /* Create the global bindings for __FUNCTION__, __PRETTY_FUNCTION__,
3234 function_id_node = get_identifier ("__FUNCTION__");
3235 pretty_function_id_node = get_identifier ("__PRETTY_FUNCTION__");
3236 func_id_node = get_identifier ("__func__");
3237 make_fname_decl = c_make_fname_decl;
3238 declare_function_name ();
3240 start_identifier_warnings ();
3242 /* Prepare to check format strings against argument lists. */
3243 init_function_format_info ();
3245 incomplete_decl_finalize_hook = finish_incomplete_decl;
3247 /* Record our roots. */
3249 ggc_add_tree_root (c_global_trees, CTI_MAX);
3250 ggc_add_root (&c_stmt_tree, 1, sizeof c_stmt_tree, mark_stmt_tree);
3251 ggc_add_tree_root (&c_scope_stmt_stack, 1);
3252 ggc_add_tree_root (&named_labels, 1);
3253 ggc_add_tree_root (&shadowed_labels, 1);
3254 ggc_add_root (¤t_binding_level, 1, sizeof current_binding_level,
3255 mark_binding_level);
3256 ggc_add_root (&label_level_chain, 1, sizeof label_level_chain,
3257 mark_binding_level);
3258 ggc_add_tree_root (&static_ctors, 1);
3259 ggc_add_tree_root (&static_dtors, 1);
3262 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3263 decl, NAME is the initialization string and TYPE_DEP indicates whether
3264 NAME depended on the type of the function. As we don't yet implement
3265 delayed emission of static data, we mark the decl as emitted
3266 so it is not placed in the output. Anything using it must therefore pull
3267 out the STRING_CST initializer directly. This does mean that these names
3268 are string merging candidates, which is wrong for C99's __func__. FIXME. */
3271 c_make_fname_decl (id, name, type_dep)
3274 int type_dep ATTRIBUTE_UNUSED;
3276 tree decl, type, init;
3277 size_t length = strlen (name);
3279 type = build_array_type
3280 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
3281 build_index_type (build_int_2 (length, 0)));
3283 decl = build_decl (VAR_DECL, id, type);
3284 TREE_STATIC (decl) = 1;
3285 TREE_READONLY (decl) = 1;
3286 TREE_ASM_WRITTEN (decl) = 1;
3287 DECL_SOURCE_LINE (decl) = 0;
3288 DECL_ARTIFICIAL (decl) = 1;
3289 DECL_IN_SYSTEM_HEADER (decl) = 1;
3290 DECL_IGNORED_P (decl) = 1;
3291 init = build_string (length + 1, name);
3292 TREE_TYPE (init) = type;
3293 DECL_INITIAL (decl) = init;
3294 finish_decl (pushdecl (decl), init, NULL_TREE);
3299 /* Return a definition for a builtin function named NAME and whose data type
3300 is TYPE. TYPE should be a function type with argument types.
3301 FUNCTION_CODE tells later passes how to compile calls to this function.
3302 See tree.h for its possible values.
3304 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3305 the name to be called if we can't opencode the function. */
3308 builtin_function (name, type, function_code, class, library_name)
3312 enum built_in_class class;
3313 const char *library_name;
3315 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3316 DECL_EXTERNAL (decl) = 1;
3317 TREE_PUBLIC (decl) = 1;
3318 /* If -traditional, permit redefining a builtin function any way you like.
3319 (Though really, if the program redefines these functions,
3320 it probably won't work right unless compiled with -fno-builtin.) */
3321 if (flag_traditional && name[0] != '_')
3322 DECL_BUILT_IN_NONANSI (decl) = 1;
3324 DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
3325 make_decl_rtl (decl, NULL_PTR, 1);
3327 DECL_BUILT_IN_CLASS (decl) = class;
3328 DECL_FUNCTION_CODE (decl) = function_code;
3330 /* Warn if a function in the namespace for users
3331 is used without an occasion to consider it declared. */
3332 if (name[0] != '_' || name[1] != '_')
3333 C_DECL_ANTICIPATED (decl) = 1;
3338 /* Called when a declaration is seen that contains no names to declare.
3339 If its type is a reference to a structure, union or enum inherited
3340 from a containing scope, shadow that tag name for the current scope
3341 with a forward reference.
3342 If its type defines a new named structure or union
3343 or defines an enum, it is valid but we need not do anything here.
3344 Otherwise, it is an error. */
3347 shadow_tag (declspecs)
3350 shadow_tag_warned (declspecs, 0);
3354 shadow_tag_warned (declspecs, warned)
3357 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3364 pending_invalid_xref = 0;
3366 /* Remove the attributes from declspecs, since they will confuse the
3368 split_specs_attrs (declspecs, &specs, &attrs);
3370 for (link = specs; link; link = TREE_CHAIN (link))
3372 register tree value = TREE_VALUE (link);
3373 register enum tree_code code = TREE_CODE (value);
3375 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3376 /* Used to test also that TYPE_SIZE (value) != 0.
3377 That caused warning for `struct foo;' at top level in the file. */
3379 register tree name = lookup_tag_reverse (value);
3386 if (warned != 1 && code != ENUMERAL_TYPE)
3387 /* Empty unnamed enum OK */
3389 pedwarn ("unnamed struct/union that defines no instances");
3395 t = lookup_tag (code, name, current_binding_level, 1);
3399 t = make_node (code);
3406 if (!warned && ! in_system_header)
3408 warning ("useless keyword or type name in empty declaration");
3415 error ("two types specified in one empty declaration");
3420 pedwarn ("empty declaration");
3424 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3427 groktypename (typename)
3430 if (TREE_CODE (typename) != TREE_LIST)
3432 return grokdeclarator (TREE_VALUE (typename),
3433 TREE_PURPOSE (typename),
3437 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3440 groktypename_in_parm_context (typename)
3443 if (TREE_CODE (typename) != TREE_LIST)
3445 return grokdeclarator (TREE_VALUE (typename),
3446 TREE_PURPOSE (typename),
3450 /* Decode a declarator in an ordinary declaration or data definition.
3451 This is called as soon as the type information and variable name
3452 have been parsed, before parsing the initializer if any.
3453 Here we create the ..._DECL node, fill in its type,
3454 and put it on the list of decls for the current context.
3455 The ..._DECL node is returned as the value.
3457 Exception: for arrays where the length is not specified,
3458 the type is left null, to be filled in by `finish_decl'.
3460 Function definitions do not come here; they go to start_function
3461 instead. However, external and forward declarations of functions
3462 do go through here. Structure field declarations are done by
3463 grokfield and not through here. */
3466 start_decl (declarator, declspecs, initialized, attributes, prefix_attributes)
3467 tree declarator, declspecs;
3469 tree attributes, prefix_attributes;
3471 register tree decl = grokdeclarator (declarator, declspecs,
3472 NORMAL, initialized);
3475 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3476 && MAIN_NAME_P (DECL_NAME (decl)))
3477 warning_with_decl (decl, "`%s' is usually a function");
3480 /* Is it valid for this decl to have an initializer at all?
3481 If not, set INITIALIZED to zero, which will indirectly
3482 tell `finish_decl' to ignore the initializer once it is parsed. */
3483 switch (TREE_CODE (decl))
3486 /* typedef foo = bar means give foo the same type as bar.
3487 We haven't parsed bar yet, so `finish_decl' will fix that up.
3488 Any other case of an initialization in a TYPE_DECL is an error. */
3489 if (pedantic || list_length (declspecs) > 1)
3491 error ("typedef `%s' is initialized",
3492 IDENTIFIER_POINTER (DECL_NAME (decl)));
3498 error ("function `%s' is initialized like a variable",
3499 IDENTIFIER_POINTER (DECL_NAME (decl)));
3504 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3505 error ("parameter `%s' is initialized",
3506 IDENTIFIER_POINTER (DECL_NAME (decl)));
3511 /* Don't allow initializations for incomplete types
3512 except for arrays which might be completed by the initialization. */
3514 /* This can happen if the array size is an undefined macro. We already
3515 gave a warning, so we don't need another one. */
3516 if (TREE_TYPE (decl) == error_mark_node)
3518 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3520 /* A complete type is ok if size is fixed. */
3522 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3523 || C_DECL_VARIABLE_SIZE (decl))
3525 error ("variable-sized object may not be initialized");
3529 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3531 error ("variable `%s' has initializer but incomplete type",
3532 IDENTIFIER_POINTER (DECL_NAME (decl)));
3535 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
3537 error ("elements of array `%s' have incomplete type",
3538 IDENTIFIER_POINTER (DECL_NAME (decl)));
3546 /* Seems redundant with grokdeclarator. */
3547 if (current_binding_level != global_binding_level
3548 && DECL_EXTERNAL (decl)
3549 && TREE_CODE (decl) != FUNCTION_DECL)
3550 warning ("declaration of `%s' has `extern' and is initialized",
3551 IDENTIFIER_POINTER (DECL_NAME (decl)));
3553 DECL_EXTERNAL (decl) = 0;
3554 if (current_binding_level == global_binding_level)
3555 TREE_STATIC (decl) = 1;
3557 /* Tell `pushdecl' this is an initialized decl
3558 even though we don't yet have the initializer expression.
3559 Also tell `finish_decl' it may store the real initializer. */
3560 DECL_INITIAL (decl) = error_mark_node;
3563 /* If this is a function declaration, write a record describing it to the
3564 prototypes file (if requested). */
3566 if (TREE_CODE (decl) == FUNCTION_DECL)
3567 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3569 /* ANSI specifies that a tentative definition which is not merged with
3570 a non-tentative definition behaves exactly like a definition with an
3571 initializer equal to zero. (Section 3.7.2)
3572 -fno-common gives strict ANSI behavior. Usually you don't want it.
3573 This matters only for variables with external linkage. */
3574 if (! flag_no_common || ! TREE_PUBLIC (decl))
3575 DECL_COMMON (decl) = 1;
3577 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
3578 SET_DEFAULT_DECL_ATTRIBUTES (decl, attributes);
3581 /* Set attributes here so if duplicate decl, will have proper attributes. */
3582 decl_attributes (decl, attributes, prefix_attributes);
3584 /* Add this decl to the current binding level.
3585 TEM may equal DECL or it may be a previous decl of the same name. */
3586 tem = pushdecl (decl);
3588 /* For a local variable, define the RTL now. */
3589 if (current_binding_level != global_binding_level
3590 /* But not if this is a duplicate decl
3591 and we preserved the rtl from the previous one
3592 (which may or may not happen). */
3593 && DECL_RTL (tem) == 0
3594 && !DECL_CONTEXT (tem))
3596 if (TREE_TYPE (tem) != error_mark_node
3597 && COMPLETE_TYPE_P (TREE_TYPE (tem)))
3599 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3600 && DECL_INITIAL (tem) != 0)
3607 /* Finish processing of a declaration;
3608 install its initial value.
3609 If the length of an array type is not known before,
3610 it must be determined now, from the initial value, or it is an error. */
3613 finish_decl (decl, init, asmspec_tree)
3617 register tree type = TREE_TYPE (decl);
3618 int was_incomplete = (DECL_SIZE (decl) == 0);
3619 const char *asmspec = 0;
3621 /* If a name was specified, get the string. */
3623 asmspec = TREE_STRING_POINTER (asmspec_tree);
3625 /* If `start_decl' didn't like having an initialization, ignore it now. */
3627 if (init != 0 && DECL_INITIAL (decl) == 0)
3629 /* Don't crash if parm is initialized. */
3630 if (TREE_CODE (decl) == PARM_DECL)
3635 if (TREE_CODE (decl) != TYPE_DECL)
3636 store_init_value (decl, init);
3639 /* typedef foo = bar; store the type of bar as the type of foo. */
3640 TREE_TYPE (decl) = TREE_TYPE (init);
3641 DECL_INITIAL (decl) = init = 0;
3645 /* Deduce size of array from initialization, if not already known */
3647 if (TREE_CODE (type) == ARRAY_TYPE
3648 && TYPE_DOMAIN (type) == 0
3649 && TREE_CODE (decl) != TYPE_DECL)
3652 = (TREE_STATIC (decl)
3653 /* Even if pedantic, an external linkage array
3654 may have incomplete type at first. */
3655 ? pedantic && !TREE_PUBLIC (decl)
3656 : !DECL_EXTERNAL (decl));
3658 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3660 /* Get the completed type made by complete_array_type. */
3661 type = TREE_TYPE (decl);
3664 error_with_decl (decl, "initializer fails to determine size of `%s'");
3666 else if (failure == 2)
3669 error_with_decl (decl, "array size missing in `%s'");
3670 /* If a `static' var's size isn't known,
3671 make it extern as well as static, so it does not get
3673 If it is not `static', then do not mark extern;
3674 finish_incomplete_decl will give it a default size
3675 and it will get allocated. */
3676 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3677 DECL_EXTERNAL (decl) = 1;
3680 /* TYPE_MAX_VALUE is always one less than the number of elements
3681 in the array, because we start counting at zero. Therefore,
3682 warn only if the value is less than zero. */
3683 else if (pedantic && TYPE_DOMAIN (type) != 0
3684 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3685 error_with_decl (decl, "zero or negative size array `%s'");
3687 layout_decl (decl, 0);
3690 if (TREE_CODE (decl) == VAR_DECL)
3692 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
3693 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3694 layout_decl (decl, 0);
3696 if (DECL_SIZE (decl) == 0
3697 /* Don't give an error if we already gave one earlier. */
3698 && TREE_TYPE (decl) != error_mark_node
3699 && (TREE_STATIC (decl)
3701 /* A static variable with an incomplete type
3702 is an error if it is initialized.
3703 Also if it is not file scope.
3704 Otherwise, let it through, but if it is not `extern'
3705 then it may cause an error message later. */
3706 (DECL_INITIAL (decl) != 0
3707 || DECL_CONTEXT (decl) != 0)
3709 /* An automatic variable with an incomplete type
3711 !DECL_EXTERNAL (decl)))
3713 error_with_decl (decl, "storage size of `%s' isn't known");
3714 TREE_TYPE (decl) = error_mark_node;
3717 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3718 && DECL_SIZE (decl) != 0)
3720 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3721 constant_expression_warning (DECL_SIZE (decl));
3723 error_with_decl (decl, "storage size of `%s' isn't constant");
3726 if (TREE_USED (type))
3727 TREE_USED (decl) = 1;
3730 /* If this is a function and an assembler name is specified, it isn't
3731 builtin any more. Also reset DECL_RTL so we can give it its new
3733 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3735 DECL_BUILT_IN_CLASS (decl) = NOT_BUILT_IN;
3736 DECL_RTL (decl) = 0;
3737 DECL_ASSEMBLER_NAME (decl) = get_identifier (asmspec);
3740 /* Output the assembler code and/or RTL code for variables and functions,
3741 unless the type is an undefined structure or union.
3742 If not, it will get done when the type is completed. */
3744 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3746 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3747 maybe_objc_check_decl (decl);
3749 if (!DECL_CONTEXT (decl))
3750 rest_of_decl_compilation (decl, asmspec,
3751 (DECL_CONTEXT (decl) == 0
3752 || TREE_ASM_WRITTEN (decl)), 0);
3757 DECL_ASSEMBLER_NAME (decl) = get_identifier (asmspec);
3758 DECL_C_HARD_REGISTER (decl) = 1;
3760 add_decl_stmt (decl);
3763 if (DECL_CONTEXT (decl) != 0)
3765 /* Recompute the RTL of a local array now
3766 if it used to be an incomplete type. */
3768 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3770 /* If we used it already as memory, it must stay in memory. */
3771 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3772 /* If it's still incomplete now, no init will save it. */
3773 if (DECL_SIZE (decl) == 0)
3774 DECL_INITIAL (decl) = 0;
3779 if (TREE_CODE (decl) == TYPE_DECL)
3781 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3782 maybe_objc_check_decl (decl);
3783 rest_of_decl_compilation (decl, NULL_PTR, DECL_CONTEXT (decl) == 0, 0);
3786 /* At the end of a declaration, throw away any variable type sizes
3787 of types defined inside that declaration. There is no use
3788 computing them in the following function definition. */
3789 if (current_binding_level == global_binding_level)
3790 get_pending_sizes ();
3793 /* If DECL has a cleanup, build and return that cleanup here.
3794 This is a callback called by expand_expr. */
3797 maybe_build_cleanup (decl)
3798 tree decl ATTRIBUTE_UNUSED;
3800 /* There are no cleanups in C. */
3804 /* Given a parsed parameter declaration,
3805 decode it into a PARM_DECL and push that on the current binding level.
3806 Also, for the sake of forward parm decls,
3807 record the given order of parms in `parm_order'. */
3810 push_parm_decl (parm)
3814 int old_immediate_size_expand = immediate_size_expand;
3815 /* Don't try computing parm sizes now -- wait till fn is called. */
3816 immediate_size_expand = 0;
3818 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3819 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3820 decl_attributes (decl, TREE_VALUE (TREE_VALUE (parm)),
3821 TREE_PURPOSE (TREE_VALUE (parm)));
3824 if (DECL_NAME (decl))
3827 olddecl = lookup_name (DECL_NAME (decl));
3828 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3829 pedwarn_with_decl (decl,
3830 "ANSI C forbids parameter `%s' shadowing typedef");
3834 decl = pushdecl (decl);
3836 immediate_size_expand = old_immediate_size_expand;
3838 current_binding_level->parm_order
3839 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3841 /* Add this decl to the current binding level. */
3842 finish_decl (decl, NULL_TREE, NULL_TREE);
3845 /* Clear the given order of parms in `parm_order'.
3846 Used at start of parm list,
3847 and also at semicolon terminating forward decls. */
3852 current_binding_level->parm_order = NULL_TREE;
3855 /* Make TYPE a complete type based on INITIAL_VALUE.
3856 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3857 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3860 complete_array_type (type, initial_value, do_default)
3865 register tree maxindex = NULL_TREE;
3870 /* Note MAXINDEX is really the maximum index,
3871 one less than the size. */
3872 if (TREE_CODE (initial_value) == STRING_CST)
3875 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3876 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3879 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3881 tree elts = CONSTRUCTOR_ELTS (initial_value);
3882 maxindex = build_int_2 (-1, -1);
3883 for (; elts; elts = TREE_CHAIN (elts))
3885 if (TREE_PURPOSE (elts))
3886 maxindex = TREE_PURPOSE (elts);
3888 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3889 maxindex, integer_one_node));
3891 maxindex = copy_node (maxindex);
3895 /* Make an error message unless that happened already. */
3896 if (initial_value != error_mark_node)
3899 /* Prevent further error messages. */
3900 maxindex = build_int_2 (0, 0);
3907 maxindex = build_int_2 (0, 0);
3913 TYPE_DOMAIN (type) = build_index_type (maxindex);
3914 if (!TREE_TYPE (maxindex))
3915 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3918 /* Lay out the type now that we can get the real answer. */
3925 /* Given declspecs and a declarator,
3926 determine the name and type of the object declared
3927 and construct a ..._DECL node for it.
3928 (In one case we can return a ..._TYPE node instead.
3929 For invalid input we sometimes return 0.)
3931 DECLSPECS is a chain of tree_list nodes whose value fields
3932 are the storage classes and type specifiers.
3934 DECL_CONTEXT says which syntactic context this declaration is in:
3935 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3936 FUNCDEF for a function definition. Like NORMAL but a few different
3937 error messages in each case. Return value may be zero meaning
3938 this definition is too screwy to try to parse.
3939 PARM for a parameter declaration (either within a function prototype
3940 or before a function body). Make a PARM_DECL, or return void_type_node.
3941 TYPENAME if for a typename (in a cast or sizeof).
3942 Don't make a DECL node; just return the ..._TYPE node.
3943 FIELD for a struct or union field; make a FIELD_DECL.
3944 BITFIELD for a field with specified width.
3945 INITIALIZED is 1 if the decl has an initializer.
3947 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3948 It may also be so in the PARM case, for a prototype where the
3949 argument type is specified but not the name.
3951 This function is where the complicated C meanings of `static'
3952 and `extern' are interpreted. */
3955 grokdeclarator (declarator, declspecs, decl_context, initialized)
3958 enum decl_context decl_context;
3963 tree type = NULL_TREE;
3968 int type_quals = TYPE_UNQUALIFIED;
3970 int explicit_int = 0;
3971 int explicit_char = 0;
3972 int defaulted_int = 0;
3973 tree typedef_decl = 0;
3975 tree typedef_type = 0;
3976 int funcdef_flag = 0;
3977 enum tree_code innermost_code = ERROR_MARK;
3979 int size_varies = 0;
3980 tree decl_machine_attr = NULL_TREE;
3982 if (decl_context == BITFIELD)
3983 bitfield = 1, decl_context = FIELD;
3985 if (decl_context == FUNCDEF)
3986 funcdef_flag = 1, decl_context = NORMAL;
3988 /* Look inside a declarator for the name being declared
3989 and get it as a string, for an error message. */
3991 register tree decl = declarator;
3995 switch (TREE_CODE (decl))
4000 innermost_code = TREE_CODE (decl);
4001 decl = TREE_OPERAND (decl, 0);
4004 case IDENTIFIER_NODE:
4005 name = IDENTIFIER_POINTER (decl);
4016 /* A function definition's declarator must have the form of
4017 a function declarator. */
4019 if (funcdef_flag && innermost_code != CALL_EXPR)
4022 /* Anything declared one level down from the top level
4023 must be one of the parameters of a function
4024 (because the body is at least two levels down). */
4026 /* If this looks like a function definition, make it one,
4027 even if it occurs where parms are expected.
4028 Then store_parm_decls will reject it and not use it as a parm. */
4029 if (decl_context == NORMAL && !funcdef_flag
4030 && current_binding_level->parm_flag)
4031 decl_context = PARM;
4033 /* Look through the decl specs and record which ones appear.
4034 Some typespecs are defined as built-in typenames.
4035 Others, the ones that are modifiers of other types,
4036 are represented by bits in SPECBITS: set the bits for
4037 the modifiers that appear. Storage class keywords are also in SPECBITS.
4039 If there is a typedef name or a type, store the type in TYPE.
4040 This includes builtin typedefs such as `int'.
4042 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
4043 and did not come from a user typedef.
4045 Set LONGLONG if `long' is mentioned twice. */
4047 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
4049 register tree id = TREE_VALUE (spec);
4051 if (id == ridpointers[(int) RID_INT])
4053 if (id == ridpointers[(int) RID_CHAR])
4056 if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
4058 enum rid i = C_RID_CODE (id);
4059 if (i <= RID_LAST_MODIFIER)
4061 if (i == RID_LONG && specbits & (1<<i))
4064 error ("`long long long' is too long for GCC");
4067 if (pedantic && !flag_isoc99 && ! in_system_header
4069 pedwarn ("ISO C89 does not support `long long'");
4073 else if (specbits & (1 << i))
4074 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
4080 error ("two or more data types in declaration of `%s'", name);
4081 /* Actual typedefs come to us as TYPE_DECL nodes. */
4082 else if (TREE_CODE (id) == TYPE_DECL)
4084 type = TREE_TYPE (id);
4085 decl_machine_attr = DECL_MACHINE_ATTRIBUTES (id);
4088 /* Built-in types come as identifiers. */
4089 else if (TREE_CODE (id) == IDENTIFIER_NODE)
4091 register tree t = lookup_name (id);
4092 if (TREE_TYPE (t) == error_mark_node)
4094 else if (!t || TREE_CODE (t) != TYPE_DECL)
4095 error ("`%s' fails to be a typedef or built in type",
4096 IDENTIFIER_POINTER (id));
4099 type = TREE_TYPE (t);
4103 else if (TREE_CODE (id) != ERROR_MARK)
4110 typedef_type = type;
4112 size_varies = C_TYPE_VARIABLE_SIZE (type);
4114 /* No type at all: default to `int', and set DEFAULTED_INT
4115 because it was not a user-defined typedef. */
4119 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4120 | (1 << (int) RID_SIGNED)
4121 | (1 << (int) RID_UNSIGNED)
4122 | (1 << (int) RID_COMPLEX))))
4123 /* Don't warn about typedef foo = bar. */
4124 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
4125 && ! in_system_header)
4127 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
4128 and this is a function, or if -Wimplicit; prefer the former
4129 warning since it is more explicit. */
4130 if ((warn_implicit_int || warn_return_type) && funcdef_flag)
4131 warn_about_return_type = 1;
4132 else if (warn_implicit_int || flag_isoc99)
4133 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
4138 type = integer_type_node;
4141 /* Now process the modifiers that were specified
4142 and check for invalid combinations. */
4144 /* Long double is a special combination. */
4146 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4147 && TYPE_MAIN_VARIANT (type) == double_type_node)
4149 specbits &= ~(1 << (int) RID_LONG);
4150 type = long_double_type_node;
4153 /* Check all other uses of type modifiers. */
4155 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4156 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4160 if ((specbits & 1 << (int) RID_LONG)
4161 && (specbits & 1 << (int) RID_SHORT))
4162 error ("both long and short specified for `%s'", name);
4163 else if (((specbits & 1 << (int) RID_LONG)
4164 || (specbits & 1 << (int) RID_SHORT))
4166 error ("long or short specified with char for `%s'", name);
4167 else if (((specbits & 1 << (int) RID_LONG)
4168 || (specbits & 1 << (int) RID_SHORT))
4169 && TREE_CODE (type) == REAL_TYPE)
4171 static int already = 0;
4173 error ("long or short specified with floating type for `%s'", name);
4174 if (! already && ! pedantic)
4176 error ("the only valid combination is `long double'");
4180 else if ((specbits & 1 << (int) RID_SIGNED)
4181 && (specbits & 1 << (int) RID_UNSIGNED))
4182 error ("both signed and unsigned specified for `%s'", name);
4183 else if (TREE_CODE (type) != INTEGER_TYPE)
4184 error ("long, short, signed or unsigned invalid for `%s'", name);
4188 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4190 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4192 if (flag_pedantic_errors)
4197 /* Discard the type modifiers if they are invalid. */
4200 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4201 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4206 if ((specbits & (1 << (int) RID_COMPLEX))
4207 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4209 error ("complex invalid for `%s'", name);
4210 specbits &= ~(1 << (int) RID_COMPLEX);
4213 /* Decide whether an integer type is signed or not.
4214 Optionally treat bitfields as signed by default. */
4215 if (specbits & 1 << (int) RID_UNSIGNED
4216 /* Traditionally, all bitfields are unsigned. */
4217 || (bitfield && flag_traditional
4218 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4219 || (bitfield && ! flag_signed_bitfields
4220 && (explicit_int || defaulted_int || explicit_char
4221 /* A typedef for plain `int' without `signed'
4222 can be controlled just like plain `int'. */
4223 || ! (typedef_decl != 0
4224 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4225 && TREE_CODE (type) != ENUMERAL_TYPE
4226 && !(specbits & 1 << (int) RID_SIGNED)))
4229 type = long_long_unsigned_type_node;
4230 else if (specbits & 1 << (int) RID_LONG)
4231 type = long_unsigned_type_node;
4232 else if (specbits & 1 << (int) RID_SHORT)
4233 type = short_unsigned_type_node;
4234 else if (type == char_type_node)
4235 type = unsigned_char_type_node;
4236 else if (typedef_decl)
4237 type = unsigned_type (type);
4239 type = unsigned_type_node;
4241 else if ((specbits & 1 << (int) RID_SIGNED)
4242 && type == char_type_node)
4243 type = signed_char_type_node;
4245 type = long_long_integer_type_node;
4246 else if (specbits & 1 << (int) RID_LONG)
4247 type = long_integer_type_node;
4248 else if (specbits & 1 << (int) RID_SHORT)
4249 type = short_integer_type_node;
4251 if (specbits & 1 << (int) RID_COMPLEX)
4253 if (pedantic && !flag_isoc99)
4254 pedwarn ("ISO C89 does not support complex types");
4255 /* If we just have "complex", it is equivalent to
4256 "complex double", but if any modifiers at all are specified it is
4257 the complex form of TYPE. E.g, "complex short" is
4258 "complex short int". */
4260 if (defaulted_int && ! longlong
4261 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4262 | (1 << (int) RID_SIGNED)
4263 | (1 << (int) RID_UNSIGNED))))
4266 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
4267 type = complex_double_type_node;
4269 else if (type == integer_type_node)
4272 pedwarn ("ISO C does not support complex integer types");
4273 type = complex_integer_type_node;
4275 else if (type == float_type_node)
4276 type = complex_float_type_node;
4277 else if (type == double_type_node)
4278 type = complex_double_type_node;
4279 else if (type == long_double_type_node)
4280 type = complex_long_double_type_node;
4284 pedwarn ("ISO C does not support complex integer types");
4285 type = build_complex_type (type);
4289 /* Figure out the type qualifiers for the declaration. There are
4290 two ways a declaration can become qualified. One is something
4291 like `const int i' where the `const' is explicit. Another is
4292 something like `typedef const int CI; CI i' where the type of the
4293 declaration contains the `const'. */
4294 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4295 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
4296 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4297 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4298 if (constp > 1 && ! flag_isoc99)
4299 pedwarn ("duplicate `const'");
4300 if (restrictp > 1 && ! flag_isoc99)
4301 pedwarn ("duplicate `restrict'");
4302 if (volatilep > 1 && ! flag_isoc99)
4303 pedwarn ("duplicate `volatile'");
4304 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
4305 type = TYPE_MAIN_VARIANT (type);
4306 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4307 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4308 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4310 /* Warn if two storage classes are given. Default to `auto'. */
4315 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4316 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4317 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4318 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4319 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4321 /* Warn about storage classes that are invalid for certain
4322 kinds of declarations (parameters, typenames, etc.). */
4325 error ("multiple storage classes in declaration of `%s'", name);
4326 else if (funcdef_flag
4328 & ((1 << (int) RID_REGISTER)
4329 | (1 << (int) RID_AUTO)
4330 | (1 << (int) RID_TYPEDEF))))
4332 if (specbits & 1 << (int) RID_AUTO
4333 && (pedantic || current_binding_level == global_binding_level))
4334 pedwarn ("function definition declared `auto'");
4335 if (specbits & 1 << (int) RID_REGISTER)
4336 error ("function definition declared `register'");
4337 if (specbits & 1 << (int) RID_TYPEDEF)
4338 error ("function definition declared `typedef'");
4339 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4340 | (1 << (int) RID_AUTO));
4342 else if (decl_context != NORMAL && nclasses > 0)
4344 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4348 switch (decl_context)
4351 error ("storage class specified for structure field `%s'",
4355 error ("storage class specified for parameter `%s'", name);
4358 error ("storage class specified for typename");
4361 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4362 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4363 | (1 << (int) RID_EXTERN));
4366 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4368 /* `extern' with initialization is invalid if not at top level. */
4369 if (current_binding_level == global_binding_level)
4370 warning ("`%s' initialized and declared `extern'", name);
4372 error ("`%s' has both `extern' and initializer", name);
4374 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4375 && current_binding_level != global_binding_level)
4376 error ("nested function `%s' declared `extern'", name);
4377 else if (current_binding_level == global_binding_level
4378 && specbits & (1 << (int) RID_AUTO))
4379 error ("top-level declaration of `%s' specifies `auto'", name);
4382 /* Now figure out the structure of the declarator proper.
4383 Descend through it, creating more complex types, until we reach
4384 the declared identifier (or NULL_TREE, in an absolute declarator). */
4386 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4388 if (type == error_mark_node)
4390 declarator = TREE_OPERAND (declarator, 0);
4394 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4395 an INDIRECT_REF (for *...),
4396 a CALL_EXPR (for ...(...)),
4397 an identifier (for the name being declared)
4398 or a null pointer (for the place in an absolute declarator
4399 where the name was omitted).
4400 For the last two cases, we have just exited the loop.
4402 At this point, TYPE is the type of elements of an array,
4403 or for a function to return, or for a pointer to point to.
4404 After this sequence of ifs, TYPE is the type of the
4405 array or function or pointer, and DECLARATOR has had its
4406 outermost layer removed. */
4408 if (TREE_CODE (declarator) == ARRAY_REF)
4410 register tree itype = NULL_TREE;
4411 register tree size = TREE_OPERAND (declarator, 1);
4412 /* The index is a signed object `sizetype' bits wide. */
4413 tree index_type = signed_type (sizetype);
4415 declarator = TREE_OPERAND (declarator, 0);
4417 /* Check for some types that there cannot be arrays of. */
4419 if (VOID_TYPE_P (type))
4421 error ("declaration of `%s' as array of voids", name);
4422 type = error_mark_node;
4425 if (TREE_CODE (type) == FUNCTION_TYPE)
4427 error ("declaration of `%s' as array of functions", name);
4428 type = error_mark_node;
4431 if (size == error_mark_node)
4432 type = error_mark_node;
4434 if (type == error_mark_node)
4437 /* If size was specified, set ITYPE to a range-type for that size.
4438 Otherwise, ITYPE remains null. finish_decl may figure it out
4439 from an initial value. */
4443 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4444 STRIP_TYPE_NOPS (size);
4446 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
4447 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
4449 error ("size of array `%s' has non-integer type", name);
4450 size = integer_one_node;
4453 if (pedantic && integer_zerop (size))
4454 pedwarn ("ISO C forbids zero-size array `%s'", name);
4456 if (TREE_CODE (size) == INTEGER_CST)
4458 constant_expression_warning (size);
4459 if (tree_int_cst_sgn (size) < 0)
4461 error ("size of array `%s' is negative", name);
4462 size = integer_one_node;
4467 /* Make sure the array size remains visibly nonconstant
4468 even if it is (eg) a const variable with known value. */
4473 if (TREE_CONSTANT (size))
4474 pedwarn ("ISO C89 forbids array `%s' whose size can't be evaluated",
4477 pedwarn ("ISO C89 forbids variable-size array `%s'",
4482 if (integer_zerop (size))
4484 /* A zero-length array cannot be represented with an
4485 unsigned index type, which is what we'll get with
4486 build_index_type. Create an open-ended range instead. */
4487 itype = build_range_type (sizetype, size, NULL_TREE);
4491 /* Compute the maximum valid index, that is, size - 1.
4492 Do the calculation in index_type, so that if it is
4493 a variable the computations will be done in the
4495 itype = fold (build (MINUS_EXPR, index_type,
4496 convert (index_type, size),
4497 convert (index_type, size_one_node)));
4499 /* If that overflowed, the array is too big.
4500 ??? While a size of INT_MAX+1 technically shouldn't
4501 cause an overflow (because we subtract 1), the overflow
4502 is recorded during the conversion to index_type, before
4503 the subtraction. Handling this case seems like an
4504 unnecessary complication. */
4505 if (TREE_OVERFLOW (itype))
4507 error ("size of array `%s' is too large", name);
4508 type = error_mark_node;
4513 itype = variable_size (itype);
4514 itype = build_index_type (itype);
4517 else if (decl_context == FIELD)
4519 /* ??? Need to check somewhere that this is a structure
4520 and not a union, that this field is last, and that
4521 this structure has at least one other named member. */
4523 if (pedantic && !flag_isoc99 && !in_system_header)
4524 pedwarn ("ISO C89 does not support flexible array members");
4526 /* ISO C99 Flexible array members are effectively identical
4527 to GCC's zero-length array extension. */
4528 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4532 /* This had bad results for pointers to arrays, as in
4533 union incomplete (*foo)[4]; */
4534 /* Complain about arrays of incomplete types, except in typedefs. */
4536 if (!COMPLETE_TYPE_P (type)
4537 /* Avoid multiple warnings for nested array types. */
4538 && TREE_CODE (type) != ARRAY_TYPE
4539 && !(specbits & (1 << (int) RID_TYPEDEF))
4540 && !C_TYPE_BEING_DEFINED (type))
4541 warning ("array type has incomplete element type");
4545 /* We shouldn't have a function type here at all!
4546 Functions aren't allowed as array elements. */
4547 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4548 && (constp || volatilep))
4549 pedwarn ("ANSI C forbids const or volatile function types");
4552 /* Build the array type itself, then merge any constancy or
4553 volatility into the target type. We must do it in this order
4554 to ensure that the TYPE_MAIN_VARIANT field of the array type
4555 is set correctly. */
4557 type = build_array_type (type, itype);
4559 type = c_build_qualified_type (type, type_quals);
4562 /* Don't clear these; leave them set so that the array type
4563 or the variable is itself const or volatile. */
4564 type_quals = TYPE_UNQUALIFIED;
4568 C_TYPE_VARIABLE_SIZE (type) = 1;
4570 else if (TREE_CODE (declarator) == CALL_EXPR)
4574 /* Declaring a function type.
4575 Make sure we have a valid type for the function to return. */
4576 if (type == error_mark_node)
4581 /* Warn about some types functions can't return. */
4583 if (TREE_CODE (type) == FUNCTION_TYPE)
4585 error ("`%s' declared as function returning a function", name);
4586 type = integer_type_node;
4588 if (TREE_CODE (type) == ARRAY_TYPE)
4590 error ("`%s' declared as function returning an array", name);
4591 type = integer_type_node;
4594 #ifndef TRADITIONAL_RETURN_FLOAT
4595 /* Traditionally, declaring return type float means double. */
4597 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4598 type = double_type_node;
4599 #endif /* TRADITIONAL_RETURN_FLOAT */
4601 /* Construct the function type and go to the next
4602 inner layer of declarator. */
4604 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4606 /* Say it's a definition
4607 only for the CALL_EXPR
4608 closest to the identifier. */
4609 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4610 /* Type qualifiers before the return type of the function
4611 qualify the return type, not the function type. */
4614 /* Type qualifiers on a function return type are normally
4615 permitted by the standard but have no effect, so give a
4616 warning at -W. Qualifiers on a void return type have
4617 meaning as a GNU extension, and are banned on function
4618 definitions in ISO C. FIXME: strictly we shouldn't
4619 pedwarn for qualified void return types except on function
4620 definitions, but not doing so could lead to the undesirable
4621 state of a "volatile void" function return type not being
4622 warned about, and a use of the function being compiled
4623 with GNU semantics, with no diagnostics under -pedantic. */
4624 if (VOID_TYPE_P (type) && pedantic && !in_system_header)
4625 pedwarn ("ISO C forbids qualified void function return type");
4626 else if (extra_warnings
4627 && !(VOID_TYPE_P (type)
4628 && type_quals == TYPE_QUAL_VOLATILE))
4629 warning ("type qualifiers ignored on function return type");
4631 type = c_build_qualified_type (type, type_quals);
4633 type_quals = TYPE_UNQUALIFIED;
4635 type = build_function_type (type, arg_types);
4636 declarator = TREE_OPERAND (declarator, 0);
4638 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4639 the formal parameter list of this FUNCTION_TYPE to point to
4640 the FUNCTION_TYPE node itself. */
4645 for (link = last_function_parm_tags;
4647 link = TREE_CHAIN (link))
4648 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4651 else if (TREE_CODE (declarator) == INDIRECT_REF)
4653 /* Merge any constancy or volatility into the target type
4656 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4658 pedwarn ("ISO C forbids qualified function types");
4660 type = c_build_qualified_type (type, type_quals);
4661 type_quals = TYPE_UNQUALIFIED;
4664 type = build_pointer_type (type);
4666 /* Process a list of type modifier keywords
4667 (such as const or volatile) that were given inside the `*'. */
4669 if (TREE_TYPE (declarator))
4671 register tree typemodlist;
4677 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4678 typemodlist = TREE_CHAIN (typemodlist))
4680 tree qualifier = TREE_VALUE (typemodlist);
4682 if (C_IS_RESERVED_WORD (qualifier))
4684 if (C_RID_CODE (qualifier) == RID_CONST)
4686 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4688 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4698 error ("invalid type modifier within pointer declarator");
4699 if (constp > 1 && ! flag_isoc99)
4700 pedwarn ("duplicate `const'");
4701 if (volatilep > 1 && ! flag_isoc99)
4702 pedwarn ("duplicate `volatile'");
4703 if (restrictp > 1 && ! flag_isoc99)
4704 pedwarn ("duplicate `restrict'");
4706 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4707 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4708 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4711 declarator = TREE_OPERAND (declarator, 0);
4718 /* Now TYPE has the actual type. */
4720 /* Did array size calculations overflow? */
4722 if (TREE_CODE (type) == ARRAY_TYPE
4723 && COMPLETE_TYPE_P (type)
4724 && TREE_OVERFLOW (TYPE_SIZE (type)))
4725 error ("size of array `%s' is too large", name);
4727 /* If this is declaring a typedef name, return a TYPE_DECL. */
4729 if (specbits & (1 << (int) RID_TYPEDEF))
4732 /* Note that the grammar rejects storage classes
4733 in typenames, fields or parameters */
4734 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4736 pedwarn ("ISO C forbids qualified function types");
4738 type = c_build_qualified_type (type, type_quals);
4739 decl = build_decl (TYPE_DECL, declarator, type);
4740 if ((specbits & (1 << (int) RID_SIGNED))
4741 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4742 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4746 /* Detect the case of an array type of unspecified size
4747 which came, as such, direct from a typedef name.
4748 We must copy the type, so that each identifier gets
4749 a distinct type, so that each identifier's size can be
4750 controlled separately by its own initializer. */
4752 if (type != 0 && typedef_type != 0
4753 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4754 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4756 type = build_array_type (TREE_TYPE (type), 0);
4758 C_TYPE_VARIABLE_SIZE (type) = 1;
4761 /* If this is a type name (such as, in a cast or sizeof),
4762 compute the type and return it now. */
4764 if (decl_context == TYPENAME)
4766 /* Note that the grammar rejects storage classes
4767 in typenames, fields or parameters */
4768 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4770 pedwarn ("ISO C forbids const or volatile function types");
4772 type = c_build_qualified_type (type, type_quals);
4776 /* Aside from typedefs and type names (handle above),
4777 `void' at top level (not within pointer)
4778 is allowed only in public variables.
4779 We don't complain about parms either, but that is because
4780 a better error message can be made later. */
4782 if (VOID_TYPE_P (type) && decl_context != PARM
4783 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4784 && ((specbits & (1 << (int) RID_EXTERN))
4785 || (current_binding_level == global_binding_level
4787 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4789 error ("variable or field `%s' declared void", name);
4790 type = integer_type_node;
4793 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4794 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4799 if (decl_context == PARM)
4801 tree type_as_written = type;
4804 /* A parameter declared as an array of T is really a pointer to T.
4805 One declared as a function is really a pointer to a function. */
4807 if (TREE_CODE (type) == ARRAY_TYPE)
4809 /* Transfer const-ness of array into that of type pointed to. */
4810 type = TREE_TYPE (type);
4812 type = c_build_qualified_type (type, type_quals);
4813 type = build_pointer_type (type);
4814 type_quals = TYPE_UNQUALIFIED;
4817 else if (TREE_CODE (type) == FUNCTION_TYPE)
4819 if (pedantic && type_quals)
4820 pedwarn ("ISO C forbids qualified function types");
4822 type = c_build_qualified_type (type, type_quals);
4823 type = build_pointer_type (type);
4824 type_quals = TYPE_UNQUALIFIED;
4827 decl = build_decl (PARM_DECL, declarator, type);
4829 C_DECL_VARIABLE_SIZE (decl) = 1;
4831 /* Compute the type actually passed in the parmlist,
4832 for the case where there is no prototype.
4833 (For example, shorts and chars are passed as ints.)
4834 When there is a prototype, this is overridden later. */
4836 if (type == error_mark_node)
4837 promoted_type = type;
4840 promoted_type = simple_type_promotes_to (type);
4841 if (! promoted_type)
4842 promoted_type = type;
4845 DECL_ARG_TYPE (decl) = promoted_type;
4846 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4848 else if (decl_context == FIELD)
4850 /* Structure field. It may not be a function. */
4852 if (TREE_CODE (type) == FUNCTION_TYPE)
4854 error ("field `%s' declared as a function", name);
4855 type = build_pointer_type (type);
4857 else if (TREE_CODE (type) != ERROR_MARK
4858 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4860 error ("field `%s' has incomplete type", name);
4861 type = error_mark_node;
4863 /* Move type qualifiers down to element of an array. */
4864 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4866 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4868 TYPE_DOMAIN (type));
4870 /* Leave the field const or volatile as well. */
4871 type_quals = TYPE_UNQUALIFIED;
4874 decl = build_decl (FIELD_DECL, declarator, type);
4875 DECL_NONADDRESSABLE_P (decl) = bitfield;
4878 C_DECL_VARIABLE_SIZE (decl) = 1;
4880 else if (TREE_CODE (type) == FUNCTION_TYPE)
4882 /* Every function declaration is "external"
4883 except for those which are inside a function body
4884 in which `auto' is used.
4885 That is a case not specified by ANSI C,
4886 and we use it for forward declarations for nested functions. */
4887 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4888 || current_binding_level == global_binding_level);
4890 if (specbits & (1 << (int) RID_AUTO)
4891 && (pedantic || current_binding_level == global_binding_level))
4892 pedwarn ("invalid storage class for function `%s'", name);
4893 if (specbits & (1 << (int) RID_REGISTER))
4894 error ("invalid storage class for function `%s'", name);
4895 /* Function declaration not at top level.
4896 Storage classes other than `extern' are not allowed
4897 and `extern' makes no difference. */
4898 if (current_binding_level != global_binding_level
4899 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4901 pedwarn ("invalid storage class for function `%s'", name);
4903 decl = build_decl (FUNCTION_DECL, declarator, type);
4904 decl = build_decl_attribute_variant (decl, decl_machine_attr);
4906 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4907 pedwarn ("ISO C forbids qualified function types");
4909 /* GNU C interprets a `volatile void' return type to indicate
4910 that the function does not return. */
4911 if ((type_quals & TYPE_QUAL_VOLATILE)
4912 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4913 warning ("`noreturn' function returns non-void value");
4916 DECL_EXTERNAL (decl) = 1;
4917 /* Record absence of global scope for `static' or `auto'. */
4919 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4921 /* Record presence of `inline', if it is reasonable. */
4924 if (MAIN_NAME_P (declarator))
4925 warning ("cannot inline function `main'");
4927 /* Assume that otherwise the function can be inlined. */
4928 DECL_INLINE (decl) = 1;
4930 if (specbits & (1 << (int) RID_EXTERN))
4931 current_extern_inline = 1;
4936 /* It's a variable. */
4937 /* An uninitialized decl with `extern' is a reference. */
4938 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4940 /* Move type qualifiers down to element of an array. */
4941 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4943 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4945 TYPE_DOMAIN (type));
4946 #if 0 /* Leave the variable const or volatile as well. */
4947 type_quals = TYPE_UNQUALIFIED;
4951 decl = build_decl (VAR_DECL, declarator, type);
4953 C_DECL_VARIABLE_SIZE (decl) = 1;
4956 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4958 DECL_EXTERNAL (decl) = extern_ref;
4959 /* At top level, the presence of a `static' or `register' storage
4960 class specifier, or the absence of all storage class specifiers
4961 makes this declaration a definition (perhaps tentative). Also,
4962 the absence of both `static' and `register' makes it public. */
4963 if (current_binding_level == global_binding_level)
4967 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
4968 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
4970 /* Not at top level, only `static' makes a static definition. */
4973 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4974 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
4978 /* Record `register' declaration for warnings on &
4979 and in case doing stupid register allocation. */
4981 if (specbits & (1 << (int) RID_REGISTER))
4982 DECL_REGISTER (decl) = 1;
4984 /* Record constancy and volatility. */
4985 c_apply_type_quals_to_decl (type_quals, decl);
4987 /* If a type has volatile components, it should be stored in memory.
4988 Otherwise, the fact that those components are volatile
4989 will be ignored, and would even crash the compiler. */
4990 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4991 mark_addressable (decl);
4997 /* Decode the parameter-list info for a function type or function definition.
4998 The argument is the value returned by `get_parm_info' (or made in parse.y
4999 if there is an identifier list instead of a parameter decl list).
5000 These two functions are separate because when a function returns
5001 or receives functions then each is called multiple times but the order
5002 of calls is different. The last call to `grokparms' is always the one
5003 that contains the formal parameter names of a function definition.
5005 Store in `last_function_parms' a chain of the decls of parms.
5006 Also store in `last_function_parm_tags' a chain of the struct, union,
5007 and enum tags declared among the parms.
5009 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5011 FUNCDEF_FLAG is nonzero for a function definition, 0 for
5012 a mere declaration. A nonempty identifier-list gets an error message
5013 when FUNCDEF_FLAG is zero. */
5016 grokparms (parms_info, funcdef_flag)
5020 tree first_parm = TREE_CHAIN (parms_info);
5022 last_function_parms = TREE_PURPOSE (parms_info);
5023 last_function_parm_tags = TREE_VALUE (parms_info);
5025 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
5026 && !in_system_header)
5027 warning ("function declaration isn't a prototype");
5030 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
5033 pedwarn ("parameter names (without types) in function declaration");
5035 last_function_parms = first_parm;
5042 /* We no longer test FUNCDEF_FLAG.
5043 If the arg types are incomplete in a declaration,
5044 they must include undefined tags.
5045 These tags can never be defined in the scope of the declaration,
5046 so the types can never be completed,
5047 and no call can be compiled successfully. */
5049 /* In a fcn definition, arg types must be complete. */
5052 for (parm = last_function_parms, typelt = first_parm;
5054 parm = TREE_CHAIN (parm))
5055 /* Skip over any enumeration constants declared here. */
5056 if (TREE_CODE (parm) == PARM_DECL)
5058 /* Barf if the parameter itself has an incomplete type. */
5059 tree type = TREE_VALUE (typelt);
5060 if (!COMPLETE_TYPE_P (type))
5062 if (funcdef_flag && DECL_NAME (parm) != 0)
5063 error ("parameter `%s' has incomplete type",
5064 IDENTIFIER_POINTER (DECL_NAME (parm)));
5066 warning ("parameter has incomplete type");
5069 TREE_VALUE (typelt) = error_mark_node;
5070 TREE_TYPE (parm) = error_mark_node;
5074 /* This has been replaced by parm_tags_warning, which
5075 uses a more accurate criterion for what to warn
5079 /* Now warn if is a pointer to an incomplete type. */
5080 while (TREE_CODE (type) == POINTER_TYPE
5081 || TREE_CODE (type) == REFERENCE_TYPE)
5082 type = TREE_TYPE (type);
5083 type = TYPE_MAIN_VARIANT (type);
5084 if (!COMPLETE_TYPE_P (type))
5086 if (DECL_NAME (parm) != 0)
5087 warning ("parameter `%s' points to incomplete type",
5088 IDENTIFIER_POINTER (DECL_NAME (parm)));
5090 warning ("parameter points to incomplete type");
5094 typelt = TREE_CHAIN (typelt);
5101 /* Return a tree_list node with info on a parameter list just parsed.
5102 The TREE_PURPOSE is a chain of decls of those parms.
5103 The TREE_VALUE is a list of structure, union and enum tags defined.
5104 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5105 This tree_list node is later fed to `grokparms'.
5107 VOID_AT_END nonzero means append `void' to the end of the type-list.
5108 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5111 get_parm_info (void_at_end)
5114 register tree decl, t;
5115 register tree types = 0;
5117 tree tags = gettags ();
5118 tree parms = getdecls ();
5120 tree order = current_binding_level->parm_order;
5122 /* Just `void' (and no ellipsis) is special. There are really no parms.
5123 But if the `void' is qualified (by `const' or `volatile') or has a
5124 storage class specifier (`register'), then the behavior is undefined;
5125 by not counting it as the special case of `void' we will cause an
5126 error later. Typedefs for `void' are OK (see DR#157). */
5127 if (void_at_end && parms != 0
5128 && TREE_CHAIN (parms) == 0
5129 && VOID_TYPE_P (TREE_TYPE (parms))
5130 && ! TREE_THIS_VOLATILE (parms)
5131 && ! TREE_READONLY (parms)
5132 && ! DECL_REGISTER (parms)
5133 && DECL_NAME (parms) == 0)
5136 storedecls (NULL_TREE);
5137 return tree_cons (NULL_TREE, NULL_TREE,
5138 tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5141 /* Extract enumerator values and other non-parms declared with the parms.
5142 Likewise any forward parm decls that didn't have real parm decls. */
5143 for (decl = parms; decl;)
5145 tree next = TREE_CHAIN (decl);
5147 if (TREE_CODE (decl) != PARM_DECL)
5149 TREE_CHAIN (decl) = new_parms;
5152 else if (TREE_ASM_WRITTEN (decl))
5154 error_with_decl (decl,
5155 "parameter `%s' has just a forward declaration");
5156 TREE_CHAIN (decl) = new_parms;
5162 /* Put the parm decls back in the order they were in in the parm list. */
5163 for (t = order; t; t = TREE_CHAIN (t))
5166 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5168 TREE_CHAIN (TREE_VALUE (t)) = 0;
5171 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5174 /* Store the parmlist in the binding level since the old one
5175 is no longer a valid list. (We have changed the chain pointers.) */
5176 storedecls (new_parms);
5178 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5179 /* There may also be declarations for enumerators if an enumeration
5180 type is declared among the parms. Ignore them here. */
5181 if (TREE_CODE (decl) == PARM_DECL)
5183 /* Since there is a prototype,
5184 args are passed in their declared types. */
5185 tree type = TREE_TYPE (decl);
5186 DECL_ARG_TYPE (decl) = type;
5187 if (PROMOTE_PROTOTYPES
5188 && (TREE_CODE (type) == INTEGER_TYPE
5189 || TREE_CODE (type) == ENUMERAL_TYPE)
5190 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5191 DECL_ARG_TYPE (decl) = integer_type_node;
5193 types = tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5194 if (VOID_TYPE_P (TREE_VALUE (types)) && ! erred
5195 && DECL_NAME (decl) == 0)
5197 error ("`void' in parameter list must be the entire list");
5203 return tree_cons (new_parms, tags,
5204 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
5206 return tree_cons (new_parms, tags, nreverse (types));
5209 /* At end of parameter list, warn about any struct, union or enum tags
5210 defined within. Do so because these types cannot ever become complete. */
5213 parmlist_tags_warning ()
5218 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5220 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5221 /* An anonymous union parm type is meaningful as a GNU extension.
5222 So don't warn for that. */
5223 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5225 if (TREE_PURPOSE (elt) != 0)
5226 warning ("`%s %s' declared inside parameter list",
5227 (code == RECORD_TYPE ? "struct"
5228 : code == UNION_TYPE ? "union"
5230 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5233 /* For translation these need to be seperate warnings */
5234 if (code == RECORD_TYPE)
5235 warning ("anonymous struct declared inside parameter list");
5236 else if (code == UNION_TYPE)
5237 warning ("anonymous union declared inside parameter list");
5239 warning ("anonymous enum declared inside parameter list");
5243 warning ("its scope is only this definition or declaration, which is probably not what you want.");
5249 /* Get the struct, enum or union (CODE says which) with tag NAME.
5250 Define the tag as a forward-reference if it is not defined. */
5253 xref_tag (code, name)
5254 enum tree_code code;
5257 /* If a cross reference is requested, look up the type
5258 already defined for this tag and return it. */
5260 register tree ref = lookup_tag (code, name, current_binding_level, 0);
5261 /* Even if this is the wrong type of tag, return what we found.
5262 There will be an error message anyway, from pending_xref_error.
5263 If we create an empty xref just for an invalid use of the type,
5264 the main result is to create lots of superfluous error messages. */
5268 /* If no such tag is yet defined, create a forward-reference node
5269 and record it as the "definition".
5270 When a real declaration of this type is found,
5271 the forward-reference will be altered into a real type. */
5273 ref = make_node (code);
5274 if (code == ENUMERAL_TYPE)
5276 /* (In ANSI, Enums can be referred to only if already defined.) */
5278 pedwarn ("ISO C forbids forward references to `enum' types");
5279 /* Give the type a default layout like unsigned int
5280 to avoid crashing if it does not get defined. */
5281 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5282 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5283 TYPE_USER_ALIGN (ref) = 0;
5284 TREE_UNSIGNED (ref) = 1;
5285 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5286 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5287 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5290 pushtag (name, ref);
5295 /* Make sure that the tag NAME is defined *in the current binding level*
5296 at least as a forward reference.
5297 CODE says which kind of tag NAME ought to be. */
5300 start_struct (code, name)
5301 enum tree_code code;
5304 /* If there is already a tag defined at this binding level
5305 (as a forward reference), just return it. */
5307 register tree ref = 0;
5310 ref = lookup_tag (code, name, current_binding_level, 1);
5311 if (ref && TREE_CODE (ref) == code)
5313 C_TYPE_BEING_DEFINED (ref) = 1;
5314 TYPE_PACKED (ref) = flag_pack_struct;
5315 if (TYPE_FIELDS (ref))
5316 error ("redefinition of `%s %s'",
5317 code == UNION_TYPE ? "union" : "struct",
5318 IDENTIFIER_POINTER (name));
5323 /* Otherwise create a forward-reference just so the tag is in scope. */
5325 ref = make_node (code);
5326 pushtag (name, ref);
5327 C_TYPE_BEING_DEFINED (ref) = 1;
5328 TYPE_PACKED (ref) = flag_pack_struct;
5332 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5333 of a structure component, returning a FIELD_DECL node.
5334 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5336 This is done during the parsing of the struct declaration.
5337 The FIELD_DECL nodes are chained together and the lot of them
5338 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5341 grokfield (filename, line, declarator, declspecs, width)
5342 const char *filename ATTRIBUTE_UNUSED;
5343 int line ATTRIBUTE_UNUSED;
5344 tree declarator, declspecs, width;
5348 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5350 finish_decl (value, NULL_TREE, NULL_TREE);
5351 DECL_INITIAL (value) = width;
5353 maybe_objc_check_decl (value);
5357 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5358 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5359 ATTRIBUTES are attributes to be applied to the structure. */
5362 finish_struct (t, fieldlist, attributes)
5368 int toplevel = global_binding_level == current_binding_level;
5370 /* If this type was previously laid out as a forward reference,
5371 make sure we lay it out again. */
5375 decl_attributes (t, attributes, NULL_TREE);
5377 /* Nameless union parm types are useful as GCC extension. */
5378 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5379 /* Otherwise, warn about any struct or union def. in parmlist. */
5380 if (in_parm_level_p ())
5383 pedwarn ("%s defined inside parms",
5384 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5385 else if (! flag_traditional)
5386 warning ("%s defined inside parms",
5387 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5392 for (x = fieldlist; x; x = TREE_CHAIN (x))
5393 if (DECL_NAME (x) != 0)
5397 pedwarn ("%s has no %s",
5398 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
5399 fieldlist ? _("named members") : _("members"));
5402 /* Install struct as DECL_CONTEXT of each field decl.
5403 Also process specified field sizes,m which is found in the DECL_INITIAL.
5404 Store 0 there, except for ": 0" fields (so we can find them
5405 and delete them, below). */
5407 for (x = fieldlist; x; x = TREE_CHAIN (x))
5409 DECL_CONTEXT (x) = t;
5410 DECL_PACKED (x) |= TYPE_PACKED (t);
5412 /* If any field is const, the structure type is pseudo-const. */
5413 if (TREE_READONLY (x))
5414 C_TYPE_FIELDS_READONLY (t) = 1;
5417 /* A field that is pseudo-const makes the structure likewise. */
5418 tree t1 = TREE_TYPE (x);
5419 while (TREE_CODE (t1) == ARRAY_TYPE)
5420 t1 = TREE_TYPE (t1);
5421 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5422 && C_TYPE_FIELDS_READONLY (t1))
5423 C_TYPE_FIELDS_READONLY (t) = 1;
5426 /* Any field that is volatile means variables of this type must be
5427 treated in some ways as volatile. */
5428 if (TREE_THIS_VOLATILE (x))
5429 C_TYPE_FIELDS_VOLATILE (t) = 1;
5431 /* Any field of nominal variable size implies structure is too. */
5432 if (C_DECL_VARIABLE_SIZE (x))
5433 C_TYPE_VARIABLE_SIZE (t) = 1;
5435 /* Detect invalid nested redefinition. */
5436 if (TREE_TYPE (x) == t)
5437 error ("nested redefinition of `%s'",
5438 IDENTIFIER_POINTER (TYPE_NAME (t)));
5440 /* Detect invalid bit-field size. */
5441 if (DECL_INITIAL (x))
5442 STRIP_NOPS (DECL_INITIAL (x));
5443 if (DECL_INITIAL (x))
5445 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5446 constant_expression_warning (DECL_INITIAL (x));
5450 "bit-field `%s' width not an integer constant");
5451 DECL_INITIAL (x) = NULL;
5455 /* Detect invalid bit-field type. */
5456 if (DECL_INITIAL (x)
5457 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5458 && TREE_CODE (TREE_TYPE (x)) != BOOLEAN_TYPE
5459 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5461 error_with_decl (x, "bit-field `%s' has invalid type");
5462 DECL_INITIAL (x) = NULL;
5465 if (DECL_INITIAL (x) && pedantic
5466 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5467 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5468 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != c_bool_type_node
5469 /* Accept an enum that's equivalent to int or unsigned int. */
5470 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5471 && (TYPE_PRECISION (TREE_TYPE (x))
5472 == TYPE_PRECISION (integer_type_node))))
5473 pedwarn_with_decl (x, "bit-field `%s' type invalid in ISO C");
5475 /* Detect and ignore out of range field width and process valid
5477 if (DECL_INITIAL (x))
5480 if (TYPE_MAIN_VARIANT (TREE_TYPE (x)) == c_bool_type_node)
5481 max_width = CHAR_TYPE_SIZE;
5483 max_width = TYPE_PRECISION (TREE_TYPE (x));
5484 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5485 error_with_decl (x, "negative width in bit-field `%s'");
5486 else if (0 < compare_tree_int (DECL_INITIAL (x), max_width))
5487 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5488 else if (integer_zerop (DECL_INITIAL (x)) && DECL_NAME (x) != 0)
5489 error_with_decl (x, "zero width for bit-field `%s'");
5492 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
5493 unsigned HOST_WIDE_INT width
5494 = TREE_INT_CST_LOW (DECL_INITIAL (x));
5496 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5497 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5498 TREE_UNSIGNED (TREE_TYPE (x)))
5500 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5501 TREE_UNSIGNED (TREE_TYPE (x))))))
5502 warning_with_decl (x,
5503 "`%s' is narrower than values of its type");
5505 DECL_SIZE (x) = bitsize_int (width);
5506 DECL_BIT_FIELD (x) = 1;
5507 SET_DECL_C_BIT_FIELD (x);
5511 /* field size 0 => force desired amount of alignment. */
5512 #ifdef EMPTY_FIELD_BOUNDARY
5513 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5515 #ifdef PCC_BITFIELD_TYPE_MATTERS
5516 if (PCC_BITFIELD_TYPE_MATTERS)
5518 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5519 TYPE_ALIGN (TREE_TYPE (x)));
5520 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5527 else if (TREE_TYPE (x) != error_mark_node)
5529 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5530 : TYPE_ALIGN (TREE_TYPE (x)));
5532 /* Non-bit-fields are aligned for their type, except packed
5533 fields which require only BITS_PER_UNIT alignment. */
5534 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5535 if (! DECL_PACKED (x))
5536 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5539 DECL_INITIAL (x) = 0;
5542 /* Delete all duplicate fields from the fieldlist */
5543 for (x = fieldlist; x && TREE_CHAIN (x);)
5544 /* Anonymous fields aren't duplicates. */
5545 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5549 register tree y = fieldlist;
5553 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5559 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5561 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5562 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5568 /* Now we have the nearly final fieldlist. Record it,
5569 then lay out the structure or union (including the fields). */
5571 TYPE_FIELDS (t) = fieldlist;
5575 /* Delete all zero-width bit-fields from the fieldlist */
5577 tree *fieldlistp = &fieldlist;
5579 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5580 *fieldlistp = TREE_CHAIN (*fieldlistp);
5582 fieldlistp = &TREE_CHAIN (*fieldlistp);
5585 /* Now we have the truly final field list.
5586 Store it in this type and in the variants. */
5588 TYPE_FIELDS (t) = fieldlist;
5590 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5592 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5593 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5594 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5595 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5598 /* If this was supposed to be a transparent union, but we can't
5599 make it one, warn and turn off the flag. */
5600 if (TREE_CODE (t) == UNION_TYPE
5601 && TYPE_TRANSPARENT_UNION (t)
5602 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5604 TYPE_TRANSPARENT_UNION (t) = 0;
5605 warning ("union cannot be made transparent");
5608 /* If this structure or union completes the type of any previous
5609 variable declaration, lay it out and output its rtl. */
5611 if (current_binding_level->n_incomplete != 0)
5614 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5616 if (TYPE_MAIN_VARIANT (TREE_TYPE (decl)) == TYPE_MAIN_VARIANT (t)
5617 && TREE_CODE (decl) != TYPE_DECL)
5619 layout_decl (decl, 0);
5620 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5621 maybe_objc_check_decl (decl);
5622 rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0);
5625 --current_binding_level->n_incomplete;
5627 else if (!COMPLETE_TYPE_P (TREE_TYPE (decl))
5628 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5630 tree element = TREE_TYPE (decl);
5631 while (TREE_CODE (element) == ARRAY_TYPE)
5632 element = TREE_TYPE (element);
5634 layout_array_type (TREE_TYPE (decl));
5639 /* Finish debugging output for this type. */
5640 rest_of_type_compilation (t, toplevel);
5645 /* Lay out the type T, and its element type, and so on. */
5648 layout_array_type (t)
5651 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5652 layout_array_type (TREE_TYPE (t));
5656 /* Begin compiling the definition of an enumeration type.
5657 NAME is its name (or null if anonymous).
5658 Returns the type object, as yet incomplete.
5659 Also records info about it so that build_enumerator
5660 may be used to declare the individual values as they are read. */
5666 register tree enumtype = 0;
5668 /* If this is the real definition for a previous forward reference,
5669 fill in the contents in the same object that used to be the
5670 forward reference. */
5673 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5675 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5677 enumtype = make_node (ENUMERAL_TYPE);
5678 pushtag (name, enumtype);
5681 C_TYPE_BEING_DEFINED (enumtype) = 1;
5683 if (TYPE_VALUES (enumtype) != 0)
5685 /* This enum is a named one that has been declared already. */
5686 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5688 /* Completely replace its old definition.
5689 The old enumerators remain defined, however. */
5690 TYPE_VALUES (enumtype) = 0;
5693 enum_next_value = integer_zero_node;
5696 if (flag_short_enums)
5697 TYPE_PACKED (enumtype) = 1;
5702 /* After processing and defining all the values of an enumeration type,
5703 install their decls in the enumeration type and finish it off.
5704 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5705 and ATTRIBUTES are the specified attributes.
5706 Returns ENUMTYPE. */
5709 finish_enum (enumtype, values, attributes)
5714 register tree pair, tem;
5715 tree minnode = 0, maxnode = 0, enum_value_type;
5716 int precision, unsign;
5717 int toplevel = (global_binding_level == current_binding_level);
5719 if (in_parm_level_p ())
5720 warning ("enum defined inside parms");
5722 decl_attributes (enumtype, attributes, NULL_TREE);
5724 /* Calculate the maximum value of any enumerator in this type. */
5726 if (values == error_mark_node)
5727 minnode = maxnode = integer_zero_node;
5730 minnode = maxnode = TREE_VALUE (values);
5731 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5733 tree value = TREE_VALUE (pair);
5734 if (tree_int_cst_lt (maxnode, value))
5736 if (tree_int_cst_lt (value, minnode))
5741 /* Construct the final type of this enumeration. It is the same
5742 as one of the integral types - the narrowest one that fits, except
5743 that normally we only go as narrow as int - and signed iff any of
5744 the values are negative. */
5745 unsign = (tree_int_cst_sgn (minnode) >= 0);
5746 precision = MAX (min_precision (minnode, unsign),
5747 min_precision (maxnode, unsign));
5748 if (!TYPE_PACKED (enumtype))
5749 precision = MAX (precision, TYPE_PRECISION (integer_type_node));
5750 if (type_for_size (precision, unsign) == 0)
5752 warning ("enumeration values exceed range of largest integer");
5753 precision = TYPE_PRECISION (long_long_integer_type_node);
5756 if (precision == TYPE_PRECISION (integer_type_node))
5757 enum_value_type = type_for_size (precision, 0);
5759 enum_value_type = enumtype;
5761 TYPE_MIN_VALUE (enumtype) = minnode;
5762 TYPE_MAX_VALUE (enumtype) = maxnode;
5763 TYPE_PRECISION (enumtype) = precision;
5764 TREE_UNSIGNED (enumtype) = unsign;
5765 TYPE_SIZE (enumtype) = 0;
5766 layout_type (enumtype);
5768 if (values != error_mark_node)
5770 /* Change the type of the enumerators to be the enum type. We
5771 need to do this irrespective of the size of the enum, for
5772 proper type checking. Replace the DECL_INITIALs of the
5773 enumerators, and the value slots of the list, with copies
5774 that have the enum type; they cannot be modified in place
5775 because they may be shared (e.g. integer_zero_node) Finally,
5776 change the purpose slots to point to the names of the decls. */
5777 for (pair = values; pair; pair = TREE_CHAIN (pair))
5779 tree enu = TREE_PURPOSE (pair);
5781 TREE_TYPE (enu) = enumtype;
5782 DECL_SIZE (enu) = TYPE_SIZE (enumtype);
5783 DECL_SIZE_UNIT (enu) = TYPE_SIZE_UNIT (enumtype);
5784 DECL_ALIGN (enu) = TYPE_ALIGN (enumtype);
5785 DECL_USER_ALIGN (enu) = TYPE_USER_ALIGN (enumtype);
5786 DECL_MODE (enu) = TYPE_MODE (enumtype);
5788 /* The ISO C Standard mandates enumerators to have type int,
5789 even though the underlying type of an enum type is
5790 unspecified. Here we convert any enumerators that fit in
5791 an int to type int, to avoid promotions to unsigned types
5792 when comparing integers with enumerators that fit in the
5793 int range. When -pedantic is given, build_enumerator()
5794 would have already taken care of those that don't fit. */
5795 if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
5796 DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
5798 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5800 TREE_PURPOSE (pair) = DECL_NAME (enu);
5801 TREE_VALUE (pair) = DECL_INITIAL (enu);
5804 TYPE_VALUES (enumtype) = values;
5807 /* Fix up all variant types of this enum type. */
5808 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5810 if (tem == enumtype)
5812 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5813 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5814 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5815 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5816 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5817 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5818 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5819 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5820 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5821 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5824 /* Finish debugging output for this type. */
5825 rest_of_type_compilation (enumtype, toplevel);
5830 /* Build and install a CONST_DECL for one value of the
5831 current enumeration type (one that was begun with start_enum).
5832 Return a tree-list containing the CONST_DECL and its value.
5833 Assignment of sequential values by default is handled here. */
5836 build_enumerator (name, value)
5839 register tree decl, type;
5841 /* Validate and default VALUE. */
5843 /* Remove no-op casts from the value. */
5845 STRIP_TYPE_NOPS (value);
5849 if (TREE_CODE (value) == INTEGER_CST)
5851 value = default_conversion (value);
5852 constant_expression_warning (value);
5856 error ("enumerator value for `%s' not integer constant",
5857 IDENTIFIER_POINTER (name));
5862 /* Default based on previous value. */
5863 /* It should no longer be possible to have NON_LVALUE_EXPR
5867 value = enum_next_value;
5869 error ("overflow in enumeration values");
5872 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5874 pedwarn ("ISO C restricts enumerator values to range of `int'");
5875 value = convert (integer_type_node, value);
5878 /* Set basis for default for next value. */
5879 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5880 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5882 /* Now create a declaration for the enum value name. */
5884 type = TREE_TYPE (value);
5885 type = type_for_size (MAX (TYPE_PRECISION (type),
5886 TYPE_PRECISION (integer_type_node)),
5888 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
5889 && TREE_UNSIGNED (type)));
5891 decl = build_decl (CONST_DECL, name, type);
5892 DECL_INITIAL (decl) = convert (type, value);
5895 return tree_cons (decl, value, NULL_TREE);
5899 /* Create the FUNCTION_DECL for a function definition.
5900 DECLSPECS, DECLARATOR, PREFIX_ATTRIBUTES and ATTRIBUTES are the parts of
5901 the declaration; they describe the function's name and the type it returns,
5902 but twisted together in a fashion that parallels the syntax of C.
5904 This function creates a binding context for the function body
5905 as well as setting up the FUNCTION_DECL in current_function_decl.
5907 Returns 1 on success. If the DECLARATOR is not suitable for a function
5908 (it defines a datum instead), we return 0, which tells
5909 yyparse to report a parse error. */
5912 start_function (declspecs, declarator, prefix_attributes, attributes)
5913 tree declarator, declspecs, prefix_attributes, attributes;
5915 tree decl1, old_decl;
5917 int old_immediate_size_expand = immediate_size_expand;
5919 current_function_returns_value = 0; /* Assume, until we see it does. */
5920 current_function_returns_null = 0;
5921 warn_about_return_type = 0;
5922 current_extern_inline = 0;
5923 c_function_varargs = 0;
5925 shadowed_labels = 0;
5927 /* Don't expand any sizes in the return type of the function. */
5928 immediate_size_expand = 0;
5930 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
5932 /* If the declarator is not suitable for a function definition,
5933 cause a syntax error. */
5936 immediate_size_expand = old_immediate_size_expand;
5940 decl_attributes (decl1, prefix_attributes, attributes);
5942 announce_function (decl1);
5944 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5946 error ("return type is an incomplete type");
5947 /* Make it return void instead. */
5949 = build_function_type (void_type_node,
5950 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5953 if (warn_about_return_type)
5954 pedwarn_c99 ("return type defaults to `int'");
5956 /* Save the parm names or decls from this function's declarator
5957 where store_parm_decls will find them. */
5958 current_function_parms = last_function_parms;
5959 current_function_parm_tags = last_function_parm_tags;
5961 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5962 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5963 DECL_INITIAL (decl1) = error_mark_node;
5965 /* If this definition isn't a prototype and we had a prototype declaration
5966 before, copy the arg type info from that prototype.
5967 But not if what we had before was a builtin function. */
5968 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5969 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5970 && !DECL_BUILT_IN (old_decl)
5971 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5972 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5973 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5975 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5976 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
5977 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
5980 /* If there is no explicit declaration, look for any out-of-scope implicit
5983 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
5985 /* Optionally warn of old-fashioned def with no previous prototype. */
5986 if (warn_strict_prototypes
5987 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5988 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
5989 warning ("function declaration isn't a prototype");
5990 /* Optionally warn of any global def with no previous prototype. */
5991 else if (warn_missing_prototypes
5992 && TREE_PUBLIC (decl1)
5993 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0)
5994 && ! MAIN_NAME_P (DECL_NAME (decl1)))
5995 warning_with_decl (decl1, "no previous prototype for `%s'");
5996 /* Optionally warn of any def with no previous prototype
5997 if the function has already been used. */
5998 else if (warn_missing_prototypes
5999 && old_decl != 0 && TREE_USED (old_decl)
6000 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6001 warning_with_decl (decl1,
6002 "`%s' was used with no prototype before its definition");
6003 /* Optionally warn of any global def with no previous declaration. */
6004 else if (warn_missing_declarations
6005 && TREE_PUBLIC (decl1)
6007 && ! MAIN_NAME_P (DECL_NAME (decl1)))
6008 warning_with_decl (decl1, "no previous declaration for `%s'");
6009 /* Optionally warn of any def with no previous declaration
6010 if the function has already been used. */
6011 else if (warn_missing_declarations
6012 && old_decl != 0 && TREE_USED (old_decl)
6013 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
6014 warning_with_decl (decl1,
6015 "`%s' was used with no declaration before its definition");
6017 /* This is a definition, not a reference.
6018 So normally clear DECL_EXTERNAL.
6019 However, `extern inline' acts like a declaration
6020 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6021 DECL_EXTERNAL (decl1) = current_extern_inline;
6023 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
6024 SET_DEFAULT_DECL_ATTRIBUTES (decl1, attributes);
6027 /* This function exists in static storage.
6028 (This does not mean `static' in the C sense!) */
6029 TREE_STATIC (decl1) = 1;
6031 /* A nested function is not global. */
6032 if (current_function_decl != 0)
6033 TREE_PUBLIC (decl1) = 0;
6035 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6036 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
6041 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6042 != integer_type_node)
6043 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
6045 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
6046 args = TREE_CHAIN (args))
6048 tree type = args ? TREE_VALUE (args) : 0;
6050 if (type == void_type_node)
6057 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6058 pedwarn_with_decl (decl1,
6059 "first argument of `%s' should be `int'");
6063 if (TREE_CODE (type) != POINTER_TYPE
6064 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6065 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6067 pedwarn_with_decl (decl1,
6068 "second argument of `%s' should be `char **'");
6072 if (TREE_CODE (type) != POINTER_TYPE
6073 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6074 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6076 pedwarn_with_decl (decl1,
6077 "third argument of `%s' should probably be `char **'");
6082 /* It is intentional that this message does not mention the third
6083 argument, which is warned for only pedantically, because it's
6084 blessed by mention in an appendix of the standard. */
6085 if (argct > 0 && (argct < 2 || argct > 3))
6086 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
6088 if (argct == 3 && pedantic)
6089 pedwarn_with_decl (decl1, "third argument of `%s' is deprecated");
6091 if (! TREE_PUBLIC (decl1))
6092 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
6095 /* Record the decl so that the function name is defined.
6096 If we already have a decl for this name, and it is a FUNCTION_DECL,
6097 use the old decl. */
6099 current_function_decl = pushdecl (decl1);
6102 declare_parm_level (1);
6103 current_binding_level->subblocks_tag_transparent = 1;
6105 make_function_rtl (current_function_decl);
6107 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6108 /* Promote the value to int before returning it. */
6109 if (C_PROMOTING_INTEGER_TYPE_P (restype))
6111 /* It retains unsignedness if traditional
6112 or if not really getting wider. */
6113 if (TREE_UNSIGNED (restype)
6114 && (flag_traditional
6115 || (TYPE_PRECISION (restype)
6116 == TYPE_PRECISION (integer_type_node))))
6117 restype = unsigned_type_node;
6119 restype = integer_type_node;
6121 DECL_RESULT (current_function_decl)
6122 = build_decl (RESULT_DECL, NULL_TREE, restype);
6124 /* If this fcn was already referenced via a block-scope `extern' decl
6125 (or an implicit decl), propagate certain information about the usage. */
6126 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6127 TREE_ADDRESSABLE (current_function_decl) = 1;
6129 immediate_size_expand = old_immediate_size_expand;
6134 /* Record that this function is going to be a varargs function.
6135 This is called before store_parm_decls, which is too early
6136 to call mark_varargs directly. */
6141 c_function_varargs = 1;
6144 /* Store the parameter declarations into the current function declaration.
6145 This is called after parsing the parameter declarations, before
6146 digesting the body of the function.
6148 For an old-style definition, modify the function's type
6149 to specify at least the number of arguments. */
6154 register tree fndecl = current_function_decl;
6157 /* This is either a chain of PARM_DECLs (if a prototype was used)
6158 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6159 tree specparms = current_function_parms;
6161 /* This is a list of types declared among parms in a prototype. */
6162 tree parmtags = current_function_parm_tags;
6164 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6165 register tree parmdecls = getdecls ();
6167 /* This is a chain of any other decls that came in among the parm
6168 declarations. If a parm is declared with enum {foo, bar} x;
6169 then CONST_DECLs for foo and bar are put here. */
6172 /* Nonzero if this definition is written with a prototype. */
6175 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6177 /* This case is when the function was defined with an ANSI prototype.
6178 The parms already have decls, so we need not do anything here
6179 except record them as in effect
6180 and complain if any redundant old-style parm decls were written. */
6191 error_with_decl (fndecl,
6192 "parm types given both in parmlist and separately");
6193 /* Get rid of the erroneous decls; don't keep them on
6194 the list of parms, since they might not be PARM_DECLs. */
6195 for (decl = current_binding_level->names;
6196 decl; decl = TREE_CHAIN (decl))
6197 if (DECL_NAME (decl))
6198 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6199 for (link = current_binding_level->shadowed;
6200 link; link = TREE_CHAIN (link))
6201 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6202 current_binding_level->names = 0;
6203 current_binding_level->shadowed = 0;
6206 specparms = nreverse (specparms);
6207 for (parm = specparms; parm; parm = next)
6209 next = TREE_CHAIN (parm);
6210 if (TREE_CODE (parm) == PARM_DECL)
6212 if (DECL_NAME (parm) == 0)
6213 error_with_decl (parm, "parameter name omitted");
6214 else if (TREE_CODE (TREE_TYPE (parm)) != ERROR_MARK
6215 && VOID_TYPE_P (TREE_TYPE (parm)))
6217 error_with_decl (parm, "parameter `%s' declared void");
6218 /* Change the type to error_mark_node so this parameter
6219 will be ignored by assign_parms. */
6220 TREE_TYPE (parm) = error_mark_node;
6226 /* If we find an enum constant or a type tag,
6227 put it aside for the moment. */
6228 TREE_CHAIN (parm) = 0;
6229 others = chainon (others, parm);
6233 /* Get the decls in their original chain order
6234 and record in the function. */
6235 DECL_ARGUMENTS (fndecl) = getdecls ();
6238 /* If this function takes a variable number of arguments,
6239 add a phony parameter to the end of the parm list,
6240 to represent the position of the first unnamed argument. */
6241 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6244 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6245 /* Let's hope the address of the unnamed parm
6246 won't depend on its type. */
6247 TREE_TYPE (dummy) = integer_type_node;
6248 DECL_ARG_TYPE (dummy) = integer_type_node;
6249 DECL_ARGUMENTS (fndecl) = chainon (DECL_ARGUMENTS (fndecl), dummy);
6253 /* Now pushdecl the enum constants. */
6254 for (parm = others; parm; parm = next)
6256 next = TREE_CHAIN (parm);
6257 if (DECL_NAME (parm) == 0)
6259 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6261 else if (TREE_CODE (parm) != PARM_DECL)
6265 storetags (chainon (parmtags, gettags ()));
6269 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6270 each with a parm name as the TREE_VALUE.
6272 PARMDECLS is a chain of declarations for parameters.
6273 Warning! It can also contain CONST_DECLs which are not parameters
6274 but are names of enumerators of any enum types
6275 declared among the parameters.
6277 First match each formal parameter name with its declaration.
6278 Associate decls with the names and store the decls
6279 into the TREE_PURPOSE slots. */
6281 /* We use DECL_WEAK as a flag to show which parameters have been
6282 seen already since it is not used on PARM_DECL or CONST_DECL. */
6283 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6284 DECL_WEAK (parm) = 0;
6286 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6288 register tree tail, found = NULL;
6290 if (TREE_VALUE (parm) == 0)
6292 error_with_decl (fndecl,
6293 "parameter name missing from parameter list");
6294 TREE_PURPOSE (parm) = 0;
6298 /* See if any of the parmdecls specifies this parm by name.
6299 Ignore any enumerator decls. */
6300 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6301 if (DECL_NAME (tail) == TREE_VALUE (parm)
6302 && TREE_CODE (tail) == PARM_DECL)
6308 /* If declaration already marked, we have a duplicate name.
6309 Complain, and don't use this decl twice. */
6310 if (found && DECL_WEAK (found))
6312 error_with_decl (found, "multiple parameters named `%s'");
6316 /* If the declaration says "void", complain and ignore it. */
6317 if (found && VOID_TYPE_P (TREE_TYPE (found)))
6319 error_with_decl (found, "parameter `%s' declared void");
6320 TREE_TYPE (found) = integer_type_node;
6321 DECL_ARG_TYPE (found) = integer_type_node;
6322 layout_decl (found, 0);
6325 /* Traditionally, a parm declared float is actually a double. */
6326 if (found && flag_traditional
6327 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6329 TREE_TYPE (found) = double_type_node;
6330 DECL_ARG_TYPE (found) = double_type_node;
6331 layout_decl (found, 0);
6334 /* If no declaration found, default to int. */
6337 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6339 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6340 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6341 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6343 pedwarn_with_decl (found, "type of `%s' defaults to `int'");
6344 else if (extra_warnings)
6345 warning_with_decl (found, "type of `%s' defaults to `int'");
6349 TREE_PURPOSE (parm) = found;
6351 /* Mark this decl as "already found". */
6352 DECL_WEAK (found) = 1;
6355 /* Put anything which is on the parmdecls chain and which is
6356 not a PARM_DECL onto the list NONPARMS. (The types of
6357 non-parm things which might appear on the list include
6358 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6359 any actual PARM_DECLs not matched with any names. */
6362 for (parm = parmdecls; parm;)
6364 tree next = TREE_CHAIN (parm);
6365 TREE_CHAIN (parm) = 0;
6367 if (TREE_CODE (parm) != PARM_DECL)
6368 nonparms = chainon (nonparms, parm);
6371 /* Complain about args with incomplete types. */
6372 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6374 error_with_decl (parm, "parameter `%s' has incomplete type");
6375 TREE_TYPE (parm) = error_mark_node;
6378 if (! DECL_WEAK (parm))
6380 error_with_decl (parm,
6381 "declaration for parameter `%s' but no such parameter");
6382 /* Pretend the parameter was not missing.
6383 This gets us to a standard state and minimizes
6384 further error messages. */
6386 = chainon (specparms,
6387 tree_cons (parm, NULL_TREE, NULL_TREE));
6394 /* Chain the declarations together in the order of the list of
6395 names. Store that chain in the function decl, replacing the
6398 DECL_ARGUMENTS (fndecl) = 0;
6401 for (last = 0; parm; parm = TREE_CHAIN (parm))
6402 if (TREE_PURPOSE (parm))
6405 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6407 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6408 last = TREE_PURPOSE (parm);
6409 TREE_CHAIN (last) = 0;
6413 /* If there was a previous prototype,
6414 set the DECL_ARG_TYPE of each argument according to
6415 the type previously specified, and report any mismatches. */
6417 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6420 for (parm = DECL_ARGUMENTS (fndecl),
6421 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6422 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6423 != void_type_node));
6424 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6426 if (parm == 0 || type == 0
6427 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6429 error ("number of arguments doesn't match prototype");
6430 error_with_file_and_line (current_function_prototype_file,
6431 current_function_prototype_line,
6432 "prototype declaration");
6435 /* Type for passing arg must be consistent
6436 with that declared for the arg. */
6437 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
6439 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6440 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6442 /* Adjust argument to match prototype. E.g. a previous
6443 `int foo(float);' prototype causes
6444 `int foo(x) float x; {...}' to be treated like
6445 `int foo(float x) {...}'. This is particularly
6446 useful for argument types like uid_t. */
6447 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6449 if (PROMOTE_PROTOTYPES
6450 && (TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
6451 || TREE_CODE (TREE_TYPE (parm)) == ENUMERAL_TYPE)
6452 && TYPE_PRECISION (TREE_TYPE (parm))
6453 < TYPE_PRECISION (integer_type_node))
6454 DECL_ARG_TYPE (parm) = integer_type_node;
6458 pedwarn ("promoted argument `%s' doesn't match prototype",
6459 IDENTIFIER_POINTER (DECL_NAME (parm)));
6460 warning_with_file_and_line
6461 (current_function_prototype_file,
6462 current_function_prototype_line,
6463 "prototype declaration");
6466 /* If -traditional, allow `int' argument to match
6467 `unsigned' prototype. */
6468 else if (! (flag_traditional
6469 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6470 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6472 error ("argument `%s' doesn't match prototype",
6473 IDENTIFIER_POINTER (DECL_NAME (parm)));
6474 error_with_file_and_line (current_function_prototype_file,
6475 current_function_prototype_line,
6476 "prototype declaration");
6480 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6483 /* Otherwise, create a prototype that would match. */
6487 tree actual = 0, last = 0, type;
6489 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6491 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6493 TREE_CHAIN (last) = type;
6498 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6500 TREE_CHAIN (last) = type;
6504 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6505 of the type of this function, but we need to avoid having this
6506 affect the types of other similarly-typed functions, so we must
6507 first force the generation of an identical (but separate) type
6508 node for the relevant function type. The new node we create
6509 will be a variant of the main variant of the original function
6512 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6514 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6517 /* Now store the final chain of decls for the arguments
6518 as the decl-chain of the current lexical scope.
6519 Put the enumerators in as well, at the front so that
6520 DECL_ARGUMENTS is not modified. */
6522 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6525 /* Make sure the binding level for the top of the function body
6526 gets a BLOCK if there are any in the function.
6527 Otherwise, the dbx output is wrong. */
6529 keep_next_if_subblocks = 1;
6531 /* ??? This might be an improvement,
6532 but needs to be thought about some more. */
6534 keep_next_level_flag = 1;
6537 /* Write a record describing this function definition to the prototypes
6538 file (if requested). */
6540 gen_aux_info_record (fndecl, 1, 0, prototype);
6542 /* Initialize the RTL code for the function. */
6544 init_function_start (fndecl, input_filename, lineno);
6546 /* Begin the statement tree for this function. */
6547 DECL_LANG_SPECIFIC (current_function_decl)
6548 =((struct lang_decl *) ggc_alloc (sizeof (struct lang_decl)));
6549 begin_stmt_tree (&DECL_SAVED_TREE (current_function_decl));
6551 /* This function is being processed in whole-function mode. */
6552 cfun->x_whole_function_mode_p = 1;
6554 /* Even though we're inside a function body, we still don't want to
6555 call expand_expr to calculate the size of a variable-sized array.
6556 We haven't necessarily assigned RTL to all variables yet, so it's
6557 not safe to try to expand expressions involving them. */
6558 immediate_size_expand = 0;
6559 cfun->x_dont_save_pending_sizes_p = 1;
6562 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6563 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6564 stands for an ellipsis in the identifier list.
6566 PARMLIST is the data returned by get_parm_info for the
6567 parmlist that follows the semicolon.
6569 We return a value of the same sort that get_parm_info returns,
6570 except that it describes the combination of identifiers and parmlist. */
6573 combine_parm_decls (specparms, parmlist, void_at_end)
6574 tree specparms, parmlist;
6577 register tree fndecl = current_function_decl;
6580 tree parmdecls = TREE_PURPOSE (parmlist);
6582 /* This is a chain of any other decls that came in among the parm
6583 declarations. They were separated already by get_parm_info,
6584 so we just need to keep them separate. */
6585 tree nonparms = TREE_VALUE (parmlist);
6589 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6590 DECL_WEAK (parm) = 0;
6592 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6594 register tree tail, found = NULL;
6596 /* See if any of the parmdecls specifies this parm by name. */
6597 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6598 if (DECL_NAME (tail) == TREE_VALUE (parm))
6604 /* If declaration already marked, we have a duplicate name.
6605 Complain, and don't use this decl twice. */
6606 if (found && DECL_WEAK (found))
6608 error_with_decl (found, "multiple parameters named `%s'");
6612 /* If the declaration says "void", complain and ignore it. */
6613 if (found && VOID_TYPE_P (TREE_TYPE (found)))
6615 error_with_decl (found, "parameter `%s' declared void");
6616 TREE_TYPE (found) = integer_type_node;
6617 DECL_ARG_TYPE (found) = integer_type_node;
6618 layout_decl (found, 0);
6621 /* Traditionally, a parm declared float is actually a double. */
6622 if (found && flag_traditional
6623 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6625 TREE_TYPE (found) = double_type_node;
6626 DECL_ARG_TYPE (found) = double_type_node;
6627 layout_decl (found, 0);
6630 /* If no declaration found, default to int. */
6633 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6635 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6636 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6637 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6638 error_with_decl (found, "type of parameter `%s' is not declared");
6642 TREE_PURPOSE (parm) = found;
6644 /* Mark this decl as "already found". */
6645 DECL_WEAK (found) = 1;
6648 /* Complain about any actual PARM_DECLs not matched with any names. */
6650 for (parm = parmdecls; parm;)
6652 tree next = TREE_CHAIN (parm);
6653 TREE_CHAIN (parm) = 0;
6655 /* Complain about args with incomplete types. */
6656 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6658 error_with_decl (parm, "parameter `%s' has incomplete type");
6659 TREE_TYPE (parm) = error_mark_node;
6662 if (! DECL_WEAK (parm))
6664 error_with_decl (parm,
6665 "declaration for parameter `%s' but no such parameter");
6666 /* Pretend the parameter was not missing.
6667 This gets us to a standard state and minimizes
6668 further error messages. */
6670 = chainon (specparms,
6671 tree_cons (parm, NULL_TREE, NULL_TREE));
6677 /* Chain the declarations together in the order of the list of names.
6678 At the same time, build up a list of their types, in reverse order. */
6684 for (last = 0; parm; parm = TREE_CHAIN (parm))
6685 if (TREE_PURPOSE (parm))
6688 parmdecls = TREE_PURPOSE (parm);
6690 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6691 last = TREE_PURPOSE (parm);
6692 TREE_CHAIN (last) = 0;
6694 types = tree_cons (NULL_TREE, TREE_TYPE (parm), types);
6699 return tree_cons (parmdecls, nonparms,
6700 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
6702 return tree_cons (parmdecls, nonparms, nreverse (types));
6705 /* Finish up a function declaration and compile that function
6706 all the way to assembler language output. The free the storage
6707 for the function definition.
6709 This is called after parsing the body of the function definition.
6711 NESTED is nonzero if the function being finished is nested in another. */
6714 finish_function (nested)
6717 register tree fndecl = current_function_decl;
6719 /* TREE_READONLY (fndecl) = 1;
6720 This caused &foo to be of type ptr-to-const-function
6721 which then got a warning when stored in a ptr-to-function variable. */
6724 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6726 /* Must mark the RESULT_DECL as being in this function. */
6728 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6730 /* Obey `register' declarations if `setjmp' is called in this fn. */
6731 if (flag_traditional && current_function_calls_setjmp)
6733 setjmp_protect (DECL_INITIAL (fndecl));
6734 setjmp_protect_args ();
6737 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6739 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6740 != integer_type_node)
6742 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6743 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6745 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
6749 #ifdef DEFAULT_MAIN_RETURN
6750 /* Make it so that `main' always returns success by default. */
6751 DEFAULT_MAIN_RETURN;
6754 c_expand_return (integer_zero_node);
6759 /* Tie off the statement tree for this function. */
6760 finish_stmt_tree (&DECL_SAVED_TREE (fndecl));
6761 /* Clear out memory we no longer need. */
6762 free_after_parsing (cfun);
6763 /* Since we never call rest_of_compilation, we never clear
6764 CFUN. Do so explicitly. */
6765 free_after_compilation (cfun);
6770 /* Generate RTL for the body of this function. */
6771 c_expand_body (fndecl, nested);
6772 /* Let the error reporting routines know that we're outside a
6773 function. For a nested function, this value is used in
6774 pop_c_function_context and then reset via pop_function_context. */
6775 current_function_decl = NULL;
6776 c_function_name_declared_p = 0;
6780 /* Generate the RTL for the body of FNDECL. If NESTED_P is non-zero,
6781 then we are already in the process of generating RTL for another
6785 c_expand_body (fndecl, nested_p)
6789 /* There's no reason to do any of the work here if we're only doing
6790 semantic analysis; this code just generates RTL. */
6791 if (flag_syntax_only)
6794 /* Squirrel away our current state. */
6796 push_function_context ();
6798 /* Initialize the RTL code for the function. */
6799 current_function_decl = fndecl;
6800 init_function_start (fndecl, input_filename, DECL_SOURCE_LINE (fndecl));
6802 /* This function is being processed in whole-function mode. */
6803 cfun->x_whole_function_mode_p = 1;
6805 /* Even though we're inside a function body, we still don't want to
6806 call expand_expr to calculate the size of a variable-sized array.
6807 We haven't necessarily assigned RTL to all variables yet, so it's
6808 not safe to try to expand expressions involving them. */
6809 immediate_size_expand = 0;
6810 cfun->x_dont_save_pending_sizes_p = 1;
6812 /* If this is a varargs function, inform function.c. */
6813 if (c_function_varargs)
6816 /* Set up parameters and prepare for return, for the function. */
6817 expand_function_start (fndecl, 0);
6819 /* If this function is `main', emit a call to `__main'
6820 to run global initializers, etc. */
6821 if (DECL_NAME (fndecl)
6822 && MAIN_NAME_P (DECL_NAME (fndecl))
6823 && DECL_CONTEXT (fndecl) == NULL_TREE)
6824 expand_main_function ();
6826 /* Generate the RTL for this function. */
6827 expand_stmt (DECL_SAVED_TREE (fndecl));
6828 /* Allow the body of the function to be garbage collected. */
6829 DECL_SAVED_TREE (fndecl) = NULL_TREE;
6831 /* We hard-wired immediate_size_expand to zero in start_function.
6832 expand_function_end will decrement this variable. So, we set the
6833 variable to one here, so that after the decrement it will remain
6835 immediate_size_expand = 1;
6837 /* Allow language dialects to perform special processing. */
6838 if (lang_expand_function_end)
6839 (*lang_expand_function_end) ();
6841 /* Generate rtl for function exit. */
6842 expand_function_end (input_filename, lineno, 0);
6844 /* If this is a nested function, protect the local variables in the stack
6845 above us from being collected while we're compiling this function. */
6847 ggc_push_context ();
6849 /* Run the optimizers and output the assembler code for this function. */
6850 rest_of_compilation (fndecl);
6852 /* Undo the GC context switch. */
6856 /* With just -W, complain only if function returns both with
6857 and without a value. */
6859 && current_function_returns_value
6860 && current_function_returns_null)
6861 warning ("this function may return with or without a value");
6863 /* If requested, warn about function definitions where the function will
6864 return a value (usually of some struct or union type) which itself will
6865 take up a lot of stack space. */
6867 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6869 tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6871 if (ret_type && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST
6872 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type),
6875 unsigned int size_as_int
6876 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type));
6878 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0)
6879 warning_with_decl (fndecl,
6880 "size of return value of `%s' is %u bytes",
6883 warning_with_decl (fndecl,
6884 "size of return value of `%s' is larger than %d bytes",
6889 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested_p)
6891 /* Stop pointing to the local nodes about to be freed.
6892 But DECL_INITIAL must remain nonzero so we know this
6893 was an actual function definition.
6894 For a nested function, this is done in pop_c_function_context.
6895 If rest_of_compilation set this to 0, leave it 0. */
6896 if (DECL_INITIAL (fndecl) != 0)
6897 DECL_INITIAL (fndecl) = error_mark_node;
6899 DECL_ARGUMENTS (fndecl) = 0;
6902 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6904 #ifndef ASM_OUTPUT_CONSTRUCTOR
6905 if (! flag_gnu_linker)
6906 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6909 assemble_constructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl)));
6912 if (DECL_STATIC_DESTRUCTOR (fndecl))
6914 #ifndef ASM_OUTPUT_DESTRUCTOR
6915 if (! flag_gnu_linker)
6916 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6919 assemble_destructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl)));
6924 /* Return to the enclosing function. */
6925 pop_function_context ();
6926 /* If the nested function was inline, write it out if that is
6928 if (!TREE_ASM_WRITTEN (fndecl) && TREE_ADDRESSABLE (fndecl))
6930 push_function_context ();
6931 output_inline_function (fndecl);
6932 pop_function_context ();
6938 /* Check the declarations given in a for-loop for satisfying the C99
6941 check_for_loop_decls ()
6947 /* If we get here, declarations have been used in a for loop without
6948 the C99 for loop scope. This doesn't make much sense, so don't
6950 error ("`for' loop initial declaration used outside C99 mode");
6953 /* C99 subclause 6.8.5 paragraph 3:
6955 [#3] The declaration part of a for statement shall only
6956 declare identifiers for objects having storage class auto or
6959 It isn't clear whether, in this sentence, "identifiers" binds to
6960 "shall only declare" or to "objects" - that is, whether all identifiers
6961 declared must be identifiers for objects, or whether the restriction
6962 only applies to those that are. (A question on this in comp.std.c
6963 in November 2000 received no answer.) We implement the strictest
6964 interpretation, to avoid creating an extension which later causes
6967 for (t = gettags (); t; t = TREE_CHAIN (t))
6969 if (TREE_PURPOSE (t) != 0)
6970 error ("`%s %s' declared in `for' loop initial declaration",
6971 (TREE_CODE (TREE_VALUE (t)) == RECORD_TYPE ? "struct"
6972 : TREE_CODE (TREE_VALUE (t)) == UNION_TYPE ? "union"
6974 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6976 for (t = getdecls (); t; t = TREE_CHAIN (t))
6978 if (TREE_CODE (t) != VAR_DECL && DECL_NAME (t))
6979 error_with_decl (t, "declaration of non-variable `%s' in `for' loop initial declaration");
6980 else if (TREE_STATIC (t))
6981 error_with_decl (t, "declaration of static variable `%s' in `for' loop initial declaration");
6982 else if (DECL_EXTERNAL (t))
6983 error_with_decl (t, "declaration of `extern' variable `%s' in `for' loop initial declaration");
6987 /* Save and restore the variables in this file and elsewhere
6988 that keep track of the progress of compilation of the current function.
6989 Used for nested functions. */
6991 struct c_language_function
6993 struct language_function base;
6995 tree shadowed_labels;
6998 int warn_about_return_type;
7000 struct binding_level *binding_level;
7003 /* Save and reinitialize the variables
7004 used during compilation of a C function. */
7007 push_c_function_context (f)
7010 struct c_language_function *p;
7011 p = ((struct c_language_function *)
7012 xmalloc (sizeof (struct c_language_function)));
7013 f->language = (struct language_function *) p;
7015 p->base.x_stmt_tree = c_stmt_tree;
7016 p->base.x_scope_stmt_stack = c_scope_stmt_stack;
7017 p->base.x_function_name_declared_p = c_function_name_declared_p;
7018 p->named_labels = named_labels;
7019 p->shadowed_labels = shadowed_labels;
7020 p->returns_value = current_function_returns_value;
7021 p->returns_null = current_function_returns_null;
7022 p->warn_about_return_type = warn_about_return_type;
7023 p->extern_inline = current_extern_inline;
7024 p->binding_level = current_binding_level;
7027 /* Restore the variables used during compilation of a C function. */
7030 pop_c_function_context (f)
7033 struct c_language_function *p
7034 = (struct c_language_function *) f->language;
7037 /* Bring back all the labels that were shadowed. */
7038 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
7039 if (DECL_NAME (TREE_VALUE (link)) != 0)
7040 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
7041 = TREE_VALUE (link);
7043 if (DECL_SAVED_INSNS (current_function_decl) == 0
7044 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
7046 /* Stop pointing to the local nodes about to be freed. */
7047 /* But DECL_INITIAL must remain nonzero so we know this
7048 was an actual function definition. */
7049 DECL_INITIAL (current_function_decl) = error_mark_node;
7050 DECL_ARGUMENTS (current_function_decl) = 0;
7053 c_stmt_tree = p->base.x_stmt_tree;
7054 c_scope_stmt_stack = p->base.x_scope_stmt_stack;
7055 c_function_name_declared_p = p->base.x_function_name_declared_p;
7056 named_labels = p->named_labels;
7057 shadowed_labels = p->shadowed_labels;
7058 current_function_returns_value = p->returns_value;
7059 current_function_returns_null = p->returns_null;
7060 warn_about_return_type = p->warn_about_return_type;
7061 current_extern_inline = p->extern_inline;
7062 current_binding_level = p->binding_level;
7068 /* Mark the language specific parts of F for GC. */
7071 mark_c_function_context (f)
7074 struct c_language_function *p
7075 = (struct c_language_function *) f->language;
7080 mark_c_language_function (&p->base);
7081 ggc_mark_tree (p->shadowed_labels);
7082 ggc_mark_tree (p->named_labels);
7083 mark_binding_level (&p->binding_level);
7086 /* Copy the DECL_LANG_SEPECIFIC data associated with NODE. */
7089 copy_lang_decl (decl)
7092 struct lang_decl *ld;
7094 if (!DECL_LANG_SPECIFIC (decl))
7097 ld = (struct lang_decl *) ggc_alloc (sizeof (struct lang_decl));
7098 memcpy ((char *) ld, (char *) DECL_LANG_SPECIFIC (decl),
7099 sizeof (struct lang_decl));
7100 DECL_LANG_SPECIFIC (decl) = ld;
7103 /* Mark the language specific bits in T for GC. */
7109 if (TREE_CODE (t) == IDENTIFIER_NODE)
7111 struct lang_identifier *i = (struct lang_identifier *) t;
7112 ggc_mark_tree (i->global_value);
7113 ggc_mark_tree (i->local_value);
7114 ggc_mark_tree (i->label_value);
7115 ggc_mark_tree (i->implicit_decl);
7116 ggc_mark_tree (i->error_locus);
7117 ggc_mark_tree (i->limbo_value);
7119 else if (TYPE_P (t) && TYPE_LANG_SPECIFIC (t))
7120 ggc_mark (TYPE_LANG_SPECIFIC (t));
7121 else if (DECL_P (t) && DECL_LANG_SPECIFIC (t))
7123 ggc_mark (DECL_LANG_SPECIFIC (t));
7124 c_mark_lang_decl (&DECL_LANG_SPECIFIC (t)->base);
7128 /* The functions below are required for functionality of doing
7129 function at once processing in the C front end. Currently these
7130 functions are not called from anywhere in the C front end, but as
7131 these changes continue, that will change. */
7133 /* Returns non-zero if the current statement is a full expression,
7134 i.e. temporaries created during that statement should be destroyed
7135 at the end of the statement. */
7138 stmts_are_full_exprs_p ()
7143 /* Returns the stmt_tree (if any) to which statements are currently
7144 being added. If there is no active statement-tree, NULL is
7148 current_stmt_tree ()
7150 return &c_stmt_tree;
7153 /* Returns the stack of SCOPE_STMTs for the current function. */
7156 current_scope_stmt_stack ()
7158 return &c_scope_stmt_stack;
7161 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
7165 anon_aggr_type_p (node)
7166 tree node ATTRIBUTE_UNUSED;
7171 /* Dummy function in place of callback used by C++. */
7174 extract_interface_info ()
7178 /* Return a new COMPOUND_STMT, after adding it to the current
7182 c_begin_compound_stmt ()
7186 /* Create the COMPOUND_STMT. */
7187 stmt = add_stmt (build_stmt (COMPOUND_STMT, NULL_TREE));
7188 /* If we haven't already declared __FUNCTION__ and its ilk then this
7189 is the opening curly brace of the function. Declare them now. */
7190 if (!c_function_name_declared_p)
7192 c_function_name_declared_p = 1;
7193 declare_function_name ();
7199 /* Expand T (a DECL_STMT) if it declares an entity not handled by the
7203 c_expand_decl_stmt (t)
7206 tree decl = DECL_STMT_DECL (t);
7208 /* Expand nested functions. */
7209 if (TREE_CODE (decl) == FUNCTION_DECL
7210 && DECL_CONTEXT (decl) == current_function_decl
7211 && DECL_SAVED_TREE (decl))
7212 c_expand_body (decl, /*nested_p=*/1);