1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
33 #include "tree-inline.h"
49 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
51 { NORMAL, /* Ordinary declaration */
52 FUNCDEF, /* Function definition */
53 PARM, /* Declaration of parm before function body */
54 FIELD, /* Declaration inside struct or union */
55 BITFIELD, /* Likewise but with specified width */
56 TYPENAME}; /* Typename (inside cast or sizeof) */
59 /* Nonzero if we have seen an invalid cross reference
60 to a struct, union, or enum, but not yet printed the message. */
62 tree pending_invalid_xref;
63 /* File and line to appear in the eventual error message. */
64 const char *pending_invalid_xref_file;
65 int pending_invalid_xref_line;
67 /* While defining an enum type, this is 1 plus the last enumerator
68 constant value. Note that will do not have to save this or `enum_overflow'
69 around nested function definition since such a definition could only
70 occur in an enum value expression and we don't use these variables in
73 static tree enum_next_value;
75 /* Nonzero means that there was overflow computing enum_next_value. */
77 static int enum_overflow;
79 /* Parsing a function declarator leaves a list of parameter names
80 or a chain or parameter decls here. */
82 static tree last_function_parms;
84 /* Parsing a function declarator leaves here a chain of structure
85 and enum types declared in the parmlist. */
87 static tree last_function_parm_tags;
89 /* After parsing the declarator that starts a function definition,
90 `start_function' puts here the list of parameter names or chain of decls.
91 `store_parm_decls' finds it here. */
93 static tree current_function_parms;
95 /* Similar, for last_function_parm_tags. */
96 static tree current_function_parm_tags;
98 /* Similar, for the file and line that the prototype came from if this is
99 an old-style definition. */
100 static const char *current_function_prototype_file;
101 static int current_function_prototype_line;
103 /* The current statement tree. */
105 static struct stmt_tree_s c_stmt_tree;
107 /* The current scope statement stack. */
109 static tree c_scope_stmt_stack;
111 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
112 that have names. Here so we can clear out their names' definitions
113 at the end of the function. */
115 static tree named_labels;
117 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
119 static tree shadowed_labels;
121 /* Nonzero when store_parm_decls is called indicates a varargs function.
122 Value not meaningful after store_parm_decls. */
124 static int c_function_varargs;
126 /* Set to 0 at beginning of a function definition, set to 1 if
127 a return statement that specifies a return value is seen. */
129 int current_function_returns_value;
131 /* Set to 0 at beginning of a function definition, set to 1 if
132 a return statement with no argument is seen. */
134 int current_function_returns_null;
136 /* Set to nonzero by `grokdeclarator' for a function
137 whose return type is defaulted, if warnings for this are desired. */
139 static int warn_about_return_type;
141 /* Nonzero when starting a function declared `extern inline'. */
143 static int current_extern_inline;
145 /* For each binding contour we allocate a binding_level structure
146 * which records the names defined in that contour.
149 * 1) one for each function definition,
150 * where internal declarations of the parameters appear.
151 * 2) one for each compound statement,
152 * to record its declarations.
154 * The current meaning of a name can be found by searching the levels from
155 * the current one out to the global one.
158 /* Note that the information in the `names' component of the global contour
159 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
163 /* A chain of _DECL nodes for all variables, constants, functions,
164 and typedef types. These are in the reverse of the order supplied.
168 /* A list of structure, union and enum definitions,
169 * for looking up tag names.
170 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
171 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
172 * or ENUMERAL_TYPE node.
176 /* For each level, a list of shadowed outer-level local definitions
177 to be restored when this level is popped.
178 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
179 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
182 /* For each level (except not the global one),
183 a chain of BLOCK nodes for all the levels
184 that were entered and exited one level down. */
187 /* The BLOCK node for this level, if one has been preallocated.
188 If 0, the BLOCK is allocated (if needed) when the level is popped. */
191 /* The binding level which this one is contained in (inherits from). */
192 struct binding_level *level_chain;
194 /* Nonzero for the level that holds the parameters of a function. */
197 /* Nonzero if this level "doesn't exist" for tags. */
198 char tag_transparent;
200 /* Nonzero if sublevels of this level "don't exist" for tags.
201 This is set in the parm level of a function definition
202 while reading the function body, so that the outermost block
203 of the function body will be tag-transparent. */
204 char subblocks_tag_transparent;
206 /* Nonzero means make a BLOCK for this level regardless of all else. */
209 /* Nonzero means make a BLOCK if this level has any subblocks. */
210 char keep_if_subblocks;
212 /* Number of decls in `names' that have incomplete
213 structure or union types. */
216 /* A list of decls giving the (reversed) specified order of parms,
217 not including any forward-decls in the parmlist.
218 This is so we can put the parms in proper order for assign_parms. */
222 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
224 /* The binding level currently in effect. */
226 static struct binding_level *current_binding_level;
228 /* A chain of binding_level structures awaiting reuse. */
230 static struct binding_level *free_binding_level;
232 /* The outermost binding level, for names of file scope.
233 This is created when the compiler is started and exists
234 through the entire run. */
236 static struct binding_level *global_binding_level;
238 /* Binding level structures are initialized by copying this one. */
240 static struct binding_level clear_binding_level
241 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, 0,
244 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
246 static int keep_next_level_flag;
248 /* Nonzero means make a BLOCK for the next level pushed
249 if it has subblocks. */
251 static int keep_next_if_subblocks;
253 /* The chain of outer levels of label scopes.
254 This uses the same data structure used for binding levels,
255 but it works differently: each link in the chain records
256 saved values of named_labels and shadowed_labels for
257 a label binding level outside the current one. */
259 static struct binding_level *label_level_chain;
261 /* Functions called automatically at the beginning and end of execution. */
263 tree static_ctors, static_dtors;
265 /* Forward declarations. */
267 static struct binding_level * make_binding_level PARAMS ((void));
268 static void mark_binding_level PARAMS ((void *));
269 static void clear_limbo_values PARAMS ((tree));
270 static int duplicate_decls PARAMS ((tree, tree, int));
271 static int redeclaration_error_message PARAMS ((tree, tree));
272 static void storedecls PARAMS ((tree));
273 static void storetags PARAMS ((tree));
274 static tree lookup_tag PARAMS ((enum tree_code, tree,
275 struct binding_level *, int));
276 static tree lookup_tag_reverse PARAMS ((tree));
277 static tree grokdeclarator PARAMS ((tree, tree, enum decl_context,
279 static tree grokparms PARAMS ((tree, int));
280 static void layout_array_type PARAMS ((tree));
281 static tree c_make_fname_decl PARAMS ((tree, int));
282 static void c_expand_body PARAMS ((tree, int, int));
284 /* C-specific option variables. */
286 /* Nonzero means allow type mismatches in conditional expressions;
287 just make their values `void'. */
289 int flag_cond_mismatch;
291 /* Nonzero means don't recognize the keyword `asm'. */
295 /* Nonzero means do some things the same way PCC does. */
297 int flag_traditional;
299 /* Nonzero means enable C89 Amendment 1 features. */
303 /* Nonzero means use the ISO C99 dialect of C. */
307 /* Nonzero means that we have builtin functions, and main is an int */
311 /* Nonzero means add default format_arg attributes for functions not
314 int flag_noniso_default_format_attributes = 1;
316 /* Nonzero means to allow single precision math even if we're generally
317 being traditional. */
318 int flag_allow_single_precision = 0;
320 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
322 int flag_signed_bitfields = 1;
323 int explicit_flag_signed_bitfields = 0;
325 /* Nonzero means warn about use of implicit int. */
327 int warn_implicit_int;
329 /* Nonzero means warn about usage of long long when `-pedantic'. */
331 int warn_long_long = 1;
333 /* Nonzero means message about use of implicit function declarations;
334 1 means warning; 2 means error. */
336 int mesg_implicit_function_declaration = -1;
338 /* Nonzero means give string constants the type `const char *'
339 to get extra warnings from them. These warnings will be too numerous
340 to be useful, except in thoroughly ANSIfied programs. */
342 int flag_const_strings;
344 /* Nonzero means warn about pointer casts that can drop a type qualifier
345 from the pointer target type. */
349 /* Nonzero means warn when casting a function call to a type that does
350 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
351 when there is no previous declaration of sqrt or malloc. */
353 int warn_bad_function_cast;
355 /* Warn about functions which might be candidates for format attributes. */
357 int warn_missing_format_attribute;
359 /* Warn about traditional constructs whose meanings changed in ANSI C. */
361 int warn_traditional;
363 /* Nonzero means warn about sizeof(function) or addition/subtraction
364 of function pointers. */
366 int warn_pointer_arith;
368 /* Nonzero means warn for non-prototype function decls
369 or non-prototyped defs without previous prototype. */
371 int warn_strict_prototypes;
373 /* Nonzero means warn for any global function def
374 without separate previous prototype decl. */
376 int warn_missing_prototypes;
378 /* Nonzero means warn for any global function def
379 without separate previous decl. */
381 int warn_missing_declarations;
383 /* Nonzero means warn about multiple (redundant) decls for the same single
384 variable or function. */
386 int warn_redundant_decls = 0;
388 /* Nonzero means warn about extern declarations of objects not at
389 file-scope level and about *all* declarations of functions (whether
390 extern or static) not at file-scope level. Note that we exclude
391 implicit function declarations. To get warnings about those, use
394 int warn_nested_externs = 0;
396 /* Warn about a subscript that has type char. */
398 int warn_char_subscripts = 0;
400 /* Warn if a type conversion is done that might have confusing results. */
404 /* Warn if adding () is suggested. */
406 int warn_parentheses;
408 /* Warn if initializer is not completely bracketed. */
410 int warn_missing_braces;
412 /* Warn if main is suspicious. */
416 /* Warn about #pragma directives that are not recognised. */
418 int warn_unknown_pragmas = 0; /* Tri state variable. */
420 /* Warn about comparison of signed and unsigned values.
421 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
423 int warn_sign_compare = -1;
425 /* Warn about testing equality of floating point numbers. */
427 int warn_float_equal = 0;
429 /* Nonzero means warn about use of multicharacter literals. */
431 int warn_multichar = 1;
433 /* The variant of the C language being processed. */
435 c_language_kind c_language = clk_c;
437 /* Nonzero means `$' can be in an identifier. */
439 #ifndef DOLLARS_IN_IDENTIFIERS
440 #define DOLLARS_IN_IDENTIFIERS 1
442 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
444 /* Decode the string P as a language-specific option for C.
445 Return the number of strings consumed. Should not complain
446 if it does not recognise the option. */
449 c_decode_option (argc, argv)
450 int argc ATTRIBUTE_UNUSED;
453 int strings_processed;
456 strings_processed = cpp_handle_option (parse_in, argc, argv);
458 if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
460 warning ("-traditional is deprecated and may be removed");
461 flag_traditional = 1;
462 flag_writable_strings = 1;
464 else if (!strcmp (p, "-fallow-single-precision"))
465 flag_allow_single_precision = 1;
466 else if (!strcmp (p, "-fhosted") || !strcmp (p, "-fno-freestanding"))
471 else if (!strcmp (p, "-ffreestanding") || !strcmp (p, "-fno-hosted"))
475 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
479 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
481 flag_traditional = 0;
482 flag_writable_strings = 0;
484 else if (!strncmp (p, "-std=", 5))
486 /* Select the appropriate language standard. We currently
488 -std=iso9899:1990 same as -ansi
489 -std=iso9899:199409 ISO C as modified in amend. 1
490 -std=iso9899:1999 ISO C 99
491 -std=c89 same as -std=iso9899:1990
492 -std=c99 same as -std=iso9899:1999
493 -std=gnu89 default, iso9899:1990 + gnu extensions
494 -std=gnu99 iso9899:1999 + gnu extensions
496 const char *const argstart = &p[5];
498 if (!strcmp (argstart, "iso9899:1990")
499 || !strcmp (argstart, "c89"))
504 flag_traditional = 0;
505 flag_writable_strings = 0;
507 flag_no_nonansi_builtin = 1;
508 flag_noniso_default_format_attributes = 0;
511 else if (!strcmp (argstart, "iso9899:199409"))
516 else if (!strcmp (argstart, "iso9899:199x")
517 || !strcmp (argstart, "iso9899:1999")
518 || !strcmp (argstart, "c9x")
519 || !strcmp (argstart, "c99"))
521 flag_traditional = 0;
522 flag_writable_strings = 0;
524 flag_no_nonansi_builtin = 1;
525 flag_noniso_default_format_attributes = 0;
529 else if (!strcmp (argstart, "gnu89"))
531 flag_traditional = 0;
532 flag_writable_strings = 0;
534 flag_no_nonansi_builtin = 0;
535 flag_noniso_default_format_attributes = 1;
539 else if (!strcmp (argstart, "gnu9x") || !strcmp (argstart, "gnu99"))
541 flag_traditional = 0;
542 flag_writable_strings = 0;
544 flag_no_nonansi_builtin = 0;
545 flag_noniso_default_format_attributes = 1;
550 error ("unknown C standard `%s'", argstart);
552 else if (!strcmp (p, "-fdollars-in-identifiers"))
553 dollars_in_ident = 1;
554 else if (!strcmp (p, "-fno-dollars-in-identifiers"))
555 dollars_in_ident = 0;
556 else if (!strcmp (p, "-fsigned-char"))
557 flag_signed_char = 1;
558 else if (!strcmp (p, "-funsigned-char"))
559 flag_signed_char = 0;
560 else if (!strcmp (p, "-fno-signed-char"))
561 flag_signed_char = 0;
562 else if (!strcmp (p, "-fno-unsigned-char"))
563 flag_signed_char = 1;
564 else if (!strcmp (p, "-fsigned-bitfields")
565 || !strcmp (p, "-fno-unsigned-bitfields"))
567 flag_signed_bitfields = 1;
568 explicit_flag_signed_bitfields = 1;
570 else if (!strcmp (p, "-funsigned-bitfields")
571 || !strcmp (p, "-fno-signed-bitfields"))
573 flag_signed_bitfields = 0;
574 explicit_flag_signed_bitfields = 1;
576 else if (!strcmp (p, "-fshort-enums"))
577 flag_short_enums = 1;
578 else if (!strcmp (p, "-fno-short-enums"))
579 flag_short_enums = 0;
580 else if (!strcmp (p, "-fshort-wchar"))
581 flag_short_wchar = 1;
582 else if (!strcmp (p, "-fno-short-wchar"))
583 flag_short_wchar = 0;
584 else if (!strcmp (p, "-fcond-mismatch"))
585 flag_cond_mismatch = 1;
586 else if (!strcmp (p, "-fno-cond-mismatch"))
587 flag_cond_mismatch = 0;
588 else if (!strcmp (p, "-fshort-double"))
589 flag_short_double = 1;
590 else if (!strcmp (p, "-fno-short-double"))
591 flag_short_double = 0;
592 else if (!strcmp (p, "-fasm"))
594 else if (!strcmp (p, "-fno-asm"))
596 else if (!strcmp (p, "-fbuiltin"))
598 else if (!strcmp (p, "-fno-builtin"))
600 else if (!strncmp (p, "-fno-builtin-", strlen ("-fno-builtin-")))
601 disable_builtin_function (p + strlen ("-fno-builtin-"));
602 else if (p[0] == '-' && p[1] == 'f' && dump_switch_p (p + 2))
604 else if (!strcmp (p, "-ansi"))
606 else if (!strcmp (p, "-Werror-implicit-function-declaration"))
607 mesg_implicit_function_declaration = 2;
608 else if (!strcmp (p, "-Wimplicit-function-declaration"))
609 mesg_implicit_function_declaration = 1;
610 else if (!strcmp (p, "-Wno-implicit-function-declaration"))
611 mesg_implicit_function_declaration = 0;
612 else if (!strcmp (p, "-Wimplicit-int"))
613 warn_implicit_int = 1;
614 else if (!strcmp (p, "-Wno-implicit-int"))
615 warn_implicit_int = 0;
616 else if (!strcmp (p, "-Wimplicit"))
618 warn_implicit_int = 1;
619 if (mesg_implicit_function_declaration != 2)
620 mesg_implicit_function_declaration = 1;
622 else if (!strcmp (p, "-Wno-implicit"))
623 warn_implicit_int = 0, mesg_implicit_function_declaration = 0;
624 else if (!strcmp (p, "-Wlong-long"))
626 else if (!strcmp (p, "-Wno-long-long"))
628 else if (!strcmp (p, "-Wwrite-strings"))
629 flag_const_strings = 1;
630 else if (!strcmp (p, "-Wno-write-strings"))
631 flag_const_strings = 0;
632 else if (!strcmp (p, "-Wcast-qual"))
634 else if (!strcmp (p, "-Wno-cast-qual"))
636 else if (!strcmp (p, "-Wbad-function-cast"))
637 warn_bad_function_cast = 1;
638 else if (!strcmp (p, "-Wno-bad-function-cast"))
639 warn_bad_function_cast = 0;
640 else if (!strcmp (p, "-Wno-missing-noreturn"))
641 warn_missing_noreturn = 0;
642 else if (!strcmp (p, "-Wmissing-format-attribute"))
643 warn_missing_format_attribute = 1;
644 else if (!strcmp (p, "-Wno-missing-format-attribute"))
645 warn_missing_format_attribute = 0;
646 else if (!strcmp (p, "-Wpointer-arith"))
647 warn_pointer_arith = 1;
648 else if (!strcmp (p, "-Wno-pointer-arith"))
649 warn_pointer_arith = 0;
650 else if (!strcmp (p, "-Wstrict-prototypes"))
651 warn_strict_prototypes = 1;
652 else if (!strcmp (p, "-Wno-strict-prototypes"))
653 warn_strict_prototypes = 0;
654 else if (!strcmp (p, "-Wmissing-prototypes"))
655 warn_missing_prototypes = 1;
656 else if (!strcmp (p, "-Wno-missing-prototypes"))
657 warn_missing_prototypes = 0;
658 else if (!strcmp (p, "-Wmissing-declarations"))
659 warn_missing_declarations = 1;
660 else if (!strcmp (p, "-Wno-missing-declarations"))
661 warn_missing_declarations = 0;
662 else if (!strcmp (p, "-Wredundant-decls"))
663 warn_redundant_decls = 1;
664 else if (!strcmp (p, "-Wno-redundant-decls"))
665 warn_redundant_decls = 0;
666 else if (!strcmp (p, "-Wnested-externs"))
667 warn_nested_externs = 1;
668 else if (!strcmp (p, "-Wno-nested-externs"))
669 warn_nested_externs = 0;
670 else if (!strcmp (p, "-Wtraditional"))
671 warn_traditional = 1;
672 else if (!strcmp (p, "-Wno-traditional"))
673 warn_traditional = 0;
674 else if (!strncmp (p, "-Wformat=", 9))
675 set_Wformat (atoi (p + 9));
676 else if (!strcmp (p, "-Wformat"))
678 else if (!strcmp (p, "-Wno-format"))
680 else if (!strcmp (p, "-Wformat-y2k"))
682 else if (!strcmp (p, "-Wno-format-y2k"))
684 else if (!strcmp (p, "-Wformat-extra-args"))
685 warn_format_extra_args = 1;
686 else if (!strcmp (p, "-Wno-format-extra-args"))
687 warn_format_extra_args = 0;
688 else if (!strcmp (p, "-Wformat-nonliteral"))
689 warn_format_nonliteral = 1;
690 else if (!strcmp (p, "-Wno-format-nonliteral"))
691 warn_format_nonliteral = 0;
692 else if (!strcmp (p, "-Wformat-security"))
693 warn_format_security = 1;
694 else if (!strcmp (p, "-Wno-format-security"))
695 warn_format_security = 0;
696 else if (!strcmp (p, "-Wchar-subscripts"))
697 warn_char_subscripts = 1;
698 else if (!strcmp (p, "-Wno-char-subscripts"))
699 warn_char_subscripts = 0;
700 else if (!strcmp (p, "-Wconversion"))
702 else if (!strcmp (p, "-Wno-conversion"))
704 else if (!strcmp (p, "-Wparentheses"))
705 warn_parentheses = 1;
706 else if (!strcmp (p, "-Wno-parentheses"))
707 warn_parentheses = 0;
708 else if (!strcmp (p, "-Wreturn-type"))
709 warn_return_type = 1;
710 else if (!strcmp (p, "-Wno-return-type"))
711 warn_return_type = 0;
712 else if (!strcmp (p, "-Wsequence-point"))
713 warn_sequence_point = 1;
714 else if (!strcmp (p, "-Wno-sequence-point"))
715 warn_sequence_point = 0;
716 else if (!strcmp (p, "-Wcomment"))
717 ; /* cpp handles this one. */
718 else if (!strcmp (p, "-Wno-comment"))
719 ; /* cpp handles this one. */
720 else if (!strcmp (p, "-Wcomments"))
721 ; /* cpp handles this one. */
722 else if (!strcmp (p, "-Wno-comments"))
723 ; /* cpp handles this one. */
724 else if (!strcmp (p, "-Wtrigraphs"))
725 ; /* cpp handles this one. */
726 else if (!strcmp (p, "-Wno-trigraphs"))
727 ; /* cpp handles this one. */
728 else if (!strcmp (p, "-Wundef"))
729 ; /* cpp handles this one. */
730 else if (!strcmp (p, "-Wno-undef"))
731 ; /* cpp handles this one. */
732 else if (!strcmp (p, "-Wimport"))
733 ; /* cpp handles this one. */
734 else if (!strcmp (p, "-Wno-import"))
735 ; /* cpp handles this one. */
736 else if (!strcmp (p, "-Wmissing-braces"))
737 warn_missing_braces = 1;
738 else if (!strcmp (p, "-Wno-missing-braces"))
739 warn_missing_braces = 0;
740 else if (!strcmp (p, "-Wmain"))
742 else if (!strcmp (p, "-Wno-main"))
744 else if (!strcmp (p, "-Wsign-compare"))
745 warn_sign_compare = 1;
746 else if (!strcmp (p, "-Wno-sign-compare"))
747 warn_sign_compare = 0;
748 else if (!strcmp (p, "-Wfloat-equal"))
749 warn_float_equal = 1;
750 else if (!strcmp (p, "-Wno-float-equal"))
751 warn_float_equal = 0;
752 else if (!strcmp (p, "-Wmultichar"))
754 else if (!strcmp (p, "-Wno-multichar"))
756 else if (!strcmp (p, "-Wdiv-by-zero"))
757 warn_div_by_zero = 1;
758 else if (!strcmp (p, "-Wno-div-by-zero"))
759 warn_div_by_zero = 0;
760 else if (!strcmp (p, "-Wunknown-pragmas"))
761 /* Set to greater than 1, so that even unknown pragmas in system
762 headers will be warned about. */
763 warn_unknown_pragmas = 2;
764 else if (!strcmp (p, "-Wno-unknown-pragmas"))
765 warn_unknown_pragmas = 0;
766 else if (!strcmp (p, "-Wall"))
768 /* We save the value of warn_uninitialized, since if they put
769 -Wuninitialized on the command line, we need to generate a
770 warning about not using it without also specifying -O. */
771 if (warn_uninitialized != 1)
772 warn_uninitialized = 2;
773 warn_implicit_int = 1;
774 mesg_implicit_function_declaration = 1;
775 warn_return_type = 1;
779 warn_char_subscripts = 1;
780 warn_parentheses = 1;
781 warn_sequence_point = 1;
782 warn_missing_braces = 1;
783 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
784 it off only if it's not explicit. */
786 /* Only warn about unknown pragmas that are not in system headers. */
787 warn_unknown_pragmas = 1;
790 return strings_processed;
796 c_print_identifier (file, node, indent)
801 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
802 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
803 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
804 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
805 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
806 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
807 if (C_IS_RESERVED_WORD (node))
809 tree rid = ridpointers[C_RID_CODE (node)];
810 indent_to (file, indent + 4);
811 fprintf (file, "rid ");
812 fprintf (file, HOST_PTR_PRINTF, (void *)rid);
813 fprintf (file, " \"%s\"", IDENTIFIER_POINTER (rid));
817 /* Hook called at end of compilation to assume 1 elt
818 for a top-level tentative array defn that wasn't complete before. */
821 finish_incomplete_decl (decl)
824 if (TREE_CODE (decl) == VAR_DECL)
826 tree type = TREE_TYPE (decl);
827 if (type != error_mark_node
828 && TREE_CODE (type) == ARRAY_TYPE
829 && ! DECL_EXTERNAL (decl)
830 && TYPE_DOMAIN (type) == 0)
832 warning_with_decl (decl, "array `%s' assumed to have one element");
834 complete_array_type (type, NULL_TREE, 1);
836 layout_decl (decl, 0);
841 /* Create a new `struct binding_level'. */
843 static struct binding_level *
844 make_binding_level ()
847 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
850 /* Nonzero if we are currently in the global binding level. */
855 return current_binding_level == global_binding_level;
861 keep_next_level_flag = 1;
864 /* Nonzero if the current level needs to have a BLOCK made. */
869 return ((current_binding_level->keep_if_subblocks
870 && current_binding_level->blocks != 0)
871 || current_binding_level->keep
872 || current_binding_level->names != 0
873 || (current_binding_level->tags != 0
874 && !current_binding_level->tag_transparent));
877 /* Identify this binding level as a level of parameters.
878 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
879 But it turns out there is no way to pass the right value for
880 DEFINITION_FLAG, so we ignore it. */
883 declare_parm_level (definition_flag)
884 int definition_flag ATTRIBUTE_UNUSED;
886 current_binding_level->parm_flag = 1;
889 /* Nonzero if currently making parm declarations. */
894 return current_binding_level->parm_flag;
897 /* Enter a new binding level.
898 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
899 not for that of tags. */
902 pushlevel (tag_transparent)
905 struct binding_level *newlevel = NULL_BINDING_LEVEL;
907 /* If this is the top level of a function,
908 just make sure that NAMED_LABELS is 0. */
910 if (current_binding_level == global_binding_level)
915 /* Reuse or create a struct for this binding level. */
917 if (free_binding_level)
919 newlevel = free_binding_level;
920 free_binding_level = free_binding_level->level_chain;
924 newlevel = make_binding_level ();
927 /* Add this level to the front of the chain (stack) of levels that
930 *newlevel = clear_binding_level;
931 newlevel->tag_transparent
933 || (current_binding_level
934 ? current_binding_level->subblocks_tag_transparent
936 newlevel->level_chain = current_binding_level;
937 current_binding_level = newlevel;
938 newlevel->keep = keep_next_level_flag;
939 keep_next_level_flag = 0;
940 newlevel->keep_if_subblocks = keep_next_if_subblocks;
941 keep_next_if_subblocks = 0;
944 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
947 clear_limbo_values (block)
952 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
953 if (DECL_NAME (tem) != 0)
954 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
956 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
957 clear_limbo_values (tem);
960 /* Exit a binding level.
961 Pop the level off, and restore the state of the identifier-decl mappings
962 that were in effect when this level was entered.
964 If KEEP is nonzero, this level had explicit declarations, so
965 and create a "block" (a BLOCK node) for the level
966 to record its declarations and subblocks for symbol table output.
968 If FUNCTIONBODY is nonzero, this level is the body of a function,
969 so create a block as if KEEP were set and also clear out all
972 If REVERSE is nonzero, reverse the order of decls before putting
973 them into the BLOCK. */
976 poplevel (keep, reverse, functionbody)
982 /* The chain of decls was accumulated in reverse order.
983 Put it into forward order, just for cleanliness. */
985 tree tags = current_binding_level->tags;
986 tree subblocks = current_binding_level->blocks;
989 int block_previously_created;
991 keep |= current_binding_level->keep;
993 /* This warning is turned off because it causes warnings for
994 declarations like `extern struct foo *x'. */
996 /* Warn about incomplete structure types in this level. */
997 for (link = tags; link; link = TREE_CHAIN (link))
998 if (!COMPLETE_TYPE_P (TREE_VALUE (link)))
1000 tree type = TREE_VALUE (link);
1001 tree type_name = TYPE_NAME (type);
1002 char *id = IDENTIFIER_POINTER (TREE_CODE (type_name) == IDENTIFIER_NODE
1004 : DECL_NAME (type_name));
1005 switch (TREE_CODE (type))
1008 error ("`struct %s' incomplete in scope ending here", id);
1011 error ("`union %s' incomplete in scope ending here", id);
1014 error ("`enum %s' incomplete in scope ending here", id);
1020 /* Get the decls in the order they were written.
1021 Usually current_binding_level->names is in reverse order.
1022 But parameter decls were previously put in forward order. */
1025 current_binding_level->names
1026 = decls = nreverse (current_binding_level->names);
1028 decls = current_binding_level->names;
1030 /* Output any nested inline functions within this block
1031 if they weren't already output. */
1033 for (decl = decls; decl; decl = TREE_CHAIN (decl))
1034 if (TREE_CODE (decl) == FUNCTION_DECL
1035 && ! TREE_ASM_WRITTEN (decl)
1036 && DECL_INITIAL (decl) != 0
1037 && TREE_ADDRESSABLE (decl))
1039 /* If this decl was copied from a file-scope decl
1040 on account of a block-scope extern decl,
1041 propagate TREE_ADDRESSABLE to the file-scope decl.
1043 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1044 true, since then the decl goes through save_for_inline_copying. */
1045 if (DECL_ABSTRACT_ORIGIN (decl) != 0
1046 && DECL_ABSTRACT_ORIGIN (decl) != decl)
1047 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
1050 /* We used to warn about unused variables in expand_end_bindings,
1051 i.e. while generating RTL. But in function-at-a-time mode we may
1052 choose to never expand a function at all (e.g. auto inlining), so
1053 we do this explicitly now. */
1054 warn_about_unused_variables (getdecls ());
1056 /* If there were any declarations or structure tags in that level,
1057 or if this level is a function body,
1058 create a BLOCK to record them for the life of this function. */
1061 block_previously_created = (current_binding_level->this_block != 0);
1062 if (block_previously_created)
1063 block = current_binding_level->this_block;
1064 else if (keep || functionbody
1065 || (current_binding_level->keep_if_subblocks && subblocks != 0))
1066 block = make_node (BLOCK);
1069 BLOCK_VARS (block) = decls;
1070 BLOCK_SUBBLOCKS (block) = subblocks;
1073 /* In each subblock, record that this is its superior. */
1075 for (link = subblocks; link; link = TREE_CHAIN (link))
1076 BLOCK_SUPERCONTEXT (link) = block;
1078 /* Clear out the meanings of the local variables of this level. */
1080 for (link = decls; link; link = TREE_CHAIN (link))
1082 if (DECL_NAME (link) != 0)
1084 /* If the ident. was used or addressed via a local extern decl,
1085 don't forget that fact. */
1086 if (DECL_EXTERNAL (link))
1088 if (TREE_USED (link))
1089 TREE_USED (DECL_NAME (link)) = 1;
1090 if (TREE_ADDRESSABLE (link))
1091 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1093 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1097 /* Restore all name-meanings of the outer levels
1098 that were shadowed by this level. */
1100 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1101 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1103 /* If the level being exited is the top level of a function,
1104 check over all the labels, and clear out the current
1105 (function local) meanings of their names. */
1109 clear_limbo_values (block);
1111 /* If this is the top level block of a function,
1112 the vars are the function's parameters.
1113 Don't leave them in the BLOCK because they are
1114 found in the FUNCTION_DECL instead. */
1116 BLOCK_VARS (block) = 0;
1118 /* Clear out the definitions of all label names,
1119 since their scopes end here,
1120 and add them to BLOCK_VARS. */
1122 for (link = named_labels; link; link = TREE_CHAIN (link))
1124 tree label = TREE_VALUE (link);
1126 if (DECL_INITIAL (label) == 0)
1128 error_with_decl (label, "label `%s' used but not defined");
1129 /* Avoid crashing later. */
1130 define_label (input_filename, lineno,
1133 else if (warn_unused_label && !TREE_USED (label))
1134 warning_with_decl (label, "label `%s' defined but not used");
1135 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1137 /* Put the labels into the "variables" of the
1138 top-level block, so debugger can see them. */
1139 TREE_CHAIN (label) = BLOCK_VARS (block);
1140 BLOCK_VARS (block) = label;
1144 /* Pop the current level, and free the structure for reuse. */
1147 struct binding_level *level = current_binding_level;
1148 current_binding_level = current_binding_level->level_chain;
1150 level->level_chain = free_binding_level;
1151 free_binding_level = level;
1154 /* Dispose of the block that we just made inside some higher level. */
1156 DECL_INITIAL (current_function_decl) = block;
1159 if (!block_previously_created)
1160 current_binding_level->blocks
1161 = chainon (current_binding_level->blocks, block);
1163 /* If we did not make a block for the level just exited,
1164 any blocks made for inner levels
1165 (since they cannot be recorded as subblocks in that level)
1166 must be carried forward so they will later become subblocks
1167 of something else. */
1169 current_binding_level->blocks
1170 = chainon (current_binding_level->blocks, subblocks);
1172 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1173 binding contour so that they point to the appropriate construct, i.e.
1174 either to the current FUNCTION_DECL node, or else to the BLOCK node
1175 we just constructed.
1177 Note that for tagged types whose scope is just the formal parameter
1178 list for some function type specification, we can't properly set
1179 their TYPE_CONTEXTs here, because we don't have a pointer to the
1180 appropriate FUNCTION_TYPE node readily available to us. For those
1181 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1182 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1183 node which will represent the "scope" for these "parameter list local"
1187 for (link = tags; link; link = TREE_CHAIN (link))
1188 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1190 for (link = tags; link; link = TREE_CHAIN (link))
1191 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1194 TREE_USED (block) = 1;
1199 /* Insert BLOCK at the end of the list of subblocks of the
1200 current binding level. This is used when a BIND_EXPR is expanded,
1201 to handle the BLOCK node inside the BIND_EXPR. */
1204 insert_block (block)
1207 TREE_USED (block) = 1;
1208 current_binding_level->blocks
1209 = chainon (current_binding_level->blocks, block);
1212 /* Set the BLOCK node for the innermost scope
1213 (the one we are currently in). */
1219 current_binding_level->this_block = block;
1220 current_binding_level->names = chainon (current_binding_level->names,
1221 BLOCK_VARS (block));
1222 current_binding_level->blocks = chainon (current_binding_level->blocks,
1223 BLOCK_SUBBLOCKS (block));
1229 struct binding_level *newlevel;
1231 /* Reuse or create a struct for this binding level. */
1233 if (free_binding_level)
1235 newlevel = free_binding_level;
1236 free_binding_level = free_binding_level->level_chain;
1240 newlevel = make_binding_level ();
1243 /* Add this level to the front of the chain (stack) of label levels. */
1245 newlevel->level_chain = label_level_chain;
1246 label_level_chain = newlevel;
1248 newlevel->names = named_labels;
1249 newlevel->shadowed = shadowed_labels;
1251 shadowed_labels = 0;
1257 struct binding_level *level = label_level_chain;
1260 /* Clear out the definitions of the declared labels in this level.
1261 Leave in the list any ordinary, non-declared labels. */
1262 for (link = named_labels, prev = 0; link;)
1264 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1266 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1268 error_with_decl (TREE_VALUE (link),
1269 "label `%s' used but not defined");
1270 /* Avoid crashing later. */
1271 define_label (input_filename, lineno,
1272 DECL_NAME (TREE_VALUE (link)));
1274 else if (warn_unused_label && !TREE_USED (TREE_VALUE (link)))
1275 warning_with_decl (TREE_VALUE (link),
1276 "label `%s' defined but not used");
1277 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1279 /* Delete this element from the list. */
1280 link = TREE_CHAIN (link);
1282 TREE_CHAIN (prev) = link;
1284 named_labels = link;
1289 link = TREE_CHAIN (link);
1293 /* Bring back all the labels that were shadowed. */
1294 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1295 if (DECL_NAME (TREE_VALUE (link)) != 0)
1296 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1297 = TREE_VALUE (link);
1299 named_labels = chainon (named_labels, level->names);
1300 shadowed_labels = level->shadowed;
1302 /* Pop the current level, and free the structure for reuse. */
1303 label_level_chain = label_level_chain->level_chain;
1304 level->level_chain = free_binding_level;
1305 free_binding_level = level;
1308 /* Push a definition or a declaration of struct, union or enum tag "name".
1309 "type" should be the type node.
1310 We assume that the tag "name" is not already defined.
1312 Note that the definition may really be just a forward reference.
1313 In that case, the TYPE_SIZE will be zero. */
1316 pushtag (name, type)
1319 struct binding_level *b;
1321 /* Find the proper binding level for this type tag. */
1323 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1328 /* Record the identifier as the type's name if it has none. */
1330 if (TYPE_NAME (type) == 0)
1331 TYPE_NAME (type) = name;
1334 b->tags = tree_cons (name, type, b->tags);
1336 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1337 tagged type we just added to the current binding level. This fake
1338 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1339 to output a representation of a tagged type, and it also gives
1340 us a convenient place to record the "scope start" address for the
1343 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1345 /* An approximation for now, so we can tell this is a function-scope tag.
1346 This will be updated in poplevel. */
1347 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1350 /* Handle when a new declaration NEWDECL
1351 has the same name as an old one OLDDECL
1352 in the same binding contour.
1353 Prints an error message if appropriate.
1355 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1356 Otherwise, return 0.
1358 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1359 and OLDDECL is in an outer binding level and should thus not be changed. */
1362 duplicate_decls (newdecl, olddecl, different_binding_level)
1363 tree newdecl, olddecl;
1364 int different_binding_level;
1366 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1367 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1368 && DECL_INITIAL (newdecl) != 0);
1369 tree oldtype = TREE_TYPE (olddecl);
1370 tree newtype = TREE_TYPE (newdecl);
1373 if (DECL_P (olddecl))
1375 if (TREE_CODE (newdecl) == FUNCTION_DECL
1376 && TREE_CODE (olddecl) == FUNCTION_DECL
1377 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1379 if (DECL_DECLARED_INLINE_P (newdecl)
1380 && DECL_UNINLINABLE (newdecl)
1381 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1382 /* Already warned elsewhere. */;
1383 else if (DECL_DECLARED_INLINE_P (olddecl)
1384 && DECL_UNINLINABLE (olddecl)
1385 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1386 /* Already warned. */;
1387 else if (DECL_DECLARED_INLINE_P (newdecl)
1388 && ! DECL_DECLARED_INLINE_P (olddecl)
1389 && DECL_UNINLINABLE (olddecl)
1390 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1392 warning_with_decl (newdecl,
1393 "function `%s' redeclared as inline");
1394 warning_with_decl (olddecl,
1395 "previous declaration of function `%s' with attribute noinline");
1397 else if (DECL_DECLARED_INLINE_P (olddecl)
1398 && DECL_UNINLINABLE (newdecl)
1399 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1401 warning_with_decl (newdecl,
1402 "function `%s' redeclared with attribute noinline");
1403 warning_with_decl (olddecl,
1404 "previous declaration of function `%s' was inline");
1408 DECL_ATTRIBUTES (newdecl)
1409 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1412 if (TREE_CODE (newtype) == ERROR_MARK
1413 || TREE_CODE (oldtype) == ERROR_MARK)
1416 /* New decl is completely inconsistent with the old one =>
1417 tell caller to replace the old one.
1418 This is always an error except in the case of shadowing a builtin. */
1419 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1421 if (TREE_CODE (olddecl) == FUNCTION_DECL
1422 && (DECL_BUILT_IN (olddecl)
1423 || DECL_BUILT_IN_NONANSI (olddecl)))
1425 /* If you declare a built-in or predefined function name as static,
1426 the old definition is overridden,
1427 but optionally warn this was a bad choice of name. */
1428 if (!TREE_PUBLIC (newdecl))
1432 else if (DECL_BUILT_IN (olddecl))
1433 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1435 warning_with_decl (newdecl, "shadowing library function `%s'");
1437 /* Likewise, if the built-in is not ansi, then programs can
1438 override it even globally without an error. */
1439 else if (! DECL_BUILT_IN (olddecl))
1440 warning_with_decl (newdecl,
1441 "library function `%s' declared as non-function");
1443 else if (DECL_BUILT_IN_NONANSI (olddecl))
1444 warning_with_decl (newdecl,
1445 "built-in function `%s' declared as non-function");
1447 warning_with_decl (newdecl,
1448 "built-in function `%s' declared as non-function");
1452 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1453 error_with_decl (olddecl, "previous declaration of `%s'");
1459 /* For real parm decl following a forward decl,
1460 return 1 so old decl will be reused. */
1461 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1462 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1465 /* The new declaration is the same kind of object as the old one.
1466 The declarations may partially match. Print warnings if they don't
1467 match enough. Ultimately, copy most of the information from the new
1468 decl to the old one, and keep using the old one. */
1470 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1471 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1472 && DECL_INITIAL (olddecl) == 0)
1473 /* If -traditional, avoid error for redeclaring fcn
1474 after implicit decl. */
1476 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1477 && DECL_BUILT_IN (olddecl))
1479 /* A function declaration for a built-in function. */
1480 if (!TREE_PUBLIC (newdecl))
1482 /* If you declare a built-in function name as static, the
1483 built-in definition is overridden,
1484 but optionally warn this was a bad choice of name. */
1486 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1487 /* Discard the old built-in function. */
1490 else if (!types_match)
1492 /* Accept the return type of the new declaration if same modes. */
1493 tree oldreturntype = TREE_TYPE (oldtype);
1494 tree newreturntype = TREE_TYPE (newtype);
1496 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1498 /* Function types may be shared, so we can't just modify
1499 the return type of olddecl's function type. */
1501 = build_function_type (newreturntype,
1502 TYPE_ARG_TYPES (oldtype));
1503 trytype = build_type_attribute_variant (trytype,
1504 TYPE_ATTRIBUTES (oldtype));
1506 types_match = comptypes (newtype, trytype);
1510 /* Accept harmless mismatch in first argument type also.
1511 This is for the ffs and fprintf builtins. */
1512 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1513 && TYPE_ARG_TYPES (oldtype) != 0
1514 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1515 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1516 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1517 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1519 /* Function types may be shared, so we can't just modify
1520 the return type of olddecl's function type. */
1522 = build_function_type (TREE_TYPE (oldtype),
1523 tree_cons (NULL_TREE,
1524 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1525 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1526 trytype = build_type_attribute_variant (trytype,
1527 TYPE_ATTRIBUTES (oldtype));
1529 types_match = comptypes (newtype, trytype);
1533 if (! different_binding_level)
1534 TREE_TYPE (olddecl) = oldtype;
1538 /* If types don't match for a built-in, throw away the built-in. */
1539 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1543 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1544 && DECL_SOURCE_LINE (olddecl) == 0)
1546 /* A function declaration for a predeclared function
1547 that isn't actually built in. */
1548 if (!TREE_PUBLIC (newdecl))
1550 /* If you declare it as static, the
1551 default definition is overridden. */
1554 else if (!types_match)
1556 /* If the types don't match, preserve volatility indication.
1557 Later on, we will discard everything else about the
1558 default declaration. */
1559 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1562 /* Permit char *foo () to match void *foo (...) if not pedantic,
1563 if one of them came from a system header file. */
1564 else if (!types_match
1565 && TREE_CODE (olddecl) == FUNCTION_DECL
1566 && TREE_CODE (newdecl) == FUNCTION_DECL
1567 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1568 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1569 && (DECL_IN_SYSTEM_HEADER (olddecl)
1570 || DECL_IN_SYSTEM_HEADER (newdecl))
1571 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1572 && TYPE_ARG_TYPES (oldtype) == 0
1573 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1574 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1576 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1577 && TYPE_ARG_TYPES (newtype) == 0
1578 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1579 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1582 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1583 /* Make sure we keep void * as ret type, not char *. */
1584 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1585 TREE_TYPE (newdecl) = newtype = oldtype;
1587 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1588 we will come back here again. */
1589 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1591 else if (!types_match
1592 /* Permit char *foo (int, ...); followed by char *foo ();
1594 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1596 /* Return types must still match. */
1597 && comptypes (TREE_TYPE (oldtype),
1598 TREE_TYPE (newtype))
1599 && TYPE_ARG_TYPES (newtype) == 0))
1601 error_with_decl (newdecl, "conflicting types for `%s'");
1602 /* Check for function type mismatch
1603 involving an empty arglist vs a nonempty one. */
1604 if (TREE_CODE (olddecl) == FUNCTION_DECL
1605 && comptypes (TREE_TYPE (oldtype),
1606 TREE_TYPE (newtype))
1607 && ((TYPE_ARG_TYPES (oldtype) == 0
1608 && DECL_INITIAL (olddecl) == 0)
1610 (TYPE_ARG_TYPES (newtype) == 0
1611 && DECL_INITIAL (newdecl) == 0)))
1613 /* Classify the problem further. */
1614 tree t = TYPE_ARG_TYPES (oldtype);
1616 t = TYPE_ARG_TYPES (newtype);
1617 for (; t; t = TREE_CHAIN (t))
1619 tree type = TREE_VALUE (t);
1621 if (TREE_CHAIN (t) == 0
1622 && TYPE_MAIN_VARIANT (type) != void_type_node)
1624 error ("a parameter list with an ellipsis can't match an empty parameter name list declaration");
1628 if (simple_type_promotes_to (type) != NULL_TREE)
1630 error ("an argument type that has a default promotion can't match an empty parameter name list declaration");
1635 error_with_decl (olddecl, "previous declaration of `%s'");
1639 errmsg = redeclaration_error_message (newdecl, olddecl);
1645 error_with_decl (newdecl, "redefinition of `%s'");
1648 error_with_decl (newdecl, "redeclaration of `%s'");
1651 error_with_decl (newdecl, "conflicting declarations of `%s'");
1657 error_with_decl (olddecl,
1658 ((DECL_INITIAL (olddecl)
1659 && current_binding_level == global_binding_level)
1660 ? "`%s' previously defined here"
1661 : "`%s' previously declared here"));
1663 else if (TREE_CODE (newdecl) == TYPE_DECL
1664 && (DECL_IN_SYSTEM_HEADER (olddecl)
1665 || DECL_IN_SYSTEM_HEADER (newdecl)))
1667 warning_with_decl (newdecl, "redefinition of `%s'");
1670 ((DECL_INITIAL (olddecl)
1671 && current_binding_level == global_binding_level)
1672 ? "`%s' previously defined here"
1673 : "`%s' previously declared here"));
1675 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1676 && DECL_INITIAL (olddecl) != 0
1677 && TYPE_ARG_TYPES (oldtype) == 0
1678 && TYPE_ARG_TYPES (newtype) != 0
1679 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1683 /* Prototype decl follows defn w/o prototype. */
1685 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1686 type = TYPE_ARG_TYPES (newtype),
1689 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1691 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1692 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1694 warning_with_decl (newdecl, "prototype for `%s' follows");
1695 warning_with_decl (olddecl, "non-prototype definition here");
1698 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1699 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1701 error_with_decl (newdecl,
1702 "prototype for `%s' follows and number of arguments doesn't match");
1703 error_with_decl (olddecl, "non-prototype definition here");
1707 /* Type for passing arg must be consistent
1708 with that declared for the arg. */
1709 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1710 /* If -traditional, allow `unsigned int' instead of `int'
1711 in the prototype. */
1712 && (! (flag_traditional
1713 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1714 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1716 error_with_decl (newdecl,
1717 "prototype for `%s' follows and argument %d doesn't match",
1719 error_with_decl (olddecl, "non-prototype definition here");
1725 /* Warn about mismatches in various flags. */
1728 /* Warn if function is now inline
1729 but was previously declared not inline and has been called. */
1730 if (TREE_CODE (olddecl) == FUNCTION_DECL
1731 && ! DECL_DECLARED_INLINE_P (olddecl)
1732 && DECL_DECLARED_INLINE_P (newdecl)
1733 && TREE_USED (olddecl))
1734 warning_with_decl (newdecl,
1735 "`%s' declared inline after being called");
1736 if (TREE_CODE (olddecl) == FUNCTION_DECL
1737 && ! DECL_DECLARED_INLINE_P (olddecl)
1738 && DECL_DECLARED_INLINE_P (newdecl)
1739 && DECL_INITIAL (olddecl) != 0)
1740 warning_with_decl (newdecl,
1741 "`%s' declared inline after its definition");
1743 /* If pedantic, warn when static declaration follows a non-static
1744 declaration. Otherwise, do so only for functions. */
1745 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1746 && TREE_PUBLIC (olddecl)
1747 && !TREE_PUBLIC (newdecl))
1748 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1750 /* If warn_traditional, warn when a non-static function
1751 declaration follows a static one. */
1752 if (warn_traditional && !in_system_header
1753 && TREE_CODE (olddecl) == FUNCTION_DECL
1754 && !TREE_PUBLIC (olddecl)
1755 && TREE_PUBLIC (newdecl))
1756 warning_with_decl (newdecl, "non-static declaration for `%s' follows static");
1758 /* Warn when const declaration follows a non-const
1759 declaration, but not for functions. */
1760 if (TREE_CODE (olddecl) != FUNCTION_DECL
1761 && !TREE_READONLY (olddecl)
1762 && TREE_READONLY (newdecl))
1763 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1764 /* These bits are logically part of the type, for variables.
1765 But not for functions
1766 (where qualifiers are not valid ANSI anyway). */
1767 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1768 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1769 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1770 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1774 /* Optionally warn about more than one declaration for the same name. */
1775 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1776 /* Don't warn about a function declaration
1777 followed by a definition. */
1778 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1779 && DECL_INITIAL (olddecl) == 0)
1780 /* Don't warn about extern decl followed by (tentative) definition. */
1781 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1783 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1784 warning_with_decl (olddecl, "previous declaration of `%s'");
1787 /* Copy all the DECL_... slots specified in the new decl
1788 except for any that we copy here from the old type.
1790 Past this point, we don't change OLDTYPE and NEWTYPE
1791 even if we change the types of NEWDECL and OLDDECL. */
1795 /* When copying info to olddecl, we store into write_olddecl
1796 instead. This allows us to avoid modifying olddecl when
1797 different_binding_level is true. */
1798 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1800 /* Merge the data types specified in the two decls. */
1801 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1803 if (different_binding_level)
1805 if (TYPE_ARG_TYPES (oldtype) != 0
1806 && TYPE_ARG_TYPES (newtype) == 0)
1807 TREE_TYPE (newdecl) = common_type (newtype, oldtype);
1810 = build_type_attribute_variant
1812 merge_attributes (TYPE_ATTRIBUTES (newtype),
1813 TYPE_ATTRIBUTES (oldtype)));
1817 = TREE_TYPE (olddecl)
1818 = common_type (newtype, oldtype);
1821 /* Lay the type out, unless already done. */
1822 if (oldtype != TREE_TYPE (newdecl))
1824 if (TREE_TYPE (newdecl) != error_mark_node)
1825 layout_type (TREE_TYPE (newdecl));
1826 if (TREE_CODE (newdecl) != FUNCTION_DECL
1827 && TREE_CODE (newdecl) != TYPE_DECL
1828 && TREE_CODE (newdecl) != CONST_DECL)
1829 layout_decl (newdecl, 0);
1833 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1834 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1835 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1836 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1837 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1838 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1840 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1841 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1845 /* Keep the old rtl since we can safely use it. */
1846 COPY_DECL_RTL (olddecl, newdecl);
1848 /* Merge the type qualifiers. */
1849 if (TREE_CODE (olddecl) == FUNCTION_DECL
1850 && DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1851 && ! TREE_THIS_VOLATILE (newdecl))
1852 TREE_THIS_VOLATILE (write_olddecl) = 0;
1854 if (TREE_READONLY (newdecl))
1855 TREE_READONLY (write_olddecl) = 1;
1857 if (TREE_THIS_VOLATILE (newdecl))
1859 TREE_THIS_VOLATILE (write_olddecl) = 1;
1860 if (TREE_CODE (newdecl) == VAR_DECL
1861 /* If an automatic variable is re-declared in the same
1862 function scope, but the old declaration was not
1863 volatile, make_var_volatile() would crash because the
1864 variable would have been assigned to a pseudo, not a
1865 MEM. Since this duplicate declaration is invalid
1866 anyway, we just skip the call. */
1868 make_var_volatile (newdecl);
1871 /* Keep source location of definition rather than declaration. */
1872 /* When called with different_binding_level set, keep the old
1873 information so that meaningful diagnostics can be given. */
1874 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1875 && ! different_binding_level)
1877 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1878 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1881 /* Merge the unused-warning information. */
1882 if (DECL_IN_SYSTEM_HEADER (olddecl))
1883 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1884 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1885 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1887 /* Merge the initialization information. */
1888 /* When called with different_binding_level set, don't copy over
1889 DECL_INITIAL, so that we don't accidentally change function
1890 declarations into function definitions. */
1891 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1892 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1894 /* Merge the section attribute.
1895 We want to issue an error if the sections conflict but that must be
1896 done later in decl_attributes since we are called before attributes
1898 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1899 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1901 /* Copy the assembler name.
1902 Currently, it can only be defined in the prototype. */
1903 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1905 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1907 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1908 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1910 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1911 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1912 DECL_NO_CHECK_MEMORY_USAGE (newdecl)
1913 |= DECL_NO_CHECK_MEMORY_USAGE (olddecl);
1914 DECL_NO_LIMIT_STACK (newdecl)
1915 |= DECL_NO_LIMIT_STACK (olddecl);
1918 /* If cannot merge, then use the new type and qualifiers,
1919 and don't preserve the old rtl. */
1920 else if (! different_binding_level)
1922 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1923 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1924 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1925 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1928 /* Merge the storage class information. */
1929 DECL_WEAK (newdecl) |= DECL_WEAK (olddecl);
1930 /* For functions, static overrides non-static. */
1931 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1933 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1934 /* This is since we don't automatically
1935 copy the attributes of NEWDECL into OLDDECL. */
1936 /* No need to worry about different_binding_level here because
1937 then TREE_PUBLIC (newdecl) was true. */
1938 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1939 /* If this clears `static', clear it in the identifier too. */
1940 if (! TREE_PUBLIC (olddecl))
1941 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1943 if (DECL_EXTERNAL (newdecl))
1945 if (! different_binding_level)
1947 /* Don't mess with these flags on local externs; they remain
1948 external even if there's a declaration at file scope which
1950 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1951 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1953 /* An extern decl does not override previous storage class. */
1954 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1955 if (! DECL_EXTERNAL (newdecl))
1956 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1960 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1961 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1964 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1966 /* If we're redefining a function previously defined as extern
1967 inline, make sure we emit debug info for the inline before we
1968 throw it away, in case it was inlined into a function that hasn't
1969 been written out yet. */
1970 if (new_is_definition && DECL_INITIAL (olddecl) && TREE_USED (olddecl))
1972 (*debug_hooks->outlining_inline_function) (olddecl);
1974 /* The new defn must not be inline. */
1975 DECL_INLINE (newdecl) = 0;
1976 DECL_UNINLINABLE (newdecl) = 1;
1980 /* If either decl says `inline', this fn is inline,
1981 unless its definition was passed already. */
1982 if (DECL_DECLARED_INLINE_P (newdecl)
1983 && DECL_DECLARED_INLINE_P (olddecl) == 0)
1984 DECL_DECLARED_INLINE_P (olddecl) = 1;
1986 DECL_DECLARED_INLINE_P (newdecl) = DECL_DECLARED_INLINE_P (olddecl);
1988 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1989 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1992 if (DECL_BUILT_IN (olddecl))
1994 /* Get rid of any built-in function if new arg types don't match it
1995 or if we have a function definition. */
1996 if (! types_match || new_is_definition)
1998 if (! different_binding_level)
2000 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
2001 DECL_BUILT_IN_CLASS (olddecl) = NOT_BUILT_IN;
2006 /* If redeclaring a builtin function, and not a definition,
2007 it stays built in. */
2008 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2009 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2012 /* Also preserve various other info from the definition. */
2013 else if (! new_is_definition)
2014 DECL_NUM_STMTS (newdecl) = DECL_NUM_STMTS (olddecl);
2015 if (! new_is_definition)
2017 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2018 /* When called with different_binding_level set, don't copy over
2019 DECL_INITIAL, so that we don't accidentally change function
2020 declarations into function definitions. */
2021 if (! different_binding_level)
2022 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2023 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
2024 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
2025 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2026 if (DECL_INLINE (newdecl))
2027 DECL_ABSTRACT_ORIGIN (newdecl)
2028 = (different_binding_level
2029 ? DECL_ORIGIN (olddecl)
2030 : DECL_ABSTRACT_ORIGIN (olddecl));
2033 if (different_binding_level)
2036 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2037 But preserve OLDDECL's DECL_UID. */
2039 unsigned olddecl_uid = DECL_UID (olddecl);
2041 memcpy ((char *) olddecl + sizeof (struct tree_common),
2042 (char *) newdecl + sizeof (struct tree_common),
2043 sizeof (struct tree_decl) - sizeof (struct tree_common));
2044 DECL_UID (olddecl) = olddecl_uid;
2047 /* NEWDECL contains the merged attribute lists.
2048 Update OLDDECL to be the same. */
2049 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2054 /* Record a decl-node X as belonging to the current lexical scope.
2055 Check for errors (such as an incompatible declaration for the same
2056 name already seen in the same scope).
2058 Returns either X or an old decl for the same name.
2059 If an old decl is returned, it may have been smashed
2060 to agree with what X says. */
2067 tree name = DECL_NAME (x);
2068 struct binding_level *b = current_binding_level;
2070 /* Functions need the lang_decl data. */
2071 if (TREE_CODE (x) == FUNCTION_DECL && ! DECL_LANG_SPECIFIC (x))
2072 DECL_LANG_SPECIFIC (x) = (struct lang_decl *)
2073 ggc_alloc_cleared (sizeof (struct lang_decl));
2075 DECL_CONTEXT (x) = current_function_decl;
2076 /* A local extern declaration for a function doesn't constitute nesting.
2077 A local auto declaration does, since it's a forward decl
2078 for a nested function coming later. */
2079 if ((TREE_CODE (x) == FUNCTION_DECL || TREE_CODE (x) == VAR_DECL)
2080 && DECL_INITIAL (x) == 0 && DECL_EXTERNAL (x))
2081 DECL_CONTEXT (x) = 0;
2085 int different_binding_level = 0;
2087 if (warn_nested_externs
2088 && DECL_EXTERNAL (x)
2089 && b != global_binding_level
2090 && x != IDENTIFIER_IMPLICIT_DECL (name)
2091 /* No error messages for __FUNCTION__ and __PRETTY_FUNCTION__. */
2092 && !DECL_IN_SYSTEM_HEADER (x))
2093 warning ("nested extern declaration of `%s'",
2094 IDENTIFIER_POINTER (name));
2096 t = lookup_name_current_level (name);
2097 /* Don't type check externs here when -traditional. This is so that
2098 code with conflicting declarations inside blocks will get warnings
2099 not errors. X11 for instance depends on this. */
2100 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
2102 t = lookup_name (name);
2103 /* Type decls at global scope don't conflict with externs declared
2104 inside lexical blocks. */
2105 if (t && TREE_CODE (t) == TYPE_DECL)
2107 different_binding_level = 1;
2109 if (t != 0 && t == error_mark_node)
2110 /* error_mark_node is 0 for a while during initialization! */
2113 error_with_decl (x, "`%s' used prior to declaration");
2116 /* If this decl is `static' and an implicit decl was seen previously,
2117 warn. But don't complain if -traditional,
2118 since traditional compilers don't complain. */
2119 if (! flag_traditional && TREE_PUBLIC (name)
2120 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2121 sets this for all functions. */
2122 && ! TREE_PUBLIC (x)
2123 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2124 /* We used to warn also for explicit extern followed by static,
2125 but sometimes you need to do it that way. */
2126 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2128 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2129 IDENTIFIER_POINTER (name));
2130 pedwarn_with_file_and_line
2131 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2132 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2133 "previous declaration of `%s'",
2134 IDENTIFIER_POINTER (name));
2135 TREE_THIS_VOLATILE (name) = 1;
2138 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2140 if (TREE_CODE (t) == PARM_DECL)
2142 /* Don't allow more than one "real" duplicate
2143 of a forward parm decl. */
2144 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2150 /* If we are processing a typedef statement, generate a whole new
2151 ..._TYPE node (which will be just an variant of the existing
2152 ..._TYPE node with identical properties) and then install the
2153 TYPE_DECL node generated to represent the typedef name as the
2154 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2156 The whole point here is to end up with a situation where each
2157 and every ..._TYPE node the compiler creates will be uniquely
2158 associated with AT MOST one node representing a typedef name.
2159 This way, even though the compiler substitutes corresponding
2160 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2161 early on, later parts of the compiler can always do the reverse
2162 translation and get back the corresponding typedef name. For
2165 typedef struct S MY_TYPE;
2168 Later parts of the compiler might only know that `object' was of
2169 type `struct S' if it were not for code just below. With this
2170 code however, later parts of the compiler see something like:
2172 struct S' == struct S
2173 typedef struct S' MY_TYPE;
2176 And they can then deduce (from the node for type struct S') that
2177 the original object declaration was:
2181 Being able to do this is important for proper support of protoize,
2182 and also for generating precise symbolic debugging information
2183 which takes full account of the programmer's (typedef) vocabulary.
2185 Obviously, we don't want to generate a duplicate ..._TYPE node if
2186 the TYPE_DECL node that we are now processing really represents a
2187 standard built-in type.
2189 Since all standard types are effectively declared at line zero
2190 in the source file, we can easily check to see if we are working
2191 on a standard type by checking the current value of lineno. */
2193 if (TREE_CODE (x) == TYPE_DECL)
2195 if (DECL_SOURCE_LINE (x) == 0)
2197 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2198 TYPE_NAME (TREE_TYPE (x)) = x;
2200 else if (TREE_TYPE (x) != error_mark_node
2201 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2203 tree tt = TREE_TYPE (x);
2204 DECL_ORIGINAL_TYPE (x) = tt;
2205 tt = build_type_copy (tt);
2207 TREE_USED (tt) = TREE_USED (x);
2212 /* Multiple external decls of the same identifier ought to match.
2213 Check against both global declarations (when traditional) and out of
2214 scope (limbo) block level declarations.
2216 We get warnings about inline functions where they are defined.
2217 Avoid duplicate warnings where they are used. */
2219 && ! (TREE_CODE (x) == FUNCTION_DECL && DECL_INLINE (x)))
2223 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2224 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2225 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2226 decl = IDENTIFIER_GLOBAL_VALUE (name);
2227 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2228 /* Decls in limbo are always extern, so no need to check that. */
2229 decl = IDENTIFIER_LIMBO_VALUE (name);
2233 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2234 /* If old decl is built-in, we already warned if we should. */
2235 && !DECL_BUILT_IN (decl))
2237 pedwarn_with_decl (x,
2238 "type mismatch with previous external decl");
2239 pedwarn_with_decl (decl, "previous external decl of `%s'");
2243 /* If a function has had an implicit declaration, and then is defined,
2244 make sure they are compatible. */
2246 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2247 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2248 && TREE_CODE (x) == FUNCTION_DECL
2249 && ! comptypes (TREE_TYPE (x),
2250 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2252 warning_with_decl (x, "type mismatch with previous implicit declaration");
2253 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2254 "previous implicit declaration of `%s'");
2257 /* In PCC-compatibility mode, extern decls of vars with no current decl
2258 take effect at top level no matter where they are. */
2259 if (flag_traditional && DECL_EXTERNAL (x)
2260 && lookup_name (name) == 0)
2262 tree type = TREE_TYPE (x);
2264 /* But don't do this if the type contains temporary nodes. */
2267 if (type == error_mark_node)
2269 if (TYPE_CONTEXT (type))
2271 warning_with_decl (x, "type of external `%s' is not global");
2272 /* By exiting the loop early, we leave TYPE nonzero,
2273 and thus prevent globalization of the decl. */
2276 else if (TREE_CODE (type) == FUNCTION_TYPE
2277 && TYPE_ARG_TYPES (type) != 0)
2278 /* The types might not be truly local,
2279 but the list of arg types certainly is temporary.
2280 Since prototypes are nontraditional,
2281 ok not to do the traditional thing. */
2283 type = TREE_TYPE (type);
2287 b = global_binding_level;
2290 /* This name is new in its binding level.
2291 Install the new declaration and return it. */
2292 if (b == global_binding_level)
2294 /* Install a global value. */
2296 /* If the first global decl has external linkage,
2297 warn if we later see static one. */
2298 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2299 TREE_PUBLIC (name) = 1;
2301 IDENTIFIER_GLOBAL_VALUE (name) = x;
2303 /* We no longer care about any previous block level declarations. */
2304 IDENTIFIER_LIMBO_VALUE (name) = 0;
2306 /* Don't forget if the function was used via an implicit decl. */
2307 if (IDENTIFIER_IMPLICIT_DECL (name)
2308 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2309 TREE_USED (x) = 1, TREE_USED (name) = 1;
2311 /* Don't forget if its address was taken in that way. */
2312 if (IDENTIFIER_IMPLICIT_DECL (name)
2313 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2314 TREE_ADDRESSABLE (x) = 1;
2316 /* Warn about mismatches against previous implicit decl. */
2317 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2318 /* If this real decl matches the implicit, don't complain. */
2319 && ! (TREE_CODE (x) == FUNCTION_DECL
2320 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2321 == integer_type_node)))
2322 pedwarn ("`%s' was previously implicitly declared to return `int'",
2323 IDENTIFIER_POINTER (name));
2325 /* If this decl is `static' and an `extern' was seen previously,
2326 that is erroneous. */
2327 if (TREE_PUBLIC (name)
2328 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2330 /* Okay to redeclare an ANSI built-in as static. */
2331 if (t != 0 && DECL_BUILT_IN (t))
2333 /* Okay to declare a non-ANSI built-in as anything. */
2334 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2336 /* Okay to have global type decl after an earlier extern
2337 declaration inside a lexical block. */
2338 else if (TREE_CODE (x) == TYPE_DECL)
2340 else if (IDENTIFIER_IMPLICIT_DECL (name))
2342 if (! TREE_THIS_VOLATILE (name))
2343 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2344 IDENTIFIER_POINTER (name));
2347 pedwarn ("`%s' was declared `extern' and later `static'",
2348 IDENTIFIER_POINTER (name));
2353 /* Here to install a non-global value. */
2354 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2355 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2357 IDENTIFIER_LOCAL_VALUE (name) = x;
2359 /* If this is an extern function declaration, see if we
2360 have a global definition or declaration for the function. */
2363 && TREE_CODE (x) == FUNCTION_DECL
2364 && TREE_CODE (oldglobal) == FUNCTION_DECL
2365 && DECL_EXTERNAL (x)
2366 && ! DECL_DECLARED_INLINE_P (x))
2368 /* We have one. Their types must agree. */
2369 if (! comptypes (TREE_TYPE (x),
2370 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2371 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2374 /* Inner extern decl is inline if global one is.
2375 Copy enough to really inline it. */
2376 if (DECL_DECLARED_INLINE_P (oldglobal))
2378 DECL_DECLARED_INLINE_P (x)
2379 = DECL_DECLARED_INLINE_P (oldglobal);
2380 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2381 DECL_INITIAL (x) = (current_function_decl == oldglobal
2382 ? 0 : DECL_INITIAL (oldglobal));
2383 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2384 DECL_NUM_STMTS (x) = DECL_NUM_STMTS (oldglobal);
2385 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2386 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2387 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2388 DECL_ABSTRACT_ORIGIN (x)
2389 = DECL_ABSTRACT_ORIGIN (oldglobal);
2391 /* Inner extern decl is built-in if global one is. */
2392 if (DECL_BUILT_IN (oldglobal))
2394 DECL_BUILT_IN_CLASS (x) = DECL_BUILT_IN_CLASS (oldglobal);
2395 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2397 /* Keep the arg types from a file-scope fcn defn. */
2398 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2399 && DECL_INITIAL (oldglobal)
2400 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2401 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2406 /* This case is probably sometimes the right thing to do. */
2407 /* If we have a local external declaration,
2408 then any file-scope declaration should not
2409 have been static. */
2410 if (oldlocal == 0 && oldglobal != 0
2411 && !TREE_PUBLIC (oldglobal)
2412 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2413 warning ("`%s' locally external but globally static",
2414 IDENTIFIER_POINTER (name));
2417 /* If we have a local external declaration,
2418 and no file-scope declaration has yet been seen,
2419 then if we later have a file-scope decl it must not be static. */
2421 && DECL_EXTERNAL (x)
2425 TREE_PUBLIC (name) = 1;
2427 /* Save this decl, so that we can do type checking against
2428 other decls after it falls out of scope.
2430 Only save it once. This prevents temporary decls created in
2431 expand_inline_function from being used here, since this
2432 will have been set when the inline function was parsed.
2433 It also helps give slightly better warnings. */
2434 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2435 IDENTIFIER_LIMBO_VALUE (name) = x;
2438 /* Warn if shadowing an argument at the top level of the body. */
2439 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2440 /* This warning doesn't apply to the parms of a nested fcn. */
2441 && ! current_binding_level->parm_flag
2442 /* Check that this is one level down from the parms. */
2443 && current_binding_level->level_chain->parm_flag
2444 /* Check that the decl being shadowed
2445 comes from the parm level, one level up. */
2446 && chain_member (oldlocal, current_binding_level->level_chain->names))
2448 if (TREE_CODE (oldlocal) == PARM_DECL)
2449 pedwarn ("declaration of `%s' shadows a parameter",
2450 IDENTIFIER_POINTER (name));
2452 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2453 IDENTIFIER_POINTER (name));
2456 /* Maybe warn if shadowing something else. */
2457 else if (warn_shadow && !DECL_EXTERNAL (x)
2458 /* No shadow warnings for internally generated vars. */
2459 && DECL_SOURCE_LINE (x) != 0
2460 /* No shadow warnings for vars made for inlining. */
2461 && ! DECL_FROM_INLINE (x))
2463 const char *id = IDENTIFIER_POINTER (name);
2465 if (TREE_CODE (x) == PARM_DECL
2466 && current_binding_level->level_chain->parm_flag)
2467 /* Don't warn about the parm names in function declarator
2468 within a function declarator.
2469 It would be nice to avoid warning in any function
2470 declarator in a declaration, as opposed to a definition,
2471 but there is no way to tell it's not a definition. */
2473 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2474 warning ("declaration of `%s' shadows a parameter", id);
2475 else if (oldlocal != 0)
2476 warning ("declaration of `%s' shadows previous local", id);
2477 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2478 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2479 warning ("declaration of `%s' shadows global declaration", id);
2482 /* If storing a local value, there may already be one (inherited).
2483 If so, record it for restoration when this binding level ends. */
2485 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2488 /* Keep count of variables in this level with incomplete type.
2489 If the input is erroneous, we can have error_mark in the type
2490 slot (e.g. "f(void a, ...)") - that doesn't count as an
2492 if (TREE_TYPE (x) != error_mark_node
2493 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2497 /* Put decls on list in reverse order.
2498 We will reverse them later if necessary. */
2499 TREE_CHAIN (x) = b->names;
2505 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2508 pushdecl_top_level (x)
2512 struct binding_level *b = current_binding_level;
2514 current_binding_level = global_binding_level;
2516 current_binding_level = b;
2520 /* Generate an implicit declaration for identifier FUNCTIONID
2521 as a function of type int (). Print a warning if appropriate. */
2524 implicitly_declare (functionid)
2528 int traditional_warning = 0;
2529 /* Only one "implicit declaration" warning per identifier. */
2530 int implicit_warning;
2532 /* We used to reuse an old implicit decl here,
2533 but this loses with inline functions because it can clobber
2534 the saved decl chains. */
2536 if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2537 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2540 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2542 /* Warn of implicit decl following explicit local extern decl.
2543 This is probably a program designed for traditional C. */
2544 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2545 traditional_warning = 1;
2547 /* Warn once of an implicit declaration. */
2548 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2550 DECL_EXTERNAL (decl) = 1;
2551 TREE_PUBLIC (decl) = 1;
2553 /* Record that we have an implicit decl and this is it. */
2554 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2556 /* ANSI standard says implicit declarations are in the innermost block.
2557 So we record the decl in the standard fashion.
2558 If flag_traditional is set, pushdecl does it top-level. */
2561 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2562 maybe_objc_check_decl (decl);
2564 rest_of_decl_compilation (decl, NULL, 0, 0);
2566 if (implicit_warning)
2567 implicit_decl_warning (functionid);
2568 else if (warn_traditional && traditional_warning)
2569 warning ("function `%s' was previously declared within a block",
2570 IDENTIFIER_POINTER (functionid));
2572 /* Write a record describing this implicit function declaration to the
2573 prototypes file (if requested). */
2575 gen_aux_info_record (decl, 0, 1, 0);
2577 /* Possibly apply some default attributes to this implicit declaration. */
2578 decl_attributes (&decl, NULL_TREE, 0);
2584 implicit_decl_warning (id)
2587 const char *name = IDENTIFIER_POINTER (id);
2588 if (mesg_implicit_function_declaration == 2)
2589 error ("implicit declaration of function `%s'", name);
2590 else if (mesg_implicit_function_declaration == 1)
2591 warning ("implicit declaration of function `%s'", name);
2594 /* Return zero if the declaration NEWDECL is valid
2595 when the declaration OLDDECL (assumed to be for the same name)
2596 has already been seen.
2597 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
2598 and 3 if it is a conflicting declaration. */
2601 redeclaration_error_message (newdecl, olddecl)
2602 tree newdecl, olddecl;
2604 if (TREE_CODE (newdecl) == TYPE_DECL)
2606 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2608 /* pushdecl creates distinct types for TYPE_DECLs by calling
2609 build_type_copy, so the above comparison generally fails. We do
2610 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2611 is equivalent to what this code used to do before the build_type_copy
2612 call. The variant type distinction should not matter for traditional
2613 code, because it doesn't have type qualifiers. */
2614 if (flag_traditional
2615 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
2617 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2621 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2623 /* Declarations of functions can insist on internal linkage
2624 but they can't be inconsistent with internal linkage,
2625 so there can be no error on that account.
2626 However defining the same name twice is no good. */
2627 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2628 /* However, defining once as extern inline and a second
2629 time in another way is ok. */
2630 && ! (DECL_DECLARED_INLINE_P (olddecl) && DECL_EXTERNAL (olddecl)
2631 && ! (DECL_DECLARED_INLINE_P (newdecl)
2632 && 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 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 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 struct binding_level *level;
2852 for (level = binding_level; level; level = level->level_chain)
2855 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2857 if (TREE_PURPOSE (tail) == name)
2859 if (TREE_CODE (TREE_VALUE (tail)) != code)
2861 /* Definition isn't the kind we were looking for. */
2862 pending_invalid_xref = name;
2863 pending_invalid_xref_file = input_filename;
2864 pending_invalid_xref_line = lineno;
2865 /* If in the same binding level as a declaration as a tag
2866 of a different type, this must not be allowed to
2867 shadow that tag, so give the error immediately.
2868 (For example, "struct foo; union foo;" is invalid.) */
2870 pending_xref_error ();
2872 return TREE_VALUE (tail);
2875 if (! level->tag_transparent)
2885 /* Print an error message now
2886 for a recent invalid struct, union or enum cross reference.
2887 We don't print them immediately because they are not invalid
2888 when used in the `struct foo;' construct for shadowing. */
2891 pending_xref_error ()
2893 if (pending_invalid_xref != 0)
2894 error_with_file_and_line (pending_invalid_xref_file,
2895 pending_invalid_xref_line,
2896 "`%s' defined as wrong kind of tag",
2897 IDENTIFIER_POINTER (pending_invalid_xref));
2898 pending_invalid_xref = 0;
2901 /* Given a type, find the tag that was defined for it and return the tag name.
2902 Otherwise return 0. */
2905 lookup_tag_reverse (type)
2908 struct binding_level *level;
2910 for (level = current_binding_level; level; level = level->level_chain)
2913 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2915 if (TREE_VALUE (tail) == type)
2916 return TREE_PURPOSE (tail);
2922 /* Look up NAME in the current binding level and its superiors
2923 in the namespace of variables, functions and typedefs.
2924 Return a ..._DECL node of some kind representing its definition,
2925 or return 0 if it is undefined. */
2933 if (current_binding_level != global_binding_level
2934 && IDENTIFIER_LOCAL_VALUE (name))
2935 val = IDENTIFIER_LOCAL_VALUE (name);
2937 val = IDENTIFIER_GLOBAL_VALUE (name);
2941 /* Similar to `lookup_name' but look only at current binding level. */
2944 lookup_name_current_level (name)
2949 if (current_binding_level == global_binding_level)
2950 return IDENTIFIER_GLOBAL_VALUE (name);
2952 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2955 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2956 if (DECL_NAME (t) == name)
2962 /* Mark ARG for GC. */
2965 mark_binding_level (arg)
2968 struct binding_level *level = *(struct binding_level **) arg;
2970 for (; level != 0; level = level->level_chain)
2972 ggc_mark_tree (level->names);
2973 ggc_mark_tree (level->tags);
2974 ggc_mark_tree (level->shadowed);
2975 ggc_mark_tree (level->blocks);
2976 ggc_mark_tree (level->this_block);
2977 ggc_mark_tree (level->parm_order);
2981 /* Create the predefined scalar types of C,
2982 and some nodes representing standard constants (0, 1, (void *) 0).
2983 Initialize the global binding level.
2984 Make definitions for built-in primitive functions. */
2987 c_init_decl_processing ()
2990 tree ptr_ftype_void, ptr_ftype_ptr;
2992 /* Adds some ggc roots, and reserved words for c-parse.in. */
2995 current_function_decl = NULL;
2996 named_labels = NULL;
2997 current_binding_level = NULL_BINDING_LEVEL;
2998 free_binding_level = NULL_BINDING_LEVEL;
3000 /* Make the binding_level structure for global names. */
3002 global_binding_level = current_binding_level;
3004 build_common_tree_nodes (flag_signed_char);
3006 c_common_nodes_and_builtins ();
3008 boolean_type_node = integer_type_node;
3009 boolean_true_node = integer_one_node;
3010 boolean_false_node = integer_zero_node;
3012 /* With GCC, C99's _Bool is always of size 1. */
3013 c_bool_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
3014 TREE_SET_CODE (c_bool_type_node, BOOLEAN_TYPE);
3015 TYPE_MAX_VALUE (c_bool_type_node) = build_int_2 (1, 0);
3016 TREE_TYPE (TYPE_MAX_VALUE (c_bool_type_node)) = c_bool_type_node;
3017 TYPE_PRECISION (c_bool_type_node) = 1;
3018 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
3020 c_bool_false_node = build_int_2 (0, 0);
3021 TREE_TYPE (c_bool_false_node) = c_bool_type_node;
3022 c_bool_true_node = build_int_2 (1, 0);
3023 TREE_TYPE (c_bool_true_node) = c_bool_type_node;
3025 endlink = void_list_node;
3026 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
3028 = build_function_type (ptr_type_node,
3029 tree_cons (NULL_TREE, ptr_type_node, endlink));
3031 /* Types which are common to the fortran compiler and libf2c. When
3032 changing these, you also need to be concerned with f/com.h. */
3034 if (TYPE_PRECISION (float_type_node)
3035 == TYPE_PRECISION (long_integer_type_node))
3037 g77_integer_type_node = long_integer_type_node;
3038 g77_uinteger_type_node = long_unsigned_type_node;
3040 else if (TYPE_PRECISION (float_type_node)
3041 == TYPE_PRECISION (integer_type_node))
3043 g77_integer_type_node = integer_type_node;
3044 g77_uinteger_type_node = unsigned_type_node;
3047 g77_integer_type_node = g77_uinteger_type_node = NULL_TREE;
3049 if (g77_integer_type_node != NULL_TREE)
3051 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_integer"),
3052 g77_integer_type_node));
3053 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_uinteger"),
3054 g77_uinteger_type_node));
3057 if (TYPE_PRECISION (float_type_node) * 2
3058 == TYPE_PRECISION (long_integer_type_node))
3060 g77_longint_type_node = long_integer_type_node;
3061 g77_ulongint_type_node = long_unsigned_type_node;
3063 else if (TYPE_PRECISION (float_type_node) * 2
3064 == TYPE_PRECISION (long_long_integer_type_node))
3066 g77_longint_type_node = long_long_integer_type_node;
3067 g77_ulongint_type_node = long_long_unsigned_type_node;
3070 g77_longint_type_node = g77_ulongint_type_node = NULL_TREE;
3072 if (g77_longint_type_node != NULL_TREE)
3074 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_longint"),
3075 g77_longint_type_node));
3076 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_ulongint"),
3077 g77_ulongint_type_node));
3080 pedantic_lvalues = pedantic;
3082 make_fname_decl = c_make_fname_decl;
3083 start_fname_decls ();
3085 incomplete_decl_finalize_hook = finish_incomplete_decl;
3087 /* Record our roots. */
3089 ggc_add_tree_root (c_global_trees, CTI_MAX);
3090 ggc_add_root (&c_stmt_tree, 1, sizeof c_stmt_tree, mark_stmt_tree);
3091 ggc_add_tree_root (&c_scope_stmt_stack, 1);
3092 ggc_add_tree_root (&named_labels, 1);
3093 ggc_add_tree_root (&shadowed_labels, 1);
3094 ggc_add_root (¤t_binding_level, 1, sizeof current_binding_level,
3095 mark_binding_level);
3096 ggc_add_root (&label_level_chain, 1, sizeof label_level_chain,
3097 mark_binding_level);
3098 ggc_add_tree_root (&static_ctors, 1);
3099 ggc_add_tree_root (&static_dtors, 1);
3102 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3103 decl, NAME is the initialization string and TYPE_DEP indicates whether
3104 NAME depended on the type of the function. As we don't yet implement
3105 delayed emission of static data, we mark the decl as emitted
3106 so it is not placed in the output. Anything using it must therefore pull
3107 out the STRING_CST initializer directly. This does mean that these names
3108 are string merging candidates, which is wrong for C99's __func__. FIXME. */
3111 c_make_fname_decl (id, type_dep)
3115 const char *name = fname_as_string (type_dep);
3116 tree decl, type, init;
3117 size_t length = strlen (name);
3119 type = build_array_type
3120 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
3121 build_index_type (size_int (length)));
3123 decl = build_decl (VAR_DECL, id, type);
3124 /* We don't push the decl, so have to set its context here. */
3125 DECL_CONTEXT (decl) = current_function_decl;
3127 TREE_STATIC (decl) = 1;
3128 TREE_READONLY (decl) = 1;
3129 DECL_ARTIFICIAL (decl) = 1;
3131 init = build_string (length + 1, name);
3132 TREE_TYPE (init) = type;
3133 DECL_INITIAL (decl) = init;
3135 TREE_USED (decl) = 1;
3137 finish_decl (decl, init, NULL_TREE);
3142 /* Return a definition for a builtin function named NAME and whose data type
3143 is TYPE. TYPE should be a function type with argument types.
3144 FUNCTION_CODE tells later passes how to compile calls to this function.
3145 See tree.h for its possible values.
3147 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3148 the name to be called if we can't opencode the function. */
3151 builtin_function (name, type, function_code, class, library_name)
3155 enum built_in_class class;
3156 const char *library_name;
3158 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3159 DECL_EXTERNAL (decl) = 1;
3160 TREE_PUBLIC (decl) = 1;
3161 /* If -traditional, permit redefining a builtin function any way you like.
3162 (Though really, if the program redefines these functions,
3163 it probably won't work right unless compiled with -fno-builtin.) */
3164 if (flag_traditional && name[0] != '_')
3165 DECL_BUILT_IN_NONANSI (decl) = 1;
3167 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
3168 make_decl_rtl (decl, NULL);
3170 DECL_BUILT_IN_CLASS (decl) = class;
3171 DECL_FUNCTION_CODE (decl) = function_code;
3173 /* Warn if a function in the namespace for users
3174 is used without an occasion to consider it declared. */
3175 if (name[0] != '_' || name[1] != '_')
3176 C_DECL_ANTICIPATED (decl) = 1;
3178 /* Possibly apply some default attributes to this built-in function. */
3179 decl_attributes (&decl, NULL_TREE, 0);
3184 /* Apply default attributes to a function, if a system function with default
3188 insert_default_attributes (decl)
3191 if (!TREE_PUBLIC (decl))
3193 c_common_insert_default_attributes (decl);
3196 /* Called when a declaration is seen that contains no names to declare.
3197 If its type is a reference to a structure, union or enum inherited
3198 from a containing scope, shadow that tag name for the current scope
3199 with a forward reference.
3200 If its type defines a new named structure or union
3201 or defines an enum, it is valid but we need not do anything here.
3202 Otherwise, it is an error. */
3205 shadow_tag (declspecs)
3208 shadow_tag_warned (declspecs, 0);
3212 shadow_tag_warned (declspecs, warned)
3215 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3222 pending_invalid_xref = 0;
3224 /* Remove the attributes from declspecs, since they will confuse the
3226 split_specs_attrs (declspecs, &specs, &attrs);
3228 for (link = specs; link; link = TREE_CHAIN (link))
3230 tree value = TREE_VALUE (link);
3231 enum tree_code code = TREE_CODE (value);
3233 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3234 /* Used to test also that TYPE_SIZE (value) != 0.
3235 That caused warning for `struct foo;' at top level in the file. */
3237 tree name = lookup_tag_reverse (value);
3244 if (warned != 1 && code != ENUMERAL_TYPE)
3245 /* Empty unnamed enum OK */
3247 pedwarn ("unnamed struct/union that defines no instances");
3253 t = lookup_tag (code, name, current_binding_level, 1);
3257 t = make_node (code);
3264 if (!warned && ! in_system_header)
3266 warning ("useless keyword or type name in empty declaration");
3273 error ("two types specified in one empty declaration");
3278 pedwarn ("empty declaration");
3282 /* Construct an array declarator. EXPR is the expression inside [], or
3283 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
3284 to the pointer to which a parameter array is converted). STATIC_P is
3285 non-zero if "static" is inside the [], zero otherwise. VLA_UNSPEC_P
3286 is non-zero is the array is [*], a VLA of unspecified length which is
3287 nevertheless a complete type (not currently implemented by GCC),
3288 zero otherwise. The declarator is constructed as an ARRAY_REF
3289 (to be decoded by grokdeclarator), whose operand 0 is what's on the
3290 left of the [] (filled by in set_array_declarator_type) and operand 1
3291 is the expression inside; whose TREE_TYPE is the type qualifiers and
3292 which has TREE_STATIC set if "static" is used. */
3295 build_array_declarator (expr, quals, static_p, vla_unspec_p)
3302 decl = build_nt (ARRAY_REF, NULL_TREE, expr);
3303 TREE_TYPE (decl) = quals;
3304 TREE_STATIC (decl) = (static_p ? 1 : 0);
3305 if (pedantic && !flag_isoc99)
3307 if (static_p || quals != NULL_TREE)
3308 pedwarn ("ISO C89 does not support `static' or type qualifiers in parameter array declarators");
3310 pedwarn ("ISO C89 does not support `[*]' array declarators");
3313 warning ("GCC does not yet properly implement `[*]' array declarators");
3317 /* Set the type of an array declarator. DECL is the declarator, as
3318 constructed by build_array_declarator; TYPE is what appears on the left
3319 of the [] and goes in operand 0. ABSTRACT_P is non-zero if it is an
3320 abstract declarator, zero otherwise; this is used to reject static and
3321 type qualifiers in abstract declarators, where they are not in the
3325 set_array_declarator_type (decl, type, abstract_p)
3330 TREE_OPERAND (decl, 0) = type;
3331 if (abstract_p && (TREE_TYPE (decl) != NULL_TREE || TREE_STATIC (decl)))
3332 error ("static or type qualifiers in abstract declarator");
3336 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3339 groktypename (typename)
3342 if (TREE_CODE (typename) != TREE_LIST)
3344 return grokdeclarator (TREE_VALUE (typename),
3345 TREE_PURPOSE (typename),
3349 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3352 groktypename_in_parm_context (typename)
3355 if (TREE_CODE (typename) != TREE_LIST)
3357 return grokdeclarator (TREE_VALUE (typename),
3358 TREE_PURPOSE (typename),
3362 /* Decode a declarator in an ordinary declaration or data definition.
3363 This is called as soon as the type information and variable name
3364 have been parsed, before parsing the initializer if any.
3365 Here we create the ..._DECL node, fill in its type,
3366 and put it on the list of decls for the current context.
3367 The ..._DECL node is returned as the value.
3369 Exception: for arrays where the length is not specified,
3370 the type is left null, to be filled in by `finish_decl'.
3372 Function definitions do not come here; they go to start_function
3373 instead. However, external and forward declarations of functions
3374 do go through here. Structure field declarations are done by
3375 grokfield and not through here. */
3378 start_decl (declarator, declspecs, initialized, attributes)
3379 tree declarator, declspecs;
3383 tree decl = grokdeclarator (declarator, declspecs,
3384 NORMAL, initialized);
3387 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3388 && MAIN_NAME_P (DECL_NAME (decl)))
3389 warning_with_decl (decl, "`%s' is usually a function");
3392 /* Is it valid for this decl to have an initializer at all?
3393 If not, set INITIALIZED to zero, which will indirectly
3394 tell `finish_decl' to ignore the initializer once it is parsed. */
3395 switch (TREE_CODE (decl))
3398 /* typedef foo = bar means give foo the same type as bar.
3399 We haven't parsed bar yet, so `finish_decl' will fix that up.
3400 Any other case of an initialization in a TYPE_DECL is an error. */
3401 if (pedantic || list_length (declspecs) > 1)
3403 error ("typedef `%s' is initialized",
3404 IDENTIFIER_POINTER (DECL_NAME (decl)));
3410 error ("function `%s' is initialized like a variable",
3411 IDENTIFIER_POINTER (DECL_NAME (decl)));
3416 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3417 error ("parameter `%s' is initialized",
3418 IDENTIFIER_POINTER (DECL_NAME (decl)));
3423 /* Don't allow initializations for incomplete types
3424 except for arrays which might be completed by the initialization. */
3426 /* This can happen if the array size is an undefined macro. We already
3427 gave a warning, so we don't need another one. */
3428 if (TREE_TYPE (decl) == error_mark_node)
3430 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3432 /* A complete type is ok if size is fixed. */
3434 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3435 || C_DECL_VARIABLE_SIZE (decl))
3437 error ("variable-sized object may not be initialized");
3441 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3443 error ("variable `%s' has initializer but incomplete type",
3444 IDENTIFIER_POINTER (DECL_NAME (decl)));
3447 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
3449 error ("elements of array `%s' have incomplete type",
3450 IDENTIFIER_POINTER (DECL_NAME (decl)));
3458 /* Seems redundant with grokdeclarator. */
3459 if (current_binding_level != global_binding_level
3460 && DECL_EXTERNAL (decl)
3461 && TREE_CODE (decl) != FUNCTION_DECL)
3462 warning ("declaration of `%s' has `extern' and is initialized",
3463 IDENTIFIER_POINTER (DECL_NAME (decl)));
3465 DECL_EXTERNAL (decl) = 0;
3466 if (current_binding_level == global_binding_level)
3467 TREE_STATIC (decl) = 1;
3469 /* Tell `pushdecl' this is an initialized decl
3470 even though we don't yet have the initializer expression.
3471 Also tell `finish_decl' it may store the real initializer. */
3472 DECL_INITIAL (decl) = error_mark_node;
3475 /* If this is a function declaration, write a record describing it to the
3476 prototypes file (if requested). */
3478 if (TREE_CODE (decl) == FUNCTION_DECL)
3479 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3481 /* ANSI specifies that a tentative definition which is not merged with
3482 a non-tentative definition behaves exactly like a definition with an
3483 initializer equal to zero. (Section 3.7.2)
3484 -fno-common gives strict ANSI behavior. Usually you don't want it.
3485 This matters only for variables with external linkage. */
3486 if (! flag_no_common || ! TREE_PUBLIC (decl))
3487 DECL_COMMON (decl) = 1;
3489 /* Set attributes here so if duplicate decl, will have proper attributes. */
3490 decl_attributes (&decl, attributes, 0);
3492 if (TREE_CODE (decl) == FUNCTION_DECL
3493 && DECL_DECLARED_INLINE_P (decl)
3494 && DECL_UNINLINABLE (decl)
3495 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
3496 warning_with_decl (decl,
3497 "inline function `%s' given attribute noinline");
3499 /* Add this decl to the current binding level.
3500 TEM may equal DECL or it may be a previous decl of the same name. */
3501 tem = pushdecl (decl);
3503 /* For a local variable, define the RTL now. */
3504 if (current_binding_level != global_binding_level
3505 /* But not if this is a duplicate decl
3506 and we preserved the rtl from the previous one
3507 (which may or may not happen). */
3508 && !DECL_RTL_SET_P (tem)
3509 && !DECL_CONTEXT (tem))
3511 if (TREE_TYPE (tem) != error_mark_node
3512 && COMPLETE_TYPE_P (TREE_TYPE (tem)))
3514 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3515 && DECL_INITIAL (tem) != 0)
3522 /* Finish processing of a declaration;
3523 install its initial value.
3524 If the length of an array type is not known before,
3525 it must be determined now, from the initial value, or it is an error. */
3528 finish_decl (decl, init, asmspec_tree)
3532 tree type = TREE_TYPE (decl);
3533 int was_incomplete = (DECL_SIZE (decl) == 0);
3534 const char *asmspec = 0;
3536 /* If a name was specified, get the string. */
3538 asmspec = TREE_STRING_POINTER (asmspec_tree);
3540 /* If `start_decl' didn't like having an initialization, ignore it now. */
3541 if (init != 0 && DECL_INITIAL (decl) == 0)
3544 /* Don't crash if parm is initialized. */
3545 if (TREE_CODE (decl) == PARM_DECL)
3550 if (TREE_CODE (decl) != TYPE_DECL)
3551 store_init_value (decl, init);
3554 /* typedef foo = bar; store the type of bar as the type of foo. */
3555 TREE_TYPE (decl) = TREE_TYPE (init);
3556 DECL_INITIAL (decl) = init = 0;
3560 /* Deduce size of array from initialization, if not already known */
3561 if (TREE_CODE (type) == ARRAY_TYPE
3562 && TYPE_DOMAIN (type) == 0
3563 && TREE_CODE (decl) != TYPE_DECL)
3566 = (TREE_STATIC (decl)
3567 /* Even if pedantic, an external linkage array
3568 may have incomplete type at first. */
3569 ? pedantic && !TREE_PUBLIC (decl)
3570 : !DECL_EXTERNAL (decl));
3572 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3574 /* Get the completed type made by complete_array_type. */
3575 type = TREE_TYPE (decl);
3578 error_with_decl (decl, "initializer fails to determine size of `%s'");
3580 else if (failure == 2)
3583 error_with_decl (decl, "array size missing in `%s'");
3584 /* If a `static' var's size isn't known,
3585 make it extern as well as static, so it does not get
3587 If it is not `static', then do not mark extern;
3588 finish_incomplete_decl will give it a default size
3589 and it will get allocated. */
3590 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3591 DECL_EXTERNAL (decl) = 1;
3594 /* TYPE_MAX_VALUE is always one less than the number of elements
3595 in the array, because we start counting at zero. Therefore,
3596 warn only if the value is less than zero. */
3597 else if (pedantic && TYPE_DOMAIN (type) != 0
3598 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3599 error_with_decl (decl, "zero or negative size array `%s'");
3601 layout_decl (decl, 0);
3604 if (TREE_CODE (decl) == VAR_DECL)
3606 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
3607 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3608 layout_decl (decl, 0);
3610 if (DECL_SIZE (decl) == 0
3611 /* Don't give an error if we already gave one earlier. */
3612 && TREE_TYPE (decl) != error_mark_node
3613 && (TREE_STATIC (decl)
3615 /* A static variable with an incomplete type
3616 is an error if it is initialized.
3617 Also if it is not file scope.
3618 Otherwise, let it through, but if it is not `extern'
3619 then it may cause an error message later. */
3620 (DECL_INITIAL (decl) != 0
3621 || DECL_CONTEXT (decl) != 0)
3623 /* An automatic variable with an incomplete type
3625 !DECL_EXTERNAL (decl)))
3627 error_with_decl (decl, "storage size of `%s' isn't known");
3628 TREE_TYPE (decl) = error_mark_node;
3631 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3632 && DECL_SIZE (decl) != 0)
3634 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3635 constant_expression_warning (DECL_SIZE (decl));
3637 error_with_decl (decl, "storage size of `%s' isn't constant");
3640 if (TREE_USED (type))
3641 TREE_USED (decl) = 1;
3644 /* If this is a function and an assembler name is specified, it isn't
3645 builtin any more. Also reset DECL_RTL so we can give it its new
3647 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3649 DECL_BUILT_IN_CLASS (decl) = NOT_BUILT_IN;
3650 SET_DECL_RTL (decl, NULL_RTX);
3651 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
3654 /* Output the assembler code and/or RTL code for variables and functions,
3655 unless the type is an undefined structure or union.
3656 If not, it will get done when the type is completed. */
3658 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3660 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3661 maybe_objc_check_decl (decl);
3663 if (!DECL_CONTEXT (decl))
3665 if (DECL_INITIAL (decl) == NULL_TREE
3666 || DECL_INITIAL (decl) == error_mark_node)
3667 /* Don't output anything
3668 when a tentative file-scope definition is seen.
3669 But at end of compilation, do output code for them. */
3670 DECL_DEFER_OUTPUT (decl) = 1;
3671 rest_of_decl_compilation (decl, asmspec,
3672 (DECL_CONTEXT (decl) == 0
3673 || TREE_ASM_WRITTEN (decl)), 0);
3677 /* This is a local variable. If there is an ASMSPEC, the
3678 user has requested that we handle it specially. */
3681 /* In conjunction with an ASMSPEC, the `register'
3682 keyword indicates that we should place the variable
3683 in a particular register. */
3684 if (DECL_REGISTER (decl))
3685 DECL_C_HARD_REGISTER (decl) = 1;
3687 /* If this is not a static variable, issue a warning.
3688 It doesn't make any sense to give an ASMSPEC for an
3689 ordinary, non-register local variable. Historically,
3690 GCC has accepted -- but ignored -- the ASMSPEC in
3692 if (TREE_CODE (decl) == VAR_DECL
3693 && !DECL_REGISTER (decl)
3694 && !TREE_STATIC (decl))
3695 warning_with_decl (decl,
3696 "ignoring asm-specifier for non-static local variable `%s'");
3698 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
3701 if (TREE_CODE (decl) != FUNCTION_DECL)
3702 add_decl_stmt (decl);
3705 if (DECL_CONTEXT (decl) != 0)
3707 /* Recompute the RTL of a local array now
3708 if it used to be an incomplete type. */
3710 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3712 /* If we used it already as memory, it must stay in memory. */
3713 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3714 /* If it's still incomplete now, no init will save it. */
3715 if (DECL_SIZE (decl) == 0)
3716 DECL_INITIAL (decl) = 0;
3721 if (TREE_CODE (decl) == TYPE_DECL)
3723 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3724 maybe_objc_check_decl (decl);
3725 rest_of_decl_compilation (decl, NULL, DECL_CONTEXT (decl) == 0, 0);
3728 /* At the end of a declaration, throw away any variable type sizes
3729 of types defined inside that declaration. There is no use
3730 computing them in the following function definition. */
3731 if (current_binding_level == global_binding_level)
3732 get_pending_sizes ();
3735 /* If DECL has a cleanup, build and return that cleanup here.
3736 This is a callback called by expand_expr. */
3739 maybe_build_cleanup (decl)
3740 tree decl ATTRIBUTE_UNUSED;
3742 /* There are no cleanups in C. */
3746 /* Given a parsed parameter declaration,
3747 decode it into a PARM_DECL and push that on the current binding level.
3748 Also, for the sake of forward parm decls,
3749 record the given order of parms in `parm_order'. */
3752 push_parm_decl (parm)
3756 int old_immediate_size_expand = immediate_size_expand;
3757 /* Don't try computing parm sizes now -- wait till fn is called. */
3758 immediate_size_expand = 0;
3760 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3761 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3762 decl_attributes (&decl, TREE_VALUE (parm), 0);
3765 if (DECL_NAME (decl))
3768 olddecl = lookup_name (DECL_NAME (decl));
3769 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3770 pedwarn_with_decl (decl,
3771 "ISO C forbids parameter `%s' shadowing typedef");
3775 decl = pushdecl (decl);
3777 immediate_size_expand = old_immediate_size_expand;
3779 current_binding_level->parm_order
3780 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3782 /* Add this decl to the current binding level. */
3783 finish_decl (decl, NULL_TREE, NULL_TREE);
3786 /* Clear the given order of parms in `parm_order'.
3787 Used at start of parm list,
3788 and also at semicolon terminating forward decls. */
3793 current_binding_level->parm_order = NULL_TREE;
3796 /* Make TYPE a complete type based on INITIAL_VALUE.
3797 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3798 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3801 complete_array_type (type, initial_value, do_default)
3806 tree maxindex = NULL_TREE;
3811 /* Note MAXINDEX is really the maximum index,
3812 one less than the size. */
3813 if (TREE_CODE (initial_value) == STRING_CST)
3816 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3817 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3820 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3822 tree elts = CONSTRUCTOR_ELTS (initial_value);
3823 maxindex = build_int_2 (-1, -1);
3824 for (; elts; elts = TREE_CHAIN (elts))
3826 if (TREE_PURPOSE (elts))
3827 maxindex = TREE_PURPOSE (elts);
3829 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3830 maxindex, integer_one_node));
3832 maxindex = copy_node (maxindex);
3836 /* Make an error message unless that happened already. */
3837 if (initial_value != error_mark_node)
3840 /* Prevent further error messages. */
3841 maxindex = build_int_2 (0, 0);
3848 maxindex = build_int_2 (0, 0);
3854 TYPE_DOMAIN (type) = build_index_type (maxindex);
3855 if (!TREE_TYPE (maxindex))
3856 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3859 /* Lay out the type now that we can get the real answer. */
3866 /* Given declspecs and a declarator,
3867 determine the name and type of the object declared
3868 and construct a ..._DECL node for it.
3869 (In one case we can return a ..._TYPE node instead.
3870 For invalid input we sometimes return 0.)
3872 DECLSPECS is a chain of tree_list nodes whose value fields
3873 are the storage classes and type specifiers.
3875 DECL_CONTEXT says which syntactic context this declaration is in:
3876 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3877 FUNCDEF for a function definition. Like NORMAL but a few different
3878 error messages in each case. Return value may be zero meaning
3879 this definition is too screwy to try to parse.
3880 PARM for a parameter declaration (either within a function prototype
3881 or before a function body). Make a PARM_DECL, or return void_type_node.
3882 TYPENAME if for a typename (in a cast or sizeof).
3883 Don't make a DECL node; just return the ..._TYPE node.
3884 FIELD for a struct or union field; make a FIELD_DECL.
3885 BITFIELD for a field with specified width.
3886 INITIALIZED is 1 if the decl has an initializer.
3888 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3889 It may also be so in the PARM case, for a prototype where the
3890 argument type is specified but not the name.
3892 This function is where the complicated C meanings of `static'
3893 and `extern' are interpreted. */
3896 grokdeclarator (declarator, declspecs, decl_context, initialized)
3899 enum decl_context decl_context;
3904 tree type = NULL_TREE;
3909 int type_quals = TYPE_UNQUALIFIED;
3911 int explicit_int = 0;
3912 int explicit_char = 0;
3913 int defaulted_int = 0;
3914 tree typedef_decl = 0;
3916 tree typedef_type = 0;
3917 int funcdef_flag = 0;
3918 enum tree_code innermost_code = ERROR_MARK;
3920 int size_varies = 0;
3921 tree decl_attr = NULL_TREE;
3922 tree array_ptr_quals = NULL_TREE;
3923 int array_parm_static = 0;
3924 tree returned_attrs = NULL_TREE;
3926 if (decl_context == BITFIELD)
3927 bitfield = 1, decl_context = FIELD;
3929 if (decl_context == FUNCDEF)
3930 funcdef_flag = 1, decl_context = NORMAL;
3932 /* Look inside a declarator for the name being declared
3933 and get it as a string, for an error message. */
3935 tree decl = declarator;
3939 switch (TREE_CODE (decl))
3944 innermost_code = TREE_CODE (decl);
3945 decl = TREE_OPERAND (decl, 0);
3949 decl = TREE_VALUE (decl);
3952 case IDENTIFIER_NODE:
3953 name = IDENTIFIER_POINTER (decl);
3964 /* A function definition's declarator must have the form of
3965 a function declarator. */
3967 if (funcdef_flag && innermost_code != CALL_EXPR)
3970 /* Anything declared one level down from the top level
3971 must be one of the parameters of a function
3972 (because the body is at least two levels down). */
3974 /* If this looks like a function definition, make it one,
3975 even if it occurs where parms are expected.
3976 Then store_parm_decls will reject it and not use it as a parm. */
3977 if (decl_context == NORMAL && !funcdef_flag
3978 && current_binding_level->parm_flag)
3979 decl_context = PARM;
3981 /* Look through the decl specs and record which ones appear.
3982 Some typespecs are defined as built-in typenames.
3983 Others, the ones that are modifiers of other types,
3984 are represented by bits in SPECBITS: set the bits for
3985 the modifiers that appear. Storage class keywords are also in SPECBITS.
3987 If there is a typedef name or a type, store the type in TYPE.
3988 This includes builtin typedefs such as `int'.
3990 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3991 and did not come from a user typedef.
3993 Set LONGLONG if `long' is mentioned twice. */
3995 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3997 tree id = TREE_VALUE (spec);
3999 if (id == ridpointers[(int) RID_INT])
4001 if (id == ridpointers[(int) RID_CHAR])
4004 if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
4006 enum rid i = C_RID_CODE (id);
4007 if ((int) i <= (int) RID_LAST_MODIFIER)
4009 if (i == RID_LONG && (specbits & (1 << (int) i)))
4012 error ("`long long long' is too long for GCC");
4015 if (pedantic && !flag_isoc99 && ! in_system_header
4017 pedwarn ("ISO C89 does not support `long long'");
4021 else if (specbits & (1 << (int) i))
4022 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
4023 specbits |= 1 << (int) i;
4028 error ("two or more data types in declaration of `%s'", name);
4029 /* Actual typedefs come to us as TYPE_DECL nodes. */
4030 else if (TREE_CODE (id) == TYPE_DECL)
4032 type = TREE_TYPE (id);
4033 decl_attr = DECL_ATTRIBUTES (id);
4036 /* Built-in types come as identifiers. */
4037 else if (TREE_CODE (id) == IDENTIFIER_NODE)
4039 tree t = lookup_name (id);
4040 if (TREE_TYPE (t) == error_mark_node)
4042 else if (!t || TREE_CODE (t) != TYPE_DECL)
4043 error ("`%s' fails to be a typedef or built in type",
4044 IDENTIFIER_POINTER (id));
4047 type = TREE_TYPE (t);
4051 else if (TREE_CODE (id) != ERROR_MARK)
4058 typedef_type = type;
4060 size_varies = C_TYPE_VARIABLE_SIZE (type);
4062 /* No type at all: default to `int', and set DEFAULTED_INT
4063 because it was not a user-defined typedef. */
4067 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4068 | (1 << (int) RID_SIGNED)
4069 | (1 << (int) RID_UNSIGNED)
4070 | (1 << (int) RID_COMPLEX))))
4071 /* Don't warn about typedef foo = bar. */
4072 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
4073 && ! in_system_header)
4075 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
4076 and this is a function, or if -Wimplicit; prefer the former
4077 warning since it is more explicit. */
4078 if ((warn_implicit_int || warn_return_type || flag_isoc99)
4080 warn_about_return_type = 1;
4081 else if (warn_implicit_int || flag_isoc99)
4082 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
4087 type = integer_type_node;
4090 /* Now process the modifiers that were specified
4091 and check for invalid combinations. */
4093 /* Long double is a special combination. */
4095 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4096 && TYPE_MAIN_VARIANT (type) == double_type_node)
4098 specbits &= ~(1 << (int) RID_LONG);
4099 type = long_double_type_node;
4102 /* Check all other uses of type modifiers. */
4104 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4105 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4109 if ((specbits & 1 << (int) RID_LONG)
4110 && (specbits & 1 << (int) RID_SHORT))
4111 error ("both long and short specified for `%s'", name);
4112 else if (((specbits & 1 << (int) RID_LONG)
4113 || (specbits & 1 << (int) RID_SHORT))
4115 error ("long or short specified with char for `%s'", name);
4116 else if (((specbits & 1 << (int) RID_LONG)
4117 || (specbits & 1 << (int) RID_SHORT))
4118 && TREE_CODE (type) == REAL_TYPE)
4120 static int already = 0;
4122 error ("long or short specified with floating type for `%s'", name);
4123 if (! already && ! pedantic)
4125 error ("the only valid combination is `long double'");
4129 else if ((specbits & 1 << (int) RID_SIGNED)
4130 && (specbits & 1 << (int) RID_UNSIGNED))
4131 error ("both signed and unsigned specified for `%s'", name);
4132 else if (TREE_CODE (type) != INTEGER_TYPE)
4133 error ("long, short, signed or unsigned invalid for `%s'", name);
4137 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4139 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4141 if (flag_pedantic_errors)
4146 /* Discard the type modifiers if they are invalid. */
4149 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4150 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4155 if ((specbits & (1 << (int) RID_COMPLEX))
4156 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4158 error ("complex invalid for `%s'", name);
4159 specbits &= ~(1 << (int) RID_COMPLEX);
4162 /* Decide whether an integer type is signed or not.
4163 Optionally treat bitfields as signed by default. */
4164 if (specbits & 1 << (int) RID_UNSIGNED
4165 /* Traditionally, all bitfields are unsigned. */
4166 || (bitfield && flag_traditional
4167 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4168 || (bitfield && ! flag_signed_bitfields
4169 && (explicit_int || defaulted_int || explicit_char
4170 /* A typedef for plain `int' without `signed'
4171 can be controlled just like plain `int'. */
4172 || ! (typedef_decl != 0
4173 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4174 && TREE_CODE (type) != ENUMERAL_TYPE
4175 && !(specbits & 1 << (int) RID_SIGNED)))
4178 type = long_long_unsigned_type_node;
4179 else if (specbits & 1 << (int) RID_LONG)
4180 type = long_unsigned_type_node;
4181 else if (specbits & 1 << (int) RID_SHORT)
4182 type = short_unsigned_type_node;
4183 else if (type == char_type_node)
4184 type = unsigned_char_type_node;
4185 else if (typedef_decl)
4186 type = unsigned_type (type);
4188 type = unsigned_type_node;
4190 else if ((specbits & 1 << (int) RID_SIGNED)
4191 && type == char_type_node)
4192 type = signed_char_type_node;
4194 type = long_long_integer_type_node;
4195 else if (specbits & 1 << (int) RID_LONG)
4196 type = long_integer_type_node;
4197 else if (specbits & 1 << (int) RID_SHORT)
4198 type = short_integer_type_node;
4200 if (specbits & 1 << (int) RID_COMPLEX)
4202 if (pedantic && !flag_isoc99)
4203 pedwarn ("ISO C89 does not support complex types");
4204 /* If we just have "complex", it is equivalent to
4205 "complex double", but if any modifiers at all are specified it is
4206 the complex form of TYPE. E.g, "complex short" is
4207 "complex short int". */
4209 if (defaulted_int && ! longlong
4210 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4211 | (1 << (int) RID_SIGNED)
4212 | (1 << (int) RID_UNSIGNED))))
4215 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
4216 type = complex_double_type_node;
4218 else if (type == integer_type_node)
4221 pedwarn ("ISO C does not support complex integer types");
4222 type = complex_integer_type_node;
4224 else if (type == float_type_node)
4225 type = complex_float_type_node;
4226 else if (type == double_type_node)
4227 type = complex_double_type_node;
4228 else if (type == long_double_type_node)
4229 type = complex_long_double_type_node;
4233 pedwarn ("ISO C does not support complex integer types");
4234 type = build_complex_type (type);
4238 /* Figure out the type qualifiers for the declaration. There are
4239 two ways a declaration can become qualified. One is something
4240 like `const int i' where the `const' is explicit. Another is
4241 something like `typedef const int CI; CI i' where the type of the
4242 declaration contains the `const'. */
4243 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4244 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
4245 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4246 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4247 if (constp > 1 && ! flag_isoc99)
4248 pedwarn ("duplicate `const'");
4249 if (restrictp > 1 && ! flag_isoc99)
4250 pedwarn ("duplicate `restrict'");
4251 if (volatilep > 1 && ! flag_isoc99)
4252 pedwarn ("duplicate `volatile'");
4253 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
4254 type = TYPE_MAIN_VARIANT (type);
4255 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4256 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4257 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4259 /* Warn if two storage classes are given. Default to `auto'. */
4264 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4265 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4266 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4267 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4268 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4270 /* Warn about storage classes that are invalid for certain
4271 kinds of declarations (parameters, typenames, etc.). */
4274 error ("multiple storage classes in declaration of `%s'", name);
4275 else if (funcdef_flag
4277 & ((1 << (int) RID_REGISTER)
4278 | (1 << (int) RID_AUTO)
4279 | (1 << (int) RID_TYPEDEF))))
4281 if (specbits & 1 << (int) RID_AUTO
4282 && (pedantic || current_binding_level == global_binding_level))
4283 pedwarn ("function definition declared `auto'");
4284 if (specbits & 1 << (int) RID_REGISTER)
4285 error ("function definition declared `register'");
4286 if (specbits & 1 << (int) RID_TYPEDEF)
4287 error ("function definition declared `typedef'");
4288 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4289 | (1 << (int) RID_AUTO));
4291 else if (decl_context != NORMAL && nclasses > 0)
4293 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4297 switch (decl_context)
4300 error ("storage class specified for structure field `%s'",
4304 error ("storage class specified for parameter `%s'", name);
4307 error ("storage class specified for typename");
4310 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4311 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4312 | (1 << (int) RID_EXTERN));
4315 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4317 /* `extern' with initialization is invalid if not at top level. */
4318 if (current_binding_level == global_binding_level)
4319 warning ("`%s' initialized and declared `extern'", name);
4321 error ("`%s' has both `extern' and initializer", name);
4323 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4324 && current_binding_level != global_binding_level)
4325 error ("nested function `%s' declared `extern'", name);
4326 else if (current_binding_level == global_binding_level
4327 && specbits & (1 << (int) RID_AUTO))
4328 error ("top-level declaration of `%s' specifies `auto'", name);
4331 /* Now figure out the structure of the declarator proper.
4332 Descend through it, creating more complex types, until we reach
4333 the declared identifier (or NULL_TREE, in an absolute declarator). */
4335 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4337 if (type == error_mark_node)
4339 declarator = TREE_OPERAND (declarator, 0);
4343 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4344 an INDIRECT_REF (for *...),
4345 a CALL_EXPR (for ...(...)),
4346 a TREE_LIST (for nested attributes),
4347 an identifier (for the name being declared)
4348 or a null pointer (for the place in an absolute declarator
4349 where the name was omitted).
4350 For the last two cases, we have just exited the loop.
4352 At this point, TYPE is the type of elements of an array,
4353 or for a function to return, or for a pointer to point to.
4354 After this sequence of ifs, TYPE is the type of the
4355 array or function or pointer, and DECLARATOR has had its
4356 outermost layer removed. */
4358 if (array_ptr_quals != NULL_TREE || array_parm_static)
4360 /* Only the innermost declarator (making a parameter be of
4361 array type which is converted to pointer type)
4362 may have static or type qualifiers. */
4363 error ("static or type qualifiers in non-parameter array declarator");
4364 array_ptr_quals = NULL_TREE;
4365 array_parm_static = 0;
4368 if (TREE_CODE (declarator) == TREE_LIST)
4370 /* We encode a declarator with embedded attributes using
4372 tree attrs = TREE_PURPOSE (declarator);
4375 declarator = TREE_VALUE (declarator);
4376 inner_decl = declarator;
4377 while (inner_decl != NULL_TREE
4378 && TREE_CODE (inner_decl) == TREE_LIST)
4379 inner_decl = TREE_VALUE (inner_decl);
4380 if (inner_decl == NULL_TREE
4381 || TREE_CODE (inner_decl) == IDENTIFIER_NODE)
4382 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
4383 if (TREE_CODE (inner_decl) == CALL_EXPR)
4384 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
4385 if (TREE_CODE (inner_decl) == ARRAY_REF)
4386 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
4387 returned_attrs = decl_attributes (&type,
4388 chainon (returned_attrs, attrs),
4391 else if (TREE_CODE (declarator) == ARRAY_REF)
4393 tree itype = NULL_TREE;
4394 tree size = TREE_OPERAND (declarator, 1);
4395 /* The index is a signed object `sizetype' bits wide. */
4396 tree index_type = signed_type (sizetype);
4398 array_ptr_quals = TREE_TYPE (declarator);
4399 array_parm_static = TREE_STATIC (declarator);
4401 declarator = TREE_OPERAND (declarator, 0);
4403 /* Check for some types that there cannot be arrays of. */
4405 if (VOID_TYPE_P (type))
4407 error ("declaration of `%s' as array of voids", name);
4408 type = error_mark_node;
4411 if (TREE_CODE (type) == FUNCTION_TYPE)
4413 error ("declaration of `%s' as array of functions", name);
4414 type = error_mark_node;
4417 if (size == error_mark_node)
4418 type = error_mark_node;
4420 if (type == error_mark_node)
4423 /* If size was specified, set ITYPE to a range-type for that size.
4424 Otherwise, ITYPE remains null. finish_decl may figure it out
4425 from an initial value. */
4429 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4430 STRIP_TYPE_NOPS (size);
4432 if (! INTEGRAL_TYPE_P (TREE_TYPE (size)))
4434 error ("size of array `%s' has non-integer type", name);
4435 size = integer_one_node;
4438 if (pedantic && integer_zerop (size))
4439 pedwarn ("ISO C forbids zero-size array `%s'", name);
4441 if (TREE_CODE (size) == INTEGER_CST)
4443 constant_expression_warning (size);
4444 if (tree_int_cst_sgn (size) < 0)
4446 error ("size of array `%s' is negative", name);
4447 size = integer_one_node;
4452 /* Make sure the array size remains visibly nonconstant
4453 even if it is (eg) a const variable with known value. */
4458 if (TREE_CONSTANT (size))
4459 pedwarn ("ISO C89 forbids array `%s' whose size can't be evaluated",
4462 pedwarn ("ISO C89 forbids variable-size array `%s'",
4467 if (integer_zerop (size))
4469 /* A zero-length array cannot be represented with an
4470 unsigned index type, which is what we'll get with
4471 build_index_type. Create an open-ended range instead. */
4472 itype = build_range_type (sizetype, size, NULL_TREE);
4476 /* Compute the maximum valid index, that is, size - 1.
4477 Do the calculation in index_type, so that if it is
4478 a variable the computations will be done in the
4480 itype = fold (build (MINUS_EXPR, index_type,
4481 convert (index_type, size),
4482 convert (index_type, size_one_node)));
4484 /* If that overflowed, the array is too big.
4485 ??? While a size of INT_MAX+1 technically shouldn't
4486 cause an overflow (because we subtract 1), the overflow
4487 is recorded during the conversion to index_type, before
4488 the subtraction. Handling this case seems like an
4489 unnecessary complication. */
4490 if (TREE_OVERFLOW (itype))
4492 error ("size of array `%s' is too large", name);
4493 type = error_mark_node;
4498 itype = variable_size (itype);
4499 itype = build_index_type (itype);
4502 else if (decl_context == FIELD)
4504 /* ??? Need to check somewhere that this is a structure
4505 and not a union, that this field is last, and that
4506 this structure has at least one other named member. */
4508 if (pedantic && !flag_isoc99 && !in_system_header)
4509 pedwarn ("ISO C89 does not support flexible array members");
4511 /* ISO C99 Flexible array members are effectively identical
4512 to GCC's zero-length array extension. */
4513 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4516 /* If pedantic, complain about arrays of incomplete types. */
4518 if (pedantic && !COMPLETE_TYPE_P (type))
4519 pedwarn ("array type has incomplete element type");
4522 /* We shouldn't have a function type here at all!
4523 Functions aren't allowed as array elements. */
4524 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4525 && (constp || volatilep))
4526 pedwarn ("ISO C forbids const or volatile function types");
4529 /* Build the array type itself, then merge any constancy or
4530 volatility into the target type. We must do it in this order
4531 to ensure that the TYPE_MAIN_VARIANT field of the array type
4532 is set correctly. */
4534 type = build_array_type (type, itype);
4536 type = c_build_qualified_type (type, type_quals);
4539 C_TYPE_VARIABLE_SIZE (type) = 1;
4541 /* The GCC extension for zero-length arrays differs from
4542 ISO flexible array members in that sizeof yields zero. */
4543 if (size && integer_zerop (size))
4546 TYPE_SIZE (type) = bitsize_zero_node;
4547 TYPE_SIZE_UNIT (type) = size_zero_node;
4549 if (decl_context != PARM
4550 && (array_ptr_quals != NULL_TREE || array_parm_static))
4552 error ("static or type qualifiers in non-parameter array declarator");
4553 array_ptr_quals = NULL_TREE;
4554 array_parm_static = 0;
4557 else if (TREE_CODE (declarator) == CALL_EXPR)
4561 /* Declaring a function type.
4562 Make sure we have a valid type for the function to return. */
4563 if (type == error_mark_node)
4568 /* Warn about some types functions can't return. */
4570 if (TREE_CODE (type) == FUNCTION_TYPE)
4572 error ("`%s' declared as function returning a function", name);
4573 type = integer_type_node;
4575 if (TREE_CODE (type) == ARRAY_TYPE)
4577 error ("`%s' declared as function returning an array", name);
4578 type = integer_type_node;
4581 #ifndef TRADITIONAL_RETURN_FLOAT
4582 /* Traditionally, declaring return type float means double. */
4584 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4585 type = double_type_node;
4586 #endif /* TRADITIONAL_RETURN_FLOAT */
4588 /* Construct the function type and go to the next
4589 inner layer of declarator. */
4591 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4593 /* Say it's a definition
4594 only for the CALL_EXPR
4595 closest to the identifier. */
4596 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4597 /* Type qualifiers before the return type of the function
4598 qualify the return type, not the function type. */
4601 /* Type qualifiers on a function return type are normally
4602 permitted by the standard but have no effect, so give a
4603 warning at -W. Qualifiers on a void return type have
4604 meaning as a GNU extension, and are banned on function
4605 definitions in ISO C. FIXME: strictly we shouldn't
4606 pedwarn for qualified void return types except on function
4607 definitions, but not doing so could lead to the undesirable
4608 state of a "volatile void" function return type not being
4609 warned about, and a use of the function being compiled
4610 with GNU semantics, with no diagnostics under -pedantic. */
4611 if (VOID_TYPE_P (type) && pedantic && !in_system_header)
4612 pedwarn ("ISO C forbids qualified void function return type");
4613 else if (extra_warnings
4614 && !(VOID_TYPE_P (type)
4615 && type_quals == TYPE_QUAL_VOLATILE))
4616 warning ("type qualifiers ignored on function return type");
4618 type = c_build_qualified_type (type, type_quals);
4620 type_quals = TYPE_UNQUALIFIED;
4622 type = build_function_type (type, arg_types);
4623 declarator = TREE_OPERAND (declarator, 0);
4625 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4626 the formal parameter list of this FUNCTION_TYPE to point to
4627 the FUNCTION_TYPE node itself. */
4632 for (link = last_function_parm_tags;
4634 link = TREE_CHAIN (link))
4635 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4638 else if (TREE_CODE (declarator) == INDIRECT_REF)
4640 /* Merge any constancy or volatility into the target type
4643 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4645 pedwarn ("ISO C forbids qualified function types");
4647 type = c_build_qualified_type (type, type_quals);
4648 type_quals = TYPE_UNQUALIFIED;
4651 type = build_pointer_type (type);
4653 /* Process a list of type modifier keywords
4654 (such as const or volatile) that were given inside the `*'. */
4656 if (TREE_TYPE (declarator))
4664 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4665 typemodlist = TREE_CHAIN (typemodlist))
4667 tree qualifier = TREE_VALUE (typemodlist);
4669 if (C_IS_RESERVED_WORD (qualifier))
4671 if (C_RID_CODE (qualifier) == RID_CONST)
4673 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4675 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4685 error ("invalid type modifier within pointer declarator");
4686 if (constp > 1 && ! flag_isoc99)
4687 pedwarn ("duplicate `const'");
4688 if (volatilep > 1 && ! flag_isoc99)
4689 pedwarn ("duplicate `volatile'");
4690 if (restrictp > 1 && ! flag_isoc99)
4691 pedwarn ("duplicate `restrict'");
4693 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4694 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4695 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4698 declarator = TREE_OPERAND (declarator, 0);
4705 /* Now TYPE has the actual type. */
4707 /* Did array size calculations overflow? */
4709 if (TREE_CODE (type) == ARRAY_TYPE
4710 && COMPLETE_TYPE_P (type)
4711 && TREE_OVERFLOW (TYPE_SIZE (type)))
4713 error ("size of array `%s' is too large", name);
4714 /* If we proceed with the array type as it is, we'll eventually
4715 crash in tree_low_cst(). */
4716 type = error_mark_node;
4719 /* If this is declaring a typedef name, return a TYPE_DECL. */
4721 if (specbits & (1 << (int) RID_TYPEDEF))
4724 /* Note that the grammar rejects storage classes
4725 in typenames, fields or parameters */
4726 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4728 pedwarn ("ISO C forbids qualified function types");
4730 type = c_build_qualified_type (type, type_quals);
4731 decl = build_decl (TYPE_DECL, declarator, type);
4732 if ((specbits & (1 << (int) RID_SIGNED))
4733 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4734 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4735 decl_attributes (&decl, returned_attrs, 0);
4739 /* Detect the case of an array type of unspecified size
4740 which came, as such, direct from a typedef name.
4741 We must copy the type, so that each identifier gets
4742 a distinct type, so that each identifier's size can be
4743 controlled separately by its own initializer. */
4745 if (type != 0 && typedef_type != 0
4746 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4747 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4749 type = build_array_type (TREE_TYPE (type), 0);
4751 C_TYPE_VARIABLE_SIZE (type) = 1;
4754 /* If this is a type name (such as, in a cast or sizeof),
4755 compute the type and return it now. */
4757 if (decl_context == TYPENAME)
4759 /* Note that the grammar rejects storage classes
4760 in typenames, fields or parameters */
4761 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4763 pedwarn ("ISO C forbids const or volatile function types");
4765 type = c_build_qualified_type (type, type_quals);
4766 decl_attributes (&type, returned_attrs, 0);
4770 /* Aside from typedefs and type names (handle above),
4771 `void' at top level (not within pointer)
4772 is allowed only in public variables.
4773 We don't complain about parms either, but that is because
4774 a better error message can be made later. */
4776 if (VOID_TYPE_P (type) && decl_context != PARM
4777 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4778 && ((specbits & (1 << (int) RID_EXTERN))
4779 || (current_binding_level == global_binding_level
4781 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4783 error ("variable or field `%s' declared void", name);
4784 type = integer_type_node;
4787 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4788 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4793 if (decl_context == PARM)
4795 tree type_as_written;
4798 /* A parameter declared as an array of T is really a pointer to T.
4799 One declared as a function is really a pointer to a function. */
4801 if (TREE_CODE (type) == ARRAY_TYPE)
4803 /* Transfer const-ness of array into that of type pointed to. */
4804 type = TREE_TYPE (type);
4806 type = c_build_qualified_type (type, type_quals);
4807 type = build_pointer_type (type);
4808 type_quals = TYPE_UNQUALIFIED;
4809 if (array_ptr_quals)
4811 tree new_ptr_quals, new_ptr_attrs;
4813 split_specs_attrs (array_ptr_quals, &new_ptr_quals, &new_ptr_attrs);
4814 /* We don't yet implement attributes in this context. */
4815 if (new_ptr_attrs != NULL_TREE)
4816 warning ("attributes in parameter array declarator ignored");
4821 for (; new_ptr_quals; new_ptr_quals = TREE_CHAIN (new_ptr_quals))
4823 tree qualifier = TREE_VALUE (new_ptr_quals);
4825 if (C_IS_RESERVED_WORD (qualifier))
4827 if (C_RID_CODE (qualifier) == RID_CONST)
4829 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4831 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4841 error ("invalid type modifier within array declarator");
4843 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4844 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4845 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4849 else if (TREE_CODE (type) == FUNCTION_TYPE)
4851 if (pedantic && type_quals)
4852 pedwarn ("ISO C forbids qualified function types");
4854 type = c_build_qualified_type (type, type_quals);
4855 type = build_pointer_type (type);
4856 type_quals = TYPE_UNQUALIFIED;
4858 else if (type_quals)
4859 type = c_build_qualified_type (type, type_quals);
4861 type_as_written = type;
4863 decl = build_decl (PARM_DECL, declarator, type);
4865 C_DECL_VARIABLE_SIZE (decl) = 1;
4867 /* Compute the type actually passed in the parmlist,
4868 for the case where there is no prototype.
4869 (For example, shorts and chars are passed as ints.)
4870 When there is a prototype, this is overridden later. */
4872 if (type == error_mark_node)
4873 promoted_type = type;
4876 promoted_type = simple_type_promotes_to (type);
4877 if (! promoted_type)
4878 promoted_type = type;
4881 DECL_ARG_TYPE (decl) = promoted_type;
4882 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4884 else if (decl_context == FIELD)
4886 /* Structure field. It may not be a function. */
4888 if (TREE_CODE (type) == FUNCTION_TYPE)
4890 error ("field `%s' declared as a function", name);
4891 type = build_pointer_type (type);
4893 else if (TREE_CODE (type) != ERROR_MARK
4894 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4896 error ("field `%s' has incomplete type", name);
4897 type = error_mark_node;
4899 /* Move type qualifiers down to element of an array. */
4900 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4902 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4904 TYPE_DOMAIN (type));
4906 /* Leave the field const or volatile as well. */
4907 type_quals = TYPE_UNQUALIFIED;
4910 decl = build_decl (FIELD_DECL, declarator, type);
4911 DECL_NONADDRESSABLE_P (decl) = bitfield;
4914 C_DECL_VARIABLE_SIZE (decl) = 1;
4916 else if (TREE_CODE (type) == FUNCTION_TYPE)
4918 /* Every function declaration is "external"
4919 except for those which are inside a function body
4920 in which `auto' is used.
4921 That is a case not specified by ANSI C,
4922 and we use it for forward declarations for nested functions. */
4923 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4924 || current_binding_level == global_binding_level);
4926 if (specbits & (1 << (int) RID_AUTO)
4927 && (pedantic || current_binding_level == global_binding_level))
4928 pedwarn ("invalid storage class for function `%s'", name);
4929 if (specbits & (1 << (int) RID_REGISTER))
4930 error ("invalid storage class for function `%s'", name);
4931 /* Function declaration not at top level.
4932 Storage classes other than `extern' are not allowed
4933 and `extern' makes no difference. */
4934 if (current_binding_level != global_binding_level
4935 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4937 pedwarn ("invalid storage class for function `%s'", name);
4939 decl = build_decl (FUNCTION_DECL, declarator, type);
4940 decl = build_decl_attribute_variant (decl, decl_attr);
4942 DECL_LANG_SPECIFIC (decl) = (struct lang_decl *)
4943 ggc_alloc_cleared (sizeof (struct lang_decl));
4945 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4946 pedwarn ("ISO C forbids qualified function types");
4948 /* GNU C interprets a `volatile void' return type to indicate
4949 that the function does not return. */
4950 if ((type_quals & TYPE_QUAL_VOLATILE)
4951 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4952 warning ("`noreturn' function returns non-void value");
4955 DECL_EXTERNAL (decl) = 1;
4956 /* Record absence of global scope for `static' or `auto'. */
4958 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4960 /* Record presence of `inline', if it is reasonable. */
4961 if (MAIN_NAME_P (declarator))
4964 warning ("cannot inline function `main'");
4968 /* Assume that otherwise the function can be inlined. */
4969 DECL_INLINE (decl) = 1;
4970 DECL_DECLARED_INLINE_P (decl) = 1;
4972 if (specbits & (1 << (int) RID_EXTERN))
4973 current_extern_inline = 1;
4975 /* If -finline-functions, assume it can be inlined. This does
4976 two things: let the function be deferred until it is actually
4977 needed, and let dwarf2 know that the function is inlinable. */
4978 else if (flag_inline_trees == 2)
4980 DECL_INLINE (decl) = 1;
4981 DECL_DECLARED_INLINE_P (decl) = 0;
4986 /* It's a variable. */
4987 /* An uninitialized decl with `extern' is a reference. */
4988 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4990 /* Move type qualifiers down to element of an array. */
4991 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4993 int saved_align = TYPE_ALIGN(type);
4994 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4996 TYPE_DOMAIN (type));
4997 TYPE_ALIGN (type) = saved_align;
4998 #if 0 /* Leave the variable const or volatile as well. */
4999 type_quals = TYPE_UNQUALIFIED;
5002 else if (type_quals)
5003 type = c_build_qualified_type (type, type_quals);
5005 decl = build_decl (VAR_DECL, declarator, type);
5007 C_DECL_VARIABLE_SIZE (decl) = 1;
5010 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
5012 DECL_EXTERNAL (decl) = extern_ref;
5013 /* At top level, the presence of a `static' or `register' storage
5014 class specifier, or the absence of all storage class specifiers
5015 makes this declaration a definition (perhaps tentative). Also,
5016 the absence of both `static' and `register' makes it public. */
5017 if (current_binding_level == global_binding_level)
5021 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
5022 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
5024 /* Not at top level, only `static' makes a static definition. */
5027 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
5028 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
5032 /* Record `register' declaration for warnings on &
5033 and in case doing stupid register allocation. */
5035 if (specbits & (1 << (int) RID_REGISTER))
5036 DECL_REGISTER (decl) = 1;
5038 /* Record constancy and volatility. */
5039 c_apply_type_quals_to_decl (type_quals, decl);
5041 /* If a type has volatile components, it should be stored in memory.
5042 Otherwise, the fact that those components are volatile
5043 will be ignored, and would even crash the compiler. */
5044 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
5045 mark_addressable (decl);
5047 decl_attributes (&decl, returned_attrs, 0);
5053 /* Decode the parameter-list info for a function type or function definition.
5054 The argument is the value returned by `get_parm_info' (or made in parse.y
5055 if there is an identifier list instead of a parameter decl list).
5056 These two functions are separate because when a function returns
5057 or receives functions then each is called multiple times but the order
5058 of calls is different. The last call to `grokparms' is always the one
5059 that contains the formal parameter names of a function definition.
5061 Store in `last_function_parms' a chain of the decls of parms.
5062 Also store in `last_function_parm_tags' a chain of the struct, union,
5063 and enum tags declared among the parms.
5065 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5067 FUNCDEF_FLAG is nonzero for a function definition, 0 for
5068 a mere declaration. A nonempty identifier-list gets an error message
5069 when FUNCDEF_FLAG is zero. */
5072 grokparms (parms_info, funcdef_flag)
5076 tree first_parm = TREE_CHAIN (parms_info);
5078 last_function_parms = TREE_PURPOSE (parms_info);
5079 last_function_parm_tags = TREE_VALUE (parms_info);
5081 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
5082 && !in_system_header)
5083 warning ("function declaration isn't a prototype");
5086 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
5089 pedwarn ("parameter names (without types) in function declaration");
5091 last_function_parms = first_parm;
5098 /* We no longer test FUNCDEF_FLAG.
5099 If the arg types are incomplete in a declaration,
5100 they must include undefined tags.
5101 These tags can never be defined in the scope of the declaration,
5102 so the types can never be completed,
5103 and no call can be compiled successfully. */
5105 /* In a fcn definition, arg types must be complete. */
5108 for (parm = last_function_parms, typelt = first_parm;
5110 parm = TREE_CHAIN (parm))
5111 /* Skip over any enumeration constants declared here. */
5112 if (TREE_CODE (parm) == PARM_DECL)
5114 /* Barf if the parameter itself has an incomplete type. */
5115 tree type = TREE_VALUE (typelt);
5116 if (type == error_mark_node)
5118 if (!COMPLETE_TYPE_P (type))
5120 if (funcdef_flag && DECL_NAME (parm) != 0)
5121 error ("parameter `%s' has incomplete type",
5122 IDENTIFIER_POINTER (DECL_NAME (parm)));
5124 warning ("parameter has incomplete type");
5127 TREE_VALUE (typelt) = error_mark_node;
5128 TREE_TYPE (parm) = error_mark_node;
5132 /* This has been replaced by parm_tags_warning, which
5133 uses a more accurate criterion for what to warn
5137 /* Now warn if is a pointer to an incomplete type. */
5138 while (TREE_CODE (type) == POINTER_TYPE
5139 || TREE_CODE (type) == REFERENCE_TYPE)
5140 type = TREE_TYPE (type);
5141 type = TYPE_MAIN_VARIANT (type);
5142 if (!COMPLETE_TYPE_P (type))
5144 if (DECL_NAME (parm) != 0)
5145 warning ("parameter `%s' points to incomplete type",
5146 IDENTIFIER_POINTER (DECL_NAME (parm)));
5148 warning ("parameter points to incomplete type");
5152 typelt = TREE_CHAIN (typelt);
5159 /* Return a tree_list node with info on a parameter list just parsed.
5160 The TREE_PURPOSE is a chain of decls of those parms.
5161 The TREE_VALUE is a list of structure, union and enum tags defined.
5162 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5163 This tree_list node is later fed to `grokparms'.
5165 VOID_AT_END nonzero means append `void' to the end of the type-list.
5166 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5169 get_parm_info (void_at_end)
5175 tree tags = gettags ();
5176 tree parms = getdecls ();
5178 tree order = current_binding_level->parm_order;
5180 /* Just `void' (and no ellipsis) is special. There are really no parms.
5181 But if the `void' is qualified (by `const' or `volatile') or has a
5182 storage class specifier (`register'), then the behavior is undefined;
5183 by not counting it as the special case of `void' we will cause an
5184 error later. Typedefs for `void' are OK (see DR#157). */
5185 if (void_at_end && parms != 0
5186 && TREE_CHAIN (parms) == 0
5187 && VOID_TYPE_P (TREE_TYPE (parms))
5188 && ! TREE_THIS_VOLATILE (parms)
5189 && ! TREE_READONLY (parms)
5190 && ! DECL_REGISTER (parms)
5191 && DECL_NAME (parms) == 0)
5194 storedecls (NULL_TREE);
5195 return tree_cons (NULL_TREE, NULL_TREE,
5196 tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5199 /* Extract enumerator values and other non-parms declared with the parms.
5200 Likewise any forward parm decls that didn't have real parm decls. */
5201 for (decl = parms; decl;)
5203 tree next = TREE_CHAIN (decl);
5205 if (TREE_CODE (decl) != PARM_DECL)
5207 TREE_CHAIN (decl) = new_parms;
5210 else if (TREE_ASM_WRITTEN (decl))
5212 error_with_decl (decl,
5213 "parameter `%s' has just a forward declaration");
5214 TREE_CHAIN (decl) = new_parms;
5220 /* Put the parm decls back in the order they were in in the parm list. */
5221 for (t = order; t; t = TREE_CHAIN (t))
5224 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5226 TREE_CHAIN (TREE_VALUE (t)) = 0;
5229 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5232 /* Store the parmlist in the binding level since the old one
5233 is no longer a valid list. (We have changed the chain pointers.) */
5234 storedecls (new_parms);
5236 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5237 /* There may also be declarations for enumerators if an enumeration
5238 type is declared among the parms. Ignore them here. */
5239 if (TREE_CODE (decl) == PARM_DECL)
5241 /* Since there is a prototype,
5242 args are passed in their declared types. */
5243 tree type = TREE_TYPE (decl);
5244 DECL_ARG_TYPE (decl) = type;
5245 if (PROMOTE_PROTOTYPES
5246 && INTEGRAL_TYPE_P (type)
5247 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5248 DECL_ARG_TYPE (decl) = integer_type_node;
5250 types = tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5251 if (VOID_TYPE_P (TREE_VALUE (types)) && ! erred
5252 && DECL_NAME (decl) == 0)
5254 error ("`void' in parameter list must be the entire list");
5260 return tree_cons (new_parms, tags,
5261 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
5263 return tree_cons (new_parms, tags, nreverse (types));
5266 /* At end of parameter list, warn about any struct, union or enum tags
5267 defined within. Do so because these types cannot ever become complete. */
5270 parmlist_tags_warning ()
5275 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5277 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5278 /* An anonymous union parm type is meaningful as a GNU extension.
5279 So don't warn for that. */
5280 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5282 if (TREE_PURPOSE (elt) != 0)
5284 if (code == RECORD_TYPE)
5285 warning ("`struct %s' declared inside parameter list",
5286 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5287 else if (code == UNION_TYPE)
5288 warning ("`union %s' declared inside parameter list",
5289 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5291 warning ("`enum %s' declared inside parameter list",
5292 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5296 /* For translation these need to be separate warnings */
5297 if (code == RECORD_TYPE)
5298 warning ("anonymous struct declared inside parameter list");
5299 else if (code == UNION_TYPE)
5300 warning ("anonymous union declared inside parameter list");
5302 warning ("anonymous enum declared inside parameter list");
5306 warning ("its scope is only this definition or declaration, which is probably not what you want");
5312 /* Get the struct, enum or union (CODE says which) with tag NAME.
5313 Define the tag as a forward-reference if it is not defined. */
5316 xref_tag (code, name)
5317 enum tree_code code;
5320 /* If a cross reference is requested, look up the type
5321 already defined for this tag and return it. */
5323 tree ref = lookup_tag (code, name, current_binding_level, 0);
5324 /* If this is the right type of tag, return what we found.
5325 (This reference will be shadowed by shadow_tag later if appropriate.)
5326 If this is the wrong type of tag, do not return it. If it was the
5327 wrong type in the same binding level, we will have had an error
5328 message already; if in a different binding level and declaring
5329 a name, pending_xref_error will give an error message; but if in a
5330 different binding level and not declaring a name, this tag should
5331 shadow the previous declaration of a different type of tag, and
5332 this would not work properly if we return the reference found.
5333 (For example, with "struct foo" in an outer scope, "union foo;"
5334 must shadow that tag with a new one of union type.) */
5335 if (ref && TREE_CODE (ref) == code)
5338 /* If no such tag is yet defined, create a forward-reference node
5339 and record it as the "definition".
5340 When a real declaration of this type is found,
5341 the forward-reference will be altered into a real type. */
5343 ref = make_node (code);
5344 if (code == ENUMERAL_TYPE)
5346 /* Give the type a default layout like unsigned int
5347 to avoid crashing if it does not get defined. */
5348 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5349 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5350 TYPE_USER_ALIGN (ref) = 0;
5351 TREE_UNSIGNED (ref) = 1;
5352 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5353 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5354 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5357 pushtag (name, ref);
5362 /* Make sure that the tag NAME is defined *in the current binding level*
5363 at least as a forward reference.
5364 CODE says which kind of tag NAME ought to be. */
5367 start_struct (code, name)
5368 enum tree_code code;
5371 /* If there is already a tag defined at this binding level
5372 (as a forward reference), just return it. */
5377 ref = lookup_tag (code, name, current_binding_level, 1);
5378 if (ref && TREE_CODE (ref) == code)
5380 C_TYPE_BEING_DEFINED (ref) = 1;
5381 TYPE_PACKED (ref) = flag_pack_struct;
5382 if (TYPE_FIELDS (ref))
5384 if (code == UNION_TYPE)
5385 error ("redefinition of `union %s'",
5386 IDENTIFIER_POINTER (name));
5388 error ("redefinition of `struct %s'",
5389 IDENTIFIER_POINTER (name));
5395 /* Otherwise create a forward-reference just so the tag is in scope. */
5397 ref = make_node (code);
5398 pushtag (name, ref);
5399 C_TYPE_BEING_DEFINED (ref) = 1;
5400 TYPE_PACKED (ref) = flag_pack_struct;
5404 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5405 of a structure component, returning a FIELD_DECL node.
5406 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5408 This is done during the parsing of the struct declaration.
5409 The FIELD_DECL nodes are chained together and the lot of them
5410 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5413 grokfield (filename, line, declarator, declspecs, width)
5414 const char *filename ATTRIBUTE_UNUSED;
5415 int line ATTRIBUTE_UNUSED;
5416 tree declarator, declspecs, width;
5420 if (declarator == NULL_TREE && width == NULL_TREE)
5422 /* This is an unnamed decl. We only support unnamed
5423 structs/unions, so check for other things and refuse them. */
5424 if (TREE_CODE (TREE_VALUE (declspecs)) != RECORD_TYPE
5425 && TREE_CODE (TREE_VALUE (declspecs)) != UNION_TYPE)
5427 error ("unnamed fields of type other than struct or union are not allowed");
5432 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5434 finish_decl (value, NULL_TREE, NULL_TREE);
5435 DECL_INITIAL (value) = width;
5437 maybe_objc_check_decl (value);
5441 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5442 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5443 ATTRIBUTES are attributes to be applied to the structure. */
5446 finish_struct (t, fieldlist, attributes)
5452 int toplevel = global_binding_level == current_binding_level;
5453 int saw_named_field;
5455 /* If this type was previously laid out as a forward reference,
5456 make sure we lay it out again. */
5460 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5462 /* Nameless union parm types are useful as GCC extension. */
5463 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5464 /* Otherwise, warn about any struct or union def. in parmlist. */
5465 if (in_parm_level_p ())
5468 pedwarn ("%s defined inside parms",
5469 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5470 else if (! flag_traditional)
5471 warning ("%s defined inside parms",
5472 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5477 for (x = fieldlist; x; x = TREE_CHAIN (x))
5478 if (DECL_NAME (x) != 0)
5482 pedwarn ("%s has no %s",
5483 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
5484 fieldlist ? _("named members") : _("members"));
5487 /* Install struct as DECL_CONTEXT of each field decl.
5488 Also process specified field sizes,m which is found in the DECL_INITIAL.
5489 Store 0 there, except for ": 0" fields (so we can find them
5490 and delete them, below). */
5492 saw_named_field = 0;
5493 for (x = fieldlist; x; x = TREE_CHAIN (x))
5495 DECL_CONTEXT (x) = t;
5496 DECL_PACKED (x) |= TYPE_PACKED (t);
5498 /* If any field is const, the structure type is pseudo-const. */
5499 if (TREE_READONLY (x))
5500 C_TYPE_FIELDS_READONLY (t) = 1;
5503 /* A field that is pseudo-const makes the structure likewise. */
5504 tree t1 = TREE_TYPE (x);
5505 while (TREE_CODE (t1) == ARRAY_TYPE)
5506 t1 = TREE_TYPE (t1);
5507 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5508 && C_TYPE_FIELDS_READONLY (t1))
5509 C_TYPE_FIELDS_READONLY (t) = 1;
5512 /* Any field that is volatile means variables of this type must be
5513 treated in some ways as volatile. */
5514 if (TREE_THIS_VOLATILE (x))
5515 C_TYPE_FIELDS_VOLATILE (t) = 1;
5517 /* Any field of nominal variable size implies structure is too. */
5518 if (C_DECL_VARIABLE_SIZE (x))
5519 C_TYPE_VARIABLE_SIZE (t) = 1;
5521 /* Detect invalid nested redefinition. */
5522 if (TREE_TYPE (x) == t)
5523 error ("nested redefinition of `%s'",
5524 IDENTIFIER_POINTER (TYPE_NAME (t)));
5526 /* Detect invalid bit-field size. */
5527 if (DECL_INITIAL (x))
5528 STRIP_NOPS (DECL_INITIAL (x));
5529 if (DECL_INITIAL (x))
5531 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5532 constant_expression_warning (DECL_INITIAL (x));
5536 "bit-field `%s' width not an integer constant");
5537 DECL_INITIAL (x) = NULL;
5541 /* Detect invalid bit-field type. */
5542 if (DECL_INITIAL (x)
5543 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5544 && TREE_CODE (TREE_TYPE (x)) != BOOLEAN_TYPE
5545 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5547 error_with_decl (x, "bit-field `%s' has invalid type");
5548 DECL_INITIAL (x) = NULL;
5551 if (DECL_INITIAL (x) && pedantic
5552 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5553 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5554 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != c_bool_type_node
5555 /* Accept an enum that's equivalent to int or unsigned int. */
5556 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5557 && (TYPE_PRECISION (TREE_TYPE (x))
5558 == TYPE_PRECISION (integer_type_node))))
5559 pedwarn_with_decl (x, "bit-field `%s' type invalid in ISO C");
5561 /* Detect and ignore out of range field width and process valid
5563 if (DECL_INITIAL (x))
5566 if (TYPE_MAIN_VARIANT (TREE_TYPE (x)) == c_bool_type_node)
5567 max_width = CHAR_TYPE_SIZE;
5569 max_width = TYPE_PRECISION (TREE_TYPE (x));
5570 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5571 error_with_decl (x, "negative width in bit-field `%s'");
5572 else if (0 < compare_tree_int (DECL_INITIAL (x), max_width))
5573 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5574 else if (integer_zerop (DECL_INITIAL (x)) && DECL_NAME (x) != 0)
5575 error_with_decl (x, "zero width for bit-field `%s'");
5578 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
5579 unsigned HOST_WIDE_INT width
5580 = TREE_INT_CST_LOW (DECL_INITIAL (x));
5582 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5583 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5584 TREE_UNSIGNED (TREE_TYPE (x)))
5586 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5587 TREE_UNSIGNED (TREE_TYPE (x))))))
5588 warning_with_decl (x,
5589 "`%s' is narrower than values of its type");
5591 DECL_SIZE (x) = bitsize_int (width);
5592 DECL_BIT_FIELD (x) = 1;
5593 SET_DECL_C_BIT_FIELD (x);
5597 /* field size 0 => force desired amount of alignment. */
5598 #ifdef EMPTY_FIELD_BOUNDARY
5599 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5601 #ifdef PCC_BITFIELD_TYPE_MATTERS
5602 if (PCC_BITFIELD_TYPE_MATTERS)
5604 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5605 TYPE_ALIGN (TREE_TYPE (x)));
5606 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5613 else if (TREE_TYPE (x) != error_mark_node)
5615 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5616 : TYPE_ALIGN (TREE_TYPE (x)));
5618 /* Non-bit-fields are aligned for their type, except packed
5619 fields which require only BITS_PER_UNIT alignment. */
5620 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5621 if (! DECL_PACKED (x))
5622 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5625 DECL_INITIAL (x) = 0;
5627 /* Detect flexible array member in an invalid context. */
5628 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5629 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5630 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5631 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5633 if (TREE_CODE (t) == UNION_TYPE)
5634 error_with_decl (x, "flexible array member in union");
5635 else if (TREE_CHAIN (x) != NULL_TREE)
5636 error_with_decl (x, "flexible array member not at end of struct");
5637 else if (! saw_named_field)
5638 error_with_decl (x, "flexible array member in otherwise empty struct");
5641 saw_named_field = 1;
5644 /* Delete all duplicate fields from the fieldlist */
5645 for (x = fieldlist; x && TREE_CHAIN (x);)
5646 /* Anonymous fields aren't duplicates. */
5647 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5655 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5661 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5663 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5664 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5670 /* Now we have the nearly final fieldlist. Record it,
5671 then lay out the structure or union (including the fields). */
5673 TYPE_FIELDS (t) = fieldlist;
5677 /* Delete all zero-width bit-fields from the fieldlist */
5679 tree *fieldlistp = &fieldlist;
5681 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5682 *fieldlistp = TREE_CHAIN (*fieldlistp);
5684 fieldlistp = &TREE_CHAIN (*fieldlistp);
5687 /* Now we have the truly final field list.
5688 Store it in this type and in the variants. */
5690 TYPE_FIELDS (t) = fieldlist;
5692 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5694 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5695 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5696 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5697 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5700 /* If this was supposed to be a transparent union, but we can't
5701 make it one, warn and turn off the flag. */
5702 if (TREE_CODE (t) == UNION_TYPE
5703 && TYPE_TRANSPARENT_UNION (t)
5704 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5706 TYPE_TRANSPARENT_UNION (t) = 0;
5707 warning ("union cannot be made transparent");
5710 /* If this structure or union completes the type of any previous
5711 variable declaration, lay it out and output its rtl. */
5713 if (current_binding_level->n_incomplete != 0)
5716 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5718 if (TYPE_MAIN_VARIANT (TREE_TYPE (decl)) == TYPE_MAIN_VARIANT (t)
5719 && TREE_CODE (decl) != TYPE_DECL)
5721 layout_decl (decl, 0);
5722 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5723 maybe_objc_check_decl (decl);
5724 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5727 --current_binding_level->n_incomplete;
5729 else if (!COMPLETE_TYPE_P (TREE_TYPE (decl))
5730 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5732 tree element = TREE_TYPE (decl);
5733 while (TREE_CODE (element) == ARRAY_TYPE)
5734 element = TREE_TYPE (element);
5736 layout_array_type (TREE_TYPE (decl));
5741 /* Finish debugging output for this type. */
5742 rest_of_type_compilation (t, toplevel);
5747 /* Lay out the type T, and its element type, and so on. */
5750 layout_array_type (t)
5753 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5754 layout_array_type (TREE_TYPE (t));
5758 /* Begin compiling the definition of an enumeration type.
5759 NAME is its name (or null if anonymous).
5760 Returns the type object, as yet incomplete.
5761 Also records info about it so that build_enumerator
5762 may be used to declare the individual values as they are read. */
5770 /* If this is the real definition for a previous forward reference,
5771 fill in the contents in the same object that used to be the
5772 forward reference. */
5775 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5777 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5779 enumtype = make_node (ENUMERAL_TYPE);
5780 pushtag (name, enumtype);
5783 C_TYPE_BEING_DEFINED (enumtype) = 1;
5785 if (TYPE_VALUES (enumtype) != 0)
5787 /* This enum is a named one that has been declared already. */
5788 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5790 /* Completely replace its old definition.
5791 The old enumerators remain defined, however. */
5792 TYPE_VALUES (enumtype) = 0;
5795 enum_next_value = integer_zero_node;
5798 if (flag_short_enums)
5799 TYPE_PACKED (enumtype) = 1;
5804 /* After processing and defining all the values of an enumeration type,
5805 install their decls in the enumeration type and finish it off.
5806 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5807 and ATTRIBUTES are the specified attributes.
5808 Returns ENUMTYPE. */
5811 finish_enum (enumtype, values, attributes)
5817 tree minnode = 0, maxnode = 0, enum_value_type;
5818 int precision, unsign;
5819 int toplevel = (global_binding_level == current_binding_level);
5821 if (in_parm_level_p ())
5822 warning ("enum defined inside parms");
5824 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5826 /* Calculate the maximum value of any enumerator in this type. */
5828 if (values == error_mark_node)
5829 minnode = maxnode = integer_zero_node;
5832 minnode = maxnode = TREE_VALUE (values);
5833 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5835 tree value = TREE_VALUE (pair);
5836 if (tree_int_cst_lt (maxnode, value))
5838 if (tree_int_cst_lt (value, minnode))
5843 /* Construct the final type of this enumeration. It is the same
5844 as one of the integral types - the narrowest one that fits, except
5845 that normally we only go as narrow as int - and signed iff any of
5846 the values are negative. */
5847 unsign = (tree_int_cst_sgn (minnode) >= 0);
5848 precision = MAX (min_precision (minnode, unsign),
5849 min_precision (maxnode, unsign));
5850 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5852 tree narrowest = type_for_size (precision, unsign);
5855 warning ("enumeration values exceed range of largest integer");
5856 narrowest = long_long_integer_type_node;
5859 precision = TYPE_PRECISION (narrowest);
5862 precision = TYPE_PRECISION (integer_type_node);
5864 if (precision == TYPE_PRECISION (integer_type_node))
5865 enum_value_type = type_for_size (precision, 0);
5867 enum_value_type = enumtype;
5869 TYPE_MIN_VALUE (enumtype) = minnode;
5870 TYPE_MAX_VALUE (enumtype) = maxnode;
5871 TYPE_PRECISION (enumtype) = precision;
5872 TREE_UNSIGNED (enumtype) = unsign;
5873 TYPE_SIZE (enumtype) = 0;
5874 layout_type (enumtype);
5876 if (values != error_mark_node)
5878 /* Change the type of the enumerators to be the enum type. We
5879 need to do this irrespective of the size of the enum, for
5880 proper type checking. Replace the DECL_INITIALs of the
5881 enumerators, and the value slots of the list, with copies
5882 that have the enum type; they cannot be modified in place
5883 because they may be shared (e.g. integer_zero_node) Finally,
5884 change the purpose slots to point to the names of the decls. */
5885 for (pair = values; pair; pair = TREE_CHAIN (pair))
5887 tree enu = TREE_PURPOSE (pair);
5889 TREE_TYPE (enu) = enumtype;
5890 DECL_SIZE (enu) = TYPE_SIZE (enumtype);
5891 DECL_SIZE_UNIT (enu) = TYPE_SIZE_UNIT (enumtype);
5892 DECL_ALIGN (enu) = TYPE_ALIGN (enumtype);
5893 DECL_USER_ALIGN (enu) = TYPE_USER_ALIGN (enumtype);
5894 DECL_MODE (enu) = TYPE_MODE (enumtype);
5896 /* The ISO C Standard mandates enumerators to have type int,
5897 even though the underlying type of an enum type is
5898 unspecified. Here we convert any enumerators that fit in
5899 an int to type int, to avoid promotions to unsigned types
5900 when comparing integers with enumerators that fit in the
5901 int range. When -pedantic is given, build_enumerator()
5902 would have already taken care of those that don't fit. */
5903 if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
5904 DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
5906 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5908 TREE_PURPOSE (pair) = DECL_NAME (enu);
5909 TREE_VALUE (pair) = DECL_INITIAL (enu);
5912 TYPE_VALUES (enumtype) = values;
5915 /* Fix up all variant types of this enum type. */
5916 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5918 if (tem == enumtype)
5920 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5921 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5922 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5923 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5924 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5925 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5926 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5927 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5928 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5929 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5932 /* Finish debugging output for this type. */
5933 rest_of_type_compilation (enumtype, toplevel);
5938 /* Build and install a CONST_DECL for one value of the
5939 current enumeration type (one that was begun with start_enum).
5940 Return a tree-list containing the CONST_DECL and its value.
5941 Assignment of sequential values by default is handled here. */
5944 build_enumerator (name, value)
5949 /* Validate and default VALUE. */
5951 /* Remove no-op casts from the value. */
5953 STRIP_TYPE_NOPS (value);
5957 if (TREE_CODE (value) == INTEGER_CST)
5959 value = default_conversion (value);
5960 constant_expression_warning (value);
5964 error ("enumerator value for `%s' not integer constant",
5965 IDENTIFIER_POINTER (name));
5970 /* Default based on previous value. */
5971 /* It should no longer be possible to have NON_LVALUE_EXPR
5975 value = enum_next_value;
5977 error ("overflow in enumeration values");
5980 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5982 pedwarn ("ISO C restricts enumerator values to range of `int'");
5983 value = convert (integer_type_node, value);
5986 /* Set basis for default for next value. */
5987 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5988 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5990 /* Now create a declaration for the enum value name. */
5992 type = TREE_TYPE (value);
5993 type = type_for_size (MAX (TYPE_PRECISION (type),
5994 TYPE_PRECISION (integer_type_node)),
5996 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
5997 && TREE_UNSIGNED (type)));
5999 decl = build_decl (CONST_DECL, name, type);
6000 DECL_INITIAL (decl) = convert (type, value);
6003 return tree_cons (decl, value, NULL_TREE);
6007 /* Create the FUNCTION_DECL for a function definition.
6008 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
6009 the declaration; they describe the function's name and the type it returns,
6010 but twisted together in a fashion that parallels the syntax of C.
6012 This function creates a binding context for the function body
6013 as well as setting up the FUNCTION_DECL in current_function_decl.
6015 Returns 1 on success. If the DECLARATOR is not suitable for a function
6016 (it defines a datum instead), we return 0, which tells
6017 yyparse to report a parse error. */
6020 start_function (declspecs, declarator, attributes)
6021 tree declarator, declspecs, attributes;
6023 tree decl1, old_decl;
6025 int old_immediate_size_expand = immediate_size_expand;
6027 current_function_returns_value = 0; /* Assume, until we see it does. */
6028 current_function_returns_null = 0;
6029 warn_about_return_type = 0;
6030 current_extern_inline = 0;
6031 c_function_varargs = 0;
6033 shadowed_labels = 0;
6035 /* Don't expand any sizes in the return type of the function. */
6036 immediate_size_expand = 0;
6038 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
6040 /* If the declarator is not suitable for a function definition,
6041 cause a syntax error. */
6044 immediate_size_expand = old_immediate_size_expand;
6048 decl_attributes (&decl1, attributes, 0);
6050 if (DECL_DECLARED_INLINE_P (decl1)
6051 && DECL_UNINLINABLE (decl1)
6052 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
6053 warning_with_decl (decl1,
6054 "inline function `%s' given attribute noinline");
6056 announce_function (decl1);
6058 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
6060 error ("return type is an incomplete type");
6061 /* Make it return void instead. */
6063 = build_function_type (void_type_node,
6064 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
6067 if (warn_about_return_type)
6068 pedwarn_c99 ("return type defaults to `int'");
6070 /* Save the parm names or decls from this function's declarator
6071 where store_parm_decls will find them. */
6072 current_function_parms = last_function_parms;
6073 current_function_parm_tags = last_function_parm_tags;
6075 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6076 error_mark_node is replaced below (in poplevel) with the BLOCK. */
6077 DECL_INITIAL (decl1) = error_mark_node;
6079 /* If this definition isn't a prototype and we had a prototype declaration
6080 before, copy the arg type info from that prototype.
6081 But not if what we had before was a builtin function. */
6082 old_decl = lookup_name_current_level (DECL_NAME (decl1));
6083 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
6084 && !DECL_BUILT_IN (old_decl)
6085 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6086 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
6087 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
6089 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
6090 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
6091 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
6094 /* If there is no explicit declaration, look for any out-of-scope implicit
6097 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
6099 /* Optionally warn of old-fashioned def with no previous prototype. */
6100 if (warn_strict_prototypes
6101 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6103 && (TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0
6104 || (DECL_BUILT_IN (old_decl)
6105 && ! C_DECL_ANTICIPATED (old_decl)))))
6106 warning ("function declaration isn't a prototype");
6107 /* Optionally warn of any global def with no previous prototype. */
6108 else if (warn_missing_prototypes
6109 && TREE_PUBLIC (decl1)
6111 && (TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0
6112 || (DECL_BUILT_IN (old_decl)
6113 && ! C_DECL_ANTICIPATED (old_decl))))
6114 && ! MAIN_NAME_P (DECL_NAME (decl1)))
6115 warning_with_decl (decl1, "no previous prototype for `%s'");
6116 /* Optionally warn of any def with no previous prototype
6117 if the function has already been used. */
6118 else if (warn_missing_prototypes
6119 && old_decl != 0 && TREE_USED (old_decl)
6120 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6121 warning_with_decl (decl1,
6122 "`%s' was used with no prototype before its definition");
6123 /* Optionally warn of any global def with no previous declaration. */
6124 else if (warn_missing_declarations
6125 && TREE_PUBLIC (decl1)
6127 && ! MAIN_NAME_P (DECL_NAME (decl1)))
6128 warning_with_decl (decl1, "no previous declaration for `%s'");
6129 /* Optionally warn of any def with no previous declaration
6130 if the function has already been used. */
6131 else if (warn_missing_declarations
6132 && old_decl != 0 && TREE_USED (old_decl)
6133 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
6134 warning_with_decl (decl1,
6135 "`%s' was used with no declaration before its definition");
6137 /* This is a definition, not a reference.
6138 So normally clear DECL_EXTERNAL.
6139 However, `extern inline' acts like a declaration
6140 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6141 DECL_EXTERNAL (decl1) = current_extern_inline;
6143 /* This function exists in static storage.
6144 (This does not mean `static' in the C sense!) */
6145 TREE_STATIC (decl1) = 1;
6147 /* A nested function is not global. */
6148 if (current_function_decl != 0)
6149 TREE_PUBLIC (decl1) = 0;
6151 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6152 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
6157 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6158 != integer_type_node)
6159 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
6161 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
6162 args = TREE_CHAIN (args))
6164 tree type = args ? TREE_VALUE (args) : 0;
6166 if (type == void_type_node)
6173 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6174 pedwarn_with_decl (decl1,
6175 "first argument of `%s' should be `int'");
6179 if (TREE_CODE (type) != POINTER_TYPE
6180 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6181 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6183 pedwarn_with_decl (decl1,
6184 "second argument of `%s' should be `char **'");
6188 if (TREE_CODE (type) != POINTER_TYPE
6189 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6190 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6192 pedwarn_with_decl (decl1,
6193 "third argument of `%s' should probably be `char **'");
6198 /* It is intentional that this message does not mention the third
6199 argument because it's only mentioned in an appendix of the
6201 if (argct > 0 && (argct < 2 || argct > 3))
6202 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
6204 if (! TREE_PUBLIC (decl1))
6205 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
6208 /* Record the decl so that the function name is defined.
6209 If we already have a decl for this name, and it is a FUNCTION_DECL,
6210 use the old decl. */
6212 current_function_decl = pushdecl (decl1);
6215 declare_parm_level (1);
6216 current_binding_level->subblocks_tag_transparent = 1;
6218 make_decl_rtl (current_function_decl, NULL);
6220 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6221 /* Promote the value to int before returning it. */
6222 if (c_promoting_integer_type_p (restype))
6224 /* It retains unsignedness if traditional
6225 or if not really getting wider. */
6226 if (TREE_UNSIGNED (restype)
6227 && (flag_traditional
6228 || (TYPE_PRECISION (restype)
6229 == TYPE_PRECISION (integer_type_node))))
6230 restype = unsigned_type_node;
6232 restype = integer_type_node;
6234 DECL_RESULT (current_function_decl)
6235 = build_decl (RESULT_DECL, NULL_TREE, restype);
6237 /* If this fcn was already referenced via a block-scope `extern' decl
6238 (or an implicit decl), propagate certain information about the usage. */
6239 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6240 TREE_ADDRESSABLE (current_function_decl) = 1;
6242 immediate_size_expand = old_immediate_size_expand;
6244 start_fname_decls ();
6249 /* Record that this function is going to be a varargs function.
6250 This is called before store_parm_decls, which is too early
6251 to call mark_varargs directly. */
6256 c_function_varargs = 1;
6259 /* Store the parameter declarations into the current function declaration.
6260 This is called after parsing the parameter declarations, before
6261 digesting the body of the function.
6263 For an old-style definition, modify the function's type
6264 to specify at least the number of arguments. */
6269 tree fndecl = current_function_decl;
6272 /* This is either a chain of PARM_DECLs (if a prototype was used)
6273 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6274 tree specparms = current_function_parms;
6276 /* This is a list of types declared among parms in a prototype. */
6277 tree parmtags = current_function_parm_tags;
6279 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6280 tree parmdecls = getdecls ();
6282 /* This is a chain of any other decls that came in among the parm
6283 declarations. If a parm is declared with enum {foo, bar} x;
6284 then CONST_DECLs for foo and bar are put here. */
6287 /* Nonzero if this definition is written with a prototype. */
6290 /* The function containing FNDECL, if any. */
6291 tree context = decl_function_context (fndecl);
6293 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6295 /* This case is when the function was defined with an ANSI prototype.
6296 The parms already have decls, so we need not do anything here
6297 except record them as in effect
6298 and complain if any redundant old-style parm decls were written. */
6309 error_with_decl (fndecl,
6310 "parm types given both in parmlist and separately");
6311 /* Get rid of the erroneous decls; don't keep them on
6312 the list of parms, since they might not be PARM_DECLs. */
6313 for (decl = current_binding_level->names;
6314 decl; decl = TREE_CHAIN (decl))
6315 if (DECL_NAME (decl))
6316 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6317 for (link = current_binding_level->shadowed;
6318 link; link = TREE_CHAIN (link))
6319 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6320 current_binding_level->names = 0;
6321 current_binding_level->shadowed = 0;
6324 specparms = nreverse (specparms);
6325 for (parm = specparms; parm; parm = next)
6327 next = TREE_CHAIN (parm);
6328 if (TREE_CODE (parm) == PARM_DECL)
6330 if (DECL_NAME (parm) == 0)
6331 error_with_decl (parm, "parameter name omitted");
6332 else if (TREE_CODE (TREE_TYPE (parm)) != ERROR_MARK
6333 && VOID_TYPE_P (TREE_TYPE (parm)))
6335 error_with_decl (parm, "parameter `%s' declared void");
6336 /* Change the type to error_mark_node so this parameter
6337 will be ignored by assign_parms. */
6338 TREE_TYPE (parm) = error_mark_node;
6344 /* If we find an enum constant or a type tag,
6345 put it aside for the moment. */
6346 TREE_CHAIN (parm) = 0;
6347 others = chainon (others, parm);
6351 /* Get the decls in their original chain order
6352 and record in the function. */
6353 DECL_ARGUMENTS (fndecl) = getdecls ();
6356 /* If this function takes a variable number of arguments,
6357 add a phony parameter to the end of the parm list,
6358 to represent the position of the first unnamed argument. */
6359 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6362 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6363 /* Let's hope the address of the unnamed parm
6364 won't depend on its type. */
6365 TREE_TYPE (dummy) = integer_type_node;
6366 DECL_ARG_TYPE (dummy) = integer_type_node;
6367 DECL_ARGUMENTS (fndecl) = chainon (DECL_ARGUMENTS (fndecl), dummy);
6371 /* Now pushdecl the enum constants. */
6372 for (parm = others; parm; parm = next)
6374 next = TREE_CHAIN (parm);
6375 if (DECL_NAME (parm) == 0)
6377 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6379 else if (TREE_CODE (parm) != PARM_DECL)
6383 storetags (chainon (parmtags, gettags ()));
6387 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6388 each with a parm name as the TREE_VALUE.
6390 PARMDECLS is a chain of declarations for parameters.
6391 Warning! It can also contain CONST_DECLs which are not parameters
6392 but are names of enumerators of any enum types
6393 declared among the parameters.
6395 First match each formal parameter name with its declaration.
6396 Associate decls with the names and store the decls
6397 into the TREE_PURPOSE slots. */
6399 /* We use DECL_WEAK as a flag to show which parameters have been
6400 seen already since it is not used on PARM_DECL or CONST_DECL. */
6401 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6402 DECL_WEAK (parm) = 0;
6404 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6406 tree tail, found = NULL;
6408 if (TREE_VALUE (parm) == 0)
6410 error_with_decl (fndecl,
6411 "parameter name missing from parameter list");
6412 TREE_PURPOSE (parm) = 0;
6416 /* See if any of the parmdecls specifies this parm by name.
6417 Ignore any enumerator decls. */
6418 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6419 if (DECL_NAME (tail) == TREE_VALUE (parm)
6420 && TREE_CODE (tail) == PARM_DECL)
6426 /* If declaration already marked, we have a duplicate name.
6427 Complain, and don't use this decl twice. */
6428 if (found && DECL_WEAK (found))
6430 error_with_decl (found, "multiple parameters named `%s'");
6434 /* If the declaration says "void", complain and ignore it. */
6435 if (found && VOID_TYPE_P (TREE_TYPE (found)))
6437 error_with_decl (found, "parameter `%s' declared void");
6438 TREE_TYPE (found) = integer_type_node;
6439 DECL_ARG_TYPE (found) = integer_type_node;
6440 layout_decl (found, 0);
6443 /* Traditionally, a parm declared float is actually a double. */
6444 if (found && flag_traditional
6445 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6447 TREE_TYPE (found) = double_type_node;
6448 DECL_ARG_TYPE (found) = double_type_node;
6449 layout_decl (found, 0);
6452 /* If no declaration found, default to int. */
6455 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6457 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6458 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6459 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6461 pedwarn_with_decl (found, "type of `%s' defaults to `int'");
6462 else if (extra_warnings)
6463 warning_with_decl (found, "type of `%s' defaults to `int'");
6467 TREE_PURPOSE (parm) = found;
6469 /* Mark this decl as "already found". */
6470 DECL_WEAK (found) = 1;
6473 /* Put anything which is on the parmdecls chain and which is
6474 not a PARM_DECL onto the list NONPARMS. (The types of
6475 non-parm things which might appear on the list include
6476 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6477 any actual PARM_DECLs not matched with any names. */
6480 for (parm = parmdecls; parm;)
6482 tree next = TREE_CHAIN (parm);
6483 TREE_CHAIN (parm) = 0;
6485 if (TREE_CODE (parm) != PARM_DECL)
6486 nonparms = chainon (nonparms, parm);
6489 /* Complain about args with incomplete types. */
6490 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6492 error_with_decl (parm, "parameter `%s' has incomplete type");
6493 TREE_TYPE (parm) = error_mark_node;
6496 if (! DECL_WEAK (parm))
6498 error_with_decl (parm,
6499 "declaration for parameter `%s' but no such parameter");
6500 /* Pretend the parameter was not missing.
6501 This gets us to a standard state and minimizes
6502 further error messages. */
6504 = chainon (specparms,
6505 tree_cons (parm, NULL_TREE, NULL_TREE));
6512 /* Chain the declarations together in the order of the list of
6513 names. Store that chain in the function decl, replacing the
6516 DECL_ARGUMENTS (fndecl) = 0;
6519 for (last = 0; parm; parm = TREE_CHAIN (parm))
6520 if (TREE_PURPOSE (parm))
6523 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6525 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6526 last = TREE_PURPOSE (parm);
6527 TREE_CHAIN (last) = 0;
6531 /* If there was a previous prototype,
6532 set the DECL_ARG_TYPE of each argument according to
6533 the type previously specified, and report any mismatches. */
6535 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6538 for (parm = DECL_ARGUMENTS (fndecl),
6539 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6540 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6541 != void_type_node));
6542 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6544 if (parm == 0 || type == 0
6545 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6547 error ("number of arguments doesn't match prototype");
6548 error_with_file_and_line (current_function_prototype_file,
6549 current_function_prototype_line,
6550 "prototype declaration");
6553 /* Type for passing arg must be consistent with that
6554 declared for the arg. ISO C says we take the unqualified
6555 type for parameters declared with qualified type. */
6556 if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6557 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
6559 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6560 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6562 /* Adjust argument to match prototype. E.g. a previous
6563 `int foo(float);' prototype causes
6564 `int foo(x) float x; {...}' to be treated like
6565 `int foo(float x) {...}'. This is particularly
6566 useful for argument types like uid_t. */
6567 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6569 if (PROMOTE_PROTOTYPES
6570 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6571 && TYPE_PRECISION (TREE_TYPE (parm))
6572 < TYPE_PRECISION (integer_type_node))
6573 DECL_ARG_TYPE (parm) = integer_type_node;
6577 pedwarn ("promoted argument `%s' doesn't match prototype",
6578 IDENTIFIER_POINTER (DECL_NAME (parm)));
6579 warning_with_file_and_line
6580 (current_function_prototype_file,
6581 current_function_prototype_line,
6582 "prototype declaration");
6585 /* If -traditional, allow `int' argument to match
6586 `unsigned' prototype. */
6587 else if (! (flag_traditional
6588 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6589 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6591 error ("argument `%s' doesn't match prototype",
6592 IDENTIFIER_POINTER (DECL_NAME (parm)));
6593 error_with_file_and_line (current_function_prototype_file,
6594 current_function_prototype_line,
6595 "prototype declaration");
6599 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6602 /* Otherwise, create a prototype that would match. */
6606 tree actual = 0, last = 0, type;
6608 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6610 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6612 TREE_CHAIN (last) = type;
6617 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6619 TREE_CHAIN (last) = type;
6623 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6624 of the type of this function, but we need to avoid having this
6625 affect the types of other similarly-typed functions, so we must
6626 first force the generation of an identical (but separate) type
6627 node for the relevant function type. The new node we create
6628 will be a variant of the main variant of the original function
6631 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6633 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6636 /* Now store the final chain of decls for the arguments
6637 as the decl-chain of the current lexical scope.
6638 Put the enumerators in as well, at the front so that
6639 DECL_ARGUMENTS is not modified. */
6641 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6644 /* Make sure the binding level for the top of the function body
6645 gets a BLOCK if there are any in the function.
6646 Otherwise, the dbx output is wrong. */
6648 keep_next_if_subblocks = 1;
6650 /* ??? This might be an improvement,
6651 but needs to be thought about some more. */
6653 keep_next_level_flag = 1;
6656 /* Write a record describing this function definition to the prototypes
6657 file (if requested). */
6659 gen_aux_info_record (fndecl, 1, 0, prototype);
6661 /* Initialize the RTL code for the function. */
6662 init_function_start (fndecl, input_filename, lineno);
6664 /* Begin the statement tree for this function. */
6665 begin_stmt_tree (&DECL_SAVED_TREE (current_function_decl));
6667 /* If this is a nested function, save away the sizes of any
6668 variable-size types so that we can expand them when generating
6674 DECL_LANG_SPECIFIC (fndecl)->pending_sizes
6675 = nreverse (get_pending_sizes ());
6676 for (t = DECL_LANG_SPECIFIC (fndecl)->pending_sizes;
6679 SAVE_EXPR_CONTEXT (TREE_VALUE (t)) = context;
6682 /* This function is being processed in whole-function mode. */
6683 cfun->x_whole_function_mode_p = 1;
6685 /* Even though we're inside a function body, we still don't want to
6686 call expand_expr to calculate the size of a variable-sized array.
6687 We haven't necessarily assigned RTL to all variables yet, so it's
6688 not safe to try to expand expressions involving them. */
6689 immediate_size_expand = 0;
6690 cfun->x_dont_save_pending_sizes_p = 1;
6693 /* Finish up a function declaration and compile that function
6694 all the way to assembler language output. The free the storage
6695 for the function definition.
6697 This is called after parsing the body of the function definition.
6699 NESTED is nonzero if the function being finished is nested in another. */
6702 finish_function (nested)
6705 tree fndecl = current_function_decl;
6707 /* TREE_READONLY (fndecl) = 1;
6708 This caused &foo to be of type ptr-to-const-function
6709 which then got a warning when stored in a ptr-to-function variable. */
6712 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6714 /* Must mark the RESULT_DECL as being in this function. */
6716 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6718 /* Obey `register' declarations if `setjmp' is called in this fn. */
6719 if (flag_traditional && current_function_calls_setjmp)
6721 setjmp_protect (DECL_INITIAL (fndecl));
6722 setjmp_protect_args ();
6725 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6727 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6728 != integer_type_node)
6730 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6731 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6733 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
6737 #ifdef DEFAULT_MAIN_RETURN
6738 /* Make it so that `main' always returns success by default. */
6739 DEFAULT_MAIN_RETURN;
6742 c_expand_return (integer_zero_node);
6747 finish_fname_decls ();
6749 /* Tie off the statement tree for this function. */
6750 finish_stmt_tree (&DECL_SAVED_TREE (fndecl));
6751 /* Clear out memory we no longer need. */
6752 free_after_parsing (cfun);
6753 /* Since we never call rest_of_compilation, we never clear
6754 CFUN. Do so explicitly. */
6755 free_after_compilation (cfun);
6760 /* Generate RTL for the body of this function. */
6761 c_expand_body (fndecl, nested, 1);
6762 /* Let the error reporting routines know that we're outside a
6763 function. For a nested function, this value is used in
6764 pop_c_function_context and then reset via pop_function_context. */
6765 current_function_decl = NULL;
6769 /* Generate the RTL for a deferred function FNDECL. */
6772 c_expand_deferred_function (fndecl)
6775 /* DECL_INLINE or DECL_RESULT might got cleared after the inline
6776 function was deferred, e.g. in duplicate_decls. */
6777 if (DECL_INLINE (fndecl) && DECL_RESULT (fndecl))
6779 c_expand_body (fndecl, 0, 0);
6780 current_function_decl = NULL;
6784 /* Generate the RTL for the body of FNDECL. If NESTED_P is non-zero,
6785 then we are already in the process of generating RTL for another
6786 function. If can_defer_p is zero, we won't attempt to defer the
6787 generation of RTL. */
6790 c_expand_body (fndecl, nested_p, can_defer_p)
6792 int nested_p, can_defer_p;
6794 int uninlinable = 1;
6796 /* There's no reason to do any of the work here if we're only doing
6797 semantic analysis; this code just generates RTL. */
6798 if (flag_syntax_only)
6801 if (flag_inline_trees)
6803 /* First, cache whether the current function is inlinable. Some
6804 predicates depend on cfun and current_function_decl to
6805 function completely. */
6806 timevar_push (TV_INTEGRATION);
6807 uninlinable = ! tree_inlinable_function_p (fndecl);
6809 if (! uninlinable && can_defer_p
6810 /* Save function tree for inlining. Should return 0 if the
6811 language does not support function deferring or the
6812 function could not be deferred. */
6813 && defer_fn (fndecl))
6815 /* Let the back-end know that this function exists. */
6816 (*debug_hooks->deferred_inline_function) (fndecl);
6817 timevar_pop (TV_INTEGRATION);
6821 /* Then, inline any functions called in it. */
6822 optimize_inline_calls (fndecl);
6823 timevar_pop (TV_INTEGRATION);
6826 timevar_push (TV_EXPAND);
6830 /* Make sure that we will evaluate variable-sized types involved
6831 in our function's type. */
6832 expand_pending_sizes (DECL_LANG_SPECIFIC (fndecl)->pending_sizes);
6833 /* Squirrel away our current state. */
6834 push_function_context ();
6837 /* Initialize the RTL code for the function. */
6838 current_function_decl = fndecl;
6839 init_function_start (fndecl, input_filename, DECL_SOURCE_LINE (fndecl));
6841 /* This function is being processed in whole-function mode. */
6842 cfun->x_whole_function_mode_p = 1;
6844 /* Even though we're inside a function body, we still don't want to
6845 call expand_expr to calculate the size of a variable-sized array.
6846 We haven't necessarily assigned RTL to all variables yet, so it's
6847 not safe to try to expand expressions involving them. */
6848 immediate_size_expand = 0;
6849 cfun->x_dont_save_pending_sizes_p = 1;
6851 /* If this is a varargs function, inform function.c. */
6852 if (c_function_varargs)
6855 /* Set up parameters and prepare for return, for the function. */
6856 expand_function_start (fndecl, 0);
6858 /* If this function is `main', emit a call to `__main'
6859 to run global initializers, etc. */
6860 if (DECL_NAME (fndecl)
6861 && MAIN_NAME_P (DECL_NAME (fndecl))
6862 && DECL_CONTEXT (fndecl) == NULL_TREE)
6863 expand_main_function ();
6865 /* Generate the RTL for this function. */
6866 expand_stmt (DECL_SAVED_TREE (fndecl));
6869 /* Allow the body of the function to be garbage collected. */
6870 DECL_SAVED_TREE (fndecl) = NULL_TREE;
6873 /* We hard-wired immediate_size_expand to zero above.
6874 expand_function_end will decrement this variable. So, we set the
6875 variable to one here, so that after the decrement it will remain
6877 immediate_size_expand = 1;
6879 /* Allow language dialects to perform special processing. */
6880 if (lang_expand_function_end)
6881 (*lang_expand_function_end) ();
6883 /* Generate rtl for function exit. */
6884 expand_function_end (input_filename, lineno, 0);
6886 /* If this is a nested function, protect the local variables in the stack
6887 above us from being collected while we're compiling this function. */
6889 ggc_push_context ();
6891 /* Run the optimizers and output the assembler code for this function. */
6892 rest_of_compilation (fndecl);
6894 /* Undo the GC context switch. */
6898 /* With just -W, complain only if function returns both with
6899 and without a value. */
6901 && current_function_returns_value
6902 && current_function_returns_null)
6903 warning ("this function may return with or without a value");
6905 /* If requested, warn about function definitions where the function will
6906 return a value (usually of some struct or union type) which itself will
6907 take up a lot of stack space. */
6909 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6911 tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6913 if (ret_type && TYPE_SIZE_UNIT (ret_type)
6914 && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST
6915 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type),
6918 unsigned int size_as_int
6919 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type));
6921 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0)
6922 warning_with_decl (fndecl,
6923 "size of return value of `%s' is %u bytes",
6926 warning_with_decl (fndecl,
6927 "size of return value of `%s' is larger than %d bytes",
6932 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested_p
6933 && ! flag_inline_trees)
6935 /* Stop pointing to the local nodes about to be freed.
6936 But DECL_INITIAL must remain nonzero so we know this
6937 was an actual function definition.
6938 For a nested function, this is done in pop_c_function_context.
6939 If rest_of_compilation set this to 0, leave it 0. */
6940 if (DECL_INITIAL (fndecl) != 0)
6941 DECL_INITIAL (fndecl) = error_mark_node;
6943 DECL_ARGUMENTS (fndecl) = 0;
6946 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6948 if (targetm.have_ctors_dtors)
6949 (* targetm.asm_out.constructor) (XEXP (DECL_RTL (fndecl), 0),
6950 DEFAULT_INIT_PRIORITY);
6952 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6955 if (DECL_STATIC_DESTRUCTOR (fndecl))
6957 if (targetm.have_ctors_dtors)
6958 (* targetm.asm_out.destructor) (XEXP (DECL_RTL (fndecl), 0),
6959 DEFAULT_INIT_PRIORITY);
6961 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6965 /* Return to the enclosing function. */
6966 pop_function_context ();
6967 timevar_pop (TV_EXPAND);
6970 /* Check the declarations given in a for-loop for satisfying the C99
6973 check_for_loop_decls ()
6979 /* If we get here, declarations have been used in a for loop without
6980 the C99 for loop scope. This doesn't make much sense, so don't
6982 error ("`for' loop initial declaration used outside C99 mode");
6985 /* C99 subclause 6.8.5 paragraph 3:
6987 [#3] The declaration part of a for statement shall only
6988 declare identifiers for objects having storage class auto or
6991 It isn't clear whether, in this sentence, "identifiers" binds to
6992 "shall only declare" or to "objects" - that is, whether all identifiers
6993 declared must be identifiers for objects, or whether the restriction
6994 only applies to those that are. (A question on this in comp.std.c
6995 in November 2000 received no answer.) We implement the strictest
6996 interpretation, to avoid creating an extension which later causes
6999 for (t = gettags (); t; t = TREE_CHAIN (t))
7001 if (TREE_PURPOSE (t) != 0)
7003 enum tree_code code = TREE_CODE (TREE_VALUE (t));
7005 if (code == RECORD_TYPE)
7006 error ("`struct %s' declared in `for' loop initial declaration",
7007 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
7008 else if (code == UNION_TYPE)
7009 error ("`union %s' declared in `for' loop initial declaration",
7010 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
7012 error ("`enum %s' declared in `for' loop initial declaration",
7013 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
7017 for (t = getdecls (); t; t = TREE_CHAIN (t))
7019 if (TREE_CODE (t) != VAR_DECL && DECL_NAME (t))
7020 error_with_decl (t, "declaration of non-variable `%s' in `for' loop initial declaration");
7021 else if (TREE_STATIC (t))
7022 error_with_decl (t, "declaration of static variable `%s' in `for' loop initial declaration");
7023 else if (DECL_EXTERNAL (t))
7024 error_with_decl (t, "declaration of `extern' variable `%s' in `for' loop initial declaration");
7028 /* Save and restore the variables in this file and elsewhere
7029 that keep track of the progress of compilation of the current function.
7030 Used for nested functions. */
7032 struct c_language_function
7034 struct language_function base;
7036 tree shadowed_labels;
7039 int warn_about_return_type;
7041 struct binding_level *binding_level;
7044 /* Save and reinitialize the variables
7045 used during compilation of a C function. */
7048 push_c_function_context (f)
7051 struct c_language_function *p;
7052 p = ((struct c_language_function *)
7053 xmalloc (sizeof (struct c_language_function)));
7054 f->language = (struct language_function *) p;
7056 p->base.x_stmt_tree = c_stmt_tree;
7057 p->base.x_scope_stmt_stack = c_scope_stmt_stack;
7058 p->named_labels = named_labels;
7059 p->shadowed_labels = shadowed_labels;
7060 p->returns_value = current_function_returns_value;
7061 p->returns_null = current_function_returns_null;
7062 p->warn_about_return_type = warn_about_return_type;
7063 p->extern_inline = current_extern_inline;
7064 p->binding_level = current_binding_level;
7067 /* Restore the variables used during compilation of a C function. */
7070 pop_c_function_context (f)
7073 struct c_language_function *p
7074 = (struct c_language_function *) f->language;
7077 /* Bring back all the labels that were shadowed. */
7078 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
7079 if (DECL_NAME (TREE_VALUE (link)) != 0)
7080 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
7081 = TREE_VALUE (link);
7083 if (DECL_SAVED_INSNS (current_function_decl) == 0
7084 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
7086 /* Stop pointing to the local nodes about to be freed. */
7087 /* But DECL_INITIAL must remain nonzero so we know this
7088 was an actual function definition. */
7089 DECL_INITIAL (current_function_decl) = error_mark_node;
7090 DECL_ARGUMENTS (current_function_decl) = 0;
7093 c_stmt_tree = p->base.x_stmt_tree;
7094 c_scope_stmt_stack = p->base.x_scope_stmt_stack;
7095 named_labels = p->named_labels;
7096 shadowed_labels = p->shadowed_labels;
7097 current_function_returns_value = p->returns_value;
7098 current_function_returns_null = p->returns_null;
7099 warn_about_return_type = p->warn_about_return_type;
7100 current_extern_inline = p->extern_inline;
7101 current_binding_level = p->binding_level;
7107 /* Mark the language specific parts of F for GC. */
7110 mark_c_function_context (f)
7113 struct c_language_function *p
7114 = (struct c_language_function *) f->language;
7119 mark_c_language_function (&p->base);
7120 ggc_mark_tree (p->shadowed_labels);
7121 ggc_mark_tree (p->named_labels);
7122 mark_binding_level (&p->binding_level);
7125 /* Copy the DECL_LANG_SPECIFIC data associated with NODE. */
7128 copy_lang_decl (decl)
7131 struct lang_decl *ld;
7133 if (!DECL_LANG_SPECIFIC (decl))
7136 ld = (struct lang_decl *) ggc_alloc (sizeof (struct lang_decl));
7137 memcpy ((char *) ld, (char *) DECL_LANG_SPECIFIC (decl),
7138 sizeof (struct lang_decl));
7139 DECL_LANG_SPECIFIC (decl) = ld;
7142 /* Mark the language specific bits in T for GC. */
7148 if (TREE_CODE (t) == IDENTIFIER_NODE)
7150 struct lang_identifier *i = (struct lang_identifier *) t;
7151 ggc_mark_tree (i->global_value);
7152 ggc_mark_tree (i->local_value);
7153 ggc_mark_tree (i->label_value);
7154 ggc_mark_tree (i->implicit_decl);
7155 ggc_mark_tree (i->error_locus);
7156 ggc_mark_tree (i->limbo_value);
7158 else if (TYPE_P (t) && TYPE_LANG_SPECIFIC (t))
7159 ggc_mark (TYPE_LANG_SPECIFIC (t));
7160 else if (DECL_P (t) && DECL_LANG_SPECIFIC (t))
7162 ggc_mark (DECL_LANG_SPECIFIC (t));
7163 c_mark_lang_decl (&DECL_LANG_SPECIFIC (t)->base);
7164 ggc_mark_tree (DECL_LANG_SPECIFIC (t)->pending_sizes);
7168 /* The functions below are required for functionality of doing
7169 function at once processing in the C front end. Currently these
7170 functions are not called from anywhere in the C front end, but as
7171 these changes continue, that will change. */
7173 /* Returns non-zero if the current statement is a full expression,
7174 i.e. temporaries created during that statement should be destroyed
7175 at the end of the statement. */
7178 stmts_are_full_exprs_p ()
7183 /* Returns the stmt_tree (if any) to which statements are currently
7184 being added. If there is no active statement-tree, NULL is
7188 current_stmt_tree ()
7190 return &c_stmt_tree;
7193 /* Returns the stack of SCOPE_STMTs for the current function. */
7196 current_scope_stmt_stack ()
7198 return &c_scope_stmt_stack;
7201 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
7205 anon_aggr_type_p (node)
7206 tree node ATTRIBUTE_UNUSED;
7211 /* Dummy function in place of callback used by C++. */
7214 extract_interface_info ()
7218 /* Return a new COMPOUND_STMT, after adding it to the current
7222 c_begin_compound_stmt ()
7226 /* Create the COMPOUND_STMT. */
7227 stmt = add_stmt (build_stmt (COMPOUND_STMT, NULL_TREE));
7232 /* Expand T (a DECL_STMT) if it declares an entity not handled by the
7236 c_expand_decl_stmt (t)
7239 tree decl = DECL_STMT_DECL (t);
7241 /* Expand nested functions. */
7242 if (TREE_CODE (decl) == FUNCTION_DECL
7243 && DECL_CONTEXT (decl) == current_function_decl
7244 && DECL_SAVED_TREE (decl))
7245 c_expand_body (decl, /*nested_p=*/1, /*can_defer_p=*/0);
7248 /* Return the IDENTIFIER_GLOBAL_VALUE of T, for use in common code, since
7249 the definition of IDENTIFIER_GLOBAL_VALUE is different for C and C++. */
7252 identifier_global_value (t)
7255 return IDENTIFIER_GLOBAL_VALUE (t);
7258 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
7259 otherwise the name is found in ridpointers from RID_INDEX. */
7262 record_builtin_type (rid_index, name, type)
7269 id = ridpointers[(int) rid_index];
7271 id = get_identifier (name);
7272 pushdecl (build_decl (TYPE_DECL, id, type));
7275 /* Build the void_list_node (void_type_node having been created). */
7277 build_void_list_node ()
7279 tree t = build_tree_list (NULL_TREE, void_type_node);