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 GNU CC.
7 GNU CC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU CC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
45 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
47 { NORMAL, /* Ordinary declaration */
48 FUNCDEF, /* Function definition */
49 PARM, /* Declaration of parm before function body */
50 FIELD, /* Declaration inside struct or union */
51 BITFIELD, /* Likewise but with specified width */
52 TYPENAME}; /* Typename (inside cast or sizeof) */
55 /* Nonzero if we have seen an invalid cross reference
56 to a struct, union, or enum, but not yet printed the message. */
58 tree pending_invalid_xref;
59 /* File and line to appear in the eventual error message. */
60 const char *pending_invalid_xref_file;
61 int pending_invalid_xref_line;
63 /* While defining an enum type, this is 1 plus the last enumerator
64 constant value. Note that will do not have to save this or `enum_overflow'
65 around nested function definition since such a definition could only
66 occur in an enum value expression and we don't use these variables in
69 static tree enum_next_value;
71 /* Nonzero means that there was overflow computing enum_next_value. */
73 static int enum_overflow;
75 /* Parsing a function declarator leaves a list of parameter names
76 or a chain or parameter decls here. */
78 static tree last_function_parms;
80 /* Parsing a function declarator leaves here a chain of structure
81 and enum types declared in the parmlist. */
83 static tree last_function_parm_tags;
85 /* After parsing the declarator that starts a function definition,
86 `start_function' puts here the list of parameter names or chain of decls.
87 `store_parm_decls' finds it here. */
89 static tree current_function_parms;
91 /* Similar, for last_function_parm_tags. */
92 static tree current_function_parm_tags;
94 /* Similar, for the file and line that the prototype came from if this is
95 an old-style definition. */
96 static const char *current_function_prototype_file;
97 static int current_function_prototype_line;
99 /* The current statement tree. */
101 static struct stmt_tree_s c_stmt_tree;
103 /* The current scope statement stack. */
105 static tree c_scope_stmt_stack;
107 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
108 that have names. Here so we can clear out their names' definitions
109 at the end of the function. */
111 static tree named_labels;
113 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
115 static tree shadowed_labels;
117 /* Nonzero when store_parm_decls is called indicates a varargs function.
118 Value not meaningful after store_parm_decls. */
120 static int c_function_varargs;
122 /* Set to 0 at beginning of a function definition, set to 1 if
123 a return statement that specifies a return value is seen. */
125 int current_function_returns_value;
127 /* Set to 0 at beginning of a function definition, set to 1 if
128 a return statement with no argument is seen. */
130 int current_function_returns_null;
132 /* Set to nonzero by `grokdeclarator' for a function
133 whose return type is defaulted, if warnings for this are desired. */
135 static int warn_about_return_type;
137 /* Nonzero when starting a function declared `extern inline'. */
139 static int current_extern_inline;
141 /* For each binding contour we allocate a binding_level structure
142 * which records the names defined in that contour.
145 * 1) one for each function definition,
146 * where internal declarations of the parameters appear.
147 * 2) one for each compound statement,
148 * to record its declarations.
150 * The current meaning of a name can be found by searching the levels from
151 * the current one out to the global one.
154 /* Note that the information in the `names' component of the global contour
155 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
159 /* A chain of _DECL nodes for all variables, constants, functions,
160 and typedef types. These are in the reverse of the order supplied.
164 /* A list of structure, union and enum definitions,
165 * for looking up tag names.
166 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
167 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
168 * or ENUMERAL_TYPE node.
172 /* For each level, a list of shadowed outer-level local definitions
173 to be restored when this level is popped.
174 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
175 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
178 /* For each level (except not the global one),
179 a chain of BLOCK nodes for all the levels
180 that were entered and exited one level down. */
183 /* The BLOCK node for this level, if one has been preallocated.
184 If 0, the BLOCK is allocated (if needed) when the level is popped. */
187 /* The binding level which this one is contained in (inherits from). */
188 struct binding_level *level_chain;
190 /* Nonzero for the level that holds the parameters of a function. */
193 /* Nonzero if this level "doesn't exist" for tags. */
194 char tag_transparent;
196 /* Nonzero if sublevels of this level "don't exist" for tags.
197 This is set in the parm level of a function definition
198 while reading the function body, so that the outermost block
199 of the function body will be tag-transparent. */
200 char subblocks_tag_transparent;
202 /* Nonzero means make a BLOCK for this level regardless of all else. */
205 /* Nonzero means make a BLOCK if this level has any subblocks. */
206 char keep_if_subblocks;
208 /* Number of decls in `names' that have incomplete
209 structure or union types. */
212 /* A list of decls giving the (reversed) specified order of parms,
213 not including any forward-decls in the parmlist.
214 This is so we can put the parms in proper order for assign_parms. */
218 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
220 /* The binding level currently in effect. */
222 static struct binding_level *current_binding_level;
224 /* A chain of binding_level structures awaiting reuse. */
226 static struct binding_level *free_binding_level;
228 /* The outermost binding level, for names of file scope.
229 This is created when the compiler is started and exists
230 through the entire run. */
232 static struct binding_level *global_binding_level;
234 /* Binding level structures are initialized by copying this one. */
236 static struct binding_level clear_binding_level
237 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, 0,
240 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
242 static int keep_next_level_flag;
244 /* Nonzero means make a BLOCK for the next level pushed
245 if it has subblocks. */
247 static int keep_next_if_subblocks;
249 /* The chain of outer levels of label scopes.
250 This uses the same data structure used for binding levels,
251 but it works differently: each link in the chain records
252 saved values of named_labels and shadowed_labels for
253 a label binding level outside the current one. */
255 static struct binding_level *label_level_chain;
257 /* Functions called automatically at the beginning and end of execution. */
259 tree static_ctors, static_dtors;
261 /* Forward declarations. */
263 static struct binding_level * make_binding_level PARAMS ((void));
264 static void mark_binding_level PARAMS ((void *));
265 static void clear_limbo_values PARAMS ((tree));
266 static int duplicate_decls PARAMS ((tree, tree, int));
267 static int redeclaration_error_message PARAMS ((tree, tree));
268 static void storedecls PARAMS ((tree));
269 static void storetags PARAMS ((tree));
270 static tree lookup_tag PARAMS ((enum tree_code, tree,
271 struct binding_level *, int));
272 static tree lookup_tag_reverse PARAMS ((tree));
273 static tree grokdeclarator PARAMS ((tree, tree, enum decl_context,
275 static tree grokparms PARAMS ((tree, int));
276 static void layout_array_type PARAMS ((tree));
277 static tree c_make_fname_decl PARAMS ((tree, int));
278 static void c_expand_body PARAMS ((tree, int));
280 /* C-specific option variables. */
282 /* Nonzero means allow type mismatches in conditional expressions;
283 just make their values `void'. */
285 int flag_cond_mismatch;
287 /* Nonzero means don't recognize the keyword `asm'. */
291 /* Nonzero means do some things the same way PCC does. */
293 int flag_traditional;
295 /* Nonzero means enable C89 Amendment 1 features. */
299 /* Nonzero means use the ISO C99 dialect of C. */
303 /* Nonzero means that we have builtin functions, and main is an int */
307 /* Nonzero means add default format_arg attributes for functions not
310 int flag_noniso_default_format_attributes = 1;
312 /* Nonzero means to allow single precision math even if we're generally
313 being traditional. */
314 int flag_allow_single_precision = 0;
316 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
318 int flag_signed_bitfields = 1;
319 int explicit_flag_signed_bitfields = 0;
321 /* Nonzero means warn about use of implicit int. */
323 int warn_implicit_int;
325 /* Nonzero means warn about usage of long long when `-pedantic'. */
327 int warn_long_long = 1;
329 /* Nonzero means message about use of implicit function declarations;
330 1 means warning; 2 means error. */
332 int mesg_implicit_function_declaration = -1;
334 /* Nonzero means give string constants the type `const char *'
335 to get extra warnings from them. These warnings will be too numerous
336 to be useful, except in thoroughly ANSIfied programs. */
338 int flag_const_strings;
340 /* Nonzero means warn about pointer casts that can drop a type qualifier
341 from the pointer target type. */
345 /* Nonzero means warn when casting a function call to a type that does
346 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
347 when there is no previous declaration of sqrt or malloc. */
349 int warn_bad_function_cast;
351 /* Warn about functions which might be candidates for format attributes. */
353 int warn_missing_format_attribute;
355 /* Warn about traditional constructs whose meanings changed in ANSI C. */
357 int warn_traditional;
359 /* Nonzero means warn about sizeof(function) or addition/subtraction
360 of function pointers. */
362 int warn_pointer_arith;
364 /* Nonzero means warn for non-prototype function decls
365 or non-prototyped defs without previous prototype. */
367 int warn_strict_prototypes;
369 /* Nonzero means warn for any global function def
370 without separate previous prototype decl. */
372 int warn_missing_prototypes;
374 /* Nonzero means warn for any global function def
375 without separate previous decl. */
377 int warn_missing_declarations;
379 /* Nonzero means warn about multiple (redundant) decls for the same single
380 variable or function. */
382 int warn_redundant_decls = 0;
384 /* Nonzero means warn about extern declarations of objects not at
385 file-scope level and about *all* declarations of functions (whether
386 extern or static) not at file-scope level. Note that we exclude
387 implicit function declarations. To get warnings about those, use
390 int warn_nested_externs = 0;
392 /* Warn about a subscript that has type char. */
394 int warn_char_subscripts = 0;
396 /* Warn if a type conversion is done that might have confusing results. */
400 /* Warn if adding () is suggested. */
402 int warn_parentheses;
404 /* Warn if initializer is not completely bracketed. */
406 int warn_missing_braces;
408 /* Warn if main is suspicious. */
412 /* Warn about #pragma directives that are not recognised. */
414 int warn_unknown_pragmas = 0; /* Tri state variable. */
416 /* Warn about comparison of signed and unsigned values.
417 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
419 int warn_sign_compare = -1;
421 /* Warn about testing equality of floating point numbers. */
423 int warn_float_equal = 0;
425 /* Nonzero means warn about use of multicharacter literals. */
427 int warn_multichar = 1;
429 /* The variant of the C language being processed. */
431 c_language_kind c_language = clk_c;
433 /* Nonzero means `$' can be in an identifier. */
435 #ifndef DOLLARS_IN_IDENTIFIERS
436 #define DOLLARS_IN_IDENTIFIERS 1
438 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
440 /* Decode the string P as a language-specific option for C.
441 Return the number of strings consumed. Should not complain
442 if it does not recognise the option. */
445 c_decode_option (argc, argv)
446 int argc ATTRIBUTE_UNUSED;
449 int strings_processed;
450 const char *option_value = NULL;
453 strings_processed = cpp_handle_option (parse_in, argc, argv);
455 if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
457 flag_traditional = 1;
458 flag_writable_strings = 1;
460 else if (!strcmp (p, "-fallow-single-precision"))
461 flag_allow_single_precision = 1;
462 else if (!strcmp (p, "-fhosted") || !strcmp (p, "-fno-freestanding"))
467 else if (!strcmp (p, "-ffreestanding") || !strcmp (p, "-fno-hosted"))
471 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
475 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
477 flag_traditional = 0;
478 flag_writable_strings = 0;
480 else if (!strncmp (p, "-std=", 5))
482 /* Select the appropriate language standard. We currently
484 -std=iso9899:1990 same as -ansi
485 -std=iso9899:199409 ISO C as modified in amend. 1
486 -std=iso9899:1999 ISO C 99
487 -std=c89 same as -std=iso9899:1990
488 -std=c99 same as -std=iso9899:1999
489 -std=gnu89 default, iso9899:1990 + gnu extensions
490 -std=gnu99 iso9899:1999 + gnu extensions
492 const char *argstart = &p[5];
494 if (!strcmp (argstart, "iso9899:1990")
495 || !strcmp (argstart, "c89"))
500 flag_traditional = 0;
501 flag_writable_strings = 0;
503 flag_no_nonansi_builtin = 1;
504 flag_noniso_default_format_attributes = 0;
507 else if (!strcmp (argstart, "iso9899:199409"))
512 else if (!strcmp (argstart, "iso9899:199x")
513 || !strcmp (argstart, "iso9899:1999")
514 || !strcmp (argstart, "c9x")
515 || !strcmp (argstart, "c99"))
517 flag_traditional = 0;
518 flag_writable_strings = 0;
520 flag_no_nonansi_builtin = 1;
521 flag_noniso_default_format_attributes = 0;
525 else if (!strcmp (argstart, "gnu89"))
527 flag_traditional = 0;
528 flag_writable_strings = 0;
530 flag_no_nonansi_builtin = 0;
531 flag_noniso_default_format_attributes = 1;
535 else if (!strcmp (argstart, "gnu9x") || !strcmp (argstart, "gnu99"))
537 flag_traditional = 0;
538 flag_writable_strings = 0;
540 flag_no_nonansi_builtin = 0;
541 flag_noniso_default_format_attributes = 1;
546 error ("unknown C standard `%s'", argstart);
548 else if (!strcmp (p, "-fdollars-in-identifiers"))
549 dollars_in_ident = 1;
550 else if (!strcmp (p, "-fno-dollars-in-identifiers"))
551 dollars_in_ident = 0;
552 else if (!strcmp (p, "-fsigned-char"))
553 flag_signed_char = 1;
554 else if (!strcmp (p, "-funsigned-char"))
555 flag_signed_char = 0;
556 else if (!strcmp (p, "-fno-signed-char"))
557 flag_signed_char = 0;
558 else if (!strcmp (p, "-fno-unsigned-char"))
559 flag_signed_char = 1;
560 else if (!strcmp (p, "-fsigned-bitfields")
561 || !strcmp (p, "-fno-unsigned-bitfields"))
563 flag_signed_bitfields = 1;
564 explicit_flag_signed_bitfields = 1;
566 else if (!strcmp (p, "-funsigned-bitfields")
567 || !strcmp (p, "-fno-signed-bitfields"))
569 flag_signed_bitfields = 0;
570 explicit_flag_signed_bitfields = 1;
572 else if (!strcmp (p, "-fshort-enums"))
573 flag_short_enums = 1;
574 else if (!strcmp (p, "-fno-short-enums"))
575 flag_short_enums = 0;
576 else if (!strcmp (p, "-fshort-wchar"))
577 flag_short_wchar = 1;
578 else if (!strcmp (p, "-fno-short-wchar"))
579 flag_short_wchar = 0;
580 else if (!strcmp (p, "-fcond-mismatch"))
581 flag_cond_mismatch = 1;
582 else if (!strcmp (p, "-fno-cond-mismatch"))
583 flag_cond_mismatch = 0;
584 else if (!strcmp (p, "-fshort-double"))
585 flag_short_double = 1;
586 else if (!strcmp (p, "-fno-short-double"))
587 flag_short_double = 0;
588 else if (!strcmp (p, "-fasm"))
590 else if (!strcmp (p, "-fno-asm"))
592 else if (!strcmp (p, "-fbuiltin"))
594 else if (!strcmp (p, "-fno-builtin"))
596 else if ((option_value
597 = skip_leading_substring (p, "-fdump-translation-unit-")))
600 error ("no file specified with -fdump-translation-unit");
602 flag_dump_translation_unit = option_value;
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, "-Wunknown-pragmas"))
757 /* Set to greater than 1, so that even unknown pragmas in system
758 headers will be warned about. */
759 warn_unknown_pragmas = 2;
760 else if (!strcmp (p, "-Wno-unknown-pragmas"))
761 warn_unknown_pragmas = 0;
762 else if (!strcmp (p, "-Wall"))
764 /* We save the value of warn_uninitialized, since if they put
765 -Wuninitialized on the command line, we need to generate a
766 warning about not using it without also specifying -O. */
767 if (warn_uninitialized != 1)
768 warn_uninitialized = 2;
769 warn_implicit_int = 1;
770 mesg_implicit_function_declaration = 1;
771 warn_return_type = 1;
775 warn_char_subscripts = 1;
776 warn_parentheses = 1;
777 warn_sequence_point = 1;
778 warn_missing_braces = 1;
779 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
780 it off only if it's not explicit. */
782 /* Only warn about unknown pragmas that are not in system headers. */
783 warn_unknown_pragmas = 1;
786 return strings_processed;
791 /* Hooks for print_node. */
794 print_lang_decl (file, node, indent)
795 FILE *file ATTRIBUTE_UNUSED;
796 tree node ATTRIBUTE_UNUSED;
797 int indent ATTRIBUTE_UNUSED;
802 print_lang_type (file, node, indent)
803 FILE *file ATTRIBUTE_UNUSED;
804 tree node ATTRIBUTE_UNUSED;
805 int indent ATTRIBUTE_UNUSED;
810 print_lang_identifier (file, node, indent)
815 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
816 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
817 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
818 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
819 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
820 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
821 if (C_IS_RESERVED_WORD (node))
823 tree rid = ridpointers[C_RID_CODE (node)];
824 indent_to (file, indent + 4);
825 fprintf (file, "rid ");
826 fprintf (file, HOST_PTR_PRINTF, (void *)rid);
827 fprintf (file, " \"%s\"", IDENTIFIER_POINTER (rid));
831 /* Hook called at end of compilation to assume 1 elt
832 for a top-level tentative array defn that wasn't complete before. */
835 finish_incomplete_decl (decl)
838 if (TREE_CODE (decl) == VAR_DECL)
840 tree type = TREE_TYPE (decl);
841 if (type != error_mark_node
842 && TREE_CODE (type) == ARRAY_TYPE
843 && ! DECL_EXTERNAL (decl)
844 && TYPE_DOMAIN (type) == 0)
846 warning_with_decl (decl, "array `%s' assumed to have one element");
848 complete_array_type (type, NULL_TREE, 1);
850 layout_decl (decl, 0);
855 /* Create a new `struct binding_level'. */
857 static struct binding_level *
858 make_binding_level ()
861 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
864 /* Nonzero if we are currently in the global binding level. */
869 return current_binding_level == global_binding_level;
875 keep_next_level_flag = 1;
878 /* Nonzero if the current level needs to have a BLOCK made. */
883 return ((current_binding_level->keep_if_subblocks
884 && current_binding_level->blocks != 0)
885 || current_binding_level->keep
886 || current_binding_level->names != 0
887 || (current_binding_level->tags != 0
888 && !current_binding_level->tag_transparent));
891 /* Identify this binding level as a level of parameters.
892 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
893 But it turns out there is no way to pass the right value for
894 DEFINITION_FLAG, so we ignore it. */
897 declare_parm_level (definition_flag)
898 int definition_flag ATTRIBUTE_UNUSED;
900 current_binding_level->parm_flag = 1;
903 /* Nonzero if currently making parm declarations. */
908 return current_binding_level->parm_flag;
911 /* Enter a new binding level.
912 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
913 not for that of tags. */
916 pushlevel (tag_transparent)
919 register struct binding_level *newlevel = NULL_BINDING_LEVEL;
921 /* If this is the top level of a function,
922 just make sure that NAMED_LABELS is 0. */
924 if (current_binding_level == global_binding_level)
929 /* Reuse or create a struct for this binding level. */
931 if (free_binding_level)
933 newlevel = free_binding_level;
934 free_binding_level = free_binding_level->level_chain;
938 newlevel = make_binding_level ();
941 /* Add this level to the front of the chain (stack) of levels that
944 *newlevel = clear_binding_level;
945 newlevel->tag_transparent
947 || (current_binding_level
948 ? current_binding_level->subblocks_tag_transparent
950 newlevel->level_chain = current_binding_level;
951 current_binding_level = newlevel;
952 newlevel->keep = keep_next_level_flag;
953 keep_next_level_flag = 0;
954 newlevel->keep_if_subblocks = keep_next_if_subblocks;
955 keep_next_if_subblocks = 0;
958 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
961 clear_limbo_values (block)
966 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
967 if (DECL_NAME (tem) != 0)
968 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
970 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
971 clear_limbo_values (tem);
974 /* Exit a binding level.
975 Pop the level off, and restore the state of the identifier-decl mappings
976 that were in effect when this level was entered.
978 If KEEP is nonzero, this level had explicit declarations, so
979 and create a "block" (a BLOCK node) for the level
980 to record its declarations and subblocks for symbol table output.
982 If FUNCTIONBODY is nonzero, this level is the body of a function,
983 so create a block as if KEEP were set and also clear out all
986 If REVERSE is nonzero, reverse the order of decls before putting
987 them into the BLOCK. */
990 poplevel (keep, reverse, functionbody)
996 /* The chain of decls was accumulated in reverse order.
997 Put it into forward order, just for cleanliness. */
999 tree tags = current_binding_level->tags;
1000 tree subblocks = current_binding_level->blocks;
1003 int block_previously_created;
1005 keep |= current_binding_level->keep;
1007 /* This warning is turned off because it causes warnings for
1008 declarations like `extern struct foo *x'. */
1010 /* Warn about incomplete structure types in this level. */
1011 for (link = tags; link; link = TREE_CHAIN (link))
1012 if (!COMPLETE_TYPE_P (TREE_VALUE (link)))
1014 tree type = TREE_VALUE (link);
1015 tree type_name = TYPE_NAME (type);
1016 char *id = IDENTIFIER_POINTER (TREE_CODE (type_name) == IDENTIFIER_NODE
1018 : DECL_NAME (type_name));
1019 switch (TREE_CODE (type))
1022 error ("`struct %s' incomplete in scope ending here", id);
1025 error ("`union %s' incomplete in scope ending here", id);
1028 error ("`enum %s' incomplete in scope ending here", id);
1034 /* Get the decls in the order they were written.
1035 Usually current_binding_level->names is in reverse order.
1036 But parameter decls were previously put in forward order. */
1039 current_binding_level->names
1040 = decls = nreverse (current_binding_level->names);
1042 decls = current_binding_level->names;
1044 /* Output any nested inline functions within this block
1045 if they weren't already output. */
1047 for (decl = decls; decl; decl = TREE_CHAIN (decl))
1048 if (TREE_CODE (decl) == FUNCTION_DECL
1049 && ! TREE_ASM_WRITTEN (decl)
1050 && DECL_INITIAL (decl) != 0
1051 && TREE_ADDRESSABLE (decl))
1053 /* If this decl was copied from a file-scope decl
1054 on account of a block-scope extern decl,
1055 propagate TREE_ADDRESSABLE to the file-scope decl.
1057 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1058 true, since then the decl goes through save_for_inline_copying. */
1059 if (DECL_ABSTRACT_ORIGIN (decl) != 0
1060 && DECL_ABSTRACT_ORIGIN (decl) != decl)
1061 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
1064 /* We used to warn about unused variables in expand_end_bindings,
1065 i.e. while generating RTL. But in function-at-a-time mode we may
1066 choose to never expand a function at all (e.g. auto inlining), so
1067 we do this explicitly now. */
1068 warn_about_unused_variables (getdecls ());
1070 /* If there were any declarations or structure tags in that level,
1071 or if this level is a function body,
1072 create a BLOCK to record them for the life of this function. */
1075 block_previously_created = (current_binding_level->this_block != 0);
1076 if (block_previously_created)
1077 block = current_binding_level->this_block;
1078 else if (keep || functionbody
1079 || (current_binding_level->keep_if_subblocks && subblocks != 0))
1080 block = make_node (BLOCK);
1083 BLOCK_VARS (block) = decls;
1084 BLOCK_SUBBLOCKS (block) = subblocks;
1087 /* In each subblock, record that this is its superior. */
1089 for (link = subblocks; link; link = TREE_CHAIN (link))
1090 BLOCK_SUPERCONTEXT (link) = block;
1092 /* Clear out the meanings of the local variables of this level. */
1094 for (link = decls; link; link = TREE_CHAIN (link))
1096 if (DECL_NAME (link) != 0)
1098 /* If the ident. was used or addressed via a local extern decl,
1099 don't forget that fact. */
1100 if (DECL_EXTERNAL (link))
1102 if (TREE_USED (link))
1103 TREE_USED (DECL_NAME (link)) = 1;
1104 if (TREE_ADDRESSABLE (link))
1105 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1107 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1111 /* Restore all name-meanings of the outer levels
1112 that were shadowed by this level. */
1114 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1115 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1117 /* If the level being exited is the top level of a function,
1118 check over all the labels, and clear out the current
1119 (function local) meanings of their names. */
1123 clear_limbo_values (block);
1125 /* If this is the top level block of a function,
1126 the vars are the function's parameters.
1127 Don't leave them in the BLOCK because they are
1128 found in the FUNCTION_DECL instead. */
1130 BLOCK_VARS (block) = 0;
1132 /* Clear out the definitions of all label names,
1133 since their scopes end here,
1134 and add them to BLOCK_VARS. */
1136 for (link = named_labels; link; link = TREE_CHAIN (link))
1138 register tree label = TREE_VALUE (link);
1140 if (DECL_INITIAL (label) == 0)
1142 error_with_decl (label, "label `%s' used but not defined");
1143 /* Avoid crashing later. */
1144 define_label (input_filename, lineno,
1147 else if (warn_unused_label && !TREE_USED (label))
1148 warning_with_decl (label, "label `%s' defined but not used");
1149 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1151 /* Put the labels into the "variables" of the
1152 top-level block, so debugger can see them. */
1153 TREE_CHAIN (label) = BLOCK_VARS (block);
1154 BLOCK_VARS (block) = label;
1158 /* Pop the current level, and free the structure for reuse. */
1161 register struct binding_level *level = current_binding_level;
1162 current_binding_level = current_binding_level->level_chain;
1164 level->level_chain = free_binding_level;
1165 free_binding_level = level;
1168 /* Dispose of the block that we just made inside some higher level. */
1170 DECL_INITIAL (current_function_decl) = block;
1173 if (!block_previously_created)
1174 current_binding_level->blocks
1175 = chainon (current_binding_level->blocks, block);
1177 /* If we did not make a block for the level just exited,
1178 any blocks made for inner levels
1179 (since they cannot be recorded as subblocks in that level)
1180 must be carried forward so they will later become subblocks
1181 of something else. */
1183 current_binding_level->blocks
1184 = chainon (current_binding_level->blocks, subblocks);
1186 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1187 binding contour so that they point to the appropriate construct, i.e.
1188 either to the current FUNCTION_DECL node, or else to the BLOCK node
1189 we just constructed.
1191 Note that for tagged types whose scope is just the formal parameter
1192 list for some function type specification, we can't properly set
1193 their TYPE_CONTEXTs here, because we don't have a pointer to the
1194 appropriate FUNCTION_TYPE node readily available to us. For those
1195 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1196 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1197 node which will represent the "scope" for these "parameter list local"
1201 for (link = tags; link; link = TREE_CHAIN (link))
1202 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1204 for (link = tags; link; link = TREE_CHAIN (link))
1205 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1208 TREE_USED (block) = 1;
1213 /* Delete the node BLOCK from the current binding level.
1214 This is used for the block inside a stmt expr ({...})
1215 so that the block can be reinserted where appropriate. */
1218 delete_block (block)
1222 if (current_binding_level->blocks == block)
1223 current_binding_level->blocks = TREE_CHAIN (block);
1224 for (t = current_binding_level->blocks; t;)
1226 if (TREE_CHAIN (t) == block)
1227 TREE_CHAIN (t) = TREE_CHAIN (block);
1231 TREE_CHAIN (block) = NULL;
1232 /* Clear TREE_USED which is always set by poplevel.
1233 The flag is set again if insert_block is called. */
1234 TREE_USED (block) = 0;
1237 /* Insert BLOCK at the end of the list of subblocks of the
1238 current binding level. This is used when a BIND_EXPR is expanded,
1239 to handle the BLOCK node inside the BIND_EXPR. */
1242 insert_block (block)
1245 TREE_USED (block) = 1;
1246 current_binding_level->blocks
1247 = chainon (current_binding_level->blocks, block);
1250 /* Set the BLOCK node for the innermost scope
1251 (the one we are currently in). */
1255 register tree block;
1257 current_binding_level->this_block = block;
1258 current_binding_level->names = chainon (current_binding_level->names,
1259 BLOCK_VARS (block));
1260 current_binding_level->blocks = chainon (current_binding_level->blocks,
1261 BLOCK_SUBBLOCKS (block));
1267 register struct binding_level *newlevel;
1269 /* Reuse or create a struct for this binding level. */
1271 if (free_binding_level)
1273 newlevel = free_binding_level;
1274 free_binding_level = free_binding_level->level_chain;
1278 newlevel = make_binding_level ();
1281 /* Add this level to the front of the chain (stack) of label levels. */
1283 newlevel->level_chain = label_level_chain;
1284 label_level_chain = newlevel;
1286 newlevel->names = named_labels;
1287 newlevel->shadowed = shadowed_labels;
1289 shadowed_labels = 0;
1295 register struct binding_level *level = label_level_chain;
1298 /* Clear out the definitions of the declared labels in this level.
1299 Leave in the list any ordinary, non-declared labels. */
1300 for (link = named_labels, prev = 0; link;)
1302 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1304 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1306 error_with_decl (TREE_VALUE (link),
1307 "label `%s' used but not defined");
1308 /* Avoid crashing later. */
1309 define_label (input_filename, lineno,
1310 DECL_NAME (TREE_VALUE (link)));
1312 else if (warn_unused_label && !TREE_USED (TREE_VALUE (link)))
1313 warning_with_decl (TREE_VALUE (link),
1314 "label `%s' defined but not used");
1315 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1317 /* Delete this element from the list. */
1318 link = TREE_CHAIN (link);
1320 TREE_CHAIN (prev) = link;
1322 named_labels = link;
1327 link = TREE_CHAIN (link);
1331 /* Bring back all the labels that were shadowed. */
1332 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1333 if (DECL_NAME (TREE_VALUE (link)) != 0)
1334 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1335 = TREE_VALUE (link);
1337 named_labels = chainon (named_labels, level->names);
1338 shadowed_labels = level->shadowed;
1340 /* Pop the current level, and free the structure for reuse. */
1341 label_level_chain = label_level_chain->level_chain;
1342 level->level_chain = free_binding_level;
1343 free_binding_level = level;
1346 /* Push a definition or a declaration of struct, union or enum tag "name".
1347 "type" should be the type node.
1348 We assume that the tag "name" is not already defined.
1350 Note that the definition may really be just a forward reference.
1351 In that case, the TYPE_SIZE will be zero. */
1354 pushtag (name, type)
1357 register struct binding_level *b;
1359 /* Find the proper binding level for this type tag. */
1361 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1366 /* Record the identifier as the type's name if it has none. */
1368 if (TYPE_NAME (type) == 0)
1369 TYPE_NAME (type) = name;
1372 b->tags = tree_cons (name, type, b->tags);
1374 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1375 tagged type we just added to the current binding level. This fake
1376 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1377 to output a representation of a tagged type, and it also gives
1378 us a convenient place to record the "scope start" address for the
1381 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1383 /* An approximation for now, so we can tell this is a function-scope tag.
1384 This will be updated in poplevel. */
1385 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1388 /* Handle when a new declaration NEWDECL
1389 has the same name as an old one OLDDECL
1390 in the same binding contour.
1391 Prints an error message if appropriate.
1393 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1394 Otherwise, return 0.
1396 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1397 and OLDDECL is in an outer binding level and should thus not be changed. */
1400 duplicate_decls (newdecl, olddecl, different_binding_level)
1401 register tree newdecl, olddecl;
1402 int different_binding_level;
1404 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1405 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1406 && DECL_INITIAL (newdecl) != 0);
1407 tree oldtype = TREE_TYPE (olddecl);
1408 tree newtype = TREE_TYPE (newdecl);
1411 if (DECL_P (olddecl))
1412 DECL_MACHINE_ATTRIBUTES (newdecl)
1413 = merge_machine_decl_attributes (olddecl, newdecl);
1415 if (TREE_CODE (newtype) == ERROR_MARK
1416 || TREE_CODE (oldtype) == ERROR_MARK)
1419 /* New decl is completely inconsistent with the old one =>
1420 tell caller to replace the old one.
1421 This is always an error except in the case of shadowing a builtin. */
1422 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1424 if (TREE_CODE (olddecl) == FUNCTION_DECL
1425 && (DECL_BUILT_IN (olddecl)
1426 || DECL_BUILT_IN_NONANSI (olddecl)))
1428 /* If you declare a built-in or predefined function name as static,
1429 the old definition is overridden,
1430 but optionally warn this was a bad choice of name. */
1431 if (!TREE_PUBLIC (newdecl))
1435 else if (DECL_BUILT_IN (olddecl))
1436 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1438 warning_with_decl (newdecl, "shadowing library function `%s'");
1440 /* Likewise, if the built-in is not ansi, then programs can
1441 override it even globally without an error. */
1442 else if (! DECL_BUILT_IN (olddecl))
1443 warning_with_decl (newdecl,
1444 "library function `%s' declared as non-function");
1446 else if (DECL_BUILT_IN_NONANSI (olddecl))
1447 warning_with_decl (newdecl,
1448 "built-in function `%s' declared as non-function");
1450 warning_with_decl (newdecl,
1451 "built-in function `%s' declared as non-function");
1455 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1456 error_with_decl (olddecl, "previous declaration of `%s'");
1462 /* For real parm decl following a forward decl,
1463 return 1 so old decl will be reused. */
1464 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1465 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1468 /* The new declaration is the same kind of object as the old one.
1469 The declarations may partially match. Print warnings if they don't
1470 match enough. Ultimately, copy most of the information from the new
1471 decl to the old one, and keep using the old one. */
1473 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1474 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1475 && DECL_INITIAL (olddecl) == 0)
1476 /* If -traditional, avoid error for redeclaring fcn
1477 after implicit decl. */
1479 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1480 && DECL_BUILT_IN (olddecl))
1482 /* A function declaration for a built-in function. */
1483 if (!TREE_PUBLIC (newdecl))
1485 /* If you declare a built-in function name as static, the
1486 built-in definition is overridden,
1487 but optionally warn this was a bad choice of name. */
1489 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1490 /* Discard the old built-in function. */
1493 else if (!types_match)
1495 /* Accept the return type of the new declaration if same modes. */
1496 tree oldreturntype = TREE_TYPE (oldtype);
1497 tree newreturntype = TREE_TYPE (newtype);
1499 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1501 /* Function types may be shared, so we can't just modify
1502 the return type of olddecl's function type. */
1504 = build_function_type (newreturntype,
1505 TYPE_ARG_TYPES (oldtype));
1507 types_match = comptypes (newtype, trytype);
1511 /* Accept harmless mismatch in first argument type also.
1512 This is for the ffs and fprintf builtins. */
1513 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1514 && TYPE_ARG_TYPES (oldtype) != 0
1515 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1516 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1517 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1518 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1520 /* Function types may be shared, so we can't just modify
1521 the return type of olddecl's function type. */
1523 = build_function_type (TREE_TYPE (oldtype),
1524 tree_cons (NULL_TREE,
1525 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1526 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1528 types_match = comptypes (newtype, trytype);
1532 if (! different_binding_level)
1533 TREE_TYPE (olddecl) = oldtype;
1537 /* If types don't match for a built-in, throw away the built-in. */
1538 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1542 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1543 && DECL_SOURCE_LINE (olddecl) == 0)
1545 /* A function declaration for a predeclared function
1546 that isn't actually built in. */
1547 if (!TREE_PUBLIC (newdecl))
1549 /* If you declare it as static, the
1550 default definition is overridden. */
1553 else if (!types_match)
1555 /* If the types don't match, preserve volatility indication.
1556 Later on, we will discard everything else about the
1557 default declaration. */
1558 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1561 /* Permit char *foo () to match void *foo (...) if not pedantic,
1562 if one of them came from a system header file. */
1563 else if (!types_match
1564 && TREE_CODE (olddecl) == FUNCTION_DECL
1565 && TREE_CODE (newdecl) == FUNCTION_DECL
1566 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1567 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1568 && (DECL_IN_SYSTEM_HEADER (olddecl)
1569 || DECL_IN_SYSTEM_HEADER (newdecl))
1570 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1571 && TYPE_ARG_TYPES (oldtype) == 0
1572 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1573 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1575 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1576 && TYPE_ARG_TYPES (newtype) == 0
1577 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1578 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1581 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1582 /* Make sure we keep void * as ret type, not char *. */
1583 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1584 TREE_TYPE (newdecl) = newtype = oldtype;
1586 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1587 we will come back here again. */
1588 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1590 else if (!types_match
1591 /* Permit char *foo (int, ...); followed by char *foo ();
1593 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1595 /* Return types must still match. */
1596 && comptypes (TREE_TYPE (oldtype),
1597 TREE_TYPE (newtype))
1598 && TYPE_ARG_TYPES (newtype) == 0))
1600 error_with_decl (newdecl, "conflicting types for `%s'");
1601 /* Check for function type mismatch
1602 involving an empty arglist vs a nonempty one. */
1603 if (TREE_CODE (olddecl) == FUNCTION_DECL
1604 && comptypes (TREE_TYPE (oldtype),
1605 TREE_TYPE (newtype))
1606 && ((TYPE_ARG_TYPES (oldtype) == 0
1607 && DECL_INITIAL (olddecl) == 0)
1609 (TYPE_ARG_TYPES (newtype) == 0
1610 && DECL_INITIAL (newdecl) == 0)))
1612 /* Classify the problem further. */
1613 register tree t = TYPE_ARG_TYPES (oldtype);
1615 t = TYPE_ARG_TYPES (newtype);
1616 for (; t; t = TREE_CHAIN (t))
1618 register tree type = TREE_VALUE (t);
1620 if (TREE_CHAIN (t) == 0
1621 && TYPE_MAIN_VARIANT (type) != void_type_node)
1623 error ("A parameter list with an ellipsis can't match an empty parameter name list declaration.");
1627 if (simple_type_promotes_to (type) != NULL_TREE)
1629 error ("An argument type that has a default promotion can't match an empty parameter name list declaration.");
1634 error_with_decl (olddecl, "previous declaration of `%s'");
1638 errmsg = redeclaration_error_message (newdecl, olddecl);
1644 error_with_decl (newdecl, "redefinition of `%s'");
1647 error_with_decl (newdecl, "redeclaration of `%s'");
1650 error_with_decl (newdecl, "conflicting declarations of `%s'");
1656 error_with_decl (olddecl,
1657 ((DECL_INITIAL (olddecl)
1658 && current_binding_level == global_binding_level)
1659 ? "`%s' previously defined here"
1660 : "`%s' previously declared here"));
1662 else if (TREE_CODE (newdecl) == TYPE_DECL
1663 && (DECL_IN_SYSTEM_HEADER (olddecl)
1664 || DECL_IN_SYSTEM_HEADER (newdecl)))
1666 warning_with_decl (newdecl, "redefinition of `%s'");
1669 ((DECL_INITIAL (olddecl)
1670 && current_binding_level == global_binding_level)
1671 ? "`%s' previously defined here"
1672 : "`%s' previously declared here"));
1674 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1675 && DECL_INITIAL (olddecl) != 0
1676 && TYPE_ARG_TYPES (oldtype) == 0
1677 && TYPE_ARG_TYPES (newtype) != 0
1678 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1680 register tree type, parm;
1682 /* Prototype decl follows defn w/o prototype. */
1684 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1685 type = TYPE_ARG_TYPES (newtype),
1688 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1690 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1691 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1693 warning_with_decl (newdecl, "prototype for `%s' follows");
1694 warning_with_decl (olddecl, "non-prototype definition here");
1697 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1698 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1700 error_with_decl (newdecl,
1701 "prototype for `%s' follows and number of arguments doesn't match");
1702 error_with_decl (olddecl, "non-prototype definition here");
1706 /* Type for passing arg must be consistent
1707 with that declared for the arg. */
1708 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1709 /* If -traditional, allow `unsigned int' instead of `int'
1710 in the prototype. */
1711 && (! (flag_traditional
1712 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1713 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1715 error_with_decl (newdecl,
1716 "prototype for `%s' follows and argument %d doesn't match",
1718 error_with_decl (olddecl, "non-prototype definition here");
1724 /* Warn about mismatches in various flags. */
1727 /* Warn if function is now inline
1728 but was previously declared not inline and has been called. */
1729 if (TREE_CODE (olddecl) == FUNCTION_DECL
1730 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1731 && TREE_USED (olddecl))
1732 warning_with_decl (newdecl,
1733 "`%s' declared inline after being called");
1734 if (TREE_CODE (olddecl) == FUNCTION_DECL
1735 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1736 && DECL_INITIAL (olddecl) != 0)
1737 warning_with_decl (newdecl,
1738 "`%s' declared inline after its definition");
1740 /* If pedantic, warn when static declaration follows a non-static
1741 declaration. Otherwise, do so only for functions. */
1742 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1743 && TREE_PUBLIC (olddecl)
1744 && !TREE_PUBLIC (newdecl))
1745 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1747 /* If warn_traditional, warn when a non-static function
1748 declaration follows a static one. */
1749 if (warn_traditional && !in_system_header
1750 && TREE_CODE (olddecl) == FUNCTION_DECL
1751 && !TREE_PUBLIC (olddecl)
1752 && TREE_PUBLIC (newdecl))
1753 warning_with_decl (newdecl, "non-static declaration for `%s' follows static");
1755 /* Warn when const declaration follows a non-const
1756 declaration, but not for functions. */
1757 if (TREE_CODE (olddecl) != FUNCTION_DECL
1758 && !TREE_READONLY (olddecl)
1759 && TREE_READONLY (newdecl))
1760 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1761 /* These bits are logically part of the type, for variables.
1762 But not for functions
1763 (where qualifiers are not valid ANSI anyway). */
1764 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1765 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1766 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1767 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1771 /* Optionally warn about more than one declaration for the same name. */
1772 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1773 /* Don't warn about a function declaration
1774 followed by a definition. */
1775 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1776 && DECL_INITIAL (olddecl) == 0)
1777 /* Don't warn about extern decl followed by (tentative) definition. */
1778 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1780 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1781 warning_with_decl (olddecl, "previous declaration of `%s'");
1784 /* Copy all the DECL_... slots specified in the new decl
1785 except for any that we copy here from the old type.
1787 Past this point, we don't change OLDTYPE and NEWTYPE
1788 even if we change the types of NEWDECL and OLDDECL. */
1792 /* When copying info to olddecl, we store into write_olddecl
1793 instead. This allows us to avoid modifying olddecl when
1794 different_binding_level is true. */
1795 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1797 /* Merge the data types specified in the two decls. */
1798 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1800 if (different_binding_level)
1802 if (TYPE_ARG_TYPES (oldtype) != 0
1803 && TYPE_ARG_TYPES (newtype) == 0)
1804 TREE_TYPE (newdecl) = common_type (newtype, oldtype);
1807 = build_type_attribute_variant
1809 merge_attributes (TYPE_ATTRIBUTES (newtype),
1810 TYPE_ATTRIBUTES (oldtype)));
1814 = TREE_TYPE (olddecl)
1815 = common_type (newtype, oldtype);
1818 /* Lay the type out, unless already done. */
1819 if (oldtype != TREE_TYPE (newdecl))
1821 if (TREE_TYPE (newdecl) != error_mark_node)
1822 layout_type (TREE_TYPE (newdecl));
1823 if (TREE_CODE (newdecl) != FUNCTION_DECL
1824 && TREE_CODE (newdecl) != TYPE_DECL
1825 && TREE_CODE (newdecl) != CONST_DECL)
1826 layout_decl (newdecl, 0);
1830 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1831 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1832 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1833 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1834 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1835 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1837 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1838 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1842 /* Keep the old rtl since we can safely use it. */
1843 COPY_DECL_RTL (olddecl, newdecl);
1845 /* Merge the type qualifiers. */
1846 if (TREE_CODE (olddecl) == FUNCTION_DECL
1847 && DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1848 && ! TREE_THIS_VOLATILE (newdecl))
1849 TREE_THIS_VOLATILE (write_olddecl) = 0;
1851 if (TREE_READONLY (newdecl))
1852 TREE_READONLY (write_olddecl) = 1;
1854 if (TREE_THIS_VOLATILE (newdecl))
1856 TREE_THIS_VOLATILE (write_olddecl) = 1;
1857 if (TREE_CODE (newdecl) == VAR_DECL
1858 /* If an automatic variable is re-declared in the same
1859 function scope, but the old declaration was not
1860 volatile, make_var_volatile() would crash because the
1861 variable would have been assigned to a pseudo, not a
1862 MEM. Since this duplicate declaration is invalid
1863 anyway, we just skip the call. */
1865 make_var_volatile (newdecl);
1868 /* Keep source location of definition rather than declaration. */
1869 /* When called with different_binding_level set, keep the old
1870 information so that meaningful diagnostics can be given. */
1871 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1872 && ! different_binding_level)
1874 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1875 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1878 /* Merge the unused-warning information. */
1879 if (DECL_IN_SYSTEM_HEADER (olddecl))
1880 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1881 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1882 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1884 /* Merge the initialization information. */
1885 /* When called with different_binding_level set, don't copy over
1886 DECL_INITIAL, so that we don't accidentally change function
1887 declarations into function definitions. */
1888 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1889 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1891 /* Merge the section attribute.
1892 We want to issue an error if the sections conflict but that must be
1893 done later in decl_attributes since we are called before attributes
1895 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1896 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1898 /* Copy the assembler name.
1899 Currently, it can only be defined in the prototype. */
1900 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1902 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1904 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1905 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1907 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1908 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1909 DECL_NO_CHECK_MEMORY_USAGE (newdecl)
1910 |= DECL_NO_CHECK_MEMORY_USAGE (olddecl);
1911 DECL_NO_LIMIT_STACK (newdecl)
1912 |= DECL_NO_LIMIT_STACK (olddecl);
1915 /* If cannot merge, then use the new type and qualifiers,
1916 and don't preserve the old rtl. */
1917 else if (! different_binding_level)
1919 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1920 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1921 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1922 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1925 /* Merge the storage class information. */
1926 DECL_WEAK (newdecl) |= DECL_WEAK (olddecl);
1927 /* For functions, static overrides non-static. */
1928 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1930 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1931 /* This is since we don't automatically
1932 copy the attributes of NEWDECL into OLDDECL. */
1933 /* No need to worry about different_binding_level here because
1934 then TREE_PUBLIC (newdecl) was true. */
1935 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1936 /* If this clears `static', clear it in the identifier too. */
1937 if (! TREE_PUBLIC (olddecl))
1938 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1940 if (DECL_EXTERNAL (newdecl))
1942 if (! different_binding_level)
1944 /* Don't mess with these flags on local externs; they remain
1945 external even if there's a declaration at file scope which
1947 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1948 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1950 /* An extern decl does not override previous storage class. */
1951 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1952 if (! DECL_EXTERNAL (newdecl))
1953 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1957 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1958 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1961 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1963 /* If we're redefining a function previously defined as extern
1964 inline, make sure we emit debug info for the inline before we
1965 throw it away, in case it was inlined into a function that hasn't
1966 been written out yet. */
1967 if (new_is_definition && DECL_INITIAL (olddecl) && TREE_USED (olddecl))
1969 note_outlining_of_inline_function (olddecl);
1971 /* The new defn must not be inline. */
1972 DECL_INLINE (newdecl) = 0;
1973 DECL_UNINLINABLE (newdecl) = 1;
1977 /* If either decl says `inline', this fn is inline,
1978 unless its definition was passed already. */
1979 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
1980 DECL_INLINE (olddecl) = 1;
1982 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1985 if (DECL_BUILT_IN (olddecl))
1987 /* Get rid of any built-in function if new arg types don't match it
1988 or if we have a function definition. */
1989 if (! types_match || new_is_definition)
1991 if (! different_binding_level)
1993 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1994 DECL_BUILT_IN_CLASS (olddecl) = NOT_BUILT_IN;
1999 /* If redeclaring a builtin function, and not a definition,
2000 it stays built in. */
2001 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2002 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2005 /* Also preserve various other info from the definition. */
2006 else if (! new_is_definition)
2007 DECL_NUM_STMTS (newdecl) = DECL_NUM_STMTS (olddecl);
2008 if (! new_is_definition)
2010 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2011 /* When called with different_binding_level set, don't copy over
2012 DECL_INITIAL, so that we don't accidentally change function
2013 declarations into function definitions. */
2014 if (! different_binding_level)
2015 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2016 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
2017 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2018 if (DECL_INLINE (newdecl))
2019 DECL_ABSTRACT_ORIGIN (newdecl) = DECL_ABSTRACT_ORIGIN (olddecl);
2022 if (different_binding_level)
2025 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2026 But preserve OLDDECL's DECL_UID. */
2028 register unsigned olddecl_uid = DECL_UID (olddecl);
2030 memcpy ((char *) olddecl + sizeof (struct tree_common),
2031 (char *) newdecl + sizeof (struct tree_common),
2032 sizeof (struct tree_decl) - sizeof (struct tree_common));
2033 DECL_UID (olddecl) = olddecl_uid;
2036 /* NEWDECL contains the merged attribute lists.
2037 Update OLDDECL to be the same. */
2038 DECL_MACHINE_ATTRIBUTES (olddecl) = DECL_MACHINE_ATTRIBUTES (newdecl);
2043 /* Record a decl-node X as belonging to the current lexical scope.
2044 Check for errors (such as an incompatible declaration for the same
2045 name already seen in the same scope).
2047 Returns either X or an old decl for the same name.
2048 If an old decl is returned, it may have been smashed
2049 to agree with what X says. */
2056 register tree name = DECL_NAME (x);
2057 register struct binding_level *b = current_binding_level;
2059 DECL_CONTEXT (x) = current_function_decl;
2060 /* A local extern declaration for a function doesn't constitute nesting.
2061 A local auto declaration does, since it's a forward decl
2062 for a nested function coming later. */
2063 if ((TREE_CODE (x) == FUNCTION_DECL || TREE_CODE (x) == VAR_DECL)
2064 && DECL_INITIAL (x) == 0 && DECL_EXTERNAL (x))
2065 DECL_CONTEXT (x) = 0;
2067 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
2068 && x != IDENTIFIER_IMPLICIT_DECL (name)
2069 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
2070 && !DECL_IN_SYSTEM_HEADER (x))
2071 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
2077 int different_binding_level = 0;
2079 t = lookup_name_current_level (name);
2080 /* Don't type check externs here when -traditional. This is so that
2081 code with conflicting declarations inside blocks will get warnings
2082 not errors. X11 for instance depends on this. */
2083 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
2085 t = IDENTIFIER_GLOBAL_VALUE (name);
2086 /* Type decls at global scope don't conflict with externs declared
2087 inside lexical blocks. */
2088 if (t && TREE_CODE (t) == TYPE_DECL)
2090 different_binding_level = 1;
2092 if (t != 0 && t == error_mark_node)
2093 /* error_mark_node is 0 for a while during initialization! */
2096 error_with_decl (x, "`%s' used prior to declaration");
2101 file = DECL_SOURCE_FILE (t);
2102 line = DECL_SOURCE_LINE (t);
2105 /* If this decl is `static' and an implicit decl was seen previously,
2106 warn. But don't complain if -traditional,
2107 since traditional compilers don't complain. */
2108 if (! flag_traditional && TREE_PUBLIC (name)
2109 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2110 sets this for all functions. */
2111 && ! TREE_PUBLIC (x)
2112 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2113 /* We used to warn also for explicit extern followed by static,
2114 but sometimes you need to do it that way. */
2115 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2117 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2118 IDENTIFIER_POINTER (name));
2119 pedwarn_with_file_and_line
2120 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2121 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2122 "previous declaration of `%s'",
2123 IDENTIFIER_POINTER (name));
2124 TREE_THIS_VOLATILE (name) = 1;
2127 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2129 if (TREE_CODE (t) == PARM_DECL)
2131 /* Don't allow more than one "real" duplicate
2132 of a forward parm decl. */
2133 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2139 /* If we are processing a typedef statement, generate a whole new
2140 ..._TYPE node (which will be just an variant of the existing
2141 ..._TYPE node with identical properties) and then install the
2142 TYPE_DECL node generated to represent the typedef name as the
2143 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2145 The whole point here is to end up with a situation where each
2146 and every ..._TYPE node the compiler creates will be uniquely
2147 associated with AT MOST one node representing a typedef name.
2148 This way, even though the compiler substitutes corresponding
2149 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2150 early on, later parts of the compiler can always do the reverse
2151 translation and get back the corresponding typedef name. For
2154 typedef struct S MY_TYPE;
2157 Later parts of the compiler might only know that `object' was of
2158 type `struct S' if it were not for code just below. With this
2159 code however, later parts of the compiler see something like:
2161 struct S' == struct S
2162 typedef struct S' MY_TYPE;
2165 And they can then deduce (from the node for type struct S') that
2166 the original object declaration was:
2170 Being able to do this is important for proper support of protoize,
2171 and also for generating precise symbolic debugging information
2172 which takes full account of the programmer's (typedef) vocabulary.
2174 Obviously, we don't want to generate a duplicate ..._TYPE node if
2175 the TYPE_DECL node that we are now processing really represents a
2176 standard built-in type.
2178 Since all standard types are effectively declared at line zero
2179 in the source file, we can easily check to see if we are working
2180 on a standard type by checking the current value of lineno. */
2182 if (TREE_CODE (x) == TYPE_DECL)
2184 if (DECL_SOURCE_LINE (x) == 0)
2186 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2187 TYPE_NAME (TREE_TYPE (x)) = x;
2189 else if (TREE_TYPE (x) != error_mark_node
2190 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2192 tree tt = TREE_TYPE (x);
2193 DECL_ORIGINAL_TYPE (x) = tt;
2194 tt = build_type_copy (tt);
2196 TREE_USED (tt) = TREE_USED (x);
2201 /* Multiple external decls of the same identifier ought to match.
2202 Check against both global declarations (when traditional) and out of
2203 scope (limbo) block level declarations.
2205 We get warnings about inline functions where they are defined.
2206 Avoid duplicate warnings where they are used. */
2208 && ! (TREE_CODE (x) == FUNCTION_DECL && DECL_INLINE (x)))
2212 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2213 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2214 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2215 decl = IDENTIFIER_GLOBAL_VALUE (name);
2216 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2217 /* Decls in limbo are always extern, so no need to check that. */
2218 decl = IDENTIFIER_LIMBO_VALUE (name);
2222 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2223 /* If old decl is built-in, we already warned if we should. */
2224 && !DECL_BUILT_IN (decl))
2226 pedwarn_with_decl (x,
2227 "type mismatch with previous external decl");
2228 pedwarn_with_decl (decl, "previous external decl of `%s'");
2232 /* If a function has had an implicit declaration, and then is defined,
2233 make sure they are compatible. */
2235 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2236 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2237 && TREE_CODE (x) == FUNCTION_DECL
2238 && ! comptypes (TREE_TYPE (x),
2239 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2241 warning_with_decl (x, "type mismatch with previous implicit declaration");
2242 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2243 "previous implicit declaration of `%s'");
2246 /* In PCC-compatibility mode, extern decls of vars with no current decl
2247 take effect at top level no matter where they are. */
2248 if (flag_traditional && DECL_EXTERNAL (x)
2249 && lookup_name (name) == 0)
2251 tree type = TREE_TYPE (x);
2253 /* But don't do this if the type contains temporary nodes. */
2256 if (type == error_mark_node)
2258 if (TYPE_CONTEXT (type))
2260 warning_with_decl (x, "type of external `%s' is not global");
2261 /* By exiting the loop early, we leave TYPE nonzero,
2262 and thus prevent globalization of the decl. */
2265 else if (TREE_CODE (type) == FUNCTION_TYPE
2266 && TYPE_ARG_TYPES (type) != 0)
2267 /* The types might not be truly local,
2268 but the list of arg types certainly is temporary.
2269 Since prototypes are nontraditional,
2270 ok not to do the traditional thing. */
2272 type = TREE_TYPE (type);
2276 b = global_binding_level;
2279 /* This name is new in its binding level.
2280 Install the new declaration and return it. */
2281 if (b == global_binding_level)
2283 /* Install a global value. */
2285 /* If the first global decl has external linkage,
2286 warn if we later see static one. */
2287 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2288 TREE_PUBLIC (name) = 1;
2290 IDENTIFIER_GLOBAL_VALUE (name) = x;
2292 /* We no longer care about any previous block level declarations. */
2293 IDENTIFIER_LIMBO_VALUE (name) = 0;
2295 /* Don't forget if the function was used via an implicit decl. */
2296 if (IDENTIFIER_IMPLICIT_DECL (name)
2297 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2298 TREE_USED (x) = 1, TREE_USED (name) = 1;
2300 /* Don't forget if its address was taken in that way. */
2301 if (IDENTIFIER_IMPLICIT_DECL (name)
2302 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2303 TREE_ADDRESSABLE (x) = 1;
2305 /* Warn about mismatches against previous implicit decl. */
2306 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2307 /* If this real decl matches the implicit, don't complain. */
2308 && ! (TREE_CODE (x) == FUNCTION_DECL
2309 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2310 == integer_type_node)))
2311 pedwarn ("`%s' was previously implicitly declared to return `int'",
2312 IDENTIFIER_POINTER (name));
2314 /* If this decl is `static' and an `extern' was seen previously,
2315 that is erroneous. */
2316 if (TREE_PUBLIC (name)
2317 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2319 /* Okay to redeclare an ANSI built-in as static. */
2320 if (t != 0 && DECL_BUILT_IN (t))
2322 /* Okay to declare a non-ANSI built-in as anything. */
2323 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2325 /* Okay to have global type decl after an earlier extern
2326 declaration inside a lexical block. */
2327 else if (TREE_CODE (x) == TYPE_DECL)
2329 else if (IDENTIFIER_IMPLICIT_DECL (name))
2331 if (! TREE_THIS_VOLATILE (name))
2332 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2333 IDENTIFIER_POINTER (name));
2336 pedwarn ("`%s' was declared `extern' and later `static'",
2337 IDENTIFIER_POINTER (name));
2342 /* Here to install a non-global value. */
2343 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2344 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2346 IDENTIFIER_LOCAL_VALUE (name) = x;
2348 /* If this is an extern function declaration, see if we
2349 have a global definition or declaration for the function. */
2352 && TREE_CODE (x) == FUNCTION_DECL
2353 && TREE_CODE (oldglobal) == FUNCTION_DECL
2354 && DECL_EXTERNAL (x) && ! DECL_INLINE (x))
2356 /* We have one. Their types must agree. */
2357 if (! comptypes (TREE_TYPE (x),
2358 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2359 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2362 /* Inner extern decl is inline if global one is.
2363 Copy enough to really inline it. */
2364 if (DECL_INLINE (oldglobal))
2366 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2367 DECL_INITIAL (x) = (current_function_decl == oldglobal
2368 ? 0 : DECL_INITIAL (oldglobal));
2369 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2370 DECL_NUM_STMTS (x) = DECL_NUM_STMTS (oldglobal);
2371 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2372 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2373 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2374 DECL_ABSTRACT_ORIGIN (x)
2375 = DECL_ABSTRACT_ORIGIN (oldglobal);
2377 /* Inner extern decl is built-in if global one is. */
2378 if (DECL_BUILT_IN (oldglobal))
2380 DECL_BUILT_IN_CLASS (x) = DECL_BUILT_IN_CLASS (oldglobal);
2381 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2383 /* Keep the arg types from a file-scope fcn defn. */
2384 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2385 && DECL_INITIAL (oldglobal)
2386 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2387 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2392 /* This case is probably sometimes the right thing to do. */
2393 /* If we have a local external declaration,
2394 then any file-scope declaration should not
2395 have been static. */
2396 if (oldlocal == 0 && oldglobal != 0
2397 && !TREE_PUBLIC (oldglobal)
2398 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2399 warning ("`%s' locally external but globally static",
2400 IDENTIFIER_POINTER (name));
2403 /* If we have a local external declaration,
2404 and no file-scope declaration has yet been seen,
2405 then if we later have a file-scope decl it must not be static. */
2407 && DECL_EXTERNAL (x)
2411 TREE_PUBLIC (name) = 1;
2413 /* Save this decl, so that we can do type checking against
2414 other decls after it falls out of scope.
2416 Only save it once. This prevents temporary decls created in
2417 expand_inline_function from being used here, since this
2418 will have been set when the inline function was parsed.
2419 It also helps give slightly better warnings. */
2420 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2421 IDENTIFIER_LIMBO_VALUE (name) = x;
2424 /* Warn if shadowing an argument at the top level of the body. */
2425 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2426 /* This warning doesn't apply to the parms of a nested fcn. */
2427 && ! current_binding_level->parm_flag
2428 /* Check that this is one level down from the parms. */
2429 && current_binding_level->level_chain->parm_flag
2430 /* Check that the decl being shadowed
2431 comes from the parm level, one level up. */
2432 && chain_member (oldlocal, current_binding_level->level_chain->names))
2434 if (TREE_CODE (oldlocal) == PARM_DECL)
2435 pedwarn ("declaration of `%s' shadows a parameter",
2436 IDENTIFIER_POINTER (name));
2438 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2439 IDENTIFIER_POINTER (name));
2442 /* Maybe warn if shadowing something else. */
2443 else if (warn_shadow && !DECL_EXTERNAL (x)
2444 /* No shadow warnings for internally generated vars. */
2445 && DECL_SOURCE_LINE (x) != 0
2446 /* No shadow warnings for vars made for inlining. */
2447 && ! DECL_FROM_INLINE (x))
2449 const char *id = IDENTIFIER_POINTER (name);
2451 if (TREE_CODE (x) == PARM_DECL
2452 && current_binding_level->level_chain->parm_flag)
2453 /* Don't warn about the parm names in function declarator
2454 within a function declarator.
2455 It would be nice to avoid warning in any function
2456 declarator in a declaration, as opposed to a definition,
2457 but there is no way to tell it's not a definition. */
2459 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2460 warning ("declaration of `%s' shadows a parameter", id);
2461 else if (oldlocal != 0)
2462 warning ("declaration of `%s' shadows previous local", id);
2463 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2464 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2465 warning ("declaration of `%s' shadows global declaration", id);
2468 /* If storing a local value, there may already be one (inherited).
2469 If so, record it for restoration when this binding level ends. */
2471 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2474 /* Keep count of variables in this level with incomplete type.
2475 If the input is erroneous, we can have error_mark in the type
2476 slot (e.g. "f(void a, ...)") - that doesn't count as an
2478 if (TREE_TYPE (x) != error_mark_node
2479 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2483 /* Put decls on list in reverse order.
2484 We will reverse them later if necessary. */
2485 TREE_CHAIN (x) = b->names;
2491 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2494 pushdecl_top_level (x)
2498 register struct binding_level *b = current_binding_level;
2500 current_binding_level = global_binding_level;
2502 current_binding_level = b;
2506 /* Generate an implicit declaration for identifier FUNCTIONID
2507 as a function of type int (). Print a warning if appropriate. */
2510 implicitly_declare (functionid)
2514 int traditional_warning = 0;
2515 /* Only one "implicit declaration" warning per identifier. */
2516 int implicit_warning;
2518 /* We used to reuse an old implicit decl here,
2519 but this loses with inline functions because it can clobber
2520 the saved decl chains. */
2522 if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2523 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2526 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2528 /* Warn of implicit decl following explicit local extern decl.
2529 This is probably a program designed for traditional C. */
2530 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2531 traditional_warning = 1;
2533 /* Warn once of an implicit declaration. */
2534 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2536 DECL_EXTERNAL (decl) = 1;
2537 TREE_PUBLIC (decl) = 1;
2539 /* Record that we have an implicit decl and this is it. */
2540 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2542 /* ANSI standard says implicit declarations are in the innermost block.
2543 So we record the decl in the standard fashion.
2544 If flag_traditional is set, pushdecl does it top-level. */
2547 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2548 maybe_objc_check_decl (decl);
2550 rest_of_decl_compilation (decl, NULL, 0, 0);
2552 if (implicit_warning)
2553 implicit_decl_warning (functionid);
2554 else if (warn_traditional && traditional_warning)
2555 warning ("function `%s' was previously declared within a block",
2556 IDENTIFIER_POINTER (functionid));
2558 /* Write a record describing this implicit function declaration to the
2559 prototypes file (if requested). */
2561 gen_aux_info_record (decl, 0, 1, 0);
2567 implicit_decl_warning (id)
2570 const char *name = IDENTIFIER_POINTER (id);
2571 if (mesg_implicit_function_declaration == 2)
2572 error ("implicit declaration of function `%s'", name);
2573 else if (mesg_implicit_function_declaration == 1)
2574 warning ("implicit declaration of function `%s'", name);
2577 /* Return zero if the declaration NEWDECL is valid
2578 when the declaration OLDDECL (assumed to be for the same name)
2579 has already been seen.
2580 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
2581 and 3 if it is a conflicting declaration. */
2584 redeclaration_error_message (newdecl, olddecl)
2585 tree newdecl, olddecl;
2587 if (TREE_CODE (newdecl) == TYPE_DECL)
2589 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2591 /* pushdecl creates distinct types for TYPE_DECLs by calling
2592 build_type_copy, so the above comparison generally fails. We do
2593 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2594 is equivalent to what this code used to do before the build_type_copy
2595 call. The variant type distinction should not matter for traditional
2596 code, because it doesn't have type qualifiers. */
2597 if (flag_traditional
2598 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
2600 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2604 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2606 /* Declarations of functions can insist on internal linkage
2607 but they can't be inconsistent with internal linkage,
2608 so there can be no error on that account.
2609 However defining the same name twice is no good. */
2610 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2611 /* However, defining once as extern inline and a second
2612 time in another way is ok. */
2613 && ! (DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2614 && ! (DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2618 else if (DECL_CONTEXT (newdecl) == NULL_TREE)
2620 /* Objects declared at top level: */
2621 /* If at least one is a reference, it's ok. */
2622 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2624 /* Reject two definitions. */
2625 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2627 /* Now we have two tentative defs, or one tentative and one real def. */
2628 /* Insist that the linkage match. */
2629 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2633 else if (current_binding_level->parm_flag
2634 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2638 /* Newdecl has block scope. If olddecl has block scope also, then
2639 reject two definitions, and reject a definition together with an
2640 external reference. Otherwise, it is OK, because newdecl must
2641 be an extern reference to olddecl. */
2642 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2643 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2649 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2650 Create one if none exists so far for the current function.
2651 This function is called for both label definitions and label references. */
2657 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2659 if (current_function_decl == 0)
2661 error ("label %s referenced outside of any function",
2662 IDENTIFIER_POINTER (id));
2666 /* Use a label already defined or ref'd with this name. */
2669 /* But not if it is inherited and wasn't declared to be inheritable. */
2670 if (DECL_CONTEXT (decl) != current_function_decl
2671 && ! C_DECLARED_LABEL_FLAG (decl))
2672 return shadow_label (id);
2676 decl = build_decl (LABEL_DECL, id, void_type_node);
2678 /* A label not explicitly declared must be local to where it's ref'd. */
2679 DECL_CONTEXT (decl) = current_function_decl;
2681 DECL_MODE (decl) = VOIDmode;
2683 /* Say where one reference is to the label,
2684 for the sake of the error if it is not defined. */
2685 DECL_SOURCE_LINE (decl) = lineno;
2686 DECL_SOURCE_FILE (decl) = input_filename;
2688 IDENTIFIER_LABEL_VALUE (id) = decl;
2690 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2695 /* Make a label named NAME in the current function,
2696 shadowing silently any that may be inherited from containing functions
2697 or containing scopes.
2699 Note that valid use, if the label being shadowed
2700 comes from another scope in the same function,
2701 requires calling declare_nonlocal_label right away. */
2707 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2713 /* Check to make sure that the label hasn't already been declared
2714 at this label scope */
2715 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2716 if (TREE_VALUE (dup) == decl)
2718 error ("duplicate label declaration `%s'",
2719 IDENTIFIER_POINTER (name));
2720 error_with_decl (TREE_VALUE (dup),
2721 "this is a previous declaration");
2722 /* Just use the previous declaration. */
2723 return lookup_label (name);
2726 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2727 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2730 return lookup_label (name);
2733 /* Define a label, specifying the location in the source file.
2734 Return the LABEL_DECL node for the label, if the definition is valid.
2735 Otherwise return 0. */
2738 define_label (filename, line, name)
2739 const char *filename;
2743 tree decl = lookup_label (name);
2745 /* If label with this name is known from an outer context, shadow it. */
2746 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2748 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2749 IDENTIFIER_LABEL_VALUE (name) = 0;
2750 decl = lookup_label (name);
2753 if (warn_traditional && !in_system_header && lookup_name (name))
2754 warning_with_file_and_line (filename, line,
2755 "traditional C lacks a separate namespace for labels, identifier `%s' conflicts",
2756 IDENTIFIER_POINTER (name));
2758 if (DECL_INITIAL (decl) != 0)
2760 error_with_file_and_line (filename, line, "duplicate label `%s'",
2761 IDENTIFIER_POINTER (name));
2766 /* Mark label as having been defined. */
2767 DECL_INITIAL (decl) = error_mark_node;
2768 /* Say where in the source. */
2769 DECL_SOURCE_FILE (decl) = filename;
2770 DECL_SOURCE_LINE (decl) = line;
2775 /* Return the list of declarations of the current level.
2776 Note that this list is in reverse order unless/until
2777 you nreverse it; and when you do nreverse it, you must
2778 store the result back using `storedecls' or you will lose. */
2783 return current_binding_level->names;
2786 /* Return the list of type-tags (for structs, etc) of the current level. */
2791 return current_binding_level->tags;
2794 /* Store the list of declarations of the current level.
2795 This is done for the parameter declarations of a function being defined,
2796 after they are modified in the light of any missing parameters. */
2802 current_binding_level->names = decls;
2805 /* Similarly, store the list of tags of the current level. */
2811 current_binding_level->tags = tags;
2814 /* Given NAME, an IDENTIFIER_NODE,
2815 return the structure (or union or enum) definition for that name.
2816 Searches binding levels from BINDING_LEVEL up to the global level.
2817 If THISLEVEL_ONLY is nonzero, searches only the specified context
2818 (but skips any tag-transparent contexts to find one that is
2819 meaningful for tags).
2820 CODE says which kind of type the caller wants;
2821 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2822 If the wrong kind of type is found, an error is reported. */
2825 lookup_tag (code, name, binding_level, thislevel_only)
2826 enum tree_code code;
2827 struct binding_level *binding_level;
2831 register struct binding_level *level;
2834 for (level = binding_level; level; level = level->level_chain)
2837 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2839 if (TREE_PURPOSE (tail) == name)
2841 if (TREE_CODE (TREE_VALUE (tail)) != code)
2843 /* Definition isn't the kind we were looking for. */
2844 pending_invalid_xref = name;
2845 pending_invalid_xref_file = input_filename;
2846 pending_invalid_xref_line = lineno;
2847 /* If in the same binding level as a declaration as a tag
2848 of a different type, this must not be allowed to
2849 shadow that tag, so give the error immediately.
2850 (For example, "struct foo; union foo;" is invalid.) */
2852 pending_xref_error ();
2854 return TREE_VALUE (tail);
2857 if (! level->tag_transparent)
2867 /* Print an error message now
2868 for a recent invalid struct, union or enum cross reference.
2869 We don't print them immediately because they are not invalid
2870 when used in the `struct foo;' construct for shadowing. */
2873 pending_xref_error ()
2875 if (pending_invalid_xref != 0)
2876 error_with_file_and_line (pending_invalid_xref_file,
2877 pending_invalid_xref_line,
2878 "`%s' defined as wrong kind of tag",
2879 IDENTIFIER_POINTER (pending_invalid_xref));
2880 pending_invalid_xref = 0;
2883 /* Given a type, find the tag that was defined for it and return the tag name.
2884 Otherwise return 0. */
2887 lookup_tag_reverse (type)
2890 register struct binding_level *level;
2892 for (level = current_binding_level; level; level = level->level_chain)
2895 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2897 if (TREE_VALUE (tail) == type)
2898 return TREE_PURPOSE (tail);
2904 /* Look up NAME in the current binding level and its superiors
2905 in the namespace of variables, functions and typedefs.
2906 Return a ..._DECL node of some kind representing its definition,
2907 or return 0 if it is undefined. */
2915 if (current_binding_level != global_binding_level
2916 && IDENTIFIER_LOCAL_VALUE (name))
2917 val = IDENTIFIER_LOCAL_VALUE (name);
2919 val = IDENTIFIER_GLOBAL_VALUE (name);
2923 /* Similar to `lookup_name' but look only at current binding level. */
2926 lookup_name_current_level (name)
2931 if (current_binding_level == global_binding_level)
2932 return IDENTIFIER_GLOBAL_VALUE (name);
2934 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2937 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2938 if (DECL_NAME (t) == name)
2944 /* Mark ARG for GC. */
2947 mark_binding_level (arg)
2950 struct binding_level *level = *(struct binding_level **) arg;
2952 for (; level != 0; level = level->level_chain)
2954 ggc_mark_tree (level->names);
2955 ggc_mark_tree (level->tags);
2956 ggc_mark_tree (level->shadowed);
2957 ggc_mark_tree (level->blocks);
2958 ggc_mark_tree (level->this_block);
2959 ggc_mark_tree (level->parm_order);
2963 /* Create the predefined scalar types of C,
2964 and some nodes representing standard constants (0, 1, (void *) 0).
2965 Initialize the global binding level.
2966 Make definitions for built-in primitive functions. */
2969 init_decl_processing ()
2971 register tree endlink;
2972 tree ptr_ftype_void, ptr_ftype_ptr;
2974 current_function_decl = NULL;
2975 named_labels = NULL;
2976 current_binding_level = NULL_BINDING_LEVEL;
2977 free_binding_level = NULL_BINDING_LEVEL;
2979 /* Make the binding_level structure for global names. */
2981 global_binding_level = current_binding_level;
2983 build_common_tree_nodes (flag_signed_char);
2985 c_common_nodes_and_builtins ();
2987 boolean_type_node = integer_type_node;
2988 boolean_true_node = integer_one_node;
2989 boolean_false_node = integer_zero_node;
2991 /* With GCC, C99's _Bool is always of size 1. */
2992 c_bool_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
2993 TREE_SET_CODE (c_bool_type_node, BOOLEAN_TYPE);
2994 TYPE_MAX_VALUE (c_bool_type_node) = build_int_2 (1, 0);
2995 TREE_TYPE (TYPE_MAX_VALUE (c_bool_type_node)) = c_bool_type_node;
2996 TYPE_PRECISION (c_bool_type_node) = 1;
2997 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2999 c_bool_false_node = build_int_2 (0, 0);
3000 TREE_TYPE (c_bool_false_node) = c_bool_type_node;
3001 c_bool_true_node = build_int_2 (1, 0);
3002 TREE_TYPE (c_bool_true_node) = c_bool_type_node;
3004 endlink = void_list_node;
3005 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
3007 = build_function_type (ptr_type_node,
3008 tree_cons (NULL_TREE, ptr_type_node, endlink));
3010 /* Types which are common to the fortran compiler and libf2c. When
3011 changing these, you also need to be concerned with f/com.h. */
3013 if (TYPE_PRECISION (float_type_node)
3014 == TYPE_PRECISION (long_integer_type_node))
3016 g77_integer_type_node = long_integer_type_node;
3017 g77_uinteger_type_node = long_unsigned_type_node;
3019 else if (TYPE_PRECISION (float_type_node)
3020 == TYPE_PRECISION (integer_type_node))
3022 g77_integer_type_node = integer_type_node;
3023 g77_uinteger_type_node = unsigned_type_node;
3026 g77_integer_type_node = g77_uinteger_type_node = NULL_TREE;
3028 if (g77_integer_type_node != NULL_TREE)
3030 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_integer"),
3031 g77_integer_type_node));
3032 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_uinteger"),
3033 g77_uinteger_type_node));
3036 if (TYPE_PRECISION (float_type_node) * 2
3037 == TYPE_PRECISION (long_integer_type_node))
3039 g77_longint_type_node = long_integer_type_node;
3040 g77_ulongint_type_node = long_unsigned_type_node;
3042 else if (TYPE_PRECISION (float_type_node) * 2
3043 == TYPE_PRECISION (long_long_integer_type_node))
3045 g77_longint_type_node = long_long_integer_type_node;
3046 g77_ulongint_type_node = long_long_unsigned_type_node;
3049 g77_longint_type_node = g77_ulongint_type_node = NULL_TREE;
3051 if (g77_longint_type_node != NULL_TREE)
3053 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_longint"),
3054 g77_longint_type_node));
3055 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_ulongint"),
3056 g77_ulongint_type_node));
3059 builtin_function ("__builtin_aggregate_incoming_address",
3060 build_function_type (ptr_type_node, NULL_TREE),
3061 BUILT_IN_AGGREGATE_INCOMING_ADDRESS,
3062 BUILT_IN_NORMAL, NULL);
3064 /* Hooks for the DWARF 2 __throw routine. */
3065 builtin_function ("__builtin_unwind_init",
3066 build_function_type (void_type_node, endlink),
3067 BUILT_IN_UNWIND_INIT, BUILT_IN_NORMAL, NULL);
3068 builtin_function ("__builtin_dwarf_cfa", ptr_ftype_void,
3069 BUILT_IN_DWARF_CFA, BUILT_IN_NORMAL, NULL);
3070 builtin_function ("__builtin_dwarf_fp_regnum",
3071 build_function_type (unsigned_type_node, endlink),
3072 BUILT_IN_DWARF_FP_REGNUM, BUILT_IN_NORMAL, NULL);
3073 builtin_function ("__builtin_init_dwarf_reg_size_table", void_ftype_ptr,
3074 BUILT_IN_INIT_DWARF_REG_SIZES, BUILT_IN_NORMAL, NULL);
3075 builtin_function ("__builtin_frob_return_addr", ptr_ftype_ptr,
3076 BUILT_IN_FROB_RETURN_ADDR, BUILT_IN_NORMAL, NULL);
3077 builtin_function ("__builtin_extract_return_addr", ptr_ftype_ptr,
3078 BUILT_IN_EXTRACT_RETURN_ADDR, BUILT_IN_NORMAL, NULL);
3080 ("__builtin_eh_return",
3081 build_function_type (void_type_node,
3082 tree_cons (NULL_TREE,
3083 type_for_mode (ptr_mode, 0),
3084 tree_cons (NULL_TREE,
3087 BUILT_IN_EH_RETURN, BUILT_IN_NORMAL, NULL);
3089 pedantic_lvalues = pedantic;
3091 make_fname_decl = c_make_fname_decl;
3092 start_fname_decls ();
3094 start_identifier_warnings ();
3096 /* Prepare to check format strings against argument lists. */
3097 init_function_format_info ();
3099 incomplete_decl_finalize_hook = finish_incomplete_decl;
3101 /* Record our roots. */
3103 ggc_add_tree_root (c_global_trees, CTI_MAX);
3104 ggc_add_root (&c_stmt_tree, 1, sizeof c_stmt_tree, mark_stmt_tree);
3105 ggc_add_tree_root (&c_scope_stmt_stack, 1);
3106 ggc_add_tree_root (&named_labels, 1);
3107 ggc_add_tree_root (&shadowed_labels, 1);
3108 ggc_add_root (¤t_binding_level, 1, sizeof current_binding_level,
3109 mark_binding_level);
3110 ggc_add_root (&label_level_chain, 1, sizeof label_level_chain,
3111 mark_binding_level);
3112 ggc_add_tree_root (&static_ctors, 1);
3113 ggc_add_tree_root (&static_dtors, 1);
3116 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3117 decl, NAME is the initialization string and TYPE_DEP indicates whether
3118 NAME depended on the type of the function. As we don't yet implement
3119 delayed emission of static data, we mark the decl as emitted
3120 so it is not placed in the output. Anything using it must therefore pull
3121 out the STRING_CST initializer directly. This does mean that these names
3122 are string merging candidates, which is wrong for C99's __func__. FIXME. */
3125 c_make_fname_decl (id, type_dep)
3129 const char *name = fname_as_string (type_dep);
3130 tree decl, type, init;
3131 size_t length = strlen (name);
3133 type = build_array_type
3134 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
3135 build_index_type (size_int (length)));
3137 decl = build_decl (VAR_DECL, id, type);
3138 /* We don't push the decl, so have to set its context here. */
3139 DECL_CONTEXT (decl) = current_function_decl;
3141 TREE_STATIC (decl) = 1;
3142 TREE_READONLY (decl) = 1;
3143 DECL_ARTIFICIAL (decl) = 1;
3145 init = build_string (length + 1, name);
3146 TREE_TYPE (init) = type;
3147 DECL_INITIAL (decl) = init;
3149 TREE_USED (decl) = 1;
3151 finish_decl (decl, init, NULL_TREE);
3156 /* Return a definition for a builtin function named NAME and whose data type
3157 is TYPE. TYPE should be a function type with argument types.
3158 FUNCTION_CODE tells later passes how to compile calls to this function.
3159 See tree.h for its possible values.
3161 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3162 the name to be called if we can't opencode the function. */
3165 builtin_function (name, type, function_code, class, library_name)
3169 enum built_in_class class;
3170 const char *library_name;
3172 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3173 DECL_EXTERNAL (decl) = 1;
3174 TREE_PUBLIC (decl) = 1;
3175 /* If -traditional, permit redefining a builtin function any way you like.
3176 (Though really, if the program redefines these functions,
3177 it probably won't work right unless compiled with -fno-builtin.) */
3178 if (flag_traditional && name[0] != '_')
3179 DECL_BUILT_IN_NONANSI (decl) = 1;
3181 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
3182 make_decl_rtl (decl, NULL);
3184 DECL_BUILT_IN_CLASS (decl) = class;
3185 DECL_FUNCTION_CODE (decl) = function_code;
3187 /* Warn if a function in the namespace for users
3188 is used without an occasion to consider it declared. */
3189 if (name[0] != '_' || name[1] != '_')
3190 C_DECL_ANTICIPATED (decl) = 1;
3195 /* Called when a declaration is seen that contains no names to declare.
3196 If its type is a reference to a structure, union or enum inherited
3197 from a containing scope, shadow that tag name for the current scope
3198 with a forward reference.
3199 If its type defines a new named structure or union
3200 or defines an enum, it is valid but we need not do anything here.
3201 Otherwise, it is an error. */
3204 shadow_tag (declspecs)
3207 shadow_tag_warned (declspecs, 0);
3211 shadow_tag_warned (declspecs, warned)
3214 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3221 pending_invalid_xref = 0;
3223 /* Remove the attributes from declspecs, since they will confuse the
3225 split_specs_attrs (declspecs, &specs, &attrs);
3227 for (link = specs; link; link = TREE_CHAIN (link))
3229 register tree value = TREE_VALUE (link);
3230 register enum tree_code code = TREE_CODE (value);
3232 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3233 /* Used to test also that TYPE_SIZE (value) != 0.
3234 That caused warning for `struct foo;' at top level in the file. */
3236 register tree name = lookup_tag_reverse (value);
3243 if (warned != 1 && code != ENUMERAL_TYPE)
3244 /* Empty unnamed enum OK */
3246 pedwarn ("unnamed struct/union that defines no instances");
3252 t = lookup_tag (code, name, current_binding_level, 1);
3256 t = make_node (code);
3263 if (!warned && ! in_system_header)
3265 warning ("useless keyword or type name in empty declaration");
3272 error ("two types specified in one empty declaration");
3277 pedwarn ("empty declaration");
3281 /* Construct an array declarator. EXPR is the expression inside [], or
3282 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
3283 to the pointer to which a parameter array is converted). STATIC_P is
3284 non-zero if "static" is inside the [], zero otherwise. VLA_UNSPEC_P
3285 is non-zero is the array is [*], a VLA of unspecified length which is
3286 nevertheless a complete type (not currently implemented by GCC),
3287 zero otherwise. The declarator is constructed as an ARRAY_REF
3288 (to be decoded by grokdeclarator), whose operand 0 is what's on the
3289 left of the [] (filled by in set_array_declarator_type) and operand 1
3290 is the expression inside; whose TREE_TYPE is the type qualifiers and
3291 which has TREE_STATIC set if "static" is used. */
3294 build_array_declarator (expr, quals, static_p, vla_unspec_p)
3301 decl = build_nt (ARRAY_REF, NULL_TREE, expr);
3302 TREE_TYPE (decl) = quals;
3303 TREE_STATIC (decl) = (static_p ? 1 : 0);
3304 if (pedantic && !flag_isoc99)
3306 if (static_p || quals != NULL_TREE)
3307 pedwarn ("ISO C89 does not support `static' or type qualifiers in parameter array declarators");
3309 pedwarn ("ISO C89 does not support `[*]' array declarators");
3312 warning ("GCC does not yet properly implement `[*]' array declarators");
3316 /* Set the type of an array declarator. DECL is the declarator, as
3317 constructed by build_array_declarator; TYPE is what appears on the left
3318 of the [] and goes in operand 0. ABSTRACT_P is non-zero if it is an
3319 abstract declarator, zero otherwise; this is used to reject static and
3320 type qualifiers in abstract declarators, where they are not in the
3324 set_array_declarator_type (decl, type, abstract_p)
3329 TREE_OPERAND (decl, 0) = type;
3330 if (abstract_p && (TREE_TYPE (decl) != NULL_TREE || TREE_STATIC (decl)))
3331 error ("static or type qualifiers in abstract declarator");
3335 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3338 groktypename (typename)
3341 if (TREE_CODE (typename) != TREE_LIST)
3343 return grokdeclarator (TREE_VALUE (typename),
3344 TREE_PURPOSE (typename),
3348 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3351 groktypename_in_parm_context (typename)
3354 if (TREE_CODE (typename) != TREE_LIST)
3356 return grokdeclarator (TREE_VALUE (typename),
3357 TREE_PURPOSE (typename),
3361 /* Decode a declarator in an ordinary declaration or data definition.
3362 This is called as soon as the type information and variable name
3363 have been parsed, before parsing the initializer if any.
3364 Here we create the ..._DECL node, fill in its type,
3365 and put it on the list of decls for the current context.
3366 The ..._DECL node is returned as the value.
3368 Exception: for arrays where the length is not specified,
3369 the type is left null, to be filled in by `finish_decl'.
3371 Function definitions do not come here; they go to start_function
3372 instead. However, external and forward declarations of functions
3373 do go through here. Structure field declarations are done by
3374 grokfield and not through here. */
3377 start_decl (declarator, declspecs, initialized, attributes, prefix_attributes)
3378 tree declarator, declspecs;
3380 tree attributes, prefix_attributes;
3382 register tree decl = grokdeclarator (declarator, declspecs,
3383 NORMAL, initialized);
3386 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3387 && MAIN_NAME_P (DECL_NAME (decl)))
3388 warning_with_decl (decl, "`%s' is usually a function");
3391 /* Is it valid for this decl to have an initializer at all?
3392 If not, set INITIALIZED to zero, which will indirectly
3393 tell `finish_decl' to ignore the initializer once it is parsed. */
3394 switch (TREE_CODE (decl))
3397 /* typedef foo = bar means give foo the same type as bar.
3398 We haven't parsed bar yet, so `finish_decl' will fix that up.
3399 Any other case of an initialization in a TYPE_DECL is an error. */
3400 if (pedantic || list_length (declspecs) > 1)
3402 error ("typedef `%s' is initialized",
3403 IDENTIFIER_POINTER (DECL_NAME (decl)));
3409 error ("function `%s' is initialized like a variable",
3410 IDENTIFIER_POINTER (DECL_NAME (decl)));
3415 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3416 error ("parameter `%s' is initialized",
3417 IDENTIFIER_POINTER (DECL_NAME (decl)));
3422 /* Don't allow initializations for incomplete types
3423 except for arrays which might be completed by the initialization. */
3425 /* This can happen if the array size is an undefined macro. We already
3426 gave a warning, so we don't need another one. */
3427 if (TREE_TYPE (decl) == error_mark_node)
3429 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3431 /* A complete type is ok if size is fixed. */
3433 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3434 || C_DECL_VARIABLE_SIZE (decl))
3436 error ("variable-sized object may not be initialized");
3440 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3442 error ("variable `%s' has initializer but incomplete type",
3443 IDENTIFIER_POINTER (DECL_NAME (decl)));
3446 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
3448 error ("elements of array `%s' have incomplete type",
3449 IDENTIFIER_POINTER (DECL_NAME (decl)));
3457 /* Seems redundant with grokdeclarator. */
3458 if (current_binding_level != global_binding_level
3459 && DECL_EXTERNAL (decl)
3460 && TREE_CODE (decl) != FUNCTION_DECL)
3461 warning ("declaration of `%s' has `extern' and is initialized",
3462 IDENTIFIER_POINTER (DECL_NAME (decl)));
3464 DECL_EXTERNAL (decl) = 0;
3465 if (current_binding_level == global_binding_level)
3466 TREE_STATIC (decl) = 1;
3468 /* Tell `pushdecl' this is an initialized decl
3469 even though we don't yet have the initializer expression.
3470 Also tell `finish_decl' it may store the real initializer. */
3471 DECL_INITIAL (decl) = error_mark_node;
3474 /* If this is a function declaration, write a record describing it to the
3475 prototypes file (if requested). */
3477 if (TREE_CODE (decl) == FUNCTION_DECL)
3478 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3480 /* ANSI specifies that a tentative definition which is not merged with
3481 a non-tentative definition behaves exactly like a definition with an
3482 initializer equal to zero. (Section 3.7.2)
3483 -fno-common gives strict ANSI behavior. Usually you don't want it.
3484 This matters only for variables with external linkage. */
3485 if (! flag_no_common || ! TREE_PUBLIC (decl))
3486 DECL_COMMON (decl) = 1;
3488 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
3489 SET_DEFAULT_DECL_ATTRIBUTES (decl, attributes);
3492 /* Set attributes here so if duplicate decl, will have proper attributes. */
3493 decl_attributes (decl, attributes, prefix_attributes);
3495 /* Add this decl to the current binding level.
3496 TEM may equal DECL or it may be a previous decl of the same name. */
3497 tem = pushdecl (decl);
3499 /* For a local variable, define the RTL now. */
3500 if (current_binding_level != global_binding_level
3501 /* But not if this is a duplicate decl
3502 and we preserved the rtl from the previous one
3503 (which may or may not happen). */
3504 && !DECL_RTL_SET_P (tem)
3505 && !DECL_CONTEXT (tem))
3507 if (TREE_TYPE (tem) != error_mark_node
3508 && COMPLETE_TYPE_P (TREE_TYPE (tem)))
3510 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3511 && DECL_INITIAL (tem) != 0)
3518 /* Finish processing of a declaration;
3519 install its initial value.
3520 If the length of an array type is not known before,
3521 it must be determined now, from the initial value, or it is an error. */
3524 finish_decl (decl, init, asmspec_tree)
3528 register tree type = TREE_TYPE (decl);
3529 int was_incomplete = (DECL_SIZE (decl) == 0);
3530 const char *asmspec = 0;
3532 /* If a name was specified, get the string. */
3534 asmspec = TREE_STRING_POINTER (asmspec_tree);
3536 /* If `start_decl' didn't like having an initialization, ignore it now. */
3537 if (init != 0 && DECL_INITIAL (decl) == 0)
3540 /* Don't crash if parm is initialized. */
3541 if (TREE_CODE (decl) == PARM_DECL)
3546 if (TREE_CODE (decl) != TYPE_DECL)
3547 store_init_value (decl, init);
3550 /* typedef foo = bar; store the type of bar as the type of foo. */
3551 TREE_TYPE (decl) = TREE_TYPE (init);
3552 DECL_INITIAL (decl) = init = 0;
3556 /* Deduce size of array from initialization, if not already known */
3557 if (TREE_CODE (type) == ARRAY_TYPE
3558 && TYPE_DOMAIN (type) == 0
3559 && TREE_CODE (decl) != TYPE_DECL)
3562 = (TREE_STATIC (decl)
3563 /* Even if pedantic, an external linkage array
3564 may have incomplete type at first. */
3565 ? pedantic && !TREE_PUBLIC (decl)
3566 : !DECL_EXTERNAL (decl));
3568 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3570 /* Get the completed type made by complete_array_type. */
3571 type = TREE_TYPE (decl);
3574 error_with_decl (decl, "initializer fails to determine size of `%s'");
3576 else if (failure == 2)
3579 error_with_decl (decl, "array size missing in `%s'");
3580 /* If a `static' var's size isn't known,
3581 make it extern as well as static, so it does not get
3583 If it is not `static', then do not mark extern;
3584 finish_incomplete_decl will give it a default size
3585 and it will get allocated. */
3586 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3587 DECL_EXTERNAL (decl) = 1;
3590 /* TYPE_MAX_VALUE is always one less than the number of elements
3591 in the array, because we start counting at zero. Therefore,
3592 warn only if the value is less than zero. */
3593 else if (pedantic && TYPE_DOMAIN (type) != 0
3594 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3595 error_with_decl (decl, "zero or negative size array `%s'");
3597 layout_decl (decl, 0);
3600 if (TREE_CODE (decl) == VAR_DECL)
3602 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
3603 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3604 layout_decl (decl, 0);
3606 if (DECL_SIZE (decl) == 0
3607 /* Don't give an error if we already gave one earlier. */
3608 && TREE_TYPE (decl) != error_mark_node
3609 && (TREE_STATIC (decl)
3611 /* A static variable with an incomplete type
3612 is an error if it is initialized.
3613 Also if it is not file scope.
3614 Otherwise, let it through, but if it is not `extern'
3615 then it may cause an error message later. */
3616 (DECL_INITIAL (decl) != 0
3617 || DECL_CONTEXT (decl) != 0)
3619 /* An automatic variable with an incomplete type
3621 !DECL_EXTERNAL (decl)))
3623 error_with_decl (decl, "storage size of `%s' isn't known");
3624 TREE_TYPE (decl) = error_mark_node;
3627 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3628 && DECL_SIZE (decl) != 0)
3630 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3631 constant_expression_warning (DECL_SIZE (decl));
3633 error_with_decl (decl, "storage size of `%s' isn't constant");
3636 if (TREE_USED (type))
3637 TREE_USED (decl) = 1;
3640 /* If this is a function and an assembler name is specified, it isn't
3641 builtin any more. Also reset DECL_RTL so we can give it its new
3643 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3645 DECL_BUILT_IN_CLASS (decl) = NOT_BUILT_IN;
3646 SET_DECL_RTL (decl, NULL_RTX);
3647 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
3650 /* Output the assembler code and/or RTL code for variables and functions,
3651 unless the type is an undefined structure or union.
3652 If not, it will get done when the type is completed. */
3654 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3656 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3657 maybe_objc_check_decl (decl);
3659 if (!DECL_CONTEXT (decl))
3661 if (DECL_INITIAL (decl) == NULL_TREE
3662 || DECL_INITIAL (decl) == error_mark_node)
3663 /* Don't output anything
3664 when a tentative file-scope definition is seen.
3665 But at end of compilation, do output code for them. */
3666 DECL_DEFER_OUTPUT (decl) = 1;
3667 rest_of_decl_compilation (decl, asmspec,
3668 (DECL_CONTEXT (decl) == 0
3669 || TREE_ASM_WRITTEN (decl)), 0);
3673 /* This is a local variable. If there is an ASMSPEC, the
3674 user has requested that we handle it specially. */
3677 /* In conjunction with an ASMSPEC, the `register'
3678 keyword indicates that we should place the variable
3679 in a particular register. */
3680 if (DECL_REGISTER (decl))
3681 DECL_C_HARD_REGISTER (decl) = 1;
3683 /* If this is not a static variable, issue a warning.
3684 It doesn't make any sense to give an ASMSPEC for an
3685 ordinary, non-register local variable. Historically,
3686 GCC has accepted -- but ignored -- the ASMSPEC in
3688 if (TREE_CODE (decl) == VAR_DECL
3689 && !DECL_REGISTER (decl)
3690 && !TREE_STATIC (decl))
3691 warning_with_decl (decl,
3692 "ignoring asm-specifier for non-static local variable `%s'");
3694 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
3697 add_decl_stmt (decl);
3700 if (DECL_CONTEXT (decl) != 0)
3702 /* Recompute the RTL of a local array now
3703 if it used to be an incomplete type. */
3705 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3707 /* If we used it already as memory, it must stay in memory. */
3708 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3709 /* If it's still incomplete now, no init will save it. */
3710 if (DECL_SIZE (decl) == 0)
3711 DECL_INITIAL (decl) = 0;
3716 if (TREE_CODE (decl) == TYPE_DECL)
3718 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3719 maybe_objc_check_decl (decl);
3720 rest_of_decl_compilation (decl, NULL, DECL_CONTEXT (decl) == 0, 0);
3723 /* At the end of a declaration, throw away any variable type sizes
3724 of types defined inside that declaration. There is no use
3725 computing them in the following function definition. */
3726 if (current_binding_level == global_binding_level)
3727 get_pending_sizes ();
3730 /* If DECL has a cleanup, build and return that cleanup here.
3731 This is a callback called by expand_expr. */
3734 maybe_build_cleanup (decl)
3735 tree decl ATTRIBUTE_UNUSED;
3737 /* There are no cleanups in C. */
3741 /* Given a parsed parameter declaration,
3742 decode it into a PARM_DECL and push that on the current binding level.
3743 Also, for the sake of forward parm decls,
3744 record the given order of parms in `parm_order'. */
3747 push_parm_decl (parm)
3751 int old_immediate_size_expand = immediate_size_expand;
3752 /* Don't try computing parm sizes now -- wait till fn is called. */
3753 immediate_size_expand = 0;
3755 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3756 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3757 decl_attributes (decl, TREE_VALUE (TREE_VALUE (parm)),
3758 TREE_PURPOSE (TREE_VALUE (parm)));
3761 if (DECL_NAME (decl))
3764 olddecl = lookup_name (DECL_NAME (decl));
3765 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3766 pedwarn_with_decl (decl,
3767 "ANSI C forbids parameter `%s' shadowing typedef");
3771 decl = pushdecl (decl);
3773 immediate_size_expand = old_immediate_size_expand;
3775 current_binding_level->parm_order
3776 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3778 /* Add this decl to the current binding level. */
3779 finish_decl (decl, NULL_TREE, NULL_TREE);
3782 /* Clear the given order of parms in `parm_order'.
3783 Used at start of parm list,
3784 and also at semicolon terminating forward decls. */
3789 current_binding_level->parm_order = NULL_TREE;
3792 /* Make TYPE a complete type based on INITIAL_VALUE.
3793 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3794 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3797 complete_array_type (type, initial_value, do_default)
3802 register tree maxindex = NULL_TREE;
3807 /* Note MAXINDEX is really the maximum index,
3808 one less than the size. */
3809 if (TREE_CODE (initial_value) == STRING_CST)
3812 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3813 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3816 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3818 tree elts = CONSTRUCTOR_ELTS (initial_value);
3819 maxindex = build_int_2 (-1, -1);
3820 for (; elts; elts = TREE_CHAIN (elts))
3822 if (TREE_PURPOSE (elts))
3823 maxindex = TREE_PURPOSE (elts);
3825 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3826 maxindex, integer_one_node));
3828 maxindex = copy_node (maxindex);
3832 /* Make an error message unless that happened already. */
3833 if (initial_value != error_mark_node)
3836 /* Prevent further error messages. */
3837 maxindex = build_int_2 (0, 0);
3844 maxindex = build_int_2 (0, 0);
3850 TYPE_DOMAIN (type) = build_index_type (maxindex);
3851 if (!TREE_TYPE (maxindex))
3852 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3855 /* Lay out the type now that we can get the real answer. */
3862 /* Given declspecs and a declarator,
3863 determine the name and type of the object declared
3864 and construct a ..._DECL node for it.
3865 (In one case we can return a ..._TYPE node instead.
3866 For invalid input we sometimes return 0.)
3868 DECLSPECS is a chain of tree_list nodes whose value fields
3869 are the storage classes and type specifiers.
3871 DECL_CONTEXT says which syntactic context this declaration is in:
3872 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3873 FUNCDEF for a function definition. Like NORMAL but a few different
3874 error messages in each case. Return value may be zero meaning
3875 this definition is too screwy to try to parse.
3876 PARM for a parameter declaration (either within a function prototype
3877 or before a function body). Make a PARM_DECL, or return void_type_node.
3878 TYPENAME if for a typename (in a cast or sizeof).
3879 Don't make a DECL node; just return the ..._TYPE node.
3880 FIELD for a struct or union field; make a FIELD_DECL.
3881 BITFIELD for a field with specified width.
3882 INITIALIZED is 1 if the decl has an initializer.
3884 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3885 It may also be so in the PARM case, for a prototype where the
3886 argument type is specified but not the name.
3888 This function is where the complicated C meanings of `static'
3889 and `extern' are interpreted. */
3892 grokdeclarator (declarator, declspecs, decl_context, initialized)
3895 enum decl_context decl_context;
3900 tree type = NULL_TREE;
3905 int type_quals = TYPE_UNQUALIFIED;
3907 int explicit_int = 0;
3908 int explicit_char = 0;
3909 int defaulted_int = 0;
3910 tree typedef_decl = 0;
3912 tree typedef_type = 0;
3913 int funcdef_flag = 0;
3914 enum tree_code innermost_code = ERROR_MARK;
3916 int size_varies = 0;
3917 tree decl_machine_attr = NULL_TREE;
3918 tree array_ptr_quals = NULL_TREE;
3919 int array_parm_static = 0;
3921 if (decl_context == BITFIELD)
3922 bitfield = 1, decl_context = FIELD;
3924 if (decl_context == FUNCDEF)
3925 funcdef_flag = 1, decl_context = NORMAL;
3927 /* Look inside a declarator for the name being declared
3928 and get it as a string, for an error message. */
3930 register tree decl = declarator;
3934 switch (TREE_CODE (decl))
3939 innermost_code = TREE_CODE (decl);
3940 decl = TREE_OPERAND (decl, 0);
3943 case IDENTIFIER_NODE:
3944 name = IDENTIFIER_POINTER (decl);
3955 /* A function definition's declarator must have the form of
3956 a function declarator. */
3958 if (funcdef_flag && innermost_code != CALL_EXPR)
3961 /* Anything declared one level down from the top level
3962 must be one of the parameters of a function
3963 (because the body is at least two levels down). */
3965 /* If this looks like a function definition, make it one,
3966 even if it occurs where parms are expected.
3967 Then store_parm_decls will reject it and not use it as a parm. */
3968 if (decl_context == NORMAL && !funcdef_flag
3969 && current_binding_level->parm_flag)
3970 decl_context = PARM;
3972 /* Look through the decl specs and record which ones appear.
3973 Some typespecs are defined as built-in typenames.
3974 Others, the ones that are modifiers of other types,
3975 are represented by bits in SPECBITS: set the bits for
3976 the modifiers that appear. Storage class keywords are also in SPECBITS.
3978 If there is a typedef name or a type, store the type in TYPE.
3979 This includes builtin typedefs such as `int'.
3981 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3982 and did not come from a user typedef.
3984 Set LONGLONG if `long' is mentioned twice. */
3986 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3988 register tree id = TREE_VALUE (spec);
3990 if (id == ridpointers[(int) RID_INT])
3992 if (id == ridpointers[(int) RID_CHAR])
3995 if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
3997 enum rid i = C_RID_CODE (id);
3998 if ((int) i <= (int) RID_LAST_MODIFIER)
4000 if (i == RID_LONG && (specbits & (1 << (int) i)))
4003 error ("`long long long' is too long for GCC");
4006 if (pedantic && !flag_isoc99 && ! in_system_header
4008 pedwarn ("ISO C89 does not support `long long'");
4012 else if (specbits & (1 << (int) i))
4013 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
4014 specbits |= 1 << (int) i;
4019 error ("two or more data types in declaration of `%s'", name);
4020 /* Actual typedefs come to us as TYPE_DECL nodes. */
4021 else if (TREE_CODE (id) == TYPE_DECL)
4023 type = TREE_TYPE (id);
4024 decl_machine_attr = DECL_MACHINE_ATTRIBUTES (id);
4027 /* Built-in types come as identifiers. */
4028 else if (TREE_CODE (id) == IDENTIFIER_NODE)
4030 register tree t = lookup_name (id);
4031 if (TREE_TYPE (t) == error_mark_node)
4033 else if (!t || TREE_CODE (t) != TYPE_DECL)
4034 error ("`%s' fails to be a typedef or built in type",
4035 IDENTIFIER_POINTER (id));
4038 type = TREE_TYPE (t);
4042 else if (TREE_CODE (id) != ERROR_MARK)
4049 typedef_type = type;
4051 size_varies = C_TYPE_VARIABLE_SIZE (type);
4053 /* No type at all: default to `int', and set DEFAULTED_INT
4054 because it was not a user-defined typedef. */
4058 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4059 | (1 << (int) RID_SIGNED)
4060 | (1 << (int) RID_UNSIGNED)
4061 | (1 << (int) RID_COMPLEX))))
4062 /* Don't warn about typedef foo = bar. */
4063 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
4064 && ! in_system_header)
4066 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
4067 and this is a function, or if -Wimplicit; prefer the former
4068 warning since it is more explicit. */
4069 if ((warn_implicit_int || warn_return_type || flag_isoc99)
4071 warn_about_return_type = 1;
4072 else if (warn_implicit_int || flag_isoc99)
4073 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
4078 type = integer_type_node;
4081 /* Now process the modifiers that were specified
4082 and check for invalid combinations. */
4084 /* Long double is a special combination. */
4086 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4087 && TYPE_MAIN_VARIANT (type) == double_type_node)
4089 specbits &= ~(1 << (int) RID_LONG);
4090 type = long_double_type_node;
4093 /* Check all other uses of type modifiers. */
4095 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4096 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4100 if ((specbits & 1 << (int) RID_LONG)
4101 && (specbits & 1 << (int) RID_SHORT))
4102 error ("both long and short specified for `%s'", name);
4103 else if (((specbits & 1 << (int) RID_LONG)
4104 || (specbits & 1 << (int) RID_SHORT))
4106 error ("long or short specified with char for `%s'", name);
4107 else if (((specbits & 1 << (int) RID_LONG)
4108 || (specbits & 1 << (int) RID_SHORT))
4109 && TREE_CODE (type) == REAL_TYPE)
4111 static int already = 0;
4113 error ("long or short specified with floating type for `%s'", name);
4114 if (! already && ! pedantic)
4116 error ("the only valid combination is `long double'");
4120 else if ((specbits & 1 << (int) RID_SIGNED)
4121 && (specbits & 1 << (int) RID_UNSIGNED))
4122 error ("both signed and unsigned specified for `%s'", name);
4123 else if (TREE_CODE (type) != INTEGER_TYPE)
4124 error ("long, short, signed or unsigned invalid for `%s'", name);
4128 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4130 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4132 if (flag_pedantic_errors)
4137 /* Discard the type modifiers if they are invalid. */
4140 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4141 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4146 if ((specbits & (1 << (int) RID_COMPLEX))
4147 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4149 error ("complex invalid for `%s'", name);
4150 specbits &= ~(1 << (int) RID_COMPLEX);
4153 /* Decide whether an integer type is signed or not.
4154 Optionally treat bitfields as signed by default. */
4155 if (specbits & 1 << (int) RID_UNSIGNED
4156 /* Traditionally, all bitfields are unsigned. */
4157 || (bitfield && flag_traditional
4158 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4159 || (bitfield && ! flag_signed_bitfields
4160 && (explicit_int || defaulted_int || explicit_char
4161 /* A typedef for plain `int' without `signed'
4162 can be controlled just like plain `int'. */
4163 || ! (typedef_decl != 0
4164 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4165 && TREE_CODE (type) != ENUMERAL_TYPE
4166 && !(specbits & 1 << (int) RID_SIGNED)))
4169 type = long_long_unsigned_type_node;
4170 else if (specbits & 1 << (int) RID_LONG)
4171 type = long_unsigned_type_node;
4172 else if (specbits & 1 << (int) RID_SHORT)
4173 type = short_unsigned_type_node;
4174 else if (type == char_type_node)
4175 type = unsigned_char_type_node;
4176 else if (typedef_decl)
4177 type = unsigned_type (type);
4179 type = unsigned_type_node;
4181 else if ((specbits & 1 << (int) RID_SIGNED)
4182 && type == char_type_node)
4183 type = signed_char_type_node;
4185 type = long_long_integer_type_node;
4186 else if (specbits & 1 << (int) RID_LONG)
4187 type = long_integer_type_node;
4188 else if (specbits & 1 << (int) RID_SHORT)
4189 type = short_integer_type_node;
4191 if (specbits & 1 << (int) RID_COMPLEX)
4193 if (pedantic && !flag_isoc99)
4194 pedwarn ("ISO C89 does not support complex types");
4195 /* If we just have "complex", it is equivalent to
4196 "complex double", but if any modifiers at all are specified it is
4197 the complex form of TYPE. E.g, "complex short" is
4198 "complex short int". */
4200 if (defaulted_int && ! longlong
4201 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4202 | (1 << (int) RID_SIGNED)
4203 | (1 << (int) RID_UNSIGNED))))
4206 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
4207 type = complex_double_type_node;
4209 else if (type == integer_type_node)
4212 pedwarn ("ISO C does not support complex integer types");
4213 type = complex_integer_type_node;
4215 else if (type == float_type_node)
4216 type = complex_float_type_node;
4217 else if (type == double_type_node)
4218 type = complex_double_type_node;
4219 else if (type == long_double_type_node)
4220 type = complex_long_double_type_node;
4224 pedwarn ("ISO C does not support complex integer types");
4225 type = build_complex_type (type);
4229 /* Figure out the type qualifiers for the declaration. There are
4230 two ways a declaration can become qualified. One is something
4231 like `const int i' where the `const' is explicit. Another is
4232 something like `typedef const int CI; CI i' where the type of the
4233 declaration contains the `const'. */
4234 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4235 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
4236 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4237 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4238 if (constp > 1 && ! flag_isoc99)
4239 pedwarn ("duplicate `const'");
4240 if (restrictp > 1 && ! flag_isoc99)
4241 pedwarn ("duplicate `restrict'");
4242 if (volatilep > 1 && ! flag_isoc99)
4243 pedwarn ("duplicate `volatile'");
4244 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
4245 type = TYPE_MAIN_VARIANT (type);
4246 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4247 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4248 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4250 /* Warn if two storage classes are given. Default to `auto'. */
4255 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4256 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4257 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4258 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4259 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4261 /* Warn about storage classes that are invalid for certain
4262 kinds of declarations (parameters, typenames, etc.). */
4265 error ("multiple storage classes in declaration of `%s'", name);
4266 else if (funcdef_flag
4268 & ((1 << (int) RID_REGISTER)
4269 | (1 << (int) RID_AUTO)
4270 | (1 << (int) RID_TYPEDEF))))
4272 if (specbits & 1 << (int) RID_AUTO
4273 && (pedantic || current_binding_level == global_binding_level))
4274 pedwarn ("function definition declared `auto'");
4275 if (specbits & 1 << (int) RID_REGISTER)
4276 error ("function definition declared `register'");
4277 if (specbits & 1 << (int) RID_TYPEDEF)
4278 error ("function definition declared `typedef'");
4279 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4280 | (1 << (int) RID_AUTO));
4282 else if (decl_context != NORMAL && nclasses > 0)
4284 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4288 switch (decl_context)
4291 error ("storage class specified for structure field `%s'",
4295 error ("storage class specified for parameter `%s'", name);
4298 error ("storage class specified for typename");
4301 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4302 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4303 | (1 << (int) RID_EXTERN));
4306 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4308 /* `extern' with initialization is invalid if not at top level. */
4309 if (current_binding_level == global_binding_level)
4310 warning ("`%s' initialized and declared `extern'", name);
4312 error ("`%s' has both `extern' and initializer", name);
4314 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4315 && current_binding_level != global_binding_level)
4316 error ("nested function `%s' declared `extern'", name);
4317 else if (current_binding_level == global_binding_level
4318 && specbits & (1 << (int) RID_AUTO))
4319 error ("top-level declaration of `%s' specifies `auto'", name);
4322 /* Now figure out the structure of the declarator proper.
4323 Descend through it, creating more complex types, until we reach
4324 the declared identifier (or NULL_TREE, in an absolute declarator). */
4326 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4328 if (type == error_mark_node)
4330 declarator = TREE_OPERAND (declarator, 0);
4334 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4335 an INDIRECT_REF (for *...),
4336 a CALL_EXPR (for ...(...)),
4337 an identifier (for the name being declared)
4338 or a null pointer (for the place in an absolute declarator
4339 where the name was omitted).
4340 For the last two cases, we have just exited the loop.
4342 At this point, TYPE is the type of elements of an array,
4343 or for a function to return, or for a pointer to point to.
4344 After this sequence of ifs, TYPE is the type of the
4345 array or function or pointer, and DECLARATOR has had its
4346 outermost layer removed. */
4348 if (array_ptr_quals != NULL_TREE || array_parm_static)
4350 /* Only the innermost declarator (making a parameter be of
4351 array type which is converted to pointer type)
4352 may have static or type qualifiers. */
4353 error ("static or type qualifiers in non-parameter array declarator");
4354 array_ptr_quals = NULL_TREE;
4355 array_parm_static = 0;
4358 if (TREE_CODE (declarator) == ARRAY_REF)
4360 register tree itype = NULL_TREE;
4361 register tree size = TREE_OPERAND (declarator, 1);
4362 /* The index is a signed object `sizetype' bits wide. */
4363 tree index_type = signed_type (sizetype);
4365 array_ptr_quals = TREE_TYPE (declarator);
4366 array_parm_static = TREE_STATIC (declarator);
4368 declarator = TREE_OPERAND (declarator, 0);
4370 /* Check for some types that there cannot be arrays of. */
4372 if (VOID_TYPE_P (type))
4374 error ("declaration of `%s' as array of voids", name);
4375 type = error_mark_node;
4378 if (TREE_CODE (type) == FUNCTION_TYPE)
4380 error ("declaration of `%s' as array of functions", name);
4381 type = error_mark_node;
4384 if (size == error_mark_node)
4385 type = error_mark_node;
4387 if (type == error_mark_node)
4390 /* If size was specified, set ITYPE to a range-type for that size.
4391 Otherwise, ITYPE remains null. finish_decl may figure it out
4392 from an initial value. */
4396 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4397 STRIP_TYPE_NOPS (size);
4399 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
4400 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
4402 error ("size of array `%s' has non-integer type", name);
4403 size = integer_one_node;
4406 if (pedantic && integer_zerop (size))
4407 pedwarn ("ISO C forbids zero-size array `%s'", name);
4409 if (TREE_CODE (size) == INTEGER_CST)
4411 constant_expression_warning (size);
4412 if (tree_int_cst_sgn (size) < 0)
4414 error ("size of array `%s' is negative", name);
4415 size = integer_one_node;
4420 /* Make sure the array size remains visibly nonconstant
4421 even if it is (eg) a const variable with known value. */
4426 if (TREE_CONSTANT (size))
4427 pedwarn ("ISO C89 forbids array `%s' whose size can't be evaluated",
4430 pedwarn ("ISO C89 forbids variable-size array `%s'",
4435 if (integer_zerop (size))
4437 /* A zero-length array cannot be represented with an
4438 unsigned index type, which is what we'll get with
4439 build_index_type. Create an open-ended range instead. */
4440 itype = build_range_type (sizetype, size, NULL_TREE);
4444 /* Compute the maximum valid index, that is, size - 1.
4445 Do the calculation in index_type, so that if it is
4446 a variable the computations will be done in the
4448 itype = fold (build (MINUS_EXPR, index_type,
4449 convert (index_type, size),
4450 convert (index_type, size_one_node)));
4452 /* If that overflowed, the array is too big.
4453 ??? While a size of INT_MAX+1 technically shouldn't
4454 cause an overflow (because we subtract 1), the overflow
4455 is recorded during the conversion to index_type, before
4456 the subtraction. Handling this case seems like an
4457 unnecessary complication. */
4458 if (TREE_OVERFLOW (itype))
4460 error ("size of array `%s' is too large", name);
4461 type = error_mark_node;
4466 itype = variable_size (itype);
4467 itype = build_index_type (itype);
4470 else if (decl_context == FIELD)
4472 /* ??? Need to check somewhere that this is a structure
4473 and not a union, that this field is last, and that
4474 this structure has at least one other named member. */
4476 if (pedantic && !flag_isoc99 && !in_system_header)
4477 pedwarn ("ISO C89 does not support flexible array members");
4479 /* ISO C99 Flexible array members are effectively identical
4480 to GCC's zero-length array extension. */
4481 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4484 /* If pedantic, complain about arrays of incomplete types. */
4486 if (pedantic && !COMPLETE_TYPE_P (type))
4487 pedwarn ("array type has incomplete element type");
4490 /* We shouldn't have a function type here at all!
4491 Functions aren't allowed as array elements. */
4492 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4493 && (constp || volatilep))
4494 pedwarn ("ANSI C forbids const or volatile function types");
4497 /* Build the array type itself, then merge any constancy or
4498 volatility into the target type. We must do it in this order
4499 to ensure that the TYPE_MAIN_VARIANT field of the array type
4500 is set correctly. */
4502 type = build_array_type (type, itype);
4504 type = c_build_qualified_type (type, type_quals);
4507 C_TYPE_VARIABLE_SIZE (type) = 1;
4509 /* The GCC extension for zero-length arrays differs from
4510 ISO flexible array members in that sizeof yields zero. */
4511 if (size && integer_zerop (size))
4514 TYPE_SIZE (type) = bitsize_zero_node;
4515 TYPE_SIZE_UNIT (type) = size_zero_node;
4517 if (decl_context != PARM
4518 && (array_ptr_quals != NULL_TREE || array_parm_static))
4520 error ("static or type qualifiers in non-parameter array declarator");
4521 array_ptr_quals = NULL_TREE;
4522 array_parm_static = 0;
4525 else if (TREE_CODE (declarator) == CALL_EXPR)
4529 /* Declaring a function type.
4530 Make sure we have a valid type for the function to return. */
4531 if (type == error_mark_node)
4536 /* Warn about some types functions can't return. */
4538 if (TREE_CODE (type) == FUNCTION_TYPE)
4540 error ("`%s' declared as function returning a function", name);
4541 type = integer_type_node;
4543 if (TREE_CODE (type) == ARRAY_TYPE)
4545 error ("`%s' declared as function returning an array", name);
4546 type = integer_type_node;
4549 #ifndef TRADITIONAL_RETURN_FLOAT
4550 /* Traditionally, declaring return type float means double. */
4552 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4553 type = double_type_node;
4554 #endif /* TRADITIONAL_RETURN_FLOAT */
4556 /* Construct the function type and go to the next
4557 inner layer of declarator. */
4559 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4561 /* Say it's a definition
4562 only for the CALL_EXPR
4563 closest to the identifier. */
4564 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4565 /* Type qualifiers before the return type of the function
4566 qualify the return type, not the function type. */
4569 /* Type qualifiers on a function return type are normally
4570 permitted by the standard but have no effect, so give a
4571 warning at -W. Qualifiers on a void return type have
4572 meaning as a GNU extension, and are banned on function
4573 definitions in ISO C. FIXME: strictly we shouldn't
4574 pedwarn for qualified void return types except on function
4575 definitions, but not doing so could lead to the undesirable
4576 state of a "volatile void" function return type not being
4577 warned about, and a use of the function being compiled
4578 with GNU semantics, with no diagnostics under -pedantic. */
4579 if (VOID_TYPE_P (type) && pedantic && !in_system_header)
4580 pedwarn ("ISO C forbids qualified void function return type");
4581 else if (extra_warnings
4582 && !(VOID_TYPE_P (type)
4583 && type_quals == TYPE_QUAL_VOLATILE))
4584 warning ("type qualifiers ignored on function return type");
4586 type = c_build_qualified_type (type, type_quals);
4588 type_quals = TYPE_UNQUALIFIED;
4590 type = build_function_type (type, arg_types);
4591 declarator = TREE_OPERAND (declarator, 0);
4593 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4594 the formal parameter list of this FUNCTION_TYPE to point to
4595 the FUNCTION_TYPE node itself. */
4600 for (link = last_function_parm_tags;
4602 link = TREE_CHAIN (link))
4603 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4606 else if (TREE_CODE (declarator) == INDIRECT_REF)
4608 /* Merge any constancy or volatility into the target type
4611 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4613 pedwarn ("ISO C forbids qualified function types");
4615 type = c_build_qualified_type (type, type_quals);
4616 type_quals = TYPE_UNQUALIFIED;
4619 type = build_pointer_type (type);
4621 /* Process a list of type modifier keywords
4622 (such as const or volatile) that were given inside the `*'. */
4624 if (TREE_TYPE (declarator))
4626 register tree typemodlist;
4632 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4633 typemodlist = TREE_CHAIN (typemodlist))
4635 tree qualifier = TREE_VALUE (typemodlist);
4637 if (C_IS_RESERVED_WORD (qualifier))
4639 if (C_RID_CODE (qualifier) == RID_CONST)
4641 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4643 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4653 error ("invalid type modifier within pointer declarator");
4654 if (constp > 1 && ! flag_isoc99)
4655 pedwarn ("duplicate `const'");
4656 if (volatilep > 1 && ! flag_isoc99)
4657 pedwarn ("duplicate `volatile'");
4658 if (restrictp > 1 && ! flag_isoc99)
4659 pedwarn ("duplicate `restrict'");
4661 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4662 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4663 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4666 declarator = TREE_OPERAND (declarator, 0);
4673 /* Now TYPE has the actual type. */
4675 /* Did array size calculations overflow? */
4677 if (TREE_CODE (type) == ARRAY_TYPE
4678 && COMPLETE_TYPE_P (type)
4679 && TREE_OVERFLOW (TYPE_SIZE (type)))
4681 error ("size of array `%s' is too large", name);
4682 /* If we proceed with the array type as it is, we'll eventully
4683 crash in tree_low_cst(). */
4684 type = error_mark_node;
4687 /* If this is declaring a typedef name, return a TYPE_DECL. */
4689 if (specbits & (1 << (int) RID_TYPEDEF))
4692 /* Note that the grammar rejects storage classes
4693 in typenames, fields or parameters */
4694 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4696 pedwarn ("ISO C forbids qualified function types");
4698 type = c_build_qualified_type (type, type_quals);
4699 decl = build_decl (TYPE_DECL, declarator, type);
4700 if ((specbits & (1 << (int) RID_SIGNED))
4701 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4702 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4706 /* Detect the case of an array type of unspecified size
4707 which came, as such, direct from a typedef name.
4708 We must copy the type, so that each identifier gets
4709 a distinct type, so that each identifier's size can be
4710 controlled separately by its own initializer. */
4712 if (type != 0 && typedef_type != 0
4713 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4714 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4716 type = build_array_type (TREE_TYPE (type), 0);
4718 C_TYPE_VARIABLE_SIZE (type) = 1;
4721 /* If this is a type name (such as, in a cast or sizeof),
4722 compute the type and return it now. */
4724 if (decl_context == TYPENAME)
4726 /* Note that the grammar rejects storage classes
4727 in typenames, fields or parameters */
4728 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4730 pedwarn ("ISO C forbids const or volatile function types");
4732 type = c_build_qualified_type (type, type_quals);
4736 /* Aside from typedefs and type names (handle above),
4737 `void' at top level (not within pointer)
4738 is allowed only in public variables.
4739 We don't complain about parms either, but that is because
4740 a better error message can be made later. */
4742 if (VOID_TYPE_P (type) && decl_context != PARM
4743 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4744 && ((specbits & (1 << (int) RID_EXTERN))
4745 || (current_binding_level == global_binding_level
4747 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4749 error ("variable or field `%s' declared void", name);
4750 type = integer_type_node;
4753 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4754 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4759 if (decl_context == PARM)
4761 tree type_as_written = type;
4764 /* A parameter declared as an array of T is really a pointer to T.
4765 One declared as a function is really a pointer to a function. */
4767 if (TREE_CODE (type) == ARRAY_TYPE)
4769 /* Transfer const-ness of array into that of type pointed to. */
4770 type = TREE_TYPE (type);
4772 type = c_build_qualified_type (type, type_quals);
4773 type = build_pointer_type (type);
4774 type_quals = TYPE_UNQUALIFIED;
4775 if (array_ptr_quals)
4777 tree new_ptr_quals, new_ptr_attrs;
4779 split_specs_attrs (array_ptr_quals, &new_ptr_quals, &new_ptr_attrs);
4780 /* We don't yet implement attributes in this context. */
4781 if (new_ptr_attrs != NULL_TREE)
4782 warning ("attributes in parameter array declarator ignored");
4787 for (; new_ptr_quals; new_ptr_quals = TREE_CHAIN (new_ptr_quals))
4789 tree qualifier = TREE_VALUE (new_ptr_quals);
4791 if (C_IS_RESERVED_WORD (qualifier))
4793 if (C_RID_CODE (qualifier) == RID_CONST)
4795 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4797 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4807 error ("invalid type modifier within array declarator");
4809 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4810 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4811 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4815 else if (TREE_CODE (type) == FUNCTION_TYPE)
4817 if (pedantic && type_quals)
4818 pedwarn ("ISO C forbids qualified function types");
4820 type = c_build_qualified_type (type, type_quals);
4821 type = build_pointer_type (type);
4822 type_quals = TYPE_UNQUALIFIED;
4825 decl = build_decl (PARM_DECL, declarator, type);
4827 C_DECL_VARIABLE_SIZE (decl) = 1;
4829 /* Compute the type actually passed in the parmlist,
4830 for the case where there is no prototype.
4831 (For example, shorts and chars are passed as ints.)
4832 When there is a prototype, this is overridden later. */
4834 if (type == error_mark_node)
4835 promoted_type = type;
4838 promoted_type = simple_type_promotes_to (type);
4839 if (! promoted_type)
4840 promoted_type = type;
4843 DECL_ARG_TYPE (decl) = promoted_type;
4844 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4846 else if (decl_context == FIELD)
4848 /* Structure field. It may not be a function. */
4850 if (TREE_CODE (type) == FUNCTION_TYPE)
4852 error ("field `%s' declared as a function", name);
4853 type = build_pointer_type (type);
4855 else if (TREE_CODE (type) != ERROR_MARK
4856 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4858 error ("field `%s' has incomplete type", name);
4859 type = error_mark_node;
4861 /* Move type qualifiers down to element of an array. */
4862 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4864 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4866 TYPE_DOMAIN (type));
4868 /* Leave the field const or volatile as well. */
4869 type_quals = TYPE_UNQUALIFIED;
4872 decl = build_decl (FIELD_DECL, declarator, type);
4873 DECL_NONADDRESSABLE_P (decl) = bitfield;
4876 C_DECL_VARIABLE_SIZE (decl) = 1;
4878 else if (TREE_CODE (type) == FUNCTION_TYPE)
4880 /* Every function declaration is "external"
4881 except for those which are inside a function body
4882 in which `auto' is used.
4883 That is a case not specified by ANSI C,
4884 and we use it for forward declarations for nested functions. */
4885 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4886 || current_binding_level == global_binding_level);
4888 if (specbits & (1 << (int) RID_AUTO)
4889 && (pedantic || current_binding_level == global_binding_level))
4890 pedwarn ("invalid storage class for function `%s'", name);
4891 if (specbits & (1 << (int) RID_REGISTER))
4892 error ("invalid storage class for function `%s'", name);
4893 /* Function declaration not at top level.
4894 Storage classes other than `extern' are not allowed
4895 and `extern' makes no difference. */
4896 if (current_binding_level != global_binding_level
4897 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4899 pedwarn ("invalid storage class for function `%s'", name);
4901 decl = build_decl (FUNCTION_DECL, declarator, type);
4902 decl = build_decl_attribute_variant (decl, decl_machine_attr);
4904 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4905 pedwarn ("ISO C forbids qualified function types");
4907 /* GNU C interprets a `volatile void' return type to indicate
4908 that the function does not return. */
4909 if ((type_quals & TYPE_QUAL_VOLATILE)
4910 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4911 warning ("`noreturn' function returns non-void value");
4914 DECL_EXTERNAL (decl) = 1;
4915 /* Record absence of global scope for `static' or `auto'. */
4917 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4919 /* Record presence of `inline', if it is reasonable. */
4922 if (MAIN_NAME_P (declarator))
4923 warning ("cannot inline function `main'");
4925 /* Assume that otherwise the function can be inlined. */
4926 DECL_INLINE (decl) = 1;
4928 if (specbits & (1 << (int) RID_EXTERN))
4929 current_extern_inline = 1;
4934 /* It's a variable. */
4935 /* An uninitialized decl with `extern' is a reference. */
4936 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4938 /* Move type qualifiers down to element of an array. */
4939 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4941 int saved_align = TYPE_ALIGN(type);
4942 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4944 TYPE_DOMAIN (type));
4945 TYPE_ALIGN (type) = saved_align;
4946 #if 0 /* Leave the variable const or volatile as well. */
4947 type_quals = TYPE_UNQUALIFIED;
4951 decl = build_decl (VAR_DECL, declarator, type);
4953 C_DECL_VARIABLE_SIZE (decl) = 1;
4956 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4958 DECL_EXTERNAL (decl) = extern_ref;
4959 /* At top level, the presence of a `static' or `register' storage
4960 class specifier, or the absence of all storage class specifiers
4961 makes this declaration a definition (perhaps tentative). Also,
4962 the absence of both `static' and `register' makes it public. */
4963 if (current_binding_level == global_binding_level)
4967 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
4968 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
4970 /* Not at top level, only `static' makes a static definition. */
4973 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4974 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
4978 /* Record `register' declaration for warnings on &
4979 and in case doing stupid register allocation. */
4981 if (specbits & (1 << (int) RID_REGISTER))
4982 DECL_REGISTER (decl) = 1;
4984 /* Record constancy and volatility. */
4985 c_apply_type_quals_to_decl (type_quals, decl);
4987 /* If a type has volatile components, it should be stored in memory.
4988 Otherwise, the fact that those components are volatile
4989 will be ignored, and would even crash the compiler. */
4990 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4991 mark_addressable (decl);
4997 /* Decode the parameter-list info for a function type or function definition.
4998 The argument is the value returned by `get_parm_info' (or made in parse.y
4999 if there is an identifier list instead of a parameter decl list).
5000 These two functions are separate because when a function returns
5001 or receives functions then each is called multiple times but the order
5002 of calls is different. The last call to `grokparms' is always the one
5003 that contains the formal parameter names of a function definition.
5005 Store in `last_function_parms' a chain of the decls of parms.
5006 Also store in `last_function_parm_tags' a chain of the struct, union,
5007 and enum tags declared among the parms.
5009 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5011 FUNCDEF_FLAG is nonzero for a function definition, 0 for
5012 a mere declaration. A nonempty identifier-list gets an error message
5013 when FUNCDEF_FLAG is zero. */
5016 grokparms (parms_info, funcdef_flag)
5020 tree first_parm = TREE_CHAIN (parms_info);
5022 last_function_parms = TREE_PURPOSE (parms_info);
5023 last_function_parm_tags = TREE_VALUE (parms_info);
5025 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
5026 && !in_system_header)
5027 warning ("function declaration isn't a prototype");
5030 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
5033 pedwarn ("parameter names (without types) in function declaration");
5035 last_function_parms = first_parm;
5042 /* We no longer test FUNCDEF_FLAG.
5043 If the arg types are incomplete in a declaration,
5044 they must include undefined tags.
5045 These tags can never be defined in the scope of the declaration,
5046 so the types can never be completed,
5047 and no call can be compiled successfully. */
5049 /* In a fcn definition, arg types must be complete. */
5052 for (parm = last_function_parms, typelt = first_parm;
5054 parm = TREE_CHAIN (parm))
5055 /* Skip over any enumeration constants declared here. */
5056 if (TREE_CODE (parm) == PARM_DECL)
5058 /* Barf if the parameter itself has an incomplete type. */
5059 tree type = TREE_VALUE (typelt);
5060 if (type == error_mark_node)
5062 if (!COMPLETE_TYPE_P (type))
5064 if (funcdef_flag && DECL_NAME (parm) != 0)
5065 error ("parameter `%s' has incomplete type",
5066 IDENTIFIER_POINTER (DECL_NAME (parm)));
5068 warning ("parameter has incomplete type");
5071 TREE_VALUE (typelt) = error_mark_node;
5072 TREE_TYPE (parm) = error_mark_node;
5076 /* This has been replaced by parm_tags_warning, which
5077 uses a more accurate criterion for what to warn
5081 /* Now warn if is a pointer to an incomplete type. */
5082 while (TREE_CODE (type) == POINTER_TYPE
5083 || TREE_CODE (type) == REFERENCE_TYPE)
5084 type = TREE_TYPE (type);
5085 type = TYPE_MAIN_VARIANT (type);
5086 if (!COMPLETE_TYPE_P (type))
5088 if (DECL_NAME (parm) != 0)
5089 warning ("parameter `%s' points to incomplete type",
5090 IDENTIFIER_POINTER (DECL_NAME (parm)));
5092 warning ("parameter points to incomplete type");
5096 typelt = TREE_CHAIN (typelt);
5103 /* Return a tree_list node with info on a parameter list just parsed.
5104 The TREE_PURPOSE is a chain of decls of those parms.
5105 The TREE_VALUE is a list of structure, union and enum tags defined.
5106 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5107 This tree_list node is later fed to `grokparms'.
5109 VOID_AT_END nonzero means append `void' to the end of the type-list.
5110 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5113 get_parm_info (void_at_end)
5116 register tree decl, t;
5117 register tree types = 0;
5119 tree tags = gettags ();
5120 tree parms = getdecls ();
5122 tree order = current_binding_level->parm_order;
5124 /* Just `void' (and no ellipsis) is special. There are really no parms.
5125 But if the `void' is qualified (by `const' or `volatile') or has a
5126 storage class specifier (`register'), then the behavior is undefined;
5127 by not counting it as the special case of `void' we will cause an
5128 error later. Typedefs for `void' are OK (see DR#157). */
5129 if (void_at_end && parms != 0
5130 && TREE_CHAIN (parms) == 0
5131 && VOID_TYPE_P (TREE_TYPE (parms))
5132 && ! TREE_THIS_VOLATILE (parms)
5133 && ! TREE_READONLY (parms)
5134 && ! DECL_REGISTER (parms)
5135 && DECL_NAME (parms) == 0)
5138 storedecls (NULL_TREE);
5139 return tree_cons (NULL_TREE, NULL_TREE,
5140 tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5143 /* Extract enumerator values and other non-parms declared with the parms.
5144 Likewise any forward parm decls that didn't have real parm decls. */
5145 for (decl = parms; decl;)
5147 tree next = TREE_CHAIN (decl);
5149 if (TREE_CODE (decl) != PARM_DECL)
5151 TREE_CHAIN (decl) = new_parms;
5154 else if (TREE_ASM_WRITTEN (decl))
5156 error_with_decl (decl,
5157 "parameter `%s' has just a forward declaration");
5158 TREE_CHAIN (decl) = new_parms;
5164 /* Put the parm decls back in the order they were in in the parm list. */
5165 for (t = order; t; t = TREE_CHAIN (t))
5168 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5170 TREE_CHAIN (TREE_VALUE (t)) = 0;
5173 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5176 /* Store the parmlist in the binding level since the old one
5177 is no longer a valid list. (We have changed the chain pointers.) */
5178 storedecls (new_parms);
5180 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5181 /* There may also be declarations for enumerators if an enumeration
5182 type is declared among the parms. Ignore them here. */
5183 if (TREE_CODE (decl) == PARM_DECL)
5185 /* Since there is a prototype,
5186 args are passed in their declared types. */
5187 tree type = TREE_TYPE (decl);
5188 DECL_ARG_TYPE (decl) = type;
5189 if (PROMOTE_PROTOTYPES
5190 && (TREE_CODE (type) == INTEGER_TYPE
5191 || TREE_CODE (type) == ENUMERAL_TYPE)
5192 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5193 DECL_ARG_TYPE (decl) = integer_type_node;
5195 types = tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5196 if (VOID_TYPE_P (TREE_VALUE (types)) && ! erred
5197 && DECL_NAME (decl) == 0)
5199 error ("`void' in parameter list must be the entire list");
5205 return tree_cons (new_parms, tags,
5206 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
5208 return tree_cons (new_parms, tags, nreverse (types));
5211 /* At end of parameter list, warn about any struct, union or enum tags
5212 defined within. Do so because these types cannot ever become complete. */
5215 parmlist_tags_warning ()
5220 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5222 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5223 /* An anonymous union parm type is meaningful as a GNU extension.
5224 So don't warn for that. */
5225 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5227 if (TREE_PURPOSE (elt) != 0)
5228 warning ("`%s %s' declared inside parameter list",
5229 (code == RECORD_TYPE ? "struct"
5230 : code == UNION_TYPE ? "union"
5232 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5235 /* For translation these need to be seperate warnings */
5236 if (code == RECORD_TYPE)
5237 warning ("anonymous struct declared inside parameter list");
5238 else if (code == UNION_TYPE)
5239 warning ("anonymous union declared inside parameter list");
5241 warning ("anonymous enum declared inside parameter list");
5245 warning ("its scope is only this definition or declaration, which is probably not what you want.");
5251 /* Get the struct, enum or union (CODE says which) with tag NAME.
5252 Define the tag as a forward-reference if it is not defined. */
5255 xref_tag (code, name)
5256 enum tree_code code;
5259 /* If a cross reference is requested, look up the type
5260 already defined for this tag and return it. */
5262 register tree ref = lookup_tag (code, name, current_binding_level, 0);
5263 /* Even if this is the wrong type of tag, return what we found.
5264 There will be an error message anyway, from pending_xref_error.
5265 If we create an empty xref just for an invalid use of the type,
5266 the main result is to create lots of superfluous error messages. */
5270 /* If no such tag is yet defined, create a forward-reference node
5271 and record it as the "definition".
5272 When a real declaration of this type is found,
5273 the forward-reference will be altered into a real type. */
5275 ref = make_node (code);
5276 if (code == ENUMERAL_TYPE)
5278 /* Give the type a default layout like unsigned int
5279 to avoid crashing if it does not get defined. */
5280 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5281 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5282 TYPE_USER_ALIGN (ref) = 0;
5283 TREE_UNSIGNED (ref) = 1;
5284 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5285 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5286 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5289 pushtag (name, ref);
5294 /* Make sure that the tag NAME is defined *in the current binding level*
5295 at least as a forward reference.
5296 CODE says which kind of tag NAME ought to be. */
5299 start_struct (code, name)
5300 enum tree_code code;
5303 /* If there is already a tag defined at this binding level
5304 (as a forward reference), just return it. */
5306 register tree ref = 0;
5309 ref = lookup_tag (code, name, current_binding_level, 1);
5310 if (ref && TREE_CODE (ref) == code)
5312 C_TYPE_BEING_DEFINED (ref) = 1;
5313 TYPE_PACKED (ref) = flag_pack_struct;
5314 if (TYPE_FIELDS (ref))
5315 error ("redefinition of `%s %s'",
5316 code == UNION_TYPE ? "union" : "struct",
5317 IDENTIFIER_POINTER (name));
5322 /* Otherwise create a forward-reference just so the tag is in scope. */
5324 ref = make_node (code);
5325 pushtag (name, ref);
5326 C_TYPE_BEING_DEFINED (ref) = 1;
5327 TYPE_PACKED (ref) = flag_pack_struct;
5331 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5332 of a structure component, returning a FIELD_DECL node.
5333 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5335 This is done during the parsing of the struct declaration.
5336 The FIELD_DECL nodes are chained together and the lot of them
5337 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5340 grokfield (filename, line, declarator, declspecs, width)
5341 const char *filename ATTRIBUTE_UNUSED;
5342 int line ATTRIBUTE_UNUSED;
5343 tree declarator, declspecs, width;
5347 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5349 finish_decl (value, NULL_TREE, NULL_TREE);
5350 DECL_INITIAL (value) = width;
5352 maybe_objc_check_decl (value);
5356 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5357 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5358 ATTRIBUTES are attributes to be applied to the structure. */
5361 finish_struct (t, fieldlist, attributes)
5367 int toplevel = global_binding_level == current_binding_level;
5368 int saw_named_field;
5370 /* If this type was previously laid out as a forward reference,
5371 make sure we lay it out again. */
5375 decl_attributes (t, attributes, NULL_TREE);
5377 /* Nameless union parm types are useful as GCC extension. */
5378 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5379 /* Otherwise, warn about any struct or union def. in parmlist. */
5380 if (in_parm_level_p ())
5383 pedwarn ("%s defined inside parms",
5384 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5385 else if (! flag_traditional)
5386 warning ("%s defined inside parms",
5387 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5392 for (x = fieldlist; x; x = TREE_CHAIN (x))
5393 if (DECL_NAME (x) != 0)
5397 pedwarn ("%s has no %s",
5398 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
5399 fieldlist ? _("named members") : _("members"));
5402 /* Install struct as DECL_CONTEXT of each field decl.
5403 Also process specified field sizes,m which is found in the DECL_INITIAL.
5404 Store 0 there, except for ": 0" fields (so we can find them
5405 and delete them, below). */
5407 saw_named_field = 0;
5408 for (x = fieldlist; x; x = TREE_CHAIN (x))
5410 DECL_CONTEXT (x) = t;
5411 DECL_PACKED (x) |= TYPE_PACKED (t);
5413 /* If any field is const, the structure type is pseudo-const. */
5414 if (TREE_READONLY (x))
5415 C_TYPE_FIELDS_READONLY (t) = 1;
5418 /* A field that is pseudo-const makes the structure likewise. */
5419 tree t1 = TREE_TYPE (x);
5420 while (TREE_CODE (t1) == ARRAY_TYPE)
5421 t1 = TREE_TYPE (t1);
5422 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5423 && C_TYPE_FIELDS_READONLY (t1))
5424 C_TYPE_FIELDS_READONLY (t) = 1;
5427 /* Any field that is volatile means variables of this type must be
5428 treated in some ways as volatile. */
5429 if (TREE_THIS_VOLATILE (x))
5430 C_TYPE_FIELDS_VOLATILE (t) = 1;
5432 /* Any field of nominal variable size implies structure is too. */
5433 if (C_DECL_VARIABLE_SIZE (x))
5434 C_TYPE_VARIABLE_SIZE (t) = 1;
5436 /* Detect invalid nested redefinition. */
5437 if (TREE_TYPE (x) == t)
5438 error ("nested redefinition of `%s'",
5439 IDENTIFIER_POINTER (TYPE_NAME (t)));
5441 /* Detect invalid bit-field size. */
5442 if (DECL_INITIAL (x))
5443 STRIP_NOPS (DECL_INITIAL (x));
5444 if (DECL_INITIAL (x))
5446 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5447 constant_expression_warning (DECL_INITIAL (x));
5451 "bit-field `%s' width not an integer constant");
5452 DECL_INITIAL (x) = NULL;
5456 /* Detect invalid bit-field type. */
5457 if (DECL_INITIAL (x)
5458 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5459 && TREE_CODE (TREE_TYPE (x)) != BOOLEAN_TYPE
5460 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5462 error_with_decl (x, "bit-field `%s' has invalid type");
5463 DECL_INITIAL (x) = NULL;
5466 if (DECL_INITIAL (x) && pedantic
5467 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5468 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5469 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != c_bool_type_node
5470 /* Accept an enum that's equivalent to int or unsigned int. */
5471 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5472 && (TYPE_PRECISION (TREE_TYPE (x))
5473 == TYPE_PRECISION (integer_type_node))))
5474 pedwarn_with_decl (x, "bit-field `%s' type invalid in ISO C");
5476 /* Detect and ignore out of range field width and process valid
5478 if (DECL_INITIAL (x))
5481 if (TYPE_MAIN_VARIANT (TREE_TYPE (x)) == c_bool_type_node)
5482 max_width = CHAR_TYPE_SIZE;
5484 max_width = TYPE_PRECISION (TREE_TYPE (x));
5485 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5486 error_with_decl (x, "negative width in bit-field `%s'");
5487 else if (0 < compare_tree_int (DECL_INITIAL (x), max_width))
5488 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5489 else if (integer_zerop (DECL_INITIAL (x)) && DECL_NAME (x) != 0)
5490 error_with_decl (x, "zero width for bit-field `%s'");
5493 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
5494 unsigned HOST_WIDE_INT width
5495 = TREE_INT_CST_LOW (DECL_INITIAL (x));
5497 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5498 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5499 TREE_UNSIGNED (TREE_TYPE (x)))
5501 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5502 TREE_UNSIGNED (TREE_TYPE (x))))))
5503 warning_with_decl (x,
5504 "`%s' is narrower than values of its type");
5506 DECL_SIZE (x) = bitsize_int (width);
5507 DECL_BIT_FIELD (x) = 1;
5508 SET_DECL_C_BIT_FIELD (x);
5512 /* field size 0 => force desired amount of alignment. */
5513 #ifdef EMPTY_FIELD_BOUNDARY
5514 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5516 #ifdef PCC_BITFIELD_TYPE_MATTERS
5517 if (PCC_BITFIELD_TYPE_MATTERS)
5519 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5520 TYPE_ALIGN (TREE_TYPE (x)));
5521 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5528 else if (TREE_TYPE (x) != error_mark_node)
5530 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5531 : TYPE_ALIGN (TREE_TYPE (x)));
5533 /* Non-bit-fields are aligned for their type, except packed
5534 fields which require only BITS_PER_UNIT alignment. */
5535 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5536 if (! DECL_PACKED (x))
5537 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5540 DECL_INITIAL (x) = 0;
5542 /* Detect flexible array member in an invalid context. */
5543 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5544 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5545 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5546 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5548 if (TREE_CODE (t) == UNION_TYPE)
5549 error_with_decl (x, "flexible array member in union");
5550 else if (TREE_CHAIN (x) != NULL_TREE)
5551 error_with_decl (x, "flexible array member not at end of struct");
5552 else if (! saw_named_field)
5553 error_with_decl (x, "flexible array member in otherwise empty struct");
5556 saw_named_field = 1;
5559 /* Delete all duplicate fields from the fieldlist */
5560 for (x = fieldlist; x && TREE_CHAIN (x);)
5561 /* Anonymous fields aren't duplicates. */
5562 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5566 register tree y = fieldlist;
5570 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5576 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5578 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5579 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5585 /* Now we have the nearly final fieldlist. Record it,
5586 then lay out the structure or union (including the fields). */
5588 TYPE_FIELDS (t) = fieldlist;
5592 /* Delete all zero-width bit-fields from the fieldlist */
5594 tree *fieldlistp = &fieldlist;
5596 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5597 *fieldlistp = TREE_CHAIN (*fieldlistp);
5599 fieldlistp = &TREE_CHAIN (*fieldlistp);
5602 /* Now we have the truly final field list.
5603 Store it in this type and in the variants. */
5605 TYPE_FIELDS (t) = fieldlist;
5607 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5609 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5610 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5611 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5612 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5615 /* If this was supposed to be a transparent union, but we can't
5616 make it one, warn and turn off the flag. */
5617 if (TREE_CODE (t) == UNION_TYPE
5618 && TYPE_TRANSPARENT_UNION (t)
5619 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5621 TYPE_TRANSPARENT_UNION (t) = 0;
5622 warning ("union cannot be made transparent");
5625 /* If this structure or union completes the type of any previous
5626 variable declaration, lay it out and output its rtl. */
5628 if (current_binding_level->n_incomplete != 0)
5631 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5633 if (TYPE_MAIN_VARIANT (TREE_TYPE (decl)) == TYPE_MAIN_VARIANT (t)
5634 && TREE_CODE (decl) != TYPE_DECL)
5636 layout_decl (decl, 0);
5637 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5638 maybe_objc_check_decl (decl);
5639 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5642 --current_binding_level->n_incomplete;
5644 else if (!COMPLETE_TYPE_P (TREE_TYPE (decl))
5645 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5647 tree element = TREE_TYPE (decl);
5648 while (TREE_CODE (element) == ARRAY_TYPE)
5649 element = TREE_TYPE (element);
5651 layout_array_type (TREE_TYPE (decl));
5656 /* Finish debugging output for this type. */
5657 rest_of_type_compilation (t, toplevel);
5662 /* Lay out the type T, and its element type, and so on. */
5665 layout_array_type (t)
5668 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5669 layout_array_type (TREE_TYPE (t));
5673 /* Begin compiling the definition of an enumeration type.
5674 NAME is its name (or null if anonymous).
5675 Returns the type object, as yet incomplete.
5676 Also records info about it so that build_enumerator
5677 may be used to declare the individual values as they are read. */
5683 register tree enumtype = 0;
5685 /* If this is the real definition for a previous forward reference,
5686 fill in the contents in the same object that used to be the
5687 forward reference. */
5690 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5692 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5694 enumtype = make_node (ENUMERAL_TYPE);
5695 pushtag (name, enumtype);
5698 C_TYPE_BEING_DEFINED (enumtype) = 1;
5700 if (TYPE_VALUES (enumtype) != 0)
5702 /* This enum is a named one that has been declared already. */
5703 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5705 /* Completely replace its old definition.
5706 The old enumerators remain defined, however. */
5707 TYPE_VALUES (enumtype) = 0;
5710 enum_next_value = integer_zero_node;
5713 if (flag_short_enums)
5714 TYPE_PACKED (enumtype) = 1;
5719 /* After processing and defining all the values of an enumeration type,
5720 install their decls in the enumeration type and finish it off.
5721 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5722 and ATTRIBUTES are the specified attributes.
5723 Returns ENUMTYPE. */
5726 finish_enum (enumtype, values, attributes)
5731 register tree pair, tem;
5732 tree minnode = 0, maxnode = 0, enum_value_type;
5733 int precision, unsign;
5734 int toplevel = (global_binding_level == current_binding_level);
5736 if (in_parm_level_p ())
5737 warning ("enum defined inside parms");
5739 decl_attributes (enumtype, attributes, NULL_TREE);
5741 /* Calculate the maximum value of any enumerator in this type. */
5743 if (values == error_mark_node)
5744 minnode = maxnode = integer_zero_node;
5747 minnode = maxnode = TREE_VALUE (values);
5748 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5750 tree value = TREE_VALUE (pair);
5751 if (tree_int_cst_lt (maxnode, value))
5753 if (tree_int_cst_lt (value, minnode))
5758 /* Construct the final type of this enumeration. It is the same
5759 as one of the integral types - the narrowest one that fits, except
5760 that normally we only go as narrow as int - and signed iff any of
5761 the values are negative. */
5762 unsign = (tree_int_cst_sgn (minnode) >= 0);
5763 precision = MAX (min_precision (minnode, unsign),
5764 min_precision (maxnode, unsign));
5765 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5767 tree narrowest = type_for_size (precision, unsign);
5770 warning ("enumeration values exceed range of largest integer");
5771 narrowest = long_long_integer_type_node;
5774 precision = TYPE_PRECISION (narrowest);
5777 precision = TYPE_PRECISION (integer_type_node);
5779 if (precision == TYPE_PRECISION (integer_type_node))
5780 enum_value_type = type_for_size (precision, 0);
5782 enum_value_type = enumtype;
5784 TYPE_MIN_VALUE (enumtype) = minnode;
5785 TYPE_MAX_VALUE (enumtype) = maxnode;
5786 TYPE_PRECISION (enumtype) = precision;
5787 TREE_UNSIGNED (enumtype) = unsign;
5788 TYPE_SIZE (enumtype) = 0;
5789 layout_type (enumtype);
5791 if (values != error_mark_node)
5793 /* Change the type of the enumerators to be the enum type. We
5794 need to do this irrespective of the size of the enum, for
5795 proper type checking. Replace the DECL_INITIALs of the
5796 enumerators, and the value slots of the list, with copies
5797 that have the enum type; they cannot be modified in place
5798 because they may be shared (e.g. integer_zero_node) Finally,
5799 change the purpose slots to point to the names of the decls. */
5800 for (pair = values; pair; pair = TREE_CHAIN (pair))
5802 tree enu = TREE_PURPOSE (pair);
5804 TREE_TYPE (enu) = enumtype;
5805 DECL_SIZE (enu) = TYPE_SIZE (enumtype);
5806 DECL_SIZE_UNIT (enu) = TYPE_SIZE_UNIT (enumtype);
5807 DECL_ALIGN (enu) = TYPE_ALIGN (enumtype);
5808 DECL_USER_ALIGN (enu) = TYPE_USER_ALIGN (enumtype);
5809 DECL_MODE (enu) = TYPE_MODE (enumtype);
5811 /* The ISO C Standard mandates enumerators to have type int,
5812 even though the underlying type of an enum type is
5813 unspecified. Here we convert any enumerators that fit in
5814 an int to type int, to avoid promotions to unsigned types
5815 when comparing integers with enumerators that fit in the
5816 int range. When -pedantic is given, build_enumerator()
5817 would have already taken care of those that don't fit. */
5818 if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
5819 DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
5821 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5823 TREE_PURPOSE (pair) = DECL_NAME (enu);
5824 TREE_VALUE (pair) = DECL_INITIAL (enu);
5827 TYPE_VALUES (enumtype) = values;
5830 /* Fix up all variant types of this enum type. */
5831 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5833 if (tem == enumtype)
5835 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5836 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5837 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5838 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5839 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5840 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5841 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5842 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5843 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5844 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5847 /* Finish debugging output for this type. */
5848 rest_of_type_compilation (enumtype, toplevel);
5853 /* Build and install a CONST_DECL for one value of the
5854 current enumeration type (one that was begun with start_enum).
5855 Return a tree-list containing the CONST_DECL and its value.
5856 Assignment of sequential values by default is handled here. */
5859 build_enumerator (name, value)
5862 register tree decl, type;
5864 /* Validate and default VALUE. */
5866 /* Remove no-op casts from the value. */
5868 STRIP_TYPE_NOPS (value);
5872 if (TREE_CODE (value) == INTEGER_CST)
5874 value = default_conversion (value);
5875 constant_expression_warning (value);
5879 error ("enumerator value for `%s' not integer constant",
5880 IDENTIFIER_POINTER (name));
5885 /* Default based on previous value. */
5886 /* It should no longer be possible to have NON_LVALUE_EXPR
5890 value = enum_next_value;
5892 error ("overflow in enumeration values");
5895 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5897 pedwarn ("ISO C restricts enumerator values to range of `int'");
5898 value = convert (integer_type_node, value);
5901 /* Set basis for default for next value. */
5902 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5903 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5905 /* Now create a declaration for the enum value name. */
5907 type = TREE_TYPE (value);
5908 type = type_for_size (MAX (TYPE_PRECISION (type),
5909 TYPE_PRECISION (integer_type_node)),
5911 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
5912 && TREE_UNSIGNED (type)));
5914 decl = build_decl (CONST_DECL, name, type);
5915 DECL_INITIAL (decl) = convert (type, value);
5918 return tree_cons (decl, value, NULL_TREE);
5922 /* Create the FUNCTION_DECL for a function definition.
5923 DECLSPECS, DECLARATOR, PREFIX_ATTRIBUTES and ATTRIBUTES are the parts of
5924 the declaration; they describe the function's name and the type it returns,
5925 but twisted together in a fashion that parallels the syntax of C.
5927 This function creates a binding context for the function body
5928 as well as setting up the FUNCTION_DECL in current_function_decl.
5930 Returns 1 on success. If the DECLARATOR is not suitable for a function
5931 (it defines a datum instead), we return 0, which tells
5932 yyparse to report a parse error. */
5935 start_function (declspecs, declarator, prefix_attributes, attributes)
5936 tree declarator, declspecs, prefix_attributes, attributes;
5938 tree decl1, old_decl;
5940 int old_immediate_size_expand = immediate_size_expand;
5942 current_function_returns_value = 0; /* Assume, until we see it does. */
5943 current_function_returns_null = 0;
5944 warn_about_return_type = 0;
5945 current_extern_inline = 0;
5946 c_function_varargs = 0;
5948 shadowed_labels = 0;
5950 /* Don't expand any sizes in the return type of the function. */
5951 immediate_size_expand = 0;
5953 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
5955 /* If the declarator is not suitable for a function definition,
5956 cause a syntax error. */
5959 immediate_size_expand = old_immediate_size_expand;
5963 decl_attributes (decl1, prefix_attributes, attributes);
5965 announce_function (decl1);
5967 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5969 error ("return type is an incomplete type");
5970 /* Make it return void instead. */
5972 = build_function_type (void_type_node,
5973 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5976 if (warn_about_return_type)
5977 pedwarn_c99 ("return type defaults to `int'");
5979 /* Save the parm names or decls from this function's declarator
5980 where store_parm_decls will find them. */
5981 current_function_parms = last_function_parms;
5982 current_function_parm_tags = last_function_parm_tags;
5984 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5985 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5986 DECL_INITIAL (decl1) = error_mark_node;
5988 /* If this definition isn't a prototype and we had a prototype declaration
5989 before, copy the arg type info from that prototype.
5990 But not if what we had before was a builtin function. */
5991 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5992 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5993 && !DECL_BUILT_IN (old_decl)
5994 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5995 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5996 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5998 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5999 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
6000 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
6003 /* If there is no explicit declaration, look for any out-of-scope implicit
6006 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
6008 /* Optionally warn of old-fashioned def with no previous prototype. */
6009 if (warn_strict_prototypes
6010 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6012 && (TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0
6013 || (DECL_BUILT_IN (old_decl)
6014 && ! C_DECL_ANTICIPATED (old_decl)))))
6015 warning ("function declaration isn't a prototype");
6016 /* Optionally warn of any global def with no previous prototype. */
6017 else if (warn_missing_prototypes
6018 && TREE_PUBLIC (decl1)
6020 && (TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0
6021 || (DECL_BUILT_IN (old_decl)
6022 && ! C_DECL_ANTICIPATED (old_decl))))
6023 && ! MAIN_NAME_P (DECL_NAME (decl1)))
6024 warning_with_decl (decl1, "no previous prototype for `%s'");
6025 /* Optionally warn of any def with no previous prototype
6026 if the function has already been used. */
6027 else if (warn_missing_prototypes
6028 && old_decl != 0 && TREE_USED (old_decl)
6029 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6030 warning_with_decl (decl1,
6031 "`%s' was used with no prototype before its definition");
6032 /* Optionally warn of any global def with no previous declaration. */
6033 else if (warn_missing_declarations
6034 && TREE_PUBLIC (decl1)
6036 && ! MAIN_NAME_P (DECL_NAME (decl1)))
6037 warning_with_decl (decl1, "no previous declaration for `%s'");
6038 /* Optionally warn of any def with no previous declaration
6039 if the function has already been used. */
6040 else if (warn_missing_declarations
6041 && old_decl != 0 && TREE_USED (old_decl)
6042 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
6043 warning_with_decl (decl1,
6044 "`%s' was used with no declaration before its definition");
6046 /* This is a definition, not a reference.
6047 So normally clear DECL_EXTERNAL.
6048 However, `extern inline' acts like a declaration
6049 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6050 DECL_EXTERNAL (decl1) = current_extern_inline;
6052 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
6053 SET_DEFAULT_DECL_ATTRIBUTES (decl1, attributes);
6056 /* This function exists in static storage.
6057 (This does not mean `static' in the C sense!) */
6058 TREE_STATIC (decl1) = 1;
6060 /* A nested function is not global. */
6061 if (current_function_decl != 0)
6062 TREE_PUBLIC (decl1) = 0;
6064 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6065 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
6070 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6071 != integer_type_node)
6072 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
6074 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
6075 args = TREE_CHAIN (args))
6077 tree type = args ? TREE_VALUE (args) : 0;
6079 if (type == void_type_node)
6086 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6087 pedwarn_with_decl (decl1,
6088 "first argument of `%s' should be `int'");
6092 if (TREE_CODE (type) != POINTER_TYPE
6093 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6094 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6096 pedwarn_with_decl (decl1,
6097 "second argument of `%s' should be `char **'");
6101 if (TREE_CODE (type) != POINTER_TYPE
6102 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6103 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6105 pedwarn_with_decl (decl1,
6106 "third argument of `%s' should probably be `char **'");
6111 /* It is intentional that this message does not mention the third
6112 argument because it's only mentioned in an appendix of the
6114 if (argct > 0 && (argct < 2 || argct > 3))
6115 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
6117 if (! TREE_PUBLIC (decl1))
6118 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
6121 /* Record the decl so that the function name is defined.
6122 If we already have a decl for this name, and it is a FUNCTION_DECL,
6123 use the old decl. */
6125 current_function_decl = pushdecl (decl1);
6128 declare_parm_level (1);
6129 current_binding_level->subblocks_tag_transparent = 1;
6131 make_decl_rtl (current_function_decl, NULL);
6133 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6134 /* Promote the value to int before returning it. */
6135 if (c_promoting_integer_type_p (restype))
6137 /* It retains unsignedness if traditional
6138 or if not really getting wider. */
6139 if (TREE_UNSIGNED (restype)
6140 && (flag_traditional
6141 || (TYPE_PRECISION (restype)
6142 == TYPE_PRECISION (integer_type_node))))
6143 restype = unsigned_type_node;
6145 restype = integer_type_node;
6147 DECL_RESULT (current_function_decl)
6148 = build_decl (RESULT_DECL, NULL_TREE, restype);
6150 /* If this fcn was already referenced via a block-scope `extern' decl
6151 (or an implicit decl), propagate certain information about the usage. */
6152 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6153 TREE_ADDRESSABLE (current_function_decl) = 1;
6155 immediate_size_expand = old_immediate_size_expand;
6157 start_fname_decls ();
6162 /* Record that this function is going to be a varargs function.
6163 This is called before store_parm_decls, which is too early
6164 to call mark_varargs directly. */
6169 c_function_varargs = 1;
6172 /* Store the parameter declarations into the current function declaration.
6173 This is called after parsing the parameter declarations, before
6174 digesting the body of the function.
6176 For an old-style definition, modify the function's type
6177 to specify at least the number of arguments. */
6182 register tree fndecl = current_function_decl;
6185 /* This is either a chain of PARM_DECLs (if a prototype was used)
6186 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6187 tree specparms = current_function_parms;
6189 /* This is a list of types declared among parms in a prototype. */
6190 tree parmtags = current_function_parm_tags;
6192 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6193 register tree parmdecls = getdecls ();
6195 /* This is a chain of any other decls that came in among the parm
6196 declarations. If a parm is declared with enum {foo, bar} x;
6197 then CONST_DECLs for foo and bar are put here. */
6200 /* Nonzero if this definition is written with a prototype. */
6203 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6205 /* This case is when the function was defined with an ANSI prototype.
6206 The parms already have decls, so we need not do anything here
6207 except record them as in effect
6208 and complain if any redundant old-style parm decls were written. */
6219 error_with_decl (fndecl,
6220 "parm types given both in parmlist and separately");
6221 /* Get rid of the erroneous decls; don't keep them on
6222 the list of parms, since they might not be PARM_DECLs. */
6223 for (decl = current_binding_level->names;
6224 decl; decl = TREE_CHAIN (decl))
6225 if (DECL_NAME (decl))
6226 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6227 for (link = current_binding_level->shadowed;
6228 link; link = TREE_CHAIN (link))
6229 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6230 current_binding_level->names = 0;
6231 current_binding_level->shadowed = 0;
6234 specparms = nreverse (specparms);
6235 for (parm = specparms; parm; parm = next)
6237 next = TREE_CHAIN (parm);
6238 if (TREE_CODE (parm) == PARM_DECL)
6240 if (DECL_NAME (parm) == 0)
6241 error_with_decl (parm, "parameter name omitted");
6242 else if (TREE_CODE (TREE_TYPE (parm)) != ERROR_MARK
6243 && VOID_TYPE_P (TREE_TYPE (parm)))
6245 error_with_decl (parm, "parameter `%s' declared void");
6246 /* Change the type to error_mark_node so this parameter
6247 will be ignored by assign_parms. */
6248 TREE_TYPE (parm) = error_mark_node;
6254 /* If we find an enum constant or a type tag,
6255 put it aside for the moment. */
6256 TREE_CHAIN (parm) = 0;
6257 others = chainon (others, parm);
6261 /* Get the decls in their original chain order
6262 and record in the function. */
6263 DECL_ARGUMENTS (fndecl) = getdecls ();
6266 /* If this function takes a variable number of arguments,
6267 add a phony parameter to the end of the parm list,
6268 to represent the position of the first unnamed argument. */
6269 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6272 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6273 /* Let's hope the address of the unnamed parm
6274 won't depend on its type. */
6275 TREE_TYPE (dummy) = integer_type_node;
6276 DECL_ARG_TYPE (dummy) = integer_type_node;
6277 DECL_ARGUMENTS (fndecl) = chainon (DECL_ARGUMENTS (fndecl), dummy);
6281 /* Now pushdecl the enum constants. */
6282 for (parm = others; parm; parm = next)
6284 next = TREE_CHAIN (parm);
6285 if (DECL_NAME (parm) == 0)
6287 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6289 else if (TREE_CODE (parm) != PARM_DECL)
6293 storetags (chainon (parmtags, gettags ()));
6297 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6298 each with a parm name as the TREE_VALUE.
6300 PARMDECLS is a chain of declarations for parameters.
6301 Warning! It can also contain CONST_DECLs which are not parameters
6302 but are names of enumerators of any enum types
6303 declared among the parameters.
6305 First match each formal parameter name with its declaration.
6306 Associate decls with the names and store the decls
6307 into the TREE_PURPOSE slots. */
6309 /* We use DECL_WEAK as a flag to show which parameters have been
6310 seen already since it is not used on PARM_DECL or CONST_DECL. */
6311 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6312 DECL_WEAK (parm) = 0;
6314 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6316 register tree tail, found = NULL;
6318 if (TREE_VALUE (parm) == 0)
6320 error_with_decl (fndecl,
6321 "parameter name missing from parameter list");
6322 TREE_PURPOSE (parm) = 0;
6326 /* See if any of the parmdecls specifies this parm by name.
6327 Ignore any enumerator decls. */
6328 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6329 if (DECL_NAME (tail) == TREE_VALUE (parm)
6330 && TREE_CODE (tail) == PARM_DECL)
6336 /* If declaration already marked, we have a duplicate name.
6337 Complain, and don't use this decl twice. */
6338 if (found && DECL_WEAK (found))
6340 error_with_decl (found, "multiple parameters named `%s'");
6344 /* If the declaration says "void", complain and ignore it. */
6345 if (found && VOID_TYPE_P (TREE_TYPE (found)))
6347 error_with_decl (found, "parameter `%s' declared void");
6348 TREE_TYPE (found) = integer_type_node;
6349 DECL_ARG_TYPE (found) = integer_type_node;
6350 layout_decl (found, 0);
6353 /* Traditionally, a parm declared float is actually a double. */
6354 if (found && flag_traditional
6355 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6357 TREE_TYPE (found) = double_type_node;
6358 DECL_ARG_TYPE (found) = double_type_node;
6359 layout_decl (found, 0);
6362 /* If no declaration found, default to int. */
6365 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6367 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6368 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6369 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6371 pedwarn_with_decl (found, "type of `%s' defaults to `int'");
6372 else if (extra_warnings)
6373 warning_with_decl (found, "type of `%s' defaults to `int'");
6377 TREE_PURPOSE (parm) = found;
6379 /* Mark this decl as "already found". */
6380 DECL_WEAK (found) = 1;
6383 /* Put anything which is on the parmdecls chain and which is
6384 not a PARM_DECL onto the list NONPARMS. (The types of
6385 non-parm things which might appear on the list include
6386 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6387 any actual PARM_DECLs not matched with any names. */
6390 for (parm = parmdecls; parm;)
6392 tree next = TREE_CHAIN (parm);
6393 TREE_CHAIN (parm) = 0;
6395 if (TREE_CODE (parm) != PARM_DECL)
6396 nonparms = chainon (nonparms, parm);
6399 /* Complain about args with incomplete types. */
6400 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6402 error_with_decl (parm, "parameter `%s' has incomplete type");
6403 TREE_TYPE (parm) = error_mark_node;
6406 if (! DECL_WEAK (parm))
6408 error_with_decl (parm,
6409 "declaration for parameter `%s' but no such parameter");
6410 /* Pretend the parameter was not missing.
6411 This gets us to a standard state and minimizes
6412 further error messages. */
6414 = chainon (specparms,
6415 tree_cons (parm, NULL_TREE, NULL_TREE));
6422 /* Chain the declarations together in the order of the list of
6423 names. Store that chain in the function decl, replacing the
6426 DECL_ARGUMENTS (fndecl) = 0;
6429 for (last = 0; parm; parm = TREE_CHAIN (parm))
6430 if (TREE_PURPOSE (parm))
6433 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6435 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6436 last = TREE_PURPOSE (parm);
6437 TREE_CHAIN (last) = 0;
6441 /* If there was a previous prototype,
6442 set the DECL_ARG_TYPE of each argument according to
6443 the type previously specified, and report any mismatches. */
6445 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6448 for (parm = DECL_ARGUMENTS (fndecl),
6449 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6450 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6451 != void_type_node));
6452 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6454 if (parm == 0 || type == 0
6455 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6457 error ("number of arguments doesn't match prototype");
6458 error_with_file_and_line (current_function_prototype_file,
6459 current_function_prototype_line,
6460 "prototype declaration");
6463 /* Type for passing arg must be consistent
6464 with that declared for the arg. */
6465 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
6467 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6468 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6470 /* Adjust argument to match prototype. E.g. a previous
6471 `int foo(float);' prototype causes
6472 `int foo(x) float x; {...}' to be treated like
6473 `int foo(float x) {...}'. This is particularly
6474 useful for argument types like uid_t. */
6475 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6477 if (PROMOTE_PROTOTYPES
6478 && (TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
6479 || TREE_CODE (TREE_TYPE (parm)) == ENUMERAL_TYPE)
6480 && TYPE_PRECISION (TREE_TYPE (parm))
6481 < TYPE_PRECISION (integer_type_node))
6482 DECL_ARG_TYPE (parm) = integer_type_node;
6486 pedwarn ("promoted argument `%s' doesn't match prototype",
6487 IDENTIFIER_POINTER (DECL_NAME (parm)));
6488 warning_with_file_and_line
6489 (current_function_prototype_file,
6490 current_function_prototype_line,
6491 "prototype declaration");
6494 /* If -traditional, allow `int' argument to match
6495 `unsigned' prototype. */
6496 else if (! (flag_traditional
6497 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6498 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6500 error ("argument `%s' doesn't match prototype",
6501 IDENTIFIER_POINTER (DECL_NAME (parm)));
6502 error_with_file_and_line (current_function_prototype_file,
6503 current_function_prototype_line,
6504 "prototype declaration");
6508 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6511 /* Otherwise, create a prototype that would match. */
6515 tree actual = 0, last = 0, type;
6517 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6519 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6521 TREE_CHAIN (last) = type;
6526 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6528 TREE_CHAIN (last) = type;
6532 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6533 of the type of this function, but we need to avoid having this
6534 affect the types of other similarly-typed functions, so we must
6535 first force the generation of an identical (but separate) type
6536 node for the relevant function type. The new node we create
6537 will be a variant of the main variant of the original function
6540 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6542 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6545 /* Now store the final chain of decls for the arguments
6546 as the decl-chain of the current lexical scope.
6547 Put the enumerators in as well, at the front so that
6548 DECL_ARGUMENTS is not modified. */
6550 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6553 /* Make sure the binding level for the top of the function body
6554 gets a BLOCK if there are any in the function.
6555 Otherwise, the dbx output is wrong. */
6557 keep_next_if_subblocks = 1;
6559 /* ??? This might be an improvement,
6560 but needs to be thought about some more. */
6562 keep_next_level_flag = 1;
6565 /* Write a record describing this function definition to the prototypes
6566 file (if requested). */
6568 gen_aux_info_record (fndecl, 1, 0, prototype);
6570 /* Initialize the RTL code for the function. */
6572 init_function_start (fndecl, input_filename, lineno);
6574 /* Begin the statement tree for this function. */
6575 DECL_LANG_SPECIFIC (current_function_decl)
6576 =((struct lang_decl *) ggc_alloc (sizeof (struct lang_decl)));
6577 begin_stmt_tree (&DECL_SAVED_TREE (current_function_decl));
6579 /* This function is being processed in whole-function mode. */
6580 cfun->x_whole_function_mode_p = 1;
6582 /* Even though we're inside a function body, we still don't want to
6583 call expand_expr to calculate the size of a variable-sized array.
6584 We haven't necessarily assigned RTL to all variables yet, so it's
6585 not safe to try to expand expressions involving them. */
6586 immediate_size_expand = 0;
6587 cfun->x_dont_save_pending_sizes_p = 1;
6590 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6591 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6592 stands for an ellipsis in the identifier list.
6594 PARMLIST is the data returned by get_parm_info for the
6595 parmlist that follows the semicolon.
6597 We return a value of the same sort that get_parm_info returns,
6598 except that it describes the combination of identifiers and parmlist. */
6601 combine_parm_decls (specparms, parmlist, void_at_end)
6602 tree specparms, parmlist;
6605 register tree fndecl = current_function_decl;
6608 tree parmdecls = TREE_PURPOSE (parmlist);
6610 /* This is a chain of any other decls that came in among the parm
6611 declarations. They were separated already by get_parm_info,
6612 so we just need to keep them separate. */
6613 tree nonparms = TREE_VALUE (parmlist);
6617 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6618 DECL_WEAK (parm) = 0;
6620 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6622 register tree tail, found = NULL;
6624 /* See if any of the parmdecls specifies this parm by name. */
6625 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6626 if (DECL_NAME (tail) == TREE_VALUE (parm))
6632 /* If declaration already marked, we have a duplicate name.
6633 Complain, and don't use this decl twice. */
6634 if (found && DECL_WEAK (found))
6636 error_with_decl (found, "multiple parameters named `%s'");
6640 /* If the declaration says "void", complain and ignore it. */
6641 if (found && VOID_TYPE_P (TREE_TYPE (found)))
6643 error_with_decl (found, "parameter `%s' declared void");
6644 TREE_TYPE (found) = integer_type_node;
6645 DECL_ARG_TYPE (found) = integer_type_node;
6646 layout_decl (found, 0);
6649 /* Traditionally, a parm declared float is actually a double. */
6650 if (found && flag_traditional
6651 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6653 TREE_TYPE (found) = double_type_node;
6654 DECL_ARG_TYPE (found) = double_type_node;
6655 layout_decl (found, 0);
6658 /* If no declaration found, default to int. */
6661 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6663 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6664 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6665 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6666 error_with_decl (found, "type of parameter `%s' is not declared");
6670 TREE_PURPOSE (parm) = found;
6672 /* Mark this decl as "already found". */
6673 DECL_WEAK (found) = 1;
6676 /* Complain about any actual PARM_DECLs not matched with any names. */
6678 for (parm = parmdecls; parm;)
6680 tree next = TREE_CHAIN (parm);
6681 TREE_CHAIN (parm) = 0;
6683 /* Complain about args with incomplete types. */
6684 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6686 error_with_decl (parm, "parameter `%s' has incomplete type");
6687 TREE_TYPE (parm) = error_mark_node;
6690 if (! DECL_WEAK (parm))
6692 error_with_decl (parm,
6693 "declaration for parameter `%s' but no such parameter");
6694 /* Pretend the parameter was not missing.
6695 This gets us to a standard state and minimizes
6696 further error messages. */
6698 = chainon (specparms,
6699 tree_cons (parm, NULL_TREE, NULL_TREE));
6705 /* Chain the declarations together in the order of the list of names.
6706 At the same time, build up a list of their types, in reverse order. */
6712 for (last = 0; parm; parm = TREE_CHAIN (parm))
6713 if (TREE_PURPOSE (parm))
6716 parmdecls = TREE_PURPOSE (parm);
6718 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6719 last = TREE_PURPOSE (parm);
6720 TREE_CHAIN (last) = 0;
6722 types = tree_cons (NULL_TREE, TREE_TYPE (parm), types);
6727 return tree_cons (parmdecls, nonparms,
6728 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
6730 return tree_cons (parmdecls, nonparms, nreverse (types));
6733 /* Finish up a function declaration and compile that function
6734 all the way to assembler language output. The free the storage
6735 for the function definition.
6737 This is called after parsing the body of the function definition.
6739 NESTED is nonzero if the function being finished is nested in another. */
6742 finish_function (nested)
6745 register tree fndecl = current_function_decl;
6747 /* TREE_READONLY (fndecl) = 1;
6748 This caused &foo to be of type ptr-to-const-function
6749 which then got a warning when stored in a ptr-to-function variable. */
6752 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6754 /* Must mark the RESULT_DECL as being in this function. */
6756 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6758 /* Obey `register' declarations if `setjmp' is called in this fn. */
6759 if (flag_traditional && current_function_calls_setjmp)
6761 setjmp_protect (DECL_INITIAL (fndecl));
6762 setjmp_protect_args ();
6765 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6767 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6768 != integer_type_node)
6770 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6771 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6773 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
6777 #ifdef DEFAULT_MAIN_RETURN
6778 /* Make it so that `main' always returns success by default. */
6779 DEFAULT_MAIN_RETURN;
6782 c_expand_return (integer_zero_node);
6787 finish_fname_decls ();
6789 /* Tie off the statement tree for this function. */
6790 finish_stmt_tree (&DECL_SAVED_TREE (fndecl));
6791 /* Clear out memory we no longer need. */
6792 free_after_parsing (cfun);
6793 /* Since we never call rest_of_compilation, we never clear
6794 CFUN. Do so explicitly. */
6795 free_after_compilation (cfun);
6800 /* Generate RTL for the body of this function. */
6801 c_expand_body (fndecl, nested);
6802 /* Let the error reporting routines know that we're outside a
6803 function. For a nested function, this value is used in
6804 pop_c_function_context and then reset via pop_function_context. */
6805 current_function_decl = NULL;
6809 /* Generate the RTL for the body of FNDECL. If NESTED_P is non-zero,
6810 then we are already in the process of generating RTL for another
6814 c_expand_body (fndecl, nested_p)
6818 /* There's no reason to do any of the work here if we're only doing
6819 semantic analysis; this code just generates RTL. */
6820 if (flag_syntax_only)
6823 /* Squirrel away our current state. */
6825 push_function_context ();
6827 /* Initialize the RTL code for the function. */
6828 current_function_decl = fndecl;
6829 init_function_start (fndecl, input_filename, DECL_SOURCE_LINE (fndecl));
6831 /* This function is being processed in whole-function mode. */
6832 cfun->x_whole_function_mode_p = 1;
6834 /* Even though we're inside a function body, we still don't want to
6835 call expand_expr to calculate the size of a variable-sized array.
6836 We haven't necessarily assigned RTL to all variables yet, so it's
6837 not safe to try to expand expressions involving them. */
6838 immediate_size_expand = 0;
6839 cfun->x_dont_save_pending_sizes_p = 1;
6841 /* If this is a varargs function, inform function.c. */
6842 if (c_function_varargs)
6845 /* Set up parameters and prepare for return, for the function. */
6846 expand_function_start (fndecl, 0);
6848 /* If this function is `main', emit a call to `__main'
6849 to run global initializers, etc. */
6850 if (DECL_NAME (fndecl)
6851 && MAIN_NAME_P (DECL_NAME (fndecl))
6852 && DECL_CONTEXT (fndecl) == NULL_TREE)
6853 expand_main_function ();
6855 /* Generate the RTL for this function. */
6856 expand_stmt (DECL_SAVED_TREE (fndecl));
6857 /* Allow the body of the function to be garbage collected. */
6858 DECL_SAVED_TREE (fndecl) = NULL_TREE;
6860 /* We hard-wired immediate_size_expand to zero in start_function.
6861 expand_function_end will decrement this variable. So, we set the
6862 variable to one here, so that after the decrement it will remain
6864 immediate_size_expand = 1;
6866 /* Allow language dialects to perform special processing. */
6867 if (lang_expand_function_end)
6868 (*lang_expand_function_end) ();
6870 /* Generate rtl for function exit. */
6871 expand_function_end (input_filename, lineno, 0);
6873 /* If this is a nested function, protect the local variables in the stack
6874 above us from being collected while we're compiling this function. */
6876 ggc_push_context ();
6878 /* Run the optimizers and output the assembler code for this function. */
6879 rest_of_compilation (fndecl);
6881 /* Undo the GC context switch. */
6885 /* With just -W, complain only if function returns both with
6886 and without a value. */
6888 && current_function_returns_value
6889 && current_function_returns_null)
6890 warning ("this function may return with or without a value");
6892 /* If requested, warn about function definitions where the function will
6893 return a value (usually of some struct or union type) which itself will
6894 take up a lot of stack space. */
6896 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6898 tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6900 if (ret_type && TYPE_SIZE_UNIT (ret_type)
6901 && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST
6902 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type),
6905 unsigned int size_as_int
6906 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type));
6908 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0)
6909 warning_with_decl (fndecl,
6910 "size of return value of `%s' is %u bytes",
6913 warning_with_decl (fndecl,
6914 "size of return value of `%s' is larger than %d bytes",
6919 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested_p)
6921 /* Stop pointing to the local nodes about to be freed.
6922 But DECL_INITIAL must remain nonzero so we know this
6923 was an actual function definition.
6924 For a nested function, this is done in pop_c_function_context.
6925 If rest_of_compilation set this to 0, leave it 0. */
6926 if (DECL_INITIAL (fndecl) != 0)
6927 DECL_INITIAL (fndecl) = error_mark_node;
6929 DECL_ARGUMENTS (fndecl) = 0;
6932 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6934 #ifndef ASM_OUTPUT_CONSTRUCTOR
6935 if (! flag_gnu_linker)
6936 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6939 assemble_constructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl)));
6942 if (DECL_STATIC_DESTRUCTOR (fndecl))
6944 #ifndef ASM_OUTPUT_DESTRUCTOR
6945 if (! flag_gnu_linker)
6946 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6949 assemble_destructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl)));
6954 /* Return to the enclosing function. */
6955 pop_function_context ();
6956 /* If the nested function was inline, write it out if that is
6958 if (!TREE_ASM_WRITTEN (fndecl) && TREE_ADDRESSABLE (fndecl))
6960 push_function_context ();
6961 output_inline_function (fndecl);
6962 pop_function_context ();
6968 /* Check the declarations given in a for-loop for satisfying the C99
6971 check_for_loop_decls ()
6977 /* If we get here, declarations have been used in a for loop without
6978 the C99 for loop scope. This doesn't make much sense, so don't
6980 error ("`for' loop initial declaration used outside C99 mode");
6983 /* C99 subclause 6.8.5 paragraph 3:
6985 [#3] The declaration part of a for statement shall only
6986 declare identifiers for objects having storage class auto or
6989 It isn't clear whether, in this sentence, "identifiers" binds to
6990 "shall only declare" or to "objects" - that is, whether all identifiers
6991 declared must be identifiers for objects, or whether the restriction
6992 only applies to those that are. (A question on this in comp.std.c
6993 in November 2000 received no answer.) We implement the strictest
6994 interpretation, to avoid creating an extension which later causes
6997 for (t = gettags (); t; t = TREE_CHAIN (t))
6999 if (TREE_PURPOSE (t) != 0)
7000 error ("`%s %s' declared in `for' loop initial declaration",
7001 (TREE_CODE (TREE_VALUE (t)) == RECORD_TYPE ? "struct"
7002 : TREE_CODE (TREE_VALUE (t)) == UNION_TYPE ? "union"
7004 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
7006 for (t = getdecls (); t; t = TREE_CHAIN (t))
7008 if (TREE_CODE (t) != VAR_DECL && DECL_NAME (t))
7009 error_with_decl (t, "declaration of non-variable `%s' in `for' loop initial declaration");
7010 else if (TREE_STATIC (t))
7011 error_with_decl (t, "declaration of static variable `%s' in `for' loop initial declaration");
7012 else if (DECL_EXTERNAL (t))
7013 error_with_decl (t, "declaration of `extern' variable `%s' in `for' loop initial declaration");
7017 /* Save and restore the variables in this file and elsewhere
7018 that keep track of the progress of compilation of the current function.
7019 Used for nested functions. */
7021 struct c_language_function
7023 struct language_function base;
7025 tree shadowed_labels;
7028 int warn_about_return_type;
7030 struct binding_level *binding_level;
7033 /* Save and reinitialize the variables
7034 used during compilation of a C function. */
7037 push_c_function_context (f)
7040 struct c_language_function *p;
7041 p = ((struct c_language_function *)
7042 xmalloc (sizeof (struct c_language_function)));
7043 f->language = (struct language_function *) p;
7045 p->base.x_stmt_tree = c_stmt_tree;
7046 p->base.x_scope_stmt_stack = c_scope_stmt_stack;
7047 p->named_labels = named_labels;
7048 p->shadowed_labels = shadowed_labels;
7049 p->returns_value = current_function_returns_value;
7050 p->returns_null = current_function_returns_null;
7051 p->warn_about_return_type = warn_about_return_type;
7052 p->extern_inline = current_extern_inline;
7053 p->binding_level = current_binding_level;
7056 /* Restore the variables used during compilation of a C function. */
7059 pop_c_function_context (f)
7062 struct c_language_function *p
7063 = (struct c_language_function *) f->language;
7066 /* Bring back all the labels that were shadowed. */
7067 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
7068 if (DECL_NAME (TREE_VALUE (link)) != 0)
7069 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
7070 = TREE_VALUE (link);
7072 if (DECL_SAVED_INSNS (current_function_decl) == 0
7073 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
7075 /* Stop pointing to the local nodes about to be freed. */
7076 /* But DECL_INITIAL must remain nonzero so we know this
7077 was an actual function definition. */
7078 DECL_INITIAL (current_function_decl) = error_mark_node;
7079 DECL_ARGUMENTS (current_function_decl) = 0;
7082 c_stmt_tree = p->base.x_stmt_tree;
7083 c_scope_stmt_stack = p->base.x_scope_stmt_stack;
7084 named_labels = p->named_labels;
7085 shadowed_labels = p->shadowed_labels;
7086 current_function_returns_value = p->returns_value;
7087 current_function_returns_null = p->returns_null;
7088 warn_about_return_type = p->warn_about_return_type;
7089 current_extern_inline = p->extern_inline;
7090 current_binding_level = p->binding_level;
7096 /* Mark the language specific parts of F for GC. */
7099 mark_c_function_context (f)
7102 struct c_language_function *p
7103 = (struct c_language_function *) f->language;
7108 mark_c_language_function (&p->base);
7109 ggc_mark_tree (p->shadowed_labels);
7110 ggc_mark_tree (p->named_labels);
7111 mark_binding_level (&p->binding_level);
7114 /* Copy the DECL_LANG_SEPECIFIC data associated with NODE. */
7117 copy_lang_decl (decl)
7120 struct lang_decl *ld;
7122 if (!DECL_LANG_SPECIFIC (decl))
7125 ld = (struct lang_decl *) ggc_alloc (sizeof (struct lang_decl));
7126 memcpy ((char *) ld, (char *) DECL_LANG_SPECIFIC (decl),
7127 sizeof (struct lang_decl));
7128 DECL_LANG_SPECIFIC (decl) = ld;
7131 /* Mark the language specific bits in T for GC. */
7137 if (TREE_CODE (t) == IDENTIFIER_NODE)
7139 struct lang_identifier *i = (struct lang_identifier *) t;
7140 ggc_mark_tree (i->global_value);
7141 ggc_mark_tree (i->local_value);
7142 ggc_mark_tree (i->label_value);
7143 ggc_mark_tree (i->implicit_decl);
7144 ggc_mark_tree (i->error_locus);
7145 ggc_mark_tree (i->limbo_value);
7147 else if (TYPE_P (t) && TYPE_LANG_SPECIFIC (t))
7148 ggc_mark (TYPE_LANG_SPECIFIC (t));
7149 else if (DECL_P (t) && DECL_LANG_SPECIFIC (t))
7151 ggc_mark (DECL_LANG_SPECIFIC (t));
7152 c_mark_lang_decl (&DECL_LANG_SPECIFIC (t)->base);
7156 /* The functions below are required for functionality of doing
7157 function at once processing in the C front end. Currently these
7158 functions are not called from anywhere in the C front end, but as
7159 these changes continue, that will change. */
7161 /* Returns non-zero if the current statement is a full expression,
7162 i.e. temporaries created during that statement should be destroyed
7163 at the end of the statement. */
7166 stmts_are_full_exprs_p ()
7171 /* Returns the stmt_tree (if any) to which statements are currently
7172 being added. If there is no active statement-tree, NULL is
7176 current_stmt_tree ()
7178 return &c_stmt_tree;
7181 /* Returns the stack of SCOPE_STMTs for the current function. */
7184 current_scope_stmt_stack ()
7186 return &c_scope_stmt_stack;
7189 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
7193 anon_aggr_type_p (node)
7194 tree node ATTRIBUTE_UNUSED;
7199 /* Dummy function in place of callback used by C++. */
7202 extract_interface_info ()
7206 /* Return a new COMPOUND_STMT, after adding it to the current
7210 c_begin_compound_stmt ()
7214 /* Create the COMPOUND_STMT. */
7215 stmt = add_stmt (build_stmt (COMPOUND_STMT, NULL_TREE));
7220 /* Expand T (a DECL_STMT) if it declares an entity not handled by the
7224 c_expand_decl_stmt (t)
7227 tree decl = DECL_STMT_DECL (t);
7229 /* Expand nested functions. */
7230 if (TREE_CODE (decl) == FUNCTION_DECL
7231 && DECL_CONTEXT (decl) == current_function_decl
7232 && DECL_SAVED_TREE (decl))
7233 c_expand_body (decl, /*nested_p=*/1);
7236 /* Return the IDENTIFIER_GLOBAL_VALUE of T, for use in common code, since
7237 the definition of IDENTIFIER_GLOBAL_VALUE is different for C and C++. */
7240 identifier_global_value (t)
7243 return IDENTIFIER_GLOBAL_VALUE (t);
7246 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
7247 otherwise the name is found in ridpointers from RID_INDEX. */
7250 record_builtin_type (rid_index, name, type)
7257 id = ridpointers[(int) rid_index];
7259 id = get_identifier (name);
7260 pushdecl (build_decl (TYPE_DECL, id, type));
7263 /* Build the void_list_node (void_type_node having been created). */
7265 build_void_list_node ()
7267 tree t = build_tree_list (NULL_TREE, void_type_node);