1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
33 #include "tree-inline.h"
49 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
51 { NORMAL, /* Ordinary declaration */
52 FUNCDEF, /* Function definition */
53 PARM, /* Declaration of parm before function body */
54 FIELD, /* Declaration inside struct or union */
55 BITFIELD, /* Likewise but with specified width */
56 TYPENAME}; /* Typename (inside cast or sizeof) */
59 /* Nonzero if we have seen an invalid cross reference
60 to a struct, union, or enum, but not yet printed the message. */
62 tree pending_invalid_xref;
63 /* File and line to appear in the eventual error message. */
64 const char *pending_invalid_xref_file;
65 int pending_invalid_xref_line;
67 /* While defining an enum type, this is 1 plus the last enumerator
68 constant value. Note that will do not have to save this or `enum_overflow'
69 around nested function definition since such a definition could only
70 occur in an enum value expression and we don't use these variables in
73 static tree enum_next_value;
75 /* Nonzero means that there was overflow computing enum_next_value. */
77 static int enum_overflow;
79 /* Parsing a function declarator leaves a list of parameter names
80 or a chain or parameter decls here. */
82 static tree last_function_parms;
84 /* Parsing a function declarator leaves here a chain of structure
85 and enum types declared in the parmlist. */
87 static tree last_function_parm_tags;
89 /* After parsing the declarator that starts a function definition,
90 `start_function' puts here the list of parameter names or chain of decls.
91 `store_parm_decls' finds it here. */
93 static tree current_function_parms;
95 /* Similar, for last_function_parm_tags. */
96 static tree current_function_parm_tags;
98 /* Similar, for the file and line that the prototype came from if this is
99 an old-style definition. */
100 static const char *current_function_prototype_file;
101 static int current_function_prototype_line;
103 /* The current statement tree. */
105 static struct stmt_tree_s c_stmt_tree;
107 /* The current scope statement stack. */
109 static tree c_scope_stmt_stack;
111 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
112 that have names. Here so we can clear out their names' definitions
113 at the end of the function. */
115 static tree named_labels;
117 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
119 static tree shadowed_labels;
121 /* Nonzero when store_parm_decls is called indicates a varargs function.
122 Value not meaningful after store_parm_decls. */
124 static int c_function_varargs;
126 /* Set to 0 at beginning of a function definition, set to 1 if
127 a return statement that specifies a return value is seen. */
129 int current_function_returns_value;
131 /* Set to 0 at beginning of a function definition, set to 1 if
132 a return statement with no argument is seen. */
134 int current_function_returns_null;
136 /* Set to nonzero by `grokdeclarator' for a function
137 whose return type is defaulted, if warnings for this are desired. */
139 static int warn_about_return_type;
141 /* Nonzero when starting a function declared `extern inline'. */
143 static int current_extern_inline;
145 /* For each binding contour we allocate a binding_level structure
146 * which records the names defined in that contour.
149 * 1) one for each function definition,
150 * where internal declarations of the parameters appear.
151 * 2) one for each compound statement,
152 * to record its declarations.
154 * The current meaning of a name can be found by searching the levels from
155 * the current one out to the global one.
158 /* Note that the information in the `names' component of the global contour
159 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
163 /* A chain of _DECL nodes for all variables, constants, functions,
164 and typedef types. These are in the reverse of the order supplied.
168 /* A list of structure, union and enum definitions,
169 * for looking up tag names.
170 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
171 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
172 * or ENUMERAL_TYPE node.
176 /* For each level, a list of shadowed outer-level local definitions
177 to be restored when this level is popped.
178 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
179 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
182 /* For each level (except not the global one),
183 a chain of BLOCK nodes for all the levels
184 that were entered and exited one level down. */
187 /* The BLOCK node for this level, if one has been preallocated.
188 If 0, the BLOCK is allocated (if needed) when the level is popped. */
191 /* The binding level which this one is contained in (inherits from). */
192 struct binding_level *level_chain;
194 /* Nonzero for the level that holds the parameters of a function. */
197 /* Nonzero if this level "doesn't exist" for tags. */
198 char tag_transparent;
200 /* Nonzero if sublevels of this level "don't exist" for tags.
201 This is set in the parm level of a function definition
202 while reading the function body, so that the outermost block
203 of the function body will be tag-transparent. */
204 char subblocks_tag_transparent;
206 /* Nonzero means make a BLOCK for this level regardless of all else. */
209 /* Nonzero means make a BLOCK if this level has any subblocks. */
210 char keep_if_subblocks;
212 /* Number of decls in `names' that have incomplete
213 structure or union types. */
216 /* A list of decls giving the (reversed) specified order of parms,
217 not including any forward-decls in the parmlist.
218 This is so we can put the parms in proper order for assign_parms. */
222 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
224 /* The binding level currently in effect. */
226 static struct binding_level *current_binding_level;
228 /* A chain of binding_level structures awaiting reuse. */
230 static struct binding_level *free_binding_level;
232 /* The outermost binding level, for names of file scope.
233 This is created when the compiler is started and exists
234 through the entire run. */
236 static struct binding_level *global_binding_level;
238 /* Binding level structures are initialized by copying this one. */
240 static struct binding_level clear_binding_level
241 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, 0,
244 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
246 static int keep_next_level_flag;
248 /* Nonzero means make a BLOCK for the next level pushed
249 if it has subblocks. */
251 static int keep_next_if_subblocks;
253 /* The chain of outer levels of label scopes.
254 This uses the same data structure used for binding levels,
255 but it works differently: each link in the chain records
256 saved values of named_labels and shadowed_labels for
257 a label binding level outside the current one. */
259 static struct binding_level *label_level_chain;
261 /* Functions called automatically at the beginning and end of execution. */
263 tree static_ctors, static_dtors;
265 /* Forward declarations. */
267 static struct binding_level * make_binding_level PARAMS ((void));
268 static void mark_binding_level PARAMS ((void *));
269 static void clear_limbo_values PARAMS ((tree));
270 static int duplicate_decls PARAMS ((tree, tree, int));
271 static int redeclaration_error_message PARAMS ((tree, tree));
272 static void storedecls PARAMS ((tree));
273 static void storetags PARAMS ((tree));
274 static tree lookup_tag PARAMS ((enum tree_code, tree,
275 struct binding_level *, int));
276 static tree lookup_tag_reverse PARAMS ((tree));
277 static tree grokdeclarator PARAMS ((tree, tree, enum decl_context,
279 static tree grokparms PARAMS ((tree, int));
280 static void layout_array_type PARAMS ((tree));
281 static tree c_make_fname_decl PARAMS ((tree, int));
282 static void c_expand_body PARAMS ((tree, int));
284 /* C-specific option variables. */
286 /* Nonzero means allow type mismatches in conditional expressions;
287 just make their values `void'. */
289 int flag_cond_mismatch;
291 /* Nonzero means don't recognize the keyword `asm'. */
295 /* Nonzero means do some things the same way PCC does. */
297 int flag_traditional;
299 /* Nonzero means enable C89 Amendment 1 features. */
303 /* Nonzero means use the ISO C99 dialect of C. */
307 /* Nonzero means that we have builtin functions, and main is an int */
311 /* Nonzero means add default format_arg attributes for functions not
314 int flag_noniso_default_format_attributes = 1;
316 /* Nonzero means to allow single precision math even if we're generally
317 being traditional. */
318 int flag_allow_single_precision = 0;
320 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
322 int flag_signed_bitfields = 1;
323 int explicit_flag_signed_bitfields = 0;
325 /* Nonzero means warn about use of implicit int. */
327 int warn_implicit_int;
329 /* Nonzero means warn about usage of long long when `-pedantic'. */
331 int warn_long_long = 1;
333 /* Nonzero means message about use of implicit function declarations;
334 1 means warning; 2 means error. */
336 int mesg_implicit_function_declaration = -1;
338 /* Nonzero means give string constants the type `const char *'
339 to get extra warnings from them. These warnings will be too numerous
340 to be useful, except in thoroughly ANSIfied programs. */
342 int flag_const_strings;
344 /* Nonzero means warn about pointer casts that can drop a type qualifier
345 from the pointer target type. */
349 /* Nonzero means warn when casting a function call to a type that does
350 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
351 when there is no previous declaration of sqrt or malloc. */
353 int warn_bad_function_cast;
355 /* Warn about functions which might be candidates for format attributes. */
357 int warn_missing_format_attribute;
359 /* Warn about traditional constructs whose meanings changed in ANSI C. */
361 int warn_traditional;
363 /* Nonzero means warn about sizeof(function) or addition/subtraction
364 of function pointers. */
366 int warn_pointer_arith;
368 /* Nonzero means warn for non-prototype function decls
369 or non-prototyped defs without previous prototype. */
371 int warn_strict_prototypes;
373 /* Nonzero means warn for any global function def
374 without separate previous prototype decl. */
376 int warn_missing_prototypes;
378 /* Nonzero means warn for any global function def
379 without separate previous decl. */
381 int warn_missing_declarations;
383 /* Nonzero means warn about multiple (redundant) decls for the same single
384 variable or function. */
386 int warn_redundant_decls = 0;
388 /* Nonzero means warn about extern declarations of objects not at
389 file-scope level and about *all* declarations of functions (whether
390 extern or static) not at file-scope level. Note that we exclude
391 implicit function declarations. To get warnings about those, use
394 int warn_nested_externs = 0;
396 /* Warn about a subscript that has type char. */
398 int warn_char_subscripts = 0;
400 /* Warn if a type conversion is done that might have confusing results. */
404 /* Warn if adding () is suggested. */
406 int warn_parentheses;
408 /* Warn if initializer is not completely bracketed. */
410 int warn_missing_braces;
412 /* Warn if main is suspicious. */
416 /* Warn about #pragma directives that are not recognised. */
418 int warn_unknown_pragmas = 0; /* Tri state variable. */
420 /* Warn about comparison of signed and unsigned values.
421 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
423 int warn_sign_compare = -1;
425 /* Warn about testing equality of floating point numbers. */
427 int warn_float_equal = 0;
429 /* Nonzero means warn about use of multicharacter literals. */
431 int warn_multichar = 1;
433 /* The variant of the C language being processed. */
435 c_language_kind c_language = clk_c;
437 /* Nonzero means `$' can be in an identifier. */
439 #ifndef DOLLARS_IN_IDENTIFIERS
440 #define DOLLARS_IN_IDENTIFIERS 1
442 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
444 /* Decode the string P as a language-specific option for C.
445 Return the number of strings consumed. Should not complain
446 if it does not recognise the option. */
449 c_decode_option (argc, argv)
450 int argc ATTRIBUTE_UNUSED;
453 int strings_processed;
456 strings_processed = cpp_handle_option (parse_in, argc, argv);
458 if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
460 flag_traditional = 1;
461 flag_writable_strings = 1;
463 else if (!strcmp (p, "-fallow-single-precision"))
464 flag_allow_single_precision = 1;
465 else if (!strcmp (p, "-fhosted") || !strcmp (p, "-fno-freestanding"))
470 else if (!strcmp (p, "-ffreestanding") || !strcmp (p, "-fno-hosted"))
474 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
478 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
480 flag_traditional = 0;
481 flag_writable_strings = 0;
483 else if (!strncmp (p, "-std=", 5))
485 /* Select the appropriate language standard. We currently
487 -std=iso9899:1990 same as -ansi
488 -std=iso9899:199409 ISO C as modified in amend. 1
489 -std=iso9899:1999 ISO C 99
490 -std=c89 same as -std=iso9899:1990
491 -std=c99 same as -std=iso9899:1999
492 -std=gnu89 default, iso9899:1990 + gnu extensions
493 -std=gnu99 iso9899:1999 + gnu extensions
495 const char *const argstart = &p[5];
497 if (!strcmp (argstart, "iso9899:1990")
498 || !strcmp (argstart, "c89"))
503 flag_traditional = 0;
504 flag_writable_strings = 0;
506 flag_no_nonansi_builtin = 1;
507 flag_noniso_default_format_attributes = 0;
510 else if (!strcmp (argstart, "iso9899:199409"))
515 else if (!strcmp (argstart, "iso9899:199x")
516 || !strcmp (argstart, "iso9899:1999")
517 || !strcmp (argstart, "c9x")
518 || !strcmp (argstart, "c99"))
520 flag_traditional = 0;
521 flag_writable_strings = 0;
523 flag_no_nonansi_builtin = 1;
524 flag_noniso_default_format_attributes = 0;
528 else if (!strcmp (argstart, "gnu89"))
530 flag_traditional = 0;
531 flag_writable_strings = 0;
533 flag_no_nonansi_builtin = 0;
534 flag_noniso_default_format_attributes = 1;
538 else if (!strcmp (argstart, "gnu9x") || !strcmp (argstart, "gnu99"))
540 flag_traditional = 0;
541 flag_writable_strings = 0;
543 flag_no_nonansi_builtin = 0;
544 flag_noniso_default_format_attributes = 1;
549 error ("unknown C standard `%s'", argstart);
551 else if (!strcmp (p, "-fdollars-in-identifiers"))
552 dollars_in_ident = 1;
553 else if (!strcmp (p, "-fno-dollars-in-identifiers"))
554 dollars_in_ident = 0;
555 else if (!strcmp (p, "-fsigned-char"))
556 flag_signed_char = 1;
557 else if (!strcmp (p, "-funsigned-char"))
558 flag_signed_char = 0;
559 else if (!strcmp (p, "-fno-signed-char"))
560 flag_signed_char = 0;
561 else if (!strcmp (p, "-fno-unsigned-char"))
562 flag_signed_char = 1;
563 else if (!strcmp (p, "-fsigned-bitfields")
564 || !strcmp (p, "-fno-unsigned-bitfields"))
566 flag_signed_bitfields = 1;
567 explicit_flag_signed_bitfields = 1;
569 else if (!strcmp (p, "-funsigned-bitfields")
570 || !strcmp (p, "-fno-signed-bitfields"))
572 flag_signed_bitfields = 0;
573 explicit_flag_signed_bitfields = 1;
575 else if (!strcmp (p, "-fshort-enums"))
576 flag_short_enums = 1;
577 else if (!strcmp (p, "-fno-short-enums"))
578 flag_short_enums = 0;
579 else if (!strcmp (p, "-fshort-wchar"))
580 flag_short_wchar = 1;
581 else if (!strcmp (p, "-fno-short-wchar"))
582 flag_short_wchar = 0;
583 else if (!strcmp (p, "-fcond-mismatch"))
584 flag_cond_mismatch = 1;
585 else if (!strcmp (p, "-fno-cond-mismatch"))
586 flag_cond_mismatch = 0;
587 else if (!strcmp (p, "-fshort-double"))
588 flag_short_double = 1;
589 else if (!strcmp (p, "-fno-short-double"))
590 flag_short_double = 0;
591 else if (!strcmp (p, "-fasm"))
593 else if (!strcmp (p, "-fno-asm"))
595 else if (!strcmp (p, "-fbuiltin"))
597 else if (!strcmp (p, "-fno-builtin"))
599 else if (p[0] == '-' && p[1] == 'f' && dump_switch_p (p + 2))
601 else if (!strcmp (p, "-ansi"))
603 else if (!strcmp (p, "-Werror-implicit-function-declaration"))
604 mesg_implicit_function_declaration = 2;
605 else if (!strcmp (p, "-Wimplicit-function-declaration"))
606 mesg_implicit_function_declaration = 1;
607 else if (!strcmp (p, "-Wno-implicit-function-declaration"))
608 mesg_implicit_function_declaration = 0;
609 else if (!strcmp (p, "-Wimplicit-int"))
610 warn_implicit_int = 1;
611 else if (!strcmp (p, "-Wno-implicit-int"))
612 warn_implicit_int = 0;
613 else if (!strcmp (p, "-Wimplicit"))
615 warn_implicit_int = 1;
616 if (mesg_implicit_function_declaration != 2)
617 mesg_implicit_function_declaration = 1;
619 else if (!strcmp (p, "-Wno-implicit"))
620 warn_implicit_int = 0, mesg_implicit_function_declaration = 0;
621 else if (!strcmp (p, "-Wlong-long"))
623 else if (!strcmp (p, "-Wno-long-long"))
625 else if (!strcmp (p, "-Wwrite-strings"))
626 flag_const_strings = 1;
627 else if (!strcmp (p, "-Wno-write-strings"))
628 flag_const_strings = 0;
629 else if (!strcmp (p, "-Wcast-qual"))
631 else if (!strcmp (p, "-Wno-cast-qual"))
633 else if (!strcmp (p, "-Wbad-function-cast"))
634 warn_bad_function_cast = 1;
635 else if (!strcmp (p, "-Wno-bad-function-cast"))
636 warn_bad_function_cast = 0;
637 else if (!strcmp (p, "-Wno-missing-noreturn"))
638 warn_missing_noreturn = 0;
639 else if (!strcmp (p, "-Wmissing-format-attribute"))
640 warn_missing_format_attribute = 1;
641 else if (!strcmp (p, "-Wno-missing-format-attribute"))
642 warn_missing_format_attribute = 0;
643 else if (!strcmp (p, "-Wpointer-arith"))
644 warn_pointer_arith = 1;
645 else if (!strcmp (p, "-Wno-pointer-arith"))
646 warn_pointer_arith = 0;
647 else if (!strcmp (p, "-Wstrict-prototypes"))
648 warn_strict_prototypes = 1;
649 else if (!strcmp (p, "-Wno-strict-prototypes"))
650 warn_strict_prototypes = 0;
651 else if (!strcmp (p, "-Wmissing-prototypes"))
652 warn_missing_prototypes = 1;
653 else if (!strcmp (p, "-Wno-missing-prototypes"))
654 warn_missing_prototypes = 0;
655 else if (!strcmp (p, "-Wmissing-declarations"))
656 warn_missing_declarations = 1;
657 else if (!strcmp (p, "-Wno-missing-declarations"))
658 warn_missing_declarations = 0;
659 else if (!strcmp (p, "-Wredundant-decls"))
660 warn_redundant_decls = 1;
661 else if (!strcmp (p, "-Wno-redundant-decls"))
662 warn_redundant_decls = 0;
663 else if (!strcmp (p, "-Wnested-externs"))
664 warn_nested_externs = 1;
665 else if (!strcmp (p, "-Wno-nested-externs"))
666 warn_nested_externs = 0;
667 else if (!strcmp (p, "-Wtraditional"))
668 warn_traditional = 1;
669 else if (!strcmp (p, "-Wno-traditional"))
670 warn_traditional = 0;
671 else if (!strncmp (p, "-Wformat=", 9))
672 set_Wformat (atoi (p + 9));
673 else if (!strcmp (p, "-Wformat"))
675 else if (!strcmp (p, "-Wno-format"))
677 else if (!strcmp (p, "-Wformat-y2k"))
679 else if (!strcmp (p, "-Wno-format-y2k"))
681 else if (!strcmp (p, "-Wformat-extra-args"))
682 warn_format_extra_args = 1;
683 else if (!strcmp (p, "-Wno-format-extra-args"))
684 warn_format_extra_args = 0;
685 else if (!strcmp (p, "-Wformat-nonliteral"))
686 warn_format_nonliteral = 1;
687 else if (!strcmp (p, "-Wno-format-nonliteral"))
688 warn_format_nonliteral = 0;
689 else if (!strcmp (p, "-Wformat-security"))
690 warn_format_security = 1;
691 else if (!strcmp (p, "-Wno-format-security"))
692 warn_format_security = 0;
693 else if (!strcmp (p, "-Wchar-subscripts"))
694 warn_char_subscripts = 1;
695 else if (!strcmp (p, "-Wno-char-subscripts"))
696 warn_char_subscripts = 0;
697 else if (!strcmp (p, "-Wconversion"))
699 else if (!strcmp (p, "-Wno-conversion"))
701 else if (!strcmp (p, "-Wparentheses"))
702 warn_parentheses = 1;
703 else if (!strcmp (p, "-Wno-parentheses"))
704 warn_parentheses = 0;
705 else if (!strcmp (p, "-Wreturn-type"))
706 warn_return_type = 1;
707 else if (!strcmp (p, "-Wno-return-type"))
708 warn_return_type = 0;
709 else if (!strcmp (p, "-Wsequence-point"))
710 warn_sequence_point = 1;
711 else if (!strcmp (p, "-Wno-sequence-point"))
712 warn_sequence_point = 0;
713 else if (!strcmp (p, "-Wcomment"))
714 ; /* cpp handles this one. */
715 else if (!strcmp (p, "-Wno-comment"))
716 ; /* cpp handles this one. */
717 else if (!strcmp (p, "-Wcomments"))
718 ; /* cpp handles this one. */
719 else if (!strcmp (p, "-Wno-comments"))
720 ; /* cpp handles this one. */
721 else if (!strcmp (p, "-Wtrigraphs"))
722 ; /* cpp handles this one. */
723 else if (!strcmp (p, "-Wno-trigraphs"))
724 ; /* cpp handles this one. */
725 else if (!strcmp (p, "-Wundef"))
726 ; /* cpp handles this one. */
727 else if (!strcmp (p, "-Wno-undef"))
728 ; /* cpp handles this one. */
729 else if (!strcmp (p, "-Wimport"))
730 ; /* cpp handles this one. */
731 else if (!strcmp (p, "-Wno-import"))
732 ; /* cpp handles this one. */
733 else if (!strcmp (p, "-Wmissing-braces"))
734 warn_missing_braces = 1;
735 else if (!strcmp (p, "-Wno-missing-braces"))
736 warn_missing_braces = 0;
737 else if (!strcmp (p, "-Wmain"))
739 else if (!strcmp (p, "-Wno-main"))
741 else if (!strcmp (p, "-Wsign-compare"))
742 warn_sign_compare = 1;
743 else if (!strcmp (p, "-Wno-sign-compare"))
744 warn_sign_compare = 0;
745 else if (!strcmp (p, "-Wfloat-equal"))
746 warn_float_equal = 1;
747 else if (!strcmp (p, "-Wno-float-equal"))
748 warn_float_equal = 0;
749 else if (!strcmp (p, "-Wmultichar"))
751 else if (!strcmp (p, "-Wno-multichar"))
753 else if (!strcmp (p, "-Wdiv-by-zero"))
754 warn_div_by_zero = 1;
755 else if (!strcmp (p, "-Wno-div-by-zero"))
756 warn_div_by_zero = 0;
757 else if (!strcmp (p, "-Wunknown-pragmas"))
758 /* Set to greater than 1, so that even unknown pragmas in system
759 headers will be warned about. */
760 warn_unknown_pragmas = 2;
761 else if (!strcmp (p, "-Wno-unknown-pragmas"))
762 warn_unknown_pragmas = 0;
763 else if (!strcmp (p, "-Wall"))
765 /* We save the value of warn_uninitialized, since if they put
766 -Wuninitialized on the command line, we need to generate a
767 warning about not using it without also specifying -O. */
768 if (warn_uninitialized != 1)
769 warn_uninitialized = 2;
770 warn_implicit_int = 1;
771 mesg_implicit_function_declaration = 1;
772 warn_return_type = 1;
776 warn_char_subscripts = 1;
777 warn_parentheses = 1;
778 warn_sequence_point = 1;
779 warn_missing_braces = 1;
780 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
781 it off only if it's not explicit. */
783 /* Only warn about unknown pragmas that are not in system headers. */
784 warn_unknown_pragmas = 1;
787 return strings_processed;
792 /* Hooks for print_node. */
795 print_lang_decl (file, node, indent)
796 FILE *file ATTRIBUTE_UNUSED;
797 tree node ATTRIBUTE_UNUSED;
798 int indent ATTRIBUTE_UNUSED;
803 print_lang_type (file, node, indent)
804 FILE *file ATTRIBUTE_UNUSED;
805 tree node ATTRIBUTE_UNUSED;
806 int indent ATTRIBUTE_UNUSED;
811 print_lang_identifier (file, node, indent)
816 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
817 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
818 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
819 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
820 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
821 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
822 if (C_IS_RESERVED_WORD (node))
824 tree rid = ridpointers[C_RID_CODE (node)];
825 indent_to (file, indent + 4);
826 fprintf (file, "rid ");
827 fprintf (file, HOST_PTR_PRINTF, (void *)rid);
828 fprintf (file, " \"%s\"", IDENTIFIER_POINTER (rid));
832 /* Hook called at end of compilation to assume 1 elt
833 for a top-level tentative array defn that wasn't complete before. */
836 finish_incomplete_decl (decl)
839 if (TREE_CODE (decl) == VAR_DECL)
841 tree type = TREE_TYPE (decl);
842 if (type != error_mark_node
843 && TREE_CODE (type) == ARRAY_TYPE
844 && ! DECL_EXTERNAL (decl)
845 && TYPE_DOMAIN (type) == 0)
847 warning_with_decl (decl, "array `%s' assumed to have one element");
849 complete_array_type (type, NULL_TREE, 1);
851 layout_decl (decl, 0);
856 /* Create a new `struct binding_level'. */
858 static struct binding_level *
859 make_binding_level ()
862 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
865 /* Nonzero if we are currently in the global binding level. */
870 return current_binding_level == global_binding_level;
876 keep_next_level_flag = 1;
879 /* Nonzero if the current level needs to have a BLOCK made. */
884 return ((current_binding_level->keep_if_subblocks
885 && current_binding_level->blocks != 0)
886 || current_binding_level->keep
887 || current_binding_level->names != 0
888 || (current_binding_level->tags != 0
889 && !current_binding_level->tag_transparent));
892 /* Identify this binding level as a level of parameters.
893 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
894 But it turns out there is no way to pass the right value for
895 DEFINITION_FLAG, so we ignore it. */
898 declare_parm_level (definition_flag)
899 int definition_flag ATTRIBUTE_UNUSED;
901 current_binding_level->parm_flag = 1;
904 /* Nonzero if currently making parm declarations. */
909 return current_binding_level->parm_flag;
912 /* Enter a new binding level.
913 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
914 not for that of tags. */
917 pushlevel (tag_transparent)
920 struct binding_level *newlevel = NULL_BINDING_LEVEL;
922 /* If this is the top level of a function,
923 just make sure that NAMED_LABELS is 0. */
925 if (current_binding_level == global_binding_level)
930 /* Reuse or create a struct for this binding level. */
932 if (free_binding_level)
934 newlevel = free_binding_level;
935 free_binding_level = free_binding_level->level_chain;
939 newlevel = make_binding_level ();
942 /* Add this level to the front of the chain (stack) of levels that
945 *newlevel = clear_binding_level;
946 newlevel->tag_transparent
948 || (current_binding_level
949 ? current_binding_level->subblocks_tag_transparent
951 newlevel->level_chain = current_binding_level;
952 current_binding_level = newlevel;
953 newlevel->keep = keep_next_level_flag;
954 keep_next_level_flag = 0;
955 newlevel->keep_if_subblocks = keep_next_if_subblocks;
956 keep_next_if_subblocks = 0;
959 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
962 clear_limbo_values (block)
967 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
968 if (DECL_NAME (tem) != 0)
969 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
971 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
972 clear_limbo_values (tem);
975 /* Exit a binding level.
976 Pop the level off, and restore the state of the identifier-decl mappings
977 that were in effect when this level was entered.
979 If KEEP is nonzero, this level had explicit declarations, so
980 and create a "block" (a BLOCK node) for the level
981 to record its declarations and subblocks for symbol table output.
983 If FUNCTIONBODY is nonzero, this level is the body of a function,
984 so create a block as if KEEP were set and also clear out all
987 If REVERSE is nonzero, reverse the order of decls before putting
988 them into the BLOCK. */
991 poplevel (keep, reverse, functionbody)
997 /* The chain of decls was accumulated in reverse order.
998 Put it into forward order, just for cleanliness. */
1000 tree tags = current_binding_level->tags;
1001 tree subblocks = current_binding_level->blocks;
1004 int block_previously_created;
1006 keep |= current_binding_level->keep;
1008 /* This warning is turned off because it causes warnings for
1009 declarations like `extern struct foo *x'. */
1011 /* Warn about incomplete structure types in this level. */
1012 for (link = tags; link; link = TREE_CHAIN (link))
1013 if (!COMPLETE_TYPE_P (TREE_VALUE (link)))
1015 tree type = TREE_VALUE (link);
1016 tree type_name = TYPE_NAME (type);
1017 char *id = IDENTIFIER_POINTER (TREE_CODE (type_name) == IDENTIFIER_NODE
1019 : DECL_NAME (type_name));
1020 switch (TREE_CODE (type))
1023 error ("`struct %s' incomplete in scope ending here", id);
1026 error ("`union %s' incomplete in scope ending here", id);
1029 error ("`enum %s' incomplete in scope ending here", id);
1035 /* Get the decls in the order they were written.
1036 Usually current_binding_level->names is in reverse order.
1037 But parameter decls were previously put in forward order. */
1040 current_binding_level->names
1041 = decls = nreverse (current_binding_level->names);
1043 decls = current_binding_level->names;
1045 /* Output any nested inline functions within this block
1046 if they weren't already output. */
1048 for (decl = decls; decl; decl = TREE_CHAIN (decl))
1049 if (TREE_CODE (decl) == FUNCTION_DECL
1050 && ! TREE_ASM_WRITTEN (decl)
1051 && DECL_INITIAL (decl) != 0
1052 && TREE_ADDRESSABLE (decl))
1054 /* If this decl was copied from a file-scope decl
1055 on account of a block-scope extern decl,
1056 propagate TREE_ADDRESSABLE to the file-scope decl.
1058 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1059 true, since then the decl goes through save_for_inline_copying. */
1060 if (DECL_ABSTRACT_ORIGIN (decl) != 0
1061 && DECL_ABSTRACT_ORIGIN (decl) != decl)
1062 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
1065 /* We used to warn about unused variables in expand_end_bindings,
1066 i.e. while generating RTL. But in function-at-a-time mode we may
1067 choose to never expand a function at all (e.g. auto inlining), so
1068 we do this explicitly now. */
1069 warn_about_unused_variables (getdecls ());
1071 /* If there were any declarations or structure tags in that level,
1072 or if this level is a function body,
1073 create a BLOCK to record them for the life of this function. */
1076 block_previously_created = (current_binding_level->this_block != 0);
1077 if (block_previously_created)
1078 block = current_binding_level->this_block;
1079 else if (keep || functionbody
1080 || (current_binding_level->keep_if_subblocks && subblocks != 0))
1081 block = make_node (BLOCK);
1084 BLOCK_VARS (block) = decls;
1085 BLOCK_SUBBLOCKS (block) = subblocks;
1088 /* In each subblock, record that this is its superior. */
1090 for (link = subblocks; link; link = TREE_CHAIN (link))
1091 BLOCK_SUPERCONTEXT (link) = block;
1093 /* Clear out the meanings of the local variables of this level. */
1095 for (link = decls; link; link = TREE_CHAIN (link))
1097 if (DECL_NAME (link) != 0)
1099 /* If the ident. was used or addressed via a local extern decl,
1100 don't forget that fact. */
1101 if (DECL_EXTERNAL (link))
1103 if (TREE_USED (link))
1104 TREE_USED (DECL_NAME (link)) = 1;
1105 if (TREE_ADDRESSABLE (link))
1106 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1108 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1112 /* Restore all name-meanings of the outer levels
1113 that were shadowed by this level. */
1115 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1116 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1118 /* If the level being exited is the top level of a function,
1119 check over all the labels, and clear out the current
1120 (function local) meanings of their names. */
1124 clear_limbo_values (block);
1126 /* If this is the top level block of a function,
1127 the vars are the function's parameters.
1128 Don't leave them in the BLOCK because they are
1129 found in the FUNCTION_DECL instead. */
1131 BLOCK_VARS (block) = 0;
1133 /* Clear out the definitions of all label names,
1134 since their scopes end here,
1135 and add them to BLOCK_VARS. */
1137 for (link = named_labels; link; link = TREE_CHAIN (link))
1139 tree label = TREE_VALUE (link);
1141 if (DECL_INITIAL (label) == 0)
1143 error_with_decl (label, "label `%s' used but not defined");
1144 /* Avoid crashing later. */
1145 define_label (input_filename, lineno,
1148 else if (warn_unused_label && !TREE_USED (label))
1149 warning_with_decl (label, "label `%s' defined but not used");
1150 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1152 /* Put the labels into the "variables" of the
1153 top-level block, so debugger can see them. */
1154 TREE_CHAIN (label) = BLOCK_VARS (block);
1155 BLOCK_VARS (block) = label;
1159 /* Pop the current level, and free the structure for reuse. */
1162 struct binding_level *level = current_binding_level;
1163 current_binding_level = current_binding_level->level_chain;
1165 level->level_chain = free_binding_level;
1166 free_binding_level = level;
1169 /* Dispose of the block that we just made inside some higher level. */
1171 DECL_INITIAL (current_function_decl) = block;
1174 if (!block_previously_created)
1175 current_binding_level->blocks
1176 = chainon (current_binding_level->blocks, block);
1178 /* If we did not make a block for the level just exited,
1179 any blocks made for inner levels
1180 (since they cannot be recorded as subblocks in that level)
1181 must be carried forward so they will later become subblocks
1182 of something else. */
1184 current_binding_level->blocks
1185 = chainon (current_binding_level->blocks, subblocks);
1187 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1188 binding contour so that they point to the appropriate construct, i.e.
1189 either to the current FUNCTION_DECL node, or else to the BLOCK node
1190 we just constructed.
1192 Note that for tagged types whose scope is just the formal parameter
1193 list for some function type specification, we can't properly set
1194 their TYPE_CONTEXTs here, because we don't have a pointer to the
1195 appropriate FUNCTION_TYPE node readily available to us. For those
1196 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1197 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1198 node which will represent the "scope" for these "parameter list local"
1202 for (link = tags; link; link = TREE_CHAIN (link))
1203 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1205 for (link = tags; link; link = TREE_CHAIN (link))
1206 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1209 TREE_USED (block) = 1;
1214 /* Insert BLOCK at the end of the list of subblocks of the
1215 current binding level. This is used when a BIND_EXPR is expanded,
1216 to handle the BLOCK node inside the BIND_EXPR. */
1219 insert_block (block)
1222 TREE_USED (block) = 1;
1223 current_binding_level->blocks
1224 = chainon (current_binding_level->blocks, block);
1227 /* Set the BLOCK node for the innermost scope
1228 (the one we are currently in). */
1234 current_binding_level->this_block = block;
1235 current_binding_level->names = chainon (current_binding_level->names,
1236 BLOCK_VARS (block));
1237 current_binding_level->blocks = chainon (current_binding_level->blocks,
1238 BLOCK_SUBBLOCKS (block));
1244 struct binding_level *newlevel;
1246 /* Reuse or create a struct for this binding level. */
1248 if (free_binding_level)
1250 newlevel = free_binding_level;
1251 free_binding_level = free_binding_level->level_chain;
1255 newlevel = make_binding_level ();
1258 /* Add this level to the front of the chain (stack) of label levels. */
1260 newlevel->level_chain = label_level_chain;
1261 label_level_chain = newlevel;
1263 newlevel->names = named_labels;
1264 newlevel->shadowed = shadowed_labels;
1266 shadowed_labels = 0;
1272 struct binding_level *level = label_level_chain;
1275 /* Clear out the definitions of the declared labels in this level.
1276 Leave in the list any ordinary, non-declared labels. */
1277 for (link = named_labels, prev = 0; link;)
1279 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1281 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1283 error_with_decl (TREE_VALUE (link),
1284 "label `%s' used but not defined");
1285 /* Avoid crashing later. */
1286 define_label (input_filename, lineno,
1287 DECL_NAME (TREE_VALUE (link)));
1289 else if (warn_unused_label && !TREE_USED (TREE_VALUE (link)))
1290 warning_with_decl (TREE_VALUE (link),
1291 "label `%s' defined but not used");
1292 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1294 /* Delete this element from the list. */
1295 link = TREE_CHAIN (link);
1297 TREE_CHAIN (prev) = link;
1299 named_labels = link;
1304 link = TREE_CHAIN (link);
1308 /* Bring back all the labels that were shadowed. */
1309 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1310 if (DECL_NAME (TREE_VALUE (link)) != 0)
1311 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1312 = TREE_VALUE (link);
1314 named_labels = chainon (named_labels, level->names);
1315 shadowed_labels = level->shadowed;
1317 /* Pop the current level, and free the structure for reuse. */
1318 label_level_chain = label_level_chain->level_chain;
1319 level->level_chain = free_binding_level;
1320 free_binding_level = level;
1323 /* Push a definition or a declaration of struct, union or enum tag "name".
1324 "type" should be the type node.
1325 We assume that the tag "name" is not already defined.
1327 Note that the definition may really be just a forward reference.
1328 In that case, the TYPE_SIZE will be zero. */
1331 pushtag (name, type)
1334 struct binding_level *b;
1336 /* Find the proper binding level for this type tag. */
1338 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1343 /* Record the identifier as the type's name if it has none. */
1345 if (TYPE_NAME (type) == 0)
1346 TYPE_NAME (type) = name;
1349 b->tags = tree_cons (name, type, b->tags);
1351 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1352 tagged type we just added to the current binding level. This fake
1353 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1354 to output a representation of a tagged type, and it also gives
1355 us a convenient place to record the "scope start" address for the
1358 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1360 /* An approximation for now, so we can tell this is a function-scope tag.
1361 This will be updated in poplevel. */
1362 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1365 /* Handle when a new declaration NEWDECL
1366 has the same name as an old one OLDDECL
1367 in the same binding contour.
1368 Prints an error message if appropriate.
1370 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1371 Otherwise, return 0.
1373 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1374 and OLDDECL is in an outer binding level and should thus not be changed. */
1377 duplicate_decls (newdecl, olddecl, different_binding_level)
1378 tree newdecl, olddecl;
1379 int different_binding_level;
1381 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1382 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1383 && DECL_INITIAL (newdecl) != 0);
1384 tree oldtype = TREE_TYPE (olddecl);
1385 tree newtype = TREE_TYPE (newdecl);
1388 if (DECL_P (olddecl))
1390 if (TREE_CODE (newdecl) == FUNCTION_DECL
1391 && TREE_CODE (olddecl) == FUNCTION_DECL
1392 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1394 if (DECL_DECLARED_INLINE_P (newdecl)
1395 && DECL_UNINLINABLE (newdecl)
1396 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1397 /* Already warned elsewhere. */;
1398 else if (DECL_DECLARED_INLINE_P (olddecl)
1399 && DECL_UNINLINABLE (olddecl)
1400 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1401 /* Already warned. */;
1402 else if (DECL_DECLARED_INLINE_P (newdecl)
1403 && ! DECL_DECLARED_INLINE_P (olddecl)
1404 && DECL_UNINLINABLE (olddecl)
1405 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1407 warning_with_decl (newdecl,
1408 "function `%s' redeclared as inline");
1409 warning_with_decl (olddecl,
1410 "previous declaration of function `%s' with attribute noinline");
1412 else if (DECL_DECLARED_INLINE_P (olddecl)
1413 && DECL_UNINLINABLE (newdecl)
1414 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1416 warning_with_decl (newdecl,
1417 "function `%s' redeclared with attribute noinline");
1418 warning_with_decl (olddecl,
1419 "previous declaration of function `%s' was inline");
1423 DECL_ATTRIBUTES (newdecl)
1424 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1427 if (TREE_CODE (newtype) == ERROR_MARK
1428 || TREE_CODE (oldtype) == ERROR_MARK)
1431 /* New decl is completely inconsistent with the old one =>
1432 tell caller to replace the old one.
1433 This is always an error except in the case of shadowing a builtin. */
1434 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1436 if (TREE_CODE (olddecl) == FUNCTION_DECL
1437 && (DECL_BUILT_IN (olddecl)
1438 || DECL_BUILT_IN_NONANSI (olddecl)))
1440 /* If you declare a built-in or predefined function name as static,
1441 the old definition is overridden,
1442 but optionally warn this was a bad choice of name. */
1443 if (!TREE_PUBLIC (newdecl))
1447 else if (DECL_BUILT_IN (olddecl))
1448 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1450 warning_with_decl (newdecl, "shadowing library function `%s'");
1452 /* Likewise, if the built-in is not ansi, then programs can
1453 override it even globally without an error. */
1454 else if (! DECL_BUILT_IN (olddecl))
1455 warning_with_decl (newdecl,
1456 "library function `%s' declared as non-function");
1458 else if (DECL_BUILT_IN_NONANSI (olddecl))
1459 warning_with_decl (newdecl,
1460 "built-in function `%s' declared as non-function");
1462 warning_with_decl (newdecl,
1463 "built-in function `%s' declared as non-function");
1467 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1468 error_with_decl (olddecl, "previous declaration of `%s'");
1474 /* For real parm decl following a forward decl,
1475 return 1 so old decl will be reused. */
1476 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1477 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1480 /* The new declaration is the same kind of object as the old one.
1481 The declarations may partially match. Print warnings if they don't
1482 match enough. Ultimately, copy most of the information from the new
1483 decl to the old one, and keep using the old one. */
1485 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1486 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1487 && DECL_INITIAL (olddecl) == 0)
1488 /* If -traditional, avoid error for redeclaring fcn
1489 after implicit decl. */
1491 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1492 && DECL_BUILT_IN (olddecl))
1494 /* A function declaration for a built-in function. */
1495 if (!TREE_PUBLIC (newdecl))
1497 /* If you declare a built-in function name as static, the
1498 built-in definition is overridden,
1499 but optionally warn this was a bad choice of name. */
1501 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1502 /* Discard the old built-in function. */
1505 else if (!types_match)
1507 /* Accept the return type of the new declaration if same modes. */
1508 tree oldreturntype = TREE_TYPE (oldtype);
1509 tree newreturntype = TREE_TYPE (newtype);
1511 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1513 /* Function types may be shared, so we can't just modify
1514 the return type of olddecl's function type. */
1516 = build_function_type (newreturntype,
1517 TYPE_ARG_TYPES (oldtype));
1518 trytype = build_type_attribute_variant (trytype,
1519 TYPE_ATTRIBUTES (oldtype));
1521 types_match = comptypes (newtype, trytype);
1525 /* Accept harmless mismatch in first argument type also.
1526 This is for the ffs and fprintf builtins. */
1527 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1528 && TYPE_ARG_TYPES (oldtype) != 0
1529 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1530 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1531 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1532 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1534 /* Function types may be shared, so we can't just modify
1535 the return type of olddecl's function type. */
1537 = build_function_type (TREE_TYPE (oldtype),
1538 tree_cons (NULL_TREE,
1539 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1540 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1541 trytype = build_type_attribute_variant (trytype,
1542 TYPE_ATTRIBUTES (oldtype));
1544 types_match = comptypes (newtype, trytype);
1548 if (! different_binding_level)
1549 TREE_TYPE (olddecl) = oldtype;
1553 /* If types don't match for a built-in, throw away the built-in. */
1554 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1558 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1559 && DECL_SOURCE_LINE (olddecl) == 0)
1561 /* A function declaration for a predeclared function
1562 that isn't actually built in. */
1563 if (!TREE_PUBLIC (newdecl))
1565 /* If you declare it as static, the
1566 default definition is overridden. */
1569 else if (!types_match)
1571 /* If the types don't match, preserve volatility indication.
1572 Later on, we will discard everything else about the
1573 default declaration. */
1574 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1577 /* Permit char *foo () to match void *foo (...) if not pedantic,
1578 if one of them came from a system header file. */
1579 else if (!types_match
1580 && TREE_CODE (olddecl) == FUNCTION_DECL
1581 && TREE_CODE (newdecl) == FUNCTION_DECL
1582 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1583 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1584 && (DECL_IN_SYSTEM_HEADER (olddecl)
1585 || DECL_IN_SYSTEM_HEADER (newdecl))
1586 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1587 && TYPE_ARG_TYPES (oldtype) == 0
1588 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1589 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1591 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1592 && TYPE_ARG_TYPES (newtype) == 0
1593 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1594 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1597 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1598 /* Make sure we keep void * as ret type, not char *. */
1599 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1600 TREE_TYPE (newdecl) = newtype = oldtype;
1602 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1603 we will come back here again. */
1604 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1606 else if (!types_match
1607 /* Permit char *foo (int, ...); followed by char *foo ();
1609 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1611 /* Return types must still match. */
1612 && comptypes (TREE_TYPE (oldtype),
1613 TREE_TYPE (newtype))
1614 && TYPE_ARG_TYPES (newtype) == 0))
1616 error_with_decl (newdecl, "conflicting types for `%s'");
1617 /* Check for function type mismatch
1618 involving an empty arglist vs a nonempty one. */
1619 if (TREE_CODE (olddecl) == FUNCTION_DECL
1620 && comptypes (TREE_TYPE (oldtype),
1621 TREE_TYPE (newtype))
1622 && ((TYPE_ARG_TYPES (oldtype) == 0
1623 && DECL_INITIAL (olddecl) == 0)
1625 (TYPE_ARG_TYPES (newtype) == 0
1626 && DECL_INITIAL (newdecl) == 0)))
1628 /* Classify the problem further. */
1629 tree t = TYPE_ARG_TYPES (oldtype);
1631 t = TYPE_ARG_TYPES (newtype);
1632 for (; t; t = TREE_CHAIN (t))
1634 tree type = TREE_VALUE (t);
1636 if (TREE_CHAIN (t) == 0
1637 && TYPE_MAIN_VARIANT (type) != void_type_node)
1639 error ("A parameter list with an ellipsis can't match an empty parameter name list declaration.");
1643 if (simple_type_promotes_to (type) != NULL_TREE)
1645 error ("An argument type that has a default promotion can't match an empty parameter name list declaration.");
1650 error_with_decl (olddecl, "previous declaration of `%s'");
1654 errmsg = redeclaration_error_message (newdecl, olddecl);
1660 error_with_decl (newdecl, "redefinition of `%s'");
1663 error_with_decl (newdecl, "redeclaration of `%s'");
1666 error_with_decl (newdecl, "conflicting declarations of `%s'");
1672 error_with_decl (olddecl,
1673 ((DECL_INITIAL (olddecl)
1674 && current_binding_level == global_binding_level)
1675 ? "`%s' previously defined here"
1676 : "`%s' previously declared here"));
1678 else if (TREE_CODE (newdecl) == TYPE_DECL
1679 && (DECL_IN_SYSTEM_HEADER (olddecl)
1680 || DECL_IN_SYSTEM_HEADER (newdecl)))
1682 warning_with_decl (newdecl, "redefinition of `%s'");
1685 ((DECL_INITIAL (olddecl)
1686 && current_binding_level == global_binding_level)
1687 ? "`%s' previously defined here"
1688 : "`%s' previously declared here"));
1690 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1691 && DECL_INITIAL (olddecl) != 0
1692 && TYPE_ARG_TYPES (oldtype) == 0
1693 && TYPE_ARG_TYPES (newtype) != 0
1694 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1698 /* Prototype decl follows defn w/o prototype. */
1700 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1701 type = TYPE_ARG_TYPES (newtype),
1704 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1706 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1707 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1709 warning_with_decl (newdecl, "prototype for `%s' follows");
1710 warning_with_decl (olddecl, "non-prototype definition here");
1713 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1714 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1716 error_with_decl (newdecl,
1717 "prototype for `%s' follows and number of arguments doesn't match");
1718 error_with_decl (olddecl, "non-prototype definition here");
1722 /* Type for passing arg must be consistent
1723 with that declared for the arg. */
1724 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1725 /* If -traditional, allow `unsigned int' instead of `int'
1726 in the prototype. */
1727 && (! (flag_traditional
1728 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1729 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1731 error_with_decl (newdecl,
1732 "prototype for `%s' follows and argument %d doesn't match",
1734 error_with_decl (olddecl, "non-prototype definition here");
1740 /* Warn about mismatches in various flags. */
1743 /* Warn if function is now inline
1744 but was previously declared not inline and has been called. */
1745 if (TREE_CODE (olddecl) == FUNCTION_DECL
1746 && ! DECL_DECLARED_INLINE_P (olddecl)
1747 && DECL_DECLARED_INLINE_P (newdecl)
1748 && TREE_USED (olddecl))
1749 warning_with_decl (newdecl,
1750 "`%s' declared inline after being called");
1751 if (TREE_CODE (olddecl) == FUNCTION_DECL
1752 && ! DECL_DECLARED_INLINE_P (olddecl)
1753 && DECL_DECLARED_INLINE_P (newdecl)
1754 && DECL_INITIAL (olddecl) != 0)
1755 warning_with_decl (newdecl,
1756 "`%s' declared inline after its definition");
1758 /* If pedantic, warn when static declaration follows a non-static
1759 declaration. Otherwise, do so only for functions. */
1760 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1761 && TREE_PUBLIC (olddecl)
1762 && !TREE_PUBLIC (newdecl))
1763 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1765 /* If warn_traditional, warn when a non-static function
1766 declaration follows a static one. */
1767 if (warn_traditional && !in_system_header
1768 && TREE_CODE (olddecl) == FUNCTION_DECL
1769 && !TREE_PUBLIC (olddecl)
1770 && TREE_PUBLIC (newdecl))
1771 warning_with_decl (newdecl, "non-static declaration for `%s' follows static");
1773 /* Warn when const declaration follows a non-const
1774 declaration, but not for functions. */
1775 if (TREE_CODE (olddecl) != FUNCTION_DECL
1776 && !TREE_READONLY (olddecl)
1777 && TREE_READONLY (newdecl))
1778 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1779 /* These bits are logically part of the type, for variables.
1780 But not for functions
1781 (where qualifiers are not valid ANSI anyway). */
1782 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1783 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1784 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1785 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1789 /* Optionally warn about more than one declaration for the same name. */
1790 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1791 /* Don't warn about a function declaration
1792 followed by a definition. */
1793 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1794 && DECL_INITIAL (olddecl) == 0)
1795 /* Don't warn about extern decl followed by (tentative) definition. */
1796 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1798 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1799 warning_with_decl (olddecl, "previous declaration of `%s'");
1802 /* Copy all the DECL_... slots specified in the new decl
1803 except for any that we copy here from the old type.
1805 Past this point, we don't change OLDTYPE and NEWTYPE
1806 even if we change the types of NEWDECL and OLDDECL. */
1810 /* When copying info to olddecl, we store into write_olddecl
1811 instead. This allows us to avoid modifying olddecl when
1812 different_binding_level is true. */
1813 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1815 /* Merge the data types specified in the two decls. */
1816 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1818 if (different_binding_level)
1820 if (TYPE_ARG_TYPES (oldtype) != 0
1821 && TYPE_ARG_TYPES (newtype) == 0)
1822 TREE_TYPE (newdecl) = common_type (newtype, oldtype);
1825 = build_type_attribute_variant
1827 merge_attributes (TYPE_ATTRIBUTES (newtype),
1828 TYPE_ATTRIBUTES (oldtype)));
1832 = TREE_TYPE (olddecl)
1833 = common_type (newtype, oldtype);
1836 /* Lay the type out, unless already done. */
1837 if (oldtype != TREE_TYPE (newdecl))
1839 if (TREE_TYPE (newdecl) != error_mark_node)
1840 layout_type (TREE_TYPE (newdecl));
1841 if (TREE_CODE (newdecl) != FUNCTION_DECL
1842 && TREE_CODE (newdecl) != TYPE_DECL
1843 && TREE_CODE (newdecl) != CONST_DECL)
1844 layout_decl (newdecl, 0);
1848 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1849 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1850 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1851 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1852 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1853 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1855 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1856 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1860 /* Keep the old rtl since we can safely use it. */
1861 COPY_DECL_RTL (olddecl, newdecl);
1863 /* Merge the type qualifiers. */
1864 if (TREE_CODE (olddecl) == FUNCTION_DECL
1865 && DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1866 && ! TREE_THIS_VOLATILE (newdecl))
1867 TREE_THIS_VOLATILE (write_olddecl) = 0;
1869 if (TREE_READONLY (newdecl))
1870 TREE_READONLY (write_olddecl) = 1;
1872 if (TREE_THIS_VOLATILE (newdecl))
1874 TREE_THIS_VOLATILE (write_olddecl) = 1;
1875 if (TREE_CODE (newdecl) == VAR_DECL
1876 /* If an automatic variable is re-declared in the same
1877 function scope, but the old declaration was not
1878 volatile, make_var_volatile() would crash because the
1879 variable would have been assigned to a pseudo, not a
1880 MEM. Since this duplicate declaration is invalid
1881 anyway, we just skip the call. */
1883 make_var_volatile (newdecl);
1886 /* Keep source location of definition rather than declaration. */
1887 /* When called with different_binding_level set, keep the old
1888 information so that meaningful diagnostics can be given. */
1889 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1890 && ! different_binding_level)
1892 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1893 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1896 /* Merge the unused-warning information. */
1897 if (DECL_IN_SYSTEM_HEADER (olddecl))
1898 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1899 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1900 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1902 /* Merge the initialization information. */
1903 /* When called with different_binding_level set, don't copy over
1904 DECL_INITIAL, so that we don't accidentally change function
1905 declarations into function definitions. */
1906 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1907 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1909 /* Merge the section attribute.
1910 We want to issue an error if the sections conflict but that must be
1911 done later in decl_attributes since we are called before attributes
1913 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1914 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1916 /* Copy the assembler name.
1917 Currently, it can only be defined in the prototype. */
1918 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1920 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1922 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1923 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1925 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1926 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1927 DECL_NO_CHECK_MEMORY_USAGE (newdecl)
1928 |= DECL_NO_CHECK_MEMORY_USAGE (olddecl);
1929 DECL_NO_LIMIT_STACK (newdecl)
1930 |= DECL_NO_LIMIT_STACK (olddecl);
1933 /* If cannot merge, then use the new type and qualifiers,
1934 and don't preserve the old rtl. */
1935 else if (! different_binding_level)
1937 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1938 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1939 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1940 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1943 /* Merge the storage class information. */
1944 DECL_WEAK (newdecl) |= DECL_WEAK (olddecl);
1945 /* For functions, static overrides non-static. */
1946 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1948 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1949 /* This is since we don't automatically
1950 copy the attributes of NEWDECL into OLDDECL. */
1951 /* No need to worry about different_binding_level here because
1952 then TREE_PUBLIC (newdecl) was true. */
1953 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1954 /* If this clears `static', clear it in the identifier too. */
1955 if (! TREE_PUBLIC (olddecl))
1956 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1958 if (DECL_EXTERNAL (newdecl))
1960 if (! different_binding_level)
1962 /* Don't mess with these flags on local externs; they remain
1963 external even if there's a declaration at file scope which
1965 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1966 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1968 /* An extern decl does not override previous storage class. */
1969 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1970 if (! DECL_EXTERNAL (newdecl))
1971 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1975 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1976 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1979 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1981 /* If we're redefining a function previously defined as extern
1982 inline, make sure we emit debug info for the inline before we
1983 throw it away, in case it was inlined into a function that hasn't
1984 been written out yet. */
1985 if (new_is_definition && DECL_INITIAL (olddecl) && TREE_USED (olddecl))
1987 (*debug_hooks->outlining_inline_function) (olddecl);
1989 /* The new defn must not be inline. */
1990 DECL_INLINE (newdecl) = 0;
1991 DECL_UNINLINABLE (newdecl) = 1;
1995 /* If either decl says `inline', this fn is inline,
1996 unless its definition was passed already. */
1997 if (DECL_DECLARED_INLINE_P (newdecl)
1998 && DECL_DECLARED_INLINE_P (olddecl) == 0)
1999 DECL_DECLARED_INLINE_P (olddecl) = 1;
2001 DECL_DECLARED_INLINE_P (newdecl) = DECL_DECLARED_INLINE_P (olddecl);
2003 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
2004 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
2007 if (DECL_BUILT_IN (olddecl))
2009 /* Get rid of any built-in function if new arg types don't match it
2010 or if we have a function definition. */
2011 if (! types_match || new_is_definition)
2013 if (! different_binding_level)
2015 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
2016 DECL_BUILT_IN_CLASS (olddecl) = NOT_BUILT_IN;
2021 /* If redeclaring a builtin function, and not a definition,
2022 it stays built in. */
2023 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2024 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2027 /* Also preserve various other info from the definition. */
2028 else if (! new_is_definition)
2029 DECL_NUM_STMTS (newdecl) = DECL_NUM_STMTS (olddecl);
2030 if (! new_is_definition)
2032 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2033 /* When called with different_binding_level set, don't copy over
2034 DECL_INITIAL, so that we don't accidentally change function
2035 declarations into function definitions. */
2036 if (! different_binding_level)
2037 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2038 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
2039 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2040 if (DECL_INLINE (newdecl))
2041 DECL_ABSTRACT_ORIGIN (newdecl) = DECL_ABSTRACT_ORIGIN (olddecl);
2044 if (different_binding_level)
2047 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2048 But preserve OLDDECL's DECL_UID. */
2050 unsigned olddecl_uid = DECL_UID (olddecl);
2052 memcpy ((char *) olddecl + sizeof (struct tree_common),
2053 (char *) newdecl + sizeof (struct tree_common),
2054 sizeof (struct tree_decl) - sizeof (struct tree_common));
2055 DECL_UID (olddecl) = olddecl_uid;
2058 /* NEWDECL contains the merged attribute lists.
2059 Update OLDDECL to be the same. */
2060 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2065 /* Record a decl-node X as belonging to the current lexical scope.
2066 Check for errors (such as an incompatible declaration for the same
2067 name already seen in the same scope).
2069 Returns either X or an old decl for the same name.
2070 If an old decl is returned, it may have been smashed
2071 to agree with what X says. */
2078 tree name = DECL_NAME (x);
2079 struct binding_level *b = current_binding_level;
2081 /* Functions need the lang_decl data. */
2082 if (TREE_CODE (x) == FUNCTION_DECL && ! DECL_LANG_SPECIFIC (x))
2083 DECL_LANG_SPECIFIC (x) = (struct lang_decl *)
2084 ggc_alloc_cleared (sizeof (struct lang_decl));
2086 DECL_CONTEXT (x) = current_function_decl;
2087 /* A local extern declaration for a function doesn't constitute nesting.
2088 A local auto declaration does, since it's a forward decl
2089 for a nested function coming later. */
2090 if ((TREE_CODE (x) == FUNCTION_DECL || TREE_CODE (x) == VAR_DECL)
2091 && DECL_INITIAL (x) == 0 && DECL_EXTERNAL (x))
2092 DECL_CONTEXT (x) = 0;
2096 int different_binding_level = 0;
2098 if (warn_nested_externs
2099 && DECL_EXTERNAL (x)
2100 && b != global_binding_level
2101 && x != IDENTIFIER_IMPLICIT_DECL (name)
2102 /* No error messages for __FUNCTION__ and __PRETTY_FUNCTION__. */
2103 && !DECL_IN_SYSTEM_HEADER (x))
2104 warning ("nested extern declaration of `%s'",
2105 IDENTIFIER_POINTER (name));
2107 t = lookup_name_current_level (name);
2108 /* Don't type check externs here when -traditional. This is so that
2109 code with conflicting declarations inside blocks will get warnings
2110 not errors. X11 for instance depends on this. */
2111 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
2113 t = lookup_name (name);
2114 /* Type decls at global scope don't conflict with externs declared
2115 inside lexical blocks. */
2116 if (t && TREE_CODE (t) == TYPE_DECL)
2118 different_binding_level = 1;
2120 if (t != 0 && t == error_mark_node)
2121 /* error_mark_node is 0 for a while during initialization! */
2124 error_with_decl (x, "`%s' used prior to declaration");
2127 /* If this decl is `static' and an implicit decl was seen previously,
2128 warn. But don't complain if -traditional,
2129 since traditional compilers don't complain. */
2130 if (! flag_traditional && TREE_PUBLIC (name)
2131 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2132 sets this for all functions. */
2133 && ! TREE_PUBLIC (x)
2134 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2135 /* We used to warn also for explicit extern followed by static,
2136 but sometimes you need to do it that way. */
2137 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2139 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2140 IDENTIFIER_POINTER (name));
2141 pedwarn_with_file_and_line
2142 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2143 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2144 "previous declaration of `%s'",
2145 IDENTIFIER_POINTER (name));
2146 TREE_THIS_VOLATILE (name) = 1;
2149 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2151 if (TREE_CODE (t) == PARM_DECL)
2153 /* Don't allow more than one "real" duplicate
2154 of a forward parm decl. */
2155 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2161 /* If we are processing a typedef statement, generate a whole new
2162 ..._TYPE node (which will be just an variant of the existing
2163 ..._TYPE node with identical properties) and then install the
2164 TYPE_DECL node generated to represent the typedef name as the
2165 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2167 The whole point here is to end up with a situation where each
2168 and every ..._TYPE node the compiler creates will be uniquely
2169 associated with AT MOST one node representing a typedef name.
2170 This way, even though the compiler substitutes corresponding
2171 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2172 early on, later parts of the compiler can always do the reverse
2173 translation and get back the corresponding typedef name. For
2176 typedef struct S MY_TYPE;
2179 Later parts of the compiler might only know that `object' was of
2180 type `struct S' if it were not for code just below. With this
2181 code however, later parts of the compiler see something like:
2183 struct S' == struct S
2184 typedef struct S' MY_TYPE;
2187 And they can then deduce (from the node for type struct S') that
2188 the original object declaration was:
2192 Being able to do this is important for proper support of protoize,
2193 and also for generating precise symbolic debugging information
2194 which takes full account of the programmer's (typedef) vocabulary.
2196 Obviously, we don't want to generate a duplicate ..._TYPE node if
2197 the TYPE_DECL node that we are now processing really represents a
2198 standard built-in type.
2200 Since all standard types are effectively declared at line zero
2201 in the source file, we can easily check to see if we are working
2202 on a standard type by checking the current value of lineno. */
2204 if (TREE_CODE (x) == TYPE_DECL)
2206 if (DECL_SOURCE_LINE (x) == 0)
2208 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2209 TYPE_NAME (TREE_TYPE (x)) = x;
2211 else if (TREE_TYPE (x) != error_mark_node
2212 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2214 tree tt = TREE_TYPE (x);
2215 DECL_ORIGINAL_TYPE (x) = tt;
2216 tt = build_type_copy (tt);
2218 TREE_USED (tt) = TREE_USED (x);
2223 /* Multiple external decls of the same identifier ought to match.
2224 Check against both global declarations (when traditional) and out of
2225 scope (limbo) block level declarations.
2227 We get warnings about inline functions where they are defined.
2228 Avoid duplicate warnings where they are used. */
2230 && ! (TREE_CODE (x) == FUNCTION_DECL && DECL_INLINE (x)))
2234 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2235 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2236 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2237 decl = IDENTIFIER_GLOBAL_VALUE (name);
2238 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2239 /* Decls in limbo are always extern, so no need to check that. */
2240 decl = IDENTIFIER_LIMBO_VALUE (name);
2244 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2245 /* If old decl is built-in, we already warned if we should. */
2246 && !DECL_BUILT_IN (decl))
2248 pedwarn_with_decl (x,
2249 "type mismatch with previous external decl");
2250 pedwarn_with_decl (decl, "previous external decl of `%s'");
2254 /* If a function has had an implicit declaration, and then is defined,
2255 make sure they are compatible. */
2257 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2258 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2259 && TREE_CODE (x) == FUNCTION_DECL
2260 && ! comptypes (TREE_TYPE (x),
2261 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2263 warning_with_decl (x, "type mismatch with previous implicit declaration");
2264 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2265 "previous implicit declaration of `%s'");
2268 /* In PCC-compatibility mode, extern decls of vars with no current decl
2269 take effect at top level no matter where they are. */
2270 if (flag_traditional && DECL_EXTERNAL (x)
2271 && lookup_name (name) == 0)
2273 tree type = TREE_TYPE (x);
2275 /* But don't do this if the type contains temporary nodes. */
2278 if (type == error_mark_node)
2280 if (TYPE_CONTEXT (type))
2282 warning_with_decl (x, "type of external `%s' is not global");
2283 /* By exiting the loop early, we leave TYPE nonzero,
2284 and thus prevent globalization of the decl. */
2287 else if (TREE_CODE (type) == FUNCTION_TYPE
2288 && TYPE_ARG_TYPES (type) != 0)
2289 /* The types might not be truly local,
2290 but the list of arg types certainly is temporary.
2291 Since prototypes are nontraditional,
2292 ok not to do the traditional thing. */
2294 type = TREE_TYPE (type);
2298 b = global_binding_level;
2301 /* This name is new in its binding level.
2302 Install the new declaration and return it. */
2303 if (b == global_binding_level)
2305 /* Install a global value. */
2307 /* If the first global decl has external linkage,
2308 warn if we later see static one. */
2309 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2310 TREE_PUBLIC (name) = 1;
2312 IDENTIFIER_GLOBAL_VALUE (name) = x;
2314 /* We no longer care about any previous block level declarations. */
2315 IDENTIFIER_LIMBO_VALUE (name) = 0;
2317 /* Don't forget if the function was used via an implicit decl. */
2318 if (IDENTIFIER_IMPLICIT_DECL (name)
2319 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2320 TREE_USED (x) = 1, TREE_USED (name) = 1;
2322 /* Don't forget if its address was taken in that way. */
2323 if (IDENTIFIER_IMPLICIT_DECL (name)
2324 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2325 TREE_ADDRESSABLE (x) = 1;
2327 /* Warn about mismatches against previous implicit decl. */
2328 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2329 /* If this real decl matches the implicit, don't complain. */
2330 && ! (TREE_CODE (x) == FUNCTION_DECL
2331 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2332 == integer_type_node)))
2333 pedwarn ("`%s' was previously implicitly declared to return `int'",
2334 IDENTIFIER_POINTER (name));
2336 /* If this decl is `static' and an `extern' was seen previously,
2337 that is erroneous. */
2338 if (TREE_PUBLIC (name)
2339 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2341 /* Okay to redeclare an ANSI built-in as static. */
2342 if (t != 0 && DECL_BUILT_IN (t))
2344 /* Okay to declare a non-ANSI built-in as anything. */
2345 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2347 /* Okay to have global type decl after an earlier extern
2348 declaration inside a lexical block. */
2349 else if (TREE_CODE (x) == TYPE_DECL)
2351 else if (IDENTIFIER_IMPLICIT_DECL (name))
2353 if (! TREE_THIS_VOLATILE (name))
2354 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2355 IDENTIFIER_POINTER (name));
2358 pedwarn ("`%s' was declared `extern' and later `static'",
2359 IDENTIFIER_POINTER (name));
2364 /* Here to install a non-global value. */
2365 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2366 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2368 IDENTIFIER_LOCAL_VALUE (name) = x;
2370 /* If this is an extern function declaration, see if we
2371 have a global definition or declaration for the function. */
2374 && TREE_CODE (x) == FUNCTION_DECL
2375 && TREE_CODE (oldglobal) == FUNCTION_DECL
2376 && DECL_EXTERNAL (x)
2377 && ! DECL_DECLARED_INLINE_P (x))
2379 /* We have one. Their types must agree. */
2380 if (! comptypes (TREE_TYPE (x),
2381 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2382 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2385 /* Inner extern decl is inline if global one is.
2386 Copy enough to really inline it. */
2387 if (DECL_DECLARED_INLINE_P (oldglobal))
2389 DECL_DECLARED_INLINE_P (x)
2390 = DECL_DECLARED_INLINE_P (oldglobal);
2391 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2392 DECL_INITIAL (x) = (current_function_decl == oldglobal
2393 ? 0 : DECL_INITIAL (oldglobal));
2394 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2395 DECL_NUM_STMTS (x) = DECL_NUM_STMTS (oldglobal);
2396 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2397 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2398 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2399 DECL_ABSTRACT_ORIGIN (x)
2400 = DECL_ABSTRACT_ORIGIN (oldglobal);
2402 /* Inner extern decl is built-in if global one is. */
2403 if (DECL_BUILT_IN (oldglobal))
2405 DECL_BUILT_IN_CLASS (x) = DECL_BUILT_IN_CLASS (oldglobal);
2406 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2408 /* Keep the arg types from a file-scope fcn defn. */
2409 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2410 && DECL_INITIAL (oldglobal)
2411 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2412 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2417 /* This case is probably sometimes the right thing to do. */
2418 /* If we have a local external declaration,
2419 then any file-scope declaration should not
2420 have been static. */
2421 if (oldlocal == 0 && oldglobal != 0
2422 && !TREE_PUBLIC (oldglobal)
2423 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2424 warning ("`%s' locally external but globally static",
2425 IDENTIFIER_POINTER (name));
2428 /* If we have a local external declaration,
2429 and no file-scope declaration has yet been seen,
2430 then if we later have a file-scope decl it must not be static. */
2432 && DECL_EXTERNAL (x)
2436 TREE_PUBLIC (name) = 1;
2438 /* Save this decl, so that we can do type checking against
2439 other decls after it falls out of scope.
2441 Only save it once. This prevents temporary decls created in
2442 expand_inline_function from being used here, since this
2443 will have been set when the inline function was parsed.
2444 It also helps give slightly better warnings. */
2445 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2446 IDENTIFIER_LIMBO_VALUE (name) = x;
2449 /* Warn if shadowing an argument at the top level of the body. */
2450 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2451 /* This warning doesn't apply to the parms of a nested fcn. */
2452 && ! current_binding_level->parm_flag
2453 /* Check that this is one level down from the parms. */
2454 && current_binding_level->level_chain->parm_flag
2455 /* Check that the decl being shadowed
2456 comes from the parm level, one level up. */
2457 && chain_member (oldlocal, current_binding_level->level_chain->names))
2459 if (TREE_CODE (oldlocal) == PARM_DECL)
2460 pedwarn ("declaration of `%s' shadows a parameter",
2461 IDENTIFIER_POINTER (name));
2463 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2464 IDENTIFIER_POINTER (name));
2467 /* Maybe warn if shadowing something else. */
2468 else if (warn_shadow && !DECL_EXTERNAL (x)
2469 /* No shadow warnings for internally generated vars. */
2470 && DECL_SOURCE_LINE (x) != 0
2471 /* No shadow warnings for vars made for inlining. */
2472 && ! DECL_FROM_INLINE (x))
2474 const char *id = IDENTIFIER_POINTER (name);
2476 if (TREE_CODE (x) == PARM_DECL
2477 && current_binding_level->level_chain->parm_flag)
2478 /* Don't warn about the parm names in function declarator
2479 within a function declarator.
2480 It would be nice to avoid warning in any function
2481 declarator in a declaration, as opposed to a definition,
2482 but there is no way to tell it's not a definition. */
2484 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2485 warning ("declaration of `%s' shadows a parameter", id);
2486 else if (oldlocal != 0)
2487 warning ("declaration of `%s' shadows previous local", id);
2488 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2489 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2490 warning ("declaration of `%s' shadows global declaration", id);
2493 /* If storing a local value, there may already be one (inherited).
2494 If so, record it for restoration when this binding level ends. */
2496 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2499 /* Keep count of variables in this level with incomplete type.
2500 If the input is erroneous, we can have error_mark in the type
2501 slot (e.g. "f(void a, ...)") - that doesn't count as an
2503 if (TREE_TYPE (x) != error_mark_node
2504 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2508 /* Put decls on list in reverse order.
2509 We will reverse them later if necessary. */
2510 TREE_CHAIN (x) = b->names;
2516 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2519 pushdecl_top_level (x)
2523 struct binding_level *b = current_binding_level;
2525 current_binding_level = global_binding_level;
2527 current_binding_level = b;
2531 /* Generate an implicit declaration for identifier FUNCTIONID
2532 as a function of type int (). Print a warning if appropriate. */
2535 implicitly_declare (functionid)
2539 int traditional_warning = 0;
2540 /* Only one "implicit declaration" warning per identifier. */
2541 int implicit_warning;
2543 /* We used to reuse an old implicit decl here,
2544 but this loses with inline functions because it can clobber
2545 the saved decl chains. */
2547 if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2548 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2551 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2553 /* Warn of implicit decl following explicit local extern decl.
2554 This is probably a program designed for traditional C. */
2555 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2556 traditional_warning = 1;
2558 /* Warn once of an implicit declaration. */
2559 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2561 DECL_EXTERNAL (decl) = 1;
2562 TREE_PUBLIC (decl) = 1;
2564 /* Record that we have an implicit decl and this is it. */
2565 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2567 /* ANSI standard says implicit declarations are in the innermost block.
2568 So we record the decl in the standard fashion.
2569 If flag_traditional is set, pushdecl does it top-level. */
2572 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2573 maybe_objc_check_decl (decl);
2575 rest_of_decl_compilation (decl, NULL, 0, 0);
2577 if (implicit_warning)
2578 implicit_decl_warning (functionid);
2579 else if (warn_traditional && traditional_warning)
2580 warning ("function `%s' was previously declared within a block",
2581 IDENTIFIER_POINTER (functionid));
2583 /* Write a record describing this implicit function declaration to the
2584 prototypes file (if requested). */
2586 gen_aux_info_record (decl, 0, 1, 0);
2588 /* Possibly apply some default attributes to this implicit declaration. */
2589 decl_attributes (&decl, NULL_TREE, 0);
2595 implicit_decl_warning (id)
2598 const char *name = IDENTIFIER_POINTER (id);
2599 if (mesg_implicit_function_declaration == 2)
2600 error ("implicit declaration of function `%s'", name);
2601 else if (mesg_implicit_function_declaration == 1)
2602 warning ("implicit declaration of function `%s'", name);
2605 /* Return zero if the declaration NEWDECL is valid
2606 when the declaration OLDDECL (assumed to be for the same name)
2607 has already been seen.
2608 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
2609 and 3 if it is a conflicting declaration. */
2612 redeclaration_error_message (newdecl, olddecl)
2613 tree newdecl, olddecl;
2615 if (TREE_CODE (newdecl) == TYPE_DECL)
2617 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2619 /* pushdecl creates distinct types for TYPE_DECLs by calling
2620 build_type_copy, so the above comparison generally fails. We do
2621 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2622 is equivalent to what this code used to do before the build_type_copy
2623 call. The variant type distinction should not matter for traditional
2624 code, because it doesn't have type qualifiers. */
2625 if (flag_traditional
2626 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
2628 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2632 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2634 /* Declarations of functions can insist on internal linkage
2635 but they can't be inconsistent with internal linkage,
2636 so there can be no error on that account.
2637 However defining the same name twice is no good. */
2638 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2639 /* However, defining once as extern inline and a second
2640 time in another way is ok. */
2641 && ! (DECL_DECLARED_INLINE_P (olddecl) && DECL_EXTERNAL (olddecl)
2642 && ! (DECL_DECLARED_INLINE_P (newdecl)
2643 && DECL_EXTERNAL (newdecl))))
2647 else if (DECL_CONTEXT (newdecl) == NULL_TREE)
2649 /* Objects declared at top level: */
2650 /* If at least one is a reference, it's ok. */
2651 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2653 /* Reject two definitions. */
2654 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2656 /* Now we have two tentative defs, or one tentative and one real def. */
2657 /* Insist that the linkage match. */
2658 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2662 else if (current_binding_level->parm_flag
2663 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2667 /* Newdecl has block scope. If olddecl has block scope also, then
2668 reject two definitions, and reject a definition together with an
2669 external reference. Otherwise, it is OK, because newdecl must
2670 be an extern reference to olddecl. */
2671 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2672 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2678 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2679 Create one if none exists so far for the current function.
2680 This function is called for both label definitions and label references. */
2686 tree decl = IDENTIFIER_LABEL_VALUE (id);
2688 if (current_function_decl == 0)
2690 error ("label %s referenced outside of any function",
2691 IDENTIFIER_POINTER (id));
2695 /* Use a label already defined or ref'd with this name. */
2698 /* But not if it is inherited and wasn't declared to be inheritable. */
2699 if (DECL_CONTEXT (decl) != current_function_decl
2700 && ! C_DECLARED_LABEL_FLAG (decl))
2701 return shadow_label (id);
2705 decl = build_decl (LABEL_DECL, id, void_type_node);
2707 /* A label not explicitly declared must be local to where it's ref'd. */
2708 DECL_CONTEXT (decl) = current_function_decl;
2710 DECL_MODE (decl) = VOIDmode;
2712 /* Say where one reference is to the label,
2713 for the sake of the error if it is not defined. */
2714 DECL_SOURCE_LINE (decl) = lineno;
2715 DECL_SOURCE_FILE (decl) = input_filename;
2717 IDENTIFIER_LABEL_VALUE (id) = decl;
2719 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2724 /* Make a label named NAME in the current function,
2725 shadowing silently any that may be inherited from containing functions
2726 or containing scopes.
2728 Note that valid use, if the label being shadowed
2729 comes from another scope in the same function,
2730 requires calling declare_nonlocal_label right away. */
2736 tree decl = IDENTIFIER_LABEL_VALUE (name);
2742 /* Check to make sure that the label hasn't already been declared
2743 at this label scope */
2744 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2745 if (TREE_VALUE (dup) == decl)
2747 error ("duplicate label declaration `%s'",
2748 IDENTIFIER_POINTER (name));
2749 error_with_decl (TREE_VALUE (dup),
2750 "this is a previous declaration");
2751 /* Just use the previous declaration. */
2752 return lookup_label (name);
2755 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2756 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2759 return lookup_label (name);
2762 /* Define a label, specifying the location in the source file.
2763 Return the LABEL_DECL node for the label, if the definition is valid.
2764 Otherwise return 0. */
2767 define_label (filename, line, name)
2768 const char *filename;
2772 tree decl = lookup_label (name);
2774 /* If label with this name is known from an outer context, shadow it. */
2775 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2777 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2778 IDENTIFIER_LABEL_VALUE (name) = 0;
2779 decl = lookup_label (name);
2782 if (warn_traditional && !in_system_header && lookup_name (name))
2783 warning_with_file_and_line (filename, line,
2784 "traditional C lacks a separate namespace for labels, identifier `%s' conflicts",
2785 IDENTIFIER_POINTER (name));
2787 if (DECL_INITIAL (decl) != 0)
2789 error_with_file_and_line (filename, line, "duplicate label `%s'",
2790 IDENTIFIER_POINTER (name));
2795 /* Mark label as having been defined. */
2796 DECL_INITIAL (decl) = error_mark_node;
2797 /* Say where in the source. */
2798 DECL_SOURCE_FILE (decl) = filename;
2799 DECL_SOURCE_LINE (decl) = line;
2804 /* Return the list of declarations of the current level.
2805 Note that this list is in reverse order unless/until
2806 you nreverse it; and when you do nreverse it, you must
2807 store the result back using `storedecls' or you will lose. */
2812 return current_binding_level->names;
2815 /* Return the list of type-tags (for structs, etc) of the current level. */
2820 return current_binding_level->tags;
2823 /* Store the list of declarations of the current level.
2824 This is done for the parameter declarations of a function being defined,
2825 after they are modified in the light of any missing parameters. */
2831 current_binding_level->names = decls;
2834 /* Similarly, store the list of tags of the current level. */
2840 current_binding_level->tags = tags;
2843 /* Given NAME, an IDENTIFIER_NODE,
2844 return the structure (or union or enum) definition for that name.
2845 Searches binding levels from BINDING_LEVEL up to the global level.
2846 If THISLEVEL_ONLY is nonzero, searches only the specified context
2847 (but skips any tag-transparent contexts to find one that is
2848 meaningful for tags).
2849 CODE says which kind of type the caller wants;
2850 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2851 If the wrong kind of type is found, an error is reported. */
2854 lookup_tag (code, name, binding_level, thislevel_only)
2855 enum tree_code code;
2856 struct binding_level *binding_level;
2860 struct binding_level *level;
2863 for (level = binding_level; level; level = level->level_chain)
2866 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2868 if (TREE_PURPOSE (tail) == name)
2870 if (TREE_CODE (TREE_VALUE (tail)) != code)
2872 /* Definition isn't the kind we were looking for. */
2873 pending_invalid_xref = name;
2874 pending_invalid_xref_file = input_filename;
2875 pending_invalid_xref_line = lineno;
2876 /* If in the same binding level as a declaration as a tag
2877 of a different type, this must not be allowed to
2878 shadow that tag, so give the error immediately.
2879 (For example, "struct foo; union foo;" is invalid.) */
2881 pending_xref_error ();
2883 return TREE_VALUE (tail);
2886 if (! level->tag_transparent)
2896 /* Print an error message now
2897 for a recent invalid struct, union or enum cross reference.
2898 We don't print them immediately because they are not invalid
2899 when used in the `struct foo;' construct for shadowing. */
2902 pending_xref_error ()
2904 if (pending_invalid_xref != 0)
2905 error_with_file_and_line (pending_invalid_xref_file,
2906 pending_invalid_xref_line,
2907 "`%s' defined as wrong kind of tag",
2908 IDENTIFIER_POINTER (pending_invalid_xref));
2909 pending_invalid_xref = 0;
2912 /* Given a type, find the tag that was defined for it and return the tag name.
2913 Otherwise return 0. */
2916 lookup_tag_reverse (type)
2919 struct binding_level *level;
2921 for (level = current_binding_level; level; level = level->level_chain)
2924 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2926 if (TREE_VALUE (tail) == type)
2927 return TREE_PURPOSE (tail);
2933 /* Look up NAME in the current binding level and its superiors
2934 in the namespace of variables, functions and typedefs.
2935 Return a ..._DECL node of some kind representing its definition,
2936 or return 0 if it is undefined. */
2944 if (current_binding_level != global_binding_level
2945 && IDENTIFIER_LOCAL_VALUE (name))
2946 val = IDENTIFIER_LOCAL_VALUE (name);
2948 val = IDENTIFIER_GLOBAL_VALUE (name);
2952 /* Similar to `lookup_name' but look only at current binding level. */
2955 lookup_name_current_level (name)
2960 if (current_binding_level == global_binding_level)
2961 return IDENTIFIER_GLOBAL_VALUE (name);
2963 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2966 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2967 if (DECL_NAME (t) == name)
2973 /* Mark ARG for GC. */
2976 mark_binding_level (arg)
2979 struct binding_level *level = *(struct binding_level **) arg;
2981 for (; level != 0; level = level->level_chain)
2983 ggc_mark_tree (level->names);
2984 ggc_mark_tree (level->tags);
2985 ggc_mark_tree (level->shadowed);
2986 ggc_mark_tree (level->blocks);
2987 ggc_mark_tree (level->this_block);
2988 ggc_mark_tree (level->parm_order);
2992 /* Create the predefined scalar types of C,
2993 and some nodes representing standard constants (0, 1, (void *) 0).
2994 Initialize the global binding level.
2995 Make definitions for built-in primitive functions. */
2998 init_decl_processing ()
3001 tree ptr_ftype_void, ptr_ftype_ptr;
3003 current_function_decl = NULL;
3004 named_labels = NULL;
3005 current_binding_level = NULL_BINDING_LEVEL;
3006 free_binding_level = NULL_BINDING_LEVEL;
3008 /* Make the binding_level structure for global names. */
3010 global_binding_level = current_binding_level;
3012 build_common_tree_nodes (flag_signed_char);
3014 c_common_nodes_and_builtins ();
3016 boolean_type_node = integer_type_node;
3017 boolean_true_node = integer_one_node;
3018 boolean_false_node = integer_zero_node;
3020 /* With GCC, C99's _Bool is always of size 1. */
3021 c_bool_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
3022 TREE_SET_CODE (c_bool_type_node, BOOLEAN_TYPE);
3023 TYPE_MAX_VALUE (c_bool_type_node) = build_int_2 (1, 0);
3024 TREE_TYPE (TYPE_MAX_VALUE (c_bool_type_node)) = c_bool_type_node;
3025 TYPE_PRECISION (c_bool_type_node) = 1;
3026 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
3028 c_bool_false_node = build_int_2 (0, 0);
3029 TREE_TYPE (c_bool_false_node) = c_bool_type_node;
3030 c_bool_true_node = build_int_2 (1, 0);
3031 TREE_TYPE (c_bool_true_node) = c_bool_type_node;
3033 endlink = void_list_node;
3034 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
3036 = build_function_type (ptr_type_node,
3037 tree_cons (NULL_TREE, ptr_type_node, endlink));
3039 /* Types which are common to the fortran compiler and libf2c. When
3040 changing these, you also need to be concerned with f/com.h. */
3042 if (TYPE_PRECISION (float_type_node)
3043 == TYPE_PRECISION (long_integer_type_node))
3045 g77_integer_type_node = long_integer_type_node;
3046 g77_uinteger_type_node = long_unsigned_type_node;
3048 else if (TYPE_PRECISION (float_type_node)
3049 == TYPE_PRECISION (integer_type_node))
3051 g77_integer_type_node = integer_type_node;
3052 g77_uinteger_type_node = unsigned_type_node;
3055 g77_integer_type_node = g77_uinteger_type_node = NULL_TREE;
3057 if (g77_integer_type_node != NULL_TREE)
3059 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_integer"),
3060 g77_integer_type_node));
3061 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_uinteger"),
3062 g77_uinteger_type_node));
3065 if (TYPE_PRECISION (float_type_node) * 2
3066 == TYPE_PRECISION (long_integer_type_node))
3068 g77_longint_type_node = long_integer_type_node;
3069 g77_ulongint_type_node = long_unsigned_type_node;
3071 else if (TYPE_PRECISION (float_type_node) * 2
3072 == TYPE_PRECISION (long_long_integer_type_node))
3074 g77_longint_type_node = long_long_integer_type_node;
3075 g77_ulongint_type_node = long_long_unsigned_type_node;
3078 g77_longint_type_node = g77_ulongint_type_node = NULL_TREE;
3080 if (g77_longint_type_node != NULL_TREE)
3082 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_longint"),
3083 g77_longint_type_node));
3084 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_ulongint"),
3085 g77_ulongint_type_node));
3088 pedantic_lvalues = pedantic;
3090 make_fname_decl = c_make_fname_decl;
3091 start_fname_decls ();
3093 incomplete_decl_finalize_hook = finish_incomplete_decl;
3095 /* Record our roots. */
3097 ggc_add_tree_root (c_global_trees, CTI_MAX);
3098 ggc_add_root (&c_stmt_tree, 1, sizeof c_stmt_tree, mark_stmt_tree);
3099 ggc_add_tree_root (&c_scope_stmt_stack, 1);
3100 ggc_add_tree_root (&named_labels, 1);
3101 ggc_add_tree_root (&shadowed_labels, 1);
3102 ggc_add_root (¤t_binding_level, 1, sizeof current_binding_level,
3103 mark_binding_level);
3104 ggc_add_root (&label_level_chain, 1, sizeof label_level_chain,
3105 mark_binding_level);
3106 ggc_add_tree_root (&static_ctors, 1);
3107 ggc_add_tree_root (&static_dtors, 1);
3110 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3111 decl, NAME is the initialization string and TYPE_DEP indicates whether
3112 NAME depended on the type of the function. As we don't yet implement
3113 delayed emission of static data, we mark the decl as emitted
3114 so it is not placed in the output. Anything using it must therefore pull
3115 out the STRING_CST initializer directly. This does mean that these names
3116 are string merging candidates, which is wrong for C99's __func__. FIXME. */
3119 c_make_fname_decl (id, type_dep)
3123 const char *name = fname_as_string (type_dep);
3124 tree decl, type, init;
3125 size_t length = strlen (name);
3127 type = build_array_type
3128 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
3129 build_index_type (size_int (length)));
3131 decl = build_decl (VAR_DECL, id, type);
3132 /* We don't push the decl, so have to set its context here. */
3133 DECL_CONTEXT (decl) = current_function_decl;
3135 TREE_STATIC (decl) = 1;
3136 TREE_READONLY (decl) = 1;
3137 DECL_ARTIFICIAL (decl) = 1;
3139 init = build_string (length + 1, name);
3140 TREE_TYPE (init) = type;
3141 DECL_INITIAL (decl) = init;
3143 TREE_USED (decl) = 1;
3145 finish_decl (decl, init, NULL_TREE);
3150 /* Return a definition for a builtin function named NAME and whose data type
3151 is TYPE. TYPE should be a function type with argument types.
3152 FUNCTION_CODE tells later passes how to compile calls to this function.
3153 See tree.h for its possible values.
3155 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3156 the name to be called if we can't opencode the function. */
3159 builtin_function (name, type, function_code, class, library_name)
3163 enum built_in_class class;
3164 const char *library_name;
3166 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3167 DECL_EXTERNAL (decl) = 1;
3168 TREE_PUBLIC (decl) = 1;
3169 /* If -traditional, permit redefining a builtin function any way you like.
3170 (Though really, if the program redefines these functions,
3171 it probably won't work right unless compiled with -fno-builtin.) */
3172 if (flag_traditional && name[0] != '_')
3173 DECL_BUILT_IN_NONANSI (decl) = 1;
3175 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
3176 make_decl_rtl (decl, NULL);
3178 DECL_BUILT_IN_CLASS (decl) = class;
3179 DECL_FUNCTION_CODE (decl) = function_code;
3181 /* Warn if a function in the namespace for users
3182 is used without an occasion to consider it declared. */
3183 if (name[0] != '_' || name[1] != '_')
3184 C_DECL_ANTICIPATED (decl) = 1;
3186 /* Possibly apply some default attributes to this built-in function. */
3187 decl_attributes (&decl, NULL_TREE, 0);
3192 /* Apply default attributes to a function, if a system function with default
3196 insert_default_attributes (decl)
3199 if (!TREE_PUBLIC (decl))
3201 c_common_insert_default_attributes (decl);
3204 /* Called when a declaration is seen that contains no names to declare.
3205 If its type is a reference to a structure, union or enum inherited
3206 from a containing scope, shadow that tag name for the current scope
3207 with a forward reference.
3208 If its type defines a new named structure or union
3209 or defines an enum, it is valid but we need not do anything here.
3210 Otherwise, it is an error. */
3213 shadow_tag (declspecs)
3216 shadow_tag_warned (declspecs, 0);
3220 shadow_tag_warned (declspecs, warned)
3223 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3230 pending_invalid_xref = 0;
3232 /* Remove the attributes from declspecs, since they will confuse the
3234 split_specs_attrs (declspecs, &specs, &attrs);
3236 for (link = specs; link; link = TREE_CHAIN (link))
3238 tree value = TREE_VALUE (link);
3239 enum tree_code code = TREE_CODE (value);
3241 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3242 /* Used to test also that TYPE_SIZE (value) != 0.
3243 That caused warning for `struct foo;' at top level in the file. */
3245 tree name = lookup_tag_reverse (value);
3252 if (warned != 1 && code != ENUMERAL_TYPE)
3253 /* Empty unnamed enum OK */
3255 pedwarn ("unnamed struct/union that defines no instances");
3261 t = lookup_tag (code, name, current_binding_level, 1);
3265 t = make_node (code);
3272 if (!warned && ! in_system_header)
3274 warning ("useless keyword or type name in empty declaration");
3281 error ("two types specified in one empty declaration");
3286 pedwarn ("empty declaration");
3290 /* Construct an array declarator. EXPR is the expression inside [], or
3291 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
3292 to the pointer to which a parameter array is converted). STATIC_P is
3293 non-zero if "static" is inside the [], zero otherwise. VLA_UNSPEC_P
3294 is non-zero is the array is [*], a VLA of unspecified length which is
3295 nevertheless a complete type (not currently implemented by GCC),
3296 zero otherwise. The declarator is constructed as an ARRAY_REF
3297 (to be decoded by grokdeclarator), whose operand 0 is what's on the
3298 left of the [] (filled by in set_array_declarator_type) and operand 1
3299 is the expression inside; whose TREE_TYPE is the type qualifiers and
3300 which has TREE_STATIC set if "static" is used. */
3303 build_array_declarator (expr, quals, static_p, vla_unspec_p)
3310 decl = build_nt (ARRAY_REF, NULL_TREE, expr);
3311 TREE_TYPE (decl) = quals;
3312 TREE_STATIC (decl) = (static_p ? 1 : 0);
3313 if (pedantic && !flag_isoc99)
3315 if (static_p || quals != NULL_TREE)
3316 pedwarn ("ISO C89 does not support `static' or type qualifiers in parameter array declarators");
3318 pedwarn ("ISO C89 does not support `[*]' array declarators");
3321 warning ("GCC does not yet properly implement `[*]' array declarators");
3325 /* Set the type of an array declarator. DECL is the declarator, as
3326 constructed by build_array_declarator; TYPE is what appears on the left
3327 of the [] and goes in operand 0. ABSTRACT_P is non-zero if it is an
3328 abstract declarator, zero otherwise; this is used to reject static and
3329 type qualifiers in abstract declarators, where they are not in the
3333 set_array_declarator_type (decl, type, abstract_p)
3338 TREE_OPERAND (decl, 0) = type;
3339 if (abstract_p && (TREE_TYPE (decl) != NULL_TREE || TREE_STATIC (decl)))
3340 error ("static or type qualifiers in abstract declarator");
3344 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3347 groktypename (typename)
3350 if (TREE_CODE (typename) != TREE_LIST)
3352 return grokdeclarator (TREE_VALUE (typename),
3353 TREE_PURPOSE (typename),
3357 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3360 groktypename_in_parm_context (typename)
3363 if (TREE_CODE (typename) != TREE_LIST)
3365 return grokdeclarator (TREE_VALUE (typename),
3366 TREE_PURPOSE (typename),
3370 /* Decode a declarator in an ordinary declaration or data definition.
3371 This is called as soon as the type information and variable name
3372 have been parsed, before parsing the initializer if any.
3373 Here we create the ..._DECL node, fill in its type,
3374 and put it on the list of decls for the current context.
3375 The ..._DECL node is returned as the value.
3377 Exception: for arrays where the length is not specified,
3378 the type is left null, to be filled in by `finish_decl'.
3380 Function definitions do not come here; they go to start_function
3381 instead. However, external and forward declarations of functions
3382 do go through here. Structure field declarations are done by
3383 grokfield and not through here. */
3386 start_decl (declarator, declspecs, initialized, attributes)
3387 tree declarator, declspecs;
3391 tree decl = grokdeclarator (declarator, declspecs,
3392 NORMAL, initialized);
3395 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3396 && MAIN_NAME_P (DECL_NAME (decl)))
3397 warning_with_decl (decl, "`%s' is usually a function");
3400 /* Is it valid for this decl to have an initializer at all?
3401 If not, set INITIALIZED to zero, which will indirectly
3402 tell `finish_decl' to ignore the initializer once it is parsed. */
3403 switch (TREE_CODE (decl))
3406 /* typedef foo = bar means give foo the same type as bar.
3407 We haven't parsed bar yet, so `finish_decl' will fix that up.
3408 Any other case of an initialization in a TYPE_DECL is an error. */
3409 if (pedantic || list_length (declspecs) > 1)
3411 error ("typedef `%s' is initialized",
3412 IDENTIFIER_POINTER (DECL_NAME (decl)));
3418 error ("function `%s' is initialized like a variable",
3419 IDENTIFIER_POINTER (DECL_NAME (decl)));
3424 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3425 error ("parameter `%s' is initialized",
3426 IDENTIFIER_POINTER (DECL_NAME (decl)));
3431 /* Don't allow initializations for incomplete types
3432 except for arrays which might be completed by the initialization. */
3434 /* This can happen if the array size is an undefined macro. We already
3435 gave a warning, so we don't need another one. */
3436 if (TREE_TYPE (decl) == error_mark_node)
3438 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3440 /* A complete type is ok if size is fixed. */
3442 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3443 || C_DECL_VARIABLE_SIZE (decl))
3445 error ("variable-sized object may not be initialized");
3449 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3451 error ("variable `%s' has initializer but incomplete type",
3452 IDENTIFIER_POINTER (DECL_NAME (decl)));
3455 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
3457 error ("elements of array `%s' have incomplete type",
3458 IDENTIFIER_POINTER (DECL_NAME (decl)));
3466 /* Seems redundant with grokdeclarator. */
3467 if (current_binding_level != global_binding_level
3468 && DECL_EXTERNAL (decl)
3469 && TREE_CODE (decl) != FUNCTION_DECL)
3470 warning ("declaration of `%s' has `extern' and is initialized",
3471 IDENTIFIER_POINTER (DECL_NAME (decl)));
3473 DECL_EXTERNAL (decl) = 0;
3474 if (current_binding_level == global_binding_level)
3475 TREE_STATIC (decl) = 1;
3477 /* Tell `pushdecl' this is an initialized decl
3478 even though we don't yet have the initializer expression.
3479 Also tell `finish_decl' it may store the real initializer. */
3480 DECL_INITIAL (decl) = error_mark_node;
3483 /* If this is a function declaration, write a record describing it to the
3484 prototypes file (if requested). */
3486 if (TREE_CODE (decl) == FUNCTION_DECL)
3487 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3489 /* ANSI specifies that a tentative definition which is not merged with
3490 a non-tentative definition behaves exactly like a definition with an
3491 initializer equal to zero. (Section 3.7.2)
3492 -fno-common gives strict ANSI behavior. Usually you don't want it.
3493 This matters only for variables with external linkage. */
3494 if (! flag_no_common || ! TREE_PUBLIC (decl))
3495 DECL_COMMON (decl) = 1;
3497 /* Set attributes here so if duplicate decl, will have proper attributes. */
3498 decl_attributes (&decl, attributes, 0);
3500 if (TREE_CODE (decl) == FUNCTION_DECL
3501 && DECL_DECLARED_INLINE_P (decl)
3502 && DECL_UNINLINABLE (decl)
3503 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
3504 warning_with_decl (decl,
3505 "inline function `%s' given attribute noinline");
3507 /* Add this decl to the current binding level.
3508 TEM may equal DECL or it may be a previous decl of the same name. */
3509 tem = pushdecl (decl);
3511 /* For a local variable, define the RTL now. */
3512 if (current_binding_level != global_binding_level
3513 /* But not if this is a duplicate decl
3514 and we preserved the rtl from the previous one
3515 (which may or may not happen). */
3516 && !DECL_RTL_SET_P (tem)
3517 && !DECL_CONTEXT (tem))
3519 if (TREE_TYPE (tem) != error_mark_node
3520 && COMPLETE_TYPE_P (TREE_TYPE (tem)))
3522 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3523 && DECL_INITIAL (tem) != 0)
3530 /* Finish processing of a declaration;
3531 install its initial value.
3532 If the length of an array type is not known before,
3533 it must be determined now, from the initial value, or it is an error. */
3536 finish_decl (decl, init, asmspec_tree)
3540 tree type = TREE_TYPE (decl);
3541 int was_incomplete = (DECL_SIZE (decl) == 0);
3542 const char *asmspec = 0;
3544 /* If a name was specified, get the string. */
3546 asmspec = TREE_STRING_POINTER (asmspec_tree);
3548 /* If `start_decl' didn't like having an initialization, ignore it now. */
3549 if (init != 0 && DECL_INITIAL (decl) == 0)
3552 /* Don't crash if parm is initialized. */
3553 if (TREE_CODE (decl) == PARM_DECL)
3558 if (TREE_CODE (decl) != TYPE_DECL)
3559 store_init_value (decl, init);
3562 /* typedef foo = bar; store the type of bar as the type of foo. */
3563 TREE_TYPE (decl) = TREE_TYPE (init);
3564 DECL_INITIAL (decl) = init = 0;
3568 /* Deduce size of array from initialization, if not already known */
3569 if (TREE_CODE (type) == ARRAY_TYPE
3570 && TYPE_DOMAIN (type) == 0
3571 && TREE_CODE (decl) != TYPE_DECL)
3574 = (TREE_STATIC (decl)
3575 /* Even if pedantic, an external linkage array
3576 may have incomplete type at first. */
3577 ? pedantic && !TREE_PUBLIC (decl)
3578 : !DECL_EXTERNAL (decl));
3580 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3582 /* Get the completed type made by complete_array_type. */
3583 type = TREE_TYPE (decl);
3586 error_with_decl (decl, "initializer fails to determine size of `%s'");
3588 else if (failure == 2)
3591 error_with_decl (decl, "array size missing in `%s'");
3592 /* If a `static' var's size isn't known,
3593 make it extern as well as static, so it does not get
3595 If it is not `static', then do not mark extern;
3596 finish_incomplete_decl will give it a default size
3597 and it will get allocated. */
3598 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3599 DECL_EXTERNAL (decl) = 1;
3602 /* TYPE_MAX_VALUE is always one less than the number of elements
3603 in the array, because we start counting at zero. Therefore,
3604 warn only if the value is less than zero. */
3605 else if (pedantic && TYPE_DOMAIN (type) != 0
3606 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3607 error_with_decl (decl, "zero or negative size array `%s'");
3609 layout_decl (decl, 0);
3612 if (TREE_CODE (decl) == VAR_DECL)
3614 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
3615 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3616 layout_decl (decl, 0);
3618 if (DECL_SIZE (decl) == 0
3619 /* Don't give an error if we already gave one earlier. */
3620 && TREE_TYPE (decl) != error_mark_node
3621 && (TREE_STATIC (decl)
3623 /* A static variable with an incomplete type
3624 is an error if it is initialized.
3625 Also if it is not file scope.
3626 Otherwise, let it through, but if it is not `extern'
3627 then it may cause an error message later. */
3628 (DECL_INITIAL (decl) != 0
3629 || DECL_CONTEXT (decl) != 0)
3631 /* An automatic variable with an incomplete type
3633 !DECL_EXTERNAL (decl)))
3635 error_with_decl (decl, "storage size of `%s' isn't known");
3636 TREE_TYPE (decl) = error_mark_node;
3639 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3640 && DECL_SIZE (decl) != 0)
3642 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3643 constant_expression_warning (DECL_SIZE (decl));
3645 error_with_decl (decl, "storage size of `%s' isn't constant");
3648 if (TREE_USED (type))
3649 TREE_USED (decl) = 1;
3652 /* If this is a function and an assembler name is specified, it isn't
3653 builtin any more. Also reset DECL_RTL so we can give it its new
3655 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3657 DECL_BUILT_IN_CLASS (decl) = NOT_BUILT_IN;
3658 SET_DECL_RTL (decl, NULL_RTX);
3659 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
3662 /* Output the assembler code and/or RTL code for variables and functions,
3663 unless the type is an undefined structure or union.
3664 If not, it will get done when the type is completed. */
3666 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3668 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3669 maybe_objc_check_decl (decl);
3671 if (!DECL_CONTEXT (decl))
3673 if (DECL_INITIAL (decl) == NULL_TREE
3674 || DECL_INITIAL (decl) == error_mark_node)
3675 /* Don't output anything
3676 when a tentative file-scope definition is seen.
3677 But at end of compilation, do output code for them. */
3678 DECL_DEFER_OUTPUT (decl) = 1;
3679 rest_of_decl_compilation (decl, asmspec,
3680 (DECL_CONTEXT (decl) == 0
3681 || TREE_ASM_WRITTEN (decl)), 0);
3685 /* This is a local variable. If there is an ASMSPEC, the
3686 user has requested that we handle it specially. */
3689 /* In conjunction with an ASMSPEC, the `register'
3690 keyword indicates that we should place the variable
3691 in a particular register. */
3692 if (DECL_REGISTER (decl))
3693 DECL_C_HARD_REGISTER (decl) = 1;
3695 /* If this is not a static variable, issue a warning.
3696 It doesn't make any sense to give an ASMSPEC for an
3697 ordinary, non-register local variable. Historically,
3698 GCC has accepted -- but ignored -- the ASMSPEC in
3700 if (TREE_CODE (decl) == VAR_DECL
3701 && !DECL_REGISTER (decl)
3702 && !TREE_STATIC (decl))
3703 warning_with_decl (decl,
3704 "ignoring asm-specifier for non-static local variable `%s'");
3706 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
3709 if (TREE_CODE (decl) != FUNCTION_DECL)
3710 add_decl_stmt (decl);
3713 if (DECL_CONTEXT (decl) != 0)
3715 /* Recompute the RTL of a local array now
3716 if it used to be an incomplete type. */
3718 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3720 /* If we used it already as memory, it must stay in memory. */
3721 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3722 /* If it's still incomplete now, no init will save it. */
3723 if (DECL_SIZE (decl) == 0)
3724 DECL_INITIAL (decl) = 0;
3729 if (TREE_CODE (decl) == TYPE_DECL)
3731 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3732 maybe_objc_check_decl (decl);
3733 rest_of_decl_compilation (decl, NULL, DECL_CONTEXT (decl) == 0, 0);
3736 /* At the end of a declaration, throw away any variable type sizes
3737 of types defined inside that declaration. There is no use
3738 computing them in the following function definition. */
3739 if (current_binding_level == global_binding_level)
3740 get_pending_sizes ();
3743 /* If DECL has a cleanup, build and return that cleanup here.
3744 This is a callback called by expand_expr. */
3747 maybe_build_cleanup (decl)
3748 tree decl ATTRIBUTE_UNUSED;
3750 /* There are no cleanups in C. */
3754 /* Given a parsed parameter declaration,
3755 decode it into a PARM_DECL and push that on the current binding level.
3756 Also, for the sake of forward parm decls,
3757 record the given order of parms in `parm_order'. */
3760 push_parm_decl (parm)
3764 int old_immediate_size_expand = immediate_size_expand;
3765 /* Don't try computing parm sizes now -- wait till fn is called. */
3766 immediate_size_expand = 0;
3768 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3769 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3770 decl_attributes (&decl, TREE_VALUE (parm), 0);
3773 if (DECL_NAME (decl))
3776 olddecl = lookup_name (DECL_NAME (decl));
3777 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3778 pedwarn_with_decl (decl,
3779 "ANSI C forbids parameter `%s' shadowing typedef");
3783 decl = pushdecl (decl);
3785 immediate_size_expand = old_immediate_size_expand;
3787 current_binding_level->parm_order
3788 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3790 /* Add this decl to the current binding level. */
3791 finish_decl (decl, NULL_TREE, NULL_TREE);
3794 /* Clear the given order of parms in `parm_order'.
3795 Used at start of parm list,
3796 and also at semicolon terminating forward decls. */
3801 current_binding_level->parm_order = NULL_TREE;
3804 /* Make TYPE a complete type based on INITIAL_VALUE.
3805 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3806 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3809 complete_array_type (type, initial_value, do_default)
3814 tree maxindex = NULL_TREE;
3819 /* Note MAXINDEX is really the maximum index,
3820 one less than the size. */
3821 if (TREE_CODE (initial_value) == STRING_CST)
3824 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3825 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3828 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3830 tree elts = CONSTRUCTOR_ELTS (initial_value);
3831 maxindex = build_int_2 (-1, -1);
3832 for (; elts; elts = TREE_CHAIN (elts))
3834 if (TREE_PURPOSE (elts))
3835 maxindex = TREE_PURPOSE (elts);
3837 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3838 maxindex, integer_one_node));
3840 maxindex = copy_node (maxindex);
3844 /* Make an error message unless that happened already. */
3845 if (initial_value != error_mark_node)
3848 /* Prevent further error messages. */
3849 maxindex = build_int_2 (0, 0);
3856 maxindex = build_int_2 (0, 0);
3862 TYPE_DOMAIN (type) = build_index_type (maxindex);
3863 if (!TREE_TYPE (maxindex))
3864 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3867 /* Lay out the type now that we can get the real answer. */
3874 /* Given declspecs and a declarator,
3875 determine the name and type of the object declared
3876 and construct a ..._DECL node for it.
3877 (In one case we can return a ..._TYPE node instead.
3878 For invalid input we sometimes return 0.)
3880 DECLSPECS is a chain of tree_list nodes whose value fields
3881 are the storage classes and type specifiers.
3883 DECL_CONTEXT says which syntactic context this declaration is in:
3884 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3885 FUNCDEF for a function definition. Like NORMAL but a few different
3886 error messages in each case. Return value may be zero meaning
3887 this definition is too screwy to try to parse.
3888 PARM for a parameter declaration (either within a function prototype
3889 or before a function body). Make a PARM_DECL, or return void_type_node.
3890 TYPENAME if for a typename (in a cast or sizeof).
3891 Don't make a DECL node; just return the ..._TYPE node.
3892 FIELD for a struct or union field; make a FIELD_DECL.
3893 BITFIELD for a field with specified width.
3894 INITIALIZED is 1 if the decl has an initializer.
3896 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3897 It may also be so in the PARM case, for a prototype where the
3898 argument type is specified but not the name.
3900 This function is where the complicated C meanings of `static'
3901 and `extern' are interpreted. */
3904 grokdeclarator (declarator, declspecs, decl_context, initialized)
3907 enum decl_context decl_context;
3912 tree type = NULL_TREE;
3917 int type_quals = TYPE_UNQUALIFIED;
3919 int explicit_int = 0;
3920 int explicit_char = 0;
3921 int defaulted_int = 0;
3922 tree typedef_decl = 0;
3924 tree typedef_type = 0;
3925 int funcdef_flag = 0;
3926 enum tree_code innermost_code = ERROR_MARK;
3928 int size_varies = 0;
3929 tree decl_attr = NULL_TREE;
3930 tree array_ptr_quals = NULL_TREE;
3931 int array_parm_static = 0;
3932 tree returned_attrs = NULL_TREE;
3934 if (decl_context == BITFIELD)
3935 bitfield = 1, decl_context = FIELD;
3937 if (decl_context == FUNCDEF)
3938 funcdef_flag = 1, decl_context = NORMAL;
3940 /* Look inside a declarator for the name being declared
3941 and get it as a string, for an error message. */
3943 tree decl = declarator;
3947 switch (TREE_CODE (decl))
3952 innermost_code = TREE_CODE (decl);
3953 decl = TREE_OPERAND (decl, 0);
3957 decl = TREE_VALUE (decl);
3960 case IDENTIFIER_NODE:
3961 name = IDENTIFIER_POINTER (decl);
3972 /* A function definition's declarator must have the form of
3973 a function declarator. */
3975 if (funcdef_flag && innermost_code != CALL_EXPR)
3978 /* Anything declared one level down from the top level
3979 must be one of the parameters of a function
3980 (because the body is at least two levels down). */
3982 /* If this looks like a function definition, make it one,
3983 even if it occurs where parms are expected.
3984 Then store_parm_decls will reject it and not use it as a parm. */
3985 if (decl_context == NORMAL && !funcdef_flag
3986 && current_binding_level->parm_flag)
3987 decl_context = PARM;
3989 /* Look through the decl specs and record which ones appear.
3990 Some typespecs are defined as built-in typenames.
3991 Others, the ones that are modifiers of other types,
3992 are represented by bits in SPECBITS: set the bits for
3993 the modifiers that appear. Storage class keywords are also in SPECBITS.
3995 If there is a typedef name or a type, store the type in TYPE.
3996 This includes builtin typedefs such as `int'.
3998 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3999 and did not come from a user typedef.
4001 Set LONGLONG if `long' is mentioned twice. */
4003 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
4005 tree id = TREE_VALUE (spec);
4007 if (id == ridpointers[(int) RID_INT])
4009 if (id == ridpointers[(int) RID_CHAR])
4012 if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
4014 enum rid i = C_RID_CODE (id);
4015 if ((int) i <= (int) RID_LAST_MODIFIER)
4017 if (i == RID_LONG && (specbits & (1 << (int) i)))
4020 error ("`long long long' is too long for GCC");
4023 if (pedantic && !flag_isoc99 && ! in_system_header
4025 pedwarn ("ISO C89 does not support `long long'");
4029 else if (specbits & (1 << (int) i))
4030 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
4031 specbits |= 1 << (int) i;
4036 error ("two or more data types in declaration of `%s'", name);
4037 /* Actual typedefs come to us as TYPE_DECL nodes. */
4038 else if (TREE_CODE (id) == TYPE_DECL)
4040 type = TREE_TYPE (id);
4041 decl_attr = DECL_ATTRIBUTES (id);
4044 /* Built-in types come as identifiers. */
4045 else if (TREE_CODE (id) == IDENTIFIER_NODE)
4047 tree t = lookup_name (id);
4048 if (TREE_TYPE (t) == error_mark_node)
4050 else if (!t || TREE_CODE (t) != TYPE_DECL)
4051 error ("`%s' fails to be a typedef or built in type",
4052 IDENTIFIER_POINTER (id));
4055 type = TREE_TYPE (t);
4059 else if (TREE_CODE (id) != ERROR_MARK)
4066 typedef_type = type;
4068 size_varies = C_TYPE_VARIABLE_SIZE (type);
4070 /* No type at all: default to `int', and set DEFAULTED_INT
4071 because it was not a user-defined typedef. */
4075 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4076 | (1 << (int) RID_SIGNED)
4077 | (1 << (int) RID_UNSIGNED)
4078 | (1 << (int) RID_COMPLEX))))
4079 /* Don't warn about typedef foo = bar. */
4080 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
4081 && ! in_system_header)
4083 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
4084 and this is a function, or if -Wimplicit; prefer the former
4085 warning since it is more explicit. */
4086 if ((warn_implicit_int || warn_return_type || flag_isoc99)
4088 warn_about_return_type = 1;
4089 else if (warn_implicit_int || flag_isoc99)
4090 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
4095 type = integer_type_node;
4098 /* Now process the modifiers that were specified
4099 and check for invalid combinations. */
4101 /* Long double is a special combination. */
4103 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4104 && TYPE_MAIN_VARIANT (type) == double_type_node)
4106 specbits &= ~(1 << (int) RID_LONG);
4107 type = long_double_type_node;
4110 /* Check all other uses of type modifiers. */
4112 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4113 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4117 if ((specbits & 1 << (int) RID_LONG)
4118 && (specbits & 1 << (int) RID_SHORT))
4119 error ("both long and short specified for `%s'", name);
4120 else if (((specbits & 1 << (int) RID_LONG)
4121 || (specbits & 1 << (int) RID_SHORT))
4123 error ("long or short specified with char for `%s'", name);
4124 else if (((specbits & 1 << (int) RID_LONG)
4125 || (specbits & 1 << (int) RID_SHORT))
4126 && TREE_CODE (type) == REAL_TYPE)
4128 static int already = 0;
4130 error ("long or short specified with floating type for `%s'", name);
4131 if (! already && ! pedantic)
4133 error ("the only valid combination is `long double'");
4137 else if ((specbits & 1 << (int) RID_SIGNED)
4138 && (specbits & 1 << (int) RID_UNSIGNED))
4139 error ("both signed and unsigned specified for `%s'", name);
4140 else if (TREE_CODE (type) != INTEGER_TYPE)
4141 error ("long, short, signed or unsigned invalid for `%s'", name);
4145 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4147 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4149 if (flag_pedantic_errors)
4154 /* Discard the type modifiers if they are invalid. */
4157 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4158 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4163 if ((specbits & (1 << (int) RID_COMPLEX))
4164 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4166 error ("complex invalid for `%s'", name);
4167 specbits &= ~(1 << (int) RID_COMPLEX);
4170 /* Decide whether an integer type is signed or not.
4171 Optionally treat bitfields as signed by default. */
4172 if (specbits & 1 << (int) RID_UNSIGNED
4173 /* Traditionally, all bitfields are unsigned. */
4174 || (bitfield && flag_traditional
4175 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4176 || (bitfield && ! flag_signed_bitfields
4177 && (explicit_int || defaulted_int || explicit_char
4178 /* A typedef for plain `int' without `signed'
4179 can be controlled just like plain `int'. */
4180 || ! (typedef_decl != 0
4181 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4182 && TREE_CODE (type) != ENUMERAL_TYPE
4183 && !(specbits & 1 << (int) RID_SIGNED)))
4186 type = long_long_unsigned_type_node;
4187 else if (specbits & 1 << (int) RID_LONG)
4188 type = long_unsigned_type_node;
4189 else if (specbits & 1 << (int) RID_SHORT)
4190 type = short_unsigned_type_node;
4191 else if (type == char_type_node)
4192 type = unsigned_char_type_node;
4193 else if (typedef_decl)
4194 type = unsigned_type (type);
4196 type = unsigned_type_node;
4198 else if ((specbits & 1 << (int) RID_SIGNED)
4199 && type == char_type_node)
4200 type = signed_char_type_node;
4202 type = long_long_integer_type_node;
4203 else if (specbits & 1 << (int) RID_LONG)
4204 type = long_integer_type_node;
4205 else if (specbits & 1 << (int) RID_SHORT)
4206 type = short_integer_type_node;
4208 if (specbits & 1 << (int) RID_COMPLEX)
4210 if (pedantic && !flag_isoc99)
4211 pedwarn ("ISO C89 does not support complex types");
4212 /* If we just have "complex", it is equivalent to
4213 "complex double", but if any modifiers at all are specified it is
4214 the complex form of TYPE. E.g, "complex short" is
4215 "complex short int". */
4217 if (defaulted_int && ! longlong
4218 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4219 | (1 << (int) RID_SIGNED)
4220 | (1 << (int) RID_UNSIGNED))))
4223 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
4224 type = complex_double_type_node;
4226 else if (type == integer_type_node)
4229 pedwarn ("ISO C does not support complex integer types");
4230 type = complex_integer_type_node;
4232 else if (type == float_type_node)
4233 type = complex_float_type_node;
4234 else if (type == double_type_node)
4235 type = complex_double_type_node;
4236 else if (type == long_double_type_node)
4237 type = complex_long_double_type_node;
4241 pedwarn ("ISO C does not support complex integer types");
4242 type = build_complex_type (type);
4246 /* Figure out the type qualifiers for the declaration. There are
4247 two ways a declaration can become qualified. One is something
4248 like `const int i' where the `const' is explicit. Another is
4249 something like `typedef const int CI; CI i' where the type of the
4250 declaration contains the `const'. */
4251 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4252 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
4253 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4254 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4255 if (constp > 1 && ! flag_isoc99)
4256 pedwarn ("duplicate `const'");
4257 if (restrictp > 1 && ! flag_isoc99)
4258 pedwarn ("duplicate `restrict'");
4259 if (volatilep > 1 && ! flag_isoc99)
4260 pedwarn ("duplicate `volatile'");
4261 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
4262 type = TYPE_MAIN_VARIANT (type);
4263 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4264 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4265 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4267 /* Warn if two storage classes are given. Default to `auto'. */
4272 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4273 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4274 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4275 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4276 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4278 /* Warn about storage classes that are invalid for certain
4279 kinds of declarations (parameters, typenames, etc.). */
4282 error ("multiple storage classes in declaration of `%s'", name);
4283 else if (funcdef_flag
4285 & ((1 << (int) RID_REGISTER)
4286 | (1 << (int) RID_AUTO)
4287 | (1 << (int) RID_TYPEDEF))))
4289 if (specbits & 1 << (int) RID_AUTO
4290 && (pedantic || current_binding_level == global_binding_level))
4291 pedwarn ("function definition declared `auto'");
4292 if (specbits & 1 << (int) RID_REGISTER)
4293 error ("function definition declared `register'");
4294 if (specbits & 1 << (int) RID_TYPEDEF)
4295 error ("function definition declared `typedef'");
4296 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4297 | (1 << (int) RID_AUTO));
4299 else if (decl_context != NORMAL && nclasses > 0)
4301 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4305 switch (decl_context)
4308 error ("storage class specified for structure field `%s'",
4312 error ("storage class specified for parameter `%s'", name);
4315 error ("storage class specified for typename");
4318 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4319 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4320 | (1 << (int) RID_EXTERN));
4323 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4325 /* `extern' with initialization is invalid if not at top level. */
4326 if (current_binding_level == global_binding_level)
4327 warning ("`%s' initialized and declared `extern'", name);
4329 error ("`%s' has both `extern' and initializer", name);
4331 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4332 && current_binding_level != global_binding_level)
4333 error ("nested function `%s' declared `extern'", name);
4334 else if (current_binding_level == global_binding_level
4335 && specbits & (1 << (int) RID_AUTO))
4336 error ("top-level declaration of `%s' specifies `auto'", name);
4339 /* Now figure out the structure of the declarator proper.
4340 Descend through it, creating more complex types, until we reach
4341 the declared identifier (or NULL_TREE, in an absolute declarator). */
4343 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4345 if (type == error_mark_node)
4347 declarator = TREE_OPERAND (declarator, 0);
4351 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4352 an INDIRECT_REF (for *...),
4353 a CALL_EXPR (for ...(...)),
4354 a TREE_LIST (for nested attributes),
4355 an identifier (for the name being declared)
4356 or a null pointer (for the place in an absolute declarator
4357 where the name was omitted).
4358 For the last two cases, we have just exited the loop.
4360 At this point, TYPE is the type of elements of an array,
4361 or for a function to return, or for a pointer to point to.
4362 After this sequence of ifs, TYPE is the type of the
4363 array or function or pointer, and DECLARATOR has had its
4364 outermost layer removed. */
4366 if (array_ptr_quals != NULL_TREE || array_parm_static)
4368 /* Only the innermost declarator (making a parameter be of
4369 array type which is converted to pointer type)
4370 may have static or type qualifiers. */
4371 error ("static or type qualifiers in non-parameter array declarator");
4372 array_ptr_quals = NULL_TREE;
4373 array_parm_static = 0;
4376 if (TREE_CODE (declarator) == TREE_LIST)
4378 /* We encode a declarator with embedded attributes using
4380 tree attrs = TREE_PURPOSE (declarator);
4383 declarator = TREE_VALUE (declarator);
4384 inner_decl = declarator;
4385 while (inner_decl != NULL_TREE
4386 && TREE_CODE (inner_decl) == TREE_LIST)
4387 inner_decl = TREE_VALUE (inner_decl);
4388 if (inner_decl == NULL_TREE
4389 || TREE_CODE (inner_decl) == IDENTIFIER_NODE)
4390 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
4391 if (TREE_CODE (inner_decl) == CALL_EXPR)
4392 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
4393 if (TREE_CODE (inner_decl) == ARRAY_REF)
4394 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
4395 returned_attrs = decl_attributes (&type,
4396 chainon (returned_attrs, attrs),
4399 else if (TREE_CODE (declarator) == ARRAY_REF)
4401 tree itype = NULL_TREE;
4402 tree size = TREE_OPERAND (declarator, 1);
4403 /* The index is a signed object `sizetype' bits wide. */
4404 tree index_type = signed_type (sizetype);
4406 array_ptr_quals = TREE_TYPE (declarator);
4407 array_parm_static = TREE_STATIC (declarator);
4409 declarator = TREE_OPERAND (declarator, 0);
4411 /* Check for some types that there cannot be arrays of. */
4413 if (VOID_TYPE_P (type))
4415 error ("declaration of `%s' as array of voids", name);
4416 type = error_mark_node;
4419 if (TREE_CODE (type) == FUNCTION_TYPE)
4421 error ("declaration of `%s' as array of functions", name);
4422 type = error_mark_node;
4425 if (size == error_mark_node)
4426 type = error_mark_node;
4428 if (type == error_mark_node)
4431 /* If size was specified, set ITYPE to a range-type for that size.
4432 Otherwise, ITYPE remains null. finish_decl may figure it out
4433 from an initial value. */
4437 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4438 STRIP_TYPE_NOPS (size);
4440 if (! INTEGRAL_TYPE_P (TREE_TYPE (size)))
4442 error ("size of array `%s' has non-integer type", name);
4443 size = integer_one_node;
4446 if (pedantic && integer_zerop (size))
4447 pedwarn ("ISO C forbids zero-size array `%s'", name);
4449 if (TREE_CODE (size) == INTEGER_CST)
4451 constant_expression_warning (size);
4452 if (tree_int_cst_sgn (size) < 0)
4454 error ("size of array `%s' is negative", name);
4455 size = integer_one_node;
4460 /* Make sure the array size remains visibly nonconstant
4461 even if it is (eg) a const variable with known value. */
4466 if (TREE_CONSTANT (size))
4467 pedwarn ("ISO C89 forbids array `%s' whose size can't be evaluated",
4470 pedwarn ("ISO C89 forbids variable-size array `%s'",
4475 if (integer_zerop (size))
4477 /* A zero-length array cannot be represented with an
4478 unsigned index type, which is what we'll get with
4479 build_index_type. Create an open-ended range instead. */
4480 itype = build_range_type (sizetype, size, NULL_TREE);
4484 /* Compute the maximum valid index, that is, size - 1.
4485 Do the calculation in index_type, so that if it is
4486 a variable the computations will be done in the
4488 itype = fold (build (MINUS_EXPR, index_type,
4489 convert (index_type, size),
4490 convert (index_type, size_one_node)));
4492 /* If that overflowed, the array is too big.
4493 ??? While a size of INT_MAX+1 technically shouldn't
4494 cause an overflow (because we subtract 1), the overflow
4495 is recorded during the conversion to index_type, before
4496 the subtraction. Handling this case seems like an
4497 unnecessary complication. */
4498 if (TREE_OVERFLOW (itype))
4500 error ("size of array `%s' is too large", name);
4501 type = error_mark_node;
4506 itype = variable_size (itype);
4507 itype = build_index_type (itype);
4510 else if (decl_context == FIELD)
4512 /* ??? Need to check somewhere that this is a structure
4513 and not a union, that this field is last, and that
4514 this structure has at least one other named member. */
4516 if (pedantic && !flag_isoc99 && !in_system_header)
4517 pedwarn ("ISO C89 does not support flexible array members");
4519 /* ISO C99 Flexible array members are effectively identical
4520 to GCC's zero-length array extension. */
4521 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4524 /* If pedantic, complain about arrays of incomplete types. */
4526 if (pedantic && !COMPLETE_TYPE_P (type))
4527 pedwarn ("array type has incomplete element type");
4530 /* We shouldn't have a function type here at all!
4531 Functions aren't allowed as array elements. */
4532 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4533 && (constp || volatilep))
4534 pedwarn ("ANSI C forbids const or volatile function types");
4537 /* Build the array type itself, then merge any constancy or
4538 volatility into the target type. We must do it in this order
4539 to ensure that the TYPE_MAIN_VARIANT field of the array type
4540 is set correctly. */
4542 type = build_array_type (type, itype);
4544 type = c_build_qualified_type (type, type_quals);
4547 C_TYPE_VARIABLE_SIZE (type) = 1;
4549 /* The GCC extension for zero-length arrays differs from
4550 ISO flexible array members in that sizeof yields zero. */
4551 if (size && integer_zerop (size))
4554 TYPE_SIZE (type) = bitsize_zero_node;
4555 TYPE_SIZE_UNIT (type) = size_zero_node;
4557 if (decl_context != PARM
4558 && (array_ptr_quals != NULL_TREE || array_parm_static))
4560 error ("static or type qualifiers in non-parameter array declarator");
4561 array_ptr_quals = NULL_TREE;
4562 array_parm_static = 0;
4565 else if (TREE_CODE (declarator) == CALL_EXPR)
4569 /* Declaring a function type.
4570 Make sure we have a valid type for the function to return. */
4571 if (type == error_mark_node)
4576 /* Warn about some types functions can't return. */
4578 if (TREE_CODE (type) == FUNCTION_TYPE)
4580 error ("`%s' declared as function returning a function", name);
4581 type = integer_type_node;
4583 if (TREE_CODE (type) == ARRAY_TYPE)
4585 error ("`%s' declared as function returning an array", name);
4586 type = integer_type_node;
4589 #ifndef TRADITIONAL_RETURN_FLOAT
4590 /* Traditionally, declaring return type float means double. */
4592 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4593 type = double_type_node;
4594 #endif /* TRADITIONAL_RETURN_FLOAT */
4596 /* Construct the function type and go to the next
4597 inner layer of declarator. */
4599 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4601 /* Say it's a definition
4602 only for the CALL_EXPR
4603 closest to the identifier. */
4604 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4605 /* Type qualifiers before the return type of the function
4606 qualify the return type, not the function type. */
4609 /* Type qualifiers on a function return type are normally
4610 permitted by the standard but have no effect, so give a
4611 warning at -W. Qualifiers on a void return type have
4612 meaning as a GNU extension, and are banned on function
4613 definitions in ISO C. FIXME: strictly we shouldn't
4614 pedwarn for qualified void return types except on function
4615 definitions, but not doing so could lead to the undesirable
4616 state of a "volatile void" function return type not being
4617 warned about, and a use of the function being compiled
4618 with GNU semantics, with no diagnostics under -pedantic. */
4619 if (VOID_TYPE_P (type) && pedantic && !in_system_header)
4620 pedwarn ("ISO C forbids qualified void function return type");
4621 else if (extra_warnings
4622 && !(VOID_TYPE_P (type)
4623 && type_quals == TYPE_QUAL_VOLATILE))
4624 warning ("type qualifiers ignored on function return type");
4626 type = c_build_qualified_type (type, type_quals);
4628 type_quals = TYPE_UNQUALIFIED;
4630 type = build_function_type (type, arg_types);
4631 declarator = TREE_OPERAND (declarator, 0);
4633 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4634 the formal parameter list of this FUNCTION_TYPE to point to
4635 the FUNCTION_TYPE node itself. */
4640 for (link = last_function_parm_tags;
4642 link = TREE_CHAIN (link))
4643 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4646 else if (TREE_CODE (declarator) == INDIRECT_REF)
4648 /* Merge any constancy or volatility into the target type
4651 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4653 pedwarn ("ISO C forbids qualified function types");
4655 type = c_build_qualified_type (type, type_quals);
4656 type_quals = TYPE_UNQUALIFIED;
4659 type = build_pointer_type (type);
4661 /* Process a list of type modifier keywords
4662 (such as const or volatile) that were given inside the `*'. */
4664 if (TREE_TYPE (declarator))
4672 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4673 typemodlist = TREE_CHAIN (typemodlist))
4675 tree qualifier = TREE_VALUE (typemodlist);
4677 if (C_IS_RESERVED_WORD (qualifier))
4679 if (C_RID_CODE (qualifier) == RID_CONST)
4681 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4683 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4693 error ("invalid type modifier within pointer declarator");
4694 if (constp > 1 && ! flag_isoc99)
4695 pedwarn ("duplicate `const'");
4696 if (volatilep > 1 && ! flag_isoc99)
4697 pedwarn ("duplicate `volatile'");
4698 if (restrictp > 1 && ! flag_isoc99)
4699 pedwarn ("duplicate `restrict'");
4701 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4702 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4703 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4706 declarator = TREE_OPERAND (declarator, 0);
4713 /* Now TYPE has the actual type. */
4715 /* Did array size calculations overflow? */
4717 if (TREE_CODE (type) == ARRAY_TYPE
4718 && COMPLETE_TYPE_P (type)
4719 && TREE_OVERFLOW (TYPE_SIZE (type)))
4721 error ("size of array `%s' is too large", name);
4722 /* If we proceed with the array type as it is, we'll eventually
4723 crash in tree_low_cst(). */
4724 type = error_mark_node;
4727 /* If this is declaring a typedef name, return a TYPE_DECL. */
4729 if (specbits & (1 << (int) RID_TYPEDEF))
4732 /* Note that the grammar rejects storage classes
4733 in typenames, fields or parameters */
4734 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4736 pedwarn ("ISO C forbids qualified function types");
4738 type = c_build_qualified_type (type, type_quals);
4739 decl = build_decl (TYPE_DECL, declarator, type);
4740 if ((specbits & (1 << (int) RID_SIGNED))
4741 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4742 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4743 decl_attributes (&decl, returned_attrs, 0);
4747 /* Detect the case of an array type of unspecified size
4748 which came, as such, direct from a typedef name.
4749 We must copy the type, so that each identifier gets
4750 a distinct type, so that each identifier's size can be
4751 controlled separately by its own initializer. */
4753 if (type != 0 && typedef_type != 0
4754 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4755 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4757 type = build_array_type (TREE_TYPE (type), 0);
4759 C_TYPE_VARIABLE_SIZE (type) = 1;
4762 /* If this is a type name (such as, in a cast or sizeof),
4763 compute the type and return it now. */
4765 if (decl_context == TYPENAME)
4767 /* Note that the grammar rejects storage classes
4768 in typenames, fields or parameters */
4769 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4771 pedwarn ("ISO C forbids const or volatile function types");
4773 type = c_build_qualified_type (type, type_quals);
4774 decl_attributes (&type, returned_attrs, 0);
4778 /* Aside from typedefs and type names (handle above),
4779 `void' at top level (not within pointer)
4780 is allowed only in public variables.
4781 We don't complain about parms either, but that is because
4782 a better error message can be made later. */
4784 if (VOID_TYPE_P (type) && decl_context != PARM
4785 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4786 && ((specbits & (1 << (int) RID_EXTERN))
4787 || (current_binding_level == global_binding_level
4789 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4791 error ("variable or field `%s' declared void", name);
4792 type = integer_type_node;
4795 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4796 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4801 if (decl_context == PARM)
4803 tree type_as_written;
4806 /* A parameter declared as an array of T is really a pointer to T.
4807 One declared as a function is really a pointer to a function. */
4809 if (TREE_CODE (type) == ARRAY_TYPE)
4811 /* Transfer const-ness of array into that of type pointed to. */
4812 type = TREE_TYPE (type);
4814 type = c_build_qualified_type (type, type_quals);
4815 type = build_pointer_type (type);
4816 type_quals = TYPE_UNQUALIFIED;
4817 if (array_ptr_quals)
4819 tree new_ptr_quals, new_ptr_attrs;
4821 split_specs_attrs (array_ptr_quals, &new_ptr_quals, &new_ptr_attrs);
4822 /* We don't yet implement attributes in this context. */
4823 if (new_ptr_attrs != NULL_TREE)
4824 warning ("attributes in parameter array declarator ignored");
4829 for (; new_ptr_quals; new_ptr_quals = TREE_CHAIN (new_ptr_quals))
4831 tree qualifier = TREE_VALUE (new_ptr_quals);
4833 if (C_IS_RESERVED_WORD (qualifier))
4835 if (C_RID_CODE (qualifier) == RID_CONST)
4837 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4839 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4849 error ("invalid type modifier within array declarator");
4851 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4852 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4853 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4857 else if (TREE_CODE (type) == FUNCTION_TYPE)
4859 if (pedantic && type_quals)
4860 pedwarn ("ISO C forbids qualified function types");
4862 type = c_build_qualified_type (type, type_quals);
4863 type = build_pointer_type (type);
4864 type_quals = TYPE_UNQUALIFIED;
4866 else if (type_quals)
4867 type = c_build_qualified_type (type, type_quals);
4869 type_as_written = type;
4871 decl = build_decl (PARM_DECL, declarator, type);
4873 C_DECL_VARIABLE_SIZE (decl) = 1;
4875 /* Compute the type actually passed in the parmlist,
4876 for the case where there is no prototype.
4877 (For example, shorts and chars are passed as ints.)
4878 When there is a prototype, this is overridden later. */
4880 if (type == error_mark_node)
4881 promoted_type = type;
4884 promoted_type = simple_type_promotes_to (type);
4885 if (! promoted_type)
4886 promoted_type = type;
4889 DECL_ARG_TYPE (decl) = promoted_type;
4890 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4892 else if (decl_context == FIELD)
4894 /* Structure field. It may not be a function. */
4896 if (TREE_CODE (type) == FUNCTION_TYPE)
4898 error ("field `%s' declared as a function", name);
4899 type = build_pointer_type (type);
4901 else if (TREE_CODE (type) != ERROR_MARK
4902 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4904 error ("field `%s' has incomplete type", name);
4905 type = error_mark_node;
4907 /* Move type qualifiers down to element of an array. */
4908 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4910 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4912 TYPE_DOMAIN (type));
4914 /* Leave the field const or volatile as well. */
4915 type_quals = TYPE_UNQUALIFIED;
4918 decl = build_decl (FIELD_DECL, declarator, type);
4919 DECL_NONADDRESSABLE_P (decl) = bitfield;
4922 C_DECL_VARIABLE_SIZE (decl) = 1;
4924 else if (TREE_CODE (type) == FUNCTION_TYPE)
4926 /* Every function declaration is "external"
4927 except for those which are inside a function body
4928 in which `auto' is used.
4929 That is a case not specified by ANSI C,
4930 and we use it for forward declarations for nested functions. */
4931 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4932 || current_binding_level == global_binding_level);
4934 if (specbits & (1 << (int) RID_AUTO)
4935 && (pedantic || current_binding_level == global_binding_level))
4936 pedwarn ("invalid storage class for function `%s'", name);
4937 if (specbits & (1 << (int) RID_REGISTER))
4938 error ("invalid storage class for function `%s'", name);
4939 /* Function declaration not at top level.
4940 Storage classes other than `extern' are not allowed
4941 and `extern' makes no difference. */
4942 if (current_binding_level != global_binding_level
4943 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4945 pedwarn ("invalid storage class for function `%s'", name);
4947 decl = build_decl (FUNCTION_DECL, declarator, type);
4948 decl = build_decl_attribute_variant (decl, decl_attr);
4950 DECL_LANG_SPECIFIC (decl) = (struct lang_decl *)
4951 ggc_alloc_cleared (sizeof (struct lang_decl));
4953 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4954 pedwarn ("ISO C forbids qualified function types");
4956 /* GNU C interprets a `volatile void' return type to indicate
4957 that the function does not return. */
4958 if ((type_quals & TYPE_QUAL_VOLATILE)
4959 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4960 warning ("`noreturn' function returns non-void value");
4963 DECL_EXTERNAL (decl) = 1;
4964 /* Record absence of global scope for `static' or `auto'. */
4966 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4968 /* Record presence of `inline', if it is reasonable. */
4969 if (MAIN_NAME_P (declarator))
4972 warning ("cannot inline function `main'");
4976 /* Assume that otherwise the function can be inlined. */
4977 DECL_INLINE (decl) = 1;
4978 DECL_DECLARED_INLINE_P (decl) = 1;
4980 if (specbits & (1 << (int) RID_EXTERN))
4981 current_extern_inline = 1;
4983 /* If -finline-functions, assume it can be inlined. This does
4984 two things: let the function be deferred until it is actually
4985 needed, and let dwarf2 know that the function is inlinable. */
4986 else if (flag_inline_trees == 2)
4988 DECL_INLINE (decl) = 1;
4989 DECL_DECLARED_INLINE_P (decl) = 0;
4994 /* It's a variable. */
4995 /* An uninitialized decl with `extern' is a reference. */
4996 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4998 /* Move type qualifiers down to element of an array. */
4999 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
5001 int saved_align = TYPE_ALIGN(type);
5002 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
5004 TYPE_DOMAIN (type));
5005 TYPE_ALIGN (type) = saved_align;
5006 #if 0 /* Leave the variable const or volatile as well. */
5007 type_quals = TYPE_UNQUALIFIED;
5010 else if (type_quals)
5011 type = c_build_qualified_type (type, type_quals);
5013 decl = build_decl (VAR_DECL, declarator, type);
5015 C_DECL_VARIABLE_SIZE (decl) = 1;
5018 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
5020 DECL_EXTERNAL (decl) = extern_ref;
5021 /* At top level, the presence of a `static' or `register' storage
5022 class specifier, or the absence of all storage class specifiers
5023 makes this declaration a definition (perhaps tentative). Also,
5024 the absence of both `static' and `register' makes it public. */
5025 if (current_binding_level == global_binding_level)
5029 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
5030 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
5032 /* Not at top level, only `static' makes a static definition. */
5035 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
5036 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
5040 /* Record `register' declaration for warnings on &
5041 and in case doing stupid register allocation. */
5043 if (specbits & (1 << (int) RID_REGISTER))
5044 DECL_REGISTER (decl) = 1;
5046 /* Record constancy and volatility. */
5047 c_apply_type_quals_to_decl (type_quals, decl);
5049 /* If a type has volatile components, it should be stored in memory.
5050 Otherwise, the fact that those components are volatile
5051 will be ignored, and would even crash the compiler. */
5052 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
5053 mark_addressable (decl);
5055 decl_attributes (&decl, returned_attrs, 0);
5061 /* Decode the parameter-list info for a function type or function definition.
5062 The argument is the value returned by `get_parm_info' (or made in parse.y
5063 if there is an identifier list instead of a parameter decl list).
5064 These two functions are separate because when a function returns
5065 or receives functions then each is called multiple times but the order
5066 of calls is different. The last call to `grokparms' is always the one
5067 that contains the formal parameter names of a function definition.
5069 Store in `last_function_parms' a chain of the decls of parms.
5070 Also store in `last_function_parm_tags' a chain of the struct, union,
5071 and enum tags declared among the parms.
5073 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5075 FUNCDEF_FLAG is nonzero for a function definition, 0 for
5076 a mere declaration. A nonempty identifier-list gets an error message
5077 when FUNCDEF_FLAG is zero. */
5080 grokparms (parms_info, funcdef_flag)
5084 tree first_parm = TREE_CHAIN (parms_info);
5086 last_function_parms = TREE_PURPOSE (parms_info);
5087 last_function_parm_tags = TREE_VALUE (parms_info);
5089 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
5090 && !in_system_header)
5091 warning ("function declaration isn't a prototype");
5094 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
5097 pedwarn ("parameter names (without types) in function declaration");
5099 last_function_parms = first_parm;
5106 /* We no longer test FUNCDEF_FLAG.
5107 If the arg types are incomplete in a declaration,
5108 they must include undefined tags.
5109 These tags can never be defined in the scope of the declaration,
5110 so the types can never be completed,
5111 and no call can be compiled successfully. */
5113 /* In a fcn definition, arg types must be complete. */
5116 for (parm = last_function_parms, typelt = first_parm;
5118 parm = TREE_CHAIN (parm))
5119 /* Skip over any enumeration constants declared here. */
5120 if (TREE_CODE (parm) == PARM_DECL)
5122 /* Barf if the parameter itself has an incomplete type. */
5123 tree type = TREE_VALUE (typelt);
5124 if (type == error_mark_node)
5126 if (!COMPLETE_TYPE_P (type))
5128 if (funcdef_flag && DECL_NAME (parm) != 0)
5129 error ("parameter `%s' has incomplete type",
5130 IDENTIFIER_POINTER (DECL_NAME (parm)));
5132 warning ("parameter has incomplete type");
5135 TREE_VALUE (typelt) = error_mark_node;
5136 TREE_TYPE (parm) = error_mark_node;
5140 /* This has been replaced by parm_tags_warning, which
5141 uses a more accurate criterion for what to warn
5145 /* Now warn if is a pointer to an incomplete type. */
5146 while (TREE_CODE (type) == POINTER_TYPE
5147 || TREE_CODE (type) == REFERENCE_TYPE)
5148 type = TREE_TYPE (type);
5149 type = TYPE_MAIN_VARIANT (type);
5150 if (!COMPLETE_TYPE_P (type))
5152 if (DECL_NAME (parm) != 0)
5153 warning ("parameter `%s' points to incomplete type",
5154 IDENTIFIER_POINTER (DECL_NAME (parm)));
5156 warning ("parameter points to incomplete type");
5160 typelt = TREE_CHAIN (typelt);
5167 /* Return a tree_list node with info on a parameter list just parsed.
5168 The TREE_PURPOSE is a chain of decls of those parms.
5169 The TREE_VALUE is a list of structure, union and enum tags defined.
5170 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5171 This tree_list node is later fed to `grokparms'.
5173 VOID_AT_END nonzero means append `void' to the end of the type-list.
5174 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5177 get_parm_info (void_at_end)
5183 tree tags = gettags ();
5184 tree parms = getdecls ();
5186 tree order = current_binding_level->parm_order;
5188 /* Just `void' (and no ellipsis) is special. There are really no parms.
5189 But if the `void' is qualified (by `const' or `volatile') or has a
5190 storage class specifier (`register'), then the behavior is undefined;
5191 by not counting it as the special case of `void' we will cause an
5192 error later. Typedefs for `void' are OK (see DR#157). */
5193 if (void_at_end && parms != 0
5194 && TREE_CHAIN (parms) == 0
5195 && VOID_TYPE_P (TREE_TYPE (parms))
5196 && ! TREE_THIS_VOLATILE (parms)
5197 && ! TREE_READONLY (parms)
5198 && ! DECL_REGISTER (parms)
5199 && DECL_NAME (parms) == 0)
5202 storedecls (NULL_TREE);
5203 return tree_cons (NULL_TREE, NULL_TREE,
5204 tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5207 /* Extract enumerator values and other non-parms declared with the parms.
5208 Likewise any forward parm decls that didn't have real parm decls. */
5209 for (decl = parms; decl;)
5211 tree next = TREE_CHAIN (decl);
5213 if (TREE_CODE (decl) != PARM_DECL)
5215 TREE_CHAIN (decl) = new_parms;
5218 else if (TREE_ASM_WRITTEN (decl))
5220 error_with_decl (decl,
5221 "parameter `%s' has just a forward declaration");
5222 TREE_CHAIN (decl) = new_parms;
5228 /* Put the parm decls back in the order they were in in the parm list. */
5229 for (t = order; t; t = TREE_CHAIN (t))
5232 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5234 TREE_CHAIN (TREE_VALUE (t)) = 0;
5237 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5240 /* Store the parmlist in the binding level since the old one
5241 is no longer a valid list. (We have changed the chain pointers.) */
5242 storedecls (new_parms);
5244 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5245 /* There may also be declarations for enumerators if an enumeration
5246 type is declared among the parms. Ignore them here. */
5247 if (TREE_CODE (decl) == PARM_DECL)
5249 /* Since there is a prototype,
5250 args are passed in their declared types. */
5251 tree type = TREE_TYPE (decl);
5252 DECL_ARG_TYPE (decl) = type;
5253 if (PROMOTE_PROTOTYPES
5254 && INTEGRAL_TYPE_P (type)
5255 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5256 DECL_ARG_TYPE (decl) = integer_type_node;
5258 types = tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5259 if (VOID_TYPE_P (TREE_VALUE (types)) && ! erred
5260 && DECL_NAME (decl) == 0)
5262 error ("`void' in parameter list must be the entire list");
5268 return tree_cons (new_parms, tags,
5269 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
5271 return tree_cons (new_parms, tags, nreverse (types));
5274 /* At end of parameter list, warn about any struct, union or enum tags
5275 defined within. Do so because these types cannot ever become complete. */
5278 parmlist_tags_warning ()
5283 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5285 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5286 /* An anonymous union parm type is meaningful as a GNU extension.
5287 So don't warn for that. */
5288 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5290 if (TREE_PURPOSE (elt) != 0)
5292 if (code == RECORD_TYPE)
5293 warning ("`struct %s' declared inside parameter list",
5294 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5295 else if (code == UNION_TYPE)
5296 warning ("`union %s' declared inside parameter list",
5297 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5299 warning ("`enum %s' declared inside parameter list",
5300 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5304 /* For translation these need to be separate warnings */
5305 if (code == RECORD_TYPE)
5306 warning ("anonymous struct declared inside parameter list");
5307 else if (code == UNION_TYPE)
5308 warning ("anonymous union declared inside parameter list");
5310 warning ("anonymous enum declared inside parameter list");
5314 warning ("its scope is only this definition or declaration, which is probably not what you want.");
5320 /* Get the struct, enum or union (CODE says which) with tag NAME.
5321 Define the tag as a forward-reference if it is not defined. */
5324 xref_tag (code, name)
5325 enum tree_code code;
5328 /* If a cross reference is requested, look up the type
5329 already defined for this tag and return it. */
5331 tree ref = lookup_tag (code, name, current_binding_level, 0);
5332 /* If this is the right type of tag, return what we found.
5333 (This reference will be shadowed by shadow_tag later if appropriate.)
5334 If this is the wrong type of tag, do not return it. If it was the
5335 wrong type in the same binding level, we will have had an error
5336 message already; if in a different binding level and declaring
5337 a name, pending_xref_error will give an error message; but if in a
5338 different binding level and not declaring a name, this tag should
5339 shadow the previous declaration of a different type of tag, and
5340 this would not work properly if we return the reference found.
5341 (For example, with "struct foo" in an outer scope, "union foo;"
5342 must shadow that tag with a new one of union type.) */
5343 if (ref && TREE_CODE (ref) == code)
5346 /* If no such tag is yet defined, create a forward-reference node
5347 and record it as the "definition".
5348 When a real declaration of this type is found,
5349 the forward-reference will be altered into a real type. */
5351 ref = make_node (code);
5352 if (code == ENUMERAL_TYPE)
5354 /* Give the type a default layout like unsigned int
5355 to avoid crashing if it does not get defined. */
5356 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5357 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5358 TYPE_USER_ALIGN (ref) = 0;
5359 TREE_UNSIGNED (ref) = 1;
5360 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5361 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5362 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5365 pushtag (name, ref);
5370 /* Make sure that the tag NAME is defined *in the current binding level*
5371 at least as a forward reference.
5372 CODE says which kind of tag NAME ought to be. */
5375 start_struct (code, name)
5376 enum tree_code code;
5379 /* If there is already a tag defined at this binding level
5380 (as a forward reference), just return it. */
5385 ref = lookup_tag (code, name, current_binding_level, 1);
5386 if (ref && TREE_CODE (ref) == code)
5388 C_TYPE_BEING_DEFINED (ref) = 1;
5389 TYPE_PACKED (ref) = flag_pack_struct;
5390 if (TYPE_FIELDS (ref))
5392 if (code == UNION_TYPE)
5393 error ("redefinition of `union %s'",
5394 IDENTIFIER_POINTER (name));
5396 error ("redefinition of `struct %s'",
5397 IDENTIFIER_POINTER (name));
5403 /* Otherwise create a forward-reference just so the tag is in scope. */
5405 ref = make_node (code);
5406 pushtag (name, ref);
5407 C_TYPE_BEING_DEFINED (ref) = 1;
5408 TYPE_PACKED (ref) = flag_pack_struct;
5412 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5413 of a structure component, returning a FIELD_DECL node.
5414 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5416 This is done during the parsing of the struct declaration.
5417 The FIELD_DECL nodes are chained together and the lot of them
5418 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5421 grokfield (filename, line, declarator, declspecs, width)
5422 const char *filename ATTRIBUTE_UNUSED;
5423 int line ATTRIBUTE_UNUSED;
5424 tree declarator, declspecs, width;
5428 if (declarator == NULL_TREE && width == NULL_TREE)
5430 /* This is an unnamed decl. We only support unnamed
5431 structs/unions, so check for other things and refuse them. */
5432 if (TREE_CODE (TREE_VALUE (declspecs)) != RECORD_TYPE
5433 && TREE_CODE (TREE_VALUE (declspecs)) != UNION_TYPE)
5435 error ("unnamed fields of type other than struct or union are not allowed");
5440 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5442 finish_decl (value, NULL_TREE, NULL_TREE);
5443 DECL_INITIAL (value) = width;
5445 maybe_objc_check_decl (value);
5449 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5450 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5451 ATTRIBUTES are attributes to be applied to the structure. */
5454 finish_struct (t, fieldlist, attributes)
5460 int toplevel = global_binding_level == current_binding_level;
5461 int saw_named_field;
5463 /* If this type was previously laid out as a forward reference,
5464 make sure we lay it out again. */
5468 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5470 /* Nameless union parm types are useful as GCC extension. */
5471 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5472 /* Otherwise, warn about any struct or union def. in parmlist. */
5473 if (in_parm_level_p ())
5476 pedwarn ("%s defined inside parms",
5477 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5478 else if (! flag_traditional)
5479 warning ("%s defined inside parms",
5480 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5485 for (x = fieldlist; x; x = TREE_CHAIN (x))
5486 if (DECL_NAME (x) != 0)
5490 pedwarn ("%s has no %s",
5491 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
5492 fieldlist ? _("named members") : _("members"));
5495 /* Install struct as DECL_CONTEXT of each field decl.
5496 Also process specified field sizes,m which is found in the DECL_INITIAL.
5497 Store 0 there, except for ": 0" fields (so we can find them
5498 and delete them, below). */
5500 saw_named_field = 0;
5501 for (x = fieldlist; x; x = TREE_CHAIN (x))
5503 DECL_CONTEXT (x) = t;
5504 DECL_PACKED (x) |= TYPE_PACKED (t);
5506 /* If any field is const, the structure type is pseudo-const. */
5507 if (TREE_READONLY (x))
5508 C_TYPE_FIELDS_READONLY (t) = 1;
5511 /* A field that is pseudo-const makes the structure likewise. */
5512 tree t1 = TREE_TYPE (x);
5513 while (TREE_CODE (t1) == ARRAY_TYPE)
5514 t1 = TREE_TYPE (t1);
5515 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5516 && C_TYPE_FIELDS_READONLY (t1))
5517 C_TYPE_FIELDS_READONLY (t) = 1;
5520 /* Any field that is volatile means variables of this type must be
5521 treated in some ways as volatile. */
5522 if (TREE_THIS_VOLATILE (x))
5523 C_TYPE_FIELDS_VOLATILE (t) = 1;
5525 /* Any field of nominal variable size implies structure is too. */
5526 if (C_DECL_VARIABLE_SIZE (x))
5527 C_TYPE_VARIABLE_SIZE (t) = 1;
5529 /* Detect invalid nested redefinition. */
5530 if (TREE_TYPE (x) == t)
5531 error ("nested redefinition of `%s'",
5532 IDENTIFIER_POINTER (TYPE_NAME (t)));
5534 /* Detect invalid bit-field size. */
5535 if (DECL_INITIAL (x))
5536 STRIP_NOPS (DECL_INITIAL (x));
5537 if (DECL_INITIAL (x))
5539 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5540 constant_expression_warning (DECL_INITIAL (x));
5544 "bit-field `%s' width not an integer constant");
5545 DECL_INITIAL (x) = NULL;
5549 /* Detect invalid bit-field type. */
5550 if (DECL_INITIAL (x)
5551 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5552 && TREE_CODE (TREE_TYPE (x)) != BOOLEAN_TYPE
5553 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5555 error_with_decl (x, "bit-field `%s' has invalid type");
5556 DECL_INITIAL (x) = NULL;
5559 if (DECL_INITIAL (x) && pedantic
5560 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5561 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5562 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != c_bool_type_node
5563 /* Accept an enum that's equivalent to int or unsigned int. */
5564 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5565 && (TYPE_PRECISION (TREE_TYPE (x))
5566 == TYPE_PRECISION (integer_type_node))))
5567 pedwarn_with_decl (x, "bit-field `%s' type invalid in ISO C");
5569 /* Detect and ignore out of range field width and process valid
5571 if (DECL_INITIAL (x))
5574 if (TYPE_MAIN_VARIANT (TREE_TYPE (x)) == c_bool_type_node)
5575 max_width = CHAR_TYPE_SIZE;
5577 max_width = TYPE_PRECISION (TREE_TYPE (x));
5578 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5579 error_with_decl (x, "negative width in bit-field `%s'");
5580 else if (0 < compare_tree_int (DECL_INITIAL (x), max_width))
5581 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5582 else if (integer_zerop (DECL_INITIAL (x)) && DECL_NAME (x) != 0)
5583 error_with_decl (x, "zero width for bit-field `%s'");
5586 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
5587 unsigned HOST_WIDE_INT width
5588 = TREE_INT_CST_LOW (DECL_INITIAL (x));
5590 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5591 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5592 TREE_UNSIGNED (TREE_TYPE (x)))
5594 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5595 TREE_UNSIGNED (TREE_TYPE (x))))))
5596 warning_with_decl (x,
5597 "`%s' is narrower than values of its type");
5599 DECL_SIZE (x) = bitsize_int (width);
5600 DECL_BIT_FIELD (x) = 1;
5601 SET_DECL_C_BIT_FIELD (x);
5605 /* field size 0 => force desired amount of alignment. */
5606 #ifdef EMPTY_FIELD_BOUNDARY
5607 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5609 #ifdef PCC_BITFIELD_TYPE_MATTERS
5610 if (PCC_BITFIELD_TYPE_MATTERS)
5612 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5613 TYPE_ALIGN (TREE_TYPE (x)));
5614 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5621 else if (TREE_TYPE (x) != error_mark_node)
5623 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5624 : TYPE_ALIGN (TREE_TYPE (x)));
5626 /* Non-bit-fields are aligned for their type, except packed
5627 fields which require only BITS_PER_UNIT alignment. */
5628 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5629 if (! DECL_PACKED (x))
5630 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5633 DECL_INITIAL (x) = 0;
5635 /* Detect flexible array member in an invalid context. */
5636 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5637 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5638 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5639 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5641 if (TREE_CODE (t) == UNION_TYPE)
5642 error_with_decl (x, "flexible array member in union");
5643 else if (TREE_CHAIN (x) != NULL_TREE)
5644 error_with_decl (x, "flexible array member not at end of struct");
5645 else if (! saw_named_field)
5646 error_with_decl (x, "flexible array member in otherwise empty struct");
5649 saw_named_field = 1;
5652 /* Delete all duplicate fields from the fieldlist */
5653 for (x = fieldlist; x && TREE_CHAIN (x);)
5654 /* Anonymous fields aren't duplicates. */
5655 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5663 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5669 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5671 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5672 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5678 /* Now we have the nearly final fieldlist. Record it,
5679 then lay out the structure or union (including the fields). */
5681 TYPE_FIELDS (t) = fieldlist;
5685 /* Delete all zero-width bit-fields from the fieldlist */
5687 tree *fieldlistp = &fieldlist;
5689 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5690 *fieldlistp = TREE_CHAIN (*fieldlistp);
5692 fieldlistp = &TREE_CHAIN (*fieldlistp);
5695 /* Now we have the truly final field list.
5696 Store it in this type and in the variants. */
5698 TYPE_FIELDS (t) = fieldlist;
5700 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5702 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5703 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5704 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5705 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5708 /* If this was supposed to be a transparent union, but we can't
5709 make it one, warn and turn off the flag. */
5710 if (TREE_CODE (t) == UNION_TYPE
5711 && TYPE_TRANSPARENT_UNION (t)
5712 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5714 TYPE_TRANSPARENT_UNION (t) = 0;
5715 warning ("union cannot be made transparent");
5718 /* If this structure or union completes the type of any previous
5719 variable declaration, lay it out and output its rtl. */
5721 if (current_binding_level->n_incomplete != 0)
5724 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5726 if (TYPE_MAIN_VARIANT (TREE_TYPE (decl)) == TYPE_MAIN_VARIANT (t)
5727 && TREE_CODE (decl) != TYPE_DECL)
5729 layout_decl (decl, 0);
5730 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5731 maybe_objc_check_decl (decl);
5732 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5735 --current_binding_level->n_incomplete;
5737 else if (!COMPLETE_TYPE_P (TREE_TYPE (decl))
5738 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5740 tree element = TREE_TYPE (decl);
5741 while (TREE_CODE (element) == ARRAY_TYPE)
5742 element = TREE_TYPE (element);
5744 layout_array_type (TREE_TYPE (decl));
5749 /* Finish debugging output for this type. */
5750 rest_of_type_compilation (t, toplevel);
5755 /* Lay out the type T, and its element type, and so on. */
5758 layout_array_type (t)
5761 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5762 layout_array_type (TREE_TYPE (t));
5766 /* Begin compiling the definition of an enumeration type.
5767 NAME is its name (or null if anonymous).
5768 Returns the type object, as yet incomplete.
5769 Also records info about it so that build_enumerator
5770 may be used to declare the individual values as they are read. */
5778 /* If this is the real definition for a previous forward reference,
5779 fill in the contents in the same object that used to be the
5780 forward reference. */
5783 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5785 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5787 enumtype = make_node (ENUMERAL_TYPE);
5788 pushtag (name, enumtype);
5791 C_TYPE_BEING_DEFINED (enumtype) = 1;
5793 if (TYPE_VALUES (enumtype) != 0)
5795 /* This enum is a named one that has been declared already. */
5796 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5798 /* Completely replace its old definition.
5799 The old enumerators remain defined, however. */
5800 TYPE_VALUES (enumtype) = 0;
5803 enum_next_value = integer_zero_node;
5806 if (flag_short_enums)
5807 TYPE_PACKED (enumtype) = 1;
5812 /* After processing and defining all the values of an enumeration type,
5813 install their decls in the enumeration type and finish it off.
5814 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5815 and ATTRIBUTES are the specified attributes.
5816 Returns ENUMTYPE. */
5819 finish_enum (enumtype, values, attributes)
5825 tree minnode = 0, maxnode = 0, enum_value_type;
5826 int precision, unsign;
5827 int toplevel = (global_binding_level == current_binding_level);
5829 if (in_parm_level_p ())
5830 warning ("enum defined inside parms");
5832 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5834 /* Calculate the maximum value of any enumerator in this type. */
5836 if (values == error_mark_node)
5837 minnode = maxnode = integer_zero_node;
5840 minnode = maxnode = TREE_VALUE (values);
5841 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5843 tree value = TREE_VALUE (pair);
5844 if (tree_int_cst_lt (maxnode, value))
5846 if (tree_int_cst_lt (value, minnode))
5851 /* Construct the final type of this enumeration. It is the same
5852 as one of the integral types - the narrowest one that fits, except
5853 that normally we only go as narrow as int - and signed iff any of
5854 the values are negative. */
5855 unsign = (tree_int_cst_sgn (minnode) >= 0);
5856 precision = MAX (min_precision (minnode, unsign),
5857 min_precision (maxnode, unsign));
5858 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5860 tree narrowest = type_for_size (precision, unsign);
5863 warning ("enumeration values exceed range of largest integer");
5864 narrowest = long_long_integer_type_node;
5867 precision = TYPE_PRECISION (narrowest);
5870 precision = TYPE_PRECISION (integer_type_node);
5872 if (precision == TYPE_PRECISION (integer_type_node))
5873 enum_value_type = type_for_size (precision, 0);
5875 enum_value_type = enumtype;
5877 TYPE_MIN_VALUE (enumtype) = minnode;
5878 TYPE_MAX_VALUE (enumtype) = maxnode;
5879 TYPE_PRECISION (enumtype) = precision;
5880 TREE_UNSIGNED (enumtype) = unsign;
5881 TYPE_SIZE (enumtype) = 0;
5882 layout_type (enumtype);
5884 if (values != error_mark_node)
5886 /* Change the type of the enumerators to be the enum type. We
5887 need to do this irrespective of the size of the enum, for
5888 proper type checking. Replace the DECL_INITIALs of the
5889 enumerators, and the value slots of the list, with copies
5890 that have the enum type; they cannot be modified in place
5891 because they may be shared (e.g. integer_zero_node) Finally,
5892 change the purpose slots to point to the names of the decls. */
5893 for (pair = values; pair; pair = TREE_CHAIN (pair))
5895 tree enu = TREE_PURPOSE (pair);
5897 TREE_TYPE (enu) = enumtype;
5898 DECL_SIZE (enu) = TYPE_SIZE (enumtype);
5899 DECL_SIZE_UNIT (enu) = TYPE_SIZE_UNIT (enumtype);
5900 DECL_ALIGN (enu) = TYPE_ALIGN (enumtype);
5901 DECL_USER_ALIGN (enu) = TYPE_USER_ALIGN (enumtype);
5902 DECL_MODE (enu) = TYPE_MODE (enumtype);
5904 /* The ISO C Standard mandates enumerators to have type int,
5905 even though the underlying type of an enum type is
5906 unspecified. Here we convert any enumerators that fit in
5907 an int to type int, to avoid promotions to unsigned types
5908 when comparing integers with enumerators that fit in the
5909 int range. When -pedantic is given, build_enumerator()
5910 would have already taken care of those that don't fit. */
5911 if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
5912 DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
5914 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5916 TREE_PURPOSE (pair) = DECL_NAME (enu);
5917 TREE_VALUE (pair) = DECL_INITIAL (enu);
5920 TYPE_VALUES (enumtype) = values;
5923 /* Fix up all variant types of this enum type. */
5924 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5926 if (tem == enumtype)
5928 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5929 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5930 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5931 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5932 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5933 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5934 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5935 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5936 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5937 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5940 /* Finish debugging output for this type. */
5941 rest_of_type_compilation (enumtype, toplevel);
5946 /* Build and install a CONST_DECL for one value of the
5947 current enumeration type (one that was begun with start_enum).
5948 Return a tree-list containing the CONST_DECL and its value.
5949 Assignment of sequential values by default is handled here. */
5952 build_enumerator (name, value)
5957 /* Validate and default VALUE. */
5959 /* Remove no-op casts from the value. */
5961 STRIP_TYPE_NOPS (value);
5965 if (TREE_CODE (value) == INTEGER_CST)
5967 value = default_conversion (value);
5968 constant_expression_warning (value);
5972 error ("enumerator value for `%s' not integer constant",
5973 IDENTIFIER_POINTER (name));
5978 /* Default based on previous value. */
5979 /* It should no longer be possible to have NON_LVALUE_EXPR
5983 value = enum_next_value;
5985 error ("overflow in enumeration values");
5988 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5990 pedwarn ("ISO C restricts enumerator values to range of `int'");
5991 value = convert (integer_type_node, value);
5994 /* Set basis for default for next value. */
5995 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5996 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5998 /* Now create a declaration for the enum value name. */
6000 type = TREE_TYPE (value);
6001 type = type_for_size (MAX (TYPE_PRECISION (type),
6002 TYPE_PRECISION (integer_type_node)),
6004 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
6005 && TREE_UNSIGNED (type)));
6007 decl = build_decl (CONST_DECL, name, type);
6008 DECL_INITIAL (decl) = convert (type, value);
6011 return tree_cons (decl, value, NULL_TREE);
6015 /* Create the FUNCTION_DECL for a function definition.
6016 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
6017 the declaration; they describe the function's name and the type it returns,
6018 but twisted together in a fashion that parallels the syntax of C.
6020 This function creates a binding context for the function body
6021 as well as setting up the FUNCTION_DECL in current_function_decl.
6023 Returns 1 on success. If the DECLARATOR is not suitable for a function
6024 (it defines a datum instead), we return 0, which tells
6025 yyparse to report a parse error. */
6028 start_function (declspecs, declarator, attributes)
6029 tree declarator, declspecs, attributes;
6031 tree decl1, old_decl;
6033 int old_immediate_size_expand = immediate_size_expand;
6035 current_function_returns_value = 0; /* Assume, until we see it does. */
6036 current_function_returns_null = 0;
6037 warn_about_return_type = 0;
6038 current_extern_inline = 0;
6039 c_function_varargs = 0;
6041 shadowed_labels = 0;
6043 /* Don't expand any sizes in the return type of the function. */
6044 immediate_size_expand = 0;
6046 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
6048 /* If the declarator is not suitable for a function definition,
6049 cause a syntax error. */
6052 immediate_size_expand = old_immediate_size_expand;
6056 decl_attributes (&decl1, attributes, 0);
6058 if (DECL_DECLARED_INLINE_P (decl1)
6059 && DECL_UNINLINABLE (decl1)
6060 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
6061 warning_with_decl (decl1,
6062 "inline function `%s' given attribute noinline");
6064 announce_function (decl1);
6066 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
6068 error ("return type is an incomplete type");
6069 /* Make it return void instead. */
6071 = build_function_type (void_type_node,
6072 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
6075 if (warn_about_return_type)
6076 pedwarn_c99 ("return type defaults to `int'");
6078 /* Save the parm names or decls from this function's declarator
6079 where store_parm_decls will find them. */
6080 current_function_parms = last_function_parms;
6081 current_function_parm_tags = last_function_parm_tags;
6083 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6084 error_mark_node is replaced below (in poplevel) with the BLOCK. */
6085 DECL_INITIAL (decl1) = error_mark_node;
6087 /* If this definition isn't a prototype and we had a prototype declaration
6088 before, copy the arg type info from that prototype.
6089 But not if what we had before was a builtin function. */
6090 old_decl = lookup_name_current_level (DECL_NAME (decl1));
6091 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
6092 && !DECL_BUILT_IN (old_decl)
6093 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6094 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
6095 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
6097 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
6098 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
6099 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
6102 /* If there is no explicit declaration, look for any out-of-scope implicit
6105 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
6107 /* Optionally warn of old-fashioned def with no previous prototype. */
6108 if (warn_strict_prototypes
6109 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6111 && (TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0
6112 || (DECL_BUILT_IN (old_decl)
6113 && ! C_DECL_ANTICIPATED (old_decl)))))
6114 warning ("function declaration isn't a prototype");
6115 /* Optionally warn of any global def with no previous prototype. */
6116 else if (warn_missing_prototypes
6117 && TREE_PUBLIC (decl1)
6119 && (TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0
6120 || (DECL_BUILT_IN (old_decl)
6121 && ! C_DECL_ANTICIPATED (old_decl))))
6122 && ! MAIN_NAME_P (DECL_NAME (decl1)))
6123 warning_with_decl (decl1, "no previous prototype for `%s'");
6124 /* Optionally warn of any def with no previous prototype
6125 if the function has already been used. */
6126 else if (warn_missing_prototypes
6127 && old_decl != 0 && TREE_USED (old_decl)
6128 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6129 warning_with_decl (decl1,
6130 "`%s' was used with no prototype before its definition");
6131 /* Optionally warn of any global def with no previous declaration. */
6132 else if (warn_missing_declarations
6133 && TREE_PUBLIC (decl1)
6135 && ! MAIN_NAME_P (DECL_NAME (decl1)))
6136 warning_with_decl (decl1, "no previous declaration for `%s'");
6137 /* Optionally warn of any def with no previous declaration
6138 if the function has already been used. */
6139 else if (warn_missing_declarations
6140 && old_decl != 0 && TREE_USED (old_decl)
6141 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
6142 warning_with_decl (decl1,
6143 "`%s' was used with no declaration before its definition");
6145 /* This is a definition, not a reference.
6146 So normally clear DECL_EXTERNAL.
6147 However, `extern inline' acts like a declaration
6148 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6149 DECL_EXTERNAL (decl1) = current_extern_inline;
6151 /* This function exists in static storage.
6152 (This does not mean `static' in the C sense!) */
6153 TREE_STATIC (decl1) = 1;
6155 /* A nested function is not global. */
6156 if (current_function_decl != 0)
6157 TREE_PUBLIC (decl1) = 0;
6159 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6160 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
6165 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6166 != integer_type_node)
6167 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
6169 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
6170 args = TREE_CHAIN (args))
6172 tree type = args ? TREE_VALUE (args) : 0;
6174 if (type == void_type_node)
6181 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6182 pedwarn_with_decl (decl1,
6183 "first argument of `%s' should be `int'");
6187 if (TREE_CODE (type) != POINTER_TYPE
6188 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6189 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6191 pedwarn_with_decl (decl1,
6192 "second argument of `%s' should be `char **'");
6196 if (TREE_CODE (type) != POINTER_TYPE
6197 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6198 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6200 pedwarn_with_decl (decl1,
6201 "third argument of `%s' should probably be `char **'");
6206 /* It is intentional that this message does not mention the third
6207 argument because it's only mentioned in an appendix of the
6209 if (argct > 0 && (argct < 2 || argct > 3))
6210 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
6212 if (! TREE_PUBLIC (decl1))
6213 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
6216 /* Record the decl so that the function name is defined.
6217 If we already have a decl for this name, and it is a FUNCTION_DECL,
6218 use the old decl. */
6220 current_function_decl = pushdecl (decl1);
6223 declare_parm_level (1);
6224 current_binding_level->subblocks_tag_transparent = 1;
6226 make_decl_rtl (current_function_decl, NULL);
6228 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6229 /* Promote the value to int before returning it. */
6230 if (c_promoting_integer_type_p (restype))
6232 /* It retains unsignedness if traditional
6233 or if not really getting wider. */
6234 if (TREE_UNSIGNED (restype)
6235 && (flag_traditional
6236 || (TYPE_PRECISION (restype)
6237 == TYPE_PRECISION (integer_type_node))))
6238 restype = unsigned_type_node;
6240 restype = integer_type_node;
6242 DECL_RESULT (current_function_decl)
6243 = build_decl (RESULT_DECL, NULL_TREE, restype);
6245 /* If this fcn was already referenced via a block-scope `extern' decl
6246 (or an implicit decl), propagate certain information about the usage. */
6247 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6248 TREE_ADDRESSABLE (current_function_decl) = 1;
6250 immediate_size_expand = old_immediate_size_expand;
6252 start_fname_decls ();
6257 /* Record that this function is going to be a varargs function.
6258 This is called before store_parm_decls, which is too early
6259 to call mark_varargs directly. */
6264 c_function_varargs = 1;
6267 /* Store the parameter declarations into the current function declaration.
6268 This is called after parsing the parameter declarations, before
6269 digesting the body of the function.
6271 For an old-style definition, modify the function's type
6272 to specify at least the number of arguments. */
6277 tree fndecl = current_function_decl;
6280 /* This is either a chain of PARM_DECLs (if a prototype was used)
6281 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6282 tree specparms = current_function_parms;
6284 /* This is a list of types declared among parms in a prototype. */
6285 tree parmtags = current_function_parm_tags;
6287 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6288 tree parmdecls = getdecls ();
6290 /* This is a chain of any other decls that came in among the parm
6291 declarations. If a parm is declared with enum {foo, bar} x;
6292 then CONST_DECLs for foo and bar are put here. */
6295 /* Nonzero if this definition is written with a prototype. */
6298 /* The function containing FNDECL, if any. */
6299 tree context = decl_function_context (fndecl);
6301 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6303 /* This case is when the function was defined with an ANSI prototype.
6304 The parms already have decls, so we need not do anything here
6305 except record them as in effect
6306 and complain if any redundant old-style parm decls were written. */
6317 error_with_decl (fndecl,
6318 "parm types given both in parmlist and separately");
6319 /* Get rid of the erroneous decls; don't keep them on
6320 the list of parms, since they might not be PARM_DECLs. */
6321 for (decl = current_binding_level->names;
6322 decl; decl = TREE_CHAIN (decl))
6323 if (DECL_NAME (decl))
6324 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6325 for (link = current_binding_level->shadowed;
6326 link; link = TREE_CHAIN (link))
6327 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6328 current_binding_level->names = 0;
6329 current_binding_level->shadowed = 0;
6332 specparms = nreverse (specparms);
6333 for (parm = specparms; parm; parm = next)
6335 next = TREE_CHAIN (parm);
6336 if (TREE_CODE (parm) == PARM_DECL)
6338 if (DECL_NAME (parm) == 0)
6339 error_with_decl (parm, "parameter name omitted");
6340 else if (TREE_CODE (TREE_TYPE (parm)) != ERROR_MARK
6341 && VOID_TYPE_P (TREE_TYPE (parm)))
6343 error_with_decl (parm, "parameter `%s' declared void");
6344 /* Change the type to error_mark_node so this parameter
6345 will be ignored by assign_parms. */
6346 TREE_TYPE (parm) = error_mark_node;
6352 /* If we find an enum constant or a type tag,
6353 put it aside for the moment. */
6354 TREE_CHAIN (parm) = 0;
6355 others = chainon (others, parm);
6359 /* Get the decls in their original chain order
6360 and record in the function. */
6361 DECL_ARGUMENTS (fndecl) = getdecls ();
6364 /* If this function takes a variable number of arguments,
6365 add a phony parameter to the end of the parm list,
6366 to represent the position of the first unnamed argument. */
6367 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6370 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6371 /* Let's hope the address of the unnamed parm
6372 won't depend on its type. */
6373 TREE_TYPE (dummy) = integer_type_node;
6374 DECL_ARG_TYPE (dummy) = integer_type_node;
6375 DECL_ARGUMENTS (fndecl) = chainon (DECL_ARGUMENTS (fndecl), dummy);
6379 /* Now pushdecl the enum constants. */
6380 for (parm = others; parm; parm = next)
6382 next = TREE_CHAIN (parm);
6383 if (DECL_NAME (parm) == 0)
6385 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6387 else if (TREE_CODE (parm) != PARM_DECL)
6391 storetags (chainon (parmtags, gettags ()));
6395 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6396 each with a parm name as the TREE_VALUE.
6398 PARMDECLS is a chain of declarations for parameters.
6399 Warning! It can also contain CONST_DECLs which are not parameters
6400 but are names of enumerators of any enum types
6401 declared among the parameters.
6403 First match each formal parameter name with its declaration.
6404 Associate decls with the names and store the decls
6405 into the TREE_PURPOSE slots. */
6407 /* We use DECL_WEAK as a flag to show which parameters have been
6408 seen already since it is not used on PARM_DECL or CONST_DECL. */
6409 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6410 DECL_WEAK (parm) = 0;
6412 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6414 tree tail, found = NULL;
6416 if (TREE_VALUE (parm) == 0)
6418 error_with_decl (fndecl,
6419 "parameter name missing from parameter list");
6420 TREE_PURPOSE (parm) = 0;
6424 /* See if any of the parmdecls specifies this parm by name.
6425 Ignore any enumerator decls. */
6426 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6427 if (DECL_NAME (tail) == TREE_VALUE (parm)
6428 && TREE_CODE (tail) == PARM_DECL)
6434 /* If declaration already marked, we have a duplicate name.
6435 Complain, and don't use this decl twice. */
6436 if (found && DECL_WEAK (found))
6438 error_with_decl (found, "multiple parameters named `%s'");
6442 /* If the declaration says "void", complain and ignore it. */
6443 if (found && VOID_TYPE_P (TREE_TYPE (found)))
6445 error_with_decl (found, "parameter `%s' declared void");
6446 TREE_TYPE (found) = integer_type_node;
6447 DECL_ARG_TYPE (found) = integer_type_node;
6448 layout_decl (found, 0);
6451 /* Traditionally, a parm declared float is actually a double. */
6452 if (found && flag_traditional
6453 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6455 TREE_TYPE (found) = double_type_node;
6456 DECL_ARG_TYPE (found) = double_type_node;
6457 layout_decl (found, 0);
6460 /* If no declaration found, default to int. */
6463 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6465 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6466 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6467 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6469 pedwarn_with_decl (found, "type of `%s' defaults to `int'");
6470 else if (extra_warnings)
6471 warning_with_decl (found, "type of `%s' defaults to `int'");
6475 TREE_PURPOSE (parm) = found;
6477 /* Mark this decl as "already found". */
6478 DECL_WEAK (found) = 1;
6481 /* Put anything which is on the parmdecls chain and which is
6482 not a PARM_DECL onto the list NONPARMS. (The types of
6483 non-parm things which might appear on the list include
6484 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6485 any actual PARM_DECLs not matched with any names. */
6488 for (parm = parmdecls; parm;)
6490 tree next = TREE_CHAIN (parm);
6491 TREE_CHAIN (parm) = 0;
6493 if (TREE_CODE (parm) != PARM_DECL)
6494 nonparms = chainon (nonparms, parm);
6497 /* Complain about args with incomplete types. */
6498 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6500 error_with_decl (parm, "parameter `%s' has incomplete type");
6501 TREE_TYPE (parm) = error_mark_node;
6504 if (! DECL_WEAK (parm))
6506 error_with_decl (parm,
6507 "declaration for parameter `%s' but no such parameter");
6508 /* Pretend the parameter was not missing.
6509 This gets us to a standard state and minimizes
6510 further error messages. */
6512 = chainon (specparms,
6513 tree_cons (parm, NULL_TREE, NULL_TREE));
6520 /* Chain the declarations together in the order of the list of
6521 names. Store that chain in the function decl, replacing the
6524 DECL_ARGUMENTS (fndecl) = 0;
6527 for (last = 0; parm; parm = TREE_CHAIN (parm))
6528 if (TREE_PURPOSE (parm))
6531 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6533 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6534 last = TREE_PURPOSE (parm);
6535 TREE_CHAIN (last) = 0;
6539 /* If there was a previous prototype,
6540 set the DECL_ARG_TYPE of each argument according to
6541 the type previously specified, and report any mismatches. */
6543 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6546 for (parm = DECL_ARGUMENTS (fndecl),
6547 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6548 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6549 != void_type_node));
6550 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6552 if (parm == 0 || type == 0
6553 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6555 error ("number of arguments doesn't match prototype");
6556 error_with_file_and_line (current_function_prototype_file,
6557 current_function_prototype_line,
6558 "prototype declaration");
6561 /* Type for passing arg must be consistent with that
6562 declared for the arg. ISO C says we take the unqualified
6563 type for parameters declared with qualified type. */
6564 if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6565 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
6567 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6568 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6570 /* Adjust argument to match prototype. E.g. a previous
6571 `int foo(float);' prototype causes
6572 `int foo(x) float x; {...}' to be treated like
6573 `int foo(float x) {...}'. This is particularly
6574 useful for argument types like uid_t. */
6575 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6577 if (PROMOTE_PROTOTYPES
6578 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6579 && TYPE_PRECISION (TREE_TYPE (parm))
6580 < TYPE_PRECISION (integer_type_node))
6581 DECL_ARG_TYPE (parm) = integer_type_node;
6585 pedwarn ("promoted argument `%s' doesn't match prototype",
6586 IDENTIFIER_POINTER (DECL_NAME (parm)));
6587 warning_with_file_and_line
6588 (current_function_prototype_file,
6589 current_function_prototype_line,
6590 "prototype declaration");
6593 /* If -traditional, allow `int' argument to match
6594 `unsigned' prototype. */
6595 else if (! (flag_traditional
6596 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6597 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6599 error ("argument `%s' doesn't match prototype",
6600 IDENTIFIER_POINTER (DECL_NAME (parm)));
6601 error_with_file_and_line (current_function_prototype_file,
6602 current_function_prototype_line,
6603 "prototype declaration");
6607 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6610 /* Otherwise, create a prototype that would match. */
6614 tree actual = 0, last = 0, type;
6616 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6618 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6620 TREE_CHAIN (last) = type;
6625 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6627 TREE_CHAIN (last) = type;
6631 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6632 of the type of this function, but we need to avoid having this
6633 affect the types of other similarly-typed functions, so we must
6634 first force the generation of an identical (but separate) type
6635 node for the relevant function type. The new node we create
6636 will be a variant of the main variant of the original function
6639 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6641 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6644 /* Now store the final chain of decls for the arguments
6645 as the decl-chain of the current lexical scope.
6646 Put the enumerators in as well, at the front so that
6647 DECL_ARGUMENTS is not modified. */
6649 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6652 /* Make sure the binding level for the top of the function body
6653 gets a BLOCK if there are any in the function.
6654 Otherwise, the dbx output is wrong. */
6656 keep_next_if_subblocks = 1;
6658 /* ??? This might be an improvement,
6659 but needs to be thought about some more. */
6661 keep_next_level_flag = 1;
6664 /* Write a record describing this function definition to the prototypes
6665 file (if requested). */
6667 gen_aux_info_record (fndecl, 1, 0, prototype);
6669 /* Initialize the RTL code for the function. */
6670 init_function_start (fndecl, input_filename, lineno);
6672 /* Begin the statement tree for this function. */
6673 begin_stmt_tree (&DECL_SAVED_TREE (current_function_decl));
6675 /* If this is a nested function, save away the sizes of any
6676 variable-size types so that we can expand them when generating
6682 DECL_LANG_SPECIFIC (fndecl)->pending_sizes
6683 = nreverse (get_pending_sizes ());
6684 for (t = DECL_LANG_SPECIFIC (fndecl)->pending_sizes;
6687 SAVE_EXPR_CONTEXT (TREE_VALUE (t)) = context;
6690 /* This function is being processed in whole-function mode. */
6691 cfun->x_whole_function_mode_p = 1;
6693 /* Even though we're inside a function body, we still don't want to
6694 call expand_expr to calculate the size of a variable-sized array.
6695 We haven't necessarily assigned RTL to all variables yet, so it's
6696 not safe to try to expand expressions involving them. */
6697 immediate_size_expand = 0;
6698 cfun->x_dont_save_pending_sizes_p = 1;
6701 /* Finish up a function declaration and compile that function
6702 all the way to assembler language output. The free the storage
6703 for the function definition.
6705 This is called after parsing the body of the function definition.
6707 NESTED is nonzero if the function being finished is nested in another. */
6710 finish_function (nested)
6713 tree fndecl = current_function_decl;
6715 /* TREE_READONLY (fndecl) = 1;
6716 This caused &foo to be of type ptr-to-const-function
6717 which then got a warning when stored in a ptr-to-function variable. */
6720 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6722 /* Must mark the RESULT_DECL as being in this function. */
6724 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6726 /* Obey `register' declarations if `setjmp' is called in this fn. */
6727 if (flag_traditional && current_function_calls_setjmp)
6729 setjmp_protect (DECL_INITIAL (fndecl));
6730 setjmp_protect_args ();
6733 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6735 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6736 != integer_type_node)
6738 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6739 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6741 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
6745 #ifdef DEFAULT_MAIN_RETURN
6746 /* Make it so that `main' always returns success by default. */
6747 DEFAULT_MAIN_RETURN;
6750 c_expand_return (integer_zero_node);
6755 finish_fname_decls ();
6757 /* Tie off the statement tree for this function. */
6758 finish_stmt_tree (&DECL_SAVED_TREE (fndecl));
6759 /* Clear out memory we no longer need. */
6760 free_after_parsing (cfun);
6761 /* Since we never call rest_of_compilation, we never clear
6762 CFUN. Do so explicitly. */
6763 free_after_compilation (cfun);
6768 /* Generate RTL for the body of this function. */
6769 c_expand_body (fndecl, nested);
6770 /* Let the error reporting routines know that we're outside a
6771 function. For a nested function, this value is used in
6772 pop_c_function_context and then reset via pop_function_context. */
6773 current_function_decl = NULL;
6777 /* Generate the RTL for the body of FNDECL. If NESTED_P is non-zero,
6778 then we are already in the process of generating RTL for another
6782 c_expand_body (fndecl, nested_p)
6786 int uninlinable = 1;
6788 /* There's no reason to do any of the work here if we're only doing
6789 semantic analysis; this code just generates RTL. */
6790 if (flag_syntax_only)
6793 timevar_push (TV_EXPAND);
6795 if (flag_inline_trees)
6797 /* First, cache whether the current function is inlinable. Some
6798 predicates depend on cfun and current_function_decl to
6799 function completely. */
6800 uninlinable = ! tree_inlinable_function_p (fndecl);
6802 /* Then, inline any functions called in it. */
6803 optimize_inline_calls (fndecl);
6808 /* Make sure that we will evaluate variable-sized types involved
6809 in our function's type. */
6810 expand_pending_sizes (DECL_LANG_SPECIFIC (fndecl)->pending_sizes);
6811 /* Squirrel away our current state. */
6812 push_function_context ();
6815 /* Initialize the RTL code for the function. */
6816 current_function_decl = fndecl;
6817 init_function_start (fndecl, input_filename, DECL_SOURCE_LINE (fndecl));
6819 /* This function is being processed in whole-function mode. */
6820 cfun->x_whole_function_mode_p = 1;
6822 /* Even though we're inside a function body, we still don't want to
6823 call expand_expr to calculate the size of a variable-sized array.
6824 We haven't necessarily assigned RTL to all variables yet, so it's
6825 not safe to try to expand expressions involving them. */
6826 immediate_size_expand = 0;
6827 cfun->x_dont_save_pending_sizes_p = 1;
6829 /* If this is a varargs function, inform function.c. */
6830 if (c_function_varargs)
6833 /* Set up parameters and prepare for return, for the function. */
6834 expand_function_start (fndecl, 0);
6836 /* If this function is `main', emit a call to `__main'
6837 to run global initializers, etc. */
6838 if (DECL_NAME (fndecl)
6839 && MAIN_NAME_P (DECL_NAME (fndecl))
6840 && DECL_CONTEXT (fndecl) == NULL_TREE)
6841 expand_main_function ();
6843 /* Generate the RTL for this function. */
6844 expand_stmt (DECL_SAVED_TREE (fndecl));
6847 /* Allow the body of the function to be garbage collected. */
6848 DECL_SAVED_TREE (fndecl) = NULL_TREE;
6851 /* We hard-wired immediate_size_expand to zero above.
6852 expand_function_end will decrement this variable. So, we set the
6853 variable to one here, so that after the decrement it will remain
6855 immediate_size_expand = 1;
6857 /* Allow language dialects to perform special processing. */
6858 if (lang_expand_function_end)
6859 (*lang_expand_function_end) ();
6861 /* Generate rtl for function exit. */
6862 expand_function_end (input_filename, lineno, 0);
6864 /* If this is a nested function, protect the local variables in the stack
6865 above us from being collected while we're compiling this function. */
6867 ggc_push_context ();
6869 /* Run the optimizers and output the assembler code for this function. */
6870 rest_of_compilation (fndecl);
6872 /* Undo the GC context switch. */
6876 /* With just -W, complain only if function returns both with
6877 and without a value. */
6879 && current_function_returns_value
6880 && current_function_returns_null)
6881 warning ("this function may return with or without a value");
6883 /* If requested, warn about function definitions where the function will
6884 return a value (usually of some struct or union type) which itself will
6885 take up a lot of stack space. */
6887 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6889 tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6891 if (ret_type && TYPE_SIZE_UNIT (ret_type)
6892 && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST
6893 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type),
6896 unsigned int size_as_int
6897 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type));
6899 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0)
6900 warning_with_decl (fndecl,
6901 "size of return value of `%s' is %u bytes",
6904 warning_with_decl (fndecl,
6905 "size of return value of `%s' is larger than %d bytes",
6910 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested_p
6911 && ! flag_inline_trees)
6913 /* Stop pointing to the local nodes about to be freed.
6914 But DECL_INITIAL must remain nonzero so we know this
6915 was an actual function definition.
6916 For a nested function, this is done in pop_c_function_context.
6917 If rest_of_compilation set this to 0, leave it 0. */
6918 if (DECL_INITIAL (fndecl) != 0)
6919 DECL_INITIAL (fndecl) = error_mark_node;
6921 DECL_ARGUMENTS (fndecl) = 0;
6924 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6926 if (targetm.have_ctors_dtors)
6927 (* targetm.asm_out.constructor) (XEXP (DECL_RTL (fndecl), 0),
6928 DEFAULT_INIT_PRIORITY);
6930 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6933 if (DECL_STATIC_DESTRUCTOR (fndecl))
6935 if (targetm.have_ctors_dtors)
6936 (* targetm.asm_out.destructor) (XEXP (DECL_RTL (fndecl), 0),
6937 DEFAULT_INIT_PRIORITY);
6939 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6943 /* Return to the enclosing function. */
6944 pop_function_context ();
6945 timevar_pop (TV_EXPAND);
6948 /* Check the declarations given in a for-loop for satisfying the C99
6951 check_for_loop_decls ()
6957 /* If we get here, declarations have been used in a for loop without
6958 the C99 for loop scope. This doesn't make much sense, so don't
6960 error ("`for' loop initial declaration used outside C99 mode");
6963 /* C99 subclause 6.8.5 paragraph 3:
6965 [#3] The declaration part of a for statement shall only
6966 declare identifiers for objects having storage class auto or
6969 It isn't clear whether, in this sentence, "identifiers" binds to
6970 "shall only declare" or to "objects" - that is, whether all identifiers
6971 declared must be identifiers for objects, or whether the restriction
6972 only applies to those that are. (A question on this in comp.std.c
6973 in November 2000 received no answer.) We implement the strictest
6974 interpretation, to avoid creating an extension which later causes
6977 for (t = gettags (); t; t = TREE_CHAIN (t))
6979 if (TREE_PURPOSE (t) != 0)
6981 enum tree_code code = TREE_CODE (TREE_VALUE (t));
6983 if (code == RECORD_TYPE)
6984 error ("`struct %s' declared in `for' loop initial declaration",
6985 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6986 else if (code == UNION_TYPE)
6987 error ("`union %s' declared in `for' loop initial declaration",
6988 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6990 error ("`enum %s' declared in `for' loop initial declaration",
6991 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6995 for (t = getdecls (); t; t = TREE_CHAIN (t))
6997 if (TREE_CODE (t) != VAR_DECL && DECL_NAME (t))
6998 error_with_decl (t, "declaration of non-variable `%s' in `for' loop initial declaration");
6999 else if (TREE_STATIC (t))
7000 error_with_decl (t, "declaration of static variable `%s' in `for' loop initial declaration");
7001 else if (DECL_EXTERNAL (t))
7002 error_with_decl (t, "declaration of `extern' variable `%s' in `for' loop initial declaration");
7006 /* Save and restore the variables in this file and elsewhere
7007 that keep track of the progress of compilation of the current function.
7008 Used for nested functions. */
7010 struct c_language_function
7012 struct language_function base;
7014 tree shadowed_labels;
7017 int warn_about_return_type;
7019 struct binding_level *binding_level;
7022 /* Save and reinitialize the variables
7023 used during compilation of a C function. */
7026 push_c_function_context (f)
7029 struct c_language_function *p;
7030 p = ((struct c_language_function *)
7031 xmalloc (sizeof (struct c_language_function)));
7032 f->language = (struct language_function *) p;
7034 p->base.x_stmt_tree = c_stmt_tree;
7035 p->base.x_scope_stmt_stack = c_scope_stmt_stack;
7036 p->named_labels = named_labels;
7037 p->shadowed_labels = shadowed_labels;
7038 p->returns_value = current_function_returns_value;
7039 p->returns_null = current_function_returns_null;
7040 p->warn_about_return_type = warn_about_return_type;
7041 p->extern_inline = current_extern_inline;
7042 p->binding_level = current_binding_level;
7045 /* Restore the variables used during compilation of a C function. */
7048 pop_c_function_context (f)
7051 struct c_language_function *p
7052 = (struct c_language_function *) f->language;
7055 /* Bring back all the labels that were shadowed. */
7056 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
7057 if (DECL_NAME (TREE_VALUE (link)) != 0)
7058 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
7059 = TREE_VALUE (link);
7061 if (DECL_SAVED_INSNS (current_function_decl) == 0
7062 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
7064 /* Stop pointing to the local nodes about to be freed. */
7065 /* But DECL_INITIAL must remain nonzero so we know this
7066 was an actual function definition. */
7067 DECL_INITIAL (current_function_decl) = error_mark_node;
7068 DECL_ARGUMENTS (current_function_decl) = 0;
7071 c_stmt_tree = p->base.x_stmt_tree;
7072 c_scope_stmt_stack = p->base.x_scope_stmt_stack;
7073 named_labels = p->named_labels;
7074 shadowed_labels = p->shadowed_labels;
7075 current_function_returns_value = p->returns_value;
7076 current_function_returns_null = p->returns_null;
7077 warn_about_return_type = p->warn_about_return_type;
7078 current_extern_inline = p->extern_inline;
7079 current_binding_level = p->binding_level;
7085 /* Mark the language specific parts of F for GC. */
7088 mark_c_function_context (f)
7091 struct c_language_function *p
7092 = (struct c_language_function *) f->language;
7097 mark_c_language_function (&p->base);
7098 ggc_mark_tree (p->shadowed_labels);
7099 ggc_mark_tree (p->named_labels);
7100 mark_binding_level (&p->binding_level);
7103 /* Copy the DECL_LANG_SPECIFIC data associated with NODE. */
7106 copy_lang_decl (decl)
7109 struct lang_decl *ld;
7111 if (!DECL_LANG_SPECIFIC (decl))
7114 ld = (struct lang_decl *) ggc_alloc (sizeof (struct lang_decl));
7115 memcpy ((char *) ld, (char *) DECL_LANG_SPECIFIC (decl),
7116 sizeof (struct lang_decl));
7117 DECL_LANG_SPECIFIC (decl) = ld;
7120 /* Mark the language specific bits in T for GC. */
7126 if (TREE_CODE (t) == IDENTIFIER_NODE)
7128 struct lang_identifier *i = (struct lang_identifier *) t;
7129 ggc_mark_tree (i->global_value);
7130 ggc_mark_tree (i->local_value);
7131 ggc_mark_tree (i->label_value);
7132 ggc_mark_tree (i->implicit_decl);
7133 ggc_mark_tree (i->error_locus);
7134 ggc_mark_tree (i->limbo_value);
7136 else if (TYPE_P (t) && TYPE_LANG_SPECIFIC (t))
7137 ggc_mark (TYPE_LANG_SPECIFIC (t));
7138 else if (DECL_P (t) && DECL_LANG_SPECIFIC (t))
7140 ggc_mark (DECL_LANG_SPECIFIC (t));
7141 c_mark_lang_decl (&DECL_LANG_SPECIFIC (t)->base);
7142 ggc_mark_tree (DECL_LANG_SPECIFIC (t)->pending_sizes);
7146 /* The functions below are required for functionality of doing
7147 function at once processing in the C front end. Currently these
7148 functions are not called from anywhere in the C front end, but as
7149 these changes continue, that will change. */
7151 /* Returns non-zero if the current statement is a full expression,
7152 i.e. temporaries created during that statement should be destroyed
7153 at the end of the statement. */
7156 stmts_are_full_exprs_p ()
7161 /* Returns the stmt_tree (if any) to which statements are currently
7162 being added. If there is no active statement-tree, NULL is
7166 current_stmt_tree ()
7168 return &c_stmt_tree;
7171 /* Returns the stack of SCOPE_STMTs for the current function. */
7174 current_scope_stmt_stack ()
7176 return &c_scope_stmt_stack;
7179 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
7183 anon_aggr_type_p (node)
7184 tree node ATTRIBUTE_UNUSED;
7189 /* Dummy function in place of callback used by C++. */
7192 extract_interface_info ()
7196 /* Return a new COMPOUND_STMT, after adding it to the current
7200 c_begin_compound_stmt ()
7204 /* Create the COMPOUND_STMT. */
7205 stmt = add_stmt (build_stmt (COMPOUND_STMT, NULL_TREE));
7210 /* Expand T (a DECL_STMT) if it declares an entity not handled by the
7214 c_expand_decl_stmt (t)
7217 tree decl = DECL_STMT_DECL (t);
7219 /* Expand nested functions. */
7220 if (TREE_CODE (decl) == FUNCTION_DECL
7221 && DECL_CONTEXT (decl) == current_function_decl
7222 && DECL_SAVED_TREE (decl))
7223 c_expand_body (decl, /*nested_p=*/1);
7226 /* Return the IDENTIFIER_GLOBAL_VALUE of T, for use in common code, since
7227 the definition of IDENTIFIER_GLOBAL_VALUE is different for C and C++. */
7230 identifier_global_value (t)
7233 return IDENTIFIER_GLOBAL_VALUE (t);
7236 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
7237 otherwise the name is found in ridpointers from RID_INDEX. */
7240 record_builtin_type (rid_index, name, type)
7247 id = ridpointers[(int) rid_index];
7249 id = get_identifier (name);
7250 pushdecl (build_decl (TYPE_DECL, id, type));
7253 /* Build the void_list_node (void_type_node having been created). */
7255 build_void_list_node ()
7257 tree t = build_tree_list (NULL_TREE, void_type_node);