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, "-Wunknown-pragmas"))
754 /* Set to greater than 1, so that even unknown pragmas in system
755 headers will be warned about. */
756 warn_unknown_pragmas = 2;
757 else if (!strcmp (p, "-Wno-unknown-pragmas"))
758 warn_unknown_pragmas = 0;
759 else if (!strcmp (p, "-Wall"))
761 /* We save the value of warn_uninitialized, since if they put
762 -Wuninitialized on the command line, we need to generate a
763 warning about not using it without also specifying -O. */
764 if (warn_uninitialized != 1)
765 warn_uninitialized = 2;
766 warn_implicit_int = 1;
767 mesg_implicit_function_declaration = 1;
768 warn_return_type = 1;
772 warn_char_subscripts = 1;
773 warn_parentheses = 1;
774 warn_sequence_point = 1;
775 warn_missing_braces = 1;
776 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
777 it off only if it's not explicit. */
779 /* Only warn about unknown pragmas that are not in system headers. */
780 warn_unknown_pragmas = 1;
783 return strings_processed;
788 /* Hooks for print_node. */
791 print_lang_decl (file, node, indent)
792 FILE *file ATTRIBUTE_UNUSED;
793 tree node ATTRIBUTE_UNUSED;
794 int indent ATTRIBUTE_UNUSED;
799 print_lang_type (file, node, indent)
800 FILE *file ATTRIBUTE_UNUSED;
801 tree node ATTRIBUTE_UNUSED;
802 int indent ATTRIBUTE_UNUSED;
807 print_lang_identifier (file, node, indent)
812 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
813 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
814 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
815 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
816 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
817 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
818 if (C_IS_RESERVED_WORD (node))
820 tree rid = ridpointers[C_RID_CODE (node)];
821 indent_to (file, indent + 4);
822 fprintf (file, "rid ");
823 fprintf (file, HOST_PTR_PRINTF, (void *)rid);
824 fprintf (file, " \"%s\"", IDENTIFIER_POINTER (rid));
828 /* Hook called at end of compilation to assume 1 elt
829 for a top-level tentative array defn that wasn't complete before. */
832 finish_incomplete_decl (decl)
835 if (TREE_CODE (decl) == VAR_DECL)
837 tree type = TREE_TYPE (decl);
838 if (type != error_mark_node
839 && TREE_CODE (type) == ARRAY_TYPE
840 && ! DECL_EXTERNAL (decl)
841 && TYPE_DOMAIN (type) == 0)
843 warning_with_decl (decl, "array `%s' assumed to have one element");
845 complete_array_type (type, NULL_TREE, 1);
847 layout_decl (decl, 0);
852 /* Create a new `struct binding_level'. */
854 static struct binding_level *
855 make_binding_level ()
858 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
861 /* Nonzero if we are currently in the global binding level. */
866 return current_binding_level == global_binding_level;
872 keep_next_level_flag = 1;
875 /* Nonzero if the current level needs to have a BLOCK made. */
880 return ((current_binding_level->keep_if_subblocks
881 && current_binding_level->blocks != 0)
882 || current_binding_level->keep
883 || current_binding_level->names != 0
884 || (current_binding_level->tags != 0
885 && !current_binding_level->tag_transparent));
888 /* Identify this binding level as a level of parameters.
889 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
890 But it turns out there is no way to pass the right value for
891 DEFINITION_FLAG, so we ignore it. */
894 declare_parm_level (definition_flag)
895 int definition_flag ATTRIBUTE_UNUSED;
897 current_binding_level->parm_flag = 1;
900 /* Nonzero if currently making parm declarations. */
905 return current_binding_level->parm_flag;
908 /* Enter a new binding level.
909 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
910 not for that of tags. */
913 pushlevel (tag_transparent)
916 struct binding_level *newlevel = NULL_BINDING_LEVEL;
918 /* If this is the top level of a function,
919 just make sure that NAMED_LABELS is 0. */
921 if (current_binding_level == global_binding_level)
926 /* Reuse or create a struct for this binding level. */
928 if (free_binding_level)
930 newlevel = free_binding_level;
931 free_binding_level = free_binding_level->level_chain;
935 newlevel = make_binding_level ();
938 /* Add this level to the front of the chain (stack) of levels that
941 *newlevel = clear_binding_level;
942 newlevel->tag_transparent
944 || (current_binding_level
945 ? current_binding_level->subblocks_tag_transparent
947 newlevel->level_chain = current_binding_level;
948 current_binding_level = newlevel;
949 newlevel->keep = keep_next_level_flag;
950 keep_next_level_flag = 0;
951 newlevel->keep_if_subblocks = keep_next_if_subblocks;
952 keep_next_if_subblocks = 0;
955 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
958 clear_limbo_values (block)
963 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
964 if (DECL_NAME (tem) != 0)
965 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
967 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
968 clear_limbo_values (tem);
971 /* Exit a binding level.
972 Pop the level off, and restore the state of the identifier-decl mappings
973 that were in effect when this level was entered.
975 If KEEP is nonzero, this level had explicit declarations, so
976 and create a "block" (a BLOCK node) for the level
977 to record its declarations and subblocks for symbol table output.
979 If FUNCTIONBODY is nonzero, this level is the body of a function,
980 so create a block as if KEEP were set and also clear out all
983 If REVERSE is nonzero, reverse the order of decls before putting
984 them into the BLOCK. */
987 poplevel (keep, reverse, functionbody)
993 /* The chain of decls was accumulated in reverse order.
994 Put it into forward order, just for cleanliness. */
996 tree tags = current_binding_level->tags;
997 tree subblocks = current_binding_level->blocks;
1000 int block_previously_created;
1002 keep |= current_binding_level->keep;
1004 /* This warning is turned off because it causes warnings for
1005 declarations like `extern struct foo *x'. */
1007 /* Warn about incomplete structure types in this level. */
1008 for (link = tags; link; link = TREE_CHAIN (link))
1009 if (!COMPLETE_TYPE_P (TREE_VALUE (link)))
1011 tree type = TREE_VALUE (link);
1012 tree type_name = TYPE_NAME (type);
1013 char *id = IDENTIFIER_POINTER (TREE_CODE (type_name) == IDENTIFIER_NODE
1015 : DECL_NAME (type_name));
1016 switch (TREE_CODE (type))
1019 error ("`struct %s' incomplete in scope ending here", id);
1022 error ("`union %s' incomplete in scope ending here", id);
1025 error ("`enum %s' incomplete in scope ending here", id);
1031 /* Get the decls in the order they were written.
1032 Usually current_binding_level->names is in reverse order.
1033 But parameter decls were previously put in forward order. */
1036 current_binding_level->names
1037 = decls = nreverse (current_binding_level->names);
1039 decls = current_binding_level->names;
1041 /* Output any nested inline functions within this block
1042 if they weren't already output. */
1044 for (decl = decls; decl; decl = TREE_CHAIN (decl))
1045 if (TREE_CODE (decl) == FUNCTION_DECL
1046 && ! TREE_ASM_WRITTEN (decl)
1047 && DECL_INITIAL (decl) != 0
1048 && TREE_ADDRESSABLE (decl))
1050 /* If this decl was copied from a file-scope decl
1051 on account of a block-scope extern decl,
1052 propagate TREE_ADDRESSABLE to the file-scope decl.
1054 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1055 true, since then the decl goes through save_for_inline_copying. */
1056 if (DECL_ABSTRACT_ORIGIN (decl) != 0
1057 && DECL_ABSTRACT_ORIGIN (decl) != decl)
1058 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
1061 /* We used to warn about unused variables in expand_end_bindings,
1062 i.e. while generating RTL. But in function-at-a-time mode we may
1063 choose to never expand a function at all (e.g. auto inlining), so
1064 we do this explicitly now. */
1065 warn_about_unused_variables (getdecls ());
1067 /* If there were any declarations or structure tags in that level,
1068 or if this level is a function body,
1069 create a BLOCK to record them for the life of this function. */
1072 block_previously_created = (current_binding_level->this_block != 0);
1073 if (block_previously_created)
1074 block = current_binding_level->this_block;
1075 else if (keep || functionbody
1076 || (current_binding_level->keep_if_subblocks && subblocks != 0))
1077 block = make_node (BLOCK);
1080 BLOCK_VARS (block) = decls;
1081 BLOCK_SUBBLOCKS (block) = subblocks;
1084 /* In each subblock, record that this is its superior. */
1086 for (link = subblocks; link; link = TREE_CHAIN (link))
1087 BLOCK_SUPERCONTEXT (link) = block;
1089 /* Clear out the meanings of the local variables of this level. */
1091 for (link = decls; link; link = TREE_CHAIN (link))
1093 if (DECL_NAME (link) != 0)
1095 /* If the ident. was used or addressed via a local extern decl,
1096 don't forget that fact. */
1097 if (DECL_EXTERNAL (link))
1099 if (TREE_USED (link))
1100 TREE_USED (DECL_NAME (link)) = 1;
1101 if (TREE_ADDRESSABLE (link))
1102 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1104 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1108 /* Restore all name-meanings of the outer levels
1109 that were shadowed by this level. */
1111 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1112 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1114 /* If the level being exited is the top level of a function,
1115 check over all the labels, and clear out the current
1116 (function local) meanings of their names. */
1120 clear_limbo_values (block);
1122 /* If this is the top level block of a function,
1123 the vars are the function's parameters.
1124 Don't leave them in the BLOCK because they are
1125 found in the FUNCTION_DECL instead. */
1127 BLOCK_VARS (block) = 0;
1129 /* Clear out the definitions of all label names,
1130 since their scopes end here,
1131 and add them to BLOCK_VARS. */
1133 for (link = named_labels; link; link = TREE_CHAIN (link))
1135 tree label = TREE_VALUE (link);
1137 if (DECL_INITIAL (label) == 0)
1139 error_with_decl (label, "label `%s' used but not defined");
1140 /* Avoid crashing later. */
1141 define_label (input_filename, lineno,
1144 else if (warn_unused_label && !TREE_USED (label))
1145 warning_with_decl (label, "label `%s' defined but not used");
1146 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1148 /* Put the labels into the "variables" of the
1149 top-level block, so debugger can see them. */
1150 TREE_CHAIN (label) = BLOCK_VARS (block);
1151 BLOCK_VARS (block) = label;
1155 /* Pop the current level, and free the structure for reuse. */
1158 struct binding_level *level = current_binding_level;
1159 current_binding_level = current_binding_level->level_chain;
1161 level->level_chain = free_binding_level;
1162 free_binding_level = level;
1165 /* Dispose of the block that we just made inside some higher level. */
1167 DECL_INITIAL (current_function_decl) = block;
1170 if (!block_previously_created)
1171 current_binding_level->blocks
1172 = chainon (current_binding_level->blocks, block);
1174 /* If we did not make a block for the level just exited,
1175 any blocks made for inner levels
1176 (since they cannot be recorded as subblocks in that level)
1177 must be carried forward so they will later become subblocks
1178 of something else. */
1180 current_binding_level->blocks
1181 = chainon (current_binding_level->blocks, subblocks);
1183 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1184 binding contour so that they point to the appropriate construct, i.e.
1185 either to the current FUNCTION_DECL node, or else to the BLOCK node
1186 we just constructed.
1188 Note that for tagged types whose scope is just the formal parameter
1189 list for some function type specification, we can't properly set
1190 their TYPE_CONTEXTs here, because we don't have a pointer to the
1191 appropriate FUNCTION_TYPE node readily available to us. For those
1192 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1193 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1194 node which will represent the "scope" for these "parameter list local"
1198 for (link = tags; link; link = TREE_CHAIN (link))
1199 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1201 for (link = tags; link; link = TREE_CHAIN (link))
1202 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1205 TREE_USED (block) = 1;
1210 /* Delete the node BLOCK from the current binding level.
1211 This is used for the block inside a stmt expr ({...})
1212 so that the block can be reinserted where appropriate. */
1215 delete_block (block)
1219 if (current_binding_level->blocks == block)
1220 current_binding_level->blocks = TREE_CHAIN (block);
1221 for (t = current_binding_level->blocks; t;)
1223 if (TREE_CHAIN (t) == block)
1224 TREE_CHAIN (t) = TREE_CHAIN (block);
1228 TREE_CHAIN (block) = NULL;
1229 /* Clear TREE_USED which is always set by poplevel.
1230 The flag is set again if insert_block is called. */
1231 TREE_USED (block) = 0;
1234 /* Insert BLOCK at the end of the list of subblocks of the
1235 current binding level. This is used when a BIND_EXPR is expanded,
1236 to handle the BLOCK node inside the BIND_EXPR. */
1239 insert_block (block)
1242 TREE_USED (block) = 1;
1243 current_binding_level->blocks
1244 = chainon (current_binding_level->blocks, block);
1247 /* Set the BLOCK node for the innermost scope
1248 (the one we are currently in). */
1254 current_binding_level->this_block = block;
1255 current_binding_level->names = chainon (current_binding_level->names,
1256 BLOCK_VARS (block));
1257 current_binding_level->blocks = chainon (current_binding_level->blocks,
1258 BLOCK_SUBBLOCKS (block));
1264 struct binding_level *newlevel;
1266 /* Reuse or create a struct for this binding level. */
1268 if (free_binding_level)
1270 newlevel = free_binding_level;
1271 free_binding_level = free_binding_level->level_chain;
1275 newlevel = make_binding_level ();
1278 /* Add this level to the front of the chain (stack) of label levels. */
1280 newlevel->level_chain = label_level_chain;
1281 label_level_chain = newlevel;
1283 newlevel->names = named_labels;
1284 newlevel->shadowed = shadowed_labels;
1286 shadowed_labels = 0;
1292 struct binding_level *level = label_level_chain;
1295 /* Clear out the definitions of the declared labels in this level.
1296 Leave in the list any ordinary, non-declared labels. */
1297 for (link = named_labels, prev = 0; link;)
1299 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1301 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1303 error_with_decl (TREE_VALUE (link),
1304 "label `%s' used but not defined");
1305 /* Avoid crashing later. */
1306 define_label (input_filename, lineno,
1307 DECL_NAME (TREE_VALUE (link)));
1309 else if (warn_unused_label && !TREE_USED (TREE_VALUE (link)))
1310 warning_with_decl (TREE_VALUE (link),
1311 "label `%s' defined but not used");
1312 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1314 /* Delete this element from the list. */
1315 link = TREE_CHAIN (link);
1317 TREE_CHAIN (prev) = link;
1319 named_labels = link;
1324 link = TREE_CHAIN (link);
1328 /* Bring back all the labels that were shadowed. */
1329 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1330 if (DECL_NAME (TREE_VALUE (link)) != 0)
1331 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1332 = TREE_VALUE (link);
1334 named_labels = chainon (named_labels, level->names);
1335 shadowed_labels = level->shadowed;
1337 /* Pop the current level, and free the structure for reuse. */
1338 label_level_chain = label_level_chain->level_chain;
1339 level->level_chain = free_binding_level;
1340 free_binding_level = level;
1343 /* Push a definition or a declaration of struct, union or enum tag "name".
1344 "type" should be the type node.
1345 We assume that the tag "name" is not already defined.
1347 Note that the definition may really be just a forward reference.
1348 In that case, the TYPE_SIZE will be zero. */
1351 pushtag (name, type)
1354 struct binding_level *b;
1356 /* Find the proper binding level for this type tag. */
1358 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1363 /* Record the identifier as the type's name if it has none. */
1365 if (TYPE_NAME (type) == 0)
1366 TYPE_NAME (type) = name;
1369 b->tags = tree_cons (name, type, b->tags);
1371 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1372 tagged type we just added to the current binding level. This fake
1373 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1374 to output a representation of a tagged type, and it also gives
1375 us a convenient place to record the "scope start" address for the
1378 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1380 /* An approximation for now, so we can tell this is a function-scope tag.
1381 This will be updated in poplevel. */
1382 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1385 /* Handle when a new declaration NEWDECL
1386 has the same name as an old one OLDDECL
1387 in the same binding contour.
1388 Prints an error message if appropriate.
1390 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1391 Otherwise, return 0.
1393 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1394 and OLDDECL is in an outer binding level and should thus not be changed. */
1397 duplicate_decls (newdecl, olddecl, different_binding_level)
1398 tree newdecl, olddecl;
1399 int different_binding_level;
1401 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1402 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1403 && DECL_INITIAL (newdecl) != 0);
1404 tree oldtype = TREE_TYPE (olddecl);
1405 tree newtype = TREE_TYPE (newdecl);
1408 if (DECL_P (olddecl))
1410 if (TREE_CODE (newdecl) == FUNCTION_DECL
1411 && TREE_CODE (olddecl) == FUNCTION_DECL
1412 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1414 if (DECL_DECLARED_INLINE_P (newdecl)
1415 && DECL_UNINLINABLE (newdecl)
1416 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1417 /* Already warned elsewhere. */;
1418 else if (DECL_DECLARED_INLINE_P (olddecl)
1419 && DECL_UNINLINABLE (olddecl)
1420 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1421 /* Already warned. */;
1422 else if (DECL_DECLARED_INLINE_P (newdecl)
1423 && ! DECL_DECLARED_INLINE_P (olddecl)
1424 && DECL_UNINLINABLE (olddecl)
1425 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1427 warning_with_decl (newdecl,
1428 "function `%s' redeclared as inline");
1429 warning_with_decl (olddecl,
1430 "previous declaration of function `%s' with attribute noinline");
1432 else if (DECL_DECLARED_INLINE_P (olddecl)
1433 && DECL_UNINLINABLE (newdecl)
1434 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1436 warning_with_decl (newdecl,
1437 "function `%s' redeclared with attribute noinline");
1438 warning_with_decl (olddecl,
1439 "previous declaration of function `%s' was inline");
1443 DECL_ATTRIBUTES (newdecl)
1444 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1447 if (TREE_CODE (newtype) == ERROR_MARK
1448 || TREE_CODE (oldtype) == ERROR_MARK)
1451 /* New decl is completely inconsistent with the old one =>
1452 tell caller to replace the old one.
1453 This is always an error except in the case of shadowing a builtin. */
1454 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1456 if (TREE_CODE (olddecl) == FUNCTION_DECL
1457 && (DECL_BUILT_IN (olddecl)
1458 || DECL_BUILT_IN_NONANSI (olddecl)))
1460 /* If you declare a built-in or predefined function name as static,
1461 the old definition is overridden,
1462 but optionally warn this was a bad choice of name. */
1463 if (!TREE_PUBLIC (newdecl))
1467 else if (DECL_BUILT_IN (olddecl))
1468 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1470 warning_with_decl (newdecl, "shadowing library function `%s'");
1472 /* Likewise, if the built-in is not ansi, then programs can
1473 override it even globally without an error. */
1474 else if (! DECL_BUILT_IN (olddecl))
1475 warning_with_decl (newdecl,
1476 "library function `%s' declared as non-function");
1478 else if (DECL_BUILT_IN_NONANSI (olddecl))
1479 warning_with_decl (newdecl,
1480 "built-in function `%s' declared as non-function");
1482 warning_with_decl (newdecl,
1483 "built-in function `%s' declared as non-function");
1487 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1488 error_with_decl (olddecl, "previous declaration of `%s'");
1494 /* For real parm decl following a forward decl,
1495 return 1 so old decl will be reused. */
1496 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1497 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1500 /* The new declaration is the same kind of object as the old one.
1501 The declarations may partially match. Print warnings if they don't
1502 match enough. Ultimately, copy most of the information from the new
1503 decl to the old one, and keep using the old one. */
1505 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1506 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1507 && DECL_INITIAL (olddecl) == 0)
1508 /* If -traditional, avoid error for redeclaring fcn
1509 after implicit decl. */
1511 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1512 && DECL_BUILT_IN (olddecl))
1514 /* A function declaration for a built-in function. */
1515 if (!TREE_PUBLIC (newdecl))
1517 /* If you declare a built-in function name as static, the
1518 built-in definition is overridden,
1519 but optionally warn this was a bad choice of name. */
1521 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1522 /* Discard the old built-in function. */
1525 else if (!types_match)
1527 /* Accept the return type of the new declaration if same modes. */
1528 tree oldreturntype = TREE_TYPE (oldtype);
1529 tree newreturntype = TREE_TYPE (newtype);
1531 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1533 /* Function types may be shared, so we can't just modify
1534 the return type of olddecl's function type. */
1536 = build_function_type (newreturntype,
1537 TYPE_ARG_TYPES (oldtype));
1538 trytype = build_type_attribute_variant (trytype,
1539 TYPE_ATTRIBUTES (oldtype));
1541 types_match = comptypes (newtype, trytype);
1545 /* Accept harmless mismatch in first argument type also.
1546 This is for the ffs and fprintf builtins. */
1547 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1548 && TYPE_ARG_TYPES (oldtype) != 0
1549 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1550 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1551 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1552 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1554 /* Function types may be shared, so we can't just modify
1555 the return type of olddecl's function type. */
1557 = build_function_type (TREE_TYPE (oldtype),
1558 tree_cons (NULL_TREE,
1559 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1560 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1561 trytype = build_type_attribute_variant (trytype,
1562 TYPE_ATTRIBUTES (oldtype));
1564 types_match = comptypes (newtype, trytype);
1568 if (! different_binding_level)
1569 TREE_TYPE (olddecl) = oldtype;
1573 /* If types don't match for a built-in, throw away the built-in. */
1574 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1578 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1579 && DECL_SOURCE_LINE (olddecl) == 0)
1581 /* A function declaration for a predeclared function
1582 that isn't actually built in. */
1583 if (!TREE_PUBLIC (newdecl))
1585 /* If you declare it as static, the
1586 default definition is overridden. */
1589 else if (!types_match)
1591 /* If the types don't match, preserve volatility indication.
1592 Later on, we will discard everything else about the
1593 default declaration. */
1594 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1597 /* Permit char *foo () to match void *foo (...) if not pedantic,
1598 if one of them came from a system header file. */
1599 else if (!types_match
1600 && TREE_CODE (olddecl) == FUNCTION_DECL
1601 && TREE_CODE (newdecl) == FUNCTION_DECL
1602 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1603 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1604 && (DECL_IN_SYSTEM_HEADER (olddecl)
1605 || DECL_IN_SYSTEM_HEADER (newdecl))
1606 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1607 && TYPE_ARG_TYPES (oldtype) == 0
1608 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1609 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1611 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1612 && TYPE_ARG_TYPES (newtype) == 0
1613 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1614 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1617 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1618 /* Make sure we keep void * as ret type, not char *. */
1619 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1620 TREE_TYPE (newdecl) = newtype = oldtype;
1622 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1623 we will come back here again. */
1624 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1626 else if (!types_match
1627 /* Permit char *foo (int, ...); followed by char *foo ();
1629 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1631 /* Return types must still match. */
1632 && comptypes (TREE_TYPE (oldtype),
1633 TREE_TYPE (newtype))
1634 && TYPE_ARG_TYPES (newtype) == 0))
1636 error_with_decl (newdecl, "conflicting types for `%s'");
1637 /* Check for function type mismatch
1638 involving an empty arglist vs a nonempty one. */
1639 if (TREE_CODE (olddecl) == FUNCTION_DECL
1640 && comptypes (TREE_TYPE (oldtype),
1641 TREE_TYPE (newtype))
1642 && ((TYPE_ARG_TYPES (oldtype) == 0
1643 && DECL_INITIAL (olddecl) == 0)
1645 (TYPE_ARG_TYPES (newtype) == 0
1646 && DECL_INITIAL (newdecl) == 0)))
1648 /* Classify the problem further. */
1649 tree t = TYPE_ARG_TYPES (oldtype);
1651 t = TYPE_ARG_TYPES (newtype);
1652 for (; t; t = TREE_CHAIN (t))
1654 tree type = TREE_VALUE (t);
1656 if (TREE_CHAIN (t) == 0
1657 && TYPE_MAIN_VARIANT (type) != void_type_node)
1659 error ("A parameter list with an ellipsis can't match an empty parameter name list declaration.");
1663 if (simple_type_promotes_to (type) != NULL_TREE)
1665 error ("An argument type that has a default promotion can't match an empty parameter name list declaration.");
1670 error_with_decl (olddecl, "previous declaration of `%s'");
1674 errmsg = redeclaration_error_message (newdecl, olddecl);
1680 error_with_decl (newdecl, "redefinition of `%s'");
1683 error_with_decl (newdecl, "redeclaration of `%s'");
1686 error_with_decl (newdecl, "conflicting declarations of `%s'");
1692 error_with_decl (olddecl,
1693 ((DECL_INITIAL (olddecl)
1694 && current_binding_level == global_binding_level)
1695 ? "`%s' previously defined here"
1696 : "`%s' previously declared here"));
1698 else if (TREE_CODE (newdecl) == TYPE_DECL
1699 && (DECL_IN_SYSTEM_HEADER (olddecl)
1700 || DECL_IN_SYSTEM_HEADER (newdecl)))
1702 warning_with_decl (newdecl, "redefinition of `%s'");
1705 ((DECL_INITIAL (olddecl)
1706 && current_binding_level == global_binding_level)
1707 ? "`%s' previously defined here"
1708 : "`%s' previously declared here"));
1710 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1711 && DECL_INITIAL (olddecl) != 0
1712 && TYPE_ARG_TYPES (oldtype) == 0
1713 && TYPE_ARG_TYPES (newtype) != 0
1714 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1718 /* Prototype decl follows defn w/o prototype. */
1720 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1721 type = TYPE_ARG_TYPES (newtype),
1724 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1726 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1727 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1729 warning_with_decl (newdecl, "prototype for `%s' follows");
1730 warning_with_decl (olddecl, "non-prototype definition here");
1733 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1734 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1736 error_with_decl (newdecl,
1737 "prototype for `%s' follows and number of arguments doesn't match");
1738 error_with_decl (olddecl, "non-prototype definition here");
1742 /* Type for passing arg must be consistent
1743 with that declared for the arg. */
1744 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1745 /* If -traditional, allow `unsigned int' instead of `int'
1746 in the prototype. */
1747 && (! (flag_traditional
1748 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1749 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1751 error_with_decl (newdecl,
1752 "prototype for `%s' follows and argument %d doesn't match",
1754 error_with_decl (olddecl, "non-prototype definition here");
1760 /* Warn about mismatches in various flags. */
1763 /* Warn if function is now inline
1764 but was previously declared not inline and has been called. */
1765 if (TREE_CODE (olddecl) == FUNCTION_DECL
1766 && ! DECL_DECLARED_INLINE_P (olddecl)
1767 && DECL_DECLARED_INLINE_P (newdecl)
1768 && TREE_USED (olddecl))
1769 warning_with_decl (newdecl,
1770 "`%s' declared inline after being called");
1771 if (TREE_CODE (olddecl) == FUNCTION_DECL
1772 && ! DECL_DECLARED_INLINE_P (olddecl)
1773 && DECL_DECLARED_INLINE_P (newdecl)
1774 && DECL_INITIAL (olddecl) != 0)
1775 warning_with_decl (newdecl,
1776 "`%s' declared inline after its definition");
1778 /* If pedantic, warn when static declaration follows a non-static
1779 declaration. Otherwise, do so only for functions. */
1780 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1781 && TREE_PUBLIC (olddecl)
1782 && !TREE_PUBLIC (newdecl))
1783 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1785 /* If warn_traditional, warn when a non-static function
1786 declaration follows a static one. */
1787 if (warn_traditional && !in_system_header
1788 && TREE_CODE (olddecl) == FUNCTION_DECL
1789 && !TREE_PUBLIC (olddecl)
1790 && TREE_PUBLIC (newdecl))
1791 warning_with_decl (newdecl, "non-static declaration for `%s' follows static");
1793 /* Warn when const declaration follows a non-const
1794 declaration, but not for functions. */
1795 if (TREE_CODE (olddecl) != FUNCTION_DECL
1796 && !TREE_READONLY (olddecl)
1797 && TREE_READONLY (newdecl))
1798 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1799 /* These bits are logically part of the type, for variables.
1800 But not for functions
1801 (where qualifiers are not valid ANSI anyway). */
1802 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1803 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1804 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1805 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1809 /* Optionally warn about more than one declaration for the same name. */
1810 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1811 /* Don't warn about a function declaration
1812 followed by a definition. */
1813 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1814 && DECL_INITIAL (olddecl) == 0)
1815 /* Don't warn about extern decl followed by (tentative) definition. */
1816 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1818 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1819 warning_with_decl (olddecl, "previous declaration of `%s'");
1822 /* Copy all the DECL_... slots specified in the new decl
1823 except for any that we copy here from the old type.
1825 Past this point, we don't change OLDTYPE and NEWTYPE
1826 even if we change the types of NEWDECL and OLDDECL. */
1830 /* When copying info to olddecl, we store into write_olddecl
1831 instead. This allows us to avoid modifying olddecl when
1832 different_binding_level is true. */
1833 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1835 /* Merge the data types specified in the two decls. */
1836 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1838 if (different_binding_level)
1840 if (TYPE_ARG_TYPES (oldtype) != 0
1841 && TYPE_ARG_TYPES (newtype) == 0)
1842 TREE_TYPE (newdecl) = common_type (newtype, oldtype);
1845 = build_type_attribute_variant
1847 merge_attributes (TYPE_ATTRIBUTES (newtype),
1848 TYPE_ATTRIBUTES (oldtype)));
1852 = TREE_TYPE (olddecl)
1853 = common_type (newtype, oldtype);
1856 /* Lay the type out, unless already done. */
1857 if (oldtype != TREE_TYPE (newdecl))
1859 if (TREE_TYPE (newdecl) != error_mark_node)
1860 layout_type (TREE_TYPE (newdecl));
1861 if (TREE_CODE (newdecl) != FUNCTION_DECL
1862 && TREE_CODE (newdecl) != TYPE_DECL
1863 && TREE_CODE (newdecl) != CONST_DECL)
1864 layout_decl (newdecl, 0);
1868 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1869 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1870 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1871 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1872 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1873 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1875 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1876 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1880 /* Keep the old rtl since we can safely use it. */
1881 COPY_DECL_RTL (olddecl, newdecl);
1883 /* Merge the type qualifiers. */
1884 if (TREE_CODE (olddecl) == FUNCTION_DECL
1885 && DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1886 && ! TREE_THIS_VOLATILE (newdecl))
1887 TREE_THIS_VOLATILE (write_olddecl) = 0;
1889 if (TREE_READONLY (newdecl))
1890 TREE_READONLY (write_olddecl) = 1;
1892 if (TREE_THIS_VOLATILE (newdecl))
1894 TREE_THIS_VOLATILE (write_olddecl) = 1;
1895 if (TREE_CODE (newdecl) == VAR_DECL
1896 /* If an automatic variable is re-declared in the same
1897 function scope, but the old declaration was not
1898 volatile, make_var_volatile() would crash because the
1899 variable would have been assigned to a pseudo, not a
1900 MEM. Since this duplicate declaration is invalid
1901 anyway, we just skip the call. */
1903 make_var_volatile (newdecl);
1906 /* Keep source location of definition rather than declaration. */
1907 /* When called with different_binding_level set, keep the old
1908 information so that meaningful diagnostics can be given. */
1909 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1910 && ! different_binding_level)
1912 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1913 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1916 /* Merge the unused-warning information. */
1917 if (DECL_IN_SYSTEM_HEADER (olddecl))
1918 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1919 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1920 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1922 /* Merge the initialization information. */
1923 /* When called with different_binding_level set, don't copy over
1924 DECL_INITIAL, so that we don't accidentally change function
1925 declarations into function definitions. */
1926 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1927 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1929 /* Merge the section attribute.
1930 We want to issue an error if the sections conflict but that must be
1931 done later in decl_attributes since we are called before attributes
1933 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1934 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1936 /* Copy the assembler name.
1937 Currently, it can only be defined in the prototype. */
1938 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1940 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1942 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1943 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1945 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1946 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1947 DECL_NO_CHECK_MEMORY_USAGE (newdecl)
1948 |= DECL_NO_CHECK_MEMORY_USAGE (olddecl);
1949 DECL_NO_LIMIT_STACK (newdecl)
1950 |= DECL_NO_LIMIT_STACK (olddecl);
1953 /* If cannot merge, then use the new type and qualifiers,
1954 and don't preserve the old rtl. */
1955 else if (! different_binding_level)
1957 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1958 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1959 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1960 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1963 /* Merge the storage class information. */
1964 DECL_WEAK (newdecl) |= DECL_WEAK (olddecl);
1965 /* For functions, static overrides non-static. */
1966 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1968 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1969 /* This is since we don't automatically
1970 copy the attributes of NEWDECL into OLDDECL. */
1971 /* No need to worry about different_binding_level here because
1972 then TREE_PUBLIC (newdecl) was true. */
1973 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1974 /* If this clears `static', clear it in the identifier too. */
1975 if (! TREE_PUBLIC (olddecl))
1976 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1978 if (DECL_EXTERNAL (newdecl))
1980 if (! different_binding_level)
1982 /* Don't mess with these flags on local externs; they remain
1983 external even if there's a declaration at file scope which
1985 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1986 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1988 /* An extern decl does not override previous storage class. */
1989 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1990 if (! DECL_EXTERNAL (newdecl))
1991 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1995 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1996 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1999 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2001 /* If we're redefining a function previously defined as extern
2002 inline, make sure we emit debug info for the inline before we
2003 throw it away, in case it was inlined into a function that hasn't
2004 been written out yet. */
2005 if (new_is_definition && DECL_INITIAL (olddecl) && TREE_USED (olddecl))
2007 (*debug_hooks->outlining_inline_function) (olddecl);
2009 /* The new defn must not be inline. */
2010 DECL_INLINE (newdecl) = 0;
2011 DECL_UNINLINABLE (newdecl) = 1;
2015 /* If either decl says `inline', this fn is inline,
2016 unless its definition was passed already. */
2017 if (DECL_DECLARED_INLINE_P (newdecl)
2018 && DECL_DECLARED_INLINE_P (olddecl) == 0)
2019 DECL_DECLARED_INLINE_P (olddecl) = 1;
2021 DECL_DECLARED_INLINE_P (newdecl) = DECL_DECLARED_INLINE_P (olddecl);
2023 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
2024 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
2027 if (DECL_BUILT_IN (olddecl))
2029 /* Get rid of any built-in function if new arg types don't match it
2030 or if we have a function definition. */
2031 if (! types_match || new_is_definition)
2033 if (! different_binding_level)
2035 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
2036 DECL_BUILT_IN_CLASS (olddecl) = NOT_BUILT_IN;
2041 /* If redeclaring a builtin function, and not a definition,
2042 it stays built in. */
2043 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2044 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2047 /* Also preserve various other info from the definition. */
2048 else if (! new_is_definition)
2049 DECL_NUM_STMTS (newdecl) = DECL_NUM_STMTS (olddecl);
2050 if (! new_is_definition)
2052 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2053 /* When called with different_binding_level set, don't copy over
2054 DECL_INITIAL, so that we don't accidentally change function
2055 declarations into function definitions. */
2056 if (! different_binding_level)
2057 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2058 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
2059 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2060 if (DECL_INLINE (newdecl))
2061 DECL_ABSTRACT_ORIGIN (newdecl) = DECL_ABSTRACT_ORIGIN (olddecl);
2064 if (different_binding_level)
2067 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2068 But preserve OLDDECL's DECL_UID. */
2070 unsigned olddecl_uid = DECL_UID (olddecl);
2072 memcpy ((char *) olddecl + sizeof (struct tree_common),
2073 (char *) newdecl + sizeof (struct tree_common),
2074 sizeof (struct tree_decl) - sizeof (struct tree_common));
2075 DECL_UID (olddecl) = olddecl_uid;
2078 /* NEWDECL contains the merged attribute lists.
2079 Update OLDDECL to be the same. */
2080 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2085 /* Record a decl-node X as belonging to the current lexical scope.
2086 Check for errors (such as an incompatible declaration for the same
2087 name already seen in the same scope).
2089 Returns either X or an old decl for the same name.
2090 If an old decl is returned, it may have been smashed
2091 to agree with what X says. */
2098 tree name = DECL_NAME (x);
2099 struct binding_level *b = current_binding_level;
2101 /* Functions need the lang_decl data. */
2102 if (TREE_CODE (x) == FUNCTION_DECL && ! DECL_LANG_SPECIFIC (x))
2103 DECL_LANG_SPECIFIC (x) = (struct lang_decl *)
2104 ggc_alloc_cleared (sizeof (struct lang_decl));
2106 DECL_CONTEXT (x) = current_function_decl;
2107 /* A local extern declaration for a function doesn't constitute nesting.
2108 A local auto declaration does, since it's a forward decl
2109 for a nested function coming later. */
2110 if ((TREE_CODE (x) == FUNCTION_DECL || TREE_CODE (x) == VAR_DECL)
2111 && DECL_INITIAL (x) == 0 && DECL_EXTERNAL (x))
2112 DECL_CONTEXT (x) = 0;
2114 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
2115 && x != IDENTIFIER_IMPLICIT_DECL (name)
2116 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
2117 && !DECL_IN_SYSTEM_HEADER (x))
2118 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
2124 int different_binding_level = 0;
2126 t = lookup_name_current_level (name);
2127 /* Don't type check externs here when -traditional. This is so that
2128 code with conflicting declarations inside blocks will get warnings
2129 not errors. X11 for instance depends on this. */
2130 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
2132 t = IDENTIFIER_GLOBAL_VALUE (name);
2133 /* Type decls at global scope don't conflict with externs declared
2134 inside lexical blocks. */
2135 if (t && TREE_CODE (t) == TYPE_DECL)
2137 different_binding_level = 1;
2139 if (t != 0 && t == error_mark_node)
2140 /* error_mark_node is 0 for a while during initialization! */
2143 error_with_decl (x, "`%s' used prior to declaration");
2148 file = DECL_SOURCE_FILE (t);
2149 line = DECL_SOURCE_LINE (t);
2152 /* If this decl is `static' and an implicit decl was seen previously,
2153 warn. But don't complain if -traditional,
2154 since traditional compilers don't complain. */
2155 if (! flag_traditional && TREE_PUBLIC (name)
2156 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2157 sets this for all functions. */
2158 && ! TREE_PUBLIC (x)
2159 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2160 /* We used to warn also for explicit extern followed by static,
2161 but sometimes you need to do it that way. */
2162 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2164 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2165 IDENTIFIER_POINTER (name));
2166 pedwarn_with_file_and_line
2167 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2168 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2169 "previous declaration of `%s'",
2170 IDENTIFIER_POINTER (name));
2171 TREE_THIS_VOLATILE (name) = 1;
2174 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2176 if (TREE_CODE (t) == PARM_DECL)
2178 /* Don't allow more than one "real" duplicate
2179 of a forward parm decl. */
2180 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2186 /* If we are processing a typedef statement, generate a whole new
2187 ..._TYPE node (which will be just an variant of the existing
2188 ..._TYPE node with identical properties) and then install the
2189 TYPE_DECL node generated to represent the typedef name as the
2190 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2192 The whole point here is to end up with a situation where each
2193 and every ..._TYPE node the compiler creates will be uniquely
2194 associated with AT MOST one node representing a typedef name.
2195 This way, even though the compiler substitutes corresponding
2196 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2197 early on, later parts of the compiler can always do the reverse
2198 translation and get back the corresponding typedef name. For
2201 typedef struct S MY_TYPE;
2204 Later parts of the compiler might only know that `object' was of
2205 type `struct S' if it were not for code just below. With this
2206 code however, later parts of the compiler see something like:
2208 struct S' == struct S
2209 typedef struct S' MY_TYPE;
2212 And they can then deduce (from the node for type struct S') that
2213 the original object declaration was:
2217 Being able to do this is important for proper support of protoize,
2218 and also for generating precise symbolic debugging information
2219 which takes full account of the programmer's (typedef) vocabulary.
2221 Obviously, we don't want to generate a duplicate ..._TYPE node if
2222 the TYPE_DECL node that we are now processing really represents a
2223 standard built-in type.
2225 Since all standard types are effectively declared at line zero
2226 in the source file, we can easily check to see if we are working
2227 on a standard type by checking the current value of lineno. */
2229 if (TREE_CODE (x) == TYPE_DECL)
2231 if (DECL_SOURCE_LINE (x) == 0)
2233 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2234 TYPE_NAME (TREE_TYPE (x)) = x;
2236 else if (TREE_TYPE (x) != error_mark_node
2237 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2239 tree tt = TREE_TYPE (x);
2240 DECL_ORIGINAL_TYPE (x) = tt;
2241 tt = build_type_copy (tt);
2243 TREE_USED (tt) = TREE_USED (x);
2248 /* Multiple external decls of the same identifier ought to match.
2249 Check against both global declarations (when traditional) and out of
2250 scope (limbo) block level declarations.
2252 We get warnings about inline functions where they are defined.
2253 Avoid duplicate warnings where they are used. */
2255 && ! (TREE_CODE (x) == FUNCTION_DECL && DECL_INLINE (x)))
2259 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2260 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2261 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2262 decl = IDENTIFIER_GLOBAL_VALUE (name);
2263 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2264 /* Decls in limbo are always extern, so no need to check that. */
2265 decl = IDENTIFIER_LIMBO_VALUE (name);
2269 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2270 /* If old decl is built-in, we already warned if we should. */
2271 && !DECL_BUILT_IN (decl))
2273 pedwarn_with_decl (x,
2274 "type mismatch with previous external decl");
2275 pedwarn_with_decl (decl, "previous external decl of `%s'");
2279 /* If a function has had an implicit declaration, and then is defined,
2280 make sure they are compatible. */
2282 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2283 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2284 && TREE_CODE (x) == FUNCTION_DECL
2285 && ! comptypes (TREE_TYPE (x),
2286 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2288 warning_with_decl (x, "type mismatch with previous implicit declaration");
2289 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2290 "previous implicit declaration of `%s'");
2293 /* In PCC-compatibility mode, extern decls of vars with no current decl
2294 take effect at top level no matter where they are. */
2295 if (flag_traditional && DECL_EXTERNAL (x)
2296 && lookup_name (name) == 0)
2298 tree type = TREE_TYPE (x);
2300 /* But don't do this if the type contains temporary nodes. */
2303 if (type == error_mark_node)
2305 if (TYPE_CONTEXT (type))
2307 warning_with_decl (x, "type of external `%s' is not global");
2308 /* By exiting the loop early, we leave TYPE nonzero,
2309 and thus prevent globalization of the decl. */
2312 else if (TREE_CODE (type) == FUNCTION_TYPE
2313 && TYPE_ARG_TYPES (type) != 0)
2314 /* The types might not be truly local,
2315 but the list of arg types certainly is temporary.
2316 Since prototypes are nontraditional,
2317 ok not to do the traditional thing. */
2319 type = TREE_TYPE (type);
2323 b = global_binding_level;
2326 /* This name is new in its binding level.
2327 Install the new declaration and return it. */
2328 if (b == global_binding_level)
2330 /* Install a global value. */
2332 /* If the first global decl has external linkage,
2333 warn if we later see static one. */
2334 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2335 TREE_PUBLIC (name) = 1;
2337 IDENTIFIER_GLOBAL_VALUE (name) = x;
2339 /* We no longer care about any previous block level declarations. */
2340 IDENTIFIER_LIMBO_VALUE (name) = 0;
2342 /* Don't forget if the function was used via an implicit decl. */
2343 if (IDENTIFIER_IMPLICIT_DECL (name)
2344 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2345 TREE_USED (x) = 1, TREE_USED (name) = 1;
2347 /* Don't forget if its address was taken in that way. */
2348 if (IDENTIFIER_IMPLICIT_DECL (name)
2349 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2350 TREE_ADDRESSABLE (x) = 1;
2352 /* Warn about mismatches against previous implicit decl. */
2353 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2354 /* If this real decl matches the implicit, don't complain. */
2355 && ! (TREE_CODE (x) == FUNCTION_DECL
2356 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2357 == integer_type_node)))
2358 pedwarn ("`%s' was previously implicitly declared to return `int'",
2359 IDENTIFIER_POINTER (name));
2361 /* If this decl is `static' and an `extern' was seen previously,
2362 that is erroneous. */
2363 if (TREE_PUBLIC (name)
2364 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2366 /* Okay to redeclare an ANSI built-in as static. */
2367 if (t != 0 && DECL_BUILT_IN (t))
2369 /* Okay to declare a non-ANSI built-in as anything. */
2370 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2372 /* Okay to have global type decl after an earlier extern
2373 declaration inside a lexical block. */
2374 else if (TREE_CODE (x) == TYPE_DECL)
2376 else if (IDENTIFIER_IMPLICIT_DECL (name))
2378 if (! TREE_THIS_VOLATILE (name))
2379 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2380 IDENTIFIER_POINTER (name));
2383 pedwarn ("`%s' was declared `extern' and later `static'",
2384 IDENTIFIER_POINTER (name));
2389 /* Here to install a non-global value. */
2390 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2391 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2393 IDENTIFIER_LOCAL_VALUE (name) = x;
2395 /* If this is an extern function declaration, see if we
2396 have a global definition or declaration for the function. */
2399 && TREE_CODE (x) == FUNCTION_DECL
2400 && TREE_CODE (oldglobal) == FUNCTION_DECL
2401 && DECL_EXTERNAL (x)
2402 && ! DECL_DECLARED_INLINE_P (x))
2404 /* We have one. Their types must agree. */
2405 if (! comptypes (TREE_TYPE (x),
2406 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2407 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2410 /* Inner extern decl is inline if global one is.
2411 Copy enough to really inline it. */
2412 if (DECL_DECLARED_INLINE_P (oldglobal))
2414 DECL_DECLARED_INLINE_P (x)
2415 = DECL_DECLARED_INLINE_P (oldglobal);
2416 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2417 DECL_INITIAL (x) = (current_function_decl == oldglobal
2418 ? 0 : DECL_INITIAL (oldglobal));
2419 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2420 DECL_NUM_STMTS (x) = DECL_NUM_STMTS (oldglobal);
2421 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2422 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2423 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2424 DECL_ABSTRACT_ORIGIN (x)
2425 = DECL_ABSTRACT_ORIGIN (oldglobal);
2427 /* Inner extern decl is built-in if global one is. */
2428 if (DECL_BUILT_IN (oldglobal))
2430 DECL_BUILT_IN_CLASS (x) = DECL_BUILT_IN_CLASS (oldglobal);
2431 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2433 /* Keep the arg types from a file-scope fcn defn. */
2434 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2435 && DECL_INITIAL (oldglobal)
2436 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2437 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2442 /* This case is probably sometimes the right thing to do. */
2443 /* If we have a local external declaration,
2444 then any file-scope declaration should not
2445 have been static. */
2446 if (oldlocal == 0 && oldglobal != 0
2447 && !TREE_PUBLIC (oldglobal)
2448 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2449 warning ("`%s' locally external but globally static",
2450 IDENTIFIER_POINTER (name));
2453 /* If we have a local external declaration,
2454 and no file-scope declaration has yet been seen,
2455 then if we later have a file-scope decl it must not be static. */
2457 && DECL_EXTERNAL (x)
2461 TREE_PUBLIC (name) = 1;
2463 /* Save this decl, so that we can do type checking against
2464 other decls after it falls out of scope.
2466 Only save it once. This prevents temporary decls created in
2467 expand_inline_function from being used here, since this
2468 will have been set when the inline function was parsed.
2469 It also helps give slightly better warnings. */
2470 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2471 IDENTIFIER_LIMBO_VALUE (name) = x;
2474 /* Warn if shadowing an argument at the top level of the body. */
2475 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2476 /* This warning doesn't apply to the parms of a nested fcn. */
2477 && ! current_binding_level->parm_flag
2478 /* Check that this is one level down from the parms. */
2479 && current_binding_level->level_chain->parm_flag
2480 /* Check that the decl being shadowed
2481 comes from the parm level, one level up. */
2482 && chain_member (oldlocal, current_binding_level->level_chain->names))
2484 if (TREE_CODE (oldlocal) == PARM_DECL)
2485 pedwarn ("declaration of `%s' shadows a parameter",
2486 IDENTIFIER_POINTER (name));
2488 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2489 IDENTIFIER_POINTER (name));
2492 /* Maybe warn if shadowing something else. */
2493 else if (warn_shadow && !DECL_EXTERNAL (x)
2494 /* No shadow warnings for internally generated vars. */
2495 && DECL_SOURCE_LINE (x) != 0
2496 /* No shadow warnings for vars made for inlining. */
2497 && ! DECL_FROM_INLINE (x))
2499 const char *id = IDENTIFIER_POINTER (name);
2501 if (TREE_CODE (x) == PARM_DECL
2502 && current_binding_level->level_chain->parm_flag)
2503 /* Don't warn about the parm names in function declarator
2504 within a function declarator.
2505 It would be nice to avoid warning in any function
2506 declarator in a declaration, as opposed to a definition,
2507 but there is no way to tell it's not a definition. */
2509 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2510 warning ("declaration of `%s' shadows a parameter", id);
2511 else if (oldlocal != 0)
2512 warning ("declaration of `%s' shadows previous local", id);
2513 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2514 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2515 warning ("declaration of `%s' shadows global declaration", id);
2518 /* If storing a local value, there may already be one (inherited).
2519 If so, record it for restoration when this binding level ends. */
2521 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2524 /* Keep count of variables in this level with incomplete type.
2525 If the input is erroneous, we can have error_mark in the type
2526 slot (e.g. "f(void a, ...)") - that doesn't count as an
2528 if (TREE_TYPE (x) != error_mark_node
2529 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2533 /* Put decls on list in reverse order.
2534 We will reverse them later if necessary. */
2535 TREE_CHAIN (x) = b->names;
2541 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2544 pushdecl_top_level (x)
2548 struct binding_level *b = current_binding_level;
2550 current_binding_level = global_binding_level;
2552 current_binding_level = b;
2556 /* Generate an implicit declaration for identifier FUNCTIONID
2557 as a function of type int (). Print a warning if appropriate. */
2560 implicitly_declare (functionid)
2564 int traditional_warning = 0;
2565 /* Only one "implicit declaration" warning per identifier. */
2566 int implicit_warning;
2568 /* We used to reuse an old implicit decl here,
2569 but this loses with inline functions because it can clobber
2570 the saved decl chains. */
2572 if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2573 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2576 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2578 /* Warn of implicit decl following explicit local extern decl.
2579 This is probably a program designed for traditional C. */
2580 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2581 traditional_warning = 1;
2583 /* Warn once of an implicit declaration. */
2584 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2586 DECL_EXTERNAL (decl) = 1;
2587 TREE_PUBLIC (decl) = 1;
2589 /* Record that we have an implicit decl and this is it. */
2590 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2592 /* ANSI standard says implicit declarations are in the innermost block.
2593 So we record the decl in the standard fashion.
2594 If flag_traditional is set, pushdecl does it top-level. */
2597 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2598 maybe_objc_check_decl (decl);
2600 rest_of_decl_compilation (decl, NULL, 0, 0);
2602 if (implicit_warning)
2603 implicit_decl_warning (functionid);
2604 else if (warn_traditional && traditional_warning)
2605 warning ("function `%s' was previously declared within a block",
2606 IDENTIFIER_POINTER (functionid));
2608 /* Write a record describing this implicit function declaration to the
2609 prototypes file (if requested). */
2611 gen_aux_info_record (decl, 0, 1, 0);
2613 /* Possibly apply some default attributes to this implicit declaration. */
2614 decl_attributes (&decl, NULL_TREE, 0);
2620 implicit_decl_warning (id)
2623 const char *name = IDENTIFIER_POINTER (id);
2624 if (mesg_implicit_function_declaration == 2)
2625 error ("implicit declaration of function `%s'", name);
2626 else if (mesg_implicit_function_declaration == 1)
2627 warning ("implicit declaration of function `%s'", name);
2630 /* Return zero if the declaration NEWDECL is valid
2631 when the declaration OLDDECL (assumed to be for the same name)
2632 has already been seen.
2633 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
2634 and 3 if it is a conflicting declaration. */
2637 redeclaration_error_message (newdecl, olddecl)
2638 tree newdecl, olddecl;
2640 if (TREE_CODE (newdecl) == TYPE_DECL)
2642 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2644 /* pushdecl creates distinct types for TYPE_DECLs by calling
2645 build_type_copy, so the above comparison generally fails. We do
2646 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2647 is equivalent to what this code used to do before the build_type_copy
2648 call. The variant type distinction should not matter for traditional
2649 code, because it doesn't have type qualifiers. */
2650 if (flag_traditional
2651 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
2653 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2657 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2659 /* Declarations of functions can insist on internal linkage
2660 but they can't be inconsistent with internal linkage,
2661 so there can be no error on that account.
2662 However defining the same name twice is no good. */
2663 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2664 /* However, defining once as extern inline and a second
2665 time in another way is ok. */
2666 && ! (DECL_DECLARED_INLINE_P (olddecl) && DECL_EXTERNAL (olddecl)
2667 && ! (DECL_DECLARED_INLINE_P (newdecl)
2668 && DECL_EXTERNAL (newdecl))))
2672 else if (DECL_CONTEXT (newdecl) == NULL_TREE)
2674 /* Objects declared at top level: */
2675 /* If at least one is a reference, it's ok. */
2676 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2678 /* Reject two definitions. */
2679 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2681 /* Now we have two tentative defs, or one tentative and one real def. */
2682 /* Insist that the linkage match. */
2683 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2687 else if (current_binding_level->parm_flag
2688 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2692 /* Newdecl has block scope. If olddecl has block scope also, then
2693 reject two definitions, and reject a definition together with an
2694 external reference. Otherwise, it is OK, because newdecl must
2695 be an extern reference to olddecl. */
2696 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2697 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2703 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2704 Create one if none exists so far for the current function.
2705 This function is called for both label definitions and label references. */
2711 tree decl = IDENTIFIER_LABEL_VALUE (id);
2713 if (current_function_decl == 0)
2715 error ("label %s referenced outside of any function",
2716 IDENTIFIER_POINTER (id));
2720 /* Use a label already defined or ref'd with this name. */
2723 /* But not if it is inherited and wasn't declared to be inheritable. */
2724 if (DECL_CONTEXT (decl) != current_function_decl
2725 && ! C_DECLARED_LABEL_FLAG (decl))
2726 return shadow_label (id);
2730 decl = build_decl (LABEL_DECL, id, void_type_node);
2732 /* A label not explicitly declared must be local to where it's ref'd. */
2733 DECL_CONTEXT (decl) = current_function_decl;
2735 DECL_MODE (decl) = VOIDmode;
2737 /* Say where one reference is to the label,
2738 for the sake of the error if it is not defined. */
2739 DECL_SOURCE_LINE (decl) = lineno;
2740 DECL_SOURCE_FILE (decl) = input_filename;
2742 IDENTIFIER_LABEL_VALUE (id) = decl;
2744 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2749 /* Make a label named NAME in the current function,
2750 shadowing silently any that may be inherited from containing functions
2751 or containing scopes.
2753 Note that valid use, if the label being shadowed
2754 comes from another scope in the same function,
2755 requires calling declare_nonlocal_label right away. */
2761 tree decl = IDENTIFIER_LABEL_VALUE (name);
2767 /* Check to make sure that the label hasn't already been declared
2768 at this label scope */
2769 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2770 if (TREE_VALUE (dup) == decl)
2772 error ("duplicate label declaration `%s'",
2773 IDENTIFIER_POINTER (name));
2774 error_with_decl (TREE_VALUE (dup),
2775 "this is a previous declaration");
2776 /* Just use the previous declaration. */
2777 return lookup_label (name);
2780 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2781 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2784 return lookup_label (name);
2787 /* Define a label, specifying the location in the source file.
2788 Return the LABEL_DECL node for the label, if the definition is valid.
2789 Otherwise return 0. */
2792 define_label (filename, line, name)
2793 const char *filename;
2797 tree decl = lookup_label (name);
2799 /* If label with this name is known from an outer context, shadow it. */
2800 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2802 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2803 IDENTIFIER_LABEL_VALUE (name) = 0;
2804 decl = lookup_label (name);
2807 if (warn_traditional && !in_system_header && lookup_name (name))
2808 warning_with_file_and_line (filename, line,
2809 "traditional C lacks a separate namespace for labels, identifier `%s' conflicts",
2810 IDENTIFIER_POINTER (name));
2812 if (DECL_INITIAL (decl) != 0)
2814 error_with_file_and_line (filename, line, "duplicate label `%s'",
2815 IDENTIFIER_POINTER (name));
2820 /* Mark label as having been defined. */
2821 DECL_INITIAL (decl) = error_mark_node;
2822 /* Say where in the source. */
2823 DECL_SOURCE_FILE (decl) = filename;
2824 DECL_SOURCE_LINE (decl) = line;
2829 /* Return the list of declarations of the current level.
2830 Note that this list is in reverse order unless/until
2831 you nreverse it; and when you do nreverse it, you must
2832 store the result back using `storedecls' or you will lose. */
2837 return current_binding_level->names;
2840 /* Return the list of type-tags (for structs, etc) of the current level. */
2845 return current_binding_level->tags;
2848 /* Store the list of declarations of the current level.
2849 This is done for the parameter declarations of a function being defined,
2850 after they are modified in the light of any missing parameters. */
2856 current_binding_level->names = decls;
2859 /* Similarly, store the list of tags of the current level. */
2865 current_binding_level->tags = tags;
2868 /* Given NAME, an IDENTIFIER_NODE,
2869 return the structure (or union or enum) definition for that name.
2870 Searches binding levels from BINDING_LEVEL up to the global level.
2871 If THISLEVEL_ONLY is nonzero, searches only the specified context
2872 (but skips any tag-transparent contexts to find one that is
2873 meaningful for tags).
2874 CODE says which kind of type the caller wants;
2875 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2876 If the wrong kind of type is found, an error is reported. */
2879 lookup_tag (code, name, binding_level, thislevel_only)
2880 enum tree_code code;
2881 struct binding_level *binding_level;
2885 struct binding_level *level;
2888 for (level = binding_level; level; level = level->level_chain)
2891 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2893 if (TREE_PURPOSE (tail) == name)
2895 if (TREE_CODE (TREE_VALUE (tail)) != code)
2897 /* Definition isn't the kind we were looking for. */
2898 pending_invalid_xref = name;
2899 pending_invalid_xref_file = input_filename;
2900 pending_invalid_xref_line = lineno;
2901 /* If in the same binding level as a declaration as a tag
2902 of a different type, this must not be allowed to
2903 shadow that tag, so give the error immediately.
2904 (For example, "struct foo; union foo;" is invalid.) */
2906 pending_xref_error ();
2908 return TREE_VALUE (tail);
2911 if (! level->tag_transparent)
2921 /* Print an error message now
2922 for a recent invalid struct, union or enum cross reference.
2923 We don't print them immediately because they are not invalid
2924 when used in the `struct foo;' construct for shadowing. */
2927 pending_xref_error ()
2929 if (pending_invalid_xref != 0)
2930 error_with_file_and_line (pending_invalid_xref_file,
2931 pending_invalid_xref_line,
2932 "`%s' defined as wrong kind of tag",
2933 IDENTIFIER_POINTER (pending_invalid_xref));
2934 pending_invalid_xref = 0;
2937 /* Given a type, find the tag that was defined for it and return the tag name.
2938 Otherwise return 0. */
2941 lookup_tag_reverse (type)
2944 struct binding_level *level;
2946 for (level = current_binding_level; level; level = level->level_chain)
2949 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2951 if (TREE_VALUE (tail) == type)
2952 return TREE_PURPOSE (tail);
2958 /* Look up NAME in the current binding level and its superiors
2959 in the namespace of variables, functions and typedefs.
2960 Return a ..._DECL node of some kind representing its definition,
2961 or return 0 if it is undefined. */
2969 if (current_binding_level != global_binding_level
2970 && IDENTIFIER_LOCAL_VALUE (name))
2971 val = IDENTIFIER_LOCAL_VALUE (name);
2973 val = IDENTIFIER_GLOBAL_VALUE (name);
2977 /* Similar to `lookup_name' but look only at current binding level. */
2980 lookup_name_current_level (name)
2985 if (current_binding_level == global_binding_level)
2986 return IDENTIFIER_GLOBAL_VALUE (name);
2988 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2991 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2992 if (DECL_NAME (t) == name)
2998 /* Mark ARG for GC. */
3001 mark_binding_level (arg)
3004 struct binding_level *level = *(struct binding_level **) arg;
3006 for (; level != 0; level = level->level_chain)
3008 ggc_mark_tree (level->names);
3009 ggc_mark_tree (level->tags);
3010 ggc_mark_tree (level->shadowed);
3011 ggc_mark_tree (level->blocks);
3012 ggc_mark_tree (level->this_block);
3013 ggc_mark_tree (level->parm_order);
3017 /* Create the predefined scalar types of C,
3018 and some nodes representing standard constants (0, 1, (void *) 0).
3019 Initialize the global binding level.
3020 Make definitions for built-in primitive functions. */
3023 init_decl_processing ()
3026 tree ptr_ftype_void, ptr_ftype_ptr;
3028 current_function_decl = NULL;
3029 named_labels = NULL;
3030 current_binding_level = NULL_BINDING_LEVEL;
3031 free_binding_level = NULL_BINDING_LEVEL;
3033 /* Make the binding_level structure for global names. */
3035 global_binding_level = current_binding_level;
3037 build_common_tree_nodes (flag_signed_char);
3039 c_common_nodes_and_builtins ();
3041 boolean_type_node = integer_type_node;
3042 boolean_true_node = integer_one_node;
3043 boolean_false_node = integer_zero_node;
3045 /* With GCC, C99's _Bool is always of size 1. */
3046 c_bool_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
3047 TREE_SET_CODE (c_bool_type_node, BOOLEAN_TYPE);
3048 TYPE_MAX_VALUE (c_bool_type_node) = build_int_2 (1, 0);
3049 TREE_TYPE (TYPE_MAX_VALUE (c_bool_type_node)) = c_bool_type_node;
3050 TYPE_PRECISION (c_bool_type_node) = 1;
3051 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
3053 c_bool_false_node = build_int_2 (0, 0);
3054 TREE_TYPE (c_bool_false_node) = c_bool_type_node;
3055 c_bool_true_node = build_int_2 (1, 0);
3056 TREE_TYPE (c_bool_true_node) = c_bool_type_node;
3058 endlink = void_list_node;
3059 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
3061 = build_function_type (ptr_type_node,
3062 tree_cons (NULL_TREE, ptr_type_node, endlink));
3064 /* Types which are common to the fortran compiler and libf2c. When
3065 changing these, you also need to be concerned with f/com.h. */
3067 if (TYPE_PRECISION (float_type_node)
3068 == TYPE_PRECISION (long_integer_type_node))
3070 g77_integer_type_node = long_integer_type_node;
3071 g77_uinteger_type_node = long_unsigned_type_node;
3073 else if (TYPE_PRECISION (float_type_node)
3074 == TYPE_PRECISION (integer_type_node))
3076 g77_integer_type_node = integer_type_node;
3077 g77_uinteger_type_node = unsigned_type_node;
3080 g77_integer_type_node = g77_uinteger_type_node = NULL_TREE;
3082 if (g77_integer_type_node != NULL_TREE)
3084 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_integer"),
3085 g77_integer_type_node));
3086 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_uinteger"),
3087 g77_uinteger_type_node));
3090 if (TYPE_PRECISION (float_type_node) * 2
3091 == TYPE_PRECISION (long_integer_type_node))
3093 g77_longint_type_node = long_integer_type_node;
3094 g77_ulongint_type_node = long_unsigned_type_node;
3096 else if (TYPE_PRECISION (float_type_node) * 2
3097 == TYPE_PRECISION (long_long_integer_type_node))
3099 g77_longint_type_node = long_long_integer_type_node;
3100 g77_ulongint_type_node = long_long_unsigned_type_node;
3103 g77_longint_type_node = g77_ulongint_type_node = NULL_TREE;
3105 if (g77_longint_type_node != NULL_TREE)
3107 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_longint"),
3108 g77_longint_type_node));
3109 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_ulongint"),
3110 g77_ulongint_type_node));
3113 pedantic_lvalues = pedantic;
3115 make_fname_decl = c_make_fname_decl;
3116 start_fname_decls ();
3118 incomplete_decl_finalize_hook = finish_incomplete_decl;
3120 /* Record our roots. */
3122 ggc_add_tree_root (c_global_trees, CTI_MAX);
3123 ggc_add_root (&c_stmt_tree, 1, sizeof c_stmt_tree, mark_stmt_tree);
3124 ggc_add_tree_root (&c_scope_stmt_stack, 1);
3125 ggc_add_tree_root (&named_labels, 1);
3126 ggc_add_tree_root (&shadowed_labels, 1);
3127 ggc_add_root (¤t_binding_level, 1, sizeof current_binding_level,
3128 mark_binding_level);
3129 ggc_add_root (&label_level_chain, 1, sizeof label_level_chain,
3130 mark_binding_level);
3131 ggc_add_tree_root (&static_ctors, 1);
3132 ggc_add_tree_root (&static_dtors, 1);
3135 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3136 decl, NAME is the initialization string and TYPE_DEP indicates whether
3137 NAME depended on the type of the function. As we don't yet implement
3138 delayed emission of static data, we mark the decl as emitted
3139 so it is not placed in the output. Anything using it must therefore pull
3140 out the STRING_CST initializer directly. This does mean that these names
3141 are string merging candidates, which is wrong for C99's __func__. FIXME. */
3144 c_make_fname_decl (id, type_dep)
3148 const char *name = fname_as_string (type_dep);
3149 tree decl, type, init;
3150 size_t length = strlen (name);
3152 type = build_array_type
3153 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
3154 build_index_type (size_int (length)));
3156 decl = build_decl (VAR_DECL, id, type);
3157 /* We don't push the decl, so have to set its context here. */
3158 DECL_CONTEXT (decl) = current_function_decl;
3160 TREE_STATIC (decl) = 1;
3161 TREE_READONLY (decl) = 1;
3162 DECL_ARTIFICIAL (decl) = 1;
3164 init = build_string (length + 1, name);
3165 TREE_TYPE (init) = type;
3166 DECL_INITIAL (decl) = init;
3168 TREE_USED (decl) = 1;
3170 finish_decl (decl, init, NULL_TREE);
3175 /* Return a definition for a builtin function named NAME and whose data type
3176 is TYPE. TYPE should be a function type with argument types.
3177 FUNCTION_CODE tells later passes how to compile calls to this function.
3178 See tree.h for its possible values.
3180 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3181 the name to be called if we can't opencode the function. */
3184 builtin_function (name, type, function_code, class, library_name)
3188 enum built_in_class class;
3189 const char *library_name;
3191 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3192 DECL_EXTERNAL (decl) = 1;
3193 TREE_PUBLIC (decl) = 1;
3194 /* If -traditional, permit redefining a builtin function any way you like.
3195 (Though really, if the program redefines these functions,
3196 it probably won't work right unless compiled with -fno-builtin.) */
3197 if (flag_traditional && name[0] != '_')
3198 DECL_BUILT_IN_NONANSI (decl) = 1;
3200 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
3201 make_decl_rtl (decl, NULL);
3203 DECL_BUILT_IN_CLASS (decl) = class;
3204 DECL_FUNCTION_CODE (decl) = function_code;
3206 /* Warn if a function in the namespace for users
3207 is used without an occasion to consider it declared. */
3208 if (name[0] != '_' || name[1] != '_')
3209 C_DECL_ANTICIPATED (decl) = 1;
3211 /* Possibly apply some default attributes to this built-in function. */
3212 decl_attributes (&decl, NULL_TREE, 0);
3217 /* Apply default attributes to a function, if a system function with default
3221 insert_default_attributes (decl)
3224 if (!TREE_PUBLIC (decl))
3226 c_common_insert_default_attributes (decl);
3229 /* Called when a declaration is seen that contains no names to declare.
3230 If its type is a reference to a structure, union or enum inherited
3231 from a containing scope, shadow that tag name for the current scope
3232 with a forward reference.
3233 If its type defines a new named structure or union
3234 or defines an enum, it is valid but we need not do anything here.
3235 Otherwise, it is an error. */
3238 shadow_tag (declspecs)
3241 shadow_tag_warned (declspecs, 0);
3245 shadow_tag_warned (declspecs, warned)
3248 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3255 pending_invalid_xref = 0;
3257 /* Remove the attributes from declspecs, since they will confuse the
3259 split_specs_attrs (declspecs, &specs, &attrs);
3261 for (link = specs; link; link = TREE_CHAIN (link))
3263 tree value = TREE_VALUE (link);
3264 enum tree_code code = TREE_CODE (value);
3266 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3267 /* Used to test also that TYPE_SIZE (value) != 0.
3268 That caused warning for `struct foo;' at top level in the file. */
3270 tree name = lookup_tag_reverse (value);
3277 if (warned != 1 && code != ENUMERAL_TYPE)
3278 /* Empty unnamed enum OK */
3280 pedwarn ("unnamed struct/union that defines no instances");
3286 t = lookup_tag (code, name, current_binding_level, 1);
3290 t = make_node (code);
3297 if (!warned && ! in_system_header)
3299 warning ("useless keyword or type name in empty declaration");
3306 error ("two types specified in one empty declaration");
3311 pedwarn ("empty declaration");
3315 /* Construct an array declarator. EXPR is the expression inside [], or
3316 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
3317 to the pointer to which a parameter array is converted). STATIC_P is
3318 non-zero if "static" is inside the [], zero otherwise. VLA_UNSPEC_P
3319 is non-zero is the array is [*], a VLA of unspecified length which is
3320 nevertheless a complete type (not currently implemented by GCC),
3321 zero otherwise. The declarator is constructed as an ARRAY_REF
3322 (to be decoded by grokdeclarator), whose operand 0 is what's on the
3323 left of the [] (filled by in set_array_declarator_type) and operand 1
3324 is the expression inside; whose TREE_TYPE is the type qualifiers and
3325 which has TREE_STATIC set if "static" is used. */
3328 build_array_declarator (expr, quals, static_p, vla_unspec_p)
3335 decl = build_nt (ARRAY_REF, NULL_TREE, expr);
3336 TREE_TYPE (decl) = quals;
3337 TREE_STATIC (decl) = (static_p ? 1 : 0);
3338 if (pedantic && !flag_isoc99)
3340 if (static_p || quals != NULL_TREE)
3341 pedwarn ("ISO C89 does not support `static' or type qualifiers in parameter array declarators");
3343 pedwarn ("ISO C89 does not support `[*]' array declarators");
3346 warning ("GCC does not yet properly implement `[*]' array declarators");
3350 /* Set the type of an array declarator. DECL is the declarator, as
3351 constructed by build_array_declarator; TYPE is what appears on the left
3352 of the [] and goes in operand 0. ABSTRACT_P is non-zero if it is an
3353 abstract declarator, zero otherwise; this is used to reject static and
3354 type qualifiers in abstract declarators, where they are not in the
3358 set_array_declarator_type (decl, type, abstract_p)
3363 TREE_OPERAND (decl, 0) = type;
3364 if (abstract_p && (TREE_TYPE (decl) != NULL_TREE || TREE_STATIC (decl)))
3365 error ("static or type qualifiers in abstract declarator");
3369 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3372 groktypename (typename)
3375 if (TREE_CODE (typename) != TREE_LIST)
3377 return grokdeclarator (TREE_VALUE (typename),
3378 TREE_PURPOSE (typename),
3382 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3385 groktypename_in_parm_context (typename)
3388 if (TREE_CODE (typename) != TREE_LIST)
3390 return grokdeclarator (TREE_VALUE (typename),
3391 TREE_PURPOSE (typename),
3395 /* Decode a declarator in an ordinary declaration or data definition.
3396 This is called as soon as the type information and variable name
3397 have been parsed, before parsing the initializer if any.
3398 Here we create the ..._DECL node, fill in its type,
3399 and put it on the list of decls for the current context.
3400 The ..._DECL node is returned as the value.
3402 Exception: for arrays where the length is not specified,
3403 the type is left null, to be filled in by `finish_decl'.
3405 Function definitions do not come here; they go to start_function
3406 instead. However, external and forward declarations of functions
3407 do go through here. Structure field declarations are done by
3408 grokfield and not through here. */
3411 start_decl (declarator, declspecs, initialized, attributes)
3412 tree declarator, declspecs;
3416 tree decl = grokdeclarator (declarator, declspecs,
3417 NORMAL, initialized);
3420 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3421 && MAIN_NAME_P (DECL_NAME (decl)))
3422 warning_with_decl (decl, "`%s' is usually a function");
3425 /* Is it valid for this decl to have an initializer at all?
3426 If not, set INITIALIZED to zero, which will indirectly
3427 tell `finish_decl' to ignore the initializer once it is parsed. */
3428 switch (TREE_CODE (decl))
3431 /* typedef foo = bar means give foo the same type as bar.
3432 We haven't parsed bar yet, so `finish_decl' will fix that up.
3433 Any other case of an initialization in a TYPE_DECL is an error. */
3434 if (pedantic || list_length (declspecs) > 1)
3436 error ("typedef `%s' is initialized",
3437 IDENTIFIER_POINTER (DECL_NAME (decl)));
3443 error ("function `%s' is initialized like a variable",
3444 IDENTIFIER_POINTER (DECL_NAME (decl)));
3449 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3450 error ("parameter `%s' is initialized",
3451 IDENTIFIER_POINTER (DECL_NAME (decl)));
3456 /* Don't allow initializations for incomplete types
3457 except for arrays which might be completed by the initialization. */
3459 /* This can happen if the array size is an undefined macro. We already
3460 gave a warning, so we don't need another one. */
3461 if (TREE_TYPE (decl) == error_mark_node)
3463 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3465 /* A complete type is ok if size is fixed. */
3467 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3468 || C_DECL_VARIABLE_SIZE (decl))
3470 error ("variable-sized object may not be initialized");
3474 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3476 error ("variable `%s' has initializer but incomplete type",
3477 IDENTIFIER_POINTER (DECL_NAME (decl)));
3480 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
3482 error ("elements of array `%s' have incomplete type",
3483 IDENTIFIER_POINTER (DECL_NAME (decl)));
3491 /* Seems redundant with grokdeclarator. */
3492 if (current_binding_level != global_binding_level
3493 && DECL_EXTERNAL (decl)
3494 && TREE_CODE (decl) != FUNCTION_DECL)
3495 warning ("declaration of `%s' has `extern' and is initialized",
3496 IDENTIFIER_POINTER (DECL_NAME (decl)));
3498 DECL_EXTERNAL (decl) = 0;
3499 if (current_binding_level == global_binding_level)
3500 TREE_STATIC (decl) = 1;
3502 /* Tell `pushdecl' this is an initialized decl
3503 even though we don't yet have the initializer expression.
3504 Also tell `finish_decl' it may store the real initializer. */
3505 DECL_INITIAL (decl) = error_mark_node;
3508 /* If this is a function declaration, write a record describing it to the
3509 prototypes file (if requested). */
3511 if (TREE_CODE (decl) == FUNCTION_DECL)
3512 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3514 /* ANSI specifies that a tentative definition which is not merged with
3515 a non-tentative definition behaves exactly like a definition with an
3516 initializer equal to zero. (Section 3.7.2)
3517 -fno-common gives strict ANSI behavior. Usually you don't want it.
3518 This matters only for variables with external linkage. */
3519 if (! flag_no_common || ! TREE_PUBLIC (decl))
3520 DECL_COMMON (decl) = 1;
3522 /* Set attributes here so if duplicate decl, will have proper attributes. */
3523 decl_attributes (&decl, attributes, 0);
3525 if (TREE_CODE (decl) == FUNCTION_DECL
3526 && DECL_DECLARED_INLINE_P (decl)
3527 && DECL_UNINLINABLE (decl)
3528 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
3529 warning_with_decl (decl,
3530 "inline function `%s' given attribute noinline");
3532 /* Add this decl to the current binding level.
3533 TEM may equal DECL or it may be a previous decl of the same name. */
3534 tem = pushdecl (decl);
3536 /* For a local variable, define the RTL now. */
3537 if (current_binding_level != global_binding_level
3538 /* But not if this is a duplicate decl
3539 and we preserved the rtl from the previous one
3540 (which may or may not happen). */
3541 && !DECL_RTL_SET_P (tem)
3542 && !DECL_CONTEXT (tem))
3544 if (TREE_TYPE (tem) != error_mark_node
3545 && COMPLETE_TYPE_P (TREE_TYPE (tem)))
3547 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3548 && DECL_INITIAL (tem) != 0)
3555 /* Finish processing of a declaration;
3556 install its initial value.
3557 If the length of an array type is not known before,
3558 it must be determined now, from the initial value, or it is an error. */
3561 finish_decl (decl, init, asmspec_tree)
3565 tree type = TREE_TYPE (decl);
3566 int was_incomplete = (DECL_SIZE (decl) == 0);
3567 const char *asmspec = 0;
3569 /* If a name was specified, get the string. */
3571 asmspec = TREE_STRING_POINTER (asmspec_tree);
3573 /* If `start_decl' didn't like having an initialization, ignore it now. */
3574 if (init != 0 && DECL_INITIAL (decl) == 0)
3577 /* Don't crash if parm is initialized. */
3578 if (TREE_CODE (decl) == PARM_DECL)
3583 if (TREE_CODE (decl) != TYPE_DECL)
3584 store_init_value (decl, init);
3587 /* typedef foo = bar; store the type of bar as the type of foo. */
3588 TREE_TYPE (decl) = TREE_TYPE (init);
3589 DECL_INITIAL (decl) = init = 0;
3593 /* Deduce size of array from initialization, if not already known */
3594 if (TREE_CODE (type) == ARRAY_TYPE
3595 && TYPE_DOMAIN (type) == 0
3596 && TREE_CODE (decl) != TYPE_DECL)
3599 = (TREE_STATIC (decl)
3600 /* Even if pedantic, an external linkage array
3601 may have incomplete type at first. */
3602 ? pedantic && !TREE_PUBLIC (decl)
3603 : !DECL_EXTERNAL (decl));
3605 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3607 /* Get the completed type made by complete_array_type. */
3608 type = TREE_TYPE (decl);
3611 error_with_decl (decl, "initializer fails to determine size of `%s'");
3613 else if (failure == 2)
3616 error_with_decl (decl, "array size missing in `%s'");
3617 /* If a `static' var's size isn't known,
3618 make it extern as well as static, so it does not get
3620 If it is not `static', then do not mark extern;
3621 finish_incomplete_decl will give it a default size
3622 and it will get allocated. */
3623 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3624 DECL_EXTERNAL (decl) = 1;
3627 /* TYPE_MAX_VALUE is always one less than the number of elements
3628 in the array, because we start counting at zero. Therefore,
3629 warn only if the value is less than zero. */
3630 else if (pedantic && TYPE_DOMAIN (type) != 0
3631 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3632 error_with_decl (decl, "zero or negative size array `%s'");
3634 layout_decl (decl, 0);
3637 if (TREE_CODE (decl) == VAR_DECL)
3639 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
3640 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3641 layout_decl (decl, 0);
3643 if (DECL_SIZE (decl) == 0
3644 /* Don't give an error if we already gave one earlier. */
3645 && TREE_TYPE (decl) != error_mark_node
3646 && (TREE_STATIC (decl)
3648 /* A static variable with an incomplete type
3649 is an error if it is initialized.
3650 Also if it is not file scope.
3651 Otherwise, let it through, but if it is not `extern'
3652 then it may cause an error message later. */
3653 (DECL_INITIAL (decl) != 0
3654 || DECL_CONTEXT (decl) != 0)
3656 /* An automatic variable with an incomplete type
3658 !DECL_EXTERNAL (decl)))
3660 error_with_decl (decl, "storage size of `%s' isn't known");
3661 TREE_TYPE (decl) = error_mark_node;
3664 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3665 && DECL_SIZE (decl) != 0)
3667 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3668 constant_expression_warning (DECL_SIZE (decl));
3670 error_with_decl (decl, "storage size of `%s' isn't constant");
3673 if (TREE_USED (type))
3674 TREE_USED (decl) = 1;
3677 /* If this is a function and an assembler name is specified, it isn't
3678 builtin any more. Also reset DECL_RTL so we can give it its new
3680 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3682 DECL_BUILT_IN_CLASS (decl) = NOT_BUILT_IN;
3683 SET_DECL_RTL (decl, NULL_RTX);
3684 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
3687 /* Output the assembler code and/or RTL code for variables and functions,
3688 unless the type is an undefined structure or union.
3689 If not, it will get done when the type is completed. */
3691 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3693 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3694 maybe_objc_check_decl (decl);
3696 if (!DECL_CONTEXT (decl))
3698 if (DECL_INITIAL (decl) == NULL_TREE
3699 || DECL_INITIAL (decl) == error_mark_node)
3700 /* Don't output anything
3701 when a tentative file-scope definition is seen.
3702 But at end of compilation, do output code for them. */
3703 DECL_DEFER_OUTPUT (decl) = 1;
3704 rest_of_decl_compilation (decl, asmspec,
3705 (DECL_CONTEXT (decl) == 0
3706 || TREE_ASM_WRITTEN (decl)), 0);
3710 /* This is a local variable. If there is an ASMSPEC, the
3711 user has requested that we handle it specially. */
3714 /* In conjunction with an ASMSPEC, the `register'
3715 keyword indicates that we should place the variable
3716 in a particular register. */
3717 if (DECL_REGISTER (decl))
3718 DECL_C_HARD_REGISTER (decl) = 1;
3720 /* If this is not a static variable, issue a warning.
3721 It doesn't make any sense to give an ASMSPEC for an
3722 ordinary, non-register local variable. Historically,
3723 GCC has accepted -- but ignored -- the ASMSPEC in
3725 if (TREE_CODE (decl) == VAR_DECL
3726 && !DECL_REGISTER (decl)
3727 && !TREE_STATIC (decl))
3728 warning_with_decl (decl,
3729 "ignoring asm-specifier for non-static local variable `%s'");
3731 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
3734 add_decl_stmt (decl);
3737 if (DECL_CONTEXT (decl) != 0)
3739 /* Recompute the RTL of a local array now
3740 if it used to be an incomplete type. */
3742 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3744 /* If we used it already as memory, it must stay in memory. */
3745 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3746 /* If it's still incomplete now, no init will save it. */
3747 if (DECL_SIZE (decl) == 0)
3748 DECL_INITIAL (decl) = 0;
3753 if (TREE_CODE (decl) == TYPE_DECL)
3755 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3756 maybe_objc_check_decl (decl);
3757 rest_of_decl_compilation (decl, NULL, DECL_CONTEXT (decl) == 0, 0);
3760 /* At the end of a declaration, throw away any variable type sizes
3761 of types defined inside that declaration. There is no use
3762 computing them in the following function definition. */
3763 if (current_binding_level == global_binding_level)
3764 get_pending_sizes ();
3767 /* If DECL has a cleanup, build and return that cleanup here.
3768 This is a callback called by expand_expr. */
3771 maybe_build_cleanup (decl)
3772 tree decl ATTRIBUTE_UNUSED;
3774 /* There are no cleanups in C. */
3778 /* Given a parsed parameter declaration,
3779 decode it into a PARM_DECL and push that on the current binding level.
3780 Also, for the sake of forward parm decls,
3781 record the given order of parms in `parm_order'. */
3784 push_parm_decl (parm)
3788 int old_immediate_size_expand = immediate_size_expand;
3789 /* Don't try computing parm sizes now -- wait till fn is called. */
3790 immediate_size_expand = 0;
3792 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3793 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3794 decl_attributes (&decl, TREE_VALUE (parm), 0);
3797 if (DECL_NAME (decl))
3800 olddecl = lookup_name (DECL_NAME (decl));
3801 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3802 pedwarn_with_decl (decl,
3803 "ANSI C forbids parameter `%s' shadowing typedef");
3807 decl = pushdecl (decl);
3809 immediate_size_expand = old_immediate_size_expand;
3811 current_binding_level->parm_order
3812 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3814 /* Add this decl to the current binding level. */
3815 finish_decl (decl, NULL_TREE, NULL_TREE);
3818 /* Clear the given order of parms in `parm_order'.
3819 Used at start of parm list,
3820 and also at semicolon terminating forward decls. */
3825 current_binding_level->parm_order = NULL_TREE;
3828 /* Make TYPE a complete type based on INITIAL_VALUE.
3829 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3830 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3833 complete_array_type (type, initial_value, do_default)
3838 tree maxindex = NULL_TREE;
3843 /* Note MAXINDEX is really the maximum index,
3844 one less than the size. */
3845 if (TREE_CODE (initial_value) == STRING_CST)
3848 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3849 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3852 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3854 tree elts = CONSTRUCTOR_ELTS (initial_value);
3855 maxindex = build_int_2 (-1, -1);
3856 for (; elts; elts = TREE_CHAIN (elts))
3858 if (TREE_PURPOSE (elts))
3859 maxindex = TREE_PURPOSE (elts);
3861 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3862 maxindex, integer_one_node));
3864 maxindex = copy_node (maxindex);
3868 /* Make an error message unless that happened already. */
3869 if (initial_value != error_mark_node)
3872 /* Prevent further error messages. */
3873 maxindex = build_int_2 (0, 0);
3880 maxindex = build_int_2 (0, 0);
3886 TYPE_DOMAIN (type) = build_index_type (maxindex);
3887 if (!TREE_TYPE (maxindex))
3888 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3891 /* Lay out the type now that we can get the real answer. */
3898 /* Given declspecs and a declarator,
3899 determine the name and type of the object declared
3900 and construct a ..._DECL node for it.
3901 (In one case we can return a ..._TYPE node instead.
3902 For invalid input we sometimes return 0.)
3904 DECLSPECS is a chain of tree_list nodes whose value fields
3905 are the storage classes and type specifiers.
3907 DECL_CONTEXT says which syntactic context this declaration is in:
3908 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3909 FUNCDEF for a function definition. Like NORMAL but a few different
3910 error messages in each case. Return value may be zero meaning
3911 this definition is too screwy to try to parse.
3912 PARM for a parameter declaration (either within a function prototype
3913 or before a function body). Make a PARM_DECL, or return void_type_node.
3914 TYPENAME if for a typename (in a cast or sizeof).
3915 Don't make a DECL node; just return the ..._TYPE node.
3916 FIELD for a struct or union field; make a FIELD_DECL.
3917 BITFIELD for a field with specified width.
3918 INITIALIZED is 1 if the decl has an initializer.
3920 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3921 It may also be so in the PARM case, for a prototype where the
3922 argument type is specified but not the name.
3924 This function is where the complicated C meanings of `static'
3925 and `extern' are interpreted. */
3928 grokdeclarator (declarator, declspecs, decl_context, initialized)
3931 enum decl_context decl_context;
3936 tree type = NULL_TREE;
3941 int type_quals = TYPE_UNQUALIFIED;
3943 int explicit_int = 0;
3944 int explicit_char = 0;
3945 int defaulted_int = 0;
3946 tree typedef_decl = 0;
3948 tree typedef_type = 0;
3949 int funcdef_flag = 0;
3950 enum tree_code innermost_code = ERROR_MARK;
3952 int size_varies = 0;
3953 tree decl_attr = NULL_TREE;
3954 tree array_ptr_quals = NULL_TREE;
3955 int array_parm_static = 0;
3956 tree returned_attrs = NULL_TREE;
3958 if (decl_context == BITFIELD)
3959 bitfield = 1, decl_context = FIELD;
3961 if (decl_context == FUNCDEF)
3962 funcdef_flag = 1, decl_context = NORMAL;
3964 /* Look inside a declarator for the name being declared
3965 and get it as a string, for an error message. */
3967 tree decl = declarator;
3971 switch (TREE_CODE (decl))
3976 innermost_code = TREE_CODE (decl);
3977 decl = TREE_OPERAND (decl, 0);
3981 decl = TREE_VALUE (decl);
3984 case IDENTIFIER_NODE:
3985 name = IDENTIFIER_POINTER (decl);
3996 /* A function definition's declarator must have the form of
3997 a function declarator. */
3999 if (funcdef_flag && innermost_code != CALL_EXPR)
4002 /* Anything declared one level down from the top level
4003 must be one of the parameters of a function
4004 (because the body is at least two levels down). */
4006 /* If this looks like a function definition, make it one,
4007 even if it occurs where parms are expected.
4008 Then store_parm_decls will reject it and not use it as a parm. */
4009 if (decl_context == NORMAL && !funcdef_flag
4010 && current_binding_level->parm_flag)
4011 decl_context = PARM;
4013 /* Look through the decl specs and record which ones appear.
4014 Some typespecs are defined as built-in typenames.
4015 Others, the ones that are modifiers of other types,
4016 are represented by bits in SPECBITS: set the bits for
4017 the modifiers that appear. Storage class keywords are also in SPECBITS.
4019 If there is a typedef name or a type, store the type in TYPE.
4020 This includes builtin typedefs such as `int'.
4022 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
4023 and did not come from a user typedef.
4025 Set LONGLONG if `long' is mentioned twice. */
4027 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
4029 tree id = TREE_VALUE (spec);
4031 if (id == ridpointers[(int) RID_INT])
4033 if (id == ridpointers[(int) RID_CHAR])
4036 if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
4038 enum rid i = C_RID_CODE (id);
4039 if ((int) i <= (int) RID_LAST_MODIFIER)
4041 if (i == RID_LONG && (specbits & (1 << (int) i)))
4044 error ("`long long long' is too long for GCC");
4047 if (pedantic && !flag_isoc99 && ! in_system_header
4049 pedwarn ("ISO C89 does not support `long long'");
4053 else if (specbits & (1 << (int) i))
4054 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
4055 specbits |= 1 << (int) i;
4060 error ("two or more data types in declaration of `%s'", name);
4061 /* Actual typedefs come to us as TYPE_DECL nodes. */
4062 else if (TREE_CODE (id) == TYPE_DECL)
4064 type = TREE_TYPE (id);
4065 decl_attr = DECL_ATTRIBUTES (id);
4068 /* Built-in types come as identifiers. */
4069 else if (TREE_CODE (id) == IDENTIFIER_NODE)
4071 tree t = lookup_name (id);
4072 if (TREE_TYPE (t) == error_mark_node)
4074 else if (!t || TREE_CODE (t) != TYPE_DECL)
4075 error ("`%s' fails to be a typedef or built in type",
4076 IDENTIFIER_POINTER (id));
4079 type = TREE_TYPE (t);
4083 else if (TREE_CODE (id) != ERROR_MARK)
4090 typedef_type = type;
4092 size_varies = C_TYPE_VARIABLE_SIZE (type);
4094 /* No type at all: default to `int', and set DEFAULTED_INT
4095 because it was not a user-defined typedef. */
4099 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4100 | (1 << (int) RID_SIGNED)
4101 | (1 << (int) RID_UNSIGNED)
4102 | (1 << (int) RID_COMPLEX))))
4103 /* Don't warn about typedef foo = bar. */
4104 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
4105 && ! in_system_header)
4107 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
4108 and this is a function, or if -Wimplicit; prefer the former
4109 warning since it is more explicit. */
4110 if ((warn_implicit_int || warn_return_type || flag_isoc99)
4112 warn_about_return_type = 1;
4113 else if (warn_implicit_int || flag_isoc99)
4114 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
4119 type = integer_type_node;
4122 /* Now process the modifiers that were specified
4123 and check for invalid combinations. */
4125 /* Long double is a special combination. */
4127 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4128 && TYPE_MAIN_VARIANT (type) == double_type_node)
4130 specbits &= ~(1 << (int) RID_LONG);
4131 type = long_double_type_node;
4134 /* Check all other uses of type modifiers. */
4136 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4137 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4141 if ((specbits & 1 << (int) RID_LONG)
4142 && (specbits & 1 << (int) RID_SHORT))
4143 error ("both long and short specified for `%s'", name);
4144 else if (((specbits & 1 << (int) RID_LONG)
4145 || (specbits & 1 << (int) RID_SHORT))
4147 error ("long or short specified with char for `%s'", name);
4148 else if (((specbits & 1 << (int) RID_LONG)
4149 || (specbits & 1 << (int) RID_SHORT))
4150 && TREE_CODE (type) == REAL_TYPE)
4152 static int already = 0;
4154 error ("long or short specified with floating type for `%s'", name);
4155 if (! already && ! pedantic)
4157 error ("the only valid combination is `long double'");
4161 else if ((specbits & 1 << (int) RID_SIGNED)
4162 && (specbits & 1 << (int) RID_UNSIGNED))
4163 error ("both signed and unsigned specified for `%s'", name);
4164 else if (TREE_CODE (type) != INTEGER_TYPE)
4165 error ("long, short, signed or unsigned invalid for `%s'", name);
4169 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4171 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4173 if (flag_pedantic_errors)
4178 /* Discard the type modifiers if they are invalid. */
4181 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4182 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4187 if ((specbits & (1 << (int) RID_COMPLEX))
4188 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4190 error ("complex invalid for `%s'", name);
4191 specbits &= ~(1 << (int) RID_COMPLEX);
4194 /* Decide whether an integer type is signed or not.
4195 Optionally treat bitfields as signed by default. */
4196 if (specbits & 1 << (int) RID_UNSIGNED
4197 /* Traditionally, all bitfields are unsigned. */
4198 || (bitfield && flag_traditional
4199 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4200 || (bitfield && ! flag_signed_bitfields
4201 && (explicit_int || defaulted_int || explicit_char
4202 /* A typedef for plain `int' without `signed'
4203 can be controlled just like plain `int'. */
4204 || ! (typedef_decl != 0
4205 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4206 && TREE_CODE (type) != ENUMERAL_TYPE
4207 && !(specbits & 1 << (int) RID_SIGNED)))
4210 type = long_long_unsigned_type_node;
4211 else if (specbits & 1 << (int) RID_LONG)
4212 type = long_unsigned_type_node;
4213 else if (specbits & 1 << (int) RID_SHORT)
4214 type = short_unsigned_type_node;
4215 else if (type == char_type_node)
4216 type = unsigned_char_type_node;
4217 else if (typedef_decl)
4218 type = unsigned_type (type);
4220 type = unsigned_type_node;
4222 else if ((specbits & 1 << (int) RID_SIGNED)
4223 && type == char_type_node)
4224 type = signed_char_type_node;
4226 type = long_long_integer_type_node;
4227 else if (specbits & 1 << (int) RID_LONG)
4228 type = long_integer_type_node;
4229 else if (specbits & 1 << (int) RID_SHORT)
4230 type = short_integer_type_node;
4232 if (specbits & 1 << (int) RID_COMPLEX)
4234 if (pedantic && !flag_isoc99)
4235 pedwarn ("ISO C89 does not support complex types");
4236 /* If we just have "complex", it is equivalent to
4237 "complex double", but if any modifiers at all are specified it is
4238 the complex form of TYPE. E.g, "complex short" is
4239 "complex short int". */
4241 if (defaulted_int && ! longlong
4242 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4243 | (1 << (int) RID_SIGNED)
4244 | (1 << (int) RID_UNSIGNED))))
4247 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
4248 type = complex_double_type_node;
4250 else if (type == integer_type_node)
4253 pedwarn ("ISO C does not support complex integer types");
4254 type = complex_integer_type_node;
4256 else if (type == float_type_node)
4257 type = complex_float_type_node;
4258 else if (type == double_type_node)
4259 type = complex_double_type_node;
4260 else if (type == long_double_type_node)
4261 type = complex_long_double_type_node;
4265 pedwarn ("ISO C does not support complex integer types");
4266 type = build_complex_type (type);
4270 /* Figure out the type qualifiers for the declaration. There are
4271 two ways a declaration can become qualified. One is something
4272 like `const int i' where the `const' is explicit. Another is
4273 something like `typedef const int CI; CI i' where the type of the
4274 declaration contains the `const'. */
4275 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4276 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
4277 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4278 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4279 if (constp > 1 && ! flag_isoc99)
4280 pedwarn ("duplicate `const'");
4281 if (restrictp > 1 && ! flag_isoc99)
4282 pedwarn ("duplicate `restrict'");
4283 if (volatilep > 1 && ! flag_isoc99)
4284 pedwarn ("duplicate `volatile'");
4285 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
4286 type = TYPE_MAIN_VARIANT (type);
4287 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4288 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4289 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4291 /* Warn if two storage classes are given. Default to `auto'. */
4296 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4297 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4298 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4299 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4300 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4302 /* Warn about storage classes that are invalid for certain
4303 kinds of declarations (parameters, typenames, etc.). */
4306 error ("multiple storage classes in declaration of `%s'", name);
4307 else if (funcdef_flag
4309 & ((1 << (int) RID_REGISTER)
4310 | (1 << (int) RID_AUTO)
4311 | (1 << (int) RID_TYPEDEF))))
4313 if (specbits & 1 << (int) RID_AUTO
4314 && (pedantic || current_binding_level == global_binding_level))
4315 pedwarn ("function definition declared `auto'");
4316 if (specbits & 1 << (int) RID_REGISTER)
4317 error ("function definition declared `register'");
4318 if (specbits & 1 << (int) RID_TYPEDEF)
4319 error ("function definition declared `typedef'");
4320 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4321 | (1 << (int) RID_AUTO));
4323 else if (decl_context != NORMAL && nclasses > 0)
4325 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4329 switch (decl_context)
4332 error ("storage class specified for structure field `%s'",
4336 error ("storage class specified for parameter `%s'", name);
4339 error ("storage class specified for typename");
4342 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4343 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4344 | (1 << (int) RID_EXTERN));
4347 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4349 /* `extern' with initialization is invalid if not at top level. */
4350 if (current_binding_level == global_binding_level)
4351 warning ("`%s' initialized and declared `extern'", name);
4353 error ("`%s' has both `extern' and initializer", name);
4355 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4356 && current_binding_level != global_binding_level)
4357 error ("nested function `%s' declared `extern'", name);
4358 else if (current_binding_level == global_binding_level
4359 && specbits & (1 << (int) RID_AUTO))
4360 error ("top-level declaration of `%s' specifies `auto'", name);
4363 /* Now figure out the structure of the declarator proper.
4364 Descend through it, creating more complex types, until we reach
4365 the declared identifier (or NULL_TREE, in an absolute declarator). */
4367 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4369 if (type == error_mark_node)
4371 declarator = TREE_OPERAND (declarator, 0);
4375 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4376 an INDIRECT_REF (for *...),
4377 a CALL_EXPR (for ...(...)),
4378 a TREE_LIST (for nested attributes),
4379 an identifier (for the name being declared)
4380 or a null pointer (for the place in an absolute declarator
4381 where the name was omitted).
4382 For the last two cases, we have just exited the loop.
4384 At this point, TYPE is the type of elements of an array,
4385 or for a function to return, or for a pointer to point to.
4386 After this sequence of ifs, TYPE is the type of the
4387 array or function or pointer, and DECLARATOR has had its
4388 outermost layer removed. */
4390 if (array_ptr_quals != NULL_TREE || array_parm_static)
4392 /* Only the innermost declarator (making a parameter be of
4393 array type which is converted to pointer type)
4394 may have static or type qualifiers. */
4395 error ("static or type qualifiers in non-parameter array declarator");
4396 array_ptr_quals = NULL_TREE;
4397 array_parm_static = 0;
4400 if (TREE_CODE (declarator) == TREE_LIST)
4402 /* We encode a declarator with embedded attributes using
4404 tree attrs = TREE_PURPOSE (declarator);
4407 declarator = TREE_VALUE (declarator);
4408 inner_decl = declarator;
4409 while (inner_decl != NULL_TREE
4410 && TREE_CODE (inner_decl) == TREE_LIST)
4411 inner_decl = TREE_VALUE (inner_decl);
4412 if (inner_decl == NULL_TREE
4413 || TREE_CODE (inner_decl) == IDENTIFIER_NODE)
4414 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
4415 if (TREE_CODE (inner_decl) == CALL_EXPR)
4416 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
4417 if (TREE_CODE (inner_decl) == ARRAY_REF)
4418 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
4419 returned_attrs = decl_attributes (&type,
4420 chainon (returned_attrs, attrs),
4423 else if (TREE_CODE (declarator) == ARRAY_REF)
4425 tree itype = NULL_TREE;
4426 tree size = TREE_OPERAND (declarator, 1);
4427 /* The index is a signed object `sizetype' bits wide. */
4428 tree index_type = signed_type (sizetype);
4430 array_ptr_quals = TREE_TYPE (declarator);
4431 array_parm_static = TREE_STATIC (declarator);
4433 declarator = TREE_OPERAND (declarator, 0);
4435 /* Check for some types that there cannot be arrays of. */
4437 if (VOID_TYPE_P (type))
4439 error ("declaration of `%s' as array of voids", name);
4440 type = error_mark_node;
4443 if (TREE_CODE (type) == FUNCTION_TYPE)
4445 error ("declaration of `%s' as array of functions", name);
4446 type = error_mark_node;
4449 if (size == error_mark_node)
4450 type = error_mark_node;
4452 if (type == error_mark_node)
4455 /* If size was specified, set ITYPE to a range-type for that size.
4456 Otherwise, ITYPE remains null. finish_decl may figure it out
4457 from an initial value. */
4461 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4462 STRIP_TYPE_NOPS (size);
4464 if (! INTEGRAL_TYPE_P (TREE_TYPE (size)))
4466 error ("size of array `%s' has non-integer type", name);
4467 size = integer_one_node;
4470 if (pedantic && integer_zerop (size))
4471 pedwarn ("ISO C forbids zero-size array `%s'", name);
4473 if (TREE_CODE (size) == INTEGER_CST)
4475 constant_expression_warning (size);
4476 if (tree_int_cst_sgn (size) < 0)
4478 error ("size of array `%s' is negative", name);
4479 size = integer_one_node;
4484 /* Make sure the array size remains visibly nonconstant
4485 even if it is (eg) a const variable with known value. */
4490 if (TREE_CONSTANT (size))
4491 pedwarn ("ISO C89 forbids array `%s' whose size can't be evaluated",
4494 pedwarn ("ISO C89 forbids variable-size array `%s'",
4499 if (integer_zerop (size))
4501 /* A zero-length array cannot be represented with an
4502 unsigned index type, which is what we'll get with
4503 build_index_type. Create an open-ended range instead. */
4504 itype = build_range_type (sizetype, size, NULL_TREE);
4508 /* Compute the maximum valid index, that is, size - 1.
4509 Do the calculation in index_type, so that if it is
4510 a variable the computations will be done in the
4512 itype = fold (build (MINUS_EXPR, index_type,
4513 convert (index_type, size),
4514 convert (index_type, size_one_node)));
4516 /* If that overflowed, the array is too big.
4517 ??? While a size of INT_MAX+1 technically shouldn't
4518 cause an overflow (because we subtract 1), the overflow
4519 is recorded during the conversion to index_type, before
4520 the subtraction. Handling this case seems like an
4521 unnecessary complication. */
4522 if (TREE_OVERFLOW (itype))
4524 error ("size of array `%s' is too large", name);
4525 type = error_mark_node;
4530 itype = variable_size (itype);
4531 itype = build_index_type (itype);
4534 else if (decl_context == FIELD)
4536 /* ??? Need to check somewhere that this is a structure
4537 and not a union, that this field is last, and that
4538 this structure has at least one other named member. */
4540 if (pedantic && !flag_isoc99 && !in_system_header)
4541 pedwarn ("ISO C89 does not support flexible array members");
4543 /* ISO C99 Flexible array members are effectively identical
4544 to GCC's zero-length array extension. */
4545 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4548 /* If pedantic, complain about arrays of incomplete types. */
4550 if (pedantic && !COMPLETE_TYPE_P (type))
4551 pedwarn ("array type has incomplete element type");
4554 /* We shouldn't have a function type here at all!
4555 Functions aren't allowed as array elements. */
4556 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4557 && (constp || volatilep))
4558 pedwarn ("ANSI C forbids const or volatile function types");
4561 /* Build the array type itself, then merge any constancy or
4562 volatility into the target type. We must do it in this order
4563 to ensure that the TYPE_MAIN_VARIANT field of the array type
4564 is set correctly. */
4566 type = build_array_type (type, itype);
4568 type = c_build_qualified_type (type, type_quals);
4571 C_TYPE_VARIABLE_SIZE (type) = 1;
4573 /* The GCC extension for zero-length arrays differs from
4574 ISO flexible array members in that sizeof yields zero. */
4575 if (size && integer_zerop (size))
4578 TYPE_SIZE (type) = bitsize_zero_node;
4579 TYPE_SIZE_UNIT (type) = size_zero_node;
4581 if (decl_context != PARM
4582 && (array_ptr_quals != NULL_TREE || array_parm_static))
4584 error ("static or type qualifiers in non-parameter array declarator");
4585 array_ptr_quals = NULL_TREE;
4586 array_parm_static = 0;
4589 else if (TREE_CODE (declarator) == CALL_EXPR)
4593 /* Declaring a function type.
4594 Make sure we have a valid type for the function to return. */
4595 if (type == error_mark_node)
4600 /* Warn about some types functions can't return. */
4602 if (TREE_CODE (type) == FUNCTION_TYPE)
4604 error ("`%s' declared as function returning a function", name);
4605 type = integer_type_node;
4607 if (TREE_CODE (type) == ARRAY_TYPE)
4609 error ("`%s' declared as function returning an array", name);
4610 type = integer_type_node;
4613 #ifndef TRADITIONAL_RETURN_FLOAT
4614 /* Traditionally, declaring return type float means double. */
4616 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4617 type = double_type_node;
4618 #endif /* TRADITIONAL_RETURN_FLOAT */
4620 /* Construct the function type and go to the next
4621 inner layer of declarator. */
4623 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4625 /* Say it's a definition
4626 only for the CALL_EXPR
4627 closest to the identifier. */
4628 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4629 /* Type qualifiers before the return type of the function
4630 qualify the return type, not the function type. */
4633 /* Type qualifiers on a function return type are normally
4634 permitted by the standard but have no effect, so give a
4635 warning at -W. Qualifiers on a void return type have
4636 meaning as a GNU extension, and are banned on function
4637 definitions in ISO C. FIXME: strictly we shouldn't
4638 pedwarn for qualified void return types except on function
4639 definitions, but not doing so could lead to the undesirable
4640 state of a "volatile void" function return type not being
4641 warned about, and a use of the function being compiled
4642 with GNU semantics, with no diagnostics under -pedantic. */
4643 if (VOID_TYPE_P (type) && pedantic && !in_system_header)
4644 pedwarn ("ISO C forbids qualified void function return type");
4645 else if (extra_warnings
4646 && !(VOID_TYPE_P (type)
4647 && type_quals == TYPE_QUAL_VOLATILE))
4648 warning ("type qualifiers ignored on function return type");
4650 type = c_build_qualified_type (type, type_quals);
4652 type_quals = TYPE_UNQUALIFIED;
4654 type = build_function_type (type, arg_types);
4655 declarator = TREE_OPERAND (declarator, 0);
4657 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4658 the formal parameter list of this FUNCTION_TYPE to point to
4659 the FUNCTION_TYPE node itself. */
4664 for (link = last_function_parm_tags;
4666 link = TREE_CHAIN (link))
4667 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4670 else if (TREE_CODE (declarator) == INDIRECT_REF)
4672 /* Merge any constancy or volatility into the target type
4675 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4677 pedwarn ("ISO C forbids qualified function types");
4679 type = c_build_qualified_type (type, type_quals);
4680 type_quals = TYPE_UNQUALIFIED;
4683 type = build_pointer_type (type);
4685 /* Process a list of type modifier keywords
4686 (such as const or volatile) that were given inside the `*'. */
4688 if (TREE_TYPE (declarator))
4696 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4697 typemodlist = TREE_CHAIN (typemodlist))
4699 tree qualifier = TREE_VALUE (typemodlist);
4701 if (C_IS_RESERVED_WORD (qualifier))
4703 if (C_RID_CODE (qualifier) == RID_CONST)
4705 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4707 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4717 error ("invalid type modifier within pointer declarator");
4718 if (constp > 1 && ! flag_isoc99)
4719 pedwarn ("duplicate `const'");
4720 if (volatilep > 1 && ! flag_isoc99)
4721 pedwarn ("duplicate `volatile'");
4722 if (restrictp > 1 && ! flag_isoc99)
4723 pedwarn ("duplicate `restrict'");
4725 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4726 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4727 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4730 declarator = TREE_OPERAND (declarator, 0);
4737 /* Now TYPE has the actual type. */
4739 /* Did array size calculations overflow? */
4741 if (TREE_CODE (type) == ARRAY_TYPE
4742 && COMPLETE_TYPE_P (type)
4743 && TREE_OVERFLOW (TYPE_SIZE (type)))
4745 error ("size of array `%s' is too large", name);
4746 /* If we proceed with the array type as it is, we'll eventully
4747 crash in tree_low_cst(). */
4748 type = error_mark_node;
4751 /* If this is declaring a typedef name, return a TYPE_DECL. */
4753 if (specbits & (1 << (int) RID_TYPEDEF))
4756 /* Note that the grammar rejects storage classes
4757 in typenames, fields or parameters */
4758 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4760 pedwarn ("ISO C forbids qualified function types");
4762 type = c_build_qualified_type (type, type_quals);
4763 decl = build_decl (TYPE_DECL, declarator, type);
4764 if ((specbits & (1 << (int) RID_SIGNED))
4765 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4766 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4767 decl_attributes (&decl, returned_attrs, 0);
4771 /* Detect the case of an array type of unspecified size
4772 which came, as such, direct from a typedef name.
4773 We must copy the type, so that each identifier gets
4774 a distinct type, so that each identifier's size can be
4775 controlled separately by its own initializer. */
4777 if (type != 0 && typedef_type != 0
4778 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4779 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4781 type = build_array_type (TREE_TYPE (type), 0);
4783 C_TYPE_VARIABLE_SIZE (type) = 1;
4786 /* If this is a type name (such as, in a cast or sizeof),
4787 compute the type and return it now. */
4789 if (decl_context == TYPENAME)
4791 /* Note that the grammar rejects storage classes
4792 in typenames, fields or parameters */
4793 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4795 pedwarn ("ISO C forbids const or volatile function types");
4797 type = c_build_qualified_type (type, type_quals);
4798 decl_attributes (&type, returned_attrs, 0);
4802 /* Aside from typedefs and type names (handle above),
4803 `void' at top level (not within pointer)
4804 is allowed only in public variables.
4805 We don't complain about parms either, but that is because
4806 a better error message can be made later. */
4808 if (VOID_TYPE_P (type) && decl_context != PARM
4809 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4810 && ((specbits & (1 << (int) RID_EXTERN))
4811 || (current_binding_level == global_binding_level
4813 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4815 error ("variable or field `%s' declared void", name);
4816 type = integer_type_node;
4819 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4820 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4825 if (decl_context == PARM)
4827 tree type_as_written;
4830 /* A parameter declared as an array of T is really a pointer to T.
4831 One declared as a function is really a pointer to a function. */
4833 if (TREE_CODE (type) == ARRAY_TYPE)
4835 /* Transfer const-ness of array into that of type pointed to. */
4836 type = TREE_TYPE (type);
4838 type = c_build_qualified_type (type, type_quals);
4839 type = build_pointer_type (type);
4840 type_quals = TYPE_UNQUALIFIED;
4841 if (array_ptr_quals)
4843 tree new_ptr_quals, new_ptr_attrs;
4845 split_specs_attrs (array_ptr_quals, &new_ptr_quals, &new_ptr_attrs);
4846 /* We don't yet implement attributes in this context. */
4847 if (new_ptr_attrs != NULL_TREE)
4848 warning ("attributes in parameter array declarator ignored");
4853 for (; new_ptr_quals; new_ptr_quals = TREE_CHAIN (new_ptr_quals))
4855 tree qualifier = TREE_VALUE (new_ptr_quals);
4857 if (C_IS_RESERVED_WORD (qualifier))
4859 if (C_RID_CODE (qualifier) == RID_CONST)
4861 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4863 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4873 error ("invalid type modifier within array declarator");
4875 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4876 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4877 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4881 else if (TREE_CODE (type) == FUNCTION_TYPE)
4883 if (pedantic && type_quals)
4884 pedwarn ("ISO C forbids qualified function types");
4886 type = c_build_qualified_type (type, type_quals);
4887 type = build_pointer_type (type);
4888 type_quals = TYPE_UNQUALIFIED;
4890 else if (type_quals)
4891 type = c_build_qualified_type (type, type_quals);
4893 type_as_written = type;
4895 decl = build_decl (PARM_DECL, declarator, type);
4897 C_DECL_VARIABLE_SIZE (decl) = 1;
4899 /* Compute the type actually passed in the parmlist,
4900 for the case where there is no prototype.
4901 (For example, shorts and chars are passed as ints.)
4902 When there is a prototype, this is overridden later. */
4904 if (type == error_mark_node)
4905 promoted_type = type;
4908 promoted_type = simple_type_promotes_to (type);
4909 if (! promoted_type)
4910 promoted_type = type;
4913 DECL_ARG_TYPE (decl) = promoted_type;
4914 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4916 else if (decl_context == FIELD)
4918 /* Structure field. It may not be a function. */
4920 if (TREE_CODE (type) == FUNCTION_TYPE)
4922 error ("field `%s' declared as a function", name);
4923 type = build_pointer_type (type);
4925 else if (TREE_CODE (type) != ERROR_MARK
4926 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4928 error ("field `%s' has incomplete type", name);
4929 type = error_mark_node;
4931 /* Move type qualifiers down to element of an array. */
4932 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4934 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4936 TYPE_DOMAIN (type));
4938 /* Leave the field const or volatile as well. */
4939 type_quals = TYPE_UNQUALIFIED;
4942 decl = build_decl (FIELD_DECL, declarator, type);
4943 DECL_NONADDRESSABLE_P (decl) = bitfield;
4946 C_DECL_VARIABLE_SIZE (decl) = 1;
4948 else if (TREE_CODE (type) == FUNCTION_TYPE)
4950 /* Every function declaration is "external"
4951 except for those which are inside a function body
4952 in which `auto' is used.
4953 That is a case not specified by ANSI C,
4954 and we use it for forward declarations for nested functions. */
4955 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4956 || current_binding_level == global_binding_level);
4958 if (specbits & (1 << (int) RID_AUTO)
4959 && (pedantic || current_binding_level == global_binding_level))
4960 pedwarn ("invalid storage class for function `%s'", name);
4961 if (specbits & (1 << (int) RID_REGISTER))
4962 error ("invalid storage class for function `%s'", name);
4963 /* Function declaration not at top level.
4964 Storage classes other than `extern' are not allowed
4965 and `extern' makes no difference. */
4966 if (current_binding_level != global_binding_level
4967 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4969 pedwarn ("invalid storage class for function `%s'", name);
4971 decl = build_decl (FUNCTION_DECL, declarator, type);
4972 decl = build_decl_attribute_variant (decl, decl_attr);
4974 DECL_LANG_SPECIFIC (decl) = (struct lang_decl *)
4975 ggc_alloc_cleared (sizeof (struct lang_decl));
4977 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4978 pedwarn ("ISO C forbids qualified function types");
4980 /* GNU C interprets a `volatile void' return type to indicate
4981 that the function does not return. */
4982 if ((type_quals & TYPE_QUAL_VOLATILE)
4983 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4984 warning ("`noreturn' function returns non-void value");
4987 DECL_EXTERNAL (decl) = 1;
4988 /* Record absence of global scope for `static' or `auto'. */
4990 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4992 /* Record presence of `inline', if it is reasonable. */
4993 if (MAIN_NAME_P (declarator))
4996 warning ("cannot inline function `main'");
5000 /* Assume that otherwise the function can be inlined. */
5001 DECL_INLINE (decl) = 1;
5002 DECL_DECLARED_INLINE_P (decl) = 1;
5004 if (specbits & (1 << (int) RID_EXTERN))
5005 current_extern_inline = 1;
5007 /* If -finline-functions, assume it can be inlined. This does
5008 two things: let the function be deferred until it is actually
5009 needed, and let dwarf2 know that the function is inlinable. */
5010 else if (flag_inline_trees == 2)
5012 DECL_INLINE (decl) = 1;
5013 DECL_DECLARED_INLINE_P (decl) = 0;
5018 /* It's a variable. */
5019 /* An uninitialized decl with `extern' is a reference. */
5020 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
5022 /* Move type qualifiers down to element of an array. */
5023 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
5025 int saved_align = TYPE_ALIGN(type);
5026 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
5028 TYPE_DOMAIN (type));
5029 TYPE_ALIGN (type) = saved_align;
5030 #if 0 /* Leave the variable const or volatile as well. */
5031 type_quals = TYPE_UNQUALIFIED;
5034 else if (type_quals)
5035 type = c_build_qualified_type (type, type_quals);
5037 decl = build_decl (VAR_DECL, declarator, type);
5039 C_DECL_VARIABLE_SIZE (decl) = 1;
5042 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
5044 DECL_EXTERNAL (decl) = extern_ref;
5045 /* At top level, the presence of a `static' or `register' storage
5046 class specifier, or the absence of all storage class specifiers
5047 makes this declaration a definition (perhaps tentative). Also,
5048 the absence of both `static' and `register' makes it public. */
5049 if (current_binding_level == global_binding_level)
5053 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
5054 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
5056 /* Not at top level, only `static' makes a static definition. */
5059 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
5060 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
5064 /* Record `register' declaration for warnings on &
5065 and in case doing stupid register allocation. */
5067 if (specbits & (1 << (int) RID_REGISTER))
5068 DECL_REGISTER (decl) = 1;
5070 /* Record constancy and volatility. */
5071 c_apply_type_quals_to_decl (type_quals, decl);
5073 /* If a type has volatile components, it should be stored in memory.
5074 Otherwise, the fact that those components are volatile
5075 will be ignored, and would even crash the compiler. */
5076 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
5077 mark_addressable (decl);
5079 decl_attributes (&decl, returned_attrs, 0);
5085 /* Decode the parameter-list info for a function type or function definition.
5086 The argument is the value returned by `get_parm_info' (or made in parse.y
5087 if there is an identifier list instead of a parameter decl list).
5088 These two functions are separate because when a function returns
5089 or receives functions then each is called multiple times but the order
5090 of calls is different. The last call to `grokparms' is always the one
5091 that contains the formal parameter names of a function definition.
5093 Store in `last_function_parms' a chain of the decls of parms.
5094 Also store in `last_function_parm_tags' a chain of the struct, union,
5095 and enum tags declared among the parms.
5097 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5099 FUNCDEF_FLAG is nonzero for a function definition, 0 for
5100 a mere declaration. A nonempty identifier-list gets an error message
5101 when FUNCDEF_FLAG is zero. */
5104 grokparms (parms_info, funcdef_flag)
5108 tree first_parm = TREE_CHAIN (parms_info);
5110 last_function_parms = TREE_PURPOSE (parms_info);
5111 last_function_parm_tags = TREE_VALUE (parms_info);
5113 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
5114 && !in_system_header)
5115 warning ("function declaration isn't a prototype");
5118 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
5121 pedwarn ("parameter names (without types) in function declaration");
5123 last_function_parms = first_parm;
5130 /* We no longer test FUNCDEF_FLAG.
5131 If the arg types are incomplete in a declaration,
5132 they must include undefined tags.
5133 These tags can never be defined in the scope of the declaration,
5134 so the types can never be completed,
5135 and no call can be compiled successfully. */
5137 /* In a fcn definition, arg types must be complete. */
5140 for (parm = last_function_parms, typelt = first_parm;
5142 parm = TREE_CHAIN (parm))
5143 /* Skip over any enumeration constants declared here. */
5144 if (TREE_CODE (parm) == PARM_DECL)
5146 /* Barf if the parameter itself has an incomplete type. */
5147 tree type = TREE_VALUE (typelt);
5148 if (type == error_mark_node)
5150 if (!COMPLETE_TYPE_P (type))
5152 if (funcdef_flag && DECL_NAME (parm) != 0)
5153 error ("parameter `%s' has incomplete type",
5154 IDENTIFIER_POINTER (DECL_NAME (parm)));
5156 warning ("parameter has incomplete type");
5159 TREE_VALUE (typelt) = error_mark_node;
5160 TREE_TYPE (parm) = error_mark_node;
5164 /* This has been replaced by parm_tags_warning, which
5165 uses a more accurate criterion for what to warn
5169 /* Now warn if is a pointer to an incomplete type. */
5170 while (TREE_CODE (type) == POINTER_TYPE
5171 || TREE_CODE (type) == REFERENCE_TYPE)
5172 type = TREE_TYPE (type);
5173 type = TYPE_MAIN_VARIANT (type);
5174 if (!COMPLETE_TYPE_P (type))
5176 if (DECL_NAME (parm) != 0)
5177 warning ("parameter `%s' points to incomplete type",
5178 IDENTIFIER_POINTER (DECL_NAME (parm)));
5180 warning ("parameter points to incomplete type");
5184 typelt = TREE_CHAIN (typelt);
5191 /* Return a tree_list node with info on a parameter list just parsed.
5192 The TREE_PURPOSE is a chain of decls of those parms.
5193 The TREE_VALUE is a list of structure, union and enum tags defined.
5194 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5195 This tree_list node is later fed to `grokparms'.
5197 VOID_AT_END nonzero means append `void' to the end of the type-list.
5198 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5201 get_parm_info (void_at_end)
5207 tree tags = gettags ();
5208 tree parms = getdecls ();
5210 tree order = current_binding_level->parm_order;
5212 /* Just `void' (and no ellipsis) is special. There are really no parms.
5213 But if the `void' is qualified (by `const' or `volatile') or has a
5214 storage class specifier (`register'), then the behavior is undefined;
5215 by not counting it as the special case of `void' we will cause an
5216 error later. Typedefs for `void' are OK (see DR#157). */
5217 if (void_at_end && parms != 0
5218 && TREE_CHAIN (parms) == 0
5219 && VOID_TYPE_P (TREE_TYPE (parms))
5220 && ! TREE_THIS_VOLATILE (parms)
5221 && ! TREE_READONLY (parms)
5222 && ! DECL_REGISTER (parms)
5223 && DECL_NAME (parms) == 0)
5226 storedecls (NULL_TREE);
5227 return tree_cons (NULL_TREE, NULL_TREE,
5228 tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5231 /* Extract enumerator values and other non-parms declared with the parms.
5232 Likewise any forward parm decls that didn't have real parm decls. */
5233 for (decl = parms; decl;)
5235 tree next = TREE_CHAIN (decl);
5237 if (TREE_CODE (decl) != PARM_DECL)
5239 TREE_CHAIN (decl) = new_parms;
5242 else if (TREE_ASM_WRITTEN (decl))
5244 error_with_decl (decl,
5245 "parameter `%s' has just a forward declaration");
5246 TREE_CHAIN (decl) = new_parms;
5252 /* Put the parm decls back in the order they were in in the parm list. */
5253 for (t = order; t; t = TREE_CHAIN (t))
5256 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5258 TREE_CHAIN (TREE_VALUE (t)) = 0;
5261 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5264 /* Store the parmlist in the binding level since the old one
5265 is no longer a valid list. (We have changed the chain pointers.) */
5266 storedecls (new_parms);
5268 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5269 /* There may also be declarations for enumerators if an enumeration
5270 type is declared among the parms. Ignore them here. */
5271 if (TREE_CODE (decl) == PARM_DECL)
5273 /* Since there is a prototype,
5274 args are passed in their declared types. */
5275 tree type = TREE_TYPE (decl);
5276 DECL_ARG_TYPE (decl) = type;
5277 if (PROMOTE_PROTOTYPES
5278 && INTEGRAL_TYPE_P (type)
5279 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5280 DECL_ARG_TYPE (decl) = integer_type_node;
5282 types = tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5283 if (VOID_TYPE_P (TREE_VALUE (types)) && ! erred
5284 && DECL_NAME (decl) == 0)
5286 error ("`void' in parameter list must be the entire list");
5292 return tree_cons (new_parms, tags,
5293 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
5295 return tree_cons (new_parms, tags, nreverse (types));
5298 /* At end of parameter list, warn about any struct, union or enum tags
5299 defined within. Do so because these types cannot ever become complete. */
5302 parmlist_tags_warning ()
5307 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5309 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5310 /* An anonymous union parm type is meaningful as a GNU extension.
5311 So don't warn for that. */
5312 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5314 if (TREE_PURPOSE (elt) != 0)
5315 warning ("`%s %s' declared inside parameter list",
5316 (code == RECORD_TYPE ? "struct"
5317 : code == UNION_TYPE ? "union"
5319 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5322 /* For translation these need to be separate warnings */
5323 if (code == RECORD_TYPE)
5324 warning ("anonymous struct declared inside parameter list");
5325 else if (code == UNION_TYPE)
5326 warning ("anonymous union declared inside parameter list");
5328 warning ("anonymous enum declared inside parameter list");
5332 warning ("its scope is only this definition or declaration, which is probably not what you want.");
5338 /* Get the struct, enum or union (CODE says which) with tag NAME.
5339 Define the tag as a forward-reference if it is not defined. */
5342 xref_tag (code, name)
5343 enum tree_code code;
5346 /* If a cross reference is requested, look up the type
5347 already defined for this tag and return it. */
5349 tree ref = lookup_tag (code, name, current_binding_level, 0);
5350 /* If this is the right type of tag, return what we found.
5351 (This reference will be shadowed by shadow_tag later if appropriate.)
5352 If this is the wrong type of tag, do not return it. If it was the
5353 wrong type in the same binding level, we will have had an error
5354 message already; if in a different binding level and declaring
5355 a name, pending_xref_error will give an error message; but if in a
5356 different binding level and not declaring a name, this tag should
5357 shadow the previous declaration of a different type of tag, and
5358 this would not work properly if we return the reference found.
5359 (For example, with "struct foo" in an outer scope, "union foo;"
5360 must shadow that tag with a new one of union type.) */
5361 if (ref && TREE_CODE (ref) == code)
5364 /* If no such tag is yet defined, create a forward-reference node
5365 and record it as the "definition".
5366 When a real declaration of this type is found,
5367 the forward-reference will be altered into a real type. */
5369 ref = make_node (code);
5370 if (code == ENUMERAL_TYPE)
5372 /* Give the type a default layout like unsigned int
5373 to avoid crashing if it does not get defined. */
5374 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5375 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5376 TYPE_USER_ALIGN (ref) = 0;
5377 TREE_UNSIGNED (ref) = 1;
5378 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5379 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5380 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5383 pushtag (name, ref);
5388 /* Make sure that the tag NAME is defined *in the current binding level*
5389 at least as a forward reference.
5390 CODE says which kind of tag NAME ought to be. */
5393 start_struct (code, name)
5394 enum tree_code code;
5397 /* If there is already a tag defined at this binding level
5398 (as a forward reference), just return it. */
5403 ref = lookup_tag (code, name, current_binding_level, 1);
5404 if (ref && TREE_CODE (ref) == code)
5406 C_TYPE_BEING_DEFINED (ref) = 1;
5407 TYPE_PACKED (ref) = flag_pack_struct;
5408 if (TYPE_FIELDS (ref))
5409 error ("redefinition of `%s %s'",
5410 code == UNION_TYPE ? "union" : "struct",
5411 IDENTIFIER_POINTER (name));
5416 /* Otherwise create a forward-reference just so the tag is in scope. */
5418 ref = make_node (code);
5419 pushtag (name, ref);
5420 C_TYPE_BEING_DEFINED (ref) = 1;
5421 TYPE_PACKED (ref) = flag_pack_struct;
5425 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5426 of a structure component, returning a FIELD_DECL node.
5427 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5429 This is done during the parsing of the struct declaration.
5430 The FIELD_DECL nodes are chained together and the lot of them
5431 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5434 grokfield (filename, line, declarator, declspecs, width)
5435 const char *filename ATTRIBUTE_UNUSED;
5436 int line ATTRIBUTE_UNUSED;
5437 tree declarator, declspecs, width;
5441 if (declarator == NULL_TREE && width == NULL_TREE)
5443 /* This is an unnamed decl. We only support unnamed
5444 structs/unions, so check for other things and refuse them. */
5445 if (TREE_CODE (TREE_VALUE (declspecs)) != RECORD_TYPE
5446 && TREE_CODE (TREE_VALUE (declspecs)) != UNION_TYPE)
5448 error ("unnamed fields of type other than struct or union are not allowed");
5453 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5455 finish_decl (value, NULL_TREE, NULL_TREE);
5456 DECL_INITIAL (value) = width;
5458 maybe_objc_check_decl (value);
5462 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5463 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5464 ATTRIBUTES are attributes to be applied to the structure. */
5467 finish_struct (t, fieldlist, attributes)
5473 int toplevel = global_binding_level == current_binding_level;
5474 int saw_named_field;
5476 /* If this type was previously laid out as a forward reference,
5477 make sure we lay it out again. */
5481 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5483 /* Nameless union parm types are useful as GCC extension. */
5484 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5485 /* Otherwise, warn about any struct or union def. in parmlist. */
5486 if (in_parm_level_p ())
5489 pedwarn ("%s defined inside parms",
5490 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5491 else if (! flag_traditional)
5492 warning ("%s defined inside parms",
5493 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5498 for (x = fieldlist; x; x = TREE_CHAIN (x))
5499 if (DECL_NAME (x) != 0)
5503 pedwarn ("%s has no %s",
5504 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
5505 fieldlist ? _("named members") : _("members"));
5508 /* Install struct as DECL_CONTEXT of each field decl.
5509 Also process specified field sizes,m which is found in the DECL_INITIAL.
5510 Store 0 there, except for ": 0" fields (so we can find them
5511 and delete them, below). */
5513 saw_named_field = 0;
5514 for (x = fieldlist; x; x = TREE_CHAIN (x))
5516 DECL_CONTEXT (x) = t;
5517 DECL_PACKED (x) |= TYPE_PACKED (t);
5519 /* If any field is const, the structure type is pseudo-const. */
5520 if (TREE_READONLY (x))
5521 C_TYPE_FIELDS_READONLY (t) = 1;
5524 /* A field that is pseudo-const makes the structure likewise. */
5525 tree t1 = TREE_TYPE (x);
5526 while (TREE_CODE (t1) == ARRAY_TYPE)
5527 t1 = TREE_TYPE (t1);
5528 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5529 && C_TYPE_FIELDS_READONLY (t1))
5530 C_TYPE_FIELDS_READONLY (t) = 1;
5533 /* Any field that is volatile means variables of this type must be
5534 treated in some ways as volatile. */
5535 if (TREE_THIS_VOLATILE (x))
5536 C_TYPE_FIELDS_VOLATILE (t) = 1;
5538 /* Any field of nominal variable size implies structure is too. */
5539 if (C_DECL_VARIABLE_SIZE (x))
5540 C_TYPE_VARIABLE_SIZE (t) = 1;
5542 /* Detect invalid nested redefinition. */
5543 if (TREE_TYPE (x) == t)
5544 error ("nested redefinition of `%s'",
5545 IDENTIFIER_POINTER (TYPE_NAME (t)));
5547 /* Detect invalid bit-field size. */
5548 if (DECL_INITIAL (x))
5549 STRIP_NOPS (DECL_INITIAL (x));
5550 if (DECL_INITIAL (x))
5552 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5553 constant_expression_warning (DECL_INITIAL (x));
5557 "bit-field `%s' width not an integer constant");
5558 DECL_INITIAL (x) = NULL;
5562 /* Detect invalid bit-field type. */
5563 if (DECL_INITIAL (x)
5564 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5565 && TREE_CODE (TREE_TYPE (x)) != BOOLEAN_TYPE
5566 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5568 error_with_decl (x, "bit-field `%s' has invalid type");
5569 DECL_INITIAL (x) = NULL;
5572 if (DECL_INITIAL (x) && pedantic
5573 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5574 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5575 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != c_bool_type_node
5576 /* Accept an enum that's equivalent to int or unsigned int. */
5577 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5578 && (TYPE_PRECISION (TREE_TYPE (x))
5579 == TYPE_PRECISION (integer_type_node))))
5580 pedwarn_with_decl (x, "bit-field `%s' type invalid in ISO C");
5582 /* Detect and ignore out of range field width and process valid
5584 if (DECL_INITIAL (x))
5587 if (TYPE_MAIN_VARIANT (TREE_TYPE (x)) == c_bool_type_node)
5588 max_width = CHAR_TYPE_SIZE;
5590 max_width = TYPE_PRECISION (TREE_TYPE (x));
5591 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5592 error_with_decl (x, "negative width in bit-field `%s'");
5593 else if (0 < compare_tree_int (DECL_INITIAL (x), max_width))
5594 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5595 else if (integer_zerop (DECL_INITIAL (x)) && DECL_NAME (x) != 0)
5596 error_with_decl (x, "zero width for bit-field `%s'");
5599 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
5600 unsigned HOST_WIDE_INT width
5601 = TREE_INT_CST_LOW (DECL_INITIAL (x));
5603 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5604 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5605 TREE_UNSIGNED (TREE_TYPE (x)))
5607 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5608 TREE_UNSIGNED (TREE_TYPE (x))))))
5609 warning_with_decl (x,
5610 "`%s' is narrower than values of its type");
5612 DECL_SIZE (x) = bitsize_int (width);
5613 DECL_BIT_FIELD (x) = 1;
5614 SET_DECL_C_BIT_FIELD (x);
5618 /* field size 0 => force desired amount of alignment. */
5619 #ifdef EMPTY_FIELD_BOUNDARY
5620 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5622 #ifdef PCC_BITFIELD_TYPE_MATTERS
5623 if (PCC_BITFIELD_TYPE_MATTERS)
5625 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5626 TYPE_ALIGN (TREE_TYPE (x)));
5627 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5634 else if (TREE_TYPE (x) != error_mark_node)
5636 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5637 : TYPE_ALIGN (TREE_TYPE (x)));
5639 /* Non-bit-fields are aligned for their type, except packed
5640 fields which require only BITS_PER_UNIT alignment. */
5641 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5642 if (! DECL_PACKED (x))
5643 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5646 DECL_INITIAL (x) = 0;
5648 /* Detect flexible array member in an invalid context. */
5649 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5650 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5651 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5652 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5654 if (TREE_CODE (t) == UNION_TYPE)
5655 error_with_decl (x, "flexible array member in union");
5656 else if (TREE_CHAIN (x) != NULL_TREE)
5657 error_with_decl (x, "flexible array member not at end of struct");
5658 else if (! saw_named_field)
5659 error_with_decl (x, "flexible array member in otherwise empty struct");
5662 saw_named_field = 1;
5665 /* Delete all duplicate fields from the fieldlist */
5666 for (x = fieldlist; x && TREE_CHAIN (x);)
5667 /* Anonymous fields aren't duplicates. */
5668 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5676 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5682 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5684 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5685 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5691 /* Now we have the nearly final fieldlist. Record it,
5692 then lay out the structure or union (including the fields). */
5694 TYPE_FIELDS (t) = fieldlist;
5698 /* Delete all zero-width bit-fields from the fieldlist */
5700 tree *fieldlistp = &fieldlist;
5702 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5703 *fieldlistp = TREE_CHAIN (*fieldlistp);
5705 fieldlistp = &TREE_CHAIN (*fieldlistp);
5708 /* Now we have the truly final field list.
5709 Store it in this type and in the variants. */
5711 TYPE_FIELDS (t) = fieldlist;
5713 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5715 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5716 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5717 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5718 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5721 /* If this was supposed to be a transparent union, but we can't
5722 make it one, warn and turn off the flag. */
5723 if (TREE_CODE (t) == UNION_TYPE
5724 && TYPE_TRANSPARENT_UNION (t)
5725 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5727 TYPE_TRANSPARENT_UNION (t) = 0;
5728 warning ("union cannot be made transparent");
5731 /* If this structure or union completes the type of any previous
5732 variable declaration, lay it out and output its rtl. */
5734 if (current_binding_level->n_incomplete != 0)
5737 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5739 if (TYPE_MAIN_VARIANT (TREE_TYPE (decl)) == TYPE_MAIN_VARIANT (t)
5740 && TREE_CODE (decl) != TYPE_DECL)
5742 layout_decl (decl, 0);
5743 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5744 maybe_objc_check_decl (decl);
5745 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5748 --current_binding_level->n_incomplete;
5750 else if (!COMPLETE_TYPE_P (TREE_TYPE (decl))
5751 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5753 tree element = TREE_TYPE (decl);
5754 while (TREE_CODE (element) == ARRAY_TYPE)
5755 element = TREE_TYPE (element);
5757 layout_array_type (TREE_TYPE (decl));
5762 /* Finish debugging output for this type. */
5763 rest_of_type_compilation (t, toplevel);
5768 /* Lay out the type T, and its element type, and so on. */
5771 layout_array_type (t)
5774 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5775 layout_array_type (TREE_TYPE (t));
5779 /* Begin compiling the definition of an enumeration type.
5780 NAME is its name (or null if anonymous).
5781 Returns the type object, as yet incomplete.
5782 Also records info about it so that build_enumerator
5783 may be used to declare the individual values as they are read. */
5791 /* If this is the real definition for a previous forward reference,
5792 fill in the contents in the same object that used to be the
5793 forward reference. */
5796 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5798 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5800 enumtype = make_node (ENUMERAL_TYPE);
5801 pushtag (name, enumtype);
5804 C_TYPE_BEING_DEFINED (enumtype) = 1;
5806 if (TYPE_VALUES (enumtype) != 0)
5808 /* This enum is a named one that has been declared already. */
5809 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5811 /* Completely replace its old definition.
5812 The old enumerators remain defined, however. */
5813 TYPE_VALUES (enumtype) = 0;
5816 enum_next_value = integer_zero_node;
5819 if (flag_short_enums)
5820 TYPE_PACKED (enumtype) = 1;
5825 /* After processing and defining all the values of an enumeration type,
5826 install their decls in the enumeration type and finish it off.
5827 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5828 and ATTRIBUTES are the specified attributes.
5829 Returns ENUMTYPE. */
5832 finish_enum (enumtype, values, attributes)
5838 tree minnode = 0, maxnode = 0, enum_value_type;
5839 int precision, unsign;
5840 int toplevel = (global_binding_level == current_binding_level);
5842 if (in_parm_level_p ())
5843 warning ("enum defined inside parms");
5845 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5847 /* Calculate the maximum value of any enumerator in this type. */
5849 if (values == error_mark_node)
5850 minnode = maxnode = integer_zero_node;
5853 minnode = maxnode = TREE_VALUE (values);
5854 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5856 tree value = TREE_VALUE (pair);
5857 if (tree_int_cst_lt (maxnode, value))
5859 if (tree_int_cst_lt (value, minnode))
5864 /* Construct the final type of this enumeration. It is the same
5865 as one of the integral types - the narrowest one that fits, except
5866 that normally we only go as narrow as int - and signed iff any of
5867 the values are negative. */
5868 unsign = (tree_int_cst_sgn (minnode) >= 0);
5869 precision = MAX (min_precision (minnode, unsign),
5870 min_precision (maxnode, unsign));
5871 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5873 tree narrowest = type_for_size (precision, unsign);
5876 warning ("enumeration values exceed range of largest integer");
5877 narrowest = long_long_integer_type_node;
5880 precision = TYPE_PRECISION (narrowest);
5883 precision = TYPE_PRECISION (integer_type_node);
5885 if (precision == TYPE_PRECISION (integer_type_node))
5886 enum_value_type = type_for_size (precision, 0);
5888 enum_value_type = enumtype;
5890 TYPE_MIN_VALUE (enumtype) = minnode;
5891 TYPE_MAX_VALUE (enumtype) = maxnode;
5892 TYPE_PRECISION (enumtype) = precision;
5893 TREE_UNSIGNED (enumtype) = unsign;
5894 TYPE_SIZE (enumtype) = 0;
5895 layout_type (enumtype);
5897 if (values != error_mark_node)
5899 /* Change the type of the enumerators to be the enum type. We
5900 need to do this irrespective of the size of the enum, for
5901 proper type checking. Replace the DECL_INITIALs of the
5902 enumerators, and the value slots of the list, with copies
5903 that have the enum type; they cannot be modified in place
5904 because they may be shared (e.g. integer_zero_node) Finally,
5905 change the purpose slots to point to the names of the decls. */
5906 for (pair = values; pair; pair = TREE_CHAIN (pair))
5908 tree enu = TREE_PURPOSE (pair);
5910 TREE_TYPE (enu) = enumtype;
5911 DECL_SIZE (enu) = TYPE_SIZE (enumtype);
5912 DECL_SIZE_UNIT (enu) = TYPE_SIZE_UNIT (enumtype);
5913 DECL_ALIGN (enu) = TYPE_ALIGN (enumtype);
5914 DECL_USER_ALIGN (enu) = TYPE_USER_ALIGN (enumtype);
5915 DECL_MODE (enu) = TYPE_MODE (enumtype);
5917 /* The ISO C Standard mandates enumerators to have type int,
5918 even though the underlying type of an enum type is
5919 unspecified. Here we convert any enumerators that fit in
5920 an int to type int, to avoid promotions to unsigned types
5921 when comparing integers with enumerators that fit in the
5922 int range. When -pedantic is given, build_enumerator()
5923 would have already taken care of those that don't fit. */
5924 if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
5925 DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
5927 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5929 TREE_PURPOSE (pair) = DECL_NAME (enu);
5930 TREE_VALUE (pair) = DECL_INITIAL (enu);
5933 TYPE_VALUES (enumtype) = values;
5936 /* Fix up all variant types of this enum type. */
5937 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5939 if (tem == enumtype)
5941 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5942 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5943 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5944 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5945 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5946 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5947 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5948 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5949 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5950 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5953 /* Finish debugging output for this type. */
5954 rest_of_type_compilation (enumtype, toplevel);
5959 /* Build and install a CONST_DECL for one value of the
5960 current enumeration type (one that was begun with start_enum).
5961 Return a tree-list containing the CONST_DECL and its value.
5962 Assignment of sequential values by default is handled here. */
5965 build_enumerator (name, value)
5970 /* Validate and default VALUE. */
5972 /* Remove no-op casts from the value. */
5974 STRIP_TYPE_NOPS (value);
5978 if (TREE_CODE (value) == INTEGER_CST)
5980 value = default_conversion (value);
5981 constant_expression_warning (value);
5985 error ("enumerator value for `%s' not integer constant",
5986 IDENTIFIER_POINTER (name));
5991 /* Default based on previous value. */
5992 /* It should no longer be possible to have NON_LVALUE_EXPR
5996 value = enum_next_value;
5998 error ("overflow in enumeration values");
6001 if (pedantic && ! int_fits_type_p (value, integer_type_node))
6003 pedwarn ("ISO C restricts enumerator values to range of `int'");
6004 value = convert (integer_type_node, value);
6007 /* Set basis for default for next value. */
6008 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
6009 enum_overflow = tree_int_cst_lt (enum_next_value, value);
6011 /* Now create a declaration for the enum value name. */
6013 type = TREE_TYPE (value);
6014 type = type_for_size (MAX (TYPE_PRECISION (type),
6015 TYPE_PRECISION (integer_type_node)),
6017 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
6018 && TREE_UNSIGNED (type)));
6020 decl = build_decl (CONST_DECL, name, type);
6021 DECL_INITIAL (decl) = convert (type, value);
6024 return tree_cons (decl, value, NULL_TREE);
6028 /* Create the FUNCTION_DECL for a function definition.
6029 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
6030 the declaration; they describe the function's name and the type it returns,
6031 but twisted together in a fashion that parallels the syntax of C.
6033 This function creates a binding context for the function body
6034 as well as setting up the FUNCTION_DECL in current_function_decl.
6036 Returns 1 on success. If the DECLARATOR is not suitable for a function
6037 (it defines a datum instead), we return 0, which tells
6038 yyparse to report a parse error. */
6041 start_function (declspecs, declarator, attributes)
6042 tree declarator, declspecs, attributes;
6044 tree decl1, old_decl;
6046 int old_immediate_size_expand = immediate_size_expand;
6048 current_function_returns_value = 0; /* Assume, until we see it does. */
6049 current_function_returns_null = 0;
6050 warn_about_return_type = 0;
6051 current_extern_inline = 0;
6052 c_function_varargs = 0;
6054 shadowed_labels = 0;
6056 /* Don't expand any sizes in the return type of the function. */
6057 immediate_size_expand = 0;
6059 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
6061 /* If the declarator is not suitable for a function definition,
6062 cause a syntax error. */
6065 immediate_size_expand = old_immediate_size_expand;
6069 decl_attributes (&decl1, attributes, 0);
6071 if (DECL_DECLARED_INLINE_P (decl1)
6072 && DECL_UNINLINABLE (decl1)
6073 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
6074 warning_with_decl (decl1,
6075 "inline function `%s' given attribute noinline");
6077 announce_function (decl1);
6079 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
6081 error ("return type is an incomplete type");
6082 /* Make it return void instead. */
6084 = build_function_type (void_type_node,
6085 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
6088 if (warn_about_return_type)
6089 pedwarn_c99 ("return type defaults to `int'");
6091 /* Save the parm names or decls from this function's declarator
6092 where store_parm_decls will find them. */
6093 current_function_parms = last_function_parms;
6094 current_function_parm_tags = last_function_parm_tags;
6096 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6097 error_mark_node is replaced below (in poplevel) with the BLOCK. */
6098 DECL_INITIAL (decl1) = error_mark_node;
6100 /* If this definition isn't a prototype and we had a prototype declaration
6101 before, copy the arg type info from that prototype.
6102 But not if what we had before was a builtin function. */
6103 old_decl = lookup_name_current_level (DECL_NAME (decl1));
6104 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
6105 && !DECL_BUILT_IN (old_decl)
6106 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6107 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
6108 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
6110 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
6111 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
6112 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
6115 /* If there is no explicit declaration, look for any out-of-scope implicit
6118 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
6120 /* Optionally warn of old-fashioned def with no previous prototype. */
6121 if (warn_strict_prototypes
6122 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6124 && (TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0
6125 || (DECL_BUILT_IN (old_decl)
6126 && ! C_DECL_ANTICIPATED (old_decl)))))
6127 warning ("function declaration isn't a prototype");
6128 /* Optionally warn of any global def with no previous prototype. */
6129 else if (warn_missing_prototypes
6130 && TREE_PUBLIC (decl1)
6132 && (TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0
6133 || (DECL_BUILT_IN (old_decl)
6134 && ! C_DECL_ANTICIPATED (old_decl))))
6135 && ! MAIN_NAME_P (DECL_NAME (decl1)))
6136 warning_with_decl (decl1, "no previous prototype for `%s'");
6137 /* Optionally warn of any def with no previous prototype
6138 if the function has already been used. */
6139 else if (warn_missing_prototypes
6140 && old_decl != 0 && TREE_USED (old_decl)
6141 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6142 warning_with_decl (decl1,
6143 "`%s' was used with no prototype before its definition");
6144 /* Optionally warn of any global def with no previous declaration. */
6145 else if (warn_missing_declarations
6146 && TREE_PUBLIC (decl1)
6148 && ! MAIN_NAME_P (DECL_NAME (decl1)))
6149 warning_with_decl (decl1, "no previous declaration for `%s'");
6150 /* Optionally warn of any def with no previous declaration
6151 if the function has already been used. */
6152 else if (warn_missing_declarations
6153 && old_decl != 0 && TREE_USED (old_decl)
6154 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
6155 warning_with_decl (decl1,
6156 "`%s' was used with no declaration before its definition");
6158 /* This is a definition, not a reference.
6159 So normally clear DECL_EXTERNAL.
6160 However, `extern inline' acts like a declaration
6161 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6162 DECL_EXTERNAL (decl1) = current_extern_inline;
6164 /* This function exists in static storage.
6165 (This does not mean `static' in the C sense!) */
6166 TREE_STATIC (decl1) = 1;
6168 /* A nested function is not global. */
6169 if (current_function_decl != 0)
6170 TREE_PUBLIC (decl1) = 0;
6172 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6173 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
6178 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6179 != integer_type_node)
6180 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
6182 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
6183 args = TREE_CHAIN (args))
6185 tree type = args ? TREE_VALUE (args) : 0;
6187 if (type == void_type_node)
6194 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6195 pedwarn_with_decl (decl1,
6196 "first argument of `%s' should be `int'");
6200 if (TREE_CODE (type) != POINTER_TYPE
6201 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6202 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6204 pedwarn_with_decl (decl1,
6205 "second argument of `%s' should be `char **'");
6209 if (TREE_CODE (type) != POINTER_TYPE
6210 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6211 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6213 pedwarn_with_decl (decl1,
6214 "third argument of `%s' should probably be `char **'");
6219 /* It is intentional that this message does not mention the third
6220 argument because it's only mentioned in an appendix of the
6222 if (argct > 0 && (argct < 2 || argct > 3))
6223 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
6225 if (! TREE_PUBLIC (decl1))
6226 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
6229 /* Record the decl so that the function name is defined.
6230 If we already have a decl for this name, and it is a FUNCTION_DECL,
6231 use the old decl. */
6233 current_function_decl = pushdecl (decl1);
6236 declare_parm_level (1);
6237 current_binding_level->subblocks_tag_transparent = 1;
6239 make_decl_rtl (current_function_decl, NULL);
6241 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6242 /* Promote the value to int before returning it. */
6243 if (c_promoting_integer_type_p (restype))
6245 /* It retains unsignedness if traditional
6246 or if not really getting wider. */
6247 if (TREE_UNSIGNED (restype)
6248 && (flag_traditional
6249 || (TYPE_PRECISION (restype)
6250 == TYPE_PRECISION (integer_type_node))))
6251 restype = unsigned_type_node;
6253 restype = integer_type_node;
6255 DECL_RESULT (current_function_decl)
6256 = build_decl (RESULT_DECL, NULL_TREE, restype);
6258 /* If this fcn was already referenced via a block-scope `extern' decl
6259 (or an implicit decl), propagate certain information about the usage. */
6260 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6261 TREE_ADDRESSABLE (current_function_decl) = 1;
6263 immediate_size_expand = old_immediate_size_expand;
6265 start_fname_decls ();
6270 /* Record that this function is going to be a varargs function.
6271 This is called before store_parm_decls, which is too early
6272 to call mark_varargs directly. */
6277 c_function_varargs = 1;
6280 /* Store the parameter declarations into the current function declaration.
6281 This is called after parsing the parameter declarations, before
6282 digesting the body of the function.
6284 For an old-style definition, modify the function's type
6285 to specify at least the number of arguments. */
6290 tree fndecl = current_function_decl;
6293 /* This is either a chain of PARM_DECLs (if a prototype was used)
6294 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6295 tree specparms = current_function_parms;
6297 /* This is a list of types declared among parms in a prototype. */
6298 tree parmtags = current_function_parm_tags;
6300 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6301 tree parmdecls = getdecls ();
6303 /* This is a chain of any other decls that came in among the parm
6304 declarations. If a parm is declared with enum {foo, bar} x;
6305 then CONST_DECLs for foo and bar are put here. */
6308 /* Nonzero if this definition is written with a prototype. */
6311 /* The function containing FNDECL, if any. */
6312 tree context = decl_function_context (fndecl);
6314 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6316 /* This case is when the function was defined with an ANSI prototype.
6317 The parms already have decls, so we need not do anything here
6318 except record them as in effect
6319 and complain if any redundant old-style parm decls were written. */
6330 error_with_decl (fndecl,
6331 "parm types given both in parmlist and separately");
6332 /* Get rid of the erroneous decls; don't keep them on
6333 the list of parms, since they might not be PARM_DECLs. */
6334 for (decl = current_binding_level->names;
6335 decl; decl = TREE_CHAIN (decl))
6336 if (DECL_NAME (decl))
6337 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6338 for (link = current_binding_level->shadowed;
6339 link; link = TREE_CHAIN (link))
6340 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6341 current_binding_level->names = 0;
6342 current_binding_level->shadowed = 0;
6345 specparms = nreverse (specparms);
6346 for (parm = specparms; parm; parm = next)
6348 next = TREE_CHAIN (parm);
6349 if (TREE_CODE (parm) == PARM_DECL)
6351 if (DECL_NAME (parm) == 0)
6352 error_with_decl (parm, "parameter name omitted");
6353 else if (TREE_CODE (TREE_TYPE (parm)) != ERROR_MARK
6354 && VOID_TYPE_P (TREE_TYPE (parm)))
6356 error_with_decl (parm, "parameter `%s' declared void");
6357 /* Change the type to error_mark_node so this parameter
6358 will be ignored by assign_parms. */
6359 TREE_TYPE (parm) = error_mark_node;
6365 /* If we find an enum constant or a type tag,
6366 put it aside for the moment. */
6367 TREE_CHAIN (parm) = 0;
6368 others = chainon (others, parm);
6372 /* Get the decls in their original chain order
6373 and record in the function. */
6374 DECL_ARGUMENTS (fndecl) = getdecls ();
6377 /* If this function takes a variable number of arguments,
6378 add a phony parameter to the end of the parm list,
6379 to represent the position of the first unnamed argument. */
6380 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6383 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6384 /* Let's hope the address of the unnamed parm
6385 won't depend on its type. */
6386 TREE_TYPE (dummy) = integer_type_node;
6387 DECL_ARG_TYPE (dummy) = integer_type_node;
6388 DECL_ARGUMENTS (fndecl) = chainon (DECL_ARGUMENTS (fndecl), dummy);
6392 /* Now pushdecl the enum constants. */
6393 for (parm = others; parm; parm = next)
6395 next = TREE_CHAIN (parm);
6396 if (DECL_NAME (parm) == 0)
6398 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6400 else if (TREE_CODE (parm) != PARM_DECL)
6404 storetags (chainon (parmtags, gettags ()));
6408 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6409 each with a parm name as the TREE_VALUE.
6411 PARMDECLS is a chain of declarations for parameters.
6412 Warning! It can also contain CONST_DECLs which are not parameters
6413 but are names of enumerators of any enum types
6414 declared among the parameters.
6416 First match each formal parameter name with its declaration.
6417 Associate decls with the names and store the decls
6418 into the TREE_PURPOSE slots. */
6420 /* We use DECL_WEAK as a flag to show which parameters have been
6421 seen already since it is not used on PARM_DECL or CONST_DECL. */
6422 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6423 DECL_WEAK (parm) = 0;
6425 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6427 tree tail, found = NULL;
6429 if (TREE_VALUE (parm) == 0)
6431 error_with_decl (fndecl,
6432 "parameter name missing from parameter list");
6433 TREE_PURPOSE (parm) = 0;
6437 /* See if any of the parmdecls specifies this parm by name.
6438 Ignore any enumerator decls. */
6439 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6440 if (DECL_NAME (tail) == TREE_VALUE (parm)
6441 && TREE_CODE (tail) == PARM_DECL)
6447 /* If declaration already marked, we have a duplicate name.
6448 Complain, and don't use this decl twice. */
6449 if (found && DECL_WEAK (found))
6451 error_with_decl (found, "multiple parameters named `%s'");
6455 /* If the declaration says "void", complain and ignore it. */
6456 if (found && VOID_TYPE_P (TREE_TYPE (found)))
6458 error_with_decl (found, "parameter `%s' declared void");
6459 TREE_TYPE (found) = integer_type_node;
6460 DECL_ARG_TYPE (found) = integer_type_node;
6461 layout_decl (found, 0);
6464 /* Traditionally, a parm declared float is actually a double. */
6465 if (found && flag_traditional
6466 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6468 TREE_TYPE (found) = double_type_node;
6469 DECL_ARG_TYPE (found) = double_type_node;
6470 layout_decl (found, 0);
6473 /* If no declaration found, default to int. */
6476 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6478 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6479 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6480 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6482 pedwarn_with_decl (found, "type of `%s' defaults to `int'");
6483 else if (extra_warnings)
6484 warning_with_decl (found, "type of `%s' defaults to `int'");
6488 TREE_PURPOSE (parm) = found;
6490 /* Mark this decl as "already found". */
6491 DECL_WEAK (found) = 1;
6494 /* Put anything which is on the parmdecls chain and which is
6495 not a PARM_DECL onto the list NONPARMS. (The types of
6496 non-parm things which might appear on the list include
6497 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6498 any actual PARM_DECLs not matched with any names. */
6501 for (parm = parmdecls; parm;)
6503 tree next = TREE_CHAIN (parm);
6504 TREE_CHAIN (parm) = 0;
6506 if (TREE_CODE (parm) != PARM_DECL)
6507 nonparms = chainon (nonparms, parm);
6510 /* Complain about args with incomplete types. */
6511 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6513 error_with_decl (parm, "parameter `%s' has incomplete type");
6514 TREE_TYPE (parm) = error_mark_node;
6517 if (! DECL_WEAK (parm))
6519 error_with_decl (parm,
6520 "declaration for parameter `%s' but no such parameter");
6521 /* Pretend the parameter was not missing.
6522 This gets us to a standard state and minimizes
6523 further error messages. */
6525 = chainon (specparms,
6526 tree_cons (parm, NULL_TREE, NULL_TREE));
6533 /* Chain the declarations together in the order of the list of
6534 names. Store that chain in the function decl, replacing the
6537 DECL_ARGUMENTS (fndecl) = 0;
6540 for (last = 0; parm; parm = TREE_CHAIN (parm))
6541 if (TREE_PURPOSE (parm))
6544 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6546 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6547 last = TREE_PURPOSE (parm);
6548 TREE_CHAIN (last) = 0;
6552 /* If there was a previous prototype,
6553 set the DECL_ARG_TYPE of each argument according to
6554 the type previously specified, and report any mismatches. */
6556 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6559 for (parm = DECL_ARGUMENTS (fndecl),
6560 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6561 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6562 != void_type_node));
6563 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6565 if (parm == 0 || type == 0
6566 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6568 error ("number of arguments doesn't match prototype");
6569 error_with_file_and_line (current_function_prototype_file,
6570 current_function_prototype_line,
6571 "prototype declaration");
6574 /* Type for passing arg must be consistent with that
6575 declared for the arg. ISO C says we take the unqualified
6576 type for parameters declared with qualified type. */
6577 if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6578 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
6580 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6581 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6583 /* Adjust argument to match prototype. E.g. a previous
6584 `int foo(float);' prototype causes
6585 `int foo(x) float x; {...}' to be treated like
6586 `int foo(float x) {...}'. This is particularly
6587 useful for argument types like uid_t. */
6588 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6590 if (PROMOTE_PROTOTYPES
6591 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6592 && TYPE_PRECISION (TREE_TYPE (parm))
6593 < TYPE_PRECISION (integer_type_node))
6594 DECL_ARG_TYPE (parm) = integer_type_node;
6598 pedwarn ("promoted argument `%s' doesn't match prototype",
6599 IDENTIFIER_POINTER (DECL_NAME (parm)));
6600 warning_with_file_and_line
6601 (current_function_prototype_file,
6602 current_function_prototype_line,
6603 "prototype declaration");
6606 /* If -traditional, allow `int' argument to match
6607 `unsigned' prototype. */
6608 else if (! (flag_traditional
6609 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6610 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6612 error ("argument `%s' doesn't match prototype",
6613 IDENTIFIER_POINTER (DECL_NAME (parm)));
6614 error_with_file_and_line (current_function_prototype_file,
6615 current_function_prototype_line,
6616 "prototype declaration");
6620 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6623 /* Otherwise, create a prototype that would match. */
6627 tree actual = 0, last = 0, type;
6629 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6631 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6633 TREE_CHAIN (last) = type;
6638 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6640 TREE_CHAIN (last) = type;
6644 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6645 of the type of this function, but we need to avoid having this
6646 affect the types of other similarly-typed functions, so we must
6647 first force the generation of an identical (but separate) type
6648 node for the relevant function type. The new node we create
6649 will be a variant of the main variant of the original function
6652 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6654 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6657 /* Now store the final chain of decls for the arguments
6658 as the decl-chain of the current lexical scope.
6659 Put the enumerators in as well, at the front so that
6660 DECL_ARGUMENTS is not modified. */
6662 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6665 /* Make sure the binding level for the top of the function body
6666 gets a BLOCK if there are any in the function.
6667 Otherwise, the dbx output is wrong. */
6669 keep_next_if_subblocks = 1;
6671 /* ??? This might be an improvement,
6672 but needs to be thought about some more. */
6674 keep_next_level_flag = 1;
6677 /* Write a record describing this function definition to the prototypes
6678 file (if requested). */
6680 gen_aux_info_record (fndecl, 1, 0, prototype);
6682 /* Initialize the RTL code for the function. */
6683 init_function_start (fndecl, input_filename, lineno);
6685 /* Begin the statement tree for this function. */
6686 begin_stmt_tree (&DECL_SAVED_TREE (current_function_decl));
6688 /* If this is a nested function, save away the sizes of any
6689 variable-size types so that we can expand them when generating
6695 DECL_LANG_SPECIFIC (fndecl)->pending_sizes
6696 = nreverse (get_pending_sizes ());
6697 for (t = DECL_LANG_SPECIFIC (fndecl)->pending_sizes;
6700 SAVE_EXPR_CONTEXT (TREE_VALUE (t)) = context;
6703 /* This function is being processed in whole-function mode. */
6704 cfun->x_whole_function_mode_p = 1;
6706 /* Even though we're inside a function body, we still don't want to
6707 call expand_expr to calculate the size of a variable-sized array.
6708 We haven't necessarily assigned RTL to all variables yet, so it's
6709 not safe to try to expand expressions involving them. */
6710 immediate_size_expand = 0;
6711 cfun->x_dont_save_pending_sizes_p = 1;
6714 /* Finish up a function declaration and compile that function
6715 all the way to assembler language output. The free the storage
6716 for the function definition.
6718 This is called after parsing the body of the function definition.
6720 NESTED is nonzero if the function being finished is nested in another. */
6723 finish_function (nested)
6726 tree fndecl = current_function_decl;
6728 /* TREE_READONLY (fndecl) = 1;
6729 This caused &foo to be of type ptr-to-const-function
6730 which then got a warning when stored in a ptr-to-function variable. */
6733 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6735 /* Must mark the RESULT_DECL as being in this function. */
6737 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6739 /* Obey `register' declarations if `setjmp' is called in this fn. */
6740 if (flag_traditional && current_function_calls_setjmp)
6742 setjmp_protect (DECL_INITIAL (fndecl));
6743 setjmp_protect_args ();
6746 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6748 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6749 != integer_type_node)
6751 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6752 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6754 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
6758 #ifdef DEFAULT_MAIN_RETURN
6759 /* Make it so that `main' always returns success by default. */
6760 DEFAULT_MAIN_RETURN;
6763 c_expand_return (integer_zero_node);
6768 finish_fname_decls ();
6770 /* Tie off the statement tree for this function. */
6771 finish_stmt_tree (&DECL_SAVED_TREE (fndecl));
6772 /* Clear out memory we no longer need. */
6773 free_after_parsing (cfun);
6774 /* Since we never call rest_of_compilation, we never clear
6775 CFUN. Do so explicitly. */
6776 free_after_compilation (cfun);
6781 /* Generate RTL for the body of this function. */
6782 c_expand_body (fndecl, nested);
6783 /* Let the error reporting routines know that we're outside a
6784 function. For a nested function, this value is used in
6785 pop_c_function_context and then reset via pop_function_context. */
6786 current_function_decl = NULL;
6790 /* Generate the RTL for the body of FNDECL. If NESTED_P is non-zero,
6791 then we are already in the process of generating RTL for another
6795 c_expand_body (fndecl, nested_p)
6799 int uninlinable = 1;
6801 /* There's no reason to do any of the work here if we're only doing
6802 semantic analysis; this code just generates RTL. */
6803 if (flag_syntax_only)
6806 timevar_push (TV_EXPAND);
6808 if (flag_inline_trees)
6810 /* First, cache whether the current function is inlinable. Some
6811 predicates depend on cfun and current_function_decl to
6812 function completely. */
6813 uninlinable = ! tree_inlinable_function_p (fndecl);
6815 /* Then, inline any functions called in it. */
6816 optimize_inline_calls (fndecl);
6821 /* Make sure that we will evaluate variable-sized types involved
6822 in our function's type. */
6823 expand_pending_sizes (DECL_LANG_SPECIFIC (fndecl)->pending_sizes);
6824 /* Squirrel away our current state. */
6825 push_function_context ();
6828 /* Initialize the RTL code for the function. */
6829 current_function_decl = fndecl;
6830 init_function_start (fndecl, input_filename, DECL_SOURCE_LINE (fndecl));
6832 /* This function is being processed in whole-function mode. */
6833 cfun->x_whole_function_mode_p = 1;
6835 /* Even though we're inside a function body, we still don't want to
6836 call expand_expr to calculate the size of a variable-sized array.
6837 We haven't necessarily assigned RTL to all variables yet, so it's
6838 not safe to try to expand expressions involving them. */
6839 immediate_size_expand = 0;
6840 cfun->x_dont_save_pending_sizes_p = 1;
6842 /* If this is a varargs function, inform function.c. */
6843 if (c_function_varargs)
6846 /* Set up parameters and prepare for return, for the function. */
6847 expand_function_start (fndecl, 0);
6849 /* If this function is `main', emit a call to `__main'
6850 to run global initializers, etc. */
6851 if (DECL_NAME (fndecl)
6852 && MAIN_NAME_P (DECL_NAME (fndecl))
6853 && DECL_CONTEXT (fndecl) == NULL_TREE)
6854 expand_main_function ();
6856 /* Generate the RTL for this function. */
6857 expand_stmt (DECL_SAVED_TREE (fndecl));
6860 /* Allow the body of the function to be garbage collected. */
6861 DECL_SAVED_TREE (fndecl) = NULL_TREE;
6864 /* We hard-wired immediate_size_expand to zero above.
6865 expand_function_end will decrement this variable. So, we set the
6866 variable to one here, so that after the decrement it will remain
6868 immediate_size_expand = 1;
6870 /* Allow language dialects to perform special processing. */
6871 if (lang_expand_function_end)
6872 (*lang_expand_function_end) ();
6874 /* Generate rtl for function exit. */
6875 expand_function_end (input_filename, lineno, 0);
6877 /* If this is a nested function, protect the local variables in the stack
6878 above us from being collected while we're compiling this function. */
6880 ggc_push_context ();
6882 /* Run the optimizers and output the assembler code for this function. */
6883 rest_of_compilation (fndecl);
6885 /* Undo the GC context switch. */
6889 /* With just -W, complain only if function returns both with
6890 and without a value. */
6892 && current_function_returns_value
6893 && current_function_returns_null)
6894 warning ("this function may return with or without a value");
6896 /* If requested, warn about function definitions where the function will
6897 return a value (usually of some struct or union type) which itself will
6898 take up a lot of stack space. */
6900 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6902 tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6904 if (ret_type && TYPE_SIZE_UNIT (ret_type)
6905 && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST
6906 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type),
6909 unsigned int size_as_int
6910 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type));
6912 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0)
6913 warning_with_decl (fndecl,
6914 "size of return value of `%s' is %u bytes",
6917 warning_with_decl (fndecl,
6918 "size of return value of `%s' is larger than %d bytes",
6923 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested_p
6924 && ! flag_inline_trees)
6926 /* Stop pointing to the local nodes about to be freed.
6927 But DECL_INITIAL must remain nonzero so we know this
6928 was an actual function definition.
6929 For a nested function, this is done in pop_c_function_context.
6930 If rest_of_compilation set this to 0, leave it 0. */
6931 if (DECL_INITIAL (fndecl) != 0)
6932 DECL_INITIAL (fndecl) = error_mark_node;
6934 DECL_ARGUMENTS (fndecl) = 0;
6937 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6939 if (targetm.have_ctors_dtors)
6940 (* targetm.asm_out.constructor) (XEXP (DECL_RTL (fndecl), 0),
6941 DEFAULT_INIT_PRIORITY);
6943 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6946 if (DECL_STATIC_DESTRUCTOR (fndecl))
6948 if (targetm.have_ctors_dtors)
6949 (* targetm.asm_out.destructor) (XEXP (DECL_RTL (fndecl), 0),
6950 DEFAULT_INIT_PRIORITY);
6952 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6956 /* Return to the enclosing function. */
6957 pop_function_context ();
6958 timevar_pop (TV_EXPAND);
6961 /* Check the declarations given in a for-loop for satisfying the C99
6964 check_for_loop_decls ()
6970 /* If we get here, declarations have been used in a for loop without
6971 the C99 for loop scope. This doesn't make much sense, so don't
6973 error ("`for' loop initial declaration used outside C99 mode");
6976 /* C99 subclause 6.8.5 paragraph 3:
6978 [#3] The declaration part of a for statement shall only
6979 declare identifiers for objects having storage class auto or
6982 It isn't clear whether, in this sentence, "identifiers" binds to
6983 "shall only declare" or to "objects" - that is, whether all identifiers
6984 declared must be identifiers for objects, or whether the restriction
6985 only applies to those that are. (A question on this in comp.std.c
6986 in November 2000 received no answer.) We implement the strictest
6987 interpretation, to avoid creating an extension which later causes
6990 for (t = gettags (); t; t = TREE_CHAIN (t))
6992 if (TREE_PURPOSE (t) != 0)
6993 error ("`%s %s' declared in `for' loop initial declaration",
6994 (TREE_CODE (TREE_VALUE (t)) == RECORD_TYPE ? "struct"
6995 : TREE_CODE (TREE_VALUE (t)) == UNION_TYPE ? "union"
6997 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6999 for (t = getdecls (); t; t = TREE_CHAIN (t))
7001 if (TREE_CODE (t) != VAR_DECL && DECL_NAME (t))
7002 error_with_decl (t, "declaration of non-variable `%s' in `for' loop initial declaration");
7003 else if (TREE_STATIC (t))
7004 error_with_decl (t, "declaration of static variable `%s' in `for' loop initial declaration");
7005 else if (DECL_EXTERNAL (t))
7006 error_with_decl (t, "declaration of `extern' variable `%s' in `for' loop initial declaration");
7010 /* Save and restore the variables in this file and elsewhere
7011 that keep track of the progress of compilation of the current function.
7012 Used for nested functions. */
7014 struct c_language_function
7016 struct language_function base;
7018 tree shadowed_labels;
7021 int warn_about_return_type;
7023 struct binding_level *binding_level;
7026 /* Save and reinitialize the variables
7027 used during compilation of a C function. */
7030 push_c_function_context (f)
7033 struct c_language_function *p;
7034 p = ((struct c_language_function *)
7035 xmalloc (sizeof (struct c_language_function)));
7036 f->language = (struct language_function *) p;
7038 p->base.x_stmt_tree = c_stmt_tree;
7039 p->base.x_scope_stmt_stack = c_scope_stmt_stack;
7040 p->named_labels = named_labels;
7041 p->shadowed_labels = shadowed_labels;
7042 p->returns_value = current_function_returns_value;
7043 p->returns_null = current_function_returns_null;
7044 p->warn_about_return_type = warn_about_return_type;
7045 p->extern_inline = current_extern_inline;
7046 p->binding_level = current_binding_level;
7049 /* Restore the variables used during compilation of a C function. */
7052 pop_c_function_context (f)
7055 struct c_language_function *p
7056 = (struct c_language_function *) f->language;
7059 /* Bring back all the labels that were shadowed. */
7060 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
7061 if (DECL_NAME (TREE_VALUE (link)) != 0)
7062 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
7063 = TREE_VALUE (link);
7065 if (DECL_SAVED_INSNS (current_function_decl) == 0
7066 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
7068 /* Stop pointing to the local nodes about to be freed. */
7069 /* But DECL_INITIAL must remain nonzero so we know this
7070 was an actual function definition. */
7071 DECL_INITIAL (current_function_decl) = error_mark_node;
7072 DECL_ARGUMENTS (current_function_decl) = 0;
7075 c_stmt_tree = p->base.x_stmt_tree;
7076 c_scope_stmt_stack = p->base.x_scope_stmt_stack;
7077 named_labels = p->named_labels;
7078 shadowed_labels = p->shadowed_labels;
7079 current_function_returns_value = p->returns_value;
7080 current_function_returns_null = p->returns_null;
7081 warn_about_return_type = p->warn_about_return_type;
7082 current_extern_inline = p->extern_inline;
7083 current_binding_level = p->binding_level;
7089 /* Mark the language specific parts of F for GC. */
7092 mark_c_function_context (f)
7095 struct c_language_function *p
7096 = (struct c_language_function *) f->language;
7101 mark_c_language_function (&p->base);
7102 ggc_mark_tree (p->shadowed_labels);
7103 ggc_mark_tree (p->named_labels);
7104 mark_binding_level (&p->binding_level);
7107 /* Copy the DECL_LANG_SEPECIFIC data associated with NODE. */
7110 copy_lang_decl (decl)
7113 struct lang_decl *ld;
7115 if (!DECL_LANG_SPECIFIC (decl))
7118 ld = (struct lang_decl *) ggc_alloc (sizeof (struct lang_decl));
7119 memcpy ((char *) ld, (char *) DECL_LANG_SPECIFIC (decl),
7120 sizeof (struct lang_decl));
7121 DECL_LANG_SPECIFIC (decl) = ld;
7124 /* Mark the language specific bits in T for GC. */
7130 if (TREE_CODE (t) == IDENTIFIER_NODE)
7132 struct lang_identifier *i = (struct lang_identifier *) t;
7133 ggc_mark_tree (i->global_value);
7134 ggc_mark_tree (i->local_value);
7135 ggc_mark_tree (i->label_value);
7136 ggc_mark_tree (i->implicit_decl);
7137 ggc_mark_tree (i->error_locus);
7138 ggc_mark_tree (i->limbo_value);
7140 else if (TYPE_P (t) && TYPE_LANG_SPECIFIC (t))
7141 ggc_mark (TYPE_LANG_SPECIFIC (t));
7142 else if (DECL_P (t) && DECL_LANG_SPECIFIC (t))
7144 ggc_mark (DECL_LANG_SPECIFIC (t));
7145 c_mark_lang_decl (&DECL_LANG_SPECIFIC (t)->base);
7146 ggc_mark_tree (DECL_LANG_SPECIFIC (t)->pending_sizes);
7150 /* The functions below are required for functionality of doing
7151 function at once processing in the C front end. Currently these
7152 functions are not called from anywhere in the C front end, but as
7153 these changes continue, that will change. */
7155 /* Returns non-zero if the current statement is a full expression,
7156 i.e. temporaries created during that statement should be destroyed
7157 at the end of the statement. */
7160 stmts_are_full_exprs_p ()
7165 /* Returns the stmt_tree (if any) to which statements are currently
7166 being added. If there is no active statement-tree, NULL is
7170 current_stmt_tree ()
7172 return &c_stmt_tree;
7175 /* Returns the stack of SCOPE_STMTs for the current function. */
7178 current_scope_stmt_stack ()
7180 return &c_scope_stmt_stack;
7183 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
7187 anon_aggr_type_p (node)
7188 tree node ATTRIBUTE_UNUSED;
7193 /* Dummy function in place of callback used by C++. */
7196 extract_interface_info ()
7200 /* Return a new COMPOUND_STMT, after adding it to the current
7204 c_begin_compound_stmt ()
7208 /* Create the COMPOUND_STMT. */
7209 stmt = add_stmt (build_stmt (COMPOUND_STMT, NULL_TREE));
7214 /* Expand T (a DECL_STMT) if it declares an entity not handled by the
7218 c_expand_decl_stmt (t)
7221 tree decl = DECL_STMT_DECL (t);
7223 /* Expand nested functions. */
7224 if (TREE_CODE (decl) == FUNCTION_DECL
7225 && DECL_CONTEXT (decl) == current_function_decl
7226 && DECL_SAVED_TREE (decl))
7227 c_expand_body (decl, /*nested_p=*/1);
7230 /* Return the IDENTIFIER_GLOBAL_VALUE of T, for use in common code, since
7231 the definition of IDENTIFIER_GLOBAL_VALUE is different for C and C++. */
7234 identifier_global_value (t)
7237 return IDENTIFIER_GLOBAL_VALUE (t);
7240 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
7241 otherwise the name is found in ridpointers from RID_INDEX. */
7244 record_builtin_type (rid_index, name, type)
7251 id = ridpointers[(int) rid_index];
7253 id = get_identifier (name);
7254 pushdecl (build_decl (TYPE_DECL, id, type));
7257 /* Build the void_list_node (void_type_node having been created). */
7259 build_void_list_node ()
7261 tree t = build_tree_list (NULL_TREE, void_type_node);