1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000
3 Free Software Foundation, Inc.
5 This file is part of GNU CC.
7 GNU CC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU CC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
23 /* Process declarations and symbol lookup for C front end.
24 Also constructs types; the standard scalar types at initialization,
25 and structure, union, array and enum types when they are declared. */
27 /* ??? not all decl nodes are given the most useful possible
28 line numbers. For example, the CONST_DECLs for enum values. */
48 extern cpp_reader parse_in;
51 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
53 { NORMAL, /* Ordinary declaration */
54 FUNCDEF, /* Function definition */
55 PARM, /* Declaration of parm before function body */
56 FIELD, /* Declaration inside struct or union */
57 BITFIELD, /* Likewise but with specified width */
58 TYPENAME}; /* Typename (inside cast or sizeof) */
60 /* We let tm.h override the types used here, to handle trivial differences
61 such as the choice of unsigned int or long unsigned int for size_t.
62 When machines start needing nontrivial differences in the size type,
63 it would be best to do something here to figure out automatically
64 from other information what type to use. */
67 #define SIZE_TYPE "long unsigned int"
71 #define PTRDIFF_TYPE "long int"
75 #define WCHAR_TYPE "int"
79 #define WINT_TYPE "unsigned int"
85 /* Nonzero if we have seen an invalid cross reference
86 to a struct, union, or enum, but not yet printed the message. */
88 tree pending_invalid_xref;
89 /* File and line to appear in the eventual error message. */
90 const char *pending_invalid_xref_file;
91 int pending_invalid_xref_line;
93 /* While defining an enum type, this is 1 plus the last enumerator
94 constant value. Note that will do not have to save this or `enum_overflow'
95 around nested function definition since such a definition could only
96 occur in an enum value expression and we don't use these variables in
99 static tree enum_next_value;
101 /* Nonzero means that there was overflow computing enum_next_value. */
103 static int enum_overflow;
105 /* Parsing a function declarator leaves a list of parameter names
106 or a chain or parameter decls here. */
108 static tree last_function_parms;
110 /* Parsing a function declarator leaves here a chain of structure
111 and enum types declared in the parmlist. */
113 static tree last_function_parm_tags;
115 /* After parsing the declarator that starts a function definition,
116 `start_function' puts here the list of parameter names or chain of decls.
117 `store_parm_decls' finds it here. */
119 static tree current_function_parms;
121 /* Similar, for last_function_parm_tags. */
122 static tree current_function_parm_tags;
124 /* Similar, for the file and line that the prototype came from if this is
125 an old-style definition. */
126 static const char *current_function_prototype_file;
127 static int current_function_prototype_line;
129 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
130 that have names. Here so we can clear out their names' definitions
131 at the end of the function. */
133 static tree named_labels;
135 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
137 static tree shadowed_labels;
139 /* Nonzero when store_parm_decls is called indicates a varargs function.
140 Value not meaningful after store_parm_decls. */
142 static int c_function_varargs;
144 /* Set to 0 at beginning of a function definition, set to 1 if
145 a return statement that specifies a return value is seen. */
147 int current_function_returns_value;
149 /* Set to 0 at beginning of a function definition, set to 1 if
150 a return statement with no argument is seen. */
152 int current_function_returns_null;
154 /* Set to nonzero by `grokdeclarator' for a function
155 whose return type is defaulted, if warnings for this are desired. */
157 static int warn_about_return_type;
159 /* Nonzero when starting a function declared `extern inline'. */
161 static int current_extern_inline;
163 /* For each binding contour we allocate a binding_level structure
164 * which records the names defined in that contour.
167 * 1) one for each function definition,
168 * where internal declarations of the parameters appear.
169 * 2) one for each compound statement,
170 * to record its declarations.
172 * The current meaning of a name can be found by searching the levels from
173 * the current one out to the global one.
176 /* Note that the information in the `names' component of the global contour
177 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
181 /* A chain of _DECL nodes for all variables, constants, functions,
182 and typedef types. These are in the reverse of the order supplied.
186 /* A list of structure, union and enum definitions,
187 * for looking up tag names.
188 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
189 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
190 * or ENUMERAL_TYPE node.
194 /* For each level, a list of shadowed outer-level local definitions
195 to be restored when this level is popped.
196 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
197 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
200 /* For each level (except not the global one),
201 a chain of BLOCK nodes for all the levels
202 that were entered and exited one level down. */
205 /* The BLOCK node for this level, if one has been preallocated.
206 If 0, the BLOCK is allocated (if needed) when the level is popped. */
209 /* The binding level which this one is contained in (inherits from). */
210 struct binding_level *level_chain;
212 /* Nonzero for the level that holds the parameters of a function. */
215 /* Nonzero if this level "doesn't exist" for tags. */
216 char tag_transparent;
218 /* Nonzero if sublevels of this level "don't exist" for tags.
219 This is set in the parm level of a function definition
220 while reading the function body, so that the outermost block
221 of the function body will be tag-transparent. */
222 char subblocks_tag_transparent;
224 /* Nonzero means make a BLOCK for this level regardless of all else. */
227 /* Nonzero means make a BLOCK if this level has any subblocks. */
228 char keep_if_subblocks;
230 /* Number of decls in `names' that have incomplete
231 structure or union types. */
234 /* A list of decls giving the (reversed) specified order of parms,
235 not including any forward-decls in the parmlist.
236 This is so we can put the parms in proper order for assign_parms. */
240 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
242 /* The binding level currently in effect. */
244 static struct binding_level *current_binding_level;
246 /* A chain of binding_level structures awaiting reuse. */
248 static struct binding_level *free_binding_level;
250 /* The outermost binding level, for names of file scope.
251 This is created when the compiler is started and exists
252 through the entire run. */
254 static struct binding_level *global_binding_level;
256 /* Binding level structures are initialized by copying this one. */
258 static struct binding_level clear_binding_level
259 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, 0,
262 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
264 static int keep_next_level_flag;
266 /* Nonzero means make a BLOCK for the next level pushed
267 if it has subblocks. */
269 static int keep_next_if_subblocks;
271 /* The chain of outer levels of label scopes.
272 This uses the same data structure used for binding levels,
273 but it works differently: each link in the chain records
274 saved values of named_labels and shadowed_labels for
275 a label binding level outside the current one. */
277 static struct binding_level *label_level_chain;
279 /* Functions called automatically at the beginning and end of execution. */
281 tree static_ctors, static_dtors;
283 /* Forward declarations. */
285 static struct binding_level * make_binding_level PARAMS ((void));
286 static void mark_binding_level PARAMS ((void *));
287 static void clear_limbo_values PARAMS ((tree));
288 static int duplicate_decls PARAMS ((tree, tree, int));
289 static int redeclaration_error_message PARAMS ((tree, tree));
290 static void storedecls PARAMS ((tree));
291 static void storetags PARAMS ((tree));
292 static tree lookup_tag PARAMS ((enum tree_code, tree,
293 struct binding_level *, int));
294 static tree lookup_tag_reverse PARAMS ((tree));
295 static tree grokdeclarator PARAMS ((tree, tree, enum decl_context,
297 static tree grokparms PARAMS ((tree, int));
298 static void layout_array_type PARAMS ((tree));
299 static tree c_make_fname_decl PARAMS ((tree, const char *, int));
301 /* C-specific option variables. */
303 /* Nonzero means allow type mismatches in conditional expressions;
304 just make their values `void'. */
306 int flag_cond_mismatch;
308 /* Nonzero means give `double' the same size as `float'. */
310 int flag_short_double;
312 /* Nonzero means give `wchar_t' the same size as `short'. */
314 int flag_short_wchar;
316 /* Nonzero means don't recognize the keyword `asm'. */
320 /* Nonzero means don't recognize any builtin functions. */
324 /* Nonzero means don't recognize the non-ANSI builtin functions.
327 int flag_no_nonansi_builtin;
329 /* Nonzero means do some things the same way PCC does. */
331 int flag_traditional;
333 /* Nonzero means enable C89 Amendment 1 features, other than digraphs. */
337 /* Nonzero means use the ISO C99 dialect of C. */
341 /* Nonzero means accept digraphs. */
343 int flag_digraphs = 1;
345 /* Nonzero means that we have builtin functions, and main is an int */
349 /* Nonzero means to allow single precision math even if we're generally
350 being traditional. */
351 int flag_allow_single_precision = 0;
353 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
355 int flag_signed_bitfields = 1;
356 int explicit_flag_signed_bitfields = 0;
358 /* Nonzero means warn about use of implicit int. */
360 int warn_implicit_int;
362 /* Nonzero means warn about usage of long long when `-pedantic'. */
364 int warn_long_long = 1;
366 /* Nonzero means message about use of implicit function declarations;
367 1 means warning; 2 means error. */
369 int mesg_implicit_function_declaration = -1;
371 /* Nonzero means give string constants the type `const char *'
372 to get extra warnings from them. These warnings will be too numerous
373 to be useful, except in thoroughly ANSIfied programs. */
375 int flag_const_strings;
377 /* Nonzero means warn about pointer casts that can drop a type qualifier
378 from the pointer target type. */
382 /* Nonzero means warn when casting a function call to a type that does
383 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
384 when there is no previous declaration of sqrt or malloc. */
386 int warn_bad_function_cast;
388 /* Warn about functions which might be candidates for attribute noreturn. */
390 int warn_missing_noreturn;
392 /* Warn about traditional constructs whose meanings changed in ANSI C. */
394 int warn_traditional;
396 /* Nonzero means warn about sizeof(function) or addition/subtraction
397 of function pointers. */
399 int warn_pointer_arith;
401 /* Nonzero means warn for non-prototype function decls
402 or non-prototyped defs without previous prototype. */
404 int warn_strict_prototypes;
406 /* Nonzero means warn for any global function def
407 without separate previous prototype decl. */
409 int warn_missing_prototypes;
411 /* Nonzero means warn for any global function def
412 without separate previous decl. */
414 int warn_missing_declarations;
416 /* Nonzero means warn about multiple (redundant) decls for the same single
417 variable or function. */
419 int warn_redundant_decls = 0;
421 /* Nonzero means warn about extern declarations of objects not at
422 file-scope level and about *all* declarations of functions (whether
423 extern or static) not at file-scope level. Note that we exclude
424 implicit function declarations. To get warnings about those, use
427 int warn_nested_externs = 0;
429 /* Warn about *printf or *scanf format/argument anomalies. */
433 /* Warn about a subscript that has type char. */
435 int warn_char_subscripts = 0;
437 /* Warn if a type conversion is done that might have confusing results. */
441 /* Warn if adding () is suggested. */
443 int warn_parentheses;
445 /* Warn if initializer is not completely bracketed. */
447 int warn_missing_braces;
449 /* Warn if main is suspicious. */
453 /* Warn about #pragma directives that are not recognised. */
455 int warn_unknown_pragmas = 0; /* Tri state variable. */
457 /* Warn about comparison of signed and unsigned values.
458 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
460 int warn_sign_compare = -1;
462 /* Warn about testing equality of floating point numbers. */
464 int warn_float_equal = 0;
466 /* Nonzero means warn about use of multicharacter literals. */
468 int warn_multichar = 1;
470 /* Wrapper since C and C++ expand_expr_stmt are different. */
472 expand_expr_stmt_fn lang_expand_expr_stmt = c_expand_expr_stmt;
474 /* The variant of the C language being processed. */
476 c_language_kind c_language = clk_c;
478 /* Nonzero means `$' can be in an identifier. */
480 #ifndef DOLLARS_IN_IDENTIFIERS
481 #define DOLLARS_IN_IDENTIFIERS 1
483 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
485 /* Decode the string P as a language-specific option for C.
486 Return the number of strings consumed. Should not complain
487 if it does not recognise the option. */
490 c_decode_option (argc, argv)
491 int argc ATTRIBUTE_UNUSED;
494 int strings_processed;
497 strings_processed = cpp_handle_option (&parse_in, argc, argv);
499 strings_processed = 0;
500 #endif /* ! USE_CPPLIB */
502 if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
504 flag_traditional = 1;
505 flag_writable_strings = 1;
508 else if (!strcmp (p, "-fallow-single-precision"))
509 flag_allow_single_precision = 1;
510 else if (!strcmp (p, "-fhosted") || !strcmp (p, "-fno-freestanding"))
515 else if (!strcmp (p, "-ffreestanding") || !strcmp (p, "-fno-hosted"))
519 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
523 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
525 flag_traditional = 0;
526 flag_writable_strings = 0;
529 else if (!strncmp (p, "-std=", 5))
531 /* Select the appropriate language standard. We currently
533 -std=iso9899:1990 same as -ansi
534 -std=iso9899:199409 ISO C as modified in amend. 1
535 -std=iso9899:1999 ISO C 99
536 -std=c89 same as -std=iso9899:1990
537 -std=c99 same as -std=iso9899:1999
538 -std=gnu89 default, iso9899:1990 + gnu extensions
539 -std=gnu99 iso9899:1999 + gnu extensions
541 const char *argstart = &p[5];
543 if (!strcmp (argstart, "iso9899:1990")
544 || !strcmp (argstart, "c89"))
550 flag_traditional = 0;
551 flag_writable_strings = 0;
553 flag_no_nonansi_builtin = 1;
556 else if (!strcmp (argstart, "iso9899:199409"))
560 goto iso_1990_digraphs;
562 else if (!strcmp (argstart, "iso9899:199x")
563 || !strcmp (argstart, "iso9899:1999")
564 || !strcmp (argstart, "c9x")
565 || !strcmp (argstart, "c99"))
567 flag_traditional = 0;
568 flag_writable_strings = 0;
570 flag_no_nonansi_builtin = 1;
575 else if (!strcmp (argstart, "gnu89"))
577 flag_traditional = 0;
578 flag_writable_strings = 0;
580 flag_no_nonansi_builtin = 0;
585 else if (!strcmp (argstart, "gnu9x") || !strcmp (argstart, "gnu99"))
587 flag_traditional = 0;
588 flag_writable_strings = 0;
590 flag_no_nonansi_builtin = 0;
596 error ("unknown C standard `%s'", argstart);
598 else if (!strcmp (p, "-fdollars-in-identifiers"))
599 dollars_in_ident = 1;
600 else if (!strcmp (p, "-fno-dollars-in-identifiers"))
601 dollars_in_ident = 0;
602 else if (!strcmp (p, "-fsigned-char"))
603 flag_signed_char = 1;
604 else if (!strcmp (p, "-funsigned-char"))
605 flag_signed_char = 0;
606 else if (!strcmp (p, "-fno-signed-char"))
607 flag_signed_char = 0;
608 else if (!strcmp (p, "-fno-unsigned-char"))
609 flag_signed_char = 1;
610 else if (!strcmp (p, "-fsigned-bitfields")
611 || !strcmp (p, "-fno-unsigned-bitfields"))
613 flag_signed_bitfields = 1;
614 explicit_flag_signed_bitfields = 1;
616 else if (!strcmp (p, "-funsigned-bitfields")
617 || !strcmp (p, "-fno-signed-bitfields"))
619 flag_signed_bitfields = 0;
620 explicit_flag_signed_bitfields = 1;
622 else if (!strcmp (p, "-fshort-enums"))
623 flag_short_enums = 1;
624 else if (!strcmp (p, "-fno-short-enums"))
625 flag_short_enums = 0;
626 else if (!strcmp (p, "-fshort-wchar"))
627 flag_short_wchar = 1;
628 else if (!strcmp (p, "-fno-short-wchar"))
629 flag_short_wchar = 0;
630 else if (!strcmp (p, "-fcond-mismatch"))
631 flag_cond_mismatch = 1;
632 else if (!strcmp (p, "-fno-cond-mismatch"))
633 flag_cond_mismatch = 0;
634 else if (!strcmp (p, "-fshort-double"))
635 flag_short_double = 1;
636 else if (!strcmp (p, "-fno-short-double"))
637 flag_short_double = 0;
638 else if (!strcmp (p, "-fasm"))
640 else if (!strcmp (p, "-fno-asm"))
642 else if (!strcmp (p, "-fbuiltin"))
644 else if (!strcmp (p, "-fno-builtin"))
646 else if (!strcmp (p, "-ansi"))
648 else if (!strcmp (p, "-Werror-implicit-function-declaration"))
649 mesg_implicit_function_declaration = 2;
650 else if (!strcmp (p, "-Wimplicit-function-declaration"))
651 mesg_implicit_function_declaration = 1;
652 else if (!strcmp (p, "-Wno-implicit-function-declaration"))
653 mesg_implicit_function_declaration = 0;
654 else if (!strcmp (p, "-Wimplicit-int"))
655 warn_implicit_int = 1;
656 else if (!strcmp (p, "-Wno-implicit-int"))
657 warn_implicit_int = 0;
658 else if (!strcmp (p, "-Wimplicit"))
660 warn_implicit_int = 1;
661 if (mesg_implicit_function_declaration != 2)
662 mesg_implicit_function_declaration = 1;
664 else if (!strcmp (p, "-Wno-implicit"))
665 warn_implicit_int = 0, mesg_implicit_function_declaration = 0;
666 else if (!strcmp (p, "-Wlong-long"))
668 else if (!strcmp (p, "-Wno-long-long"))
670 else if (!strcmp (p, "-Wwrite-strings"))
671 flag_const_strings = 1;
672 else if (!strcmp (p, "-Wno-write-strings"))
673 flag_const_strings = 0;
674 else if (!strcmp (p, "-Wcast-qual"))
676 else if (!strcmp (p, "-Wno-cast-qual"))
678 else if (!strcmp (p, "-Wbad-function-cast"))
679 warn_bad_function_cast = 1;
680 else if (!strcmp (p, "-Wno-bad-function-cast"))
681 warn_bad_function_cast = 0;
682 else if (!strcmp (p, "-Wmissing-noreturn"))
683 warn_missing_noreturn = 1;
684 else if (!strcmp (p, "-Wno-missing-noreturn"))
685 warn_missing_noreturn = 0;
686 else if (!strcmp (p, "-Wpointer-arith"))
687 warn_pointer_arith = 1;
688 else if (!strcmp (p, "-Wno-pointer-arith"))
689 warn_pointer_arith = 0;
690 else if (!strcmp (p, "-Wstrict-prototypes"))
691 warn_strict_prototypes = 1;
692 else if (!strcmp (p, "-Wno-strict-prototypes"))
693 warn_strict_prototypes = 0;
694 else if (!strcmp (p, "-Wmissing-prototypes"))
695 warn_missing_prototypes = 1;
696 else if (!strcmp (p, "-Wno-missing-prototypes"))
697 warn_missing_prototypes = 0;
698 else if (!strcmp (p, "-Wmissing-declarations"))
699 warn_missing_declarations = 1;
700 else if (!strcmp (p, "-Wno-missing-declarations"))
701 warn_missing_declarations = 0;
702 else if (!strcmp (p, "-Wredundant-decls"))
703 warn_redundant_decls = 1;
704 else if (!strcmp (p, "-Wno-redundant-decls"))
705 warn_redundant_decls = 0;
706 else if (!strcmp (p, "-Wnested-externs"))
707 warn_nested_externs = 1;
708 else if (!strcmp (p, "-Wno-nested-externs"))
709 warn_nested_externs = 0;
710 else if (!strcmp (p, "-Wtraditional"))
711 warn_traditional = 1;
712 else if (!strcmp (p, "-Wno-traditional"))
713 warn_traditional = 0;
714 else if (!strncmp (p, "-Wformat=", 9))
715 warn_format = atol (p + 9);
716 else if (!strcmp (p, "-Wformat"))
718 else if (!strcmp (p, "-Wno-format"))
720 else if (!strcmp (p, "-Wchar-subscripts"))
721 warn_char_subscripts = 1;
722 else if (!strcmp (p, "-Wno-char-subscripts"))
723 warn_char_subscripts = 0;
724 else if (!strcmp (p, "-Wconversion"))
726 else if (!strcmp (p, "-Wno-conversion"))
728 else if (!strcmp (p, "-Wparentheses"))
729 warn_parentheses = 1;
730 else if (!strcmp (p, "-Wno-parentheses"))
731 warn_parentheses = 0;
732 else if (!strcmp (p, "-Wreturn-type"))
733 warn_return_type = 1;
734 else if (!strcmp (p, "-Wno-return-type"))
735 warn_return_type = 0;
736 else if (!strcmp (p, "-Wcomment"))
737 ; /* cpp handles this one. */
738 else if (!strcmp (p, "-Wno-comment"))
739 ; /* cpp handles this one. */
740 else if (!strcmp (p, "-Wcomments"))
741 ; /* cpp handles this one. */
742 else if (!strcmp (p, "-Wno-comments"))
743 ; /* cpp handles this one. */
744 else if (!strcmp (p, "-Wtrigraphs"))
745 ; /* cpp handles this one. */
746 else if (!strcmp (p, "-Wno-trigraphs"))
747 ; /* cpp handles this one. */
748 else if (!strcmp (p, "-Wundef"))
749 ; /* cpp handles this one. */
750 else if (!strcmp (p, "-Wno-undef"))
751 ; /* cpp handles this one. */
752 else if (!strcmp (p, "-Wimport"))
753 ; /* cpp handles this one. */
754 else if (!strcmp (p, "-Wno-import"))
755 ; /* cpp handles this one. */
756 else if (!strcmp (p, "-Wmissing-braces"))
757 warn_missing_braces = 1;
758 else if (!strcmp (p, "-Wno-missing-braces"))
759 warn_missing_braces = 0;
760 else if (!strcmp (p, "-Wmain"))
762 else if (!strcmp (p, "-Wno-main"))
764 else if (!strcmp (p, "-Wsign-compare"))
765 warn_sign_compare = 1;
766 else if (!strcmp (p, "-Wno-sign-compare"))
767 warn_sign_compare = 0;
768 else if (!strcmp (p, "-Wfloat-equal"))
769 warn_float_equal = 1;
770 else if (!strcmp (p, "-Wno-float-equal"))
771 warn_float_equal = 0;
772 else if (!strcmp (p, "-Wmultichar"))
774 else if (!strcmp (p, "-Wno-multichar"))
776 else if (!strcmp (p, "-Wunknown-pragmas"))
777 /* Set to greater than 1, so that even unknown pragmas in system
778 headers will be warned about. */
779 warn_unknown_pragmas = 2;
780 else if (!strcmp (p, "-Wno-unknown-pragmas"))
781 warn_unknown_pragmas = 0;
782 else if (!strcmp (p, "-Wall"))
784 /* We save the value of warn_uninitialized, since if they put
785 -Wuninitialized on the command line, we need to generate a
786 warning about not using it without also specifying -O. */
787 if (warn_uninitialized != 1)
788 warn_uninitialized = 2;
789 warn_implicit_int = 1;
790 mesg_implicit_function_declaration = 1;
791 warn_return_type = 1;
795 warn_char_subscripts = 1;
796 warn_parentheses = 1;
797 warn_missing_braces = 1;
798 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
799 it off only if it's not explicit. */
801 /* Only warn about unknown pragmas that are not in system headers. */
802 warn_unknown_pragmas = 1;
805 return strings_processed;
810 /* Hooks for print_node. */
813 print_lang_decl (file, node, indent)
814 FILE *file ATTRIBUTE_UNUSED;
815 tree node ATTRIBUTE_UNUSED;
816 int indent ATTRIBUTE_UNUSED;
821 print_lang_type (file, node, indent)
822 FILE *file ATTRIBUTE_UNUSED;
823 tree node ATTRIBUTE_UNUSED;
824 int indent ATTRIBUTE_UNUSED;
829 print_lang_identifier (file, node, indent)
834 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
835 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
836 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
837 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
838 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
839 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
842 /* Hook called at end of compilation to assume 1 elt
843 for a top-level array decl that wasn't complete before. */
846 finish_incomplete_decl (decl)
849 if (TREE_CODE (decl) == VAR_DECL)
851 tree type = TREE_TYPE (decl);
852 if (type != error_mark_node
853 && TREE_CODE (type) == ARRAY_TYPE
854 && TYPE_DOMAIN (type) == 0)
856 if (! DECL_EXTERNAL (decl))
857 warning_with_decl (decl, "array `%s' assumed to have one element");
859 complete_array_type (type, NULL_TREE, 1);
861 layout_decl (decl, 0);
866 /* Create a new `struct binding_level'. */
869 struct binding_level *
870 make_binding_level ()
873 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
876 /* Nonzero if we are currently in the global binding level. */
881 return current_binding_level == global_binding_level;
887 keep_next_level_flag = 1;
890 /* Nonzero if the current level needs to have a BLOCK made. */
895 return ((current_binding_level->keep_if_subblocks
896 && current_binding_level->blocks != 0)
897 || current_binding_level->keep
898 || current_binding_level->names != 0
899 || (current_binding_level->tags != 0
900 && !current_binding_level->tag_transparent));
903 /* Identify this binding level as a level of parameters.
904 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
905 But it turns out there is no way to pass the right value for
906 DEFINITION_FLAG, so we ignore it. */
909 declare_parm_level (definition_flag)
910 int definition_flag ATTRIBUTE_UNUSED;
912 current_binding_level->parm_flag = 1;
915 /* Nonzero if currently making parm declarations. */
920 return current_binding_level->parm_flag;
923 /* Enter a new binding level.
924 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
925 not for that of tags. */
928 pushlevel (tag_transparent)
931 register struct binding_level *newlevel = NULL_BINDING_LEVEL;
933 /* If this is the top level of a function,
934 just make sure that NAMED_LABELS is 0. */
936 if (current_binding_level == global_binding_level)
941 /* Reuse or create a struct for this binding level. */
943 if (free_binding_level)
945 newlevel = free_binding_level;
946 free_binding_level = free_binding_level->level_chain;
950 newlevel = make_binding_level ();
953 /* Add this level to the front of the chain (stack) of levels that
956 *newlevel = clear_binding_level;
957 newlevel->tag_transparent
959 || (current_binding_level
960 ? current_binding_level->subblocks_tag_transparent
962 newlevel->level_chain = current_binding_level;
963 current_binding_level = newlevel;
964 newlevel->keep = keep_next_level_flag;
965 keep_next_level_flag = 0;
966 newlevel->keep_if_subblocks = keep_next_if_subblocks;
967 keep_next_if_subblocks = 0;
970 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
973 clear_limbo_values (block)
978 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
979 if (DECL_NAME (tem) != 0)
980 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
982 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
983 clear_limbo_values (tem);
986 /* Exit a binding level.
987 Pop the level off, and restore the state of the identifier-decl mappings
988 that were in effect when this level was entered.
990 If KEEP is nonzero, this level had explicit declarations, so
991 and create a "block" (a BLOCK node) for the level
992 to record its declarations and subblocks for symbol table output.
994 If FUNCTIONBODY is nonzero, this level is the body of a function,
995 so create a block as if KEEP were set and also clear out all
998 If REVERSE is nonzero, reverse the order of decls before putting
999 them into the BLOCK. */
1002 poplevel (keep, reverse, functionbody)
1008 /* The chain of decls was accumulated in reverse order.
1009 Put it into forward order, just for cleanliness. */
1011 tree tags = current_binding_level->tags;
1012 tree subblocks = current_binding_level->blocks;
1015 int block_previously_created;
1017 keep |= current_binding_level->keep;
1019 /* This warning is turned off because it causes warnings for
1020 declarations like `extern struct foo *x'. */
1022 /* Warn about incomplete structure types in this level. */
1023 for (link = tags; link; link = TREE_CHAIN (link))
1024 if (!COMPLETE_TYPE_P (TREE_VALUE (link)))
1026 tree type = TREE_VALUE (link);
1027 tree type_name = TYPE_NAME (type);
1028 char *id = IDENTIFIER_POINTER (TREE_CODE (type_name) == IDENTIFIER_NODE
1030 : DECL_NAME (type_name));
1031 switch (TREE_CODE (type))
1034 error ("`struct %s' incomplete in scope ending here", id);
1037 error ("`union %s' incomplete in scope ending here", id);
1040 error ("`enum %s' incomplete in scope ending here", id);
1046 /* Get the decls in the order they were written.
1047 Usually current_binding_level->names is in reverse order.
1048 But parameter decls were previously put in forward order. */
1051 current_binding_level->names
1052 = decls = nreverse (current_binding_level->names);
1054 decls = current_binding_level->names;
1056 /* Output any nested inline functions within this block
1057 if they weren't already output. */
1059 for (decl = decls; decl; decl = TREE_CHAIN (decl))
1060 if (TREE_CODE (decl) == FUNCTION_DECL
1061 && ! TREE_ASM_WRITTEN (decl)
1062 && DECL_INITIAL (decl) != 0
1063 && TREE_ADDRESSABLE (decl))
1065 /* If this decl was copied from a file-scope decl
1066 on account of a block-scope extern decl,
1067 propagate TREE_ADDRESSABLE to the file-scope decl.
1069 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1070 true, since then the decl goes through save_for_inline_copying. */
1071 if (DECL_ABSTRACT_ORIGIN (decl) != 0
1072 && DECL_ABSTRACT_ORIGIN (decl) != decl)
1073 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
1074 else if (DECL_SAVED_INSNS (decl) != 0)
1076 push_function_context ();
1077 output_inline_function (decl);
1078 pop_function_context ();
1082 /* If there were any declarations or structure tags in that level,
1083 or if this level is a function body,
1084 create a BLOCK to record them for the life of this function. */
1087 block_previously_created = (current_binding_level->this_block != 0);
1088 if (block_previously_created)
1089 block = current_binding_level->this_block;
1090 else if (keep || functionbody
1091 || (current_binding_level->keep_if_subblocks && subblocks != 0))
1092 block = make_node (BLOCK);
1095 BLOCK_VARS (block) = decls;
1096 BLOCK_SUBBLOCKS (block) = subblocks;
1099 /* In each subblock, record that this is its superior. */
1101 for (link = subblocks; link; link = TREE_CHAIN (link))
1102 BLOCK_SUPERCONTEXT (link) = block;
1104 /* Clear out the meanings of the local variables of this level. */
1106 for (link = decls; link; link = TREE_CHAIN (link))
1108 if (DECL_NAME (link) != 0)
1110 /* If the ident. was used or addressed via a local extern decl,
1111 don't forget that fact. */
1112 if (DECL_EXTERNAL (link))
1114 if (TREE_USED (link))
1115 TREE_USED (DECL_NAME (link)) = 1;
1116 if (TREE_ADDRESSABLE (link))
1117 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1119 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1123 /* Restore all name-meanings of the outer levels
1124 that were shadowed by this level. */
1126 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1127 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1129 /* If the level being exited is the top level of a function,
1130 check over all the labels, and clear out the current
1131 (function local) meanings of their names. */
1135 clear_limbo_values (block);
1137 /* If this is the top level block of a function,
1138 the vars are the function's parameters.
1139 Don't leave them in the BLOCK because they are
1140 found in the FUNCTION_DECL instead. */
1142 BLOCK_VARS (block) = 0;
1144 /* Clear out the definitions of all label names,
1145 since their scopes end here,
1146 and add them to BLOCK_VARS. */
1148 for (link = named_labels; link; link = TREE_CHAIN (link))
1150 register tree label = TREE_VALUE (link);
1152 if (DECL_INITIAL (label) == 0)
1154 error_with_decl (label, "label `%s' used but not defined");
1155 /* Avoid crashing later. */
1156 define_label (input_filename, lineno,
1159 else if (warn_unused_label && !TREE_USED (label))
1160 warning_with_decl (label, "label `%s' defined but not used");
1161 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1163 /* Put the labels into the "variables" of the
1164 top-level block, so debugger can see them. */
1165 TREE_CHAIN (label) = BLOCK_VARS (block);
1166 BLOCK_VARS (block) = label;
1170 /* Pop the current level, and free the structure for reuse. */
1173 register struct binding_level *level = current_binding_level;
1174 current_binding_level = current_binding_level->level_chain;
1176 level->level_chain = free_binding_level;
1177 free_binding_level = level;
1180 /* Dispose of the block that we just made inside some higher level. */
1182 DECL_INITIAL (current_function_decl) = block;
1185 if (!block_previously_created)
1186 current_binding_level->blocks
1187 = chainon (current_binding_level->blocks, block);
1189 /* If we did not make a block for the level just exited,
1190 any blocks made for inner levels
1191 (since they cannot be recorded as subblocks in that level)
1192 must be carried forward so they will later become subblocks
1193 of something else. */
1195 current_binding_level->blocks
1196 = chainon (current_binding_level->blocks, subblocks);
1198 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1199 binding contour so that they point to the appropriate construct, i.e.
1200 either to the current FUNCTION_DECL node, or else to the BLOCK node
1201 we just constructed.
1203 Note that for tagged types whose scope is just the formal parameter
1204 list for some function type specification, we can't properly set
1205 their TYPE_CONTEXTs here, because we don't have a pointer to the
1206 appropriate FUNCTION_TYPE node readily available to us. For those
1207 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1208 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1209 node which will represent the "scope" for these "parameter list local"
1214 for (link = tags; link; link = TREE_CHAIN (link))
1215 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1217 for (link = tags; link; link = TREE_CHAIN (link))
1218 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1221 TREE_USED (block) = 1;
1225 /* Delete the node BLOCK from the current binding level.
1226 This is used for the block inside a stmt expr ({...})
1227 so that the block can be reinserted where appropriate. */
1230 delete_block (block)
1234 if (current_binding_level->blocks == block)
1235 current_binding_level->blocks = TREE_CHAIN (block);
1236 for (t = current_binding_level->blocks; t;)
1238 if (TREE_CHAIN (t) == block)
1239 TREE_CHAIN (t) = TREE_CHAIN (block);
1243 TREE_CHAIN (block) = NULL;
1244 /* Clear TREE_USED which is always set by poplevel.
1245 The flag is set again if insert_block is called. */
1246 TREE_USED (block) = 0;
1249 /* Insert BLOCK at the end of the list of subblocks of the
1250 current binding level. This is used when a BIND_EXPR is expanded,
1251 to handle the BLOCK node inside the BIND_EXPR. */
1254 insert_block (block)
1257 TREE_USED (block) = 1;
1258 current_binding_level->blocks
1259 = chainon (current_binding_level->blocks, block);
1262 /* Set the BLOCK node for the innermost scope
1263 (the one we are currently in). */
1267 register tree block;
1269 current_binding_level->this_block = block;
1275 register struct binding_level *newlevel;
1277 /* Reuse or create a struct for this binding level. */
1279 if (free_binding_level)
1281 newlevel = free_binding_level;
1282 free_binding_level = free_binding_level->level_chain;
1286 newlevel = make_binding_level ();
1289 /* Add this level to the front of the chain (stack) of label levels. */
1291 newlevel->level_chain = label_level_chain;
1292 label_level_chain = newlevel;
1294 newlevel->names = named_labels;
1295 newlevel->shadowed = shadowed_labels;
1297 shadowed_labels = 0;
1303 register struct binding_level *level = label_level_chain;
1306 /* Clear out the definitions of the declared labels in this level.
1307 Leave in the list any ordinary, non-declared labels. */
1308 for (link = named_labels, prev = 0; link;)
1310 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1312 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1314 error_with_decl (TREE_VALUE (link),
1315 "label `%s' used but not defined");
1316 /* Avoid crashing later. */
1317 define_label (input_filename, lineno,
1318 DECL_NAME (TREE_VALUE (link)));
1320 else if (warn_unused_label && !TREE_USED (TREE_VALUE (link)))
1321 warning_with_decl (TREE_VALUE (link),
1322 "label `%s' defined but not used");
1323 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1325 /* Delete this element from the list. */
1326 link = TREE_CHAIN (link);
1328 TREE_CHAIN (prev) = link;
1330 named_labels = link;
1335 link = TREE_CHAIN (link);
1339 /* Bring back all the labels that were shadowed. */
1340 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1341 if (DECL_NAME (TREE_VALUE (link)) != 0)
1342 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1343 = TREE_VALUE (link);
1345 named_labels = chainon (named_labels, level->names);
1346 shadowed_labels = level->shadowed;
1348 /* Pop the current level, and free the structure for reuse. */
1349 label_level_chain = label_level_chain->level_chain;
1350 level->level_chain = free_binding_level;
1351 free_binding_level = level;
1354 /* Push a definition or a declaration of struct, union or enum tag "name".
1355 "type" should be the type node.
1356 We assume that the tag "name" is not already defined.
1358 Note that the definition may really be just a forward reference.
1359 In that case, the TYPE_SIZE will be zero. */
1362 pushtag (name, type)
1365 register struct binding_level *b;
1367 /* Find the proper binding level for this type tag. */
1369 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1374 /* Record the identifier as the type's name if it has none. */
1376 if (TYPE_NAME (type) == 0)
1377 TYPE_NAME (type) = name;
1380 b->tags = tree_cons (name, type, b->tags);
1382 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1383 tagged type we just added to the current binding level. This fake
1384 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1385 to output a representation of a tagged type, and it also gives
1386 us a convenient place to record the "scope start" address for the
1389 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1391 /* An approximation for now, so we can tell this is a function-scope tag.
1392 This will be updated in poplevel. */
1393 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1396 /* Handle when a new declaration NEWDECL
1397 has the same name as an old one OLDDECL
1398 in the same binding contour.
1399 Prints an error message if appropriate.
1401 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1402 Otherwise, return 0.
1404 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1405 and OLDDECL is in an outer binding level and should thus not be changed. */
1408 duplicate_decls (newdecl, olddecl, different_binding_level)
1409 register tree newdecl, olddecl;
1410 int different_binding_level;
1412 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1413 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1414 && DECL_INITIAL (newdecl) != 0);
1415 tree oldtype = TREE_TYPE (olddecl);
1416 tree newtype = TREE_TYPE (newdecl);
1419 if (DECL_P (olddecl))
1420 DECL_MACHINE_ATTRIBUTES (newdecl)
1421 = merge_machine_decl_attributes (olddecl, newdecl);
1423 if (TREE_CODE (newtype) == ERROR_MARK
1424 || TREE_CODE (oldtype) == ERROR_MARK)
1427 /* New decl is completely inconsistent with the old one =>
1428 tell caller to replace the old one.
1429 This is always an error except in the case of shadowing a builtin. */
1430 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1432 if (TREE_CODE (olddecl) == FUNCTION_DECL
1433 && (DECL_BUILT_IN (olddecl)
1434 || DECL_BUILT_IN_NONANSI (olddecl)))
1436 /* If you declare a built-in or predefined function name as static,
1437 the old definition is overridden,
1438 but optionally warn this was a bad choice of name. */
1439 if (!TREE_PUBLIC (newdecl))
1443 else if (DECL_BUILT_IN (olddecl))
1444 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1446 warning_with_decl (newdecl, "shadowing library function `%s'");
1448 /* Likewise, if the built-in is not ansi, then programs can
1449 override it even globally without an error. */
1450 else if (! DECL_BUILT_IN (olddecl))
1451 warning_with_decl (newdecl,
1452 "library function `%s' declared as non-function");
1454 else if (DECL_BUILT_IN_NONANSI (olddecl))
1455 warning_with_decl (newdecl,
1456 "built-in function `%s' declared as non-function");
1458 warning_with_decl (newdecl,
1459 "built-in function `%s' declared as non-function");
1463 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1464 error_with_decl (olddecl, "previous declaration of `%s'");
1470 /* For real parm decl following a forward decl,
1471 return 1 so old decl will be reused. */
1472 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1473 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1476 /* The new declaration is the same kind of object as the old one.
1477 The declarations may partially match. Print warnings if they don't
1478 match enough. Ultimately, copy most of the information from the new
1479 decl to the old one, and keep using the old one. */
1481 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1482 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1483 && DECL_INITIAL (olddecl) == 0)
1484 /* If -traditional, avoid error for redeclaring fcn
1485 after implicit decl. */
1487 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1488 && DECL_BUILT_IN (olddecl))
1490 /* A function declaration for a built-in function. */
1491 if (!TREE_PUBLIC (newdecl))
1493 /* If you declare a built-in function name as static, the
1494 built-in definition is overridden,
1495 but optionally warn this was a bad choice of name. */
1497 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1498 /* Discard the old built-in function. */
1501 else if (!types_match)
1503 /* Accept the return type of the new declaration if same modes. */
1504 tree oldreturntype = TREE_TYPE (oldtype);
1505 tree newreturntype = TREE_TYPE (newtype);
1507 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1509 /* Function types may be shared, so we can't just modify
1510 the return type of olddecl's function type. */
1512 = build_function_type (newreturntype,
1513 TYPE_ARG_TYPES (oldtype));
1515 types_match = comptypes (newtype, trytype);
1519 /* Accept harmless mismatch in first argument type also.
1521 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1522 && TYPE_ARG_TYPES (oldtype) != 0
1523 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1524 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1525 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1526 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1528 /* Function types may be shared, so we can't just modify
1529 the return type of olddecl's function type. */
1531 = build_function_type (TREE_TYPE (oldtype),
1532 tree_cons (NULL_TREE,
1533 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1534 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1536 types_match = comptypes (newtype, trytype);
1540 if (! different_binding_level)
1541 TREE_TYPE (olddecl) = oldtype;
1545 /* If types don't match for a built-in, throw away the built-in. */
1546 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1550 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1551 && DECL_SOURCE_LINE (olddecl) == 0)
1553 /* A function declaration for a predeclared function
1554 that isn't actually built in. */
1555 if (!TREE_PUBLIC (newdecl))
1557 /* If you declare it as static, the
1558 default definition is overridden. */
1561 else if (!types_match)
1563 /* If the types don't match, preserve volatility indication.
1564 Later on, we will discard everything else about the
1565 default declaration. */
1566 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1569 /* Permit char *foo () to match void *foo (...) if not pedantic,
1570 if one of them came from a system header file. */
1571 else if (!types_match
1572 && TREE_CODE (olddecl) == FUNCTION_DECL
1573 && TREE_CODE (newdecl) == FUNCTION_DECL
1574 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1575 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1576 && (DECL_IN_SYSTEM_HEADER (olddecl)
1577 || DECL_IN_SYSTEM_HEADER (newdecl))
1578 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1579 && TYPE_ARG_TYPES (oldtype) == 0
1580 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1581 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1583 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1584 && TYPE_ARG_TYPES (newtype) == 0
1585 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1586 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1589 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1590 /* Make sure we keep void * as ret type, not char *. */
1591 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1592 TREE_TYPE (newdecl) = newtype = oldtype;
1594 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1595 we will come back here again. */
1596 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1598 else if (!types_match
1599 /* Permit char *foo (int, ...); followed by char *foo ();
1601 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1603 /* Return types must still match. */
1604 && comptypes (TREE_TYPE (oldtype),
1605 TREE_TYPE (newtype))
1606 && TYPE_ARG_TYPES (newtype) == 0))
1608 error_with_decl (newdecl, "conflicting types for `%s'");
1609 /* Check for function type mismatch
1610 involving an empty arglist vs a nonempty one. */
1611 if (TREE_CODE (olddecl) == FUNCTION_DECL
1612 && comptypes (TREE_TYPE (oldtype),
1613 TREE_TYPE (newtype))
1614 && ((TYPE_ARG_TYPES (oldtype) == 0
1615 && DECL_INITIAL (olddecl) == 0)
1617 (TYPE_ARG_TYPES (newtype) == 0
1618 && DECL_INITIAL (newdecl) == 0)))
1620 /* Classify the problem further. */
1621 register tree t = TYPE_ARG_TYPES (oldtype);
1623 t = TYPE_ARG_TYPES (newtype);
1624 for (; t; t = TREE_CHAIN (t))
1626 register tree type = TREE_VALUE (t);
1628 if (TREE_CHAIN (t) == 0
1629 && TYPE_MAIN_VARIANT (type) != void_type_node)
1631 error ("A parameter list with an ellipsis can't match an empty parameter name list declaration.");
1635 if (simple_type_promotes_to (type) != NULL_TREE)
1637 error ("An argument type that has a default promotion can't match an empty parameter name list declaration.");
1642 error_with_decl (olddecl, "previous declaration of `%s'");
1646 errmsg = redeclaration_error_message (newdecl, olddecl);
1652 error_with_decl (newdecl, "redefinition of `%s'");
1655 error_with_decl (newdecl, "redeclaration of `%s'");
1658 error_with_decl (newdecl, "conflicting declarations of `%s'");
1664 error_with_decl (olddecl,
1665 ((DECL_INITIAL (olddecl)
1666 && current_binding_level == global_binding_level)
1667 ? "`%s' previously defined here"
1668 : "`%s' previously declared here"));
1670 else if (TREE_CODE (newdecl) == TYPE_DECL
1671 && (DECL_IN_SYSTEM_HEADER (olddecl)
1672 || DECL_IN_SYSTEM_HEADER (newdecl)))
1674 warning_with_decl (newdecl, "redefinition of `%s'");
1677 ((DECL_INITIAL (olddecl)
1678 && current_binding_level == global_binding_level)
1679 ? "`%s' previously defined here"
1680 : "`%s' previously declared here"));
1682 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1683 && DECL_INITIAL (olddecl) != 0
1684 && TYPE_ARG_TYPES (oldtype) == 0
1685 && TYPE_ARG_TYPES (newtype) != 0
1686 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1688 register tree type, parm;
1690 /* Prototype decl follows defn w/o prototype. */
1692 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1693 type = TYPE_ARG_TYPES (newtype),
1696 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1698 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1699 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1701 warning_with_decl (newdecl, "prototype for `%s' follows");
1702 warning_with_decl (olddecl, "non-prototype definition here");
1705 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1706 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1708 error_with_decl (newdecl, "prototype for `%s' follows and number of arguments doesn't match");
1709 error_with_decl (olddecl, "non-prototype definition here");
1713 /* Type for passing arg must be consistent
1714 with that declared for the arg. */
1715 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1716 /* If -traditional, allow `unsigned int' instead of `int'
1717 in the prototype. */
1718 && (! (flag_traditional
1719 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1720 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1722 error_with_decl (newdecl,
1723 "prototype for `%s' follows and argument %d doesn't match",
1725 error_with_decl (olddecl, "non-prototype definition here");
1731 /* Warn about mismatches in various flags. */
1734 /* Warn if function is now inline
1735 but was previously declared not inline and has been called. */
1736 if (TREE_CODE (olddecl) == FUNCTION_DECL
1737 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1738 && TREE_USED (olddecl))
1739 warning_with_decl (newdecl,
1740 "`%s' declared inline after being called");
1741 if (TREE_CODE (olddecl) == FUNCTION_DECL
1742 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1743 && DECL_INITIAL (olddecl) != 0)
1744 warning_with_decl (newdecl,
1745 "`%s' declared inline after its definition");
1747 /* If pedantic, warn when static declaration follows a non-static
1748 declaration. Otherwise, do so only for functions. */
1749 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1750 && TREE_PUBLIC (olddecl)
1751 && !TREE_PUBLIC (newdecl))
1752 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1754 /* If warn_traditional, warn when a non-static function
1755 declaration follows a static one. */
1756 if (warn_traditional
1757 && TREE_CODE (olddecl) == FUNCTION_DECL
1758 && !TREE_PUBLIC (olddecl)
1759 && TREE_PUBLIC (newdecl))
1760 warning_with_decl (newdecl, "non-static declaration for `%s' follows static");
1762 /* Warn when const declaration follows a non-const
1763 declaration, but not for functions. */
1764 if (TREE_CODE (olddecl) != FUNCTION_DECL
1765 && !TREE_READONLY (olddecl)
1766 && TREE_READONLY (newdecl))
1767 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1768 /* These bits are logically part of the type, for variables.
1769 But not for functions
1770 (where qualifiers are not valid ANSI anyway). */
1771 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1772 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1773 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1774 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1778 /* Optionally warn about more than one declaration for the same name. */
1779 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1780 /* Don't warn about a function declaration
1781 followed by a definition. */
1782 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1783 && DECL_INITIAL (olddecl) == 0)
1784 /* Don't warn about extern decl followed by (tentative) definition. */
1785 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1787 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1788 warning_with_decl (olddecl, "previous declaration of `%s'");
1791 /* Copy all the DECL_... slots specified in the new decl
1792 except for any that we copy here from the old type.
1794 Past this point, we don't change OLDTYPE and NEWTYPE
1795 even if we change the types of NEWDECL and OLDDECL. */
1799 /* When copying info to olddecl, we store into write_olddecl
1800 instead. This allows us to avoid modifying olddecl when
1801 different_binding_level is true. */
1802 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1804 /* Merge the data types specified in the two decls. */
1805 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1807 if (different_binding_level)
1809 = build_type_attribute_variant
1811 merge_attributes (TYPE_ATTRIBUTES (newtype),
1812 TYPE_ATTRIBUTES (oldtype)));
1815 = TREE_TYPE (olddecl)
1816 = common_type (newtype, oldtype);
1819 /* Lay the type out, unless already done. */
1820 if (oldtype != TREE_TYPE (newdecl))
1822 if (TREE_TYPE (newdecl) != error_mark_node)
1823 layout_type (TREE_TYPE (newdecl));
1824 if (TREE_CODE (newdecl) != FUNCTION_DECL
1825 && TREE_CODE (newdecl) != TYPE_DECL
1826 && TREE_CODE (newdecl) != CONST_DECL)
1827 layout_decl (newdecl, 0);
1831 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1832 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1833 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1834 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1835 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1836 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1838 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1839 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1843 /* Keep the old rtl since we can safely use it. */
1844 DECL_RTL (newdecl) = DECL_RTL (olddecl);
1846 /* Merge the type qualifiers. */
1847 if (TREE_CODE (olddecl) == FUNCTION_DECL
1848 && DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1849 && ! TREE_THIS_VOLATILE (newdecl))
1850 TREE_THIS_VOLATILE (write_olddecl) = 0;
1852 if (TREE_READONLY (newdecl))
1853 TREE_READONLY (write_olddecl) = 1;
1855 if (TREE_THIS_VOLATILE (newdecl))
1857 TREE_THIS_VOLATILE (write_olddecl) = 1;
1858 if (TREE_CODE (newdecl) == VAR_DECL
1859 /* If an automatic variable is re-declared in the same
1860 function scope, but the old declaration was not
1861 volatile, make_var_volatile() would crash because the
1862 variable would have been assigned to a pseudo, not a
1863 MEM. Since this duplicate declaration is invalid
1864 anyway, we just skip the call. */
1866 make_var_volatile (newdecl);
1869 /* Keep source location of definition rather than declaration. */
1870 /* When called with different_binding_level set, keep the old
1871 information so that meaningful diagnostics can be given. */
1872 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1873 && ! different_binding_level)
1875 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1876 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1879 /* Merge the unused-warning information. */
1880 if (DECL_IN_SYSTEM_HEADER (olddecl))
1881 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1882 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1883 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1885 /* Merge the initialization information. */
1886 /* When called with different_binding_level set, don't copy over
1887 DECL_INITIAL, so that we don't accidentally change function
1888 declarations into function definitions. */
1889 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1890 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1892 /* Merge the section attribute.
1893 We want to issue an error if the sections conflict but that must be
1894 done later in decl_attributes since we are called before attributes
1896 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1897 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1899 /* Copy the assembler name.
1900 Currently, it can only be defined in the prototype. */
1901 DECL_ASSEMBLER_NAME (newdecl) = DECL_ASSEMBLER_NAME (olddecl);
1903 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1905 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1906 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1908 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1909 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1910 DECL_NO_CHECK_MEMORY_USAGE (newdecl)
1911 |= DECL_NO_CHECK_MEMORY_USAGE (olddecl);
1912 DECL_NO_LIMIT_STACK (newdecl)
1913 |= DECL_NO_LIMIT_STACK (olddecl);
1916 /* If cannot merge, then use the new type and qualifiers,
1917 and don't preserve the old rtl. */
1918 else if (! different_binding_level)
1920 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1921 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1922 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1923 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1926 /* Merge the storage class information. */
1927 DECL_WEAK (newdecl) |= DECL_WEAK (olddecl);
1928 /* For functions, static overrides non-static. */
1929 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1931 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1932 /* This is since we don't automatically
1933 copy the attributes of NEWDECL into OLDDECL. */
1934 /* No need to worry about different_binding_level here because
1935 then TREE_PUBLIC (newdecl) was true. */
1936 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1937 /* If this clears `static', clear it in the identifier too. */
1938 if (! TREE_PUBLIC (olddecl))
1939 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1941 if (DECL_EXTERNAL (newdecl))
1943 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1944 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1945 /* An extern decl does not override previous storage class. */
1946 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1947 if (! DECL_EXTERNAL (newdecl))
1948 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1952 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1953 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1956 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1958 /* If either decl says `inline', this fn is inline,
1959 unless its definition was passed already. */
1960 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
1961 DECL_INLINE (olddecl) = 1;
1963 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1965 if (DECL_BUILT_IN (olddecl))
1967 /* Get rid of any built-in function if new arg types don't match it
1968 or if we have a function definition. */
1969 if (! types_match || new_is_definition)
1971 if (! different_binding_level)
1973 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1974 DECL_BUILT_IN_CLASS (olddecl) = NOT_BUILT_IN;
1979 /* If redeclaring a builtin function, and not a definition,
1980 it stays built in. */
1981 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1982 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1985 /* Also preserve various other info from the definition. */
1986 else if (! new_is_definition)
1987 DECL_FRAME_SIZE (newdecl) = DECL_FRAME_SIZE (olddecl);
1988 if (! new_is_definition)
1990 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1991 /* When called with different_binding_level set, don't copy over
1992 DECL_INITIAL, so that we don't accidentally change function
1993 declarations into function definitions. */
1994 if (! different_binding_level)
1995 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1996 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
1997 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1998 if (DECL_INLINE (newdecl))
1999 DECL_ABSTRACT_ORIGIN (newdecl) = DECL_ABSTRACT_ORIGIN (olddecl);
2002 if (different_binding_level)
2004 /* Don't output a duplicate symbol or debugging information for this
2007 Do not set TREE_ASM_WRITTEN for a FUNCTION_DECL since we may actually
2008 just have two declarations without a definition. VAR_DECLs may need
2009 the same treatment, I'm not sure. */
2010 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2011 DECL_IGNORED_P (newdecl) = 1;
2013 TREE_ASM_WRITTEN (newdecl) = DECL_IGNORED_P (newdecl) = 1;
2017 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2018 But preserve OLDDECL's DECL_UID. */
2020 register unsigned olddecl_uid = DECL_UID (olddecl);
2022 bcopy ((char *) newdecl + sizeof (struct tree_common),
2023 (char *) olddecl + sizeof (struct tree_common),
2024 sizeof (struct tree_decl) - sizeof (struct tree_common));
2025 DECL_UID (olddecl) = olddecl_uid;
2028 /* NEWDECL contains the merged attribute lists.
2029 Update OLDDECL to be the same. */
2030 DECL_MACHINE_ATTRIBUTES (olddecl) = DECL_MACHINE_ATTRIBUTES (newdecl);
2035 /* Record a decl-node X as belonging to the current lexical scope.
2036 Check for errors (such as an incompatible declaration for the same
2037 name already seen in the same scope).
2039 Returns either X or an old decl for the same name.
2040 If an old decl is returned, it may have been smashed
2041 to agree with what X says. */
2048 register tree name = DECL_NAME (x);
2049 register struct binding_level *b = current_binding_level;
2051 DECL_CONTEXT (x) = current_function_decl;
2052 /* A local extern declaration for a function doesn't constitute nesting.
2053 A local auto declaration does, since it's a forward decl
2054 for a nested function coming later. */
2055 if (TREE_CODE (x) == FUNCTION_DECL && DECL_INITIAL (x) == 0
2056 && DECL_EXTERNAL (x))
2057 DECL_CONTEXT (x) = 0;
2059 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
2060 && x != IDENTIFIER_IMPLICIT_DECL (name)
2061 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
2062 && !DECL_IN_SYSTEM_HEADER (x))
2063 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
2069 int different_binding_level = 0;
2071 t = lookup_name_current_level (name);
2072 /* Don't type check externs here when -traditional. This is so that
2073 code with conflicting declarations inside blocks will get warnings
2074 not errors. X11 for instance depends on this. */
2075 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
2077 t = IDENTIFIER_GLOBAL_VALUE (name);
2078 /* Type decls at global scope don't conflict with externs declared
2079 inside lexical blocks. */
2080 if (t && TREE_CODE (t) == TYPE_DECL)
2082 different_binding_level = 1;
2084 if (t != 0 && t == error_mark_node)
2085 /* error_mark_node is 0 for a while during initialization! */
2088 error_with_decl (x, "`%s' used prior to declaration");
2093 file = DECL_SOURCE_FILE (t);
2094 line = DECL_SOURCE_LINE (t);
2097 /* If this decl is `static' and an implicit decl was seen previously,
2098 warn. But don't complain if -traditional,
2099 since traditional compilers don't complain. */
2100 if (! flag_traditional && TREE_PUBLIC (name)
2101 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2102 sets this for all functions. */
2103 && ! TREE_PUBLIC (x)
2104 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2105 /* We used to warn also for explicit extern followed by static,
2106 but sometimes you need to do it that way. */
2107 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2109 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2110 IDENTIFIER_POINTER (name));
2111 pedwarn_with_file_and_line
2112 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2113 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2114 "previous declaration of `%s'",
2115 IDENTIFIER_POINTER (name));
2116 TREE_THIS_VOLATILE (name) = 1;
2119 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2121 if (TREE_CODE (t) == PARM_DECL)
2123 /* Don't allow more than one "real" duplicate
2124 of a forward parm decl. */
2125 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2131 /* If we are processing a typedef statement, generate a whole new
2132 ..._TYPE node (which will be just an variant of the existing
2133 ..._TYPE node with identical properties) and then install the
2134 TYPE_DECL node generated to represent the typedef name as the
2135 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2137 The whole point here is to end up with a situation where each
2138 and every ..._TYPE node the compiler creates will be uniquely
2139 associated with AT MOST one node representing a typedef name.
2140 This way, even though the compiler substitutes corresponding
2141 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2142 early on, later parts of the compiler can always do the reverse
2143 translation and get back the corresponding typedef name. For
2146 typedef struct S MY_TYPE;
2149 Later parts of the compiler might only know that `object' was of
2150 type `struct S' if it were not for code just below. With this
2151 code however, later parts of the compiler see something like:
2153 struct S' == struct S
2154 typedef struct S' MY_TYPE;
2157 And they can then deduce (from the node for type struct S') that
2158 the original object declaration was:
2162 Being able to do this is important for proper support of protoize,
2163 and also for generating precise symbolic debugging information
2164 which takes full account of the programmer's (typedef) vocabulary.
2166 Obviously, we don't want to generate a duplicate ..._TYPE node if
2167 the TYPE_DECL node that we are now processing really represents a
2168 standard built-in type.
2170 Since all standard types are effectively declared at line zero
2171 in the source file, we can easily check to see if we are working
2172 on a standard type by checking the current value of lineno. */
2174 if (TREE_CODE (x) == TYPE_DECL)
2176 if (DECL_SOURCE_LINE (x) == 0)
2178 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2179 TYPE_NAME (TREE_TYPE (x)) = x;
2181 else if (TREE_TYPE (x) != error_mark_node
2182 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2184 tree tt = TREE_TYPE (x);
2185 DECL_ORIGINAL_TYPE (x) = tt;
2186 tt = build_type_copy (tt);
2188 TREE_USED (tt) = TREE_USED (x);
2193 /* Multiple external decls of the same identifier ought to match.
2194 Check against both global declarations (when traditional) and out of
2195 scope (limbo) block level declarations.
2197 We get warnings about inline functions where they are defined.
2198 Avoid duplicate warnings where they are used. */
2200 && ! (TREE_CODE (x) == FUNCTION_DECL && DECL_INLINE (x)))
2204 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2205 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2206 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2207 decl = IDENTIFIER_GLOBAL_VALUE (name);
2208 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2209 /* Decls in limbo are always extern, so no need to check that. */
2210 decl = IDENTIFIER_LIMBO_VALUE (name);
2214 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2215 /* If old decl is built-in, we already warned if we should. */
2216 && !DECL_BUILT_IN (decl))
2218 pedwarn_with_decl (x,
2219 "type mismatch with previous external decl");
2220 pedwarn_with_decl (decl, "previous external decl of `%s'");
2224 /* If a function has had an implicit declaration, and then is defined,
2225 make sure they are compatible. */
2227 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2228 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2229 && TREE_CODE (x) == FUNCTION_DECL
2230 && ! comptypes (TREE_TYPE (x),
2231 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2233 warning_with_decl (x, "type mismatch with previous implicit declaration");
2234 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2235 "previous implicit declaration of `%s'");
2238 /* In PCC-compatibility mode, extern decls of vars with no current decl
2239 take effect at top level no matter where they are. */
2240 if (flag_traditional && DECL_EXTERNAL (x)
2241 && lookup_name (name) == 0)
2243 tree type = TREE_TYPE (x);
2245 /* But don't do this if the type contains temporary nodes. */
2248 if (type == error_mark_node)
2250 if (TYPE_CONTEXT (type))
2252 warning_with_decl (x, "type of external `%s' is not global");
2253 /* By exiting the loop early, we leave TYPE nonzero,
2254 and thus prevent globalization of the decl. */
2257 else if (TREE_CODE (type) == FUNCTION_TYPE
2258 && TYPE_ARG_TYPES (type) != 0)
2259 /* The types might not be truly local,
2260 but the list of arg types certainly is temporary.
2261 Since prototypes are nontraditional,
2262 ok not to do the traditional thing. */
2264 type = TREE_TYPE (type);
2268 b = global_binding_level;
2271 /* This name is new in its binding level.
2272 Install the new declaration and return it. */
2273 if (b == global_binding_level)
2275 /* Install a global value. */
2277 /* If the first global decl has external linkage,
2278 warn if we later see static one. */
2279 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2280 TREE_PUBLIC (name) = 1;
2282 IDENTIFIER_GLOBAL_VALUE (name) = x;
2284 /* We no longer care about any previous block level declarations. */
2285 IDENTIFIER_LIMBO_VALUE (name) = 0;
2287 /* Don't forget if the function was used via an implicit decl. */
2288 if (IDENTIFIER_IMPLICIT_DECL (name)
2289 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2290 TREE_USED (x) = 1, TREE_USED (name) = 1;
2292 /* Don't forget if its address was taken in that way. */
2293 if (IDENTIFIER_IMPLICIT_DECL (name)
2294 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2295 TREE_ADDRESSABLE (x) = 1;
2297 /* Warn about mismatches against previous implicit decl. */
2298 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2299 /* If this real decl matches the implicit, don't complain. */
2300 && ! (TREE_CODE (x) == FUNCTION_DECL
2301 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2302 == integer_type_node)))
2303 pedwarn ("`%s' was previously implicitly declared to return `int'",
2304 IDENTIFIER_POINTER (name));
2306 /* If this decl is `static' and an `extern' was seen previously,
2307 that is erroneous. */
2308 if (TREE_PUBLIC (name)
2309 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2311 /* Okay to redeclare an ANSI built-in as static. */
2312 if (t != 0 && DECL_BUILT_IN (t))
2314 /* Okay to declare a non-ANSI built-in as anything. */
2315 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2317 /* Okay to have global type decl after an earlier extern
2318 declaration inside a lexical block. */
2319 else if (TREE_CODE (x) == TYPE_DECL)
2321 else if (IDENTIFIER_IMPLICIT_DECL (name))
2323 if (! TREE_THIS_VOLATILE (name))
2324 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2325 IDENTIFIER_POINTER (name));
2328 pedwarn ("`%s' was declared `extern' and later `static'",
2329 IDENTIFIER_POINTER (name));
2334 /* Here to install a non-global value. */
2335 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2336 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2338 IDENTIFIER_LOCAL_VALUE (name) = x;
2340 /* If this is an extern function declaration, see if we
2341 have a global definition or declaration for the function. */
2344 && TREE_CODE (x) == FUNCTION_DECL
2345 && TREE_CODE (oldglobal) == FUNCTION_DECL
2346 && DECL_EXTERNAL (x) && ! DECL_INLINE (x))
2348 /* We have one. Their types must agree. */
2349 if (! comptypes (TREE_TYPE (x),
2350 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2351 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2354 /* Inner extern decl is inline if global one is.
2355 Copy enough to really inline it. */
2356 if (DECL_INLINE (oldglobal))
2358 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2359 DECL_INITIAL (x) = (current_function_decl == oldglobal
2360 ? 0 : DECL_INITIAL (oldglobal));
2361 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2362 DECL_FRAME_SIZE (x) = DECL_FRAME_SIZE (oldglobal);
2363 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2364 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2365 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2366 DECL_ABSTRACT_ORIGIN (x) = DECL_ORIGIN (oldglobal);
2368 /* Inner extern decl is built-in if global one is. */
2369 if (DECL_BUILT_IN (oldglobal))
2371 DECL_BUILT_IN_CLASS (x) = DECL_BUILT_IN_CLASS (oldglobal);
2372 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2374 /* Keep the arg types from a file-scope fcn defn. */
2375 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2376 && DECL_INITIAL (oldglobal)
2377 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2378 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2382 #if 0 /* This case is probably sometimes the right thing to do. */
2383 /* If we have a local external declaration,
2384 then any file-scope declaration should not
2385 have been static. */
2386 if (oldlocal == 0 && oldglobal != 0
2387 && !TREE_PUBLIC (oldglobal)
2388 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2389 warning ("`%s' locally external but globally static",
2390 IDENTIFIER_POINTER (name));
2393 /* If we have a local external declaration,
2394 and no file-scope declaration has yet been seen,
2395 then if we later have a file-scope decl it must not be static. */
2397 && DECL_EXTERNAL (x)
2401 TREE_PUBLIC (name) = 1;
2403 /* Save this decl, so that we can do type checking against
2404 other decls after it falls out of scope.
2406 Only save it once. This prevents temporary decls created in
2407 expand_inline_function from being used here, since this
2408 will have been set when the inline function was parsed.
2409 It also helps give slightly better warnings. */
2410 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2411 IDENTIFIER_LIMBO_VALUE (name) = x;
2414 /* Warn if shadowing an argument at the top level of the body. */
2415 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2416 /* This warning doesn't apply to the parms of a nested fcn. */
2417 && ! current_binding_level->parm_flag
2418 /* Check that this is one level down from the parms. */
2419 && current_binding_level->level_chain->parm_flag
2420 /* Check that the decl being shadowed
2421 comes from the parm level, one level up. */
2422 && chain_member (oldlocal, current_binding_level->level_chain->names))
2424 if (TREE_CODE (oldlocal) == PARM_DECL)
2425 pedwarn ("declaration of `%s' shadows a parameter",
2426 IDENTIFIER_POINTER (name));
2428 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2429 IDENTIFIER_POINTER (name));
2432 /* Maybe warn if shadowing something else. */
2433 else if (warn_shadow && !DECL_EXTERNAL (x)
2434 /* No shadow warnings for internally generated vars. */
2435 && DECL_SOURCE_LINE (x) != 0
2436 /* No shadow warnings for vars made for inlining. */
2437 && ! DECL_FROM_INLINE (x))
2439 char *id = IDENTIFIER_POINTER (name);
2441 if (TREE_CODE (x) == PARM_DECL
2442 && current_binding_level->level_chain->parm_flag)
2443 /* Don't warn about the parm names in function declarator
2444 within a function declarator.
2445 It would be nice to avoid warning in any function
2446 declarator in a declaration, as opposed to a definition,
2447 but there is no way to tell it's not a definition. */
2449 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2450 warning ("declaration of `%s' shadows a parameter", id);
2451 else if (oldlocal != 0)
2452 warning ("declaration of `%s' shadows previous local", id);
2453 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2454 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2455 warning ("declaration of `%s' shadows global declaration", id);
2458 /* If storing a local value, there may already be one (inherited).
2459 If so, record it for restoration when this binding level ends. */
2461 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2464 /* Keep count of variables in this level with incomplete type.
2465 If the input is erroneous, we can have error_mark in the type
2466 slot (e.g. "f(void a, ...)") - that doesn't count as an
2468 if (TREE_TYPE (x) != error_mark_node
2469 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2473 /* Put decls on list in reverse order.
2474 We will reverse them later if necessary. */
2475 TREE_CHAIN (x) = b->names;
2481 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2484 pushdecl_top_level (x)
2488 register struct binding_level *b = current_binding_level;
2490 current_binding_level = global_binding_level;
2492 current_binding_level = b;
2496 /* Generate an implicit declaration for identifier FUNCTIONID
2497 as a function of type int (). Print a warning if appropriate. */
2500 implicitly_declare (functionid)
2504 int traditional_warning = 0;
2505 /* Only one "implicit declaration" warning per identifier. */
2506 int implicit_warning;
2508 /* We used to reuse an old implicit decl here,
2509 but this loses with inline functions because it can clobber
2510 the saved decl chains. */
2511 /* if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2512 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2514 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2516 /* Warn of implicit decl following explicit local extern decl.
2517 This is probably a program designed for traditional C. */
2518 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2519 traditional_warning = 1;
2521 /* Warn once of an implicit declaration. */
2522 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2524 DECL_EXTERNAL (decl) = 1;
2525 TREE_PUBLIC (decl) = 1;
2527 /* Record that we have an implicit decl and this is it. */
2528 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2530 /* ANSI standard says implicit declarations are in the innermost block.
2531 So we record the decl in the standard fashion.
2532 If flag_traditional is set, pushdecl does it top-level. */
2535 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2536 maybe_objc_check_decl (decl);
2538 rest_of_decl_compilation (decl, NULL_PTR, 0, 0);
2540 if (implicit_warning)
2541 implicit_decl_warning (functionid);
2542 else if (warn_traditional && traditional_warning)
2543 warning ("function `%s' was previously declared within a block",
2544 IDENTIFIER_POINTER (functionid));
2546 /* Write a record describing this implicit function declaration to the
2547 prototypes file (if requested). */
2549 gen_aux_info_record (decl, 0, 1, 0);
2555 implicit_decl_warning (id)
2558 char *name = IDENTIFIER_POINTER (id);
2559 if (mesg_implicit_function_declaration == 2)
2560 error ("implicit declaration of function `%s'", name);
2561 else if (mesg_implicit_function_declaration == 1)
2562 warning ("implicit declaration of function `%s'", name);
2565 /* Return zero if the declaration NEWDECL is valid
2566 when the declaration OLDDECL (assumed to be for the same name)
2567 has already been seen.
2568 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
2569 and 3 if it is a conflicting declaration. */
2572 redeclaration_error_message (newdecl, olddecl)
2573 tree newdecl, olddecl;
2575 if (TREE_CODE (newdecl) == TYPE_DECL)
2577 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2579 /* pushdecl creates distinct types for TYPE_DECLs by calling
2580 build_type_copy, so the above comparison generally fails. We do
2581 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2582 is equivalent to what this code used to do before the build_type_copy
2583 call. The variant type distinction should not matter for traditional
2584 code, because it doesn't have type qualifiers. */
2585 if (flag_traditional
2586 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
2588 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2592 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2594 /* Declarations of functions can insist on internal linkage
2595 but they can't be inconsistent with internal linkage,
2596 so there can be no error on that account.
2597 However defining the same name twice is no good. */
2598 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2599 /* However, defining once as extern inline and a second
2600 time in another way is ok. */
2601 && ! (DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2602 && ! (DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2606 else if (current_binding_level == global_binding_level)
2608 /* Objects declared at top level: */
2609 /* If at least one is a reference, it's ok. */
2610 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2612 /* Reject two definitions. */
2613 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2615 /* Now we have two tentative defs, or one tentative and one real def. */
2616 /* Insist that the linkage match. */
2617 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2621 else if (current_binding_level->parm_flag
2622 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2626 /* Newdecl has block scope. If olddecl has block scope also, then
2627 reject two definitions, and reject a definition together with an
2628 external reference. Otherwise, it is OK, because newdecl must
2629 be an extern reference to olddecl. */
2630 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2631 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2637 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2638 Create one if none exists so far for the current function.
2639 This function is called for both label definitions and label references. */
2645 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2647 if (current_function_decl == 0)
2649 error ("label %s referenced outside of any function",
2650 IDENTIFIER_POINTER (id));
2654 /* Use a label already defined or ref'd with this name. */
2657 /* But not if it is inherited and wasn't declared to be inheritable. */
2658 if (DECL_CONTEXT (decl) != current_function_decl
2659 && ! C_DECLARED_LABEL_FLAG (decl))
2660 return shadow_label (id);
2664 decl = build_decl (LABEL_DECL, id, void_type_node);
2666 /* Make sure every label has an rtx. */
2669 /* A label not explicitly declared must be local to where it's ref'd. */
2670 DECL_CONTEXT (decl) = current_function_decl;
2672 DECL_MODE (decl) = VOIDmode;
2674 /* Say where one reference is to the label,
2675 for the sake of the error if it is not defined. */
2676 DECL_SOURCE_LINE (decl) = lineno;
2677 DECL_SOURCE_FILE (decl) = input_filename;
2679 IDENTIFIER_LABEL_VALUE (id) = decl;
2681 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2686 /* Make a label named NAME in the current function,
2687 shadowing silently any that may be inherited from containing functions
2688 or containing scopes.
2690 Note that valid use, if the label being shadowed
2691 comes from another scope in the same function,
2692 requires calling declare_nonlocal_label right away. */
2698 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2704 /* Check to make sure that the label hasn't already been declared
2705 at this label scope */
2706 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2707 if (TREE_VALUE (dup) == decl)
2709 error ("duplicate label declaration `%s'",
2710 IDENTIFIER_POINTER (name));
2711 error_with_decl (TREE_VALUE (dup),
2712 "this is a previous declaration");
2713 /* Just use the previous declaration. */
2714 return lookup_label (name);
2717 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2718 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2721 return lookup_label (name);
2724 /* Define a label, specifying the location in the source file.
2725 Return the LABEL_DECL node for the label, if the definition is valid.
2726 Otherwise return 0. */
2729 define_label (filename, line, name)
2730 const char *filename;
2734 tree decl = lookup_label (name);
2736 /* If label with this name is known from an outer context, shadow it. */
2737 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2739 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2740 IDENTIFIER_LABEL_VALUE (name) = 0;
2741 decl = lookup_label (name);
2744 if (warn_traditional && lookup_name (name))
2745 warning ("traditional C lacks a separate namespace for labels, identifier `%s' conflicts",
2746 IDENTIFIER_POINTER (name));
2748 if (DECL_INITIAL (decl) != 0)
2750 error ("duplicate label `%s'", IDENTIFIER_POINTER (name));
2755 /* Mark label as having been defined. */
2756 DECL_INITIAL (decl) = error_mark_node;
2757 /* Say where in the source. */
2758 DECL_SOURCE_FILE (decl) = filename;
2759 DECL_SOURCE_LINE (decl) = line;
2764 /* Return the list of declarations of the current level.
2765 Note that this list is in reverse order unless/until
2766 you nreverse it; and when you do nreverse it, you must
2767 store the result back using `storedecls' or you will lose. */
2772 return current_binding_level->names;
2775 /* Return the list of type-tags (for structs, etc) of the current level. */
2780 return current_binding_level->tags;
2783 /* Store the list of declarations of the current level.
2784 This is done for the parameter declarations of a function being defined,
2785 after they are modified in the light of any missing parameters. */
2791 current_binding_level->names = decls;
2794 /* Similarly, store the list of tags of the current level. */
2800 current_binding_level->tags = tags;
2803 /* Given NAME, an IDENTIFIER_NODE,
2804 return the structure (or union or enum) definition for that name.
2805 Searches binding levels from BINDING_LEVEL up to the global level.
2806 If THISLEVEL_ONLY is nonzero, searches only the specified context
2807 (but skips any tag-transparent contexts to find one that is
2808 meaningful for tags).
2809 CODE says which kind of type the caller wants;
2810 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2811 If the wrong kind of type is found, an error is reported. */
2814 lookup_tag (code, name, binding_level, thislevel_only)
2815 enum tree_code code;
2816 struct binding_level *binding_level;
2820 register struct binding_level *level;
2822 for (level = binding_level; level; level = level->level_chain)
2825 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2827 if (TREE_PURPOSE (tail) == name)
2829 if (TREE_CODE (TREE_VALUE (tail)) != code)
2831 /* Definition isn't the kind we were looking for. */
2832 pending_invalid_xref = name;
2833 pending_invalid_xref_file = input_filename;
2834 pending_invalid_xref_line = lineno;
2836 return TREE_VALUE (tail);
2839 if (thislevel_only && ! level->tag_transparent)
2845 /* Print an error message now
2846 for a recent invalid struct, union or enum cross reference.
2847 We don't print them immediately because they are not invalid
2848 when used in the `struct foo;' construct for shadowing. */
2851 pending_xref_error ()
2853 if (pending_invalid_xref != 0)
2854 error_with_file_and_line (pending_invalid_xref_file,
2855 pending_invalid_xref_line,
2856 "`%s' defined as wrong kind of tag",
2857 IDENTIFIER_POINTER (pending_invalid_xref));
2858 pending_invalid_xref = 0;
2861 /* Given a type, find the tag that was defined for it and return the tag name.
2862 Otherwise return 0. */
2865 lookup_tag_reverse (type)
2868 register struct binding_level *level;
2870 for (level = current_binding_level; level; level = level->level_chain)
2873 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2875 if (TREE_VALUE (tail) == type)
2876 return TREE_PURPOSE (tail);
2882 /* Look up NAME in the current binding level and its superiors
2883 in the namespace of variables, functions and typedefs.
2884 Return a ..._DECL node of some kind representing its definition,
2885 or return 0 if it is undefined. */
2892 if (current_binding_level != global_binding_level
2893 && IDENTIFIER_LOCAL_VALUE (name))
2894 val = IDENTIFIER_LOCAL_VALUE (name);
2896 val = IDENTIFIER_GLOBAL_VALUE (name);
2900 /* Similar to `lookup_name' but look only at current binding level. */
2903 lookup_name_current_level (name)
2908 if (current_binding_level == global_binding_level)
2909 return IDENTIFIER_GLOBAL_VALUE (name);
2911 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2914 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2915 if (DECL_NAME (t) == name)
2921 /* Mark ARG for GC. */
2924 mark_binding_level (arg)
2927 struct binding_level *level = *(struct binding_level **) arg;
2929 for (; level != 0; level = level->level_chain)
2931 ggc_mark_tree (level->names);
2932 ggc_mark_tree (level->tags);
2933 ggc_mark_tree (level->shadowed);
2934 ggc_mark_tree (level->blocks);
2935 ggc_mark_tree (level->this_block);
2936 ggc_mark_tree (level->parm_order);
2940 /* Create the predefined scalar types of C,
2941 and some nodes representing standard constants (0, 1, (void *) 0).
2942 Initialize the global binding level.
2943 Make definitions for built-in primitive functions. */
2946 init_decl_processing ()
2948 register tree endlink;
2949 tree ptr_ftype_void, ptr_ftype_ptr;
2950 int wchar_type_size;
2951 tree array_domain_type;
2954 current_function_decl = NULL;
2955 named_labels = NULL;
2956 current_binding_level = NULL_BINDING_LEVEL;
2957 free_binding_level = NULL_BINDING_LEVEL;
2958 pushlevel (0); /* make the binding_level structure for global names */
2959 global_binding_level = current_binding_level;
2961 build_common_tree_nodes (flag_signed_char);
2963 /* Define `int' and `char' first so that dbx will output them first. */
2964 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_INT],
2965 integer_type_node));
2966 pushdecl (build_decl (TYPE_DECL, get_identifier ("char"),
2968 pushdecl (build_decl (TYPE_DECL, get_identifier ("long int"),
2969 long_integer_type_node));
2970 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned int"),
2971 unsigned_type_node));
2972 pushdecl (build_decl (TYPE_DECL, get_identifier ("long unsigned int"),
2973 long_unsigned_type_node));
2974 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long int"),
2975 long_long_integer_type_node));
2976 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long unsigned int"),
2977 long_long_unsigned_type_node));
2978 pushdecl (build_decl (TYPE_DECL, get_identifier ("short int"),
2979 short_integer_type_node));
2980 pushdecl (build_decl (TYPE_DECL, get_identifier ("short unsigned int"),
2981 short_unsigned_type_node));
2982 pushdecl (build_decl (TYPE_DECL, get_identifier ("signed char"),
2983 signed_char_type_node));
2984 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned char"),
2985 unsigned_char_type_node));
2986 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intQI_type_node));
2987 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intHI_type_node));
2988 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intSI_type_node));
2989 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
2990 #if HOST_BITS_PER_WIDE_INT >= 64
2991 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intTI_type_node));
2993 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node));
2994 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intHI_type_node));
2995 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intSI_type_node));
2996 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node));
2997 #if HOST_BITS_PER_WIDE_INT >= 64
2998 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intTI_type_node));
3001 /* `unsigned long' is the standard type for sizeof.
3002 Traditionally, use a signed type.
3003 Note that stddef.h uses `unsigned long',
3004 and this must agree, even if long and int are the same size. */
3005 t = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE)));
3006 signed_size_type_node = signed_type (t);
3007 if (flag_traditional && TREE_UNSIGNED (t))
3008 t = signed_type (t);
3012 /* Create the widest literal types. */
3013 widest_integer_literal_type_node
3014 = make_signed_type (HOST_BITS_PER_WIDE_INT * 2);
3015 widest_unsigned_literal_type_node
3016 = make_unsigned_type (HOST_BITS_PER_WIDE_INT * 2);
3017 pushdecl (build_decl (TYPE_DECL, NULL_TREE,
3018 widest_integer_literal_type_node));
3019 pushdecl (build_decl (TYPE_DECL, NULL_TREE,
3020 widest_unsigned_literal_type_node));
3022 build_common_tree_nodes_2 (flag_short_double);
3024 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_FLOAT],
3026 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_DOUBLE],
3028 pushdecl (build_decl (TYPE_DECL, get_identifier ("long double"),
3029 long_double_type_node));
3030 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex int"),
3031 complex_integer_type_node));
3032 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex float"),
3033 complex_float_type_node));
3034 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex double"),
3035 complex_double_type_node));
3036 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex long double"),
3037 complex_long_double_type_node));
3038 pushdecl (build_decl (TYPE_DECL,
3039 ridpointers[(int) RID_VOID], void_type_node));
3041 #ifdef MD_INIT_BUILTINS
3045 wchar_type_node = get_identifier (flag_short_wchar
3046 ? "short unsigned int"
3048 wchar_type_node = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (wchar_type_node));
3049 wchar_type_size = TYPE_PRECISION (wchar_type_node);
3050 signed_wchar_type_node = signed_type (wchar_type_node);
3051 unsigned_wchar_type_node = unsigned_type (wchar_type_node);
3053 wint_type_node = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (WINT_TYPE)));
3055 boolean_type_node = integer_type_node;
3056 boolean_true_node = integer_one_node;
3057 boolean_false_node = integer_zero_node;
3059 string_type_node = build_pointer_type (char_type_node);
3060 const_string_type_node
3061 = build_pointer_type (build_type_variant (char_type_node, 1, 0));
3063 /* Make a type to be the domain of a few array types
3064 whose domains don't really matter.
3065 200 is small enough that it always fits in size_t
3066 and large enough that it can hold most function names for the
3067 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
3068 array_domain_type = build_index_type (build_int_2 (200, 0));
3070 /* make a type for arrays of characters.
3071 With luck nothing will ever really depend on the length of this
3073 char_array_type_node
3074 = build_array_type (char_type_node, array_domain_type);
3076 /* Likewise for arrays of ints. */
3078 = build_array_type (integer_type_node, array_domain_type);
3080 /* This is for wide string constants. */
3081 wchar_array_type_node
3082 = build_array_type (wchar_type_node, array_domain_type);
3084 void_list_node = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
3086 default_function_type
3087 = build_function_type (integer_type_node, NULL_TREE);
3089 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE)));
3090 unsigned_ptrdiff_type_node = unsigned_type (ptrdiff_type_node);
3092 c_common_nodes_and_builtins (0, flag_no_builtin, flag_no_nonansi_builtin);
3094 endlink = void_list_node;
3095 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
3097 = build_function_type (ptr_type_node,
3098 tree_cons (NULL_TREE, ptr_type_node, endlink));
3100 /* Types which are common to the fortran compiler and libf2c. When
3101 changing these, you also need to be concerned with f/com.h. */
3103 if (TYPE_PRECISION (float_type_node)
3104 == TYPE_PRECISION (long_integer_type_node))
3106 g77_integer_type_node = long_integer_type_node;
3107 g77_uinteger_type_node = long_unsigned_type_node;
3109 else if (TYPE_PRECISION (float_type_node)
3110 == TYPE_PRECISION (integer_type_node))
3112 g77_integer_type_node = integer_type_node;
3113 g77_uinteger_type_node = unsigned_type_node;
3116 g77_integer_type_node = g77_uinteger_type_node = NULL_TREE;
3118 if (g77_integer_type_node != NULL_TREE)
3120 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_integer"),
3121 g77_integer_type_node));
3122 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_uinteger"),
3123 g77_uinteger_type_node));
3126 if (TYPE_PRECISION (float_type_node) * 2
3127 == TYPE_PRECISION (long_integer_type_node))
3129 g77_longint_type_node = long_integer_type_node;
3130 g77_ulongint_type_node = long_unsigned_type_node;
3132 else if (TYPE_PRECISION (float_type_node) * 2
3133 == TYPE_PRECISION (long_long_integer_type_node))
3135 g77_longint_type_node = long_long_integer_type_node;
3136 g77_ulongint_type_node = long_long_unsigned_type_node;
3139 g77_longint_type_node = g77_ulongint_type_node = NULL_TREE;
3141 if (g77_longint_type_node != NULL_TREE)
3143 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_longint"),
3144 g77_longint_type_node));
3145 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_ulongint"),
3146 g77_ulongint_type_node));
3149 builtin_function ("__builtin_aggregate_incoming_address",
3150 build_function_type (ptr_type_node, NULL_TREE),
3151 BUILT_IN_AGGREGATE_INCOMING_ADDRESS,
3152 BUILT_IN_NORMAL, NULL_PTR);
3154 /* Hooks for the DWARF 2 __throw routine. */
3155 builtin_function ("__builtin_unwind_init",
3156 build_function_type (void_type_node, endlink),
3157 BUILT_IN_UNWIND_INIT, BUILT_IN_NORMAL, NULL_PTR);
3158 builtin_function ("__builtin_dwarf_cfa", ptr_ftype_void,
3159 BUILT_IN_DWARF_CFA, BUILT_IN_NORMAL, NULL_PTR);
3160 builtin_function ("__builtin_dwarf_fp_regnum",
3161 build_function_type (unsigned_type_node, endlink),
3162 BUILT_IN_DWARF_FP_REGNUM, BUILT_IN_NORMAL, NULL_PTR);
3163 builtin_function ("__builtin_init_dwarf_reg_size_table", void_ftype_ptr,
3164 BUILT_IN_INIT_DWARF_REG_SIZES, BUILT_IN_NORMAL, NULL_PTR);
3165 builtin_function ("__builtin_frob_return_addr", ptr_ftype_ptr,
3166 BUILT_IN_FROB_RETURN_ADDR, BUILT_IN_NORMAL, NULL_PTR);
3167 builtin_function ("__builtin_extract_return_addr", ptr_ftype_ptr,
3168 BUILT_IN_EXTRACT_RETURN_ADDR, BUILT_IN_NORMAL, NULL_PTR);
3170 ("__builtin_eh_return",
3171 build_function_type (void_type_node,
3172 tree_cons (NULL_TREE, ptr_type_node,
3173 tree_cons (NULL_TREE,
3174 type_for_mode (ptr_mode, 0),
3175 tree_cons (NULL_TREE,
3178 BUILT_IN_EH_RETURN, BUILT_IN_NORMAL, NULL_PTR);
3180 pedantic_lvalues = pedantic;
3182 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
3183 make_fname_decl = c_make_fname_decl;
3184 declare_function_name ();
3186 start_identifier_warnings ();
3188 /* Prepare to check format strings against argument lists. */
3189 init_function_format_info ();
3193 incomplete_decl_finalize_hook = finish_incomplete_decl;
3195 /* Record our roots. */
3197 ggc_add_tree_root (c_global_trees, CTI_MAX);
3198 ggc_add_tree_root (&named_labels, 1);
3199 ggc_add_tree_root (&shadowed_labels, 1);
3200 ggc_add_root (¤t_binding_level, 1, sizeof current_binding_level,
3201 mark_binding_level);
3202 ggc_add_root (&label_level_chain, 1, sizeof label_level_chain,
3203 mark_binding_level);
3204 ggc_add_tree_root (&static_ctors, 1);
3205 ggc_add_tree_root (&static_dtors, 1);
3208 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3209 decl, NAME is the initialization string and TYPE_DEP indicates whether
3210 NAME depended on the type of the function. As we don't yet implement
3211 delayed emission of static data, we mark the decl as emitted
3212 so it is not placed in the output. Anything using it must therefore pull
3213 out the STRING_CST initializer directly. This does mean that these names
3214 are string merging candidates, which C99 does not permit. */
3217 c_make_fname_decl (id, name, type_dep)
3220 int type_dep ATTRIBUTE_UNUSED;
3222 tree decl, type, init;
3223 size_t length = strlen (name);
3225 type = build_array_type
3226 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
3227 build_index_type (build_int_2 (length, 0)));
3229 decl = build_decl (VAR_DECL, id, type);
3230 TREE_STATIC (decl) = 1;
3231 TREE_READONLY (decl) = 1;
3232 TREE_ASM_WRITTEN (decl) = 1;
3233 DECL_SOURCE_LINE (decl) = 0;
3234 DECL_ARTIFICIAL (decl) = 1;
3235 DECL_IN_SYSTEM_HEADER (decl) = 1;
3236 DECL_IGNORED_P (decl) = 1;
3237 init = build_string (length + 1, name);
3238 TREE_TYPE (init) = type;
3239 DECL_INITIAL (decl) = init;
3240 finish_decl (pushdecl (decl), init, NULL_TREE);
3245 /* Return a definition for a builtin function named NAME and whose data type
3246 is TYPE. TYPE should be a function type with argument types.
3247 FUNCTION_CODE tells later passes how to compile calls to this function.
3248 See tree.h for its possible values.
3250 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3251 the name to be called if we can't opencode the function. */
3254 builtin_function (name, type, function_code, class, library_name)
3258 enum built_in_class class;
3259 const char *library_name;
3261 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3262 DECL_EXTERNAL (decl) = 1;
3263 TREE_PUBLIC (decl) = 1;
3264 /* If -traditional, permit redefining a builtin function any way you like.
3265 (Though really, if the program redefines these functions,
3266 it probably won't work right unless compiled with -fno-builtin.) */
3267 if (flag_traditional && name[0] != '_')
3268 DECL_BUILT_IN_NONANSI (decl) = 1;
3270 DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
3271 make_decl_rtl (decl, NULL_PTR, 1);
3273 DECL_BUILT_IN_CLASS (decl) = class;
3274 DECL_FUNCTION_CODE (decl) = function_code;
3276 /* Warn if a function in the namespace for users
3277 is used without an occasion to consider it declared. */
3278 if (name[0] != '_' || name[1] != '_')
3279 C_DECL_ANTICIPATED (decl) = 1;
3284 /* Called when a declaration is seen that contains no names to declare.
3285 If its type is a reference to a structure, union or enum inherited
3286 from a containing scope, shadow that tag name for the current scope
3287 with a forward reference.
3288 If its type defines a new named structure or union
3289 or defines an enum, it is valid but we need not do anything here.
3290 Otherwise, it is an error. */
3293 shadow_tag (declspecs)
3296 shadow_tag_warned (declspecs, 0);
3300 shadow_tag_warned (declspecs, warned)
3303 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3310 pending_invalid_xref = 0;
3312 /* Remove the attributes from declspecs, since they will confuse the
3314 split_specs_attrs (declspecs, &specs, &attrs);
3316 for (link = specs; link; link = TREE_CHAIN (link))
3318 register tree value = TREE_VALUE (link);
3319 register enum tree_code code = TREE_CODE (value);
3321 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3322 /* Used to test also that TYPE_SIZE (value) != 0.
3323 That caused warning for `struct foo;' at top level in the file. */
3325 register tree name = lookup_tag_reverse (value);
3332 if (warned != 1 && code != ENUMERAL_TYPE)
3333 /* Empty unnamed enum OK */
3335 pedwarn ("unnamed struct/union that defines no instances");
3341 t = lookup_tag (code, name, current_binding_level, 1);
3345 t = make_node (code);
3352 if (!warned && ! in_system_header)
3354 warning ("useless keyword or type name in empty declaration");
3361 error ("two types specified in one empty declaration");
3366 pedwarn ("empty declaration");
3370 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3373 groktypename (typename)
3376 if (TREE_CODE (typename) != TREE_LIST)
3378 return grokdeclarator (TREE_VALUE (typename),
3379 TREE_PURPOSE (typename),
3383 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3386 groktypename_in_parm_context (typename)
3389 if (TREE_CODE (typename) != TREE_LIST)
3391 return grokdeclarator (TREE_VALUE (typename),
3392 TREE_PURPOSE (typename),
3396 /* Decode a declarator in an ordinary declaration or data definition.
3397 This is called as soon as the type information and variable name
3398 have been parsed, before parsing the initializer if any.
3399 Here we create the ..._DECL node, fill in its type,
3400 and put it on the list of decls for the current context.
3401 The ..._DECL node is returned as the value.
3403 Exception: for arrays where the length is not specified,
3404 the type is left null, to be filled in by `finish_decl'.
3406 Function definitions do not come here; they go to start_function
3407 instead. However, external and forward declarations of functions
3408 do go through here. Structure field declarations are done by
3409 grokfield and not through here. */
3412 start_decl (declarator, declspecs, initialized, attributes, prefix_attributes)
3413 tree declarator, declspecs;
3415 tree attributes, prefix_attributes;
3417 register tree decl = grokdeclarator (declarator, declspecs,
3418 NORMAL, initialized);
3421 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3422 && !strcmp (IDENTIFIER_POINTER (DECL_NAME (decl)), "main"))
3423 warning_with_decl (decl, "`%s' is usually a function");
3426 /* Is it valid for this decl to have an initializer at all?
3427 If not, set INITIALIZED to zero, which will indirectly
3428 tell `finish_decl' to ignore the initializer once it is parsed. */
3429 switch (TREE_CODE (decl))
3432 /* typedef foo = bar means give foo the same type as bar.
3433 We haven't parsed bar yet, so `finish_decl' will fix that up.
3434 Any other case of an initialization in a TYPE_DECL is an error. */
3435 if (pedantic || list_length (declspecs) > 1)
3437 error ("typedef `%s' is initialized",
3438 IDENTIFIER_POINTER (DECL_NAME (decl)));
3444 error ("function `%s' is initialized like a variable",
3445 IDENTIFIER_POINTER (DECL_NAME (decl)));
3450 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3451 error ("parameter `%s' is initialized",
3452 IDENTIFIER_POINTER (DECL_NAME (decl)));
3457 /* Don't allow initializations for incomplete types
3458 except for arrays which might be completed by the initialization. */
3459 if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3461 /* A complete type is ok if size is fixed. */
3463 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3464 || C_DECL_VARIABLE_SIZE (decl))
3466 error ("variable-sized object may not be initialized");
3470 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3472 error ("variable `%s' has initializer but incomplete type",
3473 IDENTIFIER_POINTER (DECL_NAME (decl)));
3476 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
3478 error ("elements of array `%s' have incomplete type",
3479 IDENTIFIER_POINTER (DECL_NAME (decl)));
3486 #if 0 /* Seems redundant with grokdeclarator. */
3487 if (current_binding_level != global_binding_level
3488 && DECL_EXTERNAL (decl)
3489 && TREE_CODE (decl) != FUNCTION_DECL)
3490 warning ("declaration of `%s' has `extern' and is initialized",
3491 IDENTIFIER_POINTER (DECL_NAME (decl)));
3493 DECL_EXTERNAL (decl) = 0;
3494 if (current_binding_level == global_binding_level)
3495 TREE_STATIC (decl) = 1;
3497 /* Tell `pushdecl' this is an initialized decl
3498 even though we don't yet have the initializer expression.
3499 Also tell `finish_decl' it may store the real initializer. */
3500 DECL_INITIAL (decl) = error_mark_node;
3503 /* If this is a function declaration, write a record describing it to the
3504 prototypes file (if requested). */
3506 if (TREE_CODE (decl) == FUNCTION_DECL)
3507 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3509 /* ANSI specifies that a tentative definition which is not merged with
3510 a non-tentative definition behaves exactly like a definition with an
3511 initializer equal to zero. (Section 3.7.2)
3512 -fno-common gives strict ANSI behavior. Usually you don't want it.
3513 This matters only for variables with external linkage. */
3514 if (! flag_no_common || ! TREE_PUBLIC (decl))
3515 DECL_COMMON (decl) = 1;
3517 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
3518 SET_DEFAULT_DECL_ATTRIBUTES (decl, attributes);
3521 /* Set attributes here so if duplicate decl, will have proper attributes. */
3522 decl_attributes (decl, attributes, prefix_attributes);
3524 /* Add this decl to the current binding level.
3525 TEM may equal DECL or it may be a previous decl of the same name. */
3526 tem = pushdecl (decl);
3528 /* For a local variable, define the RTL now. */
3529 if (current_binding_level != global_binding_level
3530 /* But not if this is a duplicate decl
3531 and we preserved the rtl from the previous one
3532 (which may or may not happen). */
3533 && DECL_RTL (tem) == 0)
3535 if (COMPLETE_TYPE_P (TREE_TYPE (tem)))
3537 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3538 && DECL_INITIAL (tem) != 0)
3545 /* Finish processing of a declaration;
3546 install its initial value.
3547 If the length of an array type is not known before,
3548 it must be determined now, from the initial value, or it is an error. */
3551 finish_decl (decl, init, asmspec_tree)
3555 register tree type = TREE_TYPE (decl);
3556 int was_incomplete = (DECL_SIZE (decl) == 0);
3559 /* If a name was specified, get the string. */
3561 asmspec = TREE_STRING_POINTER (asmspec_tree);
3563 /* If `start_decl' didn't like having an initialization, ignore it now. */
3565 if (init != 0 && DECL_INITIAL (decl) == 0)
3567 /* Don't crash if parm is initialized. */
3568 if (TREE_CODE (decl) == PARM_DECL)
3571 if (ITERATOR_P (decl))
3574 error_with_decl (decl, "iterator has no initial value");
3576 init = save_expr (init);
3581 if (TREE_CODE (decl) != TYPE_DECL)
3582 store_init_value (decl, init);
3585 /* typedef foo = bar; store the type of bar as the type of foo. */
3586 TREE_TYPE (decl) = TREE_TYPE (init);
3587 DECL_INITIAL (decl) = init = 0;
3591 /* Deduce size of array from initialization, if not already known */
3593 if (TREE_CODE (type) == ARRAY_TYPE
3594 && TYPE_DOMAIN (type) == 0
3595 && TREE_CODE (decl) != TYPE_DECL)
3598 = (TREE_STATIC (decl)
3599 /* Even if pedantic, an external linkage array
3600 may have incomplete type at first. */
3601 ? pedantic && !TREE_PUBLIC (decl)
3602 : !DECL_EXTERNAL (decl));
3604 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3606 /* Get the completed type made by complete_array_type. */
3607 type = TREE_TYPE (decl);
3610 error_with_decl (decl, "initializer fails to determine size of `%s'");
3615 error_with_decl (decl, "array size missing in `%s'");
3616 /* If a `static' var's size isn't known,
3617 make it extern as well as static, so it does not get
3619 If it is not `static', then do not mark extern;
3620 finish_incomplete_decl will give it a default size
3621 and it will get allocated. */
3622 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3623 DECL_EXTERNAL (decl) = 1;
3626 /* TYPE_MAX_VALUE is always one less than the number of elements
3627 in the array, because we start counting at zero. Therefore,
3628 warn only if the value is less than zero. */
3629 if (pedantic && TYPE_DOMAIN (type) != 0
3630 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3631 error_with_decl (decl, "zero or negative size array `%s'");
3633 layout_decl (decl, 0);
3636 if (TREE_CODE (decl) == VAR_DECL)
3638 if (DECL_SIZE (decl) == 0 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3639 layout_decl (decl, 0);
3641 if (DECL_SIZE (decl) == 0
3642 && (TREE_STATIC (decl)
3644 /* A static variable with an incomplete type
3645 is an error if it is initialized.
3646 Also if it is not file scope.
3647 Otherwise, let it through, but if it is not `extern'
3648 then it may cause an error message later. */
3649 /* A duplicate_decls call could have changed an extern
3650 declaration into a file scope one. This can be detected
3651 by TREE_ASM_WRITTEN being set. */
3652 (DECL_INITIAL (decl) != 0
3653 || (DECL_CONTEXT (decl) != 0 && ! TREE_ASM_WRITTEN (decl)))
3655 /* An automatic variable with an incomplete type
3657 !DECL_EXTERNAL (decl)))
3659 error_with_decl (decl, "storage size of `%s' isn't known");
3660 TREE_TYPE (decl) = error_mark_node;
3663 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3664 && DECL_SIZE (decl) != 0)
3666 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3667 constant_expression_warning (DECL_SIZE (decl));
3669 error_with_decl (decl, "storage size of `%s' isn't constant");
3672 if (TREE_USED (type))
3673 TREE_USED (decl) = 1;
3676 /* If this is a function and an assembler name is specified, it isn't
3677 builtin any more. Also reset DECL_RTL so we can give it its new
3679 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3681 DECL_BUILT_IN_CLASS (decl) = NOT_BUILT_IN;
3682 DECL_RTL (decl) = 0;
3683 DECL_ASSEMBLER_NAME (decl) = get_identifier (asmspec);
3686 /* Output the assembler code and/or RTL code for variables and functions,
3687 unless the type is an undefined structure or union.
3688 If not, it will get done when the type is completed. */
3690 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3692 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3693 maybe_objc_check_decl (decl);
3694 rest_of_decl_compilation (decl, asmspec,
3695 (DECL_CONTEXT (decl) == 0
3696 || TREE_ASM_WRITTEN (decl)), 0);
3698 if (DECL_CONTEXT (decl) != 0)
3700 /* Recompute the RTL of a local array now
3701 if it used to be an incomplete type. */
3703 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3705 /* If we used it already as memory, it must stay in memory. */
3706 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3707 /* If it's still incomplete now, no init will save it. */
3708 if (DECL_SIZE (decl) == 0)
3709 DECL_INITIAL (decl) = 0;
3712 /* Compute and store the initial value. */
3713 if (TREE_CODE (decl) != FUNCTION_DECL)
3714 expand_decl_init (decl);
3718 if (TREE_CODE (decl) == TYPE_DECL)
3720 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3721 maybe_objc_check_decl (decl);
3722 rest_of_decl_compilation (decl, NULL_PTR, DECL_CONTEXT (decl) == 0, 0);
3725 /* At the end of a declaration, throw away any variable type sizes
3726 of types defined inside that declaration. There is no use
3727 computing them in the following function definition. */
3728 if (current_binding_level == global_binding_level)
3729 get_pending_sizes ();
3732 /* If DECL has a cleanup, build and return that cleanup here.
3733 This is a callback called by expand_expr. */
3736 maybe_build_cleanup (decl)
3737 tree decl ATTRIBUTE_UNUSED;
3739 /* There are no cleanups in C. */
3743 /* Given a parsed parameter declaration,
3744 decode it into a PARM_DECL and push that on the current binding level.
3745 Also, for the sake of forward parm decls,
3746 record the given order of parms in `parm_order'. */
3749 push_parm_decl (parm)
3753 int old_immediate_size_expand = immediate_size_expand;
3754 /* Don't try computing parm sizes now -- wait till fn is called. */
3755 immediate_size_expand = 0;
3757 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3758 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3759 decl_attributes (decl, TREE_VALUE (TREE_VALUE (parm)),
3760 TREE_PURPOSE (TREE_VALUE (parm)));
3763 if (DECL_NAME (decl))
3766 olddecl = lookup_name (DECL_NAME (decl));
3767 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3768 pedwarn_with_decl (decl, "ANSI C forbids parameter `%s' shadowing typedef");
3772 decl = pushdecl (decl);
3774 immediate_size_expand = old_immediate_size_expand;
3776 current_binding_level->parm_order
3777 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3779 /* Add this decl to the current binding level. */
3780 finish_decl (decl, NULL_TREE, NULL_TREE);
3783 /* Clear the given order of parms in `parm_order'.
3784 Used at start of parm list,
3785 and also at semicolon terminating forward decls. */
3790 current_binding_level->parm_order = NULL_TREE;
3793 /* Make TYPE a complete type based on INITIAL_VALUE.
3794 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3795 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3798 complete_array_type (type, initial_value, do_default)
3803 register tree maxindex = NULL_TREE;
3808 /* Note MAXINDEX is really the maximum index,
3809 one less than the size. */
3810 if (TREE_CODE (initial_value) == STRING_CST)
3813 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3814 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3817 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3819 tree elts = CONSTRUCTOR_ELTS (initial_value);
3820 maxindex = build_int_2 (-1, -1);
3821 for (; elts; elts = TREE_CHAIN (elts))
3823 if (TREE_PURPOSE (elts))
3824 maxindex = TREE_PURPOSE (elts);
3826 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3827 maxindex, integer_one_node));
3829 maxindex = copy_node (maxindex);
3833 /* Make an error message unless that happened already. */
3834 if (initial_value != error_mark_node)
3837 /* Prevent further error messages. */
3838 maxindex = build_int_2 (0, 0);
3845 maxindex = build_int_2 (0, 0);
3851 TYPE_DOMAIN (type) = build_index_type (maxindex);
3852 if (!TREE_TYPE (maxindex))
3853 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3856 /* Lay out the type now that we can get the real answer. */
3863 /* Given declspecs and a declarator,
3864 determine the name and type of the object declared
3865 and construct a ..._DECL node for it.
3866 (In one case we can return a ..._TYPE node instead.
3867 For invalid input we sometimes return 0.)
3869 DECLSPECS is a chain of tree_list nodes whose value fields
3870 are the storage classes and type specifiers.
3872 DECL_CONTEXT says which syntactic context this declaration is in:
3873 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3874 FUNCDEF for a function definition. Like NORMAL but a few different
3875 error messages in each case. Return value may be zero meaning
3876 this definition is too screwy to try to parse.
3877 PARM for a parameter declaration (either within a function prototype
3878 or before a function body). Make a PARM_DECL, or return void_type_node.
3879 TYPENAME if for a typename (in a cast or sizeof).
3880 Don't make a DECL node; just return the ..._TYPE node.
3881 FIELD for a struct or union field; make a FIELD_DECL.
3882 BITFIELD for a field with specified width.
3883 INITIALIZED is 1 if the decl has an initializer.
3885 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3886 It may also be so in the PARM case, for a prototype where the
3887 argument type is specified but not the name.
3889 This function is where the complicated C meanings of `static'
3890 and `extern' are interpreted. */
3893 grokdeclarator (declarator, declspecs, decl_context, initialized)
3896 enum decl_context decl_context;
3901 tree type = NULL_TREE;
3906 int type_quals = TYPE_UNQUALIFIED;
3908 int explicit_int = 0;
3909 int explicit_char = 0;
3910 int defaulted_int = 0;
3911 tree typedef_decl = 0;
3913 tree typedef_type = 0;
3914 int funcdef_flag = 0;
3915 enum tree_code innermost_code = ERROR_MARK;
3917 int size_varies = 0;
3918 tree decl_machine_attr = NULL_TREE;
3920 if (decl_context == BITFIELD)
3921 bitfield = 1, decl_context = FIELD;
3923 if (decl_context == FUNCDEF)
3924 funcdef_flag = 1, decl_context = NORMAL;
3926 /* Look inside a declarator for the name being declared
3927 and get it as a string, for an error message. */
3929 register tree decl = declarator;
3933 switch (TREE_CODE (decl))
3938 innermost_code = TREE_CODE (decl);
3939 decl = TREE_OPERAND (decl, 0);
3942 case IDENTIFIER_NODE:
3943 name = IDENTIFIER_POINTER (decl);
3954 /* A function definition's declarator must have the form of
3955 a function declarator. */
3957 if (funcdef_flag && innermost_code != CALL_EXPR)
3960 /* Anything declared one level down from the top level
3961 must be one of the parameters of a function
3962 (because the body is at least two levels down). */
3964 /* If this looks like a function definition, make it one,
3965 even if it occurs where parms are expected.
3966 Then store_parm_decls will reject it and not use it as a parm. */
3967 if (decl_context == NORMAL && !funcdef_flag
3968 && current_binding_level->parm_flag)
3969 decl_context = PARM;
3971 /* Look through the decl specs and record which ones appear.
3972 Some typespecs are defined as built-in typenames.
3973 Others, the ones that are modifiers of other types,
3974 are represented by bits in SPECBITS: set the bits for
3975 the modifiers that appear. Storage class keywords are also in SPECBITS.
3977 If there is a typedef name or a type, store the type in TYPE.
3978 This includes builtin typedefs such as `int'.
3980 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3981 and did not come from a user typedef.
3983 Set LONGLONG if `long' is mentioned twice. */
3985 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3988 register tree id = TREE_VALUE (spec);
3990 if (id == ridpointers[(int) RID_INT])
3992 if (id == ridpointers[(int) RID_CHAR])
3995 if (TREE_CODE (id) == IDENTIFIER_NODE)
3996 for (i = (int) RID_FIRST_MODIFIER; i < (int) RID_MAX; i++)
3998 if (ridpointers[i] == id)
4000 if (i == (int) RID_LONG && specbits & (1<<i))
4003 error ("`long long long' is too long for GCC");
4006 if (pedantic && !flag_isoc99 && ! in_system_header
4008 pedwarn ("ANSI C does not support `long long'");
4012 else if (specbits & (1 << i))
4013 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
4019 error ("two or more data types in declaration of `%s'", name);
4020 /* Actual typedefs come to us as TYPE_DECL nodes. */
4021 else if (TREE_CODE (id) == TYPE_DECL)
4023 type = TREE_TYPE (id);
4024 decl_machine_attr = DECL_MACHINE_ATTRIBUTES (id);
4027 /* Built-in types come as identifiers. */
4028 else if (TREE_CODE (id) == IDENTIFIER_NODE)
4030 register tree t = lookup_name (id);
4031 if (TREE_TYPE (t) == error_mark_node)
4033 else if (!t || TREE_CODE (t) != TYPE_DECL)
4034 error ("`%s' fails to be a typedef or built in type",
4035 IDENTIFIER_POINTER (id));
4038 type = TREE_TYPE (t);
4042 else if (TREE_CODE (id) != ERROR_MARK)
4048 typedef_type = type;
4050 size_varies = C_TYPE_VARIABLE_SIZE (type);
4052 /* No type at all: default to `int', and set DEFAULTED_INT
4053 because it was not a user-defined typedef. */
4057 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4058 | (1 << (int) RID_SIGNED)
4059 | (1 << (int) RID_UNSIGNED))))
4060 /* Don't warn about typedef foo = bar. */
4061 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
4062 && ! in_system_header)
4064 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
4065 and this is a function, or if -Wimplicit; prefer the former
4066 warning since it is more explicit. */
4067 if ((warn_implicit_int || warn_return_type) && funcdef_flag)
4068 warn_about_return_type = 1;
4069 else if (warn_implicit_int || flag_isoc99)
4070 pedwarn_c99 ("type defaults to `int' in declaration of `%s'", name);
4074 type = integer_type_node;
4077 /* Now process the modifiers that were specified
4078 and check for invalid combinations. */
4080 /* Long double is a special combination. */
4082 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4083 && TYPE_MAIN_VARIANT (type) == double_type_node)
4085 specbits &= ~ (1 << (int) RID_LONG);
4086 type = long_double_type_node;
4089 /* Check all other uses of type modifiers. */
4091 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4092 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4096 if ((specbits & 1 << (int) RID_LONG)
4097 && (specbits & 1 << (int) RID_SHORT))
4098 error ("both long and short specified for `%s'", name);
4099 else if (((specbits & 1 << (int) RID_LONG)
4100 || (specbits & 1 << (int) RID_SHORT))
4102 error ("long or short specified with char for `%s'", name);
4103 else if (((specbits & 1 << (int) RID_LONG)
4104 || (specbits & 1 << (int) RID_SHORT))
4105 && TREE_CODE (type) == REAL_TYPE)
4107 static int already = 0;
4109 error ("long or short specified with floating type for `%s'", name);
4110 if (! already && ! pedantic)
4112 error ("the only valid combination is `long double'");
4116 else if ((specbits & 1 << (int) RID_SIGNED)
4117 && (specbits & 1 << (int) RID_UNSIGNED))
4118 error ("both signed and unsigned specified for `%s'", name);
4119 else if (TREE_CODE (type) != INTEGER_TYPE)
4120 error ("long, short, signed or unsigned invalid for `%s'", name);
4124 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4126 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4128 if (flag_pedantic_errors)
4133 /* Discard the type modifiers if they are invalid. */
4136 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4137 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4142 if ((specbits & (1 << (int) RID_COMPLEX))
4143 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4145 error ("complex invalid for `%s'", name);
4146 specbits &= ~ (1 << (int) RID_COMPLEX);
4149 /* Decide whether an integer type is signed or not.
4150 Optionally treat bitfields as signed by default. */
4151 if (specbits & 1 << (int) RID_UNSIGNED
4152 /* Traditionally, all bitfields are unsigned. */
4153 || (bitfield && flag_traditional
4154 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4155 || (bitfield && ! flag_signed_bitfields
4156 && (explicit_int || defaulted_int || explicit_char
4157 /* A typedef for plain `int' without `signed'
4158 can be controlled just like plain `int'. */
4159 || ! (typedef_decl != 0
4160 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4161 && TREE_CODE (type) != ENUMERAL_TYPE
4162 && !(specbits & 1 << (int) RID_SIGNED)))
4165 type = long_long_unsigned_type_node;
4166 else if (specbits & 1 << (int) RID_LONG)
4167 type = long_unsigned_type_node;
4168 else if (specbits & 1 << (int) RID_SHORT)
4169 type = short_unsigned_type_node;
4170 else if (type == char_type_node)
4171 type = unsigned_char_type_node;
4172 else if (typedef_decl)
4173 type = unsigned_type (type);
4175 type = unsigned_type_node;
4177 else if ((specbits & 1 << (int) RID_SIGNED)
4178 && type == char_type_node)
4179 type = signed_char_type_node;
4181 type = long_long_integer_type_node;
4182 else if (specbits & 1 << (int) RID_LONG)
4183 type = long_integer_type_node;
4184 else if (specbits & 1 << (int) RID_SHORT)
4185 type = short_integer_type_node;
4187 if (specbits & 1 << (int) RID_COMPLEX)
4189 /* If we just have "complex", it is equivalent to
4190 "complex double", but if any modifiers at all are specified it is
4191 the complex form of TYPE. E.g, "complex short" is
4192 "complex short int". */
4194 if (defaulted_int && ! longlong
4195 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4196 | (1 << (int) RID_SIGNED)
4197 | (1 << (int) RID_UNSIGNED))))
4198 type = complex_double_type_node;
4199 else if (type == integer_type_node)
4200 type = complex_integer_type_node;
4201 else if (type == float_type_node)
4202 type = complex_float_type_node;
4203 else if (type == double_type_node)
4204 type = complex_double_type_node;
4205 else if (type == long_double_type_node)
4206 type = complex_long_double_type_node;
4208 type = build_complex_type (type);
4211 /* Figure out the type qualifiers for the declaration. There are
4212 two ways a declaration can become qualified. One is something
4213 like `const int i' where the `const' is explicit. Another is
4214 something like `typedef const int CI; CI i' where the type of the
4215 declaration contains the `const'. */
4216 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4217 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
4218 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4219 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4220 if (constp > 1 && ! flag_isoc99)
4221 pedwarn ("duplicate `const'");
4222 if (restrictp > 1 && ! flag_isoc99)
4223 pedwarn ("duplicate `restrict'");
4224 if (volatilep > 1 && ! flag_isoc99)
4225 pedwarn ("duplicate `volatile'");
4226 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
4227 type = TYPE_MAIN_VARIANT (type);
4228 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4229 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4230 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4232 /* Warn if two storage classes are given. Default to `auto'. */
4237 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4238 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4239 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4240 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4241 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4242 if (specbits & 1 << (int) RID_ITERATOR) nclasses++;
4244 /* Warn about storage classes that are invalid for certain
4245 kinds of declarations (parameters, typenames, etc.). */
4248 error ("multiple storage classes in declaration of `%s'", name);
4249 else if (funcdef_flag
4251 & ((1 << (int) RID_REGISTER)
4252 | (1 << (int) RID_AUTO)
4253 | (1 << (int) RID_TYPEDEF))))
4255 if (specbits & 1 << (int) RID_AUTO
4256 && (pedantic || current_binding_level == global_binding_level))
4257 pedwarn ("function definition declared `auto'");
4258 if (specbits & 1 << (int) RID_REGISTER)
4259 error ("function definition declared `register'");
4260 if (specbits & 1 << (int) RID_TYPEDEF)
4261 error ("function definition declared `typedef'");
4262 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4263 | (1 << (int) RID_AUTO));
4265 else if (decl_context != NORMAL && nclasses > 0)
4267 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4271 switch (decl_context)
4274 error ("storage class specified for structure field `%s'", name);
4277 error ("storage class specified for parameter `%s'", name);
4280 error ("storage class specified for typename");
4283 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4284 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4285 | (1 << (int) RID_EXTERN));
4288 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4290 /* `extern' with initialization is invalid if not at top level. */
4291 if (current_binding_level == global_binding_level)
4292 warning ("`%s' initialized and declared `extern'", name);
4294 error ("`%s' has both `extern' and initializer", name);
4296 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4297 && current_binding_level != global_binding_level)
4298 error ("nested function `%s' declared `extern'", name);
4299 else if (current_binding_level == global_binding_level
4300 && specbits & (1 << (int) RID_AUTO))
4301 error ("top-level declaration of `%s' specifies `auto'", name);
4302 else if ((specbits & 1 << (int) RID_ITERATOR)
4303 && TREE_CODE (declarator) != IDENTIFIER_NODE)
4305 error ("iterator `%s' has derived type", name);
4306 type = error_mark_node;
4308 else if ((specbits & 1 << (int) RID_ITERATOR)
4309 && TREE_CODE (type) != INTEGER_TYPE)
4311 error ("iterator `%s' has noninteger type", name);
4312 type = error_mark_node;
4316 /* Now figure out the structure of the declarator proper.
4317 Descend through it, creating more complex types, until we reach
4318 the declared identifier (or NULL_TREE, in an absolute declarator). */
4320 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4322 if (type == error_mark_node)
4324 declarator = TREE_OPERAND (declarator, 0);
4328 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4329 an INDIRECT_REF (for *...),
4330 a CALL_EXPR (for ...(...)),
4331 an identifier (for the name being declared)
4332 or a null pointer (for the place in an absolute declarator
4333 where the name was omitted).
4334 For the last two cases, we have just exited the loop.
4336 At this point, TYPE is the type of elements of an array,
4337 or for a function to return, or for a pointer to point to.
4338 After this sequence of ifs, TYPE is the type of the
4339 array or function or pointer, and DECLARATOR has had its
4340 outermost layer removed. */
4342 if (TREE_CODE (declarator) == ARRAY_REF)
4344 register tree itype = NULL_TREE;
4345 register tree size = TREE_OPERAND (declarator, 1);
4346 /* The index is a signed object `sizetype' bits wide. */
4347 tree index_type = signed_type (sizetype);
4349 declarator = TREE_OPERAND (declarator, 0);
4351 /* Check for some types that there cannot be arrays of. */
4353 if (VOID_TYPE_P (type))
4355 error ("declaration of `%s' as array of voids", name);
4356 type = error_mark_node;
4359 if (TREE_CODE (type) == FUNCTION_TYPE)
4361 error ("declaration of `%s' as array of functions", name);
4362 type = error_mark_node;
4365 if (size == error_mark_node)
4366 type = error_mark_node;
4368 if (type == error_mark_node)
4371 /* If size was specified, set ITYPE to a range-type for that size.
4372 Otherwise, ITYPE remains null. finish_decl may figure it out
4373 from an initial value. */
4377 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4378 STRIP_TYPE_NOPS (size);
4380 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
4381 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
4383 error ("size of array `%s' has non-integer type", name);
4384 size = integer_one_node;
4387 if (pedantic && integer_zerop (size))
4388 pedwarn ("ANSI C forbids zero-size array `%s'", name);
4390 if (TREE_CODE (size) == INTEGER_CST)
4392 constant_expression_warning (size);
4393 if (tree_int_cst_sgn (size) < 0)
4395 error ("size of array `%s' is negative", name);
4396 size = integer_one_node;
4401 /* Make sure the array size remains visibly nonconstant
4402 even if it is (eg) a const variable with known value. */
4407 if (TREE_CONSTANT (size))
4408 pedwarn ("ANSI C forbids array `%s' whose size can't be evaluated", name);
4410 pedwarn ("ANSI C forbids variable-size array `%s'", name);
4414 /* Convert size to index_type, so that if it is a variable
4415 the computations will be done in the proper mode. */
4416 itype = fold (build (MINUS_EXPR, index_type,
4417 convert (index_type, size),
4418 convert (index_type, size_one_node)));
4420 /* If that overflowed, the array is too big.
4421 ??? While a size of INT_MAX+1 technically shouldn't cause
4422 an overflow (because we subtract 1), the overflow is recorded
4423 during the conversion to index_type, before the subtraction.
4424 Handling this case seems like an unnecessary complication. */
4425 if (TREE_OVERFLOW (itype))
4427 error ("size of array `%s' is too large", name);
4428 type = error_mark_node;
4433 itype = variable_size (itype);
4434 itype = build_index_type (itype);
4437 #if 0 /* This had bad results for pointers to arrays, as in
4438 union incomplete (*foo)[4]; */
4439 /* Complain about arrays of incomplete types, except in typedefs. */
4441 if (!COMPLETE_TYPE_P (type)
4442 /* Avoid multiple warnings for nested array types. */
4443 && TREE_CODE (type) != ARRAY_TYPE
4444 && !(specbits & (1 << (int) RID_TYPEDEF))
4445 && !C_TYPE_BEING_DEFINED (type))
4446 warning ("array type has incomplete element type");
4449 #if 0 /* We shouldn't have a function type here at all!
4450 Functions aren't allowed as array elements. */
4451 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4452 && (constp || volatilep))
4453 pedwarn ("ANSI C forbids const or volatile function types");
4456 /* Build the array type itself, then merge any constancy or
4457 volatility into the target type. We must do it in this order
4458 to ensure that the TYPE_MAIN_VARIANT field of the array type
4459 is set correctly. */
4461 type = build_array_type (type, itype);
4463 type = c_build_qualified_type (type, type_quals);
4465 #if 0 /* don't clear these; leave them set so that the array type
4466 or the variable is itself const or volatile. */
4467 type_quals = TYPE_UNQUALIFIED;
4471 C_TYPE_VARIABLE_SIZE (type) = 1;
4473 else if (TREE_CODE (declarator) == CALL_EXPR)
4477 /* Declaring a function type.
4478 Make sure we have a valid type for the function to return. */
4479 if (type == error_mark_node)
4484 /* Warn about some types functions can't return. */
4486 if (TREE_CODE (type) == FUNCTION_TYPE)
4488 error ("`%s' declared as function returning a function", name);
4489 type = integer_type_node;
4491 if (TREE_CODE (type) == ARRAY_TYPE)
4493 error ("`%s' declared as function returning an array", name);
4494 type = integer_type_node;
4497 #ifndef TRADITIONAL_RETURN_FLOAT
4498 /* Traditionally, declaring return type float means double. */
4500 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4501 type = double_type_node;
4502 #endif /* TRADITIONAL_RETURN_FLOAT */
4504 /* Construct the function type and go to the next
4505 inner layer of declarator. */
4507 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4509 /* Say it's a definition
4510 only for the CALL_EXPR
4511 closest to the identifier. */
4512 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4513 /* Type qualifiers before the return type of the function
4514 qualify the return type, not the function type. */
4516 type = c_build_qualified_type (type, type_quals);
4517 type_quals = TYPE_UNQUALIFIED;
4519 type = build_function_type (type, arg_types);
4520 declarator = TREE_OPERAND (declarator, 0);
4522 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4523 the formal parameter list of this FUNCTION_TYPE to point to
4524 the FUNCTION_TYPE node itself. */
4529 for (link = last_function_parm_tags;
4531 link = TREE_CHAIN (link))
4532 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4535 else if (TREE_CODE (declarator) == INDIRECT_REF)
4537 /* Merge any constancy or volatility into the target type
4540 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4542 pedwarn ("ANSI C forbids qualified function types");
4544 type = c_build_qualified_type (type, type_quals);
4545 type_quals = TYPE_UNQUALIFIED;
4548 type = build_pointer_type (type);
4550 /* Process a list of type modifier keywords
4551 (such as const or volatile) that were given inside the `*'. */
4553 if (TREE_TYPE (declarator))
4555 register tree typemodlist;
4561 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4562 typemodlist = TREE_CHAIN (typemodlist))
4564 tree qualifier = TREE_VALUE (typemodlist);
4566 if (qualifier == ridpointers[(int) RID_CONST])
4568 else if (qualifier == ridpointers[(int) RID_VOLATILE])
4570 else if (qualifier == ridpointers[(int) RID_RESTRICT])
4575 error ("invalid type modifier within pointer declarator");
4578 if (constp > 1 && ! flag_isoc99)
4579 pedwarn ("duplicate `const'");
4580 if (volatilep > 1 && ! flag_isoc99)
4581 pedwarn ("duplicate `volatile'");
4582 if (restrictp > 1 && ! flag_isoc99)
4583 pedwarn ("duplicate `restrict'");
4585 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4586 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4587 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4590 declarator = TREE_OPERAND (declarator, 0);
4597 /* Now TYPE has the actual type. */
4599 /* Did array size calculations overflow? */
4601 if (TREE_CODE (type) == ARRAY_TYPE
4602 && COMPLETE_TYPE_P (type)
4603 && TREE_OVERFLOW (TYPE_SIZE (type)))
4604 error ("size of array `%s' is too large", name);
4606 /* If this is declaring a typedef name, return a TYPE_DECL. */
4608 if (specbits & (1 << (int) RID_TYPEDEF))
4611 /* Note that the grammar rejects storage classes
4612 in typenames, fields or parameters */
4613 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4615 pedwarn ("ANSI C forbids qualified function types");
4617 type = c_build_qualified_type (type, type_quals);
4618 decl = build_decl (TYPE_DECL, declarator, type);
4619 if ((specbits & (1 << (int) RID_SIGNED))
4620 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4621 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4625 /* Detect the case of an array type of unspecified size
4626 which came, as such, direct from a typedef name.
4627 We must copy the type, so that each identifier gets
4628 a distinct type, so that each identifier's size can be
4629 controlled separately by its own initializer. */
4631 if (type != 0 && typedef_type != 0
4632 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type)
4633 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0)
4635 type = build_array_type (TREE_TYPE (type), 0);
4637 C_TYPE_VARIABLE_SIZE (type) = 1;
4640 /* If this is a type name (such as, in a cast or sizeof),
4641 compute the type and return it now. */
4643 if (decl_context == TYPENAME)
4645 /* Note that the grammar rejects storage classes
4646 in typenames, fields or parameters */
4647 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4649 pedwarn ("ANSI C forbids const or volatile function types");
4651 type = c_build_qualified_type (type, type_quals);
4655 /* Aside from typedefs and type names (handle above),
4656 `void' at top level (not within pointer)
4657 is allowed only in public variables.
4658 We don't complain about parms either, but that is because
4659 a better error message can be made later. */
4661 if (VOID_TYPE_P (type) && decl_context != PARM
4662 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4663 && ((specbits & (1 << (int) RID_EXTERN))
4664 || (current_binding_level == global_binding_level
4666 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4668 error ("variable or field `%s' declared void", name);
4669 type = integer_type_node;
4672 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4673 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4678 if (decl_context == PARM)
4680 tree type_as_written = type;
4683 /* A parameter declared as an array of T is really a pointer to T.
4684 One declared as a function is really a pointer to a function. */
4686 if (TREE_CODE (type) == ARRAY_TYPE)
4688 /* Transfer const-ness of array into that of type pointed to. */
4689 type = TREE_TYPE (type);
4691 type = c_build_qualified_type (type, type_quals);
4692 type = build_pointer_type (type);
4693 type_quals = TYPE_UNQUALIFIED;
4696 else if (TREE_CODE (type) == FUNCTION_TYPE)
4698 if (pedantic && type_quals)
4699 pedwarn ("ANSI C forbids qualified function types");
4701 type = c_build_qualified_type (type, type_quals);
4702 type = build_pointer_type (type);
4703 type_quals = TYPE_UNQUALIFIED;
4706 decl = build_decl (PARM_DECL, declarator, type);
4708 C_DECL_VARIABLE_SIZE (decl) = 1;
4710 /* Compute the type actually passed in the parmlist,
4711 for the case where there is no prototype.
4712 (For example, shorts and chars are passed as ints.)
4713 When there is a prototype, this is overridden later. */
4715 if (type == error_mark_node)
4716 promoted_type = type;
4719 promoted_type = simple_type_promotes_to (type);
4720 if (! promoted_type)
4721 promoted_type = type;
4724 DECL_ARG_TYPE (decl) = promoted_type;
4725 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4727 else if (decl_context == FIELD)
4729 /* Structure field. It may not be a function. */
4731 if (TREE_CODE (type) == FUNCTION_TYPE)
4733 error ("field `%s' declared as a function", name);
4734 type = build_pointer_type (type);
4736 else if (TREE_CODE (type) != ERROR_MARK
4737 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4739 error ("field `%s' has incomplete type", name);
4740 type = error_mark_node;
4742 /* Move type qualifiers down to element of an array. */
4743 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4745 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4747 TYPE_DOMAIN (type));
4748 #if 0 /* Leave the field const or volatile as well. */
4749 type_quals = TYPE_UNQUALIFIED;
4752 decl = build_decl (FIELD_DECL, declarator, type);
4753 DECL_NONADDRESSABLE_P (decl) = bitfield;
4756 C_DECL_VARIABLE_SIZE (decl) = 1;
4758 else if (TREE_CODE (type) == FUNCTION_TYPE)
4760 /* Every function declaration is "external"
4761 except for those which are inside a function body
4762 in which `auto' is used.
4763 That is a case not specified by ANSI C,
4764 and we use it for forward declarations for nested functions. */
4765 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4766 || current_binding_level == global_binding_level);
4768 if (specbits & (1 << (int) RID_AUTO)
4769 && (pedantic || current_binding_level == global_binding_level))
4770 pedwarn ("invalid storage class for function `%s'", name);
4771 if (specbits & (1 << (int) RID_REGISTER))
4772 error ("invalid storage class for function `%s'", name);
4773 /* Function declaration not at top level.
4774 Storage classes other than `extern' are not allowed
4775 and `extern' makes no difference. */
4776 if (current_binding_level != global_binding_level
4777 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4779 pedwarn ("invalid storage class for function `%s'", name);
4781 decl = build_decl (FUNCTION_DECL, declarator, type);
4782 decl = build_decl_attribute_variant (decl, decl_machine_attr);
4784 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4785 pedwarn ("ANSI C forbids qualified function types");
4788 && VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl)))
4789 && TYPE_QUALS (TREE_TYPE (TREE_TYPE (decl)))
4790 && ! DECL_IN_SYSTEM_HEADER (decl))
4791 pedwarn ("ANSI C forbids qualified void function return type");
4793 /* GNU C interprets a `volatile void' return type to indicate
4794 that the function does not return. */
4795 if ((type_quals & TYPE_QUAL_VOLATILE)
4796 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4797 warning ("`noreturn' function returns non-void value");
4800 DECL_EXTERNAL (decl) = 1;
4801 /* Record absence of global scope for `static' or `auto'. */
4803 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4805 /* Record presence of `inline', if it is reasonable. */
4808 if (! strcmp (IDENTIFIER_POINTER (declarator), "main"))
4809 warning ("cannot inline function `main'");
4811 /* Assume that otherwise the function can be inlined. */
4812 DECL_INLINE (decl) = 1;
4814 if (specbits & (1 << (int) RID_EXTERN))
4815 current_extern_inline = 1;
4820 /* It's a variable. */
4821 /* An uninitialized decl with `extern' is a reference. */
4822 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4824 /* Move type qualifiers down to element of an array. */
4825 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4827 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4829 TYPE_DOMAIN (type));
4830 #if 0 /* Leave the variable const or volatile as well. */
4831 type_quals = TYPE_UNQUALIFIED;
4835 decl = build_decl (VAR_DECL, declarator, type);
4837 C_DECL_VARIABLE_SIZE (decl) = 1;
4840 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4842 DECL_EXTERNAL (decl) = extern_ref;
4843 /* At top level, the presence of a `static' or `register' storage
4844 class specifier, or the absence of all storage class specifiers
4845 makes this declaration a definition (perhaps tentative). Also,
4846 the absence of both `static' and `register' makes it public. */
4847 if (current_binding_level == global_binding_level)
4851 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
4852 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
4854 /* Not at top level, only `static' makes a static definition. */
4857 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4858 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
4861 if (specbits & 1 << (int) RID_ITERATOR)
4862 ITERATOR_P (decl) = 1;
4865 /* Record `register' declaration for warnings on &
4866 and in case doing stupid register allocation. */
4868 if (specbits & (1 << (int) RID_REGISTER))
4869 DECL_REGISTER (decl) = 1;
4871 /* Record constancy and volatility. */
4872 c_apply_type_quals_to_decl (type_quals, decl);
4874 /* If a type has volatile components, it should be stored in memory.
4875 Otherwise, the fact that those components are volatile
4876 will be ignored, and would even crash the compiler. */
4877 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4878 mark_addressable (decl);
4884 /* Decode the parameter-list info for a function type or function definition.
4885 The argument is the value returned by `get_parm_info' (or made in parse.y
4886 if there is an identifier list instead of a parameter decl list).
4887 These two functions are separate because when a function returns
4888 or receives functions then each is called multiple times but the order
4889 of calls is different. The last call to `grokparms' is always the one
4890 that contains the formal parameter names of a function definition.
4892 Store in `last_function_parms' a chain of the decls of parms.
4893 Also store in `last_function_parm_tags' a chain of the struct, union,
4894 and enum tags declared among the parms.
4896 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4898 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4899 a mere declaration. A nonempty identifier-list gets an error message
4900 when FUNCDEF_FLAG is zero. */
4903 grokparms (parms_info, funcdef_flag)
4907 tree first_parm = TREE_CHAIN (parms_info);
4909 last_function_parms = TREE_PURPOSE (parms_info);
4910 last_function_parm_tags = TREE_VALUE (parms_info);
4912 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
4913 && !in_system_header)
4914 warning ("function declaration isn't a prototype");
4917 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
4920 pedwarn ("parameter names (without types) in function declaration");
4922 last_function_parms = first_parm;
4929 /* We no longer test FUNCDEF_FLAG.
4930 If the arg types are incomplete in a declaration,
4931 they must include undefined tags.
4932 These tags can never be defined in the scope of the declaration,
4933 so the types can never be completed,
4934 and no call can be compiled successfully. */
4936 /* In a fcn definition, arg types must be complete. */
4939 for (parm = last_function_parms, typelt = first_parm;
4941 parm = TREE_CHAIN (parm))
4942 /* Skip over any enumeration constants declared here. */
4943 if (TREE_CODE (parm) == PARM_DECL)
4945 /* Barf if the parameter itself has an incomplete type. */
4946 tree type = TREE_VALUE (typelt);
4947 if (!COMPLETE_TYPE_P (type))
4949 if (funcdef_flag && DECL_NAME (parm) != 0)
4950 error ("parameter `%s' has incomplete type",
4951 IDENTIFIER_POINTER (DECL_NAME (parm)));
4953 warning ("parameter has incomplete type");
4956 TREE_VALUE (typelt) = error_mark_node;
4957 TREE_TYPE (parm) = error_mark_node;
4960 #if 0 /* This has been replaced by parm_tags_warning
4961 which uses a more accurate criterion for what to warn about. */
4964 /* Now warn if is a pointer to an incomplete type. */
4965 while (TREE_CODE (type) == POINTER_TYPE
4966 || TREE_CODE (type) == REFERENCE_TYPE)
4967 type = TREE_TYPE (type);
4968 type = TYPE_MAIN_VARIANT (type);
4969 if (!COMPLETE_TYPE_P (type))
4971 if (DECL_NAME (parm) != 0)
4972 warning ("parameter `%s' points to incomplete type",
4973 IDENTIFIER_POINTER (DECL_NAME (parm)));
4975 warning ("parameter points to incomplete type");
4979 typelt = TREE_CHAIN (typelt);
4987 /* Return a tree_list node with info on a parameter list just parsed.
4988 The TREE_PURPOSE is a chain of decls of those parms.
4989 The TREE_VALUE is a list of structure, union and enum tags defined.
4990 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
4991 This tree_list node is later fed to `grokparms'.
4993 VOID_AT_END nonzero means append `void' to the end of the type-list.
4994 Zero means the parmlist ended with an ellipsis so don't append `void'. */
4997 get_parm_info (void_at_end)
5000 register tree decl, t;
5001 register tree types = 0;
5003 tree tags = gettags ();
5004 tree parms = getdecls ();
5006 tree order = current_binding_level->parm_order;
5008 /* Just `void' (and no ellipsis) is special. There are really no parms.
5009 But if the `void' is qualified (by `const' or `volatile') or has a
5010 storage class specifier (`register'), then the behavior is undefined;
5011 by not counting it as the special case of `void' we will cause an
5012 error later. Typedefs for `void' are OK (see DR#157).
5014 if (void_at_end && parms != 0
5015 && TREE_CHAIN (parms) == 0
5016 && VOID_TYPE_P (TREE_TYPE (parms))
5017 && ! TREE_THIS_VOLATILE (parms)
5018 && ! TREE_READONLY (parms)
5019 && ! DECL_REGISTER (parms)
5020 && DECL_NAME (parms) == 0)
5023 storedecls (NULL_TREE);
5024 return tree_cons (NULL_TREE, NULL_TREE,
5025 tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5028 /* Extract enumerator values and other non-parms declared with the parms.
5029 Likewise any forward parm decls that didn't have real parm decls. */
5030 for (decl = parms; decl; )
5032 tree next = TREE_CHAIN (decl);
5034 if (TREE_CODE (decl) != PARM_DECL)
5036 TREE_CHAIN (decl) = new_parms;
5039 else if (TREE_ASM_WRITTEN (decl))
5041 error_with_decl (decl, "parameter `%s' has just a forward declaration");
5042 TREE_CHAIN (decl) = new_parms;
5048 /* Put the parm decls back in the order they were in in the parm list. */
5049 for (t = order; t; t = TREE_CHAIN (t))
5052 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5054 TREE_CHAIN (TREE_VALUE (t)) = 0;
5057 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5060 /* Store the parmlist in the binding level since the old one
5061 is no longer a valid list. (We have changed the chain pointers.) */
5062 storedecls (new_parms);
5064 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5065 /* There may also be declarations for enumerators if an enumeration
5066 type is declared among the parms. Ignore them here. */
5067 if (TREE_CODE (decl) == PARM_DECL)
5069 /* Since there is a prototype,
5070 args are passed in their declared types. */
5071 tree type = TREE_TYPE (decl);
5072 DECL_ARG_TYPE (decl) = type;
5073 if (PROMOTE_PROTOTYPES
5074 && (TREE_CODE (type) == INTEGER_TYPE
5075 || TREE_CODE (type) == ENUMERAL_TYPE)
5076 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5077 DECL_ARG_TYPE (decl) = integer_type_node;
5079 types = tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5080 if (VOID_TYPE_P (TREE_VALUE (types)) && ! erred
5081 && DECL_NAME (decl) == 0)
5083 error ("`void' in parameter list must be the entire list");
5089 return tree_cons (new_parms, tags,
5090 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
5092 return tree_cons (new_parms, tags, nreverse (types));
5095 /* At end of parameter list, warn about any struct, union or enum tags
5096 defined within. Do so because these types cannot ever become complete. */
5099 parmlist_tags_warning ()
5104 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5106 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5107 /* An anonymous union parm type is meaningful as a GNU extension.
5108 So don't warn for that. */
5109 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5111 if (TREE_PURPOSE (elt) != 0)
5112 warning ("`%s %s' declared inside parameter list",
5113 (code == RECORD_TYPE ? "struct"
5114 : code == UNION_TYPE ? "union"
5116 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5119 /* For translation these need to be seperate warnings */
5120 if (code == RECORD_TYPE)
5121 warning ("anonymous struct declared inside parameter list");
5122 else if (code == UNION_TYPE)
5123 warning ("anonymous union declared inside parameter list");
5125 warning ("anonymous enum declared inside parameter list");
5129 warning ("its scope is only this definition or declaration, which is probably not what you want.");
5135 /* Get the struct, enum or union (CODE says which) with tag NAME.
5136 Define the tag as a forward-reference if it is not defined. */
5139 xref_tag (code, name)
5140 enum tree_code code;
5143 /* If a cross reference is requested, look up the type
5144 already defined for this tag and return it. */
5146 register tree ref = lookup_tag (code, name, current_binding_level, 0);
5147 /* Even if this is the wrong type of tag, return what we found.
5148 There will be an error message anyway, from pending_xref_error.
5149 If we create an empty xref just for an invalid use of the type,
5150 the main result is to create lots of superfluous error messages. */
5154 /* If no such tag is yet defined, create a forward-reference node
5155 and record it as the "definition".
5156 When a real declaration of this type is found,
5157 the forward-reference will be altered into a real type. */
5159 ref = make_node (code);
5160 if (code == ENUMERAL_TYPE)
5162 /* (In ANSI, Enums can be referred to only if already defined.) */
5164 pedwarn ("ANSI C forbids forward references to `enum' types");
5165 /* Give the type a default layout like unsigned int
5166 to avoid crashing if it does not get defined. */
5167 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5168 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5169 TYPE_USER_ALIGN (ref) = 0;
5170 TREE_UNSIGNED (ref) = 1;
5171 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5172 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5173 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5176 pushtag (name, ref);
5181 /* Make sure that the tag NAME is defined *in the current binding level*
5182 at least as a forward reference.
5183 CODE says which kind of tag NAME ought to be. */
5186 start_struct (code, name)
5187 enum tree_code code;
5190 /* If there is already a tag defined at this binding level
5191 (as a forward reference), just return it. */
5193 register tree ref = 0;
5196 ref = lookup_tag (code, name, current_binding_level, 1);
5197 if (ref && TREE_CODE (ref) == code)
5199 C_TYPE_BEING_DEFINED (ref) = 1;
5200 TYPE_PACKED (ref) = flag_pack_struct;
5201 if (TYPE_FIELDS (ref))
5202 error ("redefinition of `%s %s'",
5203 code == UNION_TYPE ? "union" : "struct",
5204 IDENTIFIER_POINTER (name));
5209 /* Otherwise create a forward-reference just so the tag is in scope. */
5211 ref = make_node (code);
5212 pushtag (name, ref);
5213 C_TYPE_BEING_DEFINED (ref) = 1;
5214 TYPE_PACKED (ref) = flag_pack_struct;
5218 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5219 of a structure component, returning a FIELD_DECL node.
5220 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5222 This is done during the parsing of the struct declaration.
5223 The FIELD_DECL nodes are chained together and the lot of them
5224 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5227 grokfield (filename, line, declarator, declspecs, width)
5228 const char *filename ATTRIBUTE_UNUSED;
5229 int line ATTRIBUTE_UNUSED;
5230 tree declarator, declspecs, width;
5234 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5236 finish_decl (value, NULL_TREE, NULL_TREE);
5237 DECL_INITIAL (value) = width;
5239 maybe_objc_check_decl (value);
5243 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5244 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5245 ATTRIBUTES are attributes to be applied to the structure. */
5248 finish_struct (t, fieldlist, attributes)
5254 int toplevel = global_binding_level == current_binding_level;
5256 /* If this type was previously laid out as a forward reference,
5257 make sure we lay it out again. */
5261 decl_attributes (t, attributes, NULL_TREE);
5263 /* Nameless union parm types are useful as GCC extension. */
5264 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5265 /* Otherwise, warn about any struct or union def. in parmlist. */
5266 if (in_parm_level_p ())
5269 pedwarn ("%s defined inside parms",
5270 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5271 else if (! flag_traditional)
5272 warning ("%s defined inside parms",
5273 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5278 for (x = fieldlist; x; x = TREE_CHAIN (x))
5279 if (DECL_NAME (x) != 0)
5283 pedwarn ("%s has no %s",
5284 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
5285 fieldlist ? _("named members") : _("members"));
5288 /* Install struct as DECL_CONTEXT of each field decl.
5289 Also process specified field sizes,m which is found in the DECL_INITIAL.
5290 Store 0 there, except for ": 0" fields (so we can find them
5291 and delete them, below). */
5293 for (x = fieldlist; x; x = TREE_CHAIN (x))
5295 DECL_CONTEXT (x) = t;
5296 DECL_PACKED (x) |= TYPE_PACKED (t);
5298 /* If any field is const, the structure type is pseudo-const. */
5299 if (TREE_READONLY (x))
5300 C_TYPE_FIELDS_READONLY (t) = 1;
5303 /* A field that is pseudo-const makes the structure likewise. */
5304 tree t1 = TREE_TYPE (x);
5305 while (TREE_CODE (t1) == ARRAY_TYPE)
5306 t1 = TREE_TYPE (t1);
5307 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5308 && C_TYPE_FIELDS_READONLY (t1))
5309 C_TYPE_FIELDS_READONLY (t) = 1;
5312 /* Any field that is volatile means variables of this type must be
5313 treated in some ways as volatile. */
5314 if (TREE_THIS_VOLATILE (x))
5315 C_TYPE_FIELDS_VOLATILE (t) = 1;
5317 /* Any field of nominal variable size implies structure is too. */
5318 if (C_DECL_VARIABLE_SIZE (x))
5319 C_TYPE_VARIABLE_SIZE (t) = 1;
5321 /* Detect invalid nested redefinition. */
5322 if (TREE_TYPE (x) == t)
5323 error ("nested redefinition of `%s'",
5324 IDENTIFIER_POINTER (TYPE_NAME (t)));
5326 /* Detect invalid bit-field size. */
5327 if (DECL_INITIAL (x))
5328 STRIP_NOPS (DECL_INITIAL (x));
5329 if (DECL_INITIAL (x))
5331 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5332 constant_expression_warning (DECL_INITIAL (x));
5336 "bit-field `%s' width not an integer constant");
5337 DECL_INITIAL (x) = NULL;
5341 /* Detect invalid bit-field type. */
5342 if (DECL_INITIAL (x)
5343 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5344 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5346 error_with_decl (x, "bit-field `%s' has invalid type");
5347 DECL_INITIAL (x) = NULL;
5350 if (DECL_INITIAL (x) && pedantic
5351 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5352 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5353 /* Accept an enum that's equivalent to int or unsigned int. */
5354 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5355 && (TYPE_PRECISION (TREE_TYPE (x))
5356 == TYPE_PRECISION (integer_type_node))))
5357 pedwarn_with_decl (x, "bit-field `%s' type invalid in ANSI C");
5359 /* Detect and ignore out of range field width and process valid
5361 if (DECL_INITIAL (x))
5363 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5364 error_with_decl (x, "negative width in bit-field `%s'");
5365 else if (0 < compare_tree_int (DECL_INITIAL (x),
5366 TYPE_PRECISION (TREE_TYPE (x))))
5367 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5368 else if (integer_zerop (DECL_INITIAL (x)) && DECL_NAME (x) != 0)
5369 error_with_decl (x, "zero width for bit-field `%s'");
5372 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
5373 unsigned HOST_WIDE_INT width
5374 = TREE_INT_CST_LOW (DECL_INITIAL (x));
5376 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5377 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5378 TREE_UNSIGNED (TREE_TYPE (x)))
5380 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5381 TREE_UNSIGNED (TREE_TYPE (x))))))
5382 warning_with_decl (x,
5383 "`%s' is narrower than values of its type");
5385 DECL_SIZE (x) = bitsize_int (width);
5386 DECL_BIT_FIELD (x) = DECL_C_BIT_FIELD (x) = 1;
5390 /* field size 0 => force desired amount of alignment. */
5391 #ifdef EMPTY_FIELD_BOUNDARY
5392 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5394 #ifdef PCC_BITFIELD_TYPE_MATTERS
5395 if (PCC_BITFIELD_TYPE_MATTERS)
5397 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5398 TYPE_ALIGN (TREE_TYPE (x)));
5399 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5406 else if (TREE_TYPE (x) != error_mark_node)
5408 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5409 : TYPE_ALIGN (TREE_TYPE (x)));
5411 /* Non-bit-fields are aligned for their type, except packed
5412 fields which require only BITS_PER_UNIT alignment. */
5413 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5414 if (! DECL_PACKED (x))
5415 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5418 DECL_INITIAL (x) = 0;
5421 /* Delete all duplicate fields from the fieldlist */
5422 for (x = fieldlist; x && TREE_CHAIN (x);)
5423 /* Anonymous fields aren't duplicates. */
5424 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5428 register tree y = fieldlist;
5432 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5438 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5440 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5441 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5443 else x = TREE_CHAIN (x);
5446 /* Now we have the nearly final fieldlist. Record it,
5447 then lay out the structure or union (including the fields). */
5449 TYPE_FIELDS (t) = fieldlist;
5453 /* Delete all zero-width bit-fields from the fieldlist */
5455 tree *fieldlistp = &fieldlist;
5457 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5458 *fieldlistp = TREE_CHAIN (*fieldlistp);
5460 fieldlistp = &TREE_CHAIN (*fieldlistp);
5463 /* Now we have the truly final field list.
5464 Store it in this type and in the variants. */
5466 TYPE_FIELDS (t) = fieldlist;
5468 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5470 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5471 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5472 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5473 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5476 /* If this was supposed to be a transparent union, but we can't
5477 make it one, warn and turn off the flag. */
5478 if (TREE_CODE (t) == UNION_TYPE
5479 && TYPE_TRANSPARENT_UNION (t)
5480 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5482 TYPE_TRANSPARENT_UNION (t) = 0;
5483 warning ("union cannot be made transparent");
5486 /* If this structure or union completes the type of any previous
5487 variable declaration, lay it out and output its rtl. */
5489 if (current_binding_level->n_incomplete != 0)
5492 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5494 if (TREE_TYPE (decl) == t
5495 && TREE_CODE (decl) != TYPE_DECL)
5497 layout_decl (decl, 0);
5498 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5499 maybe_objc_check_decl (decl);
5500 rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0);
5503 --current_binding_level->n_incomplete;
5505 else if (!COMPLETE_TYPE_P (TREE_TYPE (decl))
5506 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5508 tree element = TREE_TYPE (decl);
5509 while (TREE_CODE (element) == ARRAY_TYPE)
5510 element = TREE_TYPE (element);
5512 layout_array_type (TREE_TYPE (decl));
5517 /* Finish debugging output for this type. */
5518 rest_of_type_compilation (t, toplevel);
5523 /* Lay out the type T, and its element type, and so on. */
5526 layout_array_type (t)
5529 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5530 layout_array_type (TREE_TYPE (t));
5534 /* Begin compiling the definition of an enumeration type.
5535 NAME is its name (or null if anonymous).
5536 Returns the type object, as yet incomplete.
5537 Also records info about it so that build_enumerator
5538 may be used to declare the individual values as they are read. */
5544 register tree enumtype = 0;
5546 /* If this is the real definition for a previous forward reference,
5547 fill in the contents in the same object that used to be the
5548 forward reference. */
5551 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5553 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5555 enumtype = make_node (ENUMERAL_TYPE);
5556 pushtag (name, enumtype);
5559 C_TYPE_BEING_DEFINED (enumtype) = 1;
5561 if (TYPE_VALUES (enumtype) != 0)
5563 /* This enum is a named one that has been declared already. */
5564 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5566 /* Completely replace its old definition.
5567 The old enumerators remain defined, however. */
5568 TYPE_VALUES (enumtype) = 0;
5571 enum_next_value = integer_zero_node;
5574 if (flag_short_enums)
5575 TYPE_PACKED (enumtype) = 1;
5580 /* After processing and defining all the values of an enumeration type,
5581 install their decls in the enumeration type and finish it off.
5582 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5583 and ATTRIBUTES are the specified attributes.
5584 Returns ENUMTYPE. */
5587 finish_enum (enumtype, values, attributes)
5592 register tree pair, tem;
5593 tree minnode = 0, maxnode = 0, enum_value_type;
5594 int precision, unsign;
5595 int toplevel = (global_binding_level == current_binding_level);
5597 if (in_parm_level_p ())
5598 warning ("enum defined inside parms");
5600 decl_attributes (enumtype, attributes, NULL_TREE);
5602 /* Calculate the maximum value of any enumerator in this type. */
5604 if (values == error_mark_node)
5605 minnode = maxnode = integer_zero_node;
5608 minnode = maxnode = TREE_VALUE (values);
5609 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5611 tree value = TREE_VALUE (pair);
5612 if (tree_int_cst_lt (maxnode, value))
5614 if (tree_int_cst_lt (value, minnode))
5619 /* Construct the final type of this enumeration. It is the same
5620 as one of the integral types - the narrowest one that fits, except
5621 that normally we only go as narrow as int - and signed iff any of
5622 the values are negative. */
5623 unsign = (tree_int_cst_sgn (minnode) >= 0);
5624 precision = MAX (min_precision (minnode, unsign),
5625 min_precision (maxnode, unsign));
5626 if (!TYPE_PACKED (enumtype))
5627 precision = MAX (precision, TYPE_PRECISION (integer_type_node));
5628 if (type_for_size (precision, unsign) == 0)
5630 warning ("enumeration values exceed range of largest integer");
5631 precision = TYPE_PRECISION (long_long_integer_type_node);
5634 if (precision == TYPE_PRECISION (integer_type_node))
5635 enum_value_type = type_for_size (precision, 0);
5637 enum_value_type = enumtype;
5639 TYPE_MIN_VALUE (enumtype) = minnode;
5640 TYPE_MAX_VALUE (enumtype) = maxnode;
5641 TYPE_PRECISION (enumtype) = precision;
5642 TREE_UNSIGNED (enumtype) = unsign;
5643 TYPE_SIZE (enumtype) = 0;
5644 layout_type (enumtype);
5646 if (values != error_mark_node)
5648 /* Change the type of the enumerators to be the enum type. We
5649 need to do this irrespective of the size of the enum, for
5650 proper type checking. Replace the DECL_INITIALs of the
5651 enumerators, and the value slots of the list, with copies
5652 that have the enum type; they cannot be modified in place
5653 because they may be shared (e.g. integer_zero_node) Finally,
5654 change the purpose slots to point to the names of the decls. */
5655 for (pair = values; pair; pair = TREE_CHAIN (pair))
5657 tree enu = TREE_PURPOSE (pair);
5659 TREE_TYPE (enu) = enumtype;
5660 DECL_SIZE (enu) = TYPE_SIZE (enumtype);
5661 DECL_SIZE_UNIT (enu) = TYPE_SIZE_UNIT (enumtype);
5662 DECL_ALIGN (enu) = TYPE_ALIGN (enumtype);
5663 DECL_USER_ALIGN (enu) = TYPE_USER_ALIGN (enumtype);
5664 DECL_MODE (enu) = TYPE_MODE (enumtype);
5666 /* The ISO C Standard mandates enumerators to have type int,
5667 even though the underlying type of an enum type is
5668 unspecified. Here we convert any enumerators that fit in
5669 an int to type int, to avoid promotions to unsigned types
5670 when comparing integers with enumerators that fit in the
5671 int range. When -pedantic is given, build_enumerator()
5672 would have already taken care of those that don't fit. */
5673 if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
5674 DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
5676 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5678 TREE_PURPOSE (pair) = DECL_NAME (enu);
5679 TREE_VALUE (pair) = DECL_INITIAL (enu);
5682 TYPE_VALUES (enumtype) = values;
5685 /* Fix up all variant types of this enum type. */
5686 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5688 if (tem == enumtype)
5690 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5691 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5692 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5693 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5694 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5695 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5696 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5697 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5698 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5699 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5702 /* Finish debugging output for this type. */
5703 rest_of_type_compilation (enumtype, toplevel);
5708 /* Build and install a CONST_DECL for one value of the
5709 current enumeration type (one that was begun with start_enum).
5710 Return a tree-list containing the CONST_DECL and its value.
5711 Assignment of sequential values by default is handled here. */
5714 build_enumerator (name, value)
5717 register tree decl, type;
5719 /* Validate and default VALUE. */
5721 /* Remove no-op casts from the value. */
5723 STRIP_TYPE_NOPS (value);
5727 if (TREE_CODE (value) == INTEGER_CST)
5729 value = default_conversion (value);
5730 constant_expression_warning (value);
5734 error ("enumerator value for `%s' not integer constant",
5735 IDENTIFIER_POINTER (name));
5740 /* Default based on previous value. */
5741 /* It should no longer be possible to have NON_LVALUE_EXPR
5745 value = enum_next_value;
5747 error ("overflow in enumeration values");
5750 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5752 pedwarn ("ANSI C restricts enumerator values to range of `int'");
5753 value = convert (integer_type_node, value);
5756 /* Set basis for default for next value. */
5757 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5758 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5760 /* Now create a declaration for the enum value name. */
5762 type = TREE_TYPE (value);
5763 type = type_for_size (MAX (TYPE_PRECISION (type),
5764 TYPE_PRECISION (integer_type_node)),
5766 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
5767 && TREE_UNSIGNED (type)));
5769 decl = build_decl (CONST_DECL, name, type);
5770 DECL_INITIAL (decl) = convert (type, value);
5773 return tree_cons (decl, value, NULL_TREE);
5776 /* Create the FUNCTION_DECL for a function definition.
5777 DECLSPECS, DECLARATOR, PREFIX_ATTRIBUTES and ATTRIBUTES are the parts of
5778 the declaration; they describe the function's name and the type it returns,
5779 but twisted together in a fashion that parallels the syntax of C.
5781 This function creates a binding context for the function body
5782 as well as setting up the FUNCTION_DECL in current_function_decl.
5784 Returns 1 on success. If the DECLARATOR is not suitable for a function
5785 (it defines a datum instead), we return 0, which tells
5786 yyparse to report a parse error. */
5789 start_function (declspecs, declarator, prefix_attributes, attributes)
5790 tree declarator, declspecs, prefix_attributes, attributes;
5792 tree decl1, old_decl;
5794 int old_immediate_size_expand = immediate_size_expand;
5796 current_function_returns_value = 0; /* Assume, until we see it does. */
5797 current_function_returns_null = 0;
5798 warn_about_return_type = 0;
5799 current_extern_inline = 0;
5800 c_function_varargs = 0;
5802 shadowed_labels = 0;
5804 /* Don't expand any sizes in the return type of the function. */
5805 immediate_size_expand = 0;
5807 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
5809 /* If the declarator is not suitable for a function definition,
5810 cause a syntax error. */
5813 immediate_size_expand = old_immediate_size_expand;
5817 decl_attributes (decl1, prefix_attributes, attributes);
5819 announce_function (decl1);
5821 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5823 error ("return type is an incomplete type");
5824 /* Make it return void instead. */
5826 = build_function_type (void_type_node,
5827 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5830 if (warn_about_return_type)
5831 pedwarn_c99 ("return type defaults to `int'");
5833 /* Save the parm names or decls from this function's declarator
5834 where store_parm_decls will find them. */
5835 current_function_parms = last_function_parms;
5836 current_function_parm_tags = last_function_parm_tags;
5838 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5839 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5840 DECL_INITIAL (decl1) = error_mark_node;
5842 /* If this definition isn't a prototype and we had a prototype declaration
5843 before, copy the arg type info from that prototype.
5844 But not if what we had before was a builtin function. */
5845 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5846 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5847 && !DECL_BUILT_IN (old_decl)
5848 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5849 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5850 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5852 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5853 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
5854 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
5857 /* If there is no explicit declaration, look for any out-of-scope implicit
5860 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
5862 /* Optionally warn of old-fashioned def with no previous prototype. */
5863 if (warn_strict_prototypes
5864 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5865 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
5866 warning ("function declaration isn't a prototype");
5867 /* Optionally warn of any global def with no previous prototype. */
5868 else if (warn_missing_prototypes
5869 && TREE_PUBLIC (decl1)
5870 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0)
5871 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
5872 warning_with_decl (decl1, "no previous prototype for `%s'");
5873 /* Optionally warn of any def with no previous prototype
5874 if the function has already been used. */
5875 else if (warn_missing_prototypes
5876 && old_decl != 0 && TREE_USED (old_decl)
5877 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5878 warning_with_decl (decl1,
5879 "`%s' was used with no prototype before its definition");
5880 /* Optionally warn of any global def with no previous declaration. */
5881 else if (warn_missing_declarations
5882 && TREE_PUBLIC (decl1)
5884 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
5885 warning_with_decl (decl1, "no previous declaration for `%s'");
5886 /* Optionally warn of any def with no previous declaration
5887 if the function has already been used. */
5888 else if (warn_missing_declarations
5889 && old_decl != 0 && TREE_USED (old_decl)
5890 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
5891 warning_with_decl (decl1,
5892 "`%s' was used with no declaration before its definition");
5894 /* This is a definition, not a reference.
5895 So normally clear DECL_EXTERNAL.
5896 However, `extern inline' acts like a declaration
5897 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5898 DECL_EXTERNAL (decl1) = current_extern_inline;
5900 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
5901 SET_DEFAULT_DECL_ATTRIBUTES (decl1, attributes);
5904 /* This function exists in static storage.
5905 (This does not mean `static' in the C sense!) */
5906 TREE_STATIC (decl1) = 1;
5908 /* A nested function is not global. */
5909 if (current_function_decl != 0)
5910 TREE_PUBLIC (decl1) = 0;
5912 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5914 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))) == 0)
5919 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5920 != integer_type_node)
5921 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
5923 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
5924 args = TREE_CHAIN (args))
5926 tree type = args ? TREE_VALUE (args) : 0;
5928 if (type == void_type_node)
5935 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
5936 pedwarn_with_decl (decl1,
5937 "first argument of `%s' should be `int'");
5941 if (TREE_CODE (type) != POINTER_TYPE
5942 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5943 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5945 pedwarn_with_decl (decl1,
5946 "second argument of `%s' should be `char **'");
5950 if (TREE_CODE (type) != POINTER_TYPE
5951 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5952 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5954 pedwarn_with_decl (decl1,
5955 "third argument of `%s' should probably be `char **'");
5960 /* It is intentional that this message does not mention the third
5961 argument, which is warned for only pedantically, because it's
5962 blessed by mention in an appendix of the standard. */
5963 if (argct > 0 && (argct < 2 || argct > 3))
5964 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
5966 if (argct == 3 && pedantic)
5967 pedwarn_with_decl (decl1, "third argument of `%s' is deprecated");
5969 if (! TREE_PUBLIC (decl1))
5970 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
5973 /* Record the decl so that the function name is defined.
5974 If we already have a decl for this name, and it is a FUNCTION_DECL,
5975 use the old decl. */
5977 current_function_decl = pushdecl (decl1);
5980 declare_parm_level (1);
5981 current_binding_level->subblocks_tag_transparent = 1;
5983 make_function_rtl (current_function_decl);
5985 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5986 /* Promote the value to int before returning it. */
5987 if (C_PROMOTING_INTEGER_TYPE_P (restype))
5989 /* It retains unsignedness if traditional
5990 or if not really getting wider. */
5991 if (TREE_UNSIGNED (restype)
5992 && (flag_traditional
5993 || (TYPE_PRECISION (restype)
5994 == TYPE_PRECISION (integer_type_node))))
5995 restype = unsigned_type_node;
5997 restype = integer_type_node;
5999 DECL_RESULT (current_function_decl)
6000 = build_decl (RESULT_DECL, NULL_TREE, restype);
6002 /* If this fcn was already referenced via a block-scope `extern' decl
6003 (or an implicit decl), propagate certain information about the usage. */
6004 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6005 TREE_ADDRESSABLE (current_function_decl) = 1;
6007 immediate_size_expand = old_immediate_size_expand;
6012 /* Record that this function is going to be a varargs function.
6013 This is called before store_parm_decls, which is too early
6014 to call mark_varargs directly. */
6019 c_function_varargs = 1;
6022 /* Store the parameter declarations into the current function declaration.
6023 This is called after parsing the parameter declarations, before
6024 digesting the body of the function.
6026 For an old-style definition, modify the function's type
6027 to specify at least the number of arguments. */
6032 register tree fndecl = current_function_decl;
6035 /* This is either a chain of PARM_DECLs (if a prototype was used)
6036 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6037 tree specparms = current_function_parms;
6039 /* This is a list of types declared among parms in a prototype. */
6040 tree parmtags = current_function_parm_tags;
6042 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6043 register tree parmdecls = getdecls ();
6045 /* This is a chain of any other decls that came in among the parm
6046 declarations. If a parm is declared with enum {foo, bar} x;
6047 then CONST_DECLs for foo and bar are put here. */
6050 /* Nonzero if this definition is written with a prototype. */
6053 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6055 /* This case is when the function was defined with an ANSI prototype.
6056 The parms already have decls, so we need not do anything here
6057 except record them as in effect
6058 and complain if any redundant old-style parm decls were written. */
6069 error_with_decl (fndecl,
6070 "parm types given both in parmlist and separately");
6071 /* Get rid of the erroneous decls; don't keep them on
6072 the list of parms, since they might not be PARM_DECLs. */
6073 for (decl = current_binding_level->names;
6074 decl; decl = TREE_CHAIN (decl))
6075 if (DECL_NAME (decl))
6076 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6077 for (link = current_binding_level->shadowed;
6078 link; link = TREE_CHAIN (link))
6079 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6080 current_binding_level->names = 0;
6081 current_binding_level->shadowed = 0;
6084 specparms = nreverse (specparms);
6085 for (parm = specparms; parm; parm = next)
6087 next = TREE_CHAIN (parm);
6088 if (TREE_CODE (parm) == PARM_DECL)
6090 if (DECL_NAME (parm) == 0)
6091 error_with_decl (parm, "parameter name omitted");
6092 else if (TREE_CODE (TREE_TYPE (parm)) != ERROR_MARK
6093 && VOID_TYPE_P (TREE_TYPE (parm)))
6095 error_with_decl (parm, "parameter `%s' declared void");
6096 /* Change the type to error_mark_node so this parameter
6097 will be ignored by assign_parms. */
6098 TREE_TYPE (parm) = error_mark_node;
6104 /* If we find an enum constant or a type tag,
6105 put it aside for the moment. */
6106 TREE_CHAIN (parm) = 0;
6107 others = chainon (others, parm);
6111 /* Get the decls in their original chain order
6112 and record in the function. */
6113 DECL_ARGUMENTS (fndecl) = getdecls ();
6116 /* If this function takes a variable number of arguments,
6117 add a phony parameter to the end of the parm list,
6118 to represent the position of the first unnamed argument. */
6119 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6122 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6123 /* Let's hope the address of the unnamed parm
6124 won't depend on its type. */
6125 TREE_TYPE (dummy) = integer_type_node;
6126 DECL_ARG_TYPE (dummy) = integer_type_node;
6127 DECL_ARGUMENTS (fndecl)
6128 = chainon (DECL_ARGUMENTS (fndecl), dummy);
6132 /* Now pushdecl the enum constants. */
6133 for (parm = others; parm; parm = next)
6135 next = TREE_CHAIN (parm);
6136 if (DECL_NAME (parm) == 0)
6138 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6140 else if (TREE_CODE (parm) != PARM_DECL)
6144 storetags (chainon (parmtags, gettags ()));
6148 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6149 each with a parm name as the TREE_VALUE.
6151 PARMDECLS is a chain of declarations for parameters.
6152 Warning! It can also contain CONST_DECLs which are not parameters
6153 but are names of enumerators of any enum types
6154 declared among the parameters.
6156 First match each formal parameter name with its declaration.
6157 Associate decls with the names and store the decls
6158 into the TREE_PURPOSE slots. */
6160 /* We use DECL_WEAK as a flag to show which parameters have been
6161 seen already since it is not used on PARM_DECL or CONST_DECL. */
6162 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6163 DECL_WEAK (parm) = 0;
6165 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6167 register tree tail, found = NULL;
6169 if (TREE_VALUE (parm) == 0)
6171 error_with_decl (fndecl,
6172 "parameter name missing from parameter list");
6173 TREE_PURPOSE (parm) = 0;
6177 /* See if any of the parmdecls specifies this parm by name.
6178 Ignore any enumerator decls. */
6179 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6180 if (DECL_NAME (tail) == TREE_VALUE (parm)
6181 && TREE_CODE (tail) == PARM_DECL)
6187 /* If declaration already marked, we have a duplicate name.
6188 Complain, and don't use this decl twice. */
6189 if (found && DECL_WEAK (found))
6191 error_with_decl (found, "multiple parameters named `%s'");
6195 /* If the declaration says "void", complain and ignore it. */
6196 if (found && VOID_TYPE_P (TREE_TYPE (found)))
6198 error_with_decl (found, "parameter `%s' declared void");
6199 TREE_TYPE (found) = integer_type_node;
6200 DECL_ARG_TYPE (found) = integer_type_node;
6201 layout_decl (found, 0);
6204 /* Traditionally, a parm declared float is actually a double. */
6205 if (found && flag_traditional
6206 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6208 TREE_TYPE (found) = double_type_node;
6209 DECL_ARG_TYPE (found) = double_type_node;
6210 layout_decl (found, 0);
6213 /* If no declaration found, default to int. */
6216 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6218 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6219 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6220 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6222 pedwarn_with_decl (found, "type of `%s' defaults to `int'");
6223 else if (extra_warnings)
6224 warning_with_decl (found, "type of `%s' defaults to `int'");
6228 TREE_PURPOSE (parm) = found;
6230 /* Mark this decl as "already found" */
6231 DECL_WEAK (found) = 1;
6234 /* Put anything which is on the parmdecls chain and which is
6235 not a PARM_DECL onto the list NONPARMS. (The types of
6236 non-parm things which might appear on the list include
6237 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6238 any actual PARM_DECLs not matched with any names. */
6241 for (parm = parmdecls; parm; )
6243 tree next = TREE_CHAIN (parm);
6244 TREE_CHAIN (parm) = 0;
6246 if (TREE_CODE (parm) != PARM_DECL)
6247 nonparms = chainon (nonparms, parm);
6250 /* Complain about args with incomplete types. */
6251 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6253 error_with_decl (parm, "parameter `%s' has incomplete type");
6254 TREE_TYPE (parm) = error_mark_node;
6257 if (! DECL_WEAK (parm))
6259 error_with_decl (parm,
6260 "declaration for parameter `%s' but no such parameter");
6261 /* Pretend the parameter was not missing.
6262 This gets us to a standard state and minimizes
6263 further error messages. */
6265 = chainon (specparms,
6266 tree_cons (parm, NULL_TREE, NULL_TREE));
6273 /* Chain the declarations together in the order of the list of names. */
6274 /* Store that chain in the function decl, replacing the list of names. */
6276 DECL_ARGUMENTS (fndecl) = 0;
6279 for (last = 0; parm; parm = TREE_CHAIN (parm))
6280 if (TREE_PURPOSE (parm))
6283 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6285 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6286 last = TREE_PURPOSE (parm);
6287 TREE_CHAIN (last) = 0;
6291 /* If there was a previous prototype,
6292 set the DECL_ARG_TYPE of each argument according to
6293 the type previously specified, and report any mismatches. */
6295 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6298 for (parm = DECL_ARGUMENTS (fndecl),
6299 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6300 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6301 != void_type_node));
6302 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6304 if (parm == 0 || type == 0
6305 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6307 error ("number of arguments doesn't match prototype");
6308 error_with_file_and_line (current_function_prototype_file,
6309 current_function_prototype_line,
6310 "prototype declaration");
6313 /* Type for passing arg must be consistent
6314 with that declared for the arg. */
6315 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
6317 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6318 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6320 /* Adjust argument to match prototype. E.g. a previous
6321 `int foo(float);' prototype causes
6322 `int foo(x) float x; {...}' to be treated like
6323 `int foo(float x) {...}'. This is particularly
6324 useful for argument types like uid_t. */
6325 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6327 if (PROMOTE_PROTOTYPES
6328 && (TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
6329 || TREE_CODE (TREE_TYPE (parm)) == ENUMERAL_TYPE)
6330 && TYPE_PRECISION (TREE_TYPE (parm))
6331 < TYPE_PRECISION (integer_type_node))
6332 DECL_ARG_TYPE (parm) = integer_type_node;
6336 pedwarn ("promoted argument `%s' doesn't match prototype",
6337 IDENTIFIER_POINTER (DECL_NAME (parm)));
6338 warning_with_file_and_line
6339 (current_function_prototype_file,
6340 current_function_prototype_line,
6341 "prototype declaration");
6344 /* If -traditional, allow `int' argument to match
6345 `unsigned' prototype. */
6346 else if (! (flag_traditional
6347 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6348 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6350 error ("argument `%s' doesn't match prototype",
6351 IDENTIFIER_POINTER (DECL_NAME (parm)));
6352 error_with_file_and_line (current_function_prototype_file,
6353 current_function_prototype_line,
6354 "prototype declaration");
6358 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6361 /* Otherwise, create a prototype that would match. */
6365 tree actual = 0, last = 0, type;
6367 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6369 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6371 TREE_CHAIN (last) = type;
6376 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6378 TREE_CHAIN (last) = type;
6382 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6383 of the type of this function, but we need to avoid having this
6384 affect the types of other similarly-typed functions, so we must
6385 first force the generation of an identical (but separate) type
6386 node for the relevant function type. The new node we create
6387 will be a variant of the main variant of the original function
6390 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6392 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6395 /* Now store the final chain of decls for the arguments
6396 as the decl-chain of the current lexical scope.
6397 Put the enumerators in as well, at the front so that
6398 DECL_ARGUMENTS is not modified. */
6400 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6403 /* Make sure the binding level for the top of the function body
6404 gets a BLOCK if there are any in the function.
6405 Otherwise, the dbx output is wrong. */
6407 keep_next_if_subblocks = 1;
6409 /* ??? This might be an improvement,
6410 but needs to be thought about some more. */
6412 keep_next_level_flag = 1;
6415 /* Write a record describing this function definition to the prototypes
6416 file (if requested). */
6418 gen_aux_info_record (fndecl, 1, 0, prototype);
6420 /* Initialize the RTL code for the function. */
6422 init_function_start (fndecl, input_filename, lineno);
6424 /* If this is a varargs function, inform function.c. */
6426 if (c_function_varargs)
6429 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
6431 declare_function_name ();
6433 /* Set up parameters and prepare for return, for the function. */
6435 expand_function_start (fndecl, 0);
6437 /* If this function is `main', emit a call to `__main'
6438 to run global initializers, etc. */
6439 if (DECL_NAME (fndecl)
6440 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main") == 0
6441 && DECL_CONTEXT (fndecl) == NULL_TREE)
6442 expand_main_function ();
6445 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6446 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6447 stands for an ellipsis in the identifier list.
6449 PARMLIST is the data returned by get_parm_info for the
6450 parmlist that follows the semicolon.
6452 We return a value of the same sort that get_parm_info returns,
6453 except that it describes the combination of identifiers and parmlist. */
6456 combine_parm_decls (specparms, parmlist, void_at_end)
6457 tree specparms, parmlist;
6460 register tree fndecl = current_function_decl;
6463 tree parmdecls = TREE_PURPOSE (parmlist);
6465 /* This is a chain of any other decls that came in among the parm
6466 declarations. They were separated already by get_parm_info,
6467 so we just need to keep them separate. */
6468 tree nonparms = TREE_VALUE (parmlist);
6472 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6473 DECL_WEAK (parm) = 0;
6475 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6477 register tree tail, found = NULL;
6479 /* See if any of the parmdecls specifies this parm by name. */
6480 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6481 if (DECL_NAME (tail) == TREE_VALUE (parm))
6487 /* If declaration already marked, we have a duplicate name.
6488 Complain, and don't use this decl twice. */
6489 if (found && DECL_WEAK (found))
6491 error_with_decl (found, "multiple parameters named `%s'");
6495 /* If the declaration says "void", complain and ignore it. */
6496 if (found && VOID_TYPE_P (TREE_TYPE (found)))
6498 error_with_decl (found, "parameter `%s' declared void");
6499 TREE_TYPE (found) = integer_type_node;
6500 DECL_ARG_TYPE (found) = integer_type_node;
6501 layout_decl (found, 0);
6504 /* Traditionally, a parm declared float is actually a double. */
6505 if (found && flag_traditional
6506 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6508 TREE_TYPE (found) = double_type_node;
6509 DECL_ARG_TYPE (found) = double_type_node;
6510 layout_decl (found, 0);
6513 /* If no declaration found, default to int. */
6516 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6518 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6519 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6520 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6521 error_with_decl (found, "type of parameter `%s' is not declared");
6525 TREE_PURPOSE (parm) = found;
6527 /* Mark this decl as "already found". */
6528 DECL_WEAK (found) = 1;
6531 /* Complain about any actual PARM_DECLs not matched with any names. */
6533 for (parm = parmdecls; parm; )
6535 tree next = TREE_CHAIN (parm);
6536 TREE_CHAIN (parm) = 0;
6538 /* Complain about args with incomplete types. */
6539 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6541 error_with_decl (parm, "parameter `%s' has incomplete type");
6542 TREE_TYPE (parm) = error_mark_node;
6545 if (! DECL_WEAK (parm))
6547 error_with_decl (parm,
6548 "declaration for parameter `%s' but no such parameter");
6549 /* Pretend the parameter was not missing.
6550 This gets us to a standard state and minimizes
6551 further error messages. */
6553 = chainon (specparms,
6554 tree_cons (parm, NULL_TREE, NULL_TREE));
6560 /* Chain the declarations together in the order of the list of names.
6561 At the same time, build up a list of their types, in reverse order. */
6567 for (last = 0; parm; parm = TREE_CHAIN (parm))
6568 if (TREE_PURPOSE (parm))
6571 parmdecls = TREE_PURPOSE (parm);
6573 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6574 last = TREE_PURPOSE (parm);
6575 TREE_CHAIN (last) = 0;
6577 types = tree_cons (NULL_TREE, TREE_TYPE (parm), types);
6582 return tree_cons (parmdecls, nonparms,
6583 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
6585 return tree_cons (parmdecls, nonparms, nreverse (types));
6588 /* Finish up a function declaration and compile that function
6589 all the way to assembler language output. The free the storage
6590 for the function definition.
6592 This is called after parsing the body of the function definition.
6594 NESTED is nonzero if the function being finished is nested in another. */
6597 finish_function (nested)
6600 register tree fndecl = current_function_decl;
6602 /* TREE_READONLY (fndecl) = 1;
6603 This caused &foo to be of type ptr-to-const-function
6604 which then got a warning when stored in a ptr-to-function variable. */
6607 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6609 /* Must mark the RESULT_DECL as being in this function. */
6611 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6613 /* Obey `register' declarations if `setjmp' is called in this fn. */
6614 if (flag_traditional && current_function_calls_setjmp)
6616 setjmp_protect (DECL_INITIAL (fndecl));
6617 setjmp_protect_args ();
6620 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main")
6623 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6624 != integer_type_node)
6626 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6627 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6629 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
6633 #ifdef DEFAULT_MAIN_RETURN
6634 /* Make it so that `main' always returns success by default. */
6635 DEFAULT_MAIN_RETURN;
6638 c_expand_return (integer_zero_node);
6643 /* Generate rtl for function exit. */
6644 expand_function_end (input_filename, lineno, 0);
6646 /* So we can tell if jump_optimize sets it to 1. */
6649 /* If this is a nested function, protect the local variables in the stack
6650 above us from being collected while we're compiling this function. */
6652 ggc_push_context ();
6654 /* Run the optimizers and output the assembler code for this function. */
6655 rest_of_compilation (fndecl);
6657 /* Undo the GC context switch. */
6661 current_function_returns_null |= can_reach_end;
6663 if (warn_missing_noreturn
6664 && !TREE_THIS_VOLATILE (fndecl)
6665 && !current_function_returns_null
6666 && !current_function_returns_value)
6667 warning ("function might be possible candidate for attribute `noreturn'");
6669 if (TREE_THIS_VOLATILE (fndecl) && current_function_returns_null)
6670 warning ("`noreturn' function does return");
6671 else if (warn_return_type && can_reach_end
6672 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (fndecl))))
6673 /* If this function returns non-void and control can drop through,
6675 warning ("control reaches end of non-void function");
6676 /* With just -W, complain only if function returns both with
6677 and without a value. */
6678 else if (extra_warnings
6679 && current_function_returns_value && current_function_returns_null)
6680 warning ("this function may return with or without a value");
6682 /* If requested, warn about function definitions where the function will
6683 return a value (usually of some struct or union type) which itself will
6684 take up a lot of stack space. */
6686 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6688 tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6690 if (ret_type && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST
6691 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type),
6694 unsigned int size_as_int
6695 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type));
6697 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0)
6698 warning_with_decl (fndecl,
6699 "size of return value of `%s' is %u bytes",
6702 warning_with_decl (fndecl,
6703 "size of return value of `%s' is larger than %d bytes",
6708 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested)
6710 /* Stop pointing to the local nodes about to be freed.
6711 But DECL_INITIAL must remain nonzero so we know this
6712 was an actual function definition.
6713 For a nested function, this is done in pop_c_function_context.
6714 If rest_of_compilation set this to 0, leave it 0. */
6715 if (DECL_INITIAL (fndecl) != 0)
6716 DECL_INITIAL (fndecl) = error_mark_node;
6718 DECL_ARGUMENTS (fndecl) = 0;
6721 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6723 #ifndef ASM_OUTPUT_CONSTRUCTOR
6724 if (! flag_gnu_linker)
6725 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6728 assemble_constructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl)));
6731 if (DECL_STATIC_DESTRUCTOR (fndecl))
6733 #ifndef ASM_OUTPUT_DESTRUCTOR
6734 if (! flag_gnu_linker)
6735 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6738 assemble_destructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl)));
6743 /* Let the error reporting routines know that we're outside a
6744 function. For a nested function, this value is used in
6745 pop_c_function_context and then reset via pop_function_context. */
6746 current_function_decl = NULL;
6750 /* Save and restore the variables in this file and elsewhere
6751 that keep track of the progress of compilation of the current function.
6752 Used for nested functions. */
6754 struct language_function
6757 tree shadowed_labels;
6760 int warn_about_return_type;
6762 struct binding_level *binding_level;
6765 /* Save and reinitialize the variables
6766 used during compilation of a C function. */
6769 push_c_function_context (f)
6772 struct language_function *p;
6773 p = (struct language_function *) xmalloc (sizeof (struct language_function));
6776 p->named_labels = named_labels;
6777 p->shadowed_labels = shadowed_labels;
6778 p->returns_value = current_function_returns_value;
6779 p->returns_null = current_function_returns_null;
6780 p->warn_about_return_type = warn_about_return_type;
6781 p->extern_inline = current_extern_inline;
6782 p->binding_level = current_binding_level;
6785 /* Restore the variables used during compilation of a C function. */
6788 pop_c_function_context (f)
6791 struct language_function *p = f->language;
6794 /* Bring back all the labels that were shadowed. */
6795 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
6796 if (DECL_NAME (TREE_VALUE (link)) != 0)
6797 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
6798 = TREE_VALUE (link);
6800 if (DECL_SAVED_INSNS (current_function_decl) == 0)
6802 /* Stop pointing to the local nodes about to be freed. */
6803 /* But DECL_INITIAL must remain nonzero so we know this
6804 was an actual function definition. */
6805 DECL_INITIAL (current_function_decl) = error_mark_node;
6806 DECL_ARGUMENTS (current_function_decl) = 0;
6809 named_labels = p->named_labels;
6810 shadowed_labels = p->shadowed_labels;
6811 current_function_returns_value = p->returns_value;
6812 current_function_returns_null = p->returns_null;
6813 warn_about_return_type = p->warn_about_return_type;
6814 current_extern_inline = p->extern_inline;
6815 current_binding_level = p->binding_level;
6821 /* Mark the language specific parts of F for GC. */
6823 mark_c_function_context (f)
6826 struct language_function *p = f->language;
6831 ggc_mark_tree (p->shadowed_labels);
6832 ggc_mark_tree (p->named_labels);
6833 mark_binding_level (&p->binding_level);
6836 /* integrate_decl_tree calls this function, but since we don't use the
6837 DECL_LANG_SPECIFIC field, this is a no-op. */
6840 copy_lang_decl (node)
6841 tree node ATTRIBUTE_UNUSED;
6845 /* Mark ARG for GC. */
6847 lang_mark_false_label_stack (arg)
6848 struct label_node *arg;
6850 /* C doesn't use false_label_stack. It better be NULL. */
6855 /* Mark the language specific bits in T for GC. */
6860 if (TREE_CODE (t) == IDENTIFIER_NODE)
6862 struct lang_identifier *i = (struct lang_identifier *) t;
6863 ggc_mark_tree (i->global_value);
6864 ggc_mark_tree (i->local_value);
6865 ggc_mark_tree (i->label_value);
6866 ggc_mark_tree (i->implicit_decl);
6867 ggc_mark_tree (i->error_locus);
6868 ggc_mark_tree (i->limbo_value);
6870 else if (TYPE_P (t) && TYPE_LANG_SPECIFIC (t))
6871 ggc_mark (TYPE_LANG_SPECIFIC (t));
6874 /* The functions below are required for functionality of doing
6875 function at once processing in the C front end. Currently these
6876 functions are not called from anywhere in the C front end, but as
6877 these changes continue, that will change. */
6879 /* Returns non-zero if the current statement is a full expression,
6880 i.e. temporaries created during that statement should be destroyed
6881 at the end of the statement. */
6884 stmts_are_full_exprs_p ()
6889 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6893 anon_aggr_type_p (node)
6894 tree node ATTRIBUTE_UNUSED;
6899 /* One if we have already declared __FUNCTION__ (and related
6900 variables) in the current function. Two if we are in the process
6904 current_function_name_declared ()
6910 /* Code to generate the RTL for a case label in C. */
6913 do_case (low_value, high_value)
6917 tree value1 = NULL_TREE, value2 = NULL_TREE, label;
6919 if (low_value != NULL_TREE)
6920 value1 = check_case_value (low_value);
6921 if (high_value != NULL_TREE)
6922 value2 = check_case_value (high_value);
6924 label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
6926 if (pedantic && (high_value != NULL_TREE))
6927 pedwarn ("ANSI C forbids case ranges");
6929 if (value1 != error_mark_node && value2 != error_mark_node)
6934 if (high_value == NULL_TREE && value1 != NULL_TREE &&
6935 pedantic && ! INTEGRAL_TYPE_P (TREE_TYPE (value1)))
6936 pedwarn ("label must have integral type in ANSI C");
6938 if (low_value == NULL_TREE)
6939 success = pushcase (NULL_TREE, 0, label, &duplicate);
6940 else if (high_value == NULL_TREE)
6941 success = pushcase (value1, convert_and_check, label,
6944 success = pushcase_range (value1, value2, convert_and_check,
6949 if (low_value == NULL_TREE)
6950 error ("default label not within a switch statement");
6952 error ("case label not within a switch statement");
6954 else if (success == 2) {
6955 if (low_value == NULL_TREE)
6957 error ("multiple default labels in one switch");
6958 error_with_decl (duplicate, "this is the first default label");
6961 error ("dupicate case value");
6962 if (high_value != NULL_TREE)
6963 error_with_decl (duplicate, "this is the first entry for that value");
6965 else if (low_value != NULL_TREE)
6968 warning ("case value out of range");
6969 else if (success == 5)
6970 error ("case label within scope of cleanup or variable array");
6975 /* Language specific handler of tree nodes used when generating RTL
6979 lang_expand_stmt (t)
6980 tree t ATTRIBUTE_UNUSED;
6986 /* Accessor to set the 'current_function_name_declared' flag. */
6989 set_current_function_name_declared (i)
6990 int i ATTRIBUTE_UNUSED;