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. */
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
47 extern cpp_reader parse_in;
50 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
52 { NORMAL, /* Ordinary declaration */
53 FUNCDEF, /* Function definition */
54 PARM, /* Declaration of parm before function body */
55 FIELD, /* Declaration inside struct or union */
56 BITFIELD, /* Likewise but with specified width */
57 TYPENAME}; /* Typename (inside cast or sizeof) */
59 /* We let tm.h override the types used here, to handle trivial differences
60 such as the choice of unsigned int or long unsigned int for size_t.
61 When machines start needing nontrivial differences in the size type,
62 it would be best to do something here to figure out automatically
63 from other information what type to use. */
66 #define SIZE_TYPE "long unsigned int"
70 #define PTRDIFF_TYPE "long int"
74 #define WCHAR_TYPE "int"
78 #define WINT_TYPE "unsigned int"
84 /* Nonzero if we have seen an invalid cross reference
85 to a struct, union, or enum, but not yet printed the message. */
87 tree pending_invalid_xref;
88 /* File and line to appear in the eventual error message. */
89 const char *pending_invalid_xref_file;
90 int pending_invalid_xref_line;
92 /* While defining an enum type, this is 1 plus the last enumerator
93 constant value. Note that will do not have to save this or `enum_overflow'
94 around nested function definition since such a definition could only
95 occur in an enum value expression and we don't use these variables in
98 static tree enum_next_value;
100 /* Nonzero means that there was overflow computing enum_next_value. */
102 static int enum_overflow;
104 /* Parsing a function declarator leaves a list of parameter names
105 or a chain or parameter decls here. */
107 static tree last_function_parms;
109 /* Parsing a function declarator leaves here a chain of structure
110 and enum types declared in the parmlist. */
112 static tree last_function_parm_tags;
114 /* After parsing the declarator that starts a function definition,
115 `start_function' puts here the list of parameter names or chain of decls.
116 `store_parm_decls' finds it here. */
118 static tree current_function_parms;
120 /* Similar, for last_function_parm_tags. */
121 static tree current_function_parm_tags;
123 /* Similar, for the file and line that the prototype came from if this is
124 an old-style definition. */
125 static const char *current_function_prototype_file;
126 static int current_function_prototype_line;
128 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
129 that have names. Here so we can clear out their names' definitions
130 at the end of the function. */
132 static tree named_labels;
134 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
136 static tree shadowed_labels;
138 /* Nonzero when store_parm_decls is called indicates a varargs function.
139 Value not meaningful after store_parm_decls. */
141 static int c_function_varargs;
143 /* Set to 0 at beginning of a function definition, set to 1 if
144 a return statement that specifies a return value is seen. */
146 int current_function_returns_value;
148 /* Set to 0 at beginning of a function definition, set to 1 if
149 a return statement with no argument is seen. */
151 int current_function_returns_null;
153 /* Set to nonzero by `grokdeclarator' for a function
154 whose return type is defaulted, if warnings for this are desired. */
156 static int warn_about_return_type;
158 /* Nonzero when starting a function declared `extern inline'. */
160 static int current_extern_inline;
162 /* For each binding contour we allocate a binding_level structure
163 * which records the names defined in that contour.
166 * 1) one for each function definition,
167 * where internal declarations of the parameters appear.
168 * 2) one for each compound statement,
169 * to record its declarations.
171 * The current meaning of a name can be found by searching the levels from
172 * the current one out to the global one.
175 /* Note that the information in the `names' component of the global contour
176 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
180 /* A chain of _DECL nodes for all variables, constants, functions,
181 and typedef types. These are in the reverse of the order supplied.
185 /* A list of structure, union and enum definitions,
186 * for looking up tag names.
187 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
188 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
189 * or ENUMERAL_TYPE node.
193 /* For each level, a list of shadowed outer-level local definitions
194 to be restored when this level is popped.
195 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
196 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
199 /* For each level (except not the global one),
200 a chain of BLOCK nodes for all the levels
201 that were entered and exited one level down. */
204 /* The BLOCK node for this level, if one has been preallocated.
205 If 0, the BLOCK is allocated (if needed) when the level is popped. */
208 /* The binding level which this one is contained in (inherits from). */
209 struct binding_level *level_chain;
211 /* Nonzero for the level that holds the parameters of a function. */
214 /* Nonzero if this level "doesn't exist" for tags. */
215 char tag_transparent;
217 /* Nonzero if sublevels of this level "don't exist" for tags.
218 This is set in the parm level of a function definition
219 while reading the function body, so that the outermost block
220 of the function body will be tag-transparent. */
221 char subblocks_tag_transparent;
223 /* Nonzero means make a BLOCK for this level regardless of all else. */
226 /* Nonzero means make a BLOCK if this level has any subblocks. */
227 char keep_if_subblocks;
229 /* Number of decls in `names' that have incomplete
230 structure or union types. */
233 /* A list of decls giving the (reversed) specified order of parms,
234 not including any forward-decls in the parmlist.
235 This is so we can put the parms in proper order for assign_parms. */
239 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
241 /* The binding level currently in effect. */
243 static struct binding_level *current_binding_level;
245 /* A chain of binding_level structures awaiting reuse. */
247 static struct binding_level *free_binding_level;
249 /* The outermost binding level, for names of file scope.
250 This is created when the compiler is started and exists
251 through the entire run. */
253 static struct binding_level *global_binding_level;
255 /* Binding level structures are initialized by copying this one. */
257 static struct binding_level clear_binding_level
258 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, 0,
261 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
263 static int keep_next_level_flag;
265 /* Nonzero means make a BLOCK for the next level pushed
266 if it has subblocks. */
268 static int keep_next_if_subblocks;
270 /* The chain of outer levels of label scopes.
271 This uses the same data structure used for binding levels,
272 but it works differently: each link in the chain records
273 saved values of named_labels and shadowed_labels for
274 a label binding level outside the current one. */
276 static struct binding_level *label_level_chain;
278 /* Functions called automatically at the beginning and end of execution. */
280 tree static_ctors, static_dtors;
282 /* Forward declarations. */
284 static struct binding_level * make_binding_level PARAMS ((void));
285 static void mark_binding_level PARAMS ((void *));
286 static void clear_limbo_values PARAMS ((tree));
287 static int duplicate_decls PARAMS ((tree, tree, int));
288 static int redeclaration_error_message PARAMS ((tree, tree));
289 static void storedecls PARAMS ((tree));
290 static void storetags PARAMS ((tree));
291 static tree lookup_tag PARAMS ((enum tree_code, tree,
292 struct binding_level *, int));
293 static tree lookup_tag_reverse PARAMS ((tree));
294 static tree grokdeclarator PARAMS ((tree, tree, enum decl_context,
296 static tree grokparms PARAMS ((tree, int));
297 static void layout_array_type PARAMS ((tree));
298 static tree c_make_fname_decl PARAMS ((tree, const char *, int));
300 /* C-specific option variables. */
302 /* Nonzero means allow type mismatches in conditional expressions;
303 just make their values `void'. */
305 int flag_cond_mismatch;
307 /* Nonzero means give `double' the same size as `float'. */
309 int flag_short_double;
311 /* Nonzero means give `wchar_t' the same size as `short'. */
313 int flag_short_wchar;
315 /* Nonzero means don't recognize the keyword `asm'. */
319 /* Nonzero means don't recognize any builtin functions. */
323 /* Nonzero means don't recognize the non-ANSI builtin functions.
326 int flag_no_nonansi_builtin;
328 /* Nonzero means do some things the same way PCC does. */
330 int flag_traditional;
332 /* Nonzero means enable C89 Amendment 1 features, other than digraphs. */
336 /* Nonzero means use the ISO C99 dialect of C. */
340 /* Nonzero means accept digraphs. */
342 int flag_digraphs = 1;
344 /* Nonzero means that we have builtin functions, and main is an int */
348 /* Nonzero means add default format_arg attributes for functions not
351 int flag_noniso_default_format_attributes = 1;
353 /* Nonzero means to allow single precision math even if we're generally
354 being traditional. */
355 int flag_allow_single_precision = 0;
357 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
359 int flag_signed_bitfields = 1;
360 int explicit_flag_signed_bitfields = 0;
362 /* Nonzero means warn about use of implicit int. */
364 int warn_implicit_int;
366 /* Nonzero means warn about usage of long long when `-pedantic'. */
368 int warn_long_long = 1;
370 /* Nonzero means message about use of implicit function declarations;
371 1 means warning; 2 means error. */
373 int mesg_implicit_function_declaration = -1;
375 /* Nonzero means give string constants the type `const char *'
376 to get extra warnings from them. These warnings will be too numerous
377 to be useful, except in thoroughly ANSIfied programs. */
379 int flag_const_strings;
381 /* Nonzero means warn about pointer casts that can drop a type qualifier
382 from the pointer target type. */
386 /* Nonzero means warn when casting a function call to a type that does
387 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
388 when there is no previous declaration of sqrt or malloc. */
390 int warn_bad_function_cast;
392 /* Warn about functions which might be candidates for attribute noreturn. */
394 int warn_missing_noreturn;
396 /* Warn about traditional constructs whose meanings changed in ANSI C. */
398 int warn_traditional;
400 /* Nonzero means warn about sizeof(function) or addition/subtraction
401 of function pointers. */
403 int warn_pointer_arith;
405 /* Nonzero means warn for non-prototype function decls
406 or non-prototyped defs without previous prototype. */
408 int warn_strict_prototypes;
410 /* Nonzero means warn for any global function def
411 without separate previous prototype decl. */
413 int warn_missing_prototypes;
415 /* Nonzero means warn for any global function def
416 without separate previous decl. */
418 int warn_missing_declarations;
420 /* Nonzero means warn about multiple (redundant) decls for the same single
421 variable or function. */
423 int warn_redundant_decls = 0;
425 /* Nonzero means warn about extern declarations of objects not at
426 file-scope level and about *all* declarations of functions (whether
427 extern or static) not at file-scope level. Note that we exclude
428 implicit function declarations. To get warnings about those, use
431 int warn_nested_externs = 0;
433 /* Warn about *printf or *scanf format/argument anomalies. */
437 /* Warn about a subscript that has type char. */
439 int warn_char_subscripts = 0;
441 /* Warn if a type conversion is done that might have confusing results. */
445 /* Warn if adding () is suggested. */
447 int warn_parentheses;
449 /* Warn if initializer is not completely bracketed. */
451 int warn_missing_braces;
453 /* Warn if main is suspicious. */
457 /* Warn about #pragma directives that are not recognised. */
459 int warn_unknown_pragmas = 0; /* Tri state variable. */
461 /* Warn about comparison of signed and unsigned values.
462 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
464 int warn_sign_compare = -1;
466 /* Warn about testing equality of floating point numbers. */
468 int warn_float_equal = 0;
470 /* Nonzero means warn about use of multicharacter literals. */
472 int warn_multichar = 1;
474 /* Wrapper since C and C++ expand_expr_stmt are different. */
476 expand_expr_stmt_fn lang_expand_expr_stmt = c_expand_expr_stmt;
478 /* The variant of the C language being processed. */
480 c_language_kind c_language = clk_c;
482 /* Nonzero means `$' can be in an identifier. */
484 #ifndef DOLLARS_IN_IDENTIFIERS
485 #define DOLLARS_IN_IDENTIFIERS 1
487 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
489 /* Decode the string P as a language-specific option for C.
490 Return the number of strings consumed. Should not complain
491 if it does not recognise the option. */
494 c_decode_option (argc, argv)
495 int argc ATTRIBUTE_UNUSED;
498 int strings_processed;
501 strings_processed = cpp_handle_option (&parse_in, argc, argv);
503 strings_processed = 0;
504 #endif /* ! USE_CPPLIB */
506 if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
508 flag_traditional = 1;
509 flag_writable_strings = 1;
512 else if (!strcmp (p, "-fallow-single-precision"))
513 flag_allow_single_precision = 1;
514 else if (!strcmp (p, "-fhosted") || !strcmp (p, "-fno-freestanding"))
519 else if (!strcmp (p, "-ffreestanding") || !strcmp (p, "-fno-hosted"))
523 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
527 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
529 flag_traditional = 0;
530 flag_writable_strings = 0;
533 else if (!strncmp (p, "-std=", 5))
535 /* Select the appropriate language standard. We currently
537 -std=iso9899:1990 same as -ansi
538 -std=iso9899:199409 ISO C as modified in amend. 1
539 -std=iso9899:1999 ISO C 99
540 -std=c89 same as -std=iso9899:1990
541 -std=c99 same as -std=iso9899:1999
542 -std=gnu89 default, iso9899:1990 + gnu extensions
543 -std=gnu99 iso9899:1999 + gnu extensions
545 const char *argstart = &p[5];
547 if (!strcmp (argstart, "iso9899:1990")
548 || !strcmp (argstart, "c89"))
554 flag_traditional = 0;
555 flag_writable_strings = 0;
557 flag_no_nonansi_builtin = 1;
558 flag_noniso_default_format_attributes = 0;
561 else if (!strcmp (argstart, "iso9899:199409"))
565 goto iso_1990_digraphs;
567 else if (!strcmp (argstart, "iso9899:199x")
568 || !strcmp (argstart, "iso9899:1999")
569 || !strcmp (argstart, "c9x")
570 || !strcmp (argstart, "c99"))
572 flag_traditional = 0;
573 flag_writable_strings = 0;
575 flag_no_nonansi_builtin = 1;
576 flag_noniso_default_format_attributes = 0;
581 else if (!strcmp (argstart, "gnu89"))
583 flag_traditional = 0;
584 flag_writable_strings = 0;
586 flag_no_nonansi_builtin = 0;
587 flag_noniso_default_format_attributes = 1;
592 else if (!strcmp (argstart, "gnu9x") || !strcmp (argstart, "gnu99"))
594 flag_traditional = 0;
595 flag_writable_strings = 0;
597 flag_no_nonansi_builtin = 0;
598 flag_noniso_default_format_attributes = 1;
604 error ("unknown C standard `%s'", argstart);
606 else if (!strcmp (p, "-fdollars-in-identifiers"))
607 dollars_in_ident = 1;
608 else if (!strcmp (p, "-fno-dollars-in-identifiers"))
609 dollars_in_ident = 0;
610 else if (!strcmp (p, "-fsigned-char"))
611 flag_signed_char = 1;
612 else if (!strcmp (p, "-funsigned-char"))
613 flag_signed_char = 0;
614 else if (!strcmp (p, "-fno-signed-char"))
615 flag_signed_char = 0;
616 else if (!strcmp (p, "-fno-unsigned-char"))
617 flag_signed_char = 1;
618 else if (!strcmp (p, "-fsigned-bitfields")
619 || !strcmp (p, "-fno-unsigned-bitfields"))
621 flag_signed_bitfields = 1;
622 explicit_flag_signed_bitfields = 1;
624 else if (!strcmp (p, "-funsigned-bitfields")
625 || !strcmp (p, "-fno-signed-bitfields"))
627 flag_signed_bitfields = 0;
628 explicit_flag_signed_bitfields = 1;
630 else if (!strcmp (p, "-fshort-enums"))
631 flag_short_enums = 1;
632 else if (!strcmp (p, "-fno-short-enums"))
633 flag_short_enums = 0;
634 else if (!strcmp (p, "-fshort-wchar"))
635 flag_short_wchar = 1;
636 else if (!strcmp (p, "-fno-short-wchar"))
637 flag_short_wchar = 0;
638 else if (!strcmp (p, "-fcond-mismatch"))
639 flag_cond_mismatch = 1;
640 else if (!strcmp (p, "-fno-cond-mismatch"))
641 flag_cond_mismatch = 0;
642 else if (!strcmp (p, "-fshort-double"))
643 flag_short_double = 1;
644 else if (!strcmp (p, "-fno-short-double"))
645 flag_short_double = 0;
646 else if (!strcmp (p, "-fasm"))
648 else if (!strcmp (p, "-fno-asm"))
650 else if (!strcmp (p, "-fbuiltin"))
652 else if (!strcmp (p, "-fno-builtin"))
654 else if (!strcmp (p, "-ansi"))
656 else if (!strcmp (p, "-Werror-implicit-function-declaration"))
657 mesg_implicit_function_declaration = 2;
658 else if (!strcmp (p, "-Wimplicit-function-declaration"))
659 mesg_implicit_function_declaration = 1;
660 else if (!strcmp (p, "-Wno-implicit-function-declaration"))
661 mesg_implicit_function_declaration = 0;
662 else if (!strcmp (p, "-Wimplicit-int"))
663 warn_implicit_int = 1;
664 else if (!strcmp (p, "-Wno-implicit-int"))
665 warn_implicit_int = 0;
666 else if (!strcmp (p, "-Wimplicit"))
668 warn_implicit_int = 1;
669 if (mesg_implicit_function_declaration != 2)
670 mesg_implicit_function_declaration = 1;
672 else if (!strcmp (p, "-Wno-implicit"))
673 warn_implicit_int = 0, mesg_implicit_function_declaration = 0;
674 else if (!strcmp (p, "-Wlong-long"))
676 else if (!strcmp (p, "-Wno-long-long"))
678 else if (!strcmp (p, "-Wwrite-strings"))
679 flag_const_strings = 1;
680 else if (!strcmp (p, "-Wno-write-strings"))
681 flag_const_strings = 0;
682 else if (!strcmp (p, "-Wcast-qual"))
684 else if (!strcmp (p, "-Wno-cast-qual"))
686 else if (!strcmp (p, "-Wbad-function-cast"))
687 warn_bad_function_cast = 1;
688 else if (!strcmp (p, "-Wno-bad-function-cast"))
689 warn_bad_function_cast = 0;
690 else if (!strcmp (p, "-Wmissing-noreturn"))
691 warn_missing_noreturn = 1;
692 else if (!strcmp (p, "-Wno-missing-noreturn"))
693 warn_missing_noreturn = 0;
694 else if (!strcmp (p, "-Wpointer-arith"))
695 warn_pointer_arith = 1;
696 else if (!strcmp (p, "-Wno-pointer-arith"))
697 warn_pointer_arith = 0;
698 else if (!strcmp (p, "-Wstrict-prototypes"))
699 warn_strict_prototypes = 1;
700 else if (!strcmp (p, "-Wno-strict-prototypes"))
701 warn_strict_prototypes = 0;
702 else if (!strcmp (p, "-Wmissing-prototypes"))
703 warn_missing_prototypes = 1;
704 else if (!strcmp (p, "-Wno-missing-prototypes"))
705 warn_missing_prototypes = 0;
706 else if (!strcmp (p, "-Wmissing-declarations"))
707 warn_missing_declarations = 1;
708 else if (!strcmp (p, "-Wno-missing-declarations"))
709 warn_missing_declarations = 0;
710 else if (!strcmp (p, "-Wredundant-decls"))
711 warn_redundant_decls = 1;
712 else if (!strcmp (p, "-Wno-redundant-decls"))
713 warn_redundant_decls = 0;
714 else if (!strcmp (p, "-Wnested-externs"))
715 warn_nested_externs = 1;
716 else if (!strcmp (p, "-Wno-nested-externs"))
717 warn_nested_externs = 0;
718 else if (!strcmp (p, "-Wtraditional"))
719 warn_traditional = 1;
720 else if (!strcmp (p, "-Wno-traditional"))
721 warn_traditional = 0;
722 else if (!strncmp (p, "-Wformat=", 9))
723 warn_format = atol (p + 9);
724 else if (!strcmp (p, "-Wformat"))
726 else if (!strcmp (p, "-Wno-format"))
728 else if (!strcmp (p, "-Wchar-subscripts"))
729 warn_char_subscripts = 1;
730 else if (!strcmp (p, "-Wno-char-subscripts"))
731 warn_char_subscripts = 0;
732 else if (!strcmp (p, "-Wconversion"))
734 else if (!strcmp (p, "-Wno-conversion"))
736 else if (!strcmp (p, "-Wparentheses"))
737 warn_parentheses = 1;
738 else if (!strcmp (p, "-Wno-parentheses"))
739 warn_parentheses = 0;
740 else if (!strcmp (p, "-Wreturn-type"))
741 warn_return_type = 1;
742 else if (!strcmp (p, "-Wno-return-type"))
743 warn_return_type = 0;
744 else if (!strcmp (p, "-Wcomment"))
745 ; /* cpp handles this one. */
746 else if (!strcmp (p, "-Wno-comment"))
747 ; /* cpp handles this one. */
748 else if (!strcmp (p, "-Wcomments"))
749 ; /* cpp handles this one. */
750 else if (!strcmp (p, "-Wno-comments"))
751 ; /* cpp handles this one. */
752 else if (!strcmp (p, "-Wtrigraphs"))
753 ; /* cpp handles this one. */
754 else if (!strcmp (p, "-Wno-trigraphs"))
755 ; /* cpp handles this one. */
756 else if (!strcmp (p, "-Wundef"))
757 ; /* cpp handles this one. */
758 else if (!strcmp (p, "-Wno-undef"))
759 ; /* cpp handles this one. */
760 else if (!strcmp (p, "-Wimport"))
761 ; /* cpp handles this one. */
762 else if (!strcmp (p, "-Wno-import"))
763 ; /* cpp handles this one. */
764 else if (!strcmp (p, "-Wmissing-braces"))
765 warn_missing_braces = 1;
766 else if (!strcmp (p, "-Wno-missing-braces"))
767 warn_missing_braces = 0;
768 else if (!strcmp (p, "-Wmain"))
770 else if (!strcmp (p, "-Wno-main"))
772 else if (!strcmp (p, "-Wsign-compare"))
773 warn_sign_compare = 1;
774 else if (!strcmp (p, "-Wno-sign-compare"))
775 warn_sign_compare = 0;
776 else if (!strcmp (p, "-Wfloat-equal"))
777 warn_float_equal = 1;
778 else if (!strcmp (p, "-Wno-float-equal"))
779 warn_float_equal = 0;
780 else if (!strcmp (p, "-Wmultichar"))
782 else if (!strcmp (p, "-Wno-multichar"))
784 else if (!strcmp (p, "-Wunknown-pragmas"))
785 /* Set to greater than 1, so that even unknown pragmas in system
786 headers will be warned about. */
787 warn_unknown_pragmas = 2;
788 else if (!strcmp (p, "-Wno-unknown-pragmas"))
789 warn_unknown_pragmas = 0;
790 else if (!strcmp (p, "-Wall"))
792 /* We save the value of warn_uninitialized, since if they put
793 -Wuninitialized on the command line, we need to generate a
794 warning about not using it without also specifying -O. */
795 if (warn_uninitialized != 1)
796 warn_uninitialized = 2;
797 warn_implicit_int = 1;
798 mesg_implicit_function_declaration = 1;
799 warn_return_type = 1;
803 warn_char_subscripts = 1;
804 warn_parentheses = 1;
805 warn_missing_braces = 1;
806 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
807 it off only if it's not explicit. */
809 /* Only warn about unknown pragmas that are not in system headers. */
810 warn_unknown_pragmas = 1;
813 return strings_processed;
818 /* Hooks for print_node. */
821 print_lang_decl (file, node, indent)
822 FILE *file ATTRIBUTE_UNUSED;
823 tree node ATTRIBUTE_UNUSED;
824 int indent ATTRIBUTE_UNUSED;
829 print_lang_type (file, node, indent)
830 FILE *file ATTRIBUTE_UNUSED;
831 tree node ATTRIBUTE_UNUSED;
832 int indent ATTRIBUTE_UNUSED;
837 print_lang_identifier (file, node, indent)
842 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
843 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
844 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
845 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
846 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
847 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
850 /* Hook called at end of compilation to assume 1 elt
851 for a top-level tentative array defn that wasn't complete before. */
854 finish_incomplete_decl (decl)
857 if (TREE_CODE (decl) == VAR_DECL)
859 tree type = TREE_TYPE (decl);
860 if (type != error_mark_node
861 && TREE_CODE (type) == ARRAY_TYPE
862 && ! DECL_EXTERNAL (decl)
863 && TYPE_DOMAIN (type) == 0)
865 warning_with_decl (decl, "array `%s' assumed to have one element");
867 complete_array_type (type, NULL_TREE, 1);
869 layout_decl (decl, 0);
874 /* Create a new `struct binding_level'. */
876 static struct binding_level *
877 make_binding_level ()
880 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
883 /* Nonzero if we are currently in the global binding level. */
888 return current_binding_level == global_binding_level;
894 keep_next_level_flag = 1;
897 /* Nonzero if the current level needs to have a BLOCK made. */
902 return ((current_binding_level->keep_if_subblocks
903 && current_binding_level->blocks != 0)
904 || current_binding_level->keep
905 || current_binding_level->names != 0
906 || (current_binding_level->tags != 0
907 && !current_binding_level->tag_transparent));
910 /* Identify this binding level as a level of parameters.
911 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
912 But it turns out there is no way to pass the right value for
913 DEFINITION_FLAG, so we ignore it. */
916 declare_parm_level (definition_flag)
917 int definition_flag ATTRIBUTE_UNUSED;
919 current_binding_level->parm_flag = 1;
922 /* Nonzero if currently making parm declarations. */
927 return current_binding_level->parm_flag;
930 /* Enter a new binding level.
931 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
932 not for that of tags. */
935 pushlevel (tag_transparent)
938 register struct binding_level *newlevel = NULL_BINDING_LEVEL;
940 /* If this is the top level of a function,
941 just make sure that NAMED_LABELS is 0. */
943 if (current_binding_level == global_binding_level)
948 /* Reuse or create a struct for this binding level. */
950 if (free_binding_level)
952 newlevel = free_binding_level;
953 free_binding_level = free_binding_level->level_chain;
957 newlevel = make_binding_level ();
960 /* Add this level to the front of the chain (stack) of levels that
963 *newlevel = clear_binding_level;
964 newlevel->tag_transparent
966 || (current_binding_level
967 ? current_binding_level->subblocks_tag_transparent
969 newlevel->level_chain = current_binding_level;
970 current_binding_level = newlevel;
971 newlevel->keep = keep_next_level_flag;
972 keep_next_level_flag = 0;
973 newlevel->keep_if_subblocks = keep_next_if_subblocks;
974 keep_next_if_subblocks = 0;
977 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
980 clear_limbo_values (block)
985 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
986 if (DECL_NAME (tem) != 0)
987 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
989 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
990 clear_limbo_values (tem);
993 /* Exit a binding level.
994 Pop the level off, and restore the state of the identifier-decl mappings
995 that were in effect when this level was entered.
997 If KEEP is nonzero, this level had explicit declarations, so
998 and create a "block" (a BLOCK node) for the level
999 to record its declarations and subblocks for symbol table output.
1001 If FUNCTIONBODY is nonzero, this level is the body of a function,
1002 so create a block as if KEEP were set and also clear out all
1005 If REVERSE is nonzero, reverse the order of decls before putting
1006 them into the BLOCK. */
1009 poplevel (keep, reverse, functionbody)
1015 /* The chain of decls was accumulated in reverse order.
1016 Put it into forward order, just for cleanliness. */
1018 tree tags = current_binding_level->tags;
1019 tree subblocks = current_binding_level->blocks;
1022 int block_previously_created;
1024 keep |= current_binding_level->keep;
1026 /* This warning is turned off because it causes warnings for
1027 declarations like `extern struct foo *x'. */
1029 /* Warn about incomplete structure types in this level. */
1030 for (link = tags; link; link = TREE_CHAIN (link))
1031 if (!COMPLETE_TYPE_P (TREE_VALUE (link)))
1033 tree type = TREE_VALUE (link);
1034 tree type_name = TYPE_NAME (type);
1035 char *id = IDENTIFIER_POINTER (TREE_CODE (type_name) == IDENTIFIER_NODE
1037 : DECL_NAME (type_name));
1038 switch (TREE_CODE (type))
1041 error ("`struct %s' incomplete in scope ending here", id);
1044 error ("`union %s' incomplete in scope ending here", id);
1047 error ("`enum %s' incomplete in scope ending here", id);
1053 /* Get the decls in the order they were written.
1054 Usually current_binding_level->names is in reverse order.
1055 But parameter decls were previously put in forward order. */
1058 current_binding_level->names
1059 = decls = nreverse (current_binding_level->names);
1061 decls = current_binding_level->names;
1063 /* Output any nested inline functions within this block
1064 if they weren't already output. */
1066 for (decl = decls; decl; decl = TREE_CHAIN (decl))
1067 if (TREE_CODE (decl) == FUNCTION_DECL
1068 && ! TREE_ASM_WRITTEN (decl)
1069 && DECL_INITIAL (decl) != 0
1070 && TREE_ADDRESSABLE (decl))
1072 /* If this decl was copied from a file-scope decl
1073 on account of a block-scope extern decl,
1074 propagate TREE_ADDRESSABLE to the file-scope decl.
1076 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1077 true, since then the decl goes through save_for_inline_copying. */
1078 if (DECL_ABSTRACT_ORIGIN (decl) != 0
1079 && DECL_ABSTRACT_ORIGIN (decl) != decl)
1080 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
1081 else if (DECL_SAVED_INSNS (decl) != 0)
1083 push_function_context ();
1084 output_inline_function (decl);
1085 pop_function_context ();
1089 /* If there were any declarations or structure tags in that level,
1090 or if this level is a function body,
1091 create a BLOCK to record them for the life of this function. */
1094 block_previously_created = (current_binding_level->this_block != 0);
1095 if (block_previously_created)
1096 block = current_binding_level->this_block;
1097 else if (keep || functionbody
1098 || (current_binding_level->keep_if_subblocks && subblocks != 0))
1099 block = make_node (BLOCK);
1102 BLOCK_VARS (block) = decls;
1103 BLOCK_SUBBLOCKS (block) = subblocks;
1106 /* In each subblock, record that this is its superior. */
1108 for (link = subblocks; link; link = TREE_CHAIN (link))
1109 BLOCK_SUPERCONTEXT (link) = block;
1111 /* Clear out the meanings of the local variables of this level. */
1113 for (link = decls; link; link = TREE_CHAIN (link))
1115 if (DECL_NAME (link) != 0)
1117 /* If the ident. was used or addressed via a local extern decl,
1118 don't forget that fact. */
1119 if (DECL_EXTERNAL (link))
1121 if (TREE_USED (link))
1122 TREE_USED (DECL_NAME (link)) = 1;
1123 if (TREE_ADDRESSABLE (link))
1124 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1126 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1130 /* Restore all name-meanings of the outer levels
1131 that were shadowed by this level. */
1133 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1134 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1136 /* If the level being exited is the top level of a function,
1137 check over all the labels, and clear out the current
1138 (function local) meanings of their names. */
1142 clear_limbo_values (block);
1144 /* If this is the top level block of a function,
1145 the vars are the function's parameters.
1146 Don't leave them in the BLOCK because they are
1147 found in the FUNCTION_DECL instead. */
1149 BLOCK_VARS (block) = 0;
1151 /* Clear out the definitions of all label names,
1152 since their scopes end here,
1153 and add them to BLOCK_VARS. */
1155 for (link = named_labels; link; link = TREE_CHAIN (link))
1157 register tree label = TREE_VALUE (link);
1159 if (DECL_INITIAL (label) == 0)
1161 error_with_decl (label, "label `%s' used but not defined");
1162 /* Avoid crashing later. */
1163 define_label (input_filename, lineno,
1166 else if (warn_unused_label && !TREE_USED (label))
1167 warning_with_decl (label, "label `%s' defined but not used");
1168 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1170 /* Put the labels into the "variables" of the
1171 top-level block, so debugger can see them. */
1172 TREE_CHAIN (label) = BLOCK_VARS (block);
1173 BLOCK_VARS (block) = label;
1177 /* Pop the current level, and free the structure for reuse. */
1180 register struct binding_level *level = current_binding_level;
1181 current_binding_level = current_binding_level->level_chain;
1183 level->level_chain = free_binding_level;
1184 free_binding_level = level;
1187 /* Dispose of the block that we just made inside some higher level. */
1189 DECL_INITIAL (current_function_decl) = block;
1192 if (!block_previously_created)
1193 current_binding_level->blocks
1194 = chainon (current_binding_level->blocks, block);
1196 /* If we did not make a block for the level just exited,
1197 any blocks made for inner levels
1198 (since they cannot be recorded as subblocks in that level)
1199 must be carried forward so they will later become subblocks
1200 of something else. */
1202 current_binding_level->blocks
1203 = chainon (current_binding_level->blocks, subblocks);
1205 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1206 binding contour so that they point to the appropriate construct, i.e.
1207 either to the current FUNCTION_DECL node, or else to the BLOCK node
1208 we just constructed.
1210 Note that for tagged types whose scope is just the formal parameter
1211 list for some function type specification, we can't properly set
1212 their TYPE_CONTEXTs here, because we don't have a pointer to the
1213 appropriate FUNCTION_TYPE node readily available to us. For those
1214 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1215 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1216 node which will represent the "scope" for these "parameter list local"
1220 for (link = tags; link; link = TREE_CHAIN (link))
1221 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1223 for (link = tags; link; link = TREE_CHAIN (link))
1224 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1227 TREE_USED (block) = 1;
1231 /* Delete the node BLOCK from the current binding level.
1232 This is used for the block inside a stmt expr ({...})
1233 so that the block can be reinserted where appropriate. */
1236 delete_block (block)
1240 if (current_binding_level->blocks == block)
1241 current_binding_level->blocks = TREE_CHAIN (block);
1242 for (t = current_binding_level->blocks; t;)
1244 if (TREE_CHAIN (t) == block)
1245 TREE_CHAIN (t) = TREE_CHAIN (block);
1249 TREE_CHAIN (block) = NULL;
1250 /* Clear TREE_USED which is always set by poplevel.
1251 The flag is set again if insert_block is called. */
1252 TREE_USED (block) = 0;
1255 /* Insert BLOCK at the end of the list of subblocks of the
1256 current binding level. This is used when a BIND_EXPR is expanded,
1257 to handle the BLOCK node inside the BIND_EXPR. */
1260 insert_block (block)
1263 TREE_USED (block) = 1;
1264 current_binding_level->blocks
1265 = chainon (current_binding_level->blocks, block);
1268 /* Set the BLOCK node for the innermost scope
1269 (the one we are currently in). */
1273 register tree block;
1275 current_binding_level->this_block = block;
1281 register struct binding_level *newlevel;
1283 /* Reuse or create a struct for this binding level. */
1285 if (free_binding_level)
1287 newlevel = free_binding_level;
1288 free_binding_level = free_binding_level->level_chain;
1292 newlevel = make_binding_level ();
1295 /* Add this level to the front of the chain (stack) of label levels. */
1297 newlevel->level_chain = label_level_chain;
1298 label_level_chain = newlevel;
1300 newlevel->names = named_labels;
1301 newlevel->shadowed = shadowed_labels;
1303 shadowed_labels = 0;
1309 register struct binding_level *level = label_level_chain;
1312 /* Clear out the definitions of the declared labels in this level.
1313 Leave in the list any ordinary, non-declared labels. */
1314 for (link = named_labels, prev = 0; link;)
1316 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1318 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1320 error_with_decl (TREE_VALUE (link),
1321 "label `%s' used but not defined");
1322 /* Avoid crashing later. */
1323 define_label (input_filename, lineno,
1324 DECL_NAME (TREE_VALUE (link)));
1326 else if (warn_unused_label && !TREE_USED (TREE_VALUE (link)))
1327 warning_with_decl (TREE_VALUE (link),
1328 "label `%s' defined but not used");
1329 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1331 /* Delete this element from the list. */
1332 link = TREE_CHAIN (link);
1334 TREE_CHAIN (prev) = link;
1336 named_labels = link;
1341 link = TREE_CHAIN (link);
1345 /* Bring back all the labels that were shadowed. */
1346 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1347 if (DECL_NAME (TREE_VALUE (link)) != 0)
1348 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1349 = TREE_VALUE (link);
1351 named_labels = chainon (named_labels, level->names);
1352 shadowed_labels = level->shadowed;
1354 /* Pop the current level, and free the structure for reuse. */
1355 label_level_chain = label_level_chain->level_chain;
1356 level->level_chain = free_binding_level;
1357 free_binding_level = level;
1360 /* Push a definition or a declaration of struct, union or enum tag "name".
1361 "type" should be the type node.
1362 We assume that the tag "name" is not already defined.
1364 Note that the definition may really be just a forward reference.
1365 In that case, the TYPE_SIZE will be zero. */
1368 pushtag (name, type)
1371 register struct binding_level *b;
1373 /* Find the proper binding level for this type tag. */
1375 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1380 /* Record the identifier as the type's name if it has none. */
1382 if (TYPE_NAME (type) == 0)
1383 TYPE_NAME (type) = name;
1386 b->tags = tree_cons (name, type, b->tags);
1388 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1389 tagged type we just added to the current binding level. This fake
1390 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1391 to output a representation of a tagged type, and it also gives
1392 us a convenient place to record the "scope start" address for the
1395 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1397 /* An approximation for now, so we can tell this is a function-scope tag.
1398 This will be updated in poplevel. */
1399 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1402 /* Handle when a new declaration NEWDECL
1403 has the same name as an old one OLDDECL
1404 in the same binding contour.
1405 Prints an error message if appropriate.
1407 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1408 Otherwise, return 0.
1410 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1411 and OLDDECL is in an outer binding level and should thus not be changed. */
1414 duplicate_decls (newdecl, olddecl, different_binding_level)
1415 register tree newdecl, olddecl;
1416 int different_binding_level;
1418 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1419 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1420 && DECL_INITIAL (newdecl) != 0);
1421 tree oldtype = TREE_TYPE (olddecl);
1422 tree newtype = TREE_TYPE (newdecl);
1425 if (DECL_P (olddecl))
1426 DECL_MACHINE_ATTRIBUTES (newdecl)
1427 = merge_machine_decl_attributes (olddecl, newdecl);
1429 if (TREE_CODE (newtype) == ERROR_MARK
1430 || TREE_CODE (oldtype) == ERROR_MARK)
1433 /* New decl is completely inconsistent with the old one =>
1434 tell caller to replace the old one.
1435 This is always an error except in the case of shadowing a builtin. */
1436 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1438 if (TREE_CODE (olddecl) == FUNCTION_DECL
1439 && (DECL_BUILT_IN (olddecl)
1440 || DECL_BUILT_IN_NONANSI (olddecl)))
1442 /* If you declare a built-in or predefined function name as static,
1443 the old definition is overridden,
1444 but optionally warn this was a bad choice of name. */
1445 if (!TREE_PUBLIC (newdecl))
1449 else if (DECL_BUILT_IN (olddecl))
1450 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1452 warning_with_decl (newdecl, "shadowing library function `%s'");
1454 /* Likewise, if the built-in is not ansi, then programs can
1455 override it even globally without an error. */
1456 else if (! DECL_BUILT_IN (olddecl))
1457 warning_with_decl (newdecl,
1458 "library function `%s' declared as non-function");
1460 else if (DECL_BUILT_IN_NONANSI (olddecl))
1461 warning_with_decl (newdecl,
1462 "built-in function `%s' declared as non-function");
1464 warning_with_decl (newdecl,
1465 "built-in function `%s' declared as non-function");
1469 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1470 error_with_decl (olddecl, "previous declaration of `%s'");
1476 /* For real parm decl following a forward decl,
1477 return 1 so old decl will be reused. */
1478 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1479 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1482 /* The new declaration is the same kind of object as the old one.
1483 The declarations may partially match. Print warnings if they don't
1484 match enough. Ultimately, copy most of the information from the new
1485 decl to the old one, and keep using the old one. */
1487 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1488 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1489 && DECL_INITIAL (olddecl) == 0)
1490 /* If -traditional, avoid error for redeclaring fcn
1491 after implicit decl. */
1493 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1494 && DECL_BUILT_IN (olddecl))
1496 /* A function declaration for a built-in function. */
1497 if (!TREE_PUBLIC (newdecl))
1499 /* If you declare a built-in function name as static, the
1500 built-in definition is overridden,
1501 but optionally warn this was a bad choice of name. */
1503 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1504 /* Discard the old built-in function. */
1507 else if (!types_match)
1509 /* Accept the return type of the new declaration if same modes. */
1510 tree oldreturntype = TREE_TYPE (oldtype);
1511 tree newreturntype = TREE_TYPE (newtype);
1513 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1515 /* Function types may be shared, so we can't just modify
1516 the return type of olddecl's function type. */
1518 = build_function_type (newreturntype,
1519 TYPE_ARG_TYPES (oldtype));
1521 types_match = comptypes (newtype, trytype);
1525 /* Accept harmless mismatch in first argument type also.
1527 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1528 && TYPE_ARG_TYPES (oldtype) != 0
1529 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1530 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1531 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1532 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1534 /* Function types may be shared, so we can't just modify
1535 the return type of olddecl's function type. */
1537 = build_function_type (TREE_TYPE (oldtype),
1538 tree_cons (NULL_TREE,
1539 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1540 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1542 types_match = comptypes (newtype, trytype);
1546 if (! different_binding_level)
1547 TREE_TYPE (olddecl) = oldtype;
1551 /* If types don't match for a built-in, throw away the built-in. */
1552 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1556 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1557 && DECL_SOURCE_LINE (olddecl) == 0)
1559 /* A function declaration for a predeclared function
1560 that isn't actually built in. */
1561 if (!TREE_PUBLIC (newdecl))
1563 /* If you declare it as static, the
1564 default definition is overridden. */
1567 else if (!types_match)
1569 /* If the types don't match, preserve volatility indication.
1570 Later on, we will discard everything else about the
1571 default declaration. */
1572 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1575 /* Permit char *foo () to match void *foo (...) if not pedantic,
1576 if one of them came from a system header file. */
1577 else if (!types_match
1578 && TREE_CODE (olddecl) == FUNCTION_DECL
1579 && TREE_CODE (newdecl) == FUNCTION_DECL
1580 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1581 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1582 && (DECL_IN_SYSTEM_HEADER (olddecl)
1583 || DECL_IN_SYSTEM_HEADER (newdecl))
1584 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1585 && TYPE_ARG_TYPES (oldtype) == 0
1586 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1587 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1589 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1590 && TYPE_ARG_TYPES (newtype) == 0
1591 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1592 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1595 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1596 /* Make sure we keep void * as ret type, not char *. */
1597 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1598 TREE_TYPE (newdecl) = newtype = oldtype;
1600 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1601 we will come back here again. */
1602 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1604 else if (!types_match
1605 /* Permit char *foo (int, ...); followed by char *foo ();
1607 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1609 /* Return types must still match. */
1610 && comptypes (TREE_TYPE (oldtype),
1611 TREE_TYPE (newtype))
1612 && TYPE_ARG_TYPES (newtype) == 0))
1614 error_with_decl (newdecl, "conflicting types for `%s'");
1615 /* Check for function type mismatch
1616 involving an empty arglist vs a nonempty one. */
1617 if (TREE_CODE (olddecl) == FUNCTION_DECL
1618 && comptypes (TREE_TYPE (oldtype),
1619 TREE_TYPE (newtype))
1620 && ((TYPE_ARG_TYPES (oldtype) == 0
1621 && DECL_INITIAL (olddecl) == 0)
1623 (TYPE_ARG_TYPES (newtype) == 0
1624 && DECL_INITIAL (newdecl) == 0)))
1626 /* Classify the problem further. */
1627 register tree t = TYPE_ARG_TYPES (oldtype);
1629 t = TYPE_ARG_TYPES (newtype);
1630 for (; t; t = TREE_CHAIN (t))
1632 register tree type = TREE_VALUE (t);
1634 if (TREE_CHAIN (t) == 0
1635 && TYPE_MAIN_VARIANT (type) != void_type_node)
1637 error ("A parameter list with an ellipsis can't match an empty parameter name list declaration.");
1641 if (simple_type_promotes_to (type) != NULL_TREE)
1643 error ("An argument type that has a default promotion can't match an empty parameter name list declaration.");
1648 error_with_decl (olddecl, "previous declaration of `%s'");
1652 errmsg = redeclaration_error_message (newdecl, olddecl);
1658 error_with_decl (newdecl, "redefinition of `%s'");
1661 error_with_decl (newdecl, "redeclaration of `%s'");
1664 error_with_decl (newdecl, "conflicting declarations of `%s'");
1670 error_with_decl (olddecl,
1671 ((DECL_INITIAL (olddecl)
1672 && current_binding_level == global_binding_level)
1673 ? "`%s' previously defined here"
1674 : "`%s' previously declared here"));
1676 else if (TREE_CODE (newdecl) == TYPE_DECL
1677 && (DECL_IN_SYSTEM_HEADER (olddecl)
1678 || DECL_IN_SYSTEM_HEADER (newdecl)))
1680 warning_with_decl (newdecl, "redefinition of `%s'");
1683 ((DECL_INITIAL (olddecl)
1684 && current_binding_level == global_binding_level)
1685 ? "`%s' previously defined here"
1686 : "`%s' previously declared here"));
1688 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1689 && DECL_INITIAL (olddecl) != 0
1690 && TYPE_ARG_TYPES (oldtype) == 0
1691 && TYPE_ARG_TYPES (newtype) != 0
1692 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1694 register tree type, parm;
1696 /* Prototype decl follows defn w/o prototype. */
1698 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1699 type = TYPE_ARG_TYPES (newtype),
1702 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1704 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1705 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1707 warning_with_decl (newdecl, "prototype for `%s' follows");
1708 warning_with_decl (olddecl, "non-prototype definition here");
1711 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1712 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1714 error_with_decl (newdecl,
1715 "prototype for `%s' follows and number of arguments doesn't match");
1716 error_with_decl (olddecl, "non-prototype definition here");
1720 /* Type for passing arg must be consistent
1721 with that declared for the arg. */
1722 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1723 /* If -traditional, allow `unsigned int' instead of `int'
1724 in the prototype. */
1725 && (! (flag_traditional
1726 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1727 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1729 error_with_decl (newdecl,
1730 "prototype for `%s' follows and argument %d doesn't match",
1732 error_with_decl (olddecl, "non-prototype definition here");
1738 /* Warn about mismatches in various flags. */
1741 /* Warn if function is now inline
1742 but was previously declared not inline and has been called. */
1743 if (TREE_CODE (olddecl) == FUNCTION_DECL
1744 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1745 && TREE_USED (olddecl))
1746 warning_with_decl (newdecl,
1747 "`%s' declared inline after being called");
1748 if (TREE_CODE (olddecl) == FUNCTION_DECL
1749 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1750 && DECL_INITIAL (olddecl) != 0)
1751 warning_with_decl (newdecl,
1752 "`%s' declared inline after its definition");
1754 /* If pedantic, warn when static declaration follows a non-static
1755 declaration. Otherwise, do so only for functions. */
1756 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1757 && TREE_PUBLIC (olddecl)
1758 && !TREE_PUBLIC (newdecl))
1759 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1761 /* If warn_traditional, warn when a non-static function
1762 declaration follows a static one. */
1763 if (warn_traditional && !in_system_header
1764 && TREE_CODE (olddecl) == FUNCTION_DECL
1765 && !TREE_PUBLIC (olddecl)
1766 && TREE_PUBLIC (newdecl))
1767 warning_with_decl (newdecl, "non-static declaration for `%s' follows static");
1769 /* Warn when const declaration follows a non-const
1770 declaration, but not for functions. */
1771 if (TREE_CODE (olddecl) != FUNCTION_DECL
1772 && !TREE_READONLY (olddecl)
1773 && TREE_READONLY (newdecl))
1774 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1775 /* These bits are logically part of the type, for variables.
1776 But not for functions
1777 (where qualifiers are not valid ANSI anyway). */
1778 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1779 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1780 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1781 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1785 /* Optionally warn about more than one declaration for the same name. */
1786 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1787 /* Don't warn about a function declaration
1788 followed by a definition. */
1789 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1790 && DECL_INITIAL (olddecl) == 0)
1791 /* Don't warn about extern decl followed by (tentative) definition. */
1792 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1794 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1795 warning_with_decl (olddecl, "previous declaration of `%s'");
1798 /* Copy all the DECL_... slots specified in the new decl
1799 except for any that we copy here from the old type.
1801 Past this point, we don't change OLDTYPE and NEWTYPE
1802 even if we change the types of NEWDECL and OLDDECL. */
1806 /* When copying info to olddecl, we store into write_olddecl
1807 instead. This allows us to avoid modifying olddecl when
1808 different_binding_level is true. */
1809 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1811 /* Merge the data types specified in the two decls. */
1812 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1814 if (different_binding_level)
1816 = build_type_attribute_variant
1818 merge_attributes (TYPE_ATTRIBUTES (newtype),
1819 TYPE_ATTRIBUTES (oldtype)));
1822 = TREE_TYPE (olddecl)
1823 = common_type (newtype, oldtype);
1826 /* Lay the type out, unless already done. */
1827 if (oldtype != TREE_TYPE (newdecl))
1829 if (TREE_TYPE (newdecl) != error_mark_node)
1830 layout_type (TREE_TYPE (newdecl));
1831 if (TREE_CODE (newdecl) != FUNCTION_DECL
1832 && TREE_CODE (newdecl) != TYPE_DECL
1833 && TREE_CODE (newdecl) != CONST_DECL)
1834 layout_decl (newdecl, 0);
1838 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1839 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1840 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1841 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1842 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1843 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1845 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1846 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1850 /* Keep the old rtl since we can safely use it. */
1851 DECL_RTL (newdecl) = DECL_RTL (olddecl);
1853 /* Merge the type qualifiers. */
1854 if (TREE_CODE (olddecl) == FUNCTION_DECL
1855 && DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1856 && ! TREE_THIS_VOLATILE (newdecl))
1857 TREE_THIS_VOLATILE (write_olddecl) = 0;
1859 if (TREE_READONLY (newdecl))
1860 TREE_READONLY (write_olddecl) = 1;
1862 if (TREE_THIS_VOLATILE (newdecl))
1864 TREE_THIS_VOLATILE (write_olddecl) = 1;
1865 if (TREE_CODE (newdecl) == VAR_DECL
1866 /* If an automatic variable is re-declared in the same
1867 function scope, but the old declaration was not
1868 volatile, make_var_volatile() would crash because the
1869 variable would have been assigned to a pseudo, not a
1870 MEM. Since this duplicate declaration is invalid
1871 anyway, we just skip the call. */
1873 make_var_volatile (newdecl);
1876 /* Keep source location of definition rather than declaration. */
1877 /* When called with different_binding_level set, keep the old
1878 information so that meaningful diagnostics can be given. */
1879 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1880 && ! different_binding_level)
1882 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1883 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1886 /* Merge the unused-warning information. */
1887 if (DECL_IN_SYSTEM_HEADER (olddecl))
1888 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1889 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1890 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1892 /* Merge the initialization information. */
1893 /* When called with different_binding_level set, don't copy over
1894 DECL_INITIAL, so that we don't accidentally change function
1895 declarations into function definitions. */
1896 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1897 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1899 /* Merge the section attribute.
1900 We want to issue an error if the sections conflict but that must be
1901 done later in decl_attributes since we are called before attributes
1903 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1904 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1906 /* Copy the assembler name.
1907 Currently, it can only be defined in the prototype. */
1908 DECL_ASSEMBLER_NAME (newdecl) = DECL_ASSEMBLER_NAME (olddecl);
1910 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1912 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1913 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1915 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1916 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1917 DECL_NO_CHECK_MEMORY_USAGE (newdecl)
1918 |= DECL_NO_CHECK_MEMORY_USAGE (olddecl);
1919 DECL_NO_LIMIT_STACK (newdecl)
1920 |= DECL_NO_LIMIT_STACK (olddecl);
1923 /* If cannot merge, then use the new type and qualifiers,
1924 and don't preserve the old rtl. */
1925 else if (! different_binding_level)
1927 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1928 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1929 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1930 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1933 /* Merge the storage class information. */
1934 DECL_WEAK (newdecl) |= DECL_WEAK (olddecl);
1935 /* For functions, static overrides non-static. */
1936 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1938 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1939 /* This is since we don't automatically
1940 copy the attributes of NEWDECL into OLDDECL. */
1941 /* No need to worry about different_binding_level here because
1942 then TREE_PUBLIC (newdecl) was true. */
1943 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1944 /* If this clears `static', clear it in the identifier too. */
1945 if (! TREE_PUBLIC (olddecl))
1946 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1948 if (DECL_EXTERNAL (newdecl))
1950 if (! different_binding_level)
1952 /* Don't mess with these flags on local externs; they remain
1953 external even if there's a declaration at file scope which
1955 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1956 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1958 /* An extern decl does not override previous storage class. */
1959 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1960 if (! DECL_EXTERNAL (newdecl))
1961 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1965 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1966 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1969 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1971 /* If either decl says `inline', this fn is inline,
1972 unless its definition was passed already. */
1973 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
1974 DECL_INLINE (olddecl) = 1;
1976 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1978 if (DECL_BUILT_IN (olddecl))
1980 /* Get rid of any built-in function if new arg types don't match it
1981 or if we have a function definition. */
1982 if (! types_match || new_is_definition)
1984 if (! different_binding_level)
1986 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1987 DECL_BUILT_IN_CLASS (olddecl) = NOT_BUILT_IN;
1992 /* If redeclaring a builtin function, and not a definition,
1993 it stays built in. */
1994 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1995 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1998 /* Also preserve various other info from the definition. */
1999 else if (! new_is_definition)
2000 DECL_FRAME_SIZE (newdecl) = DECL_FRAME_SIZE (olddecl);
2001 if (! new_is_definition)
2003 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2004 /* When called with different_binding_level set, don't copy over
2005 DECL_INITIAL, so that we don't accidentally change function
2006 declarations into function definitions. */
2007 if (! different_binding_level)
2008 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2009 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
2010 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2011 if (DECL_INLINE (newdecl))
2012 DECL_ABSTRACT_ORIGIN (newdecl) = DECL_ABSTRACT_ORIGIN (olddecl);
2015 if (different_binding_level)
2018 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2019 But preserve OLDDECL's DECL_UID. */
2021 register unsigned olddecl_uid = DECL_UID (olddecl);
2023 bcopy ((char *) newdecl + sizeof (struct tree_common),
2024 (char *) olddecl + sizeof (struct tree_common),
2025 sizeof (struct tree_decl) - sizeof (struct tree_common));
2026 DECL_UID (olddecl) = olddecl_uid;
2029 /* NEWDECL contains the merged attribute lists.
2030 Update OLDDECL to be the same. */
2031 DECL_MACHINE_ATTRIBUTES (olddecl) = DECL_MACHINE_ATTRIBUTES (newdecl);
2036 /* Record a decl-node X as belonging to the current lexical scope.
2037 Check for errors (such as an incompatible declaration for the same
2038 name already seen in the same scope).
2040 Returns either X or an old decl for the same name.
2041 If an old decl is returned, it may have been smashed
2042 to agree with what X says. */
2049 register tree name = DECL_NAME (x);
2050 register struct binding_level *b = current_binding_level;
2052 DECL_CONTEXT (x) = current_function_decl;
2053 /* A local extern declaration for a function doesn't constitute nesting.
2054 A local auto declaration does, since it's a forward decl
2055 for a nested function coming later. */
2056 if (TREE_CODE (x) == FUNCTION_DECL && DECL_INITIAL (x) == 0
2057 && DECL_EXTERNAL (x))
2058 DECL_CONTEXT (x) = 0;
2060 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
2061 && x != IDENTIFIER_IMPLICIT_DECL (name)
2062 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
2063 && !DECL_IN_SYSTEM_HEADER (x))
2064 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
2070 int different_binding_level = 0;
2072 t = lookup_name_current_level (name);
2073 /* Don't type check externs here when -traditional. This is so that
2074 code with conflicting declarations inside blocks will get warnings
2075 not errors. X11 for instance depends on this. */
2076 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
2078 t = IDENTIFIER_GLOBAL_VALUE (name);
2079 /* Type decls at global scope don't conflict with externs declared
2080 inside lexical blocks. */
2081 if (t && TREE_CODE (t) == TYPE_DECL)
2083 different_binding_level = 1;
2085 if (t != 0 && t == error_mark_node)
2086 /* error_mark_node is 0 for a while during initialization! */
2089 error_with_decl (x, "`%s' used prior to declaration");
2094 file = DECL_SOURCE_FILE (t);
2095 line = DECL_SOURCE_LINE (t);
2098 /* If this decl is `static' and an implicit decl was seen previously,
2099 warn. But don't complain if -traditional,
2100 since traditional compilers don't complain. */
2101 if (! flag_traditional && TREE_PUBLIC (name)
2102 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2103 sets this for all functions. */
2104 && ! TREE_PUBLIC (x)
2105 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2106 /* We used to warn also for explicit extern followed by static,
2107 but sometimes you need to do it that way. */
2108 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2110 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2111 IDENTIFIER_POINTER (name));
2112 pedwarn_with_file_and_line
2113 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2114 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2115 "previous declaration of `%s'",
2116 IDENTIFIER_POINTER (name));
2117 TREE_THIS_VOLATILE (name) = 1;
2120 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2122 if (TREE_CODE (t) == PARM_DECL)
2124 /* Don't allow more than one "real" duplicate
2125 of a forward parm decl. */
2126 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2132 /* If we are processing a typedef statement, generate a whole new
2133 ..._TYPE node (which will be just an variant of the existing
2134 ..._TYPE node with identical properties) and then install the
2135 TYPE_DECL node generated to represent the typedef name as the
2136 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2138 The whole point here is to end up with a situation where each
2139 and every ..._TYPE node the compiler creates will be uniquely
2140 associated with AT MOST one node representing a typedef name.
2141 This way, even though the compiler substitutes corresponding
2142 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2143 early on, later parts of the compiler can always do the reverse
2144 translation and get back the corresponding typedef name. For
2147 typedef struct S MY_TYPE;
2150 Later parts of the compiler might only know that `object' was of
2151 type `struct S' if it were not for code just below. With this
2152 code however, later parts of the compiler see something like:
2154 struct S' == struct S
2155 typedef struct S' MY_TYPE;
2158 And they can then deduce (from the node for type struct S') that
2159 the original object declaration was:
2163 Being able to do this is important for proper support of protoize,
2164 and also for generating precise symbolic debugging information
2165 which takes full account of the programmer's (typedef) vocabulary.
2167 Obviously, we don't want to generate a duplicate ..._TYPE node if
2168 the TYPE_DECL node that we are now processing really represents a
2169 standard built-in type.
2171 Since all standard types are effectively declared at line zero
2172 in the source file, we can easily check to see if we are working
2173 on a standard type by checking the current value of lineno. */
2175 if (TREE_CODE (x) == TYPE_DECL)
2177 if (DECL_SOURCE_LINE (x) == 0)
2179 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2180 TYPE_NAME (TREE_TYPE (x)) = x;
2182 else if (TREE_TYPE (x) != error_mark_node
2183 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2185 tree tt = TREE_TYPE (x);
2186 DECL_ORIGINAL_TYPE (x) = tt;
2187 tt = build_type_copy (tt);
2189 TREE_USED (tt) = TREE_USED (x);
2194 /* Multiple external decls of the same identifier ought to match.
2195 Check against both global declarations (when traditional) and out of
2196 scope (limbo) block level declarations.
2198 We get warnings about inline functions where they are defined.
2199 Avoid duplicate warnings where they are used. */
2201 && ! (TREE_CODE (x) == FUNCTION_DECL && DECL_INLINE (x)))
2205 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2206 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2207 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2208 decl = IDENTIFIER_GLOBAL_VALUE (name);
2209 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2210 /* Decls in limbo are always extern, so no need to check that. */
2211 decl = IDENTIFIER_LIMBO_VALUE (name);
2215 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2216 /* If old decl is built-in, we already warned if we should. */
2217 && !DECL_BUILT_IN (decl))
2219 pedwarn_with_decl (x,
2220 "type mismatch with previous external decl");
2221 pedwarn_with_decl (decl, "previous external decl of `%s'");
2225 /* If a function has had an implicit declaration, and then is defined,
2226 make sure they are compatible. */
2228 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2229 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2230 && TREE_CODE (x) == FUNCTION_DECL
2231 && ! comptypes (TREE_TYPE (x),
2232 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2234 warning_with_decl (x, "type mismatch with previous implicit declaration");
2235 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2236 "previous implicit declaration of `%s'");
2239 /* In PCC-compatibility mode, extern decls of vars with no current decl
2240 take effect at top level no matter where they are. */
2241 if (flag_traditional && DECL_EXTERNAL (x)
2242 && lookup_name (name) == 0)
2244 tree type = TREE_TYPE (x);
2246 /* But don't do this if the type contains temporary nodes. */
2249 if (type == error_mark_node)
2251 if (TYPE_CONTEXT (type))
2253 warning_with_decl (x, "type of external `%s' is not global");
2254 /* By exiting the loop early, we leave TYPE nonzero,
2255 and thus prevent globalization of the decl. */
2258 else if (TREE_CODE (type) == FUNCTION_TYPE
2259 && TYPE_ARG_TYPES (type) != 0)
2260 /* The types might not be truly local,
2261 but the list of arg types certainly is temporary.
2262 Since prototypes are nontraditional,
2263 ok not to do the traditional thing. */
2265 type = TREE_TYPE (type);
2269 b = global_binding_level;
2272 /* This name is new in its binding level.
2273 Install the new declaration and return it. */
2274 if (b == global_binding_level)
2276 /* Install a global value. */
2278 /* If the first global decl has external linkage,
2279 warn if we later see static one. */
2280 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2281 TREE_PUBLIC (name) = 1;
2283 IDENTIFIER_GLOBAL_VALUE (name) = x;
2285 /* We no longer care about any previous block level declarations. */
2286 IDENTIFIER_LIMBO_VALUE (name) = 0;
2288 /* Don't forget if the function was used via an implicit decl. */
2289 if (IDENTIFIER_IMPLICIT_DECL (name)
2290 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2291 TREE_USED (x) = 1, TREE_USED (name) = 1;
2293 /* Don't forget if its address was taken in that way. */
2294 if (IDENTIFIER_IMPLICIT_DECL (name)
2295 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2296 TREE_ADDRESSABLE (x) = 1;
2298 /* Warn about mismatches against previous implicit decl. */
2299 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2300 /* If this real decl matches the implicit, don't complain. */
2301 && ! (TREE_CODE (x) == FUNCTION_DECL
2302 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2303 == integer_type_node)))
2304 pedwarn ("`%s' was previously implicitly declared to return `int'",
2305 IDENTIFIER_POINTER (name));
2307 /* If this decl is `static' and an `extern' was seen previously,
2308 that is erroneous. */
2309 if (TREE_PUBLIC (name)
2310 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2312 /* Okay to redeclare an ANSI built-in as static. */
2313 if (t != 0 && DECL_BUILT_IN (t))
2315 /* Okay to declare a non-ANSI built-in as anything. */
2316 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2318 /* Okay to have global type decl after an earlier extern
2319 declaration inside a lexical block. */
2320 else if (TREE_CODE (x) == TYPE_DECL)
2322 else if (IDENTIFIER_IMPLICIT_DECL (name))
2324 if (! TREE_THIS_VOLATILE (name))
2325 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2326 IDENTIFIER_POINTER (name));
2329 pedwarn ("`%s' was declared `extern' and later `static'",
2330 IDENTIFIER_POINTER (name));
2335 /* Here to install a non-global value. */
2336 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2337 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2339 IDENTIFIER_LOCAL_VALUE (name) = x;
2341 /* If this is an extern function declaration, see if we
2342 have a global definition or declaration for the function. */
2345 && TREE_CODE (x) == FUNCTION_DECL
2346 && TREE_CODE (oldglobal) == FUNCTION_DECL
2347 && DECL_EXTERNAL (x) && ! DECL_INLINE (x))
2349 /* We have one. Their types must agree. */
2350 if (! comptypes (TREE_TYPE (x),
2351 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2352 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2355 /* Inner extern decl is inline if global one is.
2356 Copy enough to really inline it. */
2357 if (DECL_INLINE (oldglobal))
2359 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2360 DECL_INITIAL (x) = (current_function_decl == oldglobal
2361 ? 0 : DECL_INITIAL (oldglobal));
2362 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2363 DECL_FRAME_SIZE (x) = DECL_FRAME_SIZE (oldglobal);
2364 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2365 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2366 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2367 DECL_ABSTRACT_ORIGIN (x)
2368 = DECL_ABSTRACT_ORIGIN (oldglobal);
2370 /* Inner extern decl is built-in if global one is. */
2371 if (DECL_BUILT_IN (oldglobal))
2373 DECL_BUILT_IN_CLASS (x) = DECL_BUILT_IN_CLASS (oldglobal);
2374 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2376 /* Keep the arg types from a file-scope fcn defn. */
2377 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2378 && DECL_INITIAL (oldglobal)
2379 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2380 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2385 /* This case is probably sometimes the right thing to do. */
2386 /* If we have a local external declaration,
2387 then any file-scope declaration should not
2388 have been static. */
2389 if (oldlocal == 0 && oldglobal != 0
2390 && !TREE_PUBLIC (oldglobal)
2391 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2392 warning ("`%s' locally external but globally static",
2393 IDENTIFIER_POINTER (name));
2396 /* If we have a local external declaration,
2397 and no file-scope declaration has yet been seen,
2398 then if we later have a file-scope decl it must not be static. */
2400 && DECL_EXTERNAL (x)
2404 TREE_PUBLIC (name) = 1;
2406 /* Save this decl, so that we can do type checking against
2407 other decls after it falls out of scope.
2409 Only save it once. This prevents temporary decls created in
2410 expand_inline_function from being used here, since this
2411 will have been set when the inline function was parsed.
2412 It also helps give slightly better warnings. */
2413 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2414 IDENTIFIER_LIMBO_VALUE (name) = x;
2417 /* Warn if shadowing an argument at the top level of the body. */
2418 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2419 /* This warning doesn't apply to the parms of a nested fcn. */
2420 && ! current_binding_level->parm_flag
2421 /* Check that this is one level down from the parms. */
2422 && current_binding_level->level_chain->parm_flag
2423 /* Check that the decl being shadowed
2424 comes from the parm level, one level up. */
2425 && chain_member (oldlocal, current_binding_level->level_chain->names))
2427 if (TREE_CODE (oldlocal) == PARM_DECL)
2428 pedwarn ("declaration of `%s' shadows a parameter",
2429 IDENTIFIER_POINTER (name));
2431 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2432 IDENTIFIER_POINTER (name));
2435 /* Maybe warn if shadowing something else. */
2436 else if (warn_shadow && !DECL_EXTERNAL (x)
2437 /* No shadow warnings for internally generated vars. */
2438 && DECL_SOURCE_LINE (x) != 0
2439 /* No shadow warnings for vars made for inlining. */
2440 && ! DECL_FROM_INLINE (x))
2442 const char *id = IDENTIFIER_POINTER (name);
2444 if (TREE_CODE (x) == PARM_DECL
2445 && current_binding_level->level_chain->parm_flag)
2446 /* Don't warn about the parm names in function declarator
2447 within a function declarator.
2448 It would be nice to avoid warning in any function
2449 declarator in a declaration, as opposed to a definition,
2450 but there is no way to tell it's not a definition. */
2452 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2453 warning ("declaration of `%s' shadows a parameter", id);
2454 else if (oldlocal != 0)
2455 warning ("declaration of `%s' shadows previous local", id);
2456 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2457 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2458 warning ("declaration of `%s' shadows global declaration", id);
2461 /* If storing a local value, there may already be one (inherited).
2462 If so, record it for restoration when this binding level ends. */
2464 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2467 /* Keep count of variables in this level with incomplete type.
2468 If the input is erroneous, we can have error_mark in the type
2469 slot (e.g. "f(void a, ...)") - that doesn't count as an
2471 if (TREE_TYPE (x) != error_mark_node
2472 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2476 /* Put decls on list in reverse order.
2477 We will reverse them later if necessary. */
2478 TREE_CHAIN (x) = b->names;
2484 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2487 pushdecl_top_level (x)
2491 register struct binding_level *b = current_binding_level;
2493 current_binding_level = global_binding_level;
2495 current_binding_level = b;
2499 /* Generate an implicit declaration for identifier FUNCTIONID
2500 as a function of type int (). Print a warning if appropriate. */
2503 implicitly_declare (functionid)
2507 int traditional_warning = 0;
2508 /* Only one "implicit declaration" warning per identifier. */
2509 int implicit_warning;
2511 /* We used to reuse an old implicit decl here,
2512 but this loses with inline functions because it can clobber
2513 the saved decl chains. */
2515 if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2516 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2519 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2521 /* Warn of implicit decl following explicit local extern decl.
2522 This is probably a program designed for traditional C. */
2523 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2524 traditional_warning = 1;
2526 /* Warn once of an implicit declaration. */
2527 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2529 DECL_EXTERNAL (decl) = 1;
2530 TREE_PUBLIC (decl) = 1;
2532 /* Record that we have an implicit decl and this is it. */
2533 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2535 /* ANSI standard says implicit declarations are in the innermost block.
2536 So we record the decl in the standard fashion.
2537 If flag_traditional is set, pushdecl does it top-level. */
2540 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2541 maybe_objc_check_decl (decl);
2543 rest_of_decl_compilation (decl, NULL_PTR, 0, 0);
2545 if (implicit_warning)
2546 implicit_decl_warning (functionid);
2547 else if (warn_traditional && traditional_warning)
2548 warning ("function `%s' was previously declared within a block",
2549 IDENTIFIER_POINTER (functionid));
2551 /* Write a record describing this implicit function declaration to the
2552 prototypes file (if requested). */
2554 gen_aux_info_record (decl, 0, 1, 0);
2560 implicit_decl_warning (id)
2563 const char *name = IDENTIFIER_POINTER (id);
2564 if (mesg_implicit_function_declaration == 2)
2565 error ("implicit declaration of function `%s'", name);
2566 else if (mesg_implicit_function_declaration == 1)
2567 warning ("implicit declaration of function `%s'", name);
2570 /* Return zero if the declaration NEWDECL is valid
2571 when the declaration OLDDECL (assumed to be for the same name)
2572 has already been seen.
2573 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
2574 and 3 if it is a conflicting declaration. */
2577 redeclaration_error_message (newdecl, olddecl)
2578 tree newdecl, olddecl;
2580 if (TREE_CODE (newdecl) == TYPE_DECL)
2582 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2584 /* pushdecl creates distinct types for TYPE_DECLs by calling
2585 build_type_copy, so the above comparison generally fails. We do
2586 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2587 is equivalent to what this code used to do before the build_type_copy
2588 call. The variant type distinction should not matter for traditional
2589 code, because it doesn't have type qualifiers. */
2590 if (flag_traditional
2591 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
2593 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2597 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2599 /* Declarations of functions can insist on internal linkage
2600 but they can't be inconsistent with internal linkage,
2601 so there can be no error on that account.
2602 However defining the same name twice is no good. */
2603 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2604 /* However, defining once as extern inline and a second
2605 time in another way is ok. */
2606 && ! (DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2607 && ! (DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2611 else if (current_binding_level == global_binding_level)
2613 /* Objects declared at top level: */
2614 /* If at least one is a reference, it's ok. */
2615 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2617 /* Reject two definitions. */
2618 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2620 /* Now we have two tentative defs, or one tentative and one real def. */
2621 /* Insist that the linkage match. */
2622 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2626 else if (current_binding_level->parm_flag
2627 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2631 /* Newdecl has block scope. If olddecl has block scope also, then
2632 reject two definitions, and reject a definition together with an
2633 external reference. Otherwise, it is OK, because newdecl must
2634 be an extern reference to olddecl. */
2635 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2636 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2642 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2643 Create one if none exists so far for the current function.
2644 This function is called for both label definitions and label references. */
2650 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2652 if (current_function_decl == 0)
2654 error ("label %s referenced outside of any function",
2655 IDENTIFIER_POINTER (id));
2659 /* Use a label already defined or ref'd with this name. */
2662 /* But not if it is inherited and wasn't declared to be inheritable. */
2663 if (DECL_CONTEXT (decl) != current_function_decl
2664 && ! C_DECLARED_LABEL_FLAG (decl))
2665 return shadow_label (id);
2669 decl = build_decl (LABEL_DECL, id, void_type_node);
2671 /* Make sure every label has an rtx. */
2674 /* A label not explicitly declared must be local to where it's ref'd. */
2675 DECL_CONTEXT (decl) = current_function_decl;
2677 DECL_MODE (decl) = VOIDmode;
2679 /* Say where one reference is to the label,
2680 for the sake of the error if it is not defined. */
2681 DECL_SOURCE_LINE (decl) = lineno;
2682 DECL_SOURCE_FILE (decl) = input_filename;
2684 IDENTIFIER_LABEL_VALUE (id) = decl;
2686 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2691 /* Make a label named NAME in the current function,
2692 shadowing silently any that may be inherited from containing functions
2693 or containing scopes.
2695 Note that valid use, if the label being shadowed
2696 comes from another scope in the same function,
2697 requires calling declare_nonlocal_label right away. */
2703 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2709 /* Check to make sure that the label hasn't already been declared
2710 at this label scope */
2711 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2712 if (TREE_VALUE (dup) == decl)
2714 error ("duplicate label declaration `%s'",
2715 IDENTIFIER_POINTER (name));
2716 error_with_decl (TREE_VALUE (dup),
2717 "this is a previous declaration");
2718 /* Just use the previous declaration. */
2719 return lookup_label (name);
2722 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2723 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2726 return lookup_label (name);
2729 /* Define a label, specifying the location in the source file.
2730 Return the LABEL_DECL node for the label, if the definition is valid.
2731 Otherwise return 0. */
2734 define_label (filename, line, name)
2735 const char *filename;
2739 tree decl = lookup_label (name);
2741 /* If label with this name is known from an outer context, shadow it. */
2742 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2744 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2745 IDENTIFIER_LABEL_VALUE (name) = 0;
2746 decl = lookup_label (name);
2749 if (warn_traditional && !in_system_header && lookup_name (name))
2750 warning_with_file_and_line (filename, line,
2751 "traditional C lacks a separate namespace for labels, identifier `%s' conflicts",
2752 IDENTIFIER_POINTER (name));
2754 if (DECL_INITIAL (decl) != 0)
2756 error_with_file_and_line (filename, line, "duplicate label `%s'",
2757 IDENTIFIER_POINTER (name));
2762 /* Mark label as having been defined. */
2763 DECL_INITIAL (decl) = error_mark_node;
2764 /* Say where in the source. */
2765 DECL_SOURCE_FILE (decl) = filename;
2766 DECL_SOURCE_LINE (decl) = line;
2771 /* Return the list of declarations of the current level.
2772 Note that this list is in reverse order unless/until
2773 you nreverse it; and when you do nreverse it, you must
2774 store the result back using `storedecls' or you will lose. */
2779 return current_binding_level->names;
2782 /* Return the list of type-tags (for structs, etc) of the current level. */
2787 return current_binding_level->tags;
2790 /* Store the list of declarations of the current level.
2791 This is done for the parameter declarations of a function being defined,
2792 after they are modified in the light of any missing parameters. */
2798 current_binding_level->names = decls;
2801 /* Similarly, store the list of tags of the current level. */
2807 current_binding_level->tags = tags;
2810 /* Given NAME, an IDENTIFIER_NODE,
2811 return the structure (or union or enum) definition for that name.
2812 Searches binding levels from BINDING_LEVEL up to the global level.
2813 If THISLEVEL_ONLY is nonzero, searches only the specified context
2814 (but skips any tag-transparent contexts to find one that is
2815 meaningful for tags).
2816 CODE says which kind of type the caller wants;
2817 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2818 If the wrong kind of type is found, an error is reported. */
2821 lookup_tag (code, name, binding_level, thislevel_only)
2822 enum tree_code code;
2823 struct binding_level *binding_level;
2827 register struct binding_level *level;
2829 for (level = binding_level; level; level = level->level_chain)
2832 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2834 if (TREE_PURPOSE (tail) == name)
2836 if (TREE_CODE (TREE_VALUE (tail)) != code)
2838 /* Definition isn't the kind we were looking for. */
2839 pending_invalid_xref = name;
2840 pending_invalid_xref_file = input_filename;
2841 pending_invalid_xref_line = lineno;
2843 return TREE_VALUE (tail);
2846 if (thislevel_only && ! level->tag_transparent)
2852 /* Print an error message now
2853 for a recent invalid struct, union or enum cross reference.
2854 We don't print them immediately because they are not invalid
2855 when used in the `struct foo;' construct for shadowing. */
2858 pending_xref_error ()
2860 if (pending_invalid_xref != 0)
2861 error_with_file_and_line (pending_invalid_xref_file,
2862 pending_invalid_xref_line,
2863 "`%s' defined as wrong kind of tag",
2864 IDENTIFIER_POINTER (pending_invalid_xref));
2865 pending_invalid_xref = 0;
2868 /* Given a type, find the tag that was defined for it and return the tag name.
2869 Otherwise return 0. */
2872 lookup_tag_reverse (type)
2875 register struct binding_level *level;
2877 for (level = current_binding_level; level; level = level->level_chain)
2880 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2882 if (TREE_VALUE (tail) == type)
2883 return TREE_PURPOSE (tail);
2889 /* Look up NAME in the current binding level and its superiors
2890 in the namespace of variables, functions and typedefs.
2891 Return a ..._DECL node of some kind representing its definition,
2892 or return 0 if it is undefined. */
2899 if (current_binding_level != global_binding_level
2900 && IDENTIFIER_LOCAL_VALUE (name))
2901 val = IDENTIFIER_LOCAL_VALUE (name);
2903 val = IDENTIFIER_GLOBAL_VALUE (name);
2907 /* Similar to `lookup_name' but look only at current binding level. */
2910 lookup_name_current_level (name)
2915 if (current_binding_level == global_binding_level)
2916 return IDENTIFIER_GLOBAL_VALUE (name);
2918 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2921 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2922 if (DECL_NAME (t) == name)
2928 /* Mark ARG for GC. */
2931 mark_binding_level (arg)
2934 struct binding_level *level = *(struct binding_level **) arg;
2936 for (; level != 0; level = level->level_chain)
2938 ggc_mark_tree (level->names);
2939 ggc_mark_tree (level->tags);
2940 ggc_mark_tree (level->shadowed);
2941 ggc_mark_tree (level->blocks);
2942 ggc_mark_tree (level->this_block);
2943 ggc_mark_tree (level->parm_order);
2947 /* Create the predefined scalar types of C,
2948 and some nodes representing standard constants (0, 1, (void *) 0).
2949 Initialize the global binding level.
2950 Make definitions for built-in primitive functions. */
2953 init_decl_processing ()
2955 register tree endlink;
2956 tree ptr_ftype_void, ptr_ftype_ptr;
2957 int wchar_type_size;
2958 tree array_domain_type;
2961 current_function_decl = NULL;
2962 named_labels = NULL;
2963 current_binding_level = NULL_BINDING_LEVEL;
2964 free_binding_level = NULL_BINDING_LEVEL;
2966 /* Make the binding_level structure for global names. */
2968 global_binding_level = current_binding_level;
2970 build_common_tree_nodes (flag_signed_char);
2972 /* Define `int' and `char' first so that dbx will output them first. */
2973 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_INT],
2974 integer_type_node));
2975 pushdecl (build_decl (TYPE_DECL, get_identifier ("char"),
2977 pushdecl (build_decl (TYPE_DECL, get_identifier ("long int"),
2978 long_integer_type_node));
2979 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned int"),
2980 unsigned_type_node));
2981 pushdecl (build_decl (TYPE_DECL, get_identifier ("long unsigned int"),
2982 long_unsigned_type_node));
2983 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long int"),
2984 long_long_integer_type_node));
2985 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long unsigned int"),
2986 long_long_unsigned_type_node));
2987 pushdecl (build_decl (TYPE_DECL, get_identifier ("short int"),
2988 short_integer_type_node));
2989 pushdecl (build_decl (TYPE_DECL, get_identifier ("short unsigned int"),
2990 short_unsigned_type_node));
2991 pushdecl (build_decl (TYPE_DECL, get_identifier ("signed char"),
2992 signed_char_type_node));
2993 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned char"),
2994 unsigned_char_type_node));
2995 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intQI_type_node));
2996 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intHI_type_node));
2997 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intSI_type_node));
2998 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
2999 #if HOST_BITS_PER_WIDE_INT >= 64
3000 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intTI_type_node));
3002 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node));
3003 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intHI_type_node));
3004 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intSI_type_node));
3005 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node));
3006 #if HOST_BITS_PER_WIDE_INT >= 64
3007 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intTI_type_node));
3010 /* `unsigned long' is the standard type for sizeof.
3011 Traditionally, use a signed type.
3012 Note that stddef.h uses `unsigned long',
3013 and this must agree, even if long and int are the same size. */
3014 t = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE)));
3015 signed_size_type_node = signed_type (t);
3016 if (flag_traditional && TREE_UNSIGNED (t))
3017 t = signed_type (t);
3019 c_size_type_node = t;
3022 /* Create the widest literal types. */
3023 widest_integer_literal_type_node
3024 = make_signed_type (HOST_BITS_PER_WIDE_INT * 2);
3025 widest_unsigned_literal_type_node
3026 = make_unsigned_type (HOST_BITS_PER_WIDE_INT * 2);
3027 pushdecl (build_decl (TYPE_DECL, NULL_TREE,
3028 widest_integer_literal_type_node));
3029 pushdecl (build_decl (TYPE_DECL, NULL_TREE,
3030 widest_unsigned_literal_type_node));
3032 build_common_tree_nodes_2 (flag_short_double);
3034 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_FLOAT],
3036 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_DOUBLE],
3038 pushdecl (build_decl (TYPE_DECL, get_identifier ("long double"),
3039 long_double_type_node));
3040 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex int"),
3041 complex_integer_type_node));
3042 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex float"),
3043 complex_float_type_node));
3044 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex double"),
3045 complex_double_type_node));
3046 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex long double"),
3047 complex_long_double_type_node));
3048 pushdecl (build_decl (TYPE_DECL,
3049 ridpointers[(int) RID_VOID], void_type_node));
3051 #ifdef MD_INIT_BUILTINS
3055 wchar_type_node = get_identifier (flag_short_wchar
3056 ? "short unsigned int"
3058 wchar_type_node = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (wchar_type_node));
3059 wchar_type_size = TYPE_PRECISION (wchar_type_node);
3060 signed_wchar_type_node = signed_type (wchar_type_node);
3061 unsigned_wchar_type_node = unsigned_type (wchar_type_node);
3064 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (WINT_TYPE)));
3066 boolean_type_node = integer_type_node;
3067 boolean_true_node = integer_one_node;
3068 boolean_false_node = integer_zero_node;
3070 string_type_node = build_pointer_type (char_type_node);
3071 const_string_type_node
3072 = build_pointer_type (build_type_variant (char_type_node, 1, 0));
3074 /* Make a type to be the domain of a few array types
3075 whose domains don't really matter.
3076 200 is small enough that it always fits in size_t
3077 and large enough that it can hold most function names for the
3078 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
3079 array_domain_type = build_index_type (build_int_2 (200, 0));
3081 /* make a type for arrays of characters.
3082 With luck nothing will ever really depend on the length of this
3084 char_array_type_node = build_array_type (char_type_node, array_domain_type);
3086 /* Likewise for arrays of ints. */
3088 = build_array_type (integer_type_node, array_domain_type);
3090 /* This is for wide string constants. */
3091 wchar_array_type_node
3092 = build_array_type (wchar_type_node, array_domain_type);
3094 void_list_node = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
3096 default_function_type = build_function_type (integer_type_node, NULL_TREE);
3098 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE)));
3099 unsigned_ptrdiff_type_node = unsigned_type (ptrdiff_type_node);
3101 c_common_nodes_and_builtins (0, flag_no_builtin, flag_no_nonansi_builtin);
3103 endlink = void_list_node;
3104 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
3106 = build_function_type (ptr_type_node,
3107 tree_cons (NULL_TREE, ptr_type_node, endlink));
3109 /* Types which are common to the fortran compiler and libf2c. When
3110 changing these, you also need to be concerned with f/com.h. */
3112 if (TYPE_PRECISION (float_type_node)
3113 == TYPE_PRECISION (long_integer_type_node))
3115 g77_integer_type_node = long_integer_type_node;
3116 g77_uinteger_type_node = long_unsigned_type_node;
3118 else if (TYPE_PRECISION (float_type_node)
3119 == TYPE_PRECISION (integer_type_node))
3121 g77_integer_type_node = integer_type_node;
3122 g77_uinteger_type_node = unsigned_type_node;
3125 g77_integer_type_node = g77_uinteger_type_node = NULL_TREE;
3127 if (g77_integer_type_node != NULL_TREE)
3129 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_integer"),
3130 g77_integer_type_node));
3131 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_uinteger"),
3132 g77_uinteger_type_node));
3135 if (TYPE_PRECISION (float_type_node) * 2
3136 == TYPE_PRECISION (long_integer_type_node))
3138 g77_longint_type_node = long_integer_type_node;
3139 g77_ulongint_type_node = long_unsigned_type_node;
3141 else if (TYPE_PRECISION (float_type_node) * 2
3142 == TYPE_PRECISION (long_long_integer_type_node))
3144 g77_longint_type_node = long_long_integer_type_node;
3145 g77_ulongint_type_node = long_long_unsigned_type_node;
3148 g77_longint_type_node = g77_ulongint_type_node = NULL_TREE;
3150 if (g77_longint_type_node != NULL_TREE)
3152 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_longint"),
3153 g77_longint_type_node));
3154 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_ulongint"),
3155 g77_ulongint_type_node));
3158 builtin_function ("__builtin_aggregate_incoming_address",
3159 build_function_type (ptr_type_node, NULL_TREE),
3160 BUILT_IN_AGGREGATE_INCOMING_ADDRESS,
3161 BUILT_IN_NORMAL, NULL_PTR);
3163 /* Hooks for the DWARF 2 __throw routine. */
3164 builtin_function ("__builtin_unwind_init",
3165 build_function_type (void_type_node, endlink),
3166 BUILT_IN_UNWIND_INIT, BUILT_IN_NORMAL, NULL_PTR);
3167 builtin_function ("__builtin_dwarf_cfa", ptr_ftype_void,
3168 BUILT_IN_DWARF_CFA, BUILT_IN_NORMAL, NULL_PTR);
3169 builtin_function ("__builtin_dwarf_fp_regnum",
3170 build_function_type (unsigned_type_node, endlink),
3171 BUILT_IN_DWARF_FP_REGNUM, BUILT_IN_NORMAL, NULL_PTR);
3172 builtin_function ("__builtin_init_dwarf_reg_size_table", void_ftype_ptr,
3173 BUILT_IN_INIT_DWARF_REG_SIZES, BUILT_IN_NORMAL, NULL_PTR);
3174 builtin_function ("__builtin_frob_return_addr", ptr_ftype_ptr,
3175 BUILT_IN_FROB_RETURN_ADDR, BUILT_IN_NORMAL, NULL_PTR);
3176 builtin_function ("__builtin_extract_return_addr", ptr_ftype_ptr,
3177 BUILT_IN_EXTRACT_RETURN_ADDR, BUILT_IN_NORMAL, NULL_PTR);
3179 ("__builtin_eh_return",
3180 build_function_type (void_type_node,
3181 tree_cons (NULL_TREE, ptr_type_node,
3182 tree_cons (NULL_TREE,
3183 type_for_mode (ptr_mode, 0),
3184 tree_cons (NULL_TREE,
3187 BUILT_IN_EH_RETURN, BUILT_IN_NORMAL, NULL_PTR);
3189 pedantic_lvalues = pedantic;
3191 /* Create the global bindings for __FUNCTION__, __PRETTY_FUNCTION__,
3193 function_id_node = get_identifier ("__FUNCTION__");
3194 pretty_function_id_node = get_identifier ("__PRETTY_FUNCTION__");
3195 func_id_node = get_identifier ("__func__");
3196 make_fname_decl = c_make_fname_decl;
3197 declare_function_name ();
3199 start_identifier_warnings ();
3201 /* Prepare to check format strings against argument lists. */
3202 init_function_format_info ();
3204 incomplete_decl_finalize_hook = finish_incomplete_decl;
3206 /* Record our roots. */
3208 ggc_add_tree_root (c_global_trees, CTI_MAX);
3209 ggc_add_tree_root (&named_labels, 1);
3210 ggc_add_tree_root (&shadowed_labels, 1);
3211 ggc_add_root (¤t_binding_level, 1, sizeof current_binding_level,
3212 mark_binding_level);
3213 ggc_add_root (&label_level_chain, 1, sizeof label_level_chain,
3214 mark_binding_level);
3215 ggc_add_tree_root (&static_ctors, 1);
3216 ggc_add_tree_root (&static_dtors, 1);
3219 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3220 decl, NAME is the initialization string and TYPE_DEP indicates whether
3221 NAME depended on the type of the function. As we don't yet implement
3222 delayed emission of static data, we mark the decl as emitted
3223 so it is not placed in the output. Anything using it must therefore pull
3224 out the STRING_CST initializer directly. This does mean that these names
3225 are string merging candidates, which is wrong for C99's __func__. FIXME. */
3228 c_make_fname_decl (id, name, type_dep)
3231 int type_dep ATTRIBUTE_UNUSED;
3233 tree decl, type, init;
3234 size_t length = strlen (name);
3236 type = build_array_type
3237 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
3238 build_index_type (build_int_2 (length, 0)));
3240 decl = build_decl (VAR_DECL, id, type);
3241 TREE_STATIC (decl) = 1;
3242 TREE_READONLY (decl) = 1;
3243 TREE_ASM_WRITTEN (decl) = 1;
3244 DECL_SOURCE_LINE (decl) = 0;
3245 DECL_ARTIFICIAL (decl) = 1;
3246 DECL_IN_SYSTEM_HEADER (decl) = 1;
3247 DECL_IGNORED_P (decl) = 1;
3248 init = build_string (length + 1, name);
3249 TREE_TYPE (init) = type;
3250 DECL_INITIAL (decl) = init;
3251 finish_decl (pushdecl (decl), init, NULL_TREE);
3256 /* Return a definition for a builtin function named NAME and whose data type
3257 is TYPE. TYPE should be a function type with argument types.
3258 FUNCTION_CODE tells later passes how to compile calls to this function.
3259 See tree.h for its possible values.
3261 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3262 the name to be called if we can't opencode the function. */
3265 builtin_function (name, type, function_code, class, library_name)
3269 enum built_in_class class;
3270 const char *library_name;
3272 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3273 DECL_EXTERNAL (decl) = 1;
3274 TREE_PUBLIC (decl) = 1;
3275 /* If -traditional, permit redefining a builtin function any way you like.
3276 (Though really, if the program redefines these functions,
3277 it probably won't work right unless compiled with -fno-builtin.) */
3278 if (flag_traditional && name[0] != '_')
3279 DECL_BUILT_IN_NONANSI (decl) = 1;
3281 DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
3282 make_decl_rtl (decl, NULL_PTR, 1);
3284 DECL_BUILT_IN_CLASS (decl) = class;
3285 DECL_FUNCTION_CODE (decl) = function_code;
3287 /* Warn if a function in the namespace for users
3288 is used without an occasion to consider it declared. */
3289 if (name[0] != '_' || name[1] != '_')
3290 C_DECL_ANTICIPATED (decl) = 1;
3295 /* Called when a declaration is seen that contains no names to declare.
3296 If its type is a reference to a structure, union or enum inherited
3297 from a containing scope, shadow that tag name for the current scope
3298 with a forward reference.
3299 If its type defines a new named structure or union
3300 or defines an enum, it is valid but we need not do anything here.
3301 Otherwise, it is an error. */
3304 shadow_tag (declspecs)
3307 shadow_tag_warned (declspecs, 0);
3311 shadow_tag_warned (declspecs, warned)
3314 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3321 pending_invalid_xref = 0;
3323 /* Remove the attributes from declspecs, since they will confuse the
3325 split_specs_attrs (declspecs, &specs, &attrs);
3327 for (link = specs; link; link = TREE_CHAIN (link))
3329 register tree value = TREE_VALUE (link);
3330 register enum tree_code code = TREE_CODE (value);
3332 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3333 /* Used to test also that TYPE_SIZE (value) != 0.
3334 That caused warning for `struct foo;' at top level in the file. */
3336 register tree name = lookup_tag_reverse (value);
3343 if (warned != 1 && code != ENUMERAL_TYPE)
3344 /* Empty unnamed enum OK */
3346 pedwarn ("unnamed struct/union that defines no instances");
3352 t = lookup_tag (code, name, current_binding_level, 1);
3356 t = make_node (code);
3363 if (!warned && ! in_system_header)
3365 warning ("useless keyword or type name in empty declaration");
3372 error ("two types specified in one empty declaration");
3377 pedwarn ("empty declaration");
3381 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3384 groktypename (typename)
3387 if (TREE_CODE (typename) != TREE_LIST)
3389 return grokdeclarator (TREE_VALUE (typename),
3390 TREE_PURPOSE (typename),
3394 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3397 groktypename_in_parm_context (typename)
3400 if (TREE_CODE (typename) != TREE_LIST)
3402 return grokdeclarator (TREE_VALUE (typename),
3403 TREE_PURPOSE (typename),
3407 /* Decode a declarator in an ordinary declaration or data definition.
3408 This is called as soon as the type information and variable name
3409 have been parsed, before parsing the initializer if any.
3410 Here we create the ..._DECL node, fill in its type,
3411 and put it on the list of decls for the current context.
3412 The ..._DECL node is returned as the value.
3414 Exception: for arrays where the length is not specified,
3415 the type is left null, to be filled in by `finish_decl'.
3417 Function definitions do not come here; they go to start_function
3418 instead. However, external and forward declarations of functions
3419 do go through here. Structure field declarations are done by
3420 grokfield and not through here. */
3423 start_decl (declarator, declspecs, initialized, attributes, prefix_attributes)
3424 tree declarator, declspecs;
3426 tree attributes, prefix_attributes;
3428 register tree decl = grokdeclarator (declarator, declspecs,
3429 NORMAL, initialized);
3432 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3433 && MAIN_NAME_P (DECL_NAME (decl)))
3434 warning_with_decl (decl, "`%s' is usually a function");
3437 /* Is it valid for this decl to have an initializer at all?
3438 If not, set INITIALIZED to zero, which will indirectly
3439 tell `finish_decl' to ignore the initializer once it is parsed. */
3440 switch (TREE_CODE (decl))
3443 /* typedef foo = bar means give foo the same type as bar.
3444 We haven't parsed bar yet, so `finish_decl' will fix that up.
3445 Any other case of an initialization in a TYPE_DECL is an error. */
3446 if (pedantic || list_length (declspecs) > 1)
3448 error ("typedef `%s' is initialized",
3449 IDENTIFIER_POINTER (DECL_NAME (decl)));
3455 error ("function `%s' is initialized like a variable",
3456 IDENTIFIER_POINTER (DECL_NAME (decl)));
3461 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3462 error ("parameter `%s' is initialized",
3463 IDENTIFIER_POINTER (DECL_NAME (decl)));
3468 /* Don't allow initializations for incomplete types
3469 except for arrays which might be completed by the initialization. */
3470 if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3472 /* A complete type is ok if size is fixed. */
3474 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3475 || C_DECL_VARIABLE_SIZE (decl))
3477 error ("variable-sized object may not be initialized");
3481 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3483 error ("variable `%s' has initializer but incomplete type",
3484 IDENTIFIER_POINTER (DECL_NAME (decl)));
3487 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
3489 error ("elements of array `%s' have incomplete type",
3490 IDENTIFIER_POINTER (DECL_NAME (decl)));
3498 /* Seems redundant with grokdeclarator. */
3499 if (current_binding_level != global_binding_level
3500 && DECL_EXTERNAL (decl)
3501 && TREE_CODE (decl) != FUNCTION_DECL)
3502 warning ("declaration of `%s' has `extern' and is initialized",
3503 IDENTIFIER_POINTER (DECL_NAME (decl)));
3505 DECL_EXTERNAL (decl) = 0;
3506 if (current_binding_level == global_binding_level)
3507 TREE_STATIC (decl) = 1;
3509 /* Tell `pushdecl' this is an initialized decl
3510 even though we don't yet have the initializer expression.
3511 Also tell `finish_decl' it may store the real initializer. */
3512 DECL_INITIAL (decl) = error_mark_node;
3515 /* If this is a function declaration, write a record describing it to the
3516 prototypes file (if requested). */
3518 if (TREE_CODE (decl) == FUNCTION_DECL)
3519 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3521 /* ANSI specifies that a tentative definition which is not merged with
3522 a non-tentative definition behaves exactly like a definition with an
3523 initializer equal to zero. (Section 3.7.2)
3524 -fno-common gives strict ANSI behavior. Usually you don't want it.
3525 This matters only for variables with external linkage. */
3526 if (! flag_no_common || ! TREE_PUBLIC (decl))
3527 DECL_COMMON (decl) = 1;
3529 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
3530 SET_DEFAULT_DECL_ATTRIBUTES (decl, attributes);
3533 /* Set attributes here so if duplicate decl, will have proper attributes. */
3534 decl_attributes (decl, attributes, prefix_attributes);
3536 /* Add this decl to the current binding level.
3537 TEM may equal DECL or it may be a previous decl of the same name. */
3538 tem = pushdecl (decl);
3540 /* For a local variable, define the RTL now. */
3541 if (current_binding_level != global_binding_level
3542 /* But not if this is a duplicate decl
3543 and we preserved the rtl from the previous one
3544 (which may or may not happen). */
3545 && DECL_RTL (tem) == 0)
3547 if (COMPLETE_TYPE_P (TREE_TYPE (tem)))
3549 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3550 && DECL_INITIAL (tem) != 0)
3557 /* Finish processing of a declaration;
3558 install its initial value.
3559 If the length of an array type is not known before,
3560 it must be determined now, from the initial value, or it is an error. */
3563 finish_decl (decl, init, asmspec_tree)
3567 register tree type = TREE_TYPE (decl);
3568 int was_incomplete = (DECL_SIZE (decl) == 0);
3571 /* If a name was specified, get the string. */
3573 asmspec = TREE_STRING_POINTER (asmspec_tree);
3575 /* If `start_decl' didn't like having an initialization, ignore it now. */
3577 if (init != 0 && DECL_INITIAL (decl) == 0)
3579 /* Don't crash if parm is initialized. */
3580 if (TREE_CODE (decl) == PARM_DECL)
3585 if (TREE_CODE (decl) != TYPE_DECL)
3586 store_init_value (decl, init);
3589 /* typedef foo = bar; store the type of bar as the type of foo. */
3590 TREE_TYPE (decl) = TREE_TYPE (init);
3591 DECL_INITIAL (decl) = init = 0;
3595 /* Deduce size of array from initialization, if not already known */
3597 if (TREE_CODE (type) == ARRAY_TYPE
3598 && TYPE_DOMAIN (type) == 0
3599 && TREE_CODE (decl) != TYPE_DECL)
3602 = (TREE_STATIC (decl)
3603 /* Even if pedantic, an external linkage array
3604 may have incomplete type at first. */
3605 ? pedantic && !TREE_PUBLIC (decl)
3606 : !DECL_EXTERNAL (decl));
3608 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3610 /* Get the completed type made by complete_array_type. */
3611 type = TREE_TYPE (decl);
3614 error_with_decl (decl, "initializer fails to determine size of `%s'");
3619 error_with_decl (decl, "array size missing in `%s'");
3620 /* If a `static' var's size isn't known,
3621 make it extern as well as static, so it does not get
3623 If it is not `static', then do not mark extern;
3624 finish_incomplete_decl will give it a default size
3625 and it will get allocated. */
3626 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3627 DECL_EXTERNAL (decl) = 1;
3630 /* TYPE_MAX_VALUE is always one less than the number of elements
3631 in the array, because we start counting at zero. Therefore,
3632 warn only if the value is less than zero. */
3633 if (pedantic && TYPE_DOMAIN (type) != 0
3634 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3635 error_with_decl (decl, "zero or negative size array `%s'");
3637 layout_decl (decl, 0);
3640 if (TREE_CODE (decl) == VAR_DECL)
3642 if (DECL_SIZE (decl) == 0 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3643 layout_decl (decl, 0);
3645 if (DECL_SIZE (decl) == 0
3646 && (TREE_STATIC (decl)
3648 /* A static variable with an incomplete type
3649 is an error if it is initialized.
3650 Also if it is not file scope.
3651 Otherwise, let it through, but if it is not `extern'
3652 then it may cause an error message later. */
3653 (DECL_INITIAL (decl) != 0
3654 || DECL_CONTEXT (decl) != 0)
3656 /* An automatic variable with an incomplete type
3658 !DECL_EXTERNAL (decl)))
3660 error_with_decl (decl, "storage size of `%s' isn't known");
3661 TREE_TYPE (decl) = error_mark_node;
3664 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3665 && DECL_SIZE (decl) != 0)
3667 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3668 constant_expression_warning (DECL_SIZE (decl));
3670 error_with_decl (decl, "storage size of `%s' isn't constant");
3673 if (TREE_USED (type))
3674 TREE_USED (decl) = 1;
3677 /* If this is a function and an assembler name is specified, it isn't
3678 builtin any more. Also reset DECL_RTL so we can give it its new
3680 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3682 DECL_BUILT_IN_CLASS (decl) = NOT_BUILT_IN;
3683 DECL_RTL (decl) = 0;
3684 DECL_ASSEMBLER_NAME (decl) = get_identifier (asmspec);
3687 /* Output the assembler code and/or RTL code for variables and functions,
3688 unless the type is an undefined structure or union.
3689 If not, it will get done when the type is completed. */
3691 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3693 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3694 maybe_objc_check_decl (decl);
3695 rest_of_decl_compilation (decl, asmspec,
3696 (DECL_CONTEXT (decl) == 0
3697 || TREE_ASM_WRITTEN (decl)), 0);
3699 if (DECL_CONTEXT (decl) != 0)
3701 /* Recompute the RTL of a local array now
3702 if it used to be an incomplete type. */
3704 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3706 /* If we used it already as memory, it must stay in memory. */
3707 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3708 /* If it's still incomplete now, no init will save it. */
3709 if (DECL_SIZE (decl) == 0)
3710 DECL_INITIAL (decl) = 0;
3713 /* Compute and store the initial value. */
3714 if (TREE_CODE (decl) != FUNCTION_DECL)
3715 expand_decl_init (decl);
3719 if (TREE_CODE (decl) == TYPE_DECL)
3721 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3722 maybe_objc_check_decl (decl);
3723 rest_of_decl_compilation (decl, NULL_PTR, DECL_CONTEXT (decl) == 0, 0);
3726 /* At the end of a declaration, throw away any variable type sizes
3727 of types defined inside that declaration. There is no use
3728 computing them in the following function definition. */
3729 if (current_binding_level == global_binding_level)
3730 get_pending_sizes ();
3733 /* If DECL has a cleanup, build and return that cleanup here.
3734 This is a callback called by expand_expr. */
3737 maybe_build_cleanup (decl)
3738 tree decl ATTRIBUTE_UNUSED;
3740 /* There are no cleanups in C. */
3744 /* Given a parsed parameter declaration,
3745 decode it into a PARM_DECL and push that on the current binding level.
3746 Also, for the sake of forward parm decls,
3747 record the given order of parms in `parm_order'. */
3750 push_parm_decl (parm)
3754 int old_immediate_size_expand = immediate_size_expand;
3755 /* Don't try computing parm sizes now -- wait till fn is called. */
3756 immediate_size_expand = 0;
3758 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3759 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3760 decl_attributes (decl, TREE_VALUE (TREE_VALUE (parm)),
3761 TREE_PURPOSE (TREE_VALUE (parm)));
3764 if (DECL_NAME (decl))
3767 olddecl = lookup_name (DECL_NAME (decl));
3768 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3769 pedwarn_with_decl (decl,
3770 "ANSI C forbids parameter `%s' shadowing typedef");
3774 decl = pushdecl (decl);
3776 immediate_size_expand = old_immediate_size_expand;
3778 current_binding_level->parm_order
3779 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3781 /* Add this decl to the current binding level. */
3782 finish_decl (decl, NULL_TREE, NULL_TREE);
3785 /* Clear the given order of parms in `parm_order'.
3786 Used at start of parm list,
3787 and also at semicolon terminating forward decls. */
3792 current_binding_level->parm_order = NULL_TREE;
3795 /* Make TYPE a complete type based on INITIAL_VALUE.
3796 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3797 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3800 complete_array_type (type, initial_value, do_default)
3805 register tree maxindex = NULL_TREE;
3810 /* Note MAXINDEX is really the maximum index,
3811 one less than the size. */
3812 if (TREE_CODE (initial_value) == STRING_CST)
3815 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3816 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3819 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3821 tree elts = CONSTRUCTOR_ELTS (initial_value);
3822 maxindex = build_int_2 (-1, -1);
3823 for (; elts; elts = TREE_CHAIN (elts))
3825 if (TREE_PURPOSE (elts))
3826 maxindex = TREE_PURPOSE (elts);
3828 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3829 maxindex, integer_one_node));
3831 maxindex = copy_node (maxindex);
3835 /* Make an error message unless that happened already. */
3836 if (initial_value != error_mark_node)
3839 /* Prevent further error messages. */
3840 maxindex = build_int_2 (0, 0);
3847 maxindex = build_int_2 (0, 0);
3853 TYPE_DOMAIN (type) = build_index_type (maxindex);
3854 if (!TREE_TYPE (maxindex))
3855 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3858 /* Lay out the type now that we can get the real answer. */
3865 /* Given declspecs and a declarator,
3866 determine the name and type of the object declared
3867 and construct a ..._DECL node for it.
3868 (In one case we can return a ..._TYPE node instead.
3869 For invalid input we sometimes return 0.)
3871 DECLSPECS is a chain of tree_list nodes whose value fields
3872 are the storage classes and type specifiers.
3874 DECL_CONTEXT says which syntactic context this declaration is in:
3875 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3876 FUNCDEF for a function definition. Like NORMAL but a few different
3877 error messages in each case. Return value may be zero meaning
3878 this definition is too screwy to try to parse.
3879 PARM for a parameter declaration (either within a function prototype
3880 or before a function body). Make a PARM_DECL, or return void_type_node.
3881 TYPENAME if for a typename (in a cast or sizeof).
3882 Don't make a DECL node; just return the ..._TYPE node.
3883 FIELD for a struct or union field; make a FIELD_DECL.
3884 BITFIELD for a field with specified width.
3885 INITIALIZED is 1 if the decl has an initializer.
3887 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3888 It may also be so in the PARM case, for a prototype where the
3889 argument type is specified but not the name.
3891 This function is where the complicated C meanings of `static'
3892 and `extern' are interpreted. */
3895 grokdeclarator (declarator, declspecs, decl_context, initialized)
3898 enum decl_context decl_context;
3903 tree type = NULL_TREE;
3908 int type_quals = TYPE_UNQUALIFIED;
3910 int explicit_int = 0;
3911 int explicit_char = 0;
3912 int defaulted_int = 0;
3913 tree typedef_decl = 0;
3915 tree typedef_type = 0;
3916 int funcdef_flag = 0;
3917 enum tree_code innermost_code = ERROR_MARK;
3919 int size_varies = 0;
3920 tree decl_machine_attr = NULL_TREE;
3922 if (decl_context == BITFIELD)
3923 bitfield = 1, decl_context = FIELD;
3925 if (decl_context == FUNCDEF)
3926 funcdef_flag = 1, decl_context = NORMAL;
3928 /* Look inside a declarator for the name being declared
3929 and get it as a string, for an error message. */
3931 register tree decl = declarator;
3935 switch (TREE_CODE (decl))
3940 innermost_code = TREE_CODE (decl);
3941 decl = TREE_OPERAND (decl, 0);
3944 case IDENTIFIER_NODE:
3945 name = IDENTIFIER_POINTER (decl);
3956 /* A function definition's declarator must have the form of
3957 a function declarator. */
3959 if (funcdef_flag && innermost_code != CALL_EXPR)
3962 /* Anything declared one level down from the top level
3963 must be one of the parameters of a function
3964 (because the body is at least two levels down). */
3966 /* If this looks like a function definition, make it one,
3967 even if it occurs where parms are expected.
3968 Then store_parm_decls will reject it and not use it as a parm. */
3969 if (decl_context == NORMAL && !funcdef_flag
3970 && current_binding_level->parm_flag)
3971 decl_context = PARM;
3973 /* Look through the decl specs and record which ones appear.
3974 Some typespecs are defined as built-in typenames.
3975 Others, the ones that are modifiers of other types,
3976 are represented by bits in SPECBITS: set the bits for
3977 the modifiers that appear. Storage class keywords are also in SPECBITS.
3979 If there is a typedef name or a type, store the type in TYPE.
3980 This includes builtin typedefs such as `int'.
3982 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3983 and did not come from a user typedef.
3985 Set LONGLONG if `long' is mentioned twice. */
3987 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3990 register tree id = TREE_VALUE (spec);
3992 if (id == ridpointers[(int) RID_INT])
3994 if (id == ridpointers[(int) RID_CHAR])
3997 if (TREE_CODE (id) == IDENTIFIER_NODE)
3998 for (i = (int) RID_FIRST_MODIFIER; i < (int) RID_MAX; i++)
4000 if (ridpointers[i] == id)
4002 if (i == (int) RID_LONG && specbits & (1 << i))
4005 error ("`long long long' is too long for GCC");
4008 if (pedantic && !flag_isoc99 && ! in_system_header
4010 pedwarn ("ISO C89 does not support `long long'");
4014 else if (specbits & (1 << i))
4015 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
4021 error ("two or more data types in declaration of `%s'", name);
4022 /* Actual typedefs come to us as TYPE_DECL nodes. */
4023 else if (TREE_CODE (id) == TYPE_DECL)
4025 type = TREE_TYPE (id);
4026 decl_machine_attr = DECL_MACHINE_ATTRIBUTES (id);
4029 /* Built-in types come as identifiers. */
4030 else if (TREE_CODE (id) == IDENTIFIER_NODE)
4032 register tree t = lookup_name (id);
4033 if (TREE_TYPE (t) == error_mark_node)
4035 else if (!t || TREE_CODE (t) != TYPE_DECL)
4036 error ("`%s' fails to be a typedef or built in type",
4037 IDENTIFIER_POINTER (id));
4040 type = TREE_TYPE (t);
4044 else if (TREE_CODE (id) != ERROR_MARK)
4051 typedef_type = type;
4053 size_varies = C_TYPE_VARIABLE_SIZE (type);
4055 /* No type at all: default to `int', and set DEFAULTED_INT
4056 because it was not a user-defined typedef. */
4060 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4061 | (1 << (int) RID_SIGNED)
4062 | (1 << (int) RID_UNSIGNED))))
4063 /* Don't warn about typedef foo = bar. */
4064 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
4065 && ! in_system_header)
4067 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
4068 and this is a function, or if -Wimplicit; prefer the former
4069 warning since it is more explicit. */
4070 if ((warn_implicit_int || warn_return_type) && funcdef_flag)
4071 warn_about_return_type = 1;
4072 else if (warn_implicit_int || flag_isoc99)
4073 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
4078 type = integer_type_node;
4081 /* Now process the modifiers that were specified
4082 and check for invalid combinations. */
4084 /* Long double is a special combination. */
4086 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4087 && TYPE_MAIN_VARIANT (type) == double_type_node)
4089 specbits &= ~(1 << (int) RID_LONG);
4090 type = long_double_type_node;
4093 /* Check all other uses of type modifiers. */
4095 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4096 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4100 if ((specbits & 1 << (int) RID_LONG)
4101 && (specbits & 1 << (int) RID_SHORT))
4102 error ("both long and short specified for `%s'", name);
4103 else if (((specbits & 1 << (int) RID_LONG)
4104 || (specbits & 1 << (int) RID_SHORT))
4106 error ("long or short specified with char for `%s'", name);
4107 else if (((specbits & 1 << (int) RID_LONG)
4108 || (specbits & 1 << (int) RID_SHORT))
4109 && TREE_CODE (type) == REAL_TYPE)
4111 static int already = 0;
4113 error ("long or short specified with floating type for `%s'", name);
4114 if (! already && ! pedantic)
4116 error ("the only valid combination is `long double'");
4120 else if ((specbits & 1 << (int) RID_SIGNED)
4121 && (specbits & 1 << (int) RID_UNSIGNED))
4122 error ("both signed and unsigned specified for `%s'", name);
4123 else if (TREE_CODE (type) != INTEGER_TYPE)
4124 error ("long, short, signed or unsigned invalid for `%s'", name);
4128 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4130 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4132 if (flag_pedantic_errors)
4137 /* Discard the type modifiers if they are invalid. */
4140 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4141 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4146 if ((specbits & (1 << (int) RID_COMPLEX))
4147 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4149 error ("complex invalid for `%s'", name);
4150 specbits &= ~(1 << (int) RID_COMPLEX);
4153 /* Decide whether an integer type is signed or not.
4154 Optionally treat bitfields as signed by default. */
4155 if (specbits & 1 << (int) RID_UNSIGNED
4156 /* Traditionally, all bitfields are unsigned. */
4157 || (bitfield && flag_traditional
4158 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4159 || (bitfield && ! flag_signed_bitfields
4160 && (explicit_int || defaulted_int || explicit_char
4161 /* A typedef for plain `int' without `signed'
4162 can be controlled just like plain `int'. */
4163 || ! (typedef_decl != 0
4164 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4165 && TREE_CODE (type) != ENUMERAL_TYPE
4166 && !(specbits & 1 << (int) RID_SIGNED)))
4169 type = long_long_unsigned_type_node;
4170 else if (specbits & 1 << (int) RID_LONG)
4171 type = long_unsigned_type_node;
4172 else if (specbits & 1 << (int) RID_SHORT)
4173 type = short_unsigned_type_node;
4174 else if (type == char_type_node)
4175 type = unsigned_char_type_node;
4176 else if (typedef_decl)
4177 type = unsigned_type (type);
4179 type = unsigned_type_node;
4181 else if ((specbits & 1 << (int) RID_SIGNED)
4182 && type == char_type_node)
4183 type = signed_char_type_node;
4185 type = long_long_integer_type_node;
4186 else if (specbits & 1 << (int) RID_LONG)
4187 type = long_integer_type_node;
4188 else if (specbits & 1 << (int) RID_SHORT)
4189 type = short_integer_type_node;
4191 if (specbits & 1 << (int) RID_COMPLEX)
4193 /* If we just have "complex", it is equivalent to
4194 "complex double", but if any modifiers at all are specified it is
4195 the complex form of TYPE. E.g, "complex short" is
4196 "complex short int". */
4198 if (defaulted_int && ! longlong
4199 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4200 | (1 << (int) RID_SIGNED)
4201 | (1 << (int) RID_UNSIGNED))))
4202 type = complex_double_type_node;
4203 else if (type == integer_type_node)
4204 type = complex_integer_type_node;
4205 else if (type == float_type_node)
4206 type = complex_float_type_node;
4207 else if (type == double_type_node)
4208 type = complex_double_type_node;
4209 else if (type == long_double_type_node)
4210 type = complex_long_double_type_node;
4212 type = build_complex_type (type);
4215 /* Figure out the type qualifiers for the declaration. There are
4216 two ways a declaration can become qualified. One is something
4217 like `const int i' where the `const' is explicit. Another is
4218 something like `typedef const int CI; CI i' where the type of the
4219 declaration contains the `const'. */
4220 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4221 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
4222 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4223 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4224 if (constp > 1 && ! flag_isoc99)
4225 pedwarn ("duplicate `const'");
4226 if (restrictp > 1 && ! flag_isoc99)
4227 pedwarn ("duplicate `restrict'");
4228 if (volatilep > 1 && ! flag_isoc99)
4229 pedwarn ("duplicate `volatile'");
4230 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
4231 type = TYPE_MAIN_VARIANT (type);
4232 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4233 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4234 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4236 /* Warn if two storage classes are given. Default to `auto'. */
4241 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4242 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4243 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4244 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4245 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4247 /* Warn about storage classes that are invalid for certain
4248 kinds of declarations (parameters, typenames, etc.). */
4251 error ("multiple storage classes in declaration of `%s'", name);
4252 else if (funcdef_flag
4254 & ((1 << (int) RID_REGISTER)
4255 | (1 << (int) RID_AUTO)
4256 | (1 << (int) RID_TYPEDEF))))
4258 if (specbits & 1 << (int) RID_AUTO
4259 && (pedantic || current_binding_level == global_binding_level))
4260 pedwarn ("function definition declared `auto'");
4261 if (specbits & 1 << (int) RID_REGISTER)
4262 error ("function definition declared `register'");
4263 if (specbits & 1 << (int) RID_TYPEDEF)
4264 error ("function definition declared `typedef'");
4265 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4266 | (1 << (int) RID_AUTO));
4268 else if (decl_context != NORMAL && nclasses > 0)
4270 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4274 switch (decl_context)
4277 error ("storage class specified for structure field `%s'",
4281 error ("storage class specified for parameter `%s'", name);
4284 error ("storage class specified for typename");
4287 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4288 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4289 | (1 << (int) RID_EXTERN));
4292 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4294 /* `extern' with initialization is invalid if not at top level. */
4295 if (current_binding_level == global_binding_level)
4296 warning ("`%s' initialized and declared `extern'", name);
4298 error ("`%s' has both `extern' and initializer", name);
4300 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4301 && current_binding_level != global_binding_level)
4302 error ("nested function `%s' declared `extern'", name);
4303 else if (current_binding_level == global_binding_level
4304 && specbits & (1 << (int) RID_AUTO))
4305 error ("top-level declaration of `%s' specifies `auto'", name);
4308 /* Now figure out the structure of the declarator proper.
4309 Descend through it, creating more complex types, until we reach
4310 the declared identifier (or NULL_TREE, in an absolute declarator). */
4312 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4314 if (type == error_mark_node)
4316 declarator = TREE_OPERAND (declarator, 0);
4320 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4321 an INDIRECT_REF (for *...),
4322 a CALL_EXPR (for ...(...)),
4323 an identifier (for the name being declared)
4324 or a null pointer (for the place in an absolute declarator
4325 where the name was omitted).
4326 For the last two cases, we have just exited the loop.
4328 At this point, TYPE is the type of elements of an array,
4329 or for a function to return, or for a pointer to point to.
4330 After this sequence of ifs, TYPE is the type of the
4331 array or function or pointer, and DECLARATOR has had its
4332 outermost layer removed. */
4334 if (TREE_CODE (declarator) == ARRAY_REF)
4336 register tree itype = NULL_TREE;
4337 register tree size = TREE_OPERAND (declarator, 1);
4338 /* The index is a signed object `sizetype' bits wide. */
4339 tree index_type = signed_type (sizetype);
4341 declarator = TREE_OPERAND (declarator, 0);
4343 /* Check for some types that there cannot be arrays of. */
4345 if (VOID_TYPE_P (type))
4347 error ("declaration of `%s' as array of voids", name);
4348 type = error_mark_node;
4351 if (TREE_CODE (type) == FUNCTION_TYPE)
4353 error ("declaration of `%s' as array of functions", name);
4354 type = error_mark_node;
4357 if (size == error_mark_node)
4358 type = error_mark_node;
4360 if (type == error_mark_node)
4363 /* If size was specified, set ITYPE to a range-type for that size.
4364 Otherwise, ITYPE remains null. finish_decl may figure it out
4365 from an initial value. */
4369 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4370 STRIP_TYPE_NOPS (size);
4372 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
4373 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
4375 error ("size of array `%s' has non-integer type", name);
4376 size = integer_one_node;
4379 if (pedantic && integer_zerop (size))
4380 pedwarn ("ISO C forbids zero-size array `%s'", name);
4382 if (TREE_CODE (size) == INTEGER_CST)
4384 constant_expression_warning (size);
4385 if (tree_int_cst_sgn (size) < 0)
4387 error ("size of array `%s' is negative", name);
4388 size = integer_one_node;
4393 /* Make sure the array size remains visibly nonconstant
4394 even if it is (eg) a const variable with known value. */
4399 if (TREE_CONSTANT (size))
4400 pedwarn ("ISO C89 forbids array `%s' whose size can't be evaluated",
4403 pedwarn ("ISO C89 forbids variable-size array `%s'",
4408 /* Convert size to index_type, so that if it is a variable
4409 the computations will be done in the proper mode. */
4410 itype = fold (build (MINUS_EXPR, index_type,
4411 convert (index_type, size),
4412 convert (index_type, size_one_node)));
4414 /* If that overflowed, the array is too big.
4415 ??? While a size of INT_MAX+1 technically shouldn't cause
4416 an overflow (because we subtract 1), the overflow is recorded
4417 during the conversion to index_type, before the subtraction.
4418 Handling this case seems like an unnecessary complication. */
4419 if (TREE_OVERFLOW (itype))
4421 error ("size of array `%s' is too large", name);
4422 type = error_mark_node;
4427 itype = variable_size (itype);
4428 itype = build_index_type (itype);
4432 /* This had bad results for pointers to arrays, as in
4433 union incomplete (*foo)[4]; */
4434 /* Complain about arrays of incomplete types, except in typedefs. */
4436 if (!COMPLETE_TYPE_P (type)
4437 /* Avoid multiple warnings for nested array types. */
4438 && TREE_CODE (type) != ARRAY_TYPE
4439 && !(specbits & (1 << (int) RID_TYPEDEF))
4440 && !C_TYPE_BEING_DEFINED (type))
4441 warning ("array type has incomplete element type");
4445 /* We shouldn't have a function type here at all!
4446 Functions aren't allowed as array elements. */
4447 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4448 && (constp || volatilep))
4449 pedwarn ("ANSI C forbids const or volatile function types");
4452 /* Build the array type itself, then merge any constancy or
4453 volatility into the target type. We must do it in this order
4454 to ensure that the TYPE_MAIN_VARIANT field of the array type
4455 is set correctly. */
4457 type = build_array_type (type, itype);
4459 type = c_build_qualified_type (type, type_quals);
4462 /* Don't clear these; leave them set so that the array type
4463 or the variable is itself const or volatile. */
4464 type_quals = TYPE_UNQUALIFIED;
4468 C_TYPE_VARIABLE_SIZE (type) = 1;
4470 else if (TREE_CODE (declarator) == CALL_EXPR)
4474 /* Declaring a function type.
4475 Make sure we have a valid type for the function to return. */
4476 if (type == error_mark_node)
4481 /* Warn about some types functions can't return. */
4483 if (TREE_CODE (type) == FUNCTION_TYPE)
4485 error ("`%s' declared as function returning a function", name);
4486 type = integer_type_node;
4488 if (TREE_CODE (type) == ARRAY_TYPE)
4490 error ("`%s' declared as function returning an array", name);
4491 type = integer_type_node;
4494 #ifndef TRADITIONAL_RETURN_FLOAT
4495 /* Traditionally, declaring return type float means double. */
4497 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4498 type = double_type_node;
4499 #endif /* TRADITIONAL_RETURN_FLOAT */
4501 /* Construct the function type and go to the next
4502 inner layer of declarator. */
4504 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4506 /* Say it's a definition
4507 only for the CALL_EXPR
4508 closest to the identifier. */
4509 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4510 /* Type qualifiers before the return type of the function
4511 qualify the return type, not the function type. */
4513 type = c_build_qualified_type (type, type_quals);
4514 type_quals = TYPE_UNQUALIFIED;
4516 type = build_function_type (type, arg_types);
4517 declarator = TREE_OPERAND (declarator, 0);
4519 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4520 the formal parameter list of this FUNCTION_TYPE to point to
4521 the FUNCTION_TYPE node itself. */
4526 for (link = last_function_parm_tags;
4528 link = TREE_CHAIN (link))
4529 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4532 else if (TREE_CODE (declarator) == INDIRECT_REF)
4534 /* Merge any constancy or volatility into the target type
4537 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4539 pedwarn ("ISO C forbids qualified function types");
4541 type = c_build_qualified_type (type, type_quals);
4542 type_quals = TYPE_UNQUALIFIED;
4545 type = build_pointer_type (type);
4547 /* Process a list of type modifier keywords
4548 (such as const or volatile) that were given inside the `*'. */
4550 if (TREE_TYPE (declarator))
4552 register tree typemodlist;
4558 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4559 typemodlist = TREE_CHAIN (typemodlist))
4561 tree qualifier = TREE_VALUE (typemodlist);
4563 if (qualifier == ridpointers[(int) RID_CONST])
4565 else if (qualifier == ridpointers[(int) RID_VOLATILE])
4567 else if (qualifier == ridpointers[(int) RID_RESTRICT])
4572 error ("invalid type modifier within pointer declarator");
4575 if (constp > 1 && ! flag_isoc99)
4576 pedwarn ("duplicate `const'");
4577 if (volatilep > 1 && ! flag_isoc99)
4578 pedwarn ("duplicate `volatile'");
4579 if (restrictp > 1 && ! flag_isoc99)
4580 pedwarn ("duplicate `restrict'");
4582 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4583 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4584 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4587 declarator = TREE_OPERAND (declarator, 0);
4594 /* Now TYPE has the actual type. */
4596 /* Did array size calculations overflow? */
4598 if (TREE_CODE (type) == ARRAY_TYPE
4599 && COMPLETE_TYPE_P (type)
4600 && TREE_OVERFLOW (TYPE_SIZE (type)))
4601 error ("size of array `%s' is too large", name);
4603 /* If this is declaring a typedef name, return a TYPE_DECL. */
4605 if (specbits & (1 << (int) RID_TYPEDEF))
4608 /* Note that the grammar rejects storage classes
4609 in typenames, fields or parameters */
4610 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4612 pedwarn ("ISO C forbids qualified function types");
4614 type = c_build_qualified_type (type, type_quals);
4615 decl = build_decl (TYPE_DECL, declarator, type);
4616 if ((specbits & (1 << (int) RID_SIGNED))
4617 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4618 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4622 /* Detect the case of an array type of unspecified size
4623 which came, as such, direct from a typedef name.
4624 We must copy the type, so that each identifier gets
4625 a distinct type, so that each identifier's size can be
4626 controlled separately by its own initializer. */
4628 if (type != 0 && typedef_type != 0
4629 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type)
4630 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0)
4632 type = build_array_type (TREE_TYPE (type), 0);
4634 C_TYPE_VARIABLE_SIZE (type) = 1;
4637 /* If this is a type name (such as, in a cast or sizeof),
4638 compute the type and return it now. */
4640 if (decl_context == TYPENAME)
4642 /* Note that the grammar rejects storage classes
4643 in typenames, fields or parameters */
4644 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4646 pedwarn ("ISO C forbids const or volatile function types");
4648 type = c_build_qualified_type (type, type_quals);
4652 /* Aside from typedefs and type names (handle above),
4653 `void' at top level (not within pointer)
4654 is allowed only in public variables.
4655 We don't complain about parms either, but that is because
4656 a better error message can be made later. */
4658 if (VOID_TYPE_P (type) && decl_context != PARM
4659 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4660 && ((specbits & (1 << (int) RID_EXTERN))
4661 || (current_binding_level == global_binding_level
4663 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4665 error ("variable or field `%s' declared void", name);
4666 type = integer_type_node;
4669 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4670 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4675 if (decl_context == PARM)
4677 tree type_as_written = type;
4680 /* A parameter declared as an array of T is really a pointer to T.
4681 One declared as a function is really a pointer to a function. */
4683 if (TREE_CODE (type) == ARRAY_TYPE)
4685 /* Transfer const-ness of array into that of type pointed to. */
4686 type = TREE_TYPE (type);
4688 type = c_build_qualified_type (type, type_quals);
4689 type = build_pointer_type (type);
4690 type_quals = TYPE_UNQUALIFIED;
4693 else if (TREE_CODE (type) == FUNCTION_TYPE)
4695 if (pedantic && type_quals)
4696 pedwarn ("ISO C forbids qualified function types");
4698 type = c_build_qualified_type (type, type_quals);
4699 type = build_pointer_type (type);
4700 type_quals = TYPE_UNQUALIFIED;
4703 decl = build_decl (PARM_DECL, declarator, type);
4705 C_DECL_VARIABLE_SIZE (decl) = 1;
4707 /* Compute the type actually passed in the parmlist,
4708 for the case where there is no prototype.
4709 (For example, shorts and chars are passed as ints.)
4710 When there is a prototype, this is overridden later. */
4712 if (type == error_mark_node)
4713 promoted_type = type;
4716 promoted_type = simple_type_promotes_to (type);
4717 if (! promoted_type)
4718 promoted_type = type;
4721 DECL_ARG_TYPE (decl) = promoted_type;
4722 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4724 else if (decl_context == FIELD)
4726 /* Structure field. It may not be a function. */
4728 if (TREE_CODE (type) == FUNCTION_TYPE)
4730 error ("field `%s' declared as a function", name);
4731 type = build_pointer_type (type);
4733 else if (TREE_CODE (type) != ERROR_MARK
4734 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4736 error ("field `%s' has incomplete type", name);
4737 type = error_mark_node;
4739 /* Move type qualifiers down to element of an array. */
4740 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4742 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4744 TYPE_DOMAIN (type));
4746 /* Leave the field const or volatile as well. */
4747 type_quals = TYPE_UNQUALIFIED;
4750 decl = build_decl (FIELD_DECL, declarator, type);
4751 DECL_NONADDRESSABLE_P (decl) = bitfield;
4754 C_DECL_VARIABLE_SIZE (decl) = 1;
4756 else if (TREE_CODE (type) == FUNCTION_TYPE)
4758 /* Every function declaration is "external"
4759 except for those which are inside a function body
4760 in which `auto' is used.
4761 That is a case not specified by ANSI C,
4762 and we use it for forward declarations for nested functions. */
4763 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4764 || current_binding_level == global_binding_level);
4766 if (specbits & (1 << (int) RID_AUTO)
4767 && (pedantic || current_binding_level == global_binding_level))
4768 pedwarn ("invalid storage class for function `%s'", name);
4769 if (specbits & (1 << (int) RID_REGISTER))
4770 error ("invalid storage class for function `%s'", name);
4771 /* Function declaration not at top level.
4772 Storage classes other than `extern' are not allowed
4773 and `extern' makes no difference. */
4774 if (current_binding_level != global_binding_level
4775 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4777 pedwarn ("invalid storage class for function `%s'", name);
4779 decl = build_decl (FUNCTION_DECL, declarator, type);
4780 decl = build_decl_attribute_variant (decl, decl_machine_attr);
4782 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4783 pedwarn ("ISO C forbids qualified function types");
4786 && VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl)))
4787 && TYPE_QUALS (TREE_TYPE (TREE_TYPE (decl)))
4788 && ! DECL_IN_SYSTEM_HEADER (decl))
4789 pedwarn ("ISO C forbids qualified void function return type");
4791 /* GNU C interprets a `volatile void' return type to indicate
4792 that the function does not return. */
4793 if ((type_quals & TYPE_QUAL_VOLATILE)
4794 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4795 warning ("`noreturn' function returns non-void value");
4798 DECL_EXTERNAL (decl) = 1;
4799 /* Record absence of global scope for `static' or `auto'. */
4801 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4803 /* Record presence of `inline', if it is reasonable. */
4806 if (MAIN_NAME_P (declarator))
4807 warning ("cannot inline function `main'");
4809 /* Assume that otherwise the function can be inlined. */
4810 DECL_INLINE (decl) = 1;
4812 if (specbits & (1 << (int) RID_EXTERN))
4813 current_extern_inline = 1;
4818 /* It's a variable. */
4819 /* An uninitialized decl with `extern' is a reference. */
4820 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4822 /* Move type qualifiers down to element of an array. */
4823 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4825 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4827 TYPE_DOMAIN (type));
4828 #if 0 /* Leave the variable const or volatile as well. */
4829 type_quals = TYPE_UNQUALIFIED;
4833 decl = build_decl (VAR_DECL, declarator, type);
4835 C_DECL_VARIABLE_SIZE (decl) = 1;
4838 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4840 DECL_EXTERNAL (decl) = extern_ref;
4841 /* At top level, the presence of a `static' or `register' storage
4842 class specifier, or the absence of all storage class specifiers
4843 makes this declaration a definition (perhaps tentative). Also,
4844 the absence of both `static' and `register' makes it public. */
4845 if (current_binding_level == global_binding_level)
4849 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
4850 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
4852 /* Not at top level, only `static' makes a static definition. */
4855 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4856 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
4860 /* Record `register' declaration for warnings on &
4861 and in case doing stupid register allocation. */
4863 if (specbits & (1 << (int) RID_REGISTER))
4864 DECL_REGISTER (decl) = 1;
4866 /* Record constancy and volatility. */
4867 c_apply_type_quals_to_decl (type_quals, decl);
4869 /* If a type has volatile components, it should be stored in memory.
4870 Otherwise, the fact that those components are volatile
4871 will be ignored, and would even crash the compiler. */
4872 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4873 mark_addressable (decl);
4879 /* Decode the parameter-list info for a function type or function definition.
4880 The argument is the value returned by `get_parm_info' (or made in parse.y
4881 if there is an identifier list instead of a parameter decl list).
4882 These two functions are separate because when a function returns
4883 or receives functions then each is called multiple times but the order
4884 of calls is different. The last call to `grokparms' is always the one
4885 that contains the formal parameter names of a function definition.
4887 Store in `last_function_parms' a chain of the decls of parms.
4888 Also store in `last_function_parm_tags' a chain of the struct, union,
4889 and enum tags declared among the parms.
4891 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4893 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4894 a mere declaration. A nonempty identifier-list gets an error message
4895 when FUNCDEF_FLAG is zero. */
4898 grokparms (parms_info, funcdef_flag)
4902 tree first_parm = TREE_CHAIN (parms_info);
4904 last_function_parms = TREE_PURPOSE (parms_info);
4905 last_function_parm_tags = TREE_VALUE (parms_info);
4907 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
4908 && !in_system_header)
4909 warning ("function declaration isn't a prototype");
4912 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
4915 pedwarn ("parameter names (without types) in function declaration");
4917 last_function_parms = first_parm;
4924 /* We no longer test FUNCDEF_FLAG.
4925 If the arg types are incomplete in a declaration,
4926 they must include undefined tags.
4927 These tags can never be defined in the scope of the declaration,
4928 so the types can never be completed,
4929 and no call can be compiled successfully. */
4931 /* In a fcn definition, arg types must be complete. */
4934 for (parm = last_function_parms, typelt = first_parm;
4936 parm = TREE_CHAIN (parm))
4937 /* Skip over any enumeration constants declared here. */
4938 if (TREE_CODE (parm) == PARM_DECL)
4940 /* Barf if the parameter itself has an incomplete type. */
4941 tree type = TREE_VALUE (typelt);
4942 if (!COMPLETE_TYPE_P (type))
4944 if (funcdef_flag && DECL_NAME (parm) != 0)
4945 error ("parameter `%s' has incomplete type",
4946 IDENTIFIER_POINTER (DECL_NAME (parm)));
4948 warning ("parameter has incomplete type");
4951 TREE_VALUE (typelt) = error_mark_node;
4952 TREE_TYPE (parm) = error_mark_node;
4956 /* This has been replaced by parm_tags_warning, which
4957 uses a more accurate criterion for what to warn
4961 /* Now warn if is a pointer to an incomplete type. */
4962 while (TREE_CODE (type) == POINTER_TYPE
4963 || TREE_CODE (type) == REFERENCE_TYPE)
4964 type = TREE_TYPE (type);
4965 type = TYPE_MAIN_VARIANT (type);
4966 if (!COMPLETE_TYPE_P (type))
4968 if (DECL_NAME (parm) != 0)
4969 warning ("parameter `%s' points to incomplete type",
4970 IDENTIFIER_POINTER (DECL_NAME (parm)));
4972 warning ("parameter points to incomplete type");
4976 typelt = TREE_CHAIN (typelt);
4983 /* Return a tree_list node with info on a parameter list just parsed.
4984 The TREE_PURPOSE is a chain of decls of those parms.
4985 The TREE_VALUE is a list of structure, union and enum tags defined.
4986 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
4987 This tree_list node is later fed to `grokparms'.
4989 VOID_AT_END nonzero means append `void' to the end of the type-list.
4990 Zero means the parmlist ended with an ellipsis so don't append `void'. */
4993 get_parm_info (void_at_end)
4996 register tree decl, t;
4997 register tree types = 0;
4999 tree tags = gettags ();
5000 tree parms = getdecls ();
5002 tree order = current_binding_level->parm_order;
5004 /* Just `void' (and no ellipsis) is special. There are really no parms.
5005 But if the `void' is qualified (by `const' or `volatile') or has a
5006 storage class specifier (`register'), then the behavior is undefined;
5007 by not counting it as the special case of `void' we will cause an
5008 error later. Typedefs for `void' are OK (see DR#157). */
5009 if (void_at_end && parms != 0
5010 && TREE_CHAIN (parms) == 0
5011 && VOID_TYPE_P (TREE_TYPE (parms))
5012 && ! TREE_THIS_VOLATILE (parms)
5013 && ! TREE_READONLY (parms)
5014 && ! DECL_REGISTER (parms)
5015 && DECL_NAME (parms) == 0)
5018 storedecls (NULL_TREE);
5019 return tree_cons (NULL_TREE, NULL_TREE,
5020 tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5023 /* Extract enumerator values and other non-parms declared with the parms.
5024 Likewise any forward parm decls that didn't have real parm decls. */
5025 for (decl = parms; decl;)
5027 tree next = TREE_CHAIN (decl);
5029 if (TREE_CODE (decl) != PARM_DECL)
5031 TREE_CHAIN (decl) = new_parms;
5034 else if (TREE_ASM_WRITTEN (decl))
5036 error_with_decl (decl,
5037 "parameter `%s' has just a forward declaration");
5038 TREE_CHAIN (decl) = new_parms;
5044 /* Put the parm decls back in the order they were in in the parm list. */
5045 for (t = order; t; t = TREE_CHAIN (t))
5048 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5050 TREE_CHAIN (TREE_VALUE (t)) = 0;
5053 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5056 /* Store the parmlist in the binding level since the old one
5057 is no longer a valid list. (We have changed the chain pointers.) */
5058 storedecls (new_parms);
5060 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5061 /* There may also be declarations for enumerators if an enumeration
5062 type is declared among the parms. Ignore them here. */
5063 if (TREE_CODE (decl) == PARM_DECL)
5065 /* Since there is a prototype,
5066 args are passed in their declared types. */
5067 tree type = TREE_TYPE (decl);
5068 DECL_ARG_TYPE (decl) = type;
5069 if (PROMOTE_PROTOTYPES
5070 && (TREE_CODE (type) == INTEGER_TYPE
5071 || TREE_CODE (type) == ENUMERAL_TYPE)
5072 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5073 DECL_ARG_TYPE (decl) = integer_type_node;
5075 types = tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5076 if (VOID_TYPE_P (TREE_VALUE (types)) && ! erred
5077 && DECL_NAME (decl) == 0)
5079 error ("`void' in parameter list must be the entire list");
5085 return tree_cons (new_parms, tags,
5086 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
5088 return tree_cons (new_parms, tags, nreverse (types));
5091 /* At end of parameter list, warn about any struct, union or enum tags
5092 defined within. Do so because these types cannot ever become complete. */
5095 parmlist_tags_warning ()
5100 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5102 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5103 /* An anonymous union parm type is meaningful as a GNU extension.
5104 So don't warn for that. */
5105 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5107 if (TREE_PURPOSE (elt) != 0)
5108 warning ("`%s %s' declared inside parameter list",
5109 (code == RECORD_TYPE ? "struct"
5110 : code == UNION_TYPE ? "union"
5112 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5115 /* For translation these need to be seperate warnings */
5116 if (code == RECORD_TYPE)
5117 warning ("anonymous struct declared inside parameter list");
5118 else if (code == UNION_TYPE)
5119 warning ("anonymous union declared inside parameter list");
5121 warning ("anonymous enum declared inside parameter list");
5125 warning ("its scope is only this definition or declaration, which is probably not what you want.");
5131 /* Get the struct, enum or union (CODE says which) with tag NAME.
5132 Define the tag as a forward-reference if it is not defined. */
5135 xref_tag (code, name)
5136 enum tree_code code;
5139 /* If a cross reference is requested, look up the type
5140 already defined for this tag and return it. */
5142 register tree ref = lookup_tag (code, name, current_binding_level, 0);
5143 /* Even if this is the wrong type of tag, return what we found.
5144 There will be an error message anyway, from pending_xref_error.
5145 If we create an empty xref just for an invalid use of the type,
5146 the main result is to create lots of superfluous error messages. */
5150 /* If no such tag is yet defined, create a forward-reference node
5151 and record it as the "definition".
5152 When a real declaration of this type is found,
5153 the forward-reference will be altered into a real type. */
5155 ref = make_node (code);
5156 if (code == ENUMERAL_TYPE)
5158 /* (In ANSI, Enums can be referred to only if already defined.) */
5160 pedwarn ("ISO C forbids forward references to `enum' types");
5161 /* Give the type a default layout like unsigned int
5162 to avoid crashing if it does not get defined. */
5163 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5164 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5165 TYPE_USER_ALIGN (ref) = 0;
5166 TREE_UNSIGNED (ref) = 1;
5167 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5168 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5169 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5172 pushtag (name, ref);
5177 /* Make sure that the tag NAME is defined *in the current binding level*
5178 at least as a forward reference.
5179 CODE says which kind of tag NAME ought to be. */
5182 start_struct (code, name)
5183 enum tree_code code;
5186 /* If there is already a tag defined at this binding level
5187 (as a forward reference), just return it. */
5189 register tree ref = 0;
5192 ref = lookup_tag (code, name, current_binding_level, 1);
5193 if (ref && TREE_CODE (ref) == code)
5195 C_TYPE_BEING_DEFINED (ref) = 1;
5196 TYPE_PACKED (ref) = flag_pack_struct;
5197 if (TYPE_FIELDS (ref))
5198 error ("redefinition of `%s %s'",
5199 code == UNION_TYPE ? "union" : "struct",
5200 IDENTIFIER_POINTER (name));
5205 /* Otherwise create a forward-reference just so the tag is in scope. */
5207 ref = make_node (code);
5208 pushtag (name, ref);
5209 C_TYPE_BEING_DEFINED (ref) = 1;
5210 TYPE_PACKED (ref) = flag_pack_struct;
5214 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5215 of a structure component, returning a FIELD_DECL node.
5216 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5218 This is done during the parsing of the struct declaration.
5219 The FIELD_DECL nodes are chained together and the lot of them
5220 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5223 grokfield (filename, line, declarator, declspecs, width)
5224 const char *filename ATTRIBUTE_UNUSED;
5225 int line ATTRIBUTE_UNUSED;
5226 tree declarator, declspecs, width;
5230 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5232 finish_decl (value, NULL_TREE, NULL_TREE);
5233 DECL_INITIAL (value) = width;
5235 maybe_objc_check_decl (value);
5239 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5240 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5241 ATTRIBUTES are attributes to be applied to the structure. */
5244 finish_struct (t, fieldlist, attributes)
5250 int toplevel = global_binding_level == current_binding_level;
5252 /* If this type was previously laid out as a forward reference,
5253 make sure we lay it out again. */
5257 decl_attributes (t, attributes, NULL_TREE);
5259 /* Nameless union parm types are useful as GCC extension. */
5260 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5261 /* Otherwise, warn about any struct or union def. in parmlist. */
5262 if (in_parm_level_p ())
5265 pedwarn ("%s defined inside parms",
5266 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5267 else if (! flag_traditional)
5268 warning ("%s defined inside parms",
5269 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5274 for (x = fieldlist; x; x = TREE_CHAIN (x))
5275 if (DECL_NAME (x) != 0)
5279 pedwarn ("%s has no %s",
5280 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
5281 fieldlist ? _("named members") : _("members"));
5284 /* Install struct as DECL_CONTEXT of each field decl.
5285 Also process specified field sizes,m which is found in the DECL_INITIAL.
5286 Store 0 there, except for ": 0" fields (so we can find them
5287 and delete them, below). */
5289 for (x = fieldlist; x; x = TREE_CHAIN (x))
5291 DECL_CONTEXT (x) = t;
5292 DECL_PACKED (x) |= TYPE_PACKED (t);
5294 /* If any field is const, the structure type is pseudo-const. */
5295 if (TREE_READONLY (x))
5296 C_TYPE_FIELDS_READONLY (t) = 1;
5299 /* A field that is pseudo-const makes the structure likewise. */
5300 tree t1 = TREE_TYPE (x);
5301 while (TREE_CODE (t1) == ARRAY_TYPE)
5302 t1 = TREE_TYPE (t1);
5303 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5304 && C_TYPE_FIELDS_READONLY (t1))
5305 C_TYPE_FIELDS_READONLY (t) = 1;
5308 /* Any field that is volatile means variables of this type must be
5309 treated in some ways as volatile. */
5310 if (TREE_THIS_VOLATILE (x))
5311 C_TYPE_FIELDS_VOLATILE (t) = 1;
5313 /* Any field of nominal variable size implies structure is too. */
5314 if (C_DECL_VARIABLE_SIZE (x))
5315 C_TYPE_VARIABLE_SIZE (t) = 1;
5317 /* Detect invalid nested redefinition. */
5318 if (TREE_TYPE (x) == t)
5319 error ("nested redefinition of `%s'",
5320 IDENTIFIER_POINTER (TYPE_NAME (t)));
5322 /* Detect invalid bit-field size. */
5323 if (DECL_INITIAL (x))
5324 STRIP_NOPS (DECL_INITIAL (x));
5325 if (DECL_INITIAL (x))
5327 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5328 constant_expression_warning (DECL_INITIAL (x));
5332 "bit-field `%s' width not an integer constant");
5333 DECL_INITIAL (x) = NULL;
5337 /* Detect invalid bit-field type. */
5338 if (DECL_INITIAL (x)
5339 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5340 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5342 error_with_decl (x, "bit-field `%s' has invalid type");
5343 DECL_INITIAL (x) = NULL;
5346 if (DECL_INITIAL (x) && pedantic
5347 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5348 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5349 /* Accept an enum that's equivalent to int or unsigned int. */
5350 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5351 && (TYPE_PRECISION (TREE_TYPE (x))
5352 == TYPE_PRECISION (integer_type_node))))
5353 pedwarn_with_decl (x, "bit-field `%s' type invalid in ISO C");
5355 /* Detect and ignore out of range field width and process valid
5357 if (DECL_INITIAL (x))
5359 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5360 error_with_decl (x, "negative width in bit-field `%s'");
5361 else if (0 < compare_tree_int (DECL_INITIAL (x),
5362 TYPE_PRECISION (TREE_TYPE (x))))
5363 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5364 else if (integer_zerop (DECL_INITIAL (x)) && DECL_NAME (x) != 0)
5365 error_with_decl (x, "zero width for bit-field `%s'");
5368 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
5369 unsigned HOST_WIDE_INT width
5370 = TREE_INT_CST_LOW (DECL_INITIAL (x));
5372 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5373 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5374 TREE_UNSIGNED (TREE_TYPE (x)))
5376 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5377 TREE_UNSIGNED (TREE_TYPE (x))))))
5378 warning_with_decl (x,
5379 "`%s' is narrower than values of its type");
5381 DECL_SIZE (x) = bitsize_int (width);
5382 DECL_BIT_FIELD (x) = DECL_C_BIT_FIELD (x) = 1;
5386 /* field size 0 => force desired amount of alignment. */
5387 #ifdef EMPTY_FIELD_BOUNDARY
5388 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5390 #ifdef PCC_BITFIELD_TYPE_MATTERS
5391 if (PCC_BITFIELD_TYPE_MATTERS)
5393 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5394 TYPE_ALIGN (TREE_TYPE (x)));
5395 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5402 else if (TREE_TYPE (x) != error_mark_node)
5404 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5405 : TYPE_ALIGN (TREE_TYPE (x)));
5407 /* Non-bit-fields are aligned for their type, except packed
5408 fields which require only BITS_PER_UNIT alignment. */
5409 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5410 if (! DECL_PACKED (x))
5411 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5414 DECL_INITIAL (x) = 0;
5417 /* Delete all duplicate fields from the fieldlist */
5418 for (x = fieldlist; x && TREE_CHAIN (x);)
5419 /* Anonymous fields aren't duplicates. */
5420 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5424 register tree y = fieldlist;
5428 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5434 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5436 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5437 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5443 /* Now we have the nearly final fieldlist. Record it,
5444 then lay out the structure or union (including the fields). */
5446 TYPE_FIELDS (t) = fieldlist;
5450 /* Delete all zero-width bit-fields from the fieldlist */
5452 tree *fieldlistp = &fieldlist;
5454 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5455 *fieldlistp = TREE_CHAIN (*fieldlistp);
5457 fieldlistp = &TREE_CHAIN (*fieldlistp);
5460 /* Now we have the truly final field list.
5461 Store it in this type and in the variants. */
5463 TYPE_FIELDS (t) = fieldlist;
5465 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5467 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5468 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5469 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5470 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5473 /* If this was supposed to be a transparent union, but we can't
5474 make it one, warn and turn off the flag. */
5475 if (TREE_CODE (t) == UNION_TYPE
5476 && TYPE_TRANSPARENT_UNION (t)
5477 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5479 TYPE_TRANSPARENT_UNION (t) = 0;
5480 warning ("union cannot be made transparent");
5483 /* If this structure or union completes the type of any previous
5484 variable declaration, lay it out and output its rtl. */
5486 if (current_binding_level->n_incomplete != 0)
5489 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5491 if (TREE_TYPE (decl) == t
5492 && TREE_CODE (decl) != TYPE_DECL)
5494 layout_decl (decl, 0);
5495 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5496 maybe_objc_check_decl (decl);
5497 rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0);
5500 --current_binding_level->n_incomplete;
5502 else if (!COMPLETE_TYPE_P (TREE_TYPE (decl))
5503 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5505 tree element = TREE_TYPE (decl);
5506 while (TREE_CODE (element) == ARRAY_TYPE)
5507 element = TREE_TYPE (element);
5509 layout_array_type (TREE_TYPE (decl));
5514 /* Finish debugging output for this type. */
5515 rest_of_type_compilation (t, toplevel);
5520 /* Lay out the type T, and its element type, and so on. */
5523 layout_array_type (t)
5526 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5527 layout_array_type (TREE_TYPE (t));
5531 /* Begin compiling the definition of an enumeration type.
5532 NAME is its name (or null if anonymous).
5533 Returns the type object, as yet incomplete.
5534 Also records info about it so that build_enumerator
5535 may be used to declare the individual values as they are read. */
5541 register tree enumtype = 0;
5543 /* If this is the real definition for a previous forward reference,
5544 fill in the contents in the same object that used to be the
5545 forward reference. */
5548 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5550 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5552 enumtype = make_node (ENUMERAL_TYPE);
5553 pushtag (name, enumtype);
5556 C_TYPE_BEING_DEFINED (enumtype) = 1;
5558 if (TYPE_VALUES (enumtype) != 0)
5560 /* This enum is a named one that has been declared already. */
5561 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5563 /* Completely replace its old definition.
5564 The old enumerators remain defined, however. */
5565 TYPE_VALUES (enumtype) = 0;
5568 enum_next_value = integer_zero_node;
5571 if (flag_short_enums)
5572 TYPE_PACKED (enumtype) = 1;
5577 /* After processing and defining all the values of an enumeration type,
5578 install their decls in the enumeration type and finish it off.
5579 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5580 and ATTRIBUTES are the specified attributes.
5581 Returns ENUMTYPE. */
5584 finish_enum (enumtype, values, attributes)
5589 register tree pair, tem;
5590 tree minnode = 0, maxnode = 0, enum_value_type;
5591 int precision, unsign;
5592 int toplevel = (global_binding_level == current_binding_level);
5594 if (in_parm_level_p ())
5595 warning ("enum defined inside parms");
5597 decl_attributes (enumtype, attributes, NULL_TREE);
5599 /* Calculate the maximum value of any enumerator in this type. */
5601 if (values == error_mark_node)
5602 minnode = maxnode = integer_zero_node;
5605 minnode = maxnode = TREE_VALUE (values);
5606 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5608 tree value = TREE_VALUE (pair);
5609 if (tree_int_cst_lt (maxnode, value))
5611 if (tree_int_cst_lt (value, minnode))
5616 /* Construct the final type of this enumeration. It is the same
5617 as one of the integral types - the narrowest one that fits, except
5618 that normally we only go as narrow as int - and signed iff any of
5619 the values are negative. */
5620 unsign = (tree_int_cst_sgn (minnode) >= 0);
5621 precision = MAX (min_precision (minnode, unsign),
5622 min_precision (maxnode, unsign));
5623 if (!TYPE_PACKED (enumtype))
5624 precision = MAX (precision, TYPE_PRECISION (integer_type_node));
5625 if (type_for_size (precision, unsign) == 0)
5627 warning ("enumeration values exceed range of largest integer");
5628 precision = TYPE_PRECISION (long_long_integer_type_node);
5631 if (precision == TYPE_PRECISION (integer_type_node))
5632 enum_value_type = type_for_size (precision, 0);
5634 enum_value_type = enumtype;
5636 TYPE_MIN_VALUE (enumtype) = minnode;
5637 TYPE_MAX_VALUE (enumtype) = maxnode;
5638 TYPE_PRECISION (enumtype) = precision;
5639 TREE_UNSIGNED (enumtype) = unsign;
5640 TYPE_SIZE (enumtype) = 0;
5641 layout_type (enumtype);
5643 if (values != error_mark_node)
5645 /* Change the type of the enumerators to be the enum type. We
5646 need to do this irrespective of the size of the enum, for
5647 proper type checking. Replace the DECL_INITIALs of the
5648 enumerators, and the value slots of the list, with copies
5649 that have the enum type; they cannot be modified in place
5650 because they may be shared (e.g. integer_zero_node) Finally,
5651 change the purpose slots to point to the names of the decls. */
5652 for (pair = values; pair; pair = TREE_CHAIN (pair))
5654 tree enu = TREE_PURPOSE (pair);
5656 TREE_TYPE (enu) = enumtype;
5657 DECL_SIZE (enu) = TYPE_SIZE (enumtype);
5658 DECL_SIZE_UNIT (enu) = TYPE_SIZE_UNIT (enumtype);
5659 DECL_ALIGN (enu) = TYPE_ALIGN (enumtype);
5660 DECL_USER_ALIGN (enu) = TYPE_USER_ALIGN (enumtype);
5661 DECL_MODE (enu) = TYPE_MODE (enumtype);
5663 /* The ISO C Standard mandates enumerators to have type int,
5664 even though the underlying type of an enum type is
5665 unspecified. Here we convert any enumerators that fit in
5666 an int to type int, to avoid promotions to unsigned types
5667 when comparing integers with enumerators that fit in the
5668 int range. When -pedantic is given, build_enumerator()
5669 would have already taken care of those that don't fit. */
5670 if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
5671 DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
5673 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5675 TREE_PURPOSE (pair) = DECL_NAME (enu);
5676 TREE_VALUE (pair) = DECL_INITIAL (enu);
5679 TYPE_VALUES (enumtype) = values;
5682 /* Fix up all variant types of this enum type. */
5683 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5685 if (tem == enumtype)
5687 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5688 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5689 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5690 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5691 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5692 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5693 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5694 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5695 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5696 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5699 /* Finish debugging output for this type. */
5700 rest_of_type_compilation (enumtype, toplevel);
5705 /* Build and install a CONST_DECL for one value of the
5706 current enumeration type (one that was begun with start_enum).
5707 Return a tree-list containing the CONST_DECL and its value.
5708 Assignment of sequential values by default is handled here. */
5711 build_enumerator (name, value)
5714 register tree decl, type;
5716 /* Validate and default VALUE. */
5718 /* Remove no-op casts from the value. */
5720 STRIP_TYPE_NOPS (value);
5724 if (TREE_CODE (value) == INTEGER_CST)
5726 value = default_conversion (value);
5727 constant_expression_warning (value);
5731 error ("enumerator value for `%s' not integer constant",
5732 IDENTIFIER_POINTER (name));
5737 /* Default based on previous value. */
5738 /* It should no longer be possible to have NON_LVALUE_EXPR
5742 value = enum_next_value;
5744 error ("overflow in enumeration values");
5747 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5749 pedwarn ("ISO C restricts enumerator values to range of `int'");
5750 value = convert (integer_type_node, value);
5753 /* Set basis for default for next value. */
5754 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5755 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5757 /* Now create a declaration for the enum value name. */
5759 type = TREE_TYPE (value);
5760 type = type_for_size (MAX (TYPE_PRECISION (type),
5761 TYPE_PRECISION (integer_type_node)),
5763 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
5764 && TREE_UNSIGNED (type)));
5766 decl = build_decl (CONST_DECL, name, type);
5767 DECL_INITIAL (decl) = convert (type, value);
5770 return tree_cons (decl, value, NULL_TREE);
5773 /* Create the FUNCTION_DECL for a function definition.
5774 DECLSPECS, DECLARATOR, PREFIX_ATTRIBUTES and ATTRIBUTES are the parts of
5775 the declaration; they describe the function's name and the type it returns,
5776 but twisted together in a fashion that parallels the syntax of C.
5778 This function creates a binding context for the function body
5779 as well as setting up the FUNCTION_DECL in current_function_decl.
5781 Returns 1 on success. If the DECLARATOR is not suitable for a function
5782 (it defines a datum instead), we return 0, which tells
5783 yyparse to report a parse error. */
5786 start_function (declspecs, declarator, prefix_attributes, attributes)
5787 tree declarator, declspecs, prefix_attributes, attributes;
5789 tree decl1, old_decl;
5791 int old_immediate_size_expand = immediate_size_expand;
5793 current_function_returns_value = 0; /* Assume, until we see it does. */
5794 current_function_returns_null = 0;
5795 warn_about_return_type = 0;
5796 current_extern_inline = 0;
5797 c_function_varargs = 0;
5799 shadowed_labels = 0;
5801 /* Don't expand any sizes in the return type of the function. */
5802 immediate_size_expand = 0;
5804 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
5806 /* If the declarator is not suitable for a function definition,
5807 cause a syntax error. */
5810 immediate_size_expand = old_immediate_size_expand;
5814 decl_attributes (decl1, prefix_attributes, attributes);
5816 announce_function (decl1);
5818 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5820 error ("return type is an incomplete type");
5821 /* Make it return void instead. */
5823 = build_function_type (void_type_node,
5824 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5827 if (warn_about_return_type)
5828 pedwarn_c99 ("return type defaults to `int'");
5830 /* Save the parm names or decls from this function's declarator
5831 where store_parm_decls will find them. */
5832 current_function_parms = last_function_parms;
5833 current_function_parm_tags = last_function_parm_tags;
5835 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5836 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5837 DECL_INITIAL (decl1) = error_mark_node;
5839 /* If this definition isn't a prototype and we had a prototype declaration
5840 before, copy the arg type info from that prototype.
5841 But not if what we had before was a builtin function. */
5842 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5843 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5844 && !DECL_BUILT_IN (old_decl)
5845 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5846 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5847 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5849 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5850 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
5851 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
5854 /* If there is no explicit declaration, look for any out-of-scope implicit
5857 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
5859 /* Optionally warn of old-fashioned def with no previous prototype. */
5860 if (warn_strict_prototypes
5861 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5862 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
5863 warning ("function declaration isn't a prototype");
5864 /* Optionally warn of any global def with no previous prototype. */
5865 else if (warn_missing_prototypes
5866 && TREE_PUBLIC (decl1)
5867 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0)
5868 && ! MAIN_NAME_P (DECL_NAME (decl1)))
5869 warning_with_decl (decl1, "no previous prototype for `%s'");
5870 /* Optionally warn of any def with no previous prototype
5871 if the function has already been used. */
5872 else if (warn_missing_prototypes
5873 && old_decl != 0 && TREE_USED (old_decl)
5874 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5875 warning_with_decl (decl1,
5876 "`%s' was used with no prototype before its definition");
5877 /* Optionally warn of any global def with no previous declaration. */
5878 else if (warn_missing_declarations
5879 && TREE_PUBLIC (decl1)
5881 && ! MAIN_NAME_P (DECL_NAME (decl1)))
5882 warning_with_decl (decl1, "no previous declaration for `%s'");
5883 /* Optionally warn of any def with no previous declaration
5884 if the function has already been used. */
5885 else if (warn_missing_declarations
5886 && old_decl != 0 && TREE_USED (old_decl)
5887 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
5888 warning_with_decl (decl1,
5889 "`%s' was used with no declaration before its definition");
5891 /* This is a definition, not a reference.
5892 So normally clear DECL_EXTERNAL.
5893 However, `extern inline' acts like a declaration
5894 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5895 DECL_EXTERNAL (decl1) = current_extern_inline;
5897 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
5898 SET_DEFAULT_DECL_ATTRIBUTES (decl1, attributes);
5901 /* This function exists in static storage.
5902 (This does not mean `static' in the C sense!) */
5903 TREE_STATIC (decl1) = 1;
5905 /* A nested function is not global. */
5906 if (current_function_decl != 0)
5907 TREE_PUBLIC (decl1) = 0;
5909 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5910 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
5915 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5916 != integer_type_node)
5917 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
5919 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
5920 args = TREE_CHAIN (args))
5922 tree type = args ? TREE_VALUE (args) : 0;
5924 if (type == void_type_node)
5931 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
5932 pedwarn_with_decl (decl1,
5933 "first argument of `%s' should be `int'");
5937 if (TREE_CODE (type) != POINTER_TYPE
5938 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5939 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5941 pedwarn_with_decl (decl1,
5942 "second argument of `%s' should be `char **'");
5946 if (TREE_CODE (type) != POINTER_TYPE
5947 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5948 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5950 pedwarn_with_decl (decl1,
5951 "third argument of `%s' should probably be `char **'");
5956 /* It is intentional that this message does not mention the third
5957 argument, which is warned for only pedantically, because it's
5958 blessed by mention in an appendix of the standard. */
5959 if (argct > 0 && (argct < 2 || argct > 3))
5960 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
5962 if (argct == 3 && pedantic)
5963 pedwarn_with_decl (decl1, "third argument of `%s' is deprecated");
5965 if (! TREE_PUBLIC (decl1))
5966 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
5969 /* Record the decl so that the function name is defined.
5970 If we already have a decl for this name, and it is a FUNCTION_DECL,
5971 use the old decl. */
5973 current_function_decl = pushdecl (decl1);
5976 declare_parm_level (1);
5977 current_binding_level->subblocks_tag_transparent = 1;
5979 make_function_rtl (current_function_decl);
5981 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5982 /* Promote the value to int before returning it. */
5983 if (C_PROMOTING_INTEGER_TYPE_P (restype))
5985 /* It retains unsignedness if traditional
5986 or if not really getting wider. */
5987 if (TREE_UNSIGNED (restype)
5988 && (flag_traditional
5989 || (TYPE_PRECISION (restype)
5990 == TYPE_PRECISION (integer_type_node))))
5991 restype = unsigned_type_node;
5993 restype = integer_type_node;
5995 DECL_RESULT (current_function_decl)
5996 = build_decl (RESULT_DECL, NULL_TREE, restype);
5998 /* If this fcn was already referenced via a block-scope `extern' decl
5999 (or an implicit decl), propagate certain information about the usage. */
6000 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6001 TREE_ADDRESSABLE (current_function_decl) = 1;
6003 immediate_size_expand = old_immediate_size_expand;
6008 /* Record that this function is going to be a varargs function.
6009 This is called before store_parm_decls, which is too early
6010 to call mark_varargs directly. */
6015 c_function_varargs = 1;
6018 /* Store the parameter declarations into the current function declaration.
6019 This is called after parsing the parameter declarations, before
6020 digesting the body of the function.
6022 For an old-style definition, modify the function's type
6023 to specify at least the number of arguments. */
6028 register tree fndecl = current_function_decl;
6031 /* This is either a chain of PARM_DECLs (if a prototype was used)
6032 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6033 tree specparms = current_function_parms;
6035 /* This is a list of types declared among parms in a prototype. */
6036 tree parmtags = current_function_parm_tags;
6038 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6039 register tree parmdecls = getdecls ();
6041 /* This is a chain of any other decls that came in among the parm
6042 declarations. If a parm is declared with enum {foo, bar} x;
6043 then CONST_DECLs for foo and bar are put here. */
6046 /* Nonzero if this definition is written with a prototype. */
6049 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6051 /* This case is when the function was defined with an ANSI prototype.
6052 The parms already have decls, so we need not do anything here
6053 except record them as in effect
6054 and complain if any redundant old-style parm decls were written. */
6065 error_with_decl (fndecl,
6066 "parm types given both in parmlist and separately");
6067 /* Get rid of the erroneous decls; don't keep them on
6068 the list of parms, since they might not be PARM_DECLs. */
6069 for (decl = current_binding_level->names;
6070 decl; decl = TREE_CHAIN (decl))
6071 if (DECL_NAME (decl))
6072 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6073 for (link = current_binding_level->shadowed;
6074 link; link = TREE_CHAIN (link))
6075 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6076 current_binding_level->names = 0;
6077 current_binding_level->shadowed = 0;
6080 specparms = nreverse (specparms);
6081 for (parm = specparms; parm; parm = next)
6083 next = TREE_CHAIN (parm);
6084 if (TREE_CODE (parm) == PARM_DECL)
6086 if (DECL_NAME (parm) == 0)
6087 error_with_decl (parm, "parameter name omitted");
6088 else if (TREE_CODE (TREE_TYPE (parm)) != ERROR_MARK
6089 && VOID_TYPE_P (TREE_TYPE (parm)))
6091 error_with_decl (parm, "parameter `%s' declared void");
6092 /* Change the type to error_mark_node so this parameter
6093 will be ignored by assign_parms. */
6094 TREE_TYPE (parm) = error_mark_node;
6100 /* If we find an enum constant or a type tag,
6101 put it aside for the moment. */
6102 TREE_CHAIN (parm) = 0;
6103 others = chainon (others, parm);
6107 /* Get the decls in their original chain order
6108 and record in the function. */
6109 DECL_ARGUMENTS (fndecl) = getdecls ();
6112 /* If this function takes a variable number of arguments,
6113 add a phony parameter to the end of the parm list,
6114 to represent the position of the first unnamed argument. */
6115 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6118 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6119 /* Let's hope the address of the unnamed parm
6120 won't depend on its type. */
6121 TREE_TYPE (dummy) = integer_type_node;
6122 DECL_ARG_TYPE (dummy) = integer_type_node;
6123 DECL_ARGUMENTS (fndecl) = chainon (DECL_ARGUMENTS (fndecl), dummy);
6127 /* Now pushdecl the enum constants. */
6128 for (parm = others; parm; parm = next)
6130 next = TREE_CHAIN (parm);
6131 if (DECL_NAME (parm) == 0)
6133 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6135 else if (TREE_CODE (parm) != PARM_DECL)
6139 storetags (chainon (parmtags, gettags ()));
6143 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6144 each with a parm name as the TREE_VALUE.
6146 PARMDECLS is a chain of declarations for parameters.
6147 Warning! It can also contain CONST_DECLs which are not parameters
6148 but are names of enumerators of any enum types
6149 declared among the parameters.
6151 First match each formal parameter name with its declaration.
6152 Associate decls with the names and store the decls
6153 into the TREE_PURPOSE slots. */
6155 /* We use DECL_WEAK as a flag to show which parameters have been
6156 seen already since it is not used on PARM_DECL or CONST_DECL. */
6157 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6158 DECL_WEAK (parm) = 0;
6160 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6162 register tree tail, found = NULL;
6164 if (TREE_VALUE (parm) == 0)
6166 error_with_decl (fndecl,
6167 "parameter name missing from parameter list");
6168 TREE_PURPOSE (parm) = 0;
6172 /* See if any of the parmdecls specifies this parm by name.
6173 Ignore any enumerator decls. */
6174 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6175 if (DECL_NAME (tail) == TREE_VALUE (parm)
6176 && TREE_CODE (tail) == PARM_DECL)
6182 /* If declaration already marked, we have a duplicate name.
6183 Complain, and don't use this decl twice. */
6184 if (found && DECL_WEAK (found))
6186 error_with_decl (found, "multiple parameters named `%s'");
6190 /* If the declaration says "void", complain and ignore it. */
6191 if (found && VOID_TYPE_P (TREE_TYPE (found)))
6193 error_with_decl (found, "parameter `%s' declared void");
6194 TREE_TYPE (found) = integer_type_node;
6195 DECL_ARG_TYPE (found) = integer_type_node;
6196 layout_decl (found, 0);
6199 /* Traditionally, a parm declared float is actually a double. */
6200 if (found && flag_traditional
6201 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6203 TREE_TYPE (found) = double_type_node;
6204 DECL_ARG_TYPE (found) = double_type_node;
6205 layout_decl (found, 0);
6208 /* If no declaration found, default to int. */
6211 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6213 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6214 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6215 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6217 pedwarn_with_decl (found, "type of `%s' defaults to `int'");
6218 else if (extra_warnings)
6219 warning_with_decl (found, "type of `%s' defaults to `int'");
6223 TREE_PURPOSE (parm) = found;
6225 /* Mark this decl as "already found". */
6226 DECL_WEAK (found) = 1;
6229 /* Put anything which is on the parmdecls chain and which is
6230 not a PARM_DECL onto the list NONPARMS. (The types of
6231 non-parm things which might appear on the list include
6232 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6233 any actual PARM_DECLs not matched with any names. */
6236 for (parm = parmdecls; parm;)
6238 tree next = TREE_CHAIN (parm);
6239 TREE_CHAIN (parm) = 0;
6241 if (TREE_CODE (parm) != PARM_DECL)
6242 nonparms = chainon (nonparms, parm);
6245 /* Complain about args with incomplete types. */
6246 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6248 error_with_decl (parm, "parameter `%s' has incomplete type");
6249 TREE_TYPE (parm) = error_mark_node;
6252 if (! DECL_WEAK (parm))
6254 error_with_decl (parm,
6255 "declaration for parameter `%s' but no such parameter");
6256 /* Pretend the parameter was not missing.
6257 This gets us to a standard state and minimizes
6258 further error messages. */
6260 = chainon (specparms,
6261 tree_cons (parm, NULL_TREE, NULL_TREE));
6268 /* Chain the declarations together in the order of the list of
6269 names. Store that chain in the function decl, replacing the
6272 DECL_ARGUMENTS (fndecl) = 0;
6275 for (last = 0; parm; parm = TREE_CHAIN (parm))
6276 if (TREE_PURPOSE (parm))
6279 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6281 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6282 last = TREE_PURPOSE (parm);
6283 TREE_CHAIN (last) = 0;
6287 /* If there was a previous prototype,
6288 set the DECL_ARG_TYPE of each argument according to
6289 the type previously specified, and report any mismatches. */
6291 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6294 for (parm = DECL_ARGUMENTS (fndecl),
6295 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6296 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6297 != void_type_node));
6298 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6300 if (parm == 0 || type == 0
6301 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6303 error ("number of arguments doesn't match prototype");
6304 error_with_file_and_line (current_function_prototype_file,
6305 current_function_prototype_line,
6306 "prototype declaration");
6309 /* Type for passing arg must be consistent
6310 with that declared for the arg. */
6311 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
6313 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6314 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6316 /* Adjust argument to match prototype. E.g. a previous
6317 `int foo(float);' prototype causes
6318 `int foo(x) float x; {...}' to be treated like
6319 `int foo(float x) {...}'. This is particularly
6320 useful for argument types like uid_t. */
6321 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6323 if (PROMOTE_PROTOTYPES
6324 && (TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
6325 || TREE_CODE (TREE_TYPE (parm)) == ENUMERAL_TYPE)
6326 && TYPE_PRECISION (TREE_TYPE (parm))
6327 < TYPE_PRECISION (integer_type_node))
6328 DECL_ARG_TYPE (parm) = integer_type_node;
6332 pedwarn ("promoted argument `%s' doesn't match prototype",
6333 IDENTIFIER_POINTER (DECL_NAME (parm)));
6334 warning_with_file_and_line
6335 (current_function_prototype_file,
6336 current_function_prototype_line,
6337 "prototype declaration");
6340 /* If -traditional, allow `int' argument to match
6341 `unsigned' prototype. */
6342 else if (! (flag_traditional
6343 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6344 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6346 error ("argument `%s' doesn't match prototype",
6347 IDENTIFIER_POINTER (DECL_NAME (parm)));
6348 error_with_file_and_line (current_function_prototype_file,
6349 current_function_prototype_line,
6350 "prototype declaration");
6354 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6357 /* Otherwise, create a prototype that would match. */
6361 tree actual = 0, last = 0, type;
6363 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6365 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6367 TREE_CHAIN (last) = type;
6372 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6374 TREE_CHAIN (last) = type;
6378 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6379 of the type of this function, but we need to avoid having this
6380 affect the types of other similarly-typed functions, so we must
6381 first force the generation of an identical (but separate) type
6382 node for the relevant function type. The new node we create
6383 will be a variant of the main variant of the original function
6386 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6388 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6391 /* Now store the final chain of decls for the arguments
6392 as the decl-chain of the current lexical scope.
6393 Put the enumerators in as well, at the front so that
6394 DECL_ARGUMENTS is not modified. */
6396 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6399 /* Make sure the binding level for the top of the function body
6400 gets a BLOCK if there are any in the function.
6401 Otherwise, the dbx output is wrong. */
6403 keep_next_if_subblocks = 1;
6405 /* ??? This might be an improvement,
6406 but needs to be thought about some more. */
6408 keep_next_level_flag = 1;
6411 /* Write a record describing this function definition to the prototypes
6412 file (if requested). */
6414 gen_aux_info_record (fndecl, 1, 0, prototype);
6416 /* Initialize the RTL code for the function. */
6418 init_function_start (fndecl, input_filename, lineno);
6420 /* If this is a varargs function, inform function.c. */
6422 if (c_function_varargs)
6425 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
6427 declare_function_name ();
6429 /* Set up parameters and prepare for return, for the function. */
6431 expand_function_start (fndecl, 0);
6433 /* If this function is `main', emit a call to `__main'
6434 to run global initializers, etc. */
6435 if (DECL_NAME (fndecl)
6436 && MAIN_NAME_P (DECL_NAME (fndecl))
6437 && DECL_CONTEXT (fndecl) == NULL_TREE)
6438 expand_main_function ();
6441 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6442 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6443 stands for an ellipsis in the identifier list.
6445 PARMLIST is the data returned by get_parm_info for the
6446 parmlist that follows the semicolon.
6448 We return a value of the same sort that get_parm_info returns,
6449 except that it describes the combination of identifiers and parmlist. */
6452 combine_parm_decls (specparms, parmlist, void_at_end)
6453 tree specparms, parmlist;
6456 register tree fndecl = current_function_decl;
6459 tree parmdecls = TREE_PURPOSE (parmlist);
6461 /* This is a chain of any other decls that came in among the parm
6462 declarations. They were separated already by get_parm_info,
6463 so we just need to keep them separate. */
6464 tree nonparms = TREE_VALUE (parmlist);
6468 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6469 DECL_WEAK (parm) = 0;
6471 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6473 register tree tail, found = NULL;
6475 /* See if any of the parmdecls specifies this parm by name. */
6476 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6477 if (DECL_NAME (tail) == TREE_VALUE (parm))
6483 /* If declaration already marked, we have a duplicate name.
6484 Complain, and don't use this decl twice. */
6485 if (found && DECL_WEAK (found))
6487 error_with_decl (found, "multiple parameters named `%s'");
6491 /* If the declaration says "void", complain and ignore it. */
6492 if (found && VOID_TYPE_P (TREE_TYPE (found)))
6494 error_with_decl (found, "parameter `%s' declared void");
6495 TREE_TYPE (found) = integer_type_node;
6496 DECL_ARG_TYPE (found) = integer_type_node;
6497 layout_decl (found, 0);
6500 /* Traditionally, a parm declared float is actually a double. */
6501 if (found && flag_traditional
6502 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6504 TREE_TYPE (found) = double_type_node;
6505 DECL_ARG_TYPE (found) = double_type_node;
6506 layout_decl (found, 0);
6509 /* If no declaration found, default to int. */
6512 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6514 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6515 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6516 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6517 error_with_decl (found, "type of parameter `%s' is not declared");
6521 TREE_PURPOSE (parm) = found;
6523 /* Mark this decl as "already found". */
6524 DECL_WEAK (found) = 1;
6527 /* Complain about any actual PARM_DECLs not matched with any names. */
6529 for (parm = parmdecls; parm;)
6531 tree next = TREE_CHAIN (parm);
6532 TREE_CHAIN (parm) = 0;
6534 /* Complain about args with incomplete types. */
6535 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6537 error_with_decl (parm, "parameter `%s' has incomplete type");
6538 TREE_TYPE (parm) = error_mark_node;
6541 if (! DECL_WEAK (parm))
6543 error_with_decl (parm,
6544 "declaration for parameter `%s' but no such parameter");
6545 /* Pretend the parameter was not missing.
6546 This gets us to a standard state and minimizes
6547 further error messages. */
6549 = chainon (specparms,
6550 tree_cons (parm, NULL_TREE, NULL_TREE));
6556 /* Chain the declarations together in the order of the list of names.
6557 At the same time, build up a list of their types, in reverse order. */
6563 for (last = 0; parm; parm = TREE_CHAIN (parm))
6564 if (TREE_PURPOSE (parm))
6567 parmdecls = TREE_PURPOSE (parm);
6569 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6570 last = TREE_PURPOSE (parm);
6571 TREE_CHAIN (last) = 0;
6573 types = tree_cons (NULL_TREE, TREE_TYPE (parm), types);
6578 return tree_cons (parmdecls, nonparms,
6579 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
6581 return tree_cons (parmdecls, nonparms, nreverse (types));
6584 /* Finish up a function declaration and compile that function
6585 all the way to assembler language output. The free the storage
6586 for the function definition.
6588 This is called after parsing the body of the function definition.
6590 NESTED is nonzero if the function being finished is nested in another. */
6593 finish_function (nested)
6596 register tree fndecl = current_function_decl;
6598 /* TREE_READONLY (fndecl) = 1;
6599 This caused &foo to be of type ptr-to-const-function
6600 which then got a warning when stored in a ptr-to-function variable. */
6603 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6605 /* Must mark the RESULT_DECL as being in this function. */
6607 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6609 /* Obey `register' declarations if `setjmp' is called in this fn. */
6610 if (flag_traditional && current_function_calls_setjmp)
6612 setjmp_protect (DECL_INITIAL (fndecl));
6613 setjmp_protect_args ();
6616 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6618 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6619 != integer_type_node)
6621 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6622 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6624 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
6628 #ifdef DEFAULT_MAIN_RETURN
6629 /* Make it so that `main' always returns success by default. */
6630 DEFAULT_MAIN_RETURN;
6633 c_expand_return (integer_zero_node);
6638 /* Generate rtl for function exit. */
6639 expand_function_end (input_filename, lineno, 0);
6641 /* So we can tell if jump_optimize sets it to 1. */
6644 /* If this is a nested function, protect the local variables in the stack
6645 above us from being collected while we're compiling this function. */
6647 ggc_push_context ();
6649 /* Run the optimizers and output the assembler code for this function. */
6650 rest_of_compilation (fndecl);
6652 /* Undo the GC context switch. */
6656 current_function_returns_null |= can_reach_end;
6658 if (warn_missing_noreturn
6659 && !TREE_THIS_VOLATILE (fndecl)
6660 && !current_function_returns_null
6661 && !current_function_returns_value)
6662 warning ("function might be possible candidate for attribute `noreturn'");
6664 if (TREE_THIS_VOLATILE (fndecl) && current_function_returns_null)
6665 warning ("`noreturn' function does return");
6666 else if (warn_return_type && can_reach_end
6667 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (fndecl))))
6668 /* If this function returns non-void and control can drop through,
6670 warning ("control reaches end of non-void function");
6671 /* With just -W, complain only if function returns both with
6672 and without a value. */
6673 else if (extra_warnings
6674 && current_function_returns_value && current_function_returns_null)
6675 warning ("this function may return with or without a value");
6677 /* If requested, warn about function definitions where the function will
6678 return a value (usually of some struct or union type) which itself will
6679 take up a lot of stack space. */
6681 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6683 tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6685 if (ret_type && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST
6686 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type),
6689 unsigned int size_as_int
6690 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type));
6692 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0)
6693 warning_with_decl (fndecl,
6694 "size of return value of `%s' is %u bytes",
6697 warning_with_decl (fndecl,
6698 "size of return value of `%s' is larger than %d bytes",
6703 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested)
6705 /* Stop pointing to the local nodes about to be freed.
6706 But DECL_INITIAL must remain nonzero so we know this
6707 was an actual function definition.
6708 For a nested function, this is done in pop_c_function_context.
6709 If rest_of_compilation set this to 0, leave it 0. */
6710 if (DECL_INITIAL (fndecl) != 0)
6711 DECL_INITIAL (fndecl) = error_mark_node;
6713 DECL_ARGUMENTS (fndecl) = 0;
6716 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6718 #ifndef ASM_OUTPUT_CONSTRUCTOR
6719 if (! flag_gnu_linker)
6720 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6723 assemble_constructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl)));
6726 if (DECL_STATIC_DESTRUCTOR (fndecl))
6728 #ifndef ASM_OUTPUT_DESTRUCTOR
6729 if (! flag_gnu_linker)
6730 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6733 assemble_destructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl)));
6738 /* Let the error reporting routines know that we're outside a
6739 function. For a nested function, this value is used in
6740 pop_c_function_context and then reset via pop_function_context. */
6741 current_function_decl = NULL;
6745 /* Save and restore the variables in this file and elsewhere
6746 that keep track of the progress of compilation of the current function.
6747 Used for nested functions. */
6749 struct language_function
6752 tree shadowed_labels;
6755 int warn_about_return_type;
6757 struct binding_level *binding_level;
6760 /* Save and reinitialize the variables
6761 used during compilation of a C function. */
6764 push_c_function_context (f)
6767 struct language_function *p;
6768 p = (struct language_function *) xmalloc (sizeof (struct language_function));
6771 p->named_labels = named_labels;
6772 p->shadowed_labels = shadowed_labels;
6773 p->returns_value = current_function_returns_value;
6774 p->returns_null = current_function_returns_null;
6775 p->warn_about_return_type = warn_about_return_type;
6776 p->extern_inline = current_extern_inline;
6777 p->binding_level = current_binding_level;
6780 /* Restore the variables used during compilation of a C function. */
6783 pop_c_function_context (f)
6786 struct language_function *p = f->language;
6789 /* Bring back all the labels that were shadowed. */
6790 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
6791 if (DECL_NAME (TREE_VALUE (link)) != 0)
6792 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
6793 = TREE_VALUE (link);
6795 if (DECL_SAVED_INSNS (current_function_decl) == 0)
6797 /* Stop pointing to the local nodes about to be freed. */
6798 /* But DECL_INITIAL must remain nonzero so we know this
6799 was an actual function definition. */
6800 DECL_INITIAL (current_function_decl) = error_mark_node;
6801 DECL_ARGUMENTS (current_function_decl) = 0;
6804 named_labels = p->named_labels;
6805 shadowed_labels = p->shadowed_labels;
6806 current_function_returns_value = p->returns_value;
6807 current_function_returns_null = p->returns_null;
6808 warn_about_return_type = p->warn_about_return_type;
6809 current_extern_inline = p->extern_inline;
6810 current_binding_level = p->binding_level;
6816 /* Mark the language specific parts of F for GC. */
6819 mark_c_function_context (f)
6822 struct language_function *p = f->language;
6827 ggc_mark_tree (p->shadowed_labels);
6828 ggc_mark_tree (p->named_labels);
6829 mark_binding_level (&p->binding_level);
6832 /* integrate_decl_tree calls this function, but since we don't use the
6833 DECL_LANG_SPECIFIC field, this is a no-op. */
6836 copy_lang_decl (node)
6837 tree node ATTRIBUTE_UNUSED;
6841 /* Mark ARG for GC. */
6844 lang_mark_false_label_stack (arg)
6845 struct label_node *arg;
6847 /* C doesn't use false_label_stack. It better be NULL. */
6852 /* Mark the language specific bits in T for GC. */
6858 if (TREE_CODE (t) == IDENTIFIER_NODE)
6860 struct lang_identifier *i = (struct lang_identifier *) t;
6861 ggc_mark_tree (i->global_value);
6862 ggc_mark_tree (i->local_value);
6863 ggc_mark_tree (i->label_value);
6864 ggc_mark_tree (i->implicit_decl);
6865 ggc_mark_tree (i->error_locus);
6866 ggc_mark_tree (i->limbo_value);
6868 else if (TYPE_P (t) && TYPE_LANG_SPECIFIC (t))
6869 ggc_mark (TYPE_LANG_SPECIFIC (t));
6872 /* The functions below are required for functionality of doing
6873 function at once processing in the C front end. Currently these
6874 functions are not called from anywhere in the C front end, but as
6875 these changes continue, that will change. */
6877 /* Returns non-zero if the current statement is a full expression,
6878 i.e. temporaries created during that statement should be destroyed
6879 at the end of the statement. */
6882 stmts_are_full_exprs_p ()
6887 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6891 anon_aggr_type_p (node)
6892 tree node ATTRIBUTE_UNUSED;
6897 /* One if we have already declared __FUNCTION__ (and related
6898 variables) in the current function. Two if we are in the process
6902 current_function_name_declared ()
6908 /* Code to generate the RTL for a case label in C. */
6911 do_case (low_value, high_value)
6915 tree value1 = NULL_TREE, value2 = NULL_TREE, label;
6917 if (low_value != NULL_TREE)
6918 value1 = check_case_value (low_value);
6919 if (high_value != NULL_TREE)
6920 value2 = check_case_value (high_value);
6922 label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
6924 if (pedantic && (high_value != NULL_TREE))
6925 pedwarn ("ISO C forbids case ranges");
6927 if (value1 != error_mark_node && value2 != error_mark_node)
6932 if (high_value == NULL_TREE && value1 != NULL_TREE &&
6933 pedantic && ! INTEGRAL_TYPE_P (TREE_TYPE (value1)))
6934 pedwarn ("label must have integral type in ISO C");
6936 if (low_value == NULL_TREE)
6937 success = pushcase (NULL_TREE, 0, label, &duplicate);
6938 else if (high_value == NULL_TREE)
6939 success = pushcase (value1, convert_and_check, label, &duplicate);
6941 success = pushcase_range (value1, value2, convert_and_check,
6946 if (low_value == NULL_TREE)
6947 error ("default label not within a switch statement");
6949 error ("case label not within a switch statement");
6951 else if (success == 2)
6953 if (low_value == NULL_TREE)
6955 error ("multiple default labels in one switch");
6956 error_with_decl (duplicate, "this is the first default label");
6959 error ("dupicate case value");
6960 if (high_value != NULL_TREE)
6961 error_with_decl (duplicate,
6962 "this is the first entry for that value");
6964 else if (low_value != NULL_TREE)
6967 warning ("case value out of range");
6968 else if (success == 5)
6969 error ("case label within scope of cleanup or variable array");
6974 /* Language specific handler of tree nodes used when generating RTL
6978 lang_expand_stmt (t)
6979 tree t ATTRIBUTE_UNUSED;
6985 /* Accessor to set the 'current_function_name_declared' flag. */
6988 set_current_function_name_declared (i)
6989 int i ATTRIBUTE_UNUSED;