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"
82 #define INTMAX_TYPE ((INT_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \
84 : ((LONG_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \
90 #define UINTMAX_TYPE ((INT_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \
92 : ((LONG_TYPE_SIZE == LONG_LONG_TYPE_SIZE) \
93 ? "long unsigned int" \
94 : "long long unsigned int"))
97 /* Nonzero if we have seen an invalid cross reference
98 to a struct, union, or enum, but not yet printed the message. */
100 tree pending_invalid_xref;
101 /* File and line to appear in the eventual error message. */
102 const char *pending_invalid_xref_file;
103 int pending_invalid_xref_line;
105 /* While defining an enum type, this is 1 plus the last enumerator
106 constant value. Note that will do not have to save this or `enum_overflow'
107 around nested function definition since such a definition could only
108 occur in an enum value expression and we don't use these variables in
111 static tree enum_next_value;
113 /* Nonzero means that there was overflow computing enum_next_value. */
115 static int enum_overflow;
117 /* Parsing a function declarator leaves a list of parameter names
118 or a chain or parameter decls here. */
120 static tree last_function_parms;
122 /* Parsing a function declarator leaves here a chain of structure
123 and enum types declared in the parmlist. */
125 static tree last_function_parm_tags;
127 /* After parsing the declarator that starts a function definition,
128 `start_function' puts here the list of parameter names or chain of decls.
129 `store_parm_decls' finds it here. */
131 static tree current_function_parms;
133 /* Similar, for last_function_parm_tags. */
134 static tree current_function_parm_tags;
136 /* Similar, for the file and line that the prototype came from if this is
137 an old-style definition. */
138 static const char *current_function_prototype_file;
139 static int current_function_prototype_line;
141 /* The current statement tree. */
143 static struct stmt_tree_s c_stmt_tree;
145 /* The current scope statement stack. */
147 static tree c_scope_stmt_stack;
149 /* Nonzero if __FUNCTION__ and its ilk have been declared in this
152 static int c_function_name_declared_p;
154 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
155 that have names. Here so we can clear out their names' definitions
156 at the end of the function. */
158 static tree named_labels;
160 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
162 static tree shadowed_labels;
164 /* Nonzero when store_parm_decls is called indicates a varargs function.
165 Value not meaningful after store_parm_decls. */
167 static int c_function_varargs;
169 /* Set to 0 at beginning of a function definition, set to 1 if
170 a return statement that specifies a return value is seen. */
172 int current_function_returns_value;
174 /* Set to 0 at beginning of a function definition, set to 1 if
175 a return statement with no argument is seen. */
177 int current_function_returns_null;
179 /* Set to nonzero by `grokdeclarator' for a function
180 whose return type is defaulted, if warnings for this are desired. */
182 static int warn_about_return_type;
184 /* Nonzero when starting a function declared `extern inline'. */
186 static int current_extern_inline;
188 /* For each binding contour we allocate a binding_level structure
189 * which records the names defined in that contour.
192 * 1) one for each function definition,
193 * where internal declarations of the parameters appear.
194 * 2) one for each compound statement,
195 * to record its declarations.
197 * The current meaning of a name can be found by searching the levels from
198 * the current one out to the global one.
201 /* Note that the information in the `names' component of the global contour
202 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
206 /* A chain of _DECL nodes for all variables, constants, functions,
207 and typedef types. These are in the reverse of the order supplied.
211 /* A list of structure, union and enum definitions,
212 * for looking up tag names.
213 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
214 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
215 * or ENUMERAL_TYPE node.
219 /* For each level, a list of shadowed outer-level local definitions
220 to be restored when this level is popped.
221 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
222 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
225 /* For each level (except not the global one),
226 a chain of BLOCK nodes for all the levels
227 that were entered and exited one level down. */
230 /* The BLOCK node for this level, if one has been preallocated.
231 If 0, the BLOCK is allocated (if needed) when the level is popped. */
234 /* The binding level which this one is contained in (inherits from). */
235 struct binding_level *level_chain;
237 /* Nonzero for the level that holds the parameters of a function. */
240 /* Nonzero if this level "doesn't exist" for tags. */
241 char tag_transparent;
243 /* Nonzero if sublevels of this level "don't exist" for tags.
244 This is set in the parm level of a function definition
245 while reading the function body, so that the outermost block
246 of the function body will be tag-transparent. */
247 char subblocks_tag_transparent;
249 /* Nonzero means make a BLOCK for this level regardless of all else. */
252 /* Nonzero means make a BLOCK if this level has any subblocks. */
253 char keep_if_subblocks;
255 /* Number of decls in `names' that have incomplete
256 structure or union types. */
259 /* A list of decls giving the (reversed) specified order of parms,
260 not including any forward-decls in the parmlist.
261 This is so we can put the parms in proper order for assign_parms. */
265 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
267 /* The binding level currently in effect. */
269 static struct binding_level *current_binding_level;
271 /* A chain of binding_level structures awaiting reuse. */
273 static struct binding_level *free_binding_level;
275 /* The outermost binding level, for names of file scope.
276 This is created when the compiler is started and exists
277 through the entire run. */
279 static struct binding_level *global_binding_level;
281 /* Binding level structures are initialized by copying this one. */
283 static struct binding_level clear_binding_level
284 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, 0,
287 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
289 static int keep_next_level_flag;
291 /* Nonzero means make a BLOCK for the next level pushed
292 if it has subblocks. */
294 static int keep_next_if_subblocks;
296 /* The chain of outer levels of label scopes.
297 This uses the same data structure used for binding levels,
298 but it works differently: each link in the chain records
299 saved values of named_labels and shadowed_labels for
300 a label binding level outside the current one. */
302 static struct binding_level *label_level_chain;
304 /* Functions called automatically at the beginning and end of execution. */
306 tree static_ctors, static_dtors;
308 /* Forward declarations. */
310 static struct binding_level * make_binding_level PARAMS ((void));
311 static void mark_binding_level PARAMS ((void *));
312 static void clear_limbo_values PARAMS ((tree));
313 static int duplicate_decls PARAMS ((tree, tree, int));
314 static int redeclaration_error_message PARAMS ((tree, tree));
315 static void storedecls PARAMS ((tree));
316 static void storetags PARAMS ((tree));
317 static tree lookup_tag PARAMS ((enum tree_code, tree,
318 struct binding_level *, int));
319 static tree lookup_tag_reverse PARAMS ((tree));
320 static tree grokdeclarator PARAMS ((tree, tree, enum decl_context,
322 static tree grokparms PARAMS ((tree, int));
323 static void layout_array_type PARAMS ((tree));
324 static tree c_make_fname_decl PARAMS ((tree, const char *, int));
325 static void c_expand_body PARAMS ((tree, int));
327 /* C-specific option variables. */
329 /* Nonzero means allow type mismatches in conditional expressions;
330 just make their values `void'. */
332 int flag_cond_mismatch;
334 /* Nonzero means give `double' the same size as `float'. */
336 int flag_short_double;
338 /* Nonzero means give `wchar_t' the same size as `short'. */
340 int flag_short_wchar;
342 /* Nonzero means don't recognize the keyword `asm'. */
346 /* Nonzero means do some things the same way PCC does. */
348 int flag_traditional;
350 /* Nonzero means enable C89 Amendment 1 features, other than digraphs. */
354 /* Nonzero means use the ISO C99 dialect of C. */
358 /* Nonzero means accept digraphs. */
360 int flag_digraphs = 1;
362 /* Nonzero means that we have builtin functions, and main is an int */
366 /* Nonzero means add default format_arg attributes for functions not
369 int flag_noniso_default_format_attributes = 1;
371 /* Nonzero means to allow single precision math even if we're generally
372 being traditional. */
373 int flag_allow_single_precision = 0;
375 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
377 int flag_signed_bitfields = 1;
378 int explicit_flag_signed_bitfields = 0;
380 /* Nonzero means warn about use of implicit int. */
382 int warn_implicit_int;
384 /* Nonzero means warn about usage of long long when `-pedantic'. */
386 int warn_long_long = 1;
388 /* Nonzero means message about use of implicit function declarations;
389 1 means warning; 2 means error. */
391 int mesg_implicit_function_declaration = -1;
393 /* Nonzero means give string constants the type `const char *'
394 to get extra warnings from them. These warnings will be too numerous
395 to be useful, except in thoroughly ANSIfied programs. */
397 int flag_const_strings;
399 /* Nonzero means warn about pointer casts that can drop a type qualifier
400 from the pointer target type. */
404 /* Nonzero means warn when casting a function call to a type that does
405 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
406 when there is no previous declaration of sqrt or malloc. */
408 int warn_bad_function_cast;
410 /* Warn about functions which might be candidates for format attributes. */
412 int warn_missing_format_attribute;
414 /* Warn about traditional constructs whose meanings changed in ANSI C. */
416 int warn_traditional;
418 /* Nonzero means warn about sizeof(function) or addition/subtraction
419 of function pointers. */
421 int warn_pointer_arith;
423 /* Nonzero means warn for non-prototype function decls
424 or non-prototyped defs without previous prototype. */
426 int warn_strict_prototypes;
428 /* Nonzero means warn for any global function def
429 without separate previous prototype decl. */
431 int warn_missing_prototypes;
433 /* Nonzero means warn for any global function def
434 without separate previous decl. */
436 int warn_missing_declarations;
438 /* Nonzero means warn about multiple (redundant) decls for the same single
439 variable or function. */
441 int warn_redundant_decls = 0;
443 /* Nonzero means warn about extern declarations of objects not at
444 file-scope level and about *all* declarations of functions (whether
445 extern or static) not at file-scope level. Note that we exclude
446 implicit function declarations. To get warnings about those, use
449 int warn_nested_externs = 0;
451 /* Warn about *printf or *scanf format/argument anomalies. */
455 /* Warn about a subscript that has type char. */
457 int warn_char_subscripts = 0;
459 /* Warn if a type conversion is done that might have confusing results. */
463 /* Warn if adding () is suggested. */
465 int warn_parentheses;
467 /* Warn if initializer is not completely bracketed. */
469 int warn_missing_braces;
471 /* Warn if main is suspicious. */
475 /* Warn about #pragma directives that are not recognised. */
477 int warn_unknown_pragmas = 0; /* Tri state variable. */
479 /* Warn about comparison of signed and unsigned values.
480 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
482 int warn_sign_compare = -1;
484 /* Warn about testing equality of floating point numbers. */
486 int warn_float_equal = 0;
488 /* Nonzero means warn about use of multicharacter literals. */
490 int warn_multichar = 1;
492 /* The variant of the C language being processed. */
494 c_language_kind c_language = clk_c;
496 /* Nonzero means `$' can be in an identifier. */
498 #ifndef DOLLARS_IN_IDENTIFIERS
499 #define DOLLARS_IN_IDENTIFIERS 1
501 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
503 /* Decode the string P as a language-specific option for C.
504 Return the number of strings consumed. Should not complain
505 if it does not recognise the option. */
508 c_decode_option (argc, argv)
509 int argc ATTRIBUTE_UNUSED;
512 int strings_processed;
515 strings_processed = cpp_handle_option (&parse_in, argc, argv);
517 strings_processed = 0;
518 #endif /* ! USE_CPPLIB */
520 if (!strcmp (p, "-lang-objc"))
521 c_language = clk_objective_c;
522 else if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
524 flag_traditional = 1;
525 flag_writable_strings = 1;
528 else if (!strcmp (p, "-fallow-single-precision"))
529 flag_allow_single_precision = 1;
530 else if (!strcmp (p, "-fhosted") || !strcmp (p, "-fno-freestanding"))
535 else if (!strcmp (p, "-ffreestanding") || !strcmp (p, "-fno-hosted"))
539 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
543 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
545 flag_traditional = 0;
546 flag_writable_strings = 0;
549 else if (!strncmp (p, "-std=", 5))
551 /* Select the appropriate language standard. We currently
553 -std=iso9899:1990 same as -ansi
554 -std=iso9899:199409 ISO C as modified in amend. 1
555 -std=iso9899:1999 ISO C 99
556 -std=c89 same as -std=iso9899:1990
557 -std=c99 same as -std=iso9899:1999
558 -std=gnu89 default, iso9899:1990 + gnu extensions
559 -std=gnu99 iso9899:1999 + gnu extensions
561 const char *argstart = &p[5];
563 if (!strcmp (argstart, "iso9899:1990")
564 || !strcmp (argstart, "c89"))
570 flag_traditional = 0;
571 flag_writable_strings = 0;
573 flag_no_nonansi_builtin = 1;
574 flag_noniso_default_format_attributes = 0;
577 else if (!strcmp (argstart, "iso9899:199409"))
581 goto iso_1990_digraphs;
583 else if (!strcmp (argstart, "iso9899:199x")
584 || !strcmp (argstart, "iso9899:1999")
585 || !strcmp (argstart, "c9x")
586 || !strcmp (argstart, "c99"))
588 flag_traditional = 0;
589 flag_writable_strings = 0;
591 flag_no_nonansi_builtin = 1;
592 flag_noniso_default_format_attributes = 0;
597 else if (!strcmp (argstart, "gnu89"))
599 flag_traditional = 0;
600 flag_writable_strings = 0;
602 flag_no_nonansi_builtin = 0;
603 flag_noniso_default_format_attributes = 1;
608 else if (!strcmp (argstart, "gnu9x") || !strcmp (argstart, "gnu99"))
610 flag_traditional = 0;
611 flag_writable_strings = 0;
613 flag_no_nonansi_builtin = 0;
614 flag_noniso_default_format_attributes = 1;
620 error ("unknown C standard `%s'", argstart);
622 else if (!strcmp (p, "-fdollars-in-identifiers"))
623 dollars_in_ident = 1;
624 else if (!strcmp (p, "-fno-dollars-in-identifiers"))
625 dollars_in_ident = 0;
626 else if (!strcmp (p, "-fsigned-char"))
627 flag_signed_char = 1;
628 else if (!strcmp (p, "-funsigned-char"))
629 flag_signed_char = 0;
630 else if (!strcmp (p, "-fno-signed-char"))
631 flag_signed_char = 0;
632 else if (!strcmp (p, "-fno-unsigned-char"))
633 flag_signed_char = 1;
634 else if (!strcmp (p, "-fsigned-bitfields")
635 || !strcmp (p, "-fno-unsigned-bitfields"))
637 flag_signed_bitfields = 1;
638 explicit_flag_signed_bitfields = 1;
640 else if (!strcmp (p, "-funsigned-bitfields")
641 || !strcmp (p, "-fno-signed-bitfields"))
643 flag_signed_bitfields = 0;
644 explicit_flag_signed_bitfields = 1;
646 else if (!strcmp (p, "-fshort-enums"))
647 flag_short_enums = 1;
648 else if (!strcmp (p, "-fno-short-enums"))
649 flag_short_enums = 0;
650 else if (!strcmp (p, "-fshort-wchar"))
651 flag_short_wchar = 1;
652 else if (!strcmp (p, "-fno-short-wchar"))
653 flag_short_wchar = 0;
654 else if (!strcmp (p, "-fcond-mismatch"))
655 flag_cond_mismatch = 1;
656 else if (!strcmp (p, "-fno-cond-mismatch"))
657 flag_cond_mismatch = 0;
658 else if (!strcmp (p, "-fshort-double"))
659 flag_short_double = 1;
660 else if (!strcmp (p, "-fno-short-double"))
661 flag_short_double = 0;
662 else if (!strcmp (p, "-fasm"))
664 else if (!strcmp (p, "-fno-asm"))
666 else if (!strcmp (p, "-fbuiltin"))
668 else if (!strcmp (p, "-fno-builtin"))
670 else if (!strcmp (p, "-ansi"))
672 else if (!strcmp (p, "-Werror-implicit-function-declaration"))
673 mesg_implicit_function_declaration = 2;
674 else if (!strcmp (p, "-Wimplicit-function-declaration"))
675 mesg_implicit_function_declaration = 1;
676 else if (!strcmp (p, "-Wno-implicit-function-declaration"))
677 mesg_implicit_function_declaration = 0;
678 else if (!strcmp (p, "-Wimplicit-int"))
679 warn_implicit_int = 1;
680 else if (!strcmp (p, "-Wno-implicit-int"))
681 warn_implicit_int = 0;
682 else if (!strcmp (p, "-Wimplicit"))
684 warn_implicit_int = 1;
685 if (mesg_implicit_function_declaration != 2)
686 mesg_implicit_function_declaration = 1;
688 else if (!strcmp (p, "-Wno-implicit"))
689 warn_implicit_int = 0, mesg_implicit_function_declaration = 0;
690 else if (!strcmp (p, "-Wlong-long"))
692 else if (!strcmp (p, "-Wno-long-long"))
694 else if (!strcmp (p, "-Wwrite-strings"))
695 flag_const_strings = 1;
696 else if (!strcmp (p, "-Wno-write-strings"))
697 flag_const_strings = 0;
698 else if (!strcmp (p, "-Wcast-qual"))
700 else if (!strcmp (p, "-Wno-cast-qual"))
702 else if (!strcmp (p, "-Wbad-function-cast"))
703 warn_bad_function_cast = 1;
704 else if (!strcmp (p, "-Wno-bad-function-cast"))
705 warn_bad_function_cast = 0;
706 else if (!strcmp (p, "-Wmissing-noreturn"))
707 warn_missing_noreturn = 1;
708 else if (!strcmp (p, "-Wno-missing-noreturn"))
709 warn_missing_noreturn = 0;
710 else if (!strcmp (p, "-Wmissing-format-attribute"))
711 warn_missing_format_attribute = 1;
712 else if (!strcmp (p, "-Wno-missing-format-attribute"))
713 warn_missing_format_attribute = 0;
714 else if (!strcmp (p, "-Wpointer-arith"))
715 warn_pointer_arith = 1;
716 else if (!strcmp (p, "-Wno-pointer-arith"))
717 warn_pointer_arith = 0;
718 else if (!strcmp (p, "-Wstrict-prototypes"))
719 warn_strict_prototypes = 1;
720 else if (!strcmp (p, "-Wno-strict-prototypes"))
721 warn_strict_prototypes = 0;
722 else if (!strcmp (p, "-Wmissing-prototypes"))
723 warn_missing_prototypes = 1;
724 else if (!strcmp (p, "-Wno-missing-prototypes"))
725 warn_missing_prototypes = 0;
726 else if (!strcmp (p, "-Wmissing-declarations"))
727 warn_missing_declarations = 1;
728 else if (!strcmp (p, "-Wno-missing-declarations"))
729 warn_missing_declarations = 0;
730 else if (!strcmp (p, "-Wredundant-decls"))
731 warn_redundant_decls = 1;
732 else if (!strcmp (p, "-Wno-redundant-decls"))
733 warn_redundant_decls = 0;
734 else if (!strcmp (p, "-Wnested-externs"))
735 warn_nested_externs = 1;
736 else if (!strcmp (p, "-Wno-nested-externs"))
737 warn_nested_externs = 0;
738 else if (!strcmp (p, "-Wtraditional"))
739 warn_traditional = 1;
740 else if (!strcmp (p, "-Wno-traditional"))
741 warn_traditional = 0;
742 else if (!strncmp (p, "-Wformat=", 9))
743 warn_format = atol (p + 9);
744 else if (!strcmp (p, "-Wformat"))
746 else if (!strcmp (p, "-Wno-format"))
748 else if (!strcmp (p, "-Wchar-subscripts"))
749 warn_char_subscripts = 1;
750 else if (!strcmp (p, "-Wno-char-subscripts"))
751 warn_char_subscripts = 0;
752 else if (!strcmp (p, "-Wconversion"))
754 else if (!strcmp (p, "-Wno-conversion"))
756 else if (!strcmp (p, "-Wparentheses"))
757 warn_parentheses = 1;
758 else if (!strcmp (p, "-Wno-parentheses"))
759 warn_parentheses = 0;
760 else if (!strcmp (p, "-Wreturn-type"))
761 warn_return_type = 1;
762 else if (!strcmp (p, "-Wno-return-type"))
763 warn_return_type = 0;
764 else if (!strcmp (p, "-Wsequence-point"))
765 warn_sequence_point = 1;
766 else if (!strcmp (p, "-Wno-sequence-point"))
767 warn_sequence_point = 0;
768 else if (!strcmp (p, "-Wcomment"))
769 ; /* cpp handles this one. */
770 else if (!strcmp (p, "-Wno-comment"))
771 ; /* cpp handles this one. */
772 else if (!strcmp (p, "-Wcomments"))
773 ; /* cpp handles this one. */
774 else if (!strcmp (p, "-Wno-comments"))
775 ; /* cpp handles this one. */
776 else if (!strcmp (p, "-Wtrigraphs"))
777 ; /* cpp handles this one. */
778 else if (!strcmp (p, "-Wno-trigraphs"))
779 ; /* cpp handles this one. */
780 else if (!strcmp (p, "-Wundef"))
781 ; /* cpp handles this one. */
782 else if (!strcmp (p, "-Wno-undef"))
783 ; /* cpp handles this one. */
784 else if (!strcmp (p, "-Wimport"))
785 ; /* cpp handles this one. */
786 else if (!strcmp (p, "-Wno-import"))
787 ; /* cpp handles this one. */
788 else if (!strcmp (p, "-Wmissing-braces"))
789 warn_missing_braces = 1;
790 else if (!strcmp (p, "-Wno-missing-braces"))
791 warn_missing_braces = 0;
792 else if (!strcmp (p, "-Wmain"))
794 else if (!strcmp (p, "-Wno-main"))
796 else if (!strcmp (p, "-Wsign-compare"))
797 warn_sign_compare = 1;
798 else if (!strcmp (p, "-Wno-sign-compare"))
799 warn_sign_compare = 0;
800 else if (!strcmp (p, "-Wfloat-equal"))
801 warn_float_equal = 1;
802 else if (!strcmp (p, "-Wno-float-equal"))
803 warn_float_equal = 0;
804 else if (!strcmp (p, "-Wmultichar"))
806 else if (!strcmp (p, "-Wno-multichar"))
808 else if (!strcmp (p, "-Wunknown-pragmas"))
809 /* Set to greater than 1, so that even unknown pragmas in system
810 headers will be warned about. */
811 warn_unknown_pragmas = 2;
812 else if (!strcmp (p, "-Wno-unknown-pragmas"))
813 warn_unknown_pragmas = 0;
814 else if (!strcmp (p, "-Wall"))
816 /* We save the value of warn_uninitialized, since if they put
817 -Wuninitialized on the command line, we need to generate a
818 warning about not using it without also specifying -O. */
819 if (warn_uninitialized != 1)
820 warn_uninitialized = 2;
821 warn_implicit_int = 1;
822 mesg_implicit_function_declaration = 1;
823 warn_return_type = 1;
827 warn_char_subscripts = 1;
828 warn_parentheses = 1;
829 warn_sequence_point = 1;
830 warn_missing_braces = 1;
831 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
832 it off only if it's not explicit. */
834 /* Only warn about unknown pragmas that are not in system headers. */
835 warn_unknown_pragmas = 1;
838 return strings_processed;
843 /* Hooks for print_node. */
846 print_lang_decl (file, node, indent)
847 FILE *file ATTRIBUTE_UNUSED;
848 tree node ATTRIBUTE_UNUSED;
849 int indent ATTRIBUTE_UNUSED;
854 print_lang_type (file, node, indent)
855 FILE *file ATTRIBUTE_UNUSED;
856 tree node ATTRIBUTE_UNUSED;
857 int indent ATTRIBUTE_UNUSED;
862 print_lang_identifier (file, node, indent)
867 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
868 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
869 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
870 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
871 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
872 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
873 if (C_IS_RESERVED_WORD (node))
875 tree rid = ridpointers[C_RID_CODE (node)];
876 indent_to (file, indent + 4);
877 fprintf (file, "rid ");
878 fprintf (file, HOST_PTR_PRINTF, (void *)rid);
879 fprintf (file, " \"%s\"", IDENTIFIER_POINTER (rid));
883 /* Hook called at end of compilation to assume 1 elt
884 for a top-level tentative array defn that wasn't complete before. */
887 finish_incomplete_decl (decl)
890 if (TREE_CODE (decl) == VAR_DECL)
892 tree type = TREE_TYPE (decl);
893 if (type != error_mark_node
894 && TREE_CODE (type) == ARRAY_TYPE
895 && ! DECL_EXTERNAL (decl)
896 && TYPE_DOMAIN (type) == 0)
898 warning_with_decl (decl, "array `%s' assumed to have one element");
900 complete_array_type (type, NULL_TREE, 1);
902 layout_decl (decl, 0);
907 /* Create a new `struct binding_level'. */
909 static struct binding_level *
910 make_binding_level ()
913 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
916 /* Nonzero if we are currently in the global binding level. */
921 return current_binding_level == global_binding_level;
927 keep_next_level_flag = 1;
930 /* Nonzero if the current level needs to have a BLOCK made. */
935 return ((current_binding_level->keep_if_subblocks
936 && current_binding_level->blocks != 0)
937 || current_binding_level->keep
938 || current_binding_level->names != 0
939 || (current_binding_level->tags != 0
940 && !current_binding_level->tag_transparent));
943 /* Identify this binding level as a level of parameters.
944 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
945 But it turns out there is no way to pass the right value for
946 DEFINITION_FLAG, so we ignore it. */
949 declare_parm_level (definition_flag)
950 int definition_flag ATTRIBUTE_UNUSED;
952 current_binding_level->parm_flag = 1;
955 /* Nonzero if currently making parm declarations. */
960 return current_binding_level->parm_flag;
963 /* Enter a new binding level.
964 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
965 not for that of tags. */
968 pushlevel (tag_transparent)
971 register struct binding_level *newlevel = NULL_BINDING_LEVEL;
973 /* If this is the top level of a function,
974 just make sure that NAMED_LABELS is 0. */
976 if (current_binding_level == global_binding_level)
981 /* Reuse or create a struct for this binding level. */
983 if (free_binding_level)
985 newlevel = free_binding_level;
986 free_binding_level = free_binding_level->level_chain;
990 newlevel = make_binding_level ();
993 /* Add this level to the front of the chain (stack) of levels that
996 *newlevel = clear_binding_level;
997 newlevel->tag_transparent
999 || (current_binding_level
1000 ? current_binding_level->subblocks_tag_transparent
1002 newlevel->level_chain = current_binding_level;
1003 current_binding_level = newlevel;
1004 newlevel->keep = keep_next_level_flag;
1005 keep_next_level_flag = 0;
1006 newlevel->keep_if_subblocks = keep_next_if_subblocks;
1007 keep_next_if_subblocks = 0;
1010 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
1013 clear_limbo_values (block)
1018 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
1019 if (DECL_NAME (tem) != 0)
1020 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
1022 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
1023 clear_limbo_values (tem);
1026 /* Exit a binding level.
1027 Pop the level off, and restore the state of the identifier-decl mappings
1028 that were in effect when this level was entered.
1030 If KEEP is nonzero, this level had explicit declarations, so
1031 and create a "block" (a BLOCK node) for the level
1032 to record its declarations and subblocks for symbol table output.
1034 If FUNCTIONBODY is nonzero, this level is the body of a function,
1035 so create a block as if KEEP were set and also clear out all
1038 If REVERSE is nonzero, reverse the order of decls before putting
1039 them into the BLOCK. */
1042 poplevel (keep, reverse, functionbody)
1048 /* The chain of decls was accumulated in reverse order.
1049 Put it into forward order, just for cleanliness. */
1051 tree tags = current_binding_level->tags;
1052 tree subblocks = current_binding_level->blocks;
1055 int block_previously_created;
1057 keep |= current_binding_level->keep;
1059 /* This warning is turned off because it causes warnings for
1060 declarations like `extern struct foo *x'. */
1062 /* Warn about incomplete structure types in this level. */
1063 for (link = tags; link; link = TREE_CHAIN (link))
1064 if (!COMPLETE_TYPE_P (TREE_VALUE (link)))
1066 tree type = TREE_VALUE (link);
1067 tree type_name = TYPE_NAME (type);
1068 char *id = IDENTIFIER_POINTER (TREE_CODE (type_name) == IDENTIFIER_NODE
1070 : DECL_NAME (type_name));
1071 switch (TREE_CODE (type))
1074 error ("`struct %s' incomplete in scope ending here", id);
1077 error ("`union %s' incomplete in scope ending here", id);
1080 error ("`enum %s' incomplete in scope ending here", id);
1086 /* Get the decls in the order they were written.
1087 Usually current_binding_level->names is in reverse order.
1088 But parameter decls were previously put in forward order. */
1091 current_binding_level->names
1092 = decls = nreverse (current_binding_level->names);
1094 decls = current_binding_level->names;
1096 /* Output any nested inline functions within this block
1097 if they weren't already output. */
1099 for (decl = decls; decl; decl = TREE_CHAIN (decl))
1100 if (TREE_CODE (decl) == FUNCTION_DECL
1101 && ! TREE_ASM_WRITTEN (decl)
1102 && DECL_INITIAL (decl) != 0
1103 && TREE_ADDRESSABLE (decl))
1105 /* If this decl was copied from a file-scope decl
1106 on account of a block-scope extern decl,
1107 propagate TREE_ADDRESSABLE to the file-scope decl.
1109 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1110 true, since then the decl goes through save_for_inline_copying. */
1111 if (DECL_ABSTRACT_ORIGIN (decl) != 0
1112 && DECL_ABSTRACT_ORIGIN (decl) != decl)
1113 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
1116 /* We used to warn about unused variables in expand_end_bindings,
1117 i.e. while generating RTL. But in function-at-a-time mode we may
1118 choose to never expand a function at all (e.g. auto inlining), so
1119 we do this explicitly now. */
1120 warn_about_unused_variables (getdecls ());
1122 /* If there were any declarations or structure tags in that level,
1123 or if this level is a function body,
1124 create a BLOCK to record them for the life of this function. */
1127 block_previously_created = (current_binding_level->this_block != 0);
1128 if (block_previously_created)
1129 block = current_binding_level->this_block;
1130 else if (keep || functionbody
1131 || (current_binding_level->keep_if_subblocks && subblocks != 0))
1132 block = make_node (BLOCK);
1135 BLOCK_VARS (block) = decls;
1136 BLOCK_SUBBLOCKS (block) = subblocks;
1139 /* In each subblock, record that this is its superior. */
1141 for (link = subblocks; link; link = TREE_CHAIN (link))
1142 BLOCK_SUPERCONTEXT (link) = block;
1144 /* Clear out the meanings of the local variables of this level. */
1146 for (link = decls; link; link = TREE_CHAIN (link))
1148 if (DECL_NAME (link) != 0)
1150 /* If the ident. was used or addressed via a local extern decl,
1151 don't forget that fact. */
1152 if (DECL_EXTERNAL (link))
1154 if (TREE_USED (link))
1155 TREE_USED (DECL_NAME (link)) = 1;
1156 if (TREE_ADDRESSABLE (link))
1157 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1159 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1163 /* Restore all name-meanings of the outer levels
1164 that were shadowed by this level. */
1166 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1167 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1169 /* If the level being exited is the top level of a function,
1170 check over all the labels, and clear out the current
1171 (function local) meanings of their names. */
1175 clear_limbo_values (block);
1177 /* If this is the top level block of a function,
1178 the vars are the function's parameters.
1179 Don't leave them in the BLOCK because they are
1180 found in the FUNCTION_DECL instead. */
1182 BLOCK_VARS (block) = 0;
1184 /* Clear out the definitions of all label names,
1185 since their scopes end here,
1186 and add them to BLOCK_VARS. */
1188 for (link = named_labels; link; link = TREE_CHAIN (link))
1190 register tree label = TREE_VALUE (link);
1192 if (DECL_INITIAL (label) == 0)
1194 error_with_decl (label, "label `%s' used but not defined");
1195 /* Avoid crashing later. */
1196 define_label (input_filename, lineno,
1199 else if (warn_unused_label && !TREE_USED (label))
1200 warning_with_decl (label, "label `%s' defined but not used");
1201 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1203 /* Put the labels into the "variables" of the
1204 top-level block, so debugger can see them. */
1205 TREE_CHAIN (label) = BLOCK_VARS (block);
1206 BLOCK_VARS (block) = label;
1210 /* Pop the current level, and free the structure for reuse. */
1213 register struct binding_level *level = current_binding_level;
1214 current_binding_level = current_binding_level->level_chain;
1216 level->level_chain = free_binding_level;
1217 free_binding_level = level;
1220 /* Dispose of the block that we just made inside some higher level. */
1222 DECL_INITIAL (current_function_decl) = block;
1225 if (!block_previously_created)
1226 current_binding_level->blocks
1227 = chainon (current_binding_level->blocks, block);
1229 /* If we did not make a block for the level just exited,
1230 any blocks made for inner levels
1231 (since they cannot be recorded as subblocks in that level)
1232 must be carried forward so they will later become subblocks
1233 of something else. */
1235 current_binding_level->blocks
1236 = chainon (current_binding_level->blocks, subblocks);
1238 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1239 binding contour so that they point to the appropriate construct, i.e.
1240 either to the current FUNCTION_DECL node, or else to the BLOCK node
1241 we just constructed.
1243 Note that for tagged types whose scope is just the formal parameter
1244 list for some function type specification, we can't properly set
1245 their TYPE_CONTEXTs here, because we don't have a pointer to the
1246 appropriate FUNCTION_TYPE node readily available to us. For those
1247 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1248 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1249 node which will represent the "scope" for these "parameter list local"
1253 for (link = tags; link; link = TREE_CHAIN (link))
1254 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1256 for (link = tags; link; link = TREE_CHAIN (link))
1257 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1260 TREE_USED (block) = 1;
1265 /* Delete the node BLOCK from the current binding level.
1266 This is used for the block inside a stmt expr ({...})
1267 so that the block can be reinserted where appropriate. */
1270 delete_block (block)
1274 if (current_binding_level->blocks == block)
1275 current_binding_level->blocks = TREE_CHAIN (block);
1276 for (t = current_binding_level->blocks; t;)
1278 if (TREE_CHAIN (t) == block)
1279 TREE_CHAIN (t) = TREE_CHAIN (block);
1283 TREE_CHAIN (block) = NULL;
1284 /* Clear TREE_USED which is always set by poplevel.
1285 The flag is set again if insert_block is called. */
1286 TREE_USED (block) = 0;
1289 /* Insert BLOCK at the end of the list of subblocks of the
1290 current binding level. This is used when a BIND_EXPR is expanded,
1291 to handle the BLOCK node inside the BIND_EXPR. */
1294 insert_block (block)
1297 TREE_USED (block) = 1;
1298 current_binding_level->blocks
1299 = chainon (current_binding_level->blocks, block);
1302 /* Set the BLOCK node for the innermost scope
1303 (the one we are currently in). */
1307 register tree block;
1309 current_binding_level->this_block = block;
1315 register struct binding_level *newlevel;
1317 /* Reuse or create a struct for this binding level. */
1319 if (free_binding_level)
1321 newlevel = free_binding_level;
1322 free_binding_level = free_binding_level->level_chain;
1326 newlevel = make_binding_level ();
1329 /* Add this level to the front of the chain (stack) of label levels. */
1331 newlevel->level_chain = label_level_chain;
1332 label_level_chain = newlevel;
1334 newlevel->names = named_labels;
1335 newlevel->shadowed = shadowed_labels;
1337 shadowed_labels = 0;
1343 register struct binding_level *level = label_level_chain;
1346 /* Clear out the definitions of the declared labels in this level.
1347 Leave in the list any ordinary, non-declared labels. */
1348 for (link = named_labels, prev = 0; link;)
1350 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1352 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1354 error_with_decl (TREE_VALUE (link),
1355 "label `%s' used but not defined");
1356 /* Avoid crashing later. */
1357 define_label (input_filename, lineno,
1358 DECL_NAME (TREE_VALUE (link)));
1360 else if (warn_unused_label && !TREE_USED (TREE_VALUE (link)))
1361 warning_with_decl (TREE_VALUE (link),
1362 "label `%s' defined but not used");
1363 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1365 /* Delete this element from the list. */
1366 link = TREE_CHAIN (link);
1368 TREE_CHAIN (prev) = link;
1370 named_labels = link;
1375 link = TREE_CHAIN (link);
1379 /* Bring back all the labels that were shadowed. */
1380 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1381 if (DECL_NAME (TREE_VALUE (link)) != 0)
1382 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1383 = TREE_VALUE (link);
1385 named_labels = chainon (named_labels, level->names);
1386 shadowed_labels = level->shadowed;
1388 /* Pop the current level, and free the structure for reuse. */
1389 label_level_chain = label_level_chain->level_chain;
1390 level->level_chain = free_binding_level;
1391 free_binding_level = level;
1394 /* Push a definition or a declaration of struct, union or enum tag "name".
1395 "type" should be the type node.
1396 We assume that the tag "name" is not already defined.
1398 Note that the definition may really be just a forward reference.
1399 In that case, the TYPE_SIZE will be zero. */
1402 pushtag (name, type)
1405 register struct binding_level *b;
1407 /* Find the proper binding level for this type tag. */
1409 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1414 /* Record the identifier as the type's name if it has none. */
1416 if (TYPE_NAME (type) == 0)
1417 TYPE_NAME (type) = name;
1420 b->tags = tree_cons (name, type, b->tags);
1422 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1423 tagged type we just added to the current binding level. This fake
1424 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1425 to output a representation of a tagged type, and it also gives
1426 us a convenient place to record the "scope start" address for the
1429 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1431 /* An approximation for now, so we can tell this is a function-scope tag.
1432 This will be updated in poplevel. */
1433 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1436 /* Handle when a new declaration NEWDECL
1437 has the same name as an old one OLDDECL
1438 in the same binding contour.
1439 Prints an error message if appropriate.
1441 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1442 Otherwise, return 0.
1444 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1445 and OLDDECL is in an outer binding level and should thus not be changed. */
1448 duplicate_decls (newdecl, olddecl, different_binding_level)
1449 register tree newdecl, olddecl;
1450 int different_binding_level;
1452 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1453 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1454 && DECL_INITIAL (newdecl) != 0);
1455 tree oldtype = TREE_TYPE (olddecl);
1456 tree newtype = TREE_TYPE (newdecl);
1459 if (DECL_P (olddecl))
1460 DECL_MACHINE_ATTRIBUTES (newdecl)
1461 = merge_machine_decl_attributes (olddecl, newdecl);
1463 if (TREE_CODE (newtype) == ERROR_MARK
1464 || TREE_CODE (oldtype) == ERROR_MARK)
1467 /* New decl is completely inconsistent with the old one =>
1468 tell caller to replace the old one.
1469 This is always an error except in the case of shadowing a builtin. */
1470 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1472 if (TREE_CODE (olddecl) == FUNCTION_DECL
1473 && (DECL_BUILT_IN (olddecl)
1474 || DECL_BUILT_IN_NONANSI (olddecl)))
1476 /* If you declare a built-in or predefined function name as static,
1477 the old definition is overridden,
1478 but optionally warn this was a bad choice of name. */
1479 if (!TREE_PUBLIC (newdecl))
1483 else if (DECL_BUILT_IN (olddecl))
1484 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1486 warning_with_decl (newdecl, "shadowing library function `%s'");
1488 /* Likewise, if the built-in is not ansi, then programs can
1489 override it even globally without an error. */
1490 else if (! DECL_BUILT_IN (olddecl))
1491 warning_with_decl (newdecl,
1492 "library function `%s' declared as non-function");
1494 else if (DECL_BUILT_IN_NONANSI (olddecl))
1495 warning_with_decl (newdecl,
1496 "built-in function `%s' declared as non-function");
1498 warning_with_decl (newdecl,
1499 "built-in function `%s' declared as non-function");
1503 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1504 error_with_decl (olddecl, "previous declaration of `%s'");
1510 /* For real parm decl following a forward decl,
1511 return 1 so old decl will be reused. */
1512 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1513 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1516 /* The new declaration is the same kind of object as the old one.
1517 The declarations may partially match. Print warnings if they don't
1518 match enough. Ultimately, copy most of the information from the new
1519 decl to the old one, and keep using the old one. */
1521 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1522 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1523 && DECL_INITIAL (olddecl) == 0)
1524 /* If -traditional, avoid error for redeclaring fcn
1525 after implicit decl. */
1527 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1528 && DECL_BUILT_IN (olddecl))
1530 /* A function declaration for a built-in function. */
1531 if (!TREE_PUBLIC (newdecl))
1533 /* If you declare a built-in function name as static, the
1534 built-in definition is overridden,
1535 but optionally warn this was a bad choice of name. */
1537 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1538 /* Discard the old built-in function. */
1541 else if (!types_match)
1543 /* Accept the return type of the new declaration if same modes. */
1544 tree oldreturntype = TREE_TYPE (oldtype);
1545 tree newreturntype = TREE_TYPE (newtype);
1547 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1549 /* Function types may be shared, so we can't just modify
1550 the return type of olddecl's function type. */
1552 = build_function_type (newreturntype,
1553 TYPE_ARG_TYPES (oldtype));
1555 types_match = comptypes (newtype, trytype);
1559 /* Accept harmless mismatch in first argument type also.
1561 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1562 && TYPE_ARG_TYPES (oldtype) != 0
1563 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1564 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1565 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1566 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1568 /* Function types may be shared, so we can't just modify
1569 the return type of olddecl's function type. */
1571 = build_function_type (TREE_TYPE (oldtype),
1572 tree_cons (NULL_TREE,
1573 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1574 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1576 types_match = comptypes (newtype, trytype);
1580 if (! different_binding_level)
1581 TREE_TYPE (olddecl) = oldtype;
1585 /* If types don't match for a built-in, throw away the built-in. */
1586 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1590 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1591 && DECL_SOURCE_LINE (olddecl) == 0)
1593 /* A function declaration for a predeclared function
1594 that isn't actually built in. */
1595 if (!TREE_PUBLIC (newdecl))
1597 /* If you declare it as static, the
1598 default definition is overridden. */
1601 else if (!types_match)
1603 /* If the types don't match, preserve volatility indication.
1604 Later on, we will discard everything else about the
1605 default declaration. */
1606 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1609 /* Permit char *foo () to match void *foo (...) if not pedantic,
1610 if one of them came from a system header file. */
1611 else if (!types_match
1612 && TREE_CODE (olddecl) == FUNCTION_DECL
1613 && TREE_CODE (newdecl) == FUNCTION_DECL
1614 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1615 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1616 && (DECL_IN_SYSTEM_HEADER (olddecl)
1617 || DECL_IN_SYSTEM_HEADER (newdecl))
1618 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1619 && TYPE_ARG_TYPES (oldtype) == 0
1620 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1621 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1623 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1624 && TYPE_ARG_TYPES (newtype) == 0
1625 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1626 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1629 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1630 /* Make sure we keep void * as ret type, not char *. */
1631 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1632 TREE_TYPE (newdecl) = newtype = oldtype;
1634 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1635 we will come back here again. */
1636 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1638 else if (!types_match
1639 /* Permit char *foo (int, ...); followed by char *foo ();
1641 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1643 /* Return types must still match. */
1644 && comptypes (TREE_TYPE (oldtype),
1645 TREE_TYPE (newtype))
1646 && TYPE_ARG_TYPES (newtype) == 0))
1648 error_with_decl (newdecl, "conflicting types for `%s'");
1649 /* Check for function type mismatch
1650 involving an empty arglist vs a nonempty one. */
1651 if (TREE_CODE (olddecl) == FUNCTION_DECL
1652 && comptypes (TREE_TYPE (oldtype),
1653 TREE_TYPE (newtype))
1654 && ((TYPE_ARG_TYPES (oldtype) == 0
1655 && DECL_INITIAL (olddecl) == 0)
1657 (TYPE_ARG_TYPES (newtype) == 0
1658 && DECL_INITIAL (newdecl) == 0)))
1660 /* Classify the problem further. */
1661 register tree t = TYPE_ARG_TYPES (oldtype);
1663 t = TYPE_ARG_TYPES (newtype);
1664 for (; t; t = TREE_CHAIN (t))
1666 register tree type = TREE_VALUE (t);
1668 if (TREE_CHAIN (t) == 0
1669 && TYPE_MAIN_VARIANT (type) != void_type_node)
1671 error ("A parameter list with an ellipsis can't match an empty parameter name list declaration.");
1675 if (simple_type_promotes_to (type) != NULL_TREE)
1677 error ("An argument type that has a default promotion can't match an empty parameter name list declaration.");
1682 error_with_decl (olddecl, "previous declaration of `%s'");
1686 errmsg = redeclaration_error_message (newdecl, olddecl);
1692 error_with_decl (newdecl, "redefinition of `%s'");
1695 error_with_decl (newdecl, "redeclaration of `%s'");
1698 error_with_decl (newdecl, "conflicting declarations of `%s'");
1704 error_with_decl (olddecl,
1705 ((DECL_INITIAL (olddecl)
1706 && current_binding_level == global_binding_level)
1707 ? "`%s' previously defined here"
1708 : "`%s' previously declared here"));
1710 else if (TREE_CODE (newdecl) == TYPE_DECL
1711 && (DECL_IN_SYSTEM_HEADER (olddecl)
1712 || DECL_IN_SYSTEM_HEADER (newdecl)))
1714 warning_with_decl (newdecl, "redefinition of `%s'");
1717 ((DECL_INITIAL (olddecl)
1718 && current_binding_level == global_binding_level)
1719 ? "`%s' previously defined here"
1720 : "`%s' previously declared here"));
1722 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1723 && DECL_INITIAL (olddecl) != 0
1724 && TYPE_ARG_TYPES (oldtype) == 0
1725 && TYPE_ARG_TYPES (newtype) != 0
1726 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1728 register tree type, parm;
1730 /* Prototype decl follows defn w/o prototype. */
1732 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1733 type = TYPE_ARG_TYPES (newtype),
1736 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1738 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1739 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1741 warning_with_decl (newdecl, "prototype for `%s' follows");
1742 warning_with_decl (olddecl, "non-prototype definition here");
1745 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1746 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1748 error_with_decl (newdecl,
1749 "prototype for `%s' follows and number of arguments doesn't match");
1750 error_with_decl (olddecl, "non-prototype definition here");
1754 /* Type for passing arg must be consistent
1755 with that declared for the arg. */
1756 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1757 /* If -traditional, allow `unsigned int' instead of `int'
1758 in the prototype. */
1759 && (! (flag_traditional
1760 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1761 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1763 error_with_decl (newdecl,
1764 "prototype for `%s' follows and argument %d doesn't match",
1766 error_with_decl (olddecl, "non-prototype definition here");
1772 /* Warn about mismatches in various flags. */
1775 /* Warn if function is now inline
1776 but was previously declared not inline and has been called. */
1777 if (TREE_CODE (olddecl) == FUNCTION_DECL
1778 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1779 && TREE_USED (olddecl))
1780 warning_with_decl (newdecl,
1781 "`%s' declared inline after being called");
1782 if (TREE_CODE (olddecl) == FUNCTION_DECL
1783 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1784 && DECL_INITIAL (olddecl) != 0)
1785 warning_with_decl (newdecl,
1786 "`%s' declared inline after its definition");
1788 /* If pedantic, warn when static declaration follows a non-static
1789 declaration. Otherwise, do so only for functions. */
1790 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1791 && TREE_PUBLIC (olddecl)
1792 && !TREE_PUBLIC (newdecl))
1793 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1795 /* If warn_traditional, warn when a non-static function
1796 declaration follows a static one. */
1797 if (warn_traditional && !in_system_header
1798 && TREE_CODE (olddecl) == FUNCTION_DECL
1799 && !TREE_PUBLIC (olddecl)
1800 && TREE_PUBLIC (newdecl))
1801 warning_with_decl (newdecl, "non-static declaration for `%s' follows static");
1803 /* Warn when const declaration follows a non-const
1804 declaration, but not for functions. */
1805 if (TREE_CODE (olddecl) != FUNCTION_DECL
1806 && !TREE_READONLY (olddecl)
1807 && TREE_READONLY (newdecl))
1808 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1809 /* These bits are logically part of the type, for variables.
1810 But not for functions
1811 (where qualifiers are not valid ANSI anyway). */
1812 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1813 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1814 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1815 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1819 /* Optionally warn about more than one declaration for the same name. */
1820 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1821 /* Don't warn about a function declaration
1822 followed by a definition. */
1823 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1824 && DECL_INITIAL (olddecl) == 0)
1825 /* Don't warn about extern decl followed by (tentative) definition. */
1826 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1828 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1829 warning_with_decl (olddecl, "previous declaration of `%s'");
1832 /* Copy all the DECL_... slots specified in the new decl
1833 except for any that we copy here from the old type.
1835 Past this point, we don't change OLDTYPE and NEWTYPE
1836 even if we change the types of NEWDECL and OLDDECL. */
1840 /* When copying info to olddecl, we store into write_olddecl
1841 instead. This allows us to avoid modifying olddecl when
1842 different_binding_level is true. */
1843 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1845 /* Merge the data types specified in the two decls. */
1846 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1848 if (different_binding_level)
1850 = build_type_attribute_variant
1852 merge_attributes (TYPE_ATTRIBUTES (newtype),
1853 TYPE_ATTRIBUTES (oldtype)));
1856 = TREE_TYPE (olddecl)
1857 = common_type (newtype, oldtype);
1860 /* Lay the type out, unless already done. */
1861 if (oldtype != TREE_TYPE (newdecl))
1863 if (TREE_TYPE (newdecl) != error_mark_node)
1864 layout_type (TREE_TYPE (newdecl));
1865 if (TREE_CODE (newdecl) != FUNCTION_DECL
1866 && TREE_CODE (newdecl) != TYPE_DECL
1867 && TREE_CODE (newdecl) != CONST_DECL)
1868 layout_decl (newdecl, 0);
1872 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1873 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1874 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1875 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1876 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1877 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1879 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1880 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1884 /* Keep the old rtl since we can safely use it. */
1885 DECL_RTL (newdecl) = DECL_RTL (olddecl);
1887 /* Merge the type qualifiers. */
1888 if (TREE_CODE (olddecl) == FUNCTION_DECL
1889 && DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1890 && ! TREE_THIS_VOLATILE (newdecl))
1891 TREE_THIS_VOLATILE (write_olddecl) = 0;
1893 if (TREE_READONLY (newdecl))
1894 TREE_READONLY (write_olddecl) = 1;
1896 if (TREE_THIS_VOLATILE (newdecl))
1898 TREE_THIS_VOLATILE (write_olddecl) = 1;
1899 if (TREE_CODE (newdecl) == VAR_DECL
1900 /* If an automatic variable is re-declared in the same
1901 function scope, but the old declaration was not
1902 volatile, make_var_volatile() would crash because the
1903 variable would have been assigned to a pseudo, not a
1904 MEM. Since this duplicate declaration is invalid
1905 anyway, we just skip the call. */
1907 make_var_volatile (newdecl);
1910 /* Keep source location of definition rather than declaration. */
1911 /* When called with different_binding_level set, keep the old
1912 information so that meaningful diagnostics can be given. */
1913 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1914 && ! different_binding_level)
1916 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1917 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1920 /* Merge the unused-warning information. */
1921 if (DECL_IN_SYSTEM_HEADER (olddecl))
1922 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1923 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1924 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1926 /* Merge the initialization information. */
1927 /* When called with different_binding_level set, don't copy over
1928 DECL_INITIAL, so that we don't accidentally change function
1929 declarations into function definitions. */
1930 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1931 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1933 /* Merge the section attribute.
1934 We want to issue an error if the sections conflict but that must be
1935 done later in decl_attributes since we are called before attributes
1937 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1938 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1940 /* Copy the assembler name.
1941 Currently, it can only be defined in the prototype. */
1942 DECL_ASSEMBLER_NAME (newdecl) = DECL_ASSEMBLER_NAME (olddecl);
1944 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1946 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1947 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1949 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1950 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1951 DECL_NO_CHECK_MEMORY_USAGE (newdecl)
1952 |= DECL_NO_CHECK_MEMORY_USAGE (olddecl);
1953 DECL_NO_LIMIT_STACK (newdecl)
1954 |= DECL_NO_LIMIT_STACK (olddecl);
1957 /* If cannot merge, then use the new type and qualifiers,
1958 and don't preserve the old rtl. */
1959 else if (! different_binding_level)
1961 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1962 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1963 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1964 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1967 /* Merge the storage class information. */
1968 DECL_WEAK (newdecl) |= DECL_WEAK (olddecl);
1969 /* For functions, static overrides non-static. */
1970 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1972 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1973 /* This is since we don't automatically
1974 copy the attributes of NEWDECL into OLDDECL. */
1975 /* No need to worry about different_binding_level here because
1976 then TREE_PUBLIC (newdecl) was true. */
1977 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1978 /* If this clears `static', clear it in the identifier too. */
1979 if (! TREE_PUBLIC (olddecl))
1980 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1982 if (DECL_EXTERNAL (newdecl))
1984 if (! different_binding_level)
1986 /* Don't mess with these flags on local externs; they remain
1987 external even if there's a declaration at file scope which
1989 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1990 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1992 /* An extern decl does not override previous storage class. */
1993 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1994 if (! DECL_EXTERNAL (newdecl))
1995 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1999 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
2000 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
2003 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2005 /* If either decl says `inline', this fn is inline,
2006 unless its definition was passed already. */
2007 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
2008 DECL_INLINE (olddecl) = 1;
2010 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
2012 if (DECL_BUILT_IN (olddecl))
2014 /* Get rid of any built-in function if new arg types don't match it
2015 or if we have a function definition. */
2016 if (! types_match || new_is_definition)
2018 if (! different_binding_level)
2020 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
2021 DECL_BUILT_IN_CLASS (olddecl) = NOT_BUILT_IN;
2026 /* If redeclaring a builtin function, and not a definition,
2027 it stays built in. */
2028 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2029 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2032 /* Also preserve various other info from the definition. */
2033 else if (! new_is_definition)
2034 DECL_FRAME_SIZE (newdecl) = DECL_FRAME_SIZE (olddecl);
2035 if (! new_is_definition)
2037 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2038 /* When called with different_binding_level set, don't copy over
2039 DECL_INITIAL, so that we don't accidentally change function
2040 declarations into function definitions. */
2041 if (! different_binding_level)
2042 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2043 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
2044 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2045 if (DECL_INLINE (newdecl))
2046 DECL_ABSTRACT_ORIGIN (newdecl) = DECL_ABSTRACT_ORIGIN (olddecl);
2049 if (different_binding_level)
2052 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2053 But preserve OLDDECL's DECL_UID. */
2055 register unsigned olddecl_uid = DECL_UID (olddecl);
2057 bcopy ((char *) newdecl + sizeof (struct tree_common),
2058 (char *) olddecl + sizeof (struct tree_common),
2059 sizeof (struct tree_decl) - sizeof (struct tree_common));
2060 DECL_UID (olddecl) = olddecl_uid;
2063 /* NEWDECL contains the merged attribute lists.
2064 Update OLDDECL to be the same. */
2065 DECL_MACHINE_ATTRIBUTES (olddecl) = DECL_MACHINE_ATTRIBUTES (newdecl);
2070 /* Record a decl-node X as belonging to the current lexical scope.
2071 Check for errors (such as an incompatible declaration for the same
2072 name already seen in the same scope).
2074 Returns either X or an old decl for the same name.
2075 If an old decl is returned, it may have been smashed
2076 to agree with what X says. */
2083 register tree name = DECL_NAME (x);
2084 register struct binding_level *b = current_binding_level;
2086 DECL_CONTEXT (x) = current_function_decl;
2087 /* A local extern declaration for a function doesn't constitute nesting.
2088 A local auto declaration does, since it's a forward decl
2089 for a nested function coming later. */
2090 if ((TREE_CODE (x) == FUNCTION_DECL || TREE_CODE (x) == VAR_DECL)
2091 && DECL_INITIAL (x) == 0 && DECL_EXTERNAL (x))
2092 DECL_CONTEXT (x) = 0;
2094 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
2095 && x != IDENTIFIER_IMPLICIT_DECL (name)
2096 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
2097 && !DECL_IN_SYSTEM_HEADER (x))
2098 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
2104 int different_binding_level = 0;
2106 t = lookup_name_current_level (name);
2107 /* Don't type check externs here when -traditional. This is so that
2108 code with conflicting declarations inside blocks will get warnings
2109 not errors. X11 for instance depends on this. */
2110 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
2112 t = IDENTIFIER_GLOBAL_VALUE (name);
2113 /* Type decls at global scope don't conflict with externs declared
2114 inside lexical blocks. */
2115 if (t && TREE_CODE (t) == TYPE_DECL)
2117 different_binding_level = 1;
2119 if (t != 0 && t == error_mark_node)
2120 /* error_mark_node is 0 for a while during initialization! */
2123 error_with_decl (x, "`%s' used prior to declaration");
2128 file = DECL_SOURCE_FILE (t);
2129 line = DECL_SOURCE_LINE (t);
2132 /* If this decl is `static' and an implicit decl was seen previously,
2133 warn. But don't complain if -traditional,
2134 since traditional compilers don't complain. */
2135 if (! flag_traditional && TREE_PUBLIC (name)
2136 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2137 sets this for all functions. */
2138 && ! TREE_PUBLIC (x)
2139 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2140 /* We used to warn also for explicit extern followed by static,
2141 but sometimes you need to do it that way. */
2142 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2144 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2145 IDENTIFIER_POINTER (name));
2146 pedwarn_with_file_and_line
2147 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2148 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2149 "previous declaration of `%s'",
2150 IDENTIFIER_POINTER (name));
2151 TREE_THIS_VOLATILE (name) = 1;
2154 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2156 if (TREE_CODE (t) == PARM_DECL)
2158 /* Don't allow more than one "real" duplicate
2159 of a forward parm decl. */
2160 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2166 /* If we are processing a typedef statement, generate a whole new
2167 ..._TYPE node (which will be just an variant of the existing
2168 ..._TYPE node with identical properties) and then install the
2169 TYPE_DECL node generated to represent the typedef name as the
2170 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2172 The whole point here is to end up with a situation where each
2173 and every ..._TYPE node the compiler creates will be uniquely
2174 associated with AT MOST one node representing a typedef name.
2175 This way, even though the compiler substitutes corresponding
2176 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2177 early on, later parts of the compiler can always do the reverse
2178 translation and get back the corresponding typedef name. For
2181 typedef struct S MY_TYPE;
2184 Later parts of the compiler might only know that `object' was of
2185 type `struct S' if it were not for code just below. With this
2186 code however, later parts of the compiler see something like:
2188 struct S' == struct S
2189 typedef struct S' MY_TYPE;
2192 And they can then deduce (from the node for type struct S') that
2193 the original object declaration was:
2197 Being able to do this is important for proper support of protoize,
2198 and also for generating precise symbolic debugging information
2199 which takes full account of the programmer's (typedef) vocabulary.
2201 Obviously, we don't want to generate a duplicate ..._TYPE node if
2202 the TYPE_DECL node that we are now processing really represents a
2203 standard built-in type.
2205 Since all standard types are effectively declared at line zero
2206 in the source file, we can easily check to see if we are working
2207 on a standard type by checking the current value of lineno. */
2209 if (TREE_CODE (x) == TYPE_DECL)
2211 if (DECL_SOURCE_LINE (x) == 0)
2213 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2214 TYPE_NAME (TREE_TYPE (x)) = x;
2216 else if (TREE_TYPE (x) != error_mark_node
2217 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2219 tree tt = TREE_TYPE (x);
2220 DECL_ORIGINAL_TYPE (x) = tt;
2221 tt = build_type_copy (tt);
2223 TREE_USED (tt) = TREE_USED (x);
2228 /* Multiple external decls of the same identifier ought to match.
2229 Check against both global declarations (when traditional) and out of
2230 scope (limbo) block level declarations.
2232 We get warnings about inline functions where they are defined.
2233 Avoid duplicate warnings where they are used. */
2235 && ! (TREE_CODE (x) == FUNCTION_DECL && DECL_INLINE (x)))
2239 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2240 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2241 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2242 decl = IDENTIFIER_GLOBAL_VALUE (name);
2243 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2244 /* Decls in limbo are always extern, so no need to check that. */
2245 decl = IDENTIFIER_LIMBO_VALUE (name);
2249 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2250 /* If old decl is built-in, we already warned if we should. */
2251 && !DECL_BUILT_IN (decl))
2253 pedwarn_with_decl (x,
2254 "type mismatch with previous external decl");
2255 pedwarn_with_decl (decl, "previous external decl of `%s'");
2259 /* If a function has had an implicit declaration, and then is defined,
2260 make sure they are compatible. */
2262 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2263 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2264 && TREE_CODE (x) == FUNCTION_DECL
2265 && ! comptypes (TREE_TYPE (x),
2266 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2268 warning_with_decl (x, "type mismatch with previous implicit declaration");
2269 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2270 "previous implicit declaration of `%s'");
2273 /* In PCC-compatibility mode, extern decls of vars with no current decl
2274 take effect at top level no matter where they are. */
2275 if (flag_traditional && DECL_EXTERNAL (x)
2276 && lookup_name (name) == 0)
2278 tree type = TREE_TYPE (x);
2280 /* But don't do this if the type contains temporary nodes. */
2283 if (type == error_mark_node)
2285 if (TYPE_CONTEXT (type))
2287 warning_with_decl (x, "type of external `%s' is not global");
2288 /* By exiting the loop early, we leave TYPE nonzero,
2289 and thus prevent globalization of the decl. */
2292 else if (TREE_CODE (type) == FUNCTION_TYPE
2293 && TYPE_ARG_TYPES (type) != 0)
2294 /* The types might not be truly local,
2295 but the list of arg types certainly is temporary.
2296 Since prototypes are nontraditional,
2297 ok not to do the traditional thing. */
2299 type = TREE_TYPE (type);
2303 b = global_binding_level;
2306 /* This name is new in its binding level.
2307 Install the new declaration and return it. */
2308 if (b == global_binding_level)
2310 /* Install a global value. */
2312 /* If the first global decl has external linkage,
2313 warn if we later see static one. */
2314 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2315 TREE_PUBLIC (name) = 1;
2317 IDENTIFIER_GLOBAL_VALUE (name) = x;
2319 /* We no longer care about any previous block level declarations. */
2320 IDENTIFIER_LIMBO_VALUE (name) = 0;
2322 /* Don't forget if the function was used via an implicit decl. */
2323 if (IDENTIFIER_IMPLICIT_DECL (name)
2324 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2325 TREE_USED (x) = 1, TREE_USED (name) = 1;
2327 /* Don't forget if its address was taken in that way. */
2328 if (IDENTIFIER_IMPLICIT_DECL (name)
2329 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2330 TREE_ADDRESSABLE (x) = 1;
2332 /* Warn about mismatches against previous implicit decl. */
2333 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2334 /* If this real decl matches the implicit, don't complain. */
2335 && ! (TREE_CODE (x) == FUNCTION_DECL
2336 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2337 == integer_type_node)))
2338 pedwarn ("`%s' was previously implicitly declared to return `int'",
2339 IDENTIFIER_POINTER (name));
2341 /* If this decl is `static' and an `extern' was seen previously,
2342 that is erroneous. */
2343 if (TREE_PUBLIC (name)
2344 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2346 /* Okay to redeclare an ANSI built-in as static. */
2347 if (t != 0 && DECL_BUILT_IN (t))
2349 /* Okay to declare a non-ANSI built-in as anything. */
2350 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2352 /* Okay to have global type decl after an earlier extern
2353 declaration inside a lexical block. */
2354 else if (TREE_CODE (x) == TYPE_DECL)
2356 else if (IDENTIFIER_IMPLICIT_DECL (name))
2358 if (! TREE_THIS_VOLATILE (name))
2359 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2360 IDENTIFIER_POINTER (name));
2363 pedwarn ("`%s' was declared `extern' and later `static'",
2364 IDENTIFIER_POINTER (name));
2369 /* Here to install a non-global value. */
2370 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2371 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2373 IDENTIFIER_LOCAL_VALUE (name) = x;
2375 /* If this is an extern function declaration, see if we
2376 have a global definition or declaration for the function. */
2379 && TREE_CODE (x) == FUNCTION_DECL
2380 && TREE_CODE (oldglobal) == FUNCTION_DECL
2381 && DECL_EXTERNAL (x) && ! DECL_INLINE (x))
2383 /* We have one. Their types must agree. */
2384 if (! comptypes (TREE_TYPE (x),
2385 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2386 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2389 /* Inner extern decl is inline if global one is.
2390 Copy enough to really inline it. */
2391 if (DECL_INLINE (oldglobal))
2393 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2394 DECL_INITIAL (x) = (current_function_decl == oldglobal
2395 ? 0 : DECL_INITIAL (oldglobal));
2396 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2397 DECL_FRAME_SIZE (x) = DECL_FRAME_SIZE (oldglobal);
2398 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2399 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2400 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2401 DECL_ABSTRACT_ORIGIN (x)
2402 = DECL_ABSTRACT_ORIGIN (oldglobal);
2404 /* Inner extern decl is built-in if global one is. */
2405 if (DECL_BUILT_IN (oldglobal))
2407 DECL_BUILT_IN_CLASS (x) = DECL_BUILT_IN_CLASS (oldglobal);
2408 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2410 /* Keep the arg types from a file-scope fcn defn. */
2411 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2412 && DECL_INITIAL (oldglobal)
2413 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2414 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2419 /* This case is probably sometimes the right thing to do. */
2420 /* If we have a local external declaration,
2421 then any file-scope declaration should not
2422 have been static. */
2423 if (oldlocal == 0 && oldglobal != 0
2424 && !TREE_PUBLIC (oldglobal)
2425 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2426 warning ("`%s' locally external but globally static",
2427 IDENTIFIER_POINTER (name));
2430 /* If we have a local external declaration,
2431 and no file-scope declaration has yet been seen,
2432 then if we later have a file-scope decl it must not be static. */
2434 && DECL_EXTERNAL (x)
2438 TREE_PUBLIC (name) = 1;
2440 /* Save this decl, so that we can do type checking against
2441 other decls after it falls out of scope.
2443 Only save it once. This prevents temporary decls created in
2444 expand_inline_function from being used here, since this
2445 will have been set when the inline function was parsed.
2446 It also helps give slightly better warnings. */
2447 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2448 IDENTIFIER_LIMBO_VALUE (name) = x;
2451 /* Warn if shadowing an argument at the top level of the body. */
2452 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2453 /* This warning doesn't apply to the parms of a nested fcn. */
2454 && ! current_binding_level->parm_flag
2455 /* Check that this is one level down from the parms. */
2456 && current_binding_level->level_chain->parm_flag
2457 /* Check that the decl being shadowed
2458 comes from the parm level, one level up. */
2459 && chain_member (oldlocal, current_binding_level->level_chain->names))
2461 if (TREE_CODE (oldlocal) == PARM_DECL)
2462 pedwarn ("declaration of `%s' shadows a parameter",
2463 IDENTIFIER_POINTER (name));
2465 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2466 IDENTIFIER_POINTER (name));
2469 /* Maybe warn if shadowing something else. */
2470 else if (warn_shadow && !DECL_EXTERNAL (x)
2471 /* No shadow warnings for internally generated vars. */
2472 && DECL_SOURCE_LINE (x) != 0
2473 /* No shadow warnings for vars made for inlining. */
2474 && ! DECL_FROM_INLINE (x))
2476 const char *id = IDENTIFIER_POINTER (name);
2478 if (TREE_CODE (x) == PARM_DECL
2479 && current_binding_level->level_chain->parm_flag)
2480 /* Don't warn about the parm names in function declarator
2481 within a function declarator.
2482 It would be nice to avoid warning in any function
2483 declarator in a declaration, as opposed to a definition,
2484 but there is no way to tell it's not a definition. */
2486 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2487 warning ("declaration of `%s' shadows a parameter", id);
2488 else if (oldlocal != 0)
2489 warning ("declaration of `%s' shadows previous local", id);
2490 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2491 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2492 warning ("declaration of `%s' shadows global declaration", id);
2495 /* If storing a local value, there may already be one (inherited).
2496 If so, record it for restoration when this binding level ends. */
2498 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2501 /* Keep count of variables in this level with incomplete type.
2502 If the input is erroneous, we can have error_mark in the type
2503 slot (e.g. "f(void a, ...)") - that doesn't count as an
2505 if (TREE_TYPE (x) != error_mark_node
2506 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2510 /* Put decls on list in reverse order.
2511 We will reverse them later if necessary. */
2512 TREE_CHAIN (x) = b->names;
2518 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2521 pushdecl_top_level (x)
2525 register struct binding_level *b = current_binding_level;
2527 current_binding_level = global_binding_level;
2529 current_binding_level = b;
2533 /* Generate an implicit declaration for identifier FUNCTIONID
2534 as a function of type int (). Print a warning if appropriate. */
2537 implicitly_declare (functionid)
2541 int traditional_warning = 0;
2542 /* Only one "implicit declaration" warning per identifier. */
2543 int implicit_warning;
2545 /* We used to reuse an old implicit decl here,
2546 but this loses with inline functions because it can clobber
2547 the saved decl chains. */
2549 if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2550 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2553 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2555 /* Warn of implicit decl following explicit local extern decl.
2556 This is probably a program designed for traditional C. */
2557 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2558 traditional_warning = 1;
2560 /* Warn once of an implicit declaration. */
2561 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2563 DECL_EXTERNAL (decl) = 1;
2564 TREE_PUBLIC (decl) = 1;
2566 /* Record that we have an implicit decl and this is it. */
2567 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2569 /* ANSI standard says implicit declarations are in the innermost block.
2570 So we record the decl in the standard fashion.
2571 If flag_traditional is set, pushdecl does it top-level. */
2574 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2575 maybe_objc_check_decl (decl);
2577 rest_of_decl_compilation (decl, NULL_PTR, 0, 0);
2579 if (implicit_warning)
2580 implicit_decl_warning (functionid);
2581 else if (warn_traditional && traditional_warning)
2582 warning ("function `%s' was previously declared within a block",
2583 IDENTIFIER_POINTER (functionid));
2585 /* Write a record describing this implicit function declaration to the
2586 prototypes file (if requested). */
2588 gen_aux_info_record (decl, 0, 1, 0);
2594 implicit_decl_warning (id)
2597 const char *name = IDENTIFIER_POINTER (id);
2598 if (mesg_implicit_function_declaration == 2)
2599 error ("implicit declaration of function `%s'", name);
2600 else if (mesg_implicit_function_declaration == 1)
2601 warning ("implicit declaration of function `%s'", name);
2604 /* Return zero if the declaration NEWDECL is valid
2605 when the declaration OLDDECL (assumed to be for the same name)
2606 has already been seen.
2607 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
2608 and 3 if it is a conflicting declaration. */
2611 redeclaration_error_message (newdecl, olddecl)
2612 tree newdecl, olddecl;
2614 if (TREE_CODE (newdecl) == TYPE_DECL)
2616 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2618 /* pushdecl creates distinct types for TYPE_DECLs by calling
2619 build_type_copy, so the above comparison generally fails. We do
2620 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2621 is equivalent to what this code used to do before the build_type_copy
2622 call. The variant type distinction should not matter for traditional
2623 code, because it doesn't have type qualifiers. */
2624 if (flag_traditional
2625 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
2627 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2631 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2633 /* Declarations of functions can insist on internal linkage
2634 but they can't be inconsistent with internal linkage,
2635 so there can be no error on that account.
2636 However defining the same name twice is no good. */
2637 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2638 /* However, defining once as extern inline and a second
2639 time in another way is ok. */
2640 && ! (DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2641 && ! (DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2645 else if (DECL_CONTEXT (newdecl) == NULL_TREE)
2647 /* Objects declared at top level: */
2648 /* If at least one is a reference, it's ok. */
2649 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2651 /* Reject two definitions. */
2652 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2654 /* Now we have two tentative defs, or one tentative and one real def. */
2655 /* Insist that the linkage match. */
2656 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2660 else if (current_binding_level->parm_flag
2661 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2665 /* Newdecl has block scope. If olddecl has block scope also, then
2666 reject two definitions, and reject a definition together with an
2667 external reference. Otherwise, it is OK, because newdecl must
2668 be an extern reference to olddecl. */
2669 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2670 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2676 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2677 Create one if none exists so far for the current function.
2678 This function is called for both label definitions and label references. */
2684 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2686 if (current_function_decl == 0)
2688 error ("label %s referenced outside of any function",
2689 IDENTIFIER_POINTER (id));
2693 /* Use a label already defined or ref'd with this name. */
2696 /* But not if it is inherited and wasn't declared to be inheritable. */
2697 if (DECL_CONTEXT (decl) != current_function_decl
2698 && ! C_DECLARED_LABEL_FLAG (decl))
2699 return shadow_label (id);
2703 decl = build_decl (LABEL_DECL, id, void_type_node);
2705 /* A label not explicitly declared must be local to where it's ref'd. */
2706 DECL_CONTEXT (decl) = current_function_decl;
2708 DECL_MODE (decl) = VOIDmode;
2710 /* Say where one reference is to the label,
2711 for the sake of the error if it is not defined. */
2712 DECL_SOURCE_LINE (decl) = lineno;
2713 DECL_SOURCE_FILE (decl) = input_filename;
2715 IDENTIFIER_LABEL_VALUE (id) = decl;
2717 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2722 /* Make a label named NAME in the current function,
2723 shadowing silently any that may be inherited from containing functions
2724 or containing scopes.
2726 Note that valid use, if the label being shadowed
2727 comes from another scope in the same function,
2728 requires calling declare_nonlocal_label right away. */
2734 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2740 /* Check to make sure that the label hasn't already been declared
2741 at this label scope */
2742 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2743 if (TREE_VALUE (dup) == decl)
2745 error ("duplicate label declaration `%s'",
2746 IDENTIFIER_POINTER (name));
2747 error_with_decl (TREE_VALUE (dup),
2748 "this is a previous declaration");
2749 /* Just use the previous declaration. */
2750 return lookup_label (name);
2753 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2754 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2757 return lookup_label (name);
2760 /* Define a label, specifying the location in the source file.
2761 Return the LABEL_DECL node for the label, if the definition is valid.
2762 Otherwise return 0. */
2765 define_label (filename, line, name)
2766 const char *filename;
2770 tree decl = lookup_label (name);
2772 /* If label with this name is known from an outer context, shadow it. */
2773 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2775 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2776 IDENTIFIER_LABEL_VALUE (name) = 0;
2777 decl = lookup_label (name);
2780 if (warn_traditional && !in_system_header && lookup_name (name))
2781 warning_with_file_and_line (filename, line,
2782 "traditional C lacks a separate namespace for labels, identifier `%s' conflicts",
2783 IDENTIFIER_POINTER (name));
2785 if (DECL_INITIAL (decl) != 0)
2787 error_with_file_and_line (filename, line, "duplicate label `%s'",
2788 IDENTIFIER_POINTER (name));
2793 /* Mark label as having been defined. */
2794 DECL_INITIAL (decl) = error_mark_node;
2795 /* Say where in the source. */
2796 DECL_SOURCE_FILE (decl) = filename;
2797 DECL_SOURCE_LINE (decl) = line;
2802 /* Return the list of declarations of the current level.
2803 Note that this list is in reverse order unless/until
2804 you nreverse it; and when you do nreverse it, you must
2805 store the result back using `storedecls' or you will lose. */
2810 return current_binding_level->names;
2813 /* Return the list of type-tags (for structs, etc) of the current level. */
2818 return current_binding_level->tags;
2821 /* Store the list of declarations of the current level.
2822 This is done for the parameter declarations of a function being defined,
2823 after they are modified in the light of any missing parameters. */
2829 current_binding_level->names = decls;
2832 /* Similarly, store the list of tags of the current level. */
2838 current_binding_level->tags = tags;
2841 /* Given NAME, an IDENTIFIER_NODE,
2842 return the structure (or union or enum) definition for that name.
2843 Searches binding levels from BINDING_LEVEL up to the global level.
2844 If THISLEVEL_ONLY is nonzero, searches only the specified context
2845 (but skips any tag-transparent contexts to find one that is
2846 meaningful for tags).
2847 CODE says which kind of type the caller wants;
2848 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2849 If the wrong kind of type is found, an error is reported. */
2852 lookup_tag (code, name, binding_level, thislevel_only)
2853 enum tree_code code;
2854 struct binding_level *binding_level;
2858 register struct binding_level *level;
2860 for (level = binding_level; level; level = level->level_chain)
2863 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2865 if (TREE_PURPOSE (tail) == name)
2867 if (TREE_CODE (TREE_VALUE (tail)) != code)
2869 /* Definition isn't the kind we were looking for. */
2870 pending_invalid_xref = name;
2871 pending_invalid_xref_file = input_filename;
2872 pending_invalid_xref_line = lineno;
2874 return TREE_VALUE (tail);
2877 if (thislevel_only && ! level->tag_transparent)
2883 /* Print an error message now
2884 for a recent invalid struct, union or enum cross reference.
2885 We don't print them immediately because they are not invalid
2886 when used in the `struct foo;' construct for shadowing. */
2889 pending_xref_error ()
2891 if (pending_invalid_xref != 0)
2892 error_with_file_and_line (pending_invalid_xref_file,
2893 pending_invalid_xref_line,
2894 "`%s' defined as wrong kind of tag",
2895 IDENTIFIER_POINTER (pending_invalid_xref));
2896 pending_invalid_xref = 0;
2899 /* Given a type, find the tag that was defined for it and return the tag name.
2900 Otherwise return 0. */
2903 lookup_tag_reverse (type)
2906 register struct binding_level *level;
2908 for (level = current_binding_level; level; level = level->level_chain)
2911 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2913 if (TREE_VALUE (tail) == type)
2914 return TREE_PURPOSE (tail);
2920 /* Look up NAME in the current binding level and its superiors
2921 in the namespace of variables, functions and typedefs.
2922 Return a ..._DECL node of some kind representing its definition,
2923 or return 0 if it is undefined. */
2931 if (current_binding_level != global_binding_level
2932 && IDENTIFIER_LOCAL_VALUE (name))
2933 val = IDENTIFIER_LOCAL_VALUE (name);
2935 val = IDENTIFIER_GLOBAL_VALUE (name);
2939 /* Similar to `lookup_name' but look only at current binding level. */
2942 lookup_name_current_level (name)
2947 if (current_binding_level == global_binding_level)
2948 return IDENTIFIER_GLOBAL_VALUE (name);
2950 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2953 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2954 if (DECL_NAME (t) == name)
2960 /* Mark ARG for GC. */
2963 mark_binding_level (arg)
2966 struct binding_level *level = *(struct binding_level **) arg;
2968 for (; level != 0; level = level->level_chain)
2970 ggc_mark_tree (level->names);
2971 ggc_mark_tree (level->tags);
2972 ggc_mark_tree (level->shadowed);
2973 ggc_mark_tree (level->blocks);
2974 ggc_mark_tree (level->this_block);
2975 ggc_mark_tree (level->parm_order);
2979 /* Create the predefined scalar types of C,
2980 and some nodes representing standard constants (0, 1, (void *) 0).
2981 Initialize the global binding level.
2982 Make definitions for built-in primitive functions. */
2985 init_decl_processing ()
2987 register tree endlink;
2988 tree ptr_ftype_void, ptr_ftype_ptr;
2989 int wchar_type_size;
2990 tree array_domain_type;
2993 current_function_decl = NULL;
2994 named_labels = NULL;
2995 current_binding_level = NULL_BINDING_LEVEL;
2996 free_binding_level = NULL_BINDING_LEVEL;
2998 /* Make the binding_level structure for global names. */
3000 global_binding_level = current_binding_level;
3002 build_common_tree_nodes (flag_signed_char);
3004 /* Define `int' and `char' first so that dbx will output them first. */
3005 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_INT],
3006 integer_type_node));
3007 pushdecl (build_decl (TYPE_DECL, get_identifier ("char"),
3009 pushdecl (build_decl (TYPE_DECL, get_identifier ("long int"),
3010 long_integer_type_node));
3011 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned int"),
3012 unsigned_type_node));
3013 pushdecl (build_decl (TYPE_DECL, get_identifier ("long unsigned int"),
3014 long_unsigned_type_node));
3015 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long int"),
3016 long_long_integer_type_node));
3017 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long unsigned int"),
3018 long_long_unsigned_type_node));
3019 pushdecl (build_decl (TYPE_DECL, get_identifier ("short int"),
3020 short_integer_type_node));
3021 pushdecl (build_decl (TYPE_DECL, get_identifier ("short unsigned int"),
3022 short_unsigned_type_node));
3023 pushdecl (build_decl (TYPE_DECL, get_identifier ("signed char"),
3024 signed_char_type_node));
3025 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned char"),
3026 unsigned_char_type_node));
3027 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intQI_type_node));
3028 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intHI_type_node));
3029 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intSI_type_node));
3030 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
3031 #if HOST_BITS_PER_WIDE_INT >= 64
3032 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intTI_type_node));
3034 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node));
3035 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intHI_type_node));
3036 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intSI_type_node));
3037 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node));
3038 #if HOST_BITS_PER_WIDE_INT >= 64
3039 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intTI_type_node));
3042 /* `unsigned long' is the standard type for sizeof.
3043 Traditionally, use a signed type.
3044 Note that stddef.h uses `unsigned long',
3045 and this must agree, even if long and int are the same size. */
3046 t = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE)));
3047 signed_size_type_node = signed_type (t);
3048 if (flag_traditional && TREE_UNSIGNED (t))
3049 t = signed_type (t);
3051 c_size_type_node = t;
3054 /* Create the widest literal types. */
3055 widest_integer_literal_type_node
3056 = make_signed_type (HOST_BITS_PER_WIDE_INT * 2);
3057 widest_unsigned_literal_type_node
3058 = make_unsigned_type (HOST_BITS_PER_WIDE_INT * 2);
3059 pushdecl (build_decl (TYPE_DECL, NULL_TREE,
3060 widest_integer_literal_type_node));
3061 pushdecl (build_decl (TYPE_DECL, NULL_TREE,
3062 widest_unsigned_literal_type_node));
3064 build_common_tree_nodes_2 (flag_short_double);
3066 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_FLOAT],
3068 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_DOUBLE],
3070 pushdecl (build_decl (TYPE_DECL, get_identifier ("long double"),
3071 long_double_type_node));
3072 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex int"),
3073 complex_integer_type_node));
3074 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex float"),
3075 complex_float_type_node));
3076 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex double"),
3077 complex_double_type_node));
3078 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex long double"),
3079 complex_long_double_type_node));
3080 pushdecl (build_decl (TYPE_DECL,
3081 ridpointers[(int) RID_VOID], void_type_node));
3083 #ifdef MD_INIT_BUILTINS
3087 wchar_type_node = get_identifier (flag_short_wchar
3088 ? "short unsigned int"
3090 wchar_type_node = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (wchar_type_node));
3091 wchar_type_size = TYPE_PRECISION (wchar_type_node);
3092 signed_wchar_type_node = signed_type (wchar_type_node);
3093 unsigned_wchar_type_node = unsigned_type (wchar_type_node);
3096 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (WINT_TYPE)));
3099 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (INTMAX_TYPE)));
3101 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (UINTMAX_TYPE)));
3103 boolean_type_node = integer_type_node;
3104 boolean_true_node = integer_one_node;
3105 boolean_false_node = integer_zero_node;
3107 string_type_node = build_pointer_type (char_type_node);
3108 const_string_type_node
3109 = build_pointer_type (build_type_variant (char_type_node, 1, 0));
3111 /* Make a type to be the domain of a few array types
3112 whose domains don't really matter.
3113 200 is small enough that it always fits in size_t
3114 and large enough that it can hold most function names for the
3115 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
3116 array_domain_type = build_index_type (build_int_2 (200, 0));
3118 /* make a type for arrays of characters.
3119 With luck nothing will ever really depend on the length of this
3121 char_array_type_node = build_array_type (char_type_node, array_domain_type);
3123 /* Likewise for arrays of ints. */
3125 = build_array_type (integer_type_node, array_domain_type);
3127 /* This is for wide string constants. */
3128 wchar_array_type_node
3129 = build_array_type (wchar_type_node, array_domain_type);
3131 void_list_node = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
3133 default_function_type = build_function_type (integer_type_node, NULL_TREE);
3135 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE)));
3136 unsigned_ptrdiff_type_node = unsigned_type (ptrdiff_type_node);
3138 c_common_nodes_and_builtins ();
3140 endlink = void_list_node;
3141 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
3143 = build_function_type (ptr_type_node,
3144 tree_cons (NULL_TREE, ptr_type_node, endlink));
3146 /* Types which are common to the fortran compiler and libf2c. When
3147 changing these, you also need to be concerned with f/com.h. */
3149 if (TYPE_PRECISION (float_type_node)
3150 == TYPE_PRECISION (long_integer_type_node))
3152 g77_integer_type_node = long_integer_type_node;
3153 g77_uinteger_type_node = long_unsigned_type_node;
3155 else if (TYPE_PRECISION (float_type_node)
3156 == TYPE_PRECISION (integer_type_node))
3158 g77_integer_type_node = integer_type_node;
3159 g77_uinteger_type_node = unsigned_type_node;
3162 g77_integer_type_node = g77_uinteger_type_node = NULL_TREE;
3164 if (g77_integer_type_node != NULL_TREE)
3166 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_integer"),
3167 g77_integer_type_node));
3168 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_uinteger"),
3169 g77_uinteger_type_node));
3172 if (TYPE_PRECISION (float_type_node) * 2
3173 == TYPE_PRECISION (long_integer_type_node))
3175 g77_longint_type_node = long_integer_type_node;
3176 g77_ulongint_type_node = long_unsigned_type_node;
3178 else if (TYPE_PRECISION (float_type_node) * 2
3179 == TYPE_PRECISION (long_long_integer_type_node))
3181 g77_longint_type_node = long_long_integer_type_node;
3182 g77_ulongint_type_node = long_long_unsigned_type_node;
3185 g77_longint_type_node = g77_ulongint_type_node = NULL_TREE;
3187 if (g77_longint_type_node != NULL_TREE)
3189 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_longint"),
3190 g77_longint_type_node));
3191 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_ulongint"),
3192 g77_ulongint_type_node));
3195 builtin_function ("__builtin_aggregate_incoming_address",
3196 build_function_type (ptr_type_node, NULL_TREE),
3197 BUILT_IN_AGGREGATE_INCOMING_ADDRESS,
3198 BUILT_IN_NORMAL, NULL_PTR);
3200 /* Hooks for the DWARF 2 __throw routine. */
3201 builtin_function ("__builtin_unwind_init",
3202 build_function_type (void_type_node, endlink),
3203 BUILT_IN_UNWIND_INIT, BUILT_IN_NORMAL, NULL_PTR);
3204 builtin_function ("__builtin_dwarf_cfa", ptr_ftype_void,
3205 BUILT_IN_DWARF_CFA, BUILT_IN_NORMAL, NULL_PTR);
3206 builtin_function ("__builtin_dwarf_fp_regnum",
3207 build_function_type (unsigned_type_node, endlink),
3208 BUILT_IN_DWARF_FP_REGNUM, BUILT_IN_NORMAL, NULL_PTR);
3209 builtin_function ("__builtin_init_dwarf_reg_size_table", void_ftype_ptr,
3210 BUILT_IN_INIT_DWARF_REG_SIZES, BUILT_IN_NORMAL, NULL_PTR);
3211 builtin_function ("__builtin_frob_return_addr", ptr_ftype_ptr,
3212 BUILT_IN_FROB_RETURN_ADDR, BUILT_IN_NORMAL, NULL_PTR);
3213 builtin_function ("__builtin_extract_return_addr", ptr_ftype_ptr,
3214 BUILT_IN_EXTRACT_RETURN_ADDR, BUILT_IN_NORMAL, NULL_PTR);
3216 ("__builtin_eh_return",
3217 build_function_type (void_type_node,
3218 tree_cons (NULL_TREE, ptr_type_node,
3219 tree_cons (NULL_TREE,
3220 type_for_mode (ptr_mode, 0),
3221 tree_cons (NULL_TREE,
3224 BUILT_IN_EH_RETURN, BUILT_IN_NORMAL, NULL_PTR);
3226 pedantic_lvalues = pedantic;
3228 /* Create the global bindings for __FUNCTION__, __PRETTY_FUNCTION__,
3230 function_id_node = get_identifier ("__FUNCTION__");
3231 pretty_function_id_node = get_identifier ("__PRETTY_FUNCTION__");
3232 func_id_node = get_identifier ("__func__");
3233 make_fname_decl = c_make_fname_decl;
3234 declare_function_name ();
3236 start_identifier_warnings ();
3238 /* Prepare to check format strings against argument lists. */
3239 init_function_format_info ();
3241 incomplete_decl_finalize_hook = finish_incomplete_decl;
3243 /* Record our roots. */
3245 ggc_add_tree_root (c_global_trees, CTI_MAX);
3246 ggc_add_root (&c_stmt_tree, 1, sizeof c_stmt_tree, mark_stmt_tree);
3247 ggc_add_tree_root (&c_scope_stmt_stack, 1);
3248 ggc_add_tree_root (&named_labels, 1);
3249 ggc_add_tree_root (&shadowed_labels, 1);
3250 ggc_add_root (¤t_binding_level, 1, sizeof current_binding_level,
3251 mark_binding_level);
3252 ggc_add_root (&label_level_chain, 1, sizeof label_level_chain,
3253 mark_binding_level);
3254 ggc_add_tree_root (&static_ctors, 1);
3255 ggc_add_tree_root (&static_dtors, 1);
3258 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3259 decl, NAME is the initialization string and TYPE_DEP indicates whether
3260 NAME depended on the type of the function. As we don't yet implement
3261 delayed emission of static data, we mark the decl as emitted
3262 so it is not placed in the output. Anything using it must therefore pull
3263 out the STRING_CST initializer directly. This does mean that these names
3264 are string merging candidates, which is wrong for C99's __func__. FIXME. */
3267 c_make_fname_decl (id, name, type_dep)
3270 int type_dep ATTRIBUTE_UNUSED;
3272 tree decl, type, init;
3273 size_t length = strlen (name);
3275 type = build_array_type
3276 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
3277 build_index_type (build_int_2 (length, 0)));
3279 decl = build_decl (VAR_DECL, id, type);
3280 TREE_STATIC (decl) = 1;
3281 TREE_READONLY (decl) = 1;
3282 TREE_ASM_WRITTEN (decl) = 1;
3283 DECL_SOURCE_LINE (decl) = 0;
3284 DECL_ARTIFICIAL (decl) = 1;
3285 DECL_IN_SYSTEM_HEADER (decl) = 1;
3286 DECL_IGNORED_P (decl) = 1;
3287 init = build_string (length + 1, name);
3288 TREE_TYPE (init) = type;
3289 DECL_INITIAL (decl) = init;
3290 finish_decl (pushdecl (decl), init, NULL_TREE);
3295 /* Return a definition for a builtin function named NAME and whose data type
3296 is TYPE. TYPE should be a function type with argument types.
3297 FUNCTION_CODE tells later passes how to compile calls to this function.
3298 See tree.h for its possible values.
3300 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3301 the name to be called if we can't opencode the function. */
3304 builtin_function (name, type, function_code, class, library_name)
3308 enum built_in_class class;
3309 const char *library_name;
3311 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3312 DECL_EXTERNAL (decl) = 1;
3313 TREE_PUBLIC (decl) = 1;
3314 /* If -traditional, permit redefining a builtin function any way you like.
3315 (Though really, if the program redefines these functions,
3316 it probably won't work right unless compiled with -fno-builtin.) */
3317 if (flag_traditional && name[0] != '_')
3318 DECL_BUILT_IN_NONANSI (decl) = 1;
3320 DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
3321 make_decl_rtl (decl, NULL_PTR, 1);
3323 DECL_BUILT_IN_CLASS (decl) = class;
3324 DECL_FUNCTION_CODE (decl) = function_code;
3326 /* Warn if a function in the namespace for users
3327 is used without an occasion to consider it declared. */
3328 if (name[0] != '_' || name[1] != '_')
3329 C_DECL_ANTICIPATED (decl) = 1;
3334 /* Called when a declaration is seen that contains no names to declare.
3335 If its type is a reference to a structure, union or enum inherited
3336 from a containing scope, shadow that tag name for the current scope
3337 with a forward reference.
3338 If its type defines a new named structure or union
3339 or defines an enum, it is valid but we need not do anything here.
3340 Otherwise, it is an error. */
3343 shadow_tag (declspecs)
3346 shadow_tag_warned (declspecs, 0);
3350 shadow_tag_warned (declspecs, warned)
3353 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3360 pending_invalid_xref = 0;
3362 /* Remove the attributes from declspecs, since they will confuse the
3364 split_specs_attrs (declspecs, &specs, &attrs);
3366 for (link = specs; link; link = TREE_CHAIN (link))
3368 register tree value = TREE_VALUE (link);
3369 register enum tree_code code = TREE_CODE (value);
3371 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3372 /* Used to test also that TYPE_SIZE (value) != 0.
3373 That caused warning for `struct foo;' at top level in the file. */
3375 register tree name = lookup_tag_reverse (value);
3382 if (warned != 1 && code != ENUMERAL_TYPE)
3383 /* Empty unnamed enum OK */
3385 pedwarn ("unnamed struct/union that defines no instances");
3391 t = lookup_tag (code, name, current_binding_level, 1);
3395 t = make_node (code);
3402 if (!warned && ! in_system_header)
3404 warning ("useless keyword or type name in empty declaration");
3411 error ("two types specified in one empty declaration");
3416 pedwarn ("empty declaration");
3420 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3423 groktypename (typename)
3426 if (TREE_CODE (typename) != TREE_LIST)
3428 return grokdeclarator (TREE_VALUE (typename),
3429 TREE_PURPOSE (typename),
3433 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3436 groktypename_in_parm_context (typename)
3439 if (TREE_CODE (typename) != TREE_LIST)
3441 return grokdeclarator (TREE_VALUE (typename),
3442 TREE_PURPOSE (typename),
3446 /* Decode a declarator in an ordinary declaration or data definition.
3447 This is called as soon as the type information and variable name
3448 have been parsed, before parsing the initializer if any.
3449 Here we create the ..._DECL node, fill in its type,
3450 and put it on the list of decls for the current context.
3451 The ..._DECL node is returned as the value.
3453 Exception: for arrays where the length is not specified,
3454 the type is left null, to be filled in by `finish_decl'.
3456 Function definitions do not come here; they go to start_function
3457 instead. However, external and forward declarations of functions
3458 do go through here. Structure field declarations are done by
3459 grokfield and not through here. */
3462 start_decl (declarator, declspecs, initialized, attributes, prefix_attributes)
3463 tree declarator, declspecs;
3465 tree attributes, prefix_attributes;
3467 register tree decl = grokdeclarator (declarator, declspecs,
3468 NORMAL, initialized);
3471 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3472 && MAIN_NAME_P (DECL_NAME (decl)))
3473 warning_with_decl (decl, "`%s' is usually a function");
3476 /* Is it valid for this decl to have an initializer at all?
3477 If not, set INITIALIZED to zero, which will indirectly
3478 tell `finish_decl' to ignore the initializer once it is parsed. */
3479 switch (TREE_CODE (decl))
3482 /* typedef foo = bar means give foo the same type as bar.
3483 We haven't parsed bar yet, so `finish_decl' will fix that up.
3484 Any other case of an initialization in a TYPE_DECL is an error. */
3485 if (pedantic || list_length (declspecs) > 1)
3487 error ("typedef `%s' is initialized",
3488 IDENTIFIER_POINTER (DECL_NAME (decl)));
3494 error ("function `%s' is initialized like a variable",
3495 IDENTIFIER_POINTER (DECL_NAME (decl)));
3500 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3501 error ("parameter `%s' is initialized",
3502 IDENTIFIER_POINTER (DECL_NAME (decl)));
3507 /* Don't allow initializations for incomplete types
3508 except for arrays which might be completed by the initialization. */
3509 if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3511 /* A complete type is ok if size is fixed. */
3513 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3514 || C_DECL_VARIABLE_SIZE (decl))
3516 error ("variable-sized object may not be initialized");
3520 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3522 error ("variable `%s' has initializer but incomplete type",
3523 IDENTIFIER_POINTER (DECL_NAME (decl)));
3526 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
3528 error ("elements of array `%s' have incomplete type",
3529 IDENTIFIER_POINTER (DECL_NAME (decl)));
3537 /* Seems redundant with grokdeclarator. */
3538 if (current_binding_level != global_binding_level
3539 && DECL_EXTERNAL (decl)
3540 && TREE_CODE (decl) != FUNCTION_DECL)
3541 warning ("declaration of `%s' has `extern' and is initialized",
3542 IDENTIFIER_POINTER (DECL_NAME (decl)));
3544 DECL_EXTERNAL (decl) = 0;
3545 if (current_binding_level == global_binding_level)
3546 TREE_STATIC (decl) = 1;
3548 /* Tell `pushdecl' this is an initialized decl
3549 even though we don't yet have the initializer expression.
3550 Also tell `finish_decl' it may store the real initializer. */
3551 DECL_INITIAL (decl) = error_mark_node;
3554 /* If this is a function declaration, write a record describing it to the
3555 prototypes file (if requested). */
3557 if (TREE_CODE (decl) == FUNCTION_DECL)
3558 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3560 /* ANSI specifies that a tentative definition which is not merged with
3561 a non-tentative definition behaves exactly like a definition with an
3562 initializer equal to zero. (Section 3.7.2)
3563 -fno-common gives strict ANSI behavior. Usually you don't want it.
3564 This matters only for variables with external linkage. */
3565 if (! flag_no_common || ! TREE_PUBLIC (decl))
3566 DECL_COMMON (decl) = 1;
3568 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
3569 SET_DEFAULT_DECL_ATTRIBUTES (decl, attributes);
3572 /* Set attributes here so if duplicate decl, will have proper attributes. */
3573 decl_attributes (decl, attributes, prefix_attributes);
3575 /* Add this decl to the current binding level.
3576 TEM may equal DECL or it may be a previous decl of the same name. */
3577 tem = pushdecl (decl);
3579 /* For a local variable, define the RTL now. */
3580 if (current_binding_level != global_binding_level
3581 /* But not if this is a duplicate decl
3582 and we preserved the rtl from the previous one
3583 (which may or may not happen). */
3584 && DECL_RTL (tem) == 0
3585 && !DECL_CONTEXT (tem))
3587 if (COMPLETE_TYPE_P (TREE_TYPE (tem)))
3589 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3590 && DECL_INITIAL (tem) != 0)
3597 /* Finish processing of a declaration;
3598 install its initial value.
3599 If the length of an array type is not known before,
3600 it must be determined now, from the initial value, or it is an error. */
3603 finish_decl (decl, init, asmspec_tree)
3607 register tree type = TREE_TYPE (decl);
3608 int was_incomplete = (DECL_SIZE (decl) == 0);
3611 /* If a name was specified, get the string. */
3613 asmspec = TREE_STRING_POINTER (asmspec_tree);
3615 /* If `start_decl' didn't like having an initialization, ignore it now. */
3617 if (init != 0 && DECL_INITIAL (decl) == 0)
3619 /* Don't crash if parm is initialized. */
3620 if (TREE_CODE (decl) == PARM_DECL)
3625 if (TREE_CODE (decl) != TYPE_DECL)
3626 store_init_value (decl, init);
3629 /* typedef foo = bar; store the type of bar as the type of foo. */
3630 TREE_TYPE (decl) = TREE_TYPE (init);
3631 DECL_INITIAL (decl) = init = 0;
3635 /* Deduce size of array from initialization, if not already known */
3637 if (TREE_CODE (type) == ARRAY_TYPE
3638 && TYPE_DOMAIN (type) == 0
3639 && TREE_CODE (decl) != TYPE_DECL)
3642 = (TREE_STATIC (decl)
3643 /* Even if pedantic, an external linkage array
3644 may have incomplete type at first. */
3645 ? pedantic && !TREE_PUBLIC (decl)
3646 : !DECL_EXTERNAL (decl));
3648 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3650 /* Get the completed type made by complete_array_type. */
3651 type = TREE_TYPE (decl);
3654 error_with_decl (decl, "initializer fails to determine size of `%s'");
3656 else if (failure == 2)
3659 error_with_decl (decl, "array size missing in `%s'");
3660 /* If a `static' var's size isn't known,
3661 make it extern as well as static, so it does not get
3663 If it is not `static', then do not mark extern;
3664 finish_incomplete_decl will give it a default size
3665 and it will get allocated. */
3666 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3667 DECL_EXTERNAL (decl) = 1;
3670 /* TYPE_MAX_VALUE is always one less than the number of elements
3671 in the array, because we start counting at zero. Therefore,
3672 warn only if the value is less than zero. */
3673 else if (pedantic && TYPE_DOMAIN (type) != 0
3674 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3675 error_with_decl (decl, "zero or negative size array `%s'");
3677 layout_decl (decl, 0);
3680 if (TREE_CODE (decl) == VAR_DECL)
3682 if (DECL_SIZE (decl) == 0 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3683 layout_decl (decl, 0);
3685 if (DECL_SIZE (decl) == 0
3686 && (TREE_STATIC (decl)
3688 /* A static variable with an incomplete type
3689 is an error if it is initialized.
3690 Also if it is not file scope.
3691 Otherwise, let it through, but if it is not `extern'
3692 then it may cause an error message later. */
3693 (DECL_INITIAL (decl) != 0
3694 || DECL_CONTEXT (decl) != 0)
3696 /* An automatic variable with an incomplete type
3698 !DECL_EXTERNAL (decl)))
3700 error_with_decl (decl, "storage size of `%s' isn't known");
3701 TREE_TYPE (decl) = error_mark_node;
3704 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3705 && DECL_SIZE (decl) != 0)
3707 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3708 constant_expression_warning (DECL_SIZE (decl));
3710 error_with_decl (decl, "storage size of `%s' isn't constant");
3713 if (TREE_USED (type))
3714 TREE_USED (decl) = 1;
3717 /* If this is a function and an assembler name is specified, it isn't
3718 builtin any more. Also reset DECL_RTL so we can give it its new
3720 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3722 DECL_BUILT_IN_CLASS (decl) = NOT_BUILT_IN;
3723 DECL_RTL (decl) = 0;
3724 DECL_ASSEMBLER_NAME (decl) = get_identifier (asmspec);
3727 /* Output the assembler code and/or RTL code for variables and functions,
3728 unless the type is an undefined structure or union.
3729 If not, it will get done when the type is completed. */
3731 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3733 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3734 maybe_objc_check_decl (decl);
3736 if (!DECL_CONTEXT (decl))
3737 rest_of_decl_compilation (decl, asmspec,
3738 (DECL_CONTEXT (decl) == 0
3739 || TREE_ASM_WRITTEN (decl)), 0);
3743 DECL_ASSEMBLER_NAME (decl) = get_identifier (asmspec);
3744 add_decl_stmt (decl);
3747 if (DECL_CONTEXT (decl) != 0)
3749 /* Recompute the RTL of a local array now
3750 if it used to be an incomplete type. */
3752 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3754 /* If we used it already as memory, it must stay in memory. */
3755 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3756 /* If it's still incomplete now, no init will save it. */
3757 if (DECL_SIZE (decl) == 0)
3758 DECL_INITIAL (decl) = 0;
3763 if (TREE_CODE (decl) == TYPE_DECL)
3765 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3766 maybe_objc_check_decl (decl);
3767 rest_of_decl_compilation (decl, NULL_PTR, DECL_CONTEXT (decl) == 0, 0);
3770 /* At the end of a declaration, throw away any variable type sizes
3771 of types defined inside that declaration. There is no use
3772 computing them in the following function definition. */
3773 if (current_binding_level == global_binding_level)
3774 get_pending_sizes ();
3777 /* If DECL has a cleanup, build and return that cleanup here.
3778 This is a callback called by expand_expr. */
3781 maybe_build_cleanup (decl)
3782 tree decl ATTRIBUTE_UNUSED;
3784 /* There are no cleanups in C. */
3788 /* Given a parsed parameter declaration,
3789 decode it into a PARM_DECL and push that on the current binding level.
3790 Also, for the sake of forward parm decls,
3791 record the given order of parms in `parm_order'. */
3794 push_parm_decl (parm)
3798 int old_immediate_size_expand = immediate_size_expand;
3799 /* Don't try computing parm sizes now -- wait till fn is called. */
3800 immediate_size_expand = 0;
3802 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3803 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3804 decl_attributes (decl, TREE_VALUE (TREE_VALUE (parm)),
3805 TREE_PURPOSE (TREE_VALUE (parm)));
3808 if (DECL_NAME (decl))
3811 olddecl = lookup_name (DECL_NAME (decl));
3812 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3813 pedwarn_with_decl (decl,
3814 "ANSI C forbids parameter `%s' shadowing typedef");
3818 decl = pushdecl (decl);
3820 immediate_size_expand = old_immediate_size_expand;
3822 current_binding_level->parm_order
3823 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3825 /* Add this decl to the current binding level. */
3826 finish_decl (decl, NULL_TREE, NULL_TREE);
3829 /* Clear the given order of parms in `parm_order'.
3830 Used at start of parm list,
3831 and also at semicolon terminating forward decls. */
3836 current_binding_level->parm_order = NULL_TREE;
3839 /* Make TYPE a complete type based on INITIAL_VALUE.
3840 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3841 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3844 complete_array_type (type, initial_value, do_default)
3849 register tree maxindex = NULL_TREE;
3854 /* Note MAXINDEX is really the maximum index,
3855 one less than the size. */
3856 if (TREE_CODE (initial_value) == STRING_CST)
3859 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3860 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3863 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3865 tree elts = CONSTRUCTOR_ELTS (initial_value);
3866 maxindex = build_int_2 (-1, -1);
3867 for (; elts; elts = TREE_CHAIN (elts))
3869 if (TREE_PURPOSE (elts))
3870 maxindex = TREE_PURPOSE (elts);
3872 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3873 maxindex, integer_one_node));
3875 maxindex = copy_node (maxindex);
3879 /* Make an error message unless that happened already. */
3880 if (initial_value != error_mark_node)
3883 /* Prevent further error messages. */
3884 maxindex = build_int_2 (0, 0);
3891 maxindex = build_int_2 (0, 0);
3897 TYPE_DOMAIN (type) = build_index_type (maxindex);
3898 if (!TREE_TYPE (maxindex))
3899 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3902 /* Lay out the type now that we can get the real answer. */
3909 /* Given declspecs and a declarator,
3910 determine the name and type of the object declared
3911 and construct a ..._DECL node for it.
3912 (In one case we can return a ..._TYPE node instead.
3913 For invalid input we sometimes return 0.)
3915 DECLSPECS is a chain of tree_list nodes whose value fields
3916 are the storage classes and type specifiers.
3918 DECL_CONTEXT says which syntactic context this declaration is in:
3919 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3920 FUNCDEF for a function definition. Like NORMAL but a few different
3921 error messages in each case. Return value may be zero meaning
3922 this definition is too screwy to try to parse.
3923 PARM for a parameter declaration (either within a function prototype
3924 or before a function body). Make a PARM_DECL, or return void_type_node.
3925 TYPENAME if for a typename (in a cast or sizeof).
3926 Don't make a DECL node; just return the ..._TYPE node.
3927 FIELD for a struct or union field; make a FIELD_DECL.
3928 BITFIELD for a field with specified width.
3929 INITIALIZED is 1 if the decl has an initializer.
3931 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3932 It may also be so in the PARM case, for a prototype where the
3933 argument type is specified but not the name.
3935 This function is where the complicated C meanings of `static'
3936 and `extern' are interpreted. */
3939 grokdeclarator (declarator, declspecs, decl_context, initialized)
3942 enum decl_context decl_context;
3947 tree type = NULL_TREE;
3952 int type_quals = TYPE_UNQUALIFIED;
3954 int explicit_int = 0;
3955 int explicit_char = 0;
3956 int defaulted_int = 0;
3957 tree typedef_decl = 0;
3959 tree typedef_type = 0;
3960 int funcdef_flag = 0;
3961 enum tree_code innermost_code = ERROR_MARK;
3963 int size_varies = 0;
3964 tree decl_machine_attr = NULL_TREE;
3966 if (decl_context == BITFIELD)
3967 bitfield = 1, decl_context = FIELD;
3969 if (decl_context == FUNCDEF)
3970 funcdef_flag = 1, decl_context = NORMAL;
3972 /* Look inside a declarator for the name being declared
3973 and get it as a string, for an error message. */
3975 register tree decl = declarator;
3979 switch (TREE_CODE (decl))
3984 innermost_code = TREE_CODE (decl);
3985 decl = TREE_OPERAND (decl, 0);
3988 case IDENTIFIER_NODE:
3989 name = IDENTIFIER_POINTER (decl);
4000 /* A function definition's declarator must have the form of
4001 a function declarator. */
4003 if (funcdef_flag && innermost_code != CALL_EXPR)
4006 /* Anything declared one level down from the top level
4007 must be one of the parameters of a function
4008 (because the body is at least two levels down). */
4010 /* If this looks like a function definition, make it one,
4011 even if it occurs where parms are expected.
4012 Then store_parm_decls will reject it and not use it as a parm. */
4013 if (decl_context == NORMAL && !funcdef_flag
4014 && current_binding_level->parm_flag)
4015 decl_context = PARM;
4017 /* Look through the decl specs and record which ones appear.
4018 Some typespecs are defined as built-in typenames.
4019 Others, the ones that are modifiers of other types,
4020 are represented by bits in SPECBITS: set the bits for
4021 the modifiers that appear. Storage class keywords are also in SPECBITS.
4023 If there is a typedef name or a type, store the type in TYPE.
4024 This includes builtin typedefs such as `int'.
4026 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
4027 and did not come from a user typedef.
4029 Set LONGLONG if `long' is mentioned twice. */
4031 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
4033 register tree id = TREE_VALUE (spec);
4035 if (id == ridpointers[(int) RID_INT])
4037 if (id == ridpointers[(int) RID_CHAR])
4040 if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
4042 enum rid i = C_RID_CODE (id);
4043 if (i <= RID_LAST_MODIFIER)
4045 if (i == RID_LONG && specbits & (1<<i))
4048 error ("`long long long' is too long for GCC");
4051 if (pedantic && !flag_isoc99 && ! in_system_header
4053 pedwarn ("ISO C89 does not support `long long'");
4057 else if (specbits & (1 << i))
4058 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
4064 error ("two or more data types in declaration of `%s'", name);
4065 /* Actual typedefs come to us as TYPE_DECL nodes. */
4066 else if (TREE_CODE (id) == TYPE_DECL)
4068 type = TREE_TYPE (id);
4069 decl_machine_attr = DECL_MACHINE_ATTRIBUTES (id);
4072 /* Built-in types come as identifiers. */
4073 else if (TREE_CODE (id) == IDENTIFIER_NODE)
4075 register tree t = lookup_name (id);
4076 if (TREE_TYPE (t) == error_mark_node)
4078 else if (!t || TREE_CODE (t) != TYPE_DECL)
4079 error ("`%s' fails to be a typedef or built in type",
4080 IDENTIFIER_POINTER (id));
4083 type = TREE_TYPE (t);
4087 else if (TREE_CODE (id) != ERROR_MARK)
4094 typedef_type = type;
4096 size_varies = C_TYPE_VARIABLE_SIZE (type);
4098 /* No type at all: default to `int', and set DEFAULTED_INT
4099 because it was not a user-defined typedef. */
4103 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4104 | (1 << (int) RID_SIGNED)
4105 | (1 << (int) RID_UNSIGNED)
4106 | (1 << (int) RID_COMPLEX))))
4107 /* Don't warn about typedef foo = bar. */
4108 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
4109 && ! in_system_header)
4111 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
4112 and this is a function, or if -Wimplicit; prefer the former
4113 warning since it is more explicit. */
4114 if ((warn_implicit_int || warn_return_type) && funcdef_flag)
4115 warn_about_return_type = 1;
4116 else if (warn_implicit_int || flag_isoc99)
4117 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
4122 type = integer_type_node;
4125 /* Now process the modifiers that were specified
4126 and check for invalid combinations. */
4128 /* Long double is a special combination. */
4130 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4131 && TYPE_MAIN_VARIANT (type) == double_type_node)
4133 specbits &= ~(1 << (int) RID_LONG);
4134 type = long_double_type_node;
4137 /* Check all other uses of type modifiers. */
4139 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4140 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4144 if ((specbits & 1 << (int) RID_LONG)
4145 && (specbits & 1 << (int) RID_SHORT))
4146 error ("both long and short specified for `%s'", name);
4147 else if (((specbits & 1 << (int) RID_LONG)
4148 || (specbits & 1 << (int) RID_SHORT))
4150 error ("long or short specified with char for `%s'", name);
4151 else if (((specbits & 1 << (int) RID_LONG)
4152 || (specbits & 1 << (int) RID_SHORT))
4153 && TREE_CODE (type) == REAL_TYPE)
4155 static int already = 0;
4157 error ("long or short specified with floating type for `%s'", name);
4158 if (! already && ! pedantic)
4160 error ("the only valid combination is `long double'");
4164 else if ((specbits & 1 << (int) RID_SIGNED)
4165 && (specbits & 1 << (int) RID_UNSIGNED))
4166 error ("both signed and unsigned specified for `%s'", name);
4167 else if (TREE_CODE (type) != INTEGER_TYPE)
4168 error ("long, short, signed or unsigned invalid for `%s'", name);
4172 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4174 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4176 if (flag_pedantic_errors)
4181 /* Discard the type modifiers if they are invalid. */
4184 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4185 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4190 if ((specbits & (1 << (int) RID_COMPLEX))
4191 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4193 error ("complex invalid for `%s'", name);
4194 specbits &= ~(1 << (int) RID_COMPLEX);
4197 /* Decide whether an integer type is signed or not.
4198 Optionally treat bitfields as signed by default. */
4199 if (specbits & 1 << (int) RID_UNSIGNED
4200 /* Traditionally, all bitfields are unsigned. */
4201 || (bitfield && flag_traditional
4202 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4203 || (bitfield && ! flag_signed_bitfields
4204 && (explicit_int || defaulted_int || explicit_char
4205 /* A typedef for plain `int' without `signed'
4206 can be controlled just like plain `int'. */
4207 || ! (typedef_decl != 0
4208 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4209 && TREE_CODE (type) != ENUMERAL_TYPE
4210 && !(specbits & 1 << (int) RID_SIGNED)))
4213 type = long_long_unsigned_type_node;
4214 else if (specbits & 1 << (int) RID_LONG)
4215 type = long_unsigned_type_node;
4216 else if (specbits & 1 << (int) RID_SHORT)
4217 type = short_unsigned_type_node;
4218 else if (type == char_type_node)
4219 type = unsigned_char_type_node;
4220 else if (typedef_decl)
4221 type = unsigned_type (type);
4223 type = unsigned_type_node;
4225 else if ((specbits & 1 << (int) RID_SIGNED)
4226 && type == char_type_node)
4227 type = signed_char_type_node;
4229 type = long_long_integer_type_node;
4230 else if (specbits & 1 << (int) RID_LONG)
4231 type = long_integer_type_node;
4232 else if (specbits & 1 << (int) RID_SHORT)
4233 type = short_integer_type_node;
4235 if (specbits & 1 << (int) RID_COMPLEX)
4237 if (pedantic && !flag_isoc99)
4238 pedwarn ("ISO C89 does not support complex types");
4239 /* If we just have "complex", it is equivalent to
4240 "complex double", but if any modifiers at all are specified it is
4241 the complex form of TYPE. E.g, "complex short" is
4242 "complex short int". */
4244 if (defaulted_int && ! longlong
4245 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4246 | (1 << (int) RID_SIGNED)
4247 | (1 << (int) RID_UNSIGNED))))
4250 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
4251 type = complex_double_type_node;
4253 else if (type == integer_type_node)
4256 pedwarn ("ISO C does not support complex integer types");
4257 type = complex_integer_type_node;
4259 else if (type == float_type_node)
4260 type = complex_float_type_node;
4261 else if (type == double_type_node)
4262 type = complex_double_type_node;
4263 else if (type == long_double_type_node)
4264 type = complex_long_double_type_node;
4268 pedwarn ("ISO C does not support complex integer types");
4269 type = build_complex_type (type);
4273 /* Figure out the type qualifiers for the declaration. There are
4274 two ways a declaration can become qualified. One is something
4275 like `const int i' where the `const' is explicit. Another is
4276 something like `typedef const int CI; CI i' where the type of the
4277 declaration contains the `const'. */
4278 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4279 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
4280 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4281 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4282 if (constp > 1 && ! flag_isoc99)
4283 pedwarn ("duplicate `const'");
4284 if (restrictp > 1 && ! flag_isoc99)
4285 pedwarn ("duplicate `restrict'");
4286 if (volatilep > 1 && ! flag_isoc99)
4287 pedwarn ("duplicate `volatile'");
4288 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
4289 type = TYPE_MAIN_VARIANT (type);
4290 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4291 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4292 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4294 /* Warn if two storage classes are given. Default to `auto'. */
4299 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4300 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4301 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4302 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4303 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4305 /* Warn about storage classes that are invalid for certain
4306 kinds of declarations (parameters, typenames, etc.). */
4309 error ("multiple storage classes in declaration of `%s'", name);
4310 else if (funcdef_flag
4312 & ((1 << (int) RID_REGISTER)
4313 | (1 << (int) RID_AUTO)
4314 | (1 << (int) RID_TYPEDEF))))
4316 if (specbits & 1 << (int) RID_AUTO
4317 && (pedantic || current_binding_level == global_binding_level))
4318 pedwarn ("function definition declared `auto'");
4319 if (specbits & 1 << (int) RID_REGISTER)
4320 error ("function definition declared `register'");
4321 if (specbits & 1 << (int) RID_TYPEDEF)
4322 error ("function definition declared `typedef'");
4323 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4324 | (1 << (int) RID_AUTO));
4326 else if (decl_context != NORMAL && nclasses > 0)
4328 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4332 switch (decl_context)
4335 error ("storage class specified for structure field `%s'",
4339 error ("storage class specified for parameter `%s'", name);
4342 error ("storage class specified for typename");
4345 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4346 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4347 | (1 << (int) RID_EXTERN));
4350 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4352 /* `extern' with initialization is invalid if not at top level. */
4353 if (current_binding_level == global_binding_level)
4354 warning ("`%s' initialized and declared `extern'", name);
4356 error ("`%s' has both `extern' and initializer", name);
4358 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4359 && current_binding_level != global_binding_level)
4360 error ("nested function `%s' declared `extern'", name);
4361 else if (current_binding_level == global_binding_level
4362 && specbits & (1 << (int) RID_AUTO))
4363 error ("top-level declaration of `%s' specifies `auto'", name);
4366 /* Now figure out the structure of the declarator proper.
4367 Descend through it, creating more complex types, until we reach
4368 the declared identifier (or NULL_TREE, in an absolute declarator). */
4370 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4372 if (type == error_mark_node)
4374 declarator = TREE_OPERAND (declarator, 0);
4378 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4379 an INDIRECT_REF (for *...),
4380 a CALL_EXPR (for ...(...)),
4381 an identifier (for the name being declared)
4382 or a null pointer (for the place in an absolute declarator
4383 where the name was omitted).
4384 For the last two cases, we have just exited the loop.
4386 At this point, TYPE is the type of elements of an array,
4387 or for a function to return, or for a pointer to point to.
4388 After this sequence of ifs, TYPE is the type of the
4389 array or function or pointer, and DECLARATOR has had its
4390 outermost layer removed. */
4392 if (TREE_CODE (declarator) == ARRAY_REF)
4394 register tree itype = NULL_TREE;
4395 register tree size = TREE_OPERAND (declarator, 1);
4396 /* The index is a signed object `sizetype' bits wide. */
4397 tree index_type = signed_type (sizetype);
4399 declarator = TREE_OPERAND (declarator, 0);
4401 /* Check for some types that there cannot be arrays of. */
4403 if (VOID_TYPE_P (type))
4405 error ("declaration of `%s' as array of voids", name);
4406 type = error_mark_node;
4409 if (TREE_CODE (type) == FUNCTION_TYPE)
4411 error ("declaration of `%s' as array of functions", name);
4412 type = error_mark_node;
4415 if (size == error_mark_node)
4416 type = error_mark_node;
4418 if (type == error_mark_node)
4421 /* If size was specified, set ITYPE to a range-type for that size.
4422 Otherwise, ITYPE remains null. finish_decl may figure it out
4423 from an initial value. */
4427 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4428 STRIP_TYPE_NOPS (size);
4430 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
4431 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
4433 error ("size of array `%s' has non-integer type", name);
4434 size = integer_one_node;
4437 if (pedantic && integer_zerop (size))
4438 pedwarn ("ISO C forbids zero-size array `%s'", name);
4440 if (TREE_CODE (size) == INTEGER_CST)
4442 constant_expression_warning (size);
4443 if (tree_int_cst_sgn (size) < 0)
4445 error ("size of array `%s' is negative", name);
4446 size = integer_one_node;
4451 /* Make sure the array size remains visibly nonconstant
4452 even if it is (eg) a const variable with known value. */
4457 if (TREE_CONSTANT (size))
4458 pedwarn ("ISO C89 forbids array `%s' whose size can't be evaluated",
4461 pedwarn ("ISO C89 forbids variable-size array `%s'",
4466 /* Convert size to index_type, so that if it is a variable
4467 the computations will be done in the proper mode. */
4468 itype = fold (build (MINUS_EXPR, index_type,
4469 convert (index_type, size),
4470 convert (index_type, size_one_node)));
4472 /* If that overflowed, the array is too big.
4473 ??? While a size of INT_MAX+1 technically shouldn't cause
4474 an overflow (because we subtract 1), the overflow is recorded
4475 during the conversion to index_type, before the subtraction.
4476 Handling this case seems like an unnecessary complication. */
4477 if (TREE_OVERFLOW (itype))
4479 error ("size of array `%s' is too large", name);
4480 type = error_mark_node;
4485 itype = variable_size (itype);
4486 itype = build_index_type (itype);
4490 /* This had bad results for pointers to arrays, as in
4491 union incomplete (*foo)[4]; */
4492 /* Complain about arrays of incomplete types, except in typedefs. */
4494 if (!COMPLETE_TYPE_P (type)
4495 /* Avoid multiple warnings for nested array types. */
4496 && TREE_CODE (type) != ARRAY_TYPE
4497 && !(specbits & (1 << (int) RID_TYPEDEF))
4498 && !C_TYPE_BEING_DEFINED (type))
4499 warning ("array type has incomplete element type");
4503 /* We shouldn't have a function type here at all!
4504 Functions aren't allowed as array elements. */
4505 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4506 && (constp || volatilep))
4507 pedwarn ("ANSI C forbids const or volatile function types");
4510 /* Build the array type itself, then merge any constancy or
4511 volatility into the target type. We must do it in this order
4512 to ensure that the TYPE_MAIN_VARIANT field of the array type
4513 is set correctly. */
4515 type = build_array_type (type, itype);
4517 type = c_build_qualified_type (type, type_quals);
4520 /* Don't clear these; leave them set so that the array type
4521 or the variable is itself const or volatile. */
4522 type_quals = TYPE_UNQUALIFIED;
4526 C_TYPE_VARIABLE_SIZE (type) = 1;
4528 else if (TREE_CODE (declarator) == CALL_EXPR)
4532 /* Declaring a function type.
4533 Make sure we have a valid type for the function to return. */
4534 if (type == error_mark_node)
4539 /* Warn about some types functions can't return. */
4541 if (TREE_CODE (type) == FUNCTION_TYPE)
4543 error ("`%s' declared as function returning a function", name);
4544 type = integer_type_node;
4546 if (TREE_CODE (type) == ARRAY_TYPE)
4548 error ("`%s' declared as function returning an array", name);
4549 type = integer_type_node;
4552 #ifndef TRADITIONAL_RETURN_FLOAT
4553 /* Traditionally, declaring return type float means double. */
4555 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4556 type = double_type_node;
4557 #endif /* TRADITIONAL_RETURN_FLOAT */
4559 /* Construct the function type and go to the next
4560 inner layer of declarator. */
4562 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4564 /* Say it's a definition
4565 only for the CALL_EXPR
4566 closest to the identifier. */
4567 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4568 /* Type qualifiers before the return type of the function
4569 qualify the return type, not the function type. */
4571 type = c_build_qualified_type (type, type_quals);
4572 type_quals = TYPE_UNQUALIFIED;
4574 type = build_function_type (type, arg_types);
4575 declarator = TREE_OPERAND (declarator, 0);
4577 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4578 the formal parameter list of this FUNCTION_TYPE to point to
4579 the FUNCTION_TYPE node itself. */
4584 for (link = last_function_parm_tags;
4586 link = TREE_CHAIN (link))
4587 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4590 else if (TREE_CODE (declarator) == INDIRECT_REF)
4592 /* Merge any constancy or volatility into the target type
4595 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4597 pedwarn ("ISO C forbids qualified function types");
4599 type = c_build_qualified_type (type, type_quals);
4600 type_quals = TYPE_UNQUALIFIED;
4603 type = build_pointer_type (type);
4605 /* Process a list of type modifier keywords
4606 (such as const or volatile) that were given inside the `*'. */
4608 if (TREE_TYPE (declarator))
4610 register tree typemodlist;
4616 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4617 typemodlist = TREE_CHAIN (typemodlist))
4619 tree qualifier = TREE_VALUE (typemodlist);
4621 if (C_IS_RESERVED_WORD (qualifier))
4623 if (C_RID_CODE (qualifier) == RID_CONST)
4625 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4627 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4637 error ("invalid type modifier within pointer declarator");
4638 if (constp > 1 && ! flag_isoc99)
4639 pedwarn ("duplicate `const'");
4640 if (volatilep > 1 && ! flag_isoc99)
4641 pedwarn ("duplicate `volatile'");
4642 if (restrictp > 1 && ! flag_isoc99)
4643 pedwarn ("duplicate `restrict'");
4645 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4646 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4647 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4650 declarator = TREE_OPERAND (declarator, 0);
4657 /* Now TYPE has the actual type. */
4659 /* Did array size calculations overflow? */
4661 if (TREE_CODE (type) == ARRAY_TYPE
4662 && COMPLETE_TYPE_P (type)
4663 && TREE_OVERFLOW (TYPE_SIZE (type)))
4664 error ("size of array `%s' is too large", name);
4666 /* If this is declaring a typedef name, return a TYPE_DECL. */
4668 if (specbits & (1 << (int) RID_TYPEDEF))
4671 /* Note that the grammar rejects storage classes
4672 in typenames, fields or parameters */
4673 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4675 pedwarn ("ISO C forbids qualified function types");
4677 type = c_build_qualified_type (type, type_quals);
4678 decl = build_decl (TYPE_DECL, declarator, type);
4679 if ((specbits & (1 << (int) RID_SIGNED))
4680 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4681 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4685 /* Detect the case of an array type of unspecified size
4686 which came, as such, direct from a typedef name.
4687 We must copy the type, so that each identifier gets
4688 a distinct type, so that each identifier's size can be
4689 controlled separately by its own initializer. */
4691 if (type != 0 && typedef_type != 0
4692 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4693 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4695 type = build_array_type (TREE_TYPE (type), 0);
4697 C_TYPE_VARIABLE_SIZE (type) = 1;
4700 /* If this is a type name (such as, in a cast or sizeof),
4701 compute the type and return it now. */
4703 if (decl_context == TYPENAME)
4705 /* Note that the grammar rejects storage classes
4706 in typenames, fields or parameters */
4707 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4709 pedwarn ("ISO C forbids const or volatile function types");
4711 type = c_build_qualified_type (type, type_quals);
4715 /* Aside from typedefs and type names (handle above),
4716 `void' at top level (not within pointer)
4717 is allowed only in public variables.
4718 We don't complain about parms either, but that is because
4719 a better error message can be made later. */
4721 if (VOID_TYPE_P (type) && decl_context != PARM
4722 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4723 && ((specbits & (1 << (int) RID_EXTERN))
4724 || (current_binding_level == global_binding_level
4726 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4728 error ("variable or field `%s' declared void", name);
4729 type = integer_type_node;
4732 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4733 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4738 if (decl_context == PARM)
4740 tree type_as_written = type;
4743 /* A parameter declared as an array of T is really a pointer to T.
4744 One declared as a function is really a pointer to a function. */
4746 if (TREE_CODE (type) == ARRAY_TYPE)
4748 /* Transfer const-ness of array into that of type pointed to. */
4749 type = TREE_TYPE (type);
4751 type = c_build_qualified_type (type, type_quals);
4752 type = build_pointer_type (type);
4753 type_quals = TYPE_UNQUALIFIED;
4756 else if (TREE_CODE (type) == FUNCTION_TYPE)
4758 if (pedantic && type_quals)
4759 pedwarn ("ISO C forbids qualified function types");
4761 type = c_build_qualified_type (type, type_quals);
4762 type = build_pointer_type (type);
4763 type_quals = TYPE_UNQUALIFIED;
4766 decl = build_decl (PARM_DECL, declarator, type);
4768 C_DECL_VARIABLE_SIZE (decl) = 1;
4770 /* Compute the type actually passed in the parmlist,
4771 for the case where there is no prototype.
4772 (For example, shorts and chars are passed as ints.)
4773 When there is a prototype, this is overridden later. */
4775 if (type == error_mark_node)
4776 promoted_type = type;
4779 promoted_type = simple_type_promotes_to (type);
4780 if (! promoted_type)
4781 promoted_type = type;
4784 DECL_ARG_TYPE (decl) = promoted_type;
4785 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4787 else if (decl_context == FIELD)
4789 /* Structure field. It may not be a function. */
4791 if (TREE_CODE (type) == FUNCTION_TYPE)
4793 error ("field `%s' declared as a function", name);
4794 type = build_pointer_type (type);
4796 else if (TREE_CODE (type) != ERROR_MARK
4797 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4799 error ("field `%s' has incomplete type", name);
4800 type = error_mark_node;
4802 /* Move type qualifiers down to element of an array. */
4803 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4805 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4807 TYPE_DOMAIN (type));
4809 /* Leave the field const or volatile as well. */
4810 type_quals = TYPE_UNQUALIFIED;
4813 decl = build_decl (FIELD_DECL, declarator, type);
4814 DECL_NONADDRESSABLE_P (decl) = bitfield;
4817 C_DECL_VARIABLE_SIZE (decl) = 1;
4819 else if (TREE_CODE (type) == FUNCTION_TYPE)
4821 /* Every function declaration is "external"
4822 except for those which are inside a function body
4823 in which `auto' is used.
4824 That is a case not specified by ANSI C,
4825 and we use it for forward declarations for nested functions. */
4826 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4827 || current_binding_level == global_binding_level);
4829 if (specbits & (1 << (int) RID_AUTO)
4830 && (pedantic || current_binding_level == global_binding_level))
4831 pedwarn ("invalid storage class for function `%s'", name);
4832 if (specbits & (1 << (int) RID_REGISTER))
4833 error ("invalid storage class for function `%s'", name);
4834 /* Function declaration not at top level.
4835 Storage classes other than `extern' are not allowed
4836 and `extern' makes no difference. */
4837 if (current_binding_level != global_binding_level
4838 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4840 pedwarn ("invalid storage class for function `%s'", name);
4842 decl = build_decl (FUNCTION_DECL, declarator, type);
4843 decl = build_decl_attribute_variant (decl, decl_machine_attr);
4845 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4846 pedwarn ("ISO C forbids qualified function types");
4849 && VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl)))
4850 && TYPE_QUALS (TREE_TYPE (TREE_TYPE (decl)))
4851 && ! DECL_IN_SYSTEM_HEADER (decl))
4852 pedwarn ("ISO C forbids qualified void function return type");
4854 /* GNU C interprets a `volatile void' return type to indicate
4855 that the function does not return. */
4856 if ((type_quals & TYPE_QUAL_VOLATILE)
4857 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4858 warning ("`noreturn' function returns non-void value");
4861 DECL_EXTERNAL (decl) = 1;
4862 /* Record absence of global scope for `static' or `auto'. */
4864 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4866 /* Record presence of `inline', if it is reasonable. */
4869 if (MAIN_NAME_P (declarator))
4870 warning ("cannot inline function `main'");
4872 /* Assume that otherwise the function can be inlined. */
4873 DECL_INLINE (decl) = 1;
4875 if (specbits & (1 << (int) RID_EXTERN))
4876 current_extern_inline = 1;
4881 /* It's a variable. */
4882 /* An uninitialized decl with `extern' is a reference. */
4883 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4885 /* Move type qualifiers down to element of an array. */
4886 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4888 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4890 TYPE_DOMAIN (type));
4891 #if 0 /* Leave the variable const or volatile as well. */
4892 type_quals = TYPE_UNQUALIFIED;
4896 decl = build_decl (VAR_DECL, declarator, type);
4898 C_DECL_VARIABLE_SIZE (decl) = 1;
4901 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4903 DECL_EXTERNAL (decl) = extern_ref;
4904 /* At top level, the presence of a `static' or `register' storage
4905 class specifier, or the absence of all storage class specifiers
4906 makes this declaration a definition (perhaps tentative). Also,
4907 the absence of both `static' and `register' makes it public. */
4908 if (current_binding_level == global_binding_level)
4912 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
4913 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
4915 /* Not at top level, only `static' makes a static definition. */
4918 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4919 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
4923 /* Record `register' declaration for warnings on &
4924 and in case doing stupid register allocation. */
4926 if (specbits & (1 << (int) RID_REGISTER))
4927 DECL_REGISTER (decl) = 1;
4929 /* Record constancy and volatility. */
4930 c_apply_type_quals_to_decl (type_quals, decl);
4932 /* If a type has volatile components, it should be stored in memory.
4933 Otherwise, the fact that those components are volatile
4934 will be ignored, and would even crash the compiler. */
4935 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4936 mark_addressable (decl);
4942 /* Decode the parameter-list info for a function type or function definition.
4943 The argument is the value returned by `get_parm_info' (or made in parse.y
4944 if there is an identifier list instead of a parameter decl list).
4945 These two functions are separate because when a function returns
4946 or receives functions then each is called multiple times but the order
4947 of calls is different. The last call to `grokparms' is always the one
4948 that contains the formal parameter names of a function definition.
4950 Store in `last_function_parms' a chain of the decls of parms.
4951 Also store in `last_function_parm_tags' a chain of the struct, union,
4952 and enum tags declared among the parms.
4954 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4956 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4957 a mere declaration. A nonempty identifier-list gets an error message
4958 when FUNCDEF_FLAG is zero. */
4961 grokparms (parms_info, funcdef_flag)
4965 tree first_parm = TREE_CHAIN (parms_info);
4967 last_function_parms = TREE_PURPOSE (parms_info);
4968 last_function_parm_tags = TREE_VALUE (parms_info);
4970 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
4971 && !in_system_header)
4972 warning ("function declaration isn't a prototype");
4975 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
4978 pedwarn ("parameter names (without types) in function declaration");
4980 last_function_parms = first_parm;
4987 /* We no longer test FUNCDEF_FLAG.
4988 If the arg types are incomplete in a declaration,
4989 they must include undefined tags.
4990 These tags can never be defined in the scope of the declaration,
4991 so the types can never be completed,
4992 and no call can be compiled successfully. */
4994 /* In a fcn definition, arg types must be complete. */
4997 for (parm = last_function_parms, typelt = first_parm;
4999 parm = TREE_CHAIN (parm))
5000 /* Skip over any enumeration constants declared here. */
5001 if (TREE_CODE (parm) == PARM_DECL)
5003 /* Barf if the parameter itself has an incomplete type. */
5004 tree type = TREE_VALUE (typelt);
5005 if (!COMPLETE_TYPE_P (type))
5007 if (funcdef_flag && DECL_NAME (parm) != 0)
5008 error ("parameter `%s' has incomplete type",
5009 IDENTIFIER_POINTER (DECL_NAME (parm)));
5011 warning ("parameter has incomplete type");
5014 TREE_VALUE (typelt) = error_mark_node;
5015 TREE_TYPE (parm) = error_mark_node;
5019 /* This has been replaced by parm_tags_warning, which
5020 uses a more accurate criterion for what to warn
5024 /* Now warn if is a pointer to an incomplete type. */
5025 while (TREE_CODE (type) == POINTER_TYPE
5026 || TREE_CODE (type) == REFERENCE_TYPE)
5027 type = TREE_TYPE (type);
5028 type = TYPE_MAIN_VARIANT (type);
5029 if (!COMPLETE_TYPE_P (type))
5031 if (DECL_NAME (parm) != 0)
5032 warning ("parameter `%s' points to incomplete type",
5033 IDENTIFIER_POINTER (DECL_NAME (parm)));
5035 warning ("parameter points to incomplete type");
5039 typelt = TREE_CHAIN (typelt);
5046 /* Return a tree_list node with info on a parameter list just parsed.
5047 The TREE_PURPOSE is a chain of decls of those parms.
5048 The TREE_VALUE is a list of structure, union and enum tags defined.
5049 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5050 This tree_list node is later fed to `grokparms'.
5052 VOID_AT_END nonzero means append `void' to the end of the type-list.
5053 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5056 get_parm_info (void_at_end)
5059 register tree decl, t;
5060 register tree types = 0;
5062 tree tags = gettags ();
5063 tree parms = getdecls ();
5065 tree order = current_binding_level->parm_order;
5067 /* Just `void' (and no ellipsis) is special. There are really no parms.
5068 But if the `void' is qualified (by `const' or `volatile') or has a
5069 storage class specifier (`register'), then the behavior is undefined;
5070 by not counting it as the special case of `void' we will cause an
5071 error later. Typedefs for `void' are OK (see DR#157). */
5072 if (void_at_end && parms != 0
5073 && TREE_CHAIN (parms) == 0
5074 && VOID_TYPE_P (TREE_TYPE (parms))
5075 && ! TREE_THIS_VOLATILE (parms)
5076 && ! TREE_READONLY (parms)
5077 && ! DECL_REGISTER (parms)
5078 && DECL_NAME (parms) == 0)
5081 storedecls (NULL_TREE);
5082 return tree_cons (NULL_TREE, NULL_TREE,
5083 tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5086 /* Extract enumerator values and other non-parms declared with the parms.
5087 Likewise any forward parm decls that didn't have real parm decls. */
5088 for (decl = parms; decl;)
5090 tree next = TREE_CHAIN (decl);
5092 if (TREE_CODE (decl) != PARM_DECL)
5094 TREE_CHAIN (decl) = new_parms;
5097 else if (TREE_ASM_WRITTEN (decl))
5099 error_with_decl (decl,
5100 "parameter `%s' has just a forward declaration");
5101 TREE_CHAIN (decl) = new_parms;
5107 /* Put the parm decls back in the order they were in in the parm list. */
5108 for (t = order; t; t = TREE_CHAIN (t))
5111 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5113 TREE_CHAIN (TREE_VALUE (t)) = 0;
5116 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5119 /* Store the parmlist in the binding level since the old one
5120 is no longer a valid list. (We have changed the chain pointers.) */
5121 storedecls (new_parms);
5123 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5124 /* There may also be declarations for enumerators if an enumeration
5125 type is declared among the parms. Ignore them here. */
5126 if (TREE_CODE (decl) == PARM_DECL)
5128 /* Since there is a prototype,
5129 args are passed in their declared types. */
5130 tree type = TREE_TYPE (decl);
5131 DECL_ARG_TYPE (decl) = type;
5132 if (PROMOTE_PROTOTYPES
5133 && (TREE_CODE (type) == INTEGER_TYPE
5134 || TREE_CODE (type) == ENUMERAL_TYPE)
5135 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5136 DECL_ARG_TYPE (decl) = integer_type_node;
5138 types = tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5139 if (VOID_TYPE_P (TREE_VALUE (types)) && ! erred
5140 && DECL_NAME (decl) == 0)
5142 error ("`void' in parameter list must be the entire list");
5148 return tree_cons (new_parms, tags,
5149 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
5151 return tree_cons (new_parms, tags, nreverse (types));
5154 /* At end of parameter list, warn about any struct, union or enum tags
5155 defined within. Do so because these types cannot ever become complete. */
5158 parmlist_tags_warning ()
5163 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5165 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5166 /* An anonymous union parm type is meaningful as a GNU extension.
5167 So don't warn for that. */
5168 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5170 if (TREE_PURPOSE (elt) != 0)
5171 warning ("`%s %s' declared inside parameter list",
5172 (code == RECORD_TYPE ? "struct"
5173 : code == UNION_TYPE ? "union"
5175 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5178 /* For translation these need to be seperate warnings */
5179 if (code == RECORD_TYPE)
5180 warning ("anonymous struct declared inside parameter list");
5181 else if (code == UNION_TYPE)
5182 warning ("anonymous union declared inside parameter list");
5184 warning ("anonymous enum declared inside parameter list");
5188 warning ("its scope is only this definition or declaration, which is probably not what you want.");
5194 /* Get the struct, enum or union (CODE says which) with tag NAME.
5195 Define the tag as a forward-reference if it is not defined. */
5198 xref_tag (code, name)
5199 enum tree_code code;
5202 /* If a cross reference is requested, look up the type
5203 already defined for this tag and return it. */
5205 register tree ref = lookup_tag (code, name, current_binding_level, 0);
5206 /* Even if this is the wrong type of tag, return what we found.
5207 There will be an error message anyway, from pending_xref_error.
5208 If we create an empty xref just for an invalid use of the type,
5209 the main result is to create lots of superfluous error messages. */
5213 /* If no such tag is yet defined, create a forward-reference node
5214 and record it as the "definition".
5215 When a real declaration of this type is found,
5216 the forward-reference will be altered into a real type. */
5218 ref = make_node (code);
5219 if (code == ENUMERAL_TYPE)
5221 /* (In ANSI, Enums can be referred to only if already defined.) */
5223 pedwarn ("ISO C forbids forward references to `enum' types");
5224 /* Give the type a default layout like unsigned int
5225 to avoid crashing if it does not get defined. */
5226 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5227 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5228 TYPE_USER_ALIGN (ref) = 0;
5229 TREE_UNSIGNED (ref) = 1;
5230 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5231 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5232 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5235 pushtag (name, ref);
5240 /* Make sure that the tag NAME is defined *in the current binding level*
5241 at least as a forward reference.
5242 CODE says which kind of tag NAME ought to be. */
5245 start_struct (code, name)
5246 enum tree_code code;
5249 /* If there is already a tag defined at this binding level
5250 (as a forward reference), just return it. */
5252 register tree ref = 0;
5255 ref = lookup_tag (code, name, current_binding_level, 1);
5256 if (ref && TREE_CODE (ref) == code)
5258 C_TYPE_BEING_DEFINED (ref) = 1;
5259 TYPE_PACKED (ref) = flag_pack_struct;
5260 if (TYPE_FIELDS (ref))
5261 error ("redefinition of `%s %s'",
5262 code == UNION_TYPE ? "union" : "struct",
5263 IDENTIFIER_POINTER (name));
5268 /* Otherwise create a forward-reference just so the tag is in scope. */
5270 ref = make_node (code);
5271 pushtag (name, ref);
5272 C_TYPE_BEING_DEFINED (ref) = 1;
5273 TYPE_PACKED (ref) = flag_pack_struct;
5277 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5278 of a structure component, returning a FIELD_DECL node.
5279 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5281 This is done during the parsing of the struct declaration.
5282 The FIELD_DECL nodes are chained together and the lot of them
5283 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5286 grokfield (filename, line, declarator, declspecs, width)
5287 const char *filename ATTRIBUTE_UNUSED;
5288 int line ATTRIBUTE_UNUSED;
5289 tree declarator, declspecs, width;
5293 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5295 finish_decl (value, NULL_TREE, NULL_TREE);
5296 DECL_INITIAL (value) = width;
5298 maybe_objc_check_decl (value);
5302 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5303 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5304 ATTRIBUTES are attributes to be applied to the structure. */
5307 finish_struct (t, fieldlist, attributes)
5313 int toplevel = global_binding_level == current_binding_level;
5315 /* If this type was previously laid out as a forward reference,
5316 make sure we lay it out again. */
5320 decl_attributes (t, attributes, NULL_TREE);
5322 /* Nameless union parm types are useful as GCC extension. */
5323 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5324 /* Otherwise, warn about any struct or union def. in parmlist. */
5325 if (in_parm_level_p ())
5328 pedwarn ("%s defined inside parms",
5329 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5330 else if (! flag_traditional)
5331 warning ("%s defined inside parms",
5332 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5337 for (x = fieldlist; x; x = TREE_CHAIN (x))
5338 if (DECL_NAME (x) != 0)
5342 pedwarn ("%s has no %s",
5343 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
5344 fieldlist ? _("named members") : _("members"));
5347 /* Install struct as DECL_CONTEXT of each field decl.
5348 Also process specified field sizes,m which is found in the DECL_INITIAL.
5349 Store 0 there, except for ": 0" fields (so we can find them
5350 and delete them, below). */
5352 for (x = fieldlist; x; x = TREE_CHAIN (x))
5354 DECL_CONTEXT (x) = t;
5355 DECL_PACKED (x) |= TYPE_PACKED (t);
5357 /* If any field is const, the structure type is pseudo-const. */
5358 if (TREE_READONLY (x))
5359 C_TYPE_FIELDS_READONLY (t) = 1;
5362 /* A field that is pseudo-const makes the structure likewise. */
5363 tree t1 = TREE_TYPE (x);
5364 while (TREE_CODE (t1) == ARRAY_TYPE)
5365 t1 = TREE_TYPE (t1);
5366 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5367 && C_TYPE_FIELDS_READONLY (t1))
5368 C_TYPE_FIELDS_READONLY (t) = 1;
5371 /* Any field that is volatile means variables of this type must be
5372 treated in some ways as volatile. */
5373 if (TREE_THIS_VOLATILE (x))
5374 C_TYPE_FIELDS_VOLATILE (t) = 1;
5376 /* Any field of nominal variable size implies structure is too. */
5377 if (C_DECL_VARIABLE_SIZE (x))
5378 C_TYPE_VARIABLE_SIZE (t) = 1;
5380 /* Detect invalid nested redefinition. */
5381 if (TREE_TYPE (x) == t)
5382 error ("nested redefinition of `%s'",
5383 IDENTIFIER_POINTER (TYPE_NAME (t)));
5385 /* Detect invalid bit-field size. */
5386 if (DECL_INITIAL (x))
5387 STRIP_NOPS (DECL_INITIAL (x));
5388 if (DECL_INITIAL (x))
5390 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5391 constant_expression_warning (DECL_INITIAL (x));
5395 "bit-field `%s' width not an integer constant");
5396 DECL_INITIAL (x) = NULL;
5400 /* Detect invalid bit-field type. */
5401 if (DECL_INITIAL (x)
5402 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5403 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5405 error_with_decl (x, "bit-field `%s' has invalid type");
5406 DECL_INITIAL (x) = NULL;
5409 if (DECL_INITIAL (x) && pedantic
5410 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5411 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5412 /* Accept an enum that's equivalent to int or unsigned int. */
5413 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5414 && (TYPE_PRECISION (TREE_TYPE (x))
5415 == TYPE_PRECISION (integer_type_node))))
5416 pedwarn_with_decl (x, "bit-field `%s' type invalid in ISO C");
5418 /* Detect and ignore out of range field width and process valid
5420 if (DECL_INITIAL (x))
5422 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5423 error_with_decl (x, "negative width in bit-field `%s'");
5424 else if (0 < compare_tree_int (DECL_INITIAL (x),
5425 TYPE_PRECISION (TREE_TYPE (x))))
5426 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5427 else if (integer_zerop (DECL_INITIAL (x)) && DECL_NAME (x) != 0)
5428 error_with_decl (x, "zero width for bit-field `%s'");
5431 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
5432 unsigned HOST_WIDE_INT width
5433 = TREE_INT_CST_LOW (DECL_INITIAL (x));
5435 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5436 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5437 TREE_UNSIGNED (TREE_TYPE (x)))
5439 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5440 TREE_UNSIGNED (TREE_TYPE (x))))))
5441 warning_with_decl (x,
5442 "`%s' is narrower than values of its type");
5444 DECL_SIZE (x) = bitsize_int (width);
5445 DECL_BIT_FIELD (x) = DECL_C_BIT_FIELD (x) = 1;
5449 /* field size 0 => force desired amount of alignment. */
5450 #ifdef EMPTY_FIELD_BOUNDARY
5451 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5453 #ifdef PCC_BITFIELD_TYPE_MATTERS
5454 if (PCC_BITFIELD_TYPE_MATTERS)
5456 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5457 TYPE_ALIGN (TREE_TYPE (x)));
5458 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5465 else if (TREE_TYPE (x) != error_mark_node)
5467 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5468 : TYPE_ALIGN (TREE_TYPE (x)));
5470 /* Non-bit-fields are aligned for their type, except packed
5471 fields which require only BITS_PER_UNIT alignment. */
5472 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5473 if (! DECL_PACKED (x))
5474 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5477 DECL_INITIAL (x) = 0;
5480 /* Delete all duplicate fields from the fieldlist */
5481 for (x = fieldlist; x && TREE_CHAIN (x);)
5482 /* Anonymous fields aren't duplicates. */
5483 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5487 register tree y = fieldlist;
5491 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5497 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5499 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5500 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5506 /* Now we have the nearly final fieldlist. Record it,
5507 then lay out the structure or union (including the fields). */
5509 TYPE_FIELDS (t) = fieldlist;
5513 /* Delete all zero-width bit-fields from the fieldlist */
5515 tree *fieldlistp = &fieldlist;
5517 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5518 *fieldlistp = TREE_CHAIN (*fieldlistp);
5520 fieldlistp = &TREE_CHAIN (*fieldlistp);
5523 /* Now we have the truly final field list.
5524 Store it in this type and in the variants. */
5526 TYPE_FIELDS (t) = fieldlist;
5528 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5530 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5531 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5532 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5533 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5536 /* If this was supposed to be a transparent union, but we can't
5537 make it one, warn and turn off the flag. */
5538 if (TREE_CODE (t) == UNION_TYPE
5539 && TYPE_TRANSPARENT_UNION (t)
5540 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5542 TYPE_TRANSPARENT_UNION (t) = 0;
5543 warning ("union cannot be made transparent");
5546 /* If this structure or union completes the type of any previous
5547 variable declaration, lay it out and output its rtl. */
5549 if (current_binding_level->n_incomplete != 0)
5552 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5554 if (TREE_TYPE (decl) == t
5555 && TREE_CODE (decl) != TYPE_DECL)
5557 layout_decl (decl, 0);
5558 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5559 maybe_objc_check_decl (decl);
5560 rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0);
5563 --current_binding_level->n_incomplete;
5565 else if (!COMPLETE_TYPE_P (TREE_TYPE (decl))
5566 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5568 tree element = TREE_TYPE (decl);
5569 while (TREE_CODE (element) == ARRAY_TYPE)
5570 element = TREE_TYPE (element);
5572 layout_array_type (TREE_TYPE (decl));
5577 /* Finish debugging output for this type. */
5578 rest_of_type_compilation (t, toplevel);
5583 /* Lay out the type T, and its element type, and so on. */
5586 layout_array_type (t)
5589 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5590 layout_array_type (TREE_TYPE (t));
5594 /* Begin compiling the definition of an enumeration type.
5595 NAME is its name (or null if anonymous).
5596 Returns the type object, as yet incomplete.
5597 Also records info about it so that build_enumerator
5598 may be used to declare the individual values as they are read. */
5604 register tree enumtype = 0;
5606 /* If this is the real definition for a previous forward reference,
5607 fill in the contents in the same object that used to be the
5608 forward reference. */
5611 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5613 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5615 enumtype = make_node (ENUMERAL_TYPE);
5616 pushtag (name, enumtype);
5619 C_TYPE_BEING_DEFINED (enumtype) = 1;
5621 if (TYPE_VALUES (enumtype) != 0)
5623 /* This enum is a named one that has been declared already. */
5624 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5626 /* Completely replace its old definition.
5627 The old enumerators remain defined, however. */
5628 TYPE_VALUES (enumtype) = 0;
5631 enum_next_value = integer_zero_node;
5634 if (flag_short_enums)
5635 TYPE_PACKED (enumtype) = 1;
5640 /* After processing and defining all the values of an enumeration type,
5641 install their decls in the enumeration type and finish it off.
5642 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5643 and ATTRIBUTES are the specified attributes.
5644 Returns ENUMTYPE. */
5647 finish_enum (enumtype, values, attributes)
5652 register tree pair, tem;
5653 tree minnode = 0, maxnode = 0, enum_value_type;
5654 int precision, unsign;
5655 int toplevel = (global_binding_level == current_binding_level);
5657 if (in_parm_level_p ())
5658 warning ("enum defined inside parms");
5660 decl_attributes (enumtype, attributes, NULL_TREE);
5662 /* Calculate the maximum value of any enumerator in this type. */
5664 if (values == error_mark_node)
5665 minnode = maxnode = integer_zero_node;
5668 minnode = maxnode = TREE_VALUE (values);
5669 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5671 tree value = TREE_VALUE (pair);
5672 if (tree_int_cst_lt (maxnode, value))
5674 if (tree_int_cst_lt (value, minnode))
5679 /* Construct the final type of this enumeration. It is the same
5680 as one of the integral types - the narrowest one that fits, except
5681 that normally we only go as narrow as int - and signed iff any of
5682 the values are negative. */
5683 unsign = (tree_int_cst_sgn (minnode) >= 0);
5684 precision = MAX (min_precision (minnode, unsign),
5685 min_precision (maxnode, unsign));
5686 if (!TYPE_PACKED (enumtype))
5687 precision = MAX (precision, TYPE_PRECISION (integer_type_node));
5688 if (type_for_size (precision, unsign) == 0)
5690 warning ("enumeration values exceed range of largest integer");
5691 precision = TYPE_PRECISION (long_long_integer_type_node);
5694 if (precision == TYPE_PRECISION (integer_type_node))
5695 enum_value_type = type_for_size (precision, 0);
5697 enum_value_type = enumtype;
5699 TYPE_MIN_VALUE (enumtype) = minnode;
5700 TYPE_MAX_VALUE (enumtype) = maxnode;
5701 TYPE_PRECISION (enumtype) = precision;
5702 TREE_UNSIGNED (enumtype) = unsign;
5703 TYPE_SIZE (enumtype) = 0;
5704 layout_type (enumtype);
5706 if (values != error_mark_node)
5708 /* Change the type of the enumerators to be the enum type. We
5709 need to do this irrespective of the size of the enum, for
5710 proper type checking. Replace the DECL_INITIALs of the
5711 enumerators, and the value slots of the list, with copies
5712 that have the enum type; they cannot be modified in place
5713 because they may be shared (e.g. integer_zero_node) Finally,
5714 change the purpose slots to point to the names of the decls. */
5715 for (pair = values; pair; pair = TREE_CHAIN (pair))
5717 tree enu = TREE_PURPOSE (pair);
5719 TREE_TYPE (enu) = enumtype;
5720 DECL_SIZE (enu) = TYPE_SIZE (enumtype);
5721 DECL_SIZE_UNIT (enu) = TYPE_SIZE_UNIT (enumtype);
5722 DECL_ALIGN (enu) = TYPE_ALIGN (enumtype);
5723 DECL_USER_ALIGN (enu) = TYPE_USER_ALIGN (enumtype);
5724 DECL_MODE (enu) = TYPE_MODE (enumtype);
5726 /* The ISO C Standard mandates enumerators to have type int,
5727 even though the underlying type of an enum type is
5728 unspecified. Here we convert any enumerators that fit in
5729 an int to type int, to avoid promotions to unsigned types
5730 when comparing integers with enumerators that fit in the
5731 int range. When -pedantic is given, build_enumerator()
5732 would have already taken care of those that don't fit. */
5733 if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
5734 DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
5736 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5738 TREE_PURPOSE (pair) = DECL_NAME (enu);
5739 TREE_VALUE (pair) = DECL_INITIAL (enu);
5742 TYPE_VALUES (enumtype) = values;
5745 /* Fix up all variant types of this enum type. */
5746 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5748 if (tem == enumtype)
5750 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5751 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5752 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5753 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5754 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5755 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5756 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5757 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5758 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5759 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5762 /* Finish debugging output for this type. */
5763 rest_of_type_compilation (enumtype, toplevel);
5768 /* Build and install a CONST_DECL for one value of the
5769 current enumeration type (one that was begun with start_enum).
5770 Return a tree-list containing the CONST_DECL and its value.
5771 Assignment of sequential values by default is handled here. */
5774 build_enumerator (name, value)
5777 register tree decl, type;
5779 /* Validate and default VALUE. */
5781 /* Remove no-op casts from the value. */
5783 STRIP_TYPE_NOPS (value);
5787 if (TREE_CODE (value) == INTEGER_CST)
5789 value = default_conversion (value);
5790 constant_expression_warning (value);
5794 error ("enumerator value for `%s' not integer constant",
5795 IDENTIFIER_POINTER (name));
5800 /* Default based on previous value. */
5801 /* It should no longer be possible to have NON_LVALUE_EXPR
5805 value = enum_next_value;
5807 error ("overflow in enumeration values");
5810 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5812 pedwarn ("ISO C restricts enumerator values to range of `int'");
5813 value = convert (integer_type_node, value);
5816 /* Set basis for default for next value. */
5817 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5818 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5820 /* Now create a declaration for the enum value name. */
5822 type = TREE_TYPE (value);
5823 type = type_for_size (MAX (TYPE_PRECISION (type),
5824 TYPE_PRECISION (integer_type_node)),
5826 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
5827 && TREE_UNSIGNED (type)));
5829 decl = build_decl (CONST_DECL, name, type);
5830 DECL_INITIAL (decl) = convert (type, value);
5833 return tree_cons (decl, value, NULL_TREE);
5837 /* Create the FUNCTION_DECL for a function definition.
5838 DECLSPECS, DECLARATOR, PREFIX_ATTRIBUTES and ATTRIBUTES are the parts of
5839 the declaration; they describe the function's name and the type it returns,
5840 but twisted together in a fashion that parallels the syntax of C.
5842 This function creates a binding context for the function body
5843 as well as setting up the FUNCTION_DECL in current_function_decl.
5845 Returns 1 on success. If the DECLARATOR is not suitable for a function
5846 (it defines a datum instead), we return 0, which tells
5847 yyparse to report a parse error. */
5850 start_function (declspecs, declarator, prefix_attributes, attributes)
5851 tree declarator, declspecs, prefix_attributes, attributes;
5853 tree decl1, old_decl;
5855 int old_immediate_size_expand = immediate_size_expand;
5857 current_function_returns_value = 0; /* Assume, until we see it does. */
5858 current_function_returns_null = 0;
5859 warn_about_return_type = 0;
5860 current_extern_inline = 0;
5861 c_function_varargs = 0;
5863 shadowed_labels = 0;
5865 /* Don't expand any sizes in the return type of the function. */
5866 immediate_size_expand = 0;
5868 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
5870 /* If the declarator is not suitable for a function definition,
5871 cause a syntax error. */
5874 immediate_size_expand = old_immediate_size_expand;
5878 decl_attributes (decl1, prefix_attributes, attributes);
5880 announce_function (decl1);
5882 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5884 error ("return type is an incomplete type");
5885 /* Make it return void instead. */
5887 = build_function_type (void_type_node,
5888 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5891 if (warn_about_return_type)
5892 pedwarn_c99 ("return type defaults to `int'");
5894 /* Save the parm names or decls from this function's declarator
5895 where store_parm_decls will find them. */
5896 current_function_parms = last_function_parms;
5897 current_function_parm_tags = last_function_parm_tags;
5899 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5900 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5901 DECL_INITIAL (decl1) = error_mark_node;
5903 /* If this definition isn't a prototype and we had a prototype declaration
5904 before, copy the arg type info from that prototype.
5905 But not if what we had before was a builtin function. */
5906 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5907 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5908 && !DECL_BUILT_IN (old_decl)
5909 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5910 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5911 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5913 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5914 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
5915 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
5918 /* If there is no explicit declaration, look for any out-of-scope implicit
5921 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
5923 /* Optionally warn of old-fashioned def with no previous prototype. */
5924 if (warn_strict_prototypes
5925 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5926 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
5927 warning ("function declaration isn't a prototype");
5928 /* Optionally warn of any global def with no previous prototype. */
5929 else if (warn_missing_prototypes
5930 && TREE_PUBLIC (decl1)
5931 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0)
5932 && ! MAIN_NAME_P (DECL_NAME (decl1)))
5933 warning_with_decl (decl1, "no previous prototype for `%s'");
5934 /* Optionally warn of any def with no previous prototype
5935 if the function has already been used. */
5936 else if (warn_missing_prototypes
5937 && old_decl != 0 && TREE_USED (old_decl)
5938 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5939 warning_with_decl (decl1,
5940 "`%s' was used with no prototype before its definition");
5941 /* Optionally warn of any global def with no previous declaration. */
5942 else if (warn_missing_declarations
5943 && TREE_PUBLIC (decl1)
5945 && ! MAIN_NAME_P (DECL_NAME (decl1)))
5946 warning_with_decl (decl1, "no previous declaration for `%s'");
5947 /* Optionally warn of any def with no previous declaration
5948 if the function has already been used. */
5949 else if (warn_missing_declarations
5950 && old_decl != 0 && TREE_USED (old_decl)
5951 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
5952 warning_with_decl (decl1,
5953 "`%s' was used with no declaration before its definition");
5955 /* This is a definition, not a reference.
5956 So normally clear DECL_EXTERNAL.
5957 However, `extern inline' acts like a declaration
5958 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5959 DECL_EXTERNAL (decl1) = current_extern_inline;
5961 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
5962 SET_DEFAULT_DECL_ATTRIBUTES (decl1, attributes);
5965 /* This function exists in static storage.
5966 (This does not mean `static' in the C sense!) */
5967 TREE_STATIC (decl1) = 1;
5969 /* A nested function is not global. */
5970 if (current_function_decl != 0)
5971 TREE_PUBLIC (decl1) = 0;
5973 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5974 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
5979 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5980 != integer_type_node)
5981 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
5983 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
5984 args = TREE_CHAIN (args))
5986 tree type = args ? TREE_VALUE (args) : 0;
5988 if (type == void_type_node)
5995 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
5996 pedwarn_with_decl (decl1,
5997 "first argument of `%s' should be `int'");
6001 if (TREE_CODE (type) != POINTER_TYPE
6002 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6003 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6005 pedwarn_with_decl (decl1,
6006 "second argument of `%s' should be `char **'");
6010 if (TREE_CODE (type) != POINTER_TYPE
6011 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6012 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6014 pedwarn_with_decl (decl1,
6015 "third argument of `%s' should probably be `char **'");
6020 /* It is intentional that this message does not mention the third
6021 argument, which is warned for only pedantically, because it's
6022 blessed by mention in an appendix of the standard. */
6023 if (argct > 0 && (argct < 2 || argct > 3))
6024 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
6026 if (argct == 3 && pedantic)
6027 pedwarn_with_decl (decl1, "third argument of `%s' is deprecated");
6029 if (! TREE_PUBLIC (decl1))
6030 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
6033 /* Record the decl so that the function name is defined.
6034 If we already have a decl for this name, and it is a FUNCTION_DECL,
6035 use the old decl. */
6037 current_function_decl = pushdecl (decl1);
6040 declare_parm_level (1);
6041 current_binding_level->subblocks_tag_transparent = 1;
6043 make_function_rtl (current_function_decl);
6045 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6046 /* Promote the value to int before returning it. */
6047 if (C_PROMOTING_INTEGER_TYPE_P (restype))
6049 /* It retains unsignedness if traditional
6050 or if not really getting wider. */
6051 if (TREE_UNSIGNED (restype)
6052 && (flag_traditional
6053 || (TYPE_PRECISION (restype)
6054 == TYPE_PRECISION (integer_type_node))))
6055 restype = unsigned_type_node;
6057 restype = integer_type_node;
6059 DECL_RESULT (current_function_decl)
6060 = build_decl (RESULT_DECL, NULL_TREE, restype);
6062 /* If this fcn was already referenced via a block-scope `extern' decl
6063 (or an implicit decl), propagate certain information about the usage. */
6064 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6065 TREE_ADDRESSABLE (current_function_decl) = 1;
6067 immediate_size_expand = old_immediate_size_expand;
6072 /* Record that this function is going to be a varargs function.
6073 This is called before store_parm_decls, which is too early
6074 to call mark_varargs directly. */
6079 c_function_varargs = 1;
6082 /* Store the parameter declarations into the current function declaration.
6083 This is called after parsing the parameter declarations, before
6084 digesting the body of the function.
6086 For an old-style definition, modify the function's type
6087 to specify at least the number of arguments. */
6092 register tree fndecl = current_function_decl;
6095 /* This is either a chain of PARM_DECLs (if a prototype was used)
6096 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6097 tree specparms = current_function_parms;
6099 /* This is a list of types declared among parms in a prototype. */
6100 tree parmtags = current_function_parm_tags;
6102 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6103 register tree parmdecls = getdecls ();
6105 /* This is a chain of any other decls that came in among the parm
6106 declarations. If a parm is declared with enum {foo, bar} x;
6107 then CONST_DECLs for foo and bar are put here. */
6110 /* Nonzero if this definition is written with a prototype. */
6113 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6115 /* This case is when the function was defined with an ANSI prototype.
6116 The parms already have decls, so we need not do anything here
6117 except record them as in effect
6118 and complain if any redundant old-style parm decls were written. */
6129 error_with_decl (fndecl,
6130 "parm types given both in parmlist and separately");
6131 /* Get rid of the erroneous decls; don't keep them on
6132 the list of parms, since they might not be PARM_DECLs. */
6133 for (decl = current_binding_level->names;
6134 decl; decl = TREE_CHAIN (decl))
6135 if (DECL_NAME (decl))
6136 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6137 for (link = current_binding_level->shadowed;
6138 link; link = TREE_CHAIN (link))
6139 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6140 current_binding_level->names = 0;
6141 current_binding_level->shadowed = 0;
6144 specparms = nreverse (specparms);
6145 for (parm = specparms; parm; parm = next)
6147 next = TREE_CHAIN (parm);
6148 if (TREE_CODE (parm) == PARM_DECL)
6150 if (DECL_NAME (parm) == 0)
6151 error_with_decl (parm, "parameter name omitted");
6152 else if (TREE_CODE (TREE_TYPE (parm)) != ERROR_MARK
6153 && VOID_TYPE_P (TREE_TYPE (parm)))
6155 error_with_decl (parm, "parameter `%s' declared void");
6156 /* Change the type to error_mark_node so this parameter
6157 will be ignored by assign_parms. */
6158 TREE_TYPE (parm) = error_mark_node;
6164 /* If we find an enum constant or a type tag,
6165 put it aside for the moment. */
6166 TREE_CHAIN (parm) = 0;
6167 others = chainon (others, parm);
6171 /* Get the decls in their original chain order
6172 and record in the function. */
6173 DECL_ARGUMENTS (fndecl) = getdecls ();
6176 /* If this function takes a variable number of arguments,
6177 add a phony parameter to the end of the parm list,
6178 to represent the position of the first unnamed argument. */
6179 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6182 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6183 /* Let's hope the address of the unnamed parm
6184 won't depend on its type. */
6185 TREE_TYPE (dummy) = integer_type_node;
6186 DECL_ARG_TYPE (dummy) = integer_type_node;
6187 DECL_ARGUMENTS (fndecl) = chainon (DECL_ARGUMENTS (fndecl), dummy);
6191 /* Now pushdecl the enum constants. */
6192 for (parm = others; parm; parm = next)
6194 next = TREE_CHAIN (parm);
6195 if (DECL_NAME (parm) == 0)
6197 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6199 else if (TREE_CODE (parm) != PARM_DECL)
6203 storetags (chainon (parmtags, gettags ()));
6207 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6208 each with a parm name as the TREE_VALUE.
6210 PARMDECLS is a chain of declarations for parameters.
6211 Warning! It can also contain CONST_DECLs which are not parameters
6212 but are names of enumerators of any enum types
6213 declared among the parameters.
6215 First match each formal parameter name with its declaration.
6216 Associate decls with the names and store the decls
6217 into the TREE_PURPOSE slots. */
6219 /* We use DECL_WEAK as a flag to show which parameters have been
6220 seen already since it is not used on PARM_DECL or CONST_DECL. */
6221 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6222 DECL_WEAK (parm) = 0;
6224 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6226 register tree tail, found = NULL;
6228 if (TREE_VALUE (parm) == 0)
6230 error_with_decl (fndecl,
6231 "parameter name missing from parameter list");
6232 TREE_PURPOSE (parm) = 0;
6236 /* See if any of the parmdecls specifies this parm by name.
6237 Ignore any enumerator decls. */
6238 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6239 if (DECL_NAME (tail) == TREE_VALUE (parm)
6240 && TREE_CODE (tail) == PARM_DECL)
6246 /* If declaration already marked, we have a duplicate name.
6247 Complain, and don't use this decl twice. */
6248 if (found && DECL_WEAK (found))
6250 error_with_decl (found, "multiple parameters named `%s'");
6254 /* If the declaration says "void", complain and ignore it. */
6255 if (found && VOID_TYPE_P (TREE_TYPE (found)))
6257 error_with_decl (found, "parameter `%s' declared void");
6258 TREE_TYPE (found) = integer_type_node;
6259 DECL_ARG_TYPE (found) = integer_type_node;
6260 layout_decl (found, 0);
6263 /* Traditionally, a parm declared float is actually a double. */
6264 if (found && flag_traditional
6265 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6267 TREE_TYPE (found) = double_type_node;
6268 DECL_ARG_TYPE (found) = double_type_node;
6269 layout_decl (found, 0);
6272 /* If no declaration found, default to int. */
6275 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6277 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6278 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6279 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6281 pedwarn_with_decl (found, "type of `%s' defaults to `int'");
6282 else if (extra_warnings)
6283 warning_with_decl (found, "type of `%s' defaults to `int'");
6287 TREE_PURPOSE (parm) = found;
6289 /* Mark this decl as "already found". */
6290 DECL_WEAK (found) = 1;
6293 /* Put anything which is on the parmdecls chain and which is
6294 not a PARM_DECL onto the list NONPARMS. (The types of
6295 non-parm things which might appear on the list include
6296 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6297 any actual PARM_DECLs not matched with any names. */
6300 for (parm = parmdecls; parm;)
6302 tree next = TREE_CHAIN (parm);
6303 TREE_CHAIN (parm) = 0;
6305 if (TREE_CODE (parm) != PARM_DECL)
6306 nonparms = chainon (nonparms, parm);
6309 /* Complain about args with incomplete types. */
6310 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6312 error_with_decl (parm, "parameter `%s' has incomplete type");
6313 TREE_TYPE (parm) = error_mark_node;
6316 if (! DECL_WEAK (parm))
6318 error_with_decl (parm,
6319 "declaration for parameter `%s' but no such parameter");
6320 /* Pretend the parameter was not missing.
6321 This gets us to a standard state and minimizes
6322 further error messages. */
6324 = chainon (specparms,
6325 tree_cons (parm, NULL_TREE, NULL_TREE));
6332 /* Chain the declarations together in the order of the list of
6333 names. Store that chain in the function decl, replacing the
6336 DECL_ARGUMENTS (fndecl) = 0;
6339 for (last = 0; parm; parm = TREE_CHAIN (parm))
6340 if (TREE_PURPOSE (parm))
6343 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6345 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6346 last = TREE_PURPOSE (parm);
6347 TREE_CHAIN (last) = 0;
6351 /* If there was a previous prototype,
6352 set the DECL_ARG_TYPE of each argument according to
6353 the type previously specified, and report any mismatches. */
6355 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6358 for (parm = DECL_ARGUMENTS (fndecl),
6359 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6360 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6361 != void_type_node));
6362 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6364 if (parm == 0 || type == 0
6365 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6367 error ("number of arguments doesn't match prototype");
6368 error_with_file_and_line (current_function_prototype_file,
6369 current_function_prototype_line,
6370 "prototype declaration");
6373 /* Type for passing arg must be consistent
6374 with that declared for the arg. */
6375 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
6377 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6378 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6380 /* Adjust argument to match prototype. E.g. a previous
6381 `int foo(float);' prototype causes
6382 `int foo(x) float x; {...}' to be treated like
6383 `int foo(float x) {...}'. This is particularly
6384 useful for argument types like uid_t. */
6385 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6387 if (PROMOTE_PROTOTYPES
6388 && (TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
6389 || TREE_CODE (TREE_TYPE (parm)) == ENUMERAL_TYPE)
6390 && TYPE_PRECISION (TREE_TYPE (parm))
6391 < TYPE_PRECISION (integer_type_node))
6392 DECL_ARG_TYPE (parm) = integer_type_node;
6396 pedwarn ("promoted argument `%s' doesn't match prototype",
6397 IDENTIFIER_POINTER (DECL_NAME (parm)));
6398 warning_with_file_and_line
6399 (current_function_prototype_file,
6400 current_function_prototype_line,
6401 "prototype declaration");
6404 /* If -traditional, allow `int' argument to match
6405 `unsigned' prototype. */
6406 else if (! (flag_traditional
6407 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6408 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6410 error ("argument `%s' doesn't match prototype",
6411 IDENTIFIER_POINTER (DECL_NAME (parm)));
6412 error_with_file_and_line (current_function_prototype_file,
6413 current_function_prototype_line,
6414 "prototype declaration");
6418 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6421 /* Otherwise, create a prototype that would match. */
6425 tree actual = 0, last = 0, type;
6427 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6429 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6431 TREE_CHAIN (last) = type;
6436 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6438 TREE_CHAIN (last) = type;
6442 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6443 of the type of this function, but we need to avoid having this
6444 affect the types of other similarly-typed functions, so we must
6445 first force the generation of an identical (but separate) type
6446 node for the relevant function type. The new node we create
6447 will be a variant of the main variant of the original function
6450 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6452 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6455 /* Now store the final chain of decls for the arguments
6456 as the decl-chain of the current lexical scope.
6457 Put the enumerators in as well, at the front so that
6458 DECL_ARGUMENTS is not modified. */
6460 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6463 /* Make sure the binding level for the top of the function body
6464 gets a BLOCK if there are any in the function.
6465 Otherwise, the dbx output is wrong. */
6467 keep_next_if_subblocks = 1;
6469 /* ??? This might be an improvement,
6470 but needs to be thought about some more. */
6472 keep_next_level_flag = 1;
6475 /* Write a record describing this function definition to the prototypes
6476 file (if requested). */
6478 gen_aux_info_record (fndecl, 1, 0, prototype);
6480 /* Initialize the RTL code for the function. */
6482 init_function_start (fndecl, input_filename, lineno);
6484 /* Begin the statement tree for this function. */
6485 DECL_LANG_SPECIFIC (current_function_decl)
6486 =((struct lang_decl *) ggc_alloc (sizeof (struct lang_decl)));
6487 begin_stmt_tree (&DECL_SAVED_TREE (current_function_decl));
6489 /* This function is being processed in whole-function mode. */
6490 cfun->x_whole_function_mode_p = 1;
6492 /* Even though we're inside a function body, we still don't want to
6493 call expand_expr to calculate the size of a variable-sized array.
6494 We haven't necessarily assigned RTL to all variables yet, so it's
6495 not safe to try to expand expressions involving them. */
6496 immediate_size_expand = 0;
6497 cfun->x_dont_save_pending_sizes_p = 1;
6500 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6501 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6502 stands for an ellipsis in the identifier list.
6504 PARMLIST is the data returned by get_parm_info for the
6505 parmlist that follows the semicolon.
6507 We return a value of the same sort that get_parm_info returns,
6508 except that it describes the combination of identifiers and parmlist. */
6511 combine_parm_decls (specparms, parmlist, void_at_end)
6512 tree specparms, parmlist;
6515 register tree fndecl = current_function_decl;
6518 tree parmdecls = TREE_PURPOSE (parmlist);
6520 /* This is a chain of any other decls that came in among the parm
6521 declarations. They were separated already by get_parm_info,
6522 so we just need to keep them separate. */
6523 tree nonparms = TREE_VALUE (parmlist);
6527 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6528 DECL_WEAK (parm) = 0;
6530 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6532 register tree tail, found = NULL;
6534 /* See if any of the parmdecls specifies this parm by name. */
6535 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6536 if (DECL_NAME (tail) == TREE_VALUE (parm))
6542 /* If declaration already marked, we have a duplicate name.
6543 Complain, and don't use this decl twice. */
6544 if (found && DECL_WEAK (found))
6546 error_with_decl (found, "multiple parameters named `%s'");
6550 /* If the declaration says "void", complain and ignore it. */
6551 if (found && VOID_TYPE_P (TREE_TYPE (found)))
6553 error_with_decl (found, "parameter `%s' declared void");
6554 TREE_TYPE (found) = integer_type_node;
6555 DECL_ARG_TYPE (found) = integer_type_node;
6556 layout_decl (found, 0);
6559 /* Traditionally, a parm declared float is actually a double. */
6560 if (found && flag_traditional
6561 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6563 TREE_TYPE (found) = double_type_node;
6564 DECL_ARG_TYPE (found) = double_type_node;
6565 layout_decl (found, 0);
6568 /* If no declaration found, default to int. */
6571 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6573 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6574 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6575 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6576 error_with_decl (found, "type of parameter `%s' is not declared");
6580 TREE_PURPOSE (parm) = found;
6582 /* Mark this decl as "already found". */
6583 DECL_WEAK (found) = 1;
6586 /* Complain about any actual PARM_DECLs not matched with any names. */
6588 for (parm = parmdecls; parm;)
6590 tree next = TREE_CHAIN (parm);
6591 TREE_CHAIN (parm) = 0;
6593 /* Complain about args with incomplete types. */
6594 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6596 error_with_decl (parm, "parameter `%s' has incomplete type");
6597 TREE_TYPE (parm) = error_mark_node;
6600 if (! DECL_WEAK (parm))
6602 error_with_decl (parm,
6603 "declaration for parameter `%s' but no such parameter");
6604 /* Pretend the parameter was not missing.
6605 This gets us to a standard state and minimizes
6606 further error messages. */
6608 = chainon (specparms,
6609 tree_cons (parm, NULL_TREE, NULL_TREE));
6615 /* Chain the declarations together in the order of the list of names.
6616 At the same time, build up a list of their types, in reverse order. */
6622 for (last = 0; parm; parm = TREE_CHAIN (parm))
6623 if (TREE_PURPOSE (parm))
6626 parmdecls = TREE_PURPOSE (parm);
6628 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6629 last = TREE_PURPOSE (parm);
6630 TREE_CHAIN (last) = 0;
6632 types = tree_cons (NULL_TREE, TREE_TYPE (parm), types);
6637 return tree_cons (parmdecls, nonparms,
6638 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
6640 return tree_cons (parmdecls, nonparms, nreverse (types));
6643 /* Finish up a function declaration and compile that function
6644 all the way to assembler language output. The free the storage
6645 for the function definition.
6647 This is called after parsing the body of the function definition.
6649 NESTED is nonzero if the function being finished is nested in another. */
6652 finish_function (nested)
6655 register tree fndecl = current_function_decl;
6657 /* TREE_READONLY (fndecl) = 1;
6658 This caused &foo to be of type ptr-to-const-function
6659 which then got a warning when stored in a ptr-to-function variable. */
6662 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6664 /* Must mark the RESULT_DECL as being in this function. */
6666 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6668 /* Obey `register' declarations if `setjmp' is called in this fn. */
6669 if (flag_traditional && current_function_calls_setjmp)
6671 setjmp_protect (DECL_INITIAL (fndecl));
6672 setjmp_protect_args ();
6675 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6677 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6678 != integer_type_node)
6680 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6681 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6683 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
6687 #ifdef DEFAULT_MAIN_RETURN
6688 /* Make it so that `main' always returns success by default. */
6689 DEFAULT_MAIN_RETURN;
6692 c_expand_return (integer_zero_node);
6697 /* Tie off the statement tree for this function. */
6698 finish_stmt_tree (&DECL_SAVED_TREE (fndecl));
6699 /* Clear out memory we no longer need. */
6700 free_after_parsing (cfun);
6701 /* Since we never call rest_of_compilation, we never clear
6702 CFUN. Do so explicitly. */
6703 free_after_compilation (cfun);
6708 /* Generate RTL for the body of this function. */
6709 c_expand_body (fndecl, nested);
6710 /* Let the error reporting routines know that we're outside a
6711 function. For a nested function, this value is used in
6712 pop_c_function_context and then reset via pop_function_context. */
6713 current_function_decl = NULL;
6717 /* Generate the RTL for the body of FNDECL. If NESTED_P is non-zero,
6718 then we are already in the process of generating RTL for another
6722 c_expand_body (fndecl, nested_p)
6726 /* There's no reason to do any of the work here if we're only doing
6727 semantic analysis; this code just generates RTL. */
6728 if (flag_syntax_only)
6731 /* Squirrel away our current state. */
6733 push_function_context ();
6735 /* Initialize the RTL code for the function. */
6736 current_function_decl = fndecl;
6737 init_function_start (fndecl, input_filename, lineno);
6739 /* This function is being processed in whole-function mode. */
6740 cfun->x_whole_function_mode_p = 1;
6742 /* Even though we're inside a function body, we still don't want to
6743 call expand_expr to calculate the size of a variable-sized array.
6744 We haven't necessarily assigned RTL to all variables yet, so it's
6745 not safe to try to expand expressions involving them. */
6746 immediate_size_expand = 0;
6747 cfun->x_dont_save_pending_sizes_p = 1;
6749 /* If this is a varargs function, inform function.c. */
6750 if (c_function_varargs)
6753 /* Set up parameters and prepare for return, for the function. */
6754 expand_function_start (fndecl, 0);
6756 /* If this function is `main', emit a call to `__main'
6757 to run global initializers, etc. */
6758 if (DECL_NAME (fndecl)
6759 && MAIN_NAME_P (DECL_NAME (fndecl))
6760 && DECL_CONTEXT (fndecl) == NULL_TREE)
6761 expand_main_function ();
6763 /* Generate the RTL for this function. */
6764 expand_stmt (DECL_SAVED_TREE (fndecl));
6765 /* Allow the body of the function to be garbage collected. */
6766 DECL_SAVED_TREE (fndecl) = NULL_TREE;
6768 /* We hard-wired immediate_size_expand to zero in start_function.
6769 expand_function_end will decrement this variable. So, we set the
6770 variable to one here, so that after the decrement it will remain
6772 immediate_size_expand = 1;
6774 /* Allow language dialects to perform special processing. */
6775 if (lang_expand_function_end)
6776 (*lang_expand_function_end) ();
6778 /* Generate rtl for function exit. */
6779 expand_function_end (input_filename, lineno, 0);
6781 /* If this is a nested function, protect the local variables in the stack
6782 above us from being collected while we're compiling this function. */
6784 ggc_push_context ();
6786 /* Run the optimizers and output the assembler code for this function. */
6787 rest_of_compilation (fndecl);
6789 /* Undo the GC context switch. */
6793 /* With just -W, complain only if function returns both with
6794 and without a value. */
6796 && current_function_returns_value
6797 && current_function_returns_null)
6798 warning ("this function may return with or without a value");
6800 /* If requested, warn about function definitions where the function will
6801 return a value (usually of some struct or union type) which itself will
6802 take up a lot of stack space. */
6804 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6806 tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6808 if (ret_type && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST
6809 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type),
6812 unsigned int size_as_int
6813 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type));
6815 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0)
6816 warning_with_decl (fndecl,
6817 "size of return value of `%s' is %u bytes",
6820 warning_with_decl (fndecl,
6821 "size of return value of `%s' is larger than %d bytes",
6826 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested_p)
6828 /* Stop pointing to the local nodes about to be freed.
6829 But DECL_INITIAL must remain nonzero so we know this
6830 was an actual function definition.
6831 For a nested function, this is done in pop_c_function_context.
6832 If rest_of_compilation set this to 0, leave it 0. */
6833 if (DECL_INITIAL (fndecl) != 0)
6834 DECL_INITIAL (fndecl) = error_mark_node;
6836 DECL_ARGUMENTS (fndecl) = 0;
6839 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6841 #ifndef ASM_OUTPUT_CONSTRUCTOR
6842 if (! flag_gnu_linker)
6843 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6846 assemble_constructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl)));
6849 if (DECL_STATIC_DESTRUCTOR (fndecl))
6851 #ifndef ASM_OUTPUT_DESTRUCTOR
6852 if (! flag_gnu_linker)
6853 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6856 assemble_destructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl)));
6861 /* Return to the enclosing function. */
6862 pop_function_context ();
6863 /* If the nested function was inline, write it out if that is
6865 if (!TREE_ASM_WRITTEN (fndecl) && TREE_ADDRESSABLE (fndecl))
6867 push_function_context ();
6868 output_inline_function (fndecl);
6869 pop_function_context ();
6875 /* Save and restore the variables in this file and elsewhere
6876 that keep track of the progress of compilation of the current function.
6877 Used for nested functions. */
6879 struct c_language_function
6881 struct language_function base;
6883 tree shadowed_labels;
6886 int warn_about_return_type;
6888 struct binding_level *binding_level;
6891 /* Save and reinitialize the variables
6892 used during compilation of a C function. */
6895 push_c_function_context (f)
6898 struct c_language_function *p;
6899 p = ((struct c_language_function *)
6900 xmalloc (sizeof (struct c_language_function)));
6901 f->language = (struct language_function *) p;
6903 p->base.x_stmt_tree = c_stmt_tree;
6904 p->base.x_scope_stmt_stack = c_scope_stmt_stack;
6905 p->base.x_function_name_declared_p = c_function_name_declared_p;
6906 p->named_labels = named_labels;
6907 p->shadowed_labels = shadowed_labels;
6908 p->returns_value = current_function_returns_value;
6909 p->returns_null = current_function_returns_null;
6910 p->warn_about_return_type = warn_about_return_type;
6911 p->extern_inline = current_extern_inline;
6912 p->binding_level = current_binding_level;
6915 /* Restore the variables used during compilation of a C function. */
6918 pop_c_function_context (f)
6921 struct c_language_function *p
6922 = (struct c_language_function *) f->language;
6925 /* Bring back all the labels that were shadowed. */
6926 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
6927 if (DECL_NAME (TREE_VALUE (link)) != 0)
6928 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
6929 = TREE_VALUE (link);
6931 if (DECL_SAVED_INSNS (current_function_decl) == 0
6932 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6934 /* Stop pointing to the local nodes about to be freed. */
6935 /* But DECL_INITIAL must remain nonzero so we know this
6936 was an actual function definition. */
6937 DECL_INITIAL (current_function_decl) = error_mark_node;
6938 DECL_ARGUMENTS (current_function_decl) = 0;
6941 c_stmt_tree = p->base.x_stmt_tree;
6942 c_scope_stmt_stack = p->base.x_scope_stmt_stack;
6943 c_function_name_declared_p = p->base.x_function_name_declared_p;
6944 named_labels = p->named_labels;
6945 shadowed_labels = p->shadowed_labels;
6946 current_function_returns_value = p->returns_value;
6947 current_function_returns_null = p->returns_null;
6948 warn_about_return_type = p->warn_about_return_type;
6949 current_extern_inline = p->extern_inline;
6950 current_binding_level = p->binding_level;
6956 /* Mark the language specific parts of F for GC. */
6959 mark_c_function_context (f)
6962 struct c_language_function *p
6963 = (struct c_language_function *) f->language;
6968 mark_c_language_function (&p->base);
6969 ggc_mark_tree (p->shadowed_labels);
6970 ggc_mark_tree (p->named_labels);
6971 mark_binding_level (&p->binding_level);
6974 /* Copy the DECL_LANG_SEPECIFIC data associated with NODE. */
6977 copy_lang_decl (decl)
6980 struct lang_decl *ld;
6982 if (!DECL_LANG_SPECIFIC (decl))
6985 ld = (struct lang_decl *) ggc_alloc (sizeof (struct lang_decl));
6986 bcopy ((char *)DECL_LANG_SPECIFIC (decl), (char *)ld,
6987 sizeof (struct lang_decl));
6988 DECL_LANG_SPECIFIC (decl) = ld;
6991 /* Mark the language specific bits in T for GC. */
6997 if (TREE_CODE (t) == IDENTIFIER_NODE)
6999 struct lang_identifier *i = (struct lang_identifier *) t;
7000 ggc_mark_tree (i->global_value);
7001 ggc_mark_tree (i->local_value);
7002 ggc_mark_tree (i->label_value);
7003 ggc_mark_tree (i->implicit_decl);
7004 ggc_mark_tree (i->error_locus);
7005 ggc_mark_tree (i->limbo_value);
7007 else if (TYPE_P (t) && TYPE_LANG_SPECIFIC (t))
7008 ggc_mark (TYPE_LANG_SPECIFIC (t));
7009 else if (DECL_P (t) && DECL_LANG_SPECIFIC (t))
7011 ggc_mark (DECL_LANG_SPECIFIC (t));
7012 c_mark_lang_decl (&DECL_LANG_SPECIFIC (t)->base);
7016 /* The functions below are required for functionality of doing
7017 function at once processing in the C front end. Currently these
7018 functions are not called from anywhere in the C front end, but as
7019 these changes continue, that will change. */
7021 /* Returns non-zero if the current statement is a full expression,
7022 i.e. temporaries created during that statement should be destroyed
7023 at the end of the statement. */
7026 stmts_are_full_exprs_p ()
7031 /* Returns the stmt_tree (if any) to which statements are currently
7032 being added. If there is no active statement-tree, NULL is
7036 current_stmt_tree ()
7038 return &c_stmt_tree;
7041 /* Returns the stack of SCOPE_STMTs for the current function. */
7044 current_scope_stmt_stack ()
7046 return &c_scope_stmt_stack;
7049 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
7053 anon_aggr_type_p (node)
7054 tree node ATTRIBUTE_UNUSED;
7059 /* Dummy function in place of callback used by C++. */
7062 extract_interface_info ()
7066 /* Return a new COMPOUND_STMT, after adding it to the current
7070 c_begin_compound_stmt ()
7074 /* Create the COMPOUND_STMT. */
7075 stmt = add_stmt (build_stmt (COMPOUND_STMT, NULL_TREE));
7076 /* If we haven't already declared __FUNCTION__ and its ilk then this
7077 is the opening curly brace of the function. Declare them now. */
7078 if (!c_function_name_declared_p)
7080 c_function_name_declared_p = 1;
7081 declare_function_name ();
7087 /* Expand T (a DECL_STMT) if it declares an entity not handled by the
7091 c_expand_decl_stmt (t)
7094 tree decl = DECL_STMT_DECL (t);
7096 /* Expand nested functions. */
7097 if (TREE_CODE (decl) == FUNCTION_DECL
7098 && DECL_CONTEXT (decl) == current_function_decl
7099 && DECL_SAVED_TREE (decl))
7100 c_expand_body (decl, /*nested_p=*/1);