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. */
46 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
48 { NORMAL, /* Ordinary declaration */
49 FUNCDEF, /* Function definition */
50 PARM, /* Declaration of parm before function body */
51 FIELD, /* Declaration inside struct or union */
52 BITFIELD, /* Likewise but with specified width */
53 TYPENAME}; /* Typename (inside cast or sizeof) */
55 /* We let tm.h override the types used here, to handle trivial differences
56 such as the choice of unsigned int or long unsigned int for size_t.
57 When machines start needing nontrivial differences in the size type,
58 it would be best to do something here to figure out automatically
59 from other information what type to use. */
62 #define SIZE_TYPE "long unsigned int"
66 #define WCHAR_TYPE "int"
70 /* Nonzero if we have seen an invalid cross reference
71 to a struct, union, or enum, but not yet printed the message. */
73 tree pending_invalid_xref;
74 /* File and line to appear in the eventual error message. */
75 const char *pending_invalid_xref_file;
76 int pending_invalid_xref_line;
78 /* While defining an enum type, this is 1 plus the last enumerator
79 constant value. Note that will do not have to save this or `enum_overflow'
80 around nested function definition since such a definition could only
81 occur in an enum value expression and we don't use these variables in
84 static tree enum_next_value;
86 /* Nonzero means that there was overflow computing enum_next_value. */
88 static int enum_overflow;
90 /* Parsing a function declarator leaves a list of parameter names
91 or a chain or parameter decls here. */
93 static tree last_function_parms;
95 /* Parsing a function declarator leaves here a chain of structure
96 and enum types declared in the parmlist. */
98 static tree last_function_parm_tags;
100 /* After parsing the declarator that starts a function definition,
101 `start_function' puts here the list of parameter names or chain of decls.
102 `store_parm_decls' finds it here. */
104 static tree current_function_parms;
106 /* Similar, for last_function_parm_tags. */
107 static tree current_function_parm_tags;
109 /* Similar, for the file and line that the prototype came from if this is
110 an old-style definition. */
111 static const char *current_function_prototype_file;
112 static int current_function_prototype_line;
114 /* The current statement tree. */
116 static struct stmt_tree_s c_stmt_tree;
118 /* The current scope statement stack. */
120 static tree c_scope_stmt_stack;
122 /* Nonzero if __FUNCTION__ and its ilk have been declared in this
125 static int c_function_name_declared_p;
127 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
128 that have names. Here so we can clear out their names' definitions
129 at the end of the function. */
131 static tree named_labels;
133 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
135 static tree shadowed_labels;
137 /* Nonzero when store_parm_decls is called indicates a varargs function.
138 Value not meaningful after store_parm_decls. */
140 static int c_function_varargs;
142 /* Set to 0 at beginning of a function definition, set to 1 if
143 a return statement that specifies a return value is seen. */
145 int current_function_returns_value;
147 /* Set to 0 at beginning of a function definition, set to 1 if
148 a return statement with no argument is seen. */
150 int current_function_returns_null;
152 /* Set to nonzero by `grokdeclarator' for a function
153 whose return type is defaulted, if warnings for this are desired. */
155 static int warn_about_return_type;
157 /* Nonzero when starting a function declared `extern inline'. */
159 static int current_extern_inline;
161 /* For each binding contour we allocate a binding_level structure
162 * which records the names defined in that contour.
165 * 1) one for each function definition,
166 * where internal declarations of the parameters appear.
167 * 2) one for each compound statement,
168 * to record its declarations.
170 * The current meaning of a name can be found by searching the levels from
171 * the current one out to the global one.
174 /* Note that the information in the `names' component of the global contour
175 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
179 /* A chain of _DECL nodes for all variables, constants, functions,
180 and typedef types. These are in the reverse of the order supplied.
184 /* A list of structure, union and enum definitions,
185 * for looking up tag names.
186 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
187 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
188 * or ENUMERAL_TYPE node.
192 /* For each level, a list of shadowed outer-level local definitions
193 to be restored when this level is popped.
194 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
195 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
198 /* For each level (except not the global one),
199 a chain of BLOCK nodes for all the levels
200 that were entered and exited one level down. */
203 /* The BLOCK node for this level, if one has been preallocated.
204 If 0, the BLOCK is allocated (if needed) when the level is popped. */
207 /* The binding level which this one is contained in (inherits from). */
208 struct binding_level *level_chain;
210 /* Nonzero for the level that holds the parameters of a function. */
213 /* Nonzero if this level "doesn't exist" for tags. */
214 char tag_transparent;
216 /* Nonzero if sublevels of this level "don't exist" for tags.
217 This is set in the parm level of a function definition
218 while reading the function body, so that the outermost block
219 of the function body will be tag-transparent. */
220 char subblocks_tag_transparent;
222 /* Nonzero means make a BLOCK for this level regardless of all else. */
225 /* Nonzero means make a BLOCK if this level has any subblocks. */
226 char keep_if_subblocks;
228 /* Number of decls in `names' that have incomplete
229 structure or union types. */
232 /* A list of decls giving the (reversed) specified order of parms,
233 not including any forward-decls in the parmlist.
234 This is so we can put the parms in proper order for assign_parms. */
238 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
240 /* The binding level currently in effect. */
242 static struct binding_level *current_binding_level;
244 /* A chain of binding_level structures awaiting reuse. */
246 static struct binding_level *free_binding_level;
248 /* The outermost binding level, for names of file scope.
249 This is created when the compiler is started and exists
250 through the entire run. */
252 static struct binding_level *global_binding_level;
254 /* Binding level structures are initialized by copying this one. */
256 static struct binding_level clear_binding_level
257 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, 0,
260 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
262 static int keep_next_level_flag;
264 /* Nonzero means make a BLOCK for the next level pushed
265 if it has subblocks. */
267 static int keep_next_if_subblocks;
269 /* The chain of outer levels of label scopes.
270 This uses the same data structure used for binding levels,
271 but it works differently: each link in the chain records
272 saved values of named_labels and shadowed_labels for
273 a label binding level outside the current one. */
275 static struct binding_level *label_level_chain;
277 /* Functions called automatically at the beginning and end of execution. */
279 tree static_ctors, static_dtors;
281 /* Forward declarations. */
283 static struct binding_level * make_binding_level PARAMS ((void));
284 static void mark_binding_level PARAMS ((void *));
285 static void clear_limbo_values PARAMS ((tree));
286 static int duplicate_decls PARAMS ((tree, tree, int));
287 static int redeclaration_error_message PARAMS ((tree, tree));
288 static void storedecls PARAMS ((tree));
289 static void storetags PARAMS ((tree));
290 static tree lookup_tag PARAMS ((enum tree_code, tree,
291 struct binding_level *, int));
292 static tree lookup_tag_reverse PARAMS ((tree));
293 static tree grokdeclarator PARAMS ((tree, tree, enum decl_context,
295 static tree grokparms PARAMS ((tree, int));
296 static void layout_array_type PARAMS ((tree));
297 static tree c_make_fname_decl PARAMS ((tree, const char *, int));
298 static void c_expand_body PARAMS ((tree, int));
300 /* C-specific option variables. */
302 /* Nonzero means allow type mismatches in conditional expressions;
303 just make their values `void'. */
305 int flag_cond_mismatch;
307 /* Nonzero means give `double' the same size as `float'. */
309 int flag_short_double;
311 /* Nonzero means give `wchar_t' the same size as `short'. */
313 int flag_short_wchar;
315 /* Nonzero means don't recognize the keyword `asm'. */
319 /* Nonzero means do some things the same way PCC does. */
321 int flag_traditional;
323 /* Nonzero means enable C89 Amendment 1 features. */
327 /* Nonzero means use the ISO C99 dialect of C. */
331 /* Nonzero means that we have builtin functions, and main is an int */
335 /* Nonzero means add default format_arg attributes for functions not
338 int flag_noniso_default_format_attributes = 1;
340 /* Nonzero means to allow single precision math even if we're generally
341 being traditional. */
342 int flag_allow_single_precision = 0;
344 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
346 int flag_signed_bitfields = 1;
347 int explicit_flag_signed_bitfields = 0;
349 /* Nonzero means warn about use of implicit int. */
351 int warn_implicit_int;
353 /* Nonzero means warn about usage of long long when `-pedantic'. */
355 int warn_long_long = 1;
357 /* Nonzero means message about use of implicit function declarations;
358 1 means warning; 2 means error. */
360 int mesg_implicit_function_declaration = -1;
362 /* Nonzero means give string constants the type `const char *'
363 to get extra warnings from them. These warnings will be too numerous
364 to be useful, except in thoroughly ANSIfied programs. */
366 int flag_const_strings;
368 /* Nonzero means warn about pointer casts that can drop a type qualifier
369 from the pointer target type. */
373 /* Nonzero means warn when casting a function call to a type that does
374 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
375 when there is no previous declaration of sqrt or malloc. */
377 int warn_bad_function_cast;
379 /* Warn about functions which might be candidates for format attributes. */
381 int warn_missing_format_attribute;
383 /* Warn about traditional constructs whose meanings changed in ANSI C. */
385 int warn_traditional;
387 /* Nonzero means warn about sizeof(function) or addition/subtraction
388 of function pointers. */
390 int warn_pointer_arith;
392 /* Nonzero means warn for non-prototype function decls
393 or non-prototyped defs without previous prototype. */
395 int warn_strict_prototypes;
397 /* Nonzero means warn for any global function def
398 without separate previous prototype decl. */
400 int warn_missing_prototypes;
402 /* Nonzero means warn for any global function def
403 without separate previous decl. */
405 int warn_missing_declarations;
407 /* Nonzero means warn about multiple (redundant) decls for the same single
408 variable or function. */
410 int warn_redundant_decls = 0;
412 /* Nonzero means warn about extern declarations of objects not at
413 file-scope level and about *all* declarations of functions (whether
414 extern or static) not at file-scope level. Note that we exclude
415 implicit function declarations. To get warnings about those, use
418 int warn_nested_externs = 0;
420 /* Warn about a subscript that has type char. */
422 int warn_char_subscripts = 0;
424 /* Warn if a type conversion is done that might have confusing results. */
428 /* Warn if adding () is suggested. */
430 int warn_parentheses;
432 /* Warn if initializer is not completely bracketed. */
434 int warn_missing_braces;
436 /* Warn if main is suspicious. */
440 /* Warn about #pragma directives that are not recognised. */
442 int warn_unknown_pragmas = 0; /* Tri state variable. */
444 /* Warn about comparison of signed and unsigned values.
445 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
447 int warn_sign_compare = -1;
449 /* Warn about testing equality of floating point numbers. */
451 int warn_float_equal = 0;
453 /* Nonzero means warn about use of multicharacter literals. */
455 int warn_multichar = 1;
457 /* The variant of the C language being processed. */
459 c_language_kind c_language = clk_c;
461 /* Nonzero means `$' can be in an identifier. */
463 #ifndef DOLLARS_IN_IDENTIFIERS
464 #define DOLLARS_IN_IDENTIFIERS 1
466 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
468 /* Decode the string P as a language-specific option for C.
469 Return the number of strings consumed. Should not complain
470 if it does not recognise the option. */
473 c_decode_option (argc, argv)
474 int argc ATTRIBUTE_UNUSED;
477 int strings_processed;
478 const char *option_value = NULL;
481 strings_processed = cpp_handle_option (parse_in, argc, argv);
483 if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
485 flag_traditional = 1;
486 flag_writable_strings = 1;
488 else if (!strcmp (p, "-fallow-single-precision"))
489 flag_allow_single_precision = 1;
490 else if (!strcmp (p, "-fhosted") || !strcmp (p, "-fno-freestanding"))
495 else if (!strcmp (p, "-ffreestanding") || !strcmp (p, "-fno-hosted"))
499 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
503 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
505 flag_traditional = 0;
506 flag_writable_strings = 0;
508 else if (!strncmp (p, "-std=", 5))
510 /* Select the appropriate language standard. We currently
512 -std=iso9899:1990 same as -ansi
513 -std=iso9899:199409 ISO C as modified in amend. 1
514 -std=iso9899:1999 ISO C 99
515 -std=c89 same as -std=iso9899:1990
516 -std=c99 same as -std=iso9899:1999
517 -std=gnu89 default, iso9899:1990 + gnu extensions
518 -std=gnu99 iso9899:1999 + gnu extensions
520 const char *argstart = &p[5];
522 if (!strcmp (argstart, "iso9899:1990")
523 || !strcmp (argstart, "c89"))
528 flag_traditional = 0;
529 flag_writable_strings = 0;
531 flag_no_nonansi_builtin = 1;
532 flag_noniso_default_format_attributes = 0;
535 else if (!strcmp (argstart, "iso9899:199409"))
540 else if (!strcmp (argstart, "iso9899:199x")
541 || !strcmp (argstart, "iso9899:1999")
542 || !strcmp (argstart, "c9x")
543 || !strcmp (argstart, "c99"))
545 flag_traditional = 0;
546 flag_writable_strings = 0;
548 flag_no_nonansi_builtin = 1;
549 flag_noniso_default_format_attributes = 0;
553 else if (!strcmp (argstart, "gnu89"))
555 flag_traditional = 0;
556 flag_writable_strings = 0;
558 flag_no_nonansi_builtin = 0;
559 flag_noniso_default_format_attributes = 1;
563 else if (!strcmp (argstart, "gnu9x") || !strcmp (argstart, "gnu99"))
565 flag_traditional = 0;
566 flag_writable_strings = 0;
568 flag_no_nonansi_builtin = 0;
569 flag_noniso_default_format_attributes = 1;
574 error ("unknown C standard `%s'", argstart);
576 else if (!strcmp (p, "-fdollars-in-identifiers"))
577 dollars_in_ident = 1;
578 else if (!strcmp (p, "-fno-dollars-in-identifiers"))
579 dollars_in_ident = 0;
580 else if (!strcmp (p, "-fsigned-char"))
581 flag_signed_char = 1;
582 else if (!strcmp (p, "-funsigned-char"))
583 flag_signed_char = 0;
584 else if (!strcmp (p, "-fno-signed-char"))
585 flag_signed_char = 0;
586 else if (!strcmp (p, "-fno-unsigned-char"))
587 flag_signed_char = 1;
588 else if (!strcmp (p, "-fsigned-bitfields")
589 || !strcmp (p, "-fno-unsigned-bitfields"))
591 flag_signed_bitfields = 1;
592 explicit_flag_signed_bitfields = 1;
594 else if (!strcmp (p, "-funsigned-bitfields")
595 || !strcmp (p, "-fno-signed-bitfields"))
597 flag_signed_bitfields = 0;
598 explicit_flag_signed_bitfields = 1;
600 else if (!strcmp (p, "-fshort-enums"))
601 flag_short_enums = 1;
602 else if (!strcmp (p, "-fno-short-enums"))
603 flag_short_enums = 0;
604 else if (!strcmp (p, "-fshort-wchar"))
605 flag_short_wchar = 1;
606 else if (!strcmp (p, "-fno-short-wchar"))
607 flag_short_wchar = 0;
608 else if (!strcmp (p, "-fcond-mismatch"))
609 flag_cond_mismatch = 1;
610 else if (!strcmp (p, "-fno-cond-mismatch"))
611 flag_cond_mismatch = 0;
612 else if (!strcmp (p, "-fshort-double"))
613 flag_short_double = 1;
614 else if (!strcmp (p, "-fno-short-double"))
615 flag_short_double = 0;
616 else if (!strcmp (p, "-fasm"))
618 else if (!strcmp (p, "-fno-asm"))
620 else if (!strcmp (p, "-fbuiltin"))
622 else if (!strcmp (p, "-fno-builtin"))
624 else if ((option_value
625 = skip_leading_substring (p, "-fdump-translation-unit-")))
628 error ("no file specified with -fdump-translation-unit");
630 flag_dump_translation_unit = option_value;
632 else if (!strcmp (p, "-ansi"))
634 else if (!strcmp (p, "-Werror-implicit-function-declaration"))
635 mesg_implicit_function_declaration = 2;
636 else if (!strcmp (p, "-Wimplicit-function-declaration"))
637 mesg_implicit_function_declaration = 1;
638 else if (!strcmp (p, "-Wno-implicit-function-declaration"))
639 mesg_implicit_function_declaration = 0;
640 else if (!strcmp (p, "-Wimplicit-int"))
641 warn_implicit_int = 1;
642 else if (!strcmp (p, "-Wno-implicit-int"))
643 warn_implicit_int = 0;
644 else if (!strcmp (p, "-Wimplicit"))
646 warn_implicit_int = 1;
647 if (mesg_implicit_function_declaration != 2)
648 mesg_implicit_function_declaration = 1;
650 else if (!strcmp (p, "-Wno-implicit"))
651 warn_implicit_int = 0, mesg_implicit_function_declaration = 0;
652 else if (!strcmp (p, "-Wlong-long"))
654 else if (!strcmp (p, "-Wno-long-long"))
656 else if (!strcmp (p, "-Wwrite-strings"))
657 flag_const_strings = 1;
658 else if (!strcmp (p, "-Wno-write-strings"))
659 flag_const_strings = 0;
660 else if (!strcmp (p, "-Wcast-qual"))
662 else if (!strcmp (p, "-Wno-cast-qual"))
664 else if (!strcmp (p, "-Wbad-function-cast"))
665 warn_bad_function_cast = 1;
666 else if (!strcmp (p, "-Wno-bad-function-cast"))
667 warn_bad_function_cast = 0;
668 else if (!strcmp (p, "-Wmissing-noreturn"))
669 warn_missing_noreturn = 1;
670 else if (!strcmp (p, "-Wno-missing-noreturn"))
671 warn_missing_noreturn = 0;
672 else if (!strcmp (p, "-Wmissing-format-attribute"))
673 warn_missing_format_attribute = 1;
674 else if (!strcmp (p, "-Wno-missing-format-attribute"))
675 warn_missing_format_attribute = 0;
676 else if (!strcmp (p, "-Wpointer-arith"))
677 warn_pointer_arith = 1;
678 else if (!strcmp (p, "-Wno-pointer-arith"))
679 warn_pointer_arith = 0;
680 else if (!strcmp (p, "-Wstrict-prototypes"))
681 warn_strict_prototypes = 1;
682 else if (!strcmp (p, "-Wno-strict-prototypes"))
683 warn_strict_prototypes = 0;
684 else if (!strcmp (p, "-Wmissing-prototypes"))
685 warn_missing_prototypes = 1;
686 else if (!strcmp (p, "-Wno-missing-prototypes"))
687 warn_missing_prototypes = 0;
688 else if (!strcmp (p, "-Wmissing-declarations"))
689 warn_missing_declarations = 1;
690 else if (!strcmp (p, "-Wno-missing-declarations"))
691 warn_missing_declarations = 0;
692 else if (!strcmp (p, "-Wredundant-decls"))
693 warn_redundant_decls = 1;
694 else if (!strcmp (p, "-Wno-redundant-decls"))
695 warn_redundant_decls = 0;
696 else if (!strcmp (p, "-Wnested-externs"))
697 warn_nested_externs = 1;
698 else if (!strcmp (p, "-Wno-nested-externs"))
699 warn_nested_externs = 0;
700 else if (!strcmp (p, "-Wtraditional"))
701 warn_traditional = 1;
702 else if (!strcmp (p, "-Wno-traditional"))
703 warn_traditional = 0;
704 else if (!strncmp (p, "-Wformat=", 9))
705 set_Wformat (atoi (p + 9));
706 else if (!strcmp (p, "-Wformat"))
708 else if (!strcmp (p, "-Wno-format"))
710 else if (!strcmp (p, "-Wformat-y2k"))
712 else if (!strcmp (p, "-Wno-format-y2k"))
714 else if (!strcmp (p, "-Wformat-extra-args"))
715 warn_format_extra_args = 1;
716 else if (!strcmp (p, "-Wno-format-extra-args"))
717 warn_format_extra_args = 0;
718 else if (!strcmp (p, "-Wformat-nonliteral"))
719 warn_format_nonliteral = 1;
720 else if (!strcmp (p, "-Wno-format-nonliteral"))
721 warn_format_nonliteral = 0;
722 else if (!strcmp (p, "-Wformat-security"))
723 warn_format_security = 1;
724 else if (!strcmp (p, "-Wno-format-security"))
725 warn_format_security = 0;
726 else if (!strcmp (p, "-Wchar-subscripts"))
727 warn_char_subscripts = 1;
728 else if (!strcmp (p, "-Wno-char-subscripts"))
729 warn_char_subscripts = 0;
730 else if (!strcmp (p, "-Wconversion"))
732 else if (!strcmp (p, "-Wno-conversion"))
734 else if (!strcmp (p, "-Wparentheses"))
735 warn_parentheses = 1;
736 else if (!strcmp (p, "-Wno-parentheses"))
737 warn_parentheses = 0;
738 else if (!strcmp (p, "-Wreturn-type"))
739 warn_return_type = 1;
740 else if (!strcmp (p, "-Wno-return-type"))
741 warn_return_type = 0;
742 else if (!strcmp (p, "-Wsequence-point"))
743 warn_sequence_point = 1;
744 else if (!strcmp (p, "-Wno-sequence-point"))
745 warn_sequence_point = 0;
746 else if (!strcmp (p, "-Wcomment"))
747 ; /* cpp handles this one. */
748 else if (!strcmp (p, "-Wno-comment"))
749 ; /* cpp handles this one. */
750 else if (!strcmp (p, "-Wcomments"))
751 ; /* cpp handles this one. */
752 else if (!strcmp (p, "-Wno-comments"))
753 ; /* cpp handles this one. */
754 else if (!strcmp (p, "-Wtrigraphs"))
755 ; /* cpp handles this one. */
756 else if (!strcmp (p, "-Wno-trigraphs"))
757 ; /* cpp handles this one. */
758 else if (!strcmp (p, "-Wundef"))
759 ; /* cpp handles this one. */
760 else if (!strcmp (p, "-Wno-undef"))
761 ; /* cpp handles this one. */
762 else if (!strcmp (p, "-Wimport"))
763 ; /* cpp handles this one. */
764 else if (!strcmp (p, "-Wno-import"))
765 ; /* cpp handles this one. */
766 else if (!strcmp (p, "-Wmissing-braces"))
767 warn_missing_braces = 1;
768 else if (!strcmp (p, "-Wno-missing-braces"))
769 warn_missing_braces = 0;
770 else if (!strcmp (p, "-Wmain"))
772 else if (!strcmp (p, "-Wno-main"))
774 else if (!strcmp (p, "-Wsign-compare"))
775 warn_sign_compare = 1;
776 else if (!strcmp (p, "-Wno-sign-compare"))
777 warn_sign_compare = 0;
778 else if (!strcmp (p, "-Wfloat-equal"))
779 warn_float_equal = 1;
780 else if (!strcmp (p, "-Wno-float-equal"))
781 warn_float_equal = 0;
782 else if (!strcmp (p, "-Wmultichar"))
784 else if (!strcmp (p, "-Wno-multichar"))
786 else if (!strcmp (p, "-Wunknown-pragmas"))
787 /* Set to greater than 1, so that even unknown pragmas in system
788 headers will be warned about. */
789 warn_unknown_pragmas = 2;
790 else if (!strcmp (p, "-Wno-unknown-pragmas"))
791 warn_unknown_pragmas = 0;
792 else if (!strcmp (p, "-Wall"))
794 /* We save the value of warn_uninitialized, since if they put
795 -Wuninitialized on the command line, we need to generate a
796 warning about not using it without also specifying -O. */
797 if (warn_uninitialized != 1)
798 warn_uninitialized = 2;
799 warn_implicit_int = 1;
800 mesg_implicit_function_declaration = 1;
801 warn_return_type = 1;
805 warn_char_subscripts = 1;
806 warn_parentheses = 1;
807 warn_sequence_point = 1;
808 warn_missing_braces = 1;
809 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
810 it off only if it's not explicit. */
812 /* Only warn about unknown pragmas that are not in system headers. */
813 warn_unknown_pragmas = 1;
816 return strings_processed;
821 /* Hooks for print_node. */
824 print_lang_decl (file, node, indent)
825 FILE *file ATTRIBUTE_UNUSED;
826 tree node ATTRIBUTE_UNUSED;
827 int indent ATTRIBUTE_UNUSED;
832 print_lang_type (file, node, indent)
833 FILE *file ATTRIBUTE_UNUSED;
834 tree node ATTRIBUTE_UNUSED;
835 int indent ATTRIBUTE_UNUSED;
840 print_lang_identifier (file, node, indent)
845 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
846 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
847 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
848 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
849 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
850 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
851 if (C_IS_RESERVED_WORD (node))
853 tree rid = ridpointers[C_RID_CODE (node)];
854 indent_to (file, indent + 4);
855 fprintf (file, "rid ");
856 fprintf (file, HOST_PTR_PRINTF, (void *)rid);
857 fprintf (file, " \"%s\"", IDENTIFIER_POINTER (rid));
861 /* Hook called at end of compilation to assume 1 elt
862 for a top-level tentative array defn that wasn't complete before. */
865 finish_incomplete_decl (decl)
868 if (TREE_CODE (decl) == VAR_DECL)
870 tree type = TREE_TYPE (decl);
871 if (type != error_mark_node
872 && TREE_CODE (type) == ARRAY_TYPE
873 && ! DECL_EXTERNAL (decl)
874 && TYPE_DOMAIN (type) == 0)
876 warning_with_decl (decl, "array `%s' assumed to have one element");
878 complete_array_type (type, NULL_TREE, 1);
880 layout_decl (decl, 0);
885 /* Create a new `struct binding_level'. */
887 static struct binding_level *
888 make_binding_level ()
891 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
894 /* Nonzero if we are currently in the global binding level. */
899 return current_binding_level == global_binding_level;
905 keep_next_level_flag = 1;
908 /* Nonzero if the current level needs to have a BLOCK made. */
913 return ((current_binding_level->keep_if_subblocks
914 && current_binding_level->blocks != 0)
915 || current_binding_level->keep
916 || current_binding_level->names != 0
917 || (current_binding_level->tags != 0
918 && !current_binding_level->tag_transparent));
921 /* Identify this binding level as a level of parameters.
922 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
923 But it turns out there is no way to pass the right value for
924 DEFINITION_FLAG, so we ignore it. */
927 declare_parm_level (definition_flag)
928 int definition_flag ATTRIBUTE_UNUSED;
930 current_binding_level->parm_flag = 1;
933 /* Nonzero if currently making parm declarations. */
938 return current_binding_level->parm_flag;
941 /* Enter a new binding level.
942 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
943 not for that of tags. */
946 pushlevel (tag_transparent)
949 register struct binding_level *newlevel = NULL_BINDING_LEVEL;
951 /* If this is the top level of a function,
952 just make sure that NAMED_LABELS is 0. */
954 if (current_binding_level == global_binding_level)
959 /* Reuse or create a struct for this binding level. */
961 if (free_binding_level)
963 newlevel = free_binding_level;
964 free_binding_level = free_binding_level->level_chain;
968 newlevel = make_binding_level ();
971 /* Add this level to the front of the chain (stack) of levels that
974 *newlevel = clear_binding_level;
975 newlevel->tag_transparent
977 || (current_binding_level
978 ? current_binding_level->subblocks_tag_transparent
980 newlevel->level_chain = current_binding_level;
981 current_binding_level = newlevel;
982 newlevel->keep = keep_next_level_flag;
983 keep_next_level_flag = 0;
984 newlevel->keep_if_subblocks = keep_next_if_subblocks;
985 keep_next_if_subblocks = 0;
988 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
991 clear_limbo_values (block)
996 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
997 if (DECL_NAME (tem) != 0)
998 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
1000 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
1001 clear_limbo_values (tem);
1004 /* Exit a binding level.
1005 Pop the level off, and restore the state of the identifier-decl mappings
1006 that were in effect when this level was entered.
1008 If KEEP is nonzero, this level had explicit declarations, so
1009 and create a "block" (a BLOCK node) for the level
1010 to record its declarations and subblocks for symbol table output.
1012 If FUNCTIONBODY is nonzero, this level is the body of a function,
1013 so create a block as if KEEP were set and also clear out all
1016 If REVERSE is nonzero, reverse the order of decls before putting
1017 them into the BLOCK. */
1020 poplevel (keep, reverse, functionbody)
1026 /* The chain of decls was accumulated in reverse order.
1027 Put it into forward order, just for cleanliness. */
1029 tree tags = current_binding_level->tags;
1030 tree subblocks = current_binding_level->blocks;
1033 int block_previously_created;
1035 keep |= current_binding_level->keep;
1037 /* This warning is turned off because it causes warnings for
1038 declarations like `extern struct foo *x'. */
1040 /* Warn about incomplete structure types in this level. */
1041 for (link = tags; link; link = TREE_CHAIN (link))
1042 if (!COMPLETE_TYPE_P (TREE_VALUE (link)))
1044 tree type = TREE_VALUE (link);
1045 tree type_name = TYPE_NAME (type);
1046 char *id = IDENTIFIER_POINTER (TREE_CODE (type_name) == IDENTIFIER_NODE
1048 : DECL_NAME (type_name));
1049 switch (TREE_CODE (type))
1052 error ("`struct %s' incomplete in scope ending here", id);
1055 error ("`union %s' incomplete in scope ending here", id);
1058 error ("`enum %s' incomplete in scope ending here", id);
1064 /* Get the decls in the order they were written.
1065 Usually current_binding_level->names is in reverse order.
1066 But parameter decls were previously put in forward order. */
1069 current_binding_level->names
1070 = decls = nreverse (current_binding_level->names);
1072 decls = current_binding_level->names;
1074 /* Output any nested inline functions within this block
1075 if they weren't already output. */
1077 for (decl = decls; decl; decl = TREE_CHAIN (decl))
1078 if (TREE_CODE (decl) == FUNCTION_DECL
1079 && ! TREE_ASM_WRITTEN (decl)
1080 && DECL_INITIAL (decl) != 0
1081 && TREE_ADDRESSABLE (decl))
1083 /* If this decl was copied from a file-scope decl
1084 on account of a block-scope extern decl,
1085 propagate TREE_ADDRESSABLE to the file-scope decl.
1087 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1088 true, since then the decl goes through save_for_inline_copying. */
1089 if (DECL_ABSTRACT_ORIGIN (decl) != 0
1090 && DECL_ABSTRACT_ORIGIN (decl) != decl)
1091 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
1094 /* We used to warn about unused variables in expand_end_bindings,
1095 i.e. while generating RTL. But in function-at-a-time mode we may
1096 choose to never expand a function at all (e.g. auto inlining), so
1097 we do this explicitly now. */
1098 warn_about_unused_variables (getdecls ());
1100 /* If there were any declarations or structure tags in that level,
1101 or if this level is a function body,
1102 create a BLOCK to record them for the life of this function. */
1105 block_previously_created = (current_binding_level->this_block != 0);
1106 if (block_previously_created)
1107 block = current_binding_level->this_block;
1108 else if (keep || functionbody
1109 || (current_binding_level->keep_if_subblocks && subblocks != 0))
1110 block = make_node (BLOCK);
1113 BLOCK_VARS (block) = decls;
1114 BLOCK_SUBBLOCKS (block) = subblocks;
1117 /* In each subblock, record that this is its superior. */
1119 for (link = subblocks; link; link = TREE_CHAIN (link))
1120 BLOCK_SUPERCONTEXT (link) = block;
1122 /* Clear out the meanings of the local variables of this level. */
1124 for (link = decls; link; link = TREE_CHAIN (link))
1126 if (DECL_NAME (link) != 0)
1128 /* If the ident. was used or addressed via a local extern decl,
1129 don't forget that fact. */
1130 if (DECL_EXTERNAL (link))
1132 if (TREE_USED (link))
1133 TREE_USED (DECL_NAME (link)) = 1;
1134 if (TREE_ADDRESSABLE (link))
1135 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1137 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1141 /* Restore all name-meanings of the outer levels
1142 that were shadowed by this level. */
1144 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1145 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1147 /* If the level being exited is the top level of a function,
1148 check over all the labels, and clear out the current
1149 (function local) meanings of their names. */
1153 clear_limbo_values (block);
1155 /* If this is the top level block of a function,
1156 the vars are the function's parameters.
1157 Don't leave them in the BLOCK because they are
1158 found in the FUNCTION_DECL instead. */
1160 BLOCK_VARS (block) = 0;
1162 /* Clear out the definitions of all label names,
1163 since their scopes end here,
1164 and add them to BLOCK_VARS. */
1166 for (link = named_labels; link; link = TREE_CHAIN (link))
1168 register tree label = TREE_VALUE (link);
1170 if (DECL_INITIAL (label) == 0)
1172 error_with_decl (label, "label `%s' used but not defined");
1173 /* Avoid crashing later. */
1174 define_label (input_filename, lineno,
1177 else if (warn_unused_label && !TREE_USED (label))
1178 warning_with_decl (label, "label `%s' defined but not used");
1179 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1181 /* Put the labels into the "variables" of the
1182 top-level block, so debugger can see them. */
1183 TREE_CHAIN (label) = BLOCK_VARS (block);
1184 BLOCK_VARS (block) = label;
1188 /* Pop the current level, and free the structure for reuse. */
1191 register struct binding_level *level = current_binding_level;
1192 current_binding_level = current_binding_level->level_chain;
1194 level->level_chain = free_binding_level;
1195 free_binding_level = level;
1198 /* Dispose of the block that we just made inside some higher level. */
1200 DECL_INITIAL (current_function_decl) = block;
1203 if (!block_previously_created)
1204 current_binding_level->blocks
1205 = chainon (current_binding_level->blocks, block);
1207 /* If we did not make a block for the level just exited,
1208 any blocks made for inner levels
1209 (since they cannot be recorded as subblocks in that level)
1210 must be carried forward so they will later become subblocks
1211 of something else. */
1213 current_binding_level->blocks
1214 = chainon (current_binding_level->blocks, subblocks);
1216 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1217 binding contour so that they point to the appropriate construct, i.e.
1218 either to the current FUNCTION_DECL node, or else to the BLOCK node
1219 we just constructed.
1221 Note that for tagged types whose scope is just the formal parameter
1222 list for some function type specification, we can't properly set
1223 their TYPE_CONTEXTs here, because we don't have a pointer to the
1224 appropriate FUNCTION_TYPE node readily available to us. For those
1225 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1226 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1227 node which will represent the "scope" for these "parameter list local"
1231 for (link = tags; link; link = TREE_CHAIN (link))
1232 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1234 for (link = tags; link; link = TREE_CHAIN (link))
1235 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1238 TREE_USED (block) = 1;
1243 /* Delete the node BLOCK from the current binding level.
1244 This is used for the block inside a stmt expr ({...})
1245 so that the block can be reinserted where appropriate. */
1248 delete_block (block)
1252 if (current_binding_level->blocks == block)
1253 current_binding_level->blocks = TREE_CHAIN (block);
1254 for (t = current_binding_level->blocks; t;)
1256 if (TREE_CHAIN (t) == block)
1257 TREE_CHAIN (t) = TREE_CHAIN (block);
1261 TREE_CHAIN (block) = NULL;
1262 /* Clear TREE_USED which is always set by poplevel.
1263 The flag is set again if insert_block is called. */
1264 TREE_USED (block) = 0;
1267 /* Insert BLOCK at the end of the list of subblocks of the
1268 current binding level. This is used when a BIND_EXPR is expanded,
1269 to handle the BLOCK node inside the BIND_EXPR. */
1272 insert_block (block)
1275 TREE_USED (block) = 1;
1276 current_binding_level->blocks
1277 = chainon (current_binding_level->blocks, block);
1280 /* Set the BLOCK node for the innermost scope
1281 (the one we are currently in). */
1285 register tree block;
1287 current_binding_level->this_block = block;
1293 register struct binding_level *newlevel;
1295 /* Reuse or create a struct for this binding level. */
1297 if (free_binding_level)
1299 newlevel = free_binding_level;
1300 free_binding_level = free_binding_level->level_chain;
1304 newlevel = make_binding_level ();
1307 /* Add this level to the front of the chain (stack) of label levels. */
1309 newlevel->level_chain = label_level_chain;
1310 label_level_chain = newlevel;
1312 newlevel->names = named_labels;
1313 newlevel->shadowed = shadowed_labels;
1315 shadowed_labels = 0;
1321 register struct binding_level *level = label_level_chain;
1324 /* Clear out the definitions of the declared labels in this level.
1325 Leave in the list any ordinary, non-declared labels. */
1326 for (link = named_labels, prev = 0; link;)
1328 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1330 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1332 error_with_decl (TREE_VALUE (link),
1333 "label `%s' used but not defined");
1334 /* Avoid crashing later. */
1335 define_label (input_filename, lineno,
1336 DECL_NAME (TREE_VALUE (link)));
1338 else if (warn_unused_label && !TREE_USED (TREE_VALUE (link)))
1339 warning_with_decl (TREE_VALUE (link),
1340 "label `%s' defined but not used");
1341 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1343 /* Delete this element from the list. */
1344 link = TREE_CHAIN (link);
1346 TREE_CHAIN (prev) = link;
1348 named_labels = link;
1353 link = TREE_CHAIN (link);
1357 /* Bring back all the labels that were shadowed. */
1358 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1359 if (DECL_NAME (TREE_VALUE (link)) != 0)
1360 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1361 = TREE_VALUE (link);
1363 named_labels = chainon (named_labels, level->names);
1364 shadowed_labels = level->shadowed;
1366 /* Pop the current level, and free the structure for reuse. */
1367 label_level_chain = label_level_chain->level_chain;
1368 level->level_chain = free_binding_level;
1369 free_binding_level = level;
1372 /* Push a definition or a declaration of struct, union or enum tag "name".
1373 "type" should be the type node.
1374 We assume that the tag "name" is not already defined.
1376 Note that the definition may really be just a forward reference.
1377 In that case, the TYPE_SIZE will be zero. */
1380 pushtag (name, type)
1383 register struct binding_level *b;
1385 /* Find the proper binding level for this type tag. */
1387 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1392 /* Record the identifier as the type's name if it has none. */
1394 if (TYPE_NAME (type) == 0)
1395 TYPE_NAME (type) = name;
1398 b->tags = tree_cons (name, type, b->tags);
1400 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1401 tagged type we just added to the current binding level. This fake
1402 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1403 to output a representation of a tagged type, and it also gives
1404 us a convenient place to record the "scope start" address for the
1407 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1409 /* An approximation for now, so we can tell this is a function-scope tag.
1410 This will be updated in poplevel. */
1411 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1414 /* Handle when a new declaration NEWDECL
1415 has the same name as an old one OLDDECL
1416 in the same binding contour.
1417 Prints an error message if appropriate.
1419 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1420 Otherwise, return 0.
1422 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1423 and OLDDECL is in an outer binding level and should thus not be changed. */
1426 duplicate_decls (newdecl, olddecl, different_binding_level)
1427 register tree newdecl, olddecl;
1428 int different_binding_level;
1430 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1431 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1432 && DECL_INITIAL (newdecl) != 0);
1433 tree oldtype = TREE_TYPE (olddecl);
1434 tree newtype = TREE_TYPE (newdecl);
1437 if (DECL_P (olddecl))
1438 DECL_MACHINE_ATTRIBUTES (newdecl)
1439 = merge_machine_decl_attributes (olddecl, newdecl);
1441 if (TREE_CODE (newtype) == ERROR_MARK
1442 || TREE_CODE (oldtype) == ERROR_MARK)
1445 /* New decl is completely inconsistent with the old one =>
1446 tell caller to replace the old one.
1447 This is always an error except in the case of shadowing a builtin. */
1448 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1450 if (TREE_CODE (olddecl) == FUNCTION_DECL
1451 && (DECL_BUILT_IN (olddecl)
1452 || DECL_BUILT_IN_NONANSI (olddecl)))
1454 /* If you declare a built-in or predefined function name as static,
1455 the old definition is overridden,
1456 but optionally warn this was a bad choice of name. */
1457 if (!TREE_PUBLIC (newdecl))
1461 else if (DECL_BUILT_IN (olddecl))
1462 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1464 warning_with_decl (newdecl, "shadowing library function `%s'");
1466 /* Likewise, if the built-in is not ansi, then programs can
1467 override it even globally without an error. */
1468 else if (! DECL_BUILT_IN (olddecl))
1469 warning_with_decl (newdecl,
1470 "library function `%s' declared as non-function");
1472 else if (DECL_BUILT_IN_NONANSI (olddecl))
1473 warning_with_decl (newdecl,
1474 "built-in function `%s' declared as non-function");
1476 warning_with_decl (newdecl,
1477 "built-in function `%s' declared as non-function");
1481 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1482 error_with_decl (olddecl, "previous declaration of `%s'");
1488 /* For real parm decl following a forward decl,
1489 return 1 so old decl will be reused. */
1490 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1491 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1494 /* The new declaration is the same kind of object as the old one.
1495 The declarations may partially match. Print warnings if they don't
1496 match enough. Ultimately, copy most of the information from the new
1497 decl to the old one, and keep using the old one. */
1499 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1500 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1501 && DECL_INITIAL (olddecl) == 0)
1502 /* If -traditional, avoid error for redeclaring fcn
1503 after implicit decl. */
1505 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1506 && DECL_BUILT_IN (olddecl))
1508 /* A function declaration for a built-in function. */
1509 if (!TREE_PUBLIC (newdecl))
1511 /* If you declare a built-in function name as static, the
1512 built-in definition is overridden,
1513 but optionally warn this was a bad choice of name. */
1515 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1516 /* Discard the old built-in function. */
1519 else if (!types_match)
1521 /* Accept the return type of the new declaration if same modes. */
1522 tree oldreturntype = TREE_TYPE (oldtype);
1523 tree newreturntype = TREE_TYPE (newtype);
1525 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1527 /* Function types may be shared, so we can't just modify
1528 the return type of olddecl's function type. */
1530 = build_function_type (newreturntype,
1531 TYPE_ARG_TYPES (oldtype));
1533 types_match = comptypes (newtype, trytype);
1537 /* Accept harmless mismatch in first argument type also.
1539 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1540 && TYPE_ARG_TYPES (oldtype) != 0
1541 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1542 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1543 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1544 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1546 /* Function types may be shared, so we can't just modify
1547 the return type of olddecl's function type. */
1549 = build_function_type (TREE_TYPE (oldtype),
1550 tree_cons (NULL_TREE,
1551 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1552 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1554 types_match = comptypes (newtype, trytype);
1558 if (! different_binding_level)
1559 TREE_TYPE (olddecl) = oldtype;
1563 /* If types don't match for a built-in, throw away the built-in. */
1564 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1568 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1569 && DECL_SOURCE_LINE (olddecl) == 0)
1571 /* A function declaration for a predeclared function
1572 that isn't actually built in. */
1573 if (!TREE_PUBLIC (newdecl))
1575 /* If you declare it as static, the
1576 default definition is overridden. */
1579 else if (!types_match)
1581 /* If the types don't match, preserve volatility indication.
1582 Later on, we will discard everything else about the
1583 default declaration. */
1584 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1587 /* Permit char *foo () to match void *foo (...) if not pedantic,
1588 if one of them came from a system header file. */
1589 else if (!types_match
1590 && TREE_CODE (olddecl) == FUNCTION_DECL
1591 && TREE_CODE (newdecl) == FUNCTION_DECL
1592 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1593 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1594 && (DECL_IN_SYSTEM_HEADER (olddecl)
1595 || DECL_IN_SYSTEM_HEADER (newdecl))
1596 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1597 && TYPE_ARG_TYPES (oldtype) == 0
1598 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1599 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1601 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1602 && TYPE_ARG_TYPES (newtype) == 0
1603 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1604 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1607 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1608 /* Make sure we keep void * as ret type, not char *. */
1609 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1610 TREE_TYPE (newdecl) = newtype = oldtype;
1612 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1613 we will come back here again. */
1614 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1616 else if (!types_match
1617 /* Permit char *foo (int, ...); followed by char *foo ();
1619 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1621 /* Return types must still match. */
1622 && comptypes (TREE_TYPE (oldtype),
1623 TREE_TYPE (newtype))
1624 && TYPE_ARG_TYPES (newtype) == 0))
1626 error_with_decl (newdecl, "conflicting types for `%s'");
1627 /* Check for function type mismatch
1628 involving an empty arglist vs a nonempty one. */
1629 if (TREE_CODE (olddecl) == FUNCTION_DECL
1630 && comptypes (TREE_TYPE (oldtype),
1631 TREE_TYPE (newtype))
1632 && ((TYPE_ARG_TYPES (oldtype) == 0
1633 && DECL_INITIAL (olddecl) == 0)
1635 (TYPE_ARG_TYPES (newtype) == 0
1636 && DECL_INITIAL (newdecl) == 0)))
1638 /* Classify the problem further. */
1639 register tree t = TYPE_ARG_TYPES (oldtype);
1641 t = TYPE_ARG_TYPES (newtype);
1642 for (; t; t = TREE_CHAIN (t))
1644 register tree type = TREE_VALUE (t);
1646 if (TREE_CHAIN (t) == 0
1647 && TYPE_MAIN_VARIANT (type) != void_type_node)
1649 error ("A parameter list with an ellipsis can't match an empty parameter name list declaration.");
1653 if (simple_type_promotes_to (type) != NULL_TREE)
1655 error ("An argument type that has a default promotion can't match an empty parameter name list declaration.");
1660 error_with_decl (olddecl, "previous declaration of `%s'");
1664 errmsg = redeclaration_error_message (newdecl, olddecl);
1670 error_with_decl (newdecl, "redefinition of `%s'");
1673 error_with_decl (newdecl, "redeclaration of `%s'");
1676 error_with_decl (newdecl, "conflicting declarations of `%s'");
1682 error_with_decl (olddecl,
1683 ((DECL_INITIAL (olddecl)
1684 && current_binding_level == global_binding_level)
1685 ? "`%s' previously defined here"
1686 : "`%s' previously declared here"));
1688 else if (TREE_CODE (newdecl) == TYPE_DECL
1689 && (DECL_IN_SYSTEM_HEADER (olddecl)
1690 || DECL_IN_SYSTEM_HEADER (newdecl)))
1692 warning_with_decl (newdecl, "redefinition of `%s'");
1695 ((DECL_INITIAL (olddecl)
1696 && current_binding_level == global_binding_level)
1697 ? "`%s' previously defined here"
1698 : "`%s' previously declared here"));
1700 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1701 && DECL_INITIAL (olddecl) != 0
1702 && TYPE_ARG_TYPES (oldtype) == 0
1703 && TYPE_ARG_TYPES (newtype) != 0
1704 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1706 register tree type, parm;
1708 /* Prototype decl follows defn w/o prototype. */
1710 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1711 type = TYPE_ARG_TYPES (newtype),
1714 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1716 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1717 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1719 warning_with_decl (newdecl, "prototype for `%s' follows");
1720 warning_with_decl (olddecl, "non-prototype definition here");
1723 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1724 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1726 error_with_decl (newdecl,
1727 "prototype for `%s' follows and number of arguments doesn't match");
1728 error_with_decl (olddecl, "non-prototype definition here");
1732 /* Type for passing arg must be consistent
1733 with that declared for the arg. */
1734 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1735 /* If -traditional, allow `unsigned int' instead of `int'
1736 in the prototype. */
1737 && (! (flag_traditional
1738 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1739 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1741 error_with_decl (newdecl,
1742 "prototype for `%s' follows and argument %d doesn't match",
1744 error_with_decl (olddecl, "non-prototype definition here");
1750 /* Warn about mismatches in various flags. */
1753 /* Warn if function is now inline
1754 but was previously declared not inline and has been called. */
1755 if (TREE_CODE (olddecl) == FUNCTION_DECL
1756 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1757 && TREE_USED (olddecl))
1758 warning_with_decl (newdecl,
1759 "`%s' declared inline after being called");
1760 if (TREE_CODE (olddecl) == FUNCTION_DECL
1761 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1762 && DECL_INITIAL (olddecl) != 0)
1763 warning_with_decl (newdecl,
1764 "`%s' declared inline after its definition");
1766 /* If pedantic, warn when static declaration follows a non-static
1767 declaration. Otherwise, do so only for functions. */
1768 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1769 && TREE_PUBLIC (olddecl)
1770 && !TREE_PUBLIC (newdecl))
1771 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1773 /* If warn_traditional, warn when a non-static function
1774 declaration follows a static one. */
1775 if (warn_traditional && !in_system_header
1776 && TREE_CODE (olddecl) == FUNCTION_DECL
1777 && !TREE_PUBLIC (olddecl)
1778 && TREE_PUBLIC (newdecl))
1779 warning_with_decl (newdecl, "non-static declaration for `%s' follows static");
1781 /* Warn when const declaration follows a non-const
1782 declaration, but not for functions. */
1783 if (TREE_CODE (olddecl) != FUNCTION_DECL
1784 && !TREE_READONLY (olddecl)
1785 && TREE_READONLY (newdecl))
1786 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1787 /* These bits are logically part of the type, for variables.
1788 But not for functions
1789 (where qualifiers are not valid ANSI anyway). */
1790 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1791 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1792 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1793 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1797 /* Optionally warn about more than one declaration for the same name. */
1798 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1799 /* Don't warn about a function declaration
1800 followed by a definition. */
1801 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1802 && DECL_INITIAL (olddecl) == 0)
1803 /* Don't warn about extern decl followed by (tentative) definition. */
1804 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1806 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1807 warning_with_decl (olddecl, "previous declaration of `%s'");
1810 /* Copy all the DECL_... slots specified in the new decl
1811 except for any that we copy here from the old type.
1813 Past this point, we don't change OLDTYPE and NEWTYPE
1814 even if we change the types of NEWDECL and OLDDECL. */
1818 /* When copying info to olddecl, we store into write_olddecl
1819 instead. This allows us to avoid modifying olddecl when
1820 different_binding_level is true. */
1821 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1823 /* Merge the data types specified in the two decls. */
1824 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1826 if (different_binding_level)
1828 = build_type_attribute_variant
1830 merge_attributes (TYPE_ATTRIBUTES (newtype),
1831 TYPE_ATTRIBUTES (oldtype)));
1834 = TREE_TYPE (olddecl)
1835 = common_type (newtype, oldtype);
1838 /* Lay the type out, unless already done. */
1839 if (oldtype != TREE_TYPE (newdecl))
1841 if (TREE_TYPE (newdecl) != error_mark_node)
1842 layout_type (TREE_TYPE (newdecl));
1843 if (TREE_CODE (newdecl) != FUNCTION_DECL
1844 && TREE_CODE (newdecl) != TYPE_DECL
1845 && TREE_CODE (newdecl) != CONST_DECL)
1846 layout_decl (newdecl, 0);
1850 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1851 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1852 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1853 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1854 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1855 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1857 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1858 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1862 /* Keep the old rtl since we can safely use it. */
1863 DECL_RTL (newdecl) = DECL_RTL (olddecl);
1865 /* Merge the type qualifiers. */
1866 if (TREE_CODE (olddecl) == FUNCTION_DECL
1867 && DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1868 && ! TREE_THIS_VOLATILE (newdecl))
1869 TREE_THIS_VOLATILE (write_olddecl) = 0;
1871 if (TREE_READONLY (newdecl))
1872 TREE_READONLY (write_olddecl) = 1;
1874 if (TREE_THIS_VOLATILE (newdecl))
1876 TREE_THIS_VOLATILE (write_olddecl) = 1;
1877 if (TREE_CODE (newdecl) == VAR_DECL
1878 /* If an automatic variable is re-declared in the same
1879 function scope, but the old declaration was not
1880 volatile, make_var_volatile() would crash because the
1881 variable would have been assigned to a pseudo, not a
1882 MEM. Since this duplicate declaration is invalid
1883 anyway, we just skip the call. */
1885 make_var_volatile (newdecl);
1888 /* Keep source location of definition rather than declaration. */
1889 /* When called with different_binding_level set, keep the old
1890 information so that meaningful diagnostics can be given. */
1891 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1892 && ! different_binding_level)
1894 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1895 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1898 /* Merge the unused-warning information. */
1899 if (DECL_IN_SYSTEM_HEADER (olddecl))
1900 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1901 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1902 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1904 /* Merge the initialization information. */
1905 /* When called with different_binding_level set, don't copy over
1906 DECL_INITIAL, so that we don't accidentally change function
1907 declarations into function definitions. */
1908 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1909 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1911 /* Merge the section attribute.
1912 We want to issue an error if the sections conflict but that must be
1913 done later in decl_attributes since we are called before attributes
1915 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1916 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1918 /* Copy the assembler name.
1919 Currently, it can only be defined in the prototype. */
1920 DECL_ASSEMBLER_NAME (newdecl) = DECL_ASSEMBLER_NAME (olddecl);
1922 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1924 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1925 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1927 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1928 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1929 DECL_NO_CHECK_MEMORY_USAGE (newdecl)
1930 |= DECL_NO_CHECK_MEMORY_USAGE (olddecl);
1931 DECL_NO_LIMIT_STACK (newdecl)
1932 |= DECL_NO_LIMIT_STACK (olddecl);
1935 /* If cannot merge, then use the new type and qualifiers,
1936 and don't preserve the old rtl. */
1937 else if (! different_binding_level)
1939 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1940 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1941 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1942 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1945 /* Merge the storage class information. */
1946 DECL_WEAK (newdecl) |= DECL_WEAK (olddecl);
1947 /* For functions, static overrides non-static. */
1948 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1950 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1951 /* This is since we don't automatically
1952 copy the attributes of NEWDECL into OLDDECL. */
1953 /* No need to worry about different_binding_level here because
1954 then TREE_PUBLIC (newdecl) was true. */
1955 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1956 /* If this clears `static', clear it in the identifier too. */
1957 if (! TREE_PUBLIC (olddecl))
1958 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1960 if (DECL_EXTERNAL (newdecl))
1962 if (! different_binding_level)
1964 /* Don't mess with these flags on local externs; they remain
1965 external even if there's a declaration at file scope which
1967 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1968 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1970 /* An extern decl does not override previous storage class. */
1971 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1972 if (! DECL_EXTERNAL (newdecl))
1973 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1977 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1978 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1981 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1983 /* If either decl says `inline', this fn is inline,
1984 unless its definition was passed already. */
1985 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
1986 DECL_INLINE (olddecl) = 1;
1988 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1990 if (DECL_BUILT_IN (olddecl))
1992 /* Get rid of any built-in function if new arg types don't match it
1993 or if we have a function definition. */
1994 if (! types_match || new_is_definition)
1996 if (! different_binding_level)
1998 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1999 DECL_BUILT_IN_CLASS (olddecl) = NOT_BUILT_IN;
2004 /* If redeclaring a builtin function, and not a definition,
2005 it stays built in. */
2006 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2007 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2010 /* Also preserve various other info from the definition. */
2011 else if (! new_is_definition)
2012 DECL_FRAME_SIZE (newdecl) = DECL_FRAME_SIZE (olddecl);
2013 if (! new_is_definition)
2015 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2016 /* When called with different_binding_level set, don't copy over
2017 DECL_INITIAL, so that we don't accidentally change function
2018 declarations into function definitions. */
2019 if (! different_binding_level)
2020 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2021 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
2022 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2023 if (DECL_INLINE (newdecl))
2024 DECL_ABSTRACT_ORIGIN (newdecl) = DECL_ABSTRACT_ORIGIN (olddecl);
2027 if (different_binding_level)
2030 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2031 But preserve OLDDECL's DECL_UID. */
2033 register unsigned olddecl_uid = DECL_UID (olddecl);
2035 memcpy ((char *) olddecl + sizeof (struct tree_common),
2036 (char *) newdecl + sizeof (struct tree_common),
2037 sizeof (struct tree_decl) - sizeof (struct tree_common));
2038 DECL_UID (olddecl) = olddecl_uid;
2041 /* NEWDECL contains the merged attribute lists.
2042 Update OLDDECL to be the same. */
2043 DECL_MACHINE_ATTRIBUTES (olddecl) = DECL_MACHINE_ATTRIBUTES (newdecl);
2048 /* Record a decl-node X as belonging to the current lexical scope.
2049 Check for errors (such as an incompatible declaration for the same
2050 name already seen in the same scope).
2052 Returns either X or an old decl for the same name.
2053 If an old decl is returned, it may have been smashed
2054 to agree with what X says. */
2061 register tree name = DECL_NAME (x);
2062 register struct binding_level *b = current_binding_level;
2064 DECL_CONTEXT (x) = current_function_decl;
2065 /* A local extern declaration for a function doesn't constitute nesting.
2066 A local auto declaration does, since it's a forward decl
2067 for a nested function coming later. */
2068 if ((TREE_CODE (x) == FUNCTION_DECL || TREE_CODE (x) == VAR_DECL)
2069 && DECL_INITIAL (x) == 0 && DECL_EXTERNAL (x))
2070 DECL_CONTEXT (x) = 0;
2072 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
2073 && x != IDENTIFIER_IMPLICIT_DECL (name)
2074 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
2075 && !DECL_IN_SYSTEM_HEADER (x))
2076 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
2082 int different_binding_level = 0;
2084 t = lookup_name_current_level (name);
2085 /* Don't type check externs here when -traditional. This is so that
2086 code with conflicting declarations inside blocks will get warnings
2087 not errors. X11 for instance depends on this. */
2088 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
2090 t = IDENTIFIER_GLOBAL_VALUE (name);
2091 /* Type decls at global scope don't conflict with externs declared
2092 inside lexical blocks. */
2093 if (t && TREE_CODE (t) == TYPE_DECL)
2095 different_binding_level = 1;
2097 if (t != 0 && t == error_mark_node)
2098 /* error_mark_node is 0 for a while during initialization! */
2101 error_with_decl (x, "`%s' used prior to declaration");
2106 file = DECL_SOURCE_FILE (t);
2107 line = DECL_SOURCE_LINE (t);
2110 /* If this decl is `static' and an implicit decl was seen previously,
2111 warn. But don't complain if -traditional,
2112 since traditional compilers don't complain. */
2113 if (! flag_traditional && TREE_PUBLIC (name)
2114 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2115 sets this for all functions. */
2116 && ! TREE_PUBLIC (x)
2117 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2118 /* We used to warn also for explicit extern followed by static,
2119 but sometimes you need to do it that way. */
2120 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2122 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2123 IDENTIFIER_POINTER (name));
2124 pedwarn_with_file_and_line
2125 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2126 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2127 "previous declaration of `%s'",
2128 IDENTIFIER_POINTER (name));
2129 TREE_THIS_VOLATILE (name) = 1;
2132 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2134 if (TREE_CODE (t) == PARM_DECL)
2136 /* Don't allow more than one "real" duplicate
2137 of a forward parm decl. */
2138 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2144 /* If we are processing a typedef statement, generate a whole new
2145 ..._TYPE node (which will be just an variant of the existing
2146 ..._TYPE node with identical properties) and then install the
2147 TYPE_DECL node generated to represent the typedef name as the
2148 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2150 The whole point here is to end up with a situation where each
2151 and every ..._TYPE node the compiler creates will be uniquely
2152 associated with AT MOST one node representing a typedef name.
2153 This way, even though the compiler substitutes corresponding
2154 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2155 early on, later parts of the compiler can always do the reverse
2156 translation and get back the corresponding typedef name. For
2159 typedef struct S MY_TYPE;
2162 Later parts of the compiler might only know that `object' was of
2163 type `struct S' if it were not for code just below. With this
2164 code however, later parts of the compiler see something like:
2166 struct S' == struct S
2167 typedef struct S' MY_TYPE;
2170 And they can then deduce (from the node for type struct S') that
2171 the original object declaration was:
2175 Being able to do this is important for proper support of protoize,
2176 and also for generating precise symbolic debugging information
2177 which takes full account of the programmer's (typedef) vocabulary.
2179 Obviously, we don't want to generate a duplicate ..._TYPE node if
2180 the TYPE_DECL node that we are now processing really represents a
2181 standard built-in type.
2183 Since all standard types are effectively declared at line zero
2184 in the source file, we can easily check to see if we are working
2185 on a standard type by checking the current value of lineno. */
2187 if (TREE_CODE (x) == TYPE_DECL)
2189 if (DECL_SOURCE_LINE (x) == 0)
2191 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2192 TYPE_NAME (TREE_TYPE (x)) = x;
2194 else if (TREE_TYPE (x) != error_mark_node
2195 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2197 tree tt = TREE_TYPE (x);
2198 DECL_ORIGINAL_TYPE (x) = tt;
2199 tt = build_type_copy (tt);
2201 TREE_USED (tt) = TREE_USED (x);
2206 /* Multiple external decls of the same identifier ought to match.
2207 Check against both global declarations (when traditional) and out of
2208 scope (limbo) block level declarations.
2210 We get warnings about inline functions where they are defined.
2211 Avoid duplicate warnings where they are used. */
2213 && ! (TREE_CODE (x) == FUNCTION_DECL && DECL_INLINE (x)))
2217 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2218 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2219 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2220 decl = IDENTIFIER_GLOBAL_VALUE (name);
2221 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2222 /* Decls in limbo are always extern, so no need to check that. */
2223 decl = IDENTIFIER_LIMBO_VALUE (name);
2227 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2228 /* If old decl is built-in, we already warned if we should. */
2229 && !DECL_BUILT_IN (decl))
2231 pedwarn_with_decl (x,
2232 "type mismatch with previous external decl");
2233 pedwarn_with_decl (decl, "previous external decl of `%s'");
2237 /* If a function has had an implicit declaration, and then is defined,
2238 make sure they are compatible. */
2240 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2241 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2242 && TREE_CODE (x) == FUNCTION_DECL
2243 && ! comptypes (TREE_TYPE (x),
2244 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2246 warning_with_decl (x, "type mismatch with previous implicit declaration");
2247 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2248 "previous implicit declaration of `%s'");
2251 /* In PCC-compatibility mode, extern decls of vars with no current decl
2252 take effect at top level no matter where they are. */
2253 if (flag_traditional && DECL_EXTERNAL (x)
2254 && lookup_name (name) == 0)
2256 tree type = TREE_TYPE (x);
2258 /* But don't do this if the type contains temporary nodes. */
2261 if (type == error_mark_node)
2263 if (TYPE_CONTEXT (type))
2265 warning_with_decl (x, "type of external `%s' is not global");
2266 /* By exiting the loop early, we leave TYPE nonzero,
2267 and thus prevent globalization of the decl. */
2270 else if (TREE_CODE (type) == FUNCTION_TYPE
2271 && TYPE_ARG_TYPES (type) != 0)
2272 /* The types might not be truly local,
2273 but the list of arg types certainly is temporary.
2274 Since prototypes are nontraditional,
2275 ok not to do the traditional thing. */
2277 type = TREE_TYPE (type);
2281 b = global_binding_level;
2284 /* This name is new in its binding level.
2285 Install the new declaration and return it. */
2286 if (b == global_binding_level)
2288 /* Install a global value. */
2290 /* If the first global decl has external linkage,
2291 warn if we later see static one. */
2292 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2293 TREE_PUBLIC (name) = 1;
2295 IDENTIFIER_GLOBAL_VALUE (name) = x;
2297 /* We no longer care about any previous block level declarations. */
2298 IDENTIFIER_LIMBO_VALUE (name) = 0;
2300 /* Don't forget if the function was used via an implicit decl. */
2301 if (IDENTIFIER_IMPLICIT_DECL (name)
2302 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2303 TREE_USED (x) = 1, TREE_USED (name) = 1;
2305 /* Don't forget if its address was taken in that way. */
2306 if (IDENTIFIER_IMPLICIT_DECL (name)
2307 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2308 TREE_ADDRESSABLE (x) = 1;
2310 /* Warn about mismatches against previous implicit decl. */
2311 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2312 /* If this real decl matches the implicit, don't complain. */
2313 && ! (TREE_CODE (x) == FUNCTION_DECL
2314 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2315 == integer_type_node)))
2316 pedwarn ("`%s' was previously implicitly declared to return `int'",
2317 IDENTIFIER_POINTER (name));
2319 /* If this decl is `static' and an `extern' was seen previously,
2320 that is erroneous. */
2321 if (TREE_PUBLIC (name)
2322 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2324 /* Okay to redeclare an ANSI built-in as static. */
2325 if (t != 0 && DECL_BUILT_IN (t))
2327 /* Okay to declare a non-ANSI built-in as anything. */
2328 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2330 /* Okay to have global type decl after an earlier extern
2331 declaration inside a lexical block. */
2332 else if (TREE_CODE (x) == TYPE_DECL)
2334 else if (IDENTIFIER_IMPLICIT_DECL (name))
2336 if (! TREE_THIS_VOLATILE (name))
2337 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2338 IDENTIFIER_POINTER (name));
2341 pedwarn ("`%s' was declared `extern' and later `static'",
2342 IDENTIFIER_POINTER (name));
2347 /* Here to install a non-global value. */
2348 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2349 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2351 IDENTIFIER_LOCAL_VALUE (name) = x;
2353 /* If this is an extern function declaration, see if we
2354 have a global definition or declaration for the function. */
2357 && TREE_CODE (x) == FUNCTION_DECL
2358 && TREE_CODE (oldglobal) == FUNCTION_DECL
2359 && DECL_EXTERNAL (x) && ! DECL_INLINE (x))
2361 /* We have one. Their types must agree. */
2362 if (! comptypes (TREE_TYPE (x),
2363 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2364 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2367 /* Inner extern decl is inline if global one is.
2368 Copy enough to really inline it. */
2369 if (DECL_INLINE (oldglobal))
2371 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2372 DECL_INITIAL (x) = (current_function_decl == oldglobal
2373 ? 0 : DECL_INITIAL (oldglobal));
2374 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2375 DECL_FRAME_SIZE (x) = DECL_FRAME_SIZE (oldglobal);
2376 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2377 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2378 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2379 DECL_ABSTRACT_ORIGIN (x)
2380 = DECL_ABSTRACT_ORIGIN (oldglobal);
2382 /* Inner extern decl is built-in if global one is. */
2383 if (DECL_BUILT_IN (oldglobal))
2385 DECL_BUILT_IN_CLASS (x) = DECL_BUILT_IN_CLASS (oldglobal);
2386 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2388 /* Keep the arg types from a file-scope fcn defn. */
2389 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2390 && DECL_INITIAL (oldglobal)
2391 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2392 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2397 /* This case is probably sometimes the right thing to do. */
2398 /* If we have a local external declaration,
2399 then any file-scope declaration should not
2400 have been static. */
2401 if (oldlocal == 0 && oldglobal != 0
2402 && !TREE_PUBLIC (oldglobal)
2403 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2404 warning ("`%s' locally external but globally static",
2405 IDENTIFIER_POINTER (name));
2408 /* If we have a local external declaration,
2409 and no file-scope declaration has yet been seen,
2410 then if we later have a file-scope decl it must not be static. */
2412 && DECL_EXTERNAL (x)
2416 TREE_PUBLIC (name) = 1;
2418 /* Save this decl, so that we can do type checking against
2419 other decls after it falls out of scope.
2421 Only save it once. This prevents temporary decls created in
2422 expand_inline_function from being used here, since this
2423 will have been set when the inline function was parsed.
2424 It also helps give slightly better warnings. */
2425 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2426 IDENTIFIER_LIMBO_VALUE (name) = x;
2429 /* Warn if shadowing an argument at the top level of the body. */
2430 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2431 /* This warning doesn't apply to the parms of a nested fcn. */
2432 && ! current_binding_level->parm_flag
2433 /* Check that this is one level down from the parms. */
2434 && current_binding_level->level_chain->parm_flag
2435 /* Check that the decl being shadowed
2436 comes from the parm level, one level up. */
2437 && chain_member (oldlocal, current_binding_level->level_chain->names))
2439 if (TREE_CODE (oldlocal) == PARM_DECL)
2440 pedwarn ("declaration of `%s' shadows a parameter",
2441 IDENTIFIER_POINTER (name));
2443 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2444 IDENTIFIER_POINTER (name));
2447 /* Maybe warn if shadowing something else. */
2448 else if (warn_shadow && !DECL_EXTERNAL (x)
2449 /* No shadow warnings for internally generated vars. */
2450 && DECL_SOURCE_LINE (x) != 0
2451 /* No shadow warnings for vars made for inlining. */
2452 && ! DECL_FROM_INLINE (x))
2454 const char *id = IDENTIFIER_POINTER (name);
2456 if (TREE_CODE (x) == PARM_DECL
2457 && current_binding_level->level_chain->parm_flag)
2458 /* Don't warn about the parm names in function declarator
2459 within a function declarator.
2460 It would be nice to avoid warning in any function
2461 declarator in a declaration, as opposed to a definition,
2462 but there is no way to tell it's not a definition. */
2464 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2465 warning ("declaration of `%s' shadows a parameter", id);
2466 else if (oldlocal != 0)
2467 warning ("declaration of `%s' shadows previous local", id);
2468 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2469 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2470 warning ("declaration of `%s' shadows global declaration", id);
2473 /* If storing a local value, there may already be one (inherited).
2474 If so, record it for restoration when this binding level ends. */
2476 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2479 /* Keep count of variables in this level with incomplete type.
2480 If the input is erroneous, we can have error_mark in the type
2481 slot (e.g. "f(void a, ...)") - that doesn't count as an
2483 if (TREE_TYPE (x) != error_mark_node
2484 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2488 /* Put decls on list in reverse order.
2489 We will reverse them later if necessary. */
2490 TREE_CHAIN (x) = b->names;
2496 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2499 pushdecl_top_level (x)
2503 register struct binding_level *b = current_binding_level;
2505 current_binding_level = global_binding_level;
2507 current_binding_level = b;
2511 /* Generate an implicit declaration for identifier FUNCTIONID
2512 as a function of type int (). Print a warning if appropriate. */
2515 implicitly_declare (functionid)
2519 int traditional_warning = 0;
2520 /* Only one "implicit declaration" warning per identifier. */
2521 int implicit_warning;
2523 /* We used to reuse an old implicit decl here,
2524 but this loses with inline functions because it can clobber
2525 the saved decl chains. */
2527 if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2528 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2531 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2533 /* Warn of implicit decl following explicit local extern decl.
2534 This is probably a program designed for traditional C. */
2535 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2536 traditional_warning = 1;
2538 /* Warn once of an implicit declaration. */
2539 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2541 DECL_EXTERNAL (decl) = 1;
2542 TREE_PUBLIC (decl) = 1;
2544 /* Record that we have an implicit decl and this is it. */
2545 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2547 /* ANSI standard says implicit declarations are in the innermost block.
2548 So we record the decl in the standard fashion.
2549 If flag_traditional is set, pushdecl does it top-level. */
2552 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2553 maybe_objc_check_decl (decl);
2555 rest_of_decl_compilation (decl, NULL_PTR, 0, 0);
2557 if (implicit_warning)
2558 implicit_decl_warning (functionid);
2559 else if (warn_traditional && traditional_warning)
2560 warning ("function `%s' was previously declared within a block",
2561 IDENTIFIER_POINTER (functionid));
2563 /* Write a record describing this implicit function declaration to the
2564 prototypes file (if requested). */
2566 gen_aux_info_record (decl, 0, 1, 0);
2572 implicit_decl_warning (id)
2575 const char *name = IDENTIFIER_POINTER (id);
2576 if (mesg_implicit_function_declaration == 2)
2577 error ("implicit declaration of function `%s'", name);
2578 else if (mesg_implicit_function_declaration == 1)
2579 warning ("implicit declaration of function `%s'", name);
2582 /* Return zero if the declaration NEWDECL is valid
2583 when the declaration OLDDECL (assumed to be for the same name)
2584 has already been seen.
2585 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
2586 and 3 if it is a conflicting declaration. */
2589 redeclaration_error_message (newdecl, olddecl)
2590 tree newdecl, olddecl;
2592 if (TREE_CODE (newdecl) == TYPE_DECL)
2594 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2596 /* pushdecl creates distinct types for TYPE_DECLs by calling
2597 build_type_copy, so the above comparison generally fails. We do
2598 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2599 is equivalent to what this code used to do before the build_type_copy
2600 call. The variant type distinction should not matter for traditional
2601 code, because it doesn't have type qualifiers. */
2602 if (flag_traditional
2603 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
2605 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2609 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2611 /* Declarations of functions can insist on internal linkage
2612 but they can't be inconsistent with internal linkage,
2613 so there can be no error on that account.
2614 However defining the same name twice is no good. */
2615 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2616 /* However, defining once as extern inline and a second
2617 time in another way is ok. */
2618 && ! (DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2619 && ! (DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2623 else if (DECL_CONTEXT (newdecl) == NULL_TREE)
2625 /* Objects declared at top level: */
2626 /* If at least one is a reference, it's ok. */
2627 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2629 /* Reject two definitions. */
2630 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2632 /* Now we have two tentative defs, or one tentative and one real def. */
2633 /* Insist that the linkage match. */
2634 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2638 else if (current_binding_level->parm_flag
2639 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2643 /* Newdecl has block scope. If olddecl has block scope also, then
2644 reject two definitions, and reject a definition together with an
2645 external reference. Otherwise, it is OK, because newdecl must
2646 be an extern reference to olddecl. */
2647 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2648 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2654 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2655 Create one if none exists so far for the current function.
2656 This function is called for both label definitions and label references. */
2662 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2664 if (current_function_decl == 0)
2666 error ("label %s referenced outside of any function",
2667 IDENTIFIER_POINTER (id));
2671 /* Use a label already defined or ref'd with this name. */
2674 /* But not if it is inherited and wasn't declared to be inheritable. */
2675 if (DECL_CONTEXT (decl) != current_function_decl
2676 && ! C_DECLARED_LABEL_FLAG (decl))
2677 return shadow_label (id);
2681 decl = build_decl (LABEL_DECL, id, void_type_node);
2683 /* A label not explicitly declared must be local to where it's ref'd. */
2684 DECL_CONTEXT (decl) = current_function_decl;
2686 DECL_MODE (decl) = VOIDmode;
2688 /* Say where one reference is to the label,
2689 for the sake of the error if it is not defined. */
2690 DECL_SOURCE_LINE (decl) = lineno;
2691 DECL_SOURCE_FILE (decl) = input_filename;
2693 IDENTIFIER_LABEL_VALUE (id) = decl;
2695 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2700 /* Make a label named NAME in the current function,
2701 shadowing silently any that may be inherited from containing functions
2702 or containing scopes.
2704 Note that valid use, if the label being shadowed
2705 comes from another scope in the same function,
2706 requires calling declare_nonlocal_label right away. */
2712 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2718 /* Check to make sure that the label hasn't already been declared
2719 at this label scope */
2720 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2721 if (TREE_VALUE (dup) == decl)
2723 error ("duplicate label declaration `%s'",
2724 IDENTIFIER_POINTER (name));
2725 error_with_decl (TREE_VALUE (dup),
2726 "this is a previous declaration");
2727 /* Just use the previous declaration. */
2728 return lookup_label (name);
2731 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2732 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2735 return lookup_label (name);
2738 /* Define a label, specifying the location in the source file.
2739 Return the LABEL_DECL node for the label, if the definition is valid.
2740 Otherwise return 0. */
2743 define_label (filename, line, name)
2744 const char *filename;
2748 tree decl = lookup_label (name);
2750 /* If label with this name is known from an outer context, shadow it. */
2751 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2753 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2754 IDENTIFIER_LABEL_VALUE (name) = 0;
2755 decl = lookup_label (name);
2758 if (warn_traditional && !in_system_header && lookup_name (name))
2759 warning_with_file_and_line (filename, line,
2760 "traditional C lacks a separate namespace for labels, identifier `%s' conflicts",
2761 IDENTIFIER_POINTER (name));
2763 if (DECL_INITIAL (decl) != 0)
2765 error_with_file_and_line (filename, line, "duplicate label `%s'",
2766 IDENTIFIER_POINTER (name));
2771 /* Mark label as having been defined. */
2772 DECL_INITIAL (decl) = error_mark_node;
2773 /* Say where in the source. */
2774 DECL_SOURCE_FILE (decl) = filename;
2775 DECL_SOURCE_LINE (decl) = line;
2780 /* Return the list of declarations of the current level.
2781 Note that this list is in reverse order unless/until
2782 you nreverse it; and when you do nreverse it, you must
2783 store the result back using `storedecls' or you will lose. */
2788 return current_binding_level->names;
2791 /* Return the list of type-tags (for structs, etc) of the current level. */
2796 return current_binding_level->tags;
2799 /* Store the list of declarations of the current level.
2800 This is done for the parameter declarations of a function being defined,
2801 after they are modified in the light of any missing parameters. */
2807 current_binding_level->names = decls;
2810 /* Similarly, store the list of tags of the current level. */
2816 current_binding_level->tags = tags;
2819 /* Given NAME, an IDENTIFIER_NODE,
2820 return the structure (or union or enum) definition for that name.
2821 Searches binding levels from BINDING_LEVEL up to the global level.
2822 If THISLEVEL_ONLY is nonzero, searches only the specified context
2823 (but skips any tag-transparent contexts to find one that is
2824 meaningful for tags).
2825 CODE says which kind of type the caller wants;
2826 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2827 If the wrong kind of type is found, an error is reported. */
2830 lookup_tag (code, name, binding_level, thislevel_only)
2831 enum tree_code code;
2832 struct binding_level *binding_level;
2836 register struct binding_level *level;
2838 for (level = binding_level; level; level = level->level_chain)
2841 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2843 if (TREE_PURPOSE (tail) == name)
2845 if (TREE_CODE (TREE_VALUE (tail)) != code)
2847 /* Definition isn't the kind we were looking for. */
2848 pending_invalid_xref = name;
2849 pending_invalid_xref_file = input_filename;
2850 pending_invalid_xref_line = lineno;
2852 return TREE_VALUE (tail);
2855 if (thislevel_only && ! level->tag_transparent)
2861 /* Print an error message now
2862 for a recent invalid struct, union or enum cross reference.
2863 We don't print them immediately because they are not invalid
2864 when used in the `struct foo;' construct for shadowing. */
2867 pending_xref_error ()
2869 if (pending_invalid_xref != 0)
2870 error_with_file_and_line (pending_invalid_xref_file,
2871 pending_invalid_xref_line,
2872 "`%s' defined as wrong kind of tag",
2873 IDENTIFIER_POINTER (pending_invalid_xref));
2874 pending_invalid_xref = 0;
2877 /* Given a type, find the tag that was defined for it and return the tag name.
2878 Otherwise return 0. */
2881 lookup_tag_reverse (type)
2884 register struct binding_level *level;
2886 for (level = current_binding_level; level; level = level->level_chain)
2889 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2891 if (TREE_VALUE (tail) == type)
2892 return TREE_PURPOSE (tail);
2898 /* Look up NAME in the current binding level and its superiors
2899 in the namespace of variables, functions and typedefs.
2900 Return a ..._DECL node of some kind representing its definition,
2901 or return 0 if it is undefined. */
2909 if (current_binding_level != global_binding_level
2910 && IDENTIFIER_LOCAL_VALUE (name))
2911 val = IDENTIFIER_LOCAL_VALUE (name);
2913 val = IDENTIFIER_GLOBAL_VALUE (name);
2917 /* Similar to `lookup_name' but look only at current binding level. */
2920 lookup_name_current_level (name)
2925 if (current_binding_level == global_binding_level)
2926 return IDENTIFIER_GLOBAL_VALUE (name);
2928 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2931 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2932 if (DECL_NAME (t) == name)
2938 /* Mark ARG for GC. */
2941 mark_binding_level (arg)
2944 struct binding_level *level = *(struct binding_level **) arg;
2946 for (; level != 0; level = level->level_chain)
2948 ggc_mark_tree (level->names);
2949 ggc_mark_tree (level->tags);
2950 ggc_mark_tree (level->shadowed);
2951 ggc_mark_tree (level->blocks);
2952 ggc_mark_tree (level->this_block);
2953 ggc_mark_tree (level->parm_order);
2957 /* Create the predefined scalar types of C,
2958 and some nodes representing standard constants (0, 1, (void *) 0).
2959 Initialize the global binding level.
2960 Make definitions for built-in primitive functions. */
2963 init_decl_processing ()
2965 register tree endlink;
2966 tree ptr_ftype_void, ptr_ftype_ptr;
2967 int wchar_type_size;
2968 tree array_domain_type;
2971 current_function_decl = NULL;
2972 named_labels = NULL;
2973 current_binding_level = NULL_BINDING_LEVEL;
2974 free_binding_level = NULL_BINDING_LEVEL;
2976 /* Make the binding_level structure for global names. */
2978 global_binding_level = current_binding_level;
2980 build_common_tree_nodes (flag_signed_char);
2982 /* Define `int' and `char' first so that dbx will output them first. */
2983 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_INT],
2984 integer_type_node));
2985 pushdecl (build_decl (TYPE_DECL, get_identifier ("char"),
2987 pushdecl (build_decl (TYPE_DECL, get_identifier ("long int"),
2988 long_integer_type_node));
2989 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned int"),
2990 unsigned_type_node));
2991 pushdecl (build_decl (TYPE_DECL, get_identifier ("long unsigned int"),
2992 long_unsigned_type_node));
2993 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long int"),
2994 long_long_integer_type_node));
2995 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long unsigned int"),
2996 long_long_unsigned_type_node));
2997 pushdecl (build_decl (TYPE_DECL, get_identifier ("short int"),
2998 short_integer_type_node));
2999 pushdecl (build_decl (TYPE_DECL, get_identifier ("short unsigned int"),
3000 short_unsigned_type_node));
3001 pushdecl (build_decl (TYPE_DECL, get_identifier ("signed char"),
3002 signed_char_type_node));
3003 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned char"),
3004 unsigned_char_type_node));
3005 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intQI_type_node));
3006 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intHI_type_node));
3007 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intSI_type_node));
3008 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
3009 #if HOST_BITS_PER_WIDE_INT >= 64
3010 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intTI_type_node));
3012 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node));
3013 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intHI_type_node));
3014 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intSI_type_node));
3015 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node));
3016 #if HOST_BITS_PER_WIDE_INT >= 64
3017 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intTI_type_node));
3020 /* `unsigned long' is the standard type for sizeof.
3021 Traditionally, use a signed type.
3022 Note that stddef.h uses `unsigned long',
3023 and this must agree, even if long and int are the same size. */
3024 t = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE)));
3025 signed_size_type_node = signed_type (t);
3026 if (flag_traditional && TREE_UNSIGNED (t))
3027 t = signed_type (t);
3029 c_size_type_node = t;
3032 /* Create the widest literal types. */
3033 widest_integer_literal_type_node
3034 = make_signed_type (HOST_BITS_PER_WIDE_INT * 2);
3035 widest_unsigned_literal_type_node
3036 = make_unsigned_type (HOST_BITS_PER_WIDE_INT * 2);
3037 pushdecl (build_decl (TYPE_DECL, NULL_TREE,
3038 widest_integer_literal_type_node));
3039 pushdecl (build_decl (TYPE_DECL, NULL_TREE,
3040 widest_unsigned_literal_type_node));
3042 build_common_tree_nodes_2 (flag_short_double);
3044 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_FLOAT],
3046 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_DOUBLE],
3048 pushdecl (build_decl (TYPE_DECL, get_identifier ("long double"),
3049 long_double_type_node));
3050 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex int"),
3051 complex_integer_type_node));
3052 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex float"),
3053 complex_float_type_node));
3054 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex double"),
3055 complex_double_type_node));
3056 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex long double"),
3057 complex_long_double_type_node));
3058 pushdecl (build_decl (TYPE_DECL,
3059 ridpointers[(int) RID_VOID], void_type_node));
3061 #ifdef MD_INIT_BUILTINS
3065 wchar_type_node = get_identifier (flag_short_wchar
3066 ? "short unsigned int"
3068 wchar_type_node = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (wchar_type_node));
3069 wchar_type_size = TYPE_PRECISION (wchar_type_node);
3070 signed_wchar_type_node = signed_type (wchar_type_node);
3071 unsigned_wchar_type_node = unsigned_type (wchar_type_node);
3073 boolean_type_node = integer_type_node;
3074 boolean_true_node = integer_one_node;
3075 boolean_false_node = integer_zero_node;
3077 /* With GCC, C99's _Bool is always of size 1. */
3078 c_bool_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
3079 TREE_SET_CODE (c_bool_type_node, BOOLEAN_TYPE);
3080 TYPE_MAX_VALUE (c_bool_type_node) = build_int_2 (1, 0);
3081 TREE_TYPE (TYPE_MAX_VALUE (c_bool_type_node)) = c_bool_type_node;
3082 TYPE_PRECISION (c_bool_type_node) = 1;
3083 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
3085 c_bool_false_node = build_int_2 (0, 0);
3086 TREE_TYPE (c_bool_false_node) = c_bool_type_node;
3087 c_bool_true_node = build_int_2 (1, 0);
3088 TREE_TYPE (c_bool_true_node) = c_bool_type_node;
3090 /* Make a type to be the domain of a few array types
3091 whose domains don't really matter.
3092 200 is small enough that it always fits in size_t
3093 and large enough that it can hold most function names for the
3094 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
3095 array_domain_type = build_index_type (build_int_2 (200, 0));
3097 /* make a type for arrays of characters.
3098 With luck nothing will ever really depend on the length of this
3100 char_array_type_node = build_array_type (char_type_node, array_domain_type);
3102 /* Likewise for arrays of ints. */
3104 = build_array_type (integer_type_node, array_domain_type);
3106 /* This is for wide string constants. */
3107 wchar_array_type_node
3108 = build_array_type (wchar_type_node, array_domain_type);
3110 void_list_node = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
3112 c_common_nodes_and_builtins ();
3114 endlink = void_list_node;
3115 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
3117 = build_function_type (ptr_type_node,
3118 tree_cons (NULL_TREE, ptr_type_node, endlink));
3120 /* Types which are common to the fortran compiler and libf2c. When
3121 changing these, you also need to be concerned with f/com.h. */
3123 if (TYPE_PRECISION (float_type_node)
3124 == TYPE_PRECISION (long_integer_type_node))
3126 g77_integer_type_node = long_integer_type_node;
3127 g77_uinteger_type_node = long_unsigned_type_node;
3129 else if (TYPE_PRECISION (float_type_node)
3130 == TYPE_PRECISION (integer_type_node))
3132 g77_integer_type_node = integer_type_node;
3133 g77_uinteger_type_node = unsigned_type_node;
3136 g77_integer_type_node = g77_uinteger_type_node = NULL_TREE;
3138 if (g77_integer_type_node != NULL_TREE)
3140 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_integer"),
3141 g77_integer_type_node));
3142 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_uinteger"),
3143 g77_uinteger_type_node));
3146 if (TYPE_PRECISION (float_type_node) * 2
3147 == TYPE_PRECISION (long_integer_type_node))
3149 g77_longint_type_node = long_integer_type_node;
3150 g77_ulongint_type_node = long_unsigned_type_node;
3152 else if (TYPE_PRECISION (float_type_node) * 2
3153 == TYPE_PRECISION (long_long_integer_type_node))
3155 g77_longint_type_node = long_long_integer_type_node;
3156 g77_ulongint_type_node = long_long_unsigned_type_node;
3159 g77_longint_type_node = g77_ulongint_type_node = NULL_TREE;
3161 if (g77_longint_type_node != NULL_TREE)
3163 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_longint"),
3164 g77_longint_type_node));
3165 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_ulongint"),
3166 g77_ulongint_type_node));
3169 builtin_function ("__builtin_aggregate_incoming_address",
3170 build_function_type (ptr_type_node, NULL_TREE),
3171 BUILT_IN_AGGREGATE_INCOMING_ADDRESS,
3172 BUILT_IN_NORMAL, NULL_PTR);
3174 /* Hooks for the DWARF 2 __throw routine. */
3175 builtin_function ("__builtin_unwind_init",
3176 build_function_type (void_type_node, endlink),
3177 BUILT_IN_UNWIND_INIT, BUILT_IN_NORMAL, NULL_PTR);
3178 builtin_function ("__builtin_dwarf_cfa", ptr_ftype_void,
3179 BUILT_IN_DWARF_CFA, BUILT_IN_NORMAL, NULL_PTR);
3180 builtin_function ("__builtin_dwarf_fp_regnum",
3181 build_function_type (unsigned_type_node, endlink),
3182 BUILT_IN_DWARF_FP_REGNUM, BUILT_IN_NORMAL, NULL_PTR);
3183 builtin_function ("__builtin_init_dwarf_reg_size_table", void_ftype_ptr,
3184 BUILT_IN_INIT_DWARF_REG_SIZES, BUILT_IN_NORMAL, NULL_PTR);
3185 builtin_function ("__builtin_frob_return_addr", ptr_ftype_ptr,
3186 BUILT_IN_FROB_RETURN_ADDR, BUILT_IN_NORMAL, NULL_PTR);
3187 builtin_function ("__builtin_extract_return_addr", ptr_ftype_ptr,
3188 BUILT_IN_EXTRACT_RETURN_ADDR, BUILT_IN_NORMAL, NULL_PTR);
3190 ("__builtin_eh_return",
3191 build_function_type (void_type_node,
3192 tree_cons (NULL_TREE, ptr_type_node,
3193 tree_cons (NULL_TREE,
3194 type_for_mode (ptr_mode, 0),
3195 tree_cons (NULL_TREE,
3198 BUILT_IN_EH_RETURN, BUILT_IN_NORMAL, NULL_PTR);
3200 pedantic_lvalues = pedantic;
3202 /* Create the global bindings for __FUNCTION__, __PRETTY_FUNCTION__,
3204 function_id_node = get_identifier ("__FUNCTION__");
3205 pretty_function_id_node = get_identifier ("__PRETTY_FUNCTION__");
3206 func_id_node = get_identifier ("__func__");
3207 make_fname_decl = c_make_fname_decl;
3208 declare_function_name ();
3210 start_identifier_warnings ();
3212 /* Prepare to check format strings against argument lists. */
3213 init_function_format_info ();
3215 incomplete_decl_finalize_hook = finish_incomplete_decl;
3217 /* Record our roots. */
3219 ggc_add_tree_root (c_global_trees, CTI_MAX);
3220 ggc_add_root (&c_stmt_tree, 1, sizeof c_stmt_tree, mark_stmt_tree);
3221 ggc_add_tree_root (&c_scope_stmt_stack, 1);
3222 ggc_add_tree_root (&named_labels, 1);
3223 ggc_add_tree_root (&shadowed_labels, 1);
3224 ggc_add_root (¤t_binding_level, 1, sizeof current_binding_level,
3225 mark_binding_level);
3226 ggc_add_root (&label_level_chain, 1, sizeof label_level_chain,
3227 mark_binding_level);
3228 ggc_add_tree_root (&static_ctors, 1);
3229 ggc_add_tree_root (&static_dtors, 1);
3232 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3233 decl, NAME is the initialization string and TYPE_DEP indicates whether
3234 NAME depended on the type of the function. As we don't yet implement
3235 delayed emission of static data, we mark the decl as emitted
3236 so it is not placed in the output. Anything using it must therefore pull
3237 out the STRING_CST initializer directly. This does mean that these names
3238 are string merging candidates, which is wrong for C99's __func__. FIXME. */
3241 c_make_fname_decl (id, name, type_dep)
3244 int type_dep ATTRIBUTE_UNUSED;
3246 tree decl, type, init;
3247 size_t length = strlen (name);
3249 type = build_array_type
3250 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
3251 build_index_type (build_int_2 (length, 0)));
3253 decl = build_decl (VAR_DECL, id, type);
3254 TREE_STATIC (decl) = 1;
3255 TREE_READONLY (decl) = 1;
3256 TREE_ASM_WRITTEN (decl) = 1;
3257 DECL_SOURCE_LINE (decl) = 0;
3258 DECL_ARTIFICIAL (decl) = 1;
3259 DECL_IN_SYSTEM_HEADER (decl) = 1;
3260 DECL_IGNORED_P (decl) = 1;
3261 init = build_string (length + 1, name);
3262 TREE_TYPE (init) = type;
3263 DECL_INITIAL (decl) = init;
3264 finish_decl (pushdecl (decl), init, NULL_TREE);
3269 /* Return a definition for a builtin function named NAME and whose data type
3270 is TYPE. TYPE should be a function type with argument types.
3271 FUNCTION_CODE tells later passes how to compile calls to this function.
3272 See tree.h for its possible values.
3274 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3275 the name to be called if we can't opencode the function. */
3278 builtin_function (name, type, function_code, class, library_name)
3282 enum built_in_class class;
3283 const char *library_name;
3285 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3286 DECL_EXTERNAL (decl) = 1;
3287 TREE_PUBLIC (decl) = 1;
3288 /* If -traditional, permit redefining a builtin function any way you like.
3289 (Though really, if the program redefines these functions,
3290 it probably won't work right unless compiled with -fno-builtin.) */
3291 if (flag_traditional && name[0] != '_')
3292 DECL_BUILT_IN_NONANSI (decl) = 1;
3294 DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
3295 make_decl_rtl (decl, NULL_PTR, 1);
3297 DECL_BUILT_IN_CLASS (decl) = class;
3298 DECL_FUNCTION_CODE (decl) = function_code;
3300 /* Warn if a function in the namespace for users
3301 is used without an occasion to consider it declared. */
3302 if (name[0] != '_' || name[1] != '_')
3303 C_DECL_ANTICIPATED (decl) = 1;
3308 /* Called when a declaration is seen that contains no names to declare.
3309 If its type is a reference to a structure, union or enum inherited
3310 from a containing scope, shadow that tag name for the current scope
3311 with a forward reference.
3312 If its type defines a new named structure or union
3313 or defines an enum, it is valid but we need not do anything here.
3314 Otherwise, it is an error. */
3317 shadow_tag (declspecs)
3320 shadow_tag_warned (declspecs, 0);
3324 shadow_tag_warned (declspecs, warned)
3327 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3334 pending_invalid_xref = 0;
3336 /* Remove the attributes from declspecs, since they will confuse the
3338 split_specs_attrs (declspecs, &specs, &attrs);
3340 for (link = specs; link; link = TREE_CHAIN (link))
3342 register tree value = TREE_VALUE (link);
3343 register enum tree_code code = TREE_CODE (value);
3345 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3346 /* Used to test also that TYPE_SIZE (value) != 0.
3347 That caused warning for `struct foo;' at top level in the file. */
3349 register tree name = lookup_tag_reverse (value);
3356 if (warned != 1 && code != ENUMERAL_TYPE)
3357 /* Empty unnamed enum OK */
3359 pedwarn ("unnamed struct/union that defines no instances");
3365 t = lookup_tag (code, name, current_binding_level, 1);
3369 t = make_node (code);
3376 if (!warned && ! in_system_header)
3378 warning ("useless keyword or type name in empty declaration");
3385 error ("two types specified in one empty declaration");
3390 pedwarn ("empty declaration");
3394 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3397 groktypename (typename)
3400 if (TREE_CODE (typename) != TREE_LIST)
3402 return grokdeclarator (TREE_VALUE (typename),
3403 TREE_PURPOSE (typename),
3407 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3410 groktypename_in_parm_context (typename)
3413 if (TREE_CODE (typename) != TREE_LIST)
3415 return grokdeclarator (TREE_VALUE (typename),
3416 TREE_PURPOSE (typename),
3420 /* Decode a declarator in an ordinary declaration or data definition.
3421 This is called as soon as the type information and variable name
3422 have been parsed, before parsing the initializer if any.
3423 Here we create the ..._DECL node, fill in its type,
3424 and put it on the list of decls for the current context.
3425 The ..._DECL node is returned as the value.
3427 Exception: for arrays where the length is not specified,
3428 the type is left null, to be filled in by `finish_decl'.
3430 Function definitions do not come here; they go to start_function
3431 instead. However, external and forward declarations of functions
3432 do go through here. Structure field declarations are done by
3433 grokfield and not through here. */
3436 start_decl (declarator, declspecs, initialized, attributes, prefix_attributes)
3437 tree declarator, declspecs;
3439 tree attributes, prefix_attributes;
3441 register tree decl = grokdeclarator (declarator, declspecs,
3442 NORMAL, initialized);
3445 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3446 && MAIN_NAME_P (DECL_NAME (decl)))
3447 warning_with_decl (decl, "`%s' is usually a function");
3450 /* Is it valid for this decl to have an initializer at all?
3451 If not, set INITIALIZED to zero, which will indirectly
3452 tell `finish_decl' to ignore the initializer once it is parsed. */
3453 switch (TREE_CODE (decl))
3456 /* typedef foo = bar means give foo the same type as bar.
3457 We haven't parsed bar yet, so `finish_decl' will fix that up.
3458 Any other case of an initialization in a TYPE_DECL is an error. */
3459 if (pedantic || list_length (declspecs) > 1)
3461 error ("typedef `%s' is initialized",
3462 IDENTIFIER_POINTER (DECL_NAME (decl)));
3468 error ("function `%s' is initialized like a variable",
3469 IDENTIFIER_POINTER (DECL_NAME (decl)));
3474 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3475 error ("parameter `%s' is initialized",
3476 IDENTIFIER_POINTER (DECL_NAME (decl)));
3481 /* Don't allow initializations for incomplete types
3482 except for arrays which might be completed by the initialization. */
3484 /* This can happen if the array size is an undefined macro. We already
3485 gave a warning, so we don't need another one. */
3486 if (TREE_TYPE (decl) == error_mark_node)
3488 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3490 /* A complete type is ok if size is fixed. */
3492 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3493 || C_DECL_VARIABLE_SIZE (decl))
3495 error ("variable-sized object may not be initialized");
3499 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3501 error ("variable `%s' has initializer but incomplete type",
3502 IDENTIFIER_POINTER (DECL_NAME (decl)));
3505 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
3507 error ("elements of array `%s' have incomplete type",
3508 IDENTIFIER_POINTER (DECL_NAME (decl)));
3516 /* Seems redundant with grokdeclarator. */
3517 if (current_binding_level != global_binding_level
3518 && DECL_EXTERNAL (decl)
3519 && TREE_CODE (decl) != FUNCTION_DECL)
3520 warning ("declaration of `%s' has `extern' and is initialized",
3521 IDENTIFIER_POINTER (DECL_NAME (decl)));
3523 DECL_EXTERNAL (decl) = 0;
3524 if (current_binding_level == global_binding_level)
3525 TREE_STATIC (decl) = 1;
3527 /* Tell `pushdecl' this is an initialized decl
3528 even though we don't yet have the initializer expression.
3529 Also tell `finish_decl' it may store the real initializer. */
3530 DECL_INITIAL (decl) = error_mark_node;
3533 /* If this is a function declaration, write a record describing it to the
3534 prototypes file (if requested). */
3536 if (TREE_CODE (decl) == FUNCTION_DECL)
3537 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3539 /* ANSI specifies that a tentative definition which is not merged with
3540 a non-tentative definition behaves exactly like a definition with an
3541 initializer equal to zero. (Section 3.7.2)
3542 -fno-common gives strict ANSI behavior. Usually you don't want it.
3543 This matters only for variables with external linkage. */
3544 if (! flag_no_common || ! TREE_PUBLIC (decl))
3545 DECL_COMMON (decl) = 1;
3547 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
3548 SET_DEFAULT_DECL_ATTRIBUTES (decl, attributes);
3551 /* Set attributes here so if duplicate decl, will have proper attributes. */
3552 decl_attributes (decl, attributes, prefix_attributes);
3554 /* Add this decl to the current binding level.
3555 TEM may equal DECL or it may be a previous decl of the same name. */
3556 tem = pushdecl (decl);
3558 /* For a local variable, define the RTL now. */
3559 if (current_binding_level != global_binding_level
3560 /* But not if this is a duplicate decl
3561 and we preserved the rtl from the previous one
3562 (which may or may not happen). */
3563 && DECL_RTL (tem) == 0
3564 && !DECL_CONTEXT (tem))
3566 if (TREE_TYPE (tem) != error_mark_node
3567 && COMPLETE_TYPE_P (TREE_TYPE (tem)))
3569 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3570 && DECL_INITIAL (tem) != 0)
3577 /* Finish processing of a declaration;
3578 install its initial value.
3579 If the length of an array type is not known before,
3580 it must be determined now, from the initial value, or it is an error. */
3583 finish_decl (decl, init, asmspec_tree)
3587 register tree type = TREE_TYPE (decl);
3588 int was_incomplete = (DECL_SIZE (decl) == 0);
3589 const char *asmspec = 0;
3591 /* If a name was specified, get the string. */
3593 asmspec = TREE_STRING_POINTER (asmspec_tree);
3595 /* If `start_decl' didn't like having an initialization, ignore it now. */
3597 if (init != 0 && DECL_INITIAL (decl) == 0)
3599 /* Don't crash if parm is initialized. */
3600 if (TREE_CODE (decl) == PARM_DECL)
3605 if (TREE_CODE (decl) != TYPE_DECL)
3606 store_init_value (decl, init);
3609 /* typedef foo = bar; store the type of bar as the type of foo. */
3610 TREE_TYPE (decl) = TREE_TYPE (init);
3611 DECL_INITIAL (decl) = init = 0;
3615 /* Deduce size of array from initialization, if not already known */
3617 if (TREE_CODE (type) == ARRAY_TYPE
3618 && TYPE_DOMAIN (type) == 0
3619 && TREE_CODE (decl) != TYPE_DECL)
3622 = (TREE_STATIC (decl)
3623 /* Even if pedantic, an external linkage array
3624 may have incomplete type at first. */
3625 ? pedantic && !TREE_PUBLIC (decl)
3626 : !DECL_EXTERNAL (decl));
3628 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3630 /* Get the completed type made by complete_array_type. */
3631 type = TREE_TYPE (decl);
3634 error_with_decl (decl, "initializer fails to determine size of `%s'");
3636 else if (failure == 2)
3639 error_with_decl (decl, "array size missing in `%s'");
3640 /* If a `static' var's size isn't known,
3641 make it extern as well as static, so it does not get
3643 If it is not `static', then do not mark extern;
3644 finish_incomplete_decl will give it a default size
3645 and it will get allocated. */
3646 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3647 DECL_EXTERNAL (decl) = 1;
3650 /* TYPE_MAX_VALUE is always one less than the number of elements
3651 in the array, because we start counting at zero. Therefore,
3652 warn only if the value is less than zero. */
3653 else if (pedantic && TYPE_DOMAIN (type) != 0
3654 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3655 error_with_decl (decl, "zero or negative size array `%s'");
3657 layout_decl (decl, 0);
3660 if (TREE_CODE (decl) == VAR_DECL)
3662 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
3663 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3664 layout_decl (decl, 0);
3666 if (DECL_SIZE (decl) == 0
3667 /* Don't give an error if we already gave one earlier. */
3668 && TREE_TYPE (decl) != error_mark_node
3669 && (TREE_STATIC (decl)
3671 /* A static variable with an incomplete type
3672 is an error if it is initialized.
3673 Also if it is not file scope.
3674 Otherwise, let it through, but if it is not `extern'
3675 then it may cause an error message later. */
3676 (DECL_INITIAL (decl) != 0
3677 || DECL_CONTEXT (decl) != 0)
3679 /* An automatic variable with an incomplete type
3681 !DECL_EXTERNAL (decl)))
3683 error_with_decl (decl, "storage size of `%s' isn't known");
3684 TREE_TYPE (decl) = error_mark_node;
3687 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3688 && DECL_SIZE (decl) != 0)
3690 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3691 constant_expression_warning (DECL_SIZE (decl));
3693 error_with_decl (decl, "storage size of `%s' isn't constant");
3696 if (TREE_USED (type))
3697 TREE_USED (decl) = 1;
3700 /* If this is a function and an assembler name is specified, it isn't
3701 builtin any more. Also reset DECL_RTL so we can give it its new
3703 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3705 DECL_BUILT_IN_CLASS (decl) = NOT_BUILT_IN;
3706 DECL_RTL (decl) = 0;
3707 DECL_ASSEMBLER_NAME (decl) = get_identifier (asmspec);
3710 /* Output the assembler code and/or RTL code for variables and functions,
3711 unless the type is an undefined structure or union.
3712 If not, it will get done when the type is completed. */
3714 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3716 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3717 maybe_objc_check_decl (decl);
3719 if (!DECL_CONTEXT (decl))
3720 rest_of_decl_compilation (decl, asmspec,
3721 (DECL_CONTEXT (decl) == 0
3722 || TREE_ASM_WRITTEN (decl)), 0);
3727 DECL_ASSEMBLER_NAME (decl) = get_identifier (asmspec);
3728 DECL_C_HARD_REGISTER (decl) = 1;
3730 add_decl_stmt (decl);
3733 if (DECL_CONTEXT (decl) != 0)
3735 /* Recompute the RTL of a local array now
3736 if it used to be an incomplete type. */
3738 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3740 /* If we used it already as memory, it must stay in memory. */
3741 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3742 /* If it's still incomplete now, no init will save it. */
3743 if (DECL_SIZE (decl) == 0)
3744 DECL_INITIAL (decl) = 0;
3749 if (TREE_CODE (decl) == TYPE_DECL)
3751 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3752 maybe_objc_check_decl (decl);
3753 rest_of_decl_compilation (decl, NULL_PTR, DECL_CONTEXT (decl) == 0, 0);
3756 /* At the end of a declaration, throw away any variable type sizes
3757 of types defined inside that declaration. There is no use
3758 computing them in the following function definition. */
3759 if (current_binding_level == global_binding_level)
3760 get_pending_sizes ();
3763 /* If DECL has a cleanup, build and return that cleanup here.
3764 This is a callback called by expand_expr. */
3767 maybe_build_cleanup (decl)
3768 tree decl ATTRIBUTE_UNUSED;
3770 /* There are no cleanups in C. */
3774 /* Given a parsed parameter declaration,
3775 decode it into a PARM_DECL and push that on the current binding level.
3776 Also, for the sake of forward parm decls,
3777 record the given order of parms in `parm_order'. */
3780 push_parm_decl (parm)
3784 int old_immediate_size_expand = immediate_size_expand;
3785 /* Don't try computing parm sizes now -- wait till fn is called. */
3786 immediate_size_expand = 0;
3788 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3789 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3790 decl_attributes (decl, TREE_VALUE (TREE_VALUE (parm)),
3791 TREE_PURPOSE (TREE_VALUE (parm)));
3794 if (DECL_NAME (decl))
3797 olddecl = lookup_name (DECL_NAME (decl));
3798 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3799 pedwarn_with_decl (decl,
3800 "ANSI C forbids parameter `%s' shadowing typedef");
3804 decl = pushdecl (decl);
3806 immediate_size_expand = old_immediate_size_expand;
3808 current_binding_level->parm_order
3809 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3811 /* Add this decl to the current binding level. */
3812 finish_decl (decl, NULL_TREE, NULL_TREE);
3815 /* Clear the given order of parms in `parm_order'.
3816 Used at start of parm list,
3817 and also at semicolon terminating forward decls. */
3822 current_binding_level->parm_order = NULL_TREE;
3825 /* Make TYPE a complete type based on INITIAL_VALUE.
3826 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3827 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3830 complete_array_type (type, initial_value, do_default)
3835 register tree maxindex = NULL_TREE;
3840 /* Note MAXINDEX is really the maximum index,
3841 one less than the size. */
3842 if (TREE_CODE (initial_value) == STRING_CST)
3845 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3846 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3849 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3851 tree elts = CONSTRUCTOR_ELTS (initial_value);
3852 maxindex = build_int_2 (-1, -1);
3853 for (; elts; elts = TREE_CHAIN (elts))
3855 if (TREE_PURPOSE (elts))
3856 maxindex = TREE_PURPOSE (elts);
3858 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3859 maxindex, integer_one_node));
3861 maxindex = copy_node (maxindex);
3865 /* Make an error message unless that happened already. */
3866 if (initial_value != error_mark_node)
3869 /* Prevent further error messages. */
3870 maxindex = build_int_2 (0, 0);
3877 maxindex = build_int_2 (0, 0);
3883 TYPE_DOMAIN (type) = build_index_type (maxindex);
3884 if (!TREE_TYPE (maxindex))
3885 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3888 /* Lay out the type now that we can get the real answer. */
3895 /* Given declspecs and a declarator,
3896 determine the name and type of the object declared
3897 and construct a ..._DECL node for it.
3898 (In one case we can return a ..._TYPE node instead.
3899 For invalid input we sometimes return 0.)
3901 DECLSPECS is a chain of tree_list nodes whose value fields
3902 are the storage classes and type specifiers.
3904 DECL_CONTEXT says which syntactic context this declaration is in:
3905 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3906 FUNCDEF for a function definition. Like NORMAL but a few different
3907 error messages in each case. Return value may be zero meaning
3908 this definition is too screwy to try to parse.
3909 PARM for a parameter declaration (either within a function prototype
3910 or before a function body). Make a PARM_DECL, or return void_type_node.
3911 TYPENAME if for a typename (in a cast or sizeof).
3912 Don't make a DECL node; just return the ..._TYPE node.
3913 FIELD for a struct or union field; make a FIELD_DECL.
3914 BITFIELD for a field with specified width.
3915 INITIALIZED is 1 if the decl has an initializer.
3917 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3918 It may also be so in the PARM case, for a prototype where the
3919 argument type is specified but not the name.
3921 This function is where the complicated C meanings of `static'
3922 and `extern' are interpreted. */
3925 grokdeclarator (declarator, declspecs, decl_context, initialized)
3928 enum decl_context decl_context;
3933 tree type = NULL_TREE;
3938 int type_quals = TYPE_UNQUALIFIED;
3940 int explicit_int = 0;
3941 int explicit_char = 0;
3942 int defaulted_int = 0;
3943 tree typedef_decl = 0;
3945 tree typedef_type = 0;
3946 int funcdef_flag = 0;
3947 enum tree_code innermost_code = ERROR_MARK;
3949 int size_varies = 0;
3950 tree decl_machine_attr = NULL_TREE;
3952 if (decl_context == BITFIELD)
3953 bitfield = 1, decl_context = FIELD;
3955 if (decl_context == FUNCDEF)
3956 funcdef_flag = 1, decl_context = NORMAL;
3958 /* Look inside a declarator for the name being declared
3959 and get it as a string, for an error message. */
3961 register tree decl = declarator;
3965 switch (TREE_CODE (decl))
3970 innermost_code = TREE_CODE (decl);
3971 decl = TREE_OPERAND (decl, 0);
3974 case IDENTIFIER_NODE:
3975 name = IDENTIFIER_POINTER (decl);
3986 /* A function definition's declarator must have the form of
3987 a function declarator. */
3989 if (funcdef_flag && innermost_code != CALL_EXPR)
3992 /* Anything declared one level down from the top level
3993 must be one of the parameters of a function
3994 (because the body is at least two levels down). */
3996 /* If this looks like a function definition, make it one,
3997 even if it occurs where parms are expected.
3998 Then store_parm_decls will reject it and not use it as a parm. */
3999 if (decl_context == NORMAL && !funcdef_flag
4000 && current_binding_level->parm_flag)
4001 decl_context = PARM;
4003 /* Look through the decl specs and record which ones appear.
4004 Some typespecs are defined as built-in typenames.
4005 Others, the ones that are modifiers of other types,
4006 are represented by bits in SPECBITS: set the bits for
4007 the modifiers that appear. Storage class keywords are also in SPECBITS.
4009 If there is a typedef name or a type, store the type in TYPE.
4010 This includes builtin typedefs such as `int'.
4012 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
4013 and did not come from a user typedef.
4015 Set LONGLONG if `long' is mentioned twice. */
4017 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
4019 register tree id = TREE_VALUE (spec);
4021 if (id == ridpointers[(int) RID_INT])
4023 if (id == ridpointers[(int) RID_CHAR])
4026 if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
4028 enum rid i = C_RID_CODE (id);
4029 if (i <= RID_LAST_MODIFIER)
4031 if (i == RID_LONG && specbits & (1<<i))
4034 error ("`long long long' is too long for GCC");
4037 if (pedantic && !flag_isoc99 && ! in_system_header
4039 pedwarn ("ISO C89 does not support `long long'");
4043 else if (specbits & (1 << i))
4044 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
4050 error ("two or more data types in declaration of `%s'", name);
4051 /* Actual typedefs come to us as TYPE_DECL nodes. */
4052 else if (TREE_CODE (id) == TYPE_DECL)
4054 type = TREE_TYPE (id);
4055 decl_machine_attr = DECL_MACHINE_ATTRIBUTES (id);
4058 /* Built-in types come as identifiers. */
4059 else if (TREE_CODE (id) == IDENTIFIER_NODE)
4061 register tree t = lookup_name (id);
4062 if (TREE_TYPE (t) == error_mark_node)
4064 else if (!t || TREE_CODE (t) != TYPE_DECL)
4065 error ("`%s' fails to be a typedef or built in type",
4066 IDENTIFIER_POINTER (id));
4069 type = TREE_TYPE (t);
4073 else if (TREE_CODE (id) != ERROR_MARK)
4080 typedef_type = type;
4082 size_varies = C_TYPE_VARIABLE_SIZE (type);
4084 /* No type at all: default to `int', and set DEFAULTED_INT
4085 because it was not a user-defined typedef. */
4089 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4090 | (1 << (int) RID_SIGNED)
4091 | (1 << (int) RID_UNSIGNED)
4092 | (1 << (int) RID_COMPLEX))))
4093 /* Don't warn about typedef foo = bar. */
4094 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
4095 && ! in_system_header)
4097 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
4098 and this is a function, or if -Wimplicit; prefer the former
4099 warning since it is more explicit. */
4100 if ((warn_implicit_int || warn_return_type) && funcdef_flag)
4101 warn_about_return_type = 1;
4102 else if (warn_implicit_int || flag_isoc99)
4103 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
4108 type = integer_type_node;
4111 /* Now process the modifiers that were specified
4112 and check for invalid combinations. */
4114 /* Long double is a special combination. */
4116 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4117 && TYPE_MAIN_VARIANT (type) == double_type_node)
4119 specbits &= ~(1 << (int) RID_LONG);
4120 type = long_double_type_node;
4123 /* Check all other uses of type modifiers. */
4125 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4126 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4130 if ((specbits & 1 << (int) RID_LONG)
4131 && (specbits & 1 << (int) RID_SHORT))
4132 error ("both long and short specified for `%s'", name);
4133 else if (((specbits & 1 << (int) RID_LONG)
4134 || (specbits & 1 << (int) RID_SHORT))
4136 error ("long or short specified with char for `%s'", name);
4137 else if (((specbits & 1 << (int) RID_LONG)
4138 || (specbits & 1 << (int) RID_SHORT))
4139 && TREE_CODE (type) == REAL_TYPE)
4141 static int already = 0;
4143 error ("long or short specified with floating type for `%s'", name);
4144 if (! already && ! pedantic)
4146 error ("the only valid combination is `long double'");
4150 else if ((specbits & 1 << (int) RID_SIGNED)
4151 && (specbits & 1 << (int) RID_UNSIGNED))
4152 error ("both signed and unsigned specified for `%s'", name);
4153 else if (TREE_CODE (type) != INTEGER_TYPE)
4154 error ("long, short, signed or unsigned invalid for `%s'", name);
4158 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4160 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4162 if (flag_pedantic_errors)
4167 /* Discard the type modifiers if they are invalid. */
4170 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4171 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4176 if ((specbits & (1 << (int) RID_COMPLEX))
4177 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4179 error ("complex invalid for `%s'", name);
4180 specbits &= ~(1 << (int) RID_COMPLEX);
4183 /* Decide whether an integer type is signed or not.
4184 Optionally treat bitfields as signed by default. */
4185 if (specbits & 1 << (int) RID_UNSIGNED
4186 /* Traditionally, all bitfields are unsigned. */
4187 || (bitfield && flag_traditional
4188 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4189 || (bitfield && ! flag_signed_bitfields
4190 && (explicit_int || defaulted_int || explicit_char
4191 /* A typedef for plain `int' without `signed'
4192 can be controlled just like plain `int'. */
4193 || ! (typedef_decl != 0
4194 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4195 && TREE_CODE (type) != ENUMERAL_TYPE
4196 && !(specbits & 1 << (int) RID_SIGNED)))
4199 type = long_long_unsigned_type_node;
4200 else if (specbits & 1 << (int) RID_LONG)
4201 type = long_unsigned_type_node;
4202 else if (specbits & 1 << (int) RID_SHORT)
4203 type = short_unsigned_type_node;
4204 else if (type == char_type_node)
4205 type = unsigned_char_type_node;
4206 else if (typedef_decl)
4207 type = unsigned_type (type);
4209 type = unsigned_type_node;
4211 else if ((specbits & 1 << (int) RID_SIGNED)
4212 && type == char_type_node)
4213 type = signed_char_type_node;
4215 type = long_long_integer_type_node;
4216 else if (specbits & 1 << (int) RID_LONG)
4217 type = long_integer_type_node;
4218 else if (specbits & 1 << (int) RID_SHORT)
4219 type = short_integer_type_node;
4221 if (specbits & 1 << (int) RID_COMPLEX)
4223 if (pedantic && !flag_isoc99)
4224 pedwarn ("ISO C89 does not support complex types");
4225 /* If we just have "complex", it is equivalent to
4226 "complex double", but if any modifiers at all are specified it is
4227 the complex form of TYPE. E.g, "complex short" is
4228 "complex short int". */
4230 if (defaulted_int && ! longlong
4231 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4232 | (1 << (int) RID_SIGNED)
4233 | (1 << (int) RID_UNSIGNED))))
4236 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
4237 type = complex_double_type_node;
4239 else if (type == integer_type_node)
4242 pedwarn ("ISO C does not support complex integer types");
4243 type = complex_integer_type_node;
4245 else if (type == float_type_node)
4246 type = complex_float_type_node;
4247 else if (type == double_type_node)
4248 type = complex_double_type_node;
4249 else if (type == long_double_type_node)
4250 type = complex_long_double_type_node;
4254 pedwarn ("ISO C does not support complex integer types");
4255 type = build_complex_type (type);
4259 /* Figure out the type qualifiers for the declaration. There are
4260 two ways a declaration can become qualified. One is something
4261 like `const int i' where the `const' is explicit. Another is
4262 something like `typedef const int CI; CI i' where the type of the
4263 declaration contains the `const'. */
4264 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4265 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
4266 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4267 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4268 if (constp > 1 && ! flag_isoc99)
4269 pedwarn ("duplicate `const'");
4270 if (restrictp > 1 && ! flag_isoc99)
4271 pedwarn ("duplicate `restrict'");
4272 if (volatilep > 1 && ! flag_isoc99)
4273 pedwarn ("duplicate `volatile'");
4274 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
4275 type = TYPE_MAIN_VARIANT (type);
4276 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4277 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4278 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4280 /* Warn if two storage classes are given. Default to `auto'. */
4285 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4286 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4287 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4288 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4289 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4291 /* Warn about storage classes that are invalid for certain
4292 kinds of declarations (parameters, typenames, etc.). */
4295 error ("multiple storage classes in declaration of `%s'", name);
4296 else if (funcdef_flag
4298 & ((1 << (int) RID_REGISTER)
4299 | (1 << (int) RID_AUTO)
4300 | (1 << (int) RID_TYPEDEF))))
4302 if (specbits & 1 << (int) RID_AUTO
4303 && (pedantic || current_binding_level == global_binding_level))
4304 pedwarn ("function definition declared `auto'");
4305 if (specbits & 1 << (int) RID_REGISTER)
4306 error ("function definition declared `register'");
4307 if (specbits & 1 << (int) RID_TYPEDEF)
4308 error ("function definition declared `typedef'");
4309 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4310 | (1 << (int) RID_AUTO));
4312 else if (decl_context != NORMAL && nclasses > 0)
4314 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4318 switch (decl_context)
4321 error ("storage class specified for structure field `%s'",
4325 error ("storage class specified for parameter `%s'", name);
4328 error ("storage class specified for typename");
4331 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4332 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4333 | (1 << (int) RID_EXTERN));
4336 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4338 /* `extern' with initialization is invalid if not at top level. */
4339 if (current_binding_level == global_binding_level)
4340 warning ("`%s' initialized and declared `extern'", name);
4342 error ("`%s' has both `extern' and initializer", name);
4344 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4345 && current_binding_level != global_binding_level)
4346 error ("nested function `%s' declared `extern'", name);
4347 else if (current_binding_level == global_binding_level
4348 && specbits & (1 << (int) RID_AUTO))
4349 error ("top-level declaration of `%s' specifies `auto'", name);
4352 /* Now figure out the structure of the declarator proper.
4353 Descend through it, creating more complex types, until we reach
4354 the declared identifier (or NULL_TREE, in an absolute declarator). */
4356 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4358 if (type == error_mark_node)
4360 declarator = TREE_OPERAND (declarator, 0);
4364 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4365 an INDIRECT_REF (for *...),
4366 a CALL_EXPR (for ...(...)),
4367 an identifier (for the name being declared)
4368 or a null pointer (for the place in an absolute declarator
4369 where the name was omitted).
4370 For the last two cases, we have just exited the loop.
4372 At this point, TYPE is the type of elements of an array,
4373 or for a function to return, or for a pointer to point to.
4374 After this sequence of ifs, TYPE is the type of the
4375 array or function or pointer, and DECLARATOR has had its
4376 outermost layer removed. */
4378 if (TREE_CODE (declarator) == ARRAY_REF)
4380 register tree itype = NULL_TREE;
4381 register tree size = TREE_OPERAND (declarator, 1);
4382 /* The index is a signed object `sizetype' bits wide. */
4383 tree index_type = signed_type (sizetype);
4385 declarator = TREE_OPERAND (declarator, 0);
4387 /* Check for some types that there cannot be arrays of. */
4389 if (VOID_TYPE_P (type))
4391 error ("declaration of `%s' as array of voids", name);
4392 type = error_mark_node;
4395 if (TREE_CODE (type) == FUNCTION_TYPE)
4397 error ("declaration of `%s' as array of functions", name);
4398 type = error_mark_node;
4401 if (size == error_mark_node)
4402 type = error_mark_node;
4404 if (type == error_mark_node)
4407 /* If size was specified, set ITYPE to a range-type for that size.
4408 Otherwise, ITYPE remains null. finish_decl may figure it out
4409 from an initial value. */
4413 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4414 STRIP_TYPE_NOPS (size);
4416 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
4417 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
4419 error ("size of array `%s' has non-integer type", name);
4420 size = integer_one_node;
4423 if (pedantic && integer_zerop (size))
4424 pedwarn ("ISO C forbids zero-size array `%s'", name);
4426 if (TREE_CODE (size) == INTEGER_CST)
4428 constant_expression_warning (size);
4429 if (tree_int_cst_sgn (size) < 0)
4431 error ("size of array `%s' is negative", name);
4432 size = integer_one_node;
4437 /* Make sure the array size remains visibly nonconstant
4438 even if it is (eg) a const variable with known value. */
4443 if (TREE_CONSTANT (size))
4444 pedwarn ("ISO C89 forbids array `%s' whose size can't be evaluated",
4447 pedwarn ("ISO C89 forbids variable-size array `%s'",
4452 if (integer_zerop (size))
4454 /* A zero-length array cannot be represented with an
4455 unsigned index type, which is what we'll get with
4456 build_index_type. Create an open-ended range instead. */
4457 itype = build_range_type (sizetype, size, NULL_TREE);
4461 /* Compute the maximum valid index, that is, size - 1.
4462 Do the calculation in index_type, so that if it is
4463 a variable the computations will be done in the
4465 itype = fold (build (MINUS_EXPR, index_type,
4466 convert (index_type, size),
4467 convert (index_type, size_one_node)));
4469 /* If that overflowed, the array is too big.
4470 ??? While a size of INT_MAX+1 technically shouldn't
4471 cause an overflow (because we subtract 1), the overflow
4472 is recorded during the conversion to index_type, before
4473 the subtraction. Handling this case seems like an
4474 unnecessary complication. */
4475 if (TREE_OVERFLOW (itype))
4477 error ("size of array `%s' is too large", name);
4478 type = error_mark_node;
4483 itype = variable_size (itype);
4484 itype = build_index_type (itype);
4487 else if (decl_context == FIELD)
4489 /* ??? Need to check somewhere that this is a structure
4490 and not a union, that this field is last, and that
4491 this structure has at least one other named member. */
4493 if (pedantic && !flag_isoc99 && !in_system_header)
4494 pedwarn ("ISO C89 does not support flexible array members");
4496 /* ISO C99 Flexible array members are effectively identical
4497 to GCC's zero-length array extension. */
4498 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4501 /* If pedantic, complain about arrays of incomplete types. */
4503 if (pedantic && !COMPLETE_TYPE_P (type))
4504 pedwarn ("array type has incomplete element type");
4507 /* We shouldn't have a function type here at all!
4508 Functions aren't allowed as array elements. */
4509 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4510 && (constp || volatilep))
4511 pedwarn ("ANSI C forbids const or volatile function types");
4514 /* Build the array type itself, then merge any constancy or
4515 volatility into the target type. We must do it in this order
4516 to ensure that the TYPE_MAIN_VARIANT field of the array type
4517 is set correctly. */
4519 type = build_array_type (type, itype);
4521 type = c_build_qualified_type (type, type_quals);
4524 /* Don't clear these; leave them set so that the array type
4525 or the variable is itself const or volatile. */
4526 type_quals = TYPE_UNQUALIFIED;
4530 C_TYPE_VARIABLE_SIZE (type) = 1;
4532 else if (TREE_CODE (declarator) == CALL_EXPR)
4536 /* Declaring a function type.
4537 Make sure we have a valid type for the function to return. */
4538 if (type == error_mark_node)
4543 /* Warn about some types functions can't return. */
4545 if (TREE_CODE (type) == FUNCTION_TYPE)
4547 error ("`%s' declared as function returning a function", name);
4548 type = integer_type_node;
4550 if (TREE_CODE (type) == ARRAY_TYPE)
4552 error ("`%s' declared as function returning an array", name);
4553 type = integer_type_node;
4556 #ifndef TRADITIONAL_RETURN_FLOAT
4557 /* Traditionally, declaring return type float means double. */
4559 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4560 type = double_type_node;
4561 #endif /* TRADITIONAL_RETURN_FLOAT */
4563 /* Construct the function type and go to the next
4564 inner layer of declarator. */
4566 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4568 /* Say it's a definition
4569 only for the CALL_EXPR
4570 closest to the identifier. */
4571 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4572 /* Type qualifiers before the return type of the function
4573 qualify the return type, not the function type. */
4576 /* Type qualifiers on a function return type are normally
4577 permitted by the standard but have no effect, so give a
4578 warning at -W. Qualifiers on a void return type have
4579 meaning as a GNU extension, and are banned on function
4580 definitions in ISO C. FIXME: strictly we shouldn't
4581 pedwarn for qualified void return types except on function
4582 definitions, but not doing so could lead to the undesirable
4583 state of a "volatile void" function return type not being
4584 warned about, and a use of the function being compiled
4585 with GNU semantics, with no diagnostics under -pedantic. */
4586 if (VOID_TYPE_P (type) && pedantic && !in_system_header)
4587 pedwarn ("ISO C forbids qualified void function return type");
4588 else if (extra_warnings
4589 && !(VOID_TYPE_P (type)
4590 && type_quals == TYPE_QUAL_VOLATILE))
4591 warning ("type qualifiers ignored on function return type");
4593 type = c_build_qualified_type (type, type_quals);
4595 type_quals = TYPE_UNQUALIFIED;
4597 type = build_function_type (type, arg_types);
4598 declarator = TREE_OPERAND (declarator, 0);
4600 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4601 the formal parameter list of this FUNCTION_TYPE to point to
4602 the FUNCTION_TYPE node itself. */
4607 for (link = last_function_parm_tags;
4609 link = TREE_CHAIN (link))
4610 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4613 else if (TREE_CODE (declarator) == INDIRECT_REF)
4615 /* Merge any constancy or volatility into the target type
4618 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4620 pedwarn ("ISO C forbids qualified function types");
4622 type = c_build_qualified_type (type, type_quals);
4623 type_quals = TYPE_UNQUALIFIED;
4626 type = build_pointer_type (type);
4628 /* Process a list of type modifier keywords
4629 (such as const or volatile) that were given inside the `*'. */
4631 if (TREE_TYPE (declarator))
4633 register tree typemodlist;
4639 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4640 typemodlist = TREE_CHAIN (typemodlist))
4642 tree qualifier = TREE_VALUE (typemodlist);
4644 if (C_IS_RESERVED_WORD (qualifier))
4646 if (C_RID_CODE (qualifier) == RID_CONST)
4648 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4650 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4660 error ("invalid type modifier within pointer declarator");
4661 if (constp > 1 && ! flag_isoc99)
4662 pedwarn ("duplicate `const'");
4663 if (volatilep > 1 && ! flag_isoc99)
4664 pedwarn ("duplicate `volatile'");
4665 if (restrictp > 1 && ! flag_isoc99)
4666 pedwarn ("duplicate `restrict'");
4668 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4669 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4670 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4673 declarator = TREE_OPERAND (declarator, 0);
4680 /* Now TYPE has the actual type. */
4682 /* Did array size calculations overflow? */
4684 if (TREE_CODE (type) == ARRAY_TYPE
4685 && COMPLETE_TYPE_P (type)
4686 && TREE_OVERFLOW (TYPE_SIZE (type)))
4688 error ("size of array `%s' is too large", name);
4689 /* If we proceed with the array type as it is, we'll eventully
4690 crash in tree_low_cst(). */
4691 type = error_mark_node;
4694 /* If this is declaring a typedef name, return a TYPE_DECL. */
4696 if (specbits & (1 << (int) RID_TYPEDEF))
4699 /* Note that the grammar rejects storage classes
4700 in typenames, fields or parameters */
4701 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4703 pedwarn ("ISO C forbids qualified function types");
4705 type = c_build_qualified_type (type, type_quals);
4706 decl = build_decl (TYPE_DECL, declarator, type);
4707 if ((specbits & (1 << (int) RID_SIGNED))
4708 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4709 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4713 /* Detect the case of an array type of unspecified size
4714 which came, as such, direct from a typedef name.
4715 We must copy the type, so that each identifier gets
4716 a distinct type, so that each identifier's size can be
4717 controlled separately by its own initializer. */
4719 if (type != 0 && typedef_type != 0
4720 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4721 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4723 type = build_array_type (TREE_TYPE (type), 0);
4725 C_TYPE_VARIABLE_SIZE (type) = 1;
4728 /* If this is a type name (such as, in a cast or sizeof),
4729 compute the type and return it now. */
4731 if (decl_context == TYPENAME)
4733 /* Note that the grammar rejects storage classes
4734 in typenames, fields or parameters */
4735 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4737 pedwarn ("ISO C forbids const or volatile function types");
4739 type = c_build_qualified_type (type, type_quals);
4743 /* Aside from typedefs and type names (handle above),
4744 `void' at top level (not within pointer)
4745 is allowed only in public variables.
4746 We don't complain about parms either, but that is because
4747 a better error message can be made later. */
4749 if (VOID_TYPE_P (type) && decl_context != PARM
4750 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4751 && ((specbits & (1 << (int) RID_EXTERN))
4752 || (current_binding_level == global_binding_level
4754 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4756 error ("variable or field `%s' declared void", name);
4757 type = integer_type_node;
4760 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4761 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4766 if (decl_context == PARM)
4768 tree type_as_written = type;
4771 /* A parameter declared as an array of T is really a pointer to T.
4772 One declared as a function is really a pointer to a function. */
4774 if (TREE_CODE (type) == ARRAY_TYPE)
4776 /* Transfer const-ness of array into that of type pointed to. */
4777 type = TREE_TYPE (type);
4779 type = c_build_qualified_type (type, type_quals);
4780 type = build_pointer_type (type);
4781 type_quals = TYPE_UNQUALIFIED;
4784 else if (TREE_CODE (type) == FUNCTION_TYPE)
4786 if (pedantic && type_quals)
4787 pedwarn ("ISO C forbids qualified function types");
4789 type = c_build_qualified_type (type, type_quals);
4790 type = build_pointer_type (type);
4791 type_quals = TYPE_UNQUALIFIED;
4794 decl = build_decl (PARM_DECL, declarator, type);
4796 C_DECL_VARIABLE_SIZE (decl) = 1;
4798 /* Compute the type actually passed in the parmlist,
4799 for the case where there is no prototype.
4800 (For example, shorts and chars are passed as ints.)
4801 When there is a prototype, this is overridden later. */
4803 if (type == error_mark_node)
4804 promoted_type = type;
4807 promoted_type = simple_type_promotes_to (type);
4808 if (! promoted_type)
4809 promoted_type = type;
4812 DECL_ARG_TYPE (decl) = promoted_type;
4813 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4815 else if (decl_context == FIELD)
4817 /* Structure field. It may not be a function. */
4819 if (TREE_CODE (type) == FUNCTION_TYPE)
4821 error ("field `%s' declared as a function", name);
4822 type = build_pointer_type (type);
4824 else if (TREE_CODE (type) != ERROR_MARK
4825 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4827 error ("field `%s' has incomplete type", name);
4828 type = error_mark_node;
4830 /* Move type qualifiers down to element of an array. */
4831 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4833 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4835 TYPE_DOMAIN (type));
4837 /* Leave the field const or volatile as well. */
4838 type_quals = TYPE_UNQUALIFIED;
4841 decl = build_decl (FIELD_DECL, declarator, type);
4842 DECL_NONADDRESSABLE_P (decl) = bitfield;
4845 C_DECL_VARIABLE_SIZE (decl) = 1;
4847 else if (TREE_CODE (type) == FUNCTION_TYPE)
4849 /* Every function declaration is "external"
4850 except for those which are inside a function body
4851 in which `auto' is used.
4852 That is a case not specified by ANSI C,
4853 and we use it for forward declarations for nested functions. */
4854 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4855 || current_binding_level == global_binding_level);
4857 if (specbits & (1 << (int) RID_AUTO)
4858 && (pedantic || current_binding_level == global_binding_level))
4859 pedwarn ("invalid storage class for function `%s'", name);
4860 if (specbits & (1 << (int) RID_REGISTER))
4861 error ("invalid storage class for function `%s'", name);
4862 /* Function declaration not at top level.
4863 Storage classes other than `extern' are not allowed
4864 and `extern' makes no difference. */
4865 if (current_binding_level != global_binding_level
4866 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4868 pedwarn ("invalid storage class for function `%s'", name);
4870 decl = build_decl (FUNCTION_DECL, declarator, type);
4871 decl = build_decl_attribute_variant (decl, decl_machine_attr);
4873 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4874 pedwarn ("ISO C forbids qualified function types");
4876 /* GNU C interprets a `volatile void' return type to indicate
4877 that the function does not return. */
4878 if ((type_quals & TYPE_QUAL_VOLATILE)
4879 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4880 warning ("`noreturn' function returns non-void value");
4883 DECL_EXTERNAL (decl) = 1;
4884 /* Record absence of global scope for `static' or `auto'. */
4886 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4888 /* Record presence of `inline', if it is reasonable. */
4891 if (MAIN_NAME_P (declarator))
4892 warning ("cannot inline function `main'");
4894 /* Assume that otherwise the function can be inlined. */
4895 DECL_INLINE (decl) = 1;
4897 if (specbits & (1 << (int) RID_EXTERN))
4898 current_extern_inline = 1;
4903 /* It's a variable. */
4904 /* An uninitialized decl with `extern' is a reference. */
4905 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4907 /* Move type qualifiers down to element of an array. */
4908 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4910 int saved_align = TYPE_ALIGN(type);
4911 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4913 TYPE_DOMAIN (type));
4914 TYPE_ALIGN (type) = saved_align;
4915 #if 0 /* Leave the variable const or volatile as well. */
4916 type_quals = TYPE_UNQUALIFIED;
4920 decl = build_decl (VAR_DECL, declarator, type);
4922 C_DECL_VARIABLE_SIZE (decl) = 1;
4925 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4927 DECL_EXTERNAL (decl) = extern_ref;
4928 /* At top level, the presence of a `static' or `register' storage
4929 class specifier, or the absence of all storage class specifiers
4930 makes this declaration a definition (perhaps tentative). Also,
4931 the absence of both `static' and `register' makes it public. */
4932 if (current_binding_level == global_binding_level)
4936 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
4937 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
4939 /* Not at top level, only `static' makes a static definition. */
4942 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4943 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
4947 /* Record `register' declaration for warnings on &
4948 and in case doing stupid register allocation. */
4950 if (specbits & (1 << (int) RID_REGISTER))
4951 DECL_REGISTER (decl) = 1;
4953 /* Record constancy and volatility. */
4954 c_apply_type_quals_to_decl (type_quals, decl);
4956 /* If a type has volatile components, it should be stored in memory.
4957 Otherwise, the fact that those components are volatile
4958 will be ignored, and would even crash the compiler. */
4959 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4960 mark_addressable (decl);
4966 /* Decode the parameter-list info for a function type or function definition.
4967 The argument is the value returned by `get_parm_info' (or made in parse.y
4968 if there is an identifier list instead of a parameter decl list).
4969 These two functions are separate because when a function returns
4970 or receives functions then each is called multiple times but the order
4971 of calls is different. The last call to `grokparms' is always the one
4972 that contains the formal parameter names of a function definition.
4974 Store in `last_function_parms' a chain of the decls of parms.
4975 Also store in `last_function_parm_tags' a chain of the struct, union,
4976 and enum tags declared among the parms.
4978 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4980 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4981 a mere declaration. A nonempty identifier-list gets an error message
4982 when FUNCDEF_FLAG is zero. */
4985 grokparms (parms_info, funcdef_flag)
4989 tree first_parm = TREE_CHAIN (parms_info);
4991 last_function_parms = TREE_PURPOSE (parms_info);
4992 last_function_parm_tags = TREE_VALUE (parms_info);
4994 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
4995 && !in_system_header)
4996 warning ("function declaration isn't a prototype");
4999 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
5002 pedwarn ("parameter names (without types) in function declaration");
5004 last_function_parms = first_parm;
5011 /* We no longer test FUNCDEF_FLAG.
5012 If the arg types are incomplete in a declaration,
5013 they must include undefined tags.
5014 These tags can never be defined in the scope of the declaration,
5015 so the types can never be completed,
5016 and no call can be compiled successfully. */
5018 /* In a fcn definition, arg types must be complete. */
5021 for (parm = last_function_parms, typelt = first_parm;
5023 parm = TREE_CHAIN (parm))
5024 /* Skip over any enumeration constants declared here. */
5025 if (TREE_CODE (parm) == PARM_DECL)
5027 /* Barf if the parameter itself has an incomplete type. */
5028 tree type = TREE_VALUE (typelt);
5029 if (type == error_mark_node)
5031 if (!COMPLETE_TYPE_P (type))
5033 if (funcdef_flag && DECL_NAME (parm) != 0)
5034 error ("parameter `%s' has incomplete type",
5035 IDENTIFIER_POINTER (DECL_NAME (parm)));
5037 warning ("parameter has incomplete type");
5040 TREE_VALUE (typelt) = error_mark_node;
5041 TREE_TYPE (parm) = error_mark_node;
5045 /* This has been replaced by parm_tags_warning, which
5046 uses a more accurate criterion for what to warn
5050 /* Now warn if is a pointer to an incomplete type. */
5051 while (TREE_CODE (type) == POINTER_TYPE
5052 || TREE_CODE (type) == REFERENCE_TYPE)
5053 type = TREE_TYPE (type);
5054 type = TYPE_MAIN_VARIANT (type);
5055 if (!COMPLETE_TYPE_P (type))
5057 if (DECL_NAME (parm) != 0)
5058 warning ("parameter `%s' points to incomplete type",
5059 IDENTIFIER_POINTER (DECL_NAME (parm)));
5061 warning ("parameter points to incomplete type");
5065 typelt = TREE_CHAIN (typelt);
5072 /* Return a tree_list node with info on a parameter list just parsed.
5073 The TREE_PURPOSE is a chain of decls of those parms.
5074 The TREE_VALUE is a list of structure, union and enum tags defined.
5075 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5076 This tree_list node is later fed to `grokparms'.
5078 VOID_AT_END nonzero means append `void' to the end of the type-list.
5079 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5082 get_parm_info (void_at_end)
5085 register tree decl, t;
5086 register tree types = 0;
5088 tree tags = gettags ();
5089 tree parms = getdecls ();
5091 tree order = current_binding_level->parm_order;
5093 /* Just `void' (and no ellipsis) is special. There are really no parms.
5094 But if the `void' is qualified (by `const' or `volatile') or has a
5095 storage class specifier (`register'), then the behavior is undefined;
5096 by not counting it as the special case of `void' we will cause an
5097 error later. Typedefs for `void' are OK (see DR#157). */
5098 if (void_at_end && parms != 0
5099 && TREE_CHAIN (parms) == 0
5100 && VOID_TYPE_P (TREE_TYPE (parms))
5101 && ! TREE_THIS_VOLATILE (parms)
5102 && ! TREE_READONLY (parms)
5103 && ! DECL_REGISTER (parms)
5104 && DECL_NAME (parms) == 0)
5107 storedecls (NULL_TREE);
5108 return tree_cons (NULL_TREE, NULL_TREE,
5109 tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5112 /* Extract enumerator values and other non-parms declared with the parms.
5113 Likewise any forward parm decls that didn't have real parm decls. */
5114 for (decl = parms; decl;)
5116 tree next = TREE_CHAIN (decl);
5118 if (TREE_CODE (decl) != PARM_DECL)
5120 TREE_CHAIN (decl) = new_parms;
5123 else if (TREE_ASM_WRITTEN (decl))
5125 error_with_decl (decl,
5126 "parameter `%s' has just a forward declaration");
5127 TREE_CHAIN (decl) = new_parms;
5133 /* Put the parm decls back in the order they were in in the parm list. */
5134 for (t = order; t; t = TREE_CHAIN (t))
5137 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5139 TREE_CHAIN (TREE_VALUE (t)) = 0;
5142 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5145 /* Store the parmlist in the binding level since the old one
5146 is no longer a valid list. (We have changed the chain pointers.) */
5147 storedecls (new_parms);
5149 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5150 /* There may also be declarations for enumerators if an enumeration
5151 type is declared among the parms. Ignore them here. */
5152 if (TREE_CODE (decl) == PARM_DECL)
5154 /* Since there is a prototype,
5155 args are passed in their declared types. */
5156 tree type = TREE_TYPE (decl);
5157 DECL_ARG_TYPE (decl) = type;
5158 if (PROMOTE_PROTOTYPES
5159 && (TREE_CODE (type) == INTEGER_TYPE
5160 || TREE_CODE (type) == ENUMERAL_TYPE)
5161 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5162 DECL_ARG_TYPE (decl) = integer_type_node;
5164 types = tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5165 if (VOID_TYPE_P (TREE_VALUE (types)) && ! erred
5166 && DECL_NAME (decl) == 0)
5168 error ("`void' in parameter list must be the entire list");
5174 return tree_cons (new_parms, tags,
5175 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
5177 return tree_cons (new_parms, tags, nreverse (types));
5180 /* At end of parameter list, warn about any struct, union or enum tags
5181 defined within. Do so because these types cannot ever become complete. */
5184 parmlist_tags_warning ()
5189 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5191 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5192 /* An anonymous union parm type is meaningful as a GNU extension.
5193 So don't warn for that. */
5194 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5196 if (TREE_PURPOSE (elt) != 0)
5197 warning ("`%s %s' declared inside parameter list",
5198 (code == RECORD_TYPE ? "struct"
5199 : code == UNION_TYPE ? "union"
5201 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5204 /* For translation these need to be seperate warnings */
5205 if (code == RECORD_TYPE)
5206 warning ("anonymous struct declared inside parameter list");
5207 else if (code == UNION_TYPE)
5208 warning ("anonymous union declared inside parameter list");
5210 warning ("anonymous enum declared inside parameter list");
5214 warning ("its scope is only this definition or declaration, which is probably not what you want.");
5220 /* Get the struct, enum or union (CODE says which) with tag NAME.
5221 Define the tag as a forward-reference if it is not defined. */
5224 xref_tag (code, name)
5225 enum tree_code code;
5228 /* If a cross reference is requested, look up the type
5229 already defined for this tag and return it. */
5231 register tree ref = lookup_tag (code, name, current_binding_level, 0);
5232 /* Even if this is the wrong type of tag, return what we found.
5233 There will be an error message anyway, from pending_xref_error.
5234 If we create an empty xref just for an invalid use of the type,
5235 the main result is to create lots of superfluous error messages. */
5239 /* If no such tag is yet defined, create a forward-reference node
5240 and record it as the "definition".
5241 When a real declaration of this type is found,
5242 the forward-reference will be altered into a real type. */
5244 ref = make_node (code);
5245 if (code == ENUMERAL_TYPE)
5247 /* (In ANSI, Enums can be referred to only if already defined.) */
5249 pedwarn ("ISO C forbids forward references to `enum' types");
5250 /* Give the type a default layout like unsigned int
5251 to avoid crashing if it does not get defined. */
5252 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5253 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5254 TYPE_USER_ALIGN (ref) = 0;
5255 TREE_UNSIGNED (ref) = 1;
5256 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5257 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5258 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5261 pushtag (name, ref);
5266 /* Make sure that the tag NAME is defined *in the current binding level*
5267 at least as a forward reference.
5268 CODE says which kind of tag NAME ought to be. */
5271 start_struct (code, name)
5272 enum tree_code code;
5275 /* If there is already a tag defined at this binding level
5276 (as a forward reference), just return it. */
5278 register tree ref = 0;
5281 ref = lookup_tag (code, name, current_binding_level, 1);
5282 if (ref && TREE_CODE (ref) == code)
5284 C_TYPE_BEING_DEFINED (ref) = 1;
5285 TYPE_PACKED (ref) = flag_pack_struct;
5286 if (TYPE_FIELDS (ref))
5287 error ("redefinition of `%s %s'",
5288 code == UNION_TYPE ? "union" : "struct",
5289 IDENTIFIER_POINTER (name));
5294 /* Otherwise create a forward-reference just so the tag is in scope. */
5296 ref = make_node (code);
5297 pushtag (name, ref);
5298 C_TYPE_BEING_DEFINED (ref) = 1;
5299 TYPE_PACKED (ref) = flag_pack_struct;
5303 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5304 of a structure component, returning a FIELD_DECL node.
5305 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5307 This is done during the parsing of the struct declaration.
5308 The FIELD_DECL nodes are chained together and the lot of them
5309 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5312 grokfield (filename, line, declarator, declspecs, width)
5313 const char *filename ATTRIBUTE_UNUSED;
5314 int line ATTRIBUTE_UNUSED;
5315 tree declarator, declspecs, width;
5319 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5321 finish_decl (value, NULL_TREE, NULL_TREE);
5322 DECL_INITIAL (value) = width;
5324 maybe_objc_check_decl (value);
5328 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5329 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5330 ATTRIBUTES are attributes to be applied to the structure. */
5333 finish_struct (t, fieldlist, attributes)
5339 int toplevel = global_binding_level == current_binding_level;
5341 /* If this type was previously laid out as a forward reference,
5342 make sure we lay it out again. */
5346 decl_attributes (t, attributes, NULL_TREE);
5348 /* Nameless union parm types are useful as GCC extension. */
5349 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5350 /* Otherwise, warn about any struct or union def. in parmlist. */
5351 if (in_parm_level_p ())
5354 pedwarn ("%s defined inside parms",
5355 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5356 else if (! flag_traditional)
5357 warning ("%s defined inside parms",
5358 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5363 for (x = fieldlist; x; x = TREE_CHAIN (x))
5364 if (DECL_NAME (x) != 0)
5368 pedwarn ("%s has no %s",
5369 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
5370 fieldlist ? _("named members") : _("members"));
5373 /* Install struct as DECL_CONTEXT of each field decl.
5374 Also process specified field sizes,m which is found in the DECL_INITIAL.
5375 Store 0 there, except for ": 0" fields (so we can find them
5376 and delete them, below). */
5378 for (x = fieldlist; x; x = TREE_CHAIN (x))
5380 DECL_CONTEXT (x) = t;
5381 DECL_PACKED (x) |= TYPE_PACKED (t);
5383 /* If any field is const, the structure type is pseudo-const. */
5384 if (TREE_READONLY (x))
5385 C_TYPE_FIELDS_READONLY (t) = 1;
5388 /* A field that is pseudo-const makes the structure likewise. */
5389 tree t1 = TREE_TYPE (x);
5390 while (TREE_CODE (t1) == ARRAY_TYPE)
5391 t1 = TREE_TYPE (t1);
5392 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5393 && C_TYPE_FIELDS_READONLY (t1))
5394 C_TYPE_FIELDS_READONLY (t) = 1;
5397 /* Any field that is volatile means variables of this type must be
5398 treated in some ways as volatile. */
5399 if (TREE_THIS_VOLATILE (x))
5400 C_TYPE_FIELDS_VOLATILE (t) = 1;
5402 /* Any field of nominal variable size implies structure is too. */
5403 if (C_DECL_VARIABLE_SIZE (x))
5404 C_TYPE_VARIABLE_SIZE (t) = 1;
5406 /* Detect invalid nested redefinition. */
5407 if (TREE_TYPE (x) == t)
5408 error ("nested redefinition of `%s'",
5409 IDENTIFIER_POINTER (TYPE_NAME (t)));
5411 /* Detect invalid bit-field size. */
5412 if (DECL_INITIAL (x))
5413 STRIP_NOPS (DECL_INITIAL (x));
5414 if (DECL_INITIAL (x))
5416 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5417 constant_expression_warning (DECL_INITIAL (x));
5421 "bit-field `%s' width not an integer constant");
5422 DECL_INITIAL (x) = NULL;
5426 /* Detect invalid bit-field type. */
5427 if (DECL_INITIAL (x)
5428 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5429 && TREE_CODE (TREE_TYPE (x)) != BOOLEAN_TYPE
5430 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5432 error_with_decl (x, "bit-field `%s' has invalid type");
5433 DECL_INITIAL (x) = NULL;
5436 if (DECL_INITIAL (x) && pedantic
5437 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5438 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5439 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != c_bool_type_node
5440 /* Accept an enum that's equivalent to int or unsigned int. */
5441 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5442 && (TYPE_PRECISION (TREE_TYPE (x))
5443 == TYPE_PRECISION (integer_type_node))))
5444 pedwarn_with_decl (x, "bit-field `%s' type invalid in ISO C");
5446 /* Detect and ignore out of range field width and process valid
5448 if (DECL_INITIAL (x))
5451 if (TYPE_MAIN_VARIANT (TREE_TYPE (x)) == c_bool_type_node)
5452 max_width = CHAR_TYPE_SIZE;
5454 max_width = TYPE_PRECISION (TREE_TYPE (x));
5455 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5456 error_with_decl (x, "negative width in bit-field `%s'");
5457 else if (0 < compare_tree_int (DECL_INITIAL (x), max_width))
5458 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5459 else if (integer_zerop (DECL_INITIAL (x)) && DECL_NAME (x) != 0)
5460 error_with_decl (x, "zero width for bit-field `%s'");
5463 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
5464 unsigned HOST_WIDE_INT width
5465 = TREE_INT_CST_LOW (DECL_INITIAL (x));
5467 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5468 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5469 TREE_UNSIGNED (TREE_TYPE (x)))
5471 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5472 TREE_UNSIGNED (TREE_TYPE (x))))))
5473 warning_with_decl (x,
5474 "`%s' is narrower than values of its type");
5476 DECL_SIZE (x) = bitsize_int (width);
5477 DECL_BIT_FIELD (x) = 1;
5478 SET_DECL_C_BIT_FIELD (x);
5482 /* field size 0 => force desired amount of alignment. */
5483 #ifdef EMPTY_FIELD_BOUNDARY
5484 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5486 #ifdef PCC_BITFIELD_TYPE_MATTERS
5487 if (PCC_BITFIELD_TYPE_MATTERS)
5489 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5490 TYPE_ALIGN (TREE_TYPE (x)));
5491 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5498 else if (TREE_TYPE (x) != error_mark_node)
5500 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5501 : TYPE_ALIGN (TREE_TYPE (x)));
5503 /* Non-bit-fields are aligned for their type, except packed
5504 fields which require only BITS_PER_UNIT alignment. */
5505 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5506 if (! DECL_PACKED (x))
5507 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5510 DECL_INITIAL (x) = 0;
5513 /* Delete all duplicate fields from the fieldlist */
5514 for (x = fieldlist; x && TREE_CHAIN (x);)
5515 /* Anonymous fields aren't duplicates. */
5516 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5520 register tree y = fieldlist;
5524 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5530 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5532 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5533 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5539 /* Now we have the nearly final fieldlist. Record it,
5540 then lay out the structure or union (including the fields). */
5542 TYPE_FIELDS (t) = fieldlist;
5546 /* Delete all zero-width bit-fields from the fieldlist */
5548 tree *fieldlistp = &fieldlist;
5550 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5551 *fieldlistp = TREE_CHAIN (*fieldlistp);
5553 fieldlistp = &TREE_CHAIN (*fieldlistp);
5556 /* Now we have the truly final field list.
5557 Store it in this type and in the variants. */
5559 TYPE_FIELDS (t) = fieldlist;
5561 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5563 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5564 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5565 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5566 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5569 /* If this was supposed to be a transparent union, but we can't
5570 make it one, warn and turn off the flag. */
5571 if (TREE_CODE (t) == UNION_TYPE
5572 && TYPE_TRANSPARENT_UNION (t)
5573 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5575 TYPE_TRANSPARENT_UNION (t) = 0;
5576 warning ("union cannot be made transparent");
5579 /* If this structure or union completes the type of any previous
5580 variable declaration, lay it out and output its rtl. */
5582 if (current_binding_level->n_incomplete != 0)
5585 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5587 if (TYPE_MAIN_VARIANT (TREE_TYPE (decl)) == TYPE_MAIN_VARIANT (t)
5588 && TREE_CODE (decl) != TYPE_DECL)
5590 layout_decl (decl, 0);
5591 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5592 maybe_objc_check_decl (decl);
5593 rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0);
5596 --current_binding_level->n_incomplete;
5598 else if (!COMPLETE_TYPE_P (TREE_TYPE (decl))
5599 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5601 tree element = TREE_TYPE (decl);
5602 while (TREE_CODE (element) == ARRAY_TYPE)
5603 element = TREE_TYPE (element);
5605 layout_array_type (TREE_TYPE (decl));
5610 /* Finish debugging output for this type. */
5611 rest_of_type_compilation (t, toplevel);
5616 /* Lay out the type T, and its element type, and so on. */
5619 layout_array_type (t)
5622 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5623 layout_array_type (TREE_TYPE (t));
5627 /* Begin compiling the definition of an enumeration type.
5628 NAME is its name (or null if anonymous).
5629 Returns the type object, as yet incomplete.
5630 Also records info about it so that build_enumerator
5631 may be used to declare the individual values as they are read. */
5637 register tree enumtype = 0;
5639 /* If this is the real definition for a previous forward reference,
5640 fill in the contents in the same object that used to be the
5641 forward reference. */
5644 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5646 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5648 enumtype = make_node (ENUMERAL_TYPE);
5649 pushtag (name, enumtype);
5652 C_TYPE_BEING_DEFINED (enumtype) = 1;
5654 if (TYPE_VALUES (enumtype) != 0)
5656 /* This enum is a named one that has been declared already. */
5657 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5659 /* Completely replace its old definition.
5660 The old enumerators remain defined, however. */
5661 TYPE_VALUES (enumtype) = 0;
5664 enum_next_value = integer_zero_node;
5667 if (flag_short_enums)
5668 TYPE_PACKED (enumtype) = 1;
5673 /* After processing and defining all the values of an enumeration type,
5674 install their decls in the enumeration type and finish it off.
5675 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5676 and ATTRIBUTES are the specified attributes.
5677 Returns ENUMTYPE. */
5680 finish_enum (enumtype, values, attributes)
5685 register tree pair, tem;
5686 tree minnode = 0, maxnode = 0, enum_value_type;
5687 int precision, unsign;
5688 int toplevel = (global_binding_level == current_binding_level);
5690 if (in_parm_level_p ())
5691 warning ("enum defined inside parms");
5693 decl_attributes (enumtype, attributes, NULL_TREE);
5695 /* Calculate the maximum value of any enumerator in this type. */
5697 if (values == error_mark_node)
5698 minnode = maxnode = integer_zero_node;
5701 minnode = maxnode = TREE_VALUE (values);
5702 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5704 tree value = TREE_VALUE (pair);
5705 if (tree_int_cst_lt (maxnode, value))
5707 if (tree_int_cst_lt (value, minnode))
5712 /* Construct the final type of this enumeration. It is the same
5713 as one of the integral types - the narrowest one that fits, except
5714 that normally we only go as narrow as int - and signed iff any of
5715 the values are negative. */
5716 unsign = (tree_int_cst_sgn (minnode) >= 0);
5717 precision = MAX (min_precision (minnode, unsign),
5718 min_precision (maxnode, unsign));
5719 if (!TYPE_PACKED (enumtype))
5720 precision = MAX (precision, TYPE_PRECISION (integer_type_node));
5721 if (type_for_size (precision, unsign) == 0)
5723 warning ("enumeration values exceed range of largest integer");
5724 precision = TYPE_PRECISION (long_long_integer_type_node);
5727 if (precision == TYPE_PRECISION (integer_type_node))
5728 enum_value_type = type_for_size (precision, 0);
5730 enum_value_type = enumtype;
5732 TYPE_MIN_VALUE (enumtype) = minnode;
5733 TYPE_MAX_VALUE (enumtype) = maxnode;
5734 TYPE_PRECISION (enumtype) = precision;
5735 TREE_UNSIGNED (enumtype) = unsign;
5736 TYPE_SIZE (enumtype) = 0;
5737 layout_type (enumtype);
5739 if (values != error_mark_node)
5741 /* Change the type of the enumerators to be the enum type. We
5742 need to do this irrespective of the size of the enum, for
5743 proper type checking. Replace the DECL_INITIALs of the
5744 enumerators, and the value slots of the list, with copies
5745 that have the enum type; they cannot be modified in place
5746 because they may be shared (e.g. integer_zero_node) Finally,
5747 change the purpose slots to point to the names of the decls. */
5748 for (pair = values; pair; pair = TREE_CHAIN (pair))
5750 tree enu = TREE_PURPOSE (pair);
5752 TREE_TYPE (enu) = enumtype;
5753 DECL_SIZE (enu) = TYPE_SIZE (enumtype);
5754 DECL_SIZE_UNIT (enu) = TYPE_SIZE_UNIT (enumtype);
5755 DECL_ALIGN (enu) = TYPE_ALIGN (enumtype);
5756 DECL_USER_ALIGN (enu) = TYPE_USER_ALIGN (enumtype);
5757 DECL_MODE (enu) = TYPE_MODE (enumtype);
5759 /* The ISO C Standard mandates enumerators to have type int,
5760 even though the underlying type of an enum type is
5761 unspecified. Here we convert any enumerators that fit in
5762 an int to type int, to avoid promotions to unsigned types
5763 when comparing integers with enumerators that fit in the
5764 int range. When -pedantic is given, build_enumerator()
5765 would have already taken care of those that don't fit. */
5766 if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
5767 DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
5769 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5771 TREE_PURPOSE (pair) = DECL_NAME (enu);
5772 TREE_VALUE (pair) = DECL_INITIAL (enu);
5775 TYPE_VALUES (enumtype) = values;
5778 /* Fix up all variant types of this enum type. */
5779 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5781 if (tem == enumtype)
5783 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5784 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5785 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5786 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5787 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5788 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5789 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5790 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5791 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5792 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5795 /* Finish debugging output for this type. */
5796 rest_of_type_compilation (enumtype, toplevel);
5801 /* Build and install a CONST_DECL for one value of the
5802 current enumeration type (one that was begun with start_enum).
5803 Return a tree-list containing the CONST_DECL and its value.
5804 Assignment of sequential values by default is handled here. */
5807 build_enumerator (name, value)
5810 register tree decl, type;
5812 /* Validate and default VALUE. */
5814 /* Remove no-op casts from the value. */
5816 STRIP_TYPE_NOPS (value);
5820 if (TREE_CODE (value) == INTEGER_CST)
5822 value = default_conversion (value);
5823 constant_expression_warning (value);
5827 error ("enumerator value for `%s' not integer constant",
5828 IDENTIFIER_POINTER (name));
5833 /* Default based on previous value. */
5834 /* It should no longer be possible to have NON_LVALUE_EXPR
5838 value = enum_next_value;
5840 error ("overflow in enumeration values");
5843 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5845 pedwarn ("ISO C restricts enumerator values to range of `int'");
5846 value = convert (integer_type_node, value);
5849 /* Set basis for default for next value. */
5850 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5851 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5853 /* Now create a declaration for the enum value name. */
5855 type = TREE_TYPE (value);
5856 type = type_for_size (MAX (TYPE_PRECISION (type),
5857 TYPE_PRECISION (integer_type_node)),
5859 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
5860 && TREE_UNSIGNED (type)));
5862 decl = build_decl (CONST_DECL, name, type);
5863 DECL_INITIAL (decl) = convert (type, value);
5866 return tree_cons (decl, value, NULL_TREE);
5870 /* Create the FUNCTION_DECL for a function definition.
5871 DECLSPECS, DECLARATOR, PREFIX_ATTRIBUTES and ATTRIBUTES are the parts of
5872 the declaration; they describe the function's name and the type it returns,
5873 but twisted together in a fashion that parallels the syntax of C.
5875 This function creates a binding context for the function body
5876 as well as setting up the FUNCTION_DECL in current_function_decl.
5878 Returns 1 on success. If the DECLARATOR is not suitable for a function
5879 (it defines a datum instead), we return 0, which tells
5880 yyparse to report a parse error. */
5883 start_function (declspecs, declarator, prefix_attributes, attributes)
5884 tree declarator, declspecs, prefix_attributes, attributes;
5886 tree decl1, old_decl;
5888 int old_immediate_size_expand = immediate_size_expand;
5890 current_function_returns_value = 0; /* Assume, until we see it does. */
5891 current_function_returns_null = 0;
5892 warn_about_return_type = 0;
5893 current_extern_inline = 0;
5894 c_function_varargs = 0;
5896 shadowed_labels = 0;
5898 /* Don't expand any sizes in the return type of the function. */
5899 immediate_size_expand = 0;
5901 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
5903 /* If the declarator is not suitable for a function definition,
5904 cause a syntax error. */
5907 immediate_size_expand = old_immediate_size_expand;
5911 decl_attributes (decl1, prefix_attributes, attributes);
5913 announce_function (decl1);
5915 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5917 error ("return type is an incomplete type");
5918 /* Make it return void instead. */
5920 = build_function_type (void_type_node,
5921 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5924 if (warn_about_return_type)
5925 pedwarn_c99 ("return type defaults to `int'");
5927 /* Save the parm names or decls from this function's declarator
5928 where store_parm_decls will find them. */
5929 current_function_parms = last_function_parms;
5930 current_function_parm_tags = last_function_parm_tags;
5932 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5933 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5934 DECL_INITIAL (decl1) = error_mark_node;
5936 /* If this definition isn't a prototype and we had a prototype declaration
5937 before, copy the arg type info from that prototype.
5938 But not if what we had before was a builtin function. */
5939 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5940 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5941 && !DECL_BUILT_IN (old_decl)
5942 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5943 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5944 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5946 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5947 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
5948 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
5951 /* If there is no explicit declaration, look for any out-of-scope implicit
5954 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
5956 /* Optionally warn of old-fashioned def with no previous prototype. */
5957 if (warn_strict_prototypes
5958 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5959 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
5960 warning ("function declaration isn't a prototype");
5961 /* Optionally warn of any global def with no previous prototype. */
5962 else if (warn_missing_prototypes
5963 && TREE_PUBLIC (decl1)
5964 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0)
5965 && ! MAIN_NAME_P (DECL_NAME (decl1)))
5966 warning_with_decl (decl1, "no previous prototype for `%s'");
5967 /* Optionally warn of any def with no previous prototype
5968 if the function has already been used. */
5969 else if (warn_missing_prototypes
5970 && old_decl != 0 && TREE_USED (old_decl)
5971 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5972 warning_with_decl (decl1,
5973 "`%s' was used with no prototype before its definition");
5974 /* Optionally warn of any global def with no previous declaration. */
5975 else if (warn_missing_declarations
5976 && TREE_PUBLIC (decl1)
5978 && ! MAIN_NAME_P (DECL_NAME (decl1)))
5979 warning_with_decl (decl1, "no previous declaration for `%s'");
5980 /* Optionally warn of any def with no previous declaration
5981 if the function has already been used. */
5982 else if (warn_missing_declarations
5983 && old_decl != 0 && TREE_USED (old_decl)
5984 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
5985 warning_with_decl (decl1,
5986 "`%s' was used with no declaration before its definition");
5988 /* This is a definition, not a reference.
5989 So normally clear DECL_EXTERNAL.
5990 However, `extern inline' acts like a declaration
5991 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5992 DECL_EXTERNAL (decl1) = current_extern_inline;
5994 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
5995 SET_DEFAULT_DECL_ATTRIBUTES (decl1, attributes);
5998 /* This function exists in static storage.
5999 (This does not mean `static' in the C sense!) */
6000 TREE_STATIC (decl1) = 1;
6002 /* A nested function is not global. */
6003 if (current_function_decl != 0)
6004 TREE_PUBLIC (decl1) = 0;
6006 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6007 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
6012 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6013 != integer_type_node)
6014 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
6016 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
6017 args = TREE_CHAIN (args))
6019 tree type = args ? TREE_VALUE (args) : 0;
6021 if (type == void_type_node)
6028 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6029 pedwarn_with_decl (decl1,
6030 "first argument of `%s' should be `int'");
6034 if (TREE_CODE (type) != POINTER_TYPE
6035 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6036 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6038 pedwarn_with_decl (decl1,
6039 "second argument of `%s' should be `char **'");
6043 if (TREE_CODE (type) != POINTER_TYPE
6044 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6045 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6047 pedwarn_with_decl (decl1,
6048 "third argument of `%s' should probably be `char **'");
6053 /* It is intentional that this message does not mention the third
6054 argument, which is warned for only pedantically, because it's
6055 blessed by mention in an appendix of the standard. */
6056 if (argct > 0 && (argct < 2 || argct > 3))
6057 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
6059 if (argct == 3 && pedantic)
6060 pedwarn_with_decl (decl1, "third argument of `%s' is deprecated");
6062 if (! TREE_PUBLIC (decl1))
6063 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
6066 /* Record the decl so that the function name is defined.
6067 If we already have a decl for this name, and it is a FUNCTION_DECL,
6068 use the old decl. */
6070 current_function_decl = pushdecl (decl1);
6073 declare_parm_level (1);
6074 current_binding_level->subblocks_tag_transparent = 1;
6076 make_function_rtl (current_function_decl);
6078 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6079 /* Promote the value to int before returning it. */
6080 if (C_PROMOTING_INTEGER_TYPE_P (restype))
6082 /* It retains unsignedness if traditional
6083 or if not really getting wider. */
6084 if (TREE_UNSIGNED (restype)
6085 && (flag_traditional
6086 || (TYPE_PRECISION (restype)
6087 == TYPE_PRECISION (integer_type_node))))
6088 restype = unsigned_type_node;
6090 restype = integer_type_node;
6092 DECL_RESULT (current_function_decl)
6093 = build_decl (RESULT_DECL, NULL_TREE, restype);
6095 /* If this fcn was already referenced via a block-scope `extern' decl
6096 (or an implicit decl), propagate certain information about the usage. */
6097 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6098 TREE_ADDRESSABLE (current_function_decl) = 1;
6100 immediate_size_expand = old_immediate_size_expand;
6105 /* Record that this function is going to be a varargs function.
6106 This is called before store_parm_decls, which is too early
6107 to call mark_varargs directly. */
6112 c_function_varargs = 1;
6115 /* Store the parameter declarations into the current function declaration.
6116 This is called after parsing the parameter declarations, before
6117 digesting the body of the function.
6119 For an old-style definition, modify the function's type
6120 to specify at least the number of arguments. */
6125 register tree fndecl = current_function_decl;
6128 /* This is either a chain of PARM_DECLs (if a prototype was used)
6129 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6130 tree specparms = current_function_parms;
6132 /* This is a list of types declared among parms in a prototype. */
6133 tree parmtags = current_function_parm_tags;
6135 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6136 register tree parmdecls = getdecls ();
6138 /* This is a chain of any other decls that came in among the parm
6139 declarations. If a parm is declared with enum {foo, bar} x;
6140 then CONST_DECLs for foo and bar are put here. */
6143 /* Nonzero if this definition is written with a prototype. */
6146 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6148 /* This case is when the function was defined with an ANSI prototype.
6149 The parms already have decls, so we need not do anything here
6150 except record them as in effect
6151 and complain if any redundant old-style parm decls were written. */
6162 error_with_decl (fndecl,
6163 "parm types given both in parmlist and separately");
6164 /* Get rid of the erroneous decls; don't keep them on
6165 the list of parms, since they might not be PARM_DECLs. */
6166 for (decl = current_binding_level->names;
6167 decl; decl = TREE_CHAIN (decl))
6168 if (DECL_NAME (decl))
6169 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6170 for (link = current_binding_level->shadowed;
6171 link; link = TREE_CHAIN (link))
6172 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6173 current_binding_level->names = 0;
6174 current_binding_level->shadowed = 0;
6177 specparms = nreverse (specparms);
6178 for (parm = specparms; parm; parm = next)
6180 next = TREE_CHAIN (parm);
6181 if (TREE_CODE (parm) == PARM_DECL)
6183 if (DECL_NAME (parm) == 0)
6184 error_with_decl (parm, "parameter name omitted");
6185 else if (TREE_CODE (TREE_TYPE (parm)) != ERROR_MARK
6186 && VOID_TYPE_P (TREE_TYPE (parm)))
6188 error_with_decl (parm, "parameter `%s' declared void");
6189 /* Change the type to error_mark_node so this parameter
6190 will be ignored by assign_parms. */
6191 TREE_TYPE (parm) = error_mark_node;
6197 /* If we find an enum constant or a type tag,
6198 put it aside for the moment. */
6199 TREE_CHAIN (parm) = 0;
6200 others = chainon (others, parm);
6204 /* Get the decls in their original chain order
6205 and record in the function. */
6206 DECL_ARGUMENTS (fndecl) = getdecls ();
6209 /* If this function takes a variable number of arguments,
6210 add a phony parameter to the end of the parm list,
6211 to represent the position of the first unnamed argument. */
6212 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6215 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6216 /* Let's hope the address of the unnamed parm
6217 won't depend on its type. */
6218 TREE_TYPE (dummy) = integer_type_node;
6219 DECL_ARG_TYPE (dummy) = integer_type_node;
6220 DECL_ARGUMENTS (fndecl) = chainon (DECL_ARGUMENTS (fndecl), dummy);
6224 /* Now pushdecl the enum constants. */
6225 for (parm = others; parm; parm = next)
6227 next = TREE_CHAIN (parm);
6228 if (DECL_NAME (parm) == 0)
6230 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6232 else if (TREE_CODE (parm) != PARM_DECL)
6236 storetags (chainon (parmtags, gettags ()));
6240 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6241 each with a parm name as the TREE_VALUE.
6243 PARMDECLS is a chain of declarations for parameters.
6244 Warning! It can also contain CONST_DECLs which are not parameters
6245 but are names of enumerators of any enum types
6246 declared among the parameters.
6248 First match each formal parameter name with its declaration.
6249 Associate decls with the names and store the decls
6250 into the TREE_PURPOSE slots. */
6252 /* We use DECL_WEAK as a flag to show which parameters have been
6253 seen already since it is not used on PARM_DECL or CONST_DECL. */
6254 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6255 DECL_WEAK (parm) = 0;
6257 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6259 register tree tail, found = NULL;
6261 if (TREE_VALUE (parm) == 0)
6263 error_with_decl (fndecl,
6264 "parameter name missing from parameter list");
6265 TREE_PURPOSE (parm) = 0;
6269 /* See if any of the parmdecls specifies this parm by name.
6270 Ignore any enumerator decls. */
6271 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6272 if (DECL_NAME (tail) == TREE_VALUE (parm)
6273 && TREE_CODE (tail) == PARM_DECL)
6279 /* If declaration already marked, we have a duplicate name.
6280 Complain, and don't use this decl twice. */
6281 if (found && DECL_WEAK (found))
6283 error_with_decl (found, "multiple parameters named `%s'");
6287 /* If the declaration says "void", complain and ignore it. */
6288 if (found && VOID_TYPE_P (TREE_TYPE (found)))
6290 error_with_decl (found, "parameter `%s' declared void");
6291 TREE_TYPE (found) = integer_type_node;
6292 DECL_ARG_TYPE (found) = integer_type_node;
6293 layout_decl (found, 0);
6296 /* Traditionally, a parm declared float is actually a double. */
6297 if (found && flag_traditional
6298 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6300 TREE_TYPE (found) = double_type_node;
6301 DECL_ARG_TYPE (found) = double_type_node;
6302 layout_decl (found, 0);
6305 /* If no declaration found, default to int. */
6308 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6310 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6311 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6312 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6314 pedwarn_with_decl (found, "type of `%s' defaults to `int'");
6315 else if (extra_warnings)
6316 warning_with_decl (found, "type of `%s' defaults to `int'");
6320 TREE_PURPOSE (parm) = found;
6322 /* Mark this decl as "already found". */
6323 DECL_WEAK (found) = 1;
6326 /* Put anything which is on the parmdecls chain and which is
6327 not a PARM_DECL onto the list NONPARMS. (The types of
6328 non-parm things which might appear on the list include
6329 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6330 any actual PARM_DECLs not matched with any names. */
6333 for (parm = parmdecls; parm;)
6335 tree next = TREE_CHAIN (parm);
6336 TREE_CHAIN (parm) = 0;
6338 if (TREE_CODE (parm) != PARM_DECL)
6339 nonparms = chainon (nonparms, parm);
6342 /* Complain about args with incomplete types. */
6343 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6345 error_with_decl (parm, "parameter `%s' has incomplete type");
6346 TREE_TYPE (parm) = error_mark_node;
6349 if (! DECL_WEAK (parm))
6351 error_with_decl (parm,
6352 "declaration for parameter `%s' but no such parameter");
6353 /* Pretend the parameter was not missing.
6354 This gets us to a standard state and minimizes
6355 further error messages. */
6357 = chainon (specparms,
6358 tree_cons (parm, NULL_TREE, NULL_TREE));
6365 /* Chain the declarations together in the order of the list of
6366 names. Store that chain in the function decl, replacing the
6369 DECL_ARGUMENTS (fndecl) = 0;
6372 for (last = 0; parm; parm = TREE_CHAIN (parm))
6373 if (TREE_PURPOSE (parm))
6376 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6378 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6379 last = TREE_PURPOSE (parm);
6380 TREE_CHAIN (last) = 0;
6384 /* If there was a previous prototype,
6385 set the DECL_ARG_TYPE of each argument according to
6386 the type previously specified, and report any mismatches. */
6388 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6391 for (parm = DECL_ARGUMENTS (fndecl),
6392 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6393 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6394 != void_type_node));
6395 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6397 if (parm == 0 || type == 0
6398 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6400 error ("number of arguments doesn't match prototype");
6401 error_with_file_and_line (current_function_prototype_file,
6402 current_function_prototype_line,
6403 "prototype declaration");
6406 /* Type for passing arg must be consistent
6407 with that declared for the arg. */
6408 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
6410 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6411 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6413 /* Adjust argument to match prototype. E.g. a previous
6414 `int foo(float);' prototype causes
6415 `int foo(x) float x; {...}' to be treated like
6416 `int foo(float x) {...}'. This is particularly
6417 useful for argument types like uid_t. */
6418 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6420 if (PROMOTE_PROTOTYPES
6421 && (TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
6422 || TREE_CODE (TREE_TYPE (parm)) == ENUMERAL_TYPE)
6423 && TYPE_PRECISION (TREE_TYPE (parm))
6424 < TYPE_PRECISION (integer_type_node))
6425 DECL_ARG_TYPE (parm) = integer_type_node;
6429 pedwarn ("promoted argument `%s' doesn't match prototype",
6430 IDENTIFIER_POINTER (DECL_NAME (parm)));
6431 warning_with_file_and_line
6432 (current_function_prototype_file,
6433 current_function_prototype_line,
6434 "prototype declaration");
6437 /* If -traditional, allow `int' argument to match
6438 `unsigned' prototype. */
6439 else if (! (flag_traditional
6440 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6441 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6443 error ("argument `%s' doesn't match prototype",
6444 IDENTIFIER_POINTER (DECL_NAME (parm)));
6445 error_with_file_and_line (current_function_prototype_file,
6446 current_function_prototype_line,
6447 "prototype declaration");
6451 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6454 /* Otherwise, create a prototype that would match. */
6458 tree actual = 0, last = 0, type;
6460 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6462 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6464 TREE_CHAIN (last) = type;
6469 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6471 TREE_CHAIN (last) = type;
6475 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6476 of the type of this function, but we need to avoid having this
6477 affect the types of other similarly-typed functions, so we must
6478 first force the generation of an identical (but separate) type
6479 node for the relevant function type. The new node we create
6480 will be a variant of the main variant of the original function
6483 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6485 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6488 /* Now store the final chain of decls for the arguments
6489 as the decl-chain of the current lexical scope.
6490 Put the enumerators in as well, at the front so that
6491 DECL_ARGUMENTS is not modified. */
6493 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6496 /* Make sure the binding level for the top of the function body
6497 gets a BLOCK if there are any in the function.
6498 Otherwise, the dbx output is wrong. */
6500 keep_next_if_subblocks = 1;
6502 /* ??? This might be an improvement,
6503 but needs to be thought about some more. */
6505 keep_next_level_flag = 1;
6508 /* Write a record describing this function definition to the prototypes
6509 file (if requested). */
6511 gen_aux_info_record (fndecl, 1, 0, prototype);
6513 /* Initialize the RTL code for the function. */
6515 init_function_start (fndecl, input_filename, lineno);
6517 /* Begin the statement tree for this function. */
6518 DECL_LANG_SPECIFIC (current_function_decl)
6519 =((struct lang_decl *) ggc_alloc (sizeof (struct lang_decl)));
6520 begin_stmt_tree (&DECL_SAVED_TREE (current_function_decl));
6522 /* This function is being processed in whole-function mode. */
6523 cfun->x_whole_function_mode_p = 1;
6525 /* Even though we're inside a function body, we still don't want to
6526 call expand_expr to calculate the size of a variable-sized array.
6527 We haven't necessarily assigned RTL to all variables yet, so it's
6528 not safe to try to expand expressions involving them. */
6529 immediate_size_expand = 0;
6530 cfun->x_dont_save_pending_sizes_p = 1;
6533 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6534 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6535 stands for an ellipsis in the identifier list.
6537 PARMLIST is the data returned by get_parm_info for the
6538 parmlist that follows the semicolon.
6540 We return a value of the same sort that get_parm_info returns,
6541 except that it describes the combination of identifiers and parmlist. */
6544 combine_parm_decls (specparms, parmlist, void_at_end)
6545 tree specparms, parmlist;
6548 register tree fndecl = current_function_decl;
6551 tree parmdecls = TREE_PURPOSE (parmlist);
6553 /* This is a chain of any other decls that came in among the parm
6554 declarations. They were separated already by get_parm_info,
6555 so we just need to keep them separate. */
6556 tree nonparms = TREE_VALUE (parmlist);
6560 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6561 DECL_WEAK (parm) = 0;
6563 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6565 register tree tail, found = NULL;
6567 /* See if any of the parmdecls specifies this parm by name. */
6568 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6569 if (DECL_NAME (tail) == TREE_VALUE (parm))
6575 /* If declaration already marked, we have a duplicate name.
6576 Complain, and don't use this decl twice. */
6577 if (found && DECL_WEAK (found))
6579 error_with_decl (found, "multiple parameters named `%s'");
6583 /* If the declaration says "void", complain and ignore it. */
6584 if (found && VOID_TYPE_P (TREE_TYPE (found)))
6586 error_with_decl (found, "parameter `%s' declared void");
6587 TREE_TYPE (found) = integer_type_node;
6588 DECL_ARG_TYPE (found) = integer_type_node;
6589 layout_decl (found, 0);
6592 /* Traditionally, a parm declared float is actually a double. */
6593 if (found && flag_traditional
6594 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6596 TREE_TYPE (found) = double_type_node;
6597 DECL_ARG_TYPE (found) = double_type_node;
6598 layout_decl (found, 0);
6601 /* If no declaration found, default to int. */
6604 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6606 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6607 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6608 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6609 error_with_decl (found, "type of parameter `%s' is not declared");
6613 TREE_PURPOSE (parm) = found;
6615 /* Mark this decl as "already found". */
6616 DECL_WEAK (found) = 1;
6619 /* Complain about any actual PARM_DECLs not matched with any names. */
6621 for (parm = parmdecls; parm;)
6623 tree next = TREE_CHAIN (parm);
6624 TREE_CHAIN (parm) = 0;
6626 /* Complain about args with incomplete types. */
6627 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6629 error_with_decl (parm, "parameter `%s' has incomplete type");
6630 TREE_TYPE (parm) = error_mark_node;
6633 if (! DECL_WEAK (parm))
6635 error_with_decl (parm,
6636 "declaration for parameter `%s' but no such parameter");
6637 /* Pretend the parameter was not missing.
6638 This gets us to a standard state and minimizes
6639 further error messages. */
6641 = chainon (specparms,
6642 tree_cons (parm, NULL_TREE, NULL_TREE));
6648 /* Chain the declarations together in the order of the list of names.
6649 At the same time, build up a list of their types, in reverse order. */
6655 for (last = 0; parm; parm = TREE_CHAIN (parm))
6656 if (TREE_PURPOSE (parm))
6659 parmdecls = TREE_PURPOSE (parm);
6661 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6662 last = TREE_PURPOSE (parm);
6663 TREE_CHAIN (last) = 0;
6665 types = tree_cons (NULL_TREE, TREE_TYPE (parm), types);
6670 return tree_cons (parmdecls, nonparms,
6671 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
6673 return tree_cons (parmdecls, nonparms, nreverse (types));
6676 /* Finish up a function declaration and compile that function
6677 all the way to assembler language output. The free the storage
6678 for the function definition.
6680 This is called after parsing the body of the function definition.
6682 NESTED is nonzero if the function being finished is nested in another. */
6685 finish_function (nested)
6688 register tree fndecl = current_function_decl;
6690 /* TREE_READONLY (fndecl) = 1;
6691 This caused &foo to be of type ptr-to-const-function
6692 which then got a warning when stored in a ptr-to-function variable. */
6695 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6697 /* Must mark the RESULT_DECL as being in this function. */
6699 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6701 /* Obey `register' declarations if `setjmp' is called in this fn. */
6702 if (flag_traditional && current_function_calls_setjmp)
6704 setjmp_protect (DECL_INITIAL (fndecl));
6705 setjmp_protect_args ();
6708 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6710 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6711 != integer_type_node)
6713 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6714 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6716 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
6720 #ifdef DEFAULT_MAIN_RETURN
6721 /* Make it so that `main' always returns success by default. */
6722 DEFAULT_MAIN_RETURN;
6725 c_expand_return (integer_zero_node);
6730 /* Tie off the statement tree for this function. */
6731 finish_stmt_tree (&DECL_SAVED_TREE (fndecl));
6732 /* Clear out memory we no longer need. */
6733 free_after_parsing (cfun);
6734 /* Since we never call rest_of_compilation, we never clear
6735 CFUN. Do so explicitly. */
6736 free_after_compilation (cfun);
6741 /* Generate RTL for the body of this function. */
6742 c_expand_body (fndecl, nested);
6743 /* Let the error reporting routines know that we're outside a
6744 function. For a nested function, this value is used in
6745 pop_c_function_context and then reset via pop_function_context. */
6746 current_function_decl = NULL;
6747 c_function_name_declared_p = 0;
6751 /* Generate the RTL for the body of FNDECL. If NESTED_P is non-zero,
6752 then we are already in the process of generating RTL for another
6756 c_expand_body (fndecl, nested_p)
6760 /* There's no reason to do any of the work here if we're only doing
6761 semantic analysis; this code just generates RTL. */
6762 if (flag_syntax_only)
6765 /* Squirrel away our current state. */
6767 push_function_context ();
6769 /* Initialize the RTL code for the function. */
6770 current_function_decl = fndecl;
6771 init_function_start (fndecl, input_filename, DECL_SOURCE_LINE (fndecl));
6773 /* This function is being processed in whole-function mode. */
6774 cfun->x_whole_function_mode_p = 1;
6776 /* Even though we're inside a function body, we still don't want to
6777 call expand_expr to calculate the size of a variable-sized array.
6778 We haven't necessarily assigned RTL to all variables yet, so it's
6779 not safe to try to expand expressions involving them. */
6780 immediate_size_expand = 0;
6781 cfun->x_dont_save_pending_sizes_p = 1;
6783 /* If this is a varargs function, inform function.c. */
6784 if (c_function_varargs)
6787 /* Set up parameters and prepare for return, for the function. */
6788 expand_function_start (fndecl, 0);
6790 /* If this function is `main', emit a call to `__main'
6791 to run global initializers, etc. */
6792 if (DECL_NAME (fndecl)
6793 && MAIN_NAME_P (DECL_NAME (fndecl))
6794 && DECL_CONTEXT (fndecl) == NULL_TREE)
6795 expand_main_function ();
6797 /* Generate the RTL for this function. */
6798 expand_stmt (DECL_SAVED_TREE (fndecl));
6799 /* Allow the body of the function to be garbage collected. */
6800 DECL_SAVED_TREE (fndecl) = NULL_TREE;
6802 /* We hard-wired immediate_size_expand to zero in start_function.
6803 expand_function_end will decrement this variable. So, we set the
6804 variable to one here, so that after the decrement it will remain
6806 immediate_size_expand = 1;
6808 /* Allow language dialects to perform special processing. */
6809 if (lang_expand_function_end)
6810 (*lang_expand_function_end) ();
6812 /* Generate rtl for function exit. */
6813 expand_function_end (input_filename, lineno, 0);
6815 /* If this is a nested function, protect the local variables in the stack
6816 above us from being collected while we're compiling this function. */
6818 ggc_push_context ();
6820 /* Run the optimizers and output the assembler code for this function. */
6821 rest_of_compilation (fndecl);
6823 /* Undo the GC context switch. */
6827 /* With just -W, complain only if function returns both with
6828 and without a value. */
6830 && current_function_returns_value
6831 && current_function_returns_null)
6832 warning ("this function may return with or without a value");
6834 /* If requested, warn about function definitions where the function will
6835 return a value (usually of some struct or union type) which itself will
6836 take up a lot of stack space. */
6838 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6840 tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6842 if (ret_type && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST
6843 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type),
6846 unsigned int size_as_int
6847 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type));
6849 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0)
6850 warning_with_decl (fndecl,
6851 "size of return value of `%s' is %u bytes",
6854 warning_with_decl (fndecl,
6855 "size of return value of `%s' is larger than %d bytes",
6860 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested_p)
6862 /* Stop pointing to the local nodes about to be freed.
6863 But DECL_INITIAL must remain nonzero so we know this
6864 was an actual function definition.
6865 For a nested function, this is done in pop_c_function_context.
6866 If rest_of_compilation set this to 0, leave it 0. */
6867 if (DECL_INITIAL (fndecl) != 0)
6868 DECL_INITIAL (fndecl) = error_mark_node;
6870 DECL_ARGUMENTS (fndecl) = 0;
6873 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6875 #ifndef ASM_OUTPUT_CONSTRUCTOR
6876 if (! flag_gnu_linker)
6877 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6880 assemble_constructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl)));
6883 if (DECL_STATIC_DESTRUCTOR (fndecl))
6885 #ifndef ASM_OUTPUT_DESTRUCTOR
6886 if (! flag_gnu_linker)
6887 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6890 assemble_destructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl)));
6895 /* Return to the enclosing function. */
6896 pop_function_context ();
6897 /* If the nested function was inline, write it out if that is
6899 if (!TREE_ASM_WRITTEN (fndecl) && TREE_ADDRESSABLE (fndecl))
6901 push_function_context ();
6902 output_inline_function (fndecl);
6903 pop_function_context ();
6909 /* Check the declarations given in a for-loop for satisfying the C99
6912 check_for_loop_decls ()
6918 /* If we get here, declarations have been used in a for loop without
6919 the C99 for loop scope. This doesn't make much sense, so don't
6921 error ("`for' loop initial declaration used outside C99 mode");
6924 /* C99 subclause 6.8.5 paragraph 3:
6926 [#3] The declaration part of a for statement shall only
6927 declare identifiers for objects having storage class auto or
6930 It isn't clear whether, in this sentence, "identifiers" binds to
6931 "shall only declare" or to "objects" - that is, whether all identifiers
6932 declared must be identifiers for objects, or whether the restriction
6933 only applies to those that are. (A question on this in comp.std.c
6934 in November 2000 received no answer.) We implement the strictest
6935 interpretation, to avoid creating an extension which later causes
6938 for (t = gettags (); t; t = TREE_CHAIN (t))
6940 if (TREE_PURPOSE (t) != 0)
6941 error ("`%s %s' declared in `for' loop initial declaration",
6942 (TREE_CODE (TREE_VALUE (t)) == RECORD_TYPE ? "struct"
6943 : TREE_CODE (TREE_VALUE (t)) == UNION_TYPE ? "union"
6945 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6947 for (t = getdecls (); t; t = TREE_CHAIN (t))
6949 if (TREE_CODE (t) != VAR_DECL && DECL_NAME (t))
6950 error_with_decl (t, "declaration of non-variable `%s' in `for' loop initial declaration");
6951 else if (TREE_STATIC (t))
6952 error_with_decl (t, "declaration of static variable `%s' in `for' loop initial declaration");
6953 else if (DECL_EXTERNAL (t))
6954 error_with_decl (t, "declaration of `extern' variable `%s' in `for' loop initial declaration");
6958 /* Save and restore the variables in this file and elsewhere
6959 that keep track of the progress of compilation of the current function.
6960 Used for nested functions. */
6962 struct c_language_function
6964 struct language_function base;
6966 tree shadowed_labels;
6969 int warn_about_return_type;
6971 struct binding_level *binding_level;
6974 /* Save and reinitialize the variables
6975 used during compilation of a C function. */
6978 push_c_function_context (f)
6981 struct c_language_function *p;
6982 p = ((struct c_language_function *)
6983 xmalloc (sizeof (struct c_language_function)));
6984 f->language = (struct language_function *) p;
6986 p->base.x_stmt_tree = c_stmt_tree;
6987 p->base.x_scope_stmt_stack = c_scope_stmt_stack;
6988 p->base.x_function_name_declared_p = c_function_name_declared_p;
6989 p->named_labels = named_labels;
6990 p->shadowed_labels = shadowed_labels;
6991 p->returns_value = current_function_returns_value;
6992 p->returns_null = current_function_returns_null;
6993 p->warn_about_return_type = warn_about_return_type;
6994 p->extern_inline = current_extern_inline;
6995 p->binding_level = current_binding_level;
6998 /* Restore the variables used during compilation of a C function. */
7001 pop_c_function_context (f)
7004 struct c_language_function *p
7005 = (struct c_language_function *) f->language;
7008 /* Bring back all the labels that were shadowed. */
7009 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
7010 if (DECL_NAME (TREE_VALUE (link)) != 0)
7011 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
7012 = TREE_VALUE (link);
7014 if (DECL_SAVED_INSNS (current_function_decl) == 0
7015 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
7017 /* Stop pointing to the local nodes about to be freed. */
7018 /* But DECL_INITIAL must remain nonzero so we know this
7019 was an actual function definition. */
7020 DECL_INITIAL (current_function_decl) = error_mark_node;
7021 DECL_ARGUMENTS (current_function_decl) = 0;
7024 c_stmt_tree = p->base.x_stmt_tree;
7025 c_scope_stmt_stack = p->base.x_scope_stmt_stack;
7026 c_function_name_declared_p = p->base.x_function_name_declared_p;
7027 named_labels = p->named_labels;
7028 shadowed_labels = p->shadowed_labels;
7029 current_function_returns_value = p->returns_value;
7030 current_function_returns_null = p->returns_null;
7031 warn_about_return_type = p->warn_about_return_type;
7032 current_extern_inline = p->extern_inline;
7033 current_binding_level = p->binding_level;
7039 /* Mark the language specific parts of F for GC. */
7042 mark_c_function_context (f)
7045 struct c_language_function *p
7046 = (struct c_language_function *) f->language;
7051 mark_c_language_function (&p->base);
7052 ggc_mark_tree (p->shadowed_labels);
7053 ggc_mark_tree (p->named_labels);
7054 mark_binding_level (&p->binding_level);
7057 /* Copy the DECL_LANG_SEPECIFIC data associated with NODE. */
7060 copy_lang_decl (decl)
7063 struct lang_decl *ld;
7065 if (!DECL_LANG_SPECIFIC (decl))
7068 ld = (struct lang_decl *) ggc_alloc (sizeof (struct lang_decl));
7069 memcpy ((char *) ld, (char *) DECL_LANG_SPECIFIC (decl),
7070 sizeof (struct lang_decl));
7071 DECL_LANG_SPECIFIC (decl) = ld;
7074 /* Mark the language specific bits in T for GC. */
7080 if (TREE_CODE (t) == IDENTIFIER_NODE)
7082 struct lang_identifier *i = (struct lang_identifier *) t;
7083 ggc_mark_tree (i->global_value);
7084 ggc_mark_tree (i->local_value);
7085 ggc_mark_tree (i->label_value);
7086 ggc_mark_tree (i->implicit_decl);
7087 ggc_mark_tree (i->error_locus);
7088 ggc_mark_tree (i->limbo_value);
7090 else if (TYPE_P (t) && TYPE_LANG_SPECIFIC (t))
7091 ggc_mark (TYPE_LANG_SPECIFIC (t));
7092 else if (DECL_P (t) && DECL_LANG_SPECIFIC (t))
7094 ggc_mark (DECL_LANG_SPECIFIC (t));
7095 c_mark_lang_decl (&DECL_LANG_SPECIFIC (t)->base);
7099 /* The functions below are required for functionality of doing
7100 function at once processing in the C front end. Currently these
7101 functions are not called from anywhere in the C front end, but as
7102 these changes continue, that will change. */
7104 /* Returns non-zero if the current statement is a full expression,
7105 i.e. temporaries created during that statement should be destroyed
7106 at the end of the statement. */
7109 stmts_are_full_exprs_p ()
7114 /* Returns the stmt_tree (if any) to which statements are currently
7115 being added. If there is no active statement-tree, NULL is
7119 current_stmt_tree ()
7121 return &c_stmt_tree;
7124 /* Returns the stack of SCOPE_STMTs for the current function. */
7127 current_scope_stmt_stack ()
7129 return &c_scope_stmt_stack;
7132 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
7136 anon_aggr_type_p (node)
7137 tree node ATTRIBUTE_UNUSED;
7142 /* Dummy function in place of callback used by C++. */
7145 extract_interface_info ()
7149 /* Return a new COMPOUND_STMT, after adding it to the current
7153 c_begin_compound_stmt ()
7157 /* Create the COMPOUND_STMT. */
7158 stmt = add_stmt (build_stmt (COMPOUND_STMT, NULL_TREE));
7159 /* If we haven't already declared __FUNCTION__ and its ilk then this
7160 is the opening curly brace of the function. Declare them now. */
7161 if (!c_function_name_declared_p)
7163 c_function_name_declared_p = 1;
7164 declare_function_name ();
7170 /* Expand T (a DECL_STMT) if it declares an entity not handled by the
7174 c_expand_decl_stmt (t)
7177 tree decl = DECL_STMT_DECL (t);
7179 /* Expand nested functions. */
7180 if (TREE_CODE (decl) == FUNCTION_DECL
7181 && DECL_CONTEXT (decl) == current_function_decl
7182 && DECL_SAVED_TREE (decl))
7183 c_expand_body (decl, /*nested_p=*/1);
7186 /* Return the IDENTIFIER_GLOBAL_VALUE of T, for use in common code, since
7187 the definition of IDENTIFIER_GLOBAL_VALUE is different for C and C++. */
7190 identifier_global_value (t)
7193 return IDENTIFIER_GLOBAL_VALUE (t);