1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001 Free Software Foundation, Inc.
5 This file is part of 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. */
45 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
47 { NORMAL, /* Ordinary declaration */
48 FUNCDEF, /* Function definition */
49 PARM, /* Declaration of parm before function body */
50 FIELD, /* Declaration inside struct or union */
51 BITFIELD, /* Likewise but with specified width */
52 TYPENAME}; /* Typename (inside cast or sizeof) */
55 /* Nonzero if we have seen an invalid cross reference
56 to a struct, union, or enum, but not yet printed the message. */
58 tree pending_invalid_xref;
59 /* File and line to appear in the eventual error message. */
60 const char *pending_invalid_xref_file;
61 int pending_invalid_xref_line;
63 /* While defining an enum type, this is 1 plus the last enumerator
64 constant value. Note that will do not have to save this or `enum_overflow'
65 around nested function definition since such a definition could only
66 occur in an enum value expression and we don't use these variables in
69 static tree enum_next_value;
71 /* Nonzero means that there was overflow computing enum_next_value. */
73 static int enum_overflow;
75 /* Parsing a function declarator leaves a list of parameter names
76 or a chain or parameter decls here. */
78 static tree last_function_parms;
80 /* Parsing a function declarator leaves here a chain of structure
81 and enum types declared in the parmlist. */
83 static tree last_function_parm_tags;
85 /* After parsing the declarator that starts a function definition,
86 `start_function' puts here the list of parameter names or chain of decls.
87 `store_parm_decls' finds it here. */
89 static tree current_function_parms;
91 /* Similar, for last_function_parm_tags. */
92 static tree current_function_parm_tags;
94 /* Similar, for the file and line that the prototype came from if this is
95 an old-style definition. */
96 static const char *current_function_prototype_file;
97 static int current_function_prototype_line;
99 /* The current statement tree. */
101 static struct stmt_tree_s c_stmt_tree;
103 /* The current scope statement stack. */
105 static tree c_scope_stmt_stack;
107 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
108 that have names. Here so we can clear out their names' definitions
109 at the end of the function. */
111 static tree named_labels;
113 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
115 static tree shadowed_labels;
117 /* Nonzero when store_parm_decls is called indicates a varargs function.
118 Value not meaningful after store_parm_decls. */
120 static int c_function_varargs;
122 /* Set to 0 at beginning of a function definition, set to 1 if
123 a return statement that specifies a return value is seen. */
125 int current_function_returns_value;
127 /* Set to 0 at beginning of a function definition, set to 1 if
128 a return statement with no argument is seen. */
130 int current_function_returns_null;
132 /* Set to nonzero by `grokdeclarator' for a function
133 whose return type is defaulted, if warnings for this are desired. */
135 static int warn_about_return_type;
137 /* Nonzero when starting a function declared `extern inline'. */
139 static int current_extern_inline;
141 /* For each binding contour we allocate a binding_level structure
142 * which records the names defined in that contour.
145 * 1) one for each function definition,
146 * where internal declarations of the parameters appear.
147 * 2) one for each compound statement,
148 * to record its declarations.
150 * The current meaning of a name can be found by searching the levels from
151 * the current one out to the global one.
154 /* Note that the information in the `names' component of the global contour
155 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
159 /* A chain of _DECL nodes for all variables, constants, functions,
160 and typedef types. These are in the reverse of the order supplied.
164 /* A list of structure, union and enum definitions,
165 * for looking up tag names.
166 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
167 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
168 * or ENUMERAL_TYPE node.
172 /* For each level, a list of shadowed outer-level local definitions
173 to be restored when this level is popped.
174 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
175 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
178 /* For each level (except not the global one),
179 a chain of BLOCK nodes for all the levels
180 that were entered and exited one level down. */
183 /* The BLOCK node for this level, if one has been preallocated.
184 If 0, the BLOCK is allocated (if needed) when the level is popped. */
187 /* The binding level which this one is contained in (inherits from). */
188 struct binding_level *level_chain;
190 /* Nonzero for the level that holds the parameters of a function. */
193 /* Nonzero if this level "doesn't exist" for tags. */
194 char tag_transparent;
196 /* Nonzero if sublevels of this level "don't exist" for tags.
197 This is set in the parm level of a function definition
198 while reading the function body, so that the outermost block
199 of the function body will be tag-transparent. */
200 char subblocks_tag_transparent;
202 /* Nonzero means make a BLOCK for this level regardless of all else. */
205 /* Nonzero means make a BLOCK if this level has any subblocks. */
206 char keep_if_subblocks;
208 /* Number of decls in `names' that have incomplete
209 structure or union types. */
212 /* A list of decls giving the (reversed) specified order of parms,
213 not including any forward-decls in the parmlist.
214 This is so we can put the parms in proper order for assign_parms. */
218 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
220 /* The binding level currently in effect. */
222 static struct binding_level *current_binding_level;
224 /* A chain of binding_level structures awaiting reuse. */
226 static struct binding_level *free_binding_level;
228 /* The outermost binding level, for names of file scope.
229 This is created when the compiler is started and exists
230 through the entire run. */
232 static struct binding_level *global_binding_level;
234 /* Binding level structures are initialized by copying this one. */
236 static struct binding_level clear_binding_level
237 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, 0,
240 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
242 static int keep_next_level_flag;
244 /* Nonzero means make a BLOCK for the next level pushed
245 if it has subblocks. */
247 static int keep_next_if_subblocks;
249 /* The chain of outer levels of label scopes.
250 This uses the same data structure used for binding levels,
251 but it works differently: each link in the chain records
252 saved values of named_labels and shadowed_labels for
253 a label binding level outside the current one. */
255 static struct binding_level *label_level_chain;
257 /* Functions called automatically at the beginning and end of execution. */
259 tree static_ctors, static_dtors;
261 /* Forward declarations. */
263 static struct binding_level * make_binding_level PARAMS ((void));
264 static void mark_binding_level PARAMS ((void *));
265 static void clear_limbo_values PARAMS ((tree));
266 static int duplicate_decls PARAMS ((tree, tree, int));
267 static int redeclaration_error_message PARAMS ((tree, tree));
268 static void storedecls PARAMS ((tree));
269 static void storetags PARAMS ((tree));
270 static tree lookup_tag PARAMS ((enum tree_code, tree,
271 struct binding_level *, int));
272 static tree lookup_tag_reverse PARAMS ((tree));
273 static tree grokdeclarator PARAMS ((tree, tree, enum decl_context,
275 static tree grokparms PARAMS ((tree, int));
276 static void layout_array_type PARAMS ((tree));
277 static tree c_make_fname_decl PARAMS ((tree, int));
278 static void c_expand_body PARAMS ((tree, int));
280 /* C-specific option variables. */
282 /* Nonzero means allow type mismatches in conditional expressions;
283 just make their values `void'. */
285 int flag_cond_mismatch;
287 /* Nonzero means don't recognize the keyword `asm'. */
291 /* Nonzero means do some things the same way PCC does. */
293 int flag_traditional;
295 /* Nonzero means enable C89 Amendment 1 features. */
299 /* Nonzero means use the ISO C99 dialect of C. */
303 /* Nonzero means that we have builtin functions, and main is an int */
307 /* Nonzero means add default format_arg attributes for functions not
310 int flag_noniso_default_format_attributes = 1;
312 /* Nonzero means to allow single precision math even if we're generally
313 being traditional. */
314 int flag_allow_single_precision = 0;
316 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
318 int flag_signed_bitfields = 1;
319 int explicit_flag_signed_bitfields = 0;
321 /* Nonzero means warn about use of implicit int. */
323 int warn_implicit_int;
325 /* Nonzero means warn about usage of long long when `-pedantic'. */
327 int warn_long_long = 1;
329 /* Nonzero means message about use of implicit function declarations;
330 1 means warning; 2 means error. */
332 int mesg_implicit_function_declaration = -1;
334 /* Nonzero means give string constants the type `const char *'
335 to get extra warnings from them. These warnings will be too numerous
336 to be useful, except in thoroughly ANSIfied programs. */
338 int flag_const_strings;
340 /* Nonzero means warn about pointer casts that can drop a type qualifier
341 from the pointer target type. */
345 /* Nonzero means warn when casting a function call to a type that does
346 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
347 when there is no previous declaration of sqrt or malloc. */
349 int warn_bad_function_cast;
351 /* Warn about functions which might be candidates for format attributes. */
353 int warn_missing_format_attribute;
355 /* Warn about traditional constructs whose meanings changed in ANSI C. */
357 int warn_traditional;
359 /* Nonzero means warn about sizeof(function) or addition/subtraction
360 of function pointers. */
362 int warn_pointer_arith;
364 /* Nonzero means warn for non-prototype function decls
365 or non-prototyped defs without previous prototype. */
367 int warn_strict_prototypes;
369 /* Nonzero means warn for any global function def
370 without separate previous prototype decl. */
372 int warn_missing_prototypes;
374 /* Nonzero means warn for any global function def
375 without separate previous decl. */
377 int warn_missing_declarations;
379 /* Nonzero means warn about multiple (redundant) decls for the same single
380 variable or function. */
382 int warn_redundant_decls = 0;
384 /* Nonzero means warn about extern declarations of objects not at
385 file-scope level and about *all* declarations of functions (whether
386 extern or static) not at file-scope level. Note that we exclude
387 implicit function declarations. To get warnings about those, use
390 int warn_nested_externs = 0;
392 /* Warn about a subscript that has type char. */
394 int warn_char_subscripts = 0;
396 /* Warn if a type conversion is done that might have confusing results. */
400 /* Warn if adding () is suggested. */
402 int warn_parentheses;
404 /* Warn if initializer is not completely bracketed. */
406 int warn_missing_braces;
408 /* Warn if main is suspicious. */
412 /* Warn about #pragma directives that are not recognised. */
414 int warn_unknown_pragmas = 0; /* Tri state variable. */
416 /* Warn about comparison of signed and unsigned values.
417 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
419 int warn_sign_compare = -1;
421 /* Warn about testing equality of floating point numbers. */
423 int warn_float_equal = 0;
425 /* Nonzero means warn about use of multicharacter literals. */
427 int warn_multichar = 1;
429 /* The variant of the C language being processed. */
431 c_language_kind c_language = clk_c;
433 /* Nonzero means `$' can be in an identifier. */
435 #ifndef DOLLARS_IN_IDENTIFIERS
436 #define DOLLARS_IN_IDENTIFIERS 1
438 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
440 /* Decode the string P as a language-specific option for C.
441 Return the number of strings consumed. Should not complain
442 if it does not recognise the option. */
445 c_decode_option (argc, argv)
446 int argc ATTRIBUTE_UNUSED;
449 int strings_processed;
450 const char *option_value = NULL;
453 strings_processed = cpp_handle_option (parse_in, argc, argv);
455 if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
457 flag_traditional = 1;
458 flag_writable_strings = 1;
460 else if (!strcmp (p, "-fallow-single-precision"))
461 flag_allow_single_precision = 1;
462 else if (!strcmp (p, "-fhosted") || !strcmp (p, "-fno-freestanding"))
467 else if (!strcmp (p, "-ffreestanding") || !strcmp (p, "-fno-hosted"))
471 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
475 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
477 flag_traditional = 0;
478 flag_writable_strings = 0;
480 else if (!strncmp (p, "-std=", 5))
482 /* Select the appropriate language standard. We currently
484 -std=iso9899:1990 same as -ansi
485 -std=iso9899:199409 ISO C as modified in amend. 1
486 -std=iso9899:1999 ISO C 99
487 -std=c89 same as -std=iso9899:1990
488 -std=c99 same as -std=iso9899:1999
489 -std=gnu89 default, iso9899:1990 + gnu extensions
490 -std=gnu99 iso9899:1999 + gnu extensions
492 const char *argstart = &p[5];
494 if (!strcmp (argstart, "iso9899:1990")
495 || !strcmp (argstart, "c89"))
500 flag_traditional = 0;
501 flag_writable_strings = 0;
503 flag_no_nonansi_builtin = 1;
504 flag_noniso_default_format_attributes = 0;
507 else if (!strcmp (argstart, "iso9899:199409"))
512 else if (!strcmp (argstart, "iso9899:199x")
513 || !strcmp (argstart, "iso9899:1999")
514 || !strcmp (argstart, "c9x")
515 || !strcmp (argstart, "c99"))
517 flag_traditional = 0;
518 flag_writable_strings = 0;
520 flag_no_nonansi_builtin = 1;
521 flag_noniso_default_format_attributes = 0;
525 else if (!strcmp (argstart, "gnu89"))
527 flag_traditional = 0;
528 flag_writable_strings = 0;
530 flag_no_nonansi_builtin = 0;
531 flag_noniso_default_format_attributes = 1;
535 else if (!strcmp (argstart, "gnu9x") || !strcmp (argstart, "gnu99"))
537 flag_traditional = 0;
538 flag_writable_strings = 0;
540 flag_no_nonansi_builtin = 0;
541 flag_noniso_default_format_attributes = 1;
546 error ("unknown C standard `%s'", argstart);
548 else if (!strcmp (p, "-fdollars-in-identifiers"))
549 dollars_in_ident = 1;
550 else if (!strcmp (p, "-fno-dollars-in-identifiers"))
551 dollars_in_ident = 0;
552 else if (!strcmp (p, "-fsigned-char"))
553 flag_signed_char = 1;
554 else if (!strcmp (p, "-funsigned-char"))
555 flag_signed_char = 0;
556 else if (!strcmp (p, "-fno-signed-char"))
557 flag_signed_char = 0;
558 else if (!strcmp (p, "-fno-unsigned-char"))
559 flag_signed_char = 1;
560 else if (!strcmp (p, "-fsigned-bitfields")
561 || !strcmp (p, "-fno-unsigned-bitfields"))
563 flag_signed_bitfields = 1;
564 explicit_flag_signed_bitfields = 1;
566 else if (!strcmp (p, "-funsigned-bitfields")
567 || !strcmp (p, "-fno-signed-bitfields"))
569 flag_signed_bitfields = 0;
570 explicit_flag_signed_bitfields = 1;
572 else if (!strcmp (p, "-fshort-enums"))
573 flag_short_enums = 1;
574 else if (!strcmp (p, "-fno-short-enums"))
575 flag_short_enums = 0;
576 else if (!strcmp (p, "-fshort-wchar"))
577 flag_short_wchar = 1;
578 else if (!strcmp (p, "-fno-short-wchar"))
579 flag_short_wchar = 0;
580 else if (!strcmp (p, "-fcond-mismatch"))
581 flag_cond_mismatch = 1;
582 else if (!strcmp (p, "-fno-cond-mismatch"))
583 flag_cond_mismatch = 0;
584 else if (!strcmp (p, "-fshort-double"))
585 flag_short_double = 1;
586 else if (!strcmp (p, "-fno-short-double"))
587 flag_short_double = 0;
588 else if (!strcmp (p, "-fasm"))
590 else if (!strcmp (p, "-fno-asm"))
592 else if (!strcmp (p, "-fbuiltin"))
594 else if (!strcmp (p, "-fno-builtin"))
596 else if ((option_value
597 = skip_leading_substring (p, "-fdump-translation-unit-")))
600 error ("no file specified with -fdump-translation-unit");
602 flag_dump_translation_unit = option_value;
604 else if (!strcmp (p, "-ansi"))
606 else if (!strcmp (p, "-Werror-implicit-function-declaration"))
607 mesg_implicit_function_declaration = 2;
608 else if (!strcmp (p, "-Wimplicit-function-declaration"))
609 mesg_implicit_function_declaration = 1;
610 else if (!strcmp (p, "-Wno-implicit-function-declaration"))
611 mesg_implicit_function_declaration = 0;
612 else if (!strcmp (p, "-Wimplicit-int"))
613 warn_implicit_int = 1;
614 else if (!strcmp (p, "-Wno-implicit-int"))
615 warn_implicit_int = 0;
616 else if (!strcmp (p, "-Wimplicit"))
618 warn_implicit_int = 1;
619 if (mesg_implicit_function_declaration != 2)
620 mesg_implicit_function_declaration = 1;
622 else if (!strcmp (p, "-Wno-implicit"))
623 warn_implicit_int = 0, mesg_implicit_function_declaration = 0;
624 else if (!strcmp (p, "-Wlong-long"))
626 else if (!strcmp (p, "-Wno-long-long"))
628 else if (!strcmp (p, "-Wwrite-strings"))
629 flag_const_strings = 1;
630 else if (!strcmp (p, "-Wno-write-strings"))
631 flag_const_strings = 0;
632 else if (!strcmp (p, "-Wcast-qual"))
634 else if (!strcmp (p, "-Wno-cast-qual"))
636 else if (!strcmp (p, "-Wbad-function-cast"))
637 warn_bad_function_cast = 1;
638 else if (!strcmp (p, "-Wno-bad-function-cast"))
639 warn_bad_function_cast = 0;
640 else if (!strcmp (p, "-Wno-missing-noreturn"))
641 warn_missing_noreturn = 0;
642 else if (!strcmp (p, "-Wmissing-format-attribute"))
643 warn_missing_format_attribute = 1;
644 else if (!strcmp (p, "-Wno-missing-format-attribute"))
645 warn_missing_format_attribute = 0;
646 else if (!strcmp (p, "-Wpointer-arith"))
647 warn_pointer_arith = 1;
648 else if (!strcmp (p, "-Wno-pointer-arith"))
649 warn_pointer_arith = 0;
650 else if (!strcmp (p, "-Wstrict-prototypes"))
651 warn_strict_prototypes = 1;
652 else if (!strcmp (p, "-Wno-strict-prototypes"))
653 warn_strict_prototypes = 0;
654 else if (!strcmp (p, "-Wmissing-prototypes"))
655 warn_missing_prototypes = 1;
656 else if (!strcmp (p, "-Wno-missing-prototypes"))
657 warn_missing_prototypes = 0;
658 else if (!strcmp (p, "-Wmissing-declarations"))
659 warn_missing_declarations = 1;
660 else if (!strcmp (p, "-Wno-missing-declarations"))
661 warn_missing_declarations = 0;
662 else if (!strcmp (p, "-Wredundant-decls"))
663 warn_redundant_decls = 1;
664 else if (!strcmp (p, "-Wno-redundant-decls"))
665 warn_redundant_decls = 0;
666 else if (!strcmp (p, "-Wnested-externs"))
667 warn_nested_externs = 1;
668 else if (!strcmp (p, "-Wno-nested-externs"))
669 warn_nested_externs = 0;
670 else if (!strcmp (p, "-Wtraditional"))
671 warn_traditional = 1;
672 else if (!strcmp (p, "-Wno-traditional"))
673 warn_traditional = 0;
674 else if (!strncmp (p, "-Wformat=", 9))
675 set_Wformat (atoi (p + 9));
676 else if (!strcmp (p, "-Wformat"))
678 else if (!strcmp (p, "-Wno-format"))
680 else if (!strcmp (p, "-Wformat-y2k"))
682 else if (!strcmp (p, "-Wno-format-y2k"))
684 else if (!strcmp (p, "-Wformat-extra-args"))
685 warn_format_extra_args = 1;
686 else if (!strcmp (p, "-Wno-format-extra-args"))
687 warn_format_extra_args = 0;
688 else if (!strcmp (p, "-Wformat-nonliteral"))
689 warn_format_nonliteral = 1;
690 else if (!strcmp (p, "-Wno-format-nonliteral"))
691 warn_format_nonliteral = 0;
692 else if (!strcmp (p, "-Wformat-security"))
693 warn_format_security = 1;
694 else if (!strcmp (p, "-Wno-format-security"))
695 warn_format_security = 0;
696 else if (!strcmp (p, "-Wchar-subscripts"))
697 warn_char_subscripts = 1;
698 else if (!strcmp (p, "-Wno-char-subscripts"))
699 warn_char_subscripts = 0;
700 else if (!strcmp (p, "-Wconversion"))
702 else if (!strcmp (p, "-Wno-conversion"))
704 else if (!strcmp (p, "-Wparentheses"))
705 warn_parentheses = 1;
706 else if (!strcmp (p, "-Wno-parentheses"))
707 warn_parentheses = 0;
708 else if (!strcmp (p, "-Wreturn-type"))
709 warn_return_type = 1;
710 else if (!strcmp (p, "-Wno-return-type"))
711 warn_return_type = 0;
712 else if (!strcmp (p, "-Wsequence-point"))
713 warn_sequence_point = 1;
714 else if (!strcmp (p, "-Wno-sequence-point"))
715 warn_sequence_point = 0;
716 else if (!strcmp (p, "-Wcomment"))
717 ; /* cpp handles this one. */
718 else if (!strcmp (p, "-Wno-comment"))
719 ; /* cpp handles this one. */
720 else if (!strcmp (p, "-Wcomments"))
721 ; /* cpp handles this one. */
722 else if (!strcmp (p, "-Wno-comments"))
723 ; /* cpp handles this one. */
724 else if (!strcmp (p, "-Wtrigraphs"))
725 ; /* cpp handles this one. */
726 else if (!strcmp (p, "-Wno-trigraphs"))
727 ; /* cpp handles this one. */
728 else if (!strcmp (p, "-Wundef"))
729 ; /* cpp handles this one. */
730 else if (!strcmp (p, "-Wno-undef"))
731 ; /* cpp handles this one. */
732 else if (!strcmp (p, "-Wimport"))
733 ; /* cpp handles this one. */
734 else if (!strcmp (p, "-Wno-import"))
735 ; /* cpp handles this one. */
736 else if (!strcmp (p, "-Wmissing-braces"))
737 warn_missing_braces = 1;
738 else if (!strcmp (p, "-Wno-missing-braces"))
739 warn_missing_braces = 0;
740 else if (!strcmp (p, "-Wmain"))
742 else if (!strcmp (p, "-Wno-main"))
744 else if (!strcmp (p, "-Wsign-compare"))
745 warn_sign_compare = 1;
746 else if (!strcmp (p, "-Wno-sign-compare"))
747 warn_sign_compare = 0;
748 else if (!strcmp (p, "-Wfloat-equal"))
749 warn_float_equal = 1;
750 else if (!strcmp (p, "-Wno-float-equal"))
751 warn_float_equal = 0;
752 else if (!strcmp (p, "-Wmultichar"))
754 else if (!strcmp (p, "-Wno-multichar"))
756 else if (!strcmp (p, "-Wunknown-pragmas"))
757 /* Set to greater than 1, so that even unknown pragmas in system
758 headers will be warned about. */
759 warn_unknown_pragmas = 2;
760 else if (!strcmp (p, "-Wno-unknown-pragmas"))
761 warn_unknown_pragmas = 0;
762 else if (!strcmp (p, "-Wall"))
764 /* We save the value of warn_uninitialized, since if they put
765 -Wuninitialized on the command line, we need to generate a
766 warning about not using it without also specifying -O. */
767 if (warn_uninitialized != 1)
768 warn_uninitialized = 2;
769 warn_implicit_int = 1;
770 mesg_implicit_function_declaration = 1;
771 warn_return_type = 1;
775 warn_char_subscripts = 1;
776 warn_parentheses = 1;
777 warn_sequence_point = 1;
778 warn_missing_braces = 1;
779 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
780 it off only if it's not explicit. */
782 /* Only warn about unknown pragmas that are not in system headers. */
783 warn_unknown_pragmas = 1;
786 return strings_processed;
791 /* Hooks for print_node. */
794 print_lang_decl (file, node, indent)
795 FILE *file ATTRIBUTE_UNUSED;
796 tree node ATTRIBUTE_UNUSED;
797 int indent ATTRIBUTE_UNUSED;
802 print_lang_type (file, node, indent)
803 FILE *file ATTRIBUTE_UNUSED;
804 tree node ATTRIBUTE_UNUSED;
805 int indent ATTRIBUTE_UNUSED;
810 print_lang_identifier (file, node, indent)
815 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
816 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
817 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
818 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
819 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
820 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
821 if (C_IS_RESERVED_WORD (node))
823 tree rid = ridpointers[C_RID_CODE (node)];
824 indent_to (file, indent + 4);
825 fprintf (file, "rid ");
826 fprintf (file, HOST_PTR_PRINTF, (void *)rid);
827 fprintf (file, " \"%s\"", IDENTIFIER_POINTER (rid));
831 /* Hook called at end of compilation to assume 1 elt
832 for a top-level tentative array defn that wasn't complete before. */
835 finish_incomplete_decl (decl)
838 if (TREE_CODE (decl) == VAR_DECL)
840 tree type = TREE_TYPE (decl);
841 if (type != error_mark_node
842 && TREE_CODE (type) == ARRAY_TYPE
843 && ! DECL_EXTERNAL (decl)
844 && TYPE_DOMAIN (type) == 0)
846 warning_with_decl (decl, "array `%s' assumed to have one element");
848 complete_array_type (type, NULL_TREE, 1);
850 layout_decl (decl, 0);
855 /* Create a new `struct binding_level'. */
857 static struct binding_level *
858 make_binding_level ()
861 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
864 /* Nonzero if we are currently in the global binding level. */
869 return current_binding_level == global_binding_level;
875 keep_next_level_flag = 1;
878 /* Nonzero if the current level needs to have a BLOCK made. */
883 return ((current_binding_level->keep_if_subblocks
884 && current_binding_level->blocks != 0)
885 || current_binding_level->keep
886 || current_binding_level->names != 0
887 || (current_binding_level->tags != 0
888 && !current_binding_level->tag_transparent));
891 /* Identify this binding level as a level of parameters.
892 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
893 But it turns out there is no way to pass the right value for
894 DEFINITION_FLAG, so we ignore it. */
897 declare_parm_level (definition_flag)
898 int definition_flag ATTRIBUTE_UNUSED;
900 current_binding_level->parm_flag = 1;
903 /* Nonzero if currently making parm declarations. */
908 return current_binding_level->parm_flag;
911 /* Enter a new binding level.
912 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
913 not for that of tags. */
916 pushlevel (tag_transparent)
919 register struct binding_level *newlevel = NULL_BINDING_LEVEL;
921 /* If this is the top level of a function,
922 just make sure that NAMED_LABELS is 0. */
924 if (current_binding_level == global_binding_level)
929 /* Reuse or create a struct for this binding level. */
931 if (free_binding_level)
933 newlevel = free_binding_level;
934 free_binding_level = free_binding_level->level_chain;
938 newlevel = make_binding_level ();
941 /* Add this level to the front of the chain (stack) of levels that
944 *newlevel = clear_binding_level;
945 newlevel->tag_transparent
947 || (current_binding_level
948 ? current_binding_level->subblocks_tag_transparent
950 newlevel->level_chain = current_binding_level;
951 current_binding_level = newlevel;
952 newlevel->keep = keep_next_level_flag;
953 keep_next_level_flag = 0;
954 newlevel->keep_if_subblocks = keep_next_if_subblocks;
955 keep_next_if_subblocks = 0;
958 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
961 clear_limbo_values (block)
966 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
967 if (DECL_NAME (tem) != 0)
968 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
970 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
971 clear_limbo_values (tem);
974 /* Exit a binding level.
975 Pop the level off, and restore the state of the identifier-decl mappings
976 that were in effect when this level was entered.
978 If KEEP is nonzero, this level had explicit declarations, so
979 and create a "block" (a BLOCK node) for the level
980 to record its declarations and subblocks for symbol table output.
982 If FUNCTIONBODY is nonzero, this level is the body of a function,
983 so create a block as if KEEP were set and also clear out all
986 If REVERSE is nonzero, reverse the order of decls before putting
987 them into the BLOCK. */
990 poplevel (keep, reverse, functionbody)
996 /* The chain of decls was accumulated in reverse order.
997 Put it into forward order, just for cleanliness. */
999 tree tags = current_binding_level->tags;
1000 tree subblocks = current_binding_level->blocks;
1003 int block_previously_created;
1005 keep |= current_binding_level->keep;
1007 /* This warning is turned off because it causes warnings for
1008 declarations like `extern struct foo *x'. */
1010 /* Warn about incomplete structure types in this level. */
1011 for (link = tags; link; link = TREE_CHAIN (link))
1012 if (!COMPLETE_TYPE_P (TREE_VALUE (link)))
1014 tree type = TREE_VALUE (link);
1015 tree type_name = TYPE_NAME (type);
1016 char *id = IDENTIFIER_POINTER (TREE_CODE (type_name) == IDENTIFIER_NODE
1018 : DECL_NAME (type_name));
1019 switch (TREE_CODE (type))
1022 error ("`struct %s' incomplete in scope ending here", id);
1025 error ("`union %s' incomplete in scope ending here", id);
1028 error ("`enum %s' incomplete in scope ending here", id);
1034 /* Get the decls in the order they were written.
1035 Usually current_binding_level->names is in reverse order.
1036 But parameter decls were previously put in forward order. */
1039 current_binding_level->names
1040 = decls = nreverse (current_binding_level->names);
1042 decls = current_binding_level->names;
1044 /* Output any nested inline functions within this block
1045 if they weren't already output. */
1047 for (decl = decls; decl; decl = TREE_CHAIN (decl))
1048 if (TREE_CODE (decl) == FUNCTION_DECL
1049 && ! TREE_ASM_WRITTEN (decl)
1050 && DECL_INITIAL (decl) != 0
1051 && TREE_ADDRESSABLE (decl))
1053 /* If this decl was copied from a file-scope decl
1054 on account of a block-scope extern decl,
1055 propagate TREE_ADDRESSABLE to the file-scope decl.
1057 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1058 true, since then the decl goes through save_for_inline_copying. */
1059 if (DECL_ABSTRACT_ORIGIN (decl) != 0
1060 && DECL_ABSTRACT_ORIGIN (decl) != decl)
1061 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
1064 /* We used to warn about unused variables in expand_end_bindings,
1065 i.e. while generating RTL. But in function-at-a-time mode we may
1066 choose to never expand a function at all (e.g. auto inlining), so
1067 we do this explicitly now. */
1068 warn_about_unused_variables (getdecls ());
1070 /* If there were any declarations or structure tags in that level,
1071 or if this level is a function body,
1072 create a BLOCK to record them for the life of this function. */
1075 block_previously_created = (current_binding_level->this_block != 0);
1076 if (block_previously_created)
1077 block = current_binding_level->this_block;
1078 else if (keep || functionbody
1079 || (current_binding_level->keep_if_subblocks && subblocks != 0))
1080 block = make_node (BLOCK);
1083 BLOCK_VARS (block) = decls;
1084 BLOCK_SUBBLOCKS (block) = subblocks;
1087 /* In each subblock, record that this is its superior. */
1089 for (link = subblocks; link; link = TREE_CHAIN (link))
1090 BLOCK_SUPERCONTEXT (link) = block;
1092 /* Clear out the meanings of the local variables of this level. */
1094 for (link = decls; link; link = TREE_CHAIN (link))
1096 if (DECL_NAME (link) != 0)
1098 /* If the ident. was used or addressed via a local extern decl,
1099 don't forget that fact. */
1100 if (DECL_EXTERNAL (link))
1102 if (TREE_USED (link))
1103 TREE_USED (DECL_NAME (link)) = 1;
1104 if (TREE_ADDRESSABLE (link))
1105 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1107 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1111 /* Restore all name-meanings of the outer levels
1112 that were shadowed by this level. */
1114 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1115 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1117 /* If the level being exited is the top level of a function,
1118 check over all the labels, and clear out the current
1119 (function local) meanings of their names. */
1123 clear_limbo_values (block);
1125 /* If this is the top level block of a function,
1126 the vars are the function's parameters.
1127 Don't leave them in the BLOCK because they are
1128 found in the FUNCTION_DECL instead. */
1130 BLOCK_VARS (block) = 0;
1132 /* Clear out the definitions of all label names,
1133 since their scopes end here,
1134 and add them to BLOCK_VARS. */
1136 for (link = named_labels; link; link = TREE_CHAIN (link))
1138 register tree label = TREE_VALUE (link);
1140 if (DECL_INITIAL (label) == 0)
1142 error_with_decl (label, "label `%s' used but not defined");
1143 /* Avoid crashing later. */
1144 define_label (input_filename, lineno,
1147 else if (warn_unused_label && !TREE_USED (label))
1148 warning_with_decl (label, "label `%s' defined but not used");
1149 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1151 /* Put the labels into the "variables" of the
1152 top-level block, so debugger can see them. */
1153 TREE_CHAIN (label) = BLOCK_VARS (block);
1154 BLOCK_VARS (block) = label;
1158 /* Pop the current level, and free the structure for reuse. */
1161 register struct binding_level *level = current_binding_level;
1162 current_binding_level = current_binding_level->level_chain;
1164 level->level_chain = free_binding_level;
1165 free_binding_level = level;
1168 /* Dispose of the block that we just made inside some higher level. */
1170 DECL_INITIAL (current_function_decl) = block;
1173 if (!block_previously_created)
1174 current_binding_level->blocks
1175 = chainon (current_binding_level->blocks, block);
1177 /* If we did not make a block for the level just exited,
1178 any blocks made for inner levels
1179 (since they cannot be recorded as subblocks in that level)
1180 must be carried forward so they will later become subblocks
1181 of something else. */
1183 current_binding_level->blocks
1184 = chainon (current_binding_level->blocks, subblocks);
1186 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1187 binding contour so that they point to the appropriate construct, i.e.
1188 either to the current FUNCTION_DECL node, or else to the BLOCK node
1189 we just constructed.
1191 Note that for tagged types whose scope is just the formal parameter
1192 list for some function type specification, we can't properly set
1193 their TYPE_CONTEXTs here, because we don't have a pointer to the
1194 appropriate FUNCTION_TYPE node readily available to us. For those
1195 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1196 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1197 node which will represent the "scope" for these "parameter list local"
1201 for (link = tags; link; link = TREE_CHAIN (link))
1202 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1204 for (link = tags; link; link = TREE_CHAIN (link))
1205 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1208 TREE_USED (block) = 1;
1213 /* Delete the node BLOCK from the current binding level.
1214 This is used for the block inside a stmt expr ({...})
1215 so that the block can be reinserted where appropriate. */
1218 delete_block (block)
1222 if (current_binding_level->blocks == block)
1223 current_binding_level->blocks = TREE_CHAIN (block);
1224 for (t = current_binding_level->blocks; t;)
1226 if (TREE_CHAIN (t) == block)
1227 TREE_CHAIN (t) = TREE_CHAIN (block);
1231 TREE_CHAIN (block) = NULL;
1232 /* Clear TREE_USED which is always set by poplevel.
1233 The flag is set again if insert_block is called. */
1234 TREE_USED (block) = 0;
1237 /* Insert BLOCK at the end of the list of subblocks of the
1238 current binding level. This is used when a BIND_EXPR is expanded,
1239 to handle the BLOCK node inside the BIND_EXPR. */
1242 insert_block (block)
1245 TREE_USED (block) = 1;
1246 current_binding_level->blocks
1247 = chainon (current_binding_level->blocks, block);
1250 /* Set the BLOCK node for the innermost scope
1251 (the one we are currently in). */
1255 register tree block;
1257 current_binding_level->this_block = block;
1258 current_binding_level->names = chainon (current_binding_level->names,
1259 BLOCK_VARS (block));
1260 current_binding_level->blocks = chainon (current_binding_level->blocks,
1261 BLOCK_SUBBLOCKS (block));
1267 register struct binding_level *newlevel;
1269 /* Reuse or create a struct for this binding level. */
1271 if (free_binding_level)
1273 newlevel = free_binding_level;
1274 free_binding_level = free_binding_level->level_chain;
1278 newlevel = make_binding_level ();
1281 /* Add this level to the front of the chain (stack) of label levels. */
1283 newlevel->level_chain = label_level_chain;
1284 label_level_chain = newlevel;
1286 newlevel->names = named_labels;
1287 newlevel->shadowed = shadowed_labels;
1289 shadowed_labels = 0;
1295 register struct binding_level *level = label_level_chain;
1298 /* Clear out the definitions of the declared labels in this level.
1299 Leave in the list any ordinary, non-declared labels. */
1300 for (link = named_labels, prev = 0; link;)
1302 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1304 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1306 error_with_decl (TREE_VALUE (link),
1307 "label `%s' used but not defined");
1308 /* Avoid crashing later. */
1309 define_label (input_filename, lineno,
1310 DECL_NAME (TREE_VALUE (link)));
1312 else if (warn_unused_label && !TREE_USED (TREE_VALUE (link)))
1313 warning_with_decl (TREE_VALUE (link),
1314 "label `%s' defined but not used");
1315 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1317 /* Delete this element from the list. */
1318 link = TREE_CHAIN (link);
1320 TREE_CHAIN (prev) = link;
1322 named_labels = link;
1327 link = TREE_CHAIN (link);
1331 /* Bring back all the labels that were shadowed. */
1332 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1333 if (DECL_NAME (TREE_VALUE (link)) != 0)
1334 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1335 = TREE_VALUE (link);
1337 named_labels = chainon (named_labels, level->names);
1338 shadowed_labels = level->shadowed;
1340 /* Pop the current level, and free the structure for reuse. */
1341 label_level_chain = label_level_chain->level_chain;
1342 level->level_chain = free_binding_level;
1343 free_binding_level = level;
1346 /* Push a definition or a declaration of struct, union or enum tag "name".
1347 "type" should be the type node.
1348 We assume that the tag "name" is not already defined.
1350 Note that the definition may really be just a forward reference.
1351 In that case, the TYPE_SIZE will be zero. */
1354 pushtag (name, type)
1357 register struct binding_level *b;
1359 /* Find the proper binding level for this type tag. */
1361 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1366 /* Record the identifier as the type's name if it has none. */
1368 if (TYPE_NAME (type) == 0)
1369 TYPE_NAME (type) = name;
1372 b->tags = tree_cons (name, type, b->tags);
1374 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1375 tagged type we just added to the current binding level. This fake
1376 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1377 to output a representation of a tagged type, and it also gives
1378 us a convenient place to record the "scope start" address for the
1381 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1383 /* An approximation for now, so we can tell this is a function-scope tag.
1384 This will be updated in poplevel. */
1385 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1388 /* Handle when a new declaration NEWDECL
1389 has the same name as an old one OLDDECL
1390 in the same binding contour.
1391 Prints an error message if appropriate.
1393 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1394 Otherwise, return 0.
1396 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1397 and OLDDECL is in an outer binding level and should thus not be changed. */
1400 duplicate_decls (newdecl, olddecl, different_binding_level)
1401 register tree newdecl, olddecl;
1402 int different_binding_level;
1404 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1405 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1406 && DECL_INITIAL (newdecl) != 0);
1407 tree oldtype = TREE_TYPE (olddecl);
1408 tree newtype = TREE_TYPE (newdecl);
1411 if (DECL_P (olddecl))
1412 DECL_MACHINE_ATTRIBUTES (newdecl)
1413 = merge_machine_decl_attributes (olddecl, newdecl);
1415 if (TREE_CODE (newtype) == ERROR_MARK
1416 || TREE_CODE (oldtype) == ERROR_MARK)
1419 /* New decl is completely inconsistent with the old one =>
1420 tell caller to replace the old one.
1421 This is always an error except in the case of shadowing a builtin. */
1422 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1424 if (TREE_CODE (olddecl) == FUNCTION_DECL
1425 && (DECL_BUILT_IN (olddecl)
1426 || DECL_BUILT_IN_NONANSI (olddecl)))
1428 /* If you declare a built-in or predefined function name as static,
1429 the old definition is overridden,
1430 but optionally warn this was a bad choice of name. */
1431 if (!TREE_PUBLIC (newdecl))
1435 else if (DECL_BUILT_IN (olddecl))
1436 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1438 warning_with_decl (newdecl, "shadowing library function `%s'");
1440 /* Likewise, if the built-in is not ansi, then programs can
1441 override it even globally without an error. */
1442 else if (! DECL_BUILT_IN (olddecl))
1443 warning_with_decl (newdecl,
1444 "library function `%s' declared as non-function");
1446 else if (DECL_BUILT_IN_NONANSI (olddecl))
1447 warning_with_decl (newdecl,
1448 "built-in function `%s' declared as non-function");
1450 warning_with_decl (newdecl,
1451 "built-in function `%s' declared as non-function");
1455 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1456 error_with_decl (olddecl, "previous declaration of `%s'");
1462 /* For real parm decl following a forward decl,
1463 return 1 so old decl will be reused. */
1464 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1465 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1468 /* The new declaration is the same kind of object as the old one.
1469 The declarations may partially match. Print warnings if they don't
1470 match enough. Ultimately, copy most of the information from the new
1471 decl to the old one, and keep using the old one. */
1473 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1474 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1475 && DECL_INITIAL (olddecl) == 0)
1476 /* If -traditional, avoid error for redeclaring fcn
1477 after implicit decl. */
1479 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1480 && DECL_BUILT_IN (olddecl))
1482 /* A function declaration for a built-in function. */
1483 if (!TREE_PUBLIC (newdecl))
1485 /* If you declare a built-in function name as static, the
1486 built-in definition is overridden,
1487 but optionally warn this was a bad choice of name. */
1489 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1490 /* Discard the old built-in function. */
1493 else if (!types_match)
1495 /* Accept the return type of the new declaration if same modes. */
1496 tree oldreturntype = TREE_TYPE (oldtype);
1497 tree newreturntype = TREE_TYPE (newtype);
1499 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1501 /* Function types may be shared, so we can't just modify
1502 the return type of olddecl's function type. */
1504 = build_function_type (newreturntype,
1505 TYPE_ARG_TYPES (oldtype));
1507 types_match = comptypes (newtype, trytype);
1511 /* Accept harmless mismatch in first argument type also.
1512 This is for the ffs and fprintf builtins. */
1513 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1514 && TYPE_ARG_TYPES (oldtype) != 0
1515 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1516 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1517 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1518 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1520 /* Function types may be shared, so we can't just modify
1521 the return type of olddecl's function type. */
1523 = build_function_type (TREE_TYPE (oldtype),
1524 tree_cons (NULL_TREE,
1525 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1526 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1528 types_match = comptypes (newtype, trytype);
1532 if (! different_binding_level)
1533 TREE_TYPE (olddecl) = oldtype;
1537 /* If types don't match for a built-in, throw away the built-in. */
1538 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1542 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1543 && DECL_SOURCE_LINE (olddecl) == 0)
1545 /* A function declaration for a predeclared function
1546 that isn't actually built in. */
1547 if (!TREE_PUBLIC (newdecl))
1549 /* If you declare it as static, the
1550 default definition is overridden. */
1553 else if (!types_match)
1555 /* If the types don't match, preserve volatility indication.
1556 Later on, we will discard everything else about the
1557 default declaration. */
1558 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1561 /* Permit char *foo () to match void *foo (...) if not pedantic,
1562 if one of them came from a system header file. */
1563 else if (!types_match
1564 && TREE_CODE (olddecl) == FUNCTION_DECL
1565 && TREE_CODE (newdecl) == FUNCTION_DECL
1566 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1567 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1568 && (DECL_IN_SYSTEM_HEADER (olddecl)
1569 || DECL_IN_SYSTEM_HEADER (newdecl))
1570 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1571 && TYPE_ARG_TYPES (oldtype) == 0
1572 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1573 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1575 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1576 && TYPE_ARG_TYPES (newtype) == 0
1577 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1578 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1581 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1582 /* Make sure we keep void * as ret type, not char *. */
1583 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1584 TREE_TYPE (newdecl) = newtype = oldtype;
1586 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1587 we will come back here again. */
1588 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1590 else if (!types_match
1591 /* Permit char *foo (int, ...); followed by char *foo ();
1593 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1595 /* Return types must still match. */
1596 && comptypes (TREE_TYPE (oldtype),
1597 TREE_TYPE (newtype))
1598 && TYPE_ARG_TYPES (newtype) == 0))
1600 error_with_decl (newdecl, "conflicting types for `%s'");
1601 /* Check for function type mismatch
1602 involving an empty arglist vs a nonempty one. */
1603 if (TREE_CODE (olddecl) == FUNCTION_DECL
1604 && comptypes (TREE_TYPE (oldtype),
1605 TREE_TYPE (newtype))
1606 && ((TYPE_ARG_TYPES (oldtype) == 0
1607 && DECL_INITIAL (olddecl) == 0)
1609 (TYPE_ARG_TYPES (newtype) == 0
1610 && DECL_INITIAL (newdecl) == 0)))
1612 /* Classify the problem further. */
1613 register tree t = TYPE_ARG_TYPES (oldtype);
1615 t = TYPE_ARG_TYPES (newtype);
1616 for (; t; t = TREE_CHAIN (t))
1618 register tree type = TREE_VALUE (t);
1620 if (TREE_CHAIN (t) == 0
1621 && TYPE_MAIN_VARIANT (type) != void_type_node)
1623 error ("A parameter list with an ellipsis can't match an empty parameter name list declaration.");
1627 if (simple_type_promotes_to (type) != NULL_TREE)
1629 error ("An argument type that has a default promotion can't match an empty parameter name list declaration.");
1634 error_with_decl (olddecl, "previous declaration of `%s'");
1638 errmsg = redeclaration_error_message (newdecl, olddecl);
1644 error_with_decl (newdecl, "redefinition of `%s'");
1647 error_with_decl (newdecl, "redeclaration of `%s'");
1650 error_with_decl (newdecl, "conflicting declarations of `%s'");
1656 error_with_decl (olddecl,
1657 ((DECL_INITIAL (olddecl)
1658 && current_binding_level == global_binding_level)
1659 ? "`%s' previously defined here"
1660 : "`%s' previously declared here"));
1662 else if (TREE_CODE (newdecl) == TYPE_DECL
1663 && (DECL_IN_SYSTEM_HEADER (olddecl)
1664 || DECL_IN_SYSTEM_HEADER (newdecl)))
1666 warning_with_decl (newdecl, "redefinition of `%s'");
1669 ((DECL_INITIAL (olddecl)
1670 && current_binding_level == global_binding_level)
1671 ? "`%s' previously defined here"
1672 : "`%s' previously declared here"));
1674 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1675 && DECL_INITIAL (olddecl) != 0
1676 && TYPE_ARG_TYPES (oldtype) == 0
1677 && TYPE_ARG_TYPES (newtype) != 0
1678 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1680 register tree type, parm;
1682 /* Prototype decl follows defn w/o prototype. */
1684 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1685 type = TYPE_ARG_TYPES (newtype),
1688 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1690 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1691 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1693 warning_with_decl (newdecl, "prototype for `%s' follows");
1694 warning_with_decl (olddecl, "non-prototype definition here");
1697 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1698 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1700 error_with_decl (newdecl,
1701 "prototype for `%s' follows and number of arguments doesn't match");
1702 error_with_decl (olddecl, "non-prototype definition here");
1706 /* Type for passing arg must be consistent
1707 with that declared for the arg. */
1708 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1709 /* If -traditional, allow `unsigned int' instead of `int'
1710 in the prototype. */
1711 && (! (flag_traditional
1712 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1713 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1715 error_with_decl (newdecl,
1716 "prototype for `%s' follows and argument %d doesn't match",
1718 error_with_decl (olddecl, "non-prototype definition here");
1724 /* Warn about mismatches in various flags. */
1727 /* Warn if function is now inline
1728 but was previously declared not inline and has been called. */
1729 if (TREE_CODE (olddecl) == FUNCTION_DECL
1730 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1731 && TREE_USED (olddecl))
1732 warning_with_decl (newdecl,
1733 "`%s' declared inline after being called");
1734 if (TREE_CODE (olddecl) == FUNCTION_DECL
1735 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1736 && DECL_INITIAL (olddecl) != 0)
1737 warning_with_decl (newdecl,
1738 "`%s' declared inline after its definition");
1740 /* If pedantic, warn when static declaration follows a non-static
1741 declaration. Otherwise, do so only for functions. */
1742 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1743 && TREE_PUBLIC (olddecl)
1744 && !TREE_PUBLIC (newdecl))
1745 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1747 /* If warn_traditional, warn when a non-static function
1748 declaration follows a static one. */
1749 if (warn_traditional && !in_system_header
1750 && TREE_CODE (olddecl) == FUNCTION_DECL
1751 && !TREE_PUBLIC (olddecl)
1752 && TREE_PUBLIC (newdecl))
1753 warning_with_decl (newdecl, "non-static declaration for `%s' follows static");
1755 /* Warn when const declaration follows a non-const
1756 declaration, but not for functions. */
1757 if (TREE_CODE (olddecl) != FUNCTION_DECL
1758 && !TREE_READONLY (olddecl)
1759 && TREE_READONLY (newdecl))
1760 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1761 /* These bits are logically part of the type, for variables.
1762 But not for functions
1763 (where qualifiers are not valid ANSI anyway). */
1764 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1765 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1766 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1767 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1771 /* Optionally warn about more than one declaration for the same name. */
1772 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1773 /* Don't warn about a function declaration
1774 followed by a definition. */
1775 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1776 && DECL_INITIAL (olddecl) == 0)
1777 /* Don't warn about extern decl followed by (tentative) definition. */
1778 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1780 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1781 warning_with_decl (olddecl, "previous declaration of `%s'");
1784 /* Copy all the DECL_... slots specified in the new decl
1785 except for any that we copy here from the old type.
1787 Past this point, we don't change OLDTYPE and NEWTYPE
1788 even if we change the types of NEWDECL and OLDDECL. */
1792 /* When copying info to olddecl, we store into write_olddecl
1793 instead. This allows us to avoid modifying olddecl when
1794 different_binding_level is true. */
1795 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1797 /* Merge the data types specified in the two decls. */
1798 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1800 if (different_binding_level)
1802 if (TYPE_ARG_TYPES (oldtype) != 0
1803 && TYPE_ARG_TYPES (newtype) == 0)
1804 TREE_TYPE (newdecl) = common_type (newtype, oldtype);
1807 = build_type_attribute_variant
1809 merge_attributes (TYPE_ATTRIBUTES (newtype),
1810 TYPE_ATTRIBUTES (oldtype)));
1814 = TREE_TYPE (olddecl)
1815 = common_type (newtype, oldtype);
1818 /* Lay the type out, unless already done. */
1819 if (oldtype != TREE_TYPE (newdecl))
1821 if (TREE_TYPE (newdecl) != error_mark_node)
1822 layout_type (TREE_TYPE (newdecl));
1823 if (TREE_CODE (newdecl) != FUNCTION_DECL
1824 && TREE_CODE (newdecl) != TYPE_DECL
1825 && TREE_CODE (newdecl) != CONST_DECL)
1826 layout_decl (newdecl, 0);
1830 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1831 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1832 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1833 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1834 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1835 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1837 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1838 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1842 /* Keep the old rtl since we can safely use it. */
1843 COPY_DECL_RTL (olddecl, newdecl);
1845 /* Merge the type qualifiers. */
1846 if (TREE_CODE (olddecl) == FUNCTION_DECL
1847 && DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1848 && ! TREE_THIS_VOLATILE (newdecl))
1849 TREE_THIS_VOLATILE (write_olddecl) = 0;
1851 if (TREE_READONLY (newdecl))
1852 TREE_READONLY (write_olddecl) = 1;
1854 if (TREE_THIS_VOLATILE (newdecl))
1856 TREE_THIS_VOLATILE (write_olddecl) = 1;
1857 if (TREE_CODE (newdecl) == VAR_DECL
1858 /* If an automatic variable is re-declared in the same
1859 function scope, but the old declaration was not
1860 volatile, make_var_volatile() would crash because the
1861 variable would have been assigned to a pseudo, not a
1862 MEM. Since this duplicate declaration is invalid
1863 anyway, we just skip the call. */
1865 make_var_volatile (newdecl);
1868 /* Keep source location of definition rather than declaration. */
1869 /* When called with different_binding_level set, keep the old
1870 information so that meaningful diagnostics can be given. */
1871 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1872 && ! different_binding_level)
1874 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1875 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1878 /* Merge the unused-warning information. */
1879 if (DECL_IN_SYSTEM_HEADER (olddecl))
1880 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1881 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1882 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1884 /* Merge the initialization information. */
1885 /* When called with different_binding_level set, don't copy over
1886 DECL_INITIAL, so that we don't accidentally change function
1887 declarations into function definitions. */
1888 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1889 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1891 /* Merge the section attribute.
1892 We want to issue an error if the sections conflict but that must be
1893 done later in decl_attributes since we are called before attributes
1895 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1896 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1898 /* Copy the assembler name.
1899 Currently, it can only be defined in the prototype. */
1900 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1902 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1904 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1905 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1907 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1908 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1909 DECL_NO_CHECK_MEMORY_USAGE (newdecl)
1910 |= DECL_NO_CHECK_MEMORY_USAGE (olddecl);
1911 DECL_NO_LIMIT_STACK (newdecl)
1912 |= DECL_NO_LIMIT_STACK (olddecl);
1915 /* If cannot merge, then use the new type and qualifiers,
1916 and don't preserve the old rtl. */
1917 else if (! different_binding_level)
1919 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1920 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1921 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1922 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1925 /* Merge the storage class information. */
1926 DECL_WEAK (newdecl) |= DECL_WEAK (olddecl);
1927 /* For functions, static overrides non-static. */
1928 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1930 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1931 /* This is since we don't automatically
1932 copy the attributes of NEWDECL into OLDDECL. */
1933 /* No need to worry about different_binding_level here because
1934 then TREE_PUBLIC (newdecl) was true. */
1935 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1936 /* If this clears `static', clear it in the identifier too. */
1937 if (! TREE_PUBLIC (olddecl))
1938 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1940 if (DECL_EXTERNAL (newdecl))
1942 if (! different_binding_level)
1944 /* Don't mess with these flags on local externs; they remain
1945 external even if there's a declaration at file scope which
1947 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1948 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1950 /* An extern decl does not override previous storage class. */
1951 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1952 if (! DECL_EXTERNAL (newdecl))
1953 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1957 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1958 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1961 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1963 /* If we're redefining a function previously defined as extern
1964 inline, make sure we emit debug info for the inline before we
1965 throw it away, in case it was inlined into a function that hasn't
1966 been written out yet. */
1967 if (new_is_definition && DECL_INITIAL (olddecl) && TREE_USED (olddecl))
1969 note_outlining_of_inline_function (olddecl);
1971 /* The new defn must not be inline. */
1972 DECL_INLINE (newdecl) = 0;
1973 DECL_UNINLINABLE (newdecl) = 1;
1977 /* If either decl says `inline', this fn is inline,
1978 unless its definition was passed already. */
1979 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
1980 DECL_INLINE (olddecl) = 1;
1982 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1985 if (DECL_BUILT_IN (olddecl))
1987 /* Get rid of any built-in function if new arg types don't match it
1988 or if we have a function definition. */
1989 if (! types_match || new_is_definition)
1991 if (! different_binding_level)
1993 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1994 DECL_BUILT_IN_CLASS (olddecl) = NOT_BUILT_IN;
1999 /* If redeclaring a builtin function, and not a definition,
2000 it stays built in. */
2001 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2002 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2005 /* Also preserve various other info from the definition. */
2006 else if (! new_is_definition)
2007 DECL_NUM_STMTS (newdecl) = DECL_NUM_STMTS (olddecl);
2008 if (! new_is_definition)
2010 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2011 /* When called with different_binding_level set, don't copy over
2012 DECL_INITIAL, so that we don't accidentally change function
2013 declarations into function definitions. */
2014 if (! different_binding_level)
2015 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2016 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
2017 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2018 if (DECL_INLINE (newdecl))
2019 DECL_ABSTRACT_ORIGIN (newdecl) = DECL_ABSTRACT_ORIGIN (olddecl);
2022 if (different_binding_level)
2025 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2026 But preserve OLDDECL's DECL_UID. */
2028 register unsigned olddecl_uid = DECL_UID (olddecl);
2030 memcpy ((char *) olddecl + sizeof (struct tree_common),
2031 (char *) newdecl + sizeof (struct tree_common),
2032 sizeof (struct tree_decl) - sizeof (struct tree_common));
2033 DECL_UID (olddecl) = olddecl_uid;
2036 /* NEWDECL contains the merged attribute lists.
2037 Update OLDDECL to be the same. */
2038 DECL_MACHINE_ATTRIBUTES (olddecl) = DECL_MACHINE_ATTRIBUTES (newdecl);
2043 /* Record a decl-node X as belonging to the current lexical scope.
2044 Check for errors (such as an incompatible declaration for the same
2045 name already seen in the same scope).
2047 Returns either X or an old decl for the same name.
2048 If an old decl is returned, it may have been smashed
2049 to agree with what X says. */
2056 register tree name = DECL_NAME (x);
2057 register struct binding_level *b = current_binding_level;
2059 DECL_CONTEXT (x) = current_function_decl;
2060 /* A local extern declaration for a function doesn't constitute nesting.
2061 A local auto declaration does, since it's a forward decl
2062 for a nested function coming later. */
2063 if ((TREE_CODE (x) == FUNCTION_DECL || TREE_CODE (x) == VAR_DECL)
2064 && DECL_INITIAL (x) == 0 && DECL_EXTERNAL (x))
2065 DECL_CONTEXT (x) = 0;
2067 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
2068 && x != IDENTIFIER_IMPLICIT_DECL (name)
2069 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
2070 && !DECL_IN_SYSTEM_HEADER (x))
2071 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
2077 int different_binding_level = 0;
2079 t = lookup_name_current_level (name);
2080 /* Don't type check externs here when -traditional. This is so that
2081 code with conflicting declarations inside blocks will get warnings
2082 not errors. X11 for instance depends on this. */
2083 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
2085 t = IDENTIFIER_GLOBAL_VALUE (name);
2086 /* Type decls at global scope don't conflict with externs declared
2087 inside lexical blocks. */
2088 if (t && TREE_CODE (t) == TYPE_DECL)
2090 different_binding_level = 1;
2092 if (t != 0 && t == error_mark_node)
2093 /* error_mark_node is 0 for a while during initialization! */
2096 error_with_decl (x, "`%s' used prior to declaration");
2101 file = DECL_SOURCE_FILE (t);
2102 line = DECL_SOURCE_LINE (t);
2105 /* If this decl is `static' and an implicit decl was seen previously,
2106 warn. But don't complain if -traditional,
2107 since traditional compilers don't complain. */
2108 if (! flag_traditional && TREE_PUBLIC (name)
2109 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2110 sets this for all functions. */
2111 && ! TREE_PUBLIC (x)
2112 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2113 /* We used to warn also for explicit extern followed by static,
2114 but sometimes you need to do it that way. */
2115 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2117 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2118 IDENTIFIER_POINTER (name));
2119 pedwarn_with_file_and_line
2120 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2121 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2122 "previous declaration of `%s'",
2123 IDENTIFIER_POINTER (name));
2124 TREE_THIS_VOLATILE (name) = 1;
2127 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2129 if (TREE_CODE (t) == PARM_DECL)
2131 /* Don't allow more than one "real" duplicate
2132 of a forward parm decl. */
2133 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2139 /* If we are processing a typedef statement, generate a whole new
2140 ..._TYPE node (which will be just an variant of the existing
2141 ..._TYPE node with identical properties) and then install the
2142 TYPE_DECL node generated to represent the typedef name as the
2143 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2145 The whole point here is to end up with a situation where each
2146 and every ..._TYPE node the compiler creates will be uniquely
2147 associated with AT MOST one node representing a typedef name.
2148 This way, even though the compiler substitutes corresponding
2149 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2150 early on, later parts of the compiler can always do the reverse
2151 translation and get back the corresponding typedef name. For
2154 typedef struct S MY_TYPE;
2157 Later parts of the compiler might only know that `object' was of
2158 type `struct S' if it were not for code just below. With this
2159 code however, later parts of the compiler see something like:
2161 struct S' == struct S
2162 typedef struct S' MY_TYPE;
2165 And they can then deduce (from the node for type struct S') that
2166 the original object declaration was:
2170 Being able to do this is important for proper support of protoize,
2171 and also for generating precise symbolic debugging information
2172 which takes full account of the programmer's (typedef) vocabulary.
2174 Obviously, we don't want to generate a duplicate ..._TYPE node if
2175 the TYPE_DECL node that we are now processing really represents a
2176 standard built-in type.
2178 Since all standard types are effectively declared at line zero
2179 in the source file, we can easily check to see if we are working
2180 on a standard type by checking the current value of lineno. */
2182 if (TREE_CODE (x) == TYPE_DECL)
2184 if (DECL_SOURCE_LINE (x) == 0)
2186 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2187 TYPE_NAME (TREE_TYPE (x)) = x;
2189 else if (TREE_TYPE (x) != error_mark_node
2190 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2192 tree tt = TREE_TYPE (x);
2193 DECL_ORIGINAL_TYPE (x) = tt;
2194 tt = build_type_copy (tt);
2196 TREE_USED (tt) = TREE_USED (x);
2201 /* Multiple external decls of the same identifier ought to match.
2202 Check against both global declarations (when traditional) and out of
2203 scope (limbo) block level declarations.
2205 We get warnings about inline functions where they are defined.
2206 Avoid duplicate warnings where they are used. */
2208 && ! (TREE_CODE (x) == FUNCTION_DECL && DECL_INLINE (x)))
2212 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2213 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2214 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2215 decl = IDENTIFIER_GLOBAL_VALUE (name);
2216 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2217 /* Decls in limbo are always extern, so no need to check that. */
2218 decl = IDENTIFIER_LIMBO_VALUE (name);
2222 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2223 /* If old decl is built-in, we already warned if we should. */
2224 && !DECL_BUILT_IN (decl))
2226 pedwarn_with_decl (x,
2227 "type mismatch with previous external decl");
2228 pedwarn_with_decl (decl, "previous external decl of `%s'");
2232 /* If a function has had an implicit declaration, and then is defined,
2233 make sure they are compatible. */
2235 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2236 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2237 && TREE_CODE (x) == FUNCTION_DECL
2238 && ! comptypes (TREE_TYPE (x),
2239 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2241 warning_with_decl (x, "type mismatch with previous implicit declaration");
2242 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2243 "previous implicit declaration of `%s'");
2246 /* In PCC-compatibility mode, extern decls of vars with no current decl
2247 take effect at top level no matter where they are. */
2248 if (flag_traditional && DECL_EXTERNAL (x)
2249 && lookup_name (name) == 0)
2251 tree type = TREE_TYPE (x);
2253 /* But don't do this if the type contains temporary nodes. */
2256 if (type == error_mark_node)
2258 if (TYPE_CONTEXT (type))
2260 warning_with_decl (x, "type of external `%s' is not global");
2261 /* By exiting the loop early, we leave TYPE nonzero,
2262 and thus prevent globalization of the decl. */
2265 else if (TREE_CODE (type) == FUNCTION_TYPE
2266 && TYPE_ARG_TYPES (type) != 0)
2267 /* The types might not be truly local,
2268 but the list of arg types certainly is temporary.
2269 Since prototypes are nontraditional,
2270 ok not to do the traditional thing. */
2272 type = TREE_TYPE (type);
2276 b = global_binding_level;
2279 /* This name is new in its binding level.
2280 Install the new declaration and return it. */
2281 if (b == global_binding_level)
2283 /* Install a global value. */
2285 /* If the first global decl has external linkage,
2286 warn if we later see static one. */
2287 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2288 TREE_PUBLIC (name) = 1;
2290 IDENTIFIER_GLOBAL_VALUE (name) = x;
2292 /* We no longer care about any previous block level declarations. */
2293 IDENTIFIER_LIMBO_VALUE (name) = 0;
2295 /* Don't forget if the function was used via an implicit decl. */
2296 if (IDENTIFIER_IMPLICIT_DECL (name)
2297 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2298 TREE_USED (x) = 1, TREE_USED (name) = 1;
2300 /* Don't forget if its address was taken in that way. */
2301 if (IDENTIFIER_IMPLICIT_DECL (name)
2302 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2303 TREE_ADDRESSABLE (x) = 1;
2305 /* Warn about mismatches against previous implicit decl. */
2306 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2307 /* If this real decl matches the implicit, don't complain. */
2308 && ! (TREE_CODE (x) == FUNCTION_DECL
2309 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2310 == integer_type_node)))
2311 pedwarn ("`%s' was previously implicitly declared to return `int'",
2312 IDENTIFIER_POINTER (name));
2314 /* If this decl is `static' and an `extern' was seen previously,
2315 that is erroneous. */
2316 if (TREE_PUBLIC (name)
2317 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2319 /* Okay to redeclare an ANSI built-in as static. */
2320 if (t != 0 && DECL_BUILT_IN (t))
2322 /* Okay to declare a non-ANSI built-in as anything. */
2323 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2325 /* Okay to have global type decl after an earlier extern
2326 declaration inside a lexical block. */
2327 else if (TREE_CODE (x) == TYPE_DECL)
2329 else if (IDENTIFIER_IMPLICIT_DECL (name))
2331 if (! TREE_THIS_VOLATILE (name))
2332 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2333 IDENTIFIER_POINTER (name));
2336 pedwarn ("`%s' was declared `extern' and later `static'",
2337 IDENTIFIER_POINTER (name));
2342 /* Here to install a non-global value. */
2343 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2344 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2346 IDENTIFIER_LOCAL_VALUE (name) = x;
2348 /* If this is an extern function declaration, see if we
2349 have a global definition or declaration for the function. */
2352 && TREE_CODE (x) == FUNCTION_DECL
2353 && TREE_CODE (oldglobal) == FUNCTION_DECL
2354 && DECL_EXTERNAL (x) && ! DECL_INLINE (x))
2356 /* We have one. Their types must agree. */
2357 if (! comptypes (TREE_TYPE (x),
2358 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2359 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2362 /* Inner extern decl is inline if global one is.
2363 Copy enough to really inline it. */
2364 if (DECL_INLINE (oldglobal))
2366 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2367 DECL_INITIAL (x) = (current_function_decl == oldglobal
2368 ? 0 : DECL_INITIAL (oldglobal));
2369 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2370 DECL_NUM_STMTS (x) = DECL_NUM_STMTS (oldglobal);
2371 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2372 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2373 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2374 DECL_ABSTRACT_ORIGIN (x)
2375 = DECL_ABSTRACT_ORIGIN (oldglobal);
2377 /* Inner extern decl is built-in if global one is. */
2378 if (DECL_BUILT_IN (oldglobal))
2380 DECL_BUILT_IN_CLASS (x) = DECL_BUILT_IN_CLASS (oldglobal);
2381 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2383 /* Keep the arg types from a file-scope fcn defn. */
2384 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2385 && DECL_INITIAL (oldglobal)
2386 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2387 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2392 /* This case is probably sometimes the right thing to do. */
2393 /* If we have a local external declaration,
2394 then any file-scope declaration should not
2395 have been static. */
2396 if (oldlocal == 0 && oldglobal != 0
2397 && !TREE_PUBLIC (oldglobal)
2398 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2399 warning ("`%s' locally external but globally static",
2400 IDENTIFIER_POINTER (name));
2403 /* If we have a local external declaration,
2404 and no file-scope declaration has yet been seen,
2405 then if we later have a file-scope decl it must not be static. */
2407 && DECL_EXTERNAL (x)
2411 TREE_PUBLIC (name) = 1;
2413 /* Save this decl, so that we can do type checking against
2414 other decls after it falls out of scope.
2416 Only save it once. This prevents temporary decls created in
2417 expand_inline_function from being used here, since this
2418 will have been set when the inline function was parsed.
2419 It also helps give slightly better warnings. */
2420 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2421 IDENTIFIER_LIMBO_VALUE (name) = x;
2424 /* Warn if shadowing an argument at the top level of the body. */
2425 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2426 /* This warning doesn't apply to the parms of a nested fcn. */
2427 && ! current_binding_level->parm_flag
2428 /* Check that this is one level down from the parms. */
2429 && current_binding_level->level_chain->parm_flag
2430 /* Check that the decl being shadowed
2431 comes from the parm level, one level up. */
2432 && chain_member (oldlocal, current_binding_level->level_chain->names))
2434 if (TREE_CODE (oldlocal) == PARM_DECL)
2435 pedwarn ("declaration of `%s' shadows a parameter",
2436 IDENTIFIER_POINTER (name));
2438 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2439 IDENTIFIER_POINTER (name));
2442 /* Maybe warn if shadowing something else. */
2443 else if (warn_shadow && !DECL_EXTERNAL (x)
2444 /* No shadow warnings for internally generated vars. */
2445 && DECL_SOURCE_LINE (x) != 0
2446 /* No shadow warnings for vars made for inlining. */
2447 && ! DECL_FROM_INLINE (x))
2449 const char *id = IDENTIFIER_POINTER (name);
2451 if (TREE_CODE (x) == PARM_DECL
2452 && current_binding_level->level_chain->parm_flag)
2453 /* Don't warn about the parm names in function declarator
2454 within a function declarator.
2455 It would be nice to avoid warning in any function
2456 declarator in a declaration, as opposed to a definition,
2457 but there is no way to tell it's not a definition. */
2459 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2460 warning ("declaration of `%s' shadows a parameter", id);
2461 else if (oldlocal != 0)
2462 warning ("declaration of `%s' shadows previous local", id);
2463 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2464 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2465 warning ("declaration of `%s' shadows global declaration", id);
2468 /* If storing a local value, there may already be one (inherited).
2469 If so, record it for restoration when this binding level ends. */
2471 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2474 /* Keep count of variables in this level with incomplete type.
2475 If the input is erroneous, we can have error_mark in the type
2476 slot (e.g. "f(void a, ...)") - that doesn't count as an
2478 if (TREE_TYPE (x) != error_mark_node
2479 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2483 /* Put decls on list in reverse order.
2484 We will reverse them later if necessary. */
2485 TREE_CHAIN (x) = b->names;
2491 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2494 pushdecl_top_level (x)
2498 register struct binding_level *b = current_binding_level;
2500 current_binding_level = global_binding_level;
2502 current_binding_level = b;
2506 /* Generate an implicit declaration for identifier FUNCTIONID
2507 as a function of type int (). Print a warning if appropriate. */
2510 implicitly_declare (functionid)
2514 int traditional_warning = 0;
2515 /* Only one "implicit declaration" warning per identifier. */
2516 int implicit_warning;
2518 /* We used to reuse an old implicit decl here,
2519 but this loses with inline functions because it can clobber
2520 the saved decl chains. */
2522 if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2523 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2526 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2528 /* Warn of implicit decl following explicit local extern decl.
2529 This is probably a program designed for traditional C. */
2530 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2531 traditional_warning = 1;
2533 /* Warn once of an implicit declaration. */
2534 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2536 DECL_EXTERNAL (decl) = 1;
2537 TREE_PUBLIC (decl) = 1;
2539 /* Record that we have an implicit decl and this is it. */
2540 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2542 /* ANSI standard says implicit declarations are in the innermost block.
2543 So we record the decl in the standard fashion.
2544 If flag_traditional is set, pushdecl does it top-level. */
2547 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2548 maybe_objc_check_decl (decl);
2550 rest_of_decl_compilation (decl, NULL, 0, 0);
2552 if (implicit_warning)
2553 implicit_decl_warning (functionid);
2554 else if (warn_traditional && traditional_warning)
2555 warning ("function `%s' was previously declared within a block",
2556 IDENTIFIER_POINTER (functionid));
2558 /* Write a record describing this implicit function declaration to the
2559 prototypes file (if requested). */
2561 gen_aux_info_record (decl, 0, 1, 0);
2567 implicit_decl_warning (id)
2570 const char *name = IDENTIFIER_POINTER (id);
2571 if (mesg_implicit_function_declaration == 2)
2572 error ("implicit declaration of function `%s'", name);
2573 else if (mesg_implicit_function_declaration == 1)
2574 warning ("implicit declaration of function `%s'", name);
2577 /* Return zero if the declaration NEWDECL is valid
2578 when the declaration OLDDECL (assumed to be for the same name)
2579 has already been seen.
2580 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
2581 and 3 if it is a conflicting declaration. */
2584 redeclaration_error_message (newdecl, olddecl)
2585 tree newdecl, olddecl;
2587 if (TREE_CODE (newdecl) == TYPE_DECL)
2589 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2591 /* pushdecl creates distinct types for TYPE_DECLs by calling
2592 build_type_copy, so the above comparison generally fails. We do
2593 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2594 is equivalent to what this code used to do before the build_type_copy
2595 call. The variant type distinction should not matter for traditional
2596 code, because it doesn't have type qualifiers. */
2597 if (flag_traditional
2598 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
2600 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2604 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2606 /* Declarations of functions can insist on internal linkage
2607 but they can't be inconsistent with internal linkage,
2608 so there can be no error on that account.
2609 However defining the same name twice is no good. */
2610 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2611 /* However, defining once as extern inline and a second
2612 time in another way is ok. */
2613 && ! (DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2614 && ! (DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2618 else if (DECL_CONTEXT (newdecl) == NULL_TREE)
2620 /* Objects declared at top level: */
2621 /* If at least one is a reference, it's ok. */
2622 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2624 /* Reject two definitions. */
2625 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2627 /* Now we have two tentative defs, or one tentative and one real def. */
2628 /* Insist that the linkage match. */
2629 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2633 else if (current_binding_level->parm_flag
2634 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2638 /* Newdecl has block scope. If olddecl has block scope also, then
2639 reject two definitions, and reject a definition together with an
2640 external reference. Otherwise, it is OK, because newdecl must
2641 be an extern reference to olddecl. */
2642 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2643 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2649 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2650 Create one if none exists so far for the current function.
2651 This function is called for both label definitions and label references. */
2657 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2659 if (current_function_decl == 0)
2661 error ("label %s referenced outside of any function",
2662 IDENTIFIER_POINTER (id));
2666 /* Use a label already defined or ref'd with this name. */
2669 /* But not if it is inherited and wasn't declared to be inheritable. */
2670 if (DECL_CONTEXT (decl) != current_function_decl
2671 && ! C_DECLARED_LABEL_FLAG (decl))
2672 return shadow_label (id);
2676 decl = build_decl (LABEL_DECL, id, void_type_node);
2678 /* A label not explicitly declared must be local to where it's ref'd. */
2679 DECL_CONTEXT (decl) = current_function_decl;
2681 DECL_MODE (decl) = VOIDmode;
2683 /* Say where one reference is to the label,
2684 for the sake of the error if it is not defined. */
2685 DECL_SOURCE_LINE (decl) = lineno;
2686 DECL_SOURCE_FILE (decl) = input_filename;
2688 IDENTIFIER_LABEL_VALUE (id) = decl;
2690 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2695 /* Make a label named NAME in the current function,
2696 shadowing silently any that may be inherited from containing functions
2697 or containing scopes.
2699 Note that valid use, if the label being shadowed
2700 comes from another scope in the same function,
2701 requires calling declare_nonlocal_label right away. */
2707 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2713 /* Check to make sure that the label hasn't already been declared
2714 at this label scope */
2715 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2716 if (TREE_VALUE (dup) == decl)
2718 error ("duplicate label declaration `%s'",
2719 IDENTIFIER_POINTER (name));
2720 error_with_decl (TREE_VALUE (dup),
2721 "this is a previous declaration");
2722 /* Just use the previous declaration. */
2723 return lookup_label (name);
2726 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2727 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2730 return lookup_label (name);
2733 /* Define a label, specifying the location in the source file.
2734 Return the LABEL_DECL node for the label, if the definition is valid.
2735 Otherwise return 0. */
2738 define_label (filename, line, name)
2739 const char *filename;
2743 tree decl = lookup_label (name);
2745 /* If label with this name is known from an outer context, shadow it. */
2746 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2748 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2749 IDENTIFIER_LABEL_VALUE (name) = 0;
2750 decl = lookup_label (name);
2753 if (warn_traditional && !in_system_header && lookup_name (name))
2754 warning_with_file_and_line (filename, line,
2755 "traditional C lacks a separate namespace for labels, identifier `%s' conflicts",
2756 IDENTIFIER_POINTER (name));
2758 if (DECL_INITIAL (decl) != 0)
2760 error_with_file_and_line (filename, line, "duplicate label `%s'",
2761 IDENTIFIER_POINTER (name));
2766 /* Mark label as having been defined. */
2767 DECL_INITIAL (decl) = error_mark_node;
2768 /* Say where in the source. */
2769 DECL_SOURCE_FILE (decl) = filename;
2770 DECL_SOURCE_LINE (decl) = line;
2775 /* Return the list of declarations of the current level.
2776 Note that this list is in reverse order unless/until
2777 you nreverse it; and when you do nreverse it, you must
2778 store the result back using `storedecls' or you will lose. */
2783 return current_binding_level->names;
2786 /* Return the list of type-tags (for structs, etc) of the current level. */
2791 return current_binding_level->tags;
2794 /* Store the list of declarations of the current level.
2795 This is done for the parameter declarations of a function being defined,
2796 after they are modified in the light of any missing parameters. */
2802 current_binding_level->names = decls;
2805 /* Similarly, store the list of tags of the current level. */
2811 current_binding_level->tags = tags;
2814 /* Given NAME, an IDENTIFIER_NODE,
2815 return the structure (or union or enum) definition for that name.
2816 Searches binding levels from BINDING_LEVEL up to the global level.
2817 If THISLEVEL_ONLY is nonzero, searches only the specified context
2818 (but skips any tag-transparent contexts to find one that is
2819 meaningful for tags).
2820 CODE says which kind of type the caller wants;
2821 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2822 If the wrong kind of type is found, an error is reported. */
2825 lookup_tag (code, name, binding_level, thislevel_only)
2826 enum tree_code code;
2827 struct binding_level *binding_level;
2831 register struct binding_level *level;
2834 for (level = binding_level; level; level = level->level_chain)
2837 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2839 if (TREE_PURPOSE (tail) == name)
2841 if (TREE_CODE (TREE_VALUE (tail)) != code)
2843 /* Definition isn't the kind we were looking for. */
2844 pending_invalid_xref = name;
2845 pending_invalid_xref_file = input_filename;
2846 pending_invalid_xref_line = lineno;
2847 /* If in the same binding level as a declaration as a tag
2848 of a different type, this must not be allowed to
2849 shadow that tag, so give the error immediately.
2850 (For example, "struct foo; union foo;" is invalid.) */
2852 pending_xref_error ();
2854 return TREE_VALUE (tail);
2857 if (! level->tag_transparent)
2867 /* Print an error message now
2868 for a recent invalid struct, union or enum cross reference.
2869 We don't print them immediately because they are not invalid
2870 when used in the `struct foo;' construct for shadowing. */
2873 pending_xref_error ()
2875 if (pending_invalid_xref != 0)
2876 error_with_file_and_line (pending_invalid_xref_file,
2877 pending_invalid_xref_line,
2878 "`%s' defined as wrong kind of tag",
2879 IDENTIFIER_POINTER (pending_invalid_xref));
2880 pending_invalid_xref = 0;
2883 /* Given a type, find the tag that was defined for it and return the tag name.
2884 Otherwise return 0. */
2887 lookup_tag_reverse (type)
2890 register struct binding_level *level;
2892 for (level = current_binding_level; level; level = level->level_chain)
2895 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2897 if (TREE_VALUE (tail) == type)
2898 return TREE_PURPOSE (tail);
2904 /* Look up NAME in the current binding level and its superiors
2905 in the namespace of variables, functions and typedefs.
2906 Return a ..._DECL node of some kind representing its definition,
2907 or return 0 if it is undefined. */
2915 if (current_binding_level != global_binding_level
2916 && IDENTIFIER_LOCAL_VALUE (name))
2917 val = IDENTIFIER_LOCAL_VALUE (name);
2919 val = IDENTIFIER_GLOBAL_VALUE (name);
2923 /* Similar to `lookup_name' but look only at current binding level. */
2926 lookup_name_current_level (name)
2931 if (current_binding_level == global_binding_level)
2932 return IDENTIFIER_GLOBAL_VALUE (name);
2934 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2937 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2938 if (DECL_NAME (t) == name)
2944 /* Mark ARG for GC. */
2947 mark_binding_level (arg)
2950 struct binding_level *level = *(struct binding_level **) arg;
2952 for (; level != 0; level = level->level_chain)
2954 ggc_mark_tree (level->names);
2955 ggc_mark_tree (level->tags);
2956 ggc_mark_tree (level->shadowed);
2957 ggc_mark_tree (level->blocks);
2958 ggc_mark_tree (level->this_block);
2959 ggc_mark_tree (level->parm_order);
2963 /* Create the predefined scalar types of C,
2964 and some nodes representing standard constants (0, 1, (void *) 0).
2965 Initialize the global binding level.
2966 Make definitions for built-in primitive functions. */
2969 init_decl_processing ()
2971 register tree endlink;
2972 tree ptr_ftype_void, ptr_ftype_ptr;
2974 current_function_decl = NULL;
2975 named_labels = NULL;
2976 current_binding_level = NULL_BINDING_LEVEL;
2977 free_binding_level = NULL_BINDING_LEVEL;
2979 /* Make the binding_level structure for global names. */
2981 global_binding_level = current_binding_level;
2983 build_common_tree_nodes (flag_signed_char);
2985 c_common_nodes_and_builtins ();
2987 boolean_type_node = integer_type_node;
2988 boolean_true_node = integer_one_node;
2989 boolean_false_node = integer_zero_node;
2991 /* With GCC, C99's _Bool is always of size 1. */
2992 c_bool_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
2993 TREE_SET_CODE (c_bool_type_node, BOOLEAN_TYPE);
2994 TYPE_MAX_VALUE (c_bool_type_node) = build_int_2 (1, 0);
2995 TREE_TYPE (TYPE_MAX_VALUE (c_bool_type_node)) = c_bool_type_node;
2996 TYPE_PRECISION (c_bool_type_node) = 1;
2997 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2999 c_bool_false_node = build_int_2 (0, 0);
3000 TREE_TYPE (c_bool_false_node) = c_bool_type_node;
3001 c_bool_true_node = build_int_2 (1, 0);
3002 TREE_TYPE (c_bool_true_node) = c_bool_type_node;
3004 endlink = void_list_node;
3005 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
3007 = build_function_type (ptr_type_node,
3008 tree_cons (NULL_TREE, ptr_type_node, endlink));
3010 /* Types which are common to the fortran compiler and libf2c. When
3011 changing these, you also need to be concerned with f/com.h. */
3013 if (TYPE_PRECISION (float_type_node)
3014 == TYPE_PRECISION (long_integer_type_node))
3016 g77_integer_type_node = long_integer_type_node;
3017 g77_uinteger_type_node = long_unsigned_type_node;
3019 else if (TYPE_PRECISION (float_type_node)
3020 == TYPE_PRECISION (integer_type_node))
3022 g77_integer_type_node = integer_type_node;
3023 g77_uinteger_type_node = unsigned_type_node;
3026 g77_integer_type_node = g77_uinteger_type_node = NULL_TREE;
3028 if (g77_integer_type_node != NULL_TREE)
3030 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_integer"),
3031 g77_integer_type_node));
3032 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_uinteger"),
3033 g77_uinteger_type_node));
3036 if (TYPE_PRECISION (float_type_node) * 2
3037 == TYPE_PRECISION (long_integer_type_node))
3039 g77_longint_type_node = long_integer_type_node;
3040 g77_ulongint_type_node = long_unsigned_type_node;
3042 else if (TYPE_PRECISION (float_type_node) * 2
3043 == TYPE_PRECISION (long_long_integer_type_node))
3045 g77_longint_type_node = long_long_integer_type_node;
3046 g77_ulongint_type_node = long_long_unsigned_type_node;
3049 g77_longint_type_node = g77_ulongint_type_node = NULL_TREE;
3051 if (g77_longint_type_node != NULL_TREE)
3053 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_longint"),
3054 g77_longint_type_node));
3055 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_ulongint"),
3056 g77_ulongint_type_node));
3059 pedantic_lvalues = pedantic;
3061 make_fname_decl = c_make_fname_decl;
3062 start_fname_decls ();
3064 start_identifier_warnings ();
3066 /* Prepare to check format strings against argument lists. */
3067 init_function_format_info ();
3069 incomplete_decl_finalize_hook = finish_incomplete_decl;
3071 /* Record our roots. */
3073 ggc_add_tree_root (c_global_trees, CTI_MAX);
3074 ggc_add_root (&c_stmt_tree, 1, sizeof c_stmt_tree, mark_stmt_tree);
3075 ggc_add_tree_root (&c_scope_stmt_stack, 1);
3076 ggc_add_tree_root (&named_labels, 1);
3077 ggc_add_tree_root (&shadowed_labels, 1);
3078 ggc_add_root (¤t_binding_level, 1, sizeof current_binding_level,
3079 mark_binding_level);
3080 ggc_add_root (&label_level_chain, 1, sizeof label_level_chain,
3081 mark_binding_level);
3082 ggc_add_tree_root (&static_ctors, 1);
3083 ggc_add_tree_root (&static_dtors, 1);
3086 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3087 decl, NAME is the initialization string and TYPE_DEP indicates whether
3088 NAME depended on the type of the function. As we don't yet implement
3089 delayed emission of static data, we mark the decl as emitted
3090 so it is not placed in the output. Anything using it must therefore pull
3091 out the STRING_CST initializer directly. This does mean that these names
3092 are string merging candidates, which is wrong for C99's __func__. FIXME. */
3095 c_make_fname_decl (id, type_dep)
3099 const char *name = fname_as_string (type_dep);
3100 tree decl, type, init;
3101 size_t length = strlen (name);
3103 type = build_array_type
3104 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
3105 build_index_type (size_int (length)));
3107 decl = build_decl (VAR_DECL, id, type);
3108 /* We don't push the decl, so have to set its context here. */
3109 DECL_CONTEXT (decl) = current_function_decl;
3111 TREE_STATIC (decl) = 1;
3112 TREE_READONLY (decl) = 1;
3113 DECL_ARTIFICIAL (decl) = 1;
3115 init = build_string (length + 1, name);
3116 TREE_TYPE (init) = type;
3117 DECL_INITIAL (decl) = init;
3119 TREE_USED (decl) = 1;
3121 finish_decl (decl, init, NULL_TREE);
3126 /* Return a definition for a builtin function named NAME and whose data type
3127 is TYPE. TYPE should be a function type with argument types.
3128 FUNCTION_CODE tells later passes how to compile calls to this function.
3129 See tree.h for its possible values.
3131 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3132 the name to be called if we can't opencode the function. */
3135 builtin_function (name, type, function_code, class, library_name)
3139 enum built_in_class class;
3140 const char *library_name;
3142 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3143 DECL_EXTERNAL (decl) = 1;
3144 TREE_PUBLIC (decl) = 1;
3145 /* If -traditional, permit redefining a builtin function any way you like.
3146 (Though really, if the program redefines these functions,
3147 it probably won't work right unless compiled with -fno-builtin.) */
3148 if (flag_traditional && name[0] != '_')
3149 DECL_BUILT_IN_NONANSI (decl) = 1;
3151 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
3152 make_decl_rtl (decl, NULL);
3154 DECL_BUILT_IN_CLASS (decl) = class;
3155 DECL_FUNCTION_CODE (decl) = function_code;
3157 /* Warn if a function in the namespace for users
3158 is used without an occasion to consider it declared. */
3159 if (name[0] != '_' || name[1] != '_')
3160 C_DECL_ANTICIPATED (decl) = 1;
3165 /* Called when a declaration is seen that contains no names to declare.
3166 If its type is a reference to a structure, union or enum inherited
3167 from a containing scope, shadow that tag name for the current scope
3168 with a forward reference.
3169 If its type defines a new named structure or union
3170 or defines an enum, it is valid but we need not do anything here.
3171 Otherwise, it is an error. */
3174 shadow_tag (declspecs)
3177 shadow_tag_warned (declspecs, 0);
3181 shadow_tag_warned (declspecs, warned)
3184 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3191 pending_invalid_xref = 0;
3193 /* Remove the attributes from declspecs, since they will confuse the
3195 split_specs_attrs (declspecs, &specs, &attrs);
3197 for (link = specs; link; link = TREE_CHAIN (link))
3199 register tree value = TREE_VALUE (link);
3200 register enum tree_code code = TREE_CODE (value);
3202 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3203 /* Used to test also that TYPE_SIZE (value) != 0.
3204 That caused warning for `struct foo;' at top level in the file. */
3206 register tree name = lookup_tag_reverse (value);
3213 if (warned != 1 && code != ENUMERAL_TYPE)
3214 /* Empty unnamed enum OK */
3216 pedwarn ("unnamed struct/union that defines no instances");
3222 t = lookup_tag (code, name, current_binding_level, 1);
3226 t = make_node (code);
3233 if (!warned && ! in_system_header)
3235 warning ("useless keyword or type name in empty declaration");
3242 error ("two types specified in one empty declaration");
3247 pedwarn ("empty declaration");
3251 /* Construct an array declarator. EXPR is the expression inside [], or
3252 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
3253 to the pointer to which a parameter array is converted). STATIC_P is
3254 non-zero if "static" is inside the [], zero otherwise. VLA_UNSPEC_P
3255 is non-zero is the array is [*], a VLA of unspecified length which is
3256 nevertheless a complete type (not currently implemented by GCC),
3257 zero otherwise. The declarator is constructed as an ARRAY_REF
3258 (to be decoded by grokdeclarator), whose operand 0 is what's on the
3259 left of the [] (filled by in set_array_declarator_type) and operand 1
3260 is the expression inside; whose TREE_TYPE is the type qualifiers and
3261 which has TREE_STATIC set if "static" is used. */
3264 build_array_declarator (expr, quals, static_p, vla_unspec_p)
3271 decl = build_nt (ARRAY_REF, NULL_TREE, expr);
3272 TREE_TYPE (decl) = quals;
3273 TREE_STATIC (decl) = (static_p ? 1 : 0);
3274 if (pedantic && !flag_isoc99)
3276 if (static_p || quals != NULL_TREE)
3277 pedwarn ("ISO C89 does not support `static' or type qualifiers in parameter array declarators");
3279 pedwarn ("ISO C89 does not support `[*]' array declarators");
3282 warning ("GCC does not yet properly implement `[*]' array declarators");
3286 /* Set the type of an array declarator. DECL is the declarator, as
3287 constructed by build_array_declarator; TYPE is what appears on the left
3288 of the [] and goes in operand 0. ABSTRACT_P is non-zero if it is an
3289 abstract declarator, zero otherwise; this is used to reject static and
3290 type qualifiers in abstract declarators, where they are not in the
3294 set_array_declarator_type (decl, type, abstract_p)
3299 TREE_OPERAND (decl, 0) = type;
3300 if (abstract_p && (TREE_TYPE (decl) != NULL_TREE || TREE_STATIC (decl)))
3301 error ("static or type qualifiers in abstract declarator");
3305 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3308 groktypename (typename)
3311 if (TREE_CODE (typename) != TREE_LIST)
3313 return grokdeclarator (TREE_VALUE (typename),
3314 TREE_PURPOSE (typename),
3318 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3321 groktypename_in_parm_context (typename)
3324 if (TREE_CODE (typename) != TREE_LIST)
3326 return grokdeclarator (TREE_VALUE (typename),
3327 TREE_PURPOSE (typename),
3331 /* Decode a declarator in an ordinary declaration or data definition.
3332 This is called as soon as the type information and variable name
3333 have been parsed, before parsing the initializer if any.
3334 Here we create the ..._DECL node, fill in its type,
3335 and put it on the list of decls for the current context.
3336 The ..._DECL node is returned as the value.
3338 Exception: for arrays where the length is not specified,
3339 the type is left null, to be filled in by `finish_decl'.
3341 Function definitions do not come here; they go to start_function
3342 instead. However, external and forward declarations of functions
3343 do go through here. Structure field declarations are done by
3344 grokfield and not through here. */
3347 start_decl (declarator, declspecs, initialized, attributes, prefix_attributes)
3348 tree declarator, declspecs;
3350 tree attributes, prefix_attributes;
3352 register tree decl = grokdeclarator (declarator, declspecs,
3353 NORMAL, initialized);
3356 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3357 && MAIN_NAME_P (DECL_NAME (decl)))
3358 warning_with_decl (decl, "`%s' is usually a function");
3361 /* Is it valid for this decl to have an initializer at all?
3362 If not, set INITIALIZED to zero, which will indirectly
3363 tell `finish_decl' to ignore the initializer once it is parsed. */
3364 switch (TREE_CODE (decl))
3367 /* typedef foo = bar means give foo the same type as bar.
3368 We haven't parsed bar yet, so `finish_decl' will fix that up.
3369 Any other case of an initialization in a TYPE_DECL is an error. */
3370 if (pedantic || list_length (declspecs) > 1)
3372 error ("typedef `%s' is initialized",
3373 IDENTIFIER_POINTER (DECL_NAME (decl)));
3379 error ("function `%s' is initialized like a variable",
3380 IDENTIFIER_POINTER (DECL_NAME (decl)));
3385 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3386 error ("parameter `%s' is initialized",
3387 IDENTIFIER_POINTER (DECL_NAME (decl)));
3392 /* Don't allow initializations for incomplete types
3393 except for arrays which might be completed by the initialization. */
3395 /* This can happen if the array size is an undefined macro. We already
3396 gave a warning, so we don't need another one. */
3397 if (TREE_TYPE (decl) == error_mark_node)
3399 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3401 /* A complete type is ok if size is fixed. */
3403 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3404 || C_DECL_VARIABLE_SIZE (decl))
3406 error ("variable-sized object may not be initialized");
3410 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3412 error ("variable `%s' has initializer but incomplete type",
3413 IDENTIFIER_POINTER (DECL_NAME (decl)));
3416 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
3418 error ("elements of array `%s' have incomplete type",
3419 IDENTIFIER_POINTER (DECL_NAME (decl)));
3427 /* Seems redundant with grokdeclarator. */
3428 if (current_binding_level != global_binding_level
3429 && DECL_EXTERNAL (decl)
3430 && TREE_CODE (decl) != FUNCTION_DECL)
3431 warning ("declaration of `%s' has `extern' and is initialized",
3432 IDENTIFIER_POINTER (DECL_NAME (decl)));
3434 DECL_EXTERNAL (decl) = 0;
3435 if (current_binding_level == global_binding_level)
3436 TREE_STATIC (decl) = 1;
3438 /* Tell `pushdecl' this is an initialized decl
3439 even though we don't yet have the initializer expression.
3440 Also tell `finish_decl' it may store the real initializer. */
3441 DECL_INITIAL (decl) = error_mark_node;
3444 /* If this is a function declaration, write a record describing it to the
3445 prototypes file (if requested). */
3447 if (TREE_CODE (decl) == FUNCTION_DECL)
3448 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3450 /* ANSI specifies that a tentative definition which is not merged with
3451 a non-tentative definition behaves exactly like a definition with an
3452 initializer equal to zero. (Section 3.7.2)
3453 -fno-common gives strict ANSI behavior. Usually you don't want it.
3454 This matters only for variables with external linkage. */
3455 if (! flag_no_common || ! TREE_PUBLIC (decl))
3456 DECL_COMMON (decl) = 1;
3458 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
3459 SET_DEFAULT_DECL_ATTRIBUTES (decl, attributes);
3462 /* Set attributes here so if duplicate decl, will have proper attributes. */
3463 decl_attributes (decl, attributes, prefix_attributes);
3465 /* Add this decl to the current binding level.
3466 TEM may equal DECL or it may be a previous decl of the same name. */
3467 tem = pushdecl (decl);
3469 /* For a local variable, define the RTL now. */
3470 if (current_binding_level != global_binding_level
3471 /* But not if this is a duplicate decl
3472 and we preserved the rtl from the previous one
3473 (which may or may not happen). */
3474 && !DECL_RTL_SET_P (tem)
3475 && !DECL_CONTEXT (tem))
3477 if (TREE_TYPE (tem) != error_mark_node
3478 && COMPLETE_TYPE_P (TREE_TYPE (tem)))
3480 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3481 && DECL_INITIAL (tem) != 0)
3488 /* Finish processing of a declaration;
3489 install its initial value.
3490 If the length of an array type is not known before,
3491 it must be determined now, from the initial value, or it is an error. */
3494 finish_decl (decl, init, asmspec_tree)
3498 register tree type = TREE_TYPE (decl);
3499 int was_incomplete = (DECL_SIZE (decl) == 0);
3500 const char *asmspec = 0;
3502 /* If a name was specified, get the string. */
3504 asmspec = TREE_STRING_POINTER (asmspec_tree);
3506 /* If `start_decl' didn't like having an initialization, ignore it now. */
3507 if (init != 0 && DECL_INITIAL (decl) == 0)
3510 /* Don't crash if parm is initialized. */
3511 if (TREE_CODE (decl) == PARM_DECL)
3516 if (TREE_CODE (decl) != TYPE_DECL)
3517 store_init_value (decl, init);
3520 /* typedef foo = bar; store the type of bar as the type of foo. */
3521 TREE_TYPE (decl) = TREE_TYPE (init);
3522 DECL_INITIAL (decl) = init = 0;
3526 /* Deduce size of array from initialization, if not already known */
3527 if (TREE_CODE (type) == ARRAY_TYPE
3528 && TYPE_DOMAIN (type) == 0
3529 && TREE_CODE (decl) != TYPE_DECL)
3532 = (TREE_STATIC (decl)
3533 /* Even if pedantic, an external linkage array
3534 may have incomplete type at first. */
3535 ? pedantic && !TREE_PUBLIC (decl)
3536 : !DECL_EXTERNAL (decl));
3538 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3540 /* Get the completed type made by complete_array_type. */
3541 type = TREE_TYPE (decl);
3544 error_with_decl (decl, "initializer fails to determine size of `%s'");
3546 else if (failure == 2)
3549 error_with_decl (decl, "array size missing in `%s'");
3550 /* If a `static' var's size isn't known,
3551 make it extern as well as static, so it does not get
3553 If it is not `static', then do not mark extern;
3554 finish_incomplete_decl will give it a default size
3555 and it will get allocated. */
3556 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3557 DECL_EXTERNAL (decl) = 1;
3560 /* TYPE_MAX_VALUE is always one less than the number of elements
3561 in the array, because we start counting at zero. Therefore,
3562 warn only if the value is less than zero. */
3563 else if (pedantic && TYPE_DOMAIN (type) != 0
3564 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3565 error_with_decl (decl, "zero or negative size array `%s'");
3567 layout_decl (decl, 0);
3570 if (TREE_CODE (decl) == VAR_DECL)
3572 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
3573 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3574 layout_decl (decl, 0);
3576 if (DECL_SIZE (decl) == 0
3577 /* Don't give an error if we already gave one earlier. */
3578 && TREE_TYPE (decl) != error_mark_node
3579 && (TREE_STATIC (decl)
3581 /* A static variable with an incomplete type
3582 is an error if it is initialized.
3583 Also if it is not file scope.
3584 Otherwise, let it through, but if it is not `extern'
3585 then it may cause an error message later. */
3586 (DECL_INITIAL (decl) != 0
3587 || DECL_CONTEXT (decl) != 0)
3589 /* An automatic variable with an incomplete type
3591 !DECL_EXTERNAL (decl)))
3593 error_with_decl (decl, "storage size of `%s' isn't known");
3594 TREE_TYPE (decl) = error_mark_node;
3597 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3598 && DECL_SIZE (decl) != 0)
3600 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3601 constant_expression_warning (DECL_SIZE (decl));
3603 error_with_decl (decl, "storage size of `%s' isn't constant");
3606 if (TREE_USED (type))
3607 TREE_USED (decl) = 1;
3610 /* If this is a function and an assembler name is specified, it isn't
3611 builtin any more. Also reset DECL_RTL so we can give it its new
3613 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3615 DECL_BUILT_IN_CLASS (decl) = NOT_BUILT_IN;
3616 SET_DECL_RTL (decl, NULL_RTX);
3617 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
3620 /* Output the assembler code and/or RTL code for variables and functions,
3621 unless the type is an undefined structure or union.
3622 If not, it will get done when the type is completed. */
3624 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3626 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3627 maybe_objc_check_decl (decl);
3629 if (!DECL_CONTEXT (decl))
3631 if (DECL_INITIAL (decl) == NULL_TREE
3632 || DECL_INITIAL (decl) == error_mark_node)
3633 /* Don't output anything
3634 when a tentative file-scope definition is seen.
3635 But at end of compilation, do output code for them. */
3636 DECL_DEFER_OUTPUT (decl) = 1;
3637 rest_of_decl_compilation (decl, asmspec,
3638 (DECL_CONTEXT (decl) == 0
3639 || TREE_ASM_WRITTEN (decl)), 0);
3643 /* This is a local variable. If there is an ASMSPEC, the
3644 user has requested that we handle it specially. */
3647 /* In conjunction with an ASMSPEC, the `register'
3648 keyword indicates that we should place the variable
3649 in a particular register. */
3650 if (DECL_REGISTER (decl))
3651 DECL_C_HARD_REGISTER (decl) = 1;
3653 /* If this is not a static variable, issue a warning.
3654 It doesn't make any sense to give an ASMSPEC for an
3655 ordinary, non-register local variable. Historically,
3656 GCC has accepted -- but ignored -- the ASMSPEC in
3658 if (TREE_CODE (decl) == VAR_DECL
3659 && !DECL_REGISTER (decl)
3660 && !TREE_STATIC (decl))
3661 warning_with_decl (decl,
3662 "ignoring asm-specifier for non-static local variable `%s'");
3664 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
3667 add_decl_stmt (decl);
3670 if (DECL_CONTEXT (decl) != 0)
3672 /* Recompute the RTL of a local array now
3673 if it used to be an incomplete type. */
3675 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3677 /* If we used it already as memory, it must stay in memory. */
3678 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3679 /* If it's still incomplete now, no init will save it. */
3680 if (DECL_SIZE (decl) == 0)
3681 DECL_INITIAL (decl) = 0;
3686 if (TREE_CODE (decl) == TYPE_DECL)
3688 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3689 maybe_objc_check_decl (decl);
3690 rest_of_decl_compilation (decl, NULL, DECL_CONTEXT (decl) == 0, 0);
3693 /* At the end of a declaration, throw away any variable type sizes
3694 of types defined inside that declaration. There is no use
3695 computing them in the following function definition. */
3696 if (current_binding_level == global_binding_level)
3697 get_pending_sizes ();
3700 /* If DECL has a cleanup, build and return that cleanup here.
3701 This is a callback called by expand_expr. */
3704 maybe_build_cleanup (decl)
3705 tree decl ATTRIBUTE_UNUSED;
3707 /* There are no cleanups in C. */
3711 /* Given a parsed parameter declaration,
3712 decode it into a PARM_DECL and push that on the current binding level.
3713 Also, for the sake of forward parm decls,
3714 record the given order of parms in `parm_order'. */
3717 push_parm_decl (parm)
3721 int old_immediate_size_expand = immediate_size_expand;
3722 /* Don't try computing parm sizes now -- wait till fn is called. */
3723 immediate_size_expand = 0;
3725 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3726 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3727 decl_attributes (decl, TREE_VALUE (TREE_VALUE (parm)),
3728 TREE_PURPOSE (TREE_VALUE (parm)));
3731 if (DECL_NAME (decl))
3734 olddecl = lookup_name (DECL_NAME (decl));
3735 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3736 pedwarn_with_decl (decl,
3737 "ANSI C forbids parameter `%s' shadowing typedef");
3741 decl = pushdecl (decl);
3743 immediate_size_expand = old_immediate_size_expand;
3745 current_binding_level->parm_order
3746 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3748 /* Add this decl to the current binding level. */
3749 finish_decl (decl, NULL_TREE, NULL_TREE);
3752 /* Clear the given order of parms in `parm_order'.
3753 Used at start of parm list,
3754 and also at semicolon terminating forward decls. */
3759 current_binding_level->parm_order = NULL_TREE;
3762 /* Make TYPE a complete type based on INITIAL_VALUE.
3763 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3764 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3767 complete_array_type (type, initial_value, do_default)
3772 register tree maxindex = NULL_TREE;
3777 /* Note MAXINDEX is really the maximum index,
3778 one less than the size. */
3779 if (TREE_CODE (initial_value) == STRING_CST)
3782 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3783 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3786 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3788 tree elts = CONSTRUCTOR_ELTS (initial_value);
3789 maxindex = build_int_2 (-1, -1);
3790 for (; elts; elts = TREE_CHAIN (elts))
3792 if (TREE_PURPOSE (elts))
3793 maxindex = TREE_PURPOSE (elts);
3795 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3796 maxindex, integer_one_node));
3798 maxindex = copy_node (maxindex);
3802 /* Make an error message unless that happened already. */
3803 if (initial_value != error_mark_node)
3806 /* Prevent further error messages. */
3807 maxindex = build_int_2 (0, 0);
3814 maxindex = build_int_2 (0, 0);
3820 TYPE_DOMAIN (type) = build_index_type (maxindex);
3821 if (!TREE_TYPE (maxindex))
3822 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3825 /* Lay out the type now that we can get the real answer. */
3832 /* Given declspecs and a declarator,
3833 determine the name and type of the object declared
3834 and construct a ..._DECL node for it.
3835 (In one case we can return a ..._TYPE node instead.
3836 For invalid input we sometimes return 0.)
3838 DECLSPECS is a chain of tree_list nodes whose value fields
3839 are the storage classes and type specifiers.
3841 DECL_CONTEXT says which syntactic context this declaration is in:
3842 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3843 FUNCDEF for a function definition. Like NORMAL but a few different
3844 error messages in each case. Return value may be zero meaning
3845 this definition is too screwy to try to parse.
3846 PARM for a parameter declaration (either within a function prototype
3847 or before a function body). Make a PARM_DECL, or return void_type_node.
3848 TYPENAME if for a typename (in a cast or sizeof).
3849 Don't make a DECL node; just return the ..._TYPE node.
3850 FIELD for a struct or union field; make a FIELD_DECL.
3851 BITFIELD for a field with specified width.
3852 INITIALIZED is 1 if the decl has an initializer.
3854 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3855 It may also be so in the PARM case, for a prototype where the
3856 argument type is specified but not the name.
3858 This function is where the complicated C meanings of `static'
3859 and `extern' are interpreted. */
3862 grokdeclarator (declarator, declspecs, decl_context, initialized)
3865 enum decl_context decl_context;
3870 tree type = NULL_TREE;
3875 int type_quals = TYPE_UNQUALIFIED;
3877 int explicit_int = 0;
3878 int explicit_char = 0;
3879 int defaulted_int = 0;
3880 tree typedef_decl = 0;
3882 tree typedef_type = 0;
3883 int funcdef_flag = 0;
3884 enum tree_code innermost_code = ERROR_MARK;
3886 int size_varies = 0;
3887 tree decl_machine_attr = NULL_TREE;
3888 tree array_ptr_quals = NULL_TREE;
3889 int array_parm_static = 0;
3891 if (decl_context == BITFIELD)
3892 bitfield = 1, decl_context = FIELD;
3894 if (decl_context == FUNCDEF)
3895 funcdef_flag = 1, decl_context = NORMAL;
3897 /* Look inside a declarator for the name being declared
3898 and get it as a string, for an error message. */
3900 register tree decl = declarator;
3904 switch (TREE_CODE (decl))
3909 innermost_code = TREE_CODE (decl);
3910 decl = TREE_OPERAND (decl, 0);
3913 case IDENTIFIER_NODE:
3914 name = IDENTIFIER_POINTER (decl);
3925 /* A function definition's declarator must have the form of
3926 a function declarator. */
3928 if (funcdef_flag && innermost_code != CALL_EXPR)
3931 /* Anything declared one level down from the top level
3932 must be one of the parameters of a function
3933 (because the body is at least two levels down). */
3935 /* If this looks like a function definition, make it one,
3936 even if it occurs where parms are expected.
3937 Then store_parm_decls will reject it and not use it as a parm. */
3938 if (decl_context == NORMAL && !funcdef_flag
3939 && current_binding_level->parm_flag)
3940 decl_context = PARM;
3942 /* Look through the decl specs and record which ones appear.
3943 Some typespecs are defined as built-in typenames.
3944 Others, the ones that are modifiers of other types,
3945 are represented by bits in SPECBITS: set the bits for
3946 the modifiers that appear. Storage class keywords are also in SPECBITS.
3948 If there is a typedef name or a type, store the type in TYPE.
3949 This includes builtin typedefs such as `int'.
3951 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3952 and did not come from a user typedef.
3954 Set LONGLONG if `long' is mentioned twice. */
3956 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3958 register tree id = TREE_VALUE (spec);
3960 if (id == ridpointers[(int) RID_INT])
3962 if (id == ridpointers[(int) RID_CHAR])
3965 if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
3967 enum rid i = C_RID_CODE (id);
3968 if ((int) i <= (int) RID_LAST_MODIFIER)
3970 if (i == RID_LONG && (specbits & (1 << (int) i)))
3973 error ("`long long long' is too long for GCC");
3976 if (pedantic && !flag_isoc99 && ! in_system_header
3978 pedwarn ("ISO C89 does not support `long long'");
3982 else if (specbits & (1 << (int) i))
3983 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3984 specbits |= 1 << (int) i;
3989 error ("two or more data types in declaration of `%s'", name);
3990 /* Actual typedefs come to us as TYPE_DECL nodes. */
3991 else if (TREE_CODE (id) == TYPE_DECL)
3993 type = TREE_TYPE (id);
3994 decl_machine_attr = DECL_MACHINE_ATTRIBUTES (id);
3997 /* Built-in types come as identifiers. */
3998 else if (TREE_CODE (id) == IDENTIFIER_NODE)
4000 register tree t = lookup_name (id);
4001 if (TREE_TYPE (t) == error_mark_node)
4003 else if (!t || TREE_CODE (t) != TYPE_DECL)
4004 error ("`%s' fails to be a typedef or built in type",
4005 IDENTIFIER_POINTER (id));
4008 type = TREE_TYPE (t);
4012 else if (TREE_CODE (id) != ERROR_MARK)
4019 typedef_type = type;
4021 size_varies = C_TYPE_VARIABLE_SIZE (type);
4023 /* No type at all: default to `int', and set DEFAULTED_INT
4024 because it was not a user-defined typedef. */
4028 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4029 | (1 << (int) RID_SIGNED)
4030 | (1 << (int) RID_UNSIGNED)
4031 | (1 << (int) RID_COMPLEX))))
4032 /* Don't warn about typedef foo = bar. */
4033 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
4034 && ! in_system_header)
4036 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
4037 and this is a function, or if -Wimplicit; prefer the former
4038 warning since it is more explicit. */
4039 if ((warn_implicit_int || warn_return_type || flag_isoc99)
4041 warn_about_return_type = 1;
4042 else if (warn_implicit_int || flag_isoc99)
4043 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
4048 type = integer_type_node;
4051 /* Now process the modifiers that were specified
4052 and check for invalid combinations. */
4054 /* Long double is a special combination. */
4056 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4057 && TYPE_MAIN_VARIANT (type) == double_type_node)
4059 specbits &= ~(1 << (int) RID_LONG);
4060 type = long_double_type_node;
4063 /* Check all other uses of type modifiers. */
4065 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4066 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4070 if ((specbits & 1 << (int) RID_LONG)
4071 && (specbits & 1 << (int) RID_SHORT))
4072 error ("both long and short specified for `%s'", name);
4073 else if (((specbits & 1 << (int) RID_LONG)
4074 || (specbits & 1 << (int) RID_SHORT))
4076 error ("long or short specified with char for `%s'", name);
4077 else if (((specbits & 1 << (int) RID_LONG)
4078 || (specbits & 1 << (int) RID_SHORT))
4079 && TREE_CODE (type) == REAL_TYPE)
4081 static int already = 0;
4083 error ("long or short specified with floating type for `%s'", name);
4084 if (! already && ! pedantic)
4086 error ("the only valid combination is `long double'");
4090 else if ((specbits & 1 << (int) RID_SIGNED)
4091 && (specbits & 1 << (int) RID_UNSIGNED))
4092 error ("both signed and unsigned specified for `%s'", name);
4093 else if (TREE_CODE (type) != INTEGER_TYPE)
4094 error ("long, short, signed or unsigned invalid for `%s'", name);
4098 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4100 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4102 if (flag_pedantic_errors)
4107 /* Discard the type modifiers if they are invalid. */
4110 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4111 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4116 if ((specbits & (1 << (int) RID_COMPLEX))
4117 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4119 error ("complex invalid for `%s'", name);
4120 specbits &= ~(1 << (int) RID_COMPLEX);
4123 /* Decide whether an integer type is signed or not.
4124 Optionally treat bitfields as signed by default. */
4125 if (specbits & 1 << (int) RID_UNSIGNED
4126 /* Traditionally, all bitfields are unsigned. */
4127 || (bitfield && flag_traditional
4128 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4129 || (bitfield && ! flag_signed_bitfields
4130 && (explicit_int || defaulted_int || explicit_char
4131 /* A typedef for plain `int' without `signed'
4132 can be controlled just like plain `int'. */
4133 || ! (typedef_decl != 0
4134 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4135 && TREE_CODE (type) != ENUMERAL_TYPE
4136 && !(specbits & 1 << (int) RID_SIGNED)))
4139 type = long_long_unsigned_type_node;
4140 else if (specbits & 1 << (int) RID_LONG)
4141 type = long_unsigned_type_node;
4142 else if (specbits & 1 << (int) RID_SHORT)
4143 type = short_unsigned_type_node;
4144 else if (type == char_type_node)
4145 type = unsigned_char_type_node;
4146 else if (typedef_decl)
4147 type = unsigned_type (type);
4149 type = unsigned_type_node;
4151 else if ((specbits & 1 << (int) RID_SIGNED)
4152 && type == char_type_node)
4153 type = signed_char_type_node;
4155 type = long_long_integer_type_node;
4156 else if (specbits & 1 << (int) RID_LONG)
4157 type = long_integer_type_node;
4158 else if (specbits & 1 << (int) RID_SHORT)
4159 type = short_integer_type_node;
4161 if (specbits & 1 << (int) RID_COMPLEX)
4163 if (pedantic && !flag_isoc99)
4164 pedwarn ("ISO C89 does not support complex types");
4165 /* If we just have "complex", it is equivalent to
4166 "complex double", but if any modifiers at all are specified it is
4167 the complex form of TYPE. E.g, "complex short" is
4168 "complex short int". */
4170 if (defaulted_int && ! longlong
4171 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4172 | (1 << (int) RID_SIGNED)
4173 | (1 << (int) RID_UNSIGNED))))
4176 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
4177 type = complex_double_type_node;
4179 else if (type == integer_type_node)
4182 pedwarn ("ISO C does not support complex integer types");
4183 type = complex_integer_type_node;
4185 else if (type == float_type_node)
4186 type = complex_float_type_node;
4187 else if (type == double_type_node)
4188 type = complex_double_type_node;
4189 else if (type == long_double_type_node)
4190 type = complex_long_double_type_node;
4194 pedwarn ("ISO C does not support complex integer types");
4195 type = build_complex_type (type);
4199 /* Figure out the type qualifiers for the declaration. There are
4200 two ways a declaration can become qualified. One is something
4201 like `const int i' where the `const' is explicit. Another is
4202 something like `typedef const int CI; CI i' where the type of the
4203 declaration contains the `const'. */
4204 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4205 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
4206 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4207 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4208 if (constp > 1 && ! flag_isoc99)
4209 pedwarn ("duplicate `const'");
4210 if (restrictp > 1 && ! flag_isoc99)
4211 pedwarn ("duplicate `restrict'");
4212 if (volatilep > 1 && ! flag_isoc99)
4213 pedwarn ("duplicate `volatile'");
4214 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
4215 type = TYPE_MAIN_VARIANT (type);
4216 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4217 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4218 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4220 /* Warn if two storage classes are given. Default to `auto'. */
4225 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4226 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4227 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4228 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4229 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4231 /* Warn about storage classes that are invalid for certain
4232 kinds of declarations (parameters, typenames, etc.). */
4235 error ("multiple storage classes in declaration of `%s'", name);
4236 else if (funcdef_flag
4238 & ((1 << (int) RID_REGISTER)
4239 | (1 << (int) RID_AUTO)
4240 | (1 << (int) RID_TYPEDEF))))
4242 if (specbits & 1 << (int) RID_AUTO
4243 && (pedantic || current_binding_level == global_binding_level))
4244 pedwarn ("function definition declared `auto'");
4245 if (specbits & 1 << (int) RID_REGISTER)
4246 error ("function definition declared `register'");
4247 if (specbits & 1 << (int) RID_TYPEDEF)
4248 error ("function definition declared `typedef'");
4249 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4250 | (1 << (int) RID_AUTO));
4252 else if (decl_context != NORMAL && nclasses > 0)
4254 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4258 switch (decl_context)
4261 error ("storage class specified for structure field `%s'",
4265 error ("storage class specified for parameter `%s'", name);
4268 error ("storage class specified for typename");
4271 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4272 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4273 | (1 << (int) RID_EXTERN));
4276 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4278 /* `extern' with initialization is invalid if not at top level. */
4279 if (current_binding_level == global_binding_level)
4280 warning ("`%s' initialized and declared `extern'", name);
4282 error ("`%s' has both `extern' and initializer", name);
4284 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4285 && current_binding_level != global_binding_level)
4286 error ("nested function `%s' declared `extern'", name);
4287 else if (current_binding_level == global_binding_level
4288 && specbits & (1 << (int) RID_AUTO))
4289 error ("top-level declaration of `%s' specifies `auto'", name);
4292 /* Now figure out the structure of the declarator proper.
4293 Descend through it, creating more complex types, until we reach
4294 the declared identifier (or NULL_TREE, in an absolute declarator). */
4296 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4298 if (type == error_mark_node)
4300 declarator = TREE_OPERAND (declarator, 0);
4304 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4305 an INDIRECT_REF (for *...),
4306 a CALL_EXPR (for ...(...)),
4307 an identifier (for the name being declared)
4308 or a null pointer (for the place in an absolute declarator
4309 where the name was omitted).
4310 For the last two cases, we have just exited the loop.
4312 At this point, TYPE is the type of elements of an array,
4313 or for a function to return, or for a pointer to point to.
4314 After this sequence of ifs, TYPE is the type of the
4315 array or function or pointer, and DECLARATOR has had its
4316 outermost layer removed. */
4318 if (array_ptr_quals != NULL_TREE || array_parm_static)
4320 /* Only the innermost declarator (making a parameter be of
4321 array type which is converted to pointer type)
4322 may have static or type qualifiers. */
4323 error ("static or type qualifiers in non-parameter array declarator");
4324 array_ptr_quals = NULL_TREE;
4325 array_parm_static = 0;
4328 if (TREE_CODE (declarator) == ARRAY_REF)
4330 register tree itype = NULL_TREE;
4331 register tree size = TREE_OPERAND (declarator, 1);
4332 /* The index is a signed object `sizetype' bits wide. */
4333 tree index_type = signed_type (sizetype);
4335 array_ptr_quals = TREE_TYPE (declarator);
4336 array_parm_static = TREE_STATIC (declarator);
4338 declarator = TREE_OPERAND (declarator, 0);
4340 /* Check for some types that there cannot be arrays of. */
4342 if (VOID_TYPE_P (type))
4344 error ("declaration of `%s' as array of voids", name);
4345 type = error_mark_node;
4348 if (TREE_CODE (type) == FUNCTION_TYPE)
4350 error ("declaration of `%s' as array of functions", name);
4351 type = error_mark_node;
4354 if (size == error_mark_node)
4355 type = error_mark_node;
4357 if (type == error_mark_node)
4360 /* If size was specified, set ITYPE to a range-type for that size.
4361 Otherwise, ITYPE remains null. finish_decl may figure it out
4362 from an initial value. */
4366 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4367 STRIP_TYPE_NOPS (size);
4369 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
4370 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
4372 error ("size of array `%s' has non-integer type", name);
4373 size = integer_one_node;
4376 if (pedantic && integer_zerop (size))
4377 pedwarn ("ISO C forbids zero-size array `%s'", name);
4379 if (TREE_CODE (size) == INTEGER_CST)
4381 constant_expression_warning (size);
4382 if (tree_int_cst_sgn (size) < 0)
4384 error ("size of array `%s' is negative", name);
4385 size = integer_one_node;
4390 /* Make sure the array size remains visibly nonconstant
4391 even if it is (eg) a const variable with known value. */
4396 if (TREE_CONSTANT (size))
4397 pedwarn ("ISO C89 forbids array `%s' whose size can't be evaluated",
4400 pedwarn ("ISO C89 forbids variable-size array `%s'",
4405 if (integer_zerop (size))
4407 /* A zero-length array cannot be represented with an
4408 unsigned index type, which is what we'll get with
4409 build_index_type. Create an open-ended range instead. */
4410 itype = build_range_type (sizetype, size, NULL_TREE);
4414 /* Compute the maximum valid index, that is, size - 1.
4415 Do the calculation in index_type, so that if it is
4416 a variable the computations will be done in the
4418 itype = fold (build (MINUS_EXPR, index_type,
4419 convert (index_type, size),
4420 convert (index_type, size_one_node)));
4422 /* If that overflowed, the array is too big.
4423 ??? While a size of INT_MAX+1 technically shouldn't
4424 cause an overflow (because we subtract 1), the overflow
4425 is recorded during the conversion to index_type, before
4426 the subtraction. Handling this case seems like an
4427 unnecessary complication. */
4428 if (TREE_OVERFLOW (itype))
4430 error ("size of array `%s' is too large", name);
4431 type = error_mark_node;
4436 itype = variable_size (itype);
4437 itype = build_index_type (itype);
4440 else if (decl_context == FIELD)
4442 /* ??? Need to check somewhere that this is a structure
4443 and not a union, that this field is last, and that
4444 this structure has at least one other named member. */
4446 if (pedantic && !flag_isoc99 && !in_system_header)
4447 pedwarn ("ISO C89 does not support flexible array members");
4449 /* ISO C99 Flexible array members are effectively identical
4450 to GCC's zero-length array extension. */
4451 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4454 /* If pedantic, complain about arrays of incomplete types. */
4456 if (pedantic && !COMPLETE_TYPE_P (type))
4457 pedwarn ("array type has incomplete element type");
4460 /* We shouldn't have a function type here at all!
4461 Functions aren't allowed as array elements. */
4462 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4463 && (constp || volatilep))
4464 pedwarn ("ANSI C forbids const or volatile function types");
4467 /* Build the array type itself, then merge any constancy or
4468 volatility into the target type. We must do it in this order
4469 to ensure that the TYPE_MAIN_VARIANT field of the array type
4470 is set correctly. */
4472 type = build_array_type (type, itype);
4474 type = c_build_qualified_type (type, type_quals);
4477 C_TYPE_VARIABLE_SIZE (type) = 1;
4479 /* The GCC extension for zero-length arrays differs from
4480 ISO flexible array members in that sizeof yields zero. */
4481 if (size && integer_zerop (size))
4484 TYPE_SIZE (type) = bitsize_zero_node;
4485 TYPE_SIZE_UNIT (type) = size_zero_node;
4487 if (decl_context != PARM
4488 && (array_ptr_quals != NULL_TREE || array_parm_static))
4490 error ("static or type qualifiers in non-parameter array declarator");
4491 array_ptr_quals = NULL_TREE;
4492 array_parm_static = 0;
4495 else if (TREE_CODE (declarator) == CALL_EXPR)
4499 /* Declaring a function type.
4500 Make sure we have a valid type for the function to return. */
4501 if (type == error_mark_node)
4506 /* Warn about some types functions can't return. */
4508 if (TREE_CODE (type) == FUNCTION_TYPE)
4510 error ("`%s' declared as function returning a function", name);
4511 type = integer_type_node;
4513 if (TREE_CODE (type) == ARRAY_TYPE)
4515 error ("`%s' declared as function returning an array", name);
4516 type = integer_type_node;
4519 #ifndef TRADITIONAL_RETURN_FLOAT
4520 /* Traditionally, declaring return type float means double. */
4522 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4523 type = double_type_node;
4524 #endif /* TRADITIONAL_RETURN_FLOAT */
4526 /* Construct the function type and go to the next
4527 inner layer of declarator. */
4529 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4531 /* Say it's a definition
4532 only for the CALL_EXPR
4533 closest to the identifier. */
4534 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4535 /* Type qualifiers before the return type of the function
4536 qualify the return type, not the function type. */
4539 /* Type qualifiers on a function return type are normally
4540 permitted by the standard but have no effect, so give a
4541 warning at -W. Qualifiers on a void return type have
4542 meaning as a GNU extension, and are banned on function
4543 definitions in ISO C. FIXME: strictly we shouldn't
4544 pedwarn for qualified void return types except on function
4545 definitions, but not doing so could lead to the undesirable
4546 state of a "volatile void" function return type not being
4547 warned about, and a use of the function being compiled
4548 with GNU semantics, with no diagnostics under -pedantic. */
4549 if (VOID_TYPE_P (type) && pedantic && !in_system_header)
4550 pedwarn ("ISO C forbids qualified void function return type");
4551 else if (extra_warnings
4552 && !(VOID_TYPE_P (type)
4553 && type_quals == TYPE_QUAL_VOLATILE))
4554 warning ("type qualifiers ignored on function return type");
4556 type = c_build_qualified_type (type, type_quals);
4558 type_quals = TYPE_UNQUALIFIED;
4560 type = build_function_type (type, arg_types);
4561 declarator = TREE_OPERAND (declarator, 0);
4563 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4564 the formal parameter list of this FUNCTION_TYPE to point to
4565 the FUNCTION_TYPE node itself. */
4570 for (link = last_function_parm_tags;
4572 link = TREE_CHAIN (link))
4573 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4576 else if (TREE_CODE (declarator) == INDIRECT_REF)
4578 /* Merge any constancy or volatility into the target type
4581 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4583 pedwarn ("ISO C forbids qualified function types");
4585 type = c_build_qualified_type (type, type_quals);
4586 type_quals = TYPE_UNQUALIFIED;
4589 type = build_pointer_type (type);
4591 /* Process a list of type modifier keywords
4592 (such as const or volatile) that were given inside the `*'. */
4594 if (TREE_TYPE (declarator))
4596 register tree typemodlist;
4602 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4603 typemodlist = TREE_CHAIN (typemodlist))
4605 tree qualifier = TREE_VALUE (typemodlist);
4607 if (C_IS_RESERVED_WORD (qualifier))
4609 if (C_RID_CODE (qualifier) == RID_CONST)
4611 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4613 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4623 error ("invalid type modifier within pointer declarator");
4624 if (constp > 1 && ! flag_isoc99)
4625 pedwarn ("duplicate `const'");
4626 if (volatilep > 1 && ! flag_isoc99)
4627 pedwarn ("duplicate `volatile'");
4628 if (restrictp > 1 && ! flag_isoc99)
4629 pedwarn ("duplicate `restrict'");
4631 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4632 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4633 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4636 declarator = TREE_OPERAND (declarator, 0);
4643 /* Now TYPE has the actual type. */
4645 /* Did array size calculations overflow? */
4647 if (TREE_CODE (type) == ARRAY_TYPE
4648 && COMPLETE_TYPE_P (type)
4649 && TREE_OVERFLOW (TYPE_SIZE (type)))
4651 error ("size of array `%s' is too large", name);
4652 /* If we proceed with the array type as it is, we'll eventully
4653 crash in tree_low_cst(). */
4654 type = error_mark_node;
4657 /* If this is declaring a typedef name, return a TYPE_DECL. */
4659 if (specbits & (1 << (int) RID_TYPEDEF))
4662 /* Note that the grammar rejects storage classes
4663 in typenames, fields or parameters */
4664 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4666 pedwarn ("ISO C forbids qualified function types");
4668 type = c_build_qualified_type (type, type_quals);
4669 decl = build_decl (TYPE_DECL, declarator, type);
4670 if ((specbits & (1 << (int) RID_SIGNED))
4671 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4672 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4676 /* Detect the case of an array type of unspecified size
4677 which came, as such, direct from a typedef name.
4678 We must copy the type, so that each identifier gets
4679 a distinct type, so that each identifier's size can be
4680 controlled separately by its own initializer. */
4682 if (type != 0 && typedef_type != 0
4683 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4684 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4686 type = build_array_type (TREE_TYPE (type), 0);
4688 C_TYPE_VARIABLE_SIZE (type) = 1;
4691 /* If this is a type name (such as, in a cast or sizeof),
4692 compute the type and return it now. */
4694 if (decl_context == TYPENAME)
4696 /* Note that the grammar rejects storage classes
4697 in typenames, fields or parameters */
4698 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4700 pedwarn ("ISO C forbids const or volatile function types");
4702 type = c_build_qualified_type (type, type_quals);
4706 /* Aside from typedefs and type names (handle above),
4707 `void' at top level (not within pointer)
4708 is allowed only in public variables.
4709 We don't complain about parms either, but that is because
4710 a better error message can be made later. */
4712 if (VOID_TYPE_P (type) && decl_context != PARM
4713 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4714 && ((specbits & (1 << (int) RID_EXTERN))
4715 || (current_binding_level == global_binding_level
4717 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4719 error ("variable or field `%s' declared void", name);
4720 type = integer_type_node;
4723 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4724 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4729 if (decl_context == PARM)
4731 tree type_as_written = type;
4734 /* A parameter declared as an array of T is really a pointer to T.
4735 One declared as a function is really a pointer to a function. */
4737 if (TREE_CODE (type) == ARRAY_TYPE)
4739 /* Transfer const-ness of array into that of type pointed to. */
4740 type = TREE_TYPE (type);
4742 type = c_build_qualified_type (type, type_quals);
4743 type = build_pointer_type (type);
4744 type_quals = TYPE_UNQUALIFIED;
4745 if (array_ptr_quals)
4747 tree new_ptr_quals, new_ptr_attrs;
4749 split_specs_attrs (array_ptr_quals, &new_ptr_quals, &new_ptr_attrs);
4750 /* We don't yet implement attributes in this context. */
4751 if (new_ptr_attrs != NULL_TREE)
4752 warning ("attributes in parameter array declarator ignored");
4757 for (; new_ptr_quals; new_ptr_quals = TREE_CHAIN (new_ptr_quals))
4759 tree qualifier = TREE_VALUE (new_ptr_quals);
4761 if (C_IS_RESERVED_WORD (qualifier))
4763 if (C_RID_CODE (qualifier) == RID_CONST)
4765 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4767 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4777 error ("invalid type modifier within array declarator");
4779 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4780 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4781 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4785 else if (TREE_CODE (type) == FUNCTION_TYPE)
4787 if (pedantic && type_quals)
4788 pedwarn ("ISO C forbids qualified function types");
4790 type = c_build_qualified_type (type, type_quals);
4791 type = build_pointer_type (type);
4792 type_quals = TYPE_UNQUALIFIED;
4795 decl = build_decl (PARM_DECL, declarator, type);
4797 C_DECL_VARIABLE_SIZE (decl) = 1;
4799 /* Compute the type actually passed in the parmlist,
4800 for the case where there is no prototype.
4801 (For example, shorts and chars are passed as ints.)
4802 When there is a prototype, this is overridden later. */
4804 if (type == error_mark_node)
4805 promoted_type = type;
4808 promoted_type = simple_type_promotes_to (type);
4809 if (! promoted_type)
4810 promoted_type = type;
4813 DECL_ARG_TYPE (decl) = promoted_type;
4814 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4816 else if (decl_context == FIELD)
4818 /* Structure field. It may not be a function. */
4820 if (TREE_CODE (type) == FUNCTION_TYPE)
4822 error ("field `%s' declared as a function", name);
4823 type = build_pointer_type (type);
4825 else if (TREE_CODE (type) != ERROR_MARK
4826 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4828 error ("field `%s' has incomplete type", name);
4829 type = error_mark_node;
4831 /* Move type qualifiers down to element of an array. */
4832 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4834 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4836 TYPE_DOMAIN (type));
4838 /* Leave the field const or volatile as well. */
4839 type_quals = TYPE_UNQUALIFIED;
4842 decl = build_decl (FIELD_DECL, declarator, type);
4843 DECL_NONADDRESSABLE_P (decl) = bitfield;
4846 C_DECL_VARIABLE_SIZE (decl) = 1;
4848 else if (TREE_CODE (type) == FUNCTION_TYPE)
4850 /* Every function declaration is "external"
4851 except for those which are inside a function body
4852 in which `auto' is used.
4853 That is a case not specified by ANSI C,
4854 and we use it for forward declarations for nested functions. */
4855 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4856 || current_binding_level == global_binding_level);
4858 if (specbits & (1 << (int) RID_AUTO)
4859 && (pedantic || current_binding_level == global_binding_level))
4860 pedwarn ("invalid storage class for function `%s'", name);
4861 if (specbits & (1 << (int) RID_REGISTER))
4862 error ("invalid storage class for function `%s'", name);
4863 /* Function declaration not at top level.
4864 Storage classes other than `extern' are not allowed
4865 and `extern' makes no difference. */
4866 if (current_binding_level != global_binding_level
4867 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4869 pedwarn ("invalid storage class for function `%s'", name);
4871 decl = build_decl (FUNCTION_DECL, declarator, type);
4872 decl = build_decl_attribute_variant (decl, decl_machine_attr);
4874 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4875 pedwarn ("ISO C forbids qualified function types");
4877 /* GNU C interprets a `volatile void' return type to indicate
4878 that the function does not return. */
4879 if ((type_quals & TYPE_QUAL_VOLATILE)
4880 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4881 warning ("`noreturn' function returns non-void value");
4884 DECL_EXTERNAL (decl) = 1;
4885 /* Record absence of global scope for `static' or `auto'. */
4887 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4889 /* Record presence of `inline', if it is reasonable. */
4892 if (MAIN_NAME_P (declarator))
4893 warning ("cannot inline function `main'");
4895 /* Assume that otherwise the function can be inlined. */
4896 DECL_INLINE (decl) = 1;
4898 if (specbits & (1 << (int) RID_EXTERN))
4899 current_extern_inline = 1;
4904 /* It's a variable. */
4905 /* An uninitialized decl with `extern' is a reference. */
4906 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4908 /* Move type qualifiers down to element of an array. */
4909 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4911 int saved_align = TYPE_ALIGN(type);
4912 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4914 TYPE_DOMAIN (type));
4915 TYPE_ALIGN (type) = saved_align;
4916 #if 0 /* Leave the variable const or volatile as well. */
4917 type_quals = TYPE_UNQUALIFIED;
4921 decl = build_decl (VAR_DECL, declarator, type);
4923 C_DECL_VARIABLE_SIZE (decl) = 1;
4926 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4928 DECL_EXTERNAL (decl) = extern_ref;
4929 /* At top level, the presence of a `static' or `register' storage
4930 class specifier, or the absence of all storage class specifiers
4931 makes this declaration a definition (perhaps tentative). Also,
4932 the absence of both `static' and `register' makes it public. */
4933 if (current_binding_level == global_binding_level)
4937 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
4938 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
4940 /* Not at top level, only `static' makes a static definition. */
4943 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4944 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
4948 /* Record `register' declaration for warnings on &
4949 and in case doing stupid register allocation. */
4951 if (specbits & (1 << (int) RID_REGISTER))
4952 DECL_REGISTER (decl) = 1;
4954 /* Record constancy and volatility. */
4955 c_apply_type_quals_to_decl (type_quals, decl);
4957 /* If a type has volatile components, it should be stored in memory.
4958 Otherwise, the fact that those components are volatile
4959 will be ignored, and would even crash the compiler. */
4960 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4961 mark_addressable (decl);
4967 /* Decode the parameter-list info for a function type or function definition.
4968 The argument is the value returned by `get_parm_info' (or made in parse.y
4969 if there is an identifier list instead of a parameter decl list).
4970 These two functions are separate because when a function returns
4971 or receives functions then each is called multiple times but the order
4972 of calls is different. The last call to `grokparms' is always the one
4973 that contains the formal parameter names of a function definition.
4975 Store in `last_function_parms' a chain of the decls of parms.
4976 Also store in `last_function_parm_tags' a chain of the struct, union,
4977 and enum tags declared among the parms.
4979 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4981 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4982 a mere declaration. A nonempty identifier-list gets an error message
4983 when FUNCDEF_FLAG is zero. */
4986 grokparms (parms_info, funcdef_flag)
4990 tree first_parm = TREE_CHAIN (parms_info);
4992 last_function_parms = TREE_PURPOSE (parms_info);
4993 last_function_parm_tags = TREE_VALUE (parms_info);
4995 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
4996 && !in_system_header)
4997 warning ("function declaration isn't a prototype");
5000 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
5003 pedwarn ("parameter names (without types) in function declaration");
5005 last_function_parms = first_parm;
5012 /* We no longer test FUNCDEF_FLAG.
5013 If the arg types are incomplete in a declaration,
5014 they must include undefined tags.
5015 These tags can never be defined in the scope of the declaration,
5016 so the types can never be completed,
5017 and no call can be compiled successfully. */
5019 /* In a fcn definition, arg types must be complete. */
5022 for (parm = last_function_parms, typelt = first_parm;
5024 parm = TREE_CHAIN (parm))
5025 /* Skip over any enumeration constants declared here. */
5026 if (TREE_CODE (parm) == PARM_DECL)
5028 /* Barf if the parameter itself has an incomplete type. */
5029 tree type = TREE_VALUE (typelt);
5030 if (type == error_mark_node)
5032 if (!COMPLETE_TYPE_P (type))
5034 if (funcdef_flag && DECL_NAME (parm) != 0)
5035 error ("parameter `%s' has incomplete type",
5036 IDENTIFIER_POINTER (DECL_NAME (parm)));
5038 warning ("parameter has incomplete type");
5041 TREE_VALUE (typelt) = error_mark_node;
5042 TREE_TYPE (parm) = error_mark_node;
5046 /* This has been replaced by parm_tags_warning, which
5047 uses a more accurate criterion for what to warn
5051 /* Now warn if is a pointer to an incomplete type. */
5052 while (TREE_CODE (type) == POINTER_TYPE
5053 || TREE_CODE (type) == REFERENCE_TYPE)
5054 type = TREE_TYPE (type);
5055 type = TYPE_MAIN_VARIANT (type);
5056 if (!COMPLETE_TYPE_P (type))
5058 if (DECL_NAME (parm) != 0)
5059 warning ("parameter `%s' points to incomplete type",
5060 IDENTIFIER_POINTER (DECL_NAME (parm)));
5062 warning ("parameter points to incomplete type");
5066 typelt = TREE_CHAIN (typelt);
5073 /* Return a tree_list node with info on a parameter list just parsed.
5074 The TREE_PURPOSE is a chain of decls of those parms.
5075 The TREE_VALUE is a list of structure, union and enum tags defined.
5076 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5077 This tree_list node is later fed to `grokparms'.
5079 VOID_AT_END nonzero means append `void' to the end of the type-list.
5080 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5083 get_parm_info (void_at_end)
5086 register tree decl, t;
5087 register tree types = 0;
5089 tree tags = gettags ();
5090 tree parms = getdecls ();
5092 tree order = current_binding_level->parm_order;
5094 /* Just `void' (and no ellipsis) is special. There are really no parms.
5095 But if the `void' is qualified (by `const' or `volatile') or has a
5096 storage class specifier (`register'), then the behavior is undefined;
5097 by not counting it as the special case of `void' we will cause an
5098 error later. Typedefs for `void' are OK (see DR#157). */
5099 if (void_at_end && parms != 0
5100 && TREE_CHAIN (parms) == 0
5101 && VOID_TYPE_P (TREE_TYPE (parms))
5102 && ! TREE_THIS_VOLATILE (parms)
5103 && ! TREE_READONLY (parms)
5104 && ! DECL_REGISTER (parms)
5105 && DECL_NAME (parms) == 0)
5108 storedecls (NULL_TREE);
5109 return tree_cons (NULL_TREE, NULL_TREE,
5110 tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5113 /* Extract enumerator values and other non-parms declared with the parms.
5114 Likewise any forward parm decls that didn't have real parm decls. */
5115 for (decl = parms; decl;)
5117 tree next = TREE_CHAIN (decl);
5119 if (TREE_CODE (decl) != PARM_DECL)
5121 TREE_CHAIN (decl) = new_parms;
5124 else if (TREE_ASM_WRITTEN (decl))
5126 error_with_decl (decl,
5127 "parameter `%s' has just a forward declaration");
5128 TREE_CHAIN (decl) = new_parms;
5134 /* Put the parm decls back in the order they were in in the parm list. */
5135 for (t = order; t; t = TREE_CHAIN (t))
5138 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5140 TREE_CHAIN (TREE_VALUE (t)) = 0;
5143 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5146 /* Store the parmlist in the binding level since the old one
5147 is no longer a valid list. (We have changed the chain pointers.) */
5148 storedecls (new_parms);
5150 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5151 /* There may also be declarations for enumerators if an enumeration
5152 type is declared among the parms. Ignore them here. */
5153 if (TREE_CODE (decl) == PARM_DECL)
5155 /* Since there is a prototype,
5156 args are passed in their declared types. */
5157 tree type = TREE_TYPE (decl);
5158 DECL_ARG_TYPE (decl) = type;
5159 if (PROMOTE_PROTOTYPES
5160 && (TREE_CODE (type) == INTEGER_TYPE
5161 || TREE_CODE (type) == ENUMERAL_TYPE)
5162 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5163 DECL_ARG_TYPE (decl) = integer_type_node;
5165 types = tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5166 if (VOID_TYPE_P (TREE_VALUE (types)) && ! erred
5167 && DECL_NAME (decl) == 0)
5169 error ("`void' in parameter list must be the entire list");
5175 return tree_cons (new_parms, tags,
5176 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
5178 return tree_cons (new_parms, tags, nreverse (types));
5181 /* At end of parameter list, warn about any struct, union or enum tags
5182 defined within. Do so because these types cannot ever become complete. */
5185 parmlist_tags_warning ()
5190 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5192 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5193 /* An anonymous union parm type is meaningful as a GNU extension.
5194 So don't warn for that. */
5195 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5197 if (TREE_PURPOSE (elt) != 0)
5198 warning ("`%s %s' declared inside parameter list",
5199 (code == RECORD_TYPE ? "struct"
5200 : code == UNION_TYPE ? "union"
5202 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5205 /* For translation these need to be seperate warnings */
5206 if (code == RECORD_TYPE)
5207 warning ("anonymous struct declared inside parameter list");
5208 else if (code == UNION_TYPE)
5209 warning ("anonymous union declared inside parameter list");
5211 warning ("anonymous enum declared inside parameter list");
5215 warning ("its scope is only this definition or declaration, which is probably not what you want.");
5221 /* Get the struct, enum or union (CODE says which) with tag NAME.
5222 Define the tag as a forward-reference if it is not defined. */
5225 xref_tag (code, name)
5226 enum tree_code code;
5229 /* If a cross reference is requested, look up the type
5230 already defined for this tag and return it. */
5232 register tree ref = lookup_tag (code, name, current_binding_level, 0);
5233 /* Even if this is the wrong type of tag, return what we found.
5234 There will be an error message anyway, from pending_xref_error.
5235 If we create an empty xref just for an invalid use of the type,
5236 the main result is to create lots of superfluous error messages. */
5240 /* If no such tag is yet defined, create a forward-reference node
5241 and record it as the "definition".
5242 When a real declaration of this type is found,
5243 the forward-reference will be altered into a real type. */
5245 ref = make_node (code);
5246 if (code == ENUMERAL_TYPE)
5248 /* Give the type a default layout like unsigned int
5249 to avoid crashing if it does not get defined. */
5250 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5251 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5252 TYPE_USER_ALIGN (ref) = 0;
5253 TREE_UNSIGNED (ref) = 1;
5254 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5255 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5256 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5259 pushtag (name, ref);
5264 /* Make sure that the tag NAME is defined *in the current binding level*
5265 at least as a forward reference.
5266 CODE says which kind of tag NAME ought to be. */
5269 start_struct (code, name)
5270 enum tree_code code;
5273 /* If there is already a tag defined at this binding level
5274 (as a forward reference), just return it. */
5276 register tree ref = 0;
5279 ref = lookup_tag (code, name, current_binding_level, 1);
5280 if (ref && TREE_CODE (ref) == code)
5282 C_TYPE_BEING_DEFINED (ref) = 1;
5283 TYPE_PACKED (ref) = flag_pack_struct;
5284 if (TYPE_FIELDS (ref))
5285 error ("redefinition of `%s %s'",
5286 code == UNION_TYPE ? "union" : "struct",
5287 IDENTIFIER_POINTER (name));
5292 /* Otherwise create a forward-reference just so the tag is in scope. */
5294 ref = make_node (code);
5295 pushtag (name, ref);
5296 C_TYPE_BEING_DEFINED (ref) = 1;
5297 TYPE_PACKED (ref) = flag_pack_struct;
5301 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5302 of a structure component, returning a FIELD_DECL node.
5303 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5305 This is done during the parsing of the struct declaration.
5306 The FIELD_DECL nodes are chained together and the lot of them
5307 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5310 grokfield (filename, line, declarator, declspecs, width)
5311 const char *filename ATTRIBUTE_UNUSED;
5312 int line ATTRIBUTE_UNUSED;
5313 tree declarator, declspecs, width;
5317 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5319 finish_decl (value, NULL_TREE, NULL_TREE);
5320 DECL_INITIAL (value) = width;
5322 maybe_objc_check_decl (value);
5326 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5327 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5328 ATTRIBUTES are attributes to be applied to the structure. */
5331 finish_struct (t, fieldlist, attributes)
5337 int toplevel = global_binding_level == current_binding_level;
5338 int saw_named_field;
5340 /* If this type was previously laid out as a forward reference,
5341 make sure we lay it out again. */
5345 decl_attributes (t, attributes, NULL_TREE);
5347 /* Nameless union parm types are useful as GCC extension. */
5348 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5349 /* Otherwise, warn about any struct or union def. in parmlist. */
5350 if (in_parm_level_p ())
5353 pedwarn ("%s defined inside parms",
5354 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5355 else if (! flag_traditional)
5356 warning ("%s defined inside parms",
5357 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5362 for (x = fieldlist; x; x = TREE_CHAIN (x))
5363 if (DECL_NAME (x) != 0)
5367 pedwarn ("%s has no %s",
5368 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
5369 fieldlist ? _("named members") : _("members"));
5372 /* Install struct as DECL_CONTEXT of each field decl.
5373 Also process specified field sizes,m which is found in the DECL_INITIAL.
5374 Store 0 there, except for ": 0" fields (so we can find them
5375 and delete them, below). */
5377 saw_named_field = 0;
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;
5512 /* Detect flexible array member in an invalid context. */
5513 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5514 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5515 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5516 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5518 if (TREE_CODE (t) == UNION_TYPE)
5519 error_with_decl (x, "flexible array member in union");
5520 else if (TREE_CHAIN (x) != NULL_TREE)
5521 error_with_decl (x, "flexible array member not at end of struct");
5522 else if (! saw_named_field)
5523 error_with_decl (x, "flexible array member in otherwise empty struct");
5526 saw_named_field = 1;
5529 /* Delete all duplicate fields from the fieldlist */
5530 for (x = fieldlist; x && TREE_CHAIN (x);)
5531 /* Anonymous fields aren't duplicates. */
5532 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5536 register tree y = fieldlist;
5540 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5546 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5548 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5549 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5555 /* Now we have the nearly final fieldlist. Record it,
5556 then lay out the structure or union (including the fields). */
5558 TYPE_FIELDS (t) = fieldlist;
5562 /* Delete all zero-width bit-fields from the fieldlist */
5564 tree *fieldlistp = &fieldlist;
5566 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5567 *fieldlistp = TREE_CHAIN (*fieldlistp);
5569 fieldlistp = &TREE_CHAIN (*fieldlistp);
5572 /* Now we have the truly final field list.
5573 Store it in this type and in the variants. */
5575 TYPE_FIELDS (t) = fieldlist;
5577 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5579 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5580 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5581 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5582 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5585 /* If this was supposed to be a transparent union, but we can't
5586 make it one, warn and turn off the flag. */
5587 if (TREE_CODE (t) == UNION_TYPE
5588 && TYPE_TRANSPARENT_UNION (t)
5589 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5591 TYPE_TRANSPARENT_UNION (t) = 0;
5592 warning ("union cannot be made transparent");
5595 /* If this structure or union completes the type of any previous
5596 variable declaration, lay it out and output its rtl. */
5598 if (current_binding_level->n_incomplete != 0)
5601 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5603 if (TYPE_MAIN_VARIANT (TREE_TYPE (decl)) == TYPE_MAIN_VARIANT (t)
5604 && TREE_CODE (decl) != TYPE_DECL)
5606 layout_decl (decl, 0);
5607 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5608 maybe_objc_check_decl (decl);
5609 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5612 --current_binding_level->n_incomplete;
5614 else if (!COMPLETE_TYPE_P (TREE_TYPE (decl))
5615 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5617 tree element = TREE_TYPE (decl);
5618 while (TREE_CODE (element) == ARRAY_TYPE)
5619 element = TREE_TYPE (element);
5621 layout_array_type (TREE_TYPE (decl));
5626 /* Finish debugging output for this type. */
5627 rest_of_type_compilation (t, toplevel);
5632 /* Lay out the type T, and its element type, and so on. */
5635 layout_array_type (t)
5638 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5639 layout_array_type (TREE_TYPE (t));
5643 /* Begin compiling the definition of an enumeration type.
5644 NAME is its name (or null if anonymous).
5645 Returns the type object, as yet incomplete.
5646 Also records info about it so that build_enumerator
5647 may be used to declare the individual values as they are read. */
5653 register tree enumtype = 0;
5655 /* If this is the real definition for a previous forward reference,
5656 fill in the contents in the same object that used to be the
5657 forward reference. */
5660 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5662 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5664 enumtype = make_node (ENUMERAL_TYPE);
5665 pushtag (name, enumtype);
5668 C_TYPE_BEING_DEFINED (enumtype) = 1;
5670 if (TYPE_VALUES (enumtype) != 0)
5672 /* This enum is a named one that has been declared already. */
5673 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5675 /* Completely replace its old definition.
5676 The old enumerators remain defined, however. */
5677 TYPE_VALUES (enumtype) = 0;
5680 enum_next_value = integer_zero_node;
5683 if (flag_short_enums)
5684 TYPE_PACKED (enumtype) = 1;
5689 /* After processing and defining all the values of an enumeration type,
5690 install their decls in the enumeration type and finish it off.
5691 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5692 and ATTRIBUTES are the specified attributes.
5693 Returns ENUMTYPE. */
5696 finish_enum (enumtype, values, attributes)
5701 register tree pair, tem;
5702 tree minnode = 0, maxnode = 0, enum_value_type;
5703 int precision, unsign;
5704 int toplevel = (global_binding_level == current_binding_level);
5706 if (in_parm_level_p ())
5707 warning ("enum defined inside parms");
5709 decl_attributes (enumtype, attributes, NULL_TREE);
5711 /* Calculate the maximum value of any enumerator in this type. */
5713 if (values == error_mark_node)
5714 minnode = maxnode = integer_zero_node;
5717 minnode = maxnode = TREE_VALUE (values);
5718 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5720 tree value = TREE_VALUE (pair);
5721 if (tree_int_cst_lt (maxnode, value))
5723 if (tree_int_cst_lt (value, minnode))
5728 /* Construct the final type of this enumeration. It is the same
5729 as one of the integral types - the narrowest one that fits, except
5730 that normally we only go as narrow as int - and signed iff any of
5731 the values are negative. */
5732 unsign = (tree_int_cst_sgn (minnode) >= 0);
5733 precision = MAX (min_precision (minnode, unsign),
5734 min_precision (maxnode, unsign));
5735 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5737 tree narrowest = type_for_size (precision, unsign);
5740 warning ("enumeration values exceed range of largest integer");
5741 narrowest = long_long_integer_type_node;
5744 precision = TYPE_PRECISION (narrowest);
5747 precision = TYPE_PRECISION (integer_type_node);
5749 if (precision == TYPE_PRECISION (integer_type_node))
5750 enum_value_type = type_for_size (precision, 0);
5752 enum_value_type = enumtype;
5754 TYPE_MIN_VALUE (enumtype) = minnode;
5755 TYPE_MAX_VALUE (enumtype) = maxnode;
5756 TYPE_PRECISION (enumtype) = precision;
5757 TREE_UNSIGNED (enumtype) = unsign;
5758 TYPE_SIZE (enumtype) = 0;
5759 layout_type (enumtype);
5761 if (values != error_mark_node)
5763 /* Change the type of the enumerators to be the enum type. We
5764 need to do this irrespective of the size of the enum, for
5765 proper type checking. Replace the DECL_INITIALs of the
5766 enumerators, and the value slots of the list, with copies
5767 that have the enum type; they cannot be modified in place
5768 because they may be shared (e.g. integer_zero_node) Finally,
5769 change the purpose slots to point to the names of the decls. */
5770 for (pair = values; pair; pair = TREE_CHAIN (pair))
5772 tree enu = TREE_PURPOSE (pair);
5774 TREE_TYPE (enu) = enumtype;
5775 DECL_SIZE (enu) = TYPE_SIZE (enumtype);
5776 DECL_SIZE_UNIT (enu) = TYPE_SIZE_UNIT (enumtype);
5777 DECL_ALIGN (enu) = TYPE_ALIGN (enumtype);
5778 DECL_USER_ALIGN (enu) = TYPE_USER_ALIGN (enumtype);
5779 DECL_MODE (enu) = TYPE_MODE (enumtype);
5781 /* The ISO C Standard mandates enumerators to have type int,
5782 even though the underlying type of an enum type is
5783 unspecified. Here we convert any enumerators that fit in
5784 an int to type int, to avoid promotions to unsigned types
5785 when comparing integers with enumerators that fit in the
5786 int range. When -pedantic is given, build_enumerator()
5787 would have already taken care of those that don't fit. */
5788 if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
5789 DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
5791 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5793 TREE_PURPOSE (pair) = DECL_NAME (enu);
5794 TREE_VALUE (pair) = DECL_INITIAL (enu);
5797 TYPE_VALUES (enumtype) = values;
5800 /* Fix up all variant types of this enum type. */
5801 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5803 if (tem == enumtype)
5805 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5806 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5807 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5808 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5809 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5810 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5811 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5812 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5813 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5814 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5817 /* Finish debugging output for this type. */
5818 rest_of_type_compilation (enumtype, toplevel);
5823 /* Build and install a CONST_DECL for one value of the
5824 current enumeration type (one that was begun with start_enum).
5825 Return a tree-list containing the CONST_DECL and its value.
5826 Assignment of sequential values by default is handled here. */
5829 build_enumerator (name, value)
5832 register tree decl, type;
5834 /* Validate and default VALUE. */
5836 /* Remove no-op casts from the value. */
5838 STRIP_TYPE_NOPS (value);
5842 if (TREE_CODE (value) == INTEGER_CST)
5844 value = default_conversion (value);
5845 constant_expression_warning (value);
5849 error ("enumerator value for `%s' not integer constant",
5850 IDENTIFIER_POINTER (name));
5855 /* Default based on previous value. */
5856 /* It should no longer be possible to have NON_LVALUE_EXPR
5860 value = enum_next_value;
5862 error ("overflow in enumeration values");
5865 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5867 pedwarn ("ISO C restricts enumerator values to range of `int'");
5868 value = convert (integer_type_node, value);
5871 /* Set basis for default for next value. */
5872 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5873 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5875 /* Now create a declaration for the enum value name. */
5877 type = TREE_TYPE (value);
5878 type = type_for_size (MAX (TYPE_PRECISION (type),
5879 TYPE_PRECISION (integer_type_node)),
5881 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
5882 && TREE_UNSIGNED (type)));
5884 decl = build_decl (CONST_DECL, name, type);
5885 DECL_INITIAL (decl) = convert (type, value);
5888 return tree_cons (decl, value, NULL_TREE);
5892 /* Create the FUNCTION_DECL for a function definition.
5893 DECLSPECS, DECLARATOR, PREFIX_ATTRIBUTES and ATTRIBUTES are the parts of
5894 the declaration; they describe the function's name and the type it returns,
5895 but twisted together in a fashion that parallels the syntax of C.
5897 This function creates a binding context for the function body
5898 as well as setting up the FUNCTION_DECL in current_function_decl.
5900 Returns 1 on success. If the DECLARATOR is not suitable for a function
5901 (it defines a datum instead), we return 0, which tells
5902 yyparse to report a parse error. */
5905 start_function (declspecs, declarator, prefix_attributes, attributes)
5906 tree declarator, declspecs, prefix_attributes, attributes;
5908 tree decl1, old_decl;
5910 int old_immediate_size_expand = immediate_size_expand;
5912 current_function_returns_value = 0; /* Assume, until we see it does. */
5913 current_function_returns_null = 0;
5914 warn_about_return_type = 0;
5915 current_extern_inline = 0;
5916 c_function_varargs = 0;
5918 shadowed_labels = 0;
5920 /* Don't expand any sizes in the return type of the function. */
5921 immediate_size_expand = 0;
5923 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
5925 /* If the declarator is not suitable for a function definition,
5926 cause a syntax error. */
5929 immediate_size_expand = old_immediate_size_expand;
5933 decl_attributes (decl1, prefix_attributes, attributes);
5935 announce_function (decl1);
5937 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5939 error ("return type is an incomplete type");
5940 /* Make it return void instead. */
5942 = build_function_type (void_type_node,
5943 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5946 if (warn_about_return_type)
5947 pedwarn_c99 ("return type defaults to `int'");
5949 /* Save the parm names or decls from this function's declarator
5950 where store_parm_decls will find them. */
5951 current_function_parms = last_function_parms;
5952 current_function_parm_tags = last_function_parm_tags;
5954 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5955 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5956 DECL_INITIAL (decl1) = error_mark_node;
5958 /* If this definition isn't a prototype and we had a prototype declaration
5959 before, copy the arg type info from that prototype.
5960 But not if what we had before was a builtin function. */
5961 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5962 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5963 && !DECL_BUILT_IN (old_decl)
5964 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5965 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5966 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5968 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5969 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
5970 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
5973 /* If there is no explicit declaration, look for any out-of-scope implicit
5976 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
5978 /* Optionally warn of old-fashioned def with no previous prototype. */
5979 if (warn_strict_prototypes
5980 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5982 && (TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0
5983 || (DECL_BUILT_IN (old_decl)
5984 && ! C_DECL_ANTICIPATED (old_decl)))))
5985 warning ("function declaration isn't a prototype");
5986 /* Optionally warn of any global def with no previous prototype. */
5987 else if (warn_missing_prototypes
5988 && TREE_PUBLIC (decl1)
5990 && (TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0
5991 || (DECL_BUILT_IN (old_decl)
5992 && ! C_DECL_ANTICIPATED (old_decl))))
5993 && ! MAIN_NAME_P (DECL_NAME (decl1)))
5994 warning_with_decl (decl1, "no previous prototype for `%s'");
5995 /* Optionally warn of any def with no previous prototype
5996 if the function has already been used. */
5997 else if (warn_missing_prototypes
5998 && old_decl != 0 && TREE_USED (old_decl)
5999 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6000 warning_with_decl (decl1,
6001 "`%s' was used with no prototype before its definition");
6002 /* Optionally warn of any global def with no previous declaration. */
6003 else if (warn_missing_declarations
6004 && TREE_PUBLIC (decl1)
6006 && ! MAIN_NAME_P (DECL_NAME (decl1)))
6007 warning_with_decl (decl1, "no previous declaration for `%s'");
6008 /* Optionally warn of any def with no previous declaration
6009 if the function has already been used. */
6010 else if (warn_missing_declarations
6011 && old_decl != 0 && TREE_USED (old_decl)
6012 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
6013 warning_with_decl (decl1,
6014 "`%s' was used with no declaration before its definition");
6016 /* This is a definition, not a reference.
6017 So normally clear DECL_EXTERNAL.
6018 However, `extern inline' acts like a declaration
6019 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6020 DECL_EXTERNAL (decl1) = current_extern_inline;
6022 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
6023 SET_DEFAULT_DECL_ATTRIBUTES (decl1, attributes);
6026 /* This function exists in static storage.
6027 (This does not mean `static' in the C sense!) */
6028 TREE_STATIC (decl1) = 1;
6030 /* A nested function is not global. */
6031 if (current_function_decl != 0)
6032 TREE_PUBLIC (decl1) = 0;
6034 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6035 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
6040 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6041 != integer_type_node)
6042 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
6044 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
6045 args = TREE_CHAIN (args))
6047 tree type = args ? TREE_VALUE (args) : 0;
6049 if (type == void_type_node)
6056 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6057 pedwarn_with_decl (decl1,
6058 "first argument of `%s' should be `int'");
6062 if (TREE_CODE (type) != POINTER_TYPE
6063 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6064 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6066 pedwarn_with_decl (decl1,
6067 "second argument of `%s' should be `char **'");
6071 if (TREE_CODE (type) != POINTER_TYPE
6072 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6073 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6075 pedwarn_with_decl (decl1,
6076 "third argument of `%s' should probably be `char **'");
6081 /* It is intentional that this message does not mention the third
6082 argument because it's only mentioned in an appendix of the
6084 if (argct > 0 && (argct < 2 || argct > 3))
6085 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
6087 if (! TREE_PUBLIC (decl1))
6088 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
6091 /* Record the decl so that the function name is defined.
6092 If we already have a decl for this name, and it is a FUNCTION_DECL,
6093 use the old decl. */
6095 current_function_decl = pushdecl (decl1);
6098 declare_parm_level (1);
6099 current_binding_level->subblocks_tag_transparent = 1;
6101 make_decl_rtl (current_function_decl, NULL);
6103 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6104 /* Promote the value to int before returning it. */
6105 if (c_promoting_integer_type_p (restype))
6107 /* It retains unsignedness if traditional
6108 or if not really getting wider. */
6109 if (TREE_UNSIGNED (restype)
6110 && (flag_traditional
6111 || (TYPE_PRECISION (restype)
6112 == TYPE_PRECISION (integer_type_node))))
6113 restype = unsigned_type_node;
6115 restype = integer_type_node;
6117 DECL_RESULT (current_function_decl)
6118 = build_decl (RESULT_DECL, NULL_TREE, restype);
6120 /* If this fcn was already referenced via a block-scope `extern' decl
6121 (or an implicit decl), propagate certain information about the usage. */
6122 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6123 TREE_ADDRESSABLE (current_function_decl) = 1;
6125 immediate_size_expand = old_immediate_size_expand;
6127 start_fname_decls ();
6132 /* Record that this function is going to be a varargs function.
6133 This is called before store_parm_decls, which is too early
6134 to call mark_varargs directly. */
6139 c_function_varargs = 1;
6142 /* Store the parameter declarations into the current function declaration.
6143 This is called after parsing the parameter declarations, before
6144 digesting the body of the function.
6146 For an old-style definition, modify the function's type
6147 to specify at least the number of arguments. */
6152 register tree fndecl = current_function_decl;
6155 /* This is either a chain of PARM_DECLs (if a prototype was used)
6156 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6157 tree specparms = current_function_parms;
6159 /* This is a list of types declared among parms in a prototype. */
6160 tree parmtags = current_function_parm_tags;
6162 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6163 register tree parmdecls = getdecls ();
6165 /* This is a chain of any other decls that came in among the parm
6166 declarations. If a parm is declared with enum {foo, bar} x;
6167 then CONST_DECLs for foo and bar are put here. */
6170 /* Nonzero if this definition is written with a prototype. */
6173 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6175 /* This case is when the function was defined with an ANSI prototype.
6176 The parms already have decls, so we need not do anything here
6177 except record them as in effect
6178 and complain if any redundant old-style parm decls were written. */
6189 error_with_decl (fndecl,
6190 "parm types given both in parmlist and separately");
6191 /* Get rid of the erroneous decls; don't keep them on
6192 the list of parms, since they might not be PARM_DECLs. */
6193 for (decl = current_binding_level->names;
6194 decl; decl = TREE_CHAIN (decl))
6195 if (DECL_NAME (decl))
6196 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6197 for (link = current_binding_level->shadowed;
6198 link; link = TREE_CHAIN (link))
6199 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6200 current_binding_level->names = 0;
6201 current_binding_level->shadowed = 0;
6204 specparms = nreverse (specparms);
6205 for (parm = specparms; parm; parm = next)
6207 next = TREE_CHAIN (parm);
6208 if (TREE_CODE (parm) == PARM_DECL)
6210 if (DECL_NAME (parm) == 0)
6211 error_with_decl (parm, "parameter name omitted");
6212 else if (TREE_CODE (TREE_TYPE (parm)) != ERROR_MARK
6213 && VOID_TYPE_P (TREE_TYPE (parm)))
6215 error_with_decl (parm, "parameter `%s' declared void");
6216 /* Change the type to error_mark_node so this parameter
6217 will be ignored by assign_parms. */
6218 TREE_TYPE (parm) = error_mark_node;
6224 /* If we find an enum constant or a type tag,
6225 put it aside for the moment. */
6226 TREE_CHAIN (parm) = 0;
6227 others = chainon (others, parm);
6231 /* Get the decls in their original chain order
6232 and record in the function. */
6233 DECL_ARGUMENTS (fndecl) = getdecls ();
6236 /* If this function takes a variable number of arguments,
6237 add a phony parameter to the end of the parm list,
6238 to represent the position of the first unnamed argument. */
6239 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6242 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6243 /* Let's hope the address of the unnamed parm
6244 won't depend on its type. */
6245 TREE_TYPE (dummy) = integer_type_node;
6246 DECL_ARG_TYPE (dummy) = integer_type_node;
6247 DECL_ARGUMENTS (fndecl) = chainon (DECL_ARGUMENTS (fndecl), dummy);
6251 /* Now pushdecl the enum constants. */
6252 for (parm = others; parm; parm = next)
6254 next = TREE_CHAIN (parm);
6255 if (DECL_NAME (parm) == 0)
6257 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6259 else if (TREE_CODE (parm) != PARM_DECL)
6263 storetags (chainon (parmtags, gettags ()));
6267 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6268 each with a parm name as the TREE_VALUE.
6270 PARMDECLS is a chain of declarations for parameters.
6271 Warning! It can also contain CONST_DECLs which are not parameters
6272 but are names of enumerators of any enum types
6273 declared among the parameters.
6275 First match each formal parameter name with its declaration.
6276 Associate decls with the names and store the decls
6277 into the TREE_PURPOSE slots. */
6279 /* We use DECL_WEAK as a flag to show which parameters have been
6280 seen already since it is not used on PARM_DECL or CONST_DECL. */
6281 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6282 DECL_WEAK (parm) = 0;
6284 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6286 register tree tail, found = NULL;
6288 if (TREE_VALUE (parm) == 0)
6290 error_with_decl (fndecl,
6291 "parameter name missing from parameter list");
6292 TREE_PURPOSE (parm) = 0;
6296 /* See if any of the parmdecls specifies this parm by name.
6297 Ignore any enumerator decls. */
6298 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6299 if (DECL_NAME (tail) == TREE_VALUE (parm)
6300 && TREE_CODE (tail) == PARM_DECL)
6306 /* If declaration already marked, we have a duplicate name.
6307 Complain, and don't use this decl twice. */
6308 if (found && DECL_WEAK (found))
6310 error_with_decl (found, "multiple parameters named `%s'");
6314 /* If the declaration says "void", complain and ignore it. */
6315 if (found && VOID_TYPE_P (TREE_TYPE (found)))
6317 error_with_decl (found, "parameter `%s' declared void");
6318 TREE_TYPE (found) = integer_type_node;
6319 DECL_ARG_TYPE (found) = integer_type_node;
6320 layout_decl (found, 0);
6323 /* Traditionally, a parm declared float is actually a double. */
6324 if (found && flag_traditional
6325 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6327 TREE_TYPE (found) = double_type_node;
6328 DECL_ARG_TYPE (found) = double_type_node;
6329 layout_decl (found, 0);
6332 /* If no declaration found, default to int. */
6335 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6337 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6338 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6339 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6341 pedwarn_with_decl (found, "type of `%s' defaults to `int'");
6342 else if (extra_warnings)
6343 warning_with_decl (found, "type of `%s' defaults to `int'");
6347 TREE_PURPOSE (parm) = found;
6349 /* Mark this decl as "already found". */
6350 DECL_WEAK (found) = 1;
6353 /* Put anything which is on the parmdecls chain and which is
6354 not a PARM_DECL onto the list NONPARMS. (The types of
6355 non-parm things which might appear on the list include
6356 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6357 any actual PARM_DECLs not matched with any names. */
6360 for (parm = parmdecls; parm;)
6362 tree next = TREE_CHAIN (parm);
6363 TREE_CHAIN (parm) = 0;
6365 if (TREE_CODE (parm) != PARM_DECL)
6366 nonparms = chainon (nonparms, parm);
6369 /* Complain about args with incomplete types. */
6370 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6372 error_with_decl (parm, "parameter `%s' has incomplete type");
6373 TREE_TYPE (parm) = error_mark_node;
6376 if (! DECL_WEAK (parm))
6378 error_with_decl (parm,
6379 "declaration for parameter `%s' but no such parameter");
6380 /* Pretend the parameter was not missing.
6381 This gets us to a standard state and minimizes
6382 further error messages. */
6384 = chainon (specparms,
6385 tree_cons (parm, NULL_TREE, NULL_TREE));
6392 /* Chain the declarations together in the order of the list of
6393 names. Store that chain in the function decl, replacing the
6396 DECL_ARGUMENTS (fndecl) = 0;
6399 for (last = 0; parm; parm = TREE_CHAIN (parm))
6400 if (TREE_PURPOSE (parm))
6403 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6405 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6406 last = TREE_PURPOSE (parm);
6407 TREE_CHAIN (last) = 0;
6411 /* If there was a previous prototype,
6412 set the DECL_ARG_TYPE of each argument according to
6413 the type previously specified, and report any mismatches. */
6415 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6418 for (parm = DECL_ARGUMENTS (fndecl),
6419 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6420 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6421 != void_type_node));
6422 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6424 if (parm == 0 || type == 0
6425 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6427 error ("number of arguments doesn't match prototype");
6428 error_with_file_and_line (current_function_prototype_file,
6429 current_function_prototype_line,
6430 "prototype declaration");
6433 /* Type for passing arg must be consistent
6434 with that declared for the arg. */
6435 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
6437 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6438 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6440 /* Adjust argument to match prototype. E.g. a previous
6441 `int foo(float);' prototype causes
6442 `int foo(x) float x; {...}' to be treated like
6443 `int foo(float x) {...}'. This is particularly
6444 useful for argument types like uid_t. */
6445 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6447 if (PROMOTE_PROTOTYPES
6448 && (TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
6449 || TREE_CODE (TREE_TYPE (parm)) == ENUMERAL_TYPE)
6450 && TYPE_PRECISION (TREE_TYPE (parm))
6451 < TYPE_PRECISION (integer_type_node))
6452 DECL_ARG_TYPE (parm) = integer_type_node;
6456 pedwarn ("promoted argument `%s' doesn't match prototype",
6457 IDENTIFIER_POINTER (DECL_NAME (parm)));
6458 warning_with_file_and_line
6459 (current_function_prototype_file,
6460 current_function_prototype_line,
6461 "prototype declaration");
6464 /* If -traditional, allow `int' argument to match
6465 `unsigned' prototype. */
6466 else if (! (flag_traditional
6467 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6468 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6470 error ("argument `%s' doesn't match prototype",
6471 IDENTIFIER_POINTER (DECL_NAME (parm)));
6472 error_with_file_and_line (current_function_prototype_file,
6473 current_function_prototype_line,
6474 "prototype declaration");
6478 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6481 /* Otherwise, create a prototype that would match. */
6485 tree actual = 0, last = 0, type;
6487 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6489 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6491 TREE_CHAIN (last) = type;
6496 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6498 TREE_CHAIN (last) = type;
6502 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6503 of the type of this function, but we need to avoid having this
6504 affect the types of other similarly-typed functions, so we must
6505 first force the generation of an identical (but separate) type
6506 node for the relevant function type. The new node we create
6507 will be a variant of the main variant of the original function
6510 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6512 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6515 /* Now store the final chain of decls for the arguments
6516 as the decl-chain of the current lexical scope.
6517 Put the enumerators in as well, at the front so that
6518 DECL_ARGUMENTS is not modified. */
6520 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6523 /* Make sure the binding level for the top of the function body
6524 gets a BLOCK if there are any in the function.
6525 Otherwise, the dbx output is wrong. */
6527 keep_next_if_subblocks = 1;
6529 /* ??? This might be an improvement,
6530 but needs to be thought about some more. */
6532 keep_next_level_flag = 1;
6535 /* Write a record describing this function definition to the prototypes
6536 file (if requested). */
6538 gen_aux_info_record (fndecl, 1, 0, prototype);
6540 /* Initialize the RTL code for the function. */
6542 init_function_start (fndecl, input_filename, lineno);
6544 /* Begin the statement tree for this function. */
6545 DECL_LANG_SPECIFIC (current_function_decl)
6546 =((struct lang_decl *) ggc_alloc (sizeof (struct lang_decl)));
6547 begin_stmt_tree (&DECL_SAVED_TREE (current_function_decl));
6549 /* This function is being processed in whole-function mode. */
6550 cfun->x_whole_function_mode_p = 1;
6552 /* Even though we're inside a function body, we still don't want to
6553 call expand_expr to calculate the size of a variable-sized array.
6554 We haven't necessarily assigned RTL to all variables yet, so it's
6555 not safe to try to expand expressions involving them. */
6556 immediate_size_expand = 0;
6557 cfun->x_dont_save_pending_sizes_p = 1;
6560 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6561 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6562 stands for an ellipsis in the identifier list.
6564 PARMLIST is the data returned by get_parm_info for the
6565 parmlist that follows the semicolon.
6567 We return a value of the same sort that get_parm_info returns,
6568 except that it describes the combination of identifiers and parmlist. */
6571 combine_parm_decls (specparms, parmlist, void_at_end)
6572 tree specparms, parmlist;
6575 register tree fndecl = current_function_decl;
6578 tree parmdecls = TREE_PURPOSE (parmlist);
6580 /* This is a chain of any other decls that came in among the parm
6581 declarations. They were separated already by get_parm_info,
6582 so we just need to keep them separate. */
6583 tree nonparms = TREE_VALUE (parmlist);
6587 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6588 DECL_WEAK (parm) = 0;
6590 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6592 register tree tail, found = NULL;
6594 /* See if any of the parmdecls specifies this parm by name. */
6595 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6596 if (DECL_NAME (tail) == TREE_VALUE (parm))
6602 /* If declaration already marked, we have a duplicate name.
6603 Complain, and don't use this decl twice. */
6604 if (found && DECL_WEAK (found))
6606 error_with_decl (found, "multiple parameters named `%s'");
6610 /* If the declaration says "void", complain and ignore it. */
6611 if (found && VOID_TYPE_P (TREE_TYPE (found)))
6613 error_with_decl (found, "parameter `%s' declared void");
6614 TREE_TYPE (found) = integer_type_node;
6615 DECL_ARG_TYPE (found) = integer_type_node;
6616 layout_decl (found, 0);
6619 /* Traditionally, a parm declared float is actually a double. */
6620 if (found && flag_traditional
6621 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6623 TREE_TYPE (found) = double_type_node;
6624 DECL_ARG_TYPE (found) = double_type_node;
6625 layout_decl (found, 0);
6628 /* If no declaration found, default to int. */
6631 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6633 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6634 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6635 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6636 error_with_decl (found, "type of parameter `%s' is not declared");
6640 TREE_PURPOSE (parm) = found;
6642 /* Mark this decl as "already found". */
6643 DECL_WEAK (found) = 1;
6646 /* Complain about any actual PARM_DECLs not matched with any names. */
6648 for (parm = parmdecls; parm;)
6650 tree next = TREE_CHAIN (parm);
6651 TREE_CHAIN (parm) = 0;
6653 /* Complain about args with incomplete types. */
6654 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6656 error_with_decl (parm, "parameter `%s' has incomplete type");
6657 TREE_TYPE (parm) = error_mark_node;
6660 if (! DECL_WEAK (parm))
6662 error_with_decl (parm,
6663 "declaration for parameter `%s' but no such parameter");
6664 /* Pretend the parameter was not missing.
6665 This gets us to a standard state and minimizes
6666 further error messages. */
6668 = chainon (specparms,
6669 tree_cons (parm, NULL_TREE, NULL_TREE));
6675 /* Chain the declarations together in the order of the list of names.
6676 At the same time, build up a list of their types, in reverse order. */
6682 for (last = 0; parm; parm = TREE_CHAIN (parm))
6683 if (TREE_PURPOSE (parm))
6686 parmdecls = TREE_PURPOSE (parm);
6688 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6689 last = TREE_PURPOSE (parm);
6690 TREE_CHAIN (last) = 0;
6692 types = tree_cons (NULL_TREE, TREE_TYPE (parm), types);
6697 return tree_cons (parmdecls, nonparms,
6698 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
6700 return tree_cons (parmdecls, nonparms, nreverse (types));
6703 /* Finish up a function declaration and compile that function
6704 all the way to assembler language output. The free the storage
6705 for the function definition.
6707 This is called after parsing the body of the function definition.
6709 NESTED is nonzero if the function being finished is nested in another. */
6712 finish_function (nested)
6715 register tree fndecl = current_function_decl;
6717 /* TREE_READONLY (fndecl) = 1;
6718 This caused &foo to be of type ptr-to-const-function
6719 which then got a warning when stored in a ptr-to-function variable. */
6722 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6724 /* Must mark the RESULT_DECL as being in this function. */
6726 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6728 /* Obey `register' declarations if `setjmp' is called in this fn. */
6729 if (flag_traditional && current_function_calls_setjmp)
6731 setjmp_protect (DECL_INITIAL (fndecl));
6732 setjmp_protect_args ();
6735 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6737 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6738 != integer_type_node)
6740 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6741 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6743 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
6747 #ifdef DEFAULT_MAIN_RETURN
6748 /* Make it so that `main' always returns success by default. */
6749 DEFAULT_MAIN_RETURN;
6752 c_expand_return (integer_zero_node);
6757 finish_fname_decls ();
6759 /* Tie off the statement tree for this function. */
6760 finish_stmt_tree (&DECL_SAVED_TREE (fndecl));
6761 /* Clear out memory we no longer need. */
6762 free_after_parsing (cfun);
6763 /* Since we never call rest_of_compilation, we never clear
6764 CFUN. Do so explicitly. */
6765 free_after_compilation (cfun);
6770 /* Generate RTL for the body of this function. */
6771 c_expand_body (fndecl, nested);
6772 /* Let the error reporting routines know that we're outside a
6773 function. For a nested function, this value is used in
6774 pop_c_function_context and then reset via pop_function_context. */
6775 current_function_decl = NULL;
6779 /* Generate the RTL for the body of FNDECL. If NESTED_P is non-zero,
6780 then we are already in the process of generating RTL for another
6784 c_expand_body (fndecl, nested_p)
6788 /* There's no reason to do any of the work here if we're only doing
6789 semantic analysis; this code just generates RTL. */
6790 if (flag_syntax_only)
6793 /* Squirrel away our current state. */
6795 push_function_context ();
6797 /* Initialize the RTL code for the function. */
6798 current_function_decl = fndecl;
6799 init_function_start (fndecl, input_filename, DECL_SOURCE_LINE (fndecl));
6801 /* This function is being processed in whole-function mode. */
6802 cfun->x_whole_function_mode_p = 1;
6804 /* Even though we're inside a function body, we still don't want to
6805 call expand_expr to calculate the size of a variable-sized array.
6806 We haven't necessarily assigned RTL to all variables yet, so it's
6807 not safe to try to expand expressions involving them. */
6808 immediate_size_expand = 0;
6809 cfun->x_dont_save_pending_sizes_p = 1;
6811 /* If this is a varargs function, inform function.c. */
6812 if (c_function_varargs)
6815 /* Set up parameters and prepare for return, for the function. */
6816 expand_function_start (fndecl, 0);
6818 /* If this function is `main', emit a call to `__main'
6819 to run global initializers, etc. */
6820 if (DECL_NAME (fndecl)
6821 && MAIN_NAME_P (DECL_NAME (fndecl))
6822 && DECL_CONTEXT (fndecl) == NULL_TREE)
6823 expand_main_function ();
6825 /* Generate the RTL for this function. */
6826 expand_stmt (DECL_SAVED_TREE (fndecl));
6827 /* Allow the body of the function to be garbage collected. */
6828 DECL_SAVED_TREE (fndecl) = NULL_TREE;
6830 /* We hard-wired immediate_size_expand to zero in start_function.
6831 expand_function_end will decrement this variable. So, we set the
6832 variable to one here, so that after the decrement it will remain
6834 immediate_size_expand = 1;
6836 /* Allow language dialects to perform special processing. */
6837 if (lang_expand_function_end)
6838 (*lang_expand_function_end) ();
6840 /* Generate rtl for function exit. */
6841 expand_function_end (input_filename, lineno, 0);
6843 /* If this is a nested function, protect the local variables in the stack
6844 above us from being collected while we're compiling this function. */
6846 ggc_push_context ();
6848 /* Run the optimizers and output the assembler code for this function. */
6849 rest_of_compilation (fndecl);
6851 /* Undo the GC context switch. */
6855 /* With just -W, complain only if function returns both with
6856 and without a value. */
6858 && current_function_returns_value
6859 && current_function_returns_null)
6860 warning ("this function may return with or without a value");
6862 /* If requested, warn about function definitions where the function will
6863 return a value (usually of some struct or union type) which itself will
6864 take up a lot of stack space. */
6866 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6868 tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6870 if (ret_type && TYPE_SIZE_UNIT (ret_type)
6871 && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST
6872 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type),
6875 unsigned int size_as_int
6876 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type));
6878 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0)
6879 warning_with_decl (fndecl,
6880 "size of return value of `%s' is %u bytes",
6883 warning_with_decl (fndecl,
6884 "size of return value of `%s' is larger than %d bytes",
6889 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested_p)
6891 /* Stop pointing to the local nodes about to be freed.
6892 But DECL_INITIAL must remain nonzero so we know this
6893 was an actual function definition.
6894 For a nested function, this is done in pop_c_function_context.
6895 If rest_of_compilation set this to 0, leave it 0. */
6896 if (DECL_INITIAL (fndecl) != 0)
6897 DECL_INITIAL (fndecl) = error_mark_node;
6899 DECL_ARGUMENTS (fndecl) = 0;
6902 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6904 #ifndef ASM_OUTPUT_CONSTRUCTOR
6905 if (! flag_gnu_linker)
6906 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6909 assemble_constructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl)));
6912 if (DECL_STATIC_DESTRUCTOR (fndecl))
6914 #ifndef ASM_OUTPUT_DESTRUCTOR
6915 if (! flag_gnu_linker)
6916 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6919 assemble_destructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl)));
6924 /* Return to the enclosing function. */
6925 pop_function_context ();
6926 /* If the nested function was inline, write it out if that is
6928 if (!TREE_ASM_WRITTEN (fndecl) && TREE_ADDRESSABLE (fndecl))
6930 push_function_context ();
6931 output_inline_function (fndecl);
6932 pop_function_context ();
6938 /* Check the declarations given in a for-loop for satisfying the C99
6941 check_for_loop_decls ()
6947 /* If we get here, declarations have been used in a for loop without
6948 the C99 for loop scope. This doesn't make much sense, so don't
6950 error ("`for' loop initial declaration used outside C99 mode");
6953 /* C99 subclause 6.8.5 paragraph 3:
6955 [#3] The declaration part of a for statement shall only
6956 declare identifiers for objects having storage class auto or
6959 It isn't clear whether, in this sentence, "identifiers" binds to
6960 "shall only declare" or to "objects" - that is, whether all identifiers
6961 declared must be identifiers for objects, or whether the restriction
6962 only applies to those that are. (A question on this in comp.std.c
6963 in November 2000 received no answer.) We implement the strictest
6964 interpretation, to avoid creating an extension which later causes
6967 for (t = gettags (); t; t = TREE_CHAIN (t))
6969 if (TREE_PURPOSE (t) != 0)
6970 error ("`%s %s' declared in `for' loop initial declaration",
6971 (TREE_CODE (TREE_VALUE (t)) == RECORD_TYPE ? "struct"
6972 : TREE_CODE (TREE_VALUE (t)) == UNION_TYPE ? "union"
6974 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6976 for (t = getdecls (); t; t = TREE_CHAIN (t))
6978 if (TREE_CODE (t) != VAR_DECL && DECL_NAME (t))
6979 error_with_decl (t, "declaration of non-variable `%s' in `for' loop initial declaration");
6980 else if (TREE_STATIC (t))
6981 error_with_decl (t, "declaration of static variable `%s' in `for' loop initial declaration");
6982 else if (DECL_EXTERNAL (t))
6983 error_with_decl (t, "declaration of `extern' variable `%s' in `for' loop initial declaration");
6987 /* Save and restore the variables in this file and elsewhere
6988 that keep track of the progress of compilation of the current function.
6989 Used for nested functions. */
6991 struct c_language_function
6993 struct language_function base;
6995 tree shadowed_labels;
6998 int warn_about_return_type;
7000 struct binding_level *binding_level;
7003 /* Save and reinitialize the variables
7004 used during compilation of a C function. */
7007 push_c_function_context (f)
7010 struct c_language_function *p;
7011 p = ((struct c_language_function *)
7012 xmalloc (sizeof (struct c_language_function)));
7013 f->language = (struct language_function *) p;
7015 p->base.x_stmt_tree = c_stmt_tree;
7016 p->base.x_scope_stmt_stack = c_scope_stmt_stack;
7017 p->named_labels = named_labels;
7018 p->shadowed_labels = shadowed_labels;
7019 p->returns_value = current_function_returns_value;
7020 p->returns_null = current_function_returns_null;
7021 p->warn_about_return_type = warn_about_return_type;
7022 p->extern_inline = current_extern_inline;
7023 p->binding_level = current_binding_level;
7026 /* Restore the variables used during compilation of a C function. */
7029 pop_c_function_context (f)
7032 struct c_language_function *p
7033 = (struct c_language_function *) f->language;
7036 /* Bring back all the labels that were shadowed. */
7037 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
7038 if (DECL_NAME (TREE_VALUE (link)) != 0)
7039 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
7040 = TREE_VALUE (link);
7042 if (DECL_SAVED_INSNS (current_function_decl) == 0
7043 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
7045 /* Stop pointing to the local nodes about to be freed. */
7046 /* But DECL_INITIAL must remain nonzero so we know this
7047 was an actual function definition. */
7048 DECL_INITIAL (current_function_decl) = error_mark_node;
7049 DECL_ARGUMENTS (current_function_decl) = 0;
7052 c_stmt_tree = p->base.x_stmt_tree;
7053 c_scope_stmt_stack = p->base.x_scope_stmt_stack;
7054 named_labels = p->named_labels;
7055 shadowed_labels = p->shadowed_labels;
7056 current_function_returns_value = p->returns_value;
7057 current_function_returns_null = p->returns_null;
7058 warn_about_return_type = p->warn_about_return_type;
7059 current_extern_inline = p->extern_inline;
7060 current_binding_level = p->binding_level;
7066 /* Mark the language specific parts of F for GC. */
7069 mark_c_function_context (f)
7072 struct c_language_function *p
7073 = (struct c_language_function *) f->language;
7078 mark_c_language_function (&p->base);
7079 ggc_mark_tree (p->shadowed_labels);
7080 ggc_mark_tree (p->named_labels);
7081 mark_binding_level (&p->binding_level);
7084 /* Copy the DECL_LANG_SEPECIFIC data associated with NODE. */
7087 copy_lang_decl (decl)
7090 struct lang_decl *ld;
7092 if (!DECL_LANG_SPECIFIC (decl))
7095 ld = (struct lang_decl *) ggc_alloc (sizeof (struct lang_decl));
7096 memcpy ((char *) ld, (char *) DECL_LANG_SPECIFIC (decl),
7097 sizeof (struct lang_decl));
7098 DECL_LANG_SPECIFIC (decl) = ld;
7101 /* Mark the language specific bits in T for GC. */
7107 if (TREE_CODE (t) == IDENTIFIER_NODE)
7109 struct lang_identifier *i = (struct lang_identifier *) t;
7110 ggc_mark_tree (i->global_value);
7111 ggc_mark_tree (i->local_value);
7112 ggc_mark_tree (i->label_value);
7113 ggc_mark_tree (i->implicit_decl);
7114 ggc_mark_tree (i->error_locus);
7115 ggc_mark_tree (i->limbo_value);
7117 else if (TYPE_P (t) && TYPE_LANG_SPECIFIC (t))
7118 ggc_mark (TYPE_LANG_SPECIFIC (t));
7119 else if (DECL_P (t) && DECL_LANG_SPECIFIC (t))
7121 ggc_mark (DECL_LANG_SPECIFIC (t));
7122 c_mark_lang_decl (&DECL_LANG_SPECIFIC (t)->base);
7126 /* The functions below are required for functionality of doing
7127 function at once processing in the C front end. Currently these
7128 functions are not called from anywhere in the C front end, but as
7129 these changes continue, that will change. */
7131 /* Returns non-zero if the current statement is a full expression,
7132 i.e. temporaries created during that statement should be destroyed
7133 at the end of the statement. */
7136 stmts_are_full_exprs_p ()
7141 /* Returns the stmt_tree (if any) to which statements are currently
7142 being added. If there is no active statement-tree, NULL is
7146 current_stmt_tree ()
7148 return &c_stmt_tree;
7151 /* Returns the stack of SCOPE_STMTs for the current function. */
7154 current_scope_stmt_stack ()
7156 return &c_scope_stmt_stack;
7159 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
7163 anon_aggr_type_p (node)
7164 tree node ATTRIBUTE_UNUSED;
7169 /* Dummy function in place of callback used by C++. */
7172 extract_interface_info ()
7176 /* Return a new COMPOUND_STMT, after adding it to the current
7180 c_begin_compound_stmt ()
7184 /* Create the COMPOUND_STMT. */
7185 stmt = add_stmt (build_stmt (COMPOUND_STMT, NULL_TREE));
7190 /* Expand T (a DECL_STMT) if it declares an entity not handled by the
7194 c_expand_decl_stmt (t)
7197 tree decl = DECL_STMT_DECL (t);
7199 /* Expand nested functions. */
7200 if (TREE_CODE (decl) == FUNCTION_DECL
7201 && DECL_CONTEXT (decl) == current_function_decl
7202 && DECL_SAVED_TREE (decl))
7203 c_expand_body (decl, /*nested_p=*/1);
7206 /* Return the IDENTIFIER_GLOBAL_VALUE of T, for use in common code, since
7207 the definition of IDENTIFIER_GLOBAL_VALUE is different for C and C++. */
7210 identifier_global_value (t)
7213 return IDENTIFIER_GLOBAL_VALUE (t);
7216 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
7217 otherwise the name is found in ridpointers from RID_INDEX. */
7220 record_builtin_type (rid_index, name, type)
7227 id = ridpointers[(int) rid_index];
7229 id = get_identifier (name);
7230 pushdecl (build_decl (TYPE_DECL, id, type));
7233 /* Build the void_list_node (void_type_node having been created). */
7235 build_void_list_node ()
7237 tree t = build_tree_list (NULL_TREE, void_type_node);