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. */
46 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
48 { NORMAL, /* Ordinary declaration */
49 FUNCDEF, /* Function definition */
50 PARM, /* Declaration of parm before function body */
51 FIELD, /* Declaration inside struct or union */
52 BITFIELD, /* Likewise but with specified width */
53 TYPENAME}; /* Typename (inside cast or sizeof) */
56 /* Nonzero if we have seen an invalid cross reference
57 to a struct, union, or enum, but not yet printed the message. */
59 tree pending_invalid_xref;
60 /* File and line to appear in the eventual error message. */
61 const char *pending_invalid_xref_file;
62 int pending_invalid_xref_line;
64 /* While defining an enum type, this is 1 plus the last enumerator
65 constant value. Note that will do not have to save this or `enum_overflow'
66 around nested function definition since such a definition could only
67 occur in an enum value expression and we don't use these variables in
70 static tree enum_next_value;
72 /* Nonzero means that there was overflow computing enum_next_value. */
74 static int enum_overflow;
76 /* Parsing a function declarator leaves a list of parameter names
77 or a chain or parameter decls here. */
79 static tree last_function_parms;
81 /* Parsing a function declarator leaves here a chain of structure
82 and enum types declared in the parmlist. */
84 static tree last_function_parm_tags;
86 /* After parsing the declarator that starts a function definition,
87 `start_function' puts here the list of parameter names or chain of decls.
88 `store_parm_decls' finds it here. */
90 static tree current_function_parms;
92 /* Similar, for last_function_parm_tags. */
93 static tree current_function_parm_tags;
95 /* Similar, for the file and line that the prototype came from if this is
96 an old-style definition. */
97 static const char *current_function_prototype_file;
98 static int current_function_prototype_line;
100 /* The current statement tree. */
102 static struct stmt_tree_s c_stmt_tree;
104 /* The current scope statement stack. */
106 static tree c_scope_stmt_stack;
108 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
109 that have names. Here so we can clear out their names' definitions
110 at the end of the function. */
112 static tree named_labels;
114 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
116 static tree shadowed_labels;
118 /* Nonzero when store_parm_decls is called indicates a varargs function.
119 Value not meaningful after store_parm_decls. */
121 static int c_function_varargs;
123 /* Set to 0 at beginning of a function definition, set to 1 if
124 a return statement that specifies a return value is seen. */
126 int current_function_returns_value;
128 /* Set to 0 at beginning of a function definition, set to 1 if
129 a return statement with no argument is seen. */
131 int current_function_returns_null;
133 /* Set to nonzero by `grokdeclarator' for a function
134 whose return type is defaulted, if warnings for this are desired. */
136 static int warn_about_return_type;
138 /* Nonzero when starting a function declared `extern inline'. */
140 static int current_extern_inline;
142 /* For each binding contour we allocate a binding_level structure
143 * which records the names defined in that contour.
146 * 1) one for each function definition,
147 * where internal declarations of the parameters appear.
148 * 2) one for each compound statement,
149 * to record its declarations.
151 * The current meaning of a name can be found by searching the levels from
152 * the current one out to the global one.
155 /* Note that the information in the `names' component of the global contour
156 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
160 /* A chain of _DECL nodes for all variables, constants, functions,
161 and typedef types. These are in the reverse of the order supplied.
165 /* A list of structure, union and enum definitions,
166 * for looking up tag names.
167 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
168 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
169 * or ENUMERAL_TYPE node.
173 /* For each level, a list of shadowed outer-level local definitions
174 to be restored when this level is popped.
175 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
176 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
179 /* For each level (except not the global one),
180 a chain of BLOCK nodes for all the levels
181 that were entered and exited one level down. */
184 /* The BLOCK node for this level, if one has been preallocated.
185 If 0, the BLOCK is allocated (if needed) when the level is popped. */
188 /* The binding level which this one is contained in (inherits from). */
189 struct binding_level *level_chain;
191 /* Nonzero for the level that holds the parameters of a function. */
194 /* Nonzero if this level "doesn't exist" for tags. */
195 char tag_transparent;
197 /* Nonzero if sublevels of this level "don't exist" for tags.
198 This is set in the parm level of a function definition
199 while reading the function body, so that the outermost block
200 of the function body will be tag-transparent. */
201 char subblocks_tag_transparent;
203 /* Nonzero means make a BLOCK for this level regardless of all else. */
206 /* Nonzero means make a BLOCK if this level has any subblocks. */
207 char keep_if_subblocks;
209 /* Number of decls in `names' that have incomplete
210 structure or union types. */
213 /* A list of decls giving the (reversed) specified order of parms,
214 not including any forward-decls in the parmlist.
215 This is so we can put the parms in proper order for assign_parms. */
219 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
221 /* The binding level currently in effect. */
223 static struct binding_level *current_binding_level;
225 /* A chain of binding_level structures awaiting reuse. */
227 static struct binding_level *free_binding_level;
229 /* The outermost binding level, for names of file scope.
230 This is created when the compiler is started and exists
231 through the entire run. */
233 static struct binding_level *global_binding_level;
235 /* Binding level structures are initialized by copying this one. */
237 static struct binding_level clear_binding_level
238 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, 0,
241 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
243 static int keep_next_level_flag;
245 /* Nonzero means make a BLOCK for the next level pushed
246 if it has subblocks. */
248 static int keep_next_if_subblocks;
250 /* The chain of outer levels of label scopes.
251 This uses the same data structure used for binding levels,
252 but it works differently: each link in the chain records
253 saved values of named_labels and shadowed_labels for
254 a label binding level outside the current one. */
256 static struct binding_level *label_level_chain;
258 /* Functions called automatically at the beginning and end of execution. */
260 tree static_ctors, static_dtors;
262 /* Forward declarations. */
264 static struct binding_level * make_binding_level PARAMS ((void));
265 static void mark_binding_level PARAMS ((void *));
266 static void clear_limbo_values PARAMS ((tree));
267 static int duplicate_decls PARAMS ((tree, tree, int));
268 static int redeclaration_error_message PARAMS ((tree, tree));
269 static void storedecls PARAMS ((tree));
270 static void storetags PARAMS ((tree));
271 static tree lookup_tag PARAMS ((enum tree_code, tree,
272 struct binding_level *, int));
273 static tree lookup_tag_reverse PARAMS ((tree));
274 static tree grokdeclarator PARAMS ((tree, tree, enum decl_context,
276 static tree grokparms PARAMS ((tree, int));
277 static void layout_array_type PARAMS ((tree));
278 static tree c_make_fname_decl PARAMS ((tree, int));
279 static void c_expand_body PARAMS ((tree, int));
281 /* C-specific option variables. */
283 /* Nonzero means allow type mismatches in conditional expressions;
284 just make their values `void'. */
286 int flag_cond_mismatch;
288 /* Nonzero means don't recognize the keyword `asm'. */
292 /* Nonzero means do some things the same way PCC does. */
294 int flag_traditional;
296 /* Nonzero means enable C89 Amendment 1 features. */
300 /* Nonzero means use the ISO C99 dialect of C. */
304 /* Nonzero means that we have builtin functions, and main is an int */
308 /* Nonzero means add default format_arg attributes for functions not
311 int flag_noniso_default_format_attributes = 1;
313 /* Nonzero means to allow single precision math even if we're generally
314 being traditional. */
315 int flag_allow_single_precision = 0;
317 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
319 int flag_signed_bitfields = 1;
320 int explicit_flag_signed_bitfields = 0;
322 /* Nonzero means warn about use of implicit int. */
324 int warn_implicit_int;
326 /* Nonzero means warn about usage of long long when `-pedantic'. */
328 int warn_long_long = 1;
330 /* Nonzero means message about use of implicit function declarations;
331 1 means warning; 2 means error. */
333 int mesg_implicit_function_declaration = -1;
335 /* Nonzero means give string constants the type `const char *'
336 to get extra warnings from them. These warnings will be too numerous
337 to be useful, except in thoroughly ANSIfied programs. */
339 int flag_const_strings;
341 /* Nonzero means warn about pointer casts that can drop a type qualifier
342 from the pointer target type. */
346 /* Nonzero means warn when casting a function call to a type that does
347 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
348 when there is no previous declaration of sqrt or malloc. */
350 int warn_bad_function_cast;
352 /* Warn about functions which might be candidates for format attributes. */
354 int warn_missing_format_attribute;
356 /* Warn about traditional constructs whose meanings changed in ANSI C. */
358 int warn_traditional;
360 /* Nonzero means warn about sizeof(function) or addition/subtraction
361 of function pointers. */
363 int warn_pointer_arith;
365 /* Nonzero means warn for non-prototype function decls
366 or non-prototyped defs without previous prototype. */
368 int warn_strict_prototypes;
370 /* Nonzero means warn for any global function def
371 without separate previous prototype decl. */
373 int warn_missing_prototypes;
375 /* Nonzero means warn for any global function def
376 without separate previous decl. */
378 int warn_missing_declarations;
380 /* Nonzero means warn about multiple (redundant) decls for the same single
381 variable or function. */
383 int warn_redundant_decls = 0;
385 /* Nonzero means warn about extern declarations of objects not at
386 file-scope level and about *all* declarations of functions (whether
387 extern or static) not at file-scope level. Note that we exclude
388 implicit function declarations. To get warnings about those, use
391 int warn_nested_externs = 0;
393 /* Warn about a subscript that has type char. */
395 int warn_char_subscripts = 0;
397 /* Warn if a type conversion is done that might have confusing results. */
401 /* Warn if adding () is suggested. */
403 int warn_parentheses;
405 /* Warn if initializer is not completely bracketed. */
407 int warn_missing_braces;
409 /* Warn if main is suspicious. */
413 /* Warn about #pragma directives that are not recognised. */
415 int warn_unknown_pragmas = 0; /* Tri state variable. */
417 /* Warn about comparison of signed and unsigned values.
418 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
420 int warn_sign_compare = -1;
422 /* Warn about testing equality of floating point numbers. */
424 int warn_float_equal = 0;
426 /* Nonzero means warn about use of multicharacter literals. */
428 int warn_multichar = 1;
430 /* The variant of the C language being processed. */
432 c_language_kind c_language = clk_c;
434 /* Nonzero means `$' can be in an identifier. */
436 #ifndef DOLLARS_IN_IDENTIFIERS
437 #define DOLLARS_IN_IDENTIFIERS 1
439 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
441 /* Decode the string P as a language-specific option for C.
442 Return the number of strings consumed. Should not complain
443 if it does not recognise the option. */
446 c_decode_option (argc, argv)
447 int argc ATTRIBUTE_UNUSED;
450 int strings_processed;
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 (dump_switch_p (p))
598 else if (!strcmp (p, "-ansi"))
600 else if (!strcmp (p, "-Werror-implicit-function-declaration"))
601 mesg_implicit_function_declaration = 2;
602 else if (!strcmp (p, "-Wimplicit-function-declaration"))
603 mesg_implicit_function_declaration = 1;
604 else if (!strcmp (p, "-Wno-implicit-function-declaration"))
605 mesg_implicit_function_declaration = 0;
606 else if (!strcmp (p, "-Wimplicit-int"))
607 warn_implicit_int = 1;
608 else if (!strcmp (p, "-Wno-implicit-int"))
609 warn_implicit_int = 0;
610 else if (!strcmp (p, "-Wimplicit"))
612 warn_implicit_int = 1;
613 if (mesg_implicit_function_declaration != 2)
614 mesg_implicit_function_declaration = 1;
616 else if (!strcmp (p, "-Wno-implicit"))
617 warn_implicit_int = 0, mesg_implicit_function_declaration = 0;
618 else if (!strcmp (p, "-Wlong-long"))
620 else if (!strcmp (p, "-Wno-long-long"))
622 else if (!strcmp (p, "-Wwrite-strings"))
623 flag_const_strings = 1;
624 else if (!strcmp (p, "-Wno-write-strings"))
625 flag_const_strings = 0;
626 else if (!strcmp (p, "-Wcast-qual"))
628 else if (!strcmp (p, "-Wno-cast-qual"))
630 else if (!strcmp (p, "-Wbad-function-cast"))
631 warn_bad_function_cast = 1;
632 else if (!strcmp (p, "-Wno-bad-function-cast"))
633 warn_bad_function_cast = 0;
634 else if (!strcmp (p, "-Wno-missing-noreturn"))
635 warn_missing_noreturn = 0;
636 else if (!strcmp (p, "-Wmissing-format-attribute"))
637 warn_missing_format_attribute = 1;
638 else if (!strcmp (p, "-Wno-missing-format-attribute"))
639 warn_missing_format_attribute = 0;
640 else if (!strcmp (p, "-Wpointer-arith"))
641 warn_pointer_arith = 1;
642 else if (!strcmp (p, "-Wno-pointer-arith"))
643 warn_pointer_arith = 0;
644 else if (!strcmp (p, "-Wstrict-prototypes"))
645 warn_strict_prototypes = 1;
646 else if (!strcmp (p, "-Wno-strict-prototypes"))
647 warn_strict_prototypes = 0;
648 else if (!strcmp (p, "-Wmissing-prototypes"))
649 warn_missing_prototypes = 1;
650 else if (!strcmp (p, "-Wno-missing-prototypes"))
651 warn_missing_prototypes = 0;
652 else if (!strcmp (p, "-Wmissing-declarations"))
653 warn_missing_declarations = 1;
654 else if (!strcmp (p, "-Wno-missing-declarations"))
655 warn_missing_declarations = 0;
656 else if (!strcmp (p, "-Wredundant-decls"))
657 warn_redundant_decls = 1;
658 else if (!strcmp (p, "-Wno-redundant-decls"))
659 warn_redundant_decls = 0;
660 else if (!strcmp (p, "-Wnested-externs"))
661 warn_nested_externs = 1;
662 else if (!strcmp (p, "-Wno-nested-externs"))
663 warn_nested_externs = 0;
664 else if (!strcmp (p, "-Wtraditional"))
665 warn_traditional = 1;
666 else if (!strcmp (p, "-Wno-traditional"))
667 warn_traditional = 0;
668 else if (!strncmp (p, "-Wformat=", 9))
669 set_Wformat (atoi (p + 9));
670 else if (!strcmp (p, "-Wformat"))
672 else if (!strcmp (p, "-Wno-format"))
674 else if (!strcmp (p, "-Wformat-y2k"))
676 else if (!strcmp (p, "-Wno-format-y2k"))
678 else if (!strcmp (p, "-Wformat-extra-args"))
679 warn_format_extra_args = 1;
680 else if (!strcmp (p, "-Wno-format-extra-args"))
681 warn_format_extra_args = 0;
682 else if (!strcmp (p, "-Wformat-nonliteral"))
683 warn_format_nonliteral = 1;
684 else if (!strcmp (p, "-Wno-format-nonliteral"))
685 warn_format_nonliteral = 0;
686 else if (!strcmp (p, "-Wformat-security"))
687 warn_format_security = 1;
688 else if (!strcmp (p, "-Wno-format-security"))
689 warn_format_security = 0;
690 else if (!strcmp (p, "-Wchar-subscripts"))
691 warn_char_subscripts = 1;
692 else if (!strcmp (p, "-Wno-char-subscripts"))
693 warn_char_subscripts = 0;
694 else if (!strcmp (p, "-Wconversion"))
696 else if (!strcmp (p, "-Wno-conversion"))
698 else if (!strcmp (p, "-Wparentheses"))
699 warn_parentheses = 1;
700 else if (!strcmp (p, "-Wno-parentheses"))
701 warn_parentheses = 0;
702 else if (!strcmp (p, "-Wreturn-type"))
703 warn_return_type = 1;
704 else if (!strcmp (p, "-Wno-return-type"))
705 warn_return_type = 0;
706 else if (!strcmp (p, "-Wsequence-point"))
707 warn_sequence_point = 1;
708 else if (!strcmp (p, "-Wno-sequence-point"))
709 warn_sequence_point = 0;
710 else if (!strcmp (p, "-Wcomment"))
711 ; /* cpp handles this one. */
712 else if (!strcmp (p, "-Wno-comment"))
713 ; /* cpp handles this one. */
714 else if (!strcmp (p, "-Wcomments"))
715 ; /* cpp handles this one. */
716 else if (!strcmp (p, "-Wno-comments"))
717 ; /* cpp handles this one. */
718 else if (!strcmp (p, "-Wtrigraphs"))
719 ; /* cpp handles this one. */
720 else if (!strcmp (p, "-Wno-trigraphs"))
721 ; /* cpp handles this one. */
722 else if (!strcmp (p, "-Wundef"))
723 ; /* cpp handles this one. */
724 else if (!strcmp (p, "-Wno-undef"))
725 ; /* cpp handles this one. */
726 else if (!strcmp (p, "-Wimport"))
727 ; /* cpp handles this one. */
728 else if (!strcmp (p, "-Wno-import"))
729 ; /* cpp handles this one. */
730 else if (!strcmp (p, "-Wmissing-braces"))
731 warn_missing_braces = 1;
732 else if (!strcmp (p, "-Wno-missing-braces"))
733 warn_missing_braces = 0;
734 else if (!strcmp (p, "-Wmain"))
736 else if (!strcmp (p, "-Wno-main"))
738 else if (!strcmp (p, "-Wsign-compare"))
739 warn_sign_compare = 1;
740 else if (!strcmp (p, "-Wno-sign-compare"))
741 warn_sign_compare = 0;
742 else if (!strcmp (p, "-Wfloat-equal"))
743 warn_float_equal = 1;
744 else if (!strcmp (p, "-Wno-float-equal"))
745 warn_float_equal = 0;
746 else if (!strcmp (p, "-Wmultichar"))
748 else if (!strcmp (p, "-Wno-multichar"))
750 else if (!strcmp (p, "-Wunknown-pragmas"))
751 /* Set to greater than 1, so that even unknown pragmas in system
752 headers will be warned about. */
753 warn_unknown_pragmas = 2;
754 else if (!strcmp (p, "-Wno-unknown-pragmas"))
755 warn_unknown_pragmas = 0;
756 else if (!strcmp (p, "-Wall"))
758 /* We save the value of warn_uninitialized, since if they put
759 -Wuninitialized on the command line, we need to generate a
760 warning about not using it without also specifying -O. */
761 if (warn_uninitialized != 1)
762 warn_uninitialized = 2;
763 warn_implicit_int = 1;
764 mesg_implicit_function_declaration = 1;
765 warn_return_type = 1;
769 warn_char_subscripts = 1;
770 warn_parentheses = 1;
771 warn_sequence_point = 1;
772 warn_missing_braces = 1;
773 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
774 it off only if it's not explicit. */
776 /* Only warn about unknown pragmas that are not in system headers. */
777 warn_unknown_pragmas = 1;
780 return strings_processed;
785 /* Hooks for print_node. */
788 print_lang_decl (file, node, indent)
789 FILE *file ATTRIBUTE_UNUSED;
790 tree node ATTRIBUTE_UNUSED;
791 int indent ATTRIBUTE_UNUSED;
796 print_lang_type (file, node, indent)
797 FILE *file ATTRIBUTE_UNUSED;
798 tree node ATTRIBUTE_UNUSED;
799 int indent ATTRIBUTE_UNUSED;
804 print_lang_identifier (file, node, indent)
809 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
810 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
811 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
812 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
813 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
814 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
815 if (C_IS_RESERVED_WORD (node))
817 tree rid = ridpointers[C_RID_CODE (node)];
818 indent_to (file, indent + 4);
819 fprintf (file, "rid ");
820 fprintf (file, HOST_PTR_PRINTF, (void *)rid);
821 fprintf (file, " \"%s\"", IDENTIFIER_POINTER (rid));
825 /* Hook called at end of compilation to assume 1 elt
826 for a top-level tentative array defn that wasn't complete before. */
829 finish_incomplete_decl (decl)
832 if (TREE_CODE (decl) == VAR_DECL)
834 tree type = TREE_TYPE (decl);
835 if (type != error_mark_node
836 && TREE_CODE (type) == ARRAY_TYPE
837 && ! DECL_EXTERNAL (decl)
838 && TYPE_DOMAIN (type) == 0)
840 warning_with_decl (decl, "array `%s' assumed to have one element");
842 complete_array_type (type, NULL_TREE, 1);
844 layout_decl (decl, 0);
849 /* Create a new `struct binding_level'. */
851 static struct binding_level *
852 make_binding_level ()
855 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
858 /* Nonzero if we are currently in the global binding level. */
863 return current_binding_level == global_binding_level;
869 keep_next_level_flag = 1;
872 /* Nonzero if the current level needs to have a BLOCK made. */
877 return ((current_binding_level->keep_if_subblocks
878 && current_binding_level->blocks != 0)
879 || current_binding_level->keep
880 || current_binding_level->names != 0
881 || (current_binding_level->tags != 0
882 && !current_binding_level->tag_transparent));
885 /* Identify this binding level as a level of parameters.
886 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
887 But it turns out there is no way to pass the right value for
888 DEFINITION_FLAG, so we ignore it. */
891 declare_parm_level (definition_flag)
892 int definition_flag ATTRIBUTE_UNUSED;
894 current_binding_level->parm_flag = 1;
897 /* Nonzero if currently making parm declarations. */
902 return current_binding_level->parm_flag;
905 /* Enter a new binding level.
906 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
907 not for that of tags. */
910 pushlevel (tag_transparent)
913 register struct binding_level *newlevel = NULL_BINDING_LEVEL;
915 /* If this is the top level of a function,
916 just make sure that NAMED_LABELS is 0. */
918 if (current_binding_level == global_binding_level)
923 /* Reuse or create a struct for this binding level. */
925 if (free_binding_level)
927 newlevel = free_binding_level;
928 free_binding_level = free_binding_level->level_chain;
932 newlevel = make_binding_level ();
935 /* Add this level to the front of the chain (stack) of levels that
938 *newlevel = clear_binding_level;
939 newlevel->tag_transparent
941 || (current_binding_level
942 ? current_binding_level->subblocks_tag_transparent
944 newlevel->level_chain = current_binding_level;
945 current_binding_level = newlevel;
946 newlevel->keep = keep_next_level_flag;
947 keep_next_level_flag = 0;
948 newlevel->keep_if_subblocks = keep_next_if_subblocks;
949 keep_next_if_subblocks = 0;
952 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
955 clear_limbo_values (block)
960 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
961 if (DECL_NAME (tem) != 0)
962 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
964 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
965 clear_limbo_values (tem);
968 /* Exit a binding level.
969 Pop the level off, and restore the state of the identifier-decl mappings
970 that were in effect when this level was entered.
972 If KEEP is nonzero, this level had explicit declarations, so
973 and create a "block" (a BLOCK node) for the level
974 to record its declarations and subblocks for symbol table output.
976 If FUNCTIONBODY is nonzero, this level is the body of a function,
977 so create a block as if KEEP were set and also clear out all
980 If REVERSE is nonzero, reverse the order of decls before putting
981 them into the BLOCK. */
984 poplevel (keep, reverse, functionbody)
990 /* The chain of decls was accumulated in reverse order.
991 Put it into forward order, just for cleanliness. */
993 tree tags = current_binding_level->tags;
994 tree subblocks = current_binding_level->blocks;
997 int block_previously_created;
999 keep |= current_binding_level->keep;
1001 /* This warning is turned off because it causes warnings for
1002 declarations like `extern struct foo *x'. */
1004 /* Warn about incomplete structure types in this level. */
1005 for (link = tags; link; link = TREE_CHAIN (link))
1006 if (!COMPLETE_TYPE_P (TREE_VALUE (link)))
1008 tree type = TREE_VALUE (link);
1009 tree type_name = TYPE_NAME (type);
1010 char *id = IDENTIFIER_POINTER (TREE_CODE (type_name) == IDENTIFIER_NODE
1012 : DECL_NAME (type_name));
1013 switch (TREE_CODE (type))
1016 error ("`struct %s' incomplete in scope ending here", id);
1019 error ("`union %s' incomplete in scope ending here", id);
1022 error ("`enum %s' incomplete in scope ending here", id);
1028 /* Get the decls in the order they were written.
1029 Usually current_binding_level->names is in reverse order.
1030 But parameter decls were previously put in forward order. */
1033 current_binding_level->names
1034 = decls = nreverse (current_binding_level->names);
1036 decls = current_binding_level->names;
1038 /* Output any nested inline functions within this block
1039 if they weren't already output. */
1041 for (decl = decls; decl; decl = TREE_CHAIN (decl))
1042 if (TREE_CODE (decl) == FUNCTION_DECL
1043 && ! TREE_ASM_WRITTEN (decl)
1044 && DECL_INITIAL (decl) != 0
1045 && TREE_ADDRESSABLE (decl))
1047 /* If this decl was copied from a file-scope decl
1048 on account of a block-scope extern decl,
1049 propagate TREE_ADDRESSABLE to the file-scope decl.
1051 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1052 true, since then the decl goes through save_for_inline_copying. */
1053 if (DECL_ABSTRACT_ORIGIN (decl) != 0
1054 && DECL_ABSTRACT_ORIGIN (decl) != decl)
1055 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
1058 /* We used to warn about unused variables in expand_end_bindings,
1059 i.e. while generating RTL. But in function-at-a-time mode we may
1060 choose to never expand a function at all (e.g. auto inlining), so
1061 we do this explicitly now. */
1062 warn_about_unused_variables (getdecls ());
1064 /* If there were any declarations or structure tags in that level,
1065 or if this level is a function body,
1066 create a BLOCK to record them for the life of this function. */
1069 block_previously_created = (current_binding_level->this_block != 0);
1070 if (block_previously_created)
1071 block = current_binding_level->this_block;
1072 else if (keep || functionbody
1073 || (current_binding_level->keep_if_subblocks && subblocks != 0))
1074 block = make_node (BLOCK);
1077 BLOCK_VARS (block) = decls;
1078 BLOCK_SUBBLOCKS (block) = subblocks;
1081 /* In each subblock, record that this is its superior. */
1083 for (link = subblocks; link; link = TREE_CHAIN (link))
1084 BLOCK_SUPERCONTEXT (link) = block;
1086 /* Clear out the meanings of the local variables of this level. */
1088 for (link = decls; link; link = TREE_CHAIN (link))
1090 if (DECL_NAME (link) != 0)
1092 /* If the ident. was used or addressed via a local extern decl,
1093 don't forget that fact. */
1094 if (DECL_EXTERNAL (link))
1096 if (TREE_USED (link))
1097 TREE_USED (DECL_NAME (link)) = 1;
1098 if (TREE_ADDRESSABLE (link))
1099 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1101 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1105 /* Restore all name-meanings of the outer levels
1106 that were shadowed by this level. */
1108 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1109 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1111 /* If the level being exited is the top level of a function,
1112 check over all the labels, and clear out the current
1113 (function local) meanings of their names. */
1117 clear_limbo_values (block);
1119 /* If this is the top level block of a function,
1120 the vars are the function's parameters.
1121 Don't leave them in the BLOCK because they are
1122 found in the FUNCTION_DECL instead. */
1124 BLOCK_VARS (block) = 0;
1126 /* Clear out the definitions of all label names,
1127 since their scopes end here,
1128 and add them to BLOCK_VARS. */
1130 for (link = named_labels; link; link = TREE_CHAIN (link))
1132 register tree label = TREE_VALUE (link);
1134 if (DECL_INITIAL (label) == 0)
1136 error_with_decl (label, "label `%s' used but not defined");
1137 /* Avoid crashing later. */
1138 define_label (input_filename, lineno,
1141 else if (warn_unused_label && !TREE_USED (label))
1142 warning_with_decl (label, "label `%s' defined but not used");
1143 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1145 /* Put the labels into the "variables" of the
1146 top-level block, so debugger can see them. */
1147 TREE_CHAIN (label) = BLOCK_VARS (block);
1148 BLOCK_VARS (block) = label;
1152 /* Pop the current level, and free the structure for reuse. */
1155 register struct binding_level *level = current_binding_level;
1156 current_binding_level = current_binding_level->level_chain;
1158 level->level_chain = free_binding_level;
1159 free_binding_level = level;
1162 /* Dispose of the block that we just made inside some higher level. */
1164 DECL_INITIAL (current_function_decl) = block;
1167 if (!block_previously_created)
1168 current_binding_level->blocks
1169 = chainon (current_binding_level->blocks, block);
1171 /* If we did not make a block for the level just exited,
1172 any blocks made for inner levels
1173 (since they cannot be recorded as subblocks in that level)
1174 must be carried forward so they will later become subblocks
1175 of something else. */
1177 current_binding_level->blocks
1178 = chainon (current_binding_level->blocks, subblocks);
1180 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1181 binding contour so that they point to the appropriate construct, i.e.
1182 either to the current FUNCTION_DECL node, or else to the BLOCK node
1183 we just constructed.
1185 Note that for tagged types whose scope is just the formal parameter
1186 list for some function type specification, we can't properly set
1187 their TYPE_CONTEXTs here, because we don't have a pointer to the
1188 appropriate FUNCTION_TYPE node readily available to us. For those
1189 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1190 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1191 node which will represent the "scope" for these "parameter list local"
1195 for (link = tags; link; link = TREE_CHAIN (link))
1196 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1198 for (link = tags; link; link = TREE_CHAIN (link))
1199 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1202 TREE_USED (block) = 1;
1207 /* Delete the node BLOCK from the current binding level.
1208 This is used for the block inside a stmt expr ({...})
1209 so that the block can be reinserted where appropriate. */
1212 delete_block (block)
1216 if (current_binding_level->blocks == block)
1217 current_binding_level->blocks = TREE_CHAIN (block);
1218 for (t = current_binding_level->blocks; t;)
1220 if (TREE_CHAIN (t) == block)
1221 TREE_CHAIN (t) = TREE_CHAIN (block);
1225 TREE_CHAIN (block) = NULL;
1226 /* Clear TREE_USED which is always set by poplevel.
1227 The flag is set again if insert_block is called. */
1228 TREE_USED (block) = 0;
1231 /* Insert BLOCK at the end of the list of subblocks of the
1232 current binding level. This is used when a BIND_EXPR is expanded,
1233 to handle the BLOCK node inside the BIND_EXPR. */
1236 insert_block (block)
1239 TREE_USED (block) = 1;
1240 current_binding_level->blocks
1241 = chainon (current_binding_level->blocks, block);
1244 /* Set the BLOCK node for the innermost scope
1245 (the one we are currently in). */
1249 register tree block;
1251 current_binding_level->this_block = block;
1252 current_binding_level->names = chainon (current_binding_level->names,
1253 BLOCK_VARS (block));
1254 current_binding_level->blocks = chainon (current_binding_level->blocks,
1255 BLOCK_SUBBLOCKS (block));
1261 register struct binding_level *newlevel;
1263 /* Reuse or create a struct for this binding level. */
1265 if (free_binding_level)
1267 newlevel = free_binding_level;
1268 free_binding_level = free_binding_level->level_chain;
1272 newlevel = make_binding_level ();
1275 /* Add this level to the front of the chain (stack) of label levels. */
1277 newlevel->level_chain = label_level_chain;
1278 label_level_chain = newlevel;
1280 newlevel->names = named_labels;
1281 newlevel->shadowed = shadowed_labels;
1283 shadowed_labels = 0;
1289 register struct binding_level *level = label_level_chain;
1292 /* Clear out the definitions of the declared labels in this level.
1293 Leave in the list any ordinary, non-declared labels. */
1294 for (link = named_labels, prev = 0; link;)
1296 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1298 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1300 error_with_decl (TREE_VALUE (link),
1301 "label `%s' used but not defined");
1302 /* Avoid crashing later. */
1303 define_label (input_filename, lineno,
1304 DECL_NAME (TREE_VALUE (link)));
1306 else if (warn_unused_label && !TREE_USED (TREE_VALUE (link)))
1307 warning_with_decl (TREE_VALUE (link),
1308 "label `%s' defined but not used");
1309 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1311 /* Delete this element from the list. */
1312 link = TREE_CHAIN (link);
1314 TREE_CHAIN (prev) = link;
1316 named_labels = link;
1321 link = TREE_CHAIN (link);
1325 /* Bring back all the labels that were shadowed. */
1326 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1327 if (DECL_NAME (TREE_VALUE (link)) != 0)
1328 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1329 = TREE_VALUE (link);
1331 named_labels = chainon (named_labels, level->names);
1332 shadowed_labels = level->shadowed;
1334 /* Pop the current level, and free the structure for reuse. */
1335 label_level_chain = label_level_chain->level_chain;
1336 level->level_chain = free_binding_level;
1337 free_binding_level = level;
1340 /* Push a definition or a declaration of struct, union or enum tag "name".
1341 "type" should be the type node.
1342 We assume that the tag "name" is not already defined.
1344 Note that the definition may really be just a forward reference.
1345 In that case, the TYPE_SIZE will be zero. */
1348 pushtag (name, type)
1351 register struct binding_level *b;
1353 /* Find the proper binding level for this type tag. */
1355 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1360 /* Record the identifier as the type's name if it has none. */
1362 if (TYPE_NAME (type) == 0)
1363 TYPE_NAME (type) = name;
1366 b->tags = tree_cons (name, type, b->tags);
1368 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1369 tagged type we just added to the current binding level. This fake
1370 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1371 to output a representation of a tagged type, and it also gives
1372 us a convenient place to record the "scope start" address for the
1375 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1377 /* An approximation for now, so we can tell this is a function-scope tag.
1378 This will be updated in poplevel. */
1379 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1382 /* Handle when a new declaration NEWDECL
1383 has the same name as an old one OLDDECL
1384 in the same binding contour.
1385 Prints an error message if appropriate.
1387 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1388 Otherwise, return 0.
1390 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1391 and OLDDECL is in an outer binding level and should thus not be changed. */
1394 duplicate_decls (newdecl, olddecl, different_binding_level)
1395 register tree newdecl, olddecl;
1396 int different_binding_level;
1398 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1399 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1400 && DECL_INITIAL (newdecl) != 0);
1401 tree oldtype = TREE_TYPE (olddecl);
1402 tree newtype = TREE_TYPE (newdecl);
1405 if (DECL_P (olddecl))
1406 DECL_MACHINE_ATTRIBUTES (newdecl)
1407 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1409 if (TREE_CODE (newtype) == ERROR_MARK
1410 || TREE_CODE (oldtype) == ERROR_MARK)
1413 /* New decl is completely inconsistent with the old one =>
1414 tell caller to replace the old one.
1415 This is always an error except in the case of shadowing a builtin. */
1416 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1418 if (TREE_CODE (olddecl) == FUNCTION_DECL
1419 && (DECL_BUILT_IN (olddecl)
1420 || DECL_BUILT_IN_NONANSI (olddecl)))
1422 /* If you declare a built-in or predefined function name as static,
1423 the old definition is overridden,
1424 but optionally warn this was a bad choice of name. */
1425 if (!TREE_PUBLIC (newdecl))
1429 else if (DECL_BUILT_IN (olddecl))
1430 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1432 warning_with_decl (newdecl, "shadowing library function `%s'");
1434 /* Likewise, if the built-in is not ansi, then programs can
1435 override it even globally without an error. */
1436 else if (! DECL_BUILT_IN (olddecl))
1437 warning_with_decl (newdecl,
1438 "library function `%s' declared as non-function");
1440 else if (DECL_BUILT_IN_NONANSI (olddecl))
1441 warning_with_decl (newdecl,
1442 "built-in function `%s' declared as non-function");
1444 warning_with_decl (newdecl,
1445 "built-in function `%s' declared as non-function");
1449 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1450 error_with_decl (olddecl, "previous declaration of `%s'");
1456 /* For real parm decl following a forward decl,
1457 return 1 so old decl will be reused. */
1458 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1459 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1462 /* The new declaration is the same kind of object as the old one.
1463 The declarations may partially match. Print warnings if they don't
1464 match enough. Ultimately, copy most of the information from the new
1465 decl to the old one, and keep using the old one. */
1467 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1468 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1469 && DECL_INITIAL (olddecl) == 0)
1470 /* If -traditional, avoid error for redeclaring fcn
1471 after implicit decl. */
1473 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1474 && DECL_BUILT_IN (olddecl))
1476 /* A function declaration for a built-in function. */
1477 if (!TREE_PUBLIC (newdecl))
1479 /* If you declare a built-in function name as static, the
1480 built-in definition is overridden,
1481 but optionally warn this was a bad choice of name. */
1483 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1484 /* Discard the old built-in function. */
1487 else if (!types_match)
1489 /* Accept the return type of the new declaration if same modes. */
1490 tree oldreturntype = TREE_TYPE (oldtype);
1491 tree newreturntype = TREE_TYPE (newtype);
1493 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1495 /* Function types may be shared, so we can't just modify
1496 the return type of olddecl's function type. */
1498 = build_function_type (newreturntype,
1499 TYPE_ARG_TYPES (oldtype));
1501 types_match = comptypes (newtype, trytype);
1505 /* Accept harmless mismatch in first argument type also.
1506 This is for the ffs and fprintf builtins. */
1507 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1508 && TYPE_ARG_TYPES (oldtype) != 0
1509 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1510 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1511 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1512 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1514 /* Function types may be shared, so we can't just modify
1515 the return type of olddecl's function type. */
1517 = build_function_type (TREE_TYPE (oldtype),
1518 tree_cons (NULL_TREE,
1519 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1520 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1522 types_match = comptypes (newtype, trytype);
1526 if (! different_binding_level)
1527 TREE_TYPE (olddecl) = oldtype;
1531 /* If types don't match for a built-in, throw away the built-in. */
1532 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1536 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1537 && DECL_SOURCE_LINE (olddecl) == 0)
1539 /* A function declaration for a predeclared function
1540 that isn't actually built in. */
1541 if (!TREE_PUBLIC (newdecl))
1543 /* If you declare it as static, the
1544 default definition is overridden. */
1547 else if (!types_match)
1549 /* If the types don't match, preserve volatility indication.
1550 Later on, we will discard everything else about the
1551 default declaration. */
1552 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1555 /* Permit char *foo () to match void *foo (...) if not pedantic,
1556 if one of them came from a system header file. */
1557 else if (!types_match
1558 && TREE_CODE (olddecl) == FUNCTION_DECL
1559 && TREE_CODE (newdecl) == FUNCTION_DECL
1560 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1561 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1562 && (DECL_IN_SYSTEM_HEADER (olddecl)
1563 || DECL_IN_SYSTEM_HEADER (newdecl))
1564 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1565 && TYPE_ARG_TYPES (oldtype) == 0
1566 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1567 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1569 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1570 && TYPE_ARG_TYPES (newtype) == 0
1571 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1572 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1575 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1576 /* Make sure we keep void * as ret type, not char *. */
1577 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1578 TREE_TYPE (newdecl) = newtype = oldtype;
1580 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1581 we will come back here again. */
1582 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1584 else if (!types_match
1585 /* Permit char *foo (int, ...); followed by char *foo ();
1587 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1589 /* Return types must still match. */
1590 && comptypes (TREE_TYPE (oldtype),
1591 TREE_TYPE (newtype))
1592 && TYPE_ARG_TYPES (newtype) == 0))
1594 error_with_decl (newdecl, "conflicting types for `%s'");
1595 /* Check for function type mismatch
1596 involving an empty arglist vs a nonempty one. */
1597 if (TREE_CODE (olddecl) == FUNCTION_DECL
1598 && comptypes (TREE_TYPE (oldtype),
1599 TREE_TYPE (newtype))
1600 && ((TYPE_ARG_TYPES (oldtype) == 0
1601 && DECL_INITIAL (olddecl) == 0)
1603 (TYPE_ARG_TYPES (newtype) == 0
1604 && DECL_INITIAL (newdecl) == 0)))
1606 /* Classify the problem further. */
1607 register tree t = TYPE_ARG_TYPES (oldtype);
1609 t = TYPE_ARG_TYPES (newtype);
1610 for (; t; t = TREE_CHAIN (t))
1612 register tree type = TREE_VALUE (t);
1614 if (TREE_CHAIN (t) == 0
1615 && TYPE_MAIN_VARIANT (type) != void_type_node)
1617 error ("A parameter list with an ellipsis can't match an empty parameter name list declaration.");
1621 if (simple_type_promotes_to (type) != NULL_TREE)
1623 error ("An argument type that has a default promotion can't match an empty parameter name list declaration.");
1628 error_with_decl (olddecl, "previous declaration of `%s'");
1632 errmsg = redeclaration_error_message (newdecl, olddecl);
1638 error_with_decl (newdecl, "redefinition of `%s'");
1641 error_with_decl (newdecl, "redeclaration of `%s'");
1644 error_with_decl (newdecl, "conflicting declarations of `%s'");
1650 error_with_decl (olddecl,
1651 ((DECL_INITIAL (olddecl)
1652 && current_binding_level == global_binding_level)
1653 ? "`%s' previously defined here"
1654 : "`%s' previously declared here"));
1656 else if (TREE_CODE (newdecl) == TYPE_DECL
1657 && (DECL_IN_SYSTEM_HEADER (olddecl)
1658 || DECL_IN_SYSTEM_HEADER (newdecl)))
1660 warning_with_decl (newdecl, "redefinition of `%s'");
1663 ((DECL_INITIAL (olddecl)
1664 && current_binding_level == global_binding_level)
1665 ? "`%s' previously defined here"
1666 : "`%s' previously declared here"));
1668 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1669 && DECL_INITIAL (olddecl) != 0
1670 && TYPE_ARG_TYPES (oldtype) == 0
1671 && TYPE_ARG_TYPES (newtype) != 0
1672 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1674 register tree type, parm;
1676 /* Prototype decl follows defn w/o prototype. */
1678 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1679 type = TYPE_ARG_TYPES (newtype),
1682 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1684 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1685 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1687 warning_with_decl (newdecl, "prototype for `%s' follows");
1688 warning_with_decl (olddecl, "non-prototype definition here");
1691 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1692 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1694 error_with_decl (newdecl,
1695 "prototype for `%s' follows and number of arguments doesn't match");
1696 error_with_decl (olddecl, "non-prototype definition here");
1700 /* Type for passing arg must be consistent
1701 with that declared for the arg. */
1702 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1703 /* If -traditional, allow `unsigned int' instead of `int'
1704 in the prototype. */
1705 && (! (flag_traditional
1706 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1707 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1709 error_with_decl (newdecl,
1710 "prototype for `%s' follows and argument %d doesn't match",
1712 error_with_decl (olddecl, "non-prototype definition here");
1718 /* Warn about mismatches in various flags. */
1721 /* Warn if function is now inline
1722 but was previously declared not inline and has been called. */
1723 if (TREE_CODE (olddecl) == FUNCTION_DECL
1724 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1725 && TREE_USED (olddecl))
1726 warning_with_decl (newdecl,
1727 "`%s' declared inline after being called");
1728 if (TREE_CODE (olddecl) == FUNCTION_DECL
1729 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1730 && DECL_INITIAL (olddecl) != 0)
1731 warning_with_decl (newdecl,
1732 "`%s' declared inline after its definition");
1734 /* If pedantic, warn when static declaration follows a non-static
1735 declaration. Otherwise, do so only for functions. */
1736 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1737 && TREE_PUBLIC (olddecl)
1738 && !TREE_PUBLIC (newdecl))
1739 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1741 /* If warn_traditional, warn when a non-static function
1742 declaration follows a static one. */
1743 if (warn_traditional && !in_system_header
1744 && TREE_CODE (olddecl) == FUNCTION_DECL
1745 && !TREE_PUBLIC (olddecl)
1746 && TREE_PUBLIC (newdecl))
1747 warning_with_decl (newdecl, "non-static declaration for `%s' follows static");
1749 /* Warn when const declaration follows a non-const
1750 declaration, but not for functions. */
1751 if (TREE_CODE (olddecl) != FUNCTION_DECL
1752 && !TREE_READONLY (olddecl)
1753 && TREE_READONLY (newdecl))
1754 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1755 /* These bits are logically part of the type, for variables.
1756 But not for functions
1757 (where qualifiers are not valid ANSI anyway). */
1758 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1759 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1760 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1761 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1765 /* Optionally warn about more than one declaration for the same name. */
1766 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1767 /* Don't warn about a function declaration
1768 followed by a definition. */
1769 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1770 && DECL_INITIAL (olddecl) == 0)
1771 /* Don't warn about extern decl followed by (tentative) definition. */
1772 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1774 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1775 warning_with_decl (olddecl, "previous declaration of `%s'");
1778 /* Copy all the DECL_... slots specified in the new decl
1779 except for any that we copy here from the old type.
1781 Past this point, we don't change OLDTYPE and NEWTYPE
1782 even if we change the types of NEWDECL and OLDDECL. */
1786 /* When copying info to olddecl, we store into write_olddecl
1787 instead. This allows us to avoid modifying olddecl when
1788 different_binding_level is true. */
1789 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1791 /* Merge the data types specified in the two decls. */
1792 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1794 if (different_binding_level)
1796 if (TYPE_ARG_TYPES (oldtype) != 0
1797 && TYPE_ARG_TYPES (newtype) == 0)
1798 TREE_TYPE (newdecl) = common_type (newtype, oldtype);
1801 = build_type_attribute_variant
1803 merge_attributes (TYPE_ATTRIBUTES (newtype),
1804 TYPE_ATTRIBUTES (oldtype)));
1808 = TREE_TYPE (olddecl)
1809 = common_type (newtype, oldtype);
1812 /* Lay the type out, unless already done. */
1813 if (oldtype != TREE_TYPE (newdecl))
1815 if (TREE_TYPE (newdecl) != error_mark_node)
1816 layout_type (TREE_TYPE (newdecl));
1817 if (TREE_CODE (newdecl) != FUNCTION_DECL
1818 && TREE_CODE (newdecl) != TYPE_DECL
1819 && TREE_CODE (newdecl) != CONST_DECL)
1820 layout_decl (newdecl, 0);
1824 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1825 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1826 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1827 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1828 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1829 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1831 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1832 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1836 /* Keep the old rtl since we can safely use it. */
1837 COPY_DECL_RTL (olddecl, newdecl);
1839 /* Merge the type qualifiers. */
1840 if (TREE_CODE (olddecl) == FUNCTION_DECL
1841 && DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1842 && ! TREE_THIS_VOLATILE (newdecl))
1843 TREE_THIS_VOLATILE (write_olddecl) = 0;
1845 if (TREE_READONLY (newdecl))
1846 TREE_READONLY (write_olddecl) = 1;
1848 if (TREE_THIS_VOLATILE (newdecl))
1850 TREE_THIS_VOLATILE (write_olddecl) = 1;
1851 if (TREE_CODE (newdecl) == VAR_DECL
1852 /* If an automatic variable is re-declared in the same
1853 function scope, but the old declaration was not
1854 volatile, make_var_volatile() would crash because the
1855 variable would have been assigned to a pseudo, not a
1856 MEM. Since this duplicate declaration is invalid
1857 anyway, we just skip the call. */
1859 make_var_volatile (newdecl);
1862 /* Keep source location of definition rather than declaration. */
1863 /* When called with different_binding_level set, keep the old
1864 information so that meaningful diagnostics can be given. */
1865 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1866 && ! different_binding_level)
1868 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1869 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1872 /* Merge the unused-warning information. */
1873 if (DECL_IN_SYSTEM_HEADER (olddecl))
1874 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1875 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1876 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1878 /* Merge the initialization information. */
1879 /* When called with different_binding_level set, don't copy over
1880 DECL_INITIAL, so that we don't accidentally change function
1881 declarations into function definitions. */
1882 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1883 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1885 /* Merge the section attribute.
1886 We want to issue an error if the sections conflict but that must be
1887 done later in decl_attributes since we are called before attributes
1889 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1890 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1892 /* Copy the assembler name.
1893 Currently, it can only be defined in the prototype. */
1894 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1896 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1898 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1899 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1901 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1902 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1903 DECL_NO_CHECK_MEMORY_USAGE (newdecl)
1904 |= DECL_NO_CHECK_MEMORY_USAGE (olddecl);
1905 DECL_NO_LIMIT_STACK (newdecl)
1906 |= DECL_NO_LIMIT_STACK (olddecl);
1909 /* If cannot merge, then use the new type and qualifiers,
1910 and don't preserve the old rtl. */
1911 else if (! different_binding_level)
1913 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1914 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1915 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1916 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1919 /* Merge the storage class information. */
1920 DECL_WEAK (newdecl) |= DECL_WEAK (olddecl);
1921 /* For functions, static overrides non-static. */
1922 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1924 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1925 /* This is since we don't automatically
1926 copy the attributes of NEWDECL into OLDDECL. */
1927 /* No need to worry about different_binding_level here because
1928 then TREE_PUBLIC (newdecl) was true. */
1929 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1930 /* If this clears `static', clear it in the identifier too. */
1931 if (! TREE_PUBLIC (olddecl))
1932 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1934 if (DECL_EXTERNAL (newdecl))
1936 if (! different_binding_level)
1938 /* Don't mess with these flags on local externs; they remain
1939 external even if there's a declaration at file scope which
1941 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1942 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1944 /* An extern decl does not override previous storage class. */
1945 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1946 if (! DECL_EXTERNAL (newdecl))
1947 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1951 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1952 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1955 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1957 /* If we're redefining a function previously defined as extern
1958 inline, make sure we emit debug info for the inline before we
1959 throw it away, in case it was inlined into a function that hasn't
1960 been written out yet. */
1961 if (new_is_definition && DECL_INITIAL (olddecl) && TREE_USED (olddecl))
1963 note_outlining_of_inline_function (olddecl);
1965 /* The new defn must not be inline. */
1966 DECL_INLINE (newdecl) = 0;
1967 DECL_UNINLINABLE (newdecl) = 1;
1971 /* If either decl says `inline', this fn is inline,
1972 unless its definition was passed already. */
1973 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
1974 DECL_INLINE (olddecl) = 1;
1976 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1979 if (DECL_BUILT_IN (olddecl))
1981 /* Get rid of any built-in function if new arg types don't match it
1982 or if we have a function definition. */
1983 if (! types_match || new_is_definition)
1985 if (! different_binding_level)
1987 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1988 DECL_BUILT_IN_CLASS (olddecl) = NOT_BUILT_IN;
1993 /* If redeclaring a builtin function, and not a definition,
1994 it stays built in. */
1995 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1996 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1999 /* Also preserve various other info from the definition. */
2000 else if (! new_is_definition)
2001 DECL_NUM_STMTS (newdecl) = DECL_NUM_STMTS (olddecl);
2002 if (! new_is_definition)
2004 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2005 /* When called with different_binding_level set, don't copy over
2006 DECL_INITIAL, so that we don't accidentally change function
2007 declarations into function definitions. */
2008 if (! different_binding_level)
2009 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2010 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
2011 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2012 if (DECL_INLINE (newdecl))
2013 DECL_ABSTRACT_ORIGIN (newdecl) = DECL_ABSTRACT_ORIGIN (olddecl);
2016 if (different_binding_level)
2019 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2020 But preserve OLDDECL's DECL_UID. */
2022 register unsigned olddecl_uid = DECL_UID (olddecl);
2024 memcpy ((char *) olddecl + sizeof (struct tree_common),
2025 (char *) newdecl + sizeof (struct tree_common),
2026 sizeof (struct tree_decl) - sizeof (struct tree_common));
2027 DECL_UID (olddecl) = olddecl_uid;
2030 /* NEWDECL contains the merged attribute lists.
2031 Update OLDDECL to be the same. */
2032 DECL_MACHINE_ATTRIBUTES (olddecl) = DECL_MACHINE_ATTRIBUTES (newdecl);
2037 /* Record a decl-node X as belonging to the current lexical scope.
2038 Check for errors (such as an incompatible declaration for the same
2039 name already seen in the same scope).
2041 Returns either X or an old decl for the same name.
2042 If an old decl is returned, it may have been smashed
2043 to agree with what X says. */
2050 register tree name = DECL_NAME (x);
2051 register struct binding_level *b = current_binding_level;
2053 DECL_CONTEXT (x) = current_function_decl;
2054 /* A local extern declaration for a function doesn't constitute nesting.
2055 A local auto declaration does, since it's a forward decl
2056 for a nested function coming later. */
2057 if ((TREE_CODE (x) == FUNCTION_DECL || TREE_CODE (x) == VAR_DECL)
2058 && DECL_INITIAL (x) == 0 && DECL_EXTERNAL (x))
2059 DECL_CONTEXT (x) = 0;
2061 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
2062 && x != IDENTIFIER_IMPLICIT_DECL (name)
2063 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
2064 && !DECL_IN_SYSTEM_HEADER (x))
2065 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
2071 int different_binding_level = 0;
2073 t = lookup_name_current_level (name);
2074 /* Don't type check externs here when -traditional. This is so that
2075 code with conflicting declarations inside blocks will get warnings
2076 not errors. X11 for instance depends on this. */
2077 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
2079 t = IDENTIFIER_GLOBAL_VALUE (name);
2080 /* Type decls at global scope don't conflict with externs declared
2081 inside lexical blocks. */
2082 if (t && TREE_CODE (t) == TYPE_DECL)
2084 different_binding_level = 1;
2086 if (t != 0 && t == error_mark_node)
2087 /* error_mark_node is 0 for a while during initialization! */
2090 error_with_decl (x, "`%s' used prior to declaration");
2095 file = DECL_SOURCE_FILE (t);
2096 line = DECL_SOURCE_LINE (t);
2099 /* If this decl is `static' and an implicit decl was seen previously,
2100 warn. But don't complain if -traditional,
2101 since traditional compilers don't complain. */
2102 if (! flag_traditional && TREE_PUBLIC (name)
2103 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2104 sets this for all functions. */
2105 && ! TREE_PUBLIC (x)
2106 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2107 /* We used to warn also for explicit extern followed by static,
2108 but sometimes you need to do it that way. */
2109 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2111 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2112 IDENTIFIER_POINTER (name));
2113 pedwarn_with_file_and_line
2114 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2115 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2116 "previous declaration of `%s'",
2117 IDENTIFIER_POINTER (name));
2118 TREE_THIS_VOLATILE (name) = 1;
2121 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2123 if (TREE_CODE (t) == PARM_DECL)
2125 /* Don't allow more than one "real" duplicate
2126 of a forward parm decl. */
2127 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2133 /* If we are processing a typedef statement, generate a whole new
2134 ..._TYPE node (which will be just an variant of the existing
2135 ..._TYPE node with identical properties) and then install the
2136 TYPE_DECL node generated to represent the typedef name as the
2137 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2139 The whole point here is to end up with a situation where each
2140 and every ..._TYPE node the compiler creates will be uniquely
2141 associated with AT MOST one node representing a typedef name.
2142 This way, even though the compiler substitutes corresponding
2143 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2144 early on, later parts of the compiler can always do the reverse
2145 translation and get back the corresponding typedef name. For
2148 typedef struct S MY_TYPE;
2151 Later parts of the compiler might only know that `object' was of
2152 type `struct S' if it were not for code just below. With this
2153 code however, later parts of the compiler see something like:
2155 struct S' == struct S
2156 typedef struct S' MY_TYPE;
2159 And they can then deduce (from the node for type struct S') that
2160 the original object declaration was:
2164 Being able to do this is important for proper support of protoize,
2165 and also for generating precise symbolic debugging information
2166 which takes full account of the programmer's (typedef) vocabulary.
2168 Obviously, we don't want to generate a duplicate ..._TYPE node if
2169 the TYPE_DECL node that we are now processing really represents a
2170 standard built-in type.
2172 Since all standard types are effectively declared at line zero
2173 in the source file, we can easily check to see if we are working
2174 on a standard type by checking the current value of lineno. */
2176 if (TREE_CODE (x) == TYPE_DECL)
2178 if (DECL_SOURCE_LINE (x) == 0)
2180 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2181 TYPE_NAME (TREE_TYPE (x)) = x;
2183 else if (TREE_TYPE (x) != error_mark_node
2184 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2186 tree tt = TREE_TYPE (x);
2187 DECL_ORIGINAL_TYPE (x) = tt;
2188 tt = build_type_copy (tt);
2190 TREE_USED (tt) = TREE_USED (x);
2195 /* Multiple external decls of the same identifier ought to match.
2196 Check against both global declarations (when traditional) and out of
2197 scope (limbo) block level declarations.
2199 We get warnings about inline functions where they are defined.
2200 Avoid duplicate warnings where they are used. */
2202 && ! (TREE_CODE (x) == FUNCTION_DECL && DECL_INLINE (x)))
2206 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2207 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2208 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2209 decl = IDENTIFIER_GLOBAL_VALUE (name);
2210 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2211 /* Decls in limbo are always extern, so no need to check that. */
2212 decl = IDENTIFIER_LIMBO_VALUE (name);
2216 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2217 /* If old decl is built-in, we already warned if we should. */
2218 && !DECL_BUILT_IN (decl))
2220 pedwarn_with_decl (x,
2221 "type mismatch with previous external decl");
2222 pedwarn_with_decl (decl, "previous external decl of `%s'");
2226 /* If a function has had an implicit declaration, and then is defined,
2227 make sure they are compatible. */
2229 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2230 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2231 && TREE_CODE (x) == FUNCTION_DECL
2232 && ! comptypes (TREE_TYPE (x),
2233 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2235 warning_with_decl (x, "type mismatch with previous implicit declaration");
2236 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2237 "previous implicit declaration of `%s'");
2240 /* In PCC-compatibility mode, extern decls of vars with no current decl
2241 take effect at top level no matter where they are. */
2242 if (flag_traditional && DECL_EXTERNAL (x)
2243 && lookup_name (name) == 0)
2245 tree type = TREE_TYPE (x);
2247 /* But don't do this if the type contains temporary nodes. */
2250 if (type == error_mark_node)
2252 if (TYPE_CONTEXT (type))
2254 warning_with_decl (x, "type of external `%s' is not global");
2255 /* By exiting the loop early, we leave TYPE nonzero,
2256 and thus prevent globalization of the decl. */
2259 else if (TREE_CODE (type) == FUNCTION_TYPE
2260 && TYPE_ARG_TYPES (type) != 0)
2261 /* The types might not be truly local,
2262 but the list of arg types certainly is temporary.
2263 Since prototypes are nontraditional,
2264 ok not to do the traditional thing. */
2266 type = TREE_TYPE (type);
2270 b = global_binding_level;
2273 /* This name is new in its binding level.
2274 Install the new declaration and return it. */
2275 if (b == global_binding_level)
2277 /* Install a global value. */
2279 /* If the first global decl has external linkage,
2280 warn if we later see static one. */
2281 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2282 TREE_PUBLIC (name) = 1;
2284 IDENTIFIER_GLOBAL_VALUE (name) = x;
2286 /* We no longer care about any previous block level declarations. */
2287 IDENTIFIER_LIMBO_VALUE (name) = 0;
2289 /* Don't forget if the function was used via an implicit decl. */
2290 if (IDENTIFIER_IMPLICIT_DECL (name)
2291 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2292 TREE_USED (x) = 1, TREE_USED (name) = 1;
2294 /* Don't forget if its address was taken in that way. */
2295 if (IDENTIFIER_IMPLICIT_DECL (name)
2296 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2297 TREE_ADDRESSABLE (x) = 1;
2299 /* Warn about mismatches against previous implicit decl. */
2300 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2301 /* If this real decl matches the implicit, don't complain. */
2302 && ! (TREE_CODE (x) == FUNCTION_DECL
2303 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2304 == integer_type_node)))
2305 pedwarn ("`%s' was previously implicitly declared to return `int'",
2306 IDENTIFIER_POINTER (name));
2308 /* If this decl is `static' and an `extern' was seen previously,
2309 that is erroneous. */
2310 if (TREE_PUBLIC (name)
2311 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2313 /* Okay to redeclare an ANSI built-in as static. */
2314 if (t != 0 && DECL_BUILT_IN (t))
2316 /* Okay to declare a non-ANSI built-in as anything. */
2317 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2319 /* Okay to have global type decl after an earlier extern
2320 declaration inside a lexical block. */
2321 else if (TREE_CODE (x) == TYPE_DECL)
2323 else if (IDENTIFIER_IMPLICIT_DECL (name))
2325 if (! TREE_THIS_VOLATILE (name))
2326 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2327 IDENTIFIER_POINTER (name));
2330 pedwarn ("`%s' was declared `extern' and later `static'",
2331 IDENTIFIER_POINTER (name));
2336 /* Here to install a non-global value. */
2337 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2338 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2340 IDENTIFIER_LOCAL_VALUE (name) = x;
2342 /* If this is an extern function declaration, see if we
2343 have a global definition or declaration for the function. */
2346 && TREE_CODE (x) == FUNCTION_DECL
2347 && TREE_CODE (oldglobal) == FUNCTION_DECL
2348 && DECL_EXTERNAL (x) && ! DECL_INLINE (x))
2350 /* We have one. Their types must agree. */
2351 if (! comptypes (TREE_TYPE (x),
2352 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2353 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2356 /* Inner extern decl is inline if global one is.
2357 Copy enough to really inline it. */
2358 if (DECL_INLINE (oldglobal))
2360 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2361 DECL_INITIAL (x) = (current_function_decl == oldglobal
2362 ? 0 : DECL_INITIAL (oldglobal));
2363 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2364 DECL_NUM_STMTS (x) = DECL_NUM_STMTS (oldglobal);
2365 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2366 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2367 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2368 DECL_ABSTRACT_ORIGIN (x)
2369 = DECL_ABSTRACT_ORIGIN (oldglobal);
2371 /* Inner extern decl is built-in if global one is. */
2372 if (DECL_BUILT_IN (oldglobal))
2374 DECL_BUILT_IN_CLASS (x) = DECL_BUILT_IN_CLASS (oldglobal);
2375 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2377 /* Keep the arg types from a file-scope fcn defn. */
2378 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2379 && DECL_INITIAL (oldglobal)
2380 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2381 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2386 /* This case is probably sometimes the right thing to do. */
2387 /* If we have a local external declaration,
2388 then any file-scope declaration should not
2389 have been static. */
2390 if (oldlocal == 0 && oldglobal != 0
2391 && !TREE_PUBLIC (oldglobal)
2392 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2393 warning ("`%s' locally external but globally static",
2394 IDENTIFIER_POINTER (name));
2397 /* If we have a local external declaration,
2398 and no file-scope declaration has yet been seen,
2399 then if we later have a file-scope decl it must not be static. */
2401 && DECL_EXTERNAL (x)
2405 TREE_PUBLIC (name) = 1;
2407 /* Save this decl, so that we can do type checking against
2408 other decls after it falls out of scope.
2410 Only save it once. This prevents temporary decls created in
2411 expand_inline_function from being used here, since this
2412 will have been set when the inline function was parsed.
2413 It also helps give slightly better warnings. */
2414 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2415 IDENTIFIER_LIMBO_VALUE (name) = x;
2418 /* Warn if shadowing an argument at the top level of the body. */
2419 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2420 /* This warning doesn't apply to the parms of a nested fcn. */
2421 && ! current_binding_level->parm_flag
2422 /* Check that this is one level down from the parms. */
2423 && current_binding_level->level_chain->parm_flag
2424 /* Check that the decl being shadowed
2425 comes from the parm level, one level up. */
2426 && chain_member (oldlocal, current_binding_level->level_chain->names))
2428 if (TREE_CODE (oldlocal) == PARM_DECL)
2429 pedwarn ("declaration of `%s' shadows a parameter",
2430 IDENTIFIER_POINTER (name));
2432 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2433 IDENTIFIER_POINTER (name));
2436 /* Maybe warn if shadowing something else. */
2437 else if (warn_shadow && !DECL_EXTERNAL (x)
2438 /* No shadow warnings for internally generated vars. */
2439 && DECL_SOURCE_LINE (x) != 0
2440 /* No shadow warnings for vars made for inlining. */
2441 && ! DECL_FROM_INLINE (x))
2443 const char *id = IDENTIFIER_POINTER (name);
2445 if (TREE_CODE (x) == PARM_DECL
2446 && current_binding_level->level_chain->parm_flag)
2447 /* Don't warn about the parm names in function declarator
2448 within a function declarator.
2449 It would be nice to avoid warning in any function
2450 declarator in a declaration, as opposed to a definition,
2451 but there is no way to tell it's not a definition. */
2453 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2454 warning ("declaration of `%s' shadows a parameter", id);
2455 else if (oldlocal != 0)
2456 warning ("declaration of `%s' shadows previous local", id);
2457 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2458 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2459 warning ("declaration of `%s' shadows global declaration", id);
2462 /* If storing a local value, there may already be one (inherited).
2463 If so, record it for restoration when this binding level ends. */
2465 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2468 /* Keep count of variables in this level with incomplete type.
2469 If the input is erroneous, we can have error_mark in the type
2470 slot (e.g. "f(void a, ...)") - that doesn't count as an
2472 if (TREE_TYPE (x) != error_mark_node
2473 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2477 /* Put decls on list in reverse order.
2478 We will reverse them later if necessary. */
2479 TREE_CHAIN (x) = b->names;
2485 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2488 pushdecl_top_level (x)
2492 register struct binding_level *b = current_binding_level;
2494 current_binding_level = global_binding_level;
2496 current_binding_level = b;
2500 /* Generate an implicit declaration for identifier FUNCTIONID
2501 as a function of type int (). Print a warning if appropriate. */
2504 implicitly_declare (functionid)
2508 int traditional_warning = 0;
2509 /* Only one "implicit declaration" warning per identifier. */
2510 int implicit_warning;
2512 /* We used to reuse an old implicit decl here,
2513 but this loses with inline functions because it can clobber
2514 the saved decl chains. */
2516 if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2517 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2520 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2522 /* Warn of implicit decl following explicit local extern decl.
2523 This is probably a program designed for traditional C. */
2524 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2525 traditional_warning = 1;
2527 /* Warn once of an implicit declaration. */
2528 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2530 DECL_EXTERNAL (decl) = 1;
2531 TREE_PUBLIC (decl) = 1;
2533 /* Record that we have an implicit decl and this is it. */
2534 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2536 /* ANSI standard says implicit declarations are in the innermost block.
2537 So we record the decl in the standard fashion.
2538 If flag_traditional is set, pushdecl does it top-level. */
2541 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2542 maybe_objc_check_decl (decl);
2544 rest_of_decl_compilation (decl, NULL, 0, 0);
2546 if (implicit_warning)
2547 implicit_decl_warning (functionid);
2548 else if (warn_traditional && traditional_warning)
2549 warning ("function `%s' was previously declared within a block",
2550 IDENTIFIER_POINTER (functionid));
2552 /* Write a record describing this implicit function declaration to the
2553 prototypes file (if requested). */
2555 gen_aux_info_record (decl, 0, 1, 0);
2561 implicit_decl_warning (id)
2564 const char *name = IDENTIFIER_POINTER (id);
2565 if (mesg_implicit_function_declaration == 2)
2566 error ("implicit declaration of function `%s'", name);
2567 else if (mesg_implicit_function_declaration == 1)
2568 warning ("implicit declaration of function `%s'", name);
2571 /* Return zero if the declaration NEWDECL is valid
2572 when the declaration OLDDECL (assumed to be for the same name)
2573 has already been seen.
2574 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
2575 and 3 if it is a conflicting declaration. */
2578 redeclaration_error_message (newdecl, olddecl)
2579 tree newdecl, olddecl;
2581 if (TREE_CODE (newdecl) == TYPE_DECL)
2583 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2585 /* pushdecl creates distinct types for TYPE_DECLs by calling
2586 build_type_copy, so the above comparison generally fails. We do
2587 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2588 is equivalent to what this code used to do before the build_type_copy
2589 call. The variant type distinction should not matter for traditional
2590 code, because it doesn't have type qualifiers. */
2591 if (flag_traditional
2592 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
2594 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2598 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2600 /* Declarations of functions can insist on internal linkage
2601 but they can't be inconsistent with internal linkage,
2602 so there can be no error on that account.
2603 However defining the same name twice is no good. */
2604 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2605 /* However, defining once as extern inline and a second
2606 time in another way is ok. */
2607 && ! (DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2608 && ! (DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2612 else if (DECL_CONTEXT (newdecl) == NULL_TREE)
2614 /* Objects declared at top level: */
2615 /* If at least one is a reference, it's ok. */
2616 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2618 /* Reject two definitions. */
2619 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2621 /* Now we have two tentative defs, or one tentative and one real def. */
2622 /* Insist that the linkage match. */
2623 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2627 else if (current_binding_level->parm_flag
2628 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2632 /* Newdecl has block scope. If olddecl has block scope also, then
2633 reject two definitions, and reject a definition together with an
2634 external reference. Otherwise, it is OK, because newdecl must
2635 be an extern reference to olddecl. */
2636 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2637 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2643 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2644 Create one if none exists so far for the current function.
2645 This function is called for both label definitions and label references. */
2651 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2653 if (current_function_decl == 0)
2655 error ("label %s referenced outside of any function",
2656 IDENTIFIER_POINTER (id));
2660 /* Use a label already defined or ref'd with this name. */
2663 /* But not if it is inherited and wasn't declared to be inheritable. */
2664 if (DECL_CONTEXT (decl) != current_function_decl
2665 && ! C_DECLARED_LABEL_FLAG (decl))
2666 return shadow_label (id);
2670 decl = build_decl (LABEL_DECL, id, void_type_node);
2672 /* A label not explicitly declared must be local to where it's ref'd. */
2673 DECL_CONTEXT (decl) = current_function_decl;
2675 DECL_MODE (decl) = VOIDmode;
2677 /* Say where one reference is to the label,
2678 for the sake of the error if it is not defined. */
2679 DECL_SOURCE_LINE (decl) = lineno;
2680 DECL_SOURCE_FILE (decl) = input_filename;
2682 IDENTIFIER_LABEL_VALUE (id) = decl;
2684 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2689 /* Make a label named NAME in the current function,
2690 shadowing silently any that may be inherited from containing functions
2691 or containing scopes.
2693 Note that valid use, if the label being shadowed
2694 comes from another scope in the same function,
2695 requires calling declare_nonlocal_label right away. */
2701 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2707 /* Check to make sure that the label hasn't already been declared
2708 at this label scope */
2709 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2710 if (TREE_VALUE (dup) == decl)
2712 error ("duplicate label declaration `%s'",
2713 IDENTIFIER_POINTER (name));
2714 error_with_decl (TREE_VALUE (dup),
2715 "this is a previous declaration");
2716 /* Just use the previous declaration. */
2717 return lookup_label (name);
2720 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2721 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2724 return lookup_label (name);
2727 /* Define a label, specifying the location in the source file.
2728 Return the LABEL_DECL node for the label, if the definition is valid.
2729 Otherwise return 0. */
2732 define_label (filename, line, name)
2733 const char *filename;
2737 tree decl = lookup_label (name);
2739 /* If label with this name is known from an outer context, shadow it. */
2740 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2742 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2743 IDENTIFIER_LABEL_VALUE (name) = 0;
2744 decl = lookup_label (name);
2747 if (warn_traditional && !in_system_header && lookup_name (name))
2748 warning_with_file_and_line (filename, line,
2749 "traditional C lacks a separate namespace for labels, identifier `%s' conflicts",
2750 IDENTIFIER_POINTER (name));
2752 if (DECL_INITIAL (decl) != 0)
2754 error_with_file_and_line (filename, line, "duplicate label `%s'",
2755 IDENTIFIER_POINTER (name));
2760 /* Mark label as having been defined. */
2761 DECL_INITIAL (decl) = error_mark_node;
2762 /* Say where in the source. */
2763 DECL_SOURCE_FILE (decl) = filename;
2764 DECL_SOURCE_LINE (decl) = line;
2769 /* Return the list of declarations of the current level.
2770 Note that this list is in reverse order unless/until
2771 you nreverse it; and when you do nreverse it, you must
2772 store the result back using `storedecls' or you will lose. */
2777 return current_binding_level->names;
2780 /* Return the list of type-tags (for structs, etc) of the current level. */
2785 return current_binding_level->tags;
2788 /* Store the list of declarations of the current level.
2789 This is done for the parameter declarations of a function being defined,
2790 after they are modified in the light of any missing parameters. */
2796 current_binding_level->names = decls;
2799 /* Similarly, store the list of tags of the current level. */
2805 current_binding_level->tags = tags;
2808 /* Given NAME, an IDENTIFIER_NODE,
2809 return the structure (or union or enum) definition for that name.
2810 Searches binding levels from BINDING_LEVEL up to the global level.
2811 If THISLEVEL_ONLY is nonzero, searches only the specified context
2812 (but skips any tag-transparent contexts to find one that is
2813 meaningful for tags).
2814 CODE says which kind of type the caller wants;
2815 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2816 If the wrong kind of type is found, an error is reported. */
2819 lookup_tag (code, name, binding_level, thislevel_only)
2820 enum tree_code code;
2821 struct binding_level *binding_level;
2825 register struct binding_level *level;
2828 for (level = binding_level; level; level = level->level_chain)
2831 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2833 if (TREE_PURPOSE (tail) == name)
2835 if (TREE_CODE (TREE_VALUE (tail)) != code)
2837 /* Definition isn't the kind we were looking for. */
2838 pending_invalid_xref = name;
2839 pending_invalid_xref_file = input_filename;
2840 pending_invalid_xref_line = lineno;
2841 /* If in the same binding level as a declaration as a tag
2842 of a different type, this must not be allowed to
2843 shadow that tag, so give the error immediately.
2844 (For example, "struct foo; union foo;" is invalid.) */
2846 pending_xref_error ();
2848 return TREE_VALUE (tail);
2851 if (! level->tag_transparent)
2861 /* Print an error message now
2862 for a recent invalid struct, union or enum cross reference.
2863 We don't print them immediately because they are not invalid
2864 when used in the `struct foo;' construct for shadowing. */
2867 pending_xref_error ()
2869 if (pending_invalid_xref != 0)
2870 error_with_file_and_line (pending_invalid_xref_file,
2871 pending_invalid_xref_line,
2872 "`%s' defined as wrong kind of tag",
2873 IDENTIFIER_POINTER (pending_invalid_xref));
2874 pending_invalid_xref = 0;
2877 /* Given a type, find the tag that was defined for it and return the tag name.
2878 Otherwise return 0. */
2881 lookup_tag_reverse (type)
2884 register struct binding_level *level;
2886 for (level = current_binding_level; level; level = level->level_chain)
2889 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2891 if (TREE_VALUE (tail) == type)
2892 return TREE_PURPOSE (tail);
2898 /* Look up NAME in the current binding level and its superiors
2899 in the namespace of variables, functions and typedefs.
2900 Return a ..._DECL node of some kind representing its definition,
2901 or return 0 if it is undefined. */
2909 if (current_binding_level != global_binding_level
2910 && IDENTIFIER_LOCAL_VALUE (name))
2911 val = IDENTIFIER_LOCAL_VALUE (name);
2913 val = IDENTIFIER_GLOBAL_VALUE (name);
2917 /* Similar to `lookup_name' but look only at current binding level. */
2920 lookup_name_current_level (name)
2925 if (current_binding_level == global_binding_level)
2926 return IDENTIFIER_GLOBAL_VALUE (name);
2928 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2931 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2932 if (DECL_NAME (t) == name)
2938 /* Mark ARG for GC. */
2941 mark_binding_level (arg)
2944 struct binding_level *level = *(struct binding_level **) arg;
2946 for (; level != 0; level = level->level_chain)
2948 ggc_mark_tree (level->names);
2949 ggc_mark_tree (level->tags);
2950 ggc_mark_tree (level->shadowed);
2951 ggc_mark_tree (level->blocks);
2952 ggc_mark_tree (level->this_block);
2953 ggc_mark_tree (level->parm_order);
2957 /* Create the predefined scalar types of C,
2958 and some nodes representing standard constants (0, 1, (void *) 0).
2959 Initialize the global binding level.
2960 Make definitions for built-in primitive functions. */
2963 init_decl_processing ()
2965 register tree endlink;
2966 tree ptr_ftype_void, ptr_ftype_ptr;
2968 current_function_decl = NULL;
2969 named_labels = NULL;
2970 current_binding_level = NULL_BINDING_LEVEL;
2971 free_binding_level = NULL_BINDING_LEVEL;
2973 /* Make the binding_level structure for global names. */
2975 global_binding_level = current_binding_level;
2977 build_common_tree_nodes (flag_signed_char);
2979 c_common_nodes_and_builtins ();
2981 boolean_type_node = integer_type_node;
2982 boolean_true_node = integer_one_node;
2983 boolean_false_node = integer_zero_node;
2985 /* With GCC, C99's _Bool is always of size 1. */
2986 c_bool_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
2987 TREE_SET_CODE (c_bool_type_node, BOOLEAN_TYPE);
2988 TYPE_MAX_VALUE (c_bool_type_node) = build_int_2 (1, 0);
2989 TREE_TYPE (TYPE_MAX_VALUE (c_bool_type_node)) = c_bool_type_node;
2990 TYPE_PRECISION (c_bool_type_node) = 1;
2991 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2993 c_bool_false_node = build_int_2 (0, 0);
2994 TREE_TYPE (c_bool_false_node) = c_bool_type_node;
2995 c_bool_true_node = build_int_2 (1, 0);
2996 TREE_TYPE (c_bool_true_node) = c_bool_type_node;
2998 endlink = void_list_node;
2999 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
3001 = build_function_type (ptr_type_node,
3002 tree_cons (NULL_TREE, ptr_type_node, endlink));
3004 /* Types which are common to the fortran compiler and libf2c. When
3005 changing these, you also need to be concerned with f/com.h. */
3007 if (TYPE_PRECISION (float_type_node)
3008 == TYPE_PRECISION (long_integer_type_node))
3010 g77_integer_type_node = long_integer_type_node;
3011 g77_uinteger_type_node = long_unsigned_type_node;
3013 else if (TYPE_PRECISION (float_type_node)
3014 == TYPE_PRECISION (integer_type_node))
3016 g77_integer_type_node = integer_type_node;
3017 g77_uinteger_type_node = unsigned_type_node;
3020 g77_integer_type_node = g77_uinteger_type_node = NULL_TREE;
3022 if (g77_integer_type_node != NULL_TREE)
3024 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_integer"),
3025 g77_integer_type_node));
3026 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_uinteger"),
3027 g77_uinteger_type_node));
3030 if (TYPE_PRECISION (float_type_node) * 2
3031 == TYPE_PRECISION (long_integer_type_node))
3033 g77_longint_type_node = long_integer_type_node;
3034 g77_ulongint_type_node = long_unsigned_type_node;
3036 else if (TYPE_PRECISION (float_type_node) * 2
3037 == TYPE_PRECISION (long_long_integer_type_node))
3039 g77_longint_type_node = long_long_integer_type_node;
3040 g77_ulongint_type_node = long_long_unsigned_type_node;
3043 g77_longint_type_node = g77_ulongint_type_node = NULL_TREE;
3045 if (g77_longint_type_node != NULL_TREE)
3047 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_longint"),
3048 g77_longint_type_node));
3049 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_ulongint"),
3050 g77_ulongint_type_node));
3053 pedantic_lvalues = pedantic;
3055 make_fname_decl = c_make_fname_decl;
3056 start_fname_decls ();
3058 /* Prepare to check format strings against argument lists. */
3059 init_function_format_info ();
3061 incomplete_decl_finalize_hook = finish_incomplete_decl;
3063 /* Record our roots. */
3065 ggc_add_tree_root (c_global_trees, CTI_MAX);
3066 ggc_add_root (&c_stmt_tree, 1, sizeof c_stmt_tree, mark_stmt_tree);
3067 ggc_add_tree_root (&c_scope_stmt_stack, 1);
3068 ggc_add_tree_root (&named_labels, 1);
3069 ggc_add_tree_root (&shadowed_labels, 1);
3070 ggc_add_root (¤t_binding_level, 1, sizeof current_binding_level,
3071 mark_binding_level);
3072 ggc_add_root (&label_level_chain, 1, sizeof label_level_chain,
3073 mark_binding_level);
3074 ggc_add_tree_root (&static_ctors, 1);
3075 ggc_add_tree_root (&static_dtors, 1);
3078 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3079 decl, NAME is the initialization string and TYPE_DEP indicates whether
3080 NAME depended on the type of the function. As we don't yet implement
3081 delayed emission of static data, we mark the decl as emitted
3082 so it is not placed in the output. Anything using it must therefore pull
3083 out the STRING_CST initializer directly. This does mean that these names
3084 are string merging candidates, which is wrong for C99's __func__. FIXME. */
3087 c_make_fname_decl (id, type_dep)
3091 const char *name = fname_as_string (type_dep);
3092 tree decl, type, init;
3093 size_t length = strlen (name);
3095 type = build_array_type
3096 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
3097 build_index_type (size_int (length)));
3099 decl = build_decl (VAR_DECL, id, type);
3100 /* We don't push the decl, so have to set its context here. */
3101 DECL_CONTEXT (decl) = current_function_decl;
3103 TREE_STATIC (decl) = 1;
3104 TREE_READONLY (decl) = 1;
3105 DECL_ARTIFICIAL (decl) = 1;
3107 init = build_string (length + 1, name);
3108 TREE_TYPE (init) = type;
3109 DECL_INITIAL (decl) = init;
3111 TREE_USED (decl) = 1;
3113 finish_decl (decl, init, NULL_TREE);
3118 /* Return a definition for a builtin function named NAME and whose data type
3119 is TYPE. TYPE should be a function type with argument types.
3120 FUNCTION_CODE tells later passes how to compile calls to this function.
3121 See tree.h for its possible values.
3123 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3124 the name to be called if we can't opencode the function. */
3127 builtin_function (name, type, function_code, class, library_name)
3131 enum built_in_class class;
3132 const char *library_name;
3134 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3135 DECL_EXTERNAL (decl) = 1;
3136 TREE_PUBLIC (decl) = 1;
3137 /* If -traditional, permit redefining a builtin function any way you like.
3138 (Though really, if the program redefines these functions,
3139 it probably won't work right unless compiled with -fno-builtin.) */
3140 if (flag_traditional && name[0] != '_')
3141 DECL_BUILT_IN_NONANSI (decl) = 1;
3143 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
3144 make_decl_rtl (decl, NULL);
3146 DECL_BUILT_IN_CLASS (decl) = class;
3147 DECL_FUNCTION_CODE (decl) = function_code;
3149 /* Warn if a function in the namespace for users
3150 is used without an occasion to consider it declared. */
3151 if (name[0] != '_' || name[1] != '_')
3152 C_DECL_ANTICIPATED (decl) = 1;
3157 /* Called when a declaration is seen that contains no names to declare.
3158 If its type is a reference to a structure, union or enum inherited
3159 from a containing scope, shadow that tag name for the current scope
3160 with a forward reference.
3161 If its type defines a new named structure or union
3162 or defines an enum, it is valid but we need not do anything here.
3163 Otherwise, it is an error. */
3166 shadow_tag (declspecs)
3169 shadow_tag_warned (declspecs, 0);
3173 shadow_tag_warned (declspecs, warned)
3176 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3183 pending_invalid_xref = 0;
3185 /* Remove the attributes from declspecs, since they will confuse the
3187 split_specs_attrs (declspecs, &specs, &attrs);
3189 for (link = specs; link; link = TREE_CHAIN (link))
3191 register tree value = TREE_VALUE (link);
3192 register enum tree_code code = TREE_CODE (value);
3194 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3195 /* Used to test also that TYPE_SIZE (value) != 0.
3196 That caused warning for `struct foo;' at top level in the file. */
3198 register tree name = lookup_tag_reverse (value);
3205 if (warned != 1 && code != ENUMERAL_TYPE)
3206 /* Empty unnamed enum OK */
3208 pedwarn ("unnamed struct/union that defines no instances");
3214 t = lookup_tag (code, name, current_binding_level, 1);
3218 t = make_node (code);
3225 if (!warned && ! in_system_header)
3227 warning ("useless keyword or type name in empty declaration");
3234 error ("two types specified in one empty declaration");
3239 pedwarn ("empty declaration");
3243 /* Construct an array declarator. EXPR is the expression inside [], or
3244 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
3245 to the pointer to which a parameter array is converted). STATIC_P is
3246 non-zero if "static" is inside the [], zero otherwise. VLA_UNSPEC_P
3247 is non-zero is the array is [*], a VLA of unspecified length which is
3248 nevertheless a complete type (not currently implemented by GCC),
3249 zero otherwise. The declarator is constructed as an ARRAY_REF
3250 (to be decoded by grokdeclarator), whose operand 0 is what's on the
3251 left of the [] (filled by in set_array_declarator_type) and operand 1
3252 is the expression inside; whose TREE_TYPE is the type qualifiers and
3253 which has TREE_STATIC set if "static" is used. */
3256 build_array_declarator (expr, quals, static_p, vla_unspec_p)
3263 decl = build_nt (ARRAY_REF, NULL_TREE, expr);
3264 TREE_TYPE (decl) = quals;
3265 TREE_STATIC (decl) = (static_p ? 1 : 0);
3266 if (pedantic && !flag_isoc99)
3268 if (static_p || quals != NULL_TREE)
3269 pedwarn ("ISO C89 does not support `static' or type qualifiers in parameter array declarators");
3271 pedwarn ("ISO C89 does not support `[*]' array declarators");
3274 warning ("GCC does not yet properly implement `[*]' array declarators");
3278 /* Set the type of an array declarator. DECL is the declarator, as
3279 constructed by build_array_declarator; TYPE is what appears on the left
3280 of the [] and goes in operand 0. ABSTRACT_P is non-zero if it is an
3281 abstract declarator, zero otherwise; this is used to reject static and
3282 type qualifiers in abstract declarators, where they are not in the
3286 set_array_declarator_type (decl, type, abstract_p)
3291 TREE_OPERAND (decl, 0) = type;
3292 if (abstract_p && (TREE_TYPE (decl) != NULL_TREE || TREE_STATIC (decl)))
3293 error ("static or type qualifiers in abstract declarator");
3297 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3300 groktypename (typename)
3303 if (TREE_CODE (typename) != TREE_LIST)
3305 return grokdeclarator (TREE_VALUE (typename),
3306 TREE_PURPOSE (typename),
3310 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3313 groktypename_in_parm_context (typename)
3316 if (TREE_CODE (typename) != TREE_LIST)
3318 return grokdeclarator (TREE_VALUE (typename),
3319 TREE_PURPOSE (typename),
3323 /* Decode a declarator in an ordinary declaration or data definition.
3324 This is called as soon as the type information and variable name
3325 have been parsed, before parsing the initializer if any.
3326 Here we create the ..._DECL node, fill in its type,
3327 and put it on the list of decls for the current context.
3328 The ..._DECL node is returned as the value.
3330 Exception: for arrays where the length is not specified,
3331 the type is left null, to be filled in by `finish_decl'.
3333 Function definitions do not come here; they go to start_function
3334 instead. However, external and forward declarations of functions
3335 do go through here. Structure field declarations are done by
3336 grokfield and not through here. */
3339 start_decl (declarator, declspecs, initialized, attributes)
3340 tree declarator, declspecs;
3344 register tree decl = grokdeclarator (declarator, declspecs,
3345 NORMAL, initialized);
3348 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3349 && MAIN_NAME_P (DECL_NAME (decl)))
3350 warning_with_decl (decl, "`%s' is usually a function");
3353 /* Is it valid for this decl to have an initializer at all?
3354 If not, set INITIALIZED to zero, which will indirectly
3355 tell `finish_decl' to ignore the initializer once it is parsed. */
3356 switch (TREE_CODE (decl))
3359 /* typedef foo = bar means give foo the same type as bar.
3360 We haven't parsed bar yet, so `finish_decl' will fix that up.
3361 Any other case of an initialization in a TYPE_DECL is an error. */
3362 if (pedantic || list_length (declspecs) > 1)
3364 error ("typedef `%s' is initialized",
3365 IDENTIFIER_POINTER (DECL_NAME (decl)));
3371 error ("function `%s' is initialized like a variable",
3372 IDENTIFIER_POINTER (DECL_NAME (decl)));
3377 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3378 error ("parameter `%s' is initialized",
3379 IDENTIFIER_POINTER (DECL_NAME (decl)));
3384 /* Don't allow initializations for incomplete types
3385 except for arrays which might be completed by the initialization. */
3387 /* This can happen if the array size is an undefined macro. We already
3388 gave a warning, so we don't need another one. */
3389 if (TREE_TYPE (decl) == error_mark_node)
3391 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3393 /* A complete type is ok if size is fixed. */
3395 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3396 || C_DECL_VARIABLE_SIZE (decl))
3398 error ("variable-sized object may not be initialized");
3402 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3404 error ("variable `%s' has initializer but incomplete type",
3405 IDENTIFIER_POINTER (DECL_NAME (decl)));
3408 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
3410 error ("elements of array `%s' have incomplete type",
3411 IDENTIFIER_POINTER (DECL_NAME (decl)));
3419 /* Seems redundant with grokdeclarator. */
3420 if (current_binding_level != global_binding_level
3421 && DECL_EXTERNAL (decl)
3422 && TREE_CODE (decl) != FUNCTION_DECL)
3423 warning ("declaration of `%s' has `extern' and is initialized",
3424 IDENTIFIER_POINTER (DECL_NAME (decl)));
3426 DECL_EXTERNAL (decl) = 0;
3427 if (current_binding_level == global_binding_level)
3428 TREE_STATIC (decl) = 1;
3430 /* Tell `pushdecl' this is an initialized decl
3431 even though we don't yet have the initializer expression.
3432 Also tell `finish_decl' it may store the real initializer. */
3433 DECL_INITIAL (decl) = error_mark_node;
3436 /* If this is a function declaration, write a record describing it to the
3437 prototypes file (if requested). */
3439 if (TREE_CODE (decl) == FUNCTION_DECL)
3440 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3442 /* ANSI specifies that a tentative definition which is not merged with
3443 a non-tentative definition behaves exactly like a definition with an
3444 initializer equal to zero. (Section 3.7.2)
3445 -fno-common gives strict ANSI behavior. Usually you don't want it.
3446 This matters only for variables with external linkage. */
3447 if (! flag_no_common || ! TREE_PUBLIC (decl))
3448 DECL_COMMON (decl) = 1;
3450 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
3451 SET_DEFAULT_DECL_ATTRIBUTES (decl, attributes);
3454 /* Set attributes here so if duplicate decl, will have proper attributes. */
3455 decl_attributes (decl, attributes);
3457 /* Add this decl to the current binding level.
3458 TEM may equal DECL or it may be a previous decl of the same name. */
3459 tem = pushdecl (decl);
3461 /* For a local variable, define the RTL now. */
3462 if (current_binding_level != global_binding_level
3463 /* But not if this is a duplicate decl
3464 and we preserved the rtl from the previous one
3465 (which may or may not happen). */
3466 && !DECL_RTL_SET_P (tem)
3467 && !DECL_CONTEXT (tem))
3469 if (TREE_TYPE (tem) != error_mark_node
3470 && COMPLETE_TYPE_P (TREE_TYPE (tem)))
3472 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3473 && DECL_INITIAL (tem) != 0)
3480 /* Finish processing of a declaration;
3481 install its initial value.
3482 If the length of an array type is not known before,
3483 it must be determined now, from the initial value, or it is an error. */
3486 finish_decl (decl, init, asmspec_tree)
3490 register tree type = TREE_TYPE (decl);
3491 int was_incomplete = (DECL_SIZE (decl) == 0);
3492 const char *asmspec = 0;
3494 /* If a name was specified, get the string. */
3496 asmspec = TREE_STRING_POINTER (asmspec_tree);
3498 /* If `start_decl' didn't like having an initialization, ignore it now. */
3499 if (init != 0 && DECL_INITIAL (decl) == 0)
3502 /* Don't crash if parm is initialized. */
3503 if (TREE_CODE (decl) == PARM_DECL)
3508 if (TREE_CODE (decl) != TYPE_DECL)
3509 store_init_value (decl, init);
3512 /* typedef foo = bar; store the type of bar as the type of foo. */
3513 TREE_TYPE (decl) = TREE_TYPE (init);
3514 DECL_INITIAL (decl) = init = 0;
3518 /* Deduce size of array from initialization, if not already known */
3519 if (TREE_CODE (type) == ARRAY_TYPE
3520 && TYPE_DOMAIN (type) == 0
3521 && TREE_CODE (decl) != TYPE_DECL)
3524 = (TREE_STATIC (decl)
3525 /* Even if pedantic, an external linkage array
3526 may have incomplete type at first. */
3527 ? pedantic && !TREE_PUBLIC (decl)
3528 : !DECL_EXTERNAL (decl));
3530 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3532 /* Get the completed type made by complete_array_type. */
3533 type = TREE_TYPE (decl);
3536 error_with_decl (decl, "initializer fails to determine size of `%s'");
3538 else if (failure == 2)
3541 error_with_decl (decl, "array size missing in `%s'");
3542 /* If a `static' var's size isn't known,
3543 make it extern as well as static, so it does not get
3545 If it is not `static', then do not mark extern;
3546 finish_incomplete_decl will give it a default size
3547 and it will get allocated. */
3548 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3549 DECL_EXTERNAL (decl) = 1;
3552 /* TYPE_MAX_VALUE is always one less than the number of elements
3553 in the array, because we start counting at zero. Therefore,
3554 warn only if the value is less than zero. */
3555 else if (pedantic && TYPE_DOMAIN (type) != 0
3556 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3557 error_with_decl (decl, "zero or negative size array `%s'");
3559 layout_decl (decl, 0);
3562 if (TREE_CODE (decl) == VAR_DECL)
3564 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
3565 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3566 layout_decl (decl, 0);
3568 if (DECL_SIZE (decl) == 0
3569 /* Don't give an error if we already gave one earlier. */
3570 && TREE_TYPE (decl) != error_mark_node
3571 && (TREE_STATIC (decl)
3573 /* A static variable with an incomplete type
3574 is an error if it is initialized.
3575 Also if it is not file scope.
3576 Otherwise, let it through, but if it is not `extern'
3577 then it may cause an error message later. */
3578 (DECL_INITIAL (decl) != 0
3579 || DECL_CONTEXT (decl) != 0)
3581 /* An automatic variable with an incomplete type
3583 !DECL_EXTERNAL (decl)))
3585 error_with_decl (decl, "storage size of `%s' isn't known");
3586 TREE_TYPE (decl) = error_mark_node;
3589 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3590 && DECL_SIZE (decl) != 0)
3592 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3593 constant_expression_warning (DECL_SIZE (decl));
3595 error_with_decl (decl, "storage size of `%s' isn't constant");
3598 if (TREE_USED (type))
3599 TREE_USED (decl) = 1;
3602 /* If this is a function and an assembler name is specified, it isn't
3603 builtin any more. Also reset DECL_RTL so we can give it its new
3605 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3607 DECL_BUILT_IN_CLASS (decl) = NOT_BUILT_IN;
3608 SET_DECL_RTL (decl, NULL_RTX);
3609 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
3612 /* Output the assembler code and/or RTL code for variables and functions,
3613 unless the type is an undefined structure or union.
3614 If not, it will get done when the type is completed. */
3616 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3618 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3619 maybe_objc_check_decl (decl);
3621 if (!DECL_CONTEXT (decl))
3623 if (DECL_INITIAL (decl) == NULL_TREE
3624 || DECL_INITIAL (decl) == error_mark_node)
3625 /* Don't output anything
3626 when a tentative file-scope definition is seen.
3627 But at end of compilation, do output code for them. */
3628 DECL_DEFER_OUTPUT (decl) = 1;
3629 rest_of_decl_compilation (decl, asmspec,
3630 (DECL_CONTEXT (decl) == 0
3631 || TREE_ASM_WRITTEN (decl)), 0);
3635 /* This is a local variable. If there is an ASMSPEC, the
3636 user has requested that we handle it specially. */
3639 /* In conjunction with an ASMSPEC, the `register'
3640 keyword indicates that we should place the variable
3641 in a particular register. */
3642 if (DECL_REGISTER (decl))
3643 DECL_C_HARD_REGISTER (decl) = 1;
3645 /* If this is not a static variable, issue a warning.
3646 It doesn't make any sense to give an ASMSPEC for an
3647 ordinary, non-register local variable. Historically,
3648 GCC has accepted -- but ignored -- the ASMSPEC in
3650 if (TREE_CODE (decl) == VAR_DECL
3651 && !DECL_REGISTER (decl)
3652 && !TREE_STATIC (decl))
3653 warning_with_decl (decl,
3654 "ignoring asm-specifier for non-static local variable `%s'");
3656 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
3659 add_decl_stmt (decl);
3662 if (DECL_CONTEXT (decl) != 0)
3664 /* Recompute the RTL of a local array now
3665 if it used to be an incomplete type. */
3667 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3669 /* If we used it already as memory, it must stay in memory. */
3670 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3671 /* If it's still incomplete now, no init will save it. */
3672 if (DECL_SIZE (decl) == 0)
3673 DECL_INITIAL (decl) = 0;
3678 if (TREE_CODE (decl) == TYPE_DECL)
3680 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3681 maybe_objc_check_decl (decl);
3682 rest_of_decl_compilation (decl, NULL, DECL_CONTEXT (decl) == 0, 0);
3685 /* At the end of a declaration, throw away any variable type sizes
3686 of types defined inside that declaration. There is no use
3687 computing them in the following function definition. */
3688 if (current_binding_level == global_binding_level)
3689 get_pending_sizes ();
3692 /* If DECL has a cleanup, build and return that cleanup here.
3693 This is a callback called by expand_expr. */
3696 maybe_build_cleanup (decl)
3697 tree decl ATTRIBUTE_UNUSED;
3699 /* There are no cleanups in C. */
3703 /* Given a parsed parameter declaration,
3704 decode it into a PARM_DECL and push that on the current binding level.
3705 Also, for the sake of forward parm decls,
3706 record the given order of parms in `parm_order'. */
3709 push_parm_decl (parm)
3713 int old_immediate_size_expand = immediate_size_expand;
3714 /* Don't try computing parm sizes now -- wait till fn is called. */
3715 immediate_size_expand = 0;
3717 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3718 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3719 decl_attributes (decl, TREE_VALUE (parm));
3722 if (DECL_NAME (decl))
3725 olddecl = lookup_name (DECL_NAME (decl));
3726 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3727 pedwarn_with_decl (decl,
3728 "ANSI C forbids parameter `%s' shadowing typedef");
3732 decl = pushdecl (decl);
3734 immediate_size_expand = old_immediate_size_expand;
3736 current_binding_level->parm_order
3737 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3739 /* Add this decl to the current binding level. */
3740 finish_decl (decl, NULL_TREE, NULL_TREE);
3743 /* Clear the given order of parms in `parm_order'.
3744 Used at start of parm list,
3745 and also at semicolon terminating forward decls. */
3750 current_binding_level->parm_order = NULL_TREE;
3753 /* Make TYPE a complete type based on INITIAL_VALUE.
3754 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3755 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3758 complete_array_type (type, initial_value, do_default)
3763 register tree maxindex = NULL_TREE;
3768 /* Note MAXINDEX is really the maximum index,
3769 one less than the size. */
3770 if (TREE_CODE (initial_value) == STRING_CST)
3773 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3774 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3777 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3779 tree elts = CONSTRUCTOR_ELTS (initial_value);
3780 maxindex = build_int_2 (-1, -1);
3781 for (; elts; elts = TREE_CHAIN (elts))
3783 if (TREE_PURPOSE (elts))
3784 maxindex = TREE_PURPOSE (elts);
3786 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3787 maxindex, integer_one_node));
3789 maxindex = copy_node (maxindex);
3793 /* Make an error message unless that happened already. */
3794 if (initial_value != error_mark_node)
3797 /* Prevent further error messages. */
3798 maxindex = build_int_2 (0, 0);
3805 maxindex = build_int_2 (0, 0);
3811 TYPE_DOMAIN (type) = build_index_type (maxindex);
3812 if (!TREE_TYPE (maxindex))
3813 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3816 /* Lay out the type now that we can get the real answer. */
3823 /* Given declspecs and a declarator,
3824 determine the name and type of the object declared
3825 and construct a ..._DECL node for it.
3826 (In one case we can return a ..._TYPE node instead.
3827 For invalid input we sometimes return 0.)
3829 DECLSPECS is a chain of tree_list nodes whose value fields
3830 are the storage classes and type specifiers.
3832 DECL_CONTEXT says which syntactic context this declaration is in:
3833 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3834 FUNCDEF for a function definition. Like NORMAL but a few different
3835 error messages in each case. Return value may be zero meaning
3836 this definition is too screwy to try to parse.
3837 PARM for a parameter declaration (either within a function prototype
3838 or before a function body). Make a PARM_DECL, or return void_type_node.
3839 TYPENAME if for a typename (in a cast or sizeof).
3840 Don't make a DECL node; just return the ..._TYPE node.
3841 FIELD for a struct or union field; make a FIELD_DECL.
3842 BITFIELD for a field with specified width.
3843 INITIALIZED is 1 if the decl has an initializer.
3845 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3846 It may also be so in the PARM case, for a prototype where the
3847 argument type is specified but not the name.
3849 This function is where the complicated C meanings of `static'
3850 and `extern' are interpreted. */
3853 grokdeclarator (declarator, declspecs, decl_context, initialized)
3856 enum decl_context decl_context;
3861 tree type = NULL_TREE;
3866 int type_quals = TYPE_UNQUALIFIED;
3868 int explicit_int = 0;
3869 int explicit_char = 0;
3870 int defaulted_int = 0;
3871 tree typedef_decl = 0;
3873 tree typedef_type = 0;
3874 int funcdef_flag = 0;
3875 enum tree_code innermost_code = ERROR_MARK;
3877 int size_varies = 0;
3878 tree decl_machine_attr = NULL_TREE;
3879 tree array_ptr_quals = NULL_TREE;
3880 int array_parm_static = 0;
3882 if (decl_context == BITFIELD)
3883 bitfield = 1, decl_context = FIELD;
3885 if (decl_context == FUNCDEF)
3886 funcdef_flag = 1, decl_context = NORMAL;
3888 /* Look inside a declarator for the name being declared
3889 and get it as a string, for an error message. */
3891 register tree decl = declarator;
3895 switch (TREE_CODE (decl))
3900 innermost_code = TREE_CODE (decl);
3901 decl = TREE_OPERAND (decl, 0);
3904 case IDENTIFIER_NODE:
3905 name = IDENTIFIER_POINTER (decl);
3916 /* A function definition's declarator must have the form of
3917 a function declarator. */
3919 if (funcdef_flag && innermost_code != CALL_EXPR)
3922 /* Anything declared one level down from the top level
3923 must be one of the parameters of a function
3924 (because the body is at least two levels down). */
3926 /* If this looks like a function definition, make it one,
3927 even if it occurs where parms are expected.
3928 Then store_parm_decls will reject it and not use it as a parm. */
3929 if (decl_context == NORMAL && !funcdef_flag
3930 && current_binding_level->parm_flag)
3931 decl_context = PARM;
3933 /* Look through the decl specs and record which ones appear.
3934 Some typespecs are defined as built-in typenames.
3935 Others, the ones that are modifiers of other types,
3936 are represented by bits in SPECBITS: set the bits for
3937 the modifiers that appear. Storage class keywords are also in SPECBITS.
3939 If there is a typedef name or a type, store the type in TYPE.
3940 This includes builtin typedefs such as `int'.
3942 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3943 and did not come from a user typedef.
3945 Set LONGLONG if `long' is mentioned twice. */
3947 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3949 register tree id = TREE_VALUE (spec);
3951 if (id == ridpointers[(int) RID_INT])
3953 if (id == ridpointers[(int) RID_CHAR])
3956 if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
3958 enum rid i = C_RID_CODE (id);
3959 if ((int) i <= (int) RID_LAST_MODIFIER)
3961 if (i == RID_LONG && (specbits & (1 << (int) i)))
3964 error ("`long long long' is too long for GCC");
3967 if (pedantic && !flag_isoc99 && ! in_system_header
3969 pedwarn ("ISO C89 does not support `long long'");
3973 else if (specbits & (1 << (int) i))
3974 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3975 specbits |= 1 << (int) i;
3980 error ("two or more data types in declaration of `%s'", name);
3981 /* Actual typedefs come to us as TYPE_DECL nodes. */
3982 else if (TREE_CODE (id) == TYPE_DECL)
3984 type = TREE_TYPE (id);
3985 decl_machine_attr = DECL_MACHINE_ATTRIBUTES (id);
3988 /* Built-in types come as identifiers. */
3989 else if (TREE_CODE (id) == IDENTIFIER_NODE)
3991 register tree t = lookup_name (id);
3992 if (TREE_TYPE (t) == error_mark_node)
3994 else if (!t || TREE_CODE (t) != TYPE_DECL)
3995 error ("`%s' fails to be a typedef or built in type",
3996 IDENTIFIER_POINTER (id));
3999 type = TREE_TYPE (t);
4003 else if (TREE_CODE (id) != ERROR_MARK)
4010 typedef_type = type;
4012 size_varies = C_TYPE_VARIABLE_SIZE (type);
4014 /* No type at all: default to `int', and set DEFAULTED_INT
4015 because it was not a user-defined typedef. */
4019 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4020 | (1 << (int) RID_SIGNED)
4021 | (1 << (int) RID_UNSIGNED)
4022 | (1 << (int) RID_COMPLEX))))
4023 /* Don't warn about typedef foo = bar. */
4024 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
4025 && ! in_system_header)
4027 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
4028 and this is a function, or if -Wimplicit; prefer the former
4029 warning since it is more explicit. */
4030 if ((warn_implicit_int || warn_return_type || flag_isoc99)
4032 warn_about_return_type = 1;
4033 else if (warn_implicit_int || flag_isoc99)
4034 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
4039 type = integer_type_node;
4042 /* Now process the modifiers that were specified
4043 and check for invalid combinations. */
4045 /* Long double is a special combination. */
4047 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4048 && TYPE_MAIN_VARIANT (type) == double_type_node)
4050 specbits &= ~(1 << (int) RID_LONG);
4051 type = long_double_type_node;
4054 /* Check all other uses of type modifiers. */
4056 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4057 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4061 if ((specbits & 1 << (int) RID_LONG)
4062 && (specbits & 1 << (int) RID_SHORT))
4063 error ("both long and short specified for `%s'", name);
4064 else if (((specbits & 1 << (int) RID_LONG)
4065 || (specbits & 1 << (int) RID_SHORT))
4067 error ("long or short specified with char for `%s'", name);
4068 else if (((specbits & 1 << (int) RID_LONG)
4069 || (specbits & 1 << (int) RID_SHORT))
4070 && TREE_CODE (type) == REAL_TYPE)
4072 static int already = 0;
4074 error ("long or short specified with floating type for `%s'", name);
4075 if (! already && ! pedantic)
4077 error ("the only valid combination is `long double'");
4081 else if ((specbits & 1 << (int) RID_SIGNED)
4082 && (specbits & 1 << (int) RID_UNSIGNED))
4083 error ("both signed and unsigned specified for `%s'", name);
4084 else if (TREE_CODE (type) != INTEGER_TYPE)
4085 error ("long, short, signed or unsigned invalid for `%s'", name);
4089 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4091 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4093 if (flag_pedantic_errors)
4098 /* Discard the type modifiers if they are invalid. */
4101 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4102 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4107 if ((specbits & (1 << (int) RID_COMPLEX))
4108 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4110 error ("complex invalid for `%s'", name);
4111 specbits &= ~(1 << (int) RID_COMPLEX);
4114 /* Decide whether an integer type is signed or not.
4115 Optionally treat bitfields as signed by default. */
4116 if (specbits & 1 << (int) RID_UNSIGNED
4117 /* Traditionally, all bitfields are unsigned. */
4118 || (bitfield && flag_traditional
4119 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4120 || (bitfield && ! flag_signed_bitfields
4121 && (explicit_int || defaulted_int || explicit_char
4122 /* A typedef for plain `int' without `signed'
4123 can be controlled just like plain `int'. */
4124 || ! (typedef_decl != 0
4125 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4126 && TREE_CODE (type) != ENUMERAL_TYPE
4127 && !(specbits & 1 << (int) RID_SIGNED)))
4130 type = long_long_unsigned_type_node;
4131 else if (specbits & 1 << (int) RID_LONG)
4132 type = long_unsigned_type_node;
4133 else if (specbits & 1 << (int) RID_SHORT)
4134 type = short_unsigned_type_node;
4135 else if (type == char_type_node)
4136 type = unsigned_char_type_node;
4137 else if (typedef_decl)
4138 type = unsigned_type (type);
4140 type = unsigned_type_node;
4142 else if ((specbits & 1 << (int) RID_SIGNED)
4143 && type == char_type_node)
4144 type = signed_char_type_node;
4146 type = long_long_integer_type_node;
4147 else if (specbits & 1 << (int) RID_LONG)
4148 type = long_integer_type_node;
4149 else if (specbits & 1 << (int) RID_SHORT)
4150 type = short_integer_type_node;
4152 if (specbits & 1 << (int) RID_COMPLEX)
4154 if (pedantic && !flag_isoc99)
4155 pedwarn ("ISO C89 does not support complex types");
4156 /* If we just have "complex", it is equivalent to
4157 "complex double", but if any modifiers at all are specified it is
4158 the complex form of TYPE. E.g, "complex short" is
4159 "complex short int". */
4161 if (defaulted_int && ! longlong
4162 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4163 | (1 << (int) RID_SIGNED)
4164 | (1 << (int) RID_UNSIGNED))))
4167 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
4168 type = complex_double_type_node;
4170 else if (type == integer_type_node)
4173 pedwarn ("ISO C does not support complex integer types");
4174 type = complex_integer_type_node;
4176 else if (type == float_type_node)
4177 type = complex_float_type_node;
4178 else if (type == double_type_node)
4179 type = complex_double_type_node;
4180 else if (type == long_double_type_node)
4181 type = complex_long_double_type_node;
4185 pedwarn ("ISO C does not support complex integer types");
4186 type = build_complex_type (type);
4190 /* Figure out the type qualifiers for the declaration. There are
4191 two ways a declaration can become qualified. One is something
4192 like `const int i' where the `const' is explicit. Another is
4193 something like `typedef const int CI; CI i' where the type of the
4194 declaration contains the `const'. */
4195 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4196 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
4197 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4198 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4199 if (constp > 1 && ! flag_isoc99)
4200 pedwarn ("duplicate `const'");
4201 if (restrictp > 1 && ! flag_isoc99)
4202 pedwarn ("duplicate `restrict'");
4203 if (volatilep > 1 && ! flag_isoc99)
4204 pedwarn ("duplicate `volatile'");
4205 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
4206 type = TYPE_MAIN_VARIANT (type);
4207 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4208 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4209 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4211 /* Warn if two storage classes are given. Default to `auto'. */
4216 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4217 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4218 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4219 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4220 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4222 /* Warn about storage classes that are invalid for certain
4223 kinds of declarations (parameters, typenames, etc.). */
4226 error ("multiple storage classes in declaration of `%s'", name);
4227 else if (funcdef_flag
4229 & ((1 << (int) RID_REGISTER)
4230 | (1 << (int) RID_AUTO)
4231 | (1 << (int) RID_TYPEDEF))))
4233 if (specbits & 1 << (int) RID_AUTO
4234 && (pedantic || current_binding_level == global_binding_level))
4235 pedwarn ("function definition declared `auto'");
4236 if (specbits & 1 << (int) RID_REGISTER)
4237 error ("function definition declared `register'");
4238 if (specbits & 1 << (int) RID_TYPEDEF)
4239 error ("function definition declared `typedef'");
4240 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4241 | (1 << (int) RID_AUTO));
4243 else if (decl_context != NORMAL && nclasses > 0)
4245 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4249 switch (decl_context)
4252 error ("storage class specified for structure field `%s'",
4256 error ("storage class specified for parameter `%s'", name);
4259 error ("storage class specified for typename");
4262 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4263 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4264 | (1 << (int) RID_EXTERN));
4267 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4269 /* `extern' with initialization is invalid if not at top level. */
4270 if (current_binding_level == global_binding_level)
4271 warning ("`%s' initialized and declared `extern'", name);
4273 error ("`%s' has both `extern' and initializer", name);
4275 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4276 && current_binding_level != global_binding_level)
4277 error ("nested function `%s' declared `extern'", name);
4278 else if (current_binding_level == global_binding_level
4279 && specbits & (1 << (int) RID_AUTO))
4280 error ("top-level declaration of `%s' specifies `auto'", name);
4283 /* Now figure out the structure of the declarator proper.
4284 Descend through it, creating more complex types, until we reach
4285 the declared identifier (or NULL_TREE, in an absolute declarator). */
4287 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4289 if (type == error_mark_node)
4291 declarator = TREE_OPERAND (declarator, 0);
4295 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4296 an INDIRECT_REF (for *...),
4297 a CALL_EXPR (for ...(...)),
4298 an identifier (for the name being declared)
4299 or a null pointer (for the place in an absolute declarator
4300 where the name was omitted).
4301 For the last two cases, we have just exited the loop.
4303 At this point, TYPE is the type of elements of an array,
4304 or for a function to return, or for a pointer to point to.
4305 After this sequence of ifs, TYPE is the type of the
4306 array or function or pointer, and DECLARATOR has had its
4307 outermost layer removed. */
4309 if (array_ptr_quals != NULL_TREE || array_parm_static)
4311 /* Only the innermost declarator (making a parameter be of
4312 array type which is converted to pointer type)
4313 may have static or type qualifiers. */
4314 error ("static or type qualifiers in non-parameter array declarator");
4315 array_ptr_quals = NULL_TREE;
4316 array_parm_static = 0;
4319 if (TREE_CODE (declarator) == ARRAY_REF)
4321 register tree itype = NULL_TREE;
4322 register tree size = TREE_OPERAND (declarator, 1);
4323 /* The index is a signed object `sizetype' bits wide. */
4324 tree index_type = signed_type (sizetype);
4326 array_ptr_quals = TREE_TYPE (declarator);
4327 array_parm_static = TREE_STATIC (declarator);
4329 declarator = TREE_OPERAND (declarator, 0);
4331 /* Check for some types that there cannot be arrays of. */
4333 if (VOID_TYPE_P (type))
4335 error ("declaration of `%s' as array of voids", name);
4336 type = error_mark_node;
4339 if (TREE_CODE (type) == FUNCTION_TYPE)
4341 error ("declaration of `%s' as array of functions", name);
4342 type = error_mark_node;
4345 if (size == error_mark_node)
4346 type = error_mark_node;
4348 if (type == error_mark_node)
4351 /* If size was specified, set ITYPE to a range-type for that size.
4352 Otherwise, ITYPE remains null. finish_decl may figure it out
4353 from an initial value. */
4357 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4358 STRIP_TYPE_NOPS (size);
4360 if (! INTEGRAL_TYPE_P (TREE_TYPE (size)))
4362 error ("size of array `%s' has non-integer type", name);
4363 size = integer_one_node;
4366 if (pedantic && integer_zerop (size))
4367 pedwarn ("ISO C forbids zero-size array `%s'", name);
4369 if (TREE_CODE (size) == INTEGER_CST)
4371 constant_expression_warning (size);
4372 if (tree_int_cst_sgn (size) < 0)
4374 error ("size of array `%s' is negative", name);
4375 size = integer_one_node;
4380 /* Make sure the array size remains visibly nonconstant
4381 even if it is (eg) a const variable with known value. */
4386 if (TREE_CONSTANT (size))
4387 pedwarn ("ISO C89 forbids array `%s' whose size can't be evaluated",
4390 pedwarn ("ISO C89 forbids variable-size array `%s'",
4395 if (integer_zerop (size))
4397 /* A zero-length array cannot be represented with an
4398 unsigned index type, which is what we'll get with
4399 build_index_type. Create an open-ended range instead. */
4400 itype = build_range_type (sizetype, size, NULL_TREE);
4404 /* Compute the maximum valid index, that is, size - 1.
4405 Do the calculation in index_type, so that if it is
4406 a variable the computations will be done in the
4408 itype = fold (build (MINUS_EXPR, index_type,
4409 convert (index_type, size),
4410 convert (index_type, size_one_node)));
4412 /* If that overflowed, the array is too big.
4413 ??? While a size of INT_MAX+1 technically shouldn't
4414 cause an overflow (because we subtract 1), the overflow
4415 is recorded during the conversion to index_type, before
4416 the subtraction. Handling this case seems like an
4417 unnecessary complication. */
4418 if (TREE_OVERFLOW (itype))
4420 error ("size of array `%s' is too large", name);
4421 type = error_mark_node;
4426 itype = variable_size (itype);
4427 itype = build_index_type (itype);
4430 else if (decl_context == FIELD)
4432 /* ??? Need to check somewhere that this is a structure
4433 and not a union, that this field is last, and that
4434 this structure has at least one other named member. */
4436 if (pedantic && !flag_isoc99 && !in_system_header)
4437 pedwarn ("ISO C89 does not support flexible array members");
4439 /* ISO C99 Flexible array members are effectively identical
4440 to GCC's zero-length array extension. */
4441 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4444 /* If pedantic, complain about arrays of incomplete types. */
4446 if (pedantic && !COMPLETE_TYPE_P (type))
4447 pedwarn ("array type has incomplete element type");
4450 /* We shouldn't have a function type here at all!
4451 Functions aren't allowed as array elements. */
4452 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4453 && (constp || volatilep))
4454 pedwarn ("ANSI C forbids const or volatile function types");
4457 /* Build the array type itself, then merge any constancy or
4458 volatility into the target type. We must do it in this order
4459 to ensure that the TYPE_MAIN_VARIANT field of the array type
4460 is set correctly. */
4462 type = build_array_type (type, itype);
4464 type = c_build_qualified_type (type, type_quals);
4467 C_TYPE_VARIABLE_SIZE (type) = 1;
4469 /* The GCC extension for zero-length arrays differs from
4470 ISO flexible array members in that sizeof yields zero. */
4471 if (size && integer_zerop (size))
4474 TYPE_SIZE (type) = bitsize_zero_node;
4475 TYPE_SIZE_UNIT (type) = size_zero_node;
4477 if (decl_context != PARM
4478 && (array_ptr_quals != NULL_TREE || array_parm_static))
4480 error ("static or type qualifiers in non-parameter array declarator");
4481 array_ptr_quals = NULL_TREE;
4482 array_parm_static = 0;
4485 else if (TREE_CODE (declarator) == CALL_EXPR)
4489 /* Declaring a function type.
4490 Make sure we have a valid type for the function to return. */
4491 if (type == error_mark_node)
4496 /* Warn about some types functions can't return. */
4498 if (TREE_CODE (type) == FUNCTION_TYPE)
4500 error ("`%s' declared as function returning a function", name);
4501 type = integer_type_node;
4503 if (TREE_CODE (type) == ARRAY_TYPE)
4505 error ("`%s' declared as function returning an array", name);
4506 type = integer_type_node;
4509 #ifndef TRADITIONAL_RETURN_FLOAT
4510 /* Traditionally, declaring return type float means double. */
4512 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4513 type = double_type_node;
4514 #endif /* TRADITIONAL_RETURN_FLOAT */
4516 /* Construct the function type and go to the next
4517 inner layer of declarator. */
4519 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4521 /* Say it's a definition
4522 only for the CALL_EXPR
4523 closest to the identifier. */
4524 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4525 /* Type qualifiers before the return type of the function
4526 qualify the return type, not the function type. */
4529 /* Type qualifiers on a function return type are normally
4530 permitted by the standard but have no effect, so give a
4531 warning at -W. Qualifiers on a void return type have
4532 meaning as a GNU extension, and are banned on function
4533 definitions in ISO C. FIXME: strictly we shouldn't
4534 pedwarn for qualified void return types except on function
4535 definitions, but not doing so could lead to the undesirable
4536 state of a "volatile void" function return type not being
4537 warned about, and a use of the function being compiled
4538 with GNU semantics, with no diagnostics under -pedantic. */
4539 if (VOID_TYPE_P (type) && pedantic && !in_system_header)
4540 pedwarn ("ISO C forbids qualified void function return type");
4541 else if (extra_warnings
4542 && !(VOID_TYPE_P (type)
4543 && type_quals == TYPE_QUAL_VOLATILE))
4544 warning ("type qualifiers ignored on function return type");
4546 type = c_build_qualified_type (type, type_quals);
4548 type_quals = TYPE_UNQUALIFIED;
4550 type = build_function_type (type, arg_types);
4551 declarator = TREE_OPERAND (declarator, 0);
4553 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4554 the formal parameter list of this FUNCTION_TYPE to point to
4555 the FUNCTION_TYPE node itself. */
4560 for (link = last_function_parm_tags;
4562 link = TREE_CHAIN (link))
4563 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4566 else if (TREE_CODE (declarator) == INDIRECT_REF)
4568 /* Merge any constancy or volatility into the target type
4571 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4573 pedwarn ("ISO C forbids qualified function types");
4575 type = c_build_qualified_type (type, type_quals);
4576 type_quals = TYPE_UNQUALIFIED;
4579 type = build_pointer_type (type);
4581 /* Process a list of type modifier keywords
4582 (such as const or volatile) that were given inside the `*'. */
4584 if (TREE_TYPE (declarator))
4586 register tree typemodlist;
4592 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4593 typemodlist = TREE_CHAIN (typemodlist))
4595 tree qualifier = TREE_VALUE (typemodlist);
4597 if (C_IS_RESERVED_WORD (qualifier))
4599 if (C_RID_CODE (qualifier) == RID_CONST)
4601 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4603 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4613 error ("invalid type modifier within pointer declarator");
4614 if (constp > 1 && ! flag_isoc99)
4615 pedwarn ("duplicate `const'");
4616 if (volatilep > 1 && ! flag_isoc99)
4617 pedwarn ("duplicate `volatile'");
4618 if (restrictp > 1 && ! flag_isoc99)
4619 pedwarn ("duplicate `restrict'");
4621 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4622 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4623 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4626 declarator = TREE_OPERAND (declarator, 0);
4633 /* Now TYPE has the actual type. */
4635 /* Did array size calculations overflow? */
4637 if (TREE_CODE (type) == ARRAY_TYPE
4638 && COMPLETE_TYPE_P (type)
4639 && TREE_OVERFLOW (TYPE_SIZE (type)))
4641 error ("size of array `%s' is too large", name);
4642 /* If we proceed with the array type as it is, we'll eventully
4643 crash in tree_low_cst(). */
4644 type = error_mark_node;
4647 /* If this is declaring a typedef name, return a TYPE_DECL. */
4649 if (specbits & (1 << (int) RID_TYPEDEF))
4652 /* Note that the grammar rejects storage classes
4653 in typenames, fields or parameters */
4654 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4656 pedwarn ("ISO C forbids qualified function types");
4658 type = c_build_qualified_type (type, type_quals);
4659 decl = build_decl (TYPE_DECL, declarator, type);
4660 if ((specbits & (1 << (int) RID_SIGNED))
4661 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4662 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4666 /* Detect the case of an array type of unspecified size
4667 which came, as such, direct from a typedef name.
4668 We must copy the type, so that each identifier gets
4669 a distinct type, so that each identifier's size can be
4670 controlled separately by its own initializer. */
4672 if (type != 0 && typedef_type != 0
4673 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4674 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4676 type = build_array_type (TREE_TYPE (type), 0);
4678 C_TYPE_VARIABLE_SIZE (type) = 1;
4681 /* If this is a type name (such as, in a cast or sizeof),
4682 compute the type and return it now. */
4684 if (decl_context == TYPENAME)
4686 /* Note that the grammar rejects storage classes
4687 in typenames, fields or parameters */
4688 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4690 pedwarn ("ISO C forbids const or volatile function types");
4692 type = c_build_qualified_type (type, type_quals);
4696 /* Aside from typedefs and type names (handle above),
4697 `void' at top level (not within pointer)
4698 is allowed only in public variables.
4699 We don't complain about parms either, but that is because
4700 a better error message can be made later. */
4702 if (VOID_TYPE_P (type) && decl_context != PARM
4703 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4704 && ((specbits & (1 << (int) RID_EXTERN))
4705 || (current_binding_level == global_binding_level
4707 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4709 error ("variable or field `%s' declared void", name);
4710 type = integer_type_node;
4713 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4714 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4719 if (decl_context == PARM)
4721 tree type_as_written;
4724 /* A parameter declared as an array of T is really a pointer to T.
4725 One declared as a function is really a pointer to a function. */
4727 if (TREE_CODE (type) == ARRAY_TYPE)
4729 /* Transfer const-ness of array into that of type pointed to. */
4730 type = TREE_TYPE (type);
4732 type = c_build_qualified_type (type, type_quals);
4733 type = build_pointer_type (type);
4734 type_quals = TYPE_UNQUALIFIED;
4735 if (array_ptr_quals)
4737 tree new_ptr_quals, new_ptr_attrs;
4739 split_specs_attrs (array_ptr_quals, &new_ptr_quals, &new_ptr_attrs);
4740 /* We don't yet implement attributes in this context. */
4741 if (new_ptr_attrs != NULL_TREE)
4742 warning ("attributes in parameter array declarator ignored");
4747 for (; new_ptr_quals; new_ptr_quals = TREE_CHAIN (new_ptr_quals))
4749 tree qualifier = TREE_VALUE (new_ptr_quals);
4751 if (C_IS_RESERVED_WORD (qualifier))
4753 if (C_RID_CODE (qualifier) == RID_CONST)
4755 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4757 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4767 error ("invalid type modifier within array declarator");
4769 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4770 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4771 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4775 else if (TREE_CODE (type) == FUNCTION_TYPE)
4777 if (pedantic && type_quals)
4778 pedwarn ("ISO C forbids qualified function types");
4780 type = c_build_qualified_type (type, type_quals);
4781 type = build_pointer_type (type);
4782 type_quals = TYPE_UNQUALIFIED;
4784 else if (type_quals)
4785 type = c_build_qualified_type (type, type_quals);
4787 type_as_written = type;
4789 decl = build_decl (PARM_DECL, declarator, type);
4791 C_DECL_VARIABLE_SIZE (decl) = 1;
4793 /* Compute the type actually passed in the parmlist,
4794 for the case where there is no prototype.
4795 (For example, shorts and chars are passed as ints.)
4796 When there is a prototype, this is overridden later. */
4798 if (type == error_mark_node)
4799 promoted_type = type;
4802 promoted_type = simple_type_promotes_to (type);
4803 if (! promoted_type)
4804 promoted_type = type;
4807 DECL_ARG_TYPE (decl) = promoted_type;
4808 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4810 else if (decl_context == FIELD)
4812 /* Structure field. It may not be a function. */
4814 if (TREE_CODE (type) == FUNCTION_TYPE)
4816 error ("field `%s' declared as a function", name);
4817 type = build_pointer_type (type);
4819 else if (TREE_CODE (type) != ERROR_MARK
4820 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4822 error ("field `%s' has incomplete type", name);
4823 type = error_mark_node;
4825 /* Move type qualifiers down to element of an array. */
4826 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4828 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4830 TYPE_DOMAIN (type));
4832 /* Leave the field const or volatile as well. */
4833 type_quals = TYPE_UNQUALIFIED;
4836 decl = build_decl (FIELD_DECL, declarator, type);
4837 DECL_NONADDRESSABLE_P (decl) = bitfield;
4840 C_DECL_VARIABLE_SIZE (decl) = 1;
4842 else if (TREE_CODE (type) == FUNCTION_TYPE)
4844 /* Every function declaration is "external"
4845 except for those which are inside a function body
4846 in which `auto' is used.
4847 That is a case not specified by ANSI C,
4848 and we use it for forward declarations for nested functions. */
4849 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4850 || current_binding_level == global_binding_level);
4852 if (specbits & (1 << (int) RID_AUTO)
4853 && (pedantic || current_binding_level == global_binding_level))
4854 pedwarn ("invalid storage class for function `%s'", name);
4855 if (specbits & (1 << (int) RID_REGISTER))
4856 error ("invalid storage class for function `%s'", name);
4857 /* Function declaration not at top level.
4858 Storage classes other than `extern' are not allowed
4859 and `extern' makes no difference. */
4860 if (current_binding_level != global_binding_level
4861 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4863 pedwarn ("invalid storage class for function `%s'", name);
4865 decl = build_decl (FUNCTION_DECL, declarator, type);
4866 decl = build_decl_attribute_variant (decl, decl_machine_attr);
4868 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4869 pedwarn ("ISO C forbids qualified function types");
4871 /* GNU C interprets a `volatile void' return type to indicate
4872 that the function does not return. */
4873 if ((type_quals & TYPE_QUAL_VOLATILE)
4874 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4875 warning ("`noreturn' function returns non-void value");
4878 DECL_EXTERNAL (decl) = 1;
4879 /* Record absence of global scope for `static' or `auto'. */
4881 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4883 /* Record presence of `inline', if it is reasonable. */
4886 if (MAIN_NAME_P (declarator))
4887 warning ("cannot inline function `main'");
4889 /* Assume that otherwise the function can be inlined. */
4890 DECL_INLINE (decl) = 1;
4892 if (specbits & (1 << (int) RID_EXTERN))
4893 current_extern_inline = 1;
4898 /* It's a variable. */
4899 /* An uninitialized decl with `extern' is a reference. */
4900 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4902 /* Move type qualifiers down to element of an array. */
4903 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4905 int saved_align = TYPE_ALIGN(type);
4906 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4908 TYPE_DOMAIN (type));
4909 TYPE_ALIGN (type) = saved_align;
4910 #if 0 /* Leave the variable const or volatile as well. */
4911 type_quals = TYPE_UNQUALIFIED;
4914 else if (type_quals)
4915 type = c_build_qualified_type (type, type_quals);
4917 decl = build_decl (VAR_DECL, declarator, type);
4919 C_DECL_VARIABLE_SIZE (decl) = 1;
4922 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4924 DECL_EXTERNAL (decl) = extern_ref;
4925 /* At top level, the presence of a `static' or `register' storage
4926 class specifier, or the absence of all storage class specifiers
4927 makes this declaration a definition (perhaps tentative). Also,
4928 the absence of both `static' and `register' makes it public. */
4929 if (current_binding_level == global_binding_level)
4933 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
4934 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
4936 /* Not at top level, only `static' makes a static definition. */
4939 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4940 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
4944 /* Record `register' declaration for warnings on &
4945 and in case doing stupid register allocation. */
4947 if (specbits & (1 << (int) RID_REGISTER))
4948 DECL_REGISTER (decl) = 1;
4950 /* Record constancy and volatility. */
4951 c_apply_type_quals_to_decl (type_quals, decl);
4953 /* If a type has volatile components, it should be stored in memory.
4954 Otherwise, the fact that those components are volatile
4955 will be ignored, and would even crash the compiler. */
4956 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4957 mark_addressable (decl);
4963 /* Decode the parameter-list info for a function type or function definition.
4964 The argument is the value returned by `get_parm_info' (or made in parse.y
4965 if there is an identifier list instead of a parameter decl list).
4966 These two functions are separate because when a function returns
4967 or receives functions then each is called multiple times but the order
4968 of calls is different. The last call to `grokparms' is always the one
4969 that contains the formal parameter names of a function definition.
4971 Store in `last_function_parms' a chain of the decls of parms.
4972 Also store in `last_function_parm_tags' a chain of the struct, union,
4973 and enum tags declared among the parms.
4975 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4977 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4978 a mere declaration. A nonempty identifier-list gets an error message
4979 when FUNCDEF_FLAG is zero. */
4982 grokparms (parms_info, funcdef_flag)
4986 tree first_parm = TREE_CHAIN (parms_info);
4988 last_function_parms = TREE_PURPOSE (parms_info);
4989 last_function_parm_tags = TREE_VALUE (parms_info);
4991 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
4992 && !in_system_header)
4993 warning ("function declaration isn't a prototype");
4996 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
4999 pedwarn ("parameter names (without types) in function declaration");
5001 last_function_parms = first_parm;
5008 /* We no longer test FUNCDEF_FLAG.
5009 If the arg types are incomplete in a declaration,
5010 they must include undefined tags.
5011 These tags can never be defined in the scope of the declaration,
5012 so the types can never be completed,
5013 and no call can be compiled successfully. */
5015 /* In a fcn definition, arg types must be complete. */
5018 for (parm = last_function_parms, typelt = first_parm;
5020 parm = TREE_CHAIN (parm))
5021 /* Skip over any enumeration constants declared here. */
5022 if (TREE_CODE (parm) == PARM_DECL)
5024 /* Barf if the parameter itself has an incomplete type. */
5025 tree type = TREE_VALUE (typelt);
5026 if (type == error_mark_node)
5028 if (!COMPLETE_TYPE_P (type))
5030 if (funcdef_flag && DECL_NAME (parm) != 0)
5031 error ("parameter `%s' has incomplete type",
5032 IDENTIFIER_POINTER (DECL_NAME (parm)));
5034 warning ("parameter has incomplete type");
5037 TREE_VALUE (typelt) = error_mark_node;
5038 TREE_TYPE (parm) = error_mark_node;
5042 /* This has been replaced by parm_tags_warning, which
5043 uses a more accurate criterion for what to warn
5047 /* Now warn if is a pointer to an incomplete type. */
5048 while (TREE_CODE (type) == POINTER_TYPE
5049 || TREE_CODE (type) == REFERENCE_TYPE)
5050 type = TREE_TYPE (type);
5051 type = TYPE_MAIN_VARIANT (type);
5052 if (!COMPLETE_TYPE_P (type))
5054 if (DECL_NAME (parm) != 0)
5055 warning ("parameter `%s' points to incomplete type",
5056 IDENTIFIER_POINTER (DECL_NAME (parm)));
5058 warning ("parameter points to incomplete type");
5062 typelt = TREE_CHAIN (typelt);
5069 /* Return a tree_list node with info on a parameter list just parsed.
5070 The TREE_PURPOSE is a chain of decls of those parms.
5071 The TREE_VALUE is a list of structure, union and enum tags defined.
5072 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5073 This tree_list node is later fed to `grokparms'.
5075 VOID_AT_END nonzero means append `void' to the end of the type-list.
5076 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5079 get_parm_info (void_at_end)
5082 register tree decl, t;
5083 register tree types = 0;
5085 tree tags = gettags ();
5086 tree parms = getdecls ();
5088 tree order = current_binding_level->parm_order;
5090 /* Just `void' (and no ellipsis) is special. There are really no parms.
5091 But if the `void' is qualified (by `const' or `volatile') or has a
5092 storage class specifier (`register'), then the behavior is undefined;
5093 by not counting it as the special case of `void' we will cause an
5094 error later. Typedefs for `void' are OK (see DR#157). */
5095 if (void_at_end && parms != 0
5096 && TREE_CHAIN (parms) == 0
5097 && VOID_TYPE_P (TREE_TYPE (parms))
5098 && ! TREE_THIS_VOLATILE (parms)
5099 && ! TREE_READONLY (parms)
5100 && ! DECL_REGISTER (parms)
5101 && DECL_NAME (parms) == 0)
5104 storedecls (NULL_TREE);
5105 return tree_cons (NULL_TREE, NULL_TREE,
5106 tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5109 /* Extract enumerator values and other non-parms declared with the parms.
5110 Likewise any forward parm decls that didn't have real parm decls. */
5111 for (decl = parms; decl;)
5113 tree next = TREE_CHAIN (decl);
5115 if (TREE_CODE (decl) != PARM_DECL)
5117 TREE_CHAIN (decl) = new_parms;
5120 else if (TREE_ASM_WRITTEN (decl))
5122 error_with_decl (decl,
5123 "parameter `%s' has just a forward declaration");
5124 TREE_CHAIN (decl) = new_parms;
5130 /* Put the parm decls back in the order they were in in the parm list. */
5131 for (t = order; t; t = TREE_CHAIN (t))
5134 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5136 TREE_CHAIN (TREE_VALUE (t)) = 0;
5139 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5142 /* Store the parmlist in the binding level since the old one
5143 is no longer a valid list. (We have changed the chain pointers.) */
5144 storedecls (new_parms);
5146 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5147 /* There may also be declarations for enumerators if an enumeration
5148 type is declared among the parms. Ignore them here. */
5149 if (TREE_CODE (decl) == PARM_DECL)
5151 /* Since there is a prototype,
5152 args are passed in their declared types. */
5153 tree type = TREE_TYPE (decl);
5154 DECL_ARG_TYPE (decl) = type;
5155 if (PROMOTE_PROTOTYPES
5156 && INTEGRAL_TYPE_P (type)
5157 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5158 DECL_ARG_TYPE (decl) = integer_type_node;
5160 types = tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5161 if (VOID_TYPE_P (TREE_VALUE (types)) && ! erred
5162 && DECL_NAME (decl) == 0)
5164 error ("`void' in parameter list must be the entire list");
5170 return tree_cons (new_parms, tags,
5171 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
5173 return tree_cons (new_parms, tags, nreverse (types));
5176 /* At end of parameter list, warn about any struct, union or enum tags
5177 defined within. Do so because these types cannot ever become complete. */
5180 parmlist_tags_warning ()
5185 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5187 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5188 /* An anonymous union parm type is meaningful as a GNU extension.
5189 So don't warn for that. */
5190 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5192 if (TREE_PURPOSE (elt) != 0)
5193 warning ("`%s %s' declared inside parameter list",
5194 (code == RECORD_TYPE ? "struct"
5195 : code == UNION_TYPE ? "union"
5197 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5200 /* For translation these need to be seperate warnings */
5201 if (code == RECORD_TYPE)
5202 warning ("anonymous struct declared inside parameter list");
5203 else if (code == UNION_TYPE)
5204 warning ("anonymous union declared inside parameter list");
5206 warning ("anonymous enum declared inside parameter list");
5210 warning ("its scope is only this definition or declaration, which is probably not what you want.");
5216 /* Get the struct, enum or union (CODE says which) with tag NAME.
5217 Define the tag as a forward-reference if it is not defined. */
5220 xref_tag (code, name)
5221 enum tree_code code;
5224 /* If a cross reference is requested, look up the type
5225 already defined for this tag and return it. */
5227 register tree ref = lookup_tag (code, name, current_binding_level, 0);
5228 /* If this is the right type of tag, return what we found.
5229 (This reference will be shadowed by shadow_tag later if appropriate.)
5230 If this is the wrong type of tag, do not return it. If it was the
5231 wrong type in the same binding level, we will have had an error
5232 message already; if in a different binding level and declaring
5233 a name, pending_xref_error will give an error message; but if in a
5234 different binding level and not declaring a name, this tag should
5235 shadow the previous declaration of a different type of tag, and
5236 this would not work properly if we return the reference found.
5237 (For example, with "struct foo" in an outer scope, "union foo;"
5238 must shadow that tag with a new one of union type.) */
5239 if (ref && TREE_CODE (ref) == code)
5242 /* If no such tag is yet defined, create a forward-reference node
5243 and record it as the "definition".
5244 When a real declaration of this type is found,
5245 the forward-reference will be altered into a real type. */
5247 ref = make_node (code);
5248 if (code == ENUMERAL_TYPE)
5250 /* Give the type a default layout like unsigned int
5251 to avoid crashing if it does not get defined. */
5252 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5253 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5254 TYPE_USER_ALIGN (ref) = 0;
5255 TREE_UNSIGNED (ref) = 1;
5256 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5257 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5258 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5261 pushtag (name, ref);
5266 /* Make sure that the tag NAME is defined *in the current binding level*
5267 at least as a forward reference.
5268 CODE says which kind of tag NAME ought to be. */
5271 start_struct (code, name)
5272 enum tree_code code;
5275 /* If there is already a tag defined at this binding level
5276 (as a forward reference), just return it. */
5278 register tree ref = 0;
5281 ref = lookup_tag (code, name, current_binding_level, 1);
5282 if (ref && TREE_CODE (ref) == code)
5284 C_TYPE_BEING_DEFINED (ref) = 1;
5285 TYPE_PACKED (ref) = flag_pack_struct;
5286 if (TYPE_FIELDS (ref))
5287 error ("redefinition of `%s %s'",
5288 code == UNION_TYPE ? "union" : "struct",
5289 IDENTIFIER_POINTER (name));
5294 /* Otherwise create a forward-reference just so the tag is in scope. */
5296 ref = make_node (code);
5297 pushtag (name, ref);
5298 C_TYPE_BEING_DEFINED (ref) = 1;
5299 TYPE_PACKED (ref) = flag_pack_struct;
5303 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5304 of a structure component, returning a FIELD_DECL node.
5305 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5307 This is done during the parsing of the struct declaration.
5308 The FIELD_DECL nodes are chained together and the lot of them
5309 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5312 grokfield (filename, line, declarator, declspecs, width)
5313 const char *filename ATTRIBUTE_UNUSED;
5314 int line ATTRIBUTE_UNUSED;
5315 tree declarator, declspecs, width;
5319 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5321 finish_decl (value, NULL_TREE, NULL_TREE);
5322 DECL_INITIAL (value) = width;
5324 maybe_objc_check_decl (value);
5328 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5329 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5330 ATTRIBUTES are attributes to be applied to the structure. */
5333 finish_struct (t, fieldlist, attributes)
5339 int toplevel = global_binding_level == current_binding_level;
5340 int saw_named_field;
5342 /* If this type was previously laid out as a forward reference,
5343 make sure we lay it out again. */
5347 decl_attributes (t, attributes);
5349 /* Nameless union parm types are useful as GCC extension. */
5350 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5351 /* Otherwise, warn about any struct or union def. in parmlist. */
5352 if (in_parm_level_p ())
5355 pedwarn ("%s defined inside parms",
5356 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5357 else if (! flag_traditional)
5358 warning ("%s defined inside parms",
5359 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5364 for (x = fieldlist; x; x = TREE_CHAIN (x))
5365 if (DECL_NAME (x) != 0)
5369 pedwarn ("%s has no %s",
5370 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
5371 fieldlist ? _("named members") : _("members"));
5374 /* Install struct as DECL_CONTEXT of each field decl.
5375 Also process specified field sizes,m which is found in the DECL_INITIAL.
5376 Store 0 there, except for ": 0" fields (so we can find them
5377 and delete them, below). */
5379 saw_named_field = 0;
5380 for (x = fieldlist; x; x = TREE_CHAIN (x))
5382 DECL_CONTEXT (x) = t;
5383 DECL_PACKED (x) |= TYPE_PACKED (t);
5385 /* If any field is const, the structure type is pseudo-const. */
5386 if (TREE_READONLY (x))
5387 C_TYPE_FIELDS_READONLY (t) = 1;
5390 /* A field that is pseudo-const makes the structure likewise. */
5391 tree t1 = TREE_TYPE (x);
5392 while (TREE_CODE (t1) == ARRAY_TYPE)
5393 t1 = TREE_TYPE (t1);
5394 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5395 && C_TYPE_FIELDS_READONLY (t1))
5396 C_TYPE_FIELDS_READONLY (t) = 1;
5399 /* Any field that is volatile means variables of this type must be
5400 treated in some ways as volatile. */
5401 if (TREE_THIS_VOLATILE (x))
5402 C_TYPE_FIELDS_VOLATILE (t) = 1;
5404 /* Any field of nominal variable size implies structure is too. */
5405 if (C_DECL_VARIABLE_SIZE (x))
5406 C_TYPE_VARIABLE_SIZE (t) = 1;
5408 /* Detect invalid nested redefinition. */
5409 if (TREE_TYPE (x) == t)
5410 error ("nested redefinition of `%s'",
5411 IDENTIFIER_POINTER (TYPE_NAME (t)));
5413 /* Detect invalid bit-field size. */
5414 if (DECL_INITIAL (x))
5415 STRIP_NOPS (DECL_INITIAL (x));
5416 if (DECL_INITIAL (x))
5418 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5419 constant_expression_warning (DECL_INITIAL (x));
5423 "bit-field `%s' width not an integer constant");
5424 DECL_INITIAL (x) = NULL;
5428 /* Detect invalid bit-field type. */
5429 if (DECL_INITIAL (x)
5430 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5431 && TREE_CODE (TREE_TYPE (x)) != BOOLEAN_TYPE
5432 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5434 error_with_decl (x, "bit-field `%s' has invalid type");
5435 DECL_INITIAL (x) = NULL;
5438 if (DECL_INITIAL (x) && pedantic
5439 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5440 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5441 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != c_bool_type_node
5442 /* Accept an enum that's equivalent to int or unsigned int. */
5443 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5444 && (TYPE_PRECISION (TREE_TYPE (x))
5445 == TYPE_PRECISION (integer_type_node))))
5446 pedwarn_with_decl (x, "bit-field `%s' type invalid in ISO C");
5448 /* Detect and ignore out of range field width and process valid
5450 if (DECL_INITIAL (x))
5453 if (TYPE_MAIN_VARIANT (TREE_TYPE (x)) == c_bool_type_node)
5454 max_width = CHAR_TYPE_SIZE;
5456 max_width = TYPE_PRECISION (TREE_TYPE (x));
5457 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5458 error_with_decl (x, "negative width in bit-field `%s'");
5459 else if (0 < compare_tree_int (DECL_INITIAL (x), max_width))
5460 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5461 else if (integer_zerop (DECL_INITIAL (x)) && DECL_NAME (x) != 0)
5462 error_with_decl (x, "zero width for bit-field `%s'");
5465 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
5466 unsigned HOST_WIDE_INT width
5467 = TREE_INT_CST_LOW (DECL_INITIAL (x));
5469 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5470 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5471 TREE_UNSIGNED (TREE_TYPE (x)))
5473 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5474 TREE_UNSIGNED (TREE_TYPE (x))))))
5475 warning_with_decl (x,
5476 "`%s' is narrower than values of its type");
5478 DECL_SIZE (x) = bitsize_int (width);
5479 DECL_BIT_FIELD (x) = 1;
5480 SET_DECL_C_BIT_FIELD (x);
5484 /* field size 0 => force desired amount of alignment. */
5485 #ifdef EMPTY_FIELD_BOUNDARY
5486 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5488 #ifdef PCC_BITFIELD_TYPE_MATTERS
5489 if (PCC_BITFIELD_TYPE_MATTERS)
5491 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5492 TYPE_ALIGN (TREE_TYPE (x)));
5493 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5500 else if (TREE_TYPE (x) != error_mark_node)
5502 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5503 : TYPE_ALIGN (TREE_TYPE (x)));
5505 /* Non-bit-fields are aligned for their type, except packed
5506 fields which require only BITS_PER_UNIT alignment. */
5507 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5508 if (! DECL_PACKED (x))
5509 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5512 DECL_INITIAL (x) = 0;
5514 /* Detect flexible array member in an invalid context. */
5515 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5516 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5517 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5518 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5520 if (TREE_CODE (t) == UNION_TYPE)
5521 error_with_decl (x, "flexible array member in union");
5522 else if (TREE_CHAIN (x) != NULL_TREE)
5523 error_with_decl (x, "flexible array member not at end of struct");
5524 else if (! saw_named_field)
5525 error_with_decl (x, "flexible array member in otherwise empty struct");
5528 saw_named_field = 1;
5531 /* Delete all duplicate fields from the fieldlist */
5532 for (x = fieldlist; x && TREE_CHAIN (x);)
5533 /* Anonymous fields aren't duplicates. */
5534 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5538 register tree y = fieldlist;
5542 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5548 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5550 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5551 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5557 /* Now we have the nearly final fieldlist. Record it,
5558 then lay out the structure or union (including the fields). */
5560 TYPE_FIELDS (t) = fieldlist;
5564 /* Delete all zero-width bit-fields from the fieldlist */
5566 tree *fieldlistp = &fieldlist;
5568 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5569 *fieldlistp = TREE_CHAIN (*fieldlistp);
5571 fieldlistp = &TREE_CHAIN (*fieldlistp);
5574 /* Now we have the truly final field list.
5575 Store it in this type and in the variants. */
5577 TYPE_FIELDS (t) = fieldlist;
5579 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5581 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5582 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5583 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5584 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5587 /* If this was supposed to be a transparent union, but we can't
5588 make it one, warn and turn off the flag. */
5589 if (TREE_CODE (t) == UNION_TYPE
5590 && TYPE_TRANSPARENT_UNION (t)
5591 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5593 TYPE_TRANSPARENT_UNION (t) = 0;
5594 warning ("union cannot be made transparent");
5597 /* If this structure or union completes the type of any previous
5598 variable declaration, lay it out and output its rtl. */
5600 if (current_binding_level->n_incomplete != 0)
5603 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5605 if (TYPE_MAIN_VARIANT (TREE_TYPE (decl)) == TYPE_MAIN_VARIANT (t)
5606 && TREE_CODE (decl) != TYPE_DECL)
5608 layout_decl (decl, 0);
5609 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5610 maybe_objc_check_decl (decl);
5611 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5614 --current_binding_level->n_incomplete;
5616 else if (!COMPLETE_TYPE_P (TREE_TYPE (decl))
5617 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5619 tree element = TREE_TYPE (decl);
5620 while (TREE_CODE (element) == ARRAY_TYPE)
5621 element = TREE_TYPE (element);
5623 layout_array_type (TREE_TYPE (decl));
5628 /* Finish debugging output for this type. */
5629 rest_of_type_compilation (t, toplevel);
5634 /* Lay out the type T, and its element type, and so on. */
5637 layout_array_type (t)
5640 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5641 layout_array_type (TREE_TYPE (t));
5645 /* Begin compiling the definition of an enumeration type.
5646 NAME is its name (or null if anonymous).
5647 Returns the type object, as yet incomplete.
5648 Also records info about it so that build_enumerator
5649 may be used to declare the individual values as they are read. */
5655 register tree enumtype = 0;
5657 /* If this is the real definition for a previous forward reference,
5658 fill in the contents in the same object that used to be the
5659 forward reference. */
5662 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5664 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5666 enumtype = make_node (ENUMERAL_TYPE);
5667 pushtag (name, enumtype);
5670 C_TYPE_BEING_DEFINED (enumtype) = 1;
5672 if (TYPE_VALUES (enumtype) != 0)
5674 /* This enum is a named one that has been declared already. */
5675 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5677 /* Completely replace its old definition.
5678 The old enumerators remain defined, however. */
5679 TYPE_VALUES (enumtype) = 0;
5682 enum_next_value = integer_zero_node;
5685 if (flag_short_enums)
5686 TYPE_PACKED (enumtype) = 1;
5691 /* After processing and defining all the values of an enumeration type,
5692 install their decls in the enumeration type and finish it off.
5693 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5694 and ATTRIBUTES are the specified attributes.
5695 Returns ENUMTYPE. */
5698 finish_enum (enumtype, values, attributes)
5703 register tree pair, tem;
5704 tree minnode = 0, maxnode = 0, enum_value_type;
5705 int precision, unsign;
5706 int toplevel = (global_binding_level == current_binding_level);
5708 if (in_parm_level_p ())
5709 warning ("enum defined inside parms");
5711 decl_attributes (enumtype, attributes);
5713 /* Calculate the maximum value of any enumerator in this type. */
5715 if (values == error_mark_node)
5716 minnode = maxnode = integer_zero_node;
5719 minnode = maxnode = TREE_VALUE (values);
5720 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5722 tree value = TREE_VALUE (pair);
5723 if (tree_int_cst_lt (maxnode, value))
5725 if (tree_int_cst_lt (value, minnode))
5730 /* Construct the final type of this enumeration. It is the same
5731 as one of the integral types - the narrowest one that fits, except
5732 that normally we only go as narrow as int - and signed iff any of
5733 the values are negative. */
5734 unsign = (tree_int_cst_sgn (minnode) >= 0);
5735 precision = MAX (min_precision (minnode, unsign),
5736 min_precision (maxnode, unsign));
5737 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5739 tree narrowest = type_for_size (precision, unsign);
5742 warning ("enumeration values exceed range of largest integer");
5743 narrowest = long_long_integer_type_node;
5746 precision = TYPE_PRECISION (narrowest);
5749 precision = TYPE_PRECISION (integer_type_node);
5751 if (precision == TYPE_PRECISION (integer_type_node))
5752 enum_value_type = type_for_size (precision, 0);
5754 enum_value_type = enumtype;
5756 TYPE_MIN_VALUE (enumtype) = minnode;
5757 TYPE_MAX_VALUE (enumtype) = maxnode;
5758 TYPE_PRECISION (enumtype) = precision;
5759 TREE_UNSIGNED (enumtype) = unsign;
5760 TYPE_SIZE (enumtype) = 0;
5761 layout_type (enumtype);
5763 if (values != error_mark_node)
5765 /* Change the type of the enumerators to be the enum type. We
5766 need to do this irrespective of the size of the enum, for
5767 proper type checking. Replace the DECL_INITIALs of the
5768 enumerators, and the value slots of the list, with copies
5769 that have the enum type; they cannot be modified in place
5770 because they may be shared (e.g. integer_zero_node) Finally,
5771 change the purpose slots to point to the names of the decls. */
5772 for (pair = values; pair; pair = TREE_CHAIN (pair))
5774 tree enu = TREE_PURPOSE (pair);
5776 TREE_TYPE (enu) = enumtype;
5777 DECL_SIZE (enu) = TYPE_SIZE (enumtype);
5778 DECL_SIZE_UNIT (enu) = TYPE_SIZE_UNIT (enumtype);
5779 DECL_ALIGN (enu) = TYPE_ALIGN (enumtype);
5780 DECL_USER_ALIGN (enu) = TYPE_USER_ALIGN (enumtype);
5781 DECL_MODE (enu) = TYPE_MODE (enumtype);
5783 /* The ISO C Standard mandates enumerators to have type int,
5784 even though the underlying type of an enum type is
5785 unspecified. Here we convert any enumerators that fit in
5786 an int to type int, to avoid promotions to unsigned types
5787 when comparing integers with enumerators that fit in the
5788 int range. When -pedantic is given, build_enumerator()
5789 would have already taken care of those that don't fit. */
5790 if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
5791 DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
5793 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5795 TREE_PURPOSE (pair) = DECL_NAME (enu);
5796 TREE_VALUE (pair) = DECL_INITIAL (enu);
5799 TYPE_VALUES (enumtype) = values;
5802 /* Fix up all variant types of this enum type. */
5803 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5805 if (tem == enumtype)
5807 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5808 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5809 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5810 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5811 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5812 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5813 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5814 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5815 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5816 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5819 /* Finish debugging output for this type. */
5820 rest_of_type_compilation (enumtype, toplevel);
5825 /* Build and install a CONST_DECL for one value of the
5826 current enumeration type (one that was begun with start_enum).
5827 Return a tree-list containing the CONST_DECL and its value.
5828 Assignment of sequential values by default is handled here. */
5831 build_enumerator (name, value)
5834 register tree decl, type;
5836 /* Validate and default VALUE. */
5838 /* Remove no-op casts from the value. */
5840 STRIP_TYPE_NOPS (value);
5844 if (TREE_CODE (value) == INTEGER_CST)
5846 value = default_conversion (value);
5847 constant_expression_warning (value);
5851 error ("enumerator value for `%s' not integer constant",
5852 IDENTIFIER_POINTER (name));
5857 /* Default based on previous value. */
5858 /* It should no longer be possible to have NON_LVALUE_EXPR
5862 value = enum_next_value;
5864 error ("overflow in enumeration values");
5867 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5869 pedwarn ("ISO C restricts enumerator values to range of `int'");
5870 value = convert (integer_type_node, value);
5873 /* Set basis for default for next value. */
5874 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5875 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5877 /* Now create a declaration for the enum value name. */
5879 type = TREE_TYPE (value);
5880 type = type_for_size (MAX (TYPE_PRECISION (type),
5881 TYPE_PRECISION (integer_type_node)),
5883 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
5884 && TREE_UNSIGNED (type)));
5886 decl = build_decl (CONST_DECL, name, type);
5887 DECL_INITIAL (decl) = convert (type, value);
5890 return tree_cons (decl, value, NULL_TREE);
5894 /* Create the FUNCTION_DECL for a function definition.
5895 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5896 the declaration; they describe the function's name and the type it returns,
5897 but twisted together in a fashion that parallels the syntax of C.
5899 This function creates a binding context for the function body
5900 as well as setting up the FUNCTION_DECL in current_function_decl.
5902 Returns 1 on success. If the DECLARATOR is not suitable for a function
5903 (it defines a datum instead), we return 0, which tells
5904 yyparse to report a parse error. */
5907 start_function (declspecs, declarator, attributes)
5908 tree declarator, declspecs, attributes;
5910 tree decl1, old_decl;
5912 int old_immediate_size_expand = immediate_size_expand;
5914 current_function_returns_value = 0; /* Assume, until we see it does. */
5915 current_function_returns_null = 0;
5916 warn_about_return_type = 0;
5917 current_extern_inline = 0;
5918 c_function_varargs = 0;
5920 shadowed_labels = 0;
5922 /* Don't expand any sizes in the return type of the function. */
5923 immediate_size_expand = 0;
5925 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
5927 /* If the declarator is not suitable for a function definition,
5928 cause a syntax error. */
5931 immediate_size_expand = old_immediate_size_expand;
5935 decl_attributes (decl1, attributes);
5937 announce_function (decl1);
5939 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5941 error ("return type is an incomplete type");
5942 /* Make it return void instead. */
5944 = build_function_type (void_type_node,
5945 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5948 if (warn_about_return_type)
5949 pedwarn_c99 ("return type defaults to `int'");
5951 /* Save the parm names or decls from this function's declarator
5952 where store_parm_decls will find them. */
5953 current_function_parms = last_function_parms;
5954 current_function_parm_tags = last_function_parm_tags;
5956 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5957 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5958 DECL_INITIAL (decl1) = error_mark_node;
5960 /* If this definition isn't a prototype and we had a prototype declaration
5961 before, copy the arg type info from that prototype.
5962 But not if what we had before was a builtin function. */
5963 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5964 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5965 && !DECL_BUILT_IN (old_decl)
5966 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5967 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5968 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5970 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5971 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
5972 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
5975 /* If there is no explicit declaration, look for any out-of-scope implicit
5978 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
5980 /* Optionally warn of old-fashioned def with no previous prototype. */
5981 if (warn_strict_prototypes
5982 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5984 && (TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0
5985 || (DECL_BUILT_IN (old_decl)
5986 && ! C_DECL_ANTICIPATED (old_decl)))))
5987 warning ("function declaration isn't a prototype");
5988 /* Optionally warn of any global def with no previous prototype. */
5989 else if (warn_missing_prototypes
5990 && TREE_PUBLIC (decl1)
5992 && (TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0
5993 || (DECL_BUILT_IN (old_decl)
5994 && ! C_DECL_ANTICIPATED (old_decl))))
5995 && ! MAIN_NAME_P (DECL_NAME (decl1)))
5996 warning_with_decl (decl1, "no previous prototype for `%s'");
5997 /* Optionally warn of any def with no previous prototype
5998 if the function has already been used. */
5999 else if (warn_missing_prototypes
6000 && old_decl != 0 && TREE_USED (old_decl)
6001 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6002 warning_with_decl (decl1,
6003 "`%s' was used with no prototype before its definition");
6004 /* Optionally warn of any global def with no previous declaration. */
6005 else if (warn_missing_declarations
6006 && TREE_PUBLIC (decl1)
6008 && ! MAIN_NAME_P (DECL_NAME (decl1)))
6009 warning_with_decl (decl1, "no previous declaration for `%s'");
6010 /* Optionally warn of any def with no previous declaration
6011 if the function has already been used. */
6012 else if (warn_missing_declarations
6013 && old_decl != 0 && TREE_USED (old_decl)
6014 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
6015 warning_with_decl (decl1,
6016 "`%s' was used with no declaration before its definition");
6018 /* This is a definition, not a reference.
6019 So normally clear DECL_EXTERNAL.
6020 However, `extern inline' acts like a declaration
6021 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6022 DECL_EXTERNAL (decl1) = current_extern_inline;
6024 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
6025 SET_DEFAULT_DECL_ATTRIBUTES (decl1, attributes);
6028 /* This function exists in static storage.
6029 (This does not mean `static' in the C sense!) */
6030 TREE_STATIC (decl1) = 1;
6032 /* A nested function is not global. */
6033 if (current_function_decl != 0)
6034 TREE_PUBLIC (decl1) = 0;
6036 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6037 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
6042 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6043 != integer_type_node)
6044 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
6046 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
6047 args = TREE_CHAIN (args))
6049 tree type = args ? TREE_VALUE (args) : 0;
6051 if (type == void_type_node)
6058 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6059 pedwarn_with_decl (decl1,
6060 "first argument of `%s' should be `int'");
6064 if (TREE_CODE (type) != POINTER_TYPE
6065 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6066 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6068 pedwarn_with_decl (decl1,
6069 "second argument of `%s' should be `char **'");
6073 if (TREE_CODE (type) != POINTER_TYPE
6074 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6075 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6077 pedwarn_with_decl (decl1,
6078 "third argument of `%s' should probably be `char **'");
6083 /* It is intentional that this message does not mention the third
6084 argument because it's only mentioned in an appendix of the
6086 if (argct > 0 && (argct < 2 || argct > 3))
6087 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
6089 if (! TREE_PUBLIC (decl1))
6090 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
6093 /* Record the decl so that the function name is defined.
6094 If we already have a decl for this name, and it is a FUNCTION_DECL,
6095 use the old decl. */
6097 current_function_decl = pushdecl (decl1);
6100 declare_parm_level (1);
6101 current_binding_level->subblocks_tag_transparent = 1;
6103 make_decl_rtl (current_function_decl, NULL);
6105 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6106 /* Promote the value to int before returning it. */
6107 if (c_promoting_integer_type_p (restype))
6109 /* It retains unsignedness if traditional
6110 or if not really getting wider. */
6111 if (TREE_UNSIGNED (restype)
6112 && (flag_traditional
6113 || (TYPE_PRECISION (restype)
6114 == TYPE_PRECISION (integer_type_node))))
6115 restype = unsigned_type_node;
6117 restype = integer_type_node;
6119 DECL_RESULT (current_function_decl)
6120 = build_decl (RESULT_DECL, NULL_TREE, restype);
6122 /* If this fcn was already referenced via a block-scope `extern' decl
6123 (or an implicit decl), propagate certain information about the usage. */
6124 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6125 TREE_ADDRESSABLE (current_function_decl) = 1;
6127 immediate_size_expand = old_immediate_size_expand;
6129 start_fname_decls ();
6134 /* Record that this function is going to be a varargs function.
6135 This is called before store_parm_decls, which is too early
6136 to call mark_varargs directly. */
6141 c_function_varargs = 1;
6144 /* Store the parameter declarations into the current function declaration.
6145 This is called after parsing the parameter declarations, before
6146 digesting the body of the function.
6148 For an old-style definition, modify the function's type
6149 to specify at least the number of arguments. */
6154 register tree fndecl = current_function_decl;
6157 /* This is either a chain of PARM_DECLs (if a prototype was used)
6158 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6159 tree specparms = current_function_parms;
6161 /* This is a list of types declared among parms in a prototype. */
6162 tree parmtags = current_function_parm_tags;
6164 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6165 register tree parmdecls = getdecls ();
6167 /* This is a chain of any other decls that came in among the parm
6168 declarations. If a parm is declared with enum {foo, bar} x;
6169 then CONST_DECLs for foo and bar are put here. */
6172 /* Nonzero if this definition is written with a prototype. */
6175 /* The function containing FNDECL, if any. */
6176 tree context = decl_function_context (fndecl);
6178 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6180 /* This case is when the function was defined with an ANSI prototype.
6181 The parms already have decls, so we need not do anything here
6182 except record them as in effect
6183 and complain if any redundant old-style parm decls were written. */
6194 error_with_decl (fndecl,
6195 "parm types given both in parmlist and separately");
6196 /* Get rid of the erroneous decls; don't keep them on
6197 the list of parms, since they might not be PARM_DECLs. */
6198 for (decl = current_binding_level->names;
6199 decl; decl = TREE_CHAIN (decl))
6200 if (DECL_NAME (decl))
6201 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6202 for (link = current_binding_level->shadowed;
6203 link; link = TREE_CHAIN (link))
6204 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6205 current_binding_level->names = 0;
6206 current_binding_level->shadowed = 0;
6209 specparms = nreverse (specparms);
6210 for (parm = specparms; parm; parm = next)
6212 next = TREE_CHAIN (parm);
6213 if (TREE_CODE (parm) == PARM_DECL)
6215 if (DECL_NAME (parm) == 0)
6216 error_with_decl (parm, "parameter name omitted");
6217 else if (TREE_CODE (TREE_TYPE (parm)) != ERROR_MARK
6218 && VOID_TYPE_P (TREE_TYPE (parm)))
6220 error_with_decl (parm, "parameter `%s' declared void");
6221 /* Change the type to error_mark_node so this parameter
6222 will be ignored by assign_parms. */
6223 TREE_TYPE (parm) = error_mark_node;
6229 /* If we find an enum constant or a type tag,
6230 put it aside for the moment. */
6231 TREE_CHAIN (parm) = 0;
6232 others = chainon (others, parm);
6236 /* Get the decls in their original chain order
6237 and record in the function. */
6238 DECL_ARGUMENTS (fndecl) = getdecls ();
6241 /* If this function takes a variable number of arguments,
6242 add a phony parameter to the end of the parm list,
6243 to represent the position of the first unnamed argument. */
6244 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6247 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6248 /* Let's hope the address of the unnamed parm
6249 won't depend on its type. */
6250 TREE_TYPE (dummy) = integer_type_node;
6251 DECL_ARG_TYPE (dummy) = integer_type_node;
6252 DECL_ARGUMENTS (fndecl) = chainon (DECL_ARGUMENTS (fndecl), dummy);
6256 /* Now pushdecl the enum constants. */
6257 for (parm = others; parm; parm = next)
6259 next = TREE_CHAIN (parm);
6260 if (DECL_NAME (parm) == 0)
6262 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6264 else if (TREE_CODE (parm) != PARM_DECL)
6268 storetags (chainon (parmtags, gettags ()));
6272 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6273 each with a parm name as the TREE_VALUE.
6275 PARMDECLS is a chain of declarations for parameters.
6276 Warning! It can also contain CONST_DECLs which are not parameters
6277 but are names of enumerators of any enum types
6278 declared among the parameters.
6280 First match each formal parameter name with its declaration.
6281 Associate decls with the names and store the decls
6282 into the TREE_PURPOSE slots. */
6284 /* We use DECL_WEAK as a flag to show which parameters have been
6285 seen already since it is not used on PARM_DECL or CONST_DECL. */
6286 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6287 DECL_WEAK (parm) = 0;
6289 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6291 register tree tail, found = NULL;
6293 if (TREE_VALUE (parm) == 0)
6295 error_with_decl (fndecl,
6296 "parameter name missing from parameter list");
6297 TREE_PURPOSE (parm) = 0;
6301 /* See if any of the parmdecls specifies this parm by name.
6302 Ignore any enumerator decls. */
6303 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6304 if (DECL_NAME (tail) == TREE_VALUE (parm)
6305 && TREE_CODE (tail) == PARM_DECL)
6311 /* If declaration already marked, we have a duplicate name.
6312 Complain, and don't use this decl twice. */
6313 if (found && DECL_WEAK (found))
6315 error_with_decl (found, "multiple parameters named `%s'");
6319 /* If the declaration says "void", complain and ignore it. */
6320 if (found && VOID_TYPE_P (TREE_TYPE (found)))
6322 error_with_decl (found, "parameter `%s' declared void");
6323 TREE_TYPE (found) = integer_type_node;
6324 DECL_ARG_TYPE (found) = integer_type_node;
6325 layout_decl (found, 0);
6328 /* Traditionally, a parm declared float is actually a double. */
6329 if (found && flag_traditional
6330 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6332 TREE_TYPE (found) = double_type_node;
6333 DECL_ARG_TYPE (found) = double_type_node;
6334 layout_decl (found, 0);
6337 /* If no declaration found, default to int. */
6340 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6342 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6343 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6344 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6346 pedwarn_with_decl (found, "type of `%s' defaults to `int'");
6347 else if (extra_warnings)
6348 warning_with_decl (found, "type of `%s' defaults to `int'");
6352 TREE_PURPOSE (parm) = found;
6354 /* Mark this decl as "already found". */
6355 DECL_WEAK (found) = 1;
6358 /* Put anything which is on the parmdecls chain and which is
6359 not a PARM_DECL onto the list NONPARMS. (The types of
6360 non-parm things which might appear on the list include
6361 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6362 any actual PARM_DECLs not matched with any names. */
6365 for (parm = parmdecls; parm;)
6367 tree next = TREE_CHAIN (parm);
6368 TREE_CHAIN (parm) = 0;
6370 if (TREE_CODE (parm) != PARM_DECL)
6371 nonparms = chainon (nonparms, parm);
6374 /* Complain about args with incomplete types. */
6375 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6377 error_with_decl (parm, "parameter `%s' has incomplete type");
6378 TREE_TYPE (parm) = error_mark_node;
6381 if (! DECL_WEAK (parm))
6383 error_with_decl (parm,
6384 "declaration for parameter `%s' but no such parameter");
6385 /* Pretend the parameter was not missing.
6386 This gets us to a standard state and minimizes
6387 further error messages. */
6389 = chainon (specparms,
6390 tree_cons (parm, NULL_TREE, NULL_TREE));
6397 /* Chain the declarations together in the order of the list of
6398 names. Store that chain in the function decl, replacing the
6401 DECL_ARGUMENTS (fndecl) = 0;
6404 for (last = 0; parm; parm = TREE_CHAIN (parm))
6405 if (TREE_PURPOSE (parm))
6408 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6410 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6411 last = TREE_PURPOSE (parm);
6412 TREE_CHAIN (last) = 0;
6416 /* If there was a previous prototype,
6417 set the DECL_ARG_TYPE of each argument according to
6418 the type previously specified, and report any mismatches. */
6420 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6423 for (parm = DECL_ARGUMENTS (fndecl),
6424 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6425 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6426 != void_type_node));
6427 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6429 if (parm == 0 || type == 0
6430 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6432 error ("number of arguments doesn't match prototype");
6433 error_with_file_and_line (current_function_prototype_file,
6434 current_function_prototype_line,
6435 "prototype declaration");
6438 /* Type for passing arg must be consistent with that
6439 declared for the arg. ISO C says we take the unqualified
6440 type for parameters declared with qualified type. */
6441 if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6442 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
6444 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6445 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6447 /* Adjust argument to match prototype. E.g. a previous
6448 `int foo(float);' prototype causes
6449 `int foo(x) float x; {...}' to be treated like
6450 `int foo(float x) {...}'. This is particularly
6451 useful for argument types like uid_t. */
6452 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6454 if (PROMOTE_PROTOTYPES
6455 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6456 && TYPE_PRECISION (TREE_TYPE (parm))
6457 < TYPE_PRECISION (integer_type_node))
6458 DECL_ARG_TYPE (parm) = integer_type_node;
6462 pedwarn ("promoted argument `%s' doesn't match prototype",
6463 IDENTIFIER_POINTER (DECL_NAME (parm)));
6464 warning_with_file_and_line
6465 (current_function_prototype_file,
6466 current_function_prototype_line,
6467 "prototype declaration");
6470 /* If -traditional, allow `int' argument to match
6471 `unsigned' prototype. */
6472 else if (! (flag_traditional
6473 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6474 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6476 error ("argument `%s' doesn't match prototype",
6477 IDENTIFIER_POINTER (DECL_NAME (parm)));
6478 error_with_file_and_line (current_function_prototype_file,
6479 current_function_prototype_line,
6480 "prototype declaration");
6484 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6487 /* Otherwise, create a prototype that would match. */
6491 tree actual = 0, last = 0, type;
6493 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6495 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6497 TREE_CHAIN (last) = type;
6502 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6504 TREE_CHAIN (last) = type;
6508 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6509 of the type of this function, but we need to avoid having this
6510 affect the types of other similarly-typed functions, so we must
6511 first force the generation of an identical (but separate) type
6512 node for the relevant function type. The new node we create
6513 will be a variant of the main variant of the original function
6516 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6518 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6521 /* Now store the final chain of decls for the arguments
6522 as the decl-chain of the current lexical scope.
6523 Put the enumerators in as well, at the front so that
6524 DECL_ARGUMENTS is not modified. */
6526 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6529 /* Make sure the binding level for the top of the function body
6530 gets a BLOCK if there are any in the function.
6531 Otherwise, the dbx output is wrong. */
6533 keep_next_if_subblocks = 1;
6535 /* ??? This might be an improvement,
6536 but needs to be thought about some more. */
6538 keep_next_level_flag = 1;
6541 /* Write a record describing this function definition to the prototypes
6542 file (if requested). */
6544 gen_aux_info_record (fndecl, 1, 0, prototype);
6546 /* Initialize the RTL code for the function. */
6547 init_function_start (fndecl, input_filename, lineno);
6549 /* Begin the statement tree for this function. */
6550 DECL_LANG_SPECIFIC (current_function_decl)
6551 =((struct lang_decl *) ggc_alloc_cleared (sizeof (struct lang_decl)));
6552 begin_stmt_tree (&DECL_SAVED_TREE (current_function_decl));
6554 /* If this is a nested function, save away the sizes of any
6555 variable-size types so that we can expand them when generating
6561 DECL_LANG_SPECIFIC (fndecl)->pending_sizes
6562 = nreverse (get_pending_sizes ());
6563 for (t = DECL_LANG_SPECIFIC (fndecl)->pending_sizes;
6566 SAVE_EXPR_CONTEXT (TREE_VALUE (t)) = context;
6569 /* This function is being processed in whole-function mode. */
6570 cfun->x_whole_function_mode_p = 1;
6572 /* Even though we're inside a function body, we still don't want to
6573 call expand_expr to calculate the size of a variable-sized array.
6574 We haven't necessarily assigned RTL to all variables yet, so it's
6575 not safe to try to expand expressions involving them. */
6576 immediate_size_expand = 0;
6577 cfun->x_dont_save_pending_sizes_p = 1;
6580 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6581 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6582 stands for an ellipsis in the identifier list.
6584 PARMLIST is the data returned by get_parm_info for the
6585 parmlist that follows the semicolon.
6587 We return a value of the same sort that get_parm_info returns,
6588 except that it describes the combination of identifiers and parmlist. */
6591 combine_parm_decls (specparms, parmlist, void_at_end)
6592 tree specparms, parmlist;
6595 register tree fndecl = current_function_decl;
6598 tree parmdecls = TREE_PURPOSE (parmlist);
6600 /* This is a chain of any other decls that came in among the parm
6601 declarations. They were separated already by get_parm_info,
6602 so we just need to keep them separate. */
6603 tree nonparms = TREE_VALUE (parmlist);
6607 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6608 DECL_WEAK (parm) = 0;
6610 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6612 register tree tail, found = NULL;
6614 /* See if any of the parmdecls specifies this parm by name. */
6615 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6616 if (DECL_NAME (tail) == TREE_VALUE (parm))
6622 /* If declaration already marked, we have a duplicate name.
6623 Complain, and don't use this decl twice. */
6624 if (found && DECL_WEAK (found))
6626 error_with_decl (found, "multiple parameters named `%s'");
6630 /* If the declaration says "void", complain and ignore it. */
6631 if (found && VOID_TYPE_P (TREE_TYPE (found)))
6633 error_with_decl (found, "parameter `%s' declared void");
6634 TREE_TYPE (found) = integer_type_node;
6635 DECL_ARG_TYPE (found) = integer_type_node;
6636 layout_decl (found, 0);
6639 /* Traditionally, a parm declared float is actually a double. */
6640 if (found && flag_traditional
6641 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6643 TREE_TYPE (found) = double_type_node;
6644 DECL_ARG_TYPE (found) = double_type_node;
6645 layout_decl (found, 0);
6648 /* If no declaration found, default to int. */
6651 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6653 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6654 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6655 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6656 error_with_decl (found, "type of parameter `%s' is not declared");
6660 TREE_PURPOSE (parm) = found;
6662 /* Mark this decl as "already found". */
6663 DECL_WEAK (found) = 1;
6666 /* Complain about any actual PARM_DECLs not matched with any names. */
6668 for (parm = parmdecls; parm;)
6670 tree next = TREE_CHAIN (parm);
6671 TREE_CHAIN (parm) = 0;
6673 /* Complain about args with incomplete types. */
6674 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6676 error_with_decl (parm, "parameter `%s' has incomplete type");
6677 TREE_TYPE (parm) = error_mark_node;
6680 if (! DECL_WEAK (parm))
6682 error_with_decl (parm,
6683 "declaration for parameter `%s' but no such parameter");
6684 /* Pretend the parameter was not missing.
6685 This gets us to a standard state and minimizes
6686 further error messages. */
6688 = chainon (specparms,
6689 tree_cons (parm, NULL_TREE, NULL_TREE));
6695 /* Chain the declarations together in the order of the list of names.
6696 At the same time, build up a list of their types, in reverse order. */
6702 for (last = 0; parm; parm = TREE_CHAIN (parm))
6703 if (TREE_PURPOSE (parm))
6706 parmdecls = TREE_PURPOSE (parm);
6708 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6709 last = TREE_PURPOSE (parm);
6710 TREE_CHAIN (last) = 0;
6712 types = tree_cons (NULL_TREE, TREE_TYPE (parm), types);
6717 return tree_cons (parmdecls, nonparms,
6718 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
6720 return tree_cons (parmdecls, nonparms, nreverse (types));
6723 /* Finish up a function declaration and compile that function
6724 all the way to assembler language output. The free the storage
6725 for the function definition.
6727 This is called after parsing the body of the function definition.
6729 NESTED is nonzero if the function being finished is nested in another. */
6732 finish_function (nested)
6735 register tree fndecl = current_function_decl;
6737 /* TREE_READONLY (fndecl) = 1;
6738 This caused &foo to be of type ptr-to-const-function
6739 which then got a warning when stored in a ptr-to-function variable. */
6742 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6744 /* Must mark the RESULT_DECL as being in this function. */
6746 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6748 /* Obey `register' declarations if `setjmp' is called in this fn. */
6749 if (flag_traditional && current_function_calls_setjmp)
6751 setjmp_protect (DECL_INITIAL (fndecl));
6752 setjmp_protect_args ();
6755 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6757 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6758 != integer_type_node)
6760 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6761 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6763 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
6767 #ifdef DEFAULT_MAIN_RETURN
6768 /* Make it so that `main' always returns success by default. */
6769 DEFAULT_MAIN_RETURN;
6772 c_expand_return (integer_zero_node);
6777 finish_fname_decls ();
6779 /* Tie off the statement tree for this function. */
6780 finish_stmt_tree (&DECL_SAVED_TREE (fndecl));
6781 /* Clear out memory we no longer need. */
6782 free_after_parsing (cfun);
6783 /* Since we never call rest_of_compilation, we never clear
6784 CFUN. Do so explicitly. */
6785 free_after_compilation (cfun);
6790 /* Generate RTL for the body of this function. */
6791 c_expand_body (fndecl, nested);
6792 /* Let the error reporting routines know that we're outside a
6793 function. For a nested function, this value is used in
6794 pop_c_function_context and then reset via pop_function_context. */
6795 current_function_decl = NULL;
6799 /* Generate the RTL for the body of FNDECL. If NESTED_P is non-zero,
6800 then we are already in the process of generating RTL for another
6804 c_expand_body (fndecl, nested_p)
6808 /* There's no reason to do any of the work here if we're only doing
6809 semantic analysis; this code just generates RTL. */
6810 if (flag_syntax_only)
6815 /* Make sure that we will evaluate variable-sized types involved
6816 in our function's type. */
6817 expand_pending_sizes (DECL_LANG_SPECIFIC (fndecl)->pending_sizes);
6818 /* Squirrel away our current state. */
6819 push_function_context ();
6822 /* Initialize the RTL code for the function. */
6823 current_function_decl = fndecl;
6824 init_function_start (fndecl, input_filename, DECL_SOURCE_LINE (fndecl));
6826 /* This function is being processed in whole-function mode. */
6827 cfun->x_whole_function_mode_p = 1;
6829 /* Even though we're inside a function body, we still don't want to
6830 call expand_expr to calculate the size of a variable-sized array.
6831 We haven't necessarily assigned RTL to all variables yet, so it's
6832 not safe to try to expand expressions involving them. */
6833 immediate_size_expand = 0;
6834 cfun->x_dont_save_pending_sizes_p = 1;
6836 /* If this is a varargs function, inform function.c. */
6837 if (c_function_varargs)
6840 /* Set up parameters and prepare for return, for the function. */
6841 expand_function_start (fndecl, 0);
6843 /* If this function is `main', emit a call to `__main'
6844 to run global initializers, etc. */
6845 if (DECL_NAME (fndecl)
6846 && MAIN_NAME_P (DECL_NAME (fndecl))
6847 && DECL_CONTEXT (fndecl) == NULL_TREE)
6848 expand_main_function ();
6850 /* Generate the RTL for this function. */
6851 expand_stmt (DECL_SAVED_TREE (fndecl));
6852 /* Allow the body of the function to be garbage collected. */
6853 DECL_SAVED_TREE (fndecl) = NULL_TREE;
6855 /* We hard-wired immediate_size_expand to zero above.
6856 expand_function_end will decrement this variable. So, we set the
6857 variable to one here, so that after the decrement it will remain
6859 immediate_size_expand = 1;
6861 /* Allow language dialects to perform special processing. */
6862 if (lang_expand_function_end)
6863 (*lang_expand_function_end) ();
6865 /* Generate rtl for function exit. */
6866 expand_function_end (input_filename, lineno, 0);
6868 /* If this is a nested function, protect the local variables in the stack
6869 above us from being collected while we're compiling this function. */
6871 ggc_push_context ();
6873 /* Run the optimizers and output the assembler code for this function. */
6874 rest_of_compilation (fndecl);
6876 /* Undo the GC context switch. */
6880 /* With just -W, complain only if function returns both with
6881 and without a value. */
6883 && current_function_returns_value
6884 && current_function_returns_null)
6885 warning ("this function may return with or without a value");
6887 /* If requested, warn about function definitions where the function will
6888 return a value (usually of some struct or union type) which itself will
6889 take up a lot of stack space. */
6891 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6893 tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6895 if (ret_type && TYPE_SIZE_UNIT (ret_type)
6896 && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST
6897 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type),
6900 unsigned int size_as_int
6901 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type));
6903 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0)
6904 warning_with_decl (fndecl,
6905 "size of return value of `%s' is %u bytes",
6908 warning_with_decl (fndecl,
6909 "size of return value of `%s' is larger than %d bytes",
6914 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested_p)
6916 /* Stop pointing to the local nodes about to be freed.
6917 But DECL_INITIAL must remain nonzero so we know this
6918 was an actual function definition.
6919 For a nested function, this is done in pop_c_function_context.
6920 If rest_of_compilation set this to 0, leave it 0. */
6921 if (DECL_INITIAL (fndecl) != 0)
6922 DECL_INITIAL (fndecl) = error_mark_node;
6924 DECL_ARGUMENTS (fndecl) = 0;
6927 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6929 #ifndef ASM_OUTPUT_CONSTRUCTOR
6930 if (! flag_gnu_linker)
6931 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6934 assemble_constructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl)));
6937 if (DECL_STATIC_DESTRUCTOR (fndecl))
6939 #ifndef ASM_OUTPUT_DESTRUCTOR
6940 if (! flag_gnu_linker)
6941 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6944 assemble_destructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl)));
6948 /* Return to the enclosing function. */
6949 pop_function_context ();
6952 /* Check the declarations given in a for-loop for satisfying the C99
6955 check_for_loop_decls ()
6961 /* If we get here, declarations have been used in a for loop without
6962 the C99 for loop scope. This doesn't make much sense, so don't
6964 error ("`for' loop initial declaration used outside C99 mode");
6967 /* C99 subclause 6.8.5 paragraph 3:
6969 [#3] The declaration part of a for statement shall only
6970 declare identifiers for objects having storage class auto or
6973 It isn't clear whether, in this sentence, "identifiers" binds to
6974 "shall only declare" or to "objects" - that is, whether all identifiers
6975 declared must be identifiers for objects, or whether the restriction
6976 only applies to those that are. (A question on this in comp.std.c
6977 in November 2000 received no answer.) We implement the strictest
6978 interpretation, to avoid creating an extension which later causes
6981 for (t = gettags (); t; t = TREE_CHAIN (t))
6983 if (TREE_PURPOSE (t) != 0)
6984 error ("`%s %s' declared in `for' loop initial declaration",
6985 (TREE_CODE (TREE_VALUE (t)) == RECORD_TYPE ? "struct"
6986 : TREE_CODE (TREE_VALUE (t)) == UNION_TYPE ? "union"
6988 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6990 for (t = getdecls (); t; t = TREE_CHAIN (t))
6992 if (TREE_CODE (t) != VAR_DECL && DECL_NAME (t))
6993 error_with_decl (t, "declaration of non-variable `%s' in `for' loop initial declaration");
6994 else if (TREE_STATIC (t))
6995 error_with_decl (t, "declaration of static variable `%s' in `for' loop initial declaration");
6996 else if (DECL_EXTERNAL (t))
6997 error_with_decl (t, "declaration of `extern' variable `%s' in `for' loop initial declaration");
7001 /* Save and restore the variables in this file and elsewhere
7002 that keep track of the progress of compilation of the current function.
7003 Used for nested functions. */
7005 struct c_language_function
7007 struct language_function base;
7009 tree shadowed_labels;
7012 int warn_about_return_type;
7014 struct binding_level *binding_level;
7017 /* Save and reinitialize the variables
7018 used during compilation of a C function. */
7021 push_c_function_context (f)
7024 struct c_language_function *p;
7025 p = ((struct c_language_function *)
7026 xmalloc (sizeof (struct c_language_function)));
7027 f->language = (struct language_function *) p;
7029 p->base.x_stmt_tree = c_stmt_tree;
7030 p->base.x_scope_stmt_stack = c_scope_stmt_stack;
7031 p->named_labels = named_labels;
7032 p->shadowed_labels = shadowed_labels;
7033 p->returns_value = current_function_returns_value;
7034 p->returns_null = current_function_returns_null;
7035 p->warn_about_return_type = warn_about_return_type;
7036 p->extern_inline = current_extern_inline;
7037 p->binding_level = current_binding_level;
7040 /* Restore the variables used during compilation of a C function. */
7043 pop_c_function_context (f)
7046 struct c_language_function *p
7047 = (struct c_language_function *) f->language;
7050 /* Bring back all the labels that were shadowed. */
7051 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
7052 if (DECL_NAME (TREE_VALUE (link)) != 0)
7053 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
7054 = TREE_VALUE (link);
7056 if (DECL_SAVED_INSNS (current_function_decl) == 0
7057 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
7059 /* Stop pointing to the local nodes about to be freed. */
7060 /* But DECL_INITIAL must remain nonzero so we know this
7061 was an actual function definition. */
7062 DECL_INITIAL (current_function_decl) = error_mark_node;
7063 DECL_ARGUMENTS (current_function_decl) = 0;
7066 c_stmt_tree = p->base.x_stmt_tree;
7067 c_scope_stmt_stack = p->base.x_scope_stmt_stack;
7068 named_labels = p->named_labels;
7069 shadowed_labels = p->shadowed_labels;
7070 current_function_returns_value = p->returns_value;
7071 current_function_returns_null = p->returns_null;
7072 warn_about_return_type = p->warn_about_return_type;
7073 current_extern_inline = p->extern_inline;
7074 current_binding_level = p->binding_level;
7080 /* Mark the language specific parts of F for GC. */
7083 mark_c_function_context (f)
7086 struct c_language_function *p
7087 = (struct c_language_function *) f->language;
7092 mark_c_language_function (&p->base);
7093 ggc_mark_tree (p->shadowed_labels);
7094 ggc_mark_tree (p->named_labels);
7095 mark_binding_level (&p->binding_level);
7098 /* Copy the DECL_LANG_SEPECIFIC data associated with NODE. */
7101 copy_lang_decl (decl)
7104 struct lang_decl *ld;
7106 if (!DECL_LANG_SPECIFIC (decl))
7109 ld = (struct lang_decl *) ggc_alloc (sizeof (struct lang_decl));
7110 memcpy ((char *) ld, (char *) DECL_LANG_SPECIFIC (decl),
7111 sizeof (struct lang_decl));
7112 DECL_LANG_SPECIFIC (decl) = ld;
7115 /* Mark the language specific bits in T for GC. */
7121 if (TREE_CODE (t) == IDENTIFIER_NODE)
7123 struct lang_identifier *i = (struct lang_identifier *) t;
7124 ggc_mark_tree (i->global_value);
7125 ggc_mark_tree (i->local_value);
7126 ggc_mark_tree (i->label_value);
7127 ggc_mark_tree (i->implicit_decl);
7128 ggc_mark_tree (i->error_locus);
7129 ggc_mark_tree (i->limbo_value);
7131 else if (TYPE_P (t) && TYPE_LANG_SPECIFIC (t))
7132 ggc_mark (TYPE_LANG_SPECIFIC (t));
7133 else if (DECL_P (t) && DECL_LANG_SPECIFIC (t))
7135 ggc_mark (DECL_LANG_SPECIFIC (t));
7136 c_mark_lang_decl (&DECL_LANG_SPECIFIC (t)->base);
7137 ggc_mark_tree (DECL_LANG_SPECIFIC (t)->pending_sizes);
7141 /* The functions below are required for functionality of doing
7142 function at once processing in the C front end. Currently these
7143 functions are not called from anywhere in the C front end, but as
7144 these changes continue, that will change. */
7146 /* Returns non-zero if the current statement is a full expression,
7147 i.e. temporaries created during that statement should be destroyed
7148 at the end of the statement. */
7151 stmts_are_full_exprs_p ()
7156 /* Returns the stmt_tree (if any) to which statements are currently
7157 being added. If there is no active statement-tree, NULL is
7161 current_stmt_tree ()
7163 return &c_stmt_tree;
7166 /* Returns the stack of SCOPE_STMTs for the current function. */
7169 current_scope_stmt_stack ()
7171 return &c_scope_stmt_stack;
7174 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
7178 anon_aggr_type_p (node)
7179 tree node ATTRIBUTE_UNUSED;
7184 /* Dummy function in place of callback used by C++. */
7187 extract_interface_info ()
7191 /* Return a new COMPOUND_STMT, after adding it to the current
7195 c_begin_compound_stmt ()
7199 /* Create the COMPOUND_STMT. */
7200 stmt = add_stmt (build_stmt (COMPOUND_STMT, NULL_TREE));
7205 /* Expand T (a DECL_STMT) if it declares an entity not handled by the
7209 c_expand_decl_stmt (t)
7212 tree decl = DECL_STMT_DECL (t);
7214 /* Expand nested functions. */
7215 if (TREE_CODE (decl) == FUNCTION_DECL
7216 && DECL_CONTEXT (decl) == current_function_decl
7217 && DECL_SAVED_TREE (decl))
7218 c_expand_body (decl, /*nested_p=*/1);
7221 /* Return the IDENTIFIER_GLOBAL_VALUE of T, for use in common code, since
7222 the definition of IDENTIFIER_GLOBAL_VALUE is different for C and C++. */
7225 identifier_global_value (t)
7228 return IDENTIFIER_GLOBAL_VALUE (t);
7231 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
7232 otherwise the name is found in ridpointers from RID_INDEX. */
7235 record_builtin_type (rid_index, name, type)
7242 id = ridpointers[(int) rid_index];
7244 id = get_identifier (name);
7245 pushdecl (build_decl (TYPE_DECL, id, type));
7248 /* Build the void_list_node (void_type_node having been created). */
7250 build_void_list_node ()
7252 tree t = build_tree_list (NULL_TREE, void_type_node);