1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000
3 Free Software Foundation, Inc.
5 This file is part of GNU CC.
7 GNU CC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU CC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
47 extern cpp_reader parse_in;
50 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
52 { NORMAL, /* Ordinary declaration */
53 FUNCDEF, /* Function definition */
54 PARM, /* Declaration of parm before function body */
55 FIELD, /* Declaration inside struct or union */
56 BITFIELD, /* Likewise but with specified width */
57 TYPENAME}; /* Typename (inside cast or sizeof) */
59 /* We let tm.h override the types used here, to handle trivial differences
60 such as the choice of unsigned int or long unsigned int for size_t.
61 When machines start needing nontrivial differences in the size type,
62 it would be best to do something here to figure out automatically
63 from other information what type to use. */
66 #define SIZE_TYPE "long unsigned int"
70 #define PTRDIFF_TYPE "long int"
74 #define WCHAR_TYPE "int"
78 #define WINT_TYPE "unsigned int"
84 /* Nonzero if we have seen an invalid cross reference
85 to a struct, union, or enum, but not yet printed the message. */
87 tree pending_invalid_xref;
88 /* File and line to appear in the eventual error message. */
89 const char *pending_invalid_xref_file;
90 int pending_invalid_xref_line;
92 /* While defining an enum type, this is 1 plus the last enumerator
93 constant value. Note that will do not have to save this or `enum_overflow'
94 around nested function definition since such a definition could only
95 occur in an enum value expression and we don't use these variables in
98 static tree enum_next_value;
100 /* Nonzero means that there was overflow computing enum_next_value. */
102 static int enum_overflow;
104 /* Parsing a function declarator leaves a list of parameter names
105 or a chain or parameter decls here. */
107 static tree last_function_parms;
109 /* Parsing a function declarator leaves here a chain of structure
110 and enum types declared in the parmlist. */
112 static tree last_function_parm_tags;
114 /* After parsing the declarator that starts a function definition,
115 `start_function' puts here the list of parameter names or chain of decls.
116 `store_parm_decls' finds it here. */
118 static tree current_function_parms;
120 /* Similar, for last_function_parm_tags. */
121 static tree current_function_parm_tags;
123 /* Similar, for the file and line that the prototype came from if this is
124 an old-style definition. */
125 static const char *current_function_prototype_file;
126 static int current_function_prototype_line;
128 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
129 that have names. Here so we can clear out their names' definitions
130 at the end of the function. */
132 static tree named_labels;
134 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
136 static tree shadowed_labels;
138 /* Nonzero when store_parm_decls is called indicates a varargs function.
139 Value not meaningful after store_parm_decls. */
141 static int c_function_varargs;
143 /* Set to 0 at beginning of a function definition, set to 1 if
144 a return statement that specifies a return value is seen. */
146 int current_function_returns_value;
148 /* Set to 0 at beginning of a function definition, set to 1 if
149 a return statement with no argument is seen. */
151 int current_function_returns_null;
153 /* Set to nonzero by `grokdeclarator' for a function
154 whose return type is defaulted, if warnings for this are desired. */
156 static int warn_about_return_type;
158 /* Nonzero when starting a function declared `extern inline'. */
160 static int current_extern_inline;
162 /* For each binding contour we allocate a binding_level structure
163 * which records the names defined in that contour.
166 * 1) one for each function definition,
167 * where internal declarations of the parameters appear.
168 * 2) one for each compound statement,
169 * to record its declarations.
171 * The current meaning of a name can be found by searching the levels from
172 * the current one out to the global one.
175 /* Note that the information in the `names' component of the global contour
176 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
180 /* A chain of _DECL nodes for all variables, constants, functions,
181 and typedef types. These are in the reverse of the order supplied.
185 /* A list of structure, union and enum definitions,
186 * for looking up tag names.
187 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
188 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
189 * or ENUMERAL_TYPE node.
193 /* For each level, a list of shadowed outer-level local definitions
194 to be restored when this level is popped.
195 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
196 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
199 /* For each level (except not the global one),
200 a chain of BLOCK nodes for all the levels
201 that were entered and exited one level down. */
204 /* The BLOCK node for this level, if one has been preallocated.
205 If 0, the BLOCK is allocated (if needed) when the level is popped. */
208 /* The binding level which this one is contained in (inherits from). */
209 struct binding_level *level_chain;
211 /* Nonzero for the level that holds the parameters of a function. */
214 /* Nonzero if this level "doesn't exist" for tags. */
215 char tag_transparent;
217 /* Nonzero if sublevels of this level "don't exist" for tags.
218 This is set in the parm level of a function definition
219 while reading the function body, so that the outermost block
220 of the function body will be tag-transparent. */
221 char subblocks_tag_transparent;
223 /* Nonzero means make a BLOCK for this level regardless of all else. */
226 /* Nonzero means make a BLOCK if this level has any subblocks. */
227 char keep_if_subblocks;
229 /* Number of decls in `names' that have incomplete
230 structure or union types. */
233 /* A list of decls giving the (reversed) specified order of parms,
234 not including any forward-decls in the parmlist.
235 This is so we can put the parms in proper order for assign_parms. */
239 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
241 /* The binding level currently in effect. */
243 static struct binding_level *current_binding_level;
245 /* A chain of binding_level structures awaiting reuse. */
247 static struct binding_level *free_binding_level;
249 /* The outermost binding level, for names of file scope.
250 This is created when the compiler is started and exists
251 through the entire run. */
253 static struct binding_level *global_binding_level;
255 /* Binding level structures are initialized by copying this one. */
257 static struct binding_level clear_binding_level
258 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, 0,
261 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
263 static int keep_next_level_flag;
265 /* Nonzero means make a BLOCK for the next level pushed
266 if it has subblocks. */
268 static int keep_next_if_subblocks;
270 /* The chain of outer levels of label scopes.
271 This uses the same data structure used for binding levels,
272 but it works differently: each link in the chain records
273 saved values of named_labels and shadowed_labels for
274 a label binding level outside the current one. */
276 static struct binding_level *label_level_chain;
278 /* Functions called automatically at the beginning and end of execution. */
280 tree static_ctors, static_dtors;
282 /* Forward declarations. */
284 static struct binding_level * make_binding_level PARAMS ((void));
285 static void mark_binding_level PARAMS ((void *));
286 static void clear_limbo_values PARAMS ((tree));
287 static int duplicate_decls PARAMS ((tree, tree, int));
288 static int redeclaration_error_message PARAMS ((tree, tree));
289 static void storedecls PARAMS ((tree));
290 static void storetags PARAMS ((tree));
291 static tree lookup_tag PARAMS ((enum tree_code, tree,
292 struct binding_level *, int));
293 static tree lookup_tag_reverse PARAMS ((tree));
294 static tree grokdeclarator PARAMS ((tree, tree, enum decl_context,
296 static tree grokparms PARAMS ((tree, int));
297 static void layout_array_type PARAMS ((tree));
298 static tree c_make_fname_decl PARAMS ((tree, const char *, int));
300 /* C-specific option variables. */
302 /* Nonzero means allow type mismatches in conditional expressions;
303 just make their values `void'. */
305 int flag_cond_mismatch;
307 /* Nonzero means give `double' the same size as `float'. */
309 int flag_short_double;
311 /* Nonzero means give `wchar_t' the same size as `short'. */
313 int flag_short_wchar;
315 /* Nonzero means don't recognize the keyword `asm'. */
319 /* Nonzero means don't recognize any builtin functions. */
323 /* Nonzero means don't recognize the non-ANSI builtin functions.
326 int flag_no_nonansi_builtin;
328 /* Nonzero means do some things the same way PCC does. */
330 int flag_traditional;
332 /* Nonzero means enable C89 Amendment 1 features, other than digraphs. */
336 /* Nonzero means use the ISO C99 dialect of C. */
340 /* Nonzero means accept digraphs. */
342 int flag_digraphs = 1;
344 /* Nonzero means that we have builtin functions, and main is an int */
348 /* Nonzero means add default format_arg attributes for functions not
351 int flag_noniso_default_format_attributes = 1;
353 /* Nonzero means to allow single precision math even if we're generally
354 being traditional. */
355 int flag_allow_single_precision = 0;
357 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
359 int flag_signed_bitfields = 1;
360 int explicit_flag_signed_bitfields = 0;
362 /* Nonzero means warn about use of implicit int. */
364 int warn_implicit_int;
366 /* Nonzero means warn about usage of long long when `-pedantic'. */
368 int warn_long_long = 1;
370 /* Nonzero means message about use of implicit function declarations;
371 1 means warning; 2 means error. */
373 int mesg_implicit_function_declaration = -1;
375 /* Nonzero means give string constants the type `const char *'
376 to get extra warnings from them. These warnings will be too numerous
377 to be useful, except in thoroughly ANSIfied programs. */
379 int flag_const_strings;
381 /* Nonzero means warn about pointer casts that can drop a type qualifier
382 from the pointer target type. */
386 /* Nonzero means warn when casting a function call to a type that does
387 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
388 when there is no previous declaration of sqrt or malloc. */
390 int warn_bad_function_cast;
392 /* Warn about functions which might be candidates for attribute noreturn. */
394 int warn_missing_noreturn;
396 /* Warn about traditional constructs whose meanings changed in ANSI C. */
398 int warn_traditional;
400 /* Nonzero means warn about sizeof(function) or addition/subtraction
401 of function pointers. */
403 int warn_pointer_arith;
405 /* Nonzero means warn for non-prototype function decls
406 or non-prototyped defs without previous prototype. */
408 int warn_strict_prototypes;
410 /* Nonzero means warn for any global function def
411 without separate previous prototype decl. */
413 int warn_missing_prototypes;
415 /* Nonzero means warn for any global function def
416 without separate previous decl. */
418 int warn_missing_declarations;
420 /* Nonzero means warn about multiple (redundant) decls for the same single
421 variable or function. */
423 int warn_redundant_decls = 0;
425 /* Nonzero means warn about extern declarations of objects not at
426 file-scope level and about *all* declarations of functions (whether
427 extern or static) not at file-scope level. Note that we exclude
428 implicit function declarations. To get warnings about those, use
431 int warn_nested_externs = 0;
433 /* Warn about *printf or *scanf format/argument anomalies. */
437 /* Warn about a subscript that has type char. */
439 int warn_char_subscripts = 0;
441 /* Warn if a type conversion is done that might have confusing results. */
445 /* Warn if adding () is suggested. */
447 int warn_parentheses;
449 /* Warn if initializer is not completely bracketed. */
451 int warn_missing_braces;
453 /* Warn if main is suspicious. */
457 /* Warn about #pragma directives that are not recognised. */
459 int warn_unknown_pragmas = 0; /* Tri state variable. */
461 /* Warn about comparison of signed and unsigned values.
462 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
464 int warn_sign_compare = -1;
466 /* Warn about testing equality of floating point numbers. */
468 int warn_float_equal = 0;
470 /* Nonzero means warn about use of multicharacter literals. */
472 int warn_multichar = 1;
474 /* Wrapper since C and C++ expand_expr_stmt are different. */
476 expand_expr_stmt_fn lang_expand_expr_stmt = c_expand_expr_stmt;
478 /* The variant of the C language being processed. */
480 c_language_kind c_language = clk_c;
482 /* Nonzero means `$' can be in an identifier. */
484 #ifndef DOLLARS_IN_IDENTIFIERS
485 #define DOLLARS_IN_IDENTIFIERS 1
487 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
489 /* Decode the string P as a language-specific option for C.
490 Return the number of strings consumed. Should not complain
491 if it does not recognise the option. */
494 c_decode_option (argc, argv)
495 int argc ATTRIBUTE_UNUSED;
498 int strings_processed;
501 strings_processed = cpp_handle_option (&parse_in, argc, argv);
503 strings_processed = 0;
504 #endif /* ! USE_CPPLIB */
506 if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
508 flag_traditional = 1;
509 flag_writable_strings = 1;
512 else if (!strcmp (p, "-fallow-single-precision"))
513 flag_allow_single_precision = 1;
514 else if (!strcmp (p, "-fhosted") || !strcmp (p, "-fno-freestanding"))
519 else if (!strcmp (p, "-ffreestanding") || !strcmp (p, "-fno-hosted"))
523 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
527 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
529 flag_traditional = 0;
530 flag_writable_strings = 0;
533 else if (!strncmp (p, "-std=", 5))
535 /* Select the appropriate language standard. We currently
537 -std=iso9899:1990 same as -ansi
538 -std=iso9899:199409 ISO C as modified in amend. 1
539 -std=iso9899:1999 ISO C 99
540 -std=c89 same as -std=iso9899:1990
541 -std=c99 same as -std=iso9899:1999
542 -std=gnu89 default, iso9899:1990 + gnu extensions
543 -std=gnu99 iso9899:1999 + gnu extensions
545 const char *argstart = &p[5];
547 if (!strcmp (argstart, "iso9899:1990")
548 || !strcmp (argstart, "c89"))
554 flag_traditional = 0;
555 flag_writable_strings = 0;
557 flag_no_nonansi_builtin = 1;
558 flag_noniso_default_format_attributes = 0;
561 else if (!strcmp (argstart, "iso9899:199409"))
565 goto iso_1990_digraphs;
567 else if (!strcmp (argstart, "iso9899:199x")
568 || !strcmp (argstart, "iso9899:1999")
569 || !strcmp (argstart, "c9x")
570 || !strcmp (argstart, "c99"))
572 flag_traditional = 0;
573 flag_writable_strings = 0;
575 flag_no_nonansi_builtin = 1;
576 flag_noniso_default_format_attributes = 0;
581 else if (!strcmp (argstart, "gnu89"))
583 flag_traditional = 0;
584 flag_writable_strings = 0;
586 flag_no_nonansi_builtin = 0;
587 flag_noniso_default_format_attributes = 1;
592 else if (!strcmp (argstart, "gnu9x") || !strcmp (argstart, "gnu99"))
594 flag_traditional = 0;
595 flag_writable_strings = 0;
597 flag_no_nonansi_builtin = 0;
598 flag_noniso_default_format_attributes = 1;
604 error ("unknown C standard `%s'", argstart);
606 else if (!strcmp (p, "-fdollars-in-identifiers"))
607 dollars_in_ident = 1;
608 else if (!strcmp (p, "-fno-dollars-in-identifiers"))
609 dollars_in_ident = 0;
610 else if (!strcmp (p, "-fsigned-char"))
611 flag_signed_char = 1;
612 else if (!strcmp (p, "-funsigned-char"))
613 flag_signed_char = 0;
614 else if (!strcmp (p, "-fno-signed-char"))
615 flag_signed_char = 0;
616 else if (!strcmp (p, "-fno-unsigned-char"))
617 flag_signed_char = 1;
618 else if (!strcmp (p, "-fsigned-bitfields")
619 || !strcmp (p, "-fno-unsigned-bitfields"))
621 flag_signed_bitfields = 1;
622 explicit_flag_signed_bitfields = 1;
624 else if (!strcmp (p, "-funsigned-bitfields")
625 || !strcmp (p, "-fno-signed-bitfields"))
627 flag_signed_bitfields = 0;
628 explicit_flag_signed_bitfields = 1;
630 else if (!strcmp (p, "-fshort-enums"))
631 flag_short_enums = 1;
632 else if (!strcmp (p, "-fno-short-enums"))
633 flag_short_enums = 0;
634 else if (!strcmp (p, "-fshort-wchar"))
635 flag_short_wchar = 1;
636 else if (!strcmp (p, "-fno-short-wchar"))
637 flag_short_wchar = 0;
638 else if (!strcmp (p, "-fcond-mismatch"))
639 flag_cond_mismatch = 1;
640 else if (!strcmp (p, "-fno-cond-mismatch"))
641 flag_cond_mismatch = 0;
642 else if (!strcmp (p, "-fshort-double"))
643 flag_short_double = 1;
644 else if (!strcmp (p, "-fno-short-double"))
645 flag_short_double = 0;
646 else if (!strcmp (p, "-fasm"))
648 else if (!strcmp (p, "-fno-asm"))
650 else if (!strcmp (p, "-fbuiltin"))
652 else if (!strcmp (p, "-fno-builtin"))
654 else if (!strcmp (p, "-ansi"))
656 else if (!strcmp (p, "-Werror-implicit-function-declaration"))
657 mesg_implicit_function_declaration = 2;
658 else if (!strcmp (p, "-Wimplicit-function-declaration"))
659 mesg_implicit_function_declaration = 1;
660 else if (!strcmp (p, "-Wno-implicit-function-declaration"))
661 mesg_implicit_function_declaration = 0;
662 else if (!strcmp (p, "-Wimplicit-int"))
663 warn_implicit_int = 1;
664 else if (!strcmp (p, "-Wno-implicit-int"))
665 warn_implicit_int = 0;
666 else if (!strcmp (p, "-Wimplicit"))
668 warn_implicit_int = 1;
669 if (mesg_implicit_function_declaration != 2)
670 mesg_implicit_function_declaration = 1;
672 else if (!strcmp (p, "-Wno-implicit"))
673 warn_implicit_int = 0, mesg_implicit_function_declaration = 0;
674 else if (!strcmp (p, "-Wlong-long"))
676 else if (!strcmp (p, "-Wno-long-long"))
678 else if (!strcmp (p, "-Wwrite-strings"))
679 flag_const_strings = 1;
680 else if (!strcmp (p, "-Wno-write-strings"))
681 flag_const_strings = 0;
682 else if (!strcmp (p, "-Wcast-qual"))
684 else if (!strcmp (p, "-Wno-cast-qual"))
686 else if (!strcmp (p, "-Wbad-function-cast"))
687 warn_bad_function_cast = 1;
688 else if (!strcmp (p, "-Wno-bad-function-cast"))
689 warn_bad_function_cast = 0;
690 else if (!strcmp (p, "-Wmissing-noreturn"))
691 warn_missing_noreturn = 1;
692 else if (!strcmp (p, "-Wno-missing-noreturn"))
693 warn_missing_noreturn = 0;
694 else if (!strcmp (p, "-Wpointer-arith"))
695 warn_pointer_arith = 1;
696 else if (!strcmp (p, "-Wno-pointer-arith"))
697 warn_pointer_arith = 0;
698 else if (!strcmp (p, "-Wstrict-prototypes"))
699 warn_strict_prototypes = 1;
700 else if (!strcmp (p, "-Wno-strict-prototypes"))
701 warn_strict_prototypes = 0;
702 else if (!strcmp (p, "-Wmissing-prototypes"))
703 warn_missing_prototypes = 1;
704 else if (!strcmp (p, "-Wno-missing-prototypes"))
705 warn_missing_prototypes = 0;
706 else if (!strcmp (p, "-Wmissing-declarations"))
707 warn_missing_declarations = 1;
708 else if (!strcmp (p, "-Wno-missing-declarations"))
709 warn_missing_declarations = 0;
710 else if (!strcmp (p, "-Wredundant-decls"))
711 warn_redundant_decls = 1;
712 else if (!strcmp (p, "-Wno-redundant-decls"))
713 warn_redundant_decls = 0;
714 else if (!strcmp (p, "-Wnested-externs"))
715 warn_nested_externs = 1;
716 else if (!strcmp (p, "-Wno-nested-externs"))
717 warn_nested_externs = 0;
718 else if (!strcmp (p, "-Wtraditional"))
719 warn_traditional = 1;
720 else if (!strcmp (p, "-Wno-traditional"))
721 warn_traditional = 0;
722 else if (!strncmp (p, "-Wformat=", 9))
723 warn_format = atol (p + 9);
724 else if (!strcmp (p, "-Wformat"))
726 else if (!strcmp (p, "-Wno-format"))
728 else if (!strcmp (p, "-Wchar-subscripts"))
729 warn_char_subscripts = 1;
730 else if (!strcmp (p, "-Wno-char-subscripts"))
731 warn_char_subscripts = 0;
732 else if (!strcmp (p, "-Wconversion"))
734 else if (!strcmp (p, "-Wno-conversion"))
736 else if (!strcmp (p, "-Wparentheses"))
737 warn_parentheses = 1;
738 else if (!strcmp (p, "-Wno-parentheses"))
739 warn_parentheses = 0;
740 else if (!strcmp (p, "-Wreturn-type"))
741 warn_return_type = 1;
742 else if (!strcmp (p, "-Wno-return-type"))
743 warn_return_type = 0;
744 else if (!strcmp (p, "-Wcomment"))
745 ; /* cpp handles this one. */
746 else if (!strcmp (p, "-Wno-comment"))
747 ; /* cpp handles this one. */
748 else if (!strcmp (p, "-Wcomments"))
749 ; /* cpp handles this one. */
750 else if (!strcmp (p, "-Wno-comments"))
751 ; /* cpp handles this one. */
752 else if (!strcmp (p, "-Wtrigraphs"))
753 ; /* cpp handles this one. */
754 else if (!strcmp (p, "-Wno-trigraphs"))
755 ; /* cpp handles this one. */
756 else if (!strcmp (p, "-Wundef"))
757 ; /* cpp handles this one. */
758 else if (!strcmp (p, "-Wno-undef"))
759 ; /* cpp handles this one. */
760 else if (!strcmp (p, "-Wimport"))
761 ; /* cpp handles this one. */
762 else if (!strcmp (p, "-Wno-import"))
763 ; /* cpp handles this one. */
764 else if (!strcmp (p, "-Wmissing-braces"))
765 warn_missing_braces = 1;
766 else if (!strcmp (p, "-Wno-missing-braces"))
767 warn_missing_braces = 0;
768 else if (!strcmp (p, "-Wmain"))
770 else if (!strcmp (p, "-Wno-main"))
772 else if (!strcmp (p, "-Wsign-compare"))
773 warn_sign_compare = 1;
774 else if (!strcmp (p, "-Wno-sign-compare"))
775 warn_sign_compare = 0;
776 else if (!strcmp (p, "-Wfloat-equal"))
777 warn_float_equal = 1;
778 else if (!strcmp (p, "-Wno-float-equal"))
779 warn_float_equal = 0;
780 else if (!strcmp (p, "-Wmultichar"))
782 else if (!strcmp (p, "-Wno-multichar"))
784 else if (!strcmp (p, "-Wunknown-pragmas"))
785 /* Set to greater than 1, so that even unknown pragmas in system
786 headers will be warned about. */
787 warn_unknown_pragmas = 2;
788 else if (!strcmp (p, "-Wno-unknown-pragmas"))
789 warn_unknown_pragmas = 0;
790 else if (!strcmp (p, "-Wall"))
792 /* We save the value of warn_uninitialized, since if they put
793 -Wuninitialized on the command line, we need to generate a
794 warning about not using it without also specifying -O. */
795 if (warn_uninitialized != 1)
796 warn_uninitialized = 2;
797 warn_implicit_int = 1;
798 mesg_implicit_function_declaration = 1;
799 warn_return_type = 1;
803 warn_char_subscripts = 1;
804 warn_parentheses = 1;
805 warn_missing_braces = 1;
806 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
807 it off only if it's not explicit. */
809 /* Only warn about unknown pragmas that are not in system headers. */
810 warn_unknown_pragmas = 1;
813 return strings_processed;
818 /* Hooks for print_node. */
821 print_lang_decl (file, node, indent)
822 FILE *file ATTRIBUTE_UNUSED;
823 tree node ATTRIBUTE_UNUSED;
824 int indent ATTRIBUTE_UNUSED;
829 print_lang_type (file, node, indent)
830 FILE *file ATTRIBUTE_UNUSED;
831 tree node ATTRIBUTE_UNUSED;
832 int indent ATTRIBUTE_UNUSED;
837 print_lang_identifier (file, node, indent)
842 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
843 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
844 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
845 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
846 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
847 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
850 /* Hook called at end of compilation to assume 1 elt
851 for a top-level array decl that wasn't complete before. */
854 finish_incomplete_decl (decl)
857 if (TREE_CODE (decl) == VAR_DECL)
859 tree type = TREE_TYPE (decl);
860 if (type != error_mark_node
861 && TREE_CODE (type) == ARRAY_TYPE
862 && TYPE_DOMAIN (type) == 0)
864 if (! DECL_EXTERNAL (decl))
865 warning_with_decl (decl, "array `%s' assumed to have one element");
867 complete_array_type (type, NULL_TREE, 1);
869 layout_decl (decl, 0);
874 /* Create a new `struct binding_level'. */
876 static struct binding_level *
877 make_binding_level ()
880 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
883 /* Nonzero if we are currently in the global binding level. */
888 return current_binding_level == global_binding_level;
894 keep_next_level_flag = 1;
897 /* Nonzero if the current level needs to have a BLOCK made. */
902 return ((current_binding_level->keep_if_subblocks
903 && current_binding_level->blocks != 0)
904 || current_binding_level->keep
905 || current_binding_level->names != 0
906 || (current_binding_level->tags != 0
907 && !current_binding_level->tag_transparent));
910 /* Identify this binding level as a level of parameters.
911 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
912 But it turns out there is no way to pass the right value for
913 DEFINITION_FLAG, so we ignore it. */
916 declare_parm_level (definition_flag)
917 int definition_flag ATTRIBUTE_UNUSED;
919 current_binding_level->parm_flag = 1;
922 /* Nonzero if currently making parm declarations. */
927 return current_binding_level->parm_flag;
930 /* Enter a new binding level.
931 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
932 not for that of tags. */
935 pushlevel (tag_transparent)
938 register struct binding_level *newlevel = NULL_BINDING_LEVEL;
940 /* If this is the top level of a function,
941 just make sure that NAMED_LABELS is 0. */
943 if (current_binding_level == global_binding_level)
948 /* Reuse or create a struct for this binding level. */
950 if (free_binding_level)
952 newlevel = free_binding_level;
953 free_binding_level = free_binding_level->level_chain;
957 newlevel = make_binding_level ();
960 /* Add this level to the front of the chain (stack) of levels that
963 *newlevel = clear_binding_level;
964 newlevel->tag_transparent
966 || (current_binding_level
967 ? current_binding_level->subblocks_tag_transparent
969 newlevel->level_chain = current_binding_level;
970 current_binding_level = newlevel;
971 newlevel->keep = keep_next_level_flag;
972 keep_next_level_flag = 0;
973 newlevel->keep_if_subblocks = keep_next_if_subblocks;
974 keep_next_if_subblocks = 0;
977 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
980 clear_limbo_values (block)
985 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
986 if (DECL_NAME (tem) != 0)
987 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
989 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
990 clear_limbo_values (tem);
993 /* Exit a binding level.
994 Pop the level off, and restore the state of the identifier-decl mappings
995 that were in effect when this level was entered.
997 If KEEP is nonzero, this level had explicit declarations, so
998 and create a "block" (a BLOCK node) for the level
999 to record its declarations and subblocks for symbol table output.
1001 If FUNCTIONBODY is nonzero, this level is the body of a function,
1002 so create a block as if KEEP were set and also clear out all
1005 If REVERSE is nonzero, reverse the order of decls before putting
1006 them into the BLOCK. */
1009 poplevel (keep, reverse, functionbody)
1015 /* The chain of decls was accumulated in reverse order.
1016 Put it into forward order, just for cleanliness. */
1018 tree tags = current_binding_level->tags;
1019 tree subblocks = current_binding_level->blocks;
1022 int block_previously_created;
1024 keep |= current_binding_level->keep;
1026 /* This warning is turned off because it causes warnings for
1027 declarations like `extern struct foo *x'. */
1029 /* Warn about incomplete structure types in this level. */
1030 for (link = tags; link; link = TREE_CHAIN (link))
1031 if (!COMPLETE_TYPE_P (TREE_VALUE (link)))
1033 tree type = TREE_VALUE (link);
1034 tree type_name = TYPE_NAME (type);
1035 char *id = IDENTIFIER_POINTER (TREE_CODE (type_name) == IDENTIFIER_NODE
1037 : DECL_NAME (type_name));
1038 switch (TREE_CODE (type))
1041 error ("`struct %s' incomplete in scope ending here", id);
1044 error ("`union %s' incomplete in scope ending here", id);
1047 error ("`enum %s' incomplete in scope ending here", id);
1053 /* Get the decls in the order they were written.
1054 Usually current_binding_level->names is in reverse order.
1055 But parameter decls were previously put in forward order. */
1058 current_binding_level->names
1059 = decls = nreverse (current_binding_level->names);
1061 decls = current_binding_level->names;
1063 /* Output any nested inline functions within this block
1064 if they weren't already output. */
1066 for (decl = decls; decl; decl = TREE_CHAIN (decl))
1067 if (TREE_CODE (decl) == FUNCTION_DECL
1068 && ! TREE_ASM_WRITTEN (decl)
1069 && DECL_INITIAL (decl) != 0
1070 && TREE_ADDRESSABLE (decl))
1072 /* If this decl was copied from a file-scope decl
1073 on account of a block-scope extern decl,
1074 propagate TREE_ADDRESSABLE to the file-scope decl.
1076 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1077 true, since then the decl goes through save_for_inline_copying. */
1078 if (DECL_ABSTRACT_ORIGIN (decl) != 0
1079 && DECL_ABSTRACT_ORIGIN (decl) != decl)
1080 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
1081 else if (DECL_SAVED_INSNS (decl) != 0)
1083 push_function_context ();
1084 output_inline_function (decl);
1085 pop_function_context ();
1089 /* If there were any declarations or structure tags in that level,
1090 or if this level is a function body,
1091 create a BLOCK to record them for the life of this function. */
1094 block_previously_created = (current_binding_level->this_block != 0);
1095 if (block_previously_created)
1096 block = current_binding_level->this_block;
1097 else if (keep || functionbody
1098 || (current_binding_level->keep_if_subblocks && subblocks != 0))
1099 block = make_node (BLOCK);
1102 BLOCK_VARS (block) = decls;
1103 BLOCK_SUBBLOCKS (block) = subblocks;
1106 /* In each subblock, record that this is its superior. */
1108 for (link = subblocks; link; link = TREE_CHAIN (link))
1109 BLOCK_SUPERCONTEXT (link) = block;
1111 /* Clear out the meanings of the local variables of this level. */
1113 for (link = decls; link; link = TREE_CHAIN (link))
1115 if (DECL_NAME (link) != 0)
1117 /* If the ident. was used or addressed via a local extern decl,
1118 don't forget that fact. */
1119 if (DECL_EXTERNAL (link))
1121 if (TREE_USED (link))
1122 TREE_USED (DECL_NAME (link)) = 1;
1123 if (TREE_ADDRESSABLE (link))
1124 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1126 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1130 /* Restore all name-meanings of the outer levels
1131 that were shadowed by this level. */
1133 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1134 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1136 /* If the level being exited is the top level of a function,
1137 check over all the labels, and clear out the current
1138 (function local) meanings of their names. */
1142 clear_limbo_values (block);
1144 /* If this is the top level block of a function,
1145 the vars are the function's parameters.
1146 Don't leave them in the BLOCK because they are
1147 found in the FUNCTION_DECL instead. */
1149 BLOCK_VARS (block) = 0;
1151 /* Clear out the definitions of all label names,
1152 since their scopes end here,
1153 and add them to BLOCK_VARS. */
1155 for (link = named_labels; link; link = TREE_CHAIN (link))
1157 register tree label = TREE_VALUE (link);
1159 if (DECL_INITIAL (label) == 0)
1161 error_with_decl (label, "label `%s' used but not defined");
1162 /* Avoid crashing later. */
1163 define_label (input_filename, lineno,
1166 else if (warn_unused_label && !TREE_USED (label))
1167 warning_with_decl (label, "label `%s' defined but not used");
1168 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1170 /* Put the labels into the "variables" of the
1171 top-level block, so debugger can see them. */
1172 TREE_CHAIN (label) = BLOCK_VARS (block);
1173 BLOCK_VARS (block) = label;
1177 /* Pop the current level, and free the structure for reuse. */
1180 register struct binding_level *level = current_binding_level;
1181 current_binding_level = current_binding_level->level_chain;
1183 level->level_chain = free_binding_level;
1184 free_binding_level = level;
1187 /* Dispose of the block that we just made inside some higher level. */
1189 DECL_INITIAL (current_function_decl) = block;
1192 if (!block_previously_created)
1193 current_binding_level->blocks
1194 = chainon (current_binding_level->blocks, block);
1196 /* If we did not make a block for the level just exited,
1197 any blocks made for inner levels
1198 (since they cannot be recorded as subblocks in that level)
1199 must be carried forward so they will later become subblocks
1200 of something else. */
1202 current_binding_level->blocks
1203 = chainon (current_binding_level->blocks, subblocks);
1205 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1206 binding contour so that they point to the appropriate construct, i.e.
1207 either to the current FUNCTION_DECL node, or else to the BLOCK node
1208 we just constructed.
1210 Note that for tagged types whose scope is just the formal parameter
1211 list for some function type specification, we can't properly set
1212 their TYPE_CONTEXTs here, because we don't have a pointer to the
1213 appropriate FUNCTION_TYPE node readily available to us. For those
1214 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1215 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1216 node which will represent the "scope" for these "parameter list local"
1220 for (link = tags; link; link = TREE_CHAIN (link))
1221 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1223 for (link = tags; link; link = TREE_CHAIN (link))
1224 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1227 TREE_USED (block) = 1;
1231 /* Delete the node BLOCK from the current binding level.
1232 This is used for the block inside a stmt expr ({...})
1233 so that the block can be reinserted where appropriate. */
1236 delete_block (block)
1240 if (current_binding_level->blocks == block)
1241 current_binding_level->blocks = TREE_CHAIN (block);
1242 for (t = current_binding_level->blocks; t;)
1244 if (TREE_CHAIN (t) == block)
1245 TREE_CHAIN (t) = TREE_CHAIN (block);
1249 TREE_CHAIN (block) = NULL;
1250 /* Clear TREE_USED which is always set by poplevel.
1251 The flag is set again if insert_block is called. */
1252 TREE_USED (block) = 0;
1255 /* Insert BLOCK at the end of the list of subblocks of the
1256 current binding level. This is used when a BIND_EXPR is expanded,
1257 to handle the BLOCK node inside the BIND_EXPR. */
1260 insert_block (block)
1263 TREE_USED (block) = 1;
1264 current_binding_level->blocks
1265 = chainon (current_binding_level->blocks, block);
1268 /* Set the BLOCK node for the innermost scope
1269 (the one we are currently in). */
1273 register tree block;
1275 current_binding_level->this_block = block;
1281 register struct binding_level *newlevel;
1283 /* Reuse or create a struct for this binding level. */
1285 if (free_binding_level)
1287 newlevel = free_binding_level;
1288 free_binding_level = free_binding_level->level_chain;
1292 newlevel = make_binding_level ();
1295 /* Add this level to the front of the chain (stack) of label levels. */
1297 newlevel->level_chain = label_level_chain;
1298 label_level_chain = newlevel;
1300 newlevel->names = named_labels;
1301 newlevel->shadowed = shadowed_labels;
1303 shadowed_labels = 0;
1309 register struct binding_level *level = label_level_chain;
1312 /* Clear out the definitions of the declared labels in this level.
1313 Leave in the list any ordinary, non-declared labels. */
1314 for (link = named_labels, prev = 0; link;)
1316 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1318 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1320 error_with_decl (TREE_VALUE (link),
1321 "label `%s' used but not defined");
1322 /* Avoid crashing later. */
1323 define_label (input_filename, lineno,
1324 DECL_NAME (TREE_VALUE (link)));
1326 else if (warn_unused_label && !TREE_USED (TREE_VALUE (link)))
1327 warning_with_decl (TREE_VALUE (link),
1328 "label `%s' defined but not used");
1329 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1331 /* Delete this element from the list. */
1332 link = TREE_CHAIN (link);
1334 TREE_CHAIN (prev) = link;
1336 named_labels = link;
1341 link = TREE_CHAIN (link);
1345 /* Bring back all the labels that were shadowed. */
1346 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1347 if (DECL_NAME (TREE_VALUE (link)) != 0)
1348 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1349 = TREE_VALUE (link);
1351 named_labels = chainon (named_labels, level->names);
1352 shadowed_labels = level->shadowed;
1354 /* Pop the current level, and free the structure for reuse. */
1355 label_level_chain = label_level_chain->level_chain;
1356 level->level_chain = free_binding_level;
1357 free_binding_level = level;
1360 /* Push a definition or a declaration of struct, union or enum tag "name".
1361 "type" should be the type node.
1362 We assume that the tag "name" is not already defined.
1364 Note that the definition may really be just a forward reference.
1365 In that case, the TYPE_SIZE will be zero. */
1368 pushtag (name, type)
1371 register struct binding_level *b;
1373 /* Find the proper binding level for this type tag. */
1375 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1380 /* Record the identifier as the type's name if it has none. */
1382 if (TYPE_NAME (type) == 0)
1383 TYPE_NAME (type) = name;
1386 b->tags = tree_cons (name, type, b->tags);
1388 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1389 tagged type we just added to the current binding level. This fake
1390 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1391 to output a representation of a tagged type, and it also gives
1392 us a convenient place to record the "scope start" address for the
1395 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1397 /* An approximation for now, so we can tell this is a function-scope tag.
1398 This will be updated in poplevel. */
1399 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1402 /* Handle when a new declaration NEWDECL
1403 has the same name as an old one OLDDECL
1404 in the same binding contour.
1405 Prints an error message if appropriate.
1407 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1408 Otherwise, return 0.
1410 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1411 and OLDDECL is in an outer binding level and should thus not be changed. */
1414 duplicate_decls (newdecl, olddecl, different_binding_level)
1415 register tree newdecl, olddecl;
1416 int different_binding_level;
1418 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1419 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1420 && DECL_INITIAL (newdecl) != 0);
1421 tree oldtype = TREE_TYPE (olddecl);
1422 tree newtype = TREE_TYPE (newdecl);
1425 if (DECL_P (olddecl))
1426 DECL_MACHINE_ATTRIBUTES (newdecl)
1427 = merge_machine_decl_attributes (olddecl, newdecl);
1429 if (TREE_CODE (newtype) == ERROR_MARK
1430 || TREE_CODE (oldtype) == ERROR_MARK)
1433 /* New decl is completely inconsistent with the old one =>
1434 tell caller to replace the old one.
1435 This is always an error except in the case of shadowing a builtin. */
1436 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1438 if (TREE_CODE (olddecl) == FUNCTION_DECL
1439 && (DECL_BUILT_IN (olddecl)
1440 || DECL_BUILT_IN_NONANSI (olddecl)))
1442 /* If you declare a built-in or predefined function name as static,
1443 the old definition is overridden,
1444 but optionally warn this was a bad choice of name. */
1445 if (!TREE_PUBLIC (newdecl))
1449 else if (DECL_BUILT_IN (olddecl))
1450 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1452 warning_with_decl (newdecl, "shadowing library function `%s'");
1454 /* Likewise, if the built-in is not ansi, then programs can
1455 override it even globally without an error. */
1456 else if (! DECL_BUILT_IN (olddecl))
1457 warning_with_decl (newdecl,
1458 "library function `%s' declared as non-function");
1460 else if (DECL_BUILT_IN_NONANSI (olddecl))
1461 warning_with_decl (newdecl,
1462 "built-in function `%s' declared as non-function");
1464 warning_with_decl (newdecl,
1465 "built-in function `%s' declared as non-function");
1469 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1470 error_with_decl (olddecl, "previous declaration of `%s'");
1476 /* For real parm decl following a forward decl,
1477 return 1 so old decl will be reused. */
1478 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1479 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1482 /* The new declaration is the same kind of object as the old one.
1483 The declarations may partially match. Print warnings if they don't
1484 match enough. Ultimately, copy most of the information from the new
1485 decl to the old one, and keep using the old one. */
1487 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1488 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1489 && DECL_INITIAL (olddecl) == 0)
1490 /* If -traditional, avoid error for redeclaring fcn
1491 after implicit decl. */
1493 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1494 && DECL_BUILT_IN (olddecl))
1496 /* A function declaration for a built-in function. */
1497 if (!TREE_PUBLIC (newdecl))
1499 /* If you declare a built-in function name as static, the
1500 built-in definition is overridden,
1501 but optionally warn this was a bad choice of name. */
1503 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1504 /* Discard the old built-in function. */
1507 else if (!types_match)
1509 /* Accept the return type of the new declaration if same modes. */
1510 tree oldreturntype = TREE_TYPE (oldtype);
1511 tree newreturntype = TREE_TYPE (newtype);
1513 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1515 /* Function types may be shared, so we can't just modify
1516 the return type of olddecl's function type. */
1518 = build_function_type (newreturntype,
1519 TYPE_ARG_TYPES (oldtype));
1521 types_match = comptypes (newtype, trytype);
1525 /* Accept harmless mismatch in first argument type also.
1527 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1528 && TYPE_ARG_TYPES (oldtype) != 0
1529 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1530 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1531 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1532 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1534 /* Function types may be shared, so we can't just modify
1535 the return type of olddecl's function type. */
1537 = build_function_type (TREE_TYPE (oldtype),
1538 tree_cons (NULL_TREE,
1539 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1540 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1542 types_match = comptypes (newtype, trytype);
1546 if (! different_binding_level)
1547 TREE_TYPE (olddecl) = oldtype;
1551 /* If types don't match for a built-in, throw away the built-in. */
1552 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1556 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1557 && DECL_SOURCE_LINE (olddecl) == 0)
1559 /* A function declaration for a predeclared function
1560 that isn't actually built in. */
1561 if (!TREE_PUBLIC (newdecl))
1563 /* If you declare it as static, the
1564 default definition is overridden. */
1567 else if (!types_match)
1569 /* If the types don't match, preserve volatility indication.
1570 Later on, we will discard everything else about the
1571 default declaration. */
1572 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1575 /* Permit char *foo () to match void *foo (...) if not pedantic,
1576 if one of them came from a system header file. */
1577 else if (!types_match
1578 && TREE_CODE (olddecl) == FUNCTION_DECL
1579 && TREE_CODE (newdecl) == FUNCTION_DECL
1580 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1581 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1582 && (DECL_IN_SYSTEM_HEADER (olddecl)
1583 || DECL_IN_SYSTEM_HEADER (newdecl))
1584 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1585 && TYPE_ARG_TYPES (oldtype) == 0
1586 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1587 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1589 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1590 && TYPE_ARG_TYPES (newtype) == 0
1591 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1592 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1595 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1596 /* Make sure we keep void * as ret type, not char *. */
1597 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1598 TREE_TYPE (newdecl) = newtype = oldtype;
1600 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1601 we will come back here again. */
1602 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1604 else if (!types_match
1605 /* Permit char *foo (int, ...); followed by char *foo ();
1607 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1609 /* Return types must still match. */
1610 && comptypes (TREE_TYPE (oldtype),
1611 TREE_TYPE (newtype))
1612 && TYPE_ARG_TYPES (newtype) == 0))
1614 error_with_decl (newdecl, "conflicting types for `%s'");
1615 /* Check for function type mismatch
1616 involving an empty arglist vs a nonempty one. */
1617 if (TREE_CODE (olddecl) == FUNCTION_DECL
1618 && comptypes (TREE_TYPE (oldtype),
1619 TREE_TYPE (newtype))
1620 && ((TYPE_ARG_TYPES (oldtype) == 0
1621 && DECL_INITIAL (olddecl) == 0)
1623 (TYPE_ARG_TYPES (newtype) == 0
1624 && DECL_INITIAL (newdecl) == 0)))
1626 /* Classify the problem further. */
1627 register tree t = TYPE_ARG_TYPES (oldtype);
1629 t = TYPE_ARG_TYPES (newtype);
1630 for (; t; t = TREE_CHAIN (t))
1632 register tree type = TREE_VALUE (t);
1634 if (TREE_CHAIN (t) == 0
1635 && TYPE_MAIN_VARIANT (type) != void_type_node)
1637 error ("A parameter list with an ellipsis can't match an empty parameter name list declaration.");
1641 if (simple_type_promotes_to (type) != NULL_TREE)
1643 error ("An argument type that has a default promotion can't match an empty parameter name list declaration.");
1648 error_with_decl (olddecl, "previous declaration of `%s'");
1652 errmsg = redeclaration_error_message (newdecl, olddecl);
1658 error_with_decl (newdecl, "redefinition of `%s'");
1661 error_with_decl (newdecl, "redeclaration of `%s'");
1664 error_with_decl (newdecl, "conflicting declarations of `%s'");
1670 error_with_decl (olddecl,
1671 ((DECL_INITIAL (olddecl)
1672 && current_binding_level == global_binding_level)
1673 ? "`%s' previously defined here"
1674 : "`%s' previously declared here"));
1676 else if (TREE_CODE (newdecl) == TYPE_DECL
1677 && (DECL_IN_SYSTEM_HEADER (olddecl)
1678 || DECL_IN_SYSTEM_HEADER (newdecl)))
1680 warning_with_decl (newdecl, "redefinition of `%s'");
1683 ((DECL_INITIAL (olddecl)
1684 && current_binding_level == global_binding_level)
1685 ? "`%s' previously defined here"
1686 : "`%s' previously declared here"));
1688 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1689 && DECL_INITIAL (olddecl) != 0
1690 && TYPE_ARG_TYPES (oldtype) == 0
1691 && TYPE_ARG_TYPES (newtype) != 0
1692 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1694 register tree type, parm;
1696 /* Prototype decl follows defn w/o prototype. */
1698 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1699 type = TYPE_ARG_TYPES (newtype),
1702 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1704 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1705 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1707 warning_with_decl (newdecl, "prototype for `%s' follows");
1708 warning_with_decl (olddecl, "non-prototype definition here");
1711 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1712 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1714 error_with_decl (newdecl,
1715 "prototype for `%s' follows and number of arguments doesn't match");
1716 error_with_decl (olddecl, "non-prototype definition here");
1720 /* Type for passing arg must be consistent
1721 with that declared for the arg. */
1722 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1723 /* If -traditional, allow `unsigned int' instead of `int'
1724 in the prototype. */
1725 && (! (flag_traditional
1726 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1727 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1729 error_with_decl (newdecl,
1730 "prototype for `%s' follows and argument %d doesn't match",
1732 error_with_decl (olddecl, "non-prototype definition here");
1738 /* Warn about mismatches in various flags. */
1741 /* Warn if function is now inline
1742 but was previously declared not inline and has been called. */
1743 if (TREE_CODE (olddecl) == FUNCTION_DECL
1744 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1745 && TREE_USED (olddecl))
1746 warning_with_decl (newdecl,
1747 "`%s' declared inline after being called");
1748 if (TREE_CODE (olddecl) == FUNCTION_DECL
1749 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1750 && DECL_INITIAL (olddecl) != 0)
1751 warning_with_decl (newdecl,
1752 "`%s' declared inline after its definition");
1754 /* If pedantic, warn when static declaration follows a non-static
1755 declaration. Otherwise, do so only for functions. */
1756 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1757 && TREE_PUBLIC (olddecl)
1758 && !TREE_PUBLIC (newdecl))
1759 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1761 /* If warn_traditional, warn when a non-static function
1762 declaration follows a static one. */
1763 if (warn_traditional && !in_system_header
1764 && TREE_CODE (olddecl) == FUNCTION_DECL
1765 && !TREE_PUBLIC (olddecl)
1766 && TREE_PUBLIC (newdecl))
1767 warning_with_decl (newdecl, "non-static declaration for `%s' follows static");
1769 /* Warn when const declaration follows a non-const
1770 declaration, but not for functions. */
1771 if (TREE_CODE (olddecl) != FUNCTION_DECL
1772 && !TREE_READONLY (olddecl)
1773 && TREE_READONLY (newdecl))
1774 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1775 /* These bits are logically part of the type, for variables.
1776 But not for functions
1777 (where qualifiers are not valid ANSI anyway). */
1778 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1779 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1780 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1781 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1785 /* Optionally warn about more than one declaration for the same name. */
1786 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1787 /* Don't warn about a function declaration
1788 followed by a definition. */
1789 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1790 && DECL_INITIAL (olddecl) == 0)
1791 /* Don't warn about extern decl followed by (tentative) definition. */
1792 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1794 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1795 warning_with_decl (olddecl, "previous declaration of `%s'");
1798 /* Copy all the DECL_... slots specified in the new decl
1799 except for any that we copy here from the old type.
1801 Past this point, we don't change OLDTYPE and NEWTYPE
1802 even if we change the types of NEWDECL and OLDDECL. */
1806 /* When copying info to olddecl, we store into write_olddecl
1807 instead. This allows us to avoid modifying olddecl when
1808 different_binding_level is true. */
1809 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1811 /* Merge the data types specified in the two decls. */
1812 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1814 if (different_binding_level)
1816 = build_type_attribute_variant
1818 merge_attributes (TYPE_ATTRIBUTES (newtype),
1819 TYPE_ATTRIBUTES (oldtype)));
1822 = TREE_TYPE (olddecl)
1823 = common_type (newtype, oldtype);
1826 /* Lay the type out, unless already done. */
1827 if (oldtype != TREE_TYPE (newdecl))
1829 if (TREE_TYPE (newdecl) != error_mark_node)
1830 layout_type (TREE_TYPE (newdecl));
1831 if (TREE_CODE (newdecl) != FUNCTION_DECL
1832 && TREE_CODE (newdecl) != TYPE_DECL
1833 && TREE_CODE (newdecl) != CONST_DECL)
1834 layout_decl (newdecl, 0);
1838 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1839 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1840 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1841 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1842 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1843 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1845 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1846 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1850 /* Keep the old rtl since we can safely use it. */
1851 DECL_RTL (newdecl) = DECL_RTL (olddecl);
1853 /* Merge the type qualifiers. */
1854 if (TREE_CODE (olddecl) == FUNCTION_DECL
1855 && DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1856 && ! TREE_THIS_VOLATILE (newdecl))
1857 TREE_THIS_VOLATILE (write_olddecl) = 0;
1859 if (TREE_READONLY (newdecl))
1860 TREE_READONLY (write_olddecl) = 1;
1862 if (TREE_THIS_VOLATILE (newdecl))
1864 TREE_THIS_VOLATILE (write_olddecl) = 1;
1865 if (TREE_CODE (newdecl) == VAR_DECL
1866 /* If an automatic variable is re-declared in the same
1867 function scope, but the old declaration was not
1868 volatile, make_var_volatile() would crash because the
1869 variable would have been assigned to a pseudo, not a
1870 MEM. Since this duplicate declaration is invalid
1871 anyway, we just skip the call. */
1873 make_var_volatile (newdecl);
1876 /* Keep source location of definition rather than declaration. */
1877 /* When called with different_binding_level set, keep the old
1878 information so that meaningful diagnostics can be given. */
1879 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1880 && ! different_binding_level)
1882 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1883 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1886 /* Merge the unused-warning information. */
1887 if (DECL_IN_SYSTEM_HEADER (olddecl))
1888 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1889 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1890 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1892 /* Merge the initialization information. */
1893 /* When called with different_binding_level set, don't copy over
1894 DECL_INITIAL, so that we don't accidentally change function
1895 declarations into function definitions. */
1896 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1897 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1899 /* Merge the section attribute.
1900 We want to issue an error if the sections conflict but that must be
1901 done later in decl_attributes since we are called before attributes
1903 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1904 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1906 /* Copy the assembler name.
1907 Currently, it can only be defined in the prototype. */
1908 DECL_ASSEMBLER_NAME (newdecl) = DECL_ASSEMBLER_NAME (olddecl);
1910 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1912 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1913 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1915 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1916 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1917 DECL_NO_CHECK_MEMORY_USAGE (newdecl)
1918 |= DECL_NO_CHECK_MEMORY_USAGE (olddecl);
1919 DECL_NO_LIMIT_STACK (newdecl)
1920 |= DECL_NO_LIMIT_STACK (olddecl);
1923 /* If cannot merge, then use the new type and qualifiers,
1924 and don't preserve the old rtl. */
1925 else if (! different_binding_level)
1927 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1928 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1929 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1930 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1933 /* Merge the storage class information. */
1934 DECL_WEAK (newdecl) |= DECL_WEAK (olddecl);
1935 /* For functions, static overrides non-static. */
1936 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1938 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1939 /* This is since we don't automatically
1940 copy the attributes of NEWDECL into OLDDECL. */
1941 /* No need to worry about different_binding_level here because
1942 then TREE_PUBLIC (newdecl) was true. */
1943 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1944 /* If this clears `static', clear it in the identifier too. */
1945 if (! TREE_PUBLIC (olddecl))
1946 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1948 if (DECL_EXTERNAL (newdecl))
1950 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1951 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1952 /* An extern decl does not override previous storage class. */
1953 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1954 if (! DECL_EXTERNAL (newdecl))
1955 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1959 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1960 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1963 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1965 /* If either decl says `inline', this fn is inline,
1966 unless its definition was passed already. */
1967 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
1968 DECL_INLINE (olddecl) = 1;
1970 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1972 if (DECL_BUILT_IN (olddecl))
1974 /* Get rid of any built-in function if new arg types don't match it
1975 or if we have a function definition. */
1976 if (! types_match || new_is_definition)
1978 if (! different_binding_level)
1980 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1981 DECL_BUILT_IN_CLASS (olddecl) = NOT_BUILT_IN;
1986 /* If redeclaring a builtin function, and not a definition,
1987 it stays built in. */
1988 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1989 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1992 /* Also preserve various other info from the definition. */
1993 else if (! new_is_definition)
1994 DECL_FRAME_SIZE (newdecl) = DECL_FRAME_SIZE (olddecl);
1995 if (! new_is_definition)
1997 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1998 /* When called with different_binding_level set, don't copy over
1999 DECL_INITIAL, so that we don't accidentally change function
2000 declarations into function definitions. */
2001 if (! different_binding_level)
2002 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2003 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
2004 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2005 if (DECL_INLINE (newdecl))
2006 DECL_ABSTRACT_ORIGIN (newdecl) = DECL_ABSTRACT_ORIGIN (olddecl);
2009 if (different_binding_level)
2011 /* Don't output a duplicate symbol or debugging information for this
2014 Do not set TREE_ASM_WRITTEN for a FUNCTION_DECL since we may actually
2015 just have two declarations without a definition. VAR_DECLs may need
2016 the same treatment, I'm not sure. */
2017 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2018 DECL_IGNORED_P (newdecl) = 1;
2020 TREE_ASM_WRITTEN (newdecl) = DECL_IGNORED_P (newdecl) = 1;
2024 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2025 But preserve OLDDECL's DECL_UID. */
2027 register unsigned olddecl_uid = DECL_UID (olddecl);
2029 bcopy ((char *) newdecl + sizeof (struct tree_common),
2030 (char *) olddecl + sizeof (struct tree_common),
2031 sizeof (struct tree_decl) - sizeof (struct tree_common));
2032 DECL_UID (olddecl) = olddecl_uid;
2035 /* NEWDECL contains the merged attribute lists.
2036 Update OLDDECL to be the same. */
2037 DECL_MACHINE_ATTRIBUTES (olddecl) = DECL_MACHINE_ATTRIBUTES (newdecl);
2042 /* Record a decl-node X as belonging to the current lexical scope.
2043 Check for errors (such as an incompatible declaration for the same
2044 name already seen in the same scope).
2046 Returns either X or an old decl for the same name.
2047 If an old decl is returned, it may have been smashed
2048 to agree with what X says. */
2055 register tree name = DECL_NAME (x);
2056 register struct binding_level *b = current_binding_level;
2058 DECL_CONTEXT (x) = current_function_decl;
2059 /* A local extern declaration for a function doesn't constitute nesting.
2060 A local auto declaration does, since it's a forward decl
2061 for a nested function coming later. */
2062 if (TREE_CODE (x) == FUNCTION_DECL && DECL_INITIAL (x) == 0
2063 && DECL_EXTERNAL (x))
2064 DECL_CONTEXT (x) = 0;
2066 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
2067 && x != IDENTIFIER_IMPLICIT_DECL (name)
2068 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
2069 && !DECL_IN_SYSTEM_HEADER (x))
2070 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
2076 int different_binding_level = 0;
2078 t = lookup_name_current_level (name);
2079 /* Don't type check externs here when -traditional. This is so that
2080 code with conflicting declarations inside blocks will get warnings
2081 not errors. X11 for instance depends on this. */
2082 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
2084 t = IDENTIFIER_GLOBAL_VALUE (name);
2085 /* Type decls at global scope don't conflict with externs declared
2086 inside lexical blocks. */
2087 if (t && TREE_CODE (t) == TYPE_DECL)
2089 different_binding_level = 1;
2091 if (t != 0 && t == error_mark_node)
2092 /* error_mark_node is 0 for a while during initialization! */
2095 error_with_decl (x, "`%s' used prior to declaration");
2100 file = DECL_SOURCE_FILE (t);
2101 line = DECL_SOURCE_LINE (t);
2104 /* If this decl is `static' and an implicit decl was seen previously,
2105 warn. But don't complain if -traditional,
2106 since traditional compilers don't complain. */
2107 if (! flag_traditional && TREE_PUBLIC (name)
2108 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2109 sets this for all functions. */
2110 && ! TREE_PUBLIC (x)
2111 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2112 /* We used to warn also for explicit extern followed by static,
2113 but sometimes you need to do it that way. */
2114 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2116 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2117 IDENTIFIER_POINTER (name));
2118 pedwarn_with_file_and_line
2119 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2120 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2121 "previous declaration of `%s'",
2122 IDENTIFIER_POINTER (name));
2123 TREE_THIS_VOLATILE (name) = 1;
2126 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2128 if (TREE_CODE (t) == PARM_DECL)
2130 /* Don't allow more than one "real" duplicate
2131 of a forward parm decl. */
2132 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2138 /* If we are processing a typedef statement, generate a whole new
2139 ..._TYPE node (which will be just an variant of the existing
2140 ..._TYPE node with identical properties) and then install the
2141 TYPE_DECL node generated to represent the typedef name as the
2142 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2144 The whole point here is to end up with a situation where each
2145 and every ..._TYPE node the compiler creates will be uniquely
2146 associated with AT MOST one node representing a typedef name.
2147 This way, even though the compiler substitutes corresponding
2148 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2149 early on, later parts of the compiler can always do the reverse
2150 translation and get back the corresponding typedef name. For
2153 typedef struct S MY_TYPE;
2156 Later parts of the compiler might only know that `object' was of
2157 type `struct S' if it were not for code just below. With this
2158 code however, later parts of the compiler see something like:
2160 struct S' == struct S
2161 typedef struct S' MY_TYPE;
2164 And they can then deduce (from the node for type struct S') that
2165 the original object declaration was:
2169 Being able to do this is important for proper support of protoize,
2170 and also for generating precise symbolic debugging information
2171 which takes full account of the programmer's (typedef) vocabulary.
2173 Obviously, we don't want to generate a duplicate ..._TYPE node if
2174 the TYPE_DECL node that we are now processing really represents a
2175 standard built-in type.
2177 Since all standard types are effectively declared at line zero
2178 in the source file, we can easily check to see if we are working
2179 on a standard type by checking the current value of lineno. */
2181 if (TREE_CODE (x) == TYPE_DECL)
2183 if (DECL_SOURCE_LINE (x) == 0)
2185 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2186 TYPE_NAME (TREE_TYPE (x)) = x;
2188 else if (TREE_TYPE (x) != error_mark_node
2189 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2191 tree tt = TREE_TYPE (x);
2192 DECL_ORIGINAL_TYPE (x) = tt;
2193 tt = build_type_copy (tt);
2195 TREE_USED (tt) = TREE_USED (x);
2200 /* Multiple external decls of the same identifier ought to match.
2201 Check against both global declarations (when traditional) and out of
2202 scope (limbo) block level declarations.
2204 We get warnings about inline functions where they are defined.
2205 Avoid duplicate warnings where they are used. */
2207 && ! (TREE_CODE (x) == FUNCTION_DECL && DECL_INLINE (x)))
2211 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2212 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2213 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2214 decl = IDENTIFIER_GLOBAL_VALUE (name);
2215 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2216 /* Decls in limbo are always extern, so no need to check that. */
2217 decl = IDENTIFIER_LIMBO_VALUE (name);
2221 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2222 /* If old decl is built-in, we already warned if we should. */
2223 && !DECL_BUILT_IN (decl))
2225 pedwarn_with_decl (x,
2226 "type mismatch with previous external decl");
2227 pedwarn_with_decl (decl, "previous external decl of `%s'");
2231 /* If a function has had an implicit declaration, and then is defined,
2232 make sure they are compatible. */
2234 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2235 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2236 && TREE_CODE (x) == FUNCTION_DECL
2237 && ! comptypes (TREE_TYPE (x),
2238 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2240 warning_with_decl (x, "type mismatch with previous implicit declaration");
2241 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2242 "previous implicit declaration of `%s'");
2245 /* In PCC-compatibility mode, extern decls of vars with no current decl
2246 take effect at top level no matter where they are. */
2247 if (flag_traditional && DECL_EXTERNAL (x)
2248 && lookup_name (name) == 0)
2250 tree type = TREE_TYPE (x);
2252 /* But don't do this if the type contains temporary nodes. */
2255 if (type == error_mark_node)
2257 if (TYPE_CONTEXT (type))
2259 warning_with_decl (x, "type of external `%s' is not global");
2260 /* By exiting the loop early, we leave TYPE nonzero,
2261 and thus prevent globalization of the decl. */
2264 else if (TREE_CODE (type) == FUNCTION_TYPE
2265 && TYPE_ARG_TYPES (type) != 0)
2266 /* The types might not be truly local,
2267 but the list of arg types certainly is temporary.
2268 Since prototypes are nontraditional,
2269 ok not to do the traditional thing. */
2271 type = TREE_TYPE (type);
2275 b = global_binding_level;
2278 /* This name is new in its binding level.
2279 Install the new declaration and return it. */
2280 if (b == global_binding_level)
2282 /* Install a global value. */
2284 /* If the first global decl has external linkage,
2285 warn if we later see static one. */
2286 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2287 TREE_PUBLIC (name) = 1;
2289 IDENTIFIER_GLOBAL_VALUE (name) = x;
2291 /* We no longer care about any previous block level declarations. */
2292 IDENTIFIER_LIMBO_VALUE (name) = 0;
2294 /* Don't forget if the function was used via an implicit decl. */
2295 if (IDENTIFIER_IMPLICIT_DECL (name)
2296 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2297 TREE_USED (x) = 1, TREE_USED (name) = 1;
2299 /* Don't forget if its address was taken in that way. */
2300 if (IDENTIFIER_IMPLICIT_DECL (name)
2301 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2302 TREE_ADDRESSABLE (x) = 1;
2304 /* Warn about mismatches against previous implicit decl. */
2305 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2306 /* If this real decl matches the implicit, don't complain. */
2307 && ! (TREE_CODE (x) == FUNCTION_DECL
2308 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2309 == integer_type_node)))
2310 pedwarn ("`%s' was previously implicitly declared to return `int'",
2311 IDENTIFIER_POINTER (name));
2313 /* If this decl is `static' and an `extern' was seen previously,
2314 that is erroneous. */
2315 if (TREE_PUBLIC (name)
2316 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2318 /* Okay to redeclare an ANSI built-in as static. */
2319 if (t != 0 && DECL_BUILT_IN (t))
2321 /* Okay to declare a non-ANSI built-in as anything. */
2322 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2324 /* Okay to have global type decl after an earlier extern
2325 declaration inside a lexical block. */
2326 else if (TREE_CODE (x) == TYPE_DECL)
2328 else if (IDENTIFIER_IMPLICIT_DECL (name))
2330 if (! TREE_THIS_VOLATILE (name))
2331 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2332 IDENTIFIER_POINTER (name));
2335 pedwarn ("`%s' was declared `extern' and later `static'",
2336 IDENTIFIER_POINTER (name));
2341 /* Here to install a non-global value. */
2342 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2343 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2345 IDENTIFIER_LOCAL_VALUE (name) = x;
2347 /* If this is an extern function declaration, see if we
2348 have a global definition or declaration for the function. */
2351 && TREE_CODE (x) == FUNCTION_DECL
2352 && TREE_CODE (oldglobal) == FUNCTION_DECL
2353 && DECL_EXTERNAL (x) && ! DECL_INLINE (x))
2355 /* We have one. Their types must agree. */
2356 if (! comptypes (TREE_TYPE (x),
2357 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2358 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2361 /* Inner extern decl is inline if global one is.
2362 Copy enough to really inline it. */
2363 if (DECL_INLINE (oldglobal))
2365 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2366 DECL_INITIAL (x) = (current_function_decl == oldglobal
2367 ? 0 : DECL_INITIAL (oldglobal));
2368 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2369 DECL_FRAME_SIZE (x) = DECL_FRAME_SIZE (oldglobal);
2370 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2371 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2372 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2373 DECL_ABSTRACT_ORIGIN (x) = DECL_ORIGIN (oldglobal);
2375 /* Inner extern decl is built-in if global one is. */
2376 if (DECL_BUILT_IN (oldglobal))
2378 DECL_BUILT_IN_CLASS (x) = DECL_BUILT_IN_CLASS (oldglobal);
2379 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2381 /* Keep the arg types from a file-scope fcn defn. */
2382 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2383 && DECL_INITIAL (oldglobal)
2384 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2385 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2390 /* This case is probably sometimes the right thing to do. */
2391 /* If we have a local external declaration,
2392 then any file-scope declaration should not
2393 have been static. */
2394 if (oldlocal == 0 && oldglobal != 0
2395 && !TREE_PUBLIC (oldglobal)
2396 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2397 warning ("`%s' locally external but globally static",
2398 IDENTIFIER_POINTER (name));
2401 /* If we have a local external declaration,
2402 and no file-scope declaration has yet been seen,
2403 then if we later have a file-scope decl it must not be static. */
2405 && DECL_EXTERNAL (x)
2409 TREE_PUBLIC (name) = 1;
2411 /* Save this decl, so that we can do type checking against
2412 other decls after it falls out of scope.
2414 Only save it once. This prevents temporary decls created in
2415 expand_inline_function from being used here, since this
2416 will have been set when the inline function was parsed.
2417 It also helps give slightly better warnings. */
2418 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2419 IDENTIFIER_LIMBO_VALUE (name) = x;
2422 /* Warn if shadowing an argument at the top level of the body. */
2423 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2424 /* This warning doesn't apply to the parms of a nested fcn. */
2425 && ! current_binding_level->parm_flag
2426 /* Check that this is one level down from the parms. */
2427 && current_binding_level->level_chain->parm_flag
2428 /* Check that the decl being shadowed
2429 comes from the parm level, one level up. */
2430 && chain_member (oldlocal, current_binding_level->level_chain->names))
2432 if (TREE_CODE (oldlocal) == PARM_DECL)
2433 pedwarn ("declaration of `%s' shadows a parameter",
2434 IDENTIFIER_POINTER (name));
2436 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2437 IDENTIFIER_POINTER (name));
2440 /* Maybe warn if shadowing something else. */
2441 else if (warn_shadow && !DECL_EXTERNAL (x)
2442 /* No shadow warnings for internally generated vars. */
2443 && DECL_SOURCE_LINE (x) != 0
2444 /* No shadow warnings for vars made for inlining. */
2445 && ! DECL_FROM_INLINE (x))
2447 char *id = IDENTIFIER_POINTER (name);
2449 if (TREE_CODE (x) == PARM_DECL
2450 && current_binding_level->level_chain->parm_flag)
2451 /* Don't warn about the parm names in function declarator
2452 within a function declarator.
2453 It would be nice to avoid warning in any function
2454 declarator in a declaration, as opposed to a definition,
2455 but there is no way to tell it's not a definition. */
2457 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2458 warning ("declaration of `%s' shadows a parameter", id);
2459 else if (oldlocal != 0)
2460 warning ("declaration of `%s' shadows previous local", id);
2461 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2462 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2463 warning ("declaration of `%s' shadows global declaration", id);
2466 /* If storing a local value, there may already be one (inherited).
2467 If so, record it for restoration when this binding level ends. */
2469 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2472 /* Keep count of variables in this level with incomplete type.
2473 If the input is erroneous, we can have error_mark in the type
2474 slot (e.g. "f(void a, ...)") - that doesn't count as an
2476 if (TREE_TYPE (x) != error_mark_node
2477 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2481 /* Put decls on list in reverse order.
2482 We will reverse them later if necessary. */
2483 TREE_CHAIN (x) = b->names;
2489 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2492 pushdecl_top_level (x)
2496 register struct binding_level *b = current_binding_level;
2498 current_binding_level = global_binding_level;
2500 current_binding_level = b;
2504 /* Generate an implicit declaration for identifier FUNCTIONID
2505 as a function of type int (). Print a warning if appropriate. */
2508 implicitly_declare (functionid)
2512 int traditional_warning = 0;
2513 /* Only one "implicit declaration" warning per identifier. */
2514 int implicit_warning;
2516 /* We used to reuse an old implicit decl here,
2517 but this loses with inline functions because it can clobber
2518 the saved decl chains. */
2520 if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2521 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2524 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2526 /* Warn of implicit decl following explicit local extern decl.
2527 This is probably a program designed for traditional C. */
2528 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2529 traditional_warning = 1;
2531 /* Warn once of an implicit declaration. */
2532 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2534 DECL_EXTERNAL (decl) = 1;
2535 TREE_PUBLIC (decl) = 1;
2537 /* Record that we have an implicit decl and this is it. */
2538 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2540 /* ANSI standard says implicit declarations are in the innermost block.
2541 So we record the decl in the standard fashion.
2542 If flag_traditional is set, pushdecl does it top-level. */
2545 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2546 maybe_objc_check_decl (decl);
2548 rest_of_decl_compilation (decl, NULL_PTR, 0, 0);
2550 if (implicit_warning)
2551 implicit_decl_warning (functionid);
2552 else if (warn_traditional && traditional_warning)
2553 warning ("function `%s' was previously declared within a block",
2554 IDENTIFIER_POINTER (functionid));
2556 /* Write a record describing this implicit function declaration to the
2557 prototypes file (if requested). */
2559 gen_aux_info_record (decl, 0, 1, 0);
2565 implicit_decl_warning (id)
2568 char *name = IDENTIFIER_POINTER (id);
2569 if (mesg_implicit_function_declaration == 2)
2570 error ("implicit declaration of function `%s'", name);
2571 else if (mesg_implicit_function_declaration == 1)
2572 warning ("implicit declaration of function `%s'", name);
2575 /* Return zero if the declaration NEWDECL is valid
2576 when the declaration OLDDECL (assumed to be for the same name)
2577 has already been seen.
2578 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
2579 and 3 if it is a conflicting declaration. */
2582 redeclaration_error_message (newdecl, olddecl)
2583 tree newdecl, olddecl;
2585 if (TREE_CODE (newdecl) == TYPE_DECL)
2587 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2589 /* pushdecl creates distinct types for TYPE_DECLs by calling
2590 build_type_copy, so the above comparison generally fails. We do
2591 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2592 is equivalent to what this code used to do before the build_type_copy
2593 call. The variant type distinction should not matter for traditional
2594 code, because it doesn't have type qualifiers. */
2595 if (flag_traditional
2596 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
2598 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2602 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2604 /* Declarations of functions can insist on internal linkage
2605 but they can't be inconsistent with internal linkage,
2606 so there can be no error on that account.
2607 However defining the same name twice is no good. */
2608 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2609 /* However, defining once as extern inline and a second
2610 time in another way is ok. */
2611 && ! (DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2612 && ! (DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2616 else if (current_binding_level == global_binding_level)
2618 /* Objects declared at top level: */
2619 /* If at least one is a reference, it's ok. */
2620 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2622 /* Reject two definitions. */
2623 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2625 /* Now we have two tentative defs, or one tentative and one real def. */
2626 /* Insist that the linkage match. */
2627 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2631 else if (current_binding_level->parm_flag
2632 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2636 /* Newdecl has block scope. If olddecl has block scope also, then
2637 reject two definitions, and reject a definition together with an
2638 external reference. Otherwise, it is OK, because newdecl must
2639 be an extern reference to olddecl. */
2640 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2641 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2647 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2648 Create one if none exists so far for the current function.
2649 This function is called for both label definitions and label references. */
2655 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2657 if (current_function_decl == 0)
2659 error ("label %s referenced outside of any function",
2660 IDENTIFIER_POINTER (id));
2664 /* Use a label already defined or ref'd with this name. */
2667 /* But not if it is inherited and wasn't declared to be inheritable. */
2668 if (DECL_CONTEXT (decl) != current_function_decl
2669 && ! C_DECLARED_LABEL_FLAG (decl))
2670 return shadow_label (id);
2674 decl = build_decl (LABEL_DECL, id, void_type_node);
2676 /* Make sure every label has an rtx. */
2679 /* A label not explicitly declared must be local to where it's ref'd. */
2680 DECL_CONTEXT (decl) = current_function_decl;
2682 DECL_MODE (decl) = VOIDmode;
2684 /* Say where one reference is to the label,
2685 for the sake of the error if it is not defined. */
2686 DECL_SOURCE_LINE (decl) = lineno;
2687 DECL_SOURCE_FILE (decl) = input_filename;
2689 IDENTIFIER_LABEL_VALUE (id) = decl;
2691 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2696 /* Make a label named NAME in the current function,
2697 shadowing silently any that may be inherited from containing functions
2698 or containing scopes.
2700 Note that valid use, if the label being shadowed
2701 comes from another scope in the same function,
2702 requires calling declare_nonlocal_label right away. */
2708 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2714 /* Check to make sure that the label hasn't already been declared
2715 at this label scope */
2716 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2717 if (TREE_VALUE (dup) == decl)
2719 error ("duplicate label declaration `%s'",
2720 IDENTIFIER_POINTER (name));
2721 error_with_decl (TREE_VALUE (dup),
2722 "this is a previous declaration");
2723 /* Just use the previous declaration. */
2724 return lookup_label (name);
2727 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2728 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2731 return lookup_label (name);
2734 /* Define a label, specifying the location in the source file.
2735 Return the LABEL_DECL node for the label, if the definition is valid.
2736 Otherwise return 0. */
2739 define_label (filename, line, name)
2740 const char *filename;
2744 tree decl = lookup_label (name);
2746 /* If label with this name is known from an outer context, shadow it. */
2747 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2749 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2750 IDENTIFIER_LABEL_VALUE (name) = 0;
2751 decl = lookup_label (name);
2754 if (warn_traditional && !in_system_header && lookup_name (name))
2755 warning ("traditional C lacks a separate namespace for labels, identifier `%s' conflicts",
2756 IDENTIFIER_POINTER (name));
2758 if (DECL_INITIAL (decl) != 0)
2760 error ("duplicate label `%s'", IDENTIFIER_POINTER (name));
2765 /* Mark label as having been defined. */
2766 DECL_INITIAL (decl) = error_mark_node;
2767 /* Say where in the source. */
2768 DECL_SOURCE_FILE (decl) = filename;
2769 DECL_SOURCE_LINE (decl) = line;
2774 /* Return the list of declarations of the current level.
2775 Note that this list is in reverse order unless/until
2776 you nreverse it; and when you do nreverse it, you must
2777 store the result back using `storedecls' or you will lose. */
2782 return current_binding_level->names;
2785 /* Return the list of type-tags (for structs, etc) of the current level. */
2790 return current_binding_level->tags;
2793 /* Store the list of declarations of the current level.
2794 This is done for the parameter declarations of a function being defined,
2795 after they are modified in the light of any missing parameters. */
2801 current_binding_level->names = decls;
2804 /* Similarly, store the list of tags of the current level. */
2810 current_binding_level->tags = tags;
2813 /* Given NAME, an IDENTIFIER_NODE,
2814 return the structure (or union or enum) definition for that name.
2815 Searches binding levels from BINDING_LEVEL up to the global level.
2816 If THISLEVEL_ONLY is nonzero, searches only the specified context
2817 (but skips any tag-transparent contexts to find one that is
2818 meaningful for tags).
2819 CODE says which kind of type the caller wants;
2820 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2821 If the wrong kind of type is found, an error is reported. */
2824 lookup_tag (code, name, binding_level, thislevel_only)
2825 enum tree_code code;
2826 struct binding_level *binding_level;
2830 register struct binding_level *level;
2832 for (level = binding_level; level; level = level->level_chain)
2835 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2837 if (TREE_PURPOSE (tail) == name)
2839 if (TREE_CODE (TREE_VALUE (tail)) != code)
2841 /* Definition isn't the kind we were looking for. */
2842 pending_invalid_xref = name;
2843 pending_invalid_xref_file = input_filename;
2844 pending_invalid_xref_line = lineno;
2846 return TREE_VALUE (tail);
2849 if (thislevel_only && ! level->tag_transparent)
2855 /* Print an error message now
2856 for a recent invalid struct, union or enum cross reference.
2857 We don't print them immediately because they are not invalid
2858 when used in the `struct foo;' construct for shadowing. */
2861 pending_xref_error ()
2863 if (pending_invalid_xref != 0)
2864 error_with_file_and_line (pending_invalid_xref_file,
2865 pending_invalid_xref_line,
2866 "`%s' defined as wrong kind of tag",
2867 IDENTIFIER_POINTER (pending_invalid_xref));
2868 pending_invalid_xref = 0;
2871 /* Given a type, find the tag that was defined for it and return the tag name.
2872 Otherwise return 0. */
2875 lookup_tag_reverse (type)
2878 register struct binding_level *level;
2880 for (level = current_binding_level; level; level = level->level_chain)
2883 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2885 if (TREE_VALUE (tail) == type)
2886 return TREE_PURPOSE (tail);
2892 /* Look up NAME in the current binding level and its superiors
2893 in the namespace of variables, functions and typedefs.
2894 Return a ..._DECL node of some kind representing its definition,
2895 or return 0 if it is undefined. */
2902 if (current_binding_level != global_binding_level
2903 && IDENTIFIER_LOCAL_VALUE (name))
2904 val = IDENTIFIER_LOCAL_VALUE (name);
2906 val = IDENTIFIER_GLOBAL_VALUE (name);
2910 /* Similar to `lookup_name' but look only at current binding level. */
2913 lookup_name_current_level (name)
2918 if (current_binding_level == global_binding_level)
2919 return IDENTIFIER_GLOBAL_VALUE (name);
2921 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2924 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2925 if (DECL_NAME (t) == name)
2931 /* Mark ARG for GC. */
2934 mark_binding_level (arg)
2937 struct binding_level *level = *(struct binding_level **) arg;
2939 for (; level != 0; level = level->level_chain)
2941 ggc_mark_tree (level->names);
2942 ggc_mark_tree (level->tags);
2943 ggc_mark_tree (level->shadowed);
2944 ggc_mark_tree (level->blocks);
2945 ggc_mark_tree (level->this_block);
2946 ggc_mark_tree (level->parm_order);
2950 /* Create the predefined scalar types of C,
2951 and some nodes representing standard constants (0, 1, (void *) 0).
2952 Initialize the global binding level.
2953 Make definitions for built-in primitive functions. */
2956 init_decl_processing ()
2958 register tree endlink;
2959 tree ptr_ftype_void, ptr_ftype_ptr;
2960 int wchar_type_size;
2961 tree array_domain_type;
2964 current_function_decl = NULL;
2965 named_labels = NULL;
2966 current_binding_level = NULL_BINDING_LEVEL;
2967 free_binding_level = NULL_BINDING_LEVEL;
2969 /* Make the binding_level structure for global names. */
2971 global_binding_level = current_binding_level;
2973 build_common_tree_nodes (flag_signed_char);
2975 /* Define `int' and `char' first so that dbx will output them first. */
2976 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_INT],
2977 integer_type_node));
2978 pushdecl (build_decl (TYPE_DECL, get_identifier ("char"),
2980 pushdecl (build_decl (TYPE_DECL, get_identifier ("long int"),
2981 long_integer_type_node));
2982 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned int"),
2983 unsigned_type_node));
2984 pushdecl (build_decl (TYPE_DECL, get_identifier ("long unsigned int"),
2985 long_unsigned_type_node));
2986 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long int"),
2987 long_long_integer_type_node));
2988 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long unsigned int"),
2989 long_long_unsigned_type_node));
2990 pushdecl (build_decl (TYPE_DECL, get_identifier ("short int"),
2991 short_integer_type_node));
2992 pushdecl (build_decl (TYPE_DECL, get_identifier ("short unsigned int"),
2993 short_unsigned_type_node));
2994 pushdecl (build_decl (TYPE_DECL, get_identifier ("signed char"),
2995 signed_char_type_node));
2996 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned char"),
2997 unsigned_char_type_node));
2998 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intQI_type_node));
2999 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intHI_type_node));
3000 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intSI_type_node));
3001 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
3002 #if HOST_BITS_PER_WIDE_INT >= 64
3003 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intTI_type_node));
3005 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node));
3006 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intHI_type_node));
3007 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intSI_type_node));
3008 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node));
3009 #if HOST_BITS_PER_WIDE_INT >= 64
3010 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intTI_type_node));
3013 /* `unsigned long' is the standard type for sizeof.
3014 Traditionally, use a signed type.
3015 Note that stddef.h uses `unsigned long',
3016 and this must agree, even if long and int are the same size. */
3017 t = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE)));
3018 signed_size_type_node = signed_type (t);
3019 if (flag_traditional && TREE_UNSIGNED (t))
3020 t = signed_type (t);
3024 /* Create the widest literal types. */
3025 widest_integer_literal_type_node
3026 = make_signed_type (HOST_BITS_PER_WIDE_INT * 2);
3027 widest_unsigned_literal_type_node
3028 = make_unsigned_type (HOST_BITS_PER_WIDE_INT * 2);
3029 pushdecl (build_decl (TYPE_DECL, NULL_TREE,
3030 widest_integer_literal_type_node));
3031 pushdecl (build_decl (TYPE_DECL, NULL_TREE,
3032 widest_unsigned_literal_type_node));
3034 build_common_tree_nodes_2 (flag_short_double);
3036 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_FLOAT],
3038 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_DOUBLE],
3040 pushdecl (build_decl (TYPE_DECL, get_identifier ("long double"),
3041 long_double_type_node));
3042 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex int"),
3043 complex_integer_type_node));
3044 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex float"),
3045 complex_float_type_node));
3046 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex double"),
3047 complex_double_type_node));
3048 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex long double"),
3049 complex_long_double_type_node));
3050 pushdecl (build_decl (TYPE_DECL,
3051 ridpointers[(int) RID_VOID], void_type_node));
3053 #ifdef MD_INIT_BUILTINS
3057 wchar_type_node = get_identifier (flag_short_wchar
3058 ? "short unsigned int"
3060 wchar_type_node = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (wchar_type_node));
3061 wchar_type_size = TYPE_PRECISION (wchar_type_node);
3062 signed_wchar_type_node = signed_type (wchar_type_node);
3063 unsigned_wchar_type_node = unsigned_type (wchar_type_node);
3066 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (WINT_TYPE)));
3068 boolean_type_node = integer_type_node;
3069 boolean_true_node = integer_one_node;
3070 boolean_false_node = integer_zero_node;
3072 string_type_node = build_pointer_type (char_type_node);
3073 const_string_type_node
3074 = build_pointer_type (build_type_variant (char_type_node, 1, 0));
3076 /* Make a type to be the domain of a few array types
3077 whose domains don't really matter.
3078 200 is small enough that it always fits in size_t
3079 and large enough that it can hold most function names for the
3080 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
3081 array_domain_type = build_index_type (build_int_2 (200, 0));
3083 /* make a type for arrays of characters.
3084 With luck nothing will ever really depend on the length of this
3086 char_array_type_node = build_array_type (char_type_node, array_domain_type);
3088 /* Likewise for arrays of ints. */
3090 = build_array_type (integer_type_node, array_domain_type);
3092 /* This is for wide string constants. */
3093 wchar_array_type_node
3094 = build_array_type (wchar_type_node, array_domain_type);
3096 void_list_node = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
3098 default_function_type = build_function_type (integer_type_node, NULL_TREE);
3100 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE)));
3101 unsigned_ptrdiff_type_node = unsigned_type (ptrdiff_type_node);
3103 c_common_nodes_and_builtins (0, flag_no_builtin, flag_no_nonansi_builtin);
3105 endlink = void_list_node;
3106 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
3108 = build_function_type (ptr_type_node,
3109 tree_cons (NULL_TREE, ptr_type_node, endlink));
3111 /* Types which are common to the fortran compiler and libf2c. When
3112 changing these, you also need to be concerned with f/com.h. */
3114 if (TYPE_PRECISION (float_type_node)
3115 == TYPE_PRECISION (long_integer_type_node))
3117 g77_integer_type_node = long_integer_type_node;
3118 g77_uinteger_type_node = long_unsigned_type_node;
3120 else if (TYPE_PRECISION (float_type_node)
3121 == TYPE_PRECISION (integer_type_node))
3123 g77_integer_type_node = integer_type_node;
3124 g77_uinteger_type_node = unsigned_type_node;
3127 g77_integer_type_node = g77_uinteger_type_node = NULL_TREE;
3129 if (g77_integer_type_node != NULL_TREE)
3131 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_integer"),
3132 g77_integer_type_node));
3133 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_uinteger"),
3134 g77_uinteger_type_node));
3137 if (TYPE_PRECISION (float_type_node) * 2
3138 == TYPE_PRECISION (long_integer_type_node))
3140 g77_longint_type_node = long_integer_type_node;
3141 g77_ulongint_type_node = long_unsigned_type_node;
3143 else if (TYPE_PRECISION (float_type_node) * 2
3144 == TYPE_PRECISION (long_long_integer_type_node))
3146 g77_longint_type_node = long_long_integer_type_node;
3147 g77_ulongint_type_node = long_long_unsigned_type_node;
3150 g77_longint_type_node = g77_ulongint_type_node = NULL_TREE;
3152 if (g77_longint_type_node != NULL_TREE)
3154 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_longint"),
3155 g77_longint_type_node));
3156 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_ulongint"),
3157 g77_ulongint_type_node));
3160 builtin_function ("__builtin_aggregate_incoming_address",
3161 build_function_type (ptr_type_node, NULL_TREE),
3162 BUILT_IN_AGGREGATE_INCOMING_ADDRESS,
3163 BUILT_IN_NORMAL, NULL_PTR);
3165 /* Hooks for the DWARF 2 __throw routine. */
3166 builtin_function ("__builtin_unwind_init",
3167 build_function_type (void_type_node, endlink),
3168 BUILT_IN_UNWIND_INIT, BUILT_IN_NORMAL, NULL_PTR);
3169 builtin_function ("__builtin_dwarf_cfa", ptr_ftype_void,
3170 BUILT_IN_DWARF_CFA, BUILT_IN_NORMAL, NULL_PTR);
3171 builtin_function ("__builtin_dwarf_fp_regnum",
3172 build_function_type (unsigned_type_node, endlink),
3173 BUILT_IN_DWARF_FP_REGNUM, BUILT_IN_NORMAL, NULL_PTR);
3174 builtin_function ("__builtin_init_dwarf_reg_size_table", void_ftype_ptr,
3175 BUILT_IN_INIT_DWARF_REG_SIZES, BUILT_IN_NORMAL, NULL_PTR);
3176 builtin_function ("__builtin_frob_return_addr", ptr_ftype_ptr,
3177 BUILT_IN_FROB_RETURN_ADDR, BUILT_IN_NORMAL, NULL_PTR);
3178 builtin_function ("__builtin_extract_return_addr", ptr_ftype_ptr,
3179 BUILT_IN_EXTRACT_RETURN_ADDR, BUILT_IN_NORMAL, NULL_PTR);
3181 ("__builtin_eh_return",
3182 build_function_type (void_type_node,
3183 tree_cons (NULL_TREE, ptr_type_node,
3184 tree_cons (NULL_TREE,
3185 type_for_mode (ptr_mode, 0),
3186 tree_cons (NULL_TREE,
3189 BUILT_IN_EH_RETURN, BUILT_IN_NORMAL, NULL_PTR);
3191 pedantic_lvalues = pedantic;
3193 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
3194 make_fname_decl = c_make_fname_decl;
3195 declare_function_name ();
3197 start_identifier_warnings ();
3199 /* Prepare to check format strings against argument lists. */
3200 init_function_format_info ();
3202 incomplete_decl_finalize_hook = finish_incomplete_decl;
3204 /* Record our roots. */
3206 ggc_add_tree_root (c_global_trees, CTI_MAX);
3207 ggc_add_tree_root (&named_labels, 1);
3208 ggc_add_tree_root (&shadowed_labels, 1);
3209 ggc_add_root (¤t_binding_level, 1, sizeof current_binding_level,
3210 mark_binding_level);
3211 ggc_add_root (&label_level_chain, 1, sizeof label_level_chain,
3212 mark_binding_level);
3213 ggc_add_tree_root (&static_ctors, 1);
3214 ggc_add_tree_root (&static_dtors, 1);
3217 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3218 decl, NAME is the initialization string and TYPE_DEP indicates whether
3219 NAME depended on the type of the function. As we don't yet implement
3220 delayed emission of static data, we mark the decl as emitted
3221 so it is not placed in the output. Anything using it must therefore pull
3222 out the STRING_CST initializer directly. This does mean that these names
3223 are string merging candidates, which C99 does not permit. */
3226 c_make_fname_decl (id, name, type_dep)
3229 int type_dep ATTRIBUTE_UNUSED;
3231 tree decl, type, init;
3232 size_t length = strlen (name);
3234 type = build_array_type
3235 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
3236 build_index_type (build_int_2 (length, 0)));
3238 decl = build_decl (VAR_DECL, id, type);
3239 TREE_STATIC (decl) = 1;
3240 TREE_READONLY (decl) = 1;
3241 TREE_ASM_WRITTEN (decl) = 1;
3242 DECL_SOURCE_LINE (decl) = 0;
3243 DECL_ARTIFICIAL (decl) = 1;
3244 DECL_IN_SYSTEM_HEADER (decl) = 1;
3245 DECL_IGNORED_P (decl) = 1;
3246 init = build_string (length + 1, name);
3247 TREE_TYPE (init) = type;
3248 DECL_INITIAL (decl) = init;
3249 finish_decl (pushdecl (decl), init, NULL_TREE);
3254 /* Return a definition for a builtin function named NAME and whose data type
3255 is TYPE. TYPE should be a function type with argument types.
3256 FUNCTION_CODE tells later passes how to compile calls to this function.
3257 See tree.h for its possible values.
3259 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3260 the name to be called if we can't opencode the function. */
3263 builtin_function (name, type, function_code, class, library_name)
3267 enum built_in_class class;
3268 const char *library_name;
3270 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3271 DECL_EXTERNAL (decl) = 1;
3272 TREE_PUBLIC (decl) = 1;
3273 /* If -traditional, permit redefining a builtin function any way you like.
3274 (Though really, if the program redefines these functions,
3275 it probably won't work right unless compiled with -fno-builtin.) */
3276 if (flag_traditional && name[0] != '_')
3277 DECL_BUILT_IN_NONANSI (decl) = 1;
3279 DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
3280 make_decl_rtl (decl, NULL_PTR, 1);
3282 DECL_BUILT_IN_CLASS (decl) = class;
3283 DECL_FUNCTION_CODE (decl) = function_code;
3285 /* Warn if a function in the namespace for users
3286 is used without an occasion to consider it declared. */
3287 if (name[0] != '_' || name[1] != '_')
3288 C_DECL_ANTICIPATED (decl) = 1;
3293 /* Called when a declaration is seen that contains no names to declare.
3294 If its type is a reference to a structure, union or enum inherited
3295 from a containing scope, shadow that tag name for the current scope
3296 with a forward reference.
3297 If its type defines a new named structure or union
3298 or defines an enum, it is valid but we need not do anything here.
3299 Otherwise, it is an error. */
3302 shadow_tag (declspecs)
3305 shadow_tag_warned (declspecs, 0);
3309 shadow_tag_warned (declspecs, warned)
3312 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3319 pending_invalid_xref = 0;
3321 /* Remove the attributes from declspecs, since they will confuse the
3323 split_specs_attrs (declspecs, &specs, &attrs);
3325 for (link = specs; link; link = TREE_CHAIN (link))
3327 register tree value = TREE_VALUE (link);
3328 register enum tree_code code = TREE_CODE (value);
3330 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3331 /* Used to test also that TYPE_SIZE (value) != 0.
3332 That caused warning for `struct foo;' at top level in the file. */
3334 register tree name = lookup_tag_reverse (value);
3341 if (warned != 1 && code != ENUMERAL_TYPE)
3342 /* Empty unnamed enum OK */
3344 pedwarn ("unnamed struct/union that defines no instances");
3350 t = lookup_tag (code, name, current_binding_level, 1);
3354 t = make_node (code);
3361 if (!warned && ! in_system_header)
3363 warning ("useless keyword or type name in empty declaration");
3370 error ("two types specified in one empty declaration");
3375 pedwarn ("empty declaration");
3379 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3382 groktypename (typename)
3385 if (TREE_CODE (typename) != TREE_LIST)
3387 return grokdeclarator (TREE_VALUE (typename),
3388 TREE_PURPOSE (typename),
3392 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3395 groktypename_in_parm_context (typename)
3398 if (TREE_CODE (typename) != TREE_LIST)
3400 return grokdeclarator (TREE_VALUE (typename),
3401 TREE_PURPOSE (typename),
3405 /* Decode a declarator in an ordinary declaration or data definition.
3406 This is called as soon as the type information and variable name
3407 have been parsed, before parsing the initializer if any.
3408 Here we create the ..._DECL node, fill in its type,
3409 and put it on the list of decls for the current context.
3410 The ..._DECL node is returned as the value.
3412 Exception: for arrays where the length is not specified,
3413 the type is left null, to be filled in by `finish_decl'.
3415 Function definitions do not come here; they go to start_function
3416 instead. However, external and forward declarations of functions
3417 do go through here. Structure field declarations are done by
3418 grokfield and not through here. */
3421 start_decl (declarator, declspecs, initialized, attributes, prefix_attributes)
3422 tree declarator, declspecs;
3424 tree attributes, prefix_attributes;
3426 register tree decl = grokdeclarator (declarator, declspecs,
3427 NORMAL, initialized);
3430 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3431 && MAIN_NAME_P (DECL_NAME (decl)))
3432 warning_with_decl (decl, "`%s' is usually a function");
3435 /* Is it valid for this decl to have an initializer at all?
3436 If not, set INITIALIZED to zero, which will indirectly
3437 tell `finish_decl' to ignore the initializer once it is parsed. */
3438 switch (TREE_CODE (decl))
3441 /* typedef foo = bar means give foo the same type as bar.
3442 We haven't parsed bar yet, so `finish_decl' will fix that up.
3443 Any other case of an initialization in a TYPE_DECL is an error. */
3444 if (pedantic || list_length (declspecs) > 1)
3446 error ("typedef `%s' is initialized",
3447 IDENTIFIER_POINTER (DECL_NAME (decl)));
3453 error ("function `%s' is initialized like a variable",
3454 IDENTIFIER_POINTER (DECL_NAME (decl)));
3459 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3460 error ("parameter `%s' is initialized",
3461 IDENTIFIER_POINTER (DECL_NAME (decl)));
3466 /* Don't allow initializations for incomplete types
3467 except for arrays which might be completed by the initialization. */
3468 if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3470 /* A complete type is ok if size is fixed. */
3472 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3473 || C_DECL_VARIABLE_SIZE (decl))
3475 error ("variable-sized object may not be initialized");
3479 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3481 error ("variable `%s' has initializer but incomplete type",
3482 IDENTIFIER_POINTER (DECL_NAME (decl)));
3485 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
3487 error ("elements of array `%s' have incomplete type",
3488 IDENTIFIER_POINTER (DECL_NAME (decl)));
3496 /* Seems redundant with grokdeclarator. */
3497 if (current_binding_level != global_binding_level
3498 && DECL_EXTERNAL (decl)
3499 && TREE_CODE (decl) != FUNCTION_DECL)
3500 warning ("declaration of `%s' has `extern' and is initialized",
3501 IDENTIFIER_POINTER (DECL_NAME (decl)));
3503 DECL_EXTERNAL (decl) = 0;
3504 if (current_binding_level == global_binding_level)
3505 TREE_STATIC (decl) = 1;
3507 /* Tell `pushdecl' this is an initialized decl
3508 even though we don't yet have the initializer expression.
3509 Also tell `finish_decl' it may store the real initializer. */
3510 DECL_INITIAL (decl) = error_mark_node;
3513 /* If this is a function declaration, write a record describing it to the
3514 prototypes file (if requested). */
3516 if (TREE_CODE (decl) == FUNCTION_DECL)
3517 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3519 /* ANSI specifies that a tentative definition which is not merged with
3520 a non-tentative definition behaves exactly like a definition with an
3521 initializer equal to zero. (Section 3.7.2)
3522 -fno-common gives strict ANSI behavior. Usually you don't want it.
3523 This matters only for variables with external linkage. */
3524 if (! flag_no_common || ! TREE_PUBLIC (decl))
3525 DECL_COMMON (decl) = 1;
3527 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
3528 SET_DEFAULT_DECL_ATTRIBUTES (decl, attributes);
3531 /* Set attributes here so if duplicate decl, will have proper attributes. */
3532 decl_attributes (decl, attributes, prefix_attributes);
3534 /* Add this decl to the current binding level.
3535 TEM may equal DECL or it may be a previous decl of the same name. */
3536 tem = pushdecl (decl);
3538 /* For a local variable, define the RTL now. */
3539 if (current_binding_level != global_binding_level
3540 /* But not if this is a duplicate decl
3541 and we preserved the rtl from the previous one
3542 (which may or may not happen). */
3543 && DECL_RTL (tem) == 0)
3545 if (COMPLETE_TYPE_P (TREE_TYPE (tem)))
3547 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3548 && DECL_INITIAL (tem) != 0)
3555 /* Finish processing of a declaration;
3556 install its initial value.
3557 If the length of an array type is not known before,
3558 it must be determined now, from the initial value, or it is an error. */
3561 finish_decl (decl, init, asmspec_tree)
3565 register tree type = TREE_TYPE (decl);
3566 int was_incomplete = (DECL_SIZE (decl) == 0);
3569 /* If a name was specified, get the string. */
3571 asmspec = TREE_STRING_POINTER (asmspec_tree);
3573 /* If `start_decl' didn't like having an initialization, ignore it now. */
3575 if (init != 0 && DECL_INITIAL (decl) == 0)
3577 /* Don't crash if parm is initialized. */
3578 if (TREE_CODE (decl) == PARM_DECL)
3583 if (TREE_CODE (decl) != TYPE_DECL)
3584 store_init_value (decl, init);
3587 /* typedef foo = bar; store the type of bar as the type of foo. */
3588 TREE_TYPE (decl) = TREE_TYPE (init);
3589 DECL_INITIAL (decl) = init = 0;
3593 /* Deduce size of array from initialization, if not already known */
3595 if (TREE_CODE (type) == ARRAY_TYPE
3596 && TYPE_DOMAIN (type) == 0
3597 && TREE_CODE (decl) != TYPE_DECL)
3600 = (TREE_STATIC (decl)
3601 /* Even if pedantic, an external linkage array
3602 may have incomplete type at first. */
3603 ? pedantic && !TREE_PUBLIC (decl)
3604 : !DECL_EXTERNAL (decl));
3606 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3608 /* Get the completed type made by complete_array_type. */
3609 type = TREE_TYPE (decl);
3612 error_with_decl (decl, "initializer fails to determine size of `%s'");
3617 error_with_decl (decl, "array size missing in `%s'");
3618 /* If a `static' var's size isn't known,
3619 make it extern as well as static, so it does not get
3621 If it is not `static', then do not mark extern;
3622 finish_incomplete_decl will give it a default size
3623 and it will get allocated. */
3624 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3625 DECL_EXTERNAL (decl) = 1;
3628 /* TYPE_MAX_VALUE is always one less than the number of elements
3629 in the array, because we start counting at zero. Therefore,
3630 warn only if the value is less than zero. */
3631 if (pedantic && TYPE_DOMAIN (type) != 0
3632 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3633 error_with_decl (decl, "zero or negative size array `%s'");
3635 layout_decl (decl, 0);
3638 if (TREE_CODE (decl) == VAR_DECL)
3640 if (DECL_SIZE (decl) == 0 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3641 layout_decl (decl, 0);
3643 if (DECL_SIZE (decl) == 0
3644 && (TREE_STATIC (decl)
3646 /* A static variable with an incomplete type
3647 is an error if it is initialized.
3648 Also if it is not file scope.
3649 Otherwise, let it through, but if it is not `extern'
3650 then it may cause an error message later. */
3651 /* A duplicate_decls call could have changed an extern
3652 declaration into a file scope one. This can be detected
3653 by TREE_ASM_WRITTEN being set. */
3654 (DECL_INITIAL (decl) != 0
3655 || (DECL_CONTEXT (decl) != 0 && ! TREE_ASM_WRITTEN (decl)))
3657 /* An automatic variable with an incomplete type
3659 !DECL_EXTERNAL (decl)))
3661 error_with_decl (decl, "storage size of `%s' isn't known");
3662 TREE_TYPE (decl) = error_mark_node;
3665 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3666 && DECL_SIZE (decl) != 0)
3668 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3669 constant_expression_warning (DECL_SIZE (decl));
3671 error_with_decl (decl, "storage size of `%s' isn't constant");
3674 if (TREE_USED (type))
3675 TREE_USED (decl) = 1;
3678 /* If this is a function and an assembler name is specified, it isn't
3679 builtin any more. Also reset DECL_RTL so we can give it its new
3681 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3683 DECL_BUILT_IN_CLASS (decl) = NOT_BUILT_IN;
3684 DECL_RTL (decl) = 0;
3685 DECL_ASSEMBLER_NAME (decl) = get_identifier (asmspec);
3688 /* Output the assembler code and/or RTL code for variables and functions,
3689 unless the type is an undefined structure or union.
3690 If not, it will get done when the type is completed. */
3692 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3694 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3695 maybe_objc_check_decl (decl);
3696 rest_of_decl_compilation (decl, asmspec,
3697 (DECL_CONTEXT (decl) == 0
3698 || TREE_ASM_WRITTEN (decl)), 0);
3700 if (DECL_CONTEXT (decl) != 0)
3702 /* Recompute the RTL of a local array now
3703 if it used to be an incomplete type. */
3705 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3707 /* If we used it already as memory, it must stay in memory. */
3708 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3709 /* If it's still incomplete now, no init will save it. */
3710 if (DECL_SIZE (decl) == 0)
3711 DECL_INITIAL (decl) = 0;
3714 /* Compute and store the initial value. */
3715 if (TREE_CODE (decl) != FUNCTION_DECL)
3716 expand_decl_init (decl);
3720 if (TREE_CODE (decl) == TYPE_DECL)
3722 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3723 maybe_objc_check_decl (decl);
3724 rest_of_decl_compilation (decl, NULL_PTR, DECL_CONTEXT (decl) == 0, 0);
3727 /* At the end of a declaration, throw away any variable type sizes
3728 of types defined inside that declaration. There is no use
3729 computing them in the following function definition. */
3730 if (current_binding_level == global_binding_level)
3731 get_pending_sizes ();
3734 /* If DECL has a cleanup, build and return that cleanup here.
3735 This is a callback called by expand_expr. */
3738 maybe_build_cleanup (decl)
3739 tree decl ATTRIBUTE_UNUSED;
3741 /* There are no cleanups in C. */
3745 /* Given a parsed parameter declaration,
3746 decode it into a PARM_DECL and push that on the current binding level.
3747 Also, for the sake of forward parm decls,
3748 record the given order of parms in `parm_order'. */
3751 push_parm_decl (parm)
3755 int old_immediate_size_expand = immediate_size_expand;
3756 /* Don't try computing parm sizes now -- wait till fn is called. */
3757 immediate_size_expand = 0;
3759 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3760 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3761 decl_attributes (decl, TREE_VALUE (TREE_VALUE (parm)),
3762 TREE_PURPOSE (TREE_VALUE (parm)));
3765 if (DECL_NAME (decl))
3768 olddecl = lookup_name (DECL_NAME (decl));
3769 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3770 pedwarn_with_decl (decl,
3771 "ANSI C forbids parameter `%s' shadowing typedef");
3775 decl = pushdecl (decl);
3777 immediate_size_expand = old_immediate_size_expand;
3779 current_binding_level->parm_order
3780 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3782 /* Add this decl to the current binding level. */
3783 finish_decl (decl, NULL_TREE, NULL_TREE);
3786 /* Clear the given order of parms in `parm_order'.
3787 Used at start of parm list,
3788 and also at semicolon terminating forward decls. */
3793 current_binding_level->parm_order = NULL_TREE;
3796 /* Make TYPE a complete type based on INITIAL_VALUE.
3797 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3798 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3801 complete_array_type (type, initial_value, do_default)
3806 register tree maxindex = NULL_TREE;
3811 /* Note MAXINDEX is really the maximum index,
3812 one less than the size. */
3813 if (TREE_CODE (initial_value) == STRING_CST)
3816 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3817 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3820 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3822 tree elts = CONSTRUCTOR_ELTS (initial_value);
3823 maxindex = build_int_2 (-1, -1);
3824 for (; elts; elts = TREE_CHAIN (elts))
3826 if (TREE_PURPOSE (elts))
3827 maxindex = TREE_PURPOSE (elts);
3829 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3830 maxindex, integer_one_node));
3832 maxindex = copy_node (maxindex);
3836 /* Make an error message unless that happened already. */
3837 if (initial_value != error_mark_node)
3840 /* Prevent further error messages. */
3841 maxindex = build_int_2 (0, 0);
3848 maxindex = build_int_2 (0, 0);
3854 TYPE_DOMAIN (type) = build_index_type (maxindex);
3855 if (!TREE_TYPE (maxindex))
3856 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3859 /* Lay out the type now that we can get the real answer. */
3866 /* Given declspecs and a declarator,
3867 determine the name and type of the object declared
3868 and construct a ..._DECL node for it.
3869 (In one case we can return a ..._TYPE node instead.
3870 For invalid input we sometimes return 0.)
3872 DECLSPECS is a chain of tree_list nodes whose value fields
3873 are the storage classes and type specifiers.
3875 DECL_CONTEXT says which syntactic context this declaration is in:
3876 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3877 FUNCDEF for a function definition. Like NORMAL but a few different
3878 error messages in each case. Return value may be zero meaning
3879 this definition is too screwy to try to parse.
3880 PARM for a parameter declaration (either within a function prototype
3881 or before a function body). Make a PARM_DECL, or return void_type_node.
3882 TYPENAME if for a typename (in a cast or sizeof).
3883 Don't make a DECL node; just return the ..._TYPE node.
3884 FIELD for a struct or union field; make a FIELD_DECL.
3885 BITFIELD for a field with specified width.
3886 INITIALIZED is 1 if the decl has an initializer.
3888 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3889 It may also be so in the PARM case, for a prototype where the
3890 argument type is specified but not the name.
3892 This function is where the complicated C meanings of `static'
3893 and `extern' are interpreted. */
3896 grokdeclarator (declarator, declspecs, decl_context, initialized)
3899 enum decl_context decl_context;
3904 tree type = NULL_TREE;
3909 int type_quals = TYPE_UNQUALIFIED;
3911 int explicit_int = 0;
3912 int explicit_char = 0;
3913 int defaulted_int = 0;
3914 tree typedef_decl = 0;
3916 tree typedef_type = 0;
3917 int funcdef_flag = 0;
3918 enum tree_code innermost_code = ERROR_MARK;
3920 int size_varies = 0;
3921 tree decl_machine_attr = NULL_TREE;
3923 if (decl_context == BITFIELD)
3924 bitfield = 1, decl_context = FIELD;
3926 if (decl_context == FUNCDEF)
3927 funcdef_flag = 1, decl_context = NORMAL;
3929 /* Look inside a declarator for the name being declared
3930 and get it as a string, for an error message. */
3932 register tree decl = declarator;
3936 switch (TREE_CODE (decl))
3941 innermost_code = TREE_CODE (decl);
3942 decl = TREE_OPERAND (decl, 0);
3945 case IDENTIFIER_NODE:
3946 name = IDENTIFIER_POINTER (decl);
3957 /* A function definition's declarator must have the form of
3958 a function declarator. */
3960 if (funcdef_flag && innermost_code != CALL_EXPR)
3963 /* Anything declared one level down from the top level
3964 must be one of the parameters of a function
3965 (because the body is at least two levels down). */
3967 /* If this looks like a function definition, make it one,
3968 even if it occurs where parms are expected.
3969 Then store_parm_decls will reject it and not use it as a parm. */
3970 if (decl_context == NORMAL && !funcdef_flag
3971 && current_binding_level->parm_flag)
3972 decl_context = PARM;
3974 /* Look through the decl specs and record which ones appear.
3975 Some typespecs are defined as built-in typenames.
3976 Others, the ones that are modifiers of other types,
3977 are represented by bits in SPECBITS: set the bits for
3978 the modifiers that appear. Storage class keywords are also in SPECBITS.
3980 If there is a typedef name or a type, store the type in TYPE.
3981 This includes builtin typedefs such as `int'.
3983 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3984 and did not come from a user typedef.
3986 Set LONGLONG if `long' is mentioned twice. */
3988 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3991 register tree id = TREE_VALUE (spec);
3993 if (id == ridpointers[(int) RID_INT])
3995 if (id == ridpointers[(int) RID_CHAR])
3998 if (TREE_CODE (id) == IDENTIFIER_NODE)
3999 for (i = (int) RID_FIRST_MODIFIER; i < (int) RID_MAX; i++)
4001 if (ridpointers[i] == id)
4003 if (i == (int) RID_LONG && specbits & (1 << i))
4006 error ("`long long long' is too long for GCC");
4009 if (pedantic && !flag_isoc99 && ! in_system_header
4011 pedwarn ("ISO C89 does not support `long long'");
4015 else if (specbits & (1 << i))
4016 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
4022 error ("two or more data types in declaration of `%s'", name);
4023 /* Actual typedefs come to us as TYPE_DECL nodes. */
4024 else if (TREE_CODE (id) == TYPE_DECL)
4026 type = TREE_TYPE (id);
4027 decl_machine_attr = DECL_MACHINE_ATTRIBUTES (id);
4030 /* Built-in types come as identifiers. */
4031 else if (TREE_CODE (id) == IDENTIFIER_NODE)
4033 register tree t = lookup_name (id);
4034 if (TREE_TYPE (t) == error_mark_node)
4036 else if (!t || TREE_CODE (t) != TYPE_DECL)
4037 error ("`%s' fails to be a typedef or built in type",
4038 IDENTIFIER_POINTER (id));
4041 type = TREE_TYPE (t);
4045 else if (TREE_CODE (id) != ERROR_MARK)
4052 typedef_type = type;
4054 size_varies = C_TYPE_VARIABLE_SIZE (type);
4056 /* No type at all: default to `int', and set DEFAULTED_INT
4057 because it was not a user-defined typedef. */
4061 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4062 | (1 << (int) RID_SIGNED)
4063 | (1 << (int) RID_UNSIGNED))))
4064 /* Don't warn about typedef foo = bar. */
4065 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
4066 && ! in_system_header)
4068 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
4069 and this is a function, or if -Wimplicit; prefer the former
4070 warning since it is more explicit. */
4071 if ((warn_implicit_int || warn_return_type) && funcdef_flag)
4072 warn_about_return_type = 1;
4073 else if (warn_implicit_int || flag_isoc99)
4074 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
4079 type = integer_type_node;
4082 /* Now process the modifiers that were specified
4083 and check for invalid combinations. */
4085 /* Long double is a special combination. */
4087 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4088 && TYPE_MAIN_VARIANT (type) == double_type_node)
4090 specbits &= ~(1 << (int) RID_LONG);
4091 type = long_double_type_node;
4094 /* Check all other uses of type modifiers. */
4096 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4097 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4101 if ((specbits & 1 << (int) RID_LONG)
4102 && (specbits & 1 << (int) RID_SHORT))
4103 error ("both long and short specified for `%s'", name);
4104 else if (((specbits & 1 << (int) RID_LONG)
4105 || (specbits & 1 << (int) RID_SHORT))
4107 error ("long or short specified with char for `%s'", name);
4108 else if (((specbits & 1 << (int) RID_LONG)
4109 || (specbits & 1 << (int) RID_SHORT))
4110 && TREE_CODE (type) == REAL_TYPE)
4112 static int already = 0;
4114 error ("long or short specified with floating type for `%s'", name);
4115 if (! already && ! pedantic)
4117 error ("the only valid combination is `long double'");
4121 else if ((specbits & 1 << (int) RID_SIGNED)
4122 && (specbits & 1 << (int) RID_UNSIGNED))
4123 error ("both signed and unsigned specified for `%s'", name);
4124 else if (TREE_CODE (type) != INTEGER_TYPE)
4125 error ("long, short, signed or unsigned invalid for `%s'", name);
4129 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4131 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4133 if (flag_pedantic_errors)
4138 /* Discard the type modifiers if they are invalid. */
4141 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4142 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4147 if ((specbits & (1 << (int) RID_COMPLEX))
4148 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4150 error ("complex invalid for `%s'", name);
4151 specbits &= ~(1 << (int) RID_COMPLEX);
4154 /* Decide whether an integer type is signed or not.
4155 Optionally treat bitfields as signed by default. */
4156 if (specbits & 1 << (int) RID_UNSIGNED
4157 /* Traditionally, all bitfields are unsigned. */
4158 || (bitfield && flag_traditional
4159 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4160 || (bitfield && ! flag_signed_bitfields
4161 && (explicit_int || defaulted_int || explicit_char
4162 /* A typedef for plain `int' without `signed'
4163 can be controlled just like plain `int'. */
4164 || ! (typedef_decl != 0
4165 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4166 && TREE_CODE (type) != ENUMERAL_TYPE
4167 && !(specbits & 1 << (int) RID_SIGNED)))
4170 type = long_long_unsigned_type_node;
4171 else if (specbits & 1 << (int) RID_LONG)
4172 type = long_unsigned_type_node;
4173 else if (specbits & 1 << (int) RID_SHORT)
4174 type = short_unsigned_type_node;
4175 else if (type == char_type_node)
4176 type = unsigned_char_type_node;
4177 else if (typedef_decl)
4178 type = unsigned_type (type);
4180 type = unsigned_type_node;
4182 else if ((specbits & 1 << (int) RID_SIGNED)
4183 && type == char_type_node)
4184 type = signed_char_type_node;
4186 type = long_long_integer_type_node;
4187 else if (specbits & 1 << (int) RID_LONG)
4188 type = long_integer_type_node;
4189 else if (specbits & 1 << (int) RID_SHORT)
4190 type = short_integer_type_node;
4192 if (specbits & 1 << (int) RID_COMPLEX)
4194 /* If we just have "complex", it is equivalent to
4195 "complex double", but if any modifiers at all are specified it is
4196 the complex form of TYPE. E.g, "complex short" is
4197 "complex short int". */
4199 if (defaulted_int && ! longlong
4200 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4201 | (1 << (int) RID_SIGNED)
4202 | (1 << (int) RID_UNSIGNED))))
4203 type = complex_double_type_node;
4204 else if (type == integer_type_node)
4205 type = complex_integer_type_node;
4206 else if (type == float_type_node)
4207 type = complex_float_type_node;
4208 else if (type == double_type_node)
4209 type = complex_double_type_node;
4210 else if (type == long_double_type_node)
4211 type = complex_long_double_type_node;
4213 type = build_complex_type (type);
4216 /* Figure out the type qualifiers for the declaration. There are
4217 two ways a declaration can become qualified. One is something
4218 like `const int i' where the `const' is explicit. Another is
4219 something like `typedef const int CI; CI i' where the type of the
4220 declaration contains the `const'. */
4221 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4222 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
4223 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4224 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4225 if (constp > 1 && ! flag_isoc99)
4226 pedwarn ("duplicate `const'");
4227 if (restrictp > 1 && ! flag_isoc99)
4228 pedwarn ("duplicate `restrict'");
4229 if (volatilep > 1 && ! flag_isoc99)
4230 pedwarn ("duplicate `volatile'");
4231 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
4232 type = TYPE_MAIN_VARIANT (type);
4233 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4234 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4235 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4237 /* Warn if two storage classes are given. Default to `auto'. */
4242 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4243 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4244 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4245 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4246 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4248 /* Warn about storage classes that are invalid for certain
4249 kinds of declarations (parameters, typenames, etc.). */
4252 error ("multiple storage classes in declaration of `%s'", name);
4253 else if (funcdef_flag
4255 & ((1 << (int) RID_REGISTER)
4256 | (1 << (int) RID_AUTO)
4257 | (1 << (int) RID_TYPEDEF))))
4259 if (specbits & 1 << (int) RID_AUTO
4260 && (pedantic || current_binding_level == global_binding_level))
4261 pedwarn ("function definition declared `auto'");
4262 if (specbits & 1 << (int) RID_REGISTER)
4263 error ("function definition declared `register'");
4264 if (specbits & 1 << (int) RID_TYPEDEF)
4265 error ("function definition declared `typedef'");
4266 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4267 | (1 << (int) RID_AUTO));
4269 else if (decl_context != NORMAL && nclasses > 0)
4271 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4275 switch (decl_context)
4278 error ("storage class specified for structure field `%s'",
4282 error ("storage class specified for parameter `%s'", name);
4285 error ("storage class specified for typename");
4288 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4289 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4290 | (1 << (int) RID_EXTERN));
4293 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4295 /* `extern' with initialization is invalid if not at top level. */
4296 if (current_binding_level == global_binding_level)
4297 warning ("`%s' initialized and declared `extern'", name);
4299 error ("`%s' has both `extern' and initializer", name);
4301 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4302 && current_binding_level != global_binding_level)
4303 error ("nested function `%s' declared `extern'", name);
4304 else if (current_binding_level == global_binding_level
4305 && specbits & (1 << (int) RID_AUTO))
4306 error ("top-level declaration of `%s' specifies `auto'", name);
4309 /* Now figure out the structure of the declarator proper.
4310 Descend through it, creating more complex types, until we reach
4311 the declared identifier (or NULL_TREE, in an absolute declarator). */
4313 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4315 if (type == error_mark_node)
4317 declarator = TREE_OPERAND (declarator, 0);
4321 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4322 an INDIRECT_REF (for *...),
4323 a CALL_EXPR (for ...(...)),
4324 an identifier (for the name being declared)
4325 or a null pointer (for the place in an absolute declarator
4326 where the name was omitted).
4327 For the last two cases, we have just exited the loop.
4329 At this point, TYPE is the type of elements of an array,
4330 or for a function to return, or for a pointer to point to.
4331 After this sequence of ifs, TYPE is the type of the
4332 array or function or pointer, and DECLARATOR has had its
4333 outermost layer removed. */
4335 if (TREE_CODE (declarator) == ARRAY_REF)
4337 register tree itype = NULL_TREE;
4338 register tree size = TREE_OPERAND (declarator, 1);
4339 /* The index is a signed object `sizetype' bits wide. */
4340 tree index_type = signed_type (sizetype);
4342 declarator = TREE_OPERAND (declarator, 0);
4344 /* Check for some types that there cannot be arrays of. */
4346 if (VOID_TYPE_P (type))
4348 error ("declaration of `%s' as array of voids", name);
4349 type = error_mark_node;
4352 if (TREE_CODE (type) == FUNCTION_TYPE)
4354 error ("declaration of `%s' as array of functions", name);
4355 type = error_mark_node;
4358 if (size == error_mark_node)
4359 type = error_mark_node;
4361 if (type == error_mark_node)
4364 /* If size was specified, set ITYPE to a range-type for that size.
4365 Otherwise, ITYPE remains null. finish_decl may figure it out
4366 from an initial value. */
4370 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4371 STRIP_TYPE_NOPS (size);
4373 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
4374 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
4376 error ("size of array `%s' has non-integer type", name);
4377 size = integer_one_node;
4380 if (pedantic && integer_zerop (size))
4381 pedwarn ("ISO C forbids zero-size array `%s'", name);
4383 if (TREE_CODE (size) == INTEGER_CST)
4385 constant_expression_warning (size);
4386 if (tree_int_cst_sgn (size) < 0)
4388 error ("size of array `%s' is negative", name);
4389 size = integer_one_node;
4394 /* Make sure the array size remains visibly nonconstant
4395 even if it is (eg) a const variable with known value. */
4400 if (TREE_CONSTANT (size))
4401 pedwarn ("ISO C89 forbids array `%s' whose size can't be evaluated",
4404 pedwarn ("ISO C89 forbids variable-size array `%s'",
4409 /* Convert size to index_type, so that if it is a variable
4410 the computations will be done in the proper mode. */
4411 itype = fold (build (MINUS_EXPR, index_type,
4412 convert (index_type, size),
4413 convert (index_type, size_one_node)));
4415 /* If that overflowed, the array is too big.
4416 ??? While a size of INT_MAX+1 technically shouldn't cause
4417 an overflow (because we subtract 1), the overflow is recorded
4418 during the conversion to index_type, before the subtraction.
4419 Handling this case seems like an unnecessary complication. */
4420 if (TREE_OVERFLOW (itype))
4422 error ("size of array `%s' is too large", name);
4423 type = error_mark_node;
4428 itype = variable_size (itype);
4429 itype = build_index_type (itype);
4433 /* This had bad results for pointers to arrays, as in
4434 union incomplete (*foo)[4]; */
4435 /* Complain about arrays of incomplete types, except in typedefs. */
4437 if (!COMPLETE_TYPE_P (type)
4438 /* Avoid multiple warnings for nested array types. */
4439 && TREE_CODE (type) != ARRAY_TYPE
4440 && !(specbits & (1 << (int) RID_TYPEDEF))
4441 && !C_TYPE_BEING_DEFINED (type))
4442 warning ("array type has incomplete element type");
4446 /* We shouldn't have a function type here at all!
4447 Functions aren't allowed as array elements. */
4448 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4449 && (constp || volatilep))
4450 pedwarn ("ANSI C forbids const or volatile function types");
4453 /* Build the array type itself, then merge any constancy or
4454 volatility into the target type. We must do it in this order
4455 to ensure that the TYPE_MAIN_VARIANT field of the array type
4456 is set correctly. */
4458 type = build_array_type (type, itype);
4460 type = c_build_qualified_type (type, type_quals);
4463 /* Don't clear these; leave them set so that the array type
4464 or the variable is itself const or volatile. */
4465 type_quals = TYPE_UNQUALIFIED;
4469 C_TYPE_VARIABLE_SIZE (type) = 1;
4471 else if (TREE_CODE (declarator) == CALL_EXPR)
4475 /* Declaring a function type.
4476 Make sure we have a valid type for the function to return. */
4477 if (type == error_mark_node)
4482 /* Warn about some types functions can't return. */
4484 if (TREE_CODE (type) == FUNCTION_TYPE)
4486 error ("`%s' declared as function returning a function", name);
4487 type = integer_type_node;
4489 if (TREE_CODE (type) == ARRAY_TYPE)
4491 error ("`%s' declared as function returning an array", name);
4492 type = integer_type_node;
4495 #ifndef TRADITIONAL_RETURN_FLOAT
4496 /* Traditionally, declaring return type float means double. */
4498 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4499 type = double_type_node;
4500 #endif /* TRADITIONAL_RETURN_FLOAT */
4502 /* Construct the function type and go to the next
4503 inner layer of declarator. */
4505 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4507 /* Say it's a definition
4508 only for the CALL_EXPR
4509 closest to the identifier. */
4510 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4511 /* Type qualifiers before the return type of the function
4512 qualify the return type, not the function type. */
4514 type = c_build_qualified_type (type, type_quals);
4515 type_quals = TYPE_UNQUALIFIED;
4517 type = build_function_type (type, arg_types);
4518 declarator = TREE_OPERAND (declarator, 0);
4520 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4521 the formal parameter list of this FUNCTION_TYPE to point to
4522 the FUNCTION_TYPE node itself. */
4527 for (link = last_function_parm_tags;
4529 link = TREE_CHAIN (link))
4530 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4533 else if (TREE_CODE (declarator) == INDIRECT_REF)
4535 /* Merge any constancy or volatility into the target type
4538 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4540 pedwarn ("ISO C forbids qualified function types");
4542 type = c_build_qualified_type (type, type_quals);
4543 type_quals = TYPE_UNQUALIFIED;
4546 type = build_pointer_type (type);
4548 /* Process a list of type modifier keywords
4549 (such as const or volatile) that were given inside the `*'. */
4551 if (TREE_TYPE (declarator))
4553 register tree typemodlist;
4559 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4560 typemodlist = TREE_CHAIN (typemodlist))
4562 tree qualifier = TREE_VALUE (typemodlist);
4564 if (qualifier == ridpointers[(int) RID_CONST])
4566 else if (qualifier == ridpointers[(int) RID_VOLATILE])
4568 else if (qualifier == ridpointers[(int) RID_RESTRICT])
4573 error ("invalid type modifier within pointer declarator");
4576 if (constp > 1 && ! flag_isoc99)
4577 pedwarn ("duplicate `const'");
4578 if (volatilep > 1 && ! flag_isoc99)
4579 pedwarn ("duplicate `volatile'");
4580 if (restrictp > 1 && ! flag_isoc99)
4581 pedwarn ("duplicate `restrict'");
4583 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4584 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4585 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4588 declarator = TREE_OPERAND (declarator, 0);
4595 /* Now TYPE has the actual type. */
4597 /* Did array size calculations overflow? */
4599 if (TREE_CODE (type) == ARRAY_TYPE
4600 && COMPLETE_TYPE_P (type)
4601 && TREE_OVERFLOW (TYPE_SIZE (type)))
4602 error ("size of array `%s' is too large", name);
4604 /* If this is declaring a typedef name, return a TYPE_DECL. */
4606 if (specbits & (1 << (int) RID_TYPEDEF))
4609 /* Note that the grammar rejects storage classes
4610 in typenames, fields or parameters */
4611 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4613 pedwarn ("ISO C forbids qualified function types");
4615 type = c_build_qualified_type (type, type_quals);
4616 decl = build_decl (TYPE_DECL, declarator, type);
4617 if ((specbits & (1 << (int) RID_SIGNED))
4618 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4619 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4623 /* Detect the case of an array type of unspecified size
4624 which came, as such, direct from a typedef name.
4625 We must copy the type, so that each identifier gets
4626 a distinct type, so that each identifier's size can be
4627 controlled separately by its own initializer. */
4629 if (type != 0 && typedef_type != 0
4630 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type)
4631 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0)
4633 type = build_array_type (TREE_TYPE (type), 0);
4635 C_TYPE_VARIABLE_SIZE (type) = 1;
4638 /* If this is a type name (such as, in a cast or sizeof),
4639 compute the type and return it now. */
4641 if (decl_context == TYPENAME)
4643 /* Note that the grammar rejects storage classes
4644 in typenames, fields or parameters */
4645 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4647 pedwarn ("ISO C forbids const or volatile function types");
4649 type = c_build_qualified_type (type, type_quals);
4653 /* Aside from typedefs and type names (handle above),
4654 `void' at top level (not within pointer)
4655 is allowed only in public variables.
4656 We don't complain about parms either, but that is because
4657 a better error message can be made later. */
4659 if (VOID_TYPE_P (type) && decl_context != PARM
4660 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4661 && ((specbits & (1 << (int) RID_EXTERN))
4662 || (current_binding_level == global_binding_level
4664 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4666 error ("variable or field `%s' declared void", name);
4667 type = integer_type_node;
4670 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4671 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4676 if (decl_context == PARM)
4678 tree type_as_written = type;
4681 /* A parameter declared as an array of T is really a pointer to T.
4682 One declared as a function is really a pointer to a function. */
4684 if (TREE_CODE (type) == ARRAY_TYPE)
4686 /* Transfer const-ness of array into that of type pointed to. */
4687 type = TREE_TYPE (type);
4689 type = c_build_qualified_type (type, type_quals);
4690 type = build_pointer_type (type);
4691 type_quals = TYPE_UNQUALIFIED;
4694 else if (TREE_CODE (type) == FUNCTION_TYPE)
4696 if (pedantic && type_quals)
4697 pedwarn ("ISO C forbids qualified function types");
4699 type = c_build_qualified_type (type, type_quals);
4700 type = build_pointer_type (type);
4701 type_quals = TYPE_UNQUALIFIED;
4704 decl = build_decl (PARM_DECL, declarator, type);
4706 C_DECL_VARIABLE_SIZE (decl) = 1;
4708 /* Compute the type actually passed in the parmlist,
4709 for the case where there is no prototype.
4710 (For example, shorts and chars are passed as ints.)
4711 When there is a prototype, this is overridden later. */
4713 if (type == error_mark_node)
4714 promoted_type = type;
4717 promoted_type = simple_type_promotes_to (type);
4718 if (! promoted_type)
4719 promoted_type = type;
4722 DECL_ARG_TYPE (decl) = promoted_type;
4723 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4725 else if (decl_context == FIELD)
4727 /* Structure field. It may not be a function. */
4729 if (TREE_CODE (type) == FUNCTION_TYPE)
4731 error ("field `%s' declared as a function", name);
4732 type = build_pointer_type (type);
4734 else if (TREE_CODE (type) != ERROR_MARK
4735 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4737 error ("field `%s' has incomplete type", name);
4738 type = error_mark_node;
4740 /* Move type qualifiers down to element of an array. */
4741 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4743 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4745 TYPE_DOMAIN (type));
4747 /* Leave the field const or volatile as well. */
4748 type_quals = TYPE_UNQUALIFIED;
4751 decl = build_decl (FIELD_DECL, declarator, type);
4752 DECL_NONADDRESSABLE_P (decl) = bitfield;
4755 C_DECL_VARIABLE_SIZE (decl) = 1;
4757 else if (TREE_CODE (type) == FUNCTION_TYPE)
4759 /* Every function declaration is "external"
4760 except for those which are inside a function body
4761 in which `auto' is used.
4762 That is a case not specified by ANSI C,
4763 and we use it for forward declarations for nested functions. */
4764 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4765 || current_binding_level == global_binding_level);
4767 if (specbits & (1 << (int) RID_AUTO)
4768 && (pedantic || current_binding_level == global_binding_level))
4769 pedwarn ("invalid storage class for function `%s'", name);
4770 if (specbits & (1 << (int) RID_REGISTER))
4771 error ("invalid storage class for function `%s'", name);
4772 /* Function declaration not at top level.
4773 Storage classes other than `extern' are not allowed
4774 and `extern' makes no difference. */
4775 if (current_binding_level != global_binding_level
4776 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4778 pedwarn ("invalid storage class for function `%s'", name);
4780 decl = build_decl (FUNCTION_DECL, declarator, type);
4781 decl = build_decl_attribute_variant (decl, decl_machine_attr);
4783 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4784 pedwarn ("ISO C forbids qualified function types");
4787 && VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl)))
4788 && TYPE_QUALS (TREE_TYPE (TREE_TYPE (decl)))
4789 && ! DECL_IN_SYSTEM_HEADER (decl))
4790 pedwarn ("ISO C forbids qualified void function return type");
4792 /* GNU C interprets a `volatile void' return type to indicate
4793 that the function does not return. */
4794 if ((type_quals & TYPE_QUAL_VOLATILE)
4795 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4796 warning ("`noreturn' function returns non-void value");
4799 DECL_EXTERNAL (decl) = 1;
4800 /* Record absence of global scope for `static' or `auto'. */
4802 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4804 /* Record presence of `inline', if it is reasonable. */
4807 if (MAIN_NAME_P (declarator))
4808 warning ("cannot inline function `main'");
4810 /* Assume that otherwise the function can be inlined. */
4811 DECL_INLINE (decl) = 1;
4813 if (specbits & (1 << (int) RID_EXTERN))
4814 current_extern_inline = 1;
4819 /* It's a variable. */
4820 /* An uninitialized decl with `extern' is a reference. */
4821 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4823 /* Move type qualifiers down to element of an array. */
4824 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4826 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4828 TYPE_DOMAIN (type));
4829 #if 0 /* Leave the variable const or volatile as well. */
4830 type_quals = TYPE_UNQUALIFIED;
4834 decl = build_decl (VAR_DECL, declarator, type);
4836 C_DECL_VARIABLE_SIZE (decl) = 1;
4839 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4841 DECL_EXTERNAL (decl) = extern_ref;
4842 /* At top level, the presence of a `static' or `register' storage
4843 class specifier, or the absence of all storage class specifiers
4844 makes this declaration a definition (perhaps tentative). Also,
4845 the absence of both `static' and `register' makes it public. */
4846 if (current_binding_level == global_binding_level)
4850 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
4851 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
4853 /* Not at top level, only `static' makes a static definition. */
4856 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4857 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
4861 /* Record `register' declaration for warnings on &
4862 and in case doing stupid register allocation. */
4864 if (specbits & (1 << (int) RID_REGISTER))
4865 DECL_REGISTER (decl) = 1;
4867 /* Record constancy and volatility. */
4868 c_apply_type_quals_to_decl (type_quals, decl);
4870 /* If a type has volatile components, it should be stored in memory.
4871 Otherwise, the fact that those components are volatile
4872 will be ignored, and would even crash the compiler. */
4873 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4874 mark_addressable (decl);
4880 /* Decode the parameter-list info for a function type or function definition.
4881 The argument is the value returned by `get_parm_info' (or made in parse.y
4882 if there is an identifier list instead of a parameter decl list).
4883 These two functions are separate because when a function returns
4884 or receives functions then each is called multiple times but the order
4885 of calls is different. The last call to `grokparms' is always the one
4886 that contains the formal parameter names of a function definition.
4888 Store in `last_function_parms' a chain of the decls of parms.
4889 Also store in `last_function_parm_tags' a chain of the struct, union,
4890 and enum tags declared among the parms.
4892 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4894 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4895 a mere declaration. A nonempty identifier-list gets an error message
4896 when FUNCDEF_FLAG is zero. */
4899 grokparms (parms_info, funcdef_flag)
4903 tree first_parm = TREE_CHAIN (parms_info);
4905 last_function_parms = TREE_PURPOSE (parms_info);
4906 last_function_parm_tags = TREE_VALUE (parms_info);
4908 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
4909 && !in_system_header)
4910 warning ("function declaration isn't a prototype");
4913 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
4916 pedwarn ("parameter names (without types) in function declaration");
4918 last_function_parms = first_parm;
4925 /* We no longer test FUNCDEF_FLAG.
4926 If the arg types are incomplete in a declaration,
4927 they must include undefined tags.
4928 These tags can never be defined in the scope of the declaration,
4929 so the types can never be completed,
4930 and no call can be compiled successfully. */
4932 /* In a fcn definition, arg types must be complete. */
4935 for (parm = last_function_parms, typelt = first_parm;
4937 parm = TREE_CHAIN (parm))
4938 /* Skip over any enumeration constants declared here. */
4939 if (TREE_CODE (parm) == PARM_DECL)
4941 /* Barf if the parameter itself has an incomplete type. */
4942 tree type = TREE_VALUE (typelt);
4943 if (!COMPLETE_TYPE_P (type))
4945 if (funcdef_flag && DECL_NAME (parm) != 0)
4946 error ("parameter `%s' has incomplete type",
4947 IDENTIFIER_POINTER (DECL_NAME (parm)));
4949 warning ("parameter has incomplete type");
4952 TREE_VALUE (typelt) = error_mark_node;
4953 TREE_TYPE (parm) = error_mark_node;
4957 /* This has been replaced by parm_tags_warning, which
4958 uses a more accurate criterion for what to warn
4962 /* Now warn if is a pointer to an incomplete type. */
4963 while (TREE_CODE (type) == POINTER_TYPE
4964 || TREE_CODE (type) == REFERENCE_TYPE)
4965 type = TREE_TYPE (type);
4966 type = TYPE_MAIN_VARIANT (type);
4967 if (!COMPLETE_TYPE_P (type))
4969 if (DECL_NAME (parm) != 0)
4970 warning ("parameter `%s' points to incomplete type",
4971 IDENTIFIER_POINTER (DECL_NAME (parm)));
4973 warning ("parameter points to incomplete type");
4977 typelt = TREE_CHAIN (typelt);
4984 /* Return a tree_list node with info on a parameter list just parsed.
4985 The TREE_PURPOSE is a chain of decls of those parms.
4986 The TREE_VALUE is a list of structure, union and enum tags defined.
4987 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
4988 This tree_list node is later fed to `grokparms'.
4990 VOID_AT_END nonzero means append `void' to the end of the type-list.
4991 Zero means the parmlist ended with an ellipsis so don't append `void'. */
4994 get_parm_info (void_at_end)
4997 register tree decl, t;
4998 register tree types = 0;
5000 tree tags = gettags ();
5001 tree parms = getdecls ();
5003 tree order = current_binding_level->parm_order;
5005 /* Just `void' (and no ellipsis) is special. There are really no parms.
5006 But if the `void' is qualified (by `const' or `volatile') or has a
5007 storage class specifier (`register'), then the behavior is undefined;
5008 by not counting it as the special case of `void' we will cause an
5009 error later. Typedefs for `void' are OK (see DR#157). */
5010 if (void_at_end && parms != 0
5011 && TREE_CHAIN (parms) == 0
5012 && VOID_TYPE_P (TREE_TYPE (parms))
5013 && ! TREE_THIS_VOLATILE (parms)
5014 && ! TREE_READONLY (parms)
5015 && ! DECL_REGISTER (parms)
5016 && DECL_NAME (parms) == 0)
5019 storedecls (NULL_TREE);
5020 return tree_cons (NULL_TREE, NULL_TREE,
5021 tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5024 /* Extract enumerator values and other non-parms declared with the parms.
5025 Likewise any forward parm decls that didn't have real parm decls. */
5026 for (decl = parms; decl;)
5028 tree next = TREE_CHAIN (decl);
5030 if (TREE_CODE (decl) != PARM_DECL)
5032 TREE_CHAIN (decl) = new_parms;
5035 else if (TREE_ASM_WRITTEN (decl))
5037 error_with_decl (decl,
5038 "parameter `%s' has just a forward declaration");
5039 TREE_CHAIN (decl) = new_parms;
5045 /* Put the parm decls back in the order they were in in the parm list. */
5046 for (t = order; t; t = TREE_CHAIN (t))
5049 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5051 TREE_CHAIN (TREE_VALUE (t)) = 0;
5054 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5057 /* Store the parmlist in the binding level since the old one
5058 is no longer a valid list. (We have changed the chain pointers.) */
5059 storedecls (new_parms);
5061 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5062 /* There may also be declarations for enumerators if an enumeration
5063 type is declared among the parms. Ignore them here. */
5064 if (TREE_CODE (decl) == PARM_DECL)
5066 /* Since there is a prototype,
5067 args are passed in their declared types. */
5068 tree type = TREE_TYPE (decl);
5069 DECL_ARG_TYPE (decl) = type;
5070 if (PROMOTE_PROTOTYPES
5071 && (TREE_CODE (type) == INTEGER_TYPE
5072 || TREE_CODE (type) == ENUMERAL_TYPE)
5073 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5074 DECL_ARG_TYPE (decl) = integer_type_node;
5076 types = tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5077 if (VOID_TYPE_P (TREE_VALUE (types)) && ! erred
5078 && DECL_NAME (decl) == 0)
5080 error ("`void' in parameter list must be the entire list");
5086 return tree_cons (new_parms, tags,
5087 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
5089 return tree_cons (new_parms, tags, nreverse (types));
5092 /* At end of parameter list, warn about any struct, union or enum tags
5093 defined within. Do so because these types cannot ever become complete. */
5096 parmlist_tags_warning ()
5101 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5103 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5104 /* An anonymous union parm type is meaningful as a GNU extension.
5105 So don't warn for that. */
5106 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5108 if (TREE_PURPOSE (elt) != 0)
5109 warning ("`%s %s' declared inside parameter list",
5110 (code == RECORD_TYPE ? "struct"
5111 : code == UNION_TYPE ? "union"
5113 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5116 /* For translation these need to be seperate warnings */
5117 if (code == RECORD_TYPE)
5118 warning ("anonymous struct declared inside parameter list");
5119 else if (code == UNION_TYPE)
5120 warning ("anonymous union declared inside parameter list");
5122 warning ("anonymous enum declared inside parameter list");
5126 warning ("its scope is only this definition or declaration, which is probably not what you want.");
5132 /* Get the struct, enum or union (CODE says which) with tag NAME.
5133 Define the tag as a forward-reference if it is not defined. */
5136 xref_tag (code, name)
5137 enum tree_code code;
5140 /* If a cross reference is requested, look up the type
5141 already defined for this tag and return it. */
5143 register tree ref = lookup_tag (code, name, current_binding_level, 0);
5144 /* Even if this is the wrong type of tag, return what we found.
5145 There will be an error message anyway, from pending_xref_error.
5146 If we create an empty xref just for an invalid use of the type,
5147 the main result is to create lots of superfluous error messages. */
5151 /* If no such tag is yet defined, create a forward-reference node
5152 and record it as the "definition".
5153 When a real declaration of this type is found,
5154 the forward-reference will be altered into a real type. */
5156 ref = make_node (code);
5157 if (code == ENUMERAL_TYPE)
5159 /* (In ANSI, Enums can be referred to only if already defined.) */
5161 pedwarn ("ISO C forbids forward references to `enum' types");
5162 /* Give the type a default layout like unsigned int
5163 to avoid crashing if it does not get defined. */
5164 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5165 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5166 TYPE_USER_ALIGN (ref) = 0;
5167 TREE_UNSIGNED (ref) = 1;
5168 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5169 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5170 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5173 pushtag (name, ref);
5178 /* Make sure that the tag NAME is defined *in the current binding level*
5179 at least as a forward reference.
5180 CODE says which kind of tag NAME ought to be. */
5183 start_struct (code, name)
5184 enum tree_code code;
5187 /* If there is already a tag defined at this binding level
5188 (as a forward reference), just return it. */
5190 register tree ref = 0;
5193 ref = lookup_tag (code, name, current_binding_level, 1);
5194 if (ref && TREE_CODE (ref) == code)
5196 C_TYPE_BEING_DEFINED (ref) = 1;
5197 TYPE_PACKED (ref) = flag_pack_struct;
5198 if (TYPE_FIELDS (ref))
5199 error ("redefinition of `%s %s'",
5200 code == UNION_TYPE ? "union" : "struct",
5201 IDENTIFIER_POINTER (name));
5206 /* Otherwise create a forward-reference just so the tag is in scope. */
5208 ref = make_node (code);
5209 pushtag (name, ref);
5210 C_TYPE_BEING_DEFINED (ref) = 1;
5211 TYPE_PACKED (ref) = flag_pack_struct;
5215 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5216 of a structure component, returning a FIELD_DECL node.
5217 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5219 This is done during the parsing of the struct declaration.
5220 The FIELD_DECL nodes are chained together and the lot of them
5221 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5224 grokfield (filename, line, declarator, declspecs, width)
5225 const char *filename ATTRIBUTE_UNUSED;
5226 int line ATTRIBUTE_UNUSED;
5227 tree declarator, declspecs, width;
5231 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5233 finish_decl (value, NULL_TREE, NULL_TREE);
5234 DECL_INITIAL (value) = width;
5236 maybe_objc_check_decl (value);
5240 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5241 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5242 ATTRIBUTES are attributes to be applied to the structure. */
5245 finish_struct (t, fieldlist, attributes)
5251 int toplevel = global_binding_level == current_binding_level;
5253 /* If this type was previously laid out as a forward reference,
5254 make sure we lay it out again. */
5258 decl_attributes (t, attributes, NULL_TREE);
5260 /* Nameless union parm types are useful as GCC extension. */
5261 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5262 /* Otherwise, warn about any struct or union def. in parmlist. */
5263 if (in_parm_level_p ())
5266 pedwarn ("%s defined inside parms",
5267 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5268 else if (! flag_traditional)
5269 warning ("%s defined inside parms",
5270 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5275 for (x = fieldlist; x; x = TREE_CHAIN (x))
5276 if (DECL_NAME (x) != 0)
5280 pedwarn ("%s has no %s",
5281 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
5282 fieldlist ? _("named members") : _("members"));
5285 /* Install struct as DECL_CONTEXT of each field decl.
5286 Also process specified field sizes,m which is found in the DECL_INITIAL.
5287 Store 0 there, except for ": 0" fields (so we can find them
5288 and delete them, below). */
5290 for (x = fieldlist; x; x = TREE_CHAIN (x))
5292 DECL_CONTEXT (x) = t;
5293 DECL_PACKED (x) |= TYPE_PACKED (t);
5295 /* If any field is const, the structure type is pseudo-const. */
5296 if (TREE_READONLY (x))
5297 C_TYPE_FIELDS_READONLY (t) = 1;
5300 /* A field that is pseudo-const makes the structure likewise. */
5301 tree t1 = TREE_TYPE (x);
5302 while (TREE_CODE (t1) == ARRAY_TYPE)
5303 t1 = TREE_TYPE (t1);
5304 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5305 && C_TYPE_FIELDS_READONLY (t1))
5306 C_TYPE_FIELDS_READONLY (t) = 1;
5309 /* Any field that is volatile means variables of this type must be
5310 treated in some ways as volatile. */
5311 if (TREE_THIS_VOLATILE (x))
5312 C_TYPE_FIELDS_VOLATILE (t) = 1;
5314 /* Any field of nominal variable size implies structure is too. */
5315 if (C_DECL_VARIABLE_SIZE (x))
5316 C_TYPE_VARIABLE_SIZE (t) = 1;
5318 /* Detect invalid nested redefinition. */
5319 if (TREE_TYPE (x) == t)
5320 error ("nested redefinition of `%s'",
5321 IDENTIFIER_POINTER (TYPE_NAME (t)));
5323 /* Detect invalid bit-field size. */
5324 if (DECL_INITIAL (x))
5325 STRIP_NOPS (DECL_INITIAL (x));
5326 if (DECL_INITIAL (x))
5328 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5329 constant_expression_warning (DECL_INITIAL (x));
5333 "bit-field `%s' width not an integer constant");
5334 DECL_INITIAL (x) = NULL;
5338 /* Detect invalid bit-field type. */
5339 if (DECL_INITIAL (x)
5340 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5341 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5343 error_with_decl (x, "bit-field `%s' has invalid type");
5344 DECL_INITIAL (x) = NULL;
5347 if (DECL_INITIAL (x) && pedantic
5348 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5349 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5350 /* Accept an enum that's equivalent to int or unsigned int. */
5351 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5352 && (TYPE_PRECISION (TREE_TYPE (x))
5353 == TYPE_PRECISION (integer_type_node))))
5354 pedwarn_with_decl (x, "bit-field `%s' type invalid in ISO C");
5356 /* Detect and ignore out of range field width and process valid
5358 if (DECL_INITIAL (x))
5360 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5361 error_with_decl (x, "negative width in bit-field `%s'");
5362 else if (0 < compare_tree_int (DECL_INITIAL (x),
5363 TYPE_PRECISION (TREE_TYPE (x))))
5364 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5365 else if (integer_zerop (DECL_INITIAL (x)) && DECL_NAME (x) != 0)
5366 error_with_decl (x, "zero width for bit-field `%s'");
5369 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
5370 unsigned HOST_WIDE_INT width
5371 = TREE_INT_CST_LOW (DECL_INITIAL (x));
5373 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5374 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5375 TREE_UNSIGNED (TREE_TYPE (x)))
5377 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5378 TREE_UNSIGNED (TREE_TYPE (x))))))
5379 warning_with_decl (x,
5380 "`%s' is narrower than values of its type");
5382 DECL_SIZE (x) = bitsize_int (width);
5383 DECL_BIT_FIELD (x) = DECL_C_BIT_FIELD (x) = 1;
5387 /* field size 0 => force desired amount of alignment. */
5388 #ifdef EMPTY_FIELD_BOUNDARY
5389 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5391 #ifdef PCC_BITFIELD_TYPE_MATTERS
5392 if (PCC_BITFIELD_TYPE_MATTERS)
5394 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5395 TYPE_ALIGN (TREE_TYPE (x)));
5396 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5403 else if (TREE_TYPE (x) != error_mark_node)
5405 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5406 : TYPE_ALIGN (TREE_TYPE (x)));
5408 /* Non-bit-fields are aligned for their type, except packed
5409 fields which require only BITS_PER_UNIT alignment. */
5410 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5411 if (! DECL_PACKED (x))
5412 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5415 DECL_INITIAL (x) = 0;
5418 /* Delete all duplicate fields from the fieldlist */
5419 for (x = fieldlist; x && TREE_CHAIN (x);)
5420 /* Anonymous fields aren't duplicates. */
5421 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5425 register tree y = fieldlist;
5429 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5435 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5437 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5438 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5444 /* Now we have the nearly final fieldlist. Record it,
5445 then lay out the structure or union (including the fields). */
5447 TYPE_FIELDS (t) = fieldlist;
5451 /* Delete all zero-width bit-fields from the fieldlist */
5453 tree *fieldlistp = &fieldlist;
5455 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5456 *fieldlistp = TREE_CHAIN (*fieldlistp);
5458 fieldlistp = &TREE_CHAIN (*fieldlistp);
5461 /* Now we have the truly final field list.
5462 Store it in this type and in the variants. */
5464 TYPE_FIELDS (t) = fieldlist;
5466 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5468 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5469 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5470 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5471 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5474 /* If this was supposed to be a transparent union, but we can't
5475 make it one, warn and turn off the flag. */
5476 if (TREE_CODE (t) == UNION_TYPE
5477 && TYPE_TRANSPARENT_UNION (t)
5478 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5480 TYPE_TRANSPARENT_UNION (t) = 0;
5481 warning ("union cannot be made transparent");
5484 /* If this structure or union completes the type of any previous
5485 variable declaration, lay it out and output its rtl. */
5487 if (current_binding_level->n_incomplete != 0)
5490 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5492 if (TREE_TYPE (decl) == t
5493 && TREE_CODE (decl) != TYPE_DECL)
5495 layout_decl (decl, 0);
5496 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5497 maybe_objc_check_decl (decl);
5498 rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0);
5501 --current_binding_level->n_incomplete;
5503 else if (!COMPLETE_TYPE_P (TREE_TYPE (decl))
5504 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5506 tree element = TREE_TYPE (decl);
5507 while (TREE_CODE (element) == ARRAY_TYPE)
5508 element = TREE_TYPE (element);
5510 layout_array_type (TREE_TYPE (decl));
5515 /* Finish debugging output for this type. */
5516 rest_of_type_compilation (t, toplevel);
5521 /* Lay out the type T, and its element type, and so on. */
5524 layout_array_type (t)
5527 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5528 layout_array_type (TREE_TYPE (t));
5532 /* Begin compiling the definition of an enumeration type.
5533 NAME is its name (or null if anonymous).
5534 Returns the type object, as yet incomplete.
5535 Also records info about it so that build_enumerator
5536 may be used to declare the individual values as they are read. */
5542 register tree enumtype = 0;
5544 /* If this is the real definition for a previous forward reference,
5545 fill in the contents in the same object that used to be the
5546 forward reference. */
5549 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5551 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5553 enumtype = make_node (ENUMERAL_TYPE);
5554 pushtag (name, enumtype);
5557 C_TYPE_BEING_DEFINED (enumtype) = 1;
5559 if (TYPE_VALUES (enumtype) != 0)
5561 /* This enum is a named one that has been declared already. */
5562 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5564 /* Completely replace its old definition.
5565 The old enumerators remain defined, however. */
5566 TYPE_VALUES (enumtype) = 0;
5569 enum_next_value = integer_zero_node;
5572 if (flag_short_enums)
5573 TYPE_PACKED (enumtype) = 1;
5578 /* After processing and defining all the values of an enumeration type,
5579 install their decls in the enumeration type and finish it off.
5580 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5581 and ATTRIBUTES are the specified attributes.
5582 Returns ENUMTYPE. */
5585 finish_enum (enumtype, values, attributes)
5590 register tree pair, tem;
5591 tree minnode = 0, maxnode = 0, enum_value_type;
5592 int precision, unsign;
5593 int toplevel = (global_binding_level == current_binding_level);
5595 if (in_parm_level_p ())
5596 warning ("enum defined inside parms");
5598 decl_attributes (enumtype, attributes, NULL_TREE);
5600 /* Calculate the maximum value of any enumerator in this type. */
5602 if (values == error_mark_node)
5603 minnode = maxnode = integer_zero_node;
5606 minnode = maxnode = TREE_VALUE (values);
5607 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5609 tree value = TREE_VALUE (pair);
5610 if (tree_int_cst_lt (maxnode, value))
5612 if (tree_int_cst_lt (value, minnode))
5617 /* Construct the final type of this enumeration. It is the same
5618 as one of the integral types - the narrowest one that fits, except
5619 that normally we only go as narrow as int - and signed iff any of
5620 the values are negative. */
5621 unsign = (tree_int_cst_sgn (minnode) >= 0);
5622 precision = MAX (min_precision (minnode, unsign),
5623 min_precision (maxnode, unsign));
5624 if (!TYPE_PACKED (enumtype))
5625 precision = MAX (precision, TYPE_PRECISION (integer_type_node));
5626 if (type_for_size (precision, unsign) == 0)
5628 warning ("enumeration values exceed range of largest integer");
5629 precision = TYPE_PRECISION (long_long_integer_type_node);
5632 if (precision == TYPE_PRECISION (integer_type_node))
5633 enum_value_type = type_for_size (precision, 0);
5635 enum_value_type = enumtype;
5637 TYPE_MIN_VALUE (enumtype) = minnode;
5638 TYPE_MAX_VALUE (enumtype) = maxnode;
5639 TYPE_PRECISION (enumtype) = precision;
5640 TREE_UNSIGNED (enumtype) = unsign;
5641 TYPE_SIZE (enumtype) = 0;
5642 layout_type (enumtype);
5644 if (values != error_mark_node)
5646 /* Change the type of the enumerators to be the enum type. We
5647 need to do this irrespective of the size of the enum, for
5648 proper type checking. Replace the DECL_INITIALs of the
5649 enumerators, and the value slots of the list, with copies
5650 that have the enum type; they cannot be modified in place
5651 because they may be shared (e.g. integer_zero_node) Finally,
5652 change the purpose slots to point to the names of the decls. */
5653 for (pair = values; pair; pair = TREE_CHAIN (pair))
5655 tree enu = TREE_PURPOSE (pair);
5657 TREE_TYPE (enu) = enumtype;
5658 DECL_SIZE (enu) = TYPE_SIZE (enumtype);
5659 DECL_SIZE_UNIT (enu) = TYPE_SIZE_UNIT (enumtype);
5660 DECL_ALIGN (enu) = TYPE_ALIGN (enumtype);
5661 DECL_USER_ALIGN (enu) = TYPE_USER_ALIGN (enumtype);
5662 DECL_MODE (enu) = TYPE_MODE (enumtype);
5664 /* The ISO C Standard mandates enumerators to have type int,
5665 even though the underlying type of an enum type is
5666 unspecified. Here we convert any enumerators that fit in
5667 an int to type int, to avoid promotions to unsigned types
5668 when comparing integers with enumerators that fit in the
5669 int range. When -pedantic is given, build_enumerator()
5670 would have already taken care of those that don't fit. */
5671 if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
5672 DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
5674 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5676 TREE_PURPOSE (pair) = DECL_NAME (enu);
5677 TREE_VALUE (pair) = DECL_INITIAL (enu);
5680 TYPE_VALUES (enumtype) = values;
5683 /* Fix up all variant types of this enum type. */
5684 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5686 if (tem == enumtype)
5688 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5689 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5690 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5691 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5692 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5693 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5694 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5695 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5696 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5697 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5700 /* Finish debugging output for this type. */
5701 rest_of_type_compilation (enumtype, toplevel);
5706 /* Build and install a CONST_DECL for one value of the
5707 current enumeration type (one that was begun with start_enum).
5708 Return a tree-list containing the CONST_DECL and its value.
5709 Assignment of sequential values by default is handled here. */
5712 build_enumerator (name, value)
5715 register tree decl, type;
5717 /* Validate and default VALUE. */
5719 /* Remove no-op casts from the value. */
5721 STRIP_TYPE_NOPS (value);
5725 if (TREE_CODE (value) == INTEGER_CST)
5727 value = default_conversion (value);
5728 constant_expression_warning (value);
5732 error ("enumerator value for `%s' not integer constant",
5733 IDENTIFIER_POINTER (name));
5738 /* Default based on previous value. */
5739 /* It should no longer be possible to have NON_LVALUE_EXPR
5743 value = enum_next_value;
5745 error ("overflow in enumeration values");
5748 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5750 pedwarn ("ISO C restricts enumerator values to range of `int'");
5751 value = convert (integer_type_node, value);
5754 /* Set basis for default for next value. */
5755 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5756 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5758 /* Now create a declaration for the enum value name. */
5760 type = TREE_TYPE (value);
5761 type = type_for_size (MAX (TYPE_PRECISION (type),
5762 TYPE_PRECISION (integer_type_node)),
5764 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
5765 && TREE_UNSIGNED (type)));
5767 decl = build_decl (CONST_DECL, name, type);
5768 DECL_INITIAL (decl) = convert (type, value);
5771 return tree_cons (decl, value, NULL_TREE);
5774 /* Create the FUNCTION_DECL for a function definition.
5775 DECLSPECS, DECLARATOR, PREFIX_ATTRIBUTES and ATTRIBUTES are the parts of
5776 the declaration; they describe the function's name and the type it returns,
5777 but twisted together in a fashion that parallels the syntax of C.
5779 This function creates a binding context for the function body
5780 as well as setting up the FUNCTION_DECL in current_function_decl.
5782 Returns 1 on success. If the DECLARATOR is not suitable for a function
5783 (it defines a datum instead), we return 0, which tells
5784 yyparse to report a parse error. */
5787 start_function (declspecs, declarator, prefix_attributes, attributes)
5788 tree declarator, declspecs, prefix_attributes, attributes;
5790 tree decl1, old_decl;
5792 int old_immediate_size_expand = immediate_size_expand;
5794 current_function_returns_value = 0; /* Assume, until we see it does. */
5795 current_function_returns_null = 0;
5796 warn_about_return_type = 0;
5797 current_extern_inline = 0;
5798 c_function_varargs = 0;
5800 shadowed_labels = 0;
5802 /* Don't expand any sizes in the return type of the function. */
5803 immediate_size_expand = 0;
5805 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
5807 /* If the declarator is not suitable for a function definition,
5808 cause a syntax error. */
5811 immediate_size_expand = old_immediate_size_expand;
5815 decl_attributes (decl1, prefix_attributes, attributes);
5817 announce_function (decl1);
5819 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5821 error ("return type is an incomplete type");
5822 /* Make it return void instead. */
5824 = build_function_type (void_type_node,
5825 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5828 if (warn_about_return_type)
5829 pedwarn_c99 ("return type defaults to `int'");
5831 /* Save the parm names or decls from this function's declarator
5832 where store_parm_decls will find them. */
5833 current_function_parms = last_function_parms;
5834 current_function_parm_tags = last_function_parm_tags;
5836 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5837 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5838 DECL_INITIAL (decl1) = error_mark_node;
5840 /* If this definition isn't a prototype and we had a prototype declaration
5841 before, copy the arg type info from that prototype.
5842 But not if what we had before was a builtin function. */
5843 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5844 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5845 && !DECL_BUILT_IN (old_decl)
5846 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5847 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5848 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5850 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5851 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
5852 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
5855 /* If there is no explicit declaration, look for any out-of-scope implicit
5858 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
5860 /* Optionally warn of old-fashioned def with no previous prototype. */
5861 if (warn_strict_prototypes
5862 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5863 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
5864 warning ("function declaration isn't a prototype");
5865 /* Optionally warn of any global def with no previous prototype. */
5866 else if (warn_missing_prototypes
5867 && TREE_PUBLIC (decl1)
5868 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0)
5869 && ! MAIN_NAME_P (DECL_NAME (decl1)))
5870 warning_with_decl (decl1, "no previous prototype for `%s'");
5871 /* Optionally warn of any def with no previous prototype
5872 if the function has already been used. */
5873 else if (warn_missing_prototypes
5874 && old_decl != 0 && TREE_USED (old_decl)
5875 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5876 warning_with_decl (decl1,
5877 "`%s' was used with no prototype before its definition");
5878 /* Optionally warn of any global def with no previous declaration. */
5879 else if (warn_missing_declarations
5880 && TREE_PUBLIC (decl1)
5882 && ! MAIN_NAME_P (DECL_NAME (decl1)))
5883 warning_with_decl (decl1, "no previous declaration for `%s'");
5884 /* Optionally warn of any def with no previous declaration
5885 if the function has already been used. */
5886 else if (warn_missing_declarations
5887 && old_decl != 0 && TREE_USED (old_decl)
5888 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
5889 warning_with_decl (decl1,
5890 "`%s' was used with no declaration before its definition");
5892 /* This is a definition, not a reference.
5893 So normally clear DECL_EXTERNAL.
5894 However, `extern inline' acts like a declaration
5895 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5896 DECL_EXTERNAL (decl1) = current_extern_inline;
5898 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
5899 SET_DEFAULT_DECL_ATTRIBUTES (decl1, attributes);
5902 /* This function exists in static storage.
5903 (This does not mean `static' in the C sense!) */
5904 TREE_STATIC (decl1) = 1;
5906 /* A nested function is not global. */
5907 if (current_function_decl != 0)
5908 TREE_PUBLIC (decl1) = 0;
5910 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5911 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
5916 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5917 != integer_type_node)
5918 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
5920 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
5921 args = TREE_CHAIN (args))
5923 tree type = args ? TREE_VALUE (args) : 0;
5925 if (type == void_type_node)
5932 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
5933 pedwarn_with_decl (decl1,
5934 "first argument of `%s' should be `int'");
5938 if (TREE_CODE (type) != POINTER_TYPE
5939 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5940 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5942 pedwarn_with_decl (decl1,
5943 "second argument of `%s' should be `char **'");
5947 if (TREE_CODE (type) != POINTER_TYPE
5948 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5949 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5951 pedwarn_with_decl (decl1,
5952 "third argument of `%s' should probably be `char **'");
5957 /* It is intentional that this message does not mention the third
5958 argument, which is warned for only pedantically, because it's
5959 blessed by mention in an appendix of the standard. */
5960 if (argct > 0 && (argct < 2 || argct > 3))
5961 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
5963 if (argct == 3 && pedantic)
5964 pedwarn_with_decl (decl1, "third argument of `%s' is deprecated");
5966 if (! TREE_PUBLIC (decl1))
5967 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
5970 /* Record the decl so that the function name is defined.
5971 If we already have a decl for this name, and it is a FUNCTION_DECL,
5972 use the old decl. */
5974 current_function_decl = pushdecl (decl1);
5977 declare_parm_level (1);
5978 current_binding_level->subblocks_tag_transparent = 1;
5980 make_function_rtl (current_function_decl);
5982 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5983 /* Promote the value to int before returning it. */
5984 if (C_PROMOTING_INTEGER_TYPE_P (restype))
5986 /* It retains unsignedness if traditional
5987 or if not really getting wider. */
5988 if (TREE_UNSIGNED (restype)
5989 && (flag_traditional
5990 || (TYPE_PRECISION (restype)
5991 == TYPE_PRECISION (integer_type_node))))
5992 restype = unsigned_type_node;
5994 restype = integer_type_node;
5996 DECL_RESULT (current_function_decl)
5997 = build_decl (RESULT_DECL, NULL_TREE, restype);
5999 /* If this fcn was already referenced via a block-scope `extern' decl
6000 (or an implicit decl), propagate certain information about the usage. */
6001 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6002 TREE_ADDRESSABLE (current_function_decl) = 1;
6004 immediate_size_expand = old_immediate_size_expand;
6009 /* Record that this function is going to be a varargs function.
6010 This is called before store_parm_decls, which is too early
6011 to call mark_varargs directly. */
6016 c_function_varargs = 1;
6019 /* Store the parameter declarations into the current function declaration.
6020 This is called after parsing the parameter declarations, before
6021 digesting the body of the function.
6023 For an old-style definition, modify the function's type
6024 to specify at least the number of arguments. */
6029 register tree fndecl = current_function_decl;
6032 /* This is either a chain of PARM_DECLs (if a prototype was used)
6033 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6034 tree specparms = current_function_parms;
6036 /* This is a list of types declared among parms in a prototype. */
6037 tree parmtags = current_function_parm_tags;
6039 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6040 register tree parmdecls = getdecls ();
6042 /* This is a chain of any other decls that came in among the parm
6043 declarations. If a parm is declared with enum {foo, bar} x;
6044 then CONST_DECLs for foo and bar are put here. */
6047 /* Nonzero if this definition is written with a prototype. */
6050 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6052 /* This case is when the function was defined with an ANSI prototype.
6053 The parms already have decls, so we need not do anything here
6054 except record them as in effect
6055 and complain if any redundant old-style parm decls were written. */
6066 error_with_decl (fndecl,
6067 "parm types given both in parmlist and separately");
6068 /* Get rid of the erroneous decls; don't keep them on
6069 the list of parms, since they might not be PARM_DECLs. */
6070 for (decl = current_binding_level->names;
6071 decl; decl = TREE_CHAIN (decl))
6072 if (DECL_NAME (decl))
6073 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6074 for (link = current_binding_level->shadowed;
6075 link; link = TREE_CHAIN (link))
6076 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6077 current_binding_level->names = 0;
6078 current_binding_level->shadowed = 0;
6081 specparms = nreverse (specparms);
6082 for (parm = specparms; parm; parm = next)
6084 next = TREE_CHAIN (parm);
6085 if (TREE_CODE (parm) == PARM_DECL)
6087 if (DECL_NAME (parm) == 0)
6088 error_with_decl (parm, "parameter name omitted");
6089 else if (TREE_CODE (TREE_TYPE (parm)) != ERROR_MARK
6090 && VOID_TYPE_P (TREE_TYPE (parm)))
6092 error_with_decl (parm, "parameter `%s' declared void");
6093 /* Change the type to error_mark_node so this parameter
6094 will be ignored by assign_parms. */
6095 TREE_TYPE (parm) = error_mark_node;
6101 /* If we find an enum constant or a type tag,
6102 put it aside for the moment. */
6103 TREE_CHAIN (parm) = 0;
6104 others = chainon (others, parm);
6108 /* Get the decls in their original chain order
6109 and record in the function. */
6110 DECL_ARGUMENTS (fndecl) = getdecls ();
6113 /* If this function takes a variable number of arguments,
6114 add a phony parameter to the end of the parm list,
6115 to represent the position of the first unnamed argument. */
6116 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6119 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6120 /* Let's hope the address of the unnamed parm
6121 won't depend on its type. */
6122 TREE_TYPE (dummy) = integer_type_node;
6123 DECL_ARG_TYPE (dummy) = integer_type_node;
6124 DECL_ARGUMENTS (fndecl) = chainon (DECL_ARGUMENTS (fndecl), dummy);
6128 /* Now pushdecl the enum constants. */
6129 for (parm = others; parm; parm = next)
6131 next = TREE_CHAIN (parm);
6132 if (DECL_NAME (parm) == 0)
6134 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6136 else if (TREE_CODE (parm) != PARM_DECL)
6140 storetags (chainon (parmtags, gettags ()));
6144 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6145 each with a parm name as the TREE_VALUE.
6147 PARMDECLS is a chain of declarations for parameters.
6148 Warning! It can also contain CONST_DECLs which are not parameters
6149 but are names of enumerators of any enum types
6150 declared among the parameters.
6152 First match each formal parameter name with its declaration.
6153 Associate decls with the names and store the decls
6154 into the TREE_PURPOSE slots. */
6156 /* We use DECL_WEAK as a flag to show which parameters have been
6157 seen already since it is not used on PARM_DECL or CONST_DECL. */
6158 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6159 DECL_WEAK (parm) = 0;
6161 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6163 register tree tail, found = NULL;
6165 if (TREE_VALUE (parm) == 0)
6167 error_with_decl (fndecl,
6168 "parameter name missing from parameter list");
6169 TREE_PURPOSE (parm) = 0;
6173 /* See if any of the parmdecls specifies this parm by name.
6174 Ignore any enumerator decls. */
6175 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6176 if (DECL_NAME (tail) == TREE_VALUE (parm)
6177 && TREE_CODE (tail) == PARM_DECL)
6183 /* If declaration already marked, we have a duplicate name.
6184 Complain, and don't use this decl twice. */
6185 if (found && DECL_WEAK (found))
6187 error_with_decl (found, "multiple parameters named `%s'");
6191 /* If the declaration says "void", complain and ignore it. */
6192 if (found && VOID_TYPE_P (TREE_TYPE (found)))
6194 error_with_decl (found, "parameter `%s' declared void");
6195 TREE_TYPE (found) = integer_type_node;
6196 DECL_ARG_TYPE (found) = integer_type_node;
6197 layout_decl (found, 0);
6200 /* Traditionally, a parm declared float is actually a double. */
6201 if (found && flag_traditional
6202 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6204 TREE_TYPE (found) = double_type_node;
6205 DECL_ARG_TYPE (found) = double_type_node;
6206 layout_decl (found, 0);
6209 /* If no declaration found, default to int. */
6212 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6214 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6215 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6216 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6218 pedwarn_with_decl (found, "type of `%s' defaults to `int'");
6219 else if (extra_warnings)
6220 warning_with_decl (found, "type of `%s' defaults to `int'");
6224 TREE_PURPOSE (parm) = found;
6226 /* Mark this decl as "already found". */
6227 DECL_WEAK (found) = 1;
6230 /* Put anything which is on the parmdecls chain and which is
6231 not a PARM_DECL onto the list NONPARMS. (The types of
6232 non-parm things which might appear on the list include
6233 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6234 any actual PARM_DECLs not matched with any names. */
6237 for (parm = parmdecls; parm;)
6239 tree next = TREE_CHAIN (parm);
6240 TREE_CHAIN (parm) = 0;
6242 if (TREE_CODE (parm) != PARM_DECL)
6243 nonparms = chainon (nonparms, parm);
6246 /* Complain about args with incomplete types. */
6247 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6249 error_with_decl (parm, "parameter `%s' has incomplete type");
6250 TREE_TYPE (parm) = error_mark_node;
6253 if (! DECL_WEAK (parm))
6255 error_with_decl (parm,
6256 "declaration for parameter `%s' but no such parameter");
6257 /* Pretend the parameter was not missing.
6258 This gets us to a standard state and minimizes
6259 further error messages. */
6261 = chainon (specparms,
6262 tree_cons (parm, NULL_TREE, NULL_TREE));
6269 /* Chain the declarations together in the order of the list of
6270 names. Store that chain in the function decl, replacing the
6273 DECL_ARGUMENTS (fndecl) = 0;
6276 for (last = 0; parm; parm = TREE_CHAIN (parm))
6277 if (TREE_PURPOSE (parm))
6280 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6282 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6283 last = TREE_PURPOSE (parm);
6284 TREE_CHAIN (last) = 0;
6288 /* If there was a previous prototype,
6289 set the DECL_ARG_TYPE of each argument according to
6290 the type previously specified, and report any mismatches. */
6292 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6295 for (parm = DECL_ARGUMENTS (fndecl),
6296 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6297 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6298 != void_type_node));
6299 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6301 if (parm == 0 || type == 0
6302 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6304 error ("number of arguments doesn't match prototype");
6305 error_with_file_and_line (current_function_prototype_file,
6306 current_function_prototype_line,
6307 "prototype declaration");
6310 /* Type for passing arg must be consistent
6311 with that declared for the arg. */
6312 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
6314 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6315 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6317 /* Adjust argument to match prototype. E.g. a previous
6318 `int foo(float);' prototype causes
6319 `int foo(x) float x; {...}' to be treated like
6320 `int foo(float x) {...}'. This is particularly
6321 useful for argument types like uid_t. */
6322 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6324 if (PROMOTE_PROTOTYPES
6325 && (TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
6326 || TREE_CODE (TREE_TYPE (parm)) == ENUMERAL_TYPE)
6327 && TYPE_PRECISION (TREE_TYPE (parm))
6328 < TYPE_PRECISION (integer_type_node))
6329 DECL_ARG_TYPE (parm) = integer_type_node;
6333 pedwarn ("promoted argument `%s' doesn't match prototype",
6334 IDENTIFIER_POINTER (DECL_NAME (parm)));
6335 warning_with_file_and_line
6336 (current_function_prototype_file,
6337 current_function_prototype_line,
6338 "prototype declaration");
6341 /* If -traditional, allow `int' argument to match
6342 `unsigned' prototype. */
6343 else if (! (flag_traditional
6344 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6345 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6347 error ("argument `%s' doesn't match prototype",
6348 IDENTIFIER_POINTER (DECL_NAME (parm)));
6349 error_with_file_and_line (current_function_prototype_file,
6350 current_function_prototype_line,
6351 "prototype declaration");
6355 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6358 /* Otherwise, create a prototype that would match. */
6362 tree actual = 0, last = 0, type;
6364 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6366 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6368 TREE_CHAIN (last) = type;
6373 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6375 TREE_CHAIN (last) = type;
6379 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6380 of the type of this function, but we need to avoid having this
6381 affect the types of other similarly-typed functions, so we must
6382 first force the generation of an identical (but separate) type
6383 node for the relevant function type. The new node we create
6384 will be a variant of the main variant of the original function
6387 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6389 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6392 /* Now store the final chain of decls for the arguments
6393 as the decl-chain of the current lexical scope.
6394 Put the enumerators in as well, at the front so that
6395 DECL_ARGUMENTS is not modified. */
6397 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6400 /* Make sure the binding level for the top of the function body
6401 gets a BLOCK if there are any in the function.
6402 Otherwise, the dbx output is wrong. */
6404 keep_next_if_subblocks = 1;
6406 /* ??? This might be an improvement,
6407 but needs to be thought about some more. */
6409 keep_next_level_flag = 1;
6412 /* Write a record describing this function definition to the prototypes
6413 file (if requested). */
6415 gen_aux_info_record (fndecl, 1, 0, prototype);
6417 /* Initialize the RTL code for the function. */
6419 init_function_start (fndecl, input_filename, lineno);
6421 /* If this is a varargs function, inform function.c. */
6423 if (c_function_varargs)
6426 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
6428 declare_function_name ();
6430 /* Set up parameters and prepare for return, for the function. */
6432 expand_function_start (fndecl, 0);
6434 /* If this function is `main', emit a call to `__main'
6435 to run global initializers, etc. */
6436 if (DECL_NAME (fndecl)
6437 && MAIN_NAME_P (DECL_NAME (fndecl))
6438 && DECL_CONTEXT (fndecl) == NULL_TREE)
6439 expand_main_function ();
6442 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6443 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6444 stands for an ellipsis in the identifier list.
6446 PARMLIST is the data returned by get_parm_info for the
6447 parmlist that follows the semicolon.
6449 We return a value of the same sort that get_parm_info returns,
6450 except that it describes the combination of identifiers and parmlist. */
6453 combine_parm_decls (specparms, parmlist, void_at_end)
6454 tree specparms, parmlist;
6457 register tree fndecl = current_function_decl;
6460 tree parmdecls = TREE_PURPOSE (parmlist);
6462 /* This is a chain of any other decls that came in among the parm
6463 declarations. They were separated already by get_parm_info,
6464 so we just need to keep them separate. */
6465 tree nonparms = TREE_VALUE (parmlist);
6469 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6470 DECL_WEAK (parm) = 0;
6472 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6474 register tree tail, found = NULL;
6476 /* See if any of the parmdecls specifies this parm by name. */
6477 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6478 if (DECL_NAME (tail) == TREE_VALUE (parm))
6484 /* If declaration already marked, we have a duplicate name.
6485 Complain, and don't use this decl twice. */
6486 if (found && DECL_WEAK (found))
6488 error_with_decl (found, "multiple parameters named `%s'");
6492 /* If the declaration says "void", complain and ignore it. */
6493 if (found && VOID_TYPE_P (TREE_TYPE (found)))
6495 error_with_decl (found, "parameter `%s' declared void");
6496 TREE_TYPE (found) = integer_type_node;
6497 DECL_ARG_TYPE (found) = integer_type_node;
6498 layout_decl (found, 0);
6501 /* Traditionally, a parm declared float is actually a double. */
6502 if (found && flag_traditional
6503 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6505 TREE_TYPE (found) = double_type_node;
6506 DECL_ARG_TYPE (found) = double_type_node;
6507 layout_decl (found, 0);
6510 /* If no declaration found, default to int. */
6513 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6515 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6516 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6517 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6518 error_with_decl (found, "type of parameter `%s' is not declared");
6522 TREE_PURPOSE (parm) = found;
6524 /* Mark this decl as "already found". */
6525 DECL_WEAK (found) = 1;
6528 /* Complain about any actual PARM_DECLs not matched with any names. */
6530 for (parm = parmdecls; parm;)
6532 tree next = TREE_CHAIN (parm);
6533 TREE_CHAIN (parm) = 0;
6535 /* Complain about args with incomplete types. */
6536 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6538 error_with_decl (parm, "parameter `%s' has incomplete type");
6539 TREE_TYPE (parm) = error_mark_node;
6542 if (! DECL_WEAK (parm))
6544 error_with_decl (parm,
6545 "declaration for parameter `%s' but no such parameter");
6546 /* Pretend the parameter was not missing.
6547 This gets us to a standard state and minimizes
6548 further error messages. */
6550 = chainon (specparms,
6551 tree_cons (parm, NULL_TREE, NULL_TREE));
6557 /* Chain the declarations together in the order of the list of names.
6558 At the same time, build up a list of their types, in reverse order. */
6564 for (last = 0; parm; parm = TREE_CHAIN (parm))
6565 if (TREE_PURPOSE (parm))
6568 parmdecls = TREE_PURPOSE (parm);
6570 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6571 last = TREE_PURPOSE (parm);
6572 TREE_CHAIN (last) = 0;
6574 types = tree_cons (NULL_TREE, TREE_TYPE (parm), types);
6579 return tree_cons (parmdecls, nonparms,
6580 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
6582 return tree_cons (parmdecls, nonparms, nreverse (types));
6585 /* Finish up a function declaration and compile that function
6586 all the way to assembler language output. The free the storage
6587 for the function definition.
6589 This is called after parsing the body of the function definition.
6591 NESTED is nonzero if the function being finished is nested in another. */
6594 finish_function (nested)
6597 register tree fndecl = current_function_decl;
6599 /* TREE_READONLY (fndecl) = 1;
6600 This caused &foo to be of type ptr-to-const-function
6601 which then got a warning when stored in a ptr-to-function variable. */
6604 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6606 /* Must mark the RESULT_DECL as being in this function. */
6608 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6610 /* Obey `register' declarations if `setjmp' is called in this fn. */
6611 if (flag_traditional && current_function_calls_setjmp)
6613 setjmp_protect (DECL_INITIAL (fndecl));
6614 setjmp_protect_args ();
6617 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6619 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6620 != integer_type_node)
6622 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6623 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6625 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
6629 #ifdef DEFAULT_MAIN_RETURN
6630 /* Make it so that `main' always returns success by default. */
6631 DEFAULT_MAIN_RETURN;
6634 c_expand_return (integer_zero_node);
6639 /* Generate rtl for function exit. */
6640 expand_function_end (input_filename, lineno, 0);
6642 /* So we can tell if jump_optimize sets it to 1. */
6645 /* If this is a nested function, protect the local variables in the stack
6646 above us from being collected while we're compiling this function. */
6648 ggc_push_context ();
6650 /* Run the optimizers and output the assembler code for this function. */
6651 rest_of_compilation (fndecl);
6653 /* Undo the GC context switch. */
6657 current_function_returns_null |= can_reach_end;
6659 if (warn_missing_noreturn
6660 && !TREE_THIS_VOLATILE (fndecl)
6661 && !current_function_returns_null
6662 && !current_function_returns_value)
6663 warning ("function might be possible candidate for attribute `noreturn'");
6665 if (TREE_THIS_VOLATILE (fndecl) && current_function_returns_null)
6666 warning ("`noreturn' function does return");
6667 else if (warn_return_type && can_reach_end
6668 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (fndecl))))
6669 /* If this function returns non-void and control can drop through,
6671 warning ("control reaches end of non-void function");
6672 /* With just -W, complain only if function returns both with
6673 and without a value. */
6674 else if (extra_warnings
6675 && current_function_returns_value && current_function_returns_null)
6676 warning ("this function may return with or without a value");
6678 /* If requested, warn about function definitions where the function will
6679 return a value (usually of some struct or union type) which itself will
6680 take up a lot of stack space. */
6682 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6684 tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6686 if (ret_type && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST
6687 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type),
6690 unsigned int size_as_int
6691 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type));
6693 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0)
6694 warning_with_decl (fndecl,
6695 "size of return value of `%s' is %u bytes",
6698 warning_with_decl (fndecl,
6699 "size of return value of `%s' is larger than %d bytes",
6704 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested)
6706 /* Stop pointing to the local nodes about to be freed.
6707 But DECL_INITIAL must remain nonzero so we know this
6708 was an actual function definition.
6709 For a nested function, this is done in pop_c_function_context.
6710 If rest_of_compilation set this to 0, leave it 0. */
6711 if (DECL_INITIAL (fndecl) != 0)
6712 DECL_INITIAL (fndecl) = error_mark_node;
6714 DECL_ARGUMENTS (fndecl) = 0;
6717 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6719 #ifndef ASM_OUTPUT_CONSTRUCTOR
6720 if (! flag_gnu_linker)
6721 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6724 assemble_constructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl)));
6727 if (DECL_STATIC_DESTRUCTOR (fndecl))
6729 #ifndef ASM_OUTPUT_DESTRUCTOR
6730 if (! flag_gnu_linker)
6731 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6734 assemble_destructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl)));
6739 /* Let the error reporting routines know that we're outside a
6740 function. For a nested function, this value is used in
6741 pop_c_function_context and then reset via pop_function_context. */
6742 current_function_decl = NULL;
6746 /* Save and restore the variables in this file and elsewhere
6747 that keep track of the progress of compilation of the current function.
6748 Used for nested functions. */
6750 struct language_function
6753 tree shadowed_labels;
6756 int warn_about_return_type;
6758 struct binding_level *binding_level;
6761 /* Save and reinitialize the variables
6762 used during compilation of a C function. */
6765 push_c_function_context (f)
6768 struct language_function *p;
6769 p = (struct language_function *) xmalloc (sizeof (struct language_function));
6772 p->named_labels = named_labels;
6773 p->shadowed_labels = shadowed_labels;
6774 p->returns_value = current_function_returns_value;
6775 p->returns_null = current_function_returns_null;
6776 p->warn_about_return_type = warn_about_return_type;
6777 p->extern_inline = current_extern_inline;
6778 p->binding_level = current_binding_level;
6781 /* Restore the variables used during compilation of a C function. */
6784 pop_c_function_context (f)
6787 struct language_function *p = f->language;
6790 /* Bring back all the labels that were shadowed. */
6791 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
6792 if (DECL_NAME (TREE_VALUE (link)) != 0)
6793 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
6794 = TREE_VALUE (link);
6796 if (DECL_SAVED_INSNS (current_function_decl) == 0)
6798 /* Stop pointing to the local nodes about to be freed. */
6799 /* But DECL_INITIAL must remain nonzero so we know this
6800 was an actual function definition. */
6801 DECL_INITIAL (current_function_decl) = error_mark_node;
6802 DECL_ARGUMENTS (current_function_decl) = 0;
6805 named_labels = p->named_labels;
6806 shadowed_labels = p->shadowed_labels;
6807 current_function_returns_value = p->returns_value;
6808 current_function_returns_null = p->returns_null;
6809 warn_about_return_type = p->warn_about_return_type;
6810 current_extern_inline = p->extern_inline;
6811 current_binding_level = p->binding_level;
6817 /* Mark the language specific parts of F for GC. */
6820 mark_c_function_context (f)
6823 struct language_function *p = f->language;
6828 ggc_mark_tree (p->shadowed_labels);
6829 ggc_mark_tree (p->named_labels);
6830 mark_binding_level (&p->binding_level);
6833 /* integrate_decl_tree calls this function, but since we don't use the
6834 DECL_LANG_SPECIFIC field, this is a no-op. */
6837 copy_lang_decl (node)
6838 tree node ATTRIBUTE_UNUSED;
6842 /* Mark ARG for GC. */
6845 lang_mark_false_label_stack (arg)
6846 struct label_node *arg;
6848 /* C doesn't use false_label_stack. It better be NULL. */
6853 /* Mark the language specific bits in T for GC. */
6859 if (TREE_CODE (t) == IDENTIFIER_NODE)
6861 struct lang_identifier *i = (struct lang_identifier *) t;
6862 ggc_mark_tree (i->global_value);
6863 ggc_mark_tree (i->local_value);
6864 ggc_mark_tree (i->label_value);
6865 ggc_mark_tree (i->implicit_decl);
6866 ggc_mark_tree (i->error_locus);
6867 ggc_mark_tree (i->limbo_value);
6869 else if (TYPE_P (t) && TYPE_LANG_SPECIFIC (t))
6870 ggc_mark (TYPE_LANG_SPECIFIC (t));
6873 /* The functions below are required for functionality of doing
6874 function at once processing in the C front end. Currently these
6875 functions are not called from anywhere in the C front end, but as
6876 these changes continue, that will change. */
6878 /* Returns non-zero if the current statement is a full expression,
6879 i.e. temporaries created during that statement should be destroyed
6880 at the end of the statement. */
6883 stmts_are_full_exprs_p ()
6888 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6892 anon_aggr_type_p (node)
6893 tree node ATTRIBUTE_UNUSED;
6898 /* One if we have already declared __FUNCTION__ (and related
6899 variables) in the current function. Two if we are in the process
6903 current_function_name_declared ()
6909 /* Code to generate the RTL for a case label in C. */
6912 do_case (low_value, high_value)
6916 tree value1 = NULL_TREE, value2 = NULL_TREE, label;
6918 if (low_value != NULL_TREE)
6919 value1 = check_case_value (low_value);
6920 if (high_value != NULL_TREE)
6921 value2 = check_case_value (high_value);
6923 label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
6925 if (pedantic && (high_value != NULL_TREE))
6926 pedwarn ("ISO C forbids case ranges");
6928 if (value1 != error_mark_node && value2 != error_mark_node)
6933 if (high_value == NULL_TREE && value1 != NULL_TREE &&
6934 pedantic && ! INTEGRAL_TYPE_P (TREE_TYPE (value1)))
6935 pedwarn ("label must have integral type in ISO C");
6937 if (low_value == NULL_TREE)
6938 success = pushcase (NULL_TREE, 0, label, &duplicate);
6939 else if (high_value == NULL_TREE)
6940 success = pushcase (value1, convert_and_check, label, &duplicate);
6942 success = pushcase_range (value1, value2, convert_and_check,
6947 if (low_value == NULL_TREE)
6948 error ("default label not within a switch statement");
6950 error ("case label not within a switch statement");
6952 else if (success == 2)
6954 if (low_value == NULL_TREE)
6956 error ("multiple default labels in one switch");
6957 error_with_decl (duplicate, "this is the first default label");
6960 error ("dupicate case value");
6961 if (high_value != NULL_TREE)
6962 error_with_decl (duplicate,
6963 "this is the first entry for that value");
6965 else if (low_value != NULL_TREE)
6968 warning ("case value out of range");
6969 else if (success == 5)
6970 error ("case label within scope of cleanup or variable array");
6975 /* Language specific handler of tree nodes used when generating RTL
6979 lang_expand_stmt (t)
6980 tree t ATTRIBUTE_UNUSED;
6986 /* Accessor to set the 'current_function_name_declared' flag. */
6989 set_current_function_name_declared (i)
6990 int i ATTRIBUTE_UNUSED;