1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 92-98, 1999 Free Software Foundation, Inc.
4 This file is part of GNU CC.
6 GNU CC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU CC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU CC; see the file COPYING. If not, write to
18 the Free Software Foundation, 59 Temple Place - Suite 330,
19 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. */
42 extern cpp_reader parse_in;
45 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
47 { NORMAL, /* Ordinary declaration */
48 FUNCDEF, /* Function definition */
49 PARM, /* Declaration of parm before function body */
50 FIELD, /* Declaration inside struct or union */
51 BITFIELD, /* Likewise but with specified width */
52 TYPENAME}; /* Typename (inside cast or sizeof) */
54 #ifndef CHAR_TYPE_SIZE
55 #define CHAR_TYPE_SIZE BITS_PER_UNIT
58 #ifndef SHORT_TYPE_SIZE
59 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
63 #define INT_TYPE_SIZE BITS_PER_WORD
66 #ifndef LONG_TYPE_SIZE
67 #define LONG_TYPE_SIZE BITS_PER_WORD
70 #ifndef LONG_LONG_TYPE_SIZE
71 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
74 #ifndef WCHAR_UNSIGNED
75 #define WCHAR_UNSIGNED 0
78 #ifndef FLOAT_TYPE_SIZE
79 #define FLOAT_TYPE_SIZE BITS_PER_WORD
82 #ifndef DOUBLE_TYPE_SIZE
83 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
86 #ifndef LONG_DOUBLE_TYPE_SIZE
87 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
90 /* We let tm.h override the types used here, to handle trivial differences
91 such as the choice of unsigned int or long unsigned int for size_t.
92 When machines start needing nontrivial differences in the size type,
93 it would be best to do something here to figure out automatically
94 from other information what type to use. */
97 #define SIZE_TYPE "long unsigned int"
101 #define PTRDIFF_TYPE "long int"
105 #define WCHAR_TYPE "int"
108 /* a node which has tree code ERROR_MARK, and whose type is itself.
109 All erroneous expressions are replaced with this node. All functions
110 that accept nodes as arguments should avoid generating error messages
111 if this node is one of the arguments, since it is undesirable to get
112 multiple error messages from one error in the input. */
114 tree error_mark_node;
116 /* These can't be part of the above array, since they are declared
117 individually in tree.h, and used by the debug output routines. */
121 tree integer_type_node;
122 tree unsigned_type_node;
124 /* These can't be part of the above array, since they are declared
125 individially in tree.h and used by the target routines. */
128 tree va_list_type_node;
130 /* Two expressions that are constants with value zero.
131 The first is of type `int', the second of type `void *'. */
133 tree integer_zero_node;
134 tree null_pointer_node;
136 /* A node for the integer constant 1. */
138 tree integer_one_node;
140 /* Nonzero if we have seen an invalid cross reference
141 to a struct, union, or enum, but not yet printed the message. */
143 tree pending_invalid_xref;
144 /* File and line to appear in the eventual error message. */
145 char *pending_invalid_xref_file;
146 int pending_invalid_xref_line;
148 /* While defining an enum type, this is 1 plus the last enumerator
149 constant value. Note that will do not have to save this or `enum_overflow'
150 around nested function definition since such a definition could only
151 occur in an enum value expression and we don't use these variables in
154 static tree enum_next_value;
156 /* Nonzero means that there was overflow computing enum_next_value. */
158 static int enum_overflow;
160 /* Parsing a function declarator leaves a list of parameter names
161 or a chain or parameter decls here. */
163 static tree last_function_parms;
165 /* Parsing a function declarator leaves here a chain of structure
166 and enum types declared in the parmlist. */
168 static tree last_function_parm_tags;
170 /* After parsing the declarator that starts a function definition,
171 `start_function' puts here the list of parameter names or chain of decls.
172 `store_parm_decls' finds it here. */
174 static tree current_function_parms;
176 /* Similar, for last_function_parm_tags. */
177 static tree current_function_parm_tags;
179 /* Similar, for the file and line that the prototype came from if this is
180 an old-style definition. */
181 static char *current_function_prototype_file;
182 static int current_function_prototype_line;
184 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
185 that have names. Here so we can clear out their names' definitions
186 at the end of the function. */
188 static tree named_labels;
190 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
192 static tree shadowed_labels;
194 /* Nonzero when store_parm_decls is called indicates a varargs function.
195 Value not meaningful after store_parm_decls. */
197 static int c_function_varargs;
199 /* The FUNCTION_DECL for the function currently being compiled,
200 or 0 if between functions. */
201 tree current_function_decl;
203 /* Set to 0 at beginning of a function definition, set to 1 if
204 a return statement that specifies a return value is seen. */
206 int current_function_returns_value;
208 /* Set to 0 at beginning of a function definition, set to 1 if
209 a return statement with no argument is seen. */
211 int current_function_returns_null;
213 /* Set to nonzero by `grokdeclarator' for a function
214 whose return type is defaulted, if warnings for this are desired. */
216 static int warn_about_return_type;
218 /* Nonzero when starting a function declared `extern inline'. */
220 static int current_extern_inline;
222 /* For each binding contour we allocate a binding_level structure
223 * which records the names defined in that contour.
226 * 1) one for each function definition,
227 * where internal declarations of the parameters appear.
228 * 2) one for each compound statement,
229 * to record its declarations.
231 * The current meaning of a name can be found by searching the levels from
232 * the current one out to the global one.
235 /* Note that the information in the `names' component of the global contour
236 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
240 /* A chain of _DECL nodes for all variables, constants, functions,
241 and typedef types. These are in the reverse of the order supplied.
245 /* A list of structure, union and enum definitions,
246 * for looking up tag names.
247 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
248 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
249 * or ENUMERAL_TYPE node.
253 /* For each level, a list of shadowed outer-level local definitions
254 to be restored when this level is popped.
255 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
256 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
259 /* For each level (except not the global one),
260 a chain of BLOCK nodes for all the levels
261 that were entered and exited one level down. */
264 /* The BLOCK node for this level, if one has been preallocated.
265 If 0, the BLOCK is allocated (if needed) when the level is popped. */
268 /* The binding level which this one is contained in (inherits from). */
269 struct binding_level *level_chain;
271 /* Nonzero for the level that holds the parameters of a function. */
274 /* Nonzero if this level "doesn't exist" for tags. */
275 char tag_transparent;
277 /* Nonzero if sublevels of this level "don't exist" for tags.
278 This is set in the parm level of a function definition
279 while reading the function body, so that the outermost block
280 of the function body will be tag-transparent. */
281 char subblocks_tag_transparent;
283 /* Nonzero means make a BLOCK for this level regardless of all else. */
286 /* Nonzero means make a BLOCK if this level has any subblocks. */
287 char keep_if_subblocks;
289 /* Number of decls in `names' that have incomplete
290 structure or union types. */
293 /* A list of decls giving the (reversed) specified order of parms,
294 not including any forward-decls in the parmlist.
295 This is so we can put the parms in proper order for assign_parms. */
299 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
301 /* The binding level currently in effect. */
303 static struct binding_level *current_binding_level;
305 /* A chain of binding_level structures awaiting reuse. */
307 static struct binding_level *free_binding_level;
309 /* The outermost binding level, for names of file scope.
310 This is created when the compiler is started and exists
311 through the entire run. */
313 static struct binding_level *global_binding_level;
315 /* Binding level structures are initialized by copying this one. */
317 static struct binding_level clear_binding_level
318 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, 0,
321 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
323 static int keep_next_level_flag;
325 /* Nonzero means make a BLOCK for the next level pushed
326 if it has subblocks. */
328 static int keep_next_if_subblocks;
330 /* The chain of outer levels of label scopes.
331 This uses the same data structure used for binding levels,
332 but it works differently: each link in the chain records
333 saved values of named_labels and shadowed_labels for
334 a label binding level outside the current one. */
336 static struct binding_level *label_level_chain;
338 /* Functions called automatically at the beginning and end of execution. */
340 tree static_ctors, static_dtors;
342 /* Forward declarations. */
344 static struct binding_level * make_binding_level PROTO((void));
345 static void clear_limbo_values PROTO((tree));
346 static int duplicate_decls PROTO((tree, tree, int));
347 static int redeclaration_error_message PROTO((tree, tree));
348 static void storedecls PROTO((tree));
349 static void storetags PROTO((tree));
350 static tree lookup_tag PROTO((enum tree_code, tree,
351 struct binding_level *, int));
352 static tree lookup_tag_reverse PROTO((tree));
353 static tree grokdeclarator PROTO((tree, tree, enum decl_context,
355 static tree grokparms PROTO((tree, int));
356 static int field_decl_cmp PROTO((const GENERIC_PTR, const GENERIC_PTR));
357 static void layout_array_type PROTO((tree));
359 /* C-specific option variables. */
361 /* Nonzero means allow type mismatches in conditional expressions;
362 just make their values `void'. */
364 int flag_cond_mismatch;
366 /* Nonzero means give `double' the same size as `float'. */
368 int flag_short_double;
370 /* Nonzero means don't recognize the keyword `asm'. */
374 /* Nonzero means don't recognize any builtin functions. */
378 /* Nonzero means don't recognize the non-ANSI builtin functions.
381 int flag_no_nonansi_builtin;
383 /* Nonzero means do some things the same way PCC does. */
385 int flag_traditional;
387 /* Nonzero means use the ISO C9x dialect of C. */
391 /* Nonzero means that we have builtin functions, and main is an int */
395 /* Nonzero means to allow single precision math even if we're generally
396 being traditional. */
397 int flag_allow_single_precision = 0;
399 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
401 int flag_signed_bitfields = 1;
402 int explicit_flag_signed_bitfields = 0;
404 /* Nonzero means warn about use of implicit int. */
406 int warn_implicit_int;
408 /* Nonzero means warn about usage of long long when `-pedantic'. */
410 int warn_long_long = 1;
412 /* Nonzero means message about use of implicit function declarations;
413 1 means warning; 2 means error. */
415 int mesg_implicit_function_declaration;
417 /* Nonzero means give string constants the type `const char *'
418 to get extra warnings from them. These warnings will be too numerous
419 to be useful, except in thoroughly ANSIfied programs. */
421 int flag_const_strings;
423 /* Nonzero means warn about pointer casts that can drop a type qualifier
424 from the pointer target type. */
428 /* Nonzero means warn when casting a function call to a type that does
429 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
430 when there is no previous declaration of sqrt or malloc. */
432 int warn_bad_function_cast;
434 /* Warn about functions which might be candidates for attribute noreturn. */
436 int warn_missing_noreturn;
438 /* Warn about traditional constructs whose meanings changed in ANSI C. */
440 int warn_traditional;
442 /* Nonzero means warn about sizeof(function) or addition/subtraction
443 of function pointers. */
445 int warn_pointer_arith;
447 /* Nonzero means warn for non-prototype function decls
448 or non-prototyped defs without previous prototype. */
450 int warn_strict_prototypes;
452 /* Nonzero means warn for any global function def
453 without separate previous prototype decl. */
455 int warn_missing_prototypes;
457 /* Nonzero means warn for any global function def
458 without separate previous decl. */
460 int warn_missing_declarations;
462 /* Nonzero means warn about multiple (redundant) decls for the same single
463 variable or function. */
465 int warn_redundant_decls = 0;
467 /* Nonzero means warn about extern declarations of objects not at
468 file-scope level and about *all* declarations of functions (whether
469 extern or static) not at file-scope level. Note that we exclude
470 implicit function declarations. To get warnings about those, use
473 int warn_nested_externs = 0;
475 /* Warn about *printf or *scanf format/argument anomalies. */
479 /* Warn about a subscript that has type char. */
481 int warn_char_subscripts = 0;
483 /* Warn if a type conversion is done that might have confusing results. */
487 /* Warn if adding () is suggested. */
489 int warn_parentheses;
491 /* Warn if initializer is not completely bracketed. */
493 int warn_missing_braces;
495 /* Warn if main is suspicious. */
499 /* Warn about #pragma directives that are not recognised. */
501 int warn_unknown_pragmas = 0; /* Tri state variable. */
503 /* Warn about comparison of signed and unsigned values.
504 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
506 int warn_sign_compare = -1;
508 /* Nonzero means warn about use of multicharacter literals. */
510 int warn_multichar = 1;
512 /* Nonzero means `$' can be in an identifier. */
514 #ifndef DOLLARS_IN_IDENTIFIERS
515 #define DOLLARS_IN_IDENTIFIERS 1
517 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
519 /* Decode the string P as a language-specific option for C.
520 Return the number of strings consumed. */
523 c_decode_option (argc, argv)
524 int argc ATTRIBUTE_UNUSED;
527 int strings_processed;
530 strings_processed = cpp_handle_option (&parse_in, argc, argv);
532 strings_processed = 0;
533 #endif /* ! USE_CPPLIB */
535 if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
537 flag_traditional = 1;
538 flag_writable_strings = 1;
540 else if (!strcmp (p, "-fallow-single-precision"))
541 flag_allow_single_precision = 1;
542 else if (!strcmp (p, "-fhosted") || !strcmp (p, "-fno-freestanding"))
547 else if (!strcmp (p, "-ffreestanding") || !strcmp (p, "-fno-hosted"))
551 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
555 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
557 flag_traditional = 0;
558 flag_writable_strings = 0;
560 else if (!strncmp (p, "-std=", 5))
562 /* Select the appropriate language standard. We currently
564 -std=iso9899:1990 same as -ansi
565 -std=iso9899:199409 ISO C as modified in amend. 1
566 -std=iso9899:199x ISO C 9x
567 -std=c89 same as -std=iso9899:1990
568 -std=c9x same as -std=iso9899:199x
569 -std=gnu89 default, iso9899:1990 + gnu extensions
570 -std=gnu9x iso9899:199x + gnu extensions
572 const char *argstart = &p[5];
574 if (!strcmp (argstart, "iso9899:1990")
575 || !strcmp (argstart, "c89"))
578 flag_traditional = 0;
579 flag_writable_strings = 0;
581 flag_no_nonansi_builtin = 1;
584 else if (!strcmp (argstart, "iso9899:199409"))
586 /* ??? The changes since ISO C 1990 are not supported. */
589 else if (!strcmp (argstart, "iso9899:199x")
590 || !strcmp (argstart, "c9x"))
592 flag_traditional = 0;
593 flag_writable_strings = 0;
595 flag_no_nonansi_builtin = 1;
598 else if (!strcmp (argstart, "gnu89"))
600 flag_traditional = 0;
601 flag_writable_strings = 0;
603 flag_no_nonansi_builtin = 0;
606 else if (!strcmp (argstart, "gnu9x"))
608 flag_traditional = 0;
609 flag_writable_strings = 0;
611 flag_no_nonansi_builtin = 0;
615 error ("unknown C standard `%s'", argstart);
617 else if (!strcmp (p, "-fdollars-in-identifiers"))
618 dollars_in_ident = 1;
619 else if (!strcmp (p, "-fno-dollars-in-identifiers"))
620 dollars_in_ident = 0;
621 else if (!strcmp (p, "-fsigned-char"))
622 flag_signed_char = 1;
623 else if (!strcmp (p, "-funsigned-char"))
624 flag_signed_char = 0;
625 else if (!strcmp (p, "-fno-signed-char"))
626 flag_signed_char = 0;
627 else if (!strcmp (p, "-fno-unsigned-char"))
628 flag_signed_char = 1;
629 else if (!strcmp (p, "-fsigned-bitfields")
630 || !strcmp (p, "-fno-unsigned-bitfields"))
632 flag_signed_bitfields = 1;
633 explicit_flag_signed_bitfields = 1;
635 else if (!strcmp (p, "-funsigned-bitfields")
636 || !strcmp (p, "-fno-signed-bitfields"))
638 flag_signed_bitfields = 0;
639 explicit_flag_signed_bitfields = 1;
641 else if (!strcmp (p, "-fshort-enums"))
642 flag_short_enums = 1;
643 else if (!strcmp (p, "-fno-short-enums"))
644 flag_short_enums = 0;
645 else if (!strcmp (p, "-fcond-mismatch"))
646 flag_cond_mismatch = 1;
647 else if (!strcmp (p, "-fno-cond-mismatch"))
648 flag_cond_mismatch = 0;
649 else if (!strcmp (p, "-fshort-double"))
650 flag_short_double = 1;
651 else if (!strcmp (p, "-fno-short-double"))
652 flag_short_double = 0;
653 else if (!strcmp (p, "-fasm"))
655 else if (!strcmp (p, "-fno-asm"))
657 else if (!strcmp (p, "-fbuiltin"))
659 else if (!strcmp (p, "-fno-builtin"))
661 else if (!strcmp (p, "-ansi"))
663 else if (!strcmp (p, "-Werror-implicit-function-declaration"))
664 mesg_implicit_function_declaration = 2;
665 else if (!strcmp (p, "-Wimplicit-function-declaration"))
666 mesg_implicit_function_declaration = 1;
667 else if (!strcmp (p, "-Wno-implicit-function-declaration"))
668 mesg_implicit_function_declaration = 0;
669 else if (!strcmp (p, "-Wimplicit-int"))
670 warn_implicit_int = 1;
671 else if (!strcmp (p, "-Wno-implicit-int"))
672 warn_implicit_int = 0;
673 else if (!strcmp (p, "-Wimplicit"))
675 warn_implicit_int = 1;
676 if (mesg_implicit_function_declaration != 2)
677 mesg_implicit_function_declaration = 1;
679 else if (!strcmp (p, "-Wno-implicit"))
680 warn_implicit_int = 0, mesg_implicit_function_declaration = 0;
681 else if (!strcmp (p, "-Wlong-long"))
683 else if (!strcmp (p, "-Wno-long-long"))
685 else if (!strcmp (p, "-Wwrite-strings"))
686 flag_const_strings = 1;
687 else if (!strcmp (p, "-Wno-write-strings"))
688 flag_const_strings = 0;
689 else if (!strcmp (p, "-Wcast-qual"))
691 else if (!strcmp (p, "-Wno-cast-qual"))
693 else if (!strcmp (p, "-Wbad-function-cast"))
694 warn_bad_function_cast = 1;
695 else if (!strcmp (p, "-Wno-bad-function-cast"))
696 warn_bad_function_cast = 0;
697 else if (!strcmp (p, "-Wmissing-noreturn"))
698 warn_missing_noreturn = 1;
699 else if (!strcmp (p, "-Wno-missing-noreturn"))
700 warn_missing_noreturn = 0;
701 else if (!strcmp (p, "-Wpointer-arith"))
702 warn_pointer_arith = 1;
703 else if (!strcmp (p, "-Wno-pointer-arith"))
704 warn_pointer_arith = 0;
705 else if (!strcmp (p, "-Wstrict-prototypes"))
706 warn_strict_prototypes = 1;
707 else if (!strcmp (p, "-Wno-strict-prototypes"))
708 warn_strict_prototypes = 0;
709 else if (!strcmp (p, "-Wmissing-prototypes"))
710 warn_missing_prototypes = 1;
711 else if (!strcmp (p, "-Wno-missing-prototypes"))
712 warn_missing_prototypes = 0;
713 else if (!strcmp (p, "-Wmissing-declarations"))
714 warn_missing_declarations = 1;
715 else if (!strcmp (p, "-Wno-missing-declarations"))
716 warn_missing_declarations = 0;
717 else if (!strcmp (p, "-Wredundant-decls"))
718 warn_redundant_decls = 1;
719 else if (!strcmp (p, "-Wno-redundant-decls"))
720 warn_redundant_decls = 0;
721 else if (!strcmp (p, "-Wnested-externs"))
722 warn_nested_externs = 1;
723 else if (!strcmp (p, "-Wno-nested-externs"))
724 warn_nested_externs = 0;
725 else if (!strcmp (p, "-Wtraditional"))
726 warn_traditional = 1;
727 else if (!strcmp (p, "-Wno-traditional"))
728 warn_traditional = 0;
729 else if (!strcmp (p, "-Wformat"))
731 else if (!strcmp (p, "-Wno-format"))
733 else if (!strcmp (p, "-Wchar-subscripts"))
734 warn_char_subscripts = 1;
735 else if (!strcmp (p, "-Wno-char-subscripts"))
736 warn_char_subscripts = 0;
737 else if (!strcmp (p, "-Wconversion"))
739 else if (!strcmp (p, "-Wno-conversion"))
741 else if (!strcmp (p, "-Wparentheses"))
742 warn_parentheses = 1;
743 else if (!strcmp (p, "-Wno-parentheses"))
744 warn_parentheses = 0;
745 else if (!strcmp (p, "-Wreturn-type"))
746 warn_return_type = 1;
747 else if (!strcmp (p, "-Wno-return-type"))
748 warn_return_type = 0;
749 else if (!strcmp (p, "-Wcomment"))
750 ; /* cpp handles this one. */
751 else if (!strcmp (p, "-Wno-comment"))
752 ; /* cpp handles this one. */
753 else if (!strcmp (p, "-Wcomments"))
754 ; /* cpp handles this one. */
755 else if (!strcmp (p, "-Wno-comments"))
756 ; /* cpp handles this one. */
757 else if (!strcmp (p, "-Wtrigraphs"))
758 ; /* cpp handles this one. */
759 else if (!strcmp (p, "-Wno-trigraphs"))
760 ; /* cpp handles this one. */
761 else if (!strcmp (p, "-Wundef"))
762 ; /* cpp handles this one. */
763 else if (!strcmp (p, "-Wno-undef"))
764 ; /* cpp handles this one. */
765 else if (!strcmp (p, "-Wimport"))
766 ; /* cpp handles this one. */
767 else if (!strcmp (p, "-Wno-import"))
768 ; /* cpp handles this one. */
769 else if (!strcmp (p, "-Wmissing-braces"))
770 warn_missing_braces = 1;
771 else if (!strcmp (p, "-Wno-missing-braces"))
772 warn_missing_braces = 0;
773 else if (!strcmp (p, "-Wmain"))
775 else if (!strcmp (p, "-Wno-main"))
777 else if (!strcmp (p, "-Wsign-compare"))
778 warn_sign_compare = 1;
779 else if (!strcmp (p, "-Wno-sign-compare"))
780 warn_sign_compare = 0;
781 else if (!strcmp (p, "-Wmultichar"))
783 else if (!strcmp (p, "-Wno-multichar"))
785 else if (!strcmp (p, "-Wunknown-pragmas"))
786 /* Set to greater than 1, so that even unknown pragmas in system
787 headers will be warned about. */
788 warn_unknown_pragmas = 2;
789 else if (!strcmp (p, "-Wno-unknown-pragmas"))
790 warn_unknown_pragmas = 0;
791 else if (!strcmp (p, "-Wall"))
793 /* We save the value of warn_uninitialized, since if they put
794 -Wuninitialized on the command line, we need to generate a
795 warning about not using it without also specifying -O. */
796 if (warn_uninitialized != 1)
797 warn_uninitialized = 2;
798 warn_implicit_int = 1;
799 mesg_implicit_function_declaration = 1;
800 warn_return_type = 1;
804 warn_char_subscripts = 1;
805 warn_parentheses = 1;
806 warn_missing_braces = 1;
807 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
808 it off only if it's not explicit. */
810 /* Only warn about unknown pragmas that are not in system headers. */
811 warn_unknown_pragmas = 1;
814 return strings_processed;
819 /* Hooks for print_node. */
822 print_lang_decl (file, node, indent)
823 FILE *file ATTRIBUTE_UNUSED;
824 tree node ATTRIBUTE_UNUSED;
825 int indent ATTRIBUTE_UNUSED;
830 print_lang_type (file, node, indent)
831 FILE *file ATTRIBUTE_UNUSED;
832 tree node ATTRIBUTE_UNUSED;
833 int indent ATTRIBUTE_UNUSED;
838 print_lang_identifier (file, node, indent)
843 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
844 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
845 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
846 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
847 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
848 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
851 /* Hook called at end of compilation to assume 1 elt
852 for a top-level array decl that wasn't complete before. */
855 finish_incomplete_decl (decl)
858 if (TREE_CODE (decl) == VAR_DECL)
860 tree type = TREE_TYPE (decl);
861 if (type != error_mark_node
862 && TREE_CODE (type) == ARRAY_TYPE
863 && TYPE_DOMAIN (type) == 0)
865 if (! DECL_EXTERNAL (decl))
866 warning_with_decl (decl, "array `%s' assumed to have one element");
868 complete_array_type (type, NULL_TREE, 1);
870 layout_decl (decl, 0);
875 /* Create a new `struct binding_level'. */
878 struct binding_level *
879 make_binding_level ()
882 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
885 /* Nonzero if we are currently in the global binding level. */
890 return current_binding_level == global_binding_level;
896 keep_next_level_flag = 1;
899 /* Nonzero if the current level needs to have a BLOCK made. */
904 return ((current_binding_level->keep_if_subblocks
905 && current_binding_level->blocks != 0)
906 || current_binding_level->keep
907 || current_binding_level->names != 0
908 || (current_binding_level->tags != 0
909 && !current_binding_level->tag_transparent));
912 /* Identify this binding level as a level of parameters.
913 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
914 But it turns out there is no way to pass the right value for
915 DEFINITION_FLAG, so we ignore it. */
918 declare_parm_level (definition_flag)
919 int definition_flag ATTRIBUTE_UNUSED;
921 current_binding_level->parm_flag = 1;
924 /* Nonzero if currently making parm declarations. */
929 return current_binding_level->parm_flag;
932 /* Enter a new binding level.
933 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
934 not for that of tags. */
937 pushlevel (tag_transparent)
940 register struct binding_level *newlevel = NULL_BINDING_LEVEL;
942 /* If this is the top level of a function,
943 just make sure that NAMED_LABELS is 0. */
945 if (current_binding_level == global_binding_level)
950 /* Reuse or create a struct for this binding level. */
952 if (free_binding_level)
954 newlevel = free_binding_level;
955 free_binding_level = free_binding_level->level_chain;
959 newlevel = make_binding_level ();
962 /* Add this level to the front of the chain (stack) of levels that
965 *newlevel = clear_binding_level;
966 newlevel->tag_transparent
968 || (current_binding_level
969 ? current_binding_level->subblocks_tag_transparent
971 newlevel->level_chain = current_binding_level;
972 current_binding_level = newlevel;
973 newlevel->keep = keep_next_level_flag;
974 keep_next_level_flag = 0;
975 newlevel->keep_if_subblocks = keep_next_if_subblocks;
976 keep_next_if_subblocks = 0;
979 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
982 clear_limbo_values (block)
987 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
988 if (DECL_NAME (tem) != 0)
989 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
991 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
992 clear_limbo_values (tem);
995 /* Exit a binding level.
996 Pop the level off, and restore the state of the identifier-decl mappings
997 that were in effect when this level was entered.
999 If KEEP is nonzero, this level had explicit declarations, so
1000 and create a "block" (a BLOCK node) for the level
1001 to record its declarations and subblocks for symbol table output.
1003 If FUNCTIONBODY is nonzero, this level is the body of a function,
1004 so create a block as if KEEP were set and also clear out all
1007 If REVERSE is nonzero, reverse the order of decls before putting
1008 them into the BLOCK. */
1011 poplevel (keep, reverse, functionbody)
1017 /* The chain of decls was accumulated in reverse order.
1018 Put it into forward order, just for cleanliness. */
1020 tree tags = current_binding_level->tags;
1021 tree subblocks = current_binding_level->blocks;
1024 int block_previously_created;
1026 keep |= current_binding_level->keep;
1028 /* This warning is turned off because it causes warnings for
1029 declarations like `extern struct foo *x'. */
1031 /* Warn about incomplete structure types in this level. */
1032 for (link = tags; link; link = TREE_CHAIN (link))
1033 if (TYPE_SIZE (TREE_VALUE (link)) == 0)
1035 tree type = TREE_VALUE (link);
1036 tree type_name = TYPE_NAME (type);
1037 char *id = IDENTIFIER_POINTER (TREE_CODE (type_name) == IDENTIFIER_NODE
1039 : DECL_NAME (type_name));
1040 switch (TREE_CODE (type))
1043 error ("`struct %s' incomplete in scope ending here", id);
1046 error ("`union %s' incomplete in scope ending here", id);
1049 error ("`enum %s' incomplete in scope ending here", id);
1055 /* Get the decls in the order they were written.
1056 Usually current_binding_level->names is in reverse order.
1057 But parameter decls were previously put in forward order. */
1060 current_binding_level->names
1061 = decls = nreverse (current_binding_level->names);
1063 decls = current_binding_level->names;
1065 /* Output any nested inline functions within this block
1066 if they weren't already output. */
1068 for (decl = decls; decl; decl = TREE_CHAIN (decl))
1069 if (TREE_CODE (decl) == FUNCTION_DECL
1070 && ! TREE_ASM_WRITTEN (decl)
1071 && DECL_INITIAL (decl) != 0
1072 && TREE_ADDRESSABLE (decl))
1074 /* If this decl was copied from a file-scope decl
1075 on account of a block-scope extern decl,
1076 propagate TREE_ADDRESSABLE to the file-scope decl.
1078 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1079 true, since then the decl goes through save_for_inline_copying. */
1080 if (DECL_ABSTRACT_ORIGIN (decl) != 0
1081 && DECL_ABSTRACT_ORIGIN (decl) != decl)
1082 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
1083 else if (DECL_SAVED_INSNS (decl) != 0)
1085 push_function_context ();
1086 output_inline_function (decl);
1087 pop_function_context ();
1091 /* If there were any declarations or structure tags in that level,
1092 or if this level is a function body,
1093 create a BLOCK to record them for the life of this function. */
1096 block_previously_created = (current_binding_level->this_block != 0);
1097 if (block_previously_created)
1098 block = current_binding_level->this_block;
1099 else if (keep || functionbody
1100 || (current_binding_level->keep_if_subblocks && subblocks != 0))
1101 block = make_node (BLOCK);
1104 BLOCK_VARS (block) = decls;
1105 BLOCK_TYPE_TAGS (block) = tags;
1106 BLOCK_SUBBLOCKS (block) = subblocks;
1107 remember_end_note (block);
1110 /* In each subblock, record that this is its superior. */
1112 for (link = subblocks; link; link = TREE_CHAIN (link))
1113 BLOCK_SUPERCONTEXT (link) = block;
1115 /* Clear out the meanings of the local variables of this level. */
1117 for (link = decls; link; link = TREE_CHAIN (link))
1119 if (DECL_NAME (link) != 0)
1121 /* If the ident. was used or addressed via a local extern decl,
1122 don't forget that fact. */
1123 if (DECL_EXTERNAL (link))
1125 if (TREE_USED (link))
1126 TREE_USED (DECL_NAME (link)) = 1;
1127 if (TREE_ADDRESSABLE (link))
1128 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1130 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1134 /* Restore all name-meanings of the outer levels
1135 that were shadowed by this level. */
1137 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1138 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1140 /* If the level being exited is the top level of a function,
1141 check over all the labels, and clear out the current
1142 (function local) meanings of their names. */
1146 clear_limbo_values (block);
1148 /* If this is the top level block of a function,
1149 the vars are the function's parameters.
1150 Don't leave them in the BLOCK because they are
1151 found in the FUNCTION_DECL instead. */
1153 BLOCK_VARS (block) = 0;
1155 /* Clear out the definitions of all label names,
1156 since their scopes end here,
1157 and add them to BLOCK_VARS. */
1159 for (link = named_labels; link; link = TREE_CHAIN (link))
1161 register tree label = TREE_VALUE (link);
1163 if (DECL_INITIAL (label) == 0)
1165 error_with_decl (label, "label `%s' used but not defined");
1166 /* Avoid crashing later. */
1167 define_label (input_filename, lineno,
1170 else if (warn_unused && !TREE_USED (label))
1171 warning_with_decl (label, "label `%s' defined but not used");
1172 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1174 /* Put the labels into the "variables" of the
1175 top-level block, so debugger can see them. */
1176 TREE_CHAIN (label) = BLOCK_VARS (block);
1177 BLOCK_VARS (block) = label;
1181 /* Pop the current level, and free the structure for reuse. */
1184 register struct binding_level *level = current_binding_level;
1185 current_binding_level = current_binding_level->level_chain;
1187 level->level_chain = free_binding_level;
1188 free_binding_level = level;
1191 /* Dispose of the block that we just made inside some higher level. */
1193 DECL_INITIAL (current_function_decl) = block;
1196 if (!block_previously_created)
1197 current_binding_level->blocks
1198 = chainon (current_binding_level->blocks, block);
1200 /* If we did not make a block for the level just exited,
1201 any blocks made for inner levels
1202 (since they cannot be recorded as subblocks in that level)
1203 must be carried forward so they will later become subblocks
1204 of something else. */
1206 current_binding_level->blocks
1207 = chainon (current_binding_level->blocks, subblocks);
1209 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1210 binding contour so that they point to the appropriate construct, i.e.
1211 either to the current FUNCTION_DECL node, or else to the BLOCK node
1212 we just constructed.
1214 Note that for tagged types whose scope is just the formal parameter
1215 list for some function type specification, we can't properly set
1216 their TYPE_CONTEXTs here, because we don't have a pointer to the
1217 appropriate FUNCTION_TYPE node readily available to us. For those
1218 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1219 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1220 node which will represent the "scope" for these "parameter list local"
1225 for (link = tags; link; link = TREE_CHAIN (link))
1226 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1228 for (link = tags; link; link = TREE_CHAIN (link))
1229 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1232 TREE_USED (block) = 1;
1236 /* Delete the node BLOCK from the current binding level.
1237 This is used for the block inside a stmt expr ({...})
1238 so that the block can be reinserted where appropriate. */
1241 delete_block (block)
1245 if (current_binding_level->blocks == block)
1246 current_binding_level->blocks = TREE_CHAIN (block);
1247 for (t = current_binding_level->blocks; t;)
1249 if (TREE_CHAIN (t) == block)
1250 TREE_CHAIN (t) = TREE_CHAIN (block);
1254 TREE_CHAIN (block) = NULL;
1255 /* Clear TREE_USED which is always set by poplevel.
1256 The flag is set again if insert_block is called. */
1257 TREE_USED (block) = 0;
1260 /* Insert BLOCK at the end of the list of subblocks of the
1261 current binding level. This is used when a BIND_EXPR is expanded,
1262 to handle the BLOCK node inside the BIND_EXPR. */
1265 insert_block (block)
1268 TREE_USED (block) = 1;
1269 current_binding_level->blocks
1270 = chainon (current_binding_level->blocks, block);
1273 /* Set the BLOCK node for the innermost scope
1274 (the one we are currently in). */
1278 register tree block;
1280 current_binding_level->this_block = block;
1286 register struct binding_level *newlevel;
1288 /* Reuse or create a struct for this binding level. */
1290 if (free_binding_level)
1292 newlevel = free_binding_level;
1293 free_binding_level = free_binding_level->level_chain;
1297 newlevel = make_binding_level ();
1300 /* Add this level to the front of the chain (stack) of label levels. */
1302 newlevel->level_chain = label_level_chain;
1303 label_level_chain = newlevel;
1305 newlevel->names = named_labels;
1306 newlevel->shadowed = shadowed_labels;
1308 shadowed_labels = 0;
1314 register struct binding_level *level = label_level_chain;
1317 /* Clear out the definitions of the declared labels in this level.
1318 Leave in the list any ordinary, non-declared labels. */
1319 for (link = named_labels, prev = 0; link;)
1321 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1323 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1325 error_with_decl (TREE_VALUE (link),
1326 "label `%s' used but not defined");
1327 /* Avoid crashing later. */
1328 define_label (input_filename, lineno,
1329 DECL_NAME (TREE_VALUE (link)));
1331 else if (warn_unused && !TREE_USED (TREE_VALUE (link)))
1332 warning_with_decl (TREE_VALUE (link),
1333 "label `%s' defined but not used");
1334 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1336 /* Delete this element from the list. */
1337 link = TREE_CHAIN (link);
1339 TREE_CHAIN (prev) = link;
1341 named_labels = link;
1346 link = TREE_CHAIN (link);
1350 /* Bring back all the labels that were shadowed. */
1351 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1352 if (DECL_NAME (TREE_VALUE (link)) != 0)
1353 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1354 = TREE_VALUE (link);
1356 named_labels = chainon (named_labels, level->names);
1357 shadowed_labels = level->shadowed;
1359 /* Pop the current level, and free the structure for reuse. */
1360 label_level_chain = label_level_chain->level_chain;
1361 level->level_chain = free_binding_level;
1362 free_binding_level = level;
1365 /* Push a definition or a declaration of struct, union or enum tag "name".
1366 "type" should be the type node.
1367 We assume that the tag "name" is not already defined.
1369 Note that the definition may really be just a forward reference.
1370 In that case, the TYPE_SIZE will be zero. */
1373 pushtag (name, type)
1376 register struct binding_level *b;
1378 /* Find the proper binding level for this type tag. */
1380 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1385 /* Record the identifier as the type's name if it has none. */
1387 if (TYPE_NAME (type) == 0)
1388 TYPE_NAME (type) = name;
1391 if (b == global_binding_level)
1392 b->tags = perm_tree_cons (name, type, b->tags);
1394 b->tags = saveable_tree_cons (name, type, b->tags);
1396 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1397 tagged type we just added to the current binding level. This fake
1398 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1399 to output a representation of a tagged type, and it also gives
1400 us a convenient place to record the "scope start" address for the
1403 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1405 /* An approximation for now, so we can tell this is a function-scope tag.
1406 This will be updated in poplevel. */
1407 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1410 /* Handle when a new declaration NEWDECL
1411 has the same name as an old one OLDDECL
1412 in the same binding contour.
1413 Prints an error message if appropriate.
1415 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1416 Otherwise, return 0.
1418 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1419 and OLDDECL is in an outer binding level and should thus not be changed. */
1422 duplicate_decls (newdecl, olddecl, different_binding_level)
1423 register tree newdecl, olddecl;
1424 int different_binding_level;
1426 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1427 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1428 && DECL_INITIAL (newdecl) != 0);
1429 tree oldtype = TREE_TYPE (olddecl);
1430 tree newtype = TREE_TYPE (newdecl);
1433 if (TREE_CODE_CLASS (TREE_CODE (olddecl)) == 'd')
1434 DECL_MACHINE_ATTRIBUTES (newdecl)
1435 = merge_machine_decl_attributes (olddecl, newdecl);
1437 if (TREE_CODE (newtype) == ERROR_MARK
1438 || TREE_CODE (oldtype) == ERROR_MARK)
1441 /* New decl is completely inconsistent with the old one =>
1442 tell caller to replace the old one.
1443 This is always an error except in the case of shadowing a builtin. */
1444 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1446 if (TREE_CODE (olddecl) == FUNCTION_DECL
1447 && (DECL_BUILT_IN (olddecl)
1448 || DECL_BUILT_IN_NONANSI (olddecl)))
1450 /* If you declare a built-in or predefined function name as static,
1451 the old definition is overridden,
1452 but optionally warn this was a bad choice of name. */
1453 if (!TREE_PUBLIC (newdecl))
1457 else if (DECL_BUILT_IN (olddecl))
1458 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1460 warning_with_decl (newdecl, "shadowing library function `%s'");
1462 /* Likewise, if the built-in is not ansi, then programs can
1463 override it even globally without an error. */
1464 else if (! DECL_BUILT_IN (olddecl))
1465 warning_with_decl (newdecl,
1466 "library function `%s' declared as non-function");
1468 else if (DECL_BUILT_IN_NONANSI (olddecl))
1469 warning_with_decl (newdecl,
1470 "built-in function `%s' declared as non-function");
1472 warning_with_decl (newdecl,
1473 "built-in function `%s' declared as non-function");
1477 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1478 error_with_decl (olddecl, "previous declaration of `%s'");
1484 /* For real parm decl following a forward decl,
1485 return 1 so old decl will be reused. */
1486 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1487 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1490 /* The new declaration is the same kind of object as the old one.
1491 The declarations may partially match. Print warnings if they don't
1492 match enough. Ultimately, copy most of the information from the new
1493 decl to the old one, and keep using the old one. */
1495 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1496 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1497 && DECL_INITIAL (olddecl) == 0)
1498 /* If -traditional, avoid error for redeclaring fcn
1499 after implicit decl. */
1501 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1502 && DECL_BUILT_IN (olddecl))
1504 /* A function declaration for a built-in function. */
1505 if (!TREE_PUBLIC (newdecl))
1507 /* If you declare a built-in function name as static, the
1508 built-in definition is overridden,
1509 but optionally warn this was a bad choice of name. */
1511 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1512 /* Discard the old built-in function. */
1515 else if (!types_match)
1517 /* Accept the return type of the new declaration if same modes. */
1518 tree oldreturntype = TREE_TYPE (oldtype);
1519 tree newreturntype = TREE_TYPE (newtype);
1521 /* Make sure we put the new type in the same obstack as the old ones.
1522 If the old types are not both in the same obstack, use the
1524 if (TYPE_OBSTACK (oldtype) == TYPE_OBSTACK (newtype))
1525 push_obstacks (TYPE_OBSTACK (oldtype), TYPE_OBSTACK (oldtype));
1528 push_obstacks_nochange ();
1529 end_temporary_allocation ();
1532 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
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 (newreturntype,
1538 TYPE_ARG_TYPES (oldtype));
1540 types_match = comptypes (newtype, trytype);
1544 /* Accept harmless mismatch in first argument type also.
1546 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1547 && TYPE_ARG_TYPES (oldtype) != 0
1548 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1549 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1550 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1551 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1553 /* Function types may be shared, so we can't just modify
1554 the return type of olddecl's function type. */
1556 = build_function_type (TREE_TYPE (oldtype),
1557 tree_cons (NULL_TREE,
1558 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1559 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1561 types_match = comptypes (newtype, trytype);
1565 if (! different_binding_level)
1566 TREE_TYPE (olddecl) = oldtype;
1572 /* If types don't match for a built-in, throw away the built-in. */
1573 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1577 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1578 && DECL_SOURCE_LINE (olddecl) == 0)
1580 /* A function declaration for a predeclared function
1581 that isn't actually built in. */
1582 if (!TREE_PUBLIC (newdecl))
1584 /* If you declare it as static, the
1585 default definition is overridden. */
1588 else if (!types_match)
1590 /* If the types don't match, preserve volatility indication.
1591 Later on, we will discard everything else about the
1592 default declaration. */
1593 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1596 /* Permit char *foo () to match void *foo (...) if not pedantic,
1597 if one of them came from a system header file. */
1598 else if (!types_match
1599 && TREE_CODE (olddecl) == FUNCTION_DECL
1600 && TREE_CODE (newdecl) == FUNCTION_DECL
1601 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1602 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1603 && (DECL_IN_SYSTEM_HEADER (olddecl)
1604 || DECL_IN_SYSTEM_HEADER (newdecl))
1605 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1606 && TYPE_ARG_TYPES (oldtype) == 0
1607 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1608 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1610 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1611 && TYPE_ARG_TYPES (newtype) == 0
1612 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1613 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1616 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1617 /* Make sure we keep void * as ret type, not char *. */
1618 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1619 TREE_TYPE (newdecl) = newtype = oldtype;
1621 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1622 we will come back here again. */
1623 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1625 else if (!types_match
1626 /* Permit char *foo (int, ...); followed by char *foo ();
1628 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1630 /* Return types must still match. */
1631 && comptypes (TREE_TYPE (oldtype),
1632 TREE_TYPE (newtype))
1633 && TYPE_ARG_TYPES (newtype) == 0))
1635 error_with_decl (newdecl, "conflicting types for `%s'");
1636 /* Check for function type mismatch
1637 involving an empty arglist vs a nonempty one. */
1638 if (TREE_CODE (olddecl) == FUNCTION_DECL
1639 && comptypes (TREE_TYPE (oldtype),
1640 TREE_TYPE (newtype))
1641 && ((TYPE_ARG_TYPES (oldtype) == 0
1642 && DECL_INITIAL (olddecl) == 0)
1644 (TYPE_ARG_TYPES (newtype) == 0
1645 && DECL_INITIAL (newdecl) == 0)))
1647 /* Classify the problem further. */
1648 register tree t = TYPE_ARG_TYPES (oldtype);
1650 t = TYPE_ARG_TYPES (newtype);
1651 for (; t; t = TREE_CHAIN (t))
1653 register tree type = TREE_VALUE (t);
1655 if (TREE_CHAIN (t) == 0
1656 && TYPE_MAIN_VARIANT (type) != void_type_node)
1658 error ("A parameter list with an ellipsis can't match an empty parameter name list declaration.");
1662 if (TYPE_MAIN_VARIANT (type) == float_type_node
1663 || C_PROMOTING_INTEGER_TYPE_P (type))
1665 error ("An argument type that has a default promotion can't match an empty parameter name list declaration.");
1670 error_with_decl (olddecl, "previous declaration of `%s'");
1674 errmsg = redeclaration_error_message (newdecl, olddecl);
1680 error_with_decl (newdecl, "redefinition of `%s'");
1683 error_with_decl (newdecl, "redeclaration of `%s'");
1686 error_with_decl (newdecl, "conflicting declarations of `%s'");
1692 error_with_decl (olddecl,
1693 ((DECL_INITIAL (olddecl)
1694 && current_binding_level == global_binding_level)
1695 ? "`%s' previously defined here"
1696 : "`%s' previously declared here"));
1698 else if (TREE_CODE (newdecl) == TYPE_DECL
1699 && (DECL_IN_SYSTEM_HEADER (olddecl)
1700 || DECL_IN_SYSTEM_HEADER (newdecl)))
1702 warning_with_decl (newdecl, "redefinition of `%s'");
1705 ((DECL_INITIAL (olddecl)
1706 && current_binding_level == global_binding_level)
1707 ? "`%s' previously defined here"
1708 : "`%s' previously declared here"));
1710 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1711 && DECL_INITIAL (olddecl) != 0
1712 && TYPE_ARG_TYPES (oldtype) == 0
1713 && TYPE_ARG_TYPES (newtype) != 0
1714 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1716 register tree type, parm;
1718 /* Prototype decl follows defn w/o prototype. */
1720 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1721 type = TYPE_ARG_TYPES (newtype),
1724 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1726 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1727 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1729 warning_with_decl (newdecl, "prototype for `%s' follows");
1730 warning_with_decl (olddecl, "non-prototype definition here");
1733 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1734 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1736 error_with_decl (newdecl, "prototype for `%s' follows and number of arguments doesn't match");
1737 error_with_decl (olddecl, "non-prototype definition here");
1741 /* Type for passing arg must be consistent
1742 with that declared for the arg. */
1743 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1744 /* If -traditional, allow `unsigned int' instead of `int'
1745 in the prototype. */
1746 && (! (flag_traditional
1747 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1748 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1750 error_with_decl (newdecl,
1751 "prototype for `%s' follows and argument %d doesn't match",
1753 error_with_decl (olddecl, "non-prototype definition here");
1759 /* Warn about mismatches in various flags. */
1762 /* Warn if function is now inline
1763 but was previously declared not inline and has been called. */
1764 if (TREE_CODE (olddecl) == FUNCTION_DECL
1765 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1766 && TREE_USED (olddecl))
1767 warning_with_decl (newdecl,
1768 "`%s' declared inline after being called");
1769 if (TREE_CODE (olddecl) == FUNCTION_DECL
1770 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1771 && DECL_INITIAL (olddecl) != 0)
1772 warning_with_decl (newdecl,
1773 "`%s' declared inline after its definition");
1775 /* If pedantic, warn when static declaration follows a non-static
1776 declaration. Otherwise, do so only for functions. */
1777 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1778 && TREE_PUBLIC (olddecl)
1779 && !TREE_PUBLIC (newdecl))
1780 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1782 /* If warn_traditional, warn when a non-static function
1783 declaration follows a static one. */
1784 if (warn_traditional
1785 && TREE_CODE (olddecl) == FUNCTION_DECL
1786 && !TREE_PUBLIC (olddecl)
1787 && TREE_PUBLIC (newdecl))
1788 warning_with_decl (newdecl, "non-static declaration for `%s' follows static");
1790 /* Warn when const declaration follows a non-const
1791 declaration, but not for functions. */
1792 if (TREE_CODE (olddecl) != FUNCTION_DECL
1793 && !TREE_READONLY (olddecl)
1794 && TREE_READONLY (newdecl))
1795 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1796 /* These bits are logically part of the type, for variables.
1797 But not for functions
1798 (where qualifiers are not valid ANSI anyway). */
1799 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1800 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1801 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1802 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1806 /* Optionally warn about more than one declaration for the same name. */
1807 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1808 /* Don't warn about a function declaration
1809 followed by a definition. */
1810 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1811 && DECL_INITIAL (olddecl) == 0)
1812 /* Don't warn about extern decl followed by (tentative) definition. */
1813 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1815 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1816 warning_with_decl (olddecl, "previous declaration of `%s'");
1819 /* Copy all the DECL_... slots specified in the new decl
1820 except for any that we copy here from the old type.
1822 Past this point, we don't change OLDTYPE and NEWTYPE
1823 even if we change the types of NEWDECL and OLDDECL. */
1827 /* When copying info to olddecl, we store into write_olddecl
1828 instead. This allows us to avoid modifying olddecl when
1829 different_binding_level is true. */
1830 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1832 /* Make sure we put the new type in the same obstack as the old ones.
1833 If the old types are not both in the same obstack, use the permanent
1835 if (TYPE_OBSTACK (oldtype) == TYPE_OBSTACK (newtype))
1836 push_obstacks (TYPE_OBSTACK (oldtype), TYPE_OBSTACK (oldtype));
1839 push_obstacks_nochange ();
1840 end_temporary_allocation ();
1843 /* Merge the data types specified in the two decls. */
1844 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1846 if (different_binding_level)
1848 = build_type_attribute_variant
1850 merge_attributes (TYPE_ATTRIBUTES (newtype),
1851 TYPE_ATTRIBUTES (oldtype)));
1854 = TREE_TYPE (olddecl)
1855 = common_type (newtype, oldtype);
1858 /* Lay the type out, unless already done. */
1859 if (oldtype != TREE_TYPE (newdecl))
1861 if (TREE_TYPE (newdecl) != error_mark_node)
1862 layout_type (TREE_TYPE (newdecl));
1863 if (TREE_CODE (newdecl) != FUNCTION_DECL
1864 && TREE_CODE (newdecl) != TYPE_DECL
1865 && TREE_CODE (newdecl) != CONST_DECL)
1866 layout_decl (newdecl, 0);
1870 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1871 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1872 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1873 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1874 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1877 /* Keep the old rtl since we can safely use it. */
1878 DECL_RTL (newdecl) = DECL_RTL (olddecl);
1880 /* Merge the type qualifiers. */
1881 if (DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1882 && !TREE_THIS_VOLATILE (newdecl))
1883 TREE_THIS_VOLATILE (write_olddecl) = 0;
1884 if (TREE_READONLY (newdecl))
1885 TREE_READONLY (write_olddecl) = 1;
1886 if (TREE_THIS_VOLATILE (newdecl))
1888 TREE_THIS_VOLATILE (write_olddecl) = 1;
1889 if (TREE_CODE (newdecl) == VAR_DECL)
1890 make_var_volatile (newdecl);
1893 /* Keep source location of definition rather than declaration. */
1894 /* When called with different_binding_level set, keep the old
1895 information so that meaningful diagnostics can be given. */
1896 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1897 && ! different_binding_level)
1899 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1900 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1903 /* Merge the unused-warning information. */
1904 if (DECL_IN_SYSTEM_HEADER (olddecl))
1905 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1906 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1907 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1909 /* Merge the initialization information. */
1910 /* When called with different_binding_level set, don't copy over
1911 DECL_INITIAL, so that we don't accidentally change function
1912 declarations into function definitions. */
1913 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1914 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1916 /* Merge the section attribute.
1917 We want to issue an error if the sections conflict but that must be
1918 done later in decl_attributes since we are called before attributes
1920 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1921 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1923 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1925 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1926 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1928 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1929 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1930 DECL_NO_CHECK_MEMORY_USAGE (newdecl)
1931 |= DECL_NO_CHECK_MEMORY_USAGE (olddecl);
1936 /* If cannot merge, then use the new type and qualifiers,
1937 and don't preserve the old rtl. */
1938 else if (! different_binding_level)
1940 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1941 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1942 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1943 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1946 /* Merge the storage class information. */
1947 DECL_WEAK (newdecl) |= DECL_WEAK (olddecl);
1948 /* For functions, static overrides non-static. */
1949 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1951 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1952 /* This is since we don't automatically
1953 copy the attributes of NEWDECL into OLDDECL. */
1954 /* No need to worry about different_binding_level here because
1955 then TREE_PUBLIC (newdecl) was true. */
1956 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1957 /* If this clears `static', clear it in the identifier too. */
1958 if (! TREE_PUBLIC (olddecl))
1959 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1961 if (DECL_EXTERNAL (newdecl))
1963 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1964 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1965 /* An extern decl does not override previous storage class. */
1966 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1967 if (! DECL_EXTERNAL (newdecl))
1968 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1972 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1973 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1976 /* If either decl says `inline', this fn is inline,
1977 unless its definition was passed already. */
1978 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
1979 DECL_INLINE (olddecl) = 1;
1980 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1982 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1984 if (DECL_BUILT_IN (olddecl))
1986 /* Get rid of any built-in function if new arg types don't match it
1987 or if we have a function definition. */
1988 if (! types_match || new_is_definition)
1990 if (! different_binding_level)
1992 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1993 DECL_BUILT_IN (olddecl) = 0;
1998 /* If redeclaring a builtin function, and not a definition,
1999 it stays built in. */
2000 DECL_BUILT_IN (newdecl) = 1;
2001 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2004 /* Also preserve various other info from the definition. */
2005 else if (! new_is_definition)
2006 DECL_FRAME_SIZE (newdecl) = DECL_FRAME_SIZE (olddecl);
2007 if (! new_is_definition)
2009 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2010 /* When called with different_binding_level set, don't copy over
2011 DECL_INITIAL, so that we don't accidentally change function
2012 declarations into function definitions. */
2013 if (! different_binding_level)
2014 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2015 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
2016 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2017 if (DECL_INLINE (newdecl))
2018 DECL_ABSTRACT_ORIGIN (newdecl) = DECL_ORIGIN (olddecl);
2021 if (different_binding_level)
2023 /* Don't output a duplicate symbol or debugging information for this
2026 Do not set TREE_ASM_WRITTEN for a FUNCTION_DECL since we may actually
2027 just have two declarations without a definition. VAR_DECLs may need
2028 the same treatment, I'm not sure. */
2029 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2030 DECL_IGNORED_P (newdecl) = 1;
2032 TREE_ASM_WRITTEN (newdecl) = DECL_IGNORED_P (newdecl) = 1;
2036 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2037 But preserve OLDDECL's DECL_UID. */
2039 register unsigned olddecl_uid = DECL_UID (olddecl);
2041 bcopy ((char *) newdecl + sizeof (struct tree_common),
2042 (char *) olddecl + sizeof (struct tree_common),
2043 sizeof (struct tree_decl) - sizeof (struct tree_common));
2044 DECL_UID (olddecl) = olddecl_uid;
2047 /* NEWDECL contains the merged attribute lists.
2048 Update OLDDECL to be the same. */
2049 DECL_MACHINE_ATTRIBUTES (olddecl) = DECL_MACHINE_ATTRIBUTES (newdecl);
2054 /* Record a decl-node X as belonging to the current lexical scope.
2055 Check for errors (such as an incompatible declaration for the same
2056 name already seen in the same scope).
2058 Returns either X or an old decl for the same name.
2059 If an old decl is returned, it may have been smashed
2060 to agree with what X says. */
2067 register tree name = DECL_NAME (x);
2068 register struct binding_level *b = current_binding_level;
2070 DECL_CONTEXT (x) = current_function_decl;
2071 /* A local extern declaration for a function doesn't constitute nesting.
2072 A local auto declaration does, since it's a forward decl
2073 for a nested function coming later. */
2074 if (TREE_CODE (x) == FUNCTION_DECL && DECL_INITIAL (x) == 0
2075 && DECL_EXTERNAL (x))
2076 DECL_CONTEXT (x) = 0;
2078 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
2079 && x != IDENTIFIER_IMPLICIT_DECL (name)
2080 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
2081 && !DECL_IN_SYSTEM_HEADER (x))
2082 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
2088 int different_binding_level = 0;
2090 t = lookup_name_current_level (name);
2091 /* Don't type check externs here when -traditional. This is so that
2092 code with conflicting declarations inside blocks will get warnings
2093 not errors. X11 for instance depends on this. */
2094 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
2096 t = IDENTIFIER_GLOBAL_VALUE (name);
2097 /* Type decls at global scope don't conflict with externs declared
2098 inside lexical blocks. */
2099 if (t && TREE_CODE (t) == TYPE_DECL)
2101 different_binding_level = 1;
2103 if (t != 0 && t == error_mark_node)
2104 /* error_mark_node is 0 for a while during initialization! */
2107 error_with_decl (x, "`%s' used prior to declaration");
2112 file = DECL_SOURCE_FILE (t);
2113 line = DECL_SOURCE_LINE (t);
2116 /* If this decl is `static' and an implicit decl was seen previously,
2117 warn. But don't complain if -traditional,
2118 since traditional compilers don't complain. */
2119 if (! flag_traditional && TREE_PUBLIC (name)
2120 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2121 sets this for all functions. */
2122 && ! TREE_PUBLIC (x)
2123 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2124 /* We used to warn also for explicit extern followed by static,
2125 but sometimes you need to do it that way. */
2126 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2128 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2129 IDENTIFIER_POINTER (name));
2130 pedwarn_with_file_and_line
2131 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2132 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2133 "previous declaration of `%s'",
2134 IDENTIFIER_POINTER (name));
2135 TREE_THIS_VOLATILE (name) = 1;
2138 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2140 if (TREE_CODE (t) == PARM_DECL)
2142 /* Don't allow more than one "real" duplicate
2143 of a forward parm decl. */
2144 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2150 /* If we are processing a typedef statement, generate a whole new
2151 ..._TYPE node (which will be just an variant of the existing
2152 ..._TYPE node with identical properties) and then install the
2153 TYPE_DECL node generated to represent the typedef name as the
2154 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2156 The whole point here is to end up with a situation where each
2157 and every ..._TYPE node the compiler creates will be uniquely
2158 associated with AT MOST one node representing a typedef name.
2159 This way, even though the compiler substitutes corresponding
2160 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2161 early on, later parts of the compiler can always do the reverse
2162 translation and get back the corresponding typedef name. For
2165 typedef struct S MY_TYPE;
2168 Later parts of the compiler might only know that `object' was of
2169 type `struct S' if it were not for code just below. With this
2170 code however, later parts of the compiler see something like:
2172 struct S' == struct S
2173 typedef struct S' MY_TYPE;
2176 And they can then deduce (from the node for type struct S') that
2177 the original object declaration was:
2181 Being able to do this is important for proper support of protoize,
2182 and also for generating precise symbolic debugging information
2183 which takes full account of the programmer's (typedef) vocabulary.
2185 Obviously, we don't want to generate a duplicate ..._TYPE node if
2186 the TYPE_DECL node that we are now processing really represents a
2187 standard built-in type.
2189 Since all standard types are effectively declared at line zero
2190 in the source file, we can easily check to see if we are working
2191 on a standard type by checking the current value of lineno. */
2193 if (TREE_CODE (x) == TYPE_DECL)
2195 if (DECL_SOURCE_LINE (x) == 0)
2197 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2198 TYPE_NAME (TREE_TYPE (x)) = x;
2200 else if (TREE_TYPE (x) != error_mark_node
2201 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2203 tree tt = TREE_TYPE (x);
2204 DECL_ORIGINAL_TYPE (x) = tt;
2205 tt = build_type_copy (tt);
2211 /* Multiple external decls of the same identifier ought to match.
2212 Check against both global declarations (when traditional) and out of
2213 scope (limbo) block level declarations.
2215 We get warnings about inline functions where they are defined.
2216 Avoid duplicate warnings where they are used. */
2217 if (TREE_PUBLIC (x) && ! DECL_INLINE (x))
2221 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2222 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2223 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2224 decl = IDENTIFIER_GLOBAL_VALUE (name);
2225 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2226 /* Decls in limbo are always extern, so no need to check that. */
2227 decl = IDENTIFIER_LIMBO_VALUE (name);
2231 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2232 /* If old decl is built-in, we already warned if we should. */
2233 && !DECL_BUILT_IN (decl))
2235 pedwarn_with_decl (x,
2236 "type mismatch with previous external decl");
2237 pedwarn_with_decl (decl, "previous external decl of `%s'");
2241 /* If a function has had an implicit declaration, and then is defined,
2242 make sure they are compatible. */
2244 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2245 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2246 && TREE_CODE (x) == FUNCTION_DECL
2247 && ! comptypes (TREE_TYPE (x),
2248 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2250 warning_with_decl (x, "type mismatch with previous implicit declaration");
2251 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2252 "previous implicit declaration of `%s'");
2255 /* In PCC-compatibility mode, extern decls of vars with no current decl
2256 take effect at top level no matter where they are. */
2257 if (flag_traditional && DECL_EXTERNAL (x)
2258 && lookup_name (name) == 0)
2260 tree type = TREE_TYPE (x);
2262 /* But don't do this if the type contains temporary nodes. */
2265 if (type == error_mark_node)
2267 if (! TREE_PERMANENT (type))
2269 warning_with_decl (x, "type of external `%s' is not global");
2270 /* By exiting the loop early, we leave TYPE nonzero,
2271 and thus prevent globalization of the decl. */
2274 else if (TREE_CODE (type) == FUNCTION_TYPE
2275 && TYPE_ARG_TYPES (type) != 0)
2276 /* The types might not be truly local,
2277 but the list of arg types certainly is temporary.
2278 Since prototypes are nontraditional,
2279 ok not to do the traditional thing. */
2281 type = TREE_TYPE (type);
2285 b = global_binding_level;
2288 /* This name is new in its binding level.
2289 Install the new declaration and return it. */
2290 if (b == global_binding_level)
2292 /* Install a global value. */
2294 /* If the first global decl has external linkage,
2295 warn if we later see static one. */
2296 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2297 TREE_PUBLIC (name) = 1;
2299 IDENTIFIER_GLOBAL_VALUE (name) = x;
2301 /* We no longer care about any previous block level declarations. */
2302 IDENTIFIER_LIMBO_VALUE (name) = 0;
2304 /* Don't forget if the function was used via an implicit decl. */
2305 if (IDENTIFIER_IMPLICIT_DECL (name)
2306 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2307 TREE_USED (x) = 1, TREE_USED (name) = 1;
2309 /* Don't forget if its address was taken in that way. */
2310 if (IDENTIFIER_IMPLICIT_DECL (name)
2311 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2312 TREE_ADDRESSABLE (x) = 1;
2314 /* Warn about mismatches against previous implicit decl. */
2315 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2316 /* If this real decl matches the implicit, don't complain. */
2317 && ! (TREE_CODE (x) == FUNCTION_DECL
2318 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2319 == integer_type_node)))
2320 pedwarn ("`%s' was previously implicitly declared to return `int'",
2321 IDENTIFIER_POINTER (name));
2323 /* If this decl is `static' and an `extern' was seen previously,
2324 that is erroneous. */
2325 if (TREE_PUBLIC (name)
2326 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2328 /* Okay to redeclare an ANSI built-in as static. */
2329 if (t != 0 && DECL_BUILT_IN (t))
2331 /* Okay to declare a non-ANSI built-in as anything. */
2332 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2334 /* Okay to have global type decl after an earlier extern
2335 declaration inside a lexical block. */
2336 else if (TREE_CODE (x) == TYPE_DECL)
2338 else if (IDENTIFIER_IMPLICIT_DECL (name))
2340 if (! TREE_THIS_VOLATILE (name))
2341 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2342 IDENTIFIER_POINTER (name));
2345 pedwarn ("`%s' was declared `extern' and later `static'",
2346 IDENTIFIER_POINTER (name));
2351 /* Here to install a non-global value. */
2352 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2353 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2354 IDENTIFIER_LOCAL_VALUE (name) = x;
2356 /* If this is an extern function declaration, see if we
2357 have a global definition or declaration for the function. */
2359 && DECL_EXTERNAL (x) && !DECL_INLINE (x)
2361 && TREE_CODE (x) == FUNCTION_DECL
2362 && TREE_CODE (oldglobal) == FUNCTION_DECL)
2364 /* We have one. Their types must agree. */
2365 if (! comptypes (TREE_TYPE (x),
2366 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2367 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2370 /* Inner extern decl is inline if global one is.
2371 Copy enough to really inline it. */
2372 if (DECL_INLINE (oldglobal))
2374 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2375 DECL_INITIAL (x) = (current_function_decl == oldglobal
2376 ? 0 : DECL_INITIAL (oldglobal));
2377 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2378 DECL_FRAME_SIZE (x) = DECL_FRAME_SIZE (oldglobal);
2379 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2380 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2381 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2382 DECL_ABSTRACT_ORIGIN (x) = DECL_ORIGIN (oldglobal);
2384 /* Inner extern decl is built-in if global one is. */
2385 if (DECL_BUILT_IN (oldglobal))
2387 DECL_BUILT_IN (x) = DECL_BUILT_IN (oldglobal);
2388 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2390 /* Keep the arg types from a file-scope fcn defn. */
2391 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2392 && DECL_INITIAL (oldglobal)
2393 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2394 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2398 #if 0 /* This case is probably sometimes the right thing to do. */
2399 /* If we have a local external declaration,
2400 then any file-scope declaration should not
2401 have been static. */
2402 if (oldlocal == 0 && oldglobal != 0
2403 && !TREE_PUBLIC (oldglobal)
2404 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2405 warning ("`%s' locally external but globally static",
2406 IDENTIFIER_POINTER (name));
2409 /* If we have a local external declaration,
2410 and no file-scope declaration has yet been seen,
2411 then if we later have a file-scope decl it must not be static. */
2413 && DECL_EXTERNAL (x)
2417 TREE_PUBLIC (name) = 1;
2419 /* Save this decl, so that we can do type checking against
2420 other decls after it falls out of scope.
2422 Only save it once. This prevents temporary decls created in
2423 expand_inline_function from being used here, since this
2424 will have been set when the inline function was parsed.
2425 It also helps give slightly better warnings. */
2426 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2427 IDENTIFIER_LIMBO_VALUE (name) = x;
2430 /* Warn if shadowing an argument at the top level of the body. */
2431 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2432 /* This warning doesn't apply to the parms of a nested fcn. */
2433 && ! current_binding_level->parm_flag
2434 /* Check that this is one level down from the parms. */
2435 && current_binding_level->level_chain->parm_flag
2436 /* Check that the decl being shadowed
2437 comes from the parm level, one level up. */
2438 && chain_member (oldlocal, current_binding_level->level_chain->names))
2440 if (TREE_CODE (oldlocal) == PARM_DECL)
2441 pedwarn ("declaration of `%s' shadows a parameter",
2442 IDENTIFIER_POINTER (name));
2444 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2445 IDENTIFIER_POINTER (name));
2448 /* Maybe warn if shadowing something else. */
2449 else if (warn_shadow && !DECL_EXTERNAL (x)
2450 /* No shadow warnings for internally generated vars. */
2451 && DECL_SOURCE_LINE (x) != 0
2452 /* No shadow warnings for vars made for inlining. */
2453 && ! DECL_FROM_INLINE (x))
2455 char *id = IDENTIFIER_POINTER (name);
2457 if (TREE_CODE (x) == PARM_DECL
2458 && current_binding_level->level_chain->parm_flag)
2459 /* Don't warn about the parm names in function declarator
2460 within a function declarator.
2461 It would be nice to avoid warning in any function
2462 declarator in a declaration, as opposed to a definition,
2463 but there is no way to tell it's not a definition. */
2465 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2466 warning ("declaration of `%s' shadows a parameter", id);
2467 else if (oldlocal != 0)
2468 warning ("declaration of `%s' shadows previous local", id);
2469 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2470 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2471 warning ("declaration of `%s' shadows global declaration", id);
2474 /* If storing a local value, there may already be one (inherited).
2475 If so, record it for restoration when this binding level ends. */
2477 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2480 /* Keep count of variables in this level with incomplete type. */
2481 if (TYPE_SIZE (TREE_TYPE (x)) == 0)
2485 /* Put decls on list in reverse order.
2486 We will reverse them later if necessary. */
2487 TREE_CHAIN (x) = b->names;
2493 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2496 pushdecl_top_level (x)
2500 register struct binding_level *b = current_binding_level;
2502 current_binding_level = global_binding_level;
2504 current_binding_level = b;
2508 /* Generate an implicit declaration for identifier FUNCTIONID
2509 as a function of type int (). Print a warning if appropriate. */
2512 implicitly_declare (functionid)
2516 int traditional_warning = 0;
2517 /* Only one "implicit declaration" warning per identifier. */
2518 int implicit_warning;
2520 /* Save the decl permanently so we can warn if definition follows. */
2521 push_obstacks_nochange ();
2522 end_temporary_allocation ();
2524 /* We used to reuse an old implicit decl here,
2525 but this loses with inline functions because it can clobber
2526 the saved decl chains. */
2527 /* if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2528 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2530 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2532 /* Warn of implicit decl following explicit local extern decl.
2533 This is probably a program designed for traditional C. */
2534 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2535 traditional_warning = 1;
2537 /* Warn once of an implicit declaration. */
2538 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2540 DECL_EXTERNAL (decl) = 1;
2541 TREE_PUBLIC (decl) = 1;
2543 /* Record that we have an implicit decl and this is it. */
2544 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2546 /* ANSI standard says implicit declarations are in the innermost block.
2547 So we record the decl in the standard fashion.
2548 If flag_traditional is set, pushdecl does it top-level. */
2551 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2552 maybe_objc_check_decl (decl);
2554 rest_of_decl_compilation (decl, NULL_PTR, 0, 0);
2556 if (mesg_implicit_function_declaration && implicit_warning)
2558 if (mesg_implicit_function_declaration == 2)
2559 error ("implicit declaration of function `%s'",
2560 IDENTIFIER_POINTER (functionid));
2562 warning ("implicit declaration of function `%s'",
2563 IDENTIFIER_POINTER (functionid));
2565 else if (warn_traditional && traditional_warning)
2566 warning ("function `%s' was previously declared within a block",
2567 IDENTIFIER_POINTER (functionid));
2569 /* Write a record describing this implicit function declaration to the
2570 prototypes file (if requested). */
2572 gen_aux_info_record (decl, 0, 1, 0);
2579 /* Return zero if the declaration NEWDECL is valid
2580 when the declaration OLDDECL (assumed to be for the same name)
2581 has already been seen.
2582 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
2583 and 3 if it is a conflicting declaration. */
2586 redeclaration_error_message (newdecl, olddecl)
2587 tree newdecl, olddecl;
2589 if (TREE_CODE (newdecl) == TYPE_DECL)
2591 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2593 /* pushdecl creates distinct types for TYPE_DECLs by calling
2594 build_type_copy, so the above comparison generally fails. We do
2595 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2596 is equivalent to what this code used to do before the build_type_copy
2597 call. The variant type distinction should not matter for traditional
2598 code, because it doesn't have type qualifiers. */
2599 if (flag_traditional
2600 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
2602 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2606 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2608 /* Declarations of functions can insist on internal linkage
2609 but they can't be inconsistent with internal linkage,
2610 so there can be no error on that account.
2611 However defining the same name twice is no good. */
2612 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2613 /* However, defining once as extern inline and a second
2614 time in another way is ok. */
2615 && !(DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2616 && !(DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2620 else if (current_binding_level == global_binding_level)
2622 /* Objects declared at top level: */
2623 /* If at least one is a reference, it's ok. */
2624 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2626 /* Reject two definitions. */
2627 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2629 /* Now we have two tentative defs, or one tentative and one real def. */
2630 /* Insist that the linkage match. */
2631 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2635 else if (current_binding_level->parm_flag
2636 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2640 /* Newdecl has block scope. If olddecl has block scope also, then
2641 reject two definitions, and reject a definition together with an
2642 external reference. Otherwise, it is OK, because newdecl must
2643 be an extern reference to olddecl. */
2644 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2645 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2651 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2652 Create one if none exists so far for the current function.
2653 This function is called for both label definitions and label references. */
2659 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2661 if (current_function_decl == 0)
2663 error ("label %s referenced outside of any function",
2664 IDENTIFIER_POINTER (id));
2668 /* Use a label already defined or ref'd with this name. */
2671 /* But not if it is inherited and wasn't declared to be inheritable. */
2672 if (DECL_CONTEXT (decl) != current_function_decl
2673 && ! C_DECLARED_LABEL_FLAG (decl))
2674 return shadow_label (id);
2678 decl = build_decl (LABEL_DECL, id, void_type_node);
2680 /* Make sure every label has an rtx. */
2683 /* A label not explicitly declared must be local to where it's ref'd. */
2684 DECL_CONTEXT (decl) = current_function_decl;
2686 DECL_MODE (decl) = VOIDmode;
2688 /* Say where one reference is to the label,
2689 for the sake of the error if it is not defined. */
2690 DECL_SOURCE_LINE (decl) = lineno;
2691 DECL_SOURCE_FILE (decl) = input_filename;
2693 IDENTIFIER_LABEL_VALUE (id) = decl;
2695 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2700 /* Make a label named NAME in the current function,
2701 shadowing silently any that may be inherited from containing functions
2702 or containing scopes.
2704 Note that valid use, if the label being shadowed
2705 comes from another scope in the same function,
2706 requires calling declare_nonlocal_label right away. */
2712 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2718 /* Check to make sure that the label hasn't already been declared
2719 at this label scope */
2720 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2721 if (TREE_VALUE (dup) == decl)
2723 error ("duplicate label declaration `%s'",
2724 IDENTIFIER_POINTER (name));
2725 error_with_decl (TREE_VALUE (dup),
2726 "this is a previous declaration");
2727 /* Just use the previous declaration. */
2728 return lookup_label (name);
2731 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2732 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2735 return lookup_label (name);
2738 /* Define a label, specifying the location in the source file.
2739 Return the LABEL_DECL node for the label, if the definition is valid.
2740 Otherwise return 0. */
2743 define_label (filename, line, name)
2748 tree decl = lookup_label (name);
2750 /* If label with this name is known from an outer context, shadow it. */
2751 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2753 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2754 IDENTIFIER_LABEL_VALUE (name) = 0;
2755 decl = lookup_label (name);
2758 if (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 /* Create the predefined scalar types of C,
2932 and some nodes representing standard constants (0, 1, (void *) 0).
2933 Initialize the global binding level.
2934 Make definitions for built-in primitive functions. */
2937 init_decl_processing ()
2939 register tree endlink;
2940 tree ptr_ftype_void, ptr_ftype_ptr;
2941 int wchar_type_size;
2942 tree array_domain_type;
2944 current_function_decl = NULL;
2945 named_labels = NULL;
2946 current_binding_level = NULL_BINDING_LEVEL;
2947 free_binding_level = NULL_BINDING_LEVEL;
2948 pushlevel (0); /* make the binding_level structure for global names */
2949 global_binding_level = current_binding_level;
2951 /* Define `int' and `char' first so that dbx will output them first. */
2953 integer_type_node = make_signed_type (INT_TYPE_SIZE);
2954 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_INT],
2955 integer_type_node));
2957 /* Define `char', which is like either `signed char' or `unsigned char'
2958 but not the same as either. */
2962 ? make_signed_type (CHAR_TYPE_SIZE)
2963 : make_unsigned_type (CHAR_TYPE_SIZE));
2964 pushdecl (build_decl (TYPE_DECL, get_identifier ("char"),
2967 long_integer_type_node = make_signed_type (LONG_TYPE_SIZE);
2968 pushdecl (build_decl (TYPE_DECL, get_identifier ("long int"),
2969 long_integer_type_node));
2971 unsigned_type_node = make_unsigned_type (INT_TYPE_SIZE);
2972 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned int"),
2973 unsigned_type_node));
2975 long_unsigned_type_node = make_unsigned_type (LONG_TYPE_SIZE);
2976 pushdecl (build_decl (TYPE_DECL, get_identifier ("long unsigned int"),
2977 long_unsigned_type_node));
2979 long_long_integer_type_node = make_signed_type (LONG_LONG_TYPE_SIZE);
2980 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long int"),
2981 long_long_integer_type_node));
2983 long_long_unsigned_type_node = make_unsigned_type (LONG_LONG_TYPE_SIZE);
2984 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long unsigned int"),
2985 long_long_unsigned_type_node));
2987 short_integer_type_node = make_signed_type (SHORT_TYPE_SIZE);
2988 pushdecl (build_decl (TYPE_DECL, get_identifier ("short int"),
2989 short_integer_type_node));
2991 short_unsigned_type_node = make_unsigned_type (SHORT_TYPE_SIZE);
2992 pushdecl (build_decl (TYPE_DECL, get_identifier ("short unsigned int"),
2993 short_unsigned_type_node));
2995 /* `unsigned long' is the standard type for sizeof.
2996 Traditionally, use a signed type.
2997 Note that stddef.h uses `unsigned long',
2998 and this must agree, even if long and int are the same size. */
3000 (TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE))));
3001 if (flag_traditional && TREE_UNSIGNED (sizetype))
3002 set_sizetype (signed_type (sizetype));
3005 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE)));
3007 error_mark_node = make_node (ERROR_MARK);
3008 TREE_TYPE (error_mark_node) = error_mark_node;
3010 /* Define both `signed char' and `unsigned char'. */
3011 signed_char_type_node = make_signed_type (CHAR_TYPE_SIZE);
3012 pushdecl (build_decl (TYPE_DECL, get_identifier ("signed char"),
3013 signed_char_type_node));
3015 unsigned_char_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
3016 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned char"),
3017 unsigned_char_type_node));
3019 /* Create the widest literal types. */
3020 widest_integer_literal_type_node = make_signed_type (HOST_BITS_PER_WIDE_INT * 2);
3021 pushdecl (build_decl (TYPE_DECL, NULL_TREE,
3022 widest_integer_literal_type_node));
3024 widest_unsigned_literal_type_node = make_unsigned_type (HOST_BITS_PER_WIDE_INT * 2);
3025 pushdecl (build_decl (TYPE_DECL, NULL_TREE,
3026 widest_unsigned_literal_type_node));
3028 /* Now all the integer mode types. */
3029 intQI_type_node = make_signed_type (GET_MODE_BITSIZE (QImode));
3030 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intQI_type_node));
3032 intHI_type_node = make_signed_type (GET_MODE_BITSIZE (HImode));
3033 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intHI_type_node));
3035 intSI_type_node = make_signed_type (GET_MODE_BITSIZE (SImode));
3036 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intSI_type_node));
3038 intDI_type_node = make_signed_type (GET_MODE_BITSIZE (DImode));
3039 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
3041 #if HOST_BITS_PER_WIDE_INT >= 64
3042 intTI_type_node = make_signed_type (GET_MODE_BITSIZE (TImode));
3043 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intTI_type_node));
3046 unsigned_intQI_type_node = make_unsigned_type (GET_MODE_BITSIZE (QImode));
3047 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node));
3049 unsigned_intHI_type_node = make_unsigned_type (GET_MODE_BITSIZE (HImode));
3050 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intHI_type_node));
3052 unsigned_intSI_type_node = make_unsigned_type (GET_MODE_BITSIZE (SImode));
3053 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intSI_type_node));
3055 unsigned_intDI_type_node = make_unsigned_type (GET_MODE_BITSIZE (DImode));
3056 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node));
3058 #if HOST_BITS_PER_WIDE_INT >= 64
3059 unsigned_intTI_type_node = make_unsigned_type (GET_MODE_BITSIZE (TImode));
3060 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intTI_type_node));
3063 float_type_node = make_node (REAL_TYPE);
3064 TYPE_PRECISION (float_type_node) = FLOAT_TYPE_SIZE;
3065 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_FLOAT],
3067 layout_type (float_type_node);
3069 double_type_node = make_node (REAL_TYPE);
3070 if (flag_short_double)
3071 TYPE_PRECISION (double_type_node) = FLOAT_TYPE_SIZE;
3073 TYPE_PRECISION (double_type_node) = DOUBLE_TYPE_SIZE;
3074 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_DOUBLE],
3076 layout_type (double_type_node);
3078 long_double_type_node = make_node (REAL_TYPE);
3079 TYPE_PRECISION (long_double_type_node) = LONG_DOUBLE_TYPE_SIZE;
3080 pushdecl (build_decl (TYPE_DECL, get_identifier ("long double"),
3081 long_double_type_node));
3082 layout_type (long_double_type_node);
3084 complex_integer_type_node = make_node (COMPLEX_TYPE);
3085 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex int"),
3086 complex_integer_type_node));
3087 TREE_TYPE (complex_integer_type_node) = integer_type_node;
3088 layout_type (complex_integer_type_node);
3090 complex_float_type_node = make_node (COMPLEX_TYPE);
3091 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex float"),
3092 complex_float_type_node));
3093 TREE_TYPE (complex_float_type_node) = float_type_node;
3094 layout_type (complex_float_type_node);
3096 complex_double_type_node = make_node (COMPLEX_TYPE);
3097 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex double"),
3098 complex_double_type_node));
3099 TREE_TYPE (complex_double_type_node) = double_type_node;
3100 layout_type (complex_double_type_node);
3102 complex_long_double_type_node = make_node (COMPLEX_TYPE);
3103 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex long double"),
3104 complex_long_double_type_node));
3105 TREE_TYPE (complex_long_double_type_node) = long_double_type_node;
3106 layout_type (complex_long_double_type_node);
3109 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (WCHAR_TYPE)));
3110 wchar_type_size = TYPE_PRECISION (wchar_type_node);
3111 signed_wchar_type_node = signed_type (wchar_type_node);
3112 unsigned_wchar_type_node = unsigned_type (wchar_type_node);
3114 integer_zero_node = build_int_2 (0, 0);
3115 TREE_TYPE (integer_zero_node) = integer_type_node;
3116 integer_one_node = build_int_2 (1, 0);
3117 TREE_TYPE (integer_one_node) = integer_type_node;
3119 boolean_type_node = integer_type_node;
3120 boolean_true_node = integer_one_node;
3121 boolean_false_node = integer_zero_node;
3123 size_zero_node = build_int_2 (0, 0);
3124 TREE_TYPE (size_zero_node) = sizetype;
3125 size_one_node = build_int_2 (1, 0);
3126 TREE_TYPE (size_one_node) = sizetype;
3128 void_type_node = make_node (VOID_TYPE);
3129 pushdecl (build_decl (TYPE_DECL,
3130 ridpointers[(int) RID_VOID], void_type_node));
3131 layout_type (void_type_node); /* Uses integer_zero_node */
3132 /* We are not going to have real types in C with less than byte alignment,
3133 so we might as well not have any types that claim to have it. */
3134 TYPE_ALIGN (void_type_node) = BITS_PER_UNIT;
3136 null_pointer_node = build_int_2 (0, 0);
3137 TREE_TYPE (null_pointer_node) = build_pointer_type (void_type_node);
3138 layout_type (TREE_TYPE (null_pointer_node));
3140 string_type_node = build_pointer_type (char_type_node);
3141 const_string_type_node
3142 = build_pointer_type (build_type_variant (char_type_node, 1, 0));
3144 /* Make a type to be the domain of a few array types
3145 whose domains don't really matter.
3146 200 is small enough that it always fits in size_t
3147 and large enough that it can hold most function names for the
3148 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
3149 array_domain_type = build_index_type (build_int_2 (200, 0));
3151 /* make a type for arrays of characters.
3152 With luck nothing will ever really depend on the length of this
3154 char_array_type_node
3155 = build_array_type (char_type_node, array_domain_type);
3156 /* Likewise for arrays of ints. */
3158 = build_array_type (integer_type_node, array_domain_type);
3159 /* This is for wide string constants. */
3160 wchar_array_type_node
3161 = build_array_type (wchar_type_node, array_domain_type);
3163 void_list_node = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
3165 default_function_type
3166 = build_function_type (integer_type_node, NULL_TREE);
3168 ptr_type_node = build_pointer_type (void_type_node);
3170 = build_pointer_type (build_type_variant (void_type_node, 1, 0));
3172 c_common_nodes_and_builtins (0, flag_no_builtin, flag_no_nonansi_builtin);
3174 endlink = void_list_node;
3175 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
3177 = build_function_type (ptr_type_node,
3178 tree_cons (NULL_TREE, ptr_type_node, endlink));
3180 builtin_function ("__builtin_aggregate_incoming_address",
3181 build_function_type (ptr_type_node, NULL_TREE),
3182 BUILT_IN_AGGREGATE_INCOMING_ADDRESS, NULL_PTR);
3184 /* Hooks for the DWARF 2 __throw routine. */
3185 builtin_function ("__builtin_unwind_init",
3186 build_function_type (void_type_node, endlink),
3187 BUILT_IN_UNWIND_INIT, NULL_PTR);
3188 builtin_function ("__builtin_dwarf_cfa", ptr_ftype_void,
3189 BUILT_IN_DWARF_CFA, NULL_PTR);
3190 builtin_function ("__builtin_dwarf_fp_regnum",
3191 build_function_type (unsigned_type_node, endlink),
3192 BUILT_IN_DWARF_FP_REGNUM, NULL_PTR);
3193 builtin_function ("__builtin_dwarf_reg_size", int_ftype_int,
3194 BUILT_IN_DWARF_REG_SIZE, NULL_PTR);
3195 builtin_function ("__builtin_frob_return_addr", ptr_ftype_ptr,
3196 BUILT_IN_FROB_RETURN_ADDR, NULL_PTR);
3197 builtin_function ("__builtin_extract_return_addr", ptr_ftype_ptr,
3198 BUILT_IN_EXTRACT_RETURN_ADDR, NULL_PTR);
3200 ("__builtin_eh_return",
3201 build_function_type (void_type_node,
3202 tree_cons (NULL_TREE, ptr_type_node,
3203 tree_cons (NULL_TREE,
3204 type_for_mode (ptr_mode, 0),
3205 tree_cons (NULL_TREE,
3208 BUILT_IN_EH_RETURN, NULL_PTR);
3210 pedantic_lvalues = pedantic;
3212 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
3213 declare_function_name ();
3215 start_identifier_warnings ();
3217 /* Prepare to check format strings against argument lists. */
3218 init_function_format_info ();
3222 incomplete_decl_finalize_hook = finish_incomplete_decl;
3224 lang_get_alias_set = c_get_alias_set;
3227 /* Return a definition for a builtin function named NAME and whose data type
3228 is TYPE. TYPE should be a function type with argument types.
3229 FUNCTION_CODE tells later passes how to compile calls to this function.
3230 See tree.h for its possible values.
3232 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3233 the name to be called if we can't opencode the function. */
3236 builtin_function (name, type, function_code, library_name)
3239 enum built_in_function function_code;
3240 const char *library_name;
3242 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3243 DECL_EXTERNAL (decl) = 1;
3244 TREE_PUBLIC (decl) = 1;
3245 /* If -traditional, permit redefining a builtin function any way you like.
3246 (Though really, if the program redefines these functions,
3247 it probably won't work right unless compiled with -fno-builtin.) */
3248 if (flag_traditional && name[0] != '_')
3249 DECL_BUILT_IN_NONANSI (decl) = 1;
3251 DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
3252 make_decl_rtl (decl, NULL_PTR, 1);
3254 if (function_code != NOT_BUILT_IN)
3256 DECL_BUILT_IN (decl) = 1;
3257 DECL_FUNCTION_CODE (decl) = function_code;
3259 /* Warn if a function in the namespace for users
3260 is used without an occasion to consider it declared. */
3261 if (name[0] != '_' || name[1] != '_')
3262 C_DECL_ANTICIPATED (decl) = 1;
3267 /* Called when a declaration is seen that contains no names to declare.
3268 If its type is a reference to a structure, union or enum inherited
3269 from a containing scope, shadow that tag name for the current scope
3270 with a forward reference.
3271 If its type defines a new named structure or union
3272 or defines an enum, it is valid but we need not do anything here.
3273 Otherwise, it is an error. */
3276 shadow_tag (declspecs)
3279 shadow_tag_warned (declspecs, 0);
3283 shadow_tag_warned (declspecs, warned)
3286 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3293 pending_invalid_xref = 0;
3295 /* Remove the attributes from declspecs, since they will confuse the
3297 split_specs_attrs (declspecs, &specs, &attrs);
3299 for (link = specs; link; link = TREE_CHAIN (link))
3301 register tree value = TREE_VALUE (link);
3302 register enum tree_code code = TREE_CODE (value);
3304 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3305 /* Used to test also that TYPE_SIZE (value) != 0.
3306 That caused warning for `struct foo;' at top level in the file. */
3308 register tree name = lookup_tag_reverse (value);
3315 if (warned != 1 && code != ENUMERAL_TYPE)
3316 /* Empty unnamed enum OK */
3318 pedwarn ("unnamed struct/union that defines no instances");
3324 t = lookup_tag (code, name, current_binding_level, 1);
3328 t = make_node (code);
3335 if (!warned && ! in_system_header)
3337 warning ("useless keyword or type name in empty declaration");
3344 error ("two types specified in one empty declaration");
3349 pedwarn ("empty declaration");
3353 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3356 groktypename (typename)
3359 if (TREE_CODE (typename) != TREE_LIST)
3361 return grokdeclarator (TREE_VALUE (typename),
3362 TREE_PURPOSE (typename),
3366 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3369 groktypename_in_parm_context (typename)
3372 if (TREE_CODE (typename) != TREE_LIST)
3374 return grokdeclarator (TREE_VALUE (typename),
3375 TREE_PURPOSE (typename),
3379 /* Decode a declarator in an ordinary declaration or data definition.
3380 This is called as soon as the type information and variable name
3381 have been parsed, before parsing the initializer if any.
3382 Here we create the ..._DECL node, fill in its type,
3383 and put it on the list of decls for the current context.
3384 The ..._DECL node is returned as the value.
3386 Exception: for arrays where the length is not specified,
3387 the type is left null, to be filled in by `finish_decl'.
3389 Function definitions do not come here; they go to start_function
3390 instead. However, external and forward declarations of functions
3391 do go through here. Structure field declarations are done by
3392 grokfield and not through here. */
3394 /* Set this to zero to debug not using the temporary obstack
3395 to parse initializers. */
3396 int debug_temp_inits = 1;
3399 start_decl (declarator, declspecs, initialized, attributes, prefix_attributes)
3400 tree declarator, declspecs;
3402 tree attributes, prefix_attributes;
3404 register tree decl = grokdeclarator (declarator, declspecs,
3405 NORMAL, initialized);
3407 int init_written = initialized;
3409 /* The corresponding pop_obstacks is in finish_decl. */
3410 push_obstacks_nochange ();
3412 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3413 && !strcmp (IDENTIFIER_POINTER (DECL_NAME (decl)), "main"))
3414 warning_with_decl (decl, "`%s' is usually a function");
3417 /* Is it valid for this decl to have an initializer at all?
3418 If not, set INITIALIZED to zero, which will indirectly
3419 tell `finish_decl' to ignore the initializer once it is parsed. */
3420 switch (TREE_CODE (decl))
3423 /* typedef foo = bar means give foo the same type as bar.
3424 We haven't parsed bar yet, so `finish_decl' will fix that up.
3425 Any other case of an initialization in a TYPE_DECL is an error. */
3426 if (pedantic || list_length (declspecs) > 1)
3428 error ("typedef `%s' is initialized",
3429 IDENTIFIER_POINTER (DECL_NAME (decl)));
3435 error ("function `%s' is initialized like a variable",
3436 IDENTIFIER_POINTER (DECL_NAME (decl)));
3441 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3442 error ("parameter `%s' is initialized",
3443 IDENTIFIER_POINTER (DECL_NAME (decl)));
3448 /* Don't allow initializations for incomplete types
3449 except for arrays which might be completed by the initialization. */
3450 if (TYPE_SIZE (TREE_TYPE (decl)) != 0)
3452 /* A complete type is ok if size is fixed. */
3454 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3455 || C_DECL_VARIABLE_SIZE (decl))
3457 error ("variable-sized object may not be initialized");
3461 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3463 error ("variable `%s' has initializer but incomplete type",
3464 IDENTIFIER_POINTER (DECL_NAME (decl)));
3467 else if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl))) == 0)
3469 error ("elements of array `%s' have incomplete type",
3470 IDENTIFIER_POINTER (DECL_NAME (decl)));
3477 #if 0 /* Seems redundant with grokdeclarator. */
3478 if (current_binding_level != global_binding_level
3479 && DECL_EXTERNAL (decl)
3480 && TREE_CODE (decl) != FUNCTION_DECL)
3481 warning ("declaration of `%s' has `extern' and is initialized",
3482 IDENTIFIER_POINTER (DECL_NAME (decl)));
3484 DECL_EXTERNAL (decl) = 0;
3485 if (current_binding_level == global_binding_level)
3486 TREE_STATIC (decl) = 1;
3488 /* Tell `pushdecl' this is an initialized decl
3489 even though we don't yet have the initializer expression.
3490 Also tell `finish_decl' it may store the real initializer. */
3491 DECL_INITIAL (decl) = error_mark_node;
3494 /* If this is a function declaration, write a record describing it to the
3495 prototypes file (if requested). */
3497 if (TREE_CODE (decl) == FUNCTION_DECL)
3498 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3500 /* ANSI specifies that a tentative definition which is not merged with
3501 a non-tentative definition behaves exactly like a definition with an
3502 initializer equal to zero. (Section 3.7.2)
3503 -fno-common gives strict ANSI behavior. Usually you don't want it.
3504 This matters only for variables with external linkage. */
3505 if (! flag_no_common || ! TREE_PUBLIC (decl))
3506 DECL_COMMON (decl) = 1;
3508 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
3509 SET_DEFAULT_DECL_ATTRIBUTES (decl, attributes);
3512 /* Set attributes here so if duplicate decl, will have proper attributes. */
3513 decl_attributes (decl, attributes, prefix_attributes);
3515 /* Add this decl to the current binding level.
3516 TEM may equal DECL or it may be a previous decl of the same name. */
3517 tem = pushdecl (decl);
3519 /* For a local variable, define the RTL now. */
3520 if (current_binding_level != global_binding_level
3521 /* But not if this is a duplicate decl
3522 and we preserved the rtl from the previous one
3523 (which may or may not happen). */
3524 && DECL_RTL (tem) == 0)
3526 if (TYPE_SIZE (TREE_TYPE (tem)) != 0)
3528 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3529 && DECL_INITIAL (tem) != 0)
3535 /* When parsing and digesting the initializer,
3536 use temporary storage. Do this even if we will ignore the value. */
3537 if (current_binding_level == global_binding_level && debug_temp_inits)
3538 temporary_allocation ();
3544 /* Finish processing of a declaration;
3545 install its initial value.
3546 If the length of an array type is not known before,
3547 it must be determined now, from the initial value, or it is an error. */
3550 finish_decl (decl, init, asmspec_tree)
3554 register tree type = TREE_TYPE (decl);
3555 int was_incomplete = (DECL_SIZE (decl) == 0);
3556 int temporary = allocation_temporary_p ();
3559 /* If a name was specified, get the string. */
3561 asmspec = TREE_STRING_POINTER (asmspec_tree);
3563 /* If `start_decl' didn't like having an initialization, ignore it now. */
3565 if (init != 0 && DECL_INITIAL (decl) == 0)
3567 /* Don't crash if parm is initialized. */
3568 if (TREE_CODE (decl) == PARM_DECL)
3571 if (ITERATOR_P (decl))
3574 error_with_decl (decl, "iterator has no initial value");
3576 init = save_expr (init);
3581 if (TREE_CODE (decl) != TYPE_DECL)
3582 store_init_value (decl, init);
3585 /* typedef foo = bar; store the type of bar as the type of foo. */
3586 TREE_TYPE (decl) = TREE_TYPE (init);
3587 DECL_INITIAL (decl) = init = 0;
3591 /* Pop back to the obstack that is current for this binding level.
3592 This is because MAXINDEX, rtl, etc. to be made below
3593 must go in the permanent obstack. But don't discard the
3594 temporary data yet. */
3596 #if 0 /* pop_obstacks was near the end; this is what was here. */
3597 if (current_binding_level == global_binding_level && temporary)
3598 end_temporary_allocation ();
3601 /* Deduce size of array from initialization, if not already known */
3603 if (TREE_CODE (type) == ARRAY_TYPE
3604 && TYPE_DOMAIN (type) == 0
3605 && TREE_CODE (decl) != TYPE_DECL)
3608 = (TREE_STATIC (decl)
3609 /* Even if pedantic, an external linkage array
3610 may have incomplete type at first. */
3611 ? pedantic && !TREE_PUBLIC (decl)
3612 : !DECL_EXTERNAL (decl));
3614 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3616 /* Get the completed type made by complete_array_type. */
3617 type = TREE_TYPE (decl);
3620 error_with_decl (decl, "initializer fails to determine size of `%s'");
3625 error_with_decl (decl, "array size missing in `%s'");
3626 /* If a `static' var's size isn't known,
3627 make it extern as well as static, so it does not get
3629 If it is not `static', then do not mark extern;
3630 finish_incomplete_decl will give it a default size
3631 and it will get allocated. */
3632 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3633 DECL_EXTERNAL (decl) = 1;
3636 /* TYPE_MAX_VALUE is always one less than the number of elements
3637 in the array, because we start counting at zero. Therefore,
3638 warn only if the value is less than zero. */
3639 if (pedantic && TYPE_DOMAIN (type) != 0
3640 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3641 error_with_decl (decl, "zero or negative size array `%s'");
3643 layout_decl (decl, 0);
3646 if (TREE_CODE (decl) == VAR_DECL)
3648 if (DECL_SIZE (decl) == 0
3649 && TYPE_SIZE (TREE_TYPE (decl)) != 0)
3650 layout_decl (decl, 0);
3652 if (DECL_SIZE (decl) == 0
3653 && (TREE_STATIC (decl)
3655 /* A static variable with an incomplete type
3656 is an error if it is initialized.
3657 Also if it is not file scope.
3658 Otherwise, let it through, but if it is not `extern'
3659 then it may cause an error message later. */
3660 /* A duplicate_decls call could have changed an extern
3661 declaration into a file scope one. This can be detected
3662 by TREE_ASM_WRITTEN being set. */
3663 (DECL_INITIAL (decl) != 0
3664 || (DECL_CONTEXT (decl) != 0 && ! TREE_ASM_WRITTEN (decl)))
3666 /* An automatic variable with an incomplete type
3668 !DECL_EXTERNAL (decl)))
3670 error_with_decl (decl, "storage size of `%s' isn't known");
3671 TREE_TYPE (decl) = error_mark_node;
3674 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3675 && DECL_SIZE (decl) != 0)
3677 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3678 constant_expression_warning (DECL_SIZE (decl));
3680 error_with_decl (decl, "storage size of `%s' isn't constant");
3683 if (TREE_USED (type))
3684 TREE_USED (decl) = 1;
3687 /* If this is a function and an assembler name is specified, it isn't
3688 builtin any more. Also reset DECL_RTL so we can give it its new
3690 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3692 DECL_BUILT_IN (decl) = 0;
3693 DECL_RTL (decl) = 0;
3696 /* Output the assembler code and/or RTL code for variables and functions,
3697 unless the type is an undefined structure or union.
3698 If not, it will get done when the type is completed. */
3700 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3702 if ((flag_traditional || TREE_PERMANENT (decl))
3703 && allocation_temporary_p ())
3705 push_obstacks_nochange ();
3706 end_temporary_allocation ();
3707 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3708 maybe_objc_check_decl (decl);
3709 rest_of_decl_compilation (decl, asmspec,
3710 (DECL_CONTEXT (decl) == 0
3711 || TREE_ASM_WRITTEN (decl)),
3717 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3718 maybe_objc_check_decl (decl);
3719 rest_of_decl_compilation (decl, asmspec, DECL_CONTEXT (decl) == 0,
3722 if (DECL_CONTEXT (decl) != 0)
3724 /* Recompute the RTL of a local array now
3725 if it used to be an incomplete type. */
3727 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3729 /* If we used it already as memory, it must stay in memory. */
3730 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3731 /* If it's still incomplete now, no init will save it. */
3732 if (DECL_SIZE (decl) == 0)
3733 DECL_INITIAL (decl) = 0;
3736 /* Compute and store the initial value. */
3737 if (TREE_CODE (decl) != FUNCTION_DECL)
3738 expand_decl_init (decl);
3742 if (TREE_CODE (decl) == TYPE_DECL)
3744 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3745 maybe_objc_check_decl (decl);
3746 rest_of_decl_compilation (decl, NULL_PTR, DECL_CONTEXT (decl) == 0,
3750 /* ??? After 2.3, test (init != 0) instead of TREE_CODE. */
3751 /* This test used to include TREE_PERMANENT, however, we have the same
3752 problem with initializers at the function level. Such initializers get
3753 saved until the end of the function on the momentary_obstack. */
3754 if (!(TREE_CODE (decl) == FUNCTION_DECL && DECL_INLINE (decl))
3756 /* DECL_INITIAL is not defined in PARM_DECLs, since it shares
3757 space with DECL_ARG_TYPE. */
3758 && TREE_CODE (decl) != PARM_DECL)
3760 /* We need to remember that this array HAD an initialization,
3761 but discard the actual temporary nodes,
3762 since we can't have a permanent node keep pointing to them. */
3763 /* We make an exception for inline functions, since it's
3764 normal for a local extern redeclaration of an inline function
3765 to have a copy of the top-level decl's DECL_INLINE. */
3766 if (DECL_INITIAL (decl) != 0 && DECL_INITIAL (decl) != error_mark_node)
3768 /* If this is a const variable, then preserve the
3769 initializer instead of discarding it so that we can optimize
3770 references to it. */
3771 /* This test used to include TREE_STATIC, but this won't be set
3772 for function level initializers. */
3773 if (TREE_READONLY (decl) || ITERATOR_P (decl))
3775 preserve_initializer ();
3776 /* Hack? Set the permanent bit for something that is permanent,
3777 but not on the permanent obstack, so as to convince
3778 output_constant_def to make its rtl on the permanent
3780 TREE_PERMANENT (DECL_INITIAL (decl)) = 1;
3782 /* The initializer and DECL must have the same (or equivalent
3783 types), but if the initializer is a STRING_CST, its type
3784 might not be on the right obstack, so copy the type
3786 TREE_TYPE (DECL_INITIAL (decl)) = type;
3789 DECL_INITIAL (decl) = error_mark_node;
3793 /* If requested, warn about definitions of large data objects. */
3795 if (warn_larger_than
3796 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL)
3797 && !DECL_EXTERNAL (decl))
3799 register tree decl_size = DECL_SIZE (decl);
3801 if (decl_size && TREE_CODE (decl_size) == INTEGER_CST)
3803 unsigned units = TREE_INT_CST_LOW(decl_size) / BITS_PER_UNIT;
3805 if (units > larger_than_size)
3806 warning_with_decl (decl, "size of `%s' is %u bytes", units);
3811 /* Resume permanent allocation, if not within a function. */
3812 /* The corresponding push_obstacks_nochange is in start_decl,
3813 and in push_parm_decl and in grokfield. */
3817 /* If we have gone back from temporary to permanent allocation,
3818 actually free the temporary space that we no longer need. */
3819 if (temporary && !allocation_temporary_p ())
3820 permanent_allocation (0);
3822 /* At the end of a declaration, throw away any variable type sizes
3823 of types defined inside that declaration. There is no use
3824 computing them in the following function definition. */
3825 if (current_binding_level == global_binding_level)
3826 get_pending_sizes ();
3829 /* If DECL has a cleanup, build and return that cleanup here.
3830 This is a callback called by expand_expr. */
3833 maybe_build_cleanup (decl)
3834 tree decl ATTRIBUTE_UNUSED;
3836 /* There are no cleanups in C. */
3840 /* Given a parsed parameter declaration,
3841 decode it into a PARM_DECL and push that on the current binding level.
3842 Also, for the sake of forward parm decls,
3843 record the given order of parms in `parm_order'. */
3846 push_parm_decl (parm)
3850 int old_immediate_size_expand = immediate_size_expand;
3851 /* Don't try computing parm sizes now -- wait till fn is called. */
3852 immediate_size_expand = 0;
3854 /* The corresponding pop_obstacks is in finish_decl. */
3855 push_obstacks_nochange ();
3857 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3858 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3859 decl_attributes (decl, TREE_VALUE (TREE_VALUE (parm)),
3860 TREE_PURPOSE (TREE_VALUE (parm)));
3863 if (DECL_NAME (decl))
3866 olddecl = lookup_name (DECL_NAME (decl));
3867 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3868 pedwarn_with_decl (decl, "ANSI C forbids parameter `%s' shadowing typedef");
3872 decl = pushdecl (decl);
3874 immediate_size_expand = old_immediate_size_expand;
3876 current_binding_level->parm_order
3877 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3879 /* Add this decl to the current binding level. */
3880 finish_decl (decl, NULL_TREE, NULL_TREE);
3883 /* Clear the given order of parms in `parm_order'.
3884 Used at start of parm list,
3885 and also at semicolon terminating forward decls. */
3890 current_binding_level->parm_order = NULL_TREE;
3893 /* Make TYPE a complete type based on INITIAL_VALUE.
3894 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3895 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3898 complete_array_type (type, initial_value, do_default)
3903 register tree maxindex = NULL_TREE;
3908 /* Note MAXINDEX is really the maximum index,
3909 one less than the size. */
3910 if (TREE_CODE (initial_value) == STRING_CST)
3913 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3914 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3917 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3919 tree elts = CONSTRUCTOR_ELTS (initial_value);
3920 maxindex = size_binop (MINUS_EXPR, integer_zero_node, size_one_node);
3921 for (; elts; elts = TREE_CHAIN (elts))
3923 if (TREE_PURPOSE (elts))
3924 maxindex = TREE_PURPOSE (elts);
3926 maxindex = size_binop (PLUS_EXPR, maxindex, size_one_node);
3928 maxindex = copy_node (maxindex);
3932 /* Make an error message unless that happened already. */
3933 if (initial_value != error_mark_node)
3936 /* Prevent further error messages. */
3937 maxindex = build_int_2 (0, 0);
3944 maxindex = build_int_2 (0, 0);
3950 TYPE_DOMAIN (type) = build_index_type (maxindex);
3951 if (!TREE_TYPE (maxindex))
3952 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3955 /* Lay out the type now that we can get the real answer. */
3962 /* Given declspecs and a declarator,
3963 determine the name and type of the object declared
3964 and construct a ..._DECL node for it.
3965 (In one case we can return a ..._TYPE node instead.
3966 For invalid input we sometimes return 0.)
3968 DECLSPECS is a chain of tree_list nodes whose value fields
3969 are the storage classes and type specifiers.
3971 DECL_CONTEXT says which syntactic context this declaration is in:
3972 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3973 FUNCDEF for a function definition. Like NORMAL but a few different
3974 error messages in each case. Return value may be zero meaning
3975 this definition is too screwy to try to parse.
3976 PARM for a parameter declaration (either within a function prototype
3977 or before a function body). Make a PARM_DECL, or return void_type_node.
3978 TYPENAME if for a typename (in a cast or sizeof).
3979 Don't make a DECL node; just return the ..._TYPE node.
3980 FIELD for a struct or union field; make a FIELD_DECL.
3981 BITFIELD for a field with specified width.
3982 INITIALIZED is 1 if the decl has an initializer.
3984 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3985 It may also be so in the PARM case, for a prototype where the
3986 argument type is specified but not the name.
3988 This function is where the complicated C meanings of `static'
3989 and `extern' are interpreted. */
3992 grokdeclarator (declarator, declspecs, decl_context, initialized)
3995 enum decl_context decl_context;
4000 tree type = NULL_TREE;
4005 int type_quals = TYPE_UNQUALIFIED;
4007 int explicit_int = 0;
4008 int explicit_char = 0;
4009 int defaulted_int = 0;
4010 tree typedef_decl = 0;
4012 tree typedef_type = 0;
4013 int funcdef_flag = 0;
4014 enum tree_code innermost_code = ERROR_MARK;
4016 int size_varies = 0;
4017 tree decl_machine_attr = NULL_TREE;
4019 if (decl_context == BITFIELD)
4020 bitfield = 1, decl_context = FIELD;
4022 if (decl_context == FUNCDEF)
4023 funcdef_flag = 1, decl_context = NORMAL;
4025 push_obstacks_nochange ();
4027 if (flag_traditional && allocation_temporary_p ())
4028 end_temporary_allocation ();
4030 /* Look inside a declarator for the name being declared
4031 and get it as a string, for an error message. */
4033 register tree decl = declarator;
4037 switch (TREE_CODE (decl))
4042 innermost_code = TREE_CODE (decl);
4043 decl = TREE_OPERAND (decl, 0);
4046 case IDENTIFIER_NODE:
4047 name = IDENTIFIER_POINTER (decl);
4058 /* A function definition's declarator must have the form of
4059 a function declarator. */
4061 if (funcdef_flag && innermost_code != CALL_EXPR)
4064 /* Anything declared one level down from the top level
4065 must be one of the parameters of a function
4066 (because the body is at least two levels down). */
4068 /* If this looks like a function definition, make it one,
4069 even if it occurs where parms are expected.
4070 Then store_parm_decls will reject it and not use it as a parm. */
4071 if (decl_context == NORMAL && !funcdef_flag
4072 && current_binding_level->parm_flag)
4073 decl_context = PARM;
4075 /* Look through the decl specs and record which ones appear.
4076 Some typespecs are defined as built-in typenames.
4077 Others, the ones that are modifiers of other types,
4078 are represented by bits in SPECBITS: set the bits for
4079 the modifiers that appear. Storage class keywords are also in SPECBITS.
4081 If there is a typedef name or a type, store the type in TYPE.
4082 This includes builtin typedefs such as `int'.
4084 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
4085 and did not come from a user typedef.
4087 Set LONGLONG if `long' is mentioned twice. */
4089 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
4092 register tree id = TREE_VALUE (spec);
4094 if (id == ridpointers[(int) RID_INT])
4096 if (id == ridpointers[(int) RID_CHAR])
4099 if (TREE_CODE (id) == IDENTIFIER_NODE)
4100 for (i = (int) RID_FIRST_MODIFIER; i < (int) RID_MAX; i++)
4102 if (ridpointers[i] == id)
4104 if (i == (int) RID_LONG && specbits & (1<<i))
4107 error ("`long long long' is too long for GCC");
4110 if (pedantic && ! in_system_header && warn_long_long)
4111 pedwarn ("ANSI C does not support `long long'");
4115 else if (specbits & (1 << i))
4116 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
4122 error ("two or more data types in declaration of `%s'", name);
4123 /* Actual typedefs come to us as TYPE_DECL nodes. */
4124 else if (TREE_CODE (id) == TYPE_DECL)
4126 type = TREE_TYPE (id);
4127 decl_machine_attr = DECL_MACHINE_ATTRIBUTES (id);
4130 /* Built-in types come as identifiers. */
4131 else if (TREE_CODE (id) == IDENTIFIER_NODE)
4133 register tree t = lookup_name (id);
4134 if (TREE_TYPE (t) == error_mark_node)
4136 else if (!t || TREE_CODE (t) != TYPE_DECL)
4137 error ("`%s' fails to be a typedef or built in type",
4138 IDENTIFIER_POINTER (id));
4141 type = TREE_TYPE (t);
4145 else if (TREE_CODE (id) != ERROR_MARK)
4151 typedef_type = type;
4153 size_varies = C_TYPE_VARIABLE_SIZE (type);
4155 /* No type at all: default to `int', and set DEFAULTED_INT
4156 because it was not a user-defined typedef. */
4160 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4161 | (1 << (int) RID_SIGNED)
4162 | (1 << (int) RID_UNSIGNED))))
4163 /* Don't warn about typedef foo = bar. */
4164 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
4165 && ! (in_system_header && ! allocation_temporary_p ()))
4167 /* Issue a warning if this is an ISO C 9x program or if -Wreturn-type
4168 and this is a function, or if -Wimplicit; prefer the former
4169 warning since it is more explicit. */
4170 if ((warn_implicit_int || warn_return_type) && funcdef_flag)
4171 warn_about_return_type = 1;
4172 else if (warn_implicit_int || flag_isoc9x)
4173 warning ("type defaults to `int' in declaration of `%s'", name);
4177 type = integer_type_node;
4180 /* Now process the modifiers that were specified
4181 and check for invalid combinations. */
4183 /* Long double is a special combination. */
4185 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4186 && TYPE_MAIN_VARIANT (type) == double_type_node)
4188 specbits &= ~ (1 << (int) RID_LONG);
4189 type = long_double_type_node;
4192 /* Check all other uses of type modifiers. */
4194 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4195 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4199 if ((specbits & 1 << (int) RID_LONG)
4200 && (specbits & 1 << (int) RID_SHORT))
4201 error ("both long and short specified for `%s'", name);
4202 else if (((specbits & 1 << (int) RID_LONG)
4203 || (specbits & 1 << (int) RID_SHORT))
4205 error ("long or short specified with char for `%s'", name);
4206 else if (((specbits & 1 << (int) RID_LONG)
4207 || (specbits & 1 << (int) RID_SHORT))
4208 && TREE_CODE (type) == REAL_TYPE)
4210 static int already = 0;
4212 error ("long or short specified with floating type for `%s'", name);
4213 if (! already && ! pedantic)
4215 error ("the only valid combination is `long double'");
4219 else if ((specbits & 1 << (int) RID_SIGNED)
4220 && (specbits & 1 << (int) RID_UNSIGNED))
4221 error ("both signed and unsigned specified for `%s'", name);
4222 else if (TREE_CODE (type) != INTEGER_TYPE)
4223 error ("long, short, signed or unsigned invalid for `%s'", name);
4227 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4229 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4231 if (flag_pedantic_errors)
4236 /* Discard the type modifiers if they are invalid. */
4239 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4240 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4245 if ((specbits & (1 << (int) RID_COMPLEX))
4246 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4248 error ("complex invalid for `%s'", name);
4249 specbits &= ~ (1 << (int) RID_COMPLEX);
4252 /* Decide whether an integer type is signed or not.
4253 Optionally treat bitfields as signed by default. */
4254 if (specbits & 1 << (int) RID_UNSIGNED
4255 /* Traditionally, all bitfields are unsigned. */
4256 || (bitfield && flag_traditional
4257 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4258 || (bitfield && ! flag_signed_bitfields
4259 && (explicit_int || defaulted_int || explicit_char
4260 /* A typedef for plain `int' without `signed'
4261 can be controlled just like plain `int'. */
4262 || ! (typedef_decl != 0
4263 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4264 && TREE_CODE (type) != ENUMERAL_TYPE
4265 && !(specbits & 1 << (int) RID_SIGNED)))
4268 type = long_long_unsigned_type_node;
4269 else if (specbits & 1 << (int) RID_LONG)
4270 type = long_unsigned_type_node;
4271 else if (specbits & 1 << (int) RID_SHORT)
4272 type = short_unsigned_type_node;
4273 else if (type == char_type_node)
4274 type = unsigned_char_type_node;
4275 else if (typedef_decl)
4276 type = unsigned_type (type);
4278 type = unsigned_type_node;
4280 else if ((specbits & 1 << (int) RID_SIGNED)
4281 && type == char_type_node)
4282 type = signed_char_type_node;
4284 type = long_long_integer_type_node;
4285 else if (specbits & 1 << (int) RID_LONG)
4286 type = long_integer_type_node;
4287 else if (specbits & 1 << (int) RID_SHORT)
4288 type = short_integer_type_node;
4290 if (specbits & 1 << (int) RID_COMPLEX)
4292 /* If we just have "complex", it is equivalent to
4293 "complex double", but if any modifiers at all are specified it is
4294 the complex form of TYPE. E.g, "complex short" is
4295 "complex short int". */
4297 if (defaulted_int && ! longlong
4298 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4299 | (1 << (int) RID_SIGNED)
4300 | (1 << (int) RID_UNSIGNED))))
4301 type = complex_double_type_node;
4302 else if (type == integer_type_node)
4303 type = complex_integer_type_node;
4304 else if (type == float_type_node)
4305 type = complex_float_type_node;
4306 else if (type == double_type_node)
4307 type = complex_double_type_node;
4308 else if (type == long_double_type_node)
4309 type = complex_long_double_type_node;
4311 type = build_complex_type (type);
4314 /* Figure out the type qualifiers for the declaration. There are
4315 two ways a declaration can become qualified. One is something
4316 like `const int i' where the `const' is explicit. Another is
4317 something like `typedef const int CI; CI i' where the type of the
4318 declaration contains the `const'. */
4319 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4320 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
4321 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4322 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4324 pedwarn ("duplicate `const'");
4326 pedwarn ("duplicate `restrict'");
4328 pedwarn ("duplicate `volatile'");
4329 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
4330 type = TYPE_MAIN_VARIANT (type);
4331 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4332 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4333 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4335 /* Warn if two storage classes are given. Default to `auto'. */
4340 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4341 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4342 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4343 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4344 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4345 if (specbits & 1 << (int) RID_ITERATOR) nclasses++;
4347 /* Warn about storage classes that are invalid for certain
4348 kinds of declarations (parameters, typenames, etc.). */
4351 error ("multiple storage classes in declaration of `%s'", name);
4352 else if (funcdef_flag
4354 & ((1 << (int) RID_REGISTER)
4355 | (1 << (int) RID_AUTO)
4356 | (1 << (int) RID_TYPEDEF))))
4358 if (specbits & 1 << (int) RID_AUTO
4359 && (pedantic || current_binding_level == global_binding_level))
4360 pedwarn ("function definition declared `auto'");
4361 if (specbits & 1 << (int) RID_REGISTER)
4362 error ("function definition declared `register'");
4363 if (specbits & 1 << (int) RID_TYPEDEF)
4364 error ("function definition declared `typedef'");
4365 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4366 | (1 << (int) RID_AUTO));
4368 else if (decl_context != NORMAL && nclasses > 0)
4370 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4374 error ((decl_context == FIELD
4375 ? "storage class specified for structure field `%s'"
4376 : (decl_context == PARM
4377 ? "storage class specified for parameter `%s'"
4378 : "storage class specified for typename")),
4380 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4381 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4382 | (1 << (int) RID_EXTERN));
4385 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4387 /* `extern' with initialization is invalid if not at top level. */
4388 if (current_binding_level == global_binding_level)
4389 warning ("`%s' initialized and declared `extern'", name);
4391 error ("`%s' has both `extern' and initializer", name);
4393 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4394 && current_binding_level != global_binding_level)
4395 error ("nested function `%s' declared `extern'", name);
4396 else if (current_binding_level == global_binding_level
4397 && specbits & (1 << (int) RID_AUTO))
4398 error ("top-level declaration of `%s' specifies `auto'", name);
4399 else if ((specbits & 1 << (int) RID_ITERATOR)
4400 && TREE_CODE (declarator) != IDENTIFIER_NODE)
4402 error ("iterator `%s' has derived type", name);
4403 type = error_mark_node;
4405 else if ((specbits & 1 << (int) RID_ITERATOR)
4406 && TREE_CODE (type) != INTEGER_TYPE)
4408 error ("iterator `%s' has noninteger type", name);
4409 type = error_mark_node;
4413 /* Now figure out the structure of the declarator proper.
4414 Descend through it, creating more complex types, until we reach
4415 the declared identifier (or NULL_TREE, in an absolute declarator). */
4417 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4419 if (type == error_mark_node)
4421 declarator = TREE_OPERAND (declarator, 0);
4425 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4426 an INDIRECT_REF (for *...),
4427 a CALL_EXPR (for ...(...)),
4428 an identifier (for the name being declared)
4429 or a null pointer (for the place in an absolute declarator
4430 where the name was omitted).
4431 For the last two cases, we have just exited the loop.
4433 At this point, TYPE is the type of elements of an array,
4434 or for a function to return, or for a pointer to point to.
4435 After this sequence of ifs, TYPE is the type of the
4436 array or function or pointer, and DECLARATOR has had its
4437 outermost layer removed. */
4439 if (TREE_CODE (declarator) == ARRAY_REF)
4441 register tree itype = NULL_TREE;
4442 register tree size = TREE_OPERAND (declarator, 1);
4443 /* An uninitialized decl with `extern' is a reference. */
4444 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4445 /* The index is a signed object `sizetype' bits wide. */
4446 tree index_type = signed_type (sizetype);
4448 declarator = TREE_OPERAND (declarator, 0);
4450 /* Check for some types that there cannot be arrays of. */
4452 if (TYPE_MAIN_VARIANT (type) == void_type_node)
4454 error ("declaration of `%s' as array of voids", name);
4455 type = error_mark_node;
4458 if (TREE_CODE (type) == FUNCTION_TYPE)
4460 error ("declaration of `%s' as array of functions", name);
4461 type = error_mark_node;
4464 if (size == error_mark_node)
4465 type = error_mark_node;
4467 if (type == error_mark_node)
4470 /* If this is a block level extern, it must live past the end
4471 of the function so that we can check it against other extern
4472 declarations (IDENTIFIER_LIMBO_VALUE). */
4473 if (extern_ref && allocation_temporary_p ())
4474 end_temporary_allocation ();
4476 /* If size was specified, set ITYPE to a range-type for that size.
4477 Otherwise, ITYPE remains null. finish_decl may figure it out
4478 from an initial value. */
4482 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4483 STRIP_TYPE_NOPS (size);
4485 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
4486 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
4488 error ("size of array `%s' has non-integer type", name);
4489 size = integer_one_node;
4492 if (pedantic && integer_zerop (size))
4493 pedwarn ("ANSI C forbids zero-size array `%s'", name);
4495 if (TREE_CODE (size) == INTEGER_CST)
4497 constant_expression_warning (size);
4498 if (tree_int_cst_sgn (size) < 0)
4500 error ("size of array `%s' is negative", name);
4501 size = integer_one_node;
4506 /* Make sure the array size remains visibly nonconstant
4507 even if it is (eg) a const variable with known value. */
4512 if (TREE_CONSTANT (size))
4513 pedwarn ("ANSI C forbids array `%s' whose size can't be evaluated", name);
4515 pedwarn ("ANSI C forbids variable-size array `%s'", name);
4519 /* Convert size to index_type, so that if it is a variable
4520 the computations will be done in the proper mode. */
4521 itype = fold (build (MINUS_EXPR, index_type,
4522 convert (index_type, size),
4523 convert (index_type, size_one_node)));
4525 /* If that overflowed, the array is too big.
4526 ??? While a size of INT_MAX+1 technically shouldn't cause
4527 an overflow (because we subtract 1), the overflow is recorded
4528 during the conversion to index_type, before the subtraction.
4529 Handling this case seems like an unnecessary complication. */
4530 if (TREE_OVERFLOW (itype))
4532 error ("size of array `%s' is too large", name);
4533 type = error_mark_node;
4538 itype = variable_size (itype);
4539 itype = build_index_type (itype);
4542 #if 0 /* This had bad results for pointers to arrays, as in
4543 union incomplete (*foo)[4]; */
4544 /* Complain about arrays of incomplete types, except in typedefs. */
4546 if (TYPE_SIZE (type) == 0
4547 /* Avoid multiple warnings for nested array types. */
4548 && TREE_CODE (type) != ARRAY_TYPE
4549 && !(specbits & (1 << (int) RID_TYPEDEF))
4550 && !C_TYPE_BEING_DEFINED (type))
4551 warning ("array type has incomplete element type");
4554 #if 0 /* We shouldn't have a function type here at all!
4555 Functions aren't allowed as array elements. */
4556 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4557 && (constp || volatilep))
4558 pedwarn ("ANSI C forbids const or volatile function types");
4561 /* Build the array type itself, then merge any constancy or
4562 volatility into the target type. We must do it in this order
4563 to ensure that the TYPE_MAIN_VARIANT field of the array type
4564 is set correctly. */
4566 type = build_array_type (type, itype);
4568 type = c_build_qualified_type (type, type_quals);
4570 #if 0 /* don't clear these; leave them set so that the array type
4571 or the variable is itself const or volatile. */
4572 type_quals = TYPE_UNQUALIFIED;
4576 C_TYPE_VARIABLE_SIZE (type) = 1;
4578 else if (TREE_CODE (declarator) == CALL_EXPR)
4580 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4581 || current_binding_level == global_binding_level);
4584 /* Declaring a function type.
4585 Make sure we have a valid type for the function to return. */
4586 if (type == error_mark_node)
4591 /* Warn about some types functions can't return. */
4593 if (TREE_CODE (type) == FUNCTION_TYPE)
4595 error ("`%s' declared as function returning a function", name);
4596 type = integer_type_node;
4598 if (TREE_CODE (type) == ARRAY_TYPE)
4600 error ("`%s' declared as function returning an array", name);
4601 type = integer_type_node;
4604 #ifndef TRADITIONAL_RETURN_FLOAT
4605 /* Traditionally, declaring return type float means double. */
4607 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4608 type = double_type_node;
4609 #endif /* TRADITIONAL_RETURN_FLOAT */
4611 /* If this is a block level extern, it must live past the end
4612 of the function so that we can check it against other extern
4613 declarations (IDENTIFIER_LIMBO_VALUE). */
4614 if (extern_ref && allocation_temporary_p ())
4615 end_temporary_allocation ();
4617 /* Construct the function type and go to the next
4618 inner layer of declarator. */
4620 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4622 /* Say it's a definition
4623 only for the CALL_EXPR
4624 closest to the identifier. */
4625 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4626 #if 0 /* This seems to be false. We turn off temporary allocation
4627 above in this function if -traditional.
4628 And this code caused inconsistent results with prototypes:
4629 callers would ignore them, and pass arguments wrong. */
4631 /* Omit the arg types if -traditional, since the arg types
4632 and the list links might not be permanent. */
4633 type = build_function_type (type,
4635 ? NULL_TREE : arg_types);
4637 /* Type qualifiers before the return type of the function
4638 qualify the return type, not the function type. */
4640 type = c_build_qualified_type (type, type_quals);
4641 type_quals = TYPE_UNQUALIFIED;
4643 type = build_function_type (type, arg_types);
4644 declarator = TREE_OPERAND (declarator, 0);
4646 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4647 the formal parameter list of this FUNCTION_TYPE to point to
4648 the FUNCTION_TYPE node itself. */
4653 for (link = last_function_parm_tags;
4655 link = TREE_CHAIN (link))
4656 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4659 else if (TREE_CODE (declarator) == INDIRECT_REF)
4661 /* Merge any constancy or volatility into the target type
4664 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4666 pedwarn ("ANSI C forbids qualified function types");
4668 type = c_build_qualified_type (type, type_quals);
4669 type_quals = TYPE_UNQUALIFIED;
4672 type = build_pointer_type (type);
4674 /* Process a list of type modifier keywords
4675 (such as const or volatile) that were given inside the `*'. */
4677 if (TREE_TYPE (declarator))
4679 register tree typemodlist;
4685 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4686 typemodlist = TREE_CHAIN (typemodlist))
4688 tree qualifier = TREE_VALUE (typemodlist);
4690 if (qualifier == ridpointers[(int) RID_CONST])
4692 else if (qualifier == ridpointers[(int) RID_VOLATILE])
4694 else if (qualifier == ridpointers[(int) RID_RESTRICT])
4699 error ("invalid type modifier within pointer declarator");
4703 pedwarn ("duplicate `const'");
4705 pedwarn ("duplicate `volatile'");
4707 pedwarn ("duplicate `restrict'");
4709 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4710 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4711 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4714 declarator = TREE_OPERAND (declarator, 0);
4721 /* Now TYPE has the actual type. */
4723 /* Did array size calculations overflow? */
4725 if (TREE_CODE (type) == ARRAY_TYPE
4727 && TREE_OVERFLOW (TYPE_SIZE (type)))
4728 error ("size of array `%s' is too large", name);
4730 /* If this is declaring a typedef name, return a TYPE_DECL. */
4732 if (specbits & (1 << (int) RID_TYPEDEF))
4735 /* Note that the grammar rejects storage classes
4736 in typenames, fields or parameters */
4737 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4739 pedwarn ("ANSI C forbids qualified function types");
4741 type = c_build_qualified_type (type, type_quals);
4742 decl = build_decl (TYPE_DECL, declarator, type);
4743 if ((specbits & (1 << (int) RID_SIGNED))
4744 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4745 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4750 /* Detect the case of an array type of unspecified size
4751 which came, as such, direct from a typedef name.
4752 We must copy the type, so that each identifier gets
4753 a distinct type, so that each identifier's size can be
4754 controlled separately by its own initializer. */
4756 if (type != 0 && typedef_type != 0
4757 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type)
4758 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0)
4760 type = build_array_type (TREE_TYPE (type), 0);
4762 C_TYPE_VARIABLE_SIZE (type) = 1;
4765 /* If this is a type name (such as, in a cast or sizeof),
4766 compute the type and return it now. */
4768 if (decl_context == TYPENAME)
4770 /* Note that the grammar rejects storage classes
4771 in typenames, fields or parameters */
4772 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4774 pedwarn ("ANSI C forbids const or volatile function types");
4776 type = c_build_qualified_type (type, type_quals);
4781 /* Aside from typedefs and type names (handle above),
4782 `void' at top level (not within pointer)
4783 is allowed only in public variables.
4784 We don't complain about parms either, but that is because
4785 a better error message can be made later. */
4787 if (TYPE_MAIN_VARIANT (type) == void_type_node && decl_context != PARM
4788 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4789 && ((specbits & (1 << (int) RID_EXTERN))
4790 || (current_binding_level == global_binding_level
4792 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4794 error ("variable or field `%s' declared void", name);
4795 type = integer_type_node;
4798 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4799 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4804 if (decl_context == PARM)
4806 tree type_as_written = type;
4809 /* A parameter declared as an array of T is really a pointer to T.
4810 One declared as a function is really a pointer to a function. */
4812 if (TREE_CODE (type) == ARRAY_TYPE)
4814 /* Transfer const-ness of array into that of type pointed to. */
4815 type = TREE_TYPE (type);
4817 type = c_build_qualified_type (type, type_quals);
4818 type = build_pointer_type (type);
4819 type_quals = TYPE_UNQUALIFIED;
4822 else if (TREE_CODE (type) == FUNCTION_TYPE)
4824 if (pedantic && type_quals)
4825 pedwarn ("ANSI C forbids qualified function types");
4827 type = c_build_qualified_type (type, type_quals);
4828 type = build_pointer_type (type);
4829 type_quals = TYPE_UNQUALIFIED;
4832 decl = build_decl (PARM_DECL, declarator, type);
4834 C_DECL_VARIABLE_SIZE (decl) = 1;
4836 /* Compute the type actually passed in the parmlist,
4837 for the case where there is no prototype.
4838 (For example, shorts and chars are passed as ints.)
4839 When there is a prototype, this is overridden later. */
4841 DECL_ARG_TYPE (decl) = type;
4842 main_type = (type == error_mark_node
4844 : TYPE_MAIN_VARIANT (type));
4845 if (main_type == float_type_node)
4846 DECL_ARG_TYPE (decl) = double_type_node;
4847 /* Don't use TYPE_PRECISION to decide whether to promote,
4848 because we should convert short if it's the same size as int,
4849 but we should not convert long if it's the same size as int. */
4850 else if (TREE_CODE (main_type) != ERROR_MARK
4851 && C_PROMOTING_INTEGER_TYPE_P (main_type))
4853 if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)
4854 && TREE_UNSIGNED (type))
4855 DECL_ARG_TYPE (decl) = unsigned_type_node;
4857 DECL_ARG_TYPE (decl) = integer_type_node;
4860 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4862 else if (decl_context == FIELD)
4864 /* Structure field. It may not be a function. */
4866 if (TREE_CODE (type) == FUNCTION_TYPE)
4868 error ("field `%s' declared as a function", name);
4869 type = build_pointer_type (type);
4871 else if (TREE_CODE (type) != ERROR_MARK && TYPE_SIZE (type) == 0)
4873 error ("field `%s' has incomplete type", name);
4874 type = error_mark_node;
4876 /* Move type qualifiers down to element of an array. */
4877 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4879 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4881 TYPE_DOMAIN (type));
4882 #if 0 /* Leave the field const or volatile as well. */
4883 type_quals = TYPE_UNQUALIFIED;
4886 decl = build_decl (FIELD_DECL, declarator, type);
4888 C_DECL_VARIABLE_SIZE (decl) = 1;
4890 else if (TREE_CODE (type) == FUNCTION_TYPE)
4892 /* Every function declaration is "external"
4893 except for those which are inside a function body
4894 in which `auto' is used.
4895 That is a case not specified by ANSI C,
4896 and we use it for forward declarations for nested functions. */
4897 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4898 || current_binding_level == global_binding_level);
4900 if (specbits & (1 << (int) RID_AUTO)
4901 && (pedantic || current_binding_level == global_binding_level))
4902 pedwarn ("invalid storage class for function `%s'", name);
4903 if (specbits & (1 << (int) RID_REGISTER))
4904 error ("invalid storage class for function `%s'", name);
4905 /* Function declaration not at top level.
4906 Storage classes other than `extern' are not allowed
4907 and `extern' makes no difference. */
4908 if (current_binding_level != global_binding_level
4909 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4911 pedwarn ("invalid storage class for function `%s'", name);
4913 /* If this is a block level extern, it must live past the end
4914 of the function so that we can check it against other
4915 extern declarations (IDENTIFIER_LIMBO_VALUE). */
4916 if (extern_ref && allocation_temporary_p ())
4917 end_temporary_allocation ();
4919 decl = build_decl (FUNCTION_DECL, declarator, type);
4920 decl = build_decl_attribute_variant (decl, decl_machine_attr);
4922 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4923 pedwarn ("ANSI C forbids qualified function types");
4926 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl))) == void_type_node
4927 && TYPE_QUALS (TREE_TYPE (TREE_TYPE (decl)))
4928 && ! DECL_IN_SYSTEM_HEADER (decl))
4929 pedwarn ("ANSI C forbids qualified void function return type");
4931 /* GNU C interprets a `volatile void' return type to indicate
4932 that the function does not return. */
4933 if ((type_quals & TYPE_QUAL_VOLATILE)
4934 && TREE_TYPE (TREE_TYPE (decl)) != void_type_node)
4935 warning ("`noreturn' function returns non-void value");
4938 DECL_EXTERNAL (decl) = 1;
4939 /* Record absence of global scope for `static' or `auto'. */
4941 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4943 /* Record presence of `inline', if it is reasonable. */
4946 if (! strcmp (IDENTIFIER_POINTER (declarator), "main"))
4947 warning ("cannot inline function `main'");
4949 /* Assume that otherwise the function can be inlined. */
4950 DECL_INLINE (decl) = 1;
4952 if (specbits & (1 << (int) RID_EXTERN))
4953 current_extern_inline = 1;
4958 /* It's a variable. */
4959 /* An uninitialized decl with `extern' is a reference. */
4960 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4962 /* Move type qualifiers down to element of an array. */
4963 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4965 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4967 TYPE_DOMAIN (type));
4968 #if 0 /* Leave the variable const or volatile as well. */
4969 type_quals = TYPE_UNQUALIFIED;
4973 /* If this is a block level extern, it must live past the end
4974 of the function so that we can check it against other
4975 extern declarations (IDENTIFIER_LIMBO_VALUE). */
4976 if (extern_ref && allocation_temporary_p ())
4977 end_temporary_allocation ();
4979 decl = build_decl (VAR_DECL, declarator, type);
4981 C_DECL_VARIABLE_SIZE (decl) = 1;
4984 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4986 DECL_EXTERNAL (decl) = extern_ref;
4987 /* At top level, the presence of a `static' or `register' storage
4988 class specifier, or the absence of all storage class specifiers
4989 makes this declaration a definition (perhaps tentative). Also,
4990 the absence of both `static' and `register' makes it public. */
4991 if (current_binding_level == global_binding_level)
4995 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
4996 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
4998 /* Not at top level, only `static' makes a static definition. */
5001 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
5002 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
5005 if (specbits & 1 << (int) RID_ITERATOR)
5006 ITERATOR_P (decl) = 1;
5009 /* Record `register' declaration for warnings on &
5010 and in case doing stupid register allocation. */
5012 if (specbits & (1 << (int) RID_REGISTER))
5013 DECL_REGISTER (decl) = 1;
5015 /* Record constancy and volatility. */
5016 c_apply_type_quals_to_decl (type_quals, decl);
5018 /* If a type has volatile components, it should be stored in memory.
5019 Otherwise, the fact that those components are volatile
5020 will be ignored, and would even crash the compiler. */
5021 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
5022 mark_addressable (decl);
5030 /* Decode the parameter-list info for a function type or function definition.
5031 The argument is the value returned by `get_parm_info' (or made in parse.y
5032 if there is an identifier list instead of a parameter decl list).
5033 These two functions are separate because when a function returns
5034 or receives functions then each is called multiple times but the order
5035 of calls is different. The last call to `grokparms' is always the one
5036 that contains the formal parameter names of a function definition.
5038 Store in `last_function_parms' a chain of the decls of parms.
5039 Also store in `last_function_parm_tags' a chain of the struct, union,
5040 and enum tags declared among the parms.
5042 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5044 FUNCDEF_FLAG is nonzero for a function definition, 0 for
5045 a mere declaration. A nonempty identifier-list gets an error message
5046 when FUNCDEF_FLAG is zero. */
5049 grokparms (parms_info, funcdef_flag)
5053 tree first_parm = TREE_CHAIN (parms_info);
5055 last_function_parms = TREE_PURPOSE (parms_info);
5056 last_function_parm_tags = TREE_VALUE (parms_info);
5058 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
5059 && !in_system_header)
5060 warning ("function declaration isn't a prototype");
5063 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
5066 pedwarn ("parameter names (without types) in function declaration");
5068 last_function_parms = first_parm;
5075 /* We no longer test FUNCDEF_FLAG.
5076 If the arg types are incomplete in a declaration,
5077 they must include undefined tags.
5078 These tags can never be defined in the scope of the declaration,
5079 so the types can never be completed,
5080 and no call can be compiled successfully. */
5082 /* In a fcn definition, arg types must be complete. */
5085 for (parm = last_function_parms, typelt = first_parm;
5087 parm = TREE_CHAIN (parm))
5088 /* Skip over any enumeration constants declared here. */
5089 if (TREE_CODE (parm) == PARM_DECL)
5091 /* Barf if the parameter itself has an incomplete type. */
5092 tree type = TREE_VALUE (typelt);
5093 if (TYPE_SIZE (type) == 0)
5095 if (funcdef_flag && DECL_NAME (parm) != 0)
5096 error ("parameter `%s' has incomplete type",
5097 IDENTIFIER_POINTER (DECL_NAME (parm)));
5099 warning ("parameter has incomplete type");
5102 TREE_VALUE (typelt) = error_mark_node;
5103 TREE_TYPE (parm) = error_mark_node;
5106 #if 0 /* This has been replaced by parm_tags_warning
5107 which uses a more accurate criterion for what to warn about. */
5110 /* Now warn if is a pointer to an incomplete type. */
5111 while (TREE_CODE (type) == POINTER_TYPE
5112 || TREE_CODE (type) == REFERENCE_TYPE)
5113 type = TREE_TYPE (type);
5114 type = TYPE_MAIN_VARIANT (type);
5115 if (TYPE_SIZE (type) == 0)
5117 if (DECL_NAME (parm) != 0)
5118 warning ("parameter `%s' points to incomplete type",
5119 IDENTIFIER_POINTER (DECL_NAME (parm)));
5121 warning ("parameter points to incomplete type");
5125 typelt = TREE_CHAIN (typelt);
5128 /* Allocate the list of types the way we allocate a type. */
5129 if (first_parm && ! TREE_PERMANENT (first_parm))
5131 /* Construct a copy of the list of types
5132 on the saveable obstack. */
5134 for (typelt = first_parm; typelt; typelt = TREE_CHAIN (typelt))
5135 result = saveable_tree_cons (NULL_TREE, TREE_VALUE (typelt),
5137 return nreverse (result);
5140 /* The list we have is permanent already. */
5146 /* Return a tree_list node with info on a parameter list just parsed.
5147 The TREE_PURPOSE is a chain of decls of those parms.
5148 The TREE_VALUE is a list of structure, union and enum tags defined.
5149 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5150 This tree_list node is later fed to `grokparms'.
5152 VOID_AT_END nonzero means append `void' to the end of the type-list.
5153 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5156 get_parm_info (void_at_end)
5159 register tree decl, t;
5160 register tree types = 0;
5162 tree tags = gettags ();
5163 tree parms = getdecls ();
5165 tree order = current_binding_level->parm_order;
5167 /* Just `void' (and no ellipsis) is special. There are really no parms. */
5168 if (void_at_end && parms != 0
5169 && TREE_CHAIN (parms) == 0
5170 && TYPE_MAIN_VARIANT (TREE_TYPE (parms)) == void_type_node
5171 && DECL_NAME (parms) == 0)
5174 storedecls (NULL_TREE);
5175 return saveable_tree_cons (NULL_TREE, NULL_TREE,
5176 saveable_tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5179 /* Extract enumerator values and other non-parms declared with the parms.
5180 Likewise any forward parm decls that didn't have real parm decls. */
5181 for (decl = parms; decl; )
5183 tree next = TREE_CHAIN (decl);
5185 if (TREE_CODE (decl) != PARM_DECL)
5187 TREE_CHAIN (decl) = new_parms;
5190 else if (TREE_ASM_WRITTEN (decl))
5192 error_with_decl (decl, "parameter `%s' has just a forward declaration");
5193 TREE_CHAIN (decl) = new_parms;
5199 /* Put the parm decls back in the order they were in in the parm list. */
5200 for (t = order; t; t = TREE_CHAIN (t))
5203 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5205 TREE_CHAIN (TREE_VALUE (t)) = 0;
5208 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5211 /* Store the parmlist in the binding level since the old one
5212 is no longer a valid list. (We have changed the chain pointers.) */
5213 storedecls (new_parms);
5215 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5216 /* There may also be declarations for enumerators if an enumeration
5217 type is declared among the parms. Ignore them here. */
5218 if (TREE_CODE (decl) == PARM_DECL)
5220 /* Since there is a prototype,
5221 args are passed in their declared types. */
5222 tree type = TREE_TYPE (decl);
5223 DECL_ARG_TYPE (decl) = type;
5224 if (PROMOTE_PROTOTYPES
5225 && (TREE_CODE (type) == INTEGER_TYPE
5226 || TREE_CODE (type) == ENUMERAL_TYPE)
5227 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5228 DECL_ARG_TYPE (decl) = integer_type_node;
5230 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5231 if (TYPE_MAIN_VARIANT (TREE_VALUE (types)) == void_type_node && ! erred
5232 && DECL_NAME (decl) == 0)
5234 error ("`void' in parameter list must be the entire list");
5240 return saveable_tree_cons (new_parms, tags,
5241 nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types)));
5243 return saveable_tree_cons (new_parms, tags, nreverse (types));
5246 /* At end of parameter list, warn about any struct, union or enum tags
5247 defined within. Do so because these types cannot ever become complete. */
5250 parmlist_tags_warning ()
5255 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5257 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5258 /* An anonymous union parm type is meaningful as a GNU extension.
5259 So don't warn for that. */
5260 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5262 if (TREE_PURPOSE (elt) != 0)
5263 warning ("`%s %s' declared inside parameter list",
5264 (code == RECORD_TYPE ? "struct"
5265 : code == UNION_TYPE ? "union"
5267 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5269 warning ("anonymous %s declared inside parameter list",
5270 (code == RECORD_TYPE ? "struct"
5271 : code == UNION_TYPE ? "union"
5276 warning ("its scope is only this definition or declaration, which is probably not what you want.");
5282 /* Get the struct, enum or union (CODE says which) with tag NAME.
5283 Define the tag as a forward-reference if it is not defined. */
5286 xref_tag (code, name)
5287 enum tree_code code;
5290 int temporary = allocation_temporary_p ();
5292 /* If a cross reference is requested, look up the type
5293 already defined for this tag and return it. */
5295 register tree ref = lookup_tag (code, name, current_binding_level, 0);
5296 /* Even if this is the wrong type of tag, return what we found.
5297 There will be an error message anyway, from pending_xref_error.
5298 If we create an empty xref just for an invalid use of the type,
5299 the main result is to create lots of superfluous error messages. */
5303 push_obstacks_nochange ();
5305 if (current_binding_level == global_binding_level && temporary)
5306 end_temporary_allocation ();
5308 /* If no such tag is yet defined, create a forward-reference node
5309 and record it as the "definition".
5310 When a real declaration of this type is found,
5311 the forward-reference will be altered into a real type. */
5313 ref = make_node (code);
5314 if (code == ENUMERAL_TYPE)
5316 /* (In ANSI, Enums can be referred to only if already defined.) */
5318 pedwarn ("ANSI C forbids forward references to `enum' types");
5319 /* Give the type a default layout like unsigned int
5320 to avoid crashing if it does not get defined. */
5321 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5322 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5323 TREE_UNSIGNED (ref) = 1;
5324 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5325 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5326 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5329 pushtag (name, ref);
5336 /* Make sure that the tag NAME is defined *in the current binding level*
5337 at least as a forward reference.
5338 CODE says which kind of tag NAME ought to be.
5340 We also do a push_obstacks_nochange
5341 whose matching pop is in finish_struct. */
5344 start_struct (code, name)
5345 enum tree_code code;
5348 /* If there is already a tag defined at this binding level
5349 (as a forward reference), just return it. */
5351 register tree ref = 0;
5353 push_obstacks_nochange ();
5354 if (current_binding_level == global_binding_level)
5355 end_temporary_allocation ();
5358 ref = lookup_tag (code, name, current_binding_level, 1);
5359 if (ref && TREE_CODE (ref) == code)
5361 C_TYPE_BEING_DEFINED (ref) = 1;
5362 TYPE_PACKED (ref) = flag_pack_struct;
5363 if (TYPE_FIELDS (ref))
5364 error ((code == UNION_TYPE ? "redefinition of `union %s'"
5365 : "redefinition of `struct %s'"),
5366 IDENTIFIER_POINTER (name));
5371 /* Otherwise create a forward-reference just so the tag is in scope. */
5373 ref = make_node (code);
5374 pushtag (name, ref);
5375 C_TYPE_BEING_DEFINED (ref) = 1;
5376 TYPE_PACKED (ref) = flag_pack_struct;
5380 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5381 of a structure component, returning a FIELD_DECL node.
5382 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5384 This is done during the parsing of the struct declaration.
5385 The FIELD_DECL nodes are chained together and the lot of them
5386 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5389 grokfield (filename, line, declarator, declspecs, width)
5390 const char *filename ATTRIBUTE_UNUSED;
5391 int line ATTRIBUTE_UNUSED;
5392 tree declarator, declspecs, width;
5396 /* The corresponding pop_obstacks is in finish_decl. */
5397 push_obstacks_nochange ();
5399 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5401 finish_decl (value, NULL_TREE, NULL_TREE);
5402 DECL_INITIAL (value) = width;
5404 maybe_objc_check_decl (value);
5408 /* Function to help qsort sort FIELD_DECLs by name order. */
5411 field_decl_cmp (xp, yp)
5412 const GENERIC_PTR xp;
5413 const GENERIC_PTR yp;
5415 tree *x = (tree *)xp, *y = (tree *)yp;
5417 if (DECL_NAME (*x) == DECL_NAME (*y))
5419 if (DECL_NAME (*x) == NULL)
5421 if (DECL_NAME (*y) == NULL)
5423 if (DECL_NAME (*x) < DECL_NAME (*y))
5428 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5429 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5430 ATTRIBUTES are attributes to be applied to the structure.
5432 We also do a pop_obstacks to match the push in start_struct. */
5435 finish_struct (t, fieldlist, attributes)
5442 int toplevel = global_binding_level == current_binding_level;
5444 /* If this type was previously laid out as a forward reference,
5445 make sure we lay it out again. */
5449 decl_attributes (t, attributes, NULL_TREE);
5451 /* Nameless union parm types are useful as GCC extension. */
5452 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5453 /* Otherwise, warn about any struct or union def. in parmlist. */
5454 if (in_parm_level_p ())
5457 pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5458 : "structure defined inside parms"));
5459 else if (! flag_traditional)
5460 warning ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5461 : "structure defined inside parms"));
5464 old_momentary = suspend_momentary ();
5468 for (x = fieldlist; x; x = TREE_CHAIN (x))
5469 if (DECL_NAME (x) != 0)
5474 ? "%s has no named members"
5475 : "%s has no members"),
5476 TREE_CODE (t) == UNION_TYPE ? "union" : "struct");
5479 /* Install struct as DECL_CONTEXT of each field decl.
5480 Also process specified field sizes.
5481 Set DECL_FIELD_SIZE to the specified size, or 0 if none specified.
5482 The specified size is found in the DECL_INITIAL.
5483 Store 0 there, except for ": 0" fields (so we can find them
5484 and delete them, below). */
5486 for (x = fieldlist; x; x = TREE_CHAIN (x))
5488 DECL_CONTEXT (x) = t;
5489 DECL_PACKED (x) |= TYPE_PACKED (t);
5490 DECL_FIELD_SIZE (x) = 0;
5492 /* If any field is const, the structure type is pseudo-const. */
5493 if (TREE_READONLY (x))
5494 C_TYPE_FIELDS_READONLY (t) = 1;
5497 /* A field that is pseudo-const makes the structure likewise. */
5498 tree t1 = TREE_TYPE (x);
5499 while (TREE_CODE (t1) == ARRAY_TYPE)
5500 t1 = TREE_TYPE (t1);
5501 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5502 && C_TYPE_FIELDS_READONLY (t1))
5503 C_TYPE_FIELDS_READONLY (t) = 1;
5506 /* Any field that is volatile means variables of this type must be
5507 treated in some ways as volatile. */
5508 if (TREE_THIS_VOLATILE (x))
5509 C_TYPE_FIELDS_VOLATILE (t) = 1;
5511 /* Any field of nominal variable size implies structure is too. */
5512 if (C_DECL_VARIABLE_SIZE (x))
5513 C_TYPE_VARIABLE_SIZE (t) = 1;
5515 /* Detect invalid nested redefinition. */
5516 if (TREE_TYPE (x) == t)
5517 error ("nested redefinition of `%s'",
5518 IDENTIFIER_POINTER (TYPE_NAME (t)));
5520 /* Detect invalid bit-field size. */
5521 if (DECL_INITIAL (x))
5522 STRIP_NOPS (DECL_INITIAL (x));
5523 if (DECL_INITIAL (x))
5525 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5526 constant_expression_warning (DECL_INITIAL (x));
5529 error_with_decl (x, "bit-field `%s' width not an integer constant");
5530 DECL_INITIAL (x) = NULL;
5534 /* Detect invalid bit-field type. */
5535 if (DECL_INITIAL (x)
5536 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5537 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5539 error_with_decl (x, "bit-field `%s' has invalid type");
5540 DECL_INITIAL (x) = NULL;
5542 if (DECL_INITIAL (x) && pedantic
5543 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5544 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5545 /* Accept an enum that's equivalent to int or unsigned int. */
5546 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5547 && (TYPE_PRECISION (TREE_TYPE (x))
5548 == TYPE_PRECISION (integer_type_node))))
5549 pedwarn_with_decl (x, "bit-field `%s' type invalid in ANSI C");
5551 /* Detect and ignore out of range field width. */
5552 if (DECL_INITIAL (x))
5554 unsigned HOST_WIDE_INT width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5556 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5558 DECL_INITIAL (x) = NULL;
5559 error_with_decl (x, "negative width in bit-field `%s'");
5561 else if (TREE_INT_CST_HIGH (DECL_INITIAL (x)) != 0
5562 || width > TYPE_PRECISION (TREE_TYPE (x)))
5564 DECL_INITIAL (x) = NULL;
5565 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5567 else if (width == 0 && DECL_NAME (x) != 0)
5569 error_with_decl (x, "zero width for bit-field `%s'");
5570 DECL_INITIAL (x) = NULL;
5574 /* Process valid field width. */
5575 if (DECL_INITIAL (x))
5577 register int width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5579 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5580 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5581 TREE_UNSIGNED (TREE_TYPE (x)))
5582 || width < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5583 TREE_UNSIGNED (TREE_TYPE (x)))))
5584 warning_with_decl (x, "`%s' is narrower than values of its type");
5586 DECL_FIELD_SIZE (x) = width;
5587 DECL_BIT_FIELD (x) = DECL_C_BIT_FIELD (x) = 1;
5588 DECL_INITIAL (x) = NULL;
5592 /* field size 0 => force desired amount of alignment. */
5593 #ifdef EMPTY_FIELD_BOUNDARY
5594 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5596 #ifdef PCC_BITFIELD_TYPE_MATTERS
5597 if (PCC_BITFIELD_TYPE_MATTERS)
5598 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5599 TYPE_ALIGN (TREE_TYPE (x)));
5603 else if (TREE_TYPE (x) != error_mark_node)
5605 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5606 : TYPE_ALIGN (TREE_TYPE (x)));
5607 /* Non-bit-fields are aligned for their type, except packed
5608 fields which require only BITS_PER_UNIT alignment. */
5609 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5613 /* Now DECL_INITIAL is null on all members. */
5615 /* Delete all duplicate fields from the fieldlist */
5616 for (x = fieldlist; x && TREE_CHAIN (x);)
5617 /* Anonymous fields aren't duplicates. */
5618 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5622 register tree y = fieldlist;
5626 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5632 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5634 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5635 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5637 else x = TREE_CHAIN (x);
5640 /* Now we have the nearly final fieldlist. Record it,
5641 then lay out the structure or union (including the fields). */
5643 TYPE_FIELDS (t) = fieldlist;
5647 /* Delete all zero-width bit-fields from the front of the fieldlist */
5649 && DECL_INITIAL (fieldlist))
5650 fieldlist = TREE_CHAIN (fieldlist);
5651 /* Delete all such members from the rest of the fieldlist */
5652 for (x = fieldlist; x;)
5654 if (TREE_CHAIN (x) && DECL_INITIAL (TREE_CHAIN (x)))
5655 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5656 else x = TREE_CHAIN (x);
5659 /* Now we have the truly final field list.
5660 Store it in this type and in the variants. */
5662 TYPE_FIELDS (t) = fieldlist;
5664 /* If there are lots of fields, sort so we can look through them fast.
5665 We arbitrarily consider 16 or more elts to be "a lot". */
5669 for (x = fieldlist; x; x = TREE_CHAIN (x))
5680 len += list_length (x);
5681 /* Use the same allocation policy here that make_node uses, to
5682 ensure that this lives as long as the rest of the struct decl.
5683 All decls in an inline function need to be saved. */
5684 if (allocation_temporary_p ())
5685 space = savealloc (sizeof (struct lang_type) + len * sizeof (tree));
5687 space = oballoc (sizeof (struct lang_type) + len * sizeof (tree));
5689 TYPE_LANG_SPECIFIC (t) = (struct lang_type *) space;
5690 TYPE_LANG_SPECIFIC (t)->len = len;
5692 field_array = &TYPE_LANG_SPECIFIC (t)->elts[0];
5694 for (x = fieldlist; x; x = TREE_CHAIN (x))
5695 field_array[len++] = x;
5697 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5701 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5703 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5704 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5705 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5708 /* If this was supposed to be a transparent union, but we can't
5709 make it one, warn and turn off the flag. */
5710 if (TREE_CODE (t) == UNION_TYPE
5711 && TYPE_TRANSPARENT_UNION (t)
5712 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5714 TYPE_TRANSPARENT_UNION (t) = 0;
5715 warning ("union cannot be made transparent");
5718 /* If this structure or union completes the type of any previous
5719 variable declaration, lay it out and output its rtl. */
5721 if (current_binding_level->n_incomplete != 0)
5724 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5726 if (TREE_TYPE (decl) == t
5727 && TREE_CODE (decl) != TYPE_DECL)
5729 layout_decl (decl, 0);
5730 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5731 maybe_objc_check_decl (decl);
5732 rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0);
5735 --current_binding_level->n_incomplete;
5737 else if (TYPE_SIZE (TREE_TYPE (decl)) == 0
5738 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5740 tree element = TREE_TYPE (decl);
5741 while (TREE_CODE (element) == ARRAY_TYPE)
5742 element = TREE_TYPE (element);
5744 layout_array_type (TREE_TYPE (decl));
5749 resume_momentary (old_momentary);
5751 /* Finish debugging output for this type. */
5752 rest_of_type_compilation (t, toplevel);
5754 /* The matching push is in start_struct. */
5760 /* Lay out the type T, and its element type, and so on. */
5763 layout_array_type (t)
5766 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5767 layout_array_type (TREE_TYPE (t));
5771 /* Begin compiling the definition of an enumeration type.
5772 NAME is its name (or null if anonymous).
5773 Returns the type object, as yet incomplete.
5774 Also records info about it so that build_enumerator
5775 may be used to declare the individual values as they are read. */
5781 register tree enumtype = 0;
5783 /* If this is the real definition for a previous forward reference,
5784 fill in the contents in the same object that used to be the
5785 forward reference. */
5788 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5790 /* The corresponding pop_obstacks is in finish_enum. */
5791 push_obstacks_nochange ();
5792 /* If these symbols and types are global, make them permanent. */
5793 if (current_binding_level == global_binding_level)
5794 end_temporary_allocation ();
5796 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5798 enumtype = make_node (ENUMERAL_TYPE);
5799 pushtag (name, enumtype);
5802 C_TYPE_BEING_DEFINED (enumtype) = 1;
5804 if (TYPE_VALUES (enumtype) != 0)
5806 /* This enum is a named one that has been declared already. */
5807 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5809 /* Completely replace its old definition.
5810 The old enumerators remain defined, however. */
5811 TYPE_VALUES (enumtype) = 0;
5814 enum_next_value = integer_zero_node;
5817 if (flag_short_enums)
5818 TYPE_PACKED (enumtype) = 1;
5823 /* After processing and defining all the values of an enumeration type,
5824 install their decls in the enumeration type and finish it off.
5825 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5826 and ATTRIBUTES are the specified attributes.
5827 Returns ENUMTYPE. */
5830 finish_enum (enumtype, values, attributes)
5835 register tree pair, tem;
5836 tree minnode = 0, maxnode = 0;
5837 int lowprec, highprec, precision;
5838 int toplevel = global_binding_level == current_binding_level;
5840 if (in_parm_level_p ())
5841 warning ("enum defined inside parms");
5843 decl_attributes (enumtype, attributes, NULL_TREE);
5845 /* Calculate the maximum value of any enumerator in this type. */
5847 if (values == error_mark_node)
5848 minnode = maxnode = integer_zero_node;
5850 for (pair = values; pair; pair = TREE_CHAIN (pair))
5852 tree value = TREE_VALUE (pair);
5854 minnode = maxnode = TREE_VALUE (pair);
5857 if (tree_int_cst_lt (maxnode, value))
5859 if (tree_int_cst_lt (value, minnode))
5864 TYPE_MIN_VALUE (enumtype) = minnode;
5865 TYPE_MAX_VALUE (enumtype) = maxnode;
5867 /* An enum can have some negative values; then it is signed. */
5868 TREE_UNSIGNED (enumtype) = tree_int_cst_sgn (minnode) >= 0;
5870 /* Determine the precision this type needs. */
5872 lowprec = min_precision (minnode, TREE_UNSIGNED (enumtype));
5873 highprec = min_precision (maxnode, TREE_UNSIGNED (enumtype));
5874 precision = MAX (lowprec, highprec);
5876 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5878 tree narrowest = type_for_size (precision, 1);
5881 warning ("enumeration values exceed range of largest integer");
5882 narrowest = long_long_integer_type_node;
5885 TYPE_PRECISION (enumtype) = TYPE_PRECISION (narrowest);
5888 TYPE_PRECISION (enumtype) = TYPE_PRECISION (integer_type_node);
5890 TYPE_SIZE (enumtype) = 0;
5891 layout_type (enumtype);
5893 if (values != error_mark_node)
5895 /* Change the type of the enumerators to be the enum type.
5896 Formerly this was done only for enums that fit in an int,
5897 but the comment said it was done only for enums wider than int.
5898 It seems necessary to do this for wide enums,
5899 and best not to change what's done for ordinary narrower ones. */
5900 for (pair = values; pair; pair = TREE_CHAIN (pair))
5902 TREE_TYPE (TREE_PURPOSE (pair)) = enumtype;
5903 DECL_SIZE (TREE_PURPOSE (pair)) = TYPE_SIZE (enumtype);
5904 if (TREE_CODE (TREE_PURPOSE (pair)) != FUNCTION_DECL)
5905 DECL_ALIGN (TREE_PURPOSE (pair)) = TYPE_ALIGN (enumtype);
5908 /* Replace the decl nodes in VALUES with their names. */
5909 for (pair = values; pair; pair = TREE_CHAIN (pair))
5910 TREE_PURPOSE (pair) = DECL_NAME (TREE_PURPOSE (pair));
5912 TYPE_VALUES (enumtype) = values;
5915 /* Fix up all variant types of this enum type. */
5916 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5918 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5919 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5920 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5921 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5922 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5923 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5924 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5925 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5926 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5929 /* Finish debugging output for this type. */
5930 rest_of_type_compilation (enumtype, toplevel);
5932 /* This matches a push in start_enum. */
5938 /* Build and install a CONST_DECL for one value of the
5939 current enumeration type (one that was begun with start_enum).
5940 Return a tree-list containing the CONST_DECL and its value.
5941 Assignment of sequential values by default is handled here. */
5944 build_enumerator (name, value)
5947 register tree decl, type;
5949 /* Validate and default VALUE. */
5951 /* Remove no-op casts from the value. */
5953 STRIP_TYPE_NOPS (value);
5957 if (TREE_CODE (value) == INTEGER_CST)
5959 value = default_conversion (value);
5960 constant_expression_warning (value);
5964 error ("enumerator value for `%s' not integer constant",
5965 IDENTIFIER_POINTER (name));
5970 /* Default based on previous value. */
5971 /* It should no longer be possible to have NON_LVALUE_EXPR
5975 value = enum_next_value;
5977 error ("overflow in enumeration values");
5980 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5982 pedwarn ("ANSI C restricts enumerator values to range of `int'");
5983 value = integer_zero_node;
5986 /* Set basis for default for next value. */
5987 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5988 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5990 /* Now create a declaration for the enum value name. */
5992 type = TREE_TYPE (value);
5993 type = type_for_size (MAX (TYPE_PRECISION (type),
5994 TYPE_PRECISION (integer_type_node)),
5996 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
5997 && TREE_UNSIGNED (type)));
5999 decl = build_decl (CONST_DECL, name, type);
6000 DECL_INITIAL (decl) = value;
6001 TREE_TYPE (value) = type;
6004 return saveable_tree_cons (decl, value, NULL_TREE);
6007 /* Create the FUNCTION_DECL for a function definition.
6008 DECLSPECS, DECLARATOR, PREFIX_ATTRIBUTES and ATTRIBUTES are the parts of
6009 the declaration; they describe the function's name and the type it returns,
6010 but twisted together in a fashion that parallels the syntax of C.
6012 This function creates a binding context for the function body
6013 as well as setting up the FUNCTION_DECL in current_function_decl.
6015 Returns 1 on success. If the DECLARATOR is not suitable for a function
6016 (it defines a datum instead), we return 0, which tells
6017 yyparse to report a parse error.
6019 NESTED is nonzero for a function nested within another function. */
6022 start_function (declspecs, declarator, prefix_attributes, attributes, nested)
6023 tree declarator, declspecs, prefix_attributes, attributes;
6026 tree decl1, old_decl;
6028 int old_immediate_size_expand = immediate_size_expand;
6030 current_function_returns_value = 0; /* Assume, until we see it does. */
6031 current_function_returns_null = 0;
6032 warn_about_return_type = 0;
6033 current_extern_inline = 0;
6034 c_function_varargs = 0;
6036 shadowed_labels = 0;
6038 /* Don't expand any sizes in the return type of the function. */
6039 immediate_size_expand = 0;
6041 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
6043 /* If the declarator is not suitable for a function definition,
6044 cause a syntax error. */
6047 immediate_size_expand = old_immediate_size_expand;
6051 decl_attributes (decl1, prefix_attributes, attributes);
6053 announce_function (decl1);
6055 if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl1))) == 0)
6057 error ("return-type is an incomplete type");
6058 /* Make it return void instead. */
6060 = build_function_type (void_type_node,
6061 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
6064 if (warn_about_return_type)
6065 warning ("return-type defaults to `int'");
6067 /* Save the parm names or decls from this function's declarator
6068 where store_parm_decls will find them. */
6069 current_function_parms = last_function_parms;
6070 current_function_parm_tags = last_function_parm_tags;
6072 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6073 error_mark_node is replaced below (in poplevel) with the BLOCK. */
6074 DECL_INITIAL (decl1) = error_mark_node;
6076 /* If this definition isn't a prototype and we had a prototype declaration
6077 before, copy the arg type info from that prototype.
6078 But not if what we had before was a builtin function. */
6079 old_decl = lookup_name_current_level (DECL_NAME (decl1));
6080 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
6081 && !DECL_BUILT_IN (old_decl)
6082 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6083 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
6084 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
6086 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
6087 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
6088 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
6091 /* If there is no explicit declaration, look for any out-of-scope implicit
6094 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
6096 /* Optionally warn of old-fashioned def with no previous prototype. */
6097 if (warn_strict_prototypes
6098 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6099 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
6100 warning ("function declaration isn't a prototype");
6101 /* Optionally warn of any global def with no previous prototype. */
6102 else if (warn_missing_prototypes
6103 && TREE_PUBLIC (decl1)
6104 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0)
6105 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
6106 warning_with_decl (decl1, "no previous prototype for `%s'");
6107 /* Optionally warn of any def with no previous prototype
6108 if the function has already been used. */
6109 else if (warn_missing_prototypes
6110 && old_decl != 0 && TREE_USED (old_decl)
6111 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6112 warning_with_decl (decl1,
6113 "`%s' was used with no prototype before its definition");
6114 /* Optionally warn of any global def with no previous declaration. */
6115 else if (warn_missing_declarations
6116 && TREE_PUBLIC (decl1)
6118 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
6119 warning_with_decl (decl1, "no previous declaration for `%s'");
6120 /* Optionally warn of any def with no previous declaration
6121 if the function has already been used. */
6122 else if (warn_missing_declarations
6123 && old_decl != 0 && TREE_USED (old_decl)
6124 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
6125 warning_with_decl (decl1,
6126 "`%s' was used with no declaration before its definition");
6128 /* This is a definition, not a reference.
6129 So normally clear DECL_EXTERNAL.
6130 However, `extern inline' acts like a declaration
6131 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6132 DECL_EXTERNAL (decl1) = current_extern_inline;
6134 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
6135 SET_DEFAULT_DECL_ATTRIBUTES (decl1, attributes);
6138 /* This function exists in static storage.
6139 (This does not mean `static' in the C sense!) */
6140 TREE_STATIC (decl1) = 1;
6142 /* A nested function is not global. */
6143 if (current_function_decl != 0)
6144 TREE_PUBLIC (decl1) = 0;
6146 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6148 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))) == 0)
6153 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6154 != integer_type_node)
6155 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
6157 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
6158 args = TREE_CHAIN (args))
6160 tree type = args ? TREE_VALUE (args) : 0;
6162 if (type == void_type_node)
6169 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6170 pedwarn_with_decl (decl1,
6171 "first argument of `%s' should be `int'");
6175 if (TREE_CODE (type) != POINTER_TYPE
6176 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6177 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6179 pedwarn_with_decl (decl1,
6180 "second argument of `%s' should be `char **'");
6184 if (TREE_CODE (type) != POINTER_TYPE
6185 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6186 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6188 pedwarn_with_decl (decl1,
6189 "third argument of `%s' should probably be `char **'");
6194 /* It is intentional that this message does not mention the third
6195 argument, which is warned for only pedantically, because it's
6196 blessed by mention in an appendix of the standard. */
6197 if (argct > 0 && (argct < 2 || argct > 3))
6198 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
6200 if (argct == 3 && pedantic)
6201 pedwarn_with_decl (decl1, "third argument of `%s' is deprecated");
6203 if (! TREE_PUBLIC (decl1))
6204 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
6207 /* Record the decl so that the function name is defined.
6208 If we already have a decl for this name, and it is a FUNCTION_DECL,
6209 use the old decl. */
6211 current_function_decl = pushdecl (decl1);
6214 declare_parm_level (1);
6215 current_binding_level->subblocks_tag_transparent = 1;
6217 make_function_rtl (current_function_decl);
6219 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6220 /* Promote the value to int before returning it. */
6221 if (C_PROMOTING_INTEGER_TYPE_P (restype))
6223 /* It retains unsignedness if traditional
6224 or if not really getting wider. */
6225 if (TREE_UNSIGNED (restype)
6226 && (flag_traditional
6227 || (TYPE_PRECISION (restype)
6228 == TYPE_PRECISION (integer_type_node))))
6229 restype = unsigned_type_node;
6231 restype = integer_type_node;
6233 DECL_RESULT (current_function_decl)
6234 = build_decl (RESULT_DECL, NULL_TREE, restype);
6237 /* Allocate further tree nodes temporarily during compilation
6238 of this function only. */
6239 temporary_allocation ();
6241 /* If this fcn was already referenced via a block-scope `extern' decl
6242 (or an implicit decl), propagate certain information about the usage. */
6243 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6244 TREE_ADDRESSABLE (current_function_decl) = 1;
6246 immediate_size_expand = old_immediate_size_expand;
6251 /* Record that this function is going to be a varargs function.
6252 This is called before store_parm_decls, which is too early
6253 to call mark_varargs directly. */
6258 c_function_varargs = 1;
6261 /* Store the parameter declarations into the current function declaration.
6262 This is called after parsing the parameter declarations, before
6263 digesting the body of the function.
6265 For an old-style definition, modify the function's type
6266 to specify at least the number of arguments. */
6271 register tree fndecl = current_function_decl;
6274 /* This is either a chain of PARM_DECLs (if a prototype was used)
6275 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6276 tree specparms = current_function_parms;
6278 /* This is a list of types declared among parms in a prototype. */
6279 tree parmtags = current_function_parm_tags;
6281 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6282 register tree parmdecls = getdecls ();
6284 /* This is a chain of any other decls that came in among the parm
6285 declarations. If a parm is declared with enum {foo, bar} x;
6286 then CONST_DECLs for foo and bar are put here. */
6289 /* Nonzero if this definition is written with a prototype. */
6292 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6294 /* This case is when the function was defined with an ANSI prototype.
6295 The parms already have decls, so we need not do anything here
6296 except record them as in effect
6297 and complain if any redundant old-style parm decls were written. */
6308 error_with_decl (fndecl,
6309 "parm types given both in parmlist and separately");
6310 /* Get rid of the erroneous decls; don't keep them on
6311 the list of parms, since they might not be PARM_DECLs. */
6312 for (decl = current_binding_level->names;
6313 decl; decl = TREE_CHAIN (decl))
6314 if (DECL_NAME (decl))
6315 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6316 for (link = current_binding_level->shadowed;
6317 link; link = TREE_CHAIN (link))
6318 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6319 current_binding_level->names = 0;
6320 current_binding_level->shadowed = 0;
6323 specparms = nreverse (specparms);
6324 for (parm = specparms; parm; parm = next)
6326 next = TREE_CHAIN (parm);
6327 if (TREE_CODE (parm) == PARM_DECL)
6329 if (DECL_NAME (parm) == 0)
6330 error_with_decl (parm, "parameter name omitted");
6331 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6333 error_with_decl (parm, "parameter `%s' declared void");
6334 /* Change the type to error_mark_node so this parameter
6335 will be ignored by assign_parms. */
6336 TREE_TYPE (parm) = error_mark_node;
6342 /* If we find an enum constant or a type tag,
6343 put it aside for the moment. */
6344 TREE_CHAIN (parm) = 0;
6345 others = chainon (others, parm);
6349 /* Get the decls in their original chain order
6350 and record in the function. */
6351 DECL_ARGUMENTS (fndecl) = getdecls ();
6354 /* If this function takes a variable number of arguments,
6355 add a phony parameter to the end of the parm list,
6356 to represent the position of the first unnamed argument. */
6357 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6360 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6361 /* Let's hope the address of the unnamed parm
6362 won't depend on its type. */
6363 TREE_TYPE (dummy) = integer_type_node;
6364 DECL_ARG_TYPE (dummy) = integer_type_node;
6365 DECL_ARGUMENTS (fndecl)
6366 = chainon (DECL_ARGUMENTS (fndecl), dummy);
6370 /* Now pushdecl the enum constants. */
6371 for (parm = others; parm; parm = next)
6373 next = TREE_CHAIN (parm);
6374 if (DECL_NAME (parm) == 0)
6376 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6378 else if (TREE_CODE (parm) != PARM_DECL)
6382 storetags (chainon (parmtags, gettags ()));
6386 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6387 each with a parm name as the TREE_VALUE.
6389 PARMDECLS is a chain of declarations for parameters.
6390 Warning! It can also contain CONST_DECLs which are not parameters
6391 but are names of enumerators of any enum types
6392 declared among the parameters.
6394 First match each formal parameter name with its declaration.
6395 Associate decls with the names and store the decls
6396 into the TREE_PURPOSE slots. */
6398 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6399 DECL_RESULT (parm) = 0;
6401 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6403 register tree tail, found = NULL;
6405 if (TREE_VALUE (parm) == 0)
6407 error_with_decl (fndecl, "parameter name missing from parameter list");
6408 TREE_PURPOSE (parm) = 0;
6412 /* See if any of the parmdecls specifies this parm by name.
6413 Ignore any enumerator decls. */
6414 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6415 if (DECL_NAME (tail) == TREE_VALUE (parm)
6416 && TREE_CODE (tail) == PARM_DECL)
6422 /* If declaration already marked, we have a duplicate name.
6423 Complain, and don't use this decl twice. */
6424 if (found && DECL_RESULT (found) != 0)
6426 error_with_decl (found, "multiple parameters named `%s'");
6430 /* If the declaration says "void", complain and ignore it. */
6431 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6433 error_with_decl (found, "parameter `%s' declared void");
6434 TREE_TYPE (found) = integer_type_node;
6435 DECL_ARG_TYPE (found) = integer_type_node;
6436 layout_decl (found, 0);
6439 /* Traditionally, a parm declared float is actually a double. */
6440 if (found && flag_traditional
6441 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6443 TREE_TYPE (found) = double_type_node;
6444 DECL_ARG_TYPE (found) = double_type_node;
6445 layout_decl (found, 0);
6448 /* If no declaration found, default to int. */
6451 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6453 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6454 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6455 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6457 warning_with_decl (found, "type of `%s' defaults to `int'");
6461 TREE_PURPOSE (parm) = found;
6463 /* Mark this decl as "already found" -- see test, above.
6464 It is safe to use DECL_RESULT for this
6465 since it is not used in PARM_DECLs or CONST_DECLs. */
6466 DECL_RESULT (found) = error_mark_node;
6469 /* Put anything which is on the parmdecls chain and which is
6470 not a PARM_DECL onto the list NONPARMS. (The types of
6471 non-parm things which might appear on the list include
6472 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6473 any actual PARM_DECLs not matched with any names. */
6476 for (parm = parmdecls; parm; )
6478 tree next = TREE_CHAIN (parm);
6479 TREE_CHAIN (parm) = 0;
6481 if (TREE_CODE (parm) != PARM_DECL)
6482 nonparms = chainon (nonparms, parm);
6485 /* Complain about args with incomplete types. */
6486 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6488 error_with_decl (parm, "parameter `%s' has incomplete type");
6489 TREE_TYPE (parm) = error_mark_node;
6492 if (DECL_RESULT (parm) == 0)
6494 error_with_decl (parm,
6495 "declaration for parameter `%s' but no such parameter");
6496 /* Pretend the parameter was not missing.
6497 This gets us to a standard state and minimizes
6498 further error messages. */
6500 = chainon (specparms,
6501 tree_cons (parm, NULL_TREE, NULL_TREE));
6508 /* Chain the declarations together in the order of the list of names. */
6509 /* Store that chain in the function decl, replacing the list of names. */
6511 DECL_ARGUMENTS (fndecl) = 0;
6514 for (last = 0; parm; parm = TREE_CHAIN (parm))
6515 if (TREE_PURPOSE (parm))
6518 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6520 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6521 last = TREE_PURPOSE (parm);
6522 TREE_CHAIN (last) = 0;
6526 /* If there was a previous prototype,
6527 set the DECL_ARG_TYPE of each argument according to
6528 the type previously specified, and report any mismatches. */
6530 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6533 for (parm = DECL_ARGUMENTS (fndecl),
6534 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6535 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6536 != void_type_node));
6537 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6539 if (parm == 0 || type == 0
6540 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6542 error ("number of arguments doesn't match prototype");
6543 error_with_file_and_line (current_function_prototype_file,
6544 current_function_prototype_line,
6545 "prototype declaration");
6548 /* Type for passing arg must be consistent
6549 with that declared for the arg. */
6550 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
6552 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6553 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6555 /* Adjust argument to match prototype. E.g. a previous
6556 `int foo(float);' prototype causes
6557 `int foo(x) float x; {...}' to be treated like
6558 `int foo(float x) {...}'. This is particularly
6559 useful for argument types like uid_t. */
6560 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6562 if (PROMOTE_PROTOTYPES
6563 && (TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
6564 || TREE_CODE (TREE_TYPE (parm)) == ENUMERAL_TYPE)
6565 && TYPE_PRECISION (TREE_TYPE (parm))
6566 < TYPE_PRECISION (integer_type_node))
6567 DECL_ARG_TYPE (parm) = integer_type_node;
6571 pedwarn ("promoted argument `%s' doesn't match prototype",
6572 IDENTIFIER_POINTER (DECL_NAME (parm)));
6573 warning_with_file_and_line
6574 (current_function_prototype_file,
6575 current_function_prototype_line,
6576 "prototype declaration");
6579 /* If -traditional, allow `int' argument to match
6580 `unsigned' prototype. */
6581 else if (! (flag_traditional
6582 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6583 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6585 error ("argument `%s' doesn't match prototype",
6586 IDENTIFIER_POINTER (DECL_NAME (parm)));
6587 error_with_file_and_line (current_function_prototype_file,
6588 current_function_prototype_line,
6589 "prototype declaration");
6593 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6596 /* Otherwise, create a prototype that would match. */
6600 tree actual = 0, last = 0, type;
6602 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6604 type = perm_tree_cons (NULL_TREE, DECL_ARG_TYPE (parm),
6607 TREE_CHAIN (last) = type;
6612 type = perm_tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6614 TREE_CHAIN (last) = type;
6618 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6619 of the type of this function, but we need to avoid having this
6620 affect the types of other similarly-typed functions, so we must
6621 first force the generation of an identical (but separate) type
6622 node for the relevant function type. The new node we create
6623 will be a variant of the main variant of the original function
6626 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6628 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6631 /* Now store the final chain of decls for the arguments
6632 as the decl-chain of the current lexical scope.
6633 Put the enumerators in as well, at the front so that
6634 DECL_ARGUMENTS is not modified. */
6636 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6639 /* Make sure the binding level for the top of the function body
6640 gets a BLOCK if there are any in the function.
6641 Otherwise, the dbx output is wrong. */
6643 keep_next_if_subblocks = 1;
6645 /* ??? This might be an improvement,
6646 but needs to be thought about some more. */
6648 keep_next_level_flag = 1;
6651 /* Write a record describing this function definition to the prototypes
6652 file (if requested). */
6654 gen_aux_info_record (fndecl, 1, 0, prototype);
6656 /* Initialize the RTL code for the function. */
6658 init_function_start (fndecl, input_filename, lineno);
6660 /* If this is a varargs function, inform function.c. */
6662 if (c_function_varargs)
6665 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
6667 declare_function_name ();
6669 /* Set up parameters and prepare for return, for the function. */
6671 expand_function_start (fndecl, 0);
6673 /* If this function is `main', emit a call to `__main'
6674 to run global initializers, etc. */
6675 if (DECL_NAME (fndecl)
6676 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main") == 0
6677 && DECL_CONTEXT (fndecl) == NULL_TREE)
6678 expand_main_function ();
6681 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6682 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6683 stands for an ellipsis in the identifier list.
6685 PARMLIST is the data returned by get_parm_info for the
6686 parmlist that follows the semicolon.
6688 We return a value of the same sort that get_parm_info returns,
6689 except that it describes the combination of identifiers and parmlist. */
6692 combine_parm_decls (specparms, parmlist, void_at_end)
6693 tree specparms, parmlist;
6696 register tree fndecl = current_function_decl;
6699 tree parmdecls = TREE_PURPOSE (parmlist);
6701 /* This is a chain of any other decls that came in among the parm
6702 declarations. They were separated already by get_parm_info,
6703 so we just need to keep them separate. */
6704 tree nonparms = TREE_VALUE (parmlist);
6708 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6709 DECL_RESULT (parm) = 0;
6711 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6713 register tree tail, found = NULL;
6715 /* See if any of the parmdecls specifies this parm by name. */
6716 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6717 if (DECL_NAME (tail) == TREE_VALUE (parm))
6723 /* If declaration already marked, we have a duplicate name.
6724 Complain, and don't use this decl twice. */
6725 if (found && DECL_RESULT (found) != 0)
6727 error_with_decl (found, "multiple parameters named `%s'");
6731 /* If the declaration says "void", complain and ignore it. */
6732 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6734 error_with_decl (found, "parameter `%s' declared void");
6735 TREE_TYPE (found) = integer_type_node;
6736 DECL_ARG_TYPE (found) = integer_type_node;
6737 layout_decl (found, 0);
6740 /* Traditionally, a parm declared float is actually a double. */
6741 if (found && flag_traditional
6742 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6744 TREE_TYPE (found) = double_type_node;
6745 DECL_ARG_TYPE (found) = double_type_node;
6746 layout_decl (found, 0);
6749 /* If no declaration found, default to int. */
6752 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6754 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6755 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6756 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6757 error_with_decl (found, "type of parameter `%s' is not declared");
6761 TREE_PURPOSE (parm) = found;
6763 /* Mark this decl as "already found" -- see test, above.
6764 It is safe to use DECL_RESULT for this
6765 since it is not used in PARM_DECLs or CONST_DECLs. */
6766 DECL_RESULT (found) = error_mark_node;
6769 /* Complain about any actual PARM_DECLs not matched with any names. */
6771 for (parm = parmdecls; parm; )
6773 tree next = TREE_CHAIN (parm);
6774 TREE_CHAIN (parm) = 0;
6776 /* Complain about args with incomplete types. */
6777 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6779 error_with_decl (parm, "parameter `%s' has incomplete type");
6780 TREE_TYPE (parm) = error_mark_node;
6783 if (DECL_RESULT (parm) == 0)
6785 error_with_decl (parm,
6786 "declaration for parameter `%s' but no such parameter");
6787 /* Pretend the parameter was not missing.
6788 This gets us to a standard state and minimizes
6789 further error messages. */
6791 = chainon (specparms,
6792 tree_cons (parm, NULL_TREE, NULL_TREE));
6798 /* Chain the declarations together in the order of the list of names.
6799 At the same time, build up a list of their types, in reverse order. */
6805 for (last = 0; parm; parm = TREE_CHAIN (parm))
6806 if (TREE_PURPOSE (parm))
6809 parmdecls = TREE_PURPOSE (parm);
6811 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6812 last = TREE_PURPOSE (parm);
6813 TREE_CHAIN (last) = 0;
6815 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (parm), types);
6820 return saveable_tree_cons (parmdecls, nonparms,
6821 nreverse (saveable_tree_cons (NULL_TREE,
6825 return saveable_tree_cons (parmdecls, nonparms, nreverse (types));
6828 /* Finish up a function declaration and compile that function
6829 all the way to assembler language output. The free the storage
6830 for the function definition.
6832 This is called after parsing the body of the function definition.
6834 NESTED is nonzero if the function being finished is nested in another. */
6837 finish_function (nested)
6840 register tree fndecl = current_function_decl;
6842 /* TREE_READONLY (fndecl) = 1;
6843 This caused &foo to be of type ptr-to-const-function
6844 which then got a warning when stored in a ptr-to-function variable. */
6847 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6849 /* Must mark the RESULT_DECL as being in this function. */
6851 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6853 /* Obey `register' declarations if `setjmp' is called in this fn. */
6854 if (flag_traditional && current_function_calls_setjmp)
6856 setjmp_protect (DECL_INITIAL (fndecl));
6857 setjmp_protect_args ();
6860 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main"))
6862 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6863 != integer_type_node)
6865 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6866 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6868 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
6872 #ifdef DEFAULT_MAIN_RETURN
6873 /* Make it so that `main' always returns success by default. */
6874 DEFAULT_MAIN_RETURN;
6879 /* Generate rtl for function exit. */
6880 expand_function_end (input_filename, lineno, 0);
6882 /* So we can tell if jump_optimize sets it to 1. */
6885 /* Run the optimizers and output the assembler code for this function. */
6886 rest_of_compilation (fndecl);
6888 current_function_returns_null |= can_reach_end;
6890 if (warn_missing_noreturn
6891 && !TREE_THIS_VOLATILE (fndecl)
6892 && !current_function_returns_null
6893 && !current_function_returns_value)
6894 warning ("function might be possible candidate for attribute `noreturn'");
6896 if (TREE_THIS_VOLATILE (fndecl) && current_function_returns_null)
6897 warning ("`noreturn' function does return");
6898 else if (warn_return_type && can_reach_end
6899 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) != void_type_node)
6900 /* If this function returns non-void and control can drop through,
6902 warning ("control reaches end of non-void function");
6903 /* With just -W, complain only if function returns both with
6904 and without a value. */
6905 else if (extra_warnings
6906 && current_function_returns_value && current_function_returns_null)
6907 warning ("this function may return with or without a value");
6909 /* If requested, warn about function definitions where the function will
6910 return a value (usually of some struct or union type) which itself will
6911 take up a lot of stack space. */
6913 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6915 register tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6919 register tree ret_type_size = TYPE_SIZE (ret_type);
6921 if (TREE_CODE (ret_type_size) == INTEGER_CST)
6924 = TREE_INT_CST_LOW (ret_type_size) / BITS_PER_UNIT;
6926 if (units > larger_than_size)
6927 warning_with_decl (fndecl,
6928 "size of return value of `%s' is %u bytes",
6934 /* Free all the tree nodes making up this function. */
6935 /* Switch back to allocating nodes permanently
6936 until we start another function. */
6938 permanent_allocation (1);
6940 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested)
6942 /* Stop pointing to the local nodes about to be freed. */
6943 /* But DECL_INITIAL must remain nonzero so we know this
6944 was an actual function definition. */
6945 /* For a nested function, this is done in pop_c_function_context. */
6946 /* If rest_of_compilation set this to 0, leave it 0. */
6947 if (DECL_INITIAL (fndecl) != 0)
6948 DECL_INITIAL (fndecl) = error_mark_node;
6949 DECL_ARGUMENTS (fndecl) = 0;
6952 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6954 #ifndef ASM_OUTPUT_CONSTRUCTOR
6955 if (! flag_gnu_linker)
6956 static_ctors = perm_tree_cons (NULL_TREE, fndecl, static_ctors);
6959 assemble_constructor (IDENTIFIER_POINTER (DECL_NAME (fndecl)));
6961 if (DECL_STATIC_DESTRUCTOR (fndecl))
6963 #ifndef ASM_OUTPUT_DESTRUCTOR
6964 if (! flag_gnu_linker)
6965 static_dtors = perm_tree_cons (NULL_TREE, fndecl, static_dtors);
6968 assemble_destructor (IDENTIFIER_POINTER (DECL_NAME (fndecl)));
6973 /* Let the error reporting routines know that we're outside a
6974 function. For a nested function, this value is used in
6975 pop_c_function_context and then reset via pop_function_context. */
6976 current_function_decl = NULL;
6980 /* Save and restore the variables in this file and elsewhere
6981 that keep track of the progress of compilation of the current function.
6982 Used for nested functions. */
6986 struct c_function *next;
6988 tree shadowed_labels;
6991 int warn_about_return_type;
6993 struct binding_level *binding_level;
6996 struct c_function *c_function_chain;
6998 /* Save and reinitialize the variables
6999 used during compilation of a C function. */
7002 push_c_function_context ()
7004 struct c_function *p
7005 = (struct c_function *) xmalloc (sizeof (struct c_function));
7008 pedwarn ("ANSI C forbids nested functions");
7010 push_function_context ();
7012 p->next = c_function_chain;
7013 c_function_chain = p;
7015 p->named_labels = named_labels;
7016 p->shadowed_labels = shadowed_labels;
7017 p->returns_value = current_function_returns_value;
7018 p->returns_null = current_function_returns_null;
7019 p->warn_about_return_type = warn_about_return_type;
7020 p->extern_inline = current_extern_inline;
7021 p->binding_level = current_binding_level;
7024 /* Restore the variables used during compilation of a C function. */
7027 pop_c_function_context ()
7029 struct c_function *p = c_function_chain;
7032 /* Bring back all the labels that were shadowed. */
7033 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
7034 if (DECL_NAME (TREE_VALUE (link)) != 0)
7035 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
7036 = TREE_VALUE (link);
7038 if (DECL_SAVED_INSNS (current_function_decl) == 0)
7040 /* Stop pointing to the local nodes about to be freed. */
7041 /* But DECL_INITIAL must remain nonzero so we know this
7042 was an actual function definition. */
7043 DECL_INITIAL (current_function_decl) = error_mark_node;
7044 DECL_ARGUMENTS (current_function_decl) = 0;
7047 pop_function_context ();
7049 c_function_chain = p->next;
7051 named_labels = p->named_labels;
7052 shadowed_labels = p->shadowed_labels;
7053 current_function_returns_value = p->returns_value;
7054 current_function_returns_null = p->returns_null;
7055 warn_about_return_type = p->warn_about_return_type;
7056 current_extern_inline = p->extern_inline;
7057 current_binding_level = p->binding_level;
7062 /* integrate_decl_tree calls this function, but since we don't use the
7063 DECL_LANG_SPECIFIC field, this is a no-op. */
7066 copy_lang_decl (node)
7067 tree node ATTRIBUTE_UNUSED;