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. */
40 extern cpp_reader parse_in;
43 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
45 { NORMAL, /* Ordinary declaration */
46 FUNCDEF, /* Function definition */
47 PARM, /* Declaration of parm before function body */
48 FIELD, /* Declaration inside struct or union */
49 BITFIELD, /* Likewise but with specified width */
50 TYPENAME}; /* Typename (inside cast or sizeof) */
52 #ifndef CHAR_TYPE_SIZE
53 #define CHAR_TYPE_SIZE BITS_PER_UNIT
56 #ifndef SHORT_TYPE_SIZE
57 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
61 #define INT_TYPE_SIZE BITS_PER_WORD
64 #ifndef LONG_TYPE_SIZE
65 #define LONG_TYPE_SIZE BITS_PER_WORD
68 #ifndef LONG_LONG_TYPE_SIZE
69 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
72 #ifndef WCHAR_UNSIGNED
73 #define WCHAR_UNSIGNED 0
76 #ifndef FLOAT_TYPE_SIZE
77 #define FLOAT_TYPE_SIZE BITS_PER_WORD
80 #ifndef DOUBLE_TYPE_SIZE
81 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
84 #ifndef LONG_DOUBLE_TYPE_SIZE
85 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
88 /* We let tm.h override the types used here, to handle trivial differences
89 such as the choice of unsigned int or long unsigned int for size_t.
90 When machines start needing nontrivial differences in the size type,
91 it would be best to do something here to figure out automatically
92 from other information what type to use. */
95 #define SIZE_TYPE "long unsigned int"
99 #define PTRDIFF_TYPE "long int"
103 #define WCHAR_TYPE "int"
106 /* a node which has tree code ERROR_MARK, and whose type is itself.
107 All erroneous expressions are replaced with this node. All functions
108 that accept nodes as arguments should avoid generating error messages
109 if this node is one of the arguments, since it is undesirable to get
110 multiple error messages from one error in the input. */
112 tree error_mark_node;
114 /* These can't be part of the above array, since they are declared
115 individually in tree.h, and used by the debug output routines. */
119 tree integer_type_node;
120 tree unsigned_type_node;
122 /* These can't be part of the above array, since they are declared
123 individially in tree.h and used by the target routines. */
126 tree va_list_type_node;
128 /* Two expressions that are constants with value zero.
129 The first is of type `int', the second of type `void *'. */
131 tree integer_zero_node;
132 tree null_pointer_node;
134 /* A node for the integer constant 1. */
136 tree integer_one_node;
138 /* Nonzero if we have seen an invalid cross reference
139 to a struct, union, or enum, but not yet printed the message. */
141 tree pending_invalid_xref;
142 /* File and line to appear in the eventual error message. */
143 char *pending_invalid_xref_file;
144 int pending_invalid_xref_line;
146 /* While defining an enum type, this is 1 plus the last enumerator
147 constant value. Note that will do not have to save this or `enum_overflow'
148 around nested function definition since such a definition could only
149 occur in an enum value expression and we don't use these variables in
152 static tree enum_next_value;
154 /* Nonzero means that there was overflow computing enum_next_value. */
156 static int enum_overflow;
158 /* Parsing a function declarator leaves a list of parameter names
159 or a chain or parameter decls here. */
161 static tree last_function_parms;
163 /* Parsing a function declarator leaves here a chain of structure
164 and enum types declared in the parmlist. */
166 static tree last_function_parm_tags;
168 /* After parsing the declarator that starts a function definition,
169 `start_function' puts here the list of parameter names or chain of decls.
170 `store_parm_decls' finds it here. */
172 static tree current_function_parms;
174 /* Similar, for last_function_parm_tags. */
175 static tree current_function_parm_tags;
177 /* Similar, for the file and line that the prototype came from if this is
178 an old-style definition. */
179 static char *current_function_prototype_file;
180 static int current_function_prototype_line;
182 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
183 that have names. Here so we can clear out their names' definitions
184 at the end of the function. */
186 static tree named_labels;
188 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
190 static tree shadowed_labels;
192 /* Nonzero when store_parm_decls is called indicates a varargs function.
193 Value not meaningful after store_parm_decls. */
195 static int c_function_varargs;
197 /* The FUNCTION_DECL for the function currently being compiled,
198 or 0 if between functions. */
199 tree current_function_decl;
201 /* Set to 0 at beginning of a function definition, set to 1 if
202 a return statement that specifies a return value is seen. */
204 int current_function_returns_value;
206 /* Set to 0 at beginning of a function definition, set to 1 if
207 a return statement with no argument is seen. */
209 int current_function_returns_null;
211 /* Set to nonzero by `grokdeclarator' for a function
212 whose return type is defaulted, if warnings for this are desired. */
214 static int warn_about_return_type;
216 /* Nonzero when starting a function declared `extern inline'. */
218 static int current_extern_inline;
220 /* For each binding contour we allocate a binding_level structure
221 * which records the names defined in that contour.
224 * 1) one for each function definition,
225 * where internal declarations of the parameters appear.
226 * 2) one for each compound statement,
227 * to record its declarations.
229 * The current meaning of a name can be found by searching the levels from
230 * the current one out to the global one.
233 /* Note that the information in the `names' component of the global contour
234 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
238 /* A chain of _DECL nodes for all variables, constants, functions,
239 and typedef types. These are in the reverse of the order supplied.
243 /* A list of structure, union and enum definitions,
244 * for looking up tag names.
245 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
246 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
247 * or ENUMERAL_TYPE node.
251 /* For each level, a list of shadowed outer-level local definitions
252 to be restored when this level is popped.
253 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
254 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
257 /* For each level (except not the global one),
258 a chain of BLOCK nodes for all the levels
259 that were entered and exited one level down. */
262 /* The BLOCK node for this level, if one has been preallocated.
263 If 0, the BLOCK is allocated (if needed) when the level is popped. */
266 /* The binding level which this one is contained in (inherits from). */
267 struct binding_level *level_chain;
269 /* Nonzero for the level that holds the parameters of a function. */
272 /* Nonzero if this level "doesn't exist" for tags. */
273 char tag_transparent;
275 /* Nonzero if sublevels of this level "don't exist" for tags.
276 This is set in the parm level of a function definition
277 while reading the function body, so that the outermost block
278 of the function body will be tag-transparent. */
279 char subblocks_tag_transparent;
281 /* Nonzero means make a BLOCK for this level regardless of all else. */
284 /* Nonzero means make a BLOCK if this level has any subblocks. */
285 char keep_if_subblocks;
287 /* Number of decls in `names' that have incomplete
288 structure or union types. */
291 /* A list of decls giving the (reversed) specified order of parms,
292 not including any forward-decls in the parmlist.
293 This is so we can put the parms in proper order for assign_parms. */
297 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
299 /* The binding level currently in effect. */
301 static struct binding_level *current_binding_level;
303 /* A chain of binding_level structures awaiting reuse. */
305 static struct binding_level *free_binding_level;
307 /* The outermost binding level, for names of file scope.
308 This is created when the compiler is started and exists
309 through the entire run. */
311 static struct binding_level *global_binding_level;
313 /* Binding level structures are initialized by copying this one. */
315 static struct binding_level clear_binding_level
316 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, 0,
319 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
321 static int keep_next_level_flag;
323 /* Nonzero means make a BLOCK for the next level pushed
324 if it has subblocks. */
326 static int keep_next_if_subblocks;
328 /* The chain of outer levels of label scopes.
329 This uses the same data structure used for binding levels,
330 but it works differently: each link in the chain records
331 saved values of named_labels and shadowed_labels for
332 a label binding level outside the current one. */
334 static struct binding_level *label_level_chain;
336 /* Functions called automatically at the beginning and end of execution. */
338 tree static_ctors, static_dtors;
340 /* Forward declarations. */
342 static struct binding_level * make_binding_level PROTO((void));
343 static void clear_limbo_values PROTO((tree));
344 static int duplicate_decls PROTO((tree, tree, int));
345 static int redeclaration_error_message PROTO((tree, tree));
346 static void storedecls PROTO((tree));
347 static void storetags PROTO((tree));
348 static tree lookup_tag PROTO((enum tree_code, tree,
349 struct binding_level *, int));
350 static tree lookup_tag_reverse PROTO((tree));
351 static tree grokdeclarator PROTO((tree, tree, enum decl_context,
353 static tree grokparms PROTO((tree, int));
354 static int field_decl_cmp PROTO((const GENERIC_PTR, const GENERIC_PTR));
355 static void layout_array_type PROTO((tree));
357 /* C-specific option variables. */
359 /* Nonzero means allow type mismatches in conditional expressions;
360 just make their values `void'. */
362 int flag_cond_mismatch;
364 /* Nonzero means give `double' the same size as `float'. */
366 int flag_short_double;
368 /* Nonzero means don't recognize the keyword `asm'. */
372 /* Nonzero means don't recognize any builtin functions. */
376 /* Nonzero means don't recognize the non-ANSI builtin functions.
379 int flag_no_nonansi_builtin;
381 /* Nonzero means do some things the same way PCC does. */
383 int flag_traditional;
385 /* Nonzero means use the ISO C9x dialect of C. */
389 /* Nonzero means that we have builtin functions, and main is an int */
393 /* Nonzero means to allow single precision math even if we're generally
394 being traditional. */
395 int flag_allow_single_precision = 0;
397 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
399 int flag_signed_bitfields = 1;
400 int explicit_flag_signed_bitfields = 0;
402 /* Nonzero means warn about use of implicit int. */
404 int warn_implicit_int;
406 /* Nonzero means warn about usage of long long when `-pedantic'. */
408 int warn_long_long = 1;
410 /* Nonzero means message about use of implicit function declarations;
411 1 means warning; 2 means error. */
413 int mesg_implicit_function_declaration;
415 /* Nonzero means give string constants the type `const char *'
416 to get extra warnings from them. These warnings will be too numerous
417 to be useful, except in thoroughly ANSIfied programs. */
419 int flag_const_strings;
421 /* Nonzero means warn about pointer casts that can drop a type qualifier
422 from the pointer target type. */
426 /* Nonzero means warn when casting a function call to a type that does
427 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
428 when there is no previous declaration of sqrt or malloc. */
430 int warn_bad_function_cast;
432 /* Warn about functions which might be candidates for attribute noreturn. */
434 int warn_missing_noreturn;
436 /* Warn about traditional constructs whose meanings changed in ANSI C. */
438 int warn_traditional;
440 /* Nonzero means warn about sizeof(function) or addition/subtraction
441 of function pointers. */
443 int warn_pointer_arith;
445 /* Nonzero means warn for non-prototype function decls
446 or non-prototyped defs without previous prototype. */
448 int warn_strict_prototypes;
450 /* Nonzero means warn for any global function def
451 without separate previous prototype decl. */
453 int warn_missing_prototypes;
455 /* Nonzero means warn for any global function def
456 without separate previous decl. */
458 int warn_missing_declarations;
460 /* Nonzero means warn about multiple (redundant) decls for the same single
461 variable or function. */
463 int warn_redundant_decls = 0;
465 /* Nonzero means warn about extern declarations of objects not at
466 file-scope level and about *all* declarations of functions (whether
467 extern or static) not at file-scope level. Note that we exclude
468 implicit function declarations. To get warnings about those, use
471 int warn_nested_externs = 0;
473 /* Warn about *printf or *scanf format/argument anomalies. */
477 /* Warn about a subscript that has type char. */
479 int warn_char_subscripts = 0;
481 /* Warn if a type conversion is done that might have confusing results. */
485 /* Warn if adding () is suggested. */
487 int warn_parentheses;
489 /* Warn if initializer is not completely bracketed. */
491 int warn_missing_braces;
493 /* Warn if main is suspicious. */
497 /* Warn about #pragma directives that are not recognised. */
499 int warn_unknown_pragmas = 0; /* Tri state variable. */
501 /* Warn about comparison of signed and unsigned values.
502 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
504 int warn_sign_compare = -1;
506 /* Nonzero means warn about use of multicharacter literals. */
508 int warn_multichar = 1;
510 /* Nonzero means `$' can be in an identifier. */
512 #ifndef DOLLARS_IN_IDENTIFIERS
513 #define DOLLARS_IN_IDENTIFIERS 1
515 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
517 /* Decode the string P as a language-specific option for C.
518 Return the number of strings consumed. */
521 c_decode_option (argc, argv)
522 int argc ATTRIBUTE_UNUSED;
525 int strings_processed;
528 strings_processed = cpp_handle_option (&parse_in, argc, argv);
530 strings_processed = 0;
531 #endif /* ! USE_CPPLIB */
533 if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
535 flag_traditional = 1;
536 flag_writable_strings = 1;
538 else if (!strcmp (p, "-fallow-single-precision"))
539 flag_allow_single_precision = 1;
540 else if (!strcmp (p, "-fhosted") || !strcmp (p, "-fno-freestanding"))
545 else if (!strcmp (p, "-ffreestanding") || !strcmp (p, "-fno-hosted"))
549 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
553 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
555 flag_traditional = 0;
556 flag_writable_strings = 0;
558 else if (!strncmp (p, "-std=", 5))
560 /* Select the appropriate language standard. We currently
562 -std=iso9899:1990 same as -ansi
563 -std=iso9899:199409 ISO C as modified in amend. 1
564 -std=iso9899:199x ISO C 9x
565 -std=c89 same as -std=iso9899:1990
566 -std=c9x same as -std=iso9899:199x
567 -std=gnu89 default, iso9899:1990 + gnu extensions
568 -std=gnu9x iso9899:199x + gnu extensions
570 const char *argstart = &p[5];
572 if (!strcmp (argstart, "iso9899:1990")
573 || !strcmp (argstart, "c89"))
576 flag_traditional = 0;
577 flag_writable_strings = 0;
579 flag_no_nonansi_builtin = 1;
582 else if (!strcmp (argstart, "iso9899:199409"))
584 /* ??? The changes since ISO C 1990 are not supported. */
587 else if (!strcmp (argstart, "iso9899:199x")
588 || !strcmp (argstart, "c9x"))
590 flag_traditional = 0;
591 flag_writable_strings = 0;
593 flag_no_nonansi_builtin = 1;
596 else if (!strcmp (argstart, "gnu89"))
598 flag_traditional = 0;
599 flag_writable_strings = 0;
601 flag_no_nonansi_builtin = 0;
604 else if (!strcmp (argstart, "gnu9x"))
606 flag_traditional = 0;
607 flag_writable_strings = 0;
609 flag_no_nonansi_builtin = 0;
613 error ("unknown C standard `%s'", argstart);
615 else if (!strcmp (p, "-fdollars-in-identifiers"))
616 dollars_in_ident = 1;
617 else if (!strcmp (p, "-fno-dollars-in-identifiers"))
618 dollars_in_ident = 0;
619 else if (!strcmp (p, "-fsigned-char"))
620 flag_signed_char = 1;
621 else if (!strcmp (p, "-funsigned-char"))
622 flag_signed_char = 0;
623 else if (!strcmp (p, "-fno-signed-char"))
624 flag_signed_char = 0;
625 else if (!strcmp (p, "-fno-unsigned-char"))
626 flag_signed_char = 1;
627 else if (!strcmp (p, "-fsigned-bitfields")
628 || !strcmp (p, "-fno-unsigned-bitfields"))
630 flag_signed_bitfields = 1;
631 explicit_flag_signed_bitfields = 1;
633 else if (!strcmp (p, "-funsigned-bitfields")
634 || !strcmp (p, "-fno-signed-bitfields"))
636 flag_signed_bitfields = 0;
637 explicit_flag_signed_bitfields = 1;
639 else if (!strcmp (p, "-fshort-enums"))
640 flag_short_enums = 1;
641 else if (!strcmp (p, "-fno-short-enums"))
642 flag_short_enums = 0;
643 else if (!strcmp (p, "-fcond-mismatch"))
644 flag_cond_mismatch = 1;
645 else if (!strcmp (p, "-fno-cond-mismatch"))
646 flag_cond_mismatch = 0;
647 else if (!strcmp (p, "-fshort-double"))
648 flag_short_double = 1;
649 else if (!strcmp (p, "-fno-short-double"))
650 flag_short_double = 0;
651 else if (!strcmp (p, "-fasm"))
653 else if (!strcmp (p, "-fno-asm"))
655 else if (!strcmp (p, "-fbuiltin"))
657 else if (!strcmp (p, "-fno-builtin"))
659 else if (!strcmp (p, "-ansi"))
661 else if (!strcmp (p, "-Werror-implicit-function-declaration"))
662 mesg_implicit_function_declaration = 2;
663 else if (!strcmp (p, "-Wimplicit-function-declaration"))
664 mesg_implicit_function_declaration = 1;
665 else if (!strcmp (p, "-Wno-implicit-function-declaration"))
666 mesg_implicit_function_declaration = 0;
667 else if (!strcmp (p, "-Wimplicit-int"))
668 warn_implicit_int = 1;
669 else if (!strcmp (p, "-Wno-implicit-int"))
670 warn_implicit_int = 0;
671 else if (!strcmp (p, "-Wimplicit"))
673 warn_implicit_int = 1;
674 if (mesg_implicit_function_declaration != 2)
675 mesg_implicit_function_declaration = 1;
677 else if (!strcmp (p, "-Wno-implicit"))
678 warn_implicit_int = 0, mesg_implicit_function_declaration = 0;
679 else if (!strcmp (p, "-Wlong-long"))
681 else if (!strcmp (p, "-Wno-long-long"))
683 else if (!strcmp (p, "-Wwrite-strings"))
684 flag_const_strings = 1;
685 else if (!strcmp (p, "-Wno-write-strings"))
686 flag_const_strings = 0;
687 else if (!strcmp (p, "-Wcast-qual"))
689 else if (!strcmp (p, "-Wno-cast-qual"))
691 else if (!strcmp (p, "-Wbad-function-cast"))
692 warn_bad_function_cast = 1;
693 else if (!strcmp (p, "-Wno-bad-function-cast"))
694 warn_bad_function_cast = 0;
695 else if (!strcmp (p, "-Wmissing-noreturn"))
696 warn_missing_noreturn = 1;
697 else if (!strcmp (p, "-Wno-missing-noreturn"))
698 warn_missing_noreturn = 0;
699 else if (!strcmp (p, "-Wpointer-arith"))
700 warn_pointer_arith = 1;
701 else if (!strcmp (p, "-Wno-pointer-arith"))
702 warn_pointer_arith = 0;
703 else if (!strcmp (p, "-Wstrict-prototypes"))
704 warn_strict_prototypes = 1;
705 else if (!strcmp (p, "-Wno-strict-prototypes"))
706 warn_strict_prototypes = 0;
707 else if (!strcmp (p, "-Wmissing-prototypes"))
708 warn_missing_prototypes = 1;
709 else if (!strcmp (p, "-Wno-missing-prototypes"))
710 warn_missing_prototypes = 0;
711 else if (!strcmp (p, "-Wmissing-declarations"))
712 warn_missing_declarations = 1;
713 else if (!strcmp (p, "-Wno-missing-declarations"))
714 warn_missing_declarations = 0;
715 else if (!strcmp (p, "-Wredundant-decls"))
716 warn_redundant_decls = 1;
717 else if (!strcmp (p, "-Wno-redundant-decls"))
718 warn_redundant_decls = 0;
719 else if (!strcmp (p, "-Wnested-externs"))
720 warn_nested_externs = 1;
721 else if (!strcmp (p, "-Wno-nested-externs"))
722 warn_nested_externs = 0;
723 else if (!strcmp (p, "-Wtraditional"))
724 warn_traditional = 1;
725 else if (!strcmp (p, "-Wno-traditional"))
726 warn_traditional = 0;
727 else if (!strcmp (p, "-Wformat"))
729 else if (!strcmp (p, "-Wno-format"))
731 else if (!strcmp (p, "-Wchar-subscripts"))
732 warn_char_subscripts = 1;
733 else if (!strcmp (p, "-Wno-char-subscripts"))
734 warn_char_subscripts = 0;
735 else if (!strcmp (p, "-Wconversion"))
737 else if (!strcmp (p, "-Wno-conversion"))
739 else if (!strcmp (p, "-Wparentheses"))
740 warn_parentheses = 1;
741 else if (!strcmp (p, "-Wno-parentheses"))
742 warn_parentheses = 0;
743 else if (!strcmp (p, "-Wreturn-type"))
744 warn_return_type = 1;
745 else if (!strcmp (p, "-Wno-return-type"))
746 warn_return_type = 0;
747 else if (!strcmp (p, "-Wcomment"))
748 ; /* cpp handles this one. */
749 else if (!strcmp (p, "-Wno-comment"))
750 ; /* cpp handles this one. */
751 else if (!strcmp (p, "-Wcomments"))
752 ; /* cpp handles this one. */
753 else if (!strcmp (p, "-Wno-comments"))
754 ; /* cpp handles this one. */
755 else if (!strcmp (p, "-Wtrigraphs"))
756 ; /* cpp handles this one. */
757 else if (!strcmp (p, "-Wno-trigraphs"))
758 ; /* cpp handles this one. */
759 else if (!strcmp (p, "-Wundef"))
760 ; /* cpp handles this one. */
761 else if (!strcmp (p, "-Wno-undef"))
762 ; /* cpp handles this one. */
763 else if (!strcmp (p, "-Wimport"))
764 ; /* cpp handles this one. */
765 else if (!strcmp (p, "-Wno-import"))
766 ; /* cpp handles this one. */
767 else if (!strcmp (p, "-Wmissing-braces"))
768 warn_missing_braces = 1;
769 else if (!strcmp (p, "-Wno-missing-braces"))
770 warn_missing_braces = 0;
771 else if (!strcmp (p, "-Wmain"))
773 else if (!strcmp (p, "-Wno-main"))
775 else if (!strcmp (p, "-Wsign-compare"))
776 warn_sign_compare = 1;
777 else if (!strcmp (p, "-Wno-sign-compare"))
778 warn_sign_compare = 0;
779 else if (!strcmp (p, "-Wmultichar"))
781 else if (!strcmp (p, "-Wno-multichar"))
783 else if (!strcmp (p, "-Wunknown-pragmas"))
784 /* Set to greater than 1, so that even unknown pragmas in system
785 headers will be warned about. */
786 warn_unknown_pragmas = 2;
787 else if (!strcmp (p, "-Wno-unknown-pragmas"))
788 warn_unknown_pragmas = 0;
789 else if (!strcmp (p, "-Wall"))
791 /* We save the value of warn_uninitialized, since if they put
792 -Wuninitialized on the command line, we need to generate a
793 warning about not using it without also specifying -O. */
794 if (warn_uninitialized != 1)
795 warn_uninitialized = 2;
796 warn_implicit_int = 1;
797 mesg_implicit_function_declaration = 1;
798 warn_return_type = 1;
802 warn_char_subscripts = 1;
803 warn_parentheses = 1;
804 warn_missing_braces = 1;
805 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
806 it off only if it's not explicit. */
808 /* Only warn about unknown pragmas that are not in system headers. */
809 warn_unknown_pragmas = 1;
812 return strings_processed;
817 /* Hooks for print_node. */
820 print_lang_decl (file, node, indent)
821 FILE *file ATTRIBUTE_UNUSED;
822 tree node ATTRIBUTE_UNUSED;
823 int indent ATTRIBUTE_UNUSED;
828 print_lang_type (file, node, indent)
829 FILE *file ATTRIBUTE_UNUSED;
830 tree node ATTRIBUTE_UNUSED;
831 int indent ATTRIBUTE_UNUSED;
836 print_lang_identifier (file, node, indent)
841 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
842 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
843 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
844 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
845 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
846 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
849 /* Hook called at end of compilation to assume 1 elt
850 for a top-level array decl that wasn't complete before. */
853 finish_incomplete_decl (decl)
856 if (TREE_CODE (decl) == VAR_DECL)
858 tree type = TREE_TYPE (decl);
859 if (type != error_mark_node
860 && TREE_CODE (type) == ARRAY_TYPE
861 && TYPE_DOMAIN (type) == 0)
863 if (! DECL_EXTERNAL (decl))
864 warning_with_decl (decl, "array `%s' assumed to have one element");
866 complete_array_type (type, NULL_TREE, 1);
868 layout_decl (decl, 0);
873 /* Create a new `struct binding_level'. */
876 struct binding_level *
877 make_binding_level ()
880 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
883 /* Nonzero if we are currently in the global binding level. */
888 return current_binding_level == global_binding_level;
894 keep_next_level_flag = 1;
897 /* Nonzero if the current level needs to have a BLOCK made. */
902 return ((current_binding_level->keep_if_subblocks
903 && current_binding_level->blocks != 0)
904 || current_binding_level->keep
905 || current_binding_level->names != 0
906 || (current_binding_level->tags != 0
907 && !current_binding_level->tag_transparent));
910 /* Identify this binding level as a level of parameters.
911 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
912 But it turns out there is no way to pass the right value for
913 DEFINITION_FLAG, so we ignore it. */
916 declare_parm_level (definition_flag)
917 int definition_flag ATTRIBUTE_UNUSED;
919 current_binding_level->parm_flag = 1;
922 /* Nonzero if currently making parm declarations. */
927 return current_binding_level->parm_flag;
930 /* Enter a new binding level.
931 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
932 not for that of tags. */
935 pushlevel (tag_transparent)
938 register struct binding_level *newlevel = NULL_BINDING_LEVEL;
940 /* If this is the top level of a function,
941 just make sure that NAMED_LABELS is 0. */
943 if (current_binding_level == global_binding_level)
948 /* Reuse or create a struct for this binding level. */
950 if (free_binding_level)
952 newlevel = free_binding_level;
953 free_binding_level = free_binding_level->level_chain;
957 newlevel = make_binding_level ();
960 /* Add this level to the front of the chain (stack) of levels that
963 *newlevel = clear_binding_level;
964 newlevel->tag_transparent
966 || (current_binding_level
967 ? current_binding_level->subblocks_tag_transparent
969 newlevel->level_chain = current_binding_level;
970 current_binding_level = newlevel;
971 newlevel->keep = keep_next_level_flag;
972 keep_next_level_flag = 0;
973 newlevel->keep_if_subblocks = keep_next_if_subblocks;
974 keep_next_if_subblocks = 0;
977 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
980 clear_limbo_values (block)
985 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
986 if (DECL_NAME (tem) != 0)
987 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
989 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
990 clear_limbo_values (tem);
993 /* Exit a binding level.
994 Pop the level off, and restore the state of the identifier-decl mappings
995 that were in effect when this level was entered.
997 If KEEP is nonzero, this level had explicit declarations, so
998 and create a "block" (a BLOCK node) for the level
999 to record its declarations and subblocks for symbol table output.
1001 If FUNCTIONBODY is nonzero, this level is the body of a function,
1002 so create a block as if KEEP were set and also clear out all
1005 If REVERSE is nonzero, reverse the order of decls before putting
1006 them into the BLOCK. */
1009 poplevel (keep, reverse, functionbody)
1015 /* The chain of decls was accumulated in reverse order.
1016 Put it into forward order, just for cleanliness. */
1018 tree tags = current_binding_level->tags;
1019 tree subblocks = current_binding_level->blocks;
1022 int block_previously_created;
1024 keep |= current_binding_level->keep;
1026 /* This warning is turned off because it causes warnings for
1027 declarations like `extern struct foo *x'. */
1029 /* Warn about incomplete structure types in this level. */
1030 for (link = tags; link; link = TREE_CHAIN (link))
1031 if (TYPE_SIZE (TREE_VALUE (link)) == 0)
1033 tree type = TREE_VALUE (link);
1034 tree type_name = TYPE_NAME (type);
1035 char *id = IDENTIFIER_POINTER (TREE_CODE (type_name) == IDENTIFIER_NODE
1037 : DECL_NAME (type_name));
1038 switch (TREE_CODE (type))
1041 error ("`struct %s' incomplete in scope ending here", id);
1044 error ("`union %s' incomplete in scope ending here", id);
1047 error ("`enum %s' incomplete in scope ending here", id);
1053 /* Get the decls in the order they were written.
1054 Usually current_binding_level->names is in reverse order.
1055 But parameter decls were previously put in forward order. */
1058 current_binding_level->names
1059 = decls = nreverse (current_binding_level->names);
1061 decls = current_binding_level->names;
1063 /* Output any nested inline functions within this block
1064 if they weren't already output. */
1066 for (decl = decls; decl; decl = TREE_CHAIN (decl))
1067 if (TREE_CODE (decl) == FUNCTION_DECL
1068 && ! TREE_ASM_WRITTEN (decl)
1069 && DECL_INITIAL (decl) != 0
1070 && TREE_ADDRESSABLE (decl))
1072 /* If this decl was copied from a file-scope decl
1073 on account of a block-scope extern decl,
1074 propagate TREE_ADDRESSABLE to the file-scope decl.
1076 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1077 true, since then the decl goes through save_for_inline_copying. */
1078 if (DECL_ABSTRACT_ORIGIN (decl) != 0
1079 && DECL_ABSTRACT_ORIGIN (decl) != decl)
1080 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
1081 else if (DECL_SAVED_INSNS (decl) != 0)
1083 push_function_context ();
1084 output_inline_function (decl);
1085 pop_function_context ();
1089 /* If there were any declarations or structure tags in that level,
1090 or if this level is a function body,
1091 create a BLOCK to record them for the life of this function. */
1094 block_previously_created = (current_binding_level->this_block != 0);
1095 if (block_previously_created)
1096 block = current_binding_level->this_block;
1097 else if (keep || functionbody
1098 || (current_binding_level->keep_if_subblocks && subblocks != 0))
1099 block = make_node (BLOCK);
1102 BLOCK_VARS (block) = decls;
1103 BLOCK_TYPE_TAGS (block) = tags;
1104 BLOCK_SUBBLOCKS (block) = subblocks;
1105 remember_end_note (block);
1108 /* In each subblock, record that this is its superior. */
1110 for (link = subblocks; link; link = TREE_CHAIN (link))
1111 BLOCK_SUPERCONTEXT (link) = block;
1113 /* Clear out the meanings of the local variables of this level. */
1115 for (link = decls; link; link = TREE_CHAIN (link))
1117 if (DECL_NAME (link) != 0)
1119 /* If the ident. was used or addressed via a local extern decl,
1120 don't forget that fact. */
1121 if (DECL_EXTERNAL (link))
1123 if (TREE_USED (link))
1124 TREE_USED (DECL_NAME (link)) = 1;
1125 if (TREE_ADDRESSABLE (link))
1126 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1128 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1132 /* Restore all name-meanings of the outer levels
1133 that were shadowed by this level. */
1135 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1136 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1138 /* If the level being exited is the top level of a function,
1139 check over all the labels, and clear out the current
1140 (function local) meanings of their names. */
1144 clear_limbo_values (block);
1146 /* If this is the top level block of a function,
1147 the vars are the function's parameters.
1148 Don't leave them in the BLOCK because they are
1149 found in the FUNCTION_DECL instead. */
1151 BLOCK_VARS (block) = 0;
1153 /* Clear out the definitions of all label names,
1154 since their scopes end here,
1155 and add them to BLOCK_VARS. */
1157 for (link = named_labels; link; link = TREE_CHAIN (link))
1159 register tree label = TREE_VALUE (link);
1161 if (DECL_INITIAL (label) == 0)
1163 error_with_decl (label, "label `%s' used but not defined");
1164 /* Avoid crashing later. */
1165 define_label (input_filename, lineno,
1168 else if (warn_unused && !TREE_USED (label))
1169 warning_with_decl (label, "label `%s' defined but not used");
1170 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1172 /* Put the labels into the "variables" of the
1173 top-level block, so debugger can see them. */
1174 TREE_CHAIN (label) = BLOCK_VARS (block);
1175 BLOCK_VARS (block) = label;
1179 /* Pop the current level, and free the structure for reuse. */
1182 register struct binding_level *level = current_binding_level;
1183 current_binding_level = current_binding_level->level_chain;
1185 level->level_chain = free_binding_level;
1186 free_binding_level = level;
1189 /* Dispose of the block that we just made inside some higher level. */
1191 DECL_INITIAL (current_function_decl) = block;
1194 if (!block_previously_created)
1195 current_binding_level->blocks
1196 = chainon (current_binding_level->blocks, block);
1198 /* If we did not make a block for the level just exited,
1199 any blocks made for inner levels
1200 (since they cannot be recorded as subblocks in that level)
1201 must be carried forward so they will later become subblocks
1202 of something else. */
1204 current_binding_level->blocks
1205 = chainon (current_binding_level->blocks, subblocks);
1207 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1208 binding contour so that they point to the appropriate construct, i.e.
1209 either to the current FUNCTION_DECL node, or else to the BLOCK node
1210 we just constructed.
1212 Note that for tagged types whose scope is just the formal parameter
1213 list for some function type specification, we can't properly set
1214 their TYPE_CONTEXTs here, because we don't have a pointer to the
1215 appropriate FUNCTION_TYPE node readily available to us. For those
1216 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1217 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1218 node which will represent the "scope" for these "parameter list local"
1223 for (link = tags; link; link = TREE_CHAIN (link))
1224 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1226 for (link = tags; link; link = TREE_CHAIN (link))
1227 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1230 TREE_USED (block) = 1;
1234 /* Delete the node BLOCK from the current binding level.
1235 This is used for the block inside a stmt expr ({...})
1236 so that the block can be reinserted where appropriate. */
1239 delete_block (block)
1243 if (current_binding_level->blocks == block)
1244 current_binding_level->blocks = TREE_CHAIN (block);
1245 for (t = current_binding_level->blocks; t;)
1247 if (TREE_CHAIN (t) == block)
1248 TREE_CHAIN (t) = TREE_CHAIN (block);
1252 TREE_CHAIN (block) = NULL;
1253 /* Clear TREE_USED which is always set by poplevel.
1254 The flag is set again if insert_block is called. */
1255 TREE_USED (block) = 0;
1258 /* Insert BLOCK at the end of the list of subblocks of the
1259 current binding level. This is used when a BIND_EXPR is expanded,
1260 to handle the BLOCK node inside the BIND_EXPR. */
1263 insert_block (block)
1266 TREE_USED (block) = 1;
1267 current_binding_level->blocks
1268 = chainon (current_binding_level->blocks, block);
1271 /* Set the BLOCK node for the innermost scope
1272 (the one we are currently in). */
1276 register tree block;
1278 current_binding_level->this_block = block;
1284 register struct binding_level *newlevel;
1286 /* Reuse or create a struct for this binding level. */
1288 if (free_binding_level)
1290 newlevel = free_binding_level;
1291 free_binding_level = free_binding_level->level_chain;
1295 newlevel = make_binding_level ();
1298 /* Add this level to the front of the chain (stack) of label levels. */
1300 newlevel->level_chain = label_level_chain;
1301 label_level_chain = newlevel;
1303 newlevel->names = named_labels;
1304 newlevel->shadowed = shadowed_labels;
1306 shadowed_labels = 0;
1312 register struct binding_level *level = label_level_chain;
1315 /* Clear out the definitions of the declared labels in this level.
1316 Leave in the list any ordinary, non-declared labels. */
1317 for (link = named_labels, prev = 0; link;)
1319 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1321 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1323 error_with_decl (TREE_VALUE (link),
1324 "label `%s' used but not defined");
1325 /* Avoid crashing later. */
1326 define_label (input_filename, lineno,
1327 DECL_NAME (TREE_VALUE (link)));
1329 else if (warn_unused && !TREE_USED (TREE_VALUE (link)))
1330 warning_with_decl (TREE_VALUE (link),
1331 "label `%s' defined but not used");
1332 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1334 /* Delete this element from the list. */
1335 link = TREE_CHAIN (link);
1337 TREE_CHAIN (prev) = link;
1339 named_labels = link;
1344 link = TREE_CHAIN (link);
1348 /* Bring back all the labels that were shadowed. */
1349 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1350 if (DECL_NAME (TREE_VALUE (link)) != 0)
1351 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1352 = TREE_VALUE (link);
1354 named_labels = chainon (named_labels, level->names);
1355 shadowed_labels = level->shadowed;
1357 /* Pop the current level, and free the structure for reuse. */
1358 label_level_chain = label_level_chain->level_chain;
1359 level->level_chain = free_binding_level;
1360 free_binding_level = level;
1363 /* Push a definition or a declaration of struct, union or enum tag "name".
1364 "type" should be the type node.
1365 We assume that the tag "name" is not already defined.
1367 Note that the definition may really be just a forward reference.
1368 In that case, the TYPE_SIZE will be zero. */
1371 pushtag (name, type)
1374 register struct binding_level *b;
1376 /* Find the proper binding level for this type tag. */
1378 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1383 /* Record the identifier as the type's name if it has none. */
1385 if (TYPE_NAME (type) == 0)
1386 TYPE_NAME (type) = name;
1389 if (b == global_binding_level)
1390 b->tags = perm_tree_cons (name, type, b->tags);
1392 b->tags = saveable_tree_cons (name, type, b->tags);
1394 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1395 tagged type we just added to the current binding level. This fake
1396 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1397 to output a representation of a tagged type, and it also gives
1398 us a convenient place to record the "scope start" address for the
1401 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1403 /* An approximation for now, so we can tell this is a function-scope tag.
1404 This will be updated in poplevel. */
1405 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1408 /* Handle when a new declaration NEWDECL
1409 has the same name as an old one OLDDECL
1410 in the same binding contour.
1411 Prints an error message if appropriate.
1413 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1414 Otherwise, return 0.
1416 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1417 and OLDDECL is in an outer binding level and should thus not be changed. */
1420 duplicate_decls (newdecl, olddecl, different_binding_level)
1421 register tree newdecl, olddecl;
1422 int different_binding_level;
1424 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1425 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1426 && DECL_INITIAL (newdecl) != 0);
1427 tree oldtype = TREE_TYPE (olddecl);
1428 tree newtype = TREE_TYPE (newdecl);
1431 if (TREE_CODE_CLASS (TREE_CODE (olddecl)) == 'd')
1432 DECL_MACHINE_ATTRIBUTES (newdecl)
1433 = merge_machine_decl_attributes (olddecl, newdecl);
1435 if (TREE_CODE (newtype) == ERROR_MARK
1436 || TREE_CODE (oldtype) == ERROR_MARK)
1439 /* New decl is completely inconsistent with the old one =>
1440 tell caller to replace the old one.
1441 This is always an error except in the case of shadowing a builtin. */
1442 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1444 if (TREE_CODE (olddecl) == FUNCTION_DECL
1445 && (DECL_BUILT_IN (olddecl)
1446 || DECL_BUILT_IN_NONANSI (olddecl)))
1448 /* If you declare a built-in or predefined function name as static,
1449 the old definition is overridden,
1450 but optionally warn this was a bad choice of name. */
1451 if (!TREE_PUBLIC (newdecl))
1455 else if (DECL_BUILT_IN (olddecl))
1456 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1458 warning_with_decl (newdecl, "shadowing library function `%s'");
1460 /* Likewise, if the built-in is not ansi, then programs can
1461 override it even globally without an error. */
1462 else if (! DECL_BUILT_IN (olddecl))
1463 warning_with_decl (newdecl,
1464 "library function `%s' declared as non-function");
1466 else if (DECL_BUILT_IN_NONANSI (olddecl))
1467 warning_with_decl (newdecl,
1468 "built-in function `%s' declared as non-function");
1470 warning_with_decl (newdecl,
1471 "built-in function `%s' declared as non-function");
1475 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1476 error_with_decl (olddecl, "previous declaration of `%s'");
1482 /* For real parm decl following a forward decl,
1483 return 1 so old decl will be reused. */
1484 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1485 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1488 /* The new declaration is the same kind of object as the old one.
1489 The declarations may partially match. Print warnings if they don't
1490 match enough. Ultimately, copy most of the information from the new
1491 decl to the old one, and keep using the old one. */
1493 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1494 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1495 && DECL_INITIAL (olddecl) == 0)
1496 /* If -traditional, avoid error for redeclaring fcn
1497 after implicit decl. */
1499 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1500 && DECL_BUILT_IN (olddecl))
1502 /* A function declaration for a built-in function. */
1503 if (!TREE_PUBLIC (newdecl))
1505 /* If you declare a built-in function name as static, the
1506 built-in definition is overridden,
1507 but optionally warn this was a bad choice of name. */
1509 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1510 /* Discard the old built-in function. */
1513 else if (!types_match)
1515 /* Accept the return type of the new declaration if same modes. */
1516 tree oldreturntype = TREE_TYPE (oldtype);
1517 tree newreturntype = TREE_TYPE (newtype);
1519 /* Make sure we put the new type in the same obstack as the old ones.
1520 If the old types are not both in the same obstack, use the
1522 if (TYPE_OBSTACK (oldtype) == TYPE_OBSTACK (newtype))
1523 push_obstacks (TYPE_OBSTACK (oldtype), TYPE_OBSTACK (oldtype));
1526 push_obstacks_nochange ();
1527 end_temporary_allocation ();
1530 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1532 /* Function types may be shared, so we can't just modify
1533 the return type of olddecl's function type. */
1535 = build_function_type (newreturntype,
1536 TYPE_ARG_TYPES (oldtype));
1538 types_match = comptypes (newtype, trytype);
1542 /* Accept harmless mismatch in first argument type also.
1544 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1545 && TYPE_ARG_TYPES (oldtype) != 0
1546 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1547 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1548 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1549 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1551 /* Function types may be shared, so we can't just modify
1552 the return type of olddecl's function type. */
1554 = build_function_type (TREE_TYPE (oldtype),
1555 tree_cons (NULL_TREE,
1556 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1557 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1559 types_match = comptypes (newtype, trytype);
1563 if (! different_binding_level)
1564 TREE_TYPE (olddecl) = oldtype;
1570 /* If types don't match for a built-in, throw away the built-in. */
1571 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1575 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1576 && DECL_SOURCE_LINE (olddecl) == 0)
1578 /* A function declaration for a predeclared function
1579 that isn't actually built in. */
1580 if (!TREE_PUBLIC (newdecl))
1582 /* If you declare it as static, the
1583 default definition is overridden. */
1586 else if (!types_match)
1588 /* If the types don't match, preserve volatility indication.
1589 Later on, we will discard everything else about the
1590 default declaration. */
1591 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1594 /* Permit char *foo () to match void *foo (...) if not pedantic,
1595 if one of them came from a system header file. */
1596 else if (!types_match
1597 && TREE_CODE (olddecl) == FUNCTION_DECL
1598 && TREE_CODE (newdecl) == FUNCTION_DECL
1599 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1600 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1601 && (DECL_IN_SYSTEM_HEADER (olddecl)
1602 || DECL_IN_SYSTEM_HEADER (newdecl))
1603 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1604 && TYPE_ARG_TYPES (oldtype) == 0
1605 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1606 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1608 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1609 && TYPE_ARG_TYPES (newtype) == 0
1610 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1611 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1614 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1615 /* Make sure we keep void * as ret type, not char *. */
1616 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1617 TREE_TYPE (newdecl) = newtype = oldtype;
1619 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1620 we will come back here again. */
1621 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1623 else if (!types_match
1624 /* Permit char *foo (int, ...); followed by char *foo ();
1626 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1628 /* Return types must still match. */
1629 && comptypes (TREE_TYPE (oldtype),
1630 TREE_TYPE (newtype))
1631 && TYPE_ARG_TYPES (newtype) == 0))
1633 error_with_decl (newdecl, "conflicting types for `%s'");
1634 /* Check for function type mismatch
1635 involving an empty arglist vs a nonempty one. */
1636 if (TREE_CODE (olddecl) == FUNCTION_DECL
1637 && comptypes (TREE_TYPE (oldtype),
1638 TREE_TYPE (newtype))
1639 && ((TYPE_ARG_TYPES (oldtype) == 0
1640 && DECL_INITIAL (olddecl) == 0)
1642 (TYPE_ARG_TYPES (newtype) == 0
1643 && DECL_INITIAL (newdecl) == 0)))
1645 /* Classify the problem further. */
1646 register tree t = TYPE_ARG_TYPES (oldtype);
1648 t = TYPE_ARG_TYPES (newtype);
1649 for (; t; t = TREE_CHAIN (t))
1651 register tree type = TREE_VALUE (t);
1653 if (TREE_CHAIN (t) == 0
1654 && TYPE_MAIN_VARIANT (type) != void_type_node)
1656 error ("A parameter list with an ellipsis can't match an empty parameter name list declaration.");
1660 if (TYPE_MAIN_VARIANT (type) == float_type_node
1661 || C_PROMOTING_INTEGER_TYPE_P (type))
1663 error ("An argument type that has a default promotion can't match an empty parameter name list declaration.");
1668 error_with_decl (olddecl, "previous declaration of `%s'");
1672 errmsg = redeclaration_error_message (newdecl, olddecl);
1678 error_with_decl (newdecl, "redefinition of `%s'");
1681 error_with_decl (newdecl, "redeclaration of `%s'");
1684 error_with_decl (newdecl, "conflicting declarations of `%s'");
1690 error_with_decl (olddecl,
1691 ((DECL_INITIAL (olddecl)
1692 && current_binding_level == global_binding_level)
1693 ? "`%s' previously defined here"
1694 : "`%s' previously declared here"));
1696 else if (TREE_CODE (newdecl) == TYPE_DECL
1697 && (DECL_IN_SYSTEM_HEADER (olddecl)
1698 || DECL_IN_SYSTEM_HEADER (newdecl)))
1700 warning_with_decl (newdecl, "redefinition of `%s'");
1703 ((DECL_INITIAL (olddecl)
1704 && current_binding_level == global_binding_level)
1705 ? "`%s' previously defined here"
1706 : "`%s' previously declared here"));
1708 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1709 && DECL_INITIAL (olddecl) != 0
1710 && TYPE_ARG_TYPES (oldtype) == 0
1711 && TYPE_ARG_TYPES (newtype) != 0
1712 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1714 register tree type, parm;
1716 /* Prototype decl follows defn w/o prototype. */
1718 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1719 type = TYPE_ARG_TYPES (newtype),
1722 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1724 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1725 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1727 warning_with_decl (newdecl, "prototype for `%s' follows");
1728 warning_with_decl (olddecl, "non-prototype definition here");
1731 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1732 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1734 error_with_decl (newdecl, "prototype for `%s' follows and number of arguments doesn't match");
1735 error_with_decl (olddecl, "non-prototype definition here");
1739 /* Type for passing arg must be consistent
1740 with that declared for the arg. */
1741 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1742 /* If -traditional, allow `unsigned int' instead of `int'
1743 in the prototype. */
1744 && (! (flag_traditional
1745 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1746 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1748 error_with_decl (newdecl,
1749 "prototype for `%s' follows and argument %d doesn't match",
1751 error_with_decl (olddecl, "non-prototype definition here");
1757 /* Warn about mismatches in various flags. */
1760 /* Warn if function is now inline
1761 but was previously declared not inline and has been called. */
1762 if (TREE_CODE (olddecl) == FUNCTION_DECL
1763 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1764 && TREE_USED (olddecl))
1765 warning_with_decl (newdecl,
1766 "`%s' declared inline after being called");
1767 if (TREE_CODE (olddecl) == FUNCTION_DECL
1768 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1769 && DECL_INITIAL (olddecl) != 0)
1770 warning_with_decl (newdecl,
1771 "`%s' declared inline after its definition");
1773 /* If pedantic, warn when static declaration follows a non-static
1774 declaration. Otherwise, do so only for functions. */
1775 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1776 && TREE_PUBLIC (olddecl)
1777 && !TREE_PUBLIC (newdecl))
1778 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1780 /* If warn_traditional, warn when a non-static function
1781 declaration follows a static one. */
1782 if (warn_traditional
1783 && TREE_CODE (olddecl) == FUNCTION_DECL
1784 && !TREE_PUBLIC (olddecl)
1785 && TREE_PUBLIC (newdecl))
1786 warning_with_decl (newdecl, "non-static declaration for `%s' follows static");
1788 /* Warn when const declaration follows a non-const
1789 declaration, but not for functions. */
1790 if (TREE_CODE (olddecl) != FUNCTION_DECL
1791 && !TREE_READONLY (olddecl)
1792 && TREE_READONLY (newdecl))
1793 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1794 /* These bits are logically part of the type, for variables.
1795 But not for functions
1796 (where qualifiers are not valid ANSI anyway). */
1797 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1798 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1799 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1800 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1804 /* Optionally warn about more than one declaration for the same name. */
1805 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1806 /* Don't warn about a function declaration
1807 followed by a definition. */
1808 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1809 && DECL_INITIAL (olddecl) == 0)
1810 /* Don't warn about extern decl followed by (tentative) definition. */
1811 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1813 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1814 warning_with_decl (olddecl, "previous declaration of `%s'");
1817 /* Copy all the DECL_... slots specified in the new decl
1818 except for any that we copy here from the old type.
1820 Past this point, we don't change OLDTYPE and NEWTYPE
1821 even if we change the types of NEWDECL and OLDDECL. */
1825 /* When copying info to olddecl, we store into write_olddecl
1826 instead. This allows us to avoid modifying olddecl when
1827 different_binding_level is true. */
1828 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1830 /* Make sure we put the new type in the same obstack as the old ones.
1831 If the old types are not both in the same obstack, use the permanent
1833 if (TYPE_OBSTACK (oldtype) == TYPE_OBSTACK (newtype))
1834 push_obstacks (TYPE_OBSTACK (oldtype), TYPE_OBSTACK (oldtype));
1837 push_obstacks_nochange ();
1838 end_temporary_allocation ();
1841 /* Merge the data types specified in the two decls. */
1842 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1844 if (different_binding_level)
1846 = build_type_attribute_variant
1848 merge_attributes (TYPE_ATTRIBUTES (newtype),
1849 TYPE_ATTRIBUTES (oldtype)));
1852 = TREE_TYPE (olddecl)
1853 = common_type (newtype, oldtype);
1856 /* Lay the type out, unless already done. */
1857 if (oldtype != TREE_TYPE (newdecl))
1859 if (TREE_TYPE (newdecl) != error_mark_node)
1860 layout_type (TREE_TYPE (newdecl));
1861 if (TREE_CODE (newdecl) != FUNCTION_DECL
1862 && TREE_CODE (newdecl) != TYPE_DECL
1863 && TREE_CODE (newdecl) != CONST_DECL)
1864 layout_decl (newdecl, 0);
1868 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1869 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1870 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1871 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1872 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1875 /* Keep the old rtl since we can safely use it. */
1876 DECL_RTL (newdecl) = DECL_RTL (olddecl);
1878 /* Merge the type qualifiers. */
1879 if (DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1880 && !TREE_THIS_VOLATILE (newdecl))
1881 TREE_THIS_VOLATILE (write_olddecl) = 0;
1882 if (TREE_READONLY (newdecl))
1883 TREE_READONLY (write_olddecl) = 1;
1884 if (TREE_THIS_VOLATILE (newdecl))
1886 TREE_THIS_VOLATILE (write_olddecl) = 1;
1887 if (TREE_CODE (newdecl) == VAR_DECL)
1888 make_var_volatile (newdecl);
1891 /* Keep source location of definition rather than declaration. */
1892 /* When called with different_binding_level set, keep the old
1893 information so that meaningful diagnostics can be given. */
1894 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1895 && ! different_binding_level)
1897 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1898 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1901 /* Merge the unused-warning information. */
1902 if (DECL_IN_SYSTEM_HEADER (olddecl))
1903 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1904 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1905 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1907 /* Merge the initialization information. */
1908 /* When called with different_binding_level set, don't copy over
1909 DECL_INITIAL, so that we don't accidentally change function
1910 declarations into function definitions. */
1911 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1912 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1914 /* Merge the section attribute.
1915 We want to issue an error if the sections conflict but that must be
1916 done later in decl_attributes since we are called before attributes
1918 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1919 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1921 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1923 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1924 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1926 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1927 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1928 DECL_NO_CHECK_MEMORY_USAGE (newdecl)
1929 |= DECL_NO_CHECK_MEMORY_USAGE (olddecl);
1934 /* If cannot merge, then use the new type and qualifiers,
1935 and don't preserve the old rtl. */
1936 else if (! different_binding_level)
1938 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1939 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1940 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1941 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1944 /* Merge the storage class information. */
1945 DECL_WEAK (newdecl) |= DECL_WEAK (olddecl);
1946 /* For functions, static overrides non-static. */
1947 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1949 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1950 /* This is since we don't automatically
1951 copy the attributes of NEWDECL into OLDDECL. */
1952 /* No need to worry about different_binding_level here because
1953 then TREE_PUBLIC (newdecl) was true. */
1954 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1955 /* If this clears `static', clear it in the identifier too. */
1956 if (! TREE_PUBLIC (olddecl))
1957 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1959 if (DECL_EXTERNAL (newdecl))
1961 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1962 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1963 /* An extern decl does not override previous storage class. */
1964 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1965 if (! DECL_EXTERNAL (newdecl))
1966 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1970 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1971 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1974 /* If either decl says `inline', this fn is inline,
1975 unless its definition was passed already. */
1976 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
1977 DECL_INLINE (olddecl) = 1;
1978 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1980 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1982 if (DECL_BUILT_IN (olddecl))
1984 /* Get rid of any built-in function if new arg types don't match it
1985 or if we have a function definition. */
1986 if (! types_match || new_is_definition)
1988 if (! different_binding_level)
1990 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1991 DECL_BUILT_IN (olddecl) = 0;
1996 /* If redeclaring a builtin function, and not a definition,
1997 it stays built in. */
1998 DECL_BUILT_IN (newdecl) = 1;
1999 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2002 /* Also preserve various other info from the definition. */
2003 else if (! new_is_definition)
2004 DECL_FRAME_SIZE (newdecl) = DECL_FRAME_SIZE (olddecl);
2005 if (! new_is_definition)
2007 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2008 /* When called with different_binding_level set, don't copy over
2009 DECL_INITIAL, so that we don't accidentally change function
2010 declarations into function definitions. */
2011 if (! different_binding_level)
2012 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2013 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
2014 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2015 if (DECL_INLINE (newdecl))
2016 DECL_ABSTRACT_ORIGIN (newdecl) = DECL_ORIGIN (olddecl);
2019 if (different_binding_level)
2021 /* Don't output a duplicate symbol or debugging information for this
2024 Do not set TREE_ASM_WRITTEN for a FUNCTION_DECL since we may actually
2025 just have two declarations without a definition. VAR_DECLs may need
2026 the same treatment, I'm not sure. */
2027 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2028 DECL_IGNORED_P (newdecl) = 1;
2030 TREE_ASM_WRITTEN (newdecl) = DECL_IGNORED_P (newdecl) = 1;
2034 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2035 But preserve OLDDECL's DECL_UID. */
2037 register unsigned olddecl_uid = DECL_UID (olddecl);
2039 bcopy ((char *) newdecl + sizeof (struct tree_common),
2040 (char *) olddecl + sizeof (struct tree_common),
2041 sizeof (struct tree_decl) - sizeof (struct tree_common));
2042 DECL_UID (olddecl) = olddecl_uid;
2045 /* NEWDECL contains the merged attribute lists.
2046 Update OLDDECL to be the same. */
2047 DECL_MACHINE_ATTRIBUTES (olddecl) = DECL_MACHINE_ATTRIBUTES (newdecl);
2052 /* Record a decl-node X as belonging to the current lexical scope.
2053 Check for errors (such as an incompatible declaration for the same
2054 name already seen in the same scope).
2056 Returns either X or an old decl for the same name.
2057 If an old decl is returned, it may have been smashed
2058 to agree with what X says. */
2065 register tree name = DECL_NAME (x);
2066 register struct binding_level *b = current_binding_level;
2068 DECL_CONTEXT (x) = current_function_decl;
2069 /* A local extern declaration for a function doesn't constitute nesting.
2070 A local auto declaration does, since it's a forward decl
2071 for a nested function coming later. */
2072 if (TREE_CODE (x) == FUNCTION_DECL && DECL_INITIAL (x) == 0
2073 && DECL_EXTERNAL (x))
2074 DECL_CONTEXT (x) = 0;
2076 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
2077 && x != IDENTIFIER_IMPLICIT_DECL (name)
2078 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
2079 && !DECL_IN_SYSTEM_HEADER (x))
2080 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
2086 int different_binding_level = 0;
2088 t = lookup_name_current_level (name);
2089 /* Don't type check externs here when -traditional. This is so that
2090 code with conflicting declarations inside blocks will get warnings
2091 not errors. X11 for instance depends on this. */
2092 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
2094 t = IDENTIFIER_GLOBAL_VALUE (name);
2095 /* Type decls at global scope don't conflict with externs declared
2096 inside lexical blocks. */
2097 if (t && TREE_CODE (t) == TYPE_DECL)
2099 different_binding_level = 1;
2101 if (t != 0 && t == error_mark_node)
2102 /* error_mark_node is 0 for a while during initialization! */
2105 error_with_decl (x, "`%s' used prior to declaration");
2110 file = DECL_SOURCE_FILE (t);
2111 line = DECL_SOURCE_LINE (t);
2114 /* If this decl is `static' and an implicit decl was seen previously,
2115 warn. But don't complain if -traditional,
2116 since traditional compilers don't complain. */
2117 if (! flag_traditional && TREE_PUBLIC (name)
2118 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2119 sets this for all functions. */
2120 && ! TREE_PUBLIC (x)
2121 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2122 /* We used to warn also for explicit extern followed by static,
2123 but sometimes you need to do it that way. */
2124 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2126 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2127 IDENTIFIER_POINTER (name));
2128 pedwarn_with_file_and_line
2129 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2130 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2131 "previous declaration of `%s'",
2132 IDENTIFIER_POINTER (name));
2133 TREE_THIS_VOLATILE (name) = 1;
2136 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2138 if (TREE_CODE (t) == PARM_DECL)
2140 /* Don't allow more than one "real" duplicate
2141 of a forward parm decl. */
2142 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2148 /* If we are processing a typedef statement, generate a whole new
2149 ..._TYPE node (which will be just an variant of the existing
2150 ..._TYPE node with identical properties) and then install the
2151 TYPE_DECL node generated to represent the typedef name as the
2152 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2154 The whole point here is to end up with a situation where each
2155 and every ..._TYPE node the compiler creates will be uniquely
2156 associated with AT MOST one node representing a typedef name.
2157 This way, even though the compiler substitutes corresponding
2158 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2159 early on, later parts of the compiler can always do the reverse
2160 translation and get back the corresponding typedef name. For
2163 typedef struct S MY_TYPE;
2166 Later parts of the compiler might only know that `object' was of
2167 type `struct S' if it were not for code just below. With this
2168 code however, later parts of the compiler see something like:
2170 struct S' == struct S
2171 typedef struct S' MY_TYPE;
2174 And they can then deduce (from the node for type struct S') that
2175 the original object declaration was:
2179 Being able to do this is important for proper support of protoize,
2180 and also for generating precise symbolic debugging information
2181 which takes full account of the programmer's (typedef) vocabulary.
2183 Obviously, we don't want to generate a duplicate ..._TYPE node if
2184 the TYPE_DECL node that we are now processing really represents a
2185 standard built-in type.
2187 Since all standard types are effectively declared at line zero
2188 in the source file, we can easily check to see if we are working
2189 on a standard type by checking the current value of lineno. */
2191 if (TREE_CODE (x) == TYPE_DECL)
2193 if (DECL_SOURCE_LINE (x) == 0)
2195 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2196 TYPE_NAME (TREE_TYPE (x)) = x;
2198 else if (TREE_TYPE (x) != error_mark_node
2199 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2201 tree tt = TREE_TYPE (x);
2202 DECL_ORIGINAL_TYPE (x) = tt;
2203 tt = build_type_copy (tt);
2209 /* Multiple external decls of the same identifier ought to match.
2210 Check against both global declarations (when traditional) and out of
2211 scope (limbo) block level declarations.
2213 We get warnings about inline functions where they are defined.
2214 Avoid duplicate warnings where they are used. */
2215 if (TREE_PUBLIC (x) && ! DECL_INLINE (x))
2219 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2220 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2221 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2222 decl = IDENTIFIER_GLOBAL_VALUE (name);
2223 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2224 /* Decls in limbo are always extern, so no need to check that. */
2225 decl = IDENTIFIER_LIMBO_VALUE (name);
2229 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2230 /* If old decl is built-in, we already warned if we should. */
2231 && !DECL_BUILT_IN (decl))
2233 pedwarn_with_decl (x,
2234 "type mismatch with previous external decl");
2235 pedwarn_with_decl (decl, "previous external decl of `%s'");
2239 /* If a function has had an implicit declaration, and then is defined,
2240 make sure they are compatible. */
2242 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2243 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2244 && TREE_CODE (x) == FUNCTION_DECL
2245 && ! comptypes (TREE_TYPE (x),
2246 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2248 warning_with_decl (x, "type mismatch with previous implicit declaration");
2249 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2250 "previous implicit declaration of `%s'");
2253 /* In PCC-compatibility mode, extern decls of vars with no current decl
2254 take effect at top level no matter where they are. */
2255 if (flag_traditional && DECL_EXTERNAL (x)
2256 && lookup_name (name) == 0)
2258 tree type = TREE_TYPE (x);
2260 /* But don't do this if the type contains temporary nodes. */
2263 if (type == error_mark_node)
2265 if (! TREE_PERMANENT (type))
2267 warning_with_decl (x, "type of external `%s' is not global");
2268 /* By exiting the loop early, we leave TYPE nonzero,
2269 and thus prevent globalization of the decl. */
2272 else if (TREE_CODE (type) == FUNCTION_TYPE
2273 && TYPE_ARG_TYPES (type) != 0)
2274 /* The types might not be truly local,
2275 but the list of arg types certainly is temporary.
2276 Since prototypes are nontraditional,
2277 ok not to do the traditional thing. */
2279 type = TREE_TYPE (type);
2283 b = global_binding_level;
2286 /* This name is new in its binding level.
2287 Install the new declaration and return it. */
2288 if (b == global_binding_level)
2290 /* Install a global value. */
2292 /* If the first global decl has external linkage,
2293 warn if we later see static one. */
2294 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2295 TREE_PUBLIC (name) = 1;
2297 IDENTIFIER_GLOBAL_VALUE (name) = x;
2299 /* We no longer care about any previous block level declarations. */
2300 IDENTIFIER_LIMBO_VALUE (name) = 0;
2302 /* Don't forget if the function was used via an implicit decl. */
2303 if (IDENTIFIER_IMPLICIT_DECL (name)
2304 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2305 TREE_USED (x) = 1, TREE_USED (name) = 1;
2307 /* Don't forget if its address was taken in that way. */
2308 if (IDENTIFIER_IMPLICIT_DECL (name)
2309 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2310 TREE_ADDRESSABLE (x) = 1;
2312 /* Warn about mismatches against previous implicit decl. */
2313 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2314 /* If this real decl matches the implicit, don't complain. */
2315 && ! (TREE_CODE (x) == FUNCTION_DECL
2316 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2317 == integer_type_node)))
2318 pedwarn ("`%s' was previously implicitly declared to return `int'",
2319 IDENTIFIER_POINTER (name));
2321 /* If this decl is `static' and an `extern' was seen previously,
2322 that is erroneous. */
2323 if (TREE_PUBLIC (name)
2324 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2326 /* Okay to redeclare an ANSI built-in as static. */
2327 if (t != 0 && DECL_BUILT_IN (t))
2329 /* Okay to declare a non-ANSI built-in as anything. */
2330 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2332 /* Okay to have global type decl after an earlier extern
2333 declaration inside a lexical block. */
2334 else if (TREE_CODE (x) == TYPE_DECL)
2336 else if (IDENTIFIER_IMPLICIT_DECL (name))
2338 if (! TREE_THIS_VOLATILE (name))
2339 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2340 IDENTIFIER_POINTER (name));
2343 pedwarn ("`%s' was declared `extern' and later `static'",
2344 IDENTIFIER_POINTER (name));
2349 /* Here to install a non-global value. */
2350 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2351 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2352 IDENTIFIER_LOCAL_VALUE (name) = x;
2354 /* If this is an extern function declaration, see if we
2355 have a global definition or declaration for the function. */
2357 && DECL_EXTERNAL (x) && !DECL_INLINE (x)
2359 && TREE_CODE (x) == FUNCTION_DECL
2360 && TREE_CODE (oldglobal) == FUNCTION_DECL)
2362 /* We have one. Their types must agree. */
2363 if (! comptypes (TREE_TYPE (x),
2364 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2365 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2368 /* Inner extern decl is inline if global one is.
2369 Copy enough to really inline it. */
2370 if (DECL_INLINE (oldglobal))
2372 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2373 DECL_INITIAL (x) = (current_function_decl == oldglobal
2374 ? 0 : DECL_INITIAL (oldglobal));
2375 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2376 DECL_FRAME_SIZE (x) = DECL_FRAME_SIZE (oldglobal);
2377 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2378 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2379 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2380 DECL_ABSTRACT_ORIGIN (x) = DECL_ORIGIN (oldglobal);
2382 /* Inner extern decl is built-in if global one is. */
2383 if (DECL_BUILT_IN (oldglobal))
2385 DECL_BUILT_IN (x) = DECL_BUILT_IN (oldglobal);
2386 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2388 /* Keep the arg types from a file-scope fcn defn. */
2389 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2390 && DECL_INITIAL (oldglobal)
2391 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2392 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2396 #if 0 /* This case is probably sometimes the right thing to do. */
2397 /* If we have a local external declaration,
2398 then any file-scope declaration should not
2399 have been static. */
2400 if (oldlocal == 0 && oldglobal != 0
2401 && !TREE_PUBLIC (oldglobal)
2402 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2403 warning ("`%s' locally external but globally static",
2404 IDENTIFIER_POINTER (name));
2407 /* If we have a local external declaration,
2408 and no file-scope declaration has yet been seen,
2409 then if we later have a file-scope decl it must not be static. */
2411 && DECL_EXTERNAL (x)
2415 TREE_PUBLIC (name) = 1;
2417 /* Save this decl, so that we can do type checking against
2418 other decls after it falls out of scope.
2420 Only save it once. This prevents temporary decls created in
2421 expand_inline_function from being used here, since this
2422 will have been set when the inline function was parsed.
2423 It also helps give slightly better warnings. */
2424 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2425 IDENTIFIER_LIMBO_VALUE (name) = x;
2428 /* Warn if shadowing an argument at the top level of the body. */
2429 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2430 /* This warning doesn't apply to the parms of a nested fcn. */
2431 && ! current_binding_level->parm_flag
2432 /* Check that this is one level down from the parms. */
2433 && current_binding_level->level_chain->parm_flag
2434 /* Check that the decl being shadowed
2435 comes from the parm level, one level up. */
2436 && chain_member (oldlocal, current_binding_level->level_chain->names))
2438 if (TREE_CODE (oldlocal) == PARM_DECL)
2439 pedwarn ("declaration of `%s' shadows a parameter",
2440 IDENTIFIER_POINTER (name));
2442 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2443 IDENTIFIER_POINTER (name));
2446 /* Maybe warn if shadowing something else. */
2447 else if (warn_shadow && !DECL_EXTERNAL (x)
2448 /* No shadow warnings for internally generated vars. */
2449 && DECL_SOURCE_LINE (x) != 0
2450 /* No shadow warnings for vars made for inlining. */
2451 && ! DECL_FROM_INLINE (x))
2453 char *id = IDENTIFIER_POINTER (name);
2455 if (TREE_CODE (x) == PARM_DECL
2456 && current_binding_level->level_chain->parm_flag)
2457 /* Don't warn about the parm names in function declarator
2458 within a function declarator.
2459 It would be nice to avoid warning in any function
2460 declarator in a declaration, as opposed to a definition,
2461 but there is no way to tell it's not a definition. */
2463 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2464 warning ("declaration of `%s' shadows a parameter", id);
2465 else if (oldlocal != 0)
2466 warning ("declaration of `%s' shadows previous local", id);
2467 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2468 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2469 warning ("declaration of `%s' shadows global declaration", id);
2472 /* If storing a local value, there may already be one (inherited).
2473 If so, record it for restoration when this binding level ends. */
2475 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2478 /* Keep count of variables in this level with incomplete type. */
2479 if (TYPE_SIZE (TREE_TYPE (x)) == 0)
2483 /* Put decls on list in reverse order.
2484 We will reverse them later if necessary. */
2485 TREE_CHAIN (x) = b->names;
2491 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2494 pushdecl_top_level (x)
2498 register struct binding_level *b = current_binding_level;
2500 current_binding_level = global_binding_level;
2502 current_binding_level = b;
2506 /* Generate an implicit declaration for identifier FUNCTIONID
2507 as a function of type int (). Print a warning if appropriate. */
2510 implicitly_declare (functionid)
2514 int traditional_warning = 0;
2515 /* Only one "implicit declaration" warning per identifier. */
2516 int implicit_warning;
2518 /* Save the decl permanently so we can warn if definition follows. */
2519 push_obstacks_nochange ();
2520 end_temporary_allocation ();
2522 /* We used to reuse an old implicit decl here,
2523 but this loses with inline functions because it can clobber
2524 the saved decl chains. */
2525 /* if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2526 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2528 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2530 /* Warn of implicit decl following explicit local extern decl.
2531 This is probably a program designed for traditional C. */
2532 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2533 traditional_warning = 1;
2535 /* Warn once of an implicit declaration. */
2536 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2538 DECL_EXTERNAL (decl) = 1;
2539 TREE_PUBLIC (decl) = 1;
2541 /* Record that we have an implicit decl and this is it. */
2542 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2544 /* ANSI standard says implicit declarations are in the innermost block.
2545 So we record the decl in the standard fashion.
2546 If flag_traditional is set, pushdecl does it top-level. */
2549 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2550 maybe_objc_check_decl (decl);
2552 rest_of_decl_compilation (decl, NULL_PTR, 0, 0);
2554 if (mesg_implicit_function_declaration && implicit_warning)
2556 if (mesg_implicit_function_declaration == 2)
2557 error ("implicit declaration of function `%s'",
2558 IDENTIFIER_POINTER (functionid));
2560 warning ("implicit declaration of function `%s'",
2561 IDENTIFIER_POINTER (functionid));
2563 else if (warn_traditional && traditional_warning)
2564 warning ("function `%s' was previously declared within a block",
2565 IDENTIFIER_POINTER (functionid));
2567 /* Write a record describing this implicit function declaration to the
2568 prototypes file (if requested). */
2570 gen_aux_info_record (decl, 0, 1, 0);
2577 /* Return zero if the declaration NEWDECL is valid
2578 when the declaration OLDDECL (assumed to be for the same name)
2579 has already been seen.
2580 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
2581 and 3 if it is a conflicting declaration. */
2584 redeclaration_error_message (newdecl, olddecl)
2585 tree newdecl, olddecl;
2587 if (TREE_CODE (newdecl) == TYPE_DECL)
2589 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2591 /* pushdecl creates distinct types for TYPE_DECLs by calling
2592 build_type_copy, so the above comparison generally fails. We do
2593 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2594 is equivalent to what this code used to do before the build_type_copy
2595 call. The variant type distinction should not matter for traditional
2596 code, because it doesn't have type qualifiers. */
2597 if (flag_traditional
2598 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
2600 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2604 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2606 /* Declarations of functions can insist on internal linkage
2607 but they can't be inconsistent with internal linkage,
2608 so there can be no error on that account.
2609 However defining the same name twice is no good. */
2610 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2611 /* However, defining once as extern inline and a second
2612 time in another way is ok. */
2613 && !(DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2614 && !(DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2618 else if (current_binding_level == global_binding_level)
2620 /* Objects declared at top level: */
2621 /* If at least one is a reference, it's ok. */
2622 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2624 /* Reject two definitions. */
2625 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2627 /* Now we have two tentative defs, or one tentative and one real def. */
2628 /* Insist that the linkage match. */
2629 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2633 else if (current_binding_level->parm_flag
2634 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2638 /* Newdecl has block scope. If olddecl has block scope also, then
2639 reject two definitions, and reject a definition together with an
2640 external reference. Otherwise, it is OK, because newdecl must
2641 be an extern reference to olddecl. */
2642 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2643 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2649 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2650 Create one if none exists so far for the current function.
2651 This function is called for both label definitions and label references. */
2657 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2659 if (current_function_decl == 0)
2661 error ("label %s referenced outside of any function",
2662 IDENTIFIER_POINTER (id));
2666 /* Use a label already defined or ref'd with this name. */
2669 /* But not if it is inherited and wasn't declared to be inheritable. */
2670 if (DECL_CONTEXT (decl) != current_function_decl
2671 && ! C_DECLARED_LABEL_FLAG (decl))
2672 return shadow_label (id);
2676 decl = build_decl (LABEL_DECL, id, void_type_node);
2678 /* Make sure every label has an rtx. */
2681 /* A label not explicitly declared must be local to where it's ref'd. */
2682 DECL_CONTEXT (decl) = current_function_decl;
2684 DECL_MODE (decl) = VOIDmode;
2686 /* Say where one reference is to the label,
2687 for the sake of the error if it is not defined. */
2688 DECL_SOURCE_LINE (decl) = lineno;
2689 DECL_SOURCE_FILE (decl) = input_filename;
2691 IDENTIFIER_LABEL_VALUE (id) = decl;
2693 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2698 /* Make a label named NAME in the current function,
2699 shadowing silently any that may be inherited from containing functions
2700 or containing scopes.
2702 Note that valid use, if the label being shadowed
2703 comes from another scope in the same function,
2704 requires calling declare_nonlocal_label right away. */
2710 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2716 /* Check to make sure that the label hasn't already been declared
2717 at this label scope */
2718 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2719 if (TREE_VALUE (dup) == decl)
2721 error ("duplicate label declaration `%s'",
2722 IDENTIFIER_POINTER (name));
2723 error_with_decl (TREE_VALUE (dup),
2724 "this is a previous declaration");
2725 /* Just use the previous declaration. */
2726 return lookup_label (name);
2729 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2730 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2733 return lookup_label (name);
2736 /* Define a label, specifying the location in the source file.
2737 Return the LABEL_DECL node for the label, if the definition is valid.
2738 Otherwise return 0. */
2741 define_label (filename, line, name)
2746 tree decl = lookup_label (name);
2748 /* If label with this name is known from an outer context, shadow it. */
2749 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2751 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2752 IDENTIFIER_LABEL_VALUE (name) = 0;
2753 decl = lookup_label (name);
2756 if (DECL_INITIAL (decl) != 0)
2758 error ("duplicate label `%s'", IDENTIFIER_POINTER (name));
2763 /* Mark label as having been defined. */
2764 DECL_INITIAL (decl) = error_mark_node;
2765 /* Say where in the source. */
2766 DECL_SOURCE_FILE (decl) = filename;
2767 DECL_SOURCE_LINE (decl) = line;
2772 /* Return the list of declarations of the current level.
2773 Note that this list is in reverse order unless/until
2774 you nreverse it; and when you do nreverse it, you must
2775 store the result back using `storedecls' or you will lose. */
2780 return current_binding_level->names;
2783 /* Return the list of type-tags (for structs, etc) of the current level. */
2788 return current_binding_level->tags;
2791 /* Store the list of declarations of the current level.
2792 This is done for the parameter declarations of a function being defined,
2793 after they are modified in the light of any missing parameters. */
2799 current_binding_level->names = decls;
2802 /* Similarly, store the list of tags of the current level. */
2808 current_binding_level->tags = tags;
2811 /* Given NAME, an IDENTIFIER_NODE,
2812 return the structure (or union or enum) definition for that name.
2813 Searches binding levels from BINDING_LEVEL up to the global level.
2814 If THISLEVEL_ONLY is nonzero, searches only the specified context
2815 (but skips any tag-transparent contexts to find one that is
2816 meaningful for tags).
2817 CODE says which kind of type the caller wants;
2818 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2819 If the wrong kind of type is found, an error is reported. */
2822 lookup_tag (code, name, binding_level, thislevel_only)
2823 enum tree_code code;
2824 struct binding_level *binding_level;
2828 register struct binding_level *level;
2830 for (level = binding_level; level; level = level->level_chain)
2833 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2835 if (TREE_PURPOSE (tail) == name)
2837 if (TREE_CODE (TREE_VALUE (tail)) != code)
2839 /* Definition isn't the kind we were looking for. */
2840 pending_invalid_xref = name;
2841 pending_invalid_xref_file = input_filename;
2842 pending_invalid_xref_line = lineno;
2844 return TREE_VALUE (tail);
2847 if (thislevel_only && ! level->tag_transparent)
2853 /* Print an error message now
2854 for a recent invalid struct, union or enum cross reference.
2855 We don't print them immediately because they are not invalid
2856 when used in the `struct foo;' construct for shadowing. */
2859 pending_xref_error ()
2861 if (pending_invalid_xref != 0)
2862 error_with_file_and_line (pending_invalid_xref_file,
2863 pending_invalid_xref_line,
2864 "`%s' defined as wrong kind of tag",
2865 IDENTIFIER_POINTER (pending_invalid_xref));
2866 pending_invalid_xref = 0;
2869 /* Given a type, find the tag that was defined for it and return the tag name.
2870 Otherwise return 0. */
2873 lookup_tag_reverse (type)
2876 register struct binding_level *level;
2878 for (level = current_binding_level; level; level = level->level_chain)
2881 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2883 if (TREE_VALUE (tail) == type)
2884 return TREE_PURPOSE (tail);
2890 /* Look up NAME in the current binding level and its superiors
2891 in the namespace of variables, functions and typedefs.
2892 Return a ..._DECL node of some kind representing its definition,
2893 or return 0 if it is undefined. */
2900 if (current_binding_level != global_binding_level
2901 && IDENTIFIER_LOCAL_VALUE (name))
2902 val = IDENTIFIER_LOCAL_VALUE (name);
2904 val = IDENTIFIER_GLOBAL_VALUE (name);
2908 /* Similar to `lookup_name' but look only at current binding level. */
2911 lookup_name_current_level (name)
2916 if (current_binding_level == global_binding_level)
2917 return IDENTIFIER_GLOBAL_VALUE (name);
2919 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2922 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2923 if (DECL_NAME (t) == name)
2929 /* Create the predefined scalar types of C,
2930 and some nodes representing standard constants (0, 1, (void *) 0).
2931 Initialize the global binding level.
2932 Make definitions for built-in primitive functions. */
2935 init_decl_processing ()
2937 register tree endlink;
2938 tree ptr_ftype_void, ptr_ftype_ptr;
2939 int wchar_type_size;
2940 tree array_domain_type;
2942 current_function_decl = NULL;
2943 named_labels = NULL;
2944 current_binding_level = NULL_BINDING_LEVEL;
2945 free_binding_level = NULL_BINDING_LEVEL;
2946 pushlevel (0); /* make the binding_level structure for global names */
2947 global_binding_level = current_binding_level;
2949 /* Define `int' and `char' first so that dbx will output them first. */
2951 integer_type_node = make_signed_type (INT_TYPE_SIZE);
2952 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_INT],
2953 integer_type_node));
2955 /* Define `char', which is like either `signed char' or `unsigned char'
2956 but not the same as either. */
2960 ? make_signed_type (CHAR_TYPE_SIZE)
2961 : make_unsigned_type (CHAR_TYPE_SIZE));
2962 pushdecl (build_decl (TYPE_DECL, get_identifier ("char"),
2965 long_integer_type_node = make_signed_type (LONG_TYPE_SIZE);
2966 pushdecl (build_decl (TYPE_DECL, get_identifier ("long int"),
2967 long_integer_type_node));
2969 unsigned_type_node = make_unsigned_type (INT_TYPE_SIZE);
2970 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned int"),
2971 unsigned_type_node));
2973 long_unsigned_type_node = make_unsigned_type (LONG_TYPE_SIZE);
2974 pushdecl (build_decl (TYPE_DECL, get_identifier ("long unsigned int"),
2975 long_unsigned_type_node));
2977 long_long_integer_type_node = make_signed_type (LONG_LONG_TYPE_SIZE);
2978 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long int"),
2979 long_long_integer_type_node));
2981 long_long_unsigned_type_node = make_unsigned_type (LONG_LONG_TYPE_SIZE);
2982 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long unsigned int"),
2983 long_long_unsigned_type_node));
2985 short_integer_type_node = make_signed_type (SHORT_TYPE_SIZE);
2986 pushdecl (build_decl (TYPE_DECL, get_identifier ("short int"),
2987 short_integer_type_node));
2989 short_unsigned_type_node = make_unsigned_type (SHORT_TYPE_SIZE);
2990 pushdecl (build_decl (TYPE_DECL, get_identifier ("short unsigned int"),
2991 short_unsigned_type_node));
2993 /* `unsigned long' is the standard type for sizeof.
2994 Traditionally, use a signed type.
2995 Note that stddef.h uses `unsigned long',
2996 and this must agree, even if long and int are the same size. */
2998 (TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE))));
2999 if (flag_traditional && TREE_UNSIGNED (sizetype))
3000 set_sizetype (signed_type (sizetype));
3003 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE)));
3005 error_mark_node = make_node (ERROR_MARK);
3006 TREE_TYPE (error_mark_node) = error_mark_node;
3008 /* Define both `signed char' and `unsigned char'. */
3009 signed_char_type_node = make_signed_type (CHAR_TYPE_SIZE);
3010 pushdecl (build_decl (TYPE_DECL, get_identifier ("signed char"),
3011 signed_char_type_node));
3013 unsigned_char_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
3014 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned char"),
3015 unsigned_char_type_node));
3017 /* Create the widest literal types. */
3018 widest_integer_literal_type_node = make_signed_type (HOST_BITS_PER_WIDE_INT * 2);
3019 pushdecl (build_decl (TYPE_DECL, NULL_TREE,
3020 widest_integer_literal_type_node));
3022 widest_unsigned_literal_type_node = make_unsigned_type (HOST_BITS_PER_WIDE_INT * 2);
3023 pushdecl (build_decl (TYPE_DECL, NULL_TREE,
3024 widest_unsigned_literal_type_node));
3026 /* Now all the integer mode types. */
3027 intQI_type_node = make_signed_type (GET_MODE_BITSIZE (QImode));
3028 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intQI_type_node));
3030 intHI_type_node = make_signed_type (GET_MODE_BITSIZE (HImode));
3031 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intHI_type_node));
3033 intSI_type_node = make_signed_type (GET_MODE_BITSIZE (SImode));
3034 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intSI_type_node));
3036 intDI_type_node = make_signed_type (GET_MODE_BITSIZE (DImode));
3037 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
3039 #if HOST_BITS_PER_WIDE_INT >= 64
3040 intTI_type_node = make_signed_type (GET_MODE_BITSIZE (TImode));
3041 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intTI_type_node));
3044 unsigned_intQI_type_node = make_unsigned_type (GET_MODE_BITSIZE (QImode));
3045 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node));
3047 unsigned_intHI_type_node = make_unsigned_type (GET_MODE_BITSIZE (HImode));
3048 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intHI_type_node));
3050 unsigned_intSI_type_node = make_unsigned_type (GET_MODE_BITSIZE (SImode));
3051 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intSI_type_node));
3053 unsigned_intDI_type_node = make_unsigned_type (GET_MODE_BITSIZE (DImode));
3054 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node));
3056 #if HOST_BITS_PER_WIDE_INT >= 64
3057 unsigned_intTI_type_node = make_unsigned_type (GET_MODE_BITSIZE (TImode));
3058 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intTI_type_node));
3061 float_type_node = make_node (REAL_TYPE);
3062 TYPE_PRECISION (float_type_node) = FLOAT_TYPE_SIZE;
3063 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_FLOAT],
3065 layout_type (float_type_node);
3067 double_type_node = make_node (REAL_TYPE);
3068 if (flag_short_double)
3069 TYPE_PRECISION (double_type_node) = FLOAT_TYPE_SIZE;
3071 TYPE_PRECISION (double_type_node) = DOUBLE_TYPE_SIZE;
3072 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_DOUBLE],
3074 layout_type (double_type_node);
3076 long_double_type_node = make_node (REAL_TYPE);
3077 TYPE_PRECISION (long_double_type_node) = LONG_DOUBLE_TYPE_SIZE;
3078 pushdecl (build_decl (TYPE_DECL, get_identifier ("long double"),
3079 long_double_type_node));
3080 layout_type (long_double_type_node);
3082 complex_integer_type_node = make_node (COMPLEX_TYPE);
3083 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex int"),
3084 complex_integer_type_node));
3085 TREE_TYPE (complex_integer_type_node) = integer_type_node;
3086 layout_type (complex_integer_type_node);
3088 complex_float_type_node = make_node (COMPLEX_TYPE);
3089 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex float"),
3090 complex_float_type_node));
3091 TREE_TYPE (complex_float_type_node) = float_type_node;
3092 layout_type (complex_float_type_node);
3094 complex_double_type_node = make_node (COMPLEX_TYPE);
3095 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex double"),
3096 complex_double_type_node));
3097 TREE_TYPE (complex_double_type_node) = double_type_node;
3098 layout_type (complex_double_type_node);
3100 complex_long_double_type_node = make_node (COMPLEX_TYPE);
3101 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex long double"),
3102 complex_long_double_type_node));
3103 TREE_TYPE (complex_long_double_type_node) = long_double_type_node;
3104 layout_type (complex_long_double_type_node);
3107 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (WCHAR_TYPE)));
3108 wchar_type_size = TYPE_PRECISION (wchar_type_node);
3109 signed_wchar_type_node = signed_type (wchar_type_node);
3110 unsigned_wchar_type_node = unsigned_type (wchar_type_node);
3112 integer_zero_node = build_int_2 (0, 0);
3113 TREE_TYPE (integer_zero_node) = integer_type_node;
3114 integer_one_node = build_int_2 (1, 0);
3115 TREE_TYPE (integer_one_node) = integer_type_node;
3117 boolean_type_node = integer_type_node;
3118 boolean_true_node = integer_one_node;
3119 boolean_false_node = integer_zero_node;
3121 size_zero_node = build_int_2 (0, 0);
3122 TREE_TYPE (size_zero_node) = sizetype;
3123 size_one_node = build_int_2 (1, 0);
3124 TREE_TYPE (size_one_node) = sizetype;
3126 void_type_node = make_node (VOID_TYPE);
3127 pushdecl (build_decl (TYPE_DECL,
3128 ridpointers[(int) RID_VOID], void_type_node));
3129 layout_type (void_type_node); /* Uses integer_zero_node */
3130 /* We are not going to have real types in C with less than byte alignment,
3131 so we might as well not have any types that claim to have it. */
3132 TYPE_ALIGN (void_type_node) = BITS_PER_UNIT;
3134 null_pointer_node = build_int_2 (0, 0);
3135 TREE_TYPE (null_pointer_node) = build_pointer_type (void_type_node);
3136 layout_type (TREE_TYPE (null_pointer_node));
3138 string_type_node = build_pointer_type (char_type_node);
3139 const_string_type_node
3140 = build_pointer_type (build_type_variant (char_type_node, 1, 0));
3142 /* Make a type to be the domain of a few array types
3143 whose domains don't really matter.
3144 200 is small enough that it always fits in size_t
3145 and large enough that it can hold most function names for the
3146 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
3147 array_domain_type = build_index_type (build_int_2 (200, 0));
3149 /* make a type for arrays of characters.
3150 With luck nothing will ever really depend on the length of this
3152 char_array_type_node
3153 = build_array_type (char_type_node, array_domain_type);
3154 /* Likewise for arrays of ints. */
3156 = build_array_type (integer_type_node, array_domain_type);
3157 /* This is for wide string constants. */
3158 wchar_array_type_node
3159 = build_array_type (wchar_type_node, array_domain_type);
3161 void_list_node = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
3163 default_function_type
3164 = build_function_type (integer_type_node, NULL_TREE);
3166 ptr_type_node = build_pointer_type (void_type_node);
3168 = build_pointer_type (build_type_variant (void_type_node, 1, 0));
3170 c_common_nodes_and_builtins (0, flag_no_builtin, flag_no_nonansi_builtin);
3172 endlink = void_list_node;
3173 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
3175 = build_function_type (ptr_type_node,
3176 tree_cons (NULL_TREE, ptr_type_node, endlink));
3178 builtin_function ("__builtin_aggregate_incoming_address",
3179 build_function_type (ptr_type_node, NULL_TREE),
3180 BUILT_IN_AGGREGATE_INCOMING_ADDRESS, NULL_PTR);
3182 /* Hooks for the DWARF 2 __throw routine. */
3183 builtin_function ("__builtin_unwind_init",
3184 build_function_type (void_type_node, endlink),
3185 BUILT_IN_UNWIND_INIT, NULL_PTR);
3186 builtin_function ("__builtin_dwarf_cfa", ptr_ftype_void,
3187 BUILT_IN_DWARF_CFA, NULL_PTR);
3188 builtin_function ("__builtin_dwarf_fp_regnum",
3189 build_function_type (unsigned_type_node, endlink),
3190 BUILT_IN_DWARF_FP_REGNUM, NULL_PTR);
3191 builtin_function ("__builtin_dwarf_reg_size", int_ftype_int,
3192 BUILT_IN_DWARF_REG_SIZE, NULL_PTR);
3193 builtin_function ("__builtin_frob_return_addr", ptr_ftype_ptr,
3194 BUILT_IN_FROB_RETURN_ADDR, NULL_PTR);
3195 builtin_function ("__builtin_extract_return_addr", ptr_ftype_ptr,
3196 BUILT_IN_EXTRACT_RETURN_ADDR, NULL_PTR);
3198 ("__builtin_eh_return",
3199 build_function_type (void_type_node,
3200 tree_cons (NULL_TREE, ptr_type_node,
3201 tree_cons (NULL_TREE,
3202 type_for_mode (ptr_mode, 0),
3203 tree_cons (NULL_TREE,
3206 BUILT_IN_EH_RETURN, NULL_PTR);
3208 pedantic_lvalues = pedantic;
3210 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
3211 declare_function_name ();
3213 start_identifier_warnings ();
3215 /* Prepare to check format strings against argument lists. */
3216 init_function_format_info ();
3220 incomplete_decl_finalize_hook = finish_incomplete_decl;
3222 lang_get_alias_set = c_get_alias_set;
3225 /* Return a definition for a builtin function named NAME and whose data type
3226 is TYPE. TYPE should be a function type with argument types.
3227 FUNCTION_CODE tells later passes how to compile calls to this function.
3228 See tree.h for its possible values.
3230 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3231 the name to be called if we can't opencode the function. */
3234 builtin_function (name, type, function_code, library_name)
3237 enum built_in_function function_code;
3238 const char *library_name;
3240 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3241 DECL_EXTERNAL (decl) = 1;
3242 TREE_PUBLIC (decl) = 1;
3243 /* If -traditional, permit redefining a builtin function any way you like.
3244 (Though really, if the program redefines these functions,
3245 it probably won't work right unless compiled with -fno-builtin.) */
3246 if (flag_traditional && name[0] != '_')
3247 DECL_BUILT_IN_NONANSI (decl) = 1;
3249 DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
3250 make_decl_rtl (decl, NULL_PTR, 1);
3252 if (function_code != NOT_BUILT_IN)
3254 DECL_BUILT_IN (decl) = 1;
3255 DECL_FUNCTION_CODE (decl) = function_code;
3257 /* Warn if a function in the namespace for users
3258 is used without an occasion to consider it declared. */
3259 if (name[0] != '_' || name[1] != '_')
3260 C_DECL_ANTICIPATED (decl) = 1;
3265 /* Called when a declaration is seen that contains no names to declare.
3266 If its type is a reference to a structure, union or enum inherited
3267 from a containing scope, shadow that tag name for the current scope
3268 with a forward reference.
3269 If its type defines a new named structure or union
3270 or defines an enum, it is valid but we need not do anything here.
3271 Otherwise, it is an error. */
3274 shadow_tag (declspecs)
3277 shadow_tag_warned (declspecs, 0);
3281 shadow_tag_warned (declspecs, warned)
3284 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3291 pending_invalid_xref = 0;
3293 /* Remove the attributes from declspecs, since they will confuse the
3295 split_specs_attrs (declspecs, &specs, &attrs);
3297 for (link = specs; link; link = TREE_CHAIN (link))
3299 register tree value = TREE_VALUE (link);
3300 register enum tree_code code = TREE_CODE (value);
3302 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3303 /* Used to test also that TYPE_SIZE (value) != 0.
3304 That caused warning for `struct foo;' at top level in the file. */
3306 register tree name = lookup_tag_reverse (value);
3313 if (warned != 1 && code != ENUMERAL_TYPE)
3314 /* Empty unnamed enum OK */
3316 pedwarn ("unnamed struct/union that defines no instances");
3322 t = lookup_tag (code, name, current_binding_level, 1);
3326 t = make_node (code);
3333 if (!warned && ! in_system_header)
3335 warning ("useless keyword or type name in empty declaration");
3342 error ("two types specified in one empty declaration");
3347 pedwarn ("empty declaration");
3351 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3354 groktypename (typename)
3357 if (TREE_CODE (typename) != TREE_LIST)
3359 return grokdeclarator (TREE_VALUE (typename),
3360 TREE_PURPOSE (typename),
3364 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3367 groktypename_in_parm_context (typename)
3370 if (TREE_CODE (typename) != TREE_LIST)
3372 return grokdeclarator (TREE_VALUE (typename),
3373 TREE_PURPOSE (typename),
3377 /* Decode a declarator in an ordinary declaration or data definition.
3378 This is called as soon as the type information and variable name
3379 have been parsed, before parsing the initializer if any.
3380 Here we create the ..._DECL node, fill in its type,
3381 and put it on the list of decls for the current context.
3382 The ..._DECL node is returned as the value.
3384 Exception: for arrays where the length is not specified,
3385 the type is left null, to be filled in by `finish_decl'.
3387 Function definitions do not come here; they go to start_function
3388 instead. However, external and forward declarations of functions
3389 do go through here. Structure field declarations are done by
3390 grokfield and not through here. */
3392 /* Set this to zero to debug not using the temporary obstack
3393 to parse initializers. */
3394 int debug_temp_inits = 1;
3397 start_decl (declarator, declspecs, initialized, attributes, prefix_attributes)
3398 tree declarator, declspecs;
3400 tree attributes, prefix_attributes;
3402 register tree decl = grokdeclarator (declarator, declspecs,
3403 NORMAL, initialized);
3405 int init_written = initialized;
3407 /* The corresponding pop_obstacks is in finish_decl. */
3408 push_obstacks_nochange ();
3410 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3411 && !strcmp (IDENTIFIER_POINTER (DECL_NAME (decl)), "main"))
3412 warning_with_decl (decl, "`%s' is usually a function");
3415 /* Is it valid for this decl to have an initializer at all?
3416 If not, set INITIALIZED to zero, which will indirectly
3417 tell `finish_decl' to ignore the initializer once it is parsed. */
3418 switch (TREE_CODE (decl))
3421 /* typedef foo = bar means give foo the same type as bar.
3422 We haven't parsed bar yet, so `finish_decl' will fix that up.
3423 Any other case of an initialization in a TYPE_DECL is an error. */
3424 if (pedantic || list_length (declspecs) > 1)
3426 error ("typedef `%s' is initialized",
3427 IDENTIFIER_POINTER (DECL_NAME (decl)));
3433 error ("function `%s' is initialized like a variable",
3434 IDENTIFIER_POINTER (DECL_NAME (decl)));
3439 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3440 error ("parameter `%s' is initialized",
3441 IDENTIFIER_POINTER (DECL_NAME (decl)));
3446 /* Don't allow initializations for incomplete types
3447 except for arrays which might be completed by the initialization. */
3448 if (TYPE_SIZE (TREE_TYPE (decl)) != 0)
3450 /* A complete type is ok if size is fixed. */
3452 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3453 || C_DECL_VARIABLE_SIZE (decl))
3455 error ("variable-sized object may not be initialized");
3459 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3461 error ("variable `%s' has initializer but incomplete type",
3462 IDENTIFIER_POINTER (DECL_NAME (decl)));
3465 else if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl))) == 0)
3467 error ("elements of array `%s' have incomplete type",
3468 IDENTIFIER_POINTER (DECL_NAME (decl)));
3475 #if 0 /* Seems redundant with grokdeclarator. */
3476 if (current_binding_level != global_binding_level
3477 && DECL_EXTERNAL (decl)
3478 && TREE_CODE (decl) != FUNCTION_DECL)
3479 warning ("declaration of `%s' has `extern' and is initialized",
3480 IDENTIFIER_POINTER (DECL_NAME (decl)));
3482 DECL_EXTERNAL (decl) = 0;
3483 if (current_binding_level == global_binding_level)
3484 TREE_STATIC (decl) = 1;
3486 /* Tell `pushdecl' this is an initialized decl
3487 even though we don't yet have the initializer expression.
3488 Also tell `finish_decl' it may store the real initializer. */
3489 DECL_INITIAL (decl) = error_mark_node;
3492 /* If this is a function declaration, write a record describing it to the
3493 prototypes file (if requested). */
3495 if (TREE_CODE (decl) == FUNCTION_DECL)
3496 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3498 /* ANSI specifies that a tentative definition which is not merged with
3499 a non-tentative definition behaves exactly like a definition with an
3500 initializer equal to zero. (Section 3.7.2)
3501 -fno-common gives strict ANSI behavior. Usually you don't want it.
3502 This matters only for variables with external linkage. */
3503 if (! flag_no_common || ! TREE_PUBLIC (decl))
3504 DECL_COMMON (decl) = 1;
3506 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
3507 SET_DEFAULT_DECL_ATTRIBUTES (decl, attributes);
3510 /* Set attributes here so if duplicate decl, will have proper attributes. */
3511 decl_attributes (decl, attributes, prefix_attributes);
3513 /* Add this decl to the current binding level.
3514 TEM may equal DECL or it may be a previous decl of the same name. */
3515 tem = pushdecl (decl);
3517 /* For a local variable, define the RTL now. */
3518 if (current_binding_level != global_binding_level
3519 /* But not if this is a duplicate decl
3520 and we preserved the rtl from the previous one
3521 (which may or may not happen). */
3522 && DECL_RTL (tem) == 0)
3524 if (TYPE_SIZE (TREE_TYPE (tem)) != 0)
3526 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3527 && DECL_INITIAL (tem) != 0)
3533 /* When parsing and digesting the initializer,
3534 use temporary storage. Do this even if we will ignore the value. */
3535 if (current_binding_level == global_binding_level && debug_temp_inits)
3536 temporary_allocation ();
3542 /* Finish processing of a declaration;
3543 install its initial value.
3544 If the length of an array type is not known before,
3545 it must be determined now, from the initial value, or it is an error. */
3548 finish_decl (decl, init, asmspec_tree)
3552 register tree type = TREE_TYPE (decl);
3553 int was_incomplete = (DECL_SIZE (decl) == 0);
3554 int temporary = allocation_temporary_p ();
3557 /* If a name was specified, get the string. */
3559 asmspec = TREE_STRING_POINTER (asmspec_tree);
3561 /* If `start_decl' didn't like having an initialization, ignore it now. */
3563 if (init != 0 && DECL_INITIAL (decl) == 0)
3565 /* Don't crash if parm is initialized. */
3566 if (TREE_CODE (decl) == PARM_DECL)
3569 if (ITERATOR_P (decl))
3572 error_with_decl (decl, "iterator has no initial value");
3574 init = save_expr (init);
3579 if (TREE_CODE (decl) != TYPE_DECL)
3580 store_init_value (decl, init);
3583 /* typedef foo = bar; store the type of bar as the type of foo. */
3584 TREE_TYPE (decl) = TREE_TYPE (init);
3585 DECL_INITIAL (decl) = init = 0;
3589 /* Pop back to the obstack that is current for this binding level.
3590 This is because MAXINDEX, rtl, etc. to be made below
3591 must go in the permanent obstack. But don't discard the
3592 temporary data yet. */
3594 #if 0 /* pop_obstacks was near the end; this is what was here. */
3595 if (current_binding_level == global_binding_level && temporary)
3596 end_temporary_allocation ();
3599 /* Deduce size of array from initialization, if not already known */
3601 if (TREE_CODE (type) == ARRAY_TYPE
3602 && TYPE_DOMAIN (type) == 0
3603 && TREE_CODE (decl) != TYPE_DECL)
3606 = (TREE_STATIC (decl)
3607 /* Even if pedantic, an external linkage array
3608 may have incomplete type at first. */
3609 ? pedantic && !TREE_PUBLIC (decl)
3610 : !DECL_EXTERNAL (decl));
3612 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3614 /* Get the completed type made by complete_array_type. */
3615 type = TREE_TYPE (decl);
3618 error_with_decl (decl, "initializer fails to determine size of `%s'");
3623 error_with_decl (decl, "array size missing in `%s'");
3624 /* If a `static' var's size isn't known,
3625 make it extern as well as static, so it does not get
3627 If it is not `static', then do not mark extern;
3628 finish_incomplete_decl will give it a default size
3629 and it will get allocated. */
3630 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3631 DECL_EXTERNAL (decl) = 1;
3634 /* TYPE_MAX_VALUE is always one less than the number of elements
3635 in the array, because we start counting at zero. Therefore,
3636 warn only if the value is less than zero. */
3637 if (pedantic && TYPE_DOMAIN (type) != 0
3638 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3639 error_with_decl (decl, "zero or negative size array `%s'");
3641 layout_decl (decl, 0);
3644 if (TREE_CODE (decl) == VAR_DECL)
3646 if (DECL_SIZE (decl) == 0
3647 && TYPE_SIZE (TREE_TYPE (decl)) != 0)
3648 layout_decl (decl, 0);
3650 if (DECL_SIZE (decl) == 0
3651 && (TREE_STATIC (decl)
3653 /* A static variable with an incomplete type
3654 is an error if it is initialized.
3655 Also if it is not file scope.
3656 Otherwise, let it through, but if it is not `extern'
3657 then it may cause an error message later. */
3658 /* A duplicate_decls call could have changed an extern
3659 declaration into a file scope one. This can be detected
3660 by TREE_ASM_WRITTEN being set. */
3661 (DECL_INITIAL (decl) != 0
3662 || (DECL_CONTEXT (decl) != 0 && ! TREE_ASM_WRITTEN (decl)))
3664 /* An automatic variable with an incomplete type
3666 !DECL_EXTERNAL (decl)))
3668 error_with_decl (decl, "storage size of `%s' isn't known");
3669 TREE_TYPE (decl) = error_mark_node;
3672 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3673 && DECL_SIZE (decl) != 0)
3675 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3676 constant_expression_warning (DECL_SIZE (decl));
3678 error_with_decl (decl, "storage size of `%s' isn't constant");
3681 if (TREE_USED (type))
3682 TREE_USED (decl) = 1;
3685 /* If this is a function and an assembler name is specified, it isn't
3686 builtin any more. Also reset DECL_RTL so we can give it its new
3688 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3690 DECL_BUILT_IN (decl) = 0;
3691 DECL_RTL (decl) = 0;
3694 /* Output the assembler code and/or RTL code for variables and functions,
3695 unless the type is an undefined structure or union.
3696 If not, it will get done when the type is completed. */
3698 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3700 if ((flag_traditional || TREE_PERMANENT (decl))
3701 && allocation_temporary_p ())
3703 push_obstacks_nochange ();
3704 end_temporary_allocation ();
3705 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3706 maybe_objc_check_decl (decl);
3707 rest_of_decl_compilation (decl, asmspec,
3708 (DECL_CONTEXT (decl) == 0
3709 || TREE_ASM_WRITTEN (decl)),
3715 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3716 maybe_objc_check_decl (decl);
3717 rest_of_decl_compilation (decl, asmspec, DECL_CONTEXT (decl) == 0,
3720 if (DECL_CONTEXT (decl) != 0)
3722 /* Recompute the RTL of a local array now
3723 if it used to be an incomplete type. */
3725 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3727 /* If we used it already as memory, it must stay in memory. */
3728 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3729 /* If it's still incomplete now, no init will save it. */
3730 if (DECL_SIZE (decl) == 0)
3731 DECL_INITIAL (decl) = 0;
3734 /* Compute and store the initial value. */
3735 if (TREE_CODE (decl) != FUNCTION_DECL)
3736 expand_decl_init (decl);
3740 if (TREE_CODE (decl) == TYPE_DECL)
3742 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3743 maybe_objc_check_decl (decl);
3744 rest_of_decl_compilation (decl, NULL_PTR, DECL_CONTEXT (decl) == 0,
3748 /* ??? After 2.3, test (init != 0) instead of TREE_CODE. */
3749 /* This test used to include TREE_PERMANENT, however, we have the same
3750 problem with initializers at the function level. Such initializers get
3751 saved until the end of the function on the momentary_obstack. */
3752 if (!(TREE_CODE (decl) == FUNCTION_DECL && DECL_INLINE (decl))
3754 /* DECL_INITIAL is not defined in PARM_DECLs, since it shares
3755 space with DECL_ARG_TYPE. */
3756 && TREE_CODE (decl) != PARM_DECL)
3758 /* We need to remember that this array HAD an initialization,
3759 but discard the actual temporary nodes,
3760 since we can't have a permanent node keep pointing to them. */
3761 /* We make an exception for inline functions, since it's
3762 normal for a local extern redeclaration of an inline function
3763 to have a copy of the top-level decl's DECL_INLINE. */
3764 if (DECL_INITIAL (decl) != 0 && DECL_INITIAL (decl) != error_mark_node)
3766 /* If this is a const variable, then preserve the
3767 initializer instead of discarding it so that we can optimize
3768 references to it. */
3769 /* This test used to include TREE_STATIC, but this won't be set
3770 for function level initializers. */
3771 if (TREE_READONLY (decl) || ITERATOR_P (decl))
3773 preserve_initializer ();
3774 /* Hack? Set the permanent bit for something that is permanent,
3775 but not on the permanent obstack, so as to convince
3776 output_constant_def to make its rtl on the permanent
3778 TREE_PERMANENT (DECL_INITIAL (decl)) = 1;
3780 /* The initializer and DECL must have the same (or equivalent
3781 types), but if the initializer is a STRING_CST, its type
3782 might not be on the right obstack, so copy the type
3784 TREE_TYPE (DECL_INITIAL (decl)) = type;
3787 DECL_INITIAL (decl) = error_mark_node;
3791 /* If requested, warn about definitions of large data objects. */
3793 if (warn_larger_than
3794 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL)
3795 && !DECL_EXTERNAL (decl))
3797 register tree decl_size = DECL_SIZE (decl);
3799 if (decl_size && TREE_CODE (decl_size) == INTEGER_CST)
3801 unsigned units = TREE_INT_CST_LOW(decl_size) / BITS_PER_UNIT;
3803 if (units > larger_than_size)
3804 warning_with_decl (decl, "size of `%s' is %u bytes", units);
3809 /* Resume permanent allocation, if not within a function. */
3810 /* The corresponding push_obstacks_nochange is in start_decl,
3811 and in push_parm_decl and in grokfield. */
3815 /* If we have gone back from temporary to permanent allocation,
3816 actually free the temporary space that we no longer need. */
3817 if (temporary && !allocation_temporary_p ())
3818 permanent_allocation (0);
3820 /* At the end of a declaration, throw away any variable type sizes
3821 of types defined inside that declaration. There is no use
3822 computing them in the following function definition. */
3823 if (current_binding_level == global_binding_level)
3824 get_pending_sizes ();
3827 /* If DECL has a cleanup, build and return that cleanup here.
3828 This is a callback called by expand_expr. */
3831 maybe_build_cleanup (decl)
3832 tree decl ATTRIBUTE_UNUSED;
3834 /* There are no cleanups in C. */
3838 /* Given a parsed parameter declaration,
3839 decode it into a PARM_DECL and push that on the current binding level.
3840 Also, for the sake of forward parm decls,
3841 record the given order of parms in `parm_order'. */
3844 push_parm_decl (parm)
3848 int old_immediate_size_expand = immediate_size_expand;
3849 /* Don't try computing parm sizes now -- wait till fn is called. */
3850 immediate_size_expand = 0;
3852 /* The corresponding pop_obstacks is in finish_decl. */
3853 push_obstacks_nochange ();
3855 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3856 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3857 decl_attributes (decl, TREE_VALUE (TREE_VALUE (parm)),
3858 TREE_PURPOSE (TREE_VALUE (parm)));
3861 if (DECL_NAME (decl))
3864 olddecl = lookup_name (DECL_NAME (decl));
3865 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3866 pedwarn_with_decl (decl, "ANSI C forbids parameter `%s' shadowing typedef");
3870 decl = pushdecl (decl);
3872 immediate_size_expand = old_immediate_size_expand;
3874 current_binding_level->parm_order
3875 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3877 /* Add this decl to the current binding level. */
3878 finish_decl (decl, NULL_TREE, NULL_TREE);
3881 /* Clear the given order of parms in `parm_order'.
3882 Used at start of parm list,
3883 and also at semicolon terminating forward decls. */
3888 current_binding_level->parm_order = NULL_TREE;
3891 /* Make TYPE a complete type based on INITIAL_VALUE.
3892 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3893 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3896 complete_array_type (type, initial_value, do_default)
3901 register tree maxindex = NULL_TREE;
3906 /* Note MAXINDEX is really the maximum index,
3907 one less than the size. */
3908 if (TREE_CODE (initial_value) == STRING_CST)
3911 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3912 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3915 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3917 tree elts = CONSTRUCTOR_ELTS (initial_value);
3918 maxindex = size_binop (MINUS_EXPR, integer_zero_node, size_one_node);
3919 for (; elts; elts = TREE_CHAIN (elts))
3921 if (TREE_PURPOSE (elts))
3922 maxindex = TREE_PURPOSE (elts);
3924 maxindex = size_binop (PLUS_EXPR, maxindex, size_one_node);
3926 maxindex = copy_node (maxindex);
3930 /* Make an error message unless that happened already. */
3931 if (initial_value != error_mark_node)
3934 /* Prevent further error messages. */
3935 maxindex = build_int_2 (0, 0);
3942 maxindex = build_int_2 (0, 0);
3948 TYPE_DOMAIN (type) = build_index_type (maxindex);
3949 if (!TREE_TYPE (maxindex))
3950 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3953 /* Lay out the type now that we can get the real answer. */
3960 /* Given declspecs and a declarator,
3961 determine the name and type of the object declared
3962 and construct a ..._DECL node for it.
3963 (In one case we can return a ..._TYPE node instead.
3964 For invalid input we sometimes return 0.)
3966 DECLSPECS is a chain of tree_list nodes whose value fields
3967 are the storage classes and type specifiers.
3969 DECL_CONTEXT says which syntactic context this declaration is in:
3970 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3971 FUNCDEF for a function definition. Like NORMAL but a few different
3972 error messages in each case. Return value may be zero meaning
3973 this definition is too screwy to try to parse.
3974 PARM for a parameter declaration (either within a function prototype
3975 or before a function body). Make a PARM_DECL, or return void_type_node.
3976 TYPENAME if for a typename (in a cast or sizeof).
3977 Don't make a DECL node; just return the ..._TYPE node.
3978 FIELD for a struct or union field; make a FIELD_DECL.
3979 BITFIELD for a field with specified width.
3980 INITIALIZED is 1 if the decl has an initializer.
3982 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3983 It may also be so in the PARM case, for a prototype where the
3984 argument type is specified but not the name.
3986 This function is where the complicated C meanings of `static'
3987 and `extern' are interpreted. */
3990 grokdeclarator (declarator, declspecs, decl_context, initialized)
3993 enum decl_context decl_context;
3998 tree type = NULL_TREE;
4003 int type_quals = TYPE_UNQUALIFIED;
4005 int explicit_int = 0;
4006 int explicit_char = 0;
4007 int defaulted_int = 0;
4008 tree typedef_decl = 0;
4010 tree typedef_type = 0;
4011 int funcdef_flag = 0;
4012 enum tree_code innermost_code = ERROR_MARK;
4014 int size_varies = 0;
4015 tree decl_machine_attr = NULL_TREE;
4017 if (decl_context == BITFIELD)
4018 bitfield = 1, decl_context = FIELD;
4020 if (decl_context == FUNCDEF)
4021 funcdef_flag = 1, decl_context = NORMAL;
4023 push_obstacks_nochange ();
4025 if (flag_traditional && allocation_temporary_p ())
4026 end_temporary_allocation ();
4028 /* Look inside a declarator for the name being declared
4029 and get it as a string, for an error message. */
4031 register tree decl = declarator;
4035 switch (TREE_CODE (decl))
4040 innermost_code = TREE_CODE (decl);
4041 decl = TREE_OPERAND (decl, 0);
4044 case IDENTIFIER_NODE:
4045 name = IDENTIFIER_POINTER (decl);
4056 /* A function definition's declarator must have the form of
4057 a function declarator. */
4059 if (funcdef_flag && innermost_code != CALL_EXPR)
4062 /* Anything declared one level down from the top level
4063 must be one of the parameters of a function
4064 (because the body is at least two levels down). */
4066 /* If this looks like a function definition, make it one,
4067 even if it occurs where parms are expected.
4068 Then store_parm_decls will reject it and not use it as a parm. */
4069 if (decl_context == NORMAL && !funcdef_flag
4070 && current_binding_level->parm_flag)
4071 decl_context = PARM;
4073 /* Look through the decl specs and record which ones appear.
4074 Some typespecs are defined as built-in typenames.
4075 Others, the ones that are modifiers of other types,
4076 are represented by bits in SPECBITS: set the bits for
4077 the modifiers that appear. Storage class keywords are also in SPECBITS.
4079 If there is a typedef name or a type, store the type in TYPE.
4080 This includes builtin typedefs such as `int'.
4082 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
4083 and did not come from a user typedef.
4085 Set LONGLONG if `long' is mentioned twice. */
4087 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
4090 register tree id = TREE_VALUE (spec);
4092 if (id == ridpointers[(int) RID_INT])
4094 if (id == ridpointers[(int) RID_CHAR])
4097 if (TREE_CODE (id) == IDENTIFIER_NODE)
4098 for (i = (int) RID_FIRST_MODIFIER; i < (int) RID_MAX; i++)
4100 if (ridpointers[i] == id)
4102 if (i == (int) RID_LONG && specbits & (1<<i))
4105 error ("`long long long' is too long for GCC");
4108 if (pedantic && ! in_system_header && warn_long_long)
4109 pedwarn ("ANSI C does not support `long long'");
4113 else if (specbits & (1 << i))
4114 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
4120 error ("two or more data types in declaration of `%s'", name);
4121 /* Actual typedefs come to us as TYPE_DECL nodes. */
4122 else if (TREE_CODE (id) == TYPE_DECL)
4124 type = TREE_TYPE (id);
4125 decl_machine_attr = DECL_MACHINE_ATTRIBUTES (id);
4128 /* Built-in types come as identifiers. */
4129 else if (TREE_CODE (id) == IDENTIFIER_NODE)
4131 register tree t = lookup_name (id);
4132 if (TREE_TYPE (t) == error_mark_node)
4134 else if (!t || TREE_CODE (t) != TYPE_DECL)
4135 error ("`%s' fails to be a typedef or built in type",
4136 IDENTIFIER_POINTER (id));
4139 type = TREE_TYPE (t);
4143 else if (TREE_CODE (id) != ERROR_MARK)
4149 typedef_type = type;
4151 size_varies = C_TYPE_VARIABLE_SIZE (type);
4153 /* No type at all: default to `int', and set DEFAULTED_INT
4154 because it was not a user-defined typedef. */
4158 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4159 | (1 << (int) RID_SIGNED)
4160 | (1 << (int) RID_UNSIGNED))))
4161 /* Don't warn about typedef foo = bar. */
4162 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
4163 && ! (in_system_header && ! allocation_temporary_p ()))
4165 /* Issue a warning if this is an ISO C 9x program or if -Wreturn-type
4166 and this is a function, or if -Wimplicit; prefer the former
4167 warning since it is more explicit. */
4168 if ((warn_implicit_int || warn_return_type) && funcdef_flag)
4169 warn_about_return_type = 1;
4170 else if (warn_implicit_int || flag_isoc9x)
4171 warning ("type defaults to `int' in declaration of `%s'", name);
4175 type = integer_type_node;
4178 /* Now process the modifiers that were specified
4179 and check for invalid combinations. */
4181 /* Long double is a special combination. */
4183 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4184 && TYPE_MAIN_VARIANT (type) == double_type_node)
4186 specbits &= ~ (1 << (int) RID_LONG);
4187 type = long_double_type_node;
4190 /* Check all other uses of type modifiers. */
4192 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4193 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4197 if ((specbits & 1 << (int) RID_LONG)
4198 && (specbits & 1 << (int) RID_SHORT))
4199 error ("both long and short specified for `%s'", name);
4200 else if (((specbits & 1 << (int) RID_LONG)
4201 || (specbits & 1 << (int) RID_SHORT))
4203 error ("long or short specified with char for `%s'", name);
4204 else if (((specbits & 1 << (int) RID_LONG)
4205 || (specbits & 1 << (int) RID_SHORT))
4206 && TREE_CODE (type) == REAL_TYPE)
4208 static int already = 0;
4210 error ("long or short specified with floating type for `%s'", name);
4211 if (! already && ! pedantic)
4213 error ("the only valid combination is `long double'");
4217 else if ((specbits & 1 << (int) RID_SIGNED)
4218 && (specbits & 1 << (int) RID_UNSIGNED))
4219 error ("both signed and unsigned specified for `%s'", name);
4220 else if (TREE_CODE (type) != INTEGER_TYPE)
4221 error ("long, short, signed or unsigned invalid for `%s'", name);
4225 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4227 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4229 if (flag_pedantic_errors)
4234 /* Discard the type modifiers if they are invalid. */
4237 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4238 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4243 if ((specbits & (1 << (int) RID_COMPLEX))
4244 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4246 error ("complex invalid for `%s'", name);
4247 specbits &= ~ (1 << (int) RID_COMPLEX);
4250 /* Decide whether an integer type is signed or not.
4251 Optionally treat bitfields as signed by default. */
4252 if (specbits & 1 << (int) RID_UNSIGNED
4253 /* Traditionally, all bitfields are unsigned. */
4254 || (bitfield && flag_traditional
4255 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4256 || (bitfield && ! flag_signed_bitfields
4257 && (explicit_int || defaulted_int || explicit_char
4258 /* A typedef for plain `int' without `signed'
4259 can be controlled just like plain `int'. */
4260 || ! (typedef_decl != 0
4261 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4262 && TREE_CODE (type) != ENUMERAL_TYPE
4263 && !(specbits & 1 << (int) RID_SIGNED)))
4266 type = long_long_unsigned_type_node;
4267 else if (specbits & 1 << (int) RID_LONG)
4268 type = long_unsigned_type_node;
4269 else if (specbits & 1 << (int) RID_SHORT)
4270 type = short_unsigned_type_node;
4271 else if (type == char_type_node)
4272 type = unsigned_char_type_node;
4273 else if (typedef_decl)
4274 type = unsigned_type (type);
4276 type = unsigned_type_node;
4278 else if ((specbits & 1 << (int) RID_SIGNED)
4279 && type == char_type_node)
4280 type = signed_char_type_node;
4282 type = long_long_integer_type_node;
4283 else if (specbits & 1 << (int) RID_LONG)
4284 type = long_integer_type_node;
4285 else if (specbits & 1 << (int) RID_SHORT)
4286 type = short_integer_type_node;
4288 if (specbits & 1 << (int) RID_COMPLEX)
4290 /* If we just have "complex", it is equivalent to
4291 "complex double", but if any modifiers at all are specified it is
4292 the complex form of TYPE. E.g, "complex short" is
4293 "complex short int". */
4295 if (defaulted_int && ! longlong
4296 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4297 | (1 << (int) RID_SIGNED)
4298 | (1 << (int) RID_UNSIGNED))))
4299 type = complex_double_type_node;
4300 else if (type == integer_type_node)
4301 type = complex_integer_type_node;
4302 else if (type == float_type_node)
4303 type = complex_float_type_node;
4304 else if (type == double_type_node)
4305 type = complex_double_type_node;
4306 else if (type == long_double_type_node)
4307 type = complex_long_double_type_node;
4309 type = build_complex_type (type);
4312 /* Figure out the type qualifiers for the declaration. There are
4313 two ways a declaration can become qualified. One is something
4314 like `const int i' where the `const' is explicit. Another is
4315 something like `typedef const int CI; CI i' where the type of the
4316 declaration contains the `const'. */
4317 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4318 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
4319 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4320 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4322 pedwarn ("duplicate `const'");
4324 pedwarn ("duplicate `restrict'");
4326 pedwarn ("duplicate `volatile'");
4327 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
4328 type = TYPE_MAIN_VARIANT (type);
4329 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4330 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4331 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4333 /* Warn if two storage classes are given. Default to `auto'. */
4338 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4339 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4340 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4341 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4342 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4343 if (specbits & 1 << (int) RID_ITERATOR) nclasses++;
4345 /* Warn about storage classes that are invalid for certain
4346 kinds of declarations (parameters, typenames, etc.). */
4349 error ("multiple storage classes in declaration of `%s'", name);
4350 else if (funcdef_flag
4352 & ((1 << (int) RID_REGISTER)
4353 | (1 << (int) RID_AUTO)
4354 | (1 << (int) RID_TYPEDEF))))
4356 if (specbits & 1 << (int) RID_AUTO
4357 && (pedantic || current_binding_level == global_binding_level))
4358 pedwarn ("function definition declared `auto'");
4359 if (specbits & 1 << (int) RID_REGISTER)
4360 error ("function definition declared `register'");
4361 if (specbits & 1 << (int) RID_TYPEDEF)
4362 error ("function definition declared `typedef'");
4363 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4364 | (1 << (int) RID_AUTO));
4366 else if (decl_context != NORMAL && nclasses > 0)
4368 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4372 error ((decl_context == FIELD
4373 ? "storage class specified for structure field `%s'"
4374 : (decl_context == PARM
4375 ? "storage class specified for parameter `%s'"
4376 : "storage class specified for typename")),
4378 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4379 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4380 | (1 << (int) RID_EXTERN));
4383 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4385 /* `extern' with initialization is invalid if not at top level. */
4386 if (current_binding_level == global_binding_level)
4387 warning ("`%s' initialized and declared `extern'", name);
4389 error ("`%s' has both `extern' and initializer", name);
4391 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4392 && current_binding_level != global_binding_level)
4393 error ("nested function `%s' declared `extern'", name);
4394 else if (current_binding_level == global_binding_level
4395 && specbits & (1 << (int) RID_AUTO))
4396 error ("top-level declaration of `%s' specifies `auto'", name);
4397 else if ((specbits & 1 << (int) RID_ITERATOR)
4398 && TREE_CODE (declarator) != IDENTIFIER_NODE)
4400 error ("iterator `%s' has derived type", name);
4401 type = error_mark_node;
4403 else if ((specbits & 1 << (int) RID_ITERATOR)
4404 && TREE_CODE (type) != INTEGER_TYPE)
4406 error ("iterator `%s' has noninteger type", name);
4407 type = error_mark_node;
4411 /* Now figure out the structure of the declarator proper.
4412 Descend through it, creating more complex types, until we reach
4413 the declared identifier (or NULL_TREE, in an absolute declarator). */
4415 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4417 if (type == error_mark_node)
4419 declarator = TREE_OPERAND (declarator, 0);
4423 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4424 an INDIRECT_REF (for *...),
4425 a CALL_EXPR (for ...(...)),
4426 an identifier (for the name being declared)
4427 or a null pointer (for the place in an absolute declarator
4428 where the name was omitted).
4429 For the last two cases, we have just exited the loop.
4431 At this point, TYPE is the type of elements of an array,
4432 or for a function to return, or for a pointer to point to.
4433 After this sequence of ifs, TYPE is the type of the
4434 array or function or pointer, and DECLARATOR has had its
4435 outermost layer removed. */
4437 if (TREE_CODE (declarator) == ARRAY_REF)
4439 register tree itype = NULL_TREE;
4440 register tree size = TREE_OPERAND (declarator, 1);
4441 /* An uninitialized decl with `extern' is a reference. */
4442 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4443 /* The index is a signed object `sizetype' bits wide. */
4444 tree index_type = signed_type (sizetype);
4446 declarator = TREE_OPERAND (declarator, 0);
4448 /* Check for some types that there cannot be arrays of. */
4450 if (TYPE_MAIN_VARIANT (type) == void_type_node)
4452 error ("declaration of `%s' as array of voids", name);
4453 type = error_mark_node;
4456 if (TREE_CODE (type) == FUNCTION_TYPE)
4458 error ("declaration of `%s' as array of functions", name);
4459 type = error_mark_node;
4462 if (size == error_mark_node)
4463 type = error_mark_node;
4465 if (type == error_mark_node)
4468 /* If this is a block level extern, it must live past the end
4469 of the function so that we can check it against other extern
4470 declarations (IDENTIFIER_LIMBO_VALUE). */
4471 if (extern_ref && allocation_temporary_p ())
4472 end_temporary_allocation ();
4474 /* If size was specified, set ITYPE to a range-type for that size.
4475 Otherwise, ITYPE remains null. finish_decl may figure it out
4476 from an initial value. */
4480 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4481 STRIP_TYPE_NOPS (size);
4483 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
4484 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
4486 error ("size of array `%s' has non-integer type", name);
4487 size = integer_one_node;
4490 if (pedantic && integer_zerop (size))
4491 pedwarn ("ANSI C forbids zero-size array `%s'", name);
4493 if (TREE_CODE (size) == INTEGER_CST)
4495 constant_expression_warning (size);
4496 if (tree_int_cst_sgn (size) < 0)
4498 error ("size of array `%s' is negative", name);
4499 size = integer_one_node;
4504 /* Make sure the array size remains visibly nonconstant
4505 even if it is (eg) a const variable with known value. */
4510 if (TREE_CONSTANT (size))
4511 pedwarn ("ANSI C forbids array `%s' whose size can't be evaluated", name);
4513 pedwarn ("ANSI C forbids variable-size array `%s'", name);
4517 /* Convert size to index_type, so that if it is a variable
4518 the computations will be done in the proper mode. */
4519 itype = fold (build (MINUS_EXPR, index_type,
4520 convert (index_type, size),
4521 convert (index_type, size_one_node)));
4523 /* If that overflowed, the array is too big.
4524 ??? While a size of INT_MAX+1 technically shouldn't cause
4525 an overflow (because we subtract 1), the overflow is recorded
4526 during the conversion to index_type, before the subtraction.
4527 Handling this case seems like an unnecessary complication. */
4528 if (TREE_OVERFLOW (itype))
4530 error ("size of array `%s' is too large", name);
4531 type = error_mark_node;
4536 itype = variable_size (itype);
4537 itype = build_index_type (itype);
4540 #if 0 /* This had bad results for pointers to arrays, as in
4541 union incomplete (*foo)[4]; */
4542 /* Complain about arrays of incomplete types, except in typedefs. */
4544 if (TYPE_SIZE (type) == 0
4545 /* Avoid multiple warnings for nested array types. */
4546 && TREE_CODE (type) != ARRAY_TYPE
4547 && !(specbits & (1 << (int) RID_TYPEDEF))
4548 && !C_TYPE_BEING_DEFINED (type))
4549 warning ("array type has incomplete element type");
4552 #if 0 /* We shouldn't have a function type here at all!
4553 Functions aren't allowed as array elements. */
4554 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4555 && (constp || volatilep))
4556 pedwarn ("ANSI C forbids const or volatile function types");
4559 /* Build the array type itself, then merge any constancy or
4560 volatility into the target type. We must do it in this order
4561 to ensure that the TYPE_MAIN_VARIANT field of the array type
4562 is set correctly. */
4564 type = build_array_type (type, itype);
4566 type = c_build_qualified_type (type, type_quals);
4568 #if 0 /* don't clear these; leave them set so that the array type
4569 or the variable is itself const or volatile. */
4570 type_quals = TYPE_UNQUALIFIED;
4574 C_TYPE_VARIABLE_SIZE (type) = 1;
4576 else if (TREE_CODE (declarator) == CALL_EXPR)
4578 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4579 || current_binding_level == global_binding_level);
4582 /* Declaring a function type.
4583 Make sure we have a valid type for the function to return. */
4584 if (type == error_mark_node)
4589 /* Warn about some types functions can't return. */
4591 if (TREE_CODE (type) == FUNCTION_TYPE)
4593 error ("`%s' declared as function returning a function", name);
4594 type = integer_type_node;
4596 if (TREE_CODE (type) == ARRAY_TYPE)
4598 error ("`%s' declared as function returning an array", name);
4599 type = integer_type_node;
4602 #ifndef TRADITIONAL_RETURN_FLOAT
4603 /* Traditionally, declaring return type float means double. */
4605 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4606 type = double_type_node;
4607 #endif /* TRADITIONAL_RETURN_FLOAT */
4609 /* If this is a block level extern, it must live past the end
4610 of the function so that we can check it against other extern
4611 declarations (IDENTIFIER_LIMBO_VALUE). */
4612 if (extern_ref && allocation_temporary_p ())
4613 end_temporary_allocation ();
4615 /* Construct the function type and go to the next
4616 inner layer of declarator. */
4618 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4620 /* Say it's a definition
4621 only for the CALL_EXPR
4622 closest to the identifier. */
4623 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4624 #if 0 /* This seems to be false. We turn off temporary allocation
4625 above in this function if -traditional.
4626 And this code caused inconsistent results with prototypes:
4627 callers would ignore them, and pass arguments wrong. */
4629 /* Omit the arg types if -traditional, since the arg types
4630 and the list links might not be permanent. */
4631 type = build_function_type (type,
4633 ? NULL_TREE : arg_types);
4635 /* Type qualifiers before the return type of the function
4636 qualify the return type, not the function type. */
4638 type = c_build_qualified_type (type, type_quals);
4639 type_quals = TYPE_UNQUALIFIED;
4641 type = build_function_type (type, arg_types);
4642 declarator = TREE_OPERAND (declarator, 0);
4644 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4645 the formal parameter list of this FUNCTION_TYPE to point to
4646 the FUNCTION_TYPE node itself. */
4651 for (link = last_function_parm_tags;
4653 link = TREE_CHAIN (link))
4654 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4657 else if (TREE_CODE (declarator) == INDIRECT_REF)
4659 /* Merge any constancy or volatility into the target type
4662 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4664 pedwarn ("ANSI C forbids qualified function types");
4666 type = c_build_qualified_type (type, type_quals);
4667 type_quals = TYPE_UNQUALIFIED;
4670 type = build_pointer_type (type);
4672 /* Process a list of type modifier keywords
4673 (such as const or volatile) that were given inside the `*'. */
4675 if (TREE_TYPE (declarator))
4677 register tree typemodlist;
4683 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4684 typemodlist = TREE_CHAIN (typemodlist))
4686 tree qualifier = TREE_VALUE (typemodlist);
4688 if (qualifier == ridpointers[(int) RID_CONST])
4690 else if (qualifier == ridpointers[(int) RID_VOLATILE])
4692 else if (qualifier == ridpointers[(int) RID_RESTRICT])
4697 error ("invalid type modifier within pointer declarator");
4701 pedwarn ("duplicate `const'");
4703 pedwarn ("duplicate `volatile'");
4705 pedwarn ("duplicate `restrict'");
4707 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4708 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4709 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4712 declarator = TREE_OPERAND (declarator, 0);
4719 /* Now TYPE has the actual type. */
4721 /* Did array size calculations overflow? */
4723 if (TREE_CODE (type) == ARRAY_TYPE
4725 && TREE_OVERFLOW (TYPE_SIZE (type)))
4726 error ("size of array `%s' is too large", name);
4728 /* If this is declaring a typedef name, return a TYPE_DECL. */
4730 if (specbits & (1 << (int) RID_TYPEDEF))
4733 /* Note that the grammar rejects storage classes
4734 in typenames, fields or parameters */
4735 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4737 pedwarn ("ANSI C forbids qualified function types");
4739 type = c_build_qualified_type (type, type_quals);
4740 decl = build_decl (TYPE_DECL, declarator, type);
4741 if ((specbits & (1 << (int) RID_SIGNED))
4742 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4743 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4748 /* Detect the case of an array type of unspecified size
4749 which came, as such, direct from a typedef name.
4750 We must copy the type, so that each identifier gets
4751 a distinct type, so that each identifier's size can be
4752 controlled separately by its own initializer. */
4754 if (type != 0 && typedef_type != 0
4755 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type)
4756 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0)
4758 type = build_array_type (TREE_TYPE (type), 0);
4760 C_TYPE_VARIABLE_SIZE (type) = 1;
4763 /* If this is a type name (such as, in a cast or sizeof),
4764 compute the type and return it now. */
4766 if (decl_context == TYPENAME)
4768 /* Note that the grammar rejects storage classes
4769 in typenames, fields or parameters */
4770 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4772 pedwarn ("ANSI C forbids const or volatile function types");
4774 type = c_build_qualified_type (type, type_quals);
4779 /* Aside from typedefs and type names (handle above),
4780 `void' at top level (not within pointer)
4781 is allowed only in public variables.
4782 We don't complain about parms either, but that is because
4783 a better error message can be made later. */
4785 if (TYPE_MAIN_VARIANT (type) == void_type_node && decl_context != PARM
4786 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4787 && ((specbits & (1 << (int) RID_EXTERN))
4788 || (current_binding_level == global_binding_level
4790 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4792 error ("variable or field `%s' declared void", name);
4793 type = integer_type_node;
4796 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4797 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4802 if (decl_context == PARM)
4804 tree type_as_written = type;
4807 /* A parameter declared as an array of T is really a pointer to T.
4808 One declared as a function is really a pointer to a function. */
4810 if (TREE_CODE (type) == ARRAY_TYPE)
4812 /* Transfer const-ness of array into that of type pointed to. */
4813 type = TREE_TYPE (type);
4815 type = c_build_qualified_type (type, type_quals);
4816 type = build_pointer_type (type);
4817 type_quals = TYPE_UNQUALIFIED;
4820 else if (TREE_CODE (type) == FUNCTION_TYPE)
4822 if (pedantic && type_quals)
4823 pedwarn ("ANSI C forbids qualified function types");
4825 type = c_build_qualified_type (type, type_quals);
4826 type = build_pointer_type (type);
4827 type_quals = TYPE_UNQUALIFIED;
4830 decl = build_decl (PARM_DECL, declarator, type);
4832 C_DECL_VARIABLE_SIZE (decl) = 1;
4834 /* Compute the type actually passed in the parmlist,
4835 for the case where there is no prototype.
4836 (For example, shorts and chars are passed as ints.)
4837 When there is a prototype, this is overridden later. */
4839 DECL_ARG_TYPE (decl) = type;
4840 main_type = (type == error_mark_node
4842 : TYPE_MAIN_VARIANT (type));
4843 if (main_type == float_type_node)
4844 DECL_ARG_TYPE (decl) = double_type_node;
4845 /* Don't use TYPE_PRECISION to decide whether to promote,
4846 because we should convert short if it's the same size as int,
4847 but we should not convert long if it's the same size as int. */
4848 else if (TREE_CODE (main_type) != ERROR_MARK
4849 && C_PROMOTING_INTEGER_TYPE_P (main_type))
4851 if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)
4852 && TREE_UNSIGNED (type))
4853 DECL_ARG_TYPE (decl) = unsigned_type_node;
4855 DECL_ARG_TYPE (decl) = integer_type_node;
4858 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4860 else if (decl_context == FIELD)
4862 /* Structure field. It may not be a function. */
4864 if (TREE_CODE (type) == FUNCTION_TYPE)
4866 error ("field `%s' declared as a function", name);
4867 type = build_pointer_type (type);
4869 else if (TREE_CODE (type) != ERROR_MARK && TYPE_SIZE (type) == 0)
4871 error ("field `%s' has incomplete type", name);
4872 type = error_mark_node;
4874 /* Move type qualifiers down to element of an array. */
4875 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4877 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4879 TYPE_DOMAIN (type));
4880 #if 0 /* Leave the field const or volatile as well. */
4881 type_quals = TYPE_UNQUALIFIED;
4884 decl = build_decl (FIELD_DECL, declarator, type);
4886 C_DECL_VARIABLE_SIZE (decl) = 1;
4888 else if (TREE_CODE (type) == FUNCTION_TYPE)
4890 /* Every function declaration is "external"
4891 except for those which are inside a function body
4892 in which `auto' is used.
4893 That is a case not specified by ANSI C,
4894 and we use it for forward declarations for nested functions. */
4895 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4896 || current_binding_level == global_binding_level);
4898 if (specbits & (1 << (int) RID_AUTO)
4899 && (pedantic || current_binding_level == global_binding_level))
4900 pedwarn ("invalid storage class for function `%s'", name);
4901 if (specbits & (1 << (int) RID_REGISTER))
4902 error ("invalid storage class for function `%s'", name);
4903 /* Function declaration not at top level.
4904 Storage classes other than `extern' are not allowed
4905 and `extern' makes no difference. */
4906 if (current_binding_level != global_binding_level
4907 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4909 pedwarn ("invalid storage class for function `%s'", name);
4911 /* If this is a block level extern, it must live past the end
4912 of the function so that we can check it against other
4913 extern declarations (IDENTIFIER_LIMBO_VALUE). */
4914 if (extern_ref && allocation_temporary_p ())
4915 end_temporary_allocation ();
4917 decl = build_decl (FUNCTION_DECL, declarator, type);
4918 decl = build_decl_attribute_variant (decl, decl_machine_attr);
4920 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4921 pedwarn ("ANSI C forbids qualified function types");
4924 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl))) == void_type_node
4925 && TYPE_QUALS (TREE_TYPE (TREE_TYPE (decl)))
4926 && ! DECL_IN_SYSTEM_HEADER (decl))
4927 pedwarn ("ANSI C forbids qualified void function return type");
4929 /* GNU C interprets a `volatile void' return type to indicate
4930 that the function does not return. */
4931 if ((type_quals & TYPE_QUAL_VOLATILE)
4932 && TREE_TYPE (TREE_TYPE (decl)) != void_type_node)
4933 warning ("`noreturn' function returns non-void value");
4936 DECL_EXTERNAL (decl) = 1;
4937 /* Record absence of global scope for `static' or `auto'. */
4939 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4941 /* Record presence of `inline', if it is reasonable. */
4944 if (! strcmp (IDENTIFIER_POINTER (declarator), "main"))
4945 warning ("cannot inline function `main'");
4947 /* Assume that otherwise the function can be inlined. */
4948 DECL_INLINE (decl) = 1;
4950 if (specbits & (1 << (int) RID_EXTERN))
4951 current_extern_inline = 1;
4956 /* It's a variable. */
4957 /* An uninitialized decl with `extern' is a reference. */
4958 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4960 /* Move type qualifiers down to element of an array. */
4961 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4963 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4965 TYPE_DOMAIN (type));
4966 #if 0 /* Leave the variable const or volatile as well. */
4967 type_quals = TYPE_UNQUALIFIED;
4971 /* If this is a block level extern, it must live past the end
4972 of the function so that we can check it against other
4973 extern declarations (IDENTIFIER_LIMBO_VALUE). */
4974 if (extern_ref && allocation_temporary_p ())
4975 end_temporary_allocation ();
4977 decl = build_decl (VAR_DECL, declarator, type);
4979 C_DECL_VARIABLE_SIZE (decl) = 1;
4982 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4984 DECL_EXTERNAL (decl) = extern_ref;
4985 /* At top level, the presence of a `static' or `register' storage
4986 class specifier, or the absence of all storage class specifiers
4987 makes this declaration a definition (perhaps tentative). Also,
4988 the absence of both `static' and `register' makes it public. */
4989 if (current_binding_level == global_binding_level)
4993 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
4994 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
4996 /* Not at top level, only `static' makes a static definition. */
4999 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
5000 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
5003 if (specbits & 1 << (int) RID_ITERATOR)
5004 ITERATOR_P (decl) = 1;
5007 /* Record `register' declaration for warnings on &
5008 and in case doing stupid register allocation. */
5010 if (specbits & (1 << (int) RID_REGISTER))
5011 DECL_REGISTER (decl) = 1;
5013 /* Record constancy and volatility. */
5014 c_apply_type_quals_to_decl (type_quals, decl);
5016 /* If a type has volatile components, it should be stored in memory.
5017 Otherwise, the fact that those components are volatile
5018 will be ignored, and would even crash the compiler. */
5019 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
5020 mark_addressable (decl);
5028 /* Decode the parameter-list info for a function type or function definition.
5029 The argument is the value returned by `get_parm_info' (or made in parse.y
5030 if there is an identifier list instead of a parameter decl list).
5031 These two functions are separate because when a function returns
5032 or receives functions then each is called multiple times but the order
5033 of calls is different. The last call to `grokparms' is always the one
5034 that contains the formal parameter names of a function definition.
5036 Store in `last_function_parms' a chain of the decls of parms.
5037 Also store in `last_function_parm_tags' a chain of the struct, union,
5038 and enum tags declared among the parms.
5040 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5042 FUNCDEF_FLAG is nonzero for a function definition, 0 for
5043 a mere declaration. A nonempty identifier-list gets an error message
5044 when FUNCDEF_FLAG is zero. */
5047 grokparms (parms_info, funcdef_flag)
5051 tree first_parm = TREE_CHAIN (parms_info);
5053 last_function_parms = TREE_PURPOSE (parms_info);
5054 last_function_parm_tags = TREE_VALUE (parms_info);
5056 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
5057 && !in_system_header)
5058 warning ("function declaration isn't a prototype");
5061 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
5064 pedwarn ("parameter names (without types) in function declaration");
5066 last_function_parms = first_parm;
5073 /* We no longer test FUNCDEF_FLAG.
5074 If the arg types are incomplete in a declaration,
5075 they must include undefined tags.
5076 These tags can never be defined in the scope of the declaration,
5077 so the types can never be completed,
5078 and no call can be compiled successfully. */
5080 /* In a fcn definition, arg types must be complete. */
5083 for (parm = last_function_parms, typelt = first_parm;
5085 parm = TREE_CHAIN (parm))
5086 /* Skip over any enumeration constants declared here. */
5087 if (TREE_CODE (parm) == PARM_DECL)
5089 /* Barf if the parameter itself has an incomplete type. */
5090 tree type = TREE_VALUE (typelt);
5091 if (TYPE_SIZE (type) == 0)
5093 if (funcdef_flag && DECL_NAME (parm) != 0)
5094 error ("parameter `%s' has incomplete type",
5095 IDENTIFIER_POINTER (DECL_NAME (parm)));
5097 warning ("parameter has incomplete type");
5100 TREE_VALUE (typelt) = error_mark_node;
5101 TREE_TYPE (parm) = error_mark_node;
5104 #if 0 /* This has been replaced by parm_tags_warning
5105 which uses a more accurate criterion for what to warn about. */
5108 /* Now warn if is a pointer to an incomplete type. */
5109 while (TREE_CODE (type) == POINTER_TYPE
5110 || TREE_CODE (type) == REFERENCE_TYPE)
5111 type = TREE_TYPE (type);
5112 type = TYPE_MAIN_VARIANT (type);
5113 if (TYPE_SIZE (type) == 0)
5115 if (DECL_NAME (parm) != 0)
5116 warning ("parameter `%s' points to incomplete type",
5117 IDENTIFIER_POINTER (DECL_NAME (parm)));
5119 warning ("parameter points to incomplete type");
5123 typelt = TREE_CHAIN (typelt);
5126 /* Allocate the list of types the way we allocate a type. */
5127 if (first_parm && ! TREE_PERMANENT (first_parm))
5129 /* Construct a copy of the list of types
5130 on the saveable obstack. */
5132 for (typelt = first_parm; typelt; typelt = TREE_CHAIN (typelt))
5133 result = saveable_tree_cons (NULL_TREE, TREE_VALUE (typelt),
5135 return nreverse (result);
5138 /* The list we have is permanent already. */
5144 /* Return a tree_list node with info on a parameter list just parsed.
5145 The TREE_PURPOSE is a chain of decls of those parms.
5146 The TREE_VALUE is a list of structure, union and enum tags defined.
5147 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5148 This tree_list node is later fed to `grokparms'.
5150 VOID_AT_END nonzero means append `void' to the end of the type-list.
5151 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5154 get_parm_info (void_at_end)
5157 register tree decl, t;
5158 register tree types = 0;
5160 tree tags = gettags ();
5161 tree parms = getdecls ();
5163 tree order = current_binding_level->parm_order;
5165 /* Just `void' (and no ellipsis) is special. There are really no parms. */
5166 if (void_at_end && parms != 0
5167 && TREE_CHAIN (parms) == 0
5168 && TYPE_MAIN_VARIANT (TREE_TYPE (parms)) == void_type_node
5169 && DECL_NAME (parms) == 0)
5172 storedecls (NULL_TREE);
5173 return saveable_tree_cons (NULL_TREE, NULL_TREE,
5174 saveable_tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5177 /* Extract enumerator values and other non-parms declared with the parms.
5178 Likewise any forward parm decls that didn't have real parm decls. */
5179 for (decl = parms; decl; )
5181 tree next = TREE_CHAIN (decl);
5183 if (TREE_CODE (decl) != PARM_DECL)
5185 TREE_CHAIN (decl) = new_parms;
5188 else if (TREE_ASM_WRITTEN (decl))
5190 error_with_decl (decl, "parameter `%s' has just a forward declaration");
5191 TREE_CHAIN (decl) = new_parms;
5197 /* Put the parm decls back in the order they were in in the parm list. */
5198 for (t = order; t; t = TREE_CHAIN (t))
5201 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5203 TREE_CHAIN (TREE_VALUE (t)) = 0;
5206 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5209 /* Store the parmlist in the binding level since the old one
5210 is no longer a valid list. (We have changed the chain pointers.) */
5211 storedecls (new_parms);
5213 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5214 /* There may also be declarations for enumerators if an enumeration
5215 type is declared among the parms. Ignore them here. */
5216 if (TREE_CODE (decl) == PARM_DECL)
5218 /* Since there is a prototype,
5219 args are passed in their declared types. */
5220 tree type = TREE_TYPE (decl);
5221 DECL_ARG_TYPE (decl) = type;
5222 #ifdef PROMOTE_PROTOTYPES
5223 if ((TREE_CODE (type) == INTEGER_TYPE
5224 || TREE_CODE (type) == ENUMERAL_TYPE)
5225 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5226 DECL_ARG_TYPE (decl) = integer_type_node;
5229 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5230 if (TYPE_MAIN_VARIANT (TREE_VALUE (types)) == void_type_node && ! erred
5231 && DECL_NAME (decl) == 0)
5233 error ("`void' in parameter list must be the entire list");
5239 return saveable_tree_cons (new_parms, tags,
5240 nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types)));
5242 return saveable_tree_cons (new_parms, tags, nreverse (types));
5245 /* At end of parameter list, warn about any struct, union or enum tags
5246 defined within. Do so because these types cannot ever become complete. */
5249 parmlist_tags_warning ()
5254 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5256 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5257 /* An anonymous union parm type is meaningful as a GNU extension.
5258 So don't warn for that. */
5259 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5261 if (TREE_PURPOSE (elt) != 0)
5262 warning ("`%s %s' declared inside parameter list",
5263 (code == RECORD_TYPE ? "struct"
5264 : code == UNION_TYPE ? "union"
5266 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5268 warning ("anonymous %s declared inside parameter list",
5269 (code == RECORD_TYPE ? "struct"
5270 : code == UNION_TYPE ? "union"
5275 warning ("its scope is only this definition or declaration, which is probably not what you want.");
5281 /* Get the struct, enum or union (CODE says which) with tag NAME.
5282 Define the tag as a forward-reference if it is not defined. */
5285 xref_tag (code, name)
5286 enum tree_code code;
5289 int temporary = allocation_temporary_p ();
5291 /* If a cross reference is requested, look up the type
5292 already defined for this tag and return it. */
5294 register tree ref = lookup_tag (code, name, current_binding_level, 0);
5295 /* Even if this is the wrong type of tag, return what we found.
5296 There will be an error message anyway, from pending_xref_error.
5297 If we create an empty xref just for an invalid use of the type,
5298 the main result is to create lots of superfluous error messages. */
5302 push_obstacks_nochange ();
5304 if (current_binding_level == global_binding_level && temporary)
5305 end_temporary_allocation ();
5307 /* If no such tag is yet defined, create a forward-reference node
5308 and record it as the "definition".
5309 When a real declaration of this type is found,
5310 the forward-reference will be altered into a real type. */
5312 ref = make_node (code);
5313 if (code == ENUMERAL_TYPE)
5315 /* (In ANSI, Enums can be referred to only if already defined.) */
5317 pedwarn ("ANSI C forbids forward references to `enum' types");
5318 /* Give the type a default layout like unsigned int
5319 to avoid crashing if it does not get defined. */
5320 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5321 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5322 TREE_UNSIGNED (ref) = 1;
5323 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5324 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5325 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5328 pushtag (name, ref);
5335 /* Make sure that the tag NAME is defined *in the current binding level*
5336 at least as a forward reference.
5337 CODE says which kind of tag NAME ought to be.
5339 We also do a push_obstacks_nochange
5340 whose matching pop is in finish_struct. */
5343 start_struct (code, name)
5344 enum tree_code code;
5347 /* If there is already a tag defined at this binding level
5348 (as a forward reference), just return it. */
5350 register tree ref = 0;
5352 push_obstacks_nochange ();
5353 if (current_binding_level == global_binding_level)
5354 end_temporary_allocation ();
5357 ref = lookup_tag (code, name, current_binding_level, 1);
5358 if (ref && TREE_CODE (ref) == code)
5360 C_TYPE_BEING_DEFINED (ref) = 1;
5361 TYPE_PACKED (ref) = flag_pack_struct;
5362 if (TYPE_FIELDS (ref))
5363 error ((code == UNION_TYPE ? "redefinition of `union %s'"
5364 : "redefinition of `struct %s'"),
5365 IDENTIFIER_POINTER (name));
5370 /* Otherwise create a forward-reference just so the tag is in scope. */
5372 ref = make_node (code);
5373 pushtag (name, ref);
5374 C_TYPE_BEING_DEFINED (ref) = 1;
5375 TYPE_PACKED (ref) = flag_pack_struct;
5379 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5380 of a structure component, returning a FIELD_DECL node.
5381 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5383 This is done during the parsing of the struct declaration.
5384 The FIELD_DECL nodes are chained together and the lot of them
5385 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5388 grokfield (filename, line, declarator, declspecs, width)
5389 const char *filename ATTRIBUTE_UNUSED;
5390 int line ATTRIBUTE_UNUSED;
5391 tree declarator, declspecs, width;
5395 /* The corresponding pop_obstacks is in finish_decl. */
5396 push_obstacks_nochange ();
5398 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5400 finish_decl (value, NULL_TREE, NULL_TREE);
5401 DECL_INITIAL (value) = width;
5403 maybe_objc_check_decl (value);
5407 /* Function to help qsort sort FIELD_DECLs by name order. */
5410 field_decl_cmp (xp, yp)
5411 const GENERIC_PTR xp;
5412 const GENERIC_PTR yp;
5414 tree *x = (tree *)xp, *y = (tree *)yp;
5416 if (DECL_NAME (*x) == DECL_NAME (*y))
5418 if (DECL_NAME (*x) == NULL)
5420 if (DECL_NAME (*y) == NULL)
5422 if (DECL_NAME (*x) < DECL_NAME (*y))
5427 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5428 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5429 ATTRIBUTES are attributes to be applied to the structure.
5431 We also do a pop_obstacks to match the push in start_struct. */
5434 finish_struct (t, fieldlist, attributes)
5441 int toplevel = global_binding_level == current_binding_level;
5443 /* If this type was previously laid out as a forward reference,
5444 make sure we lay it out again. */
5448 decl_attributes (t, attributes, NULL_TREE);
5450 /* Nameless union parm types are useful as GCC extension. */
5451 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5452 /* Otherwise, warn about any struct or union def. in parmlist. */
5453 if (in_parm_level_p ())
5456 pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5457 : "structure defined inside parms"));
5458 else if (! flag_traditional)
5459 warning ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5460 : "structure defined inside parms"));
5463 old_momentary = suspend_momentary ();
5467 for (x = fieldlist; x; x = TREE_CHAIN (x))
5468 if (DECL_NAME (x) != 0)
5473 ? "%s has no named members"
5474 : "%s has no members"),
5475 TREE_CODE (t) == UNION_TYPE ? "union" : "struct");
5478 /* Install struct as DECL_CONTEXT of each field decl.
5479 Also process specified field sizes.
5480 Set DECL_FIELD_SIZE to the specified size, or 0 if none specified.
5481 The specified size is found in the DECL_INITIAL.
5482 Store 0 there, except for ": 0" fields (so we can find them
5483 and delete them, below). */
5485 for (x = fieldlist; x; x = TREE_CHAIN (x))
5487 DECL_CONTEXT (x) = t;
5488 DECL_PACKED (x) |= TYPE_PACKED (t);
5489 DECL_FIELD_SIZE (x) = 0;
5491 /* If any field is const, the structure type is pseudo-const. */
5492 if (TREE_READONLY (x))
5493 C_TYPE_FIELDS_READONLY (t) = 1;
5496 /* A field that is pseudo-const makes the structure likewise. */
5497 tree t1 = TREE_TYPE (x);
5498 while (TREE_CODE (t1) == ARRAY_TYPE)
5499 t1 = TREE_TYPE (t1);
5500 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5501 && C_TYPE_FIELDS_READONLY (t1))
5502 C_TYPE_FIELDS_READONLY (t) = 1;
5505 /* Any field that is volatile means variables of this type must be
5506 treated in some ways as volatile. */
5507 if (TREE_THIS_VOLATILE (x))
5508 C_TYPE_FIELDS_VOLATILE (t) = 1;
5510 /* Any field of nominal variable size implies structure is too. */
5511 if (C_DECL_VARIABLE_SIZE (x))
5512 C_TYPE_VARIABLE_SIZE (t) = 1;
5514 /* Detect invalid nested redefinition. */
5515 if (TREE_TYPE (x) == t)
5516 error ("nested redefinition of `%s'",
5517 IDENTIFIER_POINTER (TYPE_NAME (t)));
5519 /* Detect invalid bit-field size. */
5520 if (DECL_INITIAL (x))
5521 STRIP_NOPS (DECL_INITIAL (x));
5522 if (DECL_INITIAL (x))
5524 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5525 constant_expression_warning (DECL_INITIAL (x));
5528 error_with_decl (x, "bit-field `%s' width not an integer constant");
5529 DECL_INITIAL (x) = NULL;
5533 /* Detect invalid bit-field type. */
5534 if (DECL_INITIAL (x)
5535 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5536 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5538 error_with_decl (x, "bit-field `%s' has invalid type");
5539 DECL_INITIAL (x) = NULL;
5541 if (DECL_INITIAL (x) && pedantic
5542 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5543 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5544 /* Accept an enum that's equivalent to int or unsigned int. */
5545 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5546 && (TYPE_PRECISION (TREE_TYPE (x))
5547 == TYPE_PRECISION (integer_type_node))))
5548 pedwarn_with_decl (x, "bit-field `%s' type invalid in ANSI C");
5550 /* Detect and ignore out of range field width. */
5551 if (DECL_INITIAL (x))
5553 unsigned HOST_WIDE_INT width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5555 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5557 DECL_INITIAL (x) = NULL;
5558 error_with_decl (x, "negative width in bit-field `%s'");
5560 else if (TREE_INT_CST_HIGH (DECL_INITIAL (x)) != 0
5561 || width > TYPE_PRECISION (TREE_TYPE (x)))
5563 DECL_INITIAL (x) = NULL;
5564 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5566 else if (width == 0 && DECL_NAME (x) != 0)
5568 error_with_decl (x, "zero width for bit-field `%s'");
5569 DECL_INITIAL (x) = NULL;
5573 /* Process valid field width. */
5574 if (DECL_INITIAL (x))
5576 register int width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5578 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5579 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5580 TREE_UNSIGNED (TREE_TYPE (x)))
5581 || width < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5582 TREE_UNSIGNED (TREE_TYPE (x)))))
5583 warning_with_decl (x, "`%s' is narrower than values of its type");
5585 DECL_FIELD_SIZE (x) = width;
5586 DECL_BIT_FIELD (x) = DECL_C_BIT_FIELD (x) = 1;
5587 DECL_INITIAL (x) = NULL;
5591 /* field size 0 => force desired amount of alignment. */
5592 #ifdef EMPTY_FIELD_BOUNDARY
5593 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5595 #ifdef PCC_BITFIELD_TYPE_MATTERS
5596 if (PCC_BITFIELD_TYPE_MATTERS)
5597 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5598 TYPE_ALIGN (TREE_TYPE (x)));
5602 else if (TREE_TYPE (x) != error_mark_node)
5604 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5605 : TYPE_ALIGN (TREE_TYPE (x)));
5606 /* Non-bit-fields are aligned for their type, except packed
5607 fields which require only BITS_PER_UNIT alignment. */
5608 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5612 /* Now DECL_INITIAL is null on all members. */
5614 /* Delete all duplicate fields from the fieldlist */
5615 for (x = fieldlist; x && TREE_CHAIN (x);)
5616 /* Anonymous fields aren't duplicates. */
5617 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5621 register tree y = fieldlist;
5625 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5631 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5633 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5634 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5636 else x = TREE_CHAIN (x);
5639 /* Now we have the nearly final fieldlist. Record it,
5640 then lay out the structure or union (including the fields). */
5642 TYPE_FIELDS (t) = fieldlist;
5646 /* Delete all zero-width bit-fields from the front of the fieldlist */
5648 && DECL_INITIAL (fieldlist))
5649 fieldlist = TREE_CHAIN (fieldlist);
5650 /* Delete all such members from the rest of the fieldlist */
5651 for (x = fieldlist; x;)
5653 if (TREE_CHAIN (x) && DECL_INITIAL (TREE_CHAIN (x)))
5654 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5655 else x = TREE_CHAIN (x);
5658 /* Now we have the truly final field list.
5659 Store it in this type and in the variants. */
5661 TYPE_FIELDS (t) = fieldlist;
5663 /* If there are lots of fields, sort so we can look through them fast.
5664 We arbitrarily consider 16 or more elts to be "a lot". */
5668 for (x = fieldlist; x; x = TREE_CHAIN (x))
5679 len += list_length (x);
5680 /* Use the same allocation policy here that make_node uses, to
5681 ensure that this lives as long as the rest of the struct decl.
5682 All decls in an inline function need to be saved. */
5683 if (allocation_temporary_p ())
5684 space = savealloc (sizeof (struct lang_type) + len * sizeof (tree));
5686 space = oballoc (sizeof (struct lang_type) + len * sizeof (tree));
5688 TYPE_LANG_SPECIFIC (t) = (struct lang_type *) space;
5689 TYPE_LANG_SPECIFIC (t)->len = len;
5691 field_array = &TYPE_LANG_SPECIFIC (t)->elts[0];
5693 for (x = fieldlist; x; x = TREE_CHAIN (x))
5694 field_array[len++] = x;
5696 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5700 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5702 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5703 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5704 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5707 /* If this was supposed to be a transparent union, but we can't
5708 make it one, warn and turn off the flag. */
5709 if (TREE_CODE (t) == UNION_TYPE
5710 && TYPE_TRANSPARENT_UNION (t)
5711 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5713 TYPE_TRANSPARENT_UNION (t) = 0;
5714 warning ("union cannot be made transparent");
5717 /* If this structure or union completes the type of any previous
5718 variable declaration, lay it out and output its rtl. */
5720 if (current_binding_level->n_incomplete != 0)
5723 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5725 if (TREE_TYPE (decl) == t
5726 && TREE_CODE (decl) != TYPE_DECL)
5728 layout_decl (decl, 0);
5729 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5730 maybe_objc_check_decl (decl);
5731 rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0);
5734 --current_binding_level->n_incomplete;
5736 else if (TYPE_SIZE (TREE_TYPE (decl)) == 0
5737 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5739 tree element = TREE_TYPE (decl);
5740 while (TREE_CODE (element) == ARRAY_TYPE)
5741 element = TREE_TYPE (element);
5743 layout_array_type (TREE_TYPE (decl));
5748 resume_momentary (old_momentary);
5750 /* Finish debugging output for this type. */
5751 rest_of_type_compilation (t, toplevel);
5753 /* The matching push is in start_struct. */
5759 /* Lay out the type T, and its element type, and so on. */
5762 layout_array_type (t)
5765 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5766 layout_array_type (TREE_TYPE (t));
5770 /* Begin compiling the definition of an enumeration type.
5771 NAME is its name (or null if anonymous).
5772 Returns the type object, as yet incomplete.
5773 Also records info about it so that build_enumerator
5774 may be used to declare the individual values as they are read. */
5780 register tree enumtype = 0;
5782 /* If this is the real definition for a previous forward reference,
5783 fill in the contents in the same object that used to be the
5784 forward reference. */
5787 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5789 /* The corresponding pop_obstacks is in finish_enum. */
5790 push_obstacks_nochange ();
5791 /* If these symbols and types are global, make them permanent. */
5792 if (current_binding_level == global_binding_level)
5793 end_temporary_allocation ();
5795 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5797 enumtype = make_node (ENUMERAL_TYPE);
5798 pushtag (name, enumtype);
5801 C_TYPE_BEING_DEFINED (enumtype) = 1;
5803 if (TYPE_VALUES (enumtype) != 0)
5805 /* This enum is a named one that has been declared already. */
5806 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5808 /* Completely replace its old definition.
5809 The old enumerators remain defined, however. */
5810 TYPE_VALUES (enumtype) = 0;
5813 enum_next_value = integer_zero_node;
5816 if (flag_short_enums)
5817 TYPE_PACKED (enumtype) = 1;
5822 /* After processing and defining all the values of an enumeration type,
5823 install their decls in the enumeration type and finish it off.
5824 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5825 and ATTRIBUTES are the specified attributes.
5826 Returns ENUMTYPE. */
5829 finish_enum (enumtype, values, attributes)
5834 register tree pair, tem;
5835 tree minnode = 0, maxnode = 0;
5836 int lowprec, highprec, precision;
5837 int toplevel = global_binding_level == current_binding_level;
5839 if (in_parm_level_p ())
5840 warning ("enum defined inside parms");
5842 decl_attributes (enumtype, attributes, NULL_TREE);
5844 /* Calculate the maximum value of any enumerator in this type. */
5846 if (values == error_mark_node)
5847 minnode = maxnode = integer_zero_node;
5849 for (pair = values; pair; pair = TREE_CHAIN (pair))
5851 tree value = TREE_VALUE (pair);
5853 minnode = maxnode = TREE_VALUE (pair);
5856 if (tree_int_cst_lt (maxnode, value))
5858 if (tree_int_cst_lt (value, minnode))
5863 TYPE_MIN_VALUE (enumtype) = minnode;
5864 TYPE_MAX_VALUE (enumtype) = maxnode;
5866 /* An enum can have some negative values; then it is signed. */
5867 TREE_UNSIGNED (enumtype) = tree_int_cst_sgn (minnode) >= 0;
5869 /* Determine the precision this type needs. */
5871 lowprec = min_precision (minnode, TREE_UNSIGNED (enumtype));
5872 highprec = min_precision (maxnode, TREE_UNSIGNED (enumtype));
5873 precision = MAX (lowprec, highprec);
5875 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5877 tree narrowest = type_for_size (precision, 1);
5880 warning ("enumeration values exceed range of largest integer");
5881 narrowest = long_long_integer_type_node;
5884 TYPE_PRECISION (enumtype) = TYPE_PRECISION (narrowest);
5887 TYPE_PRECISION (enumtype) = TYPE_PRECISION (integer_type_node);
5889 TYPE_SIZE (enumtype) = 0;
5890 layout_type (enumtype);
5892 if (values != error_mark_node)
5894 /* Change the type of the enumerators to be the enum type.
5895 Formerly this was done only for enums that fit in an int,
5896 but the comment said it was done only for enums wider than int.
5897 It seems necessary to do this for wide enums,
5898 and best not to change what's done for ordinary narrower ones. */
5899 for (pair = values; pair; pair = TREE_CHAIN (pair))
5901 TREE_TYPE (TREE_PURPOSE (pair)) = enumtype;
5902 DECL_SIZE (TREE_PURPOSE (pair)) = TYPE_SIZE (enumtype);
5903 if (TREE_CODE (TREE_PURPOSE (pair)) != FUNCTION_DECL)
5904 DECL_ALIGN (TREE_PURPOSE (pair)) = TYPE_ALIGN (enumtype);
5907 /* Replace the decl nodes in VALUES with their names. */
5908 for (pair = values; pair; pair = TREE_CHAIN (pair))
5909 TREE_PURPOSE (pair) = DECL_NAME (TREE_PURPOSE (pair));
5911 TYPE_VALUES (enumtype) = values;
5914 /* Fix up all variant types of this enum type. */
5915 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5917 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5918 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5919 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5920 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5921 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5922 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5923 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5924 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5925 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5928 /* Finish debugging output for this type. */
5929 rest_of_type_compilation (enumtype, toplevel);
5931 /* This matches a push in start_enum. */
5937 /* Build and install a CONST_DECL for one value of the
5938 current enumeration type (one that was begun with start_enum).
5939 Return a tree-list containing the CONST_DECL and its value.
5940 Assignment of sequential values by default is handled here. */
5943 build_enumerator (name, value)
5946 register tree decl, type;
5948 /* Validate and default VALUE. */
5950 /* Remove no-op casts from the value. */
5952 STRIP_TYPE_NOPS (value);
5956 if (TREE_CODE (value) == INTEGER_CST)
5958 value = default_conversion (value);
5959 constant_expression_warning (value);
5963 error ("enumerator value for `%s' not integer constant",
5964 IDENTIFIER_POINTER (name));
5969 /* Default based on previous value. */
5970 /* It should no longer be possible to have NON_LVALUE_EXPR
5974 value = enum_next_value;
5976 error ("overflow in enumeration values");
5979 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5981 pedwarn ("ANSI C restricts enumerator values to range of `int'");
5982 value = integer_zero_node;
5985 /* Set basis for default for next value. */
5986 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5987 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5989 /* Now create a declaration for the enum value name. */
5991 type = TREE_TYPE (value);
5992 type = type_for_size (MAX (TYPE_PRECISION (type),
5993 TYPE_PRECISION (integer_type_node)),
5995 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
5996 && TREE_UNSIGNED (type)));
5998 decl = build_decl (CONST_DECL, name, type);
5999 DECL_INITIAL (decl) = value;
6000 TREE_TYPE (value) = type;
6003 return saveable_tree_cons (decl, value, NULL_TREE);
6006 /* Create the FUNCTION_DECL for a function definition.
6007 DECLSPECS, DECLARATOR, PREFIX_ATTRIBUTES and ATTRIBUTES are the parts of
6008 the declaration; they describe the function's name and the type it returns,
6009 but twisted together in a fashion that parallels the syntax of C.
6011 This function creates a binding context for the function body
6012 as well as setting up the FUNCTION_DECL in current_function_decl.
6014 Returns 1 on success. If the DECLARATOR is not suitable for a function
6015 (it defines a datum instead), we return 0, which tells
6016 yyparse to report a parse error.
6018 NESTED is nonzero for a function nested within another function. */
6021 start_function (declspecs, declarator, prefix_attributes, attributes, nested)
6022 tree declarator, declspecs, prefix_attributes, attributes;
6025 tree decl1, old_decl;
6027 int old_immediate_size_expand = immediate_size_expand;
6029 current_function_returns_value = 0; /* Assume, until we see it does. */
6030 current_function_returns_null = 0;
6031 warn_about_return_type = 0;
6032 current_extern_inline = 0;
6033 c_function_varargs = 0;
6035 shadowed_labels = 0;
6037 /* Don't expand any sizes in the return type of the function. */
6038 immediate_size_expand = 0;
6040 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
6042 /* If the declarator is not suitable for a function definition,
6043 cause a syntax error. */
6046 immediate_size_expand = old_immediate_size_expand;
6050 decl_attributes (decl1, prefix_attributes, attributes);
6052 announce_function (decl1);
6054 if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl1))) == 0)
6056 error ("return-type is an incomplete type");
6057 /* Make it return void instead. */
6059 = build_function_type (void_type_node,
6060 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
6063 if (warn_about_return_type)
6064 warning ("return-type defaults to `int'");
6066 /* Save the parm names or decls from this function's declarator
6067 where store_parm_decls will find them. */
6068 current_function_parms = last_function_parms;
6069 current_function_parm_tags = last_function_parm_tags;
6071 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6072 error_mark_node is replaced below (in poplevel) with the BLOCK. */
6073 DECL_INITIAL (decl1) = error_mark_node;
6075 /* If this definition isn't a prototype and we had a prototype declaration
6076 before, copy the arg type info from that prototype.
6077 But not if what we had before was a builtin function. */
6078 old_decl = lookup_name_current_level (DECL_NAME (decl1));
6079 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
6080 && !DECL_BUILT_IN (old_decl)
6081 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6082 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
6083 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
6085 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
6086 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
6087 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
6090 /* If there is no explicit declaration, look for any out-of-scope implicit
6093 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
6095 /* Optionally warn of old-fashioned def with no previous prototype. */
6096 if (warn_strict_prototypes
6097 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6098 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
6099 warning ("function declaration isn't a prototype");
6100 /* Optionally warn of any global def with no previous prototype. */
6101 else if (warn_missing_prototypes
6102 && TREE_PUBLIC (decl1)
6103 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0)
6104 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
6105 warning_with_decl (decl1, "no previous prototype for `%s'");
6106 /* Optionally warn of any def with no previous prototype
6107 if the function has already been used. */
6108 else if (warn_missing_prototypes
6109 && old_decl != 0 && TREE_USED (old_decl)
6110 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6111 warning_with_decl (decl1,
6112 "`%s' was used with no prototype before its definition");
6113 /* Optionally warn of any global def with no previous declaration. */
6114 else if (warn_missing_declarations
6115 && TREE_PUBLIC (decl1)
6117 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
6118 warning_with_decl (decl1, "no previous declaration for `%s'");
6119 /* Optionally warn of any def with no previous declaration
6120 if the function has already been used. */
6121 else if (warn_missing_declarations
6122 && old_decl != 0 && TREE_USED (old_decl)
6123 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
6124 warning_with_decl (decl1,
6125 "`%s' was used with no declaration before its definition");
6127 /* This is a definition, not a reference.
6128 So normally clear DECL_EXTERNAL.
6129 However, `extern inline' acts like a declaration
6130 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6131 DECL_EXTERNAL (decl1) = current_extern_inline;
6133 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
6134 SET_DEFAULT_DECL_ATTRIBUTES (decl1, attributes);
6137 /* This function exists in static storage.
6138 (This does not mean `static' in the C sense!) */
6139 TREE_STATIC (decl1) = 1;
6141 /* A nested function is not global. */
6142 if (current_function_decl != 0)
6143 TREE_PUBLIC (decl1) = 0;
6145 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6147 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))) == 0)
6152 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6153 != integer_type_node)
6154 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
6156 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
6157 args = TREE_CHAIN (args))
6159 tree type = args ? TREE_VALUE (args) : 0;
6161 if (type == void_type_node)
6168 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6169 pedwarn_with_decl (decl1,
6170 "first argument of `%s' should be `int'");
6174 if (TREE_CODE (type) != POINTER_TYPE
6175 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6176 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6178 pedwarn_with_decl (decl1,
6179 "second argument of `%s' should be `char **'");
6183 if (TREE_CODE (type) != POINTER_TYPE
6184 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6185 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6187 pedwarn_with_decl (decl1,
6188 "third argument of `%s' should probably be `char **'");
6193 /* It is intentional that this message does not mention the third
6194 argument, which is warned for only pedantically, because it's
6195 blessed by mention in an appendix of the standard. */
6196 if (argct > 0 && (argct < 2 || argct > 3))
6197 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
6199 if (argct == 3 && pedantic)
6200 pedwarn_with_decl (decl1, "third argument of `%s' is deprecated");
6202 if (! TREE_PUBLIC (decl1))
6203 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
6206 /* Record the decl so that the function name is defined.
6207 If we already have a decl for this name, and it is a FUNCTION_DECL,
6208 use the old decl. */
6210 current_function_decl = pushdecl (decl1);
6213 declare_parm_level (1);
6214 current_binding_level->subblocks_tag_transparent = 1;
6216 make_function_rtl (current_function_decl);
6218 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6219 /* Promote the value to int before returning it. */
6220 if (C_PROMOTING_INTEGER_TYPE_P (restype))
6222 /* It retains unsignedness if traditional
6223 or if not really getting wider. */
6224 if (TREE_UNSIGNED (restype)
6225 && (flag_traditional
6226 || (TYPE_PRECISION (restype)
6227 == TYPE_PRECISION (integer_type_node))))
6228 restype = unsigned_type_node;
6230 restype = integer_type_node;
6232 DECL_RESULT (current_function_decl)
6233 = build_decl (RESULT_DECL, NULL_TREE, restype);
6236 /* Allocate further tree nodes temporarily during compilation
6237 of this function only. */
6238 temporary_allocation ();
6240 /* If this fcn was already referenced via a block-scope `extern' decl
6241 (or an implicit decl), propagate certain information about the usage. */
6242 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6243 TREE_ADDRESSABLE (current_function_decl) = 1;
6245 immediate_size_expand = old_immediate_size_expand;
6250 /* Record that this function is going to be a varargs function.
6251 This is called before store_parm_decls, which is too early
6252 to call mark_varargs directly. */
6257 c_function_varargs = 1;
6260 /* Store the parameter declarations into the current function declaration.
6261 This is called after parsing the parameter declarations, before
6262 digesting the body of the function.
6264 For an old-style definition, modify the function's type
6265 to specify at least the number of arguments. */
6270 register tree fndecl = current_function_decl;
6273 /* This is either a chain of PARM_DECLs (if a prototype was used)
6274 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6275 tree specparms = current_function_parms;
6277 /* This is a list of types declared among parms in a prototype. */
6278 tree parmtags = current_function_parm_tags;
6280 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6281 register tree parmdecls = getdecls ();
6283 /* This is a chain of any other decls that came in among the parm
6284 declarations. If a parm is declared with enum {foo, bar} x;
6285 then CONST_DECLs for foo and bar are put here. */
6288 /* Nonzero if this definition is written with a prototype. */
6291 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6293 /* This case is when the function was defined with an ANSI prototype.
6294 The parms already have decls, so we need not do anything here
6295 except record them as in effect
6296 and complain if any redundant old-style parm decls were written. */
6307 error_with_decl (fndecl,
6308 "parm types given both in parmlist and separately");
6309 /* Get rid of the erroneous decls; don't keep them on
6310 the list of parms, since they might not be PARM_DECLs. */
6311 for (decl = current_binding_level->names;
6312 decl; decl = TREE_CHAIN (decl))
6313 if (DECL_NAME (decl))
6314 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6315 for (link = current_binding_level->shadowed;
6316 link; link = TREE_CHAIN (link))
6317 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6318 current_binding_level->names = 0;
6319 current_binding_level->shadowed = 0;
6322 specparms = nreverse (specparms);
6323 for (parm = specparms; parm; parm = next)
6325 next = TREE_CHAIN (parm);
6326 if (TREE_CODE (parm) == PARM_DECL)
6328 if (DECL_NAME (parm) == 0)
6329 error_with_decl (parm, "parameter name omitted");
6330 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6332 error_with_decl (parm, "parameter `%s' declared void");
6333 /* Change the type to error_mark_node so this parameter
6334 will be ignored by assign_parms. */
6335 TREE_TYPE (parm) = error_mark_node;
6341 /* If we find an enum constant or a type tag,
6342 put it aside for the moment. */
6343 TREE_CHAIN (parm) = 0;
6344 others = chainon (others, parm);
6348 /* Get the decls in their original chain order
6349 and record in the function. */
6350 DECL_ARGUMENTS (fndecl) = getdecls ();
6353 /* If this function takes a variable number of arguments,
6354 add a phony parameter to the end of the parm list,
6355 to represent the position of the first unnamed argument. */
6356 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6359 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6360 /* Let's hope the address of the unnamed parm
6361 won't depend on its type. */
6362 TREE_TYPE (dummy) = integer_type_node;
6363 DECL_ARG_TYPE (dummy) = integer_type_node;
6364 DECL_ARGUMENTS (fndecl)
6365 = chainon (DECL_ARGUMENTS (fndecl), dummy);
6369 /* Now pushdecl the enum constants. */
6370 for (parm = others; parm; parm = next)
6372 next = TREE_CHAIN (parm);
6373 if (DECL_NAME (parm) == 0)
6375 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6377 else if (TREE_CODE (parm) != PARM_DECL)
6381 storetags (chainon (parmtags, gettags ()));
6385 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6386 each with a parm name as the TREE_VALUE.
6388 PARMDECLS is a chain of declarations for parameters.
6389 Warning! It can also contain CONST_DECLs which are not parameters
6390 but are names of enumerators of any enum types
6391 declared among the parameters.
6393 First match each formal parameter name with its declaration.
6394 Associate decls with the names and store the decls
6395 into the TREE_PURPOSE slots. */
6397 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6398 DECL_RESULT (parm) = 0;
6400 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6402 register tree tail, found = NULL;
6404 if (TREE_VALUE (parm) == 0)
6406 error_with_decl (fndecl, "parameter name missing from parameter list");
6407 TREE_PURPOSE (parm) = 0;
6411 /* See if any of the parmdecls specifies this parm by name.
6412 Ignore any enumerator decls. */
6413 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6414 if (DECL_NAME (tail) == TREE_VALUE (parm)
6415 && TREE_CODE (tail) == PARM_DECL)
6421 /* If declaration already marked, we have a duplicate name.
6422 Complain, and don't use this decl twice. */
6423 if (found && DECL_RESULT (found) != 0)
6425 error_with_decl (found, "multiple parameters named `%s'");
6429 /* If the declaration says "void", complain and ignore it. */
6430 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6432 error_with_decl (found, "parameter `%s' declared void");
6433 TREE_TYPE (found) = integer_type_node;
6434 DECL_ARG_TYPE (found) = integer_type_node;
6435 layout_decl (found, 0);
6438 /* Traditionally, a parm declared float is actually a double. */
6439 if (found && flag_traditional
6440 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6442 TREE_TYPE (found) = double_type_node;
6443 DECL_ARG_TYPE (found) = double_type_node;
6444 layout_decl (found, 0);
6447 /* If no declaration found, default to int. */
6450 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6452 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6453 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6454 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6456 warning_with_decl (found, "type of `%s' defaults to `int'");
6460 TREE_PURPOSE (parm) = found;
6462 /* Mark this decl as "already found" -- see test, above.
6463 It is safe to use DECL_RESULT for this
6464 since it is not used in PARM_DECLs or CONST_DECLs. */
6465 DECL_RESULT (found) = error_mark_node;
6468 /* Put anything which is on the parmdecls chain and which is
6469 not a PARM_DECL onto the list NONPARMS. (The types of
6470 non-parm things which might appear on the list include
6471 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6472 any actual PARM_DECLs not matched with any names. */
6475 for (parm = parmdecls; parm; )
6477 tree next = TREE_CHAIN (parm);
6478 TREE_CHAIN (parm) = 0;
6480 if (TREE_CODE (parm) != PARM_DECL)
6481 nonparms = chainon (nonparms, parm);
6484 /* Complain about args with incomplete types. */
6485 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6487 error_with_decl (parm, "parameter `%s' has incomplete type");
6488 TREE_TYPE (parm) = error_mark_node;
6491 if (DECL_RESULT (parm) == 0)
6493 error_with_decl (parm,
6494 "declaration for parameter `%s' but no such parameter");
6495 /* Pretend the parameter was not missing.
6496 This gets us to a standard state and minimizes
6497 further error messages. */
6499 = chainon (specparms,
6500 tree_cons (parm, NULL_TREE, NULL_TREE));
6507 /* Chain the declarations together in the order of the list of names. */
6508 /* Store that chain in the function decl, replacing the list of names. */
6510 DECL_ARGUMENTS (fndecl) = 0;
6513 for (last = 0; parm; parm = TREE_CHAIN (parm))
6514 if (TREE_PURPOSE (parm))
6517 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6519 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6520 last = TREE_PURPOSE (parm);
6521 TREE_CHAIN (last) = 0;
6525 /* If there was a previous prototype,
6526 set the DECL_ARG_TYPE of each argument according to
6527 the type previously specified, and report any mismatches. */
6529 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6532 for (parm = DECL_ARGUMENTS (fndecl),
6533 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6534 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6535 != void_type_node));
6536 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6538 if (parm == 0 || type == 0
6539 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6541 error ("number of arguments doesn't match prototype");
6542 error_with_file_and_line (current_function_prototype_file,
6543 current_function_prototype_line,
6544 "prototype declaration");
6547 /* Type for passing arg must be consistent
6548 with that declared for the arg. */
6549 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
6551 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6552 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6554 /* Adjust argument to match prototype. E.g. a previous
6555 `int foo(float);' prototype causes
6556 `int foo(x) float x; {...}' to be treated like
6557 `int foo(float x) {...}'. This is particularly
6558 useful for argument types like uid_t. */
6559 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6560 #ifdef PROMOTE_PROTOTYPES
6561 if ((TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
6562 || TREE_CODE (TREE_TYPE (parm)) == ENUMERAL_TYPE)
6563 && TYPE_PRECISION (TREE_TYPE (parm))
6564 < TYPE_PRECISION (integer_type_node))
6565 DECL_ARG_TYPE (parm) = integer_type_node;
6569 pedwarn ("promoted argument `%s' doesn't match prototype",
6570 IDENTIFIER_POINTER (DECL_NAME (parm)));
6571 warning_with_file_and_line
6572 (current_function_prototype_file,
6573 current_function_prototype_line,
6574 "prototype declaration");
6577 /* If -traditional, allow `int' argument to match
6578 `unsigned' prototype. */
6579 else if (! (flag_traditional
6580 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6581 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6583 error ("argument `%s' doesn't match prototype",
6584 IDENTIFIER_POINTER (DECL_NAME (parm)));
6585 error_with_file_and_line (current_function_prototype_file,
6586 current_function_prototype_line,
6587 "prototype declaration");
6591 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6594 /* Otherwise, create a prototype that would match. */
6598 tree actual = 0, last = 0, type;
6600 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6602 type = perm_tree_cons (NULL_TREE, DECL_ARG_TYPE (parm),
6605 TREE_CHAIN (last) = type;
6610 type = perm_tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6612 TREE_CHAIN (last) = type;
6616 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6617 of the type of this function, but we need to avoid having this
6618 affect the types of other similarly-typed functions, so we must
6619 first force the generation of an identical (but separate) type
6620 node for the relevant function type. The new node we create
6621 will be a variant of the main variant of the original function
6624 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6626 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6629 /* Now store the final chain of decls for the arguments
6630 as the decl-chain of the current lexical scope.
6631 Put the enumerators in as well, at the front so that
6632 DECL_ARGUMENTS is not modified. */
6634 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6637 /* Make sure the binding level for the top of the function body
6638 gets a BLOCK if there are any in the function.
6639 Otherwise, the dbx output is wrong. */
6641 keep_next_if_subblocks = 1;
6643 /* ??? This might be an improvement,
6644 but needs to be thought about some more. */
6646 keep_next_level_flag = 1;
6649 /* Write a record describing this function definition to the prototypes
6650 file (if requested). */
6652 gen_aux_info_record (fndecl, 1, 0, prototype);
6654 /* Initialize the RTL code for the function. */
6656 init_function_start (fndecl, input_filename, lineno);
6658 /* If this is a varargs function, inform function.c. */
6660 if (c_function_varargs)
6663 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
6665 declare_function_name ();
6667 /* Set up parameters and prepare for return, for the function. */
6669 expand_function_start (fndecl, 0);
6671 /* If this function is `main', emit a call to `__main'
6672 to run global initializers, etc. */
6673 if (DECL_NAME (fndecl)
6674 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main") == 0
6675 && DECL_CONTEXT (fndecl) == NULL_TREE)
6676 expand_main_function ();
6679 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6680 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6681 stands for an ellipsis in the identifier list.
6683 PARMLIST is the data returned by get_parm_info for the
6684 parmlist that follows the semicolon.
6686 We return a value of the same sort that get_parm_info returns,
6687 except that it describes the combination of identifiers and parmlist. */
6690 combine_parm_decls (specparms, parmlist, void_at_end)
6691 tree specparms, parmlist;
6694 register tree fndecl = current_function_decl;
6697 tree parmdecls = TREE_PURPOSE (parmlist);
6699 /* This is a chain of any other decls that came in among the parm
6700 declarations. They were separated already by get_parm_info,
6701 so we just need to keep them separate. */
6702 tree nonparms = TREE_VALUE (parmlist);
6706 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6707 DECL_RESULT (parm) = 0;
6709 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6711 register tree tail, found = NULL;
6713 /* See if any of the parmdecls specifies this parm by name. */
6714 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6715 if (DECL_NAME (tail) == TREE_VALUE (parm))
6721 /* If declaration already marked, we have a duplicate name.
6722 Complain, and don't use this decl twice. */
6723 if (found && DECL_RESULT (found) != 0)
6725 error_with_decl (found, "multiple parameters named `%s'");
6729 /* If the declaration says "void", complain and ignore it. */
6730 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6732 error_with_decl (found, "parameter `%s' declared void");
6733 TREE_TYPE (found) = integer_type_node;
6734 DECL_ARG_TYPE (found) = integer_type_node;
6735 layout_decl (found, 0);
6738 /* Traditionally, a parm declared float is actually a double. */
6739 if (found && flag_traditional
6740 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6742 TREE_TYPE (found) = double_type_node;
6743 DECL_ARG_TYPE (found) = double_type_node;
6744 layout_decl (found, 0);
6747 /* If no declaration found, default to int. */
6750 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6752 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6753 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6754 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6755 error_with_decl (found, "type of parameter `%s' is not declared");
6759 TREE_PURPOSE (parm) = found;
6761 /* Mark this decl as "already found" -- see test, above.
6762 It is safe to use DECL_RESULT for this
6763 since it is not used in PARM_DECLs or CONST_DECLs. */
6764 DECL_RESULT (found) = error_mark_node;
6767 /* Complain about any actual PARM_DECLs not matched with any names. */
6769 for (parm = parmdecls; parm; )
6771 tree next = TREE_CHAIN (parm);
6772 TREE_CHAIN (parm) = 0;
6774 /* Complain about args with incomplete types. */
6775 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6777 error_with_decl (parm, "parameter `%s' has incomplete type");
6778 TREE_TYPE (parm) = error_mark_node;
6781 if (DECL_RESULT (parm) == 0)
6783 error_with_decl (parm,
6784 "declaration for parameter `%s' but no such parameter");
6785 /* Pretend the parameter was not missing.
6786 This gets us to a standard state and minimizes
6787 further error messages. */
6789 = chainon (specparms,
6790 tree_cons (parm, NULL_TREE, NULL_TREE));
6796 /* Chain the declarations together in the order of the list of names.
6797 At the same time, build up a list of their types, in reverse order. */
6803 for (last = 0; parm; parm = TREE_CHAIN (parm))
6804 if (TREE_PURPOSE (parm))
6807 parmdecls = TREE_PURPOSE (parm);
6809 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6810 last = TREE_PURPOSE (parm);
6811 TREE_CHAIN (last) = 0;
6813 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (parm), types);
6818 return saveable_tree_cons (parmdecls, nonparms,
6819 nreverse (saveable_tree_cons (NULL_TREE,
6823 return saveable_tree_cons (parmdecls, nonparms, nreverse (types));
6826 /* Finish up a function declaration and compile that function
6827 all the way to assembler language output. The free the storage
6828 for the function definition.
6830 This is called after parsing the body of the function definition.
6832 NESTED is nonzero if the function being finished is nested in another. */
6835 finish_function (nested)
6838 register tree fndecl = current_function_decl;
6840 /* TREE_READONLY (fndecl) = 1;
6841 This caused &foo to be of type ptr-to-const-function
6842 which then got a warning when stored in a ptr-to-function variable. */
6845 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6847 /* Must mark the RESULT_DECL as being in this function. */
6849 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6851 /* Obey `register' declarations if `setjmp' is called in this fn. */
6852 if (flag_traditional && current_function_calls_setjmp)
6854 setjmp_protect (DECL_INITIAL (fndecl));
6855 setjmp_protect_args ();
6858 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main"))
6860 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6861 != integer_type_node)
6863 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6864 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6866 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
6870 #ifdef DEFAULT_MAIN_RETURN
6871 /* Make it so that `main' always returns success by default. */
6872 DEFAULT_MAIN_RETURN;
6877 /* Generate rtl for function exit. */
6878 expand_function_end (input_filename, lineno, 0);
6880 /* So we can tell if jump_optimize sets it to 1. */
6883 /* Run the optimizers and output the assembler code for this function. */
6884 rest_of_compilation (fndecl);
6886 current_function_returns_null |= can_reach_end;
6888 if (warn_missing_noreturn
6889 && !TREE_THIS_VOLATILE (fndecl)
6890 && !current_function_returns_null
6891 && !current_function_returns_value)
6892 warning ("function might be possible candidate for attribute `noreturn'");
6894 if (TREE_THIS_VOLATILE (fndecl) && current_function_returns_null)
6895 warning ("`noreturn' function does return");
6896 else if (warn_return_type && can_reach_end
6897 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) != void_type_node)
6898 /* If this function returns non-void and control can drop through,
6900 warning ("control reaches end of non-void function");
6901 /* With just -W, complain only if function returns both with
6902 and without a value. */
6903 else if (extra_warnings
6904 && current_function_returns_value && current_function_returns_null)
6905 warning ("this function may return with or without a value");
6907 /* If requested, warn about function definitions where the function will
6908 return a value (usually of some struct or union type) which itself will
6909 take up a lot of stack space. */
6911 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6913 register tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6917 register tree ret_type_size = TYPE_SIZE (ret_type);
6919 if (TREE_CODE (ret_type_size) == INTEGER_CST)
6922 = TREE_INT_CST_LOW (ret_type_size) / BITS_PER_UNIT;
6924 if (units > larger_than_size)
6925 warning_with_decl (fndecl,
6926 "size of return value of `%s' is %u bytes",
6932 /* Free all the tree nodes making up this function. */
6933 /* Switch back to allocating nodes permanently
6934 until we start another function. */
6936 permanent_allocation (1);
6938 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested)
6940 /* Stop pointing to the local nodes about to be freed. */
6941 /* But DECL_INITIAL must remain nonzero so we know this
6942 was an actual function definition. */
6943 /* For a nested function, this is done in pop_c_function_context. */
6944 /* If rest_of_compilation set this to 0, leave it 0. */
6945 if (DECL_INITIAL (fndecl) != 0)
6946 DECL_INITIAL (fndecl) = error_mark_node;
6947 DECL_ARGUMENTS (fndecl) = 0;
6950 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6952 #ifndef ASM_OUTPUT_CONSTRUCTOR
6953 if (! flag_gnu_linker)
6954 static_ctors = perm_tree_cons (NULL_TREE, fndecl, static_ctors);
6957 assemble_constructor (IDENTIFIER_POINTER (DECL_NAME (fndecl)));
6959 if (DECL_STATIC_DESTRUCTOR (fndecl))
6961 #ifndef ASM_OUTPUT_DESTRUCTOR
6962 if (! flag_gnu_linker)
6963 static_dtors = perm_tree_cons (NULL_TREE, fndecl, static_dtors);
6966 assemble_destructor (IDENTIFIER_POINTER (DECL_NAME (fndecl)));
6971 /* Let the error reporting routines know that we're outside a
6972 function. For a nested function, this value is used in
6973 pop_c_function_context and then reset via pop_function_context. */
6974 current_function_decl = NULL;
6978 /* Save and restore the variables in this file and elsewhere
6979 that keep track of the progress of compilation of the current function.
6980 Used for nested functions. */
6984 struct c_function *next;
6986 tree shadowed_labels;
6989 int warn_about_return_type;
6991 struct binding_level *binding_level;
6994 struct c_function *c_function_chain;
6996 /* Save and reinitialize the variables
6997 used during compilation of a C function. */
7000 push_c_function_context ()
7002 struct c_function *p
7003 = (struct c_function *) xmalloc (sizeof (struct c_function));
7006 pedwarn ("ANSI C forbids nested functions");
7008 push_function_context ();
7010 p->next = c_function_chain;
7011 c_function_chain = p;
7013 p->named_labels = named_labels;
7014 p->shadowed_labels = shadowed_labels;
7015 p->returns_value = current_function_returns_value;
7016 p->returns_null = current_function_returns_null;
7017 p->warn_about_return_type = warn_about_return_type;
7018 p->extern_inline = current_extern_inline;
7019 p->binding_level = current_binding_level;
7022 /* Restore the variables used during compilation of a C function. */
7025 pop_c_function_context ()
7027 struct c_function *p = c_function_chain;
7030 /* Bring back all the labels that were shadowed. */
7031 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
7032 if (DECL_NAME (TREE_VALUE (link)) != 0)
7033 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
7034 = TREE_VALUE (link);
7036 if (DECL_SAVED_INSNS (current_function_decl) == 0)
7038 /* Stop pointing to the local nodes about to be freed. */
7039 /* But DECL_INITIAL must remain nonzero so we know this
7040 was an actual function definition. */
7041 DECL_INITIAL (current_function_decl) = error_mark_node;
7042 DECL_ARGUMENTS (current_function_decl) = 0;
7045 pop_function_context ();
7047 c_function_chain = p->next;
7049 named_labels = p->named_labels;
7050 shadowed_labels = p->shadowed_labels;
7051 current_function_returns_value = p->returns_value;
7052 current_function_returns_null = p->returns_null;
7053 warn_about_return_type = p->warn_about_return_type;
7054 current_extern_inline = p->extern_inline;
7055 current_binding_level = p->binding_level;
7060 /* integrate_decl_tree calls this function, but since we don't use the
7061 DECL_LANG_SPECIFIC field, this is a no-op. */
7064 copy_lang_decl (node)
7065 tree node ATTRIBUTE_UNUSED;