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 /* Two expressions that are constants with value zero.
123 The first is of type `int', the second of type `void *'. */
125 tree integer_zero_node;
126 tree null_pointer_node;
128 /* A node for the integer constant 1. */
130 tree integer_one_node;
132 /* Nonzero if we have seen an invalid cross reference
133 to a struct, union, or enum, but not yet printed the message. */
135 tree pending_invalid_xref;
136 /* File and line to appear in the eventual error message. */
137 char *pending_invalid_xref_file;
138 int pending_invalid_xref_line;
140 /* While defining an enum type, this is 1 plus the last enumerator
141 constant value. Note that will do not have to save this or `enum_overflow'
142 around nested function definition since such a definition could only
143 occur in an enum value expression and we don't use these variables in
146 static tree enum_next_value;
148 /* Nonzero means that there was overflow computing enum_next_value. */
150 static int enum_overflow;
152 /* Parsing a function declarator leaves a list of parameter names
153 or a chain or parameter decls here. */
155 static tree last_function_parms;
157 /* Parsing a function declarator leaves here a chain of structure
158 and enum types declared in the parmlist. */
160 static tree last_function_parm_tags;
162 /* After parsing the declarator that starts a function definition,
163 `start_function' puts here the list of parameter names or chain of decls.
164 `store_parm_decls' finds it here. */
166 static tree current_function_parms;
168 /* Similar, for last_function_parm_tags. */
169 static tree current_function_parm_tags;
171 /* Similar, for the file and line that the prototype came from if this is
172 an old-style definition. */
173 static char *current_function_prototype_file;
174 static int current_function_prototype_line;
176 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
177 that have names. Here so we can clear out their names' definitions
178 at the end of the function. */
180 static tree named_labels;
182 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
184 static tree shadowed_labels;
186 /* Nonzero when store_parm_decls is called indicates a varargs function.
187 Value not meaningful after store_parm_decls. */
189 static int c_function_varargs;
191 /* The FUNCTION_DECL for the function currently being compiled,
192 or 0 if between functions. */
193 tree current_function_decl;
195 /* Set to 0 at beginning of a function definition, set to 1 if
196 a return statement that specifies a return value is seen. */
198 int current_function_returns_value;
200 /* Set to 0 at beginning of a function definition, set to 1 if
201 a return statement with no argument is seen. */
203 int current_function_returns_null;
205 /* Set to nonzero by `grokdeclarator' for a function
206 whose return type is defaulted, if warnings for this are desired. */
208 static int warn_about_return_type;
210 /* Nonzero when starting a function declared `extern inline'. */
212 static int current_extern_inline;
214 /* For each binding contour we allocate a binding_level structure
215 * which records the names defined in that contour.
218 * 1) one for each function definition,
219 * where internal declarations of the parameters appear.
220 * 2) one for each compound statement,
221 * to record its declarations.
223 * The current meaning of a name can be found by searching the levels from
224 * the current one out to the global one.
227 /* Note that the information in the `names' component of the global contour
228 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
232 /* A chain of _DECL nodes for all variables, constants, functions,
233 and typedef types. These are in the reverse of the order supplied.
237 /* A list of structure, union and enum definitions,
238 * for looking up tag names.
239 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
240 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
241 * or ENUMERAL_TYPE node.
245 /* For each level, a list of shadowed outer-level local definitions
246 to be restored when this level is popped.
247 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
248 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
251 /* For each level (except not the global one),
252 a chain of BLOCK nodes for all the levels
253 that were entered and exited one level down. */
256 /* The BLOCK node for this level, if one has been preallocated.
257 If 0, the BLOCK is allocated (if needed) when the level is popped. */
260 /* The binding level which this one is contained in (inherits from). */
261 struct binding_level *level_chain;
263 /* Nonzero for the level that holds the parameters of a function. */
266 /* Nonzero if this level "doesn't exist" for tags. */
267 char tag_transparent;
269 /* Nonzero if sublevels of this level "don't exist" for tags.
270 This is set in the parm level of a function definition
271 while reading the function body, so that the outermost block
272 of the function body will be tag-transparent. */
273 char subblocks_tag_transparent;
275 /* Nonzero means make a BLOCK for this level regardless of all else. */
278 /* Nonzero means make a BLOCK if this level has any subblocks. */
279 char keep_if_subblocks;
281 /* Number of decls in `names' that have incomplete
282 structure or union types. */
285 /* A list of decls giving the (reversed) specified order of parms,
286 not including any forward-decls in the parmlist.
287 This is so we can put the parms in proper order for assign_parms. */
291 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
293 /* The binding level currently in effect. */
295 static struct binding_level *current_binding_level;
297 /* A chain of binding_level structures awaiting reuse. */
299 static struct binding_level *free_binding_level;
301 /* The outermost binding level, for names of file scope.
302 This is created when the compiler is started and exists
303 through the entire run. */
305 static struct binding_level *global_binding_level;
307 /* Binding level structures are initialized by copying this one. */
309 static struct binding_level clear_binding_level
310 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, 0,
313 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
315 static int keep_next_level_flag;
317 /* Nonzero means make a BLOCK for the next level pushed
318 if it has subblocks. */
320 static int keep_next_if_subblocks;
322 /* The chain of outer levels of label scopes.
323 This uses the same data structure used for binding levels,
324 but it works differently: each link in the chain records
325 saved values of named_labels and shadowed_labels for
326 a label binding level outside the current one. */
328 static struct binding_level *label_level_chain;
330 /* Functions called automatically at the beginning and end of execution. */
332 tree static_ctors, static_dtors;
334 /* Forward declarations. */
336 static struct binding_level * make_binding_level PROTO((void));
337 static void clear_limbo_values PROTO((tree));
338 static int duplicate_decls PROTO((tree, tree, int));
339 static int redeclaration_error_message PROTO((tree, tree));
340 static void storedecls PROTO((tree));
341 static void storetags PROTO((tree));
342 static tree lookup_tag PROTO((enum tree_code, tree,
343 struct binding_level *, int));
344 static tree lookup_tag_reverse PROTO((tree));
345 static tree grokdeclarator PROTO((tree, tree, enum decl_context,
347 static tree grokparms PROTO((tree, int));
348 static int field_decl_cmp PROTO((const GENERIC_PTR, const GENERIC_PTR));
349 static void layout_array_type PROTO((tree));
351 /* C-specific option variables. */
353 /* Nonzero means allow type mismatches in conditional expressions;
354 just make their values `void'. */
356 int flag_cond_mismatch;
358 /* Nonzero means give `double' the same size as `float'. */
360 int flag_short_double;
362 /* Nonzero means don't recognize the keyword `asm'. */
366 /* Nonzero means don't recognize any builtin functions. */
370 /* Nonzero means don't recognize the non-ANSI builtin functions.
373 int flag_no_nonansi_builtin;
375 /* Nonzero means do some things the same way PCC does. */
377 int flag_traditional;
379 /* Nonzero means use the ISO C9x dialect of C. */
383 /* Nonzero means that we have builtin functions, and main is an int */
387 /* Nonzero means to allow single precision math even if we're generally
388 being traditional. */
389 int flag_allow_single_precision = 0;
391 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
393 int flag_signed_bitfields = 1;
394 int explicit_flag_signed_bitfields = 0;
396 /* Nonzero means warn about use of implicit int. */
398 int warn_implicit_int;
400 /* Nonzero means warn about usage of long long when `-pedantic'. */
402 int warn_long_long = 1;
404 /* Nonzero means message about use of implicit function declarations;
405 1 means warning; 2 means error. */
407 int mesg_implicit_function_declaration;
409 /* Nonzero means give string constants the type `const char *'
410 to get extra warnings from them. These warnings will be too numerous
411 to be useful, except in thoroughly ANSIfied programs. */
413 int flag_const_strings;
415 /* Nonzero means warn about pointer casts that can drop a type qualifier
416 from the pointer target type. */
420 /* Nonzero means warn when casting a function call to a type that does
421 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
422 when there is no previous declaration of sqrt or malloc. */
424 int warn_bad_function_cast;
426 /* Warn about functions which might be candidates for attribute noreturn. */
428 int warn_missing_noreturn;
430 /* Warn about traditional constructs whose meanings changed in ANSI C. */
432 int warn_traditional;
434 /* Nonzero means warn about sizeof(function) or addition/subtraction
435 of function pointers. */
437 int warn_pointer_arith;
439 /* Nonzero means warn for non-prototype function decls
440 or non-prototyped defs without previous prototype. */
442 int warn_strict_prototypes;
444 /* Nonzero means warn for any global function def
445 without separate previous prototype decl. */
447 int warn_missing_prototypes;
449 /* Nonzero means warn for any global function def
450 without separate previous decl. */
452 int warn_missing_declarations;
454 /* Nonzero means warn about multiple (redundant) decls for the same single
455 variable or function. */
457 int warn_redundant_decls = 0;
459 /* Nonzero means warn about extern declarations of objects not at
460 file-scope level and about *all* declarations of functions (whether
461 extern or static) not at file-scope level. Note that we exclude
462 implicit function declarations. To get warnings about those, use
465 int warn_nested_externs = 0;
467 /* Warn about *printf or *scanf format/argument anomalies. */
471 /* Warn about a subscript that has type char. */
473 int warn_char_subscripts = 0;
475 /* Warn if a type conversion is done that might have confusing results. */
479 /* Warn if adding () is suggested. */
481 int warn_parentheses;
483 /* Warn if initializer is not completely bracketed. */
485 int warn_missing_braces;
487 /* Warn if main is suspicious. */
491 /* Warn about #pragma directives that are not recognised. */
493 int warn_unknown_pragmas = 0; /* Tri state variable. */
495 /* Warn about comparison of signed and unsigned values.
496 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
498 int warn_sign_compare = -1;
500 /* Nonzero means warn about use of multicharacter literals. */
502 int warn_multichar = 1;
504 /* Nonzero means `$' can be in an identifier. */
506 #ifndef DOLLARS_IN_IDENTIFIERS
507 #define DOLLARS_IN_IDENTIFIERS 1
509 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
511 /* Decode the string P as a language-specific option for C.
512 Return the number of strings consumed. */
515 c_decode_option (argc, argv)
516 int argc ATTRIBUTE_UNUSED;
519 int strings_processed;
522 strings_processed = cpp_handle_option (&parse_in, argc, argv);
524 strings_processed = 0;
525 #endif /* ! USE_CPPLIB */
527 if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
529 flag_traditional = 1;
530 flag_writable_strings = 1;
532 else if (!strcmp (p, "-fallow-single-precision"))
533 flag_allow_single_precision = 1;
534 else if (!strcmp (p, "-fhosted") || !strcmp (p, "-fno-freestanding"))
539 else if (!strcmp (p, "-ffreestanding") || !strcmp (p, "-fno-hosted"))
543 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
547 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
549 flag_traditional = 0;
550 flag_writable_strings = 0;
552 else if (!strncmp (p, "-std=", 5))
554 /* Select the appropriate language standard. We currently
556 -std=iso9899:1990 same as -ansi
557 -std=iso9899:199409 ISO C as modified in amend. 1
558 -std=iso9899:199x ISO C 9x
559 -std=c89 same as -std=iso9899:1990
560 -std=c9x same as -std=iso9899:199x
561 -std=gnu89 default, iso9899:1990 + gnu extensions
562 -std=gnu9x iso9899:199x + gnu extensions
564 const char *argstart = &p[5];
566 if (!strcmp (argstart, "iso9899:1990")
567 || !strcmp (argstart, "c89"))
570 flag_traditional = 0;
571 flag_writable_strings = 0;
573 flag_no_nonansi_builtin = 1;
576 else if (!strcmp (argstart, "iso9899:199409"))
578 /* ??? The changes since ISO C 1990 are not supported. */
581 else if (!strcmp (argstart, "iso9899:199x")
582 || !strcmp (argstart, "c9x"))
584 flag_traditional = 0;
585 flag_writable_strings = 0;
587 flag_no_nonansi_builtin = 1;
590 else if (!strcmp (argstart, "gnu89"))
592 flag_traditional = 0;
593 flag_writable_strings = 0;
595 flag_no_nonansi_builtin = 0;
598 else if (!strcmp (argstart, "gnu9x"))
600 flag_traditional = 0;
601 flag_writable_strings = 0;
603 flag_no_nonansi_builtin = 0;
607 error ("unknown C standard `%s'", argstart);
609 else if (!strcmp (p, "-fdollars-in-identifiers"))
610 dollars_in_ident = 1;
611 else if (!strcmp (p, "-fno-dollars-in-identifiers"))
612 dollars_in_ident = 0;
613 else if (!strcmp (p, "-fsigned-char"))
614 flag_signed_char = 1;
615 else if (!strcmp (p, "-funsigned-char"))
616 flag_signed_char = 0;
617 else if (!strcmp (p, "-fno-signed-char"))
618 flag_signed_char = 0;
619 else if (!strcmp (p, "-fno-unsigned-char"))
620 flag_signed_char = 1;
621 else if (!strcmp (p, "-fsigned-bitfields")
622 || !strcmp (p, "-fno-unsigned-bitfields"))
624 flag_signed_bitfields = 1;
625 explicit_flag_signed_bitfields = 1;
627 else if (!strcmp (p, "-funsigned-bitfields")
628 || !strcmp (p, "-fno-signed-bitfields"))
630 flag_signed_bitfields = 0;
631 explicit_flag_signed_bitfields = 1;
633 else if (!strcmp (p, "-fshort-enums"))
634 flag_short_enums = 1;
635 else if (!strcmp (p, "-fno-short-enums"))
636 flag_short_enums = 0;
637 else if (!strcmp (p, "-fcond-mismatch"))
638 flag_cond_mismatch = 1;
639 else if (!strcmp (p, "-fno-cond-mismatch"))
640 flag_cond_mismatch = 0;
641 else if (!strcmp (p, "-fshort-double"))
642 flag_short_double = 1;
643 else if (!strcmp (p, "-fno-short-double"))
644 flag_short_double = 0;
645 else if (!strcmp (p, "-fasm"))
647 else if (!strcmp (p, "-fno-asm"))
649 else if (!strcmp (p, "-fbuiltin"))
651 else if (!strcmp (p, "-fno-builtin"))
653 else if (!strcmp (p, "-ansi"))
655 else if (!strcmp (p, "-Werror-implicit-function-declaration"))
656 mesg_implicit_function_declaration = 2;
657 else if (!strcmp (p, "-Wimplicit-function-declaration"))
658 mesg_implicit_function_declaration = 1;
659 else if (!strcmp (p, "-Wno-implicit-function-declaration"))
660 mesg_implicit_function_declaration = 0;
661 else if (!strcmp (p, "-Wimplicit-int"))
662 warn_implicit_int = 1;
663 else if (!strcmp (p, "-Wno-implicit-int"))
664 warn_implicit_int = 0;
665 else if (!strcmp (p, "-Wimplicit"))
667 warn_implicit_int = 1;
668 if (mesg_implicit_function_declaration != 2)
669 mesg_implicit_function_declaration = 1;
671 else if (!strcmp (p, "-Wno-implicit"))
672 warn_implicit_int = 0, mesg_implicit_function_declaration = 0;
673 else if (!strcmp (p, "-Wlong-long"))
675 else if (!strcmp (p, "-Wno-long-long"))
677 else if (!strcmp (p, "-Wwrite-strings"))
678 flag_const_strings = 1;
679 else if (!strcmp (p, "-Wno-write-strings"))
680 flag_const_strings = 0;
681 else if (!strcmp (p, "-Wcast-qual"))
683 else if (!strcmp (p, "-Wno-cast-qual"))
685 else if (!strcmp (p, "-Wbad-function-cast"))
686 warn_bad_function_cast = 1;
687 else if (!strcmp (p, "-Wno-bad-function-cast"))
688 warn_bad_function_cast = 0;
689 else if (!strcmp (p, "-Wmissing-noreturn"))
690 warn_missing_noreturn = 1;
691 else if (!strcmp (p, "-Wno-missing-noreturn"))
692 warn_missing_noreturn = 0;
693 else if (!strcmp (p, "-Wpointer-arith"))
694 warn_pointer_arith = 1;
695 else if (!strcmp (p, "-Wno-pointer-arith"))
696 warn_pointer_arith = 0;
697 else if (!strcmp (p, "-Wstrict-prototypes"))
698 warn_strict_prototypes = 1;
699 else if (!strcmp (p, "-Wno-strict-prototypes"))
700 warn_strict_prototypes = 0;
701 else if (!strcmp (p, "-Wmissing-prototypes"))
702 warn_missing_prototypes = 1;
703 else if (!strcmp (p, "-Wno-missing-prototypes"))
704 warn_missing_prototypes = 0;
705 else if (!strcmp (p, "-Wmissing-declarations"))
706 warn_missing_declarations = 1;
707 else if (!strcmp (p, "-Wno-missing-declarations"))
708 warn_missing_declarations = 0;
709 else if (!strcmp (p, "-Wredundant-decls"))
710 warn_redundant_decls = 1;
711 else if (!strcmp (p, "-Wno-redundant-decls"))
712 warn_redundant_decls = 0;
713 else if (!strcmp (p, "-Wnested-externs"))
714 warn_nested_externs = 1;
715 else if (!strcmp (p, "-Wno-nested-externs"))
716 warn_nested_externs = 0;
717 else if (!strcmp (p, "-Wtraditional"))
718 warn_traditional = 1;
719 else if (!strcmp (p, "-Wno-traditional"))
720 warn_traditional = 0;
721 else if (!strcmp (p, "-Wformat"))
723 else if (!strcmp (p, "-Wno-format"))
725 else if (!strcmp (p, "-Wchar-subscripts"))
726 warn_char_subscripts = 1;
727 else if (!strcmp (p, "-Wno-char-subscripts"))
728 warn_char_subscripts = 0;
729 else if (!strcmp (p, "-Wconversion"))
731 else if (!strcmp (p, "-Wno-conversion"))
733 else if (!strcmp (p, "-Wparentheses"))
734 warn_parentheses = 1;
735 else if (!strcmp (p, "-Wno-parentheses"))
736 warn_parentheses = 0;
737 else if (!strcmp (p, "-Wreturn-type"))
738 warn_return_type = 1;
739 else if (!strcmp (p, "-Wno-return-type"))
740 warn_return_type = 0;
741 else if (!strcmp (p, "-Wcomment"))
742 ; /* cpp handles this one. */
743 else if (!strcmp (p, "-Wno-comment"))
744 ; /* cpp handles this one. */
745 else if (!strcmp (p, "-Wcomments"))
746 ; /* cpp handles this one. */
747 else if (!strcmp (p, "-Wno-comments"))
748 ; /* cpp handles this one. */
749 else if (!strcmp (p, "-Wtrigraphs"))
750 ; /* cpp handles this one. */
751 else if (!strcmp (p, "-Wno-trigraphs"))
752 ; /* cpp handles this one. */
753 else if (!strcmp (p, "-Wundef"))
754 ; /* cpp handles this one. */
755 else if (!strcmp (p, "-Wno-undef"))
756 ; /* cpp handles this one. */
757 else if (!strcmp (p, "-Wimport"))
758 ; /* cpp handles this one. */
759 else if (!strcmp (p, "-Wno-import"))
760 ; /* cpp handles this one. */
761 else if (!strcmp (p, "-Wmissing-braces"))
762 warn_missing_braces = 1;
763 else if (!strcmp (p, "-Wno-missing-braces"))
764 warn_missing_braces = 0;
765 else if (!strcmp (p, "-Wmain"))
767 else if (!strcmp (p, "-Wno-main"))
769 else if (!strcmp (p, "-Wsign-compare"))
770 warn_sign_compare = 1;
771 else if (!strcmp (p, "-Wno-sign-compare"))
772 warn_sign_compare = 0;
773 else if (!strcmp (p, "-Wmultichar"))
775 else if (!strcmp (p, "-Wno-multichar"))
777 else if (!strcmp (p, "-Wunknown-pragmas"))
778 /* Set to greater than 1, so that even unknown pragmas in system
779 headers will be warned about. */
780 warn_unknown_pragmas = 2;
781 else if (!strcmp (p, "-Wno-unknown-pragmas"))
782 warn_unknown_pragmas = 0;
783 else if (!strcmp (p, "-Wall"))
785 /* We save the value of warn_uninitialized, since if they put
786 -Wuninitialized on the command line, we need to generate a
787 warning about not using it without also specifying -O. */
788 if (warn_uninitialized != 1)
789 warn_uninitialized = 2;
790 warn_implicit_int = 1;
791 mesg_implicit_function_declaration = 1;
792 warn_return_type = 1;
796 warn_char_subscripts = 1;
797 warn_parentheses = 1;
798 warn_missing_braces = 1;
799 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
800 it off only if it's not explicit. */
802 /* Only warn about unknown pragmas that are not in system headers. */
803 warn_unknown_pragmas = 1;
806 return strings_processed;
811 /* Hooks for print_node. */
814 print_lang_decl (file, node, indent)
815 FILE *file ATTRIBUTE_UNUSED;
816 tree node ATTRIBUTE_UNUSED;
817 int indent ATTRIBUTE_UNUSED;
822 print_lang_type (file, node, indent)
823 FILE *file ATTRIBUTE_UNUSED;
824 tree node ATTRIBUTE_UNUSED;
825 int indent ATTRIBUTE_UNUSED;
830 print_lang_identifier (file, node, indent)
835 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
836 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
837 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
838 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
839 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
840 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
843 /* Hook called at end of compilation to assume 1 elt
844 for a top-level array decl that wasn't complete before. */
847 finish_incomplete_decl (decl)
850 if (TREE_CODE (decl) == VAR_DECL)
852 tree type = TREE_TYPE (decl);
853 if (type != error_mark_node
854 && TREE_CODE (type) == ARRAY_TYPE
855 && TYPE_DOMAIN (type) == 0)
857 if (! DECL_EXTERNAL (decl))
858 warning_with_decl (decl, "array `%s' assumed to have one element");
860 complete_array_type (type, NULL_TREE, 1);
862 layout_decl (decl, 0);
867 /* Create a new `struct binding_level'. */
870 struct binding_level *
871 make_binding_level ()
874 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
877 /* Nonzero if we are currently in the global binding level. */
882 return current_binding_level == global_binding_level;
888 keep_next_level_flag = 1;
891 /* Nonzero if the current level needs to have a BLOCK made. */
896 return ((current_binding_level->keep_if_subblocks
897 && current_binding_level->blocks != 0)
898 || current_binding_level->keep
899 || current_binding_level->names != 0
900 || (current_binding_level->tags != 0
901 && !current_binding_level->tag_transparent));
904 /* Identify this binding level as a level of parameters.
905 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
906 But it turns out there is no way to pass the right value for
907 DEFINITION_FLAG, so we ignore it. */
910 declare_parm_level (definition_flag)
911 int definition_flag ATTRIBUTE_UNUSED;
913 current_binding_level->parm_flag = 1;
916 /* Nonzero if currently making parm declarations. */
921 return current_binding_level->parm_flag;
924 /* Enter a new binding level.
925 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
926 not for that of tags. */
929 pushlevel (tag_transparent)
932 register struct binding_level *newlevel = NULL_BINDING_LEVEL;
934 /* If this is the top level of a function,
935 just make sure that NAMED_LABELS is 0. */
937 if (current_binding_level == global_binding_level)
942 /* Reuse or create a struct for this binding level. */
944 if (free_binding_level)
946 newlevel = free_binding_level;
947 free_binding_level = free_binding_level->level_chain;
951 newlevel = make_binding_level ();
954 /* Add this level to the front of the chain (stack) of levels that
957 *newlevel = clear_binding_level;
958 newlevel->tag_transparent
960 || (current_binding_level
961 ? current_binding_level->subblocks_tag_transparent
963 newlevel->level_chain = current_binding_level;
964 current_binding_level = newlevel;
965 newlevel->keep = keep_next_level_flag;
966 keep_next_level_flag = 0;
967 newlevel->keep_if_subblocks = keep_next_if_subblocks;
968 keep_next_if_subblocks = 0;
971 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
974 clear_limbo_values (block)
979 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
980 if (DECL_NAME (tem) != 0)
981 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
983 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
984 clear_limbo_values (tem);
987 /* Exit a binding level.
988 Pop the level off, and restore the state of the identifier-decl mappings
989 that were in effect when this level was entered.
991 If KEEP is nonzero, this level had explicit declarations, so
992 and create a "block" (a BLOCK node) for the level
993 to record its declarations and subblocks for symbol table output.
995 If FUNCTIONBODY is nonzero, this level is the body of a function,
996 so create a block as if KEEP were set and also clear out all
999 If REVERSE is nonzero, reverse the order of decls before putting
1000 them into the BLOCK. */
1003 poplevel (keep, reverse, functionbody)
1009 /* The chain of decls was accumulated in reverse order.
1010 Put it into forward order, just for cleanliness. */
1012 tree tags = current_binding_level->tags;
1013 tree subblocks = current_binding_level->blocks;
1016 int block_previously_created;
1018 keep |= current_binding_level->keep;
1020 /* This warning is turned off because it causes warnings for
1021 declarations like `extern struct foo *x'. */
1023 /* Warn about incomplete structure types in this level. */
1024 for (link = tags; link; link = TREE_CHAIN (link))
1025 if (TYPE_SIZE (TREE_VALUE (link)) == 0)
1027 tree type = TREE_VALUE (link);
1028 tree type_name = TYPE_NAME (type);
1029 char *id = IDENTIFIER_POINTER (TREE_CODE (type_name) == IDENTIFIER_NODE
1031 : DECL_NAME (type_name));
1032 switch (TREE_CODE (type))
1035 error ("`struct %s' incomplete in scope ending here", id);
1038 error ("`union %s' incomplete in scope ending here", id);
1041 error ("`enum %s' incomplete in scope ending here", id);
1047 /* Get the decls in the order they were written.
1048 Usually current_binding_level->names is in reverse order.
1049 But parameter decls were previously put in forward order. */
1052 current_binding_level->names
1053 = decls = nreverse (current_binding_level->names);
1055 decls = current_binding_level->names;
1057 /* Output any nested inline functions within this block
1058 if they weren't already output. */
1060 for (decl = decls; decl; decl = TREE_CHAIN (decl))
1061 if (TREE_CODE (decl) == FUNCTION_DECL
1062 && ! TREE_ASM_WRITTEN (decl)
1063 && DECL_INITIAL (decl) != 0
1064 && TREE_ADDRESSABLE (decl))
1066 /* If this decl was copied from a file-scope decl
1067 on account of a block-scope extern decl,
1068 propagate TREE_ADDRESSABLE to the file-scope decl.
1070 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1071 true, since then the decl goes through save_for_inline_copying. */
1072 if (DECL_ABSTRACT_ORIGIN (decl) != 0
1073 && DECL_ABSTRACT_ORIGIN (decl) != decl)
1074 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
1075 else if (DECL_SAVED_INSNS (decl) != 0)
1077 push_function_context ();
1078 output_inline_function (decl);
1079 pop_function_context ();
1083 /* If there were any declarations or structure tags in that level,
1084 or if this level is a function body,
1085 create a BLOCK to record them for the life of this function. */
1088 block_previously_created = (current_binding_level->this_block != 0);
1089 if (block_previously_created)
1090 block = current_binding_level->this_block;
1091 else if (keep || functionbody
1092 || (current_binding_level->keep_if_subblocks && subblocks != 0))
1093 block = make_node (BLOCK);
1096 BLOCK_VARS (block) = decls;
1097 BLOCK_TYPE_TAGS (block) = tags;
1098 BLOCK_SUBBLOCKS (block) = subblocks;
1099 remember_end_note (block);
1102 /* In each subblock, record that this is its superior. */
1104 for (link = subblocks; link; link = TREE_CHAIN (link))
1105 BLOCK_SUPERCONTEXT (link) = block;
1107 /* Clear out the meanings of the local variables of this level. */
1109 for (link = decls; link; link = TREE_CHAIN (link))
1111 if (DECL_NAME (link) != 0)
1113 /* If the ident. was used or addressed via a local extern decl,
1114 don't forget that fact. */
1115 if (DECL_EXTERNAL (link))
1117 if (TREE_USED (link))
1118 TREE_USED (DECL_NAME (link)) = 1;
1119 if (TREE_ADDRESSABLE (link))
1120 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1122 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1126 /* Restore all name-meanings of the outer levels
1127 that were shadowed by this level. */
1129 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1130 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1132 /* If the level being exited is the top level of a function,
1133 check over all the labels, and clear out the current
1134 (function local) meanings of their names. */
1138 clear_limbo_values (block);
1140 /* If this is the top level block of a function,
1141 the vars are the function's parameters.
1142 Don't leave them in the BLOCK because they are
1143 found in the FUNCTION_DECL instead. */
1145 BLOCK_VARS (block) = 0;
1147 /* Clear out the definitions of all label names,
1148 since their scopes end here,
1149 and add them to BLOCK_VARS. */
1151 for (link = named_labels; link; link = TREE_CHAIN (link))
1153 register tree label = TREE_VALUE (link);
1155 if (DECL_INITIAL (label) == 0)
1157 error_with_decl (label, "label `%s' used but not defined");
1158 /* Avoid crashing later. */
1159 define_label (input_filename, lineno,
1162 else if (warn_unused && !TREE_USED (label))
1163 warning_with_decl (label, "label `%s' defined but not used");
1164 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1166 /* Put the labels into the "variables" of the
1167 top-level block, so debugger can see them. */
1168 TREE_CHAIN (label) = BLOCK_VARS (block);
1169 BLOCK_VARS (block) = label;
1173 /* Pop the current level, and free the structure for reuse. */
1176 register struct binding_level *level = current_binding_level;
1177 current_binding_level = current_binding_level->level_chain;
1179 level->level_chain = free_binding_level;
1180 free_binding_level = level;
1183 /* Dispose of the block that we just made inside some higher level. */
1185 DECL_INITIAL (current_function_decl) = block;
1188 if (!block_previously_created)
1189 current_binding_level->blocks
1190 = chainon (current_binding_level->blocks, block);
1192 /* If we did not make a block for the level just exited,
1193 any blocks made for inner levels
1194 (since they cannot be recorded as subblocks in that level)
1195 must be carried forward so they will later become subblocks
1196 of something else. */
1198 current_binding_level->blocks
1199 = chainon (current_binding_level->blocks, subblocks);
1201 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1202 binding contour so that they point to the appropriate construct, i.e.
1203 either to the current FUNCTION_DECL node, or else to the BLOCK node
1204 we just constructed.
1206 Note that for tagged types whose scope is just the formal parameter
1207 list for some function type specification, we can't properly set
1208 their TYPE_CONTEXTs here, because we don't have a pointer to the
1209 appropriate FUNCTION_TYPE node readily available to us. For those
1210 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1211 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1212 node which will represent the "scope" for these "parameter list local"
1217 for (link = tags; link; link = TREE_CHAIN (link))
1218 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1220 for (link = tags; link; link = TREE_CHAIN (link))
1221 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1224 TREE_USED (block) = 1;
1228 /* Delete the node BLOCK from the current binding level.
1229 This is used for the block inside a stmt expr ({...})
1230 so that the block can be reinserted where appropriate. */
1233 delete_block (block)
1237 if (current_binding_level->blocks == block)
1238 current_binding_level->blocks = TREE_CHAIN (block);
1239 for (t = current_binding_level->blocks; t;)
1241 if (TREE_CHAIN (t) == block)
1242 TREE_CHAIN (t) = TREE_CHAIN (block);
1246 TREE_CHAIN (block) = NULL;
1247 /* Clear TREE_USED which is always set by poplevel.
1248 The flag is set again if insert_block is called. */
1249 TREE_USED (block) = 0;
1252 /* Insert BLOCK at the end of the list of subblocks of the
1253 current binding level. This is used when a BIND_EXPR is expanded,
1254 to handle the BLOCK node inside the BIND_EXPR. */
1257 insert_block (block)
1260 TREE_USED (block) = 1;
1261 current_binding_level->blocks
1262 = chainon (current_binding_level->blocks, block);
1265 /* Set the BLOCK node for the innermost scope
1266 (the one we are currently in). */
1270 register tree block;
1272 current_binding_level->this_block = block;
1278 register struct binding_level *newlevel;
1280 /* Reuse or create a struct for this binding level. */
1282 if (free_binding_level)
1284 newlevel = free_binding_level;
1285 free_binding_level = free_binding_level->level_chain;
1289 newlevel = make_binding_level ();
1292 /* Add this level to the front of the chain (stack) of label levels. */
1294 newlevel->level_chain = label_level_chain;
1295 label_level_chain = newlevel;
1297 newlevel->names = named_labels;
1298 newlevel->shadowed = shadowed_labels;
1300 shadowed_labels = 0;
1306 register struct binding_level *level = label_level_chain;
1309 /* Clear out the definitions of the declared labels in this level.
1310 Leave in the list any ordinary, non-declared labels. */
1311 for (link = named_labels, prev = 0; link;)
1313 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1315 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1317 error_with_decl (TREE_VALUE (link),
1318 "label `%s' used but not defined");
1319 /* Avoid crashing later. */
1320 define_label (input_filename, lineno,
1321 DECL_NAME (TREE_VALUE (link)));
1323 else if (warn_unused && !TREE_USED (TREE_VALUE (link)))
1324 warning_with_decl (TREE_VALUE (link),
1325 "label `%s' defined but not used");
1326 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1328 /* Delete this element from the list. */
1329 link = TREE_CHAIN (link);
1331 TREE_CHAIN (prev) = link;
1333 named_labels = link;
1338 link = TREE_CHAIN (link);
1342 /* Bring back all the labels that were shadowed. */
1343 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1344 if (DECL_NAME (TREE_VALUE (link)) != 0)
1345 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1346 = TREE_VALUE (link);
1348 named_labels = chainon (named_labels, level->names);
1349 shadowed_labels = level->shadowed;
1351 /* Pop the current level, and free the structure for reuse. */
1352 label_level_chain = label_level_chain->level_chain;
1353 level->level_chain = free_binding_level;
1354 free_binding_level = level;
1357 /* Push a definition or a declaration of struct, union or enum tag "name".
1358 "type" should be the type node.
1359 We assume that the tag "name" is not already defined.
1361 Note that the definition may really be just a forward reference.
1362 In that case, the TYPE_SIZE will be zero. */
1365 pushtag (name, type)
1368 register struct binding_level *b;
1370 /* Find the proper binding level for this type tag. */
1372 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1377 /* Record the identifier as the type's name if it has none. */
1379 if (TYPE_NAME (type) == 0)
1380 TYPE_NAME (type) = name;
1383 if (b == global_binding_level)
1384 b->tags = perm_tree_cons (name, type, b->tags);
1386 b->tags = saveable_tree_cons (name, type, b->tags);
1388 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1389 tagged type we just added to the current binding level. This fake
1390 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1391 to output a representation of a tagged type, and it also gives
1392 us a convenient place to record the "scope start" address for the
1395 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1397 /* An approximation for now, so we can tell this is a function-scope tag.
1398 This will be updated in poplevel. */
1399 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1402 /* Handle when a new declaration NEWDECL
1403 has the same name as an old one OLDDECL
1404 in the same binding contour.
1405 Prints an error message if appropriate.
1407 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1408 Otherwise, return 0.
1410 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1411 and OLDDECL is in an outer binding level and should thus not be changed. */
1414 duplicate_decls (newdecl, olddecl, different_binding_level)
1415 register tree newdecl, olddecl;
1416 int different_binding_level;
1418 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1419 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1420 && DECL_INITIAL (newdecl) != 0);
1421 tree oldtype = TREE_TYPE (olddecl);
1422 tree newtype = TREE_TYPE (newdecl);
1425 if (TREE_CODE_CLASS (TREE_CODE (olddecl)) == 'd')
1426 DECL_MACHINE_ATTRIBUTES (newdecl)
1427 = merge_machine_decl_attributes (olddecl, newdecl);
1429 if (TREE_CODE (newtype) == ERROR_MARK
1430 || TREE_CODE (oldtype) == ERROR_MARK)
1433 /* New decl is completely inconsistent with the old one =>
1434 tell caller to replace the old one.
1435 This is always an error except in the case of shadowing a builtin. */
1436 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1438 if (TREE_CODE (olddecl) == FUNCTION_DECL
1439 && (DECL_BUILT_IN (olddecl)
1440 || DECL_BUILT_IN_NONANSI (olddecl)))
1442 /* If you declare a built-in or predefined function name as static,
1443 the old definition is overridden,
1444 but optionally warn this was a bad choice of name. */
1445 if (!TREE_PUBLIC (newdecl))
1449 else if (DECL_BUILT_IN (olddecl))
1450 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1452 warning_with_decl (newdecl, "shadowing library function `%s'");
1454 /* Likewise, if the built-in is not ansi, then programs can
1455 override it even globally without an error. */
1456 else if (! DECL_BUILT_IN (olddecl))
1457 warning_with_decl (newdecl,
1458 "library function `%s' declared as non-function");
1460 else if (DECL_BUILT_IN_NONANSI (olddecl))
1461 warning_with_decl (newdecl,
1462 "built-in function `%s' declared as non-function");
1464 warning_with_decl (newdecl,
1465 "built-in function `%s' declared as non-function");
1469 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1470 error_with_decl (olddecl, "previous declaration of `%s'");
1476 /* For real parm decl following a forward decl,
1477 return 1 so old decl will be reused. */
1478 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1479 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1482 /* The new declaration is the same kind of object as the old one.
1483 The declarations may partially match. Print warnings if they don't
1484 match enough. Ultimately, copy most of the information from the new
1485 decl to the old one, and keep using the old one. */
1487 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1488 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1489 && DECL_INITIAL (olddecl) == 0)
1490 /* If -traditional, avoid error for redeclaring fcn
1491 after implicit decl. */
1493 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1494 && DECL_BUILT_IN (olddecl))
1496 /* A function declaration for a built-in function. */
1497 if (!TREE_PUBLIC (newdecl))
1499 /* If you declare a built-in function name as static, the
1500 built-in definition is overridden,
1501 but optionally warn this was a bad choice of name. */
1503 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1504 /* Discard the old built-in function. */
1507 else if (!types_match)
1509 /* Accept the return type of the new declaration if same modes. */
1510 tree oldreturntype = TREE_TYPE (oldtype);
1511 tree newreturntype = TREE_TYPE (newtype);
1513 /* Make sure we put the new type in the same obstack as the old ones.
1514 If the old types are not both in the same obstack, use the
1516 if (TYPE_OBSTACK (oldtype) == TYPE_OBSTACK (newtype))
1517 push_obstacks (TYPE_OBSTACK (oldtype), TYPE_OBSTACK (oldtype));
1520 push_obstacks_nochange ();
1521 end_temporary_allocation ();
1524 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1526 /* Function types may be shared, so we can't just modify
1527 the return type of olddecl's function type. */
1529 = build_function_type (newreturntype,
1530 TYPE_ARG_TYPES (oldtype));
1532 types_match = comptypes (newtype, trytype);
1536 /* Accept harmless mismatch in first argument type also.
1538 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1539 && TYPE_ARG_TYPES (oldtype) != 0
1540 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1541 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1542 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1543 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1545 /* Function types may be shared, so we can't just modify
1546 the return type of olddecl's function type. */
1548 = build_function_type (TREE_TYPE (oldtype),
1549 tree_cons (NULL_TREE,
1550 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1551 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1553 types_match = comptypes (newtype, trytype);
1557 if (! different_binding_level)
1558 TREE_TYPE (olddecl) = oldtype;
1564 /* If types don't match for a built-in, throw away the built-in. */
1565 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1569 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1570 && DECL_SOURCE_LINE (olddecl) == 0)
1572 /* A function declaration for a predeclared function
1573 that isn't actually built in. */
1574 if (!TREE_PUBLIC (newdecl))
1576 /* If you declare it as static, the
1577 default definition is overridden. */
1580 else if (!types_match)
1582 /* If the types don't match, preserve volatility indication.
1583 Later on, we will discard everything else about the
1584 default declaration. */
1585 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1588 /* Permit char *foo () to match void *foo (...) if not pedantic,
1589 if one of them came from a system header file. */
1590 else if (!types_match
1591 && TREE_CODE (olddecl) == FUNCTION_DECL
1592 && TREE_CODE (newdecl) == FUNCTION_DECL
1593 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1594 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1595 && (DECL_IN_SYSTEM_HEADER (olddecl)
1596 || DECL_IN_SYSTEM_HEADER (newdecl))
1597 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1598 && TYPE_ARG_TYPES (oldtype) == 0
1599 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1600 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1602 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1603 && TYPE_ARG_TYPES (newtype) == 0
1604 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1605 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1608 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1609 /* Make sure we keep void * as ret type, not char *. */
1610 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1611 TREE_TYPE (newdecl) = newtype = oldtype;
1613 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1614 we will come back here again. */
1615 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1617 else if (!types_match
1618 /* Permit char *foo (int, ...); followed by char *foo ();
1620 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1622 /* Return types must still match. */
1623 && comptypes (TREE_TYPE (oldtype),
1624 TREE_TYPE (newtype))
1625 && TYPE_ARG_TYPES (newtype) == 0))
1627 error_with_decl (newdecl, "conflicting types for `%s'");
1628 /* Check for function type mismatch
1629 involving an empty arglist vs a nonempty one. */
1630 if (TREE_CODE (olddecl) == FUNCTION_DECL
1631 && comptypes (TREE_TYPE (oldtype),
1632 TREE_TYPE (newtype))
1633 && ((TYPE_ARG_TYPES (oldtype) == 0
1634 && DECL_INITIAL (olddecl) == 0)
1636 (TYPE_ARG_TYPES (newtype) == 0
1637 && DECL_INITIAL (newdecl) == 0)))
1639 /* Classify the problem further. */
1640 register tree t = TYPE_ARG_TYPES (oldtype);
1642 t = TYPE_ARG_TYPES (newtype);
1643 for (; t; t = TREE_CHAIN (t))
1645 register tree type = TREE_VALUE (t);
1647 if (TREE_CHAIN (t) == 0
1648 && TYPE_MAIN_VARIANT (type) != void_type_node)
1650 error ("A parameter list with an ellipsis can't match an empty parameter name list declaration.");
1654 if (TYPE_MAIN_VARIANT (type) == float_type_node
1655 || C_PROMOTING_INTEGER_TYPE_P (type))
1657 error ("An argument type that has a default promotion can't match an empty parameter name list declaration.");
1662 error_with_decl (olddecl, "previous declaration of `%s'");
1666 errmsg = redeclaration_error_message (newdecl, olddecl);
1672 error_with_decl (newdecl, "redefinition of `%s'");
1675 error_with_decl (newdecl, "redeclaration of `%s'");
1678 error_with_decl (newdecl, "conflicting declarations of `%s'");
1684 error_with_decl (olddecl,
1685 ((DECL_INITIAL (olddecl)
1686 && current_binding_level == global_binding_level)
1687 ? "`%s' previously defined here"
1688 : "`%s' previously declared here"));
1690 else if (TREE_CODE (newdecl) == TYPE_DECL
1691 && (DECL_IN_SYSTEM_HEADER (olddecl)
1692 || DECL_IN_SYSTEM_HEADER (newdecl)))
1694 warning_with_decl (newdecl, "redefinition of `%s'");
1697 ((DECL_INITIAL (olddecl)
1698 && current_binding_level == global_binding_level)
1699 ? "`%s' previously defined here"
1700 : "`%s' previously declared here"));
1702 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1703 && DECL_INITIAL (olddecl) != 0
1704 && TYPE_ARG_TYPES (oldtype) == 0
1705 && TYPE_ARG_TYPES (newtype) != 0
1706 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1708 register tree type, parm;
1710 /* Prototype decl follows defn w/o prototype. */
1712 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1713 type = TYPE_ARG_TYPES (newtype),
1716 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1718 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1719 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1721 warning_with_decl (newdecl, "prototype for `%s' follows");
1722 warning_with_decl (olddecl, "non-prototype definition here");
1725 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1726 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1728 error_with_decl (newdecl, "prototype for `%s' follows and number of arguments doesn't match");
1729 error_with_decl (olddecl, "non-prototype definition here");
1733 /* Type for passing arg must be consistent
1734 with that declared for the arg. */
1735 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1736 /* If -traditional, allow `unsigned int' instead of `int'
1737 in the prototype. */
1738 && (! (flag_traditional
1739 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1740 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1742 error_with_decl (newdecl,
1743 "prototype for `%s' follows and argument %d doesn't match",
1745 error_with_decl (olddecl, "non-prototype definition here");
1751 /* Warn about mismatches in various flags. */
1754 /* Warn if function is now inline
1755 but was previously declared not inline and has been called. */
1756 if (TREE_CODE (olddecl) == FUNCTION_DECL
1757 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1758 && TREE_USED (olddecl))
1759 warning_with_decl (newdecl,
1760 "`%s' declared inline after being called");
1761 if (TREE_CODE (olddecl) == FUNCTION_DECL
1762 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1763 && DECL_INITIAL (olddecl) != 0)
1764 warning_with_decl (newdecl,
1765 "`%s' declared inline after its definition");
1767 /* If pedantic, warn when static declaration follows a non-static
1768 declaration. Otherwise, do so only for functions. */
1769 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1770 && TREE_PUBLIC (olddecl)
1771 && !TREE_PUBLIC (newdecl))
1772 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1774 /* If warn_traditional, warn when a non-static function
1775 declaration follows a static one. */
1776 if (warn_traditional
1777 && TREE_CODE (olddecl) == FUNCTION_DECL
1778 && !TREE_PUBLIC (olddecl)
1779 && TREE_PUBLIC (newdecl))
1780 warning_with_decl (newdecl, "non-static declaration for `%s' follows static");
1782 /* Warn when const declaration follows a non-const
1783 declaration, but not for functions. */
1784 if (TREE_CODE (olddecl) != FUNCTION_DECL
1785 && !TREE_READONLY (olddecl)
1786 && TREE_READONLY (newdecl))
1787 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1788 /* These bits are logically part of the type, for variables.
1789 But not for functions
1790 (where qualifiers are not valid ANSI anyway). */
1791 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1792 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1793 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1794 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1798 /* Optionally warn about more than one declaration for the same name. */
1799 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1800 /* Don't warn about a function declaration
1801 followed by a definition. */
1802 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1803 && DECL_INITIAL (olddecl) == 0)
1804 /* Don't warn about extern decl followed by (tentative) definition. */
1805 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1807 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1808 warning_with_decl (olddecl, "previous declaration of `%s'");
1811 /* Copy all the DECL_... slots specified in the new decl
1812 except for any that we copy here from the old type.
1814 Past this point, we don't change OLDTYPE and NEWTYPE
1815 even if we change the types of NEWDECL and OLDDECL. */
1819 /* When copying info to olddecl, we store into write_olddecl
1820 instead. This allows us to avoid modifying olddecl when
1821 different_binding_level is true. */
1822 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1824 /* Make sure we put the new type in the same obstack as the old ones.
1825 If the old types are not both in the same obstack, use the permanent
1827 if (TYPE_OBSTACK (oldtype) == TYPE_OBSTACK (newtype))
1828 push_obstacks (TYPE_OBSTACK (oldtype), TYPE_OBSTACK (oldtype));
1831 push_obstacks_nochange ();
1832 end_temporary_allocation ();
1835 /* Merge the data types specified in the two decls. */
1836 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1838 if (different_binding_level)
1840 = build_type_attribute_variant
1842 merge_attributes (TYPE_ATTRIBUTES (newtype),
1843 TYPE_ATTRIBUTES (oldtype)));
1846 = TREE_TYPE (olddecl)
1847 = common_type (newtype, oldtype);
1850 /* Lay the type out, unless already done. */
1851 if (oldtype != TREE_TYPE (newdecl))
1853 if (TREE_TYPE (newdecl) != error_mark_node)
1854 layout_type (TREE_TYPE (newdecl));
1855 if (TREE_CODE (newdecl) != FUNCTION_DECL
1856 && TREE_CODE (newdecl) != TYPE_DECL
1857 && TREE_CODE (newdecl) != CONST_DECL)
1858 layout_decl (newdecl, 0);
1862 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1863 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1864 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1865 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1866 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1869 /* Keep the old rtl since we can safely use it. */
1870 DECL_RTL (newdecl) = DECL_RTL (olddecl);
1872 /* Merge the type qualifiers. */
1873 if (DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1874 && !TREE_THIS_VOLATILE (newdecl))
1875 TREE_THIS_VOLATILE (write_olddecl) = 0;
1876 if (TREE_READONLY (newdecl))
1877 TREE_READONLY (write_olddecl) = 1;
1878 if (TREE_THIS_VOLATILE (newdecl))
1880 TREE_THIS_VOLATILE (write_olddecl) = 1;
1881 if (TREE_CODE (newdecl) == VAR_DECL)
1882 make_var_volatile (newdecl);
1885 /* Keep source location of definition rather than declaration. */
1886 /* When called with different_binding_level set, keep the old
1887 information so that meaningful diagnostics can be given. */
1888 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1889 && ! different_binding_level)
1891 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1892 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1895 /* Merge the unused-warning information. */
1896 if (DECL_IN_SYSTEM_HEADER (olddecl))
1897 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1898 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1899 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1901 /* Merge the initialization information. */
1902 /* When called with different_binding_level set, don't copy over
1903 DECL_INITIAL, so that we don't accidentally change function
1904 declarations into function definitions. */
1905 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1906 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1908 /* Merge the section attribute.
1909 We want to issue an error if the sections conflict but that must be
1910 done later in decl_attributes since we are called before attributes
1912 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1913 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1915 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1917 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1918 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1920 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1921 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1922 DECL_NO_CHECK_MEMORY_USAGE (newdecl)
1923 |= DECL_NO_CHECK_MEMORY_USAGE (olddecl);
1928 /* If cannot merge, then use the new type and qualifiers,
1929 and don't preserve the old rtl. */
1930 else if (! different_binding_level)
1932 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1933 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1934 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1935 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1938 /* Merge the storage class information. */
1939 DECL_WEAK (newdecl) |= DECL_WEAK (olddecl);
1940 /* For functions, static overrides non-static. */
1941 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1943 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1944 /* This is since we don't automatically
1945 copy the attributes of NEWDECL into OLDDECL. */
1946 /* No need to worry about different_binding_level here because
1947 then TREE_PUBLIC (newdecl) was true. */
1948 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1949 /* If this clears `static', clear it in the identifier too. */
1950 if (! TREE_PUBLIC (olddecl))
1951 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1953 if (DECL_EXTERNAL (newdecl))
1955 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1956 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1957 /* An extern decl does not override previous storage class. */
1958 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1959 if (! DECL_EXTERNAL (newdecl))
1960 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1964 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1965 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1968 /* If either decl says `inline', this fn is inline,
1969 unless its definition was passed already. */
1970 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
1971 DECL_INLINE (olddecl) = 1;
1972 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1974 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1976 if (DECL_BUILT_IN (olddecl))
1978 /* Get rid of any built-in function if new arg types don't match it
1979 or if we have a function definition. */
1980 if (! types_match || new_is_definition)
1982 if (! different_binding_level)
1984 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1985 DECL_BUILT_IN (olddecl) = 0;
1990 /* If redeclaring a builtin function, and not a definition,
1991 it stays built in. */
1992 DECL_BUILT_IN (newdecl) = 1;
1993 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1996 /* Also preserve various other info from the definition. */
1997 else if (! new_is_definition)
1998 DECL_FRAME_SIZE (newdecl) = DECL_FRAME_SIZE (olddecl);
1999 if (! new_is_definition)
2001 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2002 /* When called with different_binding_level set, don't copy over
2003 DECL_INITIAL, so that we don't accidentally change function
2004 declarations into function definitions. */
2005 if (! different_binding_level)
2006 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2007 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
2008 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2009 if (DECL_INLINE (newdecl))
2010 DECL_ABSTRACT_ORIGIN (newdecl) = DECL_ORIGIN (olddecl);
2013 if (different_binding_level)
2015 /* Don't output a duplicate symbol or debugging information for this
2018 Do not set TREE_ASM_WRITTEN for a FUNCTION_DECL since we may actually
2019 just have two declarations without a definition. VAR_DECLs may need
2020 the same treatment, I'm not sure. */
2021 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2022 DECL_IGNORED_P (newdecl) = 1;
2024 TREE_ASM_WRITTEN (newdecl) = DECL_IGNORED_P (newdecl) = 1;
2028 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2029 But preserve OLDDECL's DECL_UID. */
2031 register unsigned olddecl_uid = DECL_UID (olddecl);
2033 bcopy ((char *) newdecl + sizeof (struct tree_common),
2034 (char *) olddecl + sizeof (struct tree_common),
2035 sizeof (struct tree_decl) - sizeof (struct tree_common));
2036 DECL_UID (olddecl) = olddecl_uid;
2039 /* NEWDECL contains the merged attribute lists.
2040 Update OLDDECL to be the same. */
2041 DECL_MACHINE_ATTRIBUTES (olddecl) = DECL_MACHINE_ATTRIBUTES (newdecl);
2046 /* Record a decl-node X as belonging to the current lexical scope.
2047 Check for errors (such as an incompatible declaration for the same
2048 name already seen in the same scope).
2050 Returns either X or an old decl for the same name.
2051 If an old decl is returned, it may have been smashed
2052 to agree with what X says. */
2059 register tree name = DECL_NAME (x);
2060 register struct binding_level *b = current_binding_level;
2062 DECL_CONTEXT (x) = current_function_decl;
2063 /* A local extern declaration for a function doesn't constitute nesting.
2064 A local auto declaration does, since it's a forward decl
2065 for a nested function coming later. */
2066 if (TREE_CODE (x) == FUNCTION_DECL && DECL_INITIAL (x) == 0
2067 && DECL_EXTERNAL (x))
2068 DECL_CONTEXT (x) = 0;
2070 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
2071 && x != IDENTIFIER_IMPLICIT_DECL (name)
2072 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
2073 && !DECL_IN_SYSTEM_HEADER (x))
2074 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
2080 int different_binding_level = 0;
2082 t = lookup_name_current_level (name);
2083 /* Don't type check externs here when -traditional. This is so that
2084 code with conflicting declarations inside blocks will get warnings
2085 not errors. X11 for instance depends on this. */
2086 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
2088 t = IDENTIFIER_GLOBAL_VALUE (name);
2089 /* Type decls at global scope don't conflict with externs declared
2090 inside lexical blocks. */
2091 if (t && TREE_CODE (t) == TYPE_DECL)
2093 different_binding_level = 1;
2095 if (t != 0 && t == error_mark_node)
2096 /* error_mark_node is 0 for a while during initialization! */
2099 error_with_decl (x, "`%s' used prior to declaration");
2104 file = DECL_SOURCE_FILE (t);
2105 line = DECL_SOURCE_LINE (t);
2108 /* If this decl is `static' and an implicit decl was seen previously,
2109 warn. But don't complain if -traditional,
2110 since traditional compilers don't complain. */
2111 if (! flag_traditional && TREE_PUBLIC (name)
2112 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2113 sets this for all functions. */
2114 && ! TREE_PUBLIC (x)
2115 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2116 /* We used to warn also for explicit extern followed by static,
2117 but sometimes you need to do it that way. */
2118 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2120 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2121 IDENTIFIER_POINTER (name));
2122 pedwarn_with_file_and_line
2123 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2124 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2125 "previous declaration of `%s'",
2126 IDENTIFIER_POINTER (name));
2127 TREE_THIS_VOLATILE (name) = 1;
2130 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2132 if (TREE_CODE (t) == PARM_DECL)
2134 /* Don't allow more than one "real" duplicate
2135 of a forward parm decl. */
2136 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2142 /* If we are processing a typedef statement, generate a whole new
2143 ..._TYPE node (which will be just an variant of the existing
2144 ..._TYPE node with identical properties) and then install the
2145 TYPE_DECL node generated to represent the typedef name as the
2146 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2148 The whole point here is to end up with a situation where each
2149 and every ..._TYPE node the compiler creates will be uniquely
2150 associated with AT MOST one node representing a typedef name.
2151 This way, even though the compiler substitutes corresponding
2152 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2153 early on, later parts of the compiler can always do the reverse
2154 translation and get back the corresponding typedef name. For
2157 typedef struct S MY_TYPE;
2160 Later parts of the compiler might only know that `object' was of
2161 type `struct S' if it were not for code just below. With this
2162 code however, later parts of the compiler see something like:
2164 struct S' == struct S
2165 typedef struct S' MY_TYPE;
2168 And they can then deduce (from the node for type struct S') that
2169 the original object declaration was:
2173 Being able to do this is important for proper support of protoize,
2174 and also for generating precise symbolic debugging information
2175 which takes full account of the programmer's (typedef) vocabulary.
2177 Obviously, we don't want to generate a duplicate ..._TYPE node if
2178 the TYPE_DECL node that we are now processing really represents a
2179 standard built-in type.
2181 Since all standard types are effectively declared at line zero
2182 in the source file, we can easily check to see if we are working
2183 on a standard type by checking the current value of lineno. */
2185 if (TREE_CODE (x) == TYPE_DECL)
2187 if (DECL_SOURCE_LINE (x) == 0)
2189 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2190 TYPE_NAME (TREE_TYPE (x)) = x;
2192 else if (TREE_TYPE (x) != error_mark_node
2193 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2195 tree tt = TREE_TYPE (x);
2196 DECL_ORIGINAL_TYPE (x) = tt;
2197 tt = build_type_copy (tt);
2203 /* Multiple external decls of the same identifier ought to match.
2204 Check against both global declarations (when traditional) and out of
2205 scope (limbo) block level declarations.
2207 We get warnings about inline functions where they are defined.
2208 Avoid duplicate warnings where they are used. */
2209 if (TREE_PUBLIC (x) && ! DECL_INLINE (x))
2213 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2214 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2215 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2216 decl = IDENTIFIER_GLOBAL_VALUE (name);
2217 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2218 /* Decls in limbo are always extern, so no need to check that. */
2219 decl = IDENTIFIER_LIMBO_VALUE (name);
2223 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2224 /* If old decl is built-in, we already warned if we should. */
2225 && !DECL_BUILT_IN (decl))
2227 pedwarn_with_decl (x,
2228 "type mismatch with previous external decl");
2229 pedwarn_with_decl (decl, "previous external decl of `%s'");
2233 /* If a function has had an implicit declaration, and then is defined,
2234 make sure they are compatible. */
2236 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2237 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2238 && TREE_CODE (x) == FUNCTION_DECL
2239 && ! comptypes (TREE_TYPE (x),
2240 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2242 warning_with_decl (x, "type mismatch with previous implicit declaration");
2243 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2244 "previous implicit declaration of `%s'");
2247 /* In PCC-compatibility mode, extern decls of vars with no current decl
2248 take effect at top level no matter where they are. */
2249 if (flag_traditional && DECL_EXTERNAL (x)
2250 && lookup_name (name) == 0)
2252 tree type = TREE_TYPE (x);
2254 /* But don't do this if the type contains temporary nodes. */
2257 if (type == error_mark_node)
2259 if (! TREE_PERMANENT (type))
2261 warning_with_decl (x, "type of external `%s' is not global");
2262 /* By exiting the loop early, we leave TYPE nonzero,
2263 and thus prevent globalization of the decl. */
2266 else if (TREE_CODE (type) == FUNCTION_TYPE
2267 && TYPE_ARG_TYPES (type) != 0)
2268 /* The types might not be truly local,
2269 but the list of arg types certainly is temporary.
2270 Since prototypes are nontraditional,
2271 ok not to do the traditional thing. */
2273 type = TREE_TYPE (type);
2277 b = global_binding_level;
2280 /* This name is new in its binding level.
2281 Install the new declaration and return it. */
2282 if (b == global_binding_level)
2284 /* Install a global value. */
2286 /* If the first global decl has external linkage,
2287 warn if we later see static one. */
2288 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2289 TREE_PUBLIC (name) = 1;
2291 IDENTIFIER_GLOBAL_VALUE (name) = x;
2293 /* We no longer care about any previous block level declarations. */
2294 IDENTIFIER_LIMBO_VALUE (name) = 0;
2296 /* Don't forget if the function was used via an implicit decl. */
2297 if (IDENTIFIER_IMPLICIT_DECL (name)
2298 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2299 TREE_USED (x) = 1, TREE_USED (name) = 1;
2301 /* Don't forget if its address was taken in that way. */
2302 if (IDENTIFIER_IMPLICIT_DECL (name)
2303 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2304 TREE_ADDRESSABLE (x) = 1;
2306 /* Warn about mismatches against previous implicit decl. */
2307 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2308 /* If this real decl matches the implicit, don't complain. */
2309 && ! (TREE_CODE (x) == FUNCTION_DECL
2310 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2311 == integer_type_node)))
2312 pedwarn ("`%s' was previously implicitly declared to return `int'",
2313 IDENTIFIER_POINTER (name));
2315 /* If this decl is `static' and an `extern' was seen previously,
2316 that is erroneous. */
2317 if (TREE_PUBLIC (name)
2318 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2320 /* Okay to redeclare an ANSI built-in as static. */
2321 if (t != 0 && DECL_BUILT_IN (t))
2323 /* Okay to declare a non-ANSI built-in as anything. */
2324 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2326 /* Okay to have global type decl after an earlier extern
2327 declaration inside a lexical block. */
2328 else if (TREE_CODE (x) == TYPE_DECL)
2330 else if (IDENTIFIER_IMPLICIT_DECL (name))
2332 if (! TREE_THIS_VOLATILE (name))
2333 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2334 IDENTIFIER_POINTER (name));
2337 pedwarn ("`%s' was declared `extern' and later `static'",
2338 IDENTIFIER_POINTER (name));
2343 /* Here to install a non-global value. */
2344 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2345 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2346 IDENTIFIER_LOCAL_VALUE (name) = x;
2348 /* If this is an extern function declaration, see if we
2349 have a global definition or declaration for the function. */
2351 && DECL_EXTERNAL (x) && !DECL_INLINE (x)
2353 && TREE_CODE (x) == FUNCTION_DECL
2354 && TREE_CODE (oldglobal) == FUNCTION_DECL)
2356 /* We have one. Their types must agree. */
2357 if (! comptypes (TREE_TYPE (x),
2358 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2359 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2362 /* Inner extern decl is inline if global one is.
2363 Copy enough to really inline it. */
2364 if (DECL_INLINE (oldglobal))
2366 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2367 DECL_INITIAL (x) = (current_function_decl == oldglobal
2368 ? 0 : DECL_INITIAL (oldglobal));
2369 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2370 DECL_FRAME_SIZE (x) = DECL_FRAME_SIZE (oldglobal);
2371 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2372 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2373 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2374 DECL_ABSTRACT_ORIGIN (x) = DECL_ORIGIN (oldglobal);
2376 /* Inner extern decl is built-in if global one is. */
2377 if (DECL_BUILT_IN (oldglobal))
2379 DECL_BUILT_IN (x) = DECL_BUILT_IN (oldglobal);
2380 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2382 /* Keep the arg types from a file-scope fcn defn. */
2383 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2384 && DECL_INITIAL (oldglobal)
2385 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2386 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2390 #if 0 /* This case is probably sometimes the right thing to do. */
2391 /* If we have a local external declaration,
2392 then any file-scope declaration should not
2393 have been static. */
2394 if (oldlocal == 0 && oldglobal != 0
2395 && !TREE_PUBLIC (oldglobal)
2396 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2397 warning ("`%s' locally external but globally static",
2398 IDENTIFIER_POINTER (name));
2401 /* If we have a local external declaration,
2402 and no file-scope declaration has yet been seen,
2403 then if we later have a file-scope decl it must not be static. */
2405 && DECL_EXTERNAL (x)
2409 TREE_PUBLIC (name) = 1;
2411 /* Save this decl, so that we can do type checking against
2412 other decls after it falls out of scope.
2414 Only save it once. This prevents temporary decls created in
2415 expand_inline_function from being used here, since this
2416 will have been set when the inline function was parsed.
2417 It also helps give slightly better warnings. */
2418 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2419 IDENTIFIER_LIMBO_VALUE (name) = x;
2422 /* Warn if shadowing an argument at the top level of the body. */
2423 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2424 /* This warning doesn't apply to the parms of a nested fcn. */
2425 && ! current_binding_level->parm_flag
2426 /* Check that this is one level down from the parms. */
2427 && current_binding_level->level_chain->parm_flag
2428 /* Check that the decl being shadowed
2429 comes from the parm level, one level up. */
2430 && chain_member (oldlocal, current_binding_level->level_chain->names))
2432 if (TREE_CODE (oldlocal) == PARM_DECL)
2433 pedwarn ("declaration of `%s' shadows a parameter",
2434 IDENTIFIER_POINTER (name));
2436 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2437 IDENTIFIER_POINTER (name));
2440 /* Maybe warn if shadowing something else. */
2441 else if (warn_shadow && !DECL_EXTERNAL (x)
2442 /* No shadow warnings for internally generated vars. */
2443 && DECL_SOURCE_LINE (x) != 0
2444 /* No shadow warnings for vars made for inlining. */
2445 && ! DECL_FROM_INLINE (x))
2447 char *id = IDENTIFIER_POINTER (name);
2449 if (TREE_CODE (x) == PARM_DECL
2450 && current_binding_level->level_chain->parm_flag)
2451 /* Don't warn about the parm names in function declarator
2452 within a function declarator.
2453 It would be nice to avoid warning in any function
2454 declarator in a declaration, as opposed to a definition,
2455 but there is no way to tell it's not a definition. */
2457 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2458 warning ("declaration of `%s' shadows a parameter", id);
2459 else if (oldlocal != 0)
2460 warning ("declaration of `%s' shadows previous local", id);
2461 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2462 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2463 warning ("declaration of `%s' shadows global declaration", id);
2466 /* If storing a local value, there may already be one (inherited).
2467 If so, record it for restoration when this binding level ends. */
2469 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2472 /* Keep count of variables in this level with incomplete type. */
2473 if (TYPE_SIZE (TREE_TYPE (x)) == 0)
2477 /* Put decls on list in reverse order.
2478 We will reverse them later if necessary. */
2479 TREE_CHAIN (x) = b->names;
2485 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2488 pushdecl_top_level (x)
2492 register struct binding_level *b = current_binding_level;
2494 current_binding_level = global_binding_level;
2496 current_binding_level = b;
2500 /* Generate an implicit declaration for identifier FUNCTIONID
2501 as a function of type int (). Print a warning if appropriate. */
2504 implicitly_declare (functionid)
2508 int traditional_warning = 0;
2509 /* Only one "implicit declaration" warning per identifier. */
2510 int implicit_warning;
2512 /* Save the decl permanently so we can warn if definition follows. */
2513 push_obstacks_nochange ();
2514 end_temporary_allocation ();
2516 /* We used to reuse an old implicit decl here,
2517 but this loses with inline functions because it can clobber
2518 the saved decl chains. */
2519 /* if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2520 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2522 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2524 /* Warn of implicit decl following explicit local extern decl.
2525 This is probably a program designed for traditional C. */
2526 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2527 traditional_warning = 1;
2529 /* Warn once of an implicit declaration. */
2530 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2532 DECL_EXTERNAL (decl) = 1;
2533 TREE_PUBLIC (decl) = 1;
2535 /* Record that we have an implicit decl and this is it. */
2536 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2538 /* ANSI standard says implicit declarations are in the innermost block.
2539 So we record the decl in the standard fashion.
2540 If flag_traditional is set, pushdecl does it top-level. */
2543 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2544 maybe_objc_check_decl (decl);
2546 rest_of_decl_compilation (decl, NULL_PTR, 0, 0);
2548 if (mesg_implicit_function_declaration && implicit_warning)
2550 if (mesg_implicit_function_declaration == 2)
2551 error ("implicit declaration of function `%s'",
2552 IDENTIFIER_POINTER (functionid));
2554 warning ("implicit declaration of function `%s'",
2555 IDENTIFIER_POINTER (functionid));
2557 else if (warn_traditional && traditional_warning)
2558 warning ("function `%s' was previously declared within a block",
2559 IDENTIFIER_POINTER (functionid));
2561 /* Write a record describing this implicit function declaration to the
2562 prototypes file (if requested). */
2564 gen_aux_info_record (decl, 0, 1, 0);
2571 /* Return zero if the declaration NEWDECL is valid
2572 when the declaration OLDDECL (assumed to be for the same name)
2573 has already been seen.
2574 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
2575 and 3 if it is a conflicting declaration. */
2578 redeclaration_error_message (newdecl, olddecl)
2579 tree newdecl, olddecl;
2581 if (TREE_CODE (newdecl) == TYPE_DECL)
2583 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2585 /* pushdecl creates distinct types for TYPE_DECLs by calling
2586 build_type_copy, so the above comparison generally fails. We do
2587 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2588 is equivalent to what this code used to do before the build_type_copy
2589 call. The variant type distinction should not matter for traditional
2590 code, because it doesn't have type qualifiers. */
2591 if (flag_traditional
2592 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
2594 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2598 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2600 /* Declarations of functions can insist on internal linkage
2601 but they can't be inconsistent with internal linkage,
2602 so there can be no error on that account.
2603 However defining the same name twice is no good. */
2604 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2605 /* However, defining once as extern inline and a second
2606 time in another way is ok. */
2607 && !(DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2608 && !(DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2612 else if (current_binding_level == global_binding_level)
2614 /* Objects declared at top level: */
2615 /* If at least one is a reference, it's ok. */
2616 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2618 /* Reject two definitions. */
2619 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2621 /* Now we have two tentative defs, or one tentative and one real def. */
2622 /* Insist that the linkage match. */
2623 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2627 else if (current_binding_level->parm_flag
2628 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2632 /* Newdecl has block scope. If olddecl has block scope also, then
2633 reject two definitions, and reject a definition together with an
2634 external reference. Otherwise, it is OK, because newdecl must
2635 be an extern reference to olddecl. */
2636 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2637 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2643 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2644 Create one if none exists so far for the current function.
2645 This function is called for both label definitions and label references. */
2651 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2653 if (current_function_decl == 0)
2655 error ("label %s referenced outside of any function",
2656 IDENTIFIER_POINTER (id));
2660 /* Use a label already defined or ref'd with this name. */
2663 /* But not if it is inherited and wasn't declared to be inheritable. */
2664 if (DECL_CONTEXT (decl) != current_function_decl
2665 && ! C_DECLARED_LABEL_FLAG (decl))
2666 return shadow_label (id);
2670 decl = build_decl (LABEL_DECL, id, void_type_node);
2672 /* Make sure every label has an rtx. */
2675 /* A label not explicitly declared must be local to where it's ref'd. */
2676 DECL_CONTEXT (decl) = current_function_decl;
2678 DECL_MODE (decl) = VOIDmode;
2680 /* Say where one reference is to the label,
2681 for the sake of the error if it is not defined. */
2682 DECL_SOURCE_LINE (decl) = lineno;
2683 DECL_SOURCE_FILE (decl) = input_filename;
2685 IDENTIFIER_LABEL_VALUE (id) = decl;
2687 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2692 /* Make a label named NAME in the current function,
2693 shadowing silently any that may be inherited from containing functions
2694 or containing scopes.
2696 Note that valid use, if the label being shadowed
2697 comes from another scope in the same function,
2698 requires calling declare_nonlocal_label right away. */
2704 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2710 /* Check to make sure that the label hasn't already been declared
2711 at this label scope */
2712 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2713 if (TREE_VALUE (dup) == decl)
2715 error ("duplicate label declaration `%s'",
2716 IDENTIFIER_POINTER (name));
2717 error_with_decl (TREE_VALUE (dup),
2718 "this is a previous declaration");
2719 /* Just use the previous declaration. */
2720 return lookup_label (name);
2723 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2724 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2727 return lookup_label (name);
2730 /* Define a label, specifying the location in the source file.
2731 Return the LABEL_DECL node for the label, if the definition is valid.
2732 Otherwise return 0. */
2735 define_label (filename, line, name)
2740 tree decl = lookup_label (name);
2742 /* If label with this name is known from an outer context, shadow it. */
2743 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2745 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2746 IDENTIFIER_LABEL_VALUE (name) = 0;
2747 decl = lookup_label (name);
2750 if (DECL_INITIAL (decl) != 0)
2752 error ("duplicate label `%s'", IDENTIFIER_POINTER (name));
2757 /* Mark label as having been defined. */
2758 DECL_INITIAL (decl) = error_mark_node;
2759 /* Say where in the source. */
2760 DECL_SOURCE_FILE (decl) = filename;
2761 DECL_SOURCE_LINE (decl) = line;
2766 /* Return the list of declarations of the current level.
2767 Note that this list is in reverse order unless/until
2768 you nreverse it; and when you do nreverse it, you must
2769 store the result back using `storedecls' or you will lose. */
2774 return current_binding_level->names;
2777 /* Return the list of type-tags (for structs, etc) of the current level. */
2782 return current_binding_level->tags;
2785 /* Store the list of declarations of the current level.
2786 This is done for the parameter declarations of a function being defined,
2787 after they are modified in the light of any missing parameters. */
2793 current_binding_level->names = decls;
2796 /* Similarly, store the list of tags of the current level. */
2802 current_binding_level->tags = tags;
2805 /* Given NAME, an IDENTIFIER_NODE,
2806 return the structure (or union or enum) definition for that name.
2807 Searches binding levels from BINDING_LEVEL up to the global level.
2808 If THISLEVEL_ONLY is nonzero, searches only the specified context
2809 (but skips any tag-transparent contexts to find one that is
2810 meaningful for tags).
2811 CODE says which kind of type the caller wants;
2812 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2813 If the wrong kind of type is found, an error is reported. */
2816 lookup_tag (code, name, binding_level, thislevel_only)
2817 enum tree_code code;
2818 struct binding_level *binding_level;
2822 register struct binding_level *level;
2824 for (level = binding_level; level; level = level->level_chain)
2827 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2829 if (TREE_PURPOSE (tail) == name)
2831 if (TREE_CODE (TREE_VALUE (tail)) != code)
2833 /* Definition isn't the kind we were looking for. */
2834 pending_invalid_xref = name;
2835 pending_invalid_xref_file = input_filename;
2836 pending_invalid_xref_line = lineno;
2838 return TREE_VALUE (tail);
2841 if (thislevel_only && ! level->tag_transparent)
2847 /* Print an error message now
2848 for a recent invalid struct, union or enum cross reference.
2849 We don't print them immediately because they are not invalid
2850 when used in the `struct foo;' construct for shadowing. */
2853 pending_xref_error ()
2855 if (pending_invalid_xref != 0)
2856 error_with_file_and_line (pending_invalid_xref_file,
2857 pending_invalid_xref_line,
2858 "`%s' defined as wrong kind of tag",
2859 IDENTIFIER_POINTER (pending_invalid_xref));
2860 pending_invalid_xref = 0;
2863 /* Given a type, find the tag that was defined for it and return the tag name.
2864 Otherwise return 0. */
2867 lookup_tag_reverse (type)
2870 register struct binding_level *level;
2872 for (level = current_binding_level; level; level = level->level_chain)
2875 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2877 if (TREE_VALUE (tail) == type)
2878 return TREE_PURPOSE (tail);
2884 /* Look up NAME in the current binding level and its superiors
2885 in the namespace of variables, functions and typedefs.
2886 Return a ..._DECL node of some kind representing its definition,
2887 or return 0 if it is undefined. */
2894 if (current_binding_level != global_binding_level
2895 && IDENTIFIER_LOCAL_VALUE (name))
2896 val = IDENTIFIER_LOCAL_VALUE (name);
2898 val = IDENTIFIER_GLOBAL_VALUE (name);
2902 /* Similar to `lookup_name' but look only at current binding level. */
2905 lookup_name_current_level (name)
2910 if (current_binding_level == global_binding_level)
2911 return IDENTIFIER_GLOBAL_VALUE (name);
2913 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2916 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2917 if (DECL_NAME (t) == name)
2923 /* Create the predefined scalar types of C,
2924 and some nodes representing standard constants (0, 1, (void *) 0).
2925 Initialize the global binding level.
2926 Make definitions for built-in primitive functions. */
2929 init_decl_processing ()
2931 register tree endlink;
2932 tree ptr_ftype_void, ptr_ftype_ptr;
2933 int wchar_type_size;
2934 tree array_domain_type;
2936 current_function_decl = NULL;
2937 named_labels = NULL;
2938 current_binding_level = NULL_BINDING_LEVEL;
2939 free_binding_level = NULL_BINDING_LEVEL;
2940 pushlevel (0); /* make the binding_level structure for global names */
2941 global_binding_level = current_binding_level;
2943 /* Define `int' and `char' first so that dbx will output them first. */
2945 integer_type_node = make_signed_type (INT_TYPE_SIZE);
2946 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_INT],
2947 integer_type_node));
2949 /* Define `char', which is like either `signed char' or `unsigned char'
2950 but not the same as either. */
2954 ? make_signed_type (CHAR_TYPE_SIZE)
2955 : make_unsigned_type (CHAR_TYPE_SIZE));
2956 pushdecl (build_decl (TYPE_DECL, get_identifier ("char"),
2959 long_integer_type_node = make_signed_type (LONG_TYPE_SIZE);
2960 pushdecl (build_decl (TYPE_DECL, get_identifier ("long int"),
2961 long_integer_type_node));
2963 unsigned_type_node = make_unsigned_type (INT_TYPE_SIZE);
2964 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned int"),
2965 unsigned_type_node));
2967 long_unsigned_type_node = make_unsigned_type (LONG_TYPE_SIZE);
2968 pushdecl (build_decl (TYPE_DECL, get_identifier ("long unsigned int"),
2969 long_unsigned_type_node));
2971 long_long_integer_type_node = make_signed_type (LONG_LONG_TYPE_SIZE);
2972 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long int"),
2973 long_long_integer_type_node));
2975 long_long_unsigned_type_node = make_unsigned_type (LONG_LONG_TYPE_SIZE);
2976 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long unsigned int"),
2977 long_long_unsigned_type_node));
2979 short_integer_type_node = make_signed_type (SHORT_TYPE_SIZE);
2980 pushdecl (build_decl (TYPE_DECL, get_identifier ("short int"),
2981 short_integer_type_node));
2983 short_unsigned_type_node = make_unsigned_type (SHORT_TYPE_SIZE);
2984 pushdecl (build_decl (TYPE_DECL, get_identifier ("short unsigned int"),
2985 short_unsigned_type_node));
2987 /* `unsigned long' is the standard type for sizeof.
2988 Traditionally, use a signed type.
2989 Note that stddef.h uses `unsigned long',
2990 and this must agree, even if long and int are the same size. */
2992 (TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE))));
2993 if (flag_traditional && TREE_UNSIGNED (sizetype))
2994 set_sizetype (signed_type (sizetype));
2997 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE)));
2999 error_mark_node = make_node (ERROR_MARK);
3000 TREE_TYPE (error_mark_node) = error_mark_node;
3002 /* Define both `signed char' and `unsigned char'. */
3003 signed_char_type_node = make_signed_type (CHAR_TYPE_SIZE);
3004 pushdecl (build_decl (TYPE_DECL, get_identifier ("signed char"),
3005 signed_char_type_node));
3007 unsigned_char_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
3008 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned char"),
3009 unsigned_char_type_node));
3011 /* Create the widest literal types. */
3012 widest_integer_literal_type_node = make_signed_type (HOST_BITS_PER_WIDE_INT * 2);
3013 pushdecl (build_decl (TYPE_DECL, NULL_TREE,
3014 widest_integer_literal_type_node));
3016 widest_unsigned_literal_type_node = make_unsigned_type (HOST_BITS_PER_WIDE_INT * 2);
3017 pushdecl (build_decl (TYPE_DECL, NULL_TREE,
3018 widest_unsigned_literal_type_node));
3020 /* Now all the integer mode types. */
3021 intQI_type_node = make_signed_type (GET_MODE_BITSIZE (QImode));
3022 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intQI_type_node));
3024 intHI_type_node = make_signed_type (GET_MODE_BITSIZE (HImode));
3025 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intHI_type_node));
3027 intSI_type_node = make_signed_type (GET_MODE_BITSIZE (SImode));
3028 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intSI_type_node));
3030 intDI_type_node = make_signed_type (GET_MODE_BITSIZE (DImode));
3031 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
3033 #if HOST_BITS_PER_WIDE_INT >= 64
3034 intTI_type_node = make_signed_type (GET_MODE_BITSIZE (TImode));
3035 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intTI_type_node));
3038 unsigned_intQI_type_node = make_unsigned_type (GET_MODE_BITSIZE (QImode));
3039 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node));
3041 unsigned_intHI_type_node = make_unsigned_type (GET_MODE_BITSIZE (HImode));
3042 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intHI_type_node));
3044 unsigned_intSI_type_node = make_unsigned_type (GET_MODE_BITSIZE (SImode));
3045 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intSI_type_node));
3047 unsigned_intDI_type_node = make_unsigned_type (GET_MODE_BITSIZE (DImode));
3048 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node));
3050 #if HOST_BITS_PER_WIDE_INT >= 64
3051 unsigned_intTI_type_node = make_unsigned_type (GET_MODE_BITSIZE (TImode));
3052 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intTI_type_node));
3055 float_type_node = make_node (REAL_TYPE);
3056 TYPE_PRECISION (float_type_node) = FLOAT_TYPE_SIZE;
3057 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_FLOAT],
3059 layout_type (float_type_node);
3061 double_type_node = make_node (REAL_TYPE);
3062 if (flag_short_double)
3063 TYPE_PRECISION (double_type_node) = FLOAT_TYPE_SIZE;
3065 TYPE_PRECISION (double_type_node) = DOUBLE_TYPE_SIZE;
3066 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_DOUBLE],
3068 layout_type (double_type_node);
3070 long_double_type_node = make_node (REAL_TYPE);
3071 TYPE_PRECISION (long_double_type_node) = LONG_DOUBLE_TYPE_SIZE;
3072 pushdecl (build_decl (TYPE_DECL, get_identifier ("long double"),
3073 long_double_type_node));
3074 layout_type (long_double_type_node);
3076 complex_integer_type_node = make_node (COMPLEX_TYPE);
3077 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex int"),
3078 complex_integer_type_node));
3079 TREE_TYPE (complex_integer_type_node) = integer_type_node;
3080 layout_type (complex_integer_type_node);
3082 complex_float_type_node = make_node (COMPLEX_TYPE);
3083 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex float"),
3084 complex_float_type_node));
3085 TREE_TYPE (complex_float_type_node) = float_type_node;
3086 layout_type (complex_float_type_node);
3088 complex_double_type_node = make_node (COMPLEX_TYPE);
3089 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex double"),
3090 complex_double_type_node));
3091 TREE_TYPE (complex_double_type_node) = double_type_node;
3092 layout_type (complex_double_type_node);
3094 complex_long_double_type_node = make_node (COMPLEX_TYPE);
3095 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex long double"),
3096 complex_long_double_type_node));
3097 TREE_TYPE (complex_long_double_type_node) = long_double_type_node;
3098 layout_type (complex_long_double_type_node);
3101 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (WCHAR_TYPE)));
3102 wchar_type_size = TYPE_PRECISION (wchar_type_node);
3103 signed_wchar_type_node = signed_type (wchar_type_node);
3104 unsigned_wchar_type_node = unsigned_type (wchar_type_node);
3106 integer_zero_node = build_int_2 (0, 0);
3107 TREE_TYPE (integer_zero_node) = integer_type_node;
3108 integer_one_node = build_int_2 (1, 0);
3109 TREE_TYPE (integer_one_node) = integer_type_node;
3111 boolean_type_node = integer_type_node;
3112 boolean_true_node = integer_one_node;
3113 boolean_false_node = integer_zero_node;
3115 size_zero_node = build_int_2 (0, 0);
3116 TREE_TYPE (size_zero_node) = sizetype;
3117 size_one_node = build_int_2 (1, 0);
3118 TREE_TYPE (size_one_node) = sizetype;
3120 void_type_node = make_node (VOID_TYPE);
3121 pushdecl (build_decl (TYPE_DECL,
3122 ridpointers[(int) RID_VOID], void_type_node));
3123 layout_type (void_type_node); /* Uses integer_zero_node */
3124 /* We are not going to have real types in C with less than byte alignment,
3125 so we might as well not have any types that claim to have it. */
3126 TYPE_ALIGN (void_type_node) = BITS_PER_UNIT;
3128 null_pointer_node = build_int_2 (0, 0);
3129 TREE_TYPE (null_pointer_node) = build_pointer_type (void_type_node);
3130 layout_type (TREE_TYPE (null_pointer_node));
3132 string_type_node = build_pointer_type (char_type_node);
3133 const_string_type_node
3134 = build_pointer_type (build_type_variant (char_type_node, 1, 0));
3136 /* Make a type to be the domain of a few array types
3137 whose domains don't really matter.
3138 200 is small enough that it always fits in size_t
3139 and large enough that it can hold most function names for the
3140 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
3141 array_domain_type = build_index_type (build_int_2 (200, 0));
3143 /* make a type for arrays of characters.
3144 With luck nothing will ever really depend on the length of this
3146 char_array_type_node
3147 = build_array_type (char_type_node, array_domain_type);
3148 /* Likewise for arrays of ints. */
3150 = build_array_type (integer_type_node, array_domain_type);
3151 /* This is for wide string constants. */
3152 wchar_array_type_node
3153 = build_array_type (wchar_type_node, array_domain_type);
3155 void_list_node = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
3157 default_function_type
3158 = build_function_type (integer_type_node, NULL_TREE);
3160 ptr_type_node = build_pointer_type (void_type_node);
3162 = build_pointer_type (build_type_variant (void_type_node, 1, 0));
3164 c_common_nodes_and_builtins (0, flag_no_builtin, flag_no_nonansi_builtin);
3166 endlink = void_list_node;
3167 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
3169 = build_function_type (ptr_type_node,
3170 tree_cons (NULL_TREE, ptr_type_node, endlink));
3172 builtin_function ("__builtin_aggregate_incoming_address",
3173 build_function_type (ptr_type_node, NULL_TREE),
3174 BUILT_IN_AGGREGATE_INCOMING_ADDRESS, NULL_PTR);
3176 /* Hooks for the DWARF 2 __throw routine. */
3177 builtin_function ("__builtin_unwind_init",
3178 build_function_type (void_type_node, endlink),
3179 BUILT_IN_UNWIND_INIT, NULL_PTR);
3180 builtin_function ("__builtin_dwarf_cfa", ptr_ftype_void,
3181 BUILT_IN_DWARF_CFA, NULL_PTR);
3182 builtin_function ("__builtin_dwarf_fp_regnum",
3183 build_function_type (unsigned_type_node, endlink),
3184 BUILT_IN_DWARF_FP_REGNUM, NULL_PTR);
3185 builtin_function ("__builtin_dwarf_reg_size", int_ftype_int,
3186 BUILT_IN_DWARF_REG_SIZE, NULL_PTR);
3187 builtin_function ("__builtin_frob_return_addr", ptr_ftype_ptr,
3188 BUILT_IN_FROB_RETURN_ADDR, NULL_PTR);
3189 builtin_function ("__builtin_extract_return_addr", ptr_ftype_ptr,
3190 BUILT_IN_EXTRACT_RETURN_ADDR, NULL_PTR);
3192 ("__builtin_eh_return",
3193 build_function_type (void_type_node,
3194 tree_cons (NULL_TREE, ptr_type_node,
3195 tree_cons (NULL_TREE,
3196 type_for_mode (ptr_mode, 0),
3197 tree_cons (NULL_TREE,
3200 BUILT_IN_EH_RETURN, NULL_PTR);
3202 pedantic_lvalues = pedantic;
3204 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
3205 declare_function_name ();
3207 start_identifier_warnings ();
3209 /* Prepare to check format strings against argument lists. */
3210 init_function_format_info ();
3214 incomplete_decl_finalize_hook = finish_incomplete_decl;
3216 lang_get_alias_set = c_get_alias_set;
3219 /* Return a definition for a builtin function named NAME and whose data type
3220 is TYPE. TYPE should be a function type with argument types.
3221 FUNCTION_CODE tells later passes how to compile calls to this function.
3222 See tree.h for its possible values.
3224 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3225 the name to be called if we can't opencode the function. */
3228 builtin_function (name, type, function_code, library_name)
3231 enum built_in_function function_code;
3232 const char *library_name;
3234 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3235 DECL_EXTERNAL (decl) = 1;
3236 TREE_PUBLIC (decl) = 1;
3237 /* If -traditional, permit redefining a builtin function any way you like.
3238 (Though really, if the program redefines these functions,
3239 it probably won't work right unless compiled with -fno-builtin.) */
3240 if (flag_traditional && name[0] != '_')
3241 DECL_BUILT_IN_NONANSI (decl) = 1;
3243 DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
3244 make_decl_rtl (decl, NULL_PTR, 1);
3246 if (function_code != NOT_BUILT_IN)
3248 DECL_BUILT_IN (decl) = 1;
3249 DECL_FUNCTION_CODE (decl) = function_code;
3251 /* Warn if a function in the namespace for users
3252 is used without an occasion to consider it declared. */
3253 if (name[0] != '_' || name[1] != '_')
3254 C_DECL_ANTICIPATED (decl) = 1;
3259 /* Called when a declaration is seen that contains no names to declare.
3260 If its type is a reference to a structure, union or enum inherited
3261 from a containing scope, shadow that tag name for the current scope
3262 with a forward reference.
3263 If its type defines a new named structure or union
3264 or defines an enum, it is valid but we need not do anything here.
3265 Otherwise, it is an error. */
3268 shadow_tag (declspecs)
3271 shadow_tag_warned (declspecs, 0);
3275 shadow_tag_warned (declspecs, warned)
3278 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3285 pending_invalid_xref = 0;
3287 /* Remove the attributes from declspecs, since they will confuse the
3289 split_specs_attrs (declspecs, &specs, &attrs);
3291 for (link = specs; link; link = TREE_CHAIN (link))
3293 register tree value = TREE_VALUE (link);
3294 register enum tree_code code = TREE_CODE (value);
3296 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3297 /* Used to test also that TYPE_SIZE (value) != 0.
3298 That caused warning for `struct foo;' at top level in the file. */
3300 register tree name = lookup_tag_reverse (value);
3307 if (warned != 1 && code != ENUMERAL_TYPE)
3308 /* Empty unnamed enum OK */
3310 pedwarn ("unnamed struct/union that defines no instances");
3316 t = lookup_tag (code, name, current_binding_level, 1);
3320 t = make_node (code);
3327 if (!warned && ! in_system_header)
3329 warning ("useless keyword or type name in empty declaration");
3336 error ("two types specified in one empty declaration");
3341 pedwarn ("empty declaration");
3345 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3348 groktypename (typename)
3351 if (TREE_CODE (typename) != TREE_LIST)
3353 return grokdeclarator (TREE_VALUE (typename),
3354 TREE_PURPOSE (typename),
3358 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3361 groktypename_in_parm_context (typename)
3364 if (TREE_CODE (typename) != TREE_LIST)
3366 return grokdeclarator (TREE_VALUE (typename),
3367 TREE_PURPOSE (typename),
3371 /* Decode a declarator in an ordinary declaration or data definition.
3372 This is called as soon as the type information and variable name
3373 have been parsed, before parsing the initializer if any.
3374 Here we create the ..._DECL node, fill in its type,
3375 and put it on the list of decls for the current context.
3376 The ..._DECL node is returned as the value.
3378 Exception: for arrays where the length is not specified,
3379 the type is left null, to be filled in by `finish_decl'.
3381 Function definitions do not come here; they go to start_function
3382 instead. However, external and forward declarations of functions
3383 do go through here. Structure field declarations are done by
3384 grokfield and not through here. */
3386 /* Set this to zero to debug not using the temporary obstack
3387 to parse initializers. */
3388 int debug_temp_inits = 1;
3391 start_decl (declarator, declspecs, initialized, attributes, prefix_attributes)
3392 tree declarator, declspecs;
3394 tree attributes, prefix_attributes;
3396 register tree decl = grokdeclarator (declarator, declspecs,
3397 NORMAL, initialized);
3399 int init_written = initialized;
3401 /* The corresponding pop_obstacks is in finish_decl. */
3402 push_obstacks_nochange ();
3404 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3405 && !strcmp (IDENTIFIER_POINTER (DECL_NAME (decl)), "main"))
3406 warning_with_decl (decl, "`%s' is usually a function");
3409 /* Is it valid for this decl to have an initializer at all?
3410 If not, set INITIALIZED to zero, which will indirectly
3411 tell `finish_decl' to ignore the initializer once it is parsed. */
3412 switch (TREE_CODE (decl))
3415 /* typedef foo = bar means give foo the same type as bar.
3416 We haven't parsed bar yet, so `finish_decl' will fix that up.
3417 Any other case of an initialization in a TYPE_DECL is an error. */
3418 if (pedantic || list_length (declspecs) > 1)
3420 error ("typedef `%s' is initialized",
3421 IDENTIFIER_POINTER (DECL_NAME (decl)));
3427 error ("function `%s' is initialized like a variable",
3428 IDENTIFIER_POINTER (DECL_NAME (decl)));
3433 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3434 error ("parameter `%s' is initialized",
3435 IDENTIFIER_POINTER (DECL_NAME (decl)));
3440 /* Don't allow initializations for incomplete types
3441 except for arrays which might be completed by the initialization. */
3442 if (TYPE_SIZE (TREE_TYPE (decl)) != 0)
3444 /* A complete type is ok if size is fixed. */
3446 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3447 || C_DECL_VARIABLE_SIZE (decl))
3449 error ("variable-sized object may not be initialized");
3453 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3455 error ("variable `%s' has initializer but incomplete type",
3456 IDENTIFIER_POINTER (DECL_NAME (decl)));
3459 else if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl))) == 0)
3461 error ("elements of array `%s' have incomplete type",
3462 IDENTIFIER_POINTER (DECL_NAME (decl)));
3469 #if 0 /* Seems redundant with grokdeclarator. */
3470 if (current_binding_level != global_binding_level
3471 && DECL_EXTERNAL (decl)
3472 && TREE_CODE (decl) != FUNCTION_DECL)
3473 warning ("declaration of `%s' has `extern' and is initialized",
3474 IDENTIFIER_POINTER (DECL_NAME (decl)));
3476 DECL_EXTERNAL (decl) = 0;
3477 if (current_binding_level == global_binding_level)
3478 TREE_STATIC (decl) = 1;
3480 /* Tell `pushdecl' this is an initialized decl
3481 even though we don't yet have the initializer expression.
3482 Also tell `finish_decl' it may store the real initializer. */
3483 DECL_INITIAL (decl) = error_mark_node;
3486 /* If this is a function declaration, write a record describing it to the
3487 prototypes file (if requested). */
3489 if (TREE_CODE (decl) == FUNCTION_DECL)
3490 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3492 /* ANSI specifies that a tentative definition which is not merged with
3493 a non-tentative definition behaves exactly like a definition with an
3494 initializer equal to zero. (Section 3.7.2)
3495 -fno-common gives strict ANSI behavior. Usually you don't want it.
3496 This matters only for variables with external linkage. */
3497 if (! flag_no_common || ! TREE_PUBLIC (decl))
3498 DECL_COMMON (decl) = 1;
3500 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
3501 SET_DEFAULT_DECL_ATTRIBUTES (decl, attributes);
3504 /* Set attributes here so if duplicate decl, will have proper attributes. */
3505 decl_attributes (decl, attributes, prefix_attributes);
3507 /* Add this decl to the current binding level.
3508 TEM may equal DECL or it may be a previous decl of the same name. */
3509 tem = pushdecl (decl);
3511 /* For a local variable, define the RTL now. */
3512 if (current_binding_level != global_binding_level
3513 /* But not if this is a duplicate decl
3514 and we preserved the rtl from the previous one
3515 (which may or may not happen). */
3516 && DECL_RTL (tem) == 0)
3518 if (TYPE_SIZE (TREE_TYPE (tem)) != 0)
3520 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3521 && DECL_INITIAL (tem) != 0)
3527 /* When parsing and digesting the initializer,
3528 use temporary storage. Do this even if we will ignore the value. */
3529 if (current_binding_level == global_binding_level && debug_temp_inits)
3530 temporary_allocation ();
3536 /* Finish processing of a declaration;
3537 install its initial value.
3538 If the length of an array type is not known before,
3539 it must be determined now, from the initial value, or it is an error. */
3542 finish_decl (decl, init, asmspec_tree)
3546 register tree type = TREE_TYPE (decl);
3547 int was_incomplete = (DECL_SIZE (decl) == 0);
3548 int temporary = allocation_temporary_p ();
3551 /* If a name was specified, get the string. */
3553 asmspec = TREE_STRING_POINTER (asmspec_tree);
3555 /* If `start_decl' didn't like having an initialization, ignore it now. */
3557 if (init != 0 && DECL_INITIAL (decl) == 0)
3559 /* Don't crash if parm is initialized. */
3560 if (TREE_CODE (decl) == PARM_DECL)
3563 if (ITERATOR_P (decl))
3566 error_with_decl (decl, "iterator has no initial value");
3568 init = save_expr (init);
3573 if (TREE_CODE (decl) != TYPE_DECL)
3574 store_init_value (decl, init);
3577 /* typedef foo = bar; store the type of bar as the type of foo. */
3578 TREE_TYPE (decl) = TREE_TYPE (init);
3579 DECL_INITIAL (decl) = init = 0;
3583 /* Pop back to the obstack that is current for this binding level.
3584 This is because MAXINDEX, rtl, etc. to be made below
3585 must go in the permanent obstack. But don't discard the
3586 temporary data yet. */
3588 #if 0 /* pop_obstacks was near the end; this is what was here. */
3589 if (current_binding_level == global_binding_level && temporary)
3590 end_temporary_allocation ();
3593 /* Deduce size of array from initialization, if not already known */
3595 if (TREE_CODE (type) == ARRAY_TYPE
3596 && TYPE_DOMAIN (type) == 0
3597 && TREE_CODE (decl) != TYPE_DECL)
3600 = (TREE_STATIC (decl)
3601 /* Even if pedantic, an external linkage array
3602 may have incomplete type at first. */
3603 ? pedantic && !TREE_PUBLIC (decl)
3604 : !DECL_EXTERNAL (decl));
3606 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3608 /* Get the completed type made by complete_array_type. */
3609 type = TREE_TYPE (decl);
3612 error_with_decl (decl, "initializer fails to determine size of `%s'");
3617 error_with_decl (decl, "array size missing in `%s'");
3618 /* If a `static' var's size isn't known,
3619 make it extern as well as static, so it does not get
3621 If it is not `static', then do not mark extern;
3622 finish_incomplete_decl will give it a default size
3623 and it will get allocated. */
3624 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3625 DECL_EXTERNAL (decl) = 1;
3628 /* TYPE_MAX_VALUE is always one less than the number of elements
3629 in the array, because we start counting at zero. Therefore,
3630 warn only if the value is less than zero. */
3631 if (pedantic && TYPE_DOMAIN (type) != 0
3632 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3633 error_with_decl (decl, "zero or negative size array `%s'");
3635 layout_decl (decl, 0);
3638 if (TREE_CODE (decl) == VAR_DECL)
3640 if (DECL_SIZE (decl) == 0
3641 && TYPE_SIZE (TREE_TYPE (decl)) != 0)
3642 layout_decl (decl, 0);
3644 if (DECL_SIZE (decl) == 0
3645 && (TREE_STATIC (decl)
3647 /* A static variable with an incomplete type
3648 is an error if it is initialized.
3649 Also if it is not file scope.
3650 Otherwise, let it through, but if it is not `extern'
3651 then it may cause an error message later. */
3652 /* A duplicate_decls call could have changed an extern
3653 declaration into a file scope one. This can be detected
3654 by TREE_ASM_WRITTEN being set. */
3655 (DECL_INITIAL (decl) != 0
3656 || (DECL_CONTEXT (decl) != 0 && ! TREE_ASM_WRITTEN (decl)))
3658 /* An automatic variable with an incomplete type
3660 !DECL_EXTERNAL (decl)))
3662 error_with_decl (decl, "storage size of `%s' isn't known");
3663 TREE_TYPE (decl) = error_mark_node;
3666 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3667 && DECL_SIZE (decl) != 0)
3669 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3670 constant_expression_warning (DECL_SIZE (decl));
3672 error_with_decl (decl, "storage size of `%s' isn't constant");
3675 if (TREE_USED (type))
3676 TREE_USED (decl) = 1;
3679 /* If this is a function and an assembler name is specified, it isn't
3680 builtin any more. Also reset DECL_RTL so we can give it its new
3682 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3684 DECL_BUILT_IN (decl) = 0;
3685 DECL_RTL (decl) = 0;
3688 /* Output the assembler code and/or RTL code for variables and functions,
3689 unless the type is an undefined structure or union.
3690 If not, it will get done when the type is completed. */
3692 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3694 if ((flag_traditional || TREE_PERMANENT (decl))
3695 && allocation_temporary_p ())
3697 push_obstacks_nochange ();
3698 end_temporary_allocation ();
3699 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3700 maybe_objc_check_decl (decl);
3701 rest_of_decl_compilation (decl, asmspec,
3702 (DECL_CONTEXT (decl) == 0
3703 || TREE_ASM_WRITTEN (decl)),
3709 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3710 maybe_objc_check_decl (decl);
3711 rest_of_decl_compilation (decl, asmspec, DECL_CONTEXT (decl) == 0,
3714 if (DECL_CONTEXT (decl) != 0)
3716 /* Recompute the RTL of a local array now
3717 if it used to be an incomplete type. */
3719 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3721 /* If we used it already as memory, it must stay in memory. */
3722 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3723 /* If it's still incomplete now, no init will save it. */
3724 if (DECL_SIZE (decl) == 0)
3725 DECL_INITIAL (decl) = 0;
3728 /* Compute and store the initial value. */
3729 if (TREE_CODE (decl) != FUNCTION_DECL)
3730 expand_decl_init (decl);
3734 if (TREE_CODE (decl) == TYPE_DECL)
3736 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3737 maybe_objc_check_decl (decl);
3738 rest_of_decl_compilation (decl, NULL_PTR, DECL_CONTEXT (decl) == 0,
3742 /* ??? After 2.3, test (init != 0) instead of TREE_CODE. */
3743 /* This test used to include TREE_PERMANENT, however, we have the same
3744 problem with initializers at the function level. Such initializers get
3745 saved until the end of the function on the momentary_obstack. */
3746 if (!(TREE_CODE (decl) == FUNCTION_DECL && DECL_INLINE (decl))
3748 /* DECL_INITIAL is not defined in PARM_DECLs, since it shares
3749 space with DECL_ARG_TYPE. */
3750 && TREE_CODE (decl) != PARM_DECL)
3752 /* We need to remember that this array HAD an initialization,
3753 but discard the actual temporary nodes,
3754 since we can't have a permanent node keep pointing to them. */
3755 /* We make an exception for inline functions, since it's
3756 normal for a local extern redeclaration of an inline function
3757 to have a copy of the top-level decl's DECL_INLINE. */
3758 if (DECL_INITIAL (decl) != 0 && DECL_INITIAL (decl) != error_mark_node)
3760 /* If this is a const variable, then preserve the
3761 initializer instead of discarding it so that we can optimize
3762 references to it. */
3763 /* This test used to include TREE_STATIC, but this won't be set
3764 for function level initializers. */
3765 if (TREE_READONLY (decl) || ITERATOR_P (decl))
3767 preserve_initializer ();
3768 /* Hack? Set the permanent bit for something that is permanent,
3769 but not on the permanent obstack, so as to convince
3770 output_constant_def to make its rtl on the permanent
3772 TREE_PERMANENT (DECL_INITIAL (decl)) = 1;
3774 /* The initializer and DECL must have the same (or equivalent
3775 types), but if the initializer is a STRING_CST, its type
3776 might not be on the right obstack, so copy the type
3778 TREE_TYPE (DECL_INITIAL (decl)) = type;
3781 DECL_INITIAL (decl) = error_mark_node;
3785 /* If requested, warn about definitions of large data objects. */
3787 if (warn_larger_than
3788 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL)
3789 && !DECL_EXTERNAL (decl))
3791 register tree decl_size = DECL_SIZE (decl);
3793 if (decl_size && TREE_CODE (decl_size) == INTEGER_CST)
3795 unsigned units = TREE_INT_CST_LOW(decl_size) / BITS_PER_UNIT;
3797 if (units > larger_than_size)
3798 warning_with_decl (decl, "size of `%s' is %u bytes", units);
3803 /* Resume permanent allocation, if not within a function. */
3804 /* The corresponding push_obstacks_nochange is in start_decl,
3805 and in push_parm_decl and in grokfield. */
3809 /* If we have gone back from temporary to permanent allocation,
3810 actually free the temporary space that we no longer need. */
3811 if (temporary && !allocation_temporary_p ())
3812 permanent_allocation (0);
3814 /* At the end of a declaration, throw away any variable type sizes
3815 of types defined inside that declaration. There is no use
3816 computing them in the following function definition. */
3817 if (current_binding_level == global_binding_level)
3818 get_pending_sizes ();
3821 /* If DECL has a cleanup, build and return that cleanup here.
3822 This is a callback called by expand_expr. */
3825 maybe_build_cleanup (decl)
3826 tree decl ATTRIBUTE_UNUSED;
3828 /* There are no cleanups in C. */
3832 /* Given a parsed parameter declaration,
3833 decode it into a PARM_DECL and push that on the current binding level.
3834 Also, for the sake of forward parm decls,
3835 record the given order of parms in `parm_order'. */
3838 push_parm_decl (parm)
3842 int old_immediate_size_expand = immediate_size_expand;
3843 /* Don't try computing parm sizes now -- wait till fn is called. */
3844 immediate_size_expand = 0;
3846 /* The corresponding pop_obstacks is in finish_decl. */
3847 push_obstacks_nochange ();
3849 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3850 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3851 decl_attributes (decl, TREE_VALUE (TREE_VALUE (parm)),
3852 TREE_PURPOSE (TREE_VALUE (parm)));
3855 if (DECL_NAME (decl))
3858 olddecl = lookup_name (DECL_NAME (decl));
3859 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3860 pedwarn_with_decl (decl, "ANSI C forbids parameter `%s' shadowing typedef");
3864 decl = pushdecl (decl);
3866 immediate_size_expand = old_immediate_size_expand;
3868 current_binding_level->parm_order
3869 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3871 /* Add this decl to the current binding level. */
3872 finish_decl (decl, NULL_TREE, NULL_TREE);
3875 /* Clear the given order of parms in `parm_order'.
3876 Used at start of parm list,
3877 and also at semicolon terminating forward decls. */
3882 current_binding_level->parm_order = NULL_TREE;
3885 /* Make TYPE a complete type based on INITIAL_VALUE.
3886 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3887 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3890 complete_array_type (type, initial_value, do_default)
3895 register tree maxindex = NULL_TREE;
3900 /* Note MAXINDEX is really the maximum index,
3901 one less than the size. */
3902 if (TREE_CODE (initial_value) == STRING_CST)
3905 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3906 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3909 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3911 tree elts = CONSTRUCTOR_ELTS (initial_value);
3912 maxindex = size_binop (MINUS_EXPR, integer_zero_node, size_one_node);
3913 for (; elts; elts = TREE_CHAIN (elts))
3915 if (TREE_PURPOSE (elts))
3916 maxindex = TREE_PURPOSE (elts);
3918 maxindex = size_binop (PLUS_EXPR, maxindex, size_one_node);
3920 maxindex = copy_node (maxindex);
3924 /* Make an error message unless that happened already. */
3925 if (initial_value != error_mark_node)
3928 /* Prevent further error messages. */
3929 maxindex = build_int_2 (0, 0);
3936 maxindex = build_int_2 (0, 0);
3942 TYPE_DOMAIN (type) = build_index_type (maxindex);
3943 if (!TREE_TYPE (maxindex))
3944 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3947 /* Lay out the type now that we can get the real answer. */
3954 /* Given declspecs and a declarator,
3955 determine the name and type of the object declared
3956 and construct a ..._DECL node for it.
3957 (In one case we can return a ..._TYPE node instead.
3958 For invalid input we sometimes return 0.)
3960 DECLSPECS is a chain of tree_list nodes whose value fields
3961 are the storage classes and type specifiers.
3963 DECL_CONTEXT says which syntactic context this declaration is in:
3964 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3965 FUNCDEF for a function definition. Like NORMAL but a few different
3966 error messages in each case. Return value may be zero meaning
3967 this definition is too screwy to try to parse.
3968 PARM for a parameter declaration (either within a function prototype
3969 or before a function body). Make a PARM_DECL, or return void_type_node.
3970 TYPENAME if for a typename (in a cast or sizeof).
3971 Don't make a DECL node; just return the ..._TYPE node.
3972 FIELD for a struct or union field; make a FIELD_DECL.
3973 BITFIELD for a field with specified width.
3974 INITIALIZED is 1 if the decl has an initializer.
3976 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3977 It may also be so in the PARM case, for a prototype where the
3978 argument type is specified but not the name.
3980 This function is where the complicated C meanings of `static'
3981 and `extern' are interpreted. */
3984 grokdeclarator (declarator, declspecs, decl_context, initialized)
3987 enum decl_context decl_context;
3992 tree type = NULL_TREE;
3997 int type_quals = TYPE_UNQUALIFIED;
3999 int explicit_int = 0;
4000 int explicit_char = 0;
4001 int defaulted_int = 0;
4002 tree typedef_decl = 0;
4004 tree typedef_type = 0;
4005 int funcdef_flag = 0;
4006 enum tree_code innermost_code = ERROR_MARK;
4008 int size_varies = 0;
4009 tree decl_machine_attr = NULL_TREE;
4011 if (decl_context == BITFIELD)
4012 bitfield = 1, decl_context = FIELD;
4014 if (decl_context == FUNCDEF)
4015 funcdef_flag = 1, decl_context = NORMAL;
4017 push_obstacks_nochange ();
4019 if (flag_traditional && allocation_temporary_p ())
4020 end_temporary_allocation ();
4022 /* Look inside a declarator for the name being declared
4023 and get it as a string, for an error message. */
4025 register tree decl = declarator;
4029 switch (TREE_CODE (decl))
4034 innermost_code = TREE_CODE (decl);
4035 decl = TREE_OPERAND (decl, 0);
4038 case IDENTIFIER_NODE:
4039 name = IDENTIFIER_POINTER (decl);
4050 /* A function definition's declarator must have the form of
4051 a function declarator. */
4053 if (funcdef_flag && innermost_code != CALL_EXPR)
4056 /* Anything declared one level down from the top level
4057 must be one of the parameters of a function
4058 (because the body is at least two levels down). */
4060 /* If this looks like a function definition, make it one,
4061 even if it occurs where parms are expected.
4062 Then store_parm_decls will reject it and not use it as a parm. */
4063 if (decl_context == NORMAL && !funcdef_flag
4064 && current_binding_level->parm_flag)
4065 decl_context = PARM;
4067 /* Look through the decl specs and record which ones appear.
4068 Some typespecs are defined as built-in typenames.
4069 Others, the ones that are modifiers of other types,
4070 are represented by bits in SPECBITS: set the bits for
4071 the modifiers that appear. Storage class keywords are also in SPECBITS.
4073 If there is a typedef name or a type, store the type in TYPE.
4074 This includes builtin typedefs such as `int'.
4076 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
4077 and did not come from a user typedef.
4079 Set LONGLONG if `long' is mentioned twice. */
4081 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
4084 register tree id = TREE_VALUE (spec);
4086 if (id == ridpointers[(int) RID_INT])
4088 if (id == ridpointers[(int) RID_CHAR])
4091 if (TREE_CODE (id) == IDENTIFIER_NODE)
4092 for (i = (int) RID_FIRST_MODIFIER; i < (int) RID_MAX; i++)
4094 if (ridpointers[i] == id)
4096 if (i == (int) RID_LONG && specbits & (1<<i))
4099 error ("`long long long' is too long for GCC");
4102 if (pedantic && ! in_system_header && warn_long_long)
4103 pedwarn ("ANSI C does not support `long long'");
4107 else if (specbits & (1 << i))
4108 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
4114 error ("two or more data types in declaration of `%s'", name);
4115 /* Actual typedefs come to us as TYPE_DECL nodes. */
4116 else if (TREE_CODE (id) == TYPE_DECL)
4118 type = TREE_TYPE (id);
4119 decl_machine_attr = DECL_MACHINE_ATTRIBUTES (id);
4122 /* Built-in types come as identifiers. */
4123 else if (TREE_CODE (id) == IDENTIFIER_NODE)
4125 register tree t = lookup_name (id);
4126 if (TREE_TYPE (t) == error_mark_node)
4128 else if (!t || TREE_CODE (t) != TYPE_DECL)
4129 error ("`%s' fails to be a typedef or built in type",
4130 IDENTIFIER_POINTER (id));
4133 type = TREE_TYPE (t);
4137 else if (TREE_CODE (id) != ERROR_MARK)
4143 typedef_type = type;
4145 size_varies = C_TYPE_VARIABLE_SIZE (type);
4147 /* No type at all: default to `int', and set DEFAULTED_INT
4148 because it was not a user-defined typedef. */
4152 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4153 | (1 << (int) RID_SIGNED)
4154 | (1 << (int) RID_UNSIGNED))))
4155 /* Don't warn about typedef foo = bar. */
4156 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
4157 && ! (in_system_header && ! allocation_temporary_p ()))
4159 /* Issue a warning if this is an ISO C 9x program or if -Wreturn-type
4160 and this is a function, or if -Wimplicit; prefer the former
4161 warning since it is more explicit. */
4162 if ((warn_implicit_int || warn_return_type) && funcdef_flag)
4163 warn_about_return_type = 1;
4164 else if (warn_implicit_int || flag_isoc9x)
4165 warning ("type defaults to `int' in declaration of `%s'", name);
4169 type = integer_type_node;
4172 /* Now process the modifiers that were specified
4173 and check for invalid combinations. */
4175 /* Long double is a special combination. */
4177 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4178 && TYPE_MAIN_VARIANT (type) == double_type_node)
4180 specbits &= ~ (1 << (int) RID_LONG);
4181 type = long_double_type_node;
4184 /* Check all other uses of type modifiers. */
4186 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4187 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4191 if ((specbits & 1 << (int) RID_LONG)
4192 && (specbits & 1 << (int) RID_SHORT))
4193 error ("both long and short specified for `%s'", name);
4194 else if (((specbits & 1 << (int) RID_LONG)
4195 || (specbits & 1 << (int) RID_SHORT))
4197 error ("long or short specified with char for `%s'", name);
4198 else if (((specbits & 1 << (int) RID_LONG)
4199 || (specbits & 1 << (int) RID_SHORT))
4200 && TREE_CODE (type) == REAL_TYPE)
4202 static int already = 0;
4204 error ("long or short specified with floating type for `%s'", name);
4205 if (! already && ! pedantic)
4207 error ("the only valid combination is `long double'");
4211 else if ((specbits & 1 << (int) RID_SIGNED)
4212 && (specbits & 1 << (int) RID_UNSIGNED))
4213 error ("both signed and unsigned specified for `%s'", name);
4214 else if (TREE_CODE (type) != INTEGER_TYPE)
4215 error ("long, short, signed or unsigned invalid for `%s'", name);
4219 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4221 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4223 if (flag_pedantic_errors)
4228 /* Discard the type modifiers if they are invalid. */
4231 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4232 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4237 if ((specbits & (1 << (int) RID_COMPLEX))
4238 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4240 error ("complex invalid for `%s'", name);
4241 specbits &= ~ (1 << (int) RID_COMPLEX);
4244 /* Decide whether an integer type is signed or not.
4245 Optionally treat bitfields as signed by default. */
4246 if (specbits & 1 << (int) RID_UNSIGNED
4247 /* Traditionally, all bitfields are unsigned. */
4248 || (bitfield && flag_traditional
4249 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4250 || (bitfield && ! flag_signed_bitfields
4251 && (explicit_int || defaulted_int || explicit_char
4252 /* A typedef for plain `int' without `signed'
4253 can be controlled just like plain `int'. */
4254 || ! (typedef_decl != 0
4255 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4256 && TREE_CODE (type) != ENUMERAL_TYPE
4257 && !(specbits & 1 << (int) RID_SIGNED)))
4260 type = long_long_unsigned_type_node;
4261 else if (specbits & 1 << (int) RID_LONG)
4262 type = long_unsigned_type_node;
4263 else if (specbits & 1 << (int) RID_SHORT)
4264 type = short_unsigned_type_node;
4265 else if (type == char_type_node)
4266 type = unsigned_char_type_node;
4267 else if (typedef_decl)
4268 type = unsigned_type (type);
4270 type = unsigned_type_node;
4272 else if ((specbits & 1 << (int) RID_SIGNED)
4273 && type == char_type_node)
4274 type = signed_char_type_node;
4276 type = long_long_integer_type_node;
4277 else if (specbits & 1 << (int) RID_LONG)
4278 type = long_integer_type_node;
4279 else if (specbits & 1 << (int) RID_SHORT)
4280 type = short_integer_type_node;
4282 if (specbits & 1 << (int) RID_COMPLEX)
4284 /* If we just have "complex", it is equivalent to
4285 "complex double", but if any modifiers at all are specified it is
4286 the complex form of TYPE. E.g, "complex short" is
4287 "complex short int". */
4289 if (defaulted_int && ! longlong
4290 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4291 | (1 << (int) RID_SIGNED)
4292 | (1 << (int) RID_UNSIGNED))))
4293 type = complex_double_type_node;
4294 else if (type == integer_type_node)
4295 type = complex_integer_type_node;
4296 else if (type == float_type_node)
4297 type = complex_float_type_node;
4298 else if (type == double_type_node)
4299 type = complex_double_type_node;
4300 else if (type == long_double_type_node)
4301 type = complex_long_double_type_node;
4303 type = build_complex_type (type);
4306 /* Figure out the type qualifiers for the declaration. There are
4307 two ways a declaration can become qualified. One is something
4308 like `const int i' where the `const' is explicit. Another is
4309 something like `typedef const int CI; CI i' where the type of the
4310 declaration contains the `const'. */
4311 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4312 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
4313 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4314 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4316 pedwarn ("duplicate `const'");
4318 pedwarn ("duplicate `restrict'");
4320 pedwarn ("duplicate `volatile'");
4321 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
4322 type = TYPE_MAIN_VARIANT (type);
4323 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4324 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4325 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4327 /* Warn if two storage classes are given. Default to `auto'. */
4332 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4333 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4334 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4335 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4336 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4337 if (specbits & 1 << (int) RID_ITERATOR) nclasses++;
4339 /* Warn about storage classes that are invalid for certain
4340 kinds of declarations (parameters, typenames, etc.). */
4343 error ("multiple storage classes in declaration of `%s'", name);
4344 else if (funcdef_flag
4346 & ((1 << (int) RID_REGISTER)
4347 | (1 << (int) RID_AUTO)
4348 | (1 << (int) RID_TYPEDEF))))
4350 if (specbits & 1 << (int) RID_AUTO
4351 && (pedantic || current_binding_level == global_binding_level))
4352 pedwarn ("function definition declared `auto'");
4353 if (specbits & 1 << (int) RID_REGISTER)
4354 error ("function definition declared `register'");
4355 if (specbits & 1 << (int) RID_TYPEDEF)
4356 error ("function definition declared `typedef'");
4357 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4358 | (1 << (int) RID_AUTO));
4360 else if (decl_context != NORMAL && nclasses > 0)
4362 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4366 error ((decl_context == FIELD
4367 ? "storage class specified for structure field `%s'"
4368 : (decl_context == PARM
4369 ? "storage class specified for parameter `%s'"
4370 : "storage class specified for typename")),
4372 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4373 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4374 | (1 << (int) RID_EXTERN));
4377 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4379 /* `extern' with initialization is invalid if not at top level. */
4380 if (current_binding_level == global_binding_level)
4381 warning ("`%s' initialized and declared `extern'", name);
4383 error ("`%s' has both `extern' and initializer", name);
4385 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4386 && current_binding_level != global_binding_level)
4387 error ("nested function `%s' declared `extern'", name);
4388 else if (current_binding_level == global_binding_level
4389 && specbits & (1 << (int) RID_AUTO))
4390 error ("top-level declaration of `%s' specifies `auto'", name);
4391 else if ((specbits & 1 << (int) RID_ITERATOR)
4392 && TREE_CODE (declarator) != IDENTIFIER_NODE)
4394 error ("iterator `%s' has derived type", name);
4395 type = error_mark_node;
4397 else if ((specbits & 1 << (int) RID_ITERATOR)
4398 && TREE_CODE (type) != INTEGER_TYPE)
4400 error ("iterator `%s' has noninteger type", name);
4401 type = error_mark_node;
4405 /* Now figure out the structure of the declarator proper.
4406 Descend through it, creating more complex types, until we reach
4407 the declared identifier (or NULL_TREE, in an absolute declarator). */
4409 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4411 if (type == error_mark_node)
4413 declarator = TREE_OPERAND (declarator, 0);
4417 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4418 an INDIRECT_REF (for *...),
4419 a CALL_EXPR (for ...(...)),
4420 an identifier (for the name being declared)
4421 or a null pointer (for the place in an absolute declarator
4422 where the name was omitted).
4423 For the last two cases, we have just exited the loop.
4425 At this point, TYPE is the type of elements of an array,
4426 or for a function to return, or for a pointer to point to.
4427 After this sequence of ifs, TYPE is the type of the
4428 array or function or pointer, and DECLARATOR has had its
4429 outermost layer removed. */
4431 if (TREE_CODE (declarator) == ARRAY_REF)
4433 register tree itype = NULL_TREE;
4434 register tree size = TREE_OPERAND (declarator, 1);
4435 /* An uninitialized decl with `extern' is a reference. */
4436 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4437 /* The index is a signed object `sizetype' bits wide. */
4438 tree index_type = signed_type (sizetype);
4440 declarator = TREE_OPERAND (declarator, 0);
4442 /* Check for some types that there cannot be arrays of. */
4444 if (TYPE_MAIN_VARIANT (type) == void_type_node)
4446 error ("declaration of `%s' as array of voids", name);
4447 type = error_mark_node;
4450 if (TREE_CODE (type) == FUNCTION_TYPE)
4452 error ("declaration of `%s' as array of functions", name);
4453 type = error_mark_node;
4456 if (size == error_mark_node)
4457 type = error_mark_node;
4459 if (type == error_mark_node)
4462 /* If this is a block level extern, it must live past the end
4463 of the function so that we can check it against other extern
4464 declarations (IDENTIFIER_LIMBO_VALUE). */
4465 if (extern_ref && allocation_temporary_p ())
4466 end_temporary_allocation ();
4468 /* If size was specified, set ITYPE to a range-type for that size.
4469 Otherwise, ITYPE remains null. finish_decl may figure it out
4470 from an initial value. */
4474 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4475 STRIP_TYPE_NOPS (size);
4477 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
4478 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
4480 error ("size of array `%s' has non-integer type", name);
4481 size = integer_one_node;
4484 if (pedantic && integer_zerop (size))
4485 pedwarn ("ANSI C forbids zero-size array `%s'", name);
4487 if (TREE_CODE (size) == INTEGER_CST)
4489 constant_expression_warning (size);
4490 if (tree_int_cst_sgn (size) < 0)
4492 error ("size of array `%s' is negative", name);
4493 size = integer_one_node;
4498 /* Make sure the array size remains visibly nonconstant
4499 even if it is (eg) a const variable with known value. */
4504 if (TREE_CONSTANT (size))
4505 pedwarn ("ANSI C forbids array `%s' whose size can't be evaluated", name);
4507 pedwarn ("ANSI C forbids variable-size array `%s'", name);
4511 /* Convert size to index_type, so that if it is a variable
4512 the computations will be done in the proper mode. */
4513 itype = fold (build (MINUS_EXPR, index_type,
4514 convert (index_type, size),
4515 convert (index_type, size_one_node)));
4517 /* If that overflowed, the array is too big.
4518 ??? While a size of INT_MAX+1 technically shouldn't cause
4519 an overflow (because we subtract 1), the overflow is recorded
4520 during the conversion to index_type, before the subtraction.
4521 Handling this case seems like an unnecessary complication. */
4522 if (TREE_OVERFLOW (itype))
4524 error ("size of array `%s' is too large", name);
4525 type = error_mark_node;
4530 itype = variable_size (itype);
4531 itype = build_index_type (itype);
4534 #if 0 /* This had bad results for pointers to arrays, as in
4535 union incomplete (*foo)[4]; */
4536 /* Complain about arrays of incomplete types, except in typedefs. */
4538 if (TYPE_SIZE (type) == 0
4539 /* Avoid multiple warnings for nested array types. */
4540 && TREE_CODE (type) != ARRAY_TYPE
4541 && !(specbits & (1 << (int) RID_TYPEDEF))
4542 && !C_TYPE_BEING_DEFINED (type))
4543 warning ("array type has incomplete element type");
4546 #if 0 /* We shouldn't have a function type here at all!
4547 Functions aren't allowed as array elements. */
4548 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4549 && (constp || volatilep))
4550 pedwarn ("ANSI C forbids const or volatile function types");
4553 /* Build the array type itself, then merge any constancy or
4554 volatility into the target type. We must do it in this order
4555 to ensure that the TYPE_MAIN_VARIANT field of the array type
4556 is set correctly. */
4558 type = build_array_type (type, itype);
4560 type = c_build_qualified_type (type, type_quals);
4562 #if 0 /* don't clear these; leave them set so that the array type
4563 or the variable is itself const or volatile. */
4564 type_quals = TYPE_UNQUALIFIED;
4568 C_TYPE_VARIABLE_SIZE (type) = 1;
4570 else if (TREE_CODE (declarator) == CALL_EXPR)
4572 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4573 || current_binding_level == global_binding_level);
4576 /* Declaring a function type.
4577 Make sure we have a valid type for the function to return. */
4578 if (type == error_mark_node)
4583 /* Warn about some types functions can't return. */
4585 if (TREE_CODE (type) == FUNCTION_TYPE)
4587 error ("`%s' declared as function returning a function", name);
4588 type = integer_type_node;
4590 if (TREE_CODE (type) == ARRAY_TYPE)
4592 error ("`%s' declared as function returning an array", name);
4593 type = integer_type_node;
4596 #ifndef TRADITIONAL_RETURN_FLOAT
4597 /* Traditionally, declaring return type float means double. */
4599 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4600 type = double_type_node;
4601 #endif /* TRADITIONAL_RETURN_FLOAT */
4603 /* If this is a block level extern, it must live past the end
4604 of the function so that we can check it against other extern
4605 declarations (IDENTIFIER_LIMBO_VALUE). */
4606 if (extern_ref && allocation_temporary_p ())
4607 end_temporary_allocation ();
4609 /* Construct the function type and go to the next
4610 inner layer of declarator. */
4612 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4614 /* Say it's a definition
4615 only for the CALL_EXPR
4616 closest to the identifier. */
4617 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4618 #if 0 /* This seems to be false. We turn off temporary allocation
4619 above in this function if -traditional.
4620 And this code caused inconsistent results with prototypes:
4621 callers would ignore them, and pass arguments wrong. */
4623 /* Omit the arg types if -traditional, since the arg types
4624 and the list links might not be permanent. */
4625 type = build_function_type (type,
4627 ? NULL_TREE : arg_types);
4629 /* Type qualifiers before the return type of the function
4630 qualify the return type, not the function type. */
4632 type = c_build_qualified_type (type, type_quals);
4633 type_quals = TYPE_UNQUALIFIED;
4635 type = build_function_type (type, arg_types);
4636 declarator = TREE_OPERAND (declarator, 0);
4638 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4639 the formal parameter list of this FUNCTION_TYPE to point to
4640 the FUNCTION_TYPE node itself. */
4645 for (link = last_function_parm_tags;
4647 link = TREE_CHAIN (link))
4648 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4651 else if (TREE_CODE (declarator) == INDIRECT_REF)
4653 /* Merge any constancy or volatility into the target type
4656 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4658 pedwarn ("ANSI C forbids qualified function types");
4660 type = c_build_qualified_type (type, type_quals);
4661 type_quals = TYPE_UNQUALIFIED;
4664 type = build_pointer_type (type);
4666 /* Process a list of type modifier keywords
4667 (such as const or volatile) that were given inside the `*'. */
4669 if (TREE_TYPE (declarator))
4671 register tree typemodlist;
4677 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4678 typemodlist = TREE_CHAIN (typemodlist))
4680 tree qualifier = TREE_VALUE (typemodlist);
4682 if (qualifier == ridpointers[(int) RID_CONST])
4684 else if (qualifier == ridpointers[(int) RID_VOLATILE])
4686 else if (qualifier == ridpointers[(int) RID_RESTRICT])
4691 error ("invalid type modifier within pointer declarator");
4695 pedwarn ("duplicate `const'");
4697 pedwarn ("duplicate `volatile'");
4699 pedwarn ("duplicate `restrict'");
4701 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4702 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4703 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4706 declarator = TREE_OPERAND (declarator, 0);
4713 /* Now TYPE has the actual type. */
4715 /* Did array size calculations overflow? */
4717 if (TREE_CODE (type) == ARRAY_TYPE
4719 && TREE_OVERFLOW (TYPE_SIZE (type)))
4720 error ("size of array `%s' is too large", name);
4722 /* If this is declaring a typedef name, return a TYPE_DECL. */
4724 if (specbits & (1 << (int) RID_TYPEDEF))
4727 /* Note that the grammar rejects storage classes
4728 in typenames, fields or parameters */
4729 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4731 pedwarn ("ANSI C forbids qualified function types");
4733 type = c_build_qualified_type (type, type_quals);
4734 decl = build_decl (TYPE_DECL, declarator, type);
4735 if ((specbits & (1 << (int) RID_SIGNED))
4736 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4737 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4742 /* Detect the case of an array type of unspecified size
4743 which came, as such, direct from a typedef name.
4744 We must copy the type, so that each identifier gets
4745 a distinct type, so that each identifier's size can be
4746 controlled separately by its own initializer. */
4748 if (type != 0 && typedef_type != 0
4749 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type)
4750 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0)
4752 type = build_array_type (TREE_TYPE (type), 0);
4754 C_TYPE_VARIABLE_SIZE (type) = 1;
4757 /* If this is a type name (such as, in a cast or sizeof),
4758 compute the type and return it now. */
4760 if (decl_context == TYPENAME)
4762 /* Note that the grammar rejects storage classes
4763 in typenames, fields or parameters */
4764 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4766 pedwarn ("ANSI C forbids const or volatile function types");
4768 type = c_build_qualified_type (type, type_quals);
4773 /* Aside from typedefs and type names (handle above),
4774 `void' at top level (not within pointer)
4775 is allowed only in public variables.
4776 We don't complain about parms either, but that is because
4777 a better error message can be made later. */
4779 if (TYPE_MAIN_VARIANT (type) == void_type_node && decl_context != PARM
4780 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4781 && ((specbits & (1 << (int) RID_EXTERN))
4782 || (current_binding_level == global_binding_level
4784 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4786 error ("variable or field `%s' declared void", name);
4787 type = integer_type_node;
4790 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4791 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4796 if (decl_context == PARM)
4798 tree type_as_written = type;
4801 /* A parameter declared as an array of T is really a pointer to T.
4802 One declared as a function is really a pointer to a function. */
4804 if (TREE_CODE (type) == ARRAY_TYPE)
4806 /* Transfer const-ness of array into that of type pointed to. */
4807 type = TREE_TYPE (type);
4809 type = c_build_qualified_type (type, type_quals);
4810 type = build_pointer_type (type);
4811 type_quals = TYPE_UNQUALIFIED;
4814 else if (TREE_CODE (type) == FUNCTION_TYPE)
4816 if (pedantic && type_quals)
4817 pedwarn ("ANSI C forbids qualified function types");
4819 type = c_build_qualified_type (type, type_quals);
4820 type = build_pointer_type (type);
4821 type_quals = TYPE_UNQUALIFIED;
4824 decl = build_decl (PARM_DECL, declarator, type);
4826 C_DECL_VARIABLE_SIZE (decl) = 1;
4828 /* Compute the type actually passed in the parmlist,
4829 for the case where there is no prototype.
4830 (For example, shorts and chars are passed as ints.)
4831 When there is a prototype, this is overridden later. */
4833 DECL_ARG_TYPE (decl) = type;
4834 main_type = (type == error_mark_node
4836 : TYPE_MAIN_VARIANT (type));
4837 if (main_type == float_type_node)
4838 DECL_ARG_TYPE (decl) = double_type_node;
4839 /* Don't use TYPE_PRECISION to decide whether to promote,
4840 because we should convert short if it's the same size as int,
4841 but we should not convert long if it's the same size as int. */
4842 else if (TREE_CODE (main_type) != ERROR_MARK
4843 && C_PROMOTING_INTEGER_TYPE_P (main_type))
4845 if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)
4846 && TREE_UNSIGNED (type))
4847 DECL_ARG_TYPE (decl) = unsigned_type_node;
4849 DECL_ARG_TYPE (decl) = integer_type_node;
4852 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4854 else if (decl_context == FIELD)
4856 /* Structure field. It may not be a function. */
4858 if (TREE_CODE (type) == FUNCTION_TYPE)
4860 error ("field `%s' declared as a function", name);
4861 type = build_pointer_type (type);
4863 else if (TREE_CODE (type) != ERROR_MARK && TYPE_SIZE (type) == 0)
4865 error ("field `%s' has incomplete type", name);
4866 type = error_mark_node;
4868 /* Move type qualifiers down to element of an array. */
4869 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4871 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4873 TYPE_DOMAIN (type));
4874 #if 0 /* Leave the field const or volatile as well. */
4875 type_quals = TYPE_UNQUALIFIED;
4878 decl = build_decl (FIELD_DECL, declarator, type);
4880 C_DECL_VARIABLE_SIZE (decl) = 1;
4882 else if (TREE_CODE (type) == FUNCTION_TYPE)
4884 /* Every function declaration is "external"
4885 except for those which are inside a function body
4886 in which `auto' is used.
4887 That is a case not specified by ANSI C,
4888 and we use it for forward declarations for nested functions. */
4889 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4890 || current_binding_level == global_binding_level);
4892 if (specbits & (1 << (int) RID_AUTO)
4893 && (pedantic || current_binding_level == global_binding_level))
4894 pedwarn ("invalid storage class for function `%s'", name);
4895 if (specbits & (1 << (int) RID_REGISTER))
4896 error ("invalid storage class for function `%s'", name);
4897 /* Function declaration not at top level.
4898 Storage classes other than `extern' are not allowed
4899 and `extern' makes no difference. */
4900 if (current_binding_level != global_binding_level
4901 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4903 pedwarn ("invalid storage class for function `%s'", name);
4905 /* If this is a block level extern, it must live past the end
4906 of the function so that we can check it against other
4907 extern declarations (IDENTIFIER_LIMBO_VALUE). */
4908 if (extern_ref && allocation_temporary_p ())
4909 end_temporary_allocation ();
4911 decl = build_decl (FUNCTION_DECL, declarator, type);
4912 decl = build_decl_attribute_variant (decl, decl_machine_attr);
4914 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4915 pedwarn ("ANSI C forbids qualified function types");
4918 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl))) == void_type_node
4919 && TYPE_QUALS (TREE_TYPE (TREE_TYPE (decl)))
4920 && ! DECL_IN_SYSTEM_HEADER (decl))
4921 pedwarn ("ANSI C forbids qualified void function return type");
4923 /* GNU C interprets a `volatile void' return type to indicate
4924 that the function does not return. */
4925 if ((type_quals & TYPE_QUAL_VOLATILE)
4926 && TREE_TYPE (TREE_TYPE (decl)) != void_type_node)
4927 warning ("`noreturn' function returns non-void value");
4930 DECL_EXTERNAL (decl) = 1;
4931 /* Record absence of global scope for `static' or `auto'. */
4933 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4935 /* Record presence of `inline', if it is reasonable. */
4938 if (! strcmp (IDENTIFIER_POINTER (declarator), "main"))
4939 warning ("cannot inline function `main'");
4941 /* Assume that otherwise the function can be inlined. */
4942 DECL_INLINE (decl) = 1;
4944 if (specbits & (1 << (int) RID_EXTERN))
4945 current_extern_inline = 1;
4950 /* It's a variable. */
4951 /* An uninitialized decl with `extern' is a reference. */
4952 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4954 /* Move type qualifiers down to element of an array. */
4955 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4957 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4959 TYPE_DOMAIN (type));
4960 #if 0 /* Leave the variable const or volatile as well. */
4961 type_quals = TYPE_UNQUALIFIED;
4965 /* If this is a block level extern, it must live past the end
4966 of the function so that we can check it against other
4967 extern declarations (IDENTIFIER_LIMBO_VALUE). */
4968 if (extern_ref && allocation_temporary_p ())
4969 end_temporary_allocation ();
4971 decl = build_decl (VAR_DECL, declarator, type);
4973 C_DECL_VARIABLE_SIZE (decl) = 1;
4976 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4978 DECL_EXTERNAL (decl) = extern_ref;
4979 /* At top level, the presence of a `static' or `register' storage
4980 class specifier, or the absence of all storage class specifiers
4981 makes this declaration a definition (perhaps tentative). Also,
4982 the absence of both `static' and `register' makes it public. */
4983 if (current_binding_level == global_binding_level)
4987 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
4988 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
4990 /* Not at top level, only `static' makes a static definition. */
4993 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4994 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
4997 if (specbits & 1 << (int) RID_ITERATOR)
4998 ITERATOR_P (decl) = 1;
5001 /* Record `register' declaration for warnings on &
5002 and in case doing stupid register allocation. */
5004 if (specbits & (1 << (int) RID_REGISTER))
5005 DECL_REGISTER (decl) = 1;
5007 /* Record constancy and volatility. */
5008 c_apply_type_quals_to_decl (type_quals, decl);
5010 /* If a type has volatile components, it should be stored in memory.
5011 Otherwise, the fact that those components are volatile
5012 will be ignored, and would even crash the compiler. */
5013 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
5014 mark_addressable (decl);
5022 /* Decode the parameter-list info for a function type or function definition.
5023 The argument is the value returned by `get_parm_info' (or made in parse.y
5024 if there is an identifier list instead of a parameter decl list).
5025 These two functions are separate because when a function returns
5026 or receives functions then each is called multiple times but the order
5027 of calls is different. The last call to `grokparms' is always the one
5028 that contains the formal parameter names of a function definition.
5030 Store in `last_function_parms' a chain of the decls of parms.
5031 Also store in `last_function_parm_tags' a chain of the struct, union,
5032 and enum tags declared among the parms.
5034 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5036 FUNCDEF_FLAG is nonzero for a function definition, 0 for
5037 a mere declaration. A nonempty identifier-list gets an error message
5038 when FUNCDEF_FLAG is zero. */
5041 grokparms (parms_info, funcdef_flag)
5045 tree first_parm = TREE_CHAIN (parms_info);
5047 last_function_parms = TREE_PURPOSE (parms_info);
5048 last_function_parm_tags = TREE_VALUE (parms_info);
5050 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
5051 && !in_system_header)
5052 warning ("function declaration isn't a prototype");
5055 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
5058 pedwarn ("parameter names (without types) in function declaration");
5060 last_function_parms = first_parm;
5067 /* We no longer test FUNCDEF_FLAG.
5068 If the arg types are incomplete in a declaration,
5069 they must include undefined tags.
5070 These tags can never be defined in the scope of the declaration,
5071 so the types can never be completed,
5072 and no call can be compiled successfully. */
5074 /* In a fcn definition, arg types must be complete. */
5077 for (parm = last_function_parms, typelt = first_parm;
5079 parm = TREE_CHAIN (parm))
5080 /* Skip over any enumeration constants declared here. */
5081 if (TREE_CODE (parm) == PARM_DECL)
5083 /* Barf if the parameter itself has an incomplete type. */
5084 tree type = TREE_VALUE (typelt);
5085 if (TYPE_SIZE (type) == 0)
5087 if (funcdef_flag && DECL_NAME (parm) != 0)
5088 error ("parameter `%s' has incomplete type",
5089 IDENTIFIER_POINTER (DECL_NAME (parm)));
5091 warning ("parameter has incomplete type");
5094 TREE_VALUE (typelt) = error_mark_node;
5095 TREE_TYPE (parm) = error_mark_node;
5098 #if 0 /* This has been replaced by parm_tags_warning
5099 which uses a more accurate criterion for what to warn about. */
5102 /* Now warn if is a pointer to an incomplete type. */
5103 while (TREE_CODE (type) == POINTER_TYPE
5104 || TREE_CODE (type) == REFERENCE_TYPE)
5105 type = TREE_TYPE (type);
5106 type = TYPE_MAIN_VARIANT (type);
5107 if (TYPE_SIZE (type) == 0)
5109 if (DECL_NAME (parm) != 0)
5110 warning ("parameter `%s' points to incomplete type",
5111 IDENTIFIER_POINTER (DECL_NAME (parm)));
5113 warning ("parameter points to incomplete type");
5117 typelt = TREE_CHAIN (typelt);
5120 /* Allocate the list of types the way we allocate a type. */
5121 if (first_parm && ! TREE_PERMANENT (first_parm))
5123 /* Construct a copy of the list of types
5124 on the saveable obstack. */
5126 for (typelt = first_parm; typelt; typelt = TREE_CHAIN (typelt))
5127 result = saveable_tree_cons (NULL_TREE, TREE_VALUE (typelt),
5129 return nreverse (result);
5132 /* The list we have is permanent already. */
5138 /* Return a tree_list node with info on a parameter list just parsed.
5139 The TREE_PURPOSE is a chain of decls of those parms.
5140 The TREE_VALUE is a list of structure, union and enum tags defined.
5141 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5142 This tree_list node is later fed to `grokparms'.
5144 VOID_AT_END nonzero means append `void' to the end of the type-list.
5145 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5148 get_parm_info (void_at_end)
5151 register tree decl, t;
5152 register tree types = 0;
5154 tree tags = gettags ();
5155 tree parms = getdecls ();
5157 tree order = current_binding_level->parm_order;
5159 /* Just `void' (and no ellipsis) is special. There are really no parms. */
5160 if (void_at_end && parms != 0
5161 && TREE_CHAIN (parms) == 0
5162 && TYPE_MAIN_VARIANT (TREE_TYPE (parms)) == void_type_node
5163 && DECL_NAME (parms) == 0)
5166 storedecls (NULL_TREE);
5167 return saveable_tree_cons (NULL_TREE, NULL_TREE,
5168 saveable_tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5171 /* Extract enumerator values and other non-parms declared with the parms.
5172 Likewise any forward parm decls that didn't have real parm decls. */
5173 for (decl = parms; decl; )
5175 tree next = TREE_CHAIN (decl);
5177 if (TREE_CODE (decl) != PARM_DECL)
5179 TREE_CHAIN (decl) = new_parms;
5182 else if (TREE_ASM_WRITTEN (decl))
5184 error_with_decl (decl, "parameter `%s' has just a forward declaration");
5185 TREE_CHAIN (decl) = new_parms;
5191 /* Put the parm decls back in the order they were in in the parm list. */
5192 for (t = order; t; t = TREE_CHAIN (t))
5195 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5197 TREE_CHAIN (TREE_VALUE (t)) = 0;
5200 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5203 /* Store the parmlist in the binding level since the old one
5204 is no longer a valid list. (We have changed the chain pointers.) */
5205 storedecls (new_parms);
5207 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5208 /* There may also be declarations for enumerators if an enumeration
5209 type is declared among the parms. Ignore them here. */
5210 if (TREE_CODE (decl) == PARM_DECL)
5212 /* Since there is a prototype,
5213 args are passed in their declared types. */
5214 tree type = TREE_TYPE (decl);
5215 DECL_ARG_TYPE (decl) = type;
5216 #ifdef PROMOTE_PROTOTYPES
5217 if ((TREE_CODE (type) == INTEGER_TYPE
5218 || TREE_CODE (type) == ENUMERAL_TYPE)
5219 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5220 DECL_ARG_TYPE (decl) = integer_type_node;
5223 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5224 if (TYPE_MAIN_VARIANT (TREE_VALUE (types)) == void_type_node && ! erred
5225 && DECL_NAME (decl) == 0)
5227 error ("`void' in parameter list must be the entire list");
5233 return saveable_tree_cons (new_parms, tags,
5234 nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types)));
5236 return saveable_tree_cons (new_parms, tags, nreverse (types));
5239 /* At end of parameter list, warn about any struct, union or enum tags
5240 defined within. Do so because these types cannot ever become complete. */
5243 parmlist_tags_warning ()
5248 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5250 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5251 /* An anonymous union parm type is meaningful as a GNU extension.
5252 So don't warn for that. */
5253 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5255 if (TREE_PURPOSE (elt) != 0)
5256 warning ("`%s %s' declared inside parameter list",
5257 (code == RECORD_TYPE ? "struct"
5258 : code == UNION_TYPE ? "union"
5260 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5262 warning ("anonymous %s declared inside parameter list",
5263 (code == RECORD_TYPE ? "struct"
5264 : code == UNION_TYPE ? "union"
5269 warning ("its scope is only this definition or declaration, which is probably not what you want.");
5275 /* Get the struct, enum or union (CODE says which) with tag NAME.
5276 Define the tag as a forward-reference if it is not defined. */
5279 xref_tag (code, name)
5280 enum tree_code code;
5283 int temporary = allocation_temporary_p ();
5285 /* If a cross reference is requested, look up the type
5286 already defined for this tag and return it. */
5288 register tree ref = lookup_tag (code, name, current_binding_level, 0);
5289 /* Even if this is the wrong type of tag, return what we found.
5290 There will be an error message anyway, from pending_xref_error.
5291 If we create an empty xref just for an invalid use of the type,
5292 the main result is to create lots of superfluous error messages. */
5296 push_obstacks_nochange ();
5298 if (current_binding_level == global_binding_level && temporary)
5299 end_temporary_allocation ();
5301 /* If no such tag is yet defined, create a forward-reference node
5302 and record it as the "definition".
5303 When a real declaration of this type is found,
5304 the forward-reference will be altered into a real type. */
5306 ref = make_node (code);
5307 if (code == ENUMERAL_TYPE)
5309 /* (In ANSI, Enums can be referred to only if already defined.) */
5311 pedwarn ("ANSI C forbids forward references to `enum' types");
5312 /* Give the type a default layout like unsigned int
5313 to avoid crashing if it does not get defined. */
5314 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5315 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5316 TREE_UNSIGNED (ref) = 1;
5317 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5318 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5319 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5322 pushtag (name, ref);
5329 /* Make sure that the tag NAME is defined *in the current binding level*
5330 at least as a forward reference.
5331 CODE says which kind of tag NAME ought to be.
5333 We also do a push_obstacks_nochange
5334 whose matching pop is in finish_struct. */
5337 start_struct (code, name)
5338 enum tree_code code;
5341 /* If there is already a tag defined at this binding level
5342 (as a forward reference), just return it. */
5344 register tree ref = 0;
5346 push_obstacks_nochange ();
5347 if (current_binding_level == global_binding_level)
5348 end_temporary_allocation ();
5351 ref = lookup_tag (code, name, current_binding_level, 1);
5352 if (ref && TREE_CODE (ref) == code)
5354 C_TYPE_BEING_DEFINED (ref) = 1;
5355 TYPE_PACKED (ref) = flag_pack_struct;
5356 if (TYPE_FIELDS (ref))
5357 error ((code == UNION_TYPE ? "redefinition of `union %s'"
5358 : "redefinition of `struct %s'"),
5359 IDENTIFIER_POINTER (name));
5364 /* Otherwise create a forward-reference just so the tag is in scope. */
5366 ref = make_node (code);
5367 pushtag (name, ref);
5368 C_TYPE_BEING_DEFINED (ref) = 1;
5369 TYPE_PACKED (ref) = flag_pack_struct;
5373 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5374 of a structure component, returning a FIELD_DECL node.
5375 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5377 This is done during the parsing of the struct declaration.
5378 The FIELD_DECL nodes are chained together and the lot of them
5379 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5382 grokfield (filename, line, declarator, declspecs, width)
5383 const char *filename ATTRIBUTE_UNUSED;
5384 int line ATTRIBUTE_UNUSED;
5385 tree declarator, declspecs, width;
5389 /* The corresponding pop_obstacks is in finish_decl. */
5390 push_obstacks_nochange ();
5392 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5394 finish_decl (value, NULL_TREE, NULL_TREE);
5395 DECL_INITIAL (value) = width;
5397 maybe_objc_check_decl (value);
5401 /* Function to help qsort sort FIELD_DECLs by name order. */
5404 field_decl_cmp (xp, yp)
5405 const GENERIC_PTR xp;
5406 const GENERIC_PTR yp;
5408 tree *x = (tree *)xp, *y = (tree *)yp;
5410 if (DECL_NAME (*x) == DECL_NAME (*y))
5412 if (DECL_NAME (*x) == NULL)
5414 if (DECL_NAME (*y) == NULL)
5416 if (DECL_NAME (*x) < DECL_NAME (*y))
5421 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5422 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5423 ATTRIBUTES are attributes to be applied to the structure.
5425 We also do a pop_obstacks to match the push in start_struct. */
5428 finish_struct (t, fieldlist, attributes)
5435 int toplevel = global_binding_level == current_binding_level;
5437 /* If this type was previously laid out as a forward reference,
5438 make sure we lay it out again. */
5442 decl_attributes (t, attributes, NULL_TREE);
5444 /* Nameless union parm types are useful as GCC extension. */
5445 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5446 /* Otherwise, warn about any struct or union def. in parmlist. */
5447 if (in_parm_level_p ())
5450 pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5451 : "structure defined inside parms"));
5452 else if (! flag_traditional)
5453 warning ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5454 : "structure defined inside parms"));
5457 old_momentary = suspend_momentary ();
5461 for (x = fieldlist; x; x = TREE_CHAIN (x))
5462 if (DECL_NAME (x) != 0)
5467 ? "%s has no named members"
5468 : "%s has no members"),
5469 TREE_CODE (t) == UNION_TYPE ? "union" : "struct");
5472 /* Install struct as DECL_CONTEXT of each field decl.
5473 Also process specified field sizes.
5474 Set DECL_FIELD_SIZE to the specified size, or 0 if none specified.
5475 The specified size is found in the DECL_INITIAL.
5476 Store 0 there, except for ": 0" fields (so we can find them
5477 and delete them, below). */
5479 for (x = fieldlist; x; x = TREE_CHAIN (x))
5481 DECL_CONTEXT (x) = t;
5482 DECL_PACKED (x) |= TYPE_PACKED (t);
5483 DECL_FIELD_SIZE (x) = 0;
5485 /* If any field is const, the structure type is pseudo-const. */
5486 if (TREE_READONLY (x))
5487 C_TYPE_FIELDS_READONLY (t) = 1;
5490 /* A field that is pseudo-const makes the structure likewise. */
5491 tree t1 = TREE_TYPE (x);
5492 while (TREE_CODE (t1) == ARRAY_TYPE)
5493 t1 = TREE_TYPE (t1);
5494 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5495 && C_TYPE_FIELDS_READONLY (t1))
5496 C_TYPE_FIELDS_READONLY (t) = 1;
5499 /* Any field that is volatile means variables of this type must be
5500 treated in some ways as volatile. */
5501 if (TREE_THIS_VOLATILE (x))
5502 C_TYPE_FIELDS_VOLATILE (t) = 1;
5504 /* Any field of nominal variable size implies structure is too. */
5505 if (C_DECL_VARIABLE_SIZE (x))
5506 C_TYPE_VARIABLE_SIZE (t) = 1;
5508 /* Detect invalid nested redefinition. */
5509 if (TREE_TYPE (x) == t)
5510 error ("nested redefinition of `%s'",
5511 IDENTIFIER_POINTER (TYPE_NAME (t)));
5513 /* Detect invalid bit-field size. */
5514 if (DECL_INITIAL (x))
5515 STRIP_NOPS (DECL_INITIAL (x));
5516 if (DECL_INITIAL (x))
5518 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5519 constant_expression_warning (DECL_INITIAL (x));
5522 error_with_decl (x, "bit-field `%s' width not an integer constant");
5523 DECL_INITIAL (x) = NULL;
5527 /* Detect invalid bit-field type. */
5528 if (DECL_INITIAL (x)
5529 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5530 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5532 error_with_decl (x, "bit-field `%s' has invalid type");
5533 DECL_INITIAL (x) = NULL;
5535 if (DECL_INITIAL (x) && pedantic
5536 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5537 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5538 /* Accept an enum that's equivalent to int or unsigned int. */
5539 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5540 && (TYPE_PRECISION (TREE_TYPE (x))
5541 == TYPE_PRECISION (integer_type_node))))
5542 pedwarn_with_decl (x, "bit-field `%s' type invalid in ANSI C");
5544 /* Detect and ignore out of range field width. */
5545 if (DECL_INITIAL (x))
5547 unsigned HOST_WIDE_INT width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5549 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5551 DECL_INITIAL (x) = NULL;
5552 error_with_decl (x, "negative width in bit-field `%s'");
5554 else if (TREE_INT_CST_HIGH (DECL_INITIAL (x)) != 0
5555 || width > TYPE_PRECISION (TREE_TYPE (x)))
5557 DECL_INITIAL (x) = NULL;
5558 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5560 else if (width == 0 && DECL_NAME (x) != 0)
5562 error_with_decl (x, "zero width for bit-field `%s'");
5563 DECL_INITIAL (x) = NULL;
5567 /* Process valid field width. */
5568 if (DECL_INITIAL (x))
5570 register int width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5572 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5573 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5574 TREE_UNSIGNED (TREE_TYPE (x)))
5575 || width < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5576 TREE_UNSIGNED (TREE_TYPE (x)))))
5577 warning_with_decl (x, "`%s' is narrower than values of its type");
5579 DECL_FIELD_SIZE (x) = width;
5580 DECL_BIT_FIELD (x) = DECL_C_BIT_FIELD (x) = 1;
5581 DECL_INITIAL (x) = NULL;
5585 /* field size 0 => force desired amount of alignment. */
5586 #ifdef EMPTY_FIELD_BOUNDARY
5587 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5589 #ifdef PCC_BITFIELD_TYPE_MATTERS
5590 if (PCC_BITFIELD_TYPE_MATTERS)
5591 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5592 TYPE_ALIGN (TREE_TYPE (x)));
5596 else if (TREE_TYPE (x) != error_mark_node)
5598 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5599 : TYPE_ALIGN (TREE_TYPE (x)));
5600 /* Non-bit-fields are aligned for their type, except packed
5601 fields which require only BITS_PER_UNIT alignment. */
5602 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5606 /* Now DECL_INITIAL is null on all members. */
5608 /* Delete all duplicate fields from the fieldlist */
5609 for (x = fieldlist; x && TREE_CHAIN (x);)
5610 /* Anonymous fields aren't duplicates. */
5611 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5615 register tree y = fieldlist;
5619 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5625 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5627 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5628 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5630 else x = TREE_CHAIN (x);
5633 /* Now we have the nearly final fieldlist. Record it,
5634 then lay out the structure or union (including the fields). */
5636 TYPE_FIELDS (t) = fieldlist;
5640 /* Delete all zero-width bit-fields from the front of the fieldlist */
5642 && DECL_INITIAL (fieldlist))
5643 fieldlist = TREE_CHAIN (fieldlist);
5644 /* Delete all such members from the rest of the fieldlist */
5645 for (x = fieldlist; x;)
5647 if (TREE_CHAIN (x) && DECL_INITIAL (TREE_CHAIN (x)))
5648 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5649 else x = TREE_CHAIN (x);
5652 /* Now we have the truly final field list.
5653 Store it in this type and in the variants. */
5655 TYPE_FIELDS (t) = fieldlist;
5657 /* If there are lots of fields, sort so we can look through them fast.
5658 We arbitrarily consider 16 or more elts to be "a lot". */
5662 for (x = fieldlist; x; x = TREE_CHAIN (x))
5673 len += list_length (x);
5674 /* Use the same allocation policy here that make_node uses, to
5675 ensure that this lives as long as the rest of the struct decl.
5676 All decls in an inline function need to be saved. */
5677 if (allocation_temporary_p ())
5678 space = savealloc (sizeof (struct lang_type) + len * sizeof (tree));
5680 space = oballoc (sizeof (struct lang_type) + len * sizeof (tree));
5682 TYPE_LANG_SPECIFIC (t) = (struct lang_type *) space;
5683 TYPE_LANG_SPECIFIC (t)->len = len;
5685 field_array = &TYPE_LANG_SPECIFIC (t)->elts[0];
5687 for (x = fieldlist; x; x = TREE_CHAIN (x))
5688 field_array[len++] = x;
5690 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5694 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5696 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5697 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5698 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5701 /* If this was supposed to be a transparent union, but we can't
5702 make it one, warn and turn off the flag. */
5703 if (TREE_CODE (t) == UNION_TYPE
5704 && TYPE_TRANSPARENT_UNION (t)
5705 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5707 TYPE_TRANSPARENT_UNION (t) = 0;
5708 warning ("union cannot be made transparent");
5711 /* If this structure or union completes the type of any previous
5712 variable declaration, lay it out and output its rtl. */
5714 if (current_binding_level->n_incomplete != 0)
5717 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5719 if (TREE_TYPE (decl) == t
5720 && TREE_CODE (decl) != TYPE_DECL)
5722 layout_decl (decl, 0);
5723 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5724 maybe_objc_check_decl (decl);
5725 rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0);
5728 --current_binding_level->n_incomplete;
5730 else if (TYPE_SIZE (TREE_TYPE (decl)) == 0
5731 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5733 tree element = TREE_TYPE (decl);
5734 while (TREE_CODE (element) == ARRAY_TYPE)
5735 element = TREE_TYPE (element);
5737 layout_array_type (TREE_TYPE (decl));
5742 resume_momentary (old_momentary);
5744 /* Finish debugging output for this type. */
5745 rest_of_type_compilation (t, toplevel);
5747 /* The matching push is in start_struct. */
5753 /* Lay out the type T, and its element type, and so on. */
5756 layout_array_type (t)
5759 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5760 layout_array_type (TREE_TYPE (t));
5764 /* Begin compiling the definition of an enumeration type.
5765 NAME is its name (or null if anonymous).
5766 Returns the type object, as yet incomplete.
5767 Also records info about it so that build_enumerator
5768 may be used to declare the individual values as they are read. */
5774 register tree enumtype = 0;
5776 /* If this is the real definition for a previous forward reference,
5777 fill in the contents in the same object that used to be the
5778 forward reference. */
5781 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5783 /* The corresponding pop_obstacks is in finish_enum. */
5784 push_obstacks_nochange ();
5785 /* If these symbols and types are global, make them permanent. */
5786 if (current_binding_level == global_binding_level)
5787 end_temporary_allocation ();
5789 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5791 enumtype = make_node (ENUMERAL_TYPE);
5792 pushtag (name, enumtype);
5795 C_TYPE_BEING_DEFINED (enumtype) = 1;
5797 if (TYPE_VALUES (enumtype) != 0)
5799 /* This enum is a named one that has been declared already. */
5800 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5802 /* Completely replace its old definition.
5803 The old enumerators remain defined, however. */
5804 TYPE_VALUES (enumtype) = 0;
5807 enum_next_value = integer_zero_node;
5810 if (flag_short_enums)
5811 TYPE_PACKED (enumtype) = 1;
5816 /* After processing and defining all the values of an enumeration type,
5817 install their decls in the enumeration type and finish it off.
5818 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5819 and ATTRIBUTES are the specified attributes.
5820 Returns ENUMTYPE. */
5823 finish_enum (enumtype, values, attributes)
5828 register tree pair, tem;
5829 tree minnode = 0, maxnode = 0;
5830 int lowprec, highprec, precision;
5831 int toplevel = global_binding_level == current_binding_level;
5833 if (in_parm_level_p ())
5834 warning ("enum defined inside parms");
5836 decl_attributes (enumtype, attributes, NULL_TREE);
5838 /* Calculate the maximum value of any enumerator in this type. */
5840 if (values == error_mark_node)
5841 minnode = maxnode = integer_zero_node;
5843 for (pair = values; pair; pair = TREE_CHAIN (pair))
5845 tree value = TREE_VALUE (pair);
5847 minnode = maxnode = TREE_VALUE (pair);
5850 if (tree_int_cst_lt (maxnode, value))
5852 if (tree_int_cst_lt (value, minnode))
5857 TYPE_MIN_VALUE (enumtype) = minnode;
5858 TYPE_MAX_VALUE (enumtype) = maxnode;
5860 /* An enum can have some negative values; then it is signed. */
5861 TREE_UNSIGNED (enumtype) = tree_int_cst_sgn (minnode) >= 0;
5863 /* Determine the precision this type needs. */
5865 lowprec = min_precision (minnode, TREE_UNSIGNED (enumtype));
5866 highprec = min_precision (maxnode, TREE_UNSIGNED (enumtype));
5867 precision = MAX (lowprec, highprec);
5869 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5871 tree narrowest = type_for_size (precision, 1);
5874 warning ("enumeration values exceed range of largest integer");
5875 narrowest = long_long_integer_type_node;
5878 TYPE_PRECISION (enumtype) = TYPE_PRECISION (narrowest);
5881 TYPE_PRECISION (enumtype) = TYPE_PRECISION (integer_type_node);
5883 TYPE_SIZE (enumtype) = 0;
5884 layout_type (enumtype);
5886 if (values != error_mark_node)
5888 /* Change the type of the enumerators to be the enum type.
5889 Formerly this was done only for enums that fit in an int,
5890 but the comment said it was done only for enums wider than int.
5891 It seems necessary to do this for wide enums,
5892 and best not to change what's done for ordinary narrower ones. */
5893 for (pair = values; pair; pair = TREE_CHAIN (pair))
5895 TREE_TYPE (TREE_PURPOSE (pair)) = enumtype;
5896 DECL_SIZE (TREE_PURPOSE (pair)) = TYPE_SIZE (enumtype);
5897 if (TREE_CODE (TREE_PURPOSE (pair)) != FUNCTION_DECL)
5898 DECL_ALIGN (TREE_PURPOSE (pair)) = TYPE_ALIGN (enumtype);
5901 /* Replace the decl nodes in VALUES with their names. */
5902 for (pair = values; pair; pair = TREE_CHAIN (pair))
5903 TREE_PURPOSE (pair) = DECL_NAME (TREE_PURPOSE (pair));
5905 TYPE_VALUES (enumtype) = values;
5908 /* Fix up all variant types of this enum type. */
5909 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5911 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5912 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5913 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5914 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5915 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5916 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5917 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5918 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5919 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5922 /* Finish debugging output for this type. */
5923 rest_of_type_compilation (enumtype, toplevel);
5925 /* This matches a push in start_enum. */
5931 /* Build and install a CONST_DECL for one value of the
5932 current enumeration type (one that was begun with start_enum).
5933 Return a tree-list containing the CONST_DECL and its value.
5934 Assignment of sequential values by default is handled here. */
5937 build_enumerator (name, value)
5940 register tree decl, type;
5942 /* Validate and default VALUE. */
5944 /* Remove no-op casts from the value. */
5946 STRIP_TYPE_NOPS (value);
5950 if (TREE_CODE (value) == INTEGER_CST)
5952 value = default_conversion (value);
5953 constant_expression_warning (value);
5957 error ("enumerator value for `%s' not integer constant",
5958 IDENTIFIER_POINTER (name));
5963 /* Default based on previous value. */
5964 /* It should no longer be possible to have NON_LVALUE_EXPR
5968 value = enum_next_value;
5970 error ("overflow in enumeration values");
5973 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5975 pedwarn ("ANSI C restricts enumerator values to range of `int'");
5976 value = integer_zero_node;
5979 /* Set basis for default for next value. */
5980 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5981 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5983 /* Now create a declaration for the enum value name. */
5985 type = TREE_TYPE (value);
5986 type = type_for_size (MAX (TYPE_PRECISION (type),
5987 TYPE_PRECISION (integer_type_node)),
5989 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
5990 && TREE_UNSIGNED (type)));
5992 decl = build_decl (CONST_DECL, name, type);
5993 DECL_INITIAL (decl) = value;
5994 TREE_TYPE (value) = type;
5997 return saveable_tree_cons (decl, value, NULL_TREE);
6000 /* Create the FUNCTION_DECL for a function definition.
6001 DECLSPECS, DECLARATOR, PREFIX_ATTRIBUTES and ATTRIBUTES are the parts of
6002 the declaration; they describe the function's name and the type it returns,
6003 but twisted together in a fashion that parallels the syntax of C.
6005 This function creates a binding context for the function body
6006 as well as setting up the FUNCTION_DECL in current_function_decl.
6008 Returns 1 on success. If the DECLARATOR is not suitable for a function
6009 (it defines a datum instead), we return 0, which tells
6010 yyparse to report a parse error.
6012 NESTED is nonzero for a function nested within another function. */
6015 start_function (declspecs, declarator, prefix_attributes, attributes, nested)
6016 tree declarator, declspecs, prefix_attributes, attributes;
6019 tree decl1, old_decl;
6021 int old_immediate_size_expand = immediate_size_expand;
6023 current_function_returns_value = 0; /* Assume, until we see it does. */
6024 current_function_returns_null = 0;
6025 warn_about_return_type = 0;
6026 current_extern_inline = 0;
6027 c_function_varargs = 0;
6029 shadowed_labels = 0;
6031 /* Don't expand any sizes in the return type of the function. */
6032 immediate_size_expand = 0;
6034 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
6036 /* If the declarator is not suitable for a function definition,
6037 cause a syntax error. */
6040 immediate_size_expand = old_immediate_size_expand;
6044 decl_attributes (decl1, prefix_attributes, attributes);
6046 announce_function (decl1);
6048 if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl1))) == 0)
6050 error ("return-type is an incomplete type");
6051 /* Make it return void instead. */
6053 = build_function_type (void_type_node,
6054 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
6057 if (warn_about_return_type)
6058 warning ("return-type defaults to `int'");
6060 /* Save the parm names or decls from this function's declarator
6061 where store_parm_decls will find them. */
6062 current_function_parms = last_function_parms;
6063 current_function_parm_tags = last_function_parm_tags;
6065 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6066 error_mark_node is replaced below (in poplevel) with the BLOCK. */
6067 DECL_INITIAL (decl1) = error_mark_node;
6069 /* If this definition isn't a prototype and we had a prototype declaration
6070 before, copy the arg type info from that prototype.
6071 But not if what we had before was a builtin function. */
6072 old_decl = lookup_name_current_level (DECL_NAME (decl1));
6073 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
6074 && !DECL_BUILT_IN (old_decl)
6075 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6076 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
6077 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
6079 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
6080 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
6081 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
6084 /* If there is no explicit declaration, look for any out-of-scope implicit
6087 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
6089 /* Optionally warn of old-fashioned def with no previous prototype. */
6090 if (warn_strict_prototypes
6091 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6092 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
6093 warning ("function declaration isn't a prototype");
6094 /* Optionally warn of any global def with no previous prototype. */
6095 else if (warn_missing_prototypes
6096 && TREE_PUBLIC (decl1)
6097 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0)
6098 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
6099 warning_with_decl (decl1, "no previous prototype for `%s'");
6100 /* Optionally warn of any def with no previous prototype
6101 if the function has already been used. */
6102 else if (warn_missing_prototypes
6103 && old_decl != 0 && TREE_USED (old_decl)
6104 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6105 warning_with_decl (decl1,
6106 "`%s' was used with no prototype before its definition");
6107 /* Optionally warn of any global def with no previous declaration. */
6108 else if (warn_missing_declarations
6109 && TREE_PUBLIC (decl1)
6111 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
6112 warning_with_decl (decl1, "no previous declaration for `%s'");
6113 /* Optionally warn of any def with no previous declaration
6114 if the function has already been used. */
6115 else if (warn_missing_declarations
6116 && old_decl != 0 && TREE_USED (old_decl)
6117 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
6118 warning_with_decl (decl1,
6119 "`%s' was used with no declaration before its definition");
6121 /* This is a definition, not a reference.
6122 So normally clear DECL_EXTERNAL.
6123 However, `extern inline' acts like a declaration
6124 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6125 DECL_EXTERNAL (decl1) = current_extern_inline;
6127 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
6128 SET_DEFAULT_DECL_ATTRIBUTES (decl1, attributes);
6131 /* This function exists in static storage.
6132 (This does not mean `static' in the C sense!) */
6133 TREE_STATIC (decl1) = 1;
6135 /* A nested function is not global. */
6136 if (current_function_decl != 0)
6137 TREE_PUBLIC (decl1) = 0;
6139 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6141 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))) == 0)
6146 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6147 != integer_type_node)
6148 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
6150 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
6151 args = TREE_CHAIN (args))
6153 tree type = args ? TREE_VALUE (args) : 0;
6155 if (type == void_type_node)
6162 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6163 pedwarn_with_decl (decl1,
6164 "first argument of `%s' should be `int'");
6168 if (TREE_CODE (type) != POINTER_TYPE
6169 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6170 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6172 pedwarn_with_decl (decl1,
6173 "second argument of `%s' should be `char **'");
6177 if (TREE_CODE (type) != POINTER_TYPE
6178 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6179 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6181 pedwarn_with_decl (decl1,
6182 "third argument of `%s' should probably be `char **'");
6187 /* It is intentional that this message does not mention the third
6188 argument, which is warned for only pedantically, because it's
6189 blessed by mention in an appendix of the standard. */
6190 if (argct > 0 && (argct < 2 || argct > 3))
6191 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
6193 if (argct == 3 && pedantic)
6194 pedwarn_with_decl (decl1, "third argument of `%s' is deprecated");
6196 if (! TREE_PUBLIC (decl1))
6197 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
6200 /* Record the decl so that the function name is defined.
6201 If we already have a decl for this name, and it is a FUNCTION_DECL,
6202 use the old decl. */
6204 current_function_decl = pushdecl (decl1);
6207 declare_parm_level (1);
6208 current_binding_level->subblocks_tag_transparent = 1;
6210 make_function_rtl (current_function_decl);
6212 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6213 /* Promote the value to int before returning it. */
6214 if (C_PROMOTING_INTEGER_TYPE_P (restype))
6216 /* It retains unsignedness if traditional
6217 or if not really getting wider. */
6218 if (TREE_UNSIGNED (restype)
6219 && (flag_traditional
6220 || (TYPE_PRECISION (restype)
6221 == TYPE_PRECISION (integer_type_node))))
6222 restype = unsigned_type_node;
6224 restype = integer_type_node;
6226 DECL_RESULT (current_function_decl)
6227 = build_decl (RESULT_DECL, NULL_TREE, restype);
6230 /* Allocate further tree nodes temporarily during compilation
6231 of this function only. */
6232 temporary_allocation ();
6234 /* If this fcn was already referenced via a block-scope `extern' decl
6235 (or an implicit decl), propagate certain information about the usage. */
6236 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6237 TREE_ADDRESSABLE (current_function_decl) = 1;
6239 immediate_size_expand = old_immediate_size_expand;
6244 /* Record that this function is going to be a varargs function.
6245 This is called before store_parm_decls, which is too early
6246 to call mark_varargs directly. */
6251 c_function_varargs = 1;
6254 /* Store the parameter declarations into the current function declaration.
6255 This is called after parsing the parameter declarations, before
6256 digesting the body of the function.
6258 For an old-style definition, modify the function's type
6259 to specify at least the number of arguments. */
6264 register tree fndecl = current_function_decl;
6267 /* This is either a chain of PARM_DECLs (if a prototype was used)
6268 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6269 tree specparms = current_function_parms;
6271 /* This is a list of types declared among parms in a prototype. */
6272 tree parmtags = current_function_parm_tags;
6274 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6275 register tree parmdecls = getdecls ();
6277 /* This is a chain of any other decls that came in among the parm
6278 declarations. If a parm is declared with enum {foo, bar} x;
6279 then CONST_DECLs for foo and bar are put here. */
6282 /* Nonzero if this definition is written with a prototype. */
6285 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6287 /* This case is when the function was defined with an ANSI prototype.
6288 The parms already have decls, so we need not do anything here
6289 except record them as in effect
6290 and complain if any redundant old-style parm decls were written. */
6301 error_with_decl (fndecl,
6302 "parm types given both in parmlist and separately");
6303 /* Get rid of the erroneous decls; don't keep them on
6304 the list of parms, since they might not be PARM_DECLs. */
6305 for (decl = current_binding_level->names;
6306 decl; decl = TREE_CHAIN (decl))
6307 if (DECL_NAME (decl))
6308 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6309 for (link = current_binding_level->shadowed;
6310 link; link = TREE_CHAIN (link))
6311 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6312 current_binding_level->names = 0;
6313 current_binding_level->shadowed = 0;
6316 specparms = nreverse (specparms);
6317 for (parm = specparms; parm; parm = next)
6319 next = TREE_CHAIN (parm);
6320 if (TREE_CODE (parm) == PARM_DECL)
6322 if (DECL_NAME (parm) == 0)
6323 error_with_decl (parm, "parameter name omitted");
6324 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6326 error_with_decl (parm, "parameter `%s' declared void");
6327 /* Change the type to error_mark_node so this parameter
6328 will be ignored by assign_parms. */
6329 TREE_TYPE (parm) = error_mark_node;
6335 /* If we find an enum constant or a type tag,
6336 put it aside for the moment. */
6337 TREE_CHAIN (parm) = 0;
6338 others = chainon (others, parm);
6342 /* Get the decls in their original chain order
6343 and record in the function. */
6344 DECL_ARGUMENTS (fndecl) = getdecls ();
6347 /* If this function takes a variable number of arguments,
6348 add a phony parameter to the end of the parm list,
6349 to represent the position of the first unnamed argument. */
6350 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6353 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6354 /* Let's hope the address of the unnamed parm
6355 won't depend on its type. */
6356 TREE_TYPE (dummy) = integer_type_node;
6357 DECL_ARG_TYPE (dummy) = integer_type_node;
6358 DECL_ARGUMENTS (fndecl)
6359 = chainon (DECL_ARGUMENTS (fndecl), dummy);
6363 /* Now pushdecl the enum constants. */
6364 for (parm = others; parm; parm = next)
6366 next = TREE_CHAIN (parm);
6367 if (DECL_NAME (parm) == 0)
6369 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6371 else if (TREE_CODE (parm) != PARM_DECL)
6375 storetags (chainon (parmtags, gettags ()));
6379 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6380 each with a parm name as the TREE_VALUE.
6382 PARMDECLS is a chain of declarations for parameters.
6383 Warning! It can also contain CONST_DECLs which are not parameters
6384 but are names of enumerators of any enum types
6385 declared among the parameters.
6387 First match each formal parameter name with its declaration.
6388 Associate decls with the names and store the decls
6389 into the TREE_PURPOSE slots. */
6391 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6392 DECL_RESULT (parm) = 0;
6394 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6396 register tree tail, found = NULL;
6398 if (TREE_VALUE (parm) == 0)
6400 error_with_decl (fndecl, "parameter name missing from parameter list");
6401 TREE_PURPOSE (parm) = 0;
6405 /* See if any of the parmdecls specifies this parm by name.
6406 Ignore any enumerator decls. */
6407 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6408 if (DECL_NAME (tail) == TREE_VALUE (parm)
6409 && TREE_CODE (tail) == PARM_DECL)
6415 /* If declaration already marked, we have a duplicate name.
6416 Complain, and don't use this decl twice. */
6417 if (found && DECL_RESULT (found) != 0)
6419 error_with_decl (found, "multiple parameters named `%s'");
6423 /* If the declaration says "void", complain and ignore it. */
6424 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6426 error_with_decl (found, "parameter `%s' declared void");
6427 TREE_TYPE (found) = integer_type_node;
6428 DECL_ARG_TYPE (found) = integer_type_node;
6429 layout_decl (found, 0);
6432 /* Traditionally, a parm declared float is actually a double. */
6433 if (found && flag_traditional
6434 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6436 TREE_TYPE (found) = double_type_node;
6437 DECL_ARG_TYPE (found) = double_type_node;
6438 layout_decl (found, 0);
6441 /* If no declaration found, default to int. */
6444 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6446 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6447 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6448 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6450 warning_with_decl (found, "type of `%s' defaults to `int'");
6454 TREE_PURPOSE (parm) = found;
6456 /* Mark this decl as "already found" -- see test, above.
6457 It is safe to use DECL_RESULT for this
6458 since it is not used in PARM_DECLs or CONST_DECLs. */
6459 DECL_RESULT (found) = error_mark_node;
6462 /* Put anything which is on the parmdecls chain and which is
6463 not a PARM_DECL onto the list NONPARMS. (The types of
6464 non-parm things which might appear on the list include
6465 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6466 any actual PARM_DECLs not matched with any names. */
6469 for (parm = parmdecls; parm; )
6471 tree next = TREE_CHAIN (parm);
6472 TREE_CHAIN (parm) = 0;
6474 if (TREE_CODE (parm) != PARM_DECL)
6475 nonparms = chainon (nonparms, parm);
6478 /* Complain about args with incomplete types. */
6479 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6481 error_with_decl (parm, "parameter `%s' has incomplete type");
6482 TREE_TYPE (parm) = error_mark_node;
6485 if (DECL_RESULT (parm) == 0)
6487 error_with_decl (parm,
6488 "declaration for parameter `%s' but no such parameter");
6489 /* Pretend the parameter was not missing.
6490 This gets us to a standard state and minimizes
6491 further error messages. */
6493 = chainon (specparms,
6494 tree_cons (parm, NULL_TREE, NULL_TREE));
6501 /* Chain the declarations together in the order of the list of names. */
6502 /* Store that chain in the function decl, replacing the list of names. */
6504 DECL_ARGUMENTS (fndecl) = 0;
6507 for (last = 0; parm; parm = TREE_CHAIN (parm))
6508 if (TREE_PURPOSE (parm))
6511 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6513 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6514 last = TREE_PURPOSE (parm);
6515 TREE_CHAIN (last) = 0;
6519 /* If there was a previous prototype,
6520 set the DECL_ARG_TYPE of each argument according to
6521 the type previously specified, and report any mismatches. */
6523 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6526 for (parm = DECL_ARGUMENTS (fndecl),
6527 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6528 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6529 != void_type_node));
6530 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6532 if (parm == 0 || type == 0
6533 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6535 error ("number of arguments doesn't match prototype");
6536 error_with_file_and_line (current_function_prototype_file,
6537 current_function_prototype_line,
6538 "prototype declaration");
6541 /* Type for passing arg must be consistent
6542 with that declared for the arg. */
6543 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
6545 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6546 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6548 /* Adjust argument to match prototype. E.g. a previous
6549 `int foo(float);' prototype causes
6550 `int foo(x) float x; {...}' to be treated like
6551 `int foo(float x) {...}'. This is particularly
6552 useful for argument types like uid_t. */
6553 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6554 #ifdef PROMOTE_PROTOTYPES
6555 if ((TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
6556 || TREE_CODE (TREE_TYPE (parm)) == ENUMERAL_TYPE)
6557 && TYPE_PRECISION (TREE_TYPE (parm))
6558 < TYPE_PRECISION (integer_type_node))
6559 DECL_ARG_TYPE (parm) = integer_type_node;
6563 pedwarn ("promoted argument `%s' doesn't match prototype",
6564 IDENTIFIER_POINTER (DECL_NAME (parm)));
6565 warning_with_file_and_line
6566 (current_function_prototype_file,
6567 current_function_prototype_line,
6568 "prototype declaration");
6571 /* If -traditional, allow `int' argument to match
6572 `unsigned' prototype. */
6573 else if (! (flag_traditional
6574 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6575 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6577 error ("argument `%s' doesn't match prototype",
6578 IDENTIFIER_POINTER (DECL_NAME (parm)));
6579 error_with_file_and_line (current_function_prototype_file,
6580 current_function_prototype_line,
6581 "prototype declaration");
6585 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6588 /* Otherwise, create a prototype that would match. */
6592 tree actual = 0, last = 0, type;
6594 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6596 type = perm_tree_cons (NULL_TREE, DECL_ARG_TYPE (parm),
6599 TREE_CHAIN (last) = type;
6604 type = perm_tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6606 TREE_CHAIN (last) = type;
6610 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6611 of the type of this function, but we need to avoid having this
6612 affect the types of other similarly-typed functions, so we must
6613 first force the generation of an identical (but separate) type
6614 node for the relevant function type. The new node we create
6615 will be a variant of the main variant of the original function
6618 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6620 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6623 /* Now store the final chain of decls for the arguments
6624 as the decl-chain of the current lexical scope.
6625 Put the enumerators in as well, at the front so that
6626 DECL_ARGUMENTS is not modified. */
6628 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6631 /* Make sure the binding level for the top of the function body
6632 gets a BLOCK if there are any in the function.
6633 Otherwise, the dbx output is wrong. */
6635 keep_next_if_subblocks = 1;
6637 /* ??? This might be an improvement,
6638 but needs to be thought about some more. */
6640 keep_next_level_flag = 1;
6643 /* Write a record describing this function definition to the prototypes
6644 file (if requested). */
6646 gen_aux_info_record (fndecl, 1, 0, prototype);
6648 /* Initialize the RTL code for the function. */
6650 init_function_start (fndecl, input_filename, lineno);
6652 /* If this is a varargs function, inform function.c. */
6654 if (c_function_varargs)
6657 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
6659 declare_function_name ();
6661 /* Set up parameters and prepare for return, for the function. */
6663 expand_function_start (fndecl, 0);
6665 /* If this function is `main', emit a call to `__main'
6666 to run global initializers, etc. */
6667 if (DECL_NAME (fndecl)
6668 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main") == 0
6669 && DECL_CONTEXT (fndecl) == NULL_TREE)
6670 expand_main_function ();
6673 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6674 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6675 stands for an ellipsis in the identifier list.
6677 PARMLIST is the data returned by get_parm_info for the
6678 parmlist that follows the semicolon.
6680 We return a value of the same sort that get_parm_info returns,
6681 except that it describes the combination of identifiers and parmlist. */
6684 combine_parm_decls (specparms, parmlist, void_at_end)
6685 tree specparms, parmlist;
6688 register tree fndecl = current_function_decl;
6691 tree parmdecls = TREE_PURPOSE (parmlist);
6693 /* This is a chain of any other decls that came in among the parm
6694 declarations. They were separated already by get_parm_info,
6695 so we just need to keep them separate. */
6696 tree nonparms = TREE_VALUE (parmlist);
6700 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6701 DECL_RESULT (parm) = 0;
6703 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6705 register tree tail, found = NULL;
6707 /* See if any of the parmdecls specifies this parm by name. */
6708 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6709 if (DECL_NAME (tail) == TREE_VALUE (parm))
6715 /* If declaration already marked, we have a duplicate name.
6716 Complain, and don't use this decl twice. */
6717 if (found && DECL_RESULT (found) != 0)
6719 error_with_decl (found, "multiple parameters named `%s'");
6723 /* If the declaration says "void", complain and ignore it. */
6724 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6726 error_with_decl (found, "parameter `%s' declared void");
6727 TREE_TYPE (found) = integer_type_node;
6728 DECL_ARG_TYPE (found) = integer_type_node;
6729 layout_decl (found, 0);
6732 /* Traditionally, a parm declared float is actually a double. */
6733 if (found && flag_traditional
6734 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6736 TREE_TYPE (found) = double_type_node;
6737 DECL_ARG_TYPE (found) = double_type_node;
6738 layout_decl (found, 0);
6741 /* If no declaration found, default to int. */
6744 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6746 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6747 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6748 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6749 error_with_decl (found, "type of parameter `%s' is not declared");
6753 TREE_PURPOSE (parm) = found;
6755 /* Mark this decl as "already found" -- see test, above.
6756 It is safe to use DECL_RESULT for this
6757 since it is not used in PARM_DECLs or CONST_DECLs. */
6758 DECL_RESULT (found) = error_mark_node;
6761 /* Complain about any actual PARM_DECLs not matched with any names. */
6763 for (parm = parmdecls; parm; )
6765 tree next = TREE_CHAIN (parm);
6766 TREE_CHAIN (parm) = 0;
6768 /* Complain about args with incomplete types. */
6769 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6771 error_with_decl (parm, "parameter `%s' has incomplete type");
6772 TREE_TYPE (parm) = error_mark_node;
6775 if (DECL_RESULT (parm) == 0)
6777 error_with_decl (parm,
6778 "declaration for parameter `%s' but no such parameter");
6779 /* Pretend the parameter was not missing.
6780 This gets us to a standard state and minimizes
6781 further error messages. */
6783 = chainon (specparms,
6784 tree_cons (parm, NULL_TREE, NULL_TREE));
6790 /* Chain the declarations together in the order of the list of names.
6791 At the same time, build up a list of their types, in reverse order. */
6797 for (last = 0; parm; parm = TREE_CHAIN (parm))
6798 if (TREE_PURPOSE (parm))
6801 parmdecls = TREE_PURPOSE (parm);
6803 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6804 last = TREE_PURPOSE (parm);
6805 TREE_CHAIN (last) = 0;
6807 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (parm), types);
6812 return saveable_tree_cons (parmdecls, nonparms,
6813 nreverse (saveable_tree_cons (NULL_TREE,
6817 return saveable_tree_cons (parmdecls, nonparms, nreverse (types));
6820 /* Finish up a function declaration and compile that function
6821 all the way to assembler language output. The free the storage
6822 for the function definition.
6824 This is called after parsing the body of the function definition.
6826 NESTED is nonzero if the function being finished is nested in another. */
6829 finish_function (nested)
6832 register tree fndecl = current_function_decl;
6834 /* TREE_READONLY (fndecl) = 1;
6835 This caused &foo to be of type ptr-to-const-function
6836 which then got a warning when stored in a ptr-to-function variable. */
6839 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6841 /* Must mark the RESULT_DECL as being in this function. */
6843 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6845 /* Obey `register' declarations if `setjmp' is called in this fn. */
6846 if (flag_traditional && current_function_calls_setjmp)
6848 setjmp_protect (DECL_INITIAL (fndecl));
6849 setjmp_protect_args ();
6852 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main"))
6854 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6855 != integer_type_node)
6857 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6858 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6860 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
6864 #ifdef DEFAULT_MAIN_RETURN
6865 /* Make it so that `main' always returns success by default. */
6866 DEFAULT_MAIN_RETURN;
6871 /* Generate rtl for function exit. */
6872 expand_function_end (input_filename, lineno, 0);
6874 /* So we can tell if jump_optimize sets it to 1. */
6877 /* Run the optimizers and output the assembler code for this function. */
6878 rest_of_compilation (fndecl);
6880 current_function_returns_null |= can_reach_end;
6882 if (warn_missing_noreturn
6883 && !TREE_THIS_VOLATILE (fndecl)
6884 && !current_function_returns_null
6885 && !current_function_returns_value)
6886 warning ("function might be possible candidate for attribute `noreturn'");
6888 if (TREE_THIS_VOLATILE (fndecl) && current_function_returns_null)
6889 warning ("`noreturn' function does return");
6890 else if (warn_return_type && can_reach_end
6891 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) != void_type_node)
6892 /* If this function returns non-void and control can drop through,
6894 warning ("control reaches end of non-void function");
6895 /* With just -W, complain only if function returns both with
6896 and without a value. */
6897 else if (extra_warnings
6898 && current_function_returns_value && current_function_returns_null)
6899 warning ("this function may return with or without a value");
6901 /* If requested, warn about function definitions where the function will
6902 return a value (usually of some struct or union type) which itself will
6903 take up a lot of stack space. */
6905 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6907 register tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6911 register tree ret_type_size = TYPE_SIZE (ret_type);
6913 if (TREE_CODE (ret_type_size) == INTEGER_CST)
6916 = TREE_INT_CST_LOW (ret_type_size) / BITS_PER_UNIT;
6918 if (units > larger_than_size)
6919 warning_with_decl (fndecl,
6920 "size of return value of `%s' is %u bytes",
6926 /* Free all the tree nodes making up this function. */
6927 /* Switch back to allocating nodes permanently
6928 until we start another function. */
6930 permanent_allocation (1);
6932 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested)
6934 /* Stop pointing to the local nodes about to be freed. */
6935 /* But DECL_INITIAL must remain nonzero so we know this
6936 was an actual function definition. */
6937 /* For a nested function, this is done in pop_c_function_context. */
6938 /* If rest_of_compilation set this to 0, leave it 0. */
6939 if (DECL_INITIAL (fndecl) != 0)
6940 DECL_INITIAL (fndecl) = error_mark_node;
6941 DECL_ARGUMENTS (fndecl) = 0;
6944 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6946 #ifndef ASM_OUTPUT_CONSTRUCTOR
6947 if (! flag_gnu_linker)
6948 static_ctors = perm_tree_cons (NULL_TREE, fndecl, static_ctors);
6951 assemble_constructor (IDENTIFIER_POINTER (DECL_NAME (fndecl)));
6953 if (DECL_STATIC_DESTRUCTOR (fndecl))
6955 #ifndef ASM_OUTPUT_DESTRUCTOR
6956 if (! flag_gnu_linker)
6957 static_dtors = perm_tree_cons (NULL_TREE, fndecl, static_dtors);
6960 assemble_destructor (IDENTIFIER_POINTER (DECL_NAME (fndecl)));
6965 /* Let the error reporting routines know that we're outside a
6966 function. For a nested function, this value is used in
6967 pop_c_function_context and then reset via pop_function_context. */
6968 current_function_decl = NULL;
6972 /* Save and restore the variables in this file and elsewhere
6973 that keep track of the progress of compilation of the current function.
6974 Used for nested functions. */
6978 struct c_function *next;
6980 tree shadowed_labels;
6983 int warn_about_return_type;
6985 struct binding_level *binding_level;
6988 struct c_function *c_function_chain;
6990 /* Save and reinitialize the variables
6991 used during compilation of a C function. */
6994 push_c_function_context ()
6996 struct c_function *p
6997 = (struct c_function *) xmalloc (sizeof (struct c_function));
7000 pedwarn ("ANSI C forbids nested functions");
7002 push_function_context ();
7004 p->next = c_function_chain;
7005 c_function_chain = p;
7007 p->named_labels = named_labels;
7008 p->shadowed_labels = shadowed_labels;
7009 p->returns_value = current_function_returns_value;
7010 p->returns_null = current_function_returns_null;
7011 p->warn_about_return_type = warn_about_return_type;
7012 p->extern_inline = current_extern_inline;
7013 p->binding_level = current_binding_level;
7016 /* Restore the variables used during compilation of a C function. */
7019 pop_c_function_context ()
7021 struct c_function *p = c_function_chain;
7024 /* Bring back all the labels that were shadowed. */
7025 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
7026 if (DECL_NAME (TREE_VALUE (link)) != 0)
7027 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
7028 = TREE_VALUE (link);
7030 if (DECL_SAVED_INSNS (current_function_decl) == 0)
7032 /* Stop pointing to the local nodes about to be freed. */
7033 /* But DECL_INITIAL must remain nonzero so we know this
7034 was an actual function definition. */
7035 DECL_INITIAL (current_function_decl) = error_mark_node;
7036 DECL_ARGUMENTS (current_function_decl) = 0;
7039 pop_function_context ();
7041 c_function_chain = p->next;
7043 named_labels = p->named_labels;
7044 shadowed_labels = p->shadowed_labels;
7045 current_function_returns_value = p->returns_value;
7046 current_function_returns_null = p->returns_null;
7047 warn_about_return_type = p->warn_about_return_type;
7048 current_extern_inline = p->extern_inline;
7049 current_binding_level = p->binding_level;
7054 /* integrate_decl_tree calls this function, but since we don't use the
7055 DECL_LANG_SPECIFIC field, this is a no-op. */
7058 copy_lang_decl (node)
7059 tree node ATTRIBUTE_UNUSED;