1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000
3 Free Software Foundation, Inc.
5 This file is part of GNU CC.
7 GNU CC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU CC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
47 extern cpp_reader parse_in;
50 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
52 { NORMAL, /* Ordinary declaration */
53 FUNCDEF, /* Function definition */
54 PARM, /* Declaration of parm before function body */
55 FIELD, /* Declaration inside struct or union */
56 BITFIELD, /* Likewise but with specified width */
57 TYPENAME}; /* Typename (inside cast or sizeof) */
59 /* We let tm.h override the types used here, to handle trivial differences
60 such as the choice of unsigned int or long unsigned int for size_t.
61 When machines start needing nontrivial differences in the size type,
62 it would be best to do something here to figure out automatically
63 from other information what type to use. */
66 #define SIZE_TYPE "long unsigned int"
70 #define PTRDIFF_TYPE "long int"
74 #define WCHAR_TYPE "int"
78 #define WINT_TYPE "unsigned int"
84 /* Nonzero if we have seen an invalid cross reference
85 to a struct, union, or enum, but not yet printed the message. */
87 tree pending_invalid_xref;
88 /* File and line to appear in the eventual error message. */
89 const char *pending_invalid_xref_file;
90 int pending_invalid_xref_line;
92 /* While defining an enum type, this is 1 plus the last enumerator
93 constant value. Note that will do not have to save this or `enum_overflow'
94 around nested function definition since such a definition could only
95 occur in an enum value expression and we don't use these variables in
98 static tree enum_next_value;
100 /* Nonzero means that there was overflow computing enum_next_value. */
102 static int enum_overflow;
104 /* Parsing a function declarator leaves a list of parameter names
105 or a chain or parameter decls here. */
107 static tree last_function_parms;
109 /* Parsing a function declarator leaves here a chain of structure
110 and enum types declared in the parmlist. */
112 static tree last_function_parm_tags;
114 /* After parsing the declarator that starts a function definition,
115 `start_function' puts here the list of parameter names or chain of decls.
116 `store_parm_decls' finds it here. */
118 static tree current_function_parms;
120 /* Similar, for last_function_parm_tags. */
121 static tree current_function_parm_tags;
123 /* Similar, for the file and line that the prototype came from if this is
124 an old-style definition. */
125 static const char *current_function_prototype_file;
126 static int current_function_prototype_line;
128 /* The current statement tree. */
130 static struct stmt_tree_s c_stmt_tree;
132 /* The current scope statement stack. */
134 static tree c_scope_stmt_stack;
136 /* Nonzero if __FUNCTION__ and its ilk have been declared in this
139 static int c_function_name_declared_p;
141 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
142 that have names. Here so we can clear out their names' definitions
143 at the end of the function. */
145 static tree named_labels;
147 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
149 static tree shadowed_labels;
151 /* Nonzero when store_parm_decls is called indicates a varargs function.
152 Value not meaningful after store_parm_decls. */
154 static int c_function_varargs;
156 /* Set to 0 at beginning of a function definition, set to 1 if
157 a return statement that specifies a return value is seen. */
159 int current_function_returns_value;
161 /* Set to 0 at beginning of a function definition, set to 1 if
162 a return statement with no argument is seen. */
164 int current_function_returns_null;
166 /* Set to nonzero by `grokdeclarator' for a function
167 whose return type is defaulted, if warnings for this are desired. */
169 static int warn_about_return_type;
171 /* Nonzero when starting a function declared `extern inline'. */
173 static int current_extern_inline;
175 /* For each binding contour we allocate a binding_level structure
176 * which records the names defined in that contour.
179 * 1) one for each function definition,
180 * where internal declarations of the parameters appear.
181 * 2) one for each compound statement,
182 * to record its declarations.
184 * The current meaning of a name can be found by searching the levels from
185 * the current one out to the global one.
188 /* Note that the information in the `names' component of the global contour
189 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
193 /* A chain of _DECL nodes for all variables, constants, functions,
194 and typedef types. These are in the reverse of the order supplied.
198 /* A list of structure, union and enum definitions,
199 * for looking up tag names.
200 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
201 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
202 * or ENUMERAL_TYPE node.
206 /* For each level, a list of shadowed outer-level local definitions
207 to be restored when this level is popped.
208 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
209 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
212 /* For each level (except not the global one),
213 a chain of BLOCK nodes for all the levels
214 that were entered and exited one level down. */
217 /* The BLOCK node for this level, if one has been preallocated.
218 If 0, the BLOCK is allocated (if needed) when the level is popped. */
221 /* The binding level which this one is contained in (inherits from). */
222 struct binding_level *level_chain;
224 /* Nonzero for the level that holds the parameters of a function. */
227 /* Nonzero if this level "doesn't exist" for tags. */
228 char tag_transparent;
230 /* Nonzero if sublevels of this level "don't exist" for tags.
231 This is set in the parm level of a function definition
232 while reading the function body, so that the outermost block
233 of the function body will be tag-transparent. */
234 char subblocks_tag_transparent;
236 /* Nonzero means make a BLOCK for this level regardless of all else. */
239 /* Nonzero means make a BLOCK if this level has any subblocks. */
240 char keep_if_subblocks;
242 /* Number of decls in `names' that have incomplete
243 structure or union types. */
246 /* A list of decls giving the (reversed) specified order of parms,
247 not including any forward-decls in the parmlist.
248 This is so we can put the parms in proper order for assign_parms. */
252 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
254 /* The binding level currently in effect. */
256 static struct binding_level *current_binding_level;
258 /* A chain of binding_level structures awaiting reuse. */
260 static struct binding_level *free_binding_level;
262 /* The outermost binding level, for names of file scope.
263 This is created when the compiler is started and exists
264 through the entire run. */
266 static struct binding_level *global_binding_level;
268 /* Binding level structures are initialized by copying this one. */
270 static struct binding_level clear_binding_level
271 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, 0,
274 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
276 static int keep_next_level_flag;
278 /* Nonzero means make a BLOCK for the next level pushed
279 if it has subblocks. */
281 static int keep_next_if_subblocks;
283 /* The chain of outer levels of label scopes.
284 This uses the same data structure used for binding levels,
285 but it works differently: each link in the chain records
286 saved values of named_labels and shadowed_labels for
287 a label binding level outside the current one. */
289 static struct binding_level *label_level_chain;
291 /* Functions called automatically at the beginning and end of execution. */
293 tree static_ctors, static_dtors;
295 /* Forward declarations. */
297 static struct binding_level * make_binding_level PARAMS ((void));
298 static void mark_binding_level PARAMS ((void *));
299 static void clear_limbo_values PARAMS ((tree));
300 static int duplicate_decls PARAMS ((tree, tree, int));
301 static int redeclaration_error_message PARAMS ((tree, tree));
302 static void storedecls PARAMS ((tree));
303 static void storetags PARAMS ((tree));
304 static tree lookup_tag PARAMS ((enum tree_code, tree,
305 struct binding_level *, int));
306 static tree lookup_tag_reverse PARAMS ((tree));
307 static tree grokdeclarator PARAMS ((tree, tree, enum decl_context,
309 static tree grokparms PARAMS ((tree, int));
310 static void layout_array_type PARAMS ((tree));
311 static tree c_make_fname_decl PARAMS ((tree, const char *, int));
312 static void c_expand_body PARAMS ((tree, int));
314 /* C-specific option variables. */
316 /* Nonzero means allow type mismatches in conditional expressions;
317 just make their values `void'. */
319 int flag_cond_mismatch;
321 /* Nonzero means give `double' the same size as `float'. */
323 int flag_short_double;
325 /* Nonzero means give `wchar_t' the same size as `short'. */
327 int flag_short_wchar;
329 /* Nonzero means don't recognize the keyword `asm'. */
333 /* Nonzero means don't recognize any builtin functions. */
337 /* Nonzero means don't recognize the non-ANSI builtin functions.
340 int flag_no_nonansi_builtin;
342 /* Nonzero means do some things the same way PCC does. */
344 int flag_traditional;
346 /* Nonzero means enable C89 Amendment 1 features, other than digraphs. */
350 /* Nonzero means use the ISO C99 dialect of C. */
354 /* Nonzero means accept digraphs. */
356 int flag_digraphs = 1;
358 /* Nonzero means that we have builtin functions, and main is an int */
362 /* Nonzero means add default format_arg attributes for functions not
365 int flag_noniso_default_format_attributes = 1;
367 /* Nonzero means to allow single precision math even if we're generally
368 being traditional. */
369 int flag_allow_single_precision = 0;
371 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
373 int flag_signed_bitfields = 1;
374 int explicit_flag_signed_bitfields = 0;
376 /* Nonzero means warn about use of implicit int. */
378 int warn_implicit_int;
380 /* Nonzero means warn about usage of long long when `-pedantic'. */
382 int warn_long_long = 1;
384 /* Nonzero means message about use of implicit function declarations;
385 1 means warning; 2 means error. */
387 int mesg_implicit_function_declaration = -1;
389 /* Nonzero means give string constants the type `const char *'
390 to get extra warnings from them. These warnings will be too numerous
391 to be useful, except in thoroughly ANSIfied programs. */
393 int flag_const_strings;
395 /* Nonzero means warn about pointer casts that can drop a type qualifier
396 from the pointer target type. */
400 /* Nonzero means warn when casting a function call to a type that does
401 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
402 when there is no previous declaration of sqrt or malloc. */
404 int warn_bad_function_cast;
406 /* Warn about functions which might be candidates for attribute noreturn. */
408 int warn_missing_noreturn;
410 /* Warn about traditional constructs whose meanings changed in ANSI C. */
412 int warn_traditional;
414 /* Nonzero means warn about sizeof(function) or addition/subtraction
415 of function pointers. */
417 int warn_pointer_arith;
419 /* Nonzero means warn for non-prototype function decls
420 or non-prototyped defs without previous prototype. */
422 int warn_strict_prototypes;
424 /* Nonzero means warn for any global function def
425 without separate previous prototype decl. */
427 int warn_missing_prototypes;
429 /* Nonzero means warn for any global function def
430 without separate previous decl. */
432 int warn_missing_declarations;
434 /* Nonzero means warn about multiple (redundant) decls for the same single
435 variable or function. */
437 int warn_redundant_decls = 0;
439 /* Nonzero means warn about extern declarations of objects not at
440 file-scope level and about *all* declarations of functions (whether
441 extern or static) not at file-scope level. Note that we exclude
442 implicit function declarations. To get warnings about those, use
445 int warn_nested_externs = 0;
447 /* Warn about *printf or *scanf format/argument anomalies. */
451 /* Warn about a subscript that has type char. */
453 int warn_char_subscripts = 0;
455 /* Warn if a type conversion is done that might have confusing results. */
459 /* Warn if adding () is suggested. */
461 int warn_parentheses;
463 /* Warn if initializer is not completely bracketed. */
465 int warn_missing_braces;
467 /* Warn if main is suspicious. */
471 /* Warn about #pragma directives that are not recognised. */
473 int warn_unknown_pragmas = 0; /* Tri state variable. */
475 /* Warn about comparison of signed and unsigned values.
476 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
478 int warn_sign_compare = -1;
480 /* Warn about testing equality of floating point numbers. */
482 int warn_float_equal = 0;
484 /* Nonzero means warn about use of multicharacter literals. */
486 int warn_multichar = 1;
488 /* The variant of the C language being processed. */
490 c_language_kind c_language = clk_c;
492 /* Nonzero means `$' can be in an identifier. */
494 #ifndef DOLLARS_IN_IDENTIFIERS
495 #define DOLLARS_IN_IDENTIFIERS 1
497 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
499 /* Decode the string P as a language-specific option for C.
500 Return the number of strings consumed. Should not complain
501 if it does not recognise the option. */
504 c_decode_option (argc, argv)
505 int argc ATTRIBUTE_UNUSED;
508 int strings_processed;
511 strings_processed = cpp_handle_option (&parse_in, argc, argv);
513 strings_processed = 0;
514 #endif /* ! USE_CPPLIB */
516 if (!strcmp (p, "-lang-objc"))
517 c_language = clk_objective_c;
518 else if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
520 flag_traditional = 1;
521 flag_writable_strings = 1;
524 else if (!strcmp (p, "-fallow-single-precision"))
525 flag_allow_single_precision = 1;
526 else if (!strcmp (p, "-fhosted") || !strcmp (p, "-fno-freestanding"))
531 else if (!strcmp (p, "-ffreestanding") || !strcmp (p, "-fno-hosted"))
535 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
539 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
541 flag_traditional = 0;
542 flag_writable_strings = 0;
545 else if (!strncmp (p, "-std=", 5))
547 /* Select the appropriate language standard. We currently
549 -std=iso9899:1990 same as -ansi
550 -std=iso9899:199409 ISO C as modified in amend. 1
551 -std=iso9899:1999 ISO C 99
552 -std=c89 same as -std=iso9899:1990
553 -std=c99 same as -std=iso9899:1999
554 -std=gnu89 default, iso9899:1990 + gnu extensions
555 -std=gnu99 iso9899:1999 + gnu extensions
557 const char *argstart = &p[5];
559 if (!strcmp (argstart, "iso9899:1990")
560 || !strcmp (argstart, "c89"))
566 flag_traditional = 0;
567 flag_writable_strings = 0;
569 flag_no_nonansi_builtin = 1;
570 flag_noniso_default_format_attributes = 0;
573 else if (!strcmp (argstart, "iso9899:199409"))
577 goto iso_1990_digraphs;
579 else if (!strcmp (argstart, "iso9899:199x")
580 || !strcmp (argstart, "iso9899:1999")
581 || !strcmp (argstart, "c9x")
582 || !strcmp (argstart, "c99"))
584 flag_traditional = 0;
585 flag_writable_strings = 0;
587 flag_no_nonansi_builtin = 1;
588 flag_noniso_default_format_attributes = 0;
593 else if (!strcmp (argstart, "gnu89"))
595 flag_traditional = 0;
596 flag_writable_strings = 0;
598 flag_no_nonansi_builtin = 0;
599 flag_noniso_default_format_attributes = 1;
604 else if (!strcmp (argstart, "gnu9x") || !strcmp (argstart, "gnu99"))
606 flag_traditional = 0;
607 flag_writable_strings = 0;
609 flag_no_nonansi_builtin = 0;
610 flag_noniso_default_format_attributes = 1;
616 error ("unknown C standard `%s'", argstart);
618 else if (!strcmp (p, "-fdollars-in-identifiers"))
619 dollars_in_ident = 1;
620 else if (!strcmp (p, "-fno-dollars-in-identifiers"))
621 dollars_in_ident = 0;
622 else if (!strcmp (p, "-fsigned-char"))
623 flag_signed_char = 1;
624 else if (!strcmp (p, "-funsigned-char"))
625 flag_signed_char = 0;
626 else if (!strcmp (p, "-fno-signed-char"))
627 flag_signed_char = 0;
628 else if (!strcmp (p, "-fno-unsigned-char"))
629 flag_signed_char = 1;
630 else if (!strcmp (p, "-fsigned-bitfields")
631 || !strcmp (p, "-fno-unsigned-bitfields"))
633 flag_signed_bitfields = 1;
634 explicit_flag_signed_bitfields = 1;
636 else if (!strcmp (p, "-funsigned-bitfields")
637 || !strcmp (p, "-fno-signed-bitfields"))
639 flag_signed_bitfields = 0;
640 explicit_flag_signed_bitfields = 1;
642 else if (!strcmp (p, "-fshort-enums"))
643 flag_short_enums = 1;
644 else if (!strcmp (p, "-fno-short-enums"))
645 flag_short_enums = 0;
646 else if (!strcmp (p, "-fshort-wchar"))
647 flag_short_wchar = 1;
648 else if (!strcmp (p, "-fno-short-wchar"))
649 flag_short_wchar = 0;
650 else if (!strcmp (p, "-fcond-mismatch"))
651 flag_cond_mismatch = 1;
652 else if (!strcmp (p, "-fno-cond-mismatch"))
653 flag_cond_mismatch = 0;
654 else if (!strcmp (p, "-fshort-double"))
655 flag_short_double = 1;
656 else if (!strcmp (p, "-fno-short-double"))
657 flag_short_double = 0;
658 else if (!strcmp (p, "-fasm"))
660 else if (!strcmp (p, "-fno-asm"))
662 else if (!strcmp (p, "-fbuiltin"))
664 else if (!strcmp (p, "-fno-builtin"))
666 else if (!strcmp (p, "-ansi"))
668 else if (!strcmp (p, "-Werror-implicit-function-declaration"))
669 mesg_implicit_function_declaration = 2;
670 else if (!strcmp (p, "-Wimplicit-function-declaration"))
671 mesg_implicit_function_declaration = 1;
672 else if (!strcmp (p, "-Wno-implicit-function-declaration"))
673 mesg_implicit_function_declaration = 0;
674 else if (!strcmp (p, "-Wimplicit-int"))
675 warn_implicit_int = 1;
676 else if (!strcmp (p, "-Wno-implicit-int"))
677 warn_implicit_int = 0;
678 else if (!strcmp (p, "-Wimplicit"))
680 warn_implicit_int = 1;
681 if (mesg_implicit_function_declaration != 2)
682 mesg_implicit_function_declaration = 1;
684 else if (!strcmp (p, "-Wno-implicit"))
685 warn_implicit_int = 0, mesg_implicit_function_declaration = 0;
686 else if (!strcmp (p, "-Wlong-long"))
688 else if (!strcmp (p, "-Wno-long-long"))
690 else if (!strcmp (p, "-Wwrite-strings"))
691 flag_const_strings = 1;
692 else if (!strcmp (p, "-Wno-write-strings"))
693 flag_const_strings = 0;
694 else if (!strcmp (p, "-Wcast-qual"))
696 else if (!strcmp (p, "-Wno-cast-qual"))
698 else if (!strcmp (p, "-Wbad-function-cast"))
699 warn_bad_function_cast = 1;
700 else if (!strcmp (p, "-Wno-bad-function-cast"))
701 warn_bad_function_cast = 0;
702 else if (!strcmp (p, "-Wmissing-noreturn"))
703 warn_missing_noreturn = 1;
704 else if (!strcmp (p, "-Wno-missing-noreturn"))
705 warn_missing_noreturn = 0;
706 else if (!strcmp (p, "-Wpointer-arith"))
707 warn_pointer_arith = 1;
708 else if (!strcmp (p, "-Wno-pointer-arith"))
709 warn_pointer_arith = 0;
710 else if (!strcmp (p, "-Wstrict-prototypes"))
711 warn_strict_prototypes = 1;
712 else if (!strcmp (p, "-Wno-strict-prototypes"))
713 warn_strict_prototypes = 0;
714 else if (!strcmp (p, "-Wmissing-prototypes"))
715 warn_missing_prototypes = 1;
716 else if (!strcmp (p, "-Wno-missing-prototypes"))
717 warn_missing_prototypes = 0;
718 else if (!strcmp (p, "-Wmissing-declarations"))
719 warn_missing_declarations = 1;
720 else if (!strcmp (p, "-Wno-missing-declarations"))
721 warn_missing_declarations = 0;
722 else if (!strcmp (p, "-Wredundant-decls"))
723 warn_redundant_decls = 1;
724 else if (!strcmp (p, "-Wno-redundant-decls"))
725 warn_redundant_decls = 0;
726 else if (!strcmp (p, "-Wnested-externs"))
727 warn_nested_externs = 1;
728 else if (!strcmp (p, "-Wno-nested-externs"))
729 warn_nested_externs = 0;
730 else if (!strcmp (p, "-Wtraditional"))
731 warn_traditional = 1;
732 else if (!strcmp (p, "-Wno-traditional"))
733 warn_traditional = 0;
734 else if (!strncmp (p, "-Wformat=", 9))
735 warn_format = atol (p + 9);
736 else if (!strcmp (p, "-Wformat"))
738 else if (!strcmp (p, "-Wno-format"))
740 else if (!strcmp (p, "-Wchar-subscripts"))
741 warn_char_subscripts = 1;
742 else if (!strcmp (p, "-Wno-char-subscripts"))
743 warn_char_subscripts = 0;
744 else if (!strcmp (p, "-Wconversion"))
746 else if (!strcmp (p, "-Wno-conversion"))
748 else if (!strcmp (p, "-Wparentheses"))
749 warn_parentheses = 1;
750 else if (!strcmp (p, "-Wno-parentheses"))
751 warn_parentheses = 0;
752 else if (!strcmp (p, "-Wreturn-type"))
753 warn_return_type = 1;
754 else if (!strcmp (p, "-Wno-return-type"))
755 warn_return_type = 0;
756 else if (!strcmp (p, "-Wcomment"))
757 ; /* cpp handles this one. */
758 else if (!strcmp (p, "-Wno-comment"))
759 ; /* cpp handles this one. */
760 else if (!strcmp (p, "-Wcomments"))
761 ; /* cpp handles this one. */
762 else if (!strcmp (p, "-Wno-comments"))
763 ; /* cpp handles this one. */
764 else if (!strcmp (p, "-Wtrigraphs"))
765 ; /* cpp handles this one. */
766 else if (!strcmp (p, "-Wno-trigraphs"))
767 ; /* cpp handles this one. */
768 else if (!strcmp (p, "-Wundef"))
769 ; /* cpp handles this one. */
770 else if (!strcmp (p, "-Wno-undef"))
771 ; /* cpp handles this one. */
772 else if (!strcmp (p, "-Wimport"))
773 ; /* cpp handles this one. */
774 else if (!strcmp (p, "-Wno-import"))
775 ; /* cpp handles this one. */
776 else if (!strcmp (p, "-Wmissing-braces"))
777 warn_missing_braces = 1;
778 else if (!strcmp (p, "-Wno-missing-braces"))
779 warn_missing_braces = 0;
780 else if (!strcmp (p, "-Wmain"))
782 else if (!strcmp (p, "-Wno-main"))
784 else if (!strcmp (p, "-Wsign-compare"))
785 warn_sign_compare = 1;
786 else if (!strcmp (p, "-Wno-sign-compare"))
787 warn_sign_compare = 0;
788 else if (!strcmp (p, "-Wfloat-equal"))
789 warn_float_equal = 1;
790 else if (!strcmp (p, "-Wno-float-equal"))
791 warn_float_equal = 0;
792 else if (!strcmp (p, "-Wmultichar"))
794 else if (!strcmp (p, "-Wno-multichar"))
796 else if (!strcmp (p, "-Wunknown-pragmas"))
797 /* Set to greater than 1, so that even unknown pragmas in system
798 headers will be warned about. */
799 warn_unknown_pragmas = 2;
800 else if (!strcmp (p, "-Wno-unknown-pragmas"))
801 warn_unknown_pragmas = 0;
802 else if (!strcmp (p, "-Wall"))
804 /* We save the value of warn_uninitialized, since if they put
805 -Wuninitialized on the command line, we need to generate a
806 warning about not using it without also specifying -O. */
807 if (warn_uninitialized != 1)
808 warn_uninitialized = 2;
809 warn_implicit_int = 1;
810 mesg_implicit_function_declaration = 1;
811 warn_return_type = 1;
815 warn_char_subscripts = 1;
816 warn_parentheses = 1;
817 warn_missing_braces = 1;
818 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
819 it off only if it's not explicit. */
821 /* Only warn about unknown pragmas that are not in system headers. */
822 warn_unknown_pragmas = 1;
825 return strings_processed;
830 /* Hooks for print_node. */
833 print_lang_decl (file, node, indent)
834 FILE *file ATTRIBUTE_UNUSED;
835 tree node ATTRIBUTE_UNUSED;
836 int indent ATTRIBUTE_UNUSED;
841 print_lang_type (file, node, indent)
842 FILE *file ATTRIBUTE_UNUSED;
843 tree node ATTRIBUTE_UNUSED;
844 int indent ATTRIBUTE_UNUSED;
849 print_lang_identifier (file, node, indent)
854 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
855 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
856 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
857 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
858 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
859 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
860 if (C_IS_RESERVED_WORD (node))
862 tree rid = ridpointers[C_RID_CODE (node)];
863 indent_to (file, indent + 4);
864 fprintf (file, "rid ");
865 fprintf (file, HOST_PTR_PRINTF, (void *)rid);
866 fprintf (file, " \"%s\"", IDENTIFIER_POINTER (rid));
870 /* Hook called at end of compilation to assume 1 elt
871 for a top-level tentative array defn that wasn't complete before. */
874 finish_incomplete_decl (decl)
877 if (TREE_CODE (decl) == VAR_DECL)
879 tree type = TREE_TYPE (decl);
880 if (type != error_mark_node
881 && TREE_CODE (type) == ARRAY_TYPE
882 && ! DECL_EXTERNAL (decl)
883 && TYPE_DOMAIN (type) == 0)
885 warning_with_decl (decl, "array `%s' assumed to have one element");
887 complete_array_type (type, NULL_TREE, 1);
889 layout_decl (decl, 0);
894 /* Create a new `struct binding_level'. */
896 static struct binding_level *
897 make_binding_level ()
900 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
903 /* Nonzero if we are currently in the global binding level. */
908 return current_binding_level == global_binding_level;
914 keep_next_level_flag = 1;
917 /* Nonzero if the current level needs to have a BLOCK made. */
922 return ((current_binding_level->keep_if_subblocks
923 && current_binding_level->blocks != 0)
924 || current_binding_level->keep
925 || current_binding_level->names != 0
926 || (current_binding_level->tags != 0
927 && !current_binding_level->tag_transparent));
930 /* Identify this binding level as a level of parameters.
931 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
932 But it turns out there is no way to pass the right value for
933 DEFINITION_FLAG, so we ignore it. */
936 declare_parm_level (definition_flag)
937 int definition_flag ATTRIBUTE_UNUSED;
939 current_binding_level->parm_flag = 1;
942 /* Nonzero if currently making parm declarations. */
947 return current_binding_level->parm_flag;
950 /* Enter a new binding level.
951 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
952 not for that of tags. */
955 pushlevel (tag_transparent)
958 register struct binding_level *newlevel = NULL_BINDING_LEVEL;
960 /* If this is the top level of a function,
961 just make sure that NAMED_LABELS is 0. */
963 if (current_binding_level == global_binding_level)
968 /* Reuse or create a struct for this binding level. */
970 if (free_binding_level)
972 newlevel = free_binding_level;
973 free_binding_level = free_binding_level->level_chain;
977 newlevel = make_binding_level ();
980 /* Add this level to the front of the chain (stack) of levels that
983 *newlevel = clear_binding_level;
984 newlevel->tag_transparent
986 || (current_binding_level
987 ? current_binding_level->subblocks_tag_transparent
989 newlevel->level_chain = current_binding_level;
990 current_binding_level = newlevel;
991 newlevel->keep = keep_next_level_flag;
992 keep_next_level_flag = 0;
993 newlevel->keep_if_subblocks = keep_next_if_subblocks;
994 keep_next_if_subblocks = 0;
997 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
1000 clear_limbo_values (block)
1005 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
1006 if (DECL_NAME (tem) != 0)
1007 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
1009 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
1010 clear_limbo_values (tem);
1013 /* Exit a binding level.
1014 Pop the level off, and restore the state of the identifier-decl mappings
1015 that were in effect when this level was entered.
1017 If KEEP is nonzero, this level had explicit declarations, so
1018 and create a "block" (a BLOCK node) for the level
1019 to record its declarations and subblocks for symbol table output.
1021 If FUNCTIONBODY is nonzero, this level is the body of a function,
1022 so create a block as if KEEP were set and also clear out all
1025 If REVERSE is nonzero, reverse the order of decls before putting
1026 them into the BLOCK. */
1029 poplevel (keep, reverse, functionbody)
1035 /* The chain of decls was accumulated in reverse order.
1036 Put it into forward order, just for cleanliness. */
1038 tree tags = current_binding_level->tags;
1039 tree subblocks = current_binding_level->blocks;
1042 int block_previously_created;
1044 keep |= current_binding_level->keep;
1046 /* This warning is turned off because it causes warnings for
1047 declarations like `extern struct foo *x'. */
1049 /* Warn about incomplete structure types in this level. */
1050 for (link = tags; link; link = TREE_CHAIN (link))
1051 if (!COMPLETE_TYPE_P (TREE_VALUE (link)))
1053 tree type = TREE_VALUE (link);
1054 tree type_name = TYPE_NAME (type);
1055 char *id = IDENTIFIER_POINTER (TREE_CODE (type_name) == IDENTIFIER_NODE
1057 : DECL_NAME (type_name));
1058 switch (TREE_CODE (type))
1061 error ("`struct %s' incomplete in scope ending here", id);
1064 error ("`union %s' incomplete in scope ending here", id);
1067 error ("`enum %s' incomplete in scope ending here", id);
1073 /* Get the decls in the order they were written.
1074 Usually current_binding_level->names is in reverse order.
1075 But parameter decls were previously put in forward order. */
1078 current_binding_level->names
1079 = decls = nreverse (current_binding_level->names);
1081 decls = current_binding_level->names;
1083 /* Output any nested inline functions within this block
1084 if they weren't already output. */
1086 for (decl = decls; decl; decl = TREE_CHAIN (decl))
1087 if (TREE_CODE (decl) == FUNCTION_DECL
1088 && ! TREE_ASM_WRITTEN (decl)
1089 && DECL_INITIAL (decl) != 0
1090 && TREE_ADDRESSABLE (decl))
1092 /* If this decl was copied from a file-scope decl
1093 on account of a block-scope extern decl,
1094 propagate TREE_ADDRESSABLE to the file-scope decl.
1096 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1097 true, since then the decl goes through save_for_inline_copying. */
1098 if (DECL_ABSTRACT_ORIGIN (decl) != 0
1099 && DECL_ABSTRACT_ORIGIN (decl) != decl)
1100 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
1103 /* We used to warn about unused variables in expand_end_bindings,
1104 i.e. while generating RTL. But in function-at-a-time mode we may
1105 choose to never expand a function at all (e.g. auto inlining), so
1106 we do this explicitly now. */
1107 warn_about_unused_variables (getdecls ());
1109 /* If there were any declarations or structure tags in that level,
1110 or if this level is a function body,
1111 create a BLOCK to record them for the life of this function. */
1114 block_previously_created = (current_binding_level->this_block != 0);
1115 if (block_previously_created)
1116 block = current_binding_level->this_block;
1117 else if (keep || functionbody
1118 || (current_binding_level->keep_if_subblocks && subblocks != 0))
1119 block = make_node (BLOCK);
1122 BLOCK_VARS (block) = decls;
1123 BLOCK_SUBBLOCKS (block) = subblocks;
1126 /* In each subblock, record that this is its superior. */
1128 for (link = subblocks; link; link = TREE_CHAIN (link))
1129 BLOCK_SUPERCONTEXT (link) = block;
1131 /* Clear out the meanings of the local variables of this level. */
1133 for (link = decls; link; link = TREE_CHAIN (link))
1135 if (DECL_NAME (link) != 0)
1137 /* If the ident. was used or addressed via a local extern decl,
1138 don't forget that fact. */
1139 if (DECL_EXTERNAL (link))
1141 if (TREE_USED (link))
1142 TREE_USED (DECL_NAME (link)) = 1;
1143 if (TREE_ADDRESSABLE (link))
1144 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1146 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1150 /* Restore all name-meanings of the outer levels
1151 that were shadowed by this level. */
1153 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1154 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1156 /* If the level being exited is the top level of a function,
1157 check over all the labels, and clear out the current
1158 (function local) meanings of their names. */
1162 clear_limbo_values (block);
1164 /* If this is the top level block of a function,
1165 the vars are the function's parameters.
1166 Don't leave them in the BLOCK because they are
1167 found in the FUNCTION_DECL instead. */
1169 BLOCK_VARS (block) = 0;
1171 /* Clear out the definitions of all label names,
1172 since their scopes end here,
1173 and add them to BLOCK_VARS. */
1175 for (link = named_labels; link; link = TREE_CHAIN (link))
1177 register tree label = TREE_VALUE (link);
1179 if (DECL_INITIAL (label) == 0)
1181 error_with_decl (label, "label `%s' used but not defined");
1182 /* Avoid crashing later. */
1183 define_label (input_filename, lineno,
1186 else if (warn_unused_label && !TREE_USED (label))
1187 warning_with_decl (label, "label `%s' defined but not used");
1188 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1190 /* Put the labels into the "variables" of the
1191 top-level block, so debugger can see them. */
1192 TREE_CHAIN (label) = BLOCK_VARS (block);
1193 BLOCK_VARS (block) = label;
1197 /* Pop the current level, and free the structure for reuse. */
1200 register struct binding_level *level = current_binding_level;
1201 current_binding_level = current_binding_level->level_chain;
1203 level->level_chain = free_binding_level;
1204 free_binding_level = level;
1207 /* Dispose of the block that we just made inside some higher level. */
1209 DECL_INITIAL (current_function_decl) = block;
1212 if (!block_previously_created)
1213 current_binding_level->blocks
1214 = chainon (current_binding_level->blocks, block);
1216 /* If we did not make a block for the level just exited,
1217 any blocks made for inner levels
1218 (since they cannot be recorded as subblocks in that level)
1219 must be carried forward so they will later become subblocks
1220 of something else. */
1222 current_binding_level->blocks
1223 = chainon (current_binding_level->blocks, subblocks);
1225 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1226 binding contour so that they point to the appropriate construct, i.e.
1227 either to the current FUNCTION_DECL node, or else to the BLOCK node
1228 we just constructed.
1230 Note that for tagged types whose scope is just the formal parameter
1231 list for some function type specification, we can't properly set
1232 their TYPE_CONTEXTs here, because we don't have a pointer to the
1233 appropriate FUNCTION_TYPE node readily available to us. For those
1234 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1235 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1236 node which will represent the "scope" for these "parameter list local"
1240 for (link = tags; link; link = TREE_CHAIN (link))
1241 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1243 for (link = tags; link; link = TREE_CHAIN (link))
1244 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1247 TREE_USED (block) = 1;
1252 /* Delete the node BLOCK from the current binding level.
1253 This is used for the block inside a stmt expr ({...})
1254 so that the block can be reinserted where appropriate. */
1257 delete_block (block)
1261 if (current_binding_level->blocks == block)
1262 current_binding_level->blocks = TREE_CHAIN (block);
1263 for (t = current_binding_level->blocks; t;)
1265 if (TREE_CHAIN (t) == block)
1266 TREE_CHAIN (t) = TREE_CHAIN (block);
1270 TREE_CHAIN (block) = NULL;
1271 /* Clear TREE_USED which is always set by poplevel.
1272 The flag is set again if insert_block is called. */
1273 TREE_USED (block) = 0;
1276 /* Insert BLOCK at the end of the list of subblocks of the
1277 current binding level. This is used when a BIND_EXPR is expanded,
1278 to handle the BLOCK node inside the BIND_EXPR. */
1281 insert_block (block)
1284 TREE_USED (block) = 1;
1285 current_binding_level->blocks
1286 = chainon (current_binding_level->blocks, block);
1289 /* Set the BLOCK node for the innermost scope
1290 (the one we are currently in). */
1294 register tree block;
1296 current_binding_level->this_block = block;
1302 register struct binding_level *newlevel;
1304 /* Reuse or create a struct for this binding level. */
1306 if (free_binding_level)
1308 newlevel = free_binding_level;
1309 free_binding_level = free_binding_level->level_chain;
1313 newlevel = make_binding_level ();
1316 /* Add this level to the front of the chain (stack) of label levels. */
1318 newlevel->level_chain = label_level_chain;
1319 label_level_chain = newlevel;
1321 newlevel->names = named_labels;
1322 newlevel->shadowed = shadowed_labels;
1324 shadowed_labels = 0;
1330 register struct binding_level *level = label_level_chain;
1333 /* Clear out the definitions of the declared labels in this level.
1334 Leave in the list any ordinary, non-declared labels. */
1335 for (link = named_labels, prev = 0; link;)
1337 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1339 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1341 error_with_decl (TREE_VALUE (link),
1342 "label `%s' used but not defined");
1343 /* Avoid crashing later. */
1344 define_label (input_filename, lineno,
1345 DECL_NAME (TREE_VALUE (link)));
1347 else if (warn_unused_label && !TREE_USED (TREE_VALUE (link)))
1348 warning_with_decl (TREE_VALUE (link),
1349 "label `%s' defined but not used");
1350 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1352 /* Delete this element from the list. */
1353 link = TREE_CHAIN (link);
1355 TREE_CHAIN (prev) = link;
1357 named_labels = link;
1362 link = TREE_CHAIN (link);
1366 /* Bring back all the labels that were shadowed. */
1367 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1368 if (DECL_NAME (TREE_VALUE (link)) != 0)
1369 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1370 = TREE_VALUE (link);
1372 named_labels = chainon (named_labels, level->names);
1373 shadowed_labels = level->shadowed;
1375 /* Pop the current level, and free the structure for reuse. */
1376 label_level_chain = label_level_chain->level_chain;
1377 level->level_chain = free_binding_level;
1378 free_binding_level = level;
1381 /* Push a definition or a declaration of struct, union or enum tag "name".
1382 "type" should be the type node.
1383 We assume that the tag "name" is not already defined.
1385 Note that the definition may really be just a forward reference.
1386 In that case, the TYPE_SIZE will be zero. */
1389 pushtag (name, type)
1392 register struct binding_level *b;
1394 /* Find the proper binding level for this type tag. */
1396 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1401 /* Record the identifier as the type's name if it has none. */
1403 if (TYPE_NAME (type) == 0)
1404 TYPE_NAME (type) = name;
1407 b->tags = tree_cons (name, type, b->tags);
1409 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1410 tagged type we just added to the current binding level. This fake
1411 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1412 to output a representation of a tagged type, and it also gives
1413 us a convenient place to record the "scope start" address for the
1416 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1418 /* An approximation for now, so we can tell this is a function-scope tag.
1419 This will be updated in poplevel. */
1420 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1423 /* Handle when a new declaration NEWDECL
1424 has the same name as an old one OLDDECL
1425 in the same binding contour.
1426 Prints an error message if appropriate.
1428 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1429 Otherwise, return 0.
1431 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1432 and OLDDECL is in an outer binding level and should thus not be changed. */
1435 duplicate_decls (newdecl, olddecl, different_binding_level)
1436 register tree newdecl, olddecl;
1437 int different_binding_level;
1439 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1440 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1441 && DECL_INITIAL (newdecl) != 0);
1442 tree oldtype = TREE_TYPE (olddecl);
1443 tree newtype = TREE_TYPE (newdecl);
1446 if (DECL_P (olddecl))
1447 DECL_MACHINE_ATTRIBUTES (newdecl)
1448 = merge_machine_decl_attributes (olddecl, newdecl);
1450 if (TREE_CODE (newtype) == ERROR_MARK
1451 || TREE_CODE (oldtype) == ERROR_MARK)
1454 /* New decl is completely inconsistent with the old one =>
1455 tell caller to replace the old one.
1456 This is always an error except in the case of shadowing a builtin. */
1457 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1459 if (TREE_CODE (olddecl) == FUNCTION_DECL
1460 && (DECL_BUILT_IN (olddecl)
1461 || DECL_BUILT_IN_NONANSI (olddecl)))
1463 /* If you declare a built-in or predefined function name as static,
1464 the old definition is overridden,
1465 but optionally warn this was a bad choice of name. */
1466 if (!TREE_PUBLIC (newdecl))
1470 else if (DECL_BUILT_IN (olddecl))
1471 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1473 warning_with_decl (newdecl, "shadowing library function `%s'");
1475 /* Likewise, if the built-in is not ansi, then programs can
1476 override it even globally without an error. */
1477 else if (! DECL_BUILT_IN (olddecl))
1478 warning_with_decl (newdecl,
1479 "library function `%s' declared as non-function");
1481 else if (DECL_BUILT_IN_NONANSI (olddecl))
1482 warning_with_decl (newdecl,
1483 "built-in function `%s' declared as non-function");
1485 warning_with_decl (newdecl,
1486 "built-in function `%s' declared as non-function");
1490 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1491 error_with_decl (olddecl, "previous declaration of `%s'");
1497 /* For real parm decl following a forward decl,
1498 return 1 so old decl will be reused. */
1499 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1500 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1503 /* The new declaration is the same kind of object as the old one.
1504 The declarations may partially match. Print warnings if they don't
1505 match enough. Ultimately, copy most of the information from the new
1506 decl to the old one, and keep using the old one. */
1508 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1509 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1510 && DECL_INITIAL (olddecl) == 0)
1511 /* If -traditional, avoid error for redeclaring fcn
1512 after implicit decl. */
1514 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1515 && DECL_BUILT_IN (olddecl))
1517 /* A function declaration for a built-in function. */
1518 if (!TREE_PUBLIC (newdecl))
1520 /* If you declare a built-in function name as static, the
1521 built-in definition is overridden,
1522 but optionally warn this was a bad choice of name. */
1524 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1525 /* Discard the old built-in function. */
1528 else if (!types_match)
1530 /* Accept the return type of the new declaration if same modes. */
1531 tree oldreturntype = TREE_TYPE (oldtype);
1532 tree newreturntype = TREE_TYPE (newtype);
1534 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1536 /* Function types may be shared, so we can't just modify
1537 the return type of olddecl's function type. */
1539 = build_function_type (newreturntype,
1540 TYPE_ARG_TYPES (oldtype));
1542 types_match = comptypes (newtype, trytype);
1546 /* Accept harmless mismatch in first argument type also.
1548 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1549 && TYPE_ARG_TYPES (oldtype) != 0
1550 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1551 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1552 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1553 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1555 /* Function types may be shared, so we can't just modify
1556 the return type of olddecl's function type. */
1558 = build_function_type (TREE_TYPE (oldtype),
1559 tree_cons (NULL_TREE,
1560 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1561 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1563 types_match = comptypes (newtype, trytype);
1567 if (! different_binding_level)
1568 TREE_TYPE (olddecl) = oldtype;
1572 /* If types don't match for a built-in, throw away the built-in. */
1573 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1577 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1578 && DECL_SOURCE_LINE (olddecl) == 0)
1580 /* A function declaration for a predeclared function
1581 that isn't actually built in. */
1582 if (!TREE_PUBLIC (newdecl))
1584 /* If you declare it as static, the
1585 default definition is overridden. */
1588 else if (!types_match)
1590 /* If the types don't match, preserve volatility indication.
1591 Later on, we will discard everything else about the
1592 default declaration. */
1593 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1596 /* Permit char *foo () to match void *foo (...) if not pedantic,
1597 if one of them came from a system header file. */
1598 else if (!types_match
1599 && TREE_CODE (olddecl) == FUNCTION_DECL
1600 && TREE_CODE (newdecl) == FUNCTION_DECL
1601 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1602 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1603 && (DECL_IN_SYSTEM_HEADER (olddecl)
1604 || DECL_IN_SYSTEM_HEADER (newdecl))
1605 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1606 && TYPE_ARG_TYPES (oldtype) == 0
1607 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1608 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1610 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1611 && TYPE_ARG_TYPES (newtype) == 0
1612 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1613 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1616 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1617 /* Make sure we keep void * as ret type, not char *. */
1618 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1619 TREE_TYPE (newdecl) = newtype = oldtype;
1621 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1622 we will come back here again. */
1623 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1625 else if (!types_match
1626 /* Permit char *foo (int, ...); followed by char *foo ();
1628 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1630 /* Return types must still match. */
1631 && comptypes (TREE_TYPE (oldtype),
1632 TREE_TYPE (newtype))
1633 && TYPE_ARG_TYPES (newtype) == 0))
1635 error_with_decl (newdecl, "conflicting types for `%s'");
1636 /* Check for function type mismatch
1637 involving an empty arglist vs a nonempty one. */
1638 if (TREE_CODE (olddecl) == FUNCTION_DECL
1639 && comptypes (TREE_TYPE (oldtype),
1640 TREE_TYPE (newtype))
1641 && ((TYPE_ARG_TYPES (oldtype) == 0
1642 && DECL_INITIAL (olddecl) == 0)
1644 (TYPE_ARG_TYPES (newtype) == 0
1645 && DECL_INITIAL (newdecl) == 0)))
1647 /* Classify the problem further. */
1648 register tree t = TYPE_ARG_TYPES (oldtype);
1650 t = TYPE_ARG_TYPES (newtype);
1651 for (; t; t = TREE_CHAIN (t))
1653 register tree type = TREE_VALUE (t);
1655 if (TREE_CHAIN (t) == 0
1656 && TYPE_MAIN_VARIANT (type) != void_type_node)
1658 error ("A parameter list with an ellipsis can't match an empty parameter name list declaration.");
1662 if (simple_type_promotes_to (type) != NULL_TREE)
1664 error ("An argument type that has a default promotion can't match an empty parameter name list declaration.");
1669 error_with_decl (olddecl, "previous declaration of `%s'");
1673 errmsg = redeclaration_error_message (newdecl, olddecl);
1679 error_with_decl (newdecl, "redefinition of `%s'");
1682 error_with_decl (newdecl, "redeclaration of `%s'");
1685 error_with_decl (newdecl, "conflicting declarations of `%s'");
1691 error_with_decl (olddecl,
1692 ((DECL_INITIAL (olddecl)
1693 && current_binding_level == global_binding_level)
1694 ? "`%s' previously defined here"
1695 : "`%s' previously declared here"));
1697 else if (TREE_CODE (newdecl) == TYPE_DECL
1698 && (DECL_IN_SYSTEM_HEADER (olddecl)
1699 || DECL_IN_SYSTEM_HEADER (newdecl)))
1701 warning_with_decl (newdecl, "redefinition of `%s'");
1704 ((DECL_INITIAL (olddecl)
1705 && current_binding_level == global_binding_level)
1706 ? "`%s' previously defined here"
1707 : "`%s' previously declared here"));
1709 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1710 && DECL_INITIAL (olddecl) != 0
1711 && TYPE_ARG_TYPES (oldtype) == 0
1712 && TYPE_ARG_TYPES (newtype) != 0
1713 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1715 register tree type, parm;
1717 /* Prototype decl follows defn w/o prototype. */
1719 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1720 type = TYPE_ARG_TYPES (newtype),
1723 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1725 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1726 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1728 warning_with_decl (newdecl, "prototype for `%s' follows");
1729 warning_with_decl (olddecl, "non-prototype definition here");
1732 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1733 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1735 error_with_decl (newdecl,
1736 "prototype for `%s' follows and number of arguments doesn't match");
1737 error_with_decl (olddecl, "non-prototype definition here");
1741 /* Type for passing arg must be consistent
1742 with that declared for the arg. */
1743 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1744 /* If -traditional, allow `unsigned int' instead of `int'
1745 in the prototype. */
1746 && (! (flag_traditional
1747 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1748 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1750 error_with_decl (newdecl,
1751 "prototype for `%s' follows and argument %d doesn't match",
1753 error_with_decl (olddecl, "non-prototype definition here");
1759 /* Warn about mismatches in various flags. */
1762 /* Warn if function is now inline
1763 but was previously declared not inline and has been called. */
1764 if (TREE_CODE (olddecl) == FUNCTION_DECL
1765 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1766 && TREE_USED (olddecl))
1767 warning_with_decl (newdecl,
1768 "`%s' declared inline after being called");
1769 if (TREE_CODE (olddecl) == FUNCTION_DECL
1770 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1771 && DECL_INITIAL (olddecl) != 0)
1772 warning_with_decl (newdecl,
1773 "`%s' declared inline after its definition");
1775 /* If pedantic, warn when static declaration follows a non-static
1776 declaration. Otherwise, do so only for functions. */
1777 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1778 && TREE_PUBLIC (olddecl)
1779 && !TREE_PUBLIC (newdecl))
1780 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1782 /* If warn_traditional, warn when a non-static function
1783 declaration follows a static one. */
1784 if (warn_traditional && !in_system_header
1785 && TREE_CODE (olddecl) == FUNCTION_DECL
1786 && !TREE_PUBLIC (olddecl)
1787 && TREE_PUBLIC (newdecl))
1788 warning_with_decl (newdecl, "non-static declaration for `%s' follows static");
1790 /* Warn when const declaration follows a non-const
1791 declaration, but not for functions. */
1792 if (TREE_CODE (olddecl) != FUNCTION_DECL
1793 && !TREE_READONLY (olddecl)
1794 && TREE_READONLY (newdecl))
1795 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1796 /* These bits are logically part of the type, for variables.
1797 But not for functions
1798 (where qualifiers are not valid ANSI anyway). */
1799 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1800 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1801 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1802 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1806 /* Optionally warn about more than one declaration for the same name. */
1807 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1808 /* Don't warn about a function declaration
1809 followed by a definition. */
1810 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1811 && DECL_INITIAL (olddecl) == 0)
1812 /* Don't warn about extern decl followed by (tentative) definition. */
1813 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1815 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1816 warning_with_decl (olddecl, "previous declaration of `%s'");
1819 /* Copy all the DECL_... slots specified in the new decl
1820 except for any that we copy here from the old type.
1822 Past this point, we don't change OLDTYPE and NEWTYPE
1823 even if we change the types of NEWDECL and OLDDECL. */
1827 /* When copying info to olddecl, we store into write_olddecl
1828 instead. This allows us to avoid modifying olddecl when
1829 different_binding_level is true. */
1830 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1832 /* Merge the data types specified in the two decls. */
1833 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1835 if (different_binding_level)
1837 = build_type_attribute_variant
1839 merge_attributes (TYPE_ATTRIBUTES (newtype),
1840 TYPE_ATTRIBUTES (oldtype)));
1843 = TREE_TYPE (olddecl)
1844 = common_type (newtype, oldtype);
1847 /* Lay the type out, unless already done. */
1848 if (oldtype != TREE_TYPE (newdecl))
1850 if (TREE_TYPE (newdecl) != error_mark_node)
1851 layout_type (TREE_TYPE (newdecl));
1852 if (TREE_CODE (newdecl) != FUNCTION_DECL
1853 && TREE_CODE (newdecl) != TYPE_DECL
1854 && TREE_CODE (newdecl) != CONST_DECL)
1855 layout_decl (newdecl, 0);
1859 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1860 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1861 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1862 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1863 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1864 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1866 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1867 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1871 /* Keep the old rtl since we can safely use it. */
1872 DECL_RTL (newdecl) = DECL_RTL (olddecl);
1874 /* Merge the type qualifiers. */
1875 if (TREE_CODE (olddecl) == FUNCTION_DECL
1876 && DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1877 && ! TREE_THIS_VOLATILE (newdecl))
1878 TREE_THIS_VOLATILE (write_olddecl) = 0;
1880 if (TREE_READONLY (newdecl))
1881 TREE_READONLY (write_olddecl) = 1;
1883 if (TREE_THIS_VOLATILE (newdecl))
1885 TREE_THIS_VOLATILE (write_olddecl) = 1;
1886 if (TREE_CODE (newdecl) == VAR_DECL
1887 /* If an automatic variable is re-declared in the same
1888 function scope, but the old declaration was not
1889 volatile, make_var_volatile() would crash because the
1890 variable would have been assigned to a pseudo, not a
1891 MEM. Since this duplicate declaration is invalid
1892 anyway, we just skip the call. */
1894 make_var_volatile (newdecl);
1897 /* Keep source location of definition rather than declaration. */
1898 /* When called with different_binding_level set, keep the old
1899 information so that meaningful diagnostics can be given. */
1900 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1901 && ! different_binding_level)
1903 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1904 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1907 /* Merge the unused-warning information. */
1908 if (DECL_IN_SYSTEM_HEADER (olddecl))
1909 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1910 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1911 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1913 /* Merge the initialization information. */
1914 /* When called with different_binding_level set, don't copy over
1915 DECL_INITIAL, so that we don't accidentally change function
1916 declarations into function definitions. */
1917 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1918 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1920 /* Merge the section attribute.
1921 We want to issue an error if the sections conflict but that must be
1922 done later in decl_attributes since we are called before attributes
1924 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1925 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1927 /* Copy the assembler name.
1928 Currently, it can only be defined in the prototype. */
1929 DECL_ASSEMBLER_NAME (newdecl) = DECL_ASSEMBLER_NAME (olddecl);
1931 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1933 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1934 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1936 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1937 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1938 DECL_NO_CHECK_MEMORY_USAGE (newdecl)
1939 |= DECL_NO_CHECK_MEMORY_USAGE (olddecl);
1940 DECL_NO_LIMIT_STACK (newdecl)
1941 |= DECL_NO_LIMIT_STACK (olddecl);
1944 /* If cannot merge, then use the new type and qualifiers,
1945 and don't preserve the old rtl. */
1946 else if (! different_binding_level)
1948 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1949 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1950 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1951 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1954 /* Merge the storage class information. */
1955 DECL_WEAK (newdecl) |= DECL_WEAK (olddecl);
1956 /* For functions, static overrides non-static. */
1957 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1959 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1960 /* This is since we don't automatically
1961 copy the attributes of NEWDECL into OLDDECL. */
1962 /* No need to worry about different_binding_level here because
1963 then TREE_PUBLIC (newdecl) was true. */
1964 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1965 /* If this clears `static', clear it in the identifier too. */
1966 if (! TREE_PUBLIC (olddecl))
1967 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1969 if (DECL_EXTERNAL (newdecl))
1971 if (! different_binding_level)
1973 /* Don't mess with these flags on local externs; they remain
1974 external even if there's a declaration at file scope which
1976 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1977 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1979 /* An extern decl does not override previous storage class. */
1980 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1981 if (! DECL_EXTERNAL (newdecl))
1982 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1986 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1987 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1990 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1992 /* If either decl says `inline', this fn is inline,
1993 unless its definition was passed already. */
1994 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
1995 DECL_INLINE (olddecl) = 1;
1997 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1999 if (DECL_BUILT_IN (olddecl))
2001 /* Get rid of any built-in function if new arg types don't match it
2002 or if we have a function definition. */
2003 if (! types_match || new_is_definition)
2005 if (! different_binding_level)
2007 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
2008 DECL_BUILT_IN_CLASS (olddecl) = NOT_BUILT_IN;
2013 /* If redeclaring a builtin function, and not a definition,
2014 it stays built in. */
2015 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2016 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2019 /* Also preserve various other info from the definition. */
2020 else if (! new_is_definition)
2021 DECL_FRAME_SIZE (newdecl) = DECL_FRAME_SIZE (olddecl);
2022 if (! new_is_definition)
2024 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2025 /* When called with different_binding_level set, don't copy over
2026 DECL_INITIAL, so that we don't accidentally change function
2027 declarations into function definitions. */
2028 if (! different_binding_level)
2029 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2030 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
2031 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2032 if (DECL_INLINE (newdecl))
2033 DECL_ABSTRACT_ORIGIN (newdecl) = DECL_ABSTRACT_ORIGIN (olddecl);
2036 if (different_binding_level)
2039 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2040 But preserve OLDDECL's DECL_UID. */
2042 register unsigned olddecl_uid = DECL_UID (olddecl);
2044 bcopy ((char *) newdecl + sizeof (struct tree_common),
2045 (char *) olddecl + sizeof (struct tree_common),
2046 sizeof (struct tree_decl) - sizeof (struct tree_common));
2047 DECL_UID (olddecl) = olddecl_uid;
2050 /* NEWDECL contains the merged attribute lists.
2051 Update OLDDECL to be the same. */
2052 DECL_MACHINE_ATTRIBUTES (olddecl) = DECL_MACHINE_ATTRIBUTES (newdecl);
2057 /* Record a decl-node X as belonging to the current lexical scope.
2058 Check for errors (such as an incompatible declaration for the same
2059 name already seen in the same scope).
2061 Returns either X or an old decl for the same name.
2062 If an old decl is returned, it may have been smashed
2063 to agree with what X says. */
2070 register tree name = DECL_NAME (x);
2071 register struct binding_level *b = current_binding_level;
2073 DECL_CONTEXT (x) = current_function_decl;
2074 /* A local extern declaration for a function doesn't constitute nesting.
2075 A local auto declaration does, since it's a forward decl
2076 for a nested function coming later. */
2077 if ((TREE_CODE (x) == FUNCTION_DECL || TREE_CODE (x) == VAR_DECL)
2078 && DECL_INITIAL (x) == 0 && DECL_EXTERNAL (x))
2079 DECL_CONTEXT (x) = 0;
2081 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
2082 && x != IDENTIFIER_IMPLICIT_DECL (name)
2083 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
2084 && !DECL_IN_SYSTEM_HEADER (x))
2085 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
2091 int different_binding_level = 0;
2093 t = lookup_name_current_level (name);
2094 /* Don't type check externs here when -traditional. This is so that
2095 code with conflicting declarations inside blocks will get warnings
2096 not errors. X11 for instance depends on this. */
2097 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
2099 t = IDENTIFIER_GLOBAL_VALUE (name);
2100 /* Type decls at global scope don't conflict with externs declared
2101 inside lexical blocks. */
2102 if (t && TREE_CODE (t) == TYPE_DECL)
2104 different_binding_level = 1;
2106 if (t != 0 && t == error_mark_node)
2107 /* error_mark_node is 0 for a while during initialization! */
2110 error_with_decl (x, "`%s' used prior to declaration");
2115 file = DECL_SOURCE_FILE (t);
2116 line = DECL_SOURCE_LINE (t);
2119 /* If this decl is `static' and an implicit decl was seen previously,
2120 warn. But don't complain if -traditional,
2121 since traditional compilers don't complain. */
2122 if (! flag_traditional && TREE_PUBLIC (name)
2123 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2124 sets this for all functions. */
2125 && ! TREE_PUBLIC (x)
2126 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2127 /* We used to warn also for explicit extern followed by static,
2128 but sometimes you need to do it that way. */
2129 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2131 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2132 IDENTIFIER_POINTER (name));
2133 pedwarn_with_file_and_line
2134 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2135 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2136 "previous declaration of `%s'",
2137 IDENTIFIER_POINTER (name));
2138 TREE_THIS_VOLATILE (name) = 1;
2141 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2143 if (TREE_CODE (t) == PARM_DECL)
2145 /* Don't allow more than one "real" duplicate
2146 of a forward parm decl. */
2147 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2153 /* If we are processing a typedef statement, generate a whole new
2154 ..._TYPE node (which will be just an variant of the existing
2155 ..._TYPE node with identical properties) and then install the
2156 TYPE_DECL node generated to represent the typedef name as the
2157 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2159 The whole point here is to end up with a situation where each
2160 and every ..._TYPE node the compiler creates will be uniquely
2161 associated with AT MOST one node representing a typedef name.
2162 This way, even though the compiler substitutes corresponding
2163 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2164 early on, later parts of the compiler can always do the reverse
2165 translation and get back the corresponding typedef name. For
2168 typedef struct S MY_TYPE;
2171 Later parts of the compiler might only know that `object' was of
2172 type `struct S' if it were not for code just below. With this
2173 code however, later parts of the compiler see something like:
2175 struct S' == struct S
2176 typedef struct S' MY_TYPE;
2179 And they can then deduce (from the node for type struct S') that
2180 the original object declaration was:
2184 Being able to do this is important for proper support of protoize,
2185 and also for generating precise symbolic debugging information
2186 which takes full account of the programmer's (typedef) vocabulary.
2188 Obviously, we don't want to generate a duplicate ..._TYPE node if
2189 the TYPE_DECL node that we are now processing really represents a
2190 standard built-in type.
2192 Since all standard types are effectively declared at line zero
2193 in the source file, we can easily check to see if we are working
2194 on a standard type by checking the current value of lineno. */
2196 if (TREE_CODE (x) == TYPE_DECL)
2198 if (DECL_SOURCE_LINE (x) == 0)
2200 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2201 TYPE_NAME (TREE_TYPE (x)) = x;
2203 else if (TREE_TYPE (x) != error_mark_node
2204 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2206 tree tt = TREE_TYPE (x);
2207 DECL_ORIGINAL_TYPE (x) = tt;
2208 tt = build_type_copy (tt);
2210 TREE_USED (tt) = TREE_USED (x);
2215 /* Multiple external decls of the same identifier ought to match.
2216 Check against both global declarations (when traditional) and out of
2217 scope (limbo) block level declarations.
2219 We get warnings about inline functions where they are defined.
2220 Avoid duplicate warnings where they are used. */
2222 && ! (TREE_CODE (x) == FUNCTION_DECL && DECL_INLINE (x)))
2226 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2227 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2228 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2229 decl = IDENTIFIER_GLOBAL_VALUE (name);
2230 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2231 /* Decls in limbo are always extern, so no need to check that. */
2232 decl = IDENTIFIER_LIMBO_VALUE (name);
2236 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2237 /* If old decl is built-in, we already warned if we should. */
2238 && !DECL_BUILT_IN (decl))
2240 pedwarn_with_decl (x,
2241 "type mismatch with previous external decl");
2242 pedwarn_with_decl (decl, "previous external decl of `%s'");
2246 /* If a function has had an implicit declaration, and then is defined,
2247 make sure they are compatible. */
2249 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2250 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2251 && TREE_CODE (x) == FUNCTION_DECL
2252 && ! comptypes (TREE_TYPE (x),
2253 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2255 warning_with_decl (x, "type mismatch with previous implicit declaration");
2256 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2257 "previous implicit declaration of `%s'");
2260 /* In PCC-compatibility mode, extern decls of vars with no current decl
2261 take effect at top level no matter where they are. */
2262 if (flag_traditional && DECL_EXTERNAL (x)
2263 && lookup_name (name) == 0)
2265 tree type = TREE_TYPE (x);
2267 /* But don't do this if the type contains temporary nodes. */
2270 if (type == error_mark_node)
2272 if (TYPE_CONTEXT (type))
2274 warning_with_decl (x, "type of external `%s' is not global");
2275 /* By exiting the loop early, we leave TYPE nonzero,
2276 and thus prevent globalization of the decl. */
2279 else if (TREE_CODE (type) == FUNCTION_TYPE
2280 && TYPE_ARG_TYPES (type) != 0)
2281 /* The types might not be truly local,
2282 but the list of arg types certainly is temporary.
2283 Since prototypes are nontraditional,
2284 ok not to do the traditional thing. */
2286 type = TREE_TYPE (type);
2290 b = global_binding_level;
2293 /* This name is new in its binding level.
2294 Install the new declaration and return it. */
2295 if (b == global_binding_level)
2297 /* Install a global value. */
2299 /* If the first global decl has external linkage,
2300 warn if we later see static one. */
2301 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2302 TREE_PUBLIC (name) = 1;
2304 IDENTIFIER_GLOBAL_VALUE (name) = x;
2306 /* We no longer care about any previous block level declarations. */
2307 IDENTIFIER_LIMBO_VALUE (name) = 0;
2309 /* Don't forget if the function was used via an implicit decl. */
2310 if (IDENTIFIER_IMPLICIT_DECL (name)
2311 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2312 TREE_USED (x) = 1, TREE_USED (name) = 1;
2314 /* Don't forget if its address was taken in that way. */
2315 if (IDENTIFIER_IMPLICIT_DECL (name)
2316 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2317 TREE_ADDRESSABLE (x) = 1;
2319 /* Warn about mismatches against previous implicit decl. */
2320 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2321 /* If this real decl matches the implicit, don't complain. */
2322 && ! (TREE_CODE (x) == FUNCTION_DECL
2323 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2324 == integer_type_node)))
2325 pedwarn ("`%s' was previously implicitly declared to return `int'",
2326 IDENTIFIER_POINTER (name));
2328 /* If this decl is `static' and an `extern' was seen previously,
2329 that is erroneous. */
2330 if (TREE_PUBLIC (name)
2331 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2333 /* Okay to redeclare an ANSI built-in as static. */
2334 if (t != 0 && DECL_BUILT_IN (t))
2336 /* Okay to declare a non-ANSI built-in as anything. */
2337 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2339 /* Okay to have global type decl after an earlier extern
2340 declaration inside a lexical block. */
2341 else if (TREE_CODE (x) == TYPE_DECL)
2343 else if (IDENTIFIER_IMPLICIT_DECL (name))
2345 if (! TREE_THIS_VOLATILE (name))
2346 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2347 IDENTIFIER_POINTER (name));
2350 pedwarn ("`%s' was declared `extern' and later `static'",
2351 IDENTIFIER_POINTER (name));
2356 /* Here to install a non-global value. */
2357 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2358 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2360 IDENTIFIER_LOCAL_VALUE (name) = x;
2362 /* If this is an extern function declaration, see if we
2363 have a global definition or declaration for the function. */
2366 && TREE_CODE (x) == FUNCTION_DECL
2367 && TREE_CODE (oldglobal) == FUNCTION_DECL
2368 && DECL_EXTERNAL (x) && ! DECL_INLINE (x))
2370 /* We have one. Their types must agree. */
2371 if (! comptypes (TREE_TYPE (x),
2372 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2373 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2376 /* Inner extern decl is inline if global one is.
2377 Copy enough to really inline it. */
2378 if (DECL_INLINE (oldglobal))
2380 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2381 DECL_INITIAL (x) = (current_function_decl == oldglobal
2382 ? 0 : DECL_INITIAL (oldglobal));
2383 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2384 DECL_FRAME_SIZE (x) = DECL_FRAME_SIZE (oldglobal);
2385 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2386 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2387 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2388 DECL_ABSTRACT_ORIGIN (x)
2389 = DECL_ABSTRACT_ORIGIN (oldglobal);
2391 /* Inner extern decl is built-in if global one is. */
2392 if (DECL_BUILT_IN (oldglobal))
2394 DECL_BUILT_IN_CLASS (x) = DECL_BUILT_IN_CLASS (oldglobal);
2395 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2397 /* Keep the arg types from a file-scope fcn defn. */
2398 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2399 && DECL_INITIAL (oldglobal)
2400 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2401 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2406 /* This case is probably sometimes the right thing to do. */
2407 /* If we have a local external declaration,
2408 then any file-scope declaration should not
2409 have been static. */
2410 if (oldlocal == 0 && oldglobal != 0
2411 && !TREE_PUBLIC (oldglobal)
2412 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2413 warning ("`%s' locally external but globally static",
2414 IDENTIFIER_POINTER (name));
2417 /* If we have a local external declaration,
2418 and no file-scope declaration has yet been seen,
2419 then if we later have a file-scope decl it must not be static. */
2421 && DECL_EXTERNAL (x)
2425 TREE_PUBLIC (name) = 1;
2427 /* Save this decl, so that we can do type checking against
2428 other decls after it falls out of scope.
2430 Only save it once. This prevents temporary decls created in
2431 expand_inline_function from being used here, since this
2432 will have been set when the inline function was parsed.
2433 It also helps give slightly better warnings. */
2434 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2435 IDENTIFIER_LIMBO_VALUE (name) = x;
2438 /* Warn if shadowing an argument at the top level of the body. */
2439 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2440 /* This warning doesn't apply to the parms of a nested fcn. */
2441 && ! current_binding_level->parm_flag
2442 /* Check that this is one level down from the parms. */
2443 && current_binding_level->level_chain->parm_flag
2444 /* Check that the decl being shadowed
2445 comes from the parm level, one level up. */
2446 && chain_member (oldlocal, current_binding_level->level_chain->names))
2448 if (TREE_CODE (oldlocal) == PARM_DECL)
2449 pedwarn ("declaration of `%s' shadows a parameter",
2450 IDENTIFIER_POINTER (name));
2452 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2453 IDENTIFIER_POINTER (name));
2456 /* Maybe warn if shadowing something else. */
2457 else if (warn_shadow && !DECL_EXTERNAL (x)
2458 /* No shadow warnings for internally generated vars. */
2459 && DECL_SOURCE_LINE (x) != 0
2460 /* No shadow warnings for vars made for inlining. */
2461 && ! DECL_FROM_INLINE (x))
2463 const char *id = IDENTIFIER_POINTER (name);
2465 if (TREE_CODE (x) == PARM_DECL
2466 && current_binding_level->level_chain->parm_flag)
2467 /* Don't warn about the parm names in function declarator
2468 within a function declarator.
2469 It would be nice to avoid warning in any function
2470 declarator in a declaration, as opposed to a definition,
2471 but there is no way to tell it's not a definition. */
2473 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2474 warning ("declaration of `%s' shadows a parameter", id);
2475 else if (oldlocal != 0)
2476 warning ("declaration of `%s' shadows previous local", id);
2477 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2478 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2479 warning ("declaration of `%s' shadows global declaration", id);
2482 /* If storing a local value, there may already be one (inherited).
2483 If so, record it for restoration when this binding level ends. */
2485 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2488 /* Keep count of variables in this level with incomplete type.
2489 If the input is erroneous, we can have error_mark in the type
2490 slot (e.g. "f(void a, ...)") - that doesn't count as an
2492 if (TREE_TYPE (x) != error_mark_node
2493 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2497 /* Put decls on list in reverse order.
2498 We will reverse them later if necessary. */
2499 TREE_CHAIN (x) = b->names;
2505 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2508 pushdecl_top_level (x)
2512 register struct binding_level *b = current_binding_level;
2514 current_binding_level = global_binding_level;
2516 current_binding_level = b;
2520 /* Generate an implicit declaration for identifier FUNCTIONID
2521 as a function of type int (). Print a warning if appropriate. */
2524 implicitly_declare (functionid)
2528 int traditional_warning = 0;
2529 /* Only one "implicit declaration" warning per identifier. */
2530 int implicit_warning;
2532 /* We used to reuse an old implicit decl here,
2533 but this loses with inline functions because it can clobber
2534 the saved decl chains. */
2536 if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2537 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2540 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2542 /* Warn of implicit decl following explicit local extern decl.
2543 This is probably a program designed for traditional C. */
2544 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2545 traditional_warning = 1;
2547 /* Warn once of an implicit declaration. */
2548 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2550 DECL_EXTERNAL (decl) = 1;
2551 TREE_PUBLIC (decl) = 1;
2553 /* Record that we have an implicit decl and this is it. */
2554 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2556 /* ANSI standard says implicit declarations are in the innermost block.
2557 So we record the decl in the standard fashion.
2558 If flag_traditional is set, pushdecl does it top-level. */
2561 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2562 maybe_objc_check_decl (decl);
2564 rest_of_decl_compilation (decl, NULL_PTR, 0, 0);
2566 if (implicit_warning)
2567 implicit_decl_warning (functionid);
2568 else if (warn_traditional && traditional_warning)
2569 warning ("function `%s' was previously declared within a block",
2570 IDENTIFIER_POINTER (functionid));
2572 /* Write a record describing this implicit function declaration to the
2573 prototypes file (if requested). */
2575 gen_aux_info_record (decl, 0, 1, 0);
2581 implicit_decl_warning (id)
2584 const char *name = IDENTIFIER_POINTER (id);
2585 if (mesg_implicit_function_declaration == 2)
2586 error ("implicit declaration of function `%s'", name);
2587 else if (mesg_implicit_function_declaration == 1)
2588 warning ("implicit declaration of function `%s'", name);
2591 /* Return zero if the declaration NEWDECL is valid
2592 when the declaration OLDDECL (assumed to be for the same name)
2593 has already been seen.
2594 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
2595 and 3 if it is a conflicting declaration. */
2598 redeclaration_error_message (newdecl, olddecl)
2599 tree newdecl, olddecl;
2601 if (TREE_CODE (newdecl) == TYPE_DECL)
2603 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2605 /* pushdecl creates distinct types for TYPE_DECLs by calling
2606 build_type_copy, so the above comparison generally fails. We do
2607 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2608 is equivalent to what this code used to do before the build_type_copy
2609 call. The variant type distinction should not matter for traditional
2610 code, because it doesn't have type qualifiers. */
2611 if (flag_traditional
2612 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
2614 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2618 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2620 /* Declarations of functions can insist on internal linkage
2621 but they can't be inconsistent with internal linkage,
2622 so there can be no error on that account.
2623 However defining the same name twice is no good. */
2624 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2625 /* However, defining once as extern inline and a second
2626 time in another way is ok. */
2627 && ! (DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2628 && ! (DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2632 else if (DECL_CONTEXT (newdecl) == NULL_TREE)
2634 /* Objects declared at top level: */
2635 /* If at least one is a reference, it's ok. */
2636 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2638 /* Reject two definitions. */
2639 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2641 /* Now we have two tentative defs, or one tentative and one real def. */
2642 /* Insist that the linkage match. */
2643 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2647 else if (current_binding_level->parm_flag
2648 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2652 /* Newdecl has block scope. If olddecl has block scope also, then
2653 reject two definitions, and reject a definition together with an
2654 external reference. Otherwise, it is OK, because newdecl must
2655 be an extern reference to olddecl. */
2656 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2657 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2663 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2664 Create one if none exists so far for the current function.
2665 This function is called for both label definitions and label references. */
2671 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2673 if (current_function_decl == 0)
2675 error ("label %s referenced outside of any function",
2676 IDENTIFIER_POINTER (id));
2680 /* Use a label already defined or ref'd with this name. */
2683 /* But not if it is inherited and wasn't declared to be inheritable. */
2684 if (DECL_CONTEXT (decl) != current_function_decl
2685 && ! C_DECLARED_LABEL_FLAG (decl))
2686 return shadow_label (id);
2690 decl = build_decl (LABEL_DECL, id, void_type_node);
2692 /* A label not explicitly declared must be local to where it's ref'd. */
2693 DECL_CONTEXT (decl) = current_function_decl;
2695 DECL_MODE (decl) = VOIDmode;
2697 /* Say where one reference is to the label,
2698 for the sake of the error if it is not defined. */
2699 DECL_SOURCE_LINE (decl) = lineno;
2700 DECL_SOURCE_FILE (decl) = input_filename;
2702 IDENTIFIER_LABEL_VALUE (id) = decl;
2704 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2709 /* Make a label named NAME in the current function,
2710 shadowing silently any that may be inherited from containing functions
2711 or containing scopes.
2713 Note that valid use, if the label being shadowed
2714 comes from another scope in the same function,
2715 requires calling declare_nonlocal_label right away. */
2721 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2727 /* Check to make sure that the label hasn't already been declared
2728 at this label scope */
2729 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2730 if (TREE_VALUE (dup) == decl)
2732 error ("duplicate label declaration `%s'",
2733 IDENTIFIER_POINTER (name));
2734 error_with_decl (TREE_VALUE (dup),
2735 "this is a previous declaration");
2736 /* Just use the previous declaration. */
2737 return lookup_label (name);
2740 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2741 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2744 return lookup_label (name);
2747 /* Define a label, specifying the location in the source file.
2748 Return the LABEL_DECL node for the label, if the definition is valid.
2749 Otherwise return 0. */
2752 define_label (filename, line, name)
2753 const char *filename;
2757 tree decl = lookup_label (name);
2759 /* If label with this name is known from an outer context, shadow it. */
2760 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2762 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2763 IDENTIFIER_LABEL_VALUE (name) = 0;
2764 decl = lookup_label (name);
2767 if (warn_traditional && !in_system_header && lookup_name (name))
2768 warning_with_file_and_line (filename, line,
2769 "traditional C lacks a separate namespace for labels, identifier `%s' conflicts",
2770 IDENTIFIER_POINTER (name));
2772 if (DECL_INITIAL (decl) != 0)
2774 error_with_file_and_line (filename, line, "duplicate label `%s'",
2775 IDENTIFIER_POINTER (name));
2780 /* Mark label as having been defined. */
2781 DECL_INITIAL (decl) = error_mark_node;
2782 /* Say where in the source. */
2783 DECL_SOURCE_FILE (decl) = filename;
2784 DECL_SOURCE_LINE (decl) = line;
2789 /* Return the list of declarations of the current level.
2790 Note that this list is in reverse order unless/until
2791 you nreverse it; and when you do nreverse it, you must
2792 store the result back using `storedecls' or you will lose. */
2797 return current_binding_level->names;
2800 /* Return the list of type-tags (for structs, etc) of the current level. */
2805 return current_binding_level->tags;
2808 /* Store the list of declarations of the current level.
2809 This is done for the parameter declarations of a function being defined,
2810 after they are modified in the light of any missing parameters. */
2816 current_binding_level->names = decls;
2819 /* Similarly, store the list of tags of the current level. */
2825 current_binding_level->tags = tags;
2828 /* Given NAME, an IDENTIFIER_NODE,
2829 return the structure (or union or enum) definition for that name.
2830 Searches binding levels from BINDING_LEVEL up to the global level.
2831 If THISLEVEL_ONLY is nonzero, searches only the specified context
2832 (but skips any tag-transparent contexts to find one that is
2833 meaningful for tags).
2834 CODE says which kind of type the caller wants;
2835 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2836 If the wrong kind of type is found, an error is reported. */
2839 lookup_tag (code, name, binding_level, thislevel_only)
2840 enum tree_code code;
2841 struct binding_level *binding_level;
2845 register struct binding_level *level;
2847 for (level = binding_level; level; level = level->level_chain)
2850 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2852 if (TREE_PURPOSE (tail) == name)
2854 if (TREE_CODE (TREE_VALUE (tail)) != code)
2856 /* Definition isn't the kind we were looking for. */
2857 pending_invalid_xref = name;
2858 pending_invalid_xref_file = input_filename;
2859 pending_invalid_xref_line = lineno;
2861 return TREE_VALUE (tail);
2864 if (thislevel_only && ! level->tag_transparent)
2870 /* Print an error message now
2871 for a recent invalid struct, union or enum cross reference.
2872 We don't print them immediately because they are not invalid
2873 when used in the `struct foo;' construct for shadowing. */
2876 pending_xref_error ()
2878 if (pending_invalid_xref != 0)
2879 error_with_file_and_line (pending_invalid_xref_file,
2880 pending_invalid_xref_line,
2881 "`%s' defined as wrong kind of tag",
2882 IDENTIFIER_POINTER (pending_invalid_xref));
2883 pending_invalid_xref = 0;
2886 /* Given a type, find the tag that was defined for it and return the tag name.
2887 Otherwise return 0. */
2890 lookup_tag_reverse (type)
2893 register struct binding_level *level;
2895 for (level = current_binding_level; level; level = level->level_chain)
2898 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2900 if (TREE_VALUE (tail) == type)
2901 return TREE_PURPOSE (tail);
2907 /* Look up NAME in the current binding level and its superiors
2908 in the namespace of variables, functions and typedefs.
2909 Return a ..._DECL node of some kind representing its definition,
2910 or return 0 if it is undefined. */
2918 if (current_binding_level != global_binding_level
2919 && IDENTIFIER_LOCAL_VALUE (name))
2920 val = IDENTIFIER_LOCAL_VALUE (name);
2922 val = IDENTIFIER_GLOBAL_VALUE (name);
2926 /* Similar to `lookup_name' but look only at current binding level. */
2929 lookup_name_current_level (name)
2934 if (current_binding_level == global_binding_level)
2935 return IDENTIFIER_GLOBAL_VALUE (name);
2937 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2940 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2941 if (DECL_NAME (t) == name)
2947 /* Mark ARG for GC. */
2950 mark_binding_level (arg)
2953 struct binding_level *level = *(struct binding_level **) arg;
2955 for (; level != 0; level = level->level_chain)
2957 ggc_mark_tree (level->names);
2958 ggc_mark_tree (level->tags);
2959 ggc_mark_tree (level->shadowed);
2960 ggc_mark_tree (level->blocks);
2961 ggc_mark_tree (level->this_block);
2962 ggc_mark_tree (level->parm_order);
2966 /* Create the predefined scalar types of C,
2967 and some nodes representing standard constants (0, 1, (void *) 0).
2968 Initialize the global binding level.
2969 Make definitions for built-in primitive functions. */
2972 init_decl_processing ()
2974 register tree endlink;
2975 tree ptr_ftype_void, ptr_ftype_ptr;
2976 int wchar_type_size;
2977 tree array_domain_type;
2980 current_function_decl = NULL;
2981 named_labels = NULL;
2982 current_binding_level = NULL_BINDING_LEVEL;
2983 free_binding_level = NULL_BINDING_LEVEL;
2985 /* Make the binding_level structure for global names. */
2987 global_binding_level = current_binding_level;
2989 build_common_tree_nodes (flag_signed_char);
2991 /* Define `int' and `char' first so that dbx will output them first. */
2992 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_INT],
2993 integer_type_node));
2994 pushdecl (build_decl (TYPE_DECL, get_identifier ("char"),
2996 pushdecl (build_decl (TYPE_DECL, get_identifier ("long int"),
2997 long_integer_type_node));
2998 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned int"),
2999 unsigned_type_node));
3000 pushdecl (build_decl (TYPE_DECL, get_identifier ("long unsigned int"),
3001 long_unsigned_type_node));
3002 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long int"),
3003 long_long_integer_type_node));
3004 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long unsigned int"),
3005 long_long_unsigned_type_node));
3006 pushdecl (build_decl (TYPE_DECL, get_identifier ("short int"),
3007 short_integer_type_node));
3008 pushdecl (build_decl (TYPE_DECL, get_identifier ("short unsigned int"),
3009 short_unsigned_type_node));
3010 pushdecl (build_decl (TYPE_DECL, get_identifier ("signed char"),
3011 signed_char_type_node));
3012 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned char"),
3013 unsigned_char_type_node));
3014 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intQI_type_node));
3015 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intHI_type_node));
3016 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intSI_type_node));
3017 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
3018 #if HOST_BITS_PER_WIDE_INT >= 64
3019 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intTI_type_node));
3021 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node));
3022 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intHI_type_node));
3023 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intSI_type_node));
3024 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node));
3025 #if HOST_BITS_PER_WIDE_INT >= 64
3026 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intTI_type_node));
3029 /* `unsigned long' is the standard type for sizeof.
3030 Traditionally, use a signed type.
3031 Note that stddef.h uses `unsigned long',
3032 and this must agree, even if long and int are the same size. */
3033 t = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE)));
3034 signed_size_type_node = signed_type (t);
3035 if (flag_traditional && TREE_UNSIGNED (t))
3036 t = signed_type (t);
3038 c_size_type_node = t;
3041 /* Create the widest literal types. */
3042 widest_integer_literal_type_node
3043 = make_signed_type (HOST_BITS_PER_WIDE_INT * 2);
3044 widest_unsigned_literal_type_node
3045 = make_unsigned_type (HOST_BITS_PER_WIDE_INT * 2);
3046 pushdecl (build_decl (TYPE_DECL, NULL_TREE,
3047 widest_integer_literal_type_node));
3048 pushdecl (build_decl (TYPE_DECL, NULL_TREE,
3049 widest_unsigned_literal_type_node));
3051 build_common_tree_nodes_2 (flag_short_double);
3053 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_FLOAT],
3055 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_DOUBLE],
3057 pushdecl (build_decl (TYPE_DECL, get_identifier ("long double"),
3058 long_double_type_node));
3059 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex int"),
3060 complex_integer_type_node));
3061 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex float"),
3062 complex_float_type_node));
3063 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex double"),
3064 complex_double_type_node));
3065 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex long double"),
3066 complex_long_double_type_node));
3067 pushdecl (build_decl (TYPE_DECL,
3068 ridpointers[(int) RID_VOID], void_type_node));
3070 #ifdef MD_INIT_BUILTINS
3074 wchar_type_node = get_identifier (flag_short_wchar
3075 ? "short unsigned int"
3077 wchar_type_node = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (wchar_type_node));
3078 wchar_type_size = TYPE_PRECISION (wchar_type_node);
3079 signed_wchar_type_node = signed_type (wchar_type_node);
3080 unsigned_wchar_type_node = unsigned_type (wchar_type_node);
3083 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (WINT_TYPE)));
3085 boolean_type_node = integer_type_node;
3086 boolean_true_node = integer_one_node;
3087 boolean_false_node = integer_zero_node;
3089 string_type_node = build_pointer_type (char_type_node);
3090 const_string_type_node
3091 = build_pointer_type (build_type_variant (char_type_node, 1, 0));
3093 /* Make a type to be the domain of a few array types
3094 whose domains don't really matter.
3095 200 is small enough that it always fits in size_t
3096 and large enough that it can hold most function names for the
3097 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
3098 array_domain_type = build_index_type (build_int_2 (200, 0));
3100 /* make a type for arrays of characters.
3101 With luck nothing will ever really depend on the length of this
3103 char_array_type_node = build_array_type (char_type_node, array_domain_type);
3105 /* Likewise for arrays of ints. */
3107 = build_array_type (integer_type_node, array_domain_type);
3109 /* This is for wide string constants. */
3110 wchar_array_type_node
3111 = build_array_type (wchar_type_node, array_domain_type);
3113 void_list_node = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
3115 default_function_type = build_function_type (integer_type_node, NULL_TREE);
3117 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE)));
3118 unsigned_ptrdiff_type_node = unsigned_type (ptrdiff_type_node);
3120 c_common_nodes_and_builtins (0, flag_no_builtin, flag_no_nonansi_builtin);
3122 endlink = void_list_node;
3123 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
3125 = build_function_type (ptr_type_node,
3126 tree_cons (NULL_TREE, ptr_type_node, endlink));
3128 /* Types which are common to the fortran compiler and libf2c. When
3129 changing these, you also need to be concerned with f/com.h. */
3131 if (TYPE_PRECISION (float_type_node)
3132 == TYPE_PRECISION (long_integer_type_node))
3134 g77_integer_type_node = long_integer_type_node;
3135 g77_uinteger_type_node = long_unsigned_type_node;
3137 else if (TYPE_PRECISION (float_type_node)
3138 == TYPE_PRECISION (integer_type_node))
3140 g77_integer_type_node = integer_type_node;
3141 g77_uinteger_type_node = unsigned_type_node;
3144 g77_integer_type_node = g77_uinteger_type_node = NULL_TREE;
3146 if (g77_integer_type_node != NULL_TREE)
3148 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_integer"),
3149 g77_integer_type_node));
3150 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_uinteger"),
3151 g77_uinteger_type_node));
3154 if (TYPE_PRECISION (float_type_node) * 2
3155 == TYPE_PRECISION (long_integer_type_node))
3157 g77_longint_type_node = long_integer_type_node;
3158 g77_ulongint_type_node = long_unsigned_type_node;
3160 else if (TYPE_PRECISION (float_type_node) * 2
3161 == TYPE_PRECISION (long_long_integer_type_node))
3163 g77_longint_type_node = long_long_integer_type_node;
3164 g77_ulongint_type_node = long_long_unsigned_type_node;
3167 g77_longint_type_node = g77_ulongint_type_node = NULL_TREE;
3169 if (g77_longint_type_node != NULL_TREE)
3171 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_longint"),
3172 g77_longint_type_node));
3173 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_ulongint"),
3174 g77_ulongint_type_node));
3177 builtin_function ("__builtin_aggregate_incoming_address",
3178 build_function_type (ptr_type_node, NULL_TREE),
3179 BUILT_IN_AGGREGATE_INCOMING_ADDRESS,
3180 BUILT_IN_NORMAL, NULL_PTR);
3182 /* Hooks for the DWARF 2 __throw routine. */
3183 builtin_function ("__builtin_unwind_init",
3184 build_function_type (void_type_node, endlink),
3185 BUILT_IN_UNWIND_INIT, BUILT_IN_NORMAL, NULL_PTR);
3186 builtin_function ("__builtin_dwarf_cfa", ptr_ftype_void,
3187 BUILT_IN_DWARF_CFA, BUILT_IN_NORMAL, NULL_PTR);
3188 builtin_function ("__builtin_dwarf_fp_regnum",
3189 build_function_type (unsigned_type_node, endlink),
3190 BUILT_IN_DWARF_FP_REGNUM, BUILT_IN_NORMAL, NULL_PTR);
3191 builtin_function ("__builtin_init_dwarf_reg_size_table", void_ftype_ptr,
3192 BUILT_IN_INIT_DWARF_REG_SIZES, BUILT_IN_NORMAL, NULL_PTR);
3193 builtin_function ("__builtin_frob_return_addr", ptr_ftype_ptr,
3194 BUILT_IN_FROB_RETURN_ADDR, BUILT_IN_NORMAL, NULL_PTR);
3195 builtin_function ("__builtin_extract_return_addr", ptr_ftype_ptr,
3196 BUILT_IN_EXTRACT_RETURN_ADDR, BUILT_IN_NORMAL, NULL_PTR);
3198 ("__builtin_eh_return",
3199 build_function_type (void_type_node,
3200 tree_cons (NULL_TREE, ptr_type_node,
3201 tree_cons (NULL_TREE,
3202 type_for_mode (ptr_mode, 0),
3203 tree_cons (NULL_TREE,
3206 BUILT_IN_EH_RETURN, BUILT_IN_NORMAL, NULL_PTR);
3208 pedantic_lvalues = pedantic;
3210 /* Create the global bindings for __FUNCTION__, __PRETTY_FUNCTION__,
3212 function_id_node = get_identifier ("__FUNCTION__");
3213 pretty_function_id_node = get_identifier ("__PRETTY_FUNCTION__");
3214 func_id_node = get_identifier ("__func__");
3215 make_fname_decl = c_make_fname_decl;
3216 declare_function_name ();
3218 start_identifier_warnings ();
3220 /* Prepare to check format strings against argument lists. */
3221 init_function_format_info ();
3223 incomplete_decl_finalize_hook = finish_incomplete_decl;
3225 /* Record our roots. */
3227 ggc_add_tree_root (c_global_trees, CTI_MAX);
3228 ggc_add_root (&c_stmt_tree, 1, sizeof c_stmt_tree, mark_stmt_tree);
3229 ggc_add_tree_root (&c_scope_stmt_stack, 1);
3230 ggc_add_tree_root (&named_labels, 1);
3231 ggc_add_tree_root (&shadowed_labels, 1);
3232 ggc_add_root (¤t_binding_level, 1, sizeof current_binding_level,
3233 mark_binding_level);
3234 ggc_add_root (&label_level_chain, 1, sizeof label_level_chain,
3235 mark_binding_level);
3236 ggc_add_tree_root (&static_ctors, 1);
3237 ggc_add_tree_root (&static_dtors, 1);
3240 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3241 decl, NAME is the initialization string and TYPE_DEP indicates whether
3242 NAME depended on the type of the function. As we don't yet implement
3243 delayed emission of static data, we mark the decl as emitted
3244 so it is not placed in the output. Anything using it must therefore pull
3245 out the STRING_CST initializer directly. This does mean that these names
3246 are string merging candidates, which is wrong for C99's __func__. FIXME. */
3249 c_make_fname_decl (id, name, type_dep)
3252 int type_dep ATTRIBUTE_UNUSED;
3254 tree decl, type, init;
3255 size_t length = strlen (name);
3257 type = build_array_type
3258 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
3259 build_index_type (build_int_2 (length, 0)));
3261 decl = build_decl (VAR_DECL, id, type);
3262 TREE_STATIC (decl) = 1;
3263 TREE_READONLY (decl) = 1;
3264 TREE_ASM_WRITTEN (decl) = 1;
3265 DECL_SOURCE_LINE (decl) = 0;
3266 DECL_ARTIFICIAL (decl) = 1;
3267 DECL_IN_SYSTEM_HEADER (decl) = 1;
3268 DECL_IGNORED_P (decl) = 1;
3269 init = build_string (length + 1, name);
3270 TREE_TYPE (init) = type;
3271 DECL_INITIAL (decl) = init;
3272 finish_decl (pushdecl (decl), init, NULL_TREE);
3277 /* Return a definition for a builtin function named NAME and whose data type
3278 is TYPE. TYPE should be a function type with argument types.
3279 FUNCTION_CODE tells later passes how to compile calls to this function.
3280 See tree.h for its possible values.
3282 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3283 the name to be called if we can't opencode the function. */
3286 builtin_function (name, type, function_code, class, library_name)
3290 enum built_in_class class;
3291 const char *library_name;
3293 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3294 DECL_EXTERNAL (decl) = 1;
3295 TREE_PUBLIC (decl) = 1;
3296 /* If -traditional, permit redefining a builtin function any way you like.
3297 (Though really, if the program redefines these functions,
3298 it probably won't work right unless compiled with -fno-builtin.) */
3299 if (flag_traditional && name[0] != '_')
3300 DECL_BUILT_IN_NONANSI (decl) = 1;
3302 DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
3303 make_decl_rtl (decl, NULL_PTR, 1);
3305 DECL_BUILT_IN_CLASS (decl) = class;
3306 DECL_FUNCTION_CODE (decl) = function_code;
3308 /* Warn if a function in the namespace for users
3309 is used without an occasion to consider it declared. */
3310 if (name[0] != '_' || name[1] != '_')
3311 C_DECL_ANTICIPATED (decl) = 1;
3316 /* Called when a declaration is seen that contains no names to declare.
3317 If its type is a reference to a structure, union or enum inherited
3318 from a containing scope, shadow that tag name for the current scope
3319 with a forward reference.
3320 If its type defines a new named structure or union
3321 or defines an enum, it is valid but we need not do anything here.
3322 Otherwise, it is an error. */
3325 shadow_tag (declspecs)
3328 shadow_tag_warned (declspecs, 0);
3332 shadow_tag_warned (declspecs, warned)
3335 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3342 pending_invalid_xref = 0;
3344 /* Remove the attributes from declspecs, since they will confuse the
3346 split_specs_attrs (declspecs, &specs, &attrs);
3348 for (link = specs; link; link = TREE_CHAIN (link))
3350 register tree value = TREE_VALUE (link);
3351 register enum tree_code code = TREE_CODE (value);
3353 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3354 /* Used to test also that TYPE_SIZE (value) != 0.
3355 That caused warning for `struct foo;' at top level in the file. */
3357 register tree name = lookup_tag_reverse (value);
3364 if (warned != 1 && code != ENUMERAL_TYPE)
3365 /* Empty unnamed enum OK */
3367 pedwarn ("unnamed struct/union that defines no instances");
3373 t = lookup_tag (code, name, current_binding_level, 1);
3377 t = make_node (code);
3384 if (!warned && ! in_system_header)
3386 warning ("useless keyword or type name in empty declaration");
3393 error ("two types specified in one empty declaration");
3398 pedwarn ("empty declaration");
3402 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3405 groktypename (typename)
3408 if (TREE_CODE (typename) != TREE_LIST)
3410 return grokdeclarator (TREE_VALUE (typename),
3411 TREE_PURPOSE (typename),
3415 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3418 groktypename_in_parm_context (typename)
3421 if (TREE_CODE (typename) != TREE_LIST)
3423 return grokdeclarator (TREE_VALUE (typename),
3424 TREE_PURPOSE (typename),
3428 /* Decode a declarator in an ordinary declaration or data definition.
3429 This is called as soon as the type information and variable name
3430 have been parsed, before parsing the initializer if any.
3431 Here we create the ..._DECL node, fill in its type,
3432 and put it on the list of decls for the current context.
3433 The ..._DECL node is returned as the value.
3435 Exception: for arrays where the length is not specified,
3436 the type is left null, to be filled in by `finish_decl'.
3438 Function definitions do not come here; they go to start_function
3439 instead. However, external and forward declarations of functions
3440 do go through here. Structure field declarations are done by
3441 grokfield and not through here. */
3444 start_decl (declarator, declspecs, initialized, attributes, prefix_attributes)
3445 tree declarator, declspecs;
3447 tree attributes, prefix_attributes;
3449 register tree decl = grokdeclarator (declarator, declspecs,
3450 NORMAL, initialized);
3453 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3454 && MAIN_NAME_P (DECL_NAME (decl)))
3455 warning_with_decl (decl, "`%s' is usually a function");
3458 /* Is it valid for this decl to have an initializer at all?
3459 If not, set INITIALIZED to zero, which will indirectly
3460 tell `finish_decl' to ignore the initializer once it is parsed. */
3461 switch (TREE_CODE (decl))
3464 /* typedef foo = bar means give foo the same type as bar.
3465 We haven't parsed bar yet, so `finish_decl' will fix that up.
3466 Any other case of an initialization in a TYPE_DECL is an error. */
3467 if (pedantic || list_length (declspecs) > 1)
3469 error ("typedef `%s' is initialized",
3470 IDENTIFIER_POINTER (DECL_NAME (decl)));
3476 error ("function `%s' is initialized like a variable",
3477 IDENTIFIER_POINTER (DECL_NAME (decl)));
3482 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3483 error ("parameter `%s' is initialized",
3484 IDENTIFIER_POINTER (DECL_NAME (decl)));
3489 /* Don't allow initializations for incomplete types
3490 except for arrays which might be completed by the initialization. */
3491 if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3493 /* A complete type is ok if size is fixed. */
3495 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3496 || C_DECL_VARIABLE_SIZE (decl))
3498 error ("variable-sized object may not be initialized");
3502 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3504 error ("variable `%s' has initializer but incomplete type",
3505 IDENTIFIER_POINTER (DECL_NAME (decl)));
3508 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
3510 error ("elements of array `%s' have incomplete type",
3511 IDENTIFIER_POINTER (DECL_NAME (decl)));
3519 /* Seems redundant with grokdeclarator. */
3520 if (current_binding_level != global_binding_level
3521 && DECL_EXTERNAL (decl)
3522 && TREE_CODE (decl) != FUNCTION_DECL)
3523 warning ("declaration of `%s' has `extern' and is initialized",
3524 IDENTIFIER_POINTER (DECL_NAME (decl)));
3526 DECL_EXTERNAL (decl) = 0;
3527 if (current_binding_level == global_binding_level)
3528 TREE_STATIC (decl) = 1;
3530 /* Tell `pushdecl' this is an initialized decl
3531 even though we don't yet have the initializer expression.
3532 Also tell `finish_decl' it may store the real initializer. */
3533 DECL_INITIAL (decl) = error_mark_node;
3536 /* If this is a function declaration, write a record describing it to the
3537 prototypes file (if requested). */
3539 if (TREE_CODE (decl) == FUNCTION_DECL)
3540 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3542 /* ANSI specifies that a tentative definition which is not merged with
3543 a non-tentative definition behaves exactly like a definition with an
3544 initializer equal to zero. (Section 3.7.2)
3545 -fno-common gives strict ANSI behavior. Usually you don't want it.
3546 This matters only for variables with external linkage. */
3547 if (! flag_no_common || ! TREE_PUBLIC (decl))
3548 DECL_COMMON (decl) = 1;
3550 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
3551 SET_DEFAULT_DECL_ATTRIBUTES (decl, attributes);
3554 /* Set attributes here so if duplicate decl, will have proper attributes. */
3555 decl_attributes (decl, attributes, prefix_attributes);
3557 /* Add this decl to the current binding level.
3558 TEM may equal DECL or it may be a previous decl of the same name. */
3559 tem = pushdecl (decl);
3561 /* For a local variable, define the RTL now. */
3562 if (current_binding_level != global_binding_level
3563 /* But not if this is a duplicate decl
3564 and we preserved the rtl from the previous one
3565 (which may or may not happen). */
3566 && DECL_RTL (tem) == 0
3567 && !DECL_CONTEXT (tem))
3569 if (COMPLETE_TYPE_P (TREE_TYPE (tem)))
3571 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3572 && DECL_INITIAL (tem) != 0)
3579 /* Finish processing of a declaration;
3580 install its initial value.
3581 If the length of an array type is not known before,
3582 it must be determined now, from the initial value, or it is an error. */
3585 finish_decl (decl, init, asmspec_tree)
3589 register tree type = TREE_TYPE (decl);
3590 int was_incomplete = (DECL_SIZE (decl) == 0);
3593 /* If a name was specified, get the string. */
3595 asmspec = TREE_STRING_POINTER (asmspec_tree);
3597 /* If `start_decl' didn't like having an initialization, ignore it now. */
3599 if (init != 0 && DECL_INITIAL (decl) == 0)
3601 /* Don't crash if parm is initialized. */
3602 if (TREE_CODE (decl) == PARM_DECL)
3607 if (TREE_CODE (decl) != TYPE_DECL)
3608 store_init_value (decl, init);
3611 /* typedef foo = bar; store the type of bar as the type of foo. */
3612 TREE_TYPE (decl) = TREE_TYPE (init);
3613 DECL_INITIAL (decl) = init = 0;
3617 /* Deduce size of array from initialization, if not already known */
3619 if (TREE_CODE (type) == ARRAY_TYPE
3620 && TYPE_DOMAIN (type) == 0
3621 && TREE_CODE (decl) != TYPE_DECL)
3624 = (TREE_STATIC (decl)
3625 /* Even if pedantic, an external linkage array
3626 may have incomplete type at first. */
3627 ? pedantic && !TREE_PUBLIC (decl)
3628 : !DECL_EXTERNAL (decl));
3630 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3632 /* Get the completed type made by complete_array_type. */
3633 type = TREE_TYPE (decl);
3636 error_with_decl (decl, "initializer fails to determine size of `%s'");
3638 else if (failure == 2)
3641 error_with_decl (decl, "array size missing in `%s'");
3642 /* If a `static' var's size isn't known,
3643 make it extern as well as static, so it does not get
3645 If it is not `static', then do not mark extern;
3646 finish_incomplete_decl will give it a default size
3647 and it will get allocated. */
3648 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3649 DECL_EXTERNAL (decl) = 1;
3652 /* TYPE_MAX_VALUE is always one less than the number of elements
3653 in the array, because we start counting at zero. Therefore,
3654 warn only if the value is less than zero. */
3655 else if (pedantic && TYPE_DOMAIN (type) != 0
3656 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3657 error_with_decl (decl, "zero or negative size array `%s'");
3659 layout_decl (decl, 0);
3662 if (TREE_CODE (decl) == VAR_DECL)
3664 if (DECL_SIZE (decl) == 0 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3665 layout_decl (decl, 0);
3667 if (DECL_SIZE (decl) == 0
3668 && (TREE_STATIC (decl)
3670 /* A static variable with an incomplete type
3671 is an error if it is initialized.
3672 Also if it is not file scope.
3673 Otherwise, let it through, but if it is not `extern'
3674 then it may cause an error message later. */
3675 (DECL_INITIAL (decl) != 0
3676 || DECL_CONTEXT (decl) != 0)
3678 /* An automatic variable with an incomplete type
3680 !DECL_EXTERNAL (decl)))
3682 error_with_decl (decl, "storage size of `%s' isn't known");
3683 TREE_TYPE (decl) = error_mark_node;
3686 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3687 && DECL_SIZE (decl) != 0)
3689 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3690 constant_expression_warning (DECL_SIZE (decl));
3692 error_with_decl (decl, "storage size of `%s' isn't constant");
3695 if (TREE_USED (type))
3696 TREE_USED (decl) = 1;
3699 /* If this is a function and an assembler name is specified, it isn't
3700 builtin any more. Also reset DECL_RTL so we can give it its new
3702 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3704 DECL_BUILT_IN_CLASS (decl) = NOT_BUILT_IN;
3705 DECL_RTL (decl) = 0;
3706 DECL_ASSEMBLER_NAME (decl) = get_identifier (asmspec);
3709 /* Output the assembler code and/or RTL code for variables and functions,
3710 unless the type is an undefined structure or union.
3711 If not, it will get done when the type is completed. */
3713 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3715 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3716 maybe_objc_check_decl (decl);
3718 if (!DECL_CONTEXT (decl))
3719 rest_of_decl_compilation (decl, asmspec,
3720 (DECL_CONTEXT (decl) == 0
3721 || TREE_ASM_WRITTEN (decl)), 0);
3725 DECL_ASSEMBLER_NAME (decl) = get_identifier (asmspec);
3726 add_decl_stmt (decl);
3729 if (DECL_CONTEXT (decl) != 0)
3731 /* Recompute the RTL of a local array now
3732 if it used to be an incomplete type. */
3734 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3736 /* If we used it already as memory, it must stay in memory. */
3737 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3738 /* If it's still incomplete now, no init will save it. */
3739 if (DECL_SIZE (decl) == 0)
3740 DECL_INITIAL (decl) = 0;
3745 if (TREE_CODE (decl) == TYPE_DECL)
3747 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3748 maybe_objc_check_decl (decl);
3749 rest_of_decl_compilation (decl, NULL_PTR, DECL_CONTEXT (decl) == 0, 0);
3752 /* At the end of a declaration, throw away any variable type sizes
3753 of types defined inside that declaration. There is no use
3754 computing them in the following function definition. */
3755 if (current_binding_level == global_binding_level)
3756 get_pending_sizes ();
3759 /* If DECL has a cleanup, build and return that cleanup here.
3760 This is a callback called by expand_expr. */
3763 maybe_build_cleanup (decl)
3764 tree decl ATTRIBUTE_UNUSED;
3766 /* There are no cleanups in C. */
3770 /* Given a parsed parameter declaration,
3771 decode it into a PARM_DECL and push that on the current binding level.
3772 Also, for the sake of forward parm decls,
3773 record the given order of parms in `parm_order'. */
3776 push_parm_decl (parm)
3780 int old_immediate_size_expand = immediate_size_expand;
3781 /* Don't try computing parm sizes now -- wait till fn is called. */
3782 immediate_size_expand = 0;
3784 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3785 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3786 decl_attributes (decl, TREE_VALUE (TREE_VALUE (parm)),
3787 TREE_PURPOSE (TREE_VALUE (parm)));
3790 if (DECL_NAME (decl))
3793 olddecl = lookup_name (DECL_NAME (decl));
3794 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3795 pedwarn_with_decl (decl,
3796 "ANSI C forbids parameter `%s' shadowing typedef");
3800 decl = pushdecl (decl);
3802 immediate_size_expand = old_immediate_size_expand;
3804 current_binding_level->parm_order
3805 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3807 /* Add this decl to the current binding level. */
3808 finish_decl (decl, NULL_TREE, NULL_TREE);
3811 /* Clear the given order of parms in `parm_order'.
3812 Used at start of parm list,
3813 and also at semicolon terminating forward decls. */
3818 current_binding_level->parm_order = NULL_TREE;
3821 /* Make TYPE a complete type based on INITIAL_VALUE.
3822 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3823 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3826 complete_array_type (type, initial_value, do_default)
3831 register tree maxindex = NULL_TREE;
3836 /* Note MAXINDEX is really the maximum index,
3837 one less than the size. */
3838 if (TREE_CODE (initial_value) == STRING_CST)
3841 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3842 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3845 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3847 tree elts = CONSTRUCTOR_ELTS (initial_value);
3848 maxindex = build_int_2 (-1, -1);
3849 for (; elts; elts = TREE_CHAIN (elts))
3851 if (TREE_PURPOSE (elts))
3852 maxindex = TREE_PURPOSE (elts);
3854 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3855 maxindex, integer_one_node));
3857 maxindex = copy_node (maxindex);
3861 /* Make an error message unless that happened already. */
3862 if (initial_value != error_mark_node)
3865 /* Prevent further error messages. */
3866 maxindex = build_int_2 (0, 0);
3873 maxindex = build_int_2 (0, 0);
3879 TYPE_DOMAIN (type) = build_index_type (maxindex);
3880 if (!TREE_TYPE (maxindex))
3881 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3884 /* Lay out the type now that we can get the real answer. */
3891 /* Given declspecs and a declarator,
3892 determine the name and type of the object declared
3893 and construct a ..._DECL node for it.
3894 (In one case we can return a ..._TYPE node instead.
3895 For invalid input we sometimes return 0.)
3897 DECLSPECS is a chain of tree_list nodes whose value fields
3898 are the storage classes and type specifiers.
3900 DECL_CONTEXT says which syntactic context this declaration is in:
3901 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3902 FUNCDEF for a function definition. Like NORMAL but a few different
3903 error messages in each case. Return value may be zero meaning
3904 this definition is too screwy to try to parse.
3905 PARM for a parameter declaration (either within a function prototype
3906 or before a function body). Make a PARM_DECL, or return void_type_node.
3907 TYPENAME if for a typename (in a cast or sizeof).
3908 Don't make a DECL node; just return the ..._TYPE node.
3909 FIELD for a struct or union field; make a FIELD_DECL.
3910 BITFIELD for a field with specified width.
3911 INITIALIZED is 1 if the decl has an initializer.
3913 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3914 It may also be so in the PARM case, for a prototype where the
3915 argument type is specified but not the name.
3917 This function is where the complicated C meanings of `static'
3918 and `extern' are interpreted. */
3921 grokdeclarator (declarator, declspecs, decl_context, initialized)
3924 enum decl_context decl_context;
3929 tree type = NULL_TREE;
3934 int type_quals = TYPE_UNQUALIFIED;
3936 int explicit_int = 0;
3937 int explicit_char = 0;
3938 int defaulted_int = 0;
3939 tree typedef_decl = 0;
3941 tree typedef_type = 0;
3942 int funcdef_flag = 0;
3943 enum tree_code innermost_code = ERROR_MARK;
3945 int size_varies = 0;
3946 tree decl_machine_attr = NULL_TREE;
3948 if (decl_context == BITFIELD)
3949 bitfield = 1, decl_context = FIELD;
3951 if (decl_context == FUNCDEF)
3952 funcdef_flag = 1, decl_context = NORMAL;
3954 /* Look inside a declarator for the name being declared
3955 and get it as a string, for an error message. */
3957 register tree decl = declarator;
3961 switch (TREE_CODE (decl))
3966 innermost_code = TREE_CODE (decl);
3967 decl = TREE_OPERAND (decl, 0);
3970 case IDENTIFIER_NODE:
3971 name = IDENTIFIER_POINTER (decl);
3982 /* A function definition's declarator must have the form of
3983 a function declarator. */
3985 if (funcdef_flag && innermost_code != CALL_EXPR)
3988 /* Anything declared one level down from the top level
3989 must be one of the parameters of a function
3990 (because the body is at least two levels down). */
3992 /* If this looks like a function definition, make it one,
3993 even if it occurs where parms are expected.
3994 Then store_parm_decls will reject it and not use it as a parm. */
3995 if (decl_context == NORMAL && !funcdef_flag
3996 && current_binding_level->parm_flag)
3997 decl_context = PARM;
3999 /* Look through the decl specs and record which ones appear.
4000 Some typespecs are defined as built-in typenames.
4001 Others, the ones that are modifiers of other types,
4002 are represented by bits in SPECBITS: set the bits for
4003 the modifiers that appear. Storage class keywords are also in SPECBITS.
4005 If there is a typedef name or a type, store the type in TYPE.
4006 This includes builtin typedefs such as `int'.
4008 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
4009 and did not come from a user typedef.
4011 Set LONGLONG if `long' is mentioned twice. */
4013 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
4015 register tree id = TREE_VALUE (spec);
4017 if (id == ridpointers[(int) RID_INT])
4019 if (id == ridpointers[(int) RID_CHAR])
4022 if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
4024 enum rid i = C_RID_CODE (id);
4025 if (i <= RID_LAST_MODIFIER)
4027 if (i == RID_LONG && specbits & (1<<i))
4030 error ("`long long long' is too long for GCC");
4033 if (pedantic && !flag_isoc99 && ! in_system_header
4035 pedwarn ("ISO C89 does not support `long long'");
4039 else if (specbits & (1 << i))
4040 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
4046 error ("two or more data types in declaration of `%s'", name);
4047 /* Actual typedefs come to us as TYPE_DECL nodes. */
4048 else if (TREE_CODE (id) == TYPE_DECL)
4050 type = TREE_TYPE (id);
4051 decl_machine_attr = DECL_MACHINE_ATTRIBUTES (id);
4054 /* Built-in types come as identifiers. */
4055 else if (TREE_CODE (id) == IDENTIFIER_NODE)
4057 register tree t = lookup_name (id);
4058 if (TREE_TYPE (t) == error_mark_node)
4060 else if (!t || TREE_CODE (t) != TYPE_DECL)
4061 error ("`%s' fails to be a typedef or built in type",
4062 IDENTIFIER_POINTER (id));
4065 type = TREE_TYPE (t);
4069 else if (TREE_CODE (id) != ERROR_MARK)
4076 typedef_type = type;
4078 size_varies = C_TYPE_VARIABLE_SIZE (type);
4080 /* No type at all: default to `int', and set DEFAULTED_INT
4081 because it was not a user-defined typedef. */
4085 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4086 | (1 << (int) RID_SIGNED)
4087 | (1 << (int) RID_UNSIGNED)
4088 | (1 << (int) RID_COMPLEX))))
4089 /* Don't warn about typedef foo = bar. */
4090 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
4091 && ! in_system_header)
4093 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
4094 and this is a function, or if -Wimplicit; prefer the former
4095 warning since it is more explicit. */
4096 if ((warn_implicit_int || warn_return_type) && funcdef_flag)
4097 warn_about_return_type = 1;
4098 else if (warn_implicit_int || flag_isoc99)
4099 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
4104 type = integer_type_node;
4107 /* Now process the modifiers that were specified
4108 and check for invalid combinations. */
4110 /* Long double is a special combination. */
4112 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4113 && TYPE_MAIN_VARIANT (type) == double_type_node)
4115 specbits &= ~(1 << (int) RID_LONG);
4116 type = long_double_type_node;
4119 /* Check all other uses of type modifiers. */
4121 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4122 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4126 if ((specbits & 1 << (int) RID_LONG)
4127 && (specbits & 1 << (int) RID_SHORT))
4128 error ("both long and short specified for `%s'", name);
4129 else if (((specbits & 1 << (int) RID_LONG)
4130 || (specbits & 1 << (int) RID_SHORT))
4132 error ("long or short specified with char for `%s'", name);
4133 else if (((specbits & 1 << (int) RID_LONG)
4134 || (specbits & 1 << (int) RID_SHORT))
4135 && TREE_CODE (type) == REAL_TYPE)
4137 static int already = 0;
4139 error ("long or short specified with floating type for `%s'", name);
4140 if (! already && ! pedantic)
4142 error ("the only valid combination is `long double'");
4146 else if ((specbits & 1 << (int) RID_SIGNED)
4147 && (specbits & 1 << (int) RID_UNSIGNED))
4148 error ("both signed and unsigned specified for `%s'", name);
4149 else if (TREE_CODE (type) != INTEGER_TYPE)
4150 error ("long, short, signed or unsigned invalid for `%s'", name);
4154 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4156 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4158 if (flag_pedantic_errors)
4163 /* Discard the type modifiers if they are invalid. */
4166 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4167 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4172 if ((specbits & (1 << (int) RID_COMPLEX))
4173 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4175 error ("complex invalid for `%s'", name);
4176 specbits &= ~(1 << (int) RID_COMPLEX);
4179 /* Decide whether an integer type is signed or not.
4180 Optionally treat bitfields as signed by default. */
4181 if (specbits & 1 << (int) RID_UNSIGNED
4182 /* Traditionally, all bitfields are unsigned. */
4183 || (bitfield && flag_traditional
4184 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4185 || (bitfield && ! flag_signed_bitfields
4186 && (explicit_int || defaulted_int || explicit_char
4187 /* A typedef for plain `int' without `signed'
4188 can be controlled just like plain `int'. */
4189 || ! (typedef_decl != 0
4190 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4191 && TREE_CODE (type) != ENUMERAL_TYPE
4192 && !(specbits & 1 << (int) RID_SIGNED)))
4195 type = long_long_unsigned_type_node;
4196 else if (specbits & 1 << (int) RID_LONG)
4197 type = long_unsigned_type_node;
4198 else if (specbits & 1 << (int) RID_SHORT)
4199 type = short_unsigned_type_node;
4200 else if (type == char_type_node)
4201 type = unsigned_char_type_node;
4202 else if (typedef_decl)
4203 type = unsigned_type (type);
4205 type = unsigned_type_node;
4207 else if ((specbits & 1 << (int) RID_SIGNED)
4208 && type == char_type_node)
4209 type = signed_char_type_node;
4211 type = long_long_integer_type_node;
4212 else if (specbits & 1 << (int) RID_LONG)
4213 type = long_integer_type_node;
4214 else if (specbits & 1 << (int) RID_SHORT)
4215 type = short_integer_type_node;
4217 if (specbits & 1 << (int) RID_COMPLEX)
4219 if (pedantic && !flag_isoc99)
4220 pedwarn ("ISO C89 does not support complex types");
4221 /* If we just have "complex", it is equivalent to
4222 "complex double", but if any modifiers at all are specified it is
4223 the complex form of TYPE. E.g, "complex short" is
4224 "complex short int". */
4226 if (defaulted_int && ! longlong
4227 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4228 | (1 << (int) RID_SIGNED)
4229 | (1 << (int) RID_UNSIGNED))))
4232 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
4233 type = complex_double_type_node;
4235 else if (type == integer_type_node)
4238 pedwarn ("ISO C does not support complex integer types");
4239 type = complex_integer_type_node;
4241 else if (type == float_type_node)
4242 type = complex_float_type_node;
4243 else if (type == double_type_node)
4244 type = complex_double_type_node;
4245 else if (type == long_double_type_node)
4246 type = complex_long_double_type_node;
4250 pedwarn ("ISO C does not support complex integer types");
4251 type = build_complex_type (type);
4255 /* Figure out the type qualifiers for the declaration. There are
4256 two ways a declaration can become qualified. One is something
4257 like `const int i' where the `const' is explicit. Another is
4258 something like `typedef const int CI; CI i' where the type of the
4259 declaration contains the `const'. */
4260 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4261 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
4262 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4263 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4264 if (constp > 1 && ! flag_isoc99)
4265 pedwarn ("duplicate `const'");
4266 if (restrictp > 1 && ! flag_isoc99)
4267 pedwarn ("duplicate `restrict'");
4268 if (volatilep > 1 && ! flag_isoc99)
4269 pedwarn ("duplicate `volatile'");
4270 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
4271 type = TYPE_MAIN_VARIANT (type);
4272 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4273 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4274 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4276 /* Warn if two storage classes are given. Default to `auto'. */
4281 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4282 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4283 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4284 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4285 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4287 /* Warn about storage classes that are invalid for certain
4288 kinds of declarations (parameters, typenames, etc.). */
4291 error ("multiple storage classes in declaration of `%s'", name);
4292 else if (funcdef_flag
4294 & ((1 << (int) RID_REGISTER)
4295 | (1 << (int) RID_AUTO)
4296 | (1 << (int) RID_TYPEDEF))))
4298 if (specbits & 1 << (int) RID_AUTO
4299 && (pedantic || current_binding_level == global_binding_level))
4300 pedwarn ("function definition declared `auto'");
4301 if (specbits & 1 << (int) RID_REGISTER)
4302 error ("function definition declared `register'");
4303 if (specbits & 1 << (int) RID_TYPEDEF)
4304 error ("function definition declared `typedef'");
4305 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4306 | (1 << (int) RID_AUTO));
4308 else if (decl_context != NORMAL && nclasses > 0)
4310 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4314 switch (decl_context)
4317 error ("storage class specified for structure field `%s'",
4321 error ("storage class specified for parameter `%s'", name);
4324 error ("storage class specified for typename");
4327 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4328 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4329 | (1 << (int) RID_EXTERN));
4332 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4334 /* `extern' with initialization is invalid if not at top level. */
4335 if (current_binding_level == global_binding_level)
4336 warning ("`%s' initialized and declared `extern'", name);
4338 error ("`%s' has both `extern' and initializer", name);
4340 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4341 && current_binding_level != global_binding_level)
4342 error ("nested function `%s' declared `extern'", name);
4343 else if (current_binding_level == global_binding_level
4344 && specbits & (1 << (int) RID_AUTO))
4345 error ("top-level declaration of `%s' specifies `auto'", name);
4348 /* Now figure out the structure of the declarator proper.
4349 Descend through it, creating more complex types, until we reach
4350 the declared identifier (or NULL_TREE, in an absolute declarator). */
4352 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4354 if (type == error_mark_node)
4356 declarator = TREE_OPERAND (declarator, 0);
4360 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4361 an INDIRECT_REF (for *...),
4362 a CALL_EXPR (for ...(...)),
4363 an identifier (for the name being declared)
4364 or a null pointer (for the place in an absolute declarator
4365 where the name was omitted).
4366 For the last two cases, we have just exited the loop.
4368 At this point, TYPE is the type of elements of an array,
4369 or for a function to return, or for a pointer to point to.
4370 After this sequence of ifs, TYPE is the type of the
4371 array or function or pointer, and DECLARATOR has had its
4372 outermost layer removed. */
4374 if (TREE_CODE (declarator) == ARRAY_REF)
4376 register tree itype = NULL_TREE;
4377 register tree size = TREE_OPERAND (declarator, 1);
4378 /* The index is a signed object `sizetype' bits wide. */
4379 tree index_type = signed_type (sizetype);
4381 declarator = TREE_OPERAND (declarator, 0);
4383 /* Check for some types that there cannot be arrays of. */
4385 if (VOID_TYPE_P (type))
4387 error ("declaration of `%s' as array of voids", name);
4388 type = error_mark_node;
4391 if (TREE_CODE (type) == FUNCTION_TYPE)
4393 error ("declaration of `%s' as array of functions", name);
4394 type = error_mark_node;
4397 if (size == error_mark_node)
4398 type = error_mark_node;
4400 if (type == error_mark_node)
4403 /* If size was specified, set ITYPE to a range-type for that size.
4404 Otherwise, ITYPE remains null. finish_decl may figure it out
4405 from an initial value. */
4409 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4410 STRIP_TYPE_NOPS (size);
4412 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
4413 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
4415 error ("size of array `%s' has non-integer type", name);
4416 size = integer_one_node;
4419 if (pedantic && integer_zerop (size))
4420 pedwarn ("ISO C forbids zero-size array `%s'", name);
4422 if (TREE_CODE (size) == INTEGER_CST)
4424 constant_expression_warning (size);
4425 if (tree_int_cst_sgn (size) < 0)
4427 error ("size of array `%s' is negative", name);
4428 size = integer_one_node;
4433 /* Make sure the array size remains visibly nonconstant
4434 even if it is (eg) a const variable with known value. */
4439 if (TREE_CONSTANT (size))
4440 pedwarn ("ISO C89 forbids array `%s' whose size can't be evaluated",
4443 pedwarn ("ISO C89 forbids variable-size array `%s'",
4448 /* Convert size to index_type, so that if it is a variable
4449 the computations will be done in the proper mode. */
4450 itype = fold (build (MINUS_EXPR, index_type,
4451 convert (index_type, size),
4452 convert (index_type, size_one_node)));
4454 /* If that overflowed, the array is too big.
4455 ??? While a size of INT_MAX+1 technically shouldn't cause
4456 an overflow (because we subtract 1), the overflow is recorded
4457 during the conversion to index_type, before the subtraction.
4458 Handling this case seems like an unnecessary complication. */
4459 if (TREE_OVERFLOW (itype))
4461 error ("size of array `%s' is too large", name);
4462 type = error_mark_node;
4467 itype = variable_size (itype);
4468 itype = build_index_type (itype);
4472 /* This had bad results for pointers to arrays, as in
4473 union incomplete (*foo)[4]; */
4474 /* Complain about arrays of incomplete types, except in typedefs. */
4476 if (!COMPLETE_TYPE_P (type)
4477 /* Avoid multiple warnings for nested array types. */
4478 && TREE_CODE (type) != ARRAY_TYPE
4479 && !(specbits & (1 << (int) RID_TYPEDEF))
4480 && !C_TYPE_BEING_DEFINED (type))
4481 warning ("array type has incomplete element type");
4485 /* We shouldn't have a function type here at all!
4486 Functions aren't allowed as array elements. */
4487 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4488 && (constp || volatilep))
4489 pedwarn ("ANSI C forbids const or volatile function types");
4492 /* Build the array type itself, then merge any constancy or
4493 volatility into the target type. We must do it in this order
4494 to ensure that the TYPE_MAIN_VARIANT field of the array type
4495 is set correctly. */
4497 type = build_array_type (type, itype);
4499 type = c_build_qualified_type (type, type_quals);
4502 /* Don't clear these; leave them set so that the array type
4503 or the variable is itself const or volatile. */
4504 type_quals = TYPE_UNQUALIFIED;
4508 C_TYPE_VARIABLE_SIZE (type) = 1;
4510 else if (TREE_CODE (declarator) == CALL_EXPR)
4514 /* Declaring a function type.
4515 Make sure we have a valid type for the function to return. */
4516 if (type == error_mark_node)
4521 /* Warn about some types functions can't return. */
4523 if (TREE_CODE (type) == FUNCTION_TYPE)
4525 error ("`%s' declared as function returning a function", name);
4526 type = integer_type_node;
4528 if (TREE_CODE (type) == ARRAY_TYPE)
4530 error ("`%s' declared as function returning an array", name);
4531 type = integer_type_node;
4534 #ifndef TRADITIONAL_RETURN_FLOAT
4535 /* Traditionally, declaring return type float means double. */
4537 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4538 type = double_type_node;
4539 #endif /* TRADITIONAL_RETURN_FLOAT */
4541 /* Construct the function type and go to the next
4542 inner layer of declarator. */
4544 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4546 /* Say it's a definition
4547 only for the CALL_EXPR
4548 closest to the identifier. */
4549 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4550 /* Type qualifiers before the return type of the function
4551 qualify the return type, not the function type. */
4553 type = c_build_qualified_type (type, type_quals);
4554 type_quals = TYPE_UNQUALIFIED;
4556 type = build_function_type (type, arg_types);
4557 declarator = TREE_OPERAND (declarator, 0);
4559 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4560 the formal parameter list of this FUNCTION_TYPE to point to
4561 the FUNCTION_TYPE node itself. */
4566 for (link = last_function_parm_tags;
4568 link = TREE_CHAIN (link))
4569 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4572 else if (TREE_CODE (declarator) == INDIRECT_REF)
4574 /* Merge any constancy or volatility into the target type
4577 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4579 pedwarn ("ISO C forbids qualified function types");
4581 type = c_build_qualified_type (type, type_quals);
4582 type_quals = TYPE_UNQUALIFIED;
4585 type = build_pointer_type (type);
4587 /* Process a list of type modifier keywords
4588 (such as const or volatile) that were given inside the `*'. */
4590 if (TREE_TYPE (declarator))
4592 register tree typemodlist;
4598 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4599 typemodlist = TREE_CHAIN (typemodlist))
4601 tree qualifier = TREE_VALUE (typemodlist);
4603 if (C_IS_RESERVED_WORD (qualifier))
4605 if (C_RID_CODE (qualifier) == RID_CONST)
4607 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4609 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4619 error ("invalid type modifier within pointer declarator");
4620 if (constp > 1 && ! flag_isoc99)
4621 pedwarn ("duplicate `const'");
4622 if (volatilep > 1 && ! flag_isoc99)
4623 pedwarn ("duplicate `volatile'");
4624 if (restrictp > 1 && ! flag_isoc99)
4625 pedwarn ("duplicate `restrict'");
4627 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4628 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4629 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4632 declarator = TREE_OPERAND (declarator, 0);
4639 /* Now TYPE has the actual type. */
4641 /* Did array size calculations overflow? */
4643 if (TREE_CODE (type) == ARRAY_TYPE
4644 && COMPLETE_TYPE_P (type)
4645 && TREE_OVERFLOW (TYPE_SIZE (type)))
4646 error ("size of array `%s' is too large", name);
4648 /* If this is declaring a typedef name, return a TYPE_DECL. */
4650 if (specbits & (1 << (int) RID_TYPEDEF))
4653 /* Note that the grammar rejects storage classes
4654 in typenames, fields or parameters */
4655 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4657 pedwarn ("ISO C forbids qualified function types");
4659 type = c_build_qualified_type (type, type_quals);
4660 decl = build_decl (TYPE_DECL, declarator, type);
4661 if ((specbits & (1 << (int) RID_SIGNED))
4662 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4663 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4667 /* Detect the case of an array type of unspecified size
4668 which came, as such, direct from a typedef name.
4669 We must copy the type, so that each identifier gets
4670 a distinct type, so that each identifier's size can be
4671 controlled separately by its own initializer. */
4673 if (type != 0 && typedef_type != 0
4674 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4675 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4677 type = build_array_type (TREE_TYPE (type), 0);
4679 C_TYPE_VARIABLE_SIZE (type) = 1;
4682 /* If this is a type name (such as, in a cast or sizeof),
4683 compute the type and return it now. */
4685 if (decl_context == TYPENAME)
4687 /* Note that the grammar rejects storage classes
4688 in typenames, fields or parameters */
4689 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4691 pedwarn ("ISO C forbids const or volatile function types");
4693 type = c_build_qualified_type (type, type_quals);
4697 /* Aside from typedefs and type names (handle above),
4698 `void' at top level (not within pointer)
4699 is allowed only in public variables.
4700 We don't complain about parms either, but that is because
4701 a better error message can be made later. */
4703 if (VOID_TYPE_P (type) && decl_context != PARM
4704 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4705 && ((specbits & (1 << (int) RID_EXTERN))
4706 || (current_binding_level == global_binding_level
4708 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4710 error ("variable or field `%s' declared void", name);
4711 type = integer_type_node;
4714 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4715 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4720 if (decl_context == PARM)
4722 tree type_as_written = type;
4725 /* A parameter declared as an array of T is really a pointer to T.
4726 One declared as a function is really a pointer to a function. */
4728 if (TREE_CODE (type) == ARRAY_TYPE)
4730 /* Transfer const-ness of array into that of type pointed to. */
4731 type = TREE_TYPE (type);
4733 type = c_build_qualified_type (type, type_quals);
4734 type = build_pointer_type (type);
4735 type_quals = TYPE_UNQUALIFIED;
4738 else if (TREE_CODE (type) == FUNCTION_TYPE)
4740 if (pedantic && type_quals)
4741 pedwarn ("ISO C forbids qualified function types");
4743 type = c_build_qualified_type (type, type_quals);
4744 type = build_pointer_type (type);
4745 type_quals = TYPE_UNQUALIFIED;
4748 decl = build_decl (PARM_DECL, declarator, type);
4750 C_DECL_VARIABLE_SIZE (decl) = 1;
4752 /* Compute the type actually passed in the parmlist,
4753 for the case where there is no prototype.
4754 (For example, shorts and chars are passed as ints.)
4755 When there is a prototype, this is overridden later. */
4757 if (type == error_mark_node)
4758 promoted_type = type;
4761 promoted_type = simple_type_promotes_to (type);
4762 if (! promoted_type)
4763 promoted_type = type;
4766 DECL_ARG_TYPE (decl) = promoted_type;
4767 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4769 else if (decl_context == FIELD)
4771 /* Structure field. It may not be a function. */
4773 if (TREE_CODE (type) == FUNCTION_TYPE)
4775 error ("field `%s' declared as a function", name);
4776 type = build_pointer_type (type);
4778 else if (TREE_CODE (type) != ERROR_MARK
4779 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4781 error ("field `%s' has incomplete type", name);
4782 type = error_mark_node;
4784 /* Move type qualifiers down to element of an array. */
4785 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4787 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4789 TYPE_DOMAIN (type));
4791 /* Leave the field const or volatile as well. */
4792 type_quals = TYPE_UNQUALIFIED;
4795 decl = build_decl (FIELD_DECL, declarator, type);
4796 DECL_NONADDRESSABLE_P (decl) = bitfield;
4799 C_DECL_VARIABLE_SIZE (decl) = 1;
4801 else if (TREE_CODE (type) == FUNCTION_TYPE)
4803 /* Every function declaration is "external"
4804 except for those which are inside a function body
4805 in which `auto' is used.
4806 That is a case not specified by ANSI C,
4807 and we use it for forward declarations for nested functions. */
4808 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4809 || current_binding_level == global_binding_level);
4811 if (specbits & (1 << (int) RID_AUTO)
4812 && (pedantic || current_binding_level == global_binding_level))
4813 pedwarn ("invalid storage class for function `%s'", name);
4814 if (specbits & (1 << (int) RID_REGISTER))
4815 error ("invalid storage class for function `%s'", name);
4816 /* Function declaration not at top level.
4817 Storage classes other than `extern' are not allowed
4818 and `extern' makes no difference. */
4819 if (current_binding_level != global_binding_level
4820 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4822 pedwarn ("invalid storage class for function `%s'", name);
4824 decl = build_decl (FUNCTION_DECL, declarator, type);
4825 decl = build_decl_attribute_variant (decl, decl_machine_attr);
4827 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4828 pedwarn ("ISO C forbids qualified function types");
4831 && VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl)))
4832 && TYPE_QUALS (TREE_TYPE (TREE_TYPE (decl)))
4833 && ! DECL_IN_SYSTEM_HEADER (decl))
4834 pedwarn ("ISO C forbids qualified void function return type");
4836 /* GNU C interprets a `volatile void' return type to indicate
4837 that the function does not return. */
4838 if ((type_quals & TYPE_QUAL_VOLATILE)
4839 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4840 warning ("`noreturn' function returns non-void value");
4843 DECL_EXTERNAL (decl) = 1;
4844 /* Record absence of global scope for `static' or `auto'. */
4846 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4848 /* Record presence of `inline', if it is reasonable. */
4851 if (MAIN_NAME_P (declarator))
4852 warning ("cannot inline function `main'");
4854 /* Assume that otherwise the function can be inlined. */
4855 DECL_INLINE (decl) = 1;
4857 if (specbits & (1 << (int) RID_EXTERN))
4858 current_extern_inline = 1;
4863 /* It's a variable. */
4864 /* An uninitialized decl with `extern' is a reference. */
4865 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4867 /* Move type qualifiers down to element of an array. */
4868 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4870 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4872 TYPE_DOMAIN (type));
4873 #if 0 /* Leave the variable const or volatile as well. */
4874 type_quals = TYPE_UNQUALIFIED;
4878 decl = build_decl (VAR_DECL, declarator, type);
4880 C_DECL_VARIABLE_SIZE (decl) = 1;
4883 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4885 DECL_EXTERNAL (decl) = extern_ref;
4886 /* At top level, the presence of a `static' or `register' storage
4887 class specifier, or the absence of all storage class specifiers
4888 makes this declaration a definition (perhaps tentative). Also,
4889 the absence of both `static' and `register' makes it public. */
4890 if (current_binding_level == global_binding_level)
4894 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
4895 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
4897 /* Not at top level, only `static' makes a static definition. */
4900 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4901 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
4905 /* Record `register' declaration for warnings on &
4906 and in case doing stupid register allocation. */
4908 if (specbits & (1 << (int) RID_REGISTER))
4909 DECL_REGISTER (decl) = 1;
4911 /* Record constancy and volatility. */
4912 c_apply_type_quals_to_decl (type_quals, decl);
4914 /* If a type has volatile components, it should be stored in memory.
4915 Otherwise, the fact that those components are volatile
4916 will be ignored, and would even crash the compiler. */
4917 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4918 mark_addressable (decl);
4924 /* Decode the parameter-list info for a function type or function definition.
4925 The argument is the value returned by `get_parm_info' (or made in parse.y
4926 if there is an identifier list instead of a parameter decl list).
4927 These two functions are separate because when a function returns
4928 or receives functions then each is called multiple times but the order
4929 of calls is different. The last call to `grokparms' is always the one
4930 that contains the formal parameter names of a function definition.
4932 Store in `last_function_parms' a chain of the decls of parms.
4933 Also store in `last_function_parm_tags' a chain of the struct, union,
4934 and enum tags declared among the parms.
4936 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4938 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4939 a mere declaration. A nonempty identifier-list gets an error message
4940 when FUNCDEF_FLAG is zero. */
4943 grokparms (parms_info, funcdef_flag)
4947 tree first_parm = TREE_CHAIN (parms_info);
4949 last_function_parms = TREE_PURPOSE (parms_info);
4950 last_function_parm_tags = TREE_VALUE (parms_info);
4952 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
4953 && !in_system_header)
4954 warning ("function declaration isn't a prototype");
4957 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
4960 pedwarn ("parameter names (without types) in function declaration");
4962 last_function_parms = first_parm;
4969 /* We no longer test FUNCDEF_FLAG.
4970 If the arg types are incomplete in a declaration,
4971 they must include undefined tags.
4972 These tags can never be defined in the scope of the declaration,
4973 so the types can never be completed,
4974 and no call can be compiled successfully. */
4976 /* In a fcn definition, arg types must be complete. */
4979 for (parm = last_function_parms, typelt = first_parm;
4981 parm = TREE_CHAIN (parm))
4982 /* Skip over any enumeration constants declared here. */
4983 if (TREE_CODE (parm) == PARM_DECL)
4985 /* Barf if the parameter itself has an incomplete type. */
4986 tree type = TREE_VALUE (typelt);
4987 if (!COMPLETE_TYPE_P (type))
4989 if (funcdef_flag && DECL_NAME (parm) != 0)
4990 error ("parameter `%s' has incomplete type",
4991 IDENTIFIER_POINTER (DECL_NAME (parm)));
4993 warning ("parameter has incomplete type");
4996 TREE_VALUE (typelt) = error_mark_node;
4997 TREE_TYPE (parm) = error_mark_node;
5001 /* This has been replaced by parm_tags_warning, which
5002 uses a more accurate criterion for what to warn
5006 /* Now warn if is a pointer to an incomplete type. */
5007 while (TREE_CODE (type) == POINTER_TYPE
5008 || TREE_CODE (type) == REFERENCE_TYPE)
5009 type = TREE_TYPE (type);
5010 type = TYPE_MAIN_VARIANT (type);
5011 if (!COMPLETE_TYPE_P (type))
5013 if (DECL_NAME (parm) != 0)
5014 warning ("parameter `%s' points to incomplete type",
5015 IDENTIFIER_POINTER (DECL_NAME (parm)));
5017 warning ("parameter points to incomplete type");
5021 typelt = TREE_CHAIN (typelt);
5028 /* Return a tree_list node with info on a parameter list just parsed.
5029 The TREE_PURPOSE is a chain of decls of those parms.
5030 The TREE_VALUE is a list of structure, union and enum tags defined.
5031 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5032 This tree_list node is later fed to `grokparms'.
5034 VOID_AT_END nonzero means append `void' to the end of the type-list.
5035 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5038 get_parm_info (void_at_end)
5041 register tree decl, t;
5042 register tree types = 0;
5044 tree tags = gettags ();
5045 tree parms = getdecls ();
5047 tree order = current_binding_level->parm_order;
5049 /* Just `void' (and no ellipsis) is special. There are really no parms.
5050 But if the `void' is qualified (by `const' or `volatile') or has a
5051 storage class specifier (`register'), then the behavior is undefined;
5052 by not counting it as the special case of `void' we will cause an
5053 error later. Typedefs for `void' are OK (see DR#157). */
5054 if (void_at_end && parms != 0
5055 && TREE_CHAIN (parms) == 0
5056 && VOID_TYPE_P (TREE_TYPE (parms))
5057 && ! TREE_THIS_VOLATILE (parms)
5058 && ! TREE_READONLY (parms)
5059 && ! DECL_REGISTER (parms)
5060 && DECL_NAME (parms) == 0)
5063 storedecls (NULL_TREE);
5064 return tree_cons (NULL_TREE, NULL_TREE,
5065 tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5068 /* Extract enumerator values and other non-parms declared with the parms.
5069 Likewise any forward parm decls that didn't have real parm decls. */
5070 for (decl = parms; decl;)
5072 tree next = TREE_CHAIN (decl);
5074 if (TREE_CODE (decl) != PARM_DECL)
5076 TREE_CHAIN (decl) = new_parms;
5079 else if (TREE_ASM_WRITTEN (decl))
5081 error_with_decl (decl,
5082 "parameter `%s' has just a forward declaration");
5083 TREE_CHAIN (decl) = new_parms;
5089 /* Put the parm decls back in the order they were in in the parm list. */
5090 for (t = order; t; t = TREE_CHAIN (t))
5093 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5095 TREE_CHAIN (TREE_VALUE (t)) = 0;
5098 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5101 /* Store the parmlist in the binding level since the old one
5102 is no longer a valid list. (We have changed the chain pointers.) */
5103 storedecls (new_parms);
5105 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5106 /* There may also be declarations for enumerators if an enumeration
5107 type is declared among the parms. Ignore them here. */
5108 if (TREE_CODE (decl) == PARM_DECL)
5110 /* Since there is a prototype,
5111 args are passed in their declared types. */
5112 tree type = TREE_TYPE (decl);
5113 DECL_ARG_TYPE (decl) = type;
5114 if (PROMOTE_PROTOTYPES
5115 && (TREE_CODE (type) == INTEGER_TYPE
5116 || TREE_CODE (type) == ENUMERAL_TYPE)
5117 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5118 DECL_ARG_TYPE (decl) = integer_type_node;
5120 types = tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5121 if (VOID_TYPE_P (TREE_VALUE (types)) && ! erred
5122 && DECL_NAME (decl) == 0)
5124 error ("`void' in parameter list must be the entire list");
5130 return tree_cons (new_parms, tags,
5131 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
5133 return tree_cons (new_parms, tags, nreverse (types));
5136 /* At end of parameter list, warn about any struct, union or enum tags
5137 defined within. Do so because these types cannot ever become complete. */
5140 parmlist_tags_warning ()
5145 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5147 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5148 /* An anonymous union parm type is meaningful as a GNU extension.
5149 So don't warn for that. */
5150 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5152 if (TREE_PURPOSE (elt) != 0)
5153 warning ("`%s %s' declared inside parameter list",
5154 (code == RECORD_TYPE ? "struct"
5155 : code == UNION_TYPE ? "union"
5157 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5160 /* For translation these need to be seperate warnings */
5161 if (code == RECORD_TYPE)
5162 warning ("anonymous struct declared inside parameter list");
5163 else if (code == UNION_TYPE)
5164 warning ("anonymous union declared inside parameter list");
5166 warning ("anonymous enum declared inside parameter list");
5170 warning ("its scope is only this definition or declaration, which is probably not what you want.");
5176 /* Get the struct, enum or union (CODE says which) with tag NAME.
5177 Define the tag as a forward-reference if it is not defined. */
5180 xref_tag (code, name)
5181 enum tree_code code;
5184 /* If a cross reference is requested, look up the type
5185 already defined for this tag and return it. */
5187 register tree ref = lookup_tag (code, name, current_binding_level, 0);
5188 /* Even if this is the wrong type of tag, return what we found.
5189 There will be an error message anyway, from pending_xref_error.
5190 If we create an empty xref just for an invalid use of the type,
5191 the main result is to create lots of superfluous error messages. */
5195 /* If no such tag is yet defined, create a forward-reference node
5196 and record it as the "definition".
5197 When a real declaration of this type is found,
5198 the forward-reference will be altered into a real type. */
5200 ref = make_node (code);
5201 if (code == ENUMERAL_TYPE)
5203 /* (In ANSI, Enums can be referred to only if already defined.) */
5205 pedwarn ("ISO C forbids forward references to `enum' types");
5206 /* Give the type a default layout like unsigned int
5207 to avoid crashing if it does not get defined. */
5208 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5209 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5210 TYPE_USER_ALIGN (ref) = 0;
5211 TREE_UNSIGNED (ref) = 1;
5212 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5213 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5214 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5217 pushtag (name, ref);
5222 /* Make sure that the tag NAME is defined *in the current binding level*
5223 at least as a forward reference.
5224 CODE says which kind of tag NAME ought to be. */
5227 start_struct (code, name)
5228 enum tree_code code;
5231 /* If there is already a tag defined at this binding level
5232 (as a forward reference), just return it. */
5234 register tree ref = 0;
5237 ref = lookup_tag (code, name, current_binding_level, 1);
5238 if (ref && TREE_CODE (ref) == code)
5240 C_TYPE_BEING_DEFINED (ref) = 1;
5241 TYPE_PACKED (ref) = flag_pack_struct;
5242 if (TYPE_FIELDS (ref))
5243 error ("redefinition of `%s %s'",
5244 code == UNION_TYPE ? "union" : "struct",
5245 IDENTIFIER_POINTER (name));
5250 /* Otherwise create a forward-reference just so the tag is in scope. */
5252 ref = make_node (code);
5253 pushtag (name, ref);
5254 C_TYPE_BEING_DEFINED (ref) = 1;
5255 TYPE_PACKED (ref) = flag_pack_struct;
5259 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5260 of a structure component, returning a FIELD_DECL node.
5261 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5263 This is done during the parsing of the struct declaration.
5264 The FIELD_DECL nodes are chained together and the lot of them
5265 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5268 grokfield (filename, line, declarator, declspecs, width)
5269 const char *filename ATTRIBUTE_UNUSED;
5270 int line ATTRIBUTE_UNUSED;
5271 tree declarator, declspecs, width;
5275 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5277 finish_decl (value, NULL_TREE, NULL_TREE);
5278 DECL_INITIAL (value) = width;
5280 maybe_objc_check_decl (value);
5284 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5285 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5286 ATTRIBUTES are attributes to be applied to the structure. */
5289 finish_struct (t, fieldlist, attributes)
5295 int toplevel = global_binding_level == current_binding_level;
5297 /* If this type was previously laid out as a forward reference,
5298 make sure we lay it out again. */
5302 decl_attributes (t, attributes, NULL_TREE);
5304 /* Nameless union parm types are useful as GCC extension. */
5305 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5306 /* Otherwise, warn about any struct or union def. in parmlist. */
5307 if (in_parm_level_p ())
5310 pedwarn ("%s defined inside parms",
5311 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5312 else if (! flag_traditional)
5313 warning ("%s defined inside parms",
5314 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5319 for (x = fieldlist; x; x = TREE_CHAIN (x))
5320 if (DECL_NAME (x) != 0)
5324 pedwarn ("%s has no %s",
5325 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
5326 fieldlist ? _("named members") : _("members"));
5329 /* Install struct as DECL_CONTEXT of each field decl.
5330 Also process specified field sizes,m which is found in the DECL_INITIAL.
5331 Store 0 there, except for ": 0" fields (so we can find them
5332 and delete them, below). */
5334 for (x = fieldlist; x; x = TREE_CHAIN (x))
5336 DECL_CONTEXT (x) = t;
5337 DECL_PACKED (x) |= TYPE_PACKED (t);
5339 /* If any field is const, the structure type is pseudo-const. */
5340 if (TREE_READONLY (x))
5341 C_TYPE_FIELDS_READONLY (t) = 1;
5344 /* A field that is pseudo-const makes the structure likewise. */
5345 tree t1 = TREE_TYPE (x);
5346 while (TREE_CODE (t1) == ARRAY_TYPE)
5347 t1 = TREE_TYPE (t1);
5348 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5349 && C_TYPE_FIELDS_READONLY (t1))
5350 C_TYPE_FIELDS_READONLY (t) = 1;
5353 /* Any field that is volatile means variables of this type must be
5354 treated in some ways as volatile. */
5355 if (TREE_THIS_VOLATILE (x))
5356 C_TYPE_FIELDS_VOLATILE (t) = 1;
5358 /* Any field of nominal variable size implies structure is too. */
5359 if (C_DECL_VARIABLE_SIZE (x))
5360 C_TYPE_VARIABLE_SIZE (t) = 1;
5362 /* Detect invalid nested redefinition. */
5363 if (TREE_TYPE (x) == t)
5364 error ("nested redefinition of `%s'",
5365 IDENTIFIER_POINTER (TYPE_NAME (t)));
5367 /* Detect invalid bit-field size. */
5368 if (DECL_INITIAL (x))
5369 STRIP_NOPS (DECL_INITIAL (x));
5370 if (DECL_INITIAL (x))
5372 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5373 constant_expression_warning (DECL_INITIAL (x));
5377 "bit-field `%s' width not an integer constant");
5378 DECL_INITIAL (x) = NULL;
5382 /* Detect invalid bit-field type. */
5383 if (DECL_INITIAL (x)
5384 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5385 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5387 error_with_decl (x, "bit-field `%s' has invalid type");
5388 DECL_INITIAL (x) = NULL;
5391 if (DECL_INITIAL (x) && pedantic
5392 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5393 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5394 /* Accept an enum that's equivalent to int or unsigned int. */
5395 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5396 && (TYPE_PRECISION (TREE_TYPE (x))
5397 == TYPE_PRECISION (integer_type_node))))
5398 pedwarn_with_decl (x, "bit-field `%s' type invalid in ISO C");
5400 /* Detect and ignore out of range field width and process valid
5402 if (DECL_INITIAL (x))
5404 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5405 error_with_decl (x, "negative width in bit-field `%s'");
5406 else if (0 < compare_tree_int (DECL_INITIAL (x),
5407 TYPE_PRECISION (TREE_TYPE (x))))
5408 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5409 else if (integer_zerop (DECL_INITIAL (x)) && DECL_NAME (x) != 0)
5410 error_with_decl (x, "zero width for bit-field `%s'");
5413 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
5414 unsigned HOST_WIDE_INT width
5415 = TREE_INT_CST_LOW (DECL_INITIAL (x));
5417 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5418 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5419 TREE_UNSIGNED (TREE_TYPE (x)))
5421 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5422 TREE_UNSIGNED (TREE_TYPE (x))))))
5423 warning_with_decl (x,
5424 "`%s' is narrower than values of its type");
5426 DECL_SIZE (x) = bitsize_int (width);
5427 DECL_BIT_FIELD (x) = DECL_C_BIT_FIELD (x) = 1;
5431 /* field size 0 => force desired amount of alignment. */
5432 #ifdef EMPTY_FIELD_BOUNDARY
5433 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5435 #ifdef PCC_BITFIELD_TYPE_MATTERS
5436 if (PCC_BITFIELD_TYPE_MATTERS)
5438 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5439 TYPE_ALIGN (TREE_TYPE (x)));
5440 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5447 else if (TREE_TYPE (x) != error_mark_node)
5449 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5450 : TYPE_ALIGN (TREE_TYPE (x)));
5452 /* Non-bit-fields are aligned for their type, except packed
5453 fields which require only BITS_PER_UNIT alignment. */
5454 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5455 if (! DECL_PACKED (x))
5456 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5459 DECL_INITIAL (x) = 0;
5462 /* Delete all duplicate fields from the fieldlist */
5463 for (x = fieldlist; x && TREE_CHAIN (x);)
5464 /* Anonymous fields aren't duplicates. */
5465 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5469 register tree y = fieldlist;
5473 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5479 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5481 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5482 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5488 /* Now we have the nearly final fieldlist. Record it,
5489 then lay out the structure or union (including the fields). */
5491 TYPE_FIELDS (t) = fieldlist;
5495 /* Delete all zero-width bit-fields from the fieldlist */
5497 tree *fieldlistp = &fieldlist;
5499 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5500 *fieldlistp = TREE_CHAIN (*fieldlistp);
5502 fieldlistp = &TREE_CHAIN (*fieldlistp);
5505 /* Now we have the truly final field list.
5506 Store it in this type and in the variants. */
5508 TYPE_FIELDS (t) = fieldlist;
5510 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5512 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5513 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5514 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5515 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5518 /* If this was supposed to be a transparent union, but we can't
5519 make it one, warn and turn off the flag. */
5520 if (TREE_CODE (t) == UNION_TYPE
5521 && TYPE_TRANSPARENT_UNION (t)
5522 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5524 TYPE_TRANSPARENT_UNION (t) = 0;
5525 warning ("union cannot be made transparent");
5528 /* If this structure or union completes the type of any previous
5529 variable declaration, lay it out and output its rtl. */
5531 if (current_binding_level->n_incomplete != 0)
5534 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5536 if (TREE_TYPE (decl) == t
5537 && TREE_CODE (decl) != TYPE_DECL)
5539 layout_decl (decl, 0);
5540 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5541 maybe_objc_check_decl (decl);
5542 rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0);
5545 --current_binding_level->n_incomplete;
5547 else if (!COMPLETE_TYPE_P (TREE_TYPE (decl))
5548 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5550 tree element = TREE_TYPE (decl);
5551 while (TREE_CODE (element) == ARRAY_TYPE)
5552 element = TREE_TYPE (element);
5554 layout_array_type (TREE_TYPE (decl));
5559 /* Finish debugging output for this type. */
5560 rest_of_type_compilation (t, toplevel);
5565 /* Lay out the type T, and its element type, and so on. */
5568 layout_array_type (t)
5571 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5572 layout_array_type (TREE_TYPE (t));
5576 /* Begin compiling the definition of an enumeration type.
5577 NAME is its name (or null if anonymous).
5578 Returns the type object, as yet incomplete.
5579 Also records info about it so that build_enumerator
5580 may be used to declare the individual values as they are read. */
5586 register tree enumtype = 0;
5588 /* If this is the real definition for a previous forward reference,
5589 fill in the contents in the same object that used to be the
5590 forward reference. */
5593 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5595 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5597 enumtype = make_node (ENUMERAL_TYPE);
5598 pushtag (name, enumtype);
5601 C_TYPE_BEING_DEFINED (enumtype) = 1;
5603 if (TYPE_VALUES (enumtype) != 0)
5605 /* This enum is a named one that has been declared already. */
5606 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5608 /* Completely replace its old definition.
5609 The old enumerators remain defined, however. */
5610 TYPE_VALUES (enumtype) = 0;
5613 enum_next_value = integer_zero_node;
5616 if (flag_short_enums)
5617 TYPE_PACKED (enumtype) = 1;
5622 /* After processing and defining all the values of an enumeration type,
5623 install their decls in the enumeration type and finish it off.
5624 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5625 and ATTRIBUTES are the specified attributes.
5626 Returns ENUMTYPE. */
5629 finish_enum (enumtype, values, attributes)
5634 register tree pair, tem;
5635 tree minnode = 0, maxnode = 0, enum_value_type;
5636 int precision, unsign;
5637 int toplevel = (global_binding_level == current_binding_level);
5639 if (in_parm_level_p ())
5640 warning ("enum defined inside parms");
5642 decl_attributes (enumtype, attributes, NULL_TREE);
5644 /* Calculate the maximum value of any enumerator in this type. */
5646 if (values == error_mark_node)
5647 minnode = maxnode = integer_zero_node;
5650 minnode = maxnode = TREE_VALUE (values);
5651 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5653 tree value = TREE_VALUE (pair);
5654 if (tree_int_cst_lt (maxnode, value))
5656 if (tree_int_cst_lt (value, minnode))
5661 /* Construct the final type of this enumeration. It is the same
5662 as one of the integral types - the narrowest one that fits, except
5663 that normally we only go as narrow as int - and signed iff any of
5664 the values are negative. */
5665 unsign = (tree_int_cst_sgn (minnode) >= 0);
5666 precision = MAX (min_precision (minnode, unsign),
5667 min_precision (maxnode, unsign));
5668 if (!TYPE_PACKED (enumtype))
5669 precision = MAX (precision, TYPE_PRECISION (integer_type_node));
5670 if (type_for_size (precision, unsign) == 0)
5672 warning ("enumeration values exceed range of largest integer");
5673 precision = TYPE_PRECISION (long_long_integer_type_node);
5676 if (precision == TYPE_PRECISION (integer_type_node))
5677 enum_value_type = type_for_size (precision, 0);
5679 enum_value_type = enumtype;
5681 TYPE_MIN_VALUE (enumtype) = minnode;
5682 TYPE_MAX_VALUE (enumtype) = maxnode;
5683 TYPE_PRECISION (enumtype) = precision;
5684 TREE_UNSIGNED (enumtype) = unsign;
5685 TYPE_SIZE (enumtype) = 0;
5686 layout_type (enumtype);
5688 if (values != error_mark_node)
5690 /* Change the type of the enumerators to be the enum type. We
5691 need to do this irrespective of the size of the enum, for
5692 proper type checking. Replace the DECL_INITIALs of the
5693 enumerators, and the value slots of the list, with copies
5694 that have the enum type; they cannot be modified in place
5695 because they may be shared (e.g. integer_zero_node) Finally,
5696 change the purpose slots to point to the names of the decls. */
5697 for (pair = values; pair; pair = TREE_CHAIN (pair))
5699 tree enu = TREE_PURPOSE (pair);
5701 TREE_TYPE (enu) = enumtype;
5702 DECL_SIZE (enu) = TYPE_SIZE (enumtype);
5703 DECL_SIZE_UNIT (enu) = TYPE_SIZE_UNIT (enumtype);
5704 DECL_ALIGN (enu) = TYPE_ALIGN (enumtype);
5705 DECL_USER_ALIGN (enu) = TYPE_USER_ALIGN (enumtype);
5706 DECL_MODE (enu) = TYPE_MODE (enumtype);
5708 /* The ISO C Standard mandates enumerators to have type int,
5709 even though the underlying type of an enum type is
5710 unspecified. Here we convert any enumerators that fit in
5711 an int to type int, to avoid promotions to unsigned types
5712 when comparing integers with enumerators that fit in the
5713 int range. When -pedantic is given, build_enumerator()
5714 would have already taken care of those that don't fit. */
5715 if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
5716 DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
5718 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5720 TREE_PURPOSE (pair) = DECL_NAME (enu);
5721 TREE_VALUE (pair) = DECL_INITIAL (enu);
5724 TYPE_VALUES (enumtype) = values;
5727 /* Fix up all variant types of this enum type. */
5728 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5730 if (tem == enumtype)
5732 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5733 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5734 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5735 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5736 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5737 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5738 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5739 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5740 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5741 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5744 /* Finish debugging output for this type. */
5745 rest_of_type_compilation (enumtype, toplevel);
5750 /* Build and install a CONST_DECL for one value of the
5751 current enumeration type (one that was begun with start_enum).
5752 Return a tree-list containing the CONST_DECL and its value.
5753 Assignment of sequential values by default is handled here. */
5756 build_enumerator (name, value)
5759 register tree decl, type;
5761 /* Validate and default VALUE. */
5763 /* Remove no-op casts from the value. */
5765 STRIP_TYPE_NOPS (value);
5769 if (TREE_CODE (value) == INTEGER_CST)
5771 value = default_conversion (value);
5772 constant_expression_warning (value);
5776 error ("enumerator value for `%s' not integer constant",
5777 IDENTIFIER_POINTER (name));
5782 /* Default based on previous value. */
5783 /* It should no longer be possible to have NON_LVALUE_EXPR
5787 value = enum_next_value;
5789 error ("overflow in enumeration values");
5792 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5794 pedwarn ("ISO C restricts enumerator values to range of `int'");
5795 value = convert (integer_type_node, value);
5798 /* Set basis for default for next value. */
5799 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5800 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5802 /* Now create a declaration for the enum value name. */
5804 type = TREE_TYPE (value);
5805 type = type_for_size (MAX (TYPE_PRECISION (type),
5806 TYPE_PRECISION (integer_type_node)),
5808 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
5809 && TREE_UNSIGNED (type)));
5811 decl = build_decl (CONST_DECL, name, type);
5812 DECL_INITIAL (decl) = convert (type, value);
5815 return tree_cons (decl, value, NULL_TREE);
5819 /* Create the FUNCTION_DECL for a function definition.
5820 DECLSPECS, DECLARATOR, PREFIX_ATTRIBUTES and ATTRIBUTES are the parts of
5821 the declaration; they describe the function's name and the type it returns,
5822 but twisted together in a fashion that parallels the syntax of C.
5824 This function creates a binding context for the function body
5825 as well as setting up the FUNCTION_DECL in current_function_decl.
5827 Returns 1 on success. If the DECLARATOR is not suitable for a function
5828 (it defines a datum instead), we return 0, which tells
5829 yyparse to report a parse error. */
5832 start_function (declspecs, declarator, prefix_attributes, attributes)
5833 tree declarator, declspecs, prefix_attributes, attributes;
5835 tree decl1, old_decl;
5837 int old_immediate_size_expand = immediate_size_expand;
5839 current_function_returns_value = 0; /* Assume, until we see it does. */
5840 current_function_returns_null = 0;
5841 warn_about_return_type = 0;
5842 current_extern_inline = 0;
5843 c_function_varargs = 0;
5845 shadowed_labels = 0;
5847 /* Don't expand any sizes in the return type of the function. */
5848 immediate_size_expand = 0;
5850 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
5852 /* If the declarator is not suitable for a function definition,
5853 cause a syntax error. */
5856 immediate_size_expand = old_immediate_size_expand;
5860 decl_attributes (decl1, prefix_attributes, attributes);
5862 announce_function (decl1);
5864 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5866 error ("return type is an incomplete type");
5867 /* Make it return void instead. */
5869 = build_function_type (void_type_node,
5870 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5873 if (warn_about_return_type)
5874 pedwarn_c99 ("return type defaults to `int'");
5876 /* Save the parm names or decls from this function's declarator
5877 where store_parm_decls will find them. */
5878 current_function_parms = last_function_parms;
5879 current_function_parm_tags = last_function_parm_tags;
5881 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5882 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5883 DECL_INITIAL (decl1) = error_mark_node;
5885 /* If this definition isn't a prototype and we had a prototype declaration
5886 before, copy the arg type info from that prototype.
5887 But not if what we had before was a builtin function. */
5888 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5889 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5890 && !DECL_BUILT_IN (old_decl)
5891 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5892 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5893 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5895 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5896 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
5897 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
5900 /* If there is no explicit declaration, look for any out-of-scope implicit
5903 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
5905 /* Optionally warn of old-fashioned def with no previous prototype. */
5906 if (warn_strict_prototypes
5907 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5908 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
5909 warning ("function declaration isn't a prototype");
5910 /* Optionally warn of any global def with no previous prototype. */
5911 else if (warn_missing_prototypes
5912 && TREE_PUBLIC (decl1)
5913 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0)
5914 && ! MAIN_NAME_P (DECL_NAME (decl1)))
5915 warning_with_decl (decl1, "no previous prototype for `%s'");
5916 /* Optionally warn of any def with no previous prototype
5917 if the function has already been used. */
5918 else if (warn_missing_prototypes
5919 && old_decl != 0 && TREE_USED (old_decl)
5920 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
5921 warning_with_decl (decl1,
5922 "`%s' was used with no prototype before its definition");
5923 /* Optionally warn of any global def with no previous declaration. */
5924 else if (warn_missing_declarations
5925 && TREE_PUBLIC (decl1)
5927 && ! MAIN_NAME_P (DECL_NAME (decl1)))
5928 warning_with_decl (decl1, "no previous declaration for `%s'");
5929 /* Optionally warn of any def with no previous declaration
5930 if the function has already been used. */
5931 else if (warn_missing_declarations
5932 && old_decl != 0 && TREE_USED (old_decl)
5933 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
5934 warning_with_decl (decl1,
5935 "`%s' was used with no declaration before its definition");
5937 /* This is a definition, not a reference.
5938 So normally clear DECL_EXTERNAL.
5939 However, `extern inline' acts like a declaration
5940 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5941 DECL_EXTERNAL (decl1) = current_extern_inline;
5943 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
5944 SET_DEFAULT_DECL_ATTRIBUTES (decl1, attributes);
5947 /* This function exists in static storage.
5948 (This does not mean `static' in the C sense!) */
5949 TREE_STATIC (decl1) = 1;
5951 /* A nested function is not global. */
5952 if (current_function_decl != 0)
5953 TREE_PUBLIC (decl1) = 0;
5955 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5956 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
5961 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5962 != integer_type_node)
5963 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
5965 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
5966 args = TREE_CHAIN (args))
5968 tree type = args ? TREE_VALUE (args) : 0;
5970 if (type == void_type_node)
5977 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
5978 pedwarn_with_decl (decl1,
5979 "first argument of `%s' should be `int'");
5983 if (TREE_CODE (type) != POINTER_TYPE
5984 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5985 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5987 pedwarn_with_decl (decl1,
5988 "second argument of `%s' should be `char **'");
5992 if (TREE_CODE (type) != POINTER_TYPE
5993 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
5994 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
5996 pedwarn_with_decl (decl1,
5997 "third argument of `%s' should probably be `char **'");
6002 /* It is intentional that this message does not mention the third
6003 argument, which is warned for only pedantically, because it's
6004 blessed by mention in an appendix of the standard. */
6005 if (argct > 0 && (argct < 2 || argct > 3))
6006 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
6008 if (argct == 3 && pedantic)
6009 pedwarn_with_decl (decl1, "third argument of `%s' is deprecated");
6011 if (! TREE_PUBLIC (decl1))
6012 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
6015 /* Record the decl so that the function name is defined.
6016 If we already have a decl for this name, and it is a FUNCTION_DECL,
6017 use the old decl. */
6019 current_function_decl = pushdecl (decl1);
6022 declare_parm_level (1);
6023 current_binding_level->subblocks_tag_transparent = 1;
6025 make_function_rtl (current_function_decl);
6027 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6028 /* Promote the value to int before returning it. */
6029 if (C_PROMOTING_INTEGER_TYPE_P (restype))
6031 /* It retains unsignedness if traditional
6032 or if not really getting wider. */
6033 if (TREE_UNSIGNED (restype)
6034 && (flag_traditional
6035 || (TYPE_PRECISION (restype)
6036 == TYPE_PRECISION (integer_type_node))))
6037 restype = unsigned_type_node;
6039 restype = integer_type_node;
6041 DECL_RESULT (current_function_decl)
6042 = build_decl (RESULT_DECL, NULL_TREE, restype);
6044 /* If this fcn was already referenced via a block-scope `extern' decl
6045 (or an implicit decl), propagate certain information about the usage. */
6046 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6047 TREE_ADDRESSABLE (current_function_decl) = 1;
6049 immediate_size_expand = old_immediate_size_expand;
6054 /* Record that this function is going to be a varargs function.
6055 This is called before store_parm_decls, which is too early
6056 to call mark_varargs directly. */
6061 c_function_varargs = 1;
6064 /* Store the parameter declarations into the current function declaration.
6065 This is called after parsing the parameter declarations, before
6066 digesting the body of the function.
6068 For an old-style definition, modify the function's type
6069 to specify at least the number of arguments. */
6074 register tree fndecl = current_function_decl;
6077 /* This is either a chain of PARM_DECLs (if a prototype was used)
6078 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6079 tree specparms = current_function_parms;
6081 /* This is a list of types declared among parms in a prototype. */
6082 tree parmtags = current_function_parm_tags;
6084 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6085 register tree parmdecls = getdecls ();
6087 /* This is a chain of any other decls that came in among the parm
6088 declarations. If a parm is declared with enum {foo, bar} x;
6089 then CONST_DECLs for foo and bar are put here. */
6092 /* Nonzero if this definition is written with a prototype. */
6095 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6097 /* This case is when the function was defined with an ANSI prototype.
6098 The parms already have decls, so we need not do anything here
6099 except record them as in effect
6100 and complain if any redundant old-style parm decls were written. */
6111 error_with_decl (fndecl,
6112 "parm types given both in parmlist and separately");
6113 /* Get rid of the erroneous decls; don't keep them on
6114 the list of parms, since they might not be PARM_DECLs. */
6115 for (decl = current_binding_level->names;
6116 decl; decl = TREE_CHAIN (decl))
6117 if (DECL_NAME (decl))
6118 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6119 for (link = current_binding_level->shadowed;
6120 link; link = TREE_CHAIN (link))
6121 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6122 current_binding_level->names = 0;
6123 current_binding_level->shadowed = 0;
6126 specparms = nreverse (specparms);
6127 for (parm = specparms; parm; parm = next)
6129 next = TREE_CHAIN (parm);
6130 if (TREE_CODE (parm) == PARM_DECL)
6132 if (DECL_NAME (parm) == 0)
6133 error_with_decl (parm, "parameter name omitted");
6134 else if (TREE_CODE (TREE_TYPE (parm)) != ERROR_MARK
6135 && VOID_TYPE_P (TREE_TYPE (parm)))
6137 error_with_decl (parm, "parameter `%s' declared void");
6138 /* Change the type to error_mark_node so this parameter
6139 will be ignored by assign_parms. */
6140 TREE_TYPE (parm) = error_mark_node;
6146 /* If we find an enum constant or a type tag,
6147 put it aside for the moment. */
6148 TREE_CHAIN (parm) = 0;
6149 others = chainon (others, parm);
6153 /* Get the decls in their original chain order
6154 and record in the function. */
6155 DECL_ARGUMENTS (fndecl) = getdecls ();
6158 /* If this function takes a variable number of arguments,
6159 add a phony parameter to the end of the parm list,
6160 to represent the position of the first unnamed argument. */
6161 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6164 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6165 /* Let's hope the address of the unnamed parm
6166 won't depend on its type. */
6167 TREE_TYPE (dummy) = integer_type_node;
6168 DECL_ARG_TYPE (dummy) = integer_type_node;
6169 DECL_ARGUMENTS (fndecl) = chainon (DECL_ARGUMENTS (fndecl), dummy);
6173 /* Now pushdecl the enum constants. */
6174 for (parm = others; parm; parm = next)
6176 next = TREE_CHAIN (parm);
6177 if (DECL_NAME (parm) == 0)
6179 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6181 else if (TREE_CODE (parm) != PARM_DECL)
6185 storetags (chainon (parmtags, gettags ()));
6189 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6190 each with a parm name as the TREE_VALUE.
6192 PARMDECLS is a chain of declarations for parameters.
6193 Warning! It can also contain CONST_DECLs which are not parameters
6194 but are names of enumerators of any enum types
6195 declared among the parameters.
6197 First match each formal parameter name with its declaration.
6198 Associate decls with the names and store the decls
6199 into the TREE_PURPOSE slots. */
6201 /* We use DECL_WEAK as a flag to show which parameters have been
6202 seen already since it is not used on PARM_DECL or CONST_DECL. */
6203 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6204 DECL_WEAK (parm) = 0;
6206 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6208 register tree tail, found = NULL;
6210 if (TREE_VALUE (parm) == 0)
6212 error_with_decl (fndecl,
6213 "parameter name missing from parameter list");
6214 TREE_PURPOSE (parm) = 0;
6218 /* See if any of the parmdecls specifies this parm by name.
6219 Ignore any enumerator decls. */
6220 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6221 if (DECL_NAME (tail) == TREE_VALUE (parm)
6222 && TREE_CODE (tail) == PARM_DECL)
6228 /* If declaration already marked, we have a duplicate name.
6229 Complain, and don't use this decl twice. */
6230 if (found && DECL_WEAK (found))
6232 error_with_decl (found, "multiple parameters named `%s'");
6236 /* If the declaration says "void", complain and ignore it. */
6237 if (found && VOID_TYPE_P (TREE_TYPE (found)))
6239 error_with_decl (found, "parameter `%s' declared void");
6240 TREE_TYPE (found) = integer_type_node;
6241 DECL_ARG_TYPE (found) = integer_type_node;
6242 layout_decl (found, 0);
6245 /* Traditionally, a parm declared float is actually a double. */
6246 if (found && flag_traditional
6247 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6249 TREE_TYPE (found) = double_type_node;
6250 DECL_ARG_TYPE (found) = double_type_node;
6251 layout_decl (found, 0);
6254 /* If no declaration found, default to int. */
6257 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6259 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6260 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6261 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6263 pedwarn_with_decl (found, "type of `%s' defaults to `int'");
6264 else if (extra_warnings)
6265 warning_with_decl (found, "type of `%s' defaults to `int'");
6269 TREE_PURPOSE (parm) = found;
6271 /* Mark this decl as "already found". */
6272 DECL_WEAK (found) = 1;
6275 /* Put anything which is on the parmdecls chain and which is
6276 not a PARM_DECL onto the list NONPARMS. (The types of
6277 non-parm things which might appear on the list include
6278 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6279 any actual PARM_DECLs not matched with any names. */
6282 for (parm = parmdecls; parm;)
6284 tree next = TREE_CHAIN (parm);
6285 TREE_CHAIN (parm) = 0;
6287 if (TREE_CODE (parm) != PARM_DECL)
6288 nonparms = chainon (nonparms, parm);
6291 /* Complain about args with incomplete types. */
6292 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6294 error_with_decl (parm, "parameter `%s' has incomplete type");
6295 TREE_TYPE (parm) = error_mark_node;
6298 if (! DECL_WEAK (parm))
6300 error_with_decl (parm,
6301 "declaration for parameter `%s' but no such parameter");
6302 /* Pretend the parameter was not missing.
6303 This gets us to a standard state and minimizes
6304 further error messages. */
6306 = chainon (specparms,
6307 tree_cons (parm, NULL_TREE, NULL_TREE));
6314 /* Chain the declarations together in the order of the list of
6315 names. Store that chain in the function decl, replacing the
6318 DECL_ARGUMENTS (fndecl) = 0;
6321 for (last = 0; parm; parm = TREE_CHAIN (parm))
6322 if (TREE_PURPOSE (parm))
6325 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6327 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6328 last = TREE_PURPOSE (parm);
6329 TREE_CHAIN (last) = 0;
6333 /* If there was a previous prototype,
6334 set the DECL_ARG_TYPE of each argument according to
6335 the type previously specified, and report any mismatches. */
6337 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6340 for (parm = DECL_ARGUMENTS (fndecl),
6341 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6342 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6343 != void_type_node));
6344 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6346 if (parm == 0 || type == 0
6347 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6349 error ("number of arguments doesn't match prototype");
6350 error_with_file_and_line (current_function_prototype_file,
6351 current_function_prototype_line,
6352 "prototype declaration");
6355 /* Type for passing arg must be consistent
6356 with that declared for the arg. */
6357 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
6359 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6360 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6362 /* Adjust argument to match prototype. E.g. a previous
6363 `int foo(float);' prototype causes
6364 `int foo(x) float x; {...}' to be treated like
6365 `int foo(float x) {...}'. This is particularly
6366 useful for argument types like uid_t. */
6367 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6369 if (PROMOTE_PROTOTYPES
6370 && (TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
6371 || TREE_CODE (TREE_TYPE (parm)) == ENUMERAL_TYPE)
6372 && TYPE_PRECISION (TREE_TYPE (parm))
6373 < TYPE_PRECISION (integer_type_node))
6374 DECL_ARG_TYPE (parm) = integer_type_node;
6378 pedwarn ("promoted argument `%s' doesn't match prototype",
6379 IDENTIFIER_POINTER (DECL_NAME (parm)));
6380 warning_with_file_and_line
6381 (current_function_prototype_file,
6382 current_function_prototype_line,
6383 "prototype declaration");
6386 /* If -traditional, allow `int' argument to match
6387 `unsigned' prototype. */
6388 else if (! (flag_traditional
6389 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6390 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6392 error ("argument `%s' doesn't match prototype",
6393 IDENTIFIER_POINTER (DECL_NAME (parm)));
6394 error_with_file_and_line (current_function_prototype_file,
6395 current_function_prototype_line,
6396 "prototype declaration");
6400 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6403 /* Otherwise, create a prototype that would match. */
6407 tree actual = 0, last = 0, type;
6409 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6411 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6413 TREE_CHAIN (last) = type;
6418 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6420 TREE_CHAIN (last) = type;
6424 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6425 of the type of this function, but we need to avoid having this
6426 affect the types of other similarly-typed functions, so we must
6427 first force the generation of an identical (but separate) type
6428 node for the relevant function type. The new node we create
6429 will be a variant of the main variant of the original function
6432 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6434 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6437 /* Now store the final chain of decls for the arguments
6438 as the decl-chain of the current lexical scope.
6439 Put the enumerators in as well, at the front so that
6440 DECL_ARGUMENTS is not modified. */
6442 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6445 /* Make sure the binding level for the top of the function body
6446 gets a BLOCK if there are any in the function.
6447 Otherwise, the dbx output is wrong. */
6449 keep_next_if_subblocks = 1;
6451 /* ??? This might be an improvement,
6452 but needs to be thought about some more. */
6454 keep_next_level_flag = 1;
6457 /* Write a record describing this function definition to the prototypes
6458 file (if requested). */
6460 gen_aux_info_record (fndecl, 1, 0, prototype);
6462 /* Initialize the RTL code for the function. */
6464 init_function_start (fndecl, input_filename, lineno);
6466 /* Begin the statement tree for this function. */
6467 DECL_LANG_SPECIFIC (current_function_decl)
6468 =((struct lang_decl *) ggc_alloc (sizeof (struct lang_decl)));
6469 begin_stmt_tree (&DECL_SAVED_TREE (current_function_decl));
6471 /* This function is being processed in whole-function mode. */
6472 cfun->x_whole_function_mode_p = 1;
6474 /* Even though we're inside a function body, we still don't want to
6475 call expand_expr to calculate the size of a variable-sized array.
6476 We haven't necessarily assigned RTL to all variables yet, so it's
6477 not safe to try to expand expressions involving them. */
6478 immediate_size_expand = 0;
6479 cfun->x_dont_save_pending_sizes_p = 1;
6482 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6483 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6484 stands for an ellipsis in the identifier list.
6486 PARMLIST is the data returned by get_parm_info for the
6487 parmlist that follows the semicolon.
6489 We return a value of the same sort that get_parm_info returns,
6490 except that it describes the combination of identifiers and parmlist. */
6493 combine_parm_decls (specparms, parmlist, void_at_end)
6494 tree specparms, parmlist;
6497 register tree fndecl = current_function_decl;
6500 tree parmdecls = TREE_PURPOSE (parmlist);
6502 /* This is a chain of any other decls that came in among the parm
6503 declarations. They were separated already by get_parm_info,
6504 so we just need to keep them separate. */
6505 tree nonparms = TREE_VALUE (parmlist);
6509 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6510 DECL_WEAK (parm) = 0;
6512 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6514 register tree tail, found = NULL;
6516 /* See if any of the parmdecls specifies this parm by name. */
6517 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6518 if (DECL_NAME (tail) == TREE_VALUE (parm))
6524 /* If declaration already marked, we have a duplicate name.
6525 Complain, and don't use this decl twice. */
6526 if (found && DECL_WEAK (found))
6528 error_with_decl (found, "multiple parameters named `%s'");
6532 /* If the declaration says "void", complain and ignore it. */
6533 if (found && VOID_TYPE_P (TREE_TYPE (found)))
6535 error_with_decl (found, "parameter `%s' declared void");
6536 TREE_TYPE (found) = integer_type_node;
6537 DECL_ARG_TYPE (found) = integer_type_node;
6538 layout_decl (found, 0);
6541 /* Traditionally, a parm declared float is actually a double. */
6542 if (found && flag_traditional
6543 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6545 TREE_TYPE (found) = double_type_node;
6546 DECL_ARG_TYPE (found) = double_type_node;
6547 layout_decl (found, 0);
6550 /* If no declaration found, default to int. */
6553 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6555 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6556 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6557 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6558 error_with_decl (found, "type of parameter `%s' is not declared");
6562 TREE_PURPOSE (parm) = found;
6564 /* Mark this decl as "already found". */
6565 DECL_WEAK (found) = 1;
6568 /* Complain about any actual PARM_DECLs not matched with any names. */
6570 for (parm = parmdecls; parm;)
6572 tree next = TREE_CHAIN (parm);
6573 TREE_CHAIN (parm) = 0;
6575 /* Complain about args with incomplete types. */
6576 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6578 error_with_decl (parm, "parameter `%s' has incomplete type");
6579 TREE_TYPE (parm) = error_mark_node;
6582 if (! DECL_WEAK (parm))
6584 error_with_decl (parm,
6585 "declaration for parameter `%s' but no such parameter");
6586 /* Pretend the parameter was not missing.
6587 This gets us to a standard state and minimizes
6588 further error messages. */
6590 = chainon (specparms,
6591 tree_cons (parm, NULL_TREE, NULL_TREE));
6597 /* Chain the declarations together in the order of the list of names.
6598 At the same time, build up a list of their types, in reverse order. */
6604 for (last = 0; parm; parm = TREE_CHAIN (parm))
6605 if (TREE_PURPOSE (parm))
6608 parmdecls = TREE_PURPOSE (parm);
6610 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6611 last = TREE_PURPOSE (parm);
6612 TREE_CHAIN (last) = 0;
6614 types = tree_cons (NULL_TREE, TREE_TYPE (parm), types);
6619 return tree_cons (parmdecls, nonparms,
6620 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
6622 return tree_cons (parmdecls, nonparms, nreverse (types));
6625 /* Finish up a function declaration and compile that function
6626 all the way to assembler language output. The free the storage
6627 for the function definition.
6629 This is called after parsing the body of the function definition.
6631 NESTED is nonzero if the function being finished is nested in another. */
6634 finish_function (nested)
6637 register tree fndecl = current_function_decl;
6639 /* TREE_READONLY (fndecl) = 1;
6640 This caused &foo to be of type ptr-to-const-function
6641 which then got a warning when stored in a ptr-to-function variable. */
6644 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6646 /* Must mark the RESULT_DECL as being in this function. */
6648 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6650 /* Obey `register' declarations if `setjmp' is called in this fn. */
6651 if (flag_traditional && current_function_calls_setjmp)
6653 setjmp_protect (DECL_INITIAL (fndecl));
6654 setjmp_protect_args ();
6657 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6659 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6660 != integer_type_node)
6662 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6663 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6665 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
6669 #ifdef DEFAULT_MAIN_RETURN
6670 /* Make it so that `main' always returns success by default. */
6671 DEFAULT_MAIN_RETURN;
6674 c_expand_return (integer_zero_node);
6679 /* Tie off the statement tree for this function. */
6680 finish_stmt_tree (&DECL_SAVED_TREE (fndecl));
6681 /* Clear out memory we no longer need. */
6682 free_after_parsing (cfun);
6683 /* Since we never call rest_of_compilation, we never clear
6684 CFUN. Do so explicitly. */
6685 free_after_compilation (cfun);
6690 /* Generate RTL for the body of this function. */
6691 c_expand_body (fndecl, nested);
6692 /* Let the error reporting routines know that we're outside a
6693 function. For a nested function, this value is used in
6694 pop_c_function_context and then reset via pop_function_context. */
6695 current_function_decl = NULL;
6699 /* Generate the RTL for the body of FNDECL. If NESTED_P is non-zero,
6700 then we are already in the process of generating RTL for another
6704 c_expand_body (fndecl, nested_p)
6708 /* Squirrel away our current state. */
6710 push_function_context ();
6712 /* Initialize the RTL code for the function. */
6713 current_function_decl = fndecl;
6714 init_function_start (fndecl, input_filename, lineno);
6716 /* This function is being processed in whole-function mode. */
6717 cfun->x_whole_function_mode_p = 1;
6719 /* Even though we're inside a function body, we still don't want to
6720 call expand_expr to calculate the size of a variable-sized array.
6721 We haven't necessarily assigned RTL to all variables yet, so it's
6722 not safe to try to expand expressions involving them. */
6723 immediate_size_expand = 0;
6724 cfun->x_dont_save_pending_sizes_p = 1;
6726 /* If this is a varargs function, inform function.c. */
6727 if (c_function_varargs)
6730 /* Set up parameters and prepare for return, for the function. */
6731 expand_function_start (fndecl, 0);
6733 /* If this function is `main', emit a call to `__main'
6734 to run global initializers, etc. */
6735 if (DECL_NAME (fndecl)
6736 && MAIN_NAME_P (DECL_NAME (fndecl))
6737 && DECL_CONTEXT (fndecl) == NULL_TREE)
6738 expand_main_function ();
6740 /* Generate the RTL for this function. */
6741 expand_stmt (DECL_SAVED_TREE (fndecl));
6742 /* Allow the body of the function to be garbage collected. */
6743 DECL_SAVED_TREE (fndecl) = NULL_TREE;
6745 /* We hard-wired immediate_size_expand to zero in start_function.
6746 expand_function_end will decrement this variable. So, we set the
6747 variable to one here, so that after the decrement it will remain
6749 immediate_size_expand = 1;
6751 /* Allow language dialects to perform special processing. */
6752 if (lang_expand_function_end)
6753 (*lang_expand_function_end) ();
6755 /* Generate rtl for function exit. */
6756 expand_function_end (input_filename, lineno, 0);
6758 /* So we can tell if jump_optimize sets it to 1. */
6761 /* If this is a nested function, protect the local variables in the stack
6762 above us from being collected while we're compiling this function. */
6764 ggc_push_context ();
6766 /* Run the optimizers and output the assembler code for this function. */
6767 rest_of_compilation (fndecl);
6769 /* Undo the GC context switch. */
6773 current_function_returns_null |= can_reach_end;
6775 if (warn_missing_noreturn
6776 && !TREE_THIS_VOLATILE (fndecl)
6777 && !current_function_returns_null
6778 && !current_function_returns_value)
6779 warning ("function might be possible candidate for attribute `noreturn'");
6781 if (TREE_THIS_VOLATILE (fndecl) && current_function_returns_null)
6782 warning ("`noreturn' function does return");
6783 else if (warn_return_type && can_reach_end
6784 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (fndecl))))
6785 /* If this function returns non-void and control can drop through,
6787 warning ("control reaches end of non-void function");
6788 /* With just -W, complain only if function returns both with
6789 and without a value. */
6790 else if (extra_warnings
6791 && current_function_returns_value && current_function_returns_null)
6792 warning ("this function may return with or without a value");
6794 /* If requested, warn about function definitions where the function will
6795 return a value (usually of some struct or union type) which itself will
6796 take up a lot of stack space. */
6798 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6800 tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6802 if (ret_type && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST
6803 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type),
6806 unsigned int size_as_int
6807 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type));
6809 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0)
6810 warning_with_decl (fndecl,
6811 "size of return value of `%s' is %u bytes",
6814 warning_with_decl (fndecl,
6815 "size of return value of `%s' is larger than %d bytes",
6820 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested_p)
6822 /* Stop pointing to the local nodes about to be freed.
6823 But DECL_INITIAL must remain nonzero so we know this
6824 was an actual function definition.
6825 For a nested function, this is done in pop_c_function_context.
6826 If rest_of_compilation set this to 0, leave it 0. */
6827 if (DECL_INITIAL (fndecl) != 0)
6828 DECL_INITIAL (fndecl) = error_mark_node;
6830 DECL_ARGUMENTS (fndecl) = 0;
6833 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6835 #ifndef ASM_OUTPUT_CONSTRUCTOR
6836 if (! flag_gnu_linker)
6837 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6840 assemble_constructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl)));
6843 if (DECL_STATIC_DESTRUCTOR (fndecl))
6845 #ifndef ASM_OUTPUT_DESTRUCTOR
6846 if (! flag_gnu_linker)
6847 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6850 assemble_destructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl)));
6855 /* Return to the enclosing function. */
6856 pop_function_context ();
6857 /* If the nested function was inline, write it out if that is
6859 if (!TREE_ASM_WRITTEN (fndecl) && TREE_ADDRESSABLE (fndecl))
6861 push_function_context ();
6862 output_inline_function (fndecl);
6863 pop_function_context ();
6869 /* Save and restore the variables in this file and elsewhere
6870 that keep track of the progress of compilation of the current function.
6871 Used for nested functions. */
6873 struct c_language_function
6875 struct language_function base;
6877 tree shadowed_labels;
6880 int warn_about_return_type;
6882 struct binding_level *binding_level;
6885 /* Save and reinitialize the variables
6886 used during compilation of a C function. */
6889 push_c_function_context (f)
6892 struct c_language_function *p;
6893 p = ((struct c_language_function *)
6894 xmalloc (sizeof (struct c_language_function)));
6895 f->language = (struct language_function *) p;
6897 p->base.x_stmt_tree = c_stmt_tree;
6898 p->base.x_scope_stmt_stack = c_scope_stmt_stack;
6899 p->base.x_function_name_declared_p = c_function_name_declared_p;
6900 p->named_labels = named_labels;
6901 p->shadowed_labels = shadowed_labels;
6902 p->returns_value = current_function_returns_value;
6903 p->returns_null = current_function_returns_null;
6904 p->warn_about_return_type = warn_about_return_type;
6905 p->extern_inline = current_extern_inline;
6906 p->binding_level = current_binding_level;
6909 /* Restore the variables used during compilation of a C function. */
6912 pop_c_function_context (f)
6915 struct c_language_function *p
6916 = (struct c_language_function *) f->language;
6919 /* Bring back all the labels that were shadowed. */
6920 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
6921 if (DECL_NAME (TREE_VALUE (link)) != 0)
6922 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
6923 = TREE_VALUE (link);
6925 if (DECL_SAVED_INSNS (current_function_decl) == 0
6926 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
6928 /* Stop pointing to the local nodes about to be freed. */
6929 /* But DECL_INITIAL must remain nonzero so we know this
6930 was an actual function definition. */
6931 DECL_INITIAL (current_function_decl) = error_mark_node;
6932 DECL_ARGUMENTS (current_function_decl) = 0;
6935 c_stmt_tree = p->base.x_stmt_tree;
6936 c_scope_stmt_stack = p->base.x_scope_stmt_stack;
6937 c_function_name_declared_p = p->base.x_function_name_declared_p;
6938 named_labels = p->named_labels;
6939 shadowed_labels = p->shadowed_labels;
6940 current_function_returns_value = p->returns_value;
6941 current_function_returns_null = p->returns_null;
6942 warn_about_return_type = p->warn_about_return_type;
6943 current_extern_inline = p->extern_inline;
6944 current_binding_level = p->binding_level;
6950 /* Mark the language specific parts of F for GC. */
6953 mark_c_function_context (f)
6956 struct c_language_function *p
6957 = (struct c_language_function *) f->language;
6962 mark_c_language_function (&p->base);
6963 ggc_mark_tree (p->shadowed_labels);
6964 ggc_mark_tree (p->named_labels);
6965 mark_binding_level (&p->binding_level);
6968 /* Copy the DECL_LANG_SEPECIFIC data associated with NODE. */
6971 copy_lang_decl (decl)
6974 struct lang_decl *ld;
6976 if (!DECL_LANG_SPECIFIC (decl))
6979 ld = (struct lang_decl *) ggc_alloc (sizeof (struct lang_decl));
6980 bcopy ((char *)DECL_LANG_SPECIFIC (decl), (char *)ld,
6981 sizeof (struct lang_decl));
6982 DECL_LANG_SPECIFIC (decl) = ld;
6985 /* Mark ARG for GC. */
6988 lang_mark_false_label_stack (arg)
6989 struct label_node *arg;
6991 /* C doesn't use false_label_stack. It better be NULL. */
6996 /* Mark the language specific bits in T for GC. */
7002 if (TREE_CODE (t) == IDENTIFIER_NODE)
7004 struct lang_identifier *i = (struct lang_identifier *) t;
7005 ggc_mark_tree (i->global_value);
7006 ggc_mark_tree (i->local_value);
7007 ggc_mark_tree (i->label_value);
7008 ggc_mark_tree (i->implicit_decl);
7009 ggc_mark_tree (i->error_locus);
7010 ggc_mark_tree (i->limbo_value);
7012 else if (TYPE_P (t) && TYPE_LANG_SPECIFIC (t))
7013 ggc_mark (TYPE_LANG_SPECIFIC (t));
7014 else if (DECL_P (t) && DECL_LANG_SPECIFIC (t))
7016 ggc_mark (DECL_LANG_SPECIFIC (t));
7017 c_mark_lang_decl (&DECL_LANG_SPECIFIC (t)->base);
7021 /* The functions below are required for functionality of doing
7022 function at once processing in the C front end. Currently these
7023 functions are not called from anywhere in the C front end, but as
7024 these changes continue, that will change. */
7026 /* Returns non-zero if the current statement is a full expression,
7027 i.e. temporaries created during that statement should be destroyed
7028 at the end of the statement. */
7031 stmts_are_full_exprs_p ()
7036 /* Returns the stmt_tree (if any) to which statements are currently
7037 being added. If there is no active statement-tree, NULL is
7041 current_stmt_tree ()
7043 return &c_stmt_tree;
7046 /* Returns the stack of SCOPE_STMTs for the current function. */
7049 current_scope_stmt_stack ()
7051 return &c_scope_stmt_stack;
7054 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
7058 anon_aggr_type_p (node)
7059 tree node ATTRIBUTE_UNUSED;
7064 /* Dummy function in place of callback used by C++. */
7067 extract_interface_info ()
7071 /* Return a new COMPOUND_STMT, after adding it to the current
7075 c_begin_compound_stmt ()
7079 /* Create the COMPOUND_STMT. */
7080 stmt = add_stmt (build_stmt (COMPOUND_STMT, NULL_TREE));
7081 /* If we haven't already declared __FUNCTION__ and its ilk then this
7082 is the opening curly brace of the function. Declare them now. */
7083 if (!c_function_name_declared_p)
7085 c_function_name_declared_p = 1;
7086 declare_function_name ();
7092 /* Expand T (a DECL_STMT) if it declares an entity not handled by the
7096 c_expand_decl_stmt (t)
7099 tree decl = DECL_STMT_DECL (t);
7101 /* Expand nested functions. */
7102 if (TREE_CODE (decl) == FUNCTION_DECL
7103 && DECL_CONTEXT (decl) == current_function_decl
7104 && DECL_SAVED_TREE (decl))
7105 c_expand_body (decl, /*nested_p=*/1);